git.oblomov.eu Git - linux-2.6/blob - net/ipv6/addrconf.c

   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  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.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 <asm/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 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 102
 103 #ifdef CONFIG_SYSCTL
 104 static void addrconf_sysctl_register(struct inet6_dev *idev);
 105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 106 #else
 107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 108 {
 109 }
 110
 111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 112 {
 113 }
 114 #endif
 115
 116 #ifdef CONFIG_IPV6_PRIVACY
 117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 119 static void ipv6_regen_rndid(unsigned long data);
 120
 121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 122 #endif
 123
 124 static int ipv6_count_addresses(struct inet6_dev *idev);
 125
 126 /*
 127  *      Configured unicast address hash table
 128  */
 129 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 130 static DEFINE_RWLOCK(addrconf_hash_lock);
 131
 132 static void addrconf_verify(unsigned long);
 133
 134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 135 static DEFINE_SPINLOCK(addrconf_verify_lock);
 136
 137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 139
 140 static int addrconf_ifdown(struct net_device *dev, int how);
 141
 142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 143 static void addrconf_dad_timer(unsigned long data);
 144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 145 static void addrconf_dad_run(struct inet6_dev *idev);
 146 static void addrconf_rs_timer(unsigned long data);
 147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 149
 150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 151                                 struct prefix_info *pinfo);
 152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 153                               struct net_device *dev);
 154
 155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 156
 157 struct ipv6_devconf ipv6_devconf __read_mostly = {
 158         .forwarding             = 0,
 159         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 160         .mtu6                   = IPV6_MIN_MTU,
 161         .accept_ra              = 1,
 162         .accept_redirects       = 1,
 163         .autoconf               = 1,
 164         .force_mld_version      = 0,
 165         .dad_transmits          = 1,
 166         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 167         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 168         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 169 #ifdef CONFIG_IPV6_PRIVACY
 170         .use_tempaddr           = 0,
 171         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 172         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 173         .regen_max_retry        = REGEN_MAX_RETRY,
 174         .max_desync_factor      = MAX_DESYNC_FACTOR,
 175 #endif
 176         .max_addresses          = IPV6_MAX_ADDRESSES,
 177         .accept_ra_defrtr       = 1,
 178         .accept_ra_pinfo        = 1,
 179 #ifdef CONFIG_IPV6_ROUTER_PREF
 180         .accept_ra_rtr_pref     = 1,
 181         .rtr_probe_interval     = 60 * HZ,
 182 #ifdef CONFIG_IPV6_ROUTE_INFO
 183         .accept_ra_rt_info_max_plen = 0,
 184 #endif
 185 #endif
 186         .proxy_ndp              = 0,
 187         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 188 };
 189
 190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 191         .forwarding             = 0,
 192         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 193         .mtu6                   = IPV6_MIN_MTU,
 194         .accept_ra              = 1,
 195         .accept_redirects       = 1,
 196         .autoconf               = 1,
 197         .dad_transmits          = 1,
 198         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 199         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 200         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 201 #ifdef CONFIG_IPV6_PRIVACY
 202         .use_tempaddr           = 0,
 203         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 204         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 205         .regen_max_retry        = REGEN_MAX_RETRY,
 206         .max_desync_factor      = MAX_DESYNC_FACTOR,
 207 #endif
 208         .max_addresses          = IPV6_MAX_ADDRESSES,
 209         .accept_ra_defrtr       = 1,
 210         .accept_ra_pinfo        = 1,
 211 #ifdef CONFIG_IPV6_ROUTER_PREF
 212         .accept_ra_rtr_pref     = 1,
 213         .rtr_probe_interval     = 60 * HZ,
 214 #ifdef CONFIG_IPV6_ROUTE_INFO
 215         .accept_ra_rt_info_max_plen = 0,
 216 #endif
 217 #endif
 218         .proxy_ndp              = 0,
 219         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 220 };
 221
 222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 225
 226 /* Check if a valid qdisc is available */
 227 static inline int addrconf_qdisc_ok(struct net_device *dev)
 228 {
 229         return (dev->qdisc != &noop_qdisc);
 230 }
 231
 232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 233 {
 234         if (del_timer(&ifp->timer))
 235                 __in6_ifa_put(ifp);
 236 }
 237
 238 enum addrconf_timer_t
 239 {
 240         AC_NONE,
 241         AC_DAD,
 242         AC_RS,
 243 };
 244
 245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 246                                enum addrconf_timer_t what,
 247                                unsigned long when)
 248 {
 249         if (!del_timer(&ifp->timer))
 250                 in6_ifa_hold(ifp);
 251
 252         switch (what) {
 253         case AC_DAD:
 254                 ifp->timer.function = addrconf_dad_timer;
 255                 break;
 256         case AC_RS:
 257                 ifp->timer.function = addrconf_rs_timer;
 258                 break;
 259         default:;
 260         }
 261         ifp->timer.expires = jiffies + when;
 262         add_timer(&ifp->timer);
 263 }
 264
 265 static int snmp6_alloc_dev(struct inet6_dev *idev)
 266 {
 267         if (snmp_mib_init((void **)idev->stats.ipv6,
 268                           sizeof(struct ipstats_mib)) < 0)
 269                 goto err_ip;
 270         if (snmp_mib_init((void **)idev->stats.icmpv6,
 271                           sizeof(struct icmpv6_mib)) < 0)
 272                 goto err_icmp;
 273         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
 274                           sizeof(struct icmpv6msg_mib)) < 0)
 275                 goto err_icmpmsg;
 276
 277         return 0;
 278
 279 err_icmpmsg:
 280         snmp_mib_free((void **)idev->stats.icmpv6);
 281 err_icmp:
 282         snmp_mib_free((void **)idev->stats.ipv6);
 283 err_ip:
 284         return -ENOMEM;
 285 }
 286
 287 static void snmp6_free_dev(struct inet6_dev *idev)
 288 {
 289         snmp_mib_free((void **)idev->stats.icmpv6msg);
 290         snmp_mib_free((void **)idev->stats.icmpv6);
 291         snmp_mib_free((void **)idev->stats.ipv6);
 292 }
 293
 294 /* Nobody refers to this device, we may destroy it. */
 295
 296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 297 {
 298         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 299         kfree(idev);
 300 }
 301
 302 void in6_dev_finish_destroy(struct inet6_dev *idev)
 303 {
 304         struct net_device *dev = idev->dev;
 305         BUG_TRAP(idev->addr_list==NULL);
 306         BUG_TRAP(idev->mc_list==NULL);
 307 #ifdef NET_REFCNT_DEBUG
 308         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 309 #endif
 310         dev_put(dev);
 311         if (!idev->dead) {
 312                 printk("Freeing alive inet6 device %p\n", idev);
 313                 return;
 314         }
 315         snmp6_free_dev(idev);
 316         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 317 }
 318
 319 EXPORT_SYMBOL(in6_dev_finish_destroy);
 320
 321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 322 {
 323         struct inet6_dev *ndev;
 324         struct in6_addr maddr;
 325
 326         ASSERT_RTNL();
 327
 328         if (dev->mtu < IPV6_MIN_MTU)
 329                 return NULL;
 330
 331         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 332
 333         if (ndev == NULL)
 334                 return NULL;
 335
 336         rwlock_init(&ndev->lock);
 337         ndev->dev = dev;
 338         memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
 339         ndev->cnf.mtu6 = dev->mtu;
 340         ndev->cnf.sysctl = NULL;
 341         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 342         if (ndev->nd_parms == NULL) {
 343                 kfree(ndev);
 344                 return NULL;
 345         }
 346         /* We refer to the device */
 347         dev_hold(dev);
 348
 349         if (snmp6_alloc_dev(ndev) < 0) {
 350                 ADBG((KERN_WARNING
 351                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 352                         __FUNCTION__, dev->name));
 353                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 354                 ndev->dead = 1;
 355                 in6_dev_finish_destroy(ndev);
 356                 return NULL;
 357         }
 358
 359         if (snmp6_register_dev(ndev) < 0) {
 360                 ADBG((KERN_WARNING
 361                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 362                         __FUNCTION__, dev->name));
 363                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 364                 ndev->dead = 1;
 365                 in6_dev_finish_destroy(ndev);
 366                 return NULL;
 367         }
 368
 369         /* One reference from device.  We must do this before
 370          * we invoke __ipv6_regen_rndid().
 371          */
 372         in6_dev_hold(ndev);
 373
 374 #ifdef CONFIG_IPV6_PRIVACY
 375         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 376         if ((dev->flags&IFF_LOOPBACK) ||
 377             dev->type == ARPHRD_TUNNEL ||
 378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 379             dev->type == ARPHRD_SIT ||
 380 #endif
 381             dev->type == ARPHRD_NONE) {
 382                 printk(KERN_INFO
 383                        "%s: Disabled Privacy Extensions\n",
 384                        dev->name);
 385                 ndev->cnf.use_tempaddr = -1;
 386
 387                 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 388                         printk(KERN_INFO
 389                                "%s: Disabled Multicast RS\n",
 390                                dev->name);
 391                         ndev->cnf.rtr_solicits = 0;
 392                 }
 393         } else {
 394                 in6_dev_hold(ndev);
 395                 ipv6_regen_rndid((unsigned long) ndev);
 396         }
 397 #endif
 398
 399         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 400                 ndev->if_flags |= IF_READY;
 401
 402         ipv6_mc_init_dev(ndev);
 403         ndev->tstamp = jiffies;
 404         addrconf_sysctl_register(ndev);
 405         /* protected by rtnl_lock */
 406         rcu_assign_pointer(dev->ip6_ptr, ndev);
 407
 408         /* Join all-node multicast group */
 409         ipv6_addr_all_nodes(&maddr);
 410         ipv6_dev_mc_inc(dev, &maddr);
 411
 412         return ndev;
 413 }
 414
 415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 416 {
 417         struct inet6_dev *idev;
 418
 419         ASSERT_RTNL();
 420
 421         if ((idev = __in6_dev_get(dev)) == NULL) {
 422                 if ((idev = ipv6_add_dev(dev)) == NULL)
 423                         return NULL;
 424         }
 425
 426         if (dev->flags&IFF_UP)
 427                 ipv6_mc_up(idev);
 428         return idev;
 429 }
 430
 431 #ifdef CONFIG_SYSCTL
 432 static void dev_forward_change(struct inet6_dev *idev)
 433 {
 434         struct net_device *dev;
 435         struct inet6_ifaddr *ifa;
 436         struct in6_addr addr;
 437
 438         if (!idev)
 439                 return;
 440         dev = idev->dev;
 441         if (dev && (dev->flags & IFF_MULTICAST)) {
 442                 ipv6_addr_all_routers(&addr);
 443
 444                 if (idev->cnf.forwarding)
 445                         ipv6_dev_mc_inc(dev, &addr);
 446                 else
 447                         ipv6_dev_mc_dec(dev, &addr);
 448         }
 449         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 450                 if (ifa->flags&IFA_F_TENTATIVE)
 451                         continue;
 452                 if (idev->cnf.forwarding)
 453                         addrconf_join_anycast(ifa);
 454                 else
 455                         addrconf_leave_anycast(ifa);
 456         }
 457 }
 458
 459
 460 static void addrconf_forward_change(struct net *net, __s32 newf)
 461 {
 462         struct net_device *dev;
 463         struct inet6_dev *idev;
 464
 465         read_lock(&dev_base_lock);
 466         for_each_netdev(net, dev) {
 467                 rcu_read_lock();
 468                 idev = __in6_dev_get(dev);
 469                 if (idev) {
 470                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 471                         idev->cnf.forwarding = newf;
 472                         if (changed)
 473                                 dev_forward_change(idev);
 474                 }
 475                 rcu_read_unlock();
 476         }
 477         read_unlock(&dev_base_lock);
 478 }
 479
 480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
 481 {
 482         struct net *net;
 483
 484         net = (struct net *)table->extra2;
 485         if (p == &net->ipv6.devconf_dflt->forwarding)
 486                 return;
 487
 488         if (p == &net->ipv6.devconf_all->forwarding) {
 489                 __s32 newf = net->ipv6.devconf_all->forwarding;
 490                 net->ipv6.devconf_dflt->forwarding = newf;
 491                 addrconf_forward_change(net, newf);
 492         } else if ((!*p) ^ (!old))
 493                 dev_forward_change((struct inet6_dev *)table->extra1);
 494
 495         if (*p)
 496                 rt6_purge_dflt_routers();
 497 }
 498 #endif
 499
 500 /* Nobody refers to this ifaddr, destroy it */
 501
 502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 503 {
 504         BUG_TRAP(ifp->if_next==NULL);
 505         BUG_TRAP(ifp->lst_next==NULL);
 506 #ifdef NET_REFCNT_DEBUG
 507         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 508 #endif
 509
 510         in6_dev_put(ifp->idev);
 511
 512         if (del_timer(&ifp->timer))
 513                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 514
 515         if (!ifp->dead) {
 516                 printk("Freeing alive inet6 address %p\n", ifp);
 517                 return;
 518         }
 519         dst_release(&ifp->rt->u.dst);
 520
 521         kfree(ifp);
 522 }
 523
 524 static void
 525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 526 {
 527         struct inet6_ifaddr *ifa, **ifap;
 528         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 529
 530         /*
 531          * Each device address list is sorted in order of scope -
 532          * global before linklocal.
 533          */
 534         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 535              ifap = &ifa->if_next) {
 536                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 537                         break;
 538         }
 539
 540         ifp->if_next = *ifap;
 541         *ifap = ifp;
 542 }
 543
 544 /* On success it returns ifp with increased reference count */
 545
 546 static struct inet6_ifaddr *
 547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 548               int scope, u32 flags)
 549 {
 550         struct inet6_ifaddr *ifa = NULL;
 551         struct rt6_info *rt;
 552         int hash;
 553         int err = 0;
 554
 555         rcu_read_lock_bh();
 556         if (idev->dead) {
 557                 err = -ENODEV;                  /*XXX*/
 558                 goto out2;
 559         }
 560
 561         write_lock(&addrconf_hash_lock);
 562
 563         /* Ignore adding duplicate addresses on an interface */
 564         if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
 565                 ADBG(("ipv6_add_addr: already assigned\n"));
 566                 err = -EEXIST;
 567                 goto out;
 568         }
 569
 570         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 571
 572         if (ifa == NULL) {
 573                 ADBG(("ipv6_add_addr: malloc failed\n"));
 574                 err = -ENOBUFS;
 575                 goto out;
 576         }
 577
 578         rt = addrconf_dst_alloc(idev, addr, 0);
 579         if (IS_ERR(rt)) {
 580                 err = PTR_ERR(rt);
 581                 goto out;
 582         }
 583
 584         ipv6_addr_copy(&ifa->addr, addr);
 585
 586         spin_lock_init(&ifa->lock);
 587         init_timer(&ifa->timer);
 588         ifa->timer.data = (unsigned long) ifa;
 589         ifa->scope = scope;
 590         ifa->prefix_len = pfxlen;
 591         ifa->flags = flags | IFA_F_TENTATIVE;
 592         ifa->cstamp = ifa->tstamp = jiffies;
 593
 594         ifa->rt = rt;
 595
 596         /*
 597          * part one of RFC 4429, section 3.3
 598          * We should not configure an address as
 599          * optimistic if we do not yet know the link
 600          * layer address of our nexhop router
 601          */
 602
 603         if (rt->rt6i_nexthop == NULL)
 604                 ifa->flags &= ~IFA_F_OPTIMISTIC;
 605
 606         ifa->idev = idev;
 607         in6_dev_hold(idev);
 608         /* For caller */
 609         in6_ifa_hold(ifa);
 610
 611         /* Add to big hash table */
 612         hash = ipv6_addr_hash(addr);
 613
 614         ifa->lst_next = inet6_addr_lst[hash];
 615         inet6_addr_lst[hash] = ifa;
 616         in6_ifa_hold(ifa);
 617         write_unlock(&addrconf_hash_lock);
 618
 619         write_lock(&idev->lock);
 620         /* Add to inet6_dev unicast addr list. */
 621         ipv6_link_dev_addr(idev, ifa);
 622
 623 #ifdef CONFIG_IPV6_PRIVACY
 624         if (ifa->flags&IFA_F_TEMPORARY) {
 625                 ifa->tmp_next = idev->tempaddr_list;
 626                 idev->tempaddr_list = ifa;
 627                 in6_ifa_hold(ifa);
 628         }
 629 #endif
 630
 631         in6_ifa_hold(ifa);
 632         write_unlock(&idev->lock);
 633 out2:
 634         rcu_read_unlock_bh();
 635
 636         if (likely(err == 0))
 637                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 638         else {
 639                 kfree(ifa);
 640                 ifa = ERR_PTR(err);
 641         }
 642
 643         return ifa;
 644 out:
 645         write_unlock(&addrconf_hash_lock);
 646         goto out2;
 647 }
 648
 649 /* This function wants to get referenced ifp and releases it before return */
 650
 651 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 652 {
 653         struct inet6_ifaddr *ifa, **ifap;
 654         struct inet6_dev *idev = ifp->idev;
 655         int hash;
 656         int deleted = 0, onlink = 0;
 657         unsigned long expires = jiffies;
 658
 659         hash = ipv6_addr_hash(&ifp->addr);
 660
 661         ifp->dead = 1;
 662
 663         write_lock_bh(&addrconf_hash_lock);
 664         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 665              ifap = &ifa->lst_next) {
 666                 if (ifa == ifp) {
 667                         *ifap = ifa->lst_next;
 668                         __in6_ifa_put(ifp);
 669                         ifa->lst_next = NULL;
 670                         break;
 671                 }
 672         }
 673         write_unlock_bh(&addrconf_hash_lock);
 674
 675         write_lock_bh(&idev->lock);
 676 #ifdef CONFIG_IPV6_PRIVACY
 677         if (ifp->flags&IFA_F_TEMPORARY) {
 678                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 679                      ifap = &ifa->tmp_next) {
 680                         if (ifa == ifp) {
 681                                 *ifap = ifa->tmp_next;
 682                                 if (ifp->ifpub) {
 683                                         in6_ifa_put(ifp->ifpub);
 684                                         ifp->ifpub = NULL;
 685                                 }
 686                                 __in6_ifa_put(ifp);
 687                                 ifa->tmp_next = NULL;
 688                                 break;
 689                         }
 690                 }
 691         }
 692 #endif
 693
 694         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 695                 if (ifa == ifp) {
 696                         *ifap = ifa->if_next;
 697                         __in6_ifa_put(ifp);
 698                         ifa->if_next = NULL;
 699                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 700                                 break;
 701                         deleted = 1;
 702                         continue;
 703                 } else if (ifp->flags & IFA_F_PERMANENT) {
 704                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 705                                               ifp->prefix_len)) {
 706                                 if (ifa->flags & IFA_F_PERMANENT) {
 707                                         onlink = 1;
 708                                         if (deleted)
 709                                                 break;
 710                                 } else {
 711                                         unsigned long lifetime;
 712
 713                                         if (!onlink)
 714                                                 onlink = -1;
 715
 716                                         spin_lock(&ifa->lock);
 717                                         lifetime = min_t(unsigned long,
 718                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 719                                         if (time_before(expires,
 720                                                         ifa->tstamp + lifetime * HZ))
 721                                                 expires = ifa->tstamp + lifetime * HZ;
 722                                         spin_unlock(&ifa->lock);
 723                                 }
 724                         }
 725                 }
 726                 ifap = &ifa->if_next;
 727         }
 728         write_unlock_bh(&idev->lock);
 729
 730         ipv6_ifa_notify(RTM_DELADDR, ifp);
 731
 732         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 733
 734         addrconf_del_timer(ifp);
 735
 736         /*
 737          * Purge or update corresponding prefix
 738          *
 739          * 1) we don't purge prefix here if address was not permanent.
 740          *    prefix is managed by its own lifetime.
 741          * 2) if there're no addresses, delete prefix.
 742          * 3) if there're still other permanent address(es),
 743          *    corresponding prefix is still permanent.
 744          * 4) otherwise, update prefix lifetime to the
 745          *    longest valid lifetime among the corresponding
 746          *    addresses on the device.
 747          *    Note: subsequent RA will update lifetime.
 748          *
 749          * --yoshfuji
 750          */
 751         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 752                 struct in6_addr prefix;
 753                 struct rt6_info *rt;
 754
 755                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 756                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 757
 758                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 759                         if (onlink == 0) {
 760                                 ip6_del_rt(rt);
 761                                 rt = NULL;
 762                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 763                                 rt->rt6i_expires = expires;
 764                                 rt->rt6i_flags |= RTF_EXPIRES;
 765                         }
 766                 }
 767                 dst_release(&rt->u.dst);
 768         }
 769
 770         in6_ifa_put(ifp);
 771 }
 772
 773 #ifdef CONFIG_IPV6_PRIVACY
 774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 775 {
 776         struct inet6_dev *idev = ifp->idev;
 777         struct in6_addr addr, *tmpaddr;
 778         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 779         unsigned long regen_advance;
 780         int tmp_plen;
 781         int ret = 0;
 782         int max_addresses;
 783         u32 addr_flags;
 784
 785         write_lock(&idev->lock);
 786         if (ift) {
 787                 spin_lock_bh(&ift->lock);
 788                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 789                 spin_unlock_bh(&ift->lock);
 790                 tmpaddr = &addr;
 791         } else {
 792                 tmpaddr = NULL;
 793         }
 794 retry:
 795         in6_dev_hold(idev);
 796         if (idev->cnf.use_tempaddr <= 0) {
 797                 write_unlock(&idev->lock);
 798                 printk(KERN_INFO
 799                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 800                 in6_dev_put(idev);
 801                 ret = -1;
 802                 goto out;
 803         }
 804         spin_lock_bh(&ifp->lock);
 805         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 806                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 807                 spin_unlock_bh(&ifp->lock);
 808                 write_unlock(&idev->lock);
 809                 printk(KERN_WARNING
 810                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 811                 in6_dev_put(idev);
 812                 ret = -1;
 813                 goto out;
 814         }
 815         in6_ifa_hold(ifp);
 816         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 817         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 818                 spin_unlock_bh(&ifp->lock);
 819                 write_unlock(&idev->lock);
 820                 printk(KERN_WARNING
 821                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 822                 in6_ifa_put(ifp);
 823                 in6_dev_put(idev);
 824                 ret = -1;
 825                 goto out;
 826         }
 827         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 828         tmp_valid_lft = min_t(__u32,
 829                               ifp->valid_lft,
 830                               idev->cnf.temp_valid_lft);
 831         tmp_prefered_lft = min_t(__u32,
 832                                  ifp->prefered_lft,
 833                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 834         tmp_plen = ifp->prefix_len;
 835         max_addresses = idev->cnf.max_addresses;
 836         tmp_cstamp = ifp->cstamp;
 837         tmp_tstamp = ifp->tstamp;
 838         spin_unlock_bh(&ifp->lock);
 839
 840         regen_advance = idev->cnf.regen_max_retry *
 841                         idev->cnf.dad_transmits *
 842                         idev->nd_parms->retrans_time / HZ;
 843         write_unlock(&idev->lock);
 844
 845         /* A temporary address is created only if this calculated Preferred
 846          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 847          * an implementation must not create a temporary address with a zero
 848          * Preferred Lifetime.
 849          */
 850         if (tmp_prefered_lft <= regen_advance) {
 851                 in6_ifa_put(ifp);
 852                 in6_dev_put(idev);
 853                 ret = -1;
 854                 goto out;
 855         }
 856
 857         addr_flags = IFA_F_TEMPORARY;
 858         /* set in addrconf_prefix_rcv() */
 859         if (ifp->flags & IFA_F_OPTIMISTIC)
 860                 addr_flags |= IFA_F_OPTIMISTIC;
 861
 862         ift = !max_addresses ||
 863               ipv6_count_addresses(idev) < max_addresses ?
 864                 ipv6_add_addr(idev, &addr, tmp_plen,
 865                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 866                               addr_flags) : NULL;
 867         if (!ift || IS_ERR(ift)) {
 868                 in6_ifa_put(ifp);
 869                 in6_dev_put(idev);
 870                 printk(KERN_INFO
 871                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 872                 tmpaddr = &addr;
 873                 write_lock(&idev->lock);
 874                 goto retry;
 875         }
 876
 877         spin_lock_bh(&ift->lock);
 878         ift->ifpub = ifp;
 879         ift->valid_lft = tmp_valid_lft;
 880         ift->prefered_lft = tmp_prefered_lft;
 881         ift->cstamp = tmp_cstamp;
 882         ift->tstamp = tmp_tstamp;
 883         spin_unlock_bh(&ift->lock);
 884
 885         addrconf_dad_start(ift, 0);
 886         in6_ifa_put(ift);
 887         in6_dev_put(idev);
 888 out:
 889         return ret;
 890 }
 891 #endif
 892
 893 /*
 894  *      Choose an appropriate source address (RFC3484)
 895  */
 896 struct ipv6_saddr_score {
 897         int             addr_type;
 898         unsigned int    attrs;
 899         int             matchlen;
 900         int             scope;
 901         unsigned int    rule;
 902 };
 903
 904 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 905 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 906 #define IPV6_SADDR_SCORE_HOA            0x0008
 907 #define IPV6_SADDR_SCORE_OIF            0x0010
 908 #define IPV6_SADDR_SCORE_LABEL          0x0020
 909 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 910
 911 static inline int ipv6_saddr_preferred(int type)
 912 {
 913         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 914                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 915                 return 1;
 916         return 0;
 917 }
 918
 919 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 920                        struct in6_addr *daddr, struct in6_addr *saddr)
 921 {
 922         struct ipv6_saddr_score hiscore;
 923         struct inet6_ifaddr *ifa_result = NULL;
 924         int daddr_type = __ipv6_addr_type(daddr);
 925         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 926         int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
 927         u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
 928         struct net_device *dev;
 929
 930         memset(&hiscore, 0, sizeof(hiscore));
 931
 932         read_lock(&dev_base_lock);
 933         rcu_read_lock();
 934
 935         for_each_netdev(&init_net, dev) {
 936                 struct inet6_dev *idev;
 937                 struct inet6_ifaddr *ifa;
 938
 939                 /* Rule 0: Candidate Source Address (section 4)
 940                  *  - multicast and link-local destination address,
 941                  *    the set of candidate source address MUST only
 942                  *    include addresses assigned to interfaces
 943                  *    belonging to the same link as the outgoing
 944                  *    interface.
 945                  * (- For site-local destination addresses, the
 946                  *    set of candidate source addresses MUST only
 947                  *    include addresses assigned to interfaces
 948                  *    belonging to the same site as the outgoing
 949                  *    interface.)
 950                  */
 951                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 952                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 953                     daddr_dev && dev != daddr_dev)
 954                         continue;
 955
 956                 idev = __in6_dev_get(dev);
 957                 if (!idev)
 958                         continue;
 959
 960                 read_lock_bh(&idev->lock);
 961                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 962                         struct ipv6_saddr_score score;
 963
 964                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 965
 966                         /* Rule 0:
 967                          * - Tentative Address (RFC2462 section 5.4)
 968                          *  - A tentative address is not considered
 969                          *    "assigned to an interface" in the traditional
 970                          *    sense, unless it is also flagged as optimistic.
 971                          * - Candidate Source Address (section 4)
 972                          *  - In any case, anycast addresses, multicast
 973                          *    addresses, and the unspecified address MUST
 974                          *    NOT be included in a candidate set.
 975                          */
 976                         if ((ifa->flags & IFA_F_TENTATIVE) &&
 977                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
 978                                 continue;
 979                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 980                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 981                                 LIMIT_NETDEBUG(KERN_DEBUG
 982                                                "ADDRCONF: unspecified / multicast address "
 983                                                "assigned as unicast address on %s",
 984                                                dev->name);
 985                                 continue;
 986                         }
 987
 988                         score.attrs = 0;
 989                         score.matchlen = 0;
 990                         score.scope = 0;
 991                         score.rule = 0;
 992
 993                         if (ifa_result == NULL) {
 994                                 /* record it if the first available entry */
 995                                 goto record_it;
 996                         }
 997
 998                         /* Rule 1: Prefer same address */
 999                         if (hiscore.rule < 1) {
1000                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
1001                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
1002                                 hiscore.rule++;
1003                         }
1004                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
1005                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
1006                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1007                                         score.rule = 1;
1008                                         goto record_it;
1009                                 }
1010                         } else {
1011                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1012                                         continue;
1013                         }
1014
1015                         /* Rule 2: Prefer appropriate scope */
1016                         if (hiscore.rule < 2) {
1017                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1018                                 hiscore.rule++;
1019                         }
1020                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1021                         if (hiscore.scope < score.scope) {
1022                                 if (hiscore.scope < daddr_scope) {
1023                                         score.rule = 2;
1024                                         goto record_it;
1025                                 } else
1026                                         continue;
1027                         } else if (score.scope < hiscore.scope) {
1028                                 if (score.scope < daddr_scope)
1029                                         break; /* addresses sorted by scope */
1030                                 else {
1031                                         score.rule = 2;
1032                                         goto record_it;
1033                                 }
1034                         }
1035
1036                         /* Rule 3: Avoid deprecated and optimistic addresses */
1037                         if (hiscore.rule < 3) {
1038                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1039                                    (((ifa_result->flags &
1040                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1041                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1042                                 hiscore.rule++;
1043                         }
1044                         if (ipv6_saddr_preferred(score.addr_type) ||
1045                            (((ifa->flags &
1046                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1047                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1048                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1049                                         score.rule = 3;
1050                                         goto record_it;
1051                                 }
1052                         } else {
1053                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1054                                         continue;
1055                         }
1056
1057                         /* Rule 4: Prefer home address */
1058 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1059                         if (hiscore.rule < 4) {
1060                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1061                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1062                                 hiscore.rule++;
1063                         }
1064                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1065                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1066                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1067                                         score.rule = 4;
1068                                         goto record_it;
1069                                 }
1070                         } else {
1071                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1072                                         continue;
1073                         }
1074 #else
1075                         if (hiscore.rule < 4)
1076                                 hiscore.rule++;
1077 #endif
1078
1079                         /* Rule 5: Prefer outgoing interface */
1080                         if (hiscore.rule < 5) {
1081                                 if (daddr_dev == NULL ||
1082                                     daddr_dev == ifa_result->idev->dev)
1083                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1084                                 hiscore.rule++;
1085                         }
1086                         if (daddr_dev == NULL ||
1087                             daddr_dev == ifa->idev->dev) {
1088                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1089                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1090                                         score.rule = 5;
1091                                         goto record_it;
1092                                 }
1093                         } else {
1094                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1095                                         continue;
1096                         }
1097
1098                         /* Rule 6: Prefer matching label */
1099                         if (hiscore.rule < 6) {
1100                                 if (ipv6_addr_label(&ifa_result->addr,
1101                                                     hiscore.addr_type,
1102                                                     ifa_result->idev->dev->ifindex) == daddr_label)
1103                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1104                                 hiscore.rule++;
1105                         }
1106                         if (ipv6_addr_label(&ifa->addr,
1107                                             score.addr_type,
1108                                             ifa->idev->dev->ifindex) == daddr_label) {
1109                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1110                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1111                                         score.rule = 6;
1112                                         goto record_it;
1113                                 }
1114                         } else {
1115                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1116                                         continue;
1117                         }
1118
1119 #ifdef CONFIG_IPV6_PRIVACY
1120                         /* Rule 7: Prefer public address
1121                          * Note: prefer temprary address if use_tempaddr >= 2
1122                          */
1123                         if (hiscore.rule < 7) {
1124                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1125                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1126                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1127                                 hiscore.rule++;
1128                         }
1129                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1130                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1131                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1132                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1133                                         score.rule = 7;
1134                                         goto record_it;
1135                                 }
1136                         } else {
1137                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1138                                         continue;
1139                         }
1140 #else
1141                         if (hiscore.rule < 7)
1142                                 hiscore.rule++;
1143 #endif
1144                         /* Rule 8: Use longest matching prefix */
1145                         if (hiscore.rule < 8) {
1146                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1147                                 hiscore.rule++;
1148                         }
1149                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1150                         if (score.matchlen > hiscore.matchlen) {
1151                                 score.rule = 8;
1152                                 goto record_it;
1153                         }
1154 #if 0
1155                         else if (score.matchlen < hiscore.matchlen)
1156                                 continue;
1157 #endif
1158
1159                         /* Final Rule: choose first available one */
1160                         continue;
1161 record_it:
1162                         if (ifa_result)
1163                                 in6_ifa_put(ifa_result);
1164                         in6_ifa_hold(ifa);
1165                         ifa_result = ifa;
1166                         hiscore = score;
1167                 }
1168                 read_unlock_bh(&idev->lock);
1169         }
1170         rcu_read_unlock();
1171         read_unlock(&dev_base_lock);
1172
1173         if (!ifa_result)
1174                 return -EADDRNOTAVAIL;
1175
1176         ipv6_addr_copy(saddr, &ifa_result->addr);
1177         in6_ifa_put(ifa_result);
1178         return 0;
1179 }
1180
1181
1182 int ipv6_get_saddr(struct dst_entry *dst,
1183                    struct in6_addr *daddr, struct in6_addr *saddr)
1184 {
1185         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1186 }
1187
1188 EXPORT_SYMBOL(ipv6_get_saddr);
1189
1190 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1191                     unsigned char banned_flags)
1192 {
1193         struct inet6_dev *idev;
1194         int err = -EADDRNOTAVAIL;
1195
1196         rcu_read_lock();
1197         if ((idev = __in6_dev_get(dev)) != NULL) {
1198                 struct inet6_ifaddr *ifp;
1199
1200                 read_lock_bh(&idev->lock);
1201                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1202                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1203                                 ipv6_addr_copy(addr, &ifp->addr);
1204                                 err = 0;
1205                                 break;
1206                         }
1207                 }
1208                 read_unlock_bh(&idev->lock);
1209         }
1210         rcu_read_unlock();
1211         return err;
1212 }
1213
1214 static int ipv6_count_addresses(struct inet6_dev *idev)
1215 {
1216         int cnt = 0;
1217         struct inet6_ifaddr *ifp;
1218
1219         read_lock_bh(&idev->lock);
1220         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1221                 cnt++;
1222         read_unlock_bh(&idev->lock);
1223         return cnt;
1224 }
1225
1226 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1227                   struct net_device *dev, int strict)
1228 {
1229         struct inet6_ifaddr * ifp;
1230         u8 hash = ipv6_addr_hash(addr);
1231
1232         read_lock_bh(&addrconf_hash_lock);
1233         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1234                 if (ifp->idev->dev->nd_net != net)
1235                         continue;
1236                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1237                     !(ifp->flags&IFA_F_TENTATIVE)) {
1238                         if (dev == NULL || ifp->idev->dev == dev ||
1239                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1240                                 break;
1241                 }
1242         }
1243         read_unlock_bh(&addrconf_hash_lock);
1244         return ifp != NULL;
1245 }
1246 EXPORT_SYMBOL(ipv6_chk_addr);
1247
1248 static
1249 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1250                        struct net_device *dev)
1251 {
1252         struct inet6_ifaddr * ifp;
1253         u8 hash = ipv6_addr_hash(addr);
1254
1255         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1256                 if (ifp->idev->dev->nd_net != net)
1257                         continue;
1258                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1259                         if (dev == NULL || ifp->idev->dev == dev)
1260                                 break;
1261                 }
1262         }
1263         return ifp != NULL;
1264 }
1265
1266 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1267                                      struct net_device *dev, int strict)
1268 {
1269         struct inet6_ifaddr * ifp;
1270         u8 hash = ipv6_addr_hash(addr);
1271
1272         read_lock_bh(&addrconf_hash_lock);
1273         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1274                 if (ifp->idev->dev->nd_net != net)
1275                         continue;
1276                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1277                         if (dev == NULL || ifp->idev->dev == dev ||
1278                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1279                                 in6_ifa_hold(ifp);
1280                                 break;
1281                         }
1282                 }
1283         }
1284         read_unlock_bh(&addrconf_hash_lock);
1285
1286         return ifp;
1287 }
1288
1289 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1290 {
1291         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1292         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1293         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1294         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1295         int sk_ipv6only = ipv6_only_sock(sk);
1296         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1297         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1298         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1299
1300         if (!sk2_rcv_saddr && !sk_ipv6only)
1301                 return 1;
1302
1303         if (addr_type2 == IPV6_ADDR_ANY &&
1304             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1305                 return 1;
1306
1307         if (addr_type == IPV6_ADDR_ANY &&
1308             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1309                 return 1;
1310
1311         if (sk2_rcv_saddr6 &&
1312             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1313                 return 1;
1314
1315         if (addr_type == IPV6_ADDR_MAPPED &&
1316             !sk2_ipv6only &&
1317             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1318                 return 1;
1319
1320         return 0;
1321 }
1322
1323 /* Gets referenced address, destroys ifaddr */
1324
1325 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1326 {
1327         if (ifp->flags&IFA_F_PERMANENT) {
1328                 spin_lock_bh(&ifp->lock);
1329                 addrconf_del_timer(ifp);
1330                 ifp->flags |= IFA_F_TENTATIVE;
1331                 spin_unlock_bh(&ifp->lock);
1332                 in6_ifa_put(ifp);
1333 #ifdef CONFIG_IPV6_PRIVACY
1334         } else if (ifp->flags&IFA_F_TEMPORARY) {
1335                 struct inet6_ifaddr *ifpub;
1336                 spin_lock_bh(&ifp->lock);
1337                 ifpub = ifp->ifpub;
1338                 if (ifpub) {
1339                         in6_ifa_hold(ifpub);
1340                         spin_unlock_bh(&ifp->lock);
1341                         ipv6_create_tempaddr(ifpub, ifp);
1342                         in6_ifa_put(ifpub);
1343                 } else {
1344                         spin_unlock_bh(&ifp->lock);
1345                 }
1346                 ipv6_del_addr(ifp);
1347 #endif
1348         } else
1349                 ipv6_del_addr(ifp);
1350 }
1351
1352 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1353 {
1354         if (net_ratelimit())
1355                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1356         addrconf_dad_stop(ifp);
1357 }
1358
1359 /* Join to solicited addr multicast group. */
1360
1361 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1362 {
1363         struct in6_addr maddr;
1364
1365         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1366                 return;
1367
1368         addrconf_addr_solict_mult(addr, &maddr);
1369         ipv6_dev_mc_inc(dev, &maddr);
1370 }
1371
1372 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1373 {
1374         struct in6_addr maddr;
1375
1376         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1377                 return;
1378
1379         addrconf_addr_solict_mult(addr, &maddr);
1380         __ipv6_dev_mc_dec(idev, &maddr);
1381 }
1382
1383 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1384 {
1385         struct in6_addr addr;
1386         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1387         if (ipv6_addr_any(&addr))
1388                 return;
1389         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1390 }
1391
1392 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1393 {
1394         struct in6_addr addr;
1395         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1396         if (ipv6_addr_any(&addr))
1397                 return;
1398         __ipv6_dev_ac_dec(ifp->idev, &addr);
1399 }
1400
1401 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1402 {
1403         if (dev->addr_len != ETH_ALEN)
1404                 return -1;
1405         memcpy(eui, dev->dev_addr, 3);
1406         memcpy(eui + 5, dev->dev_addr + 3, 3);
1407
1408         /*
1409          * The zSeries OSA network cards can be shared among various
1410          * OS instances, but the OSA cards have only one MAC address.
1411          * This leads to duplicate address conflicts in conjunction
1412          * with IPv6 if more than one instance uses the same card.
1413          *
1414          * The driver for these cards can deliver a unique 16-bit
1415          * identifier for each instance sharing the same card.  It is
1416          * placed instead of 0xFFFE in the interface identifier.  The
1417          * "u" bit of the interface identifier is not inverted in this
1418          * case.  Hence the resulting interface identifier has local
1419          * scope according to RFC2373.
1420          */
1421         if (dev->dev_id) {
1422                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1423                 eui[4] = dev->dev_id & 0xFF;
1424         } else {
1425                 eui[3] = 0xFF;
1426                 eui[4] = 0xFE;
1427                 eui[0] ^= 2;
1428         }
1429         return 0;
1430 }
1431
1432 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1433 {
1434         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1435         if (dev->addr_len != ARCNET_ALEN)
1436                 return -1;
1437         memset(eui, 0, 7);
1438         eui[7] = *(u8*)dev->dev_addr;
1439         return 0;
1440 }
1441
1442 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1443 {
1444         if (dev->addr_len != INFINIBAND_ALEN)
1445                 return -1;
1446         memcpy(eui, dev->dev_addr + 12, 8);
1447         eui[0] |= 2;
1448         return 0;
1449 }
1450
1451 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1452 {
1453         switch (dev->type) {
1454         case ARPHRD_ETHER:
1455         case ARPHRD_FDDI:
1456         case ARPHRD_IEEE802_TR:
1457                 return addrconf_ifid_eui48(eui, dev);
1458         case ARPHRD_ARCNET:
1459                 return addrconf_ifid_arcnet(eui, dev);
1460         case ARPHRD_INFINIBAND:
1461                 return addrconf_ifid_infiniband(eui, dev);
1462         case ARPHRD_SIT:
1463                 if (dev->priv_flags & IFF_ISATAP)
1464                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1465         }
1466         return -1;
1467 }
1468
1469 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1470 {
1471         int err = -1;
1472         struct inet6_ifaddr *ifp;
1473
1474         read_lock_bh(&idev->lock);
1475         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1476                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1477                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1478                         err = 0;
1479                         break;
1480                 }
1481         }
1482         read_unlock_bh(&idev->lock);
1483         return err;
1484 }
1485
1486 #ifdef CONFIG_IPV6_PRIVACY
1487 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1488 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1489 {
1490 regen:
1491         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1492         idev->rndid[0] &= ~0x02;
1493
1494         /*
1495          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1496          * check if generated address is not inappropriate
1497          *
1498          *  - Reserved subnet anycast (RFC 2526)
1499          *      11111101 11....11 1xxxxxxx
1500          *  - ISATAP (RFC4214) 6.1
1501          *      00-00-5E-FE-xx-xx-xx-xx
1502          *  - value 0
1503          *  - XXX: already assigned to an address on the device
1504          */
1505         if (idev->rndid[0] == 0xfd &&
1506             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1507             (idev->rndid[7]&0x80))
1508                 goto regen;
1509         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1510                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1511                         goto regen;
1512                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1513                         goto regen;
1514         }
1515
1516         return 0;
1517 }
1518
1519 static void ipv6_regen_rndid(unsigned long data)
1520 {
1521         struct inet6_dev *idev = (struct inet6_dev *) data;
1522         unsigned long expires;
1523
1524         rcu_read_lock_bh();
1525         write_lock_bh(&idev->lock);
1526
1527         if (idev->dead)
1528                 goto out;
1529
1530         if (__ipv6_regen_rndid(idev) < 0)
1531                 goto out;
1532
1533         expires = jiffies +
1534                 idev->cnf.temp_prefered_lft * HZ -
1535                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1536         if (time_before(expires, jiffies)) {
1537                 printk(KERN_WARNING
1538                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1539                         idev->dev->name);
1540                 goto out;
1541         }
1542
1543         if (!mod_timer(&idev->regen_timer, expires))
1544                 in6_dev_hold(idev);
1545
1546 out:
1547         write_unlock_bh(&idev->lock);
1548         rcu_read_unlock_bh();
1549         in6_dev_put(idev);
1550 }
1551
1552 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1553         int ret = 0;
1554
1555         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1556                 ret = __ipv6_regen_rndid(idev);
1557         return ret;
1558 }
1559 #endif
1560
1561 /*
1562  *      Add prefix route.
1563  */
1564
1565 static void
1566 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1567                       unsigned long expires, u32 flags)
1568 {
1569         struct fib6_config cfg = {
1570                 .fc_table = RT6_TABLE_PREFIX,
1571                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1572                 .fc_ifindex = dev->ifindex,
1573                 .fc_expires = expires,
1574                 .fc_dst_len = plen,
1575                 .fc_flags = RTF_UP | flags,
1576                 .fc_nlinfo.nl_net = &init_net,
1577         };
1578
1579         ipv6_addr_copy(&cfg.fc_dst, pfx);
1580
1581         /* Prevent useless cloning on PtP SIT.
1582            This thing is done here expecting that the whole
1583            class of non-broadcast devices need not cloning.
1584          */
1585 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1586         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1587                 cfg.fc_flags |= RTF_NONEXTHOP;
1588 #endif
1589
1590         ip6_route_add(&cfg);
1591 }
1592
1593 /* Create "default" multicast route to the interface */
1594
1595 static void addrconf_add_mroute(struct net_device *dev)
1596 {
1597         struct fib6_config cfg = {
1598                 .fc_table = RT6_TABLE_LOCAL,
1599                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1600                 .fc_ifindex = dev->ifindex,
1601                 .fc_dst_len = 8,
1602                 .fc_flags = RTF_UP,
1603                 .fc_nlinfo.nl_net = &init_net,
1604         };
1605
1606         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1607
1608         ip6_route_add(&cfg);
1609 }
1610
1611 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1612 static void sit_route_add(struct net_device *dev)
1613 {
1614         struct fib6_config cfg = {
1615                 .fc_table = RT6_TABLE_MAIN,
1616                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1617                 .fc_ifindex = dev->ifindex,
1618                 .fc_dst_len = 96,
1619                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1620                 .fc_nlinfo.nl_net = &init_net,
1621         };
1622
1623         /* prefix length - 96 bits "::d.d.d.d" */
1624         ip6_route_add(&cfg);
1625 }
1626 #endif
1627
1628 static void addrconf_add_lroute(struct net_device *dev)
1629 {
1630         struct in6_addr addr;
1631
1632         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1633         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1634 }
1635
1636 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1637 {
1638         struct inet6_dev *idev;
1639
1640         ASSERT_RTNL();
1641
1642         if ((idev = ipv6_find_idev(dev)) == NULL)
1643                 return NULL;
1644
1645         /* Add default multicast route */
1646         addrconf_add_mroute(dev);
1647
1648         /* Add link local route */
1649         addrconf_add_lroute(dev);
1650         return idev;
1651 }
1652
1653 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1654 {
1655         struct prefix_info *pinfo;
1656         __u32 valid_lft;
1657         __u32 prefered_lft;
1658         int addr_type;
1659         unsigned long rt_expires;
1660         struct inet6_dev *in6_dev;
1661
1662         pinfo = (struct prefix_info *) opt;
1663
1664         if (len < sizeof(struct prefix_info)) {
1665                 ADBG(("addrconf: prefix option too short\n"));
1666                 return;
1667         }
1668
1669         /*
1670          *      Validation checks ([ADDRCONF], page 19)
1671          */
1672
1673         addr_type = ipv6_addr_type(&pinfo->prefix);
1674
1675         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1676                 return;
1677
1678         valid_lft = ntohl(pinfo->valid);
1679         prefered_lft = ntohl(pinfo->prefered);
1680
1681         if (prefered_lft > valid_lft) {
1682                 if (net_ratelimit())
1683                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1684                 return;
1685         }
1686
1687         in6_dev = in6_dev_get(dev);
1688
1689         if (in6_dev == NULL) {
1690                 if (net_ratelimit())
1691                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1692                 return;
1693         }
1694
1695         /*
1696          *      Two things going on here:
1697          *      1) Add routes for on-link prefixes
1698          *      2) Configure prefixes with the auto flag set
1699          */
1700
1701         /* Avoid arithmetic overflow. Really, we could
1702            save rt_expires in seconds, likely valid_lft,
1703            but it would require division in fib gc, that it
1704            not good.
1705          */
1706         if (valid_lft >= 0x7FFFFFFF/HZ)
1707                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1708         else
1709                 rt_expires = valid_lft * HZ;
1710
1711         /*
1712          * We convert this (in jiffies) to clock_t later.
1713          * Avoid arithmetic overflow there as well.
1714          * Overflow can happen only if HZ < USER_HZ.
1715          */
1716         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1717                 rt_expires = 0x7FFFFFFF / USER_HZ;
1718
1719         if (pinfo->onlink) {
1720                 struct rt6_info *rt;
1721                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1722
1723                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1724                         if (rt->rt6i_flags&RTF_EXPIRES) {
1725                                 if (valid_lft == 0) {
1726                                         ip6_del_rt(rt);
1727                                         rt = NULL;
1728                                 } else {
1729                                         rt->rt6i_expires = jiffies + rt_expires;
1730                                 }
1731                         }
1732                 } else if (valid_lft) {
1733                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1734                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1735                 }
1736                 if (rt)
1737                         dst_release(&rt->u.dst);
1738         }
1739
1740         /* Try to figure out our local address for this prefix */
1741
1742         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1743                 struct inet6_ifaddr * ifp;
1744                 struct in6_addr addr;
1745                 int create = 0, update_lft = 0;
1746
1747                 if (pinfo->prefix_len == 64) {
1748                         memcpy(&addr, &pinfo->prefix, 8);
1749                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1750                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1751                                 in6_dev_put(in6_dev);
1752                                 return;
1753                         }
1754                         goto ok;
1755                 }
1756                 if (net_ratelimit())
1757                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1758                                pinfo->prefix_len);
1759                 in6_dev_put(in6_dev);
1760                 return;
1761
1762 ok:
1763
1764                 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1765
1766                 if (ifp == NULL && valid_lft) {
1767                         int max_addresses = in6_dev->cnf.max_addresses;
1768                         u32 addr_flags = 0;
1769
1770 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1771                         if (in6_dev->cnf.optimistic_dad &&
1772                             !ipv6_devconf.forwarding)
1773                                 addr_flags = IFA_F_OPTIMISTIC;
1774 #endif
1775
1776                         /* Do not allow to create too much of autoconfigured
1777                          * addresses; this would be too easy way to crash kernel.
1778                          */
1779                         if (!max_addresses ||
1780                             ipv6_count_addresses(in6_dev) < max_addresses)
1781                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1782                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1783                                                     addr_flags);
1784
1785                         if (!ifp || IS_ERR(ifp)) {
1786                                 in6_dev_put(in6_dev);
1787                                 return;
1788                         }
1789
1790                         update_lft = create = 1;
1791                         ifp->cstamp = jiffies;
1792                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1793                 }
1794
1795                 if (ifp) {
1796                         int flags;
1797                         unsigned long now;
1798 #ifdef CONFIG_IPV6_PRIVACY
1799                         struct inet6_ifaddr *ift;
1800 #endif
1801                         u32 stored_lft;
1802
1803                         /* update lifetime (RFC2462 5.5.3 e) */
1804                         spin_lock(&ifp->lock);
1805                         now = jiffies;
1806                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1807                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1808                         else
1809                                 stored_lft = 0;
1810                         if (!update_lft && stored_lft) {
1811                                 if (valid_lft > MIN_VALID_LIFETIME ||
1812                                     valid_lft > stored_lft)
1813                                         update_lft = 1;
1814                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1815                                         /* valid_lft <= stored_lft is always true */
1816                                         /* XXX: IPsec */
1817                                         update_lft = 0;
1818                                 } else {
1819                                         valid_lft = MIN_VALID_LIFETIME;
1820                                         if (valid_lft < prefered_lft)
1821                                                 prefered_lft = valid_lft;
1822                                         update_lft = 1;
1823                                 }
1824                         }
1825
1826                         if (update_lft) {
1827                                 ifp->valid_lft = valid_lft;
1828                                 ifp->prefered_lft = prefered_lft;
1829                                 ifp->tstamp = now;
1830                                 flags = ifp->flags;
1831                                 ifp->flags &= ~IFA_F_DEPRECATED;
1832                                 spin_unlock(&ifp->lock);
1833
1834                                 if (!(flags&IFA_F_TENTATIVE))
1835                                         ipv6_ifa_notify(0, ifp);
1836                         } else
1837                                 spin_unlock(&ifp->lock);
1838
1839 #ifdef CONFIG_IPV6_PRIVACY
1840                         read_lock_bh(&in6_dev->lock);
1841                         /* update all temporary addresses in the list */
1842                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1843                                 /*
1844                                  * When adjusting the lifetimes of an existing
1845                                  * temporary address, only lower the lifetimes.
1846                                  * Implementations must not increase the
1847                                  * lifetimes of an existing temporary address
1848                                  * when processing a Prefix Information Option.
1849                                  */
1850                                 if (ifp != ift->ifpub)
1851                                         continue;
1852
1853                                 spin_lock(&ift->lock);
1854                                 flags = ift->flags;
1855                                 if (ift->valid_lft > valid_lft &&
1856                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1857                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1858                                 if (ift->prefered_lft > prefered_lft &&
1859                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1860                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1861                                 spin_unlock(&ift->lock);
1862                                 if (!(flags&IFA_F_TENTATIVE))
1863                                         ipv6_ifa_notify(0, ift);
1864                         }
1865
1866                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1867                                 /*
1868                                  * When a new public address is created as described in [ADDRCONF],
1869                                  * also create a new temporary address.
1870                                  */
1871                                 read_unlock_bh(&in6_dev->lock);
1872                                 ipv6_create_tempaddr(ifp, NULL);
1873                         } else {
1874                                 read_unlock_bh(&in6_dev->lock);
1875                         }
1876 #endif
1877                         in6_ifa_put(ifp);
1878                         addrconf_verify(0);
1879                 }
1880         }
1881         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1882         in6_dev_put(in6_dev);
1883 }
1884
1885 /*
1886  *      Set destination address.
1887  *      Special case for SIT interfaces where we create a new "virtual"
1888  *      device.
1889  */
1890 int addrconf_set_dstaddr(void __user *arg)
1891 {
1892         struct in6_ifreq ireq;
1893         struct net_device *dev;
1894         int err = -EINVAL;
1895
1896         rtnl_lock();
1897
1898         err = -EFAULT;
1899         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1900                 goto err_exit;
1901
1902         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1903
1904         err = -ENODEV;
1905         if (dev == NULL)
1906                 goto err_exit;
1907
1908 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1909         if (dev->type == ARPHRD_SIT) {
1910                 struct ifreq ifr;
1911                 mm_segment_t    oldfs;
1912                 struct ip_tunnel_parm p;
1913
1914                 err = -EADDRNOTAVAIL;
1915                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1916                         goto err_exit;
1917
1918                 memset(&p, 0, sizeof(p));
1919                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1920                 p.iph.saddr = 0;
1921                 p.iph.version = 4;
1922                 p.iph.ihl = 5;
1923                 p.iph.protocol = IPPROTO_IPV6;
1924                 p.iph.ttl = 64;
1925                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1926
1927                 oldfs = get_fs(); set_fs(KERNEL_DS);
1928                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1929                 set_fs(oldfs);
1930
1931                 if (err == 0) {
1932                         err = -ENOBUFS;
1933                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1934                                 goto err_exit;
1935                         err = dev_open(dev);
1936                 }
1937         }
1938 #endif
1939
1940 err_exit:
1941         rtnl_unlock();
1942         return err;
1943 }
1944
1945 /*
1946  *      Manual configuration of address on an interface
1947  */
1948 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1949                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1950 {
1951         struct inet6_ifaddr *ifp;
1952         struct inet6_dev *idev;
1953         struct net_device *dev;
1954         int scope;
1955         u32 flags = RTF_EXPIRES;
1956
1957         ASSERT_RTNL();
1958
1959         /* check the lifetime */
1960         if (!valid_lft || prefered_lft > valid_lft)
1961                 return -EINVAL;
1962
1963         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1964                 return -ENODEV;
1965
1966         if ((idev = addrconf_add_dev(dev)) == NULL)
1967                 return -ENOBUFS;
1968
1969         scope = ipv6_addr_scope(pfx);
1970
1971         if (valid_lft == INFINITY_LIFE_TIME) {
1972                 ifa_flags |= IFA_F_PERMANENT;
1973                 flags = 0;
1974         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1975                 valid_lft = 0x7FFFFFFF/HZ;
1976
1977         if (prefered_lft == 0)
1978                 ifa_flags |= IFA_F_DEPRECATED;
1979         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1980                  (prefered_lft != INFINITY_LIFE_TIME))
1981                 prefered_lft = 0x7FFFFFFF/HZ;
1982
1983         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1984
1985         if (!IS_ERR(ifp)) {
1986                 spin_lock_bh(&ifp->lock);
1987                 ifp->valid_lft = valid_lft;
1988                 ifp->prefered_lft = prefered_lft;
1989                 ifp->tstamp = jiffies;
1990                 spin_unlock_bh(&ifp->lock);
1991
1992                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1993                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1994                 /*
1995                  * Note that section 3.1 of RFC 4429 indicates
1996                  * that the Optimistic flag should not be set for
1997                  * manually configured addresses
1998                  */
1999                 addrconf_dad_start(ifp, 0);
2000                 in6_ifa_put(ifp);
2001                 addrconf_verify(0);
2002                 return 0;
2003         }
2004
2005         return PTR_ERR(ifp);
2006 }
2007
2008 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
2009 {
2010         struct inet6_ifaddr *ifp;
2011         struct inet6_dev *idev;
2012         struct net_device *dev;
2013
2014         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
2015                 return -ENODEV;
2016
2017         if ((idev = __in6_dev_get(dev)) == NULL)
2018                 return -ENXIO;
2019
2020         read_lock_bh(&idev->lock);
2021         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2022                 if (ifp->prefix_len == plen &&
2023                     ipv6_addr_equal(pfx, &ifp->addr)) {
2024                         in6_ifa_hold(ifp);
2025                         read_unlock_bh(&idev->lock);
2026
2027                         ipv6_del_addr(ifp);
2028
2029                         /* If the last address is deleted administratively,
2030                            disable IPv6 on this interface.
2031                          */
2032                         if (idev->addr_list == NULL)
2033                                 addrconf_ifdown(idev->dev, 1);
2034                         return 0;
2035                 }
2036         }
2037         read_unlock_bh(&idev->lock);
2038         return -EADDRNOTAVAIL;
2039 }
2040
2041
2042 int addrconf_add_ifaddr(void __user *arg)
2043 {
2044         struct in6_ifreq ireq;
2045         int err;
2046
2047         if (!capable(CAP_NET_ADMIN))
2048                 return -EPERM;
2049
2050         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2051                 return -EFAULT;
2052
2053         rtnl_lock();
2054         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2055                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2056         rtnl_unlock();
2057         return err;
2058 }
2059
2060 int addrconf_del_ifaddr(void __user *arg)
2061 {
2062         struct in6_ifreq ireq;
2063         int err;
2064
2065         if (!capable(CAP_NET_ADMIN))
2066                 return -EPERM;
2067
2068         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2069                 return -EFAULT;
2070
2071         rtnl_lock();
2072         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2073         rtnl_unlock();
2074         return err;
2075 }
2076
2077 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2078 static void sit_add_v4_addrs(struct inet6_dev *idev)
2079 {
2080         struct inet6_ifaddr * ifp;
2081         struct in6_addr addr;
2082         struct net_device *dev;
2083         int scope;
2084
2085         ASSERT_RTNL();
2086
2087         memset(&addr, 0, sizeof(struct in6_addr));
2088         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2089
2090         if (idev->dev->flags&IFF_POINTOPOINT) {
2091                 addr.s6_addr32[0] = htonl(0xfe800000);
2092                 scope = IFA_LINK;
2093         } else {
2094                 scope = IPV6_ADDR_COMPATv4;
2095         }
2096
2097         if (addr.s6_addr32[3]) {
2098                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2099                 if (!IS_ERR(ifp)) {
2100                         spin_lock_bh(&ifp->lock);
2101                         ifp->flags &= ~IFA_F_TENTATIVE;
2102                         spin_unlock_bh(&ifp->lock);
2103                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2104                         in6_ifa_put(ifp);
2105                 }
2106                 return;
2107         }
2108
2109         for_each_netdev(&init_net, dev) {
2110                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2111                 if (in_dev && (dev->flags & IFF_UP)) {
2112                         struct in_ifaddr * ifa;
2113
2114                         int flag = scope;
2115
2116                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2117                                 int plen;
2118
2119                                 addr.s6_addr32[3] = ifa->ifa_local;
2120
2121                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2122                                         continue;
2123                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2124                                         if (idev->dev->flags&IFF_POINTOPOINT)
2125                                                 continue;
2126                                         flag |= IFA_HOST;
2127                                 }
2128                                 if (idev->dev->flags&IFF_POINTOPOINT)
2129                                         plen = 64;
2130                                 else
2131                                         plen = 96;
2132
2133                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2134                                                     IFA_F_PERMANENT);
2135                                 if (!IS_ERR(ifp)) {
2136                                         spin_lock_bh(&ifp->lock);
2137                                         ifp->flags &= ~IFA_F_TENTATIVE;
2138                                         spin_unlock_bh(&ifp->lock);
2139                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2140                                         in6_ifa_put(ifp);
2141                                 }
2142                         }
2143                 }
2144         }
2145 }
2146 #endif
2147
2148 static void init_loopback(struct net_device *dev)
2149 {
2150         struct inet6_dev  *idev;
2151         struct inet6_ifaddr * ifp;
2152
2153         /* ::1 */
2154
2155         ASSERT_RTNL();
2156
2157         if ((idev = ipv6_find_idev(dev)) == NULL) {
2158                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2159                 return;
2160         }
2161
2162         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2163         if (!IS_ERR(ifp)) {
2164                 spin_lock_bh(&ifp->lock);
2165                 ifp->flags &= ~IFA_F_TENTATIVE;
2166                 spin_unlock_bh(&ifp->lock);
2167                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2168                 in6_ifa_put(ifp);
2169         }
2170 }
2171
2172 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2173 {
2174         struct inet6_ifaddr * ifp;
2175         u32 addr_flags = IFA_F_PERMANENT;
2176
2177 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2178         if (idev->cnf.optimistic_dad &&
2179             !ipv6_devconf.forwarding)
2180                 addr_flags |= IFA_F_OPTIMISTIC;
2181 #endif
2182
2183
2184         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2185         if (!IS_ERR(ifp)) {
2186                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2187                 addrconf_dad_start(ifp, 0);
2188                 in6_ifa_put(ifp);
2189         }
2190 }
2191
2192 static void addrconf_dev_config(struct net_device *dev)
2193 {
2194         struct in6_addr addr;
2195         struct inet6_dev    * idev;
2196
2197         ASSERT_RTNL();
2198
2199         if ((dev->type != ARPHRD_ETHER) &&
2200             (dev->type != ARPHRD_FDDI) &&
2201             (dev->type != ARPHRD_IEEE802_TR) &&
2202             (dev->type != ARPHRD_ARCNET) &&
2203             (dev->type != ARPHRD_INFINIBAND)) {
2204                 /* Alas, we support only Ethernet autoconfiguration. */
2205                 return;
2206         }
2207
2208         idev = addrconf_add_dev(dev);
2209         if (idev == NULL)
2210                 return;
2211
2212         memset(&addr, 0, sizeof(struct in6_addr));
2213         addr.s6_addr32[0] = htonl(0xFE800000);
2214
2215         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2216                 addrconf_add_linklocal(idev, &addr);
2217 }
2218
2219 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2220 static void addrconf_sit_config(struct net_device *dev)
2221 {
2222         struct inet6_dev *idev;
2223
2224         ASSERT_RTNL();
2225
2226         /*
2227          * Configure the tunnel with one of our IPv4
2228          * addresses... we should configure all of
2229          * our v4 addrs in the tunnel
2230          */
2231
2232         if ((idev = ipv6_find_idev(dev)) == NULL) {
2233                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2234                 return;
2235         }
2236
2237         if (dev->priv_flags & IFF_ISATAP) {
2238                 struct in6_addr addr;
2239
2240                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2241                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2242                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2243                         addrconf_add_linklocal(idev, &addr);
2244                 return;
2245         }
2246
2247         sit_add_v4_addrs(idev);
2248
2249         if (dev->flags&IFF_POINTOPOINT) {
2250                 addrconf_add_mroute(dev);
2251                 addrconf_add_lroute(dev);
2252         } else
2253                 sit_route_add(dev);
2254 }
2255 #endif
2256
2257 static inline int
2258 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2259 {
2260         struct in6_addr lladdr;
2261
2262         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2263                 addrconf_add_linklocal(idev, &lladdr);
2264                 return 0;
2265         }
2266         return -1;
2267 }
2268
2269 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2270 {
2271         struct net_device *link_dev;
2272
2273         /* first try to inherit the link-local address from the link device */
2274         if (idev->dev->iflink &&
2275             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2276                 if (!ipv6_inherit_linklocal(idev, link_dev))
2277                         return;
2278         }
2279         /* then try to inherit it from any device */
2280         for_each_netdev(&init_net, link_dev) {
2281                 if (!ipv6_inherit_linklocal(idev, link_dev))
2282                         return;
2283         }
2284         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2285 }
2286
2287 /*
2288  * Autoconfigure tunnel with a link-local address so routing protocols,
2289  * DHCPv6, MLD etc. can be run over the virtual link
2290  */
2291
2292 static void addrconf_ip6_tnl_config(struct net_device *dev)
2293 {
2294         struct inet6_dev *idev;
2295
2296         ASSERT_RTNL();
2297
2298         if ((idev = addrconf_add_dev(dev)) == NULL) {
2299                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2300                 return;
2301         }
2302         ip6_tnl_add_linklocal(idev);
2303 }
2304
2305 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2306                            void * data)
2307 {
2308         struct net_device *dev = (struct net_device *) data;
2309         struct inet6_dev *idev = __in6_dev_get(dev);
2310         int run_pending = 0;
2311         int err;
2312
2313         if (dev->nd_net != &init_net)
2314                 return NOTIFY_DONE;
2315
2316         switch(event) {
2317         case NETDEV_REGISTER:
2318                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2319                         idev = ipv6_add_dev(dev);
2320                         if (!idev)
2321                                 return notifier_from_errno(-ENOMEM);
2322                 }
2323                 break;
2324         case NETDEV_UP:
2325         case NETDEV_CHANGE:
2326                 if (dev->flags & IFF_SLAVE)
2327                         break;
2328
2329                 if (event == NETDEV_UP) {
2330                         if (!addrconf_qdisc_ok(dev)) {
2331                                 /* device is not ready yet. */
2332                                 printk(KERN_INFO
2333                                         "ADDRCONF(NETDEV_UP): %s: "
2334                                         "link is not ready\n",
2335                                         dev->name);
2336                                 break;
2337                         }
2338
2339                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2340                                 idev = ipv6_add_dev(dev);
2341
2342                         if (idev)
2343                                 idev->if_flags |= IF_READY;
2344                 } else {
2345                         if (!addrconf_qdisc_ok(dev)) {
2346                                 /* device is still not ready. */
2347                                 break;
2348                         }
2349
2350                         if (idev) {
2351                                 if (idev->if_flags & IF_READY) {
2352                                         /* device is already configured. */
2353                                         break;
2354                                 }
2355                                 idev->if_flags |= IF_READY;
2356                         }
2357
2358                         printk(KERN_INFO
2359                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2360                                         "link becomes ready\n",
2361                                         dev->name);
2362
2363                         run_pending = 1;
2364                 }
2365
2366                 switch(dev->type) {
2367 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2368                 case ARPHRD_SIT:
2369                         addrconf_sit_config(dev);
2370                         break;
2371 #endif
2372                 case ARPHRD_TUNNEL6:
2373                         addrconf_ip6_tnl_config(dev);
2374                         break;
2375                 case ARPHRD_LOOPBACK:
2376                         init_loopback(dev);
2377                         break;
2378
2379                 default:
2380                         addrconf_dev_config(dev);
2381                         break;
2382                 }
2383                 if (idev) {
2384                         if (run_pending)
2385                                 addrconf_dad_run(idev);
2386
2387                         /* If the MTU changed during the interface down, when the
2388                            interface up, the changed MTU must be reflected in the
2389                            idev as well as routers.
2390                          */
2391                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2392                                 rt6_mtu_change(dev, dev->mtu);
2393                                 idev->cnf.mtu6 = dev->mtu;
2394                         }
2395                         idev->tstamp = jiffies;
2396                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2397                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2398                            stop IPv6 on this interface.
2399                          */
2400                         if (dev->mtu < IPV6_MIN_MTU)
2401                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2402                 }
2403                 break;
2404
2405         case NETDEV_CHANGEMTU:
2406                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2407                         rt6_mtu_change(dev, dev->mtu);
2408                         idev->cnf.mtu6 = dev->mtu;
2409                         break;
2410                 }
2411
2412                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2413                         idev = ipv6_add_dev(dev);
2414                         if (idev)
2415                                 break;
2416                 }
2417
2418                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2419
2420         case NETDEV_DOWN:
2421         case NETDEV_UNREGISTER:
2422                 /*
2423                  *      Remove all addresses from this interface.
2424                  */
2425                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2426                 break;
2427
2428         case NETDEV_CHANGENAME:
2429                 if (idev) {
2430                         snmp6_unregister_dev(idev);
2431                         addrconf_sysctl_unregister(idev);
2432                         addrconf_sysctl_register(idev);
2433                         err = snmp6_register_dev(idev);
2434                         if (err)
2435                                 return notifier_from_errno(err);
2436                 }
2437                 break;
2438         }
2439
2440         return NOTIFY_OK;
2441 }
2442
2443 /*
2444  *      addrconf module should be notified of a device going up
2445  */
2446 static struct notifier_block ipv6_dev_notf = {
2447         .notifier_call = addrconf_notify,
2448         .priority = 0
2449 };
2450
2451 static int addrconf_ifdown(struct net_device *dev, int how)
2452 {
2453         struct inet6_dev *idev;
2454         struct inet6_ifaddr *ifa, **bifa;
2455         int i;
2456
2457         ASSERT_RTNL();
2458
2459         if ((dev->flags & IFF_LOOPBACK) && how == 1)
2460                 how = 0;
2461
2462         rt6_ifdown(dev);
2463         neigh_ifdown(&nd_tbl, dev);
2464
2465         idev = __in6_dev_get(dev);
2466         if (idev == NULL)
2467                 return -ENODEV;
2468
2469         /* Step 1: remove reference to ipv6 device from parent device.
2470                    Do not dev_put!
2471          */
2472         if (how) {
2473                 idev->dead = 1;
2474
2475                 /* protected by rtnl_lock */
2476                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2477
2478                 /* Step 1.5: remove snmp6 entry */
2479                 snmp6_unregister_dev(idev);
2480
2481         }
2482
2483         /* Step 2: clear hash table */
2484         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2485                 bifa = &inet6_addr_lst[i];
2486
2487                 write_lock_bh(&addrconf_hash_lock);
2488                 while ((ifa = *bifa) != NULL) {
2489                         if (ifa->idev == idev) {
2490                                 *bifa = ifa->lst_next;
2491                                 ifa->lst_next = NULL;
2492                                 addrconf_del_timer(ifa);
2493                                 in6_ifa_put(ifa);
2494                                 continue;
2495                         }
2496                         bifa = &ifa->lst_next;
2497                 }
2498                 write_unlock_bh(&addrconf_hash_lock);
2499         }
2500
2501         write_lock_bh(&idev->lock);
2502
2503         /* Step 3: clear flags for stateless addrconf */
2504         if (!how)
2505                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2506
2507         /* Step 4: clear address list */
2508 #ifdef CONFIG_IPV6_PRIVACY
2509         if (how && del_timer(&idev->regen_timer))
2510                 in6_dev_put(idev);
2511
2512         /* clear tempaddr list */
2513         while ((ifa = idev->tempaddr_list) != NULL) {
2514                 idev->tempaddr_list = ifa->tmp_next;
2515                 ifa->tmp_next = NULL;
2516                 ifa->dead = 1;
2517                 write_unlock_bh(&idev->lock);
2518                 spin_lock_bh(&ifa->lock);
2519
2520                 if (ifa->ifpub) {
2521                         in6_ifa_put(ifa->ifpub);
2522                         ifa->ifpub = NULL;
2523                 }
2524                 spin_unlock_bh(&ifa->lock);
2525                 in6_ifa_put(ifa);
2526                 write_lock_bh(&idev->lock);
2527         }
2528 #endif
2529         while ((ifa = idev->addr_list) != NULL) {
2530                 idev->addr_list = ifa->if_next;
2531                 ifa->if_next = NULL;
2532                 ifa->dead = 1;
2533                 addrconf_del_timer(ifa);
2534                 write_unlock_bh(&idev->lock);
2535
2536                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2537                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2538                 in6_ifa_put(ifa);
2539
2540                 write_lock_bh(&idev->lock);
2541         }
2542         write_unlock_bh(&idev->lock);
2543
2544         /* Step 5: Discard multicast list */
2545
2546         if (how)
2547                 ipv6_mc_destroy_dev(idev);
2548         else
2549                 ipv6_mc_down(idev);
2550
2551         idev->tstamp = jiffies;
2552
2553         /* Shot the device (if unregistered) */
2554
2555         if (how) {
2556                 addrconf_sysctl_unregister(idev);
2557                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2558                 neigh_ifdown(&nd_tbl, dev);
2559                 in6_dev_put(idev);
2560         }
2561         return 0;
2562 }
2563
2564 static void addrconf_rs_timer(unsigned long data)
2565 {
2566         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2567
2568         if (ifp->idev->cnf.forwarding)
2569                 goto out;
2570
2571         if (ifp->idev->if_flags & IF_RA_RCVD) {
2572                 /*
2573                  *      Announcement received after solicitation
2574                  *      was sent
2575                  */
2576                 goto out;
2577         }
2578
2579         spin_lock(&ifp->lock);
2580         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2581                 struct in6_addr all_routers;
2582
2583                 /* The wait after the last probe can be shorter */
2584                 addrconf_mod_timer(ifp, AC_RS,
2585                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2586                                    ifp->idev->cnf.rtr_solicit_delay :
2587                                    ifp->idev->cnf.rtr_solicit_interval);
2588                 spin_unlock(&ifp->lock);
2589
2590                 ipv6_addr_all_routers(&all_routers);
2591
2592                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2593         } else {
2594                 spin_unlock(&ifp->lock);
2595                 /*
2596                  * Note: we do not support deprecated "all on-link"
2597                  * assumption any longer.
2598                  */
2599                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2600                        ifp->idev->dev->name);
2601         }
2602
2603 out:
2604         in6_ifa_put(ifp);
2605 }
2606
2607 /*
2608  *      Duplicate Address Detection
2609  */
2610 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2611 {
2612         unsigned long rand_num;
2613         struct inet6_dev *idev = ifp->idev;
2614
2615         if (ifp->flags & IFA_F_OPTIMISTIC)
2616                 rand_num = 0;
2617         else
2618                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2619
2620         ifp->probes = idev->cnf.dad_transmits;
2621         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2622 }
2623
2624 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2625 {
2626         struct inet6_dev *idev = ifp->idev;
2627         struct net_device *dev = idev->dev;
2628
2629         addrconf_join_solict(dev, &ifp->addr);
2630
2631         net_srandom(ifp->addr.s6_addr32[3]);
2632
2633         read_lock_bh(&idev->lock);
2634         if (ifp->dead)
2635                 goto out;
2636         spin_lock_bh(&ifp->lock);
2637
2638         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2639             !(ifp->flags&IFA_F_TENTATIVE) ||
2640             ifp->flags & IFA_F_NODAD) {
2641                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2642                 spin_unlock_bh(&ifp->lock);
2643                 read_unlock_bh(&idev->lock);
2644
2645                 addrconf_dad_completed(ifp);
2646                 return;
2647         }
2648
2649         if (!(idev->if_flags & IF_READY)) {
2650                 spin_unlock_bh(&ifp->lock);
2651                 read_unlock_bh(&idev->lock);
2652                 /*
2653                  * If the defice is not ready:
2654                  * - keep it tentative if it is a permanent address.
2655                  * - otherwise, kill it.
2656                  */
2657                 in6_ifa_hold(ifp);
2658                 addrconf_dad_stop(ifp);
2659                 return;
2660         }
2661
2662         /*
2663          * Optimistic nodes can start receiving
2664          * Frames right away
2665          */
2666         if(ifp->flags & IFA_F_OPTIMISTIC)
2667                 ip6_ins_rt(ifp->rt);
2668
2669         addrconf_dad_kick(ifp);
2670         spin_unlock_bh(&ifp->lock);
2671 out:
2672         read_unlock_bh(&idev->lock);
2673 }
2674
2675 static void addrconf_dad_timer(unsigned long data)
2676 {
2677         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2678         struct inet6_dev *idev = ifp->idev;
2679         struct in6_addr unspec;
2680         struct in6_addr mcaddr;
2681
2682         read_lock_bh(&idev->lock);
2683         if (idev->dead) {
2684                 read_unlock_bh(&idev->lock);
2685                 goto out;
2686         }
2687         spin_lock_bh(&ifp->lock);
2688         if (ifp->probes == 0) {
2689                 /*
2690                  * DAD was successful
2691                  */
2692
2693                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2694                 spin_unlock_bh(&ifp->lock);
2695                 read_unlock_bh(&idev->lock);
2696
2697                 addrconf_dad_completed(ifp);
2698
2699                 goto out;
2700         }
2701
2702         ifp->probes--;
2703         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2704         spin_unlock_bh(&ifp->lock);
2705         read_unlock_bh(&idev->lock);
2706
2707         /* send a neighbour solicitation for our addr */
2708         memset(&unspec, 0, sizeof(unspec));
2709         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2710         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2711 out:
2712         in6_ifa_put(ifp);
2713 }
2714
2715 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2716 {
2717         struct net_device *     dev = ifp->idev->dev;
2718
2719         /*
2720          *      Configure the address for reception. Now it is valid.
2721          */
2722
2723         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2724
2725         /* If added prefix is link local and forwarding is off,
2726            start sending router solicitations.
2727          */
2728
2729         if (ifp->idev->cnf.forwarding == 0 &&
2730             ifp->idev->cnf.rtr_solicits > 0 &&
2731             (dev->flags&IFF_LOOPBACK) == 0 &&
2732             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2733                 struct in6_addr all_routers;
2734
2735                 ipv6_addr_all_routers(&all_routers);
2736
2737                 /*
2738                  *      If a host as already performed a random delay
2739                  *      [...] as part of DAD [...] there is no need
2740                  *      to delay again before sending the first RS
2741                  */
2742                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2743
2744                 spin_lock_bh(&ifp->lock);
2745                 ifp->probes = 1;
2746                 ifp->idev->if_flags |= IF_RS_SENT;
2747                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2748                 spin_unlock_bh(&ifp->lock);
2749         }
2750 }
2751
2752 static void addrconf_dad_run(struct inet6_dev *idev) {
2753         struct inet6_ifaddr *ifp;
2754
2755         read_lock_bh(&idev->lock);
2756         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2757                 spin_lock_bh(&ifp->lock);
2758                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2759                         spin_unlock_bh(&ifp->lock);
2760                         continue;
2761                 }
2762                 spin_unlock_bh(&ifp->lock);
2763                 addrconf_dad_kick(ifp);
2764         }
2765         read_unlock_bh(&idev->lock);
2766 }
2767
2768 #ifdef CONFIG_PROC_FS
2769 struct if6_iter_state {
2770         struct seq_net_private p;
2771         int bucket;
2772 };
2773
2774 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2775 {
2776         struct inet6_ifaddr *ifa = NULL;
2777         struct if6_iter_state *state = seq->private;
2778         struct net *net = state->p.net;
2779
2780         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2781                 ifa = inet6_addr_lst[state->bucket];
2782
2783                 while (ifa && ifa->idev->dev->nd_net != net)
2784                         ifa = ifa->lst_next;
2785                 if (ifa)
2786                         break;
2787         }
2788         return ifa;
2789 }
2790
2791 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2792 {
2793         struct if6_iter_state *state = seq->private;
2794         struct net *net = state->p.net;
2795
2796         ifa = ifa->lst_next;
2797 try_again:
2798         if (ifa) {
2799                 if (ifa->idev->dev->nd_net != net) {
2800                         ifa = ifa->lst_next;
2801                         goto try_again;
2802                 }
2803         }
2804
2805         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2806                 ifa = inet6_addr_lst[state->bucket];
2807                 goto try_again;
2808         }
2809
2810         return ifa;
2811 }
2812
2813 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2814 {
2815         struct inet6_ifaddr *ifa = if6_get_first(seq);
2816
2817         if (ifa)
2818                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2819                         --pos;
2820         return pos ? NULL : ifa;
2821 }
2822
2823 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2824         __acquires(addrconf_hash_lock)
2825 {
2826         read_lock_bh(&addrconf_hash_lock);
2827         return if6_get_idx(seq, *pos);
2828 }
2829
2830 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2831 {
2832         struct inet6_ifaddr *ifa;
2833
2834         ifa = if6_get_next(seq, v);
2835         ++*pos;
2836         return ifa;
2837 }
2838
2839 static void if6_seq_stop(struct seq_file *seq, void *v)
2840         __releases(addrconf_hash_lock)
2841 {
2842         read_unlock_bh(&addrconf_hash_lock);
2843 }
2844
2845 static int if6_seq_show(struct seq_file *seq, void *v)
2846 {
2847         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2848         seq_printf(seq,
2849                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2850                    NIP6(ifp->addr),
2851                    ifp->idev->dev->ifindex,
2852                    ifp->prefix_len,
2853                    ifp->scope,
2854                    ifp->flags,
2855                    ifp->idev->dev->name);
2856         return 0;
2857 }
2858
2859 static const struct seq_operations if6_seq_ops = {
2860         .start  = if6_seq_start,
2861         .next   = if6_seq_next,
2862         .show   = if6_seq_show,
2863         .stop   = if6_seq_stop,
2864 };
2865
2866 static int if6_seq_open(struct inode *inode, struct file *file)
2867 {
2868         return seq_open_net(inode, file, &if6_seq_ops,
2869                             sizeof(struct if6_iter_state));
2870 }
2871
2872 static const struct file_operations if6_fops = {
2873         .owner          = THIS_MODULE,
2874         .open           = if6_seq_open,
2875         .read           = seq_read,
2876         .llseek         = seq_lseek,
2877         .release        = seq_release_net,
2878 };
2879
2880 static int if6_proc_net_init(struct net *net)
2881 {
2882         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2883                 return -ENOMEM;
2884         return 0;
2885 }
2886
2887 static void if6_proc_net_exit(struct net *net)
2888 {
2889        proc_net_remove(net, "if_inet6");
2890 }
2891
2892 static struct pernet_operations if6_proc_net_ops = {
2893        .init = if6_proc_net_init,
2894        .exit = if6_proc_net_exit,
2895 };
2896
2897 int __init if6_proc_init(void)
2898 {
2899         return register_pernet_subsys(&if6_proc_net_ops);
2900 }
2901
2902 void if6_proc_exit(void)
2903 {
2904         unregister_pernet_subsys(&if6_proc_net_ops);
2905 }
2906 #endif  /* CONFIG_PROC_FS */
2907
2908 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2909 /* Check if address is a home address configured on any interface. */
2910 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2911 {
2912         int ret = 0;
2913         struct inet6_ifaddr * ifp;
2914         u8 hash = ipv6_addr_hash(addr);
2915         read_lock_bh(&addrconf_hash_lock);
2916         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2917                 if (ifp->idev->dev->nd_net != net)
2918                         continue;
2919                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2920                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2921                         ret = 1;
2922                         break;
2923                 }
2924         }
2925         read_unlock_bh(&addrconf_hash_lock);
2926         return ret;
2927 }
2928 #endif
2929
2930 /*
2931  *      Periodic address status verification
2932  */
2933
2934 static void addrconf_verify(unsigned long foo)
2935 {
2936         struct inet6_ifaddr *ifp;
2937         unsigned long now, next;
2938         int i;
2939
2940         spin_lock_bh(&addrconf_verify_lock);
2941         now = jiffies;
2942         next = now + ADDR_CHECK_FREQUENCY;
2943
2944         del_timer(&addr_chk_timer);
2945
2946         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2947
2948 restart:
2949                 read_lock(&addrconf_hash_lock);
2950                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2951                         unsigned long age;
2952 #ifdef CONFIG_IPV6_PRIVACY
2953                         unsigned long regen_advance;
2954 #endif
2955
2956                         if (ifp->flags & IFA_F_PERMANENT)
2957                                 continue;
2958
2959                         spin_lock(&ifp->lock);
2960                         age = (now - ifp->tstamp) / HZ;
2961
2962 #ifdef CONFIG_IPV6_PRIVACY
2963                         regen_advance = ifp->idev->cnf.regen_max_retry *
2964                                         ifp->idev->cnf.dad_transmits *
2965                                         ifp->idev->nd_parms->retrans_time / HZ;
2966 #endif
2967
2968                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2969                             age >= ifp->valid_lft) {
2970                                 spin_unlock(&ifp->lock);
2971                                 in6_ifa_hold(ifp);
2972                                 read_unlock(&addrconf_hash_lock);
2973                                 ipv6_del_addr(ifp);
2974                                 goto restart;
2975                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2976                                 spin_unlock(&ifp->lock);
2977                                 continue;
2978                         } else if (age >= ifp->prefered_lft) {
2979                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2980                                 int deprecate = 0;
2981
2982                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2983                                         deprecate = 1;
2984                                         ifp->flags |= IFA_F_DEPRECATED;
2985                                 }
2986
2987                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2988                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2989
2990                                 spin_unlock(&ifp->lock);
2991
2992                                 if (deprecate) {
2993                                         in6_ifa_hold(ifp);
2994                                         read_unlock(&addrconf_hash_lock);
2995
2996                                         ipv6_ifa_notify(0, ifp);
2997                                         in6_ifa_put(ifp);
2998                                         goto restart;
2999                                 }
3000 #ifdef CONFIG_IPV6_PRIVACY
3001                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3002                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3003                                 if (age >= ifp->prefered_lft - regen_advance) {
3004                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3005                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3006                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3007                                         if (!ifp->regen_count && ifpub) {
3008                                                 ifp->regen_count++;
3009                                                 in6_ifa_hold(ifp);
3010                                                 in6_ifa_hold(ifpub);
3011                                                 spin_unlock(&ifp->lock);
3012                                                 read_unlock(&addrconf_hash_lock);
3013                                                 spin_lock(&ifpub->lock);
3014                                                 ifpub->regen_count = 0;
3015                                                 spin_unlock(&ifpub->lock);
3016                                                 ipv6_create_tempaddr(ifpub, ifp);
3017                                                 in6_ifa_put(ifpub);
3018                                                 in6_ifa_put(ifp);
3019                                                 goto restart;
3020                                         }
3021                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3022                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3023                                 spin_unlock(&ifp->lock);
3024 #endif
3025                         } else {
3026                                 /* ifp->prefered_lft <= ifp->valid_lft */
3027                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3028                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3029                                 spin_unlock(&ifp->lock);
3030                         }
3031                 }
3032                 read_unlock(&addrconf_hash_lock);
3033         }
3034
3035         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3036         add_timer(&addr_chk_timer);
3037         spin_unlock_bh(&addrconf_verify_lock);
3038 }
3039
3040 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3041 {
3042         struct in6_addr *pfx = NULL;
3043
3044         if (addr)
3045                 pfx = nla_data(addr);
3046
3047         if (local) {
3048                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3049                         pfx = NULL;
3050                 else
3051                         pfx = nla_data(local);
3052         }
3053
3054         return pfx;
3055 }
3056
3057 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3058         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3059         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3060         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3061 };
3062
3063 static int
3064 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3065 {
3066         struct net *net = skb->sk->sk_net;
3067         struct ifaddrmsg *ifm;
3068         struct nlattr *tb[IFA_MAX+1];
3069         struct in6_addr *pfx;
3070         int err;
3071
3072         if (net != &init_net)
3073                 return -EINVAL;
3074
3075         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3076         if (err < 0)
3077                 return err;
3078
3079         ifm = nlmsg_data(nlh);
3080         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3081         if (pfx == NULL)
3082                 return -EINVAL;
3083
3084         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3085 }
3086
3087 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3088                              u32 prefered_lft, u32 valid_lft)
3089 {
3090         u32 flags = RTF_EXPIRES;
3091
3092         if (!valid_lft || (prefered_lft > valid_lft))
3093                 return -EINVAL;
3094
3095         if (valid_lft == INFINITY_LIFE_TIME) {
3096                 ifa_flags |= IFA_F_PERMANENT;
3097                 flags = 0;
3098         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3099                 valid_lft = 0x7FFFFFFF/HZ;
3100
3101         if (prefered_lft == 0)
3102                 ifa_flags |= IFA_F_DEPRECATED;
3103         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3104                  (prefered_lft != INFINITY_LIFE_TIME))
3105                 prefered_lft = 0x7FFFFFFF/HZ;
3106
3107         spin_lock_bh(&ifp->lock);
3108         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3109         ifp->tstamp = jiffies;
3110         ifp->valid_lft = valid_lft;
3111         ifp->prefered_lft = prefered_lft;
3112
3113         spin_unlock_bh(&ifp->lock);
3114         if (!(ifp->flags&IFA_F_TENTATIVE))
3115                 ipv6_ifa_notify(0, ifp);
3116
3117         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3118                               jiffies_to_clock_t(valid_lft * HZ), flags);
3119         addrconf_verify(0);
3120
3121         return 0;
3122 }
3123
3124 static int
3125 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3126 {
3127         struct net *net = skb->sk->sk_net;
3128         struct ifaddrmsg *ifm;
3129         struct nlattr *tb[IFA_MAX+1];
3130         struct in6_addr *pfx;
3131         struct inet6_ifaddr *ifa;
3132         struct net_device *dev;
3133         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3134         u8 ifa_flags;
3135         int err;
3136
3137         if (net != &init_net)
3138                 return -EINVAL;
3139
3140         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3141         if (err < 0)
3142                 return err;
3143
3144         ifm = nlmsg_data(nlh);
3145         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3146         if (pfx == NULL)
3147                 return -EINVAL;
3148
3149         if (tb[IFA_CACHEINFO]) {
3150                 struct ifa_cacheinfo *ci;
3151
3152                 ci = nla_data(tb[IFA_CACHEINFO]);
3153                 valid_lft = ci->ifa_valid;
3154                 preferred_lft = ci->ifa_prefered;
3155         } else {
3156                 preferred_lft = INFINITY_LIFE_TIME;
3157                 valid_lft = INFINITY_LIFE_TIME;
3158         }
3159
3160         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3161         if (dev == NULL)
3162                 return -ENODEV;
3163
3164         /* We ignore other flags so far. */
3165         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3166
3167         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3168         if (ifa == NULL) {
3169                 /*
3170                  * It would be best to check for !NLM_F_CREATE here but
3171                  * userspace alreay relies on not having to provide this.
3172                  */
3173                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3174                                       ifa_flags, preferred_lft, valid_lft);
3175         }
3176
3177         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3178             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3179                 err = -EEXIST;
3180         else
3181                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3182
3183         in6_ifa_put(ifa);
3184
3185         return err;
3186 }
3187
3188 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3189                           u8 scope, int ifindex)
3190 {
3191         struct ifaddrmsg *ifm;
3192
3193         ifm = nlmsg_data(nlh);
3194         ifm->ifa_family = AF_INET6;
3195         ifm->ifa_prefixlen = prefixlen;
3196         ifm->ifa_flags = flags;
3197         ifm->ifa_scope = scope;
3198         ifm->ifa_index = ifindex;
3199 }
3200
3201 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3202                          unsigned long tstamp, u32 preferred, u32 valid)
3203 {
3204         struct ifa_cacheinfo ci;
3205
3206         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3207                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3208         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3209                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3210         ci.ifa_prefered = preferred;
3211         ci.ifa_valid = valid;
3212
3213         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3214 }
3215
3216 static inline int rt_scope(int ifa_scope)
3217 {
3218         if (ifa_scope & IFA_HOST)
3219                 return RT_SCOPE_HOST;
3220         else if (ifa_scope & IFA_LINK)
3221                 return RT_SCOPE_LINK;
3222         else if (ifa_scope & IFA_SITE)
3223                 return RT_SCOPE_SITE;
3224         else
3225                 return RT_SCOPE_UNIVERSE;
3226 }
3227
3228 static inline int inet6_ifaddr_msgsize(void)
3229 {
3230         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3231                + nla_total_size(16) /* IFA_ADDRESS */
3232                + nla_total_size(sizeof(struct ifa_cacheinfo));
3233 }
3234
3235 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3236                              u32 pid, u32 seq, int event, unsigned int flags)
3237 {
3238         struct nlmsghdr  *nlh;
3239         u32 preferred, valid;
3240
3241         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3242         if (nlh == NULL)
3243                 return -EMSGSIZE;
3244
3245         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3246                       ifa->idev->dev->ifindex);
3247
3248         if (!(ifa->flags&IFA_F_PERMANENT)) {
3249                 preferred = ifa->prefered_lft;
3250                 valid = ifa->valid_lft;
3251                 if (preferred != INFINITY_LIFE_TIME) {
3252                         long tval = (jiffies - ifa->tstamp)/HZ;
3253                         preferred -= tval;
3254                         if (valid != INFINITY_LIFE_TIME)
3255                                 valid -= tval;
3256                 }
3257         } else {
3258                 preferred = INFINITY_LIFE_TIME;
3259                 valid = INFINITY_LIFE_TIME;
3260         }
3261
3262         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3263             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3264                 nlmsg_cancel(skb, nlh);
3265                 return -EMSGSIZE;
3266         }
3267
3268         return nlmsg_end(skb, nlh);
3269 }
3270
3271 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3272                                 u32 pid, u32 seq, int event, u16 flags)
3273 {
3274         struct nlmsghdr  *nlh;
3275         u8 scope = RT_SCOPE_UNIVERSE;
3276         int ifindex = ifmca->idev->dev->ifindex;
3277
3278         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3279                 scope = RT_SCOPE_SITE;
3280
3281         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3282         if (nlh == NULL)
3283                 return -EMSGSIZE;
3284
3285         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3286         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3287             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3288                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3289                 nlmsg_cancel(skb, nlh);
3290                 return -EMSGSIZE;
3291         }
3292
3293         return nlmsg_end(skb, nlh);
3294 }
3295
3296 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3297                                 u32 pid, u32 seq, int event, unsigned int flags)
3298 {
3299         struct nlmsghdr  *nlh;
3300         u8 scope = RT_SCOPE_UNIVERSE;
3301         int ifindex = ifaca->aca_idev->dev->ifindex;
3302
3303         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3304                 scope = RT_SCOPE_SITE;
3305
3306         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3307         if (nlh == NULL)
3308                 return -EMSGSIZE;
3309
3310         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3311         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3312             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3313                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3314                 nlmsg_cancel(skb, nlh);
3315                 return -EMSGSIZE;
3316         }
3317
3318         return nlmsg_end(skb, nlh);
3319 }
3320
3321 enum addr_type_t
3322 {
3323         UNICAST_ADDR,
3324         MULTICAST_ADDR,
3325         ANYCAST_ADDR,
3326 };
3327
3328 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3329                            enum addr_type_t type)
3330 {
3331         int idx, ip_idx;
3332         int s_idx, s_ip_idx;
3333         int err = 1;
3334         struct net_device *dev;
3335         struct inet6_dev *idev = NULL;
3336         struct inet6_ifaddr *ifa;
3337         struct ifmcaddr6 *ifmca;
3338         struct ifacaddr6 *ifaca;
3339
3340         s_idx = cb->args[0];
3341         s_ip_idx = ip_idx = cb->args[1];
3342
3343         idx = 0;
3344         for_each_netdev(&init_net, dev) {
3345                 if (idx < s_idx)
3346                         goto cont;
3347                 if (idx > s_idx)
3348                         s_ip_idx = 0;
3349                 ip_idx = 0;
3350                 if ((idev = in6_dev_get(dev)) == NULL)
3351                         goto cont;
3352                 read_lock_bh(&idev->lock);
3353                 switch (type) {
3354                 case UNICAST_ADDR:
3355                         /* unicast address incl. temp addr */
3356                         for (ifa = idev->addr_list; ifa;
3357                              ifa = ifa->if_next, ip_idx++) {
3358                                 if (ip_idx < s_ip_idx)
3359                                         continue;
3360                                 err = inet6_fill_ifaddr(skb, ifa,
3361                                                         NETLINK_CB(cb->skb).pid,
3362                                                         cb->nlh->nlmsg_seq,
3363                                                         RTM_NEWADDR,
3364                                                         NLM_F_MULTI);
3365                         }
3366                         break;
3367                 case MULTICAST_ADDR:
3368                         /* multicast address */
3369                         for (ifmca = idev->mc_list; ifmca;
3370                              ifmca = ifmca->next, ip_idx++) {
3371                                 if (ip_idx < s_ip_idx)
3372                                         continue;
3373                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3374                                                           NETLINK_CB(cb->skb).pid,
3375                                                           cb->nlh->nlmsg_seq,
3376                                                           RTM_GETMULTICAST,
3377                                                           NLM_F_MULTI);
3378                         }
3379                         break;
3380                 case ANYCAST_ADDR:
3381                         /* anycast address */
3382                         for (ifaca = idev->ac_list; ifaca;
3383                              ifaca = ifaca->aca_next, ip_idx++) {
3384                                 if (ip_idx < s_ip_idx)
3385                                         continue;
3386                                 err = inet6_fill_ifacaddr(skb, ifaca,
3387                                                           NETLINK_CB(cb->skb).pid,
3388                                                           cb->nlh->nlmsg_seq,
3389                                                           RTM_GETANYCAST,
3390                                                           NLM_F_MULTI);
3391                         }
3392                         break;
3393                 default:
3394                         break;
3395                 }
3396                 read_unlock_bh(&idev->lock);
3397                 in6_dev_put(idev);
3398
3399                 if (err <= 0)
3400                         break;
3401 cont:
3402                 idx++;
3403         }
3404         cb->args[0] = idx;
3405         cb->args[1] = ip_idx;
3406         return skb->len;
3407 }
3408
3409 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3410 {
3411         struct net *net = skb->sk->sk_net;
3412         enum addr_type_t type = UNICAST_ADDR;
3413
3414         if (net != &init_net)
3415                 return 0;
3416
3417         return inet6_dump_addr(skb, cb, type);
3418 }
3419
3420 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3421 {
3422         struct net *net = skb->sk->sk_net;
3423         enum addr_type_t type = MULTICAST_ADDR;
3424
3425         if (net != &init_net)
3426                 return 0;
3427
3428         return inet6_dump_addr(skb, cb, type);
3429 }
3430
3431
3432 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3433 {
3434         struct net *net = skb->sk->sk_net;
3435         enum addr_type_t type = ANYCAST_ADDR;
3436
3437         if (net != &init_net)
3438                 return 0;
3439
3440         return inet6_dump_addr(skb, cb, type);
3441 }
3442
3443 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3444                              void *arg)
3445 {
3446         struct net *net = in_skb->sk->sk_net;
3447         struct ifaddrmsg *ifm;
3448         struct nlattr *tb[IFA_MAX+1];
3449         struct in6_addr *addr = NULL;
3450         struct net_device *dev = NULL;
3451         struct inet6_ifaddr *ifa;
3452         struct sk_buff *skb;
3453         int err;
3454
3455         if (net != &init_net)
3456                 return -EINVAL;
3457
3458         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3459         if (err < 0)
3460                 goto errout;
3461
3462         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3463         if (addr == NULL) {
3464                 err = -EINVAL;
3465                 goto errout;
3466         }
3467
3468         ifm = nlmsg_data(nlh);
3469         if (ifm->ifa_index)
3470                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3471
3472         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3473                 err = -EADDRNOTAVAIL;
3474                 goto errout;
3475         }
3476
3477         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3478                 err = -ENOBUFS;
3479                 goto errout_ifa;
3480         }
3481
3482         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3483                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3484         if (err < 0) {
3485                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3486                 WARN_ON(err == -EMSGSIZE);
3487                 kfree_skb(skb);
3488                 goto errout_ifa;
3489         }
3490         err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3491 errout_ifa:
3492         in6_ifa_put(ifa);
3493 errout:
3494         return err;
3495 }
3496
3497 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3498 {
3499         struct sk_buff *skb;
3500         int err = -ENOBUFS;
3501
3502         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3503         if (skb == NULL)
3504                 goto errout;
3505
3506         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3507         if (err < 0) {
3508                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3509                 WARN_ON(err == -EMSGSIZE);
3510                 kfree_skb(skb);
3511                 goto errout;
3512         }
3513         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3514 errout:
3515         if (err < 0)
3516                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3517 }
3518
3519 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3520                                 __s32 *array, int bytes)
3521 {
3522         BUG_ON(bytes < (DEVCONF_MAX * 4));
3523
3524         memset(array, 0, bytes);
3525         array[DEVCONF_FORWARDING] = cnf->forwarding;
3526         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3527         array[DEVCONF_MTU6] = cnf->mtu6;
3528         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3529         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3530         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3531         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3532         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3533         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3534         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3535         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3536 #ifdef CONFIG_IPV6_PRIVACY
3537         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3538         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3539         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3540         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3541         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3542 #endif
3543         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3544         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3545         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3546 #ifdef CONFIG_IPV6_ROUTER_PREF
3547         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3548         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3549 #ifdef CONFIG_IPV6_ROUTE_INFO
3550         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3551 #endif
3552 #endif
3553         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3554         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3555 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3556         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3557 #endif
3558 }
3559
3560 static inline size_t inet6_if_nlmsg_size(void)
3561 {
3562         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3563                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3564                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3565                + nla_total_size(4) /* IFLA_MTU */
3566                + nla_total_size(4) /* IFLA_LINK */
3567                + nla_total_size( /* IFLA_PROTINFO */
3568                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3569                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3570                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3571                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3572                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3573                  );
3574 }
3575
3576 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3577                                       int bytes)
3578 {
3579         int i;
3580         int pad = bytes - sizeof(u64) * items;
3581         BUG_ON(pad < 0);
3582
3583         /* Use put_unaligned() because stats may not be aligned for u64. */
3584         put_unaligned(items, &stats[0]);
3585         for (i = 1; i < items; i++)
3586                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3587
3588         memset(&stats[items], 0, pad);
3589 }
3590
3591 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3592                              int bytes)
3593 {
3594         switch(attrtype) {
3595         case IFLA_INET6_STATS:
3596                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3597                 break;
3598         case IFLA_INET6_ICMP6STATS:
3599                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3600                 break;
3601         }
3602 }
3603
3604 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3605                              u32 pid, u32 seq, int event, unsigned int flags)
3606 {
3607         struct net_device *dev = idev->dev;
3608         struct nlattr *nla;
3609         struct ifinfomsg *hdr;
3610         struct nlmsghdr *nlh;
3611         void *protoinfo;
3612         struct ifla_cacheinfo ci;
3613
3614         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3615         if (nlh == NULL)
3616                 return -EMSGSIZE;
3617
3618         hdr = nlmsg_data(nlh);
3619         hdr->ifi_family = AF_INET6;
3620         hdr->__ifi_pad = 0;
3621         hdr->ifi_type = dev->type;
3622         hdr->ifi_index = dev->ifindex;
3623         hdr->ifi_flags = dev_get_flags(dev);
3624         hdr->ifi_change = 0;
3625
3626         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3627
3628         if (dev->addr_len)
3629                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3630
3631         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3632         if (dev->ifindex != dev->iflink)
3633                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3634
3635         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3636         if (protoinfo == NULL)
3637                 goto nla_put_failure;
3638
3639         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3640
3641         ci.max_reasm_len = IPV6_MAXPLEN;
3642         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3643                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3644         ci.reachable_time = idev->nd_parms->reachable_time;
3645         ci.retrans_time = idev->nd_parms->retrans_time;
3646         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3647
3648         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3649         if (nla == NULL)
3650                 goto nla_put_failure;
3651         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3652
3653         /* XXX - MC not implemented */
3654
3655         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3656         if (nla == NULL)
3657                 goto nla_put_failure;
3658         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3659
3660         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3661         if (nla == NULL)
3662                 goto nla_put_failure;
3663         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3664
3665         nla_nest_end(skb, protoinfo);
3666         return nlmsg_end(skb, nlh);
3667
3668 nla_put_failure:
3669         nlmsg_cancel(skb, nlh);
3670         return -EMSGSIZE;
3671 }
3672
3673 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3674 {
3675         struct net *net = skb->sk->sk_net;
3676         int idx, err;
3677         int s_idx = cb->args[0];
3678         struct net_device *dev;
3679         struct inet6_dev *idev;
3680
3681         if (net != &init_net)
3682                 return 0;
3683
3684         read_lock(&dev_base_lock);
3685         idx = 0;
3686         for_each_netdev(&init_net, dev) {
3687                 if (idx < s_idx)
3688                         goto cont;
3689                 if ((idev = in6_dev_get(dev)) == NULL)
3690                         goto cont;
3691                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3692                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3693                 in6_dev_put(idev);
3694                 if (err <= 0)
3695                         break;
3696 cont:
3697                 idx++;
3698         }
3699         read_unlock(&dev_base_lock);
3700         cb->args[0] = idx;
3701
3702         return skb->len;
3703 }
3704
3705 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3706 {
3707         struct sk_buff *skb;
3708         int err = -ENOBUFS;
3709
3710         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3711         if (skb == NULL)
3712                 goto errout;
3713
3714         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3715         if (err < 0) {
3716                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3717                 WARN_ON(err == -EMSGSIZE);
3718                 kfree_skb(skb);
3719                 goto errout;
3720         }
3721         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3722 errout:
3723         if (err < 0)
3724                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3725 }
3726
3727 static inline size_t inet6_prefix_nlmsg_size(void)
3728 {
3729         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3730                + nla_total_size(sizeof(struct in6_addr))
3731                + nla_total_size(sizeof(struct prefix_cacheinfo));
3732 }
3733
3734 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3735                              struct prefix_info *pinfo, u32 pid, u32 seq,
3736                              int event, unsigned int flags)
3737 {
3738         struct prefixmsg *pmsg;
3739         struct nlmsghdr *nlh;
3740         struct prefix_cacheinfo ci;
3741
3742         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3743         if (nlh == NULL)
3744                 return -EMSGSIZE;
3745
3746         pmsg = nlmsg_data(nlh);
3747         pmsg->prefix_family = AF_INET6;
3748         pmsg->prefix_pad1 = 0;
3749         pmsg->prefix_pad2 = 0;
3750         pmsg->prefix_ifindex = idev->dev->ifindex;
3751         pmsg->prefix_len = pinfo->prefix_len;
3752         pmsg->prefix_type = pinfo->type;
3753         pmsg->prefix_pad3 = 0;
3754         pmsg->prefix_flags = 0;
3755         if (pinfo->onlink)
3756                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3757         if (pinfo->autoconf)
3758                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3759
3760         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3761
3762         ci.preferred_time = ntohl(pinfo->prefered);
3763         ci.valid_time = ntohl(pinfo->valid);
3764         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3765
3766         return nlmsg_end(skb, nlh);
3767
3768 nla_put_failure:
3769         nlmsg_cancel(skb, nlh);
3770         return -EMSGSIZE;
3771 }
3772
3773 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3774                          struct prefix_info *pinfo)
3775 {
3776         struct sk_buff *skb;
3777         int err = -ENOBUFS;
3778
3779         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3780         if (skb == NULL)
3781                 goto errout;
3782
3783         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3784         if (err < 0) {
3785                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3786                 WARN_ON(err == -EMSGSIZE);
3787                 kfree_skb(skb);
3788                 goto errout;
3789         }
3790         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3791 errout:
3792         if (err < 0)
3793                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3794 }
3795
3796 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3797 {
3798         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3799
3800         switch (event) {
3801         case RTM_NEWADDR:
3802                 /*
3803                  * If the address was optimistic
3804                  * we inserted the route at the start of
3805                  * our DAD process, so we don't need
3806                  * to do it again
3807                  */
3808                 if (!(ifp->rt->rt6i_node))
3809                         ip6_ins_rt(ifp->rt);
3810                 if (ifp->idev->cnf.forwarding)
3811                         addrconf_join_anycast(ifp);
3812                 break;
3813         case RTM_DELADDR:
3814                 if (ifp->idev->cnf.forwarding)
3815                         addrconf_leave_anycast(ifp);
3816                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3817                 dst_hold(&ifp->rt->u.dst);
3818                 if (ip6_del_rt(ifp->rt))
3819                         dst_free(&ifp->rt->u.dst);
3820                 break;
3821         }
3822 }
3823
3824 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3825 {
3826         rcu_read_lock_bh();
3827         if (likely(ifp->idev->dead == 0))
3828                 __ipv6_ifa_notify(event, ifp);
3829         rcu_read_unlock_bh();
3830 }
3831
3832 #ifdef CONFIG_SYSCTL
3833
3834 static
3835 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3836                            void __user *buffer, size_t *lenp, loff_t *ppos)
3837 {
3838         int *valp = ctl->data;
3839         int val = *valp;
3840         int ret;
3841
3842         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3843
3844         if (write)
3845                 addrconf_fixup_forwarding(ctl, valp, val);
3846         return ret;
3847 }
3848
3849 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3850                                             int __user *name, int nlen,
3851                                             void __user *oldval,
3852                                             size_t __user *oldlenp,
3853                                             void __user *newval, size_t newlen)
3854 {
3855         int *valp = table->data;
3856         int val = *valp;
3857         int new;
3858
3859         if (!newval || !newlen)
3860                 return 0;
3861         if (newlen != sizeof(int))
3862                 return -EINVAL;
3863         if (get_user(new, (int __user *)newval))
3864                 return -EFAULT;
3865         if (new == *valp)
3866                 return 0;
3867         if (oldval && oldlenp) {
3868                 size_t len;
3869                 if (get_user(len, oldlenp))
3870                         return -EFAULT;
3871                 if (len) {
3872                         if (len > table->maxlen)
3873                                 len = table->maxlen;
3874                         if (copy_to_user(oldval, valp, len))
3875                                 return -EFAULT;
3876                         if (put_user(len, oldlenp))
3877                                 return -EFAULT;
3878                 }
3879         }
3880
3881         *valp = new;
3882         addrconf_fixup_forwarding(table, valp, val);
3883         return 1;
3884 }
3885
3886 static struct addrconf_sysctl_table
3887 {
3888         struct ctl_table_header *sysctl_header;
3889         ctl_table addrconf_vars[__NET_IPV6_MAX];
3890         char *dev_name;
3891 } addrconf_sysctl __read_mostly = {
3892         .sysctl_header = NULL,
3893         .addrconf_vars = {
3894                 {
3895                         .ctl_name       =       NET_IPV6_FORWARDING,
3896                         .procname       =       "forwarding",
3897                         .data           =       &ipv6_devconf.forwarding,
3898                         .maxlen         =       sizeof(int),
3899                         .mode           =       0644,
3900                         .proc_handler   =       &addrconf_sysctl_forward,
3901                         .strategy       =       &addrconf_sysctl_forward_strategy,
3902                 },
3903                 {
3904                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3905                         .procname       =       "hop_limit",
3906                         .data           =       &ipv6_devconf.hop_limit,
3907                         .maxlen         =       sizeof(int),
3908                         .mode           =       0644,
3909                         .proc_handler   =       proc_dointvec,
3910                 },
3911                 {
3912                         .ctl_name       =       NET_IPV6_MTU,
3913                         .procname       =       "mtu",
3914                         .data           =       &ipv6_devconf.mtu6,
3915                         .maxlen         =       sizeof(int),
3916                         .mode           =       0644,
3917                         .proc_handler   =       &proc_dointvec,
3918                 },
3919                 {
3920                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3921                         .procname       =       "accept_ra",
3922                         .data           =       &ipv6_devconf.accept_ra,
3923                         .maxlen         =       sizeof(int),
3924                         .mode           =       0644,
3925                         .proc_handler   =       &proc_dointvec,
3926                 },
3927                 {
3928                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3929                         .procname       =       "accept_redirects",
3930                         .data           =       &ipv6_devconf.accept_redirects,
3931                         .maxlen         =       sizeof(int),
3932                         .mode           =       0644,
3933                         .proc_handler   =       &proc_dointvec,
3934                 },
3935                 {
3936                         .ctl_name       =       NET_IPV6_AUTOCONF,
3937                         .procname       =       "autoconf",
3938                         .data           =       &ipv6_devconf.autoconf,
3939                         .maxlen         =       sizeof(int),
3940                         .mode           =       0644,
3941                         .proc_handler   =       &proc_dointvec,
3942                 },
3943                 {
3944                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3945                         .procname       =       "dad_transmits",
3946                         .data           =       &ipv6_devconf.dad_transmits,
3947                         .maxlen         =       sizeof(int),
3948                         .mode           =       0644,
3949                         .proc_handler   =       &proc_dointvec,
3950                 },
3951                 {
3952                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3953                         .procname       =       "router_solicitations",
3954                         .data           =       &ipv6_devconf.rtr_solicits,
3955                         .maxlen         =       sizeof(int),
3956                         .mode           =       0644,
3957                         .proc_handler   =       &proc_dointvec,
3958                 },
3959                 {
3960                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3961                         .procname       =       "router_solicitation_interval",
3962                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3963                         .maxlen         =       sizeof(int),
3964                         .mode           =       0644,
3965                         .proc_handler   =       &proc_dointvec_jiffies,
3966                         .strategy       =       &sysctl_jiffies,
3967                 },
3968                 {
3969                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3970                         .procname       =       "router_solicitation_delay",
3971                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3972                         .maxlen         =       sizeof(int),
3973                         .mode           =       0644,
3974                         .proc_handler   =       &proc_dointvec_jiffies,
3975                         .strategy       =       &sysctl_jiffies,
3976                 },
3977                 {
3978                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3979                         .procname       =       "force_mld_version",
3980                         .data           =       &ipv6_devconf.force_mld_version,
3981                         .maxlen         =       sizeof(int),
3982                         .mode           =       0644,
3983                         .proc_handler   =       &proc_dointvec,
3984                 },
3985 #ifdef CONFIG_IPV6_PRIVACY
3986                 {
3987                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3988                         .procname       =       "use_tempaddr",
3989                         .data           =       &ipv6_devconf.use_tempaddr,
3990                         .maxlen         =       sizeof(int),
3991                         .mode           =       0644,
3992                         .proc_handler   =       &proc_dointvec,
3993                 },
3994                 {
3995                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3996                         .procname       =       "temp_valid_lft",
3997                         .data           =       &ipv6_devconf.temp_valid_lft,
3998                         .maxlen         =       sizeof(int),
3999                         .mode           =       0644,
4000                         .proc_handler   =       &proc_dointvec,
4001                 },
4002                 {
4003                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4004                         .procname       =       "temp_prefered_lft",
4005                         .data           =       &ipv6_devconf.temp_prefered_lft,
4006                         .maxlen         =       sizeof(int),
4007                         .mode           =       0644,
4008                         .proc_handler   =       &proc_dointvec,
4009                 },
4010                 {
4011                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4012                         .procname       =       "regen_max_retry",
4013                         .data           =       &ipv6_devconf.regen_max_retry,
4014                         .maxlen         =       sizeof(int),
4015                         .mode           =       0644,
4016                         .proc_handler   =       &proc_dointvec,
4017                 },
4018                 {
4019                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4020                         .procname       =       "max_desync_factor",
4021                         .data           =       &ipv6_devconf.max_desync_factor,
4022                         .maxlen         =       sizeof(int),
4023                         .mode           =       0644,
4024                         .proc_handler   =       &proc_dointvec,
4025                 },
4026 #endif
4027                 {
4028                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4029                         .procname       =       "max_addresses",
4030                         .data           =       &ipv6_devconf.max_addresses,
4031                         .maxlen         =       sizeof(int),
4032                         .mode           =       0644,
4033                         .proc_handler   =       &proc_dointvec,
4034                 },
4035                 {
4036                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4037                         .procname       =       "accept_ra_defrtr",
4038                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4039                         .maxlen         =       sizeof(int),
4040                         .mode           =       0644,
4041                         .proc_handler   =       &proc_dointvec,
4042                 },
4043                 {
4044                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4045                         .procname       =       "accept_ra_pinfo",
4046                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4047                         .maxlen         =       sizeof(int),
4048                         .mode           =       0644,
4049                         .proc_handler   =       &proc_dointvec,
4050                 },
4051 #ifdef CONFIG_IPV6_ROUTER_PREF
4052                 {
4053                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4054                         .procname       =       "accept_ra_rtr_pref",
4055                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4056                         .maxlen         =       sizeof(int),
4057                         .mode           =       0644,
4058                         .proc_handler   =       &proc_dointvec,
4059                 },
4060                 {
4061                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4062                         .procname       =       "router_probe_interval",
4063                         .data           =       &ipv6_devconf.rtr_probe_interval,
4064                         .maxlen         =       sizeof(int),
4065                         .mode           =       0644,
4066                         .proc_handler   =       &proc_dointvec_jiffies,
4067                         .strategy       =       &sysctl_jiffies,
4068                 },
4069 #ifdef CONFIG_IPV6_ROUTE_INFO
4070                 {
4071                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4072                         .procname       =       "accept_ra_rt_info_max_plen",
4073                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4074                         .maxlen         =       sizeof(int),
4075                         .mode           =       0644,
4076                         .proc_handler   =       &proc_dointvec,
4077                 },
4078 #endif
4079 #endif
4080                 {
4081                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4082                         .procname       =       "proxy_ndp",
4083                         .data           =       &ipv6_devconf.proxy_ndp,
4084                         .maxlen         =       sizeof(int),
4085                         .mode           =       0644,
4086                         .proc_handler   =       &proc_dointvec,
4087                 },
4088                 {
4089                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4090                         .procname       =       "accept_source_route",
4091                         .data           =       &ipv6_devconf.accept_source_route,
4092                         .maxlen         =       sizeof(int),
4093                         .mode           =       0644,
4094                         .proc_handler   =       &proc_dointvec,
4095                 },
4096 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4097                 {
4098                         .ctl_name       =       CTL_UNNUMBERED,
4099                         .procname       =       "optimistic_dad",
4100                         .data           =       &ipv6_devconf.optimistic_dad,
4101                         .maxlen         =       sizeof(int),
4102                         .mode           =       0644,
4103                         .proc_handler   =       &proc_dointvec,
4104
4105                 },
4106 #endif
4107                 {
4108                         .ctl_name       =       0,      /* sentinel */
4109                 }
4110         },
4111 };
4112
4113 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4114                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4115 {
4116         int i;
4117         struct addrconf_sysctl_table *t;
4118
4119 #define ADDRCONF_CTL_PATH_DEV   3
4120
4121         struct ctl_path addrconf_ctl_path[] = {
4122                 { .procname = "net", .ctl_name = CTL_NET, },
4123                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4124                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4125                 { /* to be set */ },
4126                 { },
4127         };
4128
4129
4130         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4131         if (t == NULL)
4132                 goto out;
4133
4134         for (i=0; t->addrconf_vars[i].data; i++) {
4135                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4136                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4137                 t->addrconf_vars[i].extra2 = net;
4138         }
4139
4140         /*
4141          * Make a copy of dev_name, because '.procname' is regarded as const
4142          * by sysctl and we wouldn't want anyone to change it under our feet
4143          * (see SIOCSIFNAME).
4144          */
4145         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4146         if (!t->dev_name)
4147                 goto free;
4148
4149         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4150         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4151
4152         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4153                         t->addrconf_vars);
4154         if (t->sysctl_header == NULL)
4155                 goto free_procname;
4156
4157         p->sysctl = t;
4158         return 0;
4159
4160 free_procname:
4161         kfree(t->dev_name);
4162 free:
4163         kfree(t);
4164 out:
4165         return -ENOBUFS;
4166 }
4167
4168 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4169 {
4170         struct addrconf_sysctl_table *t;
4171
4172         if (p->sysctl == NULL)
4173                 return;
4174
4175         t = p->sysctl;
4176         p->sysctl = NULL;
4177         unregister_sysctl_table(t->sysctl_header);
4178         kfree(t->dev_name);
4179         kfree(t);
4180 }
4181
4182 static void addrconf_sysctl_register(struct inet6_dev *idev)
4183 {
4184         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4185                               NET_IPV6_NEIGH, "ipv6",
4186                               &ndisc_ifinfo_sysctl_change,
4187                               NULL);
4188         __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4189                         idev->dev->ifindex, idev, &idev->cnf);
4190 }
4191
4192 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4193 {
4194         __addrconf_sysctl_unregister(&idev->cnf);
4195         neigh_sysctl_unregister(idev->nd_parms);
4196 }
4197
4198
4199 #endif
4200
4201 static int addrconf_init_net(struct net *net)
4202 {
4203         int err;
4204         struct ipv6_devconf *all, *dflt;
4205
4206         err = -ENOMEM;
4207         all = &ipv6_devconf;
4208         dflt = &ipv6_devconf_dflt;
4209
4210         if (net != &init_net) {
4211                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4212                 if (all == NULL)
4213                         goto err_alloc_all;
4214
4215                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4216                 if (dflt == NULL)
4217                         goto err_alloc_dflt;
4218         }
4219
4220         net->ipv6.devconf_all = all;
4221         net->ipv6.devconf_dflt = dflt;
4222
4223 #ifdef CONFIG_SYSCTL
4224         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4225                         NULL, all);
4226         if (err < 0)
4227                 goto err_reg_all;
4228
4229         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4230                         NULL, dflt);
4231         if (err < 0)
4232                 goto err_reg_dflt;
4233 #endif
4234         return 0;
4235
4236 #ifdef CONFIG_SYSCTL
4237 err_reg_dflt:
4238         __addrconf_sysctl_unregister(all);
4239 err_reg_all:
4240         kfree(dflt);
4241 #endif
4242 err_alloc_dflt:
4243         kfree(all);
4244 err_alloc_all:
4245         return err;
4246 }
4247
4248 static void addrconf_exit_net(struct net *net)
4249 {
4250 #ifdef CONFIG_SYSCTL
4251         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4252         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4253 #endif
4254         if (net != &init_net) {
4255                 kfree(net->ipv6.devconf_dflt);
4256                 kfree(net->ipv6.devconf_all);
4257         }
4258 }
4259
4260 static struct pernet_operations addrconf_ops = {
4261         .init = addrconf_init_net,
4262         .exit = addrconf_exit_net,
4263 };
4264
4265 /*
4266  *      Device notifier
4267  */
4268
4269 int register_inet6addr_notifier(struct notifier_block *nb)
4270 {
4271         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4272 }
4273
4274 EXPORT_SYMBOL(register_inet6addr_notifier);
4275
4276 int unregister_inet6addr_notifier(struct notifier_block *nb)
4277 {
4278         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4279 }
4280
4281 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4282
4283 /*
4284  *      Init / cleanup code
4285  */
4286
4287 int __init addrconf_init(void)
4288 {
4289         int err;
4290
4291         if ((err = ipv6_addr_label_init()) < 0) {
4292                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4293                         err);
4294                 return err;
4295         }
4296
4297         register_pernet_subsys(&addrconf_ops);
4298
4299         /* The addrconf netdev notifier requires that loopback_dev
4300          * has it's ipv6 private information allocated and setup
4301          * before it can bring up and give link-local addresses
4302          * to other devices which are up.
4303          *
4304          * Unfortunately, loopback_dev is not necessarily the first
4305          * entry in the global dev_base list of net devices.  In fact,
4306          * it is likely to be the very last entry on that list.
4307          * So this causes the notifier registry below to try and
4308          * give link-local addresses to all devices besides loopback_dev
4309          * first, then loopback_dev, which cases all the non-loopback_dev
4310          * devices to fail to get a link-local address.
4311          *
4312          * So, as a temporary fix, allocate the ipv6 structure for
4313          * loopback_dev first by hand.
4314          * Longer term, all of the dependencies ipv6 has upon the loopback
4315          * device and it being up should be removed.
4316          */
4317         rtnl_lock();
4318         if (!ipv6_add_dev(init_net.loopback_dev))
4319                 err = -ENOMEM;
4320         rtnl_unlock();
4321         if (err)
4322                 goto errlo;
4323
4324         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4325         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4326 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4327         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4328         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4329         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4330         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4331 #endif
4332
4333         register_netdevice_notifier(&ipv6_dev_notf);
4334
4335         addrconf_verify(0);
4336
4337         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4338         if (err < 0)
4339                 goto errout;
4340
4341         /* Only the first call to __rtnl_register can fail */
4342         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4343         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4344         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4345         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4346         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4347
4348         ipv6_addr_label_rtnl_register();
4349
4350         return 0;
4351 errout:
4352         unregister_netdevice_notifier(&ipv6_dev_notf);
4353 errlo:
4354         unregister_pernet_subsys(&addrconf_ops);
4355
4356         return err;
4357 }
4358
4359 void addrconf_cleanup(void)
4360 {
4361         struct net_device *dev;
4362         struct inet6_ifaddr *ifa;
4363         int i;
4364
4365         unregister_netdevice_notifier(&ipv6_dev_notf);
4366
4367         unregister_pernet_subsys(&addrconf_ops);
4368
4369         rtnl_lock();
4370
4371         /*
4372          *      clean dev list.
4373          */
4374
4375         for_each_netdev(&init_net, dev) {
4376                 if (__in6_dev_get(dev) == NULL)
4377                         continue;
4378                 addrconf_ifdown(dev, 1);
4379         }
4380         addrconf_ifdown(init_net.loopback_dev, 2);
4381
4382         /*
4383          *      Check hash table.
4384          */
4385
4386         write_lock_bh(&addrconf_hash_lock);
4387         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4388                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4389                         struct inet6_ifaddr *bifa;
4390
4391                         bifa = ifa;
4392                         ifa = ifa->lst_next;
4393                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4394                         /* Do not free it; something is wrong.
4395                            Now we can investigate it with debugger.
4396                          */
4397                 }
4398         }
4399         write_unlock_bh(&addrconf_hash_lock);
4400
4401         del_timer(&addr_chk_timer);
4402
4403         rtnl_unlock();
4404 }