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

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/config.h>
  44 #include <linux/errno.h>
  45 #include <linux/types.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/sched.h>
  49 #include <linux/net.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.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/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/sock.h>
  66 #include <net/snmp.h>
  67
  68 #include <net/ipv6.h>
  69 #include <net/protocol.h>
  70 #include <net/ndisc.h>
  71 #include <net/ip6_route.h>
  72 #include <net/addrconf.h>
  73 #include <net/tcp.h>
  74 #include <net/ip.h>
  75 #include <linux/if_tunnel.h>
  76 #include <linux/rtnetlink.h>
  77
  78 #ifdef CONFIG_IPV6_PRIVACY
  79 #include <linux/random.h>
  80 #include <linux/crypto.h>
  81 #include <linux/scatterlist.h>
  82 #endif
  83
  84 #include <asm/uaccess.h>
  85
  86 #include <linux/proc_fs.h>
  87 #include <linux/seq_file.h>
  88
  89 /* Set to 3 to get tracing... */
  90 #define ACONF_DEBUG 2
  91
  92 #if ACONF_DEBUG >= 3
  93 #define ADBG(x) printk x
  94 #else
  95 #define ADBG(x)
  96 #endif
  97
  98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 100
 101 #ifdef CONFIG_SYSCTL
 102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 104 #endif
 105
 106 #ifdef CONFIG_IPV6_PRIVACY
 107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 109 static void ipv6_regen_rndid(unsigned long data);
 110
 111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 112 static struct crypto_tfm *md5_tfm;
 113 static DEFINE_SPINLOCK(md5_tfm_lock);
 114 #endif
 115
 116 static int ipv6_count_addresses(struct inet6_dev *idev);
 117
 118 /*
 119  *      Configured unicast address hash table
 120  */
 121 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 122 static DEFINE_RWLOCK(addrconf_hash_lock);
 123
 124 /* Protects inet6 devices */
 125 DEFINE_RWLOCK(addrconf_lock);
 126
 127 static void addrconf_verify(unsigned long);
 128
 129 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 130 static DEFINE_SPINLOCK(addrconf_verify_lock);
 131
 132 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 133 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 134
 135 static int addrconf_ifdown(struct net_device *dev, int how);
 136
 137 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 138 static void addrconf_dad_timer(unsigned long data);
 139 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 140 static void addrconf_rs_timer(unsigned long data);
 141 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 142 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 143
 144 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 145                                 struct prefix_info *pinfo);
 146 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 147
 148 static struct notifier_block *inet6addr_chain;
 149
 150 struct ipv6_devconf ipv6_devconf = {
 151         .forwarding             = 0,
 152         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 153         .mtu6                   = IPV6_MIN_MTU,
 154         .accept_ra              = 1,
 155         .accept_redirects       = 1,
 156         .autoconf               = 1,
 157         .force_mld_version      = 0,
 158         .dad_transmits          = 1,
 159         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 160         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 161         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 162 #ifdef CONFIG_IPV6_PRIVACY
 163         .use_tempaddr           = 0,
 164         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 165         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 166         .regen_max_retry        = REGEN_MAX_RETRY,
 167         .max_desync_factor      = MAX_DESYNC_FACTOR,
 168 #endif
 169         .max_addresses          = IPV6_MAX_ADDRESSES,
 170 };
 171
 172 static struct ipv6_devconf ipv6_devconf_dflt = {
 173         .forwarding             = 0,
 174         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 175         .mtu6                   = IPV6_MIN_MTU,
 176         .accept_ra              = 1,
 177         .accept_redirects       = 1,
 178         .autoconf               = 1,
 179         .dad_transmits          = 1,
 180         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 181         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 182         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 183 #ifdef CONFIG_IPV6_PRIVACY
 184         .use_tempaddr           = 0,
 185         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 186         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 187         .regen_max_retry        = REGEN_MAX_RETRY,
 188         .max_desync_factor      = MAX_DESYNC_FACTOR,
 189 #endif
 190         .max_addresses          = IPV6_MAX_ADDRESSES,
 191 };
 192
 193 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 194 #if 0
 195 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 196 #endif
 197 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 198
 199 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 200
 201 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 202 {
 203         switch(scope) {
 204         case IPV6_ADDR_SCOPE_NODELOCAL:
 205                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 206                         IPV6_ADDR_LOOPBACK);
 207         case IPV6_ADDR_SCOPE_LINKLOCAL:
 208                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 209                         IPV6_ADDR_LINKLOCAL);
 210         case IPV6_ADDR_SCOPE_SITELOCAL:
 211                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 212                         IPV6_ADDR_SITELOCAL);
 213         }
 214         return IPV6_ADDR_SCOPE_TYPE(scope);
 215 }
 216
 217 int __ipv6_addr_type(const struct in6_addr *addr)
 218 {
 219         u32 st;
 220
 221         st = addr->s6_addr32[0];
 222
 223         /* Consider all addresses with the first three bits different of
 224            000 and 111 as unicasts.
 225          */
 226         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 227             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 228                 return (IPV6_ADDR_UNICAST |
 229                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 230
 231         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 232                 /* multicast */
 233                 /* addr-select 3.1 */
 234                 return (IPV6_ADDR_MULTICAST |
 235                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 236         }
 237
 238         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 239                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 240                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 241         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 242                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 243                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 244
 245         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 246                 if (addr->s6_addr32[2] == 0) {
 247                         if (addr->s6_addr32[3] == 0)
 248                                 return IPV6_ADDR_ANY;
 249
 250                         if (addr->s6_addr32[3] == htonl(0x00000001))
 251                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 252                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 253
 254                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 255                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 256                 }
 257
 258                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 259                         return (IPV6_ADDR_MAPPED |
 260                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 261         }
 262
 263         return (IPV6_ADDR_RESERVED |
 264                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 265 }
 266
 267 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 268 {
 269         if (del_timer(&ifp->timer))
 270                 __in6_ifa_put(ifp);
 271 }
 272
 273 enum addrconf_timer_t
 274 {
 275         AC_NONE,
 276         AC_DAD,
 277         AC_RS,
 278 };
 279
 280 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 281                                enum addrconf_timer_t what,
 282                                unsigned long when)
 283 {
 284         if (!del_timer(&ifp->timer))
 285                 in6_ifa_hold(ifp);
 286
 287         switch (what) {
 288         case AC_DAD:
 289                 ifp->timer.function = addrconf_dad_timer;
 290                 break;
 291         case AC_RS:
 292                 ifp->timer.function = addrconf_rs_timer;
 293                 break;
 294         default:;
 295         }
 296         ifp->timer.expires = jiffies + when;
 297         add_timer(&ifp->timer);
 298 }
 299
 300 /* Nobody refers to this device, we may destroy it. */
 301
 302 void in6_dev_finish_destroy(struct inet6_dev *idev)
 303 {
 304         struct net_device *dev = idev->dev;
 305         BUG_TRAP(idev->addr_list==NULL);
 306         BUG_TRAP(idev->mc_list==NULL);
 307 #ifdef NET_REFCNT_DEBUG
 308         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 309 #endif
 310         dev_put(dev);
 311         if (!idev->dead) {
 312                 printk("Freeing alive inet6 device %p\n", idev);
 313                 return;
 314         }
 315         snmp6_free_dev(idev);
 316         kfree(idev);
 317 }
 318
 319 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 320 {
 321         struct inet6_dev *ndev;
 322
 323         ASSERT_RTNL();
 324
 325         if (dev->mtu < IPV6_MIN_MTU)
 326                 return NULL;
 327
 328         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 329
 330         if (ndev) {
 331                 memset(ndev, 0, sizeof(struct inet6_dev));
 332
 333                 rwlock_init(&ndev->lock);
 334                 ndev->dev = dev;
 335                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 336                 ndev->cnf.mtu6 = dev->mtu;
 337                 ndev->cnf.sysctl = NULL;
 338                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 339                 if (ndev->nd_parms == NULL) {
 340                         kfree(ndev);
 341                         return NULL;
 342                 }
 343                 /* We refer to the device */
 344                 dev_hold(dev);
 345
 346                 if (snmp6_alloc_dev(ndev) < 0) {
 347                         ADBG((KERN_WARNING
 348                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
 349                                 __FUNCTION__, dev->name));
 350                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 351                         ndev->dead = 1;
 352                         in6_dev_finish_destroy(ndev);
 353                         return NULL;
 354                 }
 355
 356                 if (snmp6_register_dev(ndev) < 0) {
 357                         ADBG((KERN_WARNING
 358                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 359                                 __FUNCTION__, dev->name));
 360                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 361                         ndev->dead = 1;
 362                         in6_dev_finish_destroy(ndev);
 363                         return NULL;
 364                 }
 365
 366                 /* One reference from device.  We must do this before
 367                  * we invoke __ipv6_regen_rndid().
 368                  */
 369                 in6_dev_hold(ndev);
 370
 371 #ifdef CONFIG_IPV6_PRIVACY
 372                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
 373                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
 374                 init_timer(&ndev->regen_timer);
 375                 ndev->regen_timer.function = ipv6_regen_rndid;
 376                 ndev->regen_timer.data = (unsigned long) ndev;
 377                 if ((dev->flags&IFF_LOOPBACK) ||
 378                     dev->type == ARPHRD_TUNNEL ||
 379                     dev->type == ARPHRD_NONE ||
 380                     dev->type == ARPHRD_SIT) {
 381                         printk(KERN_INFO
 382                                 "Disabled Privacy Extensions on device %p(%s)\n",
 383                                 dev, dev->name);
 384                         ndev->cnf.use_tempaddr = -1;
 385                 } else {
 386                         in6_dev_hold(ndev);
 387                         ipv6_regen_rndid((unsigned long) ndev);
 388                 }
 389 #endif
 390
 391                 write_lock_bh(&addrconf_lock);
 392                 dev->ip6_ptr = ndev;
 393                 write_unlock_bh(&addrconf_lock);
 394
 395                 ipv6_mc_init_dev(ndev);
 396                 ndev->tstamp = jiffies;
 397 #ifdef CONFIG_SYSCTL
 398                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 399                                       NET_IPV6_NEIGH, "ipv6",
 400                                       &ndisc_ifinfo_sysctl_change,
 401                                       NULL);
 402                 addrconf_sysctl_register(ndev, &ndev->cnf);
 403 #endif
 404         }
 405         return ndev;
 406 }
 407
 408 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 409 {
 410         struct inet6_dev *idev;
 411
 412         ASSERT_RTNL();
 413
 414         if ((idev = __in6_dev_get(dev)) == NULL) {
 415                 if ((idev = ipv6_add_dev(dev)) == NULL)
 416                         return NULL;
 417         }
 418         if (dev->flags&IFF_UP)
 419                 ipv6_mc_up(idev);
 420         return idev;
 421 }
 422
 423 #ifdef CONFIG_SYSCTL
 424 static void dev_forward_change(struct inet6_dev *idev)
 425 {
 426         struct net_device *dev;
 427         struct inet6_ifaddr *ifa;
 428         struct in6_addr addr;
 429
 430         if (!idev)
 431                 return;
 432         dev = idev->dev;
 433         if (dev && (dev->flags & IFF_MULTICAST)) {
 434                 ipv6_addr_all_routers(&addr);
 435
 436                 if (idev->cnf.forwarding)
 437                         ipv6_dev_mc_inc(dev, &addr);
 438                 else
 439                         ipv6_dev_mc_dec(dev, &addr);
 440         }
 441         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 442                 if (idev->cnf.forwarding)
 443                         addrconf_join_anycast(ifa);
 444                 else
 445                         addrconf_leave_anycast(ifa);
 446         }
 447 }
 448
 449
 450 static void addrconf_forward_change(void)
 451 {
 452         struct net_device *dev;
 453         struct inet6_dev *idev;
 454
 455         read_lock(&dev_base_lock);
 456         for (dev=dev_base; dev; dev=dev->next) {
 457                 read_lock(&addrconf_lock);
 458                 idev = __in6_dev_get(dev);
 459                 if (idev) {
 460                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 461                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 462                         if (changed)
 463                                 dev_forward_change(idev);
 464                 }
 465                 read_unlock(&addrconf_lock);
 466         }
 467         read_unlock(&dev_base_lock);
 468 }
 469 #endif
 470
 471 /* Nobody refers to this ifaddr, destroy it */
 472
 473 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 474 {
 475         BUG_TRAP(ifp->if_next==NULL);
 476         BUG_TRAP(ifp->lst_next==NULL);
 477 #ifdef NET_REFCNT_DEBUG
 478         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 479 #endif
 480
 481         in6_dev_put(ifp->idev);
 482
 483         if (del_timer(&ifp->timer))
 484                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 485
 486         if (!ifp->dead) {
 487                 printk("Freeing alive inet6 address %p\n", ifp);
 488                 return;
 489         }
 490         dst_release(&ifp->rt->u.dst);
 491
 492         kfree(ifp);
 493 }
 494
 495 /* On success it returns ifp with increased reference count */
 496
 497 static struct inet6_ifaddr *
 498 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 499               int scope, u32 flags)
 500 {
 501         struct inet6_ifaddr *ifa = NULL;
 502         struct rt6_info *rt;
 503         int hash;
 504         int err = 0;
 505
 506         read_lock_bh(&addrconf_lock);
 507         if (idev->dead) {
 508                 err = -ENODEV;                  /*XXX*/
 509                 goto out2;
 510         }
 511
 512         write_lock(&addrconf_hash_lock);
 513
 514         /* Ignore adding duplicate addresses on an interface */
 515         if (ipv6_chk_same_addr(addr, idev->dev)) {
 516                 ADBG(("ipv6_add_addr: already assigned\n"));
 517                 err = -EEXIST;
 518                 goto out;
 519         }
 520
 521         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 522
 523         if (ifa == NULL) {
 524                 ADBG(("ipv6_add_addr: malloc failed\n"));
 525                 err = -ENOBUFS;
 526                 goto out;
 527         }
 528
 529         rt = addrconf_dst_alloc(idev, addr, 0);
 530         if (IS_ERR(rt)) {
 531                 err = PTR_ERR(rt);
 532                 goto out;
 533         }
 534
 535         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 536         ipv6_addr_copy(&ifa->addr, addr);
 537
 538         spin_lock_init(&ifa->lock);
 539         init_timer(&ifa->timer);
 540         ifa->timer.data = (unsigned long) ifa;
 541         ifa->scope = scope;
 542         ifa->prefix_len = pfxlen;
 543         ifa->flags = flags | IFA_F_TENTATIVE;
 544         ifa->cstamp = ifa->tstamp = jiffies;
 545
 546         ifa->idev = idev;
 547         in6_dev_hold(idev);
 548         /* For caller */
 549         in6_ifa_hold(ifa);
 550
 551         /* Add to big hash table */
 552         hash = ipv6_addr_hash(addr);
 553
 554         ifa->lst_next = inet6_addr_lst[hash];
 555         inet6_addr_lst[hash] = ifa;
 556         in6_ifa_hold(ifa);
 557         write_unlock(&addrconf_hash_lock);
 558
 559         write_lock(&idev->lock);
 560         /* Add to inet6_dev unicast addr list. */
 561         ifa->if_next = idev->addr_list;
 562         idev->addr_list = ifa;
 563
 564 #ifdef CONFIG_IPV6_PRIVACY
 565         if (ifa->flags&IFA_F_TEMPORARY) {
 566                 ifa->tmp_next = idev->tempaddr_list;
 567                 idev->tempaddr_list = ifa;
 568                 in6_ifa_hold(ifa);
 569         }
 570 #endif
 571
 572         ifa->rt = rt;
 573
 574         in6_ifa_hold(ifa);
 575         write_unlock(&idev->lock);
 576 out2:
 577         read_unlock_bh(&addrconf_lock);
 578
 579         if (likely(err == 0))
 580                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 581         else {
 582                 kfree(ifa);
 583                 ifa = ERR_PTR(err);
 584         }
 585
 586         return ifa;
 587 out:
 588         write_unlock(&addrconf_hash_lock);
 589         goto out2;
 590 }
 591
 592 /* This function wants to get referenced ifp and releases it before return */
 593
 594 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 595 {
 596         struct inet6_ifaddr *ifa, **ifap;
 597         struct inet6_dev *idev = ifp->idev;
 598         int hash;
 599         int deleted = 0, onlink = 0;
 600         unsigned long expires = jiffies;
 601
 602         hash = ipv6_addr_hash(&ifp->addr);
 603
 604         ifp->dead = 1;
 605
 606         write_lock_bh(&addrconf_hash_lock);
 607         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 608              ifap = &ifa->lst_next) {
 609                 if (ifa == ifp) {
 610                         *ifap = ifa->lst_next;
 611                         __in6_ifa_put(ifp);
 612                         ifa->lst_next = NULL;
 613                         break;
 614                 }
 615         }
 616         write_unlock_bh(&addrconf_hash_lock);
 617
 618         write_lock_bh(&idev->lock);
 619 #ifdef CONFIG_IPV6_PRIVACY
 620         if (ifp->flags&IFA_F_TEMPORARY) {
 621                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 622                      ifap = &ifa->tmp_next) {
 623                         if (ifa == ifp) {
 624                                 *ifap = ifa->tmp_next;
 625                                 if (ifp->ifpub) {
 626                                         in6_ifa_put(ifp->ifpub);
 627                                         ifp->ifpub = NULL;
 628                                 }
 629                                 __in6_ifa_put(ifp);
 630                                 ifa->tmp_next = NULL;
 631                                 break;
 632                         }
 633                 }
 634         }
 635 #endif
 636
 637         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
 638              ifap = &ifa->if_next) {
 639                 if (ifa == ifp) {
 640                         *ifap = ifa->if_next;
 641                         __in6_ifa_put(ifp);
 642                         ifa->if_next = NULL;
 643                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 644                                 break;
 645                         deleted = 1;
 646                 } else if (ifp->flags & IFA_F_PERMANENT) {
 647                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 648                                               ifp->prefix_len)) {
 649                                 if (ifa->flags & IFA_F_PERMANENT) {
 650                                         onlink = 1;
 651                                         if (deleted)
 652                                                 break;
 653                                 } else {
 654                                         unsigned long lifetime;
 655
 656                                         if (!onlink)
 657                                                 onlink = -1;
 658
 659                                         spin_lock(&ifa->lock);
 660                                         lifetime = min_t(unsigned long,
 661                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 662                                         if (time_before(expires,
 663                                                         ifa->tstamp + lifetime * HZ))
 664                                                 expires = ifa->tstamp + lifetime * HZ;
 665                                         spin_unlock(&ifa->lock);
 666                                 }
 667                         }
 668                 }
 669         }
 670         write_unlock_bh(&idev->lock);
 671
 672         ipv6_ifa_notify(RTM_DELADDR, ifp);
 673
 674         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 675
 676         addrconf_del_timer(ifp);
 677
 678         /*
 679          * Purge or update corresponding prefix
 680          *
 681          * 1) we don't purge prefix here if address was not permanent.
 682          *    prefix is managed by its own lifetime.
 683          * 2) if there're no addresses, delete prefix.
 684          * 3) if there're still other permanent address(es),
 685          *    corresponding prefix is still permanent.
 686          * 4) otherwise, update prefix lifetime to the
 687          *    longest valid lifetime among the corresponding
 688          *    addresses on the device.
 689          *    Note: subsequent RA will update lifetime.
 690          *
 691          * --yoshfuji
 692          */
 693         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 694                 struct in6_addr prefix;
 695                 struct rt6_info *rt;
 696
 697                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 698                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 699
 700                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 701                         if (onlink == 0) {
 702                                 ip6_del_rt(rt, NULL, NULL, NULL);
 703                                 rt = NULL;
 704                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 705                                 rt->rt6i_expires = expires;
 706                                 rt->rt6i_flags |= RTF_EXPIRES;
 707                         }
 708                 }
 709                 dst_release(&rt->u.dst);
 710         }
 711
 712         in6_ifa_put(ifp);
 713 }
 714
 715 #ifdef CONFIG_IPV6_PRIVACY
 716 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 717 {
 718         struct inet6_dev *idev = ifp->idev;
 719         struct in6_addr addr, *tmpaddr;
 720         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 721         int tmp_plen;
 722         int ret = 0;
 723         int max_addresses;
 724
 725         write_lock(&idev->lock);
 726         if (ift) {
 727                 spin_lock_bh(&ift->lock);
 728                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 729                 spin_unlock_bh(&ift->lock);
 730                 tmpaddr = &addr;
 731         } else {
 732                 tmpaddr = NULL;
 733         }
 734 retry:
 735         in6_dev_hold(idev);
 736         if (idev->cnf.use_tempaddr <= 0) {
 737                 write_unlock(&idev->lock);
 738                 printk(KERN_INFO
 739                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 740                 in6_dev_put(idev);
 741                 ret = -1;
 742                 goto out;
 743         }
 744         spin_lock_bh(&ifp->lock);
 745         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 746                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 747                 spin_unlock_bh(&ifp->lock);
 748                 write_unlock(&idev->lock);
 749                 printk(KERN_WARNING
 750                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 751                 in6_dev_put(idev);
 752                 ret = -1;
 753                 goto out;
 754         }
 755         in6_ifa_hold(ifp);
 756         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 757         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 758                 spin_unlock_bh(&ifp->lock);
 759                 write_unlock(&idev->lock);
 760                 printk(KERN_WARNING
 761                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 762                 in6_ifa_put(ifp);
 763                 in6_dev_put(idev);
 764                 ret = -1;
 765                 goto out;
 766         }
 767         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 768         tmp_valid_lft = min_t(__u32,
 769                               ifp->valid_lft,
 770                               idev->cnf.temp_valid_lft);
 771         tmp_prefered_lft = min_t(__u32,
 772                                  ifp->prefered_lft,
 773                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 774         tmp_plen = ifp->prefix_len;
 775         max_addresses = idev->cnf.max_addresses;
 776         tmp_cstamp = ifp->cstamp;
 777         tmp_tstamp = ifp->tstamp;
 778         spin_unlock_bh(&ifp->lock);
 779
 780         write_unlock(&idev->lock);
 781         ift = !max_addresses ||
 782               ipv6_count_addresses(idev) < max_addresses ?
 783                 ipv6_add_addr(idev, &addr, tmp_plen,
 784                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 785         if (!ift || IS_ERR(ift)) {
 786                 in6_ifa_put(ifp);
 787                 in6_dev_put(idev);
 788                 printk(KERN_INFO
 789                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 790                 tmpaddr = &addr;
 791                 write_lock(&idev->lock);
 792                 goto retry;
 793         }
 794
 795         spin_lock_bh(&ift->lock);
 796         ift->ifpub = ifp;
 797         ift->valid_lft = tmp_valid_lft;
 798         ift->prefered_lft = tmp_prefered_lft;
 799         ift->cstamp = tmp_cstamp;
 800         ift->tstamp = tmp_tstamp;
 801         spin_unlock_bh(&ift->lock);
 802
 803         addrconf_dad_start(ift, 0);
 804         in6_ifa_put(ift);
 805         in6_dev_put(idev);
 806 out:
 807         return ret;
 808 }
 809 #endif
 810
 811 /*
 812  *      Choose an appropriate source address (RFC3484)
 813  */
 814 struct ipv6_saddr_score {
 815         int             addr_type;
 816         unsigned int    attrs;
 817         int             matchlen;
 818         unsigned int    scope;
 819         unsigned int    rule;
 820 };
 821
 822 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 823 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 824 #define IPV6_SADDR_SCORE_HOA            0x0008
 825 #define IPV6_SADDR_SCORE_OIF            0x0010
 826 #define IPV6_SADDR_SCORE_LABEL          0x0020
 827 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 828
 829 static int inline ipv6_saddr_preferred(int type)
 830 {
 831         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 832                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 833                 return 1;
 834         return 0;
 835 }
 836
 837 /* static matching label */
 838 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 839 {
 840  /*
 841   *     prefix (longest match)  label
 842   *     -----------------------------
 843   *     ::1/128                 0
 844   *     ::/0                    1
 845   *     2002::/16               2
 846   *     ::/96                   3
 847   *     ::ffff:0:0/96           4
 848   */
 849         if (type & IPV6_ADDR_LOOPBACK)
 850                 return 0;
 851         else if (type & IPV6_ADDR_COMPATv4)
 852                 return 3;
 853         else if (type & IPV6_ADDR_MAPPED)
 854                 return 4;
 855         else if (addr->s6_addr16[0] == htons(0x2002))
 856                 return 2;
 857         return 1;
 858 }
 859
 860 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 861                        struct in6_addr *daddr, struct in6_addr *saddr)
 862 {
 863         struct ipv6_saddr_score hiscore;
 864         struct inet6_ifaddr *ifa_result = NULL;
 865         int daddr_type = __ipv6_addr_type(daddr);
 866         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 867         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 868         struct net_device *dev;
 869
 870         memset(&hiscore, 0, sizeof(hiscore));
 871
 872         read_lock(&dev_base_lock);
 873         read_lock(&addrconf_lock);
 874
 875         for (dev = dev_base; dev; dev=dev->next) {
 876                 struct inet6_dev *idev;
 877                 struct inet6_ifaddr *ifa;
 878
 879                 /* Rule 0: Candidate Source Address (section 4)
 880                  *  - multicast and link-local destination address,
 881                  *    the set of candidate source address MUST only
 882                  *    include addresses assigned to interfaces
 883                  *    belonging to the same link as the outgoing
 884                  *    interface.
 885                  * (- For site-local destination addresses, the
 886                  *    set of candidate source addresses MUST only
 887                  *    include addresses assigned to interfaces
 888                  *    belonging to the same site as the outgoing
 889                  *    interface.)
 890                  */
 891                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 892                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 893                     daddr_dev && dev != daddr_dev)
 894                         continue;
 895
 896                 idev = __in6_dev_get(dev);
 897                 if (!idev)
 898                         continue;
 899
 900                 read_lock_bh(&idev->lock);
 901                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 902                         struct ipv6_saddr_score score;
 903
 904                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 905
 906                         /* Rule 0: Candidate Source Address (section 4)
 907                          *  - In any case, anycast addresses, multicast
 908                          *    addresses, and the unspecified address MUST
 909                          *    NOT be included in a candidate set.
 910                          */
 911                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 912                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 913                                 LIMIT_NETDEBUG(KERN_DEBUG
 914                                                "ADDRCONF: unspecified / multicast address"
 915                                                "assigned as unicast address on %s",
 916                                                dev->name);
 917                                 continue;
 918                         }
 919
 920                         score.attrs = 0;
 921                         score.matchlen = 0;
 922                         score.scope = 0;
 923                         score.rule = 0;
 924
 925                         if (ifa_result == NULL) {
 926                                 /* record it if the first available entry */
 927                                 goto record_it;
 928                         }
 929
 930                         /* Rule 1: Prefer same address */
 931                         if (hiscore.rule < 1) {
 932                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 933                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 934                                 hiscore.rule++;
 935                         }
 936                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 937                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 938                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 939                                         score.rule = 1;
 940                                         goto record_it;
 941                                 }
 942                         } else {
 943                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 944                                         continue;
 945                         }
 946
 947                         /* Rule 2: Prefer appropriate scope */
 948                         if (hiscore.rule < 2) {
 949                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 950                                 hiscore.rule++;
 951                         }
 952                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 953                         if (hiscore.scope < score.scope) {
 954                                 if (hiscore.scope < daddr_scope) {
 955                                         score.rule = 2;
 956                                         goto record_it;
 957                                 } else
 958                                         continue;
 959                         } else if (score.scope < hiscore.scope) {
 960                                 if (score.scope < daddr_scope)
 961                                         continue;
 962                                 else {
 963                                         score.rule = 2;
 964                                         goto record_it;
 965                                 }
 966                         }
 967
 968                         /* Rule 3: Avoid deprecated address */
 969                         if (hiscore.rule < 3) {
 970                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 971                                     !(ifa_result->flags & IFA_F_DEPRECATED))
 972                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 973                                 hiscore.rule++;
 974                         }
 975                         if (ipv6_saddr_preferred(score.addr_type) ||
 976                             !(ifa->flags & IFA_F_DEPRECATED)) {
 977                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 978                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
 979                                         score.rule = 3;
 980                                         goto record_it;
 981                                 }
 982                         } else {
 983                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
 984                                         continue;
 985                         }
 986
 987                         /* Rule 4: Prefer home address -- not implemented yet */
 988
 989                         /* Rule 5: Prefer outgoing interface */
 990                         if (hiscore.rule < 5) {
 991                                 if (daddr_dev == NULL ||
 992                                     daddr_dev == ifa_result->idev->dev)
 993                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
 994                                 hiscore.rule++;
 995                         }
 996                         if (daddr_dev == NULL ||
 997                             daddr_dev == ifa->idev->dev) {
 998                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
 999                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1000                                         score.rule = 5;
1001                                         goto record_it;
1002                                 }
1003                         } else {
1004                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1005                                         continue;
1006                         }
1007
1008                         /* Rule 6: Prefer matching label */
1009                         if (hiscore.rule < 6) {
1010                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1011                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1012                                 hiscore.rule++;
1013                         }
1014                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1015                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1016                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1017                                         score.rule = 6;
1018                                         goto record_it;
1019                                 }
1020                         } else {
1021                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1022                                         continue;
1023                         }
1024
1025 #ifdef CONFIG_IPV6_PRIVACY
1026                         /* Rule 7: Prefer public address
1027                          * Note: prefer temprary address if use_tempaddr >= 2
1028                          */
1029                         if (hiscore.rule < 7) {
1030                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1031                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1032                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1033                                 hiscore.rule++;
1034                         }
1035                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1036                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1037                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1038                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1039                                         score.rule = 7;
1040                                         goto record_it;
1041                                 }
1042                         } else {
1043                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1044                                         continue;
1045                         }
1046 #endif
1047                         /* Rule 8: Use longest matching prefix */
1048                         if (hiscore.rule < 8)
1049                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1050                         score.rule++;
1051                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1052                         if (score.matchlen > hiscore.matchlen) {
1053                                 score.rule = 8;
1054                                 goto record_it;
1055                         }
1056 #if 0
1057                         else if (score.matchlen < hiscore.matchlen)
1058                                 continue;
1059 #endif
1060
1061                         /* Final Rule: choose first available one */
1062                         continue;
1063 record_it:
1064                         if (ifa_result)
1065                                 in6_ifa_put(ifa_result);
1066                         in6_ifa_hold(ifa);
1067                         ifa_result = ifa;
1068                         hiscore = score;
1069                 }
1070                 read_unlock_bh(&idev->lock);
1071         }
1072         read_unlock(&addrconf_lock);
1073         read_unlock(&dev_base_lock);
1074
1075         if (!ifa_result)
1076                 return -EADDRNOTAVAIL;
1077
1078         ipv6_addr_copy(saddr, &ifa_result->addr);
1079         in6_ifa_put(ifa_result);
1080         return 0;
1081 }
1082
1083
1084 int ipv6_get_saddr(struct dst_entry *dst,
1085                    struct in6_addr *daddr, struct in6_addr *saddr)
1086 {
1087         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1088 }
1089
1090
1091 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1092 {
1093         struct inet6_dev *idev;
1094         int err = -EADDRNOTAVAIL;
1095
1096         read_lock(&addrconf_lock);
1097         if ((idev = __in6_dev_get(dev)) != NULL) {
1098                 struct inet6_ifaddr *ifp;
1099
1100                 read_lock_bh(&idev->lock);
1101                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1102                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1103                                 ipv6_addr_copy(addr, &ifp->addr);
1104                                 err = 0;
1105                                 break;
1106                         }
1107                 }
1108                 read_unlock_bh(&idev->lock);
1109         }
1110         read_unlock(&addrconf_lock);
1111         return err;
1112 }
1113
1114 static int ipv6_count_addresses(struct inet6_dev *idev)
1115 {
1116         int cnt = 0;
1117         struct inet6_ifaddr *ifp;
1118
1119         read_lock_bh(&idev->lock);
1120         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1121                 cnt++;
1122         read_unlock_bh(&idev->lock);
1123         return cnt;
1124 }
1125
1126 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1127 {
1128         struct inet6_ifaddr * ifp;
1129         u8 hash = ipv6_addr_hash(addr);
1130
1131         read_lock_bh(&addrconf_hash_lock);
1132         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1133                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1134                     !(ifp->flags&IFA_F_TENTATIVE)) {
1135                         if (dev == NULL || ifp->idev->dev == dev ||
1136                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1137                                 break;
1138                 }
1139         }
1140         read_unlock_bh(&addrconf_hash_lock);
1141         return ifp != NULL;
1142 }
1143
1144 static
1145 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1146 {
1147         struct inet6_ifaddr * ifp;
1148         u8 hash = ipv6_addr_hash(addr);
1149
1150         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1151                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1152                         if (dev == NULL || ifp->idev->dev == dev)
1153                                 break;
1154                 }
1155         }
1156         return ifp != NULL;
1157 }
1158
1159 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1160 {
1161         struct inet6_ifaddr * ifp;
1162         u8 hash = ipv6_addr_hash(addr);
1163
1164         read_lock_bh(&addrconf_hash_lock);
1165         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1166                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1167                         if (dev == NULL || ifp->idev->dev == dev ||
1168                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1169                                 in6_ifa_hold(ifp);
1170                                 break;
1171                         }
1172                 }
1173         }
1174         read_unlock_bh(&addrconf_hash_lock);
1175
1176         return ifp;
1177 }
1178
1179 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1180 {
1181         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1182         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1183         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1184         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1185         int sk_ipv6only = ipv6_only_sock(sk);
1186         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1187         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1188         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1189
1190         if (!sk2_rcv_saddr && !sk_ipv6only)
1191                 return 1;
1192
1193         if (addr_type2 == IPV6_ADDR_ANY &&
1194             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1195                 return 1;
1196
1197         if (addr_type == IPV6_ADDR_ANY &&
1198             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1199                 return 1;
1200
1201         if (sk2_rcv_saddr6 &&
1202             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1203                 return 1;
1204
1205         if (addr_type == IPV6_ADDR_MAPPED &&
1206             !sk2_ipv6only &&
1207             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1208                 return 1;
1209
1210         return 0;
1211 }
1212
1213 /* Gets referenced address, destroys ifaddr */
1214
1215 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1216 {
1217         if (net_ratelimit())
1218                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1219         if (ifp->flags&IFA_F_PERMANENT) {
1220                 spin_lock_bh(&ifp->lock);
1221                 addrconf_del_timer(ifp);
1222                 ifp->flags |= IFA_F_TENTATIVE;
1223                 spin_unlock_bh(&ifp->lock);
1224                 in6_ifa_put(ifp);
1225 #ifdef CONFIG_IPV6_PRIVACY
1226         } else if (ifp->flags&IFA_F_TEMPORARY) {
1227                 struct inet6_ifaddr *ifpub;
1228                 spin_lock_bh(&ifp->lock);
1229                 ifpub = ifp->ifpub;
1230                 if (ifpub) {
1231                         in6_ifa_hold(ifpub);
1232                         spin_unlock_bh(&ifp->lock);
1233                         ipv6_create_tempaddr(ifpub, ifp);
1234                         in6_ifa_put(ifpub);
1235                 } else {
1236                         spin_unlock_bh(&ifp->lock);
1237                 }
1238                 ipv6_del_addr(ifp);
1239 #endif
1240         } else
1241                 ipv6_del_addr(ifp);
1242 }
1243
1244
1245 /* Join to solicited addr multicast group. */
1246
1247 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1248 {
1249         struct in6_addr maddr;
1250
1251         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1252                 return;
1253
1254         addrconf_addr_solict_mult(addr, &maddr);
1255         ipv6_dev_mc_inc(dev, &maddr);
1256 }
1257
1258 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1259 {
1260         struct in6_addr maddr;
1261
1262         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1263                 return;
1264
1265         addrconf_addr_solict_mult(addr, &maddr);
1266         __ipv6_dev_mc_dec(idev, &maddr);
1267 }
1268
1269 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1270 {
1271         struct in6_addr addr;
1272         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1273         if (ipv6_addr_any(&addr))
1274                 return;
1275         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1276 }
1277
1278 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1279 {
1280         struct in6_addr addr;
1281         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1282         if (ipv6_addr_any(&addr))
1283                 return;
1284         __ipv6_dev_ac_dec(ifp->idev, &addr);
1285 }
1286
1287 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1288 {
1289         switch (dev->type) {
1290         case ARPHRD_ETHER:
1291         case ARPHRD_FDDI:
1292         case ARPHRD_IEEE802_TR:
1293                 if (dev->addr_len != ETH_ALEN)
1294                         return -1;
1295                 memcpy(eui, dev->dev_addr, 3);
1296                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1297
1298                 /*
1299                  * The zSeries OSA network cards can be shared among various
1300                  * OS instances, but the OSA cards have only one MAC address.
1301                  * This leads to duplicate address conflicts in conjunction
1302                  * with IPv6 if more than one instance uses the same card.
1303                  *
1304                  * The driver for these cards can deliver a unique 16-bit
1305                  * identifier for each instance sharing the same card.  It is
1306                  * placed instead of 0xFFFE in the interface identifier.  The
1307                  * "u" bit of the interface identifier is not inverted in this
1308                  * case.  Hence the resulting interface identifier has local
1309                  * scope according to RFC2373.
1310                  */
1311                 if (dev->dev_id) {
1312                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1313                         eui[4] = dev->dev_id & 0xFF;
1314                 } else {
1315                         eui[3] = 0xFF;
1316                         eui[4] = 0xFE;
1317                         eui[0] ^= 2;
1318                 }
1319                 return 0;
1320         case ARPHRD_ARCNET:
1321                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1322                 if (dev->addr_len != ARCNET_ALEN)
1323                         return -1;
1324                 memset(eui, 0, 7);
1325                 eui[7] = *(u8*)dev->dev_addr;
1326                 return 0;
1327         case ARPHRD_INFINIBAND:
1328                 if (dev->addr_len != INFINIBAND_ALEN)
1329                         return -1;
1330                 memcpy(eui, dev->dev_addr + 12, 8);
1331                 eui[0] |= 2;
1332                 return 0;
1333         }
1334         return -1;
1335 }
1336
1337 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1338 {
1339         int err = -1;
1340         struct inet6_ifaddr *ifp;
1341
1342         read_lock_bh(&idev->lock);
1343         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1344                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1345                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1346                         err = 0;
1347                         break;
1348                 }
1349         }
1350         read_unlock_bh(&idev->lock);
1351         return err;
1352 }
1353
1354 #ifdef CONFIG_IPV6_PRIVACY
1355 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1356 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1357 {
1358         struct net_device *dev;
1359         struct scatterlist sg[2];
1360
1361         sg_set_buf(&sg[0], idev->entropy, 8);
1362         sg_set_buf(&sg[1], idev->work_eui64, 8);
1363
1364         dev = idev->dev;
1365
1366         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1367                 printk(KERN_INFO
1368                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1369                         idev);
1370                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1371         }
1372 regen:
1373         spin_lock(&md5_tfm_lock);
1374         if (unlikely(md5_tfm == NULL)) {
1375                 spin_unlock(&md5_tfm_lock);
1376                 return -1;
1377         }
1378         crypto_digest_init(md5_tfm);
1379         crypto_digest_update(md5_tfm, sg, 2);
1380         crypto_digest_final(md5_tfm, idev->work_digest);
1381         spin_unlock(&md5_tfm_lock);
1382
1383         memcpy(idev->rndid, &idev->work_digest[0], 8);
1384         idev->rndid[0] &= ~0x02;
1385         memcpy(idev->entropy, &idev->work_digest[8], 8);
1386
1387         /*
1388          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1389          * check if generated address is not inappropriate
1390          *
1391          *  - Reserved subnet anycast (RFC 2526)
1392          *      11111101 11....11 1xxxxxxx
1393          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1394          *      00-00-5E-FE-xx-xx-xx-xx
1395          *  - value 0
1396          *  - XXX: already assigned to an address on the device
1397          */
1398         if (idev->rndid[0] == 0xfd &&
1399             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1400             (idev->rndid[7]&0x80))
1401                 goto regen;
1402         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1403                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1404                         goto regen;
1405                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1406                         goto regen;
1407         }
1408
1409         return 0;
1410 }
1411
1412 static void ipv6_regen_rndid(unsigned long data)
1413 {
1414         struct inet6_dev *idev = (struct inet6_dev *) data;
1415         unsigned long expires;
1416
1417         read_lock_bh(&addrconf_lock);
1418         write_lock_bh(&idev->lock);
1419
1420         if (idev->dead)
1421                 goto out;
1422
1423         if (__ipv6_regen_rndid(idev) < 0)
1424                 goto out;
1425
1426         expires = jiffies +
1427                 idev->cnf.temp_prefered_lft * HZ -
1428                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1429         if (time_before(expires, jiffies)) {
1430                 printk(KERN_WARNING
1431                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1432                         idev->dev->name);
1433                 goto out;
1434         }
1435
1436         if (!mod_timer(&idev->regen_timer, expires))
1437                 in6_dev_hold(idev);
1438
1439 out:
1440         write_unlock_bh(&idev->lock);
1441         read_unlock_bh(&addrconf_lock);
1442         in6_dev_put(idev);
1443 }
1444
1445 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1446         int ret = 0;
1447
1448         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1449                 ret = __ipv6_regen_rndid(idev);
1450         return ret;
1451 }
1452 #endif
1453
1454 /*
1455  *      Add prefix route.
1456  */
1457
1458 static void
1459 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1460                       unsigned long expires, u32 flags)
1461 {
1462         struct in6_rtmsg rtmsg;
1463
1464         memset(&rtmsg, 0, sizeof(rtmsg));
1465         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1466         rtmsg.rtmsg_dst_len = plen;
1467         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1468         rtmsg.rtmsg_ifindex = dev->ifindex;
1469         rtmsg.rtmsg_info = expires;
1470         rtmsg.rtmsg_flags = RTF_UP|flags;
1471         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1472
1473         /* Prevent useless cloning on PtP SIT.
1474            This thing is done here expecting that the whole
1475            class of non-broadcast devices need not cloning.
1476          */
1477         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1478                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1479
1480         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1481 }
1482
1483 /* Create "default" multicast route to the interface */
1484
1485 static void addrconf_add_mroute(struct net_device *dev)
1486 {
1487         struct in6_rtmsg rtmsg;
1488
1489         memset(&rtmsg, 0, sizeof(rtmsg));
1490         ipv6_addr_set(&rtmsg.rtmsg_dst,
1491                       htonl(0xFF000000), 0, 0, 0);
1492         rtmsg.rtmsg_dst_len = 8;
1493         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1494         rtmsg.rtmsg_ifindex = dev->ifindex;
1495         rtmsg.rtmsg_flags = RTF_UP;
1496         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1497         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1498 }
1499
1500 static void sit_route_add(struct net_device *dev)
1501 {
1502         struct in6_rtmsg rtmsg;
1503
1504         memset(&rtmsg, 0, sizeof(rtmsg));
1505
1506         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1507         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1508
1509         /* prefix length - 96 bits "::d.d.d.d" */
1510         rtmsg.rtmsg_dst_len     = 96;
1511         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1512         rtmsg.rtmsg_ifindex     = dev->ifindex;
1513
1514         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1515 }
1516
1517 static void addrconf_add_lroute(struct net_device *dev)
1518 {
1519         struct in6_addr addr;
1520
1521         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1522         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1523 }
1524
1525 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1526 {
1527         struct inet6_dev *idev;
1528
1529         ASSERT_RTNL();
1530
1531         if ((idev = ipv6_find_idev(dev)) == NULL)
1532                 return NULL;
1533
1534         /* Add default multicast route */
1535         addrconf_add_mroute(dev);
1536
1537         /* Add link local route */
1538         addrconf_add_lroute(dev);
1539         return idev;
1540 }
1541
1542 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1543 {
1544         struct prefix_info *pinfo;
1545         __u32 valid_lft;
1546         __u32 prefered_lft;
1547         int addr_type;
1548         unsigned long rt_expires;
1549         struct inet6_dev *in6_dev;
1550
1551         pinfo = (struct prefix_info *) opt;
1552
1553         if (len < sizeof(struct prefix_info)) {
1554                 ADBG(("addrconf: prefix option too short\n"));
1555                 return;
1556         }
1557
1558         /*
1559          *      Validation checks ([ADDRCONF], page 19)
1560          */
1561
1562         addr_type = ipv6_addr_type(&pinfo->prefix);
1563
1564         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1565                 return;
1566
1567         valid_lft = ntohl(pinfo->valid);
1568         prefered_lft = ntohl(pinfo->prefered);
1569
1570         if (prefered_lft > valid_lft) {
1571                 if (net_ratelimit())
1572                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1573                 return;
1574         }
1575
1576         in6_dev = in6_dev_get(dev);
1577
1578         if (in6_dev == NULL) {
1579                 if (net_ratelimit())
1580                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1581                 return;
1582         }
1583
1584         /*
1585          *      Two things going on here:
1586          *      1) Add routes for on-link prefixes
1587          *      2) Configure prefixes with the auto flag set
1588          */
1589
1590         /* Avoid arithmetic overflow. Really, we could
1591            save rt_expires in seconds, likely valid_lft,
1592            but it would require division in fib gc, that it
1593            not good.
1594          */
1595         if (valid_lft >= 0x7FFFFFFF/HZ)
1596                 rt_expires = 0;
1597         else
1598                 rt_expires = jiffies + valid_lft * HZ;
1599
1600         if (pinfo->onlink) {
1601                 struct rt6_info *rt;
1602                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1603
1604                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1605                         if (rt->rt6i_flags&RTF_EXPIRES) {
1606                                 if (valid_lft == 0) {
1607                                         ip6_del_rt(rt, NULL, NULL, NULL);
1608                                         rt = NULL;
1609                                 } else {
1610                                         rt->rt6i_expires = rt_expires;
1611                                 }
1612                         }
1613                 } else if (valid_lft) {
1614                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1615                                               dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1616                 }
1617                 if (rt)
1618                         dst_release(&rt->u.dst);
1619         }
1620
1621         /* Try to figure out our local address for this prefix */
1622
1623         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1624                 struct inet6_ifaddr * ifp;
1625                 struct in6_addr addr;
1626                 int create = 0, update_lft = 0;
1627
1628                 if (pinfo->prefix_len == 64) {
1629                         memcpy(&addr, &pinfo->prefix, 8);
1630                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1631                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1632                                 in6_dev_put(in6_dev);
1633                                 return;
1634                         }
1635                         goto ok;
1636                 }
1637                 if (net_ratelimit())
1638                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1639                                pinfo->prefix_len);
1640                 in6_dev_put(in6_dev);
1641                 return;
1642
1643 ok:
1644
1645                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1646
1647                 if (ifp == NULL && valid_lft) {
1648                         int max_addresses = in6_dev->cnf.max_addresses;
1649
1650                         /* Do not allow to create too much of autoconfigured
1651                          * addresses; this would be too easy way to crash kernel.
1652                          */
1653                         if (!max_addresses ||
1654                             ipv6_count_addresses(in6_dev) < max_addresses)
1655                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1656                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1657
1658                         if (!ifp || IS_ERR(ifp)) {
1659                                 in6_dev_put(in6_dev);
1660                                 return;
1661                         }
1662
1663                         update_lft = create = 1;
1664                         ifp->cstamp = jiffies;
1665                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1666                 }
1667
1668                 if (ifp) {
1669                         int flags;
1670                         unsigned long now;
1671 #ifdef CONFIG_IPV6_PRIVACY
1672                         struct inet6_ifaddr *ift;
1673 #endif
1674                         u32 stored_lft;
1675
1676                         /* update lifetime (RFC2462 5.5.3 e) */
1677                         spin_lock(&ifp->lock);
1678                         now = jiffies;
1679                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1680                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1681                         else
1682                                 stored_lft = 0;
1683                         if (!update_lft && stored_lft) {
1684                                 if (valid_lft > MIN_VALID_LIFETIME ||
1685                                     valid_lft > stored_lft)
1686                                         update_lft = 1;
1687                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1688                                         /* valid_lft <= stored_lft is always true */
1689                                         /* XXX: IPsec */
1690                                         update_lft = 0;
1691                                 } else {
1692                                         valid_lft = MIN_VALID_LIFETIME;
1693                                         if (valid_lft < prefered_lft)
1694                                                 prefered_lft = valid_lft;
1695                                         update_lft = 1;
1696                                 }
1697                         }
1698
1699                         if (update_lft) {
1700                                 ifp->valid_lft = valid_lft;
1701                                 ifp->prefered_lft = prefered_lft;
1702                                 ifp->tstamp = now;
1703                                 flags = ifp->flags;
1704                                 ifp->flags &= ~IFA_F_DEPRECATED;
1705                                 spin_unlock(&ifp->lock);
1706
1707                                 if (!(flags&IFA_F_TENTATIVE))
1708                                         ipv6_ifa_notify(0, ifp);
1709                         } else
1710                                 spin_unlock(&ifp->lock);
1711
1712 #ifdef CONFIG_IPV6_PRIVACY
1713                         read_lock_bh(&in6_dev->lock);
1714                         /* update all temporary addresses in the list */
1715                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1716                                 /*
1717                                  * When adjusting the lifetimes of an existing
1718                                  * temporary address, only lower the lifetimes.
1719                                  * Implementations must not increase the
1720                                  * lifetimes of an existing temporary address
1721                                  * when processing a Prefix Information Option.
1722                                  */
1723                                 spin_lock(&ift->lock);
1724                                 flags = ift->flags;
1725                                 if (ift->valid_lft > valid_lft &&
1726                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1727                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1728                                 if (ift->prefered_lft > prefered_lft &&
1729                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1730                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1731                                 spin_unlock(&ift->lock);
1732                                 if (!(flags&IFA_F_TENTATIVE))
1733                                         ipv6_ifa_notify(0, ift);
1734                         }
1735
1736                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1737                                 /*
1738                                  * When a new public address is created as described in [ADDRCONF],
1739                                  * also create a new temporary address.
1740                                  */
1741                                 read_unlock_bh(&in6_dev->lock);
1742                                 ipv6_create_tempaddr(ifp, NULL);
1743                         } else {
1744                                 read_unlock_bh(&in6_dev->lock);
1745                         }
1746 #endif
1747                         in6_ifa_put(ifp);
1748                         addrconf_verify(0);
1749                 }
1750         }
1751         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1752         in6_dev_put(in6_dev);
1753 }
1754
1755 /*
1756  *      Set destination address.
1757  *      Special case for SIT interfaces where we create a new "virtual"
1758  *      device.
1759  */
1760 int addrconf_set_dstaddr(void __user *arg)
1761 {
1762         struct in6_ifreq ireq;
1763         struct net_device *dev;
1764         int err = -EINVAL;
1765
1766         rtnl_lock();
1767
1768         err = -EFAULT;
1769         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1770                 goto err_exit;
1771
1772         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1773
1774         err = -ENODEV;
1775         if (dev == NULL)
1776                 goto err_exit;
1777
1778         if (dev->type == ARPHRD_SIT) {
1779                 struct ifreq ifr;
1780                 mm_segment_t    oldfs;
1781                 struct ip_tunnel_parm p;
1782
1783                 err = -EADDRNOTAVAIL;
1784                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1785                         goto err_exit;
1786
1787                 memset(&p, 0, sizeof(p));
1788                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1789                 p.iph.saddr = 0;
1790                 p.iph.version = 4;
1791                 p.iph.ihl = 5;
1792                 p.iph.protocol = IPPROTO_IPV6;
1793                 p.iph.ttl = 64;
1794                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1795
1796                 oldfs = get_fs(); set_fs(KERNEL_DS);
1797                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1798                 set_fs(oldfs);
1799
1800                 if (err == 0) {
1801                         err = -ENOBUFS;
1802                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1803                                 goto err_exit;
1804                         err = dev_open(dev);
1805                 }
1806         }
1807
1808 err_exit:
1809         rtnl_unlock();
1810         return err;
1811 }
1812
1813 /*
1814  *      Manual configuration of address on an interface
1815  */
1816 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1817 {
1818         struct inet6_ifaddr *ifp;
1819         struct inet6_dev *idev;
1820         struct net_device *dev;
1821         int scope;
1822
1823         ASSERT_RTNL();
1824
1825         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1826                 return -ENODEV;
1827
1828         if (!(dev->flags&IFF_UP))
1829                 return -ENETDOWN;
1830
1831         if ((idev = addrconf_add_dev(dev)) == NULL)
1832                 return -ENOBUFS;
1833
1834         scope = ipv6_addr_scope(pfx);
1835
1836         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1837         if (!IS_ERR(ifp)) {
1838                 addrconf_dad_start(ifp, 0);
1839                 in6_ifa_put(ifp);
1840                 return 0;
1841         }
1842
1843         return PTR_ERR(ifp);
1844 }
1845
1846 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1847 {
1848         struct inet6_ifaddr *ifp;
1849         struct inet6_dev *idev;
1850         struct net_device *dev;
1851
1852         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1853                 return -ENODEV;
1854
1855         if ((idev = __in6_dev_get(dev)) == NULL)
1856                 return -ENXIO;
1857
1858         read_lock_bh(&idev->lock);
1859         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1860                 if (ifp->prefix_len == plen &&
1861                     ipv6_addr_equal(pfx, &ifp->addr)) {
1862                         in6_ifa_hold(ifp);
1863                         read_unlock_bh(&idev->lock);
1864
1865                         ipv6_del_addr(ifp);
1866
1867                         /* If the last address is deleted administratively,
1868                            disable IPv6 on this interface.
1869                          */
1870                         if (idev->addr_list == NULL)
1871                                 addrconf_ifdown(idev->dev, 1);
1872                         return 0;
1873                 }
1874         }
1875         read_unlock_bh(&idev->lock);
1876         return -EADDRNOTAVAIL;
1877 }
1878
1879
1880 int addrconf_add_ifaddr(void __user *arg)
1881 {
1882         struct in6_ifreq ireq;
1883         int err;
1884
1885         if (!capable(CAP_NET_ADMIN))
1886                 return -EPERM;
1887
1888         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1889                 return -EFAULT;
1890
1891         rtnl_lock();
1892         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1893         rtnl_unlock();
1894         return err;
1895 }
1896
1897 int addrconf_del_ifaddr(void __user *arg)
1898 {
1899         struct in6_ifreq ireq;
1900         int err;
1901
1902         if (!capable(CAP_NET_ADMIN))
1903                 return -EPERM;
1904
1905         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1906                 return -EFAULT;
1907
1908         rtnl_lock();
1909         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1910         rtnl_unlock();
1911         return err;
1912 }
1913
1914 static void sit_add_v4_addrs(struct inet6_dev *idev)
1915 {
1916         struct inet6_ifaddr * ifp;
1917         struct in6_addr addr;
1918         struct net_device *dev;
1919         int scope;
1920
1921         ASSERT_RTNL();
1922
1923         memset(&addr, 0, sizeof(struct in6_addr));
1924         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1925
1926         if (idev->dev->flags&IFF_POINTOPOINT) {
1927                 addr.s6_addr32[0] = htonl(0xfe800000);
1928                 scope = IFA_LINK;
1929         } else {
1930                 scope = IPV6_ADDR_COMPATv4;
1931         }
1932
1933         if (addr.s6_addr32[3]) {
1934                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1935                 if (!IS_ERR(ifp)) {
1936                         spin_lock_bh(&ifp->lock);
1937                         ifp->flags &= ~IFA_F_TENTATIVE;
1938                         spin_unlock_bh(&ifp->lock);
1939                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1940                         in6_ifa_put(ifp);
1941                 }
1942                 return;
1943         }
1944
1945         for (dev = dev_base; dev != NULL; dev = dev->next) {
1946                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1947                 if (in_dev && (dev->flags & IFF_UP)) {
1948                         struct in_ifaddr * ifa;
1949
1950                         int flag = scope;
1951
1952                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1953                                 int plen;
1954
1955                                 addr.s6_addr32[3] = ifa->ifa_local;
1956
1957                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1958                                         continue;
1959                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1960                                         if (idev->dev->flags&IFF_POINTOPOINT)
1961                                                 continue;
1962                                         flag |= IFA_HOST;
1963                                 }
1964                                 if (idev->dev->flags&IFF_POINTOPOINT)
1965                                         plen = 64;
1966                                 else
1967                                         plen = 96;
1968
1969                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1970                                                     IFA_F_PERMANENT);
1971                                 if (!IS_ERR(ifp)) {
1972                                         spin_lock_bh(&ifp->lock);
1973                                         ifp->flags &= ~IFA_F_TENTATIVE;
1974                                         spin_unlock_bh(&ifp->lock);
1975                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1976                                         in6_ifa_put(ifp);
1977                                 }
1978                         }
1979                 }
1980         }
1981 }
1982
1983 static void init_loopback(struct net_device *dev)
1984 {
1985         struct inet6_dev  *idev;
1986         struct inet6_ifaddr * ifp;
1987
1988         /* ::1 */
1989
1990         ASSERT_RTNL();
1991
1992         if ((idev = ipv6_find_idev(dev)) == NULL) {
1993                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1994                 return;
1995         }
1996
1997         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1998         if (!IS_ERR(ifp)) {
1999                 spin_lock_bh(&ifp->lock);
2000                 ifp->flags &= ~IFA_F_TENTATIVE;
2001                 spin_unlock_bh(&ifp->lock);
2002                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2003                 in6_ifa_put(ifp);
2004         }
2005 }
2006
2007 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2008 {
2009         struct inet6_ifaddr * ifp;
2010
2011         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2012         if (!IS_ERR(ifp)) {
2013                 addrconf_dad_start(ifp, 0);
2014                 in6_ifa_put(ifp);
2015         }
2016 }
2017
2018 static void addrconf_dev_config(struct net_device *dev)
2019 {
2020         struct in6_addr addr;
2021         struct inet6_dev    * idev;
2022
2023         ASSERT_RTNL();
2024
2025         if ((dev->type != ARPHRD_ETHER) &&
2026             (dev->type != ARPHRD_FDDI) &&
2027             (dev->type != ARPHRD_IEEE802_TR) &&
2028             (dev->type != ARPHRD_ARCNET) &&
2029             (dev->type != ARPHRD_INFINIBAND)) {
2030                 /* Alas, we support only Ethernet autoconfiguration. */
2031                 return;
2032         }
2033
2034         idev = addrconf_add_dev(dev);
2035         if (idev == NULL)
2036                 return;
2037
2038         memset(&addr, 0, sizeof(struct in6_addr));
2039         addr.s6_addr32[0] = htonl(0xFE800000);
2040
2041         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2042                 addrconf_add_linklocal(idev, &addr);
2043 }
2044
2045 static void addrconf_sit_config(struct net_device *dev)
2046 {
2047         struct inet6_dev *idev;
2048
2049         ASSERT_RTNL();
2050
2051         /*
2052          * Configure the tunnel with one of our IPv4
2053          * addresses... we should configure all of
2054          * our v4 addrs in the tunnel
2055          */
2056
2057         if ((idev = ipv6_find_idev(dev)) == NULL) {
2058                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2059                 return;
2060         }
2061
2062         sit_add_v4_addrs(idev);
2063
2064         if (dev->flags&IFF_POINTOPOINT) {
2065                 addrconf_add_mroute(dev);
2066                 addrconf_add_lroute(dev);
2067         } else
2068                 sit_route_add(dev);
2069 }
2070
2071 static inline int
2072 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2073 {
2074         struct in6_addr lladdr;
2075
2076         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2077                 addrconf_add_linklocal(idev, &lladdr);
2078                 return 0;
2079         }
2080         return -1;
2081 }
2082
2083 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2084 {
2085         struct net_device *link_dev;
2086
2087         /* first try to inherit the link-local address from the link device */
2088         if (idev->dev->iflink &&
2089             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2090                 if (!ipv6_inherit_linklocal(idev, link_dev))
2091                         return;
2092         }
2093         /* then try to inherit it from any device */
2094         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2095                 if (!ipv6_inherit_linklocal(idev, link_dev))
2096                         return;
2097         }
2098         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2099 }
2100
2101 /*
2102  * Autoconfigure tunnel with a link-local address so routing protocols,
2103  * DHCPv6, MLD etc. can be run over the virtual link
2104  */
2105
2106 static void addrconf_ip6_tnl_config(struct net_device *dev)
2107 {
2108         struct inet6_dev *idev;
2109
2110         ASSERT_RTNL();
2111
2112         if ((idev = addrconf_add_dev(dev)) == NULL) {
2113                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2114                 return;
2115         }
2116         ip6_tnl_add_linklocal(idev);
2117         addrconf_add_mroute(dev);
2118 }
2119
2120 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2121                            void * data)
2122 {
2123         struct net_device *dev = (struct net_device *) data;
2124         struct inet6_dev *idev = __in6_dev_get(dev);
2125
2126         switch(event) {
2127         case NETDEV_UP:
2128                 switch(dev->type) {
2129                 case ARPHRD_SIT:
2130                         addrconf_sit_config(dev);
2131                         break;
2132                 case ARPHRD_TUNNEL6:
2133                         addrconf_ip6_tnl_config(dev);
2134                         break;
2135                 case ARPHRD_LOOPBACK:
2136                         init_loopback(dev);
2137                         break;
2138
2139                 default:
2140                         addrconf_dev_config(dev);
2141                         break;
2142                 };
2143                 if (idev) {
2144                         /* If the MTU changed during the interface down, when the
2145                            interface up, the changed MTU must be reflected in the
2146                            idev as well as routers.
2147                          */
2148                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2149                                 rt6_mtu_change(dev, dev->mtu);
2150                                 idev->cnf.mtu6 = dev->mtu;
2151                         }
2152                         idev->tstamp = jiffies;
2153                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2154                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2155                            stop IPv6 on this interface.
2156                          */
2157                         if (dev->mtu < IPV6_MIN_MTU)
2158                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2159                 }
2160                 break;
2161
2162         case NETDEV_CHANGEMTU:
2163                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2164                         rt6_mtu_change(dev, dev->mtu);
2165                         idev->cnf.mtu6 = dev->mtu;
2166                         break;
2167                 }
2168
2169                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2170
2171         case NETDEV_DOWN:
2172         case NETDEV_UNREGISTER:
2173                 /*
2174                  *      Remove all addresses from this interface.
2175                  */
2176                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2177                 break;
2178         case NETDEV_CHANGE:
2179                 break;
2180         case NETDEV_CHANGENAME:
2181 #ifdef CONFIG_SYSCTL
2182                 if (idev) {
2183                         addrconf_sysctl_unregister(&idev->cnf);
2184                         neigh_sysctl_unregister(idev->nd_parms);
2185                         neigh_sysctl_register(dev, idev->nd_parms,
2186                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2187                                               &ndisc_ifinfo_sysctl_change,
2188                                               NULL);
2189                         addrconf_sysctl_register(idev, &idev->cnf);
2190                 }
2191 #endif
2192                 break;
2193         };
2194
2195         return NOTIFY_OK;
2196 }
2197
2198 /*
2199  *      addrconf module should be notified of a device going up
2200  */
2201 static struct notifier_block ipv6_dev_notf = {
2202         .notifier_call = addrconf_notify,
2203         .priority = 0
2204 };
2205
2206 static int addrconf_ifdown(struct net_device *dev, int how)
2207 {
2208         struct inet6_dev *idev;
2209         struct inet6_ifaddr *ifa, **bifa;
2210         int i;
2211
2212         ASSERT_RTNL();
2213
2214         if (dev == &loopback_dev && how == 1)
2215                 how = 0;
2216
2217         rt6_ifdown(dev);
2218         neigh_ifdown(&nd_tbl, dev);
2219
2220         idev = __in6_dev_get(dev);
2221         if (idev == NULL)
2222                 return -ENODEV;
2223
2224         /* Step 1: remove reference to ipv6 device from parent device.
2225                    Do not dev_put!
2226          */
2227         if (how == 1) {
2228                 write_lock_bh(&addrconf_lock);
2229                 dev->ip6_ptr = NULL;
2230                 idev->dead = 1;
2231                 write_unlock_bh(&addrconf_lock);
2232
2233                 /* Step 1.5: remove snmp6 entry */
2234                 snmp6_unregister_dev(idev);
2235
2236         }
2237
2238         /* Step 2: clear hash table */
2239         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2240                 bifa = &inet6_addr_lst[i];
2241
2242                 write_lock_bh(&addrconf_hash_lock);
2243                 while ((ifa = *bifa) != NULL) {
2244                         if (ifa->idev == idev) {
2245                                 *bifa = ifa->lst_next;
2246                                 ifa->lst_next = NULL;
2247                                 addrconf_del_timer(ifa);
2248                                 in6_ifa_put(ifa);
2249                                 continue;
2250                         }
2251                         bifa = &ifa->lst_next;
2252                 }
2253                 write_unlock_bh(&addrconf_hash_lock);
2254         }
2255
2256         write_lock_bh(&idev->lock);
2257
2258         /* Step 3: clear flags for stateless addrconf */
2259         if (how != 1)
2260                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2261
2262         /* Step 4: clear address list */
2263 #ifdef CONFIG_IPV6_PRIVACY
2264         if (how == 1 && del_timer(&idev->regen_timer))
2265                 in6_dev_put(idev);
2266
2267         /* clear tempaddr list */
2268         while ((ifa = idev->tempaddr_list) != NULL) {
2269                 idev->tempaddr_list = ifa->tmp_next;
2270                 ifa->tmp_next = NULL;
2271                 ifa->dead = 1;
2272                 write_unlock_bh(&idev->lock);
2273                 spin_lock_bh(&ifa->lock);
2274
2275                 if (ifa->ifpub) {
2276                         in6_ifa_put(ifa->ifpub);
2277                         ifa->ifpub = NULL;
2278                 }
2279                 spin_unlock_bh(&ifa->lock);
2280                 in6_ifa_put(ifa);
2281                 write_lock_bh(&idev->lock);
2282         }
2283 #endif
2284         while ((ifa = idev->addr_list) != NULL) {
2285                 idev->addr_list = ifa->if_next;
2286                 ifa->if_next = NULL;
2287                 ifa->dead = 1;
2288                 addrconf_del_timer(ifa);
2289                 write_unlock_bh(&idev->lock);
2290
2291                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2292                 in6_ifa_put(ifa);
2293
2294                 write_lock_bh(&idev->lock);
2295         }
2296         write_unlock_bh(&idev->lock);
2297
2298         /* Step 5: Discard multicast list */
2299
2300         if (how == 1)
2301                 ipv6_mc_destroy_dev(idev);
2302         else
2303                 ipv6_mc_down(idev);
2304
2305         /* Step 5: netlink notification of this interface */
2306         idev->tstamp = jiffies;
2307         inet6_ifinfo_notify(RTM_DELLINK, idev);
2308
2309         /* Shot the device (if unregistered) */
2310
2311         if (how == 1) {
2312 #ifdef CONFIG_SYSCTL
2313                 addrconf_sysctl_unregister(&idev->cnf);
2314                 neigh_sysctl_unregister(idev->nd_parms);
2315 #endif
2316                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2317                 neigh_ifdown(&nd_tbl, dev);
2318                 in6_dev_put(idev);
2319         }
2320         return 0;
2321 }
2322
2323 static void addrconf_rs_timer(unsigned long data)
2324 {
2325         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2326
2327         if (ifp->idev->cnf.forwarding)
2328                 goto out;
2329
2330         if (ifp->idev->if_flags & IF_RA_RCVD) {
2331                 /*
2332                  *      Announcement received after solicitation
2333                  *      was sent
2334                  */
2335                 goto out;
2336         }
2337
2338         spin_lock(&ifp->lock);
2339         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2340                 struct in6_addr all_routers;
2341
2342                 /* The wait after the last probe can be shorter */
2343                 addrconf_mod_timer(ifp, AC_RS,
2344                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2345                                    ifp->idev->cnf.rtr_solicit_delay :
2346                                    ifp->idev->cnf.rtr_solicit_interval);
2347                 spin_unlock(&ifp->lock);
2348
2349                 ipv6_addr_all_routers(&all_routers);
2350
2351                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2352         } else {
2353                 spin_unlock(&ifp->lock);
2354                 /*
2355                  * Note: we do not support deprecated "all on-link"
2356                  * assumption any longer.
2357                  */
2358                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2359                        ifp->idev->dev->name);
2360         }
2361
2362 out:
2363         in6_ifa_put(ifp);
2364 }
2365
2366 /*
2367  *      Duplicate Address Detection
2368  */
2369 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2370 {
2371         struct inet6_dev *idev = ifp->idev;
2372         struct net_device *dev = idev->dev;
2373         unsigned long rand_num;
2374
2375         addrconf_join_solict(dev, &ifp->addr);
2376
2377         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2378                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2379                                         flags);
2380
2381         net_srandom(ifp->addr.s6_addr32[3]);
2382         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2383
2384         read_lock_bh(&idev->lock);
2385         if (ifp->dead)
2386                 goto out;
2387         spin_lock_bh(&ifp->lock);
2388
2389         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2390             !(ifp->flags&IFA_F_TENTATIVE)) {
2391                 ifp->flags &= ~IFA_F_TENTATIVE;
2392                 spin_unlock_bh(&ifp->lock);
2393                 read_unlock_bh(&idev->lock);
2394
2395                 addrconf_dad_completed(ifp);
2396                 return;
2397         }
2398
2399         ifp->probes = idev->cnf.dad_transmits;
2400         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2401
2402         spin_unlock_bh(&ifp->lock);
2403 out:
2404         read_unlock_bh(&idev->lock);
2405 }
2406
2407 static void addrconf_dad_timer(unsigned long data)
2408 {
2409         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2410         struct inet6_dev *idev = ifp->idev;
2411         struct in6_addr unspec;
2412         struct in6_addr mcaddr;
2413
2414         read_lock_bh(&idev->lock);
2415         if (idev->dead) {
2416                 read_unlock_bh(&idev->lock);
2417                 goto out;
2418         }
2419         spin_lock_bh(&ifp->lock);
2420         if (ifp->probes == 0) {
2421                 /*
2422                  * DAD was successful
2423                  */
2424
2425                 ifp->flags &= ~IFA_F_TENTATIVE;
2426                 spin_unlock_bh(&ifp->lock);
2427                 read_unlock_bh(&idev->lock);
2428
2429                 addrconf_dad_completed(ifp);
2430
2431                 goto out;
2432         }
2433
2434         ifp->probes--;
2435         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2436         spin_unlock_bh(&ifp->lock);
2437         read_unlock_bh(&idev->lock);
2438
2439         /* send a neighbour solicitation for our addr */
2440         memset(&unspec, 0, sizeof(unspec));
2441         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2442         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2443 out:
2444         in6_ifa_put(ifp);
2445 }
2446
2447 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2448 {
2449         struct net_device *     dev = ifp->idev->dev;
2450
2451         /*
2452          *      Configure the address for reception. Now it is valid.
2453          */
2454
2455         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2456
2457         /* If added prefix is link local and forwarding is off,
2458            start sending router solicitations.
2459          */
2460
2461         if (ifp->idev->cnf.forwarding == 0 &&
2462             ifp->idev->cnf.rtr_solicits > 0 &&
2463             (dev->flags&IFF_LOOPBACK) == 0 &&
2464             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2465                 struct in6_addr all_routers;
2466
2467                 ipv6_addr_all_routers(&all_routers);
2468
2469                 /*
2470                  *      If a host as already performed a random delay
2471                  *      [...] as part of DAD [...] there is no need
2472                  *      to delay again before sending the first RS
2473                  */
2474                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2475
2476                 spin_lock_bh(&ifp->lock);
2477                 ifp->probes = 1;
2478                 ifp->idev->if_flags |= IF_RS_SENT;
2479                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2480                 spin_unlock_bh(&ifp->lock);
2481         }
2482 }
2483
2484 #ifdef CONFIG_PROC_FS
2485 struct if6_iter_state {
2486         int bucket;
2487 };
2488
2489 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2490 {
2491         struct inet6_ifaddr *ifa = NULL;
2492         struct if6_iter_state *state = seq->private;
2493
2494         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2495                 ifa = inet6_addr_lst[state->bucket];
2496                 if (ifa)
2497                         break;
2498         }
2499         return ifa;
2500 }
2501
2502 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2503 {
2504         struct if6_iter_state *state = seq->private;
2505
2506         ifa = ifa->lst_next;
2507 try_again:
2508         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2509                 ifa = inet6_addr_lst[state->bucket];
2510                 goto try_again;
2511         }
2512         return ifa;
2513 }
2514
2515 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2516 {
2517         struct inet6_ifaddr *ifa = if6_get_first(seq);
2518
2519         if (ifa)
2520                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2521                         --pos;
2522         return pos ? NULL : ifa;
2523 }
2524
2525 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2526 {
2527         read_lock_bh(&addrconf_hash_lock);
2528         return if6_get_idx(seq, *pos);
2529 }
2530
2531 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2532 {
2533         struct inet6_ifaddr *ifa;
2534
2535         ifa = if6_get_next(seq, v);
2536         ++*pos;
2537         return ifa;
2538 }
2539
2540 static void if6_seq_stop(struct seq_file *seq, void *v)
2541 {
2542         read_unlock_bh(&addrconf_hash_lock);
2543 }
2544
2545 static int if6_seq_show(struct seq_file *seq, void *v)
2546 {
2547         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2548         seq_printf(seq,
2549                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2550                    NIP6(ifp->addr),
2551                    ifp->idev->dev->ifindex,
2552                    ifp->prefix_len,
2553                    ifp->scope,
2554                    ifp->flags,
2555                    ifp->idev->dev->name);
2556         return 0;
2557 }
2558
2559 static struct seq_operations if6_seq_ops = {
2560         .start  = if6_seq_start,
2561         .next   = if6_seq_next,
2562         .show   = if6_seq_show,
2563         .stop   = if6_seq_stop,
2564 };
2565
2566 static int if6_seq_open(struct inode *inode, struct file *file)
2567 {
2568         struct seq_file *seq;
2569         int rc = -ENOMEM;
2570         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2571
2572         if (!s)
2573                 goto out;
2574         memset(s, 0, sizeof(*s));
2575
2576         rc = seq_open(file, &if6_seq_ops);
2577         if (rc)
2578                 goto out_kfree;
2579
2580         seq = file->private_data;
2581         seq->private = s;
2582 out:
2583         return rc;
2584 out_kfree:
2585         kfree(s);
2586         goto out;
2587 }
2588
2589 static struct file_operations if6_fops = {
2590         .owner          = THIS_MODULE,
2591         .open           = if6_seq_open,
2592         .read           = seq_read,
2593         .llseek         = seq_lseek,
2594         .release        = seq_release_private,
2595 };
2596
2597 int __init if6_proc_init(void)
2598 {
2599         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2600                 return -ENOMEM;
2601         return 0;
2602 }
2603
2604 void if6_proc_exit(void)
2605 {
2606         proc_net_remove("if_inet6");
2607 }
2608 #endif  /* CONFIG_PROC_FS */
2609
2610 /*
2611  *      Periodic address status verification
2612  */
2613
2614 static void addrconf_verify(unsigned long foo)
2615 {
2616         struct inet6_ifaddr *ifp;
2617         unsigned long now, next;
2618         int i;
2619
2620         spin_lock_bh(&addrconf_verify_lock);
2621         now = jiffies;
2622         next = now + ADDR_CHECK_FREQUENCY;
2623
2624         del_timer(&addr_chk_timer);
2625
2626         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2627
2628 restart:
2629                 write_lock(&addrconf_hash_lock);
2630                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2631                         unsigned long age;
2632 #ifdef CONFIG_IPV6_PRIVACY
2633                         unsigned long regen_advance;
2634 #endif
2635
2636                         if (ifp->flags & IFA_F_PERMANENT)
2637                                 continue;
2638
2639                         spin_lock(&ifp->lock);
2640                         age = (now - ifp->tstamp) / HZ;
2641
2642 #ifdef CONFIG_IPV6_PRIVACY
2643                         regen_advance = ifp->idev->cnf.regen_max_retry *
2644                                         ifp->idev->cnf.dad_transmits *
2645                                         ifp->idev->nd_parms->retrans_time / HZ;
2646 #endif
2647
2648                         if (age >= ifp->valid_lft) {
2649                                 spin_unlock(&ifp->lock);
2650                                 in6_ifa_hold(ifp);
2651                                 write_unlock(&addrconf_hash_lock);
2652                                 ipv6_del_addr(ifp);
2653                                 goto restart;
2654                         } else if (age >= ifp->prefered_lft) {
2655                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2656                                 int deprecate = 0;
2657
2658                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2659                                         deprecate = 1;
2660                                         ifp->flags |= IFA_F_DEPRECATED;
2661                                 }
2662
2663                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2664                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2665
2666                                 spin_unlock(&ifp->lock);
2667
2668                                 if (deprecate) {
2669                                         in6_ifa_hold(ifp);
2670                                         write_unlock(&addrconf_hash_lock);
2671
2672                                         ipv6_ifa_notify(0, ifp);
2673                                         in6_ifa_put(ifp);
2674                                         goto restart;
2675                                 }
2676 #ifdef CONFIG_IPV6_PRIVACY
2677                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2678                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2679                                 if (age >= ifp->prefered_lft - regen_advance) {
2680                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2681                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2682                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2683                                         if (!ifp->regen_count && ifpub) {
2684                                                 ifp->regen_count++;
2685                                                 in6_ifa_hold(ifp);
2686                                                 in6_ifa_hold(ifpub);
2687                                                 spin_unlock(&ifp->lock);
2688                                                 write_unlock(&addrconf_hash_lock);
2689                                                 ipv6_create_tempaddr(ifpub, ifp);
2690                                                 in6_ifa_put(ifpub);
2691                                                 in6_ifa_put(ifp);
2692                                                 goto restart;
2693                                         }
2694                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2695                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2696                                 spin_unlock(&ifp->lock);
2697 #endif
2698                         } else {
2699                                 /* ifp->prefered_lft <= ifp->valid_lft */
2700                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2701                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2702                                 spin_unlock(&ifp->lock);
2703                         }
2704                 }
2705                 write_unlock(&addrconf_hash_lock);
2706         }
2707
2708         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2709         add_timer(&addr_chk_timer);
2710         spin_unlock_bh(&addrconf_verify_lock);
2711 }
2712
2713 static int
2714 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2715 {
2716         struct rtattr **rta = arg;
2717         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2718         struct in6_addr *pfx;
2719
2720         pfx = NULL;
2721         if (rta[IFA_ADDRESS-1]) {
2722                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2723                         return -EINVAL;
2724                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2725         }
2726         if (rta[IFA_LOCAL-1]) {
2727                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2728                         return -EINVAL;
2729                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2730         }
2731         if (pfx == NULL)
2732                 return -EINVAL;
2733
2734         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2735 }
2736
2737 static int
2738 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2739 {
2740         struct rtattr  **rta = arg;
2741         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2742         struct in6_addr *pfx;
2743
2744         pfx = NULL;
2745         if (rta[IFA_ADDRESS-1]) {
2746                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2747                         return -EINVAL;
2748                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2749         }
2750         if (rta[IFA_LOCAL-1]) {
2751                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2752                         return -EINVAL;
2753                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2754         }
2755         if (pfx == NULL)
2756                 return -EINVAL;
2757
2758         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2759 }
2760
2761 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2762                              u32 pid, u32 seq, int event, unsigned int flags)
2763 {
2764         struct ifaddrmsg *ifm;
2765         struct nlmsghdr  *nlh;
2766         struct ifa_cacheinfo ci;
2767         unsigned char    *b = skb->tail;
2768
2769         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2770         ifm = NLMSG_DATA(nlh);
2771         ifm->ifa_family = AF_INET6;
2772         ifm->ifa_prefixlen = ifa->prefix_len;
2773         ifm->ifa_flags = ifa->flags;
2774         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2775         if (ifa->scope&IFA_HOST)
2776                 ifm->ifa_scope = RT_SCOPE_HOST;
2777         else if (ifa->scope&IFA_LINK)
2778                 ifm->ifa_scope = RT_SCOPE_LINK;
2779         else if (ifa->scope&IFA_SITE)
2780                 ifm->ifa_scope = RT_SCOPE_SITE;
2781         ifm->ifa_index = ifa->idev->dev->ifindex;
2782         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2783         if (!(ifa->flags&IFA_F_PERMANENT)) {
2784                 ci.ifa_prefered = ifa->prefered_lft;
2785                 ci.ifa_valid = ifa->valid_lft;
2786                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2787                         long tval = (jiffies - ifa->tstamp)/HZ;
2788                         ci.ifa_prefered -= tval;
2789                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2790                                 ci.ifa_valid -= tval;
2791                 }
2792         } else {
2793                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2794                 ci.ifa_valid = INFINITY_LIFE_TIME;
2795         }
2796         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2797                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2798         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2799                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2800         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2801         nlh->nlmsg_len = skb->tail - b;
2802         return skb->len;
2803
2804 nlmsg_failure:
2805 rtattr_failure:
2806         skb_trim(skb, b - skb->data);
2807         return -1;
2808 }
2809
2810 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2811                                 u32 pid, u32 seq, int event, u16 flags)
2812 {
2813         struct ifaddrmsg *ifm;
2814         struct nlmsghdr  *nlh;
2815         struct ifa_cacheinfo ci;
2816         unsigned char    *b = skb->tail;
2817
2818         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2819         ifm = NLMSG_DATA(nlh);
2820         ifm->ifa_family = AF_INET6;
2821         ifm->ifa_prefixlen = 128;
2822         ifm->ifa_flags = IFA_F_PERMANENT;
2823         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2824         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2825                 ifm->ifa_scope = RT_SCOPE_SITE;
2826         ifm->ifa_index = ifmca->idev->dev->ifindex;
2827         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2828         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2829                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2830                     * 100 / HZ);
2831         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2832                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2833                     * 100 / HZ);
2834         ci.ifa_prefered = INFINITY_LIFE_TIME;
2835         ci.ifa_valid = INFINITY_LIFE_TIME;
2836         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2837         nlh->nlmsg_len = skb->tail - b;
2838         return skb->len;
2839
2840 nlmsg_failure:
2841 rtattr_failure:
2842         skb_trim(skb, b - skb->data);
2843         return -1;
2844 }
2845
2846 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2847                                 u32 pid, u32 seq, int event, unsigned int flags)
2848 {
2849         struct ifaddrmsg *ifm;
2850         struct nlmsghdr  *nlh;
2851         struct ifa_cacheinfo ci;
2852         unsigned char    *b = skb->tail;
2853
2854         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2855         ifm = NLMSG_DATA(nlh);
2856         ifm->ifa_family = AF_INET6;
2857         ifm->ifa_prefixlen = 128;
2858         ifm->ifa_flags = IFA_F_PERMANENT;
2859         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2860         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2861                 ifm->ifa_scope = RT_SCOPE_SITE;
2862         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2863         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2864         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2865                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2866                     * 100 / HZ);
2867         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2868                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2869                     * 100 / HZ);
2870         ci.ifa_prefered = INFINITY_LIFE_TIME;
2871         ci.ifa_valid = INFINITY_LIFE_TIME;
2872         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2873         nlh->nlmsg_len = skb->tail - b;
2874         return skb->len;
2875
2876 nlmsg_failure:
2877 rtattr_failure:
2878         skb_trim(skb, b - skb->data);
2879         return -1;
2880 }
2881
2882 enum addr_type_t
2883 {
2884         UNICAST_ADDR,
2885         MULTICAST_ADDR,
2886         ANYCAST_ADDR,
2887 };
2888
2889 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2890                            enum addr_type_t type)
2891 {
2892         int idx, ip_idx;
2893         int s_idx, s_ip_idx;
2894         int err = 1;
2895         struct net_device *dev;
2896         struct inet6_dev *idev = NULL;
2897         struct inet6_ifaddr *ifa;
2898         struct ifmcaddr6 *ifmca;
2899         struct ifacaddr6 *ifaca;
2900
2901         s_idx = cb->args[0];
2902         s_ip_idx = ip_idx = cb->args[1];
2903         read_lock(&dev_base_lock);
2904
2905         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2906                 if (idx < s_idx)
2907                         continue;
2908                 if (idx > s_idx)
2909                         s_ip_idx = 0;
2910                 ip_idx = 0;
2911                 if ((idev = in6_dev_get(dev)) == NULL)
2912                         continue;
2913                 read_lock_bh(&idev->lock);
2914                 switch (type) {
2915                 case UNICAST_ADDR:
2916                         /* unicast address incl. temp addr */
2917                         for (ifa = idev->addr_list; ifa;
2918                              ifa = ifa->if_next, ip_idx++) {
2919                                 if (ip_idx < s_ip_idx)
2920                                         continue;
2921                                 if ((err = inet6_fill_ifaddr(skb, ifa,
2922                                     NETLINK_CB(cb->skb).pid,
2923                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
2924                                     NLM_F_MULTI)) <= 0)
2925                                         goto done;
2926                         }
2927                         break;
2928                 case MULTICAST_ADDR:
2929                         /* multicast address */
2930                         for (ifmca = idev->mc_list; ifmca;
2931                              ifmca = ifmca->next, ip_idx++) {
2932                                 if (ip_idx < s_ip_idx)
2933                                         continue;
2934                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2935                                     NETLINK_CB(cb->skb).pid,
2936                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2937                                     NLM_F_MULTI)) <= 0)
2938                                         goto done;
2939                         }
2940                         break;
2941                 case ANYCAST_ADDR:
2942                         /* anycast address */
2943                         for (ifaca = idev->ac_list; ifaca;
2944                              ifaca = ifaca->aca_next, ip_idx++) {
2945                                 if (ip_idx < s_ip_idx)
2946                                         continue;
2947                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2948                                     NETLINK_CB(cb->skb).pid,
2949                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2950                                     NLM_F_MULTI)) <= 0)
2951                                         goto done;
2952                         }
2953                         break;
2954                 default:
2955                         break;
2956                 }
2957                 read_unlock_bh(&idev->lock);
2958                 in6_dev_put(idev);
2959         }
2960 done:
2961         if (err <= 0) {
2962                 read_unlock_bh(&idev->lock);
2963                 in6_dev_put(idev);
2964         }
2965         read_unlock(&dev_base_lock);
2966         cb->args[0] = idx;
2967         cb->args[1] = ip_idx;
2968         return skb->len;
2969 }
2970
2971 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2972 {
2973         enum addr_type_t type = UNICAST_ADDR;
2974         return inet6_dump_addr(skb, cb, type);
2975 }
2976
2977 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2978 {
2979         enum addr_type_t type = MULTICAST_ADDR;
2980         return inet6_dump_addr(skb, cb, type);
2981 }
2982
2983
2984 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2985 {
2986         enum addr_type_t type = ANYCAST_ADDR;
2987         return inet6_dump_addr(skb, cb, type);
2988 }
2989
2990 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2991 {
2992         struct sk_buff *skb;
2993         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2994
2995         skb = alloc_skb(size, GFP_ATOMIC);
2996         if (!skb) {
2997                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
2998                 return;
2999         }
3000         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3001                 kfree_skb(skb);
3002                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3003                 return;
3004         }
3005         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3006         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3007 }
3008
3009 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3010                                 __s32 *array, int bytes)
3011 {
3012         memset(array, 0, bytes);
3013         array[DEVCONF_FORWARDING] = cnf->forwarding;
3014         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3015         array[DEVCONF_MTU6] = cnf->mtu6;
3016         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3017         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3018         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3019         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3020         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3021         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3022         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3023         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3024 #ifdef CONFIG_IPV6_PRIVACY
3025         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3026         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3027         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3028         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3029         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3030 #endif
3031         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3032 }
3033
3034 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3035                              u32 pid, u32 seq, int event, unsigned int flags)
3036 {
3037         struct net_device       *dev = idev->dev;
3038         __s32                   *array = NULL;
3039         struct ifinfomsg        *r;
3040         struct nlmsghdr         *nlh;
3041         unsigned char           *b = skb->tail;
3042         struct rtattr           *subattr;
3043         __u32                   mtu = dev->mtu;
3044         struct ifla_cacheinfo   ci;
3045
3046         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3047         r = NLMSG_DATA(nlh);
3048         r->ifi_family = AF_INET6;
3049         r->__ifi_pad = 0;
3050         r->ifi_type = dev->type;
3051         r->ifi_index = dev->ifindex;
3052         r->ifi_flags = dev_get_flags(dev);
3053         r->ifi_change = 0;
3054
3055         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3056
3057         if (dev->addr_len)
3058                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3059
3060         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3061         if (dev->ifindex != dev->iflink)
3062                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3063
3064         subattr = (struct rtattr*)skb->tail;
3065
3066         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3067
3068         /* return the device flags */
3069         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3070
3071         /* return interface cacheinfo */
3072         ci.max_reasm_len = IPV6_MAXPLEN;
3073         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3074                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3075         ci.reachable_time = idev->nd_parms->reachable_time;
3076         ci.retrans_time = idev->nd_parms->retrans_time;
3077         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3078
3079         /* return the device sysctl params */
3080         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3081                 goto rtattr_failure;
3082         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3083         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3084
3085         /* XXX - Statistics/MC not implemented */
3086         subattr->rta_len = skb->tail - (u8*)subattr;
3087
3088         nlh->nlmsg_len = skb->tail - b;
3089         kfree(array);
3090         return skb->len;
3091
3092 nlmsg_failure:
3093 rtattr_failure:
3094         kfree(array);
3095         skb_trim(skb, b - skb->data);
3096         return -1;
3097 }
3098
3099 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3100 {
3101         int idx, err;
3102         int s_idx = cb->args[0];
3103         struct net_device *dev;
3104         struct inet6_dev *idev;
3105
3106         read_lock(&dev_base_lock);
3107         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3108                 if (idx < s_idx)
3109                         continue;
3110                 if ((idev = in6_dev_get(dev)) == NULL)
3111                         continue;
3112                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3113                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3114                 in6_dev_put(idev);
3115                 if (err <= 0)
3116                         break;
3117         }
3118         read_unlock(&dev_base_lock);
3119         cb->args[0] = idx;
3120
3121         return skb->len;
3122 }
3123
3124 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3125 {
3126         struct sk_buff *skb;
3127         /* 128 bytes ?? */
3128         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3129
3130         skb = alloc_skb(size, GFP_ATOMIC);
3131         if (!skb) {
3132                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3133                 return;
3134         }
3135         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3136                 kfree_skb(skb);
3137                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3138                 return;
3139         }
3140         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3141         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3142 }
3143
3144 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3145                         struct prefix_info *pinfo, u32 pid, u32 seq,
3146                         int event, unsigned int flags)
3147 {
3148         struct prefixmsg        *pmsg;
3149         struct nlmsghdr         *nlh;
3150         unsigned char           *b = skb->tail;
3151         struct prefix_cacheinfo ci;
3152
3153         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3154         pmsg = NLMSG_DATA(nlh);
3155         pmsg->prefix_family = AF_INET6;
3156         pmsg->prefix_pad1 = 0;
3157         pmsg->prefix_pad2 = 0;
3158         pmsg->prefix_ifindex = idev->dev->ifindex;
3159         pmsg->prefix_len = pinfo->prefix_len;
3160         pmsg->prefix_type = pinfo->type;
3161         pmsg->prefix_pad3 = 0;
3162
3163         pmsg->prefix_flags = 0;
3164         if (pinfo->onlink)
3165                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3166         if (pinfo->autoconf)
3167                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3168
3169         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3170
3171         ci.preferred_time = ntohl(pinfo->prefered);
3172         ci.valid_time = ntohl(pinfo->valid);
3173         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3174
3175         nlh->nlmsg_len = skb->tail - b;
3176         return skb->len;
3177
3178 nlmsg_failure:
3179 rtattr_failure:
3180         skb_trim(skb, b - skb->data);
3181         return -1;
3182 }
3183
3184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3185                          struct prefix_info *pinfo)
3186 {
3187         struct sk_buff *skb;
3188         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3189
3190         skb = alloc_skb(size, GFP_ATOMIC);
3191         if (!skb) {
3192                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3193                 return;
3194         }
3195         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3196                 kfree_skb(skb);
3197                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3198                 return;
3199         }
3200         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3201         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3202 }
3203
3204 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3205         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3206         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3207         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3208         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3209         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3210         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3211         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3212         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3213         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3214                                       .dumpit   = inet6_dump_fib, },
3215 };
3216
3217 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3218 {
3219         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3220
3221         switch (event) {
3222         case RTM_NEWADDR:
3223                 dst_hold(&ifp->rt->u.dst);
3224                 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3225                         dst_release(&ifp->rt->u.dst);
3226                 if (ifp->idev->cnf.forwarding)
3227                         addrconf_join_anycast(ifp);
3228                 break;
3229         case RTM_DELADDR:
3230                 if (ifp->idev->cnf.forwarding)
3231                         addrconf_leave_anycast(ifp);
3232                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3233                 dst_hold(&ifp->rt->u.dst);
3234                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3235                         dst_free(&ifp->rt->u.dst);
3236                 else
3237                         dst_release(&ifp->rt->u.dst);
3238                 break;
3239         }
3240 }
3241
3242 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3243 {
3244         read_lock_bh(&addrconf_lock);
3245         if (likely(ifp->idev->dead == 0))
3246                 __ipv6_ifa_notify(event, ifp);
3247         read_unlock_bh(&addrconf_lock);
3248 }
3249
3250 #ifdef CONFIG_SYSCTL
3251
3252 static
3253 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3254                            void __user *buffer, size_t *lenp, loff_t *ppos)
3255 {
3256         int *valp = ctl->data;
3257         int val = *valp;
3258         int ret;
3259
3260         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3261
3262         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3263                 if (valp != &ipv6_devconf.forwarding) {
3264                         if ((!*valp) ^ (!val)) {
3265                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3266                                 if (idev == NULL)
3267                                         return ret;
3268                                 dev_forward_change(idev);
3269                         }
3270                 } else {
3271                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3272                         addrconf_forward_change();
3273                 }
3274                 if (*valp)
3275                         rt6_purge_dflt_routers();
3276         }
3277
3278         return ret;
3279 }
3280
3281 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3282                                             int __user *name, int nlen,
3283                                             void __user *oldval,
3284                                             size_t __user *oldlenp,
3285                                             void __user *newval, size_t newlen,
3286                                             void **context)
3287 {
3288         int *valp = table->data;
3289         int new;
3290
3291         if (!newval || !newlen)
3292                 return 0;
3293         if (newlen != sizeof(int))
3294                 return -EINVAL;
3295         if (get_user(new, (int __user *)newval))
3296                 return -EFAULT;
3297         if (new == *valp)
3298                 return 0;
3299         if (oldval && oldlenp) {
3300                 size_t len;
3301                 if (get_user(len, oldlenp))
3302                         return -EFAULT;
3303                 if (len) {
3304                         if (len > table->maxlen)
3305                                 len = table->maxlen;
3306                         if (copy_to_user(oldval, valp, len))
3307                                 return -EFAULT;
3308                         if (put_user(len, oldlenp))
3309                                 return -EFAULT;
3310                 }
3311         }
3312
3313         if (valp != &ipv6_devconf_dflt.forwarding) {
3314                 if (valp != &ipv6_devconf.forwarding) {
3315                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3316                         int changed;
3317                         if (unlikely(idev == NULL))
3318                                 return -ENODEV;
3319                         changed = (!*valp) ^ (!new);
3320                         *valp = new;
3321                         if (changed)
3322                                 dev_forward_change(idev);
3323                 } else {
3324                         *valp = new;
3325                         addrconf_forward_change();
3326                 }
3327
3328                 if (*valp)
3329                         rt6_purge_dflt_routers();
3330         } else
3331                 *valp = new;
3332
3333         return 1;
3334 }
3335
3336 static struct addrconf_sysctl_table
3337 {
3338         struct ctl_table_header *sysctl_header;
3339         ctl_table addrconf_vars[__NET_IPV6_MAX];
3340         ctl_table addrconf_dev[2];
3341         ctl_table addrconf_conf_dir[2];
3342         ctl_table addrconf_proto_dir[2];
3343         ctl_table addrconf_root_dir[2];
3344 } addrconf_sysctl = {
3345         .sysctl_header = NULL,
3346         .addrconf_vars = {
3347                 {
3348                         .ctl_name       =       NET_IPV6_FORWARDING,
3349                         .procname       =       "forwarding",
3350                         .data           =       &ipv6_devconf.forwarding,
3351                         .maxlen         =       sizeof(int),
3352                         .mode           =       0644,
3353                         .proc_handler   =       &addrconf_sysctl_forward,
3354                         .strategy       =       &addrconf_sysctl_forward_strategy,
3355                 },
3356                 {
3357                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3358                         .procname       =       "hop_limit",
3359                         .data           =       &ipv6_devconf.hop_limit,
3360                         .maxlen         =       sizeof(int),
3361                         .mode           =       0644,
3362                         .proc_handler   =       proc_dointvec,
3363                 },
3364                 {
3365                         .ctl_name       =       NET_IPV6_MTU,
3366                         .procname       =       "mtu",
3367                         .data           =       &ipv6_devconf.mtu6,
3368                         .maxlen         =       sizeof(int),
3369                         .mode           =       0644,
3370                         .proc_handler   =       &proc_dointvec,
3371                 },
3372                 {
3373                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3374                         .procname       =       "accept_ra",
3375                         .data           =       &ipv6_devconf.accept_ra,
3376                         .maxlen         =       sizeof(int),
3377                         .mode           =       0644,
3378                         .proc_handler   =       &proc_dointvec,
3379                 },
3380                 {
3381                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3382                         .procname       =       "accept_redirects",
3383                         .data           =       &ipv6_devconf.accept_redirects,
3384                         .maxlen         =       sizeof(int),
3385                         .mode           =       0644,
3386                         .proc_handler   =       &proc_dointvec,
3387                 },
3388                 {
3389                         .ctl_name       =       NET_IPV6_AUTOCONF,
3390                         .procname       =       "autoconf",
3391                         .data           =       &ipv6_devconf.autoconf,
3392                         .maxlen         =       sizeof(int),
3393                         .mode           =       0644,
3394                         .proc_handler   =       &proc_dointvec,
3395                 },
3396                 {
3397                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3398                         .procname       =       "dad_transmits",
3399                         .data           =       &ipv6_devconf.dad_transmits,
3400                         .maxlen         =       sizeof(int),
3401                         .mode           =       0644,
3402                         .proc_handler   =       &proc_dointvec,
3403                 },
3404                 {
3405                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3406                         .procname       =       "router_solicitations",
3407                         .data           =       &ipv6_devconf.rtr_solicits,
3408                         .maxlen         =       sizeof(int),
3409                         .mode           =       0644,
3410                         .proc_handler   =       &proc_dointvec,
3411                 },
3412                 {
3413                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3414                         .procname       =       "router_solicitation_interval",
3415                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3416                         .maxlen         =       sizeof(int),
3417                         .mode           =       0644,
3418                         .proc_handler   =       &proc_dointvec_jiffies,
3419                         .strategy       =       &sysctl_jiffies,
3420                 },
3421                 {
3422                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3423                         .procname       =       "router_solicitation_delay",
3424                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3425                         .maxlen         =       sizeof(int),
3426                         .mode           =       0644,
3427                         .proc_handler   =       &proc_dointvec_jiffies,
3428                         .strategy       =       &sysctl_jiffies,
3429                 },
3430                 {
3431                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3432                         .procname       =       "force_mld_version",
3433                         .data           =       &ipv6_devconf.force_mld_version,
3434                         .maxlen         =       sizeof(int),
3435                         .mode           =       0644,
3436                         .proc_handler   =       &proc_dointvec,
3437                 },
3438 #ifdef CONFIG_IPV6_PRIVACY
3439                 {
3440                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3441                         .procname       =       "use_tempaddr",
3442                         .data           =       &ipv6_devconf.use_tempaddr,
3443                         .maxlen         =       sizeof(int),
3444                         .mode           =       0644,
3445                         .proc_handler   =       &proc_dointvec,
3446                 },
3447                 {
3448                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3449                         .procname       =       "temp_valid_lft",
3450                         .data           =       &ipv6_devconf.temp_valid_lft,
3451                         .maxlen         =       sizeof(int),
3452                         .mode           =       0644,
3453                         .proc_handler   =       &proc_dointvec,
3454                 },
3455                 {
3456                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3457                         .procname       =       "temp_prefered_lft",
3458                         .data           =       &ipv6_devconf.temp_prefered_lft,
3459                         .maxlen         =       sizeof(int),
3460                         .mode           =       0644,
3461                         .proc_handler   =       &proc_dointvec,
3462                 },
3463                 {
3464                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3465                         .procname       =       "regen_max_retry",
3466                         .data           =       &ipv6_devconf.regen_max_retry,
3467                         .maxlen         =       sizeof(int),
3468                         .mode           =       0644,
3469                         .proc_handler   =       &proc_dointvec,
3470                 },
3471                 {
3472                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3473                         .procname       =       "max_desync_factor",
3474                         .data           =       &ipv6_devconf.max_desync_factor,
3475                         .maxlen         =       sizeof(int),
3476                         .mode           =       0644,
3477                         .proc_handler   =       &proc_dointvec,
3478                 },
3479 #endif
3480                 {
3481                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3482                         .procname       =       "max_addresses",
3483                         .data           =       &ipv6_devconf.max_addresses,
3484                         .maxlen         =       sizeof(int),
3485                         .mode           =       0644,
3486                         .proc_handler   =       &proc_dointvec,
3487                 },
3488                 {
3489                         .ctl_name       =       0,      /* sentinel */
3490                 }
3491         },
3492         .addrconf_dev = {
3493                 {
3494                         .ctl_name       =       NET_PROTO_CONF_ALL,
3495                         .procname       =       "all",
3496                         .mode           =       0555,
3497                         .child          =       addrconf_sysctl.addrconf_vars,
3498                 },
3499                 {
3500                         .ctl_name       =       0,      /* sentinel */
3501                 }
3502         },
3503         .addrconf_conf_dir = {
3504                 {
3505                         .ctl_name       =       NET_IPV6_CONF,
3506                         .procname       =       "conf",
3507                         .mode           =       0555,
3508                         .child          =       addrconf_sysctl.addrconf_dev,
3509                 },
3510                 {
3511                         .ctl_name       =       0,      /* sentinel */
3512                 }
3513         },
3514         .addrconf_proto_dir = {
3515                 {
3516                         .ctl_name       =       NET_IPV6,
3517                         .procname       =       "ipv6",
3518                         .mode           =       0555,
3519                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3520                 },
3521                 {
3522                         .ctl_name       =       0,      /* sentinel */
3523                 }
3524         },
3525         .addrconf_root_dir = {
3526                 {
3527                         .ctl_name       =       CTL_NET,
3528                         .procname       =       "net",
3529                         .mode           =       0555,
3530                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3531                 },
3532                 {
3533                         .ctl_name       =       0,      /* sentinel */
3534                 }
3535         },
3536 };
3537
3538 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3539 {
3540         int i;
3541         struct net_device *dev = idev ? idev->dev : NULL;
3542         struct addrconf_sysctl_table *t;
3543         char *dev_name = NULL;
3544
3545         t = kmalloc(sizeof(*t), GFP_KERNEL);
3546         if (t == NULL)
3547                 return;
3548         memcpy(t, &addrconf_sysctl, sizeof(*t));
3549         for (i=0; t->addrconf_vars[i].data; i++) {
3550                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3551                 t->addrconf_vars[i].de = NULL;
3552                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3553         }
3554         if (dev) {
3555                 dev_name = dev->name;
3556                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3557         } else {
3558                 dev_name = "default";
3559                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3560         }
3561
3562         /*
3563          * Make a copy of dev_name, because '.procname' is regarded as const
3564          * by sysctl and we wouldn't want anyone to change it under our feet
3565          * (see SIOCSIFNAME).
3566          */
3567         dev_name = kstrdup(dev_name, GFP_KERNEL);
3568         if (!dev_name)
3569             goto free;
3570
3571         t->addrconf_dev[0].procname = dev_name;
3572
3573         t->addrconf_dev[0].child = t->addrconf_vars;
3574         t->addrconf_dev[0].de = NULL;
3575         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3576         t->addrconf_conf_dir[0].de = NULL;
3577         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3578         t->addrconf_proto_dir[0].de = NULL;
3579         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3580         t->addrconf_root_dir[0].de = NULL;
3581
3582         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3583         if (t->sysctl_header == NULL)
3584                 goto free_procname;
3585         else
3586                 p->sysctl = t;
3587         return;
3588
3589         /* error path */
3590  free_procname:
3591         kfree(dev_name);
3592  free:
3593         kfree(t);
3594
3595         return;
3596 }
3597
3598 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3599 {
3600         if (p->sysctl) {
3601                 struct addrconf_sysctl_table *t = p->sysctl;
3602                 p->sysctl = NULL;
3603                 unregister_sysctl_table(t->sysctl_header);
3604                 kfree(t->addrconf_dev[0].procname);
3605                 kfree(t);
3606         }
3607 }
3608
3609
3610 #endif
3611
3612 /*
3613  *      Device notifier
3614  */
3615
3616 int register_inet6addr_notifier(struct notifier_block *nb)
3617 {
3618         return notifier_chain_register(&inet6addr_chain, nb);
3619 }
3620
3621 int unregister_inet6addr_notifier(struct notifier_block *nb)
3622 {
3623         return notifier_chain_unregister(&inet6addr_chain,nb);
3624 }
3625
3626 /*
3627  *      Init / cleanup code
3628  */
3629
3630 int __init addrconf_init(void)
3631 {
3632         int err = 0;
3633
3634         /* The addrconf netdev notifier requires that loopback_dev
3635          * has it's ipv6 private information allocated and setup
3636          * before it can bring up and give link-local addresses
3637          * to other devices which are up.
3638          *
3639          * Unfortunately, loopback_dev is not necessarily the first
3640          * entry in the global dev_base list of net devices.  In fact,
3641          * it is likely to be the very last entry on that list.
3642          * So this causes the notifier registry below to try and
3643          * give link-local addresses to all devices besides loopback_dev
3644          * first, then loopback_dev, which cases all the non-loopback_dev
3645          * devices to fail to get a link-local address.
3646          *
3647          * So, as a temporary fix, allocate the ipv6 structure for
3648          * loopback_dev first by hand.
3649          * Longer term, all of the dependencies ipv6 has upon the loopback
3650          * device and it being up should be removed.
3651          */
3652         rtnl_lock();
3653         if (!ipv6_add_dev(&loopback_dev))
3654                 err = -ENOMEM;
3655         rtnl_unlock();
3656         if (err)
3657                 return err;
3658
3659         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3660
3661         register_netdevice_notifier(&ipv6_dev_notf);
3662
3663 #ifdef CONFIG_IPV6_PRIVACY
3664         md5_tfm = crypto_alloc_tfm("md5", 0);
3665         if (unlikely(md5_tfm == NULL))
3666                 printk(KERN_WARNING
3667                         "failed to load transform for md5\n");
3668 #endif
3669
3670         addrconf_verify(0);
3671         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3672 #ifdef CONFIG_SYSCTL
3673         addrconf_sysctl.sysctl_header =
3674                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3675         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3676 #endif
3677
3678         return 0;
3679 }
3680
3681 void __exit addrconf_cleanup(void)
3682 {
3683         struct net_device *dev;
3684         struct inet6_dev *idev;
3685         struct inet6_ifaddr *ifa;
3686         int i;
3687
3688         unregister_netdevice_notifier(&ipv6_dev_notf);
3689
3690         rtnetlink_links[PF_INET6] = NULL;
3691 #ifdef CONFIG_SYSCTL
3692         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3693         addrconf_sysctl_unregister(&ipv6_devconf);
3694 #endif
3695
3696         rtnl_lock();
3697
3698         /*
3699          *      clean dev list.
3700          */
3701
3702         for (dev=dev_base; dev; dev=dev->next) {
3703                 if ((idev = __in6_dev_get(dev)) == NULL)
3704                         continue;
3705                 addrconf_ifdown(dev, 1);
3706         }
3707         addrconf_ifdown(&loopback_dev, 2);
3708
3709         /*
3710          *      Check hash table.
3711          */
3712
3713         write_lock_bh(&addrconf_hash_lock);
3714         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3715                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3716                         struct inet6_ifaddr *bifa;
3717
3718                         bifa = ifa;
3719                         ifa = ifa->lst_next;
3720                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3721                         /* Do not free it; something is wrong.
3722                            Now we can investigate it with debugger.
3723                          */
3724                 }
3725         }
3726         write_unlock_bh(&addrconf_hash_lock);
3727
3728         del_timer(&addr_chk_timer);
3729
3730         rtnl_unlock();
3731
3732 #ifdef CONFIG_IPV6_PRIVACY
3733         crypto_free_tfm(md5_tfm);
3734         md5_tfm = NULL;
3735 #endif
3736
3737 #ifdef CONFIG_PROC_FS
3738         proc_net_remove("if_inet6");
3739 #endif
3740 }