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                         if (hiscore.rule < 4)
 989                                 hiscore.rule++;
 990
 991                         /* Rule 5: Prefer outgoing interface */
 992                         if (hiscore.rule < 5) {
 993                                 if (daddr_dev == NULL ||
 994                                     daddr_dev == ifa_result->idev->dev)
 995                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
 996                                 hiscore.rule++;
 997                         }
 998                         if (daddr_dev == NULL ||
 999                             daddr_dev == ifa->idev->dev) {
1000                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1001                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1002                                         score.rule = 5;
1003                                         goto record_it;
1004                                 }
1005                         } else {
1006                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1007                                         continue;
1008                         }
1009
1010                         /* Rule 6: Prefer matching label */
1011                         if (hiscore.rule < 6) {
1012                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1013                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1014                                 hiscore.rule++;
1015                         }
1016                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1017                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1018                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1019                                         score.rule = 6;
1020                                         goto record_it;
1021                                 }
1022                         } else {
1023                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1024                                         continue;
1025                         }
1026
1027 #ifdef CONFIG_IPV6_PRIVACY
1028                         /* Rule 7: Prefer public address
1029                          * Note: prefer temprary address if use_tempaddr >= 2
1030                          */
1031                         if (hiscore.rule < 7) {
1032                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1033                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1034                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1035                                 hiscore.rule++;
1036                         }
1037                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1038                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1039                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1040                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1041                                         score.rule = 7;
1042                                         goto record_it;
1043                                 }
1044                         } else {
1045                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1046                                         continue;
1047                         }
1048 #endif
1049                         /* Rule 8: Use longest matching prefix */
1050                         if (hiscore.rule < 8) {
1051                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1052                                 hiscore.rule++;
1053                         }
1054                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1055                         if (score.matchlen > hiscore.matchlen) {
1056                                 score.rule = 8;
1057                                 goto record_it;
1058                         }
1059 #if 0
1060                         else if (score.matchlen < hiscore.matchlen)
1061                                 continue;
1062 #endif
1063
1064                         /* Final Rule: choose first available one */
1065                         continue;
1066 record_it:
1067                         if (ifa_result)
1068                                 in6_ifa_put(ifa_result);
1069                         in6_ifa_hold(ifa);
1070                         ifa_result = ifa;
1071                         hiscore = score;
1072                 }
1073                 read_unlock_bh(&idev->lock);
1074         }
1075         read_unlock(&addrconf_lock);
1076         read_unlock(&dev_base_lock);
1077
1078         if (!ifa_result)
1079                 return -EADDRNOTAVAIL;
1080
1081         ipv6_addr_copy(saddr, &ifa_result->addr);
1082         in6_ifa_put(ifa_result);
1083         return 0;
1084 }
1085
1086
1087 int ipv6_get_saddr(struct dst_entry *dst,
1088                    struct in6_addr *daddr, struct in6_addr *saddr)
1089 {
1090         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1091 }
1092
1093
1094 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1095 {
1096         struct inet6_dev *idev;
1097         int err = -EADDRNOTAVAIL;
1098
1099         read_lock(&addrconf_lock);
1100         if ((idev = __in6_dev_get(dev)) != NULL) {
1101                 struct inet6_ifaddr *ifp;
1102
1103                 read_lock_bh(&idev->lock);
1104                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1105                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1106                                 ipv6_addr_copy(addr, &ifp->addr);
1107                                 err = 0;
1108                                 break;
1109                         }
1110                 }
1111                 read_unlock_bh(&idev->lock);
1112         }
1113         read_unlock(&addrconf_lock);
1114         return err;
1115 }
1116
1117 static int ipv6_count_addresses(struct inet6_dev *idev)
1118 {
1119         int cnt = 0;
1120         struct inet6_ifaddr *ifp;
1121
1122         read_lock_bh(&idev->lock);
1123         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1124                 cnt++;
1125         read_unlock_bh(&idev->lock);
1126         return cnt;
1127 }
1128
1129 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1130 {
1131         struct inet6_ifaddr * ifp;
1132         u8 hash = ipv6_addr_hash(addr);
1133
1134         read_lock_bh(&addrconf_hash_lock);
1135         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1136                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1137                     !(ifp->flags&IFA_F_TENTATIVE)) {
1138                         if (dev == NULL || ifp->idev->dev == dev ||
1139                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1140                                 break;
1141                 }
1142         }
1143         read_unlock_bh(&addrconf_hash_lock);
1144         return ifp != NULL;
1145 }
1146
1147 static
1148 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1149 {
1150         struct inet6_ifaddr * ifp;
1151         u8 hash = ipv6_addr_hash(addr);
1152
1153         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1154                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1155                         if (dev == NULL || ifp->idev->dev == dev)
1156                                 break;
1157                 }
1158         }
1159         return ifp != NULL;
1160 }
1161
1162 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1163 {
1164         struct inet6_ifaddr * ifp;
1165         u8 hash = ipv6_addr_hash(addr);
1166
1167         read_lock_bh(&addrconf_hash_lock);
1168         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1169                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1170                         if (dev == NULL || ifp->idev->dev == dev ||
1171                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1172                                 in6_ifa_hold(ifp);
1173                                 break;
1174                         }
1175                 }
1176         }
1177         read_unlock_bh(&addrconf_hash_lock);
1178
1179         return ifp;
1180 }
1181
1182 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1183 {
1184         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1185         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1186         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1187         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1188         int sk_ipv6only = ipv6_only_sock(sk);
1189         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1190         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1191         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1192
1193         if (!sk2_rcv_saddr && !sk_ipv6only)
1194                 return 1;
1195
1196         if (addr_type2 == IPV6_ADDR_ANY &&
1197             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1198                 return 1;
1199
1200         if (addr_type == IPV6_ADDR_ANY &&
1201             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1202                 return 1;
1203
1204         if (sk2_rcv_saddr6 &&
1205             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1206                 return 1;
1207
1208         if (addr_type == IPV6_ADDR_MAPPED &&
1209             !sk2_ipv6only &&
1210             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1211                 return 1;
1212
1213         return 0;
1214 }
1215
1216 /* Gets referenced address, destroys ifaddr */
1217
1218 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1219 {
1220         if (net_ratelimit())
1221                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1222         if (ifp->flags&IFA_F_PERMANENT) {
1223                 spin_lock_bh(&ifp->lock);
1224                 addrconf_del_timer(ifp);
1225                 ifp->flags |= IFA_F_TENTATIVE;
1226                 spin_unlock_bh(&ifp->lock);
1227                 in6_ifa_put(ifp);
1228 #ifdef CONFIG_IPV6_PRIVACY
1229         } else if (ifp->flags&IFA_F_TEMPORARY) {
1230                 struct inet6_ifaddr *ifpub;
1231                 spin_lock_bh(&ifp->lock);
1232                 ifpub = ifp->ifpub;
1233                 if (ifpub) {
1234                         in6_ifa_hold(ifpub);
1235                         spin_unlock_bh(&ifp->lock);
1236                         ipv6_create_tempaddr(ifpub, ifp);
1237                         in6_ifa_put(ifpub);
1238                 } else {
1239                         spin_unlock_bh(&ifp->lock);
1240                 }
1241                 ipv6_del_addr(ifp);
1242 #endif
1243         } else
1244                 ipv6_del_addr(ifp);
1245 }
1246
1247
1248 /* Join to solicited addr multicast group. */
1249
1250 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1251 {
1252         struct in6_addr maddr;
1253
1254         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1255                 return;
1256
1257         addrconf_addr_solict_mult(addr, &maddr);
1258         ipv6_dev_mc_inc(dev, &maddr);
1259 }
1260
1261 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1262 {
1263         struct in6_addr maddr;
1264
1265         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1266                 return;
1267
1268         addrconf_addr_solict_mult(addr, &maddr);
1269         __ipv6_dev_mc_dec(idev, &maddr);
1270 }
1271
1272 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1273 {
1274         struct in6_addr addr;
1275         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1276         if (ipv6_addr_any(&addr))
1277                 return;
1278         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1279 }
1280
1281 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1282 {
1283         struct in6_addr addr;
1284         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1285         if (ipv6_addr_any(&addr))
1286                 return;
1287         __ipv6_dev_ac_dec(ifp->idev, &addr);
1288 }
1289
1290 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1291 {
1292         switch (dev->type) {
1293         case ARPHRD_ETHER:
1294         case ARPHRD_FDDI:
1295         case ARPHRD_IEEE802_TR:
1296                 if (dev->addr_len != ETH_ALEN)
1297                         return -1;
1298                 memcpy(eui, dev->dev_addr, 3);
1299                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1300
1301                 /*
1302                  * The zSeries OSA network cards can be shared among various
1303                  * OS instances, but the OSA cards have only one MAC address.
1304                  * This leads to duplicate address conflicts in conjunction
1305                  * with IPv6 if more than one instance uses the same card.
1306                  *
1307                  * The driver for these cards can deliver a unique 16-bit
1308                  * identifier for each instance sharing the same card.  It is
1309                  * placed instead of 0xFFFE in the interface identifier.  The
1310                  * "u" bit of the interface identifier is not inverted in this
1311                  * case.  Hence the resulting interface identifier has local
1312                  * scope according to RFC2373.
1313                  */
1314                 if (dev->dev_id) {
1315                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1316                         eui[4] = dev->dev_id & 0xFF;
1317                 } else {
1318                         eui[3] = 0xFF;
1319                         eui[4] = 0xFE;
1320                         eui[0] ^= 2;
1321                 }
1322                 return 0;
1323         case ARPHRD_ARCNET:
1324                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1325                 if (dev->addr_len != ARCNET_ALEN)
1326                         return -1;
1327                 memset(eui, 0, 7);
1328                 eui[7] = *(u8*)dev->dev_addr;
1329                 return 0;
1330         case ARPHRD_INFINIBAND:
1331                 if (dev->addr_len != INFINIBAND_ALEN)
1332                         return -1;
1333                 memcpy(eui, dev->dev_addr + 12, 8);
1334                 eui[0] |= 2;
1335                 return 0;
1336         }
1337         return -1;
1338 }
1339
1340 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1341 {
1342         int err = -1;
1343         struct inet6_ifaddr *ifp;
1344
1345         read_lock_bh(&idev->lock);
1346         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1347                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1348                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1349                         err = 0;
1350                         break;
1351                 }
1352         }
1353         read_unlock_bh(&idev->lock);
1354         return err;
1355 }
1356
1357 #ifdef CONFIG_IPV6_PRIVACY
1358 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1359 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1360 {
1361         struct net_device *dev;
1362         struct scatterlist sg[2];
1363
1364         sg_set_buf(&sg[0], idev->entropy, 8);
1365         sg_set_buf(&sg[1], idev->work_eui64, 8);
1366
1367         dev = idev->dev;
1368
1369         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1370                 printk(KERN_INFO
1371                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1372                         idev);
1373                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1374         }
1375 regen:
1376         spin_lock(&md5_tfm_lock);
1377         if (unlikely(md5_tfm == NULL)) {
1378                 spin_unlock(&md5_tfm_lock);
1379                 return -1;
1380         }
1381         crypto_digest_init(md5_tfm);
1382         crypto_digest_update(md5_tfm, sg, 2);
1383         crypto_digest_final(md5_tfm, idev->work_digest);
1384         spin_unlock(&md5_tfm_lock);
1385
1386         memcpy(idev->rndid, &idev->work_digest[0], 8);
1387         idev->rndid[0] &= ~0x02;
1388         memcpy(idev->entropy, &idev->work_digest[8], 8);
1389
1390         /*
1391          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1392          * check if generated address is not inappropriate
1393          *
1394          *  - Reserved subnet anycast (RFC 2526)
1395          *      11111101 11....11 1xxxxxxx
1396          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1397          *      00-00-5E-FE-xx-xx-xx-xx
1398          *  - value 0
1399          *  - XXX: already assigned to an address on the device
1400          */
1401         if (idev->rndid[0] == 0xfd &&
1402             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1403             (idev->rndid[7]&0x80))
1404                 goto regen;
1405         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1406                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1407                         goto regen;
1408                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1409                         goto regen;
1410         }
1411
1412         return 0;
1413 }
1414
1415 static void ipv6_regen_rndid(unsigned long data)
1416 {
1417         struct inet6_dev *idev = (struct inet6_dev *) data;
1418         unsigned long expires;
1419
1420         read_lock_bh(&addrconf_lock);
1421         write_lock_bh(&idev->lock);
1422
1423         if (idev->dead)
1424                 goto out;
1425
1426         if (__ipv6_regen_rndid(idev) < 0)
1427                 goto out;
1428
1429         expires = jiffies +
1430                 idev->cnf.temp_prefered_lft * HZ -
1431                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1432         if (time_before(expires, jiffies)) {
1433                 printk(KERN_WARNING
1434                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1435                         idev->dev->name);
1436                 goto out;
1437         }
1438
1439         if (!mod_timer(&idev->regen_timer, expires))
1440                 in6_dev_hold(idev);
1441
1442 out:
1443         write_unlock_bh(&idev->lock);
1444         read_unlock_bh(&addrconf_lock);
1445         in6_dev_put(idev);
1446 }
1447
1448 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1449         int ret = 0;
1450
1451         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1452                 ret = __ipv6_regen_rndid(idev);
1453         return ret;
1454 }
1455 #endif
1456
1457 /*
1458  *      Add prefix route.
1459  */
1460
1461 static void
1462 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1463                       unsigned long expires, u32 flags)
1464 {
1465         struct in6_rtmsg rtmsg;
1466
1467         memset(&rtmsg, 0, sizeof(rtmsg));
1468         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1469         rtmsg.rtmsg_dst_len = plen;
1470         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1471         rtmsg.rtmsg_ifindex = dev->ifindex;
1472         rtmsg.rtmsg_info = expires;
1473         rtmsg.rtmsg_flags = RTF_UP|flags;
1474         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1475
1476         /* Prevent useless cloning on PtP SIT.
1477            This thing is done here expecting that the whole
1478            class of non-broadcast devices need not cloning.
1479          */
1480         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1481                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1482
1483         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1484 }
1485
1486 /* Create "default" multicast route to the interface */
1487
1488 static void addrconf_add_mroute(struct net_device *dev)
1489 {
1490         struct in6_rtmsg rtmsg;
1491
1492         memset(&rtmsg, 0, sizeof(rtmsg));
1493         ipv6_addr_set(&rtmsg.rtmsg_dst,
1494                       htonl(0xFF000000), 0, 0, 0);
1495         rtmsg.rtmsg_dst_len = 8;
1496         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1497         rtmsg.rtmsg_ifindex = dev->ifindex;
1498         rtmsg.rtmsg_flags = RTF_UP;
1499         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1500         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1501 }
1502
1503 static void sit_route_add(struct net_device *dev)
1504 {
1505         struct in6_rtmsg rtmsg;
1506
1507         memset(&rtmsg, 0, sizeof(rtmsg));
1508
1509         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1510         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1511
1512         /* prefix length - 96 bits "::d.d.d.d" */
1513         rtmsg.rtmsg_dst_len     = 96;
1514         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1515         rtmsg.rtmsg_ifindex     = dev->ifindex;
1516
1517         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1518 }
1519
1520 static void addrconf_add_lroute(struct net_device *dev)
1521 {
1522         struct in6_addr addr;
1523
1524         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1525         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1526 }
1527
1528 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1529 {
1530         struct inet6_dev *idev;
1531
1532         ASSERT_RTNL();
1533
1534         if ((idev = ipv6_find_idev(dev)) == NULL)
1535                 return NULL;
1536
1537         /* Add default multicast route */
1538         addrconf_add_mroute(dev);
1539
1540         /* Add link local route */
1541         addrconf_add_lroute(dev);
1542         return idev;
1543 }
1544
1545 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1546 {
1547         struct prefix_info *pinfo;
1548         __u32 valid_lft;
1549         __u32 prefered_lft;
1550         int addr_type;
1551         unsigned long rt_expires;
1552         struct inet6_dev *in6_dev;
1553
1554         pinfo = (struct prefix_info *) opt;
1555
1556         if (len < sizeof(struct prefix_info)) {
1557                 ADBG(("addrconf: prefix option too short\n"));
1558                 return;
1559         }
1560
1561         /*
1562          *      Validation checks ([ADDRCONF], page 19)
1563          */
1564
1565         addr_type = ipv6_addr_type(&pinfo->prefix);
1566
1567         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1568                 return;
1569
1570         valid_lft = ntohl(pinfo->valid);
1571         prefered_lft = ntohl(pinfo->prefered);
1572
1573         if (prefered_lft > valid_lft) {
1574                 if (net_ratelimit())
1575                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1576                 return;
1577         }
1578
1579         in6_dev = in6_dev_get(dev);
1580
1581         if (in6_dev == NULL) {
1582                 if (net_ratelimit())
1583                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1584                 return;
1585         }
1586
1587         /*
1588          *      Two things going on here:
1589          *      1) Add routes for on-link prefixes
1590          *      2) Configure prefixes with the auto flag set
1591          */
1592
1593         /* Avoid arithmetic overflow. Really, we could
1594            save rt_expires in seconds, likely valid_lft,
1595            but it would require division in fib gc, that it
1596            not good.
1597          */
1598         if (valid_lft >= 0x7FFFFFFF/HZ)
1599                 rt_expires = 0;
1600         else
1601                 rt_expires = jiffies + valid_lft * HZ;
1602
1603         if (pinfo->onlink) {
1604                 struct rt6_info *rt;
1605                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1606
1607                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1608                         if (rt->rt6i_flags&RTF_EXPIRES) {
1609                                 if (valid_lft == 0) {
1610                                         ip6_del_rt(rt, NULL, NULL, NULL);
1611                                         rt = NULL;
1612                                 } else {
1613                                         rt->rt6i_expires = rt_expires;
1614                                 }
1615                         }
1616                 } else if (valid_lft) {
1617                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1618                                               dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1619                 }
1620                 if (rt)
1621                         dst_release(&rt->u.dst);
1622         }
1623
1624         /* Try to figure out our local address for this prefix */
1625
1626         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1627                 struct inet6_ifaddr * ifp;
1628                 struct in6_addr addr;
1629                 int create = 0, update_lft = 0;
1630
1631                 if (pinfo->prefix_len == 64) {
1632                         memcpy(&addr, &pinfo->prefix, 8);
1633                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1634                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1635                                 in6_dev_put(in6_dev);
1636                                 return;
1637                         }
1638                         goto ok;
1639                 }
1640                 if (net_ratelimit())
1641                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1642                                pinfo->prefix_len);
1643                 in6_dev_put(in6_dev);
1644                 return;
1645
1646 ok:
1647
1648                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1649
1650                 if (ifp == NULL && valid_lft) {
1651                         int max_addresses = in6_dev->cnf.max_addresses;
1652
1653                         /* Do not allow to create too much of autoconfigured
1654                          * addresses; this would be too easy way to crash kernel.
1655                          */
1656                         if (!max_addresses ||
1657                             ipv6_count_addresses(in6_dev) < max_addresses)
1658                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1659                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1660
1661                         if (!ifp || IS_ERR(ifp)) {
1662                                 in6_dev_put(in6_dev);
1663                                 return;
1664                         }
1665
1666                         update_lft = create = 1;
1667                         ifp->cstamp = jiffies;
1668                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1669                 }
1670
1671                 if (ifp) {
1672                         int flags;
1673                         unsigned long now;
1674 #ifdef CONFIG_IPV6_PRIVACY
1675                         struct inet6_ifaddr *ift;
1676 #endif
1677                         u32 stored_lft;
1678
1679                         /* update lifetime (RFC2462 5.5.3 e) */
1680                         spin_lock(&ifp->lock);
1681                         now = jiffies;
1682                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1683                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1684                         else
1685                                 stored_lft = 0;
1686                         if (!update_lft && stored_lft) {
1687                                 if (valid_lft > MIN_VALID_LIFETIME ||
1688                                     valid_lft > stored_lft)
1689                                         update_lft = 1;
1690                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1691                                         /* valid_lft <= stored_lft is always true */
1692                                         /* XXX: IPsec */
1693                                         update_lft = 0;
1694                                 } else {
1695                                         valid_lft = MIN_VALID_LIFETIME;
1696                                         if (valid_lft < prefered_lft)
1697                                                 prefered_lft = valid_lft;
1698                                         update_lft = 1;
1699                                 }
1700                         }
1701
1702                         if (update_lft) {
1703                                 ifp->valid_lft = valid_lft;
1704                                 ifp->prefered_lft = prefered_lft;
1705                                 ifp->tstamp = now;
1706                                 flags = ifp->flags;
1707                                 ifp->flags &= ~IFA_F_DEPRECATED;
1708                                 spin_unlock(&ifp->lock);
1709
1710                                 if (!(flags&IFA_F_TENTATIVE))
1711                                         ipv6_ifa_notify(0, ifp);
1712                         } else
1713                                 spin_unlock(&ifp->lock);
1714
1715 #ifdef CONFIG_IPV6_PRIVACY
1716                         read_lock_bh(&in6_dev->lock);
1717                         /* update all temporary addresses in the list */
1718                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1719                                 /*
1720                                  * When adjusting the lifetimes of an existing
1721                                  * temporary address, only lower the lifetimes.
1722                                  * Implementations must not increase the
1723                                  * lifetimes of an existing temporary address
1724                                  * when processing a Prefix Information Option.
1725                                  */
1726                                 spin_lock(&ift->lock);
1727                                 flags = ift->flags;
1728                                 if (ift->valid_lft > valid_lft &&
1729                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1730                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1731                                 if (ift->prefered_lft > prefered_lft &&
1732                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1733                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1734                                 spin_unlock(&ift->lock);
1735                                 if (!(flags&IFA_F_TENTATIVE))
1736                                         ipv6_ifa_notify(0, ift);
1737                         }
1738
1739                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1740                                 /*
1741                                  * When a new public address is created as described in [ADDRCONF],
1742                                  * also create a new temporary address.
1743                                  */
1744                                 read_unlock_bh(&in6_dev->lock);
1745                                 ipv6_create_tempaddr(ifp, NULL);
1746                         } else {
1747                                 read_unlock_bh(&in6_dev->lock);
1748                         }
1749 #endif
1750                         in6_ifa_put(ifp);
1751                         addrconf_verify(0);
1752                 }
1753         }
1754         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1755         in6_dev_put(in6_dev);
1756 }
1757
1758 /*
1759  *      Set destination address.
1760  *      Special case for SIT interfaces where we create a new "virtual"
1761  *      device.
1762  */
1763 int addrconf_set_dstaddr(void __user *arg)
1764 {
1765         struct in6_ifreq ireq;
1766         struct net_device *dev;
1767         int err = -EINVAL;
1768
1769         rtnl_lock();
1770
1771         err = -EFAULT;
1772         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1773                 goto err_exit;
1774
1775         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1776
1777         err = -ENODEV;
1778         if (dev == NULL)
1779                 goto err_exit;
1780
1781         if (dev->type == ARPHRD_SIT) {
1782                 struct ifreq ifr;
1783                 mm_segment_t    oldfs;
1784                 struct ip_tunnel_parm p;
1785
1786                 err = -EADDRNOTAVAIL;
1787                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1788                         goto err_exit;
1789
1790                 memset(&p, 0, sizeof(p));
1791                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1792                 p.iph.saddr = 0;
1793                 p.iph.version = 4;
1794                 p.iph.ihl = 5;
1795                 p.iph.protocol = IPPROTO_IPV6;
1796                 p.iph.ttl = 64;
1797                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1798
1799                 oldfs = get_fs(); set_fs(KERNEL_DS);
1800                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1801                 set_fs(oldfs);
1802
1803                 if (err == 0) {
1804                         err = -ENOBUFS;
1805                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1806                                 goto err_exit;
1807                         err = dev_open(dev);
1808                 }
1809         }
1810
1811 err_exit:
1812         rtnl_unlock();
1813         return err;
1814 }
1815
1816 /*
1817  *      Manual configuration of address on an interface
1818  */
1819 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1820 {
1821         struct inet6_ifaddr *ifp;
1822         struct inet6_dev *idev;
1823         struct net_device *dev;
1824         int scope;
1825
1826         ASSERT_RTNL();
1827
1828         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1829                 return -ENODEV;
1830
1831         if (!(dev->flags&IFF_UP))
1832                 return -ENETDOWN;
1833
1834         if ((idev = addrconf_add_dev(dev)) == NULL)
1835                 return -ENOBUFS;
1836
1837         scope = ipv6_addr_scope(pfx);
1838
1839         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1840         if (!IS_ERR(ifp)) {
1841                 addrconf_dad_start(ifp, 0);
1842                 in6_ifa_put(ifp);
1843                 return 0;
1844         }
1845
1846         return PTR_ERR(ifp);
1847 }
1848
1849 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1850 {
1851         struct inet6_ifaddr *ifp;
1852         struct inet6_dev *idev;
1853         struct net_device *dev;
1854
1855         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1856                 return -ENODEV;
1857
1858         if ((idev = __in6_dev_get(dev)) == NULL)
1859                 return -ENXIO;
1860
1861         read_lock_bh(&idev->lock);
1862         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1863                 if (ifp->prefix_len == plen &&
1864                     ipv6_addr_equal(pfx, &ifp->addr)) {
1865                         in6_ifa_hold(ifp);
1866                         read_unlock_bh(&idev->lock);
1867
1868                         ipv6_del_addr(ifp);
1869
1870                         /* If the last address is deleted administratively,
1871                            disable IPv6 on this interface.
1872                          */
1873                         if (idev->addr_list == NULL)
1874                                 addrconf_ifdown(idev->dev, 1);
1875                         return 0;
1876                 }
1877         }
1878         read_unlock_bh(&idev->lock);
1879         return -EADDRNOTAVAIL;
1880 }
1881
1882
1883 int addrconf_add_ifaddr(void __user *arg)
1884 {
1885         struct in6_ifreq ireq;
1886         int err;
1887
1888         if (!capable(CAP_NET_ADMIN))
1889                 return -EPERM;
1890
1891         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1892                 return -EFAULT;
1893
1894         rtnl_lock();
1895         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1896         rtnl_unlock();
1897         return err;
1898 }
1899
1900 int addrconf_del_ifaddr(void __user *arg)
1901 {
1902         struct in6_ifreq ireq;
1903         int err;
1904
1905         if (!capable(CAP_NET_ADMIN))
1906                 return -EPERM;
1907
1908         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1909                 return -EFAULT;
1910
1911         rtnl_lock();
1912         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1913         rtnl_unlock();
1914         return err;
1915 }
1916
1917 static void sit_add_v4_addrs(struct inet6_dev *idev)
1918 {
1919         struct inet6_ifaddr * ifp;
1920         struct in6_addr addr;
1921         struct net_device *dev;
1922         int scope;
1923
1924         ASSERT_RTNL();
1925
1926         memset(&addr, 0, sizeof(struct in6_addr));
1927         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1928
1929         if (idev->dev->flags&IFF_POINTOPOINT) {
1930                 addr.s6_addr32[0] = htonl(0xfe800000);
1931                 scope = IFA_LINK;
1932         } else {
1933                 scope = IPV6_ADDR_COMPATv4;
1934         }
1935
1936         if (addr.s6_addr32[3]) {
1937                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1938                 if (!IS_ERR(ifp)) {
1939                         spin_lock_bh(&ifp->lock);
1940                         ifp->flags &= ~IFA_F_TENTATIVE;
1941                         spin_unlock_bh(&ifp->lock);
1942                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1943                         in6_ifa_put(ifp);
1944                 }
1945                 return;
1946         }
1947
1948         for (dev = dev_base; dev != NULL; dev = dev->next) {
1949                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1950                 if (in_dev && (dev->flags & IFF_UP)) {
1951                         struct in_ifaddr * ifa;
1952
1953                         int flag = scope;
1954
1955                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1956                                 int plen;
1957
1958                                 addr.s6_addr32[3] = ifa->ifa_local;
1959
1960                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1961                                         continue;
1962                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1963                                         if (idev->dev->flags&IFF_POINTOPOINT)
1964                                                 continue;
1965                                         flag |= IFA_HOST;
1966                                 }
1967                                 if (idev->dev->flags&IFF_POINTOPOINT)
1968                                         plen = 64;
1969                                 else
1970                                         plen = 96;
1971
1972                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1973                                                     IFA_F_PERMANENT);
1974                                 if (!IS_ERR(ifp)) {
1975                                         spin_lock_bh(&ifp->lock);
1976                                         ifp->flags &= ~IFA_F_TENTATIVE;
1977                                         spin_unlock_bh(&ifp->lock);
1978                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1979                                         in6_ifa_put(ifp);
1980                                 }
1981                         }
1982                 }
1983         }
1984 }
1985
1986 static void init_loopback(struct net_device *dev)
1987 {
1988         struct inet6_dev  *idev;
1989         struct inet6_ifaddr * ifp;
1990
1991         /* ::1 */
1992
1993         ASSERT_RTNL();
1994
1995         if ((idev = ipv6_find_idev(dev)) == NULL) {
1996                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1997                 return;
1998         }
1999
2000         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2001         if (!IS_ERR(ifp)) {
2002                 spin_lock_bh(&ifp->lock);
2003                 ifp->flags &= ~IFA_F_TENTATIVE;
2004                 spin_unlock_bh(&ifp->lock);
2005                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2006                 in6_ifa_put(ifp);
2007         }
2008 }
2009
2010 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2011 {
2012         struct inet6_ifaddr * ifp;
2013
2014         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2015         if (!IS_ERR(ifp)) {
2016                 addrconf_dad_start(ifp, 0);
2017                 in6_ifa_put(ifp);
2018         }
2019 }
2020
2021 static void addrconf_dev_config(struct net_device *dev)
2022 {
2023         struct in6_addr addr;
2024         struct inet6_dev    * idev;
2025
2026         ASSERT_RTNL();
2027
2028         if ((dev->type != ARPHRD_ETHER) &&
2029             (dev->type != ARPHRD_FDDI) &&
2030             (dev->type != ARPHRD_IEEE802_TR) &&
2031             (dev->type != ARPHRD_ARCNET) &&
2032             (dev->type != ARPHRD_INFINIBAND)) {
2033                 /* Alas, we support only Ethernet autoconfiguration. */
2034                 return;
2035         }
2036
2037         idev = addrconf_add_dev(dev);
2038         if (idev == NULL)
2039                 return;
2040
2041         memset(&addr, 0, sizeof(struct in6_addr));
2042         addr.s6_addr32[0] = htonl(0xFE800000);
2043
2044         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2045                 addrconf_add_linklocal(idev, &addr);
2046 }
2047
2048 static void addrconf_sit_config(struct net_device *dev)
2049 {
2050         struct inet6_dev *idev;
2051
2052         ASSERT_RTNL();
2053
2054         /*
2055          * Configure the tunnel with one of our IPv4
2056          * addresses... we should configure all of
2057          * our v4 addrs in the tunnel
2058          */
2059
2060         if ((idev = ipv6_find_idev(dev)) == NULL) {
2061                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2062                 return;
2063         }
2064
2065         sit_add_v4_addrs(idev);
2066
2067         if (dev->flags&IFF_POINTOPOINT) {
2068                 addrconf_add_mroute(dev);
2069                 addrconf_add_lroute(dev);
2070         } else
2071                 sit_route_add(dev);
2072 }
2073
2074 static inline int
2075 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2076 {
2077         struct in6_addr lladdr;
2078
2079         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2080                 addrconf_add_linklocal(idev, &lladdr);
2081                 return 0;
2082         }
2083         return -1;
2084 }
2085
2086 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2087 {
2088         struct net_device *link_dev;
2089
2090         /* first try to inherit the link-local address from the link device */
2091         if (idev->dev->iflink &&
2092             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2093                 if (!ipv6_inherit_linklocal(idev, link_dev))
2094                         return;
2095         }
2096         /* then try to inherit it from any device */
2097         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2098                 if (!ipv6_inherit_linklocal(idev, link_dev))
2099                         return;
2100         }
2101         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2102 }
2103
2104 /*
2105  * Autoconfigure tunnel with a link-local address so routing protocols,
2106  * DHCPv6, MLD etc. can be run over the virtual link
2107  */
2108
2109 static void addrconf_ip6_tnl_config(struct net_device *dev)
2110 {
2111         struct inet6_dev *idev;
2112
2113         ASSERT_RTNL();
2114
2115         if ((idev = addrconf_add_dev(dev)) == NULL) {
2116                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2117                 return;
2118         }
2119         ip6_tnl_add_linklocal(idev);
2120         addrconf_add_mroute(dev);
2121 }
2122
2123 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2124                            void * data)
2125 {
2126         struct net_device *dev = (struct net_device *) data;
2127         struct inet6_dev *idev = __in6_dev_get(dev);
2128
2129         switch(event) {
2130         case NETDEV_UP:
2131                 switch(dev->type) {
2132                 case ARPHRD_SIT:
2133                         addrconf_sit_config(dev);
2134                         break;
2135                 case ARPHRD_TUNNEL6:
2136                         addrconf_ip6_tnl_config(dev);
2137                         break;
2138                 case ARPHRD_LOOPBACK:
2139                         init_loopback(dev);
2140                         break;
2141
2142                 default:
2143                         addrconf_dev_config(dev);
2144                         break;
2145                 };
2146                 if (idev) {
2147                         /* If the MTU changed during the interface down, when the
2148                            interface up, the changed MTU must be reflected in the
2149                            idev as well as routers.
2150                          */
2151                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2152                                 rt6_mtu_change(dev, dev->mtu);
2153                                 idev->cnf.mtu6 = dev->mtu;
2154                         }
2155                         idev->tstamp = jiffies;
2156                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2157                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2158                            stop IPv6 on this interface.
2159                          */
2160                         if (dev->mtu < IPV6_MIN_MTU)
2161                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2162                 }
2163                 break;
2164
2165         case NETDEV_CHANGEMTU:
2166                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2167                         rt6_mtu_change(dev, dev->mtu);
2168                         idev->cnf.mtu6 = dev->mtu;
2169                         break;
2170                 }
2171
2172                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2173
2174         case NETDEV_DOWN:
2175         case NETDEV_UNREGISTER:
2176                 /*
2177                  *      Remove all addresses from this interface.
2178                  */
2179                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2180                 break;
2181         case NETDEV_CHANGE:
2182                 break;
2183         case NETDEV_CHANGENAME:
2184 #ifdef CONFIG_SYSCTL
2185                 if (idev) {
2186                         addrconf_sysctl_unregister(&idev->cnf);
2187                         neigh_sysctl_unregister(idev->nd_parms);
2188                         neigh_sysctl_register(dev, idev->nd_parms,
2189                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2190                                               &ndisc_ifinfo_sysctl_change,
2191                                               NULL);
2192                         addrconf_sysctl_register(idev, &idev->cnf);
2193                 }
2194 #endif
2195                 break;
2196         };
2197
2198         return NOTIFY_OK;
2199 }
2200
2201 /*
2202  *      addrconf module should be notified of a device going up
2203  */
2204 static struct notifier_block ipv6_dev_notf = {
2205         .notifier_call = addrconf_notify,
2206         .priority = 0
2207 };
2208
2209 static int addrconf_ifdown(struct net_device *dev, int how)
2210 {
2211         struct inet6_dev *idev;
2212         struct inet6_ifaddr *ifa, **bifa;
2213         int i;
2214
2215         ASSERT_RTNL();
2216
2217         if (dev == &loopback_dev && how == 1)
2218                 how = 0;
2219
2220         rt6_ifdown(dev);
2221         neigh_ifdown(&nd_tbl, dev);
2222
2223         idev = __in6_dev_get(dev);
2224         if (idev == NULL)
2225                 return -ENODEV;
2226
2227         /* Step 1: remove reference to ipv6 device from parent device.
2228                    Do not dev_put!
2229          */
2230         if (how == 1) {
2231                 write_lock_bh(&addrconf_lock);
2232                 dev->ip6_ptr = NULL;
2233                 idev->dead = 1;
2234                 write_unlock_bh(&addrconf_lock);
2235
2236                 /* Step 1.5: remove snmp6 entry */
2237                 snmp6_unregister_dev(idev);
2238
2239         }
2240
2241         /* Step 2: clear hash table */
2242         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2243                 bifa = &inet6_addr_lst[i];
2244
2245                 write_lock_bh(&addrconf_hash_lock);
2246                 while ((ifa = *bifa) != NULL) {
2247                         if (ifa->idev == idev) {
2248                                 *bifa = ifa->lst_next;
2249                                 ifa->lst_next = NULL;
2250                                 addrconf_del_timer(ifa);
2251                                 in6_ifa_put(ifa);
2252                                 continue;
2253                         }
2254                         bifa = &ifa->lst_next;
2255                 }
2256                 write_unlock_bh(&addrconf_hash_lock);
2257         }
2258
2259         write_lock_bh(&idev->lock);
2260
2261         /* Step 3: clear flags for stateless addrconf */
2262         if (how != 1)
2263                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2264
2265         /* Step 4: clear address list */
2266 #ifdef CONFIG_IPV6_PRIVACY
2267         if (how == 1 && del_timer(&idev->regen_timer))
2268                 in6_dev_put(idev);
2269
2270         /* clear tempaddr list */
2271         while ((ifa = idev->tempaddr_list) != NULL) {
2272                 idev->tempaddr_list = ifa->tmp_next;
2273                 ifa->tmp_next = NULL;
2274                 ifa->dead = 1;
2275                 write_unlock_bh(&idev->lock);
2276                 spin_lock_bh(&ifa->lock);
2277
2278                 if (ifa->ifpub) {
2279                         in6_ifa_put(ifa->ifpub);
2280                         ifa->ifpub = NULL;
2281                 }
2282                 spin_unlock_bh(&ifa->lock);
2283                 in6_ifa_put(ifa);
2284                 write_lock_bh(&idev->lock);
2285         }
2286 #endif
2287         while ((ifa = idev->addr_list) != NULL) {
2288                 idev->addr_list = ifa->if_next;
2289                 ifa->if_next = NULL;
2290                 ifa->dead = 1;
2291                 addrconf_del_timer(ifa);
2292                 write_unlock_bh(&idev->lock);
2293
2294                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2295                 in6_ifa_put(ifa);
2296
2297                 write_lock_bh(&idev->lock);
2298         }
2299         write_unlock_bh(&idev->lock);
2300
2301         /* Step 5: Discard multicast list */
2302
2303         if (how == 1)
2304                 ipv6_mc_destroy_dev(idev);
2305         else
2306                 ipv6_mc_down(idev);
2307
2308         /* Step 5: netlink notification of this interface */
2309         idev->tstamp = jiffies;
2310         inet6_ifinfo_notify(RTM_DELLINK, idev);
2311
2312         /* Shot the device (if unregistered) */
2313
2314         if (how == 1) {
2315 #ifdef CONFIG_SYSCTL
2316                 addrconf_sysctl_unregister(&idev->cnf);
2317                 neigh_sysctl_unregister(idev->nd_parms);
2318 #endif
2319                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2320                 neigh_ifdown(&nd_tbl, dev);
2321                 in6_dev_put(idev);
2322         }
2323         return 0;
2324 }
2325
2326 static void addrconf_rs_timer(unsigned long data)
2327 {
2328         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2329
2330         if (ifp->idev->cnf.forwarding)
2331                 goto out;
2332
2333         if (ifp->idev->if_flags & IF_RA_RCVD) {
2334                 /*
2335                  *      Announcement received after solicitation
2336                  *      was sent
2337                  */
2338                 goto out;
2339         }
2340
2341         spin_lock(&ifp->lock);
2342         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2343                 struct in6_addr all_routers;
2344
2345                 /* The wait after the last probe can be shorter */
2346                 addrconf_mod_timer(ifp, AC_RS,
2347                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2348                                    ifp->idev->cnf.rtr_solicit_delay :
2349                                    ifp->idev->cnf.rtr_solicit_interval);
2350                 spin_unlock(&ifp->lock);
2351
2352                 ipv6_addr_all_routers(&all_routers);
2353
2354                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2355         } else {
2356                 spin_unlock(&ifp->lock);
2357                 /*
2358                  * Note: we do not support deprecated "all on-link"
2359                  * assumption any longer.
2360                  */
2361                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2362                        ifp->idev->dev->name);
2363         }
2364
2365 out:
2366         in6_ifa_put(ifp);
2367 }
2368
2369 /*
2370  *      Duplicate Address Detection
2371  */
2372 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2373 {
2374         struct inet6_dev *idev = ifp->idev;
2375         struct net_device *dev = idev->dev;
2376         unsigned long rand_num;
2377
2378         addrconf_join_solict(dev, &ifp->addr);
2379
2380         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2381                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2382                                         flags);
2383
2384         net_srandom(ifp->addr.s6_addr32[3]);
2385         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2386
2387         read_lock_bh(&idev->lock);
2388         if (ifp->dead)
2389                 goto out;
2390         spin_lock_bh(&ifp->lock);
2391
2392         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2393             !(ifp->flags&IFA_F_TENTATIVE)) {
2394                 ifp->flags &= ~IFA_F_TENTATIVE;
2395                 spin_unlock_bh(&ifp->lock);
2396                 read_unlock_bh(&idev->lock);
2397
2398                 addrconf_dad_completed(ifp);
2399                 return;
2400         }
2401
2402         ifp->probes = idev->cnf.dad_transmits;
2403         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2404
2405         spin_unlock_bh(&ifp->lock);
2406 out:
2407         read_unlock_bh(&idev->lock);
2408 }
2409
2410 static void addrconf_dad_timer(unsigned long data)
2411 {
2412         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2413         struct inet6_dev *idev = ifp->idev;
2414         struct in6_addr unspec;
2415         struct in6_addr mcaddr;
2416
2417         read_lock_bh(&idev->lock);
2418         if (idev->dead) {
2419                 read_unlock_bh(&idev->lock);
2420                 goto out;
2421         }
2422         spin_lock_bh(&ifp->lock);
2423         if (ifp->probes == 0) {
2424                 /*
2425                  * DAD was successful
2426                  */
2427
2428                 ifp->flags &= ~IFA_F_TENTATIVE;
2429                 spin_unlock_bh(&ifp->lock);
2430                 read_unlock_bh(&idev->lock);
2431
2432                 addrconf_dad_completed(ifp);
2433
2434                 goto out;
2435         }
2436
2437         ifp->probes--;
2438         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2439         spin_unlock_bh(&ifp->lock);
2440         read_unlock_bh(&idev->lock);
2441
2442         /* send a neighbour solicitation for our addr */
2443         memset(&unspec, 0, sizeof(unspec));
2444         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2445         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2446 out:
2447         in6_ifa_put(ifp);
2448 }
2449
2450 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2451 {
2452         struct net_device *     dev = ifp->idev->dev;
2453
2454         /*
2455          *      Configure the address for reception. Now it is valid.
2456          */
2457
2458         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2459
2460         /* If added prefix is link local and forwarding is off,
2461            start sending router solicitations.
2462          */
2463
2464         if (ifp->idev->cnf.forwarding == 0 &&
2465             ifp->idev->cnf.rtr_solicits > 0 &&
2466             (dev->flags&IFF_LOOPBACK) == 0 &&
2467             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2468                 struct in6_addr all_routers;
2469
2470                 ipv6_addr_all_routers(&all_routers);
2471
2472                 /*
2473                  *      If a host as already performed a random delay
2474                  *      [...] as part of DAD [...] there is no need
2475                  *      to delay again before sending the first RS
2476                  */
2477                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2478
2479                 spin_lock_bh(&ifp->lock);
2480                 ifp->probes = 1;
2481                 ifp->idev->if_flags |= IF_RS_SENT;
2482                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2483                 spin_unlock_bh(&ifp->lock);
2484         }
2485 }
2486
2487 #ifdef CONFIG_PROC_FS
2488 struct if6_iter_state {
2489         int bucket;
2490 };
2491
2492 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2493 {
2494         struct inet6_ifaddr *ifa = NULL;
2495         struct if6_iter_state *state = seq->private;
2496
2497         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2498                 ifa = inet6_addr_lst[state->bucket];
2499                 if (ifa)
2500                         break;
2501         }
2502         return ifa;
2503 }
2504
2505 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2506 {
2507         struct if6_iter_state *state = seq->private;
2508
2509         ifa = ifa->lst_next;
2510 try_again:
2511         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2512                 ifa = inet6_addr_lst[state->bucket];
2513                 goto try_again;
2514         }
2515         return ifa;
2516 }
2517
2518 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2519 {
2520         struct inet6_ifaddr *ifa = if6_get_first(seq);
2521
2522         if (ifa)
2523                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2524                         --pos;
2525         return pos ? NULL : ifa;
2526 }
2527
2528 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2529 {
2530         read_lock_bh(&addrconf_hash_lock);
2531         return if6_get_idx(seq, *pos);
2532 }
2533
2534 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2535 {
2536         struct inet6_ifaddr *ifa;
2537
2538         ifa = if6_get_next(seq, v);
2539         ++*pos;
2540         return ifa;
2541 }
2542
2543 static void if6_seq_stop(struct seq_file *seq, void *v)
2544 {
2545         read_unlock_bh(&addrconf_hash_lock);
2546 }
2547
2548 static int if6_seq_show(struct seq_file *seq, void *v)
2549 {
2550         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2551         seq_printf(seq,
2552                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2553                    NIP6(ifp->addr),
2554                    ifp->idev->dev->ifindex,
2555                    ifp->prefix_len,
2556                    ifp->scope,
2557                    ifp->flags,
2558                    ifp->idev->dev->name);
2559         return 0;
2560 }
2561
2562 static struct seq_operations if6_seq_ops = {
2563         .start  = if6_seq_start,
2564         .next   = if6_seq_next,
2565         .show   = if6_seq_show,
2566         .stop   = if6_seq_stop,
2567 };
2568
2569 static int if6_seq_open(struct inode *inode, struct file *file)
2570 {
2571         struct seq_file *seq;
2572         int rc = -ENOMEM;
2573         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2574
2575         if (!s)
2576                 goto out;
2577         memset(s, 0, sizeof(*s));
2578
2579         rc = seq_open(file, &if6_seq_ops);
2580         if (rc)
2581                 goto out_kfree;
2582
2583         seq = file->private_data;
2584         seq->private = s;
2585 out:
2586         return rc;
2587 out_kfree:
2588         kfree(s);
2589         goto out;
2590 }
2591
2592 static struct file_operations if6_fops = {
2593         .owner          = THIS_MODULE,
2594         .open           = if6_seq_open,
2595         .read           = seq_read,
2596         .llseek         = seq_lseek,
2597         .release        = seq_release_private,
2598 };
2599
2600 int __init if6_proc_init(void)
2601 {
2602         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2603                 return -ENOMEM;
2604         return 0;
2605 }
2606
2607 void if6_proc_exit(void)
2608 {
2609         proc_net_remove("if_inet6");
2610 }
2611 #endif  /* CONFIG_PROC_FS */
2612
2613 /*
2614  *      Periodic address status verification
2615  */
2616
2617 static void addrconf_verify(unsigned long foo)
2618 {
2619         struct inet6_ifaddr *ifp;
2620         unsigned long now, next;
2621         int i;
2622
2623         spin_lock_bh(&addrconf_verify_lock);
2624         now = jiffies;
2625         next = now + ADDR_CHECK_FREQUENCY;
2626
2627         del_timer(&addr_chk_timer);
2628
2629         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2630
2631 restart:
2632                 read_lock(&addrconf_hash_lock);
2633                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2634                         unsigned long age;
2635 #ifdef CONFIG_IPV6_PRIVACY
2636                         unsigned long regen_advance;
2637 #endif
2638
2639                         if (ifp->flags & IFA_F_PERMANENT)
2640                                 continue;
2641
2642                         spin_lock(&ifp->lock);
2643                         age = (now - ifp->tstamp) / HZ;
2644
2645 #ifdef CONFIG_IPV6_PRIVACY
2646                         regen_advance = ifp->idev->cnf.regen_max_retry *
2647                                         ifp->idev->cnf.dad_transmits *
2648                                         ifp->idev->nd_parms->retrans_time / HZ;
2649 #endif
2650
2651                         if (age >= ifp->valid_lft) {
2652                                 spin_unlock(&ifp->lock);
2653                                 in6_ifa_hold(ifp);
2654                                 read_unlock(&addrconf_hash_lock);
2655                                 ipv6_del_addr(ifp);
2656                                 goto restart;
2657                         } else if (age >= ifp->prefered_lft) {
2658                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2659                                 int deprecate = 0;
2660
2661                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2662                                         deprecate = 1;
2663                                         ifp->flags |= IFA_F_DEPRECATED;
2664                                 }
2665
2666                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2667                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2668
2669                                 spin_unlock(&ifp->lock);
2670
2671                                 if (deprecate) {
2672                                         in6_ifa_hold(ifp);
2673                                         read_unlock(&addrconf_hash_lock);
2674
2675                                         ipv6_ifa_notify(0, ifp);
2676                                         in6_ifa_put(ifp);
2677                                         goto restart;
2678                                 }
2679 #ifdef CONFIG_IPV6_PRIVACY
2680                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2681                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2682                                 if (age >= ifp->prefered_lft - regen_advance) {
2683                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2684                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2685                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2686                                         if (!ifp->regen_count && ifpub) {
2687                                                 ifp->regen_count++;
2688                                                 in6_ifa_hold(ifp);
2689                                                 in6_ifa_hold(ifpub);
2690                                                 spin_unlock(&ifp->lock);
2691                                                 read_unlock(&addrconf_hash_lock);
2692                                                 ipv6_create_tempaddr(ifpub, ifp);
2693                                                 in6_ifa_put(ifpub);
2694                                                 in6_ifa_put(ifp);
2695                                                 goto restart;
2696                                         }
2697                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2698                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2699                                 spin_unlock(&ifp->lock);
2700 #endif
2701                         } else {
2702                                 /* ifp->prefered_lft <= ifp->valid_lft */
2703                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2704                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2705                                 spin_unlock(&ifp->lock);
2706                         }
2707                 }
2708                 read_unlock(&addrconf_hash_lock);
2709         }
2710
2711         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2712         add_timer(&addr_chk_timer);
2713         spin_unlock_bh(&addrconf_verify_lock);
2714 }
2715
2716 static int
2717 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2718 {
2719         struct rtattr **rta = arg;
2720         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2721         struct in6_addr *pfx;
2722
2723         pfx = NULL;
2724         if (rta[IFA_ADDRESS-1]) {
2725                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2726                         return -EINVAL;
2727                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2728         }
2729         if (rta[IFA_LOCAL-1]) {
2730                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2731                         return -EINVAL;
2732                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2733         }
2734         if (pfx == NULL)
2735                 return -EINVAL;
2736
2737         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2738 }
2739
2740 static int
2741 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2742 {
2743         struct rtattr  **rta = arg;
2744         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2745         struct in6_addr *pfx;
2746
2747         pfx = NULL;
2748         if (rta[IFA_ADDRESS-1]) {
2749                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2750                         return -EINVAL;
2751                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2752         }
2753         if (rta[IFA_LOCAL-1]) {
2754                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2755                         return -EINVAL;
2756                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2757         }
2758         if (pfx == NULL)
2759                 return -EINVAL;
2760
2761         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2762 }
2763
2764 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2765                              u32 pid, u32 seq, int event, unsigned int flags)
2766 {
2767         struct ifaddrmsg *ifm;
2768         struct nlmsghdr  *nlh;
2769         struct ifa_cacheinfo ci;
2770         unsigned char    *b = skb->tail;
2771
2772         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2773         ifm = NLMSG_DATA(nlh);
2774         ifm->ifa_family = AF_INET6;
2775         ifm->ifa_prefixlen = ifa->prefix_len;
2776         ifm->ifa_flags = ifa->flags;
2777         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2778         if (ifa->scope&IFA_HOST)
2779                 ifm->ifa_scope = RT_SCOPE_HOST;
2780         else if (ifa->scope&IFA_LINK)
2781                 ifm->ifa_scope = RT_SCOPE_LINK;
2782         else if (ifa->scope&IFA_SITE)
2783                 ifm->ifa_scope = RT_SCOPE_SITE;
2784         ifm->ifa_index = ifa->idev->dev->ifindex;
2785         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2786         if (!(ifa->flags&IFA_F_PERMANENT)) {
2787                 ci.ifa_prefered = ifa->prefered_lft;
2788                 ci.ifa_valid = ifa->valid_lft;
2789                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2790                         long tval = (jiffies - ifa->tstamp)/HZ;
2791                         ci.ifa_prefered -= tval;
2792                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2793                                 ci.ifa_valid -= tval;
2794                 }
2795         } else {
2796                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2797                 ci.ifa_valid = INFINITY_LIFE_TIME;
2798         }
2799         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2800                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2801         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2802                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2803         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2804         nlh->nlmsg_len = skb->tail - b;
2805         return skb->len;
2806
2807 nlmsg_failure:
2808 rtattr_failure:
2809         skb_trim(skb, b - skb->data);
2810         return -1;
2811 }
2812
2813 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2814                                 u32 pid, u32 seq, int event, u16 flags)
2815 {
2816         struct ifaddrmsg *ifm;
2817         struct nlmsghdr  *nlh;
2818         struct ifa_cacheinfo ci;
2819         unsigned char    *b = skb->tail;
2820
2821         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2822         ifm = NLMSG_DATA(nlh);
2823         ifm->ifa_family = AF_INET6;
2824         ifm->ifa_prefixlen = 128;
2825         ifm->ifa_flags = IFA_F_PERMANENT;
2826         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2827         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2828                 ifm->ifa_scope = RT_SCOPE_SITE;
2829         ifm->ifa_index = ifmca->idev->dev->ifindex;
2830         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2831         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2832                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2833                     * 100 / HZ);
2834         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2835                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2836                     * 100 / HZ);
2837         ci.ifa_prefered = INFINITY_LIFE_TIME;
2838         ci.ifa_valid = INFINITY_LIFE_TIME;
2839         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2840         nlh->nlmsg_len = skb->tail - b;
2841         return skb->len;
2842
2843 nlmsg_failure:
2844 rtattr_failure:
2845         skb_trim(skb, b - skb->data);
2846         return -1;
2847 }
2848
2849 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2850                                 u32 pid, u32 seq, int event, unsigned int flags)
2851 {
2852         struct ifaddrmsg *ifm;
2853         struct nlmsghdr  *nlh;
2854         struct ifa_cacheinfo ci;
2855         unsigned char    *b = skb->tail;
2856
2857         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2858         ifm = NLMSG_DATA(nlh);
2859         ifm->ifa_family = AF_INET6;
2860         ifm->ifa_prefixlen = 128;
2861         ifm->ifa_flags = IFA_F_PERMANENT;
2862         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2863         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2864                 ifm->ifa_scope = RT_SCOPE_SITE;
2865         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2866         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2867         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2868                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2869                     * 100 / HZ);
2870         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2871                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2872                     * 100 / HZ);
2873         ci.ifa_prefered = INFINITY_LIFE_TIME;
2874         ci.ifa_valid = INFINITY_LIFE_TIME;
2875         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2876         nlh->nlmsg_len = skb->tail - b;
2877         return skb->len;
2878
2879 nlmsg_failure:
2880 rtattr_failure:
2881         skb_trim(skb, b - skb->data);
2882         return -1;
2883 }
2884
2885 enum addr_type_t
2886 {
2887         UNICAST_ADDR,
2888         MULTICAST_ADDR,
2889         ANYCAST_ADDR,
2890 };
2891
2892 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2893                            enum addr_type_t type)
2894 {
2895         int idx, ip_idx;
2896         int s_idx, s_ip_idx;
2897         int err = 1;
2898         struct net_device *dev;
2899         struct inet6_dev *idev = NULL;
2900         struct inet6_ifaddr *ifa;
2901         struct ifmcaddr6 *ifmca;
2902         struct ifacaddr6 *ifaca;
2903
2904         s_idx = cb->args[0];
2905         s_ip_idx = ip_idx = cb->args[1];
2906         read_lock(&dev_base_lock);
2907
2908         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2909                 if (idx < s_idx)
2910                         continue;
2911                 if (idx > s_idx)
2912                         s_ip_idx = 0;
2913                 ip_idx = 0;
2914                 if ((idev = in6_dev_get(dev)) == NULL)
2915                         continue;
2916                 read_lock_bh(&idev->lock);
2917                 switch (type) {
2918                 case UNICAST_ADDR:
2919                         /* unicast address incl. temp addr */
2920                         for (ifa = idev->addr_list; ifa;
2921                              ifa = ifa->if_next, ip_idx++) {
2922                                 if (ip_idx < s_ip_idx)
2923                                         continue;
2924                                 if ((err = inet6_fill_ifaddr(skb, ifa,
2925                                     NETLINK_CB(cb->skb).pid,
2926                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
2927                                     NLM_F_MULTI)) <= 0)
2928                                         goto done;
2929                         }
2930                         break;
2931                 case MULTICAST_ADDR:
2932                         /* multicast address */
2933                         for (ifmca = idev->mc_list; ifmca;
2934                              ifmca = ifmca->next, ip_idx++) {
2935                                 if (ip_idx < s_ip_idx)
2936                                         continue;
2937                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2938                                     NETLINK_CB(cb->skb).pid,
2939                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2940                                     NLM_F_MULTI)) <= 0)
2941                                         goto done;
2942                         }
2943                         break;
2944                 case ANYCAST_ADDR:
2945                         /* anycast address */
2946                         for (ifaca = idev->ac_list; ifaca;
2947                              ifaca = ifaca->aca_next, ip_idx++) {
2948                                 if (ip_idx < s_ip_idx)
2949                                         continue;
2950                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2951                                     NETLINK_CB(cb->skb).pid,
2952                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2953                                     NLM_F_MULTI)) <= 0)
2954                                         goto done;
2955                         }
2956                         break;
2957                 default:
2958                         break;
2959                 }
2960                 read_unlock_bh(&idev->lock);
2961                 in6_dev_put(idev);
2962         }
2963 done:
2964         if (err <= 0) {
2965                 read_unlock_bh(&idev->lock);
2966                 in6_dev_put(idev);
2967         }
2968         read_unlock(&dev_base_lock);
2969         cb->args[0] = idx;
2970         cb->args[1] = ip_idx;
2971         return skb->len;
2972 }
2973
2974 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2975 {
2976         enum addr_type_t type = UNICAST_ADDR;
2977         return inet6_dump_addr(skb, cb, type);
2978 }
2979
2980 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2981 {
2982         enum addr_type_t type = MULTICAST_ADDR;
2983         return inet6_dump_addr(skb, cb, type);
2984 }
2985
2986
2987 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2988 {
2989         enum addr_type_t type = ANYCAST_ADDR;
2990         return inet6_dump_addr(skb, cb, type);
2991 }
2992
2993 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2994 {
2995         struct sk_buff *skb;
2996         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2997
2998         skb = alloc_skb(size, GFP_ATOMIC);
2999         if (!skb) {
3000                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3001                 return;
3002         }
3003         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3004                 kfree_skb(skb);
3005                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3006                 return;
3007         }
3008         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3009         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3010 }
3011
3012 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3013                                 __s32 *array, int bytes)
3014 {
3015         memset(array, 0, bytes);
3016         array[DEVCONF_FORWARDING] = cnf->forwarding;
3017         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3018         array[DEVCONF_MTU6] = cnf->mtu6;
3019         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3020         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3021         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3022         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3023         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3024         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3025         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3026         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3027 #ifdef CONFIG_IPV6_PRIVACY
3028         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3029         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3030         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3031         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3032         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3033 #endif
3034         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3035 }
3036
3037 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3038                              u32 pid, u32 seq, int event, unsigned int flags)
3039 {
3040         struct net_device       *dev = idev->dev;
3041         __s32                   *array = NULL;
3042         struct ifinfomsg        *r;
3043         struct nlmsghdr         *nlh;
3044         unsigned char           *b = skb->tail;
3045         struct rtattr           *subattr;
3046         __u32                   mtu = dev->mtu;
3047         struct ifla_cacheinfo   ci;
3048
3049         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3050         r = NLMSG_DATA(nlh);
3051         r->ifi_family = AF_INET6;
3052         r->__ifi_pad = 0;
3053         r->ifi_type = dev->type;
3054         r->ifi_index = dev->ifindex;
3055         r->ifi_flags = dev_get_flags(dev);
3056         r->ifi_change = 0;
3057
3058         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3059
3060         if (dev->addr_len)
3061                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3062
3063         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3064         if (dev->ifindex != dev->iflink)
3065                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3066
3067         subattr = (struct rtattr*)skb->tail;
3068
3069         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3070
3071         /* return the device flags */
3072         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3073
3074         /* return interface cacheinfo */
3075         ci.max_reasm_len = IPV6_MAXPLEN;
3076         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3077                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3078         ci.reachable_time = idev->nd_parms->reachable_time;
3079         ci.retrans_time = idev->nd_parms->retrans_time;
3080         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3081
3082         /* return the device sysctl params */
3083         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3084                 goto rtattr_failure;
3085         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3086         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3087
3088         /* XXX - Statistics/MC not implemented */
3089         subattr->rta_len = skb->tail - (u8*)subattr;
3090
3091         nlh->nlmsg_len = skb->tail - b;
3092         kfree(array);
3093         return skb->len;
3094
3095 nlmsg_failure:
3096 rtattr_failure:
3097         kfree(array);
3098         skb_trim(skb, b - skb->data);
3099         return -1;
3100 }
3101
3102 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3103 {
3104         int idx, err;
3105         int s_idx = cb->args[0];
3106         struct net_device *dev;
3107         struct inet6_dev *idev;
3108
3109         read_lock(&dev_base_lock);
3110         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3111                 if (idx < s_idx)
3112                         continue;
3113                 if ((idev = in6_dev_get(dev)) == NULL)
3114                         continue;
3115                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3116                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3117                 in6_dev_put(idev);
3118                 if (err <= 0)
3119                         break;
3120         }
3121         read_unlock(&dev_base_lock);
3122         cb->args[0] = idx;
3123
3124         return skb->len;
3125 }
3126
3127 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3128 {
3129         struct sk_buff *skb;
3130         /* 128 bytes ?? */
3131         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3132
3133         skb = alloc_skb(size, GFP_ATOMIC);
3134         if (!skb) {
3135                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3136                 return;
3137         }
3138         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3139                 kfree_skb(skb);
3140                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3141                 return;
3142         }
3143         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3144         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3145 }
3146
3147 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3148                         struct prefix_info *pinfo, u32 pid, u32 seq,
3149                         int event, unsigned int flags)
3150 {
3151         struct prefixmsg        *pmsg;
3152         struct nlmsghdr         *nlh;
3153         unsigned char           *b = skb->tail;
3154         struct prefix_cacheinfo ci;
3155
3156         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3157         pmsg = NLMSG_DATA(nlh);
3158         pmsg->prefix_family = AF_INET6;
3159         pmsg->prefix_pad1 = 0;
3160         pmsg->prefix_pad2 = 0;
3161         pmsg->prefix_ifindex = idev->dev->ifindex;
3162         pmsg->prefix_len = pinfo->prefix_len;
3163         pmsg->prefix_type = pinfo->type;
3164         pmsg->prefix_pad3 = 0;
3165
3166         pmsg->prefix_flags = 0;
3167         if (pinfo->onlink)
3168                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3169         if (pinfo->autoconf)
3170                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3171
3172         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3173
3174         ci.preferred_time = ntohl(pinfo->prefered);
3175         ci.valid_time = ntohl(pinfo->valid);
3176         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3177
3178         nlh->nlmsg_len = skb->tail - b;
3179         return skb->len;
3180
3181 nlmsg_failure:
3182 rtattr_failure:
3183         skb_trim(skb, b - skb->data);
3184         return -1;
3185 }
3186
3187 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3188                          struct prefix_info *pinfo)
3189 {
3190         struct sk_buff *skb;
3191         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3192
3193         skb = alloc_skb(size, GFP_ATOMIC);
3194         if (!skb) {
3195                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3196                 return;
3197         }
3198         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3199                 kfree_skb(skb);
3200                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3201                 return;
3202         }
3203         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3204         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3205 }
3206
3207 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3208         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3209         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3210         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3211         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3212         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3213         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3214         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3215         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3216         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3217                                       .dumpit   = inet6_dump_fib, },
3218 };
3219
3220 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3221 {
3222         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3223
3224         switch (event) {
3225         case RTM_NEWADDR:
3226                 dst_hold(&ifp->rt->u.dst);
3227                 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3228                         dst_release(&ifp->rt->u.dst);
3229                 if (ifp->idev->cnf.forwarding)
3230                         addrconf_join_anycast(ifp);
3231                 break;
3232         case RTM_DELADDR:
3233                 if (ifp->idev->cnf.forwarding)
3234                         addrconf_leave_anycast(ifp);
3235                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3236                 dst_hold(&ifp->rt->u.dst);
3237                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3238                         dst_free(&ifp->rt->u.dst);
3239                 else
3240                         dst_release(&ifp->rt->u.dst);
3241                 break;
3242         }
3243 }
3244
3245 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3246 {
3247         read_lock_bh(&addrconf_lock);
3248         if (likely(ifp->idev->dead == 0))
3249                 __ipv6_ifa_notify(event, ifp);
3250         read_unlock_bh(&addrconf_lock);
3251 }
3252
3253 #ifdef CONFIG_SYSCTL
3254
3255 static
3256 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3257                            void __user *buffer, size_t *lenp, loff_t *ppos)
3258 {
3259         int *valp = ctl->data;
3260         int val = *valp;
3261         int ret;
3262
3263         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3264
3265         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3266                 if (valp != &ipv6_devconf.forwarding) {
3267                         if ((!*valp) ^ (!val)) {
3268                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3269                                 if (idev == NULL)
3270                                         return ret;
3271                                 dev_forward_change(idev);
3272                         }
3273                 } else {
3274                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3275                         addrconf_forward_change();
3276                 }
3277                 if (*valp)
3278                         rt6_purge_dflt_routers();
3279         }
3280
3281         return ret;
3282 }
3283
3284 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3285                                             int __user *name, int nlen,
3286                                             void __user *oldval,
3287                                             size_t __user *oldlenp,
3288                                             void __user *newval, size_t newlen,
3289                                             void **context)
3290 {
3291         int *valp = table->data;
3292         int new;
3293
3294         if (!newval || !newlen)
3295                 return 0;
3296         if (newlen != sizeof(int))
3297                 return -EINVAL;
3298         if (get_user(new, (int __user *)newval))
3299                 return -EFAULT;
3300         if (new == *valp)
3301                 return 0;
3302         if (oldval && oldlenp) {
3303                 size_t len;
3304                 if (get_user(len, oldlenp))
3305                         return -EFAULT;
3306                 if (len) {
3307                         if (len > table->maxlen)
3308                                 len = table->maxlen;
3309                         if (copy_to_user(oldval, valp, len))
3310                                 return -EFAULT;
3311                         if (put_user(len, oldlenp))
3312                                 return -EFAULT;
3313                 }
3314         }
3315
3316         if (valp != &ipv6_devconf_dflt.forwarding) {
3317                 if (valp != &ipv6_devconf.forwarding) {
3318                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3319                         int changed;
3320                         if (unlikely(idev == NULL))
3321                                 return -ENODEV;
3322                         changed = (!*valp) ^ (!new);
3323                         *valp = new;
3324                         if (changed)
3325                                 dev_forward_change(idev);
3326                 } else {
3327                         *valp = new;
3328                         addrconf_forward_change();
3329                 }
3330
3331                 if (*valp)
3332                         rt6_purge_dflt_routers();
3333         } else
3334                 *valp = new;
3335
3336         return 1;
3337 }
3338
3339 static struct addrconf_sysctl_table
3340 {
3341         struct ctl_table_header *sysctl_header;
3342         ctl_table addrconf_vars[__NET_IPV6_MAX];
3343         ctl_table addrconf_dev[2];
3344         ctl_table addrconf_conf_dir[2];
3345         ctl_table addrconf_proto_dir[2];
3346         ctl_table addrconf_root_dir[2];
3347 } addrconf_sysctl = {
3348         .sysctl_header = NULL,
3349         .addrconf_vars = {
3350                 {
3351                         .ctl_name       =       NET_IPV6_FORWARDING,
3352                         .procname       =       "forwarding",
3353                         .data           =       &ipv6_devconf.forwarding,
3354                         .maxlen         =       sizeof(int),
3355                         .mode           =       0644,
3356                         .proc_handler   =       &addrconf_sysctl_forward,
3357                         .strategy       =       &addrconf_sysctl_forward_strategy,
3358                 },
3359                 {
3360                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3361                         .procname       =       "hop_limit",
3362                         .data           =       &ipv6_devconf.hop_limit,
3363                         .maxlen         =       sizeof(int),
3364                         .mode           =       0644,
3365                         .proc_handler   =       proc_dointvec,
3366                 },
3367                 {
3368                         .ctl_name       =       NET_IPV6_MTU,
3369                         .procname       =       "mtu",
3370                         .data           =       &ipv6_devconf.mtu6,
3371                         .maxlen         =       sizeof(int),
3372                         .mode           =       0644,
3373                         .proc_handler   =       &proc_dointvec,
3374                 },
3375                 {
3376                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3377                         .procname       =       "accept_ra",
3378                         .data           =       &ipv6_devconf.accept_ra,
3379                         .maxlen         =       sizeof(int),
3380                         .mode           =       0644,
3381                         .proc_handler   =       &proc_dointvec,
3382                 },
3383                 {
3384                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3385                         .procname       =       "accept_redirects",
3386                         .data           =       &ipv6_devconf.accept_redirects,
3387                         .maxlen         =       sizeof(int),
3388                         .mode           =       0644,
3389                         .proc_handler   =       &proc_dointvec,
3390                 },
3391                 {
3392                         .ctl_name       =       NET_IPV6_AUTOCONF,
3393                         .procname       =       "autoconf",
3394                         .data           =       &ipv6_devconf.autoconf,
3395                         .maxlen         =       sizeof(int),
3396                         .mode           =       0644,
3397                         .proc_handler   =       &proc_dointvec,
3398                 },
3399                 {
3400                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3401                         .procname       =       "dad_transmits",
3402                         .data           =       &ipv6_devconf.dad_transmits,
3403                         .maxlen         =       sizeof(int),
3404                         .mode           =       0644,
3405                         .proc_handler   =       &proc_dointvec,
3406                 },
3407                 {
3408                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3409                         .procname       =       "router_solicitations",
3410                         .data           =       &ipv6_devconf.rtr_solicits,
3411                         .maxlen         =       sizeof(int),
3412                         .mode           =       0644,
3413                         .proc_handler   =       &proc_dointvec,
3414                 },
3415                 {
3416                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3417                         .procname       =       "router_solicitation_interval",
3418                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3419                         .maxlen         =       sizeof(int),
3420                         .mode           =       0644,
3421                         .proc_handler   =       &proc_dointvec_jiffies,
3422                         .strategy       =       &sysctl_jiffies,
3423                 },
3424                 {
3425                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3426                         .procname       =       "router_solicitation_delay",
3427                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3428                         .maxlen         =       sizeof(int),
3429                         .mode           =       0644,
3430                         .proc_handler   =       &proc_dointvec_jiffies,
3431                         .strategy       =       &sysctl_jiffies,
3432                 },
3433                 {
3434                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3435                         .procname       =       "force_mld_version",
3436                         .data           =       &ipv6_devconf.force_mld_version,
3437                         .maxlen         =       sizeof(int),
3438                         .mode           =       0644,
3439                         .proc_handler   =       &proc_dointvec,
3440                 },
3441 #ifdef CONFIG_IPV6_PRIVACY
3442                 {
3443                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3444                         .procname       =       "use_tempaddr",
3445                         .data           =       &ipv6_devconf.use_tempaddr,
3446                         .maxlen         =       sizeof(int),
3447                         .mode           =       0644,
3448                         .proc_handler   =       &proc_dointvec,
3449                 },
3450                 {
3451                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3452                         .procname       =       "temp_valid_lft",
3453                         .data           =       &ipv6_devconf.temp_valid_lft,
3454                         .maxlen         =       sizeof(int),
3455                         .mode           =       0644,
3456                         .proc_handler   =       &proc_dointvec,
3457                 },
3458                 {
3459                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3460                         .procname       =       "temp_prefered_lft",
3461                         .data           =       &ipv6_devconf.temp_prefered_lft,
3462                         .maxlen         =       sizeof(int),
3463                         .mode           =       0644,
3464                         .proc_handler   =       &proc_dointvec,
3465                 },
3466                 {
3467                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3468                         .procname       =       "regen_max_retry",
3469                         .data           =       &ipv6_devconf.regen_max_retry,
3470                         .maxlen         =       sizeof(int),
3471                         .mode           =       0644,
3472                         .proc_handler   =       &proc_dointvec,
3473                 },
3474                 {
3475                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3476                         .procname       =       "max_desync_factor",
3477                         .data           =       &ipv6_devconf.max_desync_factor,
3478                         .maxlen         =       sizeof(int),
3479                         .mode           =       0644,
3480                         .proc_handler   =       &proc_dointvec,
3481                 },
3482 #endif
3483                 {
3484                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3485                         .procname       =       "max_addresses",
3486                         .data           =       &ipv6_devconf.max_addresses,
3487                         .maxlen         =       sizeof(int),
3488                         .mode           =       0644,
3489                         .proc_handler   =       &proc_dointvec,
3490                 },
3491                 {
3492                         .ctl_name       =       0,      /* sentinel */
3493                 }
3494         },
3495         .addrconf_dev = {
3496                 {
3497                         .ctl_name       =       NET_PROTO_CONF_ALL,
3498                         .procname       =       "all",
3499                         .mode           =       0555,
3500                         .child          =       addrconf_sysctl.addrconf_vars,
3501                 },
3502                 {
3503                         .ctl_name       =       0,      /* sentinel */
3504                 }
3505         },
3506         .addrconf_conf_dir = {
3507                 {
3508                         .ctl_name       =       NET_IPV6_CONF,
3509                         .procname       =       "conf",
3510                         .mode           =       0555,
3511                         .child          =       addrconf_sysctl.addrconf_dev,
3512                 },
3513                 {
3514                         .ctl_name       =       0,      /* sentinel */
3515                 }
3516         },
3517         .addrconf_proto_dir = {
3518                 {
3519                         .ctl_name       =       NET_IPV6,
3520                         .procname       =       "ipv6",
3521                         .mode           =       0555,
3522                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3523                 },
3524                 {
3525                         .ctl_name       =       0,      /* sentinel */
3526                 }
3527         },
3528         .addrconf_root_dir = {
3529                 {
3530                         .ctl_name       =       CTL_NET,
3531                         .procname       =       "net",
3532                         .mode           =       0555,
3533                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3534                 },
3535                 {
3536                         .ctl_name       =       0,      /* sentinel */
3537                 }
3538         },
3539 };
3540
3541 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3542 {
3543         int i;
3544         struct net_device *dev = idev ? idev->dev : NULL;
3545         struct addrconf_sysctl_table *t;
3546         char *dev_name = NULL;
3547
3548         t = kmalloc(sizeof(*t), GFP_KERNEL);
3549         if (t == NULL)
3550                 return;
3551         memcpy(t, &addrconf_sysctl, sizeof(*t));
3552         for (i=0; t->addrconf_vars[i].data; i++) {
3553                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3554                 t->addrconf_vars[i].de = NULL;
3555                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3556         }
3557         if (dev) {
3558                 dev_name = dev->name;
3559                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3560         } else {
3561                 dev_name = "default";
3562                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3563         }
3564
3565         /*
3566          * Make a copy of dev_name, because '.procname' is regarded as const
3567          * by sysctl and we wouldn't want anyone to change it under our feet
3568          * (see SIOCSIFNAME).
3569          */
3570         dev_name = kstrdup(dev_name, GFP_KERNEL);
3571         if (!dev_name)
3572             goto free;
3573
3574         t->addrconf_dev[0].procname = dev_name;
3575
3576         t->addrconf_dev[0].child = t->addrconf_vars;
3577         t->addrconf_dev[0].de = NULL;
3578         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3579         t->addrconf_conf_dir[0].de = NULL;
3580         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3581         t->addrconf_proto_dir[0].de = NULL;
3582         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3583         t->addrconf_root_dir[0].de = NULL;
3584
3585         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3586         if (t->sysctl_header == NULL)
3587                 goto free_procname;
3588         else
3589                 p->sysctl = t;
3590         return;
3591
3592         /* error path */
3593  free_procname:
3594         kfree(dev_name);
3595  free:
3596         kfree(t);
3597
3598         return;
3599 }
3600
3601 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3602 {
3603         if (p->sysctl) {
3604                 struct addrconf_sysctl_table *t = p->sysctl;
3605                 p->sysctl = NULL;
3606                 unregister_sysctl_table(t->sysctl_header);
3607                 kfree(t->addrconf_dev[0].procname);
3608                 kfree(t);
3609         }
3610 }
3611
3612
3613 #endif
3614
3615 /*
3616  *      Device notifier
3617  */
3618
3619 int register_inet6addr_notifier(struct notifier_block *nb)
3620 {
3621         return notifier_chain_register(&inet6addr_chain, nb);
3622 }
3623
3624 int unregister_inet6addr_notifier(struct notifier_block *nb)
3625 {
3626         return notifier_chain_unregister(&inet6addr_chain,nb);
3627 }
3628
3629 /*
3630  *      Init / cleanup code
3631  */
3632
3633 int __init addrconf_init(void)
3634 {
3635         int err = 0;
3636
3637         /* The addrconf netdev notifier requires that loopback_dev
3638          * has it's ipv6 private information allocated and setup
3639          * before it can bring up and give link-local addresses
3640          * to other devices which are up.
3641          *
3642          * Unfortunately, loopback_dev is not necessarily the first
3643          * entry in the global dev_base list of net devices.  In fact,
3644          * it is likely to be the very last entry on that list.
3645          * So this causes the notifier registry below to try and
3646          * give link-local addresses to all devices besides loopback_dev
3647          * first, then loopback_dev, which cases all the non-loopback_dev
3648          * devices to fail to get a link-local address.
3649          *
3650          * So, as a temporary fix, allocate the ipv6 structure for
3651          * loopback_dev first by hand.
3652          * Longer term, all of the dependencies ipv6 has upon the loopback
3653          * device and it being up should be removed.
3654          */
3655         rtnl_lock();
3656         if (!ipv6_add_dev(&loopback_dev))
3657                 err = -ENOMEM;
3658         rtnl_unlock();
3659         if (err)
3660                 return err;
3661
3662         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3663
3664         register_netdevice_notifier(&ipv6_dev_notf);
3665
3666 #ifdef CONFIG_IPV6_PRIVACY
3667         md5_tfm = crypto_alloc_tfm("md5", 0);
3668         if (unlikely(md5_tfm == NULL))
3669                 printk(KERN_WARNING
3670                         "failed to load transform for md5\n");
3671 #endif
3672
3673         addrconf_verify(0);
3674         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3675 #ifdef CONFIG_SYSCTL
3676         addrconf_sysctl.sysctl_header =
3677                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3678         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3679 #endif
3680
3681         return 0;
3682 }
3683
3684 void __exit addrconf_cleanup(void)
3685 {
3686         struct net_device *dev;
3687         struct inet6_dev *idev;
3688         struct inet6_ifaddr *ifa;
3689         int i;
3690
3691         unregister_netdevice_notifier(&ipv6_dev_notf);
3692
3693         rtnetlink_links[PF_INET6] = NULL;
3694 #ifdef CONFIG_SYSCTL
3695         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3696         addrconf_sysctl_unregister(&ipv6_devconf);
3697 #endif
3698
3699         rtnl_lock();
3700
3701         /*
3702          *      clean dev list.
3703          */
3704
3705         for (dev=dev_base; dev; dev=dev->next) {
3706                 if ((idev = __in6_dev_get(dev)) == NULL)
3707                         continue;
3708                 addrconf_ifdown(dev, 1);
3709         }
3710         addrconf_ifdown(&loopback_dev, 2);
3711
3712         /*
3713          *      Check hash table.
3714          */
3715
3716         write_lock_bh(&addrconf_hash_lock);
3717         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3718                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3719                         struct inet6_ifaddr *bifa;
3720
3721                         bifa = ifa;
3722                         ifa = ifa->lst_next;
3723                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3724                         /* Do not free it; something is wrong.
3725                            Now we can investigate it with debugger.
3726                          */
3727                 }
3728         }
3729         write_unlock_bh(&addrconf_hash_lock);
3730
3731         del_timer(&addr_chk_timer);
3732
3733         rtnl_unlock();
3734
3735 #ifdef CONFIG_IPV6_PRIVACY
3736         crypto_free_tfm(md5_tfm);
3737         md5_tfm = NULL;
3738 #endif
3739
3740 #ifdef CONFIG_PROC_FS
3741         proc_net_remove("if_inet6");
3742 #endif
3743 }