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   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 /* Protects inet6 devices */
 123 DEFINE_RWLOCK(addrconf_lock);
 124
 125 static void addrconf_verify(unsigned long);
 126
 127 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 128 static DEFINE_SPINLOCK(addrconf_verify_lock);
 129
 130 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 131 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 132
 133 static int addrconf_ifdown(struct net_device *dev, int how);
 134
 135 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
 136 static void addrconf_dad_timer(unsigned long data);
 137 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 138 static void addrconf_dad_run(struct inet6_dev *idev);
 139 static void addrconf_rs_timer(unsigned long data);
 140 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 141 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 142
 143 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 144                                 struct prefix_info *pinfo);
 145 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
 146
 147 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 148
 149 struct ipv6_devconf ipv6_devconf __read_mostly = {
 150         .forwarding             = 0,
 151         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 152         .mtu6                   = IPV6_MIN_MTU,
 153         .accept_ra              = 1,
 154         .accept_redirects       = 1,
 155         .autoconf               = 1,
 156         .force_mld_version      = 0,
 157         .dad_transmits          = 1,
 158         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 159         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 160         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 161 #ifdef CONFIG_IPV6_PRIVACY
 162         .use_tempaddr           = 0,
 163         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 164         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 165         .regen_max_retry        = REGEN_MAX_RETRY,
 166         .max_desync_factor      = MAX_DESYNC_FACTOR,
 167 #endif
 168         .max_addresses          = IPV6_MAX_ADDRESSES,
 169         .accept_ra_defrtr       = 1,
 170         .accept_ra_pinfo        = 1,
 171 #ifdef CONFIG_IPV6_ROUTER_PREF
 172         .accept_ra_rtr_pref     = 1,
 173         .rtr_probe_interval     = 60 * HZ,
 174 #ifdef CONFIG_IPV6_ROUTE_INFO
 175         .accept_ra_rt_info_max_plen = 0,
 176 #endif
 177 #endif
 178 };
 179
 180 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 181         .forwarding             = 0,
 182         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 183         .mtu6                   = IPV6_MIN_MTU,
 184         .accept_ra              = 1,
 185         .accept_redirects       = 1,
 186         .autoconf               = 1,
 187         .dad_transmits          = 1,
 188         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 189         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 190         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 191 #ifdef CONFIG_IPV6_PRIVACY
 192         .use_tempaddr           = 0,
 193         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 194         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 195         .regen_max_retry        = REGEN_MAX_RETRY,
 196         .max_desync_factor      = MAX_DESYNC_FACTOR,
 197 #endif
 198         .max_addresses          = IPV6_MAX_ADDRESSES,
 199         .accept_ra_defrtr       = 1,
 200         .accept_ra_pinfo        = 1,
 201 #ifdef CONFIG_IPV6_ROUTER_PREF
 202         .accept_ra_rtr_pref     = 1,
 203         .rtr_probe_interval     = 60 * HZ,
 204 #ifdef CONFIG_IPV6_ROUTE_INFO
 205         .accept_ra_rt_info_max_plen = 0,
 206 #endif
 207 #endif
 208 };
 209
 210 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 211 #if 0
 212 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 213 #endif
 214 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 215
 216 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
 217
 218 static inline unsigned ipv6_addr_scope2type(unsigned scope)
 219 {
 220         switch(scope) {
 221         case IPV6_ADDR_SCOPE_NODELOCAL:
 222                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
 223                         IPV6_ADDR_LOOPBACK);
 224         case IPV6_ADDR_SCOPE_LINKLOCAL:
 225                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
 226                         IPV6_ADDR_LINKLOCAL);
 227         case IPV6_ADDR_SCOPE_SITELOCAL:
 228                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
 229                         IPV6_ADDR_SITELOCAL);
 230         }
 231         return IPV6_ADDR_SCOPE_TYPE(scope);
 232 }
 233
 234 int __ipv6_addr_type(const struct in6_addr *addr)
 235 {
 236         u32 st;
 237
 238         st = addr->s6_addr32[0];
 239
 240         /* Consider all addresses with the first three bits different of
 241            000 and 111 as unicasts.
 242          */
 243         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
 244             (st & htonl(0xE0000000)) != htonl(0xE0000000))
 245                 return (IPV6_ADDR_UNICAST |
 246                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
 247
 248         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
 249                 /* multicast */
 250                 /* addr-select 3.1 */
 251                 return (IPV6_ADDR_MULTICAST |
 252                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
 253         }
 254
 255         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
 256                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
 257                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
 258         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
 259                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
 260                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
 261
 262         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
 263                 if (addr->s6_addr32[2] == 0) {
 264                         if (addr->s6_addr32[3] == 0)
 265                                 return IPV6_ADDR_ANY;
 266
 267                         if (addr->s6_addr32[3] == htonl(0x00000001))
 268                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
 269                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
 270
 271                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
 272                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 273                 }
 274
 275                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
 276                         return (IPV6_ADDR_MAPPED |
 277                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
 278         }
 279
 280         return (IPV6_ADDR_RESERVED |
 281                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
 282 }
 283
 284 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 285 {
 286         if (del_timer(&ifp->timer))
 287                 __in6_ifa_put(ifp);
 288 }
 289
 290 enum addrconf_timer_t
 291 {
 292         AC_NONE,
 293         AC_DAD,
 294         AC_RS,
 295 };
 296
 297 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 298                                enum addrconf_timer_t what,
 299                                unsigned long when)
 300 {
 301         if (!del_timer(&ifp->timer))
 302                 in6_ifa_hold(ifp);
 303
 304         switch (what) {
 305         case AC_DAD:
 306                 ifp->timer.function = addrconf_dad_timer;
 307                 break;
 308         case AC_RS:
 309                 ifp->timer.function = addrconf_rs_timer;
 310                 break;
 311         default:;
 312         }
 313         ifp->timer.expires = jiffies + when;
 314         add_timer(&ifp->timer);
 315 }
 316
 317 /* Nobody refers to this device, we may destroy it. */
 318
 319 void in6_dev_finish_destroy(struct inet6_dev *idev)
 320 {
 321         struct net_device *dev = idev->dev;
 322         BUG_TRAP(idev->addr_list==NULL);
 323         BUG_TRAP(idev->mc_list==NULL);
 324 #ifdef NET_REFCNT_DEBUG
 325         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
 326 #endif
 327         dev_put(dev);
 328         if (!idev->dead) {
 329                 printk("Freeing alive inet6 device %p\n", idev);
 330                 return;
 331         }
 332         snmp6_free_dev(idev);
 333         kfree(idev);
 334 }
 335
 336 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 337 {
 338         struct inet6_dev *ndev;
 339
 340         ASSERT_RTNL();
 341
 342         if (dev->mtu < IPV6_MIN_MTU)
 343                 return NULL;
 344
 345         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 346
 347         if (ndev == NULL)
 348                 return NULL;
 349
 350         rwlock_init(&ndev->lock);
 351         ndev->dev = dev;
 352         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
 353         ndev->cnf.mtu6 = dev->mtu;
 354         ndev->cnf.sysctl = NULL;
 355         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 356         if (ndev->nd_parms == NULL) {
 357                 kfree(ndev);
 358                 return NULL;
 359         }
 360         /* We refer to the device */
 361         dev_hold(dev);
 362
 363         if (snmp6_alloc_dev(ndev) < 0) {
 364                 ADBG((KERN_WARNING
 365                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
 366                         __FUNCTION__, dev->name));
 367                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 368                 ndev->dead = 1;
 369                 in6_dev_finish_destroy(ndev);
 370                 return NULL;
 371         }
 372
 373         if (snmp6_register_dev(ndev) < 0) {
 374                 ADBG((KERN_WARNING
 375                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
 376                         __FUNCTION__, dev->name));
 377                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 378                 ndev->dead = 1;
 379                 in6_dev_finish_destroy(ndev);
 380                 return NULL;
 381         }
 382
 383         /* One reference from device.  We must do this before
 384          * we invoke __ipv6_regen_rndid().
 385          */
 386         in6_dev_hold(ndev);
 387
 388 #ifdef CONFIG_IPV6_PRIVACY
 389         init_timer(&ndev->regen_timer);
 390         ndev->regen_timer.function = ipv6_regen_rndid;
 391         ndev->regen_timer.data = (unsigned long) ndev;
 392         if ((dev->flags&IFF_LOOPBACK) ||
 393             dev->type == ARPHRD_TUNNEL ||
 394             dev->type == ARPHRD_NONE ||
 395             dev->type == ARPHRD_SIT) {
 396                 printk(KERN_INFO
 397                        "%s: Disabled Privacy Extensions\n",
 398                        dev->name);
 399                 ndev->cnf.use_tempaddr = -1;
 400         } else {
 401                 in6_dev_hold(ndev);
 402                 ipv6_regen_rndid((unsigned long) ndev);
 403         }
 404 #endif
 405
 406         if (netif_carrier_ok(dev))
 407                 ndev->if_flags |= IF_READY;
 408
 409         write_lock_bh(&addrconf_lock);
 410         dev->ip6_ptr = ndev;
 411         write_unlock_bh(&addrconf_lock);
 412
 413         ipv6_mc_init_dev(ndev);
 414         ndev->tstamp = jiffies;
 415 #ifdef CONFIG_SYSCTL
 416         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
 417                               NET_IPV6_NEIGH, "ipv6",
 418                               &ndisc_ifinfo_sysctl_change,
 419                               NULL);
 420         addrconf_sysctl_register(ndev, &ndev->cnf);
 421 #endif
 422         return ndev;
 423 }
 424
 425 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
 426 {
 427         struct inet6_dev *idev;
 428
 429         ASSERT_RTNL();
 430
 431         if ((idev = __in6_dev_get(dev)) == NULL) {
 432                 if ((idev = ipv6_add_dev(dev)) == NULL)
 433                         return NULL;
 434         }
 435
 436         if (dev->flags&IFF_UP)
 437                 ipv6_mc_up(idev);
 438         return idev;
 439 }
 440
 441 #ifdef CONFIG_SYSCTL
 442 static void dev_forward_change(struct inet6_dev *idev)
 443 {
 444         struct net_device *dev;
 445         struct inet6_ifaddr *ifa;
 446         struct in6_addr addr;
 447
 448         if (!idev)
 449                 return;
 450         dev = idev->dev;
 451         if (dev && (dev->flags & IFF_MULTICAST)) {
 452                 ipv6_addr_all_routers(&addr);
 453
 454                 if (idev->cnf.forwarding)
 455                         ipv6_dev_mc_inc(dev, &addr);
 456                 else
 457                         ipv6_dev_mc_dec(dev, &addr);
 458         }
 459         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
 460                 if (idev->cnf.forwarding)
 461                         addrconf_join_anycast(ifa);
 462                 else
 463                         addrconf_leave_anycast(ifa);
 464         }
 465 }
 466
 467
 468 static void addrconf_forward_change(void)
 469 {
 470         struct net_device *dev;
 471         struct inet6_dev *idev;
 472
 473         read_lock(&dev_base_lock);
 474         for (dev=dev_base; dev; dev=dev->next) {
 475                 read_lock(&addrconf_lock);
 476                 idev = __in6_dev_get(dev);
 477                 if (idev) {
 478                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
 479                         idev->cnf.forwarding = ipv6_devconf.forwarding;
 480                         if (changed)
 481                                 dev_forward_change(idev);
 482                 }
 483                 read_unlock(&addrconf_lock);
 484         }
 485         read_unlock(&dev_base_lock);
 486 }
 487 #endif
 488
 489 /* Nobody refers to this ifaddr, destroy it */
 490
 491 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 492 {
 493         BUG_TRAP(ifp->if_next==NULL);
 494         BUG_TRAP(ifp->lst_next==NULL);
 495 #ifdef NET_REFCNT_DEBUG
 496         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
 497 #endif
 498
 499         in6_dev_put(ifp->idev);
 500
 501         if (del_timer(&ifp->timer))
 502                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
 503
 504         if (!ifp->dead) {
 505                 printk("Freeing alive inet6 address %p\n", ifp);
 506                 return;
 507         }
 508         dst_release(&ifp->rt->u.dst);
 509
 510         kfree(ifp);
 511 }
 512
 513 static void
 514 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 515 {
 516         struct inet6_ifaddr *ifa, **ifap;
 517         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 518
 519         /*
 520          * Each device address list is sorted in order of scope -
 521          * global before linklocal.
 522          */
 523         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
 524              ifap = &ifa->if_next) {
 525                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 526                         break;
 527         }
 528
 529         ifp->if_next = *ifap;
 530         *ifap = ifp;
 531 }
 532
 533 /* On success it returns ifp with increased reference count */
 534
 535 static struct inet6_ifaddr *
 536 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 537               int scope, u32 flags)
 538 {
 539         struct inet6_ifaddr *ifa = NULL;
 540         struct rt6_info *rt;
 541         int hash;
 542         int err = 0;
 543
 544         read_lock_bh(&addrconf_lock);
 545         if (idev->dead) {
 546                 err = -ENODEV;                  /*XXX*/
 547                 goto out2;
 548         }
 549
 550         write_lock(&addrconf_hash_lock);
 551
 552         /* Ignore adding duplicate addresses on an interface */
 553         if (ipv6_chk_same_addr(addr, idev->dev)) {
 554                 ADBG(("ipv6_add_addr: already assigned\n"));
 555                 err = -EEXIST;
 556                 goto out;
 557         }
 558
 559         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 560
 561         if (ifa == NULL) {
 562                 ADBG(("ipv6_add_addr: malloc failed\n"));
 563                 err = -ENOBUFS;
 564                 goto out;
 565         }
 566
 567         rt = addrconf_dst_alloc(idev, addr, 0);
 568         if (IS_ERR(rt)) {
 569                 err = PTR_ERR(rt);
 570                 goto out;
 571         }
 572
 573         ipv6_addr_copy(&ifa->addr, addr);
 574
 575         spin_lock_init(&ifa->lock);
 576         init_timer(&ifa->timer);
 577         ifa->timer.data = (unsigned long) ifa;
 578         ifa->scope = scope;
 579         ifa->prefix_len = pfxlen;
 580         ifa->flags = flags | IFA_F_TENTATIVE;
 581         ifa->cstamp = ifa->tstamp = jiffies;
 582
 583         ifa->rt = rt;
 584
 585         ifa->idev = idev;
 586         in6_dev_hold(idev);
 587         /* For caller */
 588         in6_ifa_hold(ifa);
 589
 590         /* Add to big hash table */
 591         hash = ipv6_addr_hash(addr);
 592
 593         ifa->lst_next = inet6_addr_lst[hash];
 594         inet6_addr_lst[hash] = ifa;
 595         in6_ifa_hold(ifa);
 596         write_unlock(&addrconf_hash_lock);
 597
 598         write_lock(&idev->lock);
 599         /* Add to inet6_dev unicast addr list. */
 600         ipv6_link_dev_addr(idev, ifa);
 601
 602 #ifdef CONFIG_IPV6_PRIVACY
 603         if (ifa->flags&IFA_F_TEMPORARY) {
 604                 ifa->tmp_next = idev->tempaddr_list;
 605                 idev->tempaddr_list = ifa;
 606                 in6_ifa_hold(ifa);
 607         }
 608 #endif
 609
 610         in6_ifa_hold(ifa);
 611         write_unlock(&idev->lock);
 612 out2:
 613         read_unlock_bh(&addrconf_lock);
 614
 615         if (likely(err == 0))
 616                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 617         else {
 618                 kfree(ifa);
 619                 ifa = ERR_PTR(err);
 620         }
 621
 622         return ifa;
 623 out:
 624         write_unlock(&addrconf_hash_lock);
 625         goto out2;
 626 }
 627
 628 /* This function wants to get referenced ifp and releases it before return */
 629
 630 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 631 {
 632         struct inet6_ifaddr *ifa, **ifap;
 633         struct inet6_dev *idev = ifp->idev;
 634         int hash;
 635         int deleted = 0, onlink = 0;
 636         unsigned long expires = jiffies;
 637
 638         hash = ipv6_addr_hash(&ifp->addr);
 639
 640         ifp->dead = 1;
 641
 642         write_lock_bh(&addrconf_hash_lock);
 643         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
 644              ifap = &ifa->lst_next) {
 645                 if (ifa == ifp) {
 646                         *ifap = ifa->lst_next;
 647                         __in6_ifa_put(ifp);
 648                         ifa->lst_next = NULL;
 649                         break;
 650                 }
 651         }
 652         write_unlock_bh(&addrconf_hash_lock);
 653
 654         write_lock_bh(&idev->lock);
 655 #ifdef CONFIG_IPV6_PRIVACY
 656         if (ifp->flags&IFA_F_TEMPORARY) {
 657                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
 658                      ifap = &ifa->tmp_next) {
 659                         if (ifa == ifp) {
 660                                 *ifap = ifa->tmp_next;
 661                                 if (ifp->ifpub) {
 662                                         in6_ifa_put(ifp->ifpub);
 663                                         ifp->ifpub = NULL;
 664                                 }
 665                                 __in6_ifa_put(ifp);
 666                                 ifa->tmp_next = NULL;
 667                                 break;
 668                         }
 669                 }
 670         }
 671 #endif
 672
 673         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
 674                 if (ifa == ifp) {
 675                         *ifap = ifa->if_next;
 676                         __in6_ifa_put(ifp);
 677                         ifa->if_next = NULL;
 678                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 679                                 break;
 680                         deleted = 1;
 681                         continue;
 682                 } else if (ifp->flags & IFA_F_PERMANENT) {
 683                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 684                                               ifp->prefix_len)) {
 685                                 if (ifa->flags & IFA_F_PERMANENT) {
 686                                         onlink = 1;
 687                                         if (deleted)
 688                                                 break;
 689                                 } else {
 690                                         unsigned long lifetime;
 691
 692                                         if (!onlink)
 693                                                 onlink = -1;
 694
 695                                         spin_lock(&ifa->lock);
 696                                         lifetime = min_t(unsigned long,
 697                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
 698                                         if (time_before(expires,
 699                                                         ifa->tstamp + lifetime * HZ))
 700                                                 expires = ifa->tstamp + lifetime * HZ;
 701                                         spin_unlock(&ifa->lock);
 702                                 }
 703                         }
 704                 }
 705                 ifap = &ifa->if_next;
 706         }
 707         write_unlock_bh(&idev->lock);
 708
 709         ipv6_ifa_notify(RTM_DELADDR, ifp);
 710
 711         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 712
 713         addrconf_del_timer(ifp);
 714
 715         /*
 716          * Purge or update corresponding prefix
 717          *
 718          * 1) we don't purge prefix here if address was not permanent.
 719          *    prefix is managed by its own lifetime.
 720          * 2) if there're no addresses, delete prefix.
 721          * 3) if there're still other permanent address(es),
 722          *    corresponding prefix is still permanent.
 723          * 4) otherwise, update prefix lifetime to the
 724          *    longest valid lifetime among the corresponding
 725          *    addresses on the device.
 726          *    Note: subsequent RA will update lifetime.
 727          *
 728          * --yoshfuji
 729          */
 730         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 731                 struct in6_addr prefix;
 732                 struct rt6_info *rt;
 733
 734                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 735                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
 736
 737                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
 738                         if (onlink == 0) {
 739                                 ip6_del_rt(rt);
 740                                 rt = NULL;
 741                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 742                                 rt->rt6i_expires = expires;
 743                                 rt->rt6i_flags |= RTF_EXPIRES;
 744                         }
 745                 }
 746                 dst_release(&rt->u.dst);
 747         }
 748
 749         in6_ifa_put(ifp);
 750 }
 751
 752 #ifdef CONFIG_IPV6_PRIVACY
 753 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 754 {
 755         struct inet6_dev *idev = ifp->idev;
 756         struct in6_addr addr, *tmpaddr;
 757         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
 758         int tmp_plen;
 759         int ret = 0;
 760         int max_addresses;
 761
 762         write_lock(&idev->lock);
 763         if (ift) {
 764                 spin_lock_bh(&ift->lock);
 765                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 766                 spin_unlock_bh(&ift->lock);
 767                 tmpaddr = &addr;
 768         } else {
 769                 tmpaddr = NULL;
 770         }
 771 retry:
 772         in6_dev_hold(idev);
 773         if (idev->cnf.use_tempaddr <= 0) {
 774                 write_unlock(&idev->lock);
 775                 printk(KERN_INFO
 776                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
 777                 in6_dev_put(idev);
 778                 ret = -1;
 779                 goto out;
 780         }
 781         spin_lock_bh(&ifp->lock);
 782         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 783                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 784                 spin_unlock_bh(&ifp->lock);
 785                 write_unlock(&idev->lock);
 786                 printk(KERN_WARNING
 787                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
 788                 in6_dev_put(idev);
 789                 ret = -1;
 790                 goto out;
 791         }
 792         in6_ifa_hold(ifp);
 793         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 794         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
 795                 spin_unlock_bh(&ifp->lock);
 796                 write_unlock(&idev->lock);
 797                 printk(KERN_WARNING
 798                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
 799                 in6_ifa_put(ifp);
 800                 in6_dev_put(idev);
 801                 ret = -1;
 802                 goto out;
 803         }
 804         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 805         tmp_valid_lft = min_t(__u32,
 806                               ifp->valid_lft,
 807                               idev->cnf.temp_valid_lft);
 808         tmp_prefered_lft = min_t(__u32,
 809                                  ifp->prefered_lft,
 810                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
 811         tmp_plen = ifp->prefix_len;
 812         max_addresses = idev->cnf.max_addresses;
 813         tmp_cstamp = ifp->cstamp;
 814         tmp_tstamp = ifp->tstamp;
 815         spin_unlock_bh(&ifp->lock);
 816
 817         write_unlock(&idev->lock);
 818         ift = !max_addresses ||
 819               ipv6_count_addresses(idev) < max_addresses ?
 820                 ipv6_add_addr(idev, &addr, tmp_plen,
 821                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
 822         if (!ift || IS_ERR(ift)) {
 823                 in6_ifa_put(ifp);
 824                 in6_dev_put(idev);
 825                 printk(KERN_INFO
 826                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
 827                 tmpaddr = &addr;
 828                 write_lock(&idev->lock);
 829                 goto retry;
 830         }
 831
 832         spin_lock_bh(&ift->lock);
 833         ift->ifpub = ifp;
 834         ift->valid_lft = tmp_valid_lft;
 835         ift->prefered_lft = tmp_prefered_lft;
 836         ift->cstamp = tmp_cstamp;
 837         ift->tstamp = tmp_tstamp;
 838         spin_unlock_bh(&ift->lock);
 839
 840         addrconf_dad_start(ift, 0);
 841         in6_ifa_put(ift);
 842         in6_dev_put(idev);
 843 out:
 844         return ret;
 845 }
 846 #endif
 847
 848 /*
 849  *      Choose an appropriate source address (RFC3484)
 850  */
 851 struct ipv6_saddr_score {
 852         int             addr_type;
 853         unsigned int    attrs;
 854         int             matchlen;
 855         int             scope;
 856         unsigned int    rule;
 857 };
 858
 859 #define IPV6_SADDR_SCORE_LOCAL          0x0001
 860 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
 861 #define IPV6_SADDR_SCORE_HOA            0x0008
 862 #define IPV6_SADDR_SCORE_OIF            0x0010
 863 #define IPV6_SADDR_SCORE_LABEL          0x0020
 864 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
 865
 866 static int inline ipv6_saddr_preferred(int type)
 867 {
 868         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
 869                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
 870                 return 1;
 871         return 0;
 872 }
 873
 874 /* static matching label */
 875 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
 876 {
 877  /*
 878   *     prefix (longest match)  label
 879   *     -----------------------------
 880   *     ::1/128                 0
 881   *     ::/0                    1
 882   *     2002::/16               2
 883   *     ::/96                   3
 884   *     ::ffff:0:0/96           4
 885   *     fc00::/7                5
 886   *     2001::/32               6
 887   */
 888         if (type & IPV6_ADDR_LOOPBACK)
 889                 return 0;
 890         else if (type & IPV6_ADDR_COMPATv4)
 891                 return 3;
 892         else if (type & IPV6_ADDR_MAPPED)
 893                 return 4;
 894         else if (addr->s6_addr32[0] == htonl(0x20010000))
 895                 return 6;
 896         else if (addr->s6_addr16[0] == htons(0x2002))
 897                 return 2;
 898         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
 899                 return 5;
 900         return 1;
 901 }
 902
 903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
 904                        struct in6_addr *daddr, struct in6_addr *saddr)
 905 {
 906         struct ipv6_saddr_score hiscore;
 907         struct inet6_ifaddr *ifa_result = NULL;
 908         int daddr_type = __ipv6_addr_type(daddr);
 909         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
 910         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
 911         struct net_device *dev;
 912
 913         memset(&hiscore, 0, sizeof(hiscore));
 914
 915         read_lock(&dev_base_lock);
 916         read_lock(&addrconf_lock);
 917
 918         for (dev = dev_base; dev; dev=dev->next) {
 919                 struct inet6_dev *idev;
 920                 struct inet6_ifaddr *ifa;
 921
 922                 /* Rule 0: Candidate Source Address (section 4)
 923                  *  - multicast and link-local destination address,
 924                  *    the set of candidate source address MUST only
 925                  *    include addresses assigned to interfaces
 926                  *    belonging to the same link as the outgoing
 927                  *    interface.
 928                  * (- For site-local destination addresses, the
 929                  *    set of candidate source addresses MUST only
 930                  *    include addresses assigned to interfaces
 931                  *    belonging to the same site as the outgoing
 932                  *    interface.)
 933                  */
 934                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
 935                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
 936                     daddr_dev && dev != daddr_dev)
 937                         continue;
 938
 939                 idev = __in6_dev_get(dev);
 940                 if (!idev)
 941                         continue;
 942
 943                 read_lock_bh(&idev->lock);
 944                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
 945                         struct ipv6_saddr_score score;
 946
 947                         score.addr_type = __ipv6_addr_type(&ifa->addr);
 948
 949                         /* Rule 0:
 950                          * - Tentative Address (RFC2462 section 5.4)
 951                          *  - A tentative address is not considered
 952                          *    "assigned to an interface" in the traditional
 953                          *    sense.
 954                          * - Candidate Source Address (section 4)
 955                          *  - In any case, anycast addresses, multicast
 956                          *    addresses, and the unspecified address MUST
 957                          *    NOT be included in a candidate set.
 958                          */
 959                         if (ifa->flags & IFA_F_TENTATIVE)
 960                                 continue;
 961                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
 962                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
 963                                 LIMIT_NETDEBUG(KERN_DEBUG
 964                                                "ADDRCONF: unspecified / multicast address"
 965                                                "assigned as unicast address on %s",
 966                                                dev->name);
 967                                 continue;
 968                         }
 969
 970                         score.attrs = 0;
 971                         score.matchlen = 0;
 972                         score.scope = 0;
 973                         score.rule = 0;
 974
 975                         if (ifa_result == NULL) {
 976                                 /* record it if the first available entry */
 977                                 goto record_it;
 978                         }
 979
 980                         /* Rule 1: Prefer same address */
 981                         if (hiscore.rule < 1) {
 982                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
 983                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
 984                                 hiscore.rule++;
 985                         }
 986                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
 987                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
 988                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
 989                                         score.rule = 1;
 990                                         goto record_it;
 991                                 }
 992                         } else {
 993                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
 994                                         continue;
 995                         }
 996
 997                         /* Rule 2: Prefer appropriate scope */
 998                         if (hiscore.rule < 2) {
 999                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1000                                 hiscore.rule++;
1001                         }
1002                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1003                         if (hiscore.scope < score.scope) {
1004                                 if (hiscore.scope < daddr_scope) {
1005                                         score.rule = 2;
1006                                         goto record_it;
1007                                 } else
1008                                         continue;
1009                         } else if (score.scope < hiscore.scope) {
1010                                 if (score.scope < daddr_scope)
1011                                         break; /* addresses sorted by scope */
1012                                 else {
1013                                         score.rule = 2;
1014                                         goto record_it;
1015                                 }
1016                         }
1017
1018                         /* Rule 3: Avoid deprecated address */
1019                         if (hiscore.rule < 3) {
1020                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1021                                     !(ifa_result->flags & IFA_F_DEPRECATED))
1022                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1023                                 hiscore.rule++;
1024                         }
1025                         if (ipv6_saddr_preferred(score.addr_type) ||
1026                             !(ifa->flags & IFA_F_DEPRECATED)) {
1027                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1028                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1029                                         score.rule = 3;
1030                                         goto record_it;
1031                                 }
1032                         } else {
1033                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1034                                         continue;
1035                         }
1036
1037                         /* Rule 4: Prefer home address -- not implemented yet */
1038                         if (hiscore.rule < 4)
1039                                 hiscore.rule++;
1040
1041                         /* Rule 5: Prefer outgoing interface */
1042                         if (hiscore.rule < 5) {
1043                                 if (daddr_dev == NULL ||
1044                                     daddr_dev == ifa_result->idev->dev)
1045                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1046                                 hiscore.rule++;
1047                         }
1048                         if (daddr_dev == NULL ||
1049                             daddr_dev == ifa->idev->dev) {
1050                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1051                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1052                                         score.rule = 5;
1053                                         goto record_it;
1054                                 }
1055                         } else {
1056                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1057                                         continue;
1058                         }
1059
1060                         /* Rule 6: Prefer matching label */
1061                         if (hiscore.rule < 6) {
1062                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1063                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1064                                 hiscore.rule++;
1065                         }
1066                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1067                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1068                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1069                                         score.rule = 6;
1070                                         goto record_it;
1071                                 }
1072                         } else {
1073                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1074                                         continue;
1075                         }
1076
1077 #ifdef CONFIG_IPV6_PRIVACY
1078                         /* Rule 7: Prefer public address
1079                          * Note: prefer temprary address if use_tempaddr >= 2
1080                          */
1081                         if (hiscore.rule < 7) {
1082                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1083                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1084                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1085                                 hiscore.rule++;
1086                         }
1087                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1088                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1089                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1090                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1091                                         score.rule = 7;
1092                                         goto record_it;
1093                                 }
1094                         } else {
1095                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1096                                         continue;
1097                         }
1098 #else
1099                         if (hiscore.rule < 7)
1100                                 hiscore.rule++;
1101 #endif
1102                         /* Rule 8: Use longest matching prefix */
1103                         if (hiscore.rule < 8) {
1104                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1105                                 hiscore.rule++;
1106                         }
1107                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1108                         if (score.matchlen > hiscore.matchlen) {
1109                                 score.rule = 8;
1110                                 goto record_it;
1111                         }
1112 #if 0
1113                         else if (score.matchlen < hiscore.matchlen)
1114                                 continue;
1115 #endif
1116
1117                         /* Final Rule: choose first available one */
1118                         continue;
1119 record_it:
1120                         if (ifa_result)
1121                                 in6_ifa_put(ifa_result);
1122                         in6_ifa_hold(ifa);
1123                         ifa_result = ifa;
1124                         hiscore = score;
1125                 }
1126                 read_unlock_bh(&idev->lock);
1127         }
1128         read_unlock(&addrconf_lock);
1129         read_unlock(&dev_base_lock);
1130
1131         if (!ifa_result)
1132                 return -EADDRNOTAVAIL;
1133
1134         ipv6_addr_copy(saddr, &ifa_result->addr);
1135         in6_ifa_put(ifa_result);
1136         return 0;
1137 }
1138
1139
1140 int ipv6_get_saddr(struct dst_entry *dst,
1141                    struct in6_addr *daddr, struct in6_addr *saddr)
1142 {
1143         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1144 }
1145
1146
1147 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1148 {
1149         struct inet6_dev *idev;
1150         int err = -EADDRNOTAVAIL;
1151
1152         read_lock(&addrconf_lock);
1153         if ((idev = __in6_dev_get(dev)) != NULL) {
1154                 struct inet6_ifaddr *ifp;
1155
1156                 read_lock_bh(&idev->lock);
1157                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1158                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1159                                 ipv6_addr_copy(addr, &ifp->addr);
1160                                 err = 0;
1161                                 break;
1162                         }
1163                 }
1164                 read_unlock_bh(&idev->lock);
1165         }
1166         read_unlock(&addrconf_lock);
1167         return err;
1168 }
1169
1170 static int ipv6_count_addresses(struct inet6_dev *idev)
1171 {
1172         int cnt = 0;
1173         struct inet6_ifaddr *ifp;
1174
1175         read_lock_bh(&idev->lock);
1176         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1177                 cnt++;
1178         read_unlock_bh(&idev->lock);
1179         return cnt;
1180 }
1181
1182 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1183 {
1184         struct inet6_ifaddr * ifp;
1185         u8 hash = ipv6_addr_hash(addr);
1186
1187         read_lock_bh(&addrconf_hash_lock);
1188         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1189                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1190                     !(ifp->flags&IFA_F_TENTATIVE)) {
1191                         if (dev == NULL || ifp->idev->dev == dev ||
1192                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1193                                 break;
1194                 }
1195         }
1196         read_unlock_bh(&addrconf_hash_lock);
1197         return ifp != NULL;
1198 }
1199
1200 static
1201 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1202 {
1203         struct inet6_ifaddr * ifp;
1204         u8 hash = ipv6_addr_hash(addr);
1205
1206         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1207                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1208                         if (dev == NULL || ifp->idev->dev == dev)
1209                                 break;
1210                 }
1211         }
1212         return ifp != NULL;
1213 }
1214
1215 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1216 {
1217         struct inet6_ifaddr * ifp;
1218         u8 hash = ipv6_addr_hash(addr);
1219
1220         read_lock_bh(&addrconf_hash_lock);
1221         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1222                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1223                         if (dev == NULL || ifp->idev->dev == dev ||
1224                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1225                                 in6_ifa_hold(ifp);
1226                                 break;
1227                         }
1228                 }
1229         }
1230         read_unlock_bh(&addrconf_hash_lock);
1231
1232         return ifp;
1233 }
1234
1235 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1236 {
1237         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1238         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1239         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1240         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1241         int sk_ipv6only = ipv6_only_sock(sk);
1242         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1243         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1244         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1245
1246         if (!sk2_rcv_saddr && !sk_ipv6only)
1247                 return 1;
1248
1249         if (addr_type2 == IPV6_ADDR_ANY &&
1250             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1251                 return 1;
1252
1253         if (addr_type == IPV6_ADDR_ANY &&
1254             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1255                 return 1;
1256
1257         if (sk2_rcv_saddr6 &&
1258             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1259                 return 1;
1260
1261         if (addr_type == IPV6_ADDR_MAPPED &&
1262             !sk2_ipv6only &&
1263             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1264                 return 1;
1265
1266         return 0;
1267 }
1268
1269 /* Gets referenced address, destroys ifaddr */
1270
1271 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1272 {
1273         if (ifp->flags&IFA_F_PERMANENT) {
1274                 spin_lock_bh(&ifp->lock);
1275                 addrconf_del_timer(ifp);
1276                 ifp->flags |= IFA_F_TENTATIVE;
1277                 spin_unlock_bh(&ifp->lock);
1278                 in6_ifa_put(ifp);
1279 #ifdef CONFIG_IPV6_PRIVACY
1280         } else if (ifp->flags&IFA_F_TEMPORARY) {
1281                 struct inet6_ifaddr *ifpub;
1282                 spin_lock_bh(&ifp->lock);
1283                 ifpub = ifp->ifpub;
1284                 if (ifpub) {
1285                         in6_ifa_hold(ifpub);
1286                         spin_unlock_bh(&ifp->lock);
1287                         ipv6_create_tempaddr(ifpub, ifp);
1288                         in6_ifa_put(ifpub);
1289                 } else {
1290                         spin_unlock_bh(&ifp->lock);
1291                 }
1292                 ipv6_del_addr(ifp);
1293 #endif
1294         } else
1295                 ipv6_del_addr(ifp);
1296 }
1297
1298 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1299 {
1300         if (net_ratelimit())
1301                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1302         addrconf_dad_stop(ifp);
1303 }
1304
1305 /* Join to solicited addr multicast group. */
1306
1307 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1308 {
1309         struct in6_addr maddr;
1310
1311         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1312                 return;
1313
1314         addrconf_addr_solict_mult(addr, &maddr);
1315         ipv6_dev_mc_inc(dev, &maddr);
1316 }
1317
1318 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1319 {
1320         struct in6_addr maddr;
1321
1322         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1323                 return;
1324
1325         addrconf_addr_solict_mult(addr, &maddr);
1326         __ipv6_dev_mc_dec(idev, &maddr);
1327 }
1328
1329 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1330 {
1331         struct in6_addr addr;
1332         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1333         if (ipv6_addr_any(&addr))
1334                 return;
1335         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1336 }
1337
1338 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1339 {
1340         struct in6_addr addr;
1341         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1342         if (ipv6_addr_any(&addr))
1343                 return;
1344         __ipv6_dev_ac_dec(ifp->idev, &addr);
1345 }
1346
1347 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1348 {
1349         if (dev->addr_len != ETH_ALEN)
1350                 return -1;
1351         memcpy(eui, dev->dev_addr, 3);
1352         memcpy(eui + 5, dev->dev_addr + 3, 3);
1353
1354         /*
1355          * The zSeries OSA network cards can be shared among various
1356          * OS instances, but the OSA cards have only one MAC address.
1357          * This leads to duplicate address conflicts in conjunction
1358          * with IPv6 if more than one instance uses the same card.
1359          *
1360          * The driver for these cards can deliver a unique 16-bit
1361          * identifier for each instance sharing the same card.  It is
1362          * placed instead of 0xFFFE in the interface identifier.  The
1363          * "u" bit of the interface identifier is not inverted in this
1364          * case.  Hence the resulting interface identifier has local
1365          * scope according to RFC2373.
1366          */
1367         if (dev->dev_id) {
1368                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1369                 eui[4] = dev->dev_id & 0xFF;
1370         } else {
1371                 eui[3] = 0xFF;
1372                 eui[4] = 0xFE;
1373                 eui[0] ^= 2;
1374         }
1375         return 0;
1376 }
1377
1378 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1379 {
1380         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1381         if (dev->addr_len != ARCNET_ALEN)
1382                 return -1;
1383         memset(eui, 0, 7);
1384         eui[7] = *(u8*)dev->dev_addr;
1385         return 0;
1386 }
1387
1388 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1389 {
1390         if (dev->addr_len != INFINIBAND_ALEN)
1391                 return -1;
1392         memcpy(eui, dev->dev_addr + 12, 8);
1393         eui[0] |= 2;
1394         return 0;
1395 }
1396
1397 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1398 {
1399         switch (dev->type) {
1400         case ARPHRD_ETHER:
1401         case ARPHRD_FDDI:
1402         case ARPHRD_IEEE802_TR:
1403                 return addrconf_ifid_eui48(eui, dev);
1404         case ARPHRD_ARCNET:
1405                 return addrconf_ifid_arcnet(eui, dev);
1406         case ARPHRD_INFINIBAND:
1407                 return addrconf_ifid_infiniband(eui, dev);
1408         }
1409         return -1;
1410 }
1411
1412 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1413 {
1414         int err = -1;
1415         struct inet6_ifaddr *ifp;
1416
1417         read_lock_bh(&idev->lock);
1418         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1419                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1420                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1421                         err = 0;
1422                         break;
1423                 }
1424         }
1425         read_unlock_bh(&idev->lock);
1426         return err;
1427 }
1428
1429 #ifdef CONFIG_IPV6_PRIVACY
1430 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1431 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1432 {
1433 regen:
1434         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1435         idev->rndid[0] &= ~0x02;
1436
1437         /*
1438          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1439          * check if generated address is not inappropriate
1440          *
1441          *  - Reserved subnet anycast (RFC 2526)
1442          *      11111101 11....11 1xxxxxxx
1443          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1444          *      00-00-5E-FE-xx-xx-xx-xx
1445          *  - value 0
1446          *  - XXX: already assigned to an address on the device
1447          */
1448         if (idev->rndid[0] == 0xfd &&
1449             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1450             (idev->rndid[7]&0x80))
1451                 goto regen;
1452         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1453                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1454                         goto regen;
1455                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1456                         goto regen;
1457         }
1458
1459         return 0;
1460 }
1461
1462 static void ipv6_regen_rndid(unsigned long data)
1463 {
1464         struct inet6_dev *idev = (struct inet6_dev *) data;
1465         unsigned long expires;
1466
1467         read_lock_bh(&addrconf_lock);
1468         write_lock_bh(&idev->lock);
1469
1470         if (idev->dead)
1471                 goto out;
1472
1473         if (__ipv6_regen_rndid(idev) < 0)
1474                 goto out;
1475
1476         expires = jiffies +
1477                 idev->cnf.temp_prefered_lft * HZ -
1478                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1479         if (time_before(expires, jiffies)) {
1480                 printk(KERN_WARNING
1481                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1482                         idev->dev->name);
1483                 goto out;
1484         }
1485
1486         if (!mod_timer(&idev->regen_timer, expires))
1487                 in6_dev_hold(idev);
1488
1489 out:
1490         write_unlock_bh(&idev->lock);
1491         read_unlock_bh(&addrconf_lock);
1492         in6_dev_put(idev);
1493 }
1494
1495 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1496         int ret = 0;
1497
1498         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1499                 ret = __ipv6_regen_rndid(idev);
1500         return ret;
1501 }
1502 #endif
1503
1504 /*
1505  *      Add prefix route.
1506  */
1507
1508 static void
1509 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1510                       unsigned long expires, u32 flags)
1511 {
1512         struct in6_rtmsg rtmsg;
1513
1514         memset(&rtmsg, 0, sizeof(rtmsg));
1515         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1516         rtmsg.rtmsg_dst_len = plen;
1517         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1518         rtmsg.rtmsg_ifindex = dev->ifindex;
1519         rtmsg.rtmsg_info = expires;
1520         rtmsg.rtmsg_flags = RTF_UP|flags;
1521         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1522
1523         /* Prevent useless cloning on PtP SIT.
1524            This thing is done here expecting that the whole
1525            class of non-broadcast devices need not cloning.
1526          */
1527         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1528                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1529
1530         ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_PREFIX);
1531 }
1532
1533 /* Create "default" multicast route to the interface */
1534
1535 static void addrconf_add_mroute(struct net_device *dev)
1536 {
1537         struct in6_rtmsg rtmsg;
1538
1539         memset(&rtmsg, 0, sizeof(rtmsg));
1540         ipv6_addr_set(&rtmsg.rtmsg_dst,
1541                       htonl(0xFF000000), 0, 0, 0);
1542         rtmsg.rtmsg_dst_len = 8;
1543         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1544         rtmsg.rtmsg_ifindex = dev->ifindex;
1545         rtmsg.rtmsg_flags = RTF_UP;
1546         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1547         ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_LOCAL);
1548 }
1549
1550 static void sit_route_add(struct net_device *dev)
1551 {
1552         struct in6_rtmsg rtmsg;
1553
1554         memset(&rtmsg, 0, sizeof(rtmsg));
1555
1556         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1557         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1558
1559         /* prefix length - 96 bits "::d.d.d.d" */
1560         rtmsg.rtmsg_dst_len     = 96;
1561         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1562         rtmsg.rtmsg_ifindex     = dev->ifindex;
1563
1564         ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_MAIN);
1565 }
1566
1567 static void addrconf_add_lroute(struct net_device *dev)
1568 {
1569         struct in6_addr addr;
1570
1571         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1572         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1573 }
1574
1575 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1576 {
1577         struct inet6_dev *idev;
1578
1579         ASSERT_RTNL();
1580
1581         if ((idev = ipv6_find_idev(dev)) == NULL)
1582                 return NULL;
1583
1584         /* Add default multicast route */
1585         addrconf_add_mroute(dev);
1586
1587         /* Add link local route */
1588         addrconf_add_lroute(dev);
1589         return idev;
1590 }
1591
1592 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1593 {
1594         struct prefix_info *pinfo;
1595         __u32 valid_lft;
1596         __u32 prefered_lft;
1597         int addr_type;
1598         unsigned long rt_expires;
1599         struct inet6_dev *in6_dev;
1600
1601         pinfo = (struct prefix_info *) opt;
1602
1603         if (len < sizeof(struct prefix_info)) {
1604                 ADBG(("addrconf: prefix option too short\n"));
1605                 return;
1606         }
1607
1608         /*
1609          *      Validation checks ([ADDRCONF], page 19)
1610          */
1611
1612         addr_type = ipv6_addr_type(&pinfo->prefix);
1613
1614         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1615                 return;
1616
1617         valid_lft = ntohl(pinfo->valid);
1618         prefered_lft = ntohl(pinfo->prefered);
1619
1620         if (prefered_lft > valid_lft) {
1621                 if (net_ratelimit())
1622                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1623                 return;
1624         }
1625
1626         in6_dev = in6_dev_get(dev);
1627
1628         if (in6_dev == NULL) {
1629                 if (net_ratelimit())
1630                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1631                 return;
1632         }
1633
1634         /*
1635          *      Two things going on here:
1636          *      1) Add routes for on-link prefixes
1637          *      2) Configure prefixes with the auto flag set
1638          */
1639
1640         /* Avoid arithmetic overflow. Really, we could
1641            save rt_expires in seconds, likely valid_lft,
1642            but it would require division in fib gc, that it
1643            not good.
1644          */
1645         if (valid_lft >= 0x7FFFFFFF/HZ)
1646                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1647         else
1648                 rt_expires = valid_lft * HZ;
1649
1650         /*
1651          * We convert this (in jiffies) to clock_t later.
1652          * Avoid arithmetic overflow there as well.
1653          * Overflow can happen only if HZ < USER_HZ.
1654          */
1655         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1656                 rt_expires = 0x7FFFFFFF / USER_HZ;
1657
1658         if (pinfo->onlink) {
1659                 struct rt6_info *rt;
1660                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1661
1662                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1663                         if (rt->rt6i_flags&RTF_EXPIRES) {
1664                                 if (valid_lft == 0) {
1665                                         ip6_del_rt(rt);
1666                                         rt = NULL;
1667                                 } else {
1668                                         rt->rt6i_expires = jiffies + rt_expires;
1669                                 }
1670                         }
1671                 } else if (valid_lft) {
1672                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1673                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1674                 }
1675                 if (rt)
1676                         dst_release(&rt->u.dst);
1677         }
1678
1679         /* Try to figure out our local address for this prefix */
1680
1681         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1682                 struct inet6_ifaddr * ifp;
1683                 struct in6_addr addr;
1684                 int create = 0, update_lft = 0;
1685
1686                 if (pinfo->prefix_len == 64) {
1687                         memcpy(&addr, &pinfo->prefix, 8);
1688                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1689                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1690                                 in6_dev_put(in6_dev);
1691                                 return;
1692                         }
1693                         goto ok;
1694                 }
1695                 if (net_ratelimit())
1696                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1697                                pinfo->prefix_len);
1698                 in6_dev_put(in6_dev);
1699                 return;
1700
1701 ok:
1702
1703                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1704
1705                 if (ifp == NULL && valid_lft) {
1706                         int max_addresses = in6_dev->cnf.max_addresses;
1707
1708                         /* Do not allow to create too much of autoconfigured
1709                          * addresses; this would be too easy way to crash kernel.
1710                          */
1711                         if (!max_addresses ||
1712                             ipv6_count_addresses(in6_dev) < max_addresses)
1713                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1714                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1715
1716                         if (!ifp || IS_ERR(ifp)) {
1717                                 in6_dev_put(in6_dev);
1718                                 return;
1719                         }
1720
1721                         update_lft = create = 1;
1722                         ifp->cstamp = jiffies;
1723                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1724                 }
1725
1726                 if (ifp) {
1727                         int flags;
1728                         unsigned long now;
1729 #ifdef CONFIG_IPV6_PRIVACY
1730                         struct inet6_ifaddr *ift;
1731 #endif
1732                         u32 stored_lft;
1733
1734                         /* update lifetime (RFC2462 5.5.3 e) */
1735                         spin_lock(&ifp->lock);
1736                         now = jiffies;
1737                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1738                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1739                         else
1740                                 stored_lft = 0;
1741                         if (!update_lft && stored_lft) {
1742                                 if (valid_lft > MIN_VALID_LIFETIME ||
1743                                     valid_lft > stored_lft)
1744                                         update_lft = 1;
1745                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1746                                         /* valid_lft <= stored_lft is always true */
1747                                         /* XXX: IPsec */
1748                                         update_lft = 0;
1749                                 } else {
1750                                         valid_lft = MIN_VALID_LIFETIME;
1751                                         if (valid_lft < prefered_lft)
1752                                                 prefered_lft = valid_lft;
1753                                         update_lft = 1;
1754                                 }
1755                         }
1756
1757                         if (update_lft) {
1758                                 ifp->valid_lft = valid_lft;
1759                                 ifp->prefered_lft = prefered_lft;
1760                                 ifp->tstamp = now;
1761                                 flags = ifp->flags;
1762                                 ifp->flags &= ~IFA_F_DEPRECATED;
1763                                 spin_unlock(&ifp->lock);
1764
1765                                 if (!(flags&IFA_F_TENTATIVE))
1766                                         ipv6_ifa_notify(0, ifp);
1767                         } else
1768                                 spin_unlock(&ifp->lock);
1769
1770 #ifdef CONFIG_IPV6_PRIVACY
1771                         read_lock_bh(&in6_dev->lock);
1772                         /* update all temporary addresses in the list */
1773                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1774                                 /*
1775                                  * When adjusting the lifetimes of an existing
1776                                  * temporary address, only lower the lifetimes.
1777                                  * Implementations must not increase the
1778                                  * lifetimes of an existing temporary address
1779                                  * when processing a Prefix Information Option.
1780                                  */
1781                                 spin_lock(&ift->lock);
1782                                 flags = ift->flags;
1783                                 if (ift->valid_lft > valid_lft &&
1784                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1785                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1786                                 if (ift->prefered_lft > prefered_lft &&
1787                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1788                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1789                                 spin_unlock(&ift->lock);
1790                                 if (!(flags&IFA_F_TENTATIVE))
1791                                         ipv6_ifa_notify(0, ift);
1792                         }
1793
1794                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1795                                 /*
1796                                  * When a new public address is created as described in [ADDRCONF],
1797                                  * also create a new temporary address.
1798                                  */
1799                                 read_unlock_bh(&in6_dev->lock);
1800                                 ipv6_create_tempaddr(ifp, NULL);
1801                         } else {
1802                                 read_unlock_bh(&in6_dev->lock);
1803                         }
1804 #endif
1805                         in6_ifa_put(ifp);
1806                         addrconf_verify(0);
1807                 }
1808         }
1809         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1810         in6_dev_put(in6_dev);
1811 }
1812
1813 /*
1814  *      Set destination address.
1815  *      Special case for SIT interfaces where we create a new "virtual"
1816  *      device.
1817  */
1818 int addrconf_set_dstaddr(void __user *arg)
1819 {
1820         struct in6_ifreq ireq;
1821         struct net_device *dev;
1822         int err = -EINVAL;
1823
1824         rtnl_lock();
1825
1826         err = -EFAULT;
1827         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1828                 goto err_exit;
1829
1830         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1831
1832         err = -ENODEV;
1833         if (dev == NULL)
1834                 goto err_exit;
1835
1836         if (dev->type == ARPHRD_SIT) {
1837                 struct ifreq ifr;
1838                 mm_segment_t    oldfs;
1839                 struct ip_tunnel_parm p;
1840
1841                 err = -EADDRNOTAVAIL;
1842                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1843                         goto err_exit;
1844
1845                 memset(&p, 0, sizeof(p));
1846                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1847                 p.iph.saddr = 0;
1848                 p.iph.version = 4;
1849                 p.iph.ihl = 5;
1850                 p.iph.protocol = IPPROTO_IPV6;
1851                 p.iph.ttl = 64;
1852                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1853
1854                 oldfs = get_fs(); set_fs(KERNEL_DS);
1855                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1856                 set_fs(oldfs);
1857
1858                 if (err == 0) {
1859                         err = -ENOBUFS;
1860                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1861                                 goto err_exit;
1862                         err = dev_open(dev);
1863                 }
1864         }
1865
1866 err_exit:
1867         rtnl_unlock();
1868         return err;
1869 }
1870
1871 /*
1872  *      Manual configuration of address on an interface
1873  */
1874 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1875                           __u32 prefered_lft, __u32 valid_lft)
1876 {
1877         struct inet6_ifaddr *ifp;
1878         struct inet6_dev *idev;
1879         struct net_device *dev;
1880         __u8 ifa_flags = 0;
1881         int scope;
1882
1883         ASSERT_RTNL();
1884
1885         /* check the lifetime */
1886         if (!valid_lft || prefered_lft > valid_lft)
1887                 return -EINVAL;
1888
1889         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1890                 return -ENODEV;
1891
1892         if (!(dev->flags&IFF_UP))
1893                 return -ENETDOWN;
1894
1895         if ((idev = addrconf_add_dev(dev)) == NULL)
1896                 return -ENOBUFS;
1897
1898         scope = ipv6_addr_scope(pfx);
1899
1900         if (valid_lft == INFINITY_LIFE_TIME)
1901                 ifa_flags |= IFA_F_PERMANENT;
1902         else if (valid_lft >= 0x7FFFFFFF/HZ)
1903                 valid_lft = 0x7FFFFFFF/HZ;
1904
1905         if (prefered_lft == 0)
1906                 ifa_flags |= IFA_F_DEPRECATED;
1907         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1908                  (prefered_lft != INFINITY_LIFE_TIME))
1909                 prefered_lft = 0x7FFFFFFF/HZ;
1910
1911         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1912
1913         if (!IS_ERR(ifp)) {
1914                 spin_lock_bh(&ifp->lock);
1915                 ifp->valid_lft = valid_lft;
1916                 ifp->prefered_lft = prefered_lft;
1917                 ifp->tstamp = jiffies;
1918                 spin_unlock_bh(&ifp->lock);
1919
1920                 addrconf_dad_start(ifp, 0);
1921                 in6_ifa_put(ifp);
1922                 addrconf_verify(0);
1923                 return 0;
1924         }
1925
1926         return PTR_ERR(ifp);
1927 }
1928
1929 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1930 {
1931         struct inet6_ifaddr *ifp;
1932         struct inet6_dev *idev;
1933         struct net_device *dev;
1934
1935         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1936                 return -ENODEV;
1937
1938         if ((idev = __in6_dev_get(dev)) == NULL)
1939                 return -ENXIO;
1940
1941         read_lock_bh(&idev->lock);
1942         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1943                 if (ifp->prefix_len == plen &&
1944                     ipv6_addr_equal(pfx, &ifp->addr)) {
1945                         in6_ifa_hold(ifp);
1946                         read_unlock_bh(&idev->lock);
1947
1948                         ipv6_del_addr(ifp);
1949
1950                         /* If the last address is deleted administratively,
1951                            disable IPv6 on this interface.
1952                          */
1953                         if (idev->addr_list == NULL)
1954                                 addrconf_ifdown(idev->dev, 1);
1955                         return 0;
1956                 }
1957         }
1958         read_unlock_bh(&idev->lock);
1959         return -EADDRNOTAVAIL;
1960 }
1961
1962
1963 int addrconf_add_ifaddr(void __user *arg)
1964 {
1965         struct in6_ifreq ireq;
1966         int err;
1967
1968         if (!capable(CAP_NET_ADMIN))
1969                 return -EPERM;
1970
1971         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1972                 return -EFAULT;
1973
1974         rtnl_lock();
1975         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1976                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1977         rtnl_unlock();
1978         return err;
1979 }
1980
1981 int addrconf_del_ifaddr(void __user *arg)
1982 {
1983         struct in6_ifreq ireq;
1984         int err;
1985
1986         if (!capable(CAP_NET_ADMIN))
1987                 return -EPERM;
1988
1989         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1990                 return -EFAULT;
1991
1992         rtnl_lock();
1993         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1994         rtnl_unlock();
1995         return err;
1996 }
1997
1998 static void sit_add_v4_addrs(struct inet6_dev *idev)
1999 {
2000         struct inet6_ifaddr * ifp;
2001         struct in6_addr addr;
2002         struct net_device *dev;
2003         int scope;
2004
2005         ASSERT_RTNL();
2006
2007         memset(&addr, 0, sizeof(struct in6_addr));
2008         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2009
2010         if (idev->dev->flags&IFF_POINTOPOINT) {
2011                 addr.s6_addr32[0] = htonl(0xfe800000);
2012                 scope = IFA_LINK;
2013         } else {
2014                 scope = IPV6_ADDR_COMPATv4;
2015         }
2016
2017         if (addr.s6_addr32[3]) {
2018                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2019                 if (!IS_ERR(ifp)) {
2020                         spin_lock_bh(&ifp->lock);
2021                         ifp->flags &= ~IFA_F_TENTATIVE;
2022                         spin_unlock_bh(&ifp->lock);
2023                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2024                         in6_ifa_put(ifp);
2025                 }
2026                 return;
2027         }
2028
2029         for (dev = dev_base; dev != NULL; dev = dev->next) {
2030                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2031                 if (in_dev && (dev->flags & IFF_UP)) {
2032                         struct in_ifaddr * ifa;
2033
2034                         int flag = scope;
2035
2036                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2037                                 int plen;
2038
2039                                 addr.s6_addr32[3] = ifa->ifa_local;
2040
2041                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2042                                         continue;
2043                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2044                                         if (idev->dev->flags&IFF_POINTOPOINT)
2045                                                 continue;
2046                                         flag |= IFA_HOST;
2047                                 }
2048                                 if (idev->dev->flags&IFF_POINTOPOINT)
2049                                         plen = 64;
2050                                 else
2051                                         plen = 96;
2052
2053                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2054                                                     IFA_F_PERMANENT);
2055                                 if (!IS_ERR(ifp)) {
2056                                         spin_lock_bh(&ifp->lock);
2057                                         ifp->flags &= ~IFA_F_TENTATIVE;
2058                                         spin_unlock_bh(&ifp->lock);
2059                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2060                                         in6_ifa_put(ifp);
2061                                 }
2062                         }
2063                 }
2064         }
2065 }
2066
2067 static void init_loopback(struct net_device *dev)
2068 {
2069         struct inet6_dev  *idev;
2070         struct inet6_ifaddr * ifp;
2071
2072         /* ::1 */
2073
2074         ASSERT_RTNL();
2075
2076         if ((idev = ipv6_find_idev(dev)) == NULL) {
2077                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2078                 return;
2079         }
2080
2081         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2082         if (!IS_ERR(ifp)) {
2083                 spin_lock_bh(&ifp->lock);
2084                 ifp->flags &= ~IFA_F_TENTATIVE;
2085                 spin_unlock_bh(&ifp->lock);
2086                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2087                 in6_ifa_put(ifp);
2088         }
2089 }
2090
2091 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2092 {
2093         struct inet6_ifaddr * ifp;
2094
2095         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2096         if (!IS_ERR(ifp)) {
2097                 addrconf_dad_start(ifp, 0);
2098                 in6_ifa_put(ifp);
2099         }
2100 }
2101
2102 static void addrconf_dev_config(struct net_device *dev)
2103 {
2104         struct in6_addr addr;
2105         struct inet6_dev    * idev;
2106
2107         ASSERT_RTNL();
2108
2109         if ((dev->type != ARPHRD_ETHER) &&
2110             (dev->type != ARPHRD_FDDI) &&
2111             (dev->type != ARPHRD_IEEE802_TR) &&
2112             (dev->type != ARPHRD_ARCNET) &&
2113             (dev->type != ARPHRD_INFINIBAND)) {
2114                 /* Alas, we support only Ethernet autoconfiguration. */
2115                 return;
2116         }
2117
2118         idev = addrconf_add_dev(dev);
2119         if (idev == NULL)
2120                 return;
2121
2122         memset(&addr, 0, sizeof(struct in6_addr));
2123         addr.s6_addr32[0] = htonl(0xFE800000);
2124
2125         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2126                 addrconf_add_linklocal(idev, &addr);
2127 }
2128
2129 static void addrconf_sit_config(struct net_device *dev)
2130 {
2131         struct inet6_dev *idev;
2132
2133         ASSERT_RTNL();
2134
2135         /*
2136          * Configure the tunnel with one of our IPv4
2137          * addresses... we should configure all of
2138          * our v4 addrs in the tunnel
2139          */
2140
2141         if ((idev = ipv6_find_idev(dev)) == NULL) {
2142                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2143                 return;
2144         }
2145
2146         sit_add_v4_addrs(idev);
2147
2148         if (dev->flags&IFF_POINTOPOINT) {
2149                 addrconf_add_mroute(dev);
2150                 addrconf_add_lroute(dev);
2151         } else
2152                 sit_route_add(dev);
2153 }
2154
2155 static inline int
2156 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2157 {
2158         struct in6_addr lladdr;
2159
2160         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2161                 addrconf_add_linklocal(idev, &lladdr);
2162                 return 0;
2163         }
2164         return -1;
2165 }
2166
2167 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2168 {
2169         struct net_device *link_dev;
2170
2171         /* first try to inherit the link-local address from the link device */
2172         if (idev->dev->iflink &&
2173             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2174                 if (!ipv6_inherit_linklocal(idev, link_dev))
2175                         return;
2176         }
2177         /* then try to inherit it from any device */
2178         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2179                 if (!ipv6_inherit_linklocal(idev, link_dev))
2180                         return;
2181         }
2182         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2183 }
2184
2185 /*
2186  * Autoconfigure tunnel with a link-local address so routing protocols,
2187  * DHCPv6, MLD etc. can be run over the virtual link
2188  */
2189
2190 static void addrconf_ip6_tnl_config(struct net_device *dev)
2191 {
2192         struct inet6_dev *idev;
2193
2194         ASSERT_RTNL();
2195
2196         if ((idev = addrconf_add_dev(dev)) == NULL) {
2197                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2198                 return;
2199         }
2200         ip6_tnl_add_linklocal(idev);
2201 }
2202
2203 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2204                            void * data)
2205 {
2206         struct net_device *dev = (struct net_device *) data;
2207         struct inet6_dev *idev = __in6_dev_get(dev);
2208         int run_pending = 0;
2209
2210         switch(event) {
2211         case NETDEV_UP:
2212         case NETDEV_CHANGE:
2213                 if (event == NETDEV_UP) {
2214                         if (!netif_carrier_ok(dev)) {
2215                                 /* device is not ready yet. */
2216                                 printk(KERN_INFO
2217                                         "ADDRCONF(NETDEV_UP): %s: "
2218                                         "link is not ready\n",
2219                                         dev->name);
2220                                 break;
2221                         }
2222
2223                         if (idev)
2224                                 idev->if_flags |= IF_READY;
2225                 } else {
2226                         if (!netif_carrier_ok(dev)) {
2227                                 /* device is still not ready. */
2228                                 break;
2229                         }
2230
2231                         if (idev) {
2232                                 if (idev->if_flags & IF_READY) {
2233                                         /* device is already configured. */
2234                                         break;
2235                                 }
2236                                 idev->if_flags |= IF_READY;
2237                         }
2238
2239                         printk(KERN_INFO
2240                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2241                                         "link becomes ready\n",
2242                                         dev->name);
2243
2244                         run_pending = 1;
2245                 }
2246
2247                 switch(dev->type) {
2248                 case ARPHRD_SIT:
2249                         addrconf_sit_config(dev);
2250                         break;
2251                 case ARPHRD_TUNNEL6:
2252                         addrconf_ip6_tnl_config(dev);
2253                         break;
2254                 case ARPHRD_LOOPBACK:
2255                         init_loopback(dev);
2256                         break;
2257
2258                 default:
2259                         addrconf_dev_config(dev);
2260                         break;
2261                 };
2262                 if (idev) {
2263                         if (run_pending)
2264                                 addrconf_dad_run(idev);
2265
2266                         /* If the MTU changed during the interface down, when the
2267                            interface up, the changed MTU must be reflected in the
2268                            idev as well as routers.
2269                          */
2270                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2271                                 rt6_mtu_change(dev, dev->mtu);
2272                                 idev->cnf.mtu6 = dev->mtu;
2273                         }
2274                         idev->tstamp = jiffies;
2275                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2276                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2277                            stop IPv6 on this interface.
2278                          */
2279                         if (dev->mtu < IPV6_MIN_MTU)
2280                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2281                 }
2282                 break;
2283
2284         case NETDEV_CHANGEMTU:
2285                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2286                         rt6_mtu_change(dev, dev->mtu);
2287                         idev->cnf.mtu6 = dev->mtu;
2288                         break;
2289                 }
2290
2291                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2292
2293         case NETDEV_DOWN:
2294         case NETDEV_UNREGISTER:
2295                 /*
2296                  *      Remove all addresses from this interface.
2297                  */
2298                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2299                 break;
2300
2301         case NETDEV_CHANGENAME:
2302 #ifdef CONFIG_SYSCTL
2303                 if (idev) {
2304                         addrconf_sysctl_unregister(&idev->cnf);
2305                         neigh_sysctl_unregister(idev->nd_parms);
2306                         neigh_sysctl_register(dev, idev->nd_parms,
2307                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2308                                               &ndisc_ifinfo_sysctl_change,
2309                                               NULL);
2310                         addrconf_sysctl_register(idev, &idev->cnf);
2311                 }
2312 #endif
2313                 break;
2314         };
2315
2316         return NOTIFY_OK;
2317 }
2318
2319 /*
2320  *      addrconf module should be notified of a device going up
2321  */
2322 static struct notifier_block ipv6_dev_notf = {
2323         .notifier_call = addrconf_notify,
2324         .priority = 0
2325 };
2326
2327 static int addrconf_ifdown(struct net_device *dev, int how)
2328 {
2329         struct inet6_dev *idev;
2330         struct inet6_ifaddr *ifa, **bifa;
2331         int i;
2332
2333         ASSERT_RTNL();
2334
2335         if (dev == &loopback_dev && how == 1)
2336                 how = 0;
2337
2338         rt6_ifdown(dev);
2339         neigh_ifdown(&nd_tbl, dev);
2340
2341         idev = __in6_dev_get(dev);
2342         if (idev == NULL)
2343                 return -ENODEV;
2344
2345         /* Step 1: remove reference to ipv6 device from parent device.
2346                    Do not dev_put!
2347          */
2348         if (how == 1) {
2349                 write_lock_bh(&addrconf_lock);
2350                 dev->ip6_ptr = NULL;
2351                 idev->dead = 1;
2352                 write_unlock_bh(&addrconf_lock);
2353
2354                 /* Step 1.5: remove snmp6 entry */
2355                 snmp6_unregister_dev(idev);
2356
2357         }
2358
2359         /* Step 2: clear hash table */
2360         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2361                 bifa = &inet6_addr_lst[i];
2362
2363                 write_lock_bh(&addrconf_hash_lock);
2364                 while ((ifa = *bifa) != NULL) {
2365                         if (ifa->idev == idev) {
2366                                 *bifa = ifa->lst_next;
2367                                 ifa->lst_next = NULL;
2368                                 addrconf_del_timer(ifa);
2369                                 in6_ifa_put(ifa);
2370                                 continue;
2371                         }
2372                         bifa = &ifa->lst_next;
2373                 }
2374                 write_unlock_bh(&addrconf_hash_lock);
2375         }
2376
2377         write_lock_bh(&idev->lock);
2378
2379         /* Step 3: clear flags for stateless addrconf */
2380         if (how != 1)
2381                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2382
2383         /* Step 4: clear address list */
2384 #ifdef CONFIG_IPV6_PRIVACY
2385         if (how == 1 && del_timer(&idev->regen_timer))
2386                 in6_dev_put(idev);
2387
2388         /* clear tempaddr list */
2389         while ((ifa = idev->tempaddr_list) != NULL) {
2390                 idev->tempaddr_list = ifa->tmp_next;
2391                 ifa->tmp_next = NULL;
2392                 ifa->dead = 1;
2393                 write_unlock_bh(&idev->lock);
2394                 spin_lock_bh(&ifa->lock);
2395
2396                 if (ifa->ifpub) {
2397                         in6_ifa_put(ifa->ifpub);
2398                         ifa->ifpub = NULL;
2399                 }
2400                 spin_unlock_bh(&ifa->lock);
2401                 in6_ifa_put(ifa);
2402                 write_lock_bh(&idev->lock);
2403         }
2404 #endif
2405         while ((ifa = idev->addr_list) != NULL) {
2406                 idev->addr_list = ifa->if_next;
2407                 ifa->if_next = NULL;
2408                 ifa->dead = 1;
2409                 addrconf_del_timer(ifa);
2410                 write_unlock_bh(&idev->lock);
2411
2412                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2413                 in6_ifa_put(ifa);
2414
2415                 write_lock_bh(&idev->lock);
2416         }
2417         write_unlock_bh(&idev->lock);
2418
2419         /* Step 5: Discard multicast list */
2420
2421         if (how == 1)
2422                 ipv6_mc_destroy_dev(idev);
2423         else
2424                 ipv6_mc_down(idev);
2425
2426         /* Step 5: netlink notification of this interface */
2427         idev->tstamp = jiffies;
2428         inet6_ifinfo_notify(RTM_DELLINK, idev);
2429
2430         /* Shot the device (if unregistered) */
2431
2432         if (how == 1) {
2433 #ifdef CONFIG_SYSCTL
2434                 addrconf_sysctl_unregister(&idev->cnf);
2435                 neigh_sysctl_unregister(idev->nd_parms);
2436 #endif
2437                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2438                 neigh_ifdown(&nd_tbl, dev);
2439                 in6_dev_put(idev);
2440         }
2441         return 0;
2442 }
2443
2444 static void addrconf_rs_timer(unsigned long data)
2445 {
2446         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2447
2448         if (ifp->idev->cnf.forwarding)
2449                 goto out;
2450
2451         if (ifp->idev->if_flags & IF_RA_RCVD) {
2452                 /*
2453                  *      Announcement received after solicitation
2454                  *      was sent
2455                  */
2456                 goto out;
2457         }
2458
2459         spin_lock(&ifp->lock);
2460         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2461                 struct in6_addr all_routers;
2462
2463                 /* The wait after the last probe can be shorter */
2464                 addrconf_mod_timer(ifp, AC_RS,
2465                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2466                                    ifp->idev->cnf.rtr_solicit_delay :
2467                                    ifp->idev->cnf.rtr_solicit_interval);
2468                 spin_unlock(&ifp->lock);
2469
2470                 ipv6_addr_all_routers(&all_routers);
2471
2472                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2473         } else {
2474                 spin_unlock(&ifp->lock);
2475                 /*
2476                  * Note: we do not support deprecated "all on-link"
2477                  * assumption any longer.
2478                  */
2479                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2480                        ifp->idev->dev->name);
2481         }
2482
2483 out:
2484         in6_ifa_put(ifp);
2485 }
2486
2487 /*
2488  *      Duplicate Address Detection
2489  */
2490 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2491 {
2492         unsigned long rand_num;
2493         struct inet6_dev *idev = ifp->idev;
2494
2495         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2496         ifp->probes = idev->cnf.dad_transmits;
2497         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2498 }
2499
2500 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2501 {
2502         struct inet6_dev *idev = ifp->idev;
2503         struct net_device *dev = idev->dev;
2504
2505         addrconf_join_solict(dev, &ifp->addr);
2506
2507         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2508                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2509                                         flags);
2510
2511         net_srandom(ifp->addr.s6_addr32[3]);
2512
2513         read_lock_bh(&idev->lock);
2514         if (ifp->dead)
2515                 goto out;
2516         spin_lock_bh(&ifp->lock);
2517
2518         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2519             !(ifp->flags&IFA_F_TENTATIVE)) {
2520                 ifp->flags &= ~IFA_F_TENTATIVE;
2521                 spin_unlock_bh(&ifp->lock);
2522                 read_unlock_bh(&idev->lock);
2523
2524                 addrconf_dad_completed(ifp);
2525                 return;
2526         }
2527
2528         if (!(idev->if_flags & IF_READY)) {
2529                 spin_unlock_bh(&ifp->lock);
2530                 read_unlock_bh(&idev->lock);
2531                 /*
2532                  * If the defice is not ready:
2533                  * - keep it tentative if it is a permanent address.
2534                  * - otherwise, kill it.
2535                  */
2536                 in6_ifa_hold(ifp);
2537                 addrconf_dad_stop(ifp);
2538                 return;
2539         }
2540         addrconf_dad_kick(ifp);
2541         spin_unlock_bh(&ifp->lock);
2542 out:
2543         read_unlock_bh(&idev->lock);
2544 }
2545
2546 static void addrconf_dad_timer(unsigned long data)
2547 {
2548         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2549         struct inet6_dev *idev = ifp->idev;
2550         struct in6_addr unspec;
2551         struct in6_addr mcaddr;
2552
2553         read_lock_bh(&idev->lock);
2554         if (idev->dead) {
2555                 read_unlock_bh(&idev->lock);
2556                 goto out;
2557         }
2558         spin_lock_bh(&ifp->lock);
2559         if (ifp->probes == 0) {
2560                 /*
2561                  * DAD was successful
2562                  */
2563
2564                 ifp->flags &= ~IFA_F_TENTATIVE;
2565                 spin_unlock_bh(&ifp->lock);
2566                 read_unlock_bh(&idev->lock);
2567
2568                 addrconf_dad_completed(ifp);
2569
2570                 goto out;
2571         }
2572
2573         ifp->probes--;
2574         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2575         spin_unlock_bh(&ifp->lock);
2576         read_unlock_bh(&idev->lock);
2577
2578         /* send a neighbour solicitation for our addr */
2579         memset(&unspec, 0, sizeof(unspec));
2580         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2581         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2582 out:
2583         in6_ifa_put(ifp);
2584 }
2585
2586 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2587 {
2588         struct net_device *     dev = ifp->idev->dev;
2589
2590         /*
2591          *      Configure the address for reception. Now it is valid.
2592          */
2593
2594         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2595
2596         /* If added prefix is link local and forwarding is off,
2597            start sending router solicitations.
2598          */
2599
2600         if (ifp->idev->cnf.forwarding == 0 &&
2601             ifp->idev->cnf.rtr_solicits > 0 &&
2602             (dev->flags&IFF_LOOPBACK) == 0 &&
2603             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2604                 struct in6_addr all_routers;
2605
2606                 ipv6_addr_all_routers(&all_routers);
2607
2608                 /*
2609                  *      If a host as already performed a random delay
2610                  *      [...] as part of DAD [...] there is no need
2611                  *      to delay again before sending the first RS
2612                  */
2613                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2614
2615                 spin_lock_bh(&ifp->lock);
2616                 ifp->probes = 1;
2617                 ifp->idev->if_flags |= IF_RS_SENT;
2618                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2619                 spin_unlock_bh(&ifp->lock);
2620         }
2621 }
2622
2623 static void addrconf_dad_run(struct inet6_dev *idev) {
2624         struct inet6_ifaddr *ifp;
2625
2626         read_lock_bh(&idev->lock);
2627         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2628                 spin_lock_bh(&ifp->lock);
2629                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2630                         spin_unlock_bh(&ifp->lock);
2631                         continue;
2632                 }
2633                 spin_unlock_bh(&ifp->lock);
2634                 addrconf_dad_kick(ifp);
2635         }
2636         read_unlock_bh(&idev->lock);
2637 }
2638
2639 #ifdef CONFIG_PROC_FS
2640 struct if6_iter_state {
2641         int bucket;
2642 };
2643
2644 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2645 {
2646         struct inet6_ifaddr *ifa = NULL;
2647         struct if6_iter_state *state = seq->private;
2648
2649         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2650                 ifa = inet6_addr_lst[state->bucket];
2651                 if (ifa)
2652                         break;
2653         }
2654         return ifa;
2655 }
2656
2657 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2658 {
2659         struct if6_iter_state *state = seq->private;
2660
2661         ifa = ifa->lst_next;
2662 try_again:
2663         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2664                 ifa = inet6_addr_lst[state->bucket];
2665                 goto try_again;
2666         }
2667         return ifa;
2668 }
2669
2670 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2671 {
2672         struct inet6_ifaddr *ifa = if6_get_first(seq);
2673
2674         if (ifa)
2675                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2676                         --pos;
2677         return pos ? NULL : ifa;
2678 }
2679
2680 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2681 {
2682         read_lock_bh(&addrconf_hash_lock);
2683         return if6_get_idx(seq, *pos);
2684 }
2685
2686 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2687 {
2688         struct inet6_ifaddr *ifa;
2689
2690         ifa = if6_get_next(seq, v);
2691         ++*pos;
2692         return ifa;
2693 }
2694
2695 static void if6_seq_stop(struct seq_file *seq, void *v)
2696 {
2697         read_unlock_bh(&addrconf_hash_lock);
2698 }
2699
2700 static int if6_seq_show(struct seq_file *seq, void *v)
2701 {
2702         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2703         seq_printf(seq,
2704                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2705                    NIP6(ifp->addr),
2706                    ifp->idev->dev->ifindex,
2707                    ifp->prefix_len,
2708                    ifp->scope,
2709                    ifp->flags,
2710                    ifp->idev->dev->name);
2711         return 0;
2712 }
2713
2714 static struct seq_operations if6_seq_ops = {
2715         .start  = if6_seq_start,
2716         .next   = if6_seq_next,
2717         .show   = if6_seq_show,
2718         .stop   = if6_seq_stop,
2719 };
2720
2721 static int if6_seq_open(struct inode *inode, struct file *file)
2722 {
2723         struct seq_file *seq;
2724         int rc = -ENOMEM;
2725         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2726
2727         if (!s)
2728                 goto out;
2729
2730         rc = seq_open(file, &if6_seq_ops);
2731         if (rc)
2732                 goto out_kfree;
2733
2734         seq = file->private_data;
2735         seq->private = s;
2736 out:
2737         return rc;
2738 out_kfree:
2739         kfree(s);
2740         goto out;
2741 }
2742
2743 static struct file_operations if6_fops = {
2744         .owner          = THIS_MODULE,
2745         .open           = if6_seq_open,
2746         .read           = seq_read,
2747         .llseek         = seq_lseek,
2748         .release        = seq_release_private,
2749 };
2750
2751 int __init if6_proc_init(void)
2752 {
2753         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2754                 return -ENOMEM;
2755         return 0;
2756 }
2757
2758 void if6_proc_exit(void)
2759 {
2760         proc_net_remove("if_inet6");
2761 }
2762 #endif  /* CONFIG_PROC_FS */
2763
2764 /*
2765  *      Periodic address status verification
2766  */
2767
2768 static void addrconf_verify(unsigned long foo)
2769 {
2770         struct inet6_ifaddr *ifp;
2771         unsigned long now, next;
2772         int i;
2773
2774         spin_lock_bh(&addrconf_verify_lock);
2775         now = jiffies;
2776         next = now + ADDR_CHECK_FREQUENCY;
2777
2778         del_timer(&addr_chk_timer);
2779
2780         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2781
2782 restart:
2783                 read_lock(&addrconf_hash_lock);
2784                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2785                         unsigned long age;
2786 #ifdef CONFIG_IPV6_PRIVACY
2787                         unsigned long regen_advance;
2788 #endif
2789
2790                         if (ifp->flags & IFA_F_PERMANENT)
2791                                 continue;
2792
2793                         spin_lock(&ifp->lock);
2794                         age = (now - ifp->tstamp) / HZ;
2795
2796 #ifdef CONFIG_IPV6_PRIVACY
2797                         regen_advance = ifp->idev->cnf.regen_max_retry *
2798                                         ifp->idev->cnf.dad_transmits *
2799                                         ifp->idev->nd_parms->retrans_time / HZ;
2800 #endif
2801
2802                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2803                             age >= ifp->valid_lft) {
2804                                 spin_unlock(&ifp->lock);
2805                                 in6_ifa_hold(ifp);
2806                                 read_unlock(&addrconf_hash_lock);
2807                                 ipv6_del_addr(ifp);
2808                                 goto restart;
2809                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2810                                 spin_unlock(&ifp->lock);
2811                                 continue;
2812                         } else if (age >= ifp->prefered_lft) {
2813                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2814                                 int deprecate = 0;
2815
2816                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2817                                         deprecate = 1;
2818                                         ifp->flags |= IFA_F_DEPRECATED;
2819                                 }
2820
2821                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2822                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2823
2824                                 spin_unlock(&ifp->lock);
2825
2826                                 if (deprecate) {
2827                                         in6_ifa_hold(ifp);
2828                                         read_unlock(&addrconf_hash_lock);
2829
2830                                         ipv6_ifa_notify(0, ifp);
2831                                         in6_ifa_put(ifp);
2832                                         goto restart;
2833                                 }
2834 #ifdef CONFIG_IPV6_PRIVACY
2835                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2836                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2837                                 if (age >= ifp->prefered_lft - regen_advance) {
2838                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2839                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2840                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2841                                         if (!ifp->regen_count && ifpub) {
2842                                                 ifp->regen_count++;
2843                                                 in6_ifa_hold(ifp);
2844                                                 in6_ifa_hold(ifpub);
2845                                                 spin_unlock(&ifp->lock);
2846                                                 read_unlock(&addrconf_hash_lock);
2847                                                 spin_lock(&ifpub->lock);
2848                                                 ifpub->regen_count = 0;
2849                                                 spin_unlock(&ifpub->lock);
2850                                                 ipv6_create_tempaddr(ifpub, ifp);
2851                                                 in6_ifa_put(ifpub);
2852                                                 in6_ifa_put(ifp);
2853                                                 goto restart;
2854                                         }
2855                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2856                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2857                                 spin_unlock(&ifp->lock);
2858 #endif
2859                         } else {
2860                                 /* ifp->prefered_lft <= ifp->valid_lft */
2861                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2862                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2863                                 spin_unlock(&ifp->lock);
2864                         }
2865                 }
2866                 read_unlock(&addrconf_hash_lock);
2867         }
2868
2869         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2870         add_timer(&addr_chk_timer);
2871         spin_unlock_bh(&addrconf_verify_lock);
2872 }
2873
2874 static int
2875 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2876 {
2877         struct rtattr **rta = arg;
2878         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2879         struct in6_addr *pfx;
2880
2881         pfx = NULL;
2882         if (rta[IFA_ADDRESS-1]) {
2883                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2884                         return -EINVAL;
2885                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2886         }
2887         if (rta[IFA_LOCAL-1]) {
2888                 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
2889                     (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
2890                         return -EINVAL;
2891                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2892         }
2893         if (pfx == NULL)
2894                 return -EINVAL;
2895
2896         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2897 }
2898
2899 static int
2900 inet6_addr_modify(int ifindex, struct in6_addr *pfx,
2901                   __u32 prefered_lft, __u32 valid_lft)
2902 {
2903         struct inet6_ifaddr *ifp = NULL;
2904         struct net_device *dev;
2905         int ifa_flags = 0;
2906
2907         if ((dev = __dev_get_by_index(ifindex)) == NULL)
2908                 return -ENODEV;
2909
2910         if (!(dev->flags&IFF_UP))
2911                 return -ENETDOWN;
2912
2913         if (!valid_lft || (prefered_lft > valid_lft))
2914                 return -EINVAL;
2915
2916         ifp = ipv6_get_ifaddr(pfx, dev, 1);
2917         if (ifp == NULL)
2918                 return -ENOENT;
2919
2920         if (valid_lft == INFINITY_LIFE_TIME)
2921                 ifa_flags = IFA_F_PERMANENT;
2922         else if (valid_lft >= 0x7FFFFFFF/HZ)
2923                 valid_lft = 0x7FFFFFFF/HZ;
2924
2925         if (prefered_lft == 0)
2926                 ifa_flags = IFA_F_DEPRECATED;
2927         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2928                  (prefered_lft != INFINITY_LIFE_TIME))
2929                 prefered_lft = 0x7FFFFFFF/HZ;
2930
2931         spin_lock_bh(&ifp->lock);
2932         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED|IFA_F_PERMANENT)) | ifa_flags;
2933
2934         ifp->tstamp = jiffies;
2935         ifp->valid_lft = valid_lft;
2936         ifp->prefered_lft = prefered_lft;
2937
2938         spin_unlock_bh(&ifp->lock);
2939         if (!(ifp->flags&IFA_F_TENTATIVE))
2940                 ipv6_ifa_notify(0, ifp);
2941         in6_ifa_put(ifp);
2942
2943         addrconf_verify(0);
2944
2945         return 0;
2946 }
2947
2948 static int
2949 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2950 {
2951         struct rtattr  **rta = arg;
2952         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2953         struct in6_addr *pfx;
2954         __u32 valid_lft = INFINITY_LIFE_TIME, prefered_lft = INFINITY_LIFE_TIME;
2955
2956         pfx = NULL;
2957         if (rta[IFA_ADDRESS-1]) {
2958                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2959                         return -EINVAL;
2960                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2961         }
2962         if (rta[IFA_LOCAL-1]) {
2963                 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
2964                     (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
2965                         return -EINVAL;
2966                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2967         }
2968         if (pfx == NULL)
2969                 return -EINVAL;
2970
2971         if (rta[IFA_CACHEINFO-1]) {
2972                 struct ifa_cacheinfo *ci;
2973                 if (RTA_PAYLOAD(rta[IFA_CACHEINFO-1]) < sizeof(*ci))
2974                         return -EINVAL;
2975                 ci = RTA_DATA(rta[IFA_CACHEINFO-1]);
2976                 valid_lft = ci->ifa_valid;
2977                 prefered_lft = ci->ifa_prefered;
2978         }
2979
2980         if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2981                 int ret;
2982                 ret = inet6_addr_modify(ifm->ifa_index, pfx,
2983                                         prefered_lft, valid_lft);
2984                 if (ret == 0 || !(nlh->nlmsg_flags & NLM_F_CREATE))
2985                         return ret;
2986         }
2987
2988         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
2989                               prefered_lft, valid_lft);
2990
2991 }
2992
2993 /* Maximum length of ifa_cacheinfo attributes */
2994 #define INET6_IFADDR_RTA_SPACE \
2995                 RTA_SPACE(16) /* IFA_ADDRESS */ + \
2996                 RTA_SPACE(sizeof(struct ifa_cacheinfo)) /* CACHEINFO */
2997
2998 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2999                              u32 pid, u32 seq, int event, unsigned int flags)
3000 {
3001         struct ifaddrmsg *ifm;
3002         struct nlmsghdr  *nlh;
3003         struct ifa_cacheinfo ci;
3004         unsigned char    *b = skb->tail;
3005
3006         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3007         ifm = NLMSG_DATA(nlh);
3008         ifm->ifa_family = AF_INET6;
3009         ifm->ifa_prefixlen = ifa->prefix_len;
3010         ifm->ifa_flags = ifa->flags;
3011         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3012         if (ifa->scope&IFA_HOST)
3013                 ifm->ifa_scope = RT_SCOPE_HOST;
3014         else if (ifa->scope&IFA_LINK)
3015                 ifm->ifa_scope = RT_SCOPE_LINK;
3016         else if (ifa->scope&IFA_SITE)
3017                 ifm->ifa_scope = RT_SCOPE_SITE;
3018         ifm->ifa_index = ifa->idev->dev->ifindex;
3019         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
3020         if (!(ifa->flags&IFA_F_PERMANENT)) {
3021                 ci.ifa_prefered = ifa->prefered_lft;
3022                 ci.ifa_valid = ifa->valid_lft;
3023                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
3024                         long tval = (jiffies - ifa->tstamp)/HZ;
3025                         ci.ifa_prefered -= tval;
3026                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
3027                                 ci.ifa_valid -= tval;
3028                 }
3029         } else {
3030                 ci.ifa_prefered = INFINITY_LIFE_TIME;
3031                 ci.ifa_valid = INFINITY_LIFE_TIME;
3032         }
3033         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
3034                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3035         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
3036                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3037         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3038         nlh->nlmsg_len = skb->tail - b;
3039         return skb->len;
3040
3041 nlmsg_failure:
3042 rtattr_failure:
3043         skb_trim(skb, b - skb->data);
3044         return -1;
3045 }
3046
3047 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3048                                 u32 pid, u32 seq, int event, u16 flags)
3049 {
3050         struct ifaddrmsg *ifm;
3051         struct nlmsghdr  *nlh;
3052         struct ifa_cacheinfo ci;
3053         unsigned char    *b = skb->tail;
3054
3055         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3056         ifm = NLMSG_DATA(nlh);
3057         ifm->ifa_family = AF_INET6;
3058         ifm->ifa_prefixlen = 128;
3059         ifm->ifa_flags = IFA_F_PERMANENT;
3060         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3061         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
3062                 ifm->ifa_scope = RT_SCOPE_SITE;
3063         ifm->ifa_index = ifmca->idev->dev->ifindex;
3064         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
3065         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
3066                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
3067                     * 100 / HZ);
3068         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
3069                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
3070                     * 100 / HZ);
3071         ci.ifa_prefered = INFINITY_LIFE_TIME;
3072         ci.ifa_valid = INFINITY_LIFE_TIME;
3073         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3074         nlh->nlmsg_len = skb->tail - b;
3075         return skb->len;
3076
3077 nlmsg_failure:
3078 rtattr_failure:
3079         skb_trim(skb, b - skb->data);
3080         return -1;
3081 }
3082
3083 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3084                                 u32 pid, u32 seq, int event, unsigned int flags)
3085 {
3086         struct ifaddrmsg *ifm;
3087         struct nlmsghdr  *nlh;
3088         struct ifa_cacheinfo ci;
3089         unsigned char    *b = skb->tail;
3090
3091         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3092         ifm = NLMSG_DATA(nlh);
3093         ifm->ifa_family = AF_INET6;
3094         ifm->ifa_prefixlen = 128;
3095         ifm->ifa_flags = IFA_F_PERMANENT;
3096         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3097         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
3098                 ifm->ifa_scope = RT_SCOPE_SITE;
3099         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
3100         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
3101         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
3102                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
3103                     * 100 / HZ);
3104         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
3105                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
3106                     * 100 / HZ);
3107         ci.ifa_prefered = INFINITY_LIFE_TIME;
3108         ci.ifa_valid = INFINITY_LIFE_TIME;
3109         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3110         nlh->nlmsg_len = skb->tail - b;
3111         return skb->len;
3112
3113 nlmsg_failure:
3114 rtattr_failure:
3115         skb_trim(skb, b - skb->data);
3116         return -1;
3117 }
3118
3119 enum addr_type_t
3120 {
3121         UNICAST_ADDR,
3122         MULTICAST_ADDR,
3123         ANYCAST_ADDR,
3124 };
3125
3126 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3127                            enum addr_type_t type)
3128 {
3129         int idx, ip_idx;
3130         int s_idx, s_ip_idx;
3131         int err = 1;
3132         struct net_device *dev;
3133         struct inet6_dev *idev = NULL;
3134         struct inet6_ifaddr *ifa;
3135         struct ifmcaddr6 *ifmca;
3136         struct ifacaddr6 *ifaca;
3137
3138         s_idx = cb->args[0];
3139         s_ip_idx = ip_idx = cb->args[1];
3140         read_lock(&dev_base_lock);
3141
3142         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3143                 if (idx < s_idx)
3144                         continue;
3145                 if (idx > s_idx)
3146                         s_ip_idx = 0;
3147                 ip_idx = 0;
3148                 if ((idev = in6_dev_get(dev)) == NULL)
3149                         continue;
3150                 read_lock_bh(&idev->lock);
3151                 switch (type) {
3152                 case UNICAST_ADDR:
3153                         /* unicast address incl. temp addr */
3154                         for (ifa = idev->addr_list; ifa;
3155                              ifa = ifa->if_next, ip_idx++) {
3156                                 if (ip_idx < s_ip_idx)
3157                                         continue;
3158                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3159                                     NETLINK_CB(cb->skb).pid,
3160                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3161                                     NLM_F_MULTI)) <= 0)
3162                                         goto done;
3163                         }
3164                         break;
3165                 case MULTICAST_ADDR:
3166                         /* multicast address */
3167                         for (ifmca = idev->mc_list; ifmca;
3168                              ifmca = ifmca->next, ip_idx++) {
3169                                 if (ip_idx < s_ip_idx)
3170                                         continue;
3171                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3172                                     NETLINK_CB(cb->skb).pid,
3173                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3174                                     NLM_F_MULTI)) <= 0)
3175                                         goto done;
3176                         }
3177                         break;
3178                 case ANYCAST_ADDR:
3179                         /* anycast address */
3180                         for (ifaca = idev->ac_list; ifaca;
3181                              ifaca = ifaca->aca_next, ip_idx++) {
3182                                 if (ip_idx < s_ip_idx)
3183                                         continue;
3184                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3185                                     NETLINK_CB(cb->skb).pid,
3186                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3187                                     NLM_F_MULTI)) <= 0)
3188                                         goto done;
3189                         }
3190                         break;
3191                 default:
3192                         break;
3193                 }
3194                 read_unlock_bh(&idev->lock);
3195                 in6_dev_put(idev);
3196         }
3197 done:
3198         if (err <= 0) {
3199                 read_unlock_bh(&idev->lock);
3200                 in6_dev_put(idev);
3201         }
3202         read_unlock(&dev_base_lock);
3203         cb->args[0] = idx;
3204         cb->args[1] = ip_idx;
3205         return skb->len;
3206 }
3207
3208 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3209 {
3210         enum addr_type_t type = UNICAST_ADDR;
3211         return inet6_dump_addr(skb, cb, type);
3212 }
3213
3214 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3215 {
3216         enum addr_type_t type = MULTICAST_ADDR;
3217         return inet6_dump_addr(skb, cb, type);
3218 }
3219
3220
3221 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3222 {
3223         enum addr_type_t type = ANYCAST_ADDR;
3224         return inet6_dump_addr(skb, cb, type);
3225 }
3226
3227 static int inet6_rtm_getaddr(struct sk_buff *in_skb,
3228                 struct nlmsghdr* nlh, void *arg)
3229 {
3230         struct rtattr **rta = arg;
3231         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
3232         struct in6_addr *addr = NULL;
3233         struct net_device *dev = NULL;
3234         struct inet6_ifaddr *ifa;
3235         struct sk_buff *skb;
3236         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE);
3237         int err;
3238
3239         if (rta[IFA_ADDRESS-1]) {
3240                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*addr))
3241                         return -EINVAL;
3242                 addr = RTA_DATA(rta[IFA_ADDRESS-1]);
3243         }
3244         if (rta[IFA_LOCAL-1]) {
3245                 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*addr) ||
3246                     (addr && memcmp(addr, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*addr))))
3247                         return -EINVAL;
3248                 addr = RTA_DATA(rta[IFA_LOCAL-1]);
3249         }
3250         if (addr == NULL)
3251                 return -EINVAL;
3252
3253         if (ifm->ifa_index)
3254                 dev = __dev_get_by_index(ifm->ifa_index);
3255
3256         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL)
3257                 return -EADDRNOTAVAIL;
3258
3259         if ((skb = alloc_skb(size, GFP_KERNEL)) == NULL) {
3260                 err = -ENOBUFS;
3261                 goto out;
3262         }
3263
3264         NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
3265         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3266                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3267         if (err < 0) {
3268                 err = -EMSGSIZE;
3269                 goto out_free;
3270         }
3271
3272         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3273 out:
3274         in6_ifa_put(ifa);
3275         return err;
3276 out_free:
3277         kfree_skb(skb);
3278         goto out;
3279 }
3280
3281 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3282 {
3283         struct sk_buff *skb;
3284         int payload = sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE;
3285         int err = -ENOBUFS;
3286
3287         skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC);
3288         if (skb == NULL)
3289                 goto errout;
3290
3291         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3292         if (err < 0) {
3293                 kfree_skb(skb);
3294                 goto errout;
3295         }
3296
3297         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3298 errout:
3299         if (err < 0)
3300                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3301 }
3302
3303 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3304                                 __s32 *array, int bytes)
3305 {
3306         memset(array, 0, bytes);
3307         array[DEVCONF_FORWARDING] = cnf->forwarding;
3308         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3309         array[DEVCONF_MTU6] = cnf->mtu6;
3310         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3311         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3312         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3313         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3314         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3315         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3316         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3317         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3318 #ifdef CONFIG_IPV6_PRIVACY
3319         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3320         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3321         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3322         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3323         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3324 #endif
3325         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3326         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3327         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3328 #ifdef CONFIG_IPV6_ROUTER_PREF
3329         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3330         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3331 #ifdef CONFIV_IPV6_ROUTE_INFO
3332         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3333 #endif
3334 #endif
3335 }
3336
3337 /* Maximum length of ifinfomsg attributes */
3338 #define INET6_IFINFO_RTA_SPACE \
3339                 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \
3340                 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \
3341                 RTA_SPACE(sizeof(u32)) /* MTU */ + \
3342                 RTA_SPACE(sizeof(int)) /* LINK */ + \
3343                 RTA_SPACE(0) /* PROTINFO */ + \
3344                 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \
3345                 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \
3346                 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */
3347
3348 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3349                              u32 pid, u32 seq, int event, unsigned int flags)
3350 {
3351         struct net_device       *dev = idev->dev;
3352         __s32                   *array = NULL;
3353         struct ifinfomsg        *r;
3354         struct nlmsghdr         *nlh;
3355         unsigned char           *b = skb->tail;
3356         struct rtattr           *subattr;
3357         __u32                   mtu = dev->mtu;
3358         struct ifla_cacheinfo   ci;
3359
3360         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3361         r = NLMSG_DATA(nlh);
3362         r->ifi_family = AF_INET6;
3363         r->__ifi_pad = 0;
3364         r->ifi_type = dev->type;
3365         r->ifi_index = dev->ifindex;
3366         r->ifi_flags = dev_get_flags(dev);
3367         r->ifi_change = 0;
3368
3369         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3370
3371         if (dev->addr_len)
3372                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3373
3374         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3375         if (dev->ifindex != dev->iflink)
3376                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3377
3378         subattr = (struct rtattr*)skb->tail;
3379
3380         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3381
3382         /* return the device flags */
3383         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3384
3385         /* return interface cacheinfo */
3386         ci.max_reasm_len = IPV6_MAXPLEN;
3387         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3388                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3389         ci.reachable_time = idev->nd_parms->reachable_time;
3390         ci.retrans_time = idev->nd_parms->retrans_time;
3391         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3392
3393         /* return the device sysctl params */
3394         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3395                 goto rtattr_failure;
3396         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3397         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3398
3399         /* XXX - Statistics/MC not implemented */
3400         subattr->rta_len = skb->tail - (u8*)subattr;
3401
3402         nlh->nlmsg_len = skb->tail - b;
3403         kfree(array);
3404         return skb->len;
3405
3406 nlmsg_failure:
3407 rtattr_failure:
3408         kfree(array);
3409         skb_trim(skb, b - skb->data);
3410         return -1;
3411 }
3412
3413 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3414 {
3415         int idx, err;
3416         int s_idx = cb->args[0];
3417         struct net_device *dev;
3418         struct inet6_dev *idev;
3419
3420         read_lock(&dev_base_lock);
3421         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3422                 if (idx < s_idx)
3423                         continue;
3424                 if ((idev = in6_dev_get(dev)) == NULL)
3425                         continue;
3426                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3427                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3428                 in6_dev_put(idev);
3429                 if (err <= 0)
3430                         break;
3431         }
3432         read_unlock(&dev_base_lock);
3433         cb->args[0] = idx;
3434
3435         return skb->len;
3436 }
3437
3438 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3439 {
3440         struct sk_buff *skb;
3441         int payload = sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE;
3442         int err = -ENOBUFS;
3443
3444         skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC);
3445         if (skb == NULL)
3446                 goto errout;
3447
3448         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3449         if (err < 0) {
3450                 kfree_skb(skb);
3451                 goto errout;
3452         }
3453
3454         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3455 errout:
3456         if (err < 0)
3457                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3458 }
3459
3460 /* Maximum length of prefix_cacheinfo attributes */
3461 #define INET6_PREFIX_RTA_SPACE \
3462                 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \
3463                 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */
3464
3465 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3466                         struct prefix_info *pinfo, u32 pid, u32 seq,
3467                         int event, unsigned int flags)
3468 {
3469         struct prefixmsg        *pmsg;
3470         struct nlmsghdr         *nlh;
3471         unsigned char           *b = skb->tail;
3472         struct prefix_cacheinfo ci;
3473
3474         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3475         pmsg = NLMSG_DATA(nlh);
3476         pmsg->prefix_family = AF_INET6;
3477         pmsg->prefix_pad1 = 0;
3478         pmsg->prefix_pad2 = 0;
3479         pmsg->prefix_ifindex = idev->dev->ifindex;
3480         pmsg->prefix_len = pinfo->prefix_len;
3481         pmsg->prefix_type = pinfo->type;
3482         pmsg->prefix_pad3 = 0;
3483
3484         pmsg->prefix_flags = 0;
3485         if (pinfo->onlink)
3486                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3487         if (pinfo->autoconf)
3488                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3489
3490         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3491
3492         ci.preferred_time = ntohl(pinfo->prefered);
3493         ci.valid_time = ntohl(pinfo->valid);
3494         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3495
3496         nlh->nlmsg_len = skb->tail - b;
3497         return skb->len;
3498
3499 nlmsg_failure:
3500 rtattr_failure:
3501         skb_trim(skb, b - skb->data);
3502         return -1;
3503 }
3504
3505 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3506                          struct prefix_info *pinfo)
3507 {
3508         struct sk_buff *skb;
3509         int payload = sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE;
3510         int err = -ENOBUFS;
3511
3512         skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC);
3513         if (skb == NULL)
3514                 goto errout;
3515
3516         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3517         if (err < 0) {
3518                 kfree_skb(skb);
3519                 goto errout;
3520         }
3521
3522         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3523 errout:
3524         if (err < 0)
3525                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3526 }
3527
3528 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3529         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3530         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3531         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3532         [RTM_GETADDR - RTM_BASE] = { .doit      = inet6_rtm_getaddr,
3533                                      .dumpit    = inet6_dump_ifaddr, },
3534         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3535         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3536         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3537         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3538         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3539                                       .dumpit   = inet6_dump_fib, },
3540 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3541         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = fib6_rules_dump,   },
3542 #endif
3543 };
3544
3545 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3546 {
3547         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3548
3549         switch (event) {
3550         case RTM_NEWADDR:
3551                 ip6_ins_rt(ifp->rt);
3552                 if (ifp->idev->cnf.forwarding)
3553                         addrconf_join_anycast(ifp);
3554                 break;
3555         case RTM_DELADDR:
3556                 if (ifp->idev->cnf.forwarding)
3557                         addrconf_leave_anycast(ifp);
3558                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3559                 dst_hold(&ifp->rt->u.dst);
3560                 if (ip6_del_rt(ifp->rt))
3561                         dst_free(&ifp->rt->u.dst);
3562                 break;
3563         }
3564 }
3565
3566 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3567 {
3568         read_lock_bh(&addrconf_lock);
3569         if (likely(ifp->idev->dead == 0))
3570                 __ipv6_ifa_notify(event, ifp);
3571         read_unlock_bh(&addrconf_lock);
3572 }
3573
3574 #ifdef CONFIG_SYSCTL
3575
3576 static
3577 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3578                            void __user *buffer, size_t *lenp, loff_t *ppos)
3579 {
3580         int *valp = ctl->data;
3581         int val = *valp;
3582         int ret;
3583
3584         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3585
3586         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3587                 if (valp != &ipv6_devconf.forwarding) {
3588                         if ((!*valp) ^ (!val)) {
3589                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3590                                 if (idev == NULL)
3591                                         return ret;
3592                                 dev_forward_change(idev);
3593                         }
3594                 } else {
3595                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3596                         addrconf_forward_change();
3597                 }
3598                 if (*valp)
3599                         rt6_purge_dflt_routers();
3600         }
3601
3602         return ret;
3603 }
3604
3605 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3606                                             int __user *name, int nlen,
3607                                             void __user *oldval,
3608                                             size_t __user *oldlenp,
3609                                             void __user *newval, size_t newlen,
3610                                             void **context)
3611 {
3612         int *valp = table->data;
3613         int new;
3614
3615         if (!newval || !newlen)
3616                 return 0;
3617         if (newlen != sizeof(int))
3618                 return -EINVAL;
3619         if (get_user(new, (int __user *)newval))
3620                 return -EFAULT;
3621         if (new == *valp)
3622                 return 0;
3623         if (oldval && oldlenp) {
3624                 size_t len;
3625                 if (get_user(len, oldlenp))
3626                         return -EFAULT;
3627                 if (len) {
3628                         if (len > table->maxlen)
3629                                 len = table->maxlen;
3630                         if (copy_to_user(oldval, valp, len))
3631                                 return -EFAULT;
3632                         if (put_user(len, oldlenp))
3633                                 return -EFAULT;
3634                 }
3635         }
3636
3637         if (valp != &ipv6_devconf_dflt.forwarding) {
3638                 if (valp != &ipv6_devconf.forwarding) {
3639                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3640                         int changed;
3641                         if (unlikely(idev == NULL))
3642                                 return -ENODEV;
3643                         changed = (!*valp) ^ (!new);
3644                         *valp = new;
3645                         if (changed)
3646                                 dev_forward_change(idev);
3647                 } else {
3648                         *valp = new;
3649                         addrconf_forward_change();
3650                 }
3651
3652                 if (*valp)
3653                         rt6_purge_dflt_routers();
3654         } else
3655                 *valp = new;
3656
3657         return 1;
3658 }
3659
3660 static struct addrconf_sysctl_table
3661 {
3662         struct ctl_table_header *sysctl_header;
3663         ctl_table addrconf_vars[__NET_IPV6_MAX];
3664         ctl_table addrconf_dev[2];
3665         ctl_table addrconf_conf_dir[2];
3666         ctl_table addrconf_proto_dir[2];
3667         ctl_table addrconf_root_dir[2];
3668 } addrconf_sysctl __read_mostly = {
3669         .sysctl_header = NULL,
3670         .addrconf_vars = {
3671                 {
3672                         .ctl_name       =       NET_IPV6_FORWARDING,
3673                         .procname       =       "forwarding",
3674                         .data           =       &ipv6_devconf.forwarding,
3675                         .maxlen         =       sizeof(int),
3676                         .mode           =       0644,
3677                         .proc_handler   =       &addrconf_sysctl_forward,
3678                         .strategy       =       &addrconf_sysctl_forward_strategy,
3679                 },
3680                 {
3681                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3682                         .procname       =       "hop_limit",
3683                         .data           =       &ipv6_devconf.hop_limit,
3684                         .maxlen         =       sizeof(int),
3685                         .mode           =       0644,
3686                         .proc_handler   =       proc_dointvec,
3687                 },
3688                 {
3689                         .ctl_name       =       NET_IPV6_MTU,
3690                         .procname       =       "mtu",
3691                         .data           =       &ipv6_devconf.mtu6,
3692                         .maxlen         =       sizeof(int),
3693                         .mode           =       0644,
3694                         .proc_handler   =       &proc_dointvec,
3695                 },
3696                 {
3697                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3698                         .procname       =       "accept_ra",
3699                         .data           =       &ipv6_devconf.accept_ra,
3700                         .maxlen         =       sizeof(int),
3701                         .mode           =       0644,
3702                         .proc_handler   =       &proc_dointvec,
3703                 },
3704                 {
3705                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3706                         .procname       =       "accept_redirects",
3707                         .data           =       &ipv6_devconf.accept_redirects,
3708                         .maxlen         =       sizeof(int),
3709                         .mode           =       0644,
3710                         .proc_handler   =       &proc_dointvec,
3711                 },
3712                 {
3713                         .ctl_name       =       NET_IPV6_AUTOCONF,
3714                         .procname       =       "autoconf",
3715                         .data           =       &ipv6_devconf.autoconf,
3716                         .maxlen         =       sizeof(int),
3717                         .mode           =       0644,
3718                         .proc_handler   =       &proc_dointvec,
3719                 },
3720                 {
3721                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3722                         .procname       =       "dad_transmits",
3723                         .data           =       &ipv6_devconf.dad_transmits,
3724                         .maxlen         =       sizeof(int),
3725                         .mode           =       0644,
3726                         .proc_handler   =       &proc_dointvec,
3727                 },
3728                 {
3729                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3730                         .procname       =       "router_solicitations",
3731                         .data           =       &ipv6_devconf.rtr_solicits,
3732                         .maxlen         =       sizeof(int),
3733                         .mode           =       0644,
3734                         .proc_handler   =       &proc_dointvec,
3735                 },
3736                 {
3737                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3738                         .procname       =       "router_solicitation_interval",
3739                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3740                         .maxlen         =       sizeof(int),
3741                         .mode           =       0644,
3742                         .proc_handler   =       &proc_dointvec_jiffies,
3743                         .strategy       =       &sysctl_jiffies,
3744                 },
3745                 {
3746                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3747                         .procname       =       "router_solicitation_delay",
3748                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3749                         .maxlen         =       sizeof(int),
3750                         .mode           =       0644,
3751                         .proc_handler   =       &proc_dointvec_jiffies,
3752                         .strategy       =       &sysctl_jiffies,
3753                 },
3754                 {
3755                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3756                         .procname       =       "force_mld_version",
3757                         .data           =       &ipv6_devconf.force_mld_version,
3758                         .maxlen         =       sizeof(int),
3759                         .mode           =       0644,
3760                         .proc_handler   =       &proc_dointvec,
3761                 },
3762 #ifdef CONFIG_IPV6_PRIVACY
3763                 {
3764                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3765                         .procname       =       "use_tempaddr",
3766                         .data           =       &ipv6_devconf.use_tempaddr,
3767                         .maxlen         =       sizeof(int),
3768                         .mode           =       0644,
3769                         .proc_handler   =       &proc_dointvec,
3770                 },
3771                 {
3772                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3773                         .procname       =       "temp_valid_lft",
3774                         .data           =       &ipv6_devconf.temp_valid_lft,
3775                         .maxlen         =       sizeof(int),
3776                         .mode           =       0644,
3777                         .proc_handler   =       &proc_dointvec,
3778                 },
3779                 {
3780                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3781                         .procname       =       "temp_prefered_lft",
3782                         .data           =       &ipv6_devconf.temp_prefered_lft,
3783                         .maxlen         =       sizeof(int),
3784                         .mode           =       0644,
3785                         .proc_handler   =       &proc_dointvec,
3786                 },
3787                 {
3788                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3789                         .procname       =       "regen_max_retry",
3790                         .data           =       &ipv6_devconf.regen_max_retry,
3791                         .maxlen         =       sizeof(int),
3792                         .mode           =       0644,
3793                         .proc_handler   =       &proc_dointvec,
3794                 },
3795                 {
3796                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3797                         .procname       =       "max_desync_factor",
3798                         .data           =       &ipv6_devconf.max_desync_factor,
3799                         .maxlen         =       sizeof(int),
3800                         .mode           =       0644,
3801                         .proc_handler   =       &proc_dointvec,
3802                 },
3803 #endif
3804                 {
3805                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3806                         .procname       =       "max_addresses",
3807                         .data           =       &ipv6_devconf.max_addresses,
3808                         .maxlen         =       sizeof(int),
3809                         .mode           =       0644,
3810                         .proc_handler   =       &proc_dointvec,
3811                 },
3812                 {
3813                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3814                         .procname       =       "accept_ra_defrtr",
3815                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3816                         .maxlen         =       sizeof(int),
3817                         .mode           =       0644,
3818                         .proc_handler   =       &proc_dointvec,
3819                 },
3820                 {
3821                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3822                         .procname       =       "accept_ra_pinfo",
3823                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3824                         .maxlen         =       sizeof(int),
3825                         .mode           =       0644,
3826                         .proc_handler   =       &proc_dointvec,
3827                 },
3828 #ifdef CONFIG_IPV6_ROUTER_PREF
3829                 {
3830                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3831                         .procname       =       "accept_ra_rtr_pref",
3832                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3833                         .maxlen         =       sizeof(int),
3834                         .mode           =       0644,
3835                         .proc_handler   =       &proc_dointvec,
3836                 },
3837                 {
3838                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3839                         .procname       =       "router_probe_interval",
3840                         .data           =       &ipv6_devconf.rtr_probe_interval,
3841                         .maxlen         =       sizeof(int),
3842                         .mode           =       0644,
3843                         .proc_handler   =       &proc_dointvec_jiffies,
3844                         .strategy       =       &sysctl_jiffies,
3845                 },
3846 #ifdef CONFIV_IPV6_ROUTE_INFO
3847                 {
3848                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3849                         .procname       =       "accept_ra_rt_info_max_plen",
3850                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
3851                         .maxlen         =       sizeof(int),
3852                         .mode           =       0644,
3853                         .proc_handler   =       &proc_dointvec,
3854                 },
3855 #endif
3856 #endif
3857                 {
3858                         .ctl_name       =       0,      /* sentinel */
3859                 }
3860         },
3861         .addrconf_dev = {
3862                 {
3863                         .ctl_name       =       NET_PROTO_CONF_ALL,
3864                         .procname       =       "all",
3865                         .mode           =       0555,
3866                         .child          =       addrconf_sysctl.addrconf_vars,
3867                 },
3868                 {
3869                         .ctl_name       =       0,      /* sentinel */
3870                 }
3871         },
3872         .addrconf_conf_dir = {
3873                 {
3874                         .ctl_name       =       NET_IPV6_CONF,
3875                         .procname       =       "conf",
3876                         .mode           =       0555,
3877                         .child          =       addrconf_sysctl.addrconf_dev,
3878                 },
3879                 {
3880                         .ctl_name       =       0,      /* sentinel */
3881                 }
3882         },
3883         .addrconf_proto_dir = {
3884                 {
3885                         .ctl_name       =       NET_IPV6,
3886                         .procname       =       "ipv6",
3887                         .mode           =       0555,
3888                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3889                 },
3890                 {
3891                         .ctl_name       =       0,      /* sentinel */
3892                 }
3893         },
3894         .addrconf_root_dir = {
3895                 {
3896                         .ctl_name       =       CTL_NET,
3897                         .procname       =       "net",
3898                         .mode           =       0555,
3899                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3900                 },
3901                 {
3902                         .ctl_name       =       0,      /* sentinel */
3903                 }
3904         },
3905 };
3906
3907 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3908 {
3909         int i;
3910         struct net_device *dev = idev ? idev->dev : NULL;
3911         struct addrconf_sysctl_table *t;
3912         char *dev_name = NULL;
3913
3914         t = kmalloc(sizeof(*t), GFP_KERNEL);
3915         if (t == NULL)
3916                 return;
3917         memcpy(t, &addrconf_sysctl, sizeof(*t));
3918         for (i=0; t->addrconf_vars[i].data; i++) {
3919                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3920                 t->addrconf_vars[i].de = NULL;
3921                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3922         }
3923         if (dev) {
3924                 dev_name = dev->name;
3925                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3926         } else {
3927                 dev_name = "default";
3928                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3929         }
3930
3931         /*
3932          * Make a copy of dev_name, because '.procname' is regarded as const
3933          * by sysctl and we wouldn't want anyone to change it under our feet
3934          * (see SIOCSIFNAME).
3935          */
3936         dev_name = kstrdup(dev_name, GFP_KERNEL);
3937         if (!dev_name)
3938             goto free;
3939
3940         t->addrconf_dev[0].procname = dev_name;
3941
3942         t->addrconf_dev[0].child = t->addrconf_vars;
3943         t->addrconf_dev[0].de = NULL;
3944         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3945         t->addrconf_conf_dir[0].de = NULL;
3946         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3947         t->addrconf_proto_dir[0].de = NULL;
3948         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3949         t->addrconf_root_dir[0].de = NULL;
3950
3951         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3952         if (t->sysctl_header == NULL)
3953                 goto free_procname;
3954         else
3955                 p->sysctl = t;
3956         return;
3957
3958         /* error path */
3959  free_procname:
3960         kfree(dev_name);
3961  free:
3962         kfree(t);
3963
3964         return;
3965 }
3966
3967 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3968 {
3969         if (p->sysctl) {
3970                 struct addrconf_sysctl_table *t = p->sysctl;
3971                 p->sysctl = NULL;
3972                 unregister_sysctl_table(t->sysctl_header);
3973                 kfree(t->addrconf_dev[0].procname);
3974                 kfree(t);
3975         }
3976 }
3977
3978
3979 #endif
3980
3981 /*
3982  *      Device notifier
3983  */
3984
3985 int register_inet6addr_notifier(struct notifier_block *nb)
3986 {
3987         return atomic_notifier_chain_register(&inet6addr_chain, nb);
3988 }
3989
3990 int unregister_inet6addr_notifier(struct notifier_block *nb)
3991 {
3992         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
3993 }
3994
3995 /*
3996  *      Init / cleanup code
3997  */
3998
3999 int __init addrconf_init(void)
4000 {
4001         int err = 0;
4002
4003         /* The addrconf netdev notifier requires that loopback_dev
4004          * has it's ipv6 private information allocated and setup
4005          * before it can bring up and give link-local addresses
4006          * to other devices which are up.
4007          *
4008          * Unfortunately, loopback_dev is not necessarily the first
4009          * entry in the global dev_base list of net devices.  In fact,
4010          * it is likely to be the very last entry on that list.
4011          * So this causes the notifier registry below to try and
4012          * give link-local addresses to all devices besides loopback_dev
4013          * first, then loopback_dev, which cases all the non-loopback_dev
4014          * devices to fail to get a link-local address.
4015          *
4016          * So, as a temporary fix, allocate the ipv6 structure for
4017          * loopback_dev first by hand.
4018          * Longer term, all of the dependencies ipv6 has upon the loopback
4019          * device and it being up should be removed.
4020          */
4021         rtnl_lock();
4022         if (!ipv6_add_dev(&loopback_dev))
4023                 err = -ENOMEM;
4024         rtnl_unlock();
4025         if (err)
4026                 return err;
4027
4028         ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4029
4030         register_netdevice_notifier(&ipv6_dev_notf);
4031
4032         addrconf_verify(0);
4033         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4034 #ifdef CONFIG_SYSCTL
4035         addrconf_sysctl.sysctl_header =
4036                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
4037         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4038 #endif
4039
4040         return 0;
4041 }
4042
4043 void __exit addrconf_cleanup(void)
4044 {
4045         struct net_device *dev;
4046         struct inet6_dev *idev;
4047         struct inet6_ifaddr *ifa;
4048         int i;
4049
4050         unregister_netdevice_notifier(&ipv6_dev_notf);
4051
4052         rtnetlink_links[PF_INET6] = NULL;
4053 #ifdef CONFIG_SYSCTL
4054         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4055         addrconf_sysctl_unregister(&ipv6_devconf);
4056 #endif
4057
4058         rtnl_lock();
4059
4060         /*
4061          *      clean dev list.
4062          */
4063
4064         for (dev=dev_base; dev; dev=dev->next) {
4065                 if ((idev = __in6_dev_get(dev)) == NULL)
4066                         continue;
4067                 addrconf_ifdown(dev, 1);
4068         }
4069         addrconf_ifdown(&loopback_dev, 2);
4070
4071         /*
4072          *      Check hash table.
4073          */
4074
4075         write_lock_bh(&addrconf_hash_lock);
4076         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4077                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4078                         struct inet6_ifaddr *bifa;
4079
4080                         bifa = ifa;
4081                         ifa = ifa->lst_next;
4082                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4083                         /* Do not free it; something is wrong.
4084                            Now we can investigate it with debugger.
4085                          */
4086                 }
4087         }
4088         write_unlock_bh(&addrconf_hash_lock);
4089
4090         del_timer(&addr_chk_timer);
4091
4092         rtnl_unlock();
4093
4094 #ifdef CONFIG_PROC_FS
4095         proc_net_remove("if_inet6");
4096 #endif
4097 }