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/inet.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_addr.h>
  53 #include <linux/if_arp.h>
  54 #include <linux/if_arcnet.h>
  55 #include <linux/if_infiniband.h>
  56 #include <linux/route.h>
  57 #include <linux/inetdevice.h>
  58 #include <linux/init.h>
  59 #include <linux/slab.h>
  60 #ifdef CONFIG_SYSCTL
  61 #include <linux/sysctl.h>
  62 #endif
  63 #include <linux/capability.h>
  64 #include <linux/delay.h>
  65 #include <linux/notifier.h>
  66 #include <linux/string.h>
  67 #include <linux/hash.h>
  68
  69 #include <net/net_namespace.h>
  70 #include <net/sock.h>
  71 #include <net/snmp.h>
  72
  73 #include <net/af_ieee802154.h>
  74 #include <net/firewire.h>
  75 #include <net/ipv6.h>
  76 #include <net/protocol.h>
  77 #include <net/ndisc.h>
  78 #include <net/ip6_route.h>
  79 #include <net/addrconf.h>
  80 #include <net/tcp.h>
  81 #include <net/ip.h>
  82 #include <net/netlink.h>
  83 #include <net/pkt_sched.h>
  84 #include <net/l3mdev.h>
  85 #include <linux/if_tunnel.h>
  86 #include <linux/rtnetlink.h>
  87 #include <linux/netconf.h>
  88 #include <linux/random.h>
  89 #include <linux/uaccess.h>
  90 #include <asm/unaligned.h>
  91
  92 #include <linux/proc_fs.h>
  93 #include <linux/seq_file.h>
  94 #include <linux/export.h>
  95
  96 /* Set to 3 to get tracing... */
  97 #define ACONF_DEBUG 2
  98
  99 #if ACONF_DEBUG >= 3
 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
 101 #else
 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 103 #endif
 104
 105 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 106
 107 #define IPV6_MAX_STRLEN \
 108         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
 109
 110 static inline u32 cstamp_delta(unsigned long cstamp)
 111 {
 112         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 113 }
 114
 115 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 116 {
 117         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 118         u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
 119         do_div(tmp, 1000000);
 120         return (s32)tmp;
 121 }
 122
 123 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 124 {
 125         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 126         u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
 127         do_div(tmp, 1000000);
 128         if ((s32)tmp > mrt) {
 129                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 130                 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
 131                 do_div(tmp, 1000000);
 132         }
 133         return (s32)tmp;
 134 }
 135
 136 #ifdef CONFIG_SYSCTL
 137 static int addrconf_sysctl_register(struct inet6_dev *idev);
 138 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 139 #else
 140 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 141 {
 142         return 0;
 143 }
 144
 145 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 146 {
 147 }
 148 #endif
 149
 150 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 151 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 152 static void ipv6_regen_rndid(unsigned long data);
 153
 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 155 static int ipv6_count_addresses(struct inet6_dev *idev);
 156 static int ipv6_generate_stable_address(struct in6_addr *addr,
 157                                         u8 dad_count,
 158                                         const struct inet6_dev *idev);
 159
 160 /*
 161  *      Configured unicast address hash table
 162  */
 163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 164 static DEFINE_SPINLOCK(addrconf_hash_lock);
 165
 166 static void addrconf_verify(void);
 167 static void addrconf_verify_rtnl(void);
 168 static void addrconf_verify_work(struct work_struct *);
 169
 170 static struct workqueue_struct *addrconf_wq;
 171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 172
 173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 175
 176 static void addrconf_type_change(struct net_device *dev,
 177                                  unsigned long event);
 178 static int addrconf_ifdown(struct net_device *dev, int how);
 179
 180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 181                                                   int plen,
 182                                                   const struct net_device *dev,
 183                                                   u32 flags, u32 noflags);
 184
 185 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 186 static void addrconf_dad_work(struct work_struct *w);
 187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 188 static void addrconf_dad_run(struct inet6_dev *idev);
 189 static void addrconf_rs_timer(unsigned long data);
 190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 192
 193 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 194                                 struct prefix_info *pinfo);
 195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 196                                struct net_device *dev);
 197
 198 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 199         .forwarding             = 0,
 200         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 201         .mtu6                   = IPV6_MIN_MTU,
 202         .accept_ra              = 1,
 203         .accept_redirects       = 1,
 204         .autoconf               = 1,
 205         .force_mld_version      = 0,
 206         .mldv1_unsolicited_report_interval = 10 * HZ,
 207         .mldv2_unsolicited_report_interval = HZ,
 208         .dad_transmits          = 1,
 209         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 210         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 211         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 212         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 213         .use_tempaddr           = 0,
 214         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 215         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 216         .regen_max_retry        = REGEN_MAX_RETRY,
 217         .max_desync_factor      = MAX_DESYNC_FACTOR,
 218         .max_addresses          = IPV6_MAX_ADDRESSES,
 219         .accept_ra_defrtr       = 1,
 220         .accept_ra_from_local   = 0,
 221         .accept_ra_min_hop_limit= 1,
 222         .accept_ra_pinfo        = 1,
 223 #ifdef CONFIG_IPV6_ROUTER_PREF
 224         .accept_ra_rtr_pref     = 1,
 225         .rtr_probe_interval     = 60 * HZ,
 226 #ifdef CONFIG_IPV6_ROUTE_INFO
 227         .accept_ra_rt_info_min_plen = 0,
 228         .accept_ra_rt_info_max_plen = 0,
 229 #endif
 230 #endif
 231         .accept_ra_rt_table     = 0,
 232         .proxy_ndp              = 0,
 233         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 234         .disable_ipv6           = 0,
 235         .accept_dad             = 1,
 236         .suppress_frag_ndisc    = 1,
 237         .accept_ra_mtu          = 1,
 238         .stable_secret          = {
 239                 .initialized = false,
 240         },
 241         .use_oif_addrs_only     = 0,
 242         .ignore_routes_with_linkdown = 0,
 243 };
 244
 245 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 246         .forwarding             = 0,
 247         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 248         .mtu6                   = IPV6_MIN_MTU,
 249         .accept_ra              = 1,
 250         .accept_redirects       = 1,
 251         .autoconf               = 1,
 252         .force_mld_version      = 0,
 253         .mldv1_unsolicited_report_interval = 10 * HZ,
 254         .mldv2_unsolicited_report_interval = HZ,
 255         .dad_transmits          = 1,
 256         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 257         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 258         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 259         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 260         .use_tempaddr           = 0,
 261         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 262         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 263         .regen_max_retry        = REGEN_MAX_RETRY,
 264         .max_desync_factor      = MAX_DESYNC_FACTOR,
 265         .max_addresses          = IPV6_MAX_ADDRESSES,
 266         .accept_ra_defrtr       = 1,
 267         .accept_ra_from_local   = 0,
 268         .accept_ra_min_hop_limit= 1,
 269         .accept_ra_pinfo        = 1,
 270 #ifdef CONFIG_IPV6_ROUTER_PREF
 271         .accept_ra_rtr_pref     = 1,
 272         .rtr_probe_interval     = 60 * HZ,
 273 #ifdef CONFIG_IPV6_ROUTE_INFO
 274         .accept_ra_rt_info_min_plen = 0,
 275         .accept_ra_rt_info_max_plen = 0,
 276 #endif
 277 #endif
 278         .accept_ra_rt_table     = 0,
 279         .proxy_ndp              = 0,
 280         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 281         .disable_ipv6           = 0,
 282         .accept_dad             = 1,
 283         .suppress_frag_ndisc    = 1,
 284         .accept_ra_mtu          = 1,
 285         .stable_secret          = {
 286                 .initialized = false,
 287         },
 288         .use_oif_addrs_only     = 0,
 289         .ignore_routes_with_linkdown = 0,
 290 };
 291
 292 /* Check if a valid qdisc is available */
 293 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 294 {
 295         return !qdisc_tx_is_noop(dev);
 296 }
 297
 298 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 299 {
 300         if (del_timer(&idev->rs_timer))
 301                 __in6_dev_put(idev);
 302 }
 303
 304 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 305 {
 306         if (cancel_delayed_work(&ifp->dad_work))
 307                 __in6_ifa_put(ifp);
 308 }
 309
 310 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 311                                   unsigned long when)
 312 {
 313         if (!timer_pending(&idev->rs_timer))
 314                 in6_dev_hold(idev);
 315         mod_timer(&idev->rs_timer, jiffies + when);
 316 }
 317
 318 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 319                                    unsigned long delay)
 320 {
 321         in6_ifa_hold(ifp);
 322         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 323                 in6_ifa_put(ifp);
 324 }
 325
 326 static int snmp6_alloc_dev(struct inet6_dev *idev)
 327 {
 328         int i;
 329
 330         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 331         if (!idev->stats.ipv6)
 332                 goto err_ip;
 333
 334         for_each_possible_cpu(i) {
 335                 struct ipstats_mib *addrconf_stats;
 336                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 337                 u64_stats_init(&addrconf_stats->syncp);
 338         }
 339
 340
 341         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 342                                         GFP_KERNEL);
 343         if (!idev->stats.icmpv6dev)
 344                 goto err_icmp;
 345         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 346                                            GFP_KERNEL);
 347         if (!idev->stats.icmpv6msgdev)
 348                 goto err_icmpmsg;
 349
 350         return 0;
 351
 352 err_icmpmsg:
 353         kfree(idev->stats.icmpv6dev);
 354 err_icmp:
 355         free_percpu(idev->stats.ipv6);
 356 err_ip:
 357         return -ENOMEM;
 358 }
 359
 360 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 361 {
 362         struct inet6_dev *ndev;
 363         int err = -ENOMEM;
 364
 365         ASSERT_RTNL();
 366
 367         if (dev->mtu < IPV6_MIN_MTU)
 368                 return ERR_PTR(-EINVAL);
 369
 370         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 371         if (!ndev)
 372                 return ERR_PTR(err);
 373
 374         rwlock_init(&ndev->lock);
 375         ndev->dev = dev;
 376         INIT_LIST_HEAD(&ndev->addr_list);
 377         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 378                     (unsigned long)ndev);
 379         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 380
 381         if (ndev->cnf.stable_secret.initialized)
 382                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 383         else
 384                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
 385
 386         ndev->cnf.mtu6 = dev->mtu;
 387         ndev->cnf.sysctl = NULL;
 388         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 389         if (!ndev->nd_parms) {
 390                 kfree(ndev);
 391                 return ERR_PTR(err);
 392         }
 393         if (ndev->cnf.forwarding)
 394                 dev_disable_lro(dev);
 395         /* We refer to the device */
 396         dev_hold(dev);
 397
 398         if (snmp6_alloc_dev(ndev) < 0) {
 399                 ADBG(KERN_WARNING
 400                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 401                         __func__, dev->name);
 402                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 403                 dev_put(dev);
 404                 kfree(ndev);
 405                 return ERR_PTR(err);
 406         }
 407
 408         if (snmp6_register_dev(ndev) < 0) {
 409                 ADBG(KERN_WARNING
 410                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 411                         __func__, dev->name);
 412                 goto err_release;
 413         }
 414
 415         /* One reference from device.  We must do this before
 416          * we invoke __ipv6_regen_rndid().
 417          */
 418         in6_dev_hold(ndev);
 419
 420         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 421                 ndev->cnf.accept_dad = -1;
 422
 423 #if IS_ENABLED(CONFIG_IPV6_SIT)
 424         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 425                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 426                 ndev->cnf.rtr_solicits = 0;
 427         }
 428 #endif
 429
 430         INIT_LIST_HEAD(&ndev->tempaddr_list);
 431         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 432         if ((dev->flags&IFF_LOOPBACK) ||
 433             dev->type == ARPHRD_TUNNEL ||
 434             dev->type == ARPHRD_TUNNEL6 ||
 435             dev->type == ARPHRD_SIT ||
 436             dev->type == ARPHRD_NONE) {
 437                 ndev->cnf.use_tempaddr = -1;
 438         } else {
 439                 in6_dev_hold(ndev);
 440                 ipv6_regen_rndid((unsigned long) ndev);
 441         }
 442
 443         ndev->token = in6addr_any;
 444
 445         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 446                 ndev->if_flags |= IF_READY;
 447
 448         ipv6_mc_init_dev(ndev);
 449         ndev->tstamp = jiffies;
 450         err = addrconf_sysctl_register(ndev);
 451         if (err) {
 452                 ipv6_mc_destroy_dev(ndev);
 453                 del_timer(&ndev->regen_timer);
 454                 snmp6_unregister_dev(ndev);
 455                 goto err_release;
 456         }
 457         /* protected by rtnl_lock */
 458         rcu_assign_pointer(dev->ip6_ptr, ndev);
 459
 460         /* Join interface-local all-node multicast group */
 461         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 462
 463         /* Join all-node multicast group */
 464         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 465
 466         /* Join all-router multicast group if forwarding is set */
 467         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 468                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 469
 470         return ndev;
 471
 472 err_release:
 473         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 474         ndev->dead = 1;
 475         in6_dev_finish_destroy(ndev);
 476         return ERR_PTR(err);
 477 }
 478
 479 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 480 {
 481         struct inet6_dev *idev;
 482
 483         ASSERT_RTNL();
 484
 485         idev = __in6_dev_get(dev);
 486         if (!idev) {
 487                 idev = ipv6_add_dev(dev);
 488                 if (IS_ERR(idev))
 489                         return NULL;
 490         }
 491
 492         if (dev->flags&IFF_UP)
 493                 ipv6_mc_up(idev);
 494         return idev;
 495 }
 496
 497 static int inet6_netconf_msgsize_devconf(int type)
 498 {
 499         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 500                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 501
 502         /* type -1 is used for ALL */
 503         if (type == -1 || type == NETCONFA_FORWARDING)
 504                 size += nla_total_size(4);
 505 #ifdef CONFIG_IPV6_MROUTE
 506         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 507                 size += nla_total_size(4);
 508 #endif
 509         if (type == -1 || type == NETCONFA_PROXY_NEIGH)
 510                 size += nla_total_size(4);
 511
 512         if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 513                 size += nla_total_size(4);
 514
 515         return size;
 516 }
 517
 518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 519                                       struct ipv6_devconf *devconf, u32 portid,
 520                                       u32 seq, int event, unsigned int flags,
 521                                       int type)
 522 {
 523         struct nlmsghdr  *nlh;
 524         struct netconfmsg *ncm;
 525
 526         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 527                         flags);
 528         if (!nlh)
 529                 return -EMSGSIZE;
 530
 531         ncm = nlmsg_data(nlh);
 532         ncm->ncm_family = AF_INET6;
 533
 534         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 535                 goto nla_put_failure;
 536
 537         /* type -1 is used for ALL */
 538         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 539             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 540                 goto nla_put_failure;
 541 #ifdef CONFIG_IPV6_MROUTE
 542         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 543             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 544                         devconf->mc_forwarding) < 0)
 545                 goto nla_put_failure;
 546 #endif
 547         if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
 548             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 549                 goto nla_put_failure;
 550
 551         if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 552             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 553                         devconf->ignore_routes_with_linkdown) < 0)
 554                 goto nla_put_failure;
 555
 556         nlmsg_end(skb, nlh);
 557         return 0;
 558
 559 nla_put_failure:
 560         nlmsg_cancel(skb, nlh);
 561         return -EMSGSIZE;
 562 }
 563
 564 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 565                                   struct ipv6_devconf *devconf)
 566 {
 567         struct sk_buff *skb;
 568         int err = -ENOBUFS;
 569
 570         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 571         if (!skb)
 572                 goto errout;
 573
 574         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 575                                          RTM_NEWNETCONF, 0, type);
 576         if (err < 0) {
 577                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 578                 WARN_ON(err == -EMSGSIZE);
 579                 kfree_skb(skb);
 580                 goto errout;
 581         }
 582         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 583         return;
 584 errout:
 585         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 586 }
 587
 588 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 589         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 590         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 591         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 592         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 593 };
 594
 595 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 596                                      struct nlmsghdr *nlh)
 597 {
 598         struct net *net = sock_net(in_skb->sk);
 599         struct nlattr *tb[NETCONFA_MAX+1];
 600         struct netconfmsg *ncm;
 601         struct sk_buff *skb;
 602         struct ipv6_devconf *devconf;
 603         struct inet6_dev *in6_dev;
 604         struct net_device *dev;
 605         int ifindex;
 606         int err;
 607
 608         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 609                           devconf_ipv6_policy);
 610         if (err < 0)
 611                 goto errout;
 612
 613         err = -EINVAL;
 614         if (!tb[NETCONFA_IFINDEX])
 615                 goto errout;
 616
 617         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 618         switch (ifindex) {
 619         case NETCONFA_IFINDEX_ALL:
 620                 devconf = net->ipv6.devconf_all;
 621                 break;
 622         case NETCONFA_IFINDEX_DEFAULT:
 623                 devconf = net->ipv6.devconf_dflt;
 624                 break;
 625         default:
 626                 dev = __dev_get_by_index(net, ifindex);
 627                 if (!dev)
 628                         goto errout;
 629                 in6_dev = __in6_dev_get(dev);
 630                 if (!in6_dev)
 631                         goto errout;
 632                 devconf = &in6_dev->cnf;
 633                 break;
 634         }
 635
 636         err = -ENOBUFS;
 637         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 638         if (!skb)
 639                 goto errout;
 640
 641         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 642                                          NETLINK_CB(in_skb).portid,
 643                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 644                                          -1);
 645         if (err < 0) {
 646                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 647                 WARN_ON(err == -EMSGSIZE);
 648                 kfree_skb(skb);
 649                 goto errout;
 650         }
 651         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 652 errout:
 653         return err;
 654 }
 655
 656 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 657                                       struct netlink_callback *cb)
 658 {
 659         struct net *net = sock_net(skb->sk);
 660         int h, s_h;
 661         int idx, s_idx;
 662         struct net_device *dev;
 663         struct inet6_dev *idev;
 664         struct hlist_head *head;
 665
 666         s_h = cb->args[0];
 667         s_idx = idx = cb->args[1];
 668
 669         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 670                 idx = 0;
 671                 head = &net->dev_index_head[h];
 672                 rcu_read_lock();
 673                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 674                           net->dev_base_seq;
 675                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 676                         if (idx < s_idx)
 677                                 goto cont;
 678                         idev = __in6_dev_get(dev);
 679                         if (!idev)
 680                                 goto cont;
 681
 682                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 683                                                        &idev->cnf,
 684                                                        NETLINK_CB(cb->skb).portid,
 685                                                        cb->nlh->nlmsg_seq,
 686                                                        RTM_NEWNETCONF,
 687                                                        NLM_F_MULTI,
 688                                                        -1) < 0) {
 689                                 rcu_read_unlock();
 690                                 goto done;
 691                         }
 692                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 693 cont:
 694                         idx++;
 695                 }
 696                 rcu_read_unlock();
 697         }
 698         if (h == NETDEV_HASHENTRIES) {
 699                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 700                                                net->ipv6.devconf_all,
 701                                                NETLINK_CB(cb->skb).portid,
 702                                                cb->nlh->nlmsg_seq,
 703                                                RTM_NEWNETCONF, NLM_F_MULTI,
 704                                                -1) < 0)
 705                         goto done;
 706                 else
 707                         h++;
 708         }
 709         if (h == NETDEV_HASHENTRIES + 1) {
 710                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 711                                                net->ipv6.devconf_dflt,
 712                                                NETLINK_CB(cb->skb).portid,
 713                                                cb->nlh->nlmsg_seq,
 714                                                RTM_NEWNETCONF, NLM_F_MULTI,
 715                                                -1) < 0)
 716                         goto done;
 717                 else
 718                         h++;
 719         }
 720 done:
 721         cb->args[0] = h;
 722         cb->args[1] = idx;
 723
 724         return skb->len;
 725 }
 726
 727 #ifdef CONFIG_SYSCTL
 728 static void dev_forward_change(struct inet6_dev *idev)
 729 {
 730         struct net_device *dev;
 731         struct inet6_ifaddr *ifa;
 732
 733         if (!idev)
 734                 return;
 735         dev = idev->dev;
 736         if (idev->cnf.forwarding)
 737                 dev_disable_lro(dev);
 738         if (dev->flags & IFF_MULTICAST) {
 739                 if (idev->cnf.forwarding) {
 740                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 741                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 742                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 743                 } else {
 744                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 745                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 746                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 747                 }
 748         }
 749
 750         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 751                 if (ifa->flags&IFA_F_TENTATIVE)
 752                         continue;
 753                 if (idev->cnf.forwarding)
 754                         addrconf_join_anycast(ifa);
 755                 else
 756                         addrconf_leave_anycast(ifa);
 757         }
 758         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 759                                      dev->ifindex, &idev->cnf);
 760 }
 761
 762
 763 static void addrconf_forward_change(struct net *net, __s32 newf)
 764 {
 765         struct net_device *dev;
 766         struct inet6_dev *idev;
 767
 768         for_each_netdev(net, dev) {
 769                 idev = __in6_dev_get(dev);
 770                 if (idev) {
 771                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 772                         idev->cnf.forwarding = newf;
 773                         if (changed)
 774                                 dev_forward_change(idev);
 775                 }
 776         }
 777 }
 778
 779 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 780 {
 781         struct net *net;
 782         int old;
 783
 784         if (!rtnl_trylock())
 785                 return restart_syscall();
 786
 787         net = (struct net *)table->extra2;
 788         old = *p;
 789         *p = newf;
 790
 791         if (p == &net->ipv6.devconf_dflt->forwarding) {
 792                 if ((!newf) ^ (!old))
 793                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 794                                                      NETCONFA_IFINDEX_DEFAULT,
 795                                                      net->ipv6.devconf_dflt);
 796                 rtnl_unlock();
 797                 return 0;
 798         }
 799
 800         if (p == &net->ipv6.devconf_all->forwarding) {
 801                 net->ipv6.devconf_dflt->forwarding = newf;
 802                 addrconf_forward_change(net, newf);
 803                 if ((!newf) ^ (!old))
 804                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 805                                                      NETCONFA_IFINDEX_ALL,
 806                                                      net->ipv6.devconf_all);
 807         } else if ((!newf) ^ (!old))
 808                 dev_forward_change((struct inet6_dev *)table->extra1);
 809         rtnl_unlock();
 810
 811         if (newf)
 812                 rt6_purge_dflt_routers(net);
 813         return 1;
 814 }
 815
 816 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 817 {
 818         struct net_device *dev;
 819         struct inet6_dev *idev;
 820
 821         for_each_netdev(net, dev) {
 822                 idev = __in6_dev_get(dev);
 823                 if (idev) {
 824                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 825
 826                         idev->cnf.ignore_routes_with_linkdown = newf;
 827                         if (changed)
 828                                 inet6_netconf_notify_devconf(dev_net(dev),
 829                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 830                                                              dev->ifindex,
 831                                                              &idev->cnf);
 832                 }
 833         }
 834 }
 835
 836 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 837 {
 838         struct net *net;
 839         int old;
 840
 841         if (!rtnl_trylock())
 842                 return restart_syscall();
 843
 844         net = (struct net *)table->extra2;
 845         old = *p;
 846         *p = newf;
 847
 848         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 849                 if ((!newf) ^ (!old))
 850                         inet6_netconf_notify_devconf(net,
 851                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 852                                                      NETCONFA_IFINDEX_DEFAULT,
 853                                                      net->ipv6.devconf_dflt);
 854                 rtnl_unlock();
 855                 return 0;
 856         }
 857
 858         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 859                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 860                 addrconf_linkdown_change(net, newf);
 861                 if ((!newf) ^ (!old))
 862                         inet6_netconf_notify_devconf(net,
 863                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 864                                                      NETCONFA_IFINDEX_ALL,
 865                                                      net->ipv6.devconf_all);
 866         }
 867         rtnl_unlock();
 868
 869         return 1;
 870 }
 871
 872 #endif
 873
 874 /* Nobody refers to this ifaddr, destroy it */
 875 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 876 {
 877         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 878
 879 #ifdef NET_REFCNT_DEBUG
 880         pr_debug("%s\n", __func__);
 881 #endif
 882
 883         in6_dev_put(ifp->idev);
 884
 885         if (cancel_delayed_work(&ifp->dad_work))
 886                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 887                           ifp);
 888
 889         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 890                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 891                 return;
 892         }
 893         ip6_rt_put(ifp->rt);
 894
 895         kfree_rcu(ifp, rcu);
 896 }
 897
 898 static void
 899 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 900 {
 901         struct list_head *p;
 902         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 903
 904         /*
 905          * Each device address list is sorted in order of scope -
 906          * global before linklocal.
 907          */
 908         list_for_each(p, &idev->addr_list) {
 909                 struct inet6_ifaddr *ifa
 910                         = list_entry(p, struct inet6_ifaddr, if_list);
 911                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 912                         break;
 913         }
 914
 915         list_add_tail(&ifp->if_list, p);
 916 }
 917
 918 static u32 inet6_addr_hash(const struct in6_addr *addr)
 919 {
 920         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 921 }
 922
 923 /* On success it returns ifp with increased reference count */
 924
 925 static struct inet6_ifaddr *
 926 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 927               const struct in6_addr *peer_addr, int pfxlen,
 928               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 929 {
 930         struct inet6_ifaddr *ifa = NULL;
 931         struct rt6_info *rt;
 932         unsigned int hash;
 933         int err = 0;
 934         int addr_type = ipv6_addr_type(addr);
 935
 936         if (addr_type == IPV6_ADDR_ANY ||
 937             addr_type & IPV6_ADDR_MULTICAST ||
 938             (!(idev->dev->flags & IFF_LOOPBACK) &&
 939              addr_type & IPV6_ADDR_LOOPBACK))
 940                 return ERR_PTR(-EADDRNOTAVAIL);
 941
 942         rcu_read_lock_bh();
 943         if (idev->dead) {
 944                 err = -ENODEV;                  /*XXX*/
 945                 goto out2;
 946         }
 947
 948         if (idev->cnf.disable_ipv6) {
 949                 err = -EACCES;
 950                 goto out2;
 951         }
 952
 953         spin_lock(&addrconf_hash_lock);
 954
 955         /* Ignore adding duplicate addresses on an interface */
 956         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 957                 ADBG("ipv6_add_addr: already assigned\n");
 958                 err = -EEXIST;
 959                 goto out;
 960         }
 961
 962         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 963
 964         if (!ifa) {
 965                 ADBG("ipv6_add_addr: malloc failed\n");
 966                 err = -ENOBUFS;
 967                 goto out;
 968         }
 969
 970         rt = addrconf_dst_alloc(idev, addr, false);
 971         if (IS_ERR(rt)) {
 972                 err = PTR_ERR(rt);
 973                 goto out;
 974         }
 975
 976         neigh_parms_data_state_setall(idev->nd_parms);
 977
 978         ifa->addr = *addr;
 979         if (peer_addr)
 980                 ifa->peer_addr = *peer_addr;
 981
 982         spin_lock_init(&ifa->lock);
 983         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 984         INIT_HLIST_NODE(&ifa->addr_lst);
 985         ifa->scope = scope;
 986         ifa->prefix_len = pfxlen;
 987         ifa->flags = flags;
 988         /* No need to add the TENTATIVE flag for addresses with NODAD */
 989         if (!(flags & IFA_F_NODAD))
 990                 ifa->flags |= IFA_F_TENTATIVE;
 991         ifa->valid_lft = valid_lft;
 992         ifa->prefered_lft = prefered_lft;
 993         ifa->cstamp = ifa->tstamp = jiffies;
 994         ifa->tokenized = false;
 995
 996         ifa->rt = rt;
 997
 998         ifa->idev = idev;
 999         in6_dev_hold(idev);
1000         /* For caller */
1001         in6_ifa_hold(ifa);
1002
1003         /* Add to big hash table */
1004         hash = inet6_addr_hash(addr);
1005
1006         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1007         spin_unlock(&addrconf_hash_lock);
1008
1009         write_lock(&idev->lock);
1010         /* Add to inet6_dev unicast addr list. */
1011         ipv6_link_dev_addr(idev, ifa);
1012
1013         if (ifa->flags&IFA_F_TEMPORARY) {
1014                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1015                 in6_ifa_hold(ifa);
1016         }
1017
1018         in6_ifa_hold(ifa);
1019         write_unlock(&idev->lock);
1020 out2:
1021         rcu_read_unlock_bh();
1022
1023         if (likely(err == 0))
1024                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1025         else {
1026                 kfree(ifa);
1027                 ifa = ERR_PTR(err);
1028         }
1029
1030         return ifa;
1031 out:
1032         spin_unlock(&addrconf_hash_lock);
1033         goto out2;
1034 }
1035
1036 enum cleanup_prefix_rt_t {
1037         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1038         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1039         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1040 };
1041
1042 /*
1043  * Check, whether the prefix for ifp would still need a prefix route
1044  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1045  * constants.
1046  *
1047  * 1) we don't purge prefix if address was not permanent.
1048  *    prefix is managed by its own lifetime.
1049  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1050  * 3) if there are no addresses, delete prefix.
1051  * 4) if there are still other permanent address(es),
1052  *    corresponding prefix is still permanent.
1053  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1054  *    don't purge the prefix, assume user space is managing it.
1055  * 6) otherwise, update prefix lifetime to the
1056  *    longest valid lifetime among the corresponding
1057  *    addresses on the device.
1058  *    Note: subsequent RA will update lifetime.
1059  **/
1060 static enum cleanup_prefix_rt_t
1061 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1062 {
1063         struct inet6_ifaddr *ifa;
1064         struct inet6_dev *idev = ifp->idev;
1065         unsigned long lifetime;
1066         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1067
1068         *expires = jiffies;
1069
1070         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1071                 if (ifa == ifp)
1072                         continue;
1073                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1074                                        ifp->prefix_len))
1075                         continue;
1076                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1077                         return CLEANUP_PREFIX_RT_NOP;
1078
1079                 action = CLEANUP_PREFIX_RT_EXPIRE;
1080
1081                 spin_lock(&ifa->lock);
1082
1083                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1084                 /*
1085                  * Note: Because this address is
1086                  * not permanent, lifetime <
1087                  * LONG_MAX / HZ here.
1088                  */
1089                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1090                         *expires = ifa->tstamp + lifetime * HZ;
1091                 spin_unlock(&ifa->lock);
1092         }
1093
1094         return action;
1095 }
1096
1097 static void
1098 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1099 {
1100         struct rt6_info *rt;
1101
1102         rt = addrconf_get_prefix_route(&ifp->addr,
1103                                        ifp->prefix_len,
1104                                        ifp->idev->dev,
1105                                        0, RTF_GATEWAY | RTF_DEFAULT);
1106         if (rt) {
1107                 if (del_rt)
1108                         ip6_del_rt(rt);
1109                 else {
1110                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1111                                 rt6_set_expires(rt, expires);
1112                         ip6_rt_put(rt);
1113                 }
1114         }
1115 }
1116
1117
1118 /* This function wants to get referenced ifp and releases it before return */
1119
1120 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1121 {
1122         int state;
1123         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1124         unsigned long expires;
1125
1126         ASSERT_RTNL();
1127
1128         spin_lock_bh(&ifp->lock);
1129         state = ifp->state;
1130         ifp->state = INET6_IFADDR_STATE_DEAD;
1131         spin_unlock_bh(&ifp->lock);
1132
1133         if (state == INET6_IFADDR_STATE_DEAD)
1134                 goto out;
1135
1136         spin_lock_bh(&addrconf_hash_lock);
1137         hlist_del_init_rcu(&ifp->addr_lst);
1138         spin_unlock_bh(&addrconf_hash_lock);
1139
1140         write_lock_bh(&ifp->idev->lock);
1141
1142         if (ifp->flags&IFA_F_TEMPORARY) {
1143                 list_del(&ifp->tmp_list);
1144                 if (ifp->ifpub) {
1145                         in6_ifa_put(ifp->ifpub);
1146                         ifp->ifpub = NULL;
1147                 }
1148                 __in6_ifa_put(ifp);
1149         }
1150
1151         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1152                 action = check_cleanup_prefix_route(ifp, &expires);
1153
1154         list_del_init(&ifp->if_list);
1155         __in6_ifa_put(ifp);
1156
1157         write_unlock_bh(&ifp->idev->lock);
1158
1159         addrconf_del_dad_work(ifp);
1160
1161         ipv6_ifa_notify(RTM_DELADDR, ifp);
1162
1163         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1164
1165         if (action != CLEANUP_PREFIX_RT_NOP) {
1166                 cleanup_prefix_route(ifp, expires,
1167                         action == CLEANUP_PREFIX_RT_DEL);
1168         }
1169
1170         /* clean up prefsrc entries */
1171         rt6_remove_prefsrc(ifp);
1172 out:
1173         in6_ifa_put(ifp);
1174 }
1175
1176 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1177 {
1178         struct inet6_dev *idev = ifp->idev;
1179         struct in6_addr addr, *tmpaddr;
1180         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1181         unsigned long regen_advance;
1182         int tmp_plen;
1183         int ret = 0;
1184         u32 addr_flags;
1185         unsigned long now = jiffies;
1186
1187         write_lock_bh(&idev->lock);
1188         if (ift) {
1189                 spin_lock_bh(&ift->lock);
1190                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1191                 spin_unlock_bh(&ift->lock);
1192                 tmpaddr = &addr;
1193         } else {
1194                 tmpaddr = NULL;
1195         }
1196 retry:
1197         in6_dev_hold(idev);
1198         if (idev->cnf.use_tempaddr <= 0) {
1199                 write_unlock_bh(&idev->lock);
1200                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1201                 in6_dev_put(idev);
1202                 ret = -1;
1203                 goto out;
1204         }
1205         spin_lock_bh(&ifp->lock);
1206         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1207                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1208                 spin_unlock_bh(&ifp->lock);
1209                 write_unlock_bh(&idev->lock);
1210                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1211                         __func__);
1212                 in6_dev_put(idev);
1213                 ret = -1;
1214                 goto out;
1215         }
1216         in6_ifa_hold(ifp);
1217         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1218         __ipv6_try_regen_rndid(idev, tmpaddr);
1219         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1220         age = (now - ifp->tstamp) / HZ;
1221         tmp_valid_lft = min_t(__u32,
1222                               ifp->valid_lft,
1223                               idev->cnf.temp_valid_lft + age);
1224         tmp_prefered_lft = min_t(__u32,
1225                                  ifp->prefered_lft,
1226                                  idev->cnf.temp_prefered_lft + age -
1227                                  idev->cnf.max_desync_factor);
1228         tmp_plen = ifp->prefix_len;
1229         tmp_tstamp = ifp->tstamp;
1230         spin_unlock_bh(&ifp->lock);
1231
1232         regen_advance = idev->cnf.regen_max_retry *
1233                         idev->cnf.dad_transmits *
1234                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1235         write_unlock_bh(&idev->lock);
1236
1237         /* A temporary address is created only if this calculated Preferred
1238          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1239          * an implementation must not create a temporary address with a zero
1240          * Preferred Lifetime.
1241          * Use age calculation as in addrconf_verify to avoid unnecessary
1242          * temporary addresses being generated.
1243          */
1244         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1245         if (tmp_prefered_lft <= regen_advance + age) {
1246                 in6_ifa_put(ifp);
1247                 in6_dev_put(idev);
1248                 ret = -1;
1249                 goto out;
1250         }
1251
1252         addr_flags = IFA_F_TEMPORARY;
1253         /* set in addrconf_prefix_rcv() */
1254         if (ifp->flags & IFA_F_OPTIMISTIC)
1255                 addr_flags |= IFA_F_OPTIMISTIC;
1256
1257         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1258                             ipv6_addr_scope(&addr), addr_flags,
1259                             tmp_valid_lft, tmp_prefered_lft);
1260         if (IS_ERR(ift)) {
1261                 in6_ifa_put(ifp);
1262                 in6_dev_put(idev);
1263                 pr_info("%s: retry temporary address regeneration\n", __func__);
1264                 tmpaddr = &addr;
1265                 write_lock_bh(&idev->lock);
1266                 goto retry;
1267         }
1268
1269         spin_lock_bh(&ift->lock);
1270         ift->ifpub = ifp;
1271         ift->cstamp = now;
1272         ift->tstamp = tmp_tstamp;
1273         spin_unlock_bh(&ift->lock);
1274
1275         addrconf_dad_start(ift);
1276         in6_ifa_put(ift);
1277         in6_dev_put(idev);
1278 out:
1279         return ret;
1280 }
1281
1282 /*
1283  *      Choose an appropriate source address (RFC3484)
1284  */
1285 enum {
1286         IPV6_SADDR_RULE_INIT = 0,
1287         IPV6_SADDR_RULE_LOCAL,
1288         IPV6_SADDR_RULE_SCOPE,
1289         IPV6_SADDR_RULE_PREFERRED,
1290 #ifdef CONFIG_IPV6_MIP6
1291         IPV6_SADDR_RULE_HOA,
1292 #endif
1293         IPV6_SADDR_RULE_OIF,
1294         IPV6_SADDR_RULE_LABEL,
1295         IPV6_SADDR_RULE_PRIVACY,
1296         IPV6_SADDR_RULE_ORCHID,
1297         IPV6_SADDR_RULE_PREFIX,
1298 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1299         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1300 #endif
1301         IPV6_SADDR_RULE_MAX
1302 };
1303
1304 struct ipv6_saddr_score {
1305         int                     rule;
1306         int                     addr_type;
1307         struct inet6_ifaddr     *ifa;
1308         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1309         int                     scopedist;
1310         int                     matchlen;
1311 };
1312
1313 struct ipv6_saddr_dst {
1314         const struct in6_addr *addr;
1315         int ifindex;
1316         int scope;
1317         int label;
1318         unsigned int prefs;
1319 };
1320
1321 static inline int ipv6_saddr_preferred(int type)
1322 {
1323         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1324                 return 1;
1325         return 0;
1326 }
1327
1328 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1329 {
1330 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1331         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1332 #else
1333         return false;
1334 #endif
1335 }
1336
1337 static int ipv6_get_saddr_eval(struct net *net,
1338                                struct ipv6_saddr_score *score,
1339                                struct ipv6_saddr_dst *dst,
1340                                int i)
1341 {
1342         int ret;
1343
1344         if (i <= score->rule) {
1345                 switch (i) {
1346                 case IPV6_SADDR_RULE_SCOPE:
1347                         ret = score->scopedist;
1348                         break;
1349                 case IPV6_SADDR_RULE_PREFIX:
1350                         ret = score->matchlen;
1351                         break;
1352                 default:
1353                         ret = !!test_bit(i, score->scorebits);
1354                 }
1355                 goto out;
1356         }
1357
1358         switch (i) {
1359         case IPV6_SADDR_RULE_INIT:
1360                 /* Rule 0: remember if hiscore is not ready yet */
1361                 ret = !!score->ifa;
1362                 break;
1363         case IPV6_SADDR_RULE_LOCAL:
1364                 /* Rule 1: Prefer same address */
1365                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1366                 break;
1367         case IPV6_SADDR_RULE_SCOPE:
1368                 /* Rule 2: Prefer appropriate scope
1369                  *
1370                  *      ret
1371                  *       ^
1372                  *    -1 |  d 15
1373                  *    ---+--+-+---> scope
1374                  *       |
1375                  *       |             d is scope of the destination.
1376                  *  B-d  |  \
1377                  *       |   \      <- smaller scope is better if
1378                  *  B-15 |    \        if scope is enough for destination.
1379                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1380                  * d-C-1 | /
1381                  *       |/         <- greater is better
1382                  *   -C  /             if scope is not enough for destination.
1383                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1384                  *
1385                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1386                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1387                  * Assume B = 0 and we get C > 29.
1388                  */
1389                 ret = __ipv6_addr_src_scope(score->addr_type);
1390                 if (ret >= dst->scope)
1391                         ret = -ret;
1392                 else
1393                         ret -= 128;     /* 30 is enough */
1394                 score->scopedist = ret;
1395                 break;
1396         case IPV6_SADDR_RULE_PREFERRED:
1397             {
1398                 /* Rule 3: Avoid deprecated and optimistic addresses */
1399                 u8 avoid = IFA_F_DEPRECATED;
1400
1401                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1402                         avoid |= IFA_F_OPTIMISTIC;
1403                 ret = ipv6_saddr_preferred(score->addr_type) ||
1404                       !(score->ifa->flags & avoid);
1405                 break;
1406             }
1407 #ifdef CONFIG_IPV6_MIP6
1408         case IPV6_SADDR_RULE_HOA:
1409             {
1410                 /* Rule 4: Prefer home address */
1411                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1412                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1413                 break;
1414             }
1415 #endif
1416         case IPV6_SADDR_RULE_OIF:
1417                 /* Rule 5: Prefer outgoing interface */
1418                 ret = (!dst->ifindex ||
1419                        dst->ifindex == score->ifa->idev->dev->ifindex);
1420                 break;
1421         case IPV6_SADDR_RULE_LABEL:
1422                 /* Rule 6: Prefer matching label */
1423                 ret = ipv6_addr_label(net,
1424                                       &score->ifa->addr, score->addr_type,
1425                                       score->ifa->idev->dev->ifindex) == dst->label;
1426                 break;
1427         case IPV6_SADDR_RULE_PRIVACY:
1428             {
1429                 /* Rule 7: Prefer public address
1430                  * Note: prefer temporary address if use_tempaddr >= 2
1431                  */
1432                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1433                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1434                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1435                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1436                 break;
1437             }
1438         case IPV6_SADDR_RULE_ORCHID:
1439                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1440                  *          non-ORCHID vs non-ORCHID
1441                  */
1442                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1443                         ipv6_addr_orchid(dst->addr));
1444                 break;
1445         case IPV6_SADDR_RULE_PREFIX:
1446                 /* Rule 8: Use longest matching prefix */
1447                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1448                 if (ret > score->ifa->prefix_len)
1449                         ret = score->ifa->prefix_len;
1450                 score->matchlen = ret;
1451                 break;
1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1453         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1454                 /* Optimistic addresses still have lower precedence than other
1455                  * preferred addresses.
1456                  */
1457                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1458                 break;
1459 #endif
1460         default:
1461                 ret = 0;
1462         }
1463
1464         if (ret)
1465                 __set_bit(i, score->scorebits);
1466         score->rule = i;
1467 out:
1468         return ret;
1469 }
1470
1471 static int __ipv6_dev_get_saddr(struct net *net,
1472                                 struct ipv6_saddr_dst *dst,
1473                                 struct inet6_dev *idev,
1474                                 struct ipv6_saddr_score *scores,
1475                                 int hiscore_idx)
1476 {
1477         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1478
1479         read_lock_bh(&idev->lock);
1480         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1481                 int i;
1482
1483                 /*
1484                  * - Tentative Address (RFC2462 section 5.4)
1485                  *  - A tentative address is not considered
1486                  *    "assigned to an interface" in the traditional
1487                  *    sense, unless it is also flagged as optimistic.
1488                  * - Candidate Source Address (section 4)
1489                  *  - In any case, anycast addresses, multicast
1490                  *    addresses, and the unspecified address MUST
1491                  *    NOT be included in a candidate set.
1492                  */
1493                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1494                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1495                         continue;
1496
1497                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1498
1499                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1500                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1501                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1502                                             idev->dev->name);
1503                         continue;
1504                 }
1505
1506                 score->rule = -1;
1507                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1508
1509                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1510                         int minihiscore, miniscore;
1511
1512                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1513                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1514
1515                         if (minihiscore > miniscore) {
1516                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1517                                     score->scopedist > 0) {
1518                                         /*
1519                                          * special case:
1520                                          * each remaining entry
1521                                          * has too small (not enough)
1522                                          * scope, because ifa entries
1523                                          * are sorted by their scope
1524                                          * values.
1525                                          */
1526                                         goto out;
1527                                 }
1528                                 break;
1529                         } else if (minihiscore < miniscore) {
1530                                 if (hiscore->ifa)
1531                                         in6_ifa_put(hiscore->ifa);
1532
1533                                 in6_ifa_hold(score->ifa);
1534
1535                                 swap(hiscore, score);
1536                                 hiscore_idx = 1 - hiscore_idx;
1537
1538                                 /* restore our iterator */
1539                                 score->ifa = hiscore->ifa;
1540
1541                                 break;
1542                         }
1543                 }
1544         }
1545 out:
1546         read_unlock_bh(&idev->lock);
1547         return hiscore_idx;
1548 }
1549
1550 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1551                        const struct in6_addr *daddr, unsigned int prefs,
1552                        struct in6_addr *saddr)
1553 {
1554         struct ipv6_saddr_score scores[2], *hiscore;
1555         struct ipv6_saddr_dst dst;
1556         struct inet6_dev *idev;
1557         struct net_device *dev;
1558         int dst_type;
1559         bool use_oif_addr = false;
1560         int hiscore_idx = 0;
1561
1562         dst_type = __ipv6_addr_type(daddr);
1563         dst.addr = daddr;
1564         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1565         dst.scope = __ipv6_addr_src_scope(dst_type);
1566         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1567         dst.prefs = prefs;
1568
1569         scores[hiscore_idx].rule = -1;
1570         scores[hiscore_idx].ifa = NULL;
1571
1572         rcu_read_lock();
1573
1574         /* Candidate Source Address (section 4)
1575          *  - multicast and link-local destination address,
1576          *    the set of candidate source address MUST only
1577          *    include addresses assigned to interfaces
1578          *    belonging to the same link as the outgoing
1579          *    interface.
1580          * (- For site-local destination addresses, the
1581          *    set of candidate source addresses MUST only
1582          *    include addresses assigned to interfaces
1583          *    belonging to the same site as the outgoing
1584          *    interface.)
1585          *  - "It is RECOMMENDED that the candidate source addresses
1586          *    be the set of unicast addresses assigned to the
1587          *    interface that will be used to send to the destination
1588          *    (the 'outgoing' interface)." (RFC 6724)
1589          */
1590         if (dst_dev) {
1591                 idev = __in6_dev_get(dst_dev);
1592                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1593                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1594                     (idev && idev->cnf.use_oif_addrs_only)) {
1595                         use_oif_addr = true;
1596                 }
1597         }
1598
1599         if (use_oif_addr) {
1600                 if (idev)
1601                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1602         } else {
1603                 for_each_netdev_rcu(net, dev) {
1604                         idev = __in6_dev_get(dev);
1605                         if (!idev)
1606                                 continue;
1607                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1608                 }
1609         }
1610         rcu_read_unlock();
1611
1612         hiscore = &scores[hiscore_idx];
1613         if (!hiscore->ifa)
1614                 return -EADDRNOTAVAIL;
1615
1616         *saddr = hiscore->ifa->addr;
1617         in6_ifa_put(hiscore->ifa);
1618         return 0;
1619 }
1620 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1621
1622 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1623                       u32 banned_flags)
1624 {
1625         struct inet6_ifaddr *ifp;
1626         int err = -EADDRNOTAVAIL;
1627
1628         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1629                 if (ifp->scope > IFA_LINK)
1630                         break;
1631                 if (ifp->scope == IFA_LINK &&
1632                     !(ifp->flags & banned_flags)) {
1633                         *addr = ifp->addr;
1634                         err = 0;
1635                         break;
1636                 }
1637         }
1638         return err;
1639 }
1640
1641 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1642                     u32 banned_flags)
1643 {
1644         struct inet6_dev *idev;
1645         int err = -EADDRNOTAVAIL;
1646
1647         rcu_read_lock();
1648         idev = __in6_dev_get(dev);
1649         if (idev) {
1650                 read_lock_bh(&idev->lock);
1651                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1652                 read_unlock_bh(&idev->lock);
1653         }
1654         rcu_read_unlock();
1655         return err;
1656 }
1657
1658 static int ipv6_count_addresses(struct inet6_dev *idev)
1659 {
1660         int cnt = 0;
1661         struct inet6_ifaddr *ifp;
1662
1663         read_lock_bh(&idev->lock);
1664         list_for_each_entry(ifp, &idev->addr_list, if_list)
1665                 cnt++;
1666         read_unlock_bh(&idev->lock);
1667         return cnt;
1668 }
1669
1670 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1671                   const struct net_device *dev, int strict)
1672 {
1673         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1674 }
1675 EXPORT_SYMBOL(ipv6_chk_addr);
1676
1677 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1678                             const struct net_device *dev, int strict,
1679                             u32 banned_flags)
1680 {
1681         struct inet6_ifaddr *ifp;
1682         unsigned int hash = inet6_addr_hash(addr);
1683         u32 ifp_flags;
1684
1685         rcu_read_lock_bh();
1686         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1687                 if (!net_eq(dev_net(ifp->idev->dev), net))
1688                         continue;
1689                 /* Decouple optimistic from tentative for evaluation here.
1690                  * Ban optimistic addresses explicitly, when required.
1691                  */
1692                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1693                             ? (ifp->flags&~IFA_F_TENTATIVE)
1694                             : ifp->flags;
1695                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1696                     !(ifp_flags&banned_flags) &&
1697                     (!dev || ifp->idev->dev == dev ||
1698                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1699                         rcu_read_unlock_bh();
1700                         return 1;
1701                 }
1702         }
1703
1704         rcu_read_unlock_bh();
1705         return 0;
1706 }
1707 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1708
1709 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1710                                struct net_device *dev)
1711 {
1712         unsigned int hash = inet6_addr_hash(addr);
1713         struct inet6_ifaddr *ifp;
1714
1715         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1716                 if (!net_eq(dev_net(ifp->idev->dev), net))
1717                         continue;
1718                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1719                         if (!dev || ifp->idev->dev == dev)
1720                                 return true;
1721                 }
1722         }
1723         return false;
1724 }
1725
1726 /* Compares an address/prefix_len with addresses on device @dev.
1727  * If one is found it returns true.
1728  */
1729 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1730         const unsigned int prefix_len, struct net_device *dev)
1731 {
1732         struct inet6_dev *idev;
1733         struct inet6_ifaddr *ifa;
1734         bool ret = false;
1735
1736         rcu_read_lock();
1737         idev = __in6_dev_get(dev);
1738         if (idev) {
1739                 read_lock_bh(&idev->lock);
1740                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1741                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1742                         if (ret)
1743                                 break;
1744                 }
1745                 read_unlock_bh(&idev->lock);
1746         }
1747         rcu_read_unlock();
1748
1749         return ret;
1750 }
1751 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1752
1753 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1754 {
1755         struct inet6_dev *idev;
1756         struct inet6_ifaddr *ifa;
1757         int     onlink;
1758
1759         onlink = 0;
1760         rcu_read_lock();
1761         idev = __in6_dev_get(dev);
1762         if (idev) {
1763                 read_lock_bh(&idev->lock);
1764                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1765                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1766                                                    ifa->prefix_len);
1767                         if (onlink)
1768                                 break;
1769                 }
1770                 read_unlock_bh(&idev->lock);
1771         }
1772         rcu_read_unlock();
1773         return onlink;
1774 }
1775 EXPORT_SYMBOL(ipv6_chk_prefix);
1776
1777 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1778                                      struct net_device *dev, int strict)
1779 {
1780         struct inet6_ifaddr *ifp, *result = NULL;
1781         unsigned int hash = inet6_addr_hash(addr);
1782
1783         rcu_read_lock_bh();
1784         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1785                 if (!net_eq(dev_net(ifp->idev->dev), net))
1786                         continue;
1787                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1788                         if (!dev || ifp->idev->dev == dev ||
1789                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1790                                 result = ifp;
1791                                 in6_ifa_hold(ifp);
1792                                 break;
1793                         }
1794                 }
1795         }
1796         rcu_read_unlock_bh();
1797
1798         return result;
1799 }
1800
1801 /* Gets referenced address, destroys ifaddr */
1802
1803 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1804 {
1805         if (ifp->flags&IFA_F_TEMPORARY) {
1806                 struct inet6_ifaddr *ifpub;
1807                 spin_lock_bh(&ifp->lock);
1808                 ifpub = ifp->ifpub;
1809                 if (ifpub) {
1810                         in6_ifa_hold(ifpub);
1811                         spin_unlock_bh(&ifp->lock);
1812                         ipv6_create_tempaddr(ifpub, ifp);
1813                         in6_ifa_put(ifpub);
1814                 } else {
1815                         spin_unlock_bh(&ifp->lock);
1816                 }
1817                 ipv6_del_addr(ifp);
1818         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1819                 spin_lock_bh(&ifp->lock);
1820                 addrconf_del_dad_work(ifp);
1821                 ifp->flags |= IFA_F_TENTATIVE;
1822                 if (dad_failed)
1823                         ifp->flags |= IFA_F_DADFAILED;
1824                 spin_unlock_bh(&ifp->lock);
1825                 if (dad_failed)
1826                         ipv6_ifa_notify(0, ifp);
1827                 in6_ifa_put(ifp);
1828         } else {
1829                 ipv6_del_addr(ifp);
1830         }
1831 }
1832
1833 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1834 {
1835         int err = -ENOENT;
1836
1837         spin_lock_bh(&ifp->lock);
1838         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1839                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1840                 err = 0;
1841         }
1842         spin_unlock_bh(&ifp->lock);
1843
1844         return err;
1845 }
1846
1847 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1848 {
1849         struct in6_addr addr;
1850         struct inet6_dev *idev = ifp->idev;
1851         struct net *net = dev_net(ifp->idev->dev);
1852
1853         if (addrconf_dad_end(ifp)) {
1854                 in6_ifa_put(ifp);
1855                 return;
1856         }
1857
1858         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1859                              ifp->idev->dev->name, &ifp->addr);
1860
1861         spin_lock_bh(&ifp->lock);
1862
1863         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1864                 int scope = ifp->scope;
1865                 u32 flags = ifp->flags;
1866                 struct in6_addr new_addr;
1867                 struct inet6_ifaddr *ifp2;
1868                 u32 valid_lft, preferred_lft;
1869                 int pfxlen = ifp->prefix_len;
1870                 int retries = ifp->stable_privacy_retry + 1;
1871
1872                 if (retries > net->ipv6.sysctl.idgen_retries) {
1873                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1874                                              ifp->idev->dev->name);
1875                         goto errdad;
1876                 }
1877
1878                 new_addr = ifp->addr;
1879                 if (ipv6_generate_stable_address(&new_addr, retries,
1880                                                  idev))
1881                         goto errdad;
1882
1883                 valid_lft = ifp->valid_lft;
1884                 preferred_lft = ifp->prefered_lft;
1885
1886                 spin_unlock_bh(&ifp->lock);
1887
1888                 if (idev->cnf.max_addresses &&
1889                     ipv6_count_addresses(idev) >=
1890                     idev->cnf.max_addresses)
1891                         goto lock_errdad;
1892
1893                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1894                                      ifp->idev->dev->name);
1895
1896                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1897                                      scope, flags, valid_lft,
1898                                      preferred_lft);
1899                 if (IS_ERR(ifp2))
1900                         goto lock_errdad;
1901
1902                 spin_lock_bh(&ifp2->lock);
1903                 ifp2->stable_privacy_retry = retries;
1904                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1905                 spin_unlock_bh(&ifp2->lock);
1906
1907                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1908                 in6_ifa_put(ifp2);
1909 lock_errdad:
1910                 spin_lock_bh(&ifp->lock);
1911         } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1912                 addr.s6_addr32[0] = htonl(0xfe800000);
1913                 addr.s6_addr32[1] = 0;
1914
1915                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1916                     ipv6_addr_equal(&ifp->addr, &addr)) {
1917                         /* DAD failed for link-local based on MAC address */
1918                         idev->cnf.disable_ipv6 = 1;
1919
1920                         pr_info("%s: IPv6 being disabled!\n",
1921                                 ifp->idev->dev->name);
1922                 }
1923         }
1924
1925 errdad:
1926         /* transition from _POSTDAD to _ERRDAD */
1927         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1928         spin_unlock_bh(&ifp->lock);
1929
1930         addrconf_mod_dad_work(ifp, 0);
1931         in6_ifa_put(ifp);
1932 }
1933
1934 /* Join to solicited addr multicast group.
1935  * caller must hold RTNL */
1936 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1937 {
1938         struct in6_addr maddr;
1939
1940         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1941                 return;
1942
1943         addrconf_addr_solict_mult(addr, &maddr);
1944         ipv6_dev_mc_inc(dev, &maddr);
1945 }
1946
1947 /* caller must hold RTNL */
1948 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1949 {
1950         struct in6_addr maddr;
1951
1952         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1953                 return;
1954
1955         addrconf_addr_solict_mult(addr, &maddr);
1956         __ipv6_dev_mc_dec(idev, &maddr);
1957 }
1958
1959 /* caller must hold RTNL */
1960 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1961 {
1962         struct in6_addr addr;
1963
1964         if (ifp->prefix_len >= 127) /* RFC 6164 */
1965                 return;
1966         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1967         if (ipv6_addr_any(&addr))
1968                 return;
1969         __ipv6_dev_ac_inc(ifp->idev, &addr);
1970 }
1971
1972 /* caller must hold RTNL */
1973 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1974 {
1975         struct in6_addr addr;
1976
1977         if (ifp->prefix_len >= 127) /* RFC 6164 */
1978                 return;
1979         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1980         if (ipv6_addr_any(&addr))
1981                 return;
1982         __ipv6_dev_ac_dec(ifp->idev, &addr);
1983 }
1984
1985 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1986 {
1987         if (dev->addr_len != IEEE802154_ADDR_LEN)
1988                 return -1;
1989         memcpy(eui, dev->dev_addr, 8);
1990         eui[0] ^= 2;
1991         return 0;
1992 }
1993
1994 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1995 {
1996         union fwnet_hwaddr *ha;
1997
1998         if (dev->addr_len != FWNET_ALEN)
1999                 return -1;
2000
2001         ha = (union fwnet_hwaddr *)dev->dev_addr;
2002
2003         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2004         eui[0] ^= 2;
2005         return 0;
2006 }
2007
2008 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2009 {
2010         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2011         if (dev->addr_len != ARCNET_ALEN)
2012                 return -1;
2013         memset(eui, 0, 7);
2014         eui[7] = *(u8 *)dev->dev_addr;
2015         return 0;
2016 }
2017
2018 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2019 {
2020         if (dev->addr_len != INFINIBAND_ALEN)
2021                 return -1;
2022         memcpy(eui, dev->dev_addr + 12, 8);
2023         eui[0] |= 2;
2024         return 0;
2025 }
2026
2027 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2028 {
2029         if (addr == 0)
2030                 return -1;
2031         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2032                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2033                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2034                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2035                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2036                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2037         eui[1] = 0;
2038         eui[2] = 0x5E;
2039         eui[3] = 0xFE;
2040         memcpy(eui + 4, &addr, 4);
2041         return 0;
2042 }
2043
2044 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2045 {
2046         if (dev->priv_flags & IFF_ISATAP)
2047                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2048         return -1;
2049 }
2050
2051 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2052 {
2053         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2054 }
2055
2056 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2057 {
2058         memcpy(eui, dev->perm_addr, 3);
2059         memcpy(eui + 5, dev->perm_addr + 3, 3);
2060         eui[3] = 0xFF;
2061         eui[4] = 0xFE;
2062         eui[0] ^= 2;
2063         return 0;
2064 }
2065
2066 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2067 {
2068         switch (dev->type) {
2069         case ARPHRD_ETHER:
2070         case ARPHRD_FDDI:
2071                 return addrconf_ifid_eui48(eui, dev);
2072         case ARPHRD_ARCNET:
2073                 return addrconf_ifid_arcnet(eui, dev);
2074         case ARPHRD_INFINIBAND:
2075                 return addrconf_ifid_infiniband(eui, dev);
2076         case ARPHRD_SIT:
2077                 return addrconf_ifid_sit(eui, dev);
2078         case ARPHRD_IPGRE:
2079                 return addrconf_ifid_gre(eui, dev);
2080         case ARPHRD_6LOWPAN:
2081         case ARPHRD_IEEE802154:
2082                 return addrconf_ifid_eui64(eui, dev);
2083         case ARPHRD_IEEE1394:
2084                 return addrconf_ifid_ieee1394(eui, dev);
2085         case ARPHRD_TUNNEL6:
2086                 return addrconf_ifid_ip6tnl(eui, dev);
2087         }
2088         return -1;
2089 }
2090
2091 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2092 {
2093         int err = -1;
2094         struct inet6_ifaddr *ifp;
2095
2096         read_lock_bh(&idev->lock);
2097         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2098                 if (ifp->scope > IFA_LINK)
2099                         break;
2100                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2101                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2102                         err = 0;
2103                         break;
2104                 }
2105         }
2106         read_unlock_bh(&idev->lock);
2107         return err;
2108 }
2109
2110 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2111 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2112 {
2113 regen:
2114         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2115         idev->rndid[0] &= ~0x02;
2116
2117         /*
2118          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2119          * check if generated address is not inappropriate
2120          *
2121          *  - Reserved subnet anycast (RFC 2526)
2122          *      11111101 11....11 1xxxxxxx
2123          *  - ISATAP (RFC4214) 6.1
2124          *      00-00-5E-FE-xx-xx-xx-xx
2125          *  - value 0
2126          *  - XXX: already assigned to an address on the device
2127          */
2128         if (idev->rndid[0] == 0xfd &&
2129             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2130             (idev->rndid[7]&0x80))
2131                 goto regen;
2132         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2133                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2134                         goto regen;
2135                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2136                         goto regen;
2137         }
2138 }
2139
2140 static void ipv6_regen_rndid(unsigned long data)
2141 {
2142         struct inet6_dev *idev = (struct inet6_dev *) data;
2143         unsigned long expires;
2144
2145         rcu_read_lock_bh();
2146         write_lock_bh(&idev->lock);
2147
2148         if (idev->dead)
2149                 goto out;
2150
2151         __ipv6_regen_rndid(idev);
2152
2153         expires = jiffies +
2154                 idev->cnf.temp_prefered_lft * HZ -
2155                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2156                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2157                 idev->cnf.max_desync_factor * HZ;
2158         if (time_before(expires, jiffies)) {
2159                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2160                         __func__, idev->dev->name);
2161                 goto out;
2162         }
2163
2164         if (!mod_timer(&idev->regen_timer, expires))
2165                 in6_dev_hold(idev);
2166
2167 out:
2168         write_unlock_bh(&idev->lock);
2169         rcu_read_unlock_bh();
2170         in6_dev_put(idev);
2171 }
2172
2173 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2174 {
2175         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2176                 __ipv6_regen_rndid(idev);
2177 }
2178
2179 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table) {
2180         /* Determines into what table to put autoconf PIO/RIO/default routes
2181          * learned on this device.
2182          *
2183          * - If 0, use the same table for every device. This puts routes into
2184          *   one of RT_TABLE_{PREFIX,INFO,DFLT} depending on the type of route
2185          *   (but note that these three are currently all equal to
2186          *   RT6_TABLE_MAIN).
2187          * - If > 0, use the specified table.
2188          * - If < 0, put routes into table dev->ifindex + (-rt_table).
2189          */
2190         struct inet6_dev *idev = in6_dev_get(dev);
2191         u32 table;
2192         int sysctl = idev->cnf.accept_ra_rt_table;
2193         if (sysctl == 0) {
2194                 table = default_table;
2195         } else if (sysctl > 0) {
2196                 table = (u32) sysctl;
2197         } else {
2198                 table = (unsigned) dev->ifindex + (-sysctl);
2199         }
2200         in6_dev_put(idev);
2201         return table;
2202 }
2203
2204 /*
2205  *      Add prefix route.
2206  */
2207
2208 static void
2209 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2210                       unsigned long expires, u32 flags)
2211 {
2212         struct fib6_config cfg = {
2213                 .fc_table = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX),
2214                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2215                 .fc_ifindex = dev->ifindex,
2216                 .fc_expires = expires,
2217                 .fc_dst_len = plen,
2218                 .fc_flags = RTF_UP | flags,
2219                 .fc_nlinfo.nl_net = dev_net(dev),
2220                 .fc_protocol = RTPROT_KERNEL,
2221         };
2222
2223         cfg.fc_dst = *pfx;
2224
2225         /* Prevent useless cloning on PtP SIT.
2226            This thing is done here expecting that the whole
2227            class of non-broadcast devices need not cloning.
2228          */
2229 #if IS_ENABLED(CONFIG_IPV6_SIT)
2230         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2231                 cfg.fc_flags |= RTF_NONEXTHOP;
2232 #endif
2233
2234         ip6_route_add(&cfg);
2235 }
2236
2237
2238 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2239                                                   int plen,
2240                                                   const struct net_device *dev,
2241                                                   u32 flags, u32 noflags)
2242 {
2243         struct fib6_node *fn;
2244         struct rt6_info *rt = NULL;
2245         struct fib6_table *table;
2246         u32 tb_id = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX);
2247
2248         table = fib6_get_table(dev_net(dev), tb_id);
2249         if (!table)
2250                 return NULL;
2251
2252         read_lock_bh(&table->tb6_lock);
2253         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2254         if (!fn)
2255                 goto out;
2256
2257         noflags |= RTF_CACHE;
2258         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2259                 if (rt->dst.dev->ifindex != dev->ifindex)
2260                         continue;
2261                 if ((rt->rt6i_flags & flags) != flags)
2262                         continue;
2263                 if ((rt->rt6i_flags & noflags) != 0)
2264                         continue;
2265                 dst_hold(&rt->dst);
2266                 break;
2267         }
2268 out:
2269         read_unlock_bh(&table->tb6_lock);
2270         return rt;
2271 }
2272
2273
2274 /* Create "default" multicast route to the interface */
2275
2276 static void addrconf_add_mroute(struct net_device *dev)
2277 {
2278         struct fib6_config cfg = {
2279                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2280                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2281                 .fc_ifindex = dev->ifindex,
2282                 .fc_dst_len = 8,
2283                 .fc_flags = RTF_UP,
2284                 .fc_nlinfo.nl_net = dev_net(dev),
2285         };
2286
2287         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2288
2289         ip6_route_add(&cfg);
2290 }
2291
2292 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2293 {
2294         struct inet6_dev *idev;
2295
2296         ASSERT_RTNL();
2297
2298         idev = ipv6_find_idev(dev);
2299         if (!idev)
2300                 return ERR_PTR(-ENOBUFS);
2301
2302         if (idev->cnf.disable_ipv6)
2303                 return ERR_PTR(-EACCES);
2304
2305         /* Add default multicast route */
2306         if (!(dev->flags & IFF_LOOPBACK))
2307                 addrconf_add_mroute(dev);
2308
2309         return idev;
2310 }
2311
2312 static void manage_tempaddrs(struct inet6_dev *idev,
2313                              struct inet6_ifaddr *ifp,
2314                              __u32 valid_lft, __u32 prefered_lft,
2315                              bool create, unsigned long now)
2316 {
2317         u32 flags;
2318         struct inet6_ifaddr *ift;
2319
2320         read_lock_bh(&idev->lock);
2321         /* update all temporary addresses in the list */
2322         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2323                 int age, max_valid, max_prefered;
2324
2325                 if (ifp != ift->ifpub)
2326                         continue;
2327
2328                 /* RFC 4941 section 3.3:
2329                  * If a received option will extend the lifetime of a public
2330                  * address, the lifetimes of temporary addresses should
2331                  * be extended, subject to the overall constraint that no
2332                  * temporary addresses should ever remain "valid" or "preferred"
2333                  * for a time longer than (TEMP_VALID_LIFETIME) or
2334                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2335                  */
2336                 age = (now - ift->cstamp) / HZ;
2337                 max_valid = idev->cnf.temp_valid_lft - age;
2338                 if (max_valid < 0)
2339                         max_valid = 0;
2340
2341                 max_prefered = idev->cnf.temp_prefered_lft -
2342                                idev->cnf.max_desync_factor - age;
2343                 if (max_prefered < 0)
2344                         max_prefered = 0;
2345
2346                 if (valid_lft > max_valid)
2347                         valid_lft = max_valid;
2348
2349                 if (prefered_lft > max_prefered)
2350                         prefered_lft = max_prefered;
2351
2352                 spin_lock(&ift->lock);
2353                 flags = ift->flags;
2354                 ift->valid_lft = valid_lft;
2355                 ift->prefered_lft = prefered_lft;
2356                 ift->tstamp = now;
2357                 if (prefered_lft > 0)
2358                         ift->flags &= ~IFA_F_DEPRECATED;
2359
2360                 spin_unlock(&ift->lock);
2361                 if (!(flags&IFA_F_TENTATIVE))
2362                         ipv6_ifa_notify(0, ift);
2363         }
2364
2365         if ((create || list_empty(&idev->tempaddr_list)) &&
2366             idev->cnf.use_tempaddr > 0) {
2367                 /* When a new public address is created as described
2368                  * in [ADDRCONF], also create a new temporary address.
2369                  * Also create a temporary address if it's enabled but
2370                  * no temporary address currently exists.
2371                  */
2372                 read_unlock_bh(&idev->lock);
2373                 ipv6_create_tempaddr(ifp, NULL);
2374         } else {
2375                 read_unlock_bh(&idev->lock);
2376         }
2377 }
2378
2379 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2380 {
2381         struct prefix_info *pinfo;
2382         __u32 valid_lft;
2383         __u32 prefered_lft;
2384         int addr_type;
2385         u32 addr_flags = 0;
2386         struct inet6_dev *in6_dev;
2387         struct net *net = dev_net(dev);
2388
2389         pinfo = (struct prefix_info *) opt;
2390
2391         if (len < sizeof(struct prefix_info)) {
2392                 ADBG("addrconf: prefix option too short\n");
2393                 return;
2394         }
2395
2396         /*
2397          *      Validation checks ([ADDRCONF], page 19)
2398          */
2399
2400         addr_type = ipv6_addr_type(&pinfo->prefix);
2401
2402         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2403                 return;
2404
2405         valid_lft = ntohl(pinfo->valid);
2406         prefered_lft = ntohl(pinfo->prefered);
2407
2408         if (prefered_lft > valid_lft) {
2409                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2410                 return;
2411         }
2412
2413         in6_dev = in6_dev_get(dev);
2414
2415         if (!in6_dev) {
2416                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2417                                     dev->name);
2418                 return;
2419         }
2420
2421         /*
2422          *      Two things going on here:
2423          *      1) Add routes for on-link prefixes
2424          *      2) Configure prefixes with the auto flag set
2425          */
2426
2427         if (pinfo->onlink) {
2428                 struct rt6_info *rt;
2429                 unsigned long rt_expires;
2430
2431                 /* Avoid arithmetic overflow. Really, we could
2432                  * save rt_expires in seconds, likely valid_lft,
2433                  * but it would require division in fib gc, that it
2434                  * not good.
2435                  */
2436                 if (HZ > USER_HZ)
2437                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2438                 else
2439                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2440
2441                 if (addrconf_finite_timeout(rt_expires))
2442                         rt_expires *= HZ;
2443
2444                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2445                                                pinfo->prefix_len,
2446                                                dev,
2447                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2448                                                RTF_GATEWAY | RTF_DEFAULT);
2449
2450                 if (rt) {
2451                         /* Autoconf prefix route */
2452                         if (valid_lft == 0) {
2453                                 ip6_del_rt(rt);
2454                                 rt = NULL;
2455                         } else if (addrconf_finite_timeout(rt_expires)) {
2456                                 /* not infinity */
2457                                 rt6_set_expires(rt, jiffies + rt_expires);
2458                         } else {
2459                                 rt6_clean_expires(rt);
2460                         }
2461                 } else if (valid_lft) {
2462                         clock_t expires = 0;
2463                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2464                         if (addrconf_finite_timeout(rt_expires)) {
2465                                 /* not infinity */
2466                                 flags |= RTF_EXPIRES;
2467                                 expires = jiffies_to_clock_t(rt_expires);
2468                         }
2469                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2470                                               dev, expires, flags);
2471                 }
2472                 ip6_rt_put(rt);
2473         }
2474
2475         /* Try to figure out our local address for this prefix */
2476
2477         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2478                 struct inet6_ifaddr *ifp;
2479                 struct in6_addr addr;
2480                 int create = 0, update_lft = 0;
2481                 bool tokenized = false;
2482
2483                 if (pinfo->prefix_len == 64) {
2484                         memcpy(&addr, &pinfo->prefix, 8);
2485
2486                         if (!ipv6_addr_any(&in6_dev->token)) {
2487                                 read_lock_bh(&in6_dev->lock);
2488                                 memcpy(addr.s6_addr + 8,
2489                                        in6_dev->token.s6_addr + 8, 8);
2490                                 read_unlock_bh(&in6_dev->lock);
2491                                 tokenized = true;
2492                         } else if (in6_dev->addr_gen_mode ==
2493                                    IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2494                                    !ipv6_generate_stable_address(&addr, 0,
2495                                                                  in6_dev)) {
2496                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2497                                 goto ok;
2498                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2499                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2500                                 in6_dev_put(in6_dev);
2501                                 return;
2502                         }
2503                         goto ok;
2504                 }
2505                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2506                                     pinfo->prefix_len);
2507                 in6_dev_put(in6_dev);
2508                 return;
2509
2510 ok:
2511
2512                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2513
2514                 if (!ifp && valid_lft) {
2515                         int max_addresses = in6_dev->cnf.max_addresses;
2516
2517 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2518                         if (in6_dev->cnf.optimistic_dad &&
2519                             !net->ipv6.devconf_all->forwarding && sllao)
2520                                 addr_flags |= IFA_F_OPTIMISTIC;
2521 #endif
2522
2523                         /* Do not allow to create too much of autoconfigured
2524                          * addresses; this would be too easy way to crash kernel.
2525                          */
2526                         if (!max_addresses ||
2527                             ipv6_count_addresses(in6_dev) < max_addresses)
2528                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2529                                                     pinfo->prefix_len,
2530                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2531                                                     addr_flags, valid_lft,
2532                                                     prefered_lft);
2533
2534                         if (IS_ERR_OR_NULL(ifp)) {
2535                                 in6_dev_put(in6_dev);
2536                                 return;
2537                         }
2538
2539                         update_lft = 0;
2540                         create = 1;
2541                         spin_lock_bh(&ifp->lock);
2542                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2543                         ifp->cstamp = jiffies;
2544                         ifp->tokenized = tokenized;
2545                         spin_unlock_bh(&ifp->lock);
2546                         addrconf_dad_start(ifp);
2547                 }
2548
2549                 if (ifp) {
2550                         u32 flags;
2551                         unsigned long now;
2552                         u32 stored_lft;
2553
2554                         /* update lifetime (RFC2462 5.5.3 e) */
2555                         spin_lock_bh(&ifp->lock);
2556                         now = jiffies;
2557                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2558                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2559                         else
2560                                 stored_lft = 0;
2561                         if (!update_lft && !create && stored_lft) {
2562                                 const u32 minimum_lft = min_t(u32,
2563                                         stored_lft, MIN_VALID_LIFETIME);
2564                                 valid_lft = max(valid_lft, minimum_lft);
2565
2566                                 /* RFC4862 Section 5.5.3e:
2567                                  * "Note that the preferred lifetime of the
2568                                  *  corresponding address is always reset to
2569                                  *  the Preferred Lifetime in the received
2570                                  *  Prefix Information option, regardless of
2571                                  *  whether the valid lifetime is also reset or
2572                                  *  ignored."
2573                                  *
2574                                  * So we should always update prefered_lft here.
2575                                  */
2576                                 update_lft = 1;
2577                         }
2578
2579                         if (update_lft) {
2580                                 ifp->valid_lft = valid_lft;
2581                                 ifp->prefered_lft = prefered_lft;
2582                                 ifp->tstamp = now;
2583                                 flags = ifp->flags;
2584                                 ifp->flags &= ~IFA_F_DEPRECATED;
2585                                 spin_unlock_bh(&ifp->lock);
2586
2587                                 if (!(flags&IFA_F_TENTATIVE))
2588                                         ipv6_ifa_notify(0, ifp);
2589                         } else
2590                                 spin_unlock_bh(&ifp->lock);
2591
2592                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2593                                          create, now);
2594
2595                         in6_ifa_put(ifp);
2596                         addrconf_verify();
2597                 }
2598         }
2599         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2600         in6_dev_put(in6_dev);
2601 }
2602
2603 /*
2604  *      Set destination address.
2605  *      Special case for SIT interfaces where we create a new "virtual"
2606  *      device.
2607  */
2608 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2609 {
2610         struct in6_ifreq ireq;
2611         struct net_device *dev;
2612         int err = -EINVAL;
2613
2614         rtnl_lock();
2615
2616         err = -EFAULT;
2617         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2618                 goto err_exit;
2619
2620         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2621
2622         err = -ENODEV;
2623         if (!dev)
2624                 goto err_exit;
2625
2626 #if IS_ENABLED(CONFIG_IPV6_SIT)
2627         if (dev->type == ARPHRD_SIT) {
2628                 const struct net_device_ops *ops = dev->netdev_ops;
2629                 struct ifreq ifr;
2630                 struct ip_tunnel_parm p;
2631
2632                 err = -EADDRNOTAVAIL;
2633                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2634                         goto err_exit;
2635
2636                 memset(&p, 0, sizeof(p));
2637                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2638                 p.iph.saddr = 0;
2639                 p.iph.version = 4;
2640                 p.iph.ihl = 5;
2641                 p.iph.protocol = IPPROTO_IPV6;
2642                 p.iph.ttl = 64;
2643                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2644
2645                 if (ops->ndo_do_ioctl) {
2646                         mm_segment_t oldfs = get_fs();
2647
2648                         set_fs(KERNEL_DS);
2649                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2650                         set_fs(oldfs);
2651                 } else
2652                         err = -EOPNOTSUPP;
2653
2654                 if (err == 0) {
2655                         err = -ENOBUFS;
2656                         dev = __dev_get_by_name(net, p.name);
2657                         if (!dev)
2658                                 goto err_exit;
2659                         err = dev_open(dev);
2660                 }
2661         }
2662 #endif
2663
2664 err_exit:
2665         rtnl_unlock();
2666         return err;
2667 }
2668
2669 static int ipv6_mc_config(struct sock *sk, bool join,
2670                           const struct in6_addr *addr, int ifindex)
2671 {
2672         int ret;
2673
2674         ASSERT_RTNL();
2675
2676         lock_sock(sk);
2677         if (join)
2678                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2679         else
2680                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2681         release_sock(sk);
2682
2683         return ret;
2684 }
2685
2686 /*
2687  *      Manual configuration of address on an interface
2688  */
2689 static int inet6_addr_add(struct net *net, int ifindex,
2690                           const struct in6_addr *pfx,
2691                           const struct in6_addr *peer_pfx,
2692                           unsigned int plen, __u32 ifa_flags,
2693                           __u32 prefered_lft, __u32 valid_lft)
2694 {
2695         struct inet6_ifaddr *ifp;
2696         struct inet6_dev *idev;
2697         struct net_device *dev;
2698         unsigned long timeout;
2699         clock_t expires;
2700         int scope;
2701         u32 flags;
2702
2703         ASSERT_RTNL();
2704
2705         if (plen > 128)
2706                 return -EINVAL;
2707
2708         /* check the lifetime */
2709         if (!valid_lft || prefered_lft > valid_lft)
2710                 return -EINVAL;
2711
2712         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2713                 return -EINVAL;
2714
2715         dev = __dev_get_by_index(net, ifindex);
2716         if (!dev)
2717                 return -ENODEV;
2718
2719         idev = addrconf_add_dev(dev);
2720         if (IS_ERR(idev))
2721                 return PTR_ERR(idev);
2722
2723         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2724                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2725                                          true, pfx, ifindex);
2726
2727                 if (ret < 0)
2728                         return ret;
2729         }
2730
2731         scope = ipv6_addr_scope(pfx);
2732
2733         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2734         if (addrconf_finite_timeout(timeout)) {
2735                 expires = jiffies_to_clock_t(timeout * HZ);
2736                 valid_lft = timeout;
2737                 flags = RTF_EXPIRES;
2738         } else {
2739                 expires = 0;
2740                 flags = 0;
2741                 ifa_flags |= IFA_F_PERMANENT;
2742         }
2743
2744         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2745         if (addrconf_finite_timeout(timeout)) {
2746                 if (timeout == 0)
2747                         ifa_flags |= IFA_F_DEPRECATED;
2748                 prefered_lft = timeout;
2749         }
2750
2751         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2752                             valid_lft, prefered_lft);
2753
2754         if (!IS_ERR(ifp)) {
2755                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2756                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2757                                               expires, flags);
2758                 }
2759
2760                 /*
2761                  * Note that section 3.1 of RFC 4429 indicates
2762                  * that the Optimistic flag should not be set for
2763                  * manually configured addresses
2764                  */
2765                 addrconf_dad_start(ifp);
2766                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2767                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2768                                          true, jiffies);
2769                 in6_ifa_put(ifp);
2770                 addrconf_verify_rtnl();
2771                 return 0;
2772         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2773                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2774                                false, pfx, ifindex);
2775         }
2776
2777         return PTR_ERR(ifp);
2778 }
2779
2780 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2781                           const struct in6_addr *pfx, unsigned int plen)
2782 {
2783         struct inet6_ifaddr *ifp;
2784         struct inet6_dev *idev;
2785         struct net_device *dev;
2786
2787         if (plen > 128)
2788                 return -EINVAL;
2789
2790         dev = __dev_get_by_index(net, ifindex);
2791         if (!dev)
2792                 return -ENODEV;
2793
2794         idev = __in6_dev_get(dev);
2795         if (!idev)
2796                 return -ENXIO;
2797
2798         read_lock_bh(&idev->lock);
2799         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2800                 if (ifp->prefix_len == plen &&
2801                     ipv6_addr_equal(pfx, &ifp->addr)) {
2802                         in6_ifa_hold(ifp);
2803                         read_unlock_bh(&idev->lock);
2804
2805                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2806                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2807                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2808                                                  jiffies);
2809                         ipv6_del_addr(ifp);
2810                         addrconf_verify_rtnl();
2811                         if (ipv6_addr_is_multicast(pfx)) {
2812                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2813                                                false, pfx, dev->ifindex);
2814                         }
2815                         return 0;
2816                 }
2817         }
2818         read_unlock_bh(&idev->lock);
2819         return -EADDRNOTAVAIL;
2820 }
2821
2822
2823 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2824 {
2825         struct in6_ifreq ireq;
2826         int err;
2827
2828         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2829                 return -EPERM;
2830
2831         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2832                 return -EFAULT;
2833
2834         rtnl_lock();
2835         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2836                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2837                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2838         rtnl_unlock();
2839         return err;
2840 }
2841
2842 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2843 {
2844         struct in6_ifreq ireq;
2845         int err;
2846
2847         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2848                 return -EPERM;
2849
2850         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2851                 return -EFAULT;
2852
2853         rtnl_lock();
2854         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2855                              ireq.ifr6_prefixlen);
2856         rtnl_unlock();
2857         return err;
2858 }
2859
2860 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2861                      int plen, int scope)
2862 {
2863         struct inet6_ifaddr *ifp;
2864
2865         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2866                             scope, IFA_F_PERMANENT,
2867                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2868         if (!IS_ERR(ifp)) {
2869                 spin_lock_bh(&ifp->lock);
2870                 ifp->flags &= ~IFA_F_TENTATIVE;
2871                 spin_unlock_bh(&ifp->lock);
2872                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2873                 in6_ifa_put(ifp);
2874         }
2875 }
2876
2877 #if IS_ENABLED(CONFIG_IPV6_SIT)
2878 static void sit_add_v4_addrs(struct inet6_dev *idev)
2879 {
2880         struct in6_addr addr;
2881         struct net_device *dev;
2882         struct net *net = dev_net(idev->dev);
2883         int scope, plen;
2884         u32 pflags = 0;
2885
2886         ASSERT_RTNL();
2887
2888         memset(&addr, 0, sizeof(struct in6_addr));
2889         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2890
2891         if (idev->dev->flags&IFF_POINTOPOINT) {
2892                 addr.s6_addr32[0] = htonl(0xfe800000);
2893                 scope = IFA_LINK;
2894                 plen = 64;
2895         } else {
2896                 scope = IPV6_ADDR_COMPATv4;
2897                 plen = 96;
2898                 pflags |= RTF_NONEXTHOP;
2899         }
2900
2901         if (addr.s6_addr32[3]) {
2902                 add_addr(idev, &addr, plen, scope);
2903                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2904                 return;
2905         }
2906
2907         for_each_netdev(net, dev) {
2908                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2909                 if (in_dev && (dev->flags & IFF_UP)) {
2910                         struct in_ifaddr *ifa;
2911
2912                         int flag = scope;
2913
2914                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2915
2916                                 addr.s6_addr32[3] = ifa->ifa_local;
2917
2918                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2919                                         continue;
2920                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2921                                         if (idev->dev->flags&IFF_POINTOPOINT)
2922                                                 continue;
2923                                         flag |= IFA_HOST;
2924                                 }
2925
2926                                 add_addr(idev, &addr, plen, flag);
2927                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2928                                                       pflags);
2929                         }
2930                 }
2931         }
2932 }
2933 #endif
2934
2935 static void init_loopback(struct net_device *dev)
2936 {
2937         struct inet6_dev  *idev;
2938         struct net_device *sp_dev;
2939         struct inet6_ifaddr *sp_ifa;
2940         struct rt6_info *sp_rt;
2941
2942         /* ::1 */
2943
2944         ASSERT_RTNL();
2945
2946         idev = ipv6_find_idev(dev);
2947         if (!idev) {
2948                 pr_debug("%s: add_dev failed\n", __func__);
2949                 return;
2950         }
2951
2952         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2953
2954         /* Add routes to other interface's IPv6 addresses */
2955         for_each_netdev(dev_net(dev), sp_dev) {
2956                 if (!strcmp(sp_dev->name, dev->name))
2957                         continue;
2958
2959                 idev = __in6_dev_get(sp_dev);
2960                 if (!idev)
2961                         continue;
2962
2963                 read_lock_bh(&idev->lock);
2964                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2965
2966                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2967                                 continue;
2968
2969                         if (sp_ifa->rt) {
2970                                 /* This dst has been added to garbage list when
2971                                  * lo device down, release this obsolete dst and
2972                                  * reallocate a new router for ifa.
2973                                  */
2974                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
2975                                         ip6_rt_put(sp_ifa->rt);
2976                                         sp_ifa->rt = NULL;
2977                                 } else {
2978                                         continue;
2979                                 }
2980                         }
2981
2982                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2983
2984                         /* Failure cases are ignored */
2985                         if (!IS_ERR(sp_rt)) {
2986                                 sp_ifa->rt = sp_rt;
2987                                 ip6_ins_rt(sp_rt);
2988                         }
2989                 }
2990                 read_unlock_bh(&idev->lock);
2991         }
2992 }
2993
2994 static void addrconf_add_linklocal(struct inet6_dev *idev,
2995                                    const struct in6_addr *addr, u32 flags)
2996 {
2997         struct inet6_ifaddr *ifp;
2998         u32 addr_flags = flags | IFA_F_PERMANENT;
2999
3000 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3001         if (idev->cnf.optimistic_dad &&
3002             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3003                 addr_flags |= IFA_F_OPTIMISTIC;
3004 #endif
3005
3006         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3007                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3008         if (!IS_ERR(ifp)) {
3009                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3010                 addrconf_dad_start(ifp);
3011                 in6_ifa_put(ifp);
3012         }
3013 }
3014
3015 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3016 {
3017         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3018                 return true;
3019
3020         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3021             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3022                 return true;
3023
3024         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3025             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3026                 return true;
3027
3028         return false;
3029 }
3030
3031 static int ipv6_generate_stable_address(struct in6_addr *address,
3032                                         u8 dad_count,
3033                                         const struct inet6_dev *idev)
3034 {
3035         static DEFINE_SPINLOCK(lock);
3036         static __u32 digest[SHA_DIGEST_WORDS];
3037         static __u32 workspace[SHA_WORKSPACE_WORDS];
3038
3039         static union {
3040                 char __data[SHA_MESSAGE_BYTES];
3041                 struct {
3042                         struct in6_addr secret;
3043                         __be32 prefix[2];
3044                         unsigned char hwaddr[MAX_ADDR_LEN];
3045                         u8 dad_count;
3046                 } __packed;
3047         } data;
3048
3049         struct in6_addr secret;
3050         struct in6_addr temp;
3051         struct net *net = dev_net(idev->dev);
3052
3053         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3054
3055         if (idev->cnf.stable_secret.initialized)
3056                 secret = idev->cnf.stable_secret.secret;
3057         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3058                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3059         else
3060                 return -1;
3061
3062 retry:
3063         spin_lock_bh(&lock);
3064
3065         sha_init(digest);
3066         memset(&data, 0, sizeof(data));
3067         memset(workspace, 0, sizeof(workspace));
3068         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3069         data.prefix[0] = address->s6_addr32[0];
3070         data.prefix[1] = address->s6_addr32[1];
3071         data.secret = secret;
3072         data.dad_count = dad_count;
3073
3074         sha_transform(digest, data.__data, workspace);
3075
3076         temp = *address;
3077         temp.s6_addr32[2] = (__force __be32)digest[0];
3078         temp.s6_addr32[3] = (__force __be32)digest[1];
3079
3080         spin_unlock_bh(&lock);
3081
3082         if (ipv6_reserved_interfaceid(temp)) {
3083                 dad_count++;
3084                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3085                         return -1;
3086                 goto retry;
3087         }
3088
3089         *address = temp;
3090         return 0;
3091 }
3092
3093 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3094 {
3095         struct in6_addr addr;
3096
3097         /* no link local addresses on L3 master devices */
3098         if (netif_is_l3_master(idev->dev))
3099                 return;
3100
3101         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3102
3103         if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3104                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3105                         addrconf_add_linklocal(idev, &addr,
3106                                                IFA_F_STABLE_PRIVACY);
3107                 else if (prefix_route)
3108                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3109         } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3110                 /* addrconf_add_linklocal also adds a prefix_route and we
3111                  * only need to care about prefix routes if ipv6_generate_eui64
3112                  * couldn't generate one.
3113                  */
3114                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3115                         addrconf_add_linklocal(idev, &addr, 0);
3116                 else if (prefix_route)
3117                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3118         }
3119 }
3120
3121 static void addrconf_dev_config(struct net_device *dev)
3122 {
3123         struct inet6_dev *idev;
3124
3125         ASSERT_RTNL();
3126
3127         if ((dev->type != ARPHRD_ETHER) &&
3128             (dev->type != ARPHRD_FDDI) &&
3129             (dev->type != ARPHRD_ARCNET) &&
3130             (dev->type != ARPHRD_INFINIBAND) &&
3131             (dev->type != ARPHRD_IEEE802154) &&
3132             (dev->type != ARPHRD_IEEE1394) &&
3133             (dev->type != ARPHRD_TUNNEL6) &&
3134             (dev->type != ARPHRD_6LOWPAN)) {
3135                 /* Alas, we support only Ethernet autoconfiguration. */
3136                 return;
3137         }
3138
3139         idev = addrconf_add_dev(dev);
3140         if (IS_ERR(idev))
3141                 return;
3142
3143         addrconf_addr_gen(idev, false);
3144 }
3145
3146 #if IS_ENABLED(CONFIG_IPV6_SIT)
3147 static void addrconf_sit_config(struct net_device *dev)
3148 {
3149         struct inet6_dev *idev;
3150
3151         ASSERT_RTNL();
3152
3153         /*
3154          * Configure the tunnel with one of our IPv4
3155          * addresses... we should configure all of
3156          * our v4 addrs in the tunnel
3157          */
3158
3159         idev = ipv6_find_idev(dev);
3160         if (!idev) {
3161                 pr_debug("%s: add_dev failed\n", __func__);
3162                 return;
3163         }
3164
3165         if (dev->priv_flags & IFF_ISATAP) {
3166                 addrconf_addr_gen(idev, false);
3167                 return;
3168         }
3169
3170         sit_add_v4_addrs(idev);
3171
3172         if (dev->flags&IFF_POINTOPOINT)
3173                 addrconf_add_mroute(dev);
3174 }
3175 #endif
3176
3177 #if IS_ENABLED(CONFIG_NET_IPGRE)
3178 static void addrconf_gre_config(struct net_device *dev)
3179 {
3180         struct inet6_dev *idev;
3181
3182         ASSERT_RTNL();
3183
3184         idev = ipv6_find_idev(dev);
3185         if (!idev) {
3186                 pr_debug("%s: add_dev failed\n", __func__);
3187                 return;
3188         }
3189
3190         addrconf_addr_gen(idev, true);
3191         if (dev->flags & IFF_POINTOPOINT)
3192                 addrconf_add_mroute(dev);
3193 }
3194 #endif
3195
3196 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3197                            void *ptr)
3198 {
3199         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3200         struct inet6_dev *idev = __in6_dev_get(dev);
3201         struct net *net = dev_net(dev);
3202         int run_pending = 0;
3203         int err;
3204
3205         switch (event) {
3206         case NETDEV_REGISTER:
3207                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3208                         idev = ipv6_add_dev(dev);
3209                         if (IS_ERR(idev))
3210                                 return notifier_from_errno(PTR_ERR(idev));
3211                 }
3212                 break;
3213
3214         case NETDEV_CHANGEMTU:
3215                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3216                 if (dev->mtu < IPV6_MIN_MTU) {
3217                         addrconf_ifdown(dev, dev != net->loopback_dev);
3218                         break;
3219                 }
3220
3221                 if (idev) {
3222                         rt6_mtu_change(dev, dev->mtu);
3223                         idev->cnf.mtu6 = dev->mtu;
3224                         break;
3225                 }
3226
3227                 /* allocate new idev */
3228                 idev = ipv6_add_dev(dev);
3229                 if (IS_ERR(idev))
3230                         break;
3231
3232                 /* device is still not ready */
3233                 if (!(idev->if_flags & IF_READY))
3234                         break;
3235
3236                 run_pending = 1;
3237
3238                 /* fall through */
3239
3240         case NETDEV_UP:
3241         case NETDEV_CHANGE:
3242                 if (dev->flags & IFF_SLAVE)
3243                         break;
3244
3245                 if (idev && idev->cnf.disable_ipv6)
3246                         break;
3247
3248                 if (event == NETDEV_UP) {
3249                         if (!addrconf_qdisc_ok(dev)) {
3250                                 /* device is not ready yet. */
3251                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3252                                         dev->name);
3253                                 break;
3254                         }
3255
3256                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3257                                 idev = ipv6_add_dev(dev);
3258
3259                         if (!IS_ERR_OR_NULL(idev)) {
3260                                 idev->if_flags |= IF_READY;
3261                                 run_pending = 1;
3262                         }
3263                 } else if (event == NETDEV_CHANGE) {
3264                         if (!addrconf_qdisc_ok(dev)) {
3265                                 /* device is still not ready. */
3266                                 break;
3267                         }
3268
3269                         if (idev) {
3270                                 if (idev->if_flags & IF_READY) {
3271                                         /* device is already configured -
3272                                          * but resend MLD reports, we might
3273                                          * have roamed and need to update
3274                                          * multicast snooping switches
3275                                          */
3276                                         ipv6_mc_up(idev);
3277                                         break;
3278                                 }
3279                                 idev->if_flags |= IF_READY;
3280                         }
3281
3282                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3283                                 dev->name);
3284
3285                         run_pending = 1;
3286                 }
3287
3288                 switch (dev->type) {
3289 #if IS_ENABLED(CONFIG_IPV6_SIT)
3290                 case ARPHRD_SIT:
3291                         addrconf_sit_config(dev);
3292                         break;
3293 #endif
3294 #if IS_ENABLED(CONFIG_NET_IPGRE)
3295                 case ARPHRD_IPGRE:
3296                         addrconf_gre_config(dev);
3297                         break;
3298 #endif
3299                 case ARPHRD_LOOPBACK:
3300                         init_loopback(dev);
3301                         break;
3302
3303                 default:
3304                         addrconf_dev_config(dev);
3305                         break;
3306                 }
3307
3308                 if (!IS_ERR_OR_NULL(idev)) {
3309                         if (run_pending)
3310                                 addrconf_dad_run(idev);
3311
3312                         /*
3313                          * If the MTU changed during the interface down,
3314                          * when the interface up, the changed MTU must be
3315                          * reflected in the idev as well as routers.
3316                          */
3317                         if (idev->cnf.mtu6 != dev->mtu &&
3318                             dev->mtu >= IPV6_MIN_MTU) {
3319                                 rt6_mtu_change(dev, dev->mtu);
3320                                 idev->cnf.mtu6 = dev->mtu;
3321                         }
3322                         idev->tstamp = jiffies;
3323                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3324
3325                         /*
3326                          * If the changed mtu during down is lower than
3327                          * IPV6_MIN_MTU stop IPv6 on this interface.
3328                          */
3329                         if (dev->mtu < IPV6_MIN_MTU)
3330                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3331                 }
3332                 break;
3333
3334         case NETDEV_DOWN:
3335         case NETDEV_UNREGISTER:
3336                 /*
3337                  *      Remove all addresses from this interface.
3338                  */
3339                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3340                 break;
3341
3342         case NETDEV_CHANGENAME:
3343                 if (idev) {
3344                         snmp6_unregister_dev(idev);
3345                         addrconf_sysctl_unregister(idev);
3346                         err = addrconf_sysctl_register(idev);
3347                         if (err)
3348                                 return notifier_from_errno(err);
3349                         err = snmp6_register_dev(idev);
3350                         if (err) {
3351                                 addrconf_sysctl_unregister(idev);
3352                                 return notifier_from_errno(err);
3353                         }
3354                 }
3355                 break;
3356
3357         case NETDEV_PRE_TYPE_CHANGE:
3358         case NETDEV_POST_TYPE_CHANGE:
3359                 addrconf_type_change(dev, event);
3360                 break;
3361         }
3362
3363         return NOTIFY_OK;
3364 }
3365
3366 /*
3367  *      addrconf module should be notified of a device going up
3368  */
3369 static struct notifier_block ipv6_dev_notf = {
3370         .notifier_call = addrconf_notify,
3371         .priority = ADDRCONF_NOTIFY_PRIORITY,
3372 };
3373
3374 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3375 {
3376         struct inet6_dev *idev;
3377         ASSERT_RTNL();
3378
3379         idev = __in6_dev_get(dev);
3380
3381         if (event == NETDEV_POST_TYPE_CHANGE)
3382                 ipv6_mc_remap(idev);
3383         else if (event == NETDEV_PRE_TYPE_CHANGE)
3384                 ipv6_mc_unmap(idev);
3385 }
3386
3387 static int addrconf_ifdown(struct net_device *dev, int how)
3388 {
3389         struct net *net = dev_net(dev);
3390         struct inet6_dev *idev;
3391         struct inet6_ifaddr *ifa;
3392         int state, i;
3393
3394         ASSERT_RTNL();
3395
3396         rt6_ifdown(net, dev);
3397         neigh_ifdown(&nd_tbl, dev);
3398
3399         idev = __in6_dev_get(dev);
3400         if (!idev)
3401                 return -ENODEV;
3402
3403         /*
3404          * Step 1: remove reference to ipv6 device from parent device.
3405          *         Do not dev_put!
3406          */
3407         if (how) {
3408                 idev->dead = 1;
3409
3410                 /* protected by rtnl_lock */
3411                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3412
3413                 /* Step 1.5: remove snmp6 entry */
3414                 snmp6_unregister_dev(idev);
3415
3416         }
3417
3418         /* Step 2: clear hash table */
3419         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3420                 struct hlist_head *h = &inet6_addr_lst[i];
3421
3422                 spin_lock_bh(&addrconf_hash_lock);
3423 restart:
3424                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3425                         if (ifa->idev == idev) {
3426                                 hlist_del_init_rcu(&ifa->addr_lst);
3427                                 addrconf_del_dad_work(ifa);
3428                                 goto restart;
3429                         }
3430                 }
3431                 spin_unlock_bh(&addrconf_hash_lock);
3432         }
3433
3434         write_lock_bh(&idev->lock);
3435
3436         addrconf_del_rs_timer(idev);
3437
3438         /* Step 2: clear flags for stateless addrconf */
3439         if (!how)
3440                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3441
3442         if (how && del_timer(&idev->regen_timer))
3443                 in6_dev_put(idev);
3444
3445         /* Step 3: clear tempaddr list */
3446         while (!list_empty(&idev->tempaddr_list)) {
3447                 ifa = list_first_entry(&idev->tempaddr_list,
3448                                        struct inet6_ifaddr, tmp_list);
3449                 list_del(&ifa->tmp_list);
3450                 write_unlock_bh(&idev->lock);
3451                 spin_lock_bh(&ifa->lock);
3452
3453                 if (ifa->ifpub) {
3454                         in6_ifa_put(ifa->ifpub);
3455                         ifa->ifpub = NULL;
3456                 }
3457                 spin_unlock_bh(&ifa->lock);
3458                 in6_ifa_put(ifa);
3459                 write_lock_bh(&idev->lock);
3460         }
3461
3462         while (!list_empty(&idev->addr_list)) {
3463                 ifa = list_first_entry(&idev->addr_list,
3464                                        struct inet6_ifaddr, if_list);
3465                 addrconf_del_dad_work(ifa);
3466
3467                 list_del(&ifa->if_list);
3468
3469                 write_unlock_bh(&idev->lock);
3470
3471                 spin_lock_bh(&ifa->lock);
3472                 state = ifa->state;
3473                 ifa->state = INET6_IFADDR_STATE_DEAD;
3474                 spin_unlock_bh(&ifa->lock);
3475
3476                 if (state != INET6_IFADDR_STATE_DEAD) {
3477                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3478                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3479                 }
3480                 in6_ifa_put(ifa);
3481
3482                 write_lock_bh(&idev->lock);
3483         }
3484
3485         write_unlock_bh(&idev->lock);
3486
3487         /* Step 5: Discard anycast and multicast list */
3488         if (how) {
3489                 ipv6_ac_destroy_dev(idev);
3490                 ipv6_mc_destroy_dev(idev);
3491         } else {
3492                 ipv6_mc_down(idev);
3493         }
3494
3495         idev->tstamp = jiffies;
3496
3497         /* Last: Shot the device (if unregistered) */
3498         if (how) {
3499                 addrconf_sysctl_unregister(idev);
3500                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3501                 neigh_ifdown(&nd_tbl, dev);
3502                 in6_dev_put(idev);
3503         }
3504         return 0;
3505 }
3506
3507 static void addrconf_rs_timer(unsigned long data)
3508 {
3509         struct inet6_dev *idev = (struct inet6_dev *)data;
3510         struct net_device *dev = idev->dev;
3511         struct in6_addr lladdr;
3512
3513         write_lock(&idev->lock);
3514         if (idev->dead || !(idev->if_flags & IF_READY))
3515                 goto out;
3516
3517         if (!ipv6_accept_ra(idev))
3518                 goto out;
3519
3520         /* Announcement received after solicitation was sent */
3521         if (idev->if_flags & IF_RA_RCVD)
3522                 goto out;
3523
3524         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3525                 write_unlock(&idev->lock);
3526                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3527                         ndisc_send_rs(dev, &lladdr,
3528                                       &in6addr_linklocal_allrouters);
3529                 else
3530                         goto put;
3531
3532                 write_lock(&idev->lock);
3533                 idev->rs_interval = rfc3315_s14_backoff_update(
3534                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3535                 /* The wait after the last probe can be shorter */
3536                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3537                                              idev->cnf.rtr_solicits) ?
3538                                       idev->cnf.rtr_solicit_delay :
3539                                       idev->rs_interval);
3540         } else {
3541                 /*
3542                  * Note: we do not support deprecated "all on-link"
3543                  * assumption any longer.
3544                  */
3545                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3546         }
3547
3548 out:
3549         write_unlock(&idev->lock);
3550 put:
3551         in6_dev_put(idev);
3552 }
3553
3554 /*
3555  *      Duplicate Address Detection
3556  */
3557 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3558 {
3559         unsigned long rand_num;
3560         struct inet6_dev *idev = ifp->idev;
3561
3562         if (ifp->flags & IFA_F_OPTIMISTIC)
3563                 rand_num = 0;
3564         else
3565                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3566
3567         ifp->dad_probes = idev->cnf.dad_transmits;
3568         addrconf_mod_dad_work(ifp, rand_num);
3569 }
3570
3571 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3572 {
3573         struct inet6_dev *idev = ifp->idev;
3574         struct net_device *dev = idev->dev;
3575         bool notify = false;
3576
3577         addrconf_join_solict(dev, &ifp->addr);
3578
3579         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3580
3581         read_lock_bh(&idev->lock);
3582         spin_lock(&ifp->lock);
3583         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3584                 goto out;
3585
3586         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3587             idev->cnf.accept_dad < 1 ||
3588             !(ifp->flags&IFA_F_TENTATIVE) ||
3589             ifp->flags & IFA_F_NODAD) {
3590                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3591                 spin_unlock(&ifp->lock);
3592                 read_unlock_bh(&idev->lock);
3593
3594                 addrconf_dad_completed(ifp);
3595                 return;
3596         }
3597
3598         if (!(idev->if_flags & IF_READY)) {
3599                 spin_unlock(&ifp->lock);
3600                 read_unlock_bh(&idev->lock);
3601                 /*
3602                  * If the device is not ready:
3603                  * - keep it tentative if it is a permanent address.
3604                  * - otherwise, kill it.
3605                  */
3606                 in6_ifa_hold(ifp);
3607                 addrconf_dad_stop(ifp, 0);
3608                 return;
3609         }
3610
3611         /*
3612          * Optimistic nodes can start receiving
3613          * Frames right away
3614          */
3615         if (ifp->flags & IFA_F_OPTIMISTIC) {
3616                 ip6_ins_rt(ifp->rt);
3617                 if (ipv6_use_optimistic_addr(idev)) {
3618                         /* Because optimistic nodes can use this address,
3619                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3620                          */
3621                         notify = true;
3622                 }
3623         }
3624
3625         addrconf_dad_kick(ifp);
3626 out:
3627         spin_unlock(&ifp->lock);
3628         read_unlock_bh(&idev->lock);
3629         if (notify)
3630                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3631 }
3632
3633 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3634 {
3635         bool begin_dad = false;
3636
3637         spin_lock_bh(&ifp->lock);
3638         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3639                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3640                 begin_dad = true;
3641         }
3642         spin_unlock_bh(&ifp->lock);
3643
3644         if (begin_dad)
3645                 addrconf_mod_dad_work(ifp, 0);
3646 }
3647
3648 static void addrconf_dad_work(struct work_struct *w)
3649 {
3650         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3651                                                 struct inet6_ifaddr,
3652                                                 dad_work);
3653         struct inet6_dev *idev = ifp->idev;
3654         struct in6_addr mcaddr;
3655
3656         enum {
3657                 DAD_PROCESS,
3658                 DAD_BEGIN,
3659                 DAD_ABORT,
3660         } action = DAD_PROCESS;
3661
3662         rtnl_lock();
3663
3664         spin_lock_bh(&ifp->lock);
3665         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3666                 action = DAD_BEGIN;
3667                 ifp->state = INET6_IFADDR_STATE_DAD;
3668         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3669                 action = DAD_ABORT;
3670                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3671         }
3672         spin_unlock_bh(&ifp->lock);
3673
3674         if (action == DAD_BEGIN) {
3675                 addrconf_dad_begin(ifp);
3676                 goto out;
3677         } else if (action == DAD_ABORT) {
3678                 in6_ifa_hold(ifp);
3679                 addrconf_dad_stop(ifp, 1);
3680                 goto out;
3681         }
3682
3683         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3684                 goto out;
3685
3686         write_lock_bh(&idev->lock);
3687         if (idev->dead || !(idev->if_flags & IF_READY)) {
3688                 write_unlock_bh(&idev->lock);
3689                 goto out;
3690         }
3691
3692         spin_lock(&ifp->lock);
3693         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3694                 spin_unlock(&ifp->lock);
3695                 write_unlock_bh(&idev->lock);
3696                 goto out;
3697         }
3698
3699         if (ifp->dad_probes == 0) {
3700                 /*
3701                  * DAD was successful
3702                  */
3703
3704                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3705                 spin_unlock(&ifp->lock);
3706                 write_unlock_bh(&idev->lock);
3707
3708                 addrconf_dad_completed(ifp);
3709
3710                 goto out;
3711         }
3712
3713         ifp->dad_probes--;
3714         addrconf_mod_dad_work(ifp,
3715                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3716         spin_unlock(&ifp->lock);
3717         write_unlock_bh(&idev->lock);
3718
3719         /* send a neighbour solicitation for our addr */
3720         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3721         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3722 out:
3723         in6_ifa_put(ifp);
3724         rtnl_unlock();
3725 }
3726
3727 /* ifp->idev must be at least read locked */
3728 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3729 {
3730         struct inet6_ifaddr *ifpiter;
3731         struct inet6_dev *idev = ifp->idev;
3732
3733         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3734                 if (ifpiter->scope > IFA_LINK)
3735                         break;
3736                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3737                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3738                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3739                     IFA_F_PERMANENT)
3740                         return false;
3741         }
3742         return true;
3743 }
3744
3745 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3746 {
3747         struct net_device *dev = ifp->idev->dev;
3748         struct in6_addr lladdr;
3749         bool send_rs, send_mld;
3750
3751         addrconf_del_dad_work(ifp);
3752
3753         /*
3754          *      Configure the address for reception. Now it is valid.
3755          */
3756
3757         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3758
3759         /* If added prefix is link local and we are prepared to process
3760            router advertisements, start sending router solicitations.
3761          */
3762
3763         read_lock_bh(&ifp->idev->lock);
3764         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3765         send_rs = send_mld &&
3766                   ipv6_accept_ra(ifp->idev) &&
3767                   ifp->idev->cnf.rtr_solicits != 0 &&
3768                   (dev->flags&IFF_LOOPBACK) == 0;
3769         read_unlock_bh(&ifp->idev->lock);
3770
3771         /* While dad is in progress mld report's source address is in6_addrany.
3772          * Resend with proper ll now.
3773          */
3774         if (send_mld)
3775                 ipv6_mc_dad_complete(ifp->idev);
3776
3777         if (send_rs) {
3778                 /*
3779                  *      If a host as already performed a random delay
3780                  *      [...] as part of DAD [...] there is no need
3781                  *      to delay again before sending the first RS
3782                  */
3783                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3784                         return;
3785                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3786
3787                 write_lock_bh(&ifp->idev->lock);
3788                 spin_lock(&ifp->lock);
3789                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
3790                         ifp->idev->cnf.rtr_solicit_interval);
3791                 ifp->idev->rs_probes = 1;
3792                 ifp->idev->if_flags |= IF_RS_SENT;
3793                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
3794                 spin_unlock(&ifp->lock);
3795                 write_unlock_bh(&ifp->idev->lock);
3796         }
3797 }
3798
3799 static void addrconf_dad_run(struct inet6_dev *idev)
3800 {
3801         struct inet6_ifaddr *ifp;
3802
3803         read_lock_bh(&idev->lock);
3804         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3805                 spin_lock(&ifp->lock);
3806                 if (ifp->flags & IFA_F_TENTATIVE &&
3807                     ifp->state == INET6_IFADDR_STATE_DAD)
3808                         addrconf_dad_kick(ifp);
3809                 spin_unlock(&ifp->lock);
3810         }
3811         read_unlock_bh(&idev->lock);
3812 }
3813
3814 #ifdef CONFIG_PROC_FS
3815 struct if6_iter_state {
3816         struct seq_net_private p;
3817         int bucket;
3818         int offset;
3819 };
3820
3821 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3822 {
3823         struct inet6_ifaddr *ifa = NULL;
3824         struct if6_iter_state *state = seq->private;
3825         struct net *net = seq_file_net(seq);
3826         int p = 0;
3827
3828         /* initial bucket if pos is 0 */
3829         if (pos == 0) {
3830                 state->bucket = 0;
3831                 state->offset = 0;
3832         }
3833
3834         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3835                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3836                                          addr_lst) {
3837                         if (!net_eq(dev_net(ifa->idev->dev), net))
3838                                 continue;
3839                         /* sync with offset */
3840                         if (p < state->offset) {
3841                                 p++;
3842                                 continue;
3843                         }
3844                         return ifa;
3845                 }
3846
3847                 /* prepare for next bucket */
3848                 state->offset = 0;
3849                 p = 0;
3850         }
3851         return NULL;
3852 }
3853
3854 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3855                                          struct inet6_ifaddr *ifa)
3856 {
3857         struct if6_iter_state *state = seq->private;
3858         struct net *net = seq_file_net(seq);
3859
3860         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3861                 if (!net_eq(dev_net(ifa->idev->dev), net))
3862                         continue;
3863                 state->offset++;
3864                 return ifa;
3865         }
3866
3867         state->offset = 0;
3868         while (++state->bucket < IN6_ADDR_HSIZE) {
3869                 hlist_for_each_entry_rcu_bh(ifa,
3870                                      &inet6_addr_lst[state->bucket], addr_lst) {
3871                         if (!net_eq(dev_net(ifa->idev->dev), net))
3872                                 continue;
3873                         return ifa;
3874                 }
3875         }
3876
3877         return NULL;
3878 }
3879
3880 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3881         __acquires(rcu_bh)
3882 {
3883         rcu_read_lock_bh();
3884         return if6_get_first(seq, *pos);
3885 }
3886
3887 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3888 {
3889         struct inet6_ifaddr *ifa;
3890
3891         ifa = if6_get_next(seq, v);
3892         ++*pos;
3893         return ifa;
3894 }
3895
3896 static void if6_seq_stop(struct seq_file *seq, void *v)
3897         __releases(rcu_bh)
3898 {
3899         rcu_read_unlock_bh();
3900 }
3901
3902 static int if6_seq_show(struct seq_file *seq, void *v)
3903 {
3904         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3905         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3906                    &ifp->addr,
3907                    ifp->idev->dev->ifindex,
3908                    ifp->prefix_len,
3909                    ifp->scope,
3910                    (u8) ifp->flags,
3911                    ifp->idev->dev->name);
3912         return 0;
3913 }
3914
3915 static const struct seq_operations if6_seq_ops = {
3916         .start  = if6_seq_start,
3917         .next   = if6_seq_next,
3918         .show   = if6_seq_show,
3919         .stop   = if6_seq_stop,
3920 };
3921
3922 static int if6_seq_open(struct inode *inode, struct file *file)
3923 {
3924         return seq_open_net(inode, file, &if6_seq_ops,
3925                             sizeof(struct if6_iter_state));
3926 }
3927
3928 static const struct file_operations if6_fops = {
3929         .owner          = THIS_MODULE,
3930         .open           = if6_seq_open,
3931         .read           = seq_read,
3932         .llseek         = seq_lseek,
3933         .release        = seq_release_net,
3934 };
3935
3936 static int __net_init if6_proc_net_init(struct net *net)
3937 {
3938         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3939                 return -ENOMEM;
3940         return 0;
3941 }
3942
3943 static void __net_exit if6_proc_net_exit(struct net *net)
3944 {
3945         remove_proc_entry("if_inet6", net->proc_net);
3946 }
3947
3948 static struct pernet_operations if6_proc_net_ops = {
3949         .init = if6_proc_net_init,
3950         .exit = if6_proc_net_exit,
3951 };
3952
3953 int __init if6_proc_init(void)
3954 {
3955         return register_pernet_subsys(&if6_proc_net_ops);
3956 }
3957
3958 void if6_proc_exit(void)
3959 {
3960         unregister_pernet_subsys(&if6_proc_net_ops);
3961 }
3962 #endif  /* CONFIG_PROC_FS */
3963
3964 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3965 /* Check if address is a home address configured on any interface. */
3966 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3967 {
3968         int ret = 0;
3969         struct inet6_ifaddr *ifp = NULL;
3970         unsigned int hash = inet6_addr_hash(addr);
3971
3972         rcu_read_lock_bh();
3973         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3974                 if (!net_eq(dev_net(ifp->idev->dev), net))
3975                         continue;
3976                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3977                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3978                         ret = 1;
3979                         break;
3980                 }
3981         }
3982         rcu_read_unlock_bh();
3983         return ret;
3984 }
3985 #endif
3986
3987 /*
3988  *      Periodic address status verification
3989  */
3990
3991 static void addrconf_verify_rtnl(void)
3992 {
3993         unsigned long now, next, next_sec, next_sched;
3994         struct inet6_ifaddr *ifp;
3995         int i;
3996
3997         ASSERT_RTNL();
3998
3999         rcu_read_lock_bh();
4000         now = jiffies;
4001         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4002
4003         cancel_delayed_work(&addr_chk_work);
4004
4005         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4006 restart:
4007                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4008                         unsigned long age;
4009
4010                         /* When setting preferred_lft to a value not zero or
4011                          * infinity, while valid_lft is infinity
4012                          * IFA_F_PERMANENT has a non-infinity life time.
4013                          */
4014                         if ((ifp->flags & IFA_F_PERMANENT) &&
4015                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4016                                 continue;
4017
4018                         spin_lock(&ifp->lock);
4019                         /* We try to batch several events at once. */
4020                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4021
4022                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4023                             age >= ifp->valid_lft) {
4024                                 spin_unlock(&ifp->lock);
4025                                 in6_ifa_hold(ifp);
4026                                 ipv6_del_addr(ifp);
4027                                 goto restart;
4028                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4029                                 spin_unlock(&ifp->lock);
4030                                 continue;
4031                         } else if (age >= ifp->prefered_lft) {
4032                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4033                                 int deprecate = 0;
4034
4035                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4036                                         deprecate = 1;
4037                                         ifp->flags |= IFA_F_DEPRECATED;
4038                                 }
4039
4040                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4041                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4042                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4043
4044                                 spin_unlock(&ifp->lock);
4045
4046                                 if (deprecate) {
4047                                         in6_ifa_hold(ifp);
4048
4049                                         ipv6_ifa_notify(0, ifp);
4050                                         in6_ifa_put(ifp);
4051                                         goto restart;
4052                                 }
4053                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4054                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4055                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4056                                         ifp->idev->cnf.dad_transmits *
4057                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4058
4059                                 if (age >= ifp->prefered_lft - regen_advance) {
4060                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4061                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4062                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4063                                         if (!ifp->regen_count && ifpub) {
4064                                                 ifp->regen_count++;
4065                                                 in6_ifa_hold(ifp);
4066                                                 in6_ifa_hold(ifpub);
4067                                                 spin_unlock(&ifp->lock);
4068
4069                                                 spin_lock(&ifpub->lock);
4070                                                 ifpub->regen_count = 0;
4071                                                 spin_unlock(&ifpub->lock);
4072                                                 ipv6_create_tempaddr(ifpub, ifp);
4073                                                 in6_ifa_put(ifpub);
4074                                                 in6_ifa_put(ifp);
4075                                                 goto restart;
4076                                         }
4077                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4078                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4079                                 spin_unlock(&ifp->lock);
4080                         } else {
4081                                 /* ifp->prefered_lft <= ifp->valid_lft */
4082                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4083                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4084                                 spin_unlock(&ifp->lock);
4085                         }
4086                 }
4087         }
4088
4089         next_sec = round_jiffies_up(next);
4090         next_sched = next;
4091
4092         /* If rounded timeout is accurate enough, accept it. */
4093         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4094                 next_sched = next_sec;
4095
4096         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4097         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4098                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4099
4100         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4101               now, next, next_sec, next_sched);
4102         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4103         rcu_read_unlock_bh();
4104 }
4105
4106 static void addrconf_verify_work(struct work_struct *w)
4107 {
4108         rtnl_lock();
4109         addrconf_verify_rtnl();
4110         rtnl_unlock();
4111 }
4112
4113 static void addrconf_verify(void)
4114 {
4115         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4116 }
4117
4118 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4119                                      struct in6_addr **peer_pfx)
4120 {
4121         struct in6_addr *pfx = NULL;
4122
4123         *peer_pfx = NULL;
4124
4125         if (addr)
4126                 pfx = nla_data(addr);
4127
4128         if (local) {
4129                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4130                         *peer_pfx = pfx;
4131                 pfx = nla_data(local);
4132         }
4133
4134         return pfx;
4135 }
4136
4137 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4138         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4139         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4140         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4141         [IFA_FLAGS]             = { .len = sizeof(u32) },
4142 };
4143
4144 static int
4145 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4146 {
4147         struct net *net = sock_net(skb->sk);
4148         struct ifaddrmsg *ifm;
4149         struct nlattr *tb[IFA_MAX+1];
4150         struct in6_addr *pfx, *peer_pfx;
4151         u32 ifa_flags;
4152         int err;
4153
4154         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4155         if (err < 0)
4156                 return err;
4157
4158         ifm = nlmsg_data(nlh);
4159         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4160         if (!pfx)
4161                 return -EINVAL;
4162
4163         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4164
4165         /* We ignore other flags so far. */
4166         ifa_flags &= IFA_F_MANAGETEMPADDR;
4167
4168         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4169                               ifm->ifa_prefixlen);
4170 }
4171
4172 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4173                              u32 prefered_lft, u32 valid_lft)
4174 {
4175         u32 flags;
4176         clock_t expires;
4177         unsigned long timeout;
4178         bool was_managetempaddr;
4179         bool had_prefixroute;
4180
4181         ASSERT_RTNL();
4182
4183         if (!valid_lft || (prefered_lft > valid_lft))
4184                 return -EINVAL;
4185
4186         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4187             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4188                 return -EINVAL;
4189
4190         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4191         if (addrconf_finite_timeout(timeout)) {
4192                 expires = jiffies_to_clock_t(timeout * HZ);
4193                 valid_lft = timeout;
4194                 flags = RTF_EXPIRES;
4195         } else {
4196                 expires = 0;
4197                 flags = 0;
4198                 ifa_flags |= IFA_F_PERMANENT;
4199         }
4200
4201         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4202         if (addrconf_finite_timeout(timeout)) {
4203                 if (timeout == 0)
4204                         ifa_flags |= IFA_F_DEPRECATED;
4205                 prefered_lft = timeout;
4206         }
4207
4208         spin_lock_bh(&ifp->lock);
4209         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4210         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4211                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4212         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4213                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4214                         IFA_F_NOPREFIXROUTE);
4215         ifp->flags |= ifa_flags;
4216         ifp->tstamp = jiffies;
4217         ifp->valid_lft = valid_lft;
4218         ifp->prefered_lft = prefered_lft;
4219
4220         spin_unlock_bh(&ifp->lock);
4221         if (!(ifp->flags&IFA_F_TENTATIVE))
4222                 ipv6_ifa_notify(0, ifp);
4223
4224         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4225                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4226                                       expires, flags);
4227         } else if (had_prefixroute) {
4228                 enum cleanup_prefix_rt_t action;
4229                 unsigned long rt_expires;
4230
4231                 write_lock_bh(&ifp->idev->lock);
4232                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4233                 write_unlock_bh(&ifp->idev->lock);
4234
4235                 if (action != CLEANUP_PREFIX_RT_NOP) {
4236                         cleanup_prefix_route(ifp, rt_expires,
4237                                 action == CLEANUP_PREFIX_RT_DEL);
4238                 }
4239         }
4240
4241         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4242                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4243                         valid_lft = prefered_lft = 0;
4244                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4245                                  !was_managetempaddr, jiffies);
4246         }
4247
4248         addrconf_verify_rtnl();
4249
4250         return 0;
4251 }
4252
4253 static int
4254 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4255 {
4256         struct net *net = sock_net(skb->sk);
4257         struct ifaddrmsg *ifm;
4258         struct nlattr *tb[IFA_MAX+1];
4259         struct in6_addr *pfx, *peer_pfx;
4260         struct inet6_ifaddr *ifa;
4261         struct net_device *dev;
4262         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4263         u32 ifa_flags;
4264         int err;
4265
4266         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4267         if (err < 0)
4268                 return err;
4269
4270         ifm = nlmsg_data(nlh);
4271         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4272         if (!pfx)
4273                 return -EINVAL;
4274
4275         if (tb[IFA_CACHEINFO]) {
4276                 struct ifa_cacheinfo *ci;
4277
4278                 ci = nla_data(tb[IFA_CACHEINFO]);
4279                 valid_lft = ci->ifa_valid;
4280                 preferred_lft = ci->ifa_prefered;
4281         } else {
4282                 preferred_lft = INFINITY_LIFE_TIME;
4283                 valid_lft = INFINITY_LIFE_TIME;
4284         }
4285
4286         dev =  __dev_get_by_index(net, ifm->ifa_index);
4287         if (!dev)
4288                 return -ENODEV;
4289
4290         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4291
4292         /* We ignore other flags so far. */
4293         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4294                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4295
4296         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4297         if (!ifa) {
4298                 /*
4299                  * It would be best to check for !NLM_F_CREATE here but
4300                  * userspace already relies on not having to provide this.
4301                  */
4302                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4303                                       ifm->ifa_prefixlen, ifa_flags,
4304                                       preferred_lft, valid_lft);
4305         }
4306
4307         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4308             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4309                 err = -EEXIST;
4310         else
4311                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4312
4313         in6_ifa_put(ifa);
4314
4315         return err;
4316 }
4317
4318 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4319                           u8 scope, int ifindex)
4320 {
4321         struct ifaddrmsg *ifm;
4322
4323         ifm = nlmsg_data(nlh);
4324         ifm->ifa_family = AF_INET6;
4325         ifm->ifa_prefixlen = prefixlen;
4326         ifm->ifa_flags = flags;
4327         ifm->ifa_scope = scope;
4328         ifm->ifa_index = ifindex;
4329 }
4330
4331 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4332                          unsigned long tstamp, u32 preferred, u32 valid)
4333 {
4334         struct ifa_cacheinfo ci;
4335
4336         ci.cstamp = cstamp_delta(cstamp);
4337         ci.tstamp = cstamp_delta(tstamp);
4338         ci.ifa_prefered = preferred;
4339         ci.ifa_valid = valid;
4340
4341         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4342 }
4343
4344 static inline int rt_scope(int ifa_scope)
4345 {
4346         if (ifa_scope & IFA_HOST)
4347                 return RT_SCOPE_HOST;
4348         else if (ifa_scope & IFA_LINK)
4349                 return RT_SCOPE_LINK;
4350         else if (ifa_scope & IFA_SITE)
4351                 return RT_SCOPE_SITE;
4352         else
4353                 return RT_SCOPE_UNIVERSE;
4354 }
4355
4356 static inline int inet6_ifaddr_msgsize(void)
4357 {
4358         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4359                + nla_total_size(16) /* IFA_LOCAL */
4360                + nla_total_size(16) /* IFA_ADDRESS */
4361                + nla_total_size(sizeof(struct ifa_cacheinfo))
4362                + nla_total_size(4)  /* IFA_FLAGS */;
4363 }
4364
4365 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4366                              u32 portid, u32 seq, int event, unsigned int flags)
4367 {
4368         struct nlmsghdr  *nlh;
4369         u32 preferred, valid;
4370
4371         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4372         if (!nlh)
4373                 return -EMSGSIZE;
4374
4375         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4376                       ifa->idev->dev->ifindex);
4377
4378         if (!((ifa->flags&IFA_F_PERMANENT) &&
4379               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4380                 preferred = ifa->prefered_lft;
4381                 valid = ifa->valid_lft;
4382                 if (preferred != INFINITY_LIFE_TIME) {
4383                         long tval = (jiffies - ifa->tstamp)/HZ;
4384                         if (preferred > tval)
4385                                 preferred -= tval;
4386                         else
4387                                 preferred = 0;
4388                         if (valid != INFINITY_LIFE_TIME) {
4389                                 if (valid > tval)
4390                                         valid -= tval;
4391                                 else
4392                                         valid = 0;
4393                         }
4394                 }
4395         } else {
4396                 preferred = INFINITY_LIFE_TIME;
4397                 valid = INFINITY_LIFE_TIME;
4398         }
4399
4400         if (!ipv6_addr_any(&ifa->peer_addr)) {
4401                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4402                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4403                         goto error;
4404         } else
4405                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4406                         goto error;
4407
4408         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4409                 goto error;
4410
4411         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4412                 goto error;
4413
4414         nlmsg_end(skb, nlh);
4415         return 0;
4416
4417 error:
4418         nlmsg_cancel(skb, nlh);
4419         return -EMSGSIZE;
4420 }
4421
4422 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4423                                 u32 portid, u32 seq, int event, u16 flags)
4424 {
4425         struct nlmsghdr  *nlh;
4426         u8 scope = RT_SCOPE_UNIVERSE;
4427         int ifindex = ifmca->idev->dev->ifindex;
4428
4429         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4430                 scope = RT_SCOPE_SITE;
4431
4432         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4433         if (!nlh)
4434                 return -EMSGSIZE;
4435
4436         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4437         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4438             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4439                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4440                 nlmsg_cancel(skb, nlh);
4441                 return -EMSGSIZE;
4442         }
4443
4444         nlmsg_end(skb, nlh);
4445         return 0;
4446 }
4447
4448 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4449                                 u32 portid, u32 seq, int event, unsigned int flags)
4450 {
4451         struct nlmsghdr  *nlh;
4452         u8 scope = RT_SCOPE_UNIVERSE;
4453         int ifindex = ifaca->aca_idev->dev->ifindex;
4454
4455         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4456                 scope = RT_SCOPE_SITE;
4457
4458         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4459         if (!nlh)
4460                 return -EMSGSIZE;
4461
4462         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4463         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4464             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4465                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4466                 nlmsg_cancel(skb, nlh);
4467                 return -EMSGSIZE;
4468         }
4469
4470         nlmsg_end(skb, nlh);
4471         return 0;
4472 }
4473
4474 enum addr_type_t {
4475         UNICAST_ADDR,
4476         MULTICAST_ADDR,
4477         ANYCAST_ADDR,
4478 };
4479
4480 /* called with rcu_read_lock() */
4481 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4482                           struct netlink_callback *cb, enum addr_type_t type,
4483                           int s_ip_idx, int *p_ip_idx)
4484 {
4485         struct ifmcaddr6 *ifmca;
4486         struct ifacaddr6 *ifaca;
4487         int err = 1;
4488         int ip_idx = *p_ip_idx;
4489
4490         read_lock_bh(&idev->lock);
4491         switch (type) {
4492         case UNICAST_ADDR: {
4493                 struct inet6_ifaddr *ifa;
4494
4495                 /* unicast address incl. temp addr */
4496                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4497                         if (++ip_idx < s_ip_idx)
4498                                 continue;
4499                         err = inet6_fill_ifaddr(skb, ifa,
4500                                                 NETLINK_CB(cb->skb).portid,
4501                                                 cb->nlh->nlmsg_seq,
4502                                                 RTM_NEWADDR,
4503                                                 NLM_F_MULTI);
4504                         if (err < 0)
4505                                 break;
4506                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4507                 }
4508                 break;
4509         }
4510         case MULTICAST_ADDR:
4511                 /* multicast address */
4512                 for (ifmca = idev->mc_list; ifmca;
4513                      ifmca = ifmca->next, ip_idx++) {
4514                         if (ip_idx < s_ip_idx)
4515                                 continue;
4516                         err = inet6_fill_ifmcaddr(skb, ifmca,
4517                                                   NETLINK_CB(cb->skb).portid,
4518                                                   cb->nlh->nlmsg_seq,
4519                                                   RTM_GETMULTICAST,
4520                                                   NLM_F_MULTI);
4521                         if (err < 0)
4522                                 break;
4523                 }
4524                 break;
4525         case ANYCAST_ADDR:
4526                 /* anycast address */
4527                 for (ifaca = idev->ac_list; ifaca;
4528                      ifaca = ifaca->aca_next, ip_idx++) {
4529                         if (ip_idx < s_ip_idx)
4530                                 continue;
4531                         err = inet6_fill_ifacaddr(skb, ifaca,
4532                                                   NETLINK_CB(cb->skb).portid,
4533                                                   cb->nlh->nlmsg_seq,
4534                                                   RTM_GETANYCAST,
4535                                                   NLM_F_MULTI);
4536                         if (err < 0)
4537                                 break;
4538                 }
4539                 break;
4540         default:
4541                 break;
4542         }
4543         read_unlock_bh(&idev->lock);
4544         *p_ip_idx = ip_idx;
4545         return err;
4546 }
4547
4548 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4549                            enum addr_type_t type)
4550 {
4551         struct net *net = sock_net(skb->sk);
4552         int h, s_h;
4553         int idx, ip_idx;
4554         int s_idx, s_ip_idx;
4555         struct net_device *dev;
4556         struct inet6_dev *idev;
4557         struct hlist_head *head;
4558
4559         s_h = cb->args[0];
4560         s_idx = idx = cb->args[1];
4561         s_ip_idx = ip_idx = cb->args[2];
4562
4563         rcu_read_lock();
4564         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4565         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4566                 idx = 0;
4567                 head = &net->dev_index_head[h];
4568                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4569                         if (idx < s_idx)
4570                                 goto cont;
4571                         if (h > s_h || idx > s_idx)
4572                                 s_ip_idx = 0;
4573                         ip_idx = 0;
4574                         idev = __in6_dev_get(dev);
4575                         if (!idev)
4576                                 goto cont;
4577
4578                         if (in6_dump_addrs(idev, skb, cb, type,
4579                                            s_ip_idx, &ip_idx) < 0)
4580                                 goto done;
4581 cont:
4582                         idx++;
4583                 }
4584         }
4585 done:
4586         rcu_read_unlock();
4587         cb->args[0] = h;
4588         cb->args[1] = idx;
4589         cb->args[2] = ip_idx;
4590
4591         return skb->len;
4592 }
4593
4594 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4595 {
4596         enum addr_type_t type = UNICAST_ADDR;
4597
4598         return inet6_dump_addr(skb, cb, type);
4599 }
4600
4601 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4602 {
4603         enum addr_type_t type = MULTICAST_ADDR;
4604
4605         return inet6_dump_addr(skb, cb, type);
4606 }
4607
4608
4609 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4610 {
4611         enum addr_type_t type = ANYCAST_ADDR;
4612
4613         return inet6_dump_addr(skb, cb, type);
4614 }
4615
4616 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4617 {
4618         struct net *net = sock_net(in_skb->sk);
4619         struct ifaddrmsg *ifm;
4620         struct nlattr *tb[IFA_MAX+1];
4621         struct in6_addr *addr = NULL, *peer;
4622         struct net_device *dev = NULL;
4623         struct inet6_ifaddr *ifa;
4624         struct sk_buff *skb;
4625         int err;
4626
4627         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4628         if (err < 0)
4629                 goto errout;
4630
4631         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4632         if (!addr) {
4633                 err = -EINVAL;
4634                 goto errout;
4635         }
4636
4637         ifm = nlmsg_data(nlh);
4638         if (ifm->ifa_index)
4639                 dev = __dev_get_by_index(net, ifm->ifa_index);
4640
4641         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4642         if (!ifa) {
4643                 err = -EADDRNOTAVAIL;
4644                 goto errout;
4645         }
4646
4647         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4648         if (!skb) {
4649                 err = -ENOBUFS;
4650                 goto errout_ifa;
4651         }
4652
4653         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4654                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4655         if (err < 0) {
4656                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4657                 WARN_ON(err == -EMSGSIZE);
4658                 kfree_skb(skb);
4659                 goto errout_ifa;
4660         }
4661         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4662 errout_ifa:
4663         in6_ifa_put(ifa);
4664 errout:
4665         return err;
4666 }
4667
4668 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4669 {
4670         struct sk_buff *skb;
4671         struct net *net = dev_net(ifa->idev->dev);
4672         int err = -ENOBUFS;
4673
4674         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4675         if (!skb)
4676                 goto errout;
4677
4678         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4679         if (err < 0) {
4680                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4681                 WARN_ON(err == -EMSGSIZE);
4682                 kfree_skb(skb);
4683                 goto errout;
4684         }
4685         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4686         return;
4687 errout:
4688         if (err < 0)
4689                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4690 }
4691
4692 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4693                                 __s32 *array, int bytes)
4694 {
4695         BUG_ON(bytes < (DEVCONF_MAX * 4));
4696
4697         memset(array, 0, bytes);
4698         array[DEVCONF_FORWARDING] = cnf->forwarding;
4699         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4700         array[DEVCONF_MTU6] = cnf->mtu6;
4701         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4702         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4703         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4704         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4705         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4706         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4707                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4708         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4709                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4710         array[DEVCONF_RTR_SOLICIT_DELAY] =
4711                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4712         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4713         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4714                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4715         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4716                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4717         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4718         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4719         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4720         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4721         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4722         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4723         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4724         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4725         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4726 #ifdef CONFIG_IPV6_ROUTER_PREF
4727         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4728         array[DEVCONF_RTR_PROBE_INTERVAL] =
4729                 jiffies_to_msecs(cnf->rtr_probe_interval);
4730 #ifdef CONFIG_IPV6_ROUTE_INFO
4731         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
4732         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4733 #endif
4734 #endif
4735         array[DEVCONF_ACCEPT_RA_RT_TABLE] = cnf->accept_ra_rt_table;
4736         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4737         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4738 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4739         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4740         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4741 #endif
4742 #ifdef CONFIG_IPV6_MROUTE
4743         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4744 #endif
4745         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4746         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4747         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4748         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4749         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4750         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4751         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4752         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4753         /* we omit DEVCONF_STABLE_SECRET for now */
4754         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4755 }
4756
4757 static inline size_t inet6_ifla6_size(void)
4758 {
4759         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4760              + nla_total_size(sizeof(struct ifla_cacheinfo))
4761              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4762              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4763              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4764              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4765 }
4766
4767 static inline size_t inet6_if_nlmsg_size(void)
4768 {
4769         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4770                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4771                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4772                + nla_total_size(4) /* IFLA_MTU */
4773                + nla_total_size(4) /* IFLA_LINK */
4774                + nla_total_size(1) /* IFLA_OPERSTATE */
4775                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4776 }
4777
4778 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4779                                       int items, int bytes)
4780 {
4781         int i;
4782         int pad = bytes - sizeof(u64) * items;
4783         BUG_ON(pad < 0);
4784
4785         /* Use put_unaligned() because stats may not be aligned for u64. */
4786         put_unaligned(items, &stats[0]);
4787         for (i = 1; i < items; i++)
4788                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4789
4790         memset(&stats[items], 0, pad);
4791 }
4792
4793 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4794                                         int bytes, size_t syncpoff)
4795 {
4796         int i, c;
4797         u64 buff[IPSTATS_MIB_MAX];
4798         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4799
4800         BUG_ON(pad < 0);
4801
4802         memset(buff, 0, sizeof(buff));
4803         buff[0] = IPSTATS_MIB_MAX;
4804
4805         for_each_possible_cpu(c) {
4806                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4807                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4808         }
4809
4810         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4811         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4812 }
4813
4814 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4815                              int bytes)
4816 {
4817         switch (attrtype) {
4818         case IFLA_INET6_STATS:
4819                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4820                                      offsetof(struct ipstats_mib, syncp));
4821                 break;
4822         case IFLA_INET6_ICMP6STATS:
4823                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4824                 break;
4825         }
4826 }
4827
4828 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4829                                   u32 ext_filter_mask)
4830 {
4831         struct nlattr *nla;
4832         struct ifla_cacheinfo ci;
4833
4834         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4835                 goto nla_put_failure;
4836         ci.max_reasm_len = IPV6_MAXPLEN;
4837         ci.tstamp = cstamp_delta(idev->tstamp);
4838         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4839         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4840         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4841                 goto nla_put_failure;
4842         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4843         if (!nla)
4844                 goto nla_put_failure;
4845         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4846
4847         /* XXX - MC not implemented */
4848
4849         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4850                 return 0;
4851
4852         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4853         if (!nla)
4854                 goto nla_put_failure;
4855         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4856
4857         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4858         if (!nla)
4859                 goto nla_put_failure;
4860         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4861
4862         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4863         if (!nla)
4864                 goto nla_put_failure;
4865
4866         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4867                 goto nla_put_failure;
4868
4869         read_lock_bh(&idev->lock);
4870         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4871         read_unlock_bh(&idev->lock);
4872
4873         return 0;
4874
4875 nla_put_failure:
4876         return -EMSGSIZE;
4877 }
4878
4879 static size_t inet6_get_link_af_size(const struct net_device *dev,
4880                                      u32 ext_filter_mask)
4881 {
4882         if (!__in6_dev_get(dev))
4883                 return 0;
4884
4885         return inet6_ifla6_size();
4886 }
4887
4888 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4889                               u32 ext_filter_mask)
4890 {
4891         struct inet6_dev *idev = __in6_dev_get(dev);
4892
4893         if (!idev)
4894                 return -ENODATA;
4895
4896         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4897                 return -EMSGSIZE;
4898
4899         return 0;
4900 }
4901
4902 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4903 {
4904         struct inet6_ifaddr *ifp;
4905         struct net_device *dev = idev->dev;
4906         bool update_rs = false;
4907         struct in6_addr ll_addr;
4908
4909         ASSERT_RTNL();
4910
4911         if (!token)
4912                 return -EINVAL;
4913         if (ipv6_addr_any(token))
4914                 return -EINVAL;
4915         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4916                 return -EINVAL;
4917         if (!ipv6_accept_ra(idev))
4918                 return -EINVAL;
4919         if (idev->cnf.rtr_solicits == 0)
4920                 return -EINVAL;
4921
4922         write_lock_bh(&idev->lock);
4923
4924         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4925         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4926
4927         write_unlock_bh(&idev->lock);
4928
4929         if (!idev->dead && (idev->if_flags & IF_READY) &&
4930             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4931                              IFA_F_OPTIMISTIC)) {
4932
4933                 /* If we're not ready, then normal ifup will take care
4934                  * of this. Otherwise, we need to request our rs here.
4935                  */
4936                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4937                 update_rs = true;
4938         }
4939
4940         write_lock_bh(&idev->lock);
4941
4942         if (update_rs) {
4943                 idev->if_flags |= IF_RS_SENT;
4944                 idev->rs_interval = rfc3315_s14_backoff_init(
4945                         idev->cnf.rtr_solicit_interval);
4946                 idev->rs_probes = 1;
4947                 addrconf_mod_rs_timer(idev, idev->rs_interval);
4948         }
4949
4950         /* Well, that's kinda nasty ... */
4951         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4952                 spin_lock(&ifp->lock);
4953                 if (ifp->tokenized) {
4954                         ifp->valid_lft = 0;
4955                         ifp->prefered_lft = 0;
4956                 }
4957                 spin_unlock(&ifp->lock);
4958         }
4959
4960         write_unlock_bh(&idev->lock);
4961         inet6_ifinfo_notify(RTM_NEWLINK, idev);
4962         addrconf_verify_rtnl();
4963         return 0;
4964 }
4965
4966 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4967         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
4968         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
4969 };
4970
4971 static int inet6_validate_link_af(const struct net_device *dev,
4972                                   const struct nlattr *nla)
4973 {
4974         struct nlattr *tb[IFLA_INET6_MAX + 1];
4975
4976         if (dev && !__in6_dev_get(dev))
4977                 return -EAFNOSUPPORT;
4978
4979         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4980 }
4981
4982 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4983 {
4984         int err = -EINVAL;
4985         struct inet6_dev *idev = __in6_dev_get(dev);
4986         struct nlattr *tb[IFLA_INET6_MAX + 1];
4987
4988         if (!idev)
4989                 return -EAFNOSUPPORT;
4990
4991         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4992                 BUG();
4993
4994         if (tb[IFLA_INET6_TOKEN]) {
4995                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4996                 if (err)
4997                         return err;
4998         }
4999
5000         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5001                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5002
5003                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5004                     mode != IN6_ADDR_GEN_MODE_NONE &&
5005                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
5006                         return -EINVAL;
5007
5008                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5009                     !idev->cnf.stable_secret.initialized &&
5010                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5011                         return -EINVAL;
5012
5013                 idev->addr_gen_mode = mode;
5014                 err = 0;
5015         }
5016
5017         return err;
5018 }
5019
5020 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5021                              u32 portid, u32 seq, int event, unsigned int flags)
5022 {
5023         struct net_device *dev = idev->dev;
5024         struct ifinfomsg *hdr;
5025         struct nlmsghdr *nlh;
5026         void *protoinfo;
5027
5028         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5029         if (!nlh)
5030                 return -EMSGSIZE;
5031
5032         hdr = nlmsg_data(nlh);
5033         hdr->ifi_family = AF_INET6;
5034         hdr->__ifi_pad = 0;
5035         hdr->ifi_type = dev->type;
5036         hdr->ifi_index = dev->ifindex;
5037         hdr->ifi_flags = dev_get_flags(dev);
5038         hdr->ifi_change = 0;
5039
5040         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5041             (dev->addr_len &&
5042              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5043             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5044             (dev->ifindex != dev_get_iflink(dev) &&
5045              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5046             nla_put_u8(skb, IFLA_OPERSTATE,
5047                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5048                 goto nla_put_failure;
5049         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5050         if (!protoinfo)
5051                 goto nla_put_failure;
5052
5053         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5054                 goto nla_put_failure;
5055
5056         nla_nest_end(skb, protoinfo);
5057         nlmsg_end(skb, nlh);
5058         return 0;
5059
5060 nla_put_failure:
5061         nlmsg_cancel(skb, nlh);
5062         return -EMSGSIZE;
5063 }
5064
5065 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5066 {
5067         struct net *net = sock_net(skb->sk);
5068         int h, s_h;
5069         int idx = 0, s_idx;
5070         struct net_device *dev;
5071         struct inet6_dev *idev;
5072         struct hlist_head *head;
5073
5074         s_h = cb->args[0];
5075         s_idx = cb->args[1];
5076
5077         rcu_read_lock();
5078         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5079                 idx = 0;
5080                 head = &net->dev_index_head[h];
5081                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5082                         if (idx < s_idx)
5083                                 goto cont;
5084                         idev = __in6_dev_get(dev);
5085                         if (!idev)
5086                                 goto cont;
5087                         if (inet6_fill_ifinfo(skb, idev,
5088                                               NETLINK_CB(cb->skb).portid,
5089                                               cb->nlh->nlmsg_seq,
5090                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5091                                 goto out;
5092 cont:
5093                         idx++;
5094                 }
5095         }
5096 out:
5097         rcu_read_unlock();
5098         cb->args[1] = idx;
5099         cb->args[0] = h;
5100
5101         return skb->len;
5102 }
5103
5104 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5105 {
5106         struct sk_buff *skb;
5107         struct net *net = dev_net(idev->dev);
5108         int err = -ENOBUFS;
5109
5110         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5111         if (!skb)
5112                 goto errout;
5113
5114         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5115         if (err < 0) {
5116                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5117                 WARN_ON(err == -EMSGSIZE);
5118                 kfree_skb(skb);
5119                 goto errout;
5120         }
5121         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5122         return;
5123 errout:
5124         if (err < 0)
5125                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5126 }
5127
5128 static inline size_t inet6_prefix_nlmsg_size(void)
5129 {
5130         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5131                + nla_total_size(sizeof(struct in6_addr))
5132                + nla_total_size(sizeof(struct prefix_cacheinfo));
5133 }
5134
5135 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5136                              struct prefix_info *pinfo, u32 portid, u32 seq,
5137                              int event, unsigned int flags)
5138 {
5139         struct prefixmsg *pmsg;
5140         struct nlmsghdr *nlh;
5141         struct prefix_cacheinfo ci;
5142
5143         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5144         if (!nlh)
5145                 return -EMSGSIZE;
5146
5147         pmsg = nlmsg_data(nlh);
5148         pmsg->prefix_family = AF_INET6;
5149         pmsg->prefix_pad1 = 0;
5150         pmsg->prefix_pad2 = 0;
5151         pmsg->prefix_ifindex = idev->dev->ifindex;
5152         pmsg->prefix_len = pinfo->prefix_len;
5153         pmsg->prefix_type = pinfo->type;
5154         pmsg->prefix_pad3 = 0;
5155         pmsg->prefix_flags = 0;
5156         if (pinfo->onlink)
5157                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5158         if (pinfo->autoconf)
5159                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5160
5161         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5162                 goto nla_put_failure;
5163         ci.preferred_time = ntohl(pinfo->prefered);
5164         ci.valid_time = ntohl(pinfo->valid);
5165         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5166                 goto nla_put_failure;
5167         nlmsg_end(skb, nlh);
5168         return 0;
5169
5170 nla_put_failure:
5171         nlmsg_cancel(skb, nlh);
5172         return -EMSGSIZE;
5173 }
5174
5175 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5176                          struct prefix_info *pinfo)
5177 {
5178         struct sk_buff *skb;
5179         struct net *net = dev_net(idev->dev);
5180         int err = -ENOBUFS;
5181
5182         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5183         if (!skb)
5184                 goto errout;
5185
5186         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5187         if (err < 0) {
5188                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5189                 WARN_ON(err == -EMSGSIZE);
5190                 kfree_skb(skb);
5191                 goto errout;
5192         }
5193         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5194         return;
5195 errout:
5196         if (err < 0)
5197                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5198 }
5199
5200 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5201 {
5202         struct net *net = dev_net(ifp->idev->dev);
5203
5204         if (event)
5205                 ASSERT_RTNL();
5206
5207         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5208
5209         switch (event) {
5210         case RTM_NEWADDR:
5211                 /*
5212                  * If the address was optimistic
5213                  * we inserted the route at the start of
5214                  * our DAD process, so we don't need
5215                  * to do it again
5216                  */
5217                 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5218                         ip6_ins_rt(ifp->rt);
5219                 if (ifp->idev->cnf.forwarding)
5220                         addrconf_join_anycast(ifp);
5221                 if (!ipv6_addr_any(&ifp->peer_addr))
5222                         addrconf_prefix_route(&ifp->peer_addr, 128,
5223                                               ifp->idev->dev, 0, 0);
5224                 break;
5225         case RTM_DELADDR:
5226                 if (ifp->idev->cnf.forwarding)
5227                         addrconf_leave_anycast(ifp);
5228                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5229                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5230                         struct rt6_info *rt;
5231
5232                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5233                                                        ifp->idev->dev, 0, 0);
5234                         if (rt)
5235                                 ip6_del_rt(rt);
5236                 }
5237                 dst_hold(&ifp->rt->dst);
5238
5239                 ip6_del_rt(ifp->rt);
5240
5241                 rt_genid_bump_ipv6(net);
5242                 break;
5243         }
5244         atomic_inc(&net->ipv6.dev_addr_genid);
5245 }
5246
5247 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5248 {
5249         rcu_read_lock_bh();
5250         if (likely(ifp->idev->dead == 0))
5251                 __ipv6_ifa_notify(event, ifp);
5252         rcu_read_unlock_bh();
5253 }
5254
5255 #ifdef CONFIG_SYSCTL
5256
5257 static
5258 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5259                            void __user *buffer, size_t *lenp, loff_t *ppos)
5260 {
5261         int *valp = ctl->data;
5262         int val = *valp;
5263         loff_t pos = *ppos;
5264         struct ctl_table lctl;
5265         int ret;
5266
5267         /*
5268          * ctl->data points to idev->cnf.forwarding, we should
5269          * not modify it until we get the rtnl lock.
5270          */
5271         lctl = *ctl;
5272         lctl.data = &val;
5273
5274         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5275
5276         if (write)
5277                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5278         if (ret)
5279                 *ppos = pos;
5280         return ret;
5281 }
5282
5283 static
5284 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5285                         void __user *buffer, size_t *lenp, loff_t *ppos)
5286 {
5287         struct inet6_dev *idev = ctl->extra1;
5288         int min_mtu = IPV6_MIN_MTU;
5289         struct ctl_table lctl;
5290
5291         lctl = *ctl;
5292         lctl.extra1 = &min_mtu;
5293         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5294
5295         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5296 }
5297
5298 static void dev_disable_change(struct inet6_dev *idev)
5299 {
5300         struct netdev_notifier_info info;
5301
5302         if (!idev || !idev->dev)
5303                 return;
5304
5305         netdev_notifier_info_init(&info, idev->dev);
5306         if (idev->cnf.disable_ipv6)
5307                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5308         else
5309                 addrconf_notify(NULL, NETDEV_UP, &info);
5310 }
5311
5312 static void addrconf_disable_change(struct net *net, __s32 newf)
5313 {
5314         struct net_device *dev;
5315         struct inet6_dev *idev;
5316
5317         for_each_netdev(net, dev) {
5318                 idev = __in6_dev_get(dev);
5319                 if (idev) {
5320                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5321                         idev->cnf.disable_ipv6 = newf;
5322                         if (changed)
5323                                 dev_disable_change(idev);
5324                 }
5325         }
5326 }
5327
5328 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5329 {
5330         struct net *net;
5331         int old;
5332
5333         if (!rtnl_trylock())
5334                 return restart_syscall();
5335
5336         net = (struct net *)table->extra2;
5337         old = *p;
5338         *p = newf;
5339
5340         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5341                 rtnl_unlock();
5342                 return 0;
5343         }
5344
5345         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5346                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5347                 addrconf_disable_change(net, newf);
5348         } else if ((!newf) ^ (!old))
5349                 dev_disable_change((struct inet6_dev *)table->extra1);
5350
5351         rtnl_unlock();
5352         return 0;
5353 }
5354
5355 static
5356 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5357                             void __user *buffer, size_t *lenp, loff_t *ppos)
5358 {
5359         int *valp = ctl->data;
5360         int val = *valp;
5361         loff_t pos = *ppos;
5362         struct ctl_table lctl;
5363         int ret;
5364
5365         /*
5366          * ctl->data points to idev->cnf.disable_ipv6, we should
5367          * not modify it until we get the rtnl lock.
5368          */
5369         lctl = *ctl;
5370         lctl.data = &val;
5371
5372         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5373
5374         if (write)
5375                 ret = addrconf_disable_ipv6(ctl, valp, val);
5376         if (ret)
5377                 *ppos = pos;
5378         return ret;
5379 }
5380
5381 static
5382 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5383                               void __user *buffer, size_t *lenp, loff_t *ppos)
5384 {
5385         int *valp = ctl->data;
5386         int ret;
5387         int old, new;
5388
5389         old = *valp;
5390         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5391         new = *valp;
5392
5393         if (write && old != new) {
5394                 struct net *net = ctl->extra2;
5395
5396                 if (!rtnl_trylock())
5397                         return restart_syscall();
5398
5399                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5400                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5401                                                      NETCONFA_IFINDEX_DEFAULT,
5402                                                      net->ipv6.devconf_dflt);
5403                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5404                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5405                                                      NETCONFA_IFINDEX_ALL,
5406                                                      net->ipv6.devconf_all);
5407                 else {
5408                         struct inet6_dev *idev = ctl->extra1;
5409
5410                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5411                                                      idev->dev->ifindex,
5412                                                      &idev->cnf);
5413                 }
5414                 rtnl_unlock();
5415         }
5416
5417         return ret;
5418 }
5419
5420 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5421                                          void __user *buffer, size_t *lenp,
5422                                          loff_t *ppos)
5423 {
5424         int err;
5425         struct in6_addr addr;
5426         char str[IPV6_MAX_STRLEN];
5427         struct ctl_table lctl = *ctl;
5428         struct net *net = ctl->extra2;
5429         struct ipv6_stable_secret *secret = ctl->data;
5430
5431         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5432                 return -EIO;
5433
5434         lctl.maxlen = IPV6_MAX_STRLEN;
5435         lctl.data = str;
5436
5437         if (!rtnl_trylock())
5438                 return restart_syscall();
5439
5440         if (!write && !secret->initialized) {
5441                 err = -EIO;
5442                 goto out;
5443         }
5444
5445         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5446         if (err >= sizeof(str)) {
5447                 err = -EIO;
5448                 goto out;
5449         }
5450
5451         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5452         if (err || !write)
5453                 goto out;
5454
5455         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5456                 err = -EIO;
5457                 goto out;
5458         }
5459
5460         secret->initialized = true;
5461         secret->secret = addr;
5462
5463         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5464                 struct net_device *dev;
5465
5466                 for_each_netdev(net, dev) {
5467                         struct inet6_dev *idev = __in6_dev_get(dev);
5468
5469                         if (idev) {
5470                                 idev->addr_gen_mode =
5471                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5472                         }
5473                 }
5474         } else {
5475                 struct inet6_dev *idev = ctl->extra1;
5476
5477                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5478         }
5479
5480 out:
5481         rtnl_unlock();
5482
5483         return err;
5484 }
5485
5486 static
5487 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5488                                                 int write,
5489                                                 void __user *buffer,
5490                                                 size_t *lenp,
5491                                                 loff_t *ppos)
5492 {
5493         int *valp = ctl->data;
5494         int val = *valp;
5495         loff_t pos = *ppos;
5496         struct ctl_table lctl;
5497         int ret;
5498
5499         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5500          * we should not modify it until we get the rtnl lock.
5501          */
5502         lctl = *ctl;
5503         lctl.data = &val;
5504
5505         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5506
5507         if (write)
5508                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5509         if (ret)
5510                 *ppos = pos;
5511         return ret;
5512 }
5513
5514 static struct addrconf_sysctl_table
5515 {
5516         struct ctl_table_header *sysctl_header;
5517         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5518 } addrconf_sysctl __read_mostly = {
5519         .sysctl_header = NULL,
5520         .addrconf_vars = {
5521                 {
5522                         .procname       = "forwarding",
5523                         .data           = &ipv6_devconf.forwarding,
5524                         .maxlen         = sizeof(int),
5525                         .mode           = 0644,
5526                         .proc_handler   = addrconf_sysctl_forward,
5527                 },
5528                 {
5529                         .procname       = "hop_limit",
5530                         .data           = &ipv6_devconf.hop_limit,
5531                         .maxlen         = sizeof(int),
5532                         .mode           = 0644,
5533                         .proc_handler   = proc_dointvec,
5534                 },
5535                 {
5536                         .procname       = "mtu",
5537                         .data           = &ipv6_devconf.mtu6,
5538                         .maxlen         = sizeof(int),
5539                         .mode           = 0644,
5540                         .proc_handler   = addrconf_sysctl_mtu,
5541                 },
5542                 {
5543                         .procname       = "accept_ra",
5544                         .data           = &ipv6_devconf.accept_ra,
5545                         .maxlen         = sizeof(int),
5546                         .mode           = 0644,
5547                         .proc_handler   = proc_dointvec,
5548                 },
5549                 {
5550                         .procname       = "accept_redirects",
5551                         .data           = &ipv6_devconf.accept_redirects,
5552                         .maxlen         = sizeof(int),
5553                         .mode           = 0644,
5554                         .proc_handler   = proc_dointvec,
5555                 },
5556                 {
5557                         .procname       = "autoconf",
5558                         .data           = &ipv6_devconf.autoconf,
5559                         .maxlen         = sizeof(int),
5560                         .mode           = 0644,
5561                         .proc_handler   = proc_dointvec,
5562                 },
5563                 {
5564                         .procname       = "dad_transmits",
5565                         .data           = &ipv6_devconf.dad_transmits,
5566                         .maxlen         = sizeof(int),
5567                         .mode           = 0644,
5568                         .proc_handler   = proc_dointvec,
5569                 },
5570                 {
5571                         .procname       = "router_solicitations",
5572                         .data           = &ipv6_devconf.rtr_solicits,
5573                         .maxlen         = sizeof(int),
5574                         .mode           = 0644,
5575                         .proc_handler   = proc_dointvec,
5576                 },
5577                 {
5578                         .procname       = "router_solicitation_interval",
5579                         .data           = &ipv6_devconf.rtr_solicit_interval,
5580                         .maxlen         = sizeof(int),
5581                         .mode           = 0644,
5582                         .proc_handler   = proc_dointvec_jiffies,
5583                 },
5584                 {
5585                         .procname       = "router_solicitation_max_interval",
5586                         .data           = &ipv6_devconf.rtr_solicit_max_interval,
5587                         .maxlen         = sizeof(int),
5588                         .mode           = 0644,
5589                         .proc_handler   = proc_dointvec_jiffies,
5590                 },
5591                 {
5592                         .procname       = "router_solicitation_delay",
5593                         .data           = &ipv6_devconf.rtr_solicit_delay,
5594                         .maxlen         = sizeof(int),
5595                         .mode           = 0644,
5596                         .proc_handler   = proc_dointvec_jiffies,
5597                 },
5598                 {
5599                         .procname       = "force_mld_version",
5600                         .data           = &ipv6_devconf.force_mld_version,
5601                         .maxlen         = sizeof(int),
5602                         .mode           = 0644,
5603                         .proc_handler   = proc_dointvec,
5604                 },
5605                 {
5606                         .procname       = "mldv1_unsolicited_report_interval",
5607                         .data           =
5608                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
5609                         .maxlen         = sizeof(int),
5610                         .mode           = 0644,
5611                         .proc_handler   = proc_dointvec_ms_jiffies,
5612                 },
5613                 {
5614                         .procname       = "mldv2_unsolicited_report_interval",
5615                         .data           =
5616                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
5617                         .maxlen         = sizeof(int),
5618                         .mode           = 0644,
5619                         .proc_handler   = proc_dointvec_ms_jiffies,
5620                 },
5621                 {
5622                         .procname       = "use_tempaddr",
5623                         .data           = &ipv6_devconf.use_tempaddr,
5624                         .maxlen         = sizeof(int),
5625                         .mode           = 0644,
5626                         .proc_handler   = proc_dointvec,
5627                 },
5628                 {
5629                         .procname       = "temp_valid_lft",
5630                         .data           = &ipv6_devconf.temp_valid_lft,
5631                         .maxlen         = sizeof(int),
5632                         .mode           = 0644,
5633                         .proc_handler   = proc_dointvec,
5634                 },
5635                 {
5636                         .procname       = "temp_prefered_lft",
5637                         .data           = &ipv6_devconf.temp_prefered_lft,
5638                         .maxlen         = sizeof(int),
5639                         .mode           = 0644,
5640                         .proc_handler   = proc_dointvec,
5641                 },
5642                 {
5643                         .procname       = "regen_max_retry",
5644                         .data           = &ipv6_devconf.regen_max_retry,
5645                         .maxlen         = sizeof(int),
5646                         .mode           = 0644,
5647                         .proc_handler   = proc_dointvec,
5648                 },
5649                 {
5650                         .procname       = "max_desync_factor",
5651                         .data           = &ipv6_devconf.max_desync_factor,
5652                         .maxlen         = sizeof(int),
5653                         .mode           = 0644,
5654                         .proc_handler   = proc_dointvec,
5655                 },
5656                 {
5657                         .procname       = "max_addresses",
5658                         .data           = &ipv6_devconf.max_addresses,
5659                         .maxlen         = sizeof(int),
5660                         .mode           = 0644,
5661                         .proc_handler   = proc_dointvec,
5662                 },
5663                 {
5664                         .procname       = "accept_ra_defrtr",
5665                         .data           = &ipv6_devconf.accept_ra_defrtr,
5666                         .maxlen         = sizeof(int),
5667                         .mode           = 0644,
5668                         .proc_handler   = proc_dointvec,
5669                 },
5670                 {
5671                         .procname       = "accept_ra_min_hop_limit",
5672                         .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5673                         .maxlen         = sizeof(int),
5674                         .mode           = 0644,
5675                         .proc_handler   = proc_dointvec,
5676                 },
5677                 {
5678                         .procname       = "accept_ra_pinfo",
5679                         .data           = &ipv6_devconf.accept_ra_pinfo,
5680                         .maxlen         = sizeof(int),
5681                         .mode           = 0644,
5682                         .proc_handler   = proc_dointvec,
5683                 },
5684 #ifdef CONFIG_IPV6_ROUTER_PREF
5685                 {
5686                         .procname       = "accept_ra_rtr_pref",
5687                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
5688                         .maxlen         = sizeof(int),
5689                         .mode           = 0644,
5690                         .proc_handler   = proc_dointvec,
5691                 },
5692                 {
5693                         .procname       = "router_probe_interval",
5694                         .data           = &ipv6_devconf.rtr_probe_interval,
5695                         .maxlen         = sizeof(int),
5696                         .mode           = 0644,
5697                         .proc_handler   = proc_dointvec_jiffies,
5698                 },
5699 #ifdef CONFIG_IPV6_ROUTE_INFO
5700                 {
5701                         .procname       = "accept_ra_rt_info_min_plen",
5702                         .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
5703                         .maxlen         = sizeof(int),
5704                         .mode           = 0644,
5705                         .proc_handler   = proc_dointvec,
5706                 },
5707                 {
5708                         .procname       = "accept_ra_rt_info_max_plen",
5709                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5710                         .maxlen         = sizeof(int),
5711                         .mode           = 0644,
5712                         .proc_handler   = proc_dointvec,
5713                 },
5714 #endif
5715 #endif
5716                 {
5717                         .procname       = "accept_ra_rt_table",
5718                         .data           = &ipv6_devconf.accept_ra_rt_table,
5719                         .maxlen         = sizeof(int),
5720                         .mode           = 0644,
5721                         .proc_handler   = proc_dointvec,
5722                 },
5723                 {
5724                         .procname       = "proxy_ndp",
5725                         .data           = &ipv6_devconf.proxy_ndp,
5726                         .maxlen         = sizeof(int),
5727                         .mode           = 0644,
5728                         .proc_handler   = addrconf_sysctl_proxy_ndp,
5729                 },
5730                 {
5731                         .procname       = "accept_source_route",
5732                         .data           = &ipv6_devconf.accept_source_route,
5733                         .maxlen         = sizeof(int),
5734                         .mode           = 0644,
5735                         .proc_handler   = proc_dointvec,
5736                 },
5737 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5738                 {
5739                         .procname       = "optimistic_dad",
5740                         .data           = &ipv6_devconf.optimistic_dad,
5741                         .maxlen         = sizeof(int),
5742                         .mode           = 0644,
5743                         .proc_handler   = proc_dointvec,
5744
5745                 },
5746                 {
5747                         .procname       = "use_optimistic",
5748                         .data           = &ipv6_devconf.use_optimistic,
5749                         .maxlen         = sizeof(int),
5750                         .mode           = 0644,
5751                         .proc_handler   = proc_dointvec,
5752
5753                 },
5754 #endif
5755 #ifdef CONFIG_IPV6_MROUTE
5756                 {
5757                         .procname       = "mc_forwarding",
5758                         .data           = &ipv6_devconf.mc_forwarding,
5759                         .maxlen         = sizeof(int),
5760                         .mode           = 0444,
5761                         .proc_handler   = proc_dointvec,
5762                 },
5763 #endif
5764                 {
5765                         .procname       = "disable_ipv6",
5766                         .data           = &ipv6_devconf.disable_ipv6,
5767                         .maxlen         = sizeof(int),
5768                         .mode           = 0644,
5769                         .proc_handler   = addrconf_sysctl_disable,
5770                 },
5771                 {
5772                         .procname       = "accept_dad",
5773                         .data           = &ipv6_devconf.accept_dad,
5774                         .maxlen         = sizeof(int),
5775                         .mode           = 0644,
5776                         .proc_handler   = proc_dointvec,
5777                 },
5778                 {
5779                         .procname       = "force_tllao",
5780                         .data           = &ipv6_devconf.force_tllao,
5781                         .maxlen         = sizeof(int),
5782                         .mode           = 0644,
5783                         .proc_handler   = proc_dointvec
5784                 },
5785                 {
5786                         .procname       = "ndisc_notify",
5787                         .data           = &ipv6_devconf.ndisc_notify,
5788                         .maxlen         = sizeof(int),
5789                         .mode           = 0644,
5790                         .proc_handler   = proc_dointvec
5791                 },
5792                 {
5793                         .procname       = "suppress_frag_ndisc",
5794                         .data           = &ipv6_devconf.suppress_frag_ndisc,
5795                         .maxlen         = sizeof(int),
5796                         .mode           = 0644,
5797                         .proc_handler   = proc_dointvec
5798                 },
5799                 {
5800                         .procname       = "accept_ra_from_local",
5801                         .data           = &ipv6_devconf.accept_ra_from_local,
5802                         .maxlen         = sizeof(int),
5803                         .mode           = 0644,
5804                         .proc_handler   = proc_dointvec,
5805                 },
5806                 {
5807                         .procname       = "accept_ra_mtu",
5808                         .data           = &ipv6_devconf.accept_ra_mtu,
5809                         .maxlen         = sizeof(int),
5810                         .mode           = 0644,
5811                         .proc_handler   = proc_dointvec,
5812                 },
5813                 {
5814                         .procname       = "stable_secret",
5815                         .data           = &ipv6_devconf.stable_secret,
5816                         .maxlen         = IPV6_MAX_STRLEN,
5817                         .mode           = 0600,
5818                         .proc_handler   = addrconf_sysctl_stable_secret,
5819                 },
5820                 {
5821                         .procname       = "use_oif_addrs_only",
5822                         .data           = &ipv6_devconf.use_oif_addrs_only,
5823                         .maxlen         = sizeof(int),
5824                         .mode           = 0644,
5825                         .proc_handler   = proc_dointvec,
5826                 },
5827                 {
5828                         .procname       = "ignore_routes_with_linkdown",
5829                         .data           = &ipv6_devconf.ignore_routes_with_linkdown,
5830                         .maxlen         = sizeof(int),
5831                         .mode           = 0644,
5832                         .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
5833                 },
5834                 {
5835                         /* sentinel */
5836                 }
5837         },
5838 };
5839
5840 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5841                 struct inet6_dev *idev, struct ipv6_devconf *p)
5842 {
5843         int i;
5844         struct addrconf_sysctl_table *t;
5845         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5846
5847         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5848         if (!t)
5849                 goto out;
5850
5851         for (i = 0; t->addrconf_vars[i].data; i++) {
5852                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5853                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5854                 t->addrconf_vars[i].extra2 = net;
5855         }
5856
5857         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5858
5859         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5860         if (!t->sysctl_header)
5861                 goto free;
5862
5863         p->sysctl = t;
5864         return 0;
5865
5866 free:
5867         kfree(t);
5868 out:
5869         return -ENOBUFS;
5870 }
5871
5872 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5873 {
5874         struct addrconf_sysctl_table *t;
5875
5876         if (!p->sysctl)
5877                 return;
5878
5879         t = p->sysctl;
5880         p->sysctl = NULL;
5881         unregister_net_sysctl_table(t->sysctl_header);
5882         kfree(t);
5883 }
5884
5885 static int addrconf_sysctl_register(struct inet6_dev *idev)
5886 {
5887         int err;
5888
5889         if (!sysctl_dev_name_is_allowed(idev->dev->name))
5890                 return -EINVAL;
5891
5892         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5893                                     &ndisc_ifinfo_sysctl_change);
5894         if (err)
5895                 return err;
5896         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5897                                          idev, &idev->cnf);
5898         if (err)
5899                 neigh_sysctl_unregister(idev->nd_parms);
5900
5901         return err;
5902 }
5903
5904 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5905 {
5906         __addrconf_sysctl_unregister(&idev->cnf);
5907         neigh_sysctl_unregister(idev->nd_parms);
5908 }
5909
5910
5911 #endif
5912
5913 static int __net_init addrconf_init_net(struct net *net)
5914 {
5915         int err = -ENOMEM;
5916         struct ipv6_devconf *all, *dflt;
5917
5918         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5919         if (!all)
5920                 goto err_alloc_all;
5921
5922         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5923         if (!dflt)
5924                 goto err_alloc_dflt;
5925
5926         /* these will be inherited by all namespaces */
5927         dflt->autoconf = ipv6_defaults.autoconf;
5928         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5929
5930         dflt->stable_secret.initialized = false;
5931         all->stable_secret.initialized = false;
5932
5933         net->ipv6.devconf_all = all;
5934         net->ipv6.devconf_dflt = dflt;
5935
5936 #ifdef CONFIG_SYSCTL
5937         err = __addrconf_sysctl_register(net, "all", NULL, all);
5938         if (err < 0)
5939                 goto err_reg_all;
5940
5941         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5942         if (err < 0)
5943                 goto err_reg_dflt;
5944 #endif
5945         return 0;
5946
5947 #ifdef CONFIG_SYSCTL
5948 err_reg_dflt:
5949         __addrconf_sysctl_unregister(all);
5950 err_reg_all:
5951         kfree(dflt);
5952 #endif
5953 err_alloc_dflt:
5954         kfree(all);
5955 err_alloc_all:
5956         return err;
5957 }
5958
5959 static void __net_exit addrconf_exit_net(struct net *net)
5960 {
5961 #ifdef CONFIG_SYSCTL
5962         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5963         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5964 #endif
5965         kfree(net->ipv6.devconf_dflt);
5966         kfree(net->ipv6.devconf_all);
5967 }
5968
5969 static struct pernet_operations addrconf_ops = {
5970         .init = addrconf_init_net,
5971         .exit = addrconf_exit_net,
5972 };
5973
5974 static struct rtnl_af_ops inet6_ops __read_mostly = {
5975         .family           = AF_INET6,
5976         .fill_link_af     = inet6_fill_link_af,
5977         .get_link_af_size = inet6_get_link_af_size,
5978         .validate_link_af = inet6_validate_link_af,
5979         .set_link_af      = inet6_set_link_af,
5980 };
5981
5982 /*
5983  *      Init / cleanup code
5984  */
5985
5986 int __init addrconf_init(void)
5987 {
5988         struct inet6_dev *idev;
5989         int i, err;
5990
5991         err = ipv6_addr_label_init();
5992         if (err < 0) {
5993                 pr_crit("%s: cannot initialize default policy table: %d\n",
5994                         __func__, err);
5995                 goto out;
5996         }
5997
5998         err = register_pernet_subsys(&addrconf_ops);
5999         if (err < 0)
6000                 goto out_addrlabel;
6001
6002         addrconf_wq = create_workqueue("ipv6_addrconf");
6003         if (!addrconf_wq) {
6004                 err = -ENOMEM;
6005                 goto out_nowq;
6006         }
6007
6008         /* The addrconf netdev notifier requires that loopback_dev
6009          * has it's ipv6 private information allocated and setup
6010          * before it can bring up and give link-local addresses
6011          * to other devices which are up.
6012          *
6013          * Unfortunately, loopback_dev is not necessarily the first
6014          * entry in the global dev_base list of net devices.  In fact,
6015          * it is likely to be the very last entry on that list.
6016          * So this causes the notifier registry below to try and
6017          * give link-local addresses to all devices besides loopback_dev
6018          * first, then loopback_dev, which cases all the non-loopback_dev
6019          * devices to fail to get a link-local address.
6020          *
6021          * So, as a temporary fix, allocate the ipv6 structure for
6022          * loopback_dev first by hand.
6023          * Longer term, all of the dependencies ipv6 has upon the loopback
6024          * device and it being up should be removed.
6025          */
6026         rtnl_lock();
6027         idev = ipv6_add_dev(init_net.loopback_dev);
6028         rtnl_unlock();
6029         if (IS_ERR(idev)) {
6030                 err = PTR_ERR(idev);
6031                 goto errlo;
6032         }
6033
6034         ip6_route_init_special_entries();
6035
6036         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6037                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6038
6039         register_netdevice_notifier(&ipv6_dev_notf);
6040
6041         addrconf_verify();
6042
6043         rtnl_af_register(&inet6_ops);
6044
6045         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6046                               NULL);
6047         if (err < 0)
6048                 goto errout;
6049
6050         /* Only the first call to __rtnl_register can fail */
6051         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6052         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6053         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6054                         inet6_dump_ifaddr, NULL);
6055         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6056                         inet6_dump_ifmcaddr, NULL);
6057         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6058                         inet6_dump_ifacaddr, NULL);
6059         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6060                         inet6_netconf_dump_devconf, NULL);
6061
6062         ipv6_addr_label_rtnl_register();
6063
6064         return 0;
6065 errout:
6066         rtnl_af_unregister(&inet6_ops);
6067         unregister_netdevice_notifier(&ipv6_dev_notf);
6068 errlo:
6069         destroy_workqueue(addrconf_wq);
6070 out_nowq:
6071         unregister_pernet_subsys(&addrconf_ops);
6072 out_addrlabel:
6073         ipv6_addr_label_cleanup();
6074 out:
6075         return err;
6076 }
6077
6078 void addrconf_cleanup(void)
6079 {
6080         struct net_device *dev;
6081         int i;
6082
6083         unregister_netdevice_notifier(&ipv6_dev_notf);
6084         unregister_pernet_subsys(&addrconf_ops);
6085         ipv6_addr_label_cleanup();
6086
6087         rtnl_lock();
6088
6089         __rtnl_af_unregister(&inet6_ops);
6090
6091         /* clean dev list */
6092         for_each_netdev(&init_net, dev) {
6093                 if (__in6_dev_get(dev) == NULL)
6094                         continue;
6095                 addrconf_ifdown(dev, 1);
6096         }
6097         addrconf_ifdown(init_net.loopback_dev, 2);
6098
6099         /*
6100          *      Check hash table.
6101          */
6102         spin_lock_bh(&addrconf_hash_lock);
6103         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6104                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6105         spin_unlock_bh(&addrconf_hash_lock);
6106         cancel_delayed_work(&addr_chk_work);
6107         rtnl_unlock();
6108
6109         destroy_workqueue(addrconf_wq);
6110 }