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/sched.h>
  48 #include <linux/net.h>
  49 #include <linux/in6.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/if_addr.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #ifdef CONFIG_SYSCTL
  59 #include <linux/sysctl.h>
  60 #endif
  61 #include <linux/capability.h>
  62 #include <linux/delay.h>
  63 #include <linux/notifier.h>
  64 #include <linux/string.h>
  65
  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 <linux/if_tunnel.h>
  77 #include <linux/rtnetlink.h>
  78
  79 #ifdef CONFIG_IPV6_PRIVACY
  80 #include <linux/random.h>
  81 #endif
  82
  83 #include <asm/uaccess.h>
  84
  85 #include <linux/proc_fs.h>
  86 #include <linux/seq_file.h>
  87
  88 /* Set to 3 to get tracing... */
  89 #define ACONF_DEBUG 2
  90
  91 #if ACONF_DEBUG >= 3
  92 #define ADBG(x) printk x
  93 #else
  94 #define ADBG(x)
  95 #endif
  96
  97 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  99
 100 #ifdef CONFIG_SYSCTL
 101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 103 #endif
 104
 105 #ifdef CONFIG_IPV6_PRIVACY
 106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 108 static void ipv6_regen_rndid(unsigned long data);
 109
 110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 111 #endif
 112
 113 static int ipv6_count_addresses(struct inet6_dev *idev);
 114
 115 /*
 116  *      Configured unicast address hash table
 117  */
 118 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 119 static DEFINE_RWLOCK(addrconf_hash_lock);
 120
 121 /* Protects inet6 devices */
 122 DEFINE_RWLOCK(addrconf_lock);
 123
 124 static void addrconf_verify(unsigned long);
 125
 126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 127 static DEFINE_SPINLOCK(addrconf_verify_lock);
 128
 129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 131
 132 static int addrconf_ifdown(struct net_device *dev, int how);
 133
 134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 135 static void addrconf_dad_timer(unsigned long data);
 136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 137 static void addrconf_dad_run(struct inet6_dev *idev);
 138 static void addrconf_rs_timer(unsigned long data);
 139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 141
 142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 143                                 struct prefix_info *pinfo);
 144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 145
 146 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 147
 148 struct ipv6_devconf ipv6_devconf = {
 149         .forwarding             = 0,
 150         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 151         .mtu6                   = IPV6_MIN_MTU,
 152         .accept_ra              = 1,
 153         .accept_redirects       = 1,
 154         .autoconf               = 1,
 155         .force_mld_version      = 0,
 156         .dad_transmits          = 1,
 157         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 158         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 159         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 160 #ifdef CONFIG_IPV6_PRIVACY
 161         .use_tempaddr           = 0,
 162         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 163         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 164         .regen_max_retry        = REGEN_MAX_RETRY,
 165         .max_desync_factor      = MAX_DESYNC_FACTOR,
 166 #endif
 167         .max_addresses          = IPV6_MAX_ADDRESSES,
 168         .accept_ra_defrtr       = 1,
 169         .accept_ra_pinfo        = 1,
 170 #ifdef CONFIG_IPV6_ROUTER_PREF
 171         .accept_ra_rtr_pref     = 1,
 172         .rtr_probe_interval     = 60 * HZ,
 173 #ifdef CONFIG_IPV6_ROUTE_INFO
 174         .accept_ra_rt_info_max_plen = 0,
 175 #endif
 176 #endif
 177 };
 178
 179 static struct ipv6_devconf ipv6_devconf_dflt = {
 180         .forwarding             = 0,
 181         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 182         .mtu6                   = IPV6_MIN_MTU,
 183         .accept_ra              = 1,
 184         .accept_redirects       = 1,
 185         .autoconf               = 1,
 186         .dad_transmits          = 1,
 187         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 188         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 189         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 190 #ifdef CONFIG_IPV6_PRIVACY
 191         .use_tempaddr           = 0,
 192         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 193         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 194         .regen_max_retry        = REGEN_MAX_RETRY,
 195         .max_desync_factor      = MAX_DESYNC_FACTOR,
 196 #endif
 197         .max_addresses          = IPV6_MAX_ADDRESSES,
 198         .accept_ra_defrtr       = 1,
 199         .accept_ra_pinfo        = 1,
 200 #ifdef CONFIG_IPV6_ROUTER_PREF
 201         .accept_ra_rtr_pref     = 1,
 202         .rtr_probe_interval     = 60 * HZ,
 203 #ifdef CONFIG_IPV6_ROUTE_INFO
 204         .accept_ra_rt_info_max_plen = 0,
 205 #endif
 206 #endif
 207 };
 208
 209 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 210 #if 0
 211 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 212 #endif
 213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 214
 215 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 216
 217 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 218 {
 219         switch(scope) {
 220         case IPV6_ADDR_SCOPE_NODELOCAL:
 221                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 222                         IPV6_ADDR_LOOPBACK);
 223         case IPV6_ADDR_SCOPE_LINKLOCAL:
 224                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 225                         IPV6_ADDR_LINKLOCAL);
 226         case IPV6_ADDR_SCOPE_SITELOCAL:
 227                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 228                         IPV6_ADDR_SITELOCAL);
 229         }
 230         return IPV6_ADDR_SCOPE_TYPE(scope);
 231 }
 232
 233 int __ipv6_addr_type(const struct in6_addr *addr)
 234 {
 235         u32 st;
 236
 237         st = addr->s6_addr32[0];
 238
 239         /* Consider all addresses with the first three bits different of
 240            000 and 111 as unicasts.
 241          */
 242         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 243             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 244                 return (IPV6_ADDR_UNICAST |
 245                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 246
 247         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 248                 /* multicast */
 249                 /* addr-select 3.1 */
 250                 return (IPV6_ADDR_MULTICAST |
 251                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 252         }
 253
 254         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 255                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 256                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 257         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 258                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 259                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 260
 261         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 262                 if (addr->s6_addr32[2] == 0) {
 263                         if (addr->s6_addr32[3] == 0)
 264                                 return IPV6_ADDR_ANY;
 265
 266                         if (addr->s6_addr32[3] == htonl(0x00000001))
 267                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 268                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 269
 270                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 271                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 272                 }
 273
 274                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 275                         return (IPV6_ADDR_MAPPED |
 276                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 277         }
 278
 279         return (IPV6_ADDR_RESERVED |
 280                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 281 }
 282
 283 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 284 {
 285         if (del_timer(&ifp->timer))
 286                 __in6_ifa_put(ifp);
 287 }
 288
 289 enum addrconf_timer_t
 290 {
 291         AC_NONE,
 292         AC_DAD,
 293         AC_RS,
 294 };
 295
 296 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 297                                enum addrconf_timer_t what,
 298                                unsigned long when)
 299 {
 300         if (!del_timer(&ifp->timer))
 301                 in6_ifa_hold(ifp);
 302
 303         switch (what) {
 304         case AC_DAD:
 305                 ifp->timer.function = addrconf_dad_timer;
 306                 break;
 307         case AC_RS:
 308                 ifp->timer.function = addrconf_rs_timer;
 309                 break;
 310         default:;
 311         }
 312         ifp->timer.expires = jiffies + when;
 313         add_timer(&ifp->timer);
 314 }
 315
 316 /* Nobody refers to this device, we may destroy it. */
 317
 318 void in6_dev_finish_destroy(struct inet6_dev *idev)
 319 {
 320         struct net_device *dev = idev->dev;
 321         BUG_TRAP(idev->addr_list==NULL);
 322         BUG_TRAP(idev->mc_list==NULL);
 323 #ifdef NET_REFCNT_DEBUG
 324         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 325 #endif
 326         dev_put(dev);
 327         if (!idev->dead) {
 328                 printk("Freeing alive inet6 device %p\n", idev);
 329                 return;
 330         }
 331         snmp6_free_dev(idev);
 332         kfree(idev);
 333 }
 334
 335 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 336 {
 337         struct inet6_dev *ndev;
 338
 339         ASSERT_RTNL();
 340
 341         if (dev->mtu < IPV6_MIN_MTU)
 342                 return NULL;
 343
 344         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 345
 346         if (ndev == NULL)
 347                 return NULL;
 348
 349         rwlock_init(&ndev->lock);
 350         ndev->dev = dev;
 351         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 352         ndev->cnf.mtu6 = dev->mtu;
 353         ndev->cnf.sysctl = NULL;
 354         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 355         if (ndev->nd_parms == NULL) {
 356                 kfree(ndev);
 357                 return NULL;
 358         }
 359         /* We refer to the device */
 360         dev_hold(dev);
 361
 362         if (snmp6_alloc_dev(ndev) < 0) {
 363                 ADBG((KERN_WARNING
 364                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 365                         __FUNCTION__, dev->name));
 366                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 367                 ndev->dead = 1;
 368                 in6_dev_finish_destroy(ndev);
 369                 return NULL;
 370         }
 371
 372         if (snmp6_register_dev(ndev) < 0) {
 373                 ADBG((KERN_WARNING
 374                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 375                         __FUNCTION__, dev->name));
 376                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 377                 ndev->dead = 1;
 378                 in6_dev_finish_destroy(ndev);
 379                 return NULL;
 380         }
 381
 382         /* One reference from device.  We must do this before
 383          * we invoke __ipv6_regen_rndid().
 384          */
 385         in6_dev_hold(ndev);
 386
 387 #ifdef CONFIG_IPV6_PRIVACY
 388         init_timer(&ndev->regen_timer);
 389         ndev->regen_timer.function = ipv6_regen_rndid;
 390         ndev->regen_timer.data = (unsigned long) ndev;
 391         if ((dev->flags&IFF_LOOPBACK) ||
 392             dev->type == ARPHRD_TUNNEL ||
 393             dev->type == ARPHRD_NONE ||
 394             dev->type == ARPHRD_SIT) {
 395                 printk(KERN_INFO
 396                        "%s: Disabled Privacy Extensions\n",
 397                        dev->name);
 398                 ndev->cnf.use_tempaddr = -1;
 399         } else {
 400                 in6_dev_hold(ndev);
 401                 ipv6_regen_rndid((unsigned long) ndev);
 402         }
 403 #endif
 404
 405         if (netif_carrier_ok(dev))
 406                 ndev->if_flags |= IF_READY;
 407
 408         write_lock_bh(&addrconf_lock);
 409         dev->ip6_ptr = ndev;
 410         write_unlock_bh(&addrconf_lock);
 411
 412         ipv6_mc_init_dev(ndev);
 413         ndev->tstamp = jiffies;
 414 #ifdef CONFIG_SYSCTL
 415         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 416                               NET_IPV6_NEIGH, "ipv6",
 417                               &ndisc_ifinfo_sysctl_change,
 418                               NULL);
 419         addrconf_sysctl_register(ndev, &ndev->cnf);
 420 #endif
 421         return ndev;
 422 }
 423
 424 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 425 {
 426         struct inet6_dev *idev;
 427
 428         ASSERT_RTNL();
 429
 430         if ((idev = __in6_dev_get(dev)) == NULL) {
 431                 if ((idev = ipv6_add_dev(dev)) == NULL)
 432                         return NULL;
 433         }
 434
 435         if (dev->flags&IFF_UP)
 436                 ipv6_mc_up(idev);
 437         return idev;
 438 }
 439
 440 #ifdef CONFIG_SYSCTL
 441 static void dev_forward_change(struct inet6_dev *idev)
 442 {
 443         struct net_device *dev;
 444         struct inet6_ifaddr *ifa;
 445         struct in6_addr addr;
 446
 447         if (!idev)
 448                 return;
 449         dev = idev->dev;
 450         if (dev && (dev->flags & IFF_MULTICAST)) {
 451                 ipv6_addr_all_routers(&addr);
 452
 453                 if (idev->cnf.forwarding)
 454                         ipv6_dev_mc_inc(dev, &addr);
 455                 else
 456                         ipv6_dev_mc_dec(dev, &addr);
 457         }
 458         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 459                 if (idev->cnf.forwarding)
 460                         addrconf_join_anycast(ifa);
 461                 else
 462                         addrconf_leave_anycast(ifa);
 463         }
 464 }
 465
 466
 467 static void addrconf_forward_change(void)
 468 {
 469         struct net_device *dev;
 470         struct inet6_dev *idev;
 471
 472         read_lock(&dev_base_lock);
 473         for (dev=dev_base; dev; dev=dev->next) {
 474                 read_lock(&addrconf_lock);
 475                 idev = __in6_dev_get(dev);
 476                 if (idev) {
 477                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 478                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 479                         if (changed)
 480                                 dev_forward_change(idev);
 481                 }
 482                 read_unlock(&addrconf_lock);
 483         }
 484         read_unlock(&dev_base_lock);
 485 }
 486 #endif
 487
 488 /* Nobody refers to this ifaddr, destroy it */
 489
 490 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 491 {
 492         BUG_TRAP(ifp->if_next==NULL);
 493         BUG_TRAP(ifp->lst_next==NULL);
 494 #ifdef NET_REFCNT_DEBUG
 495         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 496 #endif
 497
 498         in6_dev_put(ifp->idev);
 499
 500         if (del_timer(&ifp->timer))
 501                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 502
 503         if (!ifp->dead) {
 504                 printk("Freeing alive inet6 address %p\n", ifp);
 505                 return;
 506         }
 507         dst_release(&ifp->rt->u.dst);
 508
 509         kfree(ifp);
 510 }
 511
 512 static void
 513 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 514 {
 515         struct inet6_ifaddr *ifa, **ifap;
 516         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 517
 518         /*
 519          * Each device address list is sorted in order of scope -
 520          * global before linklocal.
 521          */
 522         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 523              ifap = &ifa->if_next) {
 524                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 525                         break;
 526         }
 527
 528         ifp->if_next = *ifap;
 529         *ifap = ifp;
 530 }
 531
 532 /* On success it returns ifp with increased reference count */
 533
 534 static struct inet6_ifaddr *
 535 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 536               int scope, u32 flags)
 537 {
 538         struct inet6_ifaddr *ifa = NULL;
 539         struct rt6_info *rt;
 540         int hash;
 541         int err = 0;
 542
 543         read_lock_bh(&addrconf_lock);
 544         if (idev->dead) {
 545                 err = -ENODEV;                  /*XXX*/
 546                 goto out2;
 547         }
 548
 549         write_lock(&addrconf_hash_lock);
 550
 551         /* Ignore adding duplicate addresses on an interface */
 552         if (ipv6_chk_same_addr(addr, idev->dev)) {
 553                 ADBG(("ipv6_add_addr: already assigned\n"));
 554                 err = -EEXIST;
 555                 goto out;
 556         }
 557
 558         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 559
 560         if (ifa == NULL) {
 561                 ADBG(("ipv6_add_addr: malloc failed\n"));
 562                 err = -ENOBUFS;
 563                 goto out;
 564         }
 565
 566         rt = addrconf_dst_alloc(idev, addr, 0);
 567         if (IS_ERR(rt)) {
 568                 err = PTR_ERR(rt);
 569                 goto out;
 570         }
 571
 572         ipv6_addr_copy(&ifa->addr, addr);
 573
 574         spin_lock_init(&ifa->lock);
 575         init_timer(&ifa->timer);
 576         ifa->timer.data = (unsigned long) ifa;
 577         ifa->scope = scope;
 578         ifa->prefix_len = pfxlen;
 579         ifa->flags = flags | IFA_F_TENTATIVE;
 580         ifa->cstamp = ifa->tstamp = jiffies;
 581
 582         ifa->rt = rt;
 583
 584         ifa->idev = idev;
 585         in6_dev_hold(idev);
 586         /* For caller */
 587         in6_ifa_hold(ifa);
 588
 589         /* Add to big hash table */
 590         hash = ipv6_addr_hash(addr);
 591
 592         ifa->lst_next = inet6_addr_lst[hash];
 593         inet6_addr_lst[hash] = ifa;
 594         in6_ifa_hold(ifa);
 595         write_unlock(&addrconf_hash_lock);
 596
 597         write_lock(&idev->lock);
 598         /* Add to inet6_dev unicast addr list. */
 599         ipv6_link_dev_addr(idev, ifa);
 600
 601 #ifdef CONFIG_IPV6_PRIVACY
 602         if (ifa->flags&IFA_F_TEMPORARY) {
 603                 ifa->tmp_next = idev->tempaddr_list;
 604                 idev->tempaddr_list = ifa;
 605                 in6_ifa_hold(ifa);
 606         }
 607 #endif
 608
 609         in6_ifa_hold(ifa);
 610         write_unlock(&idev->lock);
 611 out2:
 612         read_unlock_bh(&addrconf_lock);
 613
 614         if (likely(err == 0))
 615                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 616         else {
 617                 kfree(ifa);
 618                 ifa = ERR_PTR(err);
 619         }
 620
 621         return ifa;
 622 out:
 623         write_unlock(&addrconf_hash_lock);
 624         goto out2;
 625 }
 626
 627 /* This function wants to get referenced ifp and releases it before return */
 628
 629 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 630 {
 631         struct inet6_ifaddr *ifa, **ifap;
 632         struct inet6_dev *idev = ifp->idev;
 633         int hash;
 634         int deleted = 0, onlink = 0;
 635         unsigned long expires = jiffies;
 636
 637         hash = ipv6_addr_hash(&ifp->addr);
 638
 639         ifp->dead = 1;
 640
 641         write_lock_bh(&addrconf_hash_lock);
 642         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 643              ifap = &ifa->lst_next) {
 644                 if (ifa == ifp) {
 645                         *ifap = ifa->lst_next;
 646                         __in6_ifa_put(ifp);
 647                         ifa->lst_next = NULL;
 648                         break;
 649                 }
 650         }
 651         write_unlock_bh(&addrconf_hash_lock);
 652
 653         write_lock_bh(&idev->lock);
 654 #ifdef CONFIG_IPV6_PRIVACY
 655         if (ifp->flags&IFA_F_TEMPORARY) {
 656                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 657                      ifap = &ifa->tmp_next) {
 658                         if (ifa == ifp) {
 659                                 *ifap = ifa->tmp_next;
 660                                 if (ifp->ifpub) {
 661                                         in6_ifa_put(ifp->ifpub);
 662                                         ifp->ifpub = NULL;
 663                                 }
 664                                 __in6_ifa_put(ifp);
 665                                 ifa->tmp_next = NULL;
 666                                 break;
 667                         }
 668                 }
 669         }
 670 #endif
 671
 672         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 673                 if (ifa == ifp) {
 674                         *ifap = ifa->if_next;
 675                         __in6_ifa_put(ifp);
 676                         ifa->if_next = NULL;
 677                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 678                                 break;
 679                         deleted = 1;
 680                         continue;
 681                 } else if (ifp->flags & IFA_F_PERMANENT) {
 682                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 683                                               ifp->prefix_len)) {
 684                                 if (ifa->flags & IFA_F_PERMANENT) {
 685                                         onlink = 1;
 686                                         if (deleted)
 687                                                 break;
 688                                 } else {
 689                                         unsigned long lifetime;
 690
 691                                         if (!onlink)
 692                                                 onlink = -1;
 693
 694                                         spin_lock(&ifa->lock);
 695                                         lifetime = min_t(unsigned long,
 696                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 697                                         if (time_before(expires,
 698                                                         ifa->tstamp + lifetime * HZ))
 699                                                 expires = ifa->tstamp + lifetime * HZ;
 700                                         spin_unlock(&ifa->lock);
 701                                 }
 702                         }
 703                 }
 704                 ifap = &ifa->if_next;
 705         }
 706         write_unlock_bh(&idev->lock);
 707
 708         ipv6_ifa_notify(RTM_DELADDR, ifp);
 709
 710         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 711
 712         addrconf_del_timer(ifp);
 713
 714         /*
 715          * Purge or update corresponding prefix
 716          *
 717          * 1) we don't purge prefix here if address was not permanent.
 718          *    prefix is managed by its own lifetime.
 719          * 2) if there're no addresses, delete prefix.
 720          * 3) if there're still other permanent address(es),
 721          *    corresponding prefix is still permanent.
 722          * 4) otherwise, update prefix lifetime to the
 723          *    longest valid lifetime among the corresponding
 724          *    addresses on the device.
 725          *    Note: subsequent RA will update lifetime.
 726          *
 727          * --yoshfuji
 728          */
 729         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 730                 struct in6_addr prefix;
 731                 struct rt6_info *rt;
 732
 733                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 734                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 735
 736                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 737                         if (onlink == 0) {
 738                                 ip6_del_rt(rt, NULL, NULL, NULL);
 739                                 rt = NULL;
 740                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 741                                 rt->rt6i_expires = expires;
 742                                 rt->rt6i_flags |= RTF_EXPIRES;
 743                         }
 744                 }
 745                 dst_release(&rt->u.dst);
 746         }
 747
 748         in6_ifa_put(ifp);
 749 }
 750
 751 #ifdef CONFIG_IPV6_PRIVACY
 752 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 753 {
 754         struct inet6_dev *idev = ifp->idev;
 755         struct in6_addr addr, *tmpaddr;
 756         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 757         int tmp_plen;
 758         int ret = 0;
 759         int max_addresses;
 760
 761         write_lock(&idev->lock);
 762         if (ift) {
 763                 spin_lock_bh(&ift->lock);
 764                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 765                 spin_unlock_bh(&ift->lock);
 766                 tmpaddr = &addr;
 767         } else {
 768                 tmpaddr = NULL;
 769         }
 770 retry:
 771         in6_dev_hold(idev);
 772         if (idev->cnf.use_tempaddr <= 0) {
 773                 write_unlock(&idev->lock);
 774                 printk(KERN_INFO
 775                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 776                 in6_dev_put(idev);
 777                 ret = -1;
 778                 goto out;
 779         }
 780         spin_lock_bh(&ifp->lock);
 781         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 782                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 783                 spin_unlock_bh(&ifp->lock);
 784                 write_unlock(&idev->lock);
 785                 printk(KERN_WARNING
 786                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 787                 in6_dev_put(idev);
 788                 ret = -1;
 789                 goto out;
 790         }
 791         in6_ifa_hold(ifp);
 792         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 793         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 794                 spin_unlock_bh(&ifp->lock);
 795                 write_unlock(&idev->lock);
 796                 printk(KERN_WARNING
 797                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 798                 in6_ifa_put(ifp);
 799                 in6_dev_put(idev);
 800                 ret = -1;
 801                 goto out;
 802         }
 803         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 804         tmp_valid_lft = min_t(__u32,
 805                               ifp->valid_lft,
 806                               idev->cnf.temp_valid_lft);
 807         tmp_prefered_lft = min_t(__u32,
 808                                  ifp->prefered_lft,
 809                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 810         tmp_plen = ifp->prefix_len;
 811         max_addresses = idev->cnf.max_addresses;
 812         tmp_cstamp = ifp->cstamp;
 813         tmp_tstamp = ifp->tstamp;
 814         spin_unlock_bh(&ifp->lock);
 815
 816         write_unlock(&idev->lock);
 817         ift = !max_addresses ||
 818               ipv6_count_addresses(idev) < max_addresses ?
 819                 ipv6_add_addr(idev, &addr, tmp_plen,
 820                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 821         if (!ift || IS_ERR(ift)) {
 822                 in6_ifa_put(ifp);
 823                 in6_dev_put(idev);
 824                 printk(KERN_INFO
 825                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 826                 tmpaddr = &addr;
 827                 write_lock(&idev->lock);
 828                 goto retry;
 829         }
 830
 831         spin_lock_bh(&ift->lock);
 832         ift->ifpub = ifp;
 833         ift->valid_lft = tmp_valid_lft;
 834         ift->prefered_lft = tmp_prefered_lft;
 835         ift->cstamp = tmp_cstamp;
 836         ift->tstamp = tmp_tstamp;
 837         spin_unlock_bh(&ift->lock);
 838
 839         addrconf_dad_start(ift, 0);
 840         in6_ifa_put(ift);
 841         in6_dev_put(idev);
 842 out:
 843         return ret;
 844 }
 845 #endif
 846
 847 /*
 848  *      Choose an appropriate source address (RFC3484)
 849  */
 850 struct ipv6_saddr_score {
 851         int             addr_type;
 852         unsigned int    attrs;
 853         int             matchlen;
 854         int             scope;
 855         unsigned int    rule;
 856 };
 857
 858 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 859 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 860 #define IPV6_SADDR_SCORE_HOA            0x0008
 861 #define IPV6_SADDR_SCORE_OIF            0x0010
 862 #define IPV6_SADDR_SCORE_LABEL          0x0020
 863 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 864
 865 static int inline ipv6_saddr_preferred(int type)
 866 {
 867         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 868                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 869                 return 1;
 870         return 0;
 871 }
 872
 873 /* static matching label */
 874 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 875 {
 876  /*
 877   *     prefix (longest match)  label
 878   *     -----------------------------
 879   *     ::1/128                 0
 880   *     ::/0                    1
 881   *     2002::/16               2
 882   *     ::/96                   3
 883   *     ::ffff:0:0/96           4
 884   *     fc00::/7                5
 885   *     2001::/32               6
 886   */
 887         if (type & IPV6_ADDR_LOOPBACK)
 888                 return 0;
 889         else if (type & IPV6_ADDR_COMPATv4)
 890                 return 3;
 891         else if (type & IPV6_ADDR_MAPPED)
 892                 return 4;
 893         else if (addr->s6_addr32[0] == htonl(0x20010000))
 894                 return 6;
 895         else if (addr->s6_addr16[0] == htons(0x2002))
 896                 return 2;
 897         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 898                 return 5;
 899         return 1;
 900 }
 901
 902 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 903                        struct in6_addr *daddr, struct in6_addr *saddr)
 904 {
 905         struct ipv6_saddr_score hiscore;
 906         struct inet6_ifaddr *ifa_result = NULL;
 907         int daddr_type = __ipv6_addr_type(daddr);
 908         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 909         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 910         struct net_device *dev;
 911
 912         memset(&hiscore, 0, sizeof(hiscore));
 913
 914         read_lock(&dev_base_lock);
 915         read_lock(&addrconf_lock);
 916
 917         for (dev = dev_base; dev; dev=dev->next) {
 918                 struct inet6_dev *idev;
 919                 struct inet6_ifaddr *ifa;
 920
 921                 /* Rule 0: Candidate Source Address (section 4)
 922                  *  - multicast and link-local destination address,
 923                  *    the set of candidate source address MUST only
 924                  *    include addresses assigned to interfaces
 925                  *    belonging to the same link as the outgoing
 926                  *    interface.
 927                  * (- For site-local destination addresses, the
 928                  *    set of candidate source addresses MUST only
 929                  *    include addresses assigned to interfaces
 930                  *    belonging to the same site as the outgoing
 931                  *    interface.)
 932                  */
 933                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 934                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 935                     daddr_dev && dev != daddr_dev)
 936                         continue;
 937
 938                 idev = __in6_dev_get(dev);
 939                 if (!idev)
 940                         continue;
 941
 942                 read_lock_bh(&idev->lock);
 943                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 944                         struct ipv6_saddr_score score;
 945
 946                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 947
 948                         /* Rule 0:
 949                          * - Tentative Address (RFC2462 section 5.4)
 950                          *  - A tentative address is not considered
 951                          *    "assigned to an interface" in the traditional
 952                          *    sense.
 953                          * - Candidate Source Address (section 4)
 954                          *  - In any case, anycast addresses, multicast
 955                          *    addresses, and the unspecified address MUST
 956                          *    NOT be included in a candidate set.
 957                          */
 958                         if (ifa->flags & IFA_F_TENTATIVE)
 959                                 continue;
 960                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 961                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 962                                 LIMIT_NETDEBUG(KERN_DEBUG
 963                                                "ADDRCONF: unspecified / multicast address"
 964                                                "assigned as unicast address on %s",
 965                                                dev->name);
 966                                 continue;
 967                         }
 968
 969                         score.attrs = 0;
 970                         score.matchlen = 0;
 971                         score.scope = 0;
 972                         score.rule = 0;
 973
 974                         if (ifa_result == NULL) {
 975                                 /* record it if the first available entry */
 976                                 goto record_it;
 977                         }
 978
 979                         /* Rule 1: Prefer same address */
 980                         if (hiscore.rule < 1) {
 981                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 982                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 983                                 hiscore.rule++;
 984                         }
 985                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 986                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 987                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 988                                         score.rule = 1;
 989                                         goto record_it;
 990                                 }
 991                         } else {
 992                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 993                                         continue;
 994                         }
 995
 996                         /* Rule 2: Prefer appropriate scope */
 997                         if (hiscore.rule < 2) {
 998                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 999                                 hiscore.rule++;
1000                         }
1001                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1002                         if (hiscore.scope < score.scope) {
1003                                 if (hiscore.scope < daddr_scope) {
1004                                         score.rule = 2;
1005                                         goto record_it;
1006                                 } else
1007                                         continue;
1008                         } else if (score.scope < hiscore.scope) {
1009                                 if (score.scope < daddr_scope)
1010                                         break; /* addresses sorted by scope */
1011                                 else {
1012                                         score.rule = 2;
1013                                         goto record_it;
1014                                 }
1015                         }
1016
1017                         /* Rule 3: Avoid deprecated address */
1018                         if (hiscore.rule < 3) {
1019                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1020                                     !(ifa_result->flags & IFA_F_DEPRECATED))
1021                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1022                                 hiscore.rule++;
1023                         }
1024                         if (ipv6_saddr_preferred(score.addr_type) ||
1025                             !(ifa->flags & IFA_F_DEPRECATED)) {
1026                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1027                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1028                                         score.rule = 3;
1029                                         goto record_it;
1030                                 }
1031                         } else {
1032                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1033                                         continue;
1034                         }
1035
1036                         /* Rule 4: Prefer home address -- not implemented yet */
1037                         if (hiscore.rule < 4)
1038                                 hiscore.rule++;
1039
1040                         /* Rule 5: Prefer outgoing interface */
1041                         if (hiscore.rule < 5) {
1042                                 if (daddr_dev == NULL ||
1043                                     daddr_dev == ifa_result->idev->dev)
1044                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1045                                 hiscore.rule++;
1046                         }
1047                         if (daddr_dev == NULL ||
1048                             daddr_dev == ifa->idev->dev) {
1049                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1050                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1051                                         score.rule = 5;
1052                                         goto record_it;
1053                                 }
1054                         } else {
1055                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1056                                         continue;
1057                         }
1058
1059                         /* Rule 6: Prefer matching label */
1060                         if (hiscore.rule < 6) {
1061                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1062                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1063                                 hiscore.rule++;
1064                         }
1065                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1066                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1067                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1068                                         score.rule = 6;
1069                                         goto record_it;
1070                                 }
1071                         } else {
1072                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1073                                         continue;
1074                         }
1075
1076 #ifdef CONFIG_IPV6_PRIVACY
1077                         /* Rule 7: Prefer public address
1078                          * Note: prefer temprary address if use_tempaddr >= 2
1079                          */
1080                         if (hiscore.rule < 7) {
1081                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1082                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1083                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1084                                 hiscore.rule++;
1085                         }
1086                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1087                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1088                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1089                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1090                                         score.rule = 7;
1091                                         goto record_it;
1092                                 }
1093                         } else {
1094                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1095                                         continue;
1096                         }
1097 #else
1098                         if (hiscore.rule < 7)
1099                                 hiscore.rule++;
1100 #endif
1101                         /* Rule 8: Use longest matching prefix */
1102                         if (hiscore.rule < 8) {
1103                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1104                                 hiscore.rule++;
1105                         }
1106                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1107                         if (score.matchlen > hiscore.matchlen) {
1108                                 score.rule = 8;
1109                                 goto record_it;
1110                         }
1111 #if 0
1112                         else if (score.matchlen < hiscore.matchlen)
1113                                 continue;
1114 #endif
1115
1116                         /* Final Rule: choose first available one */
1117                         continue;
1118 record_it:
1119                         if (ifa_result)
1120                                 in6_ifa_put(ifa_result);
1121                         in6_ifa_hold(ifa);
1122                         ifa_result = ifa;
1123                         hiscore = score;
1124                 }
1125                 read_unlock_bh(&idev->lock);
1126         }
1127         read_unlock(&addrconf_lock);
1128         read_unlock(&dev_base_lock);
1129
1130         if (!ifa_result)
1131                 return -EADDRNOTAVAIL;
1132
1133         ipv6_addr_copy(saddr, &ifa_result->addr);
1134         in6_ifa_put(ifa_result);
1135         return 0;
1136 }
1137
1138
1139 int ipv6_get_saddr(struct dst_entry *dst,
1140                    struct in6_addr *daddr, struct in6_addr *saddr)
1141 {
1142         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1143 }
1144
1145
1146 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1147 {
1148         struct inet6_dev *idev;
1149         int err = -EADDRNOTAVAIL;
1150
1151         read_lock(&addrconf_lock);
1152         if ((idev = __in6_dev_get(dev)) != NULL) {
1153                 struct inet6_ifaddr *ifp;
1154
1155                 read_lock_bh(&idev->lock);
1156                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1157                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1158                                 ipv6_addr_copy(addr, &ifp->addr);
1159                                 err = 0;
1160                                 break;
1161                         }
1162                 }
1163                 read_unlock_bh(&idev->lock);
1164         }
1165         read_unlock(&addrconf_lock);
1166         return err;
1167 }
1168
1169 static int ipv6_count_addresses(struct inet6_dev *idev)
1170 {
1171         int cnt = 0;
1172         struct inet6_ifaddr *ifp;
1173
1174         read_lock_bh(&idev->lock);
1175         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1176                 cnt++;
1177         read_unlock_bh(&idev->lock);
1178         return cnt;
1179 }
1180
1181 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1182 {
1183         struct inet6_ifaddr * ifp;
1184         u8 hash = ipv6_addr_hash(addr);
1185
1186         read_lock_bh(&addrconf_hash_lock);
1187         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1188                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1189                     !(ifp->flags&IFA_F_TENTATIVE)) {
1190                         if (dev == NULL || ifp->idev->dev == dev ||
1191                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1192                                 break;
1193                 }
1194         }
1195         read_unlock_bh(&addrconf_hash_lock);
1196         return ifp != NULL;
1197 }
1198
1199 static
1200 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1201 {
1202         struct inet6_ifaddr * ifp;
1203         u8 hash = ipv6_addr_hash(addr);
1204
1205         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1206                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1207                         if (dev == NULL || ifp->idev->dev == dev)
1208                                 break;
1209                 }
1210         }
1211         return ifp != NULL;
1212 }
1213
1214 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1215 {
1216         struct inet6_ifaddr * ifp;
1217         u8 hash = ipv6_addr_hash(addr);
1218
1219         read_lock_bh(&addrconf_hash_lock);
1220         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1221                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1222                         if (dev == NULL || ifp->idev->dev == dev ||
1223                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1224                                 in6_ifa_hold(ifp);
1225                                 break;
1226                         }
1227                 }
1228         }
1229         read_unlock_bh(&addrconf_hash_lock);
1230
1231         return ifp;
1232 }
1233
1234 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1235 {
1236         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1237         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1238         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1239         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1240         int sk_ipv6only = ipv6_only_sock(sk);
1241         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1242         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1243         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1244
1245         if (!sk2_rcv_saddr && !sk_ipv6only)
1246                 return 1;
1247
1248         if (addr_type2 == IPV6_ADDR_ANY &&
1249             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1250                 return 1;
1251
1252         if (addr_type == IPV6_ADDR_ANY &&
1253             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1254                 return 1;
1255
1256         if (sk2_rcv_saddr6 &&
1257             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1258                 return 1;
1259
1260         if (addr_type == IPV6_ADDR_MAPPED &&
1261             !sk2_ipv6only &&
1262             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1263                 return 1;
1264
1265         return 0;
1266 }
1267
1268 /* Gets referenced address, destroys ifaddr */
1269
1270 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1271 {
1272         if (ifp->flags&IFA_F_PERMANENT) {
1273                 spin_lock_bh(&ifp->lock);
1274                 addrconf_del_timer(ifp);
1275                 ifp->flags |= IFA_F_TENTATIVE;
1276                 spin_unlock_bh(&ifp->lock);
1277                 in6_ifa_put(ifp);
1278 #ifdef CONFIG_IPV6_PRIVACY
1279         } else if (ifp->flags&IFA_F_TEMPORARY) {
1280                 struct inet6_ifaddr *ifpub;
1281                 spin_lock_bh(&ifp->lock);
1282                 ifpub = ifp->ifpub;
1283                 if (ifpub) {
1284                         in6_ifa_hold(ifpub);
1285                         spin_unlock_bh(&ifp->lock);
1286                         ipv6_create_tempaddr(ifpub, ifp);
1287                         in6_ifa_put(ifpub);
1288                 } else {
1289                         spin_unlock_bh(&ifp->lock);
1290                 }
1291                 ipv6_del_addr(ifp);
1292 #endif
1293         } else
1294                 ipv6_del_addr(ifp);
1295 }
1296
1297 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1298 {
1299         if (net_ratelimit())
1300                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1301         addrconf_dad_stop(ifp);
1302 }
1303
1304 /* Join to solicited addr multicast group. */
1305
1306 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1307 {
1308         struct in6_addr maddr;
1309
1310         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1311                 return;
1312
1313         addrconf_addr_solict_mult(addr, &maddr);
1314         ipv6_dev_mc_inc(dev, &maddr);
1315 }
1316
1317 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1318 {
1319         struct in6_addr maddr;
1320
1321         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1322                 return;
1323
1324         addrconf_addr_solict_mult(addr, &maddr);
1325         __ipv6_dev_mc_dec(idev, &maddr);
1326 }
1327
1328 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1329 {
1330         struct in6_addr addr;
1331         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1332         if (ipv6_addr_any(&addr))
1333                 return;
1334         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1335 }
1336
1337 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1338 {
1339         struct in6_addr addr;
1340         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1341         if (ipv6_addr_any(&addr))
1342                 return;
1343         __ipv6_dev_ac_dec(ifp->idev, &addr);
1344 }
1345
1346 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1347 {
1348         if (dev->addr_len != ETH_ALEN)
1349                 return -1;
1350         memcpy(eui, dev->dev_addr, 3);
1351         memcpy(eui + 5, dev->dev_addr + 3, 3);
1352
1353         /*
1354          * The zSeries OSA network cards can be shared among various
1355          * OS instances, but the OSA cards have only one MAC address.
1356          * This leads to duplicate address conflicts in conjunction
1357          * with IPv6 if more than one instance uses the same card.
1358          *
1359          * The driver for these cards can deliver a unique 16-bit
1360          * identifier for each instance sharing the same card.  It is
1361          * placed instead of 0xFFFE in the interface identifier.  The
1362          * "u" bit of the interface identifier is not inverted in this
1363          * case.  Hence the resulting interface identifier has local
1364          * scope according to RFC2373.
1365          */
1366         if (dev->dev_id) {
1367                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1368                 eui[4] = dev->dev_id & 0xFF;
1369         } else {
1370                 eui[3] = 0xFF;
1371                 eui[4] = 0xFE;
1372                 eui[0] ^= 2;
1373         }
1374         return 0;
1375 }
1376
1377 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1378 {
1379         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1380         if (dev->addr_len != ARCNET_ALEN)
1381                 return -1;
1382         memset(eui, 0, 7);
1383         eui[7] = *(u8*)dev->dev_addr;
1384         return 0;
1385 }
1386
1387 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1388 {
1389         if (dev->addr_len != INFINIBAND_ALEN)
1390                 return -1;
1391         memcpy(eui, dev->dev_addr + 12, 8);
1392         eui[0] |= 2;
1393         return 0;
1394 }
1395
1396 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1397 {
1398         switch (dev->type) {
1399         case ARPHRD_ETHER:
1400         case ARPHRD_FDDI:
1401         case ARPHRD_IEEE802_TR:
1402                 return addrconf_ifid_eui48(eui, dev);
1403         case ARPHRD_ARCNET:
1404                 return addrconf_ifid_arcnet(eui, dev);
1405         case ARPHRD_INFINIBAND:
1406                 return addrconf_ifid_infiniband(eui, dev);
1407         }
1408         return -1;
1409 }
1410
1411 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1412 {
1413         int err = -1;
1414         struct inet6_ifaddr *ifp;
1415
1416         read_lock_bh(&idev->lock);
1417         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1418                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1419                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1420                         err = 0;
1421                         break;
1422                 }
1423         }
1424         read_unlock_bh(&idev->lock);
1425         return err;
1426 }
1427
1428 #ifdef CONFIG_IPV6_PRIVACY
1429 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1430 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1431 {
1432 regen:
1433         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1434         idev->rndid[0] &= ~0x02;
1435
1436         /*
1437          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1438          * check if generated address is not inappropriate
1439          *
1440          *  - Reserved subnet anycast (RFC 2526)
1441          *      11111101 11....11 1xxxxxxx
1442          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1443          *      00-00-5E-FE-xx-xx-xx-xx
1444          *  - value 0
1445          *  - XXX: already assigned to an address on the device
1446          */
1447         if (idev->rndid[0] == 0xfd &&
1448             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1449             (idev->rndid[7]&0x80))
1450                 goto regen;
1451         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1452                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1453                         goto regen;
1454                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1455                         goto regen;
1456         }
1457
1458         return 0;
1459 }
1460
1461 static void ipv6_regen_rndid(unsigned long data)
1462 {
1463         struct inet6_dev *idev = (struct inet6_dev *) data;
1464         unsigned long expires;
1465
1466         read_lock_bh(&addrconf_lock);
1467         write_lock_bh(&idev->lock);
1468
1469         if (idev->dead)
1470                 goto out;
1471
1472         if (__ipv6_regen_rndid(idev) < 0)
1473                 goto out;
1474
1475         expires = jiffies +
1476                 idev->cnf.temp_prefered_lft * HZ -
1477                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1478         if (time_before(expires, jiffies)) {
1479                 printk(KERN_WARNING
1480                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1481                         idev->dev->name);
1482                 goto out;
1483         }
1484
1485         if (!mod_timer(&idev->regen_timer, expires))
1486                 in6_dev_hold(idev);
1487
1488 out:
1489         write_unlock_bh(&idev->lock);
1490         read_unlock_bh(&addrconf_lock);
1491         in6_dev_put(idev);
1492 }
1493
1494 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1495         int ret = 0;
1496
1497         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1498                 ret = __ipv6_regen_rndid(idev);
1499         return ret;
1500 }
1501 #endif
1502
1503 /*
1504  *      Add prefix route.
1505  */
1506
1507 static void
1508 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1509                       unsigned long expires, u32 flags)
1510 {
1511         struct in6_rtmsg rtmsg;
1512
1513         memset(&rtmsg, 0, sizeof(rtmsg));
1514         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1515         rtmsg.rtmsg_dst_len = plen;
1516         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1517         rtmsg.rtmsg_ifindex = dev->ifindex;
1518         rtmsg.rtmsg_info = expires;
1519         rtmsg.rtmsg_flags = RTF_UP|flags;
1520         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1521
1522         /* Prevent useless cloning on PtP SIT.
1523            This thing is done here expecting that the whole
1524            class of non-broadcast devices need not cloning.
1525          */
1526         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1527                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1528
1529         ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_PREFIX);
1530 }
1531
1532 /* Create "default" multicast route to the interface */
1533
1534 static void addrconf_add_mroute(struct net_device *dev)
1535 {
1536         struct in6_rtmsg rtmsg;
1537
1538         memset(&rtmsg, 0, sizeof(rtmsg));
1539         ipv6_addr_set(&rtmsg.rtmsg_dst,
1540                       htonl(0xFF000000), 0, 0, 0);
1541         rtmsg.rtmsg_dst_len = 8;
1542         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1543         rtmsg.rtmsg_ifindex = dev->ifindex;
1544         rtmsg.rtmsg_flags = RTF_UP;
1545         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1546         ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_LOCAL);
1547 }
1548
1549 static void sit_route_add(struct net_device *dev)
1550 {
1551         struct in6_rtmsg rtmsg;
1552
1553         memset(&rtmsg, 0, sizeof(rtmsg));
1554
1555         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1556         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1557
1558         /* prefix length - 96 bits "::d.d.d.d" */
1559         rtmsg.rtmsg_dst_len     = 96;
1560         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1561         rtmsg.rtmsg_ifindex     = dev->ifindex;
1562
1563         ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_MAIN);
1564 }
1565
1566 static void addrconf_add_lroute(struct net_device *dev)
1567 {
1568         struct in6_addr addr;
1569
1570         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1571         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1572 }
1573
1574 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1575 {
1576         struct inet6_dev *idev;
1577
1578         ASSERT_RTNL();
1579
1580         if ((idev = ipv6_find_idev(dev)) == NULL)
1581                 return NULL;
1582
1583         /* Add default multicast route */
1584         addrconf_add_mroute(dev);
1585
1586         /* Add link local route */
1587         addrconf_add_lroute(dev);
1588         return idev;
1589 }
1590
1591 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1592 {
1593         struct prefix_info *pinfo;
1594         __u32 valid_lft;
1595         __u32 prefered_lft;
1596         int addr_type;
1597         unsigned long rt_expires;
1598         struct inet6_dev *in6_dev;
1599
1600         pinfo = (struct prefix_info *) opt;
1601
1602         if (len < sizeof(struct prefix_info)) {
1603                 ADBG(("addrconf: prefix option too short\n"));
1604                 return;
1605         }
1606
1607         /*
1608          *      Validation checks ([ADDRCONF], page 19)
1609          */
1610
1611         addr_type = ipv6_addr_type(&pinfo->prefix);
1612
1613         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1614                 return;
1615
1616         valid_lft = ntohl(pinfo->valid);
1617         prefered_lft = ntohl(pinfo->prefered);
1618
1619         if (prefered_lft > valid_lft) {
1620                 if (net_ratelimit())
1621                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1622                 return;
1623         }
1624
1625         in6_dev = in6_dev_get(dev);
1626
1627         if (in6_dev == NULL) {
1628                 if (net_ratelimit())
1629                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1630                 return;
1631         }
1632
1633         /*
1634          *      Two things going on here:
1635          *      1) Add routes for on-link prefixes
1636          *      2) Configure prefixes with the auto flag set
1637          */
1638
1639         /* Avoid arithmetic overflow. Really, we could
1640            save rt_expires in seconds, likely valid_lft,
1641            but it would require division in fib gc, that it
1642            not good.
1643          */
1644         if (valid_lft >= 0x7FFFFFFF/HZ)
1645                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1646         else
1647                 rt_expires = valid_lft * HZ;
1648
1649         /*
1650          * We convert this (in jiffies) to clock_t later.
1651          * Avoid arithmetic overflow there as well.
1652          * Overflow can happen only if HZ < USER_HZ.
1653          */
1654         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1655                 rt_expires = 0x7FFFFFFF / USER_HZ;
1656
1657         if (pinfo->onlink) {
1658                 struct rt6_info *rt;
1659                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1660
1661                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1662                         if (rt->rt6i_flags&RTF_EXPIRES) {
1663                                 if (valid_lft == 0) {
1664                                         ip6_del_rt(rt, NULL, NULL, NULL);
1665                                         rt = NULL;
1666                                 } else {
1667                                         rt->rt6i_expires = jiffies + rt_expires;
1668                                 }
1669                         }
1670                 } else if (valid_lft) {
1671                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1672                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1673                 }
1674                 if (rt)
1675                         dst_release(&rt->u.dst);
1676         }
1677
1678         /* Try to figure out our local address for this prefix */
1679
1680         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1681                 struct inet6_ifaddr * ifp;
1682                 struct in6_addr addr;
1683                 int create = 0, update_lft = 0;
1684
1685                 if (pinfo->prefix_len == 64) {
1686                         memcpy(&addr, &pinfo->prefix, 8);
1687                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1688                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1689                                 in6_dev_put(in6_dev);
1690                                 return;
1691                         }
1692                         goto ok;
1693                 }
1694                 if (net_ratelimit())
1695                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1696                                pinfo->prefix_len);
1697                 in6_dev_put(in6_dev);
1698                 return;
1699
1700 ok:
1701
1702                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1703
1704                 if (ifp == NULL && valid_lft) {
1705                         int max_addresses = in6_dev->cnf.max_addresses;
1706
1707                         /* Do not allow to create too much of autoconfigured
1708                          * addresses; this would be too easy way to crash kernel.
1709                          */
1710                         if (!max_addresses ||
1711                             ipv6_count_addresses(in6_dev) < max_addresses)
1712                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1713                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1714
1715                         if (!ifp || IS_ERR(ifp)) {
1716                                 in6_dev_put(in6_dev);
1717                                 return;
1718                         }
1719
1720                         update_lft = create = 1;
1721                         ifp->cstamp = jiffies;
1722                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1723                 }
1724
1725                 if (ifp) {
1726                         int flags;
1727                         unsigned long now;
1728 #ifdef CONFIG_IPV6_PRIVACY
1729                         struct inet6_ifaddr *ift;
1730 #endif
1731                         u32 stored_lft;
1732
1733                         /* update lifetime (RFC2462 5.5.3 e) */
1734                         spin_lock(&ifp->lock);
1735                         now = jiffies;
1736                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1737                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1738                         else
1739                                 stored_lft = 0;
1740                         if (!update_lft && stored_lft) {
1741                                 if (valid_lft > MIN_VALID_LIFETIME ||
1742                                     valid_lft > stored_lft)
1743                                         update_lft = 1;
1744                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1745                                         /* valid_lft <= stored_lft is always true */
1746                                         /* XXX: IPsec */
1747                                         update_lft = 0;
1748                                 } else {
1749                                         valid_lft = MIN_VALID_LIFETIME;
1750                                         if (valid_lft < prefered_lft)
1751                                                 prefered_lft = valid_lft;
1752                                         update_lft = 1;
1753                                 }
1754                         }
1755
1756                         if (update_lft) {
1757                                 ifp->valid_lft = valid_lft;
1758                                 ifp->prefered_lft = prefered_lft;
1759                                 ifp->tstamp = now;
1760                                 flags = ifp->flags;
1761                                 ifp->flags &= ~IFA_F_DEPRECATED;
1762                                 spin_unlock(&ifp->lock);
1763
1764                                 if (!(flags&IFA_F_TENTATIVE))
1765                                         ipv6_ifa_notify(0, ifp);
1766                         } else
1767                                 spin_unlock(&ifp->lock);
1768
1769 #ifdef CONFIG_IPV6_PRIVACY
1770                         read_lock_bh(&in6_dev->lock);
1771                         /* update all temporary addresses in the list */
1772                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1773                                 /*
1774                                  * When adjusting the lifetimes of an existing
1775                                  * temporary address, only lower the lifetimes.
1776                                  * Implementations must not increase the
1777                                  * lifetimes of an existing temporary address
1778                                  * when processing a Prefix Information Option.
1779                                  */
1780                                 spin_lock(&ift->lock);
1781                                 flags = ift->flags;
1782                                 if (ift->valid_lft > valid_lft &&
1783                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1784                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1785                                 if (ift->prefered_lft > prefered_lft &&
1786                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1787                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1788                                 spin_unlock(&ift->lock);
1789                                 if (!(flags&IFA_F_TENTATIVE))
1790                                         ipv6_ifa_notify(0, ift);
1791                         }
1792
1793                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1794                                 /*
1795                                  * When a new public address is created as described in [ADDRCONF],
1796                                  * also create a new temporary address.
1797                                  */
1798                                 read_unlock_bh(&in6_dev->lock);
1799                                 ipv6_create_tempaddr(ifp, NULL);
1800                         } else {
1801                                 read_unlock_bh(&in6_dev->lock);
1802                         }
1803 #endif
1804                         in6_ifa_put(ifp);
1805                         addrconf_verify(0);
1806                 }
1807         }
1808         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1809         in6_dev_put(in6_dev);
1810 }
1811
1812 /*
1813  *      Set destination address.
1814  *      Special case for SIT interfaces where we create a new "virtual"
1815  *      device.
1816  */
1817 int addrconf_set_dstaddr(void __user *arg)
1818 {
1819         struct in6_ifreq ireq;
1820         struct net_device *dev;
1821         int err = -EINVAL;
1822
1823         rtnl_lock();
1824
1825         err = -EFAULT;
1826         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1827                 goto err_exit;
1828
1829         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1830
1831         err = -ENODEV;
1832         if (dev == NULL)
1833                 goto err_exit;
1834
1835         if (dev->type == ARPHRD_SIT) {
1836                 struct ifreq ifr;
1837                 mm_segment_t    oldfs;
1838                 struct ip_tunnel_parm p;
1839
1840                 err = -EADDRNOTAVAIL;
1841                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1842                         goto err_exit;
1843
1844                 memset(&p, 0, sizeof(p));
1845                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1846                 p.iph.saddr = 0;
1847                 p.iph.version = 4;
1848                 p.iph.ihl = 5;
1849                 p.iph.protocol = IPPROTO_IPV6;
1850                 p.iph.ttl = 64;
1851                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1852
1853                 oldfs = get_fs(); set_fs(KERNEL_DS);
1854                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1855                 set_fs(oldfs);
1856
1857                 if (err == 0) {
1858                         err = -ENOBUFS;
1859                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1860                                 goto err_exit;
1861                         err = dev_open(dev);
1862                 }
1863         }
1864
1865 err_exit:
1866         rtnl_unlock();
1867         return err;
1868 }
1869
1870 /*
1871  *      Manual configuration of address on an interface
1872  */
1873 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1874                           __u32 prefered_lft, __u32 valid_lft)
1875 {
1876         struct inet6_ifaddr *ifp;
1877         struct inet6_dev *idev;
1878         struct net_device *dev;
1879         __u8 ifa_flags = 0;
1880         int scope;
1881
1882         ASSERT_RTNL();
1883
1884         /* check the lifetime */
1885         if (!valid_lft || prefered_lft > valid_lft)
1886                 return -EINVAL;
1887
1888         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1889                 return -ENODEV;
1890
1891         if (!(dev->flags&IFF_UP))
1892                 return -ENETDOWN;
1893
1894         if ((idev = addrconf_add_dev(dev)) == NULL)
1895                 return -ENOBUFS;
1896
1897         scope = ipv6_addr_scope(pfx);
1898
1899         if (valid_lft == INFINITY_LIFE_TIME)
1900                 ifa_flags |= IFA_F_PERMANENT;
1901         else if (valid_lft >= 0x7FFFFFFF/HZ)
1902                 valid_lft = 0x7FFFFFFF/HZ;
1903
1904         if (prefered_lft == 0)
1905                 ifa_flags |= IFA_F_DEPRECATED;
1906         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1907                  (prefered_lft != INFINITY_LIFE_TIME))
1908                 prefered_lft = 0x7FFFFFFF/HZ;
1909
1910         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1911
1912         if (!IS_ERR(ifp)) {
1913                 spin_lock_bh(&ifp->lock);
1914                 ifp->valid_lft = valid_lft;
1915                 ifp->prefered_lft = prefered_lft;
1916                 ifp->tstamp = jiffies;
1917                 spin_unlock_bh(&ifp->lock);
1918
1919                 addrconf_dad_start(ifp, 0);
1920                 in6_ifa_put(ifp);
1921                 addrconf_verify(0);
1922                 return 0;
1923         }
1924
1925         return PTR_ERR(ifp);
1926 }
1927
1928 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1929 {
1930         struct inet6_ifaddr *ifp;
1931         struct inet6_dev *idev;
1932         struct net_device *dev;
1933
1934         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1935                 return -ENODEV;
1936
1937         if ((idev = __in6_dev_get(dev)) == NULL)
1938                 return -ENXIO;
1939
1940         read_lock_bh(&idev->lock);
1941         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1942                 if (ifp->prefix_len == plen &&
1943                     ipv6_addr_equal(pfx, &ifp->addr)) {
1944                         in6_ifa_hold(ifp);
1945                         read_unlock_bh(&idev->lock);
1946
1947                         ipv6_del_addr(ifp);
1948
1949                         /* If the last address is deleted administratively,
1950                            disable IPv6 on this interface.
1951                          */
1952                         if (idev->addr_list == NULL)
1953                                 addrconf_ifdown(idev->dev, 1);
1954                         return 0;
1955                 }
1956         }
1957         read_unlock_bh(&idev->lock);
1958         return -EADDRNOTAVAIL;
1959 }
1960
1961
1962 int addrconf_add_ifaddr(void __user *arg)
1963 {
1964         struct in6_ifreq ireq;
1965         int err;
1966
1967         if (!capable(CAP_NET_ADMIN))
1968                 return -EPERM;
1969
1970         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1971                 return -EFAULT;
1972
1973         rtnl_lock();
1974         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1975                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1976         rtnl_unlock();
1977         return err;
1978 }
1979
1980 int addrconf_del_ifaddr(void __user *arg)
1981 {
1982         struct in6_ifreq ireq;
1983         int err;
1984
1985         if (!capable(CAP_NET_ADMIN))
1986                 return -EPERM;
1987
1988         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1989                 return -EFAULT;
1990
1991         rtnl_lock();
1992         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1993         rtnl_unlock();
1994         return err;
1995 }
1996
1997 static void sit_add_v4_addrs(struct inet6_dev *idev)
1998 {
1999         struct inet6_ifaddr * ifp;
2000         struct in6_addr addr;
2001         struct net_device *dev;
2002         int scope;
2003
2004         ASSERT_RTNL();
2005
2006         memset(&addr, 0, sizeof(struct in6_addr));
2007         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2008
2009         if (idev->dev->flags&IFF_POINTOPOINT) {
2010                 addr.s6_addr32[0] = htonl(0xfe800000);
2011                 scope = IFA_LINK;
2012         } else {
2013                 scope = IPV6_ADDR_COMPATv4;
2014         }
2015
2016         if (addr.s6_addr32[3]) {
2017                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2018                 if (!IS_ERR(ifp)) {
2019                         spin_lock_bh(&ifp->lock);
2020                         ifp->flags &= ~IFA_F_TENTATIVE;
2021                         spin_unlock_bh(&ifp->lock);
2022                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2023                         in6_ifa_put(ifp);
2024                 }
2025                 return;
2026         }
2027
2028         for (dev = dev_base; dev != NULL; dev = dev->next) {
2029                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2030                 if (in_dev && (dev->flags & IFF_UP)) {
2031                         struct in_ifaddr * ifa;
2032
2033                         int flag = scope;
2034
2035                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2036                                 int plen;
2037
2038                                 addr.s6_addr32[3] = ifa->ifa_local;
2039
2040                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2041                                         continue;
2042                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2043                                         if (idev->dev->flags&IFF_POINTOPOINT)
2044                                                 continue;
2045                                         flag |= IFA_HOST;
2046                                 }
2047                                 if (idev->dev->flags&IFF_POINTOPOINT)
2048                                         plen = 64;
2049                                 else
2050                                         plen = 96;
2051
2052                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2053                                                     IFA_F_PERMANENT);
2054                                 if (!IS_ERR(ifp)) {
2055                                         spin_lock_bh(&ifp->lock);
2056                                         ifp->flags &= ~IFA_F_TENTATIVE;
2057                                         spin_unlock_bh(&ifp->lock);
2058                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2059                                         in6_ifa_put(ifp);
2060                                 }
2061                         }
2062                 }
2063         }
2064 }
2065
2066 static void init_loopback(struct net_device *dev)
2067 {
2068         struct inet6_dev  *idev;
2069         struct inet6_ifaddr * ifp;
2070
2071         /* ::1 */
2072
2073         ASSERT_RTNL();
2074
2075         if ((idev = ipv6_find_idev(dev)) == NULL) {
2076                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2077                 return;
2078         }
2079
2080         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2081         if (!IS_ERR(ifp)) {
2082                 spin_lock_bh(&ifp->lock);
2083                 ifp->flags &= ~IFA_F_TENTATIVE;
2084                 spin_unlock_bh(&ifp->lock);
2085                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2086                 in6_ifa_put(ifp);
2087         }
2088 }
2089
2090 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2091 {
2092         struct inet6_ifaddr * ifp;
2093
2094         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2095         if (!IS_ERR(ifp)) {
2096                 addrconf_dad_start(ifp, 0);
2097                 in6_ifa_put(ifp);
2098         }
2099 }
2100
2101 static void addrconf_dev_config(struct net_device *dev)
2102 {
2103         struct in6_addr addr;
2104         struct inet6_dev    * idev;
2105
2106         ASSERT_RTNL();
2107
2108         if ((dev->type != ARPHRD_ETHER) &&
2109             (dev->type != ARPHRD_FDDI) &&
2110             (dev->type != ARPHRD_IEEE802_TR) &&
2111             (dev->type != ARPHRD_ARCNET) &&
2112             (dev->type != ARPHRD_INFINIBAND)) {
2113                 /* Alas, we support only Ethernet autoconfiguration. */
2114                 return;
2115         }
2116
2117         idev = addrconf_add_dev(dev);
2118         if (idev == NULL)
2119                 return;
2120
2121         memset(&addr, 0, sizeof(struct in6_addr));
2122         addr.s6_addr32[0] = htonl(0xFE800000);
2123
2124         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2125                 addrconf_add_linklocal(idev, &addr);
2126 }
2127
2128 static void addrconf_sit_config(struct net_device *dev)
2129 {
2130         struct inet6_dev *idev;
2131
2132         ASSERT_RTNL();
2133
2134         /*
2135          * Configure the tunnel with one of our IPv4
2136          * addresses... we should configure all of
2137          * our v4 addrs in the tunnel
2138          */
2139
2140         if ((idev = ipv6_find_idev(dev)) == NULL) {
2141                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2142                 return;
2143         }
2144
2145         sit_add_v4_addrs(idev);
2146
2147         if (dev->flags&IFF_POINTOPOINT) {
2148                 addrconf_add_mroute(dev);
2149                 addrconf_add_lroute(dev);
2150         } else
2151                 sit_route_add(dev);
2152 }
2153
2154 static inline int
2155 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2156 {
2157         struct in6_addr lladdr;
2158
2159         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2160                 addrconf_add_linklocal(idev, &lladdr);
2161                 return 0;
2162         }
2163         return -1;
2164 }
2165
2166 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2167 {
2168         struct net_device *link_dev;
2169
2170         /* first try to inherit the link-local address from the link device */
2171         if (idev->dev->iflink &&
2172             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2173                 if (!ipv6_inherit_linklocal(idev, link_dev))
2174                         return;
2175         }
2176         /* then try to inherit it from any device */
2177         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2178                 if (!ipv6_inherit_linklocal(idev, link_dev))
2179                         return;
2180         }
2181         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2182 }
2183
2184 /*
2185  * Autoconfigure tunnel with a link-local address so routing protocols,
2186  * DHCPv6, MLD etc. can be run over the virtual link
2187  */
2188
2189 static void addrconf_ip6_tnl_config(struct net_device *dev)
2190 {
2191         struct inet6_dev *idev;
2192
2193         ASSERT_RTNL();
2194
2195         if ((idev = addrconf_add_dev(dev)) == NULL) {
2196                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2197                 return;
2198         }
2199         ip6_tnl_add_linklocal(idev);
2200 }
2201
2202 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2203                            void * data)
2204 {
2205         struct net_device *dev = (struct net_device *) data;
2206         struct inet6_dev *idev = __in6_dev_get(dev);
2207         int run_pending = 0;
2208
2209         switch(event) {
2210         case NETDEV_UP:
2211         case NETDEV_CHANGE:
2212                 if (event == NETDEV_UP) {
2213                         if (!netif_carrier_ok(dev)) {
2214                                 /* device is not ready yet. */
2215                                 printk(KERN_INFO
2216                                         "ADDRCONF(NETDEV_UP): %s: "
2217                                         "link is not ready\n",
2218                                         dev->name);
2219                                 break;
2220                         }
2221
2222                         if (idev)
2223                                 idev->if_flags |= IF_READY;
2224                 } else {
2225                         if (!netif_carrier_ok(dev)) {
2226                                 /* device is still not ready. */
2227                                 break;
2228                         }
2229
2230                         if (idev) {
2231                                 if (idev->if_flags & IF_READY) {
2232                                         /* device is already configured. */
2233                                         break;
2234                                 }
2235                                 idev->if_flags |= IF_READY;
2236                         }
2237
2238                         printk(KERN_INFO
2239                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2240                                         "link becomes ready\n",
2241                                         dev->name);
2242
2243                         run_pending = 1;
2244                 }
2245
2246                 switch(dev->type) {
2247                 case ARPHRD_SIT:
2248                         addrconf_sit_config(dev);
2249                         break;
2250                 case ARPHRD_TUNNEL6:
2251                         addrconf_ip6_tnl_config(dev);
2252                         break;
2253                 case ARPHRD_LOOPBACK:
2254                         init_loopback(dev);
2255                         break;
2256
2257                 default:
2258                         addrconf_dev_config(dev);
2259                         break;
2260                 };
2261                 if (idev) {
2262                         if (run_pending)
2263                                 addrconf_dad_run(idev);
2264
2265                         /* If the MTU changed during the interface down, when the
2266                            interface up, the changed MTU must be reflected in the
2267                            idev as well as routers.
2268                          */
2269                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2270                                 rt6_mtu_change(dev, dev->mtu);
2271                                 idev->cnf.mtu6 = dev->mtu;
2272                         }
2273                         idev->tstamp = jiffies;
2274                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2275                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2276                            stop IPv6 on this interface.
2277                          */
2278                         if (dev->mtu < IPV6_MIN_MTU)
2279                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2280                 }
2281                 break;
2282
2283         case NETDEV_CHANGEMTU:
2284                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2285                         rt6_mtu_change(dev, dev->mtu);
2286                         idev->cnf.mtu6 = dev->mtu;
2287                         break;
2288                 }
2289
2290                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2291
2292         case NETDEV_DOWN:
2293         case NETDEV_UNREGISTER:
2294                 /*
2295                  *      Remove all addresses from this interface.
2296                  */
2297                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2298                 break;
2299
2300         case NETDEV_CHANGENAME:
2301 #ifdef CONFIG_SYSCTL
2302                 if (idev) {
2303                         addrconf_sysctl_unregister(&idev->cnf);
2304                         neigh_sysctl_unregister(idev->nd_parms);
2305                         neigh_sysctl_register(dev, idev->nd_parms,
2306                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2307                                               &ndisc_ifinfo_sysctl_change,
2308                                               NULL);
2309                         addrconf_sysctl_register(idev, &idev->cnf);
2310                 }
2311 #endif
2312                 break;
2313         };
2314
2315         return NOTIFY_OK;
2316 }
2317
2318 /*
2319  *      addrconf module should be notified of a device going up
2320  */
2321 static struct notifier_block ipv6_dev_notf = {
2322         .notifier_call = addrconf_notify,
2323         .priority = 0
2324 };
2325
2326 static int addrconf_ifdown(struct net_device *dev, int how)
2327 {
2328         struct inet6_dev *idev;
2329         struct inet6_ifaddr *ifa, **bifa;
2330         int i;
2331
2332         ASSERT_RTNL();
2333
2334         if (dev == &loopback_dev && how == 1)
2335                 how = 0;
2336
2337         rt6_ifdown(dev);
2338         neigh_ifdown(&nd_tbl, dev);
2339
2340         idev = __in6_dev_get(dev);
2341         if (idev == NULL)
2342                 return -ENODEV;
2343
2344         /* Step 1: remove reference to ipv6 device from parent device.
2345                    Do not dev_put!
2346          */
2347         if (how == 1) {
2348                 write_lock_bh(&addrconf_lock);
2349                 dev->ip6_ptr = NULL;
2350                 idev->dead = 1;
2351                 write_unlock_bh(&addrconf_lock);
2352
2353                 /* Step 1.5: remove snmp6 entry */
2354                 snmp6_unregister_dev(idev);
2355
2356         }
2357
2358         /* Step 2: clear hash table */
2359         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2360                 bifa = &inet6_addr_lst[i];
2361
2362                 write_lock_bh(&addrconf_hash_lock);
2363                 while ((ifa = *bifa) != NULL) {
2364                         if (ifa->idev == idev) {
2365                                 *bifa = ifa->lst_next;
2366                                 ifa->lst_next = NULL;
2367                                 addrconf_del_timer(ifa);
2368                                 in6_ifa_put(ifa);
2369                                 continue;
2370                         }
2371                         bifa = &ifa->lst_next;
2372                 }
2373                 write_unlock_bh(&addrconf_hash_lock);
2374         }
2375
2376         write_lock_bh(&idev->lock);
2377
2378         /* Step 3: clear flags for stateless addrconf */
2379         if (how != 1)
2380                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2381
2382         /* Step 4: clear address list */
2383 #ifdef CONFIG_IPV6_PRIVACY
2384         if (how == 1 && del_timer(&idev->regen_timer))
2385                 in6_dev_put(idev);
2386
2387         /* clear tempaddr list */
2388         while ((ifa = idev->tempaddr_list) != NULL) {
2389                 idev->tempaddr_list = ifa->tmp_next;
2390                 ifa->tmp_next = NULL;
2391                 ifa->dead = 1;
2392                 write_unlock_bh(&idev->lock);
2393                 spin_lock_bh(&ifa->lock);
2394
2395                 if (ifa->ifpub) {
2396                         in6_ifa_put(ifa->ifpub);
2397                         ifa->ifpub = NULL;
2398                 }
2399                 spin_unlock_bh(&ifa->lock);
2400                 in6_ifa_put(ifa);
2401                 write_lock_bh(&idev->lock);
2402         }
2403 #endif
2404         while ((ifa = idev->addr_list) != NULL) {
2405                 idev->addr_list = ifa->if_next;
2406                 ifa->if_next = NULL;
2407                 ifa->dead = 1;
2408                 addrconf_del_timer(ifa);
2409                 write_unlock_bh(&idev->lock);
2410
2411                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2412                 in6_ifa_put(ifa);
2413
2414                 write_lock_bh(&idev->lock);
2415         }
2416         write_unlock_bh(&idev->lock);
2417
2418         /* Step 5: Discard multicast list */
2419
2420         if (how == 1)
2421                 ipv6_mc_destroy_dev(idev);
2422         else
2423                 ipv6_mc_down(idev);
2424
2425         /* Step 5: netlink notification of this interface */
2426         idev->tstamp = jiffies;
2427         inet6_ifinfo_notify(RTM_DELLINK, idev);
2428
2429         /* Shot the device (if unregistered) */
2430
2431         if (how == 1) {
2432 #ifdef CONFIG_SYSCTL
2433                 addrconf_sysctl_unregister(&idev->cnf);
2434                 neigh_sysctl_unregister(idev->nd_parms);
2435 #endif
2436                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2437                 neigh_ifdown(&nd_tbl, dev);
2438                 in6_dev_put(idev);
2439         }
2440         return 0;
2441 }
2442
2443 static void addrconf_rs_timer(unsigned long data)
2444 {
2445         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2446
2447         if (ifp->idev->cnf.forwarding)
2448                 goto out;
2449
2450         if (ifp->idev->if_flags & IF_RA_RCVD) {
2451                 /*
2452                  *      Announcement received after solicitation
2453                  *      was sent
2454                  */
2455                 goto out;
2456         }
2457
2458         spin_lock(&ifp->lock);
2459         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2460                 struct in6_addr all_routers;
2461
2462                 /* The wait after the last probe can be shorter */
2463                 addrconf_mod_timer(ifp, AC_RS,
2464                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2465                                    ifp->idev->cnf.rtr_solicit_delay :
2466                                    ifp->idev->cnf.rtr_solicit_interval);
2467                 spin_unlock(&ifp->lock);
2468
2469                 ipv6_addr_all_routers(&all_routers);
2470
2471                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2472         } else {
2473                 spin_unlock(&ifp->lock);
2474                 /*
2475                  * Note: we do not support deprecated "all on-link"
2476                  * assumption any longer.
2477                  */
2478                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2479                        ifp->idev->dev->name);
2480         }
2481
2482 out:
2483         in6_ifa_put(ifp);
2484 }
2485
2486 /*
2487  *      Duplicate Address Detection
2488  */
2489 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2490 {
2491         unsigned long rand_num;
2492         struct inet6_dev *idev = ifp->idev;
2493
2494         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2495         ifp->probes = idev->cnf.dad_transmits;
2496         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2497 }
2498
2499 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2500 {
2501         struct inet6_dev *idev = ifp->idev;
2502         struct net_device *dev = idev->dev;
2503
2504         addrconf_join_solict(dev, &ifp->addr);
2505
2506         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2507                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2508                                         flags);
2509
2510         net_srandom(ifp->addr.s6_addr32[3]);
2511
2512         read_lock_bh(&idev->lock);
2513         if (ifp->dead)
2514                 goto out;
2515         spin_lock_bh(&ifp->lock);
2516
2517         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2518             !(ifp->flags&IFA_F_TENTATIVE)) {
2519                 ifp->flags &= ~IFA_F_TENTATIVE;
2520                 spin_unlock_bh(&ifp->lock);
2521                 read_unlock_bh(&idev->lock);
2522
2523                 addrconf_dad_completed(ifp);
2524                 return;
2525         }
2526
2527         if (!(idev->if_flags & IF_READY)) {
2528                 spin_unlock_bh(&ifp->lock);
2529                 read_unlock_bh(&idev->lock);
2530                 /*
2531                  * If the defice is not ready:
2532                  * - keep it tentative if it is a permanent address.
2533                  * - otherwise, kill it.
2534                  */
2535                 in6_ifa_hold(ifp);
2536                 addrconf_dad_stop(ifp);
2537                 return;
2538         }
2539         addrconf_dad_kick(ifp);
2540         spin_unlock_bh(&ifp->lock);
2541 out:
2542         read_unlock_bh(&idev->lock);
2543 }
2544
2545 static void addrconf_dad_timer(unsigned long data)
2546 {
2547         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2548         struct inet6_dev *idev = ifp->idev;
2549         struct in6_addr unspec;
2550         struct in6_addr mcaddr;
2551
2552         read_lock_bh(&idev->lock);
2553         if (idev->dead) {
2554                 read_unlock_bh(&idev->lock);
2555                 goto out;
2556         }
2557         spin_lock_bh(&ifp->lock);
2558         if (ifp->probes == 0) {
2559                 /*
2560                  * DAD was successful
2561                  */
2562
2563                 ifp->flags &= ~IFA_F_TENTATIVE;
2564                 spin_unlock_bh(&ifp->lock);
2565                 read_unlock_bh(&idev->lock);
2566
2567                 addrconf_dad_completed(ifp);
2568
2569                 goto out;
2570         }
2571
2572         ifp->probes--;
2573         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2574         spin_unlock_bh(&ifp->lock);
2575         read_unlock_bh(&idev->lock);
2576
2577         /* send a neighbour solicitation for our addr */
2578         memset(&unspec, 0, sizeof(unspec));
2579         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2580         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2581 out:
2582         in6_ifa_put(ifp);
2583 }
2584
2585 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2586 {
2587         struct net_device *     dev = ifp->idev->dev;
2588
2589         /*
2590          *      Configure the address for reception. Now it is valid.
2591          */
2592
2593         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2594
2595         /* If added prefix is link local and forwarding is off,
2596            start sending router solicitations.
2597          */
2598
2599         if (ifp->idev->cnf.forwarding == 0 &&
2600             ifp->idev->cnf.rtr_solicits > 0 &&
2601             (dev->flags&IFF_LOOPBACK) == 0 &&
2602             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2603                 struct in6_addr all_routers;
2604
2605                 ipv6_addr_all_routers(&all_routers);
2606
2607                 /*
2608                  *      If a host as already performed a random delay
2609                  *      [...] as part of DAD [...] there is no need
2610                  *      to delay again before sending the first RS
2611                  */
2612                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2613
2614                 spin_lock_bh(&ifp->lock);
2615                 ifp->probes = 1;
2616                 ifp->idev->if_flags |= IF_RS_SENT;
2617                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2618                 spin_unlock_bh(&ifp->lock);
2619         }
2620 }
2621
2622 static void addrconf_dad_run(struct inet6_dev *idev) {
2623         struct inet6_ifaddr *ifp;
2624
2625         read_lock_bh(&idev->lock);
2626         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2627                 spin_lock_bh(&ifp->lock);
2628                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2629                         spin_unlock_bh(&ifp->lock);
2630                         continue;
2631                 }
2632                 spin_unlock_bh(&ifp->lock);
2633                 addrconf_dad_kick(ifp);
2634         }
2635         read_unlock_bh(&idev->lock);
2636 }
2637
2638 #ifdef CONFIG_PROC_FS
2639 struct if6_iter_state {
2640         int bucket;
2641 };
2642
2643 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2644 {
2645         struct inet6_ifaddr *ifa = NULL;
2646         struct if6_iter_state *state = seq->private;
2647
2648         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2649                 ifa = inet6_addr_lst[state->bucket];
2650                 if (ifa)
2651                         break;
2652         }
2653         return ifa;
2654 }
2655
2656 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2657 {
2658         struct if6_iter_state *state = seq->private;
2659
2660         ifa = ifa->lst_next;
2661 try_again:
2662         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2663                 ifa = inet6_addr_lst[state->bucket];
2664                 goto try_again;
2665         }
2666         return ifa;
2667 }
2668
2669 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2670 {
2671         struct inet6_ifaddr *ifa = if6_get_first(seq);
2672
2673         if (ifa)
2674                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2675                         --pos;
2676         return pos ? NULL : ifa;
2677 }
2678
2679 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2680 {
2681         read_lock_bh(&addrconf_hash_lock);
2682         return if6_get_idx(seq, *pos);
2683 }
2684
2685 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2686 {
2687         struct inet6_ifaddr *ifa;
2688
2689         ifa = if6_get_next(seq, v);
2690         ++*pos;
2691         return ifa;
2692 }
2693
2694 static void if6_seq_stop(struct seq_file *seq, void *v)
2695 {
2696         read_unlock_bh(&addrconf_hash_lock);
2697 }
2698
2699 static int if6_seq_show(struct seq_file *seq, void *v)
2700 {
2701         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2702         seq_printf(seq,
2703                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2704                    NIP6(ifp->addr),
2705                    ifp->idev->dev->ifindex,
2706                    ifp->prefix_len,
2707                    ifp->scope,
2708                    ifp->flags,
2709                    ifp->idev->dev->name);
2710         return 0;
2711 }
2712
2713 static struct seq_operations if6_seq_ops = {
2714         .start  = if6_seq_start,
2715         .next   = if6_seq_next,
2716         .show   = if6_seq_show,
2717         .stop   = if6_seq_stop,
2718 };
2719
2720 static int if6_seq_open(struct inode *inode, struct file *file)
2721 {
2722         struct seq_file *seq;
2723         int rc = -ENOMEM;
2724         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2725
2726         if (!s)
2727                 goto out;
2728
2729         rc = seq_open(file, &if6_seq_ops);
2730         if (rc)
2731                 goto out_kfree;
2732
2733         seq = file->private_data;
2734         seq->private = s;
2735 out:
2736         return rc;
2737 out_kfree:
2738         kfree(s);
2739         goto out;
2740 }
2741
2742 static struct file_operations if6_fops = {
2743         .owner          = THIS_MODULE,
2744         .open           = if6_seq_open,
2745         .read           = seq_read,
2746         .llseek         = seq_lseek,
2747         .release        = seq_release_private,
2748 };
2749
2750 int __init if6_proc_init(void)
2751 {
2752         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2753                 return -ENOMEM;
2754         return 0;
2755 }
2756
2757 void if6_proc_exit(void)
2758 {
2759         proc_net_remove("if_inet6");
2760 }
2761 #endif  /* CONFIG_PROC_FS */
2762
2763 /*
2764  *      Periodic address status verification
2765  */
2766
2767 static void addrconf_verify(unsigned long foo)
2768 {
2769         struct inet6_ifaddr *ifp;
2770         unsigned long now, next;
2771         int i;
2772
2773         spin_lock_bh(&addrconf_verify_lock);
2774         now = jiffies;
2775         next = now + ADDR_CHECK_FREQUENCY;
2776
2777         del_timer(&addr_chk_timer);
2778
2779         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2780
2781 restart:
2782                 read_lock(&addrconf_hash_lock);
2783                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2784                         unsigned long age;
2785 #ifdef CONFIG_IPV6_PRIVACY
2786                         unsigned long regen_advance;
2787 #endif
2788
2789                         if (ifp->flags & IFA_F_PERMANENT)
2790                                 continue;
2791
2792                         spin_lock(&ifp->lock);
2793                         age = (now - ifp->tstamp) / HZ;
2794
2795 #ifdef CONFIG_IPV6_PRIVACY
2796                         regen_advance = ifp->idev->cnf.regen_max_retry *
2797                                         ifp->idev->cnf.dad_transmits *
2798                                         ifp->idev->nd_parms->retrans_time / HZ;
2799 #endif
2800
2801                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2802                             age >= ifp->valid_lft) {
2803                                 spin_unlock(&ifp->lock);
2804                                 in6_ifa_hold(ifp);
2805                                 read_unlock(&addrconf_hash_lock);
2806                                 ipv6_del_addr(ifp);
2807                                 goto restart;
2808                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2809                                 spin_unlock(&ifp->lock);
2810                                 continue;
2811                         } else if (age >= ifp->prefered_lft) {
2812                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2813                                 int deprecate = 0;
2814
2815                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2816                                         deprecate = 1;
2817                                         ifp->flags |= IFA_F_DEPRECATED;
2818                                 }
2819
2820                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2821                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2822
2823                                 spin_unlock(&ifp->lock);
2824
2825                                 if (deprecate) {
2826                                         in6_ifa_hold(ifp);
2827                                         read_unlock(&addrconf_hash_lock);
2828
2829                                         ipv6_ifa_notify(0, ifp);
2830                                         in6_ifa_put(ifp);
2831                                         goto restart;
2832                                 }
2833 #ifdef CONFIG_IPV6_PRIVACY
2834                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2835                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2836                                 if (age >= ifp->prefered_lft - regen_advance) {
2837                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2838                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2839                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2840                                         if (!ifp->regen_count && ifpub) {
2841                                                 ifp->regen_count++;
2842                                                 in6_ifa_hold(ifp);
2843                                                 in6_ifa_hold(ifpub);
2844                                                 spin_unlock(&ifp->lock);
2845                                                 read_unlock(&addrconf_hash_lock);
2846                                                 spin_lock(&ifpub->lock);
2847                                                 ifpub->regen_count = 0;
2848                                                 spin_unlock(&ifpub->lock);
2849                                                 ipv6_create_tempaddr(ifpub, ifp);
2850                                                 in6_ifa_put(ifpub);
2851                                                 in6_ifa_put(ifp);
2852                                                 goto restart;
2853                                         }
2854                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2855                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2856                                 spin_unlock(&ifp->lock);
2857 #endif
2858                         } else {
2859                                 /* ifp->prefered_lft <= ifp->valid_lft */
2860                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2861                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2862                                 spin_unlock(&ifp->lock);
2863                         }
2864                 }
2865                 read_unlock(&addrconf_hash_lock);
2866         }
2867
2868         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2869         add_timer(&addr_chk_timer);
2870         spin_unlock_bh(&addrconf_verify_lock);
2871 }
2872
2873 static int
2874 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2875 {
2876         struct rtattr **rta = arg;
2877         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2878         struct in6_addr *pfx;
2879
2880         pfx = NULL;
2881         if (rta[IFA_ADDRESS-1]) {
2882                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2883                         return -EINVAL;
2884                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2885         }
2886         if (rta[IFA_LOCAL-1]) {
2887                 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
2888                     (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
2889                         return -EINVAL;
2890                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2891         }
2892         if (pfx == NULL)
2893                 return -EINVAL;
2894
2895         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2896 }
2897
2898 static int
2899 inet6_addr_modify(int ifindex, struct in6_addr *pfx,
2900                   __u32 prefered_lft, __u32 valid_lft)
2901 {
2902         struct inet6_ifaddr *ifp = NULL;
2903         struct net_device *dev;
2904         int ifa_flags = 0;
2905
2906         if ((dev = __dev_get_by_index(ifindex)) == NULL)
2907                 return -ENODEV;
2908
2909         if (!(dev->flags&IFF_UP))
2910                 return -ENETDOWN;
2911
2912         if (!valid_lft || (prefered_lft > valid_lft))
2913                 return -EINVAL;
2914
2915         ifp = ipv6_get_ifaddr(pfx, dev, 1);
2916         if (ifp == NULL)
2917                 return -ENOENT;
2918
2919         if (valid_lft == INFINITY_LIFE_TIME)
2920                 ifa_flags = IFA_F_PERMANENT;
2921         else if (valid_lft >= 0x7FFFFFFF/HZ)
2922                 valid_lft = 0x7FFFFFFF/HZ;
2923
2924         if (prefered_lft == 0)
2925                 ifa_flags = IFA_F_DEPRECATED;
2926         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2927                  (prefered_lft != INFINITY_LIFE_TIME))
2928                 prefered_lft = 0x7FFFFFFF/HZ;
2929
2930         spin_lock_bh(&ifp->lock);
2931         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED|IFA_F_PERMANENT)) | ifa_flags;
2932
2933         ifp->tstamp = jiffies;
2934         ifp->valid_lft = valid_lft;
2935         ifp->prefered_lft = prefered_lft;
2936
2937         spin_unlock_bh(&ifp->lock);
2938         if (!(ifp->flags&IFA_F_TENTATIVE))
2939                 ipv6_ifa_notify(0, ifp);
2940         in6_ifa_put(ifp);
2941
2942         addrconf_verify(0);
2943
2944         return 0;
2945 }
2946
2947 static int
2948 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2949 {
2950         struct rtattr  **rta = arg;
2951         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2952         struct in6_addr *pfx;
2953         __u32 valid_lft = INFINITY_LIFE_TIME, prefered_lft = INFINITY_LIFE_TIME;
2954
2955         pfx = NULL;
2956         if (rta[IFA_ADDRESS-1]) {
2957                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2958                         return -EINVAL;
2959                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2960         }
2961         if (rta[IFA_LOCAL-1]) {
2962                 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
2963                     (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
2964                         return -EINVAL;
2965                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2966         }
2967         if (pfx == NULL)
2968                 return -EINVAL;
2969
2970         if (rta[IFA_CACHEINFO-1]) {
2971                 struct ifa_cacheinfo *ci;
2972                 if (RTA_PAYLOAD(rta[IFA_CACHEINFO-1]) < sizeof(*ci))
2973                         return -EINVAL;
2974                 ci = RTA_DATA(rta[IFA_CACHEINFO-1]);
2975                 valid_lft = ci->ifa_valid;
2976                 prefered_lft = ci->ifa_prefered;
2977         }
2978
2979         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2980                 int ret;
2981                 ret = inet6_addr_modify(ifm->ifa_index, pfx,
2982                                         prefered_lft, valid_lft);
2983                 if (ret == 0 || !(nlh->nlmsg_flags & NLM_F_CREATE))
2984                         return ret;
2985         }
2986
2987         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
2988                               prefered_lft, valid_lft);
2989
2990 }
2991
2992 /* Maximum length of ifa_cacheinfo attributes */
2993 #define INET6_IFADDR_RTA_SPACE \
2994                 RTA_SPACE(16) /* IFA_ADDRESS */ + \
2995                 RTA_SPACE(sizeof(struct ifa_cacheinfo)) /* CACHEINFO */
2996
2997 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2998                              u32 pid, u32 seq, int event, unsigned int flags)
2999 {
3000         struct ifaddrmsg *ifm;
3001         struct nlmsghdr  *nlh;
3002         struct ifa_cacheinfo ci;
3003         unsigned char    *b = skb->tail;
3004
3005         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3006         ifm = NLMSG_DATA(nlh);
3007         ifm->ifa_family = AF_INET6;
3008         ifm->ifa_prefixlen = ifa->prefix_len;
3009         ifm->ifa_flags = ifa->flags;
3010         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3011         if (ifa->scope&IFA_HOST)
3012                 ifm->ifa_scope = RT_SCOPE_HOST;
3013         else if (ifa->scope&IFA_LINK)
3014                 ifm->ifa_scope = RT_SCOPE_LINK;
3015         else if (ifa->scope&IFA_SITE)
3016                 ifm->ifa_scope = RT_SCOPE_SITE;
3017         ifm->ifa_index = ifa->idev->dev->ifindex;
3018         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
3019         if (!(ifa->flags&IFA_F_PERMANENT)) {
3020                 ci.ifa_prefered = ifa->prefered_lft;
3021                 ci.ifa_valid = ifa->valid_lft;
3022                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
3023                         long tval = (jiffies - ifa->tstamp)/HZ;
3024                         ci.ifa_prefered -= tval;
3025                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
3026                                 ci.ifa_valid -= tval;
3027                 }
3028         } else {
3029                 ci.ifa_prefered = INFINITY_LIFE_TIME;
3030                 ci.ifa_valid = INFINITY_LIFE_TIME;
3031         }
3032         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
3033                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3034         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
3035                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3036         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3037         nlh->nlmsg_len = skb->tail - b;
3038         return skb->len;
3039
3040 nlmsg_failure:
3041 rtattr_failure:
3042         skb_trim(skb, b - skb->data);
3043         return -1;
3044 }
3045
3046 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3047                                 u32 pid, u32 seq, int event, u16 flags)
3048 {
3049         struct ifaddrmsg *ifm;
3050         struct nlmsghdr  *nlh;
3051         struct ifa_cacheinfo ci;
3052         unsigned char    *b = skb->tail;
3053
3054         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3055         ifm = NLMSG_DATA(nlh);
3056         ifm->ifa_family = AF_INET6;
3057         ifm->ifa_prefixlen = 128;
3058         ifm->ifa_flags = IFA_F_PERMANENT;
3059         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3060         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
3061                 ifm->ifa_scope = RT_SCOPE_SITE;
3062         ifm->ifa_index = ifmca->idev->dev->ifindex;
3063         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
3064         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
3065                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
3066                     * 100 / HZ);
3067         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
3068                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
3069                     * 100 / HZ);
3070         ci.ifa_prefered = INFINITY_LIFE_TIME;
3071         ci.ifa_valid = INFINITY_LIFE_TIME;
3072         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3073         nlh->nlmsg_len = skb->tail - b;
3074         return skb->len;
3075
3076 nlmsg_failure:
3077 rtattr_failure:
3078         skb_trim(skb, b - skb->data);
3079         return -1;
3080 }
3081
3082 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3083                                 u32 pid, u32 seq, int event, unsigned int flags)
3084 {
3085         struct ifaddrmsg *ifm;
3086         struct nlmsghdr  *nlh;
3087         struct ifa_cacheinfo ci;
3088         unsigned char    *b = skb->tail;
3089
3090         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3091         ifm = NLMSG_DATA(nlh);
3092         ifm->ifa_family = AF_INET6;
3093         ifm->ifa_prefixlen = 128;
3094         ifm->ifa_flags = IFA_F_PERMANENT;
3095         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3096         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
3097                 ifm->ifa_scope = RT_SCOPE_SITE;
3098         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
3099         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
3100         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
3101                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
3102                     * 100 / HZ);
3103         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
3104                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
3105                     * 100 / HZ);
3106         ci.ifa_prefered = INFINITY_LIFE_TIME;
3107         ci.ifa_valid = INFINITY_LIFE_TIME;
3108         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3109         nlh->nlmsg_len = skb->tail - b;
3110         return skb->len;
3111
3112 nlmsg_failure:
3113 rtattr_failure:
3114         skb_trim(skb, b - skb->data);
3115         return -1;
3116 }
3117
3118 enum addr_type_t
3119 {
3120         UNICAST_ADDR,
3121         MULTICAST_ADDR,
3122         ANYCAST_ADDR,
3123 };
3124
3125 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3126                            enum addr_type_t type)
3127 {
3128         int idx, ip_idx;
3129         int s_idx, s_ip_idx;
3130         int err = 1;
3131         struct net_device *dev;
3132         struct inet6_dev *idev = NULL;
3133         struct inet6_ifaddr *ifa;
3134         struct ifmcaddr6 *ifmca;
3135         struct ifacaddr6 *ifaca;
3136
3137         s_idx = cb->args[0];
3138         s_ip_idx = ip_idx = cb->args[1];
3139         read_lock(&dev_base_lock);
3140
3141         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3142                 if (idx < s_idx)
3143                         continue;
3144                 if (idx > s_idx)
3145                         s_ip_idx = 0;
3146                 ip_idx = 0;
3147                 if ((idev = in6_dev_get(dev)) == NULL)
3148                         continue;
3149                 read_lock_bh(&idev->lock);
3150                 switch (type) {
3151                 case UNICAST_ADDR:
3152                         /* unicast address incl. temp addr */
3153                         for (ifa = idev->addr_list; ifa;
3154                              ifa = ifa->if_next, ip_idx++) {
3155                                 if (ip_idx < s_ip_idx)
3156                                         continue;
3157                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3158                                     NETLINK_CB(cb->skb).pid,
3159                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3160                                     NLM_F_MULTI)) <= 0)
3161                                         goto done;
3162                         }
3163                         break;
3164                 case MULTICAST_ADDR:
3165                         /* multicast address */
3166                         for (ifmca = idev->mc_list; ifmca;
3167                              ifmca = ifmca->next, ip_idx++) {
3168                                 if (ip_idx < s_ip_idx)
3169                                         continue;
3170                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3171                                     NETLINK_CB(cb->skb).pid,
3172                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3173                                     NLM_F_MULTI)) <= 0)
3174                                         goto done;
3175                         }
3176                         break;
3177                 case ANYCAST_ADDR:
3178                         /* anycast address */
3179                         for (ifaca = idev->ac_list; ifaca;
3180                              ifaca = ifaca->aca_next, ip_idx++) {
3181                                 if (ip_idx < s_ip_idx)
3182                                         continue;
3183                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3184                                     NETLINK_CB(cb->skb).pid,
3185                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3186                                     NLM_F_MULTI)) <= 0)
3187                                         goto done;
3188                         }
3189                         break;
3190                 default:
3191                         break;
3192                 }
3193                 read_unlock_bh(&idev->lock);
3194                 in6_dev_put(idev);
3195         }
3196 done:
3197         if (err <= 0) {
3198                 read_unlock_bh(&idev->lock);
3199                 in6_dev_put(idev);
3200         }
3201         read_unlock(&dev_base_lock);
3202         cb->args[0] = idx;
3203         cb->args[1] = ip_idx;
3204         return skb->len;
3205 }
3206
3207 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3208 {
3209         enum addr_type_t type = UNICAST_ADDR;
3210         return inet6_dump_addr(skb, cb, type);
3211 }
3212
3213 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3214 {
3215         enum addr_type_t type = MULTICAST_ADDR;
3216         return inet6_dump_addr(skb, cb, type);
3217 }
3218
3219
3220 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3221 {
3222         enum addr_type_t type = ANYCAST_ADDR;
3223         return inet6_dump_addr(skb, cb, type);
3224 }
3225
3226 static int inet6_rtm_getaddr(struct sk_buff *in_skb,
3227                 struct nlmsghdr* nlh, void *arg)
3228 {
3229         struct rtattr **rta = arg;
3230         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
3231         struct in6_addr *addr = NULL;
3232         struct net_device *dev = NULL;
3233         struct inet6_ifaddr *ifa;
3234         struct sk_buff *skb;
3235         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE);
3236         int err;
3237
3238         if (rta[IFA_ADDRESS-1]) {
3239                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*addr))
3240                         return -EINVAL;
3241                 addr = RTA_DATA(rta[IFA_ADDRESS-1]);
3242         }
3243         if (rta[IFA_LOCAL-1]) {
3244                 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*addr) ||
3245                     (addr && memcmp(addr, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*addr))))
3246                         return -EINVAL;
3247                 addr = RTA_DATA(rta[IFA_LOCAL-1]);
3248         }
3249         if (addr == NULL)
3250                 return -EINVAL;
3251
3252         if (ifm->ifa_index)
3253                 dev = __dev_get_by_index(ifm->ifa_index);
3254
3255         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL)
3256                 return -EADDRNOTAVAIL;
3257
3258         if ((skb = alloc_skb(size, GFP_KERNEL)) == NULL) {
3259                 err = -ENOBUFS;
3260                 goto out;
3261         }
3262
3263         NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
3264         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3265                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3266         if (err < 0) {
3267                 err = -EMSGSIZE;
3268                 goto out_free;
3269         }
3270
3271         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3272 out:
3273         in6_ifa_put(ifa);
3274         return err;
3275 out_free:
3276         kfree_skb(skb);
3277         goto out;
3278 }
3279
3280 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3281 {
3282         struct sk_buff *skb;
3283         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE);
3284
3285         skb = alloc_skb(size, GFP_ATOMIC);
3286         if (!skb) {
3287                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3288                 return;
3289         }
3290         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3291                 kfree_skb(skb);
3292                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3293                 return;
3294         }
3295         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3296         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3297 }
3298
3299 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3300                                 __s32 *array, int bytes)
3301 {
3302         memset(array, 0, bytes);
3303         array[DEVCONF_FORWARDING] = cnf->forwarding;
3304         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3305         array[DEVCONF_MTU6] = cnf->mtu6;
3306         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3307         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3308         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3309         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3310         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3311         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3312         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3313         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3314 #ifdef CONFIG_IPV6_PRIVACY
3315         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3316         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3317         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3318         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3319         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3320 #endif
3321         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3322         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3323         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3324 #ifdef CONFIG_IPV6_ROUTER_PREF
3325         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3326         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3327 #ifdef CONFIV_IPV6_ROUTE_INFO
3328         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3329 #endif
3330 #endif
3331 }
3332
3333 /* Maximum length of ifinfomsg attributes */
3334 #define INET6_IFINFO_RTA_SPACE \
3335                 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \
3336                 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \
3337                 RTA_SPACE(sizeof(u32)) /* MTU */ + \
3338                 RTA_SPACE(sizeof(int)) /* LINK */ + \
3339                 RTA_SPACE(0) /* PROTINFO */ + \
3340                 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \
3341                 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \
3342                 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */
3343
3344 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3345                              u32 pid, u32 seq, int event, unsigned int flags)
3346 {
3347         struct net_device       *dev = idev->dev;
3348         __s32                   *array = NULL;
3349         struct ifinfomsg        *r;
3350         struct nlmsghdr         *nlh;
3351         unsigned char           *b = skb->tail;
3352         struct rtattr           *subattr;
3353         __u32                   mtu = dev->mtu;
3354         struct ifla_cacheinfo   ci;
3355
3356         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3357         r = NLMSG_DATA(nlh);
3358         r->ifi_family = AF_INET6;
3359         r->__ifi_pad = 0;
3360         r->ifi_type = dev->type;
3361         r->ifi_index = dev->ifindex;
3362         r->ifi_flags = dev_get_flags(dev);
3363         r->ifi_change = 0;
3364
3365         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3366
3367         if (dev->addr_len)
3368                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3369
3370         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3371         if (dev->ifindex != dev->iflink)
3372                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3373
3374         subattr = (struct rtattr*)skb->tail;
3375
3376         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3377
3378         /* return the device flags */
3379         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3380
3381         /* return interface cacheinfo */
3382         ci.max_reasm_len = IPV6_MAXPLEN;
3383         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3384                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3385         ci.reachable_time = idev->nd_parms->reachable_time;
3386         ci.retrans_time = idev->nd_parms->retrans_time;
3387         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3388
3389         /* return the device sysctl params */
3390         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3391                 goto rtattr_failure;
3392         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3393         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3394
3395         /* XXX - Statistics/MC not implemented */
3396         subattr->rta_len = skb->tail - (u8*)subattr;
3397
3398         nlh->nlmsg_len = skb->tail - b;
3399         kfree(array);
3400         return skb->len;
3401
3402 nlmsg_failure:
3403 rtattr_failure:
3404         kfree(array);
3405         skb_trim(skb, b - skb->data);
3406         return -1;
3407 }
3408
3409 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3410 {
3411         int idx, err;
3412         int s_idx = cb->args[0];
3413         struct net_device *dev;
3414         struct inet6_dev *idev;
3415
3416         read_lock(&dev_base_lock);
3417         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3418                 if (idx < s_idx)
3419                         continue;
3420                 if ((idev = in6_dev_get(dev)) == NULL)
3421                         continue;
3422                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3423                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3424                 in6_dev_put(idev);
3425                 if (err <= 0)
3426                         break;
3427         }
3428         read_unlock(&dev_base_lock);
3429         cb->args[0] = idx;
3430
3431         return skb->len;
3432 }
3433
3434 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3435 {
3436         struct sk_buff *skb;
3437         int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE);
3438
3439         skb = alloc_skb(size, GFP_ATOMIC);
3440         if (!skb) {
3441                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3442                 return;
3443         }
3444         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3445                 kfree_skb(skb);
3446                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3447                 return;
3448         }
3449         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3450         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3451 }
3452
3453 /* Maximum length of prefix_cacheinfo attributes */
3454 #define INET6_PREFIX_RTA_SPACE \
3455                 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \
3456                 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */
3457
3458 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3459                         struct prefix_info *pinfo, u32 pid, u32 seq,
3460                         int event, unsigned int flags)
3461 {
3462         struct prefixmsg        *pmsg;
3463         struct nlmsghdr         *nlh;
3464         unsigned char           *b = skb->tail;
3465         struct prefix_cacheinfo ci;
3466
3467         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3468         pmsg = NLMSG_DATA(nlh);
3469         pmsg->prefix_family = AF_INET6;
3470         pmsg->prefix_pad1 = 0;
3471         pmsg->prefix_pad2 = 0;
3472         pmsg->prefix_ifindex = idev->dev->ifindex;
3473         pmsg->prefix_len = pinfo->prefix_len;
3474         pmsg->prefix_type = pinfo->type;
3475         pmsg->prefix_pad3 = 0;
3476
3477         pmsg->prefix_flags = 0;
3478         if (pinfo->onlink)
3479                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3480         if (pinfo->autoconf)
3481                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3482
3483         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3484
3485         ci.preferred_time = ntohl(pinfo->prefered);
3486         ci.valid_time = ntohl(pinfo->valid);
3487         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3488
3489         nlh->nlmsg_len = skb->tail - b;
3490         return skb->len;
3491
3492 nlmsg_failure:
3493 rtattr_failure:
3494         skb_trim(skb, b - skb->data);
3495         return -1;
3496 }
3497
3498 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3499                          struct prefix_info *pinfo)
3500 {
3501         struct sk_buff *skb;
3502         int size = NLMSG_SPACE(sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE);
3503
3504         skb = alloc_skb(size, GFP_ATOMIC);
3505         if (!skb) {
3506                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3507                 return;
3508         }
3509         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3510                 kfree_skb(skb);
3511                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3512                 return;
3513         }
3514         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3515         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3516 }
3517
3518 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3519         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3520         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3521         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3522         [RTM_GETADDR - RTM_BASE] = { .doit      = inet6_rtm_getaddr,
3523                                      .dumpit    = inet6_dump_ifaddr, },
3524         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3525         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3526         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3527         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3528         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3529                                       .dumpit   = inet6_dump_fib, },
3530 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3531         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = fib6_rules_dump,   },
3532 #endif
3533 };
3534
3535 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3536 {
3537         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3538
3539         switch (event) {
3540         case RTM_NEWADDR:
3541                 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3542                 if (ifp->idev->cnf.forwarding)
3543                         addrconf_join_anycast(ifp);
3544                 break;
3545         case RTM_DELADDR:
3546                 if (ifp->idev->cnf.forwarding)
3547                         addrconf_leave_anycast(ifp);
3548                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3549                 dst_hold(&ifp->rt->u.dst);
3550                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3551                         dst_free(&ifp->rt->u.dst);
3552                 break;
3553         }
3554 }
3555
3556 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3557 {
3558         read_lock_bh(&addrconf_lock);
3559         if (likely(ifp->idev->dead == 0))
3560                 __ipv6_ifa_notify(event, ifp);
3561         read_unlock_bh(&addrconf_lock);
3562 }
3563
3564 #ifdef CONFIG_SYSCTL
3565
3566 static
3567 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3568                            void __user *buffer, size_t *lenp, loff_t *ppos)
3569 {
3570         int *valp = ctl->data;
3571         int val = *valp;
3572         int ret;
3573
3574         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3575
3576         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3577                 if (valp != &ipv6_devconf.forwarding) {
3578                         if ((!*valp) ^ (!val)) {
3579                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3580                                 if (idev == NULL)
3581                                         return ret;
3582                                 dev_forward_change(idev);
3583                         }
3584                 } else {
3585                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3586                         addrconf_forward_change();
3587                 }
3588                 if (*valp)
3589                         rt6_purge_dflt_routers();
3590         }
3591
3592         return ret;
3593 }
3594
3595 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3596                                             int __user *name, int nlen,
3597                                             void __user *oldval,
3598                                             size_t __user *oldlenp,
3599                                             void __user *newval, size_t newlen,
3600                                             void **context)
3601 {
3602         int *valp = table->data;
3603         int new;
3604
3605         if (!newval || !newlen)
3606                 return 0;
3607         if (newlen != sizeof(int))
3608                 return -EINVAL;
3609         if (get_user(new, (int __user *)newval))
3610                 return -EFAULT;
3611         if (new == *valp)
3612                 return 0;
3613         if (oldval && oldlenp) {
3614                 size_t len;
3615                 if (get_user(len, oldlenp))
3616                         return -EFAULT;
3617                 if (len) {
3618                         if (len > table->maxlen)
3619                                 len = table->maxlen;
3620                         if (copy_to_user(oldval, valp, len))
3621                                 return -EFAULT;
3622                         if (put_user(len, oldlenp))
3623                                 return -EFAULT;
3624                 }
3625         }
3626
3627         if (valp != &ipv6_devconf_dflt.forwarding) {
3628                 if (valp != &ipv6_devconf.forwarding) {
3629                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3630                         int changed;
3631                         if (unlikely(idev == NULL))
3632                                 return -ENODEV;
3633                         changed = (!*valp) ^ (!new);
3634                         *valp = new;
3635                         if (changed)
3636                                 dev_forward_change(idev);
3637                 } else {
3638                         *valp = new;
3639                         addrconf_forward_change();
3640                 }
3641
3642                 if (*valp)
3643                         rt6_purge_dflt_routers();
3644         } else
3645                 *valp = new;
3646
3647         return 1;
3648 }
3649
3650 static struct addrconf_sysctl_table
3651 {
3652         struct ctl_table_header *sysctl_header;
3653         ctl_table addrconf_vars[__NET_IPV6_MAX];
3654         ctl_table addrconf_dev[2];
3655         ctl_table addrconf_conf_dir[2];
3656         ctl_table addrconf_proto_dir[2];
3657         ctl_table addrconf_root_dir[2];
3658 } addrconf_sysctl = {
3659         .sysctl_header = NULL,
3660         .addrconf_vars = {
3661                 {
3662                         .ctl_name       =       NET_IPV6_FORWARDING,
3663                         .procname       =       "forwarding",
3664                         .data           =       &ipv6_devconf.forwarding,
3665                         .maxlen         =       sizeof(int),
3666                         .mode           =       0644,
3667                         .proc_handler   =       &addrconf_sysctl_forward,
3668                         .strategy       =       &addrconf_sysctl_forward_strategy,
3669                 },
3670                 {
3671                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3672                         .procname       =       "hop_limit",
3673                         .data           =       &ipv6_devconf.hop_limit,
3674                         .maxlen         =       sizeof(int),
3675                         .mode           =       0644,
3676                         .proc_handler   =       proc_dointvec,
3677                 },
3678                 {
3679                         .ctl_name       =       NET_IPV6_MTU,
3680                         .procname       =       "mtu",
3681                         .data           =       &ipv6_devconf.mtu6,
3682                         .maxlen         =       sizeof(int),
3683                         .mode           =       0644,
3684                         .proc_handler   =       &proc_dointvec,
3685                 },
3686                 {
3687                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3688                         .procname       =       "accept_ra",
3689                         .data           =       &ipv6_devconf.accept_ra,
3690                         .maxlen         =       sizeof(int),
3691                         .mode           =       0644,
3692                         .proc_handler   =       &proc_dointvec,
3693                 },
3694                 {
3695                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3696                         .procname       =       "accept_redirects",
3697                         .data           =       &ipv6_devconf.accept_redirects,
3698                         .maxlen         =       sizeof(int),
3699                         .mode           =       0644,
3700                         .proc_handler   =       &proc_dointvec,
3701                 },
3702                 {
3703                         .ctl_name       =       NET_IPV6_AUTOCONF,
3704                         .procname       =       "autoconf",
3705                         .data           =       &ipv6_devconf.autoconf,
3706                         .maxlen         =       sizeof(int),
3707                         .mode           =       0644,
3708                         .proc_handler   =       &proc_dointvec,
3709                 },
3710                 {
3711                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3712                         .procname       =       "dad_transmits",
3713                         .data           =       &ipv6_devconf.dad_transmits,
3714                         .maxlen         =       sizeof(int),
3715                         .mode           =       0644,
3716                         .proc_handler   =       &proc_dointvec,
3717                 },
3718                 {
3719                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3720                         .procname       =       "router_solicitations",
3721                         .data           =       &ipv6_devconf.rtr_solicits,
3722                         .maxlen         =       sizeof(int),
3723                         .mode           =       0644,
3724                         .proc_handler   =       &proc_dointvec,
3725                 },
3726                 {
3727                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3728                         .procname       =       "router_solicitation_interval",
3729                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3730                         .maxlen         =       sizeof(int),
3731                         .mode           =       0644,
3732                         .proc_handler   =       &proc_dointvec_jiffies,
3733                         .strategy       =       &sysctl_jiffies,
3734                 },
3735                 {
3736                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3737                         .procname       =       "router_solicitation_delay",
3738                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3739                         .maxlen         =       sizeof(int),
3740                         .mode           =       0644,
3741                         .proc_handler   =       &proc_dointvec_jiffies,
3742                         .strategy       =       &sysctl_jiffies,
3743                 },
3744                 {
3745                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3746                         .procname       =       "force_mld_version",
3747                         .data           =       &ipv6_devconf.force_mld_version,
3748                         .maxlen         =       sizeof(int),
3749                         .mode           =       0644,
3750                         .proc_handler   =       &proc_dointvec,
3751                 },
3752 #ifdef CONFIG_IPV6_PRIVACY
3753                 {
3754                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3755                         .procname       =       "use_tempaddr",
3756                         .data           =       &ipv6_devconf.use_tempaddr,
3757                         .maxlen         =       sizeof(int),
3758                         .mode           =       0644,
3759                         .proc_handler   =       &proc_dointvec,
3760                 },
3761                 {
3762                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3763                         .procname       =       "temp_valid_lft",
3764                         .data           =       &ipv6_devconf.temp_valid_lft,
3765                         .maxlen         =       sizeof(int),
3766                         .mode           =       0644,
3767                         .proc_handler   =       &proc_dointvec,
3768                 },
3769                 {
3770                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3771                         .procname       =       "temp_prefered_lft",
3772                         .data           =       &ipv6_devconf.temp_prefered_lft,
3773                         .maxlen         =       sizeof(int),
3774                         .mode           =       0644,
3775                         .proc_handler   =       &proc_dointvec,
3776                 },
3777                 {
3778                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3779                         .procname       =       "regen_max_retry",
3780                         .data           =       &ipv6_devconf.regen_max_retry,
3781                         .maxlen         =       sizeof(int),
3782                         .mode           =       0644,
3783                         .proc_handler   =       &proc_dointvec,
3784                 },
3785                 {
3786                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3787                         .procname       =       "max_desync_factor",
3788                         .data           =       &ipv6_devconf.max_desync_factor,
3789                         .maxlen         =       sizeof(int),
3790                         .mode           =       0644,
3791                         .proc_handler   =       &proc_dointvec,
3792                 },
3793 #endif
3794                 {
3795                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3796                         .procname       =       "max_addresses",
3797                         .data           =       &ipv6_devconf.max_addresses,
3798                         .maxlen         =       sizeof(int),
3799                         .mode           =       0644,
3800                         .proc_handler   =       &proc_dointvec,
3801                 },
3802                 {
3803                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3804                         .procname       =       "accept_ra_defrtr",
3805                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3806                         .maxlen         =       sizeof(int),
3807                         .mode           =       0644,
3808                         .proc_handler   =       &proc_dointvec,
3809                 },
3810                 {
3811                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3812                         .procname       =       "accept_ra_pinfo",
3813                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3814                         .maxlen         =       sizeof(int),
3815                         .mode           =       0644,
3816                         .proc_handler   =       &proc_dointvec,
3817                 },
3818 #ifdef CONFIG_IPV6_ROUTER_PREF
3819                 {
3820                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3821                         .procname       =       "accept_ra_rtr_pref",
3822                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3823                         .maxlen         =       sizeof(int),
3824                         .mode           =       0644,
3825                         .proc_handler   =       &proc_dointvec,
3826                 },
3827                 {
3828                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3829                         .procname       =       "router_probe_interval",
3830                         .data           =       &ipv6_devconf.rtr_probe_interval,
3831                         .maxlen         =       sizeof(int),
3832                         .mode           =       0644,
3833                         .proc_handler   =       &proc_dointvec_jiffies,
3834                         .strategy       =       &sysctl_jiffies,
3835                 },
3836 #ifdef CONFIV_IPV6_ROUTE_INFO
3837                 {
3838                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3839                         .procname       =       "accept_ra_rt_info_max_plen",
3840                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3841                         .maxlen         =       sizeof(int),
3842                         .mode           =       0644,
3843                         .proc_handler   =       &proc_dointvec,
3844                 },
3845 #endif
3846 #endif
3847                 {
3848                         .ctl_name       =       0,      /* sentinel */
3849                 }
3850         },
3851         .addrconf_dev = {
3852                 {
3853                         .ctl_name       =       NET_PROTO_CONF_ALL,
3854                         .procname       =       "all",
3855                         .mode           =       0555,
3856                         .child          =       addrconf_sysctl.addrconf_vars,
3857                 },
3858                 {
3859                         .ctl_name       =       0,      /* sentinel */
3860                 }
3861         },
3862         .addrconf_conf_dir = {
3863                 {
3864                         .ctl_name       =       NET_IPV6_CONF,
3865                         .procname       =       "conf",
3866                         .mode           =       0555,
3867                         .child          =       addrconf_sysctl.addrconf_dev,
3868                 },
3869                 {
3870                         .ctl_name       =       0,      /* sentinel */
3871                 }
3872         },
3873         .addrconf_proto_dir = {
3874                 {
3875                         .ctl_name       =       NET_IPV6,
3876                         .procname       =       "ipv6",
3877                         .mode           =       0555,
3878                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3879                 },
3880                 {
3881                         .ctl_name       =       0,      /* sentinel */
3882                 }
3883         },
3884         .addrconf_root_dir = {
3885                 {
3886                         .ctl_name       =       CTL_NET,
3887                         .procname       =       "net",
3888                         .mode           =       0555,
3889                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3890                 },
3891                 {
3892                         .ctl_name       =       0,      /* sentinel */
3893                 }
3894         },
3895 };
3896
3897 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3898 {
3899         int i;
3900         struct net_device *dev = idev ? idev->dev : NULL;
3901         struct addrconf_sysctl_table *t;
3902         char *dev_name = NULL;
3903
3904         t = kmalloc(sizeof(*t), GFP_KERNEL);
3905         if (t == NULL)
3906                 return;
3907         memcpy(t, &addrconf_sysctl, sizeof(*t));
3908         for (i=0; t->addrconf_vars[i].data; i++) {
3909                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3910                 t->addrconf_vars[i].de = NULL;
3911                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3912         }
3913         if (dev) {
3914                 dev_name = dev->name;
3915                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3916         } else {
3917                 dev_name = "default";
3918                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3919         }
3920
3921         /*
3922          * Make a copy of dev_name, because '.procname' is regarded as const
3923          * by sysctl and we wouldn't want anyone to change it under our feet
3924          * (see SIOCSIFNAME).
3925          */
3926         dev_name = kstrdup(dev_name, GFP_KERNEL);
3927         if (!dev_name)
3928             goto free;
3929
3930         t->addrconf_dev[0].procname = dev_name;
3931
3932         t->addrconf_dev[0].child = t->addrconf_vars;
3933         t->addrconf_dev[0].de = NULL;
3934         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3935         t->addrconf_conf_dir[0].de = NULL;
3936         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3937         t->addrconf_proto_dir[0].de = NULL;
3938         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3939         t->addrconf_root_dir[0].de = NULL;
3940
3941         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3942         if (t->sysctl_header == NULL)
3943                 goto free_procname;
3944         else
3945                 p->sysctl = t;
3946         return;
3947
3948         /* error path */
3949  free_procname:
3950         kfree(dev_name);
3951  free:
3952         kfree(t);
3953
3954         return;
3955 }
3956
3957 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3958 {
3959         if (p->sysctl) {
3960                 struct addrconf_sysctl_table *t = p->sysctl;
3961                 p->sysctl = NULL;
3962                 unregister_sysctl_table(t->sysctl_header);
3963                 kfree(t->addrconf_dev[0].procname);
3964                 kfree(t);
3965         }
3966 }
3967
3968
3969 #endif
3970
3971 /*
3972  *      Device notifier
3973  */
3974
3975 int register_inet6addr_notifier(struct notifier_block *nb)
3976 {
3977         return atomic_notifier_chain_register(&inet6addr_chain, nb);
3978 }
3979
3980 int unregister_inet6addr_notifier(struct notifier_block *nb)
3981 {
3982         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
3983 }
3984
3985 /*
3986  *      Init / cleanup code
3987  */
3988
3989 int __init addrconf_init(void)
3990 {
3991         int err = 0;
3992
3993         /* The addrconf netdev notifier requires that loopback_dev
3994          * has it's ipv6 private information allocated and setup
3995          * before it can bring up and give link-local addresses
3996          * to other devices which are up.
3997          *
3998          * Unfortunately, loopback_dev is not necessarily the first
3999          * entry in the global dev_base list of net devices.  In fact,
4000          * it is likely to be the very last entry on that list.
4001          * So this causes the notifier registry below to try and
4002          * give link-local addresses to all devices besides loopback_dev
4003          * first, then loopback_dev, which cases all the non-loopback_dev
4004          * devices to fail to get a link-local address.
4005          *
4006          * So, as a temporary fix, allocate the ipv6 structure for
4007          * loopback_dev first by hand.
4008          * Longer term, all of the dependencies ipv6 has upon the loopback
4009          * device and it being up should be removed.
4010          */
4011         rtnl_lock();
4012         if (!ipv6_add_dev(&loopback_dev))
4013                 err = -ENOMEM;
4014         rtnl_unlock();
4015         if (err)
4016                 return err;
4017
4018         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4019
4020         register_netdevice_notifier(&ipv6_dev_notf);
4021
4022         addrconf_verify(0);
4023         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4024 #ifdef CONFIG_SYSCTL
4025         addrconf_sysctl.sysctl_header =
4026                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
4027         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4028 #endif
4029
4030         return 0;
4031 }
4032
4033 void __exit addrconf_cleanup(void)
4034 {
4035         struct net_device *dev;
4036         struct inet6_dev *idev;
4037         struct inet6_ifaddr *ifa;
4038         int i;
4039
4040         unregister_netdevice_notifier(&ipv6_dev_notf);
4041
4042         rtnetlink_links[PF_INET6] = NULL;
4043 #ifdef CONFIG_SYSCTL
4044         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4045         addrconf_sysctl_unregister(&ipv6_devconf);
4046 #endif
4047
4048         rtnl_lock();
4049
4050         /*
4051          *      clean dev list.
4052          */
4053
4054         for (dev=dev_base; dev; dev=dev->next) {
4055                 if ((idev = __in6_dev_get(dev)) == NULL)
4056                         continue;
4057                 addrconf_ifdown(dev, 1);
4058         }
4059         addrconf_ifdown(&loopback_dev, 2);
4060
4061         /*
4062          *      Check hash table.
4063          */
4064
4065         write_lock_bh(&addrconf_hash_lock);
4066         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4067                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4068                         struct inet6_ifaddr *bifa;
4069
4070                         bifa = ifa;
4071                         ifa = ifa->lst_next;
4072                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4073                         /* Do not free it; something is wrong.
4074                            Now we can investigate it with debugger.
4075                          */
4076                 }
4077         }
4078         write_unlock_bh(&addrconf_hash_lock);
4079
4080         del_timer(&addr_chk_timer);
4081
4082         rtnl_unlock();
4083
4084 #ifdef CONFIG_PROC_FS
4085         proc_net_remove("if_inet6");
4086 #endif
4087 }