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 int __ipv6_regen_rndid(struct inet6_dev *idev);
 131static int __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                ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 792                rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 793
 794                if (rt && addrconf_is_prefix_route(rt)) {
 795                        if (onlink == 0) {
 796                                ip6_del_rt(rt);
 797                                rt = NULL;
 798                        } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 799                                rt6_set_expires(rt, expires);
 800                        }
 801                }
 802                dst_release(&rt->dst);
 803        }
 804
 805        /* clean up prefsrc entries */
 806        rt6_remove_prefsrc(ifp);
 807out:
 808        in6_ifa_put(ifp);
 809}
 810
 811#ifdef CONFIG_IPV6_PRIVACY
 812static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 813{
 814        struct inet6_dev *idev = ifp->idev;
 815        struct in6_addr addr, *tmpaddr;
 816        unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
 817        unsigned long regen_advance;
 818        int tmp_plen;
 819        int ret = 0;
 820        int max_addresses;
 821        u32 addr_flags;
 822        unsigned long now = jiffies;
 823
 824        write_lock(&idev->lock);
 825        if (ift) {
 826                spin_lock_bh(&ift->lock);
 827                memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 828                spin_unlock_bh(&ift->lock);
 829                tmpaddr = &addr;
 830        } else {
 831                tmpaddr = NULL;
 832        }
 833retry:
 834        in6_dev_hold(idev);
 835        if (idev->cnf.use_tempaddr <= 0) {
 836                write_unlock(&idev->lock);
 837                pr_info("%s: use_tempaddr is disabled\n", __func__);
 838                in6_dev_put(idev);
 839                ret = -1;
 840                goto out;
 841        }
 842        spin_lock_bh(&ifp->lock);
 843        if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 844                idev->cnf.use_tempaddr = -1;    /*XXX*/
 845                spin_unlock_bh(&ifp->lock);
 846                write_unlock(&idev->lock);
 847                pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
 848                        __func__);
 849                in6_dev_put(idev);
 850                ret = -1;
 851                goto out;
 852        }
 853        in6_ifa_hold(ifp);
 854        memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 855        if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 856                spin_unlock_bh(&ifp->lock);
 857                write_unlock(&idev->lock);
 858                pr_warn("%s: regeneration of randomized interface id failed\n",
 859                        __func__);
 860                in6_ifa_put(ifp);
 861                in6_dev_put(idev);
 862                ret = -1;
 863                goto out;
 864        }
 865        memcpy(&addr.s6_addr[8], idev->rndid, 8);
 866        age = (now - ifp->tstamp) / HZ;
 867        tmp_valid_lft = min_t(__u32,
 868                              ifp->valid_lft,
 869                              idev->cnf.temp_valid_lft + age);
 870        tmp_prefered_lft = min_t(__u32,
 871                                 ifp->prefered_lft,
 872                                 idev->cnf.temp_prefered_lft + age -
 873                                 idev->cnf.max_desync_factor);
 874        tmp_plen = ifp->prefix_len;
 875        max_addresses = idev->cnf.max_addresses;
 876        tmp_tstamp = ifp->tstamp;
 877        spin_unlock_bh(&ifp->lock);
 878
 879        regen_advance = idev->cnf.regen_max_retry *
 880                        idev->cnf.dad_transmits *
 881                        idev->nd_parms->retrans_time / HZ;
 882        write_unlock(&idev->lock);
 883
 884        /* A temporary address is created only if this calculated Preferred
 885         * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 886         * an implementation must not create a temporary address with a zero
 887         * Preferred Lifetime.
 888         */
 889        if (tmp_prefered_lft <= regen_advance) {
 890                in6_ifa_put(ifp);
 891                in6_dev_put(idev);
 892                ret = -1;
 893                goto out;
 894        }
 895
 896        addr_flags = IFA_F_TEMPORARY;
 897        /* set in addrconf_prefix_rcv() */
 898        if (ifp->flags & IFA_F_OPTIMISTIC)
 899                addr_flags |= IFA_F_OPTIMISTIC;
 900
 901        ift = !max_addresses ||
 902              ipv6_count_addresses(idev) < max_addresses ?
 903                ipv6_add_addr(idev, &addr, tmp_plen,
 904                              ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 905                              addr_flags) : NULL;
 906        if (!ift || IS_ERR(ift)) {
 907                in6_ifa_put(ifp);
 908                in6_dev_put(idev);
 909                pr_info("%s: retry temporary address regeneration\n", __func__);
 910                tmpaddr = &addr;
 911                write_lock(&idev->lock);
 912                goto retry;
 913        }
 914
 915        spin_lock_bh(&ift->lock);
 916        ift->ifpub = ifp;
 917        ift->valid_lft = tmp_valid_lft;
 918        ift->prefered_lft = tmp_prefered_lft;
 919        ift->cstamp = now;
 920        ift->tstamp = tmp_tstamp;
 921        spin_unlock_bh(&ift->lock);
 922
 923        addrconf_dad_start(ift);
 924        in6_ifa_put(ift);
 925        in6_dev_put(idev);
 926out:
 927        return ret;
 928}
 929#endif
 930
 931/*
 932 *      Choose an appropriate source address (RFC3484)
 933 */
 934enum {
 935        IPV6_SADDR_RULE_INIT = 0,
 936        IPV6_SADDR_RULE_LOCAL,
 937        IPV6_SADDR_RULE_SCOPE,
 938        IPV6_SADDR_RULE_PREFERRED,
 939#ifdef CONFIG_IPV6_MIP6
 940        IPV6_SADDR_RULE_HOA,
 941#endif
 942        IPV6_SADDR_RULE_OIF,
 943        IPV6_SADDR_RULE_LABEL,
 944#ifdef CONFIG_IPV6_PRIVACY
 945        IPV6_SADDR_RULE_PRIVACY,
 946#endif
 947        IPV6_SADDR_RULE_ORCHID,
 948        IPV6_SADDR_RULE_PREFIX,
 949        IPV6_SADDR_RULE_MAX
 950};
 951
 952struct ipv6_saddr_score {
 953        int                     rule;
 954        int                     addr_type;
 955        struct inet6_ifaddr     *ifa;
 956        DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 957        int                     scopedist;
 958        int                     matchlen;
 959};
 960
 961struct ipv6_saddr_dst {
 962        const struct in6_addr *addr;
 963        int ifindex;
 964        int scope;
 965        int label;
 966        unsigned int prefs;
 967};
 968
 969static inline int ipv6_saddr_preferred(int type)
 970{
 971        if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
 972                return 1;
 973        return 0;
 974}
 975
 976static int ipv6_get_saddr_eval(struct net *net,
 977                               struct ipv6_saddr_score *score,
 978                               struct ipv6_saddr_dst *dst,
 979                               int i)
 980{
 981        int ret;
 982
 983        if (i <= score->rule) {
 984                switch (i) {
 985                case IPV6_SADDR_RULE_SCOPE:
 986                        ret = score->scopedist;
 987                        break;
 988                case IPV6_SADDR_RULE_PREFIX:
 989                        ret = score->matchlen;
 990                        break;
 991                default:
 992                        ret = !!test_bit(i, score->scorebits);
 993                }
 994                goto out;
 995        }
 996
 997        switch (i) {
 998        case IPV6_SADDR_RULE_INIT:
 999                /* Rule 0: remember if hiscore is not ready yet */
1000                ret = !!score->ifa;
1001                break;
1002        case IPV6_SADDR_RULE_LOCAL:
1003                /* Rule 1: Prefer same address */
1004                ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1005                break;
1006        case IPV6_SADDR_RULE_SCOPE:
1007                /* Rule 2: Prefer appropriate scope
1008                 *
1009                 *      ret
1010                 *       ^
1011                 *    -1 |  d 15
1012                 *    ---+--+-+---> scope
1013                 *       |
1014                 *       |             d is scope of the destination.
1015                 *  B-d  |  \
1016                 *       |   \      <- smaller scope is better if
1017                 *  B-15 |    \        if scope is enough for destinaion.
1018                 *       |             ret = B - scope (-1 <= scope >= d <= 15).
1019                 * d-C-1 | /
1020                 *       |/         <- greater is better
1021                 *   -C  /             if scope is not enough for destination.
1022                 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1023                 *
1024                 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1025                 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1026                 * Assume B = 0 and we get C > 29.
1027                 */
1028                ret = __ipv6_addr_src_scope(score->addr_type);
1029                if (ret >= dst->scope)
1030                        ret = -ret;
1031                else
1032                        ret -= 128;     /* 30 is enough */
1033                score->scopedist = ret;
1034                break;
1035        case IPV6_SADDR_RULE_PREFERRED:
1036                /* Rule 3: Avoid deprecated and optimistic addresses */
1037                ret = ipv6_saddr_preferred(score->addr_type) ||
1038                      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1039                break;
1040#ifdef CONFIG_IPV6_MIP6
1041        case IPV6_SADDR_RULE_HOA:
1042            {
1043                /* Rule 4: Prefer home address */
1044                int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1045                ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1046                break;
1047            }
1048#endif
1049        case IPV6_SADDR_RULE_OIF:
1050                /* Rule 5: Prefer outgoing interface */
1051                ret = (!dst->ifindex ||
1052                       dst->ifindex == score->ifa->idev->dev->ifindex);
1053                break;
1054        case IPV6_SADDR_RULE_LABEL:
1055                /* Rule 6: Prefer matching label */
1056                ret = ipv6_addr_label(net,
1057                                      &score->ifa->addr, score->addr_type,
1058                                      score->ifa->idev->dev->ifindex) == dst->label;
1059                break;
1060#ifdef CONFIG_IPV6_PRIVACY
1061        case IPV6_SADDR_RULE_PRIVACY:
1062            {
1063                /* Rule 7: Prefer public address
1064                 * Note: prefer temporary address if use_tempaddr >= 2
1065                 */
1066                int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1067                                !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1068                                score->ifa->idev->cnf.use_tempaddr >= 2;
1069                ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1070                break;
1071            }
1072#endif
1073        case IPV6_SADDR_RULE_ORCHID:
1074                /* Rule 8-: Prefer ORCHID vs ORCHID or
1075                 *          non-ORCHID vs non-ORCHID
1076                 */
1077                ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1078                        ipv6_addr_orchid(dst->addr));
1079                break;
1080        case IPV6_SADDR_RULE_PREFIX:
1081                /* Rule 8: Use longest matching prefix */
1082                score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1083                                                       dst->addr);
1084                break;
1085        default:
1086                ret = 0;
1087        }
1088
1089        if (ret)
1090                __set_bit(i, score->scorebits);
1091        score->rule = i;
1092out:
1093        return ret;
1094}
1095
1096int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1097                       const struct in6_addr *daddr, unsigned int prefs,
1098                       struct in6_addr *saddr)
1099{
1100        struct ipv6_saddr_score scores[2],
1101                                *score = &scores[0], *hiscore = &scores[1];
1102        struct ipv6_saddr_dst dst;
1103        struct net_device *dev;
1104        int dst_type;
1105
1106        dst_type = __ipv6_addr_type(daddr);
1107        dst.addr = daddr;
1108        dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1109        dst.scope = __ipv6_addr_src_scope(dst_type);
1110        dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1111        dst.prefs = prefs;
1112
1113        hiscore->rule = -1;
1114        hiscore->ifa = NULL;
1115
1116        rcu_read_lock();
1117
1118        for_each_netdev_rcu(net, dev) {
1119                struct inet6_dev *idev;
1120
1121                /* Candidate Source Address (section 4)
1122                 *  - multicast and link-local destination address,
1123                 *    the set of candidate source address MUST only
1124                 *    include addresses assigned to interfaces
1125                 *    belonging to the same link as the outgoing
1126                 *    interface.
1127                 * (- For site-local destination addresses, the
1128                 *    set of candidate source addresses MUST only
1129                 *    include addresses assigned to interfaces
1130                 *    belonging to the same site as the outgoing
1131                 *    interface.)
1132                 */
1133                if (((dst_type & IPV6_ADDR_MULTICAST) ||
1134                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1135                    dst.ifindex && dev->ifindex != dst.ifindex)
1136                        continue;
1137
1138                idev = __in6_dev_get(dev);
1139                if (!idev)
1140                        continue;
1141
1142                read_lock_bh(&idev->lock);
1143                list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1144                        int i;
1145
1146                        /*
1147                         * - Tentative Address (RFC2462 section 5.4)
1148                         *  - A tentative address is not considered
1149                         *    "assigned to an interface" in the traditional
1150                         *    sense, unless it is also flagged as optimistic.
1151                         * - Candidate Source Address (section 4)
1152                         *  - In any case, anycast addresses, multicast
1153                         *    addresses, and the unspecified address MUST
1154                         *    NOT be included in a candidate set.
1155                         */
1156                        if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1157                            (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1158                                continue;
1159
1160                        score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1161
1162                        if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1163                                     score->addr_type & IPV6_ADDR_MULTICAST)) {
1164                                LIMIT_NETDEBUG(KERN_DEBUG
1165                                               "ADDRCONF: unspecified / multicast address "
1166                                               "assigned as unicast address on %s",
1167                                               dev->name);
1168                                continue;
1169                        }
1170
1171                        score->rule = -1;
1172                        bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1173
1174                        for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1175                                int minihiscore, miniscore;
1176
1177                                minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1178                                miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1179
1180                                if (minihiscore > miniscore) {
1181                                        if (i == IPV6_SADDR_RULE_SCOPE &&
1182                                            score->scopedist > 0) {
1183                                                /*
1184                                                 * special case:
1185                                                 * each remaining entry
1186                                                 * has too small (not enough)
1187                                                 * scope, because ifa entries
1188                                                 * are sorted by their scope
1189                                                 * values.
1190                                                 */
1191                                                goto try_nextdev;
1192                                        }
1193                                        break;
1194                                } else if (minihiscore < miniscore) {
1195                                        if (hiscore->ifa)
1196                                                in6_ifa_put(hiscore->ifa);
1197
1198                                        in6_ifa_hold(score->ifa);
1199
1200                                        swap(hiscore, score);
1201
1202                                        /* restore our iterator */
1203                                        score->ifa = hiscore->ifa;
1204
1205                                        break;
1206                                }
1207                        }
1208                }
1209try_nextdev:
1210                read_unlock_bh(&idev->lock);
1211        }
1212        rcu_read_unlock();
1213
1214        if (!hiscore->ifa)
1215                return -EADDRNOTAVAIL;
1216
1217        *saddr = hiscore->ifa->addr;
1218        in6_ifa_put(hiscore->ifa);
1219        return 0;
1220}
1221EXPORT_SYMBOL(ipv6_dev_get_saddr);
1222
1223int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1224                    unsigned char banned_flags)
1225{
1226        struct inet6_dev *idev;
1227        int err = -EADDRNOTAVAIL;
1228
1229        rcu_read_lock();
1230        idev = __in6_dev_get(dev);
1231        if (idev) {
1232                struct inet6_ifaddr *ifp;
1233
1234                read_lock_bh(&idev->lock);
1235                list_for_each_entry(ifp, &idev->addr_list, if_list) {
1236                        if (ifp->scope == IFA_LINK &&
1237                            !(ifp->flags & banned_flags)) {
1238                                *addr = ifp->addr;
1239                                err = 0;
1240                                break;
1241                        }
1242                }
1243                read_unlock_bh(&idev->lock);
1244        }
1245        rcu_read_unlock();
1246        return err;
1247}
1248
1249static int ipv6_count_addresses(struct inet6_dev *idev)
1250{
1251        int cnt = 0;
1252        struct inet6_ifaddr *ifp;
1253
1254        read_lock_bh(&idev->lock);
1255        list_for_each_entry(ifp, &idev->addr_list, if_list)
1256                cnt++;
1257        read_unlock_bh(&idev->lock);
1258        return cnt;
1259}
1260
1261int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1262                  struct net_device *dev, int strict)
1263{
1264        struct inet6_ifaddr *ifp;
1265        struct hlist_node *node;
1266        unsigned int hash = inet6_addr_hash(addr);
1267
1268        rcu_read_lock_bh();
1269        hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1270                if (!net_eq(dev_net(ifp->idev->dev), net))
1271                        continue;
1272                if (ipv6_addr_equal(&ifp->addr, addr) &&
1273                    !(ifp->flags&IFA_F_TENTATIVE) &&
1274                    (dev == NULL || ifp->idev->dev == dev ||
1275                     !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1276                        rcu_read_unlock_bh();
1277                        return 1;
1278                }
1279        }
1280
1281        rcu_read_unlock_bh();
1282        return 0;
1283}
1284EXPORT_SYMBOL(ipv6_chk_addr);
1285
1286static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1287                               struct net_device *dev)
1288{
1289        unsigned int hash = inet6_addr_hash(addr);
1290        struct inet6_ifaddr *ifp;
1291        struct hlist_node *node;
1292
1293        hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1294                if (!net_eq(dev_net(ifp->idev->dev), net))
1295                        continue;
1296                if (ipv6_addr_equal(&ifp->addr, addr)) {
1297                        if (dev == NULL || ifp->idev->dev == dev)
1298                                return true;
1299                }
1300        }
1301        return false;
1302}
1303
1304int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1305{
1306        struct inet6_dev *idev;
1307        struct inet6_ifaddr *ifa;
1308        int     onlink;
1309
1310        onlink = 0;
1311        rcu_read_lock();
1312        idev = __in6_dev_get(dev);
1313        if (idev) {
1314                read_lock_bh(&idev->lock);
1315                list_for_each_entry(ifa, &idev->addr_list, if_list) {
1316                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
1317                                                   ifa->prefix_len);
1318                        if (onlink)
1319                                break;
1320                }
1321                read_unlock_bh(&idev->lock);
1322        }
1323        rcu_read_unlock();
1324        return onlink;
1325}
1326EXPORT_SYMBOL(ipv6_chk_prefix);
1327
1328struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1329                                     struct net_device *dev, int strict)
1330{
1331        struct inet6_ifaddr *ifp, *result = NULL;
1332        unsigned int hash = inet6_addr_hash(addr);
1333        struct hlist_node *node;
1334
1335        rcu_read_lock_bh();
1336        hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1337                if (!net_eq(dev_net(ifp->idev->dev), net))
1338                        continue;
1339                if (ipv6_addr_equal(&ifp->addr, addr)) {
1340                        if (dev == NULL || ifp->idev->dev == dev ||
1341                            !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1342                                result = ifp;
1343                                in6_ifa_hold(ifp);
1344                                break;
1345                        }
1346                }
1347        }
1348        rcu_read_unlock_bh();
1349
1350        return result;
1351}
1352
1353/* Gets referenced address, destroys ifaddr */
1354
1355static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1356{
1357        if (ifp->flags&IFA_F_PERMANENT) {
1358                spin_lock_bh(&ifp->lock);
1359                addrconf_del_timer(ifp);
1360                ifp->flags |= IFA_F_TENTATIVE;
1361                if (dad_failed)
1362                        ifp->flags |= IFA_F_DADFAILED;
1363                spin_unlock_bh(&ifp->lock);
1364                if (dad_failed)
1365                        ipv6_ifa_notify(0, ifp);
1366                in6_ifa_put(ifp);
1367#ifdef CONFIG_IPV6_PRIVACY
1368        } else if (ifp->flags&IFA_F_TEMPORARY) {
1369                struct inet6_ifaddr *ifpub;
1370                spin_lock_bh(&ifp->lock);
1371                ifpub = ifp->ifpub;
1372                if (ifpub) {
1373                        in6_ifa_hold(ifpub);
1374                        spin_unlock_bh(&ifp->lock);
1375                        ipv6_create_tempaddr(ifpub, ifp);
1376                        in6_ifa_put(ifpub);
1377                } else {
1378                        spin_unlock_bh(&ifp->lock);
1379                }
1380                ipv6_del_addr(ifp);
1381#endif
1382        } else
1383                ipv6_del_addr(ifp);
1384}
1385
1386static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1387{
1388        int err = -ENOENT;
1389
1390        spin_lock(&ifp->state_lock);
1391        if (ifp->state == INET6_IFADDR_STATE_DAD) {
1392                ifp->state = INET6_IFADDR_STATE_POSTDAD;
1393                err = 0;
1394        }
1395        spin_unlock(&ifp->state_lock);
1396
1397        return err;
1398}
1399
1400void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1401{
1402        struct inet6_dev *idev = ifp->idev;
1403
1404        if (addrconf_dad_end(ifp)) {
1405                in6_ifa_put(ifp);
1406                return;
1407        }
1408
1409        net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1410                             ifp->idev->dev->name, &ifp->addr);
1411
1412        if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1413                struct in6_addr addr;
1414
1415                addr.s6_addr32[0] = htonl(0xfe800000);
1416                addr.s6_addr32[1] = 0;
1417
1418                if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1419                    ipv6_addr_equal(&ifp->addr, &addr)) {
1420                        /* DAD failed for link-local based on MAC address */
1421                        idev->cnf.disable_ipv6 = 1;
1422
1423                        pr_info("%s: IPv6 being disabled!\n",
1424                                ifp->idev->dev->name);
1425                }
1426        }
1427
1428        addrconf_dad_stop(ifp, 1);
1429}
1430
1431/* Join to solicited addr multicast group. */
1432
1433void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1434{
1435        struct in6_addr maddr;
1436
1437        if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1438                return;
1439
1440        addrconf_addr_solict_mult(addr, &maddr);
1441        ipv6_dev_mc_inc(dev, &maddr);
1442}
1443
1444void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1445{
1446        struct in6_addr maddr;
1447
1448        if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1449                return;
1450
1451        addrconf_addr_solict_mult(addr, &maddr);
1452        __ipv6_dev_mc_dec(idev, &maddr);
1453}
1454
1455static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1456{
1457        struct in6_addr addr;
1458        if (ifp->prefix_len == 127) /* RFC 6164 */
1459                return;
1460        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1461        if (ipv6_addr_any(&addr))
1462                return;
1463        ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1464}
1465
1466static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1467{
1468        struct in6_addr addr;
1469        if (ifp->prefix_len == 127) /* RFC 6164 */
1470                return;
1471        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1472        if (ipv6_addr_any(&addr))
1473                return;
1474        __ipv6_dev_ac_dec(ifp->idev, &addr);
1475}
1476
1477static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1478{
1479        if (dev->addr_len != ETH_ALEN)
1480                return -1;
1481        memcpy(eui, dev->dev_addr, 3);
1482        memcpy(eui + 5, dev->dev_addr + 3, 3);
1483
1484        /*
1485         * The zSeries OSA network cards can be shared among various
1486         * OS instances, but the OSA cards have only one MAC address.
1487         * This leads to duplicate address conflicts in conjunction
1488         * with IPv6 if more than one instance uses the same card.
1489         *
1490         * The driver for these cards can deliver a unique 16-bit
1491         * identifier for each instance sharing the same card.  It is
1492         * placed instead of 0xFFFE in the interface identifier.  The
1493         * "u" bit of the interface identifier is not inverted in this
1494         * case.  Hence the resulting interface identifier has local
1495         * scope according to RFC2373.
1496         */
1497        if (dev->dev_id) {
1498                eui[3] = (dev->dev_id >> 8) & 0xFF;
1499                eui[4] = dev->dev_id & 0xFF;
1500        } else {
1501                eui[3] = 0xFF;
1502                eui[4] = 0xFE;
1503                eui[0] ^= 2;
1504        }
1505        return 0;
1506}
1507
1508static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1509{
1510        if (dev->addr_len != IEEE802154_ADDR_LEN)
1511                return -1;
1512        memcpy(eui, dev->dev_addr, 8);
1513        return 0;
1514}
1515
1516static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1517{
1518        /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1519        if (dev->addr_len != ARCNET_ALEN)
1520                return -1;
1521        memset(eui, 0, 7);
1522        eui[7] = *(u8 *)dev->dev_addr;
1523        return 0;
1524}
1525
1526static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1527{
1528        if (dev->addr_len != INFINIBAND_ALEN)
1529                return -1;
1530        memcpy(eui, dev->dev_addr + 12, 8);
1531        eui[0] |= 2;
1532        return 0;
1533}
1534
1535static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1536{
1537        if (addr == 0)
1538                return -1;
1539        eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1540                  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1541                  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1542                  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1543                  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1544                  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1545        eui[1] = 0;
1546        eui[2] = 0x5E;
1547        eui[3] = 0xFE;
1548        memcpy(eui + 4, &addr, 4);
1549        return 0;
1550}
1551
1552static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1553{
1554        if (dev->priv_flags & IFF_ISATAP)
1555                return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1556        return -1;
1557}
1558
1559static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1560{
1561        return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1562}
1563
1564static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1565{
1566        switch (dev->type) {
1567        case ARPHRD_ETHER:
1568        case ARPHRD_FDDI:
1569                return addrconf_ifid_eui48(eui, dev);
1570        case ARPHRD_ARCNET:
1571                return addrconf_ifid_arcnet(eui, dev);
1572        case ARPHRD_INFINIBAND:
1573                return addrconf_ifid_infiniband(eui, dev);
1574        case ARPHRD_SIT:
1575                return addrconf_ifid_sit(eui, dev);
1576        case ARPHRD_IPGRE:
1577                return addrconf_ifid_gre(eui, dev);
1578        case ARPHRD_IEEE802154:
1579                return addrconf_ifid_eui64(eui, dev);
1580        }
1581        return -1;
1582}
1583
1584static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1585{
1586        int err = -1;
1587        struct inet6_ifaddr *ifp;
1588
1589        read_lock_bh(&idev->lock);
1590        list_for_each_entry(ifp, &idev->addr_list, if_list) {
1591                if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1592                        memcpy(eui, ifp->addr.s6_addr+8, 8);
1593                        err = 0;
1594                        break;
1595                }
1596        }
1597        read_unlock_bh(&idev->lock);
1598        return err;
1599}
1600
1601#ifdef CONFIG_IPV6_PRIVACY
1602/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1603static int __ipv6_regen_rndid(struct inet6_dev *idev)
1604{
1605regen:
1606        get_random_bytes(idev->rndid, sizeof(idev->rndid));
1607        idev->rndid[0] &= ~0x02;
1608
1609        /*
1610         * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1611         * check if generated address is not inappropriate
1612         *
1613         *  - Reserved subnet anycast (RFC 2526)
1614         *      11111101 11....11 1xxxxxxx
1615         *  - ISATAP (RFC4214) 6.1
1616         *      00-00-5E-FE-xx-xx-xx-xx
1617         *  - value 0
1618         *  - XXX: already assigned to an address on the device
1619         */
1620        if (idev->rndid[0] == 0xfd &&
1621            (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1622            (idev->rndid[7]&0x80))
1623                goto regen;
1624        if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1625                if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1626                        goto regen;
1627                if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1628                        goto regen;
1629        }
1630
1631        return 0;
1632}
1633
1634static void ipv6_regen_rndid(unsigned long data)
1635{
1636        struct inet6_dev *idev = (struct inet6_dev *) data;
1637        unsigned long expires;
1638
1639        rcu_read_lock_bh();
1640        write_lock_bh(&idev->lock);
1641
1642        if (idev->dead)
1643                goto out;
1644
1645        if (__ipv6_regen_rndid(idev) < 0)
1646                goto out;
1647
1648        expires = jiffies +
1649                idev->cnf.temp_prefered_lft * HZ -
1650                idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1651                idev->cnf.max_desync_factor * HZ;
1652        if (time_before(expires, jiffies)) {
1653                pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1654                        __func__, idev->dev->name);
1655                goto out;
1656        }
1657
1658        if (!mod_timer(&idev->regen_timer, expires))
1659                in6_dev_hold(idev);
1660
1661out:
1662        write_unlock_bh(&idev->lock);
1663        rcu_read_unlock_bh();
1664        in6_dev_put(idev);
1665}
1666
1667static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1668{
1669        int ret = 0;
1670
1671        if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1672                ret = __ipv6_regen_rndid(idev);
1673        return ret;
1674}
1675#endif
1676
1677/*
1678 *      Add prefix route.
1679 */
1680
1681static void
1682addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1683                      unsigned long expires, u32 flags)
1684{
1685        struct fib6_config cfg = {
1686                .fc_table = RT6_TABLE_PREFIX,
1687                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1688                .fc_ifindex = dev->ifindex,
1689                .fc_expires = expires,
1690                .fc_dst_len = plen,
1691                .fc_flags = RTF_UP | flags,
1692                .fc_nlinfo.nl_net = dev_net(dev),
1693                .fc_protocol = RTPROT_KERNEL,
1694        };
1695
1696        cfg.fc_dst = *pfx;
1697
1698        /* Prevent useless cloning on PtP SIT.
1699           This thing is done here expecting that the whole
1700           class of non-broadcast devices need not cloning.
1701         */
1702#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1703        if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1704                cfg.fc_flags |= RTF_NONEXTHOP;
1705#endif
1706
1707        ip6_route_add(&cfg);
1708}
1709
1710
1711static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1712                                                  int plen,
1713                                                  const struct net_device *dev,
1714                                                  u32 flags, u32 noflags)
1715{
1716        struct fib6_node *fn;
1717        struct rt6_info *rt = NULL;
1718        struct fib6_table *table;
1719
1720        table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1721        if (table == NULL)
1722                return NULL;
1723
1724        write_lock_bh(&table->tb6_lock);
1725        fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1726        if (!fn)
1727                goto out;
1728        for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1729                if (rt->dst.dev->ifindex != dev->ifindex)
1730                        continue;
1731                if ((rt->rt6i_flags & flags) != flags)
1732                        continue;
1733                if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1734                        continue;
1735                dst_hold(&rt->dst);
1736                break;
1737        }
1738out:
1739        write_unlock_bh(&table->tb6_lock);
1740        return rt;
1741}
1742
1743
1744/* Create "default" multicast route to the interface */
1745
1746static void addrconf_add_mroute(struct net_device *dev)
1747{
1748        struct fib6_config cfg = {
1749                .fc_table = RT6_TABLE_LOCAL,
1750                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1751                .fc_ifindex = dev->ifindex,
1752                .fc_dst_len = 8,
1753                .fc_flags = RTF_UP,
1754                .fc_nlinfo.nl_net = dev_net(dev),
1755        };
1756
1757        ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1758
1759        ip6_route_add(&cfg);
1760}
1761
1762#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1763static void sit_route_add(struct net_device *dev)
1764{
1765        struct fib6_config cfg = {
1766                .fc_table = RT6_TABLE_MAIN,
1767                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1768                .fc_ifindex = dev->ifindex,
1769                .fc_dst_len = 96,
1770                .fc_flags = RTF_UP | RTF_NONEXTHOP,
1771                .fc_nlinfo.nl_net = dev_net(dev),
1772        };
1773
1774        /* prefix length - 96 bits "::d.d.d.d" */
1775        ip6_route_add(&cfg);
1776}
1777#endif
1778
1779static void addrconf_add_lroute(struct net_device *dev)
1780{
1781        struct in6_addr addr;
1782
1783        ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1784        addrconf_prefix_route(&addr, 64, dev, 0, 0);
1785}
1786
1787static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1788{
1789        struct inet6_dev *idev;
1790
1791        ASSERT_RTNL();
1792
1793        idev = ipv6_find_idev(dev);
1794        if (!idev)
1795                return ERR_PTR(-ENOBUFS);
1796
1797        if (idev->cnf.disable_ipv6)
1798                return ERR_PTR(-EACCES);
1799
1800        /* Add default multicast route */
1801        if (!(dev->flags & IFF_LOOPBACK))
1802                addrconf_add_mroute(dev);
1803
1804        /* Add link local route */
1805        addrconf_add_lroute(dev);
1806        return idev;
1807}
1808
1809void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1810{
1811        struct prefix_info *pinfo;
1812        __u32 valid_lft;
1813        __u32 prefered_lft;
1814        int addr_type;
1815        struct inet6_dev *in6_dev;
1816        struct net *net = dev_net(dev);
1817
1818        pinfo = (struct prefix_info *) opt;
1819
1820        if (len < sizeof(struct prefix_info)) {
1821                ADBG(("addrconf: prefix option too short\n"));
1822                return;
1823        }
1824
1825        /*
1826         *      Validation checks ([ADDRCONF], page 19)
1827         */
1828
1829        addr_type = ipv6_addr_type(&pinfo->prefix);
1830
1831        if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1832                return;
1833
1834        valid_lft = ntohl(pinfo->valid);
1835        prefered_lft = ntohl(pinfo->prefered);
1836
1837        if (prefered_lft > valid_lft) {
1838                net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1839                return;
1840        }
1841
1842        in6_dev = in6_dev_get(dev);
1843
1844        if (in6_dev == NULL) {
1845                net_dbg_ratelimited("addrconf: device %s not configured\n",
1846                                    dev->name);
1847                return;
1848        }
1849
1850        /*
1851         *      Two things going on here:
1852         *      1) Add routes for on-link prefixes
1853         *      2) Configure prefixes with the auto flag set
1854         */
1855
1856        if (pinfo->onlink) {
1857                struct rt6_info *rt;
1858                unsigned long rt_expires;
1859
1860                /* Avoid arithmetic overflow. Really, we could
1861                 * save rt_expires in seconds, likely valid_lft,
1862                 * but it would require division in fib gc, that it
1863                 * not good.
1864                 */
1865                if (HZ > USER_HZ)
1866                        rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1867                else
1868                        rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1869
1870                if (addrconf_finite_timeout(rt_expires))
1871                        rt_expires *= HZ;
1872
1873                rt = addrconf_get_prefix_route(&pinfo->prefix,
1874                                               pinfo->prefix_len,
1875                                               dev,
1876                                               RTF_ADDRCONF | RTF_PREFIX_RT,
1877                                               RTF_GATEWAY | RTF_DEFAULT);
1878
1879                if (rt) {
1880                        /* Autoconf prefix route */
1881                        if (valid_lft == 0) {
1882                                ip6_del_rt(rt);
1883                                rt = NULL;
1884                        } else if (addrconf_finite_timeout(rt_expires)) {
1885                                /* not infinity */
1886                                rt6_set_expires(rt, jiffies + rt_expires);
1887                        } else {
1888                                rt6_clean_expires(rt);
1889                        }
1890                } else if (valid_lft) {
1891                        clock_t expires = 0;
1892                        int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1893                        if (addrconf_finite_timeout(rt_expires)) {
1894                                /* not infinity */
1895                                flags |= RTF_EXPIRES;
1896                                expires = jiffies_to_clock_t(rt_expires);
1897                        }
1898                        addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1899                                              dev, expires, flags);
1900                }
1901                if (rt)
1902                        dst_release(&rt->dst);
1903        }
1904
1905        /* Try to figure out our local address for this prefix */
1906
1907        if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1908                struct inet6_ifaddr *ifp;
1909                struct in6_addr addr;
1910                int create = 0, update_lft = 0;
1911
1912                if (pinfo->prefix_len == 64) {
1913                        memcpy(&addr, &pinfo->prefix, 8);
1914                        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1915                            ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1916                                in6_dev_put(in6_dev);
1917                                return;
1918                        }
1919                        goto ok;
1920                }
1921                net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1922                                    pinfo->prefix_len);
1923                in6_dev_put(in6_dev);
1924                return;
1925
1926ok:
1927
1928                ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1929
1930                if (ifp == NULL && valid_lft) {
1931                        int max_addresses = in6_dev->cnf.max_addresses;
1932                        u32 addr_flags = 0;
1933
1934#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1935                        if (in6_dev->cnf.optimistic_dad &&
1936                            !net->ipv6.devconf_all->forwarding && sllao)
1937                                addr_flags = IFA_F_OPTIMISTIC;
1938#endif
1939
1940                        /* Do not allow to create too much of autoconfigured
1941                         * addresses; this would be too easy way to crash kernel.
1942                         */
1943                        if (!max_addresses ||
1944                            ipv6_count_addresses(in6_dev) < max_addresses)
1945                                ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1946                                                    addr_type&IPV6_ADDR_SCOPE_MASK,
1947                                                    addr_flags);
1948
1949                        if (!ifp || IS_ERR(ifp)) {
1950                                in6_dev_put(in6_dev);
1951                                return;
1952                        }
1953
1954                        update_lft = create = 1;
1955                        ifp->cstamp = jiffies;
1956                        addrconf_dad_start(ifp);
1957                }
1958
1959                if (ifp) {
1960                        int flags;
1961                        unsigned long now;
1962#ifdef CONFIG_IPV6_PRIVACY
1963                        struct inet6_ifaddr *ift;
1964#endif
1965                        u32 stored_lft;
1966
1967                        /* update lifetime (RFC2462 5.5.3 e) */
1968                        spin_lock(&ifp->lock);
1969                        now = jiffies;
1970                        if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1971                                stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1972                        else
1973                                stored_lft = 0;
1974                        if (!update_lft && stored_lft) {
1975                                if (valid_lft > MIN_VALID_LIFETIME ||
1976                                    valid_lft > stored_lft)
1977                                        update_lft = 1;
1978                                else if (stored_lft <= MIN_VALID_LIFETIME) {
1979                                        /* valid_lft <= stored_lft is always true */
1980                                        /*
1981                                         * RFC 4862 Section 5.5.3e:
1982                                         * "Note that the preferred lifetime of
1983                                         *  the corresponding address is always
1984                                         *  reset to the Preferred Lifetime in
1985                                         *  the received Prefix Information
1986                                         *  option, regardless of whether the
1987                                         *  valid lifetime is also reset or
1988                                         *  ignored."
1989                                         *
1990                                         *  So if the preferred lifetime in
1991                                         *  this advertisement is different
1992                                         *  than what we have stored, but the
1993                                         *  valid lifetime is invalid, just
1994                                         *  reset prefered_lft.
1995                                         *
1996                                         *  We must set the valid lifetime
1997                                         *  to the stored lifetime since we'll
1998                                         *  be updating the timestamp below,
1999                                         *  else we'll set it back to the
2000                                         *  minimum.
2001                                         */
2002                                        if (prefered_lft != ifp->prefered_lft) {
2003                                                valid_lft = stored_lft;
2004                                                update_lft = 1;
2005                                        }
2006                                } else {
2007                                        valid_lft = MIN_VALID_LIFETIME;
2008                                        if (valid_lft < prefered_lft)
2009                                                prefered_lft = valid_lft;
2010                                        update_lft = 1;
2011                                }
2012                        }
2013
2014                        if (update_lft) {
2015                                ifp->valid_lft = valid_lft;
2016                                ifp->prefered_lft = prefered_lft;
2017                                ifp->tstamp = now;
2018                                flags = ifp->flags;
2019                                ifp->flags &= ~IFA_F_DEPRECATED;
2020                                spin_unlock(&ifp->lock);
2021
2022                                if (!(flags&IFA_F_TENTATIVE))
2023                                        ipv6_ifa_notify(0, ifp);
2024                        } else
2025                                spin_unlock(&ifp->lock);
2026
2027#ifdef CONFIG_IPV6_PRIVACY
2028                        read_lock_bh(&in6_dev->lock);
2029                        /* update all temporary addresses in the list */
2030                        list_for_each_entry(ift, &in6_dev->tempaddr_list,
2031                                            tmp_list) {
2032                                int age, max_valid, max_prefered;
2033
2034                                if (ifp != ift->ifpub)
2035                                        continue;
2036
2037                                /*
2038                                 * RFC 4941 section 3.3:
2039                                 * If a received option will extend the lifetime
2040                                 * of a public address, the lifetimes of
2041                                 * temporary addresses should be extended,
2042                                 * subject to the overall constraint that no
2043                                 * temporary addresses should ever remain
2044                                 * "valid" or "preferred" for a time longer than
2045                                 * (TEMP_VALID_LIFETIME) or
2046                                 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2047                                 * respectively.
2048                                 */
2049                                age = (now - ift->cstamp) / HZ;
2050                                max_valid = in6_dev->cnf.temp_valid_lft - age;
2051                                if (max_valid < 0)
2052                                        max_valid = 0;
2053
2054                                max_prefered = in6_dev->cnf.temp_prefered_lft -
2055                                               in6_dev->cnf.max_desync_factor -
2056                                               age;
2057                                if (max_prefered < 0)
2058                                        max_prefered = 0;
2059
2060                                if (valid_lft > max_valid)
2061                                        valid_lft = max_valid;
2062
2063                                if (prefered_lft > max_prefered)
2064                                        prefered_lft = max_prefered;
2065
2066                                spin_lock(&ift->lock);
2067                                flags = ift->flags;
2068                                ift->valid_lft = valid_lft;
2069                                ift->prefered_lft = prefered_lft;
2070                                ift->tstamp = now;
2071                                if (prefered_lft > 0)
2072                                        ift->flags &= ~IFA_F_DEPRECATED;
2073
2074                                spin_unlock(&ift->lock);
2075                                if (!(flags&IFA_F_TENTATIVE))
2076                                        ipv6_ifa_notify(0, ift);
2077                        }
2078
2079                        if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2080                                /*
2081                                 * When a new public address is created as
2082                                 * described in [ADDRCONF], also create a new
2083                                 * temporary address. Also create a temporary
2084                                 * address if it's enabled but no temporary
2085                                 * address currently exists.
2086                                 */
2087                                read_unlock_bh(&in6_dev->lock);
2088                                ipv6_create_tempaddr(ifp, NULL);
2089                        } else {
2090                                read_unlock_bh(&in6_dev->lock);
2091                        }
2092#endif
2093                        in6_ifa_put(ifp);
2094                        addrconf_verify(0);
2095                }
2096        }
2097        inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2098        in6_dev_put(in6_dev);
2099}
2100
2101/*
2102 *      Set destination address.
2103 *      Special case for SIT interfaces where we create a new "virtual"
2104 *      device.
2105 */
2106int addrconf_set_dstaddr(struct net *net, void __user *arg)
2107{
2108        struct in6_ifreq ireq;
2109        struct net_device *dev;
2110        int err = -EINVAL;
2111
2112        rtnl_lock();
2113
2114        err = -EFAULT;
2115        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2116                goto err_exit;
2117
2118        dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2119
2120        err = -ENODEV;
2121        if (dev == NULL)
2122                goto err_exit;
2123
2124#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2125        if (dev->type == ARPHRD_SIT) {
2126                const struct net_device_ops *ops = dev->netdev_ops;
2127                struct ifreq ifr;
2128                struct ip_tunnel_parm p;
2129
2130                err = -EADDRNOTAVAIL;
2131                if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2132                        goto err_exit;
2133
2134                memset(&p, 0, sizeof(p));
2135                p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2136                p.iph.saddr = 0;
2137                p.iph.version = 4;
2138                p.iph.ihl = 5;
2139                p.iph.protocol = IPPROTO_IPV6;
2140                p.iph.ttl = 64;
2141                ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2142
2143                if (ops->ndo_do_ioctl) {
2144                        mm_segment_t oldfs = get_fs();
2145
2146                        set_fs(KERNEL_DS);
2147                        err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2148                        set_fs(oldfs);
2149                } else
2150                        err = -EOPNOTSUPP;
2151
2152                if (err == 0) {
2153                        err = -ENOBUFS;
2154                        dev = __dev_get_by_name(net, p.name);
2155                        if (!dev)
2156                                goto err_exit;
2157                        err = dev_open(dev);
2158                }
2159        }
2160#endif
2161
2162err_exit:
2163        rtnl_unlock();
2164        return err;
2165}
2166
2167/*
2168 *      Manual configuration of address on an interface
2169 */
2170static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2171                          unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2172                          __u32 valid_lft)
2173{
2174        struct inet6_ifaddr *ifp;
2175        struct inet6_dev *idev;
2176        struct net_device *dev;
2177        int scope;
2178        u32 flags;
2179        clock_t expires;
2180        unsigned long timeout;
2181
2182        ASSERT_RTNL();
2183
2184        if (plen > 128)
2185                return -EINVAL;
2186
2187        /* check the lifetime */
2188        if (!valid_lft || prefered_lft > valid_lft)
2189                return -EINVAL;
2190
2191        dev = __dev_get_by_index(net, ifindex);
2192        if (!dev)
2193                return -ENODEV;
2194
2195        idev = addrconf_add_dev(dev);
2196        if (IS_ERR(idev))
2197                return PTR_ERR(idev);
2198
2199        scope = ipv6_addr_scope(pfx);
2200
2201        timeout = addrconf_timeout_fixup(valid_lft, HZ);
2202        if (addrconf_finite_timeout(timeout)) {
2203                expires = jiffies_to_clock_t(timeout * HZ);
2204                valid_lft = timeout;
2205                flags = RTF_EXPIRES;
2206        } else {
2207                expires = 0;
2208                flags = 0;
2209                ifa_flags |= IFA_F_PERMANENT;
2210        }
2211
2212        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2213        if (addrconf_finite_timeout(timeout)) {
2214                if (timeout == 0)
2215                        ifa_flags |= IFA_F_DEPRECATED;
2216                prefered_lft = timeout;
2217        }
2218
2219        ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2220
2221        if (!IS_ERR(ifp)) {
2222                spin_lock_bh(&ifp->lock);
2223                ifp->valid_lft = valid_lft;
2224                ifp->prefered_lft = prefered_lft;
2225                ifp->tstamp = jiffies;
2226                spin_unlock_bh(&ifp->lock);
2227
2228                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2229                                      expires, flags);
2230                /*
2231                 * Note that section 3.1 of RFC 4429 indicates
2232                 * that the Optimistic flag should not be set for
2233                 * manually configured addresses
2234                 */
2235                addrconf_dad_start(ifp);
2236                in6_ifa_put(ifp);
2237                addrconf_verify(0);
2238                return 0;
2239        }
2240
2241        return PTR_ERR(ifp);
2242}
2243
2244static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2245                          unsigned int plen)
2246{
2247        struct inet6_ifaddr *ifp;
2248        struct inet6_dev *idev;
2249        struct net_device *dev;
2250
2251        if (plen > 128)
2252                return -EINVAL;
2253
2254        dev = __dev_get_by_index(net, ifindex);
2255        if (!dev)
2256                return -ENODEV;
2257
2258        if ((idev = __in6_dev_get(dev)) == NULL)
2259                return -ENXIO;
2260
2261        read_lock_bh(&idev->lock);
2262        list_for_each_entry(ifp, &idev->addr_list, if_list) {
2263                if (ifp->prefix_len == plen &&
2264                    ipv6_addr_equal(pfx, &ifp->addr)) {
2265                        in6_ifa_hold(ifp);
2266                        read_unlock_bh(&idev->lock);
2267
2268                        ipv6_del_addr(ifp);
2269
2270                        /* If the last address is deleted administratively,
2271                           disable IPv6 on this interface.
2272                         */
2273                        if (list_empty(&idev->addr_list))
2274                                addrconf_ifdown(idev->dev, 1);
2275                        return 0;
2276                }
2277        }
2278        read_unlock_bh(&idev->lock);
2279        return -EADDRNOTAVAIL;
2280}
2281
2282
2283int addrconf_add_ifaddr(struct net *net, void __user *arg)
2284{
2285        struct in6_ifreq ireq;
2286        int err;
2287
2288        if (!capable(CAP_NET_ADMIN))
2289                return -EPERM;
2290
2291        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2292                return -EFAULT;
2293
2294        rtnl_lock();
2295        err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2296                             ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2297                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2298        rtnl_unlock();
2299        return err;
2300}
2301
2302int addrconf_del_ifaddr(struct net *net, void __user *arg)
2303{
2304        struct in6_ifreq ireq;
2305        int err;
2306
2307        if (!capable(CAP_NET_ADMIN))
2308                return -EPERM;
2309
2310        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2311                return -EFAULT;
2312
2313        rtnl_lock();
2314        err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2315                             ireq.ifr6_prefixlen);
2316        rtnl_unlock();
2317        return err;
2318}
2319
2320static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2321                     int plen, int scope)
2322{
2323        struct inet6_ifaddr *ifp;
2324
2325        ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2326        if (!IS_ERR(ifp)) {
2327                spin_lock_bh(&ifp->lock);
2328                ifp->flags &= ~IFA_F_TENTATIVE;
2329                spin_unlock_bh(&ifp->lock);
2330                ipv6_ifa_notify(RTM_NEWADDR, ifp);
2331                in6_ifa_put(ifp);
2332        }
2333}
2334
2335#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2336static void sit_add_v4_addrs(struct inet6_dev *idev)
2337{
2338        struct in6_addr addr;
2339        struct net_device *dev;
2340        struct net *net = dev_net(idev->dev);
2341        int scope;
2342
2343        ASSERT_RTNL();
2344
2345        memset(&addr, 0, sizeof(struct in6_addr));
2346        memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2347
2348        if (idev->dev->flags&IFF_POINTOPOINT) {
2349                addr.s6_addr32[0] = htonl(0xfe800000);
2350                scope = IFA_LINK;
2351        } else {
2352                scope = IPV6_ADDR_COMPATv4;
2353        }
2354
2355        if (addr.s6_addr32[3]) {
2356                add_addr(idev, &addr, 128, scope);
2357                return;
2358        }
2359
2360        for_each_netdev(net, dev) {
2361                struct in_device *in_dev = __in_dev_get_rtnl(dev);
2362                if (in_dev && (dev->flags & IFF_UP)) {
2363                        struct in_ifaddr *ifa;
2364
2365                        int flag = scope;
2366
2367                        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2368                                int plen;
2369
2370                                addr.s6_addr32[3] = ifa->ifa_local;
2371
2372                                if (ifa->ifa_scope == RT_SCOPE_LINK)
2373                                        continue;
2374                                if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2375                                        if (idev->dev->flags&IFF_POINTOPOINT)
2376                                                continue;
2377                                        flag |= IFA_HOST;
2378                                }
2379                                if (idev->dev->flags&IFF_POINTOPOINT)
2380                                        plen = 64;
2381                                else
2382                                        plen = 96;
2383
2384                                add_addr(idev, &addr, plen, flag);
2385                        }
2386                }
2387        }
2388}
2389#endif
2390
2391static void init_loopback(struct net_device *dev)
2392{
2393        struct inet6_dev  *idev;
2394
2395        /* ::1 */
2396
2397        ASSERT_RTNL();
2398
2399        if ((idev = ipv6_find_idev(dev)) == NULL) {
2400                pr_debug("%s: add_dev failed\n", __func__);
2401                return;
2402        }
2403
2404        add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2405}
2406
2407static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2408{
2409        struct inet6_ifaddr *ifp;
2410        u32 addr_flags = IFA_F_PERMANENT;
2411
2412#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2413        if (idev->cnf.optimistic_dad &&
2414            !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2415                addr_flags |= IFA_F_OPTIMISTIC;
2416#endif
2417
2418
2419        ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2420        if (!IS_ERR(ifp)) {
2421                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2422                addrconf_dad_start(ifp);
2423                in6_ifa_put(ifp);
2424        }
2425}
2426
2427static void addrconf_dev_config(struct net_device *dev)
2428{
2429        struct in6_addr addr;
2430        struct inet6_dev *idev;
2431
2432        ASSERT_RTNL();
2433
2434        if ((dev->type != ARPHRD_ETHER) &&
2435            (dev->type != ARPHRD_FDDI) &&
2436            (dev->type != ARPHRD_ARCNET) &&
2437            (dev->type != ARPHRD_INFINIBAND) &&
2438            (dev->type != ARPHRD_IEEE802154)) {
2439                /* Alas, we support only Ethernet autoconfiguration. */
2440                return;
2441        }
2442
2443        idev = addrconf_add_dev(dev);
2444        if (IS_ERR(idev))
2445                return;
2446
2447        memset(&addr, 0, sizeof(struct in6_addr));
2448        addr.s6_addr32[0] = htonl(0xFE800000);
2449
2450        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2451                addrconf_add_linklocal(idev, &addr);
2452}
2453
2454#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2455static void addrconf_sit_config(struct net_device *dev)
2456{
2457        struct inet6_dev *idev;
2458
2459        ASSERT_RTNL();
2460
2461        /*
2462         * Configure the tunnel with one of our IPv4
2463         * addresses... we should configure all of
2464         * our v4 addrs in the tunnel
2465         */
2466
2467        if ((idev = ipv6_find_idev(dev)) == NULL) {
2468                pr_debug("%s: add_dev failed\n", __func__);
2469                return;
2470        }
2471
2472        if (dev->priv_flags & IFF_ISATAP) {
2473                struct in6_addr addr;
2474
2475                ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2476                addrconf_prefix_route(&addr, 64, dev, 0, 0);
2477                if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2478                        addrconf_add_linklocal(idev, &addr);
2479                return;
2480        }
2481
2482        sit_add_v4_addrs(idev);
2483
2484        if (dev->flags&IFF_POINTOPOINT) {
2485                addrconf_add_mroute(dev);
2486                addrconf_add_lroute(dev);
2487        } else
2488                sit_route_add(dev);
2489}
2490#endif
2491
2492#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2493static void addrconf_gre_config(struct net_device *dev)
2494{
2495        struct inet6_dev *idev;
2496        struct in6_addr addr;
2497
2498        pr_info("%s(%s)\n", __func__, dev->name);
2499
2500        ASSERT_RTNL();
2501
2502        if ((idev = ipv6_find_idev(dev)) == NULL) {
2503                pr_debug("%s: add_dev failed\n", __func__);
2504                return;
2505        }
2506
2507        ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2508        addrconf_prefix_route(&addr, 64, dev, 0, 0);
2509
2510        if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2511                addrconf_add_linklocal(idev, &addr);
2512}
2513#endif
2514
2515static inline int
2516ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2517{
2518        struct in6_addr lladdr;
2519
2520        if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2521                addrconf_add_linklocal(idev, &lladdr);
2522                return 0;
2523        }
2524        return -1;
2525}
2526
2527static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2528{
2529        struct net_device *link_dev;
2530        struct net *net = dev_net(idev->dev);
2531
2532        /* first try to inherit the link-local address from the link device */
2533        if (idev->dev->iflink &&
2534            (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2535                if (!ipv6_inherit_linklocal(idev, link_dev))
2536                        return;
2537        }
2538        /* then try to inherit it from any device */
2539        for_each_netdev(net, link_dev) {
2540                if (!ipv6_inherit_linklocal(idev, link_dev))
2541                        return;
2542        }
2543        pr_debug("init ip6-ip6: add_linklocal failed\n");
2544}
2545
2546/*
2547 * Autoconfigure tunnel with a link-local address so routing protocols,
2548 * DHCPv6, MLD etc. can be run over the virtual link
2549 */
2550
2551static void addrconf_ip6_tnl_config(struct net_device *dev)
2552{
2553        struct inet6_dev *idev;
2554
2555        ASSERT_RTNL();
2556
2557        idev = addrconf_add_dev(dev);
2558        if (IS_ERR(idev)) {
2559                pr_debug("init ip6-ip6: add_dev failed\n");
2560                return;
2561        }
2562        ip6_tnl_add_linklocal(idev);
2563}
2564
2565static int addrconf_notify(struct notifier_block *this, unsigned long event,
2566                           void *data)
2567{
2568        struct net_device *dev = (struct net_device *) data;
2569        struct inet6_dev *idev = __in6_dev_get(dev);
2570        int run_pending = 0;
2571        int err;
2572
2573        switch (event) {
2574        case NETDEV_REGISTER:
2575                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2576                        idev = ipv6_add_dev(dev);
2577                        if (!idev)
2578                                return notifier_from_errno(-ENOMEM);
2579                }
2580                break;
2581
2582        case NETDEV_UP:
2583        case NETDEV_CHANGE:
2584                if (dev->flags & IFF_SLAVE)
2585                        break;
2586
2587                if (event == NETDEV_UP) {
2588                        if (!addrconf_qdisc_ok(dev)) {
2589                                /* device is not ready yet. */
2590                                pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2591                                        dev->name);
2592                                break;
2593                        }
2594
2595                        if (!idev && dev->mtu >= IPV6_MIN_MTU)
2596                                idev = ipv6_add_dev(dev);
2597
2598                        if (idev) {
2599                                idev->if_flags |= IF_READY;
2600                                run_pending = 1;
2601                        }
2602                } else {
2603                        if (!addrconf_qdisc_ok(dev)) {
2604                                /* device is still not ready. */
2605                                break;
2606                        }
2607
2608                        if (idev) {
2609                                if (idev->if_flags & IF_READY)
2610                                        /* device is already configured. */
2611                                        break;
2612                                idev->if_flags |= IF_READY;
2613                        }
2614
2615                        pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2616                                dev->name);
2617
2618                        run_pending = 1;
2619                }
2620
2621                switch (dev->type) {
2622#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2623                case ARPHRD_SIT:
2624                        addrconf_sit_config(dev);
2625                        break;
2626#endif
2627#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2628                case ARPHRD_IPGRE:
2629                        addrconf_gre_config(dev);
2630                        break;
2631#endif
2632                case ARPHRD_TUNNEL6:
2633                        addrconf_ip6_tnl_config(dev);
2634                        break;
2635                case ARPHRD_LOOPBACK:
2636                        init_loopback(dev);
2637                        break;
2638
2639                default:
2640                        addrconf_dev_config(dev);
2641                        break;
2642                }
2643
2644                if (idev) {
2645                        if (run_pending)
2646                                addrconf_dad_run(idev);
2647
2648                        /*
2649                         * If the MTU changed during the interface down,
2650                         * when the interface up, the changed MTU must be
2651                         * reflected in the idev as well as routers.
2652                         */
2653                        if (idev->cnf.mtu6 != dev->mtu &&
2654                            dev->mtu >= IPV6_MIN_MTU) {
2655                                rt6_mtu_change(dev, dev->mtu);
2656                                idev->cnf.mtu6 = dev->mtu;
2657                        }
2658                        idev->tstamp = jiffies;
2659                        inet6_ifinfo_notify(RTM_NEWLINK, idev);
2660
2661                        /*
2662                         * If the changed mtu during down is lower than
2663                         * IPV6_MIN_MTU stop IPv6 on this interface.
2664                         */
2665                        if (dev->mtu < IPV6_MIN_MTU)
2666                                addrconf_ifdown(dev, 1);
2667                }
2668                break;
2669
2670        case NETDEV_CHANGEMTU:
2671                if (idev && dev->mtu >= IPV6_MIN_MTU) {
2672                        rt6_mtu_change(dev, dev->mtu);
2673                        idev->cnf.mtu6 = dev->mtu;
2674                        break;
2675                }
2676
2677                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2678                        idev = ipv6_add_dev(dev);
2679                        if (idev)
2680                                break;
2681                }
2682
2683                /*
2684                 * MTU falled under IPV6_MIN_MTU.
2685                 * Stop IPv6 on this interface.
2686                 */
2687
2688        case NETDEV_DOWN:
2689        case NETDEV_UNREGISTER:
2690                /*
2691                 *      Remove all addresses from this interface.
2692                 */
2693                addrconf_ifdown(dev, event != NETDEV_DOWN);
2694                break;
2695
2696        case NETDEV_CHANGENAME:
2697                if (idev) {
2698                        snmp6_unregister_dev(idev);
2699                        addrconf_sysctl_unregister(idev);
2700                        addrconf_sysctl_register(idev);
2701                        err = snmp6_register_dev(idev);
2702                        if (err)
2703                                return notifier_from_errno(err);
2704                }
2705                break;
2706
2707        case NETDEV_PRE_TYPE_CHANGE:
2708        case NETDEV_POST_TYPE_CHANGE:
2709                addrconf_type_change(dev, event);
2710                break;
2711        }
2712
2713        return NOTIFY_OK;
2714}
2715
2716/*
2717 *      addrconf module should be notified of a device going up
2718 */
2719static struct notifier_block ipv6_dev_notf = {
2720        .notifier_call = addrconf_notify,
2721};
2722
2723static void addrconf_type_change(struct net_device *dev, unsigned long event)
2724{
2725        struct inet6_dev *idev;
2726        ASSERT_RTNL();
2727
2728        idev = __in6_dev_get(dev);
2729
2730        if (event == NETDEV_POST_TYPE_CHANGE)
2731                ipv6_mc_remap(idev);
2732        else if (event == NETDEV_PRE_TYPE_CHANGE)
2733                ipv6_mc_unmap(idev);
2734}
2735
2736static int addrconf_ifdown(struct net_device *dev, int how)
2737{
2738        struct net *net = dev_net(dev);
2739        struct inet6_dev *idev;
2740        struct inet6_ifaddr *ifa;
2741        int state, i;
2742
2743        ASSERT_RTNL();
2744
2745        rt6_ifdown(net, dev);
2746        neigh_ifdown(&nd_tbl, dev);
2747
2748        idev = __in6_dev_get(dev);
2749        if (idev == NULL)
2750                return -ENODEV;
2751
2752        /*
2753         * Step 1: remove reference to ipv6 device from parent device.
2754         *         Do not dev_put!
2755         */
2756        if (how) {
2757                idev->dead = 1;
2758
2759                /* protected by rtnl_lock */
2760                RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2761
2762                /* Step 1.5: remove snmp6 entry */
2763                snmp6_unregister_dev(idev);
2764
2765        }
2766
2767        /* Step 2: clear hash table */
2768        for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2769                struct hlist_head *h = &inet6_addr_lst[i];
2770                struct hlist_node *n;
2771
2772                spin_lock_bh(&addrconf_hash_lock);
2773        restart:
2774                hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2775                        if (ifa->idev == idev) {
2776                                hlist_del_init_rcu(&ifa->addr_lst);
2777                                addrconf_del_timer(ifa);
2778                                goto restart;
2779                        }
2780                }
2781                spin_unlock_bh(&addrconf_hash_lock);
2782        }
2783
2784        write_lock_bh(&idev->lock);
2785
2786        /* Step 2: clear flags for stateless addrconf */
2787        if (!how)
2788                idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2789
2790#ifdef CONFIG_IPV6_PRIVACY
2791        if (how && del_timer(&idev->regen_timer))
2792                in6_dev_put(idev);
2793
2794        /* Step 3: clear tempaddr list */
2795        while (!list_empty(&idev->tempaddr_list)) {
2796                ifa = list_first_entry(&idev->tempaddr_list,
2797                                       struct inet6_ifaddr, tmp_list);
2798                list_del(&ifa->tmp_list);
2799                write_unlock_bh(&idev->lock);
2800                spin_lock_bh(&ifa->lock);
2801
2802                if (ifa->ifpub) {
2803                        in6_ifa_put(ifa->ifpub);
2804                        ifa->ifpub = NULL;
2805                }
2806                spin_unlock_bh(&ifa->lock);
2807                in6_ifa_put(ifa);
2808                write_lock_bh(&idev->lock);
2809        }
2810#endif
2811
2812        while (!list_empty(&idev->addr_list)) {
2813                ifa = list_first_entry(&idev->addr_list,
2814                                       struct inet6_ifaddr, if_list);
2815                addrconf_del_timer(ifa);
2816
2817                list_del(&ifa->if_list);
2818
2819                write_unlock_bh(&idev->lock);
2820
2821                spin_lock_bh(&ifa->state_lock);
2822                state = ifa->state;
2823                ifa->state = INET6_IFADDR_STATE_DEAD;
2824                spin_unlock_bh(&ifa->state_lock);
2825
2826                if (state != INET6_IFADDR_STATE_DEAD) {
2827                        __ipv6_ifa_notify(RTM_DELADDR, ifa);
2828                        atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2829                }
2830                in6_ifa_put(ifa);
2831
2832                write_lock_bh(&idev->lock);
2833        }
2834
2835        write_unlock_bh(&idev->lock);
2836
2837        /* Step 5: Discard multicast list */
2838        if (how)
2839                ipv6_mc_destroy_dev(idev);
2840        else
2841                ipv6_mc_down(idev);
2842
2843        idev->tstamp = jiffies;
2844
2845        /* Last: Shot the device (if unregistered) */
2846        if (how) {
2847                addrconf_sysctl_unregister(idev);
2848                neigh_parms_release(&nd_tbl, idev->nd_parms);
2849                neigh_ifdown(&nd_tbl, dev);
2850                in6_dev_put(idev);
2851        }
2852        return 0;
2853}
2854
2855static void addrconf_rs_timer(unsigned long data)
2856{
2857        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2858        struct inet6_dev *idev = ifp->idev;
2859
2860        read_lock(&idev->lock);
2861        if (idev->dead || !(idev->if_flags & IF_READY))
2862                goto out;
2863
2864        if (idev->cnf.forwarding)
2865                goto out;
2866
2867        /* Announcement received after solicitation was sent */
2868        if (idev->if_flags & IF_RA_RCVD)
2869                goto out;
2870
2871        spin_lock(&ifp->lock);
2872        if (ifp->probes++ < idev->cnf.rtr_solicits) {
2873                /* The wait after the last probe can be shorter */
2874                addrconf_mod_timer(ifp, AC_RS,
2875                                   (ifp->probes == idev->cnf.rtr_solicits) ?
2876                                   idev->cnf.rtr_solicit_delay :
2877                                   idev->cnf.rtr_solicit_interval);
2878                spin_unlock(&ifp->lock);
2879
2880                ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2881        } else {
2882                spin_unlock(&ifp->lock);
2883                /*
2884                 * Note: we do not support deprecated "all on-link"
2885                 * assumption any longer.
2886                 */
2887                pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
2888        }
2889
2890out:
2891        read_unlock(&idev->lock);
2892        in6_ifa_put(ifp);
2893}
2894
2895/*
2896 *      Duplicate Address Detection
2897 */
2898static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2899{
2900        unsigned long rand_num;
2901        struct inet6_dev *idev = ifp->idev;
2902
2903        if (ifp->flags & IFA_F_OPTIMISTIC)
2904                rand_num = 0;
2905        else
2906                rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2907
2908        ifp->probes = idev->cnf.dad_transmits;
2909        addrconf_mod_timer(ifp, AC_DAD, rand_num);
2910}
2911
2912static void addrconf_dad_start(struct inet6_ifaddr *ifp)
2913{
2914        struct inet6_dev *idev = ifp->idev;
2915        struct net_device *dev = idev->dev;
2916
2917        addrconf_join_solict(dev, &ifp->addr);
2918
2919        net_srandom(ifp->addr.s6_addr32[3]);
2920
2921        read_lock_bh(&idev->lock);
2922        spin_lock(&ifp->lock);
2923        if (ifp->state == INET6_IFADDR_STATE_DEAD)
2924                goto out;
2925
2926        if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2927            idev->cnf.accept_dad < 1 ||
2928            !(ifp->flags&IFA_F_TENTATIVE) ||
2929            ifp->flags & IFA_F_NODAD) {
2930                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2931                spin_unlock(&ifp->lock);
2932                read_unlock_bh(&idev->lock);
2933
2934                addrconf_dad_completed(ifp);
2935                return;
2936        }
2937
2938        if (!(idev->if_flags & IF_READY)) {
2939                spin_unlock(&ifp->lock);
2940                read_unlock_bh(&idev->lock);
2941                /*
2942                 * If the device is not ready:
2943                 * - keep it tentative if it is a permanent address.
2944                 * - otherwise, kill it.
2945                 */
2946                in6_ifa_hold(ifp);
2947                addrconf_dad_stop(ifp, 0);
2948                return;
2949        }
2950
2951        /*
2952         * Optimistic nodes can start receiving
2953         * Frames right away
2954         */
2955        if (ifp->flags & IFA_F_OPTIMISTIC)
2956                ip6_ins_rt(ifp->rt);
2957
2958        addrconf_dad_kick(ifp);
2959out:
2960        spin_unlock(&ifp->lock);
2961        read_unlock_bh(&idev->lock);
2962}
2963
2964static void addrconf_dad_timer(unsigned long data)
2965{
2966        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2967        struct inet6_dev *idev = ifp->idev;
2968        struct in6_addr mcaddr;
2969
2970        if (!ifp->probes && addrconf_dad_end(ifp))
2971                goto out;
2972
2973        read_lock(&idev->lock);
2974        if (idev->dead || !(idev->if_flags & IF_READY)) {
2975                read_unlock(&idev->lock);
2976                goto out;
2977        }
2978
2979        spin_lock(&ifp->lock);
2980        if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2981                spin_unlock(&ifp->lock);
2982                read_unlock(&idev->lock);
2983                goto out;
2984        }
2985
2986        if (ifp->probes == 0) {
2987                /*
2988                 * DAD was successful
2989                 */
2990
2991                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2992                spin_unlock(&ifp->lock);
2993                read_unlock(&idev->lock);
2994
2995                addrconf_dad_completed(ifp);
2996
2997                goto out;
2998        }
2999
3000        ifp->probes--;
3001        addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3002        spin_unlock(&ifp->lock);
3003        read_unlock(&idev->lock);
3004
3005        /* send a neighbour solicitation for our addr */
3006        addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3007        ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3008out:
3009        in6_ifa_put(ifp);
3010}
3011
3012static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3013{
3014        struct net_device *dev = ifp->idev->dev;
3015
3016        /*
3017         *      Configure the address for reception. Now it is valid.
3018         */
3019
3020        ipv6_ifa_notify(RTM_NEWADDR, ifp);
3021
3022        /* If added prefix is link local and we are prepared to process
3023           router advertisements, start sending router solicitations.
3024         */
3025
3026        if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3027             ifp->idev->cnf.accept_ra == 2) &&
3028            ifp->idev->cnf.rtr_solicits > 0 &&
3029            (dev->flags&IFF_LOOPBACK) == 0 &&
3030            (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3031                /*
3032                 *      If a host as already performed a random delay
3033                 *      [...] as part of DAD [...] there is no need
3034                 *      to delay again before sending the first RS
3035                 */
3036                ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3037
3038                spin_lock_bh(&ifp->lock);
3039                ifp->probes = 1;
3040                ifp->idev->if_flags |= IF_RS_SENT;
3041                addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3042                spin_unlock_bh(&ifp->lock);
3043        }
3044}
3045
3046static void addrconf_dad_run(struct inet6_dev *idev)
3047{
3048        struct inet6_ifaddr *ifp;
3049
3050        read_lock_bh(&idev->lock);
3051        list_for_each_entry(ifp, &idev->addr_list, if_list) {
3052                spin_lock(&ifp->lock);
3053                if (ifp->flags & IFA_F_TENTATIVE &&
3054                    ifp->state == INET6_IFADDR_STATE_DAD)
3055                        addrconf_dad_kick(ifp);
3056                spin_unlock(&ifp->lock);
3057        }
3058        read_unlock_bh(&idev->lock);
3059}
3060
3061#ifdef CONFIG_PROC_FS
3062struct if6_iter_state {
3063        struct seq_net_private p;
3064        int bucket;
3065        int offset;
3066};
3067
3068static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3069{
3070        struct inet6_ifaddr *ifa = NULL;
3071        struct if6_iter_state *state = seq->private;
3072        struct net *net = seq_file_net(seq);
3073        int p = 0;
3074
3075        /* initial bucket if pos is 0 */
3076        if (pos == 0) {
3077                state->bucket = 0;
3078                state->offset = 0;
3079        }
3080
3081        for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3082                struct hlist_node *n;
3083                hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3084                                         addr_lst) {
3085                        /* sync with offset */
3086                        if (p < state->offset) {
3087                                p++;
3088                                continue;
3089                        }
3090                        state->offset++;
3091                        if (net_eq(dev_net(ifa->idev->dev), net))
3092                                return ifa;
3093                }
3094
3095                /* prepare for next bucket */
3096                state->offset = 0;
3097                p = 0;
3098        }
3099        return NULL;
3100}
3101
3102static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3103                                         struct inet6_ifaddr *ifa)
3104{
3105        struct if6_iter_state *state = seq->private;
3106        struct net *net = seq_file_net(seq);
3107        struct hlist_node *n = &ifa->addr_lst;
3108
3109        hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3110                state->offset++;
3111                if (net_eq(dev_net(ifa->idev->dev), net))
3112                        return ifa;
3113        }
3114
3115        while (++state->bucket < IN6_ADDR_HSIZE) {
3116                state->offset = 0;
3117                hlist_for_each_entry_rcu_bh(ifa, n,
3118                                     &inet6_addr_lst[state->bucket], addr_lst) {
3119                        state->offset++;
3120                        if (net_eq(dev_net(ifa->idev->dev), net))
3121                                return ifa;
3122                }
3123        }
3124
3125        return NULL;
3126}
3127
3128static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3129        __acquires(rcu_bh)
3130{
3131        rcu_read_lock_bh();
3132        return if6_get_first(seq, *pos);
3133}
3134
3135static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3136{
3137        struct inet6_ifaddr *ifa;
3138
3139        ifa = if6_get_next(seq, v);
3140        ++*pos;
3141        return ifa;
3142}
3143
3144static void if6_seq_stop(struct seq_file *seq, void *v)
3145        __releases(rcu_bh)
3146{
3147        rcu_read_unlock_bh();
3148}
3149
3150static int if6_seq_show(struct seq_file *seq, void *v)
3151{
3152        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3153        seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3154                   &ifp->addr,
3155                   ifp->idev->dev->ifindex,
3156                   ifp->prefix_len,
3157                   ifp->scope,
3158                   ifp->flags,
3159                   ifp->idev->dev->name);
3160        return 0;
3161}
3162
3163static const struct seq_operations if6_seq_ops = {
3164        .start  = if6_seq_start,
3165        .next   = if6_seq_next,
3166        .show   = if6_seq_show,
3167        .stop   = if6_seq_stop,
3168};
3169
3170static int if6_seq_open(struct inode *inode, struct file *file)
3171{
3172        return seq_open_net(inode, file, &if6_seq_ops,
3173                            sizeof(struct if6_iter_state));
3174}
3175
3176static const struct file_operations if6_fops = {
3177        .owner          = THIS_MODULE,
3178        .open           = if6_seq_open,
3179        .read           = seq_read,
3180        .llseek         = seq_lseek,
3181        .release        = seq_release_net,
3182};
3183
3184static int __net_init if6_proc_net_init(struct net *net)
3185{
3186        if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3187                return -ENOMEM;
3188        return 0;
3189}
3190
3191static void __net_exit if6_proc_net_exit(struct net *net)
3192{
3193       proc_net_remove(net, "if_inet6");
3194}
3195
3196static struct pernet_operations if6_proc_net_ops = {
3197       .init = if6_proc_net_init,
3198       .exit = if6_proc_net_exit,
3199};
3200
3201int __init if6_proc_init(void)
3202{
3203        return register_pernet_subsys(&if6_proc_net_ops);
3204}
3205
3206void if6_proc_exit(void)
3207{
3208        unregister_pernet_subsys(&if6_proc_net_ops);
3209}
3210#endif  /* CONFIG_PROC_FS */
3211
3212#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3213/* Check if address is a home address configured on any interface. */
3214int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3215{
3216        int ret = 0;
3217        struct inet6_ifaddr *ifp = NULL;
3218        struct hlist_node *n;
3219        unsigned int hash = inet6_addr_hash(addr);
3220
3221        rcu_read_lock_bh();
3222        hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3223                if (!net_eq(dev_net(ifp->idev->dev), net))
3224                        continue;
3225                if (ipv6_addr_equal(&ifp->addr, addr) &&
3226                    (ifp->flags & IFA_F_HOMEADDRESS)) {
3227                        ret = 1;
3228                        break;
3229                }
3230        }
3231        rcu_read_unlock_bh();
3232        return ret;
3233}
3234#endif
3235
3236/*
3237 *      Periodic address status verification
3238 */
3239
3240static void addrconf_verify(unsigned long foo)
3241{
3242        unsigned long now, next, next_sec, next_sched;
3243        struct inet6_ifaddr *ifp;
3244        struct hlist_node *node;
3245        int i;
3246
3247        rcu_read_lock_bh();
3248        spin_lock(&addrconf_verify_lock);
3249        now = jiffies;
3250        next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3251
3252        del_timer(&addr_chk_timer);
3253
3254        for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3255restart:
3256                hlist_for_each_entry_rcu_bh(ifp, node,
3257                                         &inet6_addr_lst[i], addr_lst) {
3258                        unsigned long age;
3259
3260                        if (ifp->flags & IFA_F_PERMANENT)
3261                                continue;
3262
3263                        spin_lock(&ifp->lock);
3264                        /* We try to batch several events at once. */
3265                        age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3266
3267                        if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3268                            age >= ifp->valid_lft) {
3269                                spin_unlock(&ifp->lock);
3270                                in6_ifa_hold(ifp);
3271                                ipv6_del_addr(ifp);
3272                                goto restart;
3273                        } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3274                                spin_unlock(&ifp->lock);
3275                                continue;
3276                        } else if (age >= ifp->prefered_lft) {
3277                                /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3278                                int deprecate = 0;
3279
3280                                if (!(ifp->flags&IFA_F_DEPRECATED)) {
3281                                        deprecate = 1;
3282                                        ifp->flags |= IFA_F_DEPRECATED;
3283                                }
3284
3285                                if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3286                                        next = ifp->tstamp + ifp->valid_lft * HZ;
3287
3288                                spin_unlock(&ifp->lock);
3289
3290                                if (deprecate) {
3291                                        in6_ifa_hold(ifp);
3292
3293                                        ipv6_ifa_notify(0, ifp);
3294                                        in6_ifa_put(ifp);
3295                                        goto restart;
3296                                }
3297#ifdef CONFIG_IPV6_PRIVACY
3298                        } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3299                                   !(ifp->flags&IFA_F_TENTATIVE)) {
3300                                unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3301                                        ifp->idev->cnf.dad_transmits *
3302                                        ifp->idev->nd_parms->retrans_time / HZ;
3303
3304                                if (age >= ifp->prefered_lft - regen_advance) {
3305                                        struct inet6_ifaddr *ifpub = ifp->ifpub;
3306                                        if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3307                                                next = ifp->tstamp + ifp->prefered_lft * HZ;
3308                                        if (!ifp->regen_count && ifpub) {
3309                                                ifp->regen_count++;
3310                                                in6_ifa_hold(ifp);
3311                                                in6_ifa_hold(ifpub);
3312                                                spin_unlock(&ifp->lock);
3313
3314                                                spin_lock(&ifpub->lock);
3315                                                ifpub->regen_count = 0;
3316                                                spin_unlock(&ifpub->lock);
3317                                                ipv6_create_tempaddr(ifpub, ifp);
3318                                                in6_ifa_put(ifpub);
3319                                                in6_ifa_put(ifp);
3320                                                goto restart;
3321                                        }
3322                                } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3323                                        next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3324                                spin_unlock(&ifp->lock);
3325#endif
3326                        } else {
3327                                /* ifp->prefered_lft <= ifp->valid_lft */
3328                                if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3329                                        next = ifp->tstamp + ifp->prefered_lft * HZ;
3330                                spin_unlock(&ifp->lock);
3331                        }
3332                }
3333        }
3334
3335        next_sec = round_jiffies_up(next);
3336        next_sched = next;
3337
3338        /* If rounded timeout is accurate enough, accept it. */
3339        if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3340                next_sched = next_sec;
3341
3342        /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3343        if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3344                next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3345
3346        ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3347              now, next, next_sec, next_sched));
3348
3349        addr_chk_timer.expires = next_sched;
3350        add_timer(&addr_chk_timer);
3351        spin_unlock(&addrconf_verify_lock);
3352        rcu_read_unlock_bh();
3353}
3354
3355static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3356{
3357        struct in6_addr *pfx = NULL;
3358
3359        if (addr)
3360                pfx = nla_data(addr);
3361
3362        if (local) {
3363                if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3364                        pfx = NULL;
3365                else
3366                        pfx = nla_data(local);
3367        }
3368
3369        return pfx;
3370}
3371
3372static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3373        [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3374        [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3375        [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3376};
3377
3378static int
3379inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3380{
3381        struct net *net = sock_net(skb->sk);
3382        struct ifaddrmsg *ifm;
3383        struct nlattr *tb[IFA_MAX+1];
3384        struct in6_addr *pfx;
3385        int err;
3386
3387        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3388        if (err < 0)
3389                return err;
3390
3391        ifm = nlmsg_data(nlh);
3392        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3393        if (pfx == NULL)
3394                return -EINVAL;
3395
3396        return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3397}
3398
3399static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3400                             u32 prefered_lft, u32 valid_lft)
3401{
3402        u32 flags;
3403        clock_t expires;
3404        unsigned long timeout;
3405
3406        if (!valid_lft || (prefered_lft > valid_lft))
3407                return -EINVAL;
3408
3409        timeout = addrconf_timeout_fixup(valid_lft, HZ);
3410        if (addrconf_finite_timeout(timeout)) {
3411                expires = jiffies_to_clock_t(timeout * HZ);
3412                valid_lft = timeout;
3413                flags = RTF_EXPIRES;
3414        } else {
3415                expires = 0;
3416                flags = 0;
3417                ifa_flags |= IFA_F_PERMANENT;
3418        }
3419
3420        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3421        if (addrconf_finite_timeout(timeout)) {
3422                if (timeout == 0)
3423                        ifa_flags |= IFA_F_DEPRECATED;
3424                prefered_lft = timeout;
3425        }
3426
3427        spin_lock_bh(&ifp->lock);
3428        ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3429        ifp->tstamp = jiffies;
3430        ifp->valid_lft = valid_lft;
3431        ifp->prefered_lft = prefered_lft;
3432
3433        spin_unlock_bh(&ifp->lock);
3434        if (!(ifp->flags&IFA_F_TENTATIVE))
3435                ipv6_ifa_notify(0, ifp);
3436
3437        addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3438                              expires, flags);
3439        addrconf_verify(0);
3440
3441        return 0;
3442}
3443
3444static int
3445inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3446{
3447        struct net *net = sock_net(skb->sk);
3448        struct ifaddrmsg *ifm;
3449        struct nlattr *tb[IFA_MAX+1];
3450        struct in6_addr *pfx;
3451        struct inet6_ifaddr *ifa;
3452        struct net_device *dev;
3453        u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3454        u8 ifa_flags;
3455        int err;
3456
3457        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3458        if (err < 0)
3459                return err;
3460
3461        ifm = nlmsg_data(nlh);
3462        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3463        if (pfx == NULL)
3464                return -EINVAL;
3465
3466        if (tb[IFA_CACHEINFO]) {
3467                struct ifa_cacheinfo *ci;
3468
3469                ci = nla_data(tb[IFA_CACHEINFO]);
3470                valid_lft = ci->ifa_valid;
3471                preferred_lft = ci->ifa_prefered;
3472        } else {
3473                preferred_lft = INFINITY_LIFE_TIME;
3474                valid_lft = INFINITY_LIFE_TIME;
3475        }
3476
3477        dev =  __dev_get_by_index(net, ifm->ifa_index);
3478        if (dev == NULL)
3479                return -ENODEV;
3480
3481        /* We ignore other flags so far. */
3482        ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3483
3484        ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3485        if (ifa == NULL) {
3486                /*
3487                 * It would be best to check for !NLM_F_CREATE here but
3488                 * userspace alreay relies on not having to provide this.
3489                 */
3490                return inet6_addr_add(net, ifm->ifa_index, pfx,
3491                                      ifm->ifa_prefixlen, ifa_flags,
3492                                      preferred_lft, valid_lft);
3493        }
3494
3495        if (nlh->nlmsg_flags & NLM_F_EXCL ||
3496            !(nlh->nlmsg_flags & NLM_F_REPLACE))
3497                err = -EEXIST;
3498        else
3499                err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3500
3501        in6_ifa_put(ifa);
3502
3503        return err;
3504}
3505
3506static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3507                          u8 scope, int ifindex)
3508{
3509        struct ifaddrmsg *ifm;
3510
3511        ifm = nlmsg_data(nlh);
3512        ifm->ifa_family = AF_INET6;
3513        ifm->ifa_prefixlen = prefixlen;
3514        ifm->ifa_flags = flags;
3515        ifm->ifa_scope = scope;
3516        ifm->ifa_index = ifindex;
3517}
3518
3519static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3520                         unsigned long tstamp, u32 preferred, u32 valid)
3521{
3522        struct ifa_cacheinfo ci;
3523
3524        ci.cstamp = cstamp_delta(cstamp);
3525        ci.tstamp = cstamp_delta(tstamp);
3526        ci.ifa_prefered = preferred;
3527        ci.ifa_valid = valid;
3528
3529        return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3530}
3531
3532static inline int rt_scope(int ifa_scope)
3533{
3534        if (ifa_scope & IFA_HOST)
3535                return RT_SCOPE_HOST;
3536        else if (ifa_scope & IFA_LINK)
3537                return RT_SCOPE_LINK;
3538        else if (ifa_scope & IFA_SITE)
3539                return RT_SCOPE_SITE;
3540        else
3541                return RT_SCOPE_UNIVERSE;
3542}
3543
3544static inline int inet6_ifaddr_msgsize(void)
3545{
3546        return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3547               + nla_total_size(16) /* IFA_ADDRESS */
3548               + nla_total_size(sizeof(struct ifa_cacheinfo));
3549}
3550
3551static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3552                             u32 pid, u32 seq, int event, unsigned int flags)
3553{
3554        struct nlmsghdr  *nlh;
3555        u32 preferred, valid;
3556
3557        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3558        if (nlh == NULL)
3559                return -EMSGSIZE;
3560
3561        put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3562                      ifa->idev->dev->ifindex);
3563
3564        if (!(ifa->flags&IFA_F_PERMANENT)) {
3565                preferred = ifa->prefered_lft;
3566                valid = ifa->valid_lft;
3567                if (preferred != INFINITY_LIFE_TIME) {
3568                        long tval = (jiffies - ifa->tstamp)/HZ;
3569                        if (preferred > tval)
3570                                preferred -= tval;
3571                        else
3572                                preferred = 0;
3573                        if (valid != INFINITY_LIFE_TIME) {
3574                                if (valid > tval)
3575                                        valid -= tval;
3576                                else
3577                                        valid = 0;
3578                        }
3579                }
3580        } else {
3581                preferred = INFINITY_LIFE_TIME;
3582                valid = INFINITY_LIFE_TIME;
3583        }
3584
3585        if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3586            put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3587                nlmsg_cancel(skb, nlh);
3588                return -EMSGSIZE;
3589        }
3590
3591        return nlmsg_end(skb, nlh);
3592}
3593
3594static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3595                                u32 pid, u32 seq, int event, u16 flags)
3596{
3597        struct nlmsghdr  *nlh;
3598        u8 scope = RT_SCOPE_UNIVERSE;
3599        int ifindex = ifmca->idev->dev->ifindex;
3600
3601        if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3602                scope = RT_SCOPE_SITE;
3603
3604        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3605        if (nlh == NULL)
3606                return -EMSGSIZE;
3607
3608        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3609        if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3610            put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3611                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3612                nlmsg_cancel(skb, nlh);
3613                return -EMSGSIZE;
3614        }
3615
3616        return nlmsg_end(skb, nlh);
3617}
3618
3619static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3620                                u32 pid, u32 seq, int event, unsigned int flags)
3621{
3622        struct nlmsghdr  *nlh;
3623        u8 scope = RT_SCOPE_UNIVERSE;
3624        int ifindex = ifaca->aca_idev->dev->ifindex;
3625
3626        if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3627                scope = RT_SCOPE_SITE;
3628
3629        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3630        if (nlh == NULL)
3631                return -EMSGSIZE;
3632
3633        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3634        if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3635            put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3636                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3637                nlmsg_cancel(skb, nlh);
3638                return -EMSGSIZE;
3639        }
3640
3641        return nlmsg_end(skb, nlh);
3642}
3643
3644enum addr_type_t {
3645        UNICAST_ADDR,
3646        MULTICAST_ADDR,
3647        ANYCAST_ADDR,
3648};
3649
3650/* called with rcu_read_lock() */
3651static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3652                          struct netlink_callback *cb, enum addr_type_t type,
3653                          int s_ip_idx, int *p_ip_idx)
3654{
3655        struct ifmcaddr6 *ifmca;
3656        struct ifacaddr6 *ifaca;
3657        int err = 1;
3658        int ip_idx = *p_ip_idx;
3659
3660        read_lock_bh(&idev->lock);
3661        switch (type) {
3662        case UNICAST_ADDR: {
3663                struct inet6_ifaddr *ifa;
3664
3665                /* unicast address incl. temp addr */
3666                list_for_each_entry(ifa, &idev->addr_list, if_list) {
3667                        if (++ip_idx < s_ip_idx)
3668                                continue;
3669                        err = inet6_fill_ifaddr(skb, ifa,
3670                                                NETLINK_CB(cb->skb).pid,
3671                                                cb->nlh->nlmsg_seq,
3672                                                RTM_NEWADDR,
3673                                                NLM_F_MULTI);
3674                        if (err <= 0)
3675                                break;
3676                }
3677                break;
3678        }
3679        case MULTICAST_ADDR:
3680                /* multicast address */
3681                for (ifmca = idev->mc_list; ifmca;
3682                     ifmca = ifmca->next, ip_idx++) {
3683                        if (ip_idx < s_ip_idx)
3684                                continue;
3685                        err = inet6_fill_ifmcaddr(skb, ifmca,
3686                                                  NETLINK_CB(cb->skb).pid,
3687                                                  cb->nlh->nlmsg_seq,
3688                                                  RTM_GETMULTICAST,
3689                                                  NLM_F_MULTI);
3690                        if (err <= 0)
3691                                break;
3692                }
3693                break;
3694        case ANYCAST_ADDR:
3695                /* anycast address */
3696                for (ifaca = idev->ac_list; ifaca;
3697                     ifaca = ifaca->aca_next, ip_idx++) {
3698                        if (ip_idx < s_ip_idx)
3699                                continue;
3700                        err = inet6_fill_ifacaddr(skb, ifaca,
3701                                                  NETLINK_CB(cb->skb).pid,
3702                                                  cb->nlh->nlmsg_seq,
3703                                                  RTM_GETANYCAST,
3704                                                  NLM_F_MULTI);
3705                        if (err <= 0)
3706                                break;
3707                }
3708                break;
3709        default:
3710                break;
3711        }
3712        read_unlock_bh(&idev->lock);
3713        *p_ip_idx = ip_idx;
3714        return err;
3715}
3716
3717static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3718                           enum addr_type_t type)
3719{
3720        struct net *net = sock_net(skb->sk);
3721        int h, s_h;
3722        int idx, ip_idx;
3723        int s_idx, s_ip_idx;
3724        struct net_device *dev;
3725        struct inet6_dev *idev;
3726        struct hlist_head *head;
3727        struct hlist_node *node;
3728
3729        s_h = cb->args[0];
3730        s_idx = idx = cb->args[1];
3731        s_ip_idx = ip_idx = cb->args[2];
3732
3733        rcu_read_lock();
3734        for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3735                idx = 0;
3736                head = &net->dev_index_head[h];
3737                hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3738                        if (idx < s_idx)
3739                                goto cont;
3740                        if (h > s_h || idx > s_idx)
3741                                s_ip_idx = 0;
3742                        ip_idx = 0;
3743                        idev = __in6_dev_get(dev);
3744                        if (!idev)
3745                                goto cont;
3746
3747                        if (in6_dump_addrs(idev, skb, cb, type,
3748                                           s_ip_idx, &ip_idx) <= 0)
3749                                goto done;
3750cont:
3751                        idx++;
3752                }
3753        }
3754done:
3755        rcu_read_unlock();
3756        cb->args[0] = h;
3757        cb->args[1] = idx;
3758        cb->args[2] = ip_idx;
3759
3760        return skb->len;
3761}
3762
3763static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3764{
3765        enum addr_type_t type = UNICAST_ADDR;
3766
3767        return inet6_dump_addr(skb, cb, type);
3768}
3769
3770static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3771{
3772        enum addr_type_t type = MULTICAST_ADDR;
3773
3774        return inet6_dump_addr(skb, cb, type);
3775}
3776
3777
3778static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3779{
3780        enum addr_type_t type = ANYCAST_ADDR;
3781
3782        return inet6_dump_addr(skb, cb, type);
3783}
3784
3785static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3786                             void *arg)
3787{
3788        struct net *net = sock_net(in_skb->sk);
3789        struct ifaddrmsg *ifm;
3790        struct nlattr *tb[IFA_MAX+1];
3791        struct in6_addr *addr = NULL;
3792        struct net_device *dev = NULL;
3793        struct inet6_ifaddr *ifa;
3794        struct sk_buff *skb;
3795        int err;
3796
3797        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3798        if (err < 0)
3799                goto errout;
3800
3801        addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3802        if (addr == NULL) {
3803                err = -EINVAL;
3804                goto errout;
3805        }
3806
3807        ifm = nlmsg_data(nlh);
3808        if (ifm->ifa_index)
3809                dev = __dev_get_by_index(net, ifm->ifa_index);
3810
3811        ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3812        if (!ifa) {
3813                err = -EADDRNOTAVAIL;
3814                goto errout;
3815        }
3816
3817        skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3818        if (!skb) {
3819                err = -ENOBUFS;
3820                goto errout_ifa;
3821        }
3822
3823        err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3824                                nlh->nlmsg_seq, RTM_NEWADDR, 0);
3825        if (err < 0) {
3826                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3827                WARN_ON(err == -EMSGSIZE);
3828                kfree_skb(skb);
3829                goto errout_ifa;
3830        }
3831        err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3832errout_ifa:
3833        in6_ifa_put(ifa);
3834errout:
3835        return err;
3836}
3837
3838static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3839{
3840        struct sk_buff *skb;
3841        struct net *net = dev_net(ifa->idev->dev);
3842        int err = -ENOBUFS;
3843
3844        skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3845        if (skb == NULL)
3846                goto errout;
3847
3848        err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3849        if (err < 0) {
3850                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3851                WARN_ON(err == -EMSGSIZE);
3852                kfree_skb(skb);
3853                goto errout;
3854        }
3855        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3856        return;
3857errout:
3858        if (err < 0)
3859                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3860}
3861
3862static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3863                                __s32 *array, int bytes)
3864{
3865        BUG_ON(bytes < (DEVCONF_MAX * 4));
3866
3867        memset(array, 0, bytes);
3868        array[DEVCONF_FORWARDING] = cnf->forwarding;
3869        array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3870        array[DEVCONF_MTU6] = cnf->mtu6;
3871        array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3872        array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3873        array[DEVCONF_AUTOCONF] = cnf->autoconf;
3874        array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3875        array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3876        array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3877                jiffies_to_msecs(cnf->rtr_solicit_interval);
3878        array[DEVCONF_RTR_SOLICIT_DELAY] =
3879                jiffies_to_msecs(cnf->rtr_solicit_delay);
3880        array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3881#ifdef CONFIG_IPV6_PRIVACY
3882        array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3883        array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3884        array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3885        array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3886        array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3887#endif
3888        array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3889        array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3890        array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3891#ifdef CONFIG_IPV6_ROUTER_PREF
3892        array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3893        array[DEVCONF_RTR_PROBE_INTERVAL] =
3894                jiffies_to_msecs(cnf->rtr_probe_interval);
3895#ifdef CONFIG_IPV6_ROUTE_INFO
3896        array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3897#endif
3898#endif
3899        array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3900        array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3901#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3902        array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3903#endif
3904#ifdef CONFIG_IPV6_MROUTE
3905        array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3906#endif
3907        array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3908        array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3909        array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3910}
3911
3912static inline size_t inet6_ifla6_size(void)
3913{
3914        return nla_total_size(4) /* IFLA_INET6_FLAGS */
3915             + nla_total_size(sizeof(struct ifla_cacheinfo))
3916             + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3917             + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3918             + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3919}
3920
3921static inline size_t inet6_if_nlmsg_size(void)
3922{
3923        return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3924               + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3925               + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3926               + nla_total_size(4) /* IFLA_MTU */
3927               + nla_total_size(4) /* IFLA_LINK */
3928               + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3929}
3930
3931static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3932                                      int items, int bytes)
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(atomic_long_read(&mib[i]), &stats[i]);
3942
3943        memset(&stats[items], 0, pad);
3944}
3945
3946static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3947                                      int items, int bytes, size_t syncpoff)
3948{
3949        int i;
3950        int pad = bytes - sizeof(u64) * items;
3951        BUG_ON(pad < 0);
3952
3953        /* Use put_unaligned() because stats may not be aligned for u64. */
3954        put_unaligned(items, &stats[0]);
3955        for (i = 1; i < items; i++)
3956                put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3957
3958        memset(&stats[items], 0, pad);
3959}
3960
3961static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3962                             int bytes)
3963{
3964        switch (attrtype) {
3965        case IFLA_INET6_STATS:
3966                __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3967                                     IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3968                break;
3969        case IFLA_INET6_ICMP6STATS:
3970                __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3971                break;
3972        }
3973}
3974
3975static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3976{
3977        struct nlattr *nla;
3978        struct ifla_cacheinfo ci;
3979
3980        if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3981                goto nla_put_failure;
3982        ci.max_reasm_len = IPV6_MAXPLEN;
3983        ci.tstamp = cstamp_delta(idev->tstamp);
3984        ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3985        ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3986        if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3987                goto nla_put_failure;
3988        nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3989        if (nla == NULL)
3990                goto nla_put_failure;
3991        ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3992
3993        /* XXX - MC not implemented */
3994
3995        nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3996        if (nla == NULL)
3997                goto nla_put_failure;
3998        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3999
4000        nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4001        if (nla == NULL)
4002                goto nla_put_failure;
4003        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4004
4005        return 0;
4006
4007nla_put_failure:
4008        return -EMSGSIZE;
4009}
4010
4011static size_t inet6_get_link_af_size(const struct net_device *dev)
4012{
4013        if (!__in6_dev_get(dev))
4014                return 0;
4015
4016        return inet6_ifla6_size();
4017}
4018
4019static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4020{
4021        struct inet6_dev *idev = __in6_dev_get(dev);
4022
4023        if (!idev)
4024                return -ENODATA;
4025
4026        if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4027                return -EMSGSIZE;
4028
4029        return 0;
4030}
4031
4032static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4033                             u32 pid, u32 seq, int event, unsigned int flags)
4034{
4035        struct net_device *dev = idev->dev;
4036        struct ifinfomsg *hdr;
4037        struct nlmsghdr *nlh;
4038        void *protoinfo;
4039
4040        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4041        if (nlh == NULL)
4042                return -EMSGSIZE;
4043
4044        hdr = nlmsg_data(nlh);
4045        hdr->ifi_family = AF_INET6;
4046        hdr->__ifi_pad = 0;
4047        hdr->ifi_type = dev->type;
4048        hdr->ifi_index = dev->ifindex;
4049        hdr->ifi_flags = dev_get_flags(dev);
4050        hdr->ifi_change = 0;
4051
4052        if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4053            (dev->addr_len &&
4054             nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4055            nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4056            (dev->ifindex != dev->iflink &&
4057             nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4058                goto nla_put_failure;
4059        protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4060        if (protoinfo == NULL)
4061                goto nla_put_failure;
4062
4063        if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4064                goto nla_put_failure;
4065
4066        nla_nest_end(skb, protoinfo);
4067        return nlmsg_end(skb, nlh);
4068
4069nla_put_failure:
4070        nlmsg_cancel(skb, nlh);
4071        return -EMSGSIZE;
4072}
4073
4074static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4075{
4076        struct net *net = sock_net(skb->sk);
4077        int h, s_h;
4078        int idx = 0, s_idx;
4079        struct net_device *dev;
4080        struct inet6_dev *idev;
4081        struct hlist_head *head;
4082        struct hlist_node *node;
4083
4084        s_h = cb->args[0];
4085        s_idx = cb->args[1];
4086
4087        rcu_read_lock();
4088        for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4089                idx = 0;
4090                head = &net->dev_index_head[h];
4091                hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4092                        if (idx < s_idx)
4093                                goto cont;
4094                        idev = __in6_dev_get(dev);
4095                        if (!idev)
4096                                goto cont;
4097                        if (inet6_fill_ifinfo(skb, idev,
4098                                              NETLINK_CB(cb->skb).pid,
4099                                              cb->nlh->nlmsg_seq,
4100                                              RTM_NEWLINK, NLM_F_MULTI) <= 0)
4101                                goto out;
4102cont:
4103                        idx++;
4104                }
4105        }
4106out:
4107        rcu_read_unlock();
4108        cb->args[1] = idx;
4109        cb->args[0] = h;
4110
4111        return skb->len;
4112}
4113
4114void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4115{
4116        struct sk_buff *skb;
4117        struct net *net = dev_net(idev->dev);
4118        int err = -ENOBUFS;
4119
4120        skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4121        if (skb == NULL)
4122                goto errout;
4123
4124        err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4125        if (err < 0) {
4126                /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4127                WARN_ON(err == -EMSGSIZE);
4128                kfree_skb(skb);
4129                goto errout;
4130        }
4131        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4132        return;
4133errout:
4134        if (err < 0)
4135                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4136}
4137
4138static inline size_t inet6_prefix_nlmsg_size(void)
4139{
4140        return NLMSG_ALIGN(sizeof(struct prefixmsg))
4141               + nla_total_size(sizeof(struct in6_addr))
4142               + nla_total_size(sizeof(struct prefix_cacheinfo));
4143}
4144
4145static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4146                             struct prefix_info *pinfo, u32 pid, u32 seq,
4147                             int event, unsigned int flags)
4148{
4149        struct prefixmsg *pmsg;
4150        struct nlmsghdr *nlh;
4151        struct prefix_cacheinfo ci;
4152
4153        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4154        if (nlh == NULL)
4155                return -EMSGSIZE;
4156
4157        pmsg = nlmsg_data(nlh);
4158        pmsg->prefix_family = AF_INET6;
4159        pmsg->prefix_pad1 = 0;
4160        pmsg->prefix_pad2 = 0;
4161        pmsg->prefix_ifindex = idev->dev->ifindex;
4162        pmsg->prefix_len = pinfo->prefix_len;
4163        pmsg->prefix_type = pinfo->type;
4164        pmsg->prefix_pad3 = 0;
4165        pmsg->prefix_flags = 0;
4166        if (pinfo->onlink)
4167                pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4168        if (pinfo->autoconf)
4169                pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4170
4171        if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4172                goto nla_put_failure;
4173        ci.preferred_time = ntohl(pinfo->prefered);
4174        ci.valid_time = ntohl(pinfo->valid);
4175        if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4176                goto nla_put_failure;
4177        return nlmsg_end(skb, nlh);
4178
4179nla_put_failure:
4180        nlmsg_cancel(skb, nlh);
4181        return -EMSGSIZE;
4182}
4183
4184static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4185                         struct prefix_info *pinfo)
4186{
4187        struct sk_buff *skb;
4188        struct net *net = dev_net(idev->dev);
4189        int err = -ENOBUFS;
4190
4191        skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4192        if (skb == NULL)
4193                goto errout;
4194
4195        err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4196        if (err < 0) {
4197                /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4198                WARN_ON(err == -EMSGSIZE);
4199                kfree_skb(skb);
4200                goto errout;
4201        }
4202        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4203        return;
4204errout:
4205        if (err < 0)
4206                rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4207}
4208
4209static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4210{
4211        inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4212
4213        switch (event) {
4214        case RTM_NEWADDR:
4215                /*
4216                 * If the address was optimistic
4217                 * we inserted the route at the start of
4218                 * our DAD process, so we don't need
4219                 * to do it again
4220                 */
4221                if (!(ifp->rt->rt6i_node))
4222                        ip6_ins_rt(ifp->rt);
4223                if (ifp->idev->cnf.forwarding)
4224                        addrconf_join_anycast(ifp);
4225                break;
4226        case RTM_DELADDR:
4227                if (ifp->idev->cnf.forwarding)
4228                        addrconf_leave_anycast(ifp);
4229                addrconf_leave_solict(ifp->idev, &ifp->addr);
4230                dst_hold(&ifp->rt->dst);
4231
4232                if (ip6_del_rt(ifp->rt))
4233                        dst_free(&ifp->rt->dst);
4234                break;
4235        }
4236}
4237
4238static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4239{
4240        rcu_read_lock_bh();
4241        if (likely(ifp->idev->dead == 0))
4242                __ipv6_ifa_notify(event, ifp);
4243        rcu_read_unlock_bh();
4244}
4245
4246#ifdef CONFIG_SYSCTL
4247
4248static
4249int addrconf_sysctl_forward(ctl_table *ctl, int write,
4250                           void __user *buffer, size_t *lenp, loff_t *ppos)
4251{
4252        int *valp = ctl->data;
4253        int val = *valp;
4254        loff_t pos = *ppos;
4255        ctl_table lctl;
4256        int ret;
4257
4258        /*
4259         * ctl->data points to idev->cnf.forwarding, we should
4260         * not modify it until we get the rtnl lock.
4261         */
4262        lctl = *ctl;
4263        lctl.data = &val;
4264
4265        ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4266
4267        if (write)
4268                ret = addrconf_fixup_forwarding(ctl, valp, val);
4269        if (ret)
4270                *ppos = pos;
4271        return ret;
4272}
4273
4274static void dev_disable_change(struct inet6_dev *idev)
4275{
4276        if (!idev || !idev->dev)
4277                return;
4278
4279        if (idev->cnf.disable_ipv6)
4280                addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4281        else
4282                addrconf_notify(NULL, NETDEV_UP, idev->dev);
4283}
4284
4285static void addrconf_disable_change(struct net *net, __s32 newf)
4286{
4287        struct net_device *dev;
4288        struct inet6_dev *idev;
4289
4290        rcu_read_lock();
4291        for_each_netdev_rcu(net, dev) {
4292                idev = __in6_dev_get(dev);
4293                if (idev) {
4294                        int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4295                        idev->cnf.disable_ipv6 = newf;
4296                        if (changed)
4297                                dev_disable_change(idev);
4298                }
4299        }
4300        rcu_read_unlock();
4301}
4302
4303static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4304{
4305        struct net *net;
4306        int old;
4307
4308        if (!rtnl_trylock())
4309                return restart_syscall();
4310
4311        net = (struct net *)table->extra2;
4312        old = *p;
4313        *p = newf;
4314
4315        if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4316                rtnl_unlock();
4317                return 0;
4318        }
4319
4320        if (p == &net->ipv6.devconf_all->disable_ipv6) {
4321                net->ipv6.devconf_dflt->disable_ipv6 = newf;
4322                addrconf_disable_change(net, newf);
4323        } else if ((!newf) ^ (!old))
4324                dev_disable_change((struct inet6_dev *)table->extra1);
4325
4326        rtnl_unlock();
4327        return 0;
4328}
4329
4330static
4331int addrconf_sysctl_disable(ctl_table *ctl, int write,
4332                            void __user *buffer, size_t *lenp, loff_t *ppos)
4333{
4334        int *valp = ctl->data;
4335        int val = *valp;
4336        loff_t pos = *ppos;
4337        ctl_table lctl;
4338        int ret;
4339
4340        /*
4341         * ctl->data points to idev->cnf.disable_ipv6, we should
4342         * not modify it until we get the rtnl lock.
4343         */
4344        lctl = *ctl;
4345        lctl.data = &val;
4346
4347        ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4348
4349        if (write)
4350                ret = addrconf_disable_ipv6(ctl, valp, val);
4351        if (ret)
4352                *ppos = pos;
4353        return ret;
4354}
4355
4356static struct addrconf_sysctl_table
4357{
4358        struct ctl_table_header *sysctl_header;
4359        ctl_table addrconf_vars[DEVCONF_MAX+1];
4360} addrconf_sysctl __read_mostly = {
4361        .sysctl_header = NULL,
4362        .addrconf_vars = {
4363                {
4364                        .procname       = "forwarding",
4365                        .data           = &ipv6_devconf.forwarding,
4366                        .maxlen         = sizeof(int),
4367                        .mode           = 0644,
4368                        .proc_handler   = addrconf_sysctl_forward,
4369                },
4370                {
4371                        .procname       = "hop_limit",
4372                        .data           = &ipv6_devconf.hop_limit,
4373                        .maxlen         = sizeof(int),
4374                        .mode           = 0644,
4375                        .proc_handler   = proc_dointvec,
4376                },
4377                {
4378                        .procname       = "mtu",
4379                        .data           = &ipv6_devconf.mtu6,
4380                        .maxlen         = sizeof(int),
4381                        .mode           = 0644,
4382                        .proc_handler   = proc_dointvec,
4383                },
4384                {
4385                        .procname       = "accept_ra",
4386                        .data           = &ipv6_devconf.accept_ra,
4387                        .maxlen         = sizeof(int),
4388                        .mode           = 0644,
4389                        .proc_handler   = proc_dointvec,
4390                },
4391                {
4392                        .procname       = "accept_redirects",
4393                        .data           = &ipv6_devconf.accept_redirects,
4394                        .maxlen         = sizeof(int),
4395                        .mode           = 0644,
4396                        .proc_handler   = proc_dointvec,
4397                },
4398                {
4399                        .procname       = "autoconf",
4400                        .data           = &ipv6_devconf.autoconf,
4401                        .maxlen         = sizeof(int),
4402                        .mode           = 0644,
4403                        .proc_handler   = proc_dointvec,
4404                },
4405                {
4406                        .procname       = "dad_transmits",
4407                        .data           = &ipv6_devconf.dad_transmits,
4408                        .maxlen         = sizeof(int),
4409                        .mode           = 0644,
4410                        .proc_handler   = proc_dointvec,
4411                },
4412                {
4413                        .procname       = "router_solicitations",
4414                        .data           = &ipv6_devconf.rtr_solicits,
4415                        .maxlen         = sizeof(int),
4416                        .mode           = 0644,
4417                        .proc_handler   = proc_dointvec,
4418                },
4419                {
4420                        .procname       = "router_solicitation_interval",
4421                        .data           = &ipv6_devconf.rtr_solicit_interval,
4422                        .maxlen         = sizeof(int),
4423                        .mode           = 0644,
4424                        .proc_handler   = proc_dointvec_jiffies,
4425                },
4426                {
4427                        .procname       = "router_solicitation_delay",
4428                        .data           = &ipv6_devconf.rtr_solicit_delay,
4429                        .maxlen         = sizeof(int),
4430                        .mode           = 0644,
4431                        .proc_handler   = proc_dointvec_jiffies,
4432                },
4433                {
4434                        .procname       = "force_mld_version",
4435                        .data           = &ipv6_devconf.force_mld_version,
4436                        .maxlen         = sizeof(int),
4437                        .mode           = 0644,
4438                        .proc_handler   = proc_dointvec,
4439                },
4440#ifdef CONFIG_IPV6_PRIVACY
4441                {
4442                        .procname       = "use_tempaddr",
4443                        .data           = &ipv6_devconf.use_tempaddr,
4444                        .maxlen         = sizeof(int),
4445                        .mode           = 0644,
4446                        .proc_handler   = proc_dointvec,
4447                },
4448                {
4449                        .procname       = "temp_valid_lft",
4450                        .data           = &ipv6_devconf.temp_valid_lft,
4451                        .maxlen         = sizeof(int),
4452                        .mode           = 0644,
4453                        .proc_handler   = proc_dointvec,
4454                },
4455                {
4456                        .procname       = "temp_prefered_lft",
4457                        .data           = &ipv6_devconf.temp_prefered_lft,
4458                        .maxlen         = sizeof(int),
4459                        .mode           = 0644,
4460                        .proc_handler   = proc_dointvec,
4461                },
4462                {
4463                        .procname       = "regen_max_retry",
4464                        .data           = &ipv6_devconf.regen_max_retry,
4465                        .maxlen         = sizeof(int),
4466                        .mode           = 0644,
4467                        .proc_handler   = proc_dointvec,
4468                },
4469                {
4470                        .procname       = "max_desync_factor",
4471                        .data           = &ipv6_devconf.max_desync_factor,
4472                        .maxlen         = sizeof(int),
4473                        .mode           = 0644,
4474                        .proc_handler   = proc_dointvec,
4475                },
4476#endif
4477                {
4478                        .procname       = "max_addresses",
4479                        .data           = &ipv6_devconf.max_addresses,
4480                        .maxlen         = sizeof(int),
4481                        .mode           = 0644,
4482                        .proc_handler   = proc_dointvec,
4483                },
4484                {
4485                        .procname       = "accept_ra_defrtr",
4486                        .data           = &ipv6_devconf.accept_ra_defrtr,
4487                        .maxlen         = sizeof(int),
4488                        .mode           = 0644,
4489                        .proc_handler   = proc_dointvec,
4490                },
4491                {
4492                        .procname       = "accept_ra_pinfo",
4493                        .data           = &ipv6_devconf.accept_ra_pinfo,
4494                        .maxlen         = sizeof(int),
4495                        .mode           = 0644,
4496                        .proc_handler   = proc_dointvec,
4497                },
4498#ifdef CONFIG_IPV6_ROUTER_PREF
4499                {
4500                        .procname       = "accept_ra_rtr_pref",
4501                        .data           = &ipv6_devconf.accept_ra_rtr_pref,
4502                        .maxlen         = sizeof(int),
4503                        .mode           = 0644,
4504                        .proc_handler   = proc_dointvec,
4505                },
4506                {
4507                        .procname       = "router_probe_interval",
4508                        .data           = &ipv6_devconf.rtr_probe_interval,
4509                        .maxlen         = sizeof(int),
4510                        .mode           = 0644,
4511                        .proc_handler   = proc_dointvec_jiffies,
4512                },
4513#ifdef CONFIG_IPV6_ROUTE_INFO
4514                {
4515                        .procname       = "accept_ra_rt_info_max_plen",
4516                        .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4517                        .maxlen         = sizeof(int),
4518                        .mode           = 0644,
4519                        .proc_handler   = proc_dointvec,
4520                },
4521#endif
4522#endif
4523                {
4524                        .procname       = "proxy_ndp",
4525                        .data           = &ipv6_devconf.proxy_ndp,
4526                        .maxlen         = sizeof(int),
4527                        .mode           = 0644,
4528                        .proc_handler   = proc_dointvec,
4529                },
4530                {
4531                        .procname       = "accept_source_route",
4532                        .data           = &ipv6_devconf.accept_source_route,
4533                        .maxlen         = sizeof(int),
4534                        .mode           = 0644,
4535                        .proc_handler   = proc_dointvec,
4536                },
4537#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4538                {
4539                        .procname       = "optimistic_dad",
4540                        .data           = &ipv6_devconf.optimistic_dad,
4541                        .maxlen         = sizeof(int),
4542                        .mode           = 0644,
4543                        .proc_handler   = proc_dointvec,
4544
4545                },
4546#endif
4547#ifdef CONFIG_IPV6_MROUTE
4548                {
4549                        .procname       = "mc_forwarding",
4550                        .data           = &ipv6_devconf.mc_forwarding,
4551                        .maxlen         = sizeof(int),
4552                        .mode           = 0444,
4553                        .proc_handler   = proc_dointvec,
4554                },
4555#endif
4556                {
4557                        .procname       = "disable_ipv6",
4558                        .data           = &ipv6_devconf.disable_ipv6,
4559                        .maxlen         = sizeof(int),
4560                        .mode           = 0644,
4561                        .proc_handler   = addrconf_sysctl_disable,
4562                },
4563                {
4564                        .procname       = "accept_dad",
4565                        .data           = &ipv6_devconf.accept_dad,
4566                        .maxlen         = sizeof(int),
4567                        .mode           = 0644,
4568                        .proc_handler   = proc_dointvec,
4569                },
4570                {
4571                        .procname       = "force_tllao",
4572                        .data           = &ipv6_devconf.force_tllao,
4573                        .maxlen         = sizeof(int),
4574                        .mode           = 0644,
4575                        .proc_handler   = proc_dointvec
4576                },
4577                {
4578                        /* sentinel */
4579                }
4580        },
4581};
4582
4583static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4584                struct inet6_dev *idev, struct ipv6_devconf *p)
4585{
4586        int i;
4587        struct addrconf_sysctl_table *t;
4588        char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4589
4590        t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4591        if (t == NULL)
4592                goto out;
4593
4594        for (i = 0; t->addrconf_vars[i].data; i++) {
4595                t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4596                t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4597                t->addrconf_vars[i].extra2 = net;
4598        }
4599
4600        snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4601
4602        t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4603        if (t->sysctl_header == NULL)
4604                goto free;
4605
4606        p->sysctl = t;
4607        return 0;
4608
4609free:
4610        kfree(t);
4611out:
4612        return -ENOBUFS;
4613}
4614
4615static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4616{
4617        struct addrconf_sysctl_table *t;
4618
4619        if (p->sysctl == NULL)
4620                return;
4621
4622        t = p->sysctl;
4623        p->sysctl = NULL;
4624        unregister_net_sysctl_table(t->sysctl_header);
4625        kfree(t);
4626}
4627
4628static void addrconf_sysctl_register(struct inet6_dev *idev)
4629{
4630        neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4631                              &ndisc_ifinfo_sysctl_change);
4632        __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4633                                        idev, &idev->cnf);
4634}
4635
4636static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4637{
4638        __addrconf_sysctl_unregister(&idev->cnf);
4639        neigh_sysctl_unregister(idev->nd_parms);
4640}
4641
4642
4643#endif
4644
4645static int __net_init addrconf_init_net(struct net *net)
4646{
4647        int err;
4648        struct ipv6_devconf *all, *dflt;
4649
4650        err = -ENOMEM;
4651        all = &ipv6_devconf;
4652        dflt = &ipv6_devconf_dflt;
4653
4654        if (!net_eq(net, &init_net)) {
4655                all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4656                if (all == NULL)
4657                        goto err_alloc_all;
4658
4659                dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4660                if (dflt == NULL)
4661                        goto err_alloc_dflt;
4662        } else {
4663                /* these will be inherited by all namespaces */
4664                dflt->autoconf = ipv6_defaults.autoconf;
4665                dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4666        }
4667
4668        net->ipv6.devconf_all = all;
4669        net->ipv6.devconf_dflt = dflt;
4670
4671#ifdef CONFIG_SYSCTL
4672        err = __addrconf_sysctl_register(net, "all", NULL, all);
4673        if (err < 0)
4674                goto err_reg_all;
4675
4676        err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4677        if (err < 0)
4678                goto err_reg_dflt;
4679#endif
4680        return 0;
4681
4682#ifdef CONFIG_SYSCTL
4683err_reg_dflt:
4684        __addrconf_sysctl_unregister(all);
4685err_reg_all:
4686        kfree(dflt);
4687#endif
4688err_alloc_dflt:
4689        kfree(all);
4690err_alloc_all:
4691        return err;
4692}
4693
4694static void __net_exit addrconf_exit_net(struct net *net)
4695{
4696#ifdef CONFIG_SYSCTL
4697        __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4698        __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4699#endif
4700        if (!net_eq(net, &init_net)) {
4701                kfree(net->ipv6.devconf_dflt);
4702                kfree(net->ipv6.devconf_all);
4703        }
4704}
4705
4706static struct pernet_operations addrconf_ops = {
4707        .init = addrconf_init_net,
4708        .exit = addrconf_exit_net,
4709};
4710
4711/*
4712 *      Device notifier
4713 */
4714
4715int register_inet6addr_notifier(struct notifier_block *nb)
4716{
4717        return atomic_notifier_chain_register(&inet6addr_chain, nb);
4718}
4719EXPORT_SYMBOL(register_inet6addr_notifier);
4720
4721int unregister_inet6addr_notifier(struct notifier_block *nb)
4722{
4723        return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4724}
4725EXPORT_SYMBOL(unregister_inet6addr_notifier);
4726
4727static struct rtnl_af_ops inet6_ops = {
4728        .family           = AF_INET6,
4729        .fill_link_af     = inet6_fill_link_af,
4730        .get_link_af_size = inet6_get_link_af_size,
4731};
4732
4733/*
4734 *      Init / cleanup code
4735 */
4736
4737int __init addrconf_init(void)
4738{
4739        int i, err;
4740
4741        err = ipv6_addr_label_init();
4742        if (err < 0) {
4743                pr_crit("%s: cannot initialize default policy table: %d\n",
4744                        __func__, err);
4745                goto out;
4746        }
4747
4748        err = register_pernet_subsys(&addrconf_ops);
4749        if (err < 0)
4750                goto out_addrlabel;
4751
4752        /* The addrconf netdev notifier requires that loopback_dev
4753         * has it's ipv6 private information allocated and setup
4754         * before it can bring up and give link-local addresses
4755         * to other devices which are up.
4756         *
4757         * Unfortunately, loopback_dev is not necessarily the first
4758         * entry in the global dev_base list of net devices.  In fact,
4759         * it is likely to be the very last entry on that list.
4760         * So this causes the notifier registry below to try and
4761         * give link-local addresses to all devices besides loopback_dev
4762         * first, then loopback_dev, which cases all the non-loopback_dev
4763         * devices to fail to get a link-local address.
4764         *
4765         * So, as a temporary fix, allocate the ipv6 structure for
4766         * loopback_dev first by hand.
4767         * Longer term, all of the dependencies ipv6 has upon the loopback
4768         * device and it being up should be removed.
4769         */
4770        rtnl_lock();
4771        if (!ipv6_add_dev(init_net.loopback_dev))
4772                err = -ENOMEM;
4773        rtnl_unlock();
4774        if (err)
4775                goto errlo;
4776
4777        for (i = 0; i < IN6_ADDR_HSIZE; i++)
4778                INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4779
4780        register_netdevice_notifier(&ipv6_dev_notf);
4781
4782        addrconf_verify(0);
4783
4784        err = rtnl_af_register(&inet6_ops);
4785        if (err < 0)
4786                goto errout_af;
4787
4788        err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4789                              NULL);
4790        if (err < 0)
4791                goto errout;
4792
4793        /* Only the first call to __rtnl_register can fail */
4794        __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4795        __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4796        __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4797                        inet6_dump_ifaddr, NULL);
4798        __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4799                        inet6_dump_ifmcaddr, NULL);
4800        __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4801                        inet6_dump_ifacaddr, NULL);
4802
4803        ipv6_addr_label_rtnl_register();
4804
4805        return 0;
4806errout:
4807        rtnl_af_unregister(&inet6_ops);
4808errout_af:
4809        unregister_netdevice_notifier(&ipv6_dev_notf);
4810errlo:
4811        unregister_pernet_subsys(&addrconf_ops);
4812out_addrlabel:
4813        ipv6_addr_label_cleanup();
4814out:
4815        return err;
4816}
4817
4818void addrconf_cleanup(void)
4819{
4820        struct net_device *dev;
4821        int i;
4822
4823        unregister_netdevice_notifier(&ipv6_dev_notf);
4824        unregister_pernet_subsys(&addrconf_ops);
4825        ipv6_addr_label_cleanup();
4826
4827        rtnl_lock();
4828
4829        __rtnl_af_unregister(&inet6_ops);
4830
4831        /* clean dev list */
4832        for_each_netdev(&init_net, dev) {
4833                if (__in6_dev_get(dev) == NULL)
4834                        continue;
4835                addrconf_ifdown(dev, 1);
4836        }
4837        addrconf_ifdown(init_net.loopback_dev, 2);
4838
4839        /*
4840         *      Check hash table.
4841         */
4842        spin_lock_bh(&addrconf_hash_lock);
4843        for (i = 0; i < IN6_ADDR_HSIZE; i++)
4844                WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4845        spin_unlock_bh(&addrconf_hash_lock);
4846
4847        del_timer(&addr_chk_timer);
4848        rtnl_unlock();
4849}
4850
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