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