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/6lowpan.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
 153 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 154 static int ipv6_count_addresses(struct inet6_dev *idev);
 155 static int ipv6_generate_stable_address(struct in6_addr *addr,
 156                                         u8 dad_count,
 157                                         const struct inet6_dev *idev);
 158
 159 /*
 160  *      Configured unicast address hash table
 161  */
 162 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 163 static DEFINE_SPINLOCK(addrconf_hash_lock);
 164
 165 static void addrconf_verify(void);
 166 static void addrconf_verify_rtnl(void);
 167 static void addrconf_verify_work(struct work_struct *);
 168
 169 static struct workqueue_struct *addrconf_wq;
 170 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 171
 172 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 173 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 174
 175 static void addrconf_type_change(struct net_device *dev,
 176                                  unsigned long event);
 177 static int addrconf_ifdown(struct net_device *dev, int how);
 178
 179 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 180                                                   int plen,
 181                                                   const struct net_device *dev,
 182                                                   u32 flags, u32 noflags);
 183
 184 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 185 static void addrconf_dad_work(struct work_struct *w);
 186 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 187 static void addrconf_dad_run(struct inet6_dev *idev);
 188 static void addrconf_rs_timer(unsigned long data);
 189 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 190 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 191
 192 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 193                                 struct prefix_info *pinfo);
 194 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 195                                struct net_device *dev);
 196
 197 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 198         .forwarding             = 0,
 199         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 200         .mtu6                   = IPV6_MIN_MTU,
 201         .accept_ra              = 1,
 202         .accept_redirects       = 1,
 203         .autoconf               = 1,
 204         .force_mld_version      = 0,
 205         .mldv1_unsolicited_report_interval = 10 * HZ,
 206         .mldv2_unsolicited_report_interval = HZ,
 207         .dad_transmits          = 1,
 208         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 209         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 210         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 211         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 212         .use_tempaddr           = 0,
 213         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 214         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 215         .regen_max_retry        = REGEN_MAX_RETRY,
 216         .max_desync_factor      = MAX_DESYNC_FACTOR,
 217         .max_addresses          = IPV6_MAX_ADDRESSES,
 218         .accept_ra_defrtr       = 1,
 219         .accept_ra_from_local   = 0,
 220         .accept_ra_min_hop_limit= 1,
 221         .accept_ra_pinfo        = 1,
 222 #ifdef CONFIG_IPV6_ROUTER_PREF
 223         .accept_ra_rtr_pref     = 1,
 224         .rtr_probe_interval     = 60 * HZ,
 225 #ifdef CONFIG_IPV6_ROUTE_INFO
 226         .accept_ra_rt_info_max_plen = 0,
 227 #endif
 228 #endif
 229         .proxy_ndp              = 0,
 230         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 231         .disable_ipv6           = 0,
 232         .accept_dad             = 1,
 233         .suppress_frag_ndisc    = 1,
 234         .accept_ra_mtu          = 1,
 235         .stable_secret          = {
 236                 .initialized = false,
 237         },
 238         .use_oif_addrs_only     = 0,
 239         .ignore_routes_with_linkdown = 0,
 240         .keep_addr_on_down      = 0,
 241 };
 242
 243 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 244         .forwarding             = 0,
 245         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 246         .mtu6                   = IPV6_MIN_MTU,
 247         .accept_ra              = 1,
 248         .accept_redirects       = 1,
 249         .autoconf               = 1,
 250         .force_mld_version      = 0,
 251         .mldv1_unsolicited_report_interval = 10 * HZ,
 252         .mldv2_unsolicited_report_interval = HZ,
 253         .dad_transmits          = 1,
 254         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 255         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 256         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 257         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 258         .use_tempaddr           = 0,
 259         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 260         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 261         .regen_max_retry        = REGEN_MAX_RETRY,
 262         .max_desync_factor      = MAX_DESYNC_FACTOR,
 263         .max_addresses          = IPV6_MAX_ADDRESSES,
 264         .accept_ra_defrtr       = 1,
 265         .accept_ra_from_local   = 0,
 266         .accept_ra_min_hop_limit= 1,
 267         .accept_ra_pinfo        = 1,
 268 #ifdef CONFIG_IPV6_ROUTER_PREF
 269         .accept_ra_rtr_pref     = 1,
 270         .rtr_probe_interval     = 60 * HZ,
 271 #ifdef CONFIG_IPV6_ROUTE_INFO
 272         .accept_ra_rt_info_max_plen = 0,
 273 #endif
 274 #endif
 275         .proxy_ndp              = 0,
 276         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 277         .disable_ipv6           = 0,
 278         .accept_dad             = 1,
 279         .suppress_frag_ndisc    = 1,
 280         .accept_ra_mtu          = 1,
 281         .stable_secret          = {
 282                 .initialized = false,
 283         },
 284         .use_oif_addrs_only     = 0,
 285         .ignore_routes_with_linkdown = 0,
 286         .keep_addr_on_down      = 0,
 287 };
 288
 289 /* Check if a valid qdisc is available */
 290 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 291 {
 292         return !qdisc_tx_is_noop(dev);
 293 }
 294
 295 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 296 {
 297         if (del_timer(&idev->rs_timer))
 298                 __in6_dev_put(idev);
 299 }
 300
 301 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 302 {
 303         if (cancel_delayed_work(&ifp->dad_work))
 304                 __in6_ifa_put(ifp);
 305 }
 306
 307 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 308                                   unsigned long when)
 309 {
 310         if (!timer_pending(&idev->rs_timer))
 311                 in6_dev_hold(idev);
 312         mod_timer(&idev->rs_timer, jiffies + when);
 313 }
 314
 315 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 316                                    unsigned long delay)
 317 {
 318         if (!delayed_work_pending(&ifp->dad_work))
 319                 in6_ifa_hold(ifp);
 320         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 321 }
 322
 323 static int snmp6_alloc_dev(struct inet6_dev *idev)
 324 {
 325         int i;
 326
 327         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 328         if (!idev->stats.ipv6)
 329                 goto err_ip;
 330
 331         for_each_possible_cpu(i) {
 332                 struct ipstats_mib *addrconf_stats;
 333                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 334                 u64_stats_init(&addrconf_stats->syncp);
 335         }
 336
 337
 338         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 339                                         GFP_KERNEL);
 340         if (!idev->stats.icmpv6dev)
 341                 goto err_icmp;
 342         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 343                                            GFP_KERNEL);
 344         if (!idev->stats.icmpv6msgdev)
 345                 goto err_icmpmsg;
 346
 347         return 0;
 348
 349 err_icmpmsg:
 350         kfree(idev->stats.icmpv6dev);
 351 err_icmp:
 352         free_percpu(idev->stats.ipv6);
 353 err_ip:
 354         return -ENOMEM;
 355 }
 356
 357 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 358 {
 359         struct inet6_dev *ndev;
 360         int err = -ENOMEM;
 361
 362         ASSERT_RTNL();
 363
 364         if (dev->mtu < IPV6_MIN_MTU)
 365                 return ERR_PTR(-EINVAL);
 366
 367         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 368         if (!ndev)
 369                 return ERR_PTR(err);
 370
 371         rwlock_init(&ndev->lock);
 372         ndev->dev = dev;
 373         INIT_LIST_HEAD(&ndev->addr_list);
 374         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 375                     (unsigned long)ndev);
 376         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 377
 378         if (ndev->cnf.stable_secret.initialized)
 379                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 380         else
 381                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
 382
 383         ndev->cnf.mtu6 = dev->mtu;
 384         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 385         if (!ndev->nd_parms) {
 386                 kfree(ndev);
 387                 return ERR_PTR(err);
 388         }
 389         if (ndev->cnf.forwarding)
 390                 dev_disable_lro(dev);
 391         /* We refer to the device */
 392         dev_hold(dev);
 393
 394         if (snmp6_alloc_dev(ndev) < 0) {
 395                 ADBG(KERN_WARNING
 396                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 397                         __func__, dev->name);
 398                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 399                 dev_put(dev);
 400                 kfree(ndev);
 401                 return ERR_PTR(err);
 402         }
 403
 404         if (snmp6_register_dev(ndev) < 0) {
 405                 ADBG(KERN_WARNING
 406                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 407                         __func__, dev->name);
 408                 goto err_release;
 409         }
 410
 411         /* One reference from device. */
 412         in6_dev_hold(ndev);
 413
 414         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 415                 ndev->cnf.accept_dad = -1;
 416
 417 #if IS_ENABLED(CONFIG_IPV6_SIT)
 418         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 419                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 420                 ndev->cnf.rtr_solicits = 0;
 421         }
 422 #endif
 423
 424         INIT_LIST_HEAD(&ndev->tempaddr_list);
 425         ndev->desync_factor = U32_MAX;
 426         if ((dev->flags&IFF_LOOPBACK) ||
 427             dev->type == ARPHRD_TUNNEL ||
 428             dev->type == ARPHRD_TUNNEL6 ||
 429             dev->type == ARPHRD_SIT ||
 430             dev->type == ARPHRD_NONE) {
 431                 ndev->cnf.use_tempaddr = -1;
 432         } else
 433                 ipv6_regen_rndid(ndev);
 434
 435         ndev->token = in6addr_any;
 436
 437         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 438                 ndev->if_flags |= IF_READY;
 439
 440         ipv6_mc_init_dev(ndev);
 441         ndev->tstamp = jiffies;
 442         err = addrconf_sysctl_register(ndev);
 443         if (err) {
 444                 ipv6_mc_destroy_dev(ndev);
 445                 snmp6_unregister_dev(ndev);
 446                 goto err_release;
 447         }
 448         /* protected by rtnl_lock */
 449         rcu_assign_pointer(dev->ip6_ptr, ndev);
 450
 451         /* Join interface-local all-node multicast group */
 452         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 453
 454         /* Join all-node multicast group */
 455         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 456
 457         /* Join all-router multicast group if forwarding is set */
 458         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 459                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 460
 461         return ndev;
 462
 463 err_release:
 464         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 465         ndev->dead = 1;
 466         in6_dev_finish_destroy(ndev);
 467         return ERR_PTR(err);
 468 }
 469
 470 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 471 {
 472         struct inet6_dev *idev;
 473
 474         ASSERT_RTNL();
 475
 476         idev = __in6_dev_get(dev);
 477         if (!idev) {
 478                 idev = ipv6_add_dev(dev);
 479                 if (IS_ERR(idev))
 480                         return NULL;
 481         }
 482
 483         if (dev->flags&IFF_UP)
 484                 ipv6_mc_up(idev);
 485         return idev;
 486 }
 487
 488 static int inet6_netconf_msgsize_devconf(int type)
 489 {
 490         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 491                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 492         bool all = false;
 493
 494         if (type == NETCONFA_ALL)
 495                 all = true;
 496
 497         if (all || type == NETCONFA_FORWARDING)
 498                 size += nla_total_size(4);
 499 #ifdef CONFIG_IPV6_MROUTE
 500         if (all || type == NETCONFA_MC_FORWARDING)
 501                 size += nla_total_size(4);
 502 #endif
 503         if (all || type == NETCONFA_PROXY_NEIGH)
 504                 size += nla_total_size(4);
 505
 506         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 507                 size += nla_total_size(4);
 508
 509         return size;
 510 }
 511
 512 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 513                                       struct ipv6_devconf *devconf, u32 portid,
 514                                       u32 seq, int event, unsigned int flags,
 515                                       int type)
 516 {
 517         struct nlmsghdr  *nlh;
 518         struct netconfmsg *ncm;
 519         bool all = false;
 520
 521         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 522                         flags);
 523         if (!nlh)
 524                 return -EMSGSIZE;
 525
 526         if (type == NETCONFA_ALL)
 527                 all = true;
 528
 529         ncm = nlmsg_data(nlh);
 530         ncm->ncm_family = AF_INET6;
 531
 532         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 533                 goto nla_put_failure;
 534
 535         if ((all || type == NETCONFA_FORWARDING) &&
 536             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 537                 goto nla_put_failure;
 538 #ifdef CONFIG_IPV6_MROUTE
 539         if ((all || type == NETCONFA_MC_FORWARDING) &&
 540             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 541                         devconf->mc_forwarding) < 0)
 542                 goto nla_put_failure;
 543 #endif
 544         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 545             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 546                 goto nla_put_failure;
 547
 548         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 549             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 550                         devconf->ignore_routes_with_linkdown) < 0)
 551                 goto nla_put_failure;
 552
 553         nlmsg_end(skb, nlh);
 554         return 0;
 555
 556 nla_put_failure:
 557         nlmsg_cancel(skb, nlh);
 558         return -EMSGSIZE;
 559 }
 560
 561 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 562                                   struct ipv6_devconf *devconf)
 563 {
 564         struct sk_buff *skb;
 565         int err = -ENOBUFS;
 566
 567         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 568         if (!skb)
 569                 goto errout;
 570
 571         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 572                                          RTM_NEWNETCONF, 0, type);
 573         if (err < 0) {
 574                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 575                 WARN_ON(err == -EMSGSIZE);
 576                 kfree_skb(skb);
 577                 goto errout;
 578         }
 579         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 580         return;
 581 errout:
 582         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 583 }
 584
 585 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 586         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 587         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 588         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 589         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 590 };
 591
 592 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 593                                      struct nlmsghdr *nlh)
 594 {
 595         struct net *net = sock_net(in_skb->sk);
 596         struct nlattr *tb[NETCONFA_MAX+1];
 597         struct netconfmsg *ncm;
 598         struct sk_buff *skb;
 599         struct ipv6_devconf *devconf;
 600         struct inet6_dev *in6_dev;
 601         struct net_device *dev;
 602         int ifindex;
 603         int err;
 604
 605         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 606                           devconf_ipv6_policy);
 607         if (err < 0)
 608                 goto errout;
 609
 610         err = -EINVAL;
 611         if (!tb[NETCONFA_IFINDEX])
 612                 goto errout;
 613
 614         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 615         switch (ifindex) {
 616         case NETCONFA_IFINDEX_ALL:
 617                 devconf = net->ipv6.devconf_all;
 618                 break;
 619         case NETCONFA_IFINDEX_DEFAULT:
 620                 devconf = net->ipv6.devconf_dflt;
 621                 break;
 622         default:
 623                 dev = __dev_get_by_index(net, ifindex);
 624                 if (!dev)
 625                         goto errout;
 626                 in6_dev = __in6_dev_get(dev);
 627                 if (!in6_dev)
 628                         goto errout;
 629                 devconf = &in6_dev->cnf;
 630                 break;
 631         }
 632
 633         err = -ENOBUFS;
 634         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
 635         if (!skb)
 636                 goto errout;
 637
 638         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 639                                          NETLINK_CB(in_skb).portid,
 640                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 641                                          NETCONFA_ALL);
 642         if (err < 0) {
 643                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 644                 WARN_ON(err == -EMSGSIZE);
 645                 kfree_skb(skb);
 646                 goto errout;
 647         }
 648         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 649 errout:
 650         return err;
 651 }
 652
 653 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 654                                       struct netlink_callback *cb)
 655 {
 656         struct net *net = sock_net(skb->sk);
 657         int h, s_h;
 658         int idx, s_idx;
 659         struct net_device *dev;
 660         struct inet6_dev *idev;
 661         struct hlist_head *head;
 662
 663         s_h = cb->args[0];
 664         s_idx = idx = cb->args[1];
 665
 666         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 667                 idx = 0;
 668                 head = &net->dev_index_head[h];
 669                 rcu_read_lock();
 670                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 671                           net->dev_base_seq;
 672                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 673                         if (idx < s_idx)
 674                                 goto cont;
 675                         idev = __in6_dev_get(dev);
 676                         if (!idev)
 677                                 goto cont;
 678
 679                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 680                                                        &idev->cnf,
 681                                                        NETLINK_CB(cb->skb).portid,
 682                                                        cb->nlh->nlmsg_seq,
 683                                                        RTM_NEWNETCONF,
 684                                                        NLM_F_MULTI,
 685                                                        NETCONFA_ALL) < 0) {
 686                                 rcu_read_unlock();
 687                                 goto done;
 688                         }
 689                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 690 cont:
 691                         idx++;
 692                 }
 693                 rcu_read_unlock();
 694         }
 695         if (h == NETDEV_HASHENTRIES) {
 696                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 697                                                net->ipv6.devconf_all,
 698                                                NETLINK_CB(cb->skb).portid,
 699                                                cb->nlh->nlmsg_seq,
 700                                                RTM_NEWNETCONF, NLM_F_MULTI,
 701                                                NETCONFA_ALL) < 0)
 702                         goto done;
 703                 else
 704                         h++;
 705         }
 706         if (h == NETDEV_HASHENTRIES + 1) {
 707                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 708                                                net->ipv6.devconf_dflt,
 709                                                NETLINK_CB(cb->skb).portid,
 710                                                cb->nlh->nlmsg_seq,
 711                                                RTM_NEWNETCONF, NLM_F_MULTI,
 712                                                NETCONFA_ALL) < 0)
 713                         goto done;
 714                 else
 715                         h++;
 716         }
 717 done:
 718         cb->args[0] = h;
 719         cb->args[1] = idx;
 720
 721         return skb->len;
 722 }
 723
 724 #ifdef CONFIG_SYSCTL
 725 static void dev_forward_change(struct inet6_dev *idev)
 726 {
 727         struct net_device *dev;
 728         struct inet6_ifaddr *ifa;
 729
 730         if (!idev)
 731                 return;
 732         dev = idev->dev;
 733         if (idev->cnf.forwarding)
 734                 dev_disable_lro(dev);
 735         if (dev->flags & IFF_MULTICAST) {
 736                 if (idev->cnf.forwarding) {
 737                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 738                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 739                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 740                 } else {
 741                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 742                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 743                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 744                 }
 745         }
 746
 747         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 748                 if (ifa->flags&IFA_F_TENTATIVE)
 749                         continue;
 750                 if (idev->cnf.forwarding)
 751                         addrconf_join_anycast(ifa);
 752                 else
 753                         addrconf_leave_anycast(ifa);
 754         }
 755         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 756                                      dev->ifindex, &idev->cnf);
 757 }
 758
 759
 760 static void addrconf_forward_change(struct net *net, __s32 newf)
 761 {
 762         struct net_device *dev;
 763         struct inet6_dev *idev;
 764
 765         for_each_netdev(net, dev) {
 766                 idev = __in6_dev_get(dev);
 767                 if (idev) {
 768                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 769                         idev->cnf.forwarding = newf;
 770                         if (changed)
 771                                 dev_forward_change(idev);
 772                 }
 773         }
 774 }
 775
 776 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 777 {
 778         struct net *net;
 779         int old;
 780
 781         if (!rtnl_trylock())
 782                 return restart_syscall();
 783
 784         net = (struct net *)table->extra2;
 785         old = *p;
 786         *p = newf;
 787
 788         if (p == &net->ipv6.devconf_dflt->forwarding) {
 789                 if ((!newf) ^ (!old))
 790                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 791                                                      NETCONFA_IFINDEX_DEFAULT,
 792                                                      net->ipv6.devconf_dflt);
 793                 rtnl_unlock();
 794                 return 0;
 795         }
 796
 797         if (p == &net->ipv6.devconf_all->forwarding) {
 798                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 799
 800                 net->ipv6.devconf_dflt->forwarding = newf;
 801                 if ((!newf) ^ (!old_dflt))
 802                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 803                                                      NETCONFA_IFINDEX_DEFAULT,
 804                                                      net->ipv6.devconf_dflt);
 805
 806                 addrconf_forward_change(net, newf);
 807                 if ((!newf) ^ (!old))
 808                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 809                                                      NETCONFA_IFINDEX_ALL,
 810                                                      net->ipv6.devconf_all);
 811         } else if ((!newf) ^ (!old))
 812                 dev_forward_change((struct inet6_dev *)table->extra1);
 813         rtnl_unlock();
 814
 815         if (newf)
 816                 rt6_purge_dflt_routers(net);
 817         return 1;
 818 }
 819
 820 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 821 {
 822         struct net_device *dev;
 823         struct inet6_dev *idev;
 824
 825         for_each_netdev(net, dev) {
 826                 idev = __in6_dev_get(dev);
 827                 if (idev) {
 828                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 829
 830                         idev->cnf.ignore_routes_with_linkdown = newf;
 831                         if (changed)
 832                                 inet6_netconf_notify_devconf(dev_net(dev),
 833                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 834                                                              dev->ifindex,
 835                                                              &idev->cnf);
 836                 }
 837         }
 838 }
 839
 840 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 841 {
 842         struct net *net;
 843         int old;
 844
 845         if (!rtnl_trylock())
 846                 return restart_syscall();
 847
 848         net = (struct net *)table->extra2;
 849         old = *p;
 850         *p = newf;
 851
 852         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 853                 if ((!newf) ^ (!old))
 854                         inet6_netconf_notify_devconf(net,
 855                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 856                                                      NETCONFA_IFINDEX_DEFAULT,
 857                                                      net->ipv6.devconf_dflt);
 858                 rtnl_unlock();
 859                 return 0;
 860         }
 861
 862         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 863                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 864                 addrconf_linkdown_change(net, newf);
 865                 if ((!newf) ^ (!old))
 866                         inet6_netconf_notify_devconf(net,
 867                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 868                                                      NETCONFA_IFINDEX_ALL,
 869                                                      net->ipv6.devconf_all);
 870         }
 871         rtnl_unlock();
 872
 873         return 1;
 874 }
 875
 876 #endif
 877
 878 /* Nobody refers to this ifaddr, destroy it */
 879 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 880 {
 881         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 882
 883 #ifdef NET_REFCNT_DEBUG
 884         pr_debug("%s\n", __func__);
 885 #endif
 886
 887         in6_dev_put(ifp->idev);
 888
 889         if (cancel_delayed_work(&ifp->dad_work))
 890                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 891                           ifp);
 892
 893         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 894                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 895                 return;
 896         }
 897         ip6_rt_put(ifp->rt);
 898
 899         kfree_rcu(ifp, rcu);
 900 }
 901
 902 static void
 903 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 904 {
 905         struct list_head *p;
 906         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 907
 908         /*
 909          * Each device address list is sorted in order of scope -
 910          * global before linklocal.
 911          */
 912         list_for_each(p, &idev->addr_list) {
 913                 struct inet6_ifaddr *ifa
 914                         = list_entry(p, struct inet6_ifaddr, if_list);
 915                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 916                         break;
 917         }
 918
 919         list_add_tail(&ifp->if_list, p);
 920 }
 921
 922 static u32 inet6_addr_hash(const struct in6_addr *addr)
 923 {
 924         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 925 }
 926
 927 /* On success it returns ifp with increased reference count */
 928
 929 static struct inet6_ifaddr *
 930 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 931               const struct in6_addr *peer_addr, int pfxlen,
 932               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 933 {
 934         struct inet6_ifaddr *ifa = NULL;
 935         struct rt6_info *rt;
 936         unsigned int hash;
 937         int err = 0;
 938         int addr_type = ipv6_addr_type(addr);
 939
 940         if (addr_type == IPV6_ADDR_ANY ||
 941             addr_type & IPV6_ADDR_MULTICAST ||
 942             (!(idev->dev->flags & IFF_LOOPBACK) &&
 943              addr_type & IPV6_ADDR_LOOPBACK))
 944                 return ERR_PTR(-EADDRNOTAVAIL);
 945
 946         rcu_read_lock_bh();
 947         if (idev->dead) {
 948                 err = -ENODEV;                  /*XXX*/
 949                 goto out2;
 950         }
 951
 952         if (idev->cnf.disable_ipv6) {
 953                 err = -EACCES;
 954                 goto out2;
 955         }
 956
 957         spin_lock(&addrconf_hash_lock);
 958
 959         /* Ignore adding duplicate addresses on an interface */
 960         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 961                 ADBG("ipv6_add_addr: already assigned\n");
 962                 err = -EEXIST;
 963                 goto out;
 964         }
 965
 966         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 967
 968         if (!ifa) {
 969                 ADBG("ipv6_add_addr: malloc failed\n");
 970                 err = -ENOBUFS;
 971                 goto out;
 972         }
 973
 974         rt = addrconf_dst_alloc(idev, addr, false);
 975         if (IS_ERR(rt)) {
 976                 err = PTR_ERR(rt);
 977                 goto out;
 978         }
 979
 980         neigh_parms_data_state_setall(idev->nd_parms);
 981
 982         ifa->addr = *addr;
 983         if (peer_addr)
 984                 ifa->peer_addr = *peer_addr;
 985
 986         spin_lock_init(&ifa->lock);
 987         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 988         INIT_HLIST_NODE(&ifa->addr_lst);
 989         ifa->scope = scope;
 990         ifa->prefix_len = pfxlen;
 991         ifa->flags = flags | IFA_F_TENTATIVE;
 992         ifa->valid_lft = valid_lft;
 993         ifa->prefered_lft = prefered_lft;
 994         ifa->cstamp = ifa->tstamp = jiffies;
 995         ifa->tokenized = false;
 996
 997         ifa->rt = rt;
 998
 999         ifa->idev = idev;
1000         in6_dev_hold(idev);
1001         /* For caller */
1002         in6_ifa_hold(ifa);
1003
1004         /* Add to big hash table */
1005         hash = inet6_addr_hash(addr);
1006
1007         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1008         spin_unlock(&addrconf_hash_lock);
1009
1010         write_lock(&idev->lock);
1011         /* Add to inet6_dev unicast addr list. */
1012         ipv6_link_dev_addr(idev, ifa);
1013
1014         if (ifa->flags&IFA_F_TEMPORARY) {
1015                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1016                 in6_ifa_hold(ifa);
1017         }
1018
1019         in6_ifa_hold(ifa);
1020         write_unlock(&idev->lock);
1021 out2:
1022         rcu_read_unlock_bh();
1023
1024         if (likely(err == 0))
1025                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1026         else {
1027                 kfree(ifa);
1028                 ifa = ERR_PTR(err);
1029         }
1030
1031         return ifa;
1032 out:
1033         spin_unlock(&addrconf_hash_lock);
1034         goto out2;
1035 }
1036
1037 enum cleanup_prefix_rt_t {
1038         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1039         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1040         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1041 };
1042
1043 /*
1044  * Check, whether the prefix for ifp would still need a prefix route
1045  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1046  * constants.
1047  *
1048  * 1) we don't purge prefix if address was not permanent.
1049  *    prefix is managed by its own lifetime.
1050  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1051  * 3) if there are no addresses, delete prefix.
1052  * 4) if there are still other permanent address(es),
1053  *    corresponding prefix is still permanent.
1054  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1055  *    don't purge the prefix, assume user space is managing it.
1056  * 6) otherwise, update prefix lifetime to the
1057  *    longest valid lifetime among the corresponding
1058  *    addresses on the device.
1059  *    Note: subsequent RA will update lifetime.
1060  **/
1061 static enum cleanup_prefix_rt_t
1062 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1063 {
1064         struct inet6_ifaddr *ifa;
1065         struct inet6_dev *idev = ifp->idev;
1066         unsigned long lifetime;
1067         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1068
1069         *expires = jiffies;
1070
1071         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1072                 if (ifa == ifp)
1073                         continue;
1074                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1075                                        ifp->prefix_len))
1076                         continue;
1077                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1078                         return CLEANUP_PREFIX_RT_NOP;
1079
1080                 action = CLEANUP_PREFIX_RT_EXPIRE;
1081
1082                 spin_lock(&ifa->lock);
1083
1084                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1085                 /*
1086                  * Note: Because this address is
1087                  * not permanent, lifetime <
1088                  * LONG_MAX / HZ here.
1089                  */
1090                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1091                         *expires = ifa->tstamp + lifetime * HZ;
1092                 spin_unlock(&ifa->lock);
1093         }
1094
1095         return action;
1096 }
1097
1098 static void
1099 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1100 {
1101         struct rt6_info *rt;
1102
1103         rt = addrconf_get_prefix_route(&ifp->addr,
1104                                        ifp->prefix_len,
1105                                        ifp->idev->dev,
1106                                        0, RTF_GATEWAY | RTF_DEFAULT);
1107         if (rt) {
1108                 if (del_rt)
1109                         ip6_del_rt(rt);
1110                 else {
1111                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1112                                 rt6_set_expires(rt, expires);
1113                         ip6_rt_put(rt);
1114                 }
1115         }
1116 }
1117
1118
1119 /* This function wants to get referenced ifp and releases it before return */
1120
1121 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1122 {
1123         int state;
1124         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1125         unsigned long expires;
1126
1127         ASSERT_RTNL();
1128
1129         spin_lock_bh(&ifp->lock);
1130         state = ifp->state;
1131         ifp->state = INET6_IFADDR_STATE_DEAD;
1132         spin_unlock_bh(&ifp->lock);
1133
1134         if (state == INET6_IFADDR_STATE_DEAD)
1135                 goto out;
1136
1137         spin_lock_bh(&addrconf_hash_lock);
1138         hlist_del_init_rcu(&ifp->addr_lst);
1139         spin_unlock_bh(&addrconf_hash_lock);
1140
1141         write_lock_bh(&ifp->idev->lock);
1142
1143         if (ifp->flags&IFA_F_TEMPORARY) {
1144                 list_del(&ifp->tmp_list);
1145                 if (ifp->ifpub) {
1146                         in6_ifa_put(ifp->ifpub);
1147                         ifp->ifpub = NULL;
1148                 }
1149                 __in6_ifa_put(ifp);
1150         }
1151
1152         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1153                 action = check_cleanup_prefix_route(ifp, &expires);
1154
1155         list_del_init(&ifp->if_list);
1156         __in6_ifa_put(ifp);
1157
1158         write_unlock_bh(&ifp->idev->lock);
1159
1160         addrconf_del_dad_work(ifp);
1161
1162         ipv6_ifa_notify(RTM_DELADDR, ifp);
1163
1164         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1165
1166         if (action != CLEANUP_PREFIX_RT_NOP) {
1167                 cleanup_prefix_route(ifp, expires,
1168                         action == CLEANUP_PREFIX_RT_DEL);
1169         }
1170
1171         /* clean up prefsrc entries */
1172         rt6_remove_prefsrc(ifp);
1173 out:
1174         in6_ifa_put(ifp);
1175 }
1176
1177 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1178 {
1179         struct inet6_dev *idev = ifp->idev;
1180         struct in6_addr addr, *tmpaddr;
1181         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1182         unsigned long regen_advance;
1183         int tmp_plen;
1184         int ret = 0;
1185         u32 addr_flags;
1186         unsigned long now = jiffies;
1187         long max_desync_factor;
1188         s32 cnf_temp_preferred_lft;
1189
1190         write_lock_bh(&idev->lock);
1191         if (ift) {
1192                 spin_lock_bh(&ift->lock);
1193                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1194                 spin_unlock_bh(&ift->lock);
1195                 tmpaddr = &addr;
1196         } else {
1197                 tmpaddr = NULL;
1198         }
1199 retry:
1200         in6_dev_hold(idev);
1201         if (idev->cnf.use_tempaddr <= 0) {
1202                 write_unlock_bh(&idev->lock);
1203                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1204                 in6_dev_put(idev);
1205                 ret = -1;
1206                 goto out;
1207         }
1208         spin_lock_bh(&ifp->lock);
1209         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1210                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1211                 spin_unlock_bh(&ifp->lock);
1212                 write_unlock_bh(&idev->lock);
1213                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1214                         __func__);
1215                 in6_dev_put(idev);
1216                 ret = -1;
1217                 goto out;
1218         }
1219         in6_ifa_hold(ifp);
1220         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1221         ipv6_try_regen_rndid(idev, tmpaddr);
1222         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1223         age = (now - ifp->tstamp) / HZ;
1224
1225         regen_advance = idev->cnf.regen_max_retry *
1226                         idev->cnf.dad_transmits *
1227                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1228
1229         /* recalculate max_desync_factor each time and update
1230          * idev->desync_factor if it's larger
1231          */
1232         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1233         max_desync_factor = min_t(__u32,
1234                                   idev->cnf.max_desync_factor,
1235                                   cnf_temp_preferred_lft - regen_advance);
1236
1237         if (unlikely(idev->desync_factor > max_desync_factor)) {
1238                 if (max_desync_factor > 0) {
1239                         get_random_bytes(&idev->desync_factor,
1240                                          sizeof(idev->desync_factor));
1241                         idev->desync_factor %= max_desync_factor;
1242                 } else {
1243                         idev->desync_factor = 0;
1244                 }
1245         }
1246
1247         tmp_valid_lft = min_t(__u32,
1248                               ifp->valid_lft,
1249                               idev->cnf.temp_valid_lft + age);
1250         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1251                             idev->desync_factor;
1252         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1253         tmp_plen = ifp->prefix_len;
1254         tmp_tstamp = ifp->tstamp;
1255         spin_unlock_bh(&ifp->lock);
1256
1257         write_unlock_bh(&idev->lock);
1258
1259         /* A temporary address is created only if this calculated Preferred
1260          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1261          * an implementation must not create a temporary address with a zero
1262          * Preferred Lifetime.
1263          * Use age calculation as in addrconf_verify to avoid unnecessary
1264          * temporary addresses being generated.
1265          */
1266         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1267         if (tmp_prefered_lft <= regen_advance + age) {
1268                 in6_ifa_put(ifp);
1269                 in6_dev_put(idev);
1270                 ret = -1;
1271                 goto out;
1272         }
1273
1274         addr_flags = IFA_F_TEMPORARY;
1275         /* set in addrconf_prefix_rcv() */
1276         if (ifp->flags & IFA_F_OPTIMISTIC)
1277                 addr_flags |= IFA_F_OPTIMISTIC;
1278
1279         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1280                             ipv6_addr_scope(&addr), addr_flags,
1281                             tmp_valid_lft, tmp_prefered_lft);
1282         if (IS_ERR(ift)) {
1283                 in6_ifa_put(ifp);
1284                 in6_dev_put(idev);
1285                 pr_info("%s: retry temporary address regeneration\n", __func__);
1286                 tmpaddr = &addr;
1287                 write_lock_bh(&idev->lock);
1288                 goto retry;
1289         }
1290
1291         spin_lock_bh(&ift->lock);
1292         ift->ifpub = ifp;
1293         ift->cstamp = now;
1294         ift->tstamp = tmp_tstamp;
1295         spin_unlock_bh(&ift->lock);
1296
1297         addrconf_dad_start(ift);
1298         in6_ifa_put(ift);
1299         in6_dev_put(idev);
1300 out:
1301         return ret;
1302 }
1303
1304 /*
1305  *      Choose an appropriate source address (RFC3484)
1306  */
1307 enum {
1308         IPV6_SADDR_RULE_INIT = 0,
1309         IPV6_SADDR_RULE_LOCAL,
1310         IPV6_SADDR_RULE_SCOPE,
1311         IPV6_SADDR_RULE_PREFERRED,
1312 #ifdef CONFIG_IPV6_MIP6
1313         IPV6_SADDR_RULE_HOA,
1314 #endif
1315         IPV6_SADDR_RULE_OIF,
1316         IPV6_SADDR_RULE_LABEL,
1317         IPV6_SADDR_RULE_PRIVACY,
1318         IPV6_SADDR_RULE_ORCHID,
1319         IPV6_SADDR_RULE_PREFIX,
1320 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1321         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1322 #endif
1323         IPV6_SADDR_RULE_MAX
1324 };
1325
1326 struct ipv6_saddr_score {
1327         int                     rule;
1328         int                     addr_type;
1329         struct inet6_ifaddr     *ifa;
1330         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1331         int                     scopedist;
1332         int                     matchlen;
1333 };
1334
1335 struct ipv6_saddr_dst {
1336         const struct in6_addr *addr;
1337         int ifindex;
1338         int scope;
1339         int label;
1340         unsigned int prefs;
1341 };
1342
1343 static inline int ipv6_saddr_preferred(int type)
1344 {
1345         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1346                 return 1;
1347         return 0;
1348 }
1349
1350 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1351 {
1352 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1353         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1354 #else
1355         return false;
1356 #endif
1357 }
1358
1359 static int ipv6_get_saddr_eval(struct net *net,
1360                                struct ipv6_saddr_score *score,
1361                                struct ipv6_saddr_dst *dst,
1362                                int i)
1363 {
1364         int ret;
1365
1366         if (i <= score->rule) {
1367                 switch (i) {
1368                 case IPV6_SADDR_RULE_SCOPE:
1369                         ret = score->scopedist;
1370                         break;
1371                 case IPV6_SADDR_RULE_PREFIX:
1372                         ret = score->matchlen;
1373                         break;
1374                 default:
1375                         ret = !!test_bit(i, score->scorebits);
1376                 }
1377                 goto out;
1378         }
1379
1380         switch (i) {
1381         case IPV6_SADDR_RULE_INIT:
1382                 /* Rule 0: remember if hiscore is not ready yet */
1383                 ret = !!score->ifa;
1384                 break;
1385         case IPV6_SADDR_RULE_LOCAL:
1386                 /* Rule 1: Prefer same address */
1387                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1388                 break;
1389         case IPV6_SADDR_RULE_SCOPE:
1390                 /* Rule 2: Prefer appropriate scope
1391                  *
1392                  *      ret
1393                  *       ^
1394                  *    -1 |  d 15
1395                  *    ---+--+-+---> scope
1396                  *       |
1397                  *       |             d is scope of the destination.
1398                  *  B-d  |  \
1399                  *       |   \      <- smaller scope is better if
1400                  *  B-15 |    \        if scope is enough for destination.
1401                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1402                  * d-C-1 | /
1403                  *       |/         <- greater is better
1404                  *   -C  /             if scope is not enough for destination.
1405                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1406                  *
1407                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1408                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1409                  * Assume B = 0 and we get C > 29.
1410                  */
1411                 ret = __ipv6_addr_src_scope(score->addr_type);
1412                 if (ret >= dst->scope)
1413                         ret = -ret;
1414                 else
1415                         ret -= 128;     /* 30 is enough */
1416                 score->scopedist = ret;
1417                 break;
1418         case IPV6_SADDR_RULE_PREFERRED:
1419             {
1420                 /* Rule 3: Avoid deprecated and optimistic addresses */
1421                 u8 avoid = IFA_F_DEPRECATED;
1422
1423                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1424                         avoid |= IFA_F_OPTIMISTIC;
1425                 ret = ipv6_saddr_preferred(score->addr_type) ||
1426                       !(score->ifa->flags & avoid);
1427                 break;
1428             }
1429 #ifdef CONFIG_IPV6_MIP6
1430         case IPV6_SADDR_RULE_HOA:
1431             {
1432                 /* Rule 4: Prefer home address */
1433                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1434                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1435                 break;
1436             }
1437 #endif
1438         case IPV6_SADDR_RULE_OIF:
1439                 /* Rule 5: Prefer outgoing interface */
1440                 ret = (!dst->ifindex ||
1441                        dst->ifindex == score->ifa->idev->dev->ifindex);
1442                 break;
1443         case IPV6_SADDR_RULE_LABEL:
1444                 /* Rule 6: Prefer matching label */
1445                 ret = ipv6_addr_label(net,
1446                                       &score->ifa->addr, score->addr_type,
1447                                       score->ifa->idev->dev->ifindex) == dst->label;
1448                 break;
1449         case IPV6_SADDR_RULE_PRIVACY:
1450             {
1451                 /* Rule 7: Prefer public address
1452                  * Note: prefer temporary address if use_tempaddr >= 2
1453                  */
1454                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1455                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1456                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1457                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1458                 break;
1459             }
1460         case IPV6_SADDR_RULE_ORCHID:
1461                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1462                  *          non-ORCHID vs non-ORCHID
1463                  */
1464                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1465                         ipv6_addr_orchid(dst->addr));
1466                 break;
1467         case IPV6_SADDR_RULE_PREFIX:
1468                 /* Rule 8: Use longest matching prefix */
1469                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1470                 if (ret > score->ifa->prefix_len)
1471                         ret = score->ifa->prefix_len;
1472                 score->matchlen = ret;
1473                 break;
1474 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1475         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1476                 /* Optimistic addresses still have lower precedence than other
1477                  * preferred addresses.
1478                  */
1479                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1480                 break;
1481 #endif
1482         default:
1483                 ret = 0;
1484         }
1485
1486         if (ret)
1487                 __set_bit(i, score->scorebits);
1488         score->rule = i;
1489 out:
1490         return ret;
1491 }
1492
1493 static int __ipv6_dev_get_saddr(struct net *net,
1494                                 struct ipv6_saddr_dst *dst,
1495                                 struct inet6_dev *idev,
1496                                 struct ipv6_saddr_score *scores,
1497                                 int hiscore_idx)
1498 {
1499         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1500
1501         read_lock_bh(&idev->lock);
1502         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1503                 int i;
1504
1505                 /*
1506                  * - Tentative Address (RFC2462 section 5.4)
1507                  *  - A tentative address is not considered
1508                  *    "assigned to an interface" in the traditional
1509                  *    sense, unless it is also flagged as optimistic.
1510                  * - Candidate Source Address (section 4)
1511                  *  - In any case, anycast addresses, multicast
1512                  *    addresses, and the unspecified address MUST
1513                  *    NOT be included in a candidate set.
1514                  */
1515                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1516                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1517                         continue;
1518
1519                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1520
1521                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1522                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1523                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1524                                             idev->dev->name);
1525                         continue;
1526                 }
1527
1528                 score->rule = -1;
1529                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1530
1531                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1532                         int minihiscore, miniscore;
1533
1534                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1535                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1536
1537                         if (minihiscore > miniscore) {
1538                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1539                                     score->scopedist > 0) {
1540                                         /*
1541                                          * special case:
1542                                          * each remaining entry
1543                                          * has too small (not enough)
1544                                          * scope, because ifa entries
1545                                          * are sorted by their scope
1546                                          * values.
1547                                          */
1548                                         goto out;
1549                                 }
1550                                 break;
1551                         } else if (minihiscore < miniscore) {
1552                                 if (hiscore->ifa)
1553                                         in6_ifa_put(hiscore->ifa);
1554
1555                                 in6_ifa_hold(score->ifa);
1556
1557                                 swap(hiscore, score);
1558                                 hiscore_idx = 1 - hiscore_idx;
1559
1560                                 /* restore our iterator */
1561                                 score->ifa = hiscore->ifa;
1562
1563                                 break;
1564                         }
1565                 }
1566         }
1567 out:
1568         read_unlock_bh(&idev->lock);
1569         return hiscore_idx;
1570 }
1571
1572 static int ipv6_get_saddr_master(struct net *net,
1573                                  const struct net_device *dst_dev,
1574                                  const struct net_device *master,
1575                                  struct ipv6_saddr_dst *dst,
1576                                  struct ipv6_saddr_score *scores,
1577                                  int hiscore_idx)
1578 {
1579         struct inet6_dev *idev;
1580
1581         idev = __in6_dev_get(dst_dev);
1582         if (idev)
1583                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1584                                                    scores, hiscore_idx);
1585
1586         idev = __in6_dev_get(master);
1587         if (idev)
1588                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1589                                                    scores, hiscore_idx);
1590
1591         return hiscore_idx;
1592 }
1593
1594 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1595                        const struct in6_addr *daddr, unsigned int prefs,
1596                        struct in6_addr *saddr)
1597 {
1598         struct ipv6_saddr_score scores[2], *hiscore;
1599         struct ipv6_saddr_dst dst;
1600         struct inet6_dev *idev;
1601         struct net_device *dev;
1602         int dst_type;
1603         bool use_oif_addr = false;
1604         int hiscore_idx = 0;
1605
1606         dst_type = __ipv6_addr_type(daddr);
1607         dst.addr = daddr;
1608         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1609         dst.scope = __ipv6_addr_src_scope(dst_type);
1610         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1611         dst.prefs = prefs;
1612
1613         scores[hiscore_idx].rule = -1;
1614         scores[hiscore_idx].ifa = NULL;
1615
1616         rcu_read_lock();
1617
1618         /* Candidate Source Address (section 4)
1619          *  - multicast and link-local destination address,
1620          *    the set of candidate source address MUST only
1621          *    include addresses assigned to interfaces
1622          *    belonging to the same link as the outgoing
1623          *    interface.
1624          * (- For site-local destination addresses, the
1625          *    set of candidate source addresses MUST only
1626          *    include addresses assigned to interfaces
1627          *    belonging to the same site as the outgoing
1628          *    interface.)
1629          *  - "It is RECOMMENDED that the candidate source addresses
1630          *    be the set of unicast addresses assigned to the
1631          *    interface that will be used to send to the destination
1632          *    (the 'outgoing' interface)." (RFC 6724)
1633          */
1634         if (dst_dev) {
1635                 idev = __in6_dev_get(dst_dev);
1636                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1637                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1638                     (idev && idev->cnf.use_oif_addrs_only)) {
1639                         use_oif_addr = true;
1640                 }
1641         }
1642
1643         if (use_oif_addr) {
1644                 if (idev)
1645                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1646         } else {
1647                 const struct net_device *master;
1648                 int master_idx = 0;
1649
1650                 /* if dst_dev exists and is enslaved to an L3 device, then
1651                  * prefer addresses from dst_dev and then the master over
1652                  * any other enslaved devices in the L3 domain.
1653                  */
1654                 master = l3mdev_master_dev_rcu(dst_dev);
1655                 if (master) {
1656                         master_idx = master->ifindex;
1657
1658                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1659                                                             master, &dst,
1660                                                             scores, hiscore_idx);
1661
1662                         if (scores[hiscore_idx].ifa)
1663                                 goto out;
1664                 }
1665
1666                 for_each_netdev_rcu(net, dev) {
1667                         /* only consider addresses on devices in the
1668                          * same L3 domain
1669                          */
1670                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1671                                 continue;
1672                         idev = __in6_dev_get(dev);
1673                         if (!idev)
1674                                 continue;
1675                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1676                 }
1677         }
1678
1679 out:
1680         rcu_read_unlock();
1681
1682         hiscore = &scores[hiscore_idx];
1683         if (!hiscore->ifa)
1684                 return -EADDRNOTAVAIL;
1685
1686         *saddr = hiscore->ifa->addr;
1687         in6_ifa_put(hiscore->ifa);
1688         return 0;
1689 }
1690 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1691
1692 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1693                       u32 banned_flags)
1694 {
1695         struct inet6_ifaddr *ifp;
1696         int err = -EADDRNOTAVAIL;
1697
1698         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1699                 if (ifp->scope > IFA_LINK)
1700                         break;
1701                 if (ifp->scope == IFA_LINK &&
1702                     !(ifp->flags & banned_flags)) {
1703                         *addr = ifp->addr;
1704                         err = 0;
1705                         break;
1706                 }
1707         }
1708         return err;
1709 }
1710
1711 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1712                     u32 banned_flags)
1713 {
1714         struct inet6_dev *idev;
1715         int err = -EADDRNOTAVAIL;
1716
1717         rcu_read_lock();
1718         idev = __in6_dev_get(dev);
1719         if (idev) {
1720                 read_lock_bh(&idev->lock);
1721                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1722                 read_unlock_bh(&idev->lock);
1723         }
1724         rcu_read_unlock();
1725         return err;
1726 }
1727
1728 static int ipv6_count_addresses(struct inet6_dev *idev)
1729 {
1730         int cnt = 0;
1731         struct inet6_ifaddr *ifp;
1732
1733         read_lock_bh(&idev->lock);
1734         list_for_each_entry(ifp, &idev->addr_list, if_list)
1735                 cnt++;
1736         read_unlock_bh(&idev->lock);
1737         return cnt;
1738 }
1739
1740 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1741                   const struct net_device *dev, int strict)
1742 {
1743         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1744 }
1745 EXPORT_SYMBOL(ipv6_chk_addr);
1746
1747 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1748                             const struct net_device *dev, int strict,
1749                             u32 banned_flags)
1750 {
1751         struct inet6_ifaddr *ifp;
1752         unsigned int hash = inet6_addr_hash(addr);
1753         u32 ifp_flags;
1754
1755         rcu_read_lock_bh();
1756         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1757                 if (!net_eq(dev_net(ifp->idev->dev), net))
1758                         continue;
1759                 /* Decouple optimistic from tentative for evaluation here.
1760                  * Ban optimistic addresses explicitly, when required.
1761                  */
1762                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1763                             ? (ifp->flags&~IFA_F_TENTATIVE)
1764                             : ifp->flags;
1765                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1766                     !(ifp_flags&banned_flags) &&
1767                     (!dev || ifp->idev->dev == dev ||
1768                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1769                         rcu_read_unlock_bh();
1770                         return 1;
1771                 }
1772         }
1773
1774         rcu_read_unlock_bh();
1775         return 0;
1776 }
1777 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1778
1779 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1780                                struct net_device *dev)
1781 {
1782         unsigned int hash = inet6_addr_hash(addr);
1783         struct inet6_ifaddr *ifp;
1784
1785         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1786                 if (!net_eq(dev_net(ifp->idev->dev), net))
1787                         continue;
1788                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1789                         if (!dev || ifp->idev->dev == dev)
1790                                 return true;
1791                 }
1792         }
1793         return false;
1794 }
1795
1796 /* Compares an address/prefix_len with addresses on device @dev.
1797  * If one is found it returns true.
1798  */
1799 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1800         const unsigned int prefix_len, struct net_device *dev)
1801 {
1802         struct inet6_dev *idev;
1803         struct inet6_ifaddr *ifa;
1804         bool ret = false;
1805
1806         rcu_read_lock();
1807         idev = __in6_dev_get(dev);
1808         if (idev) {
1809                 read_lock_bh(&idev->lock);
1810                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1811                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1812                         if (ret)
1813                                 break;
1814                 }
1815                 read_unlock_bh(&idev->lock);
1816         }
1817         rcu_read_unlock();
1818
1819         return ret;
1820 }
1821 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1822
1823 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1824 {
1825         struct inet6_dev *idev;
1826         struct inet6_ifaddr *ifa;
1827         int     onlink;
1828
1829         onlink = 0;
1830         rcu_read_lock();
1831         idev = __in6_dev_get(dev);
1832         if (idev) {
1833                 read_lock_bh(&idev->lock);
1834                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1835                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1836                                                    ifa->prefix_len);
1837                         if (onlink)
1838                                 break;
1839                 }
1840                 read_unlock_bh(&idev->lock);
1841         }
1842         rcu_read_unlock();
1843         return onlink;
1844 }
1845 EXPORT_SYMBOL(ipv6_chk_prefix);
1846
1847 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1848                                      struct net_device *dev, int strict)
1849 {
1850         struct inet6_ifaddr *ifp, *result = NULL;
1851         unsigned int hash = inet6_addr_hash(addr);
1852
1853         rcu_read_lock_bh();
1854         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1855                 if (!net_eq(dev_net(ifp->idev->dev), net))
1856                         continue;
1857                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1858                         if (!dev || ifp->idev->dev == dev ||
1859                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1860                                 result = ifp;
1861                                 in6_ifa_hold(ifp);
1862                                 break;
1863                         }
1864                 }
1865         }
1866         rcu_read_unlock_bh();
1867
1868         return result;
1869 }
1870
1871 /* Gets referenced address, destroys ifaddr */
1872
1873 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1874 {
1875         if (dad_failed)
1876                 ifp->flags |= IFA_F_DADFAILED;
1877
1878         if (ifp->flags&IFA_F_PERMANENT) {
1879                 spin_lock_bh(&ifp->lock);
1880                 addrconf_del_dad_work(ifp);
1881                 ifp->flags |= IFA_F_TENTATIVE;
1882                 spin_unlock_bh(&ifp->lock);
1883                 if (dad_failed)
1884                         ipv6_ifa_notify(0, ifp);
1885                 in6_ifa_put(ifp);
1886         } else if (ifp->flags&IFA_F_TEMPORARY) {
1887                 struct inet6_ifaddr *ifpub;
1888                 spin_lock_bh(&ifp->lock);
1889                 ifpub = ifp->ifpub;
1890                 if (ifpub) {
1891                         in6_ifa_hold(ifpub);
1892                         spin_unlock_bh(&ifp->lock);
1893                         ipv6_create_tempaddr(ifpub, ifp);
1894                         in6_ifa_put(ifpub);
1895                 } else {
1896                         spin_unlock_bh(&ifp->lock);
1897                 }
1898                 ipv6_del_addr(ifp);
1899         } else {
1900                 ipv6_del_addr(ifp);
1901         }
1902 }
1903
1904 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1905 {
1906         int err = -ENOENT;
1907
1908         spin_lock_bh(&ifp->lock);
1909         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1910                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1911                 err = 0;
1912         }
1913         spin_unlock_bh(&ifp->lock);
1914
1915         return err;
1916 }
1917
1918 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1919 {
1920         struct inet6_dev *idev = ifp->idev;
1921         struct net *net = dev_net(ifp->idev->dev);
1922
1923         if (addrconf_dad_end(ifp)) {
1924                 in6_ifa_put(ifp);
1925                 return;
1926         }
1927
1928         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1929                              ifp->idev->dev->name, &ifp->addr);
1930
1931         spin_lock_bh(&ifp->lock);
1932
1933         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1934                 int scope = ifp->scope;
1935                 u32 flags = ifp->flags;
1936                 struct in6_addr new_addr;
1937                 struct inet6_ifaddr *ifp2;
1938                 u32 valid_lft, preferred_lft;
1939                 int pfxlen = ifp->prefix_len;
1940                 int retries = ifp->stable_privacy_retry + 1;
1941
1942                 if (retries > net->ipv6.sysctl.idgen_retries) {
1943                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1944                                              ifp->idev->dev->name);
1945                         goto errdad;
1946                 }
1947
1948                 new_addr = ifp->addr;
1949                 if (ipv6_generate_stable_address(&new_addr, retries,
1950                                                  idev))
1951                         goto errdad;
1952
1953                 valid_lft = ifp->valid_lft;
1954                 preferred_lft = ifp->prefered_lft;
1955
1956                 spin_unlock_bh(&ifp->lock);
1957
1958                 if (idev->cnf.max_addresses &&
1959                     ipv6_count_addresses(idev) >=
1960                     idev->cnf.max_addresses)
1961                         goto lock_errdad;
1962
1963                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1964                                      ifp->idev->dev->name);
1965
1966                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1967                                      scope, flags, valid_lft,
1968                                      preferred_lft);
1969                 if (IS_ERR(ifp2))
1970                         goto lock_errdad;
1971
1972                 spin_lock_bh(&ifp2->lock);
1973                 ifp2->stable_privacy_retry = retries;
1974                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1975                 spin_unlock_bh(&ifp2->lock);
1976
1977                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1978                 in6_ifa_put(ifp2);
1979 lock_errdad:
1980                 spin_lock_bh(&ifp->lock);
1981         }
1982
1983 errdad:
1984         /* transition from _POSTDAD to _ERRDAD */
1985         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1986         spin_unlock_bh(&ifp->lock);
1987
1988         addrconf_mod_dad_work(ifp, 0);
1989         in6_ifa_put(ifp);
1990 }
1991
1992 /* Join to solicited addr multicast group.
1993  * caller must hold RTNL */
1994 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1995 {
1996         struct in6_addr maddr;
1997
1998         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1999                 return;
2000
2001         addrconf_addr_solict_mult(addr, &maddr);
2002         ipv6_dev_mc_inc(dev, &maddr);
2003 }
2004
2005 /* caller must hold RTNL */
2006 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2007 {
2008         struct in6_addr maddr;
2009
2010         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2011                 return;
2012
2013         addrconf_addr_solict_mult(addr, &maddr);
2014         __ipv6_dev_mc_dec(idev, &maddr);
2015 }
2016
2017 /* caller must hold RTNL */
2018 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2019 {
2020         struct in6_addr addr;
2021
2022         if (ifp->prefix_len >= 127) /* RFC 6164 */
2023                 return;
2024         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2025         if (ipv6_addr_any(&addr))
2026                 return;
2027         __ipv6_dev_ac_inc(ifp->idev, &addr);
2028 }
2029
2030 /* caller must hold RTNL */
2031 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2032 {
2033         struct in6_addr addr;
2034
2035         if (ifp->prefix_len >= 127) /* RFC 6164 */
2036                 return;
2037         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2038         if (ipv6_addr_any(&addr))
2039                 return;
2040         __ipv6_dev_ac_dec(ifp->idev, &addr);
2041 }
2042
2043 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2044 {
2045         if (dev->addr_len != EUI64_ADDR_LEN)
2046                 return -1;
2047         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2048         eui[0] ^= 2;
2049         return 0;
2050 }
2051
2052 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2053 {
2054         union fwnet_hwaddr *ha;
2055
2056         if (dev->addr_len != FWNET_ALEN)
2057                 return -1;
2058
2059         ha = (union fwnet_hwaddr *)dev->dev_addr;
2060
2061         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2062         eui[0] ^= 2;
2063         return 0;
2064 }
2065
2066 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2067 {
2068         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2069         if (dev->addr_len != ARCNET_ALEN)
2070                 return -1;
2071         memset(eui, 0, 7);
2072         eui[7] = *(u8 *)dev->dev_addr;
2073         return 0;
2074 }
2075
2076 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2077 {
2078         if (dev->addr_len != INFINIBAND_ALEN)
2079                 return -1;
2080         memcpy(eui, dev->dev_addr + 12, 8);
2081         eui[0] |= 2;
2082         return 0;
2083 }
2084
2085 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2086 {
2087         if (addr == 0)
2088                 return -1;
2089         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2090                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2091                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2092                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2093                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2094                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2095         eui[1] = 0;
2096         eui[2] = 0x5E;
2097         eui[3] = 0xFE;
2098         memcpy(eui + 4, &addr, 4);
2099         return 0;
2100 }
2101
2102 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2103 {
2104         if (dev->priv_flags & IFF_ISATAP)
2105                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2106         return -1;
2107 }
2108
2109 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2110 {
2111         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2112 }
2113
2114 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2115 {
2116         memcpy(eui, dev->perm_addr, 3);
2117         memcpy(eui + 5, dev->perm_addr + 3, 3);
2118         eui[3] = 0xFF;
2119         eui[4] = 0xFE;
2120         eui[0] ^= 2;
2121         return 0;
2122 }
2123
2124 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2125 {
2126         switch (dev->type) {
2127         case ARPHRD_ETHER:
2128         case ARPHRD_FDDI:
2129                 return addrconf_ifid_eui48(eui, dev);
2130         case ARPHRD_ARCNET:
2131                 return addrconf_ifid_arcnet(eui, dev);
2132         case ARPHRD_INFINIBAND:
2133                 return addrconf_ifid_infiniband(eui, dev);
2134         case ARPHRD_SIT:
2135                 return addrconf_ifid_sit(eui, dev);
2136         case ARPHRD_IPGRE:
2137                 return addrconf_ifid_gre(eui, dev);
2138         case ARPHRD_6LOWPAN:
2139                 return addrconf_ifid_eui64(eui, dev);
2140         case ARPHRD_IEEE1394:
2141                 return addrconf_ifid_ieee1394(eui, dev);
2142         case ARPHRD_TUNNEL6:
2143                 return addrconf_ifid_ip6tnl(eui, dev);
2144         }
2145         return -1;
2146 }
2147
2148 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2149 {
2150         int err = -1;
2151         struct inet6_ifaddr *ifp;
2152
2153         read_lock_bh(&idev->lock);
2154         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2155                 if (ifp->scope > IFA_LINK)
2156                         break;
2157                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2158                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2159                         err = 0;
2160                         break;
2161                 }
2162         }
2163         read_unlock_bh(&idev->lock);
2164         return err;
2165 }
2166
2167 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2168 static void ipv6_regen_rndid(struct inet6_dev *idev)
2169 {
2170 regen:
2171         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2172         idev->rndid[0] &= ~0x02;
2173
2174         /*
2175          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2176          * check if generated address is not inappropriate
2177          *
2178          *  - Reserved subnet anycast (RFC 2526)
2179          *      11111101 11....11 1xxxxxxx
2180          *  - ISATAP (RFC4214) 6.1
2181          *      00-00-5E-FE-xx-xx-xx-xx
2182          *  - value 0
2183          *  - XXX: already assigned to an address on the device
2184          */
2185         if (idev->rndid[0] == 0xfd &&
2186             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2187             (idev->rndid[7]&0x80))
2188                 goto regen;
2189         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2190                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2191                         goto regen;
2192                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2193                         goto regen;
2194         }
2195 }
2196
2197 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2198 {
2199         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2200                 ipv6_regen_rndid(idev);
2201 }
2202
2203 /*
2204  *      Add prefix route.
2205  */
2206
2207 static void
2208 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2209                       unsigned long expires, u32 flags)
2210 {
2211         struct fib6_config cfg = {
2212                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2213                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2214                 .fc_ifindex = dev->ifindex,
2215                 .fc_expires = expires,
2216                 .fc_dst_len = plen,
2217                 .fc_flags = RTF_UP | flags,
2218                 .fc_nlinfo.nl_net = dev_net(dev),
2219                 .fc_protocol = RTPROT_KERNEL,
2220         };
2221
2222         cfg.fc_dst = *pfx;
2223
2224         /* Prevent useless cloning on PtP SIT.
2225            This thing is done here expecting that the whole
2226            class of non-broadcast devices need not cloning.
2227          */
2228 #if IS_ENABLED(CONFIG_IPV6_SIT)
2229         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2230                 cfg.fc_flags |= RTF_NONEXTHOP;
2231 #endif
2232
2233         ip6_route_add(&cfg);
2234 }
2235
2236
2237 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2238                                                   int plen,
2239                                                   const struct net_device *dev,
2240                                                   u32 flags, u32 noflags)
2241 {
2242         struct fib6_node *fn;
2243         struct rt6_info *rt = NULL;
2244         struct fib6_table *table;
2245         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2246
2247         table = fib6_get_table(dev_net(dev), tb_id);
2248         if (!table)
2249                 return NULL;
2250
2251         read_lock_bh(&table->tb6_lock);
2252         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2253         if (!fn)
2254                 goto out;
2255
2256         noflags |= RTF_CACHE;
2257         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2258                 if (rt->dst.dev->ifindex != dev->ifindex)
2259                         continue;
2260                 if ((rt->rt6i_flags & flags) != flags)
2261                         continue;
2262                 if ((rt->rt6i_flags & noflags) != 0)
2263                         continue;
2264                 dst_hold(&rt->dst);
2265                 break;
2266         }
2267 out:
2268         read_unlock_bh(&table->tb6_lock);
2269         return rt;
2270 }
2271
2272
2273 /* Create "default" multicast route to the interface */
2274
2275 static void addrconf_add_mroute(struct net_device *dev)
2276 {
2277         struct fib6_config cfg = {
2278                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2279                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2280                 .fc_ifindex = dev->ifindex,
2281                 .fc_dst_len = 8,
2282                 .fc_flags = RTF_UP,
2283                 .fc_nlinfo.nl_net = dev_net(dev),
2284         };
2285
2286         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2287
2288         ip6_route_add(&cfg);
2289 }
2290
2291 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2292 {
2293         struct inet6_dev *idev;
2294
2295         ASSERT_RTNL();
2296
2297         idev = ipv6_find_idev(dev);
2298         if (!idev)
2299                 return ERR_PTR(-ENOBUFS);
2300
2301         if (idev->cnf.disable_ipv6)
2302                 return ERR_PTR(-EACCES);
2303
2304         /* Add default multicast route */
2305         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2306                 addrconf_add_mroute(dev);
2307
2308         return idev;
2309 }
2310
2311 static void manage_tempaddrs(struct inet6_dev *idev,
2312                              struct inet6_ifaddr *ifp,
2313                              __u32 valid_lft, __u32 prefered_lft,
2314                              bool create, unsigned long now)
2315 {
2316         u32 flags;
2317         struct inet6_ifaddr *ift;
2318
2319         read_lock_bh(&idev->lock);
2320         /* update all temporary addresses in the list */
2321         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2322                 int age, max_valid, max_prefered;
2323
2324                 if (ifp != ift->ifpub)
2325                         continue;
2326
2327                 /* RFC 4941 section 3.3:
2328                  * If a received option will extend the lifetime of a public
2329                  * address, the lifetimes of temporary addresses should
2330                  * be extended, subject to the overall constraint that no
2331                  * temporary addresses should ever remain "valid" or "preferred"
2332                  * for a time longer than (TEMP_VALID_LIFETIME) or
2333                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2334                  */
2335                 age = (now - ift->cstamp) / HZ;
2336                 max_valid = idev->cnf.temp_valid_lft - age;
2337                 if (max_valid < 0)
2338                         max_valid = 0;
2339
2340                 max_prefered = idev->cnf.temp_prefered_lft -
2341                                idev->desync_factor - age;
2342                 if (max_prefered < 0)
2343                         max_prefered = 0;
2344
2345                 if (valid_lft > max_valid)
2346                         valid_lft = max_valid;
2347
2348                 if (prefered_lft > max_prefered)
2349                         prefered_lft = max_prefered;
2350
2351                 spin_lock(&ift->lock);
2352                 flags = ift->flags;
2353                 ift->valid_lft = valid_lft;
2354                 ift->prefered_lft = prefered_lft;
2355                 ift->tstamp = now;
2356                 if (prefered_lft > 0)
2357                         ift->flags &= ~IFA_F_DEPRECATED;
2358
2359                 spin_unlock(&ift->lock);
2360                 if (!(flags&IFA_F_TENTATIVE))
2361                         ipv6_ifa_notify(0, ift);
2362         }
2363
2364         if ((create || list_empty(&idev->tempaddr_list)) &&
2365             idev->cnf.use_tempaddr > 0) {
2366                 /* When a new public address is created as described
2367                  * in [ADDRCONF], also create a new temporary address.
2368                  * Also create a temporary address if it's enabled but
2369                  * no temporary address currently exists.
2370                  */
2371                 read_unlock_bh(&idev->lock);
2372                 ipv6_create_tempaddr(ifp, NULL);
2373         } else {
2374                 read_unlock_bh(&idev->lock);
2375         }
2376 }
2377
2378 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2379 {
2380         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2381                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2382 }
2383
2384 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2385                                  const struct prefix_info *pinfo,
2386                                  struct inet6_dev *in6_dev,
2387                                  const struct in6_addr *addr, int addr_type,
2388                                  u32 addr_flags, bool sllao, bool tokenized,
2389                                  __u32 valid_lft, u32 prefered_lft)
2390 {
2391         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2392         int create = 0, update_lft = 0;
2393
2394         if (!ifp && valid_lft) {
2395                 int max_addresses = in6_dev->cnf.max_addresses;
2396
2397 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2398                 if (in6_dev->cnf.optimistic_dad &&
2399                     !net->ipv6.devconf_all->forwarding && sllao)
2400                         addr_flags |= IFA_F_OPTIMISTIC;
2401 #endif
2402
2403                 /* Do not allow to create too much of autoconfigured
2404                  * addresses; this would be too easy way to crash kernel.
2405                  */
2406                 if (!max_addresses ||
2407                     ipv6_count_addresses(in6_dev) < max_addresses)
2408                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2409                                             pinfo->prefix_len,
2410                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2411                                             addr_flags, valid_lft,
2412                                             prefered_lft);
2413
2414                 if (IS_ERR_OR_NULL(ifp))
2415                         return -1;
2416
2417                 update_lft = 0;
2418                 create = 1;
2419                 spin_lock_bh(&ifp->lock);
2420                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2421                 ifp->cstamp = jiffies;
2422                 ifp->tokenized = tokenized;
2423                 spin_unlock_bh(&ifp->lock);
2424                 addrconf_dad_start(ifp);
2425         }
2426
2427         if (ifp) {
2428                 u32 flags;
2429                 unsigned long now;
2430                 u32 stored_lft;
2431
2432                 /* update lifetime (RFC2462 5.5.3 e) */
2433                 spin_lock_bh(&ifp->lock);
2434                 now = jiffies;
2435                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2436                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2437                 else
2438                         stored_lft = 0;
2439                 if (!update_lft && !create && stored_lft) {
2440                         const u32 minimum_lft = min_t(u32,
2441                                 stored_lft, MIN_VALID_LIFETIME);
2442                         valid_lft = max(valid_lft, minimum_lft);
2443
2444                         /* RFC4862 Section 5.5.3e:
2445                          * "Note that the preferred lifetime of the
2446                          *  corresponding address is always reset to
2447                          *  the Preferred Lifetime in the received
2448                          *  Prefix Information option, regardless of
2449                          *  whether the valid lifetime is also reset or
2450                          *  ignored."
2451                          *
2452                          * So we should always update prefered_lft here.
2453                          */
2454                         update_lft = 1;
2455                 }
2456
2457                 if (update_lft) {
2458                         ifp->valid_lft = valid_lft;
2459                         ifp->prefered_lft = prefered_lft;
2460                         ifp->tstamp = now;
2461                         flags = ifp->flags;
2462                         ifp->flags &= ~IFA_F_DEPRECATED;
2463                         spin_unlock_bh(&ifp->lock);
2464
2465                         if (!(flags&IFA_F_TENTATIVE))
2466                                 ipv6_ifa_notify(0, ifp);
2467                 } else
2468                         spin_unlock_bh(&ifp->lock);
2469
2470                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2471                                  create, now);
2472
2473                 in6_ifa_put(ifp);
2474                 addrconf_verify();
2475         }
2476
2477         return 0;
2478 }
2479 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2480
2481 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2482 {
2483         struct prefix_info *pinfo;
2484         __u32 valid_lft;
2485         __u32 prefered_lft;
2486         int addr_type, err;
2487         u32 addr_flags = 0;
2488         struct inet6_dev *in6_dev;
2489         struct net *net = dev_net(dev);
2490
2491         pinfo = (struct prefix_info *) opt;
2492
2493         if (len < sizeof(struct prefix_info)) {
2494                 ADBG("addrconf: prefix option too short\n");
2495                 return;
2496         }
2497
2498         /*
2499          *      Validation checks ([ADDRCONF], page 19)
2500          */
2501
2502         addr_type = ipv6_addr_type(&pinfo->prefix);
2503
2504         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2505                 return;
2506
2507         valid_lft = ntohl(pinfo->valid);
2508         prefered_lft = ntohl(pinfo->prefered);
2509
2510         if (prefered_lft > valid_lft) {
2511                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2512                 return;
2513         }
2514
2515         in6_dev = in6_dev_get(dev);
2516
2517         if (!in6_dev) {
2518                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2519                                     dev->name);
2520                 return;
2521         }
2522
2523         /*
2524          *      Two things going on here:
2525          *      1) Add routes for on-link prefixes
2526          *      2) Configure prefixes with the auto flag set
2527          */
2528
2529         if (pinfo->onlink) {
2530                 struct rt6_info *rt;
2531                 unsigned long rt_expires;
2532
2533                 /* Avoid arithmetic overflow. Really, we could
2534                  * save rt_expires in seconds, likely valid_lft,
2535                  * but it would require division in fib gc, that it
2536                  * not good.
2537                  */
2538                 if (HZ > USER_HZ)
2539                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2540                 else
2541                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2542
2543                 if (addrconf_finite_timeout(rt_expires))
2544                         rt_expires *= HZ;
2545
2546                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2547                                                pinfo->prefix_len,
2548                                                dev,
2549                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2550                                                RTF_GATEWAY | RTF_DEFAULT);
2551
2552                 if (rt) {
2553                         /* Autoconf prefix route */
2554                         if (valid_lft == 0) {
2555                                 ip6_del_rt(rt);
2556                                 rt = NULL;
2557                         } else if (addrconf_finite_timeout(rt_expires)) {
2558                                 /* not infinity */
2559                                 rt6_set_expires(rt, jiffies + rt_expires);
2560                         } else {
2561                                 rt6_clean_expires(rt);
2562                         }
2563                 } else if (valid_lft) {
2564                         clock_t expires = 0;
2565                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2566                         if (addrconf_finite_timeout(rt_expires)) {
2567                                 /* not infinity */
2568                                 flags |= RTF_EXPIRES;
2569                                 expires = jiffies_to_clock_t(rt_expires);
2570                         }
2571                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2572                                               dev, expires, flags);
2573                 }
2574                 ip6_rt_put(rt);
2575         }
2576
2577         /* Try to figure out our local address for this prefix */
2578
2579         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2580                 struct in6_addr addr;
2581                 bool tokenized = false, dev_addr_generated = false;
2582
2583                 if (pinfo->prefix_len == 64) {
2584                         memcpy(&addr, &pinfo->prefix, 8);
2585
2586                         if (!ipv6_addr_any(&in6_dev->token)) {
2587                                 read_lock_bh(&in6_dev->lock);
2588                                 memcpy(addr.s6_addr + 8,
2589                                        in6_dev->token.s6_addr + 8, 8);
2590                                 read_unlock_bh(&in6_dev->lock);
2591                                 tokenized = true;
2592                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2593                                    !ipv6_generate_stable_address(&addr, 0,
2594                                                                  in6_dev)) {
2595                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2596                                 goto ok;
2597                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2598                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2599                                 goto put;
2600                         } else {
2601                                 dev_addr_generated = true;
2602                         }
2603                         goto ok;
2604                 }
2605                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2606                                     pinfo->prefix_len);
2607                 goto put;
2608
2609 ok:
2610                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2611                                                    &addr, addr_type,
2612                                                    addr_flags, sllao,
2613                                                    tokenized, valid_lft,
2614                                                    prefered_lft);
2615                 if (err)
2616                         goto put;
2617
2618                 /* Ignore error case here because previous prefix add addr was
2619                  * successful which will be notified.
2620                  */
2621                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2622                                               addr_type, addr_flags, sllao,
2623                                               tokenized, valid_lft,
2624                                               prefered_lft,
2625                                               dev_addr_generated);
2626         }
2627         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2628 put:
2629         in6_dev_put(in6_dev);
2630 }
2631
2632 /*
2633  *      Set destination address.
2634  *      Special case for SIT interfaces where we create a new "virtual"
2635  *      device.
2636  */
2637 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2638 {
2639         struct in6_ifreq ireq;
2640         struct net_device *dev;
2641         int err = -EINVAL;
2642
2643         rtnl_lock();
2644
2645         err = -EFAULT;
2646         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2647                 goto err_exit;
2648
2649         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2650
2651         err = -ENODEV;
2652         if (!dev)
2653                 goto err_exit;
2654
2655 #if IS_ENABLED(CONFIG_IPV6_SIT)
2656         if (dev->type == ARPHRD_SIT) {
2657                 const struct net_device_ops *ops = dev->netdev_ops;
2658                 struct ifreq ifr;
2659                 struct ip_tunnel_parm p;
2660
2661                 err = -EADDRNOTAVAIL;
2662                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2663                         goto err_exit;
2664
2665                 memset(&p, 0, sizeof(p));
2666                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2667                 p.iph.saddr = 0;
2668                 p.iph.version = 4;
2669                 p.iph.ihl = 5;
2670                 p.iph.protocol = IPPROTO_IPV6;
2671                 p.iph.ttl = 64;
2672                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2673
2674                 if (ops->ndo_do_ioctl) {
2675                         mm_segment_t oldfs = get_fs();
2676
2677                         set_fs(KERNEL_DS);
2678                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2679                         set_fs(oldfs);
2680                 } else
2681                         err = -EOPNOTSUPP;
2682
2683                 if (err == 0) {
2684                         err = -ENOBUFS;
2685                         dev = __dev_get_by_name(net, p.name);
2686                         if (!dev)
2687                                 goto err_exit;
2688                         err = dev_open(dev);
2689                 }
2690         }
2691 #endif
2692
2693 err_exit:
2694         rtnl_unlock();
2695         return err;
2696 }
2697
2698 static int ipv6_mc_config(struct sock *sk, bool join,
2699                           const struct in6_addr *addr, int ifindex)
2700 {
2701         int ret;
2702
2703         ASSERT_RTNL();
2704
2705         lock_sock(sk);
2706         if (join)
2707                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2708         else
2709                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2710         release_sock(sk);
2711
2712         return ret;
2713 }
2714
2715 /*
2716  *      Manual configuration of address on an interface
2717  */
2718 static int inet6_addr_add(struct net *net, int ifindex,
2719                           const struct in6_addr *pfx,
2720                           const struct in6_addr *peer_pfx,
2721                           unsigned int plen, __u32 ifa_flags,
2722                           __u32 prefered_lft, __u32 valid_lft)
2723 {
2724         struct inet6_ifaddr *ifp;
2725         struct inet6_dev *idev;
2726         struct net_device *dev;
2727         unsigned long timeout;
2728         clock_t expires;
2729         int scope;
2730         u32 flags;
2731
2732         ASSERT_RTNL();
2733
2734         if (plen > 128)
2735                 return -EINVAL;
2736
2737         /* check the lifetime */
2738         if (!valid_lft || prefered_lft > valid_lft)
2739                 return -EINVAL;
2740
2741         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2742                 return -EINVAL;
2743
2744         dev = __dev_get_by_index(net, ifindex);
2745         if (!dev)
2746                 return -ENODEV;
2747
2748         idev = addrconf_add_dev(dev);
2749         if (IS_ERR(idev))
2750                 return PTR_ERR(idev);
2751
2752         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2753                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2754                                          true, pfx, ifindex);
2755
2756                 if (ret < 0)
2757                         return ret;
2758         }
2759
2760         scope = ipv6_addr_scope(pfx);
2761
2762         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2763         if (addrconf_finite_timeout(timeout)) {
2764                 expires = jiffies_to_clock_t(timeout * HZ);
2765                 valid_lft = timeout;
2766                 flags = RTF_EXPIRES;
2767         } else {
2768                 expires = 0;
2769                 flags = 0;
2770                 ifa_flags |= IFA_F_PERMANENT;
2771         }
2772
2773         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2774         if (addrconf_finite_timeout(timeout)) {
2775                 if (timeout == 0)
2776                         ifa_flags |= IFA_F_DEPRECATED;
2777                 prefered_lft = timeout;
2778         }
2779
2780         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2781                             valid_lft, prefered_lft);
2782
2783         if (!IS_ERR(ifp)) {
2784                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2785                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2786                                               expires, flags);
2787                 }
2788
2789                 /*
2790                  * Note that section 3.1 of RFC 4429 indicates
2791                  * that the Optimistic flag should not be set for
2792                  * manually configured addresses
2793                  */
2794                 addrconf_dad_start(ifp);
2795                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2796                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2797                                          true, jiffies);
2798                 in6_ifa_put(ifp);
2799                 addrconf_verify_rtnl();
2800                 return 0;
2801         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2802                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2803                                false, pfx, ifindex);
2804         }
2805
2806         return PTR_ERR(ifp);
2807 }
2808
2809 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2810                           const struct in6_addr *pfx, unsigned int plen)
2811 {
2812         struct inet6_ifaddr *ifp;
2813         struct inet6_dev *idev;
2814         struct net_device *dev;
2815
2816         if (plen > 128)
2817                 return -EINVAL;
2818
2819         dev = __dev_get_by_index(net, ifindex);
2820         if (!dev)
2821                 return -ENODEV;
2822
2823         idev = __in6_dev_get(dev);
2824         if (!idev)
2825                 return -ENXIO;
2826
2827         read_lock_bh(&idev->lock);
2828         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2829                 if (ifp->prefix_len == plen &&
2830                     ipv6_addr_equal(pfx, &ifp->addr)) {
2831                         in6_ifa_hold(ifp);
2832                         read_unlock_bh(&idev->lock);
2833
2834                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2835                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2836                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2837                                                  jiffies);
2838                         ipv6_del_addr(ifp);
2839                         addrconf_verify_rtnl();
2840                         if (ipv6_addr_is_multicast(pfx)) {
2841                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2842                                                false, pfx, dev->ifindex);
2843                         }
2844                         return 0;
2845                 }
2846         }
2847         read_unlock_bh(&idev->lock);
2848         return -EADDRNOTAVAIL;
2849 }
2850
2851
2852 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2853 {
2854         struct in6_ifreq ireq;
2855         int err;
2856
2857         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2858                 return -EPERM;
2859
2860         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2861                 return -EFAULT;
2862
2863         rtnl_lock();
2864         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2865                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2866                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2867         rtnl_unlock();
2868         return err;
2869 }
2870
2871 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2872 {
2873         struct in6_ifreq ireq;
2874         int err;
2875
2876         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2877                 return -EPERM;
2878
2879         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2880                 return -EFAULT;
2881
2882         rtnl_lock();
2883         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2884                              ireq.ifr6_prefixlen);
2885         rtnl_unlock();
2886         return err;
2887 }
2888
2889 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2890                      int plen, int scope)
2891 {
2892         struct inet6_ifaddr *ifp;
2893
2894         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2895                             scope, IFA_F_PERMANENT,
2896                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2897         if (!IS_ERR(ifp)) {
2898                 spin_lock_bh(&ifp->lock);
2899                 ifp->flags &= ~IFA_F_TENTATIVE;
2900                 spin_unlock_bh(&ifp->lock);
2901                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2902                 in6_ifa_put(ifp);
2903         }
2904 }
2905
2906 #if IS_ENABLED(CONFIG_IPV6_SIT)
2907 static void sit_add_v4_addrs(struct inet6_dev *idev)
2908 {
2909         struct in6_addr addr;
2910         struct net_device *dev;
2911         struct net *net = dev_net(idev->dev);
2912         int scope, plen;
2913         u32 pflags = 0;
2914
2915         ASSERT_RTNL();
2916
2917         memset(&addr, 0, sizeof(struct in6_addr));
2918         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2919
2920         if (idev->dev->flags&IFF_POINTOPOINT) {
2921                 addr.s6_addr32[0] = htonl(0xfe800000);
2922                 scope = IFA_LINK;
2923                 plen = 64;
2924         } else {
2925                 scope = IPV6_ADDR_COMPATv4;
2926                 plen = 96;
2927                 pflags |= RTF_NONEXTHOP;
2928         }
2929
2930         if (addr.s6_addr32[3]) {
2931                 add_addr(idev, &addr, plen, scope);
2932                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2933                 return;
2934         }
2935
2936         for_each_netdev(net, dev) {
2937                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2938                 if (in_dev && (dev->flags & IFF_UP)) {
2939                         struct in_ifaddr *ifa;
2940
2941                         int flag = scope;
2942
2943                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2944
2945                                 addr.s6_addr32[3] = ifa->ifa_local;
2946
2947                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2948                                         continue;
2949                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2950                                         if (idev->dev->flags&IFF_POINTOPOINT)
2951                                                 continue;
2952                                         flag |= IFA_HOST;
2953                                 }
2954
2955                                 add_addr(idev, &addr, plen, flag);
2956                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2957                                                       pflags);
2958                         }
2959                 }
2960         }
2961 }
2962 #endif
2963
2964 static void init_loopback(struct net_device *dev)
2965 {
2966         struct inet6_dev  *idev;
2967         struct net_device *sp_dev;
2968         struct inet6_ifaddr *sp_ifa;
2969         struct rt6_info *sp_rt;
2970
2971         /* ::1 */
2972
2973         ASSERT_RTNL();
2974
2975         idev = ipv6_find_idev(dev);
2976         if (!idev) {
2977                 pr_debug("%s: add_dev failed\n", __func__);
2978                 return;
2979         }
2980
2981         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2982
2983         /* Add routes to other interface's IPv6 addresses */
2984         for_each_netdev(dev_net(dev), sp_dev) {
2985                 if (!strcmp(sp_dev->name, dev->name))
2986                         continue;
2987
2988                 idev = __in6_dev_get(sp_dev);
2989                 if (!idev)
2990                         continue;
2991
2992                 read_lock_bh(&idev->lock);
2993                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2994
2995                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2996                                 continue;
2997
2998                         if (sp_ifa->rt) {
2999                                 /* This dst has been added to garbage list when
3000                                  * lo device down, release this obsolete dst and
3001                                  * reallocate a new router for ifa.
3002                                  */
3003                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3004                                         ip6_rt_put(sp_ifa->rt);
3005                                         sp_ifa->rt = NULL;
3006                                 } else {
3007                                         continue;
3008                                 }
3009                         }
3010
3011                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3012
3013                         /* Failure cases are ignored */
3014                         if (!IS_ERR(sp_rt)) {
3015                                 sp_ifa->rt = sp_rt;
3016                                 ip6_ins_rt(sp_rt);
3017                         }
3018                 }
3019                 read_unlock_bh(&idev->lock);
3020         }
3021 }
3022
3023 void addrconf_add_linklocal(struct inet6_dev *idev,
3024                             const struct in6_addr *addr, u32 flags)
3025 {
3026         struct inet6_ifaddr *ifp;
3027         u32 addr_flags = flags | IFA_F_PERMANENT;
3028
3029 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3030         if (idev->cnf.optimistic_dad &&
3031             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3032                 addr_flags |= IFA_F_OPTIMISTIC;
3033 #endif
3034
3035         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3036                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3037         if (!IS_ERR(ifp)) {
3038                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3039                 addrconf_dad_start(ifp);
3040                 in6_ifa_put(ifp);
3041         }
3042 }
3043 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3044
3045 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3046 {
3047         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3048                 return true;
3049
3050         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3051             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3052                 return true;
3053
3054         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3055             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3056                 return true;
3057
3058         return false;
3059 }
3060
3061 static int ipv6_generate_stable_address(struct in6_addr *address,
3062                                         u8 dad_count,
3063                                         const struct inet6_dev *idev)
3064 {
3065         static DEFINE_SPINLOCK(lock);
3066         static __u32 digest[SHA_DIGEST_WORDS];
3067         static __u32 workspace[SHA_WORKSPACE_WORDS];
3068
3069         static union {
3070                 char __data[SHA_MESSAGE_BYTES];
3071                 struct {
3072                         struct in6_addr secret;
3073                         __be32 prefix[2];
3074                         unsigned char hwaddr[MAX_ADDR_LEN];
3075                         u8 dad_count;
3076                 } __packed;
3077         } data;
3078
3079         struct in6_addr secret;
3080         struct in6_addr temp;
3081         struct net *net = dev_net(idev->dev);
3082
3083         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3084
3085         if (idev->cnf.stable_secret.initialized)
3086                 secret = idev->cnf.stable_secret.secret;
3087         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3088                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3089         else
3090                 return -1;
3091
3092 retry:
3093         spin_lock_bh(&lock);
3094
3095         sha_init(digest);
3096         memset(&data, 0, sizeof(data));
3097         memset(workspace, 0, sizeof(workspace));
3098         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3099         data.prefix[0] = address->s6_addr32[0];
3100         data.prefix[1] = address->s6_addr32[1];
3101         data.secret = secret;
3102         data.dad_count = dad_count;
3103
3104         sha_transform(digest, data.__data, workspace);
3105
3106         temp = *address;
3107         temp.s6_addr32[2] = (__force __be32)digest[0];
3108         temp.s6_addr32[3] = (__force __be32)digest[1];
3109
3110         spin_unlock_bh(&lock);
3111
3112         if (ipv6_reserved_interfaceid(temp)) {
3113                 dad_count++;
3114                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3115                         return -1;
3116                 goto retry;
3117         }
3118
3119         *address = temp;
3120         return 0;
3121 }
3122
3123 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3124 {
3125         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3126
3127         if (s->initialized)
3128                 return;
3129         s = &idev->cnf.stable_secret;
3130         get_random_bytes(&s->secret, sizeof(s->secret));
3131         s->initialized = true;
3132 }
3133
3134 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3135 {
3136         struct in6_addr addr;
3137
3138         /* no link local addresses on L3 master devices */
3139         if (netif_is_l3_master(idev->dev))
3140                 return;
3141
3142         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3143
3144         switch (idev->addr_gen_mode) {
3145         case IN6_ADDR_GEN_MODE_RANDOM:
3146                 ipv6_gen_mode_random_init(idev);
3147                 /* fallthrough */
3148         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3149                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3150                         addrconf_add_linklocal(idev, &addr,
3151                                                IFA_F_STABLE_PRIVACY);
3152                 else if (prefix_route)
3153                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3154                 break;
3155         case IN6_ADDR_GEN_MODE_EUI64:
3156                 /* addrconf_add_linklocal also adds a prefix_route and we
3157                  * only need to care about prefix routes if ipv6_generate_eui64
3158                  * couldn't generate one.
3159                  */
3160                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3161                         addrconf_add_linklocal(idev, &addr, 0);
3162                 else if (prefix_route)
3163                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3164                 break;
3165         case IN6_ADDR_GEN_MODE_NONE:
3166         default:
3167                 /* will not add any link local address */
3168                 break;
3169         }
3170 }
3171
3172 static void addrconf_dev_config(struct net_device *dev)
3173 {
3174         struct inet6_dev *idev;
3175
3176         ASSERT_RTNL();
3177
3178         if ((dev->type != ARPHRD_ETHER) &&
3179             (dev->type != ARPHRD_FDDI) &&
3180             (dev->type != ARPHRD_ARCNET) &&
3181             (dev->type != ARPHRD_INFINIBAND) &&
3182             (dev->type != ARPHRD_IEEE1394) &&
3183             (dev->type != ARPHRD_TUNNEL6) &&
3184             (dev->type != ARPHRD_6LOWPAN) &&
3185             (dev->type != ARPHRD_NONE)) {
3186                 /* Alas, we support only Ethernet autoconfiguration. */
3187                 return;
3188         }
3189
3190         idev = addrconf_add_dev(dev);
3191         if (IS_ERR(idev))
3192                 return;
3193
3194         /* this device type has no EUI support */
3195         if (dev->type == ARPHRD_NONE &&
3196             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3197                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3198
3199         addrconf_addr_gen(idev, false);
3200 }
3201
3202 #if IS_ENABLED(CONFIG_IPV6_SIT)
3203 static void addrconf_sit_config(struct net_device *dev)
3204 {
3205         struct inet6_dev *idev;
3206
3207         ASSERT_RTNL();
3208
3209         /*
3210          * Configure the tunnel with one of our IPv4
3211          * addresses... we should configure all of
3212          * our v4 addrs in the tunnel
3213          */
3214
3215         idev = ipv6_find_idev(dev);
3216         if (!idev) {
3217                 pr_debug("%s: add_dev failed\n", __func__);
3218                 return;
3219         }
3220
3221         if (dev->priv_flags & IFF_ISATAP) {
3222                 addrconf_addr_gen(idev, false);
3223                 return;
3224         }
3225
3226         sit_add_v4_addrs(idev);
3227
3228         if (dev->flags&IFF_POINTOPOINT)
3229                 addrconf_add_mroute(dev);
3230 }
3231 #endif
3232
3233 #if IS_ENABLED(CONFIG_NET_IPGRE)
3234 static void addrconf_gre_config(struct net_device *dev)
3235 {
3236         struct inet6_dev *idev;
3237
3238         ASSERT_RTNL();
3239
3240         idev = ipv6_find_idev(dev);
3241         if (!idev) {
3242                 pr_debug("%s: add_dev failed\n", __func__);
3243                 return;
3244         }
3245
3246         addrconf_addr_gen(idev, true);
3247         if (dev->flags & IFF_POINTOPOINT)
3248                 addrconf_add_mroute(dev);
3249 }
3250 #endif
3251
3252 static int fixup_permanent_addr(struct inet6_dev *idev,
3253                                 struct inet6_ifaddr *ifp)
3254 {
3255         if (!ifp->rt) {
3256                 struct rt6_info *rt;
3257
3258                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3259                 if (unlikely(IS_ERR(rt)))
3260                         return PTR_ERR(rt);
3261
3262                 ifp->rt = rt;
3263         }
3264
3265         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3266                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3267                                       idev->dev, 0, 0);
3268         }
3269
3270         addrconf_dad_start(ifp);
3271
3272         return 0;
3273 }
3274
3275 static void addrconf_permanent_addr(struct net_device *dev)
3276 {
3277         struct inet6_ifaddr *ifp, *tmp;
3278         struct inet6_dev *idev;
3279
3280         idev = __in6_dev_get(dev);
3281         if (!idev)
3282                 return;
3283
3284         write_lock_bh(&idev->lock);
3285
3286         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3287                 if ((ifp->flags & IFA_F_PERMANENT) &&
3288                     fixup_permanent_addr(idev, ifp) < 0) {
3289                         write_unlock_bh(&idev->lock);
3290                         ipv6_del_addr(ifp);
3291                         write_lock_bh(&idev->lock);
3292
3293                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3294                                              idev->dev->name, &ifp->addr);
3295                 }
3296         }
3297
3298         write_unlock_bh(&idev->lock);
3299 }
3300
3301 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3302                            void *ptr)
3303 {
3304         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3305         struct netdev_notifier_changeupper_info *info;
3306         struct inet6_dev *idev = __in6_dev_get(dev);
3307         int run_pending = 0;
3308         int err;
3309
3310         switch (event) {
3311         case NETDEV_REGISTER:
3312                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3313                         idev = ipv6_add_dev(dev);
3314                         if (IS_ERR(idev))
3315                                 return notifier_from_errno(PTR_ERR(idev));
3316                 }
3317                 break;
3318
3319         case NETDEV_CHANGEMTU:
3320                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3321                 if (dev->mtu < IPV6_MIN_MTU) {
3322                         addrconf_ifdown(dev, 1);
3323                         break;
3324                 }
3325
3326                 if (idev) {
3327                         rt6_mtu_change(dev, dev->mtu);
3328                         idev->cnf.mtu6 = dev->mtu;
3329                         break;
3330                 }
3331
3332                 /* allocate new idev */
3333                 idev = ipv6_add_dev(dev);
3334                 if (IS_ERR(idev))
3335                         break;
3336
3337                 /* device is still not ready */
3338                 if (!(idev->if_flags & IF_READY))
3339                         break;
3340
3341                 run_pending = 1;
3342
3343                 /* fall through */
3344
3345         case NETDEV_UP:
3346         case NETDEV_CHANGE:
3347                 if (dev->flags & IFF_SLAVE)
3348                         break;
3349
3350                 if (idev && idev->cnf.disable_ipv6)
3351                         break;
3352
3353                 if (event == NETDEV_UP) {
3354                         /* restore routes for permanent addresses */
3355                         addrconf_permanent_addr(dev);
3356
3357                         if (!addrconf_qdisc_ok(dev)) {
3358                                 /* device is not ready yet. */
3359                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3360                                         dev->name);
3361                                 break;
3362                         }
3363
3364                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3365                                 idev = ipv6_add_dev(dev);
3366
3367                         if (!IS_ERR_OR_NULL(idev)) {
3368                                 idev->if_flags |= IF_READY;
3369                                 run_pending = 1;
3370                         }
3371                 } else if (event == NETDEV_CHANGE) {
3372                         if (!addrconf_qdisc_ok(dev)) {
3373                                 /* device is still not ready. */
3374                                 break;
3375                         }
3376
3377                         if (idev) {
3378                                 if (idev->if_flags & IF_READY)
3379                                         /* device is already configured. */
3380                                         break;
3381                                 idev->if_flags |= IF_READY;
3382                         }
3383
3384                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3385                                 dev->name);
3386
3387                         run_pending = 1;
3388                 }
3389
3390                 switch (dev->type) {
3391 #if IS_ENABLED(CONFIG_IPV6_SIT)
3392                 case ARPHRD_SIT:
3393                         addrconf_sit_config(dev);
3394                         break;
3395 #endif
3396 #if IS_ENABLED(CONFIG_NET_IPGRE)
3397                 case ARPHRD_IPGRE:
3398                         addrconf_gre_config(dev);
3399                         break;
3400 #endif
3401                 case ARPHRD_LOOPBACK:
3402                         init_loopback(dev);
3403                         break;
3404
3405                 default:
3406                         addrconf_dev_config(dev);
3407                         break;
3408                 }
3409
3410                 if (!IS_ERR_OR_NULL(idev)) {
3411                         if (run_pending)
3412                                 addrconf_dad_run(idev);
3413
3414                         /*
3415                          * If the MTU changed during the interface down,
3416                          * when the interface up, the changed MTU must be
3417                          * reflected in the idev as well as routers.
3418                          */
3419                         if (idev->cnf.mtu6 != dev->mtu &&
3420                             dev->mtu >= IPV6_MIN_MTU) {
3421                                 rt6_mtu_change(dev, dev->mtu);
3422                                 idev->cnf.mtu6 = dev->mtu;
3423                         }
3424                         idev->tstamp = jiffies;
3425                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3426
3427                         /*
3428                          * If the changed mtu during down is lower than
3429                          * IPV6_MIN_MTU stop IPv6 on this interface.
3430                          */
3431                         if (dev->mtu < IPV6_MIN_MTU)
3432                                 addrconf_ifdown(dev, 1);
3433                 }
3434                 break;
3435
3436         case NETDEV_DOWN:
3437         case NETDEV_UNREGISTER:
3438                 /*
3439                  *      Remove all addresses from this interface.
3440                  */
3441                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3442                 break;
3443
3444         case NETDEV_CHANGENAME:
3445                 if (idev) {
3446                         snmp6_unregister_dev(idev);
3447                         addrconf_sysctl_unregister(idev);
3448                         err = addrconf_sysctl_register(idev);
3449                         if (err)
3450                                 return notifier_from_errno(err);
3451                         err = snmp6_register_dev(idev);
3452                         if (err) {
3453                                 addrconf_sysctl_unregister(idev);
3454                                 return notifier_from_errno(err);
3455                         }
3456                 }
3457                 break;
3458
3459         case NETDEV_PRE_TYPE_CHANGE:
3460         case NETDEV_POST_TYPE_CHANGE:
3461                 if (idev)
3462                         addrconf_type_change(dev, event);
3463                 break;
3464
3465         case NETDEV_CHANGEUPPER:
3466                 info = ptr;
3467
3468                 /* flush all routes if dev is linked to or unlinked from
3469                  * an L3 master device (e.g., VRF)
3470                  */
3471                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3472                         addrconf_ifdown(dev, 0);
3473         }
3474
3475         return NOTIFY_OK;
3476 }
3477
3478 /*
3479  *      addrconf module should be notified of a device going up
3480  */
3481 static struct notifier_block ipv6_dev_notf = {
3482         .notifier_call = addrconf_notify,
3483 };
3484
3485 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3486 {
3487         struct inet6_dev *idev;
3488         ASSERT_RTNL();
3489
3490         idev = __in6_dev_get(dev);
3491
3492         if (event == NETDEV_POST_TYPE_CHANGE)
3493                 ipv6_mc_remap(idev);
3494         else if (event == NETDEV_PRE_TYPE_CHANGE)
3495                 ipv6_mc_unmap(idev);
3496 }
3497
3498 static bool addr_is_local(const struct in6_addr *addr)
3499 {
3500         return ipv6_addr_type(addr) &
3501                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3502 }
3503
3504 static int addrconf_ifdown(struct net_device *dev, int how)
3505 {
3506         struct net *net = dev_net(dev);
3507         struct inet6_dev *idev;
3508         struct inet6_ifaddr *ifa, *tmp;
3509         struct list_head del_list;
3510         int _keep_addr;
3511         bool keep_addr;
3512         int state, i;
3513
3514         ASSERT_RTNL();
3515
3516         rt6_ifdown(net, dev);
3517         neigh_ifdown(&nd_tbl, dev);
3518
3519         idev = __in6_dev_get(dev);
3520         if (!idev)
3521                 return -ENODEV;
3522
3523         /*
3524          * Step 1: remove reference to ipv6 device from parent device.
3525          *         Do not dev_put!
3526          */
3527         if (how) {
3528                 idev->dead = 1;
3529
3530                 /* protected by rtnl_lock */
3531                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3532
3533                 /* Step 1.5: remove snmp6 entry */
3534                 snmp6_unregister_dev(idev);
3535
3536         }
3537
3538         /* aggregate the system setting and interface setting */
3539         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3540         if (!_keep_addr)
3541                 _keep_addr = idev->cnf.keep_addr_on_down;
3542
3543         /* combine the user config with event to determine if permanent
3544          * addresses are to be removed from address hash table
3545          */
3546         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3547
3548         /* Step 2: clear hash table */
3549         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3550                 struct hlist_head *h = &inet6_addr_lst[i];
3551
3552                 spin_lock_bh(&addrconf_hash_lock);
3553 restart:
3554                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3555                         if (ifa->idev == idev) {
3556                                 addrconf_del_dad_work(ifa);
3557                                 /* combined flag + permanent flag decide if
3558                                  * address is retained on a down event
3559                                  */
3560                                 if (!keep_addr ||
3561                                     !(ifa->flags & IFA_F_PERMANENT) ||
3562                                     addr_is_local(&ifa->addr)) {
3563                                         hlist_del_init_rcu(&ifa->addr_lst);
3564                                         goto restart;
3565                                 }
3566                         }
3567                 }
3568                 spin_unlock_bh(&addrconf_hash_lock);
3569         }
3570
3571         write_lock_bh(&idev->lock);
3572
3573         addrconf_del_rs_timer(idev);
3574
3575         /* Step 2: clear flags for stateless addrconf */
3576         if (!how)
3577                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3578
3579         /* Step 3: clear tempaddr list */
3580         while (!list_empty(&idev->tempaddr_list)) {
3581                 ifa = list_first_entry(&idev->tempaddr_list,
3582                                        struct inet6_ifaddr, tmp_list);
3583                 list_del(&ifa->tmp_list);
3584                 write_unlock_bh(&idev->lock);
3585                 spin_lock_bh(&ifa->lock);
3586
3587                 if (ifa->ifpub) {
3588                         in6_ifa_put(ifa->ifpub);
3589                         ifa->ifpub = NULL;
3590                 }
3591                 spin_unlock_bh(&ifa->lock);
3592                 in6_ifa_put(ifa);
3593                 write_lock_bh(&idev->lock);
3594         }
3595
3596         /* re-combine the user config with event to determine if permanent
3597          * addresses are to be removed from the interface list
3598          */
3599         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3600
3601         INIT_LIST_HEAD(&del_list);
3602         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3603                 struct rt6_info *rt = NULL;
3604
3605                 addrconf_del_dad_work(ifa);
3606
3607                 write_unlock_bh(&idev->lock);
3608                 spin_lock_bh(&ifa->lock);
3609
3610                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3611                     !addr_is_local(&ifa->addr)) {
3612                         /* set state to skip the notifier below */
3613                         state = INET6_IFADDR_STATE_DEAD;
3614                         ifa->state = 0;
3615                         if (!(ifa->flags & IFA_F_NODAD))
3616                                 ifa->flags |= IFA_F_TENTATIVE;
3617
3618                         rt = ifa->rt;
3619                         ifa->rt = NULL;
3620                 } else {
3621                         state = ifa->state;
3622                         ifa->state = INET6_IFADDR_STATE_DEAD;
3623
3624                         list_move(&ifa->if_list, &del_list);
3625                 }
3626
3627                 spin_unlock_bh(&ifa->lock);
3628
3629                 if (rt)
3630                         ip6_del_rt(rt);
3631
3632                 if (state != INET6_IFADDR_STATE_DEAD) {
3633                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3634                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3635                 } else {
3636                         if (idev->cnf.forwarding)
3637                                 addrconf_leave_anycast(ifa);
3638                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3639                 }
3640
3641                 write_lock_bh(&idev->lock);
3642         }
3643
3644         write_unlock_bh(&idev->lock);
3645
3646         /* now clean up addresses to be removed */
3647         while (!list_empty(&del_list)) {
3648                 ifa = list_first_entry(&del_list,
3649                                        struct inet6_ifaddr, if_list);
3650                 list_del(&ifa->if_list);
3651
3652                 in6_ifa_put(ifa);
3653         }
3654
3655         /* Step 5: Discard anycast and multicast list */
3656         if (how) {
3657                 ipv6_ac_destroy_dev(idev);
3658                 ipv6_mc_destroy_dev(idev);
3659         } else {
3660                 ipv6_mc_down(idev);
3661         }
3662
3663         idev->tstamp = jiffies;
3664
3665         /* Last: Shot the device (if unregistered) */
3666         if (how) {
3667                 addrconf_sysctl_unregister(idev);
3668                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3669                 neigh_ifdown(&nd_tbl, dev);
3670                 in6_dev_put(idev);
3671         }
3672         return 0;
3673 }
3674
3675 static void addrconf_rs_timer(unsigned long data)
3676 {
3677         struct inet6_dev *idev = (struct inet6_dev *)data;
3678         struct net_device *dev = idev->dev;
3679         struct in6_addr lladdr;
3680
3681         write_lock(&idev->lock);
3682         if (idev->dead || !(idev->if_flags & IF_READY))
3683                 goto out;
3684
3685         if (!ipv6_accept_ra(idev))
3686                 goto out;
3687
3688         /* Announcement received after solicitation was sent */
3689         if (idev->if_flags & IF_RA_RCVD)
3690                 goto out;
3691
3692         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3693                 write_unlock(&idev->lock);
3694                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3695                         ndisc_send_rs(dev, &lladdr,
3696                                       &in6addr_linklocal_allrouters);
3697                 else
3698                         goto put;
3699
3700                 write_lock(&idev->lock);
3701                 idev->rs_interval = rfc3315_s14_backoff_update(
3702                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3703                 /* The wait after the last probe can be shorter */
3704                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3705                                              idev->cnf.rtr_solicits) ?
3706                                       idev->cnf.rtr_solicit_delay :
3707                                       idev->rs_interval);
3708         } else {
3709                 /*
3710                  * Note: we do not support deprecated "all on-link"
3711                  * assumption any longer.
3712                  */
3713                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3714         }
3715
3716 out:
3717         write_unlock(&idev->lock);
3718 put:
3719         in6_dev_put(idev);
3720 }
3721
3722 /*
3723  *      Duplicate Address Detection
3724  */
3725 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3726 {
3727         unsigned long rand_num;
3728         struct inet6_dev *idev = ifp->idev;
3729
3730         if (ifp->flags & IFA_F_OPTIMISTIC)
3731                 rand_num = 0;
3732         else
3733                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3734
3735         ifp->dad_probes = idev->cnf.dad_transmits;
3736         addrconf_mod_dad_work(ifp, rand_num);
3737 }
3738
3739 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3740 {
3741         struct inet6_dev *idev = ifp->idev;
3742         struct net_device *dev = idev->dev;
3743         bool notify = false;
3744
3745         addrconf_join_solict(dev, &ifp->addr);
3746
3747         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3748
3749         read_lock_bh(&idev->lock);
3750         spin_lock(&ifp->lock);
3751         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3752                 goto out;
3753
3754         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3755             idev->cnf.accept_dad < 1 ||
3756             !(ifp->flags&IFA_F_TENTATIVE) ||
3757             ifp->flags & IFA_F_NODAD) {
3758                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3759                 spin_unlock(&ifp->lock);
3760                 read_unlock_bh(&idev->lock);
3761
3762                 addrconf_dad_completed(ifp);
3763                 return;
3764         }
3765
3766         if (!(idev->if_flags & IF_READY)) {
3767                 spin_unlock(&ifp->lock);
3768                 read_unlock_bh(&idev->lock);
3769                 /*
3770                  * If the device is not ready:
3771                  * - keep it tentative if it is a permanent address.
3772                  * - otherwise, kill it.
3773                  */
3774                 in6_ifa_hold(ifp);
3775                 addrconf_dad_stop(ifp, 0);
3776                 return;
3777         }
3778
3779         /*
3780          * Optimistic nodes can start receiving
3781          * Frames right away
3782          */
3783         if (ifp->flags & IFA_F_OPTIMISTIC) {
3784                 ip6_ins_rt(ifp->rt);
3785                 if (ipv6_use_optimistic_addr(idev)) {
3786                         /* Because optimistic nodes can use this address,
3787                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3788                          */
3789                         notify = true;
3790                 }
3791         }
3792
3793         addrconf_dad_kick(ifp);
3794 out:
3795         spin_unlock(&ifp->lock);
3796         read_unlock_bh(&idev->lock);
3797         if (notify)
3798                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3799 }
3800
3801 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3802 {
3803         bool begin_dad = false;
3804
3805         spin_lock_bh(&ifp->lock);
3806         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3807                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3808                 begin_dad = true;
3809         }
3810         spin_unlock_bh(&ifp->lock);
3811
3812         if (begin_dad)
3813                 addrconf_mod_dad_work(ifp, 0);
3814 }
3815
3816 static void addrconf_dad_work(struct work_struct *w)
3817 {
3818         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3819                                                 struct inet6_ifaddr,
3820                                                 dad_work);
3821         struct inet6_dev *idev = ifp->idev;
3822         struct in6_addr mcaddr;
3823         bool disable_ipv6 = false;
3824
3825         enum {
3826                 DAD_PROCESS,
3827                 DAD_BEGIN,
3828                 DAD_ABORT,
3829         } action = DAD_PROCESS;
3830
3831         rtnl_lock();
3832
3833         spin_lock_bh(&ifp->lock);
3834         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3835                 action = DAD_BEGIN;
3836                 ifp->state = INET6_IFADDR_STATE_DAD;
3837         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3838                 action = DAD_ABORT;
3839                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3840
3841                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3842                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3843                         struct in6_addr addr;
3844
3845                         addr.s6_addr32[0] = htonl(0xfe800000);
3846                         addr.s6_addr32[1] = 0;
3847
3848                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3849                             ipv6_addr_equal(&ifp->addr, &addr)) {
3850                                 /* DAD failed for link-local based on MAC */
3851                                 idev->cnf.disable_ipv6 = 1;
3852
3853                                 pr_info("%s: IPv6 being disabled!\n",
3854                                         ifp->idev->dev->name);
3855                                 disable_ipv6 = true;
3856                         }
3857                 }
3858         }
3859         spin_unlock_bh(&ifp->lock);
3860
3861         if (action == DAD_BEGIN) {
3862                 addrconf_dad_begin(ifp);
3863                 goto out;
3864         } else if (action == DAD_ABORT) {
3865                 in6_ifa_hold(ifp);
3866                 addrconf_dad_stop(ifp, 1);
3867                 if (disable_ipv6)
3868                         addrconf_ifdown(idev->dev, 0);
3869                 goto out;
3870         }
3871
3872         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3873                 goto out;
3874
3875         write_lock_bh(&idev->lock);
3876         if (idev->dead || !(idev->if_flags & IF_READY)) {
3877                 write_unlock_bh(&idev->lock);
3878                 goto out;
3879         }
3880
3881         spin_lock(&ifp->lock);
3882         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3883                 spin_unlock(&ifp->lock);
3884                 write_unlock_bh(&idev->lock);
3885                 goto out;
3886         }
3887
3888         if (ifp->dad_probes == 0) {
3889                 /*
3890                  * DAD was successful
3891                  */
3892
3893                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3894                 spin_unlock(&ifp->lock);
3895                 write_unlock_bh(&idev->lock);
3896
3897                 addrconf_dad_completed(ifp);
3898
3899                 goto out;
3900         }
3901
3902         ifp->dad_probes--;
3903         addrconf_mod_dad_work(ifp,
3904                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3905         spin_unlock(&ifp->lock);
3906         write_unlock_bh(&idev->lock);
3907
3908         /* send a neighbour solicitation for our addr */
3909         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3910         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3911 out:
3912         in6_ifa_put(ifp);
3913         rtnl_unlock();
3914 }
3915
3916 /* ifp->idev must be at least read locked */
3917 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3918 {
3919         struct inet6_ifaddr *ifpiter;
3920         struct inet6_dev *idev = ifp->idev;
3921
3922         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3923                 if (ifpiter->scope > IFA_LINK)
3924                         break;
3925                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3926                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3927                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3928                     IFA_F_PERMANENT)
3929                         return false;
3930         }
3931         return true;
3932 }
3933
3934 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3935 {
3936         struct net_device *dev = ifp->idev->dev;
3937         struct in6_addr lladdr;
3938         bool send_rs, send_mld;
3939
3940         addrconf_del_dad_work(ifp);
3941
3942         /*
3943          *      Configure the address for reception. Now it is valid.
3944          */
3945
3946         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3947
3948         /* If added prefix is link local and we are prepared to process
3949            router advertisements, start sending router solicitations.
3950          */
3951
3952         read_lock_bh(&ifp->idev->lock);
3953         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3954         send_rs = send_mld &&
3955                   ipv6_accept_ra(ifp->idev) &&
3956                   ifp->idev->cnf.rtr_solicits != 0 &&
3957                   (dev->flags&IFF_LOOPBACK) == 0;
3958         read_unlock_bh(&ifp->idev->lock);
3959
3960         /* While dad is in progress mld report's source address is in6_addrany.
3961          * Resend with proper ll now.
3962          */
3963         if (send_mld)
3964                 ipv6_mc_dad_complete(ifp->idev);
3965
3966         if (send_rs) {
3967                 /*
3968                  *      If a host as already performed a random delay
3969                  *      [...] as part of DAD [...] there is no need
3970                  *      to delay again before sending the first RS
3971                  */
3972                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3973                         return;
3974                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3975
3976                 write_lock_bh(&ifp->idev->lock);
3977                 spin_lock(&ifp->lock);
3978                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
3979                         ifp->idev->cnf.rtr_solicit_interval);
3980                 ifp->idev->rs_probes = 1;
3981                 ifp->idev->if_flags |= IF_RS_SENT;
3982                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
3983                 spin_unlock(&ifp->lock);
3984                 write_unlock_bh(&ifp->idev->lock);
3985         }
3986 }
3987
3988 static void addrconf_dad_run(struct inet6_dev *idev)
3989 {
3990         struct inet6_ifaddr *ifp;
3991
3992         read_lock_bh(&idev->lock);
3993         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3994                 spin_lock(&ifp->lock);
3995                 if (ifp->flags & IFA_F_TENTATIVE &&
3996                     ifp->state == INET6_IFADDR_STATE_DAD)
3997                         addrconf_dad_kick(ifp);
3998                 spin_unlock(&ifp->lock);
3999         }
4000         read_unlock_bh(&idev->lock);
4001 }
4002
4003 #ifdef CONFIG_PROC_FS
4004 struct if6_iter_state {
4005         struct seq_net_private p;
4006         int bucket;
4007         int offset;
4008 };
4009
4010 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4011 {
4012         struct inet6_ifaddr *ifa = NULL;
4013         struct if6_iter_state *state = seq->private;
4014         struct net *net = seq_file_net(seq);
4015         int p = 0;
4016
4017         /* initial bucket if pos is 0 */
4018         if (pos == 0) {
4019                 state->bucket = 0;
4020                 state->offset = 0;
4021         }
4022
4023         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4024                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4025                                          addr_lst) {
4026                         if (!net_eq(dev_net(ifa->idev->dev), net))
4027                                 continue;
4028                         /* sync with offset */
4029                         if (p < state->offset) {
4030                                 p++;
4031                                 continue;
4032                         }
4033                         state->offset++;
4034                         return ifa;
4035                 }
4036
4037                 /* prepare for next bucket */
4038                 state->offset = 0;
4039                 p = 0;
4040         }
4041         return NULL;
4042 }
4043
4044 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4045                                          struct inet6_ifaddr *ifa)
4046 {
4047         struct if6_iter_state *state = seq->private;
4048         struct net *net = seq_file_net(seq);
4049
4050         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4051                 if (!net_eq(dev_net(ifa->idev->dev), net))
4052                         continue;
4053                 state->offset++;
4054                 return ifa;
4055         }
4056
4057         while (++state->bucket < IN6_ADDR_HSIZE) {
4058                 state->offset = 0;
4059                 hlist_for_each_entry_rcu_bh(ifa,
4060                                      &inet6_addr_lst[state->bucket], addr_lst) {
4061                         if (!net_eq(dev_net(ifa->idev->dev), net))
4062                                 continue;
4063                         state->offset++;
4064                         return ifa;
4065                 }
4066         }
4067
4068         return NULL;
4069 }
4070
4071 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4072         __acquires(rcu_bh)
4073 {
4074         rcu_read_lock_bh();
4075         return if6_get_first(seq, *pos);
4076 }
4077
4078 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4079 {
4080         struct inet6_ifaddr *ifa;
4081
4082         ifa = if6_get_next(seq, v);
4083         ++*pos;
4084         return ifa;
4085 }
4086
4087 static void if6_seq_stop(struct seq_file *seq, void *v)
4088         __releases(rcu_bh)
4089 {
4090         rcu_read_unlock_bh();
4091 }
4092
4093 static int if6_seq_show(struct seq_file *seq, void *v)
4094 {
4095         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4096         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4097                    &ifp->addr,
4098                    ifp->idev->dev->ifindex,
4099                    ifp->prefix_len,
4100                    ifp->scope,
4101                    (u8) ifp->flags,
4102                    ifp->idev->dev->name);
4103         return 0;
4104 }
4105
4106 static const struct seq_operations if6_seq_ops = {
4107         .start  = if6_seq_start,
4108         .next   = if6_seq_next,
4109         .show   = if6_seq_show,
4110         .stop   = if6_seq_stop,
4111 };
4112
4113 static int if6_seq_open(struct inode *inode, struct file *file)
4114 {
4115         return seq_open_net(inode, file, &if6_seq_ops,
4116                             sizeof(struct if6_iter_state));
4117 }
4118
4119 static const struct file_operations if6_fops = {
4120         .owner          = THIS_MODULE,
4121         .open           = if6_seq_open,
4122         .read           = seq_read,
4123         .llseek         = seq_lseek,
4124         .release        = seq_release_net,
4125 };
4126
4127 static int __net_init if6_proc_net_init(struct net *net)
4128 {
4129         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4130                 return -ENOMEM;
4131         return 0;
4132 }
4133
4134 static void __net_exit if6_proc_net_exit(struct net *net)
4135 {
4136         remove_proc_entry("if_inet6", net->proc_net);
4137 }
4138
4139 static struct pernet_operations if6_proc_net_ops = {
4140         .init = if6_proc_net_init,
4141         .exit = if6_proc_net_exit,
4142 };
4143
4144 int __init if6_proc_init(void)
4145 {
4146         return register_pernet_subsys(&if6_proc_net_ops);
4147 }
4148
4149 void if6_proc_exit(void)
4150 {
4151         unregister_pernet_subsys(&if6_proc_net_ops);
4152 }
4153 #endif  /* CONFIG_PROC_FS */
4154
4155 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4156 /* Check if address is a home address configured on any interface. */
4157 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4158 {
4159         int ret = 0;
4160         struct inet6_ifaddr *ifp = NULL;
4161         unsigned int hash = inet6_addr_hash(addr);
4162
4163         rcu_read_lock_bh();
4164         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4165                 if (!net_eq(dev_net(ifp->idev->dev), net))
4166                         continue;
4167                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4168                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4169                         ret = 1;
4170                         break;
4171                 }
4172         }
4173         rcu_read_unlock_bh();
4174         return ret;
4175 }
4176 #endif
4177
4178 /*
4179  *      Periodic address status verification
4180  */
4181
4182 static void addrconf_verify_rtnl(void)
4183 {
4184         unsigned long now, next, next_sec, next_sched;
4185         struct inet6_ifaddr *ifp;
4186         int i;
4187
4188         ASSERT_RTNL();
4189
4190         rcu_read_lock_bh();
4191         now = jiffies;
4192         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4193
4194         cancel_delayed_work(&addr_chk_work);
4195
4196         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4197 restart:
4198                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4199                         unsigned long age;
4200
4201                         /* When setting preferred_lft to a value not zero or
4202                          * infinity, while valid_lft is infinity
4203                          * IFA_F_PERMANENT has a non-infinity life time.
4204                          */
4205                         if ((ifp->flags & IFA_F_PERMANENT) &&
4206                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4207                                 continue;
4208
4209                         spin_lock(&ifp->lock);
4210                         /* We try to batch several events at once. */
4211                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4212
4213                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4214                             age >= ifp->valid_lft) {
4215                                 spin_unlock(&ifp->lock);
4216                                 in6_ifa_hold(ifp);
4217                                 ipv6_del_addr(ifp);
4218                                 goto restart;
4219                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4220                                 spin_unlock(&ifp->lock);
4221                                 continue;
4222                         } else if (age >= ifp->prefered_lft) {
4223                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4224                                 int deprecate = 0;
4225
4226                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4227                                         deprecate = 1;
4228                                         ifp->flags |= IFA_F_DEPRECATED;
4229                                 }
4230
4231                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4232                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4233                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4234
4235                                 spin_unlock(&ifp->lock);
4236
4237                                 if (deprecate) {
4238                                         in6_ifa_hold(ifp);
4239
4240                                         ipv6_ifa_notify(0, ifp);
4241                                         in6_ifa_put(ifp);
4242                                         goto restart;
4243                                 }
4244                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4245                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4246                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4247                                         ifp->idev->cnf.dad_transmits *
4248                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4249
4250                                 if (age >= ifp->prefered_lft - regen_advance) {
4251                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4252                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4253                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4254                                         if (!ifp->regen_count && ifpub) {
4255                                                 ifp->regen_count++;
4256                                                 in6_ifa_hold(ifp);
4257                                                 in6_ifa_hold(ifpub);
4258                                                 spin_unlock(&ifp->lock);
4259
4260                                                 spin_lock(&ifpub->lock);
4261                                                 ifpub->regen_count = 0;
4262                                                 spin_unlock(&ifpub->lock);
4263                                                 ipv6_create_tempaddr(ifpub, ifp);
4264                                                 in6_ifa_put(ifpub);
4265                                                 in6_ifa_put(ifp);
4266                                                 goto restart;
4267                                         }
4268                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4269                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4270                                 spin_unlock(&ifp->lock);
4271                         } else {
4272                                 /* ifp->prefered_lft <= ifp->valid_lft */
4273                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4274                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4275                                 spin_unlock(&ifp->lock);
4276                         }
4277                 }
4278         }
4279
4280         next_sec = round_jiffies_up(next);
4281         next_sched = next;
4282
4283         /* If rounded timeout is accurate enough, accept it. */
4284         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4285                 next_sched = next_sec;
4286
4287         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4288         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4289                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4290
4291         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4292               now, next, next_sec, next_sched);
4293         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4294         rcu_read_unlock_bh();
4295 }
4296
4297 static void addrconf_verify_work(struct work_struct *w)
4298 {
4299         rtnl_lock();
4300         addrconf_verify_rtnl();
4301         rtnl_unlock();
4302 }
4303
4304 static void addrconf_verify(void)
4305 {
4306         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4307 }
4308
4309 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4310                                      struct in6_addr **peer_pfx)
4311 {
4312         struct in6_addr *pfx = NULL;
4313
4314         *peer_pfx = NULL;
4315
4316         if (addr)
4317                 pfx = nla_data(addr);
4318
4319         if (local) {
4320                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4321                         *peer_pfx = pfx;
4322                 pfx = nla_data(local);
4323         }
4324
4325         return pfx;
4326 }
4327
4328 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4329         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4330         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4331         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4332         [IFA_FLAGS]             = { .len = sizeof(u32) },
4333 };
4334
4335 static int
4336 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4337 {
4338         struct net *net = sock_net(skb->sk);
4339         struct ifaddrmsg *ifm;
4340         struct nlattr *tb[IFA_MAX+1];
4341         struct in6_addr *pfx, *peer_pfx;
4342         u32 ifa_flags;
4343         int err;
4344
4345         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4346         if (err < 0)
4347                 return err;
4348
4349         ifm = nlmsg_data(nlh);
4350         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4351         if (!pfx)
4352                 return -EINVAL;
4353
4354         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4355
4356         /* We ignore other flags so far. */
4357         ifa_flags &= IFA_F_MANAGETEMPADDR;
4358
4359         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4360                               ifm->ifa_prefixlen);
4361 }
4362
4363 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4364                              u32 prefered_lft, u32 valid_lft)
4365 {
4366         u32 flags;
4367         clock_t expires;
4368         unsigned long timeout;
4369         bool was_managetempaddr;
4370         bool had_prefixroute;
4371
4372         ASSERT_RTNL();
4373
4374         if (!valid_lft || (prefered_lft > valid_lft))
4375                 return -EINVAL;
4376
4377         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4378             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4379                 return -EINVAL;
4380
4381         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4382         if (addrconf_finite_timeout(timeout)) {
4383                 expires = jiffies_to_clock_t(timeout * HZ);
4384                 valid_lft = timeout;
4385                 flags = RTF_EXPIRES;
4386         } else {
4387                 expires = 0;
4388                 flags = 0;
4389                 ifa_flags |= IFA_F_PERMANENT;
4390         }
4391
4392         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4393         if (addrconf_finite_timeout(timeout)) {
4394                 if (timeout == 0)
4395                         ifa_flags |= IFA_F_DEPRECATED;
4396                 prefered_lft = timeout;
4397         }
4398
4399         spin_lock_bh(&ifp->lock);
4400         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4401         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4402                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4403         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4404                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4405                         IFA_F_NOPREFIXROUTE);
4406         ifp->flags |= ifa_flags;
4407         ifp->tstamp = jiffies;
4408         ifp->valid_lft = valid_lft;
4409         ifp->prefered_lft = prefered_lft;
4410
4411         spin_unlock_bh(&ifp->lock);
4412         if (!(ifp->flags&IFA_F_TENTATIVE))
4413                 ipv6_ifa_notify(0, ifp);
4414
4415         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4416                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4417                                       expires, flags);
4418         } else if (had_prefixroute) {
4419                 enum cleanup_prefix_rt_t action;
4420                 unsigned long rt_expires;
4421
4422                 write_lock_bh(&ifp->idev->lock);
4423                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4424                 write_unlock_bh(&ifp->idev->lock);
4425
4426                 if (action != CLEANUP_PREFIX_RT_NOP) {
4427                         cleanup_prefix_route(ifp, rt_expires,
4428                                 action == CLEANUP_PREFIX_RT_DEL);
4429                 }
4430         }
4431
4432         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4433                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4434                         valid_lft = prefered_lft = 0;
4435                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4436                                  !was_managetempaddr, jiffies);
4437         }
4438
4439         addrconf_verify_rtnl();
4440
4441         return 0;
4442 }
4443
4444 static int
4445 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4446 {
4447         struct net *net = sock_net(skb->sk);
4448         struct ifaddrmsg *ifm;
4449         struct nlattr *tb[IFA_MAX+1];
4450         struct in6_addr *pfx, *peer_pfx;
4451         struct inet6_ifaddr *ifa;
4452         struct net_device *dev;
4453         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4454         u32 ifa_flags;
4455         int err;
4456
4457         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4458         if (err < 0)
4459                 return err;
4460
4461         ifm = nlmsg_data(nlh);
4462         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4463         if (!pfx)
4464                 return -EINVAL;
4465
4466         if (tb[IFA_CACHEINFO]) {
4467                 struct ifa_cacheinfo *ci;
4468
4469                 ci = nla_data(tb[IFA_CACHEINFO]);
4470                 valid_lft = ci->ifa_valid;
4471                 preferred_lft = ci->ifa_prefered;
4472         } else {
4473                 preferred_lft = INFINITY_LIFE_TIME;
4474                 valid_lft = INFINITY_LIFE_TIME;
4475         }
4476
4477         dev =  __dev_get_by_index(net, ifm->ifa_index);
4478         if (!dev)
4479                 return -ENODEV;
4480
4481         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4482
4483         /* We ignore other flags so far. */
4484         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4485                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4486
4487         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4488         if (!ifa) {
4489                 /*
4490                  * It would be best to check for !NLM_F_CREATE here but
4491                  * userspace already relies on not having to provide this.
4492                  */
4493                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4494                                       ifm->ifa_prefixlen, ifa_flags,
4495                                       preferred_lft, valid_lft);
4496         }
4497
4498         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4499             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4500                 err = -EEXIST;
4501         else
4502                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4503
4504         in6_ifa_put(ifa);
4505
4506         return err;
4507 }
4508
4509 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4510                           u8 scope, int ifindex)
4511 {
4512         struct ifaddrmsg *ifm;
4513
4514         ifm = nlmsg_data(nlh);
4515         ifm->ifa_family = AF_INET6;
4516         ifm->ifa_prefixlen = prefixlen;
4517         ifm->ifa_flags = flags;
4518         ifm->ifa_scope = scope;
4519         ifm->ifa_index = ifindex;
4520 }
4521
4522 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4523                          unsigned long tstamp, u32 preferred, u32 valid)
4524 {
4525         struct ifa_cacheinfo ci;
4526
4527         ci.cstamp = cstamp_delta(cstamp);
4528         ci.tstamp = cstamp_delta(tstamp);
4529         ci.ifa_prefered = preferred;
4530         ci.ifa_valid = valid;
4531
4532         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4533 }
4534
4535 static inline int rt_scope(int ifa_scope)
4536 {
4537         if (ifa_scope & IFA_HOST)
4538                 return RT_SCOPE_HOST;
4539         else if (ifa_scope & IFA_LINK)
4540                 return RT_SCOPE_LINK;
4541         else if (ifa_scope & IFA_SITE)
4542                 return RT_SCOPE_SITE;
4543         else
4544                 return RT_SCOPE_UNIVERSE;
4545 }
4546
4547 static inline int inet6_ifaddr_msgsize(void)
4548 {
4549         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4550                + nla_total_size(16) /* IFA_LOCAL */
4551                + nla_total_size(16) /* IFA_ADDRESS */
4552                + nla_total_size(sizeof(struct ifa_cacheinfo))
4553                + nla_total_size(4)  /* IFA_FLAGS */;
4554 }
4555
4556 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4557                              u32 portid, u32 seq, int event, unsigned int flags)
4558 {
4559         struct nlmsghdr  *nlh;
4560         u32 preferred, valid;
4561
4562         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4563         if (!nlh)
4564                 return -EMSGSIZE;
4565
4566         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4567                       ifa->idev->dev->ifindex);
4568
4569         if (!((ifa->flags&IFA_F_PERMANENT) &&
4570               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4571                 preferred = ifa->prefered_lft;
4572                 valid = ifa->valid_lft;
4573                 if (preferred != INFINITY_LIFE_TIME) {
4574                         long tval = (jiffies - ifa->tstamp)/HZ;
4575                         if (preferred > tval)
4576                                 preferred -= tval;
4577                         else
4578                                 preferred = 0;
4579                         if (valid != INFINITY_LIFE_TIME) {
4580                                 if (valid > tval)
4581                                         valid -= tval;
4582                                 else
4583                                         valid = 0;
4584                         }
4585                 }
4586         } else {
4587                 preferred = INFINITY_LIFE_TIME;
4588                 valid = INFINITY_LIFE_TIME;
4589         }
4590
4591         if (!ipv6_addr_any(&ifa->peer_addr)) {
4592                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4593                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4594                         goto error;
4595         } else
4596                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4597                         goto error;
4598
4599         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4600                 goto error;
4601
4602         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4603                 goto error;
4604
4605         nlmsg_end(skb, nlh);
4606         return 0;
4607
4608 error:
4609         nlmsg_cancel(skb, nlh);
4610         return -EMSGSIZE;
4611 }
4612
4613 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4614                                 u32 portid, u32 seq, int event, u16 flags)
4615 {
4616         struct nlmsghdr  *nlh;
4617         u8 scope = RT_SCOPE_UNIVERSE;
4618         int ifindex = ifmca->idev->dev->ifindex;
4619
4620         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4621                 scope = RT_SCOPE_SITE;
4622
4623         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4624         if (!nlh)
4625                 return -EMSGSIZE;
4626
4627         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4628         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4629             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4630                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4631                 nlmsg_cancel(skb, nlh);
4632                 return -EMSGSIZE;
4633         }
4634
4635         nlmsg_end(skb, nlh);
4636         return 0;
4637 }
4638
4639 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4640                                 u32 portid, u32 seq, int event, unsigned int flags)
4641 {
4642         struct nlmsghdr  *nlh;
4643         u8 scope = RT_SCOPE_UNIVERSE;
4644         int ifindex = ifaca->aca_idev->dev->ifindex;
4645
4646         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4647                 scope = RT_SCOPE_SITE;
4648
4649         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4650         if (!nlh)
4651                 return -EMSGSIZE;
4652
4653         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4654         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4655             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4656                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4657                 nlmsg_cancel(skb, nlh);
4658                 return -EMSGSIZE;
4659         }
4660
4661         nlmsg_end(skb, nlh);
4662         return 0;
4663 }
4664
4665 enum addr_type_t {
4666         UNICAST_ADDR,
4667         MULTICAST_ADDR,
4668         ANYCAST_ADDR,
4669 };
4670
4671 /* called with rcu_read_lock() */
4672 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4673                           struct netlink_callback *cb, enum addr_type_t type,
4674                           int s_ip_idx, int *p_ip_idx)
4675 {
4676         struct ifmcaddr6 *ifmca;
4677         struct ifacaddr6 *ifaca;
4678         int err = 1;
4679         int ip_idx = *p_ip_idx;
4680
4681         read_lock_bh(&idev->lock);
4682         switch (type) {
4683         case UNICAST_ADDR: {
4684                 struct inet6_ifaddr *ifa;
4685
4686                 /* unicast address incl. temp addr */
4687                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4688                         if (++ip_idx < s_ip_idx)
4689                                 continue;
4690                         err = inet6_fill_ifaddr(skb, ifa,
4691                                                 NETLINK_CB(cb->skb).portid,
4692                                                 cb->nlh->nlmsg_seq,
4693                                                 RTM_NEWADDR,
4694                                                 NLM_F_MULTI);
4695                         if (err < 0)
4696                                 break;
4697                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4698                 }
4699                 break;
4700         }
4701         case MULTICAST_ADDR:
4702                 /* multicast address */
4703                 for (ifmca = idev->mc_list; ifmca;
4704                      ifmca = ifmca->next, ip_idx++) {
4705                         if (ip_idx < s_ip_idx)
4706                                 continue;
4707                         err = inet6_fill_ifmcaddr(skb, ifmca,
4708                                                   NETLINK_CB(cb->skb).portid,
4709                                                   cb->nlh->nlmsg_seq,
4710                                                   RTM_GETMULTICAST,
4711                                                   NLM_F_MULTI);
4712                         if (err < 0)
4713                                 break;
4714                 }
4715                 break;
4716         case ANYCAST_ADDR:
4717                 /* anycast address */
4718                 for (ifaca = idev->ac_list; ifaca;
4719                      ifaca = ifaca->aca_next, ip_idx++) {
4720                         if (ip_idx < s_ip_idx)
4721                                 continue;
4722                         err = inet6_fill_ifacaddr(skb, ifaca,
4723                                                   NETLINK_CB(cb->skb).portid,
4724                                                   cb->nlh->nlmsg_seq,
4725                                                   RTM_GETANYCAST,
4726                                                   NLM_F_MULTI);
4727                         if (err < 0)
4728                                 break;
4729                 }
4730                 break;
4731         default:
4732                 break;
4733         }
4734         read_unlock_bh(&idev->lock);
4735         *p_ip_idx = ip_idx;
4736         return err;
4737 }
4738
4739 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4740                            enum addr_type_t type)
4741 {
4742         struct net *net = sock_net(skb->sk);
4743         int h, s_h;
4744         int idx, ip_idx;
4745         int s_idx, s_ip_idx;
4746         struct net_device *dev;
4747         struct inet6_dev *idev;
4748         struct hlist_head *head;
4749
4750         s_h = cb->args[0];
4751         s_idx = idx = cb->args[1];
4752         s_ip_idx = ip_idx = cb->args[2];
4753
4754         rcu_read_lock();
4755         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4756         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4757                 idx = 0;
4758                 head = &net->dev_index_head[h];
4759                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4760                         if (idx < s_idx)
4761                                 goto cont;
4762                         if (h > s_h || idx > s_idx)
4763                                 s_ip_idx = 0;
4764                         ip_idx = 0;
4765                         idev = __in6_dev_get(dev);
4766                         if (!idev)
4767                                 goto cont;
4768
4769                         if (in6_dump_addrs(idev, skb, cb, type,
4770                                            s_ip_idx, &ip_idx) < 0)
4771                                 goto done;
4772 cont:
4773                         idx++;
4774                 }
4775         }
4776 done:
4777         rcu_read_unlock();
4778         cb->args[0] = h;
4779         cb->args[1] = idx;
4780         cb->args[2] = ip_idx;
4781
4782         return skb->len;
4783 }
4784
4785 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4786 {
4787         enum addr_type_t type = UNICAST_ADDR;
4788
4789         return inet6_dump_addr(skb, cb, type);
4790 }
4791
4792 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4793 {
4794         enum addr_type_t type = MULTICAST_ADDR;
4795
4796         return inet6_dump_addr(skb, cb, type);
4797 }
4798
4799
4800 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4801 {
4802         enum addr_type_t type = ANYCAST_ADDR;
4803
4804         return inet6_dump_addr(skb, cb, type);
4805 }
4806
4807 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4808 {
4809         struct net *net = sock_net(in_skb->sk);
4810         struct ifaddrmsg *ifm;
4811         struct nlattr *tb[IFA_MAX+1];
4812         struct in6_addr *addr = NULL, *peer;
4813         struct net_device *dev = NULL;
4814         struct inet6_ifaddr *ifa;
4815         struct sk_buff *skb;
4816         int err;
4817
4818         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4819         if (err < 0)
4820                 goto errout;
4821
4822         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4823         if (!addr) {
4824                 err = -EINVAL;
4825                 goto errout;
4826         }
4827
4828         ifm = nlmsg_data(nlh);
4829         if (ifm->ifa_index)
4830                 dev = __dev_get_by_index(net, ifm->ifa_index);
4831
4832         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4833         if (!ifa) {
4834                 err = -EADDRNOTAVAIL;
4835                 goto errout;
4836         }
4837
4838         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4839         if (!skb) {
4840                 err = -ENOBUFS;
4841                 goto errout_ifa;
4842         }
4843
4844         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4845                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4846         if (err < 0) {
4847                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4848                 WARN_ON(err == -EMSGSIZE);
4849                 kfree_skb(skb);
4850                 goto errout_ifa;
4851         }
4852         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4853 errout_ifa:
4854         in6_ifa_put(ifa);
4855 errout:
4856         return err;
4857 }
4858
4859 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4860 {
4861         struct sk_buff *skb;
4862         struct net *net = dev_net(ifa->idev->dev);
4863         int err = -ENOBUFS;
4864
4865         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4866         if (!skb)
4867                 goto errout;
4868
4869         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4870         if (err < 0) {
4871                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4872                 WARN_ON(err == -EMSGSIZE);
4873                 kfree_skb(skb);
4874                 goto errout;
4875         }
4876         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4877         return;
4878 errout:
4879         if (err < 0)
4880                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4881 }
4882
4883 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4884                                 __s32 *array, int bytes)
4885 {
4886         BUG_ON(bytes < (DEVCONF_MAX * 4));
4887
4888         memset(array, 0, bytes);
4889         array[DEVCONF_FORWARDING] = cnf->forwarding;
4890         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4891         array[DEVCONF_MTU6] = cnf->mtu6;
4892         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4893         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4894         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4895         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4896         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4897         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4898                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4899         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4900                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4901         array[DEVCONF_RTR_SOLICIT_DELAY] =
4902                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4903         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4904         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4905                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4906         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4907                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4908         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4909         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4910         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4911         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4912         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4913         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4914         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4915         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4916         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4917 #ifdef CONFIG_IPV6_ROUTER_PREF
4918         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4919         array[DEVCONF_RTR_PROBE_INTERVAL] =
4920                 jiffies_to_msecs(cnf->rtr_probe_interval);
4921 #ifdef CONFIG_IPV6_ROUTE_INFO
4922         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4923 #endif
4924 #endif
4925         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4926         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4927 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4928         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4929         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4930 #endif
4931 #ifdef CONFIG_IPV6_MROUTE
4932         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4933 #endif
4934         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4935         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4936         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4937         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4938         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4939         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4940         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4941         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4942         /* we omit DEVCONF_STABLE_SECRET for now */
4943         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4944         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4945         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4946         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4947 }
4948
4949 static inline size_t inet6_ifla6_size(void)
4950 {
4951         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4952              + nla_total_size(sizeof(struct ifla_cacheinfo))
4953              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4954              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4955              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4956              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4957 }
4958
4959 static inline size_t inet6_if_nlmsg_size(void)
4960 {
4961         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4962                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4963                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4964                + nla_total_size(4) /* IFLA_MTU */
4965                + nla_total_size(4) /* IFLA_LINK */
4966                + nla_total_size(1) /* IFLA_OPERSTATE */
4967                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4968 }
4969
4970 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4971                                         int bytes)
4972 {
4973         int i;
4974         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
4975         BUG_ON(pad < 0);
4976
4977         /* Use put_unaligned() because stats may not be aligned for u64. */
4978         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
4979         for (i = 1; i < ICMP6_MIB_MAX; i++)
4980                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4981
4982         memset(&stats[ICMP6_MIB_MAX], 0, pad);
4983 }
4984
4985 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4986                                         int bytes, size_t syncpoff)
4987 {
4988         int i, c;
4989         u64 buff[IPSTATS_MIB_MAX];
4990         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4991
4992         BUG_ON(pad < 0);
4993
4994         memset(buff, 0, sizeof(buff));
4995         buff[0] = IPSTATS_MIB_MAX;
4996
4997         for_each_possible_cpu(c) {
4998                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4999                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5000         }
5001
5002         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5003         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5004 }
5005
5006 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5007                              int bytes)
5008 {
5009         switch (attrtype) {
5010         case IFLA_INET6_STATS:
5011                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5012                                      offsetof(struct ipstats_mib, syncp));
5013                 break;
5014         case IFLA_INET6_ICMP6STATS:
5015                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5016                 break;
5017         }
5018 }
5019
5020 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5021                                   u32 ext_filter_mask)
5022 {
5023         struct nlattr *nla;
5024         struct ifla_cacheinfo ci;
5025
5026         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5027                 goto nla_put_failure;
5028         ci.max_reasm_len = IPV6_MAXPLEN;
5029         ci.tstamp = cstamp_delta(idev->tstamp);
5030         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5031         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5032         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5033                 goto nla_put_failure;
5034         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5035         if (!nla)
5036                 goto nla_put_failure;
5037         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5038
5039         /* XXX - MC not implemented */
5040
5041         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5042                 return 0;
5043
5044         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5045         if (!nla)
5046                 goto nla_put_failure;
5047         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5048
5049         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5050         if (!nla)
5051                 goto nla_put_failure;
5052         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5053
5054         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5055         if (!nla)
5056                 goto nla_put_failure;
5057
5058         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5059                 goto nla_put_failure;
5060
5061         read_lock_bh(&idev->lock);
5062         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5063         read_unlock_bh(&idev->lock);
5064
5065         return 0;
5066
5067 nla_put_failure:
5068         return -EMSGSIZE;
5069 }
5070
5071 static size_t inet6_get_link_af_size(const struct net_device *dev,
5072                                      u32 ext_filter_mask)
5073 {
5074         if (!__in6_dev_get(dev))
5075                 return 0;
5076
5077         return inet6_ifla6_size();
5078 }
5079
5080 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5081                               u32 ext_filter_mask)
5082 {
5083         struct inet6_dev *idev = __in6_dev_get(dev);
5084
5085         if (!idev)
5086                 return -ENODATA;
5087
5088         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5089                 return -EMSGSIZE;
5090
5091         return 0;
5092 }
5093
5094 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5095 {
5096         struct inet6_ifaddr *ifp;
5097         struct net_device *dev = idev->dev;
5098         bool clear_token, update_rs = false;
5099         struct in6_addr ll_addr;
5100
5101         ASSERT_RTNL();
5102
5103         if (!token)
5104                 return -EINVAL;
5105         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5106                 return -EINVAL;
5107         if (!ipv6_accept_ra(idev))
5108                 return -EINVAL;
5109         if (idev->cnf.rtr_solicits == 0)
5110                 return -EINVAL;
5111
5112         write_lock_bh(&idev->lock);
5113
5114         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5115         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5116
5117         write_unlock_bh(&idev->lock);
5118
5119         clear_token = ipv6_addr_any(token);
5120         if (clear_token)
5121                 goto update_lft;
5122
5123         if (!idev->dead && (idev->if_flags & IF_READY) &&
5124             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5125                              IFA_F_OPTIMISTIC)) {
5126                 /* If we're not ready, then normal ifup will take care
5127                  * of this. Otherwise, we need to request our rs here.
5128                  */
5129                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5130                 update_rs = true;
5131         }
5132
5133 update_lft:
5134         write_lock_bh(&idev->lock);
5135
5136         if (update_rs) {
5137                 idev->if_flags |= IF_RS_SENT;
5138                 idev->rs_interval = rfc3315_s14_backoff_init(
5139                         idev->cnf.rtr_solicit_interval);
5140                 idev->rs_probes = 1;
5141                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5142         }
5143
5144         /* Well, that's kinda nasty ... */
5145         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5146                 spin_lock(&ifp->lock);
5147                 if (ifp->tokenized) {
5148                         ifp->valid_lft = 0;
5149                         ifp->prefered_lft = 0;
5150                 }
5151                 spin_unlock(&ifp->lock);
5152         }
5153
5154         write_unlock_bh(&idev->lock);
5155         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5156         addrconf_verify_rtnl();
5157         return 0;
5158 }
5159
5160 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5161         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5162         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5163 };
5164
5165 static int inet6_validate_link_af(const struct net_device *dev,
5166                                   const struct nlattr *nla)
5167 {
5168         struct nlattr *tb[IFLA_INET6_MAX + 1];
5169
5170         if (dev && !__in6_dev_get(dev))
5171                 return -EAFNOSUPPORT;
5172
5173         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5174 }
5175
5176 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5177 {
5178         int err = -EINVAL;
5179         struct inet6_dev *idev = __in6_dev_get(dev);
5180         struct nlattr *tb[IFLA_INET6_MAX + 1];
5181
5182         if (!idev)
5183                 return -EAFNOSUPPORT;
5184
5185         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5186                 BUG();
5187
5188         if (tb[IFLA_INET6_TOKEN]) {
5189                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5190                 if (err)
5191                         return err;
5192         }
5193
5194         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5195                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5196
5197                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5198                     mode != IN6_ADDR_GEN_MODE_NONE &&
5199                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5200                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5201                         return -EINVAL;
5202
5203                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5204                     !idev->cnf.stable_secret.initialized &&
5205                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5206                         return -EINVAL;
5207
5208                 idev->addr_gen_mode = mode;
5209                 err = 0;
5210         }
5211
5212         return err;
5213 }
5214
5215 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5216                              u32 portid, u32 seq, int event, unsigned int flags)
5217 {
5218         struct net_device *dev = idev->dev;
5219         struct ifinfomsg *hdr;
5220         struct nlmsghdr *nlh;
5221         void *protoinfo;
5222
5223         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5224         if (!nlh)
5225                 return -EMSGSIZE;
5226
5227         hdr = nlmsg_data(nlh);
5228         hdr->ifi_family = AF_INET6;
5229         hdr->__ifi_pad = 0;
5230         hdr->ifi_type = dev->type;
5231         hdr->ifi_index = dev->ifindex;
5232         hdr->ifi_flags = dev_get_flags(dev);
5233         hdr->ifi_change = 0;
5234
5235         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5236             (dev->addr_len &&
5237              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5238             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5239             (dev->ifindex != dev_get_iflink(dev) &&
5240              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5241             nla_put_u8(skb, IFLA_OPERSTATE,
5242                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5243                 goto nla_put_failure;
5244         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5245         if (!protoinfo)
5246                 goto nla_put_failure;
5247
5248         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5249                 goto nla_put_failure;
5250
5251         nla_nest_end(skb, protoinfo);
5252         nlmsg_end(skb, nlh);
5253         return 0;
5254
5255 nla_put_failure:
5256         nlmsg_cancel(skb, nlh);
5257         return -EMSGSIZE;
5258 }
5259
5260 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5261 {
5262         struct net *net = sock_net(skb->sk);
5263         int h, s_h;
5264         int idx = 0, s_idx;
5265         struct net_device *dev;
5266         struct inet6_dev *idev;
5267         struct hlist_head *head;
5268
5269         s_h = cb->args[0];
5270         s_idx = cb->args[1];
5271
5272         rcu_read_lock();
5273         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5274                 idx = 0;
5275                 head = &net->dev_index_head[h];
5276                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5277                         if (idx < s_idx)
5278                                 goto cont;
5279                         idev = __in6_dev_get(dev);
5280                         if (!idev)
5281                                 goto cont;
5282                         if (inet6_fill_ifinfo(skb, idev,
5283                                               NETLINK_CB(cb->skb).portid,
5284                                               cb->nlh->nlmsg_seq,
5285                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5286                                 goto out;
5287 cont:
5288                         idx++;
5289                 }
5290         }
5291 out:
5292         rcu_read_unlock();
5293         cb->args[1] = idx;
5294         cb->args[0] = h;
5295
5296         return skb->len;
5297 }
5298
5299 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5300 {
5301         struct sk_buff *skb;
5302         struct net *net = dev_net(idev->dev);
5303         int err = -ENOBUFS;
5304
5305         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5306         if (!skb)
5307                 goto errout;
5308
5309         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5310         if (err < 0) {
5311                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5312                 WARN_ON(err == -EMSGSIZE);
5313                 kfree_skb(skb);
5314                 goto errout;
5315         }
5316         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5317         return;
5318 errout:
5319         if (err < 0)
5320                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5321 }
5322
5323 static inline size_t inet6_prefix_nlmsg_size(void)
5324 {
5325         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5326                + nla_total_size(sizeof(struct in6_addr))
5327                + nla_total_size(sizeof(struct prefix_cacheinfo));
5328 }
5329
5330 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5331                              struct prefix_info *pinfo, u32 portid, u32 seq,
5332                              int event, unsigned int flags)
5333 {
5334         struct prefixmsg *pmsg;
5335         struct nlmsghdr *nlh;
5336         struct prefix_cacheinfo ci;
5337
5338         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5339         if (!nlh)
5340                 return -EMSGSIZE;
5341
5342         pmsg = nlmsg_data(nlh);
5343         pmsg->prefix_family = AF_INET6;
5344         pmsg->prefix_pad1 = 0;
5345         pmsg->prefix_pad2 = 0;
5346         pmsg->prefix_ifindex = idev->dev->ifindex;
5347         pmsg->prefix_len = pinfo->prefix_len;
5348         pmsg->prefix_type = pinfo->type;
5349         pmsg->prefix_pad3 = 0;
5350         pmsg->prefix_flags = 0;
5351         if (pinfo->onlink)
5352                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5353         if (pinfo->autoconf)
5354                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5355
5356         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5357                 goto nla_put_failure;
5358         ci.preferred_time = ntohl(pinfo->prefered);
5359         ci.valid_time = ntohl(pinfo->valid);
5360         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5361                 goto nla_put_failure;
5362         nlmsg_end(skb, nlh);
5363         return 0;
5364
5365 nla_put_failure:
5366         nlmsg_cancel(skb, nlh);
5367         return -EMSGSIZE;
5368 }
5369
5370 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5371                          struct prefix_info *pinfo)
5372 {
5373         struct sk_buff *skb;
5374         struct net *net = dev_net(idev->dev);
5375         int err = -ENOBUFS;
5376
5377         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5378         if (!skb)
5379                 goto errout;
5380
5381         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5382         if (err < 0) {
5383                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5384                 WARN_ON(err == -EMSGSIZE);
5385                 kfree_skb(skb);
5386                 goto errout;
5387         }
5388         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5389         return;
5390 errout:
5391         if (err < 0)
5392                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5393 }
5394
5395 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5396 {
5397         struct net *net = dev_net(ifp->idev->dev);
5398
5399         if (event)
5400                 ASSERT_RTNL();
5401
5402         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5403
5404         switch (event) {
5405         case RTM_NEWADDR:
5406                 /*
5407                  * If the address was optimistic
5408                  * we inserted the route at the start of
5409                  * our DAD process, so we don't need
5410                  * to do it again
5411                  */
5412                 if (!(ifp->rt->rt6i_node))
5413                         ip6_ins_rt(ifp->rt);
5414                 if (ifp->idev->cnf.forwarding)
5415                         addrconf_join_anycast(ifp);
5416                 if (!ipv6_addr_any(&ifp->peer_addr))
5417                         addrconf_prefix_route(&ifp->peer_addr, 128,
5418                                               ifp->idev->dev, 0, 0);
5419                 break;
5420         case RTM_DELADDR:
5421                 if (ifp->idev->cnf.forwarding)
5422                         addrconf_leave_anycast(ifp);
5423                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5424                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5425                         struct rt6_info *rt;
5426
5427                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5428                                                        ifp->idev->dev, 0, 0);
5429                         if (rt)
5430                                 ip6_del_rt(rt);
5431                 }
5432                 if (ifp->rt) {
5433                         dst_hold(&ifp->rt->dst);
5434                         ip6_del_rt(ifp->rt);
5435                 }
5436                 rt_genid_bump_ipv6(net);
5437                 break;
5438         }
5439         atomic_inc(&net->ipv6.dev_addr_genid);
5440 }
5441
5442 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5443 {
5444         rcu_read_lock_bh();
5445         if (likely(ifp->idev->dead == 0))
5446                 __ipv6_ifa_notify(event, ifp);
5447         rcu_read_unlock_bh();
5448 }
5449
5450 #ifdef CONFIG_SYSCTL
5451
5452 static
5453 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5454                            void __user *buffer, size_t *lenp, loff_t *ppos)
5455 {
5456         int *valp = ctl->data;
5457         int val = *valp;
5458         loff_t pos = *ppos;
5459         struct ctl_table lctl;
5460         int ret;
5461
5462         /*
5463          * ctl->data points to idev->cnf.forwarding, we should
5464          * not modify it until we get the rtnl lock.
5465          */
5466         lctl = *ctl;
5467         lctl.data = &val;
5468
5469         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5470
5471         if (write)
5472                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5473         if (ret)
5474                 *ppos = pos;
5475         return ret;
5476 }
5477
5478 static
5479 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5480                         void __user *buffer, size_t *lenp, loff_t *ppos)
5481 {
5482         struct inet6_dev *idev = ctl->extra1;
5483         int min_mtu = IPV6_MIN_MTU;
5484         struct ctl_table lctl;
5485
5486         lctl = *ctl;
5487         lctl.extra1 = &min_mtu;
5488         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5489
5490         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5491 }
5492
5493 static void dev_disable_change(struct inet6_dev *idev)
5494 {
5495         struct netdev_notifier_info info;
5496
5497         if (!idev || !idev->dev)
5498                 return;
5499
5500         netdev_notifier_info_init(&info, idev->dev);
5501         if (idev->cnf.disable_ipv6)
5502                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5503         else
5504                 addrconf_notify(NULL, NETDEV_UP, &info);
5505 }
5506
5507 static void addrconf_disable_change(struct net *net, __s32 newf)
5508 {
5509         struct net_device *dev;
5510         struct inet6_dev *idev;
5511
5512         rcu_read_lock();
5513         for_each_netdev_rcu(net, dev) {
5514                 idev = __in6_dev_get(dev);
5515                 if (idev) {
5516                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5517                         idev->cnf.disable_ipv6 = newf;
5518                         if (changed)
5519                                 dev_disable_change(idev);
5520                 }
5521         }
5522         rcu_read_unlock();
5523 }
5524
5525 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5526 {
5527         struct net *net;
5528         int old;
5529
5530         if (!rtnl_trylock())
5531                 return restart_syscall();
5532
5533         net = (struct net *)table->extra2;
5534         old = *p;
5535         *p = newf;
5536
5537         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5538                 rtnl_unlock();
5539                 return 0;
5540         }
5541
5542         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5543                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5544                 addrconf_disable_change(net, newf);
5545         } else if ((!newf) ^ (!old))
5546                 dev_disable_change((struct inet6_dev *)table->extra1);
5547
5548         rtnl_unlock();
5549         return 0;
5550 }
5551
5552 static
5553 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5554                             void __user *buffer, size_t *lenp, loff_t *ppos)
5555 {
5556         int *valp = ctl->data;
5557         int val = *valp;
5558         loff_t pos = *ppos;
5559         struct ctl_table lctl;
5560         int ret;
5561
5562         /*
5563          * ctl->data points to idev->cnf.disable_ipv6, we should
5564          * not modify it until we get the rtnl lock.
5565          */
5566         lctl = *ctl;
5567         lctl.data = &val;
5568
5569         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5570
5571         if (write)
5572                 ret = addrconf_disable_ipv6(ctl, valp, val);
5573         if (ret)
5574                 *ppos = pos;
5575         return ret;
5576 }
5577
5578 static
5579 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5580                               void __user *buffer, size_t *lenp, loff_t *ppos)
5581 {
5582         int *valp = ctl->data;
5583         int ret;
5584         int old, new;
5585
5586         old = *valp;
5587         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5588         new = *valp;
5589
5590         if (write && old != new) {
5591                 struct net *net = ctl->extra2;
5592
5593                 if (!rtnl_trylock())
5594                         return restart_syscall();
5595
5596                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5597                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5598                                                      NETCONFA_IFINDEX_DEFAULT,
5599                                                      net->ipv6.devconf_dflt);
5600                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5601                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5602                                                      NETCONFA_IFINDEX_ALL,
5603                                                      net->ipv6.devconf_all);
5604                 else {
5605                         struct inet6_dev *idev = ctl->extra1;
5606
5607                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5608                                                      idev->dev->ifindex,
5609                                                      &idev->cnf);
5610                 }
5611                 rtnl_unlock();
5612         }
5613
5614         return ret;
5615 }
5616
5617 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5618                                          void __user *buffer, size_t *lenp,
5619                                          loff_t *ppos)
5620 {
5621         int err;
5622         struct in6_addr addr;
5623         char str[IPV6_MAX_STRLEN];
5624         struct ctl_table lctl = *ctl;
5625         struct net *net = ctl->extra2;
5626         struct ipv6_stable_secret *secret = ctl->data;
5627
5628         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5629                 return -EIO;
5630
5631         lctl.maxlen = IPV6_MAX_STRLEN;
5632         lctl.data = str;
5633
5634         if (!rtnl_trylock())
5635                 return restart_syscall();
5636
5637         if (!write && !secret->initialized) {
5638                 err = -EIO;
5639                 goto out;
5640         }
5641
5642         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5643         if (err >= sizeof(str)) {
5644                 err = -EIO;
5645                 goto out;
5646         }
5647
5648         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5649         if (err || !write)
5650                 goto out;
5651
5652         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5653                 err = -EIO;
5654                 goto out;
5655         }
5656
5657         secret->initialized = true;
5658         secret->secret = addr;
5659
5660         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5661                 struct net_device *dev;
5662
5663                 for_each_netdev(net, dev) {
5664                         struct inet6_dev *idev = __in6_dev_get(dev);
5665
5666                         if (idev) {
5667                                 idev->addr_gen_mode =
5668                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5669                         }
5670                 }
5671         } else {
5672                 struct inet6_dev *idev = ctl->extra1;
5673
5674                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5675         }
5676
5677 out:
5678         rtnl_unlock();
5679
5680         return err;
5681 }
5682
5683 static
5684 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5685                                                 int write,
5686                                                 void __user *buffer,
5687                                                 size_t *lenp,
5688                                                 loff_t *ppos)
5689 {
5690         int *valp = ctl->data;
5691         int val = *valp;
5692         loff_t pos = *ppos;
5693         struct ctl_table lctl;
5694         int ret;
5695
5696         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5697          * we should not modify it until we get the rtnl lock.
5698          */
5699         lctl = *ctl;
5700         lctl.data = &val;
5701
5702         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5703
5704         if (write)
5705                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5706         if (ret)
5707                 *ppos = pos;
5708         return ret;
5709 }
5710
5711 static int minus_one = -1;
5712 static const int one = 1;
5713 static const int two_five_five = 255;
5714
5715 static const struct ctl_table addrconf_sysctl[] = {
5716         {
5717                 .procname       = "forwarding",
5718                 .data           = &ipv6_devconf.forwarding,
5719                 .maxlen         = sizeof(int),
5720                 .mode           = 0644,
5721                 .proc_handler   = addrconf_sysctl_forward,
5722         },
5723         {
5724                 .procname       = "hop_limit",
5725                 .data           = &ipv6_devconf.hop_limit,
5726                 .maxlen         = sizeof(int),
5727                 .mode           = 0644,
5728                 .proc_handler   = proc_dointvec_minmax,
5729                 .extra1         = (void *)&one,
5730                 .extra2         = (void *)&two_five_five,
5731         },
5732         {
5733                 .procname       = "mtu",
5734                 .data           = &ipv6_devconf.mtu6,
5735                 .maxlen         = sizeof(int),
5736                 .mode           = 0644,
5737                 .proc_handler   = addrconf_sysctl_mtu,
5738         },
5739         {
5740                 .procname       = "accept_ra",
5741                 .data           = &ipv6_devconf.accept_ra,
5742                 .maxlen         = sizeof(int),
5743                 .mode           = 0644,
5744                 .proc_handler   = proc_dointvec,
5745         },
5746         {
5747                 .procname       = "accept_redirects",
5748                 .data           = &ipv6_devconf.accept_redirects,
5749                 .maxlen         = sizeof(int),
5750                 .mode           = 0644,
5751                 .proc_handler   = proc_dointvec,
5752         },
5753         {
5754                 .procname       = "autoconf",
5755                 .data           = &ipv6_devconf.autoconf,
5756                 .maxlen         = sizeof(int),
5757                 .mode           = 0644,
5758                 .proc_handler   = proc_dointvec,
5759         },
5760         {
5761                 .procname       = "dad_transmits",
5762                 .data           = &ipv6_devconf.dad_transmits,
5763                 .maxlen         = sizeof(int),
5764                 .mode           = 0644,
5765                 .proc_handler   = proc_dointvec,
5766         },
5767         {
5768                 .procname       = "router_solicitations",
5769                 .data           = &ipv6_devconf.rtr_solicits,
5770                 .maxlen         = sizeof(int),
5771                 .mode           = 0644,
5772                 .proc_handler   = proc_dointvec_minmax,
5773                 .extra1         = &minus_one,
5774         },
5775         {
5776                 .procname       = "router_solicitation_interval",
5777                 .data           = &ipv6_devconf.rtr_solicit_interval,
5778                 .maxlen         = sizeof(int),
5779                 .mode           = 0644,
5780                 .proc_handler   = proc_dointvec_jiffies,
5781         },
5782         {
5783                 .procname       = "router_solicitation_max_interval",
5784                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
5785                 .maxlen         = sizeof(int),
5786                 .mode           = 0644,
5787                 .proc_handler   = proc_dointvec_jiffies,
5788         },
5789         {
5790                 .procname       = "router_solicitation_delay",
5791                 .data           = &ipv6_devconf.rtr_solicit_delay,
5792                 .maxlen         = sizeof(int),
5793                 .mode           = 0644,
5794                 .proc_handler   = proc_dointvec_jiffies,
5795         },
5796         {
5797                 .procname       = "force_mld_version",
5798                 .data           = &ipv6_devconf.force_mld_version,
5799                 .maxlen         = sizeof(int),
5800                 .mode           = 0644,
5801                 .proc_handler   = proc_dointvec,
5802         },
5803         {
5804                 .procname       = "mldv1_unsolicited_report_interval",
5805                 .data           =
5806                         &ipv6_devconf.mldv1_unsolicited_report_interval,
5807                 .maxlen         = sizeof(int),
5808                 .mode           = 0644,
5809                 .proc_handler   = proc_dointvec_ms_jiffies,
5810         },
5811         {
5812                 .procname       = "mldv2_unsolicited_report_interval",
5813                 .data           =
5814                         &ipv6_devconf.mldv2_unsolicited_report_interval,
5815                 .maxlen         = sizeof(int),
5816                 .mode           = 0644,
5817                 .proc_handler   = proc_dointvec_ms_jiffies,
5818         },
5819         {
5820                 .procname       = "use_tempaddr",
5821                 .data           = &ipv6_devconf.use_tempaddr,
5822                 .maxlen         = sizeof(int),
5823                 .mode           = 0644,
5824                 .proc_handler   = proc_dointvec,
5825         },
5826         {
5827                 .procname       = "temp_valid_lft",
5828                 .data           = &ipv6_devconf.temp_valid_lft,
5829                 .maxlen         = sizeof(int),
5830                 .mode           = 0644,
5831                 .proc_handler   = proc_dointvec,
5832         },
5833         {
5834                 .procname       = "temp_prefered_lft",
5835                 .data           = &ipv6_devconf.temp_prefered_lft,
5836                 .maxlen         = sizeof(int),
5837                 .mode           = 0644,
5838                 .proc_handler   = proc_dointvec,
5839         },
5840         {
5841                 .procname       = "regen_max_retry",
5842                 .data           = &ipv6_devconf.regen_max_retry,
5843                 .maxlen         = sizeof(int),
5844                 .mode           = 0644,
5845                 .proc_handler   = proc_dointvec,
5846         },
5847         {
5848                 .procname       = "max_desync_factor",
5849                 .data           = &ipv6_devconf.max_desync_factor,
5850                 .maxlen         = sizeof(int),
5851                 .mode           = 0644,
5852                 .proc_handler   = proc_dointvec,
5853         },
5854         {
5855                 .procname       = "max_addresses",
5856                 .data           = &ipv6_devconf.max_addresses,
5857                 .maxlen         = sizeof(int),
5858                 .mode           = 0644,
5859                 .proc_handler   = proc_dointvec,
5860         },
5861         {
5862                 .procname       = "accept_ra_defrtr",
5863                 .data           = &ipv6_devconf.accept_ra_defrtr,
5864                 .maxlen         = sizeof(int),
5865                 .mode           = 0644,
5866                 .proc_handler   = proc_dointvec,
5867         },
5868         {
5869                 .procname       = "accept_ra_min_hop_limit",
5870                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5871                 .maxlen         = sizeof(int),
5872                 .mode           = 0644,
5873                 .proc_handler   = proc_dointvec,
5874         },
5875         {
5876                 .procname       = "accept_ra_pinfo",
5877                 .data           = &ipv6_devconf.accept_ra_pinfo,
5878                 .maxlen         = sizeof(int),
5879                 .mode           = 0644,
5880                 .proc_handler   = proc_dointvec,
5881         },
5882 #ifdef CONFIG_IPV6_ROUTER_PREF
5883         {
5884                 .procname       = "accept_ra_rtr_pref",
5885                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
5886                 .maxlen         = sizeof(int),
5887                 .mode           = 0644,
5888                 .proc_handler   = proc_dointvec,
5889         },
5890         {
5891                 .procname       = "router_probe_interval",
5892                 .data           = &ipv6_devconf.rtr_probe_interval,
5893                 .maxlen         = sizeof(int),
5894                 .mode           = 0644,
5895                 .proc_handler   = proc_dointvec_jiffies,
5896         },
5897 #ifdef CONFIG_IPV6_ROUTE_INFO
5898         {
5899                 .procname       = "accept_ra_rt_info_max_plen",
5900                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5901                 .maxlen         = sizeof(int),
5902                 .mode           = 0644,
5903                 .proc_handler   = proc_dointvec,
5904         },
5905 #endif
5906 #endif
5907         {
5908                 .procname       = "proxy_ndp",
5909                 .data           = &ipv6_devconf.proxy_ndp,
5910                 .maxlen         = sizeof(int),
5911                 .mode           = 0644,
5912                 .proc_handler   = addrconf_sysctl_proxy_ndp,
5913         },
5914         {
5915                 .procname       = "accept_source_route",
5916                 .data           = &ipv6_devconf.accept_source_route,
5917                 .maxlen         = sizeof(int),
5918                 .mode           = 0644,
5919                 .proc_handler   = proc_dointvec,
5920         },
5921 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5922         {
5923                 .procname       = "optimistic_dad",
5924                 .data           = &ipv6_devconf.optimistic_dad,
5925                 .maxlen         = sizeof(int),
5926                 .mode           = 0644,
5927                 .proc_handler   = proc_dointvec,
5928         },
5929         {
5930                 .procname       = "use_optimistic",
5931                 .data           = &ipv6_devconf.use_optimistic,
5932                 .maxlen         = sizeof(int),
5933                 .mode           = 0644,
5934                 .proc_handler   = proc_dointvec,
5935         },
5936 #endif
5937 #ifdef CONFIG_IPV6_MROUTE
5938         {
5939                 .procname       = "mc_forwarding",
5940                 .data           = &ipv6_devconf.mc_forwarding,
5941                 .maxlen         = sizeof(int),
5942                 .mode           = 0444,
5943                 .proc_handler   = proc_dointvec,
5944         },
5945 #endif
5946         {
5947                 .procname       = "disable_ipv6",
5948                 .data           = &ipv6_devconf.disable_ipv6,
5949                 .maxlen         = sizeof(int),
5950                 .mode           = 0644,
5951                 .proc_handler   = addrconf_sysctl_disable,
5952         },
5953         {
5954                 .procname       = "accept_dad",
5955                 .data           = &ipv6_devconf.accept_dad,
5956                 .maxlen         = sizeof(int),
5957                 .mode           = 0644,
5958                 .proc_handler   = proc_dointvec,
5959         },
5960         {
5961                 .procname       = "force_tllao",
5962                 .data           = &ipv6_devconf.force_tllao,
5963                 .maxlen         = sizeof(int),
5964                 .mode           = 0644,
5965                 .proc_handler   = proc_dointvec
5966         },
5967         {
5968                 .procname       = "ndisc_notify",
5969                 .data           = &ipv6_devconf.ndisc_notify,
5970                 .maxlen         = sizeof(int),
5971                 .mode           = 0644,
5972                 .proc_handler   = proc_dointvec
5973         },
5974         {
5975                 .procname       = "suppress_frag_ndisc",
5976                 .data           = &ipv6_devconf.suppress_frag_ndisc,
5977                 .maxlen         = sizeof(int),
5978                 .mode           = 0644,
5979                 .proc_handler   = proc_dointvec
5980         },
5981         {
5982                 .procname       = "accept_ra_from_local",
5983                 .data           = &ipv6_devconf.accept_ra_from_local,
5984                 .maxlen         = sizeof(int),
5985                 .mode           = 0644,
5986                 .proc_handler   = proc_dointvec,
5987         },
5988         {
5989                 .procname       = "accept_ra_mtu",
5990                 .data           = &ipv6_devconf.accept_ra_mtu,
5991                 .maxlen         = sizeof(int),
5992                 .mode           = 0644,
5993                 .proc_handler   = proc_dointvec,
5994         },
5995         {
5996                 .procname       = "stable_secret",
5997                 .data           = &ipv6_devconf.stable_secret,
5998                 .maxlen         = IPV6_MAX_STRLEN,
5999                 .mode           = 0600,
6000                 .proc_handler   = addrconf_sysctl_stable_secret,
6001         },
6002         {
6003                 .procname       = "use_oif_addrs_only",
6004                 .data           = &ipv6_devconf.use_oif_addrs_only,
6005                 .maxlen         = sizeof(int),
6006                 .mode           = 0644,
6007                 .proc_handler   = proc_dointvec,
6008         },
6009         {
6010                 .procname       = "ignore_routes_with_linkdown",
6011                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6012                 .maxlen         = sizeof(int),
6013                 .mode           = 0644,
6014                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6015         },
6016         {
6017                 .procname       = "drop_unicast_in_l2_multicast",
6018                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6019                 .maxlen         = sizeof(int),
6020                 .mode           = 0644,
6021                 .proc_handler   = proc_dointvec,
6022         },
6023         {
6024                 .procname       = "drop_unsolicited_na",
6025                 .data           = &ipv6_devconf.drop_unsolicited_na,
6026                 .maxlen         = sizeof(int),
6027                 .mode           = 0644,
6028                 .proc_handler   = proc_dointvec,
6029         },
6030         {
6031                 .procname       = "keep_addr_on_down",
6032                 .data           = &ipv6_devconf.keep_addr_on_down,
6033                 .maxlen         = sizeof(int),
6034                 .mode           = 0644,
6035                 .proc_handler   = proc_dointvec,
6036
6037         },
6038         {
6039                 /* sentinel */
6040         }
6041 };
6042
6043 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6044                 struct inet6_dev *idev, struct ipv6_devconf *p)
6045 {
6046         int i, ifindex;
6047         struct ctl_table *table;
6048         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6049
6050         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6051         if (!table)
6052                 goto out;
6053
6054         for (i = 0; table[i].data; i++) {
6055                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6056                 /* If one of these is already set, then it is not safe to
6057                  * overwrite either of them: this makes proc_dointvec_minmax
6058                  * usable.
6059                  */
6060                 if (!table[i].extra1 && !table[i].extra2) {
6061                         table[i].extra1 = idev; /* embedded; no ref */
6062                         table[i].extra2 = net;
6063                 }
6064         }
6065
6066         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6067
6068         p->sysctl_header = register_net_sysctl(net, path, table);
6069         if (!p->sysctl_header)
6070                 goto free;
6071
6072         if (!strcmp(dev_name, "all"))
6073                 ifindex = NETCONFA_IFINDEX_ALL;
6074         else if (!strcmp(dev_name, "default"))
6075                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6076         else
6077                 ifindex = idev->dev->ifindex;
6078         inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6079         return 0;
6080
6081 free:
6082         kfree(table);
6083 out:
6084         return -ENOBUFS;
6085 }
6086
6087 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6088 {
6089         struct ctl_table *table;
6090
6091         if (!p->sysctl_header)
6092                 return;
6093
6094         table = p->sysctl_header->ctl_table_arg;
6095         unregister_net_sysctl_table(p->sysctl_header);
6096         p->sysctl_header = NULL;
6097         kfree(table);
6098 }
6099
6100 static int addrconf_sysctl_register(struct inet6_dev *idev)
6101 {
6102         int err;
6103
6104         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6105                 return -EINVAL;
6106
6107         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6108                                     &ndisc_ifinfo_sysctl_change);
6109         if (err)
6110                 return err;
6111         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6112                                          idev, &idev->cnf);
6113         if (err)
6114                 neigh_sysctl_unregister(idev->nd_parms);
6115
6116         return err;
6117 }
6118
6119 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6120 {
6121         __addrconf_sysctl_unregister(&idev->cnf);
6122         neigh_sysctl_unregister(idev->nd_parms);
6123 }
6124
6125
6126 #endif
6127
6128 static int __net_init addrconf_init_net(struct net *net)
6129 {
6130         int err = -ENOMEM;
6131         struct ipv6_devconf *all, *dflt;
6132
6133         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6134         if (!all)
6135                 goto err_alloc_all;
6136
6137         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6138         if (!dflt)
6139                 goto err_alloc_dflt;
6140
6141         /* these will be inherited by all namespaces */
6142         dflt->autoconf = ipv6_defaults.autoconf;
6143         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6144
6145         dflt->stable_secret.initialized = false;
6146         all->stable_secret.initialized = false;
6147
6148         net->ipv6.devconf_all = all;
6149         net->ipv6.devconf_dflt = dflt;
6150
6151 #ifdef CONFIG_SYSCTL
6152         err = __addrconf_sysctl_register(net, "all", NULL, all);
6153         if (err < 0)
6154                 goto err_reg_all;
6155
6156         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6157         if (err < 0)
6158                 goto err_reg_dflt;
6159 #endif
6160         return 0;
6161
6162 #ifdef CONFIG_SYSCTL
6163 err_reg_dflt:
6164         __addrconf_sysctl_unregister(all);
6165 err_reg_all:
6166         kfree(dflt);
6167 #endif
6168 err_alloc_dflt:
6169         kfree(all);
6170 err_alloc_all:
6171         return err;
6172 }
6173
6174 static void __net_exit addrconf_exit_net(struct net *net)
6175 {
6176 #ifdef CONFIG_SYSCTL
6177         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6178         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6179 #endif
6180         kfree(net->ipv6.devconf_dflt);
6181         kfree(net->ipv6.devconf_all);
6182 }
6183
6184 static struct pernet_operations addrconf_ops = {
6185         .init = addrconf_init_net,
6186         .exit = addrconf_exit_net,
6187 };
6188
6189 static struct rtnl_af_ops inet6_ops __read_mostly = {
6190         .family           = AF_INET6,
6191         .fill_link_af     = inet6_fill_link_af,
6192         .get_link_af_size = inet6_get_link_af_size,
6193         .validate_link_af = inet6_validate_link_af,
6194         .set_link_af      = inet6_set_link_af,
6195 };
6196
6197 /*
6198  *      Init / cleanup code
6199  */
6200
6201 int __init addrconf_init(void)
6202 {
6203         struct inet6_dev *idev;
6204         int i, err;
6205
6206         err = ipv6_addr_label_init();
6207         if (err < 0) {
6208                 pr_crit("%s: cannot initialize default policy table: %d\n",
6209                         __func__, err);
6210                 goto out;
6211         }
6212
6213         err = register_pernet_subsys(&addrconf_ops);
6214         if (err < 0)
6215                 goto out_addrlabel;
6216
6217         addrconf_wq = create_workqueue("ipv6_addrconf");
6218         if (!addrconf_wq) {
6219                 err = -ENOMEM;
6220                 goto out_nowq;
6221         }
6222
6223         /* The addrconf netdev notifier requires that loopback_dev
6224          * has it's ipv6 private information allocated and setup
6225          * before it can bring up and give link-local addresses
6226          * to other devices which are up.
6227          *
6228          * Unfortunately, loopback_dev is not necessarily the first
6229          * entry in the global dev_base list of net devices.  In fact,
6230          * it is likely to be the very last entry on that list.
6231          * So this causes the notifier registry below to try and
6232          * give link-local addresses to all devices besides loopback_dev
6233          * first, then loopback_dev, which cases all the non-loopback_dev
6234          * devices to fail to get a link-local address.
6235          *
6236          * So, as a temporary fix, allocate the ipv6 structure for
6237          * loopback_dev first by hand.
6238          * Longer term, all of the dependencies ipv6 has upon the loopback
6239          * device and it being up should be removed.
6240          */
6241         rtnl_lock();
6242         idev = ipv6_add_dev(init_net.loopback_dev);
6243         rtnl_unlock();
6244         if (IS_ERR(idev)) {
6245                 err = PTR_ERR(idev);
6246                 goto errlo;
6247         }
6248
6249         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6250                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6251
6252         register_netdevice_notifier(&ipv6_dev_notf);
6253
6254         addrconf_verify();
6255
6256         rtnl_af_register(&inet6_ops);
6257
6258         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6259                               NULL);
6260         if (err < 0)
6261                 goto errout;
6262
6263         /* Only the first call to __rtnl_register can fail */
6264         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6265         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6266         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6267                         inet6_dump_ifaddr, NULL);
6268         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6269                         inet6_dump_ifmcaddr, NULL);
6270         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6271                         inet6_dump_ifacaddr, NULL);
6272         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6273                         inet6_netconf_dump_devconf, NULL);
6274
6275         ipv6_addr_label_rtnl_register();
6276
6277         return 0;
6278 errout:
6279         rtnl_af_unregister(&inet6_ops);
6280         unregister_netdevice_notifier(&ipv6_dev_notf);
6281 errlo:
6282         destroy_workqueue(addrconf_wq);
6283 out_nowq:
6284         unregister_pernet_subsys(&addrconf_ops);
6285 out_addrlabel:
6286         ipv6_addr_label_cleanup();
6287 out:
6288         return err;
6289 }
6290
6291 void addrconf_cleanup(void)
6292 {
6293         struct net_device *dev;
6294         int i;
6295
6296         unregister_netdevice_notifier(&ipv6_dev_notf);
6297         unregister_pernet_subsys(&addrconf_ops);
6298         ipv6_addr_label_cleanup();
6299
6300         rtnl_lock();
6301
6302         __rtnl_af_unregister(&inet6_ops);
6303
6304         /* clean dev list */
6305         for_each_netdev(&init_net, dev) {
6306                 if (__in6_dev_get(dev) == NULL)
6307                         continue;
6308                 addrconf_ifdown(dev, 1);
6309         }
6310         addrconf_ifdown(init_net.loopback_dev, 2);
6311
6312         /*
6313          *      Check hash table.
6314          */
6315         spin_lock_bh(&addrconf_hash_lock);
6316         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6317                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6318         spin_unlock_bh(&addrconf_hash_lock);
6319         cancel_delayed_work(&addr_chk_work);
6320         rtnl_unlock();
6321
6322         destroy_workqueue(addrconf_wq);
6323 }