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/sched.h>
  48 #include <linux/net.h>
  49 #include <linux/in6.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/if_addr.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #ifdef CONFIG_SYSCTL
  59 #include <linux/sysctl.h>
  60 #endif
  61 #include <linux/capability.h>
  62 #include <linux/delay.h>
  63 #include <linux/notifier.h>
  64 #include <linux/string.h>
  65
  66 #include <net/sock.h>
  67 #include <net/snmp.h>
  68
  69 #include <net/ipv6.h>
  70 #include <net/protocol.h>
  71 #include <net/ndisc.h>
  72 #include <net/ip6_route.h>
  73 #include <net/addrconf.h>
  74 #include <net/tcp.h>
  75 #include <net/ip.h>
  76 #include <net/netlink.h>
  77 #include <linux/if_tunnel.h>
  78 #include <linux/rtnetlink.h>
  79
  80 #ifdef CONFIG_IPV6_PRIVACY
  81 #include <linux/random.h>
  82 #endif
  83
  84 #include <asm/uaccess.h>
  85
  86 #include <linux/proc_fs.h>
  87 #include <linux/seq_file.h>
  88
  89 /* Set to 3 to get tracing... */
  90 #define ACONF_DEBUG 2
  91
  92 #if ACONF_DEBUG >= 3
  93 #define ADBG(x) printk x
  94 #else
  95 #define ADBG(x)
  96 #endif
  97
  98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
 100
 101 #ifdef CONFIG_SYSCTL
 102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
 103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
 104 #endif
 105
 106 #ifdef CONFIG_IPV6_PRIVACY
 107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
 108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 109 static void ipv6_regen_rndid(unsigned long data);
 110
 111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
 112 #endif
 113
 114 static int ipv6_count_addresses(struct inet6_dev *idev);
 115
 116 /*
 117  *      Configured unicast address hash table
 118  */
 119 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
 120 static DEFINE_RWLOCK(addrconf_hash_lock);
 121
 122 static void addrconf_verify(unsigned long);
 123
 124 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 125 static DEFINE_SPINLOCK(addrconf_verify_lock);
 126
 127 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 129
 130 static int addrconf_ifdown(struct net_device *dev, int how);
 131
 132 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 133 static void addrconf_dad_timer(unsigned long data);
 134 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 135 static void addrconf_dad_run(struct inet6_dev *idev);
 136 static void addrconf_rs_timer(unsigned long data);
 137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 139
 140 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 141                                 struct prefix_info *pinfo);
 142 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 143
 144 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 145
 146 struct ipv6_devconf ipv6_devconf __read_mostly = {
 147         .forwarding             = 0,
 148         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 149         .mtu6                   = IPV6_MIN_MTU,
 150         .accept_ra              = 1,
 151         .accept_redirects       = 1,
 152         .autoconf               = 1,
 153         .force_mld_version      = 0,
 154         .dad_transmits          = 1,
 155         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 156         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 157         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 158 #ifdef CONFIG_IPV6_PRIVACY
 159         .use_tempaddr           = 0,
 160         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 161         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 162         .regen_max_retry        = REGEN_MAX_RETRY,
 163         .max_desync_factor      = MAX_DESYNC_FACTOR,
 164 #endif
 165         .max_addresses          = IPV6_MAX_ADDRESSES,
 166         .accept_ra_defrtr       = 1,
 167         .accept_ra_pinfo        = 1,
 168 #ifdef CONFIG_IPV6_ROUTER_PREF
 169         .accept_ra_rtr_pref     = 1,
 170         .rtr_probe_interval     = 60 * HZ,
 171 #ifdef CONFIG_IPV6_ROUTE_INFO
 172         .accept_ra_rt_info_max_plen = 0,
 173 #endif
 174 #endif
 175         .proxy_ndp              = 0,
 176 };
 177
 178 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 179         .forwarding             = 0,
 180         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 181         .mtu6                   = IPV6_MIN_MTU,
 182         .accept_ra              = 1,
 183         .accept_redirects       = 1,
 184         .autoconf               = 1,
 185         .dad_transmits          = 1,
 186         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 187         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 188         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 189 #ifdef CONFIG_IPV6_PRIVACY
 190         .use_tempaddr           = 0,
 191         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 192         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 193         .regen_max_retry        = REGEN_MAX_RETRY,
 194         .max_desync_factor      = MAX_DESYNC_FACTOR,
 195 #endif
 196         .max_addresses          = IPV6_MAX_ADDRESSES,
 197         .accept_ra_defrtr       = 1,
 198         .accept_ra_pinfo        = 1,
 199 #ifdef CONFIG_IPV6_ROUTER_PREF
 200         .accept_ra_rtr_pref     = 1,
 201         .rtr_probe_interval     = 60 * HZ,
 202 #ifdef CONFIG_IPV6_ROUTE_INFO
 203         .accept_ra_rt_info_max_plen = 0,
 204 #endif
 205 #endif
 206         .proxy_ndp              = 0,
 207 };
 208
 209 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 210 #if 0
 211 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 212 #endif
 213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 214
 215 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 216
 217 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 218 {
 219         switch(scope) {
 220         case IPV6_ADDR_SCOPE_NODELOCAL:
 221                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 222                         IPV6_ADDR_LOOPBACK);
 223         case IPV6_ADDR_SCOPE_LINKLOCAL:
 224                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 225                         IPV6_ADDR_LINKLOCAL);
 226         case IPV6_ADDR_SCOPE_SITELOCAL:
 227                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 228                         IPV6_ADDR_SITELOCAL);
 229         }
 230         return IPV6_ADDR_SCOPE_TYPE(scope);
 231 }
 232
 233 int __ipv6_addr_type(const struct in6_addr *addr)
 234 {
 235         __be32 st;
 236
 237         st = addr->s6_addr32[0];
 238
 239         /* Consider all addresses with the first three bits different of
 240            000 and 111 as unicasts.
 241          */
 242         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 243             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 244                 return (IPV6_ADDR_UNICAST |
 245                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 246
 247         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 248                 /* multicast */
 249                 /* addr-select 3.1 */
 250                 return (IPV6_ADDR_MULTICAST |
 251                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 252         }
 253
 254         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 255                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 256                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 257         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 258                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 259                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 260
 261         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 262                 if (addr->s6_addr32[2] == 0) {
 263                         if (addr->s6_addr32[3] == 0)
 264                                 return IPV6_ADDR_ANY;
 265
 266                         if (addr->s6_addr32[3] == htonl(0x00000001))
 267                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 268                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 269
 270                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 271                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 272                 }
 273
 274                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 275                         return (IPV6_ADDR_MAPPED |
 276                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 277         }
 278
 279         return (IPV6_ADDR_RESERVED |
 280                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 281 }
 282
 283 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 284 {
 285         if (del_timer(&ifp->timer))
 286                 __in6_ifa_put(ifp);
 287 }
 288
 289 enum addrconf_timer_t
 290 {
 291         AC_NONE,
 292         AC_DAD,
 293         AC_RS,
 294 };
 295
 296 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 297                                enum addrconf_timer_t what,
 298                                unsigned long when)
 299 {
 300         if (!del_timer(&ifp->timer))
 301                 in6_ifa_hold(ifp);
 302
 303         switch (what) {
 304         case AC_DAD:
 305                 ifp->timer.function = addrconf_dad_timer;
 306                 break;
 307         case AC_RS:
 308                 ifp->timer.function = addrconf_rs_timer;
 309                 break;
 310         default:;
 311         }
 312         ifp->timer.expires = jiffies + when;
 313         add_timer(&ifp->timer);
 314 }
 315
 316 /* Nobody refers to this device, we may destroy it. */
 317
 318 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
 319 {
 320         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
 321         kfree(idev);
 322 }
 323
 324 void in6_dev_finish_destroy(struct inet6_dev *idev)
 325 {
 326         struct net_device *dev = idev->dev;
 327         BUG_TRAP(idev->addr_list==NULL);
 328         BUG_TRAP(idev->mc_list==NULL);
 329 #ifdef NET_REFCNT_DEBUG
 330         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 331 #endif
 332         dev_put(dev);
 333         if (!idev->dead) {
 334                 printk("Freeing alive inet6 device %p\n", idev);
 335                 return;
 336         }
 337         snmp6_free_dev(idev);
 338         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 339 }
 340
 341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 342 {
 343         struct inet6_dev *ndev;
 344         struct in6_addr maddr;
 345
 346         ASSERT_RTNL();
 347
 348         if (dev->mtu < IPV6_MIN_MTU)
 349                 return NULL;
 350
 351         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 352
 353         if (ndev == NULL)
 354                 return NULL;
 355
 356         rwlock_init(&ndev->lock);
 357         ndev->dev = dev;
 358         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 359         ndev->cnf.mtu6 = dev->mtu;
 360         ndev->cnf.sysctl = NULL;
 361         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 362         if (ndev->nd_parms == NULL) {
 363                 kfree(ndev);
 364                 return NULL;
 365         }
 366         /* We refer to the device */
 367         dev_hold(dev);
 368
 369         if (snmp6_alloc_dev(ndev) < 0) {
 370                 ADBG((KERN_WARNING
 371                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 372                         __FUNCTION__, dev->name));
 373                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 374                 ndev->dead = 1;
 375                 in6_dev_finish_destroy(ndev);
 376                 return NULL;
 377         }
 378
 379         if (snmp6_register_dev(ndev) < 0) {
 380                 ADBG((KERN_WARNING
 381                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 382                         __FUNCTION__, dev->name));
 383                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 384                 ndev->dead = 1;
 385                 in6_dev_finish_destroy(ndev);
 386                 return NULL;
 387         }
 388
 389         /* One reference from device.  We must do this before
 390          * we invoke __ipv6_regen_rndid().
 391          */
 392         in6_dev_hold(ndev);
 393
 394 #ifdef CONFIG_IPV6_PRIVACY
 395         init_timer(&ndev->regen_timer);
 396         ndev->regen_timer.function = ipv6_regen_rndid;
 397         ndev->regen_timer.data = (unsigned long) ndev;
 398         if ((dev->flags&IFF_LOOPBACK) ||
 399             dev->type == ARPHRD_TUNNEL ||
 400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 401             dev->type == ARPHRD_SIT ||
 402 #endif
 403             dev->type == ARPHRD_NONE) {
 404                 printk(KERN_INFO
 405                        "%s: Disabled Privacy Extensions\n",
 406                        dev->name);
 407                 ndev->cnf.use_tempaddr = -1;
 408         } else {
 409                 in6_dev_hold(ndev);
 410                 ipv6_regen_rndid((unsigned long) ndev);
 411         }
 412 #endif
 413
 414         if (netif_carrier_ok(dev))
 415                 ndev->if_flags |= IF_READY;
 416
 417
 418         ipv6_mc_init_dev(ndev);
 419         ndev->tstamp = jiffies;
 420 #ifdef CONFIG_SYSCTL
 421         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 422                               NET_IPV6_NEIGH, "ipv6",
 423                               &ndisc_ifinfo_sysctl_change,
 424                               NULL);
 425         addrconf_sysctl_register(ndev, &ndev->cnf);
 426 #endif
 427         /* protected by rtnl_lock */
 428         rcu_assign_pointer(dev->ip6_ptr, ndev);
 429
 430         /* Join all-node multicast group */
 431         ipv6_addr_all_nodes(&maddr);
 432         ipv6_dev_mc_inc(dev, &maddr);
 433
 434         return ndev;
 435 }
 436
 437 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 438 {
 439         struct inet6_dev *idev;
 440
 441         ASSERT_RTNL();
 442
 443         if ((idev = __in6_dev_get(dev)) == NULL) {
 444                 if ((idev = ipv6_add_dev(dev)) == NULL)
 445                         return NULL;
 446         }
 447
 448         if (dev->flags&IFF_UP)
 449                 ipv6_mc_up(idev);
 450         return idev;
 451 }
 452
 453 #ifdef CONFIG_SYSCTL
 454 static void dev_forward_change(struct inet6_dev *idev)
 455 {
 456         struct net_device *dev;
 457         struct inet6_ifaddr *ifa;
 458         struct in6_addr addr;
 459
 460         if (!idev)
 461                 return;
 462         dev = idev->dev;
 463         if (dev && (dev->flags & IFF_MULTICAST)) {
 464                 ipv6_addr_all_routers(&addr);
 465
 466                 if (idev->cnf.forwarding)
 467                         ipv6_dev_mc_inc(dev, &addr);
 468                 else
 469                         ipv6_dev_mc_dec(dev, &addr);
 470         }
 471         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 472                 if (idev->cnf.forwarding)
 473                         addrconf_join_anycast(ifa);
 474                 else
 475                         addrconf_leave_anycast(ifa);
 476         }
 477 }
 478
 479
 480 static void addrconf_forward_change(void)
 481 {
 482         struct net_device *dev;
 483         struct inet6_dev *idev;
 484
 485         read_lock(&dev_base_lock);
 486         for (dev=dev_base; dev; dev=dev->next) {
 487                 rcu_read_lock();
 488                 idev = __in6_dev_get(dev);
 489                 if (idev) {
 490                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 491                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 492                         if (changed)
 493                                 dev_forward_change(idev);
 494                 }
 495                 rcu_read_unlock();
 496         }
 497         read_unlock(&dev_base_lock);
 498 }
 499 #endif
 500
 501 /* Nobody refers to this ifaddr, destroy it */
 502
 503 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 504 {
 505         BUG_TRAP(ifp->if_next==NULL);
 506         BUG_TRAP(ifp->lst_next==NULL);
 507 #ifdef NET_REFCNT_DEBUG
 508         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 509 #endif
 510
 511         in6_dev_put(ifp->idev);
 512
 513         if (del_timer(&ifp->timer))
 514                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 515
 516         if (!ifp->dead) {
 517                 printk("Freeing alive inet6 address %p\n", ifp);
 518                 return;
 519         }
 520         dst_release(&ifp->rt->u.dst);
 521
 522         kfree(ifp);
 523 }
 524
 525 static void
 526 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 527 {
 528         struct inet6_ifaddr *ifa, **ifap;
 529         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 530
 531         /*
 532          * Each device address list is sorted in order of scope -
 533          * global before linklocal.
 534          */
 535         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 536              ifap = &ifa->if_next) {
 537                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 538                         break;
 539         }
 540
 541         ifp->if_next = *ifap;
 542         *ifap = ifp;
 543 }
 544
 545 /* On success it returns ifp with increased reference count */
 546
 547 static struct inet6_ifaddr *
 548 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 549               int scope, u32 flags)
 550 {
 551         struct inet6_ifaddr *ifa = NULL;
 552         struct rt6_info *rt;
 553         int hash;
 554         int err = 0;
 555
 556         rcu_read_lock_bh();
 557         if (idev->dead) {
 558                 err = -ENODEV;                  /*XXX*/
 559                 goto out2;
 560         }
 561
 562         write_lock(&addrconf_hash_lock);
 563
 564         /* Ignore adding duplicate addresses on an interface */
 565         if (ipv6_chk_same_addr(addr, idev->dev)) {
 566                 ADBG(("ipv6_add_addr: already assigned\n"));
 567                 err = -EEXIST;
 568                 goto out;
 569         }
 570
 571         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 572
 573         if (ifa == NULL) {
 574                 ADBG(("ipv6_add_addr: malloc failed\n"));
 575                 err = -ENOBUFS;
 576                 goto out;
 577         }
 578
 579         rt = addrconf_dst_alloc(idev, addr, 0);
 580         if (IS_ERR(rt)) {
 581                 err = PTR_ERR(rt);
 582                 goto out;
 583         }
 584
 585         ipv6_addr_copy(&ifa->addr, addr);
 586
 587         spin_lock_init(&ifa->lock);
 588         init_timer(&ifa->timer);
 589         ifa->timer.data = (unsigned long) ifa;
 590         ifa->scope = scope;
 591         ifa->prefix_len = pfxlen;
 592         ifa->flags = flags | IFA_F_TENTATIVE;
 593         ifa->cstamp = ifa->tstamp = jiffies;
 594
 595         ifa->rt = rt;
 596
 597         ifa->idev = idev;
 598         in6_dev_hold(idev);
 599         /* For caller */
 600         in6_ifa_hold(ifa);
 601
 602         /* Add to big hash table */
 603         hash = ipv6_addr_hash(addr);
 604
 605         ifa->lst_next = inet6_addr_lst[hash];
 606         inet6_addr_lst[hash] = ifa;
 607         in6_ifa_hold(ifa);
 608         write_unlock(&addrconf_hash_lock);
 609
 610         write_lock(&idev->lock);
 611         /* Add to inet6_dev unicast addr list. */
 612         ipv6_link_dev_addr(idev, ifa);
 613
 614 #ifdef CONFIG_IPV6_PRIVACY
 615         if (ifa->flags&IFA_F_TEMPORARY) {
 616                 ifa->tmp_next = idev->tempaddr_list;
 617                 idev->tempaddr_list = ifa;
 618                 in6_ifa_hold(ifa);
 619         }
 620 #endif
 621
 622         in6_ifa_hold(ifa);
 623         write_unlock(&idev->lock);
 624 out2:
 625         rcu_read_unlock_bh();
 626
 627         if (likely(err == 0))
 628                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 629         else {
 630                 kfree(ifa);
 631                 ifa = ERR_PTR(err);
 632         }
 633
 634         return ifa;
 635 out:
 636         write_unlock(&addrconf_hash_lock);
 637         goto out2;
 638 }
 639
 640 /* This function wants to get referenced ifp and releases it before return */
 641
 642 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 643 {
 644         struct inet6_ifaddr *ifa, **ifap;
 645         struct inet6_dev *idev = ifp->idev;
 646         int hash;
 647         int deleted = 0, onlink = 0;
 648         unsigned long expires = jiffies;
 649
 650         hash = ipv6_addr_hash(&ifp->addr);
 651
 652         ifp->dead = 1;
 653
 654         write_lock_bh(&addrconf_hash_lock);
 655         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 656              ifap = &ifa->lst_next) {
 657                 if (ifa == ifp) {
 658                         *ifap = ifa->lst_next;
 659                         __in6_ifa_put(ifp);
 660                         ifa->lst_next = NULL;
 661                         break;
 662                 }
 663         }
 664         write_unlock_bh(&addrconf_hash_lock);
 665
 666         write_lock_bh(&idev->lock);
 667 #ifdef CONFIG_IPV6_PRIVACY
 668         if (ifp->flags&IFA_F_TEMPORARY) {
 669                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 670                      ifap = &ifa->tmp_next) {
 671                         if (ifa == ifp) {
 672                                 *ifap = ifa->tmp_next;
 673                                 if (ifp->ifpub) {
 674                                         in6_ifa_put(ifp->ifpub);
 675                                         ifp->ifpub = NULL;
 676                                 }
 677                                 __in6_ifa_put(ifp);
 678                                 ifa->tmp_next = NULL;
 679                                 break;
 680                         }
 681                 }
 682         }
 683 #endif
 684
 685         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 686                 if (ifa == ifp) {
 687                         *ifap = ifa->if_next;
 688                         __in6_ifa_put(ifp);
 689                         ifa->if_next = NULL;
 690                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 691                                 break;
 692                         deleted = 1;
 693                         continue;
 694                 } else if (ifp->flags & IFA_F_PERMANENT) {
 695                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 696                                               ifp->prefix_len)) {
 697                                 if (ifa->flags & IFA_F_PERMANENT) {
 698                                         onlink = 1;
 699                                         if (deleted)
 700                                                 break;
 701                                 } else {
 702                                         unsigned long lifetime;
 703
 704                                         if (!onlink)
 705                                                 onlink = -1;
 706
 707                                         spin_lock(&ifa->lock);
 708                                         lifetime = min_t(unsigned long,
 709                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 710                                         if (time_before(expires,
 711                                                         ifa->tstamp + lifetime * HZ))
 712                                                 expires = ifa->tstamp + lifetime * HZ;
 713                                         spin_unlock(&ifa->lock);
 714                                 }
 715                         }
 716                 }
 717                 ifap = &ifa->if_next;
 718         }
 719         write_unlock_bh(&idev->lock);
 720
 721         ipv6_ifa_notify(RTM_DELADDR, ifp);
 722
 723         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 724
 725         addrconf_del_timer(ifp);
 726
 727         /*
 728          * Purge or update corresponding prefix
 729          *
 730          * 1) we don't purge prefix here if address was not permanent.
 731          *    prefix is managed by its own lifetime.
 732          * 2) if there're no addresses, delete prefix.
 733          * 3) if there're still other permanent address(es),
 734          *    corresponding prefix is still permanent.
 735          * 4) otherwise, update prefix lifetime to the
 736          *    longest valid lifetime among the corresponding
 737          *    addresses on the device.
 738          *    Note: subsequent RA will update lifetime.
 739          *
 740          * --yoshfuji
 741          */
 742         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 743                 struct in6_addr prefix;
 744                 struct rt6_info *rt;
 745
 746                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 747                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 748
 749                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 750                         if (onlink == 0) {
 751                                 ip6_del_rt(rt);
 752                                 rt = NULL;
 753                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 754                                 rt->rt6i_expires = expires;
 755                                 rt->rt6i_flags |= RTF_EXPIRES;
 756                         }
 757                 }
 758                 dst_release(&rt->u.dst);
 759         }
 760
 761         in6_ifa_put(ifp);
 762 }
 763
 764 #ifdef CONFIG_IPV6_PRIVACY
 765 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 766 {
 767         struct inet6_dev *idev = ifp->idev;
 768         struct in6_addr addr, *tmpaddr;
 769         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 770         int tmp_plen;
 771         int ret = 0;
 772         int max_addresses;
 773
 774         write_lock(&idev->lock);
 775         if (ift) {
 776                 spin_lock_bh(&ift->lock);
 777                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 778                 spin_unlock_bh(&ift->lock);
 779                 tmpaddr = &addr;
 780         } else {
 781                 tmpaddr = NULL;
 782         }
 783 retry:
 784         in6_dev_hold(idev);
 785         if (idev->cnf.use_tempaddr <= 0) {
 786                 write_unlock(&idev->lock);
 787                 printk(KERN_INFO
 788                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 789                 in6_dev_put(idev);
 790                 ret = -1;
 791                 goto out;
 792         }
 793         spin_lock_bh(&ifp->lock);
 794         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 795                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 796                 spin_unlock_bh(&ifp->lock);
 797                 write_unlock(&idev->lock);
 798                 printk(KERN_WARNING
 799                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 800                 in6_dev_put(idev);
 801                 ret = -1;
 802                 goto out;
 803         }
 804         in6_ifa_hold(ifp);
 805         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 806         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 807                 spin_unlock_bh(&ifp->lock);
 808                 write_unlock(&idev->lock);
 809                 printk(KERN_WARNING
 810                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 811                 in6_ifa_put(ifp);
 812                 in6_dev_put(idev);
 813                 ret = -1;
 814                 goto out;
 815         }
 816         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 817         tmp_valid_lft = min_t(__u32,
 818                               ifp->valid_lft,
 819                               idev->cnf.temp_valid_lft);
 820         tmp_prefered_lft = min_t(__u32,
 821                                  ifp->prefered_lft,
 822                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 823         tmp_plen = ifp->prefix_len;
 824         max_addresses = idev->cnf.max_addresses;
 825         tmp_cstamp = ifp->cstamp;
 826         tmp_tstamp = ifp->tstamp;
 827         spin_unlock_bh(&ifp->lock);
 828
 829         write_unlock(&idev->lock);
 830         ift = !max_addresses ||
 831               ipv6_count_addresses(idev) < max_addresses ?
 832                 ipv6_add_addr(idev, &addr, tmp_plen,
 833                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 834         if (!ift || IS_ERR(ift)) {
 835                 in6_ifa_put(ifp);
 836                 in6_dev_put(idev);
 837                 printk(KERN_INFO
 838                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 839                 tmpaddr = &addr;
 840                 write_lock(&idev->lock);
 841                 goto retry;
 842         }
 843
 844         spin_lock_bh(&ift->lock);
 845         ift->ifpub = ifp;
 846         ift->valid_lft = tmp_valid_lft;
 847         ift->prefered_lft = tmp_prefered_lft;
 848         ift->cstamp = tmp_cstamp;
 849         ift->tstamp = tmp_tstamp;
 850         spin_unlock_bh(&ift->lock);
 851
 852         addrconf_dad_start(ift, 0);
 853         in6_ifa_put(ift);
 854         in6_dev_put(idev);
 855 out:
 856         return ret;
 857 }
 858 #endif
 859
 860 /*
 861  *      Choose an appropriate source address (RFC3484)
 862  */
 863 struct ipv6_saddr_score {
 864         int             addr_type;
 865         unsigned int    attrs;
 866         int             matchlen;
 867         int             scope;
 868         unsigned int    rule;
 869 };
 870
 871 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 872 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 873 #define IPV6_SADDR_SCORE_HOA            0x0008
 874 #define IPV6_SADDR_SCORE_OIF            0x0010
 875 #define IPV6_SADDR_SCORE_LABEL          0x0020
 876 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 877
 878 static int inline ipv6_saddr_preferred(int type)
 879 {
 880         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 881                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 882                 return 1;
 883         return 0;
 884 }
 885
 886 /* static matching label */
 887 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 888 {
 889  /*
 890   *     prefix (longest match)  label
 891   *     -----------------------------
 892   *     ::1/128                 0
 893   *     ::/0                    1
 894   *     2002::/16               2
 895   *     ::/96                   3
 896   *     ::ffff:0:0/96           4
 897   *     fc00::/7                5
 898   *     2001::/32               6
 899   */
 900         if (type & IPV6_ADDR_LOOPBACK)
 901                 return 0;
 902         else if (type & IPV6_ADDR_COMPATv4)
 903                 return 3;
 904         else if (type & IPV6_ADDR_MAPPED)
 905                 return 4;
 906         else if (addr->s6_addr32[0] == htonl(0x20010000))
 907                 return 6;
 908         else if (addr->s6_addr16[0] == htons(0x2002))
 909                 return 2;
 910         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 911                 return 5;
 912         return 1;
 913 }
 914
 915 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 916                        struct in6_addr *daddr, struct in6_addr *saddr)
 917 {
 918         struct ipv6_saddr_score hiscore;
 919         struct inet6_ifaddr *ifa_result = NULL;
 920         int daddr_type = __ipv6_addr_type(daddr);
 921         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 922         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 923         struct net_device *dev;
 924
 925         memset(&hiscore, 0, sizeof(hiscore));
 926
 927         read_lock(&dev_base_lock);
 928         rcu_read_lock();
 929
 930         for (dev = dev_base; dev; dev=dev->next) {
 931                 struct inet6_dev *idev;
 932                 struct inet6_ifaddr *ifa;
 933
 934                 /* Rule 0: Candidate Source Address (section 4)
 935                  *  - multicast and link-local destination address,
 936                  *    the set of candidate source address MUST only
 937                  *    include addresses assigned to interfaces
 938                  *    belonging to the same link as the outgoing
 939                  *    interface.
 940                  * (- For site-local destination addresses, the
 941                  *    set of candidate source addresses MUST only
 942                  *    include addresses assigned to interfaces
 943                  *    belonging to the same site as the outgoing
 944                  *    interface.)
 945                  */
 946                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 947                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 948                     daddr_dev && dev != daddr_dev)
 949                         continue;
 950
 951                 idev = __in6_dev_get(dev);
 952                 if (!idev)
 953                         continue;
 954
 955                 read_lock_bh(&idev->lock);
 956                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 957                         struct ipv6_saddr_score score;
 958
 959                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 960
 961                         /* Rule 0:
 962                          * - Tentative Address (RFC2462 section 5.4)
 963                          *  - A tentative address is not considered
 964                          *    "assigned to an interface" in the traditional
 965                          *    sense.
 966                          * - Candidate Source Address (section 4)
 967                          *  - In any case, anycast addresses, multicast
 968                          *    addresses, and the unspecified address MUST
 969                          *    NOT be included in a candidate set.
 970                          */
 971                         if (ifa->flags & IFA_F_TENTATIVE)
 972                                 continue;
 973                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 974                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 975                                 LIMIT_NETDEBUG(KERN_DEBUG
 976                                                "ADDRCONF: unspecified / multicast address"
 977                                                "assigned as unicast address on %s",
 978                                                dev->name);
 979                                 continue;
 980                         }
 981
 982                         score.attrs = 0;
 983                         score.matchlen = 0;
 984                         score.scope = 0;
 985                         score.rule = 0;
 986
 987                         if (ifa_result == NULL) {
 988                                 /* record it if the first available entry */
 989                                 goto record_it;
 990                         }
 991
 992                         /* Rule 1: Prefer same address */
 993                         if (hiscore.rule < 1) {
 994                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 995                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 996                                 hiscore.rule++;
 997                         }
 998                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 999                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
1000                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1001                                         score.rule = 1;
1002                                         goto record_it;
1003                                 }
1004                         } else {
1005                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1006                                         continue;
1007                         }
1008
1009                         /* Rule 2: Prefer appropriate scope */
1010                         if (hiscore.rule < 2) {
1011                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1012                                 hiscore.rule++;
1013                         }
1014                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1015                         if (hiscore.scope < score.scope) {
1016                                 if (hiscore.scope < daddr_scope) {
1017                                         score.rule = 2;
1018                                         goto record_it;
1019                                 } else
1020                                         continue;
1021                         } else if (score.scope < hiscore.scope) {
1022                                 if (score.scope < daddr_scope)
1023                                         break; /* addresses sorted by scope */
1024                                 else {
1025                                         score.rule = 2;
1026                                         goto record_it;
1027                                 }
1028                         }
1029
1030                         /* Rule 3: Avoid deprecated address */
1031                         if (hiscore.rule < 3) {
1032                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1033                                     !(ifa_result->flags & IFA_F_DEPRECATED))
1034                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1035                                 hiscore.rule++;
1036                         }
1037                         if (ipv6_saddr_preferred(score.addr_type) ||
1038                             !(ifa->flags & IFA_F_DEPRECATED)) {
1039                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1040                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1041                                         score.rule = 3;
1042                                         goto record_it;
1043                                 }
1044                         } else {
1045                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1046                                         continue;
1047                         }
1048
1049                         /* Rule 4: Prefer home address */
1050 #ifdef CONFIG_IPV6_MIP6
1051                         if (hiscore.rule < 4) {
1052                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1053                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1054                                 hiscore.rule++;
1055                         }
1056                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1057                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1058                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1059                                         score.rule = 4;
1060                                         goto record_it;
1061                                 }
1062                         } else {
1063                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1064                                         continue;
1065                         }
1066 #else
1067                         if (hiscore.rule < 4)
1068                                 hiscore.rule++;
1069 #endif
1070
1071                         /* Rule 5: Prefer outgoing interface */
1072                         if (hiscore.rule < 5) {
1073                                 if (daddr_dev == NULL ||
1074                                     daddr_dev == ifa_result->idev->dev)
1075                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1076                                 hiscore.rule++;
1077                         }
1078                         if (daddr_dev == NULL ||
1079                             daddr_dev == ifa->idev->dev) {
1080                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1081                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1082                                         score.rule = 5;
1083                                         goto record_it;
1084                                 }
1085                         } else {
1086                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1087                                         continue;
1088                         }
1089
1090                         /* Rule 6: Prefer matching label */
1091                         if (hiscore.rule < 6) {
1092                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1093                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1094                                 hiscore.rule++;
1095                         }
1096                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1097                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1098                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1099                                         score.rule = 6;
1100                                         goto record_it;
1101                                 }
1102                         } else {
1103                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1104                                         continue;
1105                         }
1106
1107 #ifdef CONFIG_IPV6_PRIVACY
1108                         /* Rule 7: Prefer public address
1109                          * Note: prefer temprary address if use_tempaddr >= 2
1110                          */
1111                         if (hiscore.rule < 7) {
1112                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1113                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1114                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1115                                 hiscore.rule++;
1116                         }
1117                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1118                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1119                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1120                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1121                                         score.rule = 7;
1122                                         goto record_it;
1123                                 }
1124                         } else {
1125                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1126                                         continue;
1127                         }
1128 #else
1129                         if (hiscore.rule < 7)
1130                                 hiscore.rule++;
1131 #endif
1132                         /* Rule 8: Use longest matching prefix */
1133                         if (hiscore.rule < 8) {
1134                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1135                                 hiscore.rule++;
1136                         }
1137                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1138                         if (score.matchlen > hiscore.matchlen) {
1139                                 score.rule = 8;
1140                                 goto record_it;
1141                         }
1142 #if 0
1143                         else if (score.matchlen < hiscore.matchlen)
1144                                 continue;
1145 #endif
1146
1147                         /* Final Rule: choose first available one */
1148                         continue;
1149 record_it:
1150                         if (ifa_result)
1151                                 in6_ifa_put(ifa_result);
1152                         in6_ifa_hold(ifa);
1153                         ifa_result = ifa;
1154                         hiscore = score;
1155                 }
1156                 read_unlock_bh(&idev->lock);
1157         }
1158         rcu_read_unlock();
1159         read_unlock(&dev_base_lock);
1160
1161         if (!ifa_result)
1162                 return -EADDRNOTAVAIL;
1163
1164         ipv6_addr_copy(saddr, &ifa_result->addr);
1165         in6_ifa_put(ifa_result);
1166         return 0;
1167 }
1168
1169
1170 int ipv6_get_saddr(struct dst_entry *dst,
1171                    struct in6_addr *daddr, struct in6_addr *saddr)
1172 {
1173         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1174 }
1175
1176
1177 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1178 {
1179         struct inet6_dev *idev;
1180         int err = -EADDRNOTAVAIL;
1181
1182         rcu_read_lock();
1183         if ((idev = __in6_dev_get(dev)) != NULL) {
1184                 struct inet6_ifaddr *ifp;
1185
1186                 read_lock_bh(&idev->lock);
1187                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1188                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1189                                 ipv6_addr_copy(addr, &ifp->addr);
1190                                 err = 0;
1191                                 break;
1192                         }
1193                 }
1194                 read_unlock_bh(&idev->lock);
1195         }
1196         rcu_read_unlock();
1197         return err;
1198 }
1199
1200 static int ipv6_count_addresses(struct inet6_dev *idev)
1201 {
1202         int cnt = 0;
1203         struct inet6_ifaddr *ifp;
1204
1205         read_lock_bh(&idev->lock);
1206         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1207                 cnt++;
1208         read_unlock_bh(&idev->lock);
1209         return cnt;
1210 }
1211
1212 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1213 {
1214         struct inet6_ifaddr * ifp;
1215         u8 hash = ipv6_addr_hash(addr);
1216
1217         read_lock_bh(&addrconf_hash_lock);
1218         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1219                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1220                     !(ifp->flags&IFA_F_TENTATIVE)) {
1221                         if (dev == NULL || ifp->idev->dev == dev ||
1222                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1223                                 break;
1224                 }
1225         }
1226         read_unlock_bh(&addrconf_hash_lock);
1227         return ifp != NULL;
1228 }
1229
1230 static
1231 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1232 {
1233         struct inet6_ifaddr * ifp;
1234         u8 hash = ipv6_addr_hash(addr);
1235
1236         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1237                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1238                         if (dev == NULL || ifp->idev->dev == dev)
1239                                 break;
1240                 }
1241         }
1242         return ifp != NULL;
1243 }
1244
1245 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1246 {
1247         struct inet6_ifaddr * ifp;
1248         u8 hash = ipv6_addr_hash(addr);
1249
1250         read_lock_bh(&addrconf_hash_lock);
1251         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1252                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1253                         if (dev == NULL || ifp->idev->dev == dev ||
1254                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1255                                 in6_ifa_hold(ifp);
1256                                 break;
1257                         }
1258                 }
1259         }
1260         read_unlock_bh(&addrconf_hash_lock);
1261
1262         return ifp;
1263 }
1264
1265 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1266 {
1267         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1268         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1269         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1270         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1271         int sk_ipv6only = ipv6_only_sock(sk);
1272         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1273         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1274         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1275
1276         if (!sk2_rcv_saddr && !sk_ipv6only)
1277                 return 1;
1278
1279         if (addr_type2 == IPV6_ADDR_ANY &&
1280             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1281                 return 1;
1282
1283         if (addr_type == IPV6_ADDR_ANY &&
1284             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1285                 return 1;
1286
1287         if (sk2_rcv_saddr6 &&
1288             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1289                 return 1;
1290
1291         if (addr_type == IPV6_ADDR_MAPPED &&
1292             !sk2_ipv6only &&
1293             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1294                 return 1;
1295
1296         return 0;
1297 }
1298
1299 /* Gets referenced address, destroys ifaddr */
1300
1301 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1302 {
1303         if (ifp->flags&IFA_F_PERMANENT) {
1304                 spin_lock_bh(&ifp->lock);
1305                 addrconf_del_timer(ifp);
1306                 ifp->flags |= IFA_F_TENTATIVE;
1307                 spin_unlock_bh(&ifp->lock);
1308                 in6_ifa_put(ifp);
1309 #ifdef CONFIG_IPV6_PRIVACY
1310         } else if (ifp->flags&IFA_F_TEMPORARY) {
1311                 struct inet6_ifaddr *ifpub;
1312                 spin_lock_bh(&ifp->lock);
1313                 ifpub = ifp->ifpub;
1314                 if (ifpub) {
1315                         in6_ifa_hold(ifpub);
1316                         spin_unlock_bh(&ifp->lock);
1317                         ipv6_create_tempaddr(ifpub, ifp);
1318                         in6_ifa_put(ifpub);
1319                 } else {
1320                         spin_unlock_bh(&ifp->lock);
1321                 }
1322                 ipv6_del_addr(ifp);
1323 #endif
1324         } else
1325                 ipv6_del_addr(ifp);
1326 }
1327
1328 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1329 {
1330         if (net_ratelimit())
1331                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1332         addrconf_dad_stop(ifp);
1333 }
1334
1335 /* Join to solicited addr multicast group. */
1336
1337 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1338 {
1339         struct in6_addr maddr;
1340
1341         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1342                 return;
1343
1344         addrconf_addr_solict_mult(addr, &maddr);
1345         ipv6_dev_mc_inc(dev, &maddr);
1346 }
1347
1348 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1349 {
1350         struct in6_addr maddr;
1351
1352         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1353                 return;
1354
1355         addrconf_addr_solict_mult(addr, &maddr);
1356         __ipv6_dev_mc_dec(idev, &maddr);
1357 }
1358
1359 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1360 {
1361         struct in6_addr addr;
1362         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1363         if (ipv6_addr_any(&addr))
1364                 return;
1365         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1366 }
1367
1368 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1369 {
1370         struct in6_addr addr;
1371         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1372         if (ipv6_addr_any(&addr))
1373                 return;
1374         __ipv6_dev_ac_dec(ifp->idev, &addr);
1375 }
1376
1377 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1378 {
1379         if (dev->addr_len != ETH_ALEN)
1380                 return -1;
1381         memcpy(eui, dev->dev_addr, 3);
1382         memcpy(eui + 5, dev->dev_addr + 3, 3);
1383
1384         /*
1385          * The zSeries OSA network cards can be shared among various
1386          * OS instances, but the OSA cards have only one MAC address.
1387          * This leads to duplicate address conflicts in conjunction
1388          * with IPv6 if more than one instance uses the same card.
1389          *
1390          * The driver for these cards can deliver a unique 16-bit
1391          * identifier for each instance sharing the same card.  It is
1392          * placed instead of 0xFFFE in the interface identifier.  The
1393          * "u" bit of the interface identifier is not inverted in this
1394          * case.  Hence the resulting interface identifier has local
1395          * scope according to RFC2373.
1396          */
1397         if (dev->dev_id) {
1398                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1399                 eui[4] = dev->dev_id & 0xFF;
1400         } else {
1401                 eui[3] = 0xFF;
1402                 eui[4] = 0xFE;
1403                 eui[0] ^= 2;
1404         }
1405         return 0;
1406 }
1407
1408 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1409 {
1410         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1411         if (dev->addr_len != ARCNET_ALEN)
1412                 return -1;
1413         memset(eui, 0, 7);
1414         eui[7] = *(u8*)dev->dev_addr;
1415         return 0;
1416 }
1417
1418 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1419 {
1420         if (dev->addr_len != INFINIBAND_ALEN)
1421                 return -1;
1422         memcpy(eui, dev->dev_addr + 12, 8);
1423         eui[0] |= 2;
1424         return 0;
1425 }
1426
1427 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1428 {
1429         switch (dev->type) {
1430         case ARPHRD_ETHER:
1431         case ARPHRD_FDDI:
1432         case ARPHRD_IEEE802_TR:
1433                 return addrconf_ifid_eui48(eui, dev);
1434         case ARPHRD_ARCNET:
1435                 return addrconf_ifid_arcnet(eui, dev);
1436         case ARPHRD_INFINIBAND:
1437                 return addrconf_ifid_infiniband(eui, dev);
1438         }
1439         return -1;
1440 }
1441
1442 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1443 {
1444         int err = -1;
1445         struct inet6_ifaddr *ifp;
1446
1447         read_lock_bh(&idev->lock);
1448         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1449                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1450                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1451                         err = 0;
1452                         break;
1453                 }
1454         }
1455         read_unlock_bh(&idev->lock);
1456         return err;
1457 }
1458
1459 #ifdef CONFIG_IPV6_PRIVACY
1460 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1461 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1462 {
1463 regen:
1464         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1465         idev->rndid[0] &= ~0x02;
1466
1467         /*
1468          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1469          * check if generated address is not inappropriate
1470          *
1471          *  - Reserved subnet anycast (RFC 2526)
1472          *      11111101 11....11 1xxxxxxx
1473          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1474          *      00-00-5E-FE-xx-xx-xx-xx
1475          *  - value 0
1476          *  - XXX: already assigned to an address on the device
1477          */
1478         if (idev->rndid[0] == 0xfd &&
1479             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1480             (idev->rndid[7]&0x80))
1481                 goto regen;
1482         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1483                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1484                         goto regen;
1485                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1486                         goto regen;
1487         }
1488
1489         return 0;
1490 }
1491
1492 static void ipv6_regen_rndid(unsigned long data)
1493 {
1494         struct inet6_dev *idev = (struct inet6_dev *) data;
1495         unsigned long expires;
1496
1497         rcu_read_lock_bh();
1498         write_lock_bh(&idev->lock);
1499
1500         if (idev->dead)
1501                 goto out;
1502
1503         if (__ipv6_regen_rndid(idev) < 0)
1504                 goto out;
1505
1506         expires = jiffies +
1507                 idev->cnf.temp_prefered_lft * HZ -
1508                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1509         if (time_before(expires, jiffies)) {
1510                 printk(KERN_WARNING
1511                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1512                         idev->dev->name);
1513                 goto out;
1514         }
1515
1516         if (!mod_timer(&idev->regen_timer, expires))
1517                 in6_dev_hold(idev);
1518
1519 out:
1520         write_unlock_bh(&idev->lock);
1521         rcu_read_unlock_bh();
1522         in6_dev_put(idev);
1523 }
1524
1525 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1526         int ret = 0;
1527
1528         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1529                 ret = __ipv6_regen_rndid(idev);
1530         return ret;
1531 }
1532 #endif
1533
1534 /*
1535  *      Add prefix route.
1536  */
1537
1538 static void
1539 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1540                       unsigned long expires, u32 flags)
1541 {
1542         struct fib6_config cfg = {
1543                 .fc_table = RT6_TABLE_PREFIX,
1544                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1545                 .fc_ifindex = dev->ifindex,
1546                 .fc_expires = expires,
1547                 .fc_dst_len = plen,
1548                 .fc_flags = RTF_UP | flags,
1549         };
1550
1551         ipv6_addr_copy(&cfg.fc_dst, pfx);
1552
1553         /* Prevent useless cloning on PtP SIT.
1554            This thing is done here expecting that the whole
1555            class of non-broadcast devices need not cloning.
1556          */
1557 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1558         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1559                 cfg.fc_flags |= RTF_NONEXTHOP;
1560 #endif
1561
1562         ip6_route_add(&cfg);
1563 }
1564
1565 /* Create "default" multicast route to the interface */
1566
1567 static void addrconf_add_mroute(struct net_device *dev)
1568 {
1569         struct fib6_config cfg = {
1570                 .fc_table = RT6_TABLE_LOCAL,
1571                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1572                 .fc_ifindex = dev->ifindex,
1573                 .fc_dst_len = 8,
1574                 .fc_flags = RTF_UP,
1575         };
1576
1577         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1578
1579         ip6_route_add(&cfg);
1580 }
1581
1582 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1583 static void sit_route_add(struct net_device *dev)
1584 {
1585         struct fib6_config cfg = {
1586                 .fc_table = RT6_TABLE_MAIN,
1587                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1588                 .fc_ifindex = dev->ifindex,
1589                 .fc_dst_len = 96,
1590                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1591         };
1592
1593         /* prefix length - 96 bits "::d.d.d.d" */
1594         ip6_route_add(&cfg);
1595 }
1596 #endif
1597
1598 static void addrconf_add_lroute(struct net_device *dev)
1599 {
1600         struct in6_addr addr;
1601
1602         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1603         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1604 }
1605
1606 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1607 {
1608         struct inet6_dev *idev;
1609
1610         ASSERT_RTNL();
1611
1612         if ((idev = ipv6_find_idev(dev)) == NULL)
1613                 return NULL;
1614
1615         /* Add default multicast route */
1616         addrconf_add_mroute(dev);
1617
1618         /* Add link local route */
1619         addrconf_add_lroute(dev);
1620         return idev;
1621 }
1622
1623 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1624 {
1625         struct prefix_info *pinfo;
1626         __u32 valid_lft;
1627         __u32 prefered_lft;
1628         int addr_type;
1629         unsigned long rt_expires;
1630         struct inet6_dev *in6_dev;
1631
1632         pinfo = (struct prefix_info *) opt;
1633
1634         if (len < sizeof(struct prefix_info)) {
1635                 ADBG(("addrconf: prefix option too short\n"));
1636                 return;
1637         }
1638
1639         /*
1640          *      Validation checks ([ADDRCONF], page 19)
1641          */
1642
1643         addr_type = ipv6_addr_type(&pinfo->prefix);
1644
1645         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1646                 return;
1647
1648         valid_lft = ntohl(pinfo->valid);
1649         prefered_lft = ntohl(pinfo->prefered);
1650
1651         if (prefered_lft > valid_lft) {
1652                 if (net_ratelimit())
1653                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1654                 return;
1655         }
1656
1657         in6_dev = in6_dev_get(dev);
1658
1659         if (in6_dev == NULL) {
1660                 if (net_ratelimit())
1661                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1662                 return;
1663         }
1664
1665         /*
1666          *      Two things going on here:
1667          *      1) Add routes for on-link prefixes
1668          *      2) Configure prefixes with the auto flag set
1669          */
1670
1671         /* Avoid arithmetic overflow. Really, we could
1672            save rt_expires in seconds, likely valid_lft,
1673            but it would require division in fib gc, that it
1674            not good.
1675          */
1676         if (valid_lft >= 0x7FFFFFFF/HZ)
1677                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1678         else
1679                 rt_expires = valid_lft * HZ;
1680
1681         /*
1682          * We convert this (in jiffies) to clock_t later.
1683          * Avoid arithmetic overflow there as well.
1684          * Overflow can happen only if HZ < USER_HZ.
1685          */
1686         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1687                 rt_expires = 0x7FFFFFFF / USER_HZ;
1688
1689         if (pinfo->onlink) {
1690                 struct rt6_info *rt;
1691                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1692
1693                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1694                         if (rt->rt6i_flags&RTF_EXPIRES) {
1695                                 if (valid_lft == 0) {
1696                                         ip6_del_rt(rt);
1697                                         rt = NULL;
1698                                 } else {
1699                                         rt->rt6i_expires = jiffies + rt_expires;
1700                                 }
1701                         }
1702                 } else if (valid_lft) {
1703                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1704                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1705                 }
1706                 if (rt)
1707                         dst_release(&rt->u.dst);
1708         }
1709
1710         /* Try to figure out our local address for this prefix */
1711
1712         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1713                 struct inet6_ifaddr * ifp;
1714                 struct in6_addr addr;
1715                 int create = 0, update_lft = 0;
1716
1717                 if (pinfo->prefix_len == 64) {
1718                         memcpy(&addr, &pinfo->prefix, 8);
1719                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1720                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1721                                 in6_dev_put(in6_dev);
1722                                 return;
1723                         }
1724                         goto ok;
1725                 }
1726                 if (net_ratelimit())
1727                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1728                                pinfo->prefix_len);
1729                 in6_dev_put(in6_dev);
1730                 return;
1731
1732 ok:
1733
1734                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1735
1736                 if (ifp == NULL && valid_lft) {
1737                         int max_addresses = in6_dev->cnf.max_addresses;
1738
1739                         /* Do not allow to create too much of autoconfigured
1740                          * addresses; this would be too easy way to crash kernel.
1741                          */
1742                         if (!max_addresses ||
1743                             ipv6_count_addresses(in6_dev) < max_addresses)
1744                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1745                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1746
1747                         if (!ifp || IS_ERR(ifp)) {
1748                                 in6_dev_put(in6_dev);
1749                                 return;
1750                         }
1751
1752                         update_lft = create = 1;
1753                         ifp->cstamp = jiffies;
1754                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1755                 }
1756
1757                 if (ifp) {
1758                         int flags;
1759                         unsigned long now;
1760 #ifdef CONFIG_IPV6_PRIVACY
1761                         struct inet6_ifaddr *ift;
1762 #endif
1763                         u32 stored_lft;
1764
1765                         /* update lifetime (RFC2462 5.5.3 e) */
1766                         spin_lock(&ifp->lock);
1767                         now = jiffies;
1768                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1769                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1770                         else
1771                                 stored_lft = 0;
1772                         if (!update_lft && stored_lft) {
1773                                 if (valid_lft > MIN_VALID_LIFETIME ||
1774                                     valid_lft > stored_lft)
1775                                         update_lft = 1;
1776                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1777                                         /* valid_lft <= stored_lft is always true */
1778                                         /* XXX: IPsec */
1779                                         update_lft = 0;
1780                                 } else {
1781                                         valid_lft = MIN_VALID_LIFETIME;
1782                                         if (valid_lft < prefered_lft)
1783                                                 prefered_lft = valid_lft;
1784                                         update_lft = 1;
1785                                 }
1786                         }
1787
1788                         if (update_lft) {
1789                                 ifp->valid_lft = valid_lft;
1790                                 ifp->prefered_lft = prefered_lft;
1791                                 ifp->tstamp = now;
1792                                 flags = ifp->flags;
1793                                 ifp->flags &= ~IFA_F_DEPRECATED;
1794                                 spin_unlock(&ifp->lock);
1795
1796                                 if (!(flags&IFA_F_TENTATIVE))
1797                                         ipv6_ifa_notify(0, ifp);
1798                         } else
1799                                 spin_unlock(&ifp->lock);
1800
1801 #ifdef CONFIG_IPV6_PRIVACY
1802                         read_lock_bh(&in6_dev->lock);
1803                         /* update all temporary addresses in the list */
1804                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1805                                 /*
1806                                  * When adjusting the lifetimes of an existing
1807                                  * temporary address, only lower the lifetimes.
1808                                  * Implementations must not increase the
1809                                  * lifetimes of an existing temporary address
1810                                  * when processing a Prefix Information Option.
1811                                  */
1812                                 spin_lock(&ift->lock);
1813                                 flags = ift->flags;
1814                                 if (ift->valid_lft > valid_lft &&
1815                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1816                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1817                                 if (ift->prefered_lft > prefered_lft &&
1818                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1819                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1820                                 spin_unlock(&ift->lock);
1821                                 if (!(flags&IFA_F_TENTATIVE))
1822                                         ipv6_ifa_notify(0, ift);
1823                         }
1824
1825                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1826                                 /*
1827                                  * When a new public address is created as described in [ADDRCONF],
1828                                  * also create a new temporary address.
1829                                  */
1830                                 read_unlock_bh(&in6_dev->lock);
1831                                 ipv6_create_tempaddr(ifp, NULL);
1832                         } else {
1833                                 read_unlock_bh(&in6_dev->lock);
1834                         }
1835 #endif
1836                         in6_ifa_put(ifp);
1837                         addrconf_verify(0);
1838                 }
1839         }
1840         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1841         in6_dev_put(in6_dev);
1842 }
1843
1844 /*
1845  *      Set destination address.
1846  *      Special case for SIT interfaces where we create a new "virtual"
1847  *      device.
1848  */
1849 int addrconf_set_dstaddr(void __user *arg)
1850 {
1851         struct in6_ifreq ireq;
1852         struct net_device *dev;
1853         int err = -EINVAL;
1854
1855         rtnl_lock();
1856
1857         err = -EFAULT;
1858         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1859                 goto err_exit;
1860
1861         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1862
1863         err = -ENODEV;
1864         if (dev == NULL)
1865                 goto err_exit;
1866
1867 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1868         if (dev->type == ARPHRD_SIT) {
1869                 struct ifreq ifr;
1870                 mm_segment_t    oldfs;
1871                 struct ip_tunnel_parm p;
1872
1873                 err = -EADDRNOTAVAIL;
1874                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1875                         goto err_exit;
1876
1877                 memset(&p, 0, sizeof(p));
1878                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1879                 p.iph.saddr = 0;
1880                 p.iph.version = 4;
1881                 p.iph.ihl = 5;
1882                 p.iph.protocol = IPPROTO_IPV6;
1883                 p.iph.ttl = 64;
1884                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1885
1886                 oldfs = get_fs(); set_fs(KERNEL_DS);
1887                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1888                 set_fs(oldfs);
1889
1890                 if (err == 0) {
1891                         err = -ENOBUFS;
1892                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1893                                 goto err_exit;
1894                         err = dev_open(dev);
1895                 }
1896         }
1897 #endif
1898
1899 err_exit:
1900         rtnl_unlock();
1901         return err;
1902 }
1903
1904 /*
1905  *      Manual configuration of address on an interface
1906  */
1907 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1908                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1909 {
1910         struct inet6_ifaddr *ifp;
1911         struct inet6_dev *idev;
1912         struct net_device *dev;
1913         int scope;
1914
1915         ASSERT_RTNL();
1916
1917         /* check the lifetime */
1918         if (!valid_lft || prefered_lft > valid_lft)
1919                 return -EINVAL;
1920
1921         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1922                 return -ENODEV;
1923
1924         if ((idev = addrconf_add_dev(dev)) == NULL)
1925                 return -ENOBUFS;
1926
1927         scope = ipv6_addr_scope(pfx);
1928
1929         if (valid_lft == INFINITY_LIFE_TIME)
1930                 ifa_flags |= IFA_F_PERMANENT;
1931         else if (valid_lft >= 0x7FFFFFFF/HZ)
1932                 valid_lft = 0x7FFFFFFF/HZ;
1933
1934         if (prefered_lft == 0)
1935                 ifa_flags |= IFA_F_DEPRECATED;
1936         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1937                  (prefered_lft != INFINITY_LIFE_TIME))
1938                 prefered_lft = 0x7FFFFFFF/HZ;
1939
1940         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1941
1942         if (!IS_ERR(ifp)) {
1943                 spin_lock_bh(&ifp->lock);
1944                 ifp->valid_lft = valid_lft;
1945                 ifp->prefered_lft = prefered_lft;
1946                 ifp->tstamp = jiffies;
1947                 spin_unlock_bh(&ifp->lock);
1948
1949                 addrconf_dad_start(ifp, 0);
1950                 in6_ifa_put(ifp);
1951                 addrconf_verify(0);
1952                 return 0;
1953         }
1954
1955         return PTR_ERR(ifp);
1956 }
1957
1958 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1959 {
1960         struct inet6_ifaddr *ifp;
1961         struct inet6_dev *idev;
1962         struct net_device *dev;
1963
1964         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1965                 return -ENODEV;
1966
1967         if ((idev = __in6_dev_get(dev)) == NULL)
1968                 return -ENXIO;
1969
1970         read_lock_bh(&idev->lock);
1971         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1972                 if (ifp->prefix_len == plen &&
1973                     ipv6_addr_equal(pfx, &ifp->addr)) {
1974                         in6_ifa_hold(ifp);
1975                         read_unlock_bh(&idev->lock);
1976
1977                         ipv6_del_addr(ifp);
1978
1979                         /* If the last address is deleted administratively,
1980                            disable IPv6 on this interface.
1981                          */
1982                         if (idev->addr_list == NULL)
1983                                 addrconf_ifdown(idev->dev, 1);
1984                         return 0;
1985                 }
1986         }
1987         read_unlock_bh(&idev->lock);
1988         return -EADDRNOTAVAIL;
1989 }
1990
1991
1992 int addrconf_add_ifaddr(void __user *arg)
1993 {
1994         struct in6_ifreq ireq;
1995         int err;
1996
1997         if (!capable(CAP_NET_ADMIN))
1998                 return -EPERM;
1999
2000         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2001                 return -EFAULT;
2002
2003         rtnl_lock();
2004         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2005                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2006         rtnl_unlock();
2007         return err;
2008 }
2009
2010 int addrconf_del_ifaddr(void __user *arg)
2011 {
2012         struct in6_ifreq ireq;
2013         int err;
2014
2015         if (!capable(CAP_NET_ADMIN))
2016                 return -EPERM;
2017
2018         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2019                 return -EFAULT;
2020
2021         rtnl_lock();
2022         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2023         rtnl_unlock();
2024         return err;
2025 }
2026
2027 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2028 static void sit_add_v4_addrs(struct inet6_dev *idev)
2029 {
2030         struct inet6_ifaddr * ifp;
2031         struct in6_addr addr;
2032         struct net_device *dev;
2033         int scope;
2034
2035         ASSERT_RTNL();
2036
2037         memset(&addr, 0, sizeof(struct in6_addr));
2038         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2039
2040         if (idev->dev->flags&IFF_POINTOPOINT) {
2041                 addr.s6_addr32[0] = htonl(0xfe800000);
2042                 scope = IFA_LINK;
2043         } else {
2044                 scope = IPV6_ADDR_COMPATv4;
2045         }
2046
2047         if (addr.s6_addr32[3]) {
2048                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2049                 if (!IS_ERR(ifp)) {
2050                         spin_lock_bh(&ifp->lock);
2051                         ifp->flags &= ~IFA_F_TENTATIVE;
2052                         spin_unlock_bh(&ifp->lock);
2053                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2054                         in6_ifa_put(ifp);
2055                 }
2056                 return;
2057         }
2058
2059         for (dev = dev_base; dev != NULL; dev = dev->next) {
2060                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2061                 if (in_dev && (dev->flags & IFF_UP)) {
2062                         struct in_ifaddr * ifa;
2063
2064                         int flag = scope;
2065
2066                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2067                                 int plen;
2068
2069                                 addr.s6_addr32[3] = ifa->ifa_local;
2070
2071                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2072                                         continue;
2073                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2074                                         if (idev->dev->flags&IFF_POINTOPOINT)
2075                                                 continue;
2076                                         flag |= IFA_HOST;
2077                                 }
2078                                 if (idev->dev->flags&IFF_POINTOPOINT)
2079                                         plen = 64;
2080                                 else
2081                                         plen = 96;
2082
2083                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2084                                                     IFA_F_PERMANENT);
2085                                 if (!IS_ERR(ifp)) {
2086                                         spin_lock_bh(&ifp->lock);
2087                                         ifp->flags &= ~IFA_F_TENTATIVE;
2088                                         spin_unlock_bh(&ifp->lock);
2089                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2090                                         in6_ifa_put(ifp);
2091                                 }
2092                         }
2093                 }
2094         }
2095 }
2096 #endif
2097
2098 static void init_loopback(struct net_device *dev)
2099 {
2100         struct inet6_dev  *idev;
2101         struct inet6_ifaddr * ifp;
2102
2103         /* ::1 */
2104
2105         ASSERT_RTNL();
2106
2107         if ((idev = ipv6_find_idev(dev)) == NULL) {
2108                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2109                 return;
2110         }
2111
2112         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2113         if (!IS_ERR(ifp)) {
2114                 spin_lock_bh(&ifp->lock);
2115                 ifp->flags &= ~IFA_F_TENTATIVE;
2116                 spin_unlock_bh(&ifp->lock);
2117                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2118                 in6_ifa_put(ifp);
2119         }
2120 }
2121
2122 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2123 {
2124         struct inet6_ifaddr * ifp;
2125
2126         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2127         if (!IS_ERR(ifp)) {
2128                 addrconf_dad_start(ifp, 0);
2129                 in6_ifa_put(ifp);
2130         }
2131 }
2132
2133 static void addrconf_dev_config(struct net_device *dev)
2134 {
2135         struct in6_addr addr;
2136         struct inet6_dev    * idev;
2137
2138         ASSERT_RTNL();
2139
2140         if ((dev->type != ARPHRD_ETHER) &&
2141             (dev->type != ARPHRD_FDDI) &&
2142             (dev->type != ARPHRD_IEEE802_TR) &&
2143             (dev->type != ARPHRD_ARCNET) &&
2144             (dev->type != ARPHRD_INFINIBAND)) {
2145                 /* Alas, we support only Ethernet autoconfiguration. */
2146                 return;
2147         }
2148
2149         idev = addrconf_add_dev(dev);
2150         if (idev == NULL)
2151                 return;
2152
2153         memset(&addr, 0, sizeof(struct in6_addr));
2154         addr.s6_addr32[0] = htonl(0xFE800000);
2155
2156         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2157                 addrconf_add_linklocal(idev, &addr);
2158 }
2159
2160 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2161 static void addrconf_sit_config(struct net_device *dev)
2162 {
2163         struct inet6_dev *idev;
2164
2165         ASSERT_RTNL();
2166
2167         /*
2168          * Configure the tunnel with one of our IPv4
2169          * addresses... we should configure all of
2170          * our v4 addrs in the tunnel
2171          */
2172
2173         if ((idev = ipv6_find_idev(dev)) == NULL) {
2174                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2175                 return;
2176         }
2177
2178         sit_add_v4_addrs(idev);
2179
2180         if (dev->flags&IFF_POINTOPOINT) {
2181                 addrconf_add_mroute(dev);
2182                 addrconf_add_lroute(dev);
2183         } else
2184                 sit_route_add(dev);
2185 }
2186 #endif
2187
2188 static inline int
2189 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2190 {
2191         struct in6_addr lladdr;
2192
2193         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2194                 addrconf_add_linklocal(idev, &lladdr);
2195                 return 0;
2196         }
2197         return -1;
2198 }
2199
2200 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2201 {
2202         struct net_device *link_dev;
2203
2204         /* first try to inherit the link-local address from the link device */
2205         if (idev->dev->iflink &&
2206             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2207                 if (!ipv6_inherit_linklocal(idev, link_dev))
2208                         return;
2209         }
2210         /* then try to inherit it from any device */
2211         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2212                 if (!ipv6_inherit_linklocal(idev, link_dev))
2213                         return;
2214         }
2215         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2216 }
2217
2218 /*
2219  * Autoconfigure tunnel with a link-local address so routing protocols,
2220  * DHCPv6, MLD etc. can be run over the virtual link
2221  */
2222
2223 static void addrconf_ip6_tnl_config(struct net_device *dev)
2224 {
2225         struct inet6_dev *idev;
2226
2227         ASSERT_RTNL();
2228
2229         if ((idev = addrconf_add_dev(dev)) == NULL) {
2230                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2231                 return;
2232         }
2233         ip6_tnl_add_linklocal(idev);
2234 }
2235
2236 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2237                            void * data)
2238 {
2239         struct net_device *dev = (struct net_device *) data;
2240         struct inet6_dev *idev = __in6_dev_get(dev);
2241         int run_pending = 0;
2242
2243         switch(event) {
2244         case NETDEV_UP:
2245         case NETDEV_CHANGE:
2246                 if (event == NETDEV_UP) {
2247                         if (!netif_carrier_ok(dev)) {
2248                                 /* device is not ready yet. */
2249                                 printk(KERN_INFO
2250                                         "ADDRCONF(NETDEV_UP): %s: "
2251                                         "link is not ready\n",
2252                                         dev->name);
2253                                 break;
2254                         }
2255
2256                         if (idev)
2257                                 idev->if_flags |= IF_READY;
2258                 } else {
2259                         if (!netif_carrier_ok(dev)) {
2260                                 /* device is still not ready. */
2261                                 break;
2262                         }
2263
2264                         if (idev) {
2265                                 if (idev->if_flags & IF_READY) {
2266                                         /* device is already configured. */
2267                                         break;
2268                                 }
2269                                 idev->if_flags |= IF_READY;
2270                         }
2271
2272                         printk(KERN_INFO
2273                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2274                                         "link becomes ready\n",
2275                                         dev->name);
2276
2277                         run_pending = 1;
2278                 }
2279
2280                 switch(dev->type) {
2281 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2282                 case ARPHRD_SIT:
2283                         addrconf_sit_config(dev);
2284                         break;
2285 #endif
2286                 case ARPHRD_TUNNEL6:
2287                         addrconf_ip6_tnl_config(dev);
2288                         break;
2289                 case ARPHRD_LOOPBACK:
2290                         init_loopback(dev);
2291                         break;
2292
2293                 default:
2294                         addrconf_dev_config(dev);
2295                         break;
2296                 };
2297                 if (idev) {
2298                         if (run_pending)
2299                                 addrconf_dad_run(idev);
2300
2301                         /* If the MTU changed during the interface down, when the
2302                            interface up, the changed MTU must be reflected in the
2303                            idev as well as routers.
2304                          */
2305                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2306                                 rt6_mtu_change(dev, dev->mtu);
2307                                 idev->cnf.mtu6 = dev->mtu;
2308                         }
2309                         idev->tstamp = jiffies;
2310                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2311                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2312                            stop IPv6 on this interface.
2313                          */
2314                         if (dev->mtu < IPV6_MIN_MTU)
2315                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2316                 }
2317                 break;
2318
2319         case NETDEV_CHANGEMTU:
2320                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2321                         rt6_mtu_change(dev, dev->mtu);
2322                         idev->cnf.mtu6 = dev->mtu;
2323                         break;
2324                 }
2325
2326                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2327
2328         case NETDEV_DOWN:
2329         case NETDEV_UNREGISTER:
2330                 /*
2331                  *      Remove all addresses from this interface.
2332                  */
2333                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2334                 break;
2335
2336         case NETDEV_CHANGENAME:
2337 #ifdef CONFIG_SYSCTL
2338                 if (idev) {
2339                         addrconf_sysctl_unregister(&idev->cnf);
2340                         neigh_sysctl_unregister(idev->nd_parms);
2341                         neigh_sysctl_register(dev, idev->nd_parms,
2342                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2343                                               &ndisc_ifinfo_sysctl_change,
2344                                               NULL);
2345                         addrconf_sysctl_register(idev, &idev->cnf);
2346                 }
2347 #endif
2348                 break;
2349         };
2350
2351         return NOTIFY_OK;
2352 }
2353
2354 /*
2355  *      addrconf module should be notified of a device going up
2356  */
2357 static struct notifier_block ipv6_dev_notf = {
2358         .notifier_call = addrconf_notify,
2359         .priority = 0
2360 };
2361
2362 static int addrconf_ifdown(struct net_device *dev, int how)
2363 {
2364         struct inet6_dev *idev;
2365         struct inet6_ifaddr *ifa, **bifa;
2366         int i;
2367
2368         ASSERT_RTNL();
2369
2370         if (dev == &loopback_dev && how == 1)
2371                 how = 0;
2372
2373         rt6_ifdown(dev);
2374         neigh_ifdown(&nd_tbl, dev);
2375
2376         idev = __in6_dev_get(dev);
2377         if (idev == NULL)
2378                 return -ENODEV;
2379
2380         /* Step 1: remove reference to ipv6 device from parent device.
2381                    Do not dev_put!
2382          */
2383         if (how == 1) {
2384                 idev->dead = 1;
2385
2386                 /* protected by rtnl_lock */
2387                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2388
2389                 /* Step 1.5: remove snmp6 entry */
2390                 snmp6_unregister_dev(idev);
2391
2392         }
2393
2394         /* Step 2: clear hash table */
2395         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2396                 bifa = &inet6_addr_lst[i];
2397
2398                 write_lock_bh(&addrconf_hash_lock);
2399                 while ((ifa = *bifa) != NULL) {
2400                         if (ifa->idev == idev) {
2401                                 *bifa = ifa->lst_next;
2402                                 ifa->lst_next = NULL;
2403                                 addrconf_del_timer(ifa);
2404                                 in6_ifa_put(ifa);
2405                                 continue;
2406                         }
2407                         bifa = &ifa->lst_next;
2408                 }
2409                 write_unlock_bh(&addrconf_hash_lock);
2410         }
2411
2412         write_lock_bh(&idev->lock);
2413
2414         /* Step 3: clear flags for stateless addrconf */
2415         if (how != 1)
2416                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2417
2418         /* Step 4: clear address list */
2419 #ifdef CONFIG_IPV6_PRIVACY
2420         if (how == 1 && del_timer(&idev->regen_timer))
2421                 in6_dev_put(idev);
2422
2423         /* clear tempaddr list */
2424         while ((ifa = idev->tempaddr_list) != NULL) {
2425                 idev->tempaddr_list = ifa->tmp_next;
2426                 ifa->tmp_next = NULL;
2427                 ifa->dead = 1;
2428                 write_unlock_bh(&idev->lock);
2429                 spin_lock_bh(&ifa->lock);
2430
2431                 if (ifa->ifpub) {
2432                         in6_ifa_put(ifa->ifpub);
2433                         ifa->ifpub = NULL;
2434                 }
2435                 spin_unlock_bh(&ifa->lock);
2436                 in6_ifa_put(ifa);
2437                 write_lock_bh(&idev->lock);
2438         }
2439 #endif
2440         while ((ifa = idev->addr_list) != NULL) {
2441                 idev->addr_list = ifa->if_next;
2442                 ifa->if_next = NULL;
2443                 ifa->dead = 1;
2444                 addrconf_del_timer(ifa);
2445                 write_unlock_bh(&idev->lock);
2446
2447                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2448                 in6_ifa_put(ifa);
2449
2450                 write_lock_bh(&idev->lock);
2451         }
2452         write_unlock_bh(&idev->lock);
2453
2454         /* Step 5: Discard multicast list */
2455
2456         if (how == 1)
2457                 ipv6_mc_destroy_dev(idev);
2458         else
2459                 ipv6_mc_down(idev);
2460
2461         /* Step 5: netlink notification of this interface */
2462         idev->tstamp = jiffies;
2463         inet6_ifinfo_notify(RTM_DELLINK, idev);
2464
2465         /* Shot the device (if unregistered) */
2466
2467         if (how == 1) {
2468 #ifdef CONFIG_SYSCTL
2469                 addrconf_sysctl_unregister(&idev->cnf);
2470                 neigh_sysctl_unregister(idev->nd_parms);
2471 #endif
2472                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2473                 neigh_ifdown(&nd_tbl, dev);
2474                 in6_dev_put(idev);
2475         }
2476         return 0;
2477 }
2478
2479 static void addrconf_rs_timer(unsigned long data)
2480 {
2481         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2482
2483         if (ifp->idev->cnf.forwarding)
2484                 goto out;
2485
2486         if (ifp->idev->if_flags & IF_RA_RCVD) {
2487                 /*
2488                  *      Announcement received after solicitation
2489                  *      was sent
2490                  */
2491                 goto out;
2492         }
2493
2494         spin_lock(&ifp->lock);
2495         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2496                 struct in6_addr all_routers;
2497
2498                 /* The wait after the last probe can be shorter */
2499                 addrconf_mod_timer(ifp, AC_RS,
2500                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2501                                    ifp->idev->cnf.rtr_solicit_delay :
2502                                    ifp->idev->cnf.rtr_solicit_interval);
2503                 spin_unlock(&ifp->lock);
2504
2505                 ipv6_addr_all_routers(&all_routers);
2506
2507                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2508         } else {
2509                 spin_unlock(&ifp->lock);
2510                 /*
2511                  * Note: we do not support deprecated "all on-link"
2512                  * assumption any longer.
2513                  */
2514                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2515                        ifp->idev->dev->name);
2516         }
2517
2518 out:
2519         in6_ifa_put(ifp);
2520 }
2521
2522 /*
2523  *      Duplicate Address Detection
2524  */
2525 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2526 {
2527         unsigned long rand_num;
2528         struct inet6_dev *idev = ifp->idev;
2529
2530         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2531         ifp->probes = idev->cnf.dad_transmits;
2532         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2533 }
2534
2535 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2536 {
2537         struct inet6_dev *idev = ifp->idev;
2538         struct net_device *dev = idev->dev;
2539
2540         addrconf_join_solict(dev, &ifp->addr);
2541
2542         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2543                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2544                                         flags);
2545
2546         net_srandom(ifp->addr.s6_addr32[3]);
2547
2548         read_lock_bh(&idev->lock);
2549         if (ifp->dead)
2550                 goto out;
2551         spin_lock_bh(&ifp->lock);
2552
2553         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2554             !(ifp->flags&IFA_F_TENTATIVE) ||
2555             ifp->flags & IFA_F_NODAD) {
2556                 ifp->flags &= ~IFA_F_TENTATIVE;
2557                 spin_unlock_bh(&ifp->lock);
2558                 read_unlock_bh(&idev->lock);
2559
2560                 addrconf_dad_completed(ifp);
2561                 return;
2562         }
2563
2564         if (!(idev->if_flags & IF_READY)) {
2565                 spin_unlock_bh(&ifp->lock);
2566                 read_unlock_bh(&idev->lock);
2567                 /*
2568                  * If the defice is not ready:
2569                  * - keep it tentative if it is a permanent address.
2570                  * - otherwise, kill it.
2571                  */
2572                 in6_ifa_hold(ifp);
2573                 addrconf_dad_stop(ifp);
2574                 return;
2575         }
2576         addrconf_dad_kick(ifp);
2577         spin_unlock_bh(&ifp->lock);
2578 out:
2579         read_unlock_bh(&idev->lock);
2580 }
2581
2582 static void addrconf_dad_timer(unsigned long data)
2583 {
2584         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2585         struct inet6_dev *idev = ifp->idev;
2586         struct in6_addr unspec;
2587         struct in6_addr mcaddr;
2588
2589         read_lock_bh(&idev->lock);
2590         if (idev->dead) {
2591                 read_unlock_bh(&idev->lock);
2592                 goto out;
2593         }
2594         spin_lock_bh(&ifp->lock);
2595         if (ifp->probes == 0) {
2596                 /*
2597                  * DAD was successful
2598                  */
2599
2600                 ifp->flags &= ~IFA_F_TENTATIVE;
2601                 spin_unlock_bh(&ifp->lock);
2602                 read_unlock_bh(&idev->lock);
2603
2604                 addrconf_dad_completed(ifp);
2605
2606                 goto out;
2607         }
2608
2609         ifp->probes--;
2610         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2611         spin_unlock_bh(&ifp->lock);
2612         read_unlock_bh(&idev->lock);
2613
2614         /* send a neighbour solicitation for our addr */
2615         memset(&unspec, 0, sizeof(unspec));
2616         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2617         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2618 out:
2619         in6_ifa_put(ifp);
2620 }
2621
2622 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2623 {
2624         struct net_device *     dev = ifp->idev->dev;
2625
2626         /*
2627          *      Configure the address for reception. Now it is valid.
2628          */
2629
2630         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2631
2632         /* If added prefix is link local and forwarding is off,
2633            start sending router solicitations.
2634          */
2635
2636         if (ifp->idev->cnf.forwarding == 0 &&
2637             ifp->idev->cnf.rtr_solicits > 0 &&
2638             (dev->flags&IFF_LOOPBACK) == 0 &&
2639             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2640                 struct in6_addr all_routers;
2641
2642                 ipv6_addr_all_routers(&all_routers);
2643
2644                 /*
2645                  *      If a host as already performed a random delay
2646                  *      [...] as part of DAD [...] there is no need
2647                  *      to delay again before sending the first RS
2648                  */
2649                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2650
2651                 spin_lock_bh(&ifp->lock);
2652                 ifp->probes = 1;
2653                 ifp->idev->if_flags |= IF_RS_SENT;
2654                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2655                 spin_unlock_bh(&ifp->lock);
2656         }
2657 }
2658
2659 static void addrconf_dad_run(struct inet6_dev *idev) {
2660         struct inet6_ifaddr *ifp;
2661
2662         read_lock_bh(&idev->lock);
2663         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2664                 spin_lock_bh(&ifp->lock);
2665                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2666                         spin_unlock_bh(&ifp->lock);
2667                         continue;
2668                 }
2669                 spin_unlock_bh(&ifp->lock);
2670                 addrconf_dad_kick(ifp);
2671         }
2672         read_unlock_bh(&idev->lock);
2673 }
2674
2675 #ifdef CONFIG_PROC_FS
2676 struct if6_iter_state {
2677         int bucket;
2678 };
2679
2680 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2681 {
2682         struct inet6_ifaddr *ifa = NULL;
2683         struct if6_iter_state *state = seq->private;
2684
2685         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2686                 ifa = inet6_addr_lst[state->bucket];
2687                 if (ifa)
2688                         break;
2689         }
2690         return ifa;
2691 }
2692
2693 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2694 {
2695         struct if6_iter_state *state = seq->private;
2696
2697         ifa = ifa->lst_next;
2698 try_again:
2699         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2700                 ifa = inet6_addr_lst[state->bucket];
2701                 goto try_again;
2702         }
2703         return ifa;
2704 }
2705
2706 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2707 {
2708         struct inet6_ifaddr *ifa = if6_get_first(seq);
2709
2710         if (ifa)
2711                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2712                         --pos;
2713         return pos ? NULL : ifa;
2714 }
2715
2716 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2717 {
2718         read_lock_bh(&addrconf_hash_lock);
2719         return if6_get_idx(seq, *pos);
2720 }
2721
2722 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2723 {
2724         struct inet6_ifaddr *ifa;
2725
2726         ifa = if6_get_next(seq, v);
2727         ++*pos;
2728         return ifa;
2729 }
2730
2731 static void if6_seq_stop(struct seq_file *seq, void *v)
2732 {
2733         read_unlock_bh(&addrconf_hash_lock);
2734 }
2735
2736 static int if6_seq_show(struct seq_file *seq, void *v)
2737 {
2738         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2739         seq_printf(seq,
2740                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2741                    NIP6(ifp->addr),
2742                    ifp->idev->dev->ifindex,
2743                    ifp->prefix_len,
2744                    ifp->scope,
2745                    ifp->flags,
2746                    ifp->idev->dev->name);
2747         return 0;
2748 }
2749
2750 static struct seq_operations if6_seq_ops = {
2751         .start  = if6_seq_start,
2752         .next   = if6_seq_next,
2753         .show   = if6_seq_show,
2754         .stop   = if6_seq_stop,
2755 };
2756
2757 static int if6_seq_open(struct inode *inode, struct file *file)
2758 {
2759         struct seq_file *seq;
2760         int rc = -ENOMEM;
2761         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2762
2763         if (!s)
2764                 goto out;
2765
2766         rc = seq_open(file, &if6_seq_ops);
2767         if (rc)
2768                 goto out_kfree;
2769
2770         seq = file->private_data;
2771         seq->private = s;
2772 out:
2773         return rc;
2774 out_kfree:
2775         kfree(s);
2776         goto out;
2777 }
2778
2779 static struct file_operations if6_fops = {
2780         .owner          = THIS_MODULE,
2781         .open           = if6_seq_open,
2782         .read           = seq_read,
2783         .llseek         = seq_lseek,
2784         .release        = seq_release_private,
2785 };
2786
2787 int __init if6_proc_init(void)
2788 {
2789         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2790                 return -ENOMEM;
2791         return 0;
2792 }
2793
2794 void if6_proc_exit(void)
2795 {
2796         proc_net_remove("if_inet6");
2797 }
2798 #endif  /* CONFIG_PROC_FS */
2799
2800 #ifdef CONFIG_IPV6_MIP6
2801 /* Check if address is a home address configured on any interface. */
2802 int ipv6_chk_home_addr(struct in6_addr *addr)
2803 {
2804         int ret = 0;
2805         struct inet6_ifaddr * ifp;
2806         u8 hash = ipv6_addr_hash(addr);
2807         read_lock_bh(&addrconf_hash_lock);
2808         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2809                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2810                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2811                         ret = 1;
2812                         break;
2813                 }
2814         }
2815         read_unlock_bh(&addrconf_hash_lock);
2816         return ret;
2817 }
2818 #endif
2819
2820 /*
2821  *      Periodic address status verification
2822  */
2823
2824 static void addrconf_verify(unsigned long foo)
2825 {
2826         struct inet6_ifaddr *ifp;
2827         unsigned long now, next;
2828         int i;
2829
2830         spin_lock_bh(&addrconf_verify_lock);
2831         now = jiffies;
2832         next = now + ADDR_CHECK_FREQUENCY;
2833
2834         del_timer(&addr_chk_timer);
2835
2836         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2837
2838 restart:
2839                 read_lock(&addrconf_hash_lock);
2840                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2841                         unsigned long age;
2842 #ifdef CONFIG_IPV6_PRIVACY
2843                         unsigned long regen_advance;
2844 #endif
2845
2846                         if (ifp->flags & IFA_F_PERMANENT)
2847                                 continue;
2848
2849                         spin_lock(&ifp->lock);
2850                         age = (now - ifp->tstamp) / HZ;
2851
2852 #ifdef CONFIG_IPV6_PRIVACY
2853                         regen_advance = ifp->idev->cnf.regen_max_retry *
2854                                         ifp->idev->cnf.dad_transmits *
2855                                         ifp->idev->nd_parms->retrans_time / HZ;
2856 #endif
2857
2858                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2859                             age >= ifp->valid_lft) {
2860                                 spin_unlock(&ifp->lock);
2861                                 in6_ifa_hold(ifp);
2862                                 read_unlock(&addrconf_hash_lock);
2863                                 ipv6_del_addr(ifp);
2864                                 goto restart;
2865                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2866                                 spin_unlock(&ifp->lock);
2867                                 continue;
2868                         } else if (age >= ifp->prefered_lft) {
2869                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2870                                 int deprecate = 0;
2871
2872                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2873                                         deprecate = 1;
2874                                         ifp->flags |= IFA_F_DEPRECATED;
2875                                 }
2876
2877                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2878                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2879
2880                                 spin_unlock(&ifp->lock);
2881
2882                                 if (deprecate) {
2883                                         in6_ifa_hold(ifp);
2884                                         read_unlock(&addrconf_hash_lock);
2885
2886                                         ipv6_ifa_notify(0, ifp);
2887                                         in6_ifa_put(ifp);
2888                                         goto restart;
2889                                 }
2890 #ifdef CONFIG_IPV6_PRIVACY
2891                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2892                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2893                                 if (age >= ifp->prefered_lft - regen_advance) {
2894                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2895                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2896                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2897                                         if (!ifp->regen_count && ifpub) {
2898                                                 ifp->regen_count++;
2899                                                 in6_ifa_hold(ifp);
2900                                                 in6_ifa_hold(ifpub);
2901                                                 spin_unlock(&ifp->lock);
2902                                                 read_unlock(&addrconf_hash_lock);
2903                                                 spin_lock(&ifpub->lock);
2904                                                 ifpub->regen_count = 0;
2905                                                 spin_unlock(&ifpub->lock);
2906                                                 ipv6_create_tempaddr(ifpub, ifp);
2907                                                 in6_ifa_put(ifpub);
2908                                                 in6_ifa_put(ifp);
2909                                                 goto restart;
2910                                         }
2911                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2912                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2913                                 spin_unlock(&ifp->lock);
2914 #endif
2915                         } else {
2916                                 /* ifp->prefered_lft <= ifp->valid_lft */
2917                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2918                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2919                                 spin_unlock(&ifp->lock);
2920                         }
2921                 }
2922                 read_unlock(&addrconf_hash_lock);
2923         }
2924
2925         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2926         add_timer(&addr_chk_timer);
2927         spin_unlock_bh(&addrconf_verify_lock);
2928 }
2929
2930 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2931 {
2932         struct in6_addr *pfx = NULL;
2933
2934         if (addr)
2935                 pfx = nla_data(addr);
2936
2937         if (local) {
2938                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2939                         pfx = NULL;
2940                 else
2941                         pfx = nla_data(local);
2942         }
2943
2944         return pfx;
2945 }
2946
2947 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2948         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2949         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2950         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2951 };
2952
2953 static int
2954 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2955 {
2956         struct ifaddrmsg *ifm;
2957         struct nlattr *tb[IFA_MAX+1];
2958         struct in6_addr *pfx;
2959         int err;
2960
2961         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2962         if (err < 0)
2963                 return err;
2964
2965         ifm = nlmsg_data(nlh);
2966         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2967         if (pfx == NULL)
2968                 return -EINVAL;
2969
2970         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2971 }
2972
2973 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2974                              u32 prefered_lft, u32 valid_lft)
2975 {
2976         if (!valid_lft || (prefered_lft > valid_lft))
2977                 return -EINVAL;
2978
2979         if (valid_lft == INFINITY_LIFE_TIME)
2980                 ifa_flags |= IFA_F_PERMANENT;
2981         else if (valid_lft >= 0x7FFFFFFF/HZ)
2982                 valid_lft = 0x7FFFFFFF/HZ;
2983
2984         if (prefered_lft == 0)
2985                 ifa_flags |= IFA_F_DEPRECATED;
2986         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2987                  (prefered_lft != INFINITY_LIFE_TIME))
2988                 prefered_lft = 0x7FFFFFFF/HZ;
2989
2990         spin_lock_bh(&ifp->lock);
2991         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
2992         ifp->tstamp = jiffies;
2993         ifp->valid_lft = valid_lft;
2994         ifp->prefered_lft = prefered_lft;
2995
2996         spin_unlock_bh(&ifp->lock);
2997         if (!(ifp->flags&IFA_F_TENTATIVE))
2998                 ipv6_ifa_notify(0, ifp);
2999
3000         addrconf_verify(0);
3001
3002         return 0;
3003 }
3004
3005 static int
3006 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3007 {
3008         struct ifaddrmsg *ifm;
3009         struct nlattr *tb[IFA_MAX+1];
3010         struct in6_addr *pfx;
3011         struct inet6_ifaddr *ifa;
3012         struct net_device *dev;
3013         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3014         u8 ifa_flags;
3015         int err;
3016
3017         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3018         if (err < 0)
3019                 return err;
3020
3021         ifm = nlmsg_data(nlh);
3022         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3023         if (pfx == NULL)
3024                 return -EINVAL;
3025
3026         if (tb[IFA_CACHEINFO]) {
3027                 struct ifa_cacheinfo *ci;
3028
3029                 ci = nla_data(tb[IFA_CACHEINFO]);
3030                 valid_lft = ci->ifa_valid;
3031                 preferred_lft = ci->ifa_prefered;
3032         } else {
3033                 preferred_lft = INFINITY_LIFE_TIME;
3034                 valid_lft = INFINITY_LIFE_TIME;
3035         }
3036
3037         dev =  __dev_get_by_index(ifm->ifa_index);
3038         if (dev == NULL)
3039                 return -ENODEV;
3040
3041         /* We ignore other flags so far. */
3042         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3043
3044         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3045         if (ifa == NULL) {
3046                 /*
3047                  * It would be best to check for !NLM_F_CREATE here but
3048                  * userspace alreay relies on not having to provide this.
3049                  */
3050                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3051                                       ifa_flags, preferred_lft, valid_lft);
3052         }
3053
3054         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3055             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3056                 err = -EEXIST;
3057         else
3058                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3059
3060         in6_ifa_put(ifa);
3061
3062         return err;
3063 }
3064
3065 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3066                           u8 scope, int ifindex)
3067 {
3068         struct ifaddrmsg *ifm;
3069
3070         ifm = nlmsg_data(nlh);
3071         ifm->ifa_family = AF_INET6;
3072         ifm->ifa_prefixlen = prefixlen;
3073         ifm->ifa_flags = flags;
3074         ifm->ifa_scope = scope;
3075         ifm->ifa_index = ifindex;
3076 }
3077
3078 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3079                          unsigned long tstamp, u32 preferred, u32 valid)
3080 {
3081         struct ifa_cacheinfo ci;
3082
3083         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3084                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3085         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3086                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3087         ci.ifa_prefered = preferred;
3088         ci.ifa_valid = valid;
3089
3090         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3091 }
3092
3093 static inline int rt_scope(int ifa_scope)
3094 {
3095         if (ifa_scope & IFA_HOST)
3096                 return RT_SCOPE_HOST;
3097         else if (ifa_scope & IFA_LINK)
3098                 return RT_SCOPE_LINK;
3099         else if (ifa_scope & IFA_SITE)
3100                 return RT_SCOPE_SITE;
3101         else
3102                 return RT_SCOPE_UNIVERSE;
3103 }
3104
3105 static inline int inet6_ifaddr_msgsize(void)
3106 {
3107         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3108                + nla_total_size(16) /* IFA_ADDRESS */
3109                + nla_total_size(sizeof(struct ifa_cacheinfo));
3110 }
3111
3112 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3113                              u32 pid, u32 seq, int event, unsigned int flags)
3114 {
3115         struct nlmsghdr  *nlh;
3116         u32 preferred, valid;
3117
3118         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3119         if (nlh == NULL)
3120                 return -EMSGSIZE;
3121
3122         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3123                       ifa->idev->dev->ifindex);
3124
3125         if (!(ifa->flags&IFA_F_PERMANENT)) {
3126                 preferred = ifa->prefered_lft;
3127                 valid = ifa->valid_lft;
3128                 if (preferred != INFINITY_LIFE_TIME) {
3129                         long tval = (jiffies - ifa->tstamp)/HZ;
3130                         preferred -= tval;
3131                         if (valid != INFINITY_LIFE_TIME)
3132                                 valid -= tval;
3133                 }
3134         } else {
3135                 preferred = INFINITY_LIFE_TIME;
3136                 valid = INFINITY_LIFE_TIME;
3137         }
3138
3139         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3140             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3141                 nlmsg_cancel(skb, nlh);
3142                 return -EMSGSIZE;
3143         }
3144
3145         return nlmsg_end(skb, nlh);
3146 }
3147
3148 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3149                                 u32 pid, u32 seq, int event, u16 flags)
3150 {
3151         struct nlmsghdr  *nlh;
3152         u8 scope = RT_SCOPE_UNIVERSE;
3153         int ifindex = ifmca->idev->dev->ifindex;
3154
3155         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3156                 scope = RT_SCOPE_SITE;
3157
3158         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3159         if (nlh == NULL)
3160                 return -EMSGSIZE;
3161
3162         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3163         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3164             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3165                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3166                 nlmsg_cancel(skb, nlh);
3167                 return -EMSGSIZE;
3168         }
3169
3170         return nlmsg_end(skb, nlh);
3171 }
3172
3173 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3174                                 u32 pid, u32 seq, int event, unsigned int flags)
3175 {
3176         struct nlmsghdr  *nlh;
3177         u8 scope = RT_SCOPE_UNIVERSE;
3178         int ifindex = ifaca->aca_idev->dev->ifindex;
3179
3180         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3181                 scope = RT_SCOPE_SITE;
3182
3183         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3184         if (nlh == NULL)
3185                 return -EMSGSIZE;
3186
3187         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3188         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3189             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3190                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3191                 nlmsg_cancel(skb, nlh);
3192                 return -EMSGSIZE;
3193         }
3194
3195         return nlmsg_end(skb, nlh);
3196 }
3197
3198 enum addr_type_t
3199 {
3200         UNICAST_ADDR,
3201         MULTICAST_ADDR,
3202         ANYCAST_ADDR,
3203 };
3204
3205 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3206                            enum addr_type_t type)
3207 {
3208         int idx, ip_idx;
3209         int s_idx, s_ip_idx;
3210         int err = 1;
3211         struct net_device *dev;
3212         struct inet6_dev *idev = NULL;
3213         struct inet6_ifaddr *ifa;
3214         struct ifmcaddr6 *ifmca;
3215         struct ifacaddr6 *ifaca;
3216
3217         s_idx = cb->args[0];
3218         s_ip_idx = ip_idx = cb->args[1];
3219         read_lock(&dev_base_lock);
3220
3221         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3222                 if (idx < s_idx)
3223                         continue;
3224                 if (idx > s_idx)
3225                         s_ip_idx = 0;
3226                 ip_idx = 0;
3227                 if ((idev = in6_dev_get(dev)) == NULL)
3228                         continue;
3229                 read_lock_bh(&idev->lock);
3230                 switch (type) {
3231                 case UNICAST_ADDR:
3232                         /* unicast address incl. temp addr */
3233                         for (ifa = idev->addr_list; ifa;
3234                              ifa = ifa->if_next, ip_idx++) {
3235                                 if (ip_idx < s_ip_idx)
3236                                         continue;
3237                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3238                                     NETLINK_CB(cb->skb).pid,
3239                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3240                                     NLM_F_MULTI)) <= 0)
3241                                         goto done;
3242                         }
3243                         break;
3244                 case MULTICAST_ADDR:
3245                         /* multicast address */
3246                         for (ifmca = idev->mc_list; ifmca;
3247                              ifmca = ifmca->next, ip_idx++) {
3248                                 if (ip_idx < s_ip_idx)
3249                                         continue;
3250                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3251                                     NETLINK_CB(cb->skb).pid,
3252                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3253                                     NLM_F_MULTI)) <= 0)
3254                                         goto done;
3255                         }
3256                         break;
3257                 case ANYCAST_ADDR:
3258                         /* anycast address */
3259                         for (ifaca = idev->ac_list; ifaca;
3260                              ifaca = ifaca->aca_next, ip_idx++) {
3261                                 if (ip_idx < s_ip_idx)
3262                                         continue;
3263                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3264                                     NETLINK_CB(cb->skb).pid,
3265                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3266                                     NLM_F_MULTI)) <= 0)
3267                                         goto done;
3268                         }
3269                         break;
3270                 default:
3271                         break;
3272                 }
3273                 read_unlock_bh(&idev->lock);
3274                 in6_dev_put(idev);
3275         }
3276 done:
3277         if (err <= 0) {
3278                 read_unlock_bh(&idev->lock);
3279                 in6_dev_put(idev);
3280         }
3281         read_unlock(&dev_base_lock);
3282         cb->args[0] = idx;
3283         cb->args[1] = ip_idx;
3284         return skb->len;
3285 }
3286
3287 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3288 {
3289         enum addr_type_t type = UNICAST_ADDR;
3290         return inet6_dump_addr(skb, cb, type);
3291 }
3292
3293 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3294 {
3295         enum addr_type_t type = MULTICAST_ADDR;
3296         return inet6_dump_addr(skb, cb, type);
3297 }
3298
3299
3300 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3301 {
3302         enum addr_type_t type = ANYCAST_ADDR;
3303         return inet6_dump_addr(skb, cb, type);
3304 }
3305
3306 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3307                              void *arg)
3308 {
3309         struct ifaddrmsg *ifm;
3310         struct nlattr *tb[IFA_MAX+1];
3311         struct in6_addr *addr = NULL;
3312         struct net_device *dev = NULL;
3313         struct inet6_ifaddr *ifa;
3314         struct sk_buff *skb;
3315         int err;
3316
3317         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3318         if (err < 0)
3319                 goto errout;
3320
3321         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3322         if (addr == NULL) {
3323                 err = -EINVAL;
3324                 goto errout;
3325         }
3326
3327         ifm = nlmsg_data(nlh);
3328         if (ifm->ifa_index)
3329                 dev = __dev_get_by_index(ifm->ifa_index);
3330
3331         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3332                 err = -EADDRNOTAVAIL;
3333                 goto errout;
3334         }
3335
3336         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3337                 err = -ENOBUFS;
3338                 goto errout_ifa;
3339         }
3340
3341         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3342                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3343         if (err < 0) {
3344                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3345                 WARN_ON(err == -EMSGSIZE);
3346                 kfree_skb(skb);
3347                 goto errout_ifa;
3348         }
3349         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3350 errout_ifa:
3351         in6_ifa_put(ifa);
3352 errout:
3353         return err;
3354 }
3355
3356 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3357 {
3358         struct sk_buff *skb;
3359         int err = -ENOBUFS;
3360
3361         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3362         if (skb == NULL)
3363                 goto errout;
3364
3365         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3366         if (err < 0) {
3367                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3368                 WARN_ON(err == -EMSGSIZE);
3369                 kfree_skb(skb);
3370                 goto errout;
3371         }
3372         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3373 errout:
3374         if (err < 0)
3375                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3376 }
3377
3378 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3379                                 __s32 *array, int bytes)
3380 {
3381         BUG_ON(bytes < (DEVCONF_MAX * 4));
3382
3383         memset(array, 0, bytes);
3384         array[DEVCONF_FORWARDING] = cnf->forwarding;
3385         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3386         array[DEVCONF_MTU6] = cnf->mtu6;
3387         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3388         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3389         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3390         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3391         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3392         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3393         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3394         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3395 #ifdef CONFIG_IPV6_PRIVACY
3396         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3397         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3398         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3399         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3400         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3401 #endif
3402         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3403         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3404         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3405 #ifdef CONFIG_IPV6_ROUTER_PREF
3406         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3407         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3408 #ifdef CONFIG_IPV6_ROUTE_INFO
3409         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3410 #endif
3411 #endif
3412         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3413 }
3414
3415 static inline size_t inet6_if_nlmsg_size(void)
3416 {
3417         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3418                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3419                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3420                + nla_total_size(4) /* IFLA_MTU */
3421                + nla_total_size(4) /* IFLA_LINK */
3422                + nla_total_size( /* IFLA_PROTINFO */
3423                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3424                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3425                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3426                  );
3427 }
3428
3429 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3430                              u32 pid, u32 seq, int event, unsigned int flags)
3431 {
3432         struct net_device *dev = idev->dev;
3433         struct nlattr *conf;
3434         struct ifinfomsg *hdr;
3435         struct nlmsghdr *nlh;
3436         void *protoinfo;
3437         struct ifla_cacheinfo ci;
3438
3439         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3440         if (nlh == NULL)
3441                 return -EMSGSIZE;
3442
3443         hdr = nlmsg_data(nlh);
3444         hdr->ifi_family = AF_INET6;
3445         hdr->__ifi_pad = 0;
3446         hdr->ifi_type = dev->type;
3447         hdr->ifi_index = dev->ifindex;
3448         hdr->ifi_flags = dev_get_flags(dev);
3449         hdr->ifi_change = 0;
3450
3451         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3452
3453         if (dev->addr_len)
3454                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3455
3456         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3457         if (dev->ifindex != dev->iflink)
3458                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3459
3460         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3461         if (protoinfo == NULL)
3462                 goto nla_put_failure;
3463
3464         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3465
3466         ci.max_reasm_len = IPV6_MAXPLEN;
3467         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3468                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3469         ci.reachable_time = idev->nd_parms->reachable_time;
3470         ci.retrans_time = idev->nd_parms->retrans_time;
3471         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3472
3473         conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3474         if (conf == NULL)
3475                 goto nla_put_failure;
3476         ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
3477
3478         /* XXX - Statistics/MC not implemented */
3479
3480         nla_nest_end(skb, protoinfo);
3481         return nlmsg_end(skb, nlh);
3482
3483 nla_put_failure:
3484         nlmsg_cancel(skb, nlh);
3485         return -EMSGSIZE;
3486 }
3487
3488 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3489 {
3490         int idx, err;
3491         int s_idx = cb->args[0];
3492         struct net_device *dev;
3493         struct inet6_dev *idev;
3494
3495         read_lock(&dev_base_lock);
3496         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3497                 if (idx < s_idx)
3498                         continue;
3499                 if ((idev = in6_dev_get(dev)) == NULL)
3500                         continue;
3501                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3502                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3503                 in6_dev_put(idev);
3504                 if (err <= 0)
3505                         break;
3506         }
3507         read_unlock(&dev_base_lock);
3508         cb->args[0] = idx;
3509
3510         return skb->len;
3511 }
3512
3513 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3514 {
3515         struct sk_buff *skb;
3516         int err = -ENOBUFS;
3517
3518         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3519         if (skb == NULL)
3520                 goto errout;
3521
3522         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3523         if (err < 0) {
3524                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3525                 WARN_ON(err == -EMSGSIZE);
3526                 kfree_skb(skb);
3527                 goto errout;
3528         }
3529         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3530 errout:
3531         if (err < 0)
3532                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3533 }
3534
3535 static inline size_t inet6_prefix_nlmsg_size(void)
3536 {
3537         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3538                + nla_total_size(sizeof(struct in6_addr))
3539                + nla_total_size(sizeof(struct prefix_cacheinfo));
3540 }
3541
3542 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3543                              struct prefix_info *pinfo, u32 pid, u32 seq,
3544                              int event, unsigned int flags)
3545 {
3546         struct prefixmsg *pmsg;
3547         struct nlmsghdr *nlh;
3548         struct prefix_cacheinfo ci;
3549
3550         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3551         if (nlh == NULL)
3552                 return -EMSGSIZE;
3553
3554         pmsg = nlmsg_data(nlh);
3555         pmsg->prefix_family = AF_INET6;
3556         pmsg->prefix_pad1 = 0;
3557         pmsg->prefix_pad2 = 0;
3558         pmsg->prefix_ifindex = idev->dev->ifindex;
3559         pmsg->prefix_len = pinfo->prefix_len;
3560         pmsg->prefix_type = pinfo->type;
3561         pmsg->prefix_pad3 = 0;
3562         pmsg->prefix_flags = 0;
3563         if (pinfo->onlink)
3564                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3565         if (pinfo->autoconf)
3566                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3567
3568         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3569
3570         ci.preferred_time = ntohl(pinfo->prefered);
3571         ci.valid_time = ntohl(pinfo->valid);
3572         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3573
3574         return nlmsg_end(skb, nlh);
3575
3576 nla_put_failure:
3577         nlmsg_cancel(skb, nlh);
3578         return -EMSGSIZE;
3579 }
3580
3581 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3582                          struct prefix_info *pinfo)
3583 {
3584         struct sk_buff *skb;
3585         int err = -ENOBUFS;
3586
3587         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3588         if (skb == NULL)
3589                 goto errout;
3590
3591         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3592         if (err < 0) {
3593                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3594                 WARN_ON(err == -EMSGSIZE);
3595                 kfree_skb(skb);
3596                 goto errout;
3597         }
3598         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3599 errout:
3600         if (err < 0)
3601                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3602 }
3603
3604 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3605         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3606         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3607         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3608         [RTM_GETADDR - RTM_BASE] = { .doit      = inet6_rtm_getaddr,
3609                                      .dumpit    = inet6_dump_ifaddr, },
3610         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3611         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3612         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3613         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3614         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3615                                       .dumpit   = inet6_dump_fib, },
3616 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3617         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = fib6_rules_dump,   },
3618 #endif
3619 };
3620
3621 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3622 {
3623         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3624
3625         switch (event) {
3626         case RTM_NEWADDR:
3627                 ip6_ins_rt(ifp->rt);
3628                 if (ifp->idev->cnf.forwarding)
3629                         addrconf_join_anycast(ifp);
3630                 break;
3631         case RTM_DELADDR:
3632                 if (ifp->idev->cnf.forwarding)
3633                         addrconf_leave_anycast(ifp);
3634                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3635                 dst_hold(&ifp->rt->u.dst);
3636                 if (ip6_del_rt(ifp->rt))
3637                         dst_free(&ifp->rt->u.dst);
3638                 break;
3639         }
3640 }
3641
3642 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3643 {
3644         rcu_read_lock_bh();
3645         if (likely(ifp->idev->dead == 0))
3646                 __ipv6_ifa_notify(event, ifp);
3647         rcu_read_unlock_bh();
3648 }
3649
3650 #ifdef CONFIG_SYSCTL
3651
3652 static
3653 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3654                            void __user *buffer, size_t *lenp, loff_t *ppos)
3655 {
3656         int *valp = ctl->data;
3657         int val = *valp;
3658         int ret;
3659
3660         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3661
3662         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3663                 if (valp != &ipv6_devconf.forwarding) {
3664                         if ((!*valp) ^ (!val)) {
3665                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3666                                 if (idev == NULL)
3667                                         return ret;
3668                                 dev_forward_change(idev);
3669                         }
3670                 } else {
3671                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3672                         addrconf_forward_change();
3673                 }
3674                 if (*valp)
3675                         rt6_purge_dflt_routers();
3676         }
3677
3678         return ret;
3679 }
3680
3681 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3682                                             int __user *name, int nlen,
3683                                             void __user *oldval,
3684                                             size_t __user *oldlenp,
3685                                             void __user *newval, size_t newlen)
3686 {
3687         int *valp = table->data;
3688         int new;
3689
3690         if (!newval || !newlen)
3691                 return 0;
3692         if (newlen != sizeof(int))
3693                 return -EINVAL;
3694         if (get_user(new, (int __user *)newval))
3695                 return -EFAULT;
3696         if (new == *valp)
3697                 return 0;
3698         if (oldval && oldlenp) {
3699                 size_t len;
3700                 if (get_user(len, oldlenp))
3701                         return -EFAULT;
3702                 if (len) {
3703                         if (len > table->maxlen)
3704                                 len = table->maxlen;
3705                         if (copy_to_user(oldval, valp, len))
3706                                 return -EFAULT;
3707                         if (put_user(len, oldlenp))
3708                                 return -EFAULT;
3709                 }
3710         }
3711
3712         if (valp != &ipv6_devconf_dflt.forwarding) {
3713                 if (valp != &ipv6_devconf.forwarding) {
3714                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3715                         int changed;
3716                         if (unlikely(idev == NULL))
3717                                 return -ENODEV;
3718                         changed = (!*valp) ^ (!new);
3719                         *valp = new;
3720                         if (changed)
3721                                 dev_forward_change(idev);
3722                 } else {
3723                         *valp = new;
3724                         addrconf_forward_change();
3725                 }
3726
3727                 if (*valp)
3728                         rt6_purge_dflt_routers();
3729         } else
3730                 *valp = new;
3731
3732         return 1;
3733 }
3734
3735 static struct addrconf_sysctl_table
3736 {
3737         struct ctl_table_header *sysctl_header;
3738         ctl_table addrconf_vars[__NET_IPV6_MAX];
3739         ctl_table addrconf_dev[2];
3740         ctl_table addrconf_conf_dir[2];
3741         ctl_table addrconf_proto_dir[2];
3742         ctl_table addrconf_root_dir[2];
3743 } addrconf_sysctl __read_mostly = {
3744         .sysctl_header = NULL,
3745         .addrconf_vars = {
3746                 {
3747                         .ctl_name       =       NET_IPV6_FORWARDING,
3748                         .procname       =       "forwarding",
3749                         .data           =       &ipv6_devconf.forwarding,
3750                         .maxlen         =       sizeof(int),
3751                         .mode           =       0644,
3752                         .proc_handler   =       &addrconf_sysctl_forward,
3753                         .strategy       =       &addrconf_sysctl_forward_strategy,
3754                 },
3755                 {
3756                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3757                         .procname       =       "hop_limit",
3758                         .data           =       &ipv6_devconf.hop_limit,
3759                         .maxlen         =       sizeof(int),
3760                         .mode           =       0644,
3761                         .proc_handler   =       proc_dointvec,
3762                 },
3763                 {
3764                         .ctl_name       =       NET_IPV6_MTU,
3765                         .procname       =       "mtu",
3766                         .data           =       &ipv6_devconf.mtu6,
3767                         .maxlen         =       sizeof(int),
3768                         .mode           =       0644,
3769                         .proc_handler   =       &proc_dointvec,
3770                 },
3771                 {
3772                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3773                         .procname       =       "accept_ra",
3774                         .data           =       &ipv6_devconf.accept_ra,
3775                         .maxlen         =       sizeof(int),
3776                         .mode           =       0644,
3777                         .proc_handler   =       &proc_dointvec,
3778                 },
3779                 {
3780                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3781                         .procname       =       "accept_redirects",
3782                         .data           =       &ipv6_devconf.accept_redirects,
3783                         .maxlen         =       sizeof(int),
3784                         .mode           =       0644,
3785                         .proc_handler   =       &proc_dointvec,
3786                 },
3787                 {
3788                         .ctl_name       =       NET_IPV6_AUTOCONF,
3789                         .procname       =       "autoconf",
3790                         .data           =       &ipv6_devconf.autoconf,
3791                         .maxlen         =       sizeof(int),
3792                         .mode           =       0644,
3793                         .proc_handler   =       &proc_dointvec,
3794                 },
3795                 {
3796                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3797                         .procname       =       "dad_transmits",
3798                         .data           =       &ipv6_devconf.dad_transmits,
3799                         .maxlen         =       sizeof(int),
3800                         .mode           =       0644,
3801                         .proc_handler   =       &proc_dointvec,
3802                 },
3803                 {
3804                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3805                         .procname       =       "router_solicitations",
3806                         .data           =       &ipv6_devconf.rtr_solicits,
3807                         .maxlen         =       sizeof(int),
3808                         .mode           =       0644,
3809                         .proc_handler   =       &proc_dointvec,
3810                 },
3811                 {
3812                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3813                         .procname       =       "router_solicitation_interval",
3814                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3815                         .maxlen         =       sizeof(int),
3816                         .mode           =       0644,
3817                         .proc_handler   =       &proc_dointvec_jiffies,
3818                         .strategy       =       &sysctl_jiffies,
3819                 },
3820                 {
3821                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3822                         .procname       =       "router_solicitation_delay",
3823                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3824                         .maxlen         =       sizeof(int),
3825                         .mode           =       0644,
3826                         .proc_handler   =       &proc_dointvec_jiffies,
3827                         .strategy       =       &sysctl_jiffies,
3828                 },
3829                 {
3830                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3831                         .procname       =       "force_mld_version",
3832                         .data           =       &ipv6_devconf.force_mld_version,
3833                         .maxlen         =       sizeof(int),
3834                         .mode           =       0644,
3835                         .proc_handler   =       &proc_dointvec,
3836                 },
3837 #ifdef CONFIG_IPV6_PRIVACY
3838                 {
3839                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3840                         .procname       =       "use_tempaddr",
3841                         .data           =       &ipv6_devconf.use_tempaddr,
3842                         .maxlen         =       sizeof(int),
3843                         .mode           =       0644,
3844                         .proc_handler   =       &proc_dointvec,
3845                 },
3846                 {
3847                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3848                         .procname       =       "temp_valid_lft",
3849                         .data           =       &ipv6_devconf.temp_valid_lft,
3850                         .maxlen         =       sizeof(int),
3851                         .mode           =       0644,
3852                         .proc_handler   =       &proc_dointvec,
3853                 },
3854                 {
3855                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3856                         .procname       =       "temp_prefered_lft",
3857                         .data           =       &ipv6_devconf.temp_prefered_lft,
3858                         .maxlen         =       sizeof(int),
3859                         .mode           =       0644,
3860                         .proc_handler   =       &proc_dointvec,
3861                 },
3862                 {
3863                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3864                         .procname       =       "regen_max_retry",
3865                         .data           =       &ipv6_devconf.regen_max_retry,
3866                         .maxlen         =       sizeof(int),
3867                         .mode           =       0644,
3868                         .proc_handler   =       &proc_dointvec,
3869                 },
3870                 {
3871                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3872                         .procname       =       "max_desync_factor",
3873                         .data           =       &ipv6_devconf.max_desync_factor,
3874                         .maxlen         =       sizeof(int),
3875                         .mode           =       0644,
3876                         .proc_handler   =       &proc_dointvec,
3877                 },
3878 #endif
3879                 {
3880                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3881                         .procname       =       "max_addresses",
3882                         .data           =       &ipv6_devconf.max_addresses,
3883                         .maxlen         =       sizeof(int),
3884                         .mode           =       0644,
3885                         .proc_handler   =       &proc_dointvec,
3886                 },
3887                 {
3888                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3889                         .procname       =       "accept_ra_defrtr",
3890                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3891                         .maxlen         =       sizeof(int),
3892                         .mode           =       0644,
3893                         .proc_handler   =       &proc_dointvec,
3894                 },
3895                 {
3896                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3897                         .procname       =       "accept_ra_pinfo",
3898                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3899                         .maxlen         =       sizeof(int),
3900                         .mode           =       0644,
3901                         .proc_handler   =       &proc_dointvec,
3902                 },
3903 #ifdef CONFIG_IPV6_ROUTER_PREF
3904                 {
3905                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3906                         .procname       =       "accept_ra_rtr_pref",
3907                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3908                         .maxlen         =       sizeof(int),
3909                         .mode           =       0644,
3910                         .proc_handler   =       &proc_dointvec,
3911                 },
3912                 {
3913                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3914                         .procname       =       "router_probe_interval",
3915                         .data           =       &ipv6_devconf.rtr_probe_interval,
3916                         .maxlen         =       sizeof(int),
3917                         .mode           =       0644,
3918                         .proc_handler   =       &proc_dointvec_jiffies,
3919                         .strategy       =       &sysctl_jiffies,
3920                 },
3921 #ifdef CONFIG_IPV6_ROUTE_INFO
3922                 {
3923                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3924                         .procname       =       "accept_ra_rt_info_max_plen",
3925                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3926                         .maxlen         =       sizeof(int),
3927                         .mode           =       0644,
3928                         .proc_handler   =       &proc_dointvec,
3929                 },
3930 #endif
3931 #endif
3932                 {
3933                         .ctl_name       =       NET_IPV6_PROXY_NDP,
3934                         .procname       =       "proxy_ndp",
3935                         .data           =       &ipv6_devconf.proxy_ndp,
3936                         .maxlen         =       sizeof(int),
3937                         .mode           =       0644,
3938                         .proc_handler   =       &proc_dointvec,
3939                 },
3940                 {
3941                         .ctl_name       =       0,      /* sentinel */
3942                 }
3943         },
3944         .addrconf_dev = {
3945                 {
3946                         .ctl_name       =       NET_PROTO_CONF_ALL,
3947                         .procname       =       "all",
3948                         .mode           =       0555,
3949                         .child          =       addrconf_sysctl.addrconf_vars,
3950                 },
3951                 {
3952                         .ctl_name       =       0,      /* sentinel */
3953                 }
3954         },
3955         .addrconf_conf_dir = {
3956                 {
3957                         .ctl_name       =       NET_IPV6_CONF,
3958                         .procname       =       "conf",
3959                         .mode           =       0555,
3960                         .child          =       addrconf_sysctl.addrconf_dev,
3961                 },
3962                 {
3963                         .ctl_name       =       0,      /* sentinel */
3964                 }
3965         },
3966         .addrconf_proto_dir = {
3967                 {
3968                         .ctl_name       =       NET_IPV6,
3969                         .procname       =       "ipv6",
3970                         .mode           =       0555,
3971                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3972                 },
3973                 {
3974                         .ctl_name       =       0,      /* sentinel */
3975                 }
3976         },
3977         .addrconf_root_dir = {
3978                 {
3979                         .ctl_name       =       CTL_NET,
3980                         .procname       =       "net",
3981                         .mode           =       0555,
3982                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3983                 },
3984                 {
3985                         .ctl_name       =       0,      /* sentinel */
3986                 }
3987         },
3988 };
3989
3990 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3991 {
3992         int i;
3993         struct net_device *dev = idev ? idev->dev : NULL;
3994         struct addrconf_sysctl_table *t;
3995         char *dev_name = NULL;
3996
3997         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
3998         if (t == NULL)
3999                 return;
4000         for (i=0; t->addrconf_vars[i].data; i++) {
4001                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4002                 t->addrconf_vars[i].de = NULL;
4003                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4004         }
4005         if (dev) {
4006                 dev_name = dev->name;
4007                 t->addrconf_dev[0].ctl_name = dev->ifindex;
4008         } else {
4009                 dev_name = "default";
4010                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4011         }
4012
4013         /*
4014          * Make a copy of dev_name, because '.procname' is regarded as const
4015          * by sysctl and we wouldn't want anyone to change it under our feet
4016          * (see SIOCSIFNAME).
4017          */
4018         dev_name = kstrdup(dev_name, GFP_KERNEL);
4019         if (!dev_name)
4020             goto free;
4021
4022         t->addrconf_dev[0].procname = dev_name;
4023
4024         t->addrconf_dev[0].child = t->addrconf_vars;
4025         t->addrconf_dev[0].de = NULL;
4026         t->addrconf_conf_dir[0].child = t->addrconf_dev;
4027         t->addrconf_conf_dir[0].de = NULL;
4028         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4029         t->addrconf_proto_dir[0].de = NULL;
4030         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4031         t->addrconf_root_dir[0].de = NULL;
4032
4033         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
4034         if (t->sysctl_header == NULL)
4035                 goto free_procname;
4036         else
4037                 p->sysctl = t;
4038         return;
4039
4040         /* error path */
4041  free_procname:
4042         kfree(dev_name);
4043  free:
4044         kfree(t);
4045
4046         return;
4047 }
4048
4049 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4050 {
4051         if (p->sysctl) {
4052                 struct addrconf_sysctl_table *t = p->sysctl;
4053                 p->sysctl = NULL;
4054                 unregister_sysctl_table(t->sysctl_header);
4055                 kfree(t->addrconf_dev[0].procname);
4056                 kfree(t);
4057         }
4058 }
4059
4060
4061 #endif
4062
4063 /*
4064  *      Device notifier
4065  */
4066
4067 int register_inet6addr_notifier(struct notifier_block *nb)
4068 {
4069         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4070 }
4071
4072 int unregister_inet6addr_notifier(struct notifier_block *nb)
4073 {
4074         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4075 }
4076
4077 /*
4078  *      Init / cleanup code
4079  */
4080
4081 int __init addrconf_init(void)
4082 {
4083         int err = 0;
4084
4085         /* The addrconf netdev notifier requires that loopback_dev
4086          * has it's ipv6 private information allocated and setup
4087          * before it can bring up and give link-local addresses
4088          * to other devices which are up.
4089          *
4090          * Unfortunately, loopback_dev is not necessarily the first
4091          * entry in the global dev_base list of net devices.  In fact,
4092          * it is likely to be the very last entry on that list.
4093          * So this causes the notifier registry below to try and
4094          * give link-local addresses to all devices besides loopback_dev
4095          * first, then loopback_dev, which cases all the non-loopback_dev
4096          * devices to fail to get a link-local address.
4097          *
4098          * So, as a temporary fix, allocate the ipv6 structure for
4099          * loopback_dev first by hand.
4100          * Longer term, all of the dependencies ipv6 has upon the loopback
4101          * device and it being up should be removed.
4102          */
4103         rtnl_lock();
4104         if (!ipv6_add_dev(&loopback_dev))
4105                 err = -ENOMEM;
4106         rtnl_unlock();
4107         if (err)
4108                 return err;
4109
4110         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4111
4112         register_netdevice_notifier(&ipv6_dev_notf);
4113
4114         addrconf_verify(0);
4115         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4116 #ifdef CONFIG_SYSCTL
4117         addrconf_sysctl.sysctl_header =
4118                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
4119         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4120 #endif
4121
4122         return 0;
4123 }
4124
4125 void __exit addrconf_cleanup(void)
4126 {
4127         struct net_device *dev;
4128         struct inet6_dev *idev;
4129         struct inet6_ifaddr *ifa;
4130         int i;
4131
4132         unregister_netdevice_notifier(&ipv6_dev_notf);
4133
4134         rtnetlink_links[PF_INET6] = NULL;
4135 #ifdef CONFIG_SYSCTL
4136         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4137         addrconf_sysctl_unregister(&ipv6_devconf);
4138 #endif
4139
4140         rtnl_lock();
4141
4142         /*
4143          *      clean dev list.
4144          */
4145
4146         for (dev=dev_base; dev; dev=dev->next) {
4147                 if ((idev = __in6_dev_get(dev)) == NULL)
4148                         continue;
4149                 addrconf_ifdown(dev, 1);
4150         }
4151         addrconf_ifdown(&loopback_dev, 2);
4152
4153         /*
4154          *      Check hash table.
4155          */
4156
4157         write_lock_bh(&addrconf_hash_lock);
4158         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4159                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4160                         struct inet6_ifaddr *bifa;
4161
4162                         bifa = ifa;
4163                         ifa = ifa->lst_next;
4164                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4165                         /* Do not free it; something is wrong.
4166                            Now we can investigate it with debugger.
4167                          */
4168                 }
4169         }
4170         write_unlock_bh(&addrconf_hash_lock);
4171
4172         del_timer(&addr_chk_timer);
4173
4174         rtnl_unlock();
4175
4176 #ifdef CONFIG_PROC_FS
4177         proc_net_remove("if_inet6");
4178 #endif
4179 }