net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/config.h>
  44 #include <linux/errno.h>
  45 #include <linux/types.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/sched.h>
  49 #include <linux/net.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #ifdef CONFIG_SYSCTL
  59 #include <linux/sysctl.h>
  60 #endif
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/sock.h>
  66 #include <net/snmp.h>
  67
  68 #include <net/ipv6.h>
  69 #include <net/protocol.h>
  70 #include <net/ndisc.h>
  71 #include <net/ip6_route.h>
  72 #include <net/addrconf.h>
  73 #include <net/tcp.h>
  74 #include <net/ip.h>
  75 #include <linux/if_tunnel.h>
  76 #include <linux/rtnetlink.h>
  77
  78 #ifdef CONFIG_IPV6_PRIVACY
  79 #include <linux/random.h>
  80 #include <linux/crypto.h>
  81 #include <linux/scatterlist.h>
  82 #endif
  83
  84 #include <asm/uaccess.h>
  85
  86 #include <linux/proc_fs.h>
  87 #include <linux/seq_file.h>
  88
  89 /* Set to 3 to get tracing... */
  90 #define ACONF_DEBUG 2
  91
  92 #if ACONF_DEBUG >= 3
  93 #define ADBG(x) printk x
  94 #else
  95 #define ADBG(x)
  96 #endif
  97
  98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 100
 101 #ifdef CONFIG_SYSCTL
 102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 104 #endif
 105
 106 #ifdef CONFIG_IPV6_PRIVACY
 107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 109 static void ipv6_regen_rndid(unsigned long data);
 110
 111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 112 static struct crypto_tfm *md5_tfm;
 113 static DEFINE_SPINLOCK(md5_tfm_lock);
 114 #endif
 115
 116 static int ipv6_count_addresses(struct inet6_dev *idev);
 117
 118 /*
 119  *      Configured unicast address hash table
 120  */
 121 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 122 static DEFINE_RWLOCK(addrconf_hash_lock);
 123
 124 /* Protects inet6 devices */
 125 DEFINE_RWLOCK(addrconf_lock);
 126
 127 static void addrconf_verify(unsigned long);
 128
 129 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 130 static DEFINE_SPINLOCK(addrconf_verify_lock);
 131
 132 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 133 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 134
 135 static int addrconf_ifdown(struct net_device *dev, int how);
 136
 137 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 138 static void addrconf_dad_timer(unsigned long data);
 139 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 140 static void addrconf_rs_timer(unsigned long data);
 141 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 142 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 143
 144 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 145                                 struct prefix_info *pinfo);
 146 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 147
 148 static struct notifier_block *inet6addr_chain;
 149
 150 struct ipv6_devconf ipv6_devconf = {
 151         .forwarding             = 0,
 152         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 153         .mtu6                   = IPV6_MIN_MTU,
 154         .accept_ra              = 1,
 155         .accept_redirects       = 1,
 156         .autoconf               = 1,
 157         .force_mld_version      = 0,
 158         .dad_transmits          = 1,
 159         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 160         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 161         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 162 #ifdef CONFIG_IPV6_PRIVACY
 163         .use_tempaddr           = 0,
 164         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 165         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 166         .regen_max_retry        = REGEN_MAX_RETRY,
 167         .max_desync_factor      = MAX_DESYNC_FACTOR,
 168 #endif
 169         .max_addresses          = IPV6_MAX_ADDRESSES,
 170 };
 171
 172 static struct ipv6_devconf ipv6_devconf_dflt = {
 173         .forwarding             = 0,
 174         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 175         .mtu6                   = IPV6_MIN_MTU,
 176         .accept_ra              = 1,
 177         .accept_redirects       = 1,
 178         .autoconf               = 1,
 179         .dad_transmits          = 1,
 180         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 181         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 182         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 183 #ifdef CONFIG_IPV6_PRIVACY
 184         .use_tempaddr           = 0,
 185         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 186         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 187         .regen_max_retry        = REGEN_MAX_RETRY,
 188         .max_desync_factor      = MAX_DESYNC_FACTOR,
 189 #endif
 190         .max_addresses          = IPV6_MAX_ADDRESSES,
 191 };
 192
 193 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 194 #if 0
 195 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 196 #endif
 197 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 198
 199 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 200
 201 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 202 {
 203         switch(scope) {
 204         case IPV6_ADDR_SCOPE_NODELOCAL:
 205                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 206                         IPV6_ADDR_LOOPBACK);
 207         case IPV6_ADDR_SCOPE_LINKLOCAL:
 208                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 209                         IPV6_ADDR_LINKLOCAL);
 210         case IPV6_ADDR_SCOPE_SITELOCAL:
 211                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 212                         IPV6_ADDR_SITELOCAL);
 213         }
 214         return IPV6_ADDR_SCOPE_TYPE(scope);
 215 }
 216
 217 int __ipv6_addr_type(const struct in6_addr *addr)
 218 {
 219         u32 st;
 220
 221         st = addr->s6_addr32[0];
 222
 223         /* Consider all addresses with the first three bits different of
 224            000 and 111 as unicasts.
 225          */
 226         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 227             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 228                 return (IPV6_ADDR_UNICAST |
 229                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 230
 231         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 232                 /* multicast */
 233                 /* addr-select 3.1 */
 234                 return (IPV6_ADDR_MULTICAST |
 235                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 236         }
 237
 238         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 239                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 240                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 241         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 242                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 243                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 244
 245         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 246                 if (addr->s6_addr32[2] == 0) {
 247                         if (addr->s6_addr32[3] == 0)
 248                                 return IPV6_ADDR_ANY;
 249
 250                         if (addr->s6_addr32[3] == htonl(0x00000001))
 251                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 252                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 253
 254                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 255                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 256                 }
 257
 258                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 259                         return (IPV6_ADDR_MAPPED |
 260                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 261         }
 262
 263         return (IPV6_ADDR_RESERVED |
 264                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 265 }
 266
 267 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 268 {
 269         if (del_timer(&ifp->timer))
 270                 __in6_ifa_put(ifp);
 271 }
 272
 273 enum addrconf_timer_t
 274 {
 275         AC_NONE,
 276         AC_DAD,
 277         AC_RS,
 278 };
 279
 280 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 281                                enum addrconf_timer_t what,
 282                                unsigned long when)
 283 {
 284         if (!del_timer(&ifp->timer))
 285                 in6_ifa_hold(ifp);
 286
 287         switch (what) {
 288         case AC_DAD:
 289                 ifp->timer.function = addrconf_dad_timer;
 290                 break;
 291         case AC_RS:
 292                 ifp->timer.function = addrconf_rs_timer;
 293                 break;
 294         default:;
 295         }
 296         ifp->timer.expires = jiffies + when;
 297         add_timer(&ifp->timer);
 298 }
 299
 300 /* Nobody refers to this device, we may destroy it. */
 301
 302 void in6_dev_finish_destroy(struct inet6_dev *idev)
 303 {
 304         struct net_device *dev = idev->dev;
 305         BUG_TRAP(idev->addr_list==NULL);
 306         BUG_TRAP(idev->mc_list==NULL);
 307 #ifdef NET_REFCNT_DEBUG
 308         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 309 #endif
 310         dev_put(dev);
 311         if (!idev->dead) {
 312                 printk("Freeing alive inet6 device %p\n", idev);
 313                 return;
 314         }
 315         snmp6_free_dev(idev);
 316         kfree(idev);
 317 }
 318
 319 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 320 {
 321         struct inet6_dev *ndev;
 322
 323         ASSERT_RTNL();
 324
 325         if (dev->mtu < IPV6_MIN_MTU)
 326                 return NULL;
 327
 328         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 329
 330         if (ndev) {
 331                 memset(ndev, 0, sizeof(struct inet6_dev));
 332
 333                 rwlock_init(&ndev->lock);
 334                 ndev->dev = dev;
 335                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 336                 ndev->cnf.mtu6 = dev->mtu;
 337                 ndev->cnf.sysctl = NULL;
 338                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 339                 if (ndev->nd_parms == NULL) {
 340                         kfree(ndev);
 341                         return NULL;
 342                 }
 343                 /* We refer to the device */
 344                 dev_hold(dev);
 345
 346                 if (snmp6_alloc_dev(ndev) < 0) {
 347                         ADBG((KERN_WARNING
 348                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
 349                                 __FUNCTION__, dev->name));
 350                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 351                         ndev->dead = 1;
 352                         in6_dev_finish_destroy(ndev);
 353                         return NULL;
 354                 }
 355
 356                 if (snmp6_register_dev(ndev) < 0) {
 357                         ADBG((KERN_WARNING
 358                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 359                                 __FUNCTION__, dev->name));
 360                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 361                         ndev->dead = 1;
 362                         in6_dev_finish_destroy(ndev);
 363                         return NULL;
 364                 }
 365
 366                 /* One reference from device.  We must do this before
 367                  * we invoke __ipv6_regen_rndid().
 368                  */
 369                 in6_dev_hold(ndev);
 370
 371 #ifdef CONFIG_IPV6_PRIVACY
 372                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
 373                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
 374                 init_timer(&ndev->regen_timer);
 375                 ndev->regen_timer.function = ipv6_regen_rndid;
 376                 ndev->regen_timer.data = (unsigned long) ndev;
 377                 if ((dev->flags&IFF_LOOPBACK) ||
 378                     dev->type == ARPHRD_TUNNEL ||
 379                     dev->type == ARPHRD_NONE ||
 380                     dev->type == ARPHRD_SIT) {
 381                         printk(KERN_INFO
 382                                 "Disabled Privacy Extensions on device %p(%s)\n",
 383                                 dev, dev->name);
 384                         ndev->cnf.use_tempaddr = -1;
 385                 } else {
 386                         in6_dev_hold(ndev);
 387                         ipv6_regen_rndid((unsigned long) ndev);
 388                 }
 389 #endif
 390
 391                 write_lock_bh(&addrconf_lock);
 392                 dev->ip6_ptr = ndev;
 393                 write_unlock_bh(&addrconf_lock);
 394
 395                 ipv6_mc_init_dev(ndev);
 396                 ndev->tstamp = jiffies;
 397 #ifdef CONFIG_SYSCTL
 398                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 399                                       NET_IPV6_NEIGH, "ipv6",
 400                                       &ndisc_ifinfo_sysctl_change,
 401                                       NULL);
 402                 addrconf_sysctl_register(ndev, &ndev->cnf);
 403 #endif
 404         }
 405         return ndev;
 406 }
 407
 408 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 409 {
 410         struct inet6_dev *idev;
 411
 412         ASSERT_RTNL();
 413
 414         if ((idev = __in6_dev_get(dev)) == NULL) {
 415                 if ((idev = ipv6_add_dev(dev)) == NULL)
 416                         return NULL;
 417         }
 418         if (dev->flags&IFF_UP)
 419                 ipv6_mc_up(idev);
 420         return idev;
 421 }
 422
 423 #ifdef CONFIG_SYSCTL
 424 static void dev_forward_change(struct inet6_dev *idev)
 425 {
 426         struct net_device *dev;
 427         struct inet6_ifaddr *ifa;
 428         struct in6_addr addr;
 429
 430         if (!idev)
 431                 return;
 432         dev = idev->dev;
 433         if (dev && (dev->flags & IFF_MULTICAST)) {
 434                 ipv6_addr_all_routers(&addr);
 435
 436                 if (idev->cnf.forwarding)
 437                         ipv6_dev_mc_inc(dev, &addr);
 438                 else
 439                         ipv6_dev_mc_dec(dev, &addr);
 440         }
 441         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 442                 if (idev->cnf.forwarding)
 443                         addrconf_join_anycast(ifa);
 444                 else
 445                         addrconf_leave_anycast(ifa);
 446         }
 447 }
 448
 449
 450 static void addrconf_forward_change(void)
 451 {
 452         struct net_device *dev;
 453         struct inet6_dev *idev;
 454
 455         read_lock(&dev_base_lock);
 456         for (dev=dev_base; dev; dev=dev->next) {
 457                 read_lock(&addrconf_lock);
 458                 idev = __in6_dev_get(dev);
 459                 if (idev) {
 460                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 461                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 462                         if (changed)
 463                                 dev_forward_change(idev);
 464                 }
 465                 read_unlock(&addrconf_lock);
 466         }
 467         read_unlock(&dev_base_lock);
 468 }
 469 #endif
 470
 471 /* Nobody refers to this ifaddr, destroy it */
 472
 473 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 474 {
 475         BUG_TRAP(ifp->if_next==NULL);
 476         BUG_TRAP(ifp->lst_next==NULL);
 477 #ifdef NET_REFCNT_DEBUG
 478         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 479 #endif
 480
 481         in6_dev_put(ifp->idev);
 482
 483         if (del_timer(&ifp->timer))
 484                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 485
 486         if (!ifp->dead) {
 487                 printk("Freeing alive inet6 address %p\n", ifp);
 488                 return;
 489         }
 490         dst_release(&ifp->rt->u.dst);
 491
 492         kfree(ifp);
 493 }
 494
 495 /* On success it returns ifp with increased reference count */
 496
 497 static struct inet6_ifaddr *
 498 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 499               int scope, u32 flags)
 500 {
 501         struct inet6_ifaddr *ifa = NULL;
 502         struct rt6_info *rt;
 503         int hash;
 504         int err = 0;
 505
 506         read_lock_bh(&addrconf_lock);
 507         if (idev->dead) {
 508                 err = -ENODEV;                  /*XXX*/
 509                 goto out2;
 510         }
 511
 512         write_lock(&addrconf_hash_lock);
 513
 514         /* Ignore adding duplicate addresses on an interface */
 515         if (ipv6_chk_same_addr(addr, idev->dev)) {
 516                 ADBG(("ipv6_add_addr: already assigned\n"));
 517                 err = -EEXIST;
 518                 goto out;
 519         }
 520
 521         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 522
 523         if (ifa == NULL) {
 524                 ADBG(("ipv6_add_addr: malloc failed\n"));
 525                 err = -ENOBUFS;
 526                 goto out;
 527         }
 528
 529         rt = addrconf_dst_alloc(idev, addr, 0);
 530         if (IS_ERR(rt)) {
 531                 err = PTR_ERR(rt);
 532                 goto out;
 533         }
 534
 535         memset(ifa, 0, sizeof(struct inet6_ifaddr));
 536         ipv6_addr_copy(&ifa->addr, addr);
 537
 538         spin_lock_init(&ifa->lock);
 539         init_timer(&ifa->timer);
 540         ifa->timer.data = (unsigned long) ifa;
 541         ifa->scope = scope;
 542         ifa->prefix_len = pfxlen;
 543         ifa->flags = flags | IFA_F_TENTATIVE;
 544         ifa->cstamp = ifa->tstamp = jiffies;
 545
 546         ifa->idev = idev;
 547         in6_dev_hold(idev);
 548         /* For caller */
 549         in6_ifa_hold(ifa);
 550
 551         /* Add to big hash table */
 552         hash = ipv6_addr_hash(addr);
 553
 554         ifa->lst_next = inet6_addr_lst[hash];
 555         inet6_addr_lst[hash] = ifa;
 556         in6_ifa_hold(ifa);
 557         write_unlock(&addrconf_hash_lock);
 558
 559         write_lock(&idev->lock);
 560         /* Add to inet6_dev unicast addr list. */
 561         ifa->if_next = idev->addr_list;
 562         idev->addr_list = ifa;
 563
 564 #ifdef CONFIG_IPV6_PRIVACY
 565         if (ifa->flags&IFA_F_TEMPORARY) {
 566                 ifa->tmp_next = idev->tempaddr_list;
 567                 idev->tempaddr_list = ifa;
 568                 in6_ifa_hold(ifa);
 569         }
 570 #endif
 571
 572         ifa->rt = rt;
 573
 574         in6_ifa_hold(ifa);
 575         write_unlock(&idev->lock);
 576 out2:
 577         read_unlock_bh(&addrconf_lock);
 578
 579         if (likely(err == 0))
 580                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 581         else {
 582                 kfree(ifa);
 583                 ifa = ERR_PTR(err);
 584         }
 585
 586         return ifa;
 587 out:
 588         write_unlock(&addrconf_hash_lock);
 589         goto out2;
 590 }
 591
 592 /* This function wants to get referenced ifp and releases it before return */
 593
 594 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 595 {
 596         struct inet6_ifaddr *ifa, **ifap;
 597         struct inet6_dev *idev = ifp->idev;
 598         int hash;
 599         int deleted = 0, onlink = 0;
 600         unsigned long expires = jiffies;
 601
 602         hash = ipv6_addr_hash(&ifp->addr);
 603
 604         ifp->dead = 1;
 605
 606         write_lock_bh(&addrconf_hash_lock);
 607         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 608              ifap = &ifa->lst_next) {
 609                 if (ifa == ifp) {
 610                         *ifap = ifa->lst_next;
 611                         __in6_ifa_put(ifp);
 612                         ifa->lst_next = NULL;
 613                         break;
 614                 }
 615         }
 616         write_unlock_bh(&addrconf_hash_lock);
 617
 618         write_lock_bh(&idev->lock);
 619 #ifdef CONFIG_IPV6_PRIVACY
 620         if (ifp->flags&IFA_F_TEMPORARY) {
 621                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 622                      ifap = &ifa->tmp_next) {
 623                         if (ifa == ifp) {
 624                                 *ifap = ifa->tmp_next;
 625                                 if (ifp->ifpub) {
 626                                         in6_ifa_put(ifp->ifpub);
 627                                         ifp->ifpub = NULL;
 628                                 }
 629                                 __in6_ifa_put(ifp);
 630                                 ifa->tmp_next = NULL;
 631                                 break;
 632                         }
 633                 }
 634         }
 635 #endif
 636
 637         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
 638              ifap = &ifa->if_next) {
 639                 if (ifa == ifp) {
 640                         *ifap = ifa->if_next;
 641                         __in6_ifa_put(ifp);
 642                         ifa->if_next = NULL;
 643                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 644                                 break;
 645                         deleted = 1;
 646                 } else if (ifp->flags & IFA_F_PERMANENT) {
 647                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 648                                               ifp->prefix_len)) {
 649                                 if (ifa->flags & IFA_F_PERMANENT) {
 650                                         onlink = 1;
 651                                         if (deleted)
 652                                                 break;
 653                                 } else {
 654                                         unsigned long lifetime;
 655
 656                                         if (!onlink)
 657                                                 onlink = -1;
 658
 659                                         spin_lock(&ifa->lock);
 660                                         lifetime = min_t(unsigned long,
 661                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 662                                         if (time_before(expires,
 663                                                         ifa->tstamp + lifetime * HZ))
 664                                                 expires = ifa->tstamp + lifetime * HZ;
 665                                         spin_unlock(&ifa->lock);
 666                                 }
 667                         }
 668                 }
 669         }
 670         write_unlock_bh(&idev->lock);
 671
 672         ipv6_ifa_notify(RTM_DELADDR, ifp);
 673
 674         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
 675
 676         addrconf_del_timer(ifp);
 677
 678         /*
 679          * Purge or update corresponding prefix
 680          *
 681          * 1) we don't purge prefix here if address was not permanent.
 682          *    prefix is managed by its own lifetime.
 683          * 2) if there're no addresses, delete prefix.
 684          * 3) if there're still other permanent address(es),
 685          *    corresponding prefix is still permanent.
 686          * 4) otherwise, update prefix lifetime to the
 687          *    longest valid lifetime among the corresponding
 688          *    addresses on the device.
 689          *    Note: subsequent RA will update lifetime.
 690          *
 691          * --yoshfuji
 692          */
 693         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 694                 struct in6_addr prefix;
 695                 struct rt6_info *rt;
 696
 697                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 698                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 699
 700                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 701                         if (onlink == 0) {
 702                                 ip6_del_rt(rt, NULL, NULL, NULL);
 703                                 rt = NULL;
 704                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 705                                 rt->rt6i_expires = expires;
 706                                 rt->rt6i_flags |= RTF_EXPIRES;
 707                         }
 708                 }
 709                 dst_release(&rt->u.dst);
 710         }
 711
 712         in6_ifa_put(ifp);
 713 }
 714
 715 #ifdef CONFIG_IPV6_PRIVACY
 716 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 717 {
 718         struct inet6_dev *idev = ifp->idev;
 719         struct in6_addr addr, *tmpaddr;
 720         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 721         int tmp_plen;
 722         int ret = 0;
 723         int max_addresses;
 724
 725         write_lock(&idev->lock);
 726         if (ift) {
 727                 spin_lock_bh(&ift->lock);
 728                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 729                 spin_unlock_bh(&ift->lock);
 730                 tmpaddr = &addr;
 731         } else {
 732                 tmpaddr = NULL;
 733         }
 734 retry:
 735         in6_dev_hold(idev);
 736         if (idev->cnf.use_tempaddr <= 0) {
 737                 write_unlock(&idev->lock);
 738                 printk(KERN_INFO
 739                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 740                 in6_dev_put(idev);
 741                 ret = -1;
 742                 goto out;
 743         }
 744         spin_lock_bh(&ifp->lock);
 745         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 746                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 747                 spin_unlock_bh(&ifp->lock);
 748                 write_unlock(&idev->lock);
 749                 printk(KERN_WARNING
 750                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 751                 in6_dev_put(idev);
 752                 ret = -1;
 753                 goto out;
 754         }
 755         in6_ifa_hold(ifp);
 756         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 757         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 758                 spin_unlock_bh(&ifp->lock);
 759                 write_unlock(&idev->lock);
 760                 printk(KERN_WARNING
 761                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 762                 in6_ifa_put(ifp);
 763                 in6_dev_put(idev);
 764                 ret = -1;
 765                 goto out;
 766         }
 767         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 768         tmp_valid_lft = min_t(__u32,
 769                               ifp->valid_lft,
 770                               idev->cnf.temp_valid_lft);
 771         tmp_prefered_lft = min_t(__u32,
 772                                  ifp->prefered_lft,
 773                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 774         tmp_plen = ifp->prefix_len;
 775         max_addresses = idev->cnf.max_addresses;
 776         tmp_cstamp = ifp->cstamp;
 777         tmp_tstamp = ifp->tstamp;
 778         spin_unlock_bh(&ifp->lock);
 779
 780         write_unlock(&idev->lock);
 781         ift = !max_addresses ||
 782               ipv6_count_addresses(idev) < max_addresses ?
 783                 ipv6_add_addr(idev, &addr, tmp_plen,
 784                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 785         if (!ift || IS_ERR(ift)) {
 786                 in6_ifa_put(ifp);
 787                 in6_dev_put(idev);
 788                 printk(KERN_INFO
 789                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 790                 tmpaddr = &addr;
 791                 write_lock(&idev->lock);
 792                 goto retry;
 793         }
 794
 795         spin_lock_bh(&ift->lock);
 796         ift->ifpub = ifp;
 797         ift->valid_lft = tmp_valid_lft;
 798         ift->prefered_lft = tmp_prefered_lft;
 799         ift->cstamp = tmp_cstamp;
 800         ift->tstamp = tmp_tstamp;
 801         spin_unlock_bh(&ift->lock);
 802
 803         addrconf_dad_start(ift, 0);
 804         in6_ifa_put(ift);
 805         in6_dev_put(idev);
 806 out:
 807         return ret;
 808 }
 809 #endif
 810
 811 /*
 812  *      Choose an appropriate source address (RFC3484)
 813  */
 814 struct ipv6_saddr_score {
 815         int             addr_type;
 816         unsigned int    attrs;
 817         int             matchlen;
 818         unsigned int    scope;
 819         unsigned int    rule;
 820 };
 821
 822 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 823 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 824 #define IPV6_SADDR_SCORE_HOA            0x0008
 825 #define IPV6_SADDR_SCORE_OIF            0x0010
 826 #define IPV6_SADDR_SCORE_LABEL          0x0020
 827 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 828
 829 static int inline ipv6_saddr_preferred(int type)
 830 {
 831         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 832                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 833                 return 1;
 834         return 0;
 835 }
 836
 837 /* static matching label */
 838 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 839 {
 840  /*
 841   *     prefix (longest match)  label
 842   *     -----------------------------
 843   *     ::1/128                 0
 844   *     ::/0                    1
 845   *     2002::/16               2
 846   *     ::/96                   3
 847   *     ::ffff:0:0/96           4
 848   */
 849         if (type & IPV6_ADDR_LOOPBACK)
 850                 return 0;
 851         else if (type & IPV6_ADDR_COMPATv4)
 852                 return 3;
 853         else if (type & IPV6_ADDR_MAPPED)
 854                 return 4;
 855         else if (addr->s6_addr16[0] == htons(0x2002))
 856                 return 2;
 857         return 1;
 858 }
 859
 860 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 861                        struct in6_addr *daddr, struct in6_addr *saddr)
 862 {
 863         struct ipv6_saddr_score hiscore;
 864         struct inet6_ifaddr *ifa_result = NULL;
 865         int daddr_type = __ipv6_addr_type(daddr);
 866         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 867         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 868         struct net_device *dev;
 869
 870         memset(&hiscore, 0, sizeof(hiscore));
 871
 872         read_lock(&dev_base_lock);
 873         read_lock(&addrconf_lock);
 874
 875         for (dev = dev_base; dev; dev=dev->next) {
 876                 struct inet6_dev *idev;
 877                 struct inet6_ifaddr *ifa;
 878
 879                 /* Rule 0: Candidate Source Address (section 4)
 880                  *  - multicast and link-local destination address,
 881                  *    the set of candidate source address MUST only
 882                  *    include addresses assigned to interfaces
 883                  *    belonging to the same link as the outgoing
 884                  *    interface.
 885                  * (- For site-local destination addresses, the
 886                  *    set of candidate source addresses MUST only
 887                  *    include addresses assigned to interfaces
 888                  *    belonging to the same site as the outgoing
 889                  *    interface.)
 890                  */
 891                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 892                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 893                     daddr_dev && dev != daddr_dev)
 894                         continue;
 895
 896                 idev = __in6_dev_get(dev);
 897                 if (!idev)
 898                         continue;
 899
 900                 read_lock_bh(&idev->lock);
 901                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 902                         struct ipv6_saddr_score score;
 903
 904                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 905
 906                         /* Rule 0: Candidate Source Address (section 4)
 907                          *  - In any case, anycast addresses, multicast
 908                          *    addresses, and the unspecified address MUST
 909                          *    NOT be included in a candidate set.
 910                          */
 911                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 912                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 913                                 LIMIT_NETDEBUG(KERN_DEBUG
 914                                                "ADDRCONF: unspecified / multicast address"
 915                                                "assigned as unicast address on %s",
 916                                                dev->name);
 917                                 continue;
 918                         }
 919
 920                         score.attrs = 0;
 921                         score.matchlen = 0;
 922                         score.scope = 0;
 923                         score.rule = 0;
 924
 925                         if (ifa_result == NULL) {
 926                                 /* record it if the first available entry */
 927                                 goto record_it;
 928                         }
 929
 930                         /* Rule 1: Prefer same address */
 931                         if (hiscore.rule < 1) {
 932                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 933                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 934                                 hiscore.rule++;
 935                         }
 936                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 937                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 938                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 939                                         score.rule = 1;
 940                                         goto record_it;
 941                                 }
 942                         } else {
 943                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 944                                         continue;
 945                         }
 946
 947                         /* Rule 2: Prefer appropriate scope */
 948                         if (hiscore.rule < 2) {
 949                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 950                                 hiscore.rule++;
 951                         }
 952                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 953                         if (hiscore.scope < score.scope) {
 954                                 if (hiscore.scope < daddr_scope) {
 955                                         score.rule = 2;
 956                                         goto record_it;
 957                                 } else
 958                                         continue;
 959                         } else if (score.scope < hiscore.scope) {
 960                                 if (score.scope < daddr_scope)
 961                                         continue;
 962                                 else {
 963                                         score.rule = 2;
 964                                         goto record_it;
 965                                 }
 966                         }
 967
 968                         /* Rule 3: Avoid deprecated address */
 969                         if (hiscore.rule < 3) {
 970                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 971                                     !(ifa_result->flags & IFA_F_DEPRECATED))
 972                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 973                                 hiscore.rule++;
 974                         }
 975                         if (ipv6_saddr_preferred(score.addr_type) ||
 976                             !(ifa->flags & IFA_F_DEPRECATED)) {
 977                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 978                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
 979                                         score.rule = 3;
 980                                         goto record_it;
 981                                 }
 982                         } else {
 983                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
 984                                         continue;
 985                         }
 986
 987                         /* Rule 4: Prefer home address -- not implemented yet */
 988
 989                         /* Rule 5: Prefer outgoing interface */
 990                         if (hiscore.rule < 5) {
 991                                 if (daddr_dev == NULL ||
 992                                     daddr_dev == ifa_result->idev->dev)
 993                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
 994                                 hiscore.rule++;
 995                         }
 996                         if (daddr_dev == NULL ||
 997                             daddr_dev == ifa->idev->dev) {
 998                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
 999                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1000                                         score.rule = 5;
1001                                         goto record_it;
1002                                 }
1003                         } else {
1004                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1005                                         continue;
1006                         }
1007
1008                         /* Rule 6: Prefer matching label */
1009                         if (hiscore.rule < 6) {
1010                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1011                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1012                                 hiscore.rule++;
1013                         }
1014                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1015                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1016                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1017                                         score.rule = 6;
1018                                         goto record_it;
1019                                 }
1020                         } else {
1021                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1022                                         continue;
1023                         }
1024
1025 #ifdef CONFIG_IPV6_PRIVACY
1026                         /* Rule 7: Prefer public address
1027                          * Note: prefer temprary address if use_tempaddr >= 2
1028                          */
1029                         if (hiscore.rule < 7) {
1030                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1031                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1032                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1033                                 hiscore.rule++;
1034                         }
1035                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1036                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1037                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1038                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1039                                         score.rule = 7;
1040                                         goto record_it;
1041                                 }
1042                         } else {
1043                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1044                                         continue;
1045                         }
1046 #endif
1047                         /* Rule 8: Use longest matching prefix */
1048                         if (hiscore.rule < 8) {
1049                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1050                                 hiscore.rule++;
1051                         }
1052                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1053                         if (score.matchlen > hiscore.matchlen) {
1054                                 score.rule = 8;
1055                                 goto record_it;
1056                         }
1057 #if 0
1058                         else if (score.matchlen < hiscore.matchlen)
1059                                 continue;
1060 #endif
1061
1062                         /* Final Rule: choose first available one */
1063                         continue;
1064 record_it:
1065                         if (ifa_result)
1066                                 in6_ifa_put(ifa_result);
1067                         in6_ifa_hold(ifa);
1068                         ifa_result = ifa;
1069                         hiscore = score;
1070                 }
1071                 read_unlock_bh(&idev->lock);
1072         }
1073         read_unlock(&addrconf_lock);
1074         read_unlock(&dev_base_lock);
1075
1076         if (!ifa_result)
1077                 return -EADDRNOTAVAIL;
1078
1079         ipv6_addr_copy(saddr, &ifa_result->addr);
1080         in6_ifa_put(ifa_result);
1081         return 0;
1082 }
1083
1084
1085 int ipv6_get_saddr(struct dst_entry *dst,
1086                    struct in6_addr *daddr, struct in6_addr *saddr)
1087 {
1088         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1089 }
1090
1091
1092 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1093 {
1094         struct inet6_dev *idev;
1095         int err = -EADDRNOTAVAIL;
1096
1097         read_lock(&addrconf_lock);
1098         if ((idev = __in6_dev_get(dev)) != NULL) {
1099                 struct inet6_ifaddr *ifp;
1100
1101                 read_lock_bh(&idev->lock);
1102                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1103                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1104                                 ipv6_addr_copy(addr, &ifp->addr);
1105                                 err = 0;
1106                                 break;
1107                         }
1108                 }
1109                 read_unlock_bh(&idev->lock);
1110         }
1111         read_unlock(&addrconf_lock);
1112         return err;
1113 }
1114
1115 static int ipv6_count_addresses(struct inet6_dev *idev)
1116 {
1117         int cnt = 0;
1118         struct inet6_ifaddr *ifp;
1119
1120         read_lock_bh(&idev->lock);
1121         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1122                 cnt++;
1123         read_unlock_bh(&idev->lock);
1124         return cnt;
1125 }
1126
1127 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1128 {
1129         struct inet6_ifaddr * ifp;
1130         u8 hash = ipv6_addr_hash(addr);
1131
1132         read_lock_bh(&addrconf_hash_lock);
1133         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1134                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1135                     !(ifp->flags&IFA_F_TENTATIVE)) {
1136                         if (dev == NULL || ifp->idev->dev == dev ||
1137                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1138                                 break;
1139                 }
1140         }
1141         read_unlock_bh(&addrconf_hash_lock);
1142         return ifp != NULL;
1143 }
1144
1145 static
1146 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1147 {
1148         struct inet6_ifaddr * ifp;
1149         u8 hash = ipv6_addr_hash(addr);
1150
1151         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1152                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1153                         if (dev == NULL || ifp->idev->dev == dev)
1154                                 break;
1155                 }
1156         }
1157         return ifp != NULL;
1158 }
1159
1160 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1161 {
1162         struct inet6_ifaddr * ifp;
1163         u8 hash = ipv6_addr_hash(addr);
1164
1165         read_lock_bh(&addrconf_hash_lock);
1166         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1167                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1168                         if (dev == NULL || ifp->idev->dev == dev ||
1169                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1170                                 in6_ifa_hold(ifp);
1171                                 break;
1172                         }
1173                 }
1174         }
1175         read_unlock_bh(&addrconf_hash_lock);
1176
1177         return ifp;
1178 }
1179
1180 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1181 {
1182         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1183         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1184         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1185         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1186         int sk_ipv6only = ipv6_only_sock(sk);
1187         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1188         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1189         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1190
1191         if (!sk2_rcv_saddr && !sk_ipv6only)
1192                 return 1;
1193
1194         if (addr_type2 == IPV6_ADDR_ANY &&
1195             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1196                 return 1;
1197
1198         if (addr_type == IPV6_ADDR_ANY &&
1199             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1200                 return 1;
1201
1202         if (sk2_rcv_saddr6 &&
1203             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1204                 return 1;
1205
1206         if (addr_type == IPV6_ADDR_MAPPED &&
1207             !sk2_ipv6only &&
1208             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1209                 return 1;
1210
1211         return 0;
1212 }
1213
1214 /* Gets referenced address, destroys ifaddr */
1215
1216 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1217 {
1218         if (net_ratelimit())
1219                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1220         if (ifp->flags&IFA_F_PERMANENT) {
1221                 spin_lock_bh(&ifp->lock);
1222                 addrconf_del_timer(ifp);
1223                 ifp->flags |= IFA_F_TENTATIVE;
1224                 spin_unlock_bh(&ifp->lock);
1225                 in6_ifa_put(ifp);
1226 #ifdef CONFIG_IPV6_PRIVACY
1227         } else if (ifp->flags&IFA_F_TEMPORARY) {
1228                 struct inet6_ifaddr *ifpub;
1229                 spin_lock_bh(&ifp->lock);
1230                 ifpub = ifp->ifpub;
1231                 if (ifpub) {
1232                         in6_ifa_hold(ifpub);
1233                         spin_unlock_bh(&ifp->lock);
1234                         ipv6_create_tempaddr(ifpub, ifp);
1235                         in6_ifa_put(ifpub);
1236                 } else {
1237                         spin_unlock_bh(&ifp->lock);
1238                 }
1239                 ipv6_del_addr(ifp);
1240 #endif
1241         } else
1242                 ipv6_del_addr(ifp);
1243 }
1244
1245
1246 /* Join to solicited addr multicast group. */
1247
1248 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1249 {
1250         struct in6_addr maddr;
1251
1252         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1253                 return;
1254
1255         addrconf_addr_solict_mult(addr, &maddr);
1256         ipv6_dev_mc_inc(dev, &maddr);
1257 }
1258
1259 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1260 {
1261         struct in6_addr maddr;
1262
1263         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1264                 return;
1265
1266         addrconf_addr_solict_mult(addr, &maddr);
1267         __ipv6_dev_mc_dec(idev, &maddr);
1268 }
1269
1270 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1271 {
1272         struct in6_addr addr;
1273         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1274         if (ipv6_addr_any(&addr))
1275                 return;
1276         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1277 }
1278
1279 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1280 {
1281         struct in6_addr addr;
1282         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1283         if (ipv6_addr_any(&addr))
1284                 return;
1285         __ipv6_dev_ac_dec(ifp->idev, &addr);
1286 }
1287
1288 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1289 {
1290         switch (dev->type) {
1291         case ARPHRD_ETHER:
1292         case ARPHRD_FDDI:
1293         case ARPHRD_IEEE802_TR:
1294                 if (dev->addr_len != ETH_ALEN)
1295                         return -1;
1296                 memcpy(eui, dev->dev_addr, 3);
1297                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1298
1299                 /*
1300                  * The zSeries OSA network cards can be shared among various
1301                  * OS instances, but the OSA cards have only one MAC address.
1302                  * This leads to duplicate address conflicts in conjunction
1303                  * with IPv6 if more than one instance uses the same card.
1304                  *
1305                  * The driver for these cards can deliver a unique 16-bit
1306                  * identifier for each instance sharing the same card.  It is
1307                  * placed instead of 0xFFFE in the interface identifier.  The
1308                  * "u" bit of the interface identifier is not inverted in this
1309                  * case.  Hence the resulting interface identifier has local
1310                  * scope according to RFC2373.
1311                  */
1312                 if (dev->dev_id) {
1313                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1314                         eui[4] = dev->dev_id & 0xFF;
1315                 } else {
1316                         eui[3] = 0xFF;
1317                         eui[4] = 0xFE;
1318                         eui[0] ^= 2;
1319                 }
1320                 return 0;
1321         case ARPHRD_ARCNET:
1322                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1323                 if (dev->addr_len != ARCNET_ALEN)
1324                         return -1;
1325                 memset(eui, 0, 7);
1326                 eui[7] = *(u8*)dev->dev_addr;
1327                 return 0;
1328         case ARPHRD_INFINIBAND:
1329                 if (dev->addr_len != INFINIBAND_ALEN)
1330                         return -1;
1331                 memcpy(eui, dev->dev_addr + 12, 8);
1332                 eui[0] |= 2;
1333                 return 0;
1334         }
1335         return -1;
1336 }
1337
1338 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1339 {
1340         int err = -1;
1341         struct inet6_ifaddr *ifp;
1342
1343         read_lock_bh(&idev->lock);
1344         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1345                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1346                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1347                         err = 0;
1348                         break;
1349                 }
1350         }
1351         read_unlock_bh(&idev->lock);
1352         return err;
1353 }
1354
1355 #ifdef CONFIG_IPV6_PRIVACY
1356 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1357 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1358 {
1359         struct net_device *dev;
1360         struct scatterlist sg[2];
1361
1362         sg_set_buf(&sg[0], idev->entropy, 8);
1363         sg_set_buf(&sg[1], idev->work_eui64, 8);
1364
1365         dev = idev->dev;
1366
1367         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1368                 printk(KERN_INFO
1369                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1370                         idev);
1371                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1372         }
1373 regen:
1374         spin_lock(&md5_tfm_lock);
1375         if (unlikely(md5_tfm == NULL)) {
1376                 spin_unlock(&md5_tfm_lock);
1377                 return -1;
1378         }
1379         crypto_digest_init(md5_tfm);
1380         crypto_digest_update(md5_tfm, sg, 2);
1381         crypto_digest_final(md5_tfm, idev->work_digest);
1382         spin_unlock(&md5_tfm_lock);
1383
1384         memcpy(idev->rndid, &idev->work_digest[0], 8);
1385         idev->rndid[0] &= ~0x02;
1386         memcpy(idev->entropy, &idev->work_digest[8], 8);
1387
1388         /*
1389          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1390          * check if generated address is not inappropriate
1391          *
1392          *  - Reserved subnet anycast (RFC 2526)
1393          *      11111101 11....11 1xxxxxxx
1394          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1395          *      00-00-5E-FE-xx-xx-xx-xx
1396          *  - value 0
1397          *  - XXX: already assigned to an address on the device
1398          */
1399         if (idev->rndid[0] == 0xfd &&
1400             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1401             (idev->rndid[7]&0x80))
1402                 goto regen;
1403         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1404                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1405                         goto regen;
1406                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1407                         goto regen;
1408         }
1409
1410         return 0;
1411 }
1412
1413 static void ipv6_regen_rndid(unsigned long data)
1414 {
1415         struct inet6_dev *idev = (struct inet6_dev *) data;
1416         unsigned long expires;
1417
1418         read_lock_bh(&addrconf_lock);
1419         write_lock_bh(&idev->lock);
1420
1421         if (idev->dead)
1422                 goto out;
1423
1424         if (__ipv6_regen_rndid(idev) < 0)
1425                 goto out;
1426
1427         expires = jiffies +
1428                 idev->cnf.temp_prefered_lft * HZ -
1429                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1430         if (time_before(expires, jiffies)) {
1431                 printk(KERN_WARNING
1432                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1433                         idev->dev->name);
1434                 goto out;
1435         }
1436
1437         if (!mod_timer(&idev->regen_timer, expires))
1438                 in6_dev_hold(idev);
1439
1440 out:
1441         write_unlock_bh(&idev->lock);
1442         read_unlock_bh(&addrconf_lock);
1443         in6_dev_put(idev);
1444 }
1445
1446 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1447         int ret = 0;
1448
1449         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1450                 ret = __ipv6_regen_rndid(idev);
1451         return ret;
1452 }
1453 #endif
1454
1455 /*
1456  *      Add prefix route.
1457  */
1458
1459 static void
1460 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1461                       unsigned long expires, u32 flags)
1462 {
1463         struct in6_rtmsg rtmsg;
1464
1465         memset(&rtmsg, 0, sizeof(rtmsg));
1466         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1467         rtmsg.rtmsg_dst_len = plen;
1468         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1469         rtmsg.rtmsg_ifindex = dev->ifindex;
1470         rtmsg.rtmsg_info = expires;
1471         rtmsg.rtmsg_flags = RTF_UP|flags;
1472         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1473
1474         /* Prevent useless cloning on PtP SIT.
1475            This thing is done here expecting that the whole
1476            class of non-broadcast devices need not cloning.
1477          */
1478         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1479                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1480
1481         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1482 }
1483
1484 /* Create "default" multicast route to the interface */
1485
1486 static void addrconf_add_mroute(struct net_device *dev)
1487 {
1488         struct in6_rtmsg rtmsg;
1489
1490         memset(&rtmsg, 0, sizeof(rtmsg));
1491         ipv6_addr_set(&rtmsg.rtmsg_dst,
1492                       htonl(0xFF000000), 0, 0, 0);
1493         rtmsg.rtmsg_dst_len = 8;
1494         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1495         rtmsg.rtmsg_ifindex = dev->ifindex;
1496         rtmsg.rtmsg_flags = RTF_UP;
1497         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1498         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1499 }
1500
1501 static void sit_route_add(struct net_device *dev)
1502 {
1503         struct in6_rtmsg rtmsg;
1504
1505         memset(&rtmsg, 0, sizeof(rtmsg));
1506
1507         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1508         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1509
1510         /* prefix length - 96 bits "::d.d.d.d" */
1511         rtmsg.rtmsg_dst_len     = 96;
1512         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1513         rtmsg.rtmsg_ifindex     = dev->ifindex;
1514
1515         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1516 }
1517
1518 static void addrconf_add_lroute(struct net_device *dev)
1519 {
1520         struct in6_addr addr;
1521
1522         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1523         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1524 }
1525
1526 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1527 {
1528         struct inet6_dev *idev;
1529
1530         ASSERT_RTNL();
1531
1532         if ((idev = ipv6_find_idev(dev)) == NULL)
1533                 return NULL;
1534
1535         /* Add default multicast route */
1536         addrconf_add_mroute(dev);
1537
1538         /* Add link local route */
1539         addrconf_add_lroute(dev);
1540         return idev;
1541 }
1542
1543 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1544 {
1545         struct prefix_info *pinfo;
1546         __u32 valid_lft;
1547         __u32 prefered_lft;
1548         int addr_type;
1549         unsigned long rt_expires;
1550         struct inet6_dev *in6_dev;
1551
1552         pinfo = (struct prefix_info *) opt;
1553
1554         if (len < sizeof(struct prefix_info)) {
1555                 ADBG(("addrconf: prefix option too short\n"));
1556                 return;
1557         }
1558
1559         /*
1560          *      Validation checks ([ADDRCONF], page 19)
1561          */
1562
1563         addr_type = ipv6_addr_type(&pinfo->prefix);
1564
1565         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1566                 return;
1567
1568         valid_lft = ntohl(pinfo->valid);
1569         prefered_lft = ntohl(pinfo->prefered);
1570
1571         if (prefered_lft > valid_lft) {
1572                 if (net_ratelimit())
1573                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1574                 return;
1575         }
1576
1577         in6_dev = in6_dev_get(dev);
1578
1579         if (in6_dev == NULL) {
1580                 if (net_ratelimit())
1581                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1582                 return;
1583         }
1584
1585         /*
1586          *      Two things going on here:
1587          *      1) Add routes for on-link prefixes
1588          *      2) Configure prefixes with the auto flag set
1589          */
1590
1591         /* Avoid arithmetic overflow. Really, we could
1592            save rt_expires in seconds, likely valid_lft,
1593            but it would require division in fib gc, that it
1594            not good.
1595          */
1596         if (valid_lft >= 0x7FFFFFFF/HZ)
1597                 rt_expires = 0;
1598         else
1599                 rt_expires = jiffies + valid_lft * HZ;
1600
1601         if (pinfo->onlink) {
1602                 struct rt6_info *rt;
1603                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1604
1605                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1606                         if (rt->rt6i_flags&RTF_EXPIRES) {
1607                                 if (valid_lft == 0) {
1608                                         ip6_del_rt(rt, NULL, NULL, NULL);
1609                                         rt = NULL;
1610                                 } else {
1611                                         rt->rt6i_expires = rt_expires;
1612                                 }
1613                         }
1614                 } else if (valid_lft) {
1615                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1616                                               dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1617                 }
1618                 if (rt)
1619                         dst_release(&rt->u.dst);
1620         }
1621
1622         /* Try to figure out our local address for this prefix */
1623
1624         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1625                 struct inet6_ifaddr * ifp;
1626                 struct in6_addr addr;
1627                 int create = 0, update_lft = 0;
1628
1629                 if (pinfo->prefix_len == 64) {
1630                         memcpy(&addr, &pinfo->prefix, 8);
1631                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1632                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1633                                 in6_dev_put(in6_dev);
1634                                 return;
1635                         }
1636                         goto ok;
1637                 }
1638                 if (net_ratelimit())
1639                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1640                                pinfo->prefix_len);
1641                 in6_dev_put(in6_dev);
1642                 return;
1643
1644 ok:
1645
1646                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1647
1648                 if (ifp == NULL && valid_lft) {
1649                         int max_addresses = in6_dev->cnf.max_addresses;
1650
1651                         /* Do not allow to create too much of autoconfigured
1652                          * addresses; this would be too easy way to crash kernel.
1653                          */
1654                         if (!max_addresses ||
1655                             ipv6_count_addresses(in6_dev) < max_addresses)
1656                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1657                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1658
1659                         if (!ifp || IS_ERR(ifp)) {
1660                                 in6_dev_put(in6_dev);
1661                                 return;
1662                         }
1663
1664                         update_lft = create = 1;
1665                         ifp->cstamp = jiffies;
1666                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1667                 }
1668
1669                 if (ifp) {
1670                         int flags;
1671                         unsigned long now;
1672 #ifdef CONFIG_IPV6_PRIVACY
1673                         struct inet6_ifaddr *ift;
1674 #endif
1675                         u32 stored_lft;
1676
1677                         /* update lifetime (RFC2462 5.5.3 e) */
1678                         spin_lock(&ifp->lock);
1679                         now = jiffies;
1680                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1681                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1682                         else
1683                                 stored_lft = 0;
1684                         if (!update_lft && stored_lft) {
1685                                 if (valid_lft > MIN_VALID_LIFETIME ||
1686                                     valid_lft > stored_lft)
1687                                         update_lft = 1;
1688                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1689                                         /* valid_lft <= stored_lft is always true */
1690                                         /* XXX: IPsec */
1691                                         update_lft = 0;
1692                                 } else {
1693                                         valid_lft = MIN_VALID_LIFETIME;
1694                                         if (valid_lft < prefered_lft)
1695                                                 prefered_lft = valid_lft;
1696                                         update_lft = 1;
1697                                 }
1698                         }
1699
1700                         if (update_lft) {
1701                                 ifp->valid_lft = valid_lft;
1702                                 ifp->prefered_lft = prefered_lft;
1703                                 ifp->tstamp = now;
1704                                 flags = ifp->flags;
1705                                 ifp->flags &= ~IFA_F_DEPRECATED;
1706                                 spin_unlock(&ifp->lock);
1707
1708                                 if (!(flags&IFA_F_TENTATIVE))
1709                                         ipv6_ifa_notify(0, ifp);
1710                         } else
1711                                 spin_unlock(&ifp->lock);
1712
1713 #ifdef CONFIG_IPV6_PRIVACY
1714                         read_lock_bh(&in6_dev->lock);
1715                         /* update all temporary addresses in the list */
1716                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1717                                 /*
1718                                  * When adjusting the lifetimes of an existing
1719                                  * temporary address, only lower the lifetimes.
1720                                  * Implementations must not increase the
1721                                  * lifetimes of an existing temporary address
1722                                  * when processing a Prefix Information Option.
1723                                  */
1724                                 spin_lock(&ift->lock);
1725                                 flags = ift->flags;
1726                                 if (ift->valid_lft > valid_lft &&
1727                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1728                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1729                                 if (ift->prefered_lft > prefered_lft &&
1730                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1731                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1732                                 spin_unlock(&ift->lock);
1733                                 if (!(flags&IFA_F_TENTATIVE))
1734                                         ipv6_ifa_notify(0, ift);
1735                         }
1736
1737                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1738                                 /*
1739                                  * When a new public address is created as described in [ADDRCONF],
1740                                  * also create a new temporary address.
1741                                  */
1742                                 read_unlock_bh(&in6_dev->lock);
1743                                 ipv6_create_tempaddr(ifp, NULL);
1744                         } else {
1745                                 read_unlock_bh(&in6_dev->lock);
1746                         }
1747 #endif
1748                         in6_ifa_put(ifp);
1749                         addrconf_verify(0);
1750                 }
1751         }
1752         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1753         in6_dev_put(in6_dev);
1754 }
1755
1756 /*
1757  *      Set destination address.
1758  *      Special case for SIT interfaces where we create a new "virtual"
1759  *      device.
1760  */
1761 int addrconf_set_dstaddr(void __user *arg)
1762 {
1763         struct in6_ifreq ireq;
1764         struct net_device *dev;
1765         int err = -EINVAL;
1766
1767         rtnl_lock();
1768
1769         err = -EFAULT;
1770         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1771                 goto err_exit;
1772
1773         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1774
1775         err = -ENODEV;
1776         if (dev == NULL)
1777                 goto err_exit;
1778
1779         if (dev->type == ARPHRD_SIT) {
1780                 struct ifreq ifr;
1781                 mm_segment_t    oldfs;
1782                 struct ip_tunnel_parm p;
1783
1784                 err = -EADDRNOTAVAIL;
1785                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1786                         goto err_exit;
1787
1788                 memset(&p, 0, sizeof(p));
1789                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1790                 p.iph.saddr = 0;
1791                 p.iph.version = 4;
1792                 p.iph.ihl = 5;
1793                 p.iph.protocol = IPPROTO_IPV6;
1794                 p.iph.ttl = 64;
1795                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1796
1797                 oldfs = get_fs(); set_fs(KERNEL_DS);
1798                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1799                 set_fs(oldfs);
1800
1801                 if (err == 0) {
1802                         err = -ENOBUFS;
1803                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1804                                 goto err_exit;
1805                         err = dev_open(dev);
1806                 }
1807         }
1808
1809 err_exit:
1810         rtnl_unlock();
1811         return err;
1812 }
1813
1814 /*
1815  *      Manual configuration of address on an interface
1816  */
1817 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1818 {
1819         struct inet6_ifaddr *ifp;
1820         struct inet6_dev *idev;
1821         struct net_device *dev;
1822         int scope;
1823
1824         ASSERT_RTNL();
1825
1826         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1827                 return -ENODEV;
1828
1829         if (!(dev->flags&IFF_UP))
1830                 return -ENETDOWN;
1831
1832         if ((idev = addrconf_add_dev(dev)) == NULL)
1833                 return -ENOBUFS;
1834
1835         scope = ipv6_addr_scope(pfx);
1836
1837         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1838         if (!IS_ERR(ifp)) {
1839                 addrconf_dad_start(ifp, 0);
1840                 in6_ifa_put(ifp);
1841                 return 0;
1842         }
1843
1844         return PTR_ERR(ifp);
1845 }
1846
1847 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1848 {
1849         struct inet6_ifaddr *ifp;
1850         struct inet6_dev *idev;
1851         struct net_device *dev;
1852
1853         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1854                 return -ENODEV;
1855
1856         if ((idev = __in6_dev_get(dev)) == NULL)
1857                 return -ENXIO;
1858
1859         read_lock_bh(&idev->lock);
1860         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1861                 if (ifp->prefix_len == plen &&
1862                     ipv6_addr_equal(pfx, &ifp->addr)) {
1863                         in6_ifa_hold(ifp);
1864                         read_unlock_bh(&idev->lock);
1865
1866                         ipv6_del_addr(ifp);
1867
1868                         /* If the last address is deleted administratively,
1869                            disable IPv6 on this interface.
1870                          */
1871                         if (idev->addr_list == NULL)
1872                                 addrconf_ifdown(idev->dev, 1);
1873                         return 0;
1874                 }
1875         }
1876         read_unlock_bh(&idev->lock);
1877         return -EADDRNOTAVAIL;
1878 }
1879
1880
1881 int addrconf_add_ifaddr(void __user *arg)
1882 {
1883         struct in6_ifreq ireq;
1884         int err;
1885
1886         if (!capable(CAP_NET_ADMIN))
1887                 return -EPERM;
1888
1889         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1890                 return -EFAULT;
1891
1892         rtnl_lock();
1893         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1894         rtnl_unlock();
1895         return err;
1896 }
1897
1898 int addrconf_del_ifaddr(void __user *arg)
1899 {
1900         struct in6_ifreq ireq;
1901         int err;
1902
1903         if (!capable(CAP_NET_ADMIN))
1904                 return -EPERM;
1905
1906         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1907                 return -EFAULT;
1908
1909         rtnl_lock();
1910         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1911         rtnl_unlock();
1912         return err;
1913 }
1914
1915 static void sit_add_v4_addrs(struct inet6_dev *idev)
1916 {
1917         struct inet6_ifaddr * ifp;
1918         struct in6_addr addr;
1919         struct net_device *dev;
1920         int scope;
1921
1922         ASSERT_RTNL();
1923
1924         memset(&addr, 0, sizeof(struct in6_addr));
1925         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1926
1927         if (idev->dev->flags&IFF_POINTOPOINT) {
1928                 addr.s6_addr32[0] = htonl(0xfe800000);
1929                 scope = IFA_LINK;
1930         } else {
1931                 scope = IPV6_ADDR_COMPATv4;
1932         }
1933
1934         if (addr.s6_addr32[3]) {
1935                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1936                 if (!IS_ERR(ifp)) {
1937                         spin_lock_bh(&ifp->lock);
1938                         ifp->flags &= ~IFA_F_TENTATIVE;
1939                         spin_unlock_bh(&ifp->lock);
1940                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1941                         in6_ifa_put(ifp);
1942                 }
1943                 return;
1944         }
1945
1946         for (dev = dev_base; dev != NULL; dev = dev->next) {
1947                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1948                 if (in_dev && (dev->flags & IFF_UP)) {
1949                         struct in_ifaddr * ifa;
1950
1951                         int flag = scope;
1952
1953                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1954                                 int plen;
1955
1956                                 addr.s6_addr32[3] = ifa->ifa_local;
1957
1958                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1959                                         continue;
1960                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1961                                         if (idev->dev->flags&IFF_POINTOPOINT)
1962                                                 continue;
1963                                         flag |= IFA_HOST;
1964                                 }
1965                                 if (idev->dev->flags&IFF_POINTOPOINT)
1966                                         plen = 64;
1967                                 else
1968                                         plen = 96;
1969
1970                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1971                                                     IFA_F_PERMANENT);
1972                                 if (!IS_ERR(ifp)) {
1973                                         spin_lock_bh(&ifp->lock);
1974                                         ifp->flags &= ~IFA_F_TENTATIVE;
1975                                         spin_unlock_bh(&ifp->lock);
1976                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1977                                         in6_ifa_put(ifp);
1978                                 }
1979                         }
1980                 }
1981         }
1982 }
1983
1984 static void init_loopback(struct net_device *dev)
1985 {
1986         struct inet6_dev  *idev;
1987         struct inet6_ifaddr * ifp;
1988
1989         /* ::1 */
1990
1991         ASSERT_RTNL();
1992
1993         if ((idev = ipv6_find_idev(dev)) == NULL) {
1994                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1995                 return;
1996         }
1997
1998         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1999         if (!IS_ERR(ifp)) {
2000                 spin_lock_bh(&ifp->lock);
2001                 ifp->flags &= ~IFA_F_TENTATIVE;
2002                 spin_unlock_bh(&ifp->lock);
2003                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2004                 in6_ifa_put(ifp);
2005         }
2006 }
2007
2008 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2009 {
2010         struct inet6_ifaddr * ifp;
2011
2012         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2013         if (!IS_ERR(ifp)) {
2014                 addrconf_dad_start(ifp, 0);
2015                 in6_ifa_put(ifp);
2016         }
2017 }
2018
2019 static void addrconf_dev_config(struct net_device *dev)
2020 {
2021         struct in6_addr addr;
2022         struct inet6_dev    * idev;
2023
2024         ASSERT_RTNL();
2025
2026         if ((dev->type != ARPHRD_ETHER) &&
2027             (dev->type != ARPHRD_FDDI) &&
2028             (dev->type != ARPHRD_IEEE802_TR) &&
2029             (dev->type != ARPHRD_ARCNET) &&
2030             (dev->type != ARPHRD_INFINIBAND)) {
2031                 /* Alas, we support only Ethernet autoconfiguration. */
2032                 return;
2033         }
2034
2035         idev = addrconf_add_dev(dev);
2036         if (idev == NULL)
2037                 return;
2038
2039         memset(&addr, 0, sizeof(struct in6_addr));
2040         addr.s6_addr32[0] = htonl(0xFE800000);
2041
2042         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2043                 addrconf_add_linklocal(idev, &addr);
2044 }
2045
2046 static void addrconf_sit_config(struct net_device *dev)
2047 {
2048         struct inet6_dev *idev;
2049
2050         ASSERT_RTNL();
2051
2052         /*
2053          * Configure the tunnel with one of our IPv4
2054          * addresses... we should configure all of
2055          * our v4 addrs in the tunnel
2056          */
2057
2058         if ((idev = ipv6_find_idev(dev)) == NULL) {
2059                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2060                 return;
2061         }
2062
2063         sit_add_v4_addrs(idev);
2064
2065         if (dev->flags&IFF_POINTOPOINT) {
2066                 addrconf_add_mroute(dev);
2067                 addrconf_add_lroute(dev);
2068         } else
2069                 sit_route_add(dev);
2070 }
2071
2072 static inline int
2073 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2074 {
2075         struct in6_addr lladdr;
2076
2077         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2078                 addrconf_add_linklocal(idev, &lladdr);
2079                 return 0;
2080         }
2081         return -1;
2082 }
2083
2084 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2085 {
2086         struct net_device *link_dev;
2087
2088         /* first try to inherit the link-local address from the link device */
2089         if (idev->dev->iflink &&
2090             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2091                 if (!ipv6_inherit_linklocal(idev, link_dev))
2092                         return;
2093         }
2094         /* then try to inherit it from any device */
2095         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2096                 if (!ipv6_inherit_linklocal(idev, link_dev))
2097                         return;
2098         }
2099         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2100 }
2101
2102 /*
2103  * Autoconfigure tunnel with a link-local address so routing protocols,
2104  * DHCPv6, MLD etc. can be run over the virtual link
2105  */
2106
2107 static void addrconf_ip6_tnl_config(struct net_device *dev)
2108 {
2109         struct inet6_dev *idev;
2110
2111         ASSERT_RTNL();
2112
2113         if ((idev = addrconf_add_dev(dev)) == NULL) {
2114                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2115                 return;
2116         }
2117         ip6_tnl_add_linklocal(idev);
2118         addrconf_add_mroute(dev);
2119 }
2120
2121 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2122                            void * data)
2123 {
2124         struct net_device *dev = (struct net_device *) data;
2125         struct inet6_dev *idev = __in6_dev_get(dev);
2126
2127         switch(event) {
2128         case NETDEV_UP:
2129                 switch(dev->type) {
2130                 case ARPHRD_SIT:
2131                         addrconf_sit_config(dev);
2132                         break;
2133                 case ARPHRD_TUNNEL6:
2134                         addrconf_ip6_tnl_config(dev);
2135                         break;
2136                 case ARPHRD_LOOPBACK:
2137                         init_loopback(dev);
2138                         break;
2139
2140                 default:
2141                         addrconf_dev_config(dev);
2142                         break;
2143                 };
2144                 if (idev) {
2145                         /* If the MTU changed during the interface down, when the
2146                            interface up, the changed MTU must be reflected in the
2147                            idev as well as routers.
2148                          */
2149                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2150                                 rt6_mtu_change(dev, dev->mtu);
2151                                 idev->cnf.mtu6 = dev->mtu;
2152                         }
2153                         idev->tstamp = jiffies;
2154                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2155                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2156                            stop IPv6 on this interface.
2157                          */
2158                         if (dev->mtu < IPV6_MIN_MTU)
2159                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2160                 }
2161                 break;
2162
2163         case NETDEV_CHANGEMTU:
2164                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2165                         rt6_mtu_change(dev, dev->mtu);
2166                         idev->cnf.mtu6 = dev->mtu;
2167                         break;
2168                 }
2169
2170                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2171
2172         case NETDEV_DOWN:
2173         case NETDEV_UNREGISTER:
2174                 /*
2175                  *      Remove all addresses from this interface.
2176                  */
2177                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2178                 break;
2179         case NETDEV_CHANGE:
2180                 break;
2181         case NETDEV_CHANGENAME:
2182 #ifdef CONFIG_SYSCTL
2183                 if (idev) {
2184                         addrconf_sysctl_unregister(&idev->cnf);
2185                         neigh_sysctl_unregister(idev->nd_parms);
2186                         neigh_sysctl_register(dev, idev->nd_parms,
2187                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2188                                               &ndisc_ifinfo_sysctl_change,
2189                                               NULL);
2190                         addrconf_sysctl_register(idev, &idev->cnf);
2191                 }
2192 #endif
2193                 break;
2194         };
2195
2196         return NOTIFY_OK;
2197 }
2198
2199 /*
2200  *      addrconf module should be notified of a device going up
2201  */
2202 static struct notifier_block ipv6_dev_notf = {
2203         .notifier_call = addrconf_notify,
2204         .priority = 0
2205 };
2206
2207 static int addrconf_ifdown(struct net_device *dev, int how)
2208 {
2209         struct inet6_dev *idev;
2210         struct inet6_ifaddr *ifa, **bifa;
2211         int i;
2212
2213         ASSERT_RTNL();
2214
2215         if (dev == &loopback_dev && how == 1)
2216                 how = 0;
2217
2218         rt6_ifdown(dev);
2219         neigh_ifdown(&nd_tbl, dev);
2220
2221         idev = __in6_dev_get(dev);
2222         if (idev == NULL)
2223                 return -ENODEV;
2224
2225         /* Step 1: remove reference to ipv6 device from parent device.
2226                    Do not dev_put!
2227          */
2228         if (how == 1) {
2229                 write_lock_bh(&addrconf_lock);
2230                 dev->ip6_ptr = NULL;
2231                 idev->dead = 1;
2232                 write_unlock_bh(&addrconf_lock);
2233
2234                 /* Step 1.5: remove snmp6 entry */
2235                 snmp6_unregister_dev(idev);
2236
2237         }
2238
2239         /* Step 2: clear hash table */
2240         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2241                 bifa = &inet6_addr_lst[i];
2242
2243                 write_lock_bh(&addrconf_hash_lock);
2244                 while ((ifa = *bifa) != NULL) {
2245                         if (ifa->idev == idev) {
2246                                 *bifa = ifa->lst_next;
2247                                 ifa->lst_next = NULL;
2248                                 addrconf_del_timer(ifa);
2249                                 in6_ifa_put(ifa);
2250                                 continue;
2251                         }
2252                         bifa = &ifa->lst_next;
2253                 }
2254                 write_unlock_bh(&addrconf_hash_lock);
2255         }
2256
2257         write_lock_bh(&idev->lock);
2258
2259         /* Step 3: clear flags for stateless addrconf */
2260         if (how != 1)
2261                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2262
2263         /* Step 4: clear address list */
2264 #ifdef CONFIG_IPV6_PRIVACY
2265         if (how == 1 && del_timer(&idev->regen_timer))
2266                 in6_dev_put(idev);
2267
2268         /* clear tempaddr list */
2269         while ((ifa = idev->tempaddr_list) != NULL) {
2270                 idev->tempaddr_list = ifa->tmp_next;
2271                 ifa->tmp_next = NULL;
2272                 ifa->dead = 1;
2273                 write_unlock_bh(&idev->lock);
2274                 spin_lock_bh(&ifa->lock);
2275
2276                 if (ifa->ifpub) {
2277                         in6_ifa_put(ifa->ifpub);
2278                         ifa->ifpub = NULL;
2279                 }
2280                 spin_unlock_bh(&ifa->lock);
2281                 in6_ifa_put(ifa);
2282                 write_lock_bh(&idev->lock);
2283         }
2284 #endif
2285         while ((ifa = idev->addr_list) != NULL) {
2286                 idev->addr_list = ifa->if_next;
2287                 ifa->if_next = NULL;
2288                 ifa->dead = 1;
2289                 addrconf_del_timer(ifa);
2290                 write_unlock_bh(&idev->lock);
2291
2292                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2293                 in6_ifa_put(ifa);
2294
2295                 write_lock_bh(&idev->lock);
2296         }
2297         write_unlock_bh(&idev->lock);
2298
2299         /* Step 5: Discard multicast list */
2300
2301         if (how == 1)
2302                 ipv6_mc_destroy_dev(idev);
2303         else
2304                 ipv6_mc_down(idev);
2305
2306         /* Step 5: netlink notification of this interface */
2307         idev->tstamp = jiffies;
2308         inet6_ifinfo_notify(RTM_DELLINK, idev);
2309
2310         /* Shot the device (if unregistered) */
2311
2312         if (how == 1) {
2313 #ifdef CONFIG_SYSCTL
2314                 addrconf_sysctl_unregister(&idev->cnf);
2315                 neigh_sysctl_unregister(idev->nd_parms);
2316 #endif
2317                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2318                 neigh_ifdown(&nd_tbl, dev);
2319                 in6_dev_put(idev);
2320         }
2321         return 0;
2322 }
2323
2324 static void addrconf_rs_timer(unsigned long data)
2325 {
2326         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2327
2328         if (ifp->idev->cnf.forwarding)
2329                 goto out;
2330
2331         if (ifp->idev->if_flags & IF_RA_RCVD) {
2332                 /*
2333                  *      Announcement received after solicitation
2334                  *      was sent
2335                  */
2336                 goto out;
2337         }
2338
2339         spin_lock(&ifp->lock);
2340         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2341                 struct in6_addr all_routers;
2342
2343                 /* The wait after the last probe can be shorter */
2344                 addrconf_mod_timer(ifp, AC_RS,
2345                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2346                                    ifp->idev->cnf.rtr_solicit_delay :
2347                                    ifp->idev->cnf.rtr_solicit_interval);
2348                 spin_unlock(&ifp->lock);
2349
2350                 ipv6_addr_all_routers(&all_routers);
2351
2352                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2353         } else {
2354                 spin_unlock(&ifp->lock);
2355                 /*
2356                  * Note: we do not support deprecated "all on-link"
2357                  * assumption any longer.
2358                  */
2359                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2360                        ifp->idev->dev->name);
2361         }
2362
2363 out:
2364         in6_ifa_put(ifp);
2365 }
2366
2367 /*
2368  *      Duplicate Address Detection
2369  */
2370 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2371 {
2372         struct inet6_dev *idev = ifp->idev;
2373         struct net_device *dev = idev->dev;
2374         unsigned long rand_num;
2375
2376         addrconf_join_solict(dev, &ifp->addr);
2377
2378         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2379                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2380                                         flags);
2381
2382         net_srandom(ifp->addr.s6_addr32[3]);
2383         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2384
2385         read_lock_bh(&idev->lock);
2386         if (ifp->dead)
2387                 goto out;
2388         spin_lock_bh(&ifp->lock);
2389
2390         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2391             !(ifp->flags&IFA_F_TENTATIVE)) {
2392                 ifp->flags &= ~IFA_F_TENTATIVE;
2393                 spin_unlock_bh(&ifp->lock);
2394                 read_unlock_bh(&idev->lock);
2395
2396                 addrconf_dad_completed(ifp);
2397                 return;
2398         }
2399
2400         ifp->probes = idev->cnf.dad_transmits;
2401         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2402
2403         spin_unlock_bh(&ifp->lock);
2404 out:
2405         read_unlock_bh(&idev->lock);
2406 }
2407
2408 static void addrconf_dad_timer(unsigned long data)
2409 {
2410         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2411         struct inet6_dev *idev = ifp->idev;
2412         struct in6_addr unspec;
2413         struct in6_addr mcaddr;
2414
2415         read_lock_bh(&idev->lock);
2416         if (idev->dead) {
2417                 read_unlock_bh(&idev->lock);
2418                 goto out;
2419         }
2420         spin_lock_bh(&ifp->lock);
2421         if (ifp->probes == 0) {
2422                 /*
2423                  * DAD was successful
2424                  */
2425
2426                 ifp->flags &= ~IFA_F_TENTATIVE;
2427                 spin_unlock_bh(&ifp->lock);
2428                 read_unlock_bh(&idev->lock);
2429
2430                 addrconf_dad_completed(ifp);
2431
2432                 goto out;
2433         }
2434
2435         ifp->probes--;
2436         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2437         spin_unlock_bh(&ifp->lock);
2438         read_unlock_bh(&idev->lock);
2439
2440         /* send a neighbour solicitation for our addr */
2441         memset(&unspec, 0, sizeof(unspec));
2442         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2443         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2444 out:
2445         in6_ifa_put(ifp);
2446 }
2447
2448 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2449 {
2450         struct net_device *     dev = ifp->idev->dev;
2451
2452         /*
2453          *      Configure the address for reception. Now it is valid.
2454          */
2455
2456         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2457
2458         /* If added prefix is link local and forwarding is off,
2459            start sending router solicitations.
2460          */
2461
2462         if (ifp->idev->cnf.forwarding == 0 &&
2463             ifp->idev->cnf.rtr_solicits > 0 &&
2464             (dev->flags&IFF_LOOPBACK) == 0 &&
2465             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2466                 struct in6_addr all_routers;
2467
2468                 ipv6_addr_all_routers(&all_routers);
2469
2470                 /*
2471                  *      If a host as already performed a random delay
2472                  *      [...] as part of DAD [...] there is no need
2473                  *      to delay again before sending the first RS
2474                  */
2475                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2476
2477                 spin_lock_bh(&ifp->lock);
2478                 ifp->probes = 1;
2479                 ifp->idev->if_flags |= IF_RS_SENT;
2480                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2481                 spin_unlock_bh(&ifp->lock);
2482         }
2483 }
2484
2485 #ifdef CONFIG_PROC_FS
2486 struct if6_iter_state {
2487         int bucket;
2488 };
2489
2490 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2491 {
2492         struct inet6_ifaddr *ifa = NULL;
2493         struct if6_iter_state *state = seq->private;
2494
2495         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2496                 ifa = inet6_addr_lst[state->bucket];
2497                 if (ifa)
2498                         break;
2499         }
2500         return ifa;
2501 }
2502
2503 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2504 {
2505         struct if6_iter_state *state = seq->private;
2506
2507         ifa = ifa->lst_next;
2508 try_again:
2509         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2510                 ifa = inet6_addr_lst[state->bucket];
2511                 goto try_again;
2512         }
2513         return ifa;
2514 }
2515
2516 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2517 {
2518         struct inet6_ifaddr *ifa = if6_get_first(seq);
2519
2520         if (ifa)
2521                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2522                         --pos;
2523         return pos ? NULL : ifa;
2524 }
2525
2526 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2527 {
2528         read_lock_bh(&addrconf_hash_lock);
2529         return if6_get_idx(seq, *pos);
2530 }
2531
2532 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2533 {
2534         struct inet6_ifaddr *ifa;
2535
2536         ifa = if6_get_next(seq, v);
2537         ++*pos;
2538         return ifa;
2539 }
2540
2541 static void if6_seq_stop(struct seq_file *seq, void *v)
2542 {
2543         read_unlock_bh(&addrconf_hash_lock);
2544 }
2545
2546 static int if6_seq_show(struct seq_file *seq, void *v)
2547 {
2548         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2549         seq_printf(seq,
2550                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2551                    NIP6(ifp->addr),
2552                    ifp->idev->dev->ifindex,
2553                    ifp->prefix_len,
2554                    ifp->scope,
2555                    ifp->flags,
2556                    ifp->idev->dev->name);
2557         return 0;
2558 }
2559
2560 static struct seq_operations if6_seq_ops = {
2561         .start  = if6_seq_start,
2562         .next   = if6_seq_next,
2563         .show   = if6_seq_show,
2564         .stop   = if6_seq_stop,
2565 };
2566
2567 static int if6_seq_open(struct inode *inode, struct file *file)
2568 {
2569         struct seq_file *seq;
2570         int rc = -ENOMEM;
2571         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2572
2573         if (!s)
2574                 goto out;
2575         memset(s, 0, sizeof(*s));
2576
2577         rc = seq_open(file, &if6_seq_ops);
2578         if (rc)
2579                 goto out_kfree;
2580
2581         seq = file->private_data;
2582         seq->private = s;
2583 out:
2584         return rc;
2585 out_kfree:
2586         kfree(s);
2587         goto out;
2588 }
2589
2590 static struct file_operations if6_fops = {
2591         .owner          = THIS_MODULE,
2592         .open           = if6_seq_open,
2593         .read           = seq_read,
2594         .llseek         = seq_lseek,
2595         .release        = seq_release_private,
2596 };
2597
2598 int __init if6_proc_init(void)
2599 {
2600         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2601                 return -ENOMEM;
2602         return 0;
2603 }
2604
2605 void if6_proc_exit(void)
2606 {
2607         proc_net_remove("if_inet6");
2608 }
2609 #endif  /* CONFIG_PROC_FS */
2610
2611 /*
2612  *      Periodic address status verification
2613  */
2614
2615 static void addrconf_verify(unsigned long foo)
2616 {
2617         struct inet6_ifaddr *ifp;
2618         unsigned long now, next;
2619         int i;
2620
2621         spin_lock_bh(&addrconf_verify_lock);
2622         now = jiffies;
2623         next = now + ADDR_CHECK_FREQUENCY;
2624
2625         del_timer(&addr_chk_timer);
2626
2627         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2628
2629 restart:
2630                 write_lock(&addrconf_hash_lock);
2631                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2632                         unsigned long age;
2633 #ifdef CONFIG_IPV6_PRIVACY
2634                         unsigned long regen_advance;
2635 #endif
2636
2637                         if (ifp->flags & IFA_F_PERMANENT)
2638                                 continue;
2639
2640                         spin_lock(&ifp->lock);
2641                         age = (now - ifp->tstamp) / HZ;
2642
2643 #ifdef CONFIG_IPV6_PRIVACY
2644                         regen_advance = ifp->idev->cnf.regen_max_retry *
2645                                         ifp->idev->cnf.dad_transmits *
2646                                         ifp->idev->nd_parms->retrans_time / HZ;
2647 #endif
2648
2649                         if (age >= ifp->valid_lft) {
2650                                 spin_unlock(&ifp->lock);
2651                                 in6_ifa_hold(ifp);
2652                                 write_unlock(&addrconf_hash_lock);
2653                                 ipv6_del_addr(ifp);
2654                                 goto restart;
2655                         } else if (age >= ifp->prefered_lft) {
2656                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2657                                 int deprecate = 0;
2658
2659                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2660                                         deprecate = 1;
2661                                         ifp->flags |= IFA_F_DEPRECATED;
2662                                 }
2663
2664                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2665                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2666
2667                                 spin_unlock(&ifp->lock);
2668
2669                                 if (deprecate) {
2670                                         in6_ifa_hold(ifp);
2671                                         write_unlock(&addrconf_hash_lock);
2672
2673                                         ipv6_ifa_notify(0, ifp);
2674                                         in6_ifa_put(ifp);
2675                                         goto restart;
2676                                 }
2677 #ifdef CONFIG_IPV6_PRIVACY
2678                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2679                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2680                                 if (age >= ifp->prefered_lft - regen_advance) {
2681                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2682                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2683                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2684                                         if (!ifp->regen_count && ifpub) {
2685                                                 ifp->regen_count++;
2686                                                 in6_ifa_hold(ifp);
2687                                                 in6_ifa_hold(ifpub);
2688                                                 spin_unlock(&ifp->lock);
2689                                                 write_unlock(&addrconf_hash_lock);
2690                                                 ipv6_create_tempaddr(ifpub, ifp);
2691                                                 in6_ifa_put(ifpub);
2692                                                 in6_ifa_put(ifp);
2693                                                 goto restart;
2694                                         }
2695                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2696                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2697                                 spin_unlock(&ifp->lock);
2698 #endif
2699                         } else {
2700                                 /* ifp->prefered_lft <= ifp->valid_lft */
2701                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2702                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2703                                 spin_unlock(&ifp->lock);
2704                         }
2705                 }
2706                 write_unlock(&addrconf_hash_lock);
2707         }
2708
2709         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2710         add_timer(&addr_chk_timer);
2711         spin_unlock_bh(&addrconf_verify_lock);
2712 }
2713
2714 static int
2715 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2716 {
2717         struct rtattr **rta = arg;
2718         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2719         struct in6_addr *pfx;
2720
2721         pfx = NULL;
2722         if (rta[IFA_ADDRESS-1]) {
2723                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2724                         return -EINVAL;
2725                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2726         }
2727         if (rta[IFA_LOCAL-1]) {
2728                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2729                         return -EINVAL;
2730                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2731         }
2732         if (pfx == NULL)
2733                 return -EINVAL;
2734
2735         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2736 }
2737
2738 static int
2739 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2740 {
2741         struct rtattr  **rta = arg;
2742         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2743         struct in6_addr *pfx;
2744
2745         pfx = NULL;
2746         if (rta[IFA_ADDRESS-1]) {
2747                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2748                         return -EINVAL;
2749                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2750         }
2751         if (rta[IFA_LOCAL-1]) {
2752                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2753                         return -EINVAL;
2754                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2755         }
2756         if (pfx == NULL)
2757                 return -EINVAL;
2758
2759         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2760 }
2761
2762 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2763                              u32 pid, u32 seq, int event, unsigned int flags)
2764 {
2765         struct ifaddrmsg *ifm;
2766         struct nlmsghdr  *nlh;
2767         struct ifa_cacheinfo ci;
2768         unsigned char    *b = skb->tail;
2769
2770         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2771         ifm = NLMSG_DATA(nlh);
2772         ifm->ifa_family = AF_INET6;
2773         ifm->ifa_prefixlen = ifa->prefix_len;
2774         ifm->ifa_flags = ifa->flags;
2775         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2776         if (ifa->scope&IFA_HOST)
2777                 ifm->ifa_scope = RT_SCOPE_HOST;
2778         else if (ifa->scope&IFA_LINK)
2779                 ifm->ifa_scope = RT_SCOPE_LINK;
2780         else if (ifa->scope&IFA_SITE)
2781                 ifm->ifa_scope = RT_SCOPE_SITE;
2782         ifm->ifa_index = ifa->idev->dev->ifindex;
2783         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2784         if (!(ifa->flags&IFA_F_PERMANENT)) {
2785                 ci.ifa_prefered = ifa->prefered_lft;
2786                 ci.ifa_valid = ifa->valid_lft;
2787                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2788                         long tval = (jiffies - ifa->tstamp)/HZ;
2789                         ci.ifa_prefered -= tval;
2790                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2791                                 ci.ifa_valid -= tval;
2792                 }
2793         } else {
2794                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2795                 ci.ifa_valid = INFINITY_LIFE_TIME;
2796         }
2797         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2798                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2799         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2800                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2801         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2802         nlh->nlmsg_len = skb->tail - b;
2803         return skb->len;
2804
2805 nlmsg_failure:
2806 rtattr_failure:
2807         skb_trim(skb, b - skb->data);
2808         return -1;
2809 }
2810
2811 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2812                                 u32 pid, u32 seq, int event, u16 flags)
2813 {
2814         struct ifaddrmsg *ifm;
2815         struct nlmsghdr  *nlh;
2816         struct ifa_cacheinfo ci;
2817         unsigned char    *b = skb->tail;
2818
2819         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2820         ifm = NLMSG_DATA(nlh);
2821         ifm->ifa_family = AF_INET6;
2822         ifm->ifa_prefixlen = 128;
2823         ifm->ifa_flags = IFA_F_PERMANENT;
2824         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2825         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2826                 ifm->ifa_scope = RT_SCOPE_SITE;
2827         ifm->ifa_index = ifmca->idev->dev->ifindex;
2828         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2829         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2830                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2831                     * 100 / HZ);
2832         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2833                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2834                     * 100 / HZ);
2835         ci.ifa_prefered = INFINITY_LIFE_TIME;
2836         ci.ifa_valid = INFINITY_LIFE_TIME;
2837         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2838         nlh->nlmsg_len = skb->tail - b;
2839         return skb->len;
2840
2841 nlmsg_failure:
2842 rtattr_failure:
2843         skb_trim(skb, b - skb->data);
2844         return -1;
2845 }
2846
2847 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2848                                 u32 pid, u32 seq, int event, unsigned int flags)
2849 {
2850         struct ifaddrmsg *ifm;
2851         struct nlmsghdr  *nlh;
2852         struct ifa_cacheinfo ci;
2853         unsigned char    *b = skb->tail;
2854
2855         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2856         ifm = NLMSG_DATA(nlh);
2857         ifm->ifa_family = AF_INET6;
2858         ifm->ifa_prefixlen = 128;
2859         ifm->ifa_flags = IFA_F_PERMANENT;
2860         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2861         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2862                 ifm->ifa_scope = RT_SCOPE_SITE;
2863         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2864         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2865         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2866                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2867                     * 100 / HZ);
2868         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2869                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2870                     * 100 / HZ);
2871         ci.ifa_prefered = INFINITY_LIFE_TIME;
2872         ci.ifa_valid = INFINITY_LIFE_TIME;
2873         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2874         nlh->nlmsg_len = skb->tail - b;
2875         return skb->len;
2876
2877 nlmsg_failure:
2878 rtattr_failure:
2879         skb_trim(skb, b - skb->data);
2880         return -1;
2881 }
2882
2883 enum addr_type_t
2884 {
2885         UNICAST_ADDR,
2886         MULTICAST_ADDR,
2887         ANYCAST_ADDR,
2888 };
2889
2890 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2891                            enum addr_type_t type)
2892 {
2893         int idx, ip_idx;
2894         int s_idx, s_ip_idx;
2895         int err = 1;
2896         struct net_device *dev;
2897         struct inet6_dev *idev = NULL;
2898         struct inet6_ifaddr *ifa;
2899         struct ifmcaddr6 *ifmca;
2900         struct ifacaddr6 *ifaca;
2901
2902         s_idx = cb->args[0];
2903         s_ip_idx = ip_idx = cb->args[1];
2904         read_lock(&dev_base_lock);
2905
2906         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2907                 if (idx < s_idx)
2908                         continue;
2909                 if (idx > s_idx)
2910                         s_ip_idx = 0;
2911                 ip_idx = 0;
2912                 if ((idev = in6_dev_get(dev)) == NULL)
2913                         continue;
2914                 read_lock_bh(&idev->lock);
2915                 switch (type) {
2916                 case UNICAST_ADDR:
2917                         /* unicast address incl. temp addr */
2918                         for (ifa = idev->addr_list; ifa;
2919                              ifa = ifa->if_next, ip_idx++) {
2920                                 if (ip_idx < s_ip_idx)
2921                                         continue;
2922                                 if ((err = inet6_fill_ifaddr(skb, ifa,
2923                                     NETLINK_CB(cb->skb).pid,
2924                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
2925                                     NLM_F_MULTI)) <= 0)
2926                                         goto done;
2927                         }
2928                         break;
2929                 case MULTICAST_ADDR:
2930                         /* multicast address */
2931                         for (ifmca = idev->mc_list; ifmca;
2932                              ifmca = ifmca->next, ip_idx++) {
2933                                 if (ip_idx < s_ip_idx)
2934                                         continue;
2935                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2936                                     NETLINK_CB(cb->skb).pid,
2937                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2938                                     NLM_F_MULTI)) <= 0)
2939                                         goto done;
2940                         }
2941                         break;
2942                 case ANYCAST_ADDR:
2943                         /* anycast address */
2944                         for (ifaca = idev->ac_list; ifaca;
2945                              ifaca = ifaca->aca_next, ip_idx++) {
2946                                 if (ip_idx < s_ip_idx)
2947                                         continue;
2948                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2949                                     NETLINK_CB(cb->skb).pid,
2950                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2951                                     NLM_F_MULTI)) <= 0)
2952                                         goto done;
2953                         }
2954                         break;
2955                 default:
2956                         break;
2957                 }
2958                 read_unlock_bh(&idev->lock);
2959                 in6_dev_put(idev);
2960         }
2961 done:
2962         if (err <= 0) {
2963                 read_unlock_bh(&idev->lock);
2964                 in6_dev_put(idev);
2965         }
2966         read_unlock(&dev_base_lock);
2967         cb->args[0] = idx;
2968         cb->args[1] = ip_idx;
2969         return skb->len;
2970 }
2971
2972 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2973 {
2974         enum addr_type_t type = UNICAST_ADDR;
2975         return inet6_dump_addr(skb, cb, type);
2976 }
2977
2978 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2979 {
2980         enum addr_type_t type = MULTICAST_ADDR;
2981         return inet6_dump_addr(skb, cb, type);
2982 }
2983
2984
2985 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2986 {
2987         enum addr_type_t type = ANYCAST_ADDR;
2988         return inet6_dump_addr(skb, cb, type);
2989 }
2990
2991 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2992 {
2993         struct sk_buff *skb;
2994         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2995
2996         skb = alloc_skb(size, GFP_ATOMIC);
2997         if (!skb) {
2998                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
2999                 return;
3000         }
3001         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3002                 kfree_skb(skb);
3003                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3004                 return;
3005         }
3006         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3007         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3008 }
3009
3010 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3011                                 __s32 *array, int bytes)
3012 {
3013         memset(array, 0, bytes);
3014         array[DEVCONF_FORWARDING] = cnf->forwarding;
3015         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3016         array[DEVCONF_MTU6] = cnf->mtu6;
3017         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3018         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3019         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3020         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3021         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3022         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3023         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3024         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3025 #ifdef CONFIG_IPV6_PRIVACY
3026         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3027         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3028         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3029         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3030         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3031 #endif
3032         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3033 }
3034
3035 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3036                              u32 pid, u32 seq, int event, unsigned int flags)
3037 {
3038         struct net_device       *dev = idev->dev;
3039         __s32                   *array = NULL;
3040         struct ifinfomsg        *r;
3041         struct nlmsghdr         *nlh;
3042         unsigned char           *b = skb->tail;
3043         struct rtattr           *subattr;
3044         __u32                   mtu = dev->mtu;
3045         struct ifla_cacheinfo   ci;
3046
3047         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3048         r = NLMSG_DATA(nlh);
3049         r->ifi_family = AF_INET6;
3050         r->__ifi_pad = 0;
3051         r->ifi_type = dev->type;
3052         r->ifi_index = dev->ifindex;
3053         r->ifi_flags = dev_get_flags(dev);
3054         r->ifi_change = 0;
3055
3056         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3057
3058         if (dev->addr_len)
3059                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3060
3061         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3062         if (dev->ifindex != dev->iflink)
3063                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3064
3065         subattr = (struct rtattr*)skb->tail;
3066
3067         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3068
3069         /* return the device flags */
3070         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3071
3072         /* return interface cacheinfo */
3073         ci.max_reasm_len = IPV6_MAXPLEN;
3074         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3075                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3076         ci.reachable_time = idev->nd_parms->reachable_time;
3077         ci.retrans_time = idev->nd_parms->retrans_time;
3078         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3079
3080         /* return the device sysctl params */
3081         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3082                 goto rtattr_failure;
3083         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3084         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3085
3086         /* XXX - Statistics/MC not implemented */
3087         subattr->rta_len = skb->tail - (u8*)subattr;
3088
3089         nlh->nlmsg_len = skb->tail - b;
3090         kfree(array);
3091         return skb->len;
3092
3093 nlmsg_failure:
3094 rtattr_failure:
3095         kfree(array);
3096         skb_trim(skb, b - skb->data);
3097         return -1;
3098 }
3099
3100 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3101 {
3102         int idx, err;
3103         int s_idx = cb->args[0];
3104         struct net_device *dev;
3105         struct inet6_dev *idev;
3106
3107         read_lock(&dev_base_lock);
3108         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3109                 if (idx < s_idx)
3110                         continue;
3111                 if ((idev = in6_dev_get(dev)) == NULL)
3112                         continue;
3113                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3114                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3115                 in6_dev_put(idev);
3116                 if (err <= 0)
3117                         break;
3118         }
3119         read_unlock(&dev_base_lock);
3120         cb->args[0] = idx;
3121
3122         return skb->len;
3123 }
3124
3125 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3126 {
3127         struct sk_buff *skb;
3128         /* 128 bytes ?? */
3129         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3130
3131         skb = alloc_skb(size, GFP_ATOMIC);
3132         if (!skb) {
3133                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3134                 return;
3135         }
3136         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3137                 kfree_skb(skb);
3138                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3139                 return;
3140         }
3141         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3142         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3143 }
3144
3145 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3146                         struct prefix_info *pinfo, u32 pid, u32 seq,
3147                         int event, unsigned int flags)
3148 {
3149         struct prefixmsg        *pmsg;
3150         struct nlmsghdr         *nlh;
3151         unsigned char           *b = skb->tail;
3152         struct prefix_cacheinfo ci;
3153
3154         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3155         pmsg = NLMSG_DATA(nlh);
3156         pmsg->prefix_family = AF_INET6;
3157         pmsg->prefix_pad1 = 0;
3158         pmsg->prefix_pad2 = 0;
3159         pmsg->prefix_ifindex = idev->dev->ifindex;
3160         pmsg->prefix_len = pinfo->prefix_len;
3161         pmsg->prefix_type = pinfo->type;
3162         pmsg->prefix_pad3 = 0;
3163
3164         pmsg->prefix_flags = 0;
3165         if (pinfo->onlink)
3166                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3167         if (pinfo->autoconf)
3168                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3169
3170         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3171
3172         ci.preferred_time = ntohl(pinfo->prefered);
3173         ci.valid_time = ntohl(pinfo->valid);
3174         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3175
3176         nlh->nlmsg_len = skb->tail - b;
3177         return skb->len;
3178
3179 nlmsg_failure:
3180 rtattr_failure:
3181         skb_trim(skb, b - skb->data);
3182         return -1;
3183 }
3184
3185 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3186                          struct prefix_info *pinfo)
3187 {
3188         struct sk_buff *skb;
3189         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3190
3191         skb = alloc_skb(size, GFP_ATOMIC);
3192         if (!skb) {
3193                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3194                 return;
3195         }
3196         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3197                 kfree_skb(skb);
3198                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3199                 return;
3200         }
3201         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3202         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3203 }
3204
3205 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3206         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3207         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3208         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3209         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3210         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3211         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3212         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3213         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3214         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3215                                       .dumpit   = inet6_dump_fib, },
3216 };
3217
3218 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3219 {
3220         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3221
3222         switch (event) {
3223         case RTM_NEWADDR:
3224                 dst_hold(&ifp->rt->u.dst);
3225                 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3226                         dst_release(&ifp->rt->u.dst);
3227                 if (ifp->idev->cnf.forwarding)
3228                         addrconf_join_anycast(ifp);
3229                 break;
3230         case RTM_DELADDR:
3231                 if (ifp->idev->cnf.forwarding)
3232                         addrconf_leave_anycast(ifp);
3233                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3234                 dst_hold(&ifp->rt->u.dst);
3235                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3236                         dst_free(&ifp->rt->u.dst);
3237                 else
3238                         dst_release(&ifp->rt->u.dst);
3239                 break;
3240         }
3241 }
3242
3243 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3244 {
3245         read_lock_bh(&addrconf_lock);
3246         if (likely(ifp->idev->dead == 0))
3247                 __ipv6_ifa_notify(event, ifp);
3248         read_unlock_bh(&addrconf_lock);
3249 }
3250
3251 #ifdef CONFIG_SYSCTL
3252
3253 static
3254 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3255                            void __user *buffer, size_t *lenp, loff_t *ppos)
3256 {
3257         int *valp = ctl->data;
3258         int val = *valp;
3259         int ret;
3260
3261         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3262
3263         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3264                 if (valp != &ipv6_devconf.forwarding) {
3265                         if ((!*valp) ^ (!val)) {
3266                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3267                                 if (idev == NULL)
3268                                         return ret;
3269                                 dev_forward_change(idev);
3270                         }
3271                 } else {
3272                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3273                         addrconf_forward_change();
3274                 }
3275                 if (*valp)
3276                         rt6_purge_dflt_routers();
3277         }
3278
3279         return ret;
3280 }
3281
3282 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3283                                             int __user *name, int nlen,
3284                                             void __user *oldval,
3285                                             size_t __user *oldlenp,
3286                                             void __user *newval, size_t newlen,
3287                                             void **context)
3288 {
3289         int *valp = table->data;
3290         int new;
3291
3292         if (!newval || !newlen)
3293                 return 0;
3294         if (newlen != sizeof(int))
3295                 return -EINVAL;
3296         if (get_user(new, (int __user *)newval))
3297                 return -EFAULT;
3298         if (new == *valp)
3299                 return 0;
3300         if (oldval && oldlenp) {
3301                 size_t len;
3302                 if (get_user(len, oldlenp))
3303                         return -EFAULT;
3304                 if (len) {
3305                         if (len > table->maxlen)
3306                                 len = table->maxlen;
3307                         if (copy_to_user(oldval, valp, len))
3308                                 return -EFAULT;
3309                         if (put_user(len, oldlenp))
3310                                 return -EFAULT;
3311                 }
3312         }
3313
3314         if (valp != &ipv6_devconf_dflt.forwarding) {
3315                 if (valp != &ipv6_devconf.forwarding) {
3316                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3317                         int changed;
3318                         if (unlikely(idev == NULL))
3319                                 return -ENODEV;
3320                         changed = (!*valp) ^ (!new);
3321                         *valp = new;
3322                         if (changed)
3323                                 dev_forward_change(idev);
3324                 } else {
3325                         *valp = new;
3326                         addrconf_forward_change();
3327                 }
3328
3329                 if (*valp)
3330                         rt6_purge_dflt_routers();
3331         } else
3332                 *valp = new;
3333
3334         return 1;
3335 }
3336
3337 static struct addrconf_sysctl_table
3338 {
3339         struct ctl_table_header *sysctl_header;
3340         ctl_table addrconf_vars[__NET_IPV6_MAX];
3341         ctl_table addrconf_dev[2];
3342         ctl_table addrconf_conf_dir[2];
3343         ctl_table addrconf_proto_dir[2];
3344         ctl_table addrconf_root_dir[2];
3345 } addrconf_sysctl = {
3346         .sysctl_header = NULL,
3347         .addrconf_vars = {
3348                 {
3349                         .ctl_name       =       NET_IPV6_FORWARDING,
3350                         .procname       =       "forwarding",
3351                         .data           =       &ipv6_devconf.forwarding,
3352                         .maxlen         =       sizeof(int),
3353                         .mode           =       0644,
3354                         .proc_handler   =       &addrconf_sysctl_forward,
3355                         .strategy       =       &addrconf_sysctl_forward_strategy,
3356                 },
3357                 {
3358                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3359                         .procname       =       "hop_limit",
3360                         .data           =       &ipv6_devconf.hop_limit,
3361                         .maxlen         =       sizeof(int),
3362                         .mode           =       0644,
3363                         .proc_handler   =       proc_dointvec,
3364                 },
3365                 {
3366                         .ctl_name       =       NET_IPV6_MTU,
3367                         .procname       =       "mtu",
3368                         .data           =       &ipv6_devconf.mtu6,
3369                         .maxlen         =       sizeof(int),
3370                         .mode           =       0644,
3371                         .proc_handler   =       &proc_dointvec,
3372                 },
3373                 {
3374                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3375                         .procname       =       "accept_ra",
3376                         .data           =       &ipv6_devconf.accept_ra,
3377                         .maxlen         =       sizeof(int),
3378                         .mode           =       0644,
3379                         .proc_handler   =       &proc_dointvec,
3380                 },
3381                 {
3382                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3383                         .procname       =       "accept_redirects",
3384                         .data           =       &ipv6_devconf.accept_redirects,
3385                         .maxlen         =       sizeof(int),
3386                         .mode           =       0644,
3387                         .proc_handler   =       &proc_dointvec,
3388                 },
3389                 {
3390                         .ctl_name       =       NET_IPV6_AUTOCONF,
3391                         .procname       =       "autoconf",
3392                         .data           =       &ipv6_devconf.autoconf,
3393                         .maxlen         =       sizeof(int),
3394                         .mode           =       0644,
3395                         .proc_handler   =       &proc_dointvec,
3396                 },
3397                 {
3398                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3399                         .procname       =       "dad_transmits",
3400                         .data           =       &ipv6_devconf.dad_transmits,
3401                         .maxlen         =       sizeof(int),
3402                         .mode           =       0644,
3403                         .proc_handler   =       &proc_dointvec,
3404                 },
3405                 {
3406                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3407                         .procname       =       "router_solicitations",
3408                         .data           =       &ipv6_devconf.rtr_solicits,
3409                         .maxlen         =       sizeof(int),
3410                         .mode           =       0644,
3411                         .proc_handler   =       &proc_dointvec,
3412                 },
3413                 {
3414                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3415                         .procname       =       "router_solicitation_interval",
3416                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3417                         .maxlen         =       sizeof(int),
3418                         .mode           =       0644,
3419                         .proc_handler   =       &proc_dointvec_jiffies,
3420                         .strategy       =       &sysctl_jiffies,
3421                 },
3422                 {
3423                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3424                         .procname       =       "router_solicitation_delay",
3425                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3426                         .maxlen         =       sizeof(int),
3427                         .mode           =       0644,
3428                         .proc_handler   =       &proc_dointvec_jiffies,
3429                         .strategy       =       &sysctl_jiffies,
3430                 },
3431                 {
3432                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3433                         .procname       =       "force_mld_version",
3434                         .data           =       &ipv6_devconf.force_mld_version,
3435                         .maxlen         =       sizeof(int),
3436                         .mode           =       0644,
3437                         .proc_handler   =       &proc_dointvec,
3438                 },
3439 #ifdef CONFIG_IPV6_PRIVACY
3440                 {
3441                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3442                         .procname       =       "use_tempaddr",
3443                         .data           =       &ipv6_devconf.use_tempaddr,
3444                         .maxlen         =       sizeof(int),
3445                         .mode           =       0644,
3446                         .proc_handler   =       &proc_dointvec,
3447                 },
3448                 {
3449                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3450                         .procname       =       "temp_valid_lft",
3451                         .data           =       &ipv6_devconf.temp_valid_lft,
3452                         .maxlen         =       sizeof(int),
3453                         .mode           =       0644,
3454                         .proc_handler   =       &proc_dointvec,
3455                 },
3456                 {
3457                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3458                         .procname       =       "temp_prefered_lft",
3459                         .data           =       &ipv6_devconf.temp_prefered_lft,
3460                         .maxlen         =       sizeof(int),
3461                         .mode           =       0644,
3462                         .proc_handler   =       &proc_dointvec,
3463                 },
3464                 {
3465                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3466                         .procname       =       "regen_max_retry",
3467                         .data           =       &ipv6_devconf.regen_max_retry,
3468                         .maxlen         =       sizeof(int),
3469                         .mode           =       0644,
3470                         .proc_handler   =       &proc_dointvec,
3471                 },
3472                 {
3473                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3474                         .procname       =       "max_desync_factor",
3475                         .data           =       &ipv6_devconf.max_desync_factor,
3476                         .maxlen         =       sizeof(int),
3477                         .mode           =       0644,
3478                         .proc_handler   =       &proc_dointvec,
3479                 },
3480 #endif
3481                 {
3482                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3483                         .procname       =       "max_addresses",
3484                         .data           =       &ipv6_devconf.max_addresses,
3485                         .maxlen         =       sizeof(int),
3486                         .mode           =       0644,
3487                         .proc_handler   =       &proc_dointvec,
3488                 },
3489                 {
3490                         .ctl_name       =       0,      /* sentinel */
3491                 }
3492         },
3493         .addrconf_dev = {
3494                 {
3495                         .ctl_name       =       NET_PROTO_CONF_ALL,
3496                         .procname       =       "all",
3497                         .mode           =       0555,
3498                         .child          =       addrconf_sysctl.addrconf_vars,
3499                 },
3500                 {
3501                         .ctl_name       =       0,      /* sentinel */
3502                 }
3503         },
3504         .addrconf_conf_dir = {
3505                 {
3506                         .ctl_name       =       NET_IPV6_CONF,
3507                         .procname       =       "conf",
3508                         .mode           =       0555,
3509                         .child          =       addrconf_sysctl.addrconf_dev,
3510                 },
3511                 {
3512                         .ctl_name       =       0,      /* sentinel */
3513                 }
3514         },
3515         .addrconf_proto_dir = {
3516                 {
3517                         .ctl_name       =       NET_IPV6,
3518                         .procname       =       "ipv6",
3519                         .mode           =       0555,
3520                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3521                 },
3522                 {
3523                         .ctl_name       =       0,      /* sentinel */
3524                 }
3525         },
3526         .addrconf_root_dir = {
3527                 {
3528                         .ctl_name       =       CTL_NET,
3529                         .procname       =       "net",
3530                         .mode           =       0555,
3531                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3532                 },
3533                 {
3534                         .ctl_name       =       0,      /* sentinel */
3535                 }
3536         },
3537 };
3538
3539 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3540 {
3541         int i;
3542         struct net_device *dev = idev ? idev->dev : NULL;
3543         struct addrconf_sysctl_table *t;
3544         char *dev_name = NULL;
3545
3546         t = kmalloc(sizeof(*t), GFP_KERNEL);
3547         if (t == NULL)
3548                 return;
3549         memcpy(t, &addrconf_sysctl, sizeof(*t));
3550         for (i=0; t->addrconf_vars[i].data; i++) {
3551                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3552                 t->addrconf_vars[i].de = NULL;
3553                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3554         }
3555         if (dev) {
3556                 dev_name = dev->name;
3557                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3558         } else {
3559                 dev_name = "default";
3560                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3561         }
3562
3563         /*
3564          * Make a copy of dev_name, because '.procname' is regarded as const
3565          * by sysctl and we wouldn't want anyone to change it under our feet
3566          * (see SIOCSIFNAME).
3567          */
3568         dev_name = kstrdup(dev_name, GFP_KERNEL);
3569         if (!dev_name)
3570             goto free;
3571
3572         t->addrconf_dev[0].procname = dev_name;
3573
3574         t->addrconf_dev[0].child = t->addrconf_vars;
3575         t->addrconf_dev[0].de = NULL;
3576         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3577         t->addrconf_conf_dir[0].de = NULL;
3578         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3579         t->addrconf_proto_dir[0].de = NULL;
3580         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3581         t->addrconf_root_dir[0].de = NULL;
3582
3583         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3584         if (t->sysctl_header == NULL)
3585                 goto free_procname;
3586         else
3587                 p->sysctl = t;
3588         return;
3589
3590         /* error path */
3591  free_procname:
3592         kfree(dev_name);
3593  free:
3594         kfree(t);
3595
3596         return;
3597 }
3598
3599 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3600 {
3601         if (p->sysctl) {
3602                 struct addrconf_sysctl_table *t = p->sysctl;
3603                 p->sysctl = NULL;
3604                 unregister_sysctl_table(t->sysctl_header);
3605                 kfree(t->addrconf_dev[0].procname);
3606                 kfree(t);
3607         }
3608 }
3609
3610
3611 #endif
3612
3613 /*
3614  *      Device notifier
3615  */
3616
3617 int register_inet6addr_notifier(struct notifier_block *nb)
3618 {
3619         return notifier_chain_register(&inet6addr_chain, nb);
3620 }
3621
3622 int unregister_inet6addr_notifier(struct notifier_block *nb)
3623 {
3624         return notifier_chain_unregister(&inet6addr_chain,nb);
3625 }
3626
3627 /*
3628  *      Init / cleanup code
3629  */
3630
3631 int __init addrconf_init(void)
3632 {
3633         int err = 0;
3634
3635         /* The addrconf netdev notifier requires that loopback_dev
3636          * has it's ipv6 private information allocated and setup
3637          * before it can bring up and give link-local addresses
3638          * to other devices which are up.
3639          *
3640          * Unfortunately, loopback_dev is not necessarily the first
3641          * entry in the global dev_base list of net devices.  In fact,
3642          * it is likely to be the very last entry on that list.
3643          * So this causes the notifier registry below to try and
3644          * give link-local addresses to all devices besides loopback_dev
3645          * first, then loopback_dev, which cases all the non-loopback_dev
3646          * devices to fail to get a link-local address.
3647          *
3648          * So, as a temporary fix, allocate the ipv6 structure for
3649          * loopback_dev first by hand.
3650          * Longer term, all of the dependencies ipv6 has upon the loopback
3651          * device and it being up should be removed.
3652          */
3653         rtnl_lock();
3654         if (!ipv6_add_dev(&loopback_dev))
3655                 err = -ENOMEM;
3656         rtnl_unlock();
3657         if (err)
3658                 return err;
3659
3660         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3661
3662         register_netdevice_notifier(&ipv6_dev_notf);
3663
3664 #ifdef CONFIG_IPV6_PRIVACY
3665         md5_tfm = crypto_alloc_tfm("md5", 0);
3666         if (unlikely(md5_tfm == NULL))
3667                 printk(KERN_WARNING
3668                         "failed to load transform for md5\n");
3669 #endif
3670
3671         addrconf_verify(0);
3672         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3673 #ifdef CONFIG_SYSCTL
3674         addrconf_sysctl.sysctl_header =
3675                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3676         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3677 #endif
3678
3679         return 0;
3680 }
3681
3682 void __exit addrconf_cleanup(void)
3683 {
3684         struct net_device *dev;
3685         struct inet6_dev *idev;
3686         struct inet6_ifaddr *ifa;
3687         int i;
3688
3689         unregister_netdevice_notifier(&ipv6_dev_notf);
3690
3691         rtnetlink_links[PF_INET6] = NULL;
3692 #ifdef CONFIG_SYSCTL
3693         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3694         addrconf_sysctl_unregister(&ipv6_devconf);
3695 #endif
3696
3697         rtnl_lock();
3698
3699         /*
3700          *      clean dev list.
3701          */
3702
3703         for (dev=dev_base; dev; dev=dev->next) {
3704                 if ((idev = __in6_dev_get(dev)) == NULL)
3705                         continue;
3706                 addrconf_ifdown(dev, 1);
3707         }
3708         addrconf_ifdown(&loopback_dev, 2);
3709
3710         /*
3711          *      Check hash table.
3712          */
3713
3714         write_lock_bh(&addrconf_hash_lock);
3715         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3716                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3717                         struct inet6_ifaddr *bifa;
3718
3719                         bifa = ifa;
3720                         ifa = ifa->lst_next;
3721                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3722                         /* Do not free it; something is wrong.
3723                            Now we can investigate it with debugger.
3724                          */
3725                 }
3726         }
3727         write_unlock_bh(&addrconf_hash_lock);
3728
3729         del_timer(&addr_chk_timer);
3730
3731         rtnl_unlock();
3732
3733 #ifdef CONFIG_IPV6_PRIVACY
3734         crypto_free_tfm(md5_tfm);
3735         md5_tfm = NULL;
3736 #endif
3737
3738 #ifdef CONFIG_PROC_FS
3739         proc_net_remove("if_inet6");
3740 #endif
3741 }