net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 /*
  18  *      Changes:
  19  *
  20  *      Janos Farkas                    :       delete timer on ifdown
  21  *      <chexum@bankinf.banki.hu>
  22  *      Andi Kleen                      :       kill double kfree on module
  23  *                                              unload.
  24  *      Maciej W. Rozycki               :       FDDI support
  25  *      sekiya@USAGI                    :       Don't send too many RS
  26  *                                              packets.
  27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  28  *                                              packets.
  29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  30  *                                              address validation timer.
  31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  32  *                                              support.
  33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  34  *                                              address on a same interface.
  35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  37  *                                              seq_file.
  38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  39  *                                              selection; consider scope,
  40  *                                              status etc.
  41  */
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/socket.h>
  46 #include <linux/sockios.h>
  47 #include <linux/net.h>
  48 #include <linux/in6.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/if_addr.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/if_arcnet.h>
  53 #include <linux/if_infiniband.h>
  54 #include <linux/route.h>
  55 #include <linux/inetdevice.h>
  56 #include <linux/init.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64
  65 #include <net/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 <net/netlink.h>
  76 #include <linux/if_tunnel.h>
  77 #include <linux/rtnetlink.h>
  78
  79 #ifdef CONFIG_IPV6_PRIVACY
  80 #include <linux/random.h>
  81 #endif
  82
  83 #include <asm/uaccess.h>
  84
  85 #include <linux/proc_fs.h>
  86 #include <linux/seq_file.h>
  87
  88 /* Set to 3 to get tracing... */
  89 #define ACONF_DEBUG 2
  90
  91 #if ACONF_DEBUG >= 3
  92 #define ADBG(x) printk x
  93 #else
  94 #define ADBG(x)
  95 #endif
  96
  97 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
  99
 100 #ifdef CONFIG_SYSCTL
 101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 103 #endif
 104
 105 #ifdef CONFIG_IPV6_PRIVACY
 106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 108 static void ipv6_regen_rndid(unsigned long data);
 109
 110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 111 #endif
 112
 113 static int ipv6_count_addresses(struct inet6_dev *idev);
 114
 115 /*
 116  *      Configured unicast address hash table
 117  */
 118 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 119 static DEFINE_RWLOCK(addrconf_hash_lock);
 120
 121 static void addrconf_verify(unsigned long);
 122
 123 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 124 static DEFINE_SPINLOCK(addrconf_verify_lock);
 125
 126 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 128
 129 static int addrconf_ifdown(struct net_device *dev, int how);
 130
 131 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 132 static void addrconf_dad_timer(unsigned long data);
 133 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 134 static void addrconf_dad_run(struct inet6_dev *idev);
 135 static void addrconf_rs_timer(unsigned long data);
 136 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 137 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 138
 139 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 140                                 struct prefix_info *pinfo);
 141 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 142
 143 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 144
 145 struct ipv6_devconf ipv6_devconf __read_mostly = {
 146         .forwarding             = 0,
 147         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 148         .mtu6                   = IPV6_MIN_MTU,
 149         .accept_ra              = 1,
 150         .accept_redirects       = 1,
 151         .autoconf               = 1,
 152         .force_mld_version      = 0,
 153         .dad_transmits          = 1,
 154         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 155         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 156         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 157 #ifdef CONFIG_IPV6_PRIVACY
 158         .use_tempaddr           = 0,
 159         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 160         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 161         .regen_max_retry        = REGEN_MAX_RETRY,
 162         .max_desync_factor      = MAX_DESYNC_FACTOR,
 163 #endif
 164         .max_addresses          = IPV6_MAX_ADDRESSES,
 165         .accept_ra_defrtr       = 1,
 166         .accept_ra_pinfo        = 1,
 167 #ifdef CONFIG_IPV6_ROUTER_PREF
 168         .accept_ra_rtr_pref     = 1,
 169         .rtr_probe_interval     = 60 * HZ,
 170 #ifdef CONFIG_IPV6_ROUTE_INFO
 171         .accept_ra_rt_info_max_plen = 0,
 172 #endif
 173 #endif
 174         .proxy_ndp              = 0,
 175 };
 176
 177 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 178         .forwarding             = 0,
 179         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 180         .mtu6                   = IPV6_MIN_MTU,
 181         .accept_ra              = 1,
 182         .accept_redirects       = 1,
 183         .autoconf               = 1,
 184         .dad_transmits          = 1,
 185         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 186         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 187         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 188 #ifdef CONFIG_IPV6_PRIVACY
 189         .use_tempaddr           = 0,
 190         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 191         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 192         .regen_max_retry        = REGEN_MAX_RETRY,
 193         .max_desync_factor      = MAX_DESYNC_FACTOR,
 194 #endif
 195         .max_addresses          = IPV6_MAX_ADDRESSES,
 196         .accept_ra_defrtr       = 1,
 197         .accept_ra_pinfo        = 1,
 198 #ifdef CONFIG_IPV6_ROUTER_PREF
 199         .accept_ra_rtr_pref     = 1,
 200         .rtr_probe_interval     = 60 * HZ,
 201 #ifdef CONFIG_IPV6_ROUTE_INFO
 202         .accept_ra_rt_info_max_plen = 0,
 203 #endif
 204 #endif
 205         .proxy_ndp              = 0,
 206 };
 207
 208 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 209 #if 0
 210 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 211 #endif
 212 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 213
 214 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 215 {
 216         if (del_timer(&ifp->timer))
 217                 __in6_ifa_put(ifp);
 218 }
 219
 220 enum addrconf_timer_t
 221 {
 222         AC_NONE,
 223         AC_DAD,
 224         AC_RS,
 225 };
 226
 227 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 228                                enum addrconf_timer_t what,
 229                                unsigned long when)
 230 {
 231         if (!del_timer(&ifp->timer))
 232                 in6_ifa_hold(ifp);
 233
 234         switch (what) {
 235         case AC_DAD:
 236                 ifp->timer.function = addrconf_dad_timer;
 237                 break;
 238         case AC_RS:
 239                 ifp->timer.function = addrconf_rs_timer;
 240                 break;
 241         default:;
 242         }
 243         ifp->timer.expires = jiffies + when;
 244         add_timer(&ifp->timer);
 245 }
 246
 247 /* Nobody refers to this device, we may destroy it. */
 248
 249 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 250 {
 251         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 252         kfree(idev);
 253 }
 254
 255 void in6_dev_finish_destroy(struct inet6_dev *idev)
 256 {
 257         struct net_device *dev = idev->dev;
 258         BUG_TRAP(idev->addr_list==NULL);
 259         BUG_TRAP(idev->mc_list==NULL);
 260 #ifdef NET_REFCNT_DEBUG
 261         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 262 #endif
 263         dev_put(dev);
 264         if (!idev->dead) {
 265                 printk("Freeing alive inet6 device %p\n", idev);
 266                 return;
 267         }
 268         snmp6_free_dev(idev);
 269         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 270 }
 271
 272 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 273 {
 274         struct inet6_dev *ndev;
 275         struct in6_addr maddr;
 276
 277         ASSERT_RTNL();
 278
 279         if (dev->mtu < IPV6_MIN_MTU)
 280                 return NULL;
 281
 282         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 283
 284         if (ndev == NULL)
 285                 return NULL;
 286
 287         rwlock_init(&ndev->lock);
 288         ndev->dev = dev;
 289         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 290         ndev->cnf.mtu6 = dev->mtu;
 291         ndev->cnf.sysctl = NULL;
 292         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 293         if (ndev->nd_parms == NULL) {
 294                 kfree(ndev);
 295                 return NULL;
 296         }
 297         /* We refer to the device */
 298         dev_hold(dev);
 299
 300         if (snmp6_alloc_dev(ndev) < 0) {
 301                 ADBG((KERN_WARNING
 302                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 303                         __FUNCTION__, dev->name));
 304                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 305                 ndev->dead = 1;
 306                 in6_dev_finish_destroy(ndev);
 307                 return NULL;
 308         }
 309
 310         if (snmp6_register_dev(ndev) < 0) {
 311                 ADBG((KERN_WARNING
 312                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 313                         __FUNCTION__, dev->name));
 314                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 315                 ndev->dead = 1;
 316                 in6_dev_finish_destroy(ndev);
 317                 return NULL;
 318         }
 319
 320         /* One reference from device.  We must do this before
 321          * we invoke __ipv6_regen_rndid().
 322          */
 323         in6_dev_hold(ndev);
 324
 325 #ifdef CONFIG_IPV6_PRIVACY
 326         init_timer(&ndev->regen_timer);
 327         ndev->regen_timer.function = ipv6_regen_rndid;
 328         ndev->regen_timer.data = (unsigned long) ndev;
 329         if ((dev->flags&IFF_LOOPBACK) ||
 330             dev->type == ARPHRD_TUNNEL ||
 331 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 332             dev->type == ARPHRD_SIT ||
 333 #endif
 334             dev->type == ARPHRD_NONE) {
 335                 printk(KERN_INFO
 336                        "%s: Disabled Privacy Extensions\n",
 337                        dev->name);
 338                 ndev->cnf.use_tempaddr = -1;
 339         } else {
 340                 in6_dev_hold(ndev);
 341                 ipv6_regen_rndid((unsigned long) ndev);
 342         }
 343 #endif
 344
 345         if (netif_carrier_ok(dev))
 346                 ndev->if_flags |= IF_READY;
 347
 348
 349         ipv6_mc_init_dev(ndev);
 350         ndev->tstamp = jiffies;
 351 #ifdef CONFIG_SYSCTL
 352         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 353                               NET_IPV6_NEIGH, "ipv6",
 354                               &ndisc_ifinfo_sysctl_change,
 355                               NULL);
 356         addrconf_sysctl_register(ndev, &ndev->cnf);
 357 #endif
 358         /* protected by rtnl_lock */
 359         rcu_assign_pointer(dev->ip6_ptr, ndev);
 360
 361         /* Join all-node multicast group */
 362         ipv6_addr_all_nodes(&maddr);
 363         ipv6_dev_mc_inc(dev, &maddr);
 364
 365         return ndev;
 366 }
 367
 368 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 369 {
 370         struct inet6_dev *idev;
 371
 372         ASSERT_RTNL();
 373
 374         if ((idev = __in6_dev_get(dev)) == NULL) {
 375                 if ((idev = ipv6_add_dev(dev)) == NULL)
 376                         return NULL;
 377         }
 378
 379         if (dev->flags&IFF_UP)
 380                 ipv6_mc_up(idev);
 381         return idev;
 382 }
 383
 384 #ifdef CONFIG_SYSCTL
 385 static void dev_forward_change(struct inet6_dev *idev)
 386 {
 387         struct net_device *dev;
 388         struct inet6_ifaddr *ifa;
 389         struct in6_addr addr;
 390
 391         if (!idev)
 392                 return;
 393         dev = idev->dev;
 394         if (dev && (dev->flags & IFF_MULTICAST)) {
 395                 ipv6_addr_all_routers(&addr);
 396
 397                 if (idev->cnf.forwarding)
 398                         ipv6_dev_mc_inc(dev, &addr);
 399                 else
 400                         ipv6_dev_mc_dec(dev, &addr);
 401         }
 402         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 403                 if (ifa->flags&IFA_F_TENTATIVE)
 404                         continue;
 405                 if (idev->cnf.forwarding)
 406                         addrconf_join_anycast(ifa);
 407                 else
 408                         addrconf_leave_anycast(ifa);
 409         }
 410 }
 411
 412
 413 static void addrconf_forward_change(void)
 414 {
 415         struct net_device *dev;
 416         struct inet6_dev *idev;
 417
 418         read_lock(&dev_base_lock);
 419         for (dev=dev_base; dev; dev=dev->next) {
 420                 rcu_read_lock();
 421                 idev = __in6_dev_get(dev);
 422                 if (idev) {
 423                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 424                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 425                         if (changed)
 426                                 dev_forward_change(idev);
 427                 }
 428                 rcu_read_unlock();
 429         }
 430         read_unlock(&dev_base_lock);
 431 }
 432 #endif
 433
 434 /* Nobody refers to this ifaddr, destroy it */
 435
 436 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 437 {
 438         BUG_TRAP(ifp->if_next==NULL);
 439         BUG_TRAP(ifp->lst_next==NULL);
 440 #ifdef NET_REFCNT_DEBUG
 441         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 442 #endif
 443
 444         in6_dev_put(ifp->idev);
 445
 446         if (del_timer(&ifp->timer))
 447                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 448
 449         if (!ifp->dead) {
 450                 printk("Freeing alive inet6 address %p\n", ifp);
 451                 return;
 452         }
 453         dst_release(&ifp->rt->u.dst);
 454
 455         kfree(ifp);
 456 }
 457
 458 static void
 459 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 460 {
 461         struct inet6_ifaddr *ifa, **ifap;
 462         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 463
 464         /*
 465          * Each device address list is sorted in order of scope -
 466          * global before linklocal.
 467          */
 468         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 469              ifap = &ifa->if_next) {
 470                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 471                         break;
 472         }
 473
 474         ifp->if_next = *ifap;
 475         *ifap = ifp;
 476 }
 477
 478 /* On success it returns ifp with increased reference count */
 479
 480 static struct inet6_ifaddr *
 481 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 482               int scope, u32 flags)
 483 {
 484         struct inet6_ifaddr *ifa = NULL;
 485         struct rt6_info *rt;
 486         int hash;
 487         int err = 0;
 488
 489         rcu_read_lock_bh();
 490         if (idev->dead) {
 491                 err = -ENODEV;                  /*XXX*/
 492                 goto out2;
 493         }
 494
 495         write_lock(&addrconf_hash_lock);
 496
 497         /* Ignore adding duplicate addresses on an interface */
 498         if (ipv6_chk_same_addr(addr, idev->dev)) {
 499                 ADBG(("ipv6_add_addr: already assigned\n"));
 500                 err = -EEXIST;
 501                 goto out;
 502         }
 503
 504         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 505
 506         if (ifa == NULL) {
 507                 ADBG(("ipv6_add_addr: malloc failed\n"));
 508                 err = -ENOBUFS;
 509                 goto out;
 510         }
 511
 512         rt = addrconf_dst_alloc(idev, addr, 0);
 513         if (IS_ERR(rt)) {
 514                 err = PTR_ERR(rt);
 515                 goto out;
 516         }
 517
 518         ipv6_addr_copy(&ifa->addr, addr);
 519
 520         spin_lock_init(&ifa->lock);
 521         init_timer(&ifa->timer);
 522         ifa->timer.data = (unsigned long) ifa;
 523         ifa->scope = scope;
 524         ifa->prefix_len = pfxlen;
 525         ifa->flags = flags | IFA_F_TENTATIVE;
 526         ifa->cstamp = ifa->tstamp = jiffies;
 527
 528         ifa->rt = rt;
 529
 530         ifa->idev = idev;
 531         in6_dev_hold(idev);
 532         /* For caller */
 533         in6_ifa_hold(ifa);
 534
 535         /* Add to big hash table */
 536         hash = ipv6_addr_hash(addr);
 537
 538         ifa->lst_next = inet6_addr_lst[hash];
 539         inet6_addr_lst[hash] = ifa;
 540         in6_ifa_hold(ifa);
 541         write_unlock(&addrconf_hash_lock);
 542
 543         write_lock(&idev->lock);
 544         /* Add to inet6_dev unicast addr list. */
 545         ipv6_link_dev_addr(idev, ifa);
 546
 547 #ifdef CONFIG_IPV6_PRIVACY
 548         if (ifa->flags&IFA_F_TEMPORARY) {
 549                 ifa->tmp_next = idev->tempaddr_list;
 550                 idev->tempaddr_list = ifa;
 551                 in6_ifa_hold(ifa);
 552         }
 553 #endif
 554
 555         in6_ifa_hold(ifa);
 556         write_unlock(&idev->lock);
 557 out2:
 558         rcu_read_unlock_bh();
 559
 560         if (likely(err == 0))
 561                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 562         else {
 563                 kfree(ifa);
 564                 ifa = ERR_PTR(err);
 565         }
 566
 567         return ifa;
 568 out:
 569         write_unlock(&addrconf_hash_lock);
 570         goto out2;
 571 }
 572
 573 /* This function wants to get referenced ifp and releases it before return */
 574
 575 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 576 {
 577         struct inet6_ifaddr *ifa, **ifap;
 578         struct inet6_dev *idev = ifp->idev;
 579         int hash;
 580         int deleted = 0, onlink = 0;
 581         unsigned long expires = jiffies;
 582
 583         hash = ipv6_addr_hash(&ifp->addr);
 584
 585         ifp->dead = 1;
 586
 587         write_lock_bh(&addrconf_hash_lock);
 588         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 589              ifap = &ifa->lst_next) {
 590                 if (ifa == ifp) {
 591                         *ifap = ifa->lst_next;
 592                         __in6_ifa_put(ifp);
 593                         ifa->lst_next = NULL;
 594                         break;
 595                 }
 596         }
 597         write_unlock_bh(&addrconf_hash_lock);
 598
 599         write_lock_bh(&idev->lock);
 600 #ifdef CONFIG_IPV6_PRIVACY
 601         if (ifp->flags&IFA_F_TEMPORARY) {
 602                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 603                      ifap = &ifa->tmp_next) {
 604                         if (ifa == ifp) {
 605                                 *ifap = ifa->tmp_next;
 606                                 if (ifp->ifpub) {
 607                                         in6_ifa_put(ifp->ifpub);
 608                                         ifp->ifpub = NULL;
 609                                 }
 610                                 __in6_ifa_put(ifp);
 611                                 ifa->tmp_next = NULL;
 612                                 break;
 613                         }
 614                 }
 615         }
 616 #endif
 617
 618         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 619                 if (ifa == ifp) {
 620                         *ifap = ifa->if_next;
 621                         __in6_ifa_put(ifp);
 622                         ifa->if_next = NULL;
 623                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 624                                 break;
 625                         deleted = 1;
 626                         continue;
 627                 } else if (ifp->flags & IFA_F_PERMANENT) {
 628                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 629                                               ifp->prefix_len)) {
 630                                 if (ifa->flags & IFA_F_PERMANENT) {
 631                                         onlink = 1;
 632                                         if (deleted)
 633                                                 break;
 634                                 } else {
 635                                         unsigned long lifetime;
 636
 637                                         if (!onlink)
 638                                                 onlink = -1;
 639
 640                                         spin_lock(&ifa->lock);
 641                                         lifetime = min_t(unsigned long,
 642                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 643                                         if (time_before(expires,
 644                                                         ifa->tstamp + lifetime * HZ))
 645                                                 expires = ifa->tstamp + lifetime * HZ;
 646                                         spin_unlock(&ifa->lock);
 647                                 }
 648                         }
 649                 }
 650                 ifap = &ifa->if_next;
 651         }
 652         write_unlock_bh(&idev->lock);
 653
 654         ipv6_ifa_notify(RTM_DELADDR, ifp);
 655
 656         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 657
 658         addrconf_del_timer(ifp);
 659
 660         /*
 661          * Purge or update corresponding prefix
 662          *
 663          * 1) we don't purge prefix here if address was not permanent.
 664          *    prefix is managed by its own lifetime.
 665          * 2) if there're no addresses, delete prefix.
 666          * 3) if there're still other permanent address(es),
 667          *    corresponding prefix is still permanent.
 668          * 4) otherwise, update prefix lifetime to the
 669          *    longest valid lifetime among the corresponding
 670          *    addresses on the device.
 671          *    Note: subsequent RA will update lifetime.
 672          *
 673          * --yoshfuji
 674          */
 675         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 676                 struct in6_addr prefix;
 677                 struct rt6_info *rt;
 678
 679                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 680                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 681
 682                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 683                         if (onlink == 0) {
 684                                 ip6_del_rt(rt);
 685                                 rt = NULL;
 686                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 687                                 rt->rt6i_expires = expires;
 688                                 rt->rt6i_flags |= RTF_EXPIRES;
 689                         }
 690                 }
 691                 dst_release(&rt->u.dst);
 692         }
 693
 694         in6_ifa_put(ifp);
 695 }
 696
 697 #ifdef CONFIG_IPV6_PRIVACY
 698 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 699 {
 700         struct inet6_dev *idev = ifp->idev;
 701         struct in6_addr addr, *tmpaddr;
 702         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 703         int tmp_plen;
 704         int ret = 0;
 705         int max_addresses;
 706
 707         write_lock(&idev->lock);
 708         if (ift) {
 709                 spin_lock_bh(&ift->lock);
 710                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 711                 spin_unlock_bh(&ift->lock);
 712                 tmpaddr = &addr;
 713         } else {
 714                 tmpaddr = NULL;
 715         }
 716 retry:
 717         in6_dev_hold(idev);
 718         if (idev->cnf.use_tempaddr <= 0) {
 719                 write_unlock(&idev->lock);
 720                 printk(KERN_INFO
 721                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 722                 in6_dev_put(idev);
 723                 ret = -1;
 724                 goto out;
 725         }
 726         spin_lock_bh(&ifp->lock);
 727         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 728                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 729                 spin_unlock_bh(&ifp->lock);
 730                 write_unlock(&idev->lock);
 731                 printk(KERN_WARNING
 732                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 733                 in6_dev_put(idev);
 734                 ret = -1;
 735                 goto out;
 736         }
 737         in6_ifa_hold(ifp);
 738         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 739         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 740                 spin_unlock_bh(&ifp->lock);
 741                 write_unlock(&idev->lock);
 742                 printk(KERN_WARNING
 743                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 744                 in6_ifa_put(ifp);
 745                 in6_dev_put(idev);
 746                 ret = -1;
 747                 goto out;
 748         }
 749         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 750         tmp_valid_lft = min_t(__u32,
 751                               ifp->valid_lft,
 752                               idev->cnf.temp_valid_lft);
 753         tmp_prefered_lft = min_t(__u32,
 754                                  ifp->prefered_lft,
 755                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 756         tmp_plen = ifp->prefix_len;
 757         max_addresses = idev->cnf.max_addresses;
 758         tmp_cstamp = ifp->cstamp;
 759         tmp_tstamp = ifp->tstamp;
 760         spin_unlock_bh(&ifp->lock);
 761
 762         write_unlock(&idev->lock);
 763         ift = !max_addresses ||
 764               ipv6_count_addresses(idev) < max_addresses ?
 765                 ipv6_add_addr(idev, &addr, tmp_plen,
 766                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 767         if (!ift || IS_ERR(ift)) {
 768                 in6_ifa_put(ifp);
 769                 in6_dev_put(idev);
 770                 printk(KERN_INFO
 771                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 772                 tmpaddr = &addr;
 773                 write_lock(&idev->lock);
 774                 goto retry;
 775         }
 776
 777         spin_lock_bh(&ift->lock);
 778         ift->ifpub = ifp;
 779         ift->valid_lft = tmp_valid_lft;
 780         ift->prefered_lft = tmp_prefered_lft;
 781         ift->cstamp = tmp_cstamp;
 782         ift->tstamp = tmp_tstamp;
 783         spin_unlock_bh(&ift->lock);
 784
 785         addrconf_dad_start(ift, 0);
 786         in6_ifa_put(ift);
 787         in6_dev_put(idev);
 788 out:
 789         return ret;
 790 }
 791 #endif
 792
 793 /*
 794  *      Choose an appropriate source address (RFC3484)
 795  */
 796 struct ipv6_saddr_score {
 797         int             addr_type;
 798         unsigned int    attrs;
 799         int             matchlen;
 800         int             scope;
 801         unsigned int    rule;
 802 };
 803
 804 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 805 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 806 #define IPV6_SADDR_SCORE_HOA            0x0008
 807 #define IPV6_SADDR_SCORE_OIF            0x0010
 808 #define IPV6_SADDR_SCORE_LABEL          0x0020
 809 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 810
 811 static int inline ipv6_saddr_preferred(int type)
 812 {
 813         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 814                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 815                 return 1;
 816         return 0;
 817 }
 818
 819 /* static matching label */
 820 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 821 {
 822  /*
 823   *     prefix (longest match)  label
 824   *     -----------------------------
 825   *     ::1/128                 0
 826   *     ::/0                    1
 827   *     2002::/16               2
 828   *     ::/96                   3
 829   *     ::ffff:0:0/96           4
 830   *     fc00::/7                5
 831   *     2001::/32               6
 832   */
 833         if (type & IPV6_ADDR_LOOPBACK)
 834                 return 0;
 835         else if (type & IPV6_ADDR_COMPATv4)
 836                 return 3;
 837         else if (type & IPV6_ADDR_MAPPED)
 838                 return 4;
 839         else if (addr->s6_addr32[0] == htonl(0x20010000))
 840                 return 6;
 841         else if (addr->s6_addr16[0] == htons(0x2002))
 842                 return 2;
 843         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 844                 return 5;
 845         return 1;
 846 }
 847
 848 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 849                        struct in6_addr *daddr, struct in6_addr *saddr)
 850 {
 851         struct ipv6_saddr_score hiscore;
 852         struct inet6_ifaddr *ifa_result = NULL;
 853         int daddr_type = __ipv6_addr_type(daddr);
 854         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 855         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 856         struct net_device *dev;
 857
 858         memset(&hiscore, 0, sizeof(hiscore));
 859
 860         read_lock(&dev_base_lock);
 861         rcu_read_lock();
 862
 863         for (dev = dev_base; dev; dev=dev->next) {
 864                 struct inet6_dev *idev;
 865                 struct inet6_ifaddr *ifa;
 866
 867                 /* Rule 0: Candidate Source Address (section 4)
 868                  *  - multicast and link-local destination address,
 869                  *    the set of candidate source address MUST only
 870                  *    include addresses assigned to interfaces
 871                  *    belonging to the same link as the outgoing
 872                  *    interface.
 873                  * (- For site-local destination addresses, the
 874                  *    set of candidate source addresses MUST only
 875                  *    include addresses assigned to interfaces
 876                  *    belonging to the same site as the outgoing
 877                  *    interface.)
 878                  */
 879                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 880                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 881                     daddr_dev && dev != daddr_dev)
 882                         continue;
 883
 884                 idev = __in6_dev_get(dev);
 885                 if (!idev)
 886                         continue;
 887
 888                 read_lock_bh(&idev->lock);
 889                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 890                         struct ipv6_saddr_score score;
 891
 892                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 893
 894                         /* Rule 0:
 895                          * - Tentative Address (RFC2462 section 5.4)
 896                          *  - A tentative address is not considered
 897                          *    "assigned to an interface" in the traditional
 898                          *    sense.
 899                          * - Candidate Source Address (section 4)
 900                          *  - In any case, anycast addresses, multicast
 901                          *    addresses, and the unspecified address MUST
 902                          *    NOT be included in a candidate set.
 903                          */
 904                         if (ifa->flags & IFA_F_TENTATIVE)
 905                                 continue;
 906                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 907                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 908                                 LIMIT_NETDEBUG(KERN_DEBUG
 909                                                "ADDRCONF: unspecified / multicast address"
 910                                                "assigned as unicast address on %s",
 911                                                dev->name);
 912                                 continue;
 913                         }
 914
 915                         score.attrs = 0;
 916                         score.matchlen = 0;
 917                         score.scope = 0;
 918                         score.rule = 0;
 919
 920                         if (ifa_result == NULL) {
 921                                 /* record it if the first available entry */
 922                                 goto record_it;
 923                         }
 924
 925                         /* Rule 1: Prefer same address */
 926                         if (hiscore.rule < 1) {
 927                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 928                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 929                                 hiscore.rule++;
 930                         }
 931                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 932                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 933                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 934                                         score.rule = 1;
 935                                         goto record_it;
 936                                 }
 937                         } else {
 938                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 939                                         continue;
 940                         }
 941
 942                         /* Rule 2: Prefer appropriate scope */
 943                         if (hiscore.rule < 2) {
 944                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
 945                                 hiscore.rule++;
 946                         }
 947                         score.scope = __ipv6_addr_src_scope(score.addr_type);
 948                         if (hiscore.scope < score.scope) {
 949                                 if (hiscore.scope < daddr_scope) {
 950                                         score.rule = 2;
 951                                         goto record_it;
 952                                 } else
 953                                         continue;
 954                         } else if (score.scope < hiscore.scope) {
 955                                 if (score.scope < daddr_scope)
 956                                         break; /* addresses sorted by scope */
 957                                 else {
 958                                         score.rule = 2;
 959                                         goto record_it;
 960                                 }
 961                         }
 962
 963                         /* Rule 3: Avoid deprecated address */
 964                         if (hiscore.rule < 3) {
 965                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
 966                                     !(ifa_result->flags & IFA_F_DEPRECATED))
 967                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 968                                 hiscore.rule++;
 969                         }
 970                         if (ipv6_saddr_preferred(score.addr_type) ||
 971                             !(ifa->flags & IFA_F_DEPRECATED)) {
 972                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
 973                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
 974                                         score.rule = 3;
 975                                         goto record_it;
 976                                 }
 977                         } else {
 978                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
 979                                         continue;
 980                         }
 981
 982                         /* Rule 4: Prefer home address */
 983 #ifdef CONFIG_IPV6_MIP6
 984                         if (hiscore.rule < 4) {
 985                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
 986                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
 987                                 hiscore.rule++;
 988                         }
 989                         if (ifa->flags & IFA_F_HOMEADDRESS) {
 990                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
 991                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
 992                                         score.rule = 4;
 993                                         goto record_it;
 994                                 }
 995                         } else {
 996                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
 997                                         continue;
 998                         }
 999 #else
1000                         if (hiscore.rule < 4)
1001                                 hiscore.rule++;
1002 #endif
1003
1004                         /* Rule 5: Prefer outgoing interface */
1005                         if (hiscore.rule < 5) {
1006                                 if (daddr_dev == NULL ||
1007                                     daddr_dev == ifa_result->idev->dev)
1008                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1009                                 hiscore.rule++;
1010                         }
1011                         if (daddr_dev == NULL ||
1012                             daddr_dev == ifa->idev->dev) {
1013                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1014                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1015                                         score.rule = 5;
1016                                         goto record_it;
1017                                 }
1018                         } else {
1019                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1020                                         continue;
1021                         }
1022
1023                         /* Rule 6: Prefer matching label */
1024                         if (hiscore.rule < 6) {
1025                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1026                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1027                                 hiscore.rule++;
1028                         }
1029                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1030                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1031                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1032                                         score.rule = 6;
1033                                         goto record_it;
1034                                 }
1035                         } else {
1036                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1037                                         continue;
1038                         }
1039
1040 #ifdef CONFIG_IPV6_PRIVACY
1041                         /* Rule 7: Prefer public address
1042                          * Note: prefer temprary address if use_tempaddr >= 2
1043                          */
1044                         if (hiscore.rule < 7) {
1045                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1046                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1047                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1048                                 hiscore.rule++;
1049                         }
1050                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1051                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1052                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1053                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1054                                         score.rule = 7;
1055                                         goto record_it;
1056                                 }
1057                         } else {
1058                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1059                                         continue;
1060                         }
1061 #else
1062                         if (hiscore.rule < 7)
1063                                 hiscore.rule++;
1064 #endif
1065                         /* Rule 8: Use longest matching prefix */
1066                         if (hiscore.rule < 8) {
1067                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1068                                 hiscore.rule++;
1069                         }
1070                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1071                         if (score.matchlen > hiscore.matchlen) {
1072                                 score.rule = 8;
1073                                 goto record_it;
1074                         }
1075 #if 0
1076                         else if (score.matchlen < hiscore.matchlen)
1077                                 continue;
1078 #endif
1079
1080                         /* Final Rule: choose first available one */
1081                         continue;
1082 record_it:
1083                         if (ifa_result)
1084                                 in6_ifa_put(ifa_result);
1085                         in6_ifa_hold(ifa);
1086                         ifa_result = ifa;
1087                         hiscore = score;
1088                 }
1089                 read_unlock_bh(&idev->lock);
1090         }
1091         rcu_read_unlock();
1092         read_unlock(&dev_base_lock);
1093
1094         if (!ifa_result)
1095                 return -EADDRNOTAVAIL;
1096
1097         ipv6_addr_copy(saddr, &ifa_result->addr);
1098         in6_ifa_put(ifa_result);
1099         return 0;
1100 }
1101
1102
1103 int ipv6_get_saddr(struct dst_entry *dst,
1104                    struct in6_addr *daddr, struct in6_addr *saddr)
1105 {
1106         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1107 }
1108
1109
1110 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1111 {
1112         struct inet6_dev *idev;
1113         int err = -EADDRNOTAVAIL;
1114
1115         rcu_read_lock();
1116         if ((idev = __in6_dev_get(dev)) != NULL) {
1117                 struct inet6_ifaddr *ifp;
1118
1119                 read_lock_bh(&idev->lock);
1120                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1121                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1122                                 ipv6_addr_copy(addr, &ifp->addr);
1123                                 err = 0;
1124                                 break;
1125                         }
1126                 }
1127                 read_unlock_bh(&idev->lock);
1128         }
1129         rcu_read_unlock();
1130         return err;
1131 }
1132
1133 static int ipv6_count_addresses(struct inet6_dev *idev)
1134 {
1135         int cnt = 0;
1136         struct inet6_ifaddr *ifp;
1137
1138         read_lock_bh(&idev->lock);
1139         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1140                 cnt++;
1141         read_unlock_bh(&idev->lock);
1142         return cnt;
1143 }
1144
1145 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1146 {
1147         struct inet6_ifaddr * ifp;
1148         u8 hash = ipv6_addr_hash(addr);
1149
1150         read_lock_bh(&addrconf_hash_lock);
1151         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1152                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1153                     !(ifp->flags&IFA_F_TENTATIVE)) {
1154                         if (dev == NULL || ifp->idev->dev == dev ||
1155                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1156                                 break;
1157                 }
1158         }
1159         read_unlock_bh(&addrconf_hash_lock);
1160         return ifp != NULL;
1161 }
1162
1163 static
1164 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1165 {
1166         struct inet6_ifaddr * ifp;
1167         u8 hash = ipv6_addr_hash(addr);
1168
1169         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1170                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1171                         if (dev == NULL || ifp->idev->dev == dev)
1172                                 break;
1173                 }
1174         }
1175         return ifp != NULL;
1176 }
1177
1178 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1179 {
1180         struct inet6_ifaddr * ifp;
1181         u8 hash = ipv6_addr_hash(addr);
1182
1183         read_lock_bh(&addrconf_hash_lock);
1184         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1185                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1186                         if (dev == NULL || ifp->idev->dev == dev ||
1187                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1188                                 in6_ifa_hold(ifp);
1189                                 break;
1190                         }
1191                 }
1192         }
1193         read_unlock_bh(&addrconf_hash_lock);
1194
1195         return ifp;
1196 }
1197
1198 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1199 {
1200         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1201         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1202         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1203         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1204         int sk_ipv6only = ipv6_only_sock(sk);
1205         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1206         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1207         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1208
1209         if (!sk2_rcv_saddr && !sk_ipv6only)
1210                 return 1;
1211
1212         if (addr_type2 == IPV6_ADDR_ANY &&
1213             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1214                 return 1;
1215
1216         if (addr_type == IPV6_ADDR_ANY &&
1217             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1218                 return 1;
1219
1220         if (sk2_rcv_saddr6 &&
1221             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1222                 return 1;
1223
1224         if (addr_type == IPV6_ADDR_MAPPED &&
1225             !sk2_ipv6only &&
1226             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1227                 return 1;
1228
1229         return 0;
1230 }
1231
1232 /* Gets referenced address, destroys ifaddr */
1233
1234 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1235 {
1236         if (ifp->flags&IFA_F_PERMANENT) {
1237                 spin_lock_bh(&ifp->lock);
1238                 addrconf_del_timer(ifp);
1239                 ifp->flags |= IFA_F_TENTATIVE;
1240                 spin_unlock_bh(&ifp->lock);
1241                 in6_ifa_put(ifp);
1242 #ifdef CONFIG_IPV6_PRIVACY
1243         } else if (ifp->flags&IFA_F_TEMPORARY) {
1244                 struct inet6_ifaddr *ifpub;
1245                 spin_lock_bh(&ifp->lock);
1246                 ifpub = ifp->ifpub;
1247                 if (ifpub) {
1248                         in6_ifa_hold(ifpub);
1249                         spin_unlock_bh(&ifp->lock);
1250                         ipv6_create_tempaddr(ifpub, ifp);
1251                         in6_ifa_put(ifpub);
1252                 } else {
1253                         spin_unlock_bh(&ifp->lock);
1254                 }
1255                 ipv6_del_addr(ifp);
1256 #endif
1257         } else
1258                 ipv6_del_addr(ifp);
1259 }
1260
1261 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1262 {
1263         if (net_ratelimit())
1264                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1265         addrconf_dad_stop(ifp);
1266 }
1267
1268 /* Join to solicited addr multicast group. */
1269
1270 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1271 {
1272         struct in6_addr maddr;
1273
1274         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1275                 return;
1276
1277         addrconf_addr_solict_mult(addr, &maddr);
1278         ipv6_dev_mc_inc(dev, &maddr);
1279 }
1280
1281 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1282 {
1283         struct in6_addr maddr;
1284
1285         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1286                 return;
1287
1288         addrconf_addr_solict_mult(addr, &maddr);
1289         __ipv6_dev_mc_dec(idev, &maddr);
1290 }
1291
1292 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1293 {
1294         struct in6_addr addr;
1295         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1296         if (ipv6_addr_any(&addr))
1297                 return;
1298         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1299 }
1300
1301 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1302 {
1303         struct in6_addr addr;
1304         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1305         if (ipv6_addr_any(&addr))
1306                 return;
1307         __ipv6_dev_ac_dec(ifp->idev, &addr);
1308 }
1309
1310 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1311 {
1312         if (dev->addr_len != ETH_ALEN)
1313                 return -1;
1314         memcpy(eui, dev->dev_addr, 3);
1315         memcpy(eui + 5, dev->dev_addr + 3, 3);
1316
1317         /*
1318          * The zSeries OSA network cards can be shared among various
1319          * OS instances, but the OSA cards have only one MAC address.
1320          * This leads to duplicate address conflicts in conjunction
1321          * with IPv6 if more than one instance uses the same card.
1322          *
1323          * The driver for these cards can deliver a unique 16-bit
1324          * identifier for each instance sharing the same card.  It is
1325          * placed instead of 0xFFFE in the interface identifier.  The
1326          * "u" bit of the interface identifier is not inverted in this
1327          * case.  Hence the resulting interface identifier has local
1328          * scope according to RFC2373.
1329          */
1330         if (dev->dev_id) {
1331                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1332                 eui[4] = dev->dev_id & 0xFF;
1333         } else {
1334                 eui[3] = 0xFF;
1335                 eui[4] = 0xFE;
1336                 eui[0] ^= 2;
1337         }
1338         return 0;
1339 }
1340
1341 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1342 {
1343         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1344         if (dev->addr_len != ARCNET_ALEN)
1345                 return -1;
1346         memset(eui, 0, 7);
1347         eui[7] = *(u8*)dev->dev_addr;
1348         return 0;
1349 }
1350
1351 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1352 {
1353         if (dev->addr_len != INFINIBAND_ALEN)
1354                 return -1;
1355         memcpy(eui, dev->dev_addr + 12, 8);
1356         eui[0] |= 2;
1357         return 0;
1358 }
1359
1360 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1361 {
1362         switch (dev->type) {
1363         case ARPHRD_ETHER:
1364         case ARPHRD_FDDI:
1365         case ARPHRD_IEEE802_TR:
1366                 return addrconf_ifid_eui48(eui, dev);
1367         case ARPHRD_ARCNET:
1368                 return addrconf_ifid_arcnet(eui, dev);
1369         case ARPHRD_INFINIBAND:
1370                 return addrconf_ifid_infiniband(eui, dev);
1371         }
1372         return -1;
1373 }
1374
1375 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1376 {
1377         int err = -1;
1378         struct inet6_ifaddr *ifp;
1379
1380         read_lock_bh(&idev->lock);
1381         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1382                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1383                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1384                         err = 0;
1385                         break;
1386                 }
1387         }
1388         read_unlock_bh(&idev->lock);
1389         return err;
1390 }
1391
1392 #ifdef CONFIG_IPV6_PRIVACY
1393 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1394 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1395 {
1396 regen:
1397         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1398         idev->rndid[0] &= ~0x02;
1399
1400         /*
1401          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1402          * check if generated address is not inappropriate
1403          *
1404          *  - Reserved subnet anycast (RFC 2526)
1405          *      11111101 11....11 1xxxxxxx
1406          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1407          *      00-00-5E-FE-xx-xx-xx-xx
1408          *  - value 0
1409          *  - XXX: already assigned to an address on the device
1410          */
1411         if (idev->rndid[0] == 0xfd &&
1412             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1413             (idev->rndid[7]&0x80))
1414                 goto regen;
1415         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1416                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1417                         goto regen;
1418                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1419                         goto regen;
1420         }
1421
1422         return 0;
1423 }
1424
1425 static void ipv6_regen_rndid(unsigned long data)
1426 {
1427         struct inet6_dev *idev = (struct inet6_dev *) data;
1428         unsigned long expires;
1429
1430         rcu_read_lock_bh();
1431         write_lock_bh(&idev->lock);
1432
1433         if (idev->dead)
1434                 goto out;
1435
1436         if (__ipv6_regen_rndid(idev) < 0)
1437                 goto out;
1438
1439         expires = jiffies +
1440                 idev->cnf.temp_prefered_lft * HZ -
1441                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1442         if (time_before(expires, jiffies)) {
1443                 printk(KERN_WARNING
1444                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1445                         idev->dev->name);
1446                 goto out;
1447         }
1448
1449         if (!mod_timer(&idev->regen_timer, expires))
1450                 in6_dev_hold(idev);
1451
1452 out:
1453         write_unlock_bh(&idev->lock);
1454         rcu_read_unlock_bh();
1455         in6_dev_put(idev);
1456 }
1457
1458 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1459         int ret = 0;
1460
1461         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1462                 ret = __ipv6_regen_rndid(idev);
1463         return ret;
1464 }
1465 #endif
1466
1467 /*
1468  *      Add prefix route.
1469  */
1470
1471 static void
1472 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1473                       unsigned long expires, u32 flags)
1474 {
1475         struct fib6_config cfg = {
1476                 .fc_table = RT6_TABLE_PREFIX,
1477                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1478                 .fc_ifindex = dev->ifindex,
1479                 .fc_expires = expires,
1480                 .fc_dst_len = plen,
1481                 .fc_flags = RTF_UP | flags,
1482         };
1483
1484         ipv6_addr_copy(&cfg.fc_dst, pfx);
1485
1486         /* Prevent useless cloning on PtP SIT.
1487            This thing is done here expecting that the whole
1488            class of non-broadcast devices need not cloning.
1489          */
1490 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1491         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1492                 cfg.fc_flags |= RTF_NONEXTHOP;
1493 #endif
1494
1495         ip6_route_add(&cfg);
1496 }
1497
1498 /* Create "default" multicast route to the interface */
1499
1500 static void addrconf_add_mroute(struct net_device *dev)
1501 {
1502         struct fib6_config cfg = {
1503                 .fc_table = RT6_TABLE_LOCAL,
1504                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1505                 .fc_ifindex = dev->ifindex,
1506                 .fc_dst_len = 8,
1507                 .fc_flags = RTF_UP,
1508         };
1509
1510         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1511
1512         ip6_route_add(&cfg);
1513 }
1514
1515 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1516 static void sit_route_add(struct net_device *dev)
1517 {
1518         struct fib6_config cfg = {
1519                 .fc_table = RT6_TABLE_MAIN,
1520                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1521                 .fc_ifindex = dev->ifindex,
1522                 .fc_dst_len = 96,
1523                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1524         };
1525
1526         /* prefix length - 96 bits "::d.d.d.d" */
1527         ip6_route_add(&cfg);
1528 }
1529 #endif
1530
1531 static void addrconf_add_lroute(struct net_device *dev)
1532 {
1533         struct in6_addr addr;
1534
1535         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1536         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1537 }
1538
1539 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1540 {
1541         struct inet6_dev *idev;
1542
1543         ASSERT_RTNL();
1544
1545         if ((idev = ipv6_find_idev(dev)) == NULL)
1546                 return NULL;
1547
1548         /* Add default multicast route */
1549         addrconf_add_mroute(dev);
1550
1551         /* Add link local route */
1552         addrconf_add_lroute(dev);
1553         return idev;
1554 }
1555
1556 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1557 {
1558         struct prefix_info *pinfo;
1559         __u32 valid_lft;
1560         __u32 prefered_lft;
1561         int addr_type;
1562         unsigned long rt_expires;
1563         struct inet6_dev *in6_dev;
1564
1565         pinfo = (struct prefix_info *) opt;
1566
1567         if (len < sizeof(struct prefix_info)) {
1568                 ADBG(("addrconf: prefix option too short\n"));
1569                 return;
1570         }
1571
1572         /*
1573          *      Validation checks ([ADDRCONF], page 19)
1574          */
1575
1576         addr_type = ipv6_addr_type(&pinfo->prefix);
1577
1578         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1579                 return;
1580
1581         valid_lft = ntohl(pinfo->valid);
1582         prefered_lft = ntohl(pinfo->prefered);
1583
1584         if (prefered_lft > valid_lft) {
1585                 if (net_ratelimit())
1586                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1587                 return;
1588         }
1589
1590         in6_dev = in6_dev_get(dev);
1591
1592         if (in6_dev == NULL) {
1593                 if (net_ratelimit())
1594                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1595                 return;
1596         }
1597
1598         /*
1599          *      Two things going on here:
1600          *      1) Add routes for on-link prefixes
1601          *      2) Configure prefixes with the auto flag set
1602          */
1603
1604         /* Avoid arithmetic overflow. Really, we could
1605            save rt_expires in seconds, likely valid_lft,
1606            but it would require division in fib gc, that it
1607            not good.
1608          */
1609         if (valid_lft >= 0x7FFFFFFF/HZ)
1610                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1611         else
1612                 rt_expires = valid_lft * HZ;
1613
1614         /*
1615          * We convert this (in jiffies) to clock_t later.
1616          * Avoid arithmetic overflow there as well.
1617          * Overflow can happen only if HZ < USER_HZ.
1618          */
1619         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1620                 rt_expires = 0x7FFFFFFF / USER_HZ;
1621
1622         if (pinfo->onlink) {
1623                 struct rt6_info *rt;
1624                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1625
1626                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1627                         if (rt->rt6i_flags&RTF_EXPIRES) {
1628                                 if (valid_lft == 0) {
1629                                         ip6_del_rt(rt);
1630                                         rt = NULL;
1631                                 } else {
1632                                         rt->rt6i_expires = jiffies + rt_expires;
1633                                 }
1634                         }
1635                 } else if (valid_lft) {
1636                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1637                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1638                 }
1639                 if (rt)
1640                         dst_release(&rt->u.dst);
1641         }
1642
1643         /* Try to figure out our local address for this prefix */
1644
1645         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1646                 struct inet6_ifaddr * ifp;
1647                 struct in6_addr addr;
1648                 int create = 0, update_lft = 0;
1649
1650                 if (pinfo->prefix_len == 64) {
1651                         memcpy(&addr, &pinfo->prefix, 8);
1652                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1653                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1654                                 in6_dev_put(in6_dev);
1655                                 return;
1656                         }
1657                         goto ok;
1658                 }
1659                 if (net_ratelimit())
1660                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1661                                pinfo->prefix_len);
1662                 in6_dev_put(in6_dev);
1663                 return;
1664
1665 ok:
1666
1667                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1668
1669                 if (ifp == NULL && valid_lft) {
1670                         int max_addresses = in6_dev->cnf.max_addresses;
1671
1672                         /* Do not allow to create too much of autoconfigured
1673                          * addresses; this would be too easy way to crash kernel.
1674                          */
1675                         if (!max_addresses ||
1676                             ipv6_count_addresses(in6_dev) < max_addresses)
1677                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1678                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1679
1680                         if (!ifp || IS_ERR(ifp)) {
1681                                 in6_dev_put(in6_dev);
1682                                 return;
1683                         }
1684
1685                         update_lft = create = 1;
1686                         ifp->cstamp = jiffies;
1687                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1688                 }
1689
1690                 if (ifp) {
1691                         int flags;
1692                         unsigned long now;
1693 #ifdef CONFIG_IPV6_PRIVACY
1694                         struct inet6_ifaddr *ift;
1695 #endif
1696                         u32 stored_lft;
1697
1698                         /* update lifetime (RFC2462 5.5.3 e) */
1699                         spin_lock(&ifp->lock);
1700                         now = jiffies;
1701                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1702                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1703                         else
1704                                 stored_lft = 0;
1705                         if (!update_lft && stored_lft) {
1706                                 if (valid_lft > MIN_VALID_LIFETIME ||
1707                                     valid_lft > stored_lft)
1708                                         update_lft = 1;
1709                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1710                                         /* valid_lft <= stored_lft is always true */
1711                                         /* XXX: IPsec */
1712                                         update_lft = 0;
1713                                 } else {
1714                                         valid_lft = MIN_VALID_LIFETIME;
1715                                         if (valid_lft < prefered_lft)
1716                                                 prefered_lft = valid_lft;
1717                                         update_lft = 1;
1718                                 }
1719                         }
1720
1721                         if (update_lft) {
1722                                 ifp->valid_lft = valid_lft;
1723                                 ifp->prefered_lft = prefered_lft;
1724                                 ifp->tstamp = now;
1725                                 flags = ifp->flags;
1726                                 ifp->flags &= ~IFA_F_DEPRECATED;
1727                                 spin_unlock(&ifp->lock);
1728
1729                                 if (!(flags&IFA_F_TENTATIVE))
1730                                         ipv6_ifa_notify(0, ifp);
1731                         } else
1732                                 spin_unlock(&ifp->lock);
1733
1734 #ifdef CONFIG_IPV6_PRIVACY
1735                         read_lock_bh(&in6_dev->lock);
1736                         /* update all temporary addresses in the list */
1737                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1738                                 /*
1739                                  * When adjusting the lifetimes of an existing
1740                                  * temporary address, only lower the lifetimes.
1741                                  * Implementations must not increase the
1742                                  * lifetimes of an existing temporary address
1743                                  * when processing a Prefix Information Option.
1744                                  */
1745                                 spin_lock(&ift->lock);
1746                                 flags = ift->flags;
1747                                 if (ift->valid_lft > valid_lft &&
1748                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1749                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1750                                 if (ift->prefered_lft > prefered_lft &&
1751                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1752                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1753                                 spin_unlock(&ift->lock);
1754                                 if (!(flags&IFA_F_TENTATIVE))
1755                                         ipv6_ifa_notify(0, ift);
1756                         }
1757
1758                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1759                                 /*
1760                                  * When a new public address is created as described in [ADDRCONF],
1761                                  * also create a new temporary address.
1762                                  */
1763                                 read_unlock_bh(&in6_dev->lock);
1764                                 ipv6_create_tempaddr(ifp, NULL);
1765                         } else {
1766                                 read_unlock_bh(&in6_dev->lock);
1767                         }
1768 #endif
1769                         in6_ifa_put(ifp);
1770                         addrconf_verify(0);
1771                 }
1772         }
1773         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1774         in6_dev_put(in6_dev);
1775 }
1776
1777 /*
1778  *      Set destination address.
1779  *      Special case for SIT interfaces where we create a new "virtual"
1780  *      device.
1781  */
1782 int addrconf_set_dstaddr(void __user *arg)
1783 {
1784         struct in6_ifreq ireq;
1785         struct net_device *dev;
1786         int err = -EINVAL;
1787
1788         rtnl_lock();
1789
1790         err = -EFAULT;
1791         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1792                 goto err_exit;
1793
1794         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1795
1796         err = -ENODEV;
1797         if (dev == NULL)
1798                 goto err_exit;
1799
1800 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1801         if (dev->type == ARPHRD_SIT) {
1802                 struct ifreq ifr;
1803                 mm_segment_t    oldfs;
1804                 struct ip_tunnel_parm p;
1805
1806                 err = -EADDRNOTAVAIL;
1807                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1808                         goto err_exit;
1809
1810                 memset(&p, 0, sizeof(p));
1811                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1812                 p.iph.saddr = 0;
1813                 p.iph.version = 4;
1814                 p.iph.ihl = 5;
1815                 p.iph.protocol = IPPROTO_IPV6;
1816                 p.iph.ttl = 64;
1817                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1818
1819                 oldfs = get_fs(); set_fs(KERNEL_DS);
1820                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1821                 set_fs(oldfs);
1822
1823                 if (err == 0) {
1824                         err = -ENOBUFS;
1825                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1826                                 goto err_exit;
1827                         err = dev_open(dev);
1828                 }
1829         }
1830 #endif
1831
1832 err_exit:
1833         rtnl_unlock();
1834         return err;
1835 }
1836
1837 /*
1838  *      Manual configuration of address on an interface
1839  */
1840 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1841                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1842 {
1843         struct inet6_ifaddr *ifp;
1844         struct inet6_dev *idev;
1845         struct net_device *dev;
1846         int scope;
1847         u32 flags = RTF_EXPIRES;
1848
1849         ASSERT_RTNL();
1850
1851         /* check the lifetime */
1852         if (!valid_lft || prefered_lft > valid_lft)
1853                 return -EINVAL;
1854
1855         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1856                 return -ENODEV;
1857
1858         if ((idev = addrconf_add_dev(dev)) == NULL)
1859                 return -ENOBUFS;
1860
1861         scope = ipv6_addr_scope(pfx);
1862
1863         if (valid_lft == INFINITY_LIFE_TIME) {
1864                 ifa_flags |= IFA_F_PERMANENT;
1865                 flags = 0;
1866         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1867                 valid_lft = 0x7FFFFFFF/HZ;
1868
1869         if (prefered_lft == 0)
1870                 ifa_flags |= IFA_F_DEPRECATED;
1871         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1872                  (prefered_lft != INFINITY_LIFE_TIME))
1873                 prefered_lft = 0x7FFFFFFF/HZ;
1874
1875         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1876
1877         if (!IS_ERR(ifp)) {
1878                 spin_lock_bh(&ifp->lock);
1879                 ifp->valid_lft = valid_lft;
1880                 ifp->prefered_lft = prefered_lft;
1881                 ifp->tstamp = jiffies;
1882                 spin_unlock_bh(&ifp->lock);
1883
1884                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1885                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1886                 addrconf_dad_start(ifp, 0);
1887                 in6_ifa_put(ifp);
1888                 addrconf_verify(0);
1889                 return 0;
1890         }
1891
1892         return PTR_ERR(ifp);
1893 }
1894
1895 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1896 {
1897         struct inet6_ifaddr *ifp;
1898         struct inet6_dev *idev;
1899         struct net_device *dev;
1900
1901         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1902                 return -ENODEV;
1903
1904         if ((idev = __in6_dev_get(dev)) == NULL)
1905                 return -ENXIO;
1906
1907         read_lock_bh(&idev->lock);
1908         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1909                 if (ifp->prefix_len == plen &&
1910                     ipv6_addr_equal(pfx, &ifp->addr)) {
1911                         in6_ifa_hold(ifp);
1912                         read_unlock_bh(&idev->lock);
1913
1914                         ipv6_del_addr(ifp);
1915
1916                         /* If the last address is deleted administratively,
1917                            disable IPv6 on this interface.
1918                          */
1919                         if (idev->addr_list == NULL)
1920                                 addrconf_ifdown(idev->dev, 1);
1921                         return 0;
1922                 }
1923         }
1924         read_unlock_bh(&idev->lock);
1925         return -EADDRNOTAVAIL;
1926 }
1927
1928
1929 int addrconf_add_ifaddr(void __user *arg)
1930 {
1931         struct in6_ifreq ireq;
1932         int err;
1933
1934         if (!capable(CAP_NET_ADMIN))
1935                 return -EPERM;
1936
1937         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1938                 return -EFAULT;
1939
1940         rtnl_lock();
1941         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1942                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1943         rtnl_unlock();
1944         return err;
1945 }
1946
1947 int addrconf_del_ifaddr(void __user *arg)
1948 {
1949         struct in6_ifreq ireq;
1950         int err;
1951
1952         if (!capable(CAP_NET_ADMIN))
1953                 return -EPERM;
1954
1955         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1956                 return -EFAULT;
1957
1958         rtnl_lock();
1959         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1960         rtnl_unlock();
1961         return err;
1962 }
1963
1964 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1965 static void sit_add_v4_addrs(struct inet6_dev *idev)
1966 {
1967         struct inet6_ifaddr * ifp;
1968         struct in6_addr addr;
1969         struct net_device *dev;
1970         int scope;
1971
1972         ASSERT_RTNL();
1973
1974         memset(&addr, 0, sizeof(struct in6_addr));
1975         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1976
1977         if (idev->dev->flags&IFF_POINTOPOINT) {
1978                 addr.s6_addr32[0] = htonl(0xfe800000);
1979                 scope = IFA_LINK;
1980         } else {
1981                 scope = IPV6_ADDR_COMPATv4;
1982         }
1983
1984         if (addr.s6_addr32[3]) {
1985                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1986                 if (!IS_ERR(ifp)) {
1987                         spin_lock_bh(&ifp->lock);
1988                         ifp->flags &= ~IFA_F_TENTATIVE;
1989                         spin_unlock_bh(&ifp->lock);
1990                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1991                         in6_ifa_put(ifp);
1992                 }
1993                 return;
1994         }
1995
1996         for (dev = dev_base; dev != NULL; dev = dev->next) {
1997                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1998                 if (in_dev && (dev->flags & IFF_UP)) {
1999                         struct in_ifaddr * ifa;
2000
2001                         int flag = scope;
2002
2003                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2004                                 int plen;
2005
2006                                 addr.s6_addr32[3] = ifa->ifa_local;
2007
2008                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2009                                         continue;
2010                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2011                                         if (idev->dev->flags&IFF_POINTOPOINT)
2012                                                 continue;
2013                                         flag |= IFA_HOST;
2014                                 }
2015                                 if (idev->dev->flags&IFF_POINTOPOINT)
2016                                         plen = 64;
2017                                 else
2018                                         plen = 96;
2019
2020                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2021                                                     IFA_F_PERMANENT);
2022                                 if (!IS_ERR(ifp)) {
2023                                         spin_lock_bh(&ifp->lock);
2024                                         ifp->flags &= ~IFA_F_TENTATIVE;
2025                                         spin_unlock_bh(&ifp->lock);
2026                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2027                                         in6_ifa_put(ifp);
2028                                 }
2029                         }
2030                 }
2031         }
2032 }
2033 #endif
2034
2035 static void init_loopback(struct net_device *dev)
2036 {
2037         struct inet6_dev  *idev;
2038         struct inet6_ifaddr * ifp;
2039
2040         /* ::1 */
2041
2042         ASSERT_RTNL();
2043
2044         if ((idev = ipv6_find_idev(dev)) == NULL) {
2045                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2046                 return;
2047         }
2048
2049         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2050         if (!IS_ERR(ifp)) {
2051                 spin_lock_bh(&ifp->lock);
2052                 ifp->flags &= ~IFA_F_TENTATIVE;
2053                 spin_unlock_bh(&ifp->lock);
2054                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2055                 in6_ifa_put(ifp);
2056         }
2057 }
2058
2059 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2060 {
2061         struct inet6_ifaddr * ifp;
2062
2063         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2064         if (!IS_ERR(ifp)) {
2065                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2066                 addrconf_dad_start(ifp, 0);
2067                 in6_ifa_put(ifp);
2068         }
2069 }
2070
2071 static void addrconf_dev_config(struct net_device *dev)
2072 {
2073         struct in6_addr addr;
2074         struct inet6_dev    * idev;
2075
2076         ASSERT_RTNL();
2077
2078         if ((dev->type != ARPHRD_ETHER) &&
2079             (dev->type != ARPHRD_FDDI) &&
2080             (dev->type != ARPHRD_IEEE802_TR) &&
2081             (dev->type != ARPHRD_ARCNET) &&
2082             (dev->type != ARPHRD_INFINIBAND)) {
2083                 /* Alas, we support only Ethernet autoconfiguration. */
2084                 return;
2085         }
2086
2087         idev = addrconf_add_dev(dev);
2088         if (idev == NULL)
2089                 return;
2090
2091         memset(&addr, 0, sizeof(struct in6_addr));
2092         addr.s6_addr32[0] = htonl(0xFE800000);
2093
2094         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2095                 addrconf_add_linklocal(idev, &addr);
2096 }
2097
2098 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2099 static void addrconf_sit_config(struct net_device *dev)
2100 {
2101         struct inet6_dev *idev;
2102
2103         ASSERT_RTNL();
2104
2105         /*
2106          * Configure the tunnel with one of our IPv4
2107          * addresses... we should configure all of
2108          * our v4 addrs in the tunnel
2109          */
2110
2111         if ((idev = ipv6_find_idev(dev)) == NULL) {
2112                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2113                 return;
2114         }
2115
2116         sit_add_v4_addrs(idev);
2117
2118         if (dev->flags&IFF_POINTOPOINT) {
2119                 addrconf_add_mroute(dev);
2120                 addrconf_add_lroute(dev);
2121         } else
2122                 sit_route_add(dev);
2123 }
2124 #endif
2125
2126 static inline int
2127 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2128 {
2129         struct in6_addr lladdr;
2130
2131         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2132                 addrconf_add_linklocal(idev, &lladdr);
2133                 return 0;
2134         }
2135         return -1;
2136 }
2137
2138 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2139 {
2140         struct net_device *link_dev;
2141
2142         /* first try to inherit the link-local address from the link device */
2143         if (idev->dev->iflink &&
2144             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2145                 if (!ipv6_inherit_linklocal(idev, link_dev))
2146                         return;
2147         }
2148         /* then try to inherit it from any device */
2149         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2150                 if (!ipv6_inherit_linklocal(idev, link_dev))
2151                         return;
2152         }
2153         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2154 }
2155
2156 /*
2157  * Autoconfigure tunnel with a link-local address so routing protocols,
2158  * DHCPv6, MLD etc. can be run over the virtual link
2159  */
2160
2161 static void addrconf_ip6_tnl_config(struct net_device *dev)
2162 {
2163         struct inet6_dev *idev;
2164
2165         ASSERT_RTNL();
2166
2167         if ((idev = addrconf_add_dev(dev)) == NULL) {
2168                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2169                 return;
2170         }
2171         ip6_tnl_add_linklocal(idev);
2172 }
2173
2174 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2175                            void * data)
2176 {
2177         struct net_device *dev = (struct net_device *) data;
2178         struct inet6_dev *idev = __in6_dev_get(dev);
2179         int run_pending = 0;
2180
2181         switch(event) {
2182         case NETDEV_REGISTER:
2183                 if (!idev) {
2184                         idev = ipv6_add_dev(dev);
2185                         if (!idev)
2186                                 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2187                                         dev->name);
2188                 }
2189                 break;
2190         case NETDEV_UP:
2191         case NETDEV_CHANGE:
2192                 if (event == NETDEV_UP) {
2193                         if (!netif_carrier_ok(dev)) {
2194                                 /* device is not ready yet. */
2195                                 printk(KERN_INFO
2196                                         "ADDRCONF(NETDEV_UP): %s: "
2197                                         "link is not ready\n",
2198                                         dev->name);
2199                                 break;
2200                         }
2201
2202                         if (idev)
2203                                 idev->if_flags |= IF_READY;
2204                 } else {
2205                         if (!netif_carrier_ok(dev)) {
2206                                 /* device is still not ready. */
2207                                 break;
2208                         }
2209
2210                         if (idev) {
2211                                 if (idev->if_flags & IF_READY) {
2212                                         /* device is already configured. */
2213                                         break;
2214                                 }
2215                                 idev->if_flags |= IF_READY;
2216                         }
2217
2218                         printk(KERN_INFO
2219                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2220                                         "link becomes ready\n",
2221                                         dev->name);
2222
2223                         run_pending = 1;
2224                 }
2225
2226                 switch(dev->type) {
2227 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2228                 case ARPHRD_SIT:
2229                         addrconf_sit_config(dev);
2230                         break;
2231 #endif
2232                 case ARPHRD_TUNNEL6:
2233                         addrconf_ip6_tnl_config(dev);
2234                         break;
2235                 case ARPHRD_LOOPBACK:
2236                         init_loopback(dev);
2237                         break;
2238
2239                 default:
2240                         addrconf_dev_config(dev);
2241                         break;
2242                 };
2243                 if (idev) {
2244                         if (run_pending)
2245                                 addrconf_dad_run(idev);
2246
2247                         /* If the MTU changed during the interface down, when the
2248                            interface up, the changed MTU must be reflected in the
2249                            idev as well as routers.
2250                          */
2251                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2252                                 rt6_mtu_change(dev, dev->mtu);
2253                                 idev->cnf.mtu6 = dev->mtu;
2254                         }
2255                         idev->tstamp = jiffies;
2256                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2257                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2258                            stop IPv6 on this interface.
2259                          */
2260                         if (dev->mtu < IPV6_MIN_MTU)
2261                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2262                 }
2263                 break;
2264
2265         case NETDEV_CHANGEMTU:
2266                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2267                         rt6_mtu_change(dev, dev->mtu);
2268                         idev->cnf.mtu6 = dev->mtu;
2269                         break;
2270                 }
2271
2272                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2273
2274         case NETDEV_DOWN:
2275         case NETDEV_UNREGISTER:
2276                 /*
2277                  *      Remove all addresses from this interface.
2278                  */
2279                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2280                 break;
2281
2282         case NETDEV_CHANGENAME:
2283 #ifdef CONFIG_SYSCTL
2284                 if (idev) {
2285                         addrconf_sysctl_unregister(&idev->cnf);
2286                         neigh_sysctl_unregister(idev->nd_parms);
2287                         neigh_sysctl_register(dev, idev->nd_parms,
2288                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2289                                               &ndisc_ifinfo_sysctl_change,
2290                                               NULL);
2291                         addrconf_sysctl_register(idev, &idev->cnf);
2292                 }
2293 #endif
2294                 break;
2295         };
2296
2297         return NOTIFY_OK;
2298 }
2299
2300 /*
2301  *      addrconf module should be notified of a device going up
2302  */
2303 static struct notifier_block ipv6_dev_notf = {
2304         .notifier_call = addrconf_notify,
2305         .priority = 0
2306 };
2307
2308 static int addrconf_ifdown(struct net_device *dev, int how)
2309 {
2310         struct inet6_dev *idev;
2311         struct inet6_ifaddr *ifa, **bifa;
2312         int i;
2313
2314         ASSERT_RTNL();
2315
2316         if (dev == &loopback_dev && how == 1)
2317                 how = 0;
2318
2319         rt6_ifdown(dev);
2320         neigh_ifdown(&nd_tbl, dev);
2321
2322         idev = __in6_dev_get(dev);
2323         if (idev == NULL)
2324                 return -ENODEV;
2325
2326         /* Step 1: remove reference to ipv6 device from parent device.
2327                    Do not dev_put!
2328          */
2329         if (how == 1) {
2330                 idev->dead = 1;
2331
2332                 /* protected by rtnl_lock */
2333                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2334
2335                 /* Step 1.5: remove snmp6 entry */
2336                 snmp6_unregister_dev(idev);
2337
2338         }
2339
2340         /* Step 2: clear hash table */
2341         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2342                 bifa = &inet6_addr_lst[i];
2343
2344                 write_lock_bh(&addrconf_hash_lock);
2345                 while ((ifa = *bifa) != NULL) {
2346                         if (ifa->idev == idev) {
2347                                 *bifa = ifa->lst_next;
2348                                 ifa->lst_next = NULL;
2349                                 addrconf_del_timer(ifa);
2350                                 in6_ifa_put(ifa);
2351                                 continue;
2352                         }
2353                         bifa = &ifa->lst_next;
2354                 }
2355                 write_unlock_bh(&addrconf_hash_lock);
2356         }
2357
2358         write_lock_bh(&idev->lock);
2359
2360         /* Step 3: clear flags for stateless addrconf */
2361         if (how != 1)
2362                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2363
2364         /* Step 4: clear address list */
2365 #ifdef CONFIG_IPV6_PRIVACY
2366         if (how == 1 && del_timer(&idev->regen_timer))
2367                 in6_dev_put(idev);
2368
2369         /* clear tempaddr list */
2370         while ((ifa = idev->tempaddr_list) != NULL) {
2371                 idev->tempaddr_list = ifa->tmp_next;
2372                 ifa->tmp_next = NULL;
2373                 ifa->dead = 1;
2374                 write_unlock_bh(&idev->lock);
2375                 spin_lock_bh(&ifa->lock);
2376
2377                 if (ifa->ifpub) {
2378                         in6_ifa_put(ifa->ifpub);
2379                         ifa->ifpub = NULL;
2380                 }
2381                 spin_unlock_bh(&ifa->lock);
2382                 in6_ifa_put(ifa);
2383                 write_lock_bh(&idev->lock);
2384         }
2385 #endif
2386         while ((ifa = idev->addr_list) != NULL) {
2387                 idev->addr_list = ifa->if_next;
2388                 ifa->if_next = NULL;
2389                 ifa->dead = 1;
2390                 addrconf_del_timer(ifa);
2391                 write_unlock_bh(&idev->lock);
2392
2393                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2394                 in6_ifa_put(ifa);
2395
2396                 write_lock_bh(&idev->lock);
2397         }
2398         write_unlock_bh(&idev->lock);
2399
2400         /* Step 5: Discard multicast list */
2401
2402         if (how == 1)
2403                 ipv6_mc_destroy_dev(idev);
2404         else
2405                 ipv6_mc_down(idev);
2406
2407         /* Step 5: netlink notification of this interface */
2408         idev->tstamp = jiffies;
2409         inet6_ifinfo_notify(RTM_DELLINK, idev);
2410
2411         /* Shot the device (if unregistered) */
2412
2413         if (how == 1) {
2414 #ifdef CONFIG_SYSCTL
2415                 addrconf_sysctl_unregister(&idev->cnf);
2416                 neigh_sysctl_unregister(idev->nd_parms);
2417 #endif
2418                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2419                 neigh_ifdown(&nd_tbl, dev);
2420                 in6_dev_put(idev);
2421         }
2422         return 0;
2423 }
2424
2425 static void addrconf_rs_timer(unsigned long data)
2426 {
2427         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2428
2429         if (ifp->idev->cnf.forwarding)
2430                 goto out;
2431
2432         if (ifp->idev->if_flags & IF_RA_RCVD) {
2433                 /*
2434                  *      Announcement received after solicitation
2435                  *      was sent
2436                  */
2437                 goto out;
2438         }
2439
2440         spin_lock(&ifp->lock);
2441         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2442                 struct in6_addr all_routers;
2443
2444                 /* The wait after the last probe can be shorter */
2445                 addrconf_mod_timer(ifp, AC_RS,
2446                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2447                                    ifp->idev->cnf.rtr_solicit_delay :
2448                                    ifp->idev->cnf.rtr_solicit_interval);
2449                 spin_unlock(&ifp->lock);
2450
2451                 ipv6_addr_all_routers(&all_routers);
2452
2453                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2454         } else {
2455                 spin_unlock(&ifp->lock);
2456                 /*
2457                  * Note: we do not support deprecated "all on-link"
2458                  * assumption any longer.
2459                  */
2460                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2461                        ifp->idev->dev->name);
2462         }
2463
2464 out:
2465         in6_ifa_put(ifp);
2466 }
2467
2468 /*
2469  *      Duplicate Address Detection
2470  */
2471 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2472 {
2473         unsigned long rand_num;
2474         struct inet6_dev *idev = ifp->idev;
2475
2476         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2477         ifp->probes = idev->cnf.dad_transmits;
2478         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2479 }
2480
2481 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2482 {
2483         struct inet6_dev *idev = ifp->idev;
2484         struct net_device *dev = idev->dev;
2485
2486         addrconf_join_solict(dev, &ifp->addr);
2487
2488         net_srandom(ifp->addr.s6_addr32[3]);
2489
2490         read_lock_bh(&idev->lock);
2491         if (ifp->dead)
2492                 goto out;
2493         spin_lock_bh(&ifp->lock);
2494
2495         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2496             !(ifp->flags&IFA_F_TENTATIVE) ||
2497             ifp->flags & IFA_F_NODAD) {
2498                 ifp->flags &= ~IFA_F_TENTATIVE;
2499                 spin_unlock_bh(&ifp->lock);
2500                 read_unlock_bh(&idev->lock);
2501
2502                 addrconf_dad_completed(ifp);
2503                 return;
2504         }
2505
2506         if (!(idev->if_flags & IF_READY)) {
2507                 spin_unlock_bh(&ifp->lock);
2508                 read_unlock_bh(&idev->lock);
2509                 /*
2510                  * If the defice is not ready:
2511                  * - keep it tentative if it is a permanent address.
2512                  * - otherwise, kill it.
2513                  */
2514                 in6_ifa_hold(ifp);
2515                 addrconf_dad_stop(ifp);
2516                 return;
2517         }
2518         addrconf_dad_kick(ifp);
2519         spin_unlock_bh(&ifp->lock);
2520 out:
2521         read_unlock_bh(&idev->lock);
2522 }
2523
2524 static void addrconf_dad_timer(unsigned long data)
2525 {
2526         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2527         struct inet6_dev *idev = ifp->idev;
2528         struct in6_addr unspec;
2529         struct in6_addr mcaddr;
2530
2531         read_lock_bh(&idev->lock);
2532         if (idev->dead) {
2533                 read_unlock_bh(&idev->lock);
2534                 goto out;
2535         }
2536         spin_lock_bh(&ifp->lock);
2537         if (ifp->probes == 0) {
2538                 /*
2539                  * DAD was successful
2540                  */
2541
2542                 ifp->flags &= ~IFA_F_TENTATIVE;
2543                 spin_unlock_bh(&ifp->lock);
2544                 read_unlock_bh(&idev->lock);
2545
2546                 addrconf_dad_completed(ifp);
2547
2548                 goto out;
2549         }
2550
2551         ifp->probes--;
2552         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2553         spin_unlock_bh(&ifp->lock);
2554         read_unlock_bh(&idev->lock);
2555
2556         /* send a neighbour solicitation for our addr */
2557         memset(&unspec, 0, sizeof(unspec));
2558         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2559         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2560 out:
2561         in6_ifa_put(ifp);
2562 }
2563
2564 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2565 {
2566         struct net_device *     dev = ifp->idev->dev;
2567
2568         /*
2569          *      Configure the address for reception. Now it is valid.
2570          */
2571
2572         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2573
2574         /* If added prefix is link local and forwarding is off,
2575            start sending router solicitations.
2576          */
2577
2578         if (ifp->idev->cnf.forwarding == 0 &&
2579             ifp->idev->cnf.rtr_solicits > 0 &&
2580             (dev->flags&IFF_LOOPBACK) == 0 &&
2581             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2582                 struct in6_addr all_routers;
2583
2584                 ipv6_addr_all_routers(&all_routers);
2585
2586                 /*
2587                  *      If a host as already performed a random delay
2588                  *      [...] as part of DAD [...] there is no need
2589                  *      to delay again before sending the first RS
2590                  */
2591                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2592
2593                 spin_lock_bh(&ifp->lock);
2594                 ifp->probes = 1;
2595                 ifp->idev->if_flags |= IF_RS_SENT;
2596                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2597                 spin_unlock_bh(&ifp->lock);
2598         }
2599 }
2600
2601 static void addrconf_dad_run(struct inet6_dev *idev) {
2602         struct inet6_ifaddr *ifp;
2603
2604         read_lock_bh(&idev->lock);
2605         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2606                 spin_lock_bh(&ifp->lock);
2607                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2608                         spin_unlock_bh(&ifp->lock);
2609                         continue;
2610                 }
2611                 spin_unlock_bh(&ifp->lock);
2612                 addrconf_dad_kick(ifp);
2613         }
2614         read_unlock_bh(&idev->lock);
2615 }
2616
2617 #ifdef CONFIG_PROC_FS
2618 struct if6_iter_state {
2619         int bucket;
2620 };
2621
2622 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2623 {
2624         struct inet6_ifaddr *ifa = NULL;
2625         struct if6_iter_state *state = seq->private;
2626
2627         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2628                 ifa = inet6_addr_lst[state->bucket];
2629                 if (ifa)
2630                         break;
2631         }
2632         return ifa;
2633 }
2634
2635 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2636 {
2637         struct if6_iter_state *state = seq->private;
2638
2639         ifa = ifa->lst_next;
2640 try_again:
2641         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2642                 ifa = inet6_addr_lst[state->bucket];
2643                 goto try_again;
2644         }
2645         return ifa;
2646 }
2647
2648 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2649 {
2650         struct inet6_ifaddr *ifa = if6_get_first(seq);
2651
2652         if (ifa)
2653                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2654                         --pos;
2655         return pos ? NULL : ifa;
2656 }
2657
2658 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2659 {
2660         read_lock_bh(&addrconf_hash_lock);
2661         return if6_get_idx(seq, *pos);
2662 }
2663
2664 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2665 {
2666         struct inet6_ifaddr *ifa;
2667
2668         ifa = if6_get_next(seq, v);
2669         ++*pos;
2670         return ifa;
2671 }
2672
2673 static void if6_seq_stop(struct seq_file *seq, void *v)
2674 {
2675         read_unlock_bh(&addrconf_hash_lock);
2676 }
2677
2678 static int if6_seq_show(struct seq_file *seq, void *v)
2679 {
2680         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2681         seq_printf(seq,
2682                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2683                    NIP6(ifp->addr),
2684                    ifp->idev->dev->ifindex,
2685                    ifp->prefix_len,
2686                    ifp->scope,
2687                    ifp->flags,
2688                    ifp->idev->dev->name);
2689         return 0;
2690 }
2691
2692 static struct seq_operations if6_seq_ops = {
2693         .start  = if6_seq_start,
2694         .next   = if6_seq_next,
2695         .show   = if6_seq_show,
2696         .stop   = if6_seq_stop,
2697 };
2698
2699 static int if6_seq_open(struct inode *inode, struct file *file)
2700 {
2701         struct seq_file *seq;
2702         int rc = -ENOMEM;
2703         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2704
2705         if (!s)
2706                 goto out;
2707
2708         rc = seq_open(file, &if6_seq_ops);
2709         if (rc)
2710                 goto out_kfree;
2711
2712         seq = file->private_data;
2713         seq->private = s;
2714 out:
2715         return rc;
2716 out_kfree:
2717         kfree(s);
2718         goto out;
2719 }
2720
2721 static const struct file_operations if6_fops = {
2722         .owner          = THIS_MODULE,
2723         .open           = if6_seq_open,
2724         .read           = seq_read,
2725         .llseek         = seq_lseek,
2726         .release        = seq_release_private,
2727 };
2728
2729 int __init if6_proc_init(void)
2730 {
2731         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2732                 return -ENOMEM;
2733         return 0;
2734 }
2735
2736 void if6_proc_exit(void)
2737 {
2738         proc_net_remove("if_inet6");
2739 }
2740 #endif  /* CONFIG_PROC_FS */
2741
2742 #ifdef CONFIG_IPV6_MIP6
2743 /* Check if address is a home address configured on any interface. */
2744 int ipv6_chk_home_addr(struct in6_addr *addr)
2745 {
2746         int ret = 0;
2747         struct inet6_ifaddr * ifp;
2748         u8 hash = ipv6_addr_hash(addr);
2749         read_lock_bh(&addrconf_hash_lock);
2750         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2751                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2752                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2753                         ret = 1;
2754                         break;
2755                 }
2756         }
2757         read_unlock_bh(&addrconf_hash_lock);
2758         return ret;
2759 }
2760 #endif
2761
2762 /*
2763  *      Periodic address status verification
2764  */
2765
2766 static void addrconf_verify(unsigned long foo)
2767 {
2768         struct inet6_ifaddr *ifp;
2769         unsigned long now, next;
2770         int i;
2771
2772         spin_lock_bh(&addrconf_verify_lock);
2773         now = jiffies;
2774         next = now + ADDR_CHECK_FREQUENCY;
2775
2776         del_timer(&addr_chk_timer);
2777
2778         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2779
2780 restart:
2781                 read_lock(&addrconf_hash_lock);
2782                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2783                         unsigned long age;
2784 #ifdef CONFIG_IPV6_PRIVACY
2785                         unsigned long regen_advance;
2786 #endif
2787
2788                         if (ifp->flags & IFA_F_PERMANENT)
2789                                 continue;
2790
2791                         spin_lock(&ifp->lock);
2792                         age = (now - ifp->tstamp) / HZ;
2793
2794 #ifdef CONFIG_IPV6_PRIVACY
2795                         regen_advance = ifp->idev->cnf.regen_max_retry *
2796                                         ifp->idev->cnf.dad_transmits *
2797                                         ifp->idev->nd_parms->retrans_time / HZ;
2798 #endif
2799
2800                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2801                             age >= ifp->valid_lft) {
2802                                 spin_unlock(&ifp->lock);
2803                                 in6_ifa_hold(ifp);
2804                                 read_unlock(&addrconf_hash_lock);
2805                                 ipv6_del_addr(ifp);
2806                                 goto restart;
2807                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2808                                 spin_unlock(&ifp->lock);
2809                                 continue;
2810                         } else if (age >= ifp->prefered_lft) {
2811                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2812                                 int deprecate = 0;
2813
2814                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2815                                         deprecate = 1;
2816                                         ifp->flags |= IFA_F_DEPRECATED;
2817                                 }
2818
2819                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2820                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2821
2822                                 spin_unlock(&ifp->lock);
2823
2824                                 if (deprecate) {
2825                                         in6_ifa_hold(ifp);
2826                                         read_unlock(&addrconf_hash_lock);
2827
2828                                         ipv6_ifa_notify(0, ifp);
2829                                         in6_ifa_put(ifp);
2830                                         goto restart;
2831                                 }
2832 #ifdef CONFIG_IPV6_PRIVACY
2833                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2834                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2835                                 if (age >= ifp->prefered_lft - regen_advance) {
2836                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2837                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2838                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2839                                         if (!ifp->regen_count && ifpub) {
2840                                                 ifp->regen_count++;
2841                                                 in6_ifa_hold(ifp);
2842                                                 in6_ifa_hold(ifpub);
2843                                                 spin_unlock(&ifp->lock);
2844                                                 read_unlock(&addrconf_hash_lock);
2845                                                 spin_lock(&ifpub->lock);
2846                                                 ifpub->regen_count = 0;
2847                                                 spin_unlock(&ifpub->lock);
2848                                                 ipv6_create_tempaddr(ifpub, ifp);
2849                                                 in6_ifa_put(ifpub);
2850                                                 in6_ifa_put(ifp);
2851                                                 goto restart;
2852                                         }
2853                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2854                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2855                                 spin_unlock(&ifp->lock);
2856 #endif
2857                         } else {
2858                                 /* ifp->prefered_lft <= ifp->valid_lft */
2859                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2860                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2861                                 spin_unlock(&ifp->lock);
2862                         }
2863                 }
2864                 read_unlock(&addrconf_hash_lock);
2865         }
2866
2867         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2868         add_timer(&addr_chk_timer);
2869         spin_unlock_bh(&addrconf_verify_lock);
2870 }
2871
2872 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2873 {
2874         struct in6_addr *pfx = NULL;
2875
2876         if (addr)
2877                 pfx = nla_data(addr);
2878
2879         if (local) {
2880                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2881                         pfx = NULL;
2882                 else
2883                         pfx = nla_data(local);
2884         }
2885
2886         return pfx;
2887 }
2888
2889 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2890         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2891         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2892         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2893 };
2894
2895 static int
2896 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2897 {
2898         struct ifaddrmsg *ifm;
2899         struct nlattr *tb[IFA_MAX+1];
2900         struct in6_addr *pfx;
2901         int err;
2902
2903         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2904         if (err < 0)
2905                 return err;
2906
2907         ifm = nlmsg_data(nlh);
2908         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2909         if (pfx == NULL)
2910                 return -EINVAL;
2911
2912         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2913 }
2914
2915 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2916                              u32 prefered_lft, u32 valid_lft)
2917 {
2918         u32 flags = RTF_EXPIRES;
2919
2920         if (!valid_lft || (prefered_lft > valid_lft))
2921                 return -EINVAL;
2922
2923         if (valid_lft == INFINITY_LIFE_TIME) {
2924                 ifa_flags |= IFA_F_PERMANENT;
2925                 flags = 0;
2926         } else if (valid_lft >= 0x7FFFFFFF/HZ)
2927                 valid_lft = 0x7FFFFFFF/HZ;
2928
2929         if (prefered_lft == 0)
2930                 ifa_flags |= IFA_F_DEPRECATED;
2931         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2932                  (prefered_lft != INFINITY_LIFE_TIME))
2933                 prefered_lft = 0x7FFFFFFF/HZ;
2934
2935         spin_lock_bh(&ifp->lock);
2936         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
2937         ifp->tstamp = jiffies;
2938         ifp->valid_lft = valid_lft;
2939         ifp->prefered_lft = prefered_lft;
2940
2941         spin_unlock_bh(&ifp->lock);
2942         if (!(ifp->flags&IFA_F_TENTATIVE))
2943                 ipv6_ifa_notify(0, ifp);
2944
2945         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
2946                               jiffies_to_clock_t(valid_lft * HZ), flags);
2947         addrconf_verify(0);
2948
2949         return 0;
2950 }
2951
2952 static int
2953 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2954 {
2955         struct ifaddrmsg *ifm;
2956         struct nlattr *tb[IFA_MAX+1];
2957         struct in6_addr *pfx;
2958         struct inet6_ifaddr *ifa;
2959         struct net_device *dev;
2960         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
2961         u8 ifa_flags;
2962         int err;
2963
2964         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2965         if (err < 0)
2966                 return err;
2967
2968         ifm = nlmsg_data(nlh);
2969         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2970         if (pfx == NULL)
2971                 return -EINVAL;
2972
2973         if (tb[IFA_CACHEINFO]) {
2974                 struct ifa_cacheinfo *ci;
2975
2976                 ci = nla_data(tb[IFA_CACHEINFO]);
2977                 valid_lft = ci->ifa_valid;
2978                 preferred_lft = ci->ifa_prefered;
2979         } else {
2980                 preferred_lft = INFINITY_LIFE_TIME;
2981                 valid_lft = INFINITY_LIFE_TIME;
2982         }
2983
2984         dev =  __dev_get_by_index(ifm->ifa_index);
2985         if (dev == NULL)
2986                 return -ENODEV;
2987
2988         /* We ignore other flags so far. */
2989         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
2990
2991         ifa = ipv6_get_ifaddr(pfx, dev, 1);
2992         if (ifa == NULL) {
2993                 /*
2994                  * It would be best to check for !NLM_F_CREATE here but
2995                  * userspace alreay relies on not having to provide this.
2996                  */
2997                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
2998                                       ifa_flags, preferred_lft, valid_lft);
2999         }
3000
3001         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3002             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3003                 err = -EEXIST;
3004         else
3005                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3006
3007         in6_ifa_put(ifa);
3008
3009         return err;
3010 }
3011
3012 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3013                           u8 scope, int ifindex)
3014 {
3015         struct ifaddrmsg *ifm;
3016
3017         ifm = nlmsg_data(nlh);
3018         ifm->ifa_family = AF_INET6;
3019         ifm->ifa_prefixlen = prefixlen;
3020         ifm->ifa_flags = flags;
3021         ifm->ifa_scope = scope;
3022         ifm->ifa_index = ifindex;
3023 }
3024
3025 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3026                          unsigned long tstamp, u32 preferred, u32 valid)
3027 {
3028         struct ifa_cacheinfo ci;
3029
3030         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3031                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3032         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3033                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3034         ci.ifa_prefered = preferred;
3035         ci.ifa_valid = valid;
3036
3037         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3038 }
3039
3040 static inline int rt_scope(int ifa_scope)
3041 {
3042         if (ifa_scope & IFA_HOST)
3043                 return RT_SCOPE_HOST;
3044         else if (ifa_scope & IFA_LINK)
3045                 return RT_SCOPE_LINK;
3046         else if (ifa_scope & IFA_SITE)
3047                 return RT_SCOPE_SITE;
3048         else
3049                 return RT_SCOPE_UNIVERSE;
3050 }
3051
3052 static inline int inet6_ifaddr_msgsize(void)
3053 {
3054         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3055                + nla_total_size(16) /* IFA_ADDRESS */
3056                + nla_total_size(sizeof(struct ifa_cacheinfo));
3057 }
3058
3059 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3060                              u32 pid, u32 seq, int event, unsigned int flags)
3061 {
3062         struct nlmsghdr  *nlh;
3063         u32 preferred, valid;
3064
3065         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3066         if (nlh == NULL)
3067                 return -EMSGSIZE;
3068
3069         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3070                       ifa->idev->dev->ifindex);
3071
3072         if (!(ifa->flags&IFA_F_PERMANENT)) {
3073                 preferred = ifa->prefered_lft;
3074                 valid = ifa->valid_lft;
3075                 if (preferred != INFINITY_LIFE_TIME) {
3076                         long tval = (jiffies - ifa->tstamp)/HZ;
3077                         preferred -= tval;
3078                         if (valid != INFINITY_LIFE_TIME)
3079                                 valid -= tval;
3080                 }
3081         } else {
3082                 preferred = INFINITY_LIFE_TIME;
3083                 valid = INFINITY_LIFE_TIME;
3084         }
3085
3086         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3087             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3088                 nlmsg_cancel(skb, nlh);
3089                 return -EMSGSIZE;
3090         }
3091
3092         return nlmsg_end(skb, nlh);
3093 }
3094
3095 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3096                                 u32 pid, u32 seq, int event, u16 flags)
3097 {
3098         struct nlmsghdr  *nlh;
3099         u8 scope = RT_SCOPE_UNIVERSE;
3100         int ifindex = ifmca->idev->dev->ifindex;
3101
3102         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3103                 scope = RT_SCOPE_SITE;
3104
3105         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3106         if (nlh == NULL)
3107                 return -EMSGSIZE;
3108
3109         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3110         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3111             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3112                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3113                 nlmsg_cancel(skb, nlh);
3114                 return -EMSGSIZE;
3115         }
3116
3117         return nlmsg_end(skb, nlh);
3118 }
3119
3120 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3121                                 u32 pid, u32 seq, int event, unsigned int flags)
3122 {
3123         struct nlmsghdr  *nlh;
3124         u8 scope = RT_SCOPE_UNIVERSE;
3125         int ifindex = ifaca->aca_idev->dev->ifindex;
3126
3127         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3128                 scope = RT_SCOPE_SITE;
3129
3130         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3131         if (nlh == NULL)
3132                 return -EMSGSIZE;
3133
3134         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3135         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3136             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3137                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3138                 nlmsg_cancel(skb, nlh);
3139                 return -EMSGSIZE;
3140         }
3141
3142         return nlmsg_end(skb, nlh);
3143 }
3144
3145 enum addr_type_t
3146 {
3147         UNICAST_ADDR,
3148         MULTICAST_ADDR,
3149         ANYCAST_ADDR,
3150 };
3151
3152 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3153                            enum addr_type_t type)
3154 {
3155         int idx, ip_idx;
3156         int s_idx, s_ip_idx;
3157         int err = 1;
3158         struct net_device *dev;
3159         struct inet6_dev *idev = NULL;
3160         struct inet6_ifaddr *ifa;
3161         struct ifmcaddr6 *ifmca;
3162         struct ifacaddr6 *ifaca;
3163
3164         s_idx = cb->args[0];
3165         s_ip_idx = ip_idx = cb->args[1];
3166         read_lock(&dev_base_lock);
3167
3168         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3169                 if (idx < s_idx)
3170                         continue;
3171                 if (idx > s_idx)
3172                         s_ip_idx = 0;
3173                 ip_idx = 0;
3174                 if ((idev = in6_dev_get(dev)) == NULL)
3175                         continue;
3176                 read_lock_bh(&idev->lock);
3177                 switch (type) {
3178                 case UNICAST_ADDR:
3179                         /* unicast address incl. temp addr */
3180                         for (ifa = idev->addr_list; ifa;
3181                              ifa = ifa->if_next, ip_idx++) {
3182                                 if (ip_idx < s_ip_idx)
3183                                         continue;
3184                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3185                                     NETLINK_CB(cb->skb).pid,
3186                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3187                                     NLM_F_MULTI)) <= 0)
3188                                         goto done;
3189                         }
3190                         break;
3191                 case MULTICAST_ADDR:
3192                         /* multicast address */
3193                         for (ifmca = idev->mc_list; ifmca;
3194                              ifmca = ifmca->next, ip_idx++) {
3195                                 if (ip_idx < s_ip_idx)
3196                                         continue;
3197                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3198                                     NETLINK_CB(cb->skb).pid,
3199                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3200                                     NLM_F_MULTI)) <= 0)
3201                                         goto done;
3202                         }
3203                         break;
3204                 case ANYCAST_ADDR:
3205                         /* anycast address */
3206                         for (ifaca = idev->ac_list; ifaca;
3207                              ifaca = ifaca->aca_next, ip_idx++) {
3208                                 if (ip_idx < s_ip_idx)
3209                                         continue;
3210                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3211                                     NETLINK_CB(cb->skb).pid,
3212                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3213                                     NLM_F_MULTI)) <= 0)
3214                                         goto done;
3215                         }
3216                         break;
3217                 default:
3218                         break;
3219                 }
3220                 read_unlock_bh(&idev->lock);
3221                 in6_dev_put(idev);
3222         }
3223 done:
3224         if (err <= 0) {
3225                 read_unlock_bh(&idev->lock);
3226                 in6_dev_put(idev);
3227         }
3228         read_unlock(&dev_base_lock);
3229         cb->args[0] = idx;
3230         cb->args[1] = ip_idx;
3231         return skb->len;
3232 }
3233
3234 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3235 {
3236         enum addr_type_t type = UNICAST_ADDR;
3237         return inet6_dump_addr(skb, cb, type);
3238 }
3239
3240 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3241 {
3242         enum addr_type_t type = MULTICAST_ADDR;
3243         return inet6_dump_addr(skb, cb, type);
3244 }
3245
3246
3247 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3248 {
3249         enum addr_type_t type = ANYCAST_ADDR;
3250         return inet6_dump_addr(skb, cb, type);
3251 }
3252
3253 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3254                              void *arg)
3255 {
3256         struct ifaddrmsg *ifm;
3257         struct nlattr *tb[IFA_MAX+1];
3258         struct in6_addr *addr = NULL;
3259         struct net_device *dev = NULL;
3260         struct inet6_ifaddr *ifa;
3261         struct sk_buff *skb;
3262         int err;
3263
3264         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3265         if (err < 0)
3266                 goto errout;
3267
3268         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3269         if (addr == NULL) {
3270                 err = -EINVAL;
3271                 goto errout;
3272         }
3273
3274         ifm = nlmsg_data(nlh);
3275         if (ifm->ifa_index)
3276                 dev = __dev_get_by_index(ifm->ifa_index);
3277
3278         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3279                 err = -EADDRNOTAVAIL;
3280                 goto errout;
3281         }
3282
3283         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3284                 err = -ENOBUFS;
3285                 goto errout_ifa;
3286         }
3287
3288         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3289                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3290         if (err < 0) {
3291                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3292                 WARN_ON(err == -EMSGSIZE);
3293                 kfree_skb(skb);
3294                 goto errout_ifa;
3295         }
3296         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3297 errout_ifa:
3298         in6_ifa_put(ifa);
3299 errout:
3300         return err;
3301 }
3302
3303 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3304 {
3305         struct sk_buff *skb;
3306         int err = -ENOBUFS;
3307
3308         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3309         if (skb == NULL)
3310                 goto errout;
3311
3312         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3313         if (err < 0) {
3314                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3315                 WARN_ON(err == -EMSGSIZE);
3316                 kfree_skb(skb);
3317                 goto errout;
3318         }
3319         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3320 errout:
3321         if (err < 0)
3322                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3323 }
3324
3325 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3326                                 __s32 *array, int bytes)
3327 {
3328         BUG_ON(bytes < (DEVCONF_MAX * 4));
3329
3330         memset(array, 0, bytes);
3331         array[DEVCONF_FORWARDING] = cnf->forwarding;
3332         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3333         array[DEVCONF_MTU6] = cnf->mtu6;
3334         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3335         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3336         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3337         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3338         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3339         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3340         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3341         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3342 #ifdef CONFIG_IPV6_PRIVACY
3343         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3344         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3345         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3346         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3347         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3348 #endif
3349         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3350         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3351         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3352 #ifdef CONFIG_IPV6_ROUTER_PREF
3353         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3354         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3355 #ifdef CONFIG_IPV6_ROUTE_INFO
3356         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3357 #endif
3358 #endif
3359         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3360 }
3361
3362 static inline size_t inet6_if_nlmsg_size(void)
3363 {
3364         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3365                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3366                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3367                + nla_total_size(4) /* IFLA_MTU */
3368                + nla_total_size(4) /* IFLA_LINK */
3369                + nla_total_size( /* IFLA_PROTINFO */
3370                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3371                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3372                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3373                  );
3374 }
3375
3376 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3377                              u32 pid, u32 seq, int event, unsigned int flags)
3378 {
3379         struct net_device *dev = idev->dev;
3380         struct nlattr *conf;
3381         struct ifinfomsg *hdr;
3382         struct nlmsghdr *nlh;
3383         void *protoinfo;
3384         struct ifla_cacheinfo ci;
3385
3386         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3387         if (nlh == NULL)
3388                 return -EMSGSIZE;
3389
3390         hdr = nlmsg_data(nlh);
3391         hdr->ifi_family = AF_INET6;
3392         hdr->__ifi_pad = 0;
3393         hdr->ifi_type = dev->type;
3394         hdr->ifi_index = dev->ifindex;
3395         hdr->ifi_flags = dev_get_flags(dev);
3396         hdr->ifi_change = 0;
3397
3398         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3399
3400         if (dev->addr_len)
3401                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3402
3403         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3404         if (dev->ifindex != dev->iflink)
3405                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3406
3407         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3408         if (protoinfo == NULL)
3409                 goto nla_put_failure;
3410
3411         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3412
3413         ci.max_reasm_len = IPV6_MAXPLEN;
3414         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3415                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3416         ci.reachable_time = idev->nd_parms->reachable_time;
3417         ci.retrans_time = idev->nd_parms->retrans_time;
3418         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3419
3420         conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3421         if (conf == NULL)
3422                 goto nla_put_failure;
3423         ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
3424
3425         /* XXX - Statistics/MC not implemented */
3426
3427         nla_nest_end(skb, protoinfo);
3428         return nlmsg_end(skb, nlh);
3429
3430 nla_put_failure:
3431         nlmsg_cancel(skb, nlh);
3432         return -EMSGSIZE;
3433 }
3434
3435 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3436 {
3437         int idx, err;
3438         int s_idx = cb->args[0];
3439         struct net_device *dev;
3440         struct inet6_dev *idev;
3441
3442         read_lock(&dev_base_lock);
3443         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3444                 if (idx < s_idx)
3445                         continue;
3446                 if ((idev = in6_dev_get(dev)) == NULL)
3447                         continue;
3448                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3449                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3450                 in6_dev_put(idev);
3451                 if (err <= 0)
3452                         break;
3453         }
3454         read_unlock(&dev_base_lock);
3455         cb->args[0] = idx;
3456
3457         return skb->len;
3458 }
3459
3460 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3461 {
3462         struct sk_buff *skb;
3463         int err = -ENOBUFS;
3464
3465         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3466         if (skb == NULL)
3467                 goto errout;
3468
3469         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3470         if (err < 0) {
3471                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3472                 WARN_ON(err == -EMSGSIZE);
3473                 kfree_skb(skb);
3474                 goto errout;
3475         }
3476         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3477 errout:
3478         if (err < 0)
3479                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3480 }
3481
3482 static inline size_t inet6_prefix_nlmsg_size(void)
3483 {
3484         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3485                + nla_total_size(sizeof(struct in6_addr))
3486                + nla_total_size(sizeof(struct prefix_cacheinfo));
3487 }
3488
3489 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3490                              struct prefix_info *pinfo, u32 pid, u32 seq,
3491                              int event, unsigned int flags)
3492 {
3493         struct prefixmsg *pmsg;
3494         struct nlmsghdr *nlh;
3495         struct prefix_cacheinfo ci;
3496
3497         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3498         if (nlh == NULL)
3499                 return -EMSGSIZE;
3500
3501         pmsg = nlmsg_data(nlh);
3502         pmsg->prefix_family = AF_INET6;
3503         pmsg->prefix_pad1 = 0;
3504         pmsg->prefix_pad2 = 0;
3505         pmsg->prefix_ifindex = idev->dev->ifindex;
3506         pmsg->prefix_len = pinfo->prefix_len;
3507         pmsg->prefix_type = pinfo->type;
3508         pmsg->prefix_pad3 = 0;
3509         pmsg->prefix_flags = 0;
3510         if (pinfo->onlink)
3511                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3512         if (pinfo->autoconf)
3513                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3514
3515         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3516
3517         ci.preferred_time = ntohl(pinfo->prefered);
3518         ci.valid_time = ntohl(pinfo->valid);
3519         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3520
3521         return nlmsg_end(skb, nlh);
3522
3523 nla_put_failure:
3524         nlmsg_cancel(skb, nlh);
3525         return -EMSGSIZE;
3526 }
3527
3528 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3529                          struct prefix_info *pinfo)
3530 {
3531         struct sk_buff *skb;
3532         int err = -ENOBUFS;
3533
3534         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3535         if (skb == NULL)
3536                 goto errout;
3537
3538         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3539         if (err < 0) {
3540                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3541                 WARN_ON(err == -EMSGSIZE);
3542                 kfree_skb(skb);
3543                 goto errout;
3544         }
3545         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3546 errout:
3547         if (err < 0)
3548                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3549 }
3550
3551 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3552         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3553         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3554         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3555         [RTM_GETADDR - RTM_BASE] = { .doit      = inet6_rtm_getaddr,
3556                                      .dumpit    = inet6_dump_ifaddr, },
3557         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3558         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3559         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3560         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3561         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3562                                       .dumpit   = inet6_dump_fib, },
3563 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3564         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = fib6_rules_dump,   },
3565 #endif
3566 };
3567
3568 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3569 {
3570         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3571
3572         switch (event) {
3573         case RTM_NEWADDR:
3574                 ip6_ins_rt(ifp->rt);
3575                 if (ifp->idev->cnf.forwarding)
3576                         addrconf_join_anycast(ifp);
3577                 break;
3578         case RTM_DELADDR:
3579                 if (ifp->idev->cnf.forwarding)
3580                         addrconf_leave_anycast(ifp);
3581                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3582                 dst_hold(&ifp->rt->u.dst);
3583                 if (ip6_del_rt(ifp->rt))
3584                         dst_free(&ifp->rt->u.dst);
3585                 break;
3586         }
3587 }
3588
3589 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3590 {
3591         rcu_read_lock_bh();
3592         if (likely(ifp->idev->dead == 0))
3593                 __ipv6_ifa_notify(event, ifp);
3594         rcu_read_unlock_bh();
3595 }
3596
3597 #ifdef CONFIG_SYSCTL
3598
3599 static
3600 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3601                            void __user *buffer, size_t *lenp, loff_t *ppos)
3602 {
3603         int *valp = ctl->data;
3604         int val = *valp;
3605         int ret;
3606
3607         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3608
3609         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3610                 if (valp != &ipv6_devconf.forwarding) {
3611                         if ((!*valp) ^ (!val)) {
3612                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3613                                 if (idev == NULL)
3614                                         return ret;
3615                                 dev_forward_change(idev);
3616                         }
3617                 } else {
3618                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3619                         addrconf_forward_change();
3620                 }
3621                 if (*valp)
3622                         rt6_purge_dflt_routers();
3623         }
3624
3625         return ret;
3626 }
3627
3628 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3629                                             int __user *name, int nlen,
3630                                             void __user *oldval,
3631                                             size_t __user *oldlenp,
3632                                             void __user *newval, size_t newlen)
3633 {
3634         int *valp = table->data;
3635         int new;
3636
3637         if (!newval || !newlen)
3638                 return 0;
3639         if (newlen != sizeof(int))
3640                 return -EINVAL;
3641         if (get_user(new, (int __user *)newval))
3642                 return -EFAULT;
3643         if (new == *valp)
3644                 return 0;
3645         if (oldval && oldlenp) {
3646                 size_t len;
3647                 if (get_user(len, oldlenp))
3648                         return -EFAULT;
3649                 if (len) {
3650                         if (len > table->maxlen)
3651                                 len = table->maxlen;
3652                         if (copy_to_user(oldval, valp, len))
3653                                 return -EFAULT;
3654                         if (put_user(len, oldlenp))
3655                                 return -EFAULT;
3656                 }
3657         }
3658
3659         if (valp != &ipv6_devconf_dflt.forwarding) {
3660                 if (valp != &ipv6_devconf.forwarding) {
3661                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3662                         int changed;
3663                         if (unlikely(idev == NULL))
3664                                 return -ENODEV;
3665                         changed = (!*valp) ^ (!new);
3666                         *valp = new;
3667                         if (changed)
3668                                 dev_forward_change(idev);
3669                 } else {
3670                         *valp = new;
3671                         addrconf_forward_change();
3672                 }
3673
3674                 if (*valp)
3675                         rt6_purge_dflt_routers();
3676         } else
3677                 *valp = new;
3678
3679         return 1;
3680 }
3681
3682 static struct addrconf_sysctl_table
3683 {
3684         struct ctl_table_header *sysctl_header;
3685         ctl_table addrconf_vars[__NET_IPV6_MAX];
3686         ctl_table addrconf_dev[2];
3687         ctl_table addrconf_conf_dir[2];
3688         ctl_table addrconf_proto_dir[2];
3689         ctl_table addrconf_root_dir[2];
3690 } addrconf_sysctl __read_mostly = {
3691         .sysctl_header = NULL,
3692         .addrconf_vars = {
3693                 {
3694                         .ctl_name       =       NET_IPV6_FORWARDING,
3695                         .procname       =       "forwarding",
3696                         .data           =       &ipv6_devconf.forwarding,
3697                         .maxlen         =       sizeof(int),
3698                         .mode           =       0644,
3699                         .proc_handler   =       &addrconf_sysctl_forward,
3700                         .strategy       =       &addrconf_sysctl_forward_strategy,
3701                 },
3702                 {
3703                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3704                         .procname       =       "hop_limit",
3705                         .data           =       &ipv6_devconf.hop_limit,
3706                         .maxlen         =       sizeof(int),
3707                         .mode           =       0644,
3708                         .proc_handler   =       proc_dointvec,
3709                 },
3710                 {
3711                         .ctl_name       =       NET_IPV6_MTU,
3712                         .procname       =       "mtu",
3713                         .data           =       &ipv6_devconf.mtu6,
3714                         .maxlen         =       sizeof(int),
3715                         .mode           =       0644,
3716                         .proc_handler   =       &proc_dointvec,
3717                 },
3718                 {
3719                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3720                         .procname       =       "accept_ra",
3721                         .data           =       &ipv6_devconf.accept_ra,
3722                         .maxlen         =       sizeof(int),
3723                         .mode           =       0644,
3724                         .proc_handler   =       &proc_dointvec,
3725                 },
3726                 {
3727                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3728                         .procname       =       "accept_redirects",
3729                         .data           =       &ipv6_devconf.accept_redirects,
3730                         .maxlen         =       sizeof(int),
3731                         .mode           =       0644,
3732                         .proc_handler   =       &proc_dointvec,
3733                 },
3734                 {
3735                         .ctl_name       =       NET_IPV6_AUTOCONF,
3736                         .procname       =       "autoconf",
3737                         .data           =       &ipv6_devconf.autoconf,
3738                         .maxlen         =       sizeof(int),
3739                         .mode           =       0644,
3740                         .proc_handler   =       &proc_dointvec,
3741                 },
3742                 {
3743                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3744                         .procname       =       "dad_transmits",
3745                         .data           =       &ipv6_devconf.dad_transmits,
3746                         .maxlen         =       sizeof(int),
3747                         .mode           =       0644,
3748                         .proc_handler   =       &proc_dointvec,
3749                 },
3750                 {
3751                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3752                         .procname       =       "router_solicitations",
3753                         .data           =       &ipv6_devconf.rtr_solicits,
3754                         .maxlen         =       sizeof(int),
3755                         .mode           =       0644,
3756                         .proc_handler   =       &proc_dointvec,
3757                 },
3758                 {
3759                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3760                         .procname       =       "router_solicitation_interval",
3761                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3762                         .maxlen         =       sizeof(int),
3763                         .mode           =       0644,
3764                         .proc_handler   =       &proc_dointvec_jiffies,
3765                         .strategy       =       &sysctl_jiffies,
3766                 },
3767                 {
3768                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3769                         .procname       =       "router_solicitation_delay",
3770                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3771                         .maxlen         =       sizeof(int),
3772                         .mode           =       0644,
3773                         .proc_handler   =       &proc_dointvec_jiffies,
3774                         .strategy       =       &sysctl_jiffies,
3775                 },
3776                 {
3777                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3778                         .procname       =       "force_mld_version",
3779                         .data           =       &ipv6_devconf.force_mld_version,
3780                         .maxlen         =       sizeof(int),
3781                         .mode           =       0644,
3782                         .proc_handler   =       &proc_dointvec,
3783                 },
3784 #ifdef CONFIG_IPV6_PRIVACY
3785                 {
3786                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3787                         .procname       =       "use_tempaddr",
3788                         .data           =       &ipv6_devconf.use_tempaddr,
3789                         .maxlen         =       sizeof(int),
3790                         .mode           =       0644,
3791                         .proc_handler   =       &proc_dointvec,
3792                 },
3793                 {
3794                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3795                         .procname       =       "temp_valid_lft",
3796                         .data           =       &ipv6_devconf.temp_valid_lft,
3797                         .maxlen         =       sizeof(int),
3798                         .mode           =       0644,
3799                         .proc_handler   =       &proc_dointvec,
3800                 },
3801                 {
3802                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3803                         .procname       =       "temp_prefered_lft",
3804                         .data           =       &ipv6_devconf.temp_prefered_lft,
3805                         .maxlen         =       sizeof(int),
3806                         .mode           =       0644,
3807                         .proc_handler   =       &proc_dointvec,
3808                 },
3809                 {
3810                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3811                         .procname       =       "regen_max_retry",
3812                         .data           =       &ipv6_devconf.regen_max_retry,
3813                         .maxlen         =       sizeof(int),
3814                         .mode           =       0644,
3815                         .proc_handler   =       &proc_dointvec,
3816                 },
3817                 {
3818                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3819                         .procname       =       "max_desync_factor",
3820                         .data           =       &ipv6_devconf.max_desync_factor,
3821                         .maxlen         =       sizeof(int),
3822                         .mode           =       0644,
3823                         .proc_handler   =       &proc_dointvec,
3824                 },
3825 #endif
3826                 {
3827                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3828                         .procname       =       "max_addresses",
3829                         .data           =       &ipv6_devconf.max_addresses,
3830                         .maxlen         =       sizeof(int),
3831                         .mode           =       0644,
3832                         .proc_handler   =       &proc_dointvec,
3833                 },
3834                 {
3835                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3836                         .procname       =       "accept_ra_defrtr",
3837                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3838                         .maxlen         =       sizeof(int),
3839                         .mode           =       0644,
3840                         .proc_handler   =       &proc_dointvec,
3841                 },
3842                 {
3843                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3844                         .procname       =       "accept_ra_pinfo",
3845                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3846                         .maxlen         =       sizeof(int),
3847                         .mode           =       0644,
3848                         .proc_handler   =       &proc_dointvec,
3849                 },
3850 #ifdef CONFIG_IPV6_ROUTER_PREF
3851                 {
3852                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3853                         .procname       =       "accept_ra_rtr_pref",
3854                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3855                         .maxlen         =       sizeof(int),
3856                         .mode           =       0644,
3857                         .proc_handler   =       &proc_dointvec,
3858                 },
3859                 {
3860                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3861                         .procname       =       "router_probe_interval",
3862                         .data           =       &ipv6_devconf.rtr_probe_interval,
3863                         .maxlen         =       sizeof(int),
3864                         .mode           =       0644,
3865                         .proc_handler   =       &proc_dointvec_jiffies,
3866                         .strategy       =       &sysctl_jiffies,
3867                 },
3868 #ifdef CONFIG_IPV6_ROUTE_INFO
3869                 {
3870                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3871                         .procname       =       "accept_ra_rt_info_max_plen",
3872                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3873                         .maxlen         =       sizeof(int),
3874                         .mode           =       0644,
3875                         .proc_handler   =       &proc_dointvec,
3876                 },
3877 #endif
3878 #endif
3879                 {
3880                         .ctl_name       =       NET_IPV6_PROXY_NDP,
3881                         .procname       =       "proxy_ndp",
3882                         .data           =       &ipv6_devconf.proxy_ndp,
3883                         .maxlen         =       sizeof(int),
3884                         .mode           =       0644,
3885                         .proc_handler   =       &proc_dointvec,
3886                 },
3887                 {
3888                         .ctl_name       =       0,      /* sentinel */
3889                 }
3890         },
3891         .addrconf_dev = {
3892                 {
3893                         .ctl_name       =       NET_PROTO_CONF_ALL,
3894                         .procname       =       "all",
3895                         .mode           =       0555,
3896                         .child          =       addrconf_sysctl.addrconf_vars,
3897                 },
3898                 {
3899                         .ctl_name       =       0,      /* sentinel */
3900                 }
3901         },
3902         .addrconf_conf_dir = {
3903                 {
3904                         .ctl_name       =       NET_IPV6_CONF,
3905                         .procname       =       "conf",
3906                         .mode           =       0555,
3907                         .child          =       addrconf_sysctl.addrconf_dev,
3908                 },
3909                 {
3910                         .ctl_name       =       0,      /* sentinel */
3911                 }
3912         },
3913         .addrconf_proto_dir = {
3914                 {
3915                         .ctl_name       =       NET_IPV6,
3916                         .procname       =       "ipv6",
3917                         .mode           =       0555,
3918                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3919                 },
3920                 {
3921                         .ctl_name       =       0,      /* sentinel */
3922                 }
3923         },
3924         .addrconf_root_dir = {
3925                 {
3926                         .ctl_name       =       CTL_NET,
3927                         .procname       =       "net",
3928                         .mode           =       0555,
3929                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3930                 },
3931                 {
3932                         .ctl_name       =       0,      /* sentinel */
3933                 }
3934         },
3935 };
3936
3937 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3938 {
3939         int i;
3940         struct net_device *dev = idev ? idev->dev : NULL;
3941         struct addrconf_sysctl_table *t;
3942         char *dev_name = NULL;
3943
3944         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
3945         if (t == NULL)
3946                 return;
3947         for (i=0; t->addrconf_vars[i].data; i++) {
3948                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3949                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3950         }
3951         if (dev) {
3952                 dev_name = dev->name;
3953                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3954         } else {
3955                 dev_name = "default";
3956                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3957         }
3958
3959         /*
3960          * Make a copy of dev_name, because '.procname' is regarded as const
3961          * by sysctl and we wouldn't want anyone to change it under our feet
3962          * (see SIOCSIFNAME).
3963          */
3964         dev_name = kstrdup(dev_name, GFP_KERNEL);
3965         if (!dev_name)
3966             goto free;
3967
3968         t->addrconf_dev[0].procname = dev_name;
3969
3970         t->addrconf_dev[0].child = t->addrconf_vars;
3971         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3972         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3973         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3974
3975         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
3976         if (t->sysctl_header == NULL)
3977                 goto free_procname;
3978         else
3979                 p->sysctl = t;
3980         return;
3981
3982         /* error path */
3983  free_procname:
3984         kfree(dev_name);
3985  free:
3986         kfree(t);
3987
3988         return;
3989 }
3990
3991 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3992 {
3993         if (p->sysctl) {
3994                 struct addrconf_sysctl_table *t = p->sysctl;
3995                 p->sysctl = NULL;
3996                 unregister_sysctl_table(t->sysctl_header);
3997                 kfree(t->addrconf_dev[0].procname);
3998                 kfree(t);
3999         }
4000 }
4001
4002
4003 #endif
4004
4005 /*
4006  *      Device notifier
4007  */
4008
4009 int register_inet6addr_notifier(struct notifier_block *nb)
4010 {
4011         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4012 }
4013
4014 int unregister_inet6addr_notifier(struct notifier_block *nb)
4015 {
4016         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4017 }
4018
4019 /*
4020  *      Init / cleanup code
4021  */
4022
4023 int __init addrconf_init(void)
4024 {
4025         int err = 0;
4026
4027         /* The addrconf netdev notifier requires that loopback_dev
4028          * has it's ipv6 private information allocated and setup
4029          * before it can bring up and give link-local addresses
4030          * to other devices which are up.
4031          *
4032          * Unfortunately, loopback_dev is not necessarily the first
4033          * entry in the global dev_base list of net devices.  In fact,
4034          * it is likely to be the very last entry on that list.
4035          * So this causes the notifier registry below to try and
4036          * give link-local addresses to all devices besides loopback_dev
4037          * first, then loopback_dev, which cases all the non-loopback_dev
4038          * devices to fail to get a link-local address.
4039          *
4040          * So, as a temporary fix, allocate the ipv6 structure for
4041          * loopback_dev first by hand.
4042          * Longer term, all of the dependencies ipv6 has upon the loopback
4043          * device and it being up should be removed.
4044          */
4045         rtnl_lock();
4046         if (!ipv6_add_dev(&loopback_dev))
4047                 err = -ENOMEM;
4048         rtnl_unlock();
4049         if (err)
4050                 return err;
4051
4052         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4053
4054         register_netdevice_notifier(&ipv6_dev_notf);
4055
4056         addrconf_verify(0);
4057         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4058 #ifdef CONFIG_SYSCTL
4059         addrconf_sysctl.sysctl_header =
4060                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4061         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4062 #endif
4063
4064         return 0;
4065 }
4066
4067 void __exit addrconf_cleanup(void)
4068 {
4069         struct net_device *dev;
4070         struct inet6_dev *idev;
4071         struct inet6_ifaddr *ifa;
4072         int i;
4073
4074         unregister_netdevice_notifier(&ipv6_dev_notf);
4075
4076         rtnetlink_links[PF_INET6] = NULL;
4077 #ifdef CONFIG_SYSCTL
4078         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4079         addrconf_sysctl_unregister(&ipv6_devconf);
4080 #endif
4081
4082         rtnl_lock();
4083
4084         /*
4085          *      clean dev list.
4086          */
4087
4088         for (dev=dev_base; dev; dev=dev->next) {
4089                 if ((idev = __in6_dev_get(dev)) == NULL)
4090                         continue;
4091                 addrconf_ifdown(dev, 1);
4092         }
4093         addrconf_ifdown(&loopback_dev, 2);
4094
4095         /*
4096          *      Check hash table.
4097          */
4098
4099         write_lock_bh(&addrconf_hash_lock);
4100         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4101                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4102                         struct inet6_ifaddr *bifa;
4103
4104                         bifa = ifa;
4105                         ifa = ifa->lst_next;
4106                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4107                         /* Do not free it; something is wrong.
4108                            Now we can investigate it with debugger.
4109                          */
4110                 }
4111         }
4112         write_unlock_bh(&addrconf_hash_lock);
4113
4114         del_timer(&addr_chk_timer);
4115
4116         rtnl_unlock();
4117
4118 #ifdef CONFIG_PROC_FS
4119         proc_net_remove("if_inet6");
4120 #endif
4121 }