Pileus Git - ~andy/linux/blob - net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #define pr_fmt(fmt) "IPv6: " fmt
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/kernel.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.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 #include <linux/slab.h>
  59 #ifdef CONFIG_SYSCTL
  60 #include <linux/sysctl.h>
  61 #endif
  62 #include <linux/capability.h>
  63 #include <linux/delay.h>
  64 #include <linux/notifier.h>
  65 #include <linux/string.h>
  66 #include <linux/hash.h>
  67
  68 #include <net/net_namespace.h>
  69 #include <net/sock.h>
  70 #include <net/snmp.h>
  71
  72 #include <net/af_ieee802154.h>
  73 #include <net/ipv6.h>
  74 #include <net/protocol.h>
  75 #include <net/ndisc.h>
  76 #include <net/ip6_route.h>
  77 #include <net/addrconf.h>
  78 #include <net/tcp.h>
  79 #include <net/ip.h>
  80 #include <net/netlink.h>
  81 #include <net/pkt_sched.h>
  82 #include <linux/if_tunnel.h>
  83 #include <linux/rtnetlink.h>
  84
  85 #ifdef CONFIG_IPV6_PRIVACY
  86 #include <linux/random.h>
  87 #endif
  88
  89 #include <linux/uaccess.h>
  90 #include <asm/unaligned.h>
  91
  92 #include <linux/proc_fs.h>
  93 #include <linux/seq_file.h>
  94 #include <linux/export.h>
  95
  96 /* Set to 3 to get tracing... */
  97 #define ACONF_DEBUG 2
  98
  99 #if ACONF_DEBUG >= 3
 100 #define ADBG(x) printk x
 101 #else
 102 #define ADBG(x)
 103 #endif
 104
 105 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 106
 107 static inline u32 cstamp_delta(unsigned long cstamp)
 108 {
 109         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 110 }
 111
 112 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
 113 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
 114 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
 115
 116 #ifdef CONFIG_SYSCTL
 117 static void addrconf_sysctl_register(struct inet6_dev *idev);
 118 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 119 #else
 120 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 121 {
 122 }
 123
 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 125 {
 126 }
 127 #endif
 128
 129 #ifdef CONFIG_IPV6_PRIVACY
 130 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 131 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 132 static void ipv6_regen_rndid(unsigned long data);
 133 #endif
 134
 135 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 136 static int ipv6_count_addresses(struct inet6_dev *idev);
 137
 138 /*
 139  *      Configured unicast address hash table
 140  */
 141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 142 static DEFINE_SPINLOCK(addrconf_hash_lock);
 143
 144 static void addrconf_verify(unsigned long);
 145
 146 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 147 static DEFINE_SPINLOCK(addrconf_verify_lock);
 148
 149 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 150 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 151
 152 static void addrconf_type_change(struct net_device *dev,
 153                                  unsigned long event);
 154 static int addrconf_ifdown(struct net_device *dev, int how);
 155
 156 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 157 static void addrconf_dad_timer(unsigned long data);
 158 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 159 static void addrconf_dad_run(struct inet6_dev *idev);
 160 static void addrconf_rs_timer(unsigned long data);
 161 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 162 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 163
 164 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 165                                 struct prefix_info *pinfo);
 166 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 167                                struct net_device *dev);
 168
 169 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 170
 171 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 172         .forwarding             = 0,
 173         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 174         .mtu6                   = IPV6_MIN_MTU,
 175         .accept_ra              = 1,
 176         .accept_redirects       = 1,
 177         .autoconf               = 1,
 178         .force_mld_version      = 0,
 179         .dad_transmits          = 1,
 180         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 181         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 182         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 183 #ifdef CONFIG_IPV6_PRIVACY
 184         .use_tempaddr           = 0,
 185         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 186         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 187         .regen_max_retry        = REGEN_MAX_RETRY,
 188         .max_desync_factor      = MAX_DESYNC_FACTOR,
 189 #endif
 190         .max_addresses          = IPV6_MAX_ADDRESSES,
 191         .accept_ra_defrtr       = 1,
 192         .accept_ra_pinfo        = 1,
 193 #ifdef CONFIG_IPV6_ROUTER_PREF
 194         .accept_ra_rtr_pref     = 1,
 195         .rtr_probe_interval     = 60 * HZ,
 196 #ifdef CONFIG_IPV6_ROUTE_INFO
 197         .accept_ra_rt_info_max_plen = 0,
 198 #endif
 199 #endif
 200         .proxy_ndp              = 0,
 201         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 202         .disable_ipv6           = 0,
 203         .accept_dad             = 1,
 204 };
 205
 206 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 207         .forwarding             = 0,
 208         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 209         .mtu6                   = IPV6_MIN_MTU,
 210         .accept_ra              = 1,
 211         .accept_redirects       = 1,
 212         .autoconf               = 1,
 213         .dad_transmits          = 1,
 214         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 215         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 216         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 217 #ifdef CONFIG_IPV6_PRIVACY
 218         .use_tempaddr           = 0,
 219         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 220         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 221         .regen_max_retry        = REGEN_MAX_RETRY,
 222         .max_desync_factor      = MAX_DESYNC_FACTOR,
 223 #endif
 224         .max_addresses          = IPV6_MAX_ADDRESSES,
 225         .accept_ra_defrtr       = 1,
 226         .accept_ra_pinfo        = 1,
 227 #ifdef CONFIG_IPV6_ROUTER_PREF
 228         .accept_ra_rtr_pref     = 1,
 229         .rtr_probe_interval     = 60 * HZ,
 230 #ifdef CONFIG_IPV6_ROUTE_INFO
 231         .accept_ra_rt_info_max_plen = 0,
 232 #endif
 233 #endif
 234         .proxy_ndp              = 0,
 235         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 236         .disable_ipv6           = 0,
 237         .accept_dad             = 1,
 238 };
 239
 240 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 241 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 242 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 243 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 244 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 245
 246 /* Check if a valid qdisc is available */
 247 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 248 {
 249         return !qdisc_tx_is_noop(dev);
 250 }
 251
 252 /* Check if a route is valid prefix route */
 253 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
 254 {
 255         return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
 256 }
 257
 258 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 259 {
 260         if (del_timer(&ifp->timer))
 261                 __in6_ifa_put(ifp);
 262 }
 263
 264 enum addrconf_timer_t {
 265         AC_NONE,
 266         AC_DAD,
 267         AC_RS,
 268 };
 269
 270 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 271                                enum addrconf_timer_t what,
 272                                unsigned long when)
 273 {
 274         if (!del_timer(&ifp->timer))
 275                 in6_ifa_hold(ifp);
 276
 277         switch (what) {
 278         case AC_DAD:
 279                 ifp->timer.function = addrconf_dad_timer;
 280                 break;
 281         case AC_RS:
 282                 ifp->timer.function = addrconf_rs_timer;
 283                 break;
 284         default:
 285                 break;
 286         }
 287         ifp->timer.expires = jiffies + when;
 288         add_timer(&ifp->timer);
 289 }
 290
 291 static int snmp6_alloc_dev(struct inet6_dev *idev)
 292 {
 293         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 294                           sizeof(struct ipstats_mib),
 295                           __alignof__(struct ipstats_mib)) < 0)
 296                 goto err_ip;
 297         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 298                                         GFP_KERNEL);
 299         if (!idev->stats.icmpv6dev)
 300                 goto err_icmp;
 301         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 302                                            GFP_KERNEL);
 303         if (!idev->stats.icmpv6msgdev)
 304                 goto err_icmpmsg;
 305
 306         return 0;
 307
 308 err_icmpmsg:
 309         kfree(idev->stats.icmpv6dev);
 310 err_icmp:
 311         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 312 err_ip:
 313         return -ENOMEM;
 314 }
 315
 316 static void snmp6_free_dev(struct inet6_dev *idev)
 317 {
 318         kfree(idev->stats.icmpv6msgdev);
 319         kfree(idev->stats.icmpv6dev);
 320         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 321 }
 322
 323 /* Nobody refers to this device, we may destroy it. */
 324
 325 void in6_dev_finish_destroy(struct inet6_dev *idev)
 326 {
 327         struct net_device *dev = idev->dev;
 328
 329         WARN_ON(!list_empty(&idev->addr_list));
 330         WARN_ON(idev->mc_list != NULL);
 331
 332 #ifdef NET_REFCNT_DEBUG
 333         pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
 334 #endif
 335         dev_put(dev);
 336         if (!idev->dead) {
 337                 pr_warn("Freeing alive inet6 device %p\n", idev);
 338                 return;
 339         }
 340         snmp6_free_dev(idev);
 341         kfree_rcu(idev, rcu);
 342 }
 343 EXPORT_SYMBOL(in6_dev_finish_destroy);
 344
 345 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 346 {
 347         struct inet6_dev *ndev;
 348
 349         ASSERT_RTNL();
 350
 351         if (dev->mtu < IPV6_MIN_MTU)
 352                 return NULL;
 353
 354         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 355
 356         if (ndev == NULL)
 357                 return NULL;
 358
 359         rwlock_init(&ndev->lock);
 360         ndev->dev = dev;
 361         INIT_LIST_HEAD(&ndev->addr_list);
 362
 363         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 364         ndev->cnf.mtu6 = dev->mtu;
 365         ndev->cnf.sysctl = NULL;
 366         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 367         if (ndev->nd_parms == NULL) {
 368                 kfree(ndev);
 369                 return NULL;
 370         }
 371         if (ndev->cnf.forwarding)
 372                 dev_disable_lro(dev);
 373         /* We refer to the device */
 374         dev_hold(dev);
 375
 376         if (snmp6_alloc_dev(ndev) < 0) {
 377                 ADBG((KERN_WARNING
 378                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 379                         __func__, dev->name));
 380                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 381                 dev_put(dev);
 382                 kfree(ndev);
 383                 return NULL;
 384         }
 385
 386         if (snmp6_register_dev(ndev) < 0) {
 387                 ADBG((KERN_WARNING
 388                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 389                         __func__, dev->name));
 390                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 391                 ndev->dead = 1;
 392                 in6_dev_finish_destroy(ndev);
 393                 return NULL;
 394         }
 395
 396         /* One reference from device.  We must do this before
 397          * we invoke __ipv6_regen_rndid().
 398          */
 399         in6_dev_hold(ndev);
 400
 401         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 402                 ndev->cnf.accept_dad = -1;
 403
 404 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
 405         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 406                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 407                 ndev->cnf.rtr_solicits = 0;
 408         }
 409 #endif
 410
 411 #ifdef CONFIG_IPV6_PRIVACY
 412         INIT_LIST_HEAD(&ndev->tempaddr_list);
 413         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 414         if ((dev->flags&IFF_LOOPBACK) ||
 415             dev->type == ARPHRD_TUNNEL ||
 416             dev->type == ARPHRD_TUNNEL6 ||
 417             dev->type == ARPHRD_SIT ||
 418             dev->type == ARPHRD_NONE) {
 419                 ndev->cnf.use_tempaddr = -1;
 420         } else {
 421                 in6_dev_hold(ndev);
 422                 ipv6_regen_rndid((unsigned long) ndev);
 423         }
 424 #endif
 425
 426         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 427                 ndev->if_flags |= IF_READY;
 428
 429         ipv6_mc_init_dev(ndev);
 430         ndev->tstamp = jiffies;
 431         addrconf_sysctl_register(ndev);
 432         /* protected by rtnl_lock */
 433         rcu_assign_pointer(dev->ip6_ptr, ndev);
 434
 435         /* Join all-node multicast group */
 436         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 437
 438         /* Join all-router multicast group if forwarding is set */
 439         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 440                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 441
 442         return ndev;
 443 }
 444
 445 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 446 {
 447         struct inet6_dev *idev;
 448
 449         ASSERT_RTNL();
 450
 451         idev = __in6_dev_get(dev);
 452         if (!idev) {
 453                 idev = ipv6_add_dev(dev);
 454                 if (!idev)
 455                         return NULL;
 456         }
 457
 458         if (dev->flags&IFF_UP)
 459                 ipv6_mc_up(idev);
 460         return idev;
 461 }
 462
 463 #ifdef CONFIG_SYSCTL
 464 static void dev_forward_change(struct inet6_dev *idev)
 465 {
 466         struct net_device *dev;
 467         struct inet6_ifaddr *ifa;
 468
 469         if (!idev)
 470                 return;
 471         dev = idev->dev;
 472         if (idev->cnf.forwarding)
 473                 dev_disable_lro(dev);
 474         if (dev && (dev->flags & IFF_MULTICAST)) {
 475                 if (idev->cnf.forwarding)
 476                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 477                 else
 478                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 479         }
 480
 481         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 482                 if (ifa->flags&IFA_F_TENTATIVE)
 483                         continue;
 484                 if (idev->cnf.forwarding)
 485                         addrconf_join_anycast(ifa);
 486                 else
 487                         addrconf_leave_anycast(ifa);
 488         }
 489 }
 490
 491
 492 static void addrconf_forward_change(struct net *net, __s32 newf)
 493 {
 494         struct net_device *dev;
 495         struct inet6_dev *idev;
 496
 497         for_each_netdev(net, dev) {
 498                 idev = __in6_dev_get(dev);
 499                 if (idev) {
 500                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 501                         idev->cnf.forwarding = newf;
 502                         if (changed)
 503                                 dev_forward_change(idev);
 504                 }
 505         }
 506 }
 507
 508 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 509 {
 510         struct net *net;
 511         int old;
 512
 513         if (!rtnl_trylock())
 514                 return restart_syscall();
 515
 516         net = (struct net *)table->extra2;
 517         old = *p;
 518         *p = newf;
 519
 520         if (p == &net->ipv6.devconf_dflt->forwarding) {
 521                 rtnl_unlock();
 522                 return 0;
 523         }
 524
 525         if (p == &net->ipv6.devconf_all->forwarding) {
 526                 net->ipv6.devconf_dflt->forwarding = newf;
 527                 addrconf_forward_change(net, newf);
 528         } else if ((!newf) ^ (!old))
 529                 dev_forward_change((struct inet6_dev *)table->extra1);
 530         rtnl_unlock();
 531
 532         if (newf)
 533                 rt6_purge_dflt_routers(net);
 534         return 1;
 535 }
 536 #endif
 537
 538 /* Nobody refers to this ifaddr, destroy it */
 539 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 540 {
 541         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 542
 543 #ifdef NET_REFCNT_DEBUG
 544         pr_debug("%s\n", __func__);
 545 #endif
 546
 547         in6_dev_put(ifp->idev);
 548
 549         if (del_timer(&ifp->timer))
 550                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 551
 552         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 553                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 554                 return;
 555         }
 556         dst_release(&ifp->rt->dst);
 557
 558         kfree_rcu(ifp, rcu);
 559 }
 560
 561 static void
 562 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 563 {
 564         struct list_head *p;
 565         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 566
 567         /*
 568          * Each device address list is sorted in order of scope -
 569          * global before linklocal.
 570          */
 571         list_for_each(p, &idev->addr_list) {
 572                 struct inet6_ifaddr *ifa
 573                         = list_entry(p, struct inet6_ifaddr, if_list);
 574                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 575                         break;
 576         }
 577
 578         list_add_tail(&ifp->if_list, p);
 579 }
 580
 581 static u32 inet6_addr_hash(const struct in6_addr *addr)
 582 {
 583         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 584 }
 585
 586 /* On success it returns ifp with increased reference count */
 587
 588 static struct inet6_ifaddr *
 589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 590               int scope, u32 flags)
 591 {
 592         struct inet6_ifaddr *ifa = NULL;
 593         struct rt6_info *rt;
 594         unsigned int hash;
 595         int err = 0;
 596         int addr_type = ipv6_addr_type(addr);
 597
 598         if (addr_type == IPV6_ADDR_ANY ||
 599             addr_type & IPV6_ADDR_MULTICAST ||
 600             (!(idev->dev->flags & IFF_LOOPBACK) &&
 601              addr_type & IPV6_ADDR_LOOPBACK))
 602                 return ERR_PTR(-EADDRNOTAVAIL);
 603
 604         rcu_read_lock_bh();
 605         if (idev->dead) {
 606                 err = -ENODEV;                  /*XXX*/
 607                 goto out2;
 608         }
 609
 610         if (idev->cnf.disable_ipv6) {
 611                 err = -EACCES;
 612                 goto out2;
 613         }
 614
 615         spin_lock(&addrconf_hash_lock);
 616
 617         /* Ignore adding duplicate addresses on an interface */
 618         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 619                 ADBG(("ipv6_add_addr: already assigned\n"));
 620                 err = -EEXIST;
 621                 goto out;
 622         }
 623
 624         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 625
 626         if (ifa == NULL) {
 627                 ADBG(("ipv6_add_addr: malloc failed\n"));
 628                 err = -ENOBUFS;
 629                 goto out;
 630         }
 631
 632         rt = addrconf_dst_alloc(idev, addr, false);
 633         if (IS_ERR(rt)) {
 634                 err = PTR_ERR(rt);
 635                 goto out;
 636         }
 637
 638         ifa->addr = *addr;
 639
 640         spin_lock_init(&ifa->lock);
 641         spin_lock_init(&ifa->state_lock);
 642         init_timer(&ifa->timer);
 643         INIT_HLIST_NODE(&ifa->addr_lst);
 644         ifa->timer.data = (unsigned long) ifa;
 645         ifa->scope = scope;
 646         ifa->prefix_len = pfxlen;
 647         ifa->flags = flags | IFA_F_TENTATIVE;
 648         ifa->cstamp = ifa->tstamp = jiffies;
 649
 650         ifa->rt = rt;
 651
 652         ifa->idev = idev;
 653         in6_dev_hold(idev);
 654         /* For caller */
 655         in6_ifa_hold(ifa);
 656
 657         /* Add to big hash table */
 658         hash = inet6_addr_hash(addr);
 659
 660         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 661         spin_unlock(&addrconf_hash_lock);
 662
 663         write_lock(&idev->lock);
 664         /* Add to inet6_dev unicast addr list. */
 665         ipv6_link_dev_addr(idev, ifa);
 666
 667 #ifdef CONFIG_IPV6_PRIVACY
 668         if (ifa->flags&IFA_F_TEMPORARY) {
 669                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 670                 in6_ifa_hold(ifa);
 671         }
 672 #endif
 673
 674         in6_ifa_hold(ifa);
 675         write_unlock(&idev->lock);
 676 out2:
 677         rcu_read_unlock_bh();
 678
 679         if (likely(err == 0))
 680                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 681         else {
 682                 kfree(ifa);
 683                 ifa = ERR_PTR(err);
 684         }
 685
 686         return ifa;
 687 out:
 688         spin_unlock(&addrconf_hash_lock);
 689         goto out2;
 690 }
 691
 692 /* This function wants to get referenced ifp and releases it before return */
 693
 694 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 695 {
 696         struct inet6_ifaddr *ifa, *ifn;
 697         struct inet6_dev *idev = ifp->idev;
 698         int state;
 699         int deleted = 0, onlink = 0;
 700         unsigned long expires = jiffies;
 701
 702         spin_lock_bh(&ifp->state_lock);
 703         state = ifp->state;
 704         ifp->state = INET6_IFADDR_STATE_DEAD;
 705         spin_unlock_bh(&ifp->state_lock);
 706
 707         if (state == INET6_IFADDR_STATE_DEAD)
 708                 goto out;
 709
 710         spin_lock_bh(&addrconf_hash_lock);
 711         hlist_del_init_rcu(&ifp->addr_lst);
 712         spin_unlock_bh(&addrconf_hash_lock);
 713
 714         write_lock_bh(&idev->lock);
 715 #ifdef CONFIG_IPV6_PRIVACY
 716         if (ifp->flags&IFA_F_TEMPORARY) {
 717                 list_del(&ifp->tmp_list);
 718                 if (ifp->ifpub) {
 719                         in6_ifa_put(ifp->ifpub);
 720                         ifp->ifpub = NULL;
 721                 }
 722                 __in6_ifa_put(ifp);
 723         }
 724 #endif
 725
 726         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 727                 if (ifa == ifp) {
 728                         list_del_init(&ifp->if_list);
 729                         __in6_ifa_put(ifp);
 730
 731                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 732                                 break;
 733                         deleted = 1;
 734                         continue;
 735                 } else if (ifp->flags & IFA_F_PERMANENT) {
 736                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 737                                               ifp->prefix_len)) {
 738                                 if (ifa->flags & IFA_F_PERMANENT) {
 739                                         onlink = 1;
 740                                         if (deleted)
 741                                                 break;
 742                                 } else {
 743                                         unsigned long lifetime;
 744
 745                                         if (!onlink)
 746                                                 onlink = -1;
 747
 748                                         spin_lock(&ifa->lock);
 749
 750                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 751                                         /*
 752                                          * Note: Because this address is
 753                                          * not permanent, lifetime <
 754                                          * LONG_MAX / HZ here.
 755                                          */
 756                                         if (time_before(expires,
 757                                                         ifa->tstamp + lifetime * HZ))
 758                                                 expires = ifa->tstamp + lifetime * HZ;
 759                                         spin_unlock(&ifa->lock);
 760                                 }
 761                         }
 762                 }
 763         }
 764         write_unlock_bh(&idev->lock);
 765
 766         addrconf_del_timer(ifp);
 767
 768         ipv6_ifa_notify(RTM_DELADDR, ifp);
 769
 770         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 771
 772         /*
 773          * Purge or update corresponding prefix
 774          *
 775          * 1) we don't purge prefix here if address was not permanent.
 776          *    prefix is managed by its own lifetime.
 777          * 2) if there're no addresses, delete prefix.
 778          * 3) if there're still other permanent address(es),
 779          *    corresponding prefix is still permanent.
 780          * 4) otherwise, update prefix lifetime to the
 781          *    longest valid lifetime among the corresponding
 782          *    addresses on the device.
 783          *    Note: subsequent RA will update lifetime.
 784          *
 785          * --yoshfuji
 786          */
 787         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 788                 struct in6_addr prefix;
 789                 struct rt6_info *rt;
 790                 struct net *net = dev_net(ifp->idev->dev);
 791                 struct flowi6 fl6 = {};
 792
 793                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 794                 fl6.flowi6_oif = ifp->idev->dev->ifindex;
 795                 fl6.daddr = prefix;
 796                 rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
 797                                                          RT6_LOOKUP_F_IFACE);
 798
 799                 if (rt != net->ipv6.ip6_null_entry &&
 800                     addrconf_is_prefix_route(rt)) {
 801                         if (onlink == 0) {
 802                                 ip6_del_rt(rt);
 803                                 rt = NULL;
 804                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 805                                 rt6_set_expires(rt, expires);
 806                         }
 807                 }
 808                 dst_release(&rt->dst);
 809         }
 810
 811         /* clean up prefsrc entries */
 812         rt6_remove_prefsrc(ifp);
 813 out:
 814         in6_ifa_put(ifp);
 815 }
 816
 817 #ifdef CONFIG_IPV6_PRIVACY
 818 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 819 {
 820         struct inet6_dev *idev = ifp->idev;
 821         struct in6_addr addr, *tmpaddr;
 822         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
 823         unsigned long regen_advance;
 824         int tmp_plen;
 825         int ret = 0;
 826         int max_addresses;
 827         u32 addr_flags;
 828         unsigned long now = jiffies;
 829
 830         write_lock(&idev->lock);
 831         if (ift) {
 832                 spin_lock_bh(&ift->lock);
 833                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 834                 spin_unlock_bh(&ift->lock);
 835                 tmpaddr = &addr;
 836         } else {
 837                 tmpaddr = NULL;
 838         }
 839 retry:
 840         in6_dev_hold(idev);
 841         if (idev->cnf.use_tempaddr <= 0) {
 842                 write_unlock(&idev->lock);
 843                 pr_info("%s: use_tempaddr is disabled\n", __func__);
 844                 in6_dev_put(idev);
 845                 ret = -1;
 846                 goto out;
 847         }
 848         spin_lock_bh(&ifp->lock);
 849         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
 850                 idev->cnf.use_tempaddr = -1;    /*XXX*/
 851                 spin_unlock_bh(&ifp->lock);
 852                 write_unlock(&idev->lock);
 853                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
 854                         __func__);
 855                 in6_dev_put(idev);
 856                 ret = -1;
 857                 goto out;
 858         }
 859         in6_ifa_hold(ifp);
 860         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
 861         __ipv6_try_regen_rndid(idev, tmpaddr);
 862         memcpy(&addr.s6_addr[8], idev->rndid, 8);
 863         age = (now - ifp->tstamp) / HZ;
 864         tmp_valid_lft = min_t(__u32,
 865                               ifp->valid_lft,
 866                               idev->cnf.temp_valid_lft + age);
 867         tmp_prefered_lft = min_t(__u32,
 868                                  ifp->prefered_lft,
 869                                  idev->cnf.temp_prefered_lft + age -
 870                                  idev->cnf.max_desync_factor);
 871         tmp_plen = ifp->prefix_len;
 872         max_addresses = idev->cnf.max_addresses;
 873         tmp_tstamp = ifp->tstamp;
 874         spin_unlock_bh(&ifp->lock);
 875
 876         regen_advance = idev->cnf.regen_max_retry *
 877                         idev->cnf.dad_transmits *
 878                         idev->nd_parms->retrans_time / HZ;
 879         write_unlock(&idev->lock);
 880
 881         /* A temporary address is created only if this calculated Preferred
 882          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
 883          * an implementation must not create a temporary address with a zero
 884          * Preferred Lifetime.
 885          */
 886         if (tmp_prefered_lft <= regen_advance) {
 887                 in6_ifa_put(ifp);
 888                 in6_dev_put(idev);
 889                 ret = -1;
 890                 goto out;
 891         }
 892
 893         addr_flags = IFA_F_TEMPORARY;
 894         /* set in addrconf_prefix_rcv() */
 895         if (ifp->flags & IFA_F_OPTIMISTIC)
 896                 addr_flags |= IFA_F_OPTIMISTIC;
 897
 898         ift = !max_addresses ||
 899               ipv6_count_addresses(idev) < max_addresses ?
 900                 ipv6_add_addr(idev, &addr, tmp_plen,
 901                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
 902                               addr_flags) : NULL;
 903         if (!ift || IS_ERR(ift)) {
 904                 in6_ifa_put(ifp);
 905                 in6_dev_put(idev);
 906                 pr_info("%s: retry temporary address regeneration\n", __func__);
 907                 tmpaddr = &addr;
 908                 write_lock(&idev->lock);
 909                 goto retry;
 910         }
 911
 912         spin_lock_bh(&ift->lock);
 913         ift->ifpub = ifp;
 914         ift->valid_lft = tmp_valid_lft;
 915         ift->prefered_lft = tmp_prefered_lft;
 916         ift->cstamp = now;
 917         ift->tstamp = tmp_tstamp;
 918         spin_unlock_bh(&ift->lock);
 919
 920         addrconf_dad_start(ift);
 921         in6_ifa_put(ift);
 922         in6_dev_put(idev);
 923 out:
 924         return ret;
 925 }
 926 #endif
 927
 928 /*
 929  *      Choose an appropriate source address (RFC3484)
 930  */
 931 enum {
 932         IPV6_SADDR_RULE_INIT = 0,
 933         IPV6_SADDR_RULE_LOCAL,
 934         IPV6_SADDR_RULE_SCOPE,
 935         IPV6_SADDR_RULE_PREFERRED,
 936 #ifdef CONFIG_IPV6_MIP6
 937         IPV6_SADDR_RULE_HOA,
 938 #endif
 939         IPV6_SADDR_RULE_OIF,
 940         IPV6_SADDR_RULE_LABEL,
 941 #ifdef CONFIG_IPV6_PRIVACY
 942         IPV6_SADDR_RULE_PRIVACY,
 943 #endif
 944         IPV6_SADDR_RULE_ORCHID,
 945         IPV6_SADDR_RULE_PREFIX,
 946         IPV6_SADDR_RULE_MAX
 947 };
 948
 949 struct ipv6_saddr_score {
 950         int                     rule;
 951         int                     addr_type;
 952         struct inet6_ifaddr     *ifa;
 953         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
 954         int                     scopedist;
 955         int                     matchlen;
 956 };
 957
 958 struct ipv6_saddr_dst {
 959         const struct in6_addr *addr;
 960         int ifindex;
 961         int scope;
 962         int label;
 963         unsigned int prefs;
 964 };
 965
 966 static inline int ipv6_saddr_preferred(int type)
 967 {
 968         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
 969                 return 1;
 970         return 0;
 971 }
 972
 973 static int ipv6_get_saddr_eval(struct net *net,
 974                                struct ipv6_saddr_score *score,
 975                                struct ipv6_saddr_dst *dst,
 976                                int i)
 977 {
 978         int ret;
 979
 980         if (i <= score->rule) {
 981                 switch (i) {
 982                 case IPV6_SADDR_RULE_SCOPE:
 983                         ret = score->scopedist;
 984                         break;
 985                 case IPV6_SADDR_RULE_PREFIX:
 986                         ret = score->matchlen;
 987                         break;
 988                 default:
 989                         ret = !!test_bit(i, score->scorebits);
 990                 }
 991                 goto out;
 992         }
 993
 994         switch (i) {
 995         case IPV6_SADDR_RULE_INIT:
 996                 /* Rule 0: remember if hiscore is not ready yet */
 997                 ret = !!score->ifa;
 998                 break;
 999         case IPV6_SADDR_RULE_LOCAL:
1000                 /* Rule 1: Prefer same address */
1001                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1002                 break;
1003         case IPV6_SADDR_RULE_SCOPE:
1004                 /* Rule 2: Prefer appropriate scope
1005                  *
1006                  *      ret
1007                  *       ^
1008                  *    -1 |  d 15
1009                  *    ---+--+-+---> scope
1010                  *       |
1011                  *       |             d is scope of the destination.
1012                  *  B-d  |  \
1013                  *       |   \      <- smaller scope is better if
1014                  *  B-15 |    \        if scope is enough for destinaion.
1015                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1016                  * d-C-1 | /
1017                  *       |/         <- greater is better
1018                  *   -C  /             if scope is not enough for destination.
1019                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1020                  *
1021                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1022                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1023                  * Assume B = 0 and we get C > 29.
1024                  */
1025                 ret = __ipv6_addr_src_scope(score->addr_type);
1026                 if (ret >= dst->scope)
1027                         ret = -ret;
1028                 else
1029                         ret -= 128;     /* 30 is enough */
1030                 score->scopedist = ret;
1031                 break;
1032         case IPV6_SADDR_RULE_PREFERRED:
1033                 /* Rule 3: Avoid deprecated and optimistic addresses */
1034                 ret = ipv6_saddr_preferred(score->addr_type) ||
1035                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1036                 break;
1037 #ifdef CONFIG_IPV6_MIP6
1038         case IPV6_SADDR_RULE_HOA:
1039             {
1040                 /* Rule 4: Prefer home address */
1041                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1042                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1043                 break;
1044             }
1045 #endif
1046         case IPV6_SADDR_RULE_OIF:
1047                 /* Rule 5: Prefer outgoing interface */
1048                 ret = (!dst->ifindex ||
1049                        dst->ifindex == score->ifa->idev->dev->ifindex);
1050                 break;
1051         case IPV6_SADDR_RULE_LABEL:
1052                 /* Rule 6: Prefer matching label */
1053                 ret = ipv6_addr_label(net,
1054                                       &score->ifa->addr, score->addr_type,
1055                                       score->ifa->idev->dev->ifindex) == dst->label;
1056                 break;
1057 #ifdef CONFIG_IPV6_PRIVACY
1058         case IPV6_SADDR_RULE_PRIVACY:
1059             {
1060                 /* Rule 7: Prefer public address
1061                  * Note: prefer temporary address if use_tempaddr >= 2
1062                  */
1063                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1064                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1065                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1066                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1067                 break;
1068             }
1069 #endif
1070         case IPV6_SADDR_RULE_ORCHID:
1071                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1072                  *          non-ORCHID vs non-ORCHID
1073                  */
1074                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1075                         ipv6_addr_orchid(dst->addr));
1076                 break;
1077         case IPV6_SADDR_RULE_PREFIX:
1078                 /* Rule 8: Use longest matching prefix */
1079                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1080                 if (ret > score->ifa->prefix_len)
1081                         ret = score->ifa->prefix_len;
1082                 score->matchlen = ret;
1083                 break;
1084         default:
1085                 ret = 0;
1086         }
1087
1088         if (ret)
1089                 __set_bit(i, score->scorebits);
1090         score->rule = i;
1091 out:
1092         return ret;
1093 }
1094
1095 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1096                        const struct in6_addr *daddr, unsigned int prefs,
1097                        struct in6_addr *saddr)
1098 {
1099         struct ipv6_saddr_score scores[2],
1100                                 *score = &scores[0], *hiscore = &scores[1];
1101         struct ipv6_saddr_dst dst;
1102         struct net_device *dev;
1103         int dst_type;
1104
1105         dst_type = __ipv6_addr_type(daddr);
1106         dst.addr = daddr;
1107         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1108         dst.scope = __ipv6_addr_src_scope(dst_type);
1109         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1110         dst.prefs = prefs;
1111
1112         hiscore->rule = -1;
1113         hiscore->ifa = NULL;
1114
1115         rcu_read_lock();
1116
1117         for_each_netdev_rcu(net, dev) {
1118                 struct inet6_dev *idev;
1119
1120                 /* Candidate Source Address (section 4)
1121                  *  - multicast and link-local destination address,
1122                  *    the set of candidate source address MUST only
1123                  *    include addresses assigned to interfaces
1124                  *    belonging to the same link as the outgoing
1125                  *    interface.
1126                  * (- For site-local destination addresses, the
1127                  *    set of candidate source addresses MUST only
1128                  *    include addresses assigned to interfaces
1129                  *    belonging to the same site as the outgoing
1130                  *    interface.)
1131                  */
1132                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1133                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1134                     dst.ifindex && dev->ifindex != dst.ifindex)
1135                         continue;
1136
1137                 idev = __in6_dev_get(dev);
1138                 if (!idev)
1139                         continue;
1140
1141                 read_lock_bh(&idev->lock);
1142                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1143                         int i;
1144
1145                         /*
1146                          * - Tentative Address (RFC2462 section 5.4)
1147                          *  - A tentative address is not considered
1148                          *    "assigned to an interface" in the traditional
1149                          *    sense, unless it is also flagged as optimistic.
1150                          * - Candidate Source Address (section 4)
1151                          *  - In any case, anycast addresses, multicast
1152                          *    addresses, and the unspecified address MUST
1153                          *    NOT be included in a candidate set.
1154                          */
1155                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1156                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1157                                 continue;
1158
1159                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1160
1161                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1162                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1163                                 LIMIT_NETDEBUG(KERN_DEBUG
1164                                                "ADDRCONF: unspecified / multicast address "
1165                                                "assigned as unicast address on %s",
1166                                                dev->name);
1167                                 continue;
1168                         }
1169
1170                         score->rule = -1;
1171                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1172
1173                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1174                                 int minihiscore, miniscore;
1175
1176                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1177                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1178
1179                                 if (minihiscore > miniscore) {
1180                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1181                                             score->scopedist > 0) {
1182                                                 /*
1183                                                  * special case:
1184                                                  * each remaining entry
1185                                                  * has too small (not enough)
1186                                                  * scope, because ifa entries
1187                                                  * are sorted by their scope
1188                                                  * values.
1189                                                  */
1190                                                 goto try_nextdev;
1191                                         }
1192                                         break;
1193                                 } else if (minihiscore < miniscore) {
1194                                         if (hiscore->ifa)
1195                                                 in6_ifa_put(hiscore->ifa);
1196
1197                                         in6_ifa_hold(score->ifa);
1198
1199                                         swap(hiscore, score);
1200
1201                                         /* restore our iterator */
1202                                         score->ifa = hiscore->ifa;
1203
1204                                         break;
1205                                 }
1206                         }
1207                 }
1208 try_nextdev:
1209                 read_unlock_bh(&idev->lock);
1210         }
1211         rcu_read_unlock();
1212
1213         if (!hiscore->ifa)
1214                 return -EADDRNOTAVAIL;
1215
1216         *saddr = hiscore->ifa->addr;
1217         in6_ifa_put(hiscore->ifa);
1218         return 0;
1219 }
1220 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1221
1222 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1223                     unsigned char banned_flags)
1224 {
1225         struct inet6_dev *idev;
1226         int err = -EADDRNOTAVAIL;
1227
1228         rcu_read_lock();
1229         idev = __in6_dev_get(dev);
1230         if (idev) {
1231                 struct inet6_ifaddr *ifp;
1232
1233                 read_lock_bh(&idev->lock);
1234                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1235                         if (ifp->scope == IFA_LINK &&
1236                             !(ifp->flags & banned_flags)) {
1237                                 *addr = ifp->addr;
1238                                 err = 0;
1239                                 break;
1240                         }
1241                 }
1242                 read_unlock_bh(&idev->lock);
1243         }
1244         rcu_read_unlock();
1245         return err;
1246 }
1247
1248 static int ipv6_count_addresses(struct inet6_dev *idev)
1249 {
1250         int cnt = 0;
1251         struct inet6_ifaddr *ifp;
1252
1253         read_lock_bh(&idev->lock);
1254         list_for_each_entry(ifp, &idev->addr_list, if_list)
1255                 cnt++;
1256         read_unlock_bh(&idev->lock);
1257         return cnt;
1258 }
1259
1260 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1261                   struct net_device *dev, int strict)
1262 {
1263         struct inet6_ifaddr *ifp;
1264         struct hlist_node *node;
1265         unsigned int hash = inet6_addr_hash(addr);
1266
1267         rcu_read_lock_bh();
1268         hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1269                 if (!net_eq(dev_net(ifp->idev->dev), net))
1270                         continue;
1271                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1272                     !(ifp->flags&IFA_F_TENTATIVE) &&
1273                     (dev == NULL || ifp->idev->dev == dev ||
1274                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1275                         rcu_read_unlock_bh();
1276                         return 1;
1277                 }
1278         }
1279
1280         rcu_read_unlock_bh();
1281         return 0;
1282 }
1283 EXPORT_SYMBOL(ipv6_chk_addr);
1284
1285 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1286                                struct net_device *dev)
1287 {
1288         unsigned int hash = inet6_addr_hash(addr);
1289         struct inet6_ifaddr *ifp;
1290         struct hlist_node *node;
1291
1292         hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1293                 if (!net_eq(dev_net(ifp->idev->dev), net))
1294                         continue;
1295                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1296                         if (dev == NULL || ifp->idev->dev == dev)
1297                                 return true;
1298                 }
1299         }
1300         return false;
1301 }
1302
1303 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1304 {
1305         struct inet6_dev *idev;
1306         struct inet6_ifaddr *ifa;
1307         int     onlink;
1308
1309         onlink = 0;
1310         rcu_read_lock();
1311         idev = __in6_dev_get(dev);
1312         if (idev) {
1313                 read_lock_bh(&idev->lock);
1314                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1315                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1316                                                    ifa->prefix_len);
1317                         if (onlink)
1318                                 break;
1319                 }
1320                 read_unlock_bh(&idev->lock);
1321         }
1322         rcu_read_unlock();
1323         return onlink;
1324 }
1325 EXPORT_SYMBOL(ipv6_chk_prefix);
1326
1327 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1328                                      struct net_device *dev, int strict)
1329 {
1330         struct inet6_ifaddr *ifp, *result = NULL;
1331         unsigned int hash = inet6_addr_hash(addr);
1332         struct hlist_node *node;
1333
1334         rcu_read_lock_bh();
1335         hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1336                 if (!net_eq(dev_net(ifp->idev->dev), net))
1337                         continue;
1338                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1339                         if (dev == NULL || ifp->idev->dev == dev ||
1340                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1341                                 result = ifp;
1342                                 in6_ifa_hold(ifp);
1343                                 break;
1344                         }
1345                 }
1346         }
1347         rcu_read_unlock_bh();
1348
1349         return result;
1350 }
1351
1352 /* Gets referenced address, destroys ifaddr */
1353
1354 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1355 {
1356         if (ifp->flags&IFA_F_PERMANENT) {
1357                 spin_lock_bh(&ifp->lock);
1358                 addrconf_del_timer(ifp);
1359                 ifp->flags |= IFA_F_TENTATIVE;
1360                 if (dad_failed)
1361                         ifp->flags |= IFA_F_DADFAILED;
1362                 spin_unlock_bh(&ifp->lock);
1363                 if (dad_failed)
1364                         ipv6_ifa_notify(0, ifp);
1365                 in6_ifa_put(ifp);
1366 #ifdef CONFIG_IPV6_PRIVACY
1367         } else if (ifp->flags&IFA_F_TEMPORARY) {
1368                 struct inet6_ifaddr *ifpub;
1369                 spin_lock_bh(&ifp->lock);
1370                 ifpub = ifp->ifpub;
1371                 if (ifpub) {
1372                         in6_ifa_hold(ifpub);
1373                         spin_unlock_bh(&ifp->lock);
1374                         ipv6_create_tempaddr(ifpub, ifp);
1375                         in6_ifa_put(ifpub);
1376                 } else {
1377                         spin_unlock_bh(&ifp->lock);
1378                 }
1379                 ipv6_del_addr(ifp);
1380 #endif
1381         } else
1382                 ipv6_del_addr(ifp);
1383 }
1384
1385 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1386 {
1387         int err = -ENOENT;
1388
1389         spin_lock(&ifp->state_lock);
1390         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1391                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1392                 err = 0;
1393         }
1394         spin_unlock(&ifp->state_lock);
1395
1396         return err;
1397 }
1398
1399 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1400 {
1401         struct inet6_dev *idev = ifp->idev;
1402
1403         if (addrconf_dad_end(ifp)) {
1404                 in6_ifa_put(ifp);
1405                 return;
1406         }
1407
1408         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1409                              ifp->idev->dev->name, &ifp->addr);
1410
1411         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1412                 struct in6_addr addr;
1413
1414                 addr.s6_addr32[0] = htonl(0xfe800000);
1415                 addr.s6_addr32[1] = 0;
1416
1417                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1418                     ipv6_addr_equal(&ifp->addr, &addr)) {
1419                         /* DAD failed for link-local based on MAC address */
1420                         idev->cnf.disable_ipv6 = 1;
1421
1422                         pr_info("%s: IPv6 being disabled!\n",
1423                                 ifp->idev->dev->name);
1424                 }
1425         }
1426
1427         addrconf_dad_stop(ifp, 1);
1428 }
1429
1430 /* Join to solicited addr multicast group. */
1431
1432 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1433 {
1434         struct in6_addr maddr;
1435
1436         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1437                 return;
1438
1439         addrconf_addr_solict_mult(addr, &maddr);
1440         ipv6_dev_mc_inc(dev, &maddr);
1441 }
1442
1443 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1444 {
1445         struct in6_addr maddr;
1446
1447         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1448                 return;
1449
1450         addrconf_addr_solict_mult(addr, &maddr);
1451         __ipv6_dev_mc_dec(idev, &maddr);
1452 }
1453
1454 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1455 {
1456         struct in6_addr addr;
1457         if (ifp->prefix_len == 127) /* RFC 6164 */
1458                 return;
1459         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1460         if (ipv6_addr_any(&addr))
1461                 return;
1462         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1463 }
1464
1465 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1466 {
1467         struct in6_addr addr;
1468         if (ifp->prefix_len == 127) /* RFC 6164 */
1469                 return;
1470         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1471         if (ipv6_addr_any(&addr))
1472                 return;
1473         __ipv6_dev_ac_dec(ifp->idev, &addr);
1474 }
1475
1476 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1477 {
1478         if (dev->addr_len != ETH_ALEN)
1479                 return -1;
1480         memcpy(eui, dev->dev_addr, 3);
1481         memcpy(eui + 5, dev->dev_addr + 3, 3);
1482
1483         /*
1484          * The zSeries OSA network cards can be shared among various
1485          * OS instances, but the OSA cards have only one MAC address.
1486          * This leads to duplicate address conflicts in conjunction
1487          * with IPv6 if more than one instance uses the same card.
1488          *
1489          * The driver for these cards can deliver a unique 16-bit
1490          * identifier for each instance sharing the same card.  It is
1491          * placed instead of 0xFFFE in the interface identifier.  The
1492          * "u" bit of the interface identifier is not inverted in this
1493          * case.  Hence the resulting interface identifier has local
1494          * scope according to RFC2373.
1495          */
1496         if (dev->dev_id) {
1497                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1498                 eui[4] = dev->dev_id & 0xFF;
1499         } else {
1500                 eui[3] = 0xFF;
1501                 eui[4] = 0xFE;
1502                 eui[0] ^= 2;
1503         }
1504         return 0;
1505 }
1506
1507 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1508 {
1509         if (dev->addr_len != IEEE802154_ADDR_LEN)
1510                 return -1;
1511         memcpy(eui, dev->dev_addr, 8);
1512         return 0;
1513 }
1514
1515 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1516 {
1517         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1518         if (dev->addr_len != ARCNET_ALEN)
1519                 return -1;
1520         memset(eui, 0, 7);
1521         eui[7] = *(u8 *)dev->dev_addr;
1522         return 0;
1523 }
1524
1525 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1526 {
1527         if (dev->addr_len != INFINIBAND_ALEN)
1528                 return -1;
1529         memcpy(eui, dev->dev_addr + 12, 8);
1530         eui[0] |= 2;
1531         return 0;
1532 }
1533
1534 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1535 {
1536         if (addr == 0)
1537                 return -1;
1538         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1539                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1540                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1541                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1542                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1543                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1544         eui[1] = 0;
1545         eui[2] = 0x5E;
1546         eui[3] = 0xFE;
1547         memcpy(eui + 4, &addr, 4);
1548         return 0;
1549 }
1550
1551 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1552 {
1553         if (dev->priv_flags & IFF_ISATAP)
1554                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1555         return -1;
1556 }
1557
1558 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1559 {
1560         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1561 }
1562
1563 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1564 {
1565         switch (dev->type) {
1566         case ARPHRD_ETHER:
1567         case ARPHRD_FDDI:
1568                 return addrconf_ifid_eui48(eui, dev);
1569         case ARPHRD_ARCNET:
1570                 return addrconf_ifid_arcnet(eui, dev);
1571         case ARPHRD_INFINIBAND:
1572                 return addrconf_ifid_infiniband(eui, dev);
1573         case ARPHRD_SIT:
1574                 return addrconf_ifid_sit(eui, dev);
1575         case ARPHRD_IPGRE:
1576                 return addrconf_ifid_gre(eui, dev);
1577         case ARPHRD_IEEE802154:
1578                 return addrconf_ifid_eui64(eui, dev);
1579         }
1580         return -1;
1581 }
1582
1583 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1584 {
1585         int err = -1;
1586         struct inet6_ifaddr *ifp;
1587
1588         read_lock_bh(&idev->lock);
1589         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1590                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1591                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1592                         err = 0;
1593                         break;
1594                 }
1595         }
1596         read_unlock_bh(&idev->lock);
1597         return err;
1598 }
1599
1600 #ifdef CONFIG_IPV6_PRIVACY
1601 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1602 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1603 {
1604 regen:
1605         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1606         idev->rndid[0] &= ~0x02;
1607
1608         /*
1609          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1610          * check if generated address is not inappropriate
1611          *
1612          *  - Reserved subnet anycast (RFC 2526)
1613          *      11111101 11....11 1xxxxxxx
1614          *  - ISATAP (RFC4214) 6.1
1615          *      00-00-5E-FE-xx-xx-xx-xx
1616          *  - value 0
1617          *  - XXX: already assigned to an address on the device
1618          */
1619         if (idev->rndid[0] == 0xfd &&
1620             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1621             (idev->rndid[7]&0x80))
1622                 goto regen;
1623         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1624                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1625                         goto regen;
1626                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1627                         goto regen;
1628         }
1629 }
1630
1631 static void ipv6_regen_rndid(unsigned long data)
1632 {
1633         struct inet6_dev *idev = (struct inet6_dev *) data;
1634         unsigned long expires;
1635
1636         rcu_read_lock_bh();
1637         write_lock_bh(&idev->lock);
1638
1639         if (idev->dead)
1640                 goto out;
1641
1642         __ipv6_regen_rndid(idev);
1643
1644         expires = jiffies +
1645                 idev->cnf.temp_prefered_lft * HZ -
1646                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1647                 idev->cnf.max_desync_factor * HZ;
1648         if (time_before(expires, jiffies)) {
1649                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1650                         __func__, idev->dev->name);
1651                 goto out;
1652         }
1653
1654         if (!mod_timer(&idev->regen_timer, expires))
1655                 in6_dev_hold(idev);
1656
1657 out:
1658         write_unlock_bh(&idev->lock);
1659         rcu_read_unlock_bh();
1660         in6_dev_put(idev);
1661 }
1662
1663 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1664 {
1665         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1666                 __ipv6_regen_rndid(idev);
1667 }
1668 #endif
1669
1670 /*
1671  *      Add prefix route.
1672  */
1673
1674 static void
1675 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1676                       unsigned long expires, u32 flags)
1677 {
1678         struct fib6_config cfg = {
1679                 .fc_table = RT6_TABLE_PREFIX,
1680                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1681                 .fc_ifindex = dev->ifindex,
1682                 .fc_expires = expires,
1683                 .fc_dst_len = plen,
1684                 .fc_flags = RTF_UP | flags,
1685                 .fc_nlinfo.nl_net = dev_net(dev),
1686                 .fc_protocol = RTPROT_KERNEL,
1687         };
1688
1689         cfg.fc_dst = *pfx;
1690
1691         /* Prevent useless cloning on PtP SIT.
1692            This thing is done here expecting that the whole
1693            class of non-broadcast devices need not cloning.
1694          */
1695 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1696         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1697                 cfg.fc_flags |= RTF_NONEXTHOP;
1698 #endif
1699
1700         ip6_route_add(&cfg);
1701 }
1702
1703
1704 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1705                                                   int plen,
1706                                                   const struct net_device *dev,
1707                                                   u32 flags, u32 noflags)
1708 {
1709         struct fib6_node *fn;
1710         struct rt6_info *rt = NULL;
1711         struct fib6_table *table;
1712
1713         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1714         if (table == NULL)
1715                 return NULL;
1716
1717         read_lock_bh(&table->tb6_lock);
1718         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1719         if (!fn)
1720                 goto out;
1721         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1722                 if (rt->dst.dev->ifindex != dev->ifindex)
1723                         continue;
1724                 if ((rt->rt6i_flags & flags) != flags)
1725                         continue;
1726                 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1727                         continue;
1728                 dst_hold(&rt->dst);
1729                 break;
1730         }
1731 out:
1732         read_unlock_bh(&table->tb6_lock);
1733         return rt;
1734 }
1735
1736
1737 /* Create "default" multicast route to the interface */
1738
1739 static void addrconf_add_mroute(struct net_device *dev)
1740 {
1741         struct fib6_config cfg = {
1742                 .fc_table = RT6_TABLE_LOCAL,
1743                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1744                 .fc_ifindex = dev->ifindex,
1745                 .fc_dst_len = 8,
1746                 .fc_flags = RTF_UP,
1747                 .fc_nlinfo.nl_net = dev_net(dev),
1748         };
1749
1750         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1751
1752         ip6_route_add(&cfg);
1753 }
1754
1755 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1756 static void sit_route_add(struct net_device *dev)
1757 {
1758         struct fib6_config cfg = {
1759                 .fc_table = RT6_TABLE_MAIN,
1760                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1761                 .fc_ifindex = dev->ifindex,
1762                 .fc_dst_len = 96,
1763                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1764                 .fc_nlinfo.nl_net = dev_net(dev),
1765         };
1766
1767         /* prefix length - 96 bits "::d.d.d.d" */
1768         ip6_route_add(&cfg);
1769 }
1770 #endif
1771
1772 static void addrconf_add_lroute(struct net_device *dev)
1773 {
1774         struct in6_addr addr;
1775
1776         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1777         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1778 }
1779
1780 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1781 {
1782         struct inet6_dev *idev;
1783
1784         ASSERT_RTNL();
1785
1786         idev = ipv6_find_idev(dev);
1787         if (!idev)
1788                 return ERR_PTR(-ENOBUFS);
1789
1790         if (idev->cnf.disable_ipv6)
1791                 return ERR_PTR(-EACCES);
1792
1793         /* Add default multicast route */
1794         if (!(dev->flags & IFF_LOOPBACK))
1795                 addrconf_add_mroute(dev);
1796
1797         /* Add link local route */
1798         addrconf_add_lroute(dev);
1799         return idev;
1800 }
1801
1802 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1803 {
1804         struct prefix_info *pinfo;
1805         __u32 valid_lft;
1806         __u32 prefered_lft;
1807         int addr_type;
1808         struct inet6_dev *in6_dev;
1809         struct net *net = dev_net(dev);
1810
1811         pinfo = (struct prefix_info *) opt;
1812
1813         if (len < sizeof(struct prefix_info)) {
1814                 ADBG(("addrconf: prefix option too short\n"));
1815                 return;
1816         }
1817
1818         /*
1819          *      Validation checks ([ADDRCONF], page 19)
1820          */
1821
1822         addr_type = ipv6_addr_type(&pinfo->prefix);
1823
1824         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1825                 return;
1826
1827         valid_lft = ntohl(pinfo->valid);
1828         prefered_lft = ntohl(pinfo->prefered);
1829
1830         if (prefered_lft > valid_lft) {
1831                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1832                 return;
1833         }
1834
1835         in6_dev = in6_dev_get(dev);
1836
1837         if (in6_dev == NULL) {
1838                 net_dbg_ratelimited("addrconf: device %s not configured\n",
1839                                     dev->name);
1840                 return;
1841         }
1842
1843         /*
1844          *      Two things going on here:
1845          *      1) Add routes for on-link prefixes
1846          *      2) Configure prefixes with the auto flag set
1847          */
1848
1849         if (pinfo->onlink) {
1850                 struct rt6_info *rt;
1851                 unsigned long rt_expires;
1852
1853                 /* Avoid arithmetic overflow. Really, we could
1854                  * save rt_expires in seconds, likely valid_lft,
1855                  * but it would require division in fib gc, that it
1856                  * not good.
1857                  */
1858                 if (HZ > USER_HZ)
1859                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1860                 else
1861                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1862
1863                 if (addrconf_finite_timeout(rt_expires))
1864                         rt_expires *= HZ;
1865
1866                 rt = addrconf_get_prefix_route(&pinfo->prefix,
1867                                                pinfo->prefix_len,
1868                                                dev,
1869                                                RTF_ADDRCONF | RTF_PREFIX_RT,
1870                                                RTF_GATEWAY | RTF_DEFAULT);
1871
1872                 if (rt) {
1873                         /* Autoconf prefix route */
1874                         if (valid_lft == 0) {
1875                                 ip6_del_rt(rt);
1876                                 rt = NULL;
1877                         } else if (addrconf_finite_timeout(rt_expires)) {
1878                                 /* not infinity */
1879                                 rt6_set_expires(rt, jiffies + rt_expires);
1880                         } else {
1881                                 rt6_clean_expires(rt);
1882                         }
1883                 } else if (valid_lft) {
1884                         clock_t expires = 0;
1885                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1886                         if (addrconf_finite_timeout(rt_expires)) {
1887                                 /* not infinity */
1888                                 flags |= RTF_EXPIRES;
1889                                 expires = jiffies_to_clock_t(rt_expires);
1890                         }
1891                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1892                                               dev, expires, flags);
1893                 }
1894                 if (rt)
1895                         dst_release(&rt->dst);
1896         }
1897
1898         /* Try to figure out our local address for this prefix */
1899
1900         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1901                 struct inet6_ifaddr *ifp;
1902                 struct in6_addr addr;
1903                 int create = 0, update_lft = 0;
1904
1905                 if (pinfo->prefix_len == 64) {
1906                         memcpy(&addr, &pinfo->prefix, 8);
1907                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1908                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1909                                 in6_dev_put(in6_dev);
1910                                 return;
1911                         }
1912                         goto ok;
1913                 }
1914                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1915                                     pinfo->prefix_len);
1916                 in6_dev_put(in6_dev);
1917                 return;
1918
1919 ok:
1920
1921                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1922
1923                 if (ifp == NULL && valid_lft) {
1924                         int max_addresses = in6_dev->cnf.max_addresses;
1925                         u32 addr_flags = 0;
1926
1927 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1928                         if (in6_dev->cnf.optimistic_dad &&
1929                             !net->ipv6.devconf_all->forwarding && sllao)
1930                                 addr_flags = IFA_F_OPTIMISTIC;
1931 #endif
1932
1933                         /* Do not allow to create too much of autoconfigured
1934                          * addresses; this would be too easy way to crash kernel.
1935                          */
1936                         if (!max_addresses ||
1937                             ipv6_count_addresses(in6_dev) < max_addresses)
1938                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1939                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1940                                                     addr_flags);
1941
1942                         if (!ifp || IS_ERR(ifp)) {
1943                                 in6_dev_put(in6_dev);
1944                                 return;
1945                         }
1946
1947                         update_lft = create = 1;
1948                         ifp->cstamp = jiffies;
1949                         addrconf_dad_start(ifp);
1950                 }
1951
1952                 if (ifp) {
1953                         int flags;
1954                         unsigned long now;
1955 #ifdef CONFIG_IPV6_PRIVACY
1956                         struct inet6_ifaddr *ift;
1957 #endif
1958                         u32 stored_lft;
1959
1960                         /* update lifetime (RFC2462 5.5.3 e) */
1961                         spin_lock(&ifp->lock);
1962                         now = jiffies;
1963                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1964                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1965                         else
1966                                 stored_lft = 0;
1967                         if (!update_lft && stored_lft) {
1968                                 if (valid_lft > MIN_VALID_LIFETIME ||
1969                                     valid_lft > stored_lft)
1970                                         update_lft = 1;
1971                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1972                                         /* valid_lft <= stored_lft is always true */
1973                                         /*
1974                                          * RFC 4862 Section 5.5.3e:
1975                                          * "Note that the preferred lifetime of
1976                                          *  the corresponding address is always
1977                                          *  reset to the Preferred Lifetime in
1978                                          *  the received Prefix Information
1979                                          *  option, regardless of whether the
1980                                          *  valid lifetime is also reset or
1981                                          *  ignored."
1982                                          *
1983                                          *  So if the preferred lifetime in
1984                                          *  this advertisement is different
1985                                          *  than what we have stored, but the
1986                                          *  valid lifetime is invalid, just
1987                                          *  reset prefered_lft.
1988                                          *
1989                                          *  We must set the valid lifetime
1990                                          *  to the stored lifetime since we'll
1991                                          *  be updating the timestamp below,
1992                                          *  else we'll set it back to the
1993                                          *  minimum.
1994                                          */
1995                                         if (prefered_lft != ifp->prefered_lft) {
1996                                                 valid_lft = stored_lft;
1997                                                 update_lft = 1;
1998                                         }
1999                                 } else {
2000                                         valid_lft = MIN_VALID_LIFETIME;
2001                                         if (valid_lft < prefered_lft)
2002                                                 prefered_lft = valid_lft;
2003                                         update_lft = 1;
2004                                 }
2005                         }
2006
2007                         if (update_lft) {
2008                                 ifp->valid_lft = valid_lft;
2009                                 ifp->prefered_lft = prefered_lft;
2010                                 ifp->tstamp = now;
2011                                 flags = ifp->flags;
2012                                 ifp->flags &= ~IFA_F_DEPRECATED;
2013                                 spin_unlock(&ifp->lock);
2014
2015                                 if (!(flags&IFA_F_TENTATIVE))
2016                                         ipv6_ifa_notify(0, ifp);
2017                         } else
2018                                 spin_unlock(&ifp->lock);
2019
2020 #ifdef CONFIG_IPV6_PRIVACY
2021                         read_lock_bh(&in6_dev->lock);
2022                         /* update all temporary addresses in the list */
2023                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2024                                             tmp_list) {
2025                                 int age, max_valid, max_prefered;
2026
2027                                 if (ifp != ift->ifpub)
2028                                         continue;
2029
2030                                 /*
2031                                  * RFC 4941 section 3.3:
2032                                  * If a received option will extend the lifetime
2033                                  * of a public address, the lifetimes of
2034                                  * temporary addresses should be extended,
2035                                  * subject to the overall constraint that no
2036                                  * temporary addresses should ever remain
2037                                  * "valid" or "preferred" for a time longer than
2038                                  * (TEMP_VALID_LIFETIME) or
2039                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2040                                  * respectively.
2041                                  */
2042                                 age = (now - ift->cstamp) / HZ;
2043                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2044                                 if (max_valid < 0)
2045                                         max_valid = 0;
2046
2047                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2048                                                in6_dev->cnf.max_desync_factor -
2049                                                age;
2050                                 if (max_prefered < 0)
2051                                         max_prefered = 0;
2052
2053                                 if (valid_lft > max_valid)
2054                                         valid_lft = max_valid;
2055
2056                                 if (prefered_lft > max_prefered)
2057                                         prefered_lft = max_prefered;
2058
2059                                 spin_lock(&ift->lock);
2060                                 flags = ift->flags;
2061                                 ift->valid_lft = valid_lft;
2062                                 ift->prefered_lft = prefered_lft;
2063                                 ift->tstamp = now;
2064                                 if (prefered_lft > 0)
2065                                         ift->flags &= ~IFA_F_DEPRECATED;
2066
2067                                 spin_unlock(&ift->lock);
2068                                 if (!(flags&IFA_F_TENTATIVE))
2069                                         ipv6_ifa_notify(0, ift);
2070                         }
2071
2072                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2073                                 /*
2074                                  * When a new public address is created as
2075                                  * described in [ADDRCONF], also create a new
2076                                  * temporary address. Also create a temporary
2077                                  * address if it's enabled but no temporary
2078                                  * address currently exists.
2079                                  */
2080                                 read_unlock_bh(&in6_dev->lock);
2081                                 ipv6_create_tempaddr(ifp, NULL);
2082                         } else {
2083                                 read_unlock_bh(&in6_dev->lock);
2084                         }
2085 #endif
2086                         in6_ifa_put(ifp);
2087                         addrconf_verify(0);
2088                 }
2089         }
2090         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2091         in6_dev_put(in6_dev);
2092 }
2093
2094 /*
2095  *      Set destination address.
2096  *      Special case for SIT interfaces where we create a new "virtual"
2097  *      device.
2098  */
2099 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2100 {
2101         struct in6_ifreq ireq;
2102         struct net_device *dev;
2103         int err = -EINVAL;
2104
2105         rtnl_lock();
2106
2107         err = -EFAULT;
2108         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2109                 goto err_exit;
2110
2111         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2112
2113         err = -ENODEV;
2114         if (dev == NULL)
2115                 goto err_exit;
2116
2117 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2118         if (dev->type == ARPHRD_SIT) {
2119                 const struct net_device_ops *ops = dev->netdev_ops;
2120                 struct ifreq ifr;
2121                 struct ip_tunnel_parm p;
2122
2123                 err = -EADDRNOTAVAIL;
2124                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2125                         goto err_exit;
2126
2127                 memset(&p, 0, sizeof(p));
2128                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2129                 p.iph.saddr = 0;
2130                 p.iph.version = 4;
2131                 p.iph.ihl = 5;
2132                 p.iph.protocol = IPPROTO_IPV6;
2133                 p.iph.ttl = 64;
2134                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2135
2136                 if (ops->ndo_do_ioctl) {
2137                         mm_segment_t oldfs = get_fs();
2138
2139                         set_fs(KERNEL_DS);
2140                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2141                         set_fs(oldfs);
2142                 } else
2143                         err = -EOPNOTSUPP;
2144
2145                 if (err == 0) {
2146                         err = -ENOBUFS;
2147                         dev = __dev_get_by_name(net, p.name);
2148                         if (!dev)
2149                                 goto err_exit;
2150                         err = dev_open(dev);
2151                 }
2152         }
2153 #endif
2154
2155 err_exit:
2156         rtnl_unlock();
2157         return err;
2158 }
2159
2160 /*
2161  *      Manual configuration of address on an interface
2162  */
2163 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2164                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2165                           __u32 valid_lft)
2166 {
2167         struct inet6_ifaddr *ifp;
2168         struct inet6_dev *idev;
2169         struct net_device *dev;
2170         int scope;
2171         u32 flags;
2172         clock_t expires;
2173         unsigned long timeout;
2174
2175         ASSERT_RTNL();
2176
2177         if (plen > 128)
2178                 return -EINVAL;
2179
2180         /* check the lifetime */
2181         if (!valid_lft || prefered_lft > valid_lft)
2182                 return -EINVAL;
2183
2184         dev = __dev_get_by_index(net, ifindex);
2185         if (!dev)
2186                 return -ENODEV;
2187
2188         idev = addrconf_add_dev(dev);
2189         if (IS_ERR(idev))
2190                 return PTR_ERR(idev);
2191
2192         scope = ipv6_addr_scope(pfx);
2193
2194         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2195         if (addrconf_finite_timeout(timeout)) {
2196                 expires = jiffies_to_clock_t(timeout * HZ);
2197                 valid_lft = timeout;
2198                 flags = RTF_EXPIRES;
2199         } else {
2200                 expires = 0;
2201                 flags = 0;
2202                 ifa_flags |= IFA_F_PERMANENT;
2203         }
2204
2205         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2206         if (addrconf_finite_timeout(timeout)) {
2207                 if (timeout == 0)
2208                         ifa_flags |= IFA_F_DEPRECATED;
2209                 prefered_lft = timeout;
2210         }
2211
2212         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2213
2214         if (!IS_ERR(ifp)) {
2215                 spin_lock_bh(&ifp->lock);
2216                 ifp->valid_lft = valid_lft;
2217                 ifp->prefered_lft = prefered_lft;
2218                 ifp->tstamp = jiffies;
2219                 spin_unlock_bh(&ifp->lock);
2220
2221                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2222                                       expires, flags);
2223                 /*
2224                  * Note that section 3.1 of RFC 4429 indicates
2225                  * that the Optimistic flag should not be set for
2226                  * manually configured addresses
2227                  */
2228                 addrconf_dad_start(ifp);
2229                 in6_ifa_put(ifp);
2230                 addrconf_verify(0);
2231                 return 0;
2232         }
2233
2234         return PTR_ERR(ifp);
2235 }
2236
2237 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2238                           unsigned int plen)
2239 {
2240         struct inet6_ifaddr *ifp;
2241         struct inet6_dev *idev;
2242         struct net_device *dev;
2243
2244         if (plen > 128)
2245                 return -EINVAL;
2246
2247         dev = __dev_get_by_index(net, ifindex);
2248         if (!dev)
2249                 return -ENODEV;
2250
2251         if ((idev = __in6_dev_get(dev)) == NULL)
2252                 return -ENXIO;
2253
2254         read_lock_bh(&idev->lock);
2255         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2256                 if (ifp->prefix_len == plen &&
2257                     ipv6_addr_equal(pfx, &ifp->addr)) {
2258                         in6_ifa_hold(ifp);
2259                         read_unlock_bh(&idev->lock);
2260
2261                         ipv6_del_addr(ifp);
2262
2263                         /* If the last address is deleted administratively,
2264                            disable IPv6 on this interface.
2265                          */
2266                         if (list_empty(&idev->addr_list))
2267                                 addrconf_ifdown(idev->dev, 1);
2268                         return 0;
2269                 }
2270         }
2271         read_unlock_bh(&idev->lock);
2272         return -EADDRNOTAVAIL;
2273 }
2274
2275
2276 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2277 {
2278         struct in6_ifreq ireq;
2279         int err;
2280
2281         if (!capable(CAP_NET_ADMIN))
2282                 return -EPERM;
2283
2284         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2285                 return -EFAULT;
2286
2287         rtnl_lock();
2288         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2289                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2290                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2291         rtnl_unlock();
2292         return err;
2293 }
2294
2295 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2296 {
2297         struct in6_ifreq ireq;
2298         int err;
2299
2300         if (!capable(CAP_NET_ADMIN))
2301                 return -EPERM;
2302
2303         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2304                 return -EFAULT;
2305
2306         rtnl_lock();
2307         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2308                              ireq.ifr6_prefixlen);
2309         rtnl_unlock();
2310         return err;
2311 }
2312
2313 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2314                      int plen, int scope)
2315 {
2316         struct inet6_ifaddr *ifp;
2317
2318         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2319         if (!IS_ERR(ifp)) {
2320                 spin_lock_bh(&ifp->lock);
2321                 ifp->flags &= ~IFA_F_TENTATIVE;
2322                 spin_unlock_bh(&ifp->lock);
2323                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2324                 in6_ifa_put(ifp);
2325         }
2326 }
2327
2328 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2329 static void sit_add_v4_addrs(struct inet6_dev *idev)
2330 {
2331         struct in6_addr addr;
2332         struct net_device *dev;
2333         struct net *net = dev_net(idev->dev);
2334         int scope;
2335
2336         ASSERT_RTNL();
2337
2338         memset(&addr, 0, sizeof(struct in6_addr));
2339         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2340
2341         if (idev->dev->flags&IFF_POINTOPOINT) {
2342                 addr.s6_addr32[0] = htonl(0xfe800000);
2343                 scope = IFA_LINK;
2344         } else {
2345                 scope = IPV6_ADDR_COMPATv4;
2346         }
2347
2348         if (addr.s6_addr32[3]) {
2349                 add_addr(idev, &addr, 128, scope);
2350                 return;
2351         }
2352
2353         for_each_netdev(net, dev) {
2354                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2355                 if (in_dev && (dev->flags & IFF_UP)) {
2356                         struct in_ifaddr *ifa;
2357
2358                         int flag = scope;
2359
2360                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2361                                 int plen;
2362
2363                                 addr.s6_addr32[3] = ifa->ifa_local;
2364
2365                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2366                                         continue;
2367                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2368                                         if (idev->dev->flags&IFF_POINTOPOINT)
2369                                                 continue;
2370                                         flag |= IFA_HOST;
2371                                 }
2372                                 if (idev->dev->flags&IFF_POINTOPOINT)
2373                                         plen = 64;
2374                                 else
2375                                         plen = 96;
2376
2377                                 add_addr(idev, &addr, plen, flag);
2378                         }
2379                 }
2380         }
2381 }
2382 #endif
2383
2384 static void init_loopback(struct net_device *dev)
2385 {
2386         struct inet6_dev  *idev;
2387
2388         /* ::1 */
2389
2390         ASSERT_RTNL();
2391
2392         if ((idev = ipv6_find_idev(dev)) == NULL) {
2393                 pr_debug("%s: add_dev failed\n", __func__);
2394                 return;
2395         }
2396
2397         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2398 }
2399
2400 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2401 {
2402         struct inet6_ifaddr *ifp;
2403         u32 addr_flags = IFA_F_PERMANENT;
2404
2405 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2406         if (idev->cnf.optimistic_dad &&
2407             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2408                 addr_flags |= IFA_F_OPTIMISTIC;
2409 #endif
2410
2411
2412         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2413         if (!IS_ERR(ifp)) {
2414                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2415                 addrconf_dad_start(ifp);
2416                 in6_ifa_put(ifp);
2417         }
2418 }
2419
2420 static void addrconf_dev_config(struct net_device *dev)
2421 {
2422         struct in6_addr addr;
2423         struct inet6_dev *idev;
2424
2425         ASSERT_RTNL();
2426
2427         if ((dev->type != ARPHRD_ETHER) &&
2428             (dev->type != ARPHRD_FDDI) &&
2429             (dev->type != ARPHRD_ARCNET) &&
2430             (dev->type != ARPHRD_INFINIBAND) &&
2431             (dev->type != ARPHRD_IEEE802154)) {
2432                 /* Alas, we support only Ethernet autoconfiguration. */
2433                 return;
2434         }
2435
2436         idev = addrconf_add_dev(dev);
2437         if (IS_ERR(idev))
2438                 return;
2439
2440         memset(&addr, 0, sizeof(struct in6_addr));
2441         addr.s6_addr32[0] = htonl(0xFE800000);
2442
2443         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2444                 addrconf_add_linklocal(idev, &addr);
2445 }
2446
2447 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2448 static void addrconf_sit_config(struct net_device *dev)
2449 {
2450         struct inet6_dev *idev;
2451
2452         ASSERT_RTNL();
2453
2454         /*
2455          * Configure the tunnel with one of our IPv4
2456          * addresses... we should configure all of
2457          * our v4 addrs in the tunnel
2458          */
2459
2460         if ((idev = ipv6_find_idev(dev)) == NULL) {
2461                 pr_debug("%s: add_dev failed\n", __func__);
2462                 return;
2463         }
2464
2465         if (dev->priv_flags & IFF_ISATAP) {
2466                 struct in6_addr addr;
2467
2468                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2469                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2470                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2471                         addrconf_add_linklocal(idev, &addr);
2472                 return;
2473         }
2474
2475         sit_add_v4_addrs(idev);
2476
2477         if (dev->flags&IFF_POINTOPOINT) {
2478                 addrconf_add_mroute(dev);
2479                 addrconf_add_lroute(dev);
2480         } else
2481                 sit_route_add(dev);
2482 }
2483 #endif
2484
2485 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2486 static void addrconf_gre_config(struct net_device *dev)
2487 {
2488         struct inet6_dev *idev;
2489         struct in6_addr addr;
2490
2491         pr_info("%s(%s)\n", __func__, dev->name);
2492
2493         ASSERT_RTNL();
2494
2495         if ((idev = ipv6_find_idev(dev)) == NULL) {
2496                 pr_debug("%s: add_dev failed\n", __func__);
2497                 return;
2498         }
2499
2500         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2501         addrconf_prefix_route(&addr, 64, dev, 0, 0);
2502
2503         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2504                 addrconf_add_linklocal(idev, &addr);
2505 }
2506 #endif
2507
2508 static inline int
2509 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2510 {
2511         struct in6_addr lladdr;
2512
2513         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2514                 addrconf_add_linklocal(idev, &lladdr);
2515                 return 0;
2516         }
2517         return -1;
2518 }
2519
2520 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2521 {
2522         struct net_device *link_dev;
2523         struct net *net = dev_net(idev->dev);
2524
2525         /* first try to inherit the link-local address from the link device */
2526         if (idev->dev->iflink &&
2527             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2528                 if (!ipv6_inherit_linklocal(idev, link_dev))
2529                         return;
2530         }
2531         /* then try to inherit it from any device */
2532         for_each_netdev(net, link_dev) {
2533                 if (!ipv6_inherit_linklocal(idev, link_dev))
2534                         return;
2535         }
2536         pr_debug("init ip6-ip6: add_linklocal failed\n");
2537 }
2538
2539 /*
2540  * Autoconfigure tunnel with a link-local address so routing protocols,
2541  * DHCPv6, MLD etc. can be run over the virtual link
2542  */
2543
2544 static void addrconf_ip6_tnl_config(struct net_device *dev)
2545 {
2546         struct inet6_dev *idev;
2547
2548         ASSERT_RTNL();
2549
2550         idev = addrconf_add_dev(dev);
2551         if (IS_ERR(idev)) {
2552                 pr_debug("init ip6-ip6: add_dev failed\n");
2553                 return;
2554         }
2555         ip6_tnl_add_linklocal(idev);
2556 }
2557
2558 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2559                            void *data)
2560 {
2561         struct net_device *dev = (struct net_device *) data;
2562         struct inet6_dev *idev = __in6_dev_get(dev);
2563         int run_pending = 0;
2564         int err;
2565
2566         switch (event) {
2567         case NETDEV_REGISTER:
2568                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2569                         idev = ipv6_add_dev(dev);
2570                         if (!idev)
2571                                 return notifier_from_errno(-ENOMEM);
2572                 }
2573                 break;
2574
2575         case NETDEV_UP:
2576         case NETDEV_CHANGE:
2577                 if (dev->flags & IFF_SLAVE)
2578                         break;
2579
2580                 if (event == NETDEV_UP) {
2581                         if (!addrconf_qdisc_ok(dev)) {
2582                                 /* device is not ready yet. */
2583                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2584                                         dev->name);
2585                                 break;
2586                         }
2587
2588                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2589                                 idev = ipv6_add_dev(dev);
2590
2591                         if (idev) {
2592                                 idev->if_flags |= IF_READY;
2593                                 run_pending = 1;
2594                         }
2595                 } else {
2596                         if (!addrconf_qdisc_ok(dev)) {
2597                                 /* device is still not ready. */
2598                                 break;
2599                         }
2600
2601                         if (idev) {
2602                                 if (idev->if_flags & IF_READY)
2603                                         /* device is already configured. */
2604                                         break;
2605                                 idev->if_flags |= IF_READY;
2606                         }
2607
2608                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2609                                 dev->name);
2610
2611                         run_pending = 1;
2612                 }
2613
2614                 switch (dev->type) {
2615 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2616                 case ARPHRD_SIT:
2617                         addrconf_sit_config(dev);
2618                         break;
2619 #endif
2620 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2621                 case ARPHRD_IPGRE:
2622                         addrconf_gre_config(dev);
2623                         break;
2624 #endif
2625                 case ARPHRD_TUNNEL6:
2626                         addrconf_ip6_tnl_config(dev);
2627                         break;
2628                 case ARPHRD_LOOPBACK:
2629                         init_loopback(dev);
2630                         break;
2631
2632                 default:
2633                         addrconf_dev_config(dev);
2634                         break;
2635                 }
2636
2637                 if (idev) {
2638                         if (run_pending)
2639                                 addrconf_dad_run(idev);
2640
2641                         /*
2642                          * If the MTU changed during the interface down,
2643                          * when the interface up, the changed MTU must be
2644                          * reflected in the idev as well as routers.
2645                          */
2646                         if (idev->cnf.mtu6 != dev->mtu &&
2647                             dev->mtu >= IPV6_MIN_MTU) {
2648                                 rt6_mtu_change(dev, dev->mtu);
2649                                 idev->cnf.mtu6 = dev->mtu;
2650                         }
2651                         idev->tstamp = jiffies;
2652                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2653
2654                         /*
2655                          * If the changed mtu during down is lower than
2656                          * IPV6_MIN_MTU stop IPv6 on this interface.
2657                          */
2658                         if (dev->mtu < IPV6_MIN_MTU)
2659                                 addrconf_ifdown(dev, 1);
2660                 }
2661                 break;
2662
2663         case NETDEV_CHANGEMTU:
2664                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2665                         rt6_mtu_change(dev, dev->mtu);
2666                         idev->cnf.mtu6 = dev->mtu;
2667                         break;
2668                 }
2669
2670                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2671                         idev = ipv6_add_dev(dev);
2672                         if (idev)
2673                                 break;
2674                 }
2675
2676                 /*
2677                  * MTU falled under IPV6_MIN_MTU.
2678                  * Stop IPv6 on this interface.
2679                  */
2680
2681         case NETDEV_DOWN:
2682         case NETDEV_UNREGISTER:
2683                 /*
2684                  *      Remove all addresses from this interface.
2685                  */
2686                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2687                 break;
2688
2689         case NETDEV_CHANGENAME:
2690                 if (idev) {
2691                         snmp6_unregister_dev(idev);
2692                         addrconf_sysctl_unregister(idev);
2693                         addrconf_sysctl_register(idev);
2694                         err = snmp6_register_dev(idev);
2695                         if (err)
2696                                 return notifier_from_errno(err);
2697                 }
2698                 break;
2699
2700         case NETDEV_PRE_TYPE_CHANGE:
2701         case NETDEV_POST_TYPE_CHANGE:
2702                 addrconf_type_change(dev, event);
2703                 break;
2704         }
2705
2706         return NOTIFY_OK;
2707 }
2708
2709 /*
2710  *      addrconf module should be notified of a device going up
2711  */
2712 static struct notifier_block ipv6_dev_notf = {
2713         .notifier_call = addrconf_notify,
2714 };
2715
2716 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2717 {
2718         struct inet6_dev *idev;
2719         ASSERT_RTNL();
2720
2721         idev = __in6_dev_get(dev);
2722
2723         if (event == NETDEV_POST_TYPE_CHANGE)
2724                 ipv6_mc_remap(idev);
2725         else if (event == NETDEV_PRE_TYPE_CHANGE)
2726                 ipv6_mc_unmap(idev);
2727 }
2728
2729 static int addrconf_ifdown(struct net_device *dev, int how)
2730 {
2731         struct net *net = dev_net(dev);
2732         struct inet6_dev *idev;
2733         struct inet6_ifaddr *ifa;
2734         int state, i;
2735
2736         ASSERT_RTNL();
2737
2738         rt6_ifdown(net, dev);
2739         neigh_ifdown(&nd_tbl, dev);
2740
2741         idev = __in6_dev_get(dev);
2742         if (idev == NULL)
2743                 return -ENODEV;
2744
2745         /*
2746          * Step 1: remove reference to ipv6 device from parent device.
2747          *         Do not dev_put!
2748          */
2749         if (how) {
2750                 idev->dead = 1;
2751
2752                 /* protected by rtnl_lock */
2753                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2754
2755                 /* Step 1.5: remove snmp6 entry */
2756                 snmp6_unregister_dev(idev);
2757
2758         }
2759
2760         /* Step 2: clear hash table */
2761         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2762                 struct hlist_head *h = &inet6_addr_lst[i];
2763                 struct hlist_node *n;
2764
2765                 spin_lock_bh(&addrconf_hash_lock);
2766         restart:
2767                 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2768                         if (ifa->idev == idev) {
2769                                 hlist_del_init_rcu(&ifa->addr_lst);
2770                                 addrconf_del_timer(ifa);
2771                                 goto restart;
2772                         }
2773                 }
2774                 spin_unlock_bh(&addrconf_hash_lock);
2775         }
2776
2777         write_lock_bh(&idev->lock);
2778
2779         /* Step 2: clear flags for stateless addrconf */
2780         if (!how)
2781                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2782
2783 #ifdef CONFIG_IPV6_PRIVACY
2784         if (how && del_timer(&idev->regen_timer))
2785                 in6_dev_put(idev);
2786
2787         /* Step 3: clear tempaddr list */
2788         while (!list_empty(&idev->tempaddr_list)) {
2789                 ifa = list_first_entry(&idev->tempaddr_list,
2790                                        struct inet6_ifaddr, tmp_list);
2791                 list_del(&ifa->tmp_list);
2792                 write_unlock_bh(&idev->lock);
2793                 spin_lock_bh(&ifa->lock);
2794
2795                 if (ifa->ifpub) {
2796                         in6_ifa_put(ifa->ifpub);
2797                         ifa->ifpub = NULL;
2798                 }
2799                 spin_unlock_bh(&ifa->lock);
2800                 in6_ifa_put(ifa);
2801                 write_lock_bh(&idev->lock);
2802         }
2803 #endif
2804
2805         while (!list_empty(&idev->addr_list)) {
2806                 ifa = list_first_entry(&idev->addr_list,
2807                                        struct inet6_ifaddr, if_list);
2808                 addrconf_del_timer(ifa);
2809
2810                 list_del(&ifa->if_list);
2811
2812                 write_unlock_bh(&idev->lock);
2813
2814                 spin_lock_bh(&ifa->state_lock);
2815                 state = ifa->state;
2816                 ifa->state = INET6_IFADDR_STATE_DEAD;
2817                 spin_unlock_bh(&ifa->state_lock);
2818
2819                 if (state != INET6_IFADDR_STATE_DEAD) {
2820                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
2821                         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2822                 }
2823                 in6_ifa_put(ifa);
2824
2825                 write_lock_bh(&idev->lock);
2826         }
2827
2828         write_unlock_bh(&idev->lock);
2829
2830         /* Step 5: Discard multicast list */
2831         if (how)
2832                 ipv6_mc_destroy_dev(idev);
2833         else
2834                 ipv6_mc_down(idev);
2835
2836         idev->tstamp = jiffies;
2837
2838         /* Last: Shot the device (if unregistered) */
2839         if (how) {
2840                 addrconf_sysctl_unregister(idev);
2841                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2842                 neigh_ifdown(&nd_tbl, dev);
2843                 in6_dev_put(idev);
2844         }
2845         return 0;
2846 }
2847
2848 static void addrconf_rs_timer(unsigned long data)
2849 {
2850         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2851         struct inet6_dev *idev = ifp->idev;
2852
2853         read_lock(&idev->lock);
2854         if (idev->dead || !(idev->if_flags & IF_READY))
2855                 goto out;
2856
2857         if (idev->cnf.forwarding)
2858                 goto out;
2859
2860         /* Announcement received after solicitation was sent */
2861         if (idev->if_flags & IF_RA_RCVD)
2862                 goto out;
2863
2864         spin_lock(&ifp->lock);
2865         if (ifp->probes++ < idev->cnf.rtr_solicits) {
2866                 /* The wait after the last probe can be shorter */
2867                 addrconf_mod_timer(ifp, AC_RS,
2868                                    (ifp->probes == idev->cnf.rtr_solicits) ?
2869                                    idev->cnf.rtr_solicit_delay :
2870                                    idev->cnf.rtr_solicit_interval);
2871                 spin_unlock(&ifp->lock);
2872
2873                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2874         } else {
2875                 spin_unlock(&ifp->lock);
2876                 /*
2877                  * Note: we do not support deprecated "all on-link"
2878                  * assumption any longer.
2879                  */
2880                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
2881         }
2882
2883 out:
2884         read_unlock(&idev->lock);
2885         in6_ifa_put(ifp);
2886 }
2887
2888 /*
2889  *      Duplicate Address Detection
2890  */
2891 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2892 {
2893         unsigned long rand_num;
2894         struct inet6_dev *idev = ifp->idev;
2895
2896         if (ifp->flags & IFA_F_OPTIMISTIC)
2897                 rand_num = 0;
2898         else
2899                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2900
2901         ifp->probes = idev->cnf.dad_transmits;
2902         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2903 }
2904
2905 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
2906 {
2907         struct inet6_dev *idev = ifp->idev;
2908         struct net_device *dev = idev->dev;
2909
2910         addrconf_join_solict(dev, &ifp->addr);
2911
2912         net_srandom(ifp->addr.s6_addr32[3]);
2913
2914         read_lock_bh(&idev->lock);
2915         spin_lock(&ifp->lock);
2916         if (ifp->state == INET6_IFADDR_STATE_DEAD)
2917                 goto out;
2918
2919         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2920             idev->cnf.accept_dad < 1 ||
2921             !(ifp->flags&IFA_F_TENTATIVE) ||
2922             ifp->flags & IFA_F_NODAD) {
2923                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2924                 spin_unlock(&ifp->lock);
2925                 read_unlock_bh(&idev->lock);
2926
2927                 addrconf_dad_completed(ifp);
2928                 return;
2929         }
2930
2931         if (!(idev->if_flags & IF_READY)) {
2932                 spin_unlock(&ifp->lock);
2933                 read_unlock_bh(&idev->lock);
2934                 /*
2935                  * If the device is not ready:
2936                  * - keep it tentative if it is a permanent address.
2937                  * - otherwise, kill it.
2938                  */
2939                 in6_ifa_hold(ifp);
2940                 addrconf_dad_stop(ifp, 0);
2941                 return;
2942         }
2943
2944         /*
2945          * Optimistic nodes can start receiving
2946          * Frames right away
2947          */
2948         if (ifp->flags & IFA_F_OPTIMISTIC)
2949                 ip6_ins_rt(ifp->rt);
2950
2951         addrconf_dad_kick(ifp);
2952 out:
2953         spin_unlock(&ifp->lock);
2954         read_unlock_bh(&idev->lock);
2955 }
2956
2957 static void addrconf_dad_timer(unsigned long data)
2958 {
2959         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2960         struct inet6_dev *idev = ifp->idev;
2961         struct in6_addr mcaddr;
2962
2963         if (!ifp->probes && addrconf_dad_end(ifp))
2964                 goto out;
2965
2966         read_lock(&idev->lock);
2967         if (idev->dead || !(idev->if_flags & IF_READY)) {
2968                 read_unlock(&idev->lock);
2969                 goto out;
2970         }
2971
2972         spin_lock(&ifp->lock);
2973         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2974                 spin_unlock(&ifp->lock);
2975                 read_unlock(&idev->lock);
2976                 goto out;
2977         }
2978
2979         if (ifp->probes == 0) {
2980                 /*
2981                  * DAD was successful
2982                  */
2983
2984                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2985                 spin_unlock(&ifp->lock);
2986                 read_unlock(&idev->lock);
2987
2988                 addrconf_dad_completed(ifp);
2989
2990                 goto out;
2991         }
2992
2993         ifp->probes--;
2994         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2995         spin_unlock(&ifp->lock);
2996         read_unlock(&idev->lock);
2997
2998         /* send a neighbour solicitation for our addr */
2999         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3000         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3001 out:
3002         in6_ifa_put(ifp);
3003 }
3004
3005 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3006 {
3007         struct net_device *dev = ifp->idev->dev;
3008
3009         /*
3010          *      Configure the address for reception. Now it is valid.
3011          */
3012
3013         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3014
3015         /* If added prefix is link local and we are prepared to process
3016            router advertisements, start sending router solicitations.
3017          */
3018
3019         if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3020              ifp->idev->cnf.accept_ra == 2) &&
3021             ifp->idev->cnf.rtr_solicits > 0 &&
3022             (dev->flags&IFF_LOOPBACK) == 0 &&
3023             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3024                 /*
3025                  *      If a host as already performed a random delay
3026                  *      [...] as part of DAD [...] there is no need
3027                  *      to delay again before sending the first RS
3028                  */
3029                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3030
3031                 spin_lock_bh(&ifp->lock);
3032                 ifp->probes = 1;
3033                 ifp->idev->if_flags |= IF_RS_SENT;
3034                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3035                 spin_unlock_bh(&ifp->lock);
3036         }
3037 }
3038
3039 static void addrconf_dad_run(struct inet6_dev *idev)
3040 {
3041         struct inet6_ifaddr *ifp;
3042
3043         read_lock_bh(&idev->lock);
3044         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3045                 spin_lock(&ifp->lock);
3046                 if (ifp->flags & IFA_F_TENTATIVE &&
3047                     ifp->state == INET6_IFADDR_STATE_DAD)
3048                         addrconf_dad_kick(ifp);
3049                 spin_unlock(&ifp->lock);
3050         }
3051         read_unlock_bh(&idev->lock);
3052 }
3053
3054 #ifdef CONFIG_PROC_FS
3055 struct if6_iter_state {
3056         struct seq_net_private p;
3057         int bucket;
3058         int offset;
3059 };
3060
3061 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3062 {
3063         struct inet6_ifaddr *ifa = NULL;
3064         struct if6_iter_state *state = seq->private;
3065         struct net *net = seq_file_net(seq);
3066         int p = 0;
3067
3068         /* initial bucket if pos is 0 */
3069         if (pos == 0) {
3070                 state->bucket = 0;
3071                 state->offset = 0;
3072         }
3073
3074         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3075                 struct hlist_node *n;
3076                 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3077                                          addr_lst) {
3078                         /* sync with offset */
3079                         if (p < state->offset) {
3080                                 p++;
3081                                 continue;
3082                         }
3083                         state->offset++;
3084                         if (net_eq(dev_net(ifa->idev->dev), net))
3085                                 return ifa;
3086                 }
3087
3088                 /* prepare for next bucket */
3089                 state->offset = 0;
3090                 p = 0;
3091         }
3092         return NULL;
3093 }
3094
3095 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3096                                          struct inet6_ifaddr *ifa)
3097 {
3098         struct if6_iter_state *state = seq->private;
3099         struct net *net = seq_file_net(seq);
3100         struct hlist_node *n = &ifa->addr_lst;
3101
3102         hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3103                 state->offset++;
3104                 if (net_eq(dev_net(ifa->idev->dev), net))
3105                         return ifa;
3106         }
3107
3108         while (++state->bucket < IN6_ADDR_HSIZE) {
3109                 state->offset = 0;
3110                 hlist_for_each_entry_rcu_bh(ifa, n,
3111                                      &inet6_addr_lst[state->bucket], addr_lst) {
3112                         state->offset++;
3113                         if (net_eq(dev_net(ifa->idev->dev), net))
3114                                 return ifa;
3115                 }
3116         }
3117
3118         return NULL;
3119 }
3120
3121 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3122         __acquires(rcu_bh)
3123 {
3124         rcu_read_lock_bh();
3125         return if6_get_first(seq, *pos);
3126 }
3127
3128 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3129 {
3130         struct inet6_ifaddr *ifa;
3131
3132         ifa = if6_get_next(seq, v);
3133         ++*pos;
3134         return ifa;
3135 }
3136
3137 static void if6_seq_stop(struct seq_file *seq, void *v)
3138         __releases(rcu_bh)
3139 {
3140         rcu_read_unlock_bh();
3141 }
3142
3143 static int if6_seq_show(struct seq_file *seq, void *v)
3144 {
3145         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3146         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3147                    &ifp->addr,
3148                    ifp->idev->dev->ifindex,
3149                    ifp->prefix_len,
3150                    ifp->scope,
3151                    ifp->flags,
3152                    ifp->idev->dev->name);
3153         return 0;
3154 }
3155
3156 static const struct seq_operations if6_seq_ops = {
3157         .start  = if6_seq_start,
3158         .next   = if6_seq_next,
3159         .show   = if6_seq_show,
3160         .stop   = if6_seq_stop,
3161 };
3162
3163 static int if6_seq_open(struct inode *inode, struct file *file)
3164 {
3165         return seq_open_net(inode, file, &if6_seq_ops,
3166                             sizeof(struct if6_iter_state));
3167 }
3168
3169 static const struct file_operations if6_fops = {
3170         .owner          = THIS_MODULE,
3171         .open           = if6_seq_open,
3172         .read           = seq_read,
3173         .llseek         = seq_lseek,
3174         .release        = seq_release_net,
3175 };
3176
3177 static int __net_init if6_proc_net_init(struct net *net)
3178 {
3179         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3180                 return -ENOMEM;
3181         return 0;
3182 }
3183
3184 static void __net_exit if6_proc_net_exit(struct net *net)
3185 {
3186        proc_net_remove(net, "if_inet6");
3187 }
3188
3189 static struct pernet_operations if6_proc_net_ops = {
3190        .init = if6_proc_net_init,
3191        .exit = if6_proc_net_exit,
3192 };
3193
3194 int __init if6_proc_init(void)
3195 {
3196         return register_pernet_subsys(&if6_proc_net_ops);
3197 }
3198
3199 void if6_proc_exit(void)
3200 {
3201         unregister_pernet_subsys(&if6_proc_net_ops);
3202 }
3203 #endif  /* CONFIG_PROC_FS */
3204
3205 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3206 /* Check if address is a home address configured on any interface. */
3207 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3208 {
3209         int ret = 0;
3210         struct inet6_ifaddr *ifp = NULL;
3211         struct hlist_node *n;
3212         unsigned int hash = inet6_addr_hash(addr);
3213
3214         rcu_read_lock_bh();
3215         hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3216                 if (!net_eq(dev_net(ifp->idev->dev), net))
3217                         continue;
3218                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3219                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3220                         ret = 1;
3221                         break;
3222                 }
3223         }
3224         rcu_read_unlock_bh();
3225         return ret;
3226 }
3227 #endif
3228
3229 /*
3230  *      Periodic address status verification
3231  */
3232
3233 static void addrconf_verify(unsigned long foo)
3234 {
3235         unsigned long now, next, next_sec, next_sched;
3236         struct inet6_ifaddr *ifp;
3237         struct hlist_node *node;
3238         int i;
3239
3240         rcu_read_lock_bh();
3241         spin_lock(&addrconf_verify_lock);
3242         now = jiffies;
3243         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3244
3245         del_timer(&addr_chk_timer);
3246
3247         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3248 restart:
3249                 hlist_for_each_entry_rcu_bh(ifp, node,
3250                                          &inet6_addr_lst[i], addr_lst) {
3251                         unsigned long age;
3252
3253                         if (ifp->flags & IFA_F_PERMANENT)
3254                                 continue;
3255
3256                         spin_lock(&ifp->lock);
3257                         /* We try to batch several events at once. */
3258                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3259
3260                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3261                             age >= ifp->valid_lft) {
3262                                 spin_unlock(&ifp->lock);
3263                                 in6_ifa_hold(ifp);
3264                                 ipv6_del_addr(ifp);
3265                                 goto restart;
3266                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3267                                 spin_unlock(&ifp->lock);
3268                                 continue;
3269                         } else if (age >= ifp->prefered_lft) {
3270                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3271                                 int deprecate = 0;
3272
3273                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3274                                         deprecate = 1;
3275                                         ifp->flags |= IFA_F_DEPRECATED;
3276                                 }
3277
3278                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3279                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3280
3281                                 spin_unlock(&ifp->lock);
3282
3283                                 if (deprecate) {
3284                                         in6_ifa_hold(ifp);
3285
3286                                         ipv6_ifa_notify(0, ifp);
3287                                         in6_ifa_put(ifp);
3288                                         goto restart;
3289                                 }
3290 #ifdef CONFIG_IPV6_PRIVACY
3291                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3292                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3293                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3294                                         ifp->idev->cnf.dad_transmits *
3295                                         ifp->idev->nd_parms->retrans_time / HZ;
3296
3297                                 if (age >= ifp->prefered_lft - regen_advance) {
3298                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3299                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3300                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3301                                         if (!ifp->regen_count && ifpub) {
3302                                                 ifp->regen_count++;
3303                                                 in6_ifa_hold(ifp);
3304                                                 in6_ifa_hold(ifpub);
3305                                                 spin_unlock(&ifp->lock);
3306
3307                                                 spin_lock(&ifpub->lock);
3308                                                 ifpub->regen_count = 0;
3309                                                 spin_unlock(&ifpub->lock);
3310                                                 ipv6_create_tempaddr(ifpub, ifp);
3311                                                 in6_ifa_put(ifpub);
3312                                                 in6_ifa_put(ifp);
3313                                                 goto restart;
3314                                         }
3315                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3316                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3317                                 spin_unlock(&ifp->lock);
3318 #endif
3319                         } else {
3320                                 /* ifp->prefered_lft <= ifp->valid_lft */
3321                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3322                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3323                                 spin_unlock(&ifp->lock);
3324                         }
3325                 }
3326         }
3327
3328         next_sec = round_jiffies_up(next);
3329         next_sched = next;
3330
3331         /* If rounded timeout is accurate enough, accept it. */
3332         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3333                 next_sched = next_sec;
3334
3335         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3336         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3337                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3338
3339         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3340               now, next, next_sec, next_sched));
3341
3342         addr_chk_timer.expires = next_sched;
3343         add_timer(&addr_chk_timer);
3344         spin_unlock(&addrconf_verify_lock);
3345         rcu_read_unlock_bh();
3346 }
3347
3348 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3349 {
3350         struct in6_addr *pfx = NULL;
3351
3352         if (addr)
3353                 pfx = nla_data(addr);
3354
3355         if (local) {
3356                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3357                         pfx = NULL;
3358                 else
3359                         pfx = nla_data(local);
3360         }
3361
3362         return pfx;
3363 }
3364
3365 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3366         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3367         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3368         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3369 };
3370
3371 static int
3372 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3373 {
3374         struct net *net = sock_net(skb->sk);
3375         struct ifaddrmsg *ifm;
3376         struct nlattr *tb[IFA_MAX+1];
3377         struct in6_addr *pfx;
3378         int err;
3379
3380         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3381         if (err < 0)
3382                 return err;
3383
3384         ifm = nlmsg_data(nlh);
3385         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3386         if (pfx == NULL)
3387                 return -EINVAL;
3388
3389         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3390 }
3391
3392 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3393                              u32 prefered_lft, u32 valid_lft)
3394 {
3395         u32 flags;
3396         clock_t expires;
3397         unsigned long timeout;
3398
3399         if (!valid_lft || (prefered_lft > valid_lft))
3400                 return -EINVAL;
3401
3402         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3403         if (addrconf_finite_timeout(timeout)) {
3404                 expires = jiffies_to_clock_t(timeout * HZ);
3405                 valid_lft = timeout;
3406                 flags = RTF_EXPIRES;
3407         } else {
3408                 expires = 0;
3409                 flags = 0;
3410                 ifa_flags |= IFA_F_PERMANENT;
3411         }
3412
3413         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3414         if (addrconf_finite_timeout(timeout)) {
3415                 if (timeout == 0)
3416                         ifa_flags |= IFA_F_DEPRECATED;
3417                 prefered_lft = timeout;
3418         }
3419
3420         spin_lock_bh(&ifp->lock);
3421         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3422         ifp->tstamp = jiffies;
3423         ifp->valid_lft = valid_lft;
3424         ifp->prefered_lft = prefered_lft;
3425
3426         spin_unlock_bh(&ifp->lock);
3427         if (!(ifp->flags&IFA_F_TENTATIVE))
3428                 ipv6_ifa_notify(0, ifp);
3429
3430         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3431                               expires, flags);
3432         addrconf_verify(0);
3433
3434         return 0;
3435 }
3436
3437 static int
3438 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3439 {
3440         struct net *net = sock_net(skb->sk);
3441         struct ifaddrmsg *ifm;
3442         struct nlattr *tb[IFA_MAX+1];
3443         struct in6_addr *pfx;
3444         struct inet6_ifaddr *ifa;
3445         struct net_device *dev;
3446         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3447         u8 ifa_flags;
3448         int err;
3449
3450         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3451         if (err < 0)
3452                 return err;
3453
3454         ifm = nlmsg_data(nlh);
3455         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3456         if (pfx == NULL)
3457                 return -EINVAL;
3458
3459         if (tb[IFA_CACHEINFO]) {
3460                 struct ifa_cacheinfo *ci;
3461
3462                 ci = nla_data(tb[IFA_CACHEINFO]);
3463                 valid_lft = ci->ifa_valid;
3464                 preferred_lft = ci->ifa_prefered;
3465         } else {
3466                 preferred_lft = INFINITY_LIFE_TIME;
3467                 valid_lft = INFINITY_LIFE_TIME;
3468         }
3469
3470         dev =  __dev_get_by_index(net, ifm->ifa_index);
3471         if (dev == NULL)
3472                 return -ENODEV;
3473
3474         /* We ignore other flags so far. */
3475         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3476
3477         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3478         if (ifa == NULL) {
3479                 /*
3480                  * It would be best to check for !NLM_F_CREATE here but
3481                  * userspace alreay relies on not having to provide this.
3482                  */
3483                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3484                                       ifm->ifa_prefixlen, ifa_flags,
3485                                       preferred_lft, valid_lft);
3486         }
3487
3488         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3489             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3490                 err = -EEXIST;
3491         else
3492                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3493
3494         in6_ifa_put(ifa);
3495
3496         return err;
3497 }
3498
3499 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3500                           u8 scope, int ifindex)
3501 {
3502         struct ifaddrmsg *ifm;
3503
3504         ifm = nlmsg_data(nlh);
3505         ifm->ifa_family = AF_INET6;
3506         ifm->ifa_prefixlen = prefixlen;
3507         ifm->ifa_flags = flags;
3508         ifm->ifa_scope = scope;
3509         ifm->ifa_index = ifindex;
3510 }
3511
3512 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3513                          unsigned long tstamp, u32 preferred, u32 valid)
3514 {
3515         struct ifa_cacheinfo ci;
3516
3517         ci.cstamp = cstamp_delta(cstamp);
3518         ci.tstamp = cstamp_delta(tstamp);
3519         ci.ifa_prefered = preferred;
3520         ci.ifa_valid = valid;
3521
3522         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3523 }
3524
3525 static inline int rt_scope(int ifa_scope)
3526 {
3527         if (ifa_scope & IFA_HOST)
3528                 return RT_SCOPE_HOST;
3529         else if (ifa_scope & IFA_LINK)
3530                 return RT_SCOPE_LINK;
3531         else if (ifa_scope & IFA_SITE)
3532                 return RT_SCOPE_SITE;
3533         else
3534                 return RT_SCOPE_UNIVERSE;
3535 }
3536
3537 static inline int inet6_ifaddr_msgsize(void)
3538 {
3539         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3540                + nla_total_size(16) /* IFA_ADDRESS */
3541                + nla_total_size(sizeof(struct ifa_cacheinfo));
3542 }
3543
3544 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3545                              u32 portid, u32 seq, int event, unsigned int flags)
3546 {
3547         struct nlmsghdr  *nlh;
3548         u32 preferred, valid;
3549
3550         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3551         if (nlh == NULL)
3552                 return -EMSGSIZE;
3553
3554         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3555                       ifa->idev->dev->ifindex);
3556
3557         if (!(ifa->flags&IFA_F_PERMANENT)) {
3558                 preferred = ifa->prefered_lft;
3559                 valid = ifa->valid_lft;
3560                 if (preferred != INFINITY_LIFE_TIME) {
3561                         long tval = (jiffies - ifa->tstamp)/HZ;
3562                         if (preferred > tval)
3563                                 preferred -= tval;
3564                         else
3565                                 preferred = 0;
3566                         if (valid != INFINITY_LIFE_TIME) {
3567                                 if (valid > tval)
3568                                         valid -= tval;
3569                                 else
3570                                         valid = 0;
3571                         }
3572                 }
3573         } else {
3574                 preferred = INFINITY_LIFE_TIME;
3575                 valid = INFINITY_LIFE_TIME;
3576         }
3577
3578         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3579             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3580                 nlmsg_cancel(skb, nlh);
3581                 return -EMSGSIZE;
3582         }
3583
3584         return nlmsg_end(skb, nlh);
3585 }
3586
3587 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3588                                 u32 portid, u32 seq, int event, u16 flags)
3589 {
3590         struct nlmsghdr  *nlh;
3591         u8 scope = RT_SCOPE_UNIVERSE;
3592         int ifindex = ifmca->idev->dev->ifindex;
3593
3594         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3595                 scope = RT_SCOPE_SITE;
3596
3597         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3598         if (nlh == NULL)
3599                 return -EMSGSIZE;
3600
3601         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3602         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3603             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3604                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3605                 nlmsg_cancel(skb, nlh);
3606                 return -EMSGSIZE;
3607         }
3608
3609         return nlmsg_end(skb, nlh);
3610 }
3611
3612 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3613                                 u32 portid, u32 seq, int event, unsigned int flags)
3614 {
3615         struct nlmsghdr  *nlh;
3616         u8 scope = RT_SCOPE_UNIVERSE;
3617         int ifindex = ifaca->aca_idev->dev->ifindex;
3618
3619         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3620                 scope = RT_SCOPE_SITE;
3621
3622         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3623         if (nlh == NULL)
3624                 return -EMSGSIZE;
3625
3626         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3627         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3628             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3629                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3630                 nlmsg_cancel(skb, nlh);
3631                 return -EMSGSIZE;
3632         }
3633
3634         return nlmsg_end(skb, nlh);
3635 }
3636
3637 enum addr_type_t {
3638         UNICAST_ADDR,
3639         MULTICAST_ADDR,
3640         ANYCAST_ADDR,
3641 };
3642
3643 /* called with rcu_read_lock() */
3644 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3645                           struct netlink_callback *cb, enum addr_type_t type,
3646                           int s_ip_idx, int *p_ip_idx)
3647 {
3648         struct ifmcaddr6 *ifmca;
3649         struct ifacaddr6 *ifaca;
3650         int err = 1;
3651         int ip_idx = *p_ip_idx;
3652
3653         read_lock_bh(&idev->lock);
3654         switch (type) {
3655         case UNICAST_ADDR: {
3656                 struct inet6_ifaddr *ifa;
3657
3658                 /* unicast address incl. temp addr */
3659                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3660                         if (++ip_idx < s_ip_idx)
3661                                 continue;
3662                         err = inet6_fill_ifaddr(skb, ifa,
3663                                                 NETLINK_CB(cb->skb).portid,
3664                                                 cb->nlh->nlmsg_seq,
3665                                                 RTM_NEWADDR,
3666                                                 NLM_F_MULTI);
3667                         if (err <= 0)
3668                                 break;
3669                 }
3670                 break;
3671         }
3672         case MULTICAST_ADDR:
3673                 /* multicast address */
3674                 for (ifmca = idev->mc_list; ifmca;
3675                      ifmca = ifmca->next, ip_idx++) {
3676                         if (ip_idx < s_ip_idx)
3677                                 continue;
3678                         err = inet6_fill_ifmcaddr(skb, ifmca,
3679                                                   NETLINK_CB(cb->skb).portid,
3680                                                   cb->nlh->nlmsg_seq,
3681                                                   RTM_GETMULTICAST,
3682                                                   NLM_F_MULTI);
3683                         if (err <= 0)
3684                                 break;
3685                 }
3686                 break;
3687         case ANYCAST_ADDR:
3688                 /* anycast address */
3689                 for (ifaca = idev->ac_list; ifaca;
3690                      ifaca = ifaca->aca_next, ip_idx++) {
3691                         if (ip_idx < s_ip_idx)
3692                                 continue;
3693                         err = inet6_fill_ifacaddr(skb, ifaca,
3694                                                   NETLINK_CB(cb->skb).portid,
3695                                                   cb->nlh->nlmsg_seq,
3696                                                   RTM_GETANYCAST,
3697                                                   NLM_F_MULTI);
3698                         if (err <= 0)
3699                                 break;
3700                 }
3701                 break;
3702         default:
3703                 break;
3704         }
3705         read_unlock_bh(&idev->lock);
3706         *p_ip_idx = ip_idx;
3707         return err;
3708 }
3709
3710 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3711                            enum addr_type_t type)
3712 {
3713         struct net *net = sock_net(skb->sk);
3714         int h, s_h;
3715         int idx, ip_idx;
3716         int s_idx, s_ip_idx;
3717         struct net_device *dev;
3718         struct inet6_dev *idev;
3719         struct hlist_head *head;
3720         struct hlist_node *node;
3721
3722         s_h = cb->args[0];
3723         s_idx = idx = cb->args[1];
3724         s_ip_idx = ip_idx = cb->args[2];
3725
3726         rcu_read_lock();
3727         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3728                 idx = 0;
3729                 head = &net->dev_index_head[h];
3730                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3731                         if (idx < s_idx)
3732                                 goto cont;
3733                         if (h > s_h || idx > s_idx)
3734                                 s_ip_idx = 0;
3735                         ip_idx = 0;
3736                         idev = __in6_dev_get(dev);
3737                         if (!idev)
3738                                 goto cont;
3739
3740                         if (in6_dump_addrs(idev, skb, cb, type,
3741                                            s_ip_idx, &ip_idx) <= 0)
3742                                 goto done;
3743 cont:
3744                         idx++;
3745                 }
3746         }
3747 done:
3748         rcu_read_unlock();
3749         cb->args[0] = h;
3750         cb->args[1] = idx;
3751         cb->args[2] = ip_idx;
3752
3753         return skb->len;
3754 }
3755
3756 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3757 {
3758         enum addr_type_t type = UNICAST_ADDR;
3759
3760         return inet6_dump_addr(skb, cb, type);
3761 }
3762
3763 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3764 {
3765         enum addr_type_t type = MULTICAST_ADDR;
3766
3767         return inet6_dump_addr(skb, cb, type);
3768 }
3769
3770
3771 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3772 {
3773         enum addr_type_t type = ANYCAST_ADDR;
3774
3775         return inet6_dump_addr(skb, cb, type);
3776 }
3777
3778 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3779                              void *arg)
3780 {
3781         struct net *net = sock_net(in_skb->sk);
3782         struct ifaddrmsg *ifm;
3783         struct nlattr *tb[IFA_MAX+1];
3784         struct in6_addr *addr = NULL;
3785         struct net_device *dev = NULL;
3786         struct inet6_ifaddr *ifa;
3787         struct sk_buff *skb;
3788         int err;
3789
3790         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3791         if (err < 0)
3792                 goto errout;
3793
3794         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3795         if (addr == NULL) {
3796                 err = -EINVAL;
3797                 goto errout;
3798         }
3799
3800         ifm = nlmsg_data(nlh);
3801         if (ifm->ifa_index)
3802                 dev = __dev_get_by_index(net, ifm->ifa_index);
3803
3804         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3805         if (!ifa) {
3806                 err = -EADDRNOTAVAIL;
3807                 goto errout;
3808         }
3809
3810         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3811         if (!skb) {
3812                 err = -ENOBUFS;
3813                 goto errout_ifa;
3814         }
3815
3816         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3817                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3818         if (err < 0) {
3819                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3820                 WARN_ON(err == -EMSGSIZE);
3821                 kfree_skb(skb);
3822                 goto errout_ifa;
3823         }
3824         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3825 errout_ifa:
3826         in6_ifa_put(ifa);
3827 errout:
3828         return err;
3829 }
3830
3831 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3832 {
3833         struct sk_buff *skb;
3834         struct net *net = dev_net(ifa->idev->dev);
3835         int err = -ENOBUFS;
3836
3837         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3838         if (skb == NULL)
3839                 goto errout;
3840
3841         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3842         if (err < 0) {
3843                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3844                 WARN_ON(err == -EMSGSIZE);
3845                 kfree_skb(skb);
3846                 goto errout;
3847         }
3848         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3849         return;
3850 errout:
3851         if (err < 0)
3852                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3853 }
3854
3855 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3856                                 __s32 *array, int bytes)
3857 {
3858         BUG_ON(bytes < (DEVCONF_MAX * 4));
3859
3860         memset(array, 0, bytes);
3861         array[DEVCONF_FORWARDING] = cnf->forwarding;
3862         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3863         array[DEVCONF_MTU6] = cnf->mtu6;
3864         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3865         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3866         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3867         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3868         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3869         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3870                 jiffies_to_msecs(cnf->rtr_solicit_interval);
3871         array[DEVCONF_RTR_SOLICIT_DELAY] =
3872                 jiffies_to_msecs(cnf->rtr_solicit_delay);
3873         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3874 #ifdef CONFIG_IPV6_PRIVACY
3875         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3876         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3877         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3878         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3879         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3880 #endif
3881         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3882         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3883         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3884 #ifdef CONFIG_IPV6_ROUTER_PREF
3885         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3886         array[DEVCONF_RTR_PROBE_INTERVAL] =
3887                 jiffies_to_msecs(cnf->rtr_probe_interval);
3888 #ifdef CONFIG_IPV6_ROUTE_INFO
3889         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3890 #endif
3891 #endif
3892         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3893         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3894 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3895         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3896 #endif
3897 #ifdef CONFIG_IPV6_MROUTE
3898         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3899 #endif
3900         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3901         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3902         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3903 }
3904
3905 static inline size_t inet6_ifla6_size(void)
3906 {
3907         return nla_total_size(4) /* IFLA_INET6_FLAGS */
3908              + nla_total_size(sizeof(struct ifla_cacheinfo))
3909              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3910              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3911              + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3912 }
3913
3914 static inline size_t inet6_if_nlmsg_size(void)
3915 {
3916         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3917                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3918                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3919                + nla_total_size(4) /* IFLA_MTU */
3920                + nla_total_size(4) /* IFLA_LINK */
3921                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3922 }
3923
3924 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3925                                       int items, int bytes)
3926 {
3927         int i;
3928         int pad = bytes - sizeof(u64) * items;
3929         BUG_ON(pad < 0);
3930
3931         /* Use put_unaligned() because stats may not be aligned for u64. */
3932         put_unaligned(items, &stats[0]);
3933         for (i = 1; i < items; i++)
3934                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3935
3936         memset(&stats[items], 0, pad);
3937 }
3938
3939 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3940                                       int items, int bytes, size_t syncpoff)
3941 {
3942         int i;
3943         int pad = bytes - sizeof(u64) * items;
3944         BUG_ON(pad < 0);
3945
3946         /* Use put_unaligned() because stats may not be aligned for u64. */
3947         put_unaligned(items, &stats[0]);
3948         for (i = 1; i < items; i++)
3949                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3950
3951         memset(&stats[items], 0, pad);
3952 }
3953
3954 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3955                              int bytes)
3956 {
3957         switch (attrtype) {
3958         case IFLA_INET6_STATS:
3959                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3960                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3961                 break;
3962         case IFLA_INET6_ICMP6STATS:
3963                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3964                 break;
3965         }
3966 }
3967
3968 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3969 {
3970         struct nlattr *nla;
3971         struct ifla_cacheinfo ci;
3972
3973         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3974                 goto nla_put_failure;
3975         ci.max_reasm_len = IPV6_MAXPLEN;
3976         ci.tstamp = cstamp_delta(idev->tstamp);
3977         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3978         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3979         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3980                 goto nla_put_failure;
3981         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3982         if (nla == NULL)
3983                 goto nla_put_failure;
3984         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3985
3986         /* XXX - MC not implemented */
3987
3988         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3989         if (nla == NULL)
3990                 goto nla_put_failure;
3991         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3992
3993         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3994         if (nla == NULL)
3995                 goto nla_put_failure;
3996         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3997
3998         return 0;
3999
4000 nla_put_failure:
4001         return -EMSGSIZE;
4002 }
4003
4004 static size_t inet6_get_link_af_size(const struct net_device *dev)
4005 {
4006         if (!__in6_dev_get(dev))
4007                 return 0;
4008
4009         return inet6_ifla6_size();
4010 }
4011
4012 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4013 {
4014         struct inet6_dev *idev = __in6_dev_get(dev);
4015
4016         if (!idev)
4017                 return -ENODATA;
4018
4019         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4020                 return -EMSGSIZE;
4021
4022         return 0;
4023 }
4024
4025 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4026                              u32 portid, u32 seq, int event, unsigned int flags)
4027 {
4028         struct net_device *dev = idev->dev;
4029         struct ifinfomsg *hdr;
4030         struct nlmsghdr *nlh;
4031         void *protoinfo;
4032
4033         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4034         if (nlh == NULL)
4035                 return -EMSGSIZE;
4036
4037         hdr = nlmsg_data(nlh);
4038         hdr->ifi_family = AF_INET6;
4039         hdr->__ifi_pad = 0;
4040         hdr->ifi_type = dev->type;
4041         hdr->ifi_index = dev->ifindex;
4042         hdr->ifi_flags = dev_get_flags(dev);
4043         hdr->ifi_change = 0;
4044
4045         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4046             (dev->addr_len &&
4047              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4048             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4049             (dev->ifindex != dev->iflink &&
4050              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4051                 goto nla_put_failure;
4052         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4053         if (protoinfo == NULL)
4054                 goto nla_put_failure;
4055
4056         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4057                 goto nla_put_failure;
4058
4059         nla_nest_end(skb, protoinfo);
4060         return nlmsg_end(skb, nlh);
4061
4062 nla_put_failure:
4063         nlmsg_cancel(skb, nlh);
4064         return -EMSGSIZE;
4065 }
4066
4067 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4068 {
4069         struct net *net = sock_net(skb->sk);
4070         int h, s_h;
4071         int idx = 0, s_idx;
4072         struct net_device *dev;
4073         struct inet6_dev *idev;
4074         struct hlist_head *head;
4075         struct hlist_node *node;
4076
4077         s_h = cb->args[0];
4078         s_idx = cb->args[1];
4079
4080         rcu_read_lock();
4081         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4082                 idx = 0;
4083                 head = &net->dev_index_head[h];
4084                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4085                         if (idx < s_idx)
4086                                 goto cont;
4087                         idev = __in6_dev_get(dev);
4088                         if (!idev)
4089                                 goto cont;
4090                         if (inet6_fill_ifinfo(skb, idev,
4091                                               NETLINK_CB(cb->skb).portid,
4092                                               cb->nlh->nlmsg_seq,
4093                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4094                                 goto out;
4095 cont:
4096                         idx++;
4097                 }
4098         }
4099 out:
4100         rcu_read_unlock();
4101         cb->args[1] = idx;
4102         cb->args[0] = h;
4103
4104         return skb->len;
4105 }
4106
4107 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4108 {
4109         struct sk_buff *skb;
4110         struct net *net = dev_net(idev->dev);
4111         int err = -ENOBUFS;
4112
4113         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4114         if (skb == NULL)
4115                 goto errout;
4116
4117         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4118         if (err < 0) {
4119                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4120                 WARN_ON(err == -EMSGSIZE);
4121                 kfree_skb(skb);
4122                 goto errout;
4123         }
4124         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4125         return;
4126 errout:
4127         if (err < 0)
4128                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4129 }
4130
4131 static inline size_t inet6_prefix_nlmsg_size(void)
4132 {
4133         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4134                + nla_total_size(sizeof(struct in6_addr))
4135                + nla_total_size(sizeof(struct prefix_cacheinfo));
4136 }
4137
4138 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4139                              struct prefix_info *pinfo, u32 portid, u32 seq,
4140                              int event, unsigned int flags)
4141 {
4142         struct prefixmsg *pmsg;
4143         struct nlmsghdr *nlh;
4144         struct prefix_cacheinfo ci;
4145
4146         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4147         if (nlh == NULL)
4148                 return -EMSGSIZE;
4149
4150         pmsg = nlmsg_data(nlh);
4151         pmsg->prefix_family = AF_INET6;
4152         pmsg->prefix_pad1 = 0;
4153         pmsg->prefix_pad2 = 0;
4154         pmsg->prefix_ifindex = idev->dev->ifindex;
4155         pmsg->prefix_len = pinfo->prefix_len;
4156         pmsg->prefix_type = pinfo->type;
4157         pmsg->prefix_pad3 = 0;
4158         pmsg->prefix_flags = 0;
4159         if (pinfo->onlink)
4160                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4161         if (pinfo->autoconf)
4162                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4163
4164         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4165                 goto nla_put_failure;
4166         ci.preferred_time = ntohl(pinfo->prefered);
4167         ci.valid_time = ntohl(pinfo->valid);
4168         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4169                 goto nla_put_failure;
4170         return nlmsg_end(skb, nlh);
4171
4172 nla_put_failure:
4173         nlmsg_cancel(skb, nlh);
4174         return -EMSGSIZE;
4175 }
4176
4177 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4178                          struct prefix_info *pinfo)
4179 {
4180         struct sk_buff *skb;
4181         struct net *net = dev_net(idev->dev);
4182         int err = -ENOBUFS;
4183
4184         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4185         if (skb == NULL)
4186                 goto errout;
4187
4188         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4189         if (err < 0) {
4190                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4191                 WARN_ON(err == -EMSGSIZE);
4192                 kfree_skb(skb);
4193                 goto errout;
4194         }
4195         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4196         return;
4197 errout:
4198         if (err < 0)
4199                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4200 }
4201
4202 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4203 {
4204         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4205
4206         switch (event) {
4207         case RTM_NEWADDR:
4208                 /*
4209                  * If the address was optimistic
4210                  * we inserted the route at the start of
4211                  * our DAD process, so we don't need
4212                  * to do it again
4213                  */
4214                 if (!(ifp->rt->rt6i_node))
4215                         ip6_ins_rt(ifp->rt);
4216                 if (ifp->idev->cnf.forwarding)
4217                         addrconf_join_anycast(ifp);
4218                 break;
4219         case RTM_DELADDR:
4220                 if (ifp->idev->cnf.forwarding)
4221                         addrconf_leave_anycast(ifp);
4222                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4223                 dst_hold(&ifp->rt->dst);
4224
4225                 if (ip6_del_rt(ifp->rt))
4226                         dst_free(&ifp->rt->dst);
4227                 break;
4228         }
4229 }
4230
4231 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4232 {
4233         rcu_read_lock_bh();
4234         if (likely(ifp->idev->dead == 0))
4235                 __ipv6_ifa_notify(event, ifp);
4236         rcu_read_unlock_bh();
4237 }
4238
4239 #ifdef CONFIG_SYSCTL
4240
4241 static
4242 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4243                            void __user *buffer, size_t *lenp, loff_t *ppos)
4244 {
4245         int *valp = ctl->data;
4246         int val = *valp;
4247         loff_t pos = *ppos;
4248         ctl_table lctl;
4249         int ret;
4250
4251         /*
4252          * ctl->data points to idev->cnf.forwarding, we should
4253          * not modify it until we get the rtnl lock.
4254          */
4255         lctl = *ctl;
4256         lctl.data = &val;
4257
4258         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4259
4260         if (write)
4261                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4262         if (ret)
4263                 *ppos = pos;
4264         return ret;
4265 }
4266
4267 static void dev_disable_change(struct inet6_dev *idev)
4268 {
4269         if (!idev || !idev->dev)
4270                 return;
4271
4272         if (idev->cnf.disable_ipv6)
4273                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4274         else
4275                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4276 }
4277
4278 static void addrconf_disable_change(struct net *net, __s32 newf)
4279 {
4280         struct net_device *dev;
4281         struct inet6_dev *idev;
4282
4283         rcu_read_lock();
4284         for_each_netdev_rcu(net, dev) {
4285                 idev = __in6_dev_get(dev);
4286                 if (idev) {
4287                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4288                         idev->cnf.disable_ipv6 = newf;
4289                         if (changed)
4290                                 dev_disable_change(idev);
4291                 }
4292         }
4293         rcu_read_unlock();
4294 }
4295
4296 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4297 {
4298         struct net *net;
4299         int old;
4300
4301         if (!rtnl_trylock())
4302                 return restart_syscall();
4303
4304         net = (struct net *)table->extra2;
4305         old = *p;
4306         *p = newf;
4307
4308         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4309                 rtnl_unlock();
4310                 return 0;
4311         }
4312
4313         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4314                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4315                 addrconf_disable_change(net, newf);
4316         } else if ((!newf) ^ (!old))
4317                 dev_disable_change((struct inet6_dev *)table->extra1);
4318
4319         rtnl_unlock();
4320         return 0;
4321 }
4322
4323 static
4324 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4325                             void __user *buffer, size_t *lenp, loff_t *ppos)
4326 {
4327         int *valp = ctl->data;
4328         int val = *valp;
4329         loff_t pos = *ppos;
4330         ctl_table lctl;
4331         int ret;
4332
4333         /*
4334          * ctl->data points to idev->cnf.disable_ipv6, we should
4335          * not modify it until we get the rtnl lock.
4336          */
4337         lctl = *ctl;
4338         lctl.data = &val;
4339
4340         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4341
4342         if (write)
4343                 ret = addrconf_disable_ipv6(ctl, valp, val);
4344         if (ret)
4345                 *ppos = pos;
4346         return ret;
4347 }
4348
4349 static struct addrconf_sysctl_table
4350 {
4351         struct ctl_table_header *sysctl_header;
4352         ctl_table addrconf_vars[DEVCONF_MAX+1];
4353 } addrconf_sysctl __read_mostly = {
4354         .sysctl_header = NULL,
4355         .addrconf_vars = {
4356                 {
4357                         .procname       = "forwarding",
4358                         .data           = &ipv6_devconf.forwarding,
4359                         .maxlen         = sizeof(int),
4360                         .mode           = 0644,
4361                         .proc_handler   = addrconf_sysctl_forward,
4362                 },
4363                 {
4364                         .procname       = "hop_limit",
4365                         .data           = &ipv6_devconf.hop_limit,
4366                         .maxlen         = sizeof(int),
4367                         .mode           = 0644,
4368                         .proc_handler   = proc_dointvec,
4369                 },
4370                 {
4371                         .procname       = "mtu",
4372                         .data           = &ipv6_devconf.mtu6,
4373                         .maxlen         = sizeof(int),
4374                         .mode           = 0644,
4375                         .proc_handler   = proc_dointvec,
4376                 },
4377                 {
4378                         .procname       = "accept_ra",
4379                         .data           = &ipv6_devconf.accept_ra,
4380                         .maxlen         = sizeof(int),
4381                         .mode           = 0644,
4382                         .proc_handler   = proc_dointvec,
4383                 },
4384                 {
4385                         .procname       = "accept_redirects",
4386                         .data           = &ipv6_devconf.accept_redirects,
4387                         .maxlen         = sizeof(int),
4388                         .mode           = 0644,
4389                         .proc_handler   = proc_dointvec,
4390                 },
4391                 {
4392                         .procname       = "autoconf",
4393                         .data           = &ipv6_devconf.autoconf,
4394                         .maxlen         = sizeof(int),
4395                         .mode           = 0644,
4396                         .proc_handler   = proc_dointvec,
4397                 },
4398                 {
4399                         .procname       = "dad_transmits",
4400                         .data           = &ipv6_devconf.dad_transmits,
4401                         .maxlen         = sizeof(int),
4402                         .mode           = 0644,
4403                         .proc_handler   = proc_dointvec,
4404                 },
4405                 {
4406                         .procname       = "router_solicitations",
4407                         .data           = &ipv6_devconf.rtr_solicits,
4408                         .maxlen         = sizeof(int),
4409                         .mode           = 0644,
4410                         .proc_handler   = proc_dointvec,
4411                 },
4412                 {
4413                         .procname       = "router_solicitation_interval",
4414                         .data           = &ipv6_devconf.rtr_solicit_interval,
4415                         .maxlen         = sizeof(int),
4416                         .mode           = 0644,
4417                         .proc_handler   = proc_dointvec_jiffies,
4418                 },
4419                 {
4420                         .procname       = "router_solicitation_delay",
4421                         .data           = &ipv6_devconf.rtr_solicit_delay,
4422                         .maxlen         = sizeof(int),
4423                         .mode           = 0644,
4424                         .proc_handler   = proc_dointvec_jiffies,
4425                 },
4426                 {
4427                         .procname       = "force_mld_version",
4428                         .data           = &ipv6_devconf.force_mld_version,
4429                         .maxlen         = sizeof(int),
4430                         .mode           = 0644,
4431                         .proc_handler   = proc_dointvec,
4432                 },
4433 #ifdef CONFIG_IPV6_PRIVACY
4434                 {
4435                         .procname       = "use_tempaddr",
4436                         .data           = &ipv6_devconf.use_tempaddr,
4437                         .maxlen         = sizeof(int),
4438                         .mode           = 0644,
4439                         .proc_handler   = proc_dointvec,
4440                 },
4441                 {
4442                         .procname       = "temp_valid_lft",
4443                         .data           = &ipv6_devconf.temp_valid_lft,
4444                         .maxlen         = sizeof(int),
4445                         .mode           = 0644,
4446                         .proc_handler   = proc_dointvec,
4447                 },
4448                 {
4449                         .procname       = "temp_prefered_lft",
4450                         .data           = &ipv6_devconf.temp_prefered_lft,
4451                         .maxlen         = sizeof(int),
4452                         .mode           = 0644,
4453                         .proc_handler   = proc_dointvec,
4454                 },
4455                 {
4456                         .procname       = "regen_max_retry",
4457                         .data           = &ipv6_devconf.regen_max_retry,
4458                         .maxlen         = sizeof(int),
4459                         .mode           = 0644,
4460                         .proc_handler   = proc_dointvec,
4461                 },
4462                 {
4463                         .procname       = "max_desync_factor",
4464                         .data           = &ipv6_devconf.max_desync_factor,
4465                         .maxlen         = sizeof(int),
4466                         .mode           = 0644,
4467                         .proc_handler   = proc_dointvec,
4468                 },
4469 #endif
4470                 {
4471                         .procname       = "max_addresses",
4472                         .data           = &ipv6_devconf.max_addresses,
4473                         .maxlen         = sizeof(int),
4474                         .mode           = 0644,
4475                         .proc_handler   = proc_dointvec,
4476                 },
4477                 {
4478                         .procname       = "accept_ra_defrtr",
4479                         .data           = &ipv6_devconf.accept_ra_defrtr,
4480                         .maxlen         = sizeof(int),
4481                         .mode           = 0644,
4482                         .proc_handler   = proc_dointvec,
4483                 },
4484                 {
4485                         .procname       = "accept_ra_pinfo",
4486                         .data           = &ipv6_devconf.accept_ra_pinfo,
4487                         .maxlen         = sizeof(int),
4488                         .mode           = 0644,
4489                         .proc_handler   = proc_dointvec,
4490                 },
4491 #ifdef CONFIG_IPV6_ROUTER_PREF
4492                 {
4493                         .procname       = "accept_ra_rtr_pref",
4494                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4495                         .maxlen         = sizeof(int),
4496                         .mode           = 0644,
4497                         .proc_handler   = proc_dointvec,
4498                 },
4499                 {
4500                         .procname       = "router_probe_interval",
4501                         .data           = &ipv6_devconf.rtr_probe_interval,
4502                         .maxlen         = sizeof(int),
4503                         .mode           = 0644,
4504                         .proc_handler   = proc_dointvec_jiffies,
4505                 },
4506 #ifdef CONFIG_IPV6_ROUTE_INFO
4507                 {
4508                         .procname       = "accept_ra_rt_info_max_plen",
4509                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4510                         .maxlen         = sizeof(int),
4511                         .mode           = 0644,
4512                         .proc_handler   = proc_dointvec,
4513                 },
4514 #endif
4515 #endif
4516                 {
4517                         .procname       = "proxy_ndp",
4518                         .data           = &ipv6_devconf.proxy_ndp,
4519                         .maxlen         = sizeof(int),
4520                         .mode           = 0644,
4521                         .proc_handler   = proc_dointvec,
4522                 },
4523                 {
4524                         .procname       = "accept_source_route",
4525                         .data           = &ipv6_devconf.accept_source_route,
4526                         .maxlen         = sizeof(int),
4527                         .mode           = 0644,
4528                         .proc_handler   = proc_dointvec,
4529                 },
4530 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4531                 {
4532                         .procname       = "optimistic_dad",
4533                         .data           = &ipv6_devconf.optimistic_dad,
4534                         .maxlen         = sizeof(int),
4535                         .mode           = 0644,
4536                         .proc_handler   = proc_dointvec,
4537
4538                 },
4539 #endif
4540 #ifdef CONFIG_IPV6_MROUTE
4541                 {
4542                         .procname       = "mc_forwarding",
4543                         .data           = &ipv6_devconf.mc_forwarding,
4544                         .maxlen         = sizeof(int),
4545                         .mode           = 0444,
4546                         .proc_handler   = proc_dointvec,
4547                 },
4548 #endif
4549                 {
4550                         .procname       = "disable_ipv6",
4551                         .data           = &ipv6_devconf.disable_ipv6,
4552                         .maxlen         = sizeof(int),
4553                         .mode           = 0644,
4554                         .proc_handler   = addrconf_sysctl_disable,
4555                 },
4556                 {
4557                         .procname       = "accept_dad",
4558                         .data           = &ipv6_devconf.accept_dad,
4559                         .maxlen         = sizeof(int),
4560                         .mode           = 0644,
4561                         .proc_handler   = proc_dointvec,
4562                 },
4563                 {
4564                         .procname       = "force_tllao",
4565                         .data           = &ipv6_devconf.force_tllao,
4566                         .maxlen         = sizeof(int),
4567                         .mode           = 0644,
4568                         .proc_handler   = proc_dointvec
4569                 },
4570                 {
4571                         /* sentinel */
4572                 }
4573         },
4574 };
4575
4576 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4577                 struct inet6_dev *idev, struct ipv6_devconf *p)
4578 {
4579         int i;
4580         struct addrconf_sysctl_table *t;
4581         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4582
4583         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4584         if (t == NULL)
4585                 goto out;
4586
4587         for (i = 0; t->addrconf_vars[i].data; i++) {
4588                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4589                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4590                 t->addrconf_vars[i].extra2 = net;
4591         }
4592
4593         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4594
4595         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4596         if (t->sysctl_header == NULL)
4597                 goto free;
4598
4599         p->sysctl = t;
4600         return 0;
4601
4602 free:
4603         kfree(t);
4604 out:
4605         return -ENOBUFS;
4606 }
4607
4608 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4609 {
4610         struct addrconf_sysctl_table *t;
4611
4612         if (p->sysctl == NULL)
4613                 return;
4614
4615         t = p->sysctl;
4616         p->sysctl = NULL;
4617         unregister_net_sysctl_table(t->sysctl_header);
4618         kfree(t);
4619 }
4620
4621 static void addrconf_sysctl_register(struct inet6_dev *idev)
4622 {
4623         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4624                               &ndisc_ifinfo_sysctl_change);
4625         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4626                                         idev, &idev->cnf);
4627 }
4628
4629 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4630 {
4631         __addrconf_sysctl_unregister(&idev->cnf);
4632         neigh_sysctl_unregister(idev->nd_parms);
4633 }
4634
4635
4636 #endif
4637
4638 static int __net_init addrconf_init_net(struct net *net)
4639 {
4640         int err;
4641         struct ipv6_devconf *all, *dflt;
4642
4643         err = -ENOMEM;
4644         all = &ipv6_devconf;
4645         dflt = &ipv6_devconf_dflt;
4646
4647         if (!net_eq(net, &init_net)) {
4648                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4649                 if (all == NULL)
4650                         goto err_alloc_all;
4651
4652                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4653                 if (dflt == NULL)
4654                         goto err_alloc_dflt;
4655         } else {
4656                 /* these will be inherited by all namespaces */
4657                 dflt->autoconf = ipv6_defaults.autoconf;
4658                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4659         }
4660
4661         net->ipv6.devconf_all = all;
4662         net->ipv6.devconf_dflt = dflt;
4663
4664 #ifdef CONFIG_SYSCTL
4665         err = __addrconf_sysctl_register(net, "all", NULL, all);
4666         if (err < 0)
4667                 goto err_reg_all;
4668
4669         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4670         if (err < 0)
4671                 goto err_reg_dflt;
4672 #endif
4673         return 0;
4674
4675 #ifdef CONFIG_SYSCTL
4676 err_reg_dflt:
4677         __addrconf_sysctl_unregister(all);
4678 err_reg_all:
4679         kfree(dflt);
4680 #endif
4681 err_alloc_dflt:
4682         kfree(all);
4683 err_alloc_all:
4684         return err;
4685 }
4686
4687 static void __net_exit addrconf_exit_net(struct net *net)
4688 {
4689 #ifdef CONFIG_SYSCTL
4690         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4691         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4692 #endif
4693         if (!net_eq(net, &init_net)) {
4694                 kfree(net->ipv6.devconf_dflt);
4695                 kfree(net->ipv6.devconf_all);
4696         }
4697 }
4698
4699 static struct pernet_operations addrconf_ops = {
4700         .init = addrconf_init_net,
4701         .exit = addrconf_exit_net,
4702 };
4703
4704 /*
4705  *      Device notifier
4706  */
4707
4708 int register_inet6addr_notifier(struct notifier_block *nb)
4709 {
4710         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4711 }
4712 EXPORT_SYMBOL(register_inet6addr_notifier);
4713
4714 int unregister_inet6addr_notifier(struct notifier_block *nb)
4715 {
4716         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4717 }
4718 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4719
4720 static struct rtnl_af_ops inet6_ops = {
4721         .family           = AF_INET6,
4722         .fill_link_af     = inet6_fill_link_af,
4723         .get_link_af_size = inet6_get_link_af_size,
4724 };
4725
4726 /*
4727  *      Init / cleanup code
4728  */
4729
4730 int __init addrconf_init(void)
4731 {
4732         int i, err;
4733
4734         err = ipv6_addr_label_init();
4735         if (err < 0) {
4736                 pr_crit("%s: cannot initialize default policy table: %d\n",
4737                         __func__, err);
4738                 goto out;
4739         }
4740
4741         err = register_pernet_subsys(&addrconf_ops);
4742         if (err < 0)
4743                 goto out_addrlabel;
4744
4745         /* The addrconf netdev notifier requires that loopback_dev
4746          * has it's ipv6 private information allocated and setup
4747          * before it can bring up and give link-local addresses
4748          * to other devices which are up.
4749          *
4750          * Unfortunately, loopback_dev is not necessarily the first
4751          * entry in the global dev_base list of net devices.  In fact,
4752          * it is likely to be the very last entry on that list.
4753          * So this causes the notifier registry below to try and
4754          * give link-local addresses to all devices besides loopback_dev
4755          * first, then loopback_dev, which cases all the non-loopback_dev
4756          * devices to fail to get a link-local address.
4757          *
4758          * So, as a temporary fix, allocate the ipv6 structure for
4759          * loopback_dev first by hand.
4760          * Longer term, all of the dependencies ipv6 has upon the loopback
4761          * device and it being up should be removed.
4762          */
4763         rtnl_lock();
4764         if (!ipv6_add_dev(init_net.loopback_dev))
4765                 err = -ENOMEM;
4766         rtnl_unlock();
4767         if (err)
4768                 goto errlo;
4769
4770         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4771                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4772
4773         register_netdevice_notifier(&ipv6_dev_notf);
4774
4775         addrconf_verify(0);
4776
4777         err = rtnl_af_register(&inet6_ops);
4778         if (err < 0)
4779                 goto errout_af;
4780
4781         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4782                               NULL);
4783         if (err < 0)
4784                 goto errout;
4785
4786         /* Only the first call to __rtnl_register can fail */
4787         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4788         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4789         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4790                         inet6_dump_ifaddr, NULL);
4791         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4792                         inet6_dump_ifmcaddr, NULL);
4793         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4794                         inet6_dump_ifacaddr, NULL);
4795
4796         ipv6_addr_label_rtnl_register();
4797
4798         return 0;
4799 errout:
4800         rtnl_af_unregister(&inet6_ops);
4801 errout_af:
4802         unregister_netdevice_notifier(&ipv6_dev_notf);
4803 errlo:
4804         unregister_pernet_subsys(&addrconf_ops);
4805 out_addrlabel:
4806         ipv6_addr_label_cleanup();
4807 out:
4808         return err;
4809 }
4810
4811 void addrconf_cleanup(void)
4812 {
4813         struct net_device *dev;
4814         int i;
4815
4816         unregister_netdevice_notifier(&ipv6_dev_notf);
4817         unregister_pernet_subsys(&addrconf_ops);
4818         ipv6_addr_label_cleanup();
4819
4820         rtnl_lock();
4821
4822         __rtnl_af_unregister(&inet6_ops);
4823
4824         /* clean dev list */
4825         for_each_netdev(&init_net, dev) {
4826                 if (__in6_dev_get(dev) == NULL)
4827                         continue;
4828                 addrconf_ifdown(dev, 1);
4829         }
4830         addrconf_ifdown(init_net.loopback_dev, 2);
4831
4832         /*
4833          *      Check hash table.
4834          */
4835         spin_lock_bh(&addrconf_hash_lock);
4836         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4837                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4838         spin_unlock_bh(&addrconf_hash_lock);
4839
4840         del_timer(&addr_chk_timer);
4841         rtnl_unlock();
4842 }