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 #include <linux/netconf.h>
  85
  86 #ifdef CONFIG_IPV6_PRIVACY
  87 #include <linux/random.h>
  88 #endif
  89
  90 #include <linux/uaccess.h>
  91 #include <asm/unaligned.h>
  92
  93 #include <linux/proc_fs.h>
  94 #include <linux/seq_file.h>
  95 #include <linux/export.h>
  96
  97 /* Set to 3 to get tracing... */
  98 #define ACONF_DEBUG 2
  99
 100 #if ACONF_DEBUG >= 3
 101 #define ADBG(x) printk x
 102 #else
 103 #define ADBG(x)
 104 #endif
 105
 106 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 107
 108 static inline u32 cstamp_delta(unsigned long cstamp)
 109 {
 110         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 111 }
 112
 113 #ifdef CONFIG_SYSCTL
 114 static void addrconf_sysctl_register(struct inet6_dev *idev);
 115 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 116 #else
 117 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 118 {
 119 }
 120
 121 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 122 {
 123 }
 124 #endif
 125
 126 #ifdef CONFIG_IPV6_PRIVACY
 127 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 128 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 129 static void ipv6_regen_rndid(unsigned long data);
 130 #endif
 131
 132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 133 static int ipv6_count_addresses(struct inet6_dev *idev);
 134
 135 /*
 136  *      Configured unicast address hash table
 137  */
 138 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 139 static DEFINE_SPINLOCK(addrconf_hash_lock);
 140
 141 static void addrconf_verify(unsigned long);
 142
 143 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 144 static DEFINE_SPINLOCK(addrconf_verify_lock);
 145
 146 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 147 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 148
 149 static void addrconf_type_change(struct net_device *dev,
 150                                  unsigned long event);
 151 static int addrconf_ifdown(struct net_device *dev, int how);
 152
 153 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 154                                                   int plen,
 155                                                   const struct net_device *dev,
 156                                                   u32 flags, u32 noflags);
 157
 158 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 159 static void addrconf_dad_timer(unsigned long data);
 160 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 161 static void addrconf_dad_run(struct inet6_dev *idev);
 162 static void addrconf_rs_timer(unsigned long data);
 163 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 164 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 165
 166 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 167                                 struct prefix_info *pinfo);
 168 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 169                                struct net_device *dev);
 170
 171 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
 172
 173 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 174         .forwarding             = 0,
 175         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 176         .mtu6                   = IPV6_MIN_MTU,
 177         .accept_ra              = 1,
 178         .accept_redirects       = 1,
 179         .autoconf               = 1,
 180         .force_mld_version      = 0,
 181         .dad_transmits          = 1,
 182         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 183         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 184         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 185 #ifdef CONFIG_IPV6_PRIVACY
 186         .use_tempaddr           = 0,
 187         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 188         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 189         .regen_max_retry        = REGEN_MAX_RETRY,
 190         .max_desync_factor      = MAX_DESYNC_FACTOR,
 191 #endif
 192         .max_addresses          = IPV6_MAX_ADDRESSES,
 193         .accept_ra_defrtr       = 1,
 194         .accept_ra_pinfo        = 1,
 195 #ifdef CONFIG_IPV6_ROUTER_PREF
 196         .accept_ra_rtr_pref     = 1,
 197         .rtr_probe_interval     = 60 * HZ,
 198 #ifdef CONFIG_IPV6_ROUTE_INFO
 199         .accept_ra_rt_info_max_plen = 0,
 200 #endif
 201 #endif
 202         .proxy_ndp              = 0,
 203         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 204         .disable_ipv6           = 0,
 205         .accept_dad             = 1,
 206 };
 207
 208 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 209         .forwarding             = 0,
 210         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 211         .mtu6                   = IPV6_MIN_MTU,
 212         .accept_ra              = 1,
 213         .accept_redirects       = 1,
 214         .autoconf               = 1,
 215         .dad_transmits          = 1,
 216         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 217         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 218         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 219 #ifdef CONFIG_IPV6_PRIVACY
 220         .use_tempaddr           = 0,
 221         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 222         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 223         .regen_max_retry        = REGEN_MAX_RETRY,
 224         .max_desync_factor      = MAX_DESYNC_FACTOR,
 225 #endif
 226         .max_addresses          = IPV6_MAX_ADDRESSES,
 227         .accept_ra_defrtr       = 1,
 228         .accept_ra_pinfo        = 1,
 229 #ifdef CONFIG_IPV6_ROUTER_PREF
 230         .accept_ra_rtr_pref     = 1,
 231         .rtr_probe_interval     = 60 * HZ,
 232 #ifdef CONFIG_IPV6_ROUTE_INFO
 233         .accept_ra_rt_info_max_plen = 0,
 234 #endif
 235 #endif
 236         .proxy_ndp              = 0,
 237         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 238         .disable_ipv6           = 0,
 239         .accept_dad             = 1,
 240 };
 241
 242 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 243 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 244 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 245 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 246 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 247 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
 248 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
 249 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
 250
 251 /* Check if a valid qdisc is available */
 252 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 253 {
 254         return !qdisc_tx_is_noop(dev);
 255 }
 256
 257 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 258 {
 259         if (del_timer(&ifp->timer))
 260                 __in6_ifa_put(ifp);
 261 }
 262
 263 enum addrconf_timer_t {
 264         AC_NONE,
 265         AC_DAD,
 266         AC_RS,
 267 };
 268
 269 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 270                                enum addrconf_timer_t what,
 271                                unsigned long when)
 272 {
 273         if (!del_timer(&ifp->timer))
 274                 in6_ifa_hold(ifp);
 275
 276         switch (what) {
 277         case AC_DAD:
 278                 ifp->timer.function = addrconf_dad_timer;
 279                 break;
 280         case AC_RS:
 281                 ifp->timer.function = addrconf_rs_timer;
 282                 break;
 283         default:
 284                 break;
 285         }
 286         ifp->timer.expires = jiffies + when;
 287         add_timer(&ifp->timer);
 288 }
 289
 290 static int snmp6_alloc_dev(struct inet6_dev *idev)
 291 {
 292         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 293                           sizeof(struct ipstats_mib),
 294                           __alignof__(struct ipstats_mib)) < 0)
 295                 goto err_ip;
 296         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 297                                         GFP_KERNEL);
 298         if (!idev->stats.icmpv6dev)
 299                 goto err_icmp;
 300         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 301                                            GFP_KERNEL);
 302         if (!idev->stats.icmpv6msgdev)
 303                 goto err_icmpmsg;
 304
 305         return 0;
 306
 307 err_icmpmsg:
 308         kfree(idev->stats.icmpv6dev);
 309 err_icmp:
 310         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 311 err_ip:
 312         return -ENOMEM;
 313 }
 314
 315 static void snmp6_free_dev(struct inet6_dev *idev)
 316 {
 317         kfree(idev->stats.icmpv6msgdev);
 318         kfree(idev->stats.icmpv6dev);
 319         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 320 }
 321
 322 /* Nobody refers to this device, we may destroy it. */
 323
 324 void in6_dev_finish_destroy(struct inet6_dev *idev)
 325 {
 326         struct net_device *dev = idev->dev;
 327
 328         WARN_ON(!list_empty(&idev->addr_list));
 329         WARN_ON(idev->mc_list != NULL);
 330
 331 #ifdef NET_REFCNT_DEBUG
 332         pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
 333 #endif
 334         dev_put(dev);
 335         if (!idev->dead) {
 336                 pr_warn("Freeing alive inet6 device %p\n", idev);
 337                 return;
 338         }
 339         snmp6_free_dev(idev);
 340         kfree_rcu(idev, rcu);
 341 }
 342 EXPORT_SYMBOL(in6_dev_finish_destroy);
 343
 344 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 345 {
 346         struct inet6_dev *ndev;
 347
 348         ASSERT_RTNL();
 349
 350         if (dev->mtu < IPV6_MIN_MTU)
 351                 return NULL;
 352
 353         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 354
 355         if (ndev == NULL)
 356                 return NULL;
 357
 358         rwlock_init(&ndev->lock);
 359         ndev->dev = dev;
 360         INIT_LIST_HEAD(&ndev->addr_list);
 361
 362         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 363         ndev->cnf.mtu6 = dev->mtu;
 364         ndev->cnf.sysctl = NULL;
 365         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 366         if (ndev->nd_parms == NULL) {
 367                 kfree(ndev);
 368                 return NULL;
 369         }
 370         if (ndev->cnf.forwarding)
 371                 dev_disable_lro(dev);
 372         /* We refer to the device */
 373         dev_hold(dev);
 374
 375         if (snmp6_alloc_dev(ndev) < 0) {
 376                 ADBG((KERN_WARNING
 377                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 378                         __func__, dev->name));
 379                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 380                 dev_put(dev);
 381                 kfree(ndev);
 382                 return NULL;
 383         }
 384
 385         if (snmp6_register_dev(ndev) < 0) {
 386                 ADBG((KERN_WARNING
 387                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 388                         __func__, dev->name));
 389                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 390                 ndev->dead = 1;
 391                 in6_dev_finish_destroy(ndev);
 392                 return NULL;
 393         }
 394
 395         /* One reference from device.  We must do this before
 396          * we invoke __ipv6_regen_rndid().
 397          */
 398         in6_dev_hold(ndev);
 399
 400         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 401                 ndev->cnf.accept_dad = -1;
 402
 403 #if IS_ENABLED(CONFIG_IPV6_SIT)
 404         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 405                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 406                 ndev->cnf.rtr_solicits = 0;
 407         }
 408 #endif
 409
 410 #ifdef CONFIG_IPV6_PRIVACY
 411         INIT_LIST_HEAD(&ndev->tempaddr_list);
 412         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 413         if ((dev->flags&IFF_LOOPBACK) ||
 414             dev->type == ARPHRD_TUNNEL ||
 415             dev->type == ARPHRD_TUNNEL6 ||
 416             dev->type == ARPHRD_SIT ||
 417             dev->type == ARPHRD_NONE) {
 418                 ndev->cnf.use_tempaddr = -1;
 419         } else {
 420                 in6_dev_hold(ndev);
 421                 ipv6_regen_rndid((unsigned long) ndev);
 422         }
 423 #endif
 424
 425         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 426                 ndev->if_flags |= IF_READY;
 427
 428         ipv6_mc_init_dev(ndev);
 429         ndev->tstamp = jiffies;
 430         addrconf_sysctl_register(ndev);
 431         /* protected by rtnl_lock */
 432         rcu_assign_pointer(dev->ip6_ptr, ndev);
 433
 434         /* Join interface-local all-node multicast group */
 435         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 436
 437         /* Join all-node multicast group */
 438         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 439
 440         /* Join all-router multicast group if forwarding is set */
 441         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 442                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 443
 444         return ndev;
 445 }
 446
 447 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 448 {
 449         struct inet6_dev *idev;
 450
 451         ASSERT_RTNL();
 452
 453         idev = __in6_dev_get(dev);
 454         if (!idev) {
 455                 idev = ipv6_add_dev(dev);
 456                 if (!idev)
 457                         return NULL;
 458         }
 459
 460         if (dev->flags&IFF_UP)
 461                 ipv6_mc_up(idev);
 462         return idev;
 463 }
 464
 465 static int inet6_netconf_msgsize_devconf(int type)
 466 {
 467         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 468                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 469
 470         /* type -1 is used for ALL */
 471         if (type == -1 || type == NETCONFA_FORWARDING)
 472                 size += nla_total_size(4);
 473 #ifdef CONFIG_IPV6_MROUTE
 474         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 475                 size += nla_total_size(4);
 476 #endif
 477
 478         return size;
 479 }
 480
 481 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 482                                       struct ipv6_devconf *devconf, u32 portid,
 483                                       u32 seq, int event, unsigned int flags,
 484                                       int type)
 485 {
 486         struct nlmsghdr  *nlh;
 487         struct netconfmsg *ncm;
 488
 489         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 490                         flags);
 491         if (nlh == NULL)
 492                 return -EMSGSIZE;
 493
 494         ncm = nlmsg_data(nlh);
 495         ncm->ncm_family = AF_INET6;
 496
 497         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 498                 goto nla_put_failure;
 499
 500         /* type -1 is used for ALL */
 501         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 502             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 503                 goto nla_put_failure;
 504 #ifdef CONFIG_IPV6_MROUTE
 505         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 506             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 507                         devconf->mc_forwarding) < 0)
 508                 goto nla_put_failure;
 509 #endif
 510         return nlmsg_end(skb, nlh);
 511
 512 nla_put_failure:
 513         nlmsg_cancel(skb, nlh);
 514         return -EMSGSIZE;
 515 }
 516
 517 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 518                                   struct ipv6_devconf *devconf)
 519 {
 520         struct sk_buff *skb;
 521         int err = -ENOBUFS;
 522
 523         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 524         if (skb == NULL)
 525                 goto errout;
 526
 527         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 528                                          RTM_NEWNETCONF, 0, type);
 529         if (err < 0) {
 530                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 531                 WARN_ON(err == -EMSGSIZE);
 532                 kfree_skb(skb);
 533                 goto errout;
 534         }
 535         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 536         return;
 537 errout:
 538         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 539 }
 540
 541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 542         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 543         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 544 };
 545
 546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 547                                      struct nlmsghdr *nlh,
 548                                      void *arg)
 549 {
 550         struct net *net = sock_net(in_skb->sk);
 551         struct nlattr *tb[NETCONFA_MAX+1];
 552         struct netconfmsg *ncm;
 553         struct sk_buff *skb;
 554         struct ipv6_devconf *devconf;
 555         struct inet6_dev *in6_dev;
 556         struct net_device *dev;
 557         int ifindex;
 558         int err;
 559
 560         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 561                           devconf_ipv6_policy);
 562         if (err < 0)
 563                 goto errout;
 564
 565         err = EINVAL;
 566         if (!tb[NETCONFA_IFINDEX])
 567                 goto errout;
 568
 569         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 570         switch (ifindex) {
 571         case NETCONFA_IFINDEX_ALL:
 572                 devconf = net->ipv6.devconf_all;
 573                 break;
 574         case NETCONFA_IFINDEX_DEFAULT:
 575                 devconf = net->ipv6.devconf_dflt;
 576                 break;
 577         default:
 578                 dev = __dev_get_by_index(net, ifindex);
 579                 if (dev == NULL)
 580                         goto errout;
 581                 in6_dev = __in6_dev_get(dev);
 582                 if (in6_dev == NULL)
 583                         goto errout;
 584                 devconf = &in6_dev->cnf;
 585                 break;
 586         }
 587
 588         err = -ENOBUFS;
 589         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 590         if (skb == NULL)
 591                 goto errout;
 592
 593         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 594                                          NETLINK_CB(in_skb).portid,
 595                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 596                                          -1);
 597         if (err < 0) {
 598                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 599                 WARN_ON(err == -EMSGSIZE);
 600                 kfree_skb(skb);
 601                 goto errout;
 602         }
 603         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 604 errout:
 605         return err;
 606 }
 607
 608 #ifdef CONFIG_SYSCTL
 609 static void dev_forward_change(struct inet6_dev *idev)
 610 {
 611         struct net_device *dev;
 612         struct inet6_ifaddr *ifa;
 613
 614         if (!idev)
 615                 return;
 616         dev = idev->dev;
 617         if (idev->cnf.forwarding)
 618                 dev_disable_lro(dev);
 619         if (dev->flags & IFF_MULTICAST) {
 620                 if (idev->cnf.forwarding) {
 621                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 622                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 623                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 624                 } else {
 625                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 626                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 627                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 628                 }
 629         }
 630
 631         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 632                 if (ifa->flags&IFA_F_TENTATIVE)
 633                         continue;
 634                 if (idev->cnf.forwarding)
 635                         addrconf_join_anycast(ifa);
 636                 else
 637                         addrconf_leave_anycast(ifa);
 638         }
 639         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 640                                      dev->ifindex, &idev->cnf);
 641 }
 642
 643
 644 static void addrconf_forward_change(struct net *net, __s32 newf)
 645 {
 646         struct net_device *dev;
 647         struct inet6_dev *idev;
 648
 649         for_each_netdev(net, dev) {
 650                 idev = __in6_dev_get(dev);
 651                 if (idev) {
 652                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 653                         idev->cnf.forwarding = newf;
 654                         if (changed)
 655                                 dev_forward_change(idev);
 656                 }
 657         }
 658 }
 659
 660 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 661 {
 662         struct net *net;
 663         int old;
 664
 665         if (!rtnl_trylock())
 666                 return restart_syscall();
 667
 668         net = (struct net *)table->extra2;
 669         old = *p;
 670         *p = newf;
 671
 672         if (p == &net->ipv6.devconf_dflt->forwarding) {
 673                 if ((!newf) ^ (!old))
 674                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 675                                                      NETCONFA_IFINDEX_DEFAULT,
 676                                                      net->ipv6.devconf_dflt);
 677                 rtnl_unlock();
 678                 return 0;
 679         }
 680
 681         if (p == &net->ipv6.devconf_all->forwarding) {
 682                 net->ipv6.devconf_dflt->forwarding = newf;
 683                 addrconf_forward_change(net, newf);
 684                 if ((!newf) ^ (!old))
 685                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 686                                                      NETCONFA_IFINDEX_ALL,
 687                                                      net->ipv6.devconf_all);
 688         } else if ((!newf) ^ (!old))
 689                 dev_forward_change((struct inet6_dev *)table->extra1);
 690         rtnl_unlock();
 691
 692         if (newf)
 693                 rt6_purge_dflt_routers(net);
 694         return 1;
 695 }
 696 #endif
 697
 698 /* Nobody refers to this ifaddr, destroy it */
 699 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 700 {
 701         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 702
 703 #ifdef NET_REFCNT_DEBUG
 704         pr_debug("%s\n", __func__);
 705 #endif
 706
 707         in6_dev_put(ifp->idev);
 708
 709         if (del_timer(&ifp->timer))
 710                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 711
 712         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 713                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 714                 return;
 715         }
 716         ip6_rt_put(ifp->rt);
 717
 718         kfree_rcu(ifp, rcu);
 719 }
 720
 721 static void
 722 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 723 {
 724         struct list_head *p;
 725         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 726
 727         /*
 728          * Each device address list is sorted in order of scope -
 729          * global before linklocal.
 730          */
 731         list_for_each(p, &idev->addr_list) {
 732                 struct inet6_ifaddr *ifa
 733                         = list_entry(p, struct inet6_ifaddr, if_list);
 734                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 735                         break;
 736         }
 737
 738         list_add_tail(&ifp->if_list, p);
 739 }
 740
 741 static u32 inet6_addr_hash(const struct in6_addr *addr)
 742 {
 743         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 744 }
 745
 746 /* On success it returns ifp with increased reference count */
 747
 748 static struct inet6_ifaddr *
 749 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 750               int scope, u32 flags)
 751 {
 752         struct inet6_ifaddr *ifa = NULL;
 753         struct rt6_info *rt;
 754         unsigned int hash;
 755         int err = 0;
 756         int addr_type = ipv6_addr_type(addr);
 757
 758         if (addr_type == IPV6_ADDR_ANY ||
 759             addr_type & IPV6_ADDR_MULTICAST ||
 760             (!(idev->dev->flags & IFF_LOOPBACK) &&
 761              addr_type & IPV6_ADDR_LOOPBACK))
 762                 return ERR_PTR(-EADDRNOTAVAIL);
 763
 764         rcu_read_lock_bh();
 765         if (idev->dead) {
 766                 err = -ENODEV;                  /*XXX*/
 767                 goto out2;
 768         }
 769
 770         if (idev->cnf.disable_ipv6) {
 771                 err = -EACCES;
 772                 goto out2;
 773         }
 774
 775         spin_lock(&addrconf_hash_lock);
 776
 777         /* Ignore adding duplicate addresses on an interface */
 778         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 779                 ADBG(("ipv6_add_addr: already assigned\n"));
 780                 err = -EEXIST;
 781                 goto out;
 782         }
 783
 784         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 785
 786         if (ifa == NULL) {
 787                 ADBG(("ipv6_add_addr: malloc failed\n"));
 788                 err = -ENOBUFS;
 789                 goto out;
 790         }
 791
 792         rt = addrconf_dst_alloc(idev, addr, false);
 793         if (IS_ERR(rt)) {
 794                 err = PTR_ERR(rt);
 795                 goto out;
 796         }
 797
 798         ifa->addr = *addr;
 799
 800         spin_lock_init(&ifa->lock);
 801         spin_lock_init(&ifa->state_lock);
 802         init_timer(&ifa->timer);
 803         INIT_HLIST_NODE(&ifa->addr_lst);
 804         ifa->timer.data = (unsigned long) ifa;
 805         ifa->scope = scope;
 806         ifa->prefix_len = pfxlen;
 807         ifa->flags = flags | IFA_F_TENTATIVE;
 808         ifa->cstamp = ifa->tstamp = jiffies;
 809
 810         ifa->rt = rt;
 811
 812         ifa->idev = idev;
 813         in6_dev_hold(idev);
 814         /* For caller */
 815         in6_ifa_hold(ifa);
 816
 817         /* Add to big hash table */
 818         hash = inet6_addr_hash(addr);
 819
 820         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 821         spin_unlock(&addrconf_hash_lock);
 822
 823         write_lock(&idev->lock);
 824         /* Add to inet6_dev unicast addr list. */
 825         ipv6_link_dev_addr(idev, ifa);
 826
 827 #ifdef CONFIG_IPV6_PRIVACY
 828         if (ifa->flags&IFA_F_TEMPORARY) {
 829                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 830                 in6_ifa_hold(ifa);
 831         }
 832 #endif
 833
 834         in6_ifa_hold(ifa);
 835         write_unlock(&idev->lock);
 836 out2:
 837         rcu_read_unlock_bh();
 838
 839         if (likely(err == 0))
 840                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
 841         else {
 842                 kfree(ifa);
 843                 ifa = ERR_PTR(err);
 844         }
 845
 846         return ifa;
 847 out:
 848         spin_unlock(&addrconf_hash_lock);
 849         goto out2;
 850 }
 851
 852 /* This function wants to get referenced ifp and releases it before return */
 853
 854 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 855 {
 856         struct inet6_ifaddr *ifa, *ifn;
 857         struct inet6_dev *idev = ifp->idev;
 858         int state;
 859         int deleted = 0, onlink = 0;
 860         unsigned long expires = jiffies;
 861
 862         spin_lock_bh(&ifp->state_lock);
 863         state = ifp->state;
 864         ifp->state = INET6_IFADDR_STATE_DEAD;
 865         spin_unlock_bh(&ifp->state_lock);
 866
 867         if (state == INET6_IFADDR_STATE_DEAD)
 868                 goto out;
 869
 870         spin_lock_bh(&addrconf_hash_lock);
 871         hlist_del_init_rcu(&ifp->addr_lst);
 872         spin_unlock_bh(&addrconf_hash_lock);
 873
 874         write_lock_bh(&idev->lock);
 875 #ifdef CONFIG_IPV6_PRIVACY
 876         if (ifp->flags&IFA_F_TEMPORARY) {
 877                 list_del(&ifp->tmp_list);
 878                 if (ifp->ifpub) {
 879                         in6_ifa_put(ifp->ifpub);
 880                         ifp->ifpub = NULL;
 881                 }
 882                 __in6_ifa_put(ifp);
 883         }
 884 #endif
 885
 886         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 887                 if (ifa == ifp) {
 888                         list_del_init(&ifp->if_list);
 889                         __in6_ifa_put(ifp);
 890
 891                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 892                                 break;
 893                         deleted = 1;
 894                         continue;
 895                 } else if (ifp->flags & IFA_F_PERMANENT) {
 896                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 897                                               ifp->prefix_len)) {
 898                                 if (ifa->flags & IFA_F_PERMANENT) {
 899                                         onlink = 1;
 900                                         if (deleted)
 901                                                 break;
 902                                 } else {
 903                                         unsigned long lifetime;
 904
 905                                         if (!onlink)
 906                                                 onlink = -1;
 907
 908                                         spin_lock(&ifa->lock);
 909
 910                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 911                                         /*
 912                                          * Note: Because this address is
 913                                          * not permanent, lifetime <
 914                                          * LONG_MAX / HZ here.
 915                                          */
 916                                         if (time_before(expires,
 917                                                         ifa->tstamp + lifetime * HZ))
 918                                                 expires = ifa->tstamp + lifetime * HZ;
 919                                         spin_unlock(&ifa->lock);
 920                                 }
 921                         }
 922                 }
 923         }
 924         write_unlock_bh(&idev->lock);
 925
 926         addrconf_del_timer(ifp);
 927
 928         ipv6_ifa_notify(RTM_DELADDR, ifp);
 929
 930         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
 931
 932         /*
 933          * Purge or update corresponding prefix
 934          *
 935          * 1) we don't purge prefix here if address was not permanent.
 936          *    prefix is managed by its own lifetime.
 937          * 2) if there're no addresses, delete prefix.
 938          * 3) if there're still other permanent address(es),
 939          *    corresponding prefix is still permanent.
 940          * 4) otherwise, update prefix lifetime to the
 941          *    longest valid lifetime among the corresponding
 942          *    addresses on the device.
 943          *    Note: subsequent RA will update lifetime.
 944          *
 945          * --yoshfuji
 946          */
 947         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 948                 struct in6_addr prefix;
 949                 struct rt6_info *rt;
 950
 951                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 952
 953                 rt = addrconf_get_prefix_route(&prefix,
 954                                                ifp->prefix_len,
 955                                                ifp->idev->dev,
 956                                                0, RTF_GATEWAY | RTF_DEFAULT);
 957
 958                 if (rt) {
 959                         if (onlink == 0) {
 960                                 ip6_del_rt(rt);
 961                                 rt = NULL;
 962                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 963                                 rt6_set_expires(rt, expires);
 964                         }
 965                 }
 966                 ip6_rt_put(rt);
 967         }
 968
 969         /* clean up prefsrc entries */
 970         rt6_remove_prefsrc(ifp);
 971 out:
 972         in6_ifa_put(ifp);
 973 }
 974
 975 #ifdef CONFIG_IPV6_PRIVACY
 976 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 977 {
 978         struct inet6_dev *idev = ifp->idev;
 979         struct in6_addr addr, *tmpaddr;
 980         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
 981         unsigned long regen_advance;
 982         int tmp_plen;
 983         int ret = 0;
 984         int max_addresses;
 985         u32 addr_flags;
 986         unsigned long now = jiffies;
 987
 988         write_lock(&idev->lock);
 989         if (ift) {
 990                 spin_lock_bh(&ift->lock);
 991                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
 992                 spin_unlock_bh(&ift->lock);
 993                 tmpaddr = &addr;
 994         } else {
 995                 tmpaddr = NULL;
 996         }
 997 retry:
 998         in6_dev_hold(idev);
 999         if (idev->cnf.use_tempaddr <= 0) {
1000                 write_unlock(&idev->lock);
1001                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1002                 in6_dev_put(idev);
1003                 ret = -1;
1004                 goto out;
1005         }
1006         spin_lock_bh(&ifp->lock);
1007         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1008                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1009                 spin_unlock_bh(&ifp->lock);
1010                 write_unlock(&idev->lock);
1011                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1012                         __func__);
1013                 in6_dev_put(idev);
1014                 ret = -1;
1015                 goto out;
1016         }
1017         in6_ifa_hold(ifp);
1018         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1019         __ipv6_try_regen_rndid(idev, tmpaddr);
1020         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1021         age = (now - ifp->tstamp) / HZ;
1022         tmp_valid_lft = min_t(__u32,
1023                               ifp->valid_lft,
1024                               idev->cnf.temp_valid_lft + age);
1025         tmp_prefered_lft = min_t(__u32,
1026                                  ifp->prefered_lft,
1027                                  idev->cnf.temp_prefered_lft + age -
1028                                  idev->cnf.max_desync_factor);
1029         tmp_plen = ifp->prefix_len;
1030         max_addresses = idev->cnf.max_addresses;
1031         tmp_tstamp = ifp->tstamp;
1032         spin_unlock_bh(&ifp->lock);
1033
1034         regen_advance = idev->cnf.regen_max_retry *
1035                         idev->cnf.dad_transmits *
1036                         idev->nd_parms->retrans_time / HZ;
1037         write_unlock(&idev->lock);
1038
1039         /* A temporary address is created only if this calculated Preferred
1040          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1041          * an implementation must not create a temporary address with a zero
1042          * Preferred Lifetime.
1043          */
1044         if (tmp_prefered_lft <= regen_advance) {
1045                 in6_ifa_put(ifp);
1046                 in6_dev_put(idev);
1047                 ret = -1;
1048                 goto out;
1049         }
1050
1051         addr_flags = IFA_F_TEMPORARY;
1052         /* set in addrconf_prefix_rcv() */
1053         if (ifp->flags & IFA_F_OPTIMISTIC)
1054                 addr_flags |= IFA_F_OPTIMISTIC;
1055
1056         ift = !max_addresses ||
1057               ipv6_count_addresses(idev) < max_addresses ?
1058                 ipv6_add_addr(idev, &addr, tmp_plen,
1059                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1060                               addr_flags) : NULL;
1061         if (IS_ERR_OR_NULL(ift)) {
1062                 in6_ifa_put(ifp);
1063                 in6_dev_put(idev);
1064                 pr_info("%s: retry temporary address regeneration\n", __func__);
1065                 tmpaddr = &addr;
1066                 write_lock(&idev->lock);
1067                 goto retry;
1068         }
1069
1070         spin_lock_bh(&ift->lock);
1071         ift->ifpub = ifp;
1072         ift->valid_lft = tmp_valid_lft;
1073         ift->prefered_lft = tmp_prefered_lft;
1074         ift->cstamp = now;
1075         ift->tstamp = tmp_tstamp;
1076         spin_unlock_bh(&ift->lock);
1077
1078         addrconf_dad_start(ift);
1079         in6_ifa_put(ift);
1080         in6_dev_put(idev);
1081 out:
1082         return ret;
1083 }
1084 #endif
1085
1086 /*
1087  *      Choose an appropriate source address (RFC3484)
1088  */
1089 enum {
1090         IPV6_SADDR_RULE_INIT = 0,
1091         IPV6_SADDR_RULE_LOCAL,
1092         IPV6_SADDR_RULE_SCOPE,
1093         IPV6_SADDR_RULE_PREFERRED,
1094 #ifdef CONFIG_IPV6_MIP6
1095         IPV6_SADDR_RULE_HOA,
1096 #endif
1097         IPV6_SADDR_RULE_OIF,
1098         IPV6_SADDR_RULE_LABEL,
1099 #ifdef CONFIG_IPV6_PRIVACY
1100         IPV6_SADDR_RULE_PRIVACY,
1101 #endif
1102         IPV6_SADDR_RULE_ORCHID,
1103         IPV6_SADDR_RULE_PREFIX,
1104         IPV6_SADDR_RULE_MAX
1105 };
1106
1107 struct ipv6_saddr_score {
1108         int                     rule;
1109         int                     addr_type;
1110         struct inet6_ifaddr     *ifa;
1111         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1112         int                     scopedist;
1113         int                     matchlen;
1114 };
1115
1116 struct ipv6_saddr_dst {
1117         const struct in6_addr *addr;
1118         int ifindex;
1119         int scope;
1120         int label;
1121         unsigned int prefs;
1122 };
1123
1124 static inline int ipv6_saddr_preferred(int type)
1125 {
1126         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1127                 return 1;
1128         return 0;
1129 }
1130
1131 static int ipv6_get_saddr_eval(struct net *net,
1132                                struct ipv6_saddr_score *score,
1133                                struct ipv6_saddr_dst *dst,
1134                                int i)
1135 {
1136         int ret;
1137
1138         if (i <= score->rule) {
1139                 switch (i) {
1140                 case IPV6_SADDR_RULE_SCOPE:
1141                         ret = score->scopedist;
1142                         break;
1143                 case IPV6_SADDR_RULE_PREFIX:
1144                         ret = score->matchlen;
1145                         break;
1146                 default:
1147                         ret = !!test_bit(i, score->scorebits);
1148                 }
1149                 goto out;
1150         }
1151
1152         switch (i) {
1153         case IPV6_SADDR_RULE_INIT:
1154                 /* Rule 0: remember if hiscore is not ready yet */
1155                 ret = !!score->ifa;
1156                 break;
1157         case IPV6_SADDR_RULE_LOCAL:
1158                 /* Rule 1: Prefer same address */
1159                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1160                 break;
1161         case IPV6_SADDR_RULE_SCOPE:
1162                 /* Rule 2: Prefer appropriate scope
1163                  *
1164                  *      ret
1165                  *       ^
1166                  *    -1 |  d 15
1167                  *    ---+--+-+---> scope
1168                  *       |
1169                  *       |             d is scope of the destination.
1170                  *  B-d  |  \
1171                  *       |   \      <- smaller scope is better if
1172                  *  B-15 |    \        if scope is enough for destinaion.
1173                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1174                  * d-C-1 | /
1175                  *       |/         <- greater is better
1176                  *   -C  /             if scope is not enough for destination.
1177                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1178                  *
1179                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1180                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1181                  * Assume B = 0 and we get C > 29.
1182                  */
1183                 ret = __ipv6_addr_src_scope(score->addr_type);
1184                 if (ret >= dst->scope)
1185                         ret = -ret;
1186                 else
1187                         ret -= 128;     /* 30 is enough */
1188                 score->scopedist = ret;
1189                 break;
1190         case IPV6_SADDR_RULE_PREFERRED:
1191                 /* Rule 3: Avoid deprecated and optimistic addresses */
1192                 ret = ipv6_saddr_preferred(score->addr_type) ||
1193                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1194                 break;
1195 #ifdef CONFIG_IPV6_MIP6
1196         case IPV6_SADDR_RULE_HOA:
1197             {
1198                 /* Rule 4: Prefer home address */
1199                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1200                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1201                 break;
1202             }
1203 #endif
1204         case IPV6_SADDR_RULE_OIF:
1205                 /* Rule 5: Prefer outgoing interface */
1206                 ret = (!dst->ifindex ||
1207                        dst->ifindex == score->ifa->idev->dev->ifindex);
1208                 break;
1209         case IPV6_SADDR_RULE_LABEL:
1210                 /* Rule 6: Prefer matching label */
1211                 ret = ipv6_addr_label(net,
1212                                       &score->ifa->addr, score->addr_type,
1213                                       score->ifa->idev->dev->ifindex) == dst->label;
1214                 break;
1215 #ifdef CONFIG_IPV6_PRIVACY
1216         case IPV6_SADDR_RULE_PRIVACY:
1217             {
1218                 /* Rule 7: Prefer public address
1219                  * Note: prefer temporary address if use_tempaddr >= 2
1220                  */
1221                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1222                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1223                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1224                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1225                 break;
1226             }
1227 #endif
1228         case IPV6_SADDR_RULE_ORCHID:
1229                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1230                  *          non-ORCHID vs non-ORCHID
1231                  */
1232                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1233                         ipv6_addr_orchid(dst->addr));
1234                 break;
1235         case IPV6_SADDR_RULE_PREFIX:
1236                 /* Rule 8: Use longest matching prefix */
1237                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1238                 if (ret > score->ifa->prefix_len)
1239                         ret = score->ifa->prefix_len;
1240                 score->matchlen = ret;
1241                 break;
1242         default:
1243                 ret = 0;
1244         }
1245
1246         if (ret)
1247                 __set_bit(i, score->scorebits);
1248         score->rule = i;
1249 out:
1250         return ret;
1251 }
1252
1253 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1254                        const struct in6_addr *daddr, unsigned int prefs,
1255                        struct in6_addr *saddr)
1256 {
1257         struct ipv6_saddr_score scores[2],
1258                                 *score = &scores[0], *hiscore = &scores[1];
1259         struct ipv6_saddr_dst dst;
1260         struct net_device *dev;
1261         int dst_type;
1262
1263         dst_type = __ipv6_addr_type(daddr);
1264         dst.addr = daddr;
1265         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1266         dst.scope = __ipv6_addr_src_scope(dst_type);
1267         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1268         dst.prefs = prefs;
1269
1270         hiscore->rule = -1;
1271         hiscore->ifa = NULL;
1272
1273         rcu_read_lock();
1274
1275         for_each_netdev_rcu(net, dev) {
1276                 struct inet6_dev *idev;
1277
1278                 /* Candidate Source Address (section 4)
1279                  *  - multicast and link-local destination address,
1280                  *    the set of candidate source address MUST only
1281                  *    include addresses assigned to interfaces
1282                  *    belonging to the same link as the outgoing
1283                  *    interface.
1284                  * (- For site-local destination addresses, the
1285                  *    set of candidate source addresses MUST only
1286                  *    include addresses assigned to interfaces
1287                  *    belonging to the same site as the outgoing
1288                  *    interface.)
1289                  */
1290                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1291                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1292                     dst.ifindex && dev->ifindex != dst.ifindex)
1293                         continue;
1294
1295                 idev = __in6_dev_get(dev);
1296                 if (!idev)
1297                         continue;
1298
1299                 read_lock_bh(&idev->lock);
1300                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1301                         int i;
1302
1303                         /*
1304                          * - Tentative Address (RFC2462 section 5.4)
1305                          *  - A tentative address is not considered
1306                          *    "assigned to an interface" in the traditional
1307                          *    sense, unless it is also flagged as optimistic.
1308                          * - Candidate Source Address (section 4)
1309                          *  - In any case, anycast addresses, multicast
1310                          *    addresses, and the unspecified address MUST
1311                          *    NOT be included in a candidate set.
1312                          */
1313                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1314                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1315                                 continue;
1316
1317                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1318
1319                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1320                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1321                                 LIMIT_NETDEBUG(KERN_DEBUG
1322                                                "ADDRCONF: unspecified / multicast address "
1323                                                "assigned as unicast address on %s",
1324                                                dev->name);
1325                                 continue;
1326                         }
1327
1328                         score->rule = -1;
1329                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1330
1331                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1332                                 int minihiscore, miniscore;
1333
1334                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1335                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1336
1337                                 if (minihiscore > miniscore) {
1338                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1339                                             score->scopedist > 0) {
1340                                                 /*
1341                                                  * special case:
1342                                                  * each remaining entry
1343                                                  * has too small (not enough)
1344                                                  * scope, because ifa entries
1345                                                  * are sorted by their scope
1346                                                  * values.
1347                                                  */
1348                                                 goto try_nextdev;
1349                                         }
1350                                         break;
1351                                 } else if (minihiscore < miniscore) {
1352                                         if (hiscore->ifa)
1353                                                 in6_ifa_put(hiscore->ifa);
1354
1355                                         in6_ifa_hold(score->ifa);
1356
1357                                         swap(hiscore, score);
1358
1359                                         /* restore our iterator */
1360                                         score->ifa = hiscore->ifa;
1361
1362                                         break;
1363                                 }
1364                         }
1365                 }
1366 try_nextdev:
1367                 read_unlock_bh(&idev->lock);
1368         }
1369         rcu_read_unlock();
1370
1371         if (!hiscore->ifa)
1372                 return -EADDRNOTAVAIL;
1373
1374         *saddr = hiscore->ifa->addr;
1375         in6_ifa_put(hiscore->ifa);
1376         return 0;
1377 }
1378 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1379
1380 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1381                     unsigned char banned_flags)
1382 {
1383         struct inet6_dev *idev;
1384         int err = -EADDRNOTAVAIL;
1385
1386         rcu_read_lock();
1387         idev = __in6_dev_get(dev);
1388         if (idev) {
1389                 struct inet6_ifaddr *ifp;
1390
1391                 read_lock_bh(&idev->lock);
1392                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1393                         if (ifp->scope == IFA_LINK &&
1394                             !(ifp->flags & banned_flags)) {
1395                                 *addr = ifp->addr;
1396                                 err = 0;
1397                                 break;
1398                         }
1399                 }
1400                 read_unlock_bh(&idev->lock);
1401         }
1402         rcu_read_unlock();
1403         return err;
1404 }
1405
1406 static int ipv6_count_addresses(struct inet6_dev *idev)
1407 {
1408         int cnt = 0;
1409         struct inet6_ifaddr *ifp;
1410
1411         read_lock_bh(&idev->lock);
1412         list_for_each_entry(ifp, &idev->addr_list, if_list)
1413                 cnt++;
1414         read_unlock_bh(&idev->lock);
1415         return cnt;
1416 }
1417
1418 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1419                   struct net_device *dev, int strict)
1420 {
1421         struct inet6_ifaddr *ifp;
1422         unsigned int hash = inet6_addr_hash(addr);
1423
1424         rcu_read_lock_bh();
1425         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1426                 if (!net_eq(dev_net(ifp->idev->dev), net))
1427                         continue;
1428                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1429                     !(ifp->flags&IFA_F_TENTATIVE) &&
1430                     (dev == NULL || ifp->idev->dev == dev ||
1431                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1432                         rcu_read_unlock_bh();
1433                         return 1;
1434                 }
1435         }
1436
1437         rcu_read_unlock_bh();
1438         return 0;
1439 }
1440 EXPORT_SYMBOL(ipv6_chk_addr);
1441
1442 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1443                                struct net_device *dev)
1444 {
1445         unsigned int hash = inet6_addr_hash(addr);
1446         struct inet6_ifaddr *ifp;
1447
1448         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1449                 if (!net_eq(dev_net(ifp->idev->dev), net))
1450                         continue;
1451                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1452                         if (dev == NULL || ifp->idev->dev == dev)
1453                                 return true;
1454                 }
1455         }
1456         return false;
1457 }
1458
1459 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1460 {
1461         struct inet6_dev *idev;
1462         struct inet6_ifaddr *ifa;
1463         int     onlink;
1464
1465         onlink = 0;
1466         rcu_read_lock();
1467         idev = __in6_dev_get(dev);
1468         if (idev) {
1469                 read_lock_bh(&idev->lock);
1470                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1471                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1472                                                    ifa->prefix_len);
1473                         if (onlink)
1474                                 break;
1475                 }
1476                 read_unlock_bh(&idev->lock);
1477         }
1478         rcu_read_unlock();
1479         return onlink;
1480 }
1481 EXPORT_SYMBOL(ipv6_chk_prefix);
1482
1483 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1484                                      struct net_device *dev, int strict)
1485 {
1486         struct inet6_ifaddr *ifp, *result = NULL;
1487         unsigned int hash = inet6_addr_hash(addr);
1488
1489         rcu_read_lock_bh();
1490         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1491                 if (!net_eq(dev_net(ifp->idev->dev), net))
1492                         continue;
1493                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1494                         if (dev == NULL || ifp->idev->dev == dev ||
1495                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1496                                 result = ifp;
1497                                 in6_ifa_hold(ifp);
1498                                 break;
1499                         }
1500                 }
1501         }
1502         rcu_read_unlock_bh();
1503
1504         return result;
1505 }
1506
1507 /* Gets referenced address, destroys ifaddr */
1508
1509 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1510 {
1511         if (ifp->flags&IFA_F_PERMANENT) {
1512                 spin_lock_bh(&ifp->lock);
1513                 addrconf_del_timer(ifp);
1514                 ifp->flags |= IFA_F_TENTATIVE;
1515                 if (dad_failed)
1516                         ifp->flags |= IFA_F_DADFAILED;
1517                 spin_unlock_bh(&ifp->lock);
1518                 if (dad_failed)
1519                         ipv6_ifa_notify(0, ifp);
1520                 in6_ifa_put(ifp);
1521 #ifdef CONFIG_IPV6_PRIVACY
1522         } else if (ifp->flags&IFA_F_TEMPORARY) {
1523                 struct inet6_ifaddr *ifpub;
1524                 spin_lock_bh(&ifp->lock);
1525                 ifpub = ifp->ifpub;
1526                 if (ifpub) {
1527                         in6_ifa_hold(ifpub);
1528                         spin_unlock_bh(&ifp->lock);
1529                         ipv6_create_tempaddr(ifpub, ifp);
1530                         in6_ifa_put(ifpub);
1531                 } else {
1532                         spin_unlock_bh(&ifp->lock);
1533                 }
1534                 ipv6_del_addr(ifp);
1535 #endif
1536         } else
1537                 ipv6_del_addr(ifp);
1538 }
1539
1540 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1541 {
1542         int err = -ENOENT;
1543
1544         spin_lock(&ifp->state_lock);
1545         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1546                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1547                 err = 0;
1548         }
1549         spin_unlock(&ifp->state_lock);
1550
1551         return err;
1552 }
1553
1554 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1555 {
1556         struct inet6_dev *idev = ifp->idev;
1557
1558         if (addrconf_dad_end(ifp)) {
1559                 in6_ifa_put(ifp);
1560                 return;
1561         }
1562
1563         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1564                              ifp->idev->dev->name, &ifp->addr);
1565
1566         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1567                 struct in6_addr addr;
1568
1569                 addr.s6_addr32[0] = htonl(0xfe800000);
1570                 addr.s6_addr32[1] = 0;
1571
1572                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1573                     ipv6_addr_equal(&ifp->addr, &addr)) {
1574                         /* DAD failed for link-local based on MAC address */
1575                         idev->cnf.disable_ipv6 = 1;
1576
1577                         pr_info("%s: IPv6 being disabled!\n",
1578                                 ifp->idev->dev->name);
1579                 }
1580         }
1581
1582         addrconf_dad_stop(ifp, 1);
1583 }
1584
1585 /* Join to solicited addr multicast group. */
1586
1587 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1588 {
1589         struct in6_addr maddr;
1590
1591         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1592                 return;
1593
1594         addrconf_addr_solict_mult(addr, &maddr);
1595         ipv6_dev_mc_inc(dev, &maddr);
1596 }
1597
1598 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1599 {
1600         struct in6_addr maddr;
1601
1602         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1603                 return;
1604
1605         addrconf_addr_solict_mult(addr, &maddr);
1606         __ipv6_dev_mc_dec(idev, &maddr);
1607 }
1608
1609 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1610 {
1611         struct in6_addr addr;
1612         if (ifp->prefix_len == 127) /* RFC 6164 */
1613                 return;
1614         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1615         if (ipv6_addr_any(&addr))
1616                 return;
1617         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1618 }
1619
1620 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1621 {
1622         struct in6_addr addr;
1623         if (ifp->prefix_len == 127) /* RFC 6164 */
1624                 return;
1625         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1626         if (ipv6_addr_any(&addr))
1627                 return;
1628         __ipv6_dev_ac_dec(ifp->idev, &addr);
1629 }
1630
1631 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1632 {
1633         if (dev->addr_len != ETH_ALEN)
1634                 return -1;
1635         memcpy(eui, dev->dev_addr, 3);
1636         memcpy(eui + 5, dev->dev_addr + 3, 3);
1637
1638         /*
1639          * The zSeries OSA network cards can be shared among various
1640          * OS instances, but the OSA cards have only one MAC address.
1641          * This leads to duplicate address conflicts in conjunction
1642          * with IPv6 if more than one instance uses the same card.
1643          *
1644          * The driver for these cards can deliver a unique 16-bit
1645          * identifier for each instance sharing the same card.  It is
1646          * placed instead of 0xFFFE in the interface identifier.  The
1647          * "u" bit of the interface identifier is not inverted in this
1648          * case.  Hence the resulting interface identifier has local
1649          * scope according to RFC2373.
1650          */
1651         if (dev->dev_id) {
1652                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1653                 eui[4] = dev->dev_id & 0xFF;
1654         } else {
1655                 eui[3] = 0xFF;
1656                 eui[4] = 0xFE;
1657                 eui[0] ^= 2;
1658         }
1659         return 0;
1660 }
1661
1662 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1663 {
1664         if (dev->addr_len != IEEE802154_ADDR_LEN)
1665                 return -1;
1666         memcpy(eui, dev->dev_addr, 8);
1667         eui[0] ^= 2;
1668         return 0;
1669 }
1670
1671 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1672 {
1673         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1674         if (dev->addr_len != ARCNET_ALEN)
1675                 return -1;
1676         memset(eui, 0, 7);
1677         eui[7] = *(u8 *)dev->dev_addr;
1678         return 0;
1679 }
1680
1681 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1682 {
1683         if (dev->addr_len != INFINIBAND_ALEN)
1684                 return -1;
1685         memcpy(eui, dev->dev_addr + 12, 8);
1686         eui[0] |= 2;
1687         return 0;
1688 }
1689
1690 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1691 {
1692         if (addr == 0)
1693                 return -1;
1694         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1695                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1696                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1697                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1698                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1699                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1700         eui[1] = 0;
1701         eui[2] = 0x5E;
1702         eui[3] = 0xFE;
1703         memcpy(eui + 4, &addr, 4);
1704         return 0;
1705 }
1706
1707 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1708 {
1709         if (dev->priv_flags & IFF_ISATAP)
1710                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1711         return -1;
1712 }
1713
1714 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1715 {
1716         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1717 }
1718
1719 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1720 {
1721         switch (dev->type) {
1722         case ARPHRD_ETHER:
1723         case ARPHRD_FDDI:
1724                 return addrconf_ifid_eui48(eui, dev);
1725         case ARPHRD_ARCNET:
1726                 return addrconf_ifid_arcnet(eui, dev);
1727         case ARPHRD_INFINIBAND:
1728                 return addrconf_ifid_infiniband(eui, dev);
1729         case ARPHRD_SIT:
1730                 return addrconf_ifid_sit(eui, dev);
1731         case ARPHRD_IPGRE:
1732                 return addrconf_ifid_gre(eui, dev);
1733         case ARPHRD_IEEE802154:
1734                 return addrconf_ifid_eui64(eui, dev);
1735         }
1736         return -1;
1737 }
1738
1739 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1740 {
1741         int err = -1;
1742         struct inet6_ifaddr *ifp;
1743
1744         read_lock_bh(&idev->lock);
1745         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1746                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1747                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1748                         err = 0;
1749                         break;
1750                 }
1751         }
1752         read_unlock_bh(&idev->lock);
1753         return err;
1754 }
1755
1756 #ifdef CONFIG_IPV6_PRIVACY
1757 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1758 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1759 {
1760 regen:
1761         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1762         idev->rndid[0] &= ~0x02;
1763
1764         /*
1765          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1766          * check if generated address is not inappropriate
1767          *
1768          *  - Reserved subnet anycast (RFC 2526)
1769          *      11111101 11....11 1xxxxxxx
1770          *  - ISATAP (RFC4214) 6.1
1771          *      00-00-5E-FE-xx-xx-xx-xx
1772          *  - value 0
1773          *  - XXX: already assigned to an address on the device
1774          */
1775         if (idev->rndid[0] == 0xfd &&
1776             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1777             (idev->rndid[7]&0x80))
1778                 goto regen;
1779         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1780                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1781                         goto regen;
1782                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1783                         goto regen;
1784         }
1785 }
1786
1787 static void ipv6_regen_rndid(unsigned long data)
1788 {
1789         struct inet6_dev *idev = (struct inet6_dev *) data;
1790         unsigned long expires;
1791
1792         rcu_read_lock_bh();
1793         write_lock_bh(&idev->lock);
1794
1795         if (idev->dead)
1796                 goto out;
1797
1798         __ipv6_regen_rndid(idev);
1799
1800         expires = jiffies +
1801                 idev->cnf.temp_prefered_lft * HZ -
1802                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1803                 idev->cnf.max_desync_factor * HZ;
1804         if (time_before(expires, jiffies)) {
1805                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1806                         __func__, idev->dev->name);
1807                 goto out;
1808         }
1809
1810         if (!mod_timer(&idev->regen_timer, expires))
1811                 in6_dev_hold(idev);
1812
1813 out:
1814         write_unlock_bh(&idev->lock);
1815         rcu_read_unlock_bh();
1816         in6_dev_put(idev);
1817 }
1818
1819 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1820 {
1821         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1822                 __ipv6_regen_rndid(idev);
1823 }
1824 #endif
1825
1826 /*
1827  *      Add prefix route.
1828  */
1829
1830 static void
1831 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1832                       unsigned long expires, u32 flags)
1833 {
1834         struct fib6_config cfg = {
1835                 .fc_table = RT6_TABLE_PREFIX,
1836                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1837                 .fc_ifindex = dev->ifindex,
1838                 .fc_expires = expires,
1839                 .fc_dst_len = plen,
1840                 .fc_flags = RTF_UP | flags,
1841                 .fc_nlinfo.nl_net = dev_net(dev),
1842                 .fc_protocol = RTPROT_KERNEL,
1843         };
1844
1845         cfg.fc_dst = *pfx;
1846
1847         /* Prevent useless cloning on PtP SIT.
1848            This thing is done here expecting that the whole
1849            class of non-broadcast devices need not cloning.
1850          */
1851 #if IS_ENABLED(CONFIG_IPV6_SIT)
1852         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1853                 cfg.fc_flags |= RTF_NONEXTHOP;
1854 #endif
1855
1856         ip6_route_add(&cfg);
1857 }
1858
1859
1860 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1861                                                   int plen,
1862                                                   const struct net_device *dev,
1863                                                   u32 flags, u32 noflags)
1864 {
1865         struct fib6_node *fn;
1866         struct rt6_info *rt = NULL;
1867         struct fib6_table *table;
1868
1869         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1870         if (table == NULL)
1871                 return NULL;
1872
1873         read_lock_bh(&table->tb6_lock);
1874         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1875         if (!fn)
1876                 goto out;
1877         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1878                 if (rt->dst.dev->ifindex != dev->ifindex)
1879                         continue;
1880                 if ((rt->rt6i_flags & flags) != flags)
1881                         continue;
1882                 if ((rt->rt6i_flags & noflags) != 0)
1883                         continue;
1884                 dst_hold(&rt->dst);
1885                 break;
1886         }
1887 out:
1888         read_unlock_bh(&table->tb6_lock);
1889         return rt;
1890 }
1891
1892
1893 /* Create "default" multicast route to the interface */
1894
1895 static void addrconf_add_mroute(struct net_device *dev)
1896 {
1897         struct fib6_config cfg = {
1898                 .fc_table = RT6_TABLE_LOCAL,
1899                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1900                 .fc_ifindex = dev->ifindex,
1901                 .fc_dst_len = 8,
1902                 .fc_flags = RTF_UP,
1903                 .fc_nlinfo.nl_net = dev_net(dev),
1904         };
1905
1906         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1907
1908         ip6_route_add(&cfg);
1909 }
1910
1911 #if IS_ENABLED(CONFIG_IPV6_SIT)
1912 static void sit_route_add(struct net_device *dev)
1913 {
1914         struct fib6_config cfg = {
1915                 .fc_table = RT6_TABLE_MAIN,
1916                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1917                 .fc_ifindex = dev->ifindex,
1918                 .fc_dst_len = 96,
1919                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1920                 .fc_nlinfo.nl_net = dev_net(dev),
1921         };
1922
1923         /* prefix length - 96 bits "::d.d.d.d" */
1924         ip6_route_add(&cfg);
1925 }
1926 #endif
1927
1928 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1929 {
1930         struct inet6_dev *idev;
1931
1932         ASSERT_RTNL();
1933
1934         idev = ipv6_find_idev(dev);
1935         if (!idev)
1936                 return ERR_PTR(-ENOBUFS);
1937
1938         if (idev->cnf.disable_ipv6)
1939                 return ERR_PTR(-EACCES);
1940
1941         /* Add default multicast route */
1942         if (!(dev->flags & IFF_LOOPBACK))
1943                 addrconf_add_mroute(dev);
1944
1945         return idev;
1946 }
1947
1948 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1949 {
1950         struct prefix_info *pinfo;
1951         __u32 valid_lft;
1952         __u32 prefered_lft;
1953         int addr_type;
1954         struct inet6_dev *in6_dev;
1955         struct net *net = dev_net(dev);
1956
1957         pinfo = (struct prefix_info *) opt;
1958
1959         if (len < sizeof(struct prefix_info)) {
1960                 ADBG(("addrconf: prefix option too short\n"));
1961                 return;
1962         }
1963
1964         /*
1965          *      Validation checks ([ADDRCONF], page 19)
1966          */
1967
1968         addr_type = ipv6_addr_type(&pinfo->prefix);
1969
1970         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1971                 return;
1972
1973         valid_lft = ntohl(pinfo->valid);
1974         prefered_lft = ntohl(pinfo->prefered);
1975
1976         if (prefered_lft > valid_lft) {
1977                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1978                 return;
1979         }
1980
1981         in6_dev = in6_dev_get(dev);
1982
1983         if (in6_dev == NULL) {
1984                 net_dbg_ratelimited("addrconf: device %s not configured\n",
1985                                     dev->name);
1986                 return;
1987         }
1988
1989         /*
1990          *      Two things going on here:
1991          *      1) Add routes for on-link prefixes
1992          *      2) Configure prefixes with the auto flag set
1993          */
1994
1995         if (pinfo->onlink) {
1996                 struct rt6_info *rt;
1997                 unsigned long rt_expires;
1998
1999                 /* Avoid arithmetic overflow. Really, we could
2000                  * save rt_expires in seconds, likely valid_lft,
2001                  * but it would require division in fib gc, that it
2002                  * not good.
2003                  */
2004                 if (HZ > USER_HZ)
2005                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2006                 else
2007                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2008
2009                 if (addrconf_finite_timeout(rt_expires))
2010                         rt_expires *= HZ;
2011
2012                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2013                                                pinfo->prefix_len,
2014                                                dev,
2015                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2016                                                RTF_GATEWAY | RTF_DEFAULT);
2017
2018                 if (rt) {
2019                         /* Autoconf prefix route */
2020                         if (valid_lft == 0) {
2021                                 ip6_del_rt(rt);
2022                                 rt = NULL;
2023                         } else if (addrconf_finite_timeout(rt_expires)) {
2024                                 /* not infinity */
2025                                 rt6_set_expires(rt, jiffies + rt_expires);
2026                         } else {
2027                                 rt6_clean_expires(rt);
2028                         }
2029                 } else if (valid_lft) {
2030                         clock_t expires = 0;
2031                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2032                         if (addrconf_finite_timeout(rt_expires)) {
2033                                 /* not infinity */
2034                                 flags |= RTF_EXPIRES;
2035                                 expires = jiffies_to_clock_t(rt_expires);
2036                         }
2037                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2038                                               dev, expires, flags);
2039                 }
2040                 ip6_rt_put(rt);
2041         }
2042
2043         /* Try to figure out our local address for this prefix */
2044
2045         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2046                 struct inet6_ifaddr *ifp;
2047                 struct in6_addr addr;
2048                 int create = 0, update_lft = 0;
2049
2050                 if (pinfo->prefix_len == 64) {
2051                         memcpy(&addr, &pinfo->prefix, 8);
2052                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2053                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2054                                 in6_dev_put(in6_dev);
2055                                 return;
2056                         }
2057                         goto ok;
2058                 }
2059                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2060                                     pinfo->prefix_len);
2061                 in6_dev_put(in6_dev);
2062                 return;
2063
2064 ok:
2065
2066                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2067
2068                 if (ifp == NULL && valid_lft) {
2069                         int max_addresses = in6_dev->cnf.max_addresses;
2070                         u32 addr_flags = 0;
2071
2072 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2073                         if (in6_dev->cnf.optimistic_dad &&
2074                             !net->ipv6.devconf_all->forwarding && sllao)
2075                                 addr_flags = IFA_F_OPTIMISTIC;
2076 #endif
2077
2078                         /* Do not allow to create too much of autoconfigured
2079                          * addresses; this would be too easy way to crash kernel.
2080                          */
2081                         if (!max_addresses ||
2082                             ipv6_count_addresses(in6_dev) < max_addresses)
2083                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2084                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2085                                                     addr_flags);
2086
2087                         if (IS_ERR_OR_NULL(ifp)) {
2088                                 in6_dev_put(in6_dev);
2089                                 return;
2090                         }
2091
2092                         update_lft = create = 1;
2093                         ifp->cstamp = jiffies;
2094                         addrconf_dad_start(ifp);
2095                 }
2096
2097                 if (ifp) {
2098                         int flags;
2099                         unsigned long now;
2100 #ifdef CONFIG_IPV6_PRIVACY
2101                         struct inet6_ifaddr *ift;
2102 #endif
2103                         u32 stored_lft;
2104
2105                         /* update lifetime (RFC2462 5.5.3 e) */
2106                         spin_lock(&ifp->lock);
2107                         now = jiffies;
2108                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2109                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2110                         else
2111                                 stored_lft = 0;
2112                         if (!update_lft && stored_lft) {
2113                                 if (valid_lft > MIN_VALID_LIFETIME ||
2114                                     valid_lft > stored_lft)
2115                                         update_lft = 1;
2116                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
2117                                         /* valid_lft <= stored_lft is always true */
2118                                         /*
2119                                          * RFC 4862 Section 5.5.3e:
2120                                          * "Note that the preferred lifetime of
2121                                          *  the corresponding address is always
2122                                          *  reset to the Preferred Lifetime in
2123                                          *  the received Prefix Information
2124                                          *  option, regardless of whether the
2125                                          *  valid lifetime is also reset or
2126                                          *  ignored."
2127                                          *
2128                                          *  So if the preferred lifetime in
2129                                          *  this advertisement is different
2130                                          *  than what we have stored, but the
2131                                          *  valid lifetime is invalid, just
2132                                          *  reset prefered_lft.
2133                                          *
2134                                          *  We must set the valid lifetime
2135                                          *  to the stored lifetime since we'll
2136                                          *  be updating the timestamp below,
2137                                          *  else we'll set it back to the
2138                                          *  minimum.
2139                                          */
2140                                         if (prefered_lft != ifp->prefered_lft) {
2141                                                 valid_lft = stored_lft;
2142                                                 update_lft = 1;
2143                                         }
2144                                 } else {
2145                                         valid_lft = MIN_VALID_LIFETIME;
2146                                         if (valid_lft < prefered_lft)
2147                                                 prefered_lft = valid_lft;
2148                                         update_lft = 1;
2149                                 }
2150                         }
2151
2152                         if (update_lft) {
2153                                 ifp->valid_lft = valid_lft;
2154                                 ifp->prefered_lft = prefered_lft;
2155                                 ifp->tstamp = now;
2156                                 flags = ifp->flags;
2157                                 ifp->flags &= ~IFA_F_DEPRECATED;
2158                                 spin_unlock(&ifp->lock);
2159
2160                                 if (!(flags&IFA_F_TENTATIVE))
2161                                         ipv6_ifa_notify(0, ifp);
2162                         } else
2163                                 spin_unlock(&ifp->lock);
2164
2165 #ifdef CONFIG_IPV6_PRIVACY
2166                         read_lock_bh(&in6_dev->lock);
2167                         /* update all temporary addresses in the list */
2168                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2169                                             tmp_list) {
2170                                 int age, max_valid, max_prefered;
2171
2172                                 if (ifp != ift->ifpub)
2173                                         continue;
2174
2175                                 /*
2176                                  * RFC 4941 section 3.3:
2177                                  * If a received option will extend the lifetime
2178                                  * of a public address, the lifetimes of
2179                                  * temporary addresses should be extended,
2180                                  * subject to the overall constraint that no
2181                                  * temporary addresses should ever remain
2182                                  * "valid" or "preferred" for a time longer than
2183                                  * (TEMP_VALID_LIFETIME) or
2184                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2185                                  * respectively.
2186                                  */
2187                                 age = (now - ift->cstamp) / HZ;
2188                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2189                                 if (max_valid < 0)
2190                                         max_valid = 0;
2191
2192                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2193                                                in6_dev->cnf.max_desync_factor -
2194                                                age;
2195                                 if (max_prefered < 0)
2196                                         max_prefered = 0;
2197
2198                                 if (valid_lft > max_valid)
2199                                         valid_lft = max_valid;
2200
2201                                 if (prefered_lft > max_prefered)
2202                                         prefered_lft = max_prefered;
2203
2204                                 spin_lock(&ift->lock);
2205                                 flags = ift->flags;
2206                                 ift->valid_lft = valid_lft;
2207                                 ift->prefered_lft = prefered_lft;
2208                                 ift->tstamp = now;
2209                                 if (prefered_lft > 0)
2210                                         ift->flags &= ~IFA_F_DEPRECATED;
2211
2212                                 spin_unlock(&ift->lock);
2213                                 if (!(flags&IFA_F_TENTATIVE))
2214                                         ipv6_ifa_notify(0, ift);
2215                         }
2216
2217                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2218                                 /*
2219                                  * When a new public address is created as
2220                                  * described in [ADDRCONF], also create a new
2221                                  * temporary address. Also create a temporary
2222                                  * address if it's enabled but no temporary
2223                                  * address currently exists.
2224                                  */
2225                                 read_unlock_bh(&in6_dev->lock);
2226                                 ipv6_create_tempaddr(ifp, NULL);
2227                         } else {
2228                                 read_unlock_bh(&in6_dev->lock);
2229                         }
2230 #endif
2231                         in6_ifa_put(ifp);
2232                         addrconf_verify(0);
2233                 }
2234         }
2235         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2236         in6_dev_put(in6_dev);
2237 }
2238
2239 /*
2240  *      Set destination address.
2241  *      Special case for SIT interfaces where we create a new "virtual"
2242  *      device.
2243  */
2244 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2245 {
2246         struct in6_ifreq ireq;
2247         struct net_device *dev;
2248         int err = -EINVAL;
2249
2250         rtnl_lock();
2251
2252         err = -EFAULT;
2253         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2254                 goto err_exit;
2255
2256         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2257
2258         err = -ENODEV;
2259         if (dev == NULL)
2260                 goto err_exit;
2261
2262 #if IS_ENABLED(CONFIG_IPV6_SIT)
2263         if (dev->type == ARPHRD_SIT) {
2264                 const struct net_device_ops *ops = dev->netdev_ops;
2265                 struct ifreq ifr;
2266                 struct ip_tunnel_parm p;
2267
2268                 err = -EADDRNOTAVAIL;
2269                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2270                         goto err_exit;
2271
2272                 memset(&p, 0, sizeof(p));
2273                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2274                 p.iph.saddr = 0;
2275                 p.iph.version = 4;
2276                 p.iph.ihl = 5;
2277                 p.iph.protocol = IPPROTO_IPV6;
2278                 p.iph.ttl = 64;
2279                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2280
2281                 if (ops->ndo_do_ioctl) {
2282                         mm_segment_t oldfs = get_fs();
2283
2284                         set_fs(KERNEL_DS);
2285                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2286                         set_fs(oldfs);
2287                 } else
2288                         err = -EOPNOTSUPP;
2289
2290                 if (err == 0) {
2291                         err = -ENOBUFS;
2292                         dev = __dev_get_by_name(net, p.name);
2293                         if (!dev)
2294                                 goto err_exit;
2295                         err = dev_open(dev);
2296                 }
2297         }
2298 #endif
2299
2300 err_exit:
2301         rtnl_unlock();
2302         return err;
2303 }
2304
2305 /*
2306  *      Manual configuration of address on an interface
2307  */
2308 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2309                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2310                           __u32 valid_lft)
2311 {
2312         struct inet6_ifaddr *ifp;
2313         struct inet6_dev *idev;
2314         struct net_device *dev;
2315         int scope;
2316         u32 flags;
2317         clock_t expires;
2318         unsigned long timeout;
2319
2320         ASSERT_RTNL();
2321
2322         if (plen > 128)
2323                 return -EINVAL;
2324
2325         /* check the lifetime */
2326         if (!valid_lft || prefered_lft > valid_lft)
2327                 return -EINVAL;
2328
2329         dev = __dev_get_by_index(net, ifindex);
2330         if (!dev)
2331                 return -ENODEV;
2332
2333         idev = addrconf_add_dev(dev);
2334         if (IS_ERR(idev))
2335                 return PTR_ERR(idev);
2336
2337         scope = ipv6_addr_scope(pfx);
2338
2339         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2340         if (addrconf_finite_timeout(timeout)) {
2341                 expires = jiffies_to_clock_t(timeout * HZ);
2342                 valid_lft = timeout;
2343                 flags = RTF_EXPIRES;
2344         } else {
2345                 expires = 0;
2346                 flags = 0;
2347                 ifa_flags |= IFA_F_PERMANENT;
2348         }
2349
2350         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2351         if (addrconf_finite_timeout(timeout)) {
2352                 if (timeout == 0)
2353                         ifa_flags |= IFA_F_DEPRECATED;
2354                 prefered_lft = timeout;
2355         }
2356
2357         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2358
2359         if (!IS_ERR(ifp)) {
2360                 spin_lock_bh(&ifp->lock);
2361                 ifp->valid_lft = valid_lft;
2362                 ifp->prefered_lft = prefered_lft;
2363                 ifp->tstamp = jiffies;
2364                 spin_unlock_bh(&ifp->lock);
2365
2366                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2367                                       expires, flags);
2368                 /*
2369                  * Note that section 3.1 of RFC 4429 indicates
2370                  * that the Optimistic flag should not be set for
2371                  * manually configured addresses
2372                  */
2373                 addrconf_dad_start(ifp);
2374                 in6_ifa_put(ifp);
2375                 addrconf_verify(0);
2376                 return 0;
2377         }
2378
2379         return PTR_ERR(ifp);
2380 }
2381
2382 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2383                           unsigned int plen)
2384 {
2385         struct inet6_ifaddr *ifp;
2386         struct inet6_dev *idev;
2387         struct net_device *dev;
2388
2389         if (plen > 128)
2390                 return -EINVAL;
2391
2392         dev = __dev_get_by_index(net, ifindex);
2393         if (!dev)
2394                 return -ENODEV;
2395
2396         if ((idev = __in6_dev_get(dev)) == NULL)
2397                 return -ENXIO;
2398
2399         read_lock_bh(&idev->lock);
2400         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2401                 if (ifp->prefix_len == plen &&
2402                     ipv6_addr_equal(pfx, &ifp->addr)) {
2403                         in6_ifa_hold(ifp);
2404                         read_unlock_bh(&idev->lock);
2405
2406                         ipv6_del_addr(ifp);
2407
2408                         /* If the last address is deleted administratively,
2409                            disable IPv6 on this interface.
2410                          */
2411                         if (list_empty(&idev->addr_list))
2412                                 addrconf_ifdown(idev->dev, 1);
2413                         return 0;
2414                 }
2415         }
2416         read_unlock_bh(&idev->lock);
2417         return -EADDRNOTAVAIL;
2418 }
2419
2420
2421 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2422 {
2423         struct in6_ifreq ireq;
2424         int err;
2425
2426         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2427                 return -EPERM;
2428
2429         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2430                 return -EFAULT;
2431
2432         rtnl_lock();
2433         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2434                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2435                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2436         rtnl_unlock();
2437         return err;
2438 }
2439
2440 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2441 {
2442         struct in6_ifreq ireq;
2443         int err;
2444
2445         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2446                 return -EPERM;
2447
2448         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2449                 return -EFAULT;
2450
2451         rtnl_lock();
2452         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2453                              ireq.ifr6_prefixlen);
2454         rtnl_unlock();
2455         return err;
2456 }
2457
2458 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2459                      int plen, int scope)
2460 {
2461         struct inet6_ifaddr *ifp;
2462
2463         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2464         if (!IS_ERR(ifp)) {
2465                 spin_lock_bh(&ifp->lock);
2466                 ifp->flags &= ~IFA_F_TENTATIVE;
2467                 spin_unlock_bh(&ifp->lock);
2468                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2469                 in6_ifa_put(ifp);
2470         }
2471 }
2472
2473 #if IS_ENABLED(CONFIG_IPV6_SIT)
2474 static void sit_add_v4_addrs(struct inet6_dev *idev)
2475 {
2476         struct in6_addr addr;
2477         struct net_device *dev;
2478         struct net *net = dev_net(idev->dev);
2479         int scope;
2480
2481         ASSERT_RTNL();
2482
2483         memset(&addr, 0, sizeof(struct in6_addr));
2484         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2485
2486         if (idev->dev->flags&IFF_POINTOPOINT) {
2487                 addr.s6_addr32[0] = htonl(0xfe800000);
2488                 scope = IFA_LINK;
2489         } else {
2490                 scope = IPV6_ADDR_COMPATv4;
2491         }
2492
2493         if (addr.s6_addr32[3]) {
2494                 add_addr(idev, &addr, 128, scope);
2495                 return;
2496         }
2497
2498         for_each_netdev(net, dev) {
2499                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2500                 if (in_dev && (dev->flags & IFF_UP)) {
2501                         struct in_ifaddr *ifa;
2502
2503                         int flag = scope;
2504
2505                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2506                                 int plen;
2507
2508                                 addr.s6_addr32[3] = ifa->ifa_local;
2509
2510                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2511                                         continue;
2512                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2513                                         if (idev->dev->flags&IFF_POINTOPOINT)
2514                                                 continue;
2515                                         flag |= IFA_HOST;
2516                                 }
2517                                 if (idev->dev->flags&IFF_POINTOPOINT)
2518                                         plen = 64;
2519                                 else
2520                                         plen = 96;
2521
2522                                 add_addr(idev, &addr, plen, flag);
2523                         }
2524                 }
2525         }
2526 }
2527 #endif
2528
2529 static void init_loopback(struct net_device *dev)
2530 {
2531         struct inet6_dev  *idev;
2532
2533         /* ::1 */
2534
2535         ASSERT_RTNL();
2536
2537         if ((idev = ipv6_find_idev(dev)) == NULL) {
2538                 pr_debug("%s: add_dev failed\n", __func__);
2539                 return;
2540         }
2541
2542         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2543 }
2544
2545 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2546 {
2547         struct inet6_ifaddr *ifp;
2548         u32 addr_flags = IFA_F_PERMANENT;
2549
2550 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2551         if (idev->cnf.optimistic_dad &&
2552             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2553                 addr_flags |= IFA_F_OPTIMISTIC;
2554 #endif
2555
2556
2557         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2558         if (!IS_ERR(ifp)) {
2559                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2560                 addrconf_dad_start(ifp);
2561                 in6_ifa_put(ifp);
2562         }
2563 }
2564
2565 static void addrconf_dev_config(struct net_device *dev)
2566 {
2567         struct in6_addr addr;
2568         struct inet6_dev *idev;
2569
2570         ASSERT_RTNL();
2571
2572         if ((dev->type != ARPHRD_ETHER) &&
2573             (dev->type != ARPHRD_FDDI) &&
2574             (dev->type != ARPHRD_ARCNET) &&
2575             (dev->type != ARPHRD_INFINIBAND) &&
2576             (dev->type != ARPHRD_IEEE802154)) {
2577                 /* Alas, we support only Ethernet autoconfiguration. */
2578                 return;
2579         }
2580
2581         idev = addrconf_add_dev(dev);
2582         if (IS_ERR(idev))
2583                 return;
2584
2585         memset(&addr, 0, sizeof(struct in6_addr));
2586         addr.s6_addr32[0] = htonl(0xFE800000);
2587
2588         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2589                 addrconf_add_linklocal(idev, &addr);
2590 }
2591
2592 #if IS_ENABLED(CONFIG_IPV6_SIT)
2593 static void addrconf_sit_config(struct net_device *dev)
2594 {
2595         struct inet6_dev *idev;
2596
2597         ASSERT_RTNL();
2598
2599         /*
2600          * Configure the tunnel with one of our IPv4
2601          * addresses... we should configure all of
2602          * our v4 addrs in the tunnel
2603          */
2604
2605         if ((idev = ipv6_find_idev(dev)) == NULL) {
2606                 pr_debug("%s: add_dev failed\n", __func__);
2607                 return;
2608         }
2609
2610         if (dev->priv_flags & IFF_ISATAP) {
2611                 struct in6_addr addr;
2612
2613                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2614                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2615                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2616                         addrconf_add_linklocal(idev, &addr);
2617                 return;
2618         }
2619
2620         sit_add_v4_addrs(idev);
2621
2622         if (dev->flags&IFF_POINTOPOINT)
2623                 addrconf_add_mroute(dev);
2624         else
2625                 sit_route_add(dev);
2626 }
2627 #endif
2628
2629 #if IS_ENABLED(CONFIG_NET_IPGRE)
2630 static void addrconf_gre_config(struct net_device *dev)
2631 {
2632         struct inet6_dev *idev;
2633         struct in6_addr addr;
2634
2635         pr_info("%s(%s)\n", __func__, dev->name);
2636
2637         ASSERT_RTNL();
2638
2639         if ((idev = ipv6_find_idev(dev)) == NULL) {
2640                 pr_debug("%s: add_dev failed\n", __func__);
2641                 return;
2642         }
2643
2644         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2645         addrconf_prefix_route(&addr, 64, dev, 0, 0);
2646
2647         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2648                 addrconf_add_linklocal(idev, &addr);
2649 }
2650 #endif
2651
2652 static inline int
2653 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2654 {
2655         struct in6_addr lladdr;
2656
2657         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2658                 addrconf_add_linklocal(idev, &lladdr);
2659                 return 0;
2660         }
2661         return -1;
2662 }
2663
2664 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2665 {
2666         struct net_device *link_dev;
2667         struct net *net = dev_net(idev->dev);
2668
2669         /* first try to inherit the link-local address from the link device */
2670         if (idev->dev->iflink &&
2671             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2672                 if (!ipv6_inherit_linklocal(idev, link_dev))
2673                         return;
2674         }
2675         /* then try to inherit it from any device */
2676         for_each_netdev(net, link_dev) {
2677                 if (!ipv6_inherit_linklocal(idev, link_dev))
2678                         return;
2679         }
2680         pr_debug("init ip6-ip6: add_linklocal failed\n");
2681 }
2682
2683 /*
2684  * Autoconfigure tunnel with a link-local address so routing protocols,
2685  * DHCPv6, MLD etc. can be run over the virtual link
2686  */
2687
2688 static void addrconf_ip6_tnl_config(struct net_device *dev)
2689 {
2690         struct inet6_dev *idev;
2691
2692         ASSERT_RTNL();
2693
2694         idev = addrconf_add_dev(dev);
2695         if (IS_ERR(idev)) {
2696                 pr_debug("init ip6-ip6: add_dev failed\n");
2697                 return;
2698         }
2699         ip6_tnl_add_linklocal(idev);
2700 }
2701
2702 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2703                            void *data)
2704 {
2705         struct net_device *dev = (struct net_device *) data;
2706         struct inet6_dev *idev = __in6_dev_get(dev);
2707         int run_pending = 0;
2708         int err;
2709
2710         switch (event) {
2711         case NETDEV_REGISTER:
2712                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2713                         idev = ipv6_add_dev(dev);
2714                         if (!idev)
2715                                 return notifier_from_errno(-ENOMEM);
2716                 }
2717                 break;
2718
2719         case NETDEV_UP:
2720         case NETDEV_CHANGE:
2721                 if (dev->flags & IFF_SLAVE)
2722                         break;
2723
2724                 if (event == NETDEV_UP) {
2725                         if (!addrconf_qdisc_ok(dev)) {
2726                                 /* device is not ready yet. */
2727                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2728                                         dev->name);
2729                                 break;
2730                         }
2731
2732                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2733                                 idev = ipv6_add_dev(dev);
2734
2735                         if (idev) {
2736                                 idev->if_flags |= IF_READY;
2737                                 run_pending = 1;
2738                         }
2739                 } else {
2740                         if (!addrconf_qdisc_ok(dev)) {
2741                                 /* device is still not ready. */
2742                                 break;
2743                         }
2744
2745                         if (idev) {
2746                                 if (idev->if_flags & IF_READY)
2747                                         /* device is already configured. */
2748                                         break;
2749                                 idev->if_flags |= IF_READY;
2750                         }
2751
2752                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2753                                 dev->name);
2754
2755                         run_pending = 1;
2756                 }
2757
2758                 switch (dev->type) {
2759 #if IS_ENABLED(CONFIG_IPV6_SIT)
2760                 case ARPHRD_SIT:
2761                         addrconf_sit_config(dev);
2762                         break;
2763 #endif
2764 #if IS_ENABLED(CONFIG_NET_IPGRE)
2765                 case ARPHRD_IPGRE:
2766                         addrconf_gre_config(dev);
2767                         break;
2768 #endif
2769                 case ARPHRD_TUNNEL6:
2770                         addrconf_ip6_tnl_config(dev);
2771                         break;
2772                 case ARPHRD_LOOPBACK:
2773                         init_loopback(dev);
2774                         break;
2775
2776                 default:
2777                         addrconf_dev_config(dev);
2778                         break;
2779                 }
2780
2781                 if (idev) {
2782                         if (run_pending)
2783                                 addrconf_dad_run(idev);
2784
2785                         /*
2786                          * If the MTU changed during the interface down,
2787                          * when the interface up, the changed MTU must be
2788                          * reflected in the idev as well as routers.
2789                          */
2790                         if (idev->cnf.mtu6 != dev->mtu &&
2791                             dev->mtu >= IPV6_MIN_MTU) {
2792                                 rt6_mtu_change(dev, dev->mtu);
2793                                 idev->cnf.mtu6 = dev->mtu;
2794                         }
2795                         idev->tstamp = jiffies;
2796                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2797
2798                         /*
2799                          * If the changed mtu during down is lower than
2800                          * IPV6_MIN_MTU stop IPv6 on this interface.
2801                          */
2802                         if (dev->mtu < IPV6_MIN_MTU)
2803                                 addrconf_ifdown(dev, 1);
2804                 }
2805                 break;
2806
2807         case NETDEV_CHANGEMTU:
2808                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2809                         rt6_mtu_change(dev, dev->mtu);
2810                         idev->cnf.mtu6 = dev->mtu;
2811                         break;
2812                 }
2813
2814                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2815                         idev = ipv6_add_dev(dev);
2816                         if (idev)
2817                                 break;
2818                 }
2819
2820                 /*
2821                  * MTU falled under IPV6_MIN_MTU.
2822                  * Stop IPv6 on this interface.
2823                  */
2824
2825         case NETDEV_DOWN:
2826         case NETDEV_UNREGISTER:
2827                 /*
2828                  *      Remove all addresses from this interface.
2829                  */
2830                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2831                 break;
2832
2833         case NETDEV_CHANGENAME:
2834                 if (idev) {
2835                         snmp6_unregister_dev(idev);
2836                         addrconf_sysctl_unregister(idev);
2837                         addrconf_sysctl_register(idev);
2838                         err = snmp6_register_dev(idev);
2839                         if (err)
2840                                 return notifier_from_errno(err);
2841                 }
2842                 break;
2843
2844         case NETDEV_PRE_TYPE_CHANGE:
2845         case NETDEV_POST_TYPE_CHANGE:
2846                 addrconf_type_change(dev, event);
2847                 break;
2848         }
2849
2850         return NOTIFY_OK;
2851 }
2852
2853 /*
2854  *      addrconf module should be notified of a device going up
2855  */
2856 static struct notifier_block ipv6_dev_notf = {
2857         .notifier_call = addrconf_notify,
2858 };
2859
2860 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2861 {
2862         struct inet6_dev *idev;
2863         ASSERT_RTNL();
2864
2865         idev = __in6_dev_get(dev);
2866
2867         if (event == NETDEV_POST_TYPE_CHANGE)
2868                 ipv6_mc_remap(idev);
2869         else if (event == NETDEV_PRE_TYPE_CHANGE)
2870                 ipv6_mc_unmap(idev);
2871 }
2872
2873 static int addrconf_ifdown(struct net_device *dev, int how)
2874 {
2875         struct net *net = dev_net(dev);
2876         struct inet6_dev *idev;
2877         struct inet6_ifaddr *ifa;
2878         int state, i;
2879
2880         ASSERT_RTNL();
2881
2882         rt6_ifdown(net, dev);
2883         neigh_ifdown(&nd_tbl, dev);
2884
2885         idev = __in6_dev_get(dev);
2886         if (idev == NULL)
2887                 return -ENODEV;
2888
2889         /*
2890          * Step 1: remove reference to ipv6 device from parent device.
2891          *         Do not dev_put!
2892          */
2893         if (how) {
2894                 idev->dead = 1;
2895
2896                 /* protected by rtnl_lock */
2897                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2898
2899                 /* Step 1.5: remove snmp6 entry */
2900                 snmp6_unregister_dev(idev);
2901
2902         }
2903
2904         /* Step 2: clear hash table */
2905         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2906                 struct hlist_head *h = &inet6_addr_lst[i];
2907
2908                 spin_lock_bh(&addrconf_hash_lock);
2909         restart:
2910                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2911                         if (ifa->idev == idev) {
2912                                 hlist_del_init_rcu(&ifa->addr_lst);
2913                                 addrconf_del_timer(ifa);
2914                                 goto restart;
2915                         }
2916                 }
2917                 spin_unlock_bh(&addrconf_hash_lock);
2918         }
2919
2920         write_lock_bh(&idev->lock);
2921
2922         /* Step 2: clear flags for stateless addrconf */
2923         if (!how)
2924                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2925
2926 #ifdef CONFIG_IPV6_PRIVACY
2927         if (how && del_timer(&idev->regen_timer))
2928                 in6_dev_put(idev);
2929
2930         /* Step 3: clear tempaddr list */
2931         while (!list_empty(&idev->tempaddr_list)) {
2932                 ifa = list_first_entry(&idev->tempaddr_list,
2933                                        struct inet6_ifaddr, tmp_list);
2934                 list_del(&ifa->tmp_list);
2935                 write_unlock_bh(&idev->lock);
2936                 spin_lock_bh(&ifa->lock);
2937
2938                 if (ifa->ifpub) {
2939                         in6_ifa_put(ifa->ifpub);
2940                         ifa->ifpub = NULL;
2941                 }
2942                 spin_unlock_bh(&ifa->lock);
2943                 in6_ifa_put(ifa);
2944                 write_lock_bh(&idev->lock);
2945         }
2946 #endif
2947
2948         while (!list_empty(&idev->addr_list)) {
2949                 ifa = list_first_entry(&idev->addr_list,
2950                                        struct inet6_ifaddr, if_list);
2951                 addrconf_del_timer(ifa);
2952
2953                 list_del(&ifa->if_list);
2954
2955                 write_unlock_bh(&idev->lock);
2956
2957                 spin_lock_bh(&ifa->state_lock);
2958                 state = ifa->state;
2959                 ifa->state = INET6_IFADDR_STATE_DEAD;
2960                 spin_unlock_bh(&ifa->state_lock);
2961
2962                 if (state != INET6_IFADDR_STATE_DEAD) {
2963                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
2964                         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2965                 }
2966                 in6_ifa_put(ifa);
2967
2968                 write_lock_bh(&idev->lock);
2969         }
2970
2971         write_unlock_bh(&idev->lock);
2972
2973         /* Step 5: Discard multicast list */
2974         if (how)
2975                 ipv6_mc_destroy_dev(idev);
2976         else
2977                 ipv6_mc_down(idev);
2978
2979         idev->tstamp = jiffies;
2980
2981         /* Last: Shot the device (if unregistered) */
2982         if (how) {
2983                 addrconf_sysctl_unregister(idev);
2984                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2985                 neigh_ifdown(&nd_tbl, dev);
2986                 in6_dev_put(idev);
2987         }
2988         return 0;
2989 }
2990
2991 static void addrconf_rs_timer(unsigned long data)
2992 {
2993         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2994         struct inet6_dev *idev = ifp->idev;
2995
2996         read_lock(&idev->lock);
2997         if (idev->dead || !(idev->if_flags & IF_READY))
2998                 goto out;
2999
3000         if (!ipv6_accept_ra(idev))
3001                 goto out;
3002
3003         /* Announcement received after solicitation was sent */
3004         if (idev->if_flags & IF_RA_RCVD)
3005                 goto out;
3006
3007         spin_lock(&ifp->lock);
3008         if (ifp->probes++ < idev->cnf.rtr_solicits) {
3009                 /* The wait after the last probe can be shorter */
3010                 addrconf_mod_timer(ifp, AC_RS,
3011                                    (ifp->probes == idev->cnf.rtr_solicits) ?
3012                                    idev->cnf.rtr_solicit_delay :
3013                                    idev->cnf.rtr_solicit_interval);
3014                 spin_unlock(&ifp->lock);
3015
3016                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3017         } else {
3018                 spin_unlock(&ifp->lock);
3019                 /*
3020                  * Note: we do not support deprecated "all on-link"
3021                  * assumption any longer.
3022                  */
3023                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3024         }
3025
3026 out:
3027         read_unlock(&idev->lock);
3028         in6_ifa_put(ifp);
3029 }
3030
3031 /*
3032  *      Duplicate Address Detection
3033  */
3034 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3035 {
3036         unsigned long rand_num;
3037         struct inet6_dev *idev = ifp->idev;
3038
3039         if (ifp->flags & IFA_F_OPTIMISTIC)
3040                 rand_num = 0;
3041         else
3042                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3043
3044         ifp->probes = idev->cnf.dad_transmits;
3045         addrconf_mod_timer(ifp, AC_DAD, rand_num);
3046 }
3047
3048 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3049 {
3050         struct inet6_dev *idev = ifp->idev;
3051         struct net_device *dev = idev->dev;
3052
3053         addrconf_join_solict(dev, &ifp->addr);
3054
3055         net_srandom(ifp->addr.s6_addr32[3]);
3056
3057         read_lock_bh(&idev->lock);
3058         spin_lock(&ifp->lock);
3059         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3060                 goto out;
3061
3062         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3063             idev->cnf.accept_dad < 1 ||
3064             !(ifp->flags&IFA_F_TENTATIVE) ||
3065             ifp->flags & IFA_F_NODAD) {
3066                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3067                 spin_unlock(&ifp->lock);
3068                 read_unlock_bh(&idev->lock);
3069
3070                 addrconf_dad_completed(ifp);
3071                 return;
3072         }
3073
3074         if (!(idev->if_flags & IF_READY)) {
3075                 spin_unlock(&ifp->lock);
3076                 read_unlock_bh(&idev->lock);
3077                 /*
3078                  * If the device is not ready:
3079                  * - keep it tentative if it is a permanent address.
3080                  * - otherwise, kill it.
3081                  */
3082                 in6_ifa_hold(ifp);
3083                 addrconf_dad_stop(ifp, 0);
3084                 return;
3085         }
3086
3087         /*
3088          * Optimistic nodes can start receiving
3089          * Frames right away
3090          */
3091         if (ifp->flags & IFA_F_OPTIMISTIC)
3092                 ip6_ins_rt(ifp->rt);
3093
3094         addrconf_dad_kick(ifp);
3095 out:
3096         spin_unlock(&ifp->lock);
3097         read_unlock_bh(&idev->lock);
3098 }
3099
3100 static void addrconf_dad_timer(unsigned long data)
3101 {
3102         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3103         struct inet6_dev *idev = ifp->idev;
3104         struct in6_addr mcaddr;
3105
3106         if (!ifp->probes && addrconf_dad_end(ifp))
3107                 goto out;
3108
3109         read_lock(&idev->lock);
3110         if (idev->dead || !(idev->if_flags & IF_READY)) {
3111                 read_unlock(&idev->lock);
3112                 goto out;
3113         }
3114
3115         spin_lock(&ifp->lock);
3116         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3117                 spin_unlock(&ifp->lock);
3118                 read_unlock(&idev->lock);
3119                 goto out;
3120         }
3121
3122         if (ifp->probes == 0) {
3123                 /*
3124                  * DAD was successful
3125                  */
3126
3127                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3128                 spin_unlock(&ifp->lock);
3129                 read_unlock(&idev->lock);
3130
3131                 addrconf_dad_completed(ifp);
3132
3133                 goto out;
3134         }
3135
3136         ifp->probes--;
3137         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3138         spin_unlock(&ifp->lock);
3139         read_unlock(&idev->lock);
3140
3141         /* send a neighbour solicitation for our addr */
3142         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3143         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3144 out:
3145         in6_ifa_put(ifp);
3146 }
3147
3148 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3149 {
3150         struct net_device *dev = ifp->idev->dev;
3151
3152         /*
3153          *      Configure the address for reception. Now it is valid.
3154          */
3155
3156         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3157
3158         /* If added prefix is link local and we are prepared to process
3159            router advertisements, start sending router solicitations.
3160          */
3161
3162         if (ipv6_accept_ra(ifp->idev) &&
3163             ifp->idev->cnf.rtr_solicits > 0 &&
3164             (dev->flags&IFF_LOOPBACK) == 0 &&
3165             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3166                 /*
3167                  *      If a host as already performed a random delay
3168                  *      [...] as part of DAD [...] there is no need
3169                  *      to delay again before sending the first RS
3170                  */
3171                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3172
3173                 spin_lock_bh(&ifp->lock);
3174                 ifp->probes = 1;
3175                 ifp->idev->if_flags |= IF_RS_SENT;
3176                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3177                 spin_unlock_bh(&ifp->lock);
3178         }
3179 }
3180
3181 static void addrconf_dad_run(struct inet6_dev *idev)
3182 {
3183         struct inet6_ifaddr *ifp;
3184
3185         read_lock_bh(&idev->lock);
3186         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3187                 spin_lock(&ifp->lock);
3188                 if (ifp->flags & IFA_F_TENTATIVE &&
3189                     ifp->state == INET6_IFADDR_STATE_DAD)
3190                         addrconf_dad_kick(ifp);
3191                 spin_unlock(&ifp->lock);
3192         }
3193         read_unlock_bh(&idev->lock);
3194 }
3195
3196 #ifdef CONFIG_PROC_FS
3197 struct if6_iter_state {
3198         struct seq_net_private p;
3199         int bucket;
3200         int offset;
3201 };
3202
3203 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3204 {
3205         struct inet6_ifaddr *ifa = NULL;
3206         struct if6_iter_state *state = seq->private;
3207         struct net *net = seq_file_net(seq);
3208         int p = 0;
3209
3210         /* initial bucket if pos is 0 */
3211         if (pos == 0) {
3212                 state->bucket = 0;
3213                 state->offset = 0;
3214         }
3215
3216         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3217                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3218                                          addr_lst) {
3219                         if (!net_eq(dev_net(ifa->idev->dev), net))
3220                                 continue;
3221                         /* sync with offset */
3222                         if (p < state->offset) {
3223                                 p++;
3224                                 continue;
3225                         }
3226                         state->offset++;
3227                         return ifa;
3228                 }
3229
3230                 /* prepare for next bucket */
3231                 state->offset = 0;
3232                 p = 0;
3233         }
3234         return NULL;
3235 }
3236
3237 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3238                                          struct inet6_ifaddr *ifa)
3239 {
3240         struct if6_iter_state *state = seq->private;
3241         struct net *net = seq_file_net(seq);
3242
3243         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3244                 if (!net_eq(dev_net(ifa->idev->dev), net))
3245                         continue;
3246                 state->offset++;
3247                 return ifa;
3248         }
3249
3250         while (++state->bucket < IN6_ADDR_HSIZE) {
3251                 state->offset = 0;
3252                 hlist_for_each_entry_rcu_bh(ifa,
3253                                      &inet6_addr_lst[state->bucket], addr_lst) {
3254                         if (!net_eq(dev_net(ifa->idev->dev), net))
3255                                 continue;
3256                         state->offset++;
3257                         return ifa;
3258                 }
3259         }
3260
3261         return NULL;
3262 }
3263
3264 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3265         __acquires(rcu_bh)
3266 {
3267         rcu_read_lock_bh();
3268         return if6_get_first(seq, *pos);
3269 }
3270
3271 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3272 {
3273         struct inet6_ifaddr *ifa;
3274
3275         ifa = if6_get_next(seq, v);
3276         ++*pos;
3277         return ifa;
3278 }
3279
3280 static void if6_seq_stop(struct seq_file *seq, void *v)
3281         __releases(rcu_bh)
3282 {
3283         rcu_read_unlock_bh();
3284 }
3285
3286 static int if6_seq_show(struct seq_file *seq, void *v)
3287 {
3288         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3289         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3290                    &ifp->addr,
3291                    ifp->idev->dev->ifindex,
3292                    ifp->prefix_len,
3293                    ifp->scope,
3294                    ifp->flags,
3295                    ifp->idev->dev->name);
3296         return 0;
3297 }
3298
3299 static const struct seq_operations if6_seq_ops = {
3300         .start  = if6_seq_start,
3301         .next   = if6_seq_next,
3302         .show   = if6_seq_show,
3303         .stop   = if6_seq_stop,
3304 };
3305
3306 static int if6_seq_open(struct inode *inode, struct file *file)
3307 {
3308         return seq_open_net(inode, file, &if6_seq_ops,
3309                             sizeof(struct if6_iter_state));
3310 }
3311
3312 static const struct file_operations if6_fops = {
3313         .owner          = THIS_MODULE,
3314         .open           = if6_seq_open,
3315         .read           = seq_read,
3316         .llseek         = seq_lseek,
3317         .release        = seq_release_net,
3318 };
3319
3320 static int __net_init if6_proc_net_init(struct net *net)
3321 {
3322         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3323                 return -ENOMEM;
3324         return 0;
3325 }
3326
3327 static void __net_exit if6_proc_net_exit(struct net *net)
3328 {
3329         remove_proc_entry("if_inet6", net->proc_net);
3330 }
3331
3332 static struct pernet_operations if6_proc_net_ops = {
3333        .init = if6_proc_net_init,
3334        .exit = if6_proc_net_exit,
3335 };
3336
3337 int __init if6_proc_init(void)
3338 {
3339         return register_pernet_subsys(&if6_proc_net_ops);
3340 }
3341
3342 void if6_proc_exit(void)
3343 {
3344         unregister_pernet_subsys(&if6_proc_net_ops);
3345 }
3346 #endif  /* CONFIG_PROC_FS */
3347
3348 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3349 /* Check if address is a home address configured on any interface. */
3350 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3351 {
3352         int ret = 0;
3353         struct inet6_ifaddr *ifp = NULL;
3354         unsigned int hash = inet6_addr_hash(addr);
3355
3356         rcu_read_lock_bh();
3357         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3358                 if (!net_eq(dev_net(ifp->idev->dev), net))
3359                         continue;
3360                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3361                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3362                         ret = 1;
3363                         break;
3364                 }
3365         }
3366         rcu_read_unlock_bh();
3367         return ret;
3368 }
3369 #endif
3370
3371 /*
3372  *      Periodic address status verification
3373  */
3374
3375 static void addrconf_verify(unsigned long foo)
3376 {
3377         unsigned long now, next, next_sec, next_sched;
3378         struct inet6_ifaddr *ifp;
3379         int i;
3380
3381         rcu_read_lock_bh();
3382         spin_lock(&addrconf_verify_lock);
3383         now = jiffies;
3384         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3385
3386         del_timer(&addr_chk_timer);
3387
3388         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3389 restart:
3390                 hlist_for_each_entry_rcu_bh(ifp,
3391                                          &inet6_addr_lst[i], addr_lst) {
3392                         unsigned long age;
3393
3394                         if (ifp->flags & IFA_F_PERMANENT)
3395                                 continue;
3396
3397                         spin_lock(&ifp->lock);
3398                         /* We try to batch several events at once. */
3399                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3400
3401                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3402                             age >= ifp->valid_lft) {
3403                                 spin_unlock(&ifp->lock);
3404                                 in6_ifa_hold(ifp);
3405                                 ipv6_del_addr(ifp);
3406                                 goto restart;
3407                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3408                                 spin_unlock(&ifp->lock);
3409                                 continue;
3410                         } else if (age >= ifp->prefered_lft) {
3411                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3412                                 int deprecate = 0;
3413
3414                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3415                                         deprecate = 1;
3416                                         ifp->flags |= IFA_F_DEPRECATED;
3417                                 }
3418
3419                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3420                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3421
3422                                 spin_unlock(&ifp->lock);
3423
3424                                 if (deprecate) {
3425                                         in6_ifa_hold(ifp);
3426
3427                                         ipv6_ifa_notify(0, ifp);
3428                                         in6_ifa_put(ifp);
3429                                         goto restart;
3430                                 }
3431 #ifdef CONFIG_IPV6_PRIVACY
3432                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3433                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3434                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3435                                         ifp->idev->cnf.dad_transmits *
3436                                         ifp->idev->nd_parms->retrans_time / HZ;
3437
3438                                 if (age >= ifp->prefered_lft - regen_advance) {
3439                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3440                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3441                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3442                                         if (!ifp->regen_count && ifpub) {
3443                                                 ifp->regen_count++;
3444                                                 in6_ifa_hold(ifp);
3445                                                 in6_ifa_hold(ifpub);
3446                                                 spin_unlock(&ifp->lock);
3447
3448                                                 spin_lock(&ifpub->lock);
3449                                                 ifpub->regen_count = 0;
3450                                                 spin_unlock(&ifpub->lock);
3451                                                 ipv6_create_tempaddr(ifpub, ifp);
3452                                                 in6_ifa_put(ifpub);
3453                                                 in6_ifa_put(ifp);
3454                                                 goto restart;
3455                                         }
3456                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3457                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3458                                 spin_unlock(&ifp->lock);
3459 #endif
3460                         } else {
3461                                 /* ifp->prefered_lft <= ifp->valid_lft */
3462                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3463                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3464                                 spin_unlock(&ifp->lock);
3465                         }
3466                 }
3467         }
3468
3469         next_sec = round_jiffies_up(next);
3470         next_sched = next;
3471
3472         /* If rounded timeout is accurate enough, accept it. */
3473         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3474                 next_sched = next_sec;
3475
3476         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3477         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3478                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3479
3480         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3481               now, next, next_sec, next_sched));
3482
3483         addr_chk_timer.expires = next_sched;
3484         add_timer(&addr_chk_timer);
3485         spin_unlock(&addrconf_verify_lock);
3486         rcu_read_unlock_bh();
3487 }
3488
3489 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3490 {
3491         struct in6_addr *pfx = NULL;
3492
3493         if (addr)
3494                 pfx = nla_data(addr);
3495
3496         if (local) {
3497                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3498                         pfx = NULL;
3499                 else
3500                         pfx = nla_data(local);
3501         }
3502
3503         return pfx;
3504 }
3505
3506 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3507         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3508         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3509         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3510 };
3511
3512 static int
3513 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3514 {
3515         struct net *net = sock_net(skb->sk);
3516         struct ifaddrmsg *ifm;
3517         struct nlattr *tb[IFA_MAX+1];
3518         struct in6_addr *pfx;
3519         int err;
3520
3521         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3522         if (err < 0)
3523                 return err;
3524
3525         ifm = nlmsg_data(nlh);
3526         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3527         if (pfx == NULL)
3528                 return -EINVAL;
3529
3530         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3531 }
3532
3533 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3534                              u32 prefered_lft, u32 valid_lft)
3535 {
3536         u32 flags;
3537         clock_t expires;
3538         unsigned long timeout;
3539
3540         if (!valid_lft || (prefered_lft > valid_lft))
3541                 return -EINVAL;
3542
3543         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3544         if (addrconf_finite_timeout(timeout)) {
3545                 expires = jiffies_to_clock_t(timeout * HZ);
3546                 valid_lft = timeout;
3547                 flags = RTF_EXPIRES;
3548         } else {
3549                 expires = 0;
3550                 flags = 0;
3551                 ifa_flags |= IFA_F_PERMANENT;
3552         }
3553
3554         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3555         if (addrconf_finite_timeout(timeout)) {
3556                 if (timeout == 0)
3557                         ifa_flags |= IFA_F_DEPRECATED;
3558                 prefered_lft = timeout;
3559         }
3560
3561         spin_lock_bh(&ifp->lock);
3562         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3563         ifp->tstamp = jiffies;
3564         ifp->valid_lft = valid_lft;
3565         ifp->prefered_lft = prefered_lft;
3566
3567         spin_unlock_bh(&ifp->lock);
3568         if (!(ifp->flags&IFA_F_TENTATIVE))
3569                 ipv6_ifa_notify(0, ifp);
3570
3571         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3572                               expires, flags);
3573         addrconf_verify(0);
3574
3575         return 0;
3576 }
3577
3578 static int
3579 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3580 {
3581         struct net *net = sock_net(skb->sk);
3582         struct ifaddrmsg *ifm;
3583         struct nlattr *tb[IFA_MAX+1];
3584         struct in6_addr *pfx;
3585         struct inet6_ifaddr *ifa;
3586         struct net_device *dev;
3587         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3588         u8 ifa_flags;
3589         int err;
3590
3591         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3592         if (err < 0)
3593                 return err;
3594
3595         ifm = nlmsg_data(nlh);
3596         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3597         if (pfx == NULL)
3598                 return -EINVAL;
3599
3600         if (tb[IFA_CACHEINFO]) {
3601                 struct ifa_cacheinfo *ci;
3602
3603                 ci = nla_data(tb[IFA_CACHEINFO]);
3604                 valid_lft = ci->ifa_valid;
3605                 preferred_lft = ci->ifa_prefered;
3606         } else {
3607                 preferred_lft = INFINITY_LIFE_TIME;
3608                 valid_lft = INFINITY_LIFE_TIME;
3609         }
3610
3611         dev =  __dev_get_by_index(net, ifm->ifa_index);
3612         if (dev == NULL)
3613                 return -ENODEV;
3614
3615         /* We ignore other flags so far. */
3616         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3617
3618         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3619         if (ifa == NULL) {
3620                 /*
3621                  * It would be best to check for !NLM_F_CREATE here but
3622                  * userspace alreay relies on not having to provide this.
3623                  */
3624                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3625                                       ifm->ifa_prefixlen, ifa_flags,
3626                                       preferred_lft, valid_lft);
3627         }
3628
3629         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3630             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3631                 err = -EEXIST;
3632         else
3633                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3634
3635         in6_ifa_put(ifa);
3636
3637         return err;
3638 }
3639
3640 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3641                           u8 scope, int ifindex)
3642 {
3643         struct ifaddrmsg *ifm;
3644
3645         ifm = nlmsg_data(nlh);
3646         ifm->ifa_family = AF_INET6;
3647         ifm->ifa_prefixlen = prefixlen;
3648         ifm->ifa_flags = flags;
3649         ifm->ifa_scope = scope;
3650         ifm->ifa_index = ifindex;
3651 }
3652
3653 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3654                          unsigned long tstamp, u32 preferred, u32 valid)
3655 {
3656         struct ifa_cacheinfo ci;
3657
3658         ci.cstamp = cstamp_delta(cstamp);
3659         ci.tstamp = cstamp_delta(tstamp);
3660         ci.ifa_prefered = preferred;
3661         ci.ifa_valid = valid;
3662
3663         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3664 }
3665
3666 static inline int rt_scope(int ifa_scope)
3667 {
3668         if (ifa_scope & IFA_HOST)
3669                 return RT_SCOPE_HOST;
3670         else if (ifa_scope & IFA_LINK)
3671                 return RT_SCOPE_LINK;
3672         else if (ifa_scope & IFA_SITE)
3673                 return RT_SCOPE_SITE;
3674         else
3675                 return RT_SCOPE_UNIVERSE;
3676 }
3677
3678 static inline int inet6_ifaddr_msgsize(void)
3679 {
3680         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3681                + nla_total_size(16) /* IFA_ADDRESS */
3682                + nla_total_size(sizeof(struct ifa_cacheinfo));
3683 }
3684
3685 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3686                              u32 portid, u32 seq, int event, unsigned int flags)
3687 {
3688         struct nlmsghdr  *nlh;
3689         u32 preferred, valid;
3690
3691         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3692         if (nlh == NULL)
3693                 return -EMSGSIZE;
3694
3695         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3696                       ifa->idev->dev->ifindex);
3697
3698         if (!(ifa->flags&IFA_F_PERMANENT)) {
3699                 preferred = ifa->prefered_lft;
3700                 valid = ifa->valid_lft;
3701                 if (preferred != INFINITY_LIFE_TIME) {
3702                         long tval = (jiffies - ifa->tstamp)/HZ;
3703                         if (preferred > tval)
3704                                 preferred -= tval;
3705                         else
3706                                 preferred = 0;
3707                         if (valid != INFINITY_LIFE_TIME) {
3708                                 if (valid > tval)
3709                                         valid -= tval;
3710                                 else
3711                                         valid = 0;
3712                         }
3713                 }
3714         } else {
3715                 preferred = INFINITY_LIFE_TIME;
3716                 valid = INFINITY_LIFE_TIME;
3717         }
3718
3719         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3720             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3721                 nlmsg_cancel(skb, nlh);
3722                 return -EMSGSIZE;
3723         }
3724
3725         return nlmsg_end(skb, nlh);
3726 }
3727
3728 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3729                                 u32 portid, u32 seq, int event, u16 flags)
3730 {
3731         struct nlmsghdr  *nlh;
3732         u8 scope = RT_SCOPE_UNIVERSE;
3733         int ifindex = ifmca->idev->dev->ifindex;
3734
3735         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3736                 scope = RT_SCOPE_SITE;
3737
3738         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3739         if (nlh == NULL)
3740                 return -EMSGSIZE;
3741
3742         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3743         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3744             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3745                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3746                 nlmsg_cancel(skb, nlh);
3747                 return -EMSGSIZE;
3748         }
3749
3750         return nlmsg_end(skb, nlh);
3751 }
3752
3753 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3754                                 u32 portid, u32 seq, int event, unsigned int flags)
3755 {
3756         struct nlmsghdr  *nlh;
3757         u8 scope = RT_SCOPE_UNIVERSE;
3758         int ifindex = ifaca->aca_idev->dev->ifindex;
3759
3760         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3761                 scope = RT_SCOPE_SITE;
3762
3763         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3764         if (nlh == NULL)
3765                 return -EMSGSIZE;
3766
3767         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3768         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3769             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3770                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3771                 nlmsg_cancel(skb, nlh);
3772                 return -EMSGSIZE;
3773         }
3774
3775         return nlmsg_end(skb, nlh);
3776 }
3777
3778 enum addr_type_t {
3779         UNICAST_ADDR,
3780         MULTICAST_ADDR,
3781         ANYCAST_ADDR,
3782 };
3783
3784 /* called with rcu_read_lock() */
3785 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3786                           struct netlink_callback *cb, enum addr_type_t type,
3787                           int s_ip_idx, int *p_ip_idx)
3788 {
3789         struct ifmcaddr6 *ifmca;
3790         struct ifacaddr6 *ifaca;
3791         int err = 1;
3792         int ip_idx = *p_ip_idx;
3793
3794         read_lock_bh(&idev->lock);
3795         switch (type) {
3796         case UNICAST_ADDR: {
3797                 struct inet6_ifaddr *ifa;
3798
3799                 /* unicast address incl. temp addr */
3800                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3801                         if (++ip_idx < s_ip_idx)
3802                                 continue;
3803                         err = inet6_fill_ifaddr(skb, ifa,
3804                                                 NETLINK_CB(cb->skb).portid,
3805                                                 cb->nlh->nlmsg_seq,
3806                                                 RTM_NEWADDR,
3807                                                 NLM_F_MULTI);
3808                         if (err <= 0)
3809                                 break;
3810                 }
3811                 break;
3812         }
3813         case MULTICAST_ADDR:
3814                 /* multicast address */
3815                 for (ifmca = idev->mc_list; ifmca;
3816                      ifmca = ifmca->next, ip_idx++) {
3817                         if (ip_idx < s_ip_idx)
3818                                 continue;
3819                         err = inet6_fill_ifmcaddr(skb, ifmca,
3820                                                   NETLINK_CB(cb->skb).portid,
3821                                                   cb->nlh->nlmsg_seq,
3822                                                   RTM_GETMULTICAST,
3823                                                   NLM_F_MULTI);
3824                         if (err <= 0)
3825                                 break;
3826                 }
3827                 break;
3828         case ANYCAST_ADDR:
3829                 /* anycast address */
3830                 for (ifaca = idev->ac_list; ifaca;
3831                      ifaca = ifaca->aca_next, ip_idx++) {
3832                         if (ip_idx < s_ip_idx)
3833                                 continue;
3834                         err = inet6_fill_ifacaddr(skb, ifaca,
3835                                                   NETLINK_CB(cb->skb).portid,
3836                                                   cb->nlh->nlmsg_seq,
3837                                                   RTM_GETANYCAST,
3838                                                   NLM_F_MULTI);
3839                         if (err <= 0)
3840                                 break;
3841                 }
3842                 break;
3843         default:
3844                 break;
3845         }
3846         read_unlock_bh(&idev->lock);
3847         *p_ip_idx = ip_idx;
3848         return err;
3849 }
3850
3851 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3852                            enum addr_type_t type)
3853 {
3854         struct net *net = sock_net(skb->sk);
3855         int h, s_h;
3856         int idx, ip_idx;
3857         int s_idx, s_ip_idx;
3858         struct net_device *dev;
3859         struct inet6_dev *idev;
3860         struct hlist_head *head;
3861
3862         s_h = cb->args[0];
3863         s_idx = idx = cb->args[1];
3864         s_ip_idx = ip_idx = cb->args[2];
3865
3866         rcu_read_lock();
3867         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3868                 idx = 0;
3869                 head = &net->dev_index_head[h];
3870                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3871                         if (idx < s_idx)
3872                                 goto cont;
3873                         if (h > s_h || idx > s_idx)
3874                                 s_ip_idx = 0;
3875                         ip_idx = 0;
3876                         idev = __in6_dev_get(dev);
3877                         if (!idev)
3878                                 goto cont;
3879
3880                         if (in6_dump_addrs(idev, skb, cb, type,
3881                                            s_ip_idx, &ip_idx) <= 0)
3882                                 goto done;
3883 cont:
3884                         idx++;
3885                 }
3886         }
3887 done:
3888         rcu_read_unlock();
3889         cb->args[0] = h;
3890         cb->args[1] = idx;
3891         cb->args[2] = ip_idx;
3892
3893         return skb->len;
3894 }
3895
3896 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3897 {
3898         enum addr_type_t type = UNICAST_ADDR;
3899
3900         return inet6_dump_addr(skb, cb, type);
3901 }
3902
3903 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3904 {
3905         enum addr_type_t type = MULTICAST_ADDR;
3906
3907         return inet6_dump_addr(skb, cb, type);
3908 }
3909
3910
3911 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3912 {
3913         enum addr_type_t type = ANYCAST_ADDR;
3914
3915         return inet6_dump_addr(skb, cb, type);
3916 }
3917
3918 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3919                              void *arg)
3920 {
3921         struct net *net = sock_net(in_skb->sk);
3922         struct ifaddrmsg *ifm;
3923         struct nlattr *tb[IFA_MAX+1];
3924         struct in6_addr *addr = NULL;
3925         struct net_device *dev = NULL;
3926         struct inet6_ifaddr *ifa;
3927         struct sk_buff *skb;
3928         int err;
3929
3930         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3931         if (err < 0)
3932                 goto errout;
3933
3934         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3935         if (addr == NULL) {
3936                 err = -EINVAL;
3937                 goto errout;
3938         }
3939
3940         ifm = nlmsg_data(nlh);
3941         if (ifm->ifa_index)
3942                 dev = __dev_get_by_index(net, ifm->ifa_index);
3943
3944         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3945         if (!ifa) {
3946                 err = -EADDRNOTAVAIL;
3947                 goto errout;
3948         }
3949
3950         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3951         if (!skb) {
3952                 err = -ENOBUFS;
3953                 goto errout_ifa;
3954         }
3955
3956         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3957                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3958         if (err < 0) {
3959                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3960                 WARN_ON(err == -EMSGSIZE);
3961                 kfree_skb(skb);
3962                 goto errout_ifa;
3963         }
3964         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3965 errout_ifa:
3966         in6_ifa_put(ifa);
3967 errout:
3968         return err;
3969 }
3970
3971 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3972 {
3973         struct sk_buff *skb;
3974         struct net *net = dev_net(ifa->idev->dev);
3975         int err = -ENOBUFS;
3976
3977         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3978         if (skb == NULL)
3979                 goto errout;
3980
3981         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3982         if (err < 0) {
3983                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3984                 WARN_ON(err == -EMSGSIZE);
3985                 kfree_skb(skb);
3986                 goto errout;
3987         }
3988         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3989         return;
3990 errout:
3991         if (err < 0)
3992                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3993 }
3994
3995 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3996                                 __s32 *array, int bytes)
3997 {
3998         BUG_ON(bytes < (DEVCONF_MAX * 4));
3999
4000         memset(array, 0, bytes);
4001         array[DEVCONF_FORWARDING] = cnf->forwarding;
4002         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4003         array[DEVCONF_MTU6] = cnf->mtu6;
4004         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4005         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4006         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4007         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4008         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4009         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4010                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4011         array[DEVCONF_RTR_SOLICIT_DELAY] =
4012                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4013         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4014 #ifdef CONFIG_IPV6_PRIVACY
4015         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4016         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4017         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4018         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4019         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4020 #endif
4021         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4022         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4023         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4024 #ifdef CONFIG_IPV6_ROUTER_PREF
4025         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4026         array[DEVCONF_RTR_PROBE_INTERVAL] =
4027                 jiffies_to_msecs(cnf->rtr_probe_interval);
4028 #ifdef CONFIG_IPV6_ROUTE_INFO
4029         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4030 #endif
4031 #endif
4032         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4033         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4034 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4035         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4036 #endif
4037 #ifdef CONFIG_IPV6_MROUTE
4038         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4039 #endif
4040         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4041         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4042         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4043         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4044 }
4045
4046 static inline size_t inet6_ifla6_size(void)
4047 {
4048         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4049              + nla_total_size(sizeof(struct ifla_cacheinfo))
4050              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4051              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4052              + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4053 }
4054
4055 static inline size_t inet6_if_nlmsg_size(void)
4056 {
4057         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4058                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4059                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4060                + nla_total_size(4) /* IFLA_MTU */
4061                + nla_total_size(4) /* IFLA_LINK */
4062                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4063 }
4064
4065 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4066                                       int items, int bytes)
4067 {
4068         int i;
4069         int pad = bytes - sizeof(u64) * items;
4070         BUG_ON(pad < 0);
4071
4072         /* Use put_unaligned() because stats may not be aligned for u64. */
4073         put_unaligned(items, &stats[0]);
4074         for (i = 1; i < items; i++)
4075                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4076
4077         memset(&stats[items], 0, pad);
4078 }
4079
4080 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4081                                       int items, int bytes, size_t syncpoff)
4082 {
4083         int i;
4084         int pad = bytes - sizeof(u64) * items;
4085         BUG_ON(pad < 0);
4086
4087         /* Use put_unaligned() because stats may not be aligned for u64. */
4088         put_unaligned(items, &stats[0]);
4089         for (i = 1; i < items; i++)
4090                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4091
4092         memset(&stats[items], 0, pad);
4093 }
4094
4095 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4096                              int bytes)
4097 {
4098         switch (attrtype) {
4099         case IFLA_INET6_STATS:
4100                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4101                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4102                 break;
4103         case IFLA_INET6_ICMP6STATS:
4104                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4105                 break;
4106         }
4107 }
4108
4109 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4110 {
4111         struct nlattr *nla;
4112         struct ifla_cacheinfo ci;
4113
4114         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4115                 goto nla_put_failure;
4116         ci.max_reasm_len = IPV6_MAXPLEN;
4117         ci.tstamp = cstamp_delta(idev->tstamp);
4118         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4119         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4120         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4121                 goto nla_put_failure;
4122         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4123         if (nla == NULL)
4124                 goto nla_put_failure;
4125         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4126
4127         /* XXX - MC not implemented */
4128
4129         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4130         if (nla == NULL)
4131                 goto nla_put_failure;
4132         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4133
4134         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4135         if (nla == NULL)
4136                 goto nla_put_failure;
4137         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4138
4139         return 0;
4140
4141 nla_put_failure:
4142         return -EMSGSIZE;
4143 }
4144
4145 static size_t inet6_get_link_af_size(const struct net_device *dev)
4146 {
4147         if (!__in6_dev_get(dev))
4148                 return 0;
4149
4150         return inet6_ifla6_size();
4151 }
4152
4153 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4154 {
4155         struct inet6_dev *idev = __in6_dev_get(dev);
4156
4157         if (!idev)
4158                 return -ENODATA;
4159
4160         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4161                 return -EMSGSIZE;
4162
4163         return 0;
4164 }
4165
4166 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4167                              u32 portid, u32 seq, int event, unsigned int flags)
4168 {
4169         struct net_device *dev = idev->dev;
4170         struct ifinfomsg *hdr;
4171         struct nlmsghdr *nlh;
4172         void *protoinfo;
4173
4174         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4175         if (nlh == NULL)
4176                 return -EMSGSIZE;
4177
4178         hdr = nlmsg_data(nlh);
4179         hdr->ifi_family = AF_INET6;
4180         hdr->__ifi_pad = 0;
4181         hdr->ifi_type = dev->type;
4182         hdr->ifi_index = dev->ifindex;
4183         hdr->ifi_flags = dev_get_flags(dev);
4184         hdr->ifi_change = 0;
4185
4186         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4187             (dev->addr_len &&
4188              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4189             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4190             (dev->ifindex != dev->iflink &&
4191              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4192                 goto nla_put_failure;
4193         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4194         if (protoinfo == NULL)
4195                 goto nla_put_failure;
4196
4197         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4198                 goto nla_put_failure;
4199
4200         nla_nest_end(skb, protoinfo);
4201         return nlmsg_end(skb, nlh);
4202
4203 nla_put_failure:
4204         nlmsg_cancel(skb, nlh);
4205         return -EMSGSIZE;
4206 }
4207
4208 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4209 {
4210         struct net *net = sock_net(skb->sk);
4211         int h, s_h;
4212         int idx = 0, s_idx;
4213         struct net_device *dev;
4214         struct inet6_dev *idev;
4215         struct hlist_head *head;
4216
4217         s_h = cb->args[0];
4218         s_idx = cb->args[1];
4219
4220         rcu_read_lock();
4221         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4222                 idx = 0;
4223                 head = &net->dev_index_head[h];
4224                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4225                         if (idx < s_idx)
4226                                 goto cont;
4227                         idev = __in6_dev_get(dev);
4228                         if (!idev)
4229                                 goto cont;
4230                         if (inet6_fill_ifinfo(skb, idev,
4231                                               NETLINK_CB(cb->skb).portid,
4232                                               cb->nlh->nlmsg_seq,
4233                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4234                                 goto out;
4235 cont:
4236                         idx++;
4237                 }
4238         }
4239 out:
4240         rcu_read_unlock();
4241         cb->args[1] = idx;
4242         cb->args[0] = h;
4243
4244         return skb->len;
4245 }
4246
4247 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4248 {
4249         struct sk_buff *skb;
4250         struct net *net = dev_net(idev->dev);
4251         int err = -ENOBUFS;
4252
4253         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4254         if (skb == NULL)
4255                 goto errout;
4256
4257         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4258         if (err < 0) {
4259                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4260                 WARN_ON(err == -EMSGSIZE);
4261                 kfree_skb(skb);
4262                 goto errout;
4263         }
4264         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4265         return;
4266 errout:
4267         if (err < 0)
4268                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4269 }
4270
4271 static inline size_t inet6_prefix_nlmsg_size(void)
4272 {
4273         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4274                + nla_total_size(sizeof(struct in6_addr))
4275                + nla_total_size(sizeof(struct prefix_cacheinfo));
4276 }
4277
4278 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4279                              struct prefix_info *pinfo, u32 portid, u32 seq,
4280                              int event, unsigned int flags)
4281 {
4282         struct prefixmsg *pmsg;
4283         struct nlmsghdr *nlh;
4284         struct prefix_cacheinfo ci;
4285
4286         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4287         if (nlh == NULL)
4288                 return -EMSGSIZE;
4289
4290         pmsg = nlmsg_data(nlh);
4291         pmsg->prefix_family = AF_INET6;
4292         pmsg->prefix_pad1 = 0;
4293         pmsg->prefix_pad2 = 0;
4294         pmsg->prefix_ifindex = idev->dev->ifindex;
4295         pmsg->prefix_len = pinfo->prefix_len;
4296         pmsg->prefix_type = pinfo->type;
4297         pmsg->prefix_pad3 = 0;
4298         pmsg->prefix_flags = 0;
4299         if (pinfo->onlink)
4300                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4301         if (pinfo->autoconf)
4302                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4303
4304         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4305                 goto nla_put_failure;
4306         ci.preferred_time = ntohl(pinfo->prefered);
4307         ci.valid_time = ntohl(pinfo->valid);
4308         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4309                 goto nla_put_failure;
4310         return nlmsg_end(skb, nlh);
4311
4312 nla_put_failure:
4313         nlmsg_cancel(skb, nlh);
4314         return -EMSGSIZE;
4315 }
4316
4317 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4318                          struct prefix_info *pinfo)
4319 {
4320         struct sk_buff *skb;
4321         struct net *net = dev_net(idev->dev);
4322         int err = -ENOBUFS;
4323
4324         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4325         if (skb == NULL)
4326                 goto errout;
4327
4328         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4329         if (err < 0) {
4330                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4331                 WARN_ON(err == -EMSGSIZE);
4332                 kfree_skb(skb);
4333                 goto errout;
4334         }
4335         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4336         return;
4337 errout:
4338         if (err < 0)
4339                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4340 }
4341
4342 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4343 {
4344         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4345
4346         switch (event) {
4347         case RTM_NEWADDR:
4348                 /*
4349                  * If the address was optimistic
4350                  * we inserted the route at the start of
4351                  * our DAD process, so we don't need
4352                  * to do it again
4353                  */
4354                 if (!(ifp->rt->rt6i_node))
4355                         ip6_ins_rt(ifp->rt);
4356                 if (ifp->idev->cnf.forwarding)
4357                         addrconf_join_anycast(ifp);
4358                 break;
4359         case RTM_DELADDR:
4360                 if (ifp->idev->cnf.forwarding)
4361                         addrconf_leave_anycast(ifp);
4362                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4363                 dst_hold(&ifp->rt->dst);
4364
4365                 if (ip6_del_rt(ifp->rt))
4366                         dst_free(&ifp->rt->dst);
4367                 break;
4368         }
4369 }
4370
4371 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4372 {
4373         rcu_read_lock_bh();
4374         if (likely(ifp->idev->dead == 0))
4375                 __ipv6_ifa_notify(event, ifp);
4376         rcu_read_unlock_bh();
4377 }
4378
4379 #ifdef CONFIG_SYSCTL
4380
4381 static
4382 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4383                            void __user *buffer, size_t *lenp, loff_t *ppos)
4384 {
4385         int *valp = ctl->data;
4386         int val = *valp;
4387         loff_t pos = *ppos;
4388         ctl_table lctl;
4389         int ret;
4390
4391         /*
4392          * ctl->data points to idev->cnf.forwarding, we should
4393          * not modify it until we get the rtnl lock.
4394          */
4395         lctl = *ctl;
4396         lctl.data = &val;
4397
4398         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4399
4400         if (write)
4401                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4402         if (ret)
4403                 *ppos = pos;
4404         return ret;
4405 }
4406
4407 static void dev_disable_change(struct inet6_dev *idev)
4408 {
4409         if (!idev || !idev->dev)
4410                 return;
4411
4412         if (idev->cnf.disable_ipv6)
4413                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4414         else
4415                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4416 }
4417
4418 static void addrconf_disable_change(struct net *net, __s32 newf)
4419 {
4420         struct net_device *dev;
4421         struct inet6_dev *idev;
4422
4423         rcu_read_lock();
4424         for_each_netdev_rcu(net, dev) {
4425                 idev = __in6_dev_get(dev);
4426                 if (idev) {
4427                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4428                         idev->cnf.disable_ipv6 = newf;
4429                         if (changed)
4430                                 dev_disable_change(idev);
4431                 }
4432         }
4433         rcu_read_unlock();
4434 }
4435
4436 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4437 {
4438         struct net *net;
4439         int old;
4440
4441         if (!rtnl_trylock())
4442                 return restart_syscall();
4443
4444         net = (struct net *)table->extra2;
4445         old = *p;
4446         *p = newf;
4447
4448         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4449                 rtnl_unlock();
4450                 return 0;
4451         }
4452
4453         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4454                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4455                 addrconf_disable_change(net, newf);
4456         } else if ((!newf) ^ (!old))
4457                 dev_disable_change((struct inet6_dev *)table->extra1);
4458
4459         rtnl_unlock();
4460         return 0;
4461 }
4462
4463 static
4464 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4465                             void __user *buffer, size_t *lenp, loff_t *ppos)
4466 {
4467         int *valp = ctl->data;
4468         int val = *valp;
4469         loff_t pos = *ppos;
4470         ctl_table lctl;
4471         int ret;
4472
4473         /*
4474          * ctl->data points to idev->cnf.disable_ipv6, we should
4475          * not modify it until we get the rtnl lock.
4476          */
4477         lctl = *ctl;
4478         lctl.data = &val;
4479
4480         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4481
4482         if (write)
4483                 ret = addrconf_disable_ipv6(ctl, valp, val);
4484         if (ret)
4485                 *ppos = pos;
4486         return ret;
4487 }
4488
4489 static struct addrconf_sysctl_table
4490 {
4491         struct ctl_table_header *sysctl_header;
4492         ctl_table addrconf_vars[DEVCONF_MAX+1];
4493 } addrconf_sysctl __read_mostly = {
4494         .sysctl_header = NULL,
4495         .addrconf_vars = {
4496                 {
4497                         .procname       = "forwarding",
4498                         .data           = &ipv6_devconf.forwarding,
4499                         .maxlen         = sizeof(int),
4500                         .mode           = 0644,
4501                         .proc_handler   = addrconf_sysctl_forward,
4502                 },
4503                 {
4504                         .procname       = "hop_limit",
4505                         .data           = &ipv6_devconf.hop_limit,
4506                         .maxlen         = sizeof(int),
4507                         .mode           = 0644,
4508                         .proc_handler   = proc_dointvec,
4509                 },
4510                 {
4511                         .procname       = "mtu",
4512                         .data           = &ipv6_devconf.mtu6,
4513                         .maxlen         = sizeof(int),
4514                         .mode           = 0644,
4515                         .proc_handler   = proc_dointvec,
4516                 },
4517                 {
4518                         .procname       = "accept_ra",
4519                         .data           = &ipv6_devconf.accept_ra,
4520                         .maxlen         = sizeof(int),
4521                         .mode           = 0644,
4522                         .proc_handler   = proc_dointvec,
4523                 },
4524                 {
4525                         .procname       = "accept_redirects",
4526                         .data           = &ipv6_devconf.accept_redirects,
4527                         .maxlen         = sizeof(int),
4528                         .mode           = 0644,
4529                         .proc_handler   = proc_dointvec,
4530                 },
4531                 {
4532                         .procname       = "autoconf",
4533                         .data           = &ipv6_devconf.autoconf,
4534                         .maxlen         = sizeof(int),
4535                         .mode           = 0644,
4536                         .proc_handler   = proc_dointvec,
4537                 },
4538                 {
4539                         .procname       = "dad_transmits",
4540                         .data           = &ipv6_devconf.dad_transmits,
4541                         .maxlen         = sizeof(int),
4542                         .mode           = 0644,
4543                         .proc_handler   = proc_dointvec,
4544                 },
4545                 {
4546                         .procname       = "router_solicitations",
4547                         .data           = &ipv6_devconf.rtr_solicits,
4548                         .maxlen         = sizeof(int),
4549                         .mode           = 0644,
4550                         .proc_handler   = proc_dointvec,
4551                 },
4552                 {
4553                         .procname       = "router_solicitation_interval",
4554                         .data           = &ipv6_devconf.rtr_solicit_interval,
4555                         .maxlen         = sizeof(int),
4556                         .mode           = 0644,
4557                         .proc_handler   = proc_dointvec_jiffies,
4558                 },
4559                 {
4560                         .procname       = "router_solicitation_delay",
4561                         .data           = &ipv6_devconf.rtr_solicit_delay,
4562                         .maxlen         = sizeof(int),
4563                         .mode           = 0644,
4564                         .proc_handler   = proc_dointvec_jiffies,
4565                 },
4566                 {
4567                         .procname       = "force_mld_version",
4568                         .data           = &ipv6_devconf.force_mld_version,
4569                         .maxlen         = sizeof(int),
4570                         .mode           = 0644,
4571                         .proc_handler   = proc_dointvec,
4572                 },
4573 #ifdef CONFIG_IPV6_PRIVACY
4574                 {
4575                         .procname       = "use_tempaddr",
4576                         .data           = &ipv6_devconf.use_tempaddr,
4577                         .maxlen         = sizeof(int),
4578                         .mode           = 0644,
4579                         .proc_handler   = proc_dointvec,
4580                 },
4581                 {
4582                         .procname       = "temp_valid_lft",
4583                         .data           = &ipv6_devconf.temp_valid_lft,
4584                         .maxlen         = sizeof(int),
4585                         .mode           = 0644,
4586                         .proc_handler   = proc_dointvec,
4587                 },
4588                 {
4589                         .procname       = "temp_prefered_lft",
4590                         .data           = &ipv6_devconf.temp_prefered_lft,
4591                         .maxlen         = sizeof(int),
4592                         .mode           = 0644,
4593                         .proc_handler   = proc_dointvec,
4594                 },
4595                 {
4596                         .procname       = "regen_max_retry",
4597                         .data           = &ipv6_devconf.regen_max_retry,
4598                         .maxlen         = sizeof(int),
4599                         .mode           = 0644,
4600                         .proc_handler   = proc_dointvec,
4601                 },
4602                 {
4603                         .procname       = "max_desync_factor",
4604                         .data           = &ipv6_devconf.max_desync_factor,
4605                         .maxlen         = sizeof(int),
4606                         .mode           = 0644,
4607                         .proc_handler   = proc_dointvec,
4608                 },
4609 #endif
4610                 {
4611                         .procname       = "max_addresses",
4612                         .data           = &ipv6_devconf.max_addresses,
4613                         .maxlen         = sizeof(int),
4614                         .mode           = 0644,
4615                         .proc_handler   = proc_dointvec,
4616                 },
4617                 {
4618                         .procname       = "accept_ra_defrtr",
4619                         .data           = &ipv6_devconf.accept_ra_defrtr,
4620                         .maxlen         = sizeof(int),
4621                         .mode           = 0644,
4622                         .proc_handler   = proc_dointvec,
4623                 },
4624                 {
4625                         .procname       = "accept_ra_pinfo",
4626                         .data           = &ipv6_devconf.accept_ra_pinfo,
4627                         .maxlen         = sizeof(int),
4628                         .mode           = 0644,
4629                         .proc_handler   = proc_dointvec,
4630                 },
4631 #ifdef CONFIG_IPV6_ROUTER_PREF
4632                 {
4633                         .procname       = "accept_ra_rtr_pref",
4634                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4635                         .maxlen         = sizeof(int),
4636                         .mode           = 0644,
4637                         .proc_handler   = proc_dointvec,
4638                 },
4639                 {
4640                         .procname       = "router_probe_interval",
4641                         .data           = &ipv6_devconf.rtr_probe_interval,
4642                         .maxlen         = sizeof(int),
4643                         .mode           = 0644,
4644                         .proc_handler   = proc_dointvec_jiffies,
4645                 },
4646 #ifdef CONFIG_IPV6_ROUTE_INFO
4647                 {
4648                         .procname       = "accept_ra_rt_info_max_plen",
4649                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4650                         .maxlen         = sizeof(int),
4651                         .mode           = 0644,
4652                         .proc_handler   = proc_dointvec,
4653                 },
4654 #endif
4655 #endif
4656                 {
4657                         .procname       = "proxy_ndp",
4658                         .data           = &ipv6_devconf.proxy_ndp,
4659                         .maxlen         = sizeof(int),
4660                         .mode           = 0644,
4661                         .proc_handler   = proc_dointvec,
4662                 },
4663                 {
4664                         .procname       = "accept_source_route",
4665                         .data           = &ipv6_devconf.accept_source_route,
4666                         .maxlen         = sizeof(int),
4667                         .mode           = 0644,
4668                         .proc_handler   = proc_dointvec,
4669                 },
4670 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4671                 {
4672                         .procname       = "optimistic_dad",
4673                         .data           = &ipv6_devconf.optimistic_dad,
4674                         .maxlen         = sizeof(int),
4675                         .mode           = 0644,
4676                         .proc_handler   = proc_dointvec,
4677
4678                 },
4679 #endif
4680 #ifdef CONFIG_IPV6_MROUTE
4681                 {
4682                         .procname       = "mc_forwarding",
4683                         .data           = &ipv6_devconf.mc_forwarding,
4684                         .maxlen         = sizeof(int),
4685                         .mode           = 0444,
4686                         .proc_handler   = proc_dointvec,
4687                 },
4688 #endif
4689                 {
4690                         .procname       = "disable_ipv6",
4691                         .data           = &ipv6_devconf.disable_ipv6,
4692                         .maxlen         = sizeof(int),
4693                         .mode           = 0644,
4694                         .proc_handler   = addrconf_sysctl_disable,
4695                 },
4696                 {
4697                         .procname       = "accept_dad",
4698                         .data           = &ipv6_devconf.accept_dad,
4699                         .maxlen         = sizeof(int),
4700                         .mode           = 0644,
4701                         .proc_handler   = proc_dointvec,
4702                 },
4703                 {
4704                         .procname       = "force_tllao",
4705                         .data           = &ipv6_devconf.force_tllao,
4706                         .maxlen         = sizeof(int),
4707                         .mode           = 0644,
4708                         .proc_handler   = proc_dointvec
4709                 },
4710                 {
4711                         .procname       = "ndisc_notify",
4712                         .data           = &ipv6_devconf.ndisc_notify,
4713                         .maxlen         = sizeof(int),
4714                         .mode           = 0644,
4715                         .proc_handler   = proc_dointvec
4716                 },
4717                 {
4718                         /* sentinel */
4719                 }
4720         },
4721 };
4722
4723 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4724                 struct inet6_dev *idev, struct ipv6_devconf *p)
4725 {
4726         int i;
4727         struct addrconf_sysctl_table *t;
4728         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4729
4730         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4731         if (t == NULL)
4732                 goto out;
4733
4734         for (i = 0; t->addrconf_vars[i].data; i++) {
4735                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4736                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4737                 t->addrconf_vars[i].extra2 = net;
4738         }
4739
4740         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4741
4742         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4743         if (t->sysctl_header == NULL)
4744                 goto free;
4745
4746         p->sysctl = t;
4747         return 0;
4748
4749 free:
4750         kfree(t);
4751 out:
4752         return -ENOBUFS;
4753 }
4754
4755 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4756 {
4757         struct addrconf_sysctl_table *t;
4758
4759         if (p->sysctl == NULL)
4760                 return;
4761
4762         t = p->sysctl;
4763         p->sysctl = NULL;
4764         unregister_net_sysctl_table(t->sysctl_header);
4765         kfree(t);
4766 }
4767
4768 static void addrconf_sysctl_register(struct inet6_dev *idev)
4769 {
4770         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4771                               &ndisc_ifinfo_sysctl_change);
4772         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4773                                         idev, &idev->cnf);
4774 }
4775
4776 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4777 {
4778         __addrconf_sysctl_unregister(&idev->cnf);
4779         neigh_sysctl_unregister(idev->nd_parms);
4780 }
4781
4782
4783 #endif
4784
4785 static int __net_init addrconf_init_net(struct net *net)
4786 {
4787         int err = -ENOMEM;
4788         struct ipv6_devconf *all, *dflt;
4789
4790         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
4791         if (all == NULL)
4792                 goto err_alloc_all;
4793
4794         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4795         if (dflt == NULL)
4796                 goto err_alloc_dflt;
4797
4798         /* these will be inherited by all namespaces */
4799         dflt->autoconf = ipv6_defaults.autoconf;
4800         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4801
4802         net->ipv6.devconf_all = all;
4803         net->ipv6.devconf_dflt = dflt;
4804
4805 #ifdef CONFIG_SYSCTL
4806         err = __addrconf_sysctl_register(net, "all", NULL, all);
4807         if (err < 0)
4808                 goto err_reg_all;
4809
4810         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4811         if (err < 0)
4812                 goto err_reg_dflt;
4813 #endif
4814         return 0;
4815
4816 #ifdef CONFIG_SYSCTL
4817 err_reg_dflt:
4818         __addrconf_sysctl_unregister(all);
4819 err_reg_all:
4820         kfree(dflt);
4821 #endif
4822 err_alloc_dflt:
4823         kfree(all);
4824 err_alloc_all:
4825         return err;
4826 }
4827
4828 static void __net_exit addrconf_exit_net(struct net *net)
4829 {
4830 #ifdef CONFIG_SYSCTL
4831         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4832         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4833 #endif
4834         if (!net_eq(net, &init_net)) {
4835                 kfree(net->ipv6.devconf_dflt);
4836                 kfree(net->ipv6.devconf_all);
4837         }
4838 }
4839
4840 static struct pernet_operations addrconf_ops = {
4841         .init = addrconf_init_net,
4842         .exit = addrconf_exit_net,
4843 };
4844
4845 /*
4846  *      Device notifier
4847  */
4848
4849 int register_inet6addr_notifier(struct notifier_block *nb)
4850 {
4851         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4852 }
4853 EXPORT_SYMBOL(register_inet6addr_notifier);
4854
4855 int unregister_inet6addr_notifier(struct notifier_block *nb)
4856 {
4857         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4858 }
4859 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4860
4861 static struct rtnl_af_ops inet6_ops = {
4862         .family           = AF_INET6,
4863         .fill_link_af     = inet6_fill_link_af,
4864         .get_link_af_size = inet6_get_link_af_size,
4865 };
4866
4867 /*
4868  *      Init / cleanup code
4869  */
4870
4871 int __init addrconf_init(void)
4872 {
4873         int i, err;
4874
4875         err = ipv6_addr_label_init();
4876         if (err < 0) {
4877                 pr_crit("%s: cannot initialize default policy table: %d\n",
4878                         __func__, err);
4879                 goto out;
4880         }
4881
4882         err = register_pernet_subsys(&addrconf_ops);
4883         if (err < 0)
4884                 goto out_addrlabel;
4885
4886         /* The addrconf netdev notifier requires that loopback_dev
4887          * has it's ipv6 private information allocated and setup
4888          * before it can bring up and give link-local addresses
4889          * to other devices which are up.
4890          *
4891          * Unfortunately, loopback_dev is not necessarily the first
4892          * entry in the global dev_base list of net devices.  In fact,
4893          * it is likely to be the very last entry on that list.
4894          * So this causes the notifier registry below to try and
4895          * give link-local addresses to all devices besides loopback_dev
4896          * first, then loopback_dev, which cases all the non-loopback_dev
4897          * devices to fail to get a link-local address.
4898          *
4899          * So, as a temporary fix, allocate the ipv6 structure for
4900          * loopback_dev first by hand.
4901          * Longer term, all of the dependencies ipv6 has upon the loopback
4902          * device and it being up should be removed.
4903          */
4904         rtnl_lock();
4905         if (!ipv6_add_dev(init_net.loopback_dev))
4906                 err = -ENOMEM;
4907         rtnl_unlock();
4908         if (err)
4909                 goto errlo;
4910
4911         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4912                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4913
4914         register_netdevice_notifier(&ipv6_dev_notf);
4915
4916         addrconf_verify(0);
4917
4918         err = rtnl_af_register(&inet6_ops);
4919         if (err < 0)
4920                 goto errout_af;
4921
4922         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4923                               NULL);
4924         if (err < 0)
4925                 goto errout;
4926
4927         /* Only the first call to __rtnl_register can fail */
4928         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4929         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4930         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4931                         inet6_dump_ifaddr, NULL);
4932         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4933                         inet6_dump_ifmcaddr, NULL);
4934         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4935                         inet6_dump_ifacaddr, NULL);
4936         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4937                         NULL, NULL);
4938
4939         ipv6_addr_label_rtnl_register();
4940
4941         return 0;
4942 errout:
4943         rtnl_af_unregister(&inet6_ops);
4944 errout_af:
4945         unregister_netdevice_notifier(&ipv6_dev_notf);
4946 errlo:
4947         unregister_pernet_subsys(&addrconf_ops);
4948 out_addrlabel:
4949         ipv6_addr_label_cleanup();
4950 out:
4951         return err;
4952 }
4953
4954 void addrconf_cleanup(void)
4955 {
4956         struct net_device *dev;
4957         int i;
4958
4959         unregister_netdevice_notifier(&ipv6_dev_notf);
4960         unregister_pernet_subsys(&addrconf_ops);
4961         ipv6_addr_label_cleanup();
4962
4963         rtnl_lock();
4964
4965         __rtnl_af_unregister(&inet6_ops);
4966
4967         /* clean dev list */
4968         for_each_netdev(&init_net, dev) {
4969                 if (__in6_dev_get(dev) == NULL)
4970                         continue;
4971                 addrconf_ifdown(dev, 1);
4972         }
4973         addrconf_ifdown(init_net.loopback_dev, 2);
4974
4975         /*
4976          *      Check hash table.
4977          */
4978         spin_lock_bh(&addrconf_hash_lock);
4979         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4980                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4981         spin_unlock_bh(&addrconf_hash_lock);
4982
4983         del_timer(&addr_chk_timer);
4984         rtnl_unlock();
4985 }