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
1189         write_lock_bh(&idev->lock);
1190         if (ift) {
1191                 spin_lock_bh(&ift->lock);
1192                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1193                 spin_unlock_bh(&ift->lock);
1194                 tmpaddr = &addr;
1195         } else {
1196                 tmpaddr = NULL;
1197         }
1198 retry:
1199         in6_dev_hold(idev);
1200         if (idev->cnf.use_tempaddr <= 0) {
1201                 write_unlock_bh(&idev->lock);
1202                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1203                 in6_dev_put(idev);
1204                 ret = -1;
1205                 goto out;
1206         }
1207         spin_lock_bh(&ifp->lock);
1208         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1209                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1210                 spin_unlock_bh(&ifp->lock);
1211                 write_unlock_bh(&idev->lock);
1212                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1213                         __func__);
1214                 in6_dev_put(idev);
1215                 ret = -1;
1216                 goto out;
1217         }
1218         in6_ifa_hold(ifp);
1219         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1220         ipv6_try_regen_rndid(idev, tmpaddr);
1221         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1222         age = (now - ifp->tstamp) / HZ;
1223
1224         regen_advance = idev->cnf.regen_max_retry *
1225                         idev->cnf.dad_transmits *
1226                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1227
1228         /* recalculate max_desync_factor each time and update
1229          * idev->desync_factor if it's larger
1230          */
1231         max_desync_factor = min_t(__u32,
1232                                   idev->cnf.max_desync_factor,
1233                                   idev->cnf.temp_prefered_lft - regen_advance);
1234
1235         if (unlikely(idev->desync_factor > max_desync_factor)) {
1236                 if (max_desync_factor > 0) {
1237                         get_random_bytes(&idev->desync_factor,
1238                                          sizeof(idev->desync_factor));
1239                         idev->desync_factor %= max_desync_factor;
1240                 } else {
1241                         idev->desync_factor = 0;
1242                 }
1243         }
1244
1245         tmp_valid_lft = min_t(__u32,
1246                               ifp->valid_lft,
1247                               idev->cnf.temp_valid_lft + age);
1248         tmp_prefered_lft = idev->cnf.temp_prefered_lft + age -
1249                             idev->desync_factor;
1250         /* guard against underflow in case of concurrent updates to cnf */
1251         if (unlikely(tmp_prefered_lft < 0))
1252                 tmp_prefered_lft = 0;
1253         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1254         tmp_plen = ifp->prefix_len;
1255         tmp_tstamp = ifp->tstamp;
1256         spin_unlock_bh(&ifp->lock);
1257
1258         write_unlock_bh(&idev->lock);
1259
1260         /* A temporary address is created only if this calculated Preferred
1261          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1262          * an implementation must not create a temporary address with a zero
1263          * Preferred Lifetime.
1264          * Use age calculation as in addrconf_verify to avoid unnecessary
1265          * temporary addresses being generated.
1266          */
1267         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1268         if (tmp_prefered_lft <= regen_advance + age) {
1269                 in6_ifa_put(ifp);
1270                 in6_dev_put(idev);
1271                 ret = -1;
1272                 goto out;
1273         }
1274
1275         addr_flags = IFA_F_TEMPORARY;
1276         /* set in addrconf_prefix_rcv() */
1277         if (ifp->flags & IFA_F_OPTIMISTIC)
1278                 addr_flags |= IFA_F_OPTIMISTIC;
1279
1280         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1281                             ipv6_addr_scope(&addr), addr_flags,
1282                             tmp_valid_lft, tmp_prefered_lft);
1283         if (IS_ERR(ift)) {
1284                 in6_ifa_put(ifp);
1285                 in6_dev_put(idev);
1286                 pr_info("%s: retry temporary address regeneration\n", __func__);
1287                 tmpaddr = &addr;
1288                 write_lock_bh(&idev->lock);
1289                 goto retry;
1290         }
1291
1292         spin_lock_bh(&ift->lock);
1293         ift->ifpub = ifp;
1294         ift->cstamp = now;
1295         ift->tstamp = tmp_tstamp;
1296         spin_unlock_bh(&ift->lock);
1297
1298         addrconf_dad_start(ift);
1299         in6_ifa_put(ift);
1300         in6_dev_put(idev);
1301 out:
1302         return ret;
1303 }
1304
1305 /*
1306  *      Choose an appropriate source address (RFC3484)
1307  */
1308 enum {
1309         IPV6_SADDR_RULE_INIT = 0,
1310         IPV6_SADDR_RULE_LOCAL,
1311         IPV6_SADDR_RULE_SCOPE,
1312         IPV6_SADDR_RULE_PREFERRED,
1313 #ifdef CONFIG_IPV6_MIP6
1314         IPV6_SADDR_RULE_HOA,
1315 #endif
1316         IPV6_SADDR_RULE_OIF,
1317         IPV6_SADDR_RULE_LABEL,
1318         IPV6_SADDR_RULE_PRIVACY,
1319         IPV6_SADDR_RULE_ORCHID,
1320         IPV6_SADDR_RULE_PREFIX,
1321 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1322         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1323 #endif
1324         IPV6_SADDR_RULE_MAX
1325 };
1326
1327 struct ipv6_saddr_score {
1328         int                     rule;
1329         int                     addr_type;
1330         struct inet6_ifaddr     *ifa;
1331         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1332         int                     scopedist;
1333         int                     matchlen;
1334 };
1335
1336 struct ipv6_saddr_dst {
1337         const struct in6_addr *addr;
1338         int ifindex;
1339         int scope;
1340         int label;
1341         unsigned int prefs;
1342 };
1343
1344 static inline int ipv6_saddr_preferred(int type)
1345 {
1346         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1347                 return 1;
1348         return 0;
1349 }
1350
1351 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1352 {
1353 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1354         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1355 #else
1356         return false;
1357 #endif
1358 }
1359
1360 static int ipv6_get_saddr_eval(struct net *net,
1361                                struct ipv6_saddr_score *score,
1362                                struct ipv6_saddr_dst *dst,
1363                                int i)
1364 {
1365         int ret;
1366
1367         if (i <= score->rule) {
1368                 switch (i) {
1369                 case IPV6_SADDR_RULE_SCOPE:
1370                         ret = score->scopedist;
1371                         break;
1372                 case IPV6_SADDR_RULE_PREFIX:
1373                         ret = score->matchlen;
1374                         break;
1375                 default:
1376                         ret = !!test_bit(i, score->scorebits);
1377                 }
1378                 goto out;
1379         }
1380
1381         switch (i) {
1382         case IPV6_SADDR_RULE_INIT:
1383                 /* Rule 0: remember if hiscore is not ready yet */
1384                 ret = !!score->ifa;
1385                 break;
1386         case IPV6_SADDR_RULE_LOCAL:
1387                 /* Rule 1: Prefer same address */
1388                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1389                 break;
1390         case IPV6_SADDR_RULE_SCOPE:
1391                 /* Rule 2: Prefer appropriate scope
1392                  *
1393                  *      ret
1394                  *       ^
1395                  *    -1 |  d 15
1396                  *    ---+--+-+---> scope
1397                  *       |
1398                  *       |             d is scope of the destination.
1399                  *  B-d  |  \
1400                  *       |   \      <- smaller scope is better if
1401                  *  B-15 |    \        if scope is enough for destination.
1402                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1403                  * d-C-1 | /
1404                  *       |/         <- greater is better
1405                  *   -C  /             if scope is not enough for destination.
1406                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1407                  *
1408                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1409                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1410                  * Assume B = 0 and we get C > 29.
1411                  */
1412                 ret = __ipv6_addr_src_scope(score->addr_type);
1413                 if (ret >= dst->scope)
1414                         ret = -ret;
1415                 else
1416                         ret -= 128;     /* 30 is enough */
1417                 score->scopedist = ret;
1418                 break;
1419         case IPV6_SADDR_RULE_PREFERRED:
1420             {
1421                 /* Rule 3: Avoid deprecated and optimistic addresses */
1422                 u8 avoid = IFA_F_DEPRECATED;
1423
1424                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1425                         avoid |= IFA_F_OPTIMISTIC;
1426                 ret = ipv6_saddr_preferred(score->addr_type) ||
1427                       !(score->ifa->flags & avoid);
1428                 break;
1429             }
1430 #ifdef CONFIG_IPV6_MIP6
1431         case IPV6_SADDR_RULE_HOA:
1432             {
1433                 /* Rule 4: Prefer home address */
1434                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1435                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1436                 break;
1437             }
1438 #endif
1439         case IPV6_SADDR_RULE_OIF:
1440                 /* Rule 5: Prefer outgoing interface */
1441                 ret = (!dst->ifindex ||
1442                        dst->ifindex == score->ifa->idev->dev->ifindex);
1443                 break;
1444         case IPV6_SADDR_RULE_LABEL:
1445                 /* Rule 6: Prefer matching label */
1446                 ret = ipv6_addr_label(net,
1447                                       &score->ifa->addr, score->addr_type,
1448                                       score->ifa->idev->dev->ifindex) == dst->label;
1449                 break;
1450         case IPV6_SADDR_RULE_PRIVACY:
1451             {
1452                 /* Rule 7: Prefer public address
1453                  * Note: prefer temporary address if use_tempaddr >= 2
1454                  */
1455                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1456                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1457                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1458                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1459                 break;
1460             }
1461         case IPV6_SADDR_RULE_ORCHID:
1462                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1463                  *          non-ORCHID vs non-ORCHID
1464                  */
1465                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1466                         ipv6_addr_orchid(dst->addr));
1467                 break;
1468         case IPV6_SADDR_RULE_PREFIX:
1469                 /* Rule 8: Use longest matching prefix */
1470                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1471                 if (ret > score->ifa->prefix_len)
1472                         ret = score->ifa->prefix_len;
1473                 score->matchlen = ret;
1474                 break;
1475 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1476         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1477                 /* Optimistic addresses still have lower precedence than other
1478                  * preferred addresses.
1479                  */
1480                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1481                 break;
1482 #endif
1483         default:
1484                 ret = 0;
1485         }
1486
1487         if (ret)
1488                 __set_bit(i, score->scorebits);
1489         score->rule = i;
1490 out:
1491         return ret;
1492 }
1493
1494 static int __ipv6_dev_get_saddr(struct net *net,
1495                                 struct ipv6_saddr_dst *dst,
1496                                 struct inet6_dev *idev,
1497                                 struct ipv6_saddr_score *scores,
1498                                 int hiscore_idx)
1499 {
1500         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1501
1502         read_lock_bh(&idev->lock);
1503         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1504                 int i;
1505
1506                 /*
1507                  * - Tentative Address (RFC2462 section 5.4)
1508                  *  - A tentative address is not considered
1509                  *    "assigned to an interface" in the traditional
1510                  *    sense, unless it is also flagged as optimistic.
1511                  * - Candidate Source Address (section 4)
1512                  *  - In any case, anycast addresses, multicast
1513                  *    addresses, and the unspecified address MUST
1514                  *    NOT be included in a candidate set.
1515                  */
1516                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1517                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1518                         continue;
1519
1520                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1521
1522                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1523                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1524                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1525                                             idev->dev->name);
1526                         continue;
1527                 }
1528
1529                 score->rule = -1;
1530                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1531
1532                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1533                         int minihiscore, miniscore;
1534
1535                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1536                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1537
1538                         if (minihiscore > miniscore) {
1539                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1540                                     score->scopedist > 0) {
1541                                         /*
1542                                          * special case:
1543                                          * each remaining entry
1544                                          * has too small (not enough)
1545                                          * scope, because ifa entries
1546                                          * are sorted by their scope
1547                                          * values.
1548                                          */
1549                                         goto out;
1550                                 }
1551                                 break;
1552                         } else if (minihiscore < miniscore) {
1553                                 if (hiscore->ifa)
1554                                         in6_ifa_put(hiscore->ifa);
1555
1556                                 in6_ifa_hold(score->ifa);
1557
1558                                 swap(hiscore, score);
1559                                 hiscore_idx = 1 - hiscore_idx;
1560
1561                                 /* restore our iterator */
1562                                 score->ifa = hiscore->ifa;
1563
1564                                 break;
1565                         }
1566                 }
1567         }
1568 out:
1569         read_unlock_bh(&idev->lock);
1570         return hiscore_idx;
1571 }
1572
1573 static int ipv6_get_saddr_master(struct net *net,
1574                                  const struct net_device *dst_dev,
1575                                  const struct net_device *master,
1576                                  struct ipv6_saddr_dst *dst,
1577                                  struct ipv6_saddr_score *scores,
1578                                  int hiscore_idx)
1579 {
1580         struct inet6_dev *idev;
1581
1582         idev = __in6_dev_get(dst_dev);
1583         if (idev)
1584                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1585                                                    scores, hiscore_idx);
1586
1587         idev = __in6_dev_get(master);
1588         if (idev)
1589                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1590                                                    scores, hiscore_idx);
1591
1592         return hiscore_idx;
1593 }
1594
1595 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1596                        const struct in6_addr *daddr, unsigned int prefs,
1597                        struct in6_addr *saddr)
1598 {
1599         struct ipv6_saddr_score scores[2], *hiscore;
1600         struct ipv6_saddr_dst dst;
1601         struct inet6_dev *idev;
1602         struct net_device *dev;
1603         int dst_type;
1604         bool use_oif_addr = false;
1605         int hiscore_idx = 0;
1606
1607         dst_type = __ipv6_addr_type(daddr);
1608         dst.addr = daddr;
1609         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1610         dst.scope = __ipv6_addr_src_scope(dst_type);
1611         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1612         dst.prefs = prefs;
1613
1614         scores[hiscore_idx].rule = -1;
1615         scores[hiscore_idx].ifa = NULL;
1616
1617         rcu_read_lock();
1618
1619         /* Candidate Source Address (section 4)
1620          *  - multicast and link-local destination address,
1621          *    the set of candidate source address MUST only
1622          *    include addresses assigned to interfaces
1623          *    belonging to the same link as the outgoing
1624          *    interface.
1625          * (- For site-local destination addresses, the
1626          *    set of candidate source addresses MUST only
1627          *    include addresses assigned to interfaces
1628          *    belonging to the same site as the outgoing
1629          *    interface.)
1630          *  - "It is RECOMMENDED that the candidate source addresses
1631          *    be the set of unicast addresses assigned to the
1632          *    interface that will be used to send to the destination
1633          *    (the 'outgoing' interface)." (RFC 6724)
1634          */
1635         if (dst_dev) {
1636                 idev = __in6_dev_get(dst_dev);
1637                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1638                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1639                     (idev && idev->cnf.use_oif_addrs_only)) {
1640                         use_oif_addr = true;
1641                 }
1642         }
1643
1644         if (use_oif_addr) {
1645                 if (idev)
1646                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1647         } else {
1648                 const struct net_device *master;
1649                 int master_idx = 0;
1650
1651                 /* if dst_dev exists and is enslaved to an L3 device, then
1652                  * prefer addresses from dst_dev and then the master over
1653                  * any other enslaved devices in the L3 domain.
1654                  */
1655                 master = l3mdev_master_dev_rcu(dst_dev);
1656                 if (master) {
1657                         master_idx = master->ifindex;
1658
1659                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1660                                                             master, &dst,
1661                                                             scores, hiscore_idx);
1662
1663                         if (scores[hiscore_idx].ifa)
1664                                 goto out;
1665                 }
1666
1667                 for_each_netdev_rcu(net, dev) {
1668                         /* only consider addresses on devices in the
1669                          * same L3 domain
1670                          */
1671                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1672                                 continue;
1673                         idev = __in6_dev_get(dev);
1674                         if (!idev)
1675                                 continue;
1676                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1677                 }
1678         }
1679
1680 out:
1681         rcu_read_unlock();
1682
1683         hiscore = &scores[hiscore_idx];
1684         if (!hiscore->ifa)
1685                 return -EADDRNOTAVAIL;
1686
1687         *saddr = hiscore->ifa->addr;
1688         in6_ifa_put(hiscore->ifa);
1689         return 0;
1690 }
1691 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1692
1693 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1694                       u32 banned_flags)
1695 {
1696         struct inet6_ifaddr *ifp;
1697         int err = -EADDRNOTAVAIL;
1698
1699         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1700                 if (ifp->scope > IFA_LINK)
1701                         break;
1702                 if (ifp->scope == IFA_LINK &&
1703                     !(ifp->flags & banned_flags)) {
1704                         *addr = ifp->addr;
1705                         err = 0;
1706                         break;
1707                 }
1708         }
1709         return err;
1710 }
1711
1712 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1713                     u32 banned_flags)
1714 {
1715         struct inet6_dev *idev;
1716         int err = -EADDRNOTAVAIL;
1717
1718         rcu_read_lock();
1719         idev = __in6_dev_get(dev);
1720         if (idev) {
1721                 read_lock_bh(&idev->lock);
1722                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1723                 read_unlock_bh(&idev->lock);
1724         }
1725         rcu_read_unlock();
1726         return err;
1727 }
1728
1729 static int ipv6_count_addresses(struct inet6_dev *idev)
1730 {
1731         int cnt = 0;
1732         struct inet6_ifaddr *ifp;
1733
1734         read_lock_bh(&idev->lock);
1735         list_for_each_entry(ifp, &idev->addr_list, if_list)
1736                 cnt++;
1737         read_unlock_bh(&idev->lock);
1738         return cnt;
1739 }
1740
1741 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1742                   const struct net_device *dev, int strict)
1743 {
1744         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1745 }
1746 EXPORT_SYMBOL(ipv6_chk_addr);
1747
1748 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1749                             const struct net_device *dev, int strict,
1750                             u32 banned_flags)
1751 {
1752         struct inet6_ifaddr *ifp;
1753         unsigned int hash = inet6_addr_hash(addr);
1754         u32 ifp_flags;
1755
1756         rcu_read_lock_bh();
1757         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1758                 if (!net_eq(dev_net(ifp->idev->dev), net))
1759                         continue;
1760                 /* Decouple optimistic from tentative for evaluation here.
1761                  * Ban optimistic addresses explicitly, when required.
1762                  */
1763                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1764                             ? (ifp->flags&~IFA_F_TENTATIVE)
1765                             : ifp->flags;
1766                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1767                     !(ifp_flags&banned_flags) &&
1768                     (!dev || ifp->idev->dev == dev ||
1769                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1770                         rcu_read_unlock_bh();
1771                         return 1;
1772                 }
1773         }
1774
1775         rcu_read_unlock_bh();
1776         return 0;
1777 }
1778 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1779
1780 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1781                                struct net_device *dev)
1782 {
1783         unsigned int hash = inet6_addr_hash(addr);
1784         struct inet6_ifaddr *ifp;
1785
1786         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1787                 if (!net_eq(dev_net(ifp->idev->dev), net))
1788                         continue;
1789                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1790                         if (!dev || ifp->idev->dev == dev)
1791                                 return true;
1792                 }
1793         }
1794         return false;
1795 }
1796
1797 /* Compares an address/prefix_len with addresses on device @dev.
1798  * If one is found it returns true.
1799  */
1800 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1801         const unsigned int prefix_len, struct net_device *dev)
1802 {
1803         struct inet6_dev *idev;
1804         struct inet6_ifaddr *ifa;
1805         bool ret = false;
1806
1807         rcu_read_lock();
1808         idev = __in6_dev_get(dev);
1809         if (idev) {
1810                 read_lock_bh(&idev->lock);
1811                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1812                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1813                         if (ret)
1814                                 break;
1815                 }
1816                 read_unlock_bh(&idev->lock);
1817         }
1818         rcu_read_unlock();
1819
1820         return ret;
1821 }
1822 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1823
1824 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1825 {
1826         struct inet6_dev *idev;
1827         struct inet6_ifaddr *ifa;
1828         int     onlink;
1829
1830         onlink = 0;
1831         rcu_read_lock();
1832         idev = __in6_dev_get(dev);
1833         if (idev) {
1834                 read_lock_bh(&idev->lock);
1835                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1836                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1837                                                    ifa->prefix_len);
1838                         if (onlink)
1839                                 break;
1840                 }
1841                 read_unlock_bh(&idev->lock);
1842         }
1843         rcu_read_unlock();
1844         return onlink;
1845 }
1846 EXPORT_SYMBOL(ipv6_chk_prefix);
1847
1848 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1849                                      struct net_device *dev, int strict)
1850 {
1851         struct inet6_ifaddr *ifp, *result = NULL;
1852         unsigned int hash = inet6_addr_hash(addr);
1853
1854         rcu_read_lock_bh();
1855         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1856                 if (!net_eq(dev_net(ifp->idev->dev), net))
1857                         continue;
1858                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1859                         if (!dev || ifp->idev->dev == dev ||
1860                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1861                                 result = ifp;
1862                                 in6_ifa_hold(ifp);
1863                                 break;
1864                         }
1865                 }
1866         }
1867         rcu_read_unlock_bh();
1868
1869         return result;
1870 }
1871
1872 /* Gets referenced address, destroys ifaddr */
1873
1874 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1875 {
1876         if (dad_failed)
1877                 ifp->flags |= IFA_F_DADFAILED;
1878
1879         if (ifp->flags&IFA_F_PERMANENT) {
1880                 spin_lock_bh(&ifp->lock);
1881                 addrconf_del_dad_work(ifp);
1882                 ifp->flags |= IFA_F_TENTATIVE;
1883                 spin_unlock_bh(&ifp->lock);
1884                 if (dad_failed)
1885                         ipv6_ifa_notify(0, ifp);
1886                 in6_ifa_put(ifp);
1887         } else if (ifp->flags&IFA_F_TEMPORARY) {
1888                 struct inet6_ifaddr *ifpub;
1889                 spin_lock_bh(&ifp->lock);
1890                 ifpub = ifp->ifpub;
1891                 if (ifpub) {
1892                         in6_ifa_hold(ifpub);
1893                         spin_unlock_bh(&ifp->lock);
1894                         ipv6_create_tempaddr(ifpub, ifp);
1895                         in6_ifa_put(ifpub);
1896                 } else {
1897                         spin_unlock_bh(&ifp->lock);
1898                 }
1899                 ipv6_del_addr(ifp);
1900         } else {
1901                 ipv6_del_addr(ifp);
1902         }
1903 }
1904
1905 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1906 {
1907         int err = -ENOENT;
1908
1909         spin_lock_bh(&ifp->lock);
1910         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1911                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1912                 err = 0;
1913         }
1914         spin_unlock_bh(&ifp->lock);
1915
1916         return err;
1917 }
1918
1919 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1920 {
1921         struct inet6_dev *idev = ifp->idev;
1922         struct net *net = dev_net(ifp->idev->dev);
1923
1924         if (addrconf_dad_end(ifp)) {
1925                 in6_ifa_put(ifp);
1926                 return;
1927         }
1928
1929         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1930                              ifp->idev->dev->name, &ifp->addr);
1931
1932         spin_lock_bh(&ifp->lock);
1933
1934         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1935                 int scope = ifp->scope;
1936                 u32 flags = ifp->flags;
1937                 struct in6_addr new_addr;
1938                 struct inet6_ifaddr *ifp2;
1939                 u32 valid_lft, preferred_lft;
1940                 int pfxlen = ifp->prefix_len;
1941                 int retries = ifp->stable_privacy_retry + 1;
1942
1943                 if (retries > net->ipv6.sysctl.idgen_retries) {
1944                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1945                                              ifp->idev->dev->name);
1946                         goto errdad;
1947                 }
1948
1949                 new_addr = ifp->addr;
1950                 if (ipv6_generate_stable_address(&new_addr, retries,
1951                                                  idev))
1952                         goto errdad;
1953
1954                 valid_lft = ifp->valid_lft;
1955                 preferred_lft = ifp->prefered_lft;
1956
1957                 spin_unlock_bh(&ifp->lock);
1958
1959                 if (idev->cnf.max_addresses &&
1960                     ipv6_count_addresses(idev) >=
1961                     idev->cnf.max_addresses)
1962                         goto lock_errdad;
1963
1964                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1965                                      ifp->idev->dev->name);
1966
1967                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1968                                      scope, flags, valid_lft,
1969                                      preferred_lft);
1970                 if (IS_ERR(ifp2))
1971                         goto lock_errdad;
1972
1973                 spin_lock_bh(&ifp2->lock);
1974                 ifp2->stable_privacy_retry = retries;
1975                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1976                 spin_unlock_bh(&ifp2->lock);
1977
1978                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1979                 in6_ifa_put(ifp2);
1980 lock_errdad:
1981                 spin_lock_bh(&ifp->lock);
1982         }
1983
1984 errdad:
1985         /* transition from _POSTDAD to _ERRDAD */
1986         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1987         spin_unlock_bh(&ifp->lock);
1988
1989         addrconf_mod_dad_work(ifp, 0);
1990         in6_ifa_put(ifp);
1991 }
1992
1993 /* Join to solicited addr multicast group.
1994  * caller must hold RTNL */
1995 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1996 {
1997         struct in6_addr maddr;
1998
1999         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2000                 return;
2001
2002         addrconf_addr_solict_mult(addr, &maddr);
2003         ipv6_dev_mc_inc(dev, &maddr);
2004 }
2005
2006 /* caller must hold RTNL */
2007 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2008 {
2009         struct in6_addr maddr;
2010
2011         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2012                 return;
2013
2014         addrconf_addr_solict_mult(addr, &maddr);
2015         __ipv6_dev_mc_dec(idev, &maddr);
2016 }
2017
2018 /* caller must hold RTNL */
2019 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2020 {
2021         struct in6_addr addr;
2022
2023         if (ifp->prefix_len >= 127) /* RFC 6164 */
2024                 return;
2025         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2026         if (ipv6_addr_any(&addr))
2027                 return;
2028         __ipv6_dev_ac_inc(ifp->idev, &addr);
2029 }
2030
2031 /* caller must hold RTNL */
2032 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2033 {
2034         struct in6_addr addr;
2035
2036         if (ifp->prefix_len >= 127) /* RFC 6164 */
2037                 return;
2038         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2039         if (ipv6_addr_any(&addr))
2040                 return;
2041         __ipv6_dev_ac_dec(ifp->idev, &addr);
2042 }
2043
2044 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2045 {
2046         if (dev->addr_len != EUI64_ADDR_LEN)
2047                 return -1;
2048         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2049         eui[0] ^= 2;
2050         return 0;
2051 }
2052
2053 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2054 {
2055         union fwnet_hwaddr *ha;
2056
2057         if (dev->addr_len != FWNET_ALEN)
2058                 return -1;
2059
2060         ha = (union fwnet_hwaddr *)dev->dev_addr;
2061
2062         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2063         eui[0] ^= 2;
2064         return 0;
2065 }
2066
2067 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2068 {
2069         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2070         if (dev->addr_len != ARCNET_ALEN)
2071                 return -1;
2072         memset(eui, 0, 7);
2073         eui[7] = *(u8 *)dev->dev_addr;
2074         return 0;
2075 }
2076
2077 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2078 {
2079         if (dev->addr_len != INFINIBAND_ALEN)
2080                 return -1;
2081         memcpy(eui, dev->dev_addr + 12, 8);
2082         eui[0] |= 2;
2083         return 0;
2084 }
2085
2086 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2087 {
2088         if (addr == 0)
2089                 return -1;
2090         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2091                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2092                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2093                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2094                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2095                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2096         eui[1] = 0;
2097         eui[2] = 0x5E;
2098         eui[3] = 0xFE;
2099         memcpy(eui + 4, &addr, 4);
2100         return 0;
2101 }
2102
2103 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2104 {
2105         if (dev->priv_flags & IFF_ISATAP)
2106                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2107         return -1;
2108 }
2109
2110 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2111 {
2112         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2113 }
2114
2115 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2116 {
2117         memcpy(eui, dev->perm_addr, 3);
2118         memcpy(eui + 5, dev->perm_addr + 3, 3);
2119         eui[3] = 0xFF;
2120         eui[4] = 0xFE;
2121         eui[0] ^= 2;
2122         return 0;
2123 }
2124
2125 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2126 {
2127         switch (dev->type) {
2128         case ARPHRD_ETHER:
2129         case ARPHRD_FDDI:
2130                 return addrconf_ifid_eui48(eui, dev);
2131         case ARPHRD_ARCNET:
2132                 return addrconf_ifid_arcnet(eui, dev);
2133         case ARPHRD_INFINIBAND:
2134                 return addrconf_ifid_infiniband(eui, dev);
2135         case ARPHRD_SIT:
2136                 return addrconf_ifid_sit(eui, dev);
2137         case ARPHRD_IPGRE:
2138                 return addrconf_ifid_gre(eui, dev);
2139         case ARPHRD_6LOWPAN:
2140                 return addrconf_ifid_eui64(eui, dev);
2141         case ARPHRD_IEEE1394:
2142                 return addrconf_ifid_ieee1394(eui, dev);
2143         case ARPHRD_TUNNEL6:
2144                 return addrconf_ifid_ip6tnl(eui, dev);
2145         }
2146         return -1;
2147 }
2148
2149 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2150 {
2151         int err = -1;
2152         struct inet6_ifaddr *ifp;
2153
2154         read_lock_bh(&idev->lock);
2155         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2156                 if (ifp->scope > IFA_LINK)
2157                         break;
2158                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2159                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2160                         err = 0;
2161                         break;
2162                 }
2163         }
2164         read_unlock_bh(&idev->lock);
2165         return err;
2166 }
2167
2168 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2169 static void ipv6_regen_rndid(struct inet6_dev *idev)
2170 {
2171 regen:
2172         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2173         idev->rndid[0] &= ~0x02;
2174
2175         /*
2176          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2177          * check if generated address is not inappropriate
2178          *
2179          *  - Reserved subnet anycast (RFC 2526)
2180          *      11111101 11....11 1xxxxxxx
2181          *  - ISATAP (RFC4214) 6.1
2182          *      00-00-5E-FE-xx-xx-xx-xx
2183          *  - value 0
2184          *  - XXX: already assigned to an address on the device
2185          */
2186         if (idev->rndid[0] == 0xfd &&
2187             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2188             (idev->rndid[7]&0x80))
2189                 goto regen;
2190         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2191                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2192                         goto regen;
2193                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2194                         goto regen;
2195         }
2196 }
2197
2198 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2199 {
2200         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2201                 ipv6_regen_rndid(idev);
2202 }
2203
2204 /*
2205  *      Add prefix route.
2206  */
2207
2208 static void
2209 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2210                       unsigned long expires, u32 flags)
2211 {
2212         struct fib6_config cfg = {
2213                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2214                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2215                 .fc_ifindex = dev->ifindex,
2216                 .fc_expires = expires,
2217                 .fc_dst_len = plen,
2218                 .fc_flags = RTF_UP | flags,
2219                 .fc_nlinfo.nl_net = dev_net(dev),
2220                 .fc_protocol = RTPROT_KERNEL,
2221         };
2222
2223         cfg.fc_dst = *pfx;
2224
2225         /* Prevent useless cloning on PtP SIT.
2226            This thing is done here expecting that the whole
2227            class of non-broadcast devices need not cloning.
2228          */
2229 #if IS_ENABLED(CONFIG_IPV6_SIT)
2230         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2231                 cfg.fc_flags |= RTF_NONEXTHOP;
2232 #endif
2233
2234         ip6_route_add(&cfg);
2235 }
2236
2237
2238 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2239                                                   int plen,
2240                                                   const struct net_device *dev,
2241                                                   u32 flags, u32 noflags)
2242 {
2243         struct fib6_node *fn;
2244         struct rt6_info *rt = NULL;
2245         struct fib6_table *table;
2246         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2247
2248         table = fib6_get_table(dev_net(dev), tb_id);
2249         if (!table)
2250                 return NULL;
2251
2252         read_lock_bh(&table->tb6_lock);
2253         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2254         if (!fn)
2255                 goto out;
2256
2257         noflags |= RTF_CACHE;
2258         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2259                 if (rt->dst.dev->ifindex != dev->ifindex)
2260                         continue;
2261                 if ((rt->rt6i_flags & flags) != flags)
2262                         continue;
2263                 if ((rt->rt6i_flags & noflags) != 0)
2264                         continue;
2265                 dst_hold(&rt->dst);
2266                 break;
2267         }
2268 out:
2269         read_unlock_bh(&table->tb6_lock);
2270         return rt;
2271 }
2272
2273
2274 /* Create "default" multicast route to the interface */
2275
2276 static void addrconf_add_mroute(struct net_device *dev)
2277 {
2278         struct fib6_config cfg = {
2279                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2280                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2281                 .fc_ifindex = dev->ifindex,
2282                 .fc_dst_len = 8,
2283                 .fc_flags = RTF_UP,
2284                 .fc_nlinfo.nl_net = dev_net(dev),
2285         };
2286
2287         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2288
2289         ip6_route_add(&cfg);
2290 }
2291
2292 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2293 {
2294         struct inet6_dev *idev;
2295
2296         ASSERT_RTNL();
2297
2298         idev = ipv6_find_idev(dev);
2299         if (!idev)
2300                 return ERR_PTR(-ENOBUFS);
2301
2302         if (idev->cnf.disable_ipv6)
2303                 return ERR_PTR(-EACCES);
2304
2305         /* Add default multicast route */
2306         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2307                 addrconf_add_mroute(dev);
2308
2309         return idev;
2310 }
2311
2312 static void manage_tempaddrs(struct inet6_dev *idev,
2313                              struct inet6_ifaddr *ifp,
2314                              __u32 valid_lft, __u32 prefered_lft,
2315                              bool create, unsigned long now)
2316 {
2317         u32 flags;
2318         struct inet6_ifaddr *ift;
2319
2320         read_lock_bh(&idev->lock);
2321         /* update all temporary addresses in the list */
2322         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2323                 int age, max_valid, max_prefered;
2324
2325                 if (ifp != ift->ifpub)
2326                         continue;
2327
2328                 /* RFC 4941 section 3.3:
2329                  * If a received option will extend the lifetime of a public
2330                  * address, the lifetimes of temporary addresses should
2331                  * be extended, subject to the overall constraint that no
2332                  * temporary addresses should ever remain "valid" or "preferred"
2333                  * for a time longer than (TEMP_VALID_LIFETIME) or
2334                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2335                  */
2336                 age = (now - ift->cstamp) / HZ;
2337                 max_valid = idev->cnf.temp_valid_lft - age;
2338                 if (max_valid < 0)
2339                         max_valid = 0;
2340
2341                 max_prefered = idev->cnf.temp_prefered_lft -
2342                                idev->desync_factor - age;
2343                 if (max_prefered < 0)
2344                         max_prefered = 0;
2345
2346                 if (valid_lft > max_valid)
2347                         valid_lft = max_valid;
2348
2349                 if (prefered_lft > max_prefered)
2350                         prefered_lft = max_prefered;
2351
2352                 spin_lock(&ift->lock);
2353                 flags = ift->flags;
2354                 ift->valid_lft = valid_lft;
2355                 ift->prefered_lft = prefered_lft;
2356                 ift->tstamp = now;
2357                 if (prefered_lft > 0)
2358                         ift->flags &= ~IFA_F_DEPRECATED;
2359
2360                 spin_unlock(&ift->lock);
2361                 if (!(flags&IFA_F_TENTATIVE))
2362                         ipv6_ifa_notify(0, ift);
2363         }
2364
2365         if ((create || list_empty(&idev->tempaddr_list)) &&
2366             idev->cnf.use_tempaddr > 0) {
2367                 /* When a new public address is created as described
2368                  * in [ADDRCONF], also create a new temporary address.
2369                  * Also create a temporary address if it's enabled but
2370                  * no temporary address currently exists.
2371                  */
2372                 read_unlock_bh(&idev->lock);
2373                 ipv6_create_tempaddr(ifp, NULL);
2374         } else {
2375                 read_unlock_bh(&idev->lock);
2376         }
2377 }
2378
2379 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2380 {
2381         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2382                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2383 }
2384
2385 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2386                                  const struct prefix_info *pinfo,
2387                                  struct inet6_dev *in6_dev,
2388                                  const struct in6_addr *addr, int addr_type,
2389                                  u32 addr_flags, bool sllao, bool tokenized,
2390                                  __u32 valid_lft, u32 prefered_lft)
2391 {
2392         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2393         int create = 0, update_lft = 0;
2394
2395         if (!ifp && valid_lft) {
2396                 int max_addresses = in6_dev->cnf.max_addresses;
2397
2398 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2399                 if (in6_dev->cnf.optimistic_dad &&
2400                     !net->ipv6.devconf_all->forwarding && sllao)
2401                         addr_flags |= IFA_F_OPTIMISTIC;
2402 #endif
2403
2404                 /* Do not allow to create too much of autoconfigured
2405                  * addresses; this would be too easy way to crash kernel.
2406                  */
2407                 if (!max_addresses ||
2408                     ipv6_count_addresses(in6_dev) < max_addresses)
2409                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2410                                             pinfo->prefix_len,
2411                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2412                                             addr_flags, valid_lft,
2413                                             prefered_lft);
2414
2415                 if (IS_ERR_OR_NULL(ifp))
2416                         return -1;
2417
2418                 update_lft = 0;
2419                 create = 1;
2420                 spin_lock_bh(&ifp->lock);
2421                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2422                 ifp->cstamp = jiffies;
2423                 ifp->tokenized = tokenized;
2424                 spin_unlock_bh(&ifp->lock);
2425                 addrconf_dad_start(ifp);
2426         }
2427
2428         if (ifp) {
2429                 u32 flags;
2430                 unsigned long now;
2431                 u32 stored_lft;
2432
2433                 /* update lifetime (RFC2462 5.5.3 e) */
2434                 spin_lock_bh(&ifp->lock);
2435                 now = jiffies;
2436                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2437                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2438                 else
2439                         stored_lft = 0;
2440                 if (!update_lft && !create && stored_lft) {
2441                         const u32 minimum_lft = min_t(u32,
2442                                 stored_lft, MIN_VALID_LIFETIME);
2443                         valid_lft = max(valid_lft, minimum_lft);
2444
2445                         /* RFC4862 Section 5.5.3e:
2446                          * "Note that the preferred lifetime of the
2447                          *  corresponding address is always reset to
2448                          *  the Preferred Lifetime in the received
2449                          *  Prefix Information option, regardless of
2450                          *  whether the valid lifetime is also reset or
2451                          *  ignored."
2452                          *
2453                          * So we should always update prefered_lft here.
2454                          */
2455                         update_lft = 1;
2456                 }
2457
2458                 if (update_lft) {
2459                         ifp->valid_lft = valid_lft;
2460                         ifp->prefered_lft = prefered_lft;
2461                         ifp->tstamp = now;
2462                         flags = ifp->flags;
2463                         ifp->flags &= ~IFA_F_DEPRECATED;
2464                         spin_unlock_bh(&ifp->lock);
2465
2466                         if (!(flags&IFA_F_TENTATIVE))
2467                                 ipv6_ifa_notify(0, ifp);
2468                 } else
2469                         spin_unlock_bh(&ifp->lock);
2470
2471                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2472                                  create, now);
2473
2474                 in6_ifa_put(ifp);
2475                 addrconf_verify();
2476         }
2477
2478         return 0;
2479 }
2480 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2481
2482 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2483 {
2484         struct prefix_info *pinfo;
2485         __u32 valid_lft;
2486         __u32 prefered_lft;
2487         int addr_type, err;
2488         u32 addr_flags = 0;
2489         struct inet6_dev *in6_dev;
2490         struct net *net = dev_net(dev);
2491
2492         pinfo = (struct prefix_info *) opt;
2493
2494         if (len < sizeof(struct prefix_info)) {
2495                 ADBG("addrconf: prefix option too short\n");
2496                 return;
2497         }
2498
2499         /*
2500          *      Validation checks ([ADDRCONF], page 19)
2501          */
2502
2503         addr_type = ipv6_addr_type(&pinfo->prefix);
2504
2505         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2506                 return;
2507
2508         valid_lft = ntohl(pinfo->valid);
2509         prefered_lft = ntohl(pinfo->prefered);
2510
2511         if (prefered_lft > valid_lft) {
2512                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2513                 return;
2514         }
2515
2516         in6_dev = in6_dev_get(dev);
2517
2518         if (!in6_dev) {
2519                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2520                                     dev->name);
2521                 return;
2522         }
2523
2524         /*
2525          *      Two things going on here:
2526          *      1) Add routes for on-link prefixes
2527          *      2) Configure prefixes with the auto flag set
2528          */
2529
2530         if (pinfo->onlink) {
2531                 struct rt6_info *rt;
2532                 unsigned long rt_expires;
2533
2534                 /* Avoid arithmetic overflow. Really, we could
2535                  * save rt_expires in seconds, likely valid_lft,
2536                  * but it would require division in fib gc, that it
2537                  * not good.
2538                  */
2539                 if (HZ > USER_HZ)
2540                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2541                 else
2542                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2543
2544                 if (addrconf_finite_timeout(rt_expires))
2545                         rt_expires *= HZ;
2546
2547                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2548                                                pinfo->prefix_len,
2549                                                dev,
2550                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2551                                                RTF_GATEWAY | RTF_DEFAULT);
2552
2553                 if (rt) {
2554                         /* Autoconf prefix route */
2555                         if (valid_lft == 0) {
2556                                 ip6_del_rt(rt);
2557                                 rt = NULL;
2558                         } else if (addrconf_finite_timeout(rt_expires)) {
2559                                 /* not infinity */
2560                                 rt6_set_expires(rt, jiffies + rt_expires);
2561                         } else {
2562                                 rt6_clean_expires(rt);
2563                         }
2564                 } else if (valid_lft) {
2565                         clock_t expires = 0;
2566                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2567                         if (addrconf_finite_timeout(rt_expires)) {
2568                                 /* not infinity */
2569                                 flags |= RTF_EXPIRES;
2570                                 expires = jiffies_to_clock_t(rt_expires);
2571                         }
2572                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2573                                               dev, expires, flags);
2574                 }
2575                 ip6_rt_put(rt);
2576         }
2577
2578         /* Try to figure out our local address for this prefix */
2579
2580         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2581                 struct in6_addr addr;
2582                 bool tokenized = false, dev_addr_generated = false;
2583
2584                 if (pinfo->prefix_len == 64) {
2585                         memcpy(&addr, &pinfo->prefix, 8);
2586
2587                         if (!ipv6_addr_any(&in6_dev->token)) {
2588                                 read_lock_bh(&in6_dev->lock);
2589                                 memcpy(addr.s6_addr + 8,
2590                                        in6_dev->token.s6_addr + 8, 8);
2591                                 read_unlock_bh(&in6_dev->lock);
2592                                 tokenized = true;
2593                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2594                                    !ipv6_generate_stable_address(&addr, 0,
2595                                                                  in6_dev)) {
2596                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2597                                 goto ok;
2598                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2599                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2600                                 goto put;
2601                         } else {
2602                                 dev_addr_generated = true;
2603                         }
2604                         goto ok;
2605                 }
2606                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2607                                     pinfo->prefix_len);
2608                 goto put;
2609
2610 ok:
2611                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2612                                                    &addr, addr_type,
2613                                                    addr_flags, sllao,
2614                                                    tokenized, valid_lft,
2615                                                    prefered_lft);
2616                 if (err)
2617                         goto put;
2618
2619                 /* Ignore error case here because previous prefix add addr was
2620                  * successful which will be notified.
2621                  */
2622                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2623                                               addr_type, addr_flags, sllao,
2624                                               tokenized, valid_lft,
2625                                               prefered_lft,
2626                                               dev_addr_generated);
2627         }
2628         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2629 put:
2630         in6_dev_put(in6_dev);
2631 }
2632
2633 /*
2634  *      Set destination address.
2635  *      Special case for SIT interfaces where we create a new "virtual"
2636  *      device.
2637  */
2638 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2639 {
2640         struct in6_ifreq ireq;
2641         struct net_device *dev;
2642         int err = -EINVAL;
2643
2644         rtnl_lock();
2645
2646         err = -EFAULT;
2647         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2648                 goto err_exit;
2649
2650         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2651
2652         err = -ENODEV;
2653         if (!dev)
2654                 goto err_exit;
2655
2656 #if IS_ENABLED(CONFIG_IPV6_SIT)
2657         if (dev->type == ARPHRD_SIT) {
2658                 const struct net_device_ops *ops = dev->netdev_ops;
2659                 struct ifreq ifr;
2660                 struct ip_tunnel_parm p;
2661
2662                 err = -EADDRNOTAVAIL;
2663                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2664                         goto err_exit;
2665
2666                 memset(&p, 0, sizeof(p));
2667                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2668                 p.iph.saddr = 0;
2669                 p.iph.version = 4;
2670                 p.iph.ihl = 5;
2671                 p.iph.protocol = IPPROTO_IPV6;
2672                 p.iph.ttl = 64;
2673                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2674
2675                 if (ops->ndo_do_ioctl) {
2676                         mm_segment_t oldfs = get_fs();
2677
2678                         set_fs(KERNEL_DS);
2679                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2680                         set_fs(oldfs);
2681                 } else
2682                         err = -EOPNOTSUPP;
2683
2684                 if (err == 0) {
2685                         err = -ENOBUFS;
2686                         dev = __dev_get_by_name(net, p.name);
2687                         if (!dev)
2688                                 goto err_exit;
2689                         err = dev_open(dev);
2690                 }
2691         }
2692 #endif
2693
2694 err_exit:
2695         rtnl_unlock();
2696         return err;
2697 }
2698
2699 static int ipv6_mc_config(struct sock *sk, bool join,
2700                           const struct in6_addr *addr, int ifindex)
2701 {
2702         int ret;
2703
2704         ASSERT_RTNL();
2705
2706         lock_sock(sk);
2707         if (join)
2708                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2709         else
2710                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2711         release_sock(sk);
2712
2713         return ret;
2714 }
2715
2716 /*
2717  *      Manual configuration of address on an interface
2718  */
2719 static int inet6_addr_add(struct net *net, int ifindex,
2720                           const struct in6_addr *pfx,
2721                           const struct in6_addr *peer_pfx,
2722                           unsigned int plen, __u32 ifa_flags,
2723                           __u32 prefered_lft, __u32 valid_lft)
2724 {
2725         struct inet6_ifaddr *ifp;
2726         struct inet6_dev *idev;
2727         struct net_device *dev;
2728         unsigned long timeout;
2729         clock_t expires;
2730         int scope;
2731         u32 flags;
2732
2733         ASSERT_RTNL();
2734
2735         if (plen > 128)
2736                 return -EINVAL;
2737
2738         /* check the lifetime */
2739         if (!valid_lft || prefered_lft > valid_lft)
2740                 return -EINVAL;
2741
2742         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2743                 return -EINVAL;
2744
2745         dev = __dev_get_by_index(net, ifindex);
2746         if (!dev)
2747                 return -ENODEV;
2748
2749         idev = addrconf_add_dev(dev);
2750         if (IS_ERR(idev))
2751                 return PTR_ERR(idev);
2752
2753         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2754                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2755                                          true, pfx, ifindex);
2756
2757                 if (ret < 0)
2758                         return ret;
2759         }
2760
2761         scope = ipv6_addr_scope(pfx);
2762
2763         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2764         if (addrconf_finite_timeout(timeout)) {
2765                 expires = jiffies_to_clock_t(timeout * HZ);
2766                 valid_lft = timeout;
2767                 flags = RTF_EXPIRES;
2768         } else {
2769                 expires = 0;
2770                 flags = 0;
2771                 ifa_flags |= IFA_F_PERMANENT;
2772         }
2773
2774         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2775         if (addrconf_finite_timeout(timeout)) {
2776                 if (timeout == 0)
2777                         ifa_flags |= IFA_F_DEPRECATED;
2778                 prefered_lft = timeout;
2779         }
2780
2781         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2782                             valid_lft, prefered_lft);
2783
2784         if (!IS_ERR(ifp)) {
2785                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2786                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2787                                               expires, flags);
2788                 }
2789
2790                 /*
2791                  * Note that section 3.1 of RFC 4429 indicates
2792                  * that the Optimistic flag should not be set for
2793                  * manually configured addresses
2794                  */
2795                 addrconf_dad_start(ifp);
2796                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2797                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2798                                          true, jiffies);
2799                 in6_ifa_put(ifp);
2800                 addrconf_verify_rtnl();
2801                 return 0;
2802         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2803                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2804                                false, pfx, ifindex);
2805         }
2806
2807         return PTR_ERR(ifp);
2808 }
2809
2810 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2811                           const struct in6_addr *pfx, unsigned int plen)
2812 {
2813         struct inet6_ifaddr *ifp;
2814         struct inet6_dev *idev;
2815         struct net_device *dev;
2816
2817         if (plen > 128)
2818                 return -EINVAL;
2819
2820         dev = __dev_get_by_index(net, ifindex);
2821         if (!dev)
2822                 return -ENODEV;
2823
2824         idev = __in6_dev_get(dev);
2825         if (!idev)
2826                 return -ENXIO;
2827
2828         read_lock_bh(&idev->lock);
2829         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2830                 if (ifp->prefix_len == plen &&
2831                     ipv6_addr_equal(pfx, &ifp->addr)) {
2832                         in6_ifa_hold(ifp);
2833                         read_unlock_bh(&idev->lock);
2834
2835                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2836                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2837                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2838                                                  jiffies);
2839                         ipv6_del_addr(ifp);
2840                         addrconf_verify_rtnl();
2841                         if (ipv6_addr_is_multicast(pfx)) {
2842                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2843                                                false, pfx, dev->ifindex);
2844                         }
2845                         return 0;
2846                 }
2847         }
2848         read_unlock_bh(&idev->lock);
2849         return -EADDRNOTAVAIL;
2850 }
2851
2852
2853 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2854 {
2855         struct in6_ifreq ireq;
2856         int err;
2857
2858         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2859                 return -EPERM;
2860
2861         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2862                 return -EFAULT;
2863
2864         rtnl_lock();
2865         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2866                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2867                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2868         rtnl_unlock();
2869         return err;
2870 }
2871
2872 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2873 {
2874         struct in6_ifreq ireq;
2875         int err;
2876
2877         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2878                 return -EPERM;
2879
2880         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2881                 return -EFAULT;
2882
2883         rtnl_lock();
2884         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2885                              ireq.ifr6_prefixlen);
2886         rtnl_unlock();
2887         return err;
2888 }
2889
2890 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2891                      int plen, int scope)
2892 {
2893         struct inet6_ifaddr *ifp;
2894
2895         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2896                             scope, IFA_F_PERMANENT,
2897                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2898         if (!IS_ERR(ifp)) {
2899                 spin_lock_bh(&ifp->lock);
2900                 ifp->flags &= ~IFA_F_TENTATIVE;
2901                 spin_unlock_bh(&ifp->lock);
2902                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2903                 in6_ifa_put(ifp);
2904         }
2905 }
2906
2907 #if IS_ENABLED(CONFIG_IPV6_SIT)
2908 static void sit_add_v4_addrs(struct inet6_dev *idev)
2909 {
2910         struct in6_addr addr;
2911         struct net_device *dev;
2912         struct net *net = dev_net(idev->dev);
2913         int scope, plen;
2914         u32 pflags = 0;
2915
2916         ASSERT_RTNL();
2917
2918         memset(&addr, 0, sizeof(struct in6_addr));
2919         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2920
2921         if (idev->dev->flags&IFF_POINTOPOINT) {
2922                 addr.s6_addr32[0] = htonl(0xfe800000);
2923                 scope = IFA_LINK;
2924                 plen = 64;
2925         } else {
2926                 scope = IPV6_ADDR_COMPATv4;
2927                 plen = 96;
2928                 pflags |= RTF_NONEXTHOP;
2929         }
2930
2931         if (addr.s6_addr32[3]) {
2932                 add_addr(idev, &addr, plen, scope);
2933                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2934                 return;
2935         }
2936
2937         for_each_netdev(net, dev) {
2938                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2939                 if (in_dev && (dev->flags & IFF_UP)) {
2940                         struct in_ifaddr *ifa;
2941
2942                         int flag = scope;
2943
2944                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2945
2946                                 addr.s6_addr32[3] = ifa->ifa_local;
2947
2948                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2949                                         continue;
2950                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2951                                         if (idev->dev->flags&IFF_POINTOPOINT)
2952                                                 continue;
2953                                         flag |= IFA_HOST;
2954                                 }
2955
2956                                 add_addr(idev, &addr, plen, flag);
2957                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2958                                                       pflags);
2959                         }
2960                 }
2961         }
2962 }
2963 #endif
2964
2965 static void init_loopback(struct net_device *dev)
2966 {
2967         struct inet6_dev  *idev;
2968         struct net_device *sp_dev;
2969         struct inet6_ifaddr *sp_ifa;
2970         struct rt6_info *sp_rt;
2971
2972         /* ::1 */
2973
2974         ASSERT_RTNL();
2975
2976         idev = ipv6_find_idev(dev);
2977         if (!idev) {
2978                 pr_debug("%s: add_dev failed\n", __func__);
2979                 return;
2980         }
2981
2982         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2983
2984         /* Add routes to other interface's IPv6 addresses */
2985         for_each_netdev(dev_net(dev), sp_dev) {
2986                 if (!strcmp(sp_dev->name, dev->name))
2987                         continue;
2988
2989                 idev = __in6_dev_get(sp_dev);
2990                 if (!idev)
2991                         continue;
2992
2993                 read_lock_bh(&idev->lock);
2994                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2995
2996                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2997                                 continue;
2998
2999                         if (sp_ifa->rt) {
3000                                 /* This dst has been added to garbage list when
3001                                  * lo device down, release this obsolete dst and
3002                                  * reallocate a new router for ifa.
3003                                  */
3004                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3005                                         ip6_rt_put(sp_ifa->rt);
3006                                         sp_ifa->rt = NULL;
3007                                 } else {
3008                                         continue;
3009                                 }
3010                         }
3011
3012                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3013
3014                         /* Failure cases are ignored */
3015                         if (!IS_ERR(sp_rt)) {
3016                                 sp_ifa->rt = sp_rt;
3017                                 ip6_ins_rt(sp_rt);
3018                         }
3019                 }
3020                 read_unlock_bh(&idev->lock);
3021         }
3022 }
3023
3024 void addrconf_add_linklocal(struct inet6_dev *idev,
3025                             const struct in6_addr *addr, u32 flags)
3026 {
3027         struct inet6_ifaddr *ifp;
3028         u32 addr_flags = flags | IFA_F_PERMANENT;
3029
3030 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3031         if (idev->cnf.optimistic_dad &&
3032             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3033                 addr_flags |= IFA_F_OPTIMISTIC;
3034 #endif
3035
3036         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3037                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3038         if (!IS_ERR(ifp)) {
3039                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3040                 addrconf_dad_start(ifp);
3041                 in6_ifa_put(ifp);
3042         }
3043 }
3044 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3045
3046 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3047 {
3048         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3049                 return true;
3050
3051         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3052             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3053                 return true;
3054
3055         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3056             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3057                 return true;
3058
3059         return false;
3060 }
3061
3062 static int ipv6_generate_stable_address(struct in6_addr *address,
3063                                         u8 dad_count,
3064                                         const struct inet6_dev *idev)
3065 {
3066         static DEFINE_SPINLOCK(lock);
3067         static __u32 digest[SHA_DIGEST_WORDS];
3068         static __u32 workspace[SHA_WORKSPACE_WORDS];
3069
3070         static union {
3071                 char __data[SHA_MESSAGE_BYTES];
3072                 struct {
3073                         struct in6_addr secret;
3074                         __be32 prefix[2];
3075                         unsigned char hwaddr[MAX_ADDR_LEN];
3076                         u8 dad_count;
3077                 } __packed;
3078         } data;
3079
3080         struct in6_addr secret;
3081         struct in6_addr temp;
3082         struct net *net = dev_net(idev->dev);
3083
3084         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3085
3086         if (idev->cnf.stable_secret.initialized)
3087                 secret = idev->cnf.stable_secret.secret;
3088         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3089                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3090         else
3091                 return -1;
3092
3093 retry:
3094         spin_lock_bh(&lock);
3095
3096         sha_init(digest);
3097         memset(&data, 0, sizeof(data));
3098         memset(workspace, 0, sizeof(workspace));
3099         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3100         data.prefix[0] = address->s6_addr32[0];
3101         data.prefix[1] = address->s6_addr32[1];
3102         data.secret = secret;
3103         data.dad_count = dad_count;
3104
3105         sha_transform(digest, data.__data, workspace);
3106
3107         temp = *address;
3108         temp.s6_addr32[2] = (__force __be32)digest[0];
3109         temp.s6_addr32[3] = (__force __be32)digest[1];
3110
3111         spin_unlock_bh(&lock);
3112
3113         if (ipv6_reserved_interfaceid(temp)) {
3114                 dad_count++;
3115                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3116                         return -1;
3117                 goto retry;
3118         }
3119
3120         *address = temp;
3121         return 0;
3122 }
3123
3124 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3125 {
3126         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3127
3128         if (s->initialized)
3129                 return;
3130         s = &idev->cnf.stable_secret;
3131         get_random_bytes(&s->secret, sizeof(s->secret));
3132         s->initialized = true;
3133 }
3134
3135 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3136 {
3137         struct in6_addr addr;
3138
3139         /* no link local addresses on L3 master devices */
3140         if (netif_is_l3_master(idev->dev))
3141                 return;
3142
3143         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3144
3145         switch (idev->addr_gen_mode) {
3146         case IN6_ADDR_GEN_MODE_RANDOM:
3147                 ipv6_gen_mode_random_init(idev);
3148                 /* fallthrough */
3149         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3150                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3151                         addrconf_add_linklocal(idev, &addr,
3152                                                IFA_F_STABLE_PRIVACY);
3153                 else if (prefix_route)
3154                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3155                 break;
3156         case IN6_ADDR_GEN_MODE_EUI64:
3157                 /* addrconf_add_linklocal also adds a prefix_route and we
3158                  * only need to care about prefix routes if ipv6_generate_eui64
3159                  * couldn't generate one.
3160                  */
3161                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3162                         addrconf_add_linklocal(idev, &addr, 0);
3163                 else if (prefix_route)
3164                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3165                 break;
3166         case IN6_ADDR_GEN_MODE_NONE:
3167         default:
3168                 /* will not add any link local address */
3169                 break;
3170         }
3171 }
3172
3173 static void addrconf_dev_config(struct net_device *dev)
3174 {
3175         struct inet6_dev *idev;
3176
3177         ASSERT_RTNL();
3178
3179         if ((dev->type != ARPHRD_ETHER) &&
3180             (dev->type != ARPHRD_FDDI) &&
3181             (dev->type != ARPHRD_ARCNET) &&
3182             (dev->type != ARPHRD_INFINIBAND) &&
3183             (dev->type != ARPHRD_IEEE1394) &&
3184             (dev->type != ARPHRD_TUNNEL6) &&
3185             (dev->type != ARPHRD_6LOWPAN) &&
3186             (dev->type != ARPHRD_NONE)) {
3187                 /* Alas, we support only Ethernet autoconfiguration. */
3188                 return;
3189         }
3190
3191         idev = addrconf_add_dev(dev);
3192         if (IS_ERR(idev))
3193                 return;
3194
3195         /* this device type has no EUI support */
3196         if (dev->type == ARPHRD_NONE &&
3197             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3198                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3199
3200         addrconf_addr_gen(idev, false);
3201 }
3202
3203 #if IS_ENABLED(CONFIG_IPV6_SIT)
3204 static void addrconf_sit_config(struct net_device *dev)
3205 {
3206         struct inet6_dev *idev;
3207
3208         ASSERT_RTNL();
3209
3210         /*
3211          * Configure the tunnel with one of our IPv4
3212          * addresses... we should configure all of
3213          * our v4 addrs in the tunnel
3214          */
3215
3216         idev = ipv6_find_idev(dev);
3217         if (!idev) {
3218                 pr_debug("%s: add_dev failed\n", __func__);
3219                 return;
3220         }
3221
3222         if (dev->priv_flags & IFF_ISATAP) {
3223                 addrconf_addr_gen(idev, false);
3224                 return;
3225         }
3226
3227         sit_add_v4_addrs(idev);
3228
3229         if (dev->flags&IFF_POINTOPOINT)
3230                 addrconf_add_mroute(dev);
3231 }
3232 #endif
3233
3234 #if IS_ENABLED(CONFIG_NET_IPGRE)
3235 static void addrconf_gre_config(struct net_device *dev)
3236 {
3237         struct inet6_dev *idev;
3238
3239         ASSERT_RTNL();
3240
3241         idev = ipv6_find_idev(dev);
3242         if (!idev) {
3243                 pr_debug("%s: add_dev failed\n", __func__);
3244                 return;
3245         }
3246
3247         addrconf_addr_gen(idev, true);
3248         if (dev->flags & IFF_POINTOPOINT)
3249                 addrconf_add_mroute(dev);
3250 }
3251 #endif
3252
3253 static int fixup_permanent_addr(struct inet6_dev *idev,
3254                                 struct inet6_ifaddr *ifp)
3255 {
3256         if (!ifp->rt) {
3257                 struct rt6_info *rt;
3258
3259                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3260                 if (unlikely(IS_ERR(rt)))
3261                         return PTR_ERR(rt);
3262
3263                 ifp->rt = rt;
3264         }
3265
3266         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3267                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3268                                       idev->dev, 0, 0);
3269         }
3270
3271         addrconf_dad_start(ifp);
3272
3273         return 0;
3274 }
3275
3276 static void addrconf_permanent_addr(struct net_device *dev)
3277 {
3278         struct inet6_ifaddr *ifp, *tmp;
3279         struct inet6_dev *idev;
3280
3281         idev = __in6_dev_get(dev);
3282         if (!idev)
3283                 return;
3284
3285         write_lock_bh(&idev->lock);
3286
3287         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3288                 if ((ifp->flags & IFA_F_PERMANENT) &&
3289                     fixup_permanent_addr(idev, ifp) < 0) {
3290                         write_unlock_bh(&idev->lock);
3291                         ipv6_del_addr(ifp);
3292                         write_lock_bh(&idev->lock);
3293
3294                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3295                                              idev->dev->name, &ifp->addr);
3296                 }
3297         }
3298
3299         write_unlock_bh(&idev->lock);
3300 }
3301
3302 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3303                            void *ptr)
3304 {
3305         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3306         struct netdev_notifier_changeupper_info *info;
3307         struct inet6_dev *idev = __in6_dev_get(dev);
3308         int run_pending = 0;
3309         int err;
3310
3311         switch (event) {
3312         case NETDEV_REGISTER:
3313                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3314                         idev = ipv6_add_dev(dev);
3315                         if (IS_ERR(idev))
3316                                 return notifier_from_errno(PTR_ERR(idev));
3317                 }
3318                 break;
3319
3320         case NETDEV_CHANGEMTU:
3321                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3322                 if (dev->mtu < IPV6_MIN_MTU) {
3323                         addrconf_ifdown(dev, 1);
3324                         break;
3325                 }
3326
3327                 if (idev) {
3328                         rt6_mtu_change(dev, dev->mtu);
3329                         idev->cnf.mtu6 = dev->mtu;
3330                         break;
3331                 }
3332
3333                 /* allocate new idev */
3334                 idev = ipv6_add_dev(dev);
3335                 if (IS_ERR(idev))
3336                         break;
3337
3338                 /* device is still not ready */
3339                 if (!(idev->if_flags & IF_READY))
3340                         break;
3341
3342                 run_pending = 1;
3343
3344                 /* fall through */
3345
3346         case NETDEV_UP:
3347         case NETDEV_CHANGE:
3348                 if (dev->flags & IFF_SLAVE)
3349                         break;
3350
3351                 if (idev && idev->cnf.disable_ipv6)
3352                         break;
3353
3354                 if (event == NETDEV_UP) {
3355                         /* restore routes for permanent addresses */
3356                         addrconf_permanent_addr(dev);
3357
3358                         if (!addrconf_qdisc_ok(dev)) {
3359                                 /* device is not ready yet. */
3360                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3361                                         dev->name);
3362                                 break;
3363                         }
3364
3365                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3366                                 idev = ipv6_add_dev(dev);
3367
3368                         if (!IS_ERR_OR_NULL(idev)) {
3369                                 idev->if_flags |= IF_READY;
3370                                 run_pending = 1;
3371                         }
3372                 } else if (event == NETDEV_CHANGE) {
3373                         if (!addrconf_qdisc_ok(dev)) {
3374                                 /* device is still not ready. */
3375                                 break;
3376                         }
3377
3378                         if (idev) {
3379                                 if (idev->if_flags & IF_READY)
3380                                         /* device is already configured. */
3381                                         break;
3382                                 idev->if_flags |= IF_READY;
3383                         }
3384
3385                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3386                                 dev->name);
3387
3388                         run_pending = 1;
3389                 }
3390
3391                 switch (dev->type) {
3392 #if IS_ENABLED(CONFIG_IPV6_SIT)
3393                 case ARPHRD_SIT:
3394                         addrconf_sit_config(dev);
3395                         break;
3396 #endif
3397 #if IS_ENABLED(CONFIG_NET_IPGRE)
3398                 case ARPHRD_IPGRE:
3399                         addrconf_gre_config(dev);
3400                         break;
3401 #endif
3402                 case ARPHRD_LOOPBACK:
3403                         init_loopback(dev);
3404                         break;
3405
3406                 default:
3407                         addrconf_dev_config(dev);
3408                         break;
3409                 }
3410
3411                 if (!IS_ERR_OR_NULL(idev)) {
3412                         if (run_pending)
3413                                 addrconf_dad_run(idev);
3414
3415                         /*
3416                          * If the MTU changed during the interface down,
3417                          * when the interface up, the changed MTU must be
3418                          * reflected in the idev as well as routers.
3419                          */
3420                         if (idev->cnf.mtu6 != dev->mtu &&
3421                             dev->mtu >= IPV6_MIN_MTU) {
3422                                 rt6_mtu_change(dev, dev->mtu);
3423                                 idev->cnf.mtu6 = dev->mtu;
3424                         }
3425                         idev->tstamp = jiffies;
3426                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3427
3428                         /*
3429                          * If the changed mtu during down is lower than
3430                          * IPV6_MIN_MTU stop IPv6 on this interface.
3431                          */
3432                         if (dev->mtu < IPV6_MIN_MTU)
3433                                 addrconf_ifdown(dev, 1);
3434                 }
3435                 break;
3436
3437         case NETDEV_DOWN:
3438         case NETDEV_UNREGISTER:
3439                 /*
3440                  *      Remove all addresses from this interface.
3441                  */
3442                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3443                 break;
3444
3445         case NETDEV_CHANGENAME:
3446                 if (idev) {
3447                         snmp6_unregister_dev(idev);
3448                         addrconf_sysctl_unregister(idev);
3449                         err = addrconf_sysctl_register(idev);
3450                         if (err)
3451                                 return notifier_from_errno(err);
3452                         err = snmp6_register_dev(idev);
3453                         if (err) {
3454                                 addrconf_sysctl_unregister(idev);
3455                                 return notifier_from_errno(err);
3456                         }
3457                 }
3458                 break;
3459
3460         case NETDEV_PRE_TYPE_CHANGE:
3461         case NETDEV_POST_TYPE_CHANGE:
3462                 if (idev)
3463                         addrconf_type_change(dev, event);
3464                 break;
3465
3466         case NETDEV_CHANGEUPPER:
3467                 info = ptr;
3468
3469                 /* flush all routes if dev is linked to or unlinked from
3470                  * an L3 master device (e.g., VRF)
3471                  */
3472                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3473                         addrconf_ifdown(dev, 0);
3474         }
3475
3476         return NOTIFY_OK;
3477 }
3478
3479 /*
3480  *      addrconf module should be notified of a device going up
3481  */
3482 static struct notifier_block ipv6_dev_notf = {
3483         .notifier_call = addrconf_notify,
3484 };
3485
3486 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3487 {
3488         struct inet6_dev *idev;
3489         ASSERT_RTNL();
3490
3491         idev = __in6_dev_get(dev);
3492
3493         if (event == NETDEV_POST_TYPE_CHANGE)
3494                 ipv6_mc_remap(idev);
3495         else if (event == NETDEV_PRE_TYPE_CHANGE)
3496                 ipv6_mc_unmap(idev);
3497 }
3498
3499 static bool addr_is_local(const struct in6_addr *addr)
3500 {
3501         return ipv6_addr_type(addr) &
3502                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3503 }
3504
3505 static int addrconf_ifdown(struct net_device *dev, int how)
3506 {
3507         struct net *net = dev_net(dev);
3508         struct inet6_dev *idev;
3509         struct inet6_ifaddr *ifa, *tmp;
3510         struct list_head del_list;
3511         int _keep_addr;
3512         bool keep_addr;
3513         int state, i;
3514
3515         ASSERT_RTNL();
3516
3517         rt6_ifdown(net, dev);
3518         neigh_ifdown(&nd_tbl, dev);
3519
3520         idev = __in6_dev_get(dev);
3521         if (!idev)
3522                 return -ENODEV;
3523
3524         /*
3525          * Step 1: remove reference to ipv6 device from parent device.
3526          *         Do not dev_put!
3527          */
3528         if (how) {
3529                 idev->dead = 1;
3530
3531                 /* protected by rtnl_lock */
3532                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3533
3534                 /* Step 1.5: remove snmp6 entry */
3535                 snmp6_unregister_dev(idev);
3536
3537         }
3538
3539         /* aggregate the system setting and interface setting */
3540         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3541         if (!_keep_addr)
3542                 _keep_addr = idev->cnf.keep_addr_on_down;
3543
3544         /* combine the user config with event to determine if permanent
3545          * addresses are to be removed from address hash table
3546          */
3547         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3548
3549         /* Step 2: clear hash table */
3550         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3551                 struct hlist_head *h = &inet6_addr_lst[i];
3552
3553                 spin_lock_bh(&addrconf_hash_lock);
3554 restart:
3555                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3556                         if (ifa->idev == idev) {
3557                                 addrconf_del_dad_work(ifa);
3558                                 /* combined flag + permanent flag decide if
3559                                  * address is retained on a down event
3560                                  */
3561                                 if (!keep_addr ||
3562                                     !(ifa->flags & IFA_F_PERMANENT) ||
3563                                     addr_is_local(&ifa->addr)) {
3564                                         hlist_del_init_rcu(&ifa->addr_lst);
3565                                         goto restart;
3566                                 }
3567                         }
3568                 }
3569                 spin_unlock_bh(&addrconf_hash_lock);
3570         }
3571
3572         write_lock_bh(&idev->lock);
3573
3574         addrconf_del_rs_timer(idev);
3575
3576         /* Step 2: clear flags for stateless addrconf */
3577         if (!how)
3578                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3579
3580         /* Step 3: clear tempaddr list */
3581         while (!list_empty(&idev->tempaddr_list)) {
3582                 ifa = list_first_entry(&idev->tempaddr_list,
3583                                        struct inet6_ifaddr, tmp_list);
3584                 list_del(&ifa->tmp_list);
3585                 write_unlock_bh(&idev->lock);
3586                 spin_lock_bh(&ifa->lock);
3587
3588                 if (ifa->ifpub) {
3589                         in6_ifa_put(ifa->ifpub);
3590                         ifa->ifpub = NULL;
3591                 }
3592                 spin_unlock_bh(&ifa->lock);
3593                 in6_ifa_put(ifa);
3594                 write_lock_bh(&idev->lock);
3595         }
3596
3597         /* re-combine the user config with event to determine if permanent
3598          * addresses are to be removed from the interface list
3599          */
3600         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3601
3602         INIT_LIST_HEAD(&del_list);
3603         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3604                 struct rt6_info *rt = NULL;
3605
3606                 addrconf_del_dad_work(ifa);
3607
3608                 write_unlock_bh(&idev->lock);
3609                 spin_lock_bh(&ifa->lock);
3610
3611                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3612                     !addr_is_local(&ifa->addr)) {
3613                         /* set state to skip the notifier below */
3614                         state = INET6_IFADDR_STATE_DEAD;
3615                         ifa->state = 0;
3616                         if (!(ifa->flags & IFA_F_NODAD))
3617                                 ifa->flags |= IFA_F_TENTATIVE;
3618
3619                         rt = ifa->rt;
3620                         ifa->rt = NULL;
3621                 } else {
3622                         state = ifa->state;
3623                         ifa->state = INET6_IFADDR_STATE_DEAD;
3624
3625                         list_move(&ifa->if_list, &del_list);
3626                 }
3627
3628                 spin_unlock_bh(&ifa->lock);
3629
3630                 if (rt)
3631                         ip6_del_rt(rt);
3632
3633                 if (state != INET6_IFADDR_STATE_DEAD) {
3634                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3635                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3636                 } else {
3637                         if (idev->cnf.forwarding)
3638                                 addrconf_leave_anycast(ifa);
3639                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3640                 }
3641
3642                 write_lock_bh(&idev->lock);
3643         }
3644
3645         write_unlock_bh(&idev->lock);
3646
3647         /* now clean up addresses to be removed */
3648         while (!list_empty(&del_list)) {
3649                 ifa = list_first_entry(&del_list,
3650                                        struct inet6_ifaddr, if_list);
3651                 list_del(&ifa->if_list);
3652
3653                 in6_ifa_put(ifa);
3654         }
3655
3656         /* Step 5: Discard anycast and multicast list */
3657         if (how) {
3658                 ipv6_ac_destroy_dev(idev);
3659                 ipv6_mc_destroy_dev(idev);
3660         } else {
3661                 ipv6_mc_down(idev);
3662         }
3663
3664         idev->tstamp = jiffies;
3665
3666         /* Last: Shot the device (if unregistered) */
3667         if (how) {
3668                 addrconf_sysctl_unregister(idev);
3669                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3670                 neigh_ifdown(&nd_tbl, dev);
3671                 in6_dev_put(idev);
3672         }
3673         return 0;
3674 }
3675
3676 static void addrconf_rs_timer(unsigned long data)
3677 {
3678         struct inet6_dev *idev = (struct inet6_dev *)data;
3679         struct net_device *dev = idev->dev;
3680         struct in6_addr lladdr;
3681
3682         write_lock(&idev->lock);
3683         if (idev->dead || !(idev->if_flags & IF_READY))
3684                 goto out;
3685
3686         if (!ipv6_accept_ra(idev))
3687                 goto out;
3688
3689         /* Announcement received after solicitation was sent */
3690         if (idev->if_flags & IF_RA_RCVD)
3691                 goto out;
3692
3693         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3694                 write_unlock(&idev->lock);
3695                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3696                         ndisc_send_rs(dev, &lladdr,
3697                                       &in6addr_linklocal_allrouters);
3698                 else
3699                         goto put;
3700
3701                 write_lock(&idev->lock);
3702                 idev->rs_interval = rfc3315_s14_backoff_update(
3703                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3704                 /* The wait after the last probe can be shorter */
3705                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3706                                              idev->cnf.rtr_solicits) ?
3707                                       idev->cnf.rtr_solicit_delay :
3708                                       idev->rs_interval);
3709         } else {
3710                 /*
3711                  * Note: we do not support deprecated "all on-link"
3712                  * assumption any longer.
3713                  */
3714                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3715         }
3716
3717 out:
3718         write_unlock(&idev->lock);
3719 put:
3720         in6_dev_put(idev);
3721 }
3722
3723 /*
3724  *      Duplicate Address Detection
3725  */
3726 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3727 {
3728         unsigned long rand_num;
3729         struct inet6_dev *idev = ifp->idev;
3730
3731         if (ifp->flags & IFA_F_OPTIMISTIC)
3732                 rand_num = 0;
3733         else
3734                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3735
3736         ifp->dad_probes = idev->cnf.dad_transmits;
3737         addrconf_mod_dad_work(ifp, rand_num);
3738 }
3739
3740 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3741 {
3742         struct inet6_dev *idev = ifp->idev;
3743         struct net_device *dev = idev->dev;
3744         bool notify = false;
3745
3746         addrconf_join_solict(dev, &ifp->addr);
3747
3748         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3749
3750         read_lock_bh(&idev->lock);
3751         spin_lock(&ifp->lock);
3752         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3753                 goto out;
3754
3755         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3756             idev->cnf.accept_dad < 1 ||
3757             !(ifp->flags&IFA_F_TENTATIVE) ||
3758             ifp->flags & IFA_F_NODAD) {
3759                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3760                 spin_unlock(&ifp->lock);
3761                 read_unlock_bh(&idev->lock);
3762
3763                 addrconf_dad_completed(ifp);
3764                 return;
3765         }
3766
3767         if (!(idev->if_flags & IF_READY)) {
3768                 spin_unlock(&ifp->lock);
3769                 read_unlock_bh(&idev->lock);
3770                 /*
3771                  * If the device is not ready:
3772                  * - keep it tentative if it is a permanent address.
3773                  * - otherwise, kill it.
3774                  */
3775                 in6_ifa_hold(ifp);
3776                 addrconf_dad_stop(ifp, 0);
3777                 return;
3778         }
3779
3780         /*
3781          * Optimistic nodes can start receiving
3782          * Frames right away
3783          */
3784         if (ifp->flags & IFA_F_OPTIMISTIC) {
3785                 ip6_ins_rt(ifp->rt);
3786                 if (ipv6_use_optimistic_addr(idev)) {
3787                         /* Because optimistic nodes can use this address,
3788                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3789                          */
3790                         notify = true;
3791                 }
3792         }
3793
3794         addrconf_dad_kick(ifp);
3795 out:
3796         spin_unlock(&ifp->lock);
3797         read_unlock_bh(&idev->lock);
3798         if (notify)
3799                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3800 }
3801
3802 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3803 {
3804         bool begin_dad = false;
3805
3806         spin_lock_bh(&ifp->lock);
3807         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3808                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3809                 begin_dad = true;
3810         }
3811         spin_unlock_bh(&ifp->lock);
3812
3813         if (begin_dad)
3814                 addrconf_mod_dad_work(ifp, 0);
3815 }
3816
3817 static void addrconf_dad_work(struct work_struct *w)
3818 {
3819         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3820                                                 struct inet6_ifaddr,
3821                                                 dad_work);
3822         struct inet6_dev *idev = ifp->idev;
3823         struct in6_addr mcaddr;
3824         bool disable_ipv6 = false;
3825
3826         enum {
3827                 DAD_PROCESS,
3828                 DAD_BEGIN,
3829                 DAD_ABORT,
3830         } action = DAD_PROCESS;
3831
3832         rtnl_lock();
3833
3834         spin_lock_bh(&ifp->lock);
3835         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3836                 action = DAD_BEGIN;
3837                 ifp->state = INET6_IFADDR_STATE_DAD;
3838         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3839                 action = DAD_ABORT;
3840                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3841
3842                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3843                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3844                         struct in6_addr addr;
3845
3846                         addr.s6_addr32[0] = htonl(0xfe800000);
3847                         addr.s6_addr32[1] = 0;
3848
3849                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3850                             ipv6_addr_equal(&ifp->addr, &addr)) {
3851                                 /* DAD failed for link-local based on MAC */
3852                                 idev->cnf.disable_ipv6 = 1;
3853
3854                                 pr_info("%s: IPv6 being disabled!\n",
3855                                         ifp->idev->dev->name);
3856                                 disable_ipv6 = true;
3857                         }
3858                 }
3859         }
3860         spin_unlock_bh(&ifp->lock);
3861
3862         if (action == DAD_BEGIN) {
3863                 addrconf_dad_begin(ifp);
3864                 goto out;
3865         } else if (action == DAD_ABORT) {
3866                 in6_ifa_hold(ifp);
3867                 addrconf_dad_stop(ifp, 1);
3868                 if (disable_ipv6)
3869                         addrconf_ifdown(idev->dev, 0);
3870                 goto out;
3871         }
3872
3873         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3874                 goto out;
3875
3876         write_lock_bh(&idev->lock);
3877         if (idev->dead || !(idev->if_flags & IF_READY)) {
3878                 write_unlock_bh(&idev->lock);
3879                 goto out;
3880         }
3881
3882         spin_lock(&ifp->lock);
3883         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3884                 spin_unlock(&ifp->lock);
3885                 write_unlock_bh(&idev->lock);
3886                 goto out;
3887         }
3888
3889         if (ifp->dad_probes == 0) {
3890                 /*
3891                  * DAD was successful
3892                  */
3893
3894                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3895                 spin_unlock(&ifp->lock);
3896                 write_unlock_bh(&idev->lock);
3897
3898                 addrconf_dad_completed(ifp);
3899
3900                 goto out;
3901         }
3902
3903         ifp->dad_probes--;
3904         addrconf_mod_dad_work(ifp,
3905                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3906         spin_unlock(&ifp->lock);
3907         write_unlock_bh(&idev->lock);
3908
3909         /* send a neighbour solicitation for our addr */
3910         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3911         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3912 out:
3913         in6_ifa_put(ifp);
3914         rtnl_unlock();
3915 }
3916
3917 /* ifp->idev must be at least read locked */
3918 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3919 {
3920         struct inet6_ifaddr *ifpiter;
3921         struct inet6_dev *idev = ifp->idev;
3922
3923         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3924                 if (ifpiter->scope > IFA_LINK)
3925                         break;
3926                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3927                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3928                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3929                     IFA_F_PERMANENT)
3930                         return false;
3931         }
3932         return true;
3933 }
3934
3935 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3936 {
3937         struct net_device *dev = ifp->idev->dev;
3938         struct in6_addr lladdr;
3939         bool send_rs, send_mld;
3940
3941         addrconf_del_dad_work(ifp);
3942
3943         /*
3944          *      Configure the address for reception. Now it is valid.
3945          */
3946
3947         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3948
3949         /* If added prefix is link local and we are prepared to process
3950            router advertisements, start sending router solicitations.
3951          */
3952
3953         read_lock_bh(&ifp->idev->lock);
3954         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3955         send_rs = send_mld &&
3956                   ipv6_accept_ra(ifp->idev) &&
3957                   ifp->idev->cnf.rtr_solicits != 0 &&
3958                   (dev->flags&IFF_LOOPBACK) == 0;
3959         read_unlock_bh(&ifp->idev->lock);
3960
3961         /* While dad is in progress mld report's source address is in6_addrany.
3962          * Resend with proper ll now.
3963          */
3964         if (send_mld)
3965                 ipv6_mc_dad_complete(ifp->idev);
3966
3967         if (send_rs) {
3968                 /*
3969                  *      If a host as already performed a random delay
3970                  *      [...] as part of DAD [...] there is no need
3971                  *      to delay again before sending the first RS
3972                  */
3973                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3974                         return;
3975                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3976
3977                 write_lock_bh(&ifp->idev->lock);
3978                 spin_lock(&ifp->lock);
3979                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
3980                         ifp->idev->cnf.rtr_solicit_interval);
3981                 ifp->idev->rs_probes = 1;
3982                 ifp->idev->if_flags |= IF_RS_SENT;
3983                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
3984                 spin_unlock(&ifp->lock);
3985                 write_unlock_bh(&ifp->idev->lock);
3986         }
3987 }
3988
3989 static void addrconf_dad_run(struct inet6_dev *idev)
3990 {
3991         struct inet6_ifaddr *ifp;
3992
3993         read_lock_bh(&idev->lock);
3994         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3995                 spin_lock(&ifp->lock);
3996                 if (ifp->flags & IFA_F_TENTATIVE &&
3997                     ifp->state == INET6_IFADDR_STATE_DAD)
3998                         addrconf_dad_kick(ifp);
3999                 spin_unlock(&ifp->lock);
4000         }
4001         read_unlock_bh(&idev->lock);
4002 }
4003
4004 #ifdef CONFIG_PROC_FS
4005 struct if6_iter_state {
4006         struct seq_net_private p;
4007         int bucket;
4008         int offset;
4009 };
4010
4011 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4012 {
4013         struct inet6_ifaddr *ifa = NULL;
4014         struct if6_iter_state *state = seq->private;
4015         struct net *net = seq_file_net(seq);
4016         int p = 0;
4017
4018         /* initial bucket if pos is 0 */
4019         if (pos == 0) {
4020                 state->bucket = 0;
4021                 state->offset = 0;
4022         }
4023
4024         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4025                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4026                                          addr_lst) {
4027                         if (!net_eq(dev_net(ifa->idev->dev), net))
4028                                 continue;
4029                         /* sync with offset */
4030                         if (p < state->offset) {
4031                                 p++;
4032                                 continue;
4033                         }
4034                         state->offset++;
4035                         return ifa;
4036                 }
4037
4038                 /* prepare for next bucket */
4039                 state->offset = 0;
4040                 p = 0;
4041         }
4042         return NULL;
4043 }
4044
4045 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4046                                          struct inet6_ifaddr *ifa)
4047 {
4048         struct if6_iter_state *state = seq->private;
4049         struct net *net = seq_file_net(seq);
4050
4051         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4052                 if (!net_eq(dev_net(ifa->idev->dev), net))
4053                         continue;
4054                 state->offset++;
4055                 return ifa;
4056         }
4057
4058         while (++state->bucket < IN6_ADDR_HSIZE) {
4059                 state->offset = 0;
4060                 hlist_for_each_entry_rcu_bh(ifa,
4061                                      &inet6_addr_lst[state->bucket], addr_lst) {
4062                         if (!net_eq(dev_net(ifa->idev->dev), net))
4063                                 continue;
4064                         state->offset++;
4065                         return ifa;
4066                 }
4067         }
4068
4069         return NULL;
4070 }
4071
4072 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4073         __acquires(rcu_bh)
4074 {
4075         rcu_read_lock_bh();
4076         return if6_get_first(seq, *pos);
4077 }
4078
4079 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4080 {
4081         struct inet6_ifaddr *ifa;
4082
4083         ifa = if6_get_next(seq, v);
4084         ++*pos;
4085         return ifa;
4086 }
4087
4088 static void if6_seq_stop(struct seq_file *seq, void *v)
4089         __releases(rcu_bh)
4090 {
4091         rcu_read_unlock_bh();
4092 }
4093
4094 static int if6_seq_show(struct seq_file *seq, void *v)
4095 {
4096         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4097         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4098                    &ifp->addr,
4099                    ifp->idev->dev->ifindex,
4100                    ifp->prefix_len,
4101                    ifp->scope,
4102                    (u8) ifp->flags,
4103                    ifp->idev->dev->name);
4104         return 0;
4105 }
4106
4107 static const struct seq_operations if6_seq_ops = {
4108         .start  = if6_seq_start,
4109         .next   = if6_seq_next,
4110         .show   = if6_seq_show,
4111         .stop   = if6_seq_stop,
4112 };
4113
4114 static int if6_seq_open(struct inode *inode, struct file *file)
4115 {
4116         return seq_open_net(inode, file, &if6_seq_ops,
4117                             sizeof(struct if6_iter_state));
4118 }
4119
4120 static const struct file_operations if6_fops = {
4121         .owner          = THIS_MODULE,
4122         .open           = if6_seq_open,
4123         .read           = seq_read,
4124         .llseek         = seq_lseek,
4125         .release        = seq_release_net,
4126 };
4127
4128 static int __net_init if6_proc_net_init(struct net *net)
4129 {
4130         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4131                 return -ENOMEM;
4132         return 0;
4133 }
4134
4135 static void __net_exit if6_proc_net_exit(struct net *net)
4136 {
4137         remove_proc_entry("if_inet6", net->proc_net);
4138 }
4139
4140 static struct pernet_operations if6_proc_net_ops = {
4141         .init = if6_proc_net_init,
4142         .exit = if6_proc_net_exit,
4143 };
4144
4145 int __init if6_proc_init(void)
4146 {
4147         return register_pernet_subsys(&if6_proc_net_ops);
4148 }
4149
4150 void if6_proc_exit(void)
4151 {
4152         unregister_pernet_subsys(&if6_proc_net_ops);
4153 }
4154 #endif  /* CONFIG_PROC_FS */
4155
4156 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4157 /* Check if address is a home address configured on any interface. */
4158 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4159 {
4160         int ret = 0;
4161         struct inet6_ifaddr *ifp = NULL;
4162         unsigned int hash = inet6_addr_hash(addr);
4163
4164         rcu_read_lock_bh();
4165         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4166                 if (!net_eq(dev_net(ifp->idev->dev), net))
4167                         continue;
4168                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4169                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4170                         ret = 1;
4171                         break;
4172                 }
4173         }
4174         rcu_read_unlock_bh();
4175         return ret;
4176 }
4177 #endif
4178
4179 /*
4180  *      Periodic address status verification
4181  */
4182
4183 static void addrconf_verify_rtnl(void)
4184 {
4185         unsigned long now, next, next_sec, next_sched;
4186         struct inet6_ifaddr *ifp;
4187         int i;
4188
4189         ASSERT_RTNL();
4190
4191         rcu_read_lock_bh();
4192         now = jiffies;
4193         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4194
4195         cancel_delayed_work(&addr_chk_work);
4196
4197         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4198 restart:
4199                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4200                         unsigned long age;
4201
4202                         /* When setting preferred_lft to a value not zero or
4203                          * infinity, while valid_lft is infinity
4204                          * IFA_F_PERMANENT has a non-infinity life time.
4205                          */
4206                         if ((ifp->flags & IFA_F_PERMANENT) &&
4207                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4208                                 continue;
4209
4210                         spin_lock(&ifp->lock);
4211                         /* We try to batch several events at once. */
4212                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4213
4214                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4215                             age >= ifp->valid_lft) {
4216                                 spin_unlock(&ifp->lock);
4217                                 in6_ifa_hold(ifp);
4218                                 ipv6_del_addr(ifp);
4219                                 goto restart;
4220                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4221                                 spin_unlock(&ifp->lock);
4222                                 continue;
4223                         } else if (age >= ifp->prefered_lft) {
4224                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4225                                 int deprecate = 0;
4226
4227                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4228                                         deprecate = 1;
4229                                         ifp->flags |= IFA_F_DEPRECATED;
4230                                 }
4231
4232                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4233                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4234                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4235
4236                                 spin_unlock(&ifp->lock);
4237
4238                                 if (deprecate) {
4239                                         in6_ifa_hold(ifp);
4240
4241                                         ipv6_ifa_notify(0, ifp);
4242                                         in6_ifa_put(ifp);
4243                                         goto restart;
4244                                 }
4245                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4246                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4247                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4248                                         ifp->idev->cnf.dad_transmits *
4249                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4250
4251                                 if (age >= ifp->prefered_lft - regen_advance) {
4252                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4253                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4254                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4255                                         if (!ifp->regen_count && ifpub) {
4256                                                 ifp->regen_count++;
4257                                                 in6_ifa_hold(ifp);
4258                                                 in6_ifa_hold(ifpub);
4259                                                 spin_unlock(&ifp->lock);
4260
4261                                                 spin_lock(&ifpub->lock);
4262                                                 ifpub->regen_count = 0;
4263                                                 spin_unlock(&ifpub->lock);
4264                                                 ipv6_create_tempaddr(ifpub, ifp);
4265                                                 in6_ifa_put(ifpub);
4266                                                 in6_ifa_put(ifp);
4267                                                 goto restart;
4268                                         }
4269                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4270                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4271                                 spin_unlock(&ifp->lock);
4272                         } else {
4273                                 /* ifp->prefered_lft <= ifp->valid_lft */
4274                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4275                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4276                                 spin_unlock(&ifp->lock);
4277                         }
4278                 }
4279         }
4280
4281         next_sec = round_jiffies_up(next);
4282         next_sched = next;
4283
4284         /* If rounded timeout is accurate enough, accept it. */
4285         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4286                 next_sched = next_sec;
4287
4288         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4289         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4290                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4291
4292         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4293               now, next, next_sec, next_sched);
4294         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4295         rcu_read_unlock_bh();
4296 }
4297
4298 static void addrconf_verify_work(struct work_struct *w)
4299 {
4300         rtnl_lock();
4301         addrconf_verify_rtnl();
4302         rtnl_unlock();
4303 }
4304
4305 static void addrconf_verify(void)
4306 {
4307         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4308 }
4309
4310 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4311                                      struct in6_addr **peer_pfx)
4312 {
4313         struct in6_addr *pfx = NULL;
4314
4315         *peer_pfx = NULL;
4316
4317         if (addr)
4318                 pfx = nla_data(addr);
4319
4320         if (local) {
4321                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4322                         *peer_pfx = pfx;
4323                 pfx = nla_data(local);
4324         }
4325
4326         return pfx;
4327 }
4328
4329 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4330         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4331         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4332         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4333         [IFA_FLAGS]             = { .len = sizeof(u32) },
4334 };
4335
4336 static int
4337 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4338 {
4339         struct net *net = sock_net(skb->sk);
4340         struct ifaddrmsg *ifm;
4341         struct nlattr *tb[IFA_MAX+1];
4342         struct in6_addr *pfx, *peer_pfx;
4343         u32 ifa_flags;
4344         int err;
4345
4346         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4347         if (err < 0)
4348                 return err;
4349
4350         ifm = nlmsg_data(nlh);
4351         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4352         if (!pfx)
4353                 return -EINVAL;
4354
4355         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4356
4357         /* We ignore other flags so far. */
4358         ifa_flags &= IFA_F_MANAGETEMPADDR;
4359
4360         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4361                               ifm->ifa_prefixlen);
4362 }
4363
4364 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4365                              u32 prefered_lft, u32 valid_lft)
4366 {
4367         u32 flags;
4368         clock_t expires;
4369         unsigned long timeout;
4370         bool was_managetempaddr;
4371         bool had_prefixroute;
4372
4373         ASSERT_RTNL();
4374
4375         if (!valid_lft || (prefered_lft > valid_lft))
4376                 return -EINVAL;
4377
4378         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4379             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4380                 return -EINVAL;
4381
4382         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4383         if (addrconf_finite_timeout(timeout)) {
4384                 expires = jiffies_to_clock_t(timeout * HZ);
4385                 valid_lft = timeout;
4386                 flags = RTF_EXPIRES;
4387         } else {
4388                 expires = 0;
4389                 flags = 0;
4390                 ifa_flags |= IFA_F_PERMANENT;
4391         }
4392
4393         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4394         if (addrconf_finite_timeout(timeout)) {
4395                 if (timeout == 0)
4396                         ifa_flags |= IFA_F_DEPRECATED;
4397                 prefered_lft = timeout;
4398         }
4399
4400         spin_lock_bh(&ifp->lock);
4401         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4402         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4403                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4404         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4405                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4406                         IFA_F_NOPREFIXROUTE);
4407         ifp->flags |= ifa_flags;
4408         ifp->tstamp = jiffies;
4409         ifp->valid_lft = valid_lft;
4410         ifp->prefered_lft = prefered_lft;
4411
4412         spin_unlock_bh(&ifp->lock);
4413         if (!(ifp->flags&IFA_F_TENTATIVE))
4414                 ipv6_ifa_notify(0, ifp);
4415
4416         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4417                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4418                                       expires, flags);
4419         } else if (had_prefixroute) {
4420                 enum cleanup_prefix_rt_t action;
4421                 unsigned long rt_expires;
4422
4423                 write_lock_bh(&ifp->idev->lock);
4424                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4425                 write_unlock_bh(&ifp->idev->lock);
4426
4427                 if (action != CLEANUP_PREFIX_RT_NOP) {
4428                         cleanup_prefix_route(ifp, rt_expires,
4429                                 action == CLEANUP_PREFIX_RT_DEL);
4430                 }
4431         }
4432
4433         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4434                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4435                         valid_lft = prefered_lft = 0;
4436                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4437                                  !was_managetempaddr, jiffies);
4438         }
4439
4440         addrconf_verify_rtnl();
4441
4442         return 0;
4443 }
4444
4445 static int
4446 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4447 {
4448         struct net *net = sock_net(skb->sk);
4449         struct ifaddrmsg *ifm;
4450         struct nlattr *tb[IFA_MAX+1];
4451         struct in6_addr *pfx, *peer_pfx;
4452         struct inet6_ifaddr *ifa;
4453         struct net_device *dev;
4454         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4455         u32 ifa_flags;
4456         int err;
4457
4458         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4459         if (err < 0)
4460                 return err;
4461
4462         ifm = nlmsg_data(nlh);
4463         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4464         if (!pfx)
4465                 return -EINVAL;
4466
4467         if (tb[IFA_CACHEINFO]) {
4468                 struct ifa_cacheinfo *ci;
4469
4470                 ci = nla_data(tb[IFA_CACHEINFO]);
4471                 valid_lft = ci->ifa_valid;
4472                 preferred_lft = ci->ifa_prefered;
4473         } else {
4474                 preferred_lft = INFINITY_LIFE_TIME;
4475                 valid_lft = INFINITY_LIFE_TIME;
4476         }
4477
4478         dev =  __dev_get_by_index(net, ifm->ifa_index);
4479         if (!dev)
4480                 return -ENODEV;
4481
4482         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4483
4484         /* We ignore other flags so far. */
4485         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4486                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4487
4488         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4489         if (!ifa) {
4490                 /*
4491                  * It would be best to check for !NLM_F_CREATE here but
4492                  * userspace already relies on not having to provide this.
4493                  */
4494                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4495                                       ifm->ifa_prefixlen, ifa_flags,
4496                                       preferred_lft, valid_lft);
4497         }
4498
4499         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4500             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4501                 err = -EEXIST;
4502         else
4503                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4504
4505         in6_ifa_put(ifa);
4506
4507         return err;
4508 }
4509
4510 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4511                           u8 scope, int ifindex)
4512 {
4513         struct ifaddrmsg *ifm;
4514
4515         ifm = nlmsg_data(nlh);
4516         ifm->ifa_family = AF_INET6;
4517         ifm->ifa_prefixlen = prefixlen;
4518         ifm->ifa_flags = flags;
4519         ifm->ifa_scope = scope;
4520         ifm->ifa_index = ifindex;
4521 }
4522
4523 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4524                          unsigned long tstamp, u32 preferred, u32 valid)
4525 {
4526         struct ifa_cacheinfo ci;
4527
4528         ci.cstamp = cstamp_delta(cstamp);
4529         ci.tstamp = cstamp_delta(tstamp);
4530         ci.ifa_prefered = preferred;
4531         ci.ifa_valid = valid;
4532
4533         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4534 }
4535
4536 static inline int rt_scope(int ifa_scope)
4537 {
4538         if (ifa_scope & IFA_HOST)
4539                 return RT_SCOPE_HOST;
4540         else if (ifa_scope & IFA_LINK)
4541                 return RT_SCOPE_LINK;
4542         else if (ifa_scope & IFA_SITE)
4543                 return RT_SCOPE_SITE;
4544         else
4545                 return RT_SCOPE_UNIVERSE;
4546 }
4547
4548 static inline int inet6_ifaddr_msgsize(void)
4549 {
4550         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4551                + nla_total_size(16) /* IFA_LOCAL */
4552                + nla_total_size(16) /* IFA_ADDRESS */
4553                + nla_total_size(sizeof(struct ifa_cacheinfo))
4554                + nla_total_size(4)  /* IFA_FLAGS */;
4555 }
4556
4557 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4558                              u32 portid, u32 seq, int event, unsigned int flags)
4559 {
4560         struct nlmsghdr  *nlh;
4561         u32 preferred, valid;
4562
4563         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4564         if (!nlh)
4565                 return -EMSGSIZE;
4566
4567         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4568                       ifa->idev->dev->ifindex);
4569
4570         if (!((ifa->flags&IFA_F_PERMANENT) &&
4571               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4572                 preferred = ifa->prefered_lft;
4573                 valid = ifa->valid_lft;
4574                 if (preferred != INFINITY_LIFE_TIME) {
4575                         long tval = (jiffies - ifa->tstamp)/HZ;
4576                         if (preferred > tval)
4577                                 preferred -= tval;
4578                         else
4579                                 preferred = 0;
4580                         if (valid != INFINITY_LIFE_TIME) {
4581                                 if (valid > tval)
4582                                         valid -= tval;
4583                                 else
4584                                         valid = 0;
4585                         }
4586                 }
4587         } else {
4588                 preferred = INFINITY_LIFE_TIME;
4589                 valid = INFINITY_LIFE_TIME;
4590         }
4591
4592         if (!ipv6_addr_any(&ifa->peer_addr)) {
4593                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4594                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4595                         goto error;
4596         } else
4597                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4598                         goto error;
4599
4600         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4601                 goto error;
4602
4603         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4604                 goto error;
4605
4606         nlmsg_end(skb, nlh);
4607         return 0;
4608
4609 error:
4610         nlmsg_cancel(skb, nlh);
4611         return -EMSGSIZE;
4612 }
4613
4614 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4615                                 u32 portid, u32 seq, int event, u16 flags)
4616 {
4617         struct nlmsghdr  *nlh;
4618         u8 scope = RT_SCOPE_UNIVERSE;
4619         int ifindex = ifmca->idev->dev->ifindex;
4620
4621         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4622                 scope = RT_SCOPE_SITE;
4623
4624         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4625         if (!nlh)
4626                 return -EMSGSIZE;
4627
4628         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4629         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4630             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4631                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4632                 nlmsg_cancel(skb, nlh);
4633                 return -EMSGSIZE;
4634         }
4635
4636         nlmsg_end(skb, nlh);
4637         return 0;
4638 }
4639
4640 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4641                                 u32 portid, u32 seq, int event, unsigned int flags)
4642 {
4643         struct nlmsghdr  *nlh;
4644         u8 scope = RT_SCOPE_UNIVERSE;
4645         int ifindex = ifaca->aca_idev->dev->ifindex;
4646
4647         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4648                 scope = RT_SCOPE_SITE;
4649
4650         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4651         if (!nlh)
4652                 return -EMSGSIZE;
4653
4654         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4655         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4656             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4657                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4658                 nlmsg_cancel(skb, nlh);
4659                 return -EMSGSIZE;
4660         }
4661
4662         nlmsg_end(skb, nlh);
4663         return 0;
4664 }
4665
4666 enum addr_type_t {
4667         UNICAST_ADDR,
4668         MULTICAST_ADDR,
4669         ANYCAST_ADDR,
4670 };
4671
4672 /* called with rcu_read_lock() */
4673 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4674                           struct netlink_callback *cb, enum addr_type_t type,
4675                           int s_ip_idx, int *p_ip_idx)
4676 {
4677         struct ifmcaddr6 *ifmca;
4678         struct ifacaddr6 *ifaca;
4679         int err = 1;
4680         int ip_idx = *p_ip_idx;
4681
4682         read_lock_bh(&idev->lock);
4683         switch (type) {
4684         case UNICAST_ADDR: {
4685                 struct inet6_ifaddr *ifa;
4686
4687                 /* unicast address incl. temp addr */
4688                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4689                         if (++ip_idx < s_ip_idx)
4690                                 continue;
4691                         err = inet6_fill_ifaddr(skb, ifa,
4692                                                 NETLINK_CB(cb->skb).portid,
4693                                                 cb->nlh->nlmsg_seq,
4694                                                 RTM_NEWADDR,
4695                                                 NLM_F_MULTI);
4696                         if (err < 0)
4697                                 break;
4698                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4699                 }
4700                 break;
4701         }
4702         case MULTICAST_ADDR:
4703                 /* multicast address */
4704                 for (ifmca = idev->mc_list; ifmca;
4705                      ifmca = ifmca->next, ip_idx++) {
4706                         if (ip_idx < s_ip_idx)
4707                                 continue;
4708                         err = inet6_fill_ifmcaddr(skb, ifmca,
4709                                                   NETLINK_CB(cb->skb).portid,
4710                                                   cb->nlh->nlmsg_seq,
4711                                                   RTM_GETMULTICAST,
4712                                                   NLM_F_MULTI);
4713                         if (err < 0)
4714                                 break;
4715                 }
4716                 break;
4717         case ANYCAST_ADDR:
4718                 /* anycast address */
4719                 for (ifaca = idev->ac_list; ifaca;
4720                      ifaca = ifaca->aca_next, ip_idx++) {
4721                         if (ip_idx < s_ip_idx)
4722                                 continue;
4723                         err = inet6_fill_ifacaddr(skb, ifaca,
4724                                                   NETLINK_CB(cb->skb).portid,
4725                                                   cb->nlh->nlmsg_seq,
4726                                                   RTM_GETANYCAST,
4727                                                   NLM_F_MULTI);
4728                         if (err < 0)
4729                                 break;
4730                 }
4731                 break;
4732         default:
4733                 break;
4734         }
4735         read_unlock_bh(&idev->lock);
4736         *p_ip_idx = ip_idx;
4737         return err;
4738 }
4739
4740 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4741                            enum addr_type_t type)
4742 {
4743         struct net *net = sock_net(skb->sk);
4744         int h, s_h;
4745         int idx, ip_idx;
4746         int s_idx, s_ip_idx;
4747         struct net_device *dev;
4748         struct inet6_dev *idev;
4749         struct hlist_head *head;
4750
4751         s_h = cb->args[0];
4752         s_idx = idx = cb->args[1];
4753         s_ip_idx = ip_idx = cb->args[2];
4754
4755         rcu_read_lock();
4756         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4757         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4758                 idx = 0;
4759                 head = &net->dev_index_head[h];
4760                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4761                         if (idx < s_idx)
4762                                 goto cont;
4763                         if (h > s_h || idx > s_idx)
4764                                 s_ip_idx = 0;
4765                         ip_idx = 0;
4766                         idev = __in6_dev_get(dev);
4767                         if (!idev)
4768                                 goto cont;
4769
4770                         if (in6_dump_addrs(idev, skb, cb, type,
4771                                            s_ip_idx, &ip_idx) < 0)
4772                                 goto done;
4773 cont:
4774                         idx++;
4775                 }
4776         }
4777 done:
4778         rcu_read_unlock();
4779         cb->args[0] = h;
4780         cb->args[1] = idx;
4781         cb->args[2] = ip_idx;
4782
4783         return skb->len;
4784 }
4785
4786 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4787 {
4788         enum addr_type_t type = UNICAST_ADDR;
4789
4790         return inet6_dump_addr(skb, cb, type);
4791 }
4792
4793 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4794 {
4795         enum addr_type_t type = MULTICAST_ADDR;
4796
4797         return inet6_dump_addr(skb, cb, type);
4798 }
4799
4800
4801 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4802 {
4803         enum addr_type_t type = ANYCAST_ADDR;
4804
4805         return inet6_dump_addr(skb, cb, type);
4806 }
4807
4808 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4809 {
4810         struct net *net = sock_net(in_skb->sk);
4811         struct ifaddrmsg *ifm;
4812         struct nlattr *tb[IFA_MAX+1];
4813         struct in6_addr *addr = NULL, *peer;
4814         struct net_device *dev = NULL;
4815         struct inet6_ifaddr *ifa;
4816         struct sk_buff *skb;
4817         int err;
4818
4819         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4820         if (err < 0)
4821                 goto errout;
4822
4823         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4824         if (!addr) {
4825                 err = -EINVAL;
4826                 goto errout;
4827         }
4828
4829         ifm = nlmsg_data(nlh);
4830         if (ifm->ifa_index)
4831                 dev = __dev_get_by_index(net, ifm->ifa_index);
4832
4833         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4834         if (!ifa) {
4835                 err = -EADDRNOTAVAIL;
4836                 goto errout;
4837         }
4838
4839         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4840         if (!skb) {
4841                 err = -ENOBUFS;
4842                 goto errout_ifa;
4843         }
4844
4845         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4846                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4847         if (err < 0) {
4848                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4849                 WARN_ON(err == -EMSGSIZE);
4850                 kfree_skb(skb);
4851                 goto errout_ifa;
4852         }
4853         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4854 errout_ifa:
4855         in6_ifa_put(ifa);
4856 errout:
4857         return err;
4858 }
4859
4860 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4861 {
4862         struct sk_buff *skb;
4863         struct net *net = dev_net(ifa->idev->dev);
4864         int err = -ENOBUFS;
4865
4866         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4867         if (!skb)
4868                 goto errout;
4869
4870         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4871         if (err < 0) {
4872                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4873                 WARN_ON(err == -EMSGSIZE);
4874                 kfree_skb(skb);
4875                 goto errout;
4876         }
4877         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4878         return;
4879 errout:
4880         if (err < 0)
4881                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4882 }
4883
4884 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4885                                 __s32 *array, int bytes)
4886 {
4887         BUG_ON(bytes < (DEVCONF_MAX * 4));
4888
4889         memset(array, 0, bytes);
4890         array[DEVCONF_FORWARDING] = cnf->forwarding;
4891         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4892         array[DEVCONF_MTU6] = cnf->mtu6;
4893         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4894         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4895         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4896         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4897         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4898         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4899                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4900         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4901                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4902         array[DEVCONF_RTR_SOLICIT_DELAY] =
4903                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4904         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4905         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4906                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4907         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4908                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4909         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4910         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4911         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4912         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4913         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4914         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4915         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4916         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4917         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4918 #ifdef CONFIG_IPV6_ROUTER_PREF
4919         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4920         array[DEVCONF_RTR_PROBE_INTERVAL] =
4921                 jiffies_to_msecs(cnf->rtr_probe_interval);
4922 #ifdef CONFIG_IPV6_ROUTE_INFO
4923         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4924 #endif
4925 #endif
4926         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4927         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4928 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4929         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4930         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4931 #endif
4932 #ifdef CONFIG_IPV6_MROUTE
4933         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4934 #endif
4935         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4936         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4937         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4938         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4939         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4940         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4941         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4942         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4943         /* we omit DEVCONF_STABLE_SECRET for now */
4944         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4945         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4946         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4947         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4948 }
4949
4950 static inline size_t inet6_ifla6_size(void)
4951 {
4952         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4953              + nla_total_size(sizeof(struct ifla_cacheinfo))
4954              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4955              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4956              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4957              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4958 }
4959
4960 static inline size_t inet6_if_nlmsg_size(void)
4961 {
4962         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4963                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4964                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4965                + nla_total_size(4) /* IFLA_MTU */
4966                + nla_total_size(4) /* IFLA_LINK */
4967                + nla_total_size(1) /* IFLA_OPERSTATE */
4968                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4969 }
4970
4971 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4972                                         int bytes)
4973 {
4974         int i;
4975         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
4976         BUG_ON(pad < 0);
4977
4978         /* Use put_unaligned() because stats may not be aligned for u64. */
4979         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
4980         for (i = 1; i < ICMP6_MIB_MAX; i++)
4981                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4982
4983         memset(&stats[ICMP6_MIB_MAX], 0, pad);
4984 }
4985
4986 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4987                                         int bytes, size_t syncpoff)
4988 {
4989         int i, c;
4990         u64 buff[IPSTATS_MIB_MAX];
4991         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4992
4993         BUG_ON(pad < 0);
4994
4995         memset(buff, 0, sizeof(buff));
4996         buff[0] = IPSTATS_MIB_MAX;
4997
4998         for_each_possible_cpu(c) {
4999                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5000                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5001         }
5002
5003         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5004         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5005 }
5006
5007 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5008                              int bytes)
5009 {
5010         switch (attrtype) {
5011         case IFLA_INET6_STATS:
5012                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5013                                      offsetof(struct ipstats_mib, syncp));
5014                 break;
5015         case IFLA_INET6_ICMP6STATS:
5016                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5017                 break;
5018         }
5019 }
5020
5021 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5022                                   u32 ext_filter_mask)
5023 {
5024         struct nlattr *nla;
5025         struct ifla_cacheinfo ci;
5026
5027         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5028                 goto nla_put_failure;
5029         ci.max_reasm_len = IPV6_MAXPLEN;
5030         ci.tstamp = cstamp_delta(idev->tstamp);
5031         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5032         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5033         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5034                 goto nla_put_failure;
5035         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5036         if (!nla)
5037                 goto nla_put_failure;
5038         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5039
5040         /* XXX - MC not implemented */
5041
5042         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5043                 return 0;
5044
5045         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5046         if (!nla)
5047                 goto nla_put_failure;
5048         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5049
5050         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5051         if (!nla)
5052                 goto nla_put_failure;
5053         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5054
5055         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5056         if (!nla)
5057                 goto nla_put_failure;
5058
5059         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5060                 goto nla_put_failure;
5061
5062         read_lock_bh(&idev->lock);
5063         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5064         read_unlock_bh(&idev->lock);
5065
5066         return 0;
5067
5068 nla_put_failure:
5069         return -EMSGSIZE;
5070 }
5071
5072 static size_t inet6_get_link_af_size(const struct net_device *dev,
5073                                      u32 ext_filter_mask)
5074 {
5075         if (!__in6_dev_get(dev))
5076                 return 0;
5077
5078         return inet6_ifla6_size();
5079 }
5080
5081 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5082                               u32 ext_filter_mask)
5083 {
5084         struct inet6_dev *idev = __in6_dev_get(dev);
5085
5086         if (!idev)
5087                 return -ENODATA;
5088
5089         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5090                 return -EMSGSIZE;
5091
5092         return 0;
5093 }
5094
5095 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5096 {
5097         struct inet6_ifaddr *ifp;
5098         struct net_device *dev = idev->dev;
5099         bool clear_token, update_rs = false;
5100         struct in6_addr ll_addr;
5101
5102         ASSERT_RTNL();
5103
5104         if (!token)
5105                 return -EINVAL;
5106         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5107                 return -EINVAL;
5108         if (!ipv6_accept_ra(idev))
5109                 return -EINVAL;
5110         if (idev->cnf.rtr_solicits == 0)
5111                 return -EINVAL;
5112
5113         write_lock_bh(&idev->lock);
5114
5115         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5116         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5117
5118         write_unlock_bh(&idev->lock);
5119
5120         clear_token = ipv6_addr_any(token);
5121         if (clear_token)
5122                 goto update_lft;
5123
5124         if (!idev->dead && (idev->if_flags & IF_READY) &&
5125             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5126                              IFA_F_OPTIMISTIC)) {
5127                 /* If we're not ready, then normal ifup will take care
5128                  * of this. Otherwise, we need to request our rs here.
5129                  */
5130                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5131                 update_rs = true;
5132         }
5133
5134 update_lft:
5135         write_lock_bh(&idev->lock);
5136
5137         if (update_rs) {
5138                 idev->if_flags |= IF_RS_SENT;
5139                 idev->rs_interval = rfc3315_s14_backoff_init(
5140                         idev->cnf.rtr_solicit_interval);
5141                 idev->rs_probes = 1;
5142                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5143         }
5144
5145         /* Well, that's kinda nasty ... */
5146         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5147                 spin_lock(&ifp->lock);
5148                 if (ifp->tokenized) {
5149                         ifp->valid_lft = 0;
5150                         ifp->prefered_lft = 0;
5151                 }
5152                 spin_unlock(&ifp->lock);
5153         }
5154
5155         write_unlock_bh(&idev->lock);
5156         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5157         addrconf_verify_rtnl();
5158         return 0;
5159 }
5160
5161 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5162         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5163         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5164 };
5165
5166 static int inet6_validate_link_af(const struct net_device *dev,
5167                                   const struct nlattr *nla)
5168 {
5169         struct nlattr *tb[IFLA_INET6_MAX + 1];
5170
5171         if (dev && !__in6_dev_get(dev))
5172                 return -EAFNOSUPPORT;
5173
5174         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5175 }
5176
5177 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5178 {
5179         int err = -EINVAL;
5180         struct inet6_dev *idev = __in6_dev_get(dev);
5181         struct nlattr *tb[IFLA_INET6_MAX + 1];
5182
5183         if (!idev)
5184                 return -EAFNOSUPPORT;
5185
5186         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5187                 BUG();
5188
5189         if (tb[IFLA_INET6_TOKEN]) {
5190                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5191                 if (err)
5192                         return err;
5193         }
5194
5195         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5196                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5197
5198                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5199                     mode != IN6_ADDR_GEN_MODE_NONE &&
5200                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5201                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5202                         return -EINVAL;
5203
5204                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5205                     !idev->cnf.stable_secret.initialized &&
5206                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5207                         return -EINVAL;
5208
5209                 idev->addr_gen_mode = mode;
5210                 err = 0;
5211         }
5212
5213         return err;
5214 }
5215
5216 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5217                              u32 portid, u32 seq, int event, unsigned int flags)
5218 {
5219         struct net_device *dev = idev->dev;
5220         struct ifinfomsg *hdr;
5221         struct nlmsghdr *nlh;
5222         void *protoinfo;
5223
5224         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5225         if (!nlh)
5226                 return -EMSGSIZE;
5227
5228         hdr = nlmsg_data(nlh);
5229         hdr->ifi_family = AF_INET6;
5230         hdr->__ifi_pad = 0;
5231         hdr->ifi_type = dev->type;
5232         hdr->ifi_index = dev->ifindex;
5233         hdr->ifi_flags = dev_get_flags(dev);
5234         hdr->ifi_change = 0;
5235
5236         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5237             (dev->addr_len &&
5238              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5239             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5240             (dev->ifindex != dev_get_iflink(dev) &&
5241              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5242             nla_put_u8(skb, IFLA_OPERSTATE,
5243                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5244                 goto nla_put_failure;
5245         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5246         if (!protoinfo)
5247                 goto nla_put_failure;
5248
5249         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5250                 goto nla_put_failure;
5251
5252         nla_nest_end(skb, protoinfo);
5253         nlmsg_end(skb, nlh);
5254         return 0;
5255
5256 nla_put_failure:
5257         nlmsg_cancel(skb, nlh);
5258         return -EMSGSIZE;
5259 }
5260
5261 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5262 {
5263         struct net *net = sock_net(skb->sk);
5264         int h, s_h;
5265         int idx = 0, s_idx;
5266         struct net_device *dev;
5267         struct inet6_dev *idev;
5268         struct hlist_head *head;
5269
5270         s_h = cb->args[0];
5271         s_idx = cb->args[1];
5272
5273         rcu_read_lock();
5274         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5275                 idx = 0;
5276                 head = &net->dev_index_head[h];
5277                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5278                         if (idx < s_idx)
5279                                 goto cont;
5280                         idev = __in6_dev_get(dev);
5281                         if (!idev)
5282                                 goto cont;
5283                         if (inet6_fill_ifinfo(skb, idev,
5284                                               NETLINK_CB(cb->skb).portid,
5285                                               cb->nlh->nlmsg_seq,
5286                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5287                                 goto out;
5288 cont:
5289                         idx++;
5290                 }
5291         }
5292 out:
5293         rcu_read_unlock();
5294         cb->args[1] = idx;
5295         cb->args[0] = h;
5296
5297         return skb->len;
5298 }
5299
5300 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5301 {
5302         struct sk_buff *skb;
5303         struct net *net = dev_net(idev->dev);
5304         int err = -ENOBUFS;
5305
5306         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5307         if (!skb)
5308                 goto errout;
5309
5310         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5311         if (err < 0) {
5312                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5313                 WARN_ON(err == -EMSGSIZE);
5314                 kfree_skb(skb);
5315                 goto errout;
5316         }
5317         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5318         return;
5319 errout:
5320         if (err < 0)
5321                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5322 }
5323
5324 static inline size_t inet6_prefix_nlmsg_size(void)
5325 {
5326         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5327                + nla_total_size(sizeof(struct in6_addr))
5328                + nla_total_size(sizeof(struct prefix_cacheinfo));
5329 }
5330
5331 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5332                              struct prefix_info *pinfo, u32 portid, u32 seq,
5333                              int event, unsigned int flags)
5334 {
5335         struct prefixmsg *pmsg;
5336         struct nlmsghdr *nlh;
5337         struct prefix_cacheinfo ci;
5338
5339         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5340         if (!nlh)
5341                 return -EMSGSIZE;
5342
5343         pmsg = nlmsg_data(nlh);
5344         pmsg->prefix_family = AF_INET6;
5345         pmsg->prefix_pad1 = 0;
5346         pmsg->prefix_pad2 = 0;
5347         pmsg->prefix_ifindex = idev->dev->ifindex;
5348         pmsg->prefix_len = pinfo->prefix_len;
5349         pmsg->prefix_type = pinfo->type;
5350         pmsg->prefix_pad3 = 0;
5351         pmsg->prefix_flags = 0;
5352         if (pinfo->onlink)
5353                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5354         if (pinfo->autoconf)
5355                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5356
5357         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5358                 goto nla_put_failure;
5359         ci.preferred_time = ntohl(pinfo->prefered);
5360         ci.valid_time = ntohl(pinfo->valid);
5361         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5362                 goto nla_put_failure;
5363         nlmsg_end(skb, nlh);
5364         return 0;
5365
5366 nla_put_failure:
5367         nlmsg_cancel(skb, nlh);
5368         return -EMSGSIZE;
5369 }
5370
5371 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5372                          struct prefix_info *pinfo)
5373 {
5374         struct sk_buff *skb;
5375         struct net *net = dev_net(idev->dev);
5376         int err = -ENOBUFS;
5377
5378         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5379         if (!skb)
5380                 goto errout;
5381
5382         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5383         if (err < 0) {
5384                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5385                 WARN_ON(err == -EMSGSIZE);
5386                 kfree_skb(skb);
5387                 goto errout;
5388         }
5389         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5390         return;
5391 errout:
5392         if (err < 0)
5393                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5394 }
5395
5396 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5397 {
5398         struct net *net = dev_net(ifp->idev->dev);
5399
5400         if (event)
5401                 ASSERT_RTNL();
5402
5403         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5404
5405         switch (event) {
5406         case RTM_NEWADDR:
5407                 /*
5408                  * If the address was optimistic
5409                  * we inserted the route at the start of
5410                  * our DAD process, so we don't need
5411                  * to do it again
5412                  */
5413                 if (!(ifp->rt->rt6i_node))
5414                         ip6_ins_rt(ifp->rt);
5415                 if (ifp->idev->cnf.forwarding)
5416                         addrconf_join_anycast(ifp);
5417                 if (!ipv6_addr_any(&ifp->peer_addr))
5418                         addrconf_prefix_route(&ifp->peer_addr, 128,
5419                                               ifp->idev->dev, 0, 0);
5420                 break;
5421         case RTM_DELADDR:
5422                 if (ifp->idev->cnf.forwarding)
5423                         addrconf_leave_anycast(ifp);
5424                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5425                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5426                         struct rt6_info *rt;
5427
5428                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5429                                                        ifp->idev->dev, 0, 0);
5430                         if (rt)
5431                                 ip6_del_rt(rt);
5432                 }
5433                 if (ifp->rt) {
5434                         dst_hold(&ifp->rt->dst);
5435                         ip6_del_rt(ifp->rt);
5436                 }
5437                 rt_genid_bump_ipv6(net);
5438                 break;
5439         }
5440         atomic_inc(&net->ipv6.dev_addr_genid);
5441 }
5442
5443 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5444 {
5445         rcu_read_lock_bh();
5446         if (likely(ifp->idev->dead == 0))
5447                 __ipv6_ifa_notify(event, ifp);
5448         rcu_read_unlock_bh();
5449 }
5450
5451 #ifdef CONFIG_SYSCTL
5452
5453 static
5454 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5455                            void __user *buffer, size_t *lenp, loff_t *ppos)
5456 {
5457         int *valp = ctl->data;
5458         int val = *valp;
5459         loff_t pos = *ppos;
5460         struct ctl_table lctl;
5461         int ret;
5462
5463         /*
5464          * ctl->data points to idev->cnf.forwarding, we should
5465          * not modify it until we get the rtnl lock.
5466          */
5467         lctl = *ctl;
5468         lctl.data = &val;
5469
5470         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5471
5472         if (write)
5473                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5474         if (ret)
5475                 *ppos = pos;
5476         return ret;
5477 }
5478
5479 static
5480 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5481                         void __user *buffer, size_t *lenp, loff_t *ppos)
5482 {
5483         struct inet6_dev *idev = ctl->extra1;
5484         int min_mtu = IPV6_MIN_MTU;
5485         struct ctl_table lctl;
5486
5487         lctl = *ctl;
5488         lctl.extra1 = &min_mtu;
5489         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5490
5491         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5492 }
5493
5494 static void dev_disable_change(struct inet6_dev *idev)
5495 {
5496         struct netdev_notifier_info info;
5497
5498         if (!idev || !idev->dev)
5499                 return;
5500
5501         netdev_notifier_info_init(&info, idev->dev);
5502         if (idev->cnf.disable_ipv6)
5503                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5504         else
5505                 addrconf_notify(NULL, NETDEV_UP, &info);
5506 }
5507
5508 static void addrconf_disable_change(struct net *net, __s32 newf)
5509 {
5510         struct net_device *dev;
5511         struct inet6_dev *idev;
5512
5513         rcu_read_lock();
5514         for_each_netdev_rcu(net, dev) {
5515                 idev = __in6_dev_get(dev);
5516                 if (idev) {
5517                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5518                         idev->cnf.disable_ipv6 = newf;
5519                         if (changed)
5520                                 dev_disable_change(idev);
5521                 }
5522         }
5523         rcu_read_unlock();
5524 }
5525
5526 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5527 {
5528         struct net *net;
5529         int old;
5530
5531         if (!rtnl_trylock())
5532                 return restart_syscall();
5533
5534         net = (struct net *)table->extra2;
5535         old = *p;
5536         *p = newf;
5537
5538         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5539                 rtnl_unlock();
5540                 return 0;
5541         }
5542
5543         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5544                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5545                 addrconf_disable_change(net, newf);
5546         } else if ((!newf) ^ (!old))
5547                 dev_disable_change((struct inet6_dev *)table->extra1);
5548
5549         rtnl_unlock();
5550         return 0;
5551 }
5552
5553 static
5554 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5555                             void __user *buffer, size_t *lenp, loff_t *ppos)
5556 {
5557         int *valp = ctl->data;
5558         int val = *valp;
5559         loff_t pos = *ppos;
5560         struct ctl_table lctl;
5561         int ret;
5562
5563         /*
5564          * ctl->data points to idev->cnf.disable_ipv6, we should
5565          * not modify it until we get the rtnl lock.
5566          */
5567         lctl = *ctl;
5568         lctl.data = &val;
5569
5570         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5571
5572         if (write)
5573                 ret = addrconf_disable_ipv6(ctl, valp, val);
5574         if (ret)
5575                 *ppos = pos;
5576         return ret;
5577 }
5578
5579 static
5580 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5581                               void __user *buffer, size_t *lenp, loff_t *ppos)
5582 {
5583         int *valp = ctl->data;
5584         int ret;
5585         int old, new;
5586
5587         old = *valp;
5588         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5589         new = *valp;
5590
5591         if (write && old != new) {
5592                 struct net *net = ctl->extra2;
5593
5594                 if (!rtnl_trylock())
5595                         return restart_syscall();
5596
5597                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5598                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5599                                                      NETCONFA_IFINDEX_DEFAULT,
5600                                                      net->ipv6.devconf_dflt);
5601                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5602                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5603                                                      NETCONFA_IFINDEX_ALL,
5604                                                      net->ipv6.devconf_all);
5605                 else {
5606                         struct inet6_dev *idev = ctl->extra1;
5607
5608                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5609                                                      idev->dev->ifindex,
5610                                                      &idev->cnf);
5611                 }
5612                 rtnl_unlock();
5613         }
5614
5615         return ret;
5616 }
5617
5618 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5619                                          void __user *buffer, size_t *lenp,
5620                                          loff_t *ppos)
5621 {
5622         int err;
5623         struct in6_addr addr;
5624         char str[IPV6_MAX_STRLEN];
5625         struct ctl_table lctl = *ctl;
5626         struct net *net = ctl->extra2;
5627         struct ipv6_stable_secret *secret = ctl->data;
5628
5629         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5630                 return -EIO;
5631
5632         lctl.maxlen = IPV6_MAX_STRLEN;
5633         lctl.data = str;
5634
5635         if (!rtnl_trylock())
5636                 return restart_syscall();
5637
5638         if (!write && !secret->initialized) {
5639                 err = -EIO;
5640                 goto out;
5641         }
5642
5643         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5644         if (err >= sizeof(str)) {
5645                 err = -EIO;
5646                 goto out;
5647         }
5648
5649         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5650         if (err || !write)
5651                 goto out;
5652
5653         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5654                 err = -EIO;
5655                 goto out;
5656         }
5657
5658         secret->initialized = true;
5659         secret->secret = addr;
5660
5661         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5662                 struct net_device *dev;
5663
5664                 for_each_netdev(net, dev) {
5665                         struct inet6_dev *idev = __in6_dev_get(dev);
5666
5667                         if (idev) {
5668                                 idev->addr_gen_mode =
5669                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5670                         }
5671                 }
5672         } else {
5673                 struct inet6_dev *idev = ctl->extra1;
5674
5675                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5676         }
5677
5678 out:
5679         rtnl_unlock();
5680
5681         return err;
5682 }
5683
5684 static
5685 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5686                                                 int write,
5687                                                 void __user *buffer,
5688                                                 size_t *lenp,
5689                                                 loff_t *ppos)
5690 {
5691         int *valp = ctl->data;
5692         int val = *valp;
5693         loff_t pos = *ppos;
5694         struct ctl_table lctl;
5695         int ret;
5696
5697         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5698          * we should not modify it until we get the rtnl lock.
5699          */
5700         lctl = *ctl;
5701         lctl.data = &val;
5702
5703         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5704
5705         if (write)
5706                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5707         if (ret)
5708                 *ppos = pos;
5709         return ret;
5710 }
5711
5712 static int minus_one = -1;
5713 static const int one = 1;
5714 static const int two_five_five = 255;
5715
5716 static const struct ctl_table addrconf_sysctl[] = {
5717         {
5718                 .procname       = "forwarding",
5719                 .data           = &ipv6_devconf.forwarding,
5720                 .maxlen         = sizeof(int),
5721                 .mode           = 0644,
5722                 .proc_handler   = addrconf_sysctl_forward,
5723         },
5724         {
5725                 .procname       = "hop_limit",
5726                 .data           = &ipv6_devconf.hop_limit,
5727                 .maxlen         = sizeof(int),
5728                 .mode           = 0644,
5729                 .proc_handler   = proc_dointvec_minmax,
5730                 .extra1         = (void *)&one,
5731                 .extra2         = (void *)&two_five_five,
5732         },
5733         {
5734                 .procname       = "mtu",
5735                 .data           = &ipv6_devconf.mtu6,
5736                 .maxlen         = sizeof(int),
5737                 .mode           = 0644,
5738                 .proc_handler   = addrconf_sysctl_mtu,
5739         },
5740         {
5741                 .procname       = "accept_ra",
5742                 .data           = &ipv6_devconf.accept_ra,
5743                 .maxlen         = sizeof(int),
5744                 .mode           = 0644,
5745                 .proc_handler   = proc_dointvec,
5746         },
5747         {
5748                 .procname       = "accept_redirects",
5749                 .data           = &ipv6_devconf.accept_redirects,
5750                 .maxlen         = sizeof(int),
5751                 .mode           = 0644,
5752                 .proc_handler   = proc_dointvec,
5753         },
5754         {
5755                 .procname       = "autoconf",
5756                 .data           = &ipv6_devconf.autoconf,
5757                 .maxlen         = sizeof(int),
5758                 .mode           = 0644,
5759                 .proc_handler   = proc_dointvec,
5760         },
5761         {
5762                 .procname       = "dad_transmits",
5763                 .data           = &ipv6_devconf.dad_transmits,
5764                 .maxlen         = sizeof(int),
5765                 .mode           = 0644,
5766                 .proc_handler   = proc_dointvec,
5767         },
5768         {
5769                 .procname       = "router_solicitations",
5770                 .data           = &ipv6_devconf.rtr_solicits,
5771                 .maxlen         = sizeof(int),
5772                 .mode           = 0644,
5773                 .proc_handler   = proc_dointvec_minmax,
5774                 .extra1         = &minus_one,
5775         },
5776         {
5777                 .procname       = "router_solicitation_interval",
5778                 .data           = &ipv6_devconf.rtr_solicit_interval,
5779                 .maxlen         = sizeof(int),
5780                 .mode           = 0644,
5781                 .proc_handler   = proc_dointvec_jiffies,
5782         },
5783         {
5784                 .procname       = "router_solicitation_max_interval",
5785                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
5786                 .maxlen         = sizeof(int),
5787                 .mode           = 0644,
5788                 .proc_handler   = proc_dointvec_jiffies,
5789         },
5790         {
5791                 .procname       = "router_solicitation_delay",
5792                 .data           = &ipv6_devconf.rtr_solicit_delay,
5793                 .maxlen         = sizeof(int),
5794                 .mode           = 0644,
5795                 .proc_handler   = proc_dointvec_jiffies,
5796         },
5797         {
5798                 .procname       = "force_mld_version",
5799                 .data           = &ipv6_devconf.force_mld_version,
5800                 .maxlen         = sizeof(int),
5801                 .mode           = 0644,
5802                 .proc_handler   = proc_dointvec,
5803         },
5804         {
5805                 .procname       = "mldv1_unsolicited_report_interval",
5806                 .data           =
5807                         &ipv6_devconf.mldv1_unsolicited_report_interval,
5808                 .maxlen         = sizeof(int),
5809                 .mode           = 0644,
5810                 .proc_handler   = proc_dointvec_ms_jiffies,
5811         },
5812         {
5813                 .procname       = "mldv2_unsolicited_report_interval",
5814                 .data           =
5815                         &ipv6_devconf.mldv2_unsolicited_report_interval,
5816                 .maxlen         = sizeof(int),
5817                 .mode           = 0644,
5818                 .proc_handler   = proc_dointvec_ms_jiffies,
5819         },
5820         {
5821                 .procname       = "use_tempaddr",
5822                 .data           = &ipv6_devconf.use_tempaddr,
5823                 .maxlen         = sizeof(int),
5824                 .mode           = 0644,
5825                 .proc_handler   = proc_dointvec,
5826         },
5827         {
5828                 .procname       = "temp_valid_lft",
5829                 .data           = &ipv6_devconf.temp_valid_lft,
5830                 .maxlen         = sizeof(int),
5831                 .mode           = 0644,
5832                 .proc_handler   = proc_dointvec,
5833         },
5834         {
5835                 .procname       = "temp_prefered_lft",
5836                 .data           = &ipv6_devconf.temp_prefered_lft,
5837                 .maxlen         = sizeof(int),
5838                 .mode           = 0644,
5839                 .proc_handler   = proc_dointvec,
5840         },
5841         {
5842                 .procname       = "regen_max_retry",
5843                 .data           = &ipv6_devconf.regen_max_retry,
5844                 .maxlen         = sizeof(int),
5845                 .mode           = 0644,
5846                 .proc_handler   = proc_dointvec,
5847         },
5848         {
5849                 .procname       = "max_desync_factor",
5850                 .data           = &ipv6_devconf.max_desync_factor,
5851                 .maxlen         = sizeof(int),
5852                 .mode           = 0644,
5853                 .proc_handler   = proc_dointvec,
5854         },
5855         {
5856                 .procname       = "max_addresses",
5857                 .data           = &ipv6_devconf.max_addresses,
5858                 .maxlen         = sizeof(int),
5859                 .mode           = 0644,
5860                 .proc_handler   = proc_dointvec,
5861         },
5862         {
5863                 .procname       = "accept_ra_defrtr",
5864                 .data           = &ipv6_devconf.accept_ra_defrtr,
5865                 .maxlen         = sizeof(int),
5866                 .mode           = 0644,
5867                 .proc_handler   = proc_dointvec,
5868         },
5869         {
5870                 .procname       = "accept_ra_min_hop_limit",
5871                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5872                 .maxlen         = sizeof(int),
5873                 .mode           = 0644,
5874                 .proc_handler   = proc_dointvec,
5875         },
5876         {
5877                 .procname       = "accept_ra_pinfo",
5878                 .data           = &ipv6_devconf.accept_ra_pinfo,
5879                 .maxlen         = sizeof(int),
5880                 .mode           = 0644,
5881                 .proc_handler   = proc_dointvec,
5882         },
5883 #ifdef CONFIG_IPV6_ROUTER_PREF
5884         {
5885                 .procname       = "accept_ra_rtr_pref",
5886                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
5887                 .maxlen         = sizeof(int),
5888                 .mode           = 0644,
5889                 .proc_handler   = proc_dointvec,
5890         },
5891         {
5892                 .procname       = "router_probe_interval",
5893                 .data           = &ipv6_devconf.rtr_probe_interval,
5894                 .maxlen         = sizeof(int),
5895                 .mode           = 0644,
5896                 .proc_handler   = proc_dointvec_jiffies,
5897         },
5898 #ifdef CONFIG_IPV6_ROUTE_INFO
5899         {
5900                 .procname       = "accept_ra_rt_info_max_plen",
5901                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5902                 .maxlen         = sizeof(int),
5903                 .mode           = 0644,
5904                 .proc_handler   = proc_dointvec,
5905         },
5906 #endif
5907 #endif
5908         {
5909                 .procname       = "proxy_ndp",
5910                 .data           = &ipv6_devconf.proxy_ndp,
5911                 .maxlen         = sizeof(int),
5912                 .mode           = 0644,
5913                 .proc_handler   = addrconf_sysctl_proxy_ndp,
5914         },
5915         {
5916                 .procname       = "accept_source_route",
5917                 .data           = &ipv6_devconf.accept_source_route,
5918                 .maxlen         = sizeof(int),
5919                 .mode           = 0644,
5920                 .proc_handler   = proc_dointvec,
5921         },
5922 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5923         {
5924                 .procname       = "optimistic_dad",
5925                 .data           = &ipv6_devconf.optimistic_dad,
5926                 .maxlen         = sizeof(int),
5927                 .mode           = 0644,
5928                 .proc_handler   = proc_dointvec,
5929         },
5930         {
5931                 .procname       = "use_optimistic",
5932                 .data           = &ipv6_devconf.use_optimistic,
5933                 .maxlen         = sizeof(int),
5934                 .mode           = 0644,
5935                 .proc_handler   = proc_dointvec,
5936         },
5937 #endif
5938 #ifdef CONFIG_IPV6_MROUTE
5939         {
5940                 .procname       = "mc_forwarding",
5941                 .data           = &ipv6_devconf.mc_forwarding,
5942                 .maxlen         = sizeof(int),
5943                 .mode           = 0444,
5944                 .proc_handler   = proc_dointvec,
5945         },
5946 #endif
5947         {
5948                 .procname       = "disable_ipv6",
5949                 .data           = &ipv6_devconf.disable_ipv6,
5950                 .maxlen         = sizeof(int),
5951                 .mode           = 0644,
5952                 .proc_handler   = addrconf_sysctl_disable,
5953         },
5954         {
5955                 .procname       = "accept_dad",
5956                 .data           = &ipv6_devconf.accept_dad,
5957                 .maxlen         = sizeof(int),
5958                 .mode           = 0644,
5959                 .proc_handler   = proc_dointvec,
5960         },
5961         {
5962                 .procname       = "force_tllao",
5963                 .data           = &ipv6_devconf.force_tllao,
5964                 .maxlen         = sizeof(int),
5965                 .mode           = 0644,
5966                 .proc_handler   = proc_dointvec
5967         },
5968         {
5969                 .procname       = "ndisc_notify",
5970                 .data           = &ipv6_devconf.ndisc_notify,
5971                 .maxlen         = sizeof(int),
5972                 .mode           = 0644,
5973                 .proc_handler   = proc_dointvec
5974         },
5975         {
5976                 .procname       = "suppress_frag_ndisc",
5977                 .data           = &ipv6_devconf.suppress_frag_ndisc,
5978                 .maxlen         = sizeof(int),
5979                 .mode           = 0644,
5980                 .proc_handler   = proc_dointvec
5981         },
5982         {
5983                 .procname       = "accept_ra_from_local",
5984                 .data           = &ipv6_devconf.accept_ra_from_local,
5985                 .maxlen         = sizeof(int),
5986                 .mode           = 0644,
5987                 .proc_handler   = proc_dointvec,
5988         },
5989         {
5990                 .procname       = "accept_ra_mtu",
5991                 .data           = &ipv6_devconf.accept_ra_mtu,
5992                 .maxlen         = sizeof(int),
5993                 .mode           = 0644,
5994                 .proc_handler   = proc_dointvec,
5995         },
5996         {
5997                 .procname       = "stable_secret",
5998                 .data           = &ipv6_devconf.stable_secret,
5999                 .maxlen         = IPV6_MAX_STRLEN,
6000                 .mode           = 0600,
6001                 .proc_handler   = addrconf_sysctl_stable_secret,
6002         },
6003         {
6004                 .procname       = "use_oif_addrs_only",
6005                 .data           = &ipv6_devconf.use_oif_addrs_only,
6006                 .maxlen         = sizeof(int),
6007                 .mode           = 0644,
6008                 .proc_handler   = proc_dointvec,
6009         },
6010         {
6011                 .procname       = "ignore_routes_with_linkdown",
6012                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6013                 .maxlen         = sizeof(int),
6014                 .mode           = 0644,
6015                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6016         },
6017         {
6018                 .procname       = "drop_unicast_in_l2_multicast",
6019                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6020                 .maxlen         = sizeof(int),
6021                 .mode           = 0644,
6022                 .proc_handler   = proc_dointvec,
6023         },
6024         {
6025                 .procname       = "drop_unsolicited_na",
6026                 .data           = &ipv6_devconf.drop_unsolicited_na,
6027                 .maxlen         = sizeof(int),
6028                 .mode           = 0644,
6029                 .proc_handler   = proc_dointvec,
6030         },
6031         {
6032                 .procname       = "keep_addr_on_down",
6033                 .data           = &ipv6_devconf.keep_addr_on_down,
6034                 .maxlen         = sizeof(int),
6035                 .mode           = 0644,
6036                 .proc_handler   = proc_dointvec,
6037
6038         },
6039         {
6040                 /* sentinel */
6041         }
6042 };
6043
6044 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6045                 struct inet6_dev *idev, struct ipv6_devconf *p)
6046 {
6047         int i, ifindex;
6048         struct ctl_table *table;
6049         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6050
6051         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6052         if (!table)
6053                 goto out;
6054
6055         for (i = 0; table[i].data; i++) {
6056                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6057                 /* If one of these is already set, then it is not safe to
6058                  * overwrite either of them: this makes proc_dointvec_minmax
6059                  * usable.
6060                  */
6061                 if (!table[i].extra1 && !table[i].extra2) {
6062                         table[i].extra1 = idev; /* embedded; no ref */
6063                         table[i].extra2 = net;
6064                 }
6065         }
6066
6067         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6068
6069         p->sysctl_header = register_net_sysctl(net, path, table);
6070         if (!p->sysctl_header)
6071                 goto free;
6072
6073         if (!strcmp(dev_name, "all"))
6074                 ifindex = NETCONFA_IFINDEX_ALL;
6075         else if (!strcmp(dev_name, "default"))
6076                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6077         else
6078                 ifindex = idev->dev->ifindex;
6079         inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6080         return 0;
6081
6082 free:
6083         kfree(table);
6084 out:
6085         return -ENOBUFS;
6086 }
6087
6088 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6089 {
6090         struct ctl_table *table;
6091
6092         if (!p->sysctl_header)
6093                 return;
6094
6095         table = p->sysctl_header->ctl_table_arg;
6096         unregister_net_sysctl_table(p->sysctl_header);
6097         p->sysctl_header = NULL;
6098         kfree(table);
6099 }
6100
6101 static int addrconf_sysctl_register(struct inet6_dev *idev)
6102 {
6103         int err;
6104
6105         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6106                 return -EINVAL;
6107
6108         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6109                                     &ndisc_ifinfo_sysctl_change);
6110         if (err)
6111                 return err;
6112         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6113                                          idev, &idev->cnf);
6114         if (err)
6115                 neigh_sysctl_unregister(idev->nd_parms);
6116
6117         return err;
6118 }
6119
6120 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6121 {
6122         __addrconf_sysctl_unregister(&idev->cnf);
6123         neigh_sysctl_unregister(idev->nd_parms);
6124 }
6125
6126
6127 #endif
6128
6129 static int __net_init addrconf_init_net(struct net *net)
6130 {
6131         int err = -ENOMEM;
6132         struct ipv6_devconf *all, *dflt;
6133
6134         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6135         if (!all)
6136                 goto err_alloc_all;
6137
6138         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6139         if (!dflt)
6140                 goto err_alloc_dflt;
6141
6142         /* these will be inherited by all namespaces */
6143         dflt->autoconf = ipv6_defaults.autoconf;
6144         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6145
6146         dflt->stable_secret.initialized = false;
6147         all->stable_secret.initialized = false;
6148
6149         net->ipv6.devconf_all = all;
6150         net->ipv6.devconf_dflt = dflt;
6151
6152 #ifdef CONFIG_SYSCTL
6153         err = __addrconf_sysctl_register(net, "all", NULL, all);
6154         if (err < 0)
6155                 goto err_reg_all;
6156
6157         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6158         if (err < 0)
6159                 goto err_reg_dflt;
6160 #endif
6161         return 0;
6162
6163 #ifdef CONFIG_SYSCTL
6164 err_reg_dflt:
6165         __addrconf_sysctl_unregister(all);
6166 err_reg_all:
6167         kfree(dflt);
6168 #endif
6169 err_alloc_dflt:
6170         kfree(all);
6171 err_alloc_all:
6172         return err;
6173 }
6174
6175 static void __net_exit addrconf_exit_net(struct net *net)
6176 {
6177 #ifdef CONFIG_SYSCTL
6178         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6179         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6180 #endif
6181         kfree(net->ipv6.devconf_dflt);
6182         kfree(net->ipv6.devconf_all);
6183 }
6184
6185 static struct pernet_operations addrconf_ops = {
6186         .init = addrconf_init_net,
6187         .exit = addrconf_exit_net,
6188 };
6189
6190 static struct rtnl_af_ops inet6_ops __read_mostly = {
6191         .family           = AF_INET6,
6192         .fill_link_af     = inet6_fill_link_af,
6193         .get_link_af_size = inet6_get_link_af_size,
6194         .validate_link_af = inet6_validate_link_af,
6195         .set_link_af      = inet6_set_link_af,
6196 };
6197
6198 /*
6199  *      Init / cleanup code
6200  */
6201
6202 int __init addrconf_init(void)
6203 {
6204         struct inet6_dev *idev;
6205         int i, err;
6206
6207         err = ipv6_addr_label_init();
6208         if (err < 0) {
6209                 pr_crit("%s: cannot initialize default policy table: %d\n",
6210                         __func__, err);
6211                 goto out;
6212         }
6213
6214         err = register_pernet_subsys(&addrconf_ops);
6215         if (err < 0)
6216                 goto out_addrlabel;
6217
6218         addrconf_wq = create_workqueue("ipv6_addrconf");
6219         if (!addrconf_wq) {
6220                 err = -ENOMEM;
6221                 goto out_nowq;
6222         }
6223
6224         /* The addrconf netdev notifier requires that loopback_dev
6225          * has it's ipv6 private information allocated and setup
6226          * before it can bring up and give link-local addresses
6227          * to other devices which are up.
6228          *
6229          * Unfortunately, loopback_dev is not necessarily the first
6230          * entry in the global dev_base list of net devices.  In fact,
6231          * it is likely to be the very last entry on that list.
6232          * So this causes the notifier registry below to try and
6233          * give link-local addresses to all devices besides loopback_dev
6234          * first, then loopback_dev, which cases all the non-loopback_dev
6235          * devices to fail to get a link-local address.
6236          *
6237          * So, as a temporary fix, allocate the ipv6 structure for
6238          * loopback_dev first by hand.
6239          * Longer term, all of the dependencies ipv6 has upon the loopback
6240          * device and it being up should be removed.
6241          */
6242         rtnl_lock();
6243         idev = ipv6_add_dev(init_net.loopback_dev);
6244         rtnl_unlock();
6245         if (IS_ERR(idev)) {
6246                 err = PTR_ERR(idev);
6247                 goto errlo;
6248         }
6249
6250         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6251                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6252
6253         register_netdevice_notifier(&ipv6_dev_notf);
6254
6255         addrconf_verify();
6256
6257         rtnl_af_register(&inet6_ops);
6258
6259         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6260                               NULL);
6261         if (err < 0)
6262                 goto errout;
6263
6264         /* Only the first call to __rtnl_register can fail */
6265         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6266         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6267         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6268                         inet6_dump_ifaddr, NULL);
6269         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6270                         inet6_dump_ifmcaddr, NULL);
6271         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6272                         inet6_dump_ifacaddr, NULL);
6273         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6274                         inet6_netconf_dump_devconf, NULL);
6275
6276         ipv6_addr_label_rtnl_register();
6277
6278         return 0;
6279 errout:
6280         rtnl_af_unregister(&inet6_ops);
6281         unregister_netdevice_notifier(&ipv6_dev_notf);
6282 errlo:
6283         destroy_workqueue(addrconf_wq);
6284 out_nowq:
6285         unregister_pernet_subsys(&addrconf_ops);
6286 out_addrlabel:
6287         ipv6_addr_label_cleanup();
6288 out:
6289         return err;
6290 }
6291
6292 void addrconf_cleanup(void)
6293 {
6294         struct net_device *dev;
6295         int i;
6296
6297         unregister_netdevice_notifier(&ipv6_dev_notf);
6298         unregister_pernet_subsys(&addrconf_ops);
6299         ipv6_addr_label_cleanup();
6300
6301         rtnl_lock();
6302
6303         __rtnl_af_unregister(&inet6_ops);
6304
6305         /* clean dev list */
6306         for_each_netdev(&init_net, dev) {
6307                 if (__in6_dev_get(dev) == NULL)
6308                         continue;
6309                 addrconf_ifdown(dev, 1);
6310         }
6311         addrconf_ifdown(init_net.loopback_dev, 2);
6312
6313         /*
6314          *      Check hash table.
6315          */
6316         spin_lock_bh(&addrconf_hash_lock);
6317         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6318                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6319         spin_unlock_bh(&addrconf_hash_lock);
6320         cancel_delayed_work(&addr_chk_work);
6321         rtnl_unlock();
6322
6323         destroy_workqueue(addrconf_wq);
6324 }