linux/net/ipv6/addrconf.c
<<
>>
Prefs
   1/*
   2 *      IPv6 Address [auto]configuration
   3 *      Linux INET6 implementation
   4 *
   5 *      Authors:
   6 *      Pedro Roque             <roque@di.fc.ul.pt>
   7 *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8 *
   9 *      This program is free software; you can redistribute it and/or
  10 *      modify it under the terms of the GNU General Public License
  11 *      as published by the Free Software Foundation; either version
  12 *      2 of the License, or (at your option) any later version.
  13 */
  14
  15/*
  16 *      Changes:
  17 *
  18 *      Janos Farkas                    :       delete timer on ifdown
  19 *      <chexum@bankinf.banki.hu>
  20 *      Andi Kleen                      :       kill double kfree on module
  21 *                                              unload.
  22 *      Maciej W. Rozycki               :       FDDI support
  23 *      sekiya@USAGI                    :       Don't send too many RS
  24 *                                              packets.
  25 *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26 *                                              packets.
  27 *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28 *                                              address validation timer.
  29 *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30 *                                              support.
  31 *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32 *                                              address on a same interface.
  33 *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34 *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35 *                                              seq_file.
  36 *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37 *                                              selection; consider scope,
  38 *                                              status etc.
  39 */
  40
  41#include <linux/errno.h>
  42#include <linux/types.h>
  43#include <linux/kernel.h>
  44#include <linux/socket.h>
  45#include <linux/sockios.h>
  46#include <linux/net.h>
  47#include <linux/in6.h>
  48#include <linux/netdevice.h>
  49#include <linux/if_addr.h>
  50#include <linux/if_arp.h>
  51#include <linux/if_arcnet.h>
  52#include <linux/if_infiniband.h>
  53#include <linux/route.h>
  54#include <linux/inetdevice.h>
  55#include <linux/init.h>
  56#include <linux/slab.h>
  57#ifdef CONFIG_SYSCTL
  58#include <linux/sysctl.h>
  59#endif
  60#include <linux/capability.h>
  61#include <linux/delay.h>
  62#include <linux/notifier.h>
  63#include <linux/string.h>
  64
  65#include <net/net_namespace.h>
  66#include <net/sock.h>
  67#include <net/snmp.h>
  68
  69#include <net/ipv6.h>
  70#include <net/protocol.h>
  71#include <net/ndisc.h>
  72#include <net/ip6_route.h>
  73#include <net/addrconf.h>
  74#include <net/tcp.h>
  75#include <net/ip.h>
  76#include <net/netlink.h>
  77#include <net/pkt_sched.h>
  78#include <linux/if_tunnel.h>
  79#include <linux/rtnetlink.h>
  80
  81#ifdef CONFIG_IPV6_PRIVACY
  82#include <linux/random.h>
  83#endif
  84
  85#include <linux/uaccess.h>
  86#include <asm/unaligned.h>
  87
  88#include <linux/proc_fs.h>
  89#include <linux/seq_file.h>
  90
  91/* Set to 3 to get tracing... */
  92#define ACONF_DEBUG 2
  93
  94#if ACONF_DEBUG >= 3
  95#define ADBG(x) printk x
  96#else
  97#define ADBG(x)
  98#endif
  99
 100#define INFINITY_LIFE_TIME      0xFFFFFFFF
 101
 102static inline u32 cstamp_delta(unsigned long cstamp)
 103{
 104        return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 105}
 106
 107#define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
 108#define ADDRCONF_TIMER_FUZZ             (HZ / 4)
 109#define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
 110
 111#ifdef CONFIG_SYSCTL
 112static void addrconf_sysctl_register(struct inet6_dev *idev);
 113static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 114#else
 115static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 116{
 117}
 118
 119static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 120{
 121}
 122#endif
 123
 124#ifdef CONFIG_IPV6_PRIVACY
 125static int __ipv6_regen_rndid(struct inet6_dev *idev);
 126static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 127static void ipv6_regen_rndid(unsigned long data);
 128#endif
 129
 130static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 131static int ipv6_count_addresses(struct inet6_dev *idev);
 132
 133/*
 134 *      Configured unicast address hash table
 135 */
 136static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 137static DEFINE_SPINLOCK(addrconf_hash_lock);
 138
 139static void addrconf_verify(unsigned long);
 140
 141static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 142static DEFINE_SPINLOCK(addrconf_verify_lock);
 143
 144static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 145static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 146
 147static void addrconf_type_change(struct net_device *dev,
 148                                 unsigned long event);
 149static int addrconf_ifdown(struct net_device *dev, int how);
 150
 151static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 152static void addrconf_dad_timer(unsigned long data);
 153static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 154static void addrconf_dad_run(struct inet6_dev *idev);
 155static void addrconf_rs_timer(unsigned long data);
 156static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 157static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 158
 159static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 160                                struct prefix_info *pinfo);
 161static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 162                               struct net_device *dev);
 163
 164static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 165
 166static struct ipv6_devconf ipv6_devconf __read_mostly = {
 167        .forwarding             = 0,
 168        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 169        .mtu6                   = IPV6_MIN_MTU,
 170        .accept_ra              = 1,
 171        .accept_redirects       = 1,
 172        .autoconf               = 1,
 173        .force_mld_version      = 0,
 174        .dad_transmits          = 1,
 175        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 176        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 177        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 178#ifdef CONFIG_IPV6_PRIVACY
 179        .use_tempaddr           = 0,
 180        .temp_valid_lft         = TEMP_VALID_LIFETIME,
 181        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 182        .regen_max_retry        = REGEN_MAX_RETRY,
 183        .max_desync_factor      = MAX_DESYNC_FACTOR,
 184#endif
 185        .max_addresses          = IPV6_MAX_ADDRESSES,
 186        .accept_ra_defrtr       = 1,
 187        .accept_ra_pinfo        = 1,
 188#ifdef CONFIG_IPV6_ROUTER_PREF
 189        .accept_ra_rtr_pref     = 1,
 190        .rtr_probe_interval     = 60 * HZ,
 191#ifdef CONFIG_IPV6_ROUTE_INFO
 192        .accept_ra_rt_info_max_plen = 0,
 193#endif
 194#endif
 195        .proxy_ndp              = 0,
 196        .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 197        .disable_ipv6           = 0,
 198        .accept_dad             = 1,
 199};
 200
 201static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 202        .forwarding             = 0,
 203        .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 204        .mtu6                   = IPV6_MIN_MTU,
 205        .accept_ra              = 1,
 206        .accept_redirects       = 1,
 207        .autoconf               = 1,
 208        .dad_transmits          = 1,
 209        .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 210        .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 211        .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 212#ifdef CONFIG_IPV6_PRIVACY
 213        .use_tempaddr           = 0,
 214        .temp_valid_lft         = TEMP_VALID_LIFETIME,
 215        .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 216        .regen_max_retry        = REGEN_MAX_RETRY,
 217        .max_desync_factor      = MAX_DESYNC_FACTOR,
 218#endif
 219        .max_addresses          = IPV6_MAX_ADDRESSES,
 220        .accept_ra_defrtr       = 1,
 221        .accept_ra_pinfo        = 1,
 222#ifdef CONFIG_IPV6_ROUTER_PREF
 223        .accept_ra_rtr_pref     = 1,
 224        .rtr_probe_interval     = 60 * HZ,
 225#ifdef CONFIG_IPV6_ROUTE_INFO
 226        .accept_ra_rt_info_max_plen = 0,
 227#endif
 228#endif
 229        .proxy_ndp              = 0,
 230        .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 231        .disable_ipv6           = 0,
 232        .accept_dad             = 1,
 233};
 234
 235/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 236const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 237const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 238const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 239const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 240
 241/* Check if a valid qdisc is available */
 242static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 243{
 244        return !qdisc_tx_is_noop(dev);
 245}
 246
 247/* Check if a route is valid prefix route */
 248static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 249{
 250        return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
 251}
 252
 253static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 254{
 255        if (del_timer(&ifp->timer))
 256                __in6_ifa_put(ifp);
 257}
 258
 259enum addrconf_timer_t {
 260        AC_NONE,
 261        AC_DAD,
 262        AC_RS,
 263};
 264
 265static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 266                               enum addrconf_timer_t what,
 267                               unsigned long when)
 268{
 269        if (!del_timer(&ifp->timer))
 270                in6_ifa_hold(ifp);
 271
 272        switch (what) {
 273        case AC_DAD:
 274                ifp->timer.function = addrconf_dad_timer;
 275                break;
 276        case AC_RS:
 277                ifp->timer.function = addrconf_rs_timer;
 278                break;
 279        default:
 280                break;
 281        }
 282        ifp->timer.expires = jiffies + when;
 283        add_timer(&ifp->timer);
 284}
 285
 286static int snmp6_alloc_dev(struct inet6_dev *idev)
 287{
 288        if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 289                          sizeof(struct ipstats_mib),
 290                          __alignof__(struct ipstats_mib)) < 0)
 291                goto err_ip;
 292        if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
 293                          sizeof(struct icmpv6_mib),
 294                          __alignof__(struct icmpv6_mib)) < 0)
 295                goto err_icmp;
 296        if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
 297                          sizeof(struct icmpv6msg_mib),
 298                          __alignof__(struct icmpv6msg_mib)) < 0)
 299                goto err_icmpmsg;
 300
 301        return 0;
 302
 303err_icmpmsg:
 304        snmp_mib_free((void __percpu **)idev->stats.icmpv6);
 305err_icmp:
 306        snmp_mib_free((void __percpu **)idev->stats.ipv6);
 307err_ip:
 308        return -ENOMEM;
 309}
 310
 311static void snmp6_free_dev(struct inet6_dev *idev)
 312{
 313        snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
 314        snmp_mib_free((void __percpu **)idev->stats.icmpv6);
 315        snmp_mib_free((void __percpu **)idev->stats.ipv6);
 316}
 317
 318/* Nobody refers to this device, we may destroy it. */
 319
 320static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 321{
 322        struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 323        kfree(idev);
 324}
 325
 326void in6_dev_finish_destroy(struct inet6_dev *idev)
 327{
 328        struct net_device *dev = idev->dev;
 329
 330        WARN_ON(!list_empty(&idev->addr_list));
 331        WARN_ON(idev->mc_list != NULL);
 332
 333#ifdef NET_REFCNT_DEBUG
 334        printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 335#endif
 336        dev_put(dev);
 337        if (!idev->dead) {
 338                pr_warning("Freeing alive inet6 device %p\n", idev);
 339                return;
 340        }
 341        snmp6_free_dev(idev);
 342        call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 343}
 344
 345EXPORT_SYMBOL(in6_dev_finish_destroy);
 346
 347static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 348{
 349        struct inet6_dev *ndev;
 350
 351        ASSERT_RTNL();
 352
 353        if (dev->mtu < IPV6_MIN_MTU)
 354                return NULL;
 355
 356        ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 357
 358        if (ndev == NULL)
 359                return NULL;
 360
 361        rwlock_init(&ndev->lock);
 362        ndev->dev = dev;
 363        INIT_LIST_HEAD(&ndev->addr_list);
 364
 365        memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 366        ndev->cnf.mtu6 = dev->mtu;
 367        ndev->cnf.sysctl = NULL;
 368        ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 369        if (ndev->nd_parms == NULL) {
 370                kfree(ndev);
 371                return NULL;
 372        }
 373        if (ndev->cnf.forwarding)
 374                dev_disable_lro(dev);
 375        /* We refer to the device */
 376        dev_hold(dev);
 377
 378        if (snmp6_alloc_dev(ndev) < 0) {
 379                ADBG((KERN_WARNING
 380                        "%s(): cannot allocate memory for statistics; dev=%s.\n",
 381                        __func__, dev->name));
 382                neigh_parms_release(&nd_tbl, ndev->nd_parms);
 383                ndev->dead = 1;
 384                in6_dev_finish_destroy(ndev);
 385                return NULL;
 386        }
 387
 388        if (snmp6_register_dev(ndev) < 0) {
 389                ADBG((KERN_WARNING
 390                        "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 391                        __func__, dev->name));
 392                neigh_parms_release(&nd_tbl, ndev->nd_parms);
 393                ndev->dead = 1;
 394                in6_dev_finish_destroy(ndev);
 395                return NULL;
 396        }
 397
 398        /* One reference from device.  We must do this before
 399         * we invoke __ipv6_regen_rndid().
 400         */
 401        in6_dev_hold(ndev);
 402
 403        if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 404                ndev->cnf.accept_dad = -1;
 405
 406#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 407        if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 408                printk(KERN_INFO
 409                       "%s: Disabled Multicast RS\n",
 410                       dev->name);
 411                ndev->cnf.rtr_solicits = 0;
 412        }
 413#endif
 414
 415#ifdef CONFIG_IPV6_PRIVACY
 416        INIT_LIST_HEAD(&ndev->tempaddr_list);
 417        setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 418        if ((dev->flags&IFF_LOOPBACK) ||
 419            dev->type == ARPHRD_TUNNEL ||
 420            dev->type == ARPHRD_TUNNEL6 ||
 421            dev->type == ARPHRD_SIT ||
 422            dev->type == ARPHRD_NONE) {
 423                printk(KERN_INFO
 424                       "%s: Disabled Privacy Extensions\n",
 425                       dev->name);
 426                ndev->cnf.use_tempaddr = -1;
 427        } else {
 428                in6_dev_hold(ndev);
 429                ipv6_regen_rndid((unsigned long) ndev);
 430        }
 431#endif
 432
 433        if (netif_running(dev) && addrconf_qdisc_ok(dev))
 434                ndev->if_flags |= IF_READY;
 435
 436        ipv6_mc_init_dev(ndev);
 437        ndev->tstamp = jiffies;
 438        addrconf_sysctl_register(ndev);
 439        /* protected by rtnl_lock */
 440        rcu_assign_pointer(dev->ip6_ptr, ndev);
 441
 442        /* Join all-node multicast group */
 443        ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 444
 445        return ndev;
 446}
 447
 448static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 449{
 450        struct inet6_dev *idev;
 451
 452        ASSERT_RTNL();
 453
 454        idev = __in6_dev_get(dev);
 455        if (!idev) {
 456                idev = ipv6_add_dev(dev);
 457                if (!idev)
 458                        return NULL;
 459        }
 460
 461        if (dev->flags&IFF_UP)
 462                ipv6_mc_up(idev);
 463        return idev;
 464}
 465
 466#ifdef CONFIG_SYSCTL
 467static void dev_forward_change(struct inet6_dev *idev)
 468{
 469        struct net_device *dev;
 470        struct inet6_ifaddr *ifa;
 471
 472        if (!idev)
 473                return;
 474        dev = idev->dev;
 475        if (idev->cnf.forwarding)
 476                dev_disable_lro(dev);
 477        if (dev && (dev->flags & IFF_MULTICAST)) {
 478                if (idev->cnf.forwarding)
 479                        ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 480                else
 481                        ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 482        }
 483
 484        list_for_each_entry(ifa, &idev->addr_list, if_list) {
 485                if (ifa->flags&IFA_F_TENTATIVE)
 486                        continue;
 487                if (idev->cnf.forwarding)
 488                        addrconf_join_anycast(ifa);
 489                else
 490                        addrconf_leave_anycast(ifa);
 491        }
 492}
 493
 494
 495static void addrconf_forward_change(struct net *net, __s32 newf)
 496{
 497        struct net_device *dev;
 498        struct inet6_dev *idev;
 499
 500        rcu_read_lock();
 501        for_each_netdev_rcu(net, dev) {
 502                idev = __in6_dev_get(dev);
 503                if (idev) {
 504                        int changed = (!idev->cnf.forwarding) ^ (!newf);
 505                        idev->cnf.forwarding = newf;
 506                        if (changed)
 507                                dev_forward_change(idev);
 508                }
 509        }
 510        rcu_read_unlock();
 511}
 512
 513static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 514{
 515        struct net *net;
 516
 517        net = (struct net *)table->extra2;
 518        if (p == &net->ipv6.devconf_dflt->forwarding)
 519                return 0;
 520
 521        if (!rtnl_trylock()) {
 522                /* Restore the original values before restarting */
 523                *p = old;
 524                return restart_syscall();
 525        }
 526
 527        if (p == &net->ipv6.devconf_all->forwarding) {
 528                __s32 newf = net->ipv6.devconf_all->forwarding;
 529                net->ipv6.devconf_dflt->forwarding = newf;
 530                addrconf_forward_change(net, newf);
 531        } else if ((!*p) ^ (!old))
 532                dev_forward_change((struct inet6_dev *)table->extra1);
 533        rtnl_unlock();
 534
 535        if (*p)
 536                rt6_purge_dflt_routers(net);
 537        return 1;
 538}
 539#endif
 540
 541static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
 542{
 543        struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
 544        kfree(ifp);
 545}
 546
 547/* Nobody refers to this ifaddr, destroy it */
 548void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 549{
 550        WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 551
 552#ifdef NET_REFCNT_DEBUG
 553        printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 554#endif
 555
 556        in6_dev_put(ifp->idev);
 557
 558        if (del_timer(&ifp->timer))
 559                pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 560
 561        if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 562                pr_warning("Freeing alive inet6 address %p\n", ifp);
 563                return;
 564        }
 565        dst_release(&ifp->rt->dst);
 566
 567        call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
 568}
 569
 570static void
 571ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 572{
 573        struct list_head *p;
 574        int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 575
 576        /*
 577         * Each device address list is sorted in order of scope -
 578         * global before linklocal.
 579         */
 580        list_for_each(p, &idev->addr_list) {
 581                struct inet6_ifaddr *ifa
 582                        = list_entry(p, struct inet6_ifaddr, if_list);
 583                if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 584                        break;
 585        }
 586
 587        list_add_tail(&ifp->if_list, p);
 588}
 589
 590static u32 ipv6_addr_hash(const struct in6_addr *addr)
 591{
 592        /*
 593         * We perform the hash function over the last 64 bits of the address
 594         * This will include the IEEE address token on links that support it.
 595         */
 596        return jhash_2words((__force u32)addr->s6_addr32[2],
 597                            (__force u32)addr->s6_addr32[3], 0)
 598                & (IN6_ADDR_HSIZE - 1);
 599}
 600
 601/* On success it returns ifp with increased reference count */
 602
 603static struct inet6_ifaddr *
 604ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 605              int scope, u32 flags)
 606{
 607        struct inet6_ifaddr *ifa = NULL;
 608        struct rt6_info *rt;
 609        unsigned int hash;
 610        int err = 0;
 611        int addr_type = ipv6_addr_type(addr);
 612
 613        if (addr_type == IPV6_ADDR_ANY ||
 614            addr_type & IPV6_ADDR_MULTICAST ||
 615            (!(idev->dev->flags & IFF_LOOPBACK) &&
 616             addr_type & IPV6_ADDR_LOOPBACK))
 617                return ERR_PTR(-EADDRNOTAVAIL);
 618
 619        rcu_read_lock_bh();
 620        if (idev->dead) {
 621                err = -ENODEV;                  /*XXX*/
 622                goto out2;
 623        }
 624
 625        if (idev->cnf.disable_ipv6) {
 626                err = -EACCES;
 627                goto out2;
 628        }
 629
 630        spin_lock(&addrconf_hash_lock);
 631
 632        /* Ignore adding duplicate addresses on an interface */
 633        if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 634                ADBG(("ipv6_add_addr: already assigned\n"));
 635                err = -EEXIST;
 636                goto out;
 637        }
 638
 639        ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 640
 641        if (ifa == NULL) {
 642                ADBG(("ipv6_add_addr: malloc failed\n"));
 643                err = -ENOBUFS;
 644                goto out;
 645        }
 646
 647        rt = addrconf_dst_alloc(idev, addr, 0);
 648        if (IS_ERR(rt)) {
 649                err = PTR_ERR(rt);
 650                goto out;
 651        }
 652
 653        ipv6_addr_copy(&ifa->addr, addr);
 654
 655        spin_lock_init(&ifa->lock);
 656        spin_lock_init(&ifa->state_lock);
 657        init_timer(&ifa->timer);
 658        INIT_HLIST_NODE(&ifa->addr_lst);
 659        ifa->timer.data = (unsigned long) ifa;
 660        ifa->scope = scope;
 661        ifa->prefix_len = pfxlen;
 662        ifa->flags = flags | IFA_F_TENTATIVE;
 663        ifa->cstamp = ifa->tstamp = jiffies;
 664
 665        ifa->rt = rt;
 666
 667        /*
 668         * part one of RFC 4429, section 3.3
 669         * We should not configure an address as
 670         * optimistic if we do not yet know the link
 671         * layer address of our nexhop router
 672         */
 673
 674        if (rt->rt6i_nexthop == NULL)
 675                ifa->flags &= ~IFA_F_OPTIMISTIC;
 676
 677        ifa->idev = idev;
 678        in6_dev_hold(idev);
 679        /* For caller */
 680        in6_ifa_hold(ifa);
 681
 682        /* Add to big hash table */
 683        hash = ipv6_addr_hash(addr);
 684
 685        hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 686        spin_unlock(&addrconf_hash_lock);
 687
 688        write_lock(&idev->lock);
 689        /* Add to inet6_dev unicast addr list. */
 690        ipv6_link_dev_addr(idev, ifa);
 691
 692#ifdef CONFIG_IPV6_PRIVACY
 693        if (ifa->flags&IFA_F_TEMPORARY) {
 694                list_add(&ifa->tmp_list, &idev->tempaddr_list);
 695                in6_ifa_hold(ifa);
 696        }
 697#endif
 698
 699        in6_ifa_hold(ifa);
 700        write_unlock(&idev->lock);
 701out2:
 702        rcu_read_unlock_bh();
 703
 704        if (likely(err == 0))
 705                atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 706        else {
 707                kfree(ifa);
 708                ifa = ERR_PTR(err);
 709        }
 710
 711        return ifa;
 712out:
 713        spin_unlock(&addrconf_hash_lock);
 714        goto out2;
 715}
 716
 717/* This function wants to get referenced ifp and releases it before return */
 718
 719static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 720{
 721        struct inet6_ifaddr *ifa, *ifn;
 722        struct inet6_dev *idev = ifp->idev;
 723        int state;
 724        int hash;
 725        int deleted = 0, onlink = 0;
 726        unsigned long expires = jiffies;
 727
 728        hash = ipv6_addr_hash(&ifp->addr);
 729
 730        spin_lock_bh(&ifp->state_lock);
 731        state = ifp->state;
 732        ifp->state = INET6_IFADDR_STATE_DEAD;
 733        spin_unlock_bh(&ifp->state_lock);
 734
 735        if (state == INET6_IFADDR_STATE_DEAD)
 736                goto out;
 737
 738        spin_lock_bh(&addrconf_hash_lock);
 739        hlist_del_init_rcu(&ifp->addr_lst);
 740        spin_unlock_bh(&addrconf_hash_lock);
 741
 742        write_lock_bh(&idev->lock);
 743#ifdef CONFIG_IPV6_PRIVACY
 744        if (ifp->flags&IFA_F_TEMPORARY) {
 745                list_del(&ifp->tmp_list);
 746                if (ifp->ifpub) {
 747                        in6_ifa_put(ifp->ifpub);
 748                        ifp->ifpub = NULL;
 749                }
 750                __in6_ifa_put(ifp);
 751        }
 752#endif
 753
 754        list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 755                if (ifa == ifp) {
 756                        list_del_init(&ifp->if_list);
 757                        __in6_ifa_put(ifp);
 758
 759                        if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 760                                break;
 761                        deleted = 1;
 762                        continue;
 763                } else if (ifp->flags & IFA_F_PERMANENT) {
 764                        if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 765                                              ifp->prefix_len)) {
 766                                if (ifa->flags & IFA_F_PERMANENT) {
 767                                        onlink = 1;
 768                                        if (deleted)
 769                                                break;
 770                                } else {
 771                                        unsigned long lifetime;
 772
 773                                        if (!onlink)
 774                                                onlink = -1;
 775
 776                                        spin_lock(&ifa->lock);
 777
 778                                        lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 779                                        /*
 780                                         * Note: Because this address is
 781                                         * not permanent, lifetime <
 782                                         * LONG_MAX / HZ here.
 783                                         */
 784                                        if (time_before(expires,
 785                                                        ifa->tstamp + lifetime * HZ))
 786                                                expires = ifa->tstamp + lifetime * HZ;
 787                                        spin_unlock(&ifa->lock);
 788                                }
 789                        }
 790                }
 791        }
 792        write_unlock_bh(&idev->lock);
 793
 794        addrconf_del_timer(ifp);
 795
 796        ipv6_ifa_notify(RTM_DELADDR, ifp);
 797
 798        atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 799
 800        /*
 801         * Purge or update corresponding prefix
 802         *
 803         * 1) we don't purge prefix here if address was not permanent.
 804         *    prefix is managed by its own lifetime.
 805         * 2) if there're no addresses, delete prefix.
 806         * 3) if there're still other permanent address(es),
 807         *    corresponding prefix is still permanent.
 808         * 4) otherwise, update prefix lifetime to the
 809         *    longest valid lifetime among the corresponding
 810         *    addresses on the device.
 811         *    Note: subsequent RA will update lifetime.
 812         *
 813         * --yoshfuji
 814         */
 815        if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 816                struct in6_addr prefix;
 817                struct rt6_info *rt;
 818                struct net *net = dev_net(ifp->idev->dev);
 819                ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 820                rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
 821
 822                if (rt && addrconf_is_prefix_route(rt)) {
 823                        if (onlink == 0) {
 824                                ip6_del_rt(rt);
 825                                rt = NULL;
 826                        } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 827                                rt->rt6i_expires = expires;
 828                                rt->rt6i_flags |= RTF_EXPIRES;
 829                        }
 830                }
 831                dst_release(&rt->dst);
 832        }
 833
 834out:
 835        in6_ifa_put(ifp);
 836}
 837
 838#ifdef CONFIG_IPV6_PRIVACY
 839static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 840{
 841        struct inet6_dev *idev = ifp->idev;
 842        struct in6_addr addr, *tmpaddr;
 843        unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
 844        unsigned long regen_advance;
 845        int tmp_plen;
 846        int ret = 0;
 847        int max_addresses;
 848        u32 addr_flags;
 849
 850        write_lock(&idev->lock);
 851        if (ift) {
 852                spin_lock_bh(&ift->lock);
 853                memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 854                spin_unlock_bh(&ift->lock);
 855                tmpaddr = &addr;
 856        } else {
 857                tmpaddr = NULL;
 858        }
 859retry:
 860        in6_dev_hold(idev);
 861        if (idev->cnf.use_tempaddr <= 0) {
 862                write_unlock(&idev->lock);
 863                printk(KERN_INFO
 864                        "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 865                in6_dev_put(idev);
 866                ret = -1;
 867                goto out;
 868        }
 869        spin_lock_bh(&ifp->lock);
 870        if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 871                idev->cnf.use_tempaddr = -1;    /*XXX*/
 872                spin_unlock_bh(&ifp->lock);
 873                write_unlock(&idev->lock);
 874                printk(KERN_WARNING
 875                        "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 876                in6_dev_put(idev);
 877                ret = -1;
 878                goto out;
 879        }
 880        in6_ifa_hold(ifp);
 881        memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 882        if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 883                spin_unlock_bh(&ifp->lock);
 884                write_unlock(&idev->lock);
 885                printk(KERN_WARNING
 886                        "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 887                in6_ifa_put(ifp);
 888                in6_dev_put(idev);
 889                ret = -1;
 890                goto out;
 891        }
 892        memcpy(&addr.s6_addr[8], idev->rndid, 8);
 893        age = (jiffies - ifp->tstamp) / HZ;
 894        tmp_valid_lft = min_t(__u32,
 895                              ifp->valid_lft,
 896                              idev->cnf.temp_valid_lft + age);
 897        tmp_prefered_lft = min_t(__u32,
 898                                 ifp->prefered_lft,
 899                                 idev->cnf.temp_prefered_lft + age -
 900                                 idev->cnf.max_desync_factor);
 901        tmp_plen = ifp->prefix_len;
 902        max_addresses = idev->cnf.max_addresses;
 903        tmp_cstamp = ifp->cstamp;
 904        tmp_tstamp = ifp->tstamp;
 905        spin_unlock_bh(&ifp->lock);
 906
 907        regen_advance = idev->cnf.regen_max_retry *
 908                        idev->cnf.dad_transmits *
 909                        idev->nd_parms->retrans_time / HZ;
 910        write_unlock(&idev->lock);
 911
 912        /* A temporary address is created only if this calculated Preferred
 913         * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 914         * an implementation must not create a temporary address with a zero
 915         * Preferred Lifetime.
 916         */
 917        if (tmp_prefered_lft <= regen_advance) {
 918                in6_ifa_put(ifp);
 919                in6_dev_put(idev);
 920                ret = -1;
 921                goto out;
 922        }
 923
 924        addr_flags = IFA_F_TEMPORARY;
 925        /* set in addrconf_prefix_rcv() */
 926        if (ifp->flags & IFA_F_OPTIMISTIC)
 927                addr_flags |= IFA_F_OPTIMISTIC;
 928
 929        ift = !max_addresses ||
 930              ipv6_count_addresses(idev) < max_addresses ?
 931                ipv6_add_addr(idev, &addr, tmp_plen,
 932                              ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 933                              addr_flags) : NULL;
 934        if (!ift || IS_ERR(ift)) {
 935                in6_ifa_put(ifp);
 936                in6_dev_put(idev);
 937                printk(KERN_INFO
 938                        "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 939                tmpaddr = &addr;
 940                write_lock(&idev->lock);
 941                goto retry;
 942        }
 943
 944        spin_lock_bh(&ift->lock);
 945        ift->ifpub = ifp;
 946        ift->valid_lft = tmp_valid_lft;
 947        ift->prefered_lft = tmp_prefered_lft;
 948        ift->cstamp = tmp_cstamp;
 949        ift->tstamp = tmp_tstamp;
 950        spin_unlock_bh(&ift->lock);
 951
 952        addrconf_dad_start(ift, 0);
 953        in6_ifa_put(ift);
 954        in6_dev_put(idev);
 955out:
 956        return ret;
 957}
 958#endif
 959
 960/*
 961 *      Choose an appropriate source address (RFC3484)
 962 */
 963enum {
 964        IPV6_SADDR_RULE_INIT = 0,
 965        IPV6_SADDR_RULE_LOCAL,
 966        IPV6_SADDR_RULE_SCOPE,
 967        IPV6_SADDR_RULE_PREFERRED,
 968#ifdef CONFIG_IPV6_MIP6
 969        IPV6_SADDR_RULE_HOA,
 970#endif
 971        IPV6_SADDR_RULE_OIF,
 972        IPV6_SADDR_RULE_LABEL,
 973#ifdef CONFIG_IPV6_PRIVACY
 974        IPV6_SADDR_RULE_PRIVACY,
 975#endif
 976        IPV6_SADDR_RULE_ORCHID,
 977        IPV6_SADDR_RULE_PREFIX,
 978        IPV6_SADDR_RULE_MAX
 979};
 980
 981struct ipv6_saddr_score {
 982        int                     rule;
 983        int                     addr_type;
 984        struct inet6_ifaddr     *ifa;
 985        DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 986        int                     scopedist;
 987        int                     matchlen;
 988};
 989
 990struct ipv6_saddr_dst {
 991        const struct in6_addr *addr;
 992        int ifindex;
 993        int scope;
 994        int label;
 995        unsigned int prefs;
 996};
 997
 998static inline int ipv6_saddr_preferred(int type)
 999{
1000        if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1001                return 1;
1002        return 0;
1003}
1004
1005static int ipv6_get_saddr_eval(struct net *net,
1006                               struct ipv6_saddr_score *score,
1007                               struct ipv6_saddr_dst *dst,
1008                               int i)
1009{
1010        int ret;
1011
1012        if (i <= score->rule) {
1013                switch (i) {
1014                case IPV6_SADDR_RULE_SCOPE:
1015                        ret = score->scopedist;
1016                        break;
1017                case IPV6_SADDR_RULE_PREFIX:
1018                        ret = score->matchlen;
1019                        break;
1020                default:
1021                        ret = !!test_bit(i, score->scorebits);
1022                }
1023                goto out;
1024        }
1025
1026        switch (i) {
1027        case IPV6_SADDR_RULE_INIT:
1028                /* Rule 0: remember if hiscore is not ready yet */
1029                ret = !!score->ifa;
1030                break;
1031        case IPV6_SADDR_RULE_LOCAL:
1032                /* Rule 1: Prefer same address */
1033                ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1034                break;
1035        case IPV6_SADDR_RULE_SCOPE:
1036                /* Rule 2: Prefer appropriate scope
1037                 *
1038                 *      ret
1039                 *       ^
1040                 *    -1 |  d 15
1041                 *    ---+--+-+---> scope
1042                 *       |
1043                 *       |             d is scope of the destination.
1044                 *  B-d  |  \
1045                 *       |   \      <- smaller scope is better if
1046                 *  B-15 |    \        if scope is enough for destinaion.
1047                 *       |             ret = B - scope (-1 <= scope >= d <= 15).
1048                 * d-C-1 | /
1049                 *       |/         <- greater is better
1050                 *   -C  /             if scope is not enough for destination.
1051                 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1052                 *
1053                 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1054                 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1055                 * Assume B = 0 and we get C > 29.
1056                 */
1057                ret = __ipv6_addr_src_scope(score->addr_type);
1058                if (ret >= dst->scope)
1059                        ret = -ret;
1060                else
1061                        ret -= 128;     /* 30 is enough */
1062                score->scopedist = ret;
1063                break;
1064        case IPV6_SADDR_RULE_PREFERRED:
1065                /* Rule 3: Avoid deprecated and optimistic addresses */
1066                ret = ipv6_saddr_preferred(score->addr_type) ||
1067                      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1068                break;
1069#ifdef CONFIG_IPV6_MIP6
1070        case IPV6_SADDR_RULE_HOA:
1071            {
1072                /* Rule 4: Prefer home address */
1073                int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1074                ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1075                break;
1076            }
1077#endif
1078        case IPV6_SADDR_RULE_OIF:
1079                /* Rule 5: Prefer outgoing interface */
1080                ret = (!dst->ifindex ||
1081                       dst->ifindex == score->ifa->idev->dev->ifindex);
1082                break;
1083        case IPV6_SADDR_RULE_LABEL:
1084                /* Rule 6: Prefer matching label */
1085                ret = ipv6_addr_label(net,
1086                                      &score->ifa->addr, score->addr_type,
1087                                      score->ifa->idev->dev->ifindex) == dst->label;
1088                break;
1089#ifdef CONFIG_IPV6_PRIVACY
1090        case IPV6_SADDR_RULE_PRIVACY:
1091            {
1092                /* Rule 7: Prefer public address
1093                 * Note: prefer temprary address if use_tempaddr >= 2
1094                 */
1095                int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1096                                !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1097                                score->ifa->idev->cnf.use_tempaddr >= 2;
1098                ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1099                break;
1100            }
1101#endif
1102        case IPV6_SADDR_RULE_ORCHID:
1103                /* Rule 8-: Prefer ORCHID vs ORCHID or
1104                 *          non-ORCHID vs non-ORCHID
1105                 */
1106                ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1107                        ipv6_addr_orchid(dst->addr));
1108                break;
1109        case IPV6_SADDR_RULE_PREFIX:
1110                /* Rule 8: Use longest matching prefix */
1111                score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1112                                                       dst->addr);
1113                break;
1114        default:
1115                ret = 0;
1116        }
1117
1118        if (ret)
1119                __set_bit(i, score->scorebits);
1120        score->rule = i;
1121out:
1122        return ret;
1123}
1124
1125int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1126                       const struct in6_addr *daddr, unsigned int prefs,
1127                       struct in6_addr *saddr)
1128{
1129        struct ipv6_saddr_score scores[2],
1130                                *score = &scores[0], *hiscore = &scores[1];
1131        struct ipv6_saddr_dst dst;
1132        struct net_device *dev;
1133        int dst_type;
1134
1135        dst_type = __ipv6_addr_type(daddr);
1136        dst.addr = daddr;
1137        dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1138        dst.scope = __ipv6_addr_src_scope(dst_type);
1139        dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1140        dst.prefs = prefs;
1141
1142        hiscore->rule = -1;
1143        hiscore->ifa = NULL;
1144
1145        rcu_read_lock();
1146
1147        for_each_netdev_rcu(net, dev) {
1148                struct inet6_dev *idev;
1149
1150                /* Candidate Source Address (section 4)
1151                 *  - multicast and link-local destination address,
1152                 *    the set of candidate source address MUST only
1153                 *    include addresses assigned to interfaces
1154                 *    belonging to the same link as the outgoing
1155                 *    interface.
1156                 * (- For site-local destination addresses, the
1157                 *    set of candidate source addresses MUST only
1158                 *    include addresses assigned to interfaces
1159                 *    belonging to the same site as the outgoing
1160                 *    interface.)
1161                 */
1162                if (((dst_type & IPV6_ADDR_MULTICAST) ||
1163                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1164                    dst.ifindex && dev->ifindex != dst.ifindex)
1165                        continue;
1166
1167                idev = __in6_dev_get(dev);
1168                if (!idev)
1169                        continue;
1170
1171                read_lock_bh(&idev->lock);
1172                list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1173                        int i;
1174
1175                        /*
1176                         * - Tentative Address (RFC2462 section 5.4)
1177                         *  - A tentative address is not considered
1178                         *    "assigned to an interface" in the traditional
1179                         *    sense, unless it is also flagged as optimistic.
1180                         * - Candidate Source Address (section 4)
1181                         *  - In any case, anycast addresses, multicast
1182                         *    addresses, and the unspecified address MUST
1183                         *    NOT be included in a candidate set.
1184                         */
1185                        if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1186                            (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1187                                continue;
1188
1189                        score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1190
1191                        if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1192                                     score->addr_type & IPV6_ADDR_MULTICAST)) {
1193                                LIMIT_NETDEBUG(KERN_DEBUG
1194                                               "ADDRCONF: unspecified / multicast address "
1195                                               "assigned as unicast address on %s",
1196                                               dev->name);
1197                                continue;
1198                        }
1199
1200                        score->rule = -1;
1201                        bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1202
1203                        for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1204                                int minihiscore, miniscore;
1205
1206                                minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1207                                miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1208
1209                                if (minihiscore > miniscore) {
1210                                        if (i == IPV6_SADDR_RULE_SCOPE &&
1211                                            score->scopedist > 0) {
1212                                                /*
1213                                                 * special case:
1214                                                 * each remaining entry
1215                                                 * has too small (not enough)
1216                                                 * scope, because ifa entries
1217                                                 * are sorted by their scope
1218                                                 * values.
1219                                                 */
1220                                                goto try_nextdev;
1221                                        }
1222                                        break;
1223                                } else if (minihiscore < miniscore) {
1224                                        if (hiscore->ifa)
1225                                                in6_ifa_put(hiscore->ifa);
1226
1227                                        in6_ifa_hold(score->ifa);
1228
1229                                        swap(hiscore, score);
1230
1231                                        /* restore our iterator */
1232                                        score->ifa = hiscore->ifa;
1233
1234                                        break;
1235                                }
1236                        }
1237                }
1238try_nextdev:
1239                read_unlock_bh(&idev->lock);
1240        }
1241        rcu_read_unlock();
1242
1243        if (!hiscore->ifa)
1244                return -EADDRNOTAVAIL;
1245
1246        ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1247        in6_ifa_put(hiscore->ifa);
1248        return 0;
1249}
1250EXPORT_SYMBOL(ipv6_dev_get_saddr);
1251
1252int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1253                    unsigned char banned_flags)
1254{
1255        struct inet6_dev *idev;
1256        int err = -EADDRNOTAVAIL;
1257
1258        rcu_read_lock();
1259        idev = __in6_dev_get(dev);
1260        if (idev) {
1261                struct inet6_ifaddr *ifp;
1262
1263                read_lock_bh(&idev->lock);
1264                list_for_each_entry(ifp, &idev->addr_list, if_list) {
1265                        if (ifp->scope == IFA_LINK &&
1266                            !(ifp->flags & banned_flags)) {
1267                                ipv6_addr_copy(addr, &ifp->addr);
1268                                err = 0;
1269                                break;
1270                        }
1271                }
1272                read_unlock_bh(&idev->lock);
1273        }
1274        rcu_read_unlock();
1275        return err;
1276}
1277
1278static int ipv6_count_addresses(struct inet6_dev *idev)
1279{
1280        int cnt = 0;
1281        struct inet6_ifaddr *ifp;
1282
1283        read_lock_bh(&idev->lock);
1284        list_for_each_entry(ifp, &idev->addr_list, if_list)
1285                cnt++;
1286        read_unlock_bh(&idev->lock);
1287        return cnt;
1288}
1289
1290int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1291                  struct net_device *dev, int strict)
1292{
1293        struct inet6_ifaddr *ifp;
1294        struct hlist_node *node;
1295        unsigned int hash = ipv6_addr_hash(addr);
1296
1297        rcu_read_lock_bh();
1298        hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1299                if (!net_eq(dev_net(ifp->idev->dev), net))
1300                        continue;
1301                if (ipv6_addr_equal(&ifp->addr, addr) &&
1302                    !(ifp->flags&IFA_F_TENTATIVE) &&
1303                    (dev == NULL || ifp->idev->dev == dev ||
1304                     !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1305                        rcu_read_unlock_bh();
1306                        return 1;
1307                }
1308        }
1309
1310        rcu_read_unlock_bh();
1311        return 0;
1312}
1313EXPORT_SYMBOL(ipv6_chk_addr);
1314
1315static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1316                               struct net_device *dev)
1317{
1318        unsigned int hash = ipv6_addr_hash(addr);
1319        struct inet6_ifaddr *ifp;
1320        struct hlist_node *node;
1321
1322        hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1323                if (!net_eq(dev_net(ifp->idev->dev), net))
1324                        continue;
1325                if (ipv6_addr_equal(&ifp->addr, addr)) {
1326                        if (dev == NULL || ifp->idev->dev == dev)
1327                                return true;
1328                }
1329        }
1330        return false;
1331}
1332
1333int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1334{
1335        struct inet6_dev *idev;
1336        struct inet6_ifaddr *ifa;
1337        int     onlink;
1338
1339        onlink = 0;
1340        rcu_read_lock();
1341        idev = __in6_dev_get(dev);
1342        if (idev) {
1343                read_lock_bh(&idev->lock);
1344                list_for_each_entry(ifa, &idev->addr_list, if_list) {
1345                        onlink = ipv6_prefix_equal(addr, &ifa->addr,
1346                                                   ifa->prefix_len);
1347                        if (onlink)
1348                                break;
1349                }
1350                read_unlock_bh(&idev->lock);
1351        }
1352        rcu_read_unlock();
1353        return onlink;
1354}
1355
1356EXPORT_SYMBOL(ipv6_chk_prefix);
1357
1358struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1359                                     struct net_device *dev, int strict)
1360{
1361        struct inet6_ifaddr *ifp, *result = NULL;
1362        unsigned int hash = ipv6_addr_hash(addr);
1363        struct hlist_node *node;
1364
1365        rcu_read_lock_bh();
1366        hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1367                if (!net_eq(dev_net(ifp->idev->dev), net))
1368                        continue;
1369                if (ipv6_addr_equal(&ifp->addr, addr)) {
1370                        if (dev == NULL || ifp->idev->dev == dev ||
1371                            !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1372                                result = ifp;
1373                                in6_ifa_hold(ifp);
1374                                break;
1375                        }
1376                }
1377        }
1378        rcu_read_unlock_bh();
1379
1380        return result;
1381}
1382
1383/* Gets referenced address, destroys ifaddr */
1384
1385static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1386{
1387        if (ifp->flags&IFA_F_PERMANENT) {
1388                spin_lock_bh(&ifp->lock);
1389                addrconf_del_timer(ifp);
1390                ifp->flags |= IFA_F_TENTATIVE;
1391                if (dad_failed)
1392                        ifp->flags |= IFA_F_DADFAILED;
1393                spin_unlock_bh(&ifp->lock);
1394                if (dad_failed)
1395                        ipv6_ifa_notify(0, ifp);
1396                in6_ifa_put(ifp);
1397#ifdef CONFIG_IPV6_PRIVACY
1398        } else if (ifp->flags&IFA_F_TEMPORARY) {
1399                struct inet6_ifaddr *ifpub;
1400                spin_lock_bh(&ifp->lock);
1401                ifpub = ifp->ifpub;
1402                if (ifpub) {
1403                        in6_ifa_hold(ifpub);
1404                        spin_unlock_bh(&ifp->lock);
1405                        ipv6_create_tempaddr(ifpub, ifp);
1406                        in6_ifa_put(ifpub);
1407                } else {
1408                        spin_unlock_bh(&ifp->lock);
1409                }
1410                ipv6_del_addr(ifp);
1411#endif
1412        } else
1413                ipv6_del_addr(ifp);
1414}
1415
1416static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1417{
1418        int err = -ENOENT;
1419
1420        spin_lock(&ifp->state_lock);
1421        if (ifp->state == INET6_IFADDR_STATE_DAD) {
1422                ifp->state = INET6_IFADDR_STATE_POSTDAD;
1423                err = 0;
1424        }
1425        spin_unlock(&ifp->state_lock);
1426
1427        return err;
1428}
1429
1430void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1431{
1432        struct inet6_dev *idev = ifp->idev;
1433
1434        if (addrconf_dad_end(ifp)) {
1435                in6_ifa_put(ifp);
1436                return;
1437        }
1438
1439        if (net_ratelimit())
1440                printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1441                        ifp->idev->dev->name, &ifp->addr);
1442
1443        if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1444                struct in6_addr addr;
1445
1446                addr.s6_addr32[0] = htonl(0xfe800000);
1447                addr.s6_addr32[1] = 0;
1448
1449                if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1450                    ipv6_addr_equal(&ifp->addr, &addr)) {
1451                        /* DAD failed for link-local based on MAC address */
1452                        idev->cnf.disable_ipv6 = 1;
1453
1454                        printk(KERN_INFO "%s: IPv6 being disabled!\n",
1455                                ifp->idev->dev->name);
1456                }
1457        }
1458
1459        addrconf_dad_stop(ifp, 1);
1460}
1461
1462/* Join to solicited addr multicast group. */
1463
1464void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1465{
1466        struct in6_addr maddr;
1467
1468        if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1469                return;
1470
1471        addrconf_addr_solict_mult(addr, &maddr);
1472        ipv6_dev_mc_inc(dev, &maddr);
1473}
1474
1475void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1476{
1477        struct in6_addr maddr;
1478
1479        if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1480                return;
1481
1482        addrconf_addr_solict_mult(addr, &maddr);
1483        __ipv6_dev_mc_dec(idev, &maddr);
1484}
1485
1486static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1487{
1488        struct in6_addr addr;
1489        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1490        if (ipv6_addr_any(&addr))
1491                return;
1492        ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1493}
1494
1495static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1496{
1497        struct in6_addr addr;
1498        ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1499        if (ipv6_addr_any(&addr))
1500                return;
1501        __ipv6_dev_ac_dec(ifp->idev, &addr);
1502}
1503
1504static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1505{
1506        if (dev->addr_len != ETH_ALEN)
1507                return -1;
1508        memcpy(eui, dev->dev_addr, 3);
1509        memcpy(eui + 5, dev->dev_addr + 3, 3);
1510
1511        /*
1512         * The zSeries OSA network cards can be shared among various
1513         * OS instances, but the OSA cards have only one MAC address.
1514         * This leads to duplicate address conflicts in conjunction
1515         * with IPv6 if more than one instance uses the same card.
1516         *
1517         * The driver for these cards can deliver a unique 16-bit
1518         * identifier for each instance sharing the same card.  It is
1519         * placed instead of 0xFFFE in the interface identifier.  The
1520         * "u" bit of the interface identifier is not inverted in this
1521         * case.  Hence the resulting interface identifier has local
1522         * scope according to RFC2373.
1523         */
1524        if (dev->dev_id) {
1525                eui[3] = (dev->dev_id >> 8) & 0xFF;
1526                eui[4] = dev->dev_id & 0xFF;
1527        } else {
1528                eui[3] = 0xFF;
1529                eui[4] = 0xFE;
1530                eui[0] ^= 2;
1531        }
1532        return 0;
1533}
1534
1535static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1536{
1537        /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1538        if (dev->addr_len != ARCNET_ALEN)
1539                return -1;
1540        memset(eui, 0, 7);
1541        eui[7] = *(u8*)dev->dev_addr;
1542        return 0;
1543}
1544
1545static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1546{
1547        if (dev->addr_len != INFINIBAND_ALEN)
1548                return -1;
1549        memcpy(eui, dev->dev_addr + 12, 8);
1550        eui[0] |= 2;
1551        return 0;
1552}
1553
1554static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1555{
1556        if (addr == 0)
1557                return -1;
1558        eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1559                  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1560                  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1561                  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1562                  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1563                  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1564        eui[1] = 0;
1565        eui[2] = 0x5E;
1566        eui[3] = 0xFE;
1567        memcpy(eui + 4, &addr, 4);
1568        return 0;
1569}
1570
1571static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1572{
1573        if (dev->priv_flags & IFF_ISATAP)
1574                return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1575        return -1;
1576}
1577
1578static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1579{
1580        switch (dev->type) {
1581        case ARPHRD_ETHER:
1582        case ARPHRD_FDDI:
1583        case ARPHRD_IEEE802_TR:
1584                return addrconf_ifid_eui48(eui, dev);
1585        case ARPHRD_ARCNET:
1586                return addrconf_ifid_arcnet(eui, dev);
1587        case ARPHRD_INFINIBAND:
1588                return addrconf_ifid_infiniband(eui, dev);
1589        case ARPHRD_SIT:
1590                return addrconf_ifid_sit(eui, dev);
1591        }
1592        return -1;
1593}
1594
1595static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1596{
1597        int err = -1;
1598        struct inet6_ifaddr *ifp;
1599
1600        read_lock_bh(&idev->lock);
1601        list_for_each_entry(ifp, &idev->addr_list, if_list) {
1602                if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1603                        memcpy(eui, ifp->addr.s6_addr+8, 8);
1604                        err = 0;
1605                        break;
1606                }
1607        }
1608        read_unlock_bh(&idev->lock);
1609        return err;
1610}
1611
1612#ifdef CONFIG_IPV6_PRIVACY
1613/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1614static int __ipv6_regen_rndid(struct inet6_dev *idev)
1615{
1616regen:
1617        get_random_bytes(idev->rndid, sizeof(idev->rndid));
1618        idev->rndid[0] &= ~0x02;
1619
1620        /*
1621         * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1622         * check if generated address is not inappropriate
1623         *
1624         *  - Reserved subnet anycast (RFC 2526)
1625         *      11111101 11....11 1xxxxxxx
1626         *  - ISATAP (RFC4214) 6.1
1627         *      00-00-5E-FE-xx-xx-xx-xx
1628         *  - value 0
1629         *  - XXX: already assigned to an address on the device
1630         */
1631        if (idev->rndid[0] == 0xfd &&
1632            (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1633            (idev->rndid[7]&0x80))
1634                goto regen;
1635        if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1636                if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1637                        goto regen;
1638                if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1639                        goto regen;
1640        }
1641
1642        return 0;
1643}
1644
1645static void ipv6_regen_rndid(unsigned long data)
1646{
1647        struct inet6_dev *idev = (struct inet6_dev *) data;
1648        unsigned long expires;
1649
1650        rcu_read_lock_bh();
1651        write_lock_bh(&idev->lock);
1652
1653        if (idev->dead)
1654                goto out;
1655
1656        if (__ipv6_regen_rndid(idev) < 0)
1657                goto out;
1658
1659        expires = jiffies +
1660                idev->cnf.temp_prefered_lft * HZ -
1661                idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1662                idev->cnf.max_desync_factor * HZ;
1663        if (time_before(expires, jiffies)) {
1664                printk(KERN_WARNING
1665                        "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1666                        idev->dev->name);
1667                goto out;
1668        }
1669
1670        if (!mod_timer(&idev->regen_timer, expires))
1671                in6_dev_hold(idev);
1672
1673out:
1674        write_unlock_bh(&idev->lock);
1675        rcu_read_unlock_bh();
1676        in6_dev_put(idev);
1677}
1678
1679static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1680        int ret = 0;
1681
1682        if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1683                ret = __ipv6_regen_rndid(idev);
1684        return ret;
1685}
1686#endif
1687
1688/*
1689 *      Add prefix route.
1690 */
1691
1692static void
1693addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1694                      unsigned long expires, u32 flags)
1695{
1696        struct fib6_config cfg = {
1697                .fc_table = RT6_TABLE_PREFIX,
1698                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1699                .fc_ifindex = dev->ifindex,
1700                .fc_expires = expires,
1701                .fc_dst_len = plen,
1702                .fc_flags = RTF_UP | flags,
1703                .fc_nlinfo.nl_net = dev_net(dev),
1704                .fc_protocol = RTPROT_KERNEL,
1705        };
1706
1707        ipv6_addr_copy(&cfg.fc_dst, pfx);
1708
1709        /* Prevent useless cloning on PtP SIT.
1710           This thing is done here expecting that the whole
1711           class of non-broadcast devices need not cloning.
1712         */
1713#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1714        if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1715                cfg.fc_flags |= RTF_NONEXTHOP;
1716#endif
1717
1718        ip6_route_add(&cfg);
1719}
1720
1721/* Create "default" multicast route to the interface */
1722
1723static void addrconf_add_mroute(struct net_device *dev)
1724{
1725        struct fib6_config cfg = {
1726                .fc_table = RT6_TABLE_LOCAL,
1727                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1728                .fc_ifindex = dev->ifindex,
1729                .fc_dst_len = 8,
1730                .fc_flags = RTF_UP,
1731                .fc_nlinfo.nl_net = dev_net(dev),
1732        };
1733
1734        ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1735
1736        ip6_route_add(&cfg);
1737}
1738
1739#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1740static void sit_route_add(struct net_device *dev)
1741{
1742        struct fib6_config cfg = {
1743                .fc_table = RT6_TABLE_MAIN,
1744                .fc_metric = IP6_RT_PRIO_ADDRCONF,
1745                .fc_ifindex = dev->ifindex,
1746                .fc_dst_len = 96,
1747                .fc_flags = RTF_UP | RTF_NONEXTHOP,
1748                .fc_nlinfo.nl_net = dev_net(dev),
1749        };
1750
1751        /* prefix length - 96 bits "::d.d.d.d" */
1752        ip6_route_add(&cfg);
1753}
1754#endif
1755
1756static void addrconf_add_lroute(struct net_device *dev)
1757{
1758        struct in6_addr addr;
1759
1760        ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1761        addrconf_prefix_route(&addr, 64, dev, 0, 0);
1762}
1763
1764static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1765{
1766        struct inet6_dev *idev;
1767
1768        ASSERT_RTNL();
1769
1770        idev = ipv6_find_idev(dev);
1771        if (!idev)
1772                return ERR_PTR(-ENOBUFS);
1773
1774        if (idev->cnf.disable_ipv6)
1775                return ERR_PTR(-EACCES);
1776
1777        /* Add default multicast route */
1778        addrconf_add_mroute(dev);
1779
1780        /* Add link local route */
1781        addrconf_add_lroute(dev);
1782        return idev;
1783}
1784
1785void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1786{
1787        struct prefix_info *pinfo;
1788        __u32 valid_lft;
1789        __u32 prefered_lft;
1790        int addr_type;
1791        struct inet6_dev *in6_dev;
1792        struct net *net = dev_net(dev);
1793
1794        pinfo = (struct prefix_info *) opt;
1795
1796        if (len < sizeof(struct prefix_info)) {
1797                ADBG(("addrconf: prefix option too short\n"));
1798                return;
1799        }
1800
1801        /*
1802         *      Validation checks ([ADDRCONF], page 19)
1803         */
1804
1805        addr_type = ipv6_addr_type(&pinfo->prefix);
1806
1807        if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1808                return;
1809
1810        valid_lft = ntohl(pinfo->valid);
1811        prefered_lft = ntohl(pinfo->prefered);
1812
1813        if (prefered_lft > valid_lft) {
1814                if (net_ratelimit())
1815                        printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1816                return;
1817        }
1818
1819        in6_dev = in6_dev_get(dev);
1820
1821        if (in6_dev == NULL) {
1822                if (net_ratelimit())
1823                        printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1824                return;
1825        }
1826
1827        /*
1828         *      Two things going on here:
1829         *      1) Add routes for on-link prefixes
1830         *      2) Configure prefixes with the auto flag set
1831         */
1832
1833        if (pinfo->onlink) {
1834                struct rt6_info *rt;
1835                unsigned long rt_expires;
1836
1837                /* Avoid arithmetic overflow. Really, we could
1838                 * save rt_expires in seconds, likely valid_lft,
1839                 * but it would require division in fib gc, that it
1840                 * not good.
1841                 */
1842                if (HZ > USER_HZ)
1843                        rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1844                else
1845                        rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1846
1847                if (addrconf_finite_timeout(rt_expires))
1848                        rt_expires *= HZ;
1849
1850                rt = rt6_lookup(net, &pinfo->prefix, NULL,
1851                                dev->ifindex, 1);
1852
1853                if (rt && addrconf_is_prefix_route(rt)) {
1854                        /* Autoconf prefix route */
1855                        if (valid_lft == 0) {
1856                                ip6_del_rt(rt);
1857                                rt = NULL;
1858                        } else if (addrconf_finite_timeout(rt_expires)) {
1859                                /* not infinity */
1860                                rt->rt6i_expires = jiffies + rt_expires;
1861                                rt->rt6i_flags |= RTF_EXPIRES;
1862                        } else {
1863                                rt->rt6i_flags &= ~RTF_EXPIRES;
1864                                rt->rt6i_expires = 0;
1865                        }
1866                } else if (valid_lft) {
1867                        clock_t expires = 0;
1868                        int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1869                        if (addrconf_finite_timeout(rt_expires)) {
1870                                /* not infinity */
1871                                flags |= RTF_EXPIRES;
1872                                expires = jiffies_to_clock_t(rt_expires);
1873                        }
1874                        addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1875                                              dev, expires, flags);
1876                }
1877                if (rt)
1878                        dst_release(&rt->dst);
1879        }
1880
1881        /* Try to figure out our local address for this prefix */
1882
1883        if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1884                struct inet6_ifaddr * ifp;
1885                struct in6_addr addr;
1886                int create = 0, update_lft = 0;
1887
1888                if (pinfo->prefix_len == 64) {
1889                        memcpy(&addr, &pinfo->prefix, 8);
1890                        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1891                            ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1892                                in6_dev_put(in6_dev);
1893                                return;
1894                        }
1895                        goto ok;
1896                }
1897                if (net_ratelimit())
1898                        printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1899                               pinfo->prefix_len);
1900                in6_dev_put(in6_dev);
1901                return;
1902
1903ok:
1904
1905                ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1906
1907                if (ifp == NULL && valid_lft) {
1908                        int max_addresses = in6_dev->cnf.max_addresses;
1909                        u32 addr_flags = 0;
1910
1911#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1912                        if (in6_dev->cnf.optimistic_dad &&
1913                            !net->ipv6.devconf_all->forwarding)
1914                                addr_flags = IFA_F_OPTIMISTIC;
1915#endif
1916
1917                        /* Do not allow to create too much of autoconfigured
1918                         * addresses; this would be too easy way to crash kernel.
1919                         */
1920                        if (!max_addresses ||
1921                            ipv6_count_addresses(in6_dev) < max_addresses)
1922                                ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1923                                                    addr_type&IPV6_ADDR_SCOPE_MASK,
1924                                                    addr_flags);
1925
1926                        if (!ifp || IS_ERR(ifp)) {
1927                                in6_dev_put(in6_dev);
1928                                return;
1929                        }
1930
1931                        update_lft = create = 1;
1932                        ifp->cstamp = jiffies;
1933                        addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1934                }
1935
1936                if (ifp) {
1937                        int flags;
1938                        unsigned long now;
1939#ifdef CONFIG_IPV6_PRIVACY
1940                        struct inet6_ifaddr *ift;
1941#endif
1942                        u32 stored_lft;
1943
1944                        /* update lifetime (RFC2462 5.5.3 e) */
1945                        spin_lock(&ifp->lock);
1946                        now = jiffies;
1947                        if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1948                                stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1949                        else
1950                                stored_lft = 0;
1951                        if (!update_lft && stored_lft) {
1952                                if (valid_lft > MIN_VALID_LIFETIME ||
1953                                    valid_lft > stored_lft)
1954                                        update_lft = 1;
1955                                else if (stored_lft <= MIN_VALID_LIFETIME) {
1956                                        /* valid_lft <= stored_lft is always true */
1957                                        /*
1958                                         * RFC 4862 Section 5.5.3e:
1959                                         * "Note that the preferred lifetime of
1960                                         *  the corresponding address is always
1961                                         *  reset to the Preferred Lifetime in
1962                                         *  the received Prefix Information
1963                                         *  option, regardless of whether the
1964                                         *  valid lifetime is also reset or
1965                                         *  ignored."
1966                                         *
1967                                         *  So if the preferred lifetime in
1968                                         *  this advertisement is different
1969                                         *  than what we have stored, but the
1970                                         *  valid lifetime is invalid, just
1971                                         *  reset prefered_lft.
1972                                         *
1973                                         *  We must set the valid lifetime
1974                                         *  to the stored lifetime since we'll
1975                                         *  be updating the timestamp below,
1976                                         *  else we'll set it back to the
1977                                         *  minumum.
1978                                         */
1979                                        if (prefered_lft != ifp->prefered_lft) {
1980                                                valid_lft = stored_lft;
1981                                                update_lft = 1;
1982                                        }
1983                                } else {
1984                                        valid_lft = MIN_VALID_LIFETIME;
1985                                        if (valid_lft < prefered_lft)
1986                                                prefered_lft = valid_lft;
1987                                        update_lft = 1;
1988                                }
1989                        }
1990
1991                        if (update_lft) {
1992                                ifp->valid_lft = valid_lft;
1993                                ifp->prefered_lft = prefered_lft;
1994                                ifp->tstamp = now;
1995                                flags = ifp->flags;
1996                                ifp->flags &= ~IFA_F_DEPRECATED;
1997                                spin_unlock(&ifp->lock);
1998
1999                                if (!(flags&IFA_F_TENTATIVE))
2000                                        ipv6_ifa_notify(0, ifp);
2001                        } else
2002                                spin_unlock(&ifp->lock);
2003
2004#ifdef CONFIG_IPV6_PRIVACY
2005                        read_lock_bh(&in6_dev->lock);
2006                        /* update all temporary addresses in the list */
2007                        list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2008                                /*
2009                                 * When adjusting the lifetimes of an existing
2010                                 * temporary address, only lower the lifetimes.
2011                                 * Implementations must not increase the
2012                                 * lifetimes of an existing temporary address
2013                                 * when processing a Prefix Information Option.
2014                                 */
2015                                if (ifp != ift->ifpub)
2016                                        continue;
2017
2018                                spin_lock(&ift->lock);
2019                                flags = ift->flags;
2020                                if (ift->valid_lft > valid_lft &&
2021                                    ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2022                                        ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2023                                if (ift->prefered_lft > prefered_lft &&
2024                                    ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2025                                        ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2026                                spin_unlock(&ift->lock);
2027                                if (!(flags&IFA_F_TENTATIVE))
2028                                        ipv6_ifa_notify(0, ift);
2029                        }
2030
2031                        if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2032                                /*
2033                                 * When a new public address is created as described in [ADDRCONF],
2034                                 * also create a new temporary address. Also create a temporary
2035                                 * address if it's enabled but no temporary address currently exists.
2036                                 */
2037                                read_unlock_bh(&in6_dev->lock);
2038                                ipv6_create_tempaddr(ifp, NULL);
2039                        } else {
2040                                read_unlock_bh(&in6_dev->lock);
2041                        }
2042#endif
2043                        in6_ifa_put(ifp);
2044                        addrconf_verify(0);
2045                }
2046        }
2047        inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2048        in6_dev_put(in6_dev);
2049}
2050
2051/*
2052 *      Set destination address.
2053 *      Special case for SIT interfaces where we create a new "virtual"
2054 *      device.
2055 */
2056int addrconf_set_dstaddr(struct net *net, void __user *arg)
2057{
2058        struct in6_ifreq ireq;
2059        struct net_device *dev;
2060        int err = -EINVAL;
2061
2062        rtnl_lock();
2063
2064        err = -EFAULT;
2065        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2066                goto err_exit;
2067
2068        dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2069
2070        err = -ENODEV;
2071        if (dev == NULL)
2072                goto err_exit;
2073
2074#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2075        if (dev->type == ARPHRD_SIT) {
2076                const struct net_device_ops *ops = dev->netdev_ops;
2077                struct ifreq ifr;
2078                struct ip_tunnel_parm p;
2079
2080                err = -EADDRNOTAVAIL;
2081                if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2082                        goto err_exit;
2083
2084                memset(&p, 0, sizeof(p));
2085                p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2086                p.iph.saddr = 0;
2087                p.iph.version = 4;
2088                p.iph.ihl = 5;
2089                p.iph.protocol = IPPROTO_IPV6;
2090                p.iph.ttl = 64;
2091                ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2092
2093                if (ops->ndo_do_ioctl) {
2094                        mm_segment_t oldfs = get_fs();
2095
2096                        set_fs(KERNEL_DS);
2097                        err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2098                        set_fs(oldfs);
2099                } else
2100                        err = -EOPNOTSUPP;
2101
2102                if (err == 0) {
2103                        err = -ENOBUFS;
2104                        dev = __dev_get_by_name(net, p.name);
2105                        if (!dev)
2106                                goto err_exit;
2107                        err = dev_open(dev);
2108                }
2109        }
2110#endif
2111
2112err_exit:
2113        rtnl_unlock();
2114        return err;
2115}
2116
2117/*
2118 *      Manual configuration of address on an interface
2119 */
2120static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2121                          unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2122                          __u32 valid_lft)
2123{
2124        struct inet6_ifaddr *ifp;
2125        struct inet6_dev *idev;
2126        struct net_device *dev;
2127        int scope;
2128        u32 flags;
2129        clock_t expires;
2130        unsigned long timeout;
2131
2132        ASSERT_RTNL();
2133
2134        if (plen > 128)
2135                return -EINVAL;
2136
2137        /* check the lifetime */
2138        if (!valid_lft || prefered_lft > valid_lft)
2139                return -EINVAL;
2140
2141        dev = __dev_get_by_index(net, ifindex);
2142        if (!dev)
2143                return -ENODEV;
2144
2145        idev = addrconf_add_dev(dev);
2146        if (IS_ERR(idev))
2147                return PTR_ERR(idev);
2148
2149        scope = ipv6_addr_scope(pfx);
2150
2151        timeout = addrconf_timeout_fixup(valid_lft, HZ);
2152        if (addrconf_finite_timeout(timeout)) {
2153                expires = jiffies_to_clock_t(timeout * HZ);
2154                valid_lft = timeout;
2155                flags = RTF_EXPIRES;
2156        } else {
2157                expires = 0;
2158                flags = 0;
2159                ifa_flags |= IFA_F_PERMANENT;
2160        }
2161
2162        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2163        if (addrconf_finite_timeout(timeout)) {
2164                if (timeout == 0)
2165                        ifa_flags |= IFA_F_DEPRECATED;
2166                prefered_lft = timeout;
2167        }
2168
2169        ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2170
2171        if (!IS_ERR(ifp)) {
2172                spin_lock_bh(&ifp->lock);
2173                ifp->valid_lft = valid_lft;
2174                ifp->prefered_lft = prefered_lft;
2175                ifp->tstamp = jiffies;
2176                spin_unlock_bh(&ifp->lock);
2177
2178                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2179                                      expires, flags);
2180                /*
2181                 * Note that section 3.1 of RFC 4429 indicates
2182                 * that the Optimistic flag should not be set for
2183                 * manually configured addresses
2184                 */
2185                addrconf_dad_start(ifp, 0);
2186                in6_ifa_put(ifp);
2187                addrconf_verify(0);
2188                return 0;
2189        }
2190
2191        return PTR_ERR(ifp);
2192}
2193
2194static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2195                          unsigned int plen)
2196{
2197        struct inet6_ifaddr *ifp;
2198        struct inet6_dev *idev;
2199        struct net_device *dev;
2200
2201        if (plen > 128)
2202                return -EINVAL;
2203
2204        dev = __dev_get_by_index(net, ifindex);
2205        if (!dev)
2206                return -ENODEV;
2207
2208        if ((idev = __in6_dev_get(dev)) == NULL)
2209                return -ENXIO;
2210
2211        read_lock_bh(&idev->lock);
2212        list_for_each_entry(ifp, &idev->addr_list, if_list) {
2213                if (ifp->prefix_len == plen &&
2214                    ipv6_addr_equal(pfx, &ifp->addr)) {
2215                        in6_ifa_hold(ifp);
2216                        read_unlock_bh(&idev->lock);
2217
2218                        ipv6_del_addr(ifp);
2219
2220                        /* If the last address is deleted administratively,
2221                           disable IPv6 on this interface.
2222                         */
2223                        if (list_empty(&idev->addr_list))
2224                                addrconf_ifdown(idev->dev, 1);
2225                        return 0;
2226                }
2227        }
2228        read_unlock_bh(&idev->lock);
2229        return -EADDRNOTAVAIL;
2230}
2231
2232
2233int addrconf_add_ifaddr(struct net *net, void __user *arg)
2234{
2235        struct in6_ifreq ireq;
2236        int err;
2237
2238        if (!capable(CAP_NET_ADMIN))
2239                return -EPERM;
2240
2241        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2242                return -EFAULT;
2243
2244        rtnl_lock();
2245        err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2246                             ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2247                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2248        rtnl_unlock();
2249        return err;
2250}
2251
2252int addrconf_del_ifaddr(struct net *net, void __user *arg)
2253{
2254        struct in6_ifreq ireq;
2255        int err;
2256
2257        if (!capable(CAP_NET_ADMIN))
2258                return -EPERM;
2259
2260        if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2261                return -EFAULT;
2262
2263        rtnl_lock();
2264        err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2265                             ireq.ifr6_prefixlen);
2266        rtnl_unlock();
2267        return err;
2268}
2269
2270static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2271                     int plen, int scope)
2272{
2273        struct inet6_ifaddr *ifp;
2274
2275        ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2276        if (!IS_ERR(ifp)) {
2277                spin_lock_bh(&ifp->lock);
2278                ifp->flags &= ~IFA_F_TENTATIVE;
2279                spin_unlock_bh(&ifp->lock);
2280                ipv6_ifa_notify(RTM_NEWADDR, ifp);
2281                in6_ifa_put(ifp);
2282        }
2283}
2284
2285#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2286static void sit_add_v4_addrs(struct inet6_dev *idev)
2287{
2288        struct in6_addr addr;
2289        struct net_device *dev;
2290        struct net *net = dev_net(idev->dev);
2291        int scope;
2292
2293        ASSERT_RTNL();
2294
2295        memset(&addr, 0, sizeof(struct in6_addr));
2296        memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2297
2298        if (idev->dev->flags&IFF_POINTOPOINT) {
2299                addr.s6_addr32[0] = htonl(0xfe800000);
2300                scope = IFA_LINK;
2301        } else {
2302                scope = IPV6_ADDR_COMPATv4;
2303        }
2304
2305        if (addr.s6_addr32[3]) {
2306                add_addr(idev, &addr, 128, scope);
2307                return;
2308        }
2309
2310        for_each_netdev(net, dev) {
2311                struct in_device * in_dev = __in_dev_get_rtnl(dev);
2312                if (in_dev && (dev->flags & IFF_UP)) {
2313                        struct in_ifaddr * ifa;
2314
2315                        int flag = scope;
2316
2317                        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2318                                int plen;
2319
2320                                addr.s6_addr32[3] = ifa->ifa_local;
2321
2322                                if (ifa->ifa_scope == RT_SCOPE_LINK)
2323                                        continue;
2324                                if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2325                                        if (idev->dev->flags&IFF_POINTOPOINT)
2326                                                continue;
2327                                        flag |= IFA_HOST;
2328                                }
2329                                if (idev->dev->flags&IFF_POINTOPOINT)
2330                                        plen = 64;
2331                                else
2332                                        plen = 96;
2333
2334                                add_addr(idev, &addr, plen, flag);
2335                        }
2336                }
2337        }
2338}
2339#endif
2340
2341static void init_loopback(struct net_device *dev)
2342{
2343        struct inet6_dev  *idev;
2344
2345        /* ::1 */
2346
2347        ASSERT_RTNL();
2348
2349        if ((idev = ipv6_find_idev(dev)) == NULL) {
2350                printk(KERN_DEBUG "init loopback: add_dev failed\n");
2351                return;
2352        }
2353
2354        add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2355}
2356
2357static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2358{
2359        struct inet6_ifaddr * ifp;
2360        u32 addr_flags = IFA_F_PERMANENT;
2361
2362#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2363        if (idev->cnf.optimistic_dad &&
2364            !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2365                addr_flags |= IFA_F_OPTIMISTIC;
2366#endif
2367
2368
2369        ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2370        if (!IS_ERR(ifp)) {
2371                addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2372                addrconf_dad_start(ifp, 0);
2373                in6_ifa_put(ifp);
2374        }
2375}
2376
2377static void addrconf_dev_config(struct net_device *dev)
2378{
2379        struct in6_addr addr;
2380        struct inet6_dev    * idev;
2381
2382        ASSERT_RTNL();
2383
2384        if ((dev->type != ARPHRD_ETHER) &&
2385            (dev->type != ARPHRD_FDDI) &&
2386            (dev->type != ARPHRD_IEEE802_TR) &&
2387            (dev->type != ARPHRD_ARCNET) &&
2388            (dev->type != ARPHRD_INFINIBAND)) {
2389                /* Alas, we support only Ethernet autoconfiguration. */
2390                return;
2391        }
2392
2393        idev = addrconf_add_dev(dev);
2394        if (IS_ERR(idev))
2395                return;
2396
2397        memset(&addr, 0, sizeof(struct in6_addr));
2398        addr.s6_addr32[0] = htonl(0xFE800000);
2399
2400        if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2401                addrconf_add_linklocal(idev, &addr);
2402}
2403
2404#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2405static void addrconf_sit_config(struct net_device *dev)
2406{
2407        struct inet6_dev *idev;
2408
2409        ASSERT_RTNL();
2410
2411        /*
2412         * Configure the tunnel with one of our IPv4
2413         * addresses... we should configure all of
2414         * our v4 addrs in the tunnel
2415         */
2416
2417        if ((idev = ipv6_find_idev(dev)) == NULL) {
2418                printk(KERN_DEBUG "init sit: add_dev failed\n");
2419                return;
2420        }
2421
2422        if (dev->priv_flags & IFF_ISATAP) {
2423                struct in6_addr addr;
2424
2425                ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2426                addrconf_prefix_route(&addr, 64, dev, 0, 0);
2427                if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2428                        addrconf_add_linklocal(idev, &addr);
2429                return;
2430        }
2431
2432        sit_add_v4_addrs(idev);
2433
2434        if (dev->flags&IFF_POINTOPOINT) {
2435                addrconf_add_mroute(dev);
2436                addrconf_add_lroute(dev);
2437        } else
2438                sit_route_add(dev);
2439}
2440#endif
2441
2442static inline int
2443ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2444{
2445        struct in6_addr lladdr;
2446
2447        if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2448                addrconf_add_linklocal(idev, &lladdr);
2449                return 0;
2450        }
2451        return -1;
2452}
2453
2454static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2455{
2456        struct net_device *link_dev;
2457        struct net *net = dev_net(idev->dev);
2458
2459        /* first try to inherit the link-local address from the link device */
2460        if (idev->dev->iflink &&
2461            (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2462                if (!ipv6_inherit_linklocal(idev, link_dev))
2463                        return;
2464        }
2465        /* then try to inherit it from any device */
2466        for_each_netdev(net, link_dev) {
2467                if (!ipv6_inherit_linklocal(idev, link_dev))
2468                        return;
2469        }
2470        printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2471}
2472
2473/*
2474 * Autoconfigure tunnel with a link-local address so routing protocols,
2475 * DHCPv6, MLD etc. can be run over the virtual link
2476 */
2477
2478static void addrconf_ip6_tnl_config(struct net_device *dev)
2479{
2480        struct inet6_dev *idev;
2481
2482        ASSERT_RTNL();
2483
2484        idev = addrconf_add_dev(dev);
2485        if (IS_ERR(idev)) {
2486                printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2487                return;
2488        }
2489        ip6_tnl_add_linklocal(idev);
2490}
2491
2492static int addrconf_notify(struct notifier_block *this, unsigned long event,
2493                           void * data)
2494{
2495        struct net_device *dev = (struct net_device *) data;
2496        struct inet6_dev *idev = __in6_dev_get(dev);
2497        int run_pending = 0;
2498        int err;
2499
2500        switch (event) {
2501        case NETDEV_REGISTER:
2502                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2503                        idev = ipv6_add_dev(dev);
2504                        if (!idev)
2505                                return notifier_from_errno(-ENOMEM);
2506                }
2507                break;
2508
2509        case NETDEV_UP:
2510        case NETDEV_CHANGE:
2511                if (dev->flags & IFF_SLAVE)
2512                        break;
2513
2514                if (event == NETDEV_UP) {
2515                        if (!addrconf_qdisc_ok(dev)) {
2516                                /* device is not ready yet. */
2517                                printk(KERN_INFO
2518                                        "ADDRCONF(NETDEV_UP): %s: "
2519                                        "link is not ready\n",
2520                                        dev->name);
2521                                break;
2522                        }
2523
2524                        if (!idev && dev->mtu >= IPV6_MIN_MTU)
2525                                idev = ipv6_add_dev(dev);
2526
2527                        if (idev) {
2528                                idev->if_flags |= IF_READY;
2529                                run_pending = 1;
2530                        }
2531                } else {
2532                        if (!addrconf_qdisc_ok(dev)) {
2533                                /* device is still not ready. */
2534                                break;
2535                        }
2536
2537                        if (idev) {
2538                                if (idev->if_flags & IF_READY)
2539                                        /* device is already configured. */
2540                                        break;
2541                                idev->if_flags |= IF_READY;
2542                        }
2543
2544                        printk(KERN_INFO
2545                                        "ADDRCONF(NETDEV_CHANGE): %s: "
2546                                        "link becomes ready\n",
2547                                        dev->name);
2548
2549                        run_pending = 1;
2550                }
2551
2552                switch (dev->type) {
2553#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2554                case ARPHRD_SIT:
2555                        addrconf_sit_config(dev);
2556                        break;
2557#endif
2558                case ARPHRD_TUNNEL6:
2559                        addrconf_ip6_tnl_config(dev);
2560                        break;
2561                case ARPHRD_LOOPBACK:
2562                        init_loopback(dev);
2563                        break;
2564
2565                default:
2566                        addrconf_dev_config(dev);
2567                        break;
2568                }
2569
2570                if (idev) {
2571                        if (run_pending)
2572                                addrconf_dad_run(idev);
2573
2574                        /*
2575                         * If the MTU changed during the interface down,
2576                         * when the interface up, the changed MTU must be
2577                         * reflected in the idev as well as routers.
2578                         */
2579                        if (idev->cnf.mtu6 != dev->mtu &&
2580                            dev->mtu >= IPV6_MIN_MTU) {
2581                                rt6_mtu_change(dev, dev->mtu);
2582                                idev->cnf.mtu6 = dev->mtu;
2583                        }
2584                        idev->tstamp = jiffies;
2585                        inet6_ifinfo_notify(RTM_NEWLINK, idev);
2586
2587                        /*
2588                         * If the changed mtu during down is lower than
2589                         * IPV6_MIN_MTU stop IPv6 on this interface.
2590                         */
2591                        if (dev->mtu < IPV6_MIN_MTU)
2592                                addrconf_ifdown(dev, 1);
2593                }
2594                break;
2595
2596        case NETDEV_CHANGEMTU:
2597                if (idev && dev->mtu >= IPV6_MIN_MTU) {
2598                        rt6_mtu_change(dev, dev->mtu);
2599                        idev->cnf.mtu6 = dev->mtu;
2600                        break;
2601                }
2602
2603                if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2604                        idev = ipv6_add_dev(dev);
2605                        if (idev)
2606                                break;
2607                }
2608
2609                /*
2610                 * MTU falled under IPV6_MIN_MTU.
2611                 * Stop IPv6 on this interface.
2612                 */
2613
2614        case NETDEV_DOWN:
2615        case NETDEV_UNREGISTER:
2616                /*
2617                 *      Remove all addresses from this interface.
2618                 */
2619                addrconf_ifdown(dev, event != NETDEV_DOWN);
2620                break;
2621
2622        case NETDEV_CHANGENAME:
2623                if (idev) {
2624                        snmp6_unregister_dev(idev);
2625                        addrconf_sysctl_unregister(idev);
2626                        addrconf_sysctl_register(idev);
2627                        err = snmp6_register_dev(idev);
2628                        if (err)
2629                                return notifier_from_errno(err);
2630                }
2631                break;
2632
2633        case NETDEV_PRE_TYPE_CHANGE:
2634        case NETDEV_POST_TYPE_CHANGE:
2635                addrconf_type_change(dev, event);
2636                break;
2637        }
2638
2639        return NOTIFY_OK;
2640}
2641
2642/*
2643 *      addrconf module should be notified of a device going up
2644 */
2645static struct notifier_block ipv6_dev_notf = {
2646        .notifier_call = addrconf_notify,
2647};
2648
2649static void addrconf_type_change(struct net_device *dev, unsigned long event)
2650{
2651        struct inet6_dev *idev;
2652        ASSERT_RTNL();
2653
2654        idev = __in6_dev_get(dev);
2655
2656        if (event == NETDEV_POST_TYPE_CHANGE)
2657                ipv6_mc_remap(idev);
2658        else if (event == NETDEV_PRE_TYPE_CHANGE)
2659                ipv6_mc_unmap(idev);
2660}
2661
2662static int addrconf_ifdown(struct net_device *dev, int how)
2663{
2664        struct net *net = dev_net(dev);
2665        struct inet6_dev *idev;
2666        struct inet6_ifaddr *ifa;
2667        LIST_HEAD(keep_list);
2668        int state;
2669
2670        ASSERT_RTNL();
2671
2672        /* Flush routes if device is being removed or it is not loopback */
2673        if (how || !(dev->flags & IFF_LOOPBACK))
2674                rt6_ifdown(net, dev);
2675        neigh_ifdown(&nd_tbl, dev);
2676
2677        idev = __in6_dev_get(dev);
2678        if (idev == NULL)
2679                return -ENODEV;
2680
2681        /*
2682         * Step 1: remove reference to ipv6 device from parent device.
2683         *         Do not dev_put!
2684         */
2685        if (how) {
2686                idev->dead = 1;
2687
2688                /* protected by rtnl_lock */
2689                rcu_assign_pointer(dev->ip6_ptr, NULL);
2690
2691                /* Step 1.5: remove snmp6 entry */
2692                snmp6_unregister_dev(idev);
2693
2694        }
2695
2696        write_lock_bh(&idev->lock);
2697
2698        /* Step 2: clear flags for stateless addrconf */
2699        if (!how)
2700                idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2701
2702#ifdef CONFIG_IPV6_PRIVACY
2703        if (how && del_timer(&idev->regen_timer))
2704                in6_dev_put(idev);
2705
2706        /* Step 3: clear tempaddr list */
2707        while (!list_empty(&idev->tempaddr_list)) {
2708                ifa = list_first_entry(&idev->tempaddr_list,
2709                                       struct inet6_ifaddr, tmp_list);
2710                list_del(&ifa->tmp_list);
2711                write_unlock_bh(&idev->lock);
2712                spin_lock_bh(&ifa->lock);
2713
2714                if (ifa->ifpub) {
2715                        in6_ifa_put(ifa->ifpub);
2716                        ifa->ifpub = NULL;
2717                }
2718                spin_unlock_bh(&ifa->lock);
2719                in6_ifa_put(ifa);
2720                write_lock_bh(&idev->lock);
2721        }
2722#endif
2723
2724        while (!list_empty(&idev->addr_list)) {
2725                ifa = list_first_entry(&idev->addr_list,
2726                                       struct inet6_ifaddr, if_list);
2727                addrconf_del_timer(ifa);
2728
2729                /* If just doing link down, and address is permanent
2730                   and not link-local, then retain it. */
2731                if (!how &&
2732                    (ifa->flags&IFA_F_PERMANENT) &&
2733                    !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2734                        list_move_tail(&ifa->if_list, &keep_list);
2735
2736                        /* If not doing DAD on this address, just keep it. */
2737                        if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2738                            idev->cnf.accept_dad <= 0 ||
2739                            (ifa->flags & IFA_F_NODAD))
2740                                continue;
2741
2742                        /* If it was tentative already, no need to notify */
2743                        if (ifa->flags & IFA_F_TENTATIVE)
2744                                continue;
2745
2746                        /* Flag it for later restoration when link comes up */
2747                        ifa->flags |= IFA_F_TENTATIVE;
2748                        ifa->state = INET6_IFADDR_STATE_DAD;
2749                } else {
2750                        list_del(&ifa->if_list);
2751
2752                        /* clear hash table */
2753                        spin_lock_bh(&addrconf_hash_lock);
2754                        hlist_del_init_rcu(&ifa->addr_lst);
2755                        spin_unlock_bh(&addrconf_hash_lock);
2756
2757                        write_unlock_bh(&idev->lock);
2758                        spin_lock_bh(&ifa->state_lock);
2759                        state = ifa->state;
2760                        ifa->state = INET6_IFADDR_STATE_DEAD;
2761                        spin_unlock_bh(&ifa->state_lock);
2762
2763                        if (state != INET6_IFADDR_STATE_DEAD) {
2764                                __ipv6_ifa_notify(RTM_DELADDR, ifa);
2765                                atomic_notifier_call_chain(&inet6addr_chain,
2766                                                           NETDEV_DOWN, ifa);
2767                        }
2768
2769                        in6_ifa_put(ifa);
2770                        write_lock_bh(&idev->lock);
2771                }
2772        }
2773
2774        list_splice(&keep_list, &idev->addr_list);
2775
2776        write_unlock_bh(&idev->lock);
2777
2778        /* Step 5: Discard multicast list */
2779        if (how)
2780                ipv6_mc_destroy_dev(idev);
2781        else
2782                ipv6_mc_down(idev);
2783
2784        idev->tstamp = jiffies;
2785
2786        /* Last: Shot the device (if unregistered) */
2787        if (how) {
2788                addrconf_sysctl_unregister(idev);
2789                neigh_parms_release(&nd_tbl, idev->nd_parms);
2790                neigh_ifdown(&nd_tbl, dev);
2791                in6_dev_put(idev);
2792        }
2793        return 0;
2794}
2795
2796static void addrconf_rs_timer(unsigned long data)
2797{
2798        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2799        struct inet6_dev *idev = ifp->idev;
2800
2801        read_lock(&idev->lock);
2802        if (idev->dead || !(idev->if_flags & IF_READY))
2803                goto out;
2804
2805        if (idev->cnf.forwarding)
2806                goto out;
2807
2808        /* Announcement received after solicitation was sent */
2809        if (idev->if_flags & IF_RA_RCVD)
2810                goto out;
2811
2812        spin_lock(&ifp->lock);
2813        if (ifp->probes++ < idev->cnf.rtr_solicits) {
2814                /* The wait after the last probe can be shorter */
2815                addrconf_mod_timer(ifp, AC_RS,
2816                                   (ifp->probes == idev->cnf.rtr_solicits) ?
2817                                   idev->cnf.rtr_solicit_delay :
2818                                   idev->cnf.rtr_solicit_interval);
2819                spin_unlock(&ifp->lock);
2820
2821                ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2822        } else {
2823                spin_unlock(&ifp->lock);
2824                /*
2825                 * Note: we do not support deprecated "all on-link"
2826                 * assumption any longer.
2827                 */
2828                printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2829                       idev->dev->name);
2830        }
2831
2832out:
2833        read_unlock(&idev->lock);
2834        in6_ifa_put(ifp);
2835}
2836
2837/*
2838 *      Duplicate Address Detection
2839 */
2840static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2841{
2842        unsigned long rand_num;
2843        struct inet6_dev *idev = ifp->idev;
2844
2845        if (ifp->flags & IFA_F_OPTIMISTIC)
2846                rand_num = 0;
2847        else
2848                rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2849
2850        ifp->probes = idev->cnf.dad_transmits;
2851        addrconf_mod_timer(ifp, AC_DAD, rand_num);
2852}
2853
2854static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2855{
2856        struct inet6_dev *idev = ifp->idev;
2857        struct net_device *dev = idev->dev;
2858
2859        addrconf_join_solict(dev, &ifp->addr);
2860
2861        net_srandom(ifp->addr.s6_addr32[3]);
2862
2863        read_lock_bh(&idev->lock);
2864        spin_lock(&ifp->lock);
2865        if (ifp->state == INET6_IFADDR_STATE_DEAD)
2866                goto out;
2867
2868        if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2869            idev->cnf.accept_dad < 1 ||
2870            !(ifp->flags&IFA_F_TENTATIVE) ||
2871            ifp->flags & IFA_F_NODAD) {
2872                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2873                spin_unlock(&ifp->lock);
2874                read_unlock_bh(&idev->lock);
2875
2876                addrconf_dad_completed(ifp);
2877                return;
2878        }
2879
2880        if (!(idev->if_flags & IF_READY)) {
2881                spin_unlock(&ifp->lock);
2882                read_unlock_bh(&idev->lock);
2883                /*
2884                 * If the device is not ready:
2885                 * - keep it tentative if it is a permanent address.
2886                 * - otherwise, kill it.
2887                 */
2888                in6_ifa_hold(ifp);
2889                addrconf_dad_stop(ifp, 0);
2890                return;
2891        }
2892
2893        /*
2894         * Optimistic nodes can start receiving
2895         * Frames right away
2896         */
2897        if (ifp->flags & IFA_F_OPTIMISTIC)
2898                ip6_ins_rt(ifp->rt);
2899
2900        addrconf_dad_kick(ifp);
2901out:
2902        spin_unlock(&ifp->lock);
2903        read_unlock_bh(&idev->lock);
2904}
2905
2906static void addrconf_dad_timer(unsigned long data)
2907{
2908        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2909        struct inet6_dev *idev = ifp->idev;
2910        struct in6_addr mcaddr;
2911
2912        if (!ifp->probes && addrconf_dad_end(ifp))
2913                goto out;
2914
2915        read_lock(&idev->lock);
2916        if (idev->dead || !(idev->if_flags & IF_READY)) {
2917                read_unlock(&idev->lock);
2918                goto out;
2919        }
2920
2921        spin_lock(&ifp->lock);
2922        if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2923                spin_unlock(&ifp->lock);
2924                read_unlock(&idev->lock);
2925                goto out;
2926        }
2927
2928        if (ifp->probes == 0) {
2929                /*
2930                 * DAD was successful
2931                 */
2932
2933                ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2934                spin_unlock(&ifp->lock);
2935                read_unlock(&idev->lock);
2936
2937                addrconf_dad_completed(ifp);
2938
2939                goto out;
2940        }
2941
2942        ifp->probes--;
2943        addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2944        spin_unlock(&ifp->lock);
2945        read_unlock(&idev->lock);
2946
2947        /* send a neighbour solicitation for our addr */
2948        addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2949        ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2950out:
2951        in6_ifa_put(ifp);
2952}
2953
2954static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2955{
2956        struct net_device *dev = ifp->idev->dev;
2957
2958        /*
2959         *      Configure the address for reception. Now it is valid.
2960         */
2961
2962        ipv6_ifa_notify(RTM_NEWADDR, ifp);
2963
2964        /* If added prefix is link local and forwarding is off,
2965           start sending router solicitations.
2966         */
2967
2968        if ((ifp->idev->cnf.forwarding == 0 ||
2969             ifp->idev->cnf.forwarding == 2) &&
2970            ifp->idev->cnf.rtr_solicits > 0 &&
2971            (dev->flags&IFF_LOOPBACK) == 0 &&
2972            (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2973                /*
2974                 *      If a host as already performed a random delay
2975                 *      [...] as part of DAD [...] there is no need
2976                 *      to delay again before sending the first RS
2977                 */
2978                ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2979
2980                spin_lock_bh(&ifp->lock);
2981                ifp->probes = 1;
2982                ifp->idev->if_flags |= IF_RS_SENT;
2983                addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2984                spin_unlock_bh(&ifp->lock);
2985        }
2986}
2987
2988static void addrconf_dad_run(struct inet6_dev *idev)
2989{
2990        struct inet6_ifaddr *ifp;
2991
2992        read_lock_bh(&idev->lock);
2993        list_for_each_entry(ifp, &idev->addr_list, if_list) {
2994                spin_lock(&ifp->lock);
2995                if (ifp->flags & IFA_F_TENTATIVE &&
2996                    ifp->state == INET6_IFADDR_STATE_DAD)
2997                        addrconf_dad_kick(ifp);
2998                spin_unlock(&ifp->lock);
2999        }
3000        read_unlock_bh(&idev->lock);
3001}
3002
3003#ifdef CONFIG_PROC_FS
3004struct if6_iter_state {
3005        struct seq_net_private p;
3006        int bucket;
3007};
3008
3009static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3010{
3011        struct inet6_ifaddr *ifa = NULL;
3012        struct if6_iter_state *state = seq->private;
3013        struct net *net = seq_file_net(seq);
3014
3015        for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3016                struct hlist_node *n;
3017                hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3018                                         addr_lst)
3019                        if (net_eq(dev_net(ifa->idev->dev), net))
3020                                return ifa;
3021        }
3022        return NULL;
3023}
3024
3025static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3026                                         struct inet6_ifaddr *ifa)
3027{
3028        struct if6_iter_state *state = seq->private;
3029        struct net *net = seq_file_net(seq);
3030        struct hlist_node *n = &ifa->addr_lst;
3031
3032        hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3033                if (net_eq(dev_net(ifa->idev->dev), net))
3034                        return ifa;
3035
3036        while (++state->bucket < IN6_ADDR_HSIZE) {
3037                hlist_for_each_entry_rcu_bh(ifa, n,
3038                                     &inet6_addr_lst[state->bucket], addr_lst) {
3039                        if (net_eq(dev_net(ifa->idev->dev), net))
3040                                return ifa;
3041                }
3042        }
3043
3044        return NULL;
3045}
3046
3047static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3048{
3049        struct inet6_ifaddr *ifa = if6_get_first(seq);
3050
3051        if (ifa)
3052                while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3053                        --pos;
3054        return pos ? NULL : ifa;
3055}
3056
3057static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3058        __acquires(rcu_bh)
3059{
3060        rcu_read_lock_bh();
3061        return if6_get_idx(seq, *pos);
3062}
3063
3064static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3065{
3066        struct inet6_ifaddr *ifa;
3067
3068        ifa = if6_get_next(seq, v);
3069        ++*pos;
3070        return ifa;
3071}
3072
3073static void if6_seq_stop(struct seq_file *seq, void *v)
3074        __releases(rcu_bh)
3075{
3076        rcu_read_unlock_bh();
3077}
3078
3079static int if6_seq_show(struct seq_file *seq, void *v)
3080{
3081        struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3082        seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3083                   &ifp->addr,
3084                   ifp->idev->dev->ifindex,
3085                   ifp->prefix_len,
3086                   ifp->scope,
3087                   ifp->flags,
3088                   ifp->idev->dev->name);
3089        return 0;
3090}
3091
3092static const struct seq_operations if6_seq_ops = {
3093        .start  = if6_seq_start,
3094        .next   = if6_seq_next,
3095        .show   = if6_seq_show,
3096        .stop   = if6_seq_stop,
3097};
3098
3099static int if6_seq_open(struct inode *inode, struct file *file)
3100{
3101        return seq_open_net(inode, file, &if6_seq_ops,
3102                            sizeof(struct if6_iter_state));
3103}
3104
3105static const struct file_operations if6_fops = {
3106        .owner          = THIS_MODULE,
3107        .open           = if6_seq_open,
3108        .read           = seq_read,
3109        .llseek         = seq_lseek,
3110        .release        = seq_release_net,
3111};
3112
3113static int __net_init if6_proc_net_init(struct net *net)
3114{
3115        if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3116                return -ENOMEM;
3117        return 0;
3118}
3119
3120static void __net_exit if6_proc_net_exit(struct net *net)
3121{
3122       proc_net_remove(net, "if_inet6");
3123}
3124
3125static struct pernet_operations if6_proc_net_ops = {
3126       .init = if6_proc_net_init,
3127       .exit = if6_proc_net_exit,
3128};
3129
3130int __init if6_proc_init(void)
3131{
3132        return register_pernet_subsys(&if6_proc_net_ops);
3133}
3134
3135void if6_proc_exit(void)
3136{
3137        unregister_pernet_subsys(&if6_proc_net_ops);
3138}
3139#endif  /* CONFIG_PROC_FS */
3140
3141#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3142/* Check if address is a home address configured on any interface. */
3143int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3144{
3145        int ret = 0;
3146        struct inet6_ifaddr *ifp = NULL;
3147        struct hlist_node *n;
3148        unsigned int hash = ipv6_addr_hash(addr);
3149
3150        rcu_read_lock_bh();
3151        hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3152                if (!net_eq(dev_net(ifp->idev->dev), net))
3153                        continue;
3154                if (ipv6_addr_equal(&ifp->addr, addr) &&
3155                    (ifp->flags & IFA_F_HOMEADDRESS)) {
3156                        ret = 1;
3157                        break;
3158                }
3159        }
3160        rcu_read_unlock_bh();
3161        return ret;
3162}
3163#endif
3164
3165/*
3166 *      Periodic address status verification
3167 */
3168
3169static void addrconf_verify(unsigned long foo)
3170{
3171        unsigned long now, next, next_sec, next_sched;
3172        struct inet6_ifaddr *ifp;
3173        struct hlist_node *node;
3174        int i;
3175
3176        rcu_read_lock_bh();
3177        spin_lock(&addrconf_verify_lock);
3178        now = jiffies;
3179        next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3180
3181        del_timer(&addr_chk_timer);
3182
3183        for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3184restart:
3185                hlist_for_each_entry_rcu_bh(ifp, node,
3186                                         &inet6_addr_lst[i], addr_lst) {
3187                        unsigned long age;
3188
3189                        if (ifp->flags & IFA_F_PERMANENT)
3190                                continue;
3191
3192                        spin_lock(&ifp->lock);
3193                        /* We try to batch several events at once. */
3194                        age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3195
3196                        if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3197                            age >= ifp->valid_lft) {
3198                                spin_unlock(&ifp->lock);
3199                                in6_ifa_hold(ifp);
3200                                ipv6_del_addr(ifp);
3201                                goto restart;
3202                        } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3203                                spin_unlock(&ifp->lock);
3204                                continue;
3205                        } else if (age >= ifp->prefered_lft) {
3206                                /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3207                                int deprecate = 0;
3208
3209                                if (!(ifp->flags&IFA_F_DEPRECATED)) {
3210                                        deprecate = 1;
3211                                        ifp->flags |= IFA_F_DEPRECATED;
3212                                }
3213
3214                                if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3215                                        next = ifp->tstamp + ifp->valid_lft * HZ;
3216
3217                                spin_unlock(&ifp->lock);
3218
3219                                if (deprecate) {
3220                                        in6_ifa_hold(ifp);
3221
3222                                        ipv6_ifa_notify(0, ifp);
3223                                        in6_ifa_put(ifp);
3224                                        goto restart;
3225                                }
3226#ifdef CONFIG_IPV6_PRIVACY
3227                        } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3228                                   !(ifp->flags&IFA_F_TENTATIVE)) {
3229                                unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3230                                        ifp->idev->cnf.dad_transmits *
3231                                        ifp->idev->nd_parms->retrans_time / HZ;
3232
3233                                if (age >= ifp->prefered_lft - regen_advance) {
3234                                        struct inet6_ifaddr *ifpub = ifp->ifpub;
3235                                        if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3236                                                next = ifp->tstamp + ifp->prefered_lft * HZ;
3237                                        if (!ifp->regen_count && ifpub) {
3238                                                ifp->regen_count++;
3239                                                in6_ifa_hold(ifp);
3240                                                in6_ifa_hold(ifpub);
3241                                                spin_unlock(&ifp->lock);
3242
3243                                                spin_lock(&ifpub->lock);
3244                                                ifpub->regen_count = 0;
3245                                                spin_unlock(&ifpub->lock);
3246                                                ipv6_create_tempaddr(ifpub, ifp);
3247                                                in6_ifa_put(ifpub);
3248                                                in6_ifa_put(ifp);
3249                                                goto restart;
3250                                        }
3251                                } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3252                                        next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3253                                spin_unlock(&ifp->lock);
3254#endif
3255                        } else {
3256                                /* ifp->prefered_lft <= ifp->valid_lft */
3257                                if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3258                                        next = ifp->tstamp + ifp->prefered_lft * HZ;
3259                                spin_unlock(&ifp->lock);
3260                        }
3261                }
3262        }
3263
3264        next_sec = round_jiffies_up(next);
3265        next_sched = next;
3266
3267        /* If rounded timeout is accurate enough, accept it. */
3268        if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3269                next_sched = next_sec;
3270
3271        /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3272        if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3273                next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3274
3275        ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3276              now, next, next_sec, next_sched));
3277
3278        addr_chk_timer.expires = next_sched;
3279        add_timer(&addr_chk_timer);
3280        spin_unlock(&addrconf_verify_lock);
3281        rcu_read_unlock_bh();
3282}
3283
3284static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3285{
3286        struct in6_addr *pfx = NULL;
3287
3288        if (addr)
3289                pfx = nla_data(addr);
3290
3291        if (local) {
3292                if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3293                        pfx = NULL;
3294                else
3295                        pfx = nla_data(local);
3296        }
3297
3298        return pfx;
3299}
3300
3301static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3302        [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3303        [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3304        [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3305};
3306
3307static int
3308inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3309{
3310        struct net *net = sock_net(skb->sk);
3311        struct ifaddrmsg *ifm;
3312        struct nlattr *tb[IFA_MAX+1];
3313        struct in6_addr *pfx;
3314        int err;
3315
3316        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3317        if (err < 0)
3318                return err;
3319
3320        ifm = nlmsg_data(nlh);
3321        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3322        if (pfx == NULL)
3323                return -EINVAL;
3324
3325        return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3326}
3327
3328static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3329                             u32 prefered_lft, u32 valid_lft)
3330{
3331        u32 flags;
3332        clock_t expires;
3333        unsigned long timeout;
3334
3335        if (!valid_lft || (prefered_lft > valid_lft))
3336                return -EINVAL;
3337
3338        timeout = addrconf_timeout_fixup(valid_lft, HZ);
3339        if (addrconf_finite_timeout(timeout)) {
3340                expires = jiffies_to_clock_t(timeout * HZ);
3341                valid_lft = timeout;
3342                flags = RTF_EXPIRES;
3343        } else {
3344                expires = 0;
3345                flags = 0;
3346                ifa_flags |= IFA_F_PERMANENT;
3347        }
3348
3349        timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3350        if (addrconf_finite_timeout(timeout)) {
3351                if (timeout == 0)
3352                        ifa_flags |= IFA_F_DEPRECATED;
3353                prefered_lft = timeout;
3354        }
3355
3356        spin_lock_bh(&ifp->lock);
3357        ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3358        ifp->tstamp = jiffies;
3359        ifp->valid_lft = valid_lft;
3360        ifp->prefered_lft = prefered_lft;
3361
3362        spin_unlock_bh(&ifp->lock);
3363        if (!(ifp->flags&IFA_F_TENTATIVE))
3364                ipv6_ifa_notify(0, ifp);
3365
3366        addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3367                              expires, flags);
3368        addrconf_verify(0);
3369
3370        return 0;
3371}
3372
3373static int
3374inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3375{
3376        struct net *net = sock_net(skb->sk);
3377        struct ifaddrmsg *ifm;
3378        struct nlattr *tb[IFA_MAX+1];
3379        struct in6_addr *pfx;
3380        struct inet6_ifaddr *ifa;
3381        struct net_device *dev;
3382        u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3383        u8 ifa_flags;
3384        int err;
3385
3386        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3387        if (err < 0)
3388                return err;
3389
3390        ifm = nlmsg_data(nlh);
3391        pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3392        if (pfx == NULL)
3393                return -EINVAL;
3394
3395        if (tb[IFA_CACHEINFO]) {
3396                struct ifa_cacheinfo *ci;
3397
3398                ci = nla_data(tb[IFA_CACHEINFO]);
3399                valid_lft = ci->ifa_valid;
3400                preferred_lft = ci->ifa_prefered;
3401        } else {
3402                preferred_lft = INFINITY_LIFE_TIME;
3403                valid_lft = INFINITY_LIFE_TIME;
3404        }
3405
3406        dev =  __dev_get_by_index(net, ifm->ifa_index);
3407        if (dev == NULL)
3408                return -ENODEV;
3409
3410        /* We ignore other flags so far. */
3411        ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3412
3413        ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3414        if (ifa == NULL) {
3415                /*
3416                 * It would be best to check for !NLM_F_CREATE here but
3417                 * userspace alreay relies on not having to provide this.
3418                 */
3419                return inet6_addr_add(net, ifm->ifa_index, pfx,
3420                                      ifm->ifa_prefixlen, ifa_flags,
3421                                      preferred_lft, valid_lft);
3422        }
3423
3424        if (nlh->nlmsg_flags & NLM_F_EXCL ||
3425            !(nlh->nlmsg_flags & NLM_F_REPLACE))
3426                err = -EEXIST;
3427        else
3428                err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3429
3430        in6_ifa_put(ifa);
3431
3432        return err;
3433}
3434
3435static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3436                          u8 scope, int ifindex)
3437{
3438        struct ifaddrmsg *ifm;
3439
3440        ifm = nlmsg_data(nlh);
3441        ifm->ifa_family = AF_INET6;
3442        ifm->ifa_prefixlen = prefixlen;
3443        ifm->ifa_flags = flags;
3444        ifm->ifa_scope = scope;
3445        ifm->ifa_index = ifindex;
3446}
3447
3448static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3449                         unsigned long tstamp, u32 preferred, u32 valid)
3450{
3451        struct ifa_cacheinfo ci;
3452
3453        ci.cstamp = cstamp_delta(cstamp);
3454        ci.tstamp = cstamp_delta(tstamp);
3455        ci.ifa_prefered = preferred;
3456        ci.ifa_valid = valid;
3457
3458        return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3459}
3460
3461static inline int rt_scope(int ifa_scope)
3462{
3463        if (ifa_scope & IFA_HOST)
3464                return RT_SCOPE_HOST;
3465        else if (ifa_scope & IFA_LINK)
3466                return RT_SCOPE_LINK;
3467        else if (ifa_scope & IFA_SITE)
3468                return RT_SCOPE_SITE;
3469        else
3470                return RT_SCOPE_UNIVERSE;
3471}
3472
3473static inline int inet6_ifaddr_msgsize(void)
3474{
3475        return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3476               + nla_total_size(16) /* IFA_ADDRESS */
3477               + nla_total_size(sizeof(struct ifa_cacheinfo));
3478}
3479
3480static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3481                             u32 pid, u32 seq, int event, unsigned int flags)
3482{
3483        struct nlmsghdr  *nlh;
3484        u32 preferred, valid;
3485
3486        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3487        if (nlh == NULL)
3488                return -EMSGSIZE;
3489
3490        put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3491                      ifa->idev->dev->ifindex);
3492
3493        if (!(ifa->flags&IFA_F_PERMANENT)) {
3494                preferred = ifa->prefered_lft;
3495                valid = ifa->valid_lft;
3496                if (preferred != INFINITY_LIFE_TIME) {
3497                        long tval = (jiffies - ifa->tstamp)/HZ;
3498                        if (preferred > tval)
3499                                preferred -= tval;
3500                        else
3501                                preferred = 0;
3502                        if (valid != INFINITY_LIFE_TIME) {
3503                                if (valid > tval)
3504                                        valid -= tval;
3505                                else
3506                                        valid = 0;
3507                        }
3508                }
3509        } else {
3510                preferred = INFINITY_LIFE_TIME;
3511                valid = INFINITY_LIFE_TIME;
3512        }
3513
3514        if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3515            put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3516                nlmsg_cancel(skb, nlh);
3517                return -EMSGSIZE;
3518        }
3519
3520        return nlmsg_end(skb, nlh);
3521}
3522
3523static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3524                                u32 pid, u32 seq, int event, u16 flags)
3525{
3526        struct nlmsghdr  *nlh;
3527        u8 scope = RT_SCOPE_UNIVERSE;
3528        int ifindex = ifmca->idev->dev->ifindex;
3529
3530        if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3531                scope = RT_SCOPE_SITE;
3532
3533        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3534        if (nlh == NULL)
3535                return -EMSGSIZE;
3536
3537        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3538        if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3539            put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3540                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3541                nlmsg_cancel(skb, nlh);
3542                return -EMSGSIZE;
3543        }
3544
3545        return nlmsg_end(skb, nlh);
3546}
3547
3548static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3549                                u32 pid, u32 seq, int event, unsigned int flags)
3550{
3551        struct nlmsghdr  *nlh;
3552        u8 scope = RT_SCOPE_UNIVERSE;
3553        int ifindex = ifaca->aca_idev->dev->ifindex;
3554
3555        if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3556                scope = RT_SCOPE_SITE;
3557
3558        nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3559        if (nlh == NULL)
3560                return -EMSGSIZE;
3561
3562        put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3563        if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3564            put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3565                          INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3566                nlmsg_cancel(skb, nlh);
3567                return -EMSGSIZE;
3568        }
3569
3570        return nlmsg_end(skb, nlh);
3571}
3572
3573enum addr_type_t {
3574        UNICAST_ADDR,
3575        MULTICAST_ADDR,
3576        ANYCAST_ADDR,
3577};
3578
3579/* called with rcu_read_lock() */
3580static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3581                          struct netlink_callback *cb, enum addr_type_t type,
3582                          int s_ip_idx, int *p_ip_idx)
3583{
3584        struct ifmcaddr6 *ifmca;
3585        struct ifacaddr6 *ifaca;
3586        int err = 1;
3587        int ip_idx = *p_ip_idx;
3588
3589        read_lock_bh(&idev->lock);
3590        switch (type) {
3591        case UNICAST_ADDR: {
3592                struct inet6_ifaddr *ifa;
3593
3594                /* unicast address incl. temp addr */
3595                list_for_each_entry(ifa, &idev->addr_list, if_list) {
3596                        if (++ip_idx < s_ip_idx)
3597                                continue;
3598                        err = inet6_fill_ifaddr(skb, ifa,
3599                                                NETLINK_CB(cb->skb).pid,
3600                                                cb->nlh->nlmsg_seq,
3601                                                RTM_NEWADDR,
3602                                                NLM_F_MULTI);
3603                        if (err <= 0)
3604                                break;
3605                }
3606                break;
3607        }
3608        case MULTICAST_ADDR:
3609                /* multicast address */
3610                for (ifmca = idev->mc_list; ifmca;
3611                     ifmca = ifmca->next, ip_idx++) {
3612                        if (ip_idx < s_ip_idx)
3613                                continue;
3614                        err = inet6_fill_ifmcaddr(skb, ifmca,
3615                                                  NETLINK_CB(cb->skb).pid,
3616                                                  cb->nlh->nlmsg_seq,
3617                                                  RTM_GETMULTICAST,
3618                                                  NLM_F_MULTI);
3619                        if (err <= 0)
3620                                break;
3621                }
3622                break;
3623        case ANYCAST_ADDR:
3624                /* anycast address */
3625                for (ifaca = idev->ac_list; ifaca;
3626                     ifaca = ifaca->aca_next, ip_idx++) {
3627                        if (ip_idx < s_ip_idx)
3628                                continue;
3629                        err = inet6_fill_ifacaddr(skb, ifaca,
3630                                                  NETLINK_CB(cb->skb).pid,
3631                                                  cb->nlh->nlmsg_seq,
3632                                                  RTM_GETANYCAST,
3633                                                  NLM_F_MULTI);
3634                        if (err <= 0)
3635                                break;
3636                }
3637                break;
3638        default:
3639                break;
3640        }
3641        read_unlock_bh(&idev->lock);
3642        *p_ip_idx = ip_idx;
3643        return err;
3644}
3645
3646static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3647                           enum addr_type_t type)
3648{
3649        struct net *net = sock_net(skb->sk);
3650        int h, s_h;
3651        int idx, ip_idx;
3652        int s_idx, s_ip_idx;
3653        struct net_device *dev;
3654        struct inet6_dev *idev;
3655        struct hlist_head *head;
3656        struct hlist_node *node;
3657
3658        s_h = cb->args[0];
3659        s_idx = idx = cb->args[1];
3660        s_ip_idx = ip_idx = cb->args[2];
3661
3662        rcu_read_lock();
3663        for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3664                idx = 0;
3665                head = &net->dev_index_head[h];
3666                hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3667                        if (idx < s_idx)
3668                                goto cont;
3669                        if (h > s_h || idx > s_idx)
3670                                s_ip_idx = 0;
3671                        ip_idx = 0;
3672                        idev = __in6_dev_get(dev);
3673                        if (!idev)
3674                                goto cont;
3675
3676                        if (in6_dump_addrs(idev, skb, cb, type,
3677                                           s_ip_idx, &ip_idx) <= 0)
3678                                goto done;
3679cont:
3680                        idx++;
3681                }
3682        }
3683done:
3684        rcu_read_unlock();
3685        cb->args[0] = h;
3686        cb->args[1] = idx;
3687        cb->args[2] = ip_idx;
3688
3689        return skb->len;
3690}
3691
3692static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3693{
3694        enum addr_type_t type = UNICAST_ADDR;
3695
3696        return inet6_dump_addr(skb, cb, type);
3697}
3698
3699static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3700{
3701        enum addr_type_t type = MULTICAST_ADDR;
3702
3703        return inet6_dump_addr(skb, cb, type);
3704}
3705
3706
3707static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3708{
3709        enum addr_type_t type = ANYCAST_ADDR;
3710
3711        return inet6_dump_addr(skb, cb, type);
3712}
3713
3714static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3715                             void *arg)
3716{
3717        struct net *net = sock_net(in_skb->sk);
3718        struct ifaddrmsg *ifm;
3719        struct nlattr *tb[IFA_MAX+1];
3720        struct in6_addr *addr = NULL;
3721        struct net_device *dev = NULL;
3722        struct inet6_ifaddr *ifa;
3723        struct sk_buff *skb;
3724        int err;
3725
3726        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3727        if (err < 0)
3728                goto errout;
3729
3730        addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3731        if (addr == NULL) {
3732                err = -EINVAL;
3733                goto errout;
3734        }
3735
3736        ifm = nlmsg_data(nlh);
3737        if (ifm->ifa_index)
3738                dev = __dev_get_by_index(net, ifm->ifa_index);
3739
3740        ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3741        if (!ifa) {
3742                err = -EADDRNOTAVAIL;
3743                goto errout;
3744        }
3745
3746        skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3747        if (!skb) {
3748                err = -ENOBUFS;
3749                goto errout_ifa;
3750        }
3751
3752        err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3753                                nlh->nlmsg_seq, RTM_NEWADDR, 0);
3754        if (err < 0) {
3755                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3756                WARN_ON(err == -EMSGSIZE);
3757                kfree_skb(skb);
3758                goto errout_ifa;
3759        }
3760        err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3761errout_ifa:
3762        in6_ifa_put(ifa);
3763errout:
3764        return err;
3765}
3766
3767static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3768{
3769        struct sk_buff *skb;
3770        struct net *net = dev_net(ifa->idev->dev);
3771        int err = -ENOBUFS;
3772
3773        skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3774        if (skb == NULL)
3775                goto errout;
3776
3777        err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3778        if (err < 0) {
3779                /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3780                WARN_ON(err == -EMSGSIZE);
3781                kfree_skb(skb);
3782                goto errout;
3783        }
3784        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3785        return;
3786errout:
3787        if (err < 0)
3788                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3789}
3790
3791static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3792                                __s32 *array, int bytes)
3793{
3794        BUG_ON(bytes < (DEVCONF_MAX * 4));
3795
3796        memset(array, 0, bytes);
3797        array[DEVCONF_FORWARDING] = cnf->forwarding;
3798        array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3799        array[DEVCONF_MTU6] = cnf->mtu6;
3800        array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3801        array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3802        array[DEVCONF_AUTOCONF] = cnf->autoconf;
3803        array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3804        array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3805        array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3806                jiffies_to_msecs(cnf->rtr_solicit_interval);
3807        array[DEVCONF_RTR_SOLICIT_DELAY] =
3808                jiffies_to_msecs(cnf->rtr_solicit_delay);
3809        array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3810#ifdef CONFIG_IPV6_PRIVACY
3811        array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3812        array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3813        array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3814        array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3815        array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3816#endif
3817        array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3818        array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3819        array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3820#ifdef CONFIG_IPV6_ROUTER_PREF
3821        array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3822        array[DEVCONF_RTR_PROBE_INTERVAL] =
3823                jiffies_to_msecs(cnf->rtr_probe_interval);
3824#ifdef CONFIG_IPV6_ROUTE_INFO
3825        array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3826#endif
3827#endif
3828        array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3829        array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3830#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3831        array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3832#endif
3833#ifdef CONFIG_IPV6_MROUTE
3834        array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3835#endif
3836        array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3837        array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3838        array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3839}
3840
3841static inline size_t inet6_if_nlmsg_size(void)
3842{
3843        return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3844               + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3845               + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3846               + nla_total_size(4) /* IFLA_MTU */
3847               + nla_total_size(4) /* IFLA_LINK */
3848               + nla_total_size( /* IFLA_PROTINFO */
3849                        nla_total_size(4) /* IFLA_INET6_FLAGS */
3850                        + nla_total_size(sizeof(struct ifla_cacheinfo))
3851                        + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3852                        + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3853                        + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3854                 );
3855}
3856
3857static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3858                                      int items, int bytes)
3859{
3860        int i;
3861        int pad = bytes - sizeof(u64) * items;
3862        BUG_ON(pad < 0);
3863
3864        /* Use put_unaligned() because stats may not be aligned for u64. */
3865        put_unaligned(items, &stats[0]);
3866        for (i = 1; i < items; i++)
3867                put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3868
3869        memset(&stats[items], 0, pad);
3870}
3871
3872static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3873                                      int items, int bytes, size_t syncpoff)
3874{
3875        int i;
3876        int pad = bytes - sizeof(u64) * items;
3877        BUG_ON(pad < 0);
3878
3879        /* Use put_unaligned() because stats may not be aligned for u64. */
3880        put_unaligned(items, &stats[0]);
3881        for (i = 1; i < items; i++)
3882                put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3883
3884        memset(&stats[items], 0, pad);
3885}
3886
3887static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3888                             int bytes)
3889{
3890        switch (attrtype) {
3891        case IFLA_INET6_STATS:
3892                __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3893                                     IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3894                break;
3895        case IFLA_INET6_ICMP6STATS:
3896                __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3897                break;
3898        }
3899}
3900
3901static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3902                             u32 pid, u32 seq, int event, unsigned int flags)
3903{
3904        struct net_device *dev = idev->dev;
3905        struct nlattr *nla;
3906        struct ifinfomsg *hdr;
3907        struct nlmsghdr *nlh;
3908        void *protoinfo;
3909        struct ifla_cacheinfo ci;
3910
3911        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3912        if (nlh == NULL)
3913                return -EMSGSIZE;
3914
3915        hdr = nlmsg_data(nlh);
3916        hdr->ifi_family = AF_INET6;
3917        hdr->__ifi_pad = 0;
3918        hdr->ifi_type = dev->type;
3919        hdr->ifi_index = dev->ifindex;
3920        hdr->ifi_flags = dev_get_flags(dev);
3921        hdr->ifi_change = 0;
3922
3923        NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3924
3925        if (dev->addr_len)
3926                NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3927
3928        NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3929        if (dev->ifindex != dev->iflink)
3930                NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3931
3932        protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3933        if (protoinfo == NULL)
3934                goto nla_put_failure;
3935
3936        NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3937
3938        ci.max_reasm_len = IPV6_MAXPLEN;
3939        ci.tstamp = cstamp_delta(idev->tstamp);
3940        ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3941        ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3942        NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3943
3944        nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3945        if (nla == NULL)
3946                goto nla_put_failure;
3947        ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3948
3949        /* XXX - MC not implemented */
3950
3951        nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3952        if (nla == NULL)
3953                goto nla_put_failure;
3954        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3955
3956        nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3957        if (nla == NULL)
3958                goto nla_put_failure;
3959        snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3960
3961        nla_nest_end(skb, protoinfo);
3962        return nlmsg_end(skb, nlh);
3963
3964nla_put_failure:
3965        nlmsg_cancel(skb, nlh);
3966        return -EMSGSIZE;
3967}
3968
3969static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3970{
3971        struct net *net = sock_net(skb->sk);
3972        int h, s_h;
3973        int idx = 0, s_idx;
3974        struct net_device *dev;
3975        struct inet6_dev *idev;
3976        struct hlist_head *head;
3977        struct hlist_node *node;
3978
3979        s_h = cb->args[0];
3980        s_idx = cb->args[1];
3981
3982        rcu_read_lock();
3983        for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3984                idx = 0;
3985                head = &net->dev_index_head[h];
3986                hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3987                        if (idx < s_idx)
3988                                goto cont;
3989                        idev = __in6_dev_get(dev);
3990                        if (!idev)
3991                                goto cont;
3992                        if (inet6_fill_ifinfo(skb, idev,
3993                                              NETLINK_CB(cb->skb).pid,
3994                                              cb->nlh->nlmsg_seq,
3995                                              RTM_NEWLINK, NLM_F_MULTI) <= 0)
3996                                goto out;
3997cont:
3998                        idx++;
3999                }
4000        }
4001out:
4002        rcu_read_unlock();
4003        cb->args[1] = idx;
4004        cb->args[0] = h;
4005
4006        return skb->len;
4007}
4008
4009void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4010{
4011        struct sk_buff *skb;
4012        struct net *net = dev_net(idev->dev);
4013        int err = -ENOBUFS;
4014
4015        skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4016        if (skb == NULL)
4017                goto errout;
4018
4019        err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4020        if (err < 0) {
4021                /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4022                WARN_ON(err == -EMSGSIZE);
4023                kfree_skb(skb);
4024                goto errout;
4025        }
4026        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4027        return;
4028errout:
4029        if (err < 0)
4030                rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4031}
4032
4033static inline size_t inet6_prefix_nlmsg_size(void)
4034{
4035        return NLMSG_ALIGN(sizeof(struct prefixmsg))
4036               + nla_total_size(sizeof(struct in6_addr))
4037               + nla_total_size(sizeof(struct prefix_cacheinfo));
4038}
4039
4040static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4041                             struct prefix_info *pinfo, u32 pid, u32 seq,
4042                             int event, unsigned int flags)
4043{
4044        struct prefixmsg *pmsg;
4045        struct nlmsghdr *nlh;
4046        struct prefix_cacheinfo ci;
4047
4048        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4049        if (nlh == NULL)
4050                return -EMSGSIZE;
4051
4052        pmsg = nlmsg_data(nlh);
4053        pmsg->prefix_family = AF_INET6;
4054        pmsg->prefix_pad1 = 0;
4055        pmsg->prefix_pad2 = 0;
4056        pmsg->prefix_ifindex = idev->dev->ifindex;
4057        pmsg->prefix_len = pinfo->prefix_len;
4058        pmsg->prefix_type = pinfo->type;
4059        pmsg->prefix_pad3 = 0;
4060        pmsg->prefix_flags = 0;
4061        if (pinfo->onlink)
4062                pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4063        if (pinfo->autoconf)
4064                pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4065
4066        NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4067
4068        ci.preferred_time = ntohl(pinfo->prefered);
4069        ci.valid_time = ntohl(pinfo->valid);
4070        NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4071
4072        return nlmsg_end(skb, nlh);
4073
4074nla_put_failure:
4075        nlmsg_cancel(skb, nlh);
4076        return -EMSGSIZE;
4077}
4078
4079static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4080                         struct prefix_info *pinfo)
4081{
4082        struct sk_buff *skb;
4083        struct net *net = dev_net(idev->dev);
4084        int err = -ENOBUFS;
4085
4086        skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4087        if (skb == NULL)
4088                goto errout;
4089
4090        err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4091        if (err < 0) {
4092                /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4093                WARN_ON(err == -EMSGSIZE);
4094                kfree_skb(skb);
4095                goto errout;
4096        }
4097        rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4098        return;
4099errout:
4100        if (err < 0)
4101                rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4102}
4103
4104static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4105{
4106        inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4107
4108        switch (event) {
4109        case RTM_NEWADDR:
4110                /*
4111                 * If the address was optimistic
4112                 * we inserted the route at the start of
4113                 * our DAD process, so we don't need
4114                 * to do it again
4115                 */
4116                if (!(ifp->rt->rt6i_node))
4117                        ip6_ins_rt(ifp->rt);
4118                if (ifp->idev->cnf.forwarding)
4119                        addrconf_join_anycast(ifp);
4120                break;
4121        case RTM_DELADDR:
4122                if (ifp->idev->cnf.forwarding)
4123                        addrconf_leave_anycast(ifp);
4124                addrconf_leave_solict(ifp->idev, &ifp->addr);
4125                dst_hold(&ifp->rt->dst);
4126
4127                if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4128                    ip6_del_rt(ifp->rt))
4129                        dst_free(&ifp->rt->dst);
4130                break;
4131        }
4132}
4133
4134static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4135{
4136        rcu_read_lock_bh();
4137        if (likely(ifp->idev->dead == 0))
4138                __ipv6_ifa_notify(event, ifp);
4139        rcu_read_unlock_bh();
4140}
4141
4142#ifdef CONFIG_SYSCTL
4143
4144static
4145int addrconf_sysctl_forward(ctl_table *ctl, int write,
4146                           void __user *buffer, size_t *lenp, loff_t *ppos)
4147{
4148        int *valp = ctl->data;
4149        int val = *valp;
4150        loff_t pos = *ppos;
4151        int ret;
4152
4153        ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4154
4155        if (write)
4156                ret = addrconf_fixup_forwarding(ctl, valp, val);
4157        if (ret)
4158                *ppos = pos;
4159        return ret;
4160}
4161
4162static void dev_disable_change(struct inet6_dev *idev)
4163{
4164        if (!idev || !idev->dev)
4165                return;
4166
4167        if (idev->cnf.disable_ipv6)
4168                addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4169        else
4170                addrconf_notify(NULL, NETDEV_UP, idev->dev);
4171}
4172
4173static void addrconf_disable_change(struct net *net, __s32 newf)
4174{
4175        struct net_device *dev;
4176        struct inet6_dev *idev;
4177
4178        rcu_read_lock();
4179        for_each_netdev_rcu(net, dev) {
4180                idev = __in6_dev_get(dev);
4181                if (idev) {
4182                        int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4183                        idev->cnf.disable_ipv6 = newf;
4184                        if (changed)
4185                                dev_disable_change(idev);
4186                }
4187        }
4188        rcu_read_unlock();
4189}
4190
4191static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4192{
4193        struct net *net;
4194
4195        net = (struct net *)table->extra2;
4196
4197        if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4198                return 0;
4199
4200        if (!rtnl_trylock()) {
4201                /* Restore the original values before restarting */
4202                *p = old;
4203                return restart_syscall();
4204        }
4205
4206        if (p == &net->ipv6.devconf_all->disable_ipv6) {
4207                __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4208                net->ipv6.devconf_dflt->disable_ipv6 = newf;
4209                addrconf_disable_change(net, newf);
4210        } else if ((!*p) ^ (!old))
4211                dev_disable_change((struct inet6_dev *)table->extra1);
4212
4213        rtnl_unlock();
4214        return 0;
4215}
4216
4217static
4218int addrconf_sysctl_disable(ctl_table *ctl, int write,
4219                            void __user *buffer, size_t *lenp, loff_t *ppos)
4220{
4221        int *valp = ctl->data;
4222        int val = *valp;
4223        loff_t pos = *ppos;
4224        int ret;
4225
4226        ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4227
4228        if (write)
4229                ret = addrconf_disable_ipv6(ctl, valp, val);
4230        if (ret)
4231                *ppos = pos;
4232        return ret;
4233}
4234
4235static struct addrconf_sysctl_table
4236{
4237        struct ctl_table_header *sysctl_header;
4238        ctl_table addrconf_vars[DEVCONF_MAX+1];
4239        char *dev_name;
4240} addrconf_sysctl __read_mostly = {
4241        .sysctl_header = NULL,
4242        .addrconf_vars = {
4243                {
4244                        .procname       = "forwarding",
4245                        .data           = &ipv6_devconf.forwarding,
4246                        .maxlen         = sizeof(int),
4247                        .mode           = 0644,
4248                        .proc_handler   = addrconf_sysctl_forward,
4249                },
4250                {
4251                        .procname       = "hop_limit",
4252                        .data           = &ipv6_devconf.hop_limit,
4253                        .maxlen         = sizeof(int),
4254                        .mode           = 0644,
4255                        .proc_handler   = proc_dointvec,
4256                },
4257                {
4258                        .procname       = "mtu",
4259                        .data           = &ipv6_devconf.mtu6,
4260                        .maxlen         = sizeof(int),
4261                        .mode           = 0644,
4262                        .proc_handler   = proc_dointvec,
4263                },
4264                {
4265                        .procname       = "accept_ra",
4266                        .data           = &ipv6_devconf.accept_ra,
4267                        .maxlen         = sizeof(int),
4268                        .mode           = 0644,
4269                        .proc_handler   = proc_dointvec,
4270                },
4271                {
4272                        .procname       = "accept_redirects",
4273                        .data           = &ipv6_devconf.accept_redirects,
4274                        .maxlen         = sizeof(int),
4275                        .mode           = 0644,
4276                        .proc_handler   = proc_dointvec,
4277                },
4278                {
4279                        .procname       = "autoconf",
4280                        .data           = &ipv6_devconf.autoconf,
4281                        .maxlen         = sizeof(int),
4282                        .mode           = 0644,
4283                        .proc_handler   = proc_dointvec,
4284                },
4285                {
4286                        .procname       = "dad_transmits",
4287                        .data           = &ipv6_devconf.dad_transmits,
4288                        .maxlen         = sizeof(int),
4289                        .mode           = 0644,
4290                        .proc_handler   = proc_dointvec,
4291                },
4292                {
4293                        .procname       = "router_solicitations",
4294                        .data           = &ipv6_devconf.rtr_solicits,
4295                        .maxlen         = sizeof(int),
4296                        .mode           = 0644,
4297                        .proc_handler   = proc_dointvec,
4298                },
4299                {
4300                        .procname       = "router_solicitation_interval",
4301                        .data           = &ipv6_devconf.rtr_solicit_interval,
4302                        .maxlen         = sizeof(int),
4303                        .mode           = 0644,
4304                        .proc_handler   = proc_dointvec_jiffies,
4305                },
4306                {
4307                        .procname       = "router_solicitation_delay",
4308                        .data           = &ipv6_devconf.rtr_solicit_delay,
4309                        .maxlen         = sizeof(int),
4310                        .mode           = 0644,
4311                        .proc_handler   = proc_dointvec_jiffies,
4312                },
4313                {
4314                        .procname       = "force_mld_version",
4315                        .data           = &ipv6_devconf.force_mld_version,
4316                        .maxlen         = sizeof(int),
4317                        .mode           = 0644,
4318                        .proc_handler   = proc_dointvec,
4319                },
4320#ifdef CONFIG_IPV6_PRIVACY
4321                {
4322                        .procname       = "use_tempaddr",
4323                        .data           = &ipv6_devconf.use_tempaddr,
4324                        .maxlen         = sizeof(int),
4325                        .mode           = 0644,
4326                        .proc_handler   = proc_dointvec,
4327                },
4328                {
4329                        .procname       = "temp_valid_lft",
4330                        .data           = &ipv6_devconf.temp_valid_lft,
4331                        .maxlen         = sizeof(int),
4332                        .mode           = 0644,
4333                        .proc_handler   = proc_dointvec,
4334                },
4335                {
4336                        .procname       = "temp_prefered_lft",
4337                        .data           = &ipv6_devconf.temp_prefered_lft,
4338                        .maxlen         = sizeof(int),
4339                        .mode           = 0644,
4340                        .proc_handler   = proc_dointvec,
4341                },
4342                {
4343                        .procname       = "regen_max_retry",
4344                        .data           = &ipv6_devconf.regen_max_retry,
4345                        .maxlen         = sizeof(int),
4346                        .mode           = 0644,
4347                        .proc_handler   = proc_dointvec,
4348                },
4349                {
4350                        .procname       = "max_desync_factor",
4351                        .data           = &ipv6_devconf.max_desync_factor,
4352                        .maxlen         = sizeof(int),
4353                        .mode           = 0644,
4354                        .proc_handler   = proc_dointvec,
4355                },
4356#endif
4357                {
4358                        .procname       = "max_addresses",
4359                        .data           = &ipv6_devconf.max_addresses,
4360                        .maxlen         = sizeof(int),
4361                        .mode           = 0644,
4362                        .proc_handler   = proc_dointvec,
4363                },
4364                {
4365                        .procname       = "accept_ra_defrtr",
4366                        .data           = &ipv6_devconf.accept_ra_defrtr,
4367                        .maxlen         = sizeof(int),
4368                        .mode           = 0644,
4369                        .proc_handler   = proc_dointvec,
4370                },
4371                {
4372                        .procname       = "accept_ra_pinfo",
4373                        .data           = &ipv6_devconf.accept_ra_pinfo,
4374                        .maxlen         = sizeof(int),
4375                        .mode           = 0644,
4376                        .proc_handler   = proc_dointvec,
4377                },
4378#ifdef CONFIG_IPV6_ROUTER_PREF
4379                {
4380                        .procname       = "accept_ra_rtr_pref",
4381                        .data           = &ipv6_devconf.accept_ra_rtr_pref,
4382                        .maxlen         = sizeof(int),
4383                        .mode           = 0644,
4384                        .proc_handler   = proc_dointvec,
4385                },
4386                {
4387                        .procname       = "router_probe_interval",
4388                        .data           = &ipv6_devconf.rtr_probe_interval,
4389                        .maxlen         = sizeof(int),
4390                        .mode           = 0644,
4391                        .proc_handler   = proc_dointvec_jiffies,
4392                },
4393#ifdef CONFIG_IPV6_ROUTE_INFO
4394                {
4395                        .procname       = "accept_ra_rt_info_max_plen",
4396                        .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4397                        .maxlen         = sizeof(int),
4398                        .mode           = 0644,
4399                        .proc_handler   = proc_dointvec,
4400                },
4401#endif
4402#endif
4403                {
4404                        .procname       = "proxy_ndp",
4405                        .data           = &ipv6_devconf.proxy_ndp,
4406                        .maxlen         = sizeof(int),
4407                        .mode           = 0644,
4408                        .proc_handler   = proc_dointvec,
4409                },
4410                {
4411                        .procname       = "accept_source_route",
4412                        .data           = &ipv6_devconf.accept_source_route,
4413                        .maxlen         = sizeof(int),
4414                        .mode           = 0644,
4415                        .proc_handler   = proc_dointvec,
4416                },
4417#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4418                {
4419                        .procname       = "optimistic_dad",
4420                        .data           = &ipv6_devconf.optimistic_dad,
4421                        .maxlen         = sizeof(int),
4422                        .mode           = 0644,
4423                        .proc_handler   = proc_dointvec,
4424
4425                },
4426#endif
4427#ifdef CONFIG_IPV6_MROUTE
4428                {
4429                        .procname       = "mc_forwarding",
4430                        .data           = &ipv6_devconf.mc_forwarding,
4431                        .maxlen         = sizeof(int),
4432                        .mode           = 0444,
4433                        .proc_handler   = proc_dointvec,
4434                },
4435#endif
4436                {
4437                        .procname       = "disable_ipv6",
4438                        .data           = &ipv6_devconf.disable_ipv6,
4439                        .maxlen         = sizeof(int),
4440                        .mode           = 0644,
4441                        .proc_handler   = addrconf_sysctl_disable,
4442                },
4443                {
4444                        .procname       = "accept_dad",
4445                        .data           = &ipv6_devconf.accept_dad,
4446                        .maxlen         = sizeof(int),
4447                        .mode           = 0644,
4448                        .proc_handler   = proc_dointvec,
4449                },
4450                {
4451                        .procname       = "force_tllao",
4452                        .data           = &ipv6_devconf.force_tllao,
4453                        .maxlen         = sizeof(int),
4454                        .mode           = 0644,
4455                        .proc_handler   = proc_dointvec
4456                },
4457                {
4458                        /* sentinel */
4459                }
4460        },
4461};
4462
4463static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4464                struct inet6_dev *idev, struct ipv6_devconf *p)
4465{
4466        int i;
4467        struct addrconf_sysctl_table *t;
4468
4469#define ADDRCONF_CTL_PATH_DEV   3
4470
4471        struct ctl_path addrconf_ctl_path[] = {
4472                { .procname = "net", },
4473                { .procname = "ipv6", },
4474                { .procname = "conf", },
4475                { /* to be set */ },
4476                { },
4477        };
4478
4479
4480        t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4481        if (t == NULL)
4482                goto out;
4483
4484        for (i = 0; t->addrconf_vars[i].data; i++) {
4485                t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4486                t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4487                t->addrconf_vars[i].extra2 = net;
4488        }
4489
4490        /*
4491         * Make a copy of dev_name, because '.procname' is regarded as const
4492         * by sysctl and we wouldn't want anyone to change it under our feet
4493         * (see SIOCSIFNAME).