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/sched/signal.h>
  47 #include <linux/socket.h>
  48 #include <linux/sockios.h>
  49 #include <linux/net.h>
  50 #include <linux/inet.h>
  51 #include <linux/in6.h>
  52 #include <linux/netdevice.h>
  53 #include <linux/if_addr.h>
  54 #include <linux/if_arp.h>
  55 #include <linux/if_arcnet.h>
  56 #include <linux/if_infiniband.h>
  57 #include <linux/route.h>
  58 #include <linux/inetdevice.h>
  59 #include <linux/init.h>
  60 #include <linux/slab.h>
  61 #ifdef CONFIG_SYSCTL
  62 #include <linux/sysctl.h>
  63 #endif
  64 #include <linux/capability.h>
  65 #include <linux/delay.h>
  66 #include <linux/notifier.h>
  67 #include <linux/string.h>
  68 #include <linux/hash.h>
  69
  70 #include <net/net_namespace.h>
  71 #include <net/sock.h>
  72 #include <net/snmp.h>
  73
  74 #include <net/6lowpan.h>
  75 #include <net/firewire.h>
  76 #include <net/ipv6.h>
  77 #include <net/protocol.h>
  78 #include <net/ndisc.h>
  79 #include <net/ip6_route.h>
  80 #include <net/addrconf.h>
  81 #include <net/tcp.h>
  82 #include <net/ip.h>
  83 #include <net/netlink.h>
  84 #include <net/pkt_sched.h>
  85 #include <net/l3mdev.h>
  86 #include <linux/if_tunnel.h>
  87 #include <linux/rtnetlink.h>
  88 #include <linux/netconf.h>
  89 #include <linux/random.h>
  90 #include <linux/uaccess.h>
  91 #include <asm/unaligned.h>
  92
  93 #include <linux/proc_fs.h>
  94 #include <linux/seq_file.h>
  95 #include <linux/export.h>
  96
  97 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  98
  99 #define IPV6_MAX_STRLEN \
 100         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
 101
 102 static inline u32 cstamp_delta(unsigned long cstamp)
 103 {
 104         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 105 }
 106
 107 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 108 {
 109         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 110         u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
 111         do_div(tmp, 1000000);
 112         return (s32)tmp;
 113 }
 114
 115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 116 {
 117         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 118         u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
 119         do_div(tmp, 1000000);
 120         if ((s32)tmp > mrt) {
 121                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 122                 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
 123                 do_div(tmp, 1000000);
 124         }
 125         return (s32)tmp;
 126 }
 127
 128 #ifdef CONFIG_SYSCTL
 129 static int addrconf_sysctl_register(struct inet6_dev *idev);
 130 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 131 #else
 132 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 133 {
 134         return 0;
 135 }
 136
 137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 138 {
 139 }
 140 #endif
 141
 142 static void ipv6_regen_rndid(struct inet6_dev *idev);
 143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 144
 145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 146 static int ipv6_count_addresses(const struct inet6_dev *idev);
 147 static int ipv6_generate_stable_address(struct in6_addr *addr,
 148                                         u8 dad_count,
 149                                         const struct inet6_dev *idev);
 150
 151 #define IN6_ADDR_HSIZE_SHIFT    8
 152 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
 153 /*
 154  *      Configured unicast address hash table
 155  */
 156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 157 static DEFINE_SPINLOCK(addrconf_hash_lock);
 158
 159 static void addrconf_verify(void);
 160 static void addrconf_verify_rtnl(void);
 161 static void addrconf_verify_work(struct work_struct *);
 162
 163 static struct workqueue_struct *addrconf_wq;
 164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 165
 166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 168
 169 static void addrconf_type_change(struct net_device *dev,
 170                                  unsigned long event);
 171 static int addrconf_ifdown(struct net_device *dev, int how);
 172
 173 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 174                                                   int plen,
 175                                                   const struct net_device *dev,
 176                                                   u32 flags, u32 noflags);
 177
 178 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 179 static void addrconf_dad_work(struct work_struct *w);
 180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
 181                                    bool send_na);
 182 static void addrconf_dad_run(struct inet6_dev *idev);
 183 static void addrconf_rs_timer(struct timer_list *t);
 184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 186
 187 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 188                                 struct prefix_info *pinfo);
 189
 190 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 191         .forwarding             = 0,
 192         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 193         .mtu6                   = IPV6_MIN_MTU,
 194         .accept_ra              = 1,
 195         .accept_redirects       = 1,
 196         .autoconf               = 1,
 197         .force_mld_version      = 0,
 198         .mldv1_unsolicited_report_interval = 10 * HZ,
 199         .mldv2_unsolicited_report_interval = HZ,
 200         .dad_transmits          = 1,
 201         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 202         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 203         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 204         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 205         .use_tempaddr           = 0,
 206         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 207         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 208         .regen_max_retry        = REGEN_MAX_RETRY,
 209         .max_desync_factor      = MAX_DESYNC_FACTOR,
 210         .max_addresses          = IPV6_MAX_ADDRESSES,
 211         .accept_ra_defrtr       = 1,
 212         .accept_ra_from_local   = 0,
 213         .accept_ra_min_hop_limit= 1,
 214         .accept_ra_pinfo        = 1,
 215 #ifdef CONFIG_IPV6_ROUTER_PREF
 216         .accept_ra_rtr_pref     = 1,
 217         .rtr_probe_interval     = 60 * HZ,
 218 #ifdef CONFIG_IPV6_ROUTE_INFO
 219         .accept_ra_rt_info_min_plen = 0,
 220         .accept_ra_rt_info_max_plen = 0,
 221 #endif
 222 #endif
 223         .proxy_ndp              = 0,
 224         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 225         .disable_ipv6           = 0,
 226         .accept_dad             = 0,
 227         .suppress_frag_ndisc    = 1,
 228         .accept_ra_mtu          = 1,
 229         .stable_secret          = {
 230                 .initialized = false,
 231         },
 232         .use_oif_addrs_only     = 0,
 233         .ignore_routes_with_linkdown = 0,
 234         .keep_addr_on_down      = 0,
 235         .seg6_enabled           = 0,
 236 #ifdef CONFIG_IPV6_SEG6_HMAC
 237         .seg6_require_hmac      = 0,
 238 #endif
 239         .enhanced_dad           = 1,
 240         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 241         .disable_policy         = 0,
 242 };
 243
 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 245         .forwarding             = 0,
 246         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 247         .mtu6                   = IPV6_MIN_MTU,
 248         .accept_ra              = 1,
 249         .accept_redirects       = 1,
 250         .autoconf               = 1,
 251         .force_mld_version      = 0,
 252         .mldv1_unsolicited_report_interval = 10 * HZ,
 253         .mldv2_unsolicited_report_interval = HZ,
 254         .dad_transmits          = 1,
 255         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 256         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 257         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 258         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 259         .use_tempaddr           = 0,
 260         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 261         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 262         .regen_max_retry        = REGEN_MAX_RETRY,
 263         .max_desync_factor      = MAX_DESYNC_FACTOR,
 264         .max_addresses          = IPV6_MAX_ADDRESSES,
 265         .accept_ra_defrtr       = 1,
 266         .accept_ra_from_local   = 0,
 267         .accept_ra_min_hop_limit= 1,
 268         .accept_ra_pinfo        = 1,
 269 #ifdef CONFIG_IPV6_ROUTER_PREF
 270         .accept_ra_rtr_pref     = 1,
 271         .rtr_probe_interval     = 60 * HZ,
 272 #ifdef CONFIG_IPV6_ROUTE_INFO
 273         .accept_ra_rt_info_min_plen = 0,
 274         .accept_ra_rt_info_max_plen = 0,
 275 #endif
 276 #endif
 277         .proxy_ndp              = 0,
 278         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 279         .disable_ipv6           = 0,
 280         .accept_dad             = 1,
 281         .suppress_frag_ndisc    = 1,
 282         .accept_ra_mtu          = 1,
 283         .stable_secret          = {
 284                 .initialized = false,
 285         },
 286         .use_oif_addrs_only     = 0,
 287         .ignore_routes_with_linkdown = 0,
 288         .keep_addr_on_down      = 0,
 289         .seg6_enabled           = 0,
 290 #ifdef CONFIG_IPV6_SEG6_HMAC
 291         .seg6_require_hmac      = 0,
 292 #endif
 293         .enhanced_dad           = 1,
 294         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 295         .disable_policy         = 0,
 296 };
 297
 298 /* Check if link is ready: is it up and is a valid qdisc available */
 299 static inline bool addrconf_link_ready(const struct net_device *dev)
 300 {
 301         return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
 302 }
 303
 304 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 305 {
 306         if (del_timer(&idev->rs_timer))
 307                 __in6_dev_put(idev);
 308 }
 309
 310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 311 {
 312         if (cancel_delayed_work(&ifp->dad_work))
 313                 __in6_ifa_put(ifp);
 314 }
 315
 316 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 317                                   unsigned long when)
 318 {
 319         if (!timer_pending(&idev->rs_timer))
 320                 in6_dev_hold(idev);
 321         mod_timer(&idev->rs_timer, jiffies + when);
 322 }
 323
 324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 325                                    unsigned long delay)
 326 {
 327         in6_ifa_hold(ifp);
 328         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 329                 in6_ifa_put(ifp);
 330 }
 331
 332 static int snmp6_alloc_dev(struct inet6_dev *idev)
 333 {
 334         int i;
 335
 336         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 337         if (!idev->stats.ipv6)
 338                 goto err_ip;
 339
 340         for_each_possible_cpu(i) {
 341                 struct ipstats_mib *addrconf_stats;
 342                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 343                 u64_stats_init(&addrconf_stats->syncp);
 344         }
 345
 346
 347         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 348                                         GFP_KERNEL);
 349         if (!idev->stats.icmpv6dev)
 350                 goto err_icmp;
 351         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 352                                            GFP_KERNEL);
 353         if (!idev->stats.icmpv6msgdev)
 354                 goto err_icmpmsg;
 355
 356         return 0;
 357
 358 err_icmpmsg:
 359         kfree(idev->stats.icmpv6dev);
 360 err_icmp:
 361         free_percpu(idev->stats.ipv6);
 362 err_ip:
 363         return -ENOMEM;
 364 }
 365
 366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 367 {
 368         struct inet6_dev *ndev;
 369         int err = -ENOMEM;
 370
 371         ASSERT_RTNL();
 372
 373         if (dev->mtu < IPV6_MIN_MTU)
 374                 return ERR_PTR(-EINVAL);
 375
 376         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 377         if (!ndev)
 378                 return ERR_PTR(err);
 379
 380         rwlock_init(&ndev->lock);
 381         ndev->dev = dev;
 382         INIT_LIST_HEAD(&ndev->addr_list);
 383         timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
 384         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 385
 386         if (ndev->cnf.stable_secret.initialized)
 387                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 388         else
 389                 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
 390
 391         ndev->cnf.mtu6 = dev->mtu;
 392         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 393         if (!ndev->nd_parms) {
 394                 kfree(ndev);
 395                 return ERR_PTR(err);
 396         }
 397         if (ndev->cnf.forwarding)
 398                 dev_disable_lro(dev);
 399         /* We refer to the device */
 400         dev_hold(dev);
 401
 402         if (snmp6_alloc_dev(ndev) < 0) {
 403                 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
 404                            __func__);
 405                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 406                 dev_put(dev);
 407                 kfree(ndev);
 408                 return ERR_PTR(err);
 409         }
 410
 411         if (snmp6_register_dev(ndev) < 0) {
 412                 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
 413                            __func__, dev->name);
 414                 goto err_release;
 415         }
 416
 417         /* One reference from device. */
 418         refcount_set(&ndev->refcnt, 1);
 419
 420         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 421                 ndev->cnf.accept_dad = -1;
 422
 423 #if IS_ENABLED(CONFIG_IPV6_SIT)
 424         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 425                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 426                 ndev->cnf.rtr_solicits = 0;
 427         }
 428 #endif
 429
 430         INIT_LIST_HEAD(&ndev->tempaddr_list);
 431         ndev->desync_factor = U32_MAX;
 432         if ((dev->flags&IFF_LOOPBACK) ||
 433             dev->type == ARPHRD_TUNNEL ||
 434             dev->type == ARPHRD_TUNNEL6 ||
 435             dev->type == ARPHRD_SIT ||
 436             dev->type == ARPHRD_NONE) {
 437                 ndev->cnf.use_tempaddr = -1;
 438         } else
 439                 ipv6_regen_rndid(ndev);
 440
 441         ndev->token = in6addr_any;
 442
 443         if (netif_running(dev) && addrconf_link_ready(dev))
 444                 ndev->if_flags |= IF_READY;
 445
 446         ipv6_mc_init_dev(ndev);
 447         ndev->tstamp = jiffies;
 448         err = addrconf_sysctl_register(ndev);
 449         if (err) {
 450                 ipv6_mc_destroy_dev(ndev);
 451                 snmp6_unregister_dev(ndev);
 452                 goto err_release;
 453         }
 454         /* protected by rtnl_lock */
 455         rcu_assign_pointer(dev->ip6_ptr, ndev);
 456
 457         /* Join interface-local all-node multicast group */
 458         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 459
 460         /* Join all-node multicast group */
 461         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 462
 463         /* Join all-router multicast group if forwarding is set */
 464         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 465                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 466
 467         return ndev;
 468
 469 err_release:
 470         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 471         ndev->dead = 1;
 472         in6_dev_finish_destroy(ndev);
 473         return ERR_PTR(err);
 474 }
 475
 476 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 477 {
 478         struct inet6_dev *idev;
 479
 480         ASSERT_RTNL();
 481
 482         idev = __in6_dev_get(dev);
 483         if (!idev) {
 484                 idev = ipv6_add_dev(dev);
 485                 if (IS_ERR(idev))
 486                         return NULL;
 487         }
 488
 489         if (dev->flags&IFF_UP)
 490                 ipv6_mc_up(idev);
 491         return idev;
 492 }
 493
 494 static int inet6_netconf_msgsize_devconf(int type)
 495 {
 496         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 497                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 498         bool all = false;
 499
 500         if (type == NETCONFA_ALL)
 501                 all = true;
 502
 503         if (all || type == NETCONFA_FORWARDING)
 504                 size += nla_total_size(4);
 505 #ifdef CONFIG_IPV6_MROUTE
 506         if (all || type == NETCONFA_MC_FORWARDING)
 507                 size += nla_total_size(4);
 508 #endif
 509         if (all || type == NETCONFA_PROXY_NEIGH)
 510                 size += nla_total_size(4);
 511
 512         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 513                 size += nla_total_size(4);
 514
 515         return size;
 516 }
 517
 518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 519                                       struct ipv6_devconf *devconf, u32 portid,
 520                                       u32 seq, int event, unsigned int flags,
 521                                       int type)
 522 {
 523         struct nlmsghdr  *nlh;
 524         struct netconfmsg *ncm;
 525         bool all = false;
 526
 527         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 528                         flags);
 529         if (!nlh)
 530                 return -EMSGSIZE;
 531
 532         if (type == NETCONFA_ALL)
 533                 all = true;
 534
 535         ncm = nlmsg_data(nlh);
 536         ncm->ncm_family = AF_INET6;
 537
 538         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 539                 goto nla_put_failure;
 540
 541         if (!devconf)
 542                 goto out;
 543
 544         if ((all || type == NETCONFA_FORWARDING) &&
 545             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 546                 goto nla_put_failure;
 547 #ifdef CONFIG_IPV6_MROUTE
 548         if ((all || type == NETCONFA_MC_FORWARDING) &&
 549             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 550                         devconf->mc_forwarding) < 0)
 551                 goto nla_put_failure;
 552 #endif
 553         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 554             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 555                 goto nla_put_failure;
 556
 557         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 558             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 559                         devconf->ignore_routes_with_linkdown) < 0)
 560                 goto nla_put_failure;
 561
 562 out:
 563         nlmsg_end(skb, nlh);
 564         return 0;
 565
 566 nla_put_failure:
 567         nlmsg_cancel(skb, nlh);
 568         return -EMSGSIZE;
 569 }
 570
 571 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 572                                   int ifindex, struct ipv6_devconf *devconf)
 573 {
 574         struct sk_buff *skb;
 575         int err = -ENOBUFS;
 576
 577         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 578         if (!skb)
 579                 goto errout;
 580
 581         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 582                                          event, 0, type);
 583         if (err < 0) {
 584                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 585                 WARN_ON(err == -EMSGSIZE);
 586                 kfree_skb(skb);
 587                 goto errout;
 588         }
 589         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 590         return;
 591 errout:
 592         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 593 }
 594
 595 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 596         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 597         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 598         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 599         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 600 };
 601
 602 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 603                                      struct nlmsghdr *nlh,
 604                                      struct netlink_ext_ack *extack)
 605 {
 606         struct net *net = sock_net(in_skb->sk);
 607         struct nlattr *tb[NETCONFA_MAX+1];
 608         struct inet6_dev *in6_dev = NULL;
 609         struct net_device *dev = NULL;
 610         struct netconfmsg *ncm;
 611         struct sk_buff *skb;
 612         struct ipv6_devconf *devconf;
 613         int ifindex;
 614         int err;
 615
 616         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 617                           devconf_ipv6_policy, extack);
 618         if (err < 0)
 619                 return err;
 620
 621         if (!tb[NETCONFA_IFINDEX])
 622                 return -EINVAL;
 623
 624         err = -EINVAL;
 625         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 626         switch (ifindex) {
 627         case NETCONFA_IFINDEX_ALL:
 628                 devconf = net->ipv6.devconf_all;
 629                 break;
 630         case NETCONFA_IFINDEX_DEFAULT:
 631                 devconf = net->ipv6.devconf_dflt;
 632                 break;
 633         default:
 634                 dev = dev_get_by_index(net, ifindex);
 635                 if (!dev)
 636                         return -EINVAL;
 637                 in6_dev = in6_dev_get(dev);
 638                 if (!in6_dev)
 639                         goto errout;
 640                 devconf = &in6_dev->cnf;
 641                 break;
 642         }
 643
 644         err = -ENOBUFS;
 645         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
 646         if (!skb)
 647                 goto errout;
 648
 649         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 650                                          NETLINK_CB(in_skb).portid,
 651                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 652                                          NETCONFA_ALL);
 653         if (err < 0) {
 654                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 655                 WARN_ON(err == -EMSGSIZE);
 656                 kfree_skb(skb);
 657                 goto errout;
 658         }
 659         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 660 errout:
 661         if (in6_dev)
 662                 in6_dev_put(in6_dev);
 663         if (dev)
 664                 dev_put(dev);
 665         return err;
 666 }
 667
 668 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 669                                       struct netlink_callback *cb)
 670 {
 671         struct net *net = sock_net(skb->sk);
 672         int h, s_h;
 673         int idx, s_idx;
 674         struct net_device *dev;
 675         struct inet6_dev *idev;
 676         struct hlist_head *head;
 677
 678         s_h = cb->args[0];
 679         s_idx = idx = cb->args[1];
 680
 681         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 682                 idx = 0;
 683                 head = &net->dev_index_head[h];
 684                 rcu_read_lock();
 685                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 686                           net->dev_base_seq;
 687                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 688                         if (idx < s_idx)
 689                                 goto cont;
 690                         idev = __in6_dev_get(dev);
 691                         if (!idev)
 692                                 goto cont;
 693
 694                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 695                                                        &idev->cnf,
 696                                                        NETLINK_CB(cb->skb).portid,
 697                                                        cb->nlh->nlmsg_seq,
 698                                                        RTM_NEWNETCONF,
 699                                                        NLM_F_MULTI,
 700                                                        NETCONFA_ALL) < 0) {
 701                                 rcu_read_unlock();
 702                                 goto done;
 703                         }
 704                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 705 cont:
 706                         idx++;
 707                 }
 708                 rcu_read_unlock();
 709         }
 710         if (h == NETDEV_HASHENTRIES) {
 711                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 712                                                net->ipv6.devconf_all,
 713                                                NETLINK_CB(cb->skb).portid,
 714                                                cb->nlh->nlmsg_seq,
 715                                                RTM_NEWNETCONF, NLM_F_MULTI,
 716                                                NETCONFA_ALL) < 0)
 717                         goto done;
 718                 else
 719                         h++;
 720         }
 721         if (h == NETDEV_HASHENTRIES + 1) {
 722                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 723                                                net->ipv6.devconf_dflt,
 724                                                NETLINK_CB(cb->skb).portid,
 725                                                cb->nlh->nlmsg_seq,
 726                                                RTM_NEWNETCONF, NLM_F_MULTI,
 727                                                NETCONFA_ALL) < 0)
 728                         goto done;
 729                 else
 730                         h++;
 731         }
 732 done:
 733         cb->args[0] = h;
 734         cb->args[1] = idx;
 735
 736         return skb->len;
 737 }
 738
 739 #ifdef CONFIG_SYSCTL
 740 static void dev_forward_change(struct inet6_dev *idev)
 741 {
 742         struct net_device *dev;
 743         struct inet6_ifaddr *ifa;
 744
 745         if (!idev)
 746                 return;
 747         dev = idev->dev;
 748         if (idev->cnf.forwarding)
 749                 dev_disable_lro(dev);
 750         if (dev->flags & IFF_MULTICAST) {
 751                 if (idev->cnf.forwarding) {
 752                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 753                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 754                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 755                 } else {
 756                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 757                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 758                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 759                 }
 760         }
 761
 762         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 763                 if (ifa->flags&IFA_F_TENTATIVE)
 764                         continue;
 765                 if (idev->cnf.forwarding)
 766                         addrconf_join_anycast(ifa);
 767                 else
 768                         addrconf_leave_anycast(ifa);
 769         }
 770         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 771                                      NETCONFA_FORWARDING,
 772                                      dev->ifindex, &idev->cnf);
 773 }
 774
 775
 776 static void addrconf_forward_change(struct net *net, __s32 newf)
 777 {
 778         struct net_device *dev;
 779         struct inet6_dev *idev;
 780
 781         for_each_netdev(net, dev) {
 782                 idev = __in6_dev_get(dev);
 783                 if (idev) {
 784                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 785                         idev->cnf.forwarding = newf;
 786                         if (changed)
 787                                 dev_forward_change(idev);
 788                 }
 789         }
 790 }
 791
 792 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 793 {
 794         struct net *net;
 795         int old;
 796
 797         if (!rtnl_trylock())
 798                 return restart_syscall();
 799
 800         net = (struct net *)table->extra2;
 801         old = *p;
 802         *p = newf;
 803
 804         if (p == &net->ipv6.devconf_dflt->forwarding) {
 805                 if ((!newf) ^ (!old))
 806                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 807                                                      NETCONFA_FORWARDING,
 808                                                      NETCONFA_IFINDEX_DEFAULT,
 809                                                      net->ipv6.devconf_dflt);
 810                 rtnl_unlock();
 811                 return 0;
 812         }
 813
 814         if (p == &net->ipv6.devconf_all->forwarding) {
 815                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 816
 817                 net->ipv6.devconf_dflt->forwarding = newf;
 818                 if ((!newf) ^ (!old_dflt))
 819                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 820                                                      NETCONFA_FORWARDING,
 821                                                      NETCONFA_IFINDEX_DEFAULT,
 822                                                      net->ipv6.devconf_dflt);
 823
 824                 addrconf_forward_change(net, newf);
 825                 if ((!newf) ^ (!old))
 826                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 827                                                      NETCONFA_FORWARDING,
 828                                                      NETCONFA_IFINDEX_ALL,
 829                                                      net->ipv6.devconf_all);
 830         } else if ((!newf) ^ (!old))
 831                 dev_forward_change((struct inet6_dev *)table->extra1);
 832         rtnl_unlock();
 833
 834         if (newf)
 835                 rt6_purge_dflt_routers(net);
 836         return 1;
 837 }
 838
 839 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 840 {
 841         struct net_device *dev;
 842         struct inet6_dev *idev;
 843
 844         for_each_netdev(net, dev) {
 845                 idev = __in6_dev_get(dev);
 846                 if (idev) {
 847                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 848
 849                         idev->cnf.ignore_routes_with_linkdown = newf;
 850                         if (changed)
 851                                 inet6_netconf_notify_devconf(dev_net(dev),
 852                                                              RTM_NEWNETCONF,
 853                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 854                                                              dev->ifindex,
 855                                                              &idev->cnf);
 856                 }
 857         }
 858 }
 859
 860 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 861 {
 862         struct net *net;
 863         int old;
 864
 865         if (!rtnl_trylock())
 866                 return restart_syscall();
 867
 868         net = (struct net *)table->extra2;
 869         old = *p;
 870         *p = newf;
 871
 872         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 873                 if ((!newf) ^ (!old))
 874                         inet6_netconf_notify_devconf(net,
 875                                                      RTM_NEWNETCONF,
 876                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 877                                                      NETCONFA_IFINDEX_DEFAULT,
 878                                                      net->ipv6.devconf_dflt);
 879                 rtnl_unlock();
 880                 return 0;
 881         }
 882
 883         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 884                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 885                 addrconf_linkdown_change(net, newf);
 886                 if ((!newf) ^ (!old))
 887                         inet6_netconf_notify_devconf(net,
 888                                                      RTM_NEWNETCONF,
 889                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 890                                                      NETCONFA_IFINDEX_ALL,
 891                                                      net->ipv6.devconf_all);
 892         }
 893         rtnl_unlock();
 894
 895         return 1;
 896 }
 897
 898 #endif
 899
 900 /* Nobody refers to this ifaddr, destroy it */
 901 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 902 {
 903         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 904
 905 #ifdef NET_REFCNT_DEBUG
 906         pr_debug("%s\n", __func__);
 907 #endif
 908
 909         in6_dev_put(ifp->idev);
 910
 911         if (cancel_delayed_work(&ifp->dad_work))
 912                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 913                           ifp);
 914
 915         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 916                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 917                 return;
 918         }
 919         ip6_rt_put(ifp->rt);
 920
 921         kfree_rcu(ifp, rcu);
 922 }
 923
 924 static void
 925 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 926 {
 927         struct list_head *p;
 928         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 929
 930         /*
 931          * Each device address list is sorted in order of scope -
 932          * global before linklocal.
 933          */
 934         list_for_each(p, &idev->addr_list) {
 935                 struct inet6_ifaddr *ifa
 936                         = list_entry(p, struct inet6_ifaddr, if_list);
 937                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 938                         break;
 939         }
 940
 941         list_add_tail_rcu(&ifp->if_list, p);
 942 }
 943
 944 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
 945 {
 946         u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
 947
 948         return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
 949 }
 950
 951 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 952                                struct net_device *dev, unsigned int hash)
 953 {
 954         struct inet6_ifaddr *ifp;
 955
 956         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
 957                 if (!net_eq(dev_net(ifp->idev->dev), net))
 958                         continue;
 959                 if (ipv6_addr_equal(&ifp->addr, addr)) {
 960                         if (!dev || ifp->idev->dev == dev)
 961                                 return true;
 962                 }
 963         }
 964         return false;
 965 }
 966
 967 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
 968 {
 969         unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
 970         int err = 0;
 971
 972         spin_lock(&addrconf_hash_lock);
 973
 974         /* Ignore adding duplicate addresses on an interface */
 975         if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
 976                 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
 977                 err = -EEXIST;
 978         } else {
 979                 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 980         }
 981
 982         spin_unlock(&addrconf_hash_lock);
 983
 984         return err;
 985 }
 986
 987 /* On success it returns ifp with increased reference count */
 988
 989 static struct inet6_ifaddr *
 990 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 991               const struct in6_addr *peer_addr, int pfxlen,
 992               int scope, u32 flags, u32 valid_lft, u32 prefered_lft,
 993               bool can_block, struct netlink_ext_ack *extack)
 994 {
 995         gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
 996         struct net *net = dev_net(idev->dev);
 997         struct inet6_ifaddr *ifa = NULL;
 998         struct rt6_info *rt = NULL;
 999         int err = 0;
1000         int addr_type = ipv6_addr_type(addr);
1001
1002         if (addr_type == IPV6_ADDR_ANY ||
1003             addr_type & IPV6_ADDR_MULTICAST ||
1004             (!(idev->dev->flags & IFF_LOOPBACK) &&
1005              addr_type & IPV6_ADDR_LOOPBACK))
1006                 return ERR_PTR(-EADDRNOTAVAIL);
1007
1008         if (idev->dead) {
1009                 err = -ENODEV;                  /*XXX*/
1010                 goto out;
1011         }
1012
1013         if (idev->cnf.disable_ipv6) {
1014                 err = -EACCES;
1015                 goto out;
1016         }
1017
1018         /* validator notifier needs to be blocking;
1019          * do not call in atomic context
1020          */
1021         if (can_block) {
1022                 struct in6_validator_info i6vi = {
1023                         .i6vi_addr = *addr,
1024                         .i6vi_dev = idev,
1025                         .extack = extack,
1026                 };
1027
1028                 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1029                 err = notifier_to_errno(err);
1030                 if (err < 0)
1031                         goto out;
1032         }
1033
1034         ifa = kzalloc(sizeof(*ifa), gfp_flags);
1035         if (!ifa) {
1036                 err = -ENOBUFS;
1037                 goto out;
1038         }
1039
1040         rt = addrconf_dst_alloc(net, idev, addr, false);
1041         if (IS_ERR(rt)) {
1042                 err = PTR_ERR(rt);
1043                 rt = NULL;
1044                 goto out;
1045         }
1046
1047         if (net->ipv6.devconf_all->disable_policy ||
1048             idev->cnf.disable_policy)
1049                 rt->dst_nopolicy = true;
1050
1051         neigh_parms_data_state_setall(idev->nd_parms);
1052
1053         ifa->addr = *addr;
1054         if (peer_addr)
1055                 ifa->peer_addr = *peer_addr;
1056
1057         spin_lock_init(&ifa->lock);
1058         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1059         INIT_HLIST_NODE(&ifa->addr_lst);
1060         ifa->scope = scope;
1061         ifa->prefix_len = pfxlen;
1062         ifa->flags = flags;
1063         /* No need to add the TENTATIVE flag for addresses with NODAD */
1064         if (!(flags & IFA_F_NODAD))
1065                 ifa->flags |= IFA_F_TENTATIVE;
1066         ifa->valid_lft = valid_lft;
1067         ifa->prefered_lft = prefered_lft;
1068         ifa->cstamp = ifa->tstamp = jiffies;
1069         ifa->tokenized = false;
1070
1071         ifa->rt = rt;
1072
1073         ifa->idev = idev;
1074         in6_dev_hold(idev);
1075
1076         /* For caller */
1077         refcount_set(&ifa->refcnt, 1);
1078
1079         rcu_read_lock_bh();
1080
1081         err = ipv6_add_addr_hash(idev->dev, ifa);
1082         if (err < 0) {
1083                 rcu_read_unlock_bh();
1084                 goto out;
1085         }
1086
1087         write_lock(&idev->lock);
1088
1089         /* Add to inet6_dev unicast addr list. */
1090         ipv6_link_dev_addr(idev, ifa);
1091
1092         if (ifa->flags&IFA_F_TEMPORARY) {
1093                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1094                 in6_ifa_hold(ifa);
1095         }
1096
1097         in6_ifa_hold(ifa);
1098         write_unlock(&idev->lock);
1099
1100         rcu_read_unlock_bh();
1101
1102         inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1103 out:
1104         if (unlikely(err < 0)) {
1105                 if (rt)
1106                         ip6_rt_put(rt);
1107                 if (ifa) {
1108                         if (ifa->idev)
1109                                 in6_dev_put(ifa->idev);
1110                         kfree(ifa);
1111                 }
1112                 ifa = ERR_PTR(err);
1113         }
1114
1115         return ifa;
1116 }
1117
1118 enum cleanup_prefix_rt_t {
1119         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1120         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1121         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1122 };
1123
1124 /*
1125  * Check, whether the prefix for ifp would still need a prefix route
1126  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1127  * constants.
1128  *
1129  * 1) we don't purge prefix if address was not permanent.
1130  *    prefix is managed by its own lifetime.
1131  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1132  * 3) if there are no addresses, delete prefix.
1133  * 4) if there are still other permanent address(es),
1134  *    corresponding prefix is still permanent.
1135  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1136  *    don't purge the prefix, assume user space is managing it.
1137  * 6) otherwise, update prefix lifetime to the
1138  *    longest valid lifetime among the corresponding
1139  *    addresses on the device.
1140  *    Note: subsequent RA will update lifetime.
1141  **/
1142 static enum cleanup_prefix_rt_t
1143 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1144 {
1145         struct inet6_ifaddr *ifa;
1146         struct inet6_dev *idev = ifp->idev;
1147         unsigned long lifetime;
1148         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1149
1150         *expires = jiffies;
1151
1152         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1153                 if (ifa == ifp)
1154                         continue;
1155                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1156                                        ifp->prefix_len))
1157                         continue;
1158                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1159                         return CLEANUP_PREFIX_RT_NOP;
1160
1161                 action = CLEANUP_PREFIX_RT_EXPIRE;
1162
1163                 spin_lock(&ifa->lock);
1164
1165                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1166                 /*
1167                  * Note: Because this address is
1168                  * not permanent, lifetime <
1169                  * LONG_MAX / HZ here.
1170                  */
1171                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1172                         *expires = ifa->tstamp + lifetime * HZ;
1173                 spin_unlock(&ifa->lock);
1174         }
1175
1176         return action;
1177 }
1178
1179 static void
1180 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1181 {
1182         struct rt6_info *rt;
1183
1184         rt = addrconf_get_prefix_route(&ifp->addr,
1185                                        ifp->prefix_len,
1186                                        ifp->idev->dev,
1187                                        0, RTF_GATEWAY | RTF_DEFAULT);
1188         if (rt) {
1189                 if (del_rt)
1190                         ip6_del_rt(dev_net(ifp->idev->dev), rt);
1191                 else {
1192                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1193                                 fib6_set_expires(rt, expires);
1194                         ip6_rt_put(rt);
1195                 }
1196         }
1197 }
1198
1199
1200 /* This function wants to get referenced ifp and releases it before return */
1201
1202 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1203 {
1204         int state;
1205         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1206         unsigned long expires;
1207
1208         ASSERT_RTNL();
1209
1210         spin_lock_bh(&ifp->lock);
1211         state = ifp->state;
1212         ifp->state = INET6_IFADDR_STATE_DEAD;
1213         spin_unlock_bh(&ifp->lock);
1214
1215         if (state == INET6_IFADDR_STATE_DEAD)
1216                 goto out;
1217
1218         spin_lock_bh(&addrconf_hash_lock);
1219         hlist_del_init_rcu(&ifp->addr_lst);
1220         spin_unlock_bh(&addrconf_hash_lock);
1221
1222         write_lock_bh(&ifp->idev->lock);
1223
1224         if (ifp->flags&IFA_F_TEMPORARY) {
1225                 list_del(&ifp->tmp_list);
1226                 if (ifp->ifpub) {
1227                         in6_ifa_put(ifp->ifpub);
1228                         ifp->ifpub = NULL;
1229                 }
1230                 __in6_ifa_put(ifp);
1231         }
1232
1233         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1234                 action = check_cleanup_prefix_route(ifp, &expires);
1235
1236         list_del_rcu(&ifp->if_list);
1237         __in6_ifa_put(ifp);
1238
1239         write_unlock_bh(&ifp->idev->lock);
1240
1241         addrconf_del_dad_work(ifp);
1242
1243         ipv6_ifa_notify(RTM_DELADDR, ifp);
1244
1245         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1246
1247         if (action != CLEANUP_PREFIX_RT_NOP) {
1248                 cleanup_prefix_route(ifp, expires,
1249                         action == CLEANUP_PREFIX_RT_DEL);
1250         }
1251
1252         /* clean up prefsrc entries */
1253         rt6_remove_prefsrc(ifp);
1254 out:
1255         in6_ifa_put(ifp);
1256 }
1257
1258 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1259                                 struct inet6_ifaddr *ift,
1260                                 bool block)
1261 {
1262         struct inet6_dev *idev = ifp->idev;
1263         struct in6_addr addr, *tmpaddr;
1264         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1265         unsigned long regen_advance;
1266         int tmp_plen;
1267         int ret = 0;
1268         u32 addr_flags;
1269         unsigned long now = jiffies;
1270         long max_desync_factor;
1271         s32 cnf_temp_preferred_lft;
1272
1273         write_lock_bh(&idev->lock);
1274         if (ift) {
1275                 spin_lock_bh(&ift->lock);
1276                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1277                 spin_unlock_bh(&ift->lock);
1278                 tmpaddr = &addr;
1279         } else {
1280                 tmpaddr = NULL;
1281         }
1282 retry:
1283         in6_dev_hold(idev);
1284         if (idev->cnf.use_tempaddr <= 0) {
1285                 write_unlock_bh(&idev->lock);
1286                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1287                 in6_dev_put(idev);
1288                 ret = -1;
1289                 goto out;
1290         }
1291         spin_lock_bh(&ifp->lock);
1292         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1293                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1294                 spin_unlock_bh(&ifp->lock);
1295                 write_unlock_bh(&idev->lock);
1296                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1297                         __func__);
1298                 in6_dev_put(idev);
1299                 ret = -1;
1300                 goto out;
1301         }
1302         in6_ifa_hold(ifp);
1303         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1304         ipv6_try_regen_rndid(idev, tmpaddr);
1305         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1306         age = (now - ifp->tstamp) / HZ;
1307
1308         regen_advance = idev->cnf.regen_max_retry *
1309                         idev->cnf.dad_transmits *
1310                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1311
1312         /* recalculate max_desync_factor each time and update
1313          * idev->desync_factor if it's larger
1314          */
1315         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1316         max_desync_factor = min_t(__u32,
1317                                   idev->cnf.max_desync_factor,
1318                                   cnf_temp_preferred_lft - regen_advance);
1319
1320         if (unlikely(idev->desync_factor > max_desync_factor)) {
1321                 if (max_desync_factor > 0) {
1322                         get_random_bytes(&idev->desync_factor,
1323                                          sizeof(idev->desync_factor));
1324                         idev->desync_factor %= max_desync_factor;
1325                 } else {
1326                         idev->desync_factor = 0;
1327                 }
1328         }
1329
1330         tmp_valid_lft = min_t(__u32,
1331                               ifp->valid_lft,
1332                               idev->cnf.temp_valid_lft + age);
1333         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1334                             idev->desync_factor;
1335         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1336         tmp_plen = ifp->prefix_len;
1337         tmp_tstamp = ifp->tstamp;
1338         spin_unlock_bh(&ifp->lock);
1339
1340         write_unlock_bh(&idev->lock);
1341
1342         /* A temporary address is created only if this calculated Preferred
1343          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1344          * an implementation must not create a temporary address with a zero
1345          * Preferred Lifetime.
1346          * Use age calculation as in addrconf_verify to avoid unnecessary
1347          * temporary addresses being generated.
1348          */
1349         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1350         if (tmp_prefered_lft <= regen_advance + age) {
1351                 in6_ifa_put(ifp);
1352                 in6_dev_put(idev);
1353                 ret = -1;
1354                 goto out;
1355         }
1356
1357         addr_flags = IFA_F_TEMPORARY;
1358         /* set in addrconf_prefix_rcv() */
1359         if (ifp->flags & IFA_F_OPTIMISTIC)
1360                 addr_flags |= IFA_F_OPTIMISTIC;
1361
1362         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1363                             ipv6_addr_scope(&addr), addr_flags,
1364                             tmp_valid_lft, tmp_prefered_lft, block, NULL);
1365         if (IS_ERR(ift)) {
1366                 in6_ifa_put(ifp);
1367                 in6_dev_put(idev);
1368                 pr_info("%s: retry temporary address regeneration\n", __func__);
1369                 tmpaddr = &addr;
1370                 write_lock_bh(&idev->lock);
1371                 goto retry;
1372         }
1373
1374         spin_lock_bh(&ift->lock);
1375         ift->ifpub = ifp;
1376         ift->cstamp = now;
1377         ift->tstamp = tmp_tstamp;
1378         spin_unlock_bh(&ift->lock);
1379
1380         addrconf_dad_start(ift);
1381         in6_ifa_put(ift);
1382         in6_dev_put(idev);
1383 out:
1384         return ret;
1385 }
1386
1387 /*
1388  *      Choose an appropriate source address (RFC3484)
1389  */
1390 enum {
1391         IPV6_SADDR_RULE_INIT = 0,
1392         IPV6_SADDR_RULE_LOCAL,
1393         IPV6_SADDR_RULE_SCOPE,
1394         IPV6_SADDR_RULE_PREFERRED,
1395 #ifdef CONFIG_IPV6_MIP6
1396         IPV6_SADDR_RULE_HOA,
1397 #endif
1398         IPV6_SADDR_RULE_OIF,
1399         IPV6_SADDR_RULE_LABEL,
1400         IPV6_SADDR_RULE_PRIVACY,
1401         IPV6_SADDR_RULE_ORCHID,
1402         IPV6_SADDR_RULE_PREFIX,
1403 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1404         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1405 #endif
1406         IPV6_SADDR_RULE_MAX
1407 };
1408
1409 struct ipv6_saddr_score {
1410         int                     rule;
1411         int                     addr_type;
1412         struct inet6_ifaddr     *ifa;
1413         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1414         int                     scopedist;
1415         int                     matchlen;
1416 };
1417
1418 struct ipv6_saddr_dst {
1419         const struct in6_addr *addr;
1420         int ifindex;
1421         int scope;
1422         int label;
1423         unsigned int prefs;
1424 };
1425
1426 static inline int ipv6_saddr_preferred(int type)
1427 {
1428         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1429                 return 1;
1430         return 0;
1431 }
1432
1433 static bool ipv6_use_optimistic_addr(struct net *net,
1434                                      struct inet6_dev *idev)
1435 {
1436 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1437         if (!idev)
1438                 return false;
1439         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1440                 return false;
1441         if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1442                 return false;
1443
1444         return true;
1445 #else
1446         return false;
1447 #endif
1448 }
1449
1450 static bool ipv6_allow_optimistic_dad(struct net *net,
1451                                       struct inet6_dev *idev)
1452 {
1453 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1454         if (!idev)
1455                 return false;
1456         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1457                 return false;
1458
1459         return true;
1460 #else
1461         return false;
1462 #endif
1463 }
1464
1465 static int ipv6_get_saddr_eval(struct net *net,
1466                                struct ipv6_saddr_score *score,
1467                                struct ipv6_saddr_dst *dst,
1468                                int i)
1469 {
1470         int ret;
1471
1472         if (i <= score->rule) {
1473                 switch (i) {
1474                 case IPV6_SADDR_RULE_SCOPE:
1475                         ret = score->scopedist;
1476                         break;
1477                 case IPV6_SADDR_RULE_PREFIX:
1478                         ret = score->matchlen;
1479                         break;
1480                 default:
1481                         ret = !!test_bit(i, score->scorebits);
1482                 }
1483                 goto out;
1484         }
1485
1486         switch (i) {
1487         case IPV6_SADDR_RULE_INIT:
1488                 /* Rule 0: remember if hiscore is not ready yet */
1489                 ret = !!score->ifa;
1490                 break;
1491         case IPV6_SADDR_RULE_LOCAL:
1492                 /* Rule 1: Prefer same address */
1493                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1494                 break;
1495         case IPV6_SADDR_RULE_SCOPE:
1496                 /* Rule 2: Prefer appropriate scope
1497                  *
1498                  *      ret
1499                  *       ^
1500                  *    -1 |  d 15
1501                  *    ---+--+-+---> scope
1502                  *       |
1503                  *       |             d is scope of the destination.
1504                  *  B-d  |  \
1505                  *       |   \      <- smaller scope is better if
1506                  *  B-15 |    \        if scope is enough for destination.
1507                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1508                  * d-C-1 | /
1509                  *       |/         <- greater is better
1510                  *   -C  /             if scope is not enough for destination.
1511                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1512                  *
1513                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1514                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1515                  * Assume B = 0 and we get C > 29.
1516                  */
1517                 ret = __ipv6_addr_src_scope(score->addr_type);
1518                 if (ret >= dst->scope)
1519                         ret = -ret;
1520                 else
1521                         ret -= 128;     /* 30 is enough */
1522                 score->scopedist = ret;
1523                 break;
1524         case IPV6_SADDR_RULE_PREFERRED:
1525             {
1526                 /* Rule 3: Avoid deprecated and optimistic addresses */
1527                 u8 avoid = IFA_F_DEPRECATED;
1528
1529                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1530                         avoid |= IFA_F_OPTIMISTIC;
1531                 ret = ipv6_saddr_preferred(score->addr_type) ||
1532                       !(score->ifa->flags & avoid);
1533                 break;
1534             }
1535 #ifdef CONFIG_IPV6_MIP6
1536         case IPV6_SADDR_RULE_HOA:
1537             {
1538                 /* Rule 4: Prefer home address */
1539                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1540                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1541                 break;
1542             }
1543 #endif
1544         case IPV6_SADDR_RULE_OIF:
1545                 /* Rule 5: Prefer outgoing interface */
1546                 ret = (!dst->ifindex ||
1547                        dst->ifindex == score->ifa->idev->dev->ifindex);
1548                 break;
1549         case IPV6_SADDR_RULE_LABEL:
1550                 /* Rule 6: Prefer matching label */
1551                 ret = ipv6_addr_label(net,
1552                                       &score->ifa->addr, score->addr_type,
1553                                       score->ifa->idev->dev->ifindex) == dst->label;
1554                 break;
1555         case IPV6_SADDR_RULE_PRIVACY:
1556             {
1557                 /* Rule 7: Prefer public address
1558                  * Note: prefer temporary address if use_tempaddr >= 2
1559                  */
1560                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1561                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1562                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1563                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1564                 break;
1565             }
1566         case IPV6_SADDR_RULE_ORCHID:
1567                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1568                  *          non-ORCHID vs non-ORCHID
1569                  */
1570                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1571                         ipv6_addr_orchid(dst->addr));
1572                 break;
1573         case IPV6_SADDR_RULE_PREFIX:
1574                 /* Rule 8: Use longest matching prefix */
1575                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1576                 if (ret > score->ifa->prefix_len)
1577                         ret = score->ifa->prefix_len;
1578                 score->matchlen = ret;
1579                 break;
1580 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1581         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1582                 /* Optimistic addresses still have lower precedence than other
1583                  * preferred addresses.
1584                  */
1585                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1586                 break;
1587 #endif
1588         default:
1589                 ret = 0;
1590         }
1591
1592         if (ret)
1593                 __set_bit(i, score->scorebits);
1594         score->rule = i;
1595 out:
1596         return ret;
1597 }
1598
1599 static int __ipv6_dev_get_saddr(struct net *net,
1600                                 struct ipv6_saddr_dst *dst,
1601                                 struct inet6_dev *idev,
1602                                 struct ipv6_saddr_score *scores,
1603                                 int hiscore_idx)
1604 {
1605         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1606
1607         list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1608                 int i;
1609
1610                 /*
1611                  * - Tentative Address (RFC2462 section 5.4)
1612                  *  - A tentative address is not considered
1613                  *    "assigned to an interface" in the traditional
1614                  *    sense, unless it is also flagged as optimistic.
1615                  * - Candidate Source Address (section 4)
1616                  *  - In any case, anycast addresses, multicast
1617                  *    addresses, and the unspecified address MUST
1618                  *    NOT be included in a candidate set.
1619                  */
1620                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1621                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1622                         continue;
1623
1624                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1625
1626                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1627                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1628                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1629                                             idev->dev->name);
1630                         continue;
1631                 }
1632
1633                 score->rule = -1;
1634                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1635
1636                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1637                         int minihiscore, miniscore;
1638
1639                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1640                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1641
1642                         if (minihiscore > miniscore) {
1643                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1644                                     score->scopedist > 0) {
1645                                         /*
1646                                          * special case:
1647                                          * each remaining entry
1648                                          * has too small (not enough)
1649                                          * scope, because ifa entries
1650                                          * are sorted by their scope
1651                                          * values.
1652                                          */
1653                                         goto out;
1654                                 }
1655                                 break;
1656                         } else if (minihiscore < miniscore) {
1657                                 swap(hiscore, score);
1658                                 hiscore_idx = 1 - hiscore_idx;
1659
1660                                 /* restore our iterator */
1661                                 score->ifa = hiscore->ifa;
1662
1663                                 break;
1664                         }
1665                 }
1666         }
1667 out:
1668         return hiscore_idx;
1669 }
1670
1671 static int ipv6_get_saddr_master(struct net *net,
1672                                  const struct net_device *dst_dev,
1673                                  const struct net_device *master,
1674                                  struct ipv6_saddr_dst *dst,
1675                                  struct ipv6_saddr_score *scores,
1676                                  int hiscore_idx)
1677 {
1678         struct inet6_dev *idev;
1679
1680         idev = __in6_dev_get(dst_dev);
1681         if (idev)
1682                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1683                                                    scores, hiscore_idx);
1684
1685         idev = __in6_dev_get(master);
1686         if (idev)
1687                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1688                                                    scores, hiscore_idx);
1689
1690         return hiscore_idx;
1691 }
1692
1693 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1694                        const struct in6_addr *daddr, unsigned int prefs,
1695                        struct in6_addr *saddr)
1696 {
1697         struct ipv6_saddr_score scores[2], *hiscore;
1698         struct ipv6_saddr_dst dst;
1699         struct inet6_dev *idev;
1700         struct net_device *dev;
1701         int dst_type;
1702         bool use_oif_addr = false;
1703         int hiscore_idx = 0;
1704         int ret = 0;
1705
1706         dst_type = __ipv6_addr_type(daddr);
1707         dst.addr = daddr;
1708         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1709         dst.scope = __ipv6_addr_src_scope(dst_type);
1710         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1711         dst.prefs = prefs;
1712
1713         scores[hiscore_idx].rule = -1;
1714         scores[hiscore_idx].ifa = NULL;
1715
1716         rcu_read_lock();
1717
1718         /* Candidate Source Address (section 4)
1719          *  - multicast and link-local destination address,
1720          *    the set of candidate source address MUST only
1721          *    include addresses assigned to interfaces
1722          *    belonging to the same link as the outgoing
1723          *    interface.
1724          * (- For site-local destination addresses, the
1725          *    set of candidate source addresses MUST only
1726          *    include addresses assigned to interfaces
1727          *    belonging to the same site as the outgoing
1728          *    interface.)
1729          *  - "It is RECOMMENDED that the candidate source addresses
1730          *    be the set of unicast addresses assigned to the
1731          *    interface that will be used to send to the destination
1732          *    (the 'outgoing' interface)." (RFC 6724)
1733          */
1734         if (dst_dev) {
1735                 idev = __in6_dev_get(dst_dev);
1736                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1737                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1738                     (idev && idev->cnf.use_oif_addrs_only)) {
1739                         use_oif_addr = true;
1740                 }
1741         }
1742
1743         if (use_oif_addr) {
1744                 if (idev)
1745                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1746         } else {
1747                 const struct net_device *master;
1748                 int master_idx = 0;
1749
1750                 /* if dst_dev exists and is enslaved to an L3 device, then
1751                  * prefer addresses from dst_dev and then the master over
1752                  * any other enslaved devices in the L3 domain.
1753                  */
1754                 master = l3mdev_master_dev_rcu(dst_dev);
1755                 if (master) {
1756                         master_idx = master->ifindex;
1757
1758                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1759                                                             master, &dst,
1760                                                             scores, hiscore_idx);
1761
1762                         if (scores[hiscore_idx].ifa)
1763                                 goto out;
1764                 }
1765
1766                 for_each_netdev_rcu(net, dev) {
1767                         /* only consider addresses on devices in the
1768                          * same L3 domain
1769                          */
1770                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1771                                 continue;
1772                         idev = __in6_dev_get(dev);
1773                         if (!idev)
1774                                 continue;
1775                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1776                 }
1777         }
1778
1779 out:
1780         hiscore = &scores[hiscore_idx];
1781         if (!hiscore->ifa)
1782                 ret = -EADDRNOTAVAIL;
1783         else
1784                 *saddr = hiscore->ifa->addr;
1785
1786         rcu_read_unlock();
1787         return ret;
1788 }
1789 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1790
1791 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1792                       u32 banned_flags)
1793 {
1794         struct inet6_ifaddr *ifp;
1795         int err = -EADDRNOTAVAIL;
1796
1797         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1798                 if (ifp->scope > IFA_LINK)
1799                         break;
1800                 if (ifp->scope == IFA_LINK &&
1801                     !(ifp->flags & banned_flags)) {
1802                         *addr = ifp->addr;
1803                         err = 0;
1804                         break;
1805                 }
1806         }
1807         return err;
1808 }
1809
1810 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1811                     u32 banned_flags)
1812 {
1813         struct inet6_dev *idev;
1814         int err = -EADDRNOTAVAIL;
1815
1816         rcu_read_lock();
1817         idev = __in6_dev_get(dev);
1818         if (idev) {
1819                 read_lock_bh(&idev->lock);
1820                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1821                 read_unlock_bh(&idev->lock);
1822         }
1823         rcu_read_unlock();
1824         return err;
1825 }
1826
1827 static int ipv6_count_addresses(const struct inet6_dev *idev)
1828 {
1829         const struct inet6_ifaddr *ifp;
1830         int cnt = 0;
1831
1832         rcu_read_lock();
1833         list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1834                 cnt++;
1835         rcu_read_unlock();
1836         return cnt;
1837 }
1838
1839 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1840                   const struct net_device *dev, int strict)
1841 {
1842         return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1843                                        strict, IFA_F_TENTATIVE);
1844 }
1845 EXPORT_SYMBOL(ipv6_chk_addr);
1846
1847 /* device argument is used to find the L3 domain of interest. If
1848  * skip_dev_check is set, then the ifp device is not checked against
1849  * the passed in dev argument. So the 2 cases for addresses checks are:
1850  *   1. does the address exist in the L3 domain that dev is part of
1851  *      (skip_dev_check = true), or
1852  *
1853  *   2. does the address exist on the specific device
1854  *      (skip_dev_check = false)
1855  */
1856 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1857                             const struct net_device *dev, bool skip_dev_check,
1858                             int strict, u32 banned_flags)
1859 {
1860         unsigned int hash = inet6_addr_hash(net, addr);
1861         const struct net_device *l3mdev;
1862         struct inet6_ifaddr *ifp;
1863         u32 ifp_flags;
1864
1865         rcu_read_lock();
1866
1867         l3mdev = l3mdev_master_dev_rcu(dev);
1868         if (skip_dev_check)
1869                 dev = NULL;
1870
1871         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1872                 if (!net_eq(dev_net(ifp->idev->dev), net))
1873                         continue;
1874
1875                 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1876                         continue;
1877
1878                 /* Decouple optimistic from tentative for evaluation here.
1879                  * Ban optimistic addresses explicitly, when required.
1880                  */
1881                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1882                             ? (ifp->flags&~IFA_F_TENTATIVE)
1883                             : ifp->flags;
1884                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1885                     !(ifp_flags&banned_flags) &&
1886                     (!dev || ifp->idev->dev == dev ||
1887                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1888                         rcu_read_unlock();
1889                         return 1;
1890                 }
1891         }
1892
1893         rcu_read_unlock();
1894         return 0;
1895 }
1896 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1897
1898
1899 /* Compares an address/prefix_len with addresses on device @dev.
1900  * If one is found it returns true.
1901  */
1902 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1903         const unsigned int prefix_len, struct net_device *dev)
1904 {
1905         const struct inet6_ifaddr *ifa;
1906         const struct inet6_dev *idev;
1907         bool ret = false;
1908
1909         rcu_read_lock();
1910         idev = __in6_dev_get(dev);
1911         if (idev) {
1912                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1913                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1914                         if (ret)
1915                                 break;
1916                 }
1917         }
1918         rcu_read_unlock();
1919
1920         return ret;
1921 }
1922 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1923
1924 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1925 {
1926         const struct inet6_ifaddr *ifa;
1927         const struct inet6_dev *idev;
1928         int     onlink;
1929
1930         onlink = 0;
1931         rcu_read_lock();
1932         idev = __in6_dev_get(dev);
1933         if (idev) {
1934                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1935                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1936                                                    ifa->prefix_len);
1937                         if (onlink)
1938                                 break;
1939                 }
1940         }
1941         rcu_read_unlock();
1942         return onlink;
1943 }
1944 EXPORT_SYMBOL(ipv6_chk_prefix);
1945
1946 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1947                                      struct net_device *dev, int strict)
1948 {
1949         unsigned int hash = inet6_addr_hash(net, addr);
1950         struct inet6_ifaddr *ifp, *result = NULL;
1951
1952         rcu_read_lock();
1953         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1954                 if (!net_eq(dev_net(ifp->idev->dev), net))
1955                         continue;
1956                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1957                         if (!dev || ifp->idev->dev == dev ||
1958                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1959                                 result = ifp;
1960                                 in6_ifa_hold(ifp);
1961                                 break;
1962                         }
1963                 }
1964         }
1965         rcu_read_unlock();
1966
1967         return result;
1968 }
1969
1970 /* Gets referenced address, destroys ifaddr */
1971
1972 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1973 {
1974         if (dad_failed)
1975                 ifp->flags |= IFA_F_DADFAILED;
1976
1977         if (ifp->flags&IFA_F_TEMPORARY) {
1978                 struct inet6_ifaddr *ifpub;
1979                 spin_lock_bh(&ifp->lock);
1980                 ifpub = ifp->ifpub;
1981                 if (ifpub) {
1982                         in6_ifa_hold(ifpub);
1983                         spin_unlock_bh(&ifp->lock);
1984                         ipv6_create_tempaddr(ifpub, ifp, true);
1985                         in6_ifa_put(ifpub);
1986                 } else {
1987                         spin_unlock_bh(&ifp->lock);
1988                 }
1989                 ipv6_del_addr(ifp);
1990         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1991                 spin_lock_bh(&ifp->lock);
1992                 addrconf_del_dad_work(ifp);
1993                 ifp->flags |= IFA_F_TENTATIVE;
1994                 if (dad_failed)
1995                         ifp->flags &= ~IFA_F_OPTIMISTIC;
1996                 spin_unlock_bh(&ifp->lock);
1997                 if (dad_failed)
1998                         ipv6_ifa_notify(0, ifp);
1999                 in6_ifa_put(ifp);
2000         } else {
2001                 ipv6_del_addr(ifp);
2002         }
2003 }
2004
2005 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2006 {
2007         int err = -ENOENT;
2008
2009         spin_lock_bh(&ifp->lock);
2010         if (ifp->state == INET6_IFADDR_STATE_DAD) {
2011                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2012                 err = 0;
2013         }
2014         spin_unlock_bh(&ifp->lock);
2015
2016         return err;
2017 }
2018
2019 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2020 {
2021         struct inet6_dev *idev = ifp->idev;
2022         struct net *net = dev_net(ifp->idev->dev);
2023
2024         if (addrconf_dad_end(ifp)) {
2025                 in6_ifa_put(ifp);
2026                 return;
2027         }
2028
2029         net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2030                              ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2031
2032         spin_lock_bh(&ifp->lock);
2033
2034         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2035                 int scope = ifp->scope;
2036                 u32 flags = ifp->flags;
2037                 struct in6_addr new_addr;
2038                 struct inet6_ifaddr *ifp2;
2039                 u32 valid_lft, preferred_lft;
2040                 int pfxlen = ifp->prefix_len;
2041                 int retries = ifp->stable_privacy_retry + 1;
2042
2043                 if (retries > net->ipv6.sysctl.idgen_retries) {
2044                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2045                                              ifp->idev->dev->name);
2046                         goto errdad;
2047                 }
2048
2049                 new_addr = ifp->addr;
2050                 if (ipv6_generate_stable_address(&new_addr, retries,
2051                                                  idev))
2052                         goto errdad;
2053
2054                 valid_lft = ifp->valid_lft;
2055                 preferred_lft = ifp->prefered_lft;
2056
2057                 spin_unlock_bh(&ifp->lock);
2058
2059                 if (idev->cnf.max_addresses &&
2060                     ipv6_count_addresses(idev) >=
2061                     idev->cnf.max_addresses)
2062                         goto lock_errdad;
2063
2064                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2065                                      ifp->idev->dev->name);
2066
2067                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2068                                      scope, flags, valid_lft,
2069                                      preferred_lft, false, NULL);
2070                 if (IS_ERR(ifp2))
2071                         goto lock_errdad;
2072
2073                 spin_lock_bh(&ifp2->lock);
2074                 ifp2->stable_privacy_retry = retries;
2075                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2076                 spin_unlock_bh(&ifp2->lock);
2077
2078                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2079                 in6_ifa_put(ifp2);
2080 lock_errdad:
2081                 spin_lock_bh(&ifp->lock);
2082         }
2083
2084 errdad:
2085         /* transition from _POSTDAD to _ERRDAD */
2086         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2087         spin_unlock_bh(&ifp->lock);
2088
2089         addrconf_mod_dad_work(ifp, 0);
2090         in6_ifa_put(ifp);
2091 }
2092
2093 /* Join to solicited addr multicast group.
2094  * caller must hold RTNL */
2095 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2096 {
2097         struct in6_addr maddr;
2098
2099         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2100                 return;
2101
2102         addrconf_addr_solict_mult(addr, &maddr);
2103         ipv6_dev_mc_inc(dev, &maddr);
2104 }
2105
2106 /* caller must hold RTNL */
2107 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2108 {
2109         struct in6_addr maddr;
2110
2111         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2112                 return;
2113
2114         addrconf_addr_solict_mult(addr, &maddr);
2115         __ipv6_dev_mc_dec(idev, &maddr);
2116 }
2117
2118 /* caller must hold RTNL */
2119 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2120 {
2121         struct in6_addr addr;
2122
2123         if (ifp->prefix_len >= 127) /* RFC 6164 */
2124                 return;
2125         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2126         if (ipv6_addr_any(&addr))
2127                 return;
2128         __ipv6_dev_ac_inc(ifp->idev, &addr);
2129 }
2130
2131 /* caller must hold RTNL */
2132 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2133 {
2134         struct in6_addr addr;
2135
2136         if (ifp->prefix_len >= 127) /* RFC 6164 */
2137                 return;
2138         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2139         if (ipv6_addr_any(&addr))
2140                 return;
2141         __ipv6_dev_ac_dec(ifp->idev, &addr);
2142 }
2143
2144 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2145 {
2146         switch (dev->addr_len) {
2147         case ETH_ALEN:
2148                 memcpy(eui, dev->dev_addr, 3);
2149                 eui[3] = 0xFF;
2150                 eui[4] = 0xFE;
2151                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2152                 break;
2153         case EUI64_ADDR_LEN:
2154                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2155                 eui[0] ^= 2;
2156                 break;
2157         default:
2158                 return -1;
2159         }
2160
2161         return 0;
2162 }
2163
2164 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2165 {
2166         union fwnet_hwaddr *ha;
2167
2168         if (dev->addr_len != FWNET_ALEN)
2169                 return -1;
2170
2171         ha = (union fwnet_hwaddr *)dev->dev_addr;
2172
2173         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2174         eui[0] ^= 2;
2175         return 0;
2176 }
2177
2178 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2179 {
2180         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2181         if (dev->addr_len != ARCNET_ALEN)
2182                 return -1;
2183         memset(eui, 0, 7);
2184         eui[7] = *(u8 *)dev->dev_addr;
2185         return 0;
2186 }
2187
2188 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2189 {
2190         if (dev->addr_len != INFINIBAND_ALEN)
2191                 return -1;
2192         memcpy(eui, dev->dev_addr + 12, 8);
2193         eui[0] |= 2;
2194         return 0;
2195 }
2196
2197 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2198 {
2199         if (addr == 0)
2200                 return -1;
2201         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2202                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2203                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2204                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2205                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2206                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2207         eui[1] = 0;
2208         eui[2] = 0x5E;
2209         eui[3] = 0xFE;
2210         memcpy(eui + 4, &addr, 4);
2211         return 0;
2212 }
2213
2214 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2215 {
2216         if (dev->priv_flags & IFF_ISATAP)
2217                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2218         return -1;
2219 }
2220
2221 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2222 {
2223         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2224 }
2225
2226 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2227 {
2228         memcpy(eui, dev->perm_addr, 3);
2229         memcpy(eui + 5, dev->perm_addr + 3, 3);
2230         eui[3] = 0xFF;
2231         eui[4] = 0xFE;
2232         eui[0] ^= 2;
2233         return 0;
2234 }
2235
2236 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2237 {
2238         switch (dev->type) {
2239         case ARPHRD_ETHER:
2240         case ARPHRD_FDDI:
2241                 return addrconf_ifid_eui48(eui, dev);
2242         case ARPHRD_ARCNET:
2243                 return addrconf_ifid_arcnet(eui, dev);
2244         case ARPHRD_INFINIBAND:
2245                 return addrconf_ifid_infiniband(eui, dev);
2246         case ARPHRD_SIT:
2247                 return addrconf_ifid_sit(eui, dev);
2248         case ARPHRD_IPGRE:
2249         case ARPHRD_TUNNEL:
2250                 return addrconf_ifid_gre(eui, dev);
2251         case ARPHRD_6LOWPAN:
2252                 return addrconf_ifid_6lowpan(eui, dev);
2253         case ARPHRD_IEEE1394:
2254                 return addrconf_ifid_ieee1394(eui, dev);
2255         case ARPHRD_TUNNEL6:
2256         case ARPHRD_IP6GRE:
2257                 return addrconf_ifid_ip6tnl(eui, dev);
2258         }
2259         return -1;
2260 }
2261
2262 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2263 {
2264         int err = -1;
2265         struct inet6_ifaddr *ifp;
2266
2267         read_lock_bh(&idev->lock);
2268         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2269                 if (ifp->scope > IFA_LINK)
2270                         break;
2271                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2272                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2273                         err = 0;
2274                         break;
2275                 }
2276         }
2277         read_unlock_bh(&idev->lock);
2278         return err;
2279 }
2280
2281 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2282 static void ipv6_regen_rndid(struct inet6_dev *idev)
2283 {
2284 regen:
2285         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2286         idev->rndid[0] &= ~0x02;
2287
2288         /*
2289          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2290          * check if generated address is not inappropriate
2291          *
2292          *  - Reserved subnet anycast (RFC 2526)
2293          *      11111101 11....11 1xxxxxxx
2294          *  - ISATAP (RFC4214) 6.1
2295          *      00-00-5E-FE-xx-xx-xx-xx
2296          *  - value 0
2297          *  - XXX: already assigned to an address on the device
2298          */
2299         if (idev->rndid[0] == 0xfd &&
2300             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2301             (idev->rndid[7]&0x80))
2302                 goto regen;
2303         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2304                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2305                         goto regen;
2306                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2307                         goto regen;
2308         }
2309 }
2310
2311 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2312 {
2313         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2314                 ipv6_regen_rndid(idev);
2315 }
2316
2317 /*
2318  *      Add prefix route.
2319  */
2320
2321 static void
2322 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2323                       unsigned long expires, u32 flags)
2324 {
2325         struct fib6_config cfg = {
2326                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2327                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2328                 .fc_ifindex = dev->ifindex,
2329                 .fc_expires = expires,
2330                 .fc_dst_len = plen,
2331                 .fc_flags = RTF_UP | flags,
2332                 .fc_nlinfo.nl_net = dev_net(dev),
2333                 .fc_protocol = RTPROT_KERNEL,
2334                 .fc_type = RTN_UNICAST,
2335         };
2336
2337         cfg.fc_dst = *pfx;
2338
2339         /* Prevent useless cloning on PtP SIT.
2340            This thing is done here expecting that the whole
2341            class of non-broadcast devices need not cloning.
2342          */
2343 #if IS_ENABLED(CONFIG_IPV6_SIT)
2344         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2345                 cfg.fc_flags |= RTF_NONEXTHOP;
2346 #endif
2347
2348         ip6_route_add(&cfg, NULL);
2349 }
2350
2351
2352 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2353                                                   int plen,
2354                                                   const struct net_device *dev,
2355                                                   u32 flags, u32 noflags)
2356 {
2357         struct fib6_node *fn;
2358         struct rt6_info *rt = NULL;
2359         struct fib6_table *table;
2360         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2361
2362         table = fib6_get_table(dev_net(dev), tb_id);
2363         if (!table)
2364                 return NULL;
2365
2366         rcu_read_lock();
2367         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2368         if (!fn)
2369                 goto out;
2370
2371         for_each_fib6_node_rt_rcu(fn) {
2372                 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
2373                         continue;
2374                 if ((rt->rt6i_flags & flags) != flags)
2375                         continue;
2376                 if ((rt->rt6i_flags & noflags) != 0)
2377                         continue;
2378                 if (!dst_hold_safe(&rt->dst))
2379                         rt = NULL;
2380                 break;
2381         }
2382 out:
2383         rcu_read_unlock();
2384         return rt;
2385 }
2386
2387
2388 /* Create "default" multicast route to the interface */
2389
2390 static void addrconf_add_mroute(struct net_device *dev)
2391 {
2392         struct fib6_config cfg = {
2393                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2394                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2395                 .fc_ifindex = dev->ifindex,
2396                 .fc_dst_len = 8,
2397                 .fc_flags = RTF_UP,
2398                 .fc_type = RTN_UNICAST,
2399                 .fc_nlinfo.nl_net = dev_net(dev),
2400         };
2401
2402         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2403
2404         ip6_route_add(&cfg, NULL);
2405 }
2406
2407 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2408 {
2409         struct inet6_dev *idev;
2410
2411         ASSERT_RTNL();
2412
2413         idev = ipv6_find_idev(dev);
2414         if (!idev)
2415                 return ERR_PTR(-ENOBUFS);
2416
2417         if (idev->cnf.disable_ipv6)
2418                 return ERR_PTR(-EACCES);
2419
2420         /* Add default multicast route */
2421         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2422                 addrconf_add_mroute(dev);
2423
2424         return idev;
2425 }
2426
2427 static void manage_tempaddrs(struct inet6_dev *idev,
2428                              struct inet6_ifaddr *ifp,
2429                              __u32 valid_lft, __u32 prefered_lft,
2430                              bool create, unsigned long now)
2431 {
2432         u32 flags;
2433         struct inet6_ifaddr *ift;
2434
2435         read_lock_bh(&idev->lock);
2436         /* update all temporary addresses in the list */
2437         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2438                 int age, max_valid, max_prefered;
2439
2440                 if (ifp != ift->ifpub)
2441                         continue;
2442
2443                 /* RFC 4941 section 3.3:
2444                  * If a received option will extend the lifetime of a public
2445                  * address, the lifetimes of temporary addresses should
2446                  * be extended, subject to the overall constraint that no
2447                  * temporary addresses should ever remain "valid" or "preferred"
2448                  * for a time longer than (TEMP_VALID_LIFETIME) or
2449                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2450                  */
2451                 age = (now - ift->cstamp) / HZ;
2452                 max_valid = idev->cnf.temp_valid_lft - age;
2453                 if (max_valid < 0)
2454                         max_valid = 0;
2455
2456                 max_prefered = idev->cnf.temp_prefered_lft -
2457                                idev->desync_factor - age;
2458                 if (max_prefered < 0)
2459                         max_prefered = 0;
2460
2461                 if (valid_lft > max_valid)
2462                         valid_lft = max_valid;
2463
2464                 if (prefered_lft > max_prefered)
2465                         prefered_lft = max_prefered;
2466
2467                 spin_lock(&ift->lock);
2468                 flags = ift->flags;
2469                 ift->valid_lft = valid_lft;
2470                 ift->prefered_lft = prefered_lft;
2471                 ift->tstamp = now;
2472                 if (prefered_lft > 0)
2473                         ift->flags &= ~IFA_F_DEPRECATED;
2474
2475                 spin_unlock(&ift->lock);
2476                 if (!(flags&IFA_F_TENTATIVE))
2477                         ipv6_ifa_notify(0, ift);
2478         }
2479
2480         if ((create || list_empty(&idev->tempaddr_list)) &&
2481             idev->cnf.use_tempaddr > 0) {
2482                 /* When a new public address is created as described
2483                  * in [ADDRCONF], also create a new temporary address.
2484                  * Also create a temporary address if it's enabled but
2485                  * no temporary address currently exists.
2486                  */
2487                 read_unlock_bh(&idev->lock);
2488                 ipv6_create_tempaddr(ifp, NULL, false);
2489         } else {
2490                 read_unlock_bh(&idev->lock);
2491         }
2492 }
2493
2494 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2495 {
2496         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2497                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2498 }
2499
2500 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2501                                  const struct prefix_info *pinfo,
2502                                  struct inet6_dev *in6_dev,
2503                                  const struct in6_addr *addr, int addr_type,
2504                                  u32 addr_flags, bool sllao, bool tokenized,
2505                                  __u32 valid_lft, u32 prefered_lft)
2506 {
2507         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2508         int create = 0, update_lft = 0;
2509
2510         if (!ifp && valid_lft) {
2511                 int max_addresses = in6_dev->cnf.max_addresses;
2512
2513 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2514                 if ((net->ipv6.devconf_all->optimistic_dad ||
2515                      in6_dev->cnf.optimistic_dad) &&
2516                     !net->ipv6.devconf_all->forwarding && sllao)
2517                         addr_flags |= IFA_F_OPTIMISTIC;
2518 #endif
2519
2520                 /* Do not allow to create too much of autoconfigured
2521                  * addresses; this would be too easy way to crash kernel.
2522                  */
2523                 if (!max_addresses ||
2524                     ipv6_count_addresses(in6_dev) < max_addresses)
2525                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2526                                             pinfo->prefix_len,
2527                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2528                                             addr_flags, valid_lft,
2529                                             prefered_lft, false, NULL);
2530
2531                 if (IS_ERR_OR_NULL(ifp))
2532                         return -1;
2533
2534                 create = 1;
2535                 spin_lock_bh(&ifp->lock);
2536                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2537                 ifp->cstamp = jiffies;
2538                 ifp->tokenized = tokenized;
2539                 spin_unlock_bh(&ifp->lock);
2540                 addrconf_dad_start(ifp);
2541         }
2542
2543         if (ifp) {
2544                 u32 flags;
2545                 unsigned long now;
2546                 u32 stored_lft;
2547
2548                 /* update lifetime (RFC2462 5.5.3 e) */
2549                 spin_lock_bh(&ifp->lock);
2550                 now = jiffies;
2551                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2552                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2553                 else
2554                         stored_lft = 0;
2555                 if (!create && stored_lft) {
2556                         const u32 minimum_lft = min_t(u32,
2557                                 stored_lft, MIN_VALID_LIFETIME);
2558                         valid_lft = max(valid_lft, minimum_lft);
2559
2560                         /* RFC4862 Section 5.5.3e:
2561                          * "Note that the preferred lifetime of the
2562                          *  corresponding address is always reset to
2563                          *  the Preferred Lifetime in the received
2564                          *  Prefix Information option, regardless of
2565                          *  whether the valid lifetime is also reset or
2566                          *  ignored."
2567                          *
2568                          * So we should always update prefered_lft here.
2569                          */
2570                         update_lft = 1;
2571                 }
2572
2573                 if (update_lft) {
2574                         ifp->valid_lft = valid_lft;
2575                         ifp->prefered_lft = prefered_lft;
2576                         ifp->tstamp = now;
2577                         flags = ifp->flags;
2578                         ifp->flags &= ~IFA_F_DEPRECATED;
2579                         spin_unlock_bh(&ifp->lock);
2580
2581                         if (!(flags&IFA_F_TENTATIVE))
2582                                 ipv6_ifa_notify(0, ifp);
2583                 } else
2584                         spin_unlock_bh(&ifp->lock);
2585
2586                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2587                                  create, now);
2588
2589                 in6_ifa_put(ifp);
2590                 addrconf_verify();
2591         }
2592
2593         return 0;
2594 }
2595 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2596
2597 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2598 {
2599         struct prefix_info *pinfo;
2600         __u32 valid_lft;
2601         __u32 prefered_lft;
2602         int addr_type, err;
2603         u32 addr_flags = 0;
2604         struct inet6_dev *in6_dev;
2605         struct net *net = dev_net(dev);
2606
2607         pinfo = (struct prefix_info *) opt;
2608
2609         if (len < sizeof(struct prefix_info)) {
2610                 netdev_dbg(dev, "addrconf: prefix option too short\n");
2611                 return;
2612         }
2613
2614         /*
2615          *      Validation checks ([ADDRCONF], page 19)
2616          */
2617
2618         addr_type = ipv6_addr_type(&pinfo->prefix);
2619
2620         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2621                 return;
2622
2623         valid_lft = ntohl(pinfo->valid);
2624         prefered_lft = ntohl(pinfo->prefered);
2625
2626         if (prefered_lft > valid_lft) {
2627                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2628                 return;
2629         }
2630
2631         in6_dev = in6_dev_get(dev);
2632
2633         if (!in6_dev) {
2634                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2635                                     dev->name);
2636                 return;
2637         }
2638
2639         /*
2640          *      Two things going on here:
2641          *      1) Add routes for on-link prefixes
2642          *      2) Configure prefixes with the auto flag set
2643          */
2644
2645         if (pinfo->onlink) {
2646                 struct rt6_info *rt;
2647                 unsigned long rt_expires;
2648
2649                 /* Avoid arithmetic overflow. Really, we could
2650                  * save rt_expires in seconds, likely valid_lft,
2651                  * but it would require division in fib gc, that it
2652                  * not good.
2653                  */
2654                 if (HZ > USER_HZ)
2655                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2656                 else
2657                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2658
2659                 if (addrconf_finite_timeout(rt_expires))
2660                         rt_expires *= HZ;
2661
2662                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2663                                                pinfo->prefix_len,
2664                                                dev,
2665                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2666                                                RTF_GATEWAY | RTF_DEFAULT);
2667
2668                 if (rt) {
2669                         /* Autoconf prefix route */
2670                         if (valid_lft == 0) {
2671                                 ip6_del_rt(net, rt);
2672                                 rt = NULL;
2673                         } else if (addrconf_finite_timeout(rt_expires)) {
2674                                 /* not infinity */
2675                                 fib6_set_expires(rt, jiffies + rt_expires);
2676                         } else {
2677                                 fib6_clean_expires(rt);
2678                         }
2679                 } else if (valid_lft) {
2680                         clock_t expires = 0;
2681                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2682                         if (addrconf_finite_timeout(rt_expires)) {
2683                                 /* not infinity */
2684                                 flags |= RTF_EXPIRES;
2685                                 expires = jiffies_to_clock_t(rt_expires);
2686                         }
2687                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2688                                               dev, expires, flags);
2689                 }
2690                 ip6_rt_put(rt);
2691         }
2692
2693         /* Try to figure out our local address for this prefix */
2694
2695         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2696                 struct in6_addr addr;
2697                 bool tokenized = false, dev_addr_generated = false;
2698
2699                 if (pinfo->prefix_len == 64) {
2700                         memcpy(&addr, &pinfo->prefix, 8);
2701
2702                         if (!ipv6_addr_any(&in6_dev->token)) {
2703                                 read_lock_bh(&in6_dev->lock);
2704                                 memcpy(addr.s6_addr + 8,
2705                                        in6_dev->token.s6_addr + 8, 8);
2706                                 read_unlock_bh(&in6_dev->lock);
2707                                 tokenized = true;
2708                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2709                                    !ipv6_generate_stable_address(&addr, 0,
2710                                                                  in6_dev)) {
2711                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2712                                 goto ok;
2713                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2714                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2715                                 goto put;
2716                         } else {
2717                                 dev_addr_generated = true;
2718                         }
2719                         goto ok;
2720                 }
2721                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2722                                     pinfo->prefix_len);
2723                 goto put;
2724
2725 ok:
2726                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2727                                                    &addr, addr_type,
2728                                                    addr_flags, sllao,
2729                                                    tokenized, valid_lft,
2730                                                    prefered_lft);
2731                 if (err)
2732                         goto put;
2733
2734                 /* Ignore error case here because previous prefix add addr was
2735                  * successful which will be notified.
2736                  */
2737                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2738                                               addr_type, addr_flags, sllao,
2739                                               tokenized, valid_lft,
2740                                               prefered_lft,
2741                                               dev_addr_generated);
2742         }
2743         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2744 put:
2745         in6_dev_put(in6_dev);
2746 }
2747
2748 /*
2749  *      Set destination address.
2750  *      Special case for SIT interfaces where we create a new "virtual"
2751  *      device.
2752  */
2753 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2754 {
2755         struct in6_ifreq ireq;
2756         struct net_device *dev;
2757         int err = -EINVAL;
2758
2759         rtnl_lock();
2760
2761         err = -EFAULT;
2762         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2763                 goto err_exit;
2764
2765         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2766
2767         err = -ENODEV;
2768         if (!dev)
2769                 goto err_exit;
2770
2771 #if IS_ENABLED(CONFIG_IPV6_SIT)
2772         if (dev->type == ARPHRD_SIT) {
2773                 const struct net_device_ops *ops = dev->netdev_ops;
2774                 struct ifreq ifr;
2775                 struct ip_tunnel_parm p;
2776
2777                 err = -EADDRNOTAVAIL;
2778                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2779                         goto err_exit;
2780
2781                 memset(&p, 0, sizeof(p));
2782                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2783                 p.iph.saddr = 0;
2784                 p.iph.version = 4;
2785                 p.iph.ihl = 5;
2786                 p.iph.protocol = IPPROTO_IPV6;
2787                 p.iph.ttl = 64;
2788                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2789
2790                 if (ops->ndo_do_ioctl) {
2791                         mm_segment_t oldfs = get_fs();
2792
2793                         set_fs(KERNEL_DS);
2794                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2795                         set_fs(oldfs);
2796                 } else
2797                         err = -EOPNOTSUPP;
2798
2799                 if (err == 0) {
2800                         err = -ENOBUFS;
2801                         dev = __dev_get_by_name(net, p.name);
2802                         if (!dev)
2803                                 goto err_exit;
2804                         err = dev_open(dev);
2805                 }
2806         }
2807 #endif
2808
2809 err_exit:
2810         rtnl_unlock();
2811         return err;
2812 }
2813
2814 static int ipv6_mc_config(struct sock *sk, bool join,
2815                           const struct in6_addr *addr, int ifindex)
2816 {
2817         int ret;
2818
2819         ASSERT_RTNL();
2820
2821         lock_sock(sk);
2822         if (join)
2823                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2824         else
2825                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2826         release_sock(sk);
2827
2828         return ret;
2829 }
2830
2831 /*
2832  *      Manual configuration of address on an interface
2833  */
2834 static int inet6_addr_add(struct net *net, int ifindex,
2835                           const struct in6_addr *pfx,
2836                           const struct in6_addr *peer_pfx,
2837                           unsigned int plen, __u32 ifa_flags,
2838                           __u32 prefered_lft, __u32 valid_lft,
2839                           struct netlink_ext_ack *extack)
2840 {
2841         struct inet6_ifaddr *ifp;
2842         struct inet6_dev *idev;
2843         struct net_device *dev;
2844         unsigned long timeout;
2845         clock_t expires;
2846         int scope;
2847         u32 flags;
2848
2849         ASSERT_RTNL();
2850
2851         if (plen > 128)
2852                 return -EINVAL;
2853
2854         /* check the lifetime */
2855         if (!valid_lft || prefered_lft > valid_lft)
2856                 return -EINVAL;
2857
2858         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2859                 return -EINVAL;
2860
2861         dev = __dev_get_by_index(net, ifindex);
2862         if (!dev)
2863                 return -ENODEV;
2864
2865         idev = addrconf_add_dev(dev);
2866         if (IS_ERR(idev))
2867                 return PTR_ERR(idev);
2868
2869         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2870                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2871                                          true, pfx, ifindex);
2872
2873                 if (ret < 0)
2874                         return ret;
2875         }
2876
2877         scope = ipv6_addr_scope(pfx);
2878
2879         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2880         if (addrconf_finite_timeout(timeout)) {
2881                 expires = jiffies_to_clock_t(timeout * HZ);
2882                 valid_lft = timeout;
2883                 flags = RTF_EXPIRES;
2884         } else {
2885                 expires = 0;
2886                 flags = 0;
2887                 ifa_flags |= IFA_F_PERMANENT;
2888         }
2889
2890         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2891         if (addrconf_finite_timeout(timeout)) {
2892                 if (timeout == 0)
2893                         ifa_flags |= IFA_F_DEPRECATED;
2894                 prefered_lft = timeout;
2895         }
2896
2897         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2898                             valid_lft, prefered_lft, true, extack);
2899
2900         if (!IS_ERR(ifp)) {
2901                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2902                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2903                                               expires, flags);
2904                 }
2905
2906                 /* Send a netlink notification if DAD is enabled and
2907                  * optimistic flag is not set
2908                  */
2909                 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2910                         ipv6_ifa_notify(0, ifp);
2911                 /*
2912                  * Note that section 3.1 of RFC 4429 indicates
2913                  * that the Optimistic flag should not be set for
2914                  * manually configured addresses
2915                  */
2916                 addrconf_dad_start(ifp);
2917                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2918                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2919                                          true, jiffies);
2920                 in6_ifa_put(ifp);
2921                 addrconf_verify_rtnl();
2922                 return 0;
2923         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2924                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2925                                false, pfx, ifindex);
2926         }
2927
2928         return PTR_ERR(ifp);
2929 }
2930
2931 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2932                           const struct in6_addr *pfx, unsigned int plen)
2933 {
2934         struct inet6_ifaddr *ifp;
2935         struct inet6_dev *idev;
2936         struct net_device *dev;
2937
2938         if (plen > 128)
2939                 return -EINVAL;
2940
2941         dev = __dev_get_by_index(net, ifindex);
2942         if (!dev)
2943                 return -ENODEV;
2944
2945         idev = __in6_dev_get(dev);
2946         if (!idev)
2947                 return -ENXIO;
2948
2949         read_lock_bh(&idev->lock);
2950         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2951                 if (ifp->prefix_len == plen &&
2952                     ipv6_addr_equal(pfx, &ifp->addr)) {
2953                         in6_ifa_hold(ifp);
2954                         read_unlock_bh(&idev->lock);
2955
2956                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2957                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2958                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2959                                                  jiffies);
2960                         ipv6_del_addr(ifp);
2961                         addrconf_verify_rtnl();
2962                         if (ipv6_addr_is_multicast(pfx)) {
2963                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2964                                                false, pfx, dev->ifindex);
2965                         }
2966                         return 0;
2967                 }
2968         }
2969         read_unlock_bh(&idev->lock);
2970         return -EADDRNOTAVAIL;
2971 }
2972
2973
2974 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2975 {
2976         struct in6_ifreq ireq;
2977         int err;
2978
2979         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2980                 return -EPERM;
2981
2982         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2983                 return -EFAULT;
2984
2985         rtnl_lock();
2986         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2987                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2988                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL);
2989         rtnl_unlock();
2990         return err;
2991 }
2992
2993 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2994 {
2995         struct in6_ifreq ireq;
2996         int err;
2997
2998         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2999                 return -EPERM;
3000
3001         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3002                 return -EFAULT;
3003
3004         rtnl_lock();
3005         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3006                              ireq.ifr6_prefixlen);
3007         rtnl_unlock();
3008         return err;
3009 }
3010
3011 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3012                      int plen, int scope)
3013 {
3014         struct inet6_ifaddr *ifp;
3015
3016         ifp = ipv6_add_addr(idev, addr, NULL, plen,
3017                             scope, IFA_F_PERMANENT,
3018                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
3019                             true, NULL);
3020         if (!IS_ERR(ifp)) {
3021                 spin_lock_bh(&ifp->lock);
3022                 ifp->flags &= ~IFA_F_TENTATIVE;
3023                 spin_unlock_bh(&ifp->lock);
3024                 rt_genid_bump_ipv6(dev_net(idev->dev));
3025                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3026                 in6_ifa_put(ifp);
3027         }
3028 }
3029
3030 #if IS_ENABLED(CONFIG_IPV6_SIT)
3031 static void sit_add_v4_addrs(struct inet6_dev *idev)
3032 {
3033         struct in6_addr addr;
3034         struct net_device *dev;
3035         struct net *net = dev_net(idev->dev);
3036         int scope, plen;
3037         u32 pflags = 0;
3038
3039         ASSERT_RTNL();
3040
3041         memset(&addr, 0, sizeof(struct in6_addr));
3042         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3043
3044         if (idev->dev->flags&IFF_POINTOPOINT) {
3045                 addr.s6_addr32[0] = htonl(0xfe800000);
3046                 scope = IFA_LINK;
3047                 plen = 64;
3048         } else {
3049                 scope = IPV6_ADDR_COMPATv4;
3050                 plen = 96;
3051                 pflags |= RTF_NONEXTHOP;
3052         }
3053
3054         if (addr.s6_addr32[3]) {
3055                 add_addr(idev, &addr, plen, scope);
3056                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
3057                 return;
3058         }
3059
3060         for_each_netdev(net, dev) {
3061                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3062                 if (in_dev && (dev->flags & IFF_UP)) {
3063                         struct in_ifaddr *ifa;
3064
3065                         int flag = scope;
3066
3067                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3068
3069                                 addr.s6_addr32[3] = ifa->ifa_local;
3070
3071                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3072                                         continue;
3073                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3074                                         if (idev->dev->flags&IFF_POINTOPOINT)
3075                                                 continue;
3076                                         flag |= IFA_HOST;
3077                                 }
3078
3079                                 add_addr(idev, &addr, plen, flag);
3080                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3081                                                       pflags);
3082                         }
3083                 }
3084         }
3085 }
3086 #endif
3087
3088 static void init_loopback(struct net_device *dev)
3089 {
3090         struct inet6_dev  *idev;
3091
3092         /* ::1 */
3093
3094         ASSERT_RTNL();
3095
3096         idev = ipv6_find_idev(dev);
3097         if (!idev) {
3098                 pr_debug("%s: add_dev failed\n", __func__);
3099                 return;
3100         }
3101
3102         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3103 }
3104
3105 void addrconf_add_linklocal(struct inet6_dev *idev,
3106                             const struct in6_addr *addr, u32 flags)
3107 {
3108         struct inet6_ifaddr *ifp;
3109         u32 addr_flags = flags | IFA_F_PERMANENT;
3110
3111 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3112         if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3113              idev->cnf.optimistic_dad) &&
3114             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3115                 addr_flags |= IFA_F_OPTIMISTIC;
3116 #endif
3117
3118         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3119                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
3120         if (!IS_ERR(ifp)) {
3121                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3122                 addrconf_dad_start(ifp);
3123                 in6_ifa_put(ifp);
3124         }
3125 }
3126 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3127
3128 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3129 {
3130         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3131                 return true;
3132
3133         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3134             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3135                 return true;
3136
3137         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3138             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3139                 return true;
3140
3141         return false;
3142 }
3143
3144 static int ipv6_generate_stable_address(struct in6_addr *address,
3145                                         u8 dad_count,
3146                                         const struct inet6_dev *idev)
3147 {
3148         static DEFINE_SPINLOCK(lock);
3149         static __u32 digest[SHA_DIGEST_WORDS];
3150         static __u32 workspace[SHA_WORKSPACE_WORDS];
3151
3152         static union {
3153                 char __data[SHA_MESSAGE_BYTES];
3154                 struct {
3155                         struct in6_addr secret;
3156                         __be32 prefix[2];
3157                         unsigned char hwaddr[MAX_ADDR_LEN];
3158                         u8 dad_count;
3159                 } __packed;
3160         } data;
3161
3162         struct in6_addr secret;
3163         struct in6_addr temp;
3164         struct net *net = dev_net(idev->dev);
3165
3166         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3167
3168         if (idev->cnf.stable_secret.initialized)
3169                 secret = idev->cnf.stable_secret.secret;
3170         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3171                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3172         else
3173                 return -1;
3174
3175 retry:
3176         spin_lock_bh(&lock);
3177
3178         sha_init(digest);
3179         memset(&data, 0, sizeof(data));
3180         memset(workspace, 0, sizeof(workspace));
3181         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3182         data.prefix[0] = address->s6_addr32[0];
3183         data.prefix[1] = address->s6_addr32[1];
3184         data.secret = secret;
3185         data.dad_count = dad_count;
3186
3187         sha_transform(digest, data.__data, workspace);
3188
3189         temp = *address;
3190         temp.s6_addr32[2] = (__force __be32)digest[0];
3191         temp.s6_addr32[3] = (__force __be32)digest[1];
3192
3193         spin_unlock_bh(&lock);
3194
3195         if (ipv6_reserved_interfaceid(temp)) {
3196                 dad_count++;
3197                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3198                         return -1;
3199                 goto retry;
3200         }
3201
3202         *address = temp;
3203         return 0;
3204 }
3205
3206 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3207 {
3208         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3209
3210         if (s->initialized)
3211                 return;
3212         s = &idev->cnf.stable_secret;
3213         get_random_bytes(&s->secret, sizeof(s->secret));
3214         s->initialized = true;
3215 }
3216
3217 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3218 {
3219         struct in6_addr addr;
3220
3221         /* no link local addresses on L3 master devices */
3222         if (netif_is_l3_master(idev->dev))
3223                 return;
3224
3225         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3226
3227         switch (idev->cnf.addr_gen_mode) {
3228         case IN6_ADDR_GEN_MODE_RANDOM:
3229                 ipv6_gen_mode_random_init(idev);
3230                 /* fallthrough */
3231         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3232                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3233                         addrconf_add_linklocal(idev, &addr,
3234                                                IFA_F_STABLE_PRIVACY);
3235                 else if (prefix_route)
3236                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3237                 break;
3238         case IN6_ADDR_GEN_MODE_EUI64:
3239                 /* addrconf_add_linklocal also adds a prefix_route and we
3240                  * only need to care about prefix routes if ipv6_generate_eui64
3241                  * couldn't generate one.
3242                  */
3243                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3244                         addrconf_add_linklocal(idev, &addr, 0);
3245                 else if (prefix_route)
3246                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3247                 break;
3248         case IN6_ADDR_GEN_MODE_NONE:
3249         default:
3250                 /* will not add any link local address */
3251                 break;
3252         }
3253 }
3254
3255 static void addrconf_dev_config(struct net_device *dev)
3256 {
3257         struct inet6_dev *idev;
3258
3259         ASSERT_RTNL();
3260
3261         if ((dev->type != ARPHRD_ETHER) &&
3262             (dev->type != ARPHRD_FDDI) &&
3263             (dev->type != ARPHRD_ARCNET) &&
3264             (dev->type != ARPHRD_INFINIBAND) &&
3265             (dev->type != ARPHRD_IEEE1394) &&
3266             (dev->type != ARPHRD_TUNNEL6) &&
3267             (dev->type != ARPHRD_6LOWPAN) &&
3268             (dev->type != ARPHRD_IP6GRE) &&
3269             (dev->type != ARPHRD_IPGRE) &&
3270             (dev->type != ARPHRD_TUNNEL) &&
3271             (dev->type != ARPHRD_NONE)) {
3272                 /* Alas, we support only Ethernet autoconfiguration. */
3273                 return;
3274         }
3275
3276         idev = addrconf_add_dev(dev);
3277         if (IS_ERR(idev))
3278                 return;
3279
3280         /* this device type has no EUI support */
3281         if (dev->type == ARPHRD_NONE &&
3282             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3283                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3284
3285         addrconf_addr_gen(idev, false);
3286 }
3287
3288 #if IS_ENABLED(CONFIG_IPV6_SIT)
3289 static void addrconf_sit_config(struct net_device *dev)
3290 {
3291         struct inet6_dev *idev;
3292
3293         ASSERT_RTNL();
3294
3295         /*
3296          * Configure the tunnel with one of our IPv4
3297          * addresses... we should configure all of
3298          * our v4 addrs in the tunnel
3299          */
3300
3301         idev = ipv6_find_idev(dev);
3302         if (!idev) {
3303                 pr_debug("%s: add_dev failed\n", __func__);
3304                 return;
3305         }
3306
3307         if (dev->priv_flags & IFF_ISATAP) {
3308                 addrconf_addr_gen(idev, false);
3309                 return;
3310         }
3311
3312         sit_add_v4_addrs(idev);
3313
3314         if (dev->flags&IFF_POINTOPOINT)
3315                 addrconf_add_mroute(dev);
3316 }
3317 #endif
3318
3319 #if IS_ENABLED(CONFIG_NET_IPGRE)
3320 static void addrconf_gre_config(struct net_device *dev)
3321 {
3322         struct inet6_dev *idev;
3323
3324         ASSERT_RTNL();
3325
3326         idev = ipv6_find_idev(dev);
3327         if (!idev) {
3328                 pr_debug("%s: add_dev failed\n", __func__);
3329                 return;
3330         }
3331
3332         addrconf_addr_gen(idev, true);
3333         if (dev->flags & IFF_POINTOPOINT)
3334                 addrconf_add_mroute(dev);
3335 }
3336 #endif
3337
3338 static int fixup_permanent_addr(struct net *net,
3339                                 struct inet6_dev *idev,
3340                                 struct inet6_ifaddr *ifp)
3341 {
3342         /* !rt6i_node means the host route was removed from the
3343          * FIB, for example, if 'lo' device is taken down. In that
3344          * case regenerate the host route.
3345          */
3346         if (!ifp->rt || !ifp->rt->rt6i_node) {
3347                 struct rt6_info *rt, *prev;
3348
3349                 rt = addrconf_dst_alloc(net, idev, &ifp->addr, false);
3350                 if (IS_ERR(rt))
3351                         return PTR_ERR(rt);
3352
3353                 /* ifp->rt can be accessed outside of rtnl */
3354                 spin_lock(&ifp->lock);
3355                 prev = ifp->rt;
3356                 ifp->rt = rt;
3357                 spin_unlock(&ifp->lock);
3358
3359                 ip6_rt_put(prev);
3360         }
3361
3362         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3363                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3364                                       idev->dev, 0, 0);
3365         }
3366
3367         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3368                 addrconf_dad_start(ifp);
3369
3370         return 0;
3371 }
3372
3373 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3374 {
3375         struct inet6_ifaddr *ifp, *tmp;
3376         struct inet6_dev *idev;
3377
3378         idev = __in6_dev_get(dev);
3379         if (!idev)
3380                 return;
3381
3382         write_lock_bh(&idev->lock);
3383
3384         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3385                 if ((ifp->flags & IFA_F_PERMANENT) &&
3386                     fixup_permanent_addr(net, idev, ifp) < 0) {
3387                         write_unlock_bh(&idev->lock);
3388                         in6_ifa_hold(ifp);
3389                         ipv6_del_addr(ifp);
3390                         write_lock_bh(&idev->lock);
3391
3392                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3393                                              idev->dev->name, &ifp->addr);
3394                 }
3395         }
3396
3397         write_unlock_bh(&idev->lock);
3398 }
3399
3400 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3401                            void *ptr)
3402 {
3403         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3404         struct netdev_notifier_changeupper_info *info;
3405         struct inet6_dev *idev = __in6_dev_get(dev);
3406         struct net *net = dev_net(dev);
3407         int run_pending = 0;
3408         int err;
3409
3410         switch (event) {
3411         case NETDEV_REGISTER:
3412                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3413                         idev = ipv6_add_dev(dev);
3414                         if (IS_ERR(idev))
3415                                 return notifier_from_errno(PTR_ERR(idev));
3416                 }
3417                 break;
3418
3419         case NETDEV_CHANGEMTU:
3420                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3421                 if (dev->mtu < IPV6_MIN_MTU) {
3422                         addrconf_ifdown(dev, dev != net->loopback_dev);
3423                         break;
3424                 }
3425
3426                 if (idev) {
3427                         rt6_mtu_change(dev, dev->mtu);
3428                         idev->cnf.mtu6 = dev->mtu;
3429                         break;
3430                 }
3431
3432                 /* allocate new idev */
3433                 idev = ipv6_add_dev(dev);
3434                 if (IS_ERR(idev))
3435                         break;
3436
3437                 /* device is still not ready */
3438                 if (!(idev->if_flags & IF_READY))
3439                         break;
3440
3441                 run_pending = 1;
3442
3443                 /* fall through */
3444
3445         case NETDEV_UP:
3446         case NETDEV_CHANGE:
3447                 if (dev->flags & IFF_SLAVE)
3448                         break;
3449
3450                 if (idev && idev->cnf.disable_ipv6)
3451                         break;
3452
3453                 if (event == NETDEV_UP) {
3454                         /* restore routes for permanent addresses */
3455                         addrconf_permanent_addr(net, dev);
3456
3457                         if (!addrconf_link_ready(dev)) {
3458                                 /* device is not ready yet. */
3459                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3460                                         dev->name);
3461                                 break;
3462                         }
3463
3464                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3465                                 idev = ipv6_add_dev(dev);
3466
3467                         if (!IS_ERR_OR_NULL(idev)) {
3468                                 idev->if_flags |= IF_READY;
3469                                 run_pending = 1;
3470                         }
3471                 } else if (event == NETDEV_CHANGE) {
3472                         if (!addrconf_link_ready(dev)) {
3473                                 /* device is still not ready. */
3474                                 rt6_sync_down_dev(dev, event);
3475                                 break;
3476                         }
3477
3478                         if (idev) {
3479                                 if (idev->if_flags & IF_READY) {
3480                                         /* device is already configured -
3481                                          * but resend MLD reports, we might
3482                                          * have roamed and need to update
3483                                          * multicast snooping switches
3484                                          */
3485                                         ipv6_mc_up(idev);
3486                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
3487                                         break;
3488                                 }
3489                                 idev->if_flags |= IF_READY;
3490                         }
3491
3492                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3493                                 dev->name);
3494
3495                         run_pending = 1;
3496                 }
3497
3498                 switch (dev->type) {
3499 #if IS_ENABLED(CONFIG_IPV6_SIT)
3500                 case ARPHRD_SIT:
3501                         addrconf_sit_config(dev);
3502                         break;
3503 #endif
3504 #if IS_ENABLED(CONFIG_NET_IPGRE)
3505                 case ARPHRD_IPGRE:
3506                         addrconf_gre_config(dev);
3507                         break;
3508 #endif
3509                 case ARPHRD_LOOPBACK:
3510                         init_loopback(dev);
3511                         break;
3512
3513                 default:
3514                         addrconf_dev_config(dev);
3515                         break;
3516                 }
3517
3518                 if (!IS_ERR_OR_NULL(idev)) {
3519                         if (run_pending)
3520                                 addrconf_dad_run(idev);
3521
3522                         /* Device has an address by now */
3523                         rt6_sync_up(dev, RTNH_F_DEAD);
3524
3525                         /*
3526                          * If the MTU changed during the interface down,
3527                          * when the interface up, the changed MTU must be
3528                          * reflected in the idev as well as routers.
3529                          */
3530                         if (idev->cnf.mtu6 != dev->mtu &&
3531                             dev->mtu >= IPV6_MIN_MTU) {
3532                                 rt6_mtu_change(dev, dev->mtu);
3533                                 idev->cnf.mtu6 = dev->mtu;
3534                         }
3535                         idev->tstamp = jiffies;
3536                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3537
3538                         /*
3539                          * If the changed mtu during down is lower than
3540                          * IPV6_MIN_MTU stop IPv6 on this interface.
3541                          */
3542                         if (dev->mtu < IPV6_MIN_MTU)
3543                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3544                 }
3545                 break;
3546
3547         case NETDEV_DOWN:
3548         case NETDEV_UNREGISTER:
3549                 /*
3550                  *      Remove all addresses from this interface.
3551                  */
3552                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3553                 break;
3554
3555         case NETDEV_CHANGENAME:
3556                 if (idev) {
3557                         snmp6_unregister_dev(idev);
3558                         addrconf_sysctl_unregister(idev);
3559                         err = addrconf_sysctl_register(idev);
3560                         if (err)
3561                                 return notifier_from_errno(err);
3562                         err = snmp6_register_dev(idev);
3563                         if (err) {
3564                                 addrconf_sysctl_unregister(idev);
3565                                 return notifier_from_errno(err);
3566                         }
3567                 }
3568                 break;
3569
3570         case NETDEV_PRE_TYPE_CHANGE:
3571         case NETDEV_POST_TYPE_CHANGE:
3572                 if (idev)
3573                         addrconf_type_change(dev, event);
3574                 break;
3575
3576         case NETDEV_CHANGEUPPER:
3577                 info = ptr;
3578
3579                 /* flush all routes if dev is linked to or unlinked from
3580                  * an L3 master device (e.g., VRF)
3581                  */
3582                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3583                         addrconf_ifdown(dev, 0);
3584         }
3585
3586         return NOTIFY_OK;
3587 }
3588
3589 /*
3590  *      addrconf module should be notified of a device going up
3591  */
3592 static struct notifier_block ipv6_dev_notf = {
3593         .notifier_call = addrconf_notify,
3594         .priority = ADDRCONF_NOTIFY_PRIORITY,
3595 };
3596
3597 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3598 {
3599         struct inet6_dev *idev;
3600         ASSERT_RTNL();
3601
3602         idev = __in6_dev_get(dev);
3603
3604         if (event == NETDEV_POST_TYPE_CHANGE)
3605                 ipv6_mc_remap(idev);
3606         else if (event == NETDEV_PRE_TYPE_CHANGE)
3607                 ipv6_mc_unmap(idev);
3608 }
3609
3610 static bool addr_is_local(const struct in6_addr *addr)
3611 {
3612         return ipv6_addr_type(addr) &
3613                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3614 }
3615
3616 static int addrconf_ifdown(struct net_device *dev, int how)
3617 {
3618         unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3619         struct net *net = dev_net(dev);
3620         struct inet6_dev *idev;
3621         struct inet6_ifaddr *ifa, *tmp;
3622         int _keep_addr;
3623         bool keep_addr;
3624         int state, i;
3625
3626         ASSERT_RTNL();
3627
3628         rt6_disable_ip(dev, event);
3629
3630         idev = __in6_dev_get(dev);
3631         if (!idev)
3632                 return -ENODEV;
3633
3634         /*
3635          * Step 1: remove reference to ipv6 device from parent device.
3636          *         Do not dev_put!
3637          */
3638         if (how) {
3639                 idev->dead = 1;
3640
3641                 /* protected by rtnl_lock */
3642                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3643
3644                 /* Step 1.5: remove snmp6 entry */
3645                 snmp6_unregister_dev(idev);
3646
3647         }
3648
3649         /* aggregate the system setting and interface setting */
3650         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3651         if (!_keep_addr)
3652                 _keep_addr = idev->cnf.keep_addr_on_down;
3653
3654         /* combine the user config with event to determine if permanent
3655          * addresses are to be removed from address hash table
3656          */
3657         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3658
3659         /* Step 2: clear hash table */
3660         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3661                 struct hlist_head *h = &inet6_addr_lst[i];
3662
3663                 spin_lock_bh(&addrconf_hash_lock);
3664 restart:
3665                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3666                         if (ifa->idev == idev) {
3667                                 addrconf_del_dad_work(ifa);
3668                                 /* combined flag + permanent flag decide if
3669                                  * address is retained on a down event
3670                                  */
3671                                 if (!keep_addr ||
3672                                     !(ifa->flags & IFA_F_PERMANENT) ||
3673                                     addr_is_local(&ifa->addr)) {
3674                                         hlist_del_init_rcu(&ifa->addr_lst);
3675                                         goto restart;
3676                                 }
3677                         }
3678                 }
3679                 spin_unlock_bh(&addrconf_hash_lock);
3680         }
3681
3682         write_lock_bh(&idev->lock);
3683
3684         addrconf_del_rs_timer(idev);
3685
3686         /* Step 2: clear flags for stateless addrconf */
3687         if (!how)
3688                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3689
3690         /* Step 3: clear tempaddr list */
3691         while (!list_empty(&idev->tempaddr_list)) {
3692                 ifa = list_first_entry(&idev->tempaddr_list,
3693                                        struct inet6_ifaddr, tmp_list);
3694                 list_del(&ifa->tmp_list);
3695                 write_unlock_bh(&idev->lock);
3696                 spin_lock_bh(&ifa->lock);
3697
3698                 if (ifa->ifpub) {
3699                         in6_ifa_put(ifa->ifpub);
3700                         ifa->ifpub = NULL;
3701                 }
3702                 spin_unlock_bh(&ifa->lock);
3703                 in6_ifa_put(ifa);
3704                 write_lock_bh(&idev->lock);
3705         }
3706
3707         /* re-combine the user config with event to determine if permanent
3708          * addresses are to be removed from the interface list
3709          */
3710         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3711
3712         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3713                 struct rt6_info *rt = NULL;
3714                 bool keep;
3715
3716                 addrconf_del_dad_work(ifa);
3717
3718                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3719                         !addr_is_local(&ifa->addr);
3720
3721                 write_unlock_bh(&idev->lock);
3722                 spin_lock_bh(&ifa->lock);
3723
3724                 if (keep) {
3725                         /* set state to skip the notifier below */
3726                         state = INET6_IFADDR_STATE_DEAD;
3727                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3728                         if (!(ifa->flags & IFA_F_NODAD))
3729                                 ifa->flags |= IFA_F_TENTATIVE;
3730
3731                         rt = ifa->rt;
3732                         ifa->rt = NULL;
3733                 } else {
3734                         state = ifa->state;
3735                         ifa->state = INET6_IFADDR_STATE_DEAD;
3736                 }
3737
3738                 spin_unlock_bh(&ifa->lock);
3739
3740                 if (rt)
3741                         ip6_del_rt(net, rt);
3742
3743                 if (state != INET6_IFADDR_STATE_DEAD) {
3744                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3745                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3746                 } else {
3747                         if (idev->cnf.forwarding)
3748                                 addrconf_leave_anycast(ifa);
3749                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3750                 }
3751
3752                 write_lock_bh(&idev->lock);
3753                 if (!keep) {
3754                         list_del_rcu(&ifa->if_list);
3755                         in6_ifa_put(ifa);
3756                 }
3757         }
3758
3759         write_unlock_bh(&idev->lock);
3760
3761         /* Step 5: Discard anycast and multicast list */
3762         if (how) {
3763                 ipv6_ac_destroy_dev(idev);
3764                 ipv6_mc_destroy_dev(idev);
3765         } else {
3766                 ipv6_mc_down(idev);
3767         }
3768
3769         idev->tstamp = jiffies;
3770
3771         /* Last: Shot the device (if unregistered) */
3772         if (how) {
3773                 addrconf_sysctl_unregister(idev);
3774                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3775                 neigh_ifdown(&nd_tbl, dev);
3776                 in6_dev_put(idev);
3777         }
3778         return 0;
3779 }
3780
3781 static void addrconf_rs_timer(struct timer_list *t)
3782 {
3783         struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3784         struct net_device *dev = idev->dev;
3785         struct in6_addr lladdr;
3786
3787         write_lock(&idev->lock);
3788         if (idev->dead || !(idev->if_flags & IF_READY))
3789                 goto out;
3790
3791         if (!ipv6_accept_ra(idev))
3792                 goto out;
3793
3794         /* Announcement received after solicitation was sent */
3795         if (idev->if_flags & IF_RA_RCVD)
3796                 goto out;
3797
3798         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3799                 write_unlock(&idev->lock);
3800                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3801                         ndisc_send_rs(dev, &lladdr,
3802                                       &in6addr_linklocal_allrouters);
3803                 else
3804                         goto put;
3805
3806                 write_lock(&idev->lock);
3807                 idev->rs_interval = rfc3315_s14_backoff_update(
3808                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3809                 /* The wait after the last probe can be shorter */
3810                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3811                                              idev->cnf.rtr_solicits) ?
3812                                       idev->cnf.rtr_solicit_delay :
3813                                       idev->rs_interval);
3814         } else {
3815                 /*
3816                  * Note: we do not support deprecated "all on-link"
3817                  * assumption any longer.
3818                  */
3819                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3820         }
3821
3822 out:
3823         write_unlock(&idev->lock);
3824 put:
3825         in6_dev_put(idev);
3826 }
3827
3828 /*
3829  *      Duplicate Address Detection
3830  */
3831 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3832 {
3833         unsigned long rand_num;
3834         struct inet6_dev *idev = ifp->idev;
3835         u64 nonce;
3836
3837         if (ifp->flags & IFA_F_OPTIMISTIC)
3838                 rand_num = 0;
3839         else
3840                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3841
3842         nonce = 0;
3843         if (idev->cnf.enhanced_dad ||
3844             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3845                 do
3846                         get_random_bytes(&nonce, 6);
3847                 while (nonce == 0);
3848         }
3849         ifp->dad_nonce = nonce;
3850         ifp->dad_probes = idev->cnf.dad_transmits;
3851         addrconf_mod_dad_work(ifp, rand_num);
3852 }
3853
3854 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3855 {
3856         struct inet6_dev *idev = ifp->idev;
3857         struct net_device *dev = idev->dev;
3858         bool bump_id, notify = false;
3859         struct net *net;
3860
3861         addrconf_join_solict(dev, &ifp->addr);
3862
3863         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3864
3865         read_lock_bh(&idev->lock);
3866         spin_lock(&ifp->lock);
3867         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3868                 goto out;
3869
3870         net = dev_net(dev);
3871         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3872             (net->ipv6.devconf_all->accept_dad < 1 &&
3873              idev->cnf.accept_dad < 1) ||
3874             !(ifp->flags&IFA_F_TENTATIVE) ||
3875             ifp->flags & IFA_F_NODAD) {
3876                 bool send_na = false;
3877
3878                 if (ifp->flags & IFA_F_TENTATIVE &&
3879                     !(ifp->flags & IFA_F_OPTIMISTIC))
3880                         send_na = true;
3881                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3882                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3883                 spin_unlock(&ifp->lock);
3884                 read_unlock_bh(&idev->lock);
3885
3886                 addrconf_dad_completed(ifp, bump_id, send_na);
3887                 return;
3888         }
3889
3890         if (!(idev->if_flags & IF_READY)) {
3891                 spin_unlock(&ifp->lock);
3892                 read_unlock_bh(&idev->lock);
3893                 /*
3894                  * If the device is not ready:
3895                  * - keep it tentative if it is a permanent address.
3896                  * - otherwise, kill it.
3897                  */
3898                 in6_ifa_hold(ifp);
3899                 addrconf_dad_stop(ifp, 0);
3900                 return;
3901         }
3902
3903         /*
3904          * Optimistic nodes can start receiving
3905          * Frames right away
3906          */
3907         if (ifp->flags & IFA_F_OPTIMISTIC) {
3908                 ip6_ins_rt(net, ifp->rt);
3909                 if (ipv6_use_optimistic_addr(net, idev)) {
3910                         /* Because optimistic nodes can use this address,
3911                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3912                          */
3913                         notify = true;
3914                 }
3915         }
3916
3917         addrconf_dad_kick(ifp);
3918 out:
3919         spin_unlock(&ifp->lock);
3920         read_unlock_bh(&idev->lock);
3921         if (notify)
3922                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3923 }
3924
3925 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3926 {
3927         bool begin_dad = false;
3928
3929         spin_lock_bh(&ifp->lock);
3930         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3931                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3932                 begin_dad = true;
3933         }
3934         spin_unlock_bh(&ifp->lock);
3935
3936         if (begin_dad)
3937                 addrconf_mod_dad_work(ifp, 0);
3938 }
3939
3940 static void addrconf_dad_work(struct work_struct *w)
3941 {
3942         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3943                                                 struct inet6_ifaddr,
3944                                                 dad_work);
3945         struct inet6_dev *idev = ifp->idev;
3946         bool bump_id, disable_ipv6 = false;
3947         struct in6_addr mcaddr;
3948
3949         enum {
3950                 DAD_PROCESS,
3951                 DAD_BEGIN,
3952                 DAD_ABORT,
3953         } action = DAD_PROCESS;
3954
3955         rtnl_lock();
3956
3957         spin_lock_bh(&ifp->lock);
3958         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3959                 action = DAD_BEGIN;
3960                 ifp->state = INET6_IFADDR_STATE_DAD;
3961         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3962                 action = DAD_ABORT;
3963                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3964
3965                 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3966                      idev->cnf.accept_dad > 1) &&
3967                     !idev->cnf.disable_ipv6 &&
3968                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3969                         struct in6_addr addr;
3970
3971                         addr.s6_addr32[0] = htonl(0xfe800000);
3972                         addr.s6_addr32[1] = 0;
3973
3974                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3975                             ipv6_addr_equal(&ifp->addr, &addr)) {
3976                                 /* DAD failed for link-local based on MAC */
3977                                 idev->cnf.disable_ipv6 = 1;
3978
3979                                 pr_info("%s: IPv6 being disabled!\n",
3980                                         ifp->idev->dev->name);
3981                                 disable_ipv6 = true;
3982                         }
3983                 }
3984         }
3985         spin_unlock_bh(&ifp->lock);
3986
3987         if (action == DAD_BEGIN) {
3988                 addrconf_dad_begin(ifp);
3989                 goto out;
3990         } else if (action == DAD_ABORT) {
3991                 in6_ifa_hold(ifp);
3992                 addrconf_dad_stop(ifp, 1);
3993                 if (disable_ipv6)
3994                         addrconf_ifdown(idev->dev, 0);
3995                 goto out;
3996         }
3997
3998         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3999                 goto out;
4000
4001         write_lock_bh(&idev->lock);
4002         if (idev->dead || !(idev->if_flags & IF_READY)) {
4003                 write_unlock_bh(&idev->lock);
4004                 goto out;
4005         }
4006
4007         spin_lock(&ifp->lock);
4008         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4009                 spin_unlock(&ifp->lock);
4010                 write_unlock_bh(&idev->lock);
4011                 goto out;
4012         }
4013
4014         if (ifp->dad_probes == 0) {
4015                 bool send_na = false;
4016
4017                 /*
4018                  * DAD was successful
4019                  */
4020
4021                 if (ifp->flags & IFA_F_TENTATIVE &&
4022                     !(ifp->flags & IFA_F_OPTIMISTIC))
4023                         send_na = true;
4024                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4025                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4026                 spin_unlock(&ifp->lock);
4027                 write_unlock_bh(&idev->lock);
4028
4029                 addrconf_dad_completed(ifp, bump_id, send_na);
4030
4031                 goto out;
4032         }
4033
4034         ifp->dad_probes--;
4035         addrconf_mod_dad_work(ifp,
4036                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4037         spin_unlock(&ifp->lock);
4038         write_unlock_bh(&idev->lock);
4039
4040         /* send a neighbour solicitation for our addr */
4041         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4042         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4043                       ifp->dad_nonce);
4044 out:
4045         in6_ifa_put(ifp);
4046         rtnl_unlock();
4047 }
4048
4049 /* ifp->idev must be at least read locked */
4050 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4051 {
4052         struct inet6_ifaddr *ifpiter;
4053         struct inet6_dev *idev = ifp->idev;
4054
4055         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4056                 if (ifpiter->scope > IFA_LINK)
4057                         break;
4058                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4059                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4060                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4061                     IFA_F_PERMANENT)
4062                         return false;
4063         }
4064         return true;
4065 }
4066
4067 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4068                                    bool send_na)
4069 {
4070         struct net_device *dev = ifp->idev->dev;
4071         struct in6_addr lladdr;
4072         bool send_rs, send_mld;
4073
4074         addrconf_del_dad_work(ifp);
4075
4076         /*
4077          *      Configure the address for reception. Now it is valid.
4078          */
4079
4080         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4081
4082         /* If added prefix is link local and we are prepared to process
4083            router advertisements, start sending router solicitations.
4084          */
4085
4086         read_lock_bh(&ifp->idev->lock);
4087         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4088         send_rs = send_mld &&
4089                   ipv6_accept_ra(ifp->idev) &&
4090                   ifp->idev->cnf.rtr_solicits != 0 &&
4091                   (dev->flags&IFF_LOOPBACK) == 0;
4092         read_unlock_bh(&ifp->idev->lock);
4093
4094         /* While dad is in progress mld report's source address is in6_addrany.
4095          * Resend with proper ll now.
4096          */
4097         if (send_mld)
4098                 ipv6_mc_dad_complete(ifp->idev);
4099
4100         /* send unsolicited NA if enabled */
4101         if (send_na &&
4102             (ifp->idev->cnf.ndisc_notify ||
4103              dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4104                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4105                               /*router=*/ !!ifp->idev->cnf.forwarding,
4106                               /*solicited=*/ false, /*override=*/ true,
4107                               /*inc_opt=*/ true);
4108         }
4109
4110         if (send_rs) {
4111                 /*
4112                  *      If a host as already performed a random delay
4113                  *      [...] as part of DAD [...] there is no need
4114                  *      to delay again before sending the first RS
4115                  */
4116                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4117                         return;
4118                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4119
4120                 write_lock_bh(&ifp->idev->lock);
4121                 spin_lock(&ifp->lock);
4122                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4123                         ifp->idev->cnf.rtr_solicit_interval);
4124                 ifp->idev->rs_probes = 1;
4125                 ifp->idev->if_flags |= IF_RS_SENT;
4126                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4127                 spin_unlock(&ifp->lock);
4128                 write_unlock_bh(&ifp->idev->lock);
4129         }
4130
4131         if (bump_id)
4132                 rt_genid_bump_ipv6(dev_net(dev));
4133
4134         /* Make sure that a new temporary address will be created
4135          * before this temporary address becomes deprecated.
4136          */
4137         if (ifp->flags & IFA_F_TEMPORARY)
4138                 addrconf_verify_rtnl();
4139 }
4140
4141 static void addrconf_dad_run(struct inet6_dev *idev)
4142 {
4143         struct inet6_ifaddr *ifp;
4144
4145         read_lock_bh(&idev->lock);
4146         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4147                 spin_lock(&ifp->lock);
4148                 if (ifp->flags & IFA_F_TENTATIVE &&
4149                     ifp->state == INET6_IFADDR_STATE_DAD)
4150                         addrconf_dad_kick(ifp);
4151                 spin_unlock(&ifp->lock);
4152         }
4153         read_unlock_bh(&idev->lock);
4154 }
4155
4156 #ifdef CONFIG_PROC_FS
4157 struct if6_iter_state {
4158         struct seq_net_private p;
4159         int bucket;
4160         int offset;
4161 };
4162
4163 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4164 {
4165         struct if6_iter_state *state = seq->private;
4166         struct net *net = seq_file_net(seq);
4167         struct inet6_ifaddr *ifa = NULL;
4168         int p = 0;
4169
4170         /* initial bucket if pos is 0 */
4171         if (pos == 0) {
4172                 state->bucket = 0;
4173                 state->offset = 0;
4174         }
4175
4176         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4177                 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4178                                          addr_lst) {
4179                         if (!net_eq(dev_net(ifa->idev->dev), net))
4180                                 continue;
4181                         /* sync with offset */
4182                         if (p < state->offset) {
4183                                 p++;
4184                                 continue;
4185                         }
4186                         state->offset++;
4187                         return ifa;
4188                 }
4189
4190                 /* prepare for next bucket */
4191                 state->offset = 0;
4192                 p = 0;
4193         }
4194         return NULL;
4195 }
4196
4197 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4198                                          struct inet6_ifaddr *ifa)
4199 {
4200         struct if6_iter_state *state = seq->private;
4201         struct net *net = seq_file_net(seq);
4202
4203         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4204                 if (!net_eq(dev_net(ifa->idev->dev), net))
4205                         continue;
4206                 state->offset++;
4207                 return ifa;
4208         }
4209
4210         while (++state->bucket < IN6_ADDR_HSIZE) {
4211                 state->offset = 0;
4212                 hlist_for_each_entry_rcu(ifa,
4213                                      &inet6_addr_lst[state->bucket], addr_lst) {
4214                         if (!net_eq(dev_net(ifa->idev->dev), net))
4215                                 continue;
4216                         state->offset++;
4217                         return ifa;
4218                 }
4219         }
4220
4221         return NULL;
4222 }
4223
4224 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4225         __acquires(rcu)
4226 {
4227         rcu_read_lock();
4228         return if6_get_first(seq, *pos);
4229 }
4230
4231 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4232 {
4233         struct inet6_ifaddr *ifa;
4234
4235         ifa = if6_get_next(seq, v);
4236         ++*pos;
4237         return ifa;
4238 }
4239
4240 static void if6_seq_stop(struct seq_file *seq, void *v)
4241         __releases(rcu)
4242 {
4243         rcu_read_unlock();
4244 }
4245
4246 static int if6_seq_show(struct seq_file *seq, void *v)
4247 {
4248         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4249         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4250                    &ifp->addr,
4251                    ifp->idev->dev->ifindex,
4252                    ifp->prefix_len,
4253                    ifp->scope,
4254                    (u8) ifp->flags,
4255                    ifp->idev->dev->name);
4256         return 0;
4257 }
4258
4259 static const struct seq_operations if6_seq_ops = {
4260         .start  = if6_seq_start,
4261         .next   = if6_seq_next,
4262         .show   = if6_seq_show,
4263         .stop   = if6_seq_stop,
4264 };
4265
4266 static int if6_seq_open(struct inode *inode, struct file *file)
4267 {
4268         return seq_open_net(inode, file, &if6_seq_ops,
4269                             sizeof(struct if6_iter_state));
4270 }
4271
4272 static const struct file_operations if6_fops = {
4273         .open           = if6_seq_open,
4274         .read           = seq_read,
4275         .llseek         = seq_lseek,
4276         .release        = seq_release_net,
4277 };
4278
4279 static int __net_init if6_proc_net_init(struct net *net)
4280 {
4281         if (!proc_create("if_inet6", 0444, net->proc_net, &if6_fops))
4282                 return -ENOMEM;
4283         return 0;
4284 }
4285
4286 static void __net_exit if6_proc_net_exit(struct net *net)
4287 {
4288         remove_proc_entry("if_inet6", net->proc_net);
4289 }
4290
4291 static struct pernet_operations if6_proc_net_ops = {
4292         .init = if6_proc_net_init,
4293         .exit = if6_proc_net_exit,
4294 };
4295
4296 int __init if6_proc_init(void)
4297 {
4298         return register_pernet_subsys(&if6_proc_net_ops);
4299 }
4300
4301 void if6_proc_exit(void)
4302 {
4303         unregister_pernet_subsys(&if6_proc_net_ops);
4304 }
4305 #endif  /* CONFIG_PROC_FS */
4306
4307 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4308 /* Check if address is a home address configured on any interface. */
4309 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4310 {
4311         unsigned int hash = inet6_addr_hash(net, addr);
4312         struct inet6_ifaddr *ifp = NULL;
4313         int ret = 0;
4314
4315         rcu_read_lock();
4316         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4317                 if (!net_eq(dev_net(ifp->idev->dev), net))
4318                         continue;
4319                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4320                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4321                         ret = 1;
4322                         break;
4323                 }
4324         }
4325         rcu_read_unlock();
4326         return ret;
4327 }
4328 #endif
4329
4330 /*
4331  *      Periodic address status verification
4332  */
4333
4334 static void addrconf_verify_rtnl(void)
4335 {
4336         unsigned long now, next, next_sec, next_sched;
4337         struct inet6_ifaddr *ifp;
4338         int i;
4339
4340         ASSERT_RTNL();
4341
4342         rcu_read_lock_bh();
4343         now = jiffies;
4344         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4345
4346         cancel_delayed_work(&addr_chk_work);
4347
4348         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4349 restart:
4350                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4351                         unsigned long age;
4352
4353                         /* When setting preferred_lft to a value not zero or
4354                          * infinity, while valid_lft is infinity
4355                          * IFA_F_PERMANENT has a non-infinity life time.
4356                          */
4357                         if ((ifp->flags & IFA_F_PERMANENT) &&
4358                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4359                                 continue;
4360
4361                         spin_lock(&ifp->lock);
4362                         /* We try to batch several events at once. */
4363                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4364
4365                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4366                             age >= ifp->valid_lft) {
4367                                 spin_unlock(&ifp->lock);
4368                                 in6_ifa_hold(ifp);
4369                                 ipv6_del_addr(ifp);
4370                                 goto restart;
4371                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4372                                 spin_unlock(&ifp->lock);
4373                                 continue;
4374                         } else if (age >= ifp->prefered_lft) {
4375                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4376                                 int deprecate = 0;
4377
4378                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4379                                         deprecate = 1;
4380                                         ifp->flags |= IFA_F_DEPRECATED;
4381                                 }
4382
4383                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4384                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4385                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4386
4387                                 spin_unlock(&ifp->lock);
4388
4389                                 if (deprecate) {
4390                                         in6_ifa_hold(ifp);
4391
4392                                         ipv6_ifa_notify(0, ifp);
4393                                         in6_ifa_put(ifp);
4394                                         goto restart;
4395                                 }
4396                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4397                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4398                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4399                                         ifp->idev->cnf.dad_transmits *
4400                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4401
4402                                 if (age >= ifp->prefered_lft - regen_advance) {
4403                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4404                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4405                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4406                                         if (!ifp->regen_count && ifpub) {
4407                                                 ifp->regen_count++;
4408                                                 in6_ifa_hold(ifp);
4409                                                 in6_ifa_hold(ifpub);
4410                                                 spin_unlock(&ifp->lock);
4411
4412                                                 spin_lock(&ifpub->lock);
4413                                                 ifpub->regen_count = 0;
4414                                                 spin_unlock(&ifpub->lock);
4415                                                 rcu_read_unlock_bh();
4416                                                 ipv6_create_tempaddr(ifpub, ifp, true);
4417                                                 in6_ifa_put(ifpub);
4418                                                 in6_ifa_put(ifp);
4419                                                 rcu_read_lock_bh();
4420                                                 goto restart;
4421                                         }
4422                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4423                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4424                                 spin_unlock(&ifp->lock);
4425                         } else {
4426                                 /* ifp->prefered_lft <= ifp->valid_lft */
4427                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4428                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4429                                 spin_unlock(&ifp->lock);
4430                         }
4431                 }
4432         }
4433
4434         next_sec = round_jiffies_up(next);
4435         next_sched = next;
4436
4437         /* If rounded timeout is accurate enough, accept it. */
4438         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4439                 next_sched = next_sec;
4440
4441         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4442         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4443                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4444
4445         pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4446                  now, next, next_sec, next_sched);
4447         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4448         rcu_read_unlock_bh();
4449 }
4450
4451 static void addrconf_verify_work(struct work_struct *w)
4452 {
4453         rtnl_lock();
4454         addrconf_verify_rtnl();
4455         rtnl_unlock();
4456 }
4457
4458 static void addrconf_verify(void)
4459 {
4460         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4461 }
4462
4463 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4464                                      struct in6_addr **peer_pfx)
4465 {
4466         struct in6_addr *pfx = NULL;
4467
4468         *peer_pfx = NULL;
4469
4470         if (addr)
4471                 pfx = nla_data(addr);
4472
4473         if (local) {
4474                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4475                         *peer_pfx = pfx;
4476                 pfx = nla_data(local);
4477         }
4478
4479         return pfx;
4480 }
4481
4482 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4483         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4484         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4485         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4486         [IFA_FLAGS]             = { .len = sizeof(u32) },
4487 };
4488
4489 static int
4490 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4491                   struct netlink_ext_ack *extack)
4492 {
4493         struct net *net = sock_net(skb->sk);
4494         struct ifaddrmsg *ifm;
4495         struct nlattr *tb[IFA_MAX+1];
4496         struct in6_addr *pfx, *peer_pfx;
4497         u32 ifa_flags;
4498         int err;
4499
4500         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4501                           extack);
4502         if (err < 0)
4503                 return err;
4504
4505         ifm = nlmsg_data(nlh);
4506         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4507         if (!pfx)
4508                 return -EINVAL;
4509
4510         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4511
4512         /* We ignore other flags so far. */
4513         ifa_flags &= IFA_F_MANAGETEMPADDR;
4514
4515         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4516                               ifm->ifa_prefixlen);
4517 }
4518
4519 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4520                              u32 prefered_lft, u32 valid_lft)
4521 {
4522         u32 flags;
4523         clock_t expires;
4524         unsigned long timeout;
4525         bool was_managetempaddr;
4526         bool had_prefixroute;
4527
4528         ASSERT_RTNL();
4529
4530         if (!valid_lft || (prefered_lft > valid_lft))
4531                 return -EINVAL;
4532
4533         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4534             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4535                 return -EINVAL;
4536
4537         if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4538                 ifa_flags &= ~IFA_F_OPTIMISTIC;
4539
4540         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4541         if (addrconf_finite_timeout(timeout)) {
4542                 expires = jiffies_to_clock_t(timeout * HZ);
4543                 valid_lft = timeout;
4544                 flags = RTF_EXPIRES;
4545         } else {
4546                 expires = 0;
4547                 flags = 0;
4548                 ifa_flags |= IFA_F_PERMANENT;
4549         }
4550
4551         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4552         if (addrconf_finite_timeout(timeout)) {
4553                 if (timeout == 0)
4554                         ifa_flags |= IFA_F_DEPRECATED;
4555                 prefered_lft = timeout;
4556         }
4557
4558         spin_lock_bh(&ifp->lock);
4559         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4560         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4561                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4562         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4563                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4564                         IFA_F_NOPREFIXROUTE);
4565         ifp->flags |= ifa_flags;
4566         ifp->tstamp = jiffies;
4567         ifp->valid_lft = valid_lft;
4568         ifp->prefered_lft = prefered_lft;
4569
4570         spin_unlock_bh(&ifp->lock);
4571         if (!(ifp->flags&IFA_F_TENTATIVE))
4572                 ipv6_ifa_notify(0, ifp);
4573
4574         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4575                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4576                                       expires, flags);
4577         } else if (had_prefixroute) {
4578                 enum cleanup_prefix_rt_t action;
4579                 unsigned long rt_expires;
4580
4581                 write_lock_bh(&ifp->idev->lock);
4582                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4583                 write_unlock_bh(&ifp->idev->lock);
4584
4585                 if (action != CLEANUP_PREFIX_RT_NOP) {
4586                         cleanup_prefix_route(ifp, rt_expires,
4587                                 action == CLEANUP_PREFIX_RT_DEL);
4588                 }
4589         }
4590
4591         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4592                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4593                         valid_lft = prefered_lft = 0;
4594                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4595                                  !was_managetempaddr, jiffies);
4596         }
4597
4598         addrconf_verify_rtnl();
4599
4600         return 0;
4601 }
4602
4603 static int
4604 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4605                   struct netlink_ext_ack *extack)
4606 {
4607         struct net *net = sock_net(skb->sk);
4608         struct ifaddrmsg *ifm;
4609         struct nlattr *tb[IFA_MAX+1];
4610         struct in6_addr *pfx, *peer_pfx;
4611         struct inet6_ifaddr *ifa;
4612         struct net_device *dev;
4613         struct inet6_dev *idev;
4614         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4615         u32 ifa_flags;
4616         int err;
4617
4618         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4619                           extack);
4620         if (err < 0)
4621                 return err;
4622
4623         ifm = nlmsg_data(nlh);
4624         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4625         if (!pfx)
4626                 return -EINVAL;
4627
4628         if (tb[IFA_CACHEINFO]) {
4629                 struct ifa_cacheinfo *ci;
4630
4631                 ci = nla_data(tb[IFA_CACHEINFO]);
4632                 valid_lft = ci->ifa_valid;
4633                 preferred_lft = ci->ifa_prefered;
4634         } else {
4635                 preferred_lft = INFINITY_LIFE_TIME;
4636                 valid_lft = INFINITY_LIFE_TIME;
4637         }
4638
4639         dev =  __dev_get_by_index(net, ifm->ifa_index);
4640         if (!dev)
4641                 return -ENODEV;
4642
4643         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4644
4645         /* We ignore other flags so far. */
4646         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4647                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4648
4649         idev = ipv6_find_idev(dev);
4650         if (IS_ERR(idev))
4651                 return PTR_ERR(idev);
4652
4653         if (!ipv6_allow_optimistic_dad(net, idev))
4654                 ifa_flags &= ~IFA_F_OPTIMISTIC;
4655
4656         if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) {
4657                 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4658                 return -EINVAL;
4659         }
4660
4661         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4662         if (!ifa) {
4663                 /*
4664                  * It would be best to check for !NLM_F_CREATE here but
4665                  * userspace already relies on not having to provide this.
4666                  */
4667                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4668                                       ifm->ifa_prefixlen, ifa_flags,
4669                                       preferred_lft, valid_lft, extack);
4670         }
4671
4672         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4673             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4674                 err = -EEXIST;
4675         else
4676                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4677
4678         in6_ifa_put(ifa);
4679
4680         return err;
4681 }
4682
4683 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4684                           u8 scope, int ifindex)
4685 {
4686         struct ifaddrmsg *ifm;
4687
4688         ifm = nlmsg_data(nlh);
4689         ifm->ifa_family = AF_INET6;
4690         ifm->ifa_prefixlen = prefixlen;
4691         ifm->ifa_flags = flags;
4692         ifm->ifa_scope = scope;
4693         ifm->ifa_index = ifindex;
4694 }
4695
4696 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4697                          unsigned long tstamp, u32 preferred, u32 valid)
4698 {
4699         struct ifa_cacheinfo ci;
4700
4701         ci.cstamp = cstamp_delta(cstamp);
4702         ci.tstamp = cstamp_delta(tstamp);
4703         ci.ifa_prefered = preferred;
4704         ci.ifa_valid = valid;
4705
4706         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4707 }
4708
4709 static inline int rt_scope(int ifa_scope)
4710 {
4711         if (ifa_scope & IFA_HOST)
4712                 return RT_SCOPE_HOST;
4713         else if (ifa_scope & IFA_LINK)
4714                 return RT_SCOPE_LINK;
4715         else if (ifa_scope & IFA_SITE)
4716                 return RT_SCOPE_SITE;
4717         else
4718                 return RT_SCOPE_UNIVERSE;
4719 }
4720
4721 static inline int inet6_ifaddr_msgsize(void)
4722 {
4723         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4724                + nla_total_size(16) /* IFA_LOCAL */
4725                + nla_total_size(16) /* IFA_ADDRESS */
4726                + nla_total_size(sizeof(struct ifa_cacheinfo))
4727                + nla_total_size(4)  /* IFA_FLAGS */;
4728 }
4729
4730 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4731                              u32 portid, u32 seq, int event, unsigned int flags)
4732 {
4733         struct nlmsghdr  *nlh;
4734         u32 preferred, valid;
4735
4736         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4737         if (!nlh)
4738                 return -EMSGSIZE;
4739
4740         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4741                       ifa->idev->dev->ifindex);
4742
4743         if (!((ifa->flags&IFA_F_PERMANENT) &&
4744               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4745                 preferred = ifa->prefered_lft;
4746                 valid = ifa->valid_lft;
4747                 if (preferred != INFINITY_LIFE_TIME) {
4748                         long tval = (jiffies - ifa->tstamp)/HZ;
4749                         if (preferred > tval)
4750                                 preferred -= tval;
4751                         else
4752                                 preferred = 0;
4753                         if (valid != INFINITY_LIFE_TIME) {
4754                                 if (valid > tval)
4755                                         valid -= tval;
4756                                 else
4757                                         valid = 0;
4758                         }
4759                 }
4760         } else {
4761                 preferred = INFINITY_LIFE_TIME;
4762                 valid = INFINITY_LIFE_TIME;
4763         }
4764
4765         if (!ipv6_addr_any(&ifa->peer_addr)) {
4766                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4767                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4768                         goto error;
4769         } else
4770                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4771                         goto error;
4772
4773         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4774                 goto error;
4775
4776         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4777                 goto error;
4778
4779         nlmsg_end(skb, nlh);
4780         return 0;
4781
4782 error:
4783         nlmsg_cancel(skb, nlh);
4784         return -EMSGSIZE;
4785 }
4786
4787 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4788                                 u32 portid, u32 seq, int event, u16 flags)
4789 {
4790         struct nlmsghdr  *nlh;
4791         u8 scope = RT_SCOPE_UNIVERSE;
4792         int ifindex = ifmca->idev->dev->ifindex;
4793
4794         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4795                 scope = RT_SCOPE_SITE;
4796
4797         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4798         if (!nlh)
4799                 return -EMSGSIZE;
4800
4801         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4802         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4803             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4804                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4805                 nlmsg_cancel(skb, nlh);
4806                 return -EMSGSIZE;
4807         }
4808
4809         nlmsg_end(skb, nlh);
4810         return 0;
4811 }
4812
4813 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4814                                 u32 portid, u32 seq, int event, unsigned int flags)
4815 {
4816         struct nlmsghdr  *nlh;
4817         u8 scope = RT_SCOPE_UNIVERSE;
4818         int ifindex = ifaca->aca_idev->dev->ifindex;
4819
4820         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4821                 scope = RT_SCOPE_SITE;
4822
4823         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4824         if (!nlh)
4825                 return -EMSGSIZE;
4826
4827         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4828         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4829             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4830                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4831                 nlmsg_cancel(skb, nlh);
4832                 return -EMSGSIZE;
4833         }
4834
4835         nlmsg_end(skb, nlh);
4836         return 0;
4837 }
4838
4839 enum addr_type_t {
4840         UNICAST_ADDR,
4841         MULTICAST_ADDR,
4842         ANYCAST_ADDR,
4843 };
4844
4845 /* called with rcu_read_lock() */
4846 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4847                           struct netlink_callback *cb, enum addr_type_t type,
4848                           int s_ip_idx, int *p_ip_idx)
4849 {
4850         struct ifmcaddr6 *ifmca;
4851         struct ifacaddr6 *ifaca;
4852         int err = 1;
4853         int ip_idx = *p_ip_idx;
4854
4855         read_lock_bh(&idev->lock);
4856         switch (type) {
4857         case UNICAST_ADDR: {
4858                 struct inet6_ifaddr *ifa;
4859
4860                 /* unicast address incl. temp addr */
4861                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4862                         if (++ip_idx < s_ip_idx)
4863                                 continue;
4864                         err = inet6_fill_ifaddr(skb, ifa,
4865                                                 NETLINK_CB(cb->skb).portid,
4866                                                 cb->nlh->nlmsg_seq,
4867                                                 RTM_NEWADDR,
4868                                                 NLM_F_MULTI);
4869                         if (err < 0)
4870                                 break;
4871                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4872                 }
4873                 break;
4874         }
4875         case MULTICAST_ADDR:
4876                 /* multicast address */
4877                 for (ifmca = idev->mc_list; ifmca;
4878                      ifmca = ifmca->next, ip_idx++) {
4879                         if (ip_idx < s_ip_idx)
4880                                 continue;
4881                         err = inet6_fill_ifmcaddr(skb, ifmca,
4882                                                   NETLINK_CB(cb->skb).portid,
4883                                                   cb->nlh->nlmsg_seq,
4884                                                   RTM_GETMULTICAST,
4885                                                   NLM_F_MULTI);
4886                         if (err < 0)
4887                                 break;
4888                 }
4889                 break;
4890         case ANYCAST_ADDR:
4891                 /* anycast address */
4892                 for (ifaca = idev->ac_list; ifaca;
4893                      ifaca = ifaca->aca_next, ip_idx++) {
4894                         if (ip_idx < s_ip_idx)
4895                                 continue;
4896                         err = inet6_fill_ifacaddr(skb, ifaca,
4897                                                   NETLINK_CB(cb->skb).portid,
4898                                                   cb->nlh->nlmsg_seq,
4899                                                   RTM_GETANYCAST,
4900                                                   NLM_F_MULTI);
4901                         if (err < 0)
4902                                 break;
4903                 }
4904                 break;
4905         default:
4906                 break;
4907         }
4908         read_unlock_bh(&idev->lock);
4909         *p_ip_idx = ip_idx;
4910         return err;
4911 }
4912
4913 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4914                            enum addr_type_t type)
4915 {
4916         struct net *net = sock_net(skb->sk);
4917         int h, s_h;
4918         int idx, ip_idx;
4919         int s_idx, s_ip_idx;
4920         struct net_device *dev;
4921         struct inet6_dev *idev;
4922         struct hlist_head *head;
4923
4924         s_h = cb->args[0];
4925         s_idx = idx = cb->args[1];
4926         s_ip_idx = ip_idx = cb->args[2];
4927
4928         rcu_read_lock();
4929         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4930         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4931                 idx = 0;
4932                 head = &net->dev_index_head[h];
4933                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4934                         if (idx < s_idx)
4935                                 goto cont;
4936                         if (h > s_h || idx > s_idx)
4937                                 s_ip_idx = 0;
4938                         ip_idx = 0;
4939                         idev = __in6_dev_get(dev);
4940                         if (!idev)
4941                                 goto cont;
4942
4943                         if (in6_dump_addrs(idev, skb, cb, type,
4944                                            s_ip_idx, &ip_idx) < 0)
4945                                 goto done;
4946 cont:
4947                         idx++;
4948                 }
4949         }
4950 done:
4951         rcu_read_unlock();
4952         cb->args[0] = h;
4953         cb->args[1] = idx;
4954         cb->args[2] = ip_idx;
4955
4956         return skb->len;
4957 }
4958
4959 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4960 {
4961         enum addr_type_t type = UNICAST_ADDR;
4962
4963         return inet6_dump_addr(skb, cb, type);
4964 }
4965
4966 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4967 {
4968         enum addr_type_t type = MULTICAST_ADDR;
4969
4970         return inet6_dump_addr(skb, cb, type);
4971 }
4972
4973
4974 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4975 {
4976         enum addr_type_t type = ANYCAST_ADDR;
4977
4978         return inet6_dump_addr(skb, cb, type);
4979 }
4980
4981 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4982                              struct netlink_ext_ack *extack)
4983 {
4984         struct net *net = sock_net(in_skb->sk);
4985         struct ifaddrmsg *ifm;
4986         struct nlattr *tb[IFA_MAX+1];
4987         struct in6_addr *addr = NULL, *peer;
4988         struct net_device *dev = NULL;
4989         struct inet6_ifaddr *ifa;
4990         struct sk_buff *skb;
4991         int err;
4992
4993         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4994                           extack);
4995         if (err < 0)
4996                 return err;
4997
4998         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4999         if (!addr)
5000                 return -EINVAL;
5001
5002         ifm = nlmsg_data(nlh);
5003         if (ifm->ifa_index)
5004                 dev = dev_get_by_index(net, ifm->ifa_index);
5005
5006         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
5007         if (!ifa) {
5008                 err = -EADDRNOTAVAIL;
5009                 goto errout;
5010         }
5011
5012         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5013         if (!skb) {
5014                 err = -ENOBUFS;
5015                 goto errout_ifa;
5016         }
5017
5018         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
5019                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
5020         if (err < 0) {
5021                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5022                 WARN_ON(err == -EMSGSIZE);
5023                 kfree_skb(skb);
5024                 goto errout_ifa;
5025         }
5026         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5027 errout_ifa:
5028         in6_ifa_put(ifa);
5029 errout:
5030         if (dev)
5031                 dev_put(dev);
5032         return err;
5033 }
5034
5035 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5036 {
5037         struct sk_buff *skb;
5038         struct net *net = dev_net(ifa->idev->dev);
5039         int err = -ENOBUFS;
5040
5041         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5042         if (!skb)
5043                 goto errout;
5044
5045         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
5046         if (err < 0) {
5047                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5048                 WARN_ON(err == -EMSGSIZE);
5049                 kfree_skb(skb);
5050                 goto errout;
5051         }
5052         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5053         return;
5054 errout:
5055         if (err < 0)
5056                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5057 }
5058
5059 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5060                                 __s32 *array, int bytes)
5061 {
5062         BUG_ON(bytes < (DEVCONF_MAX * 4));
5063
5064         memset(array, 0, bytes);
5065         array[DEVCONF_FORWARDING] = cnf->forwarding;
5066         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5067         array[DEVCONF_MTU6] = cnf->mtu6;
5068         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5069         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5070         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5071         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5072         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5073         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5074                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5075         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5076                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5077         array[DEVCONF_RTR_SOLICIT_DELAY] =
5078                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5079         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5080         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5081                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5082         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5083                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5084         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5085         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5086         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5087         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5088         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5089         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5090         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5091         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5092         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5093 #ifdef CONFIG_IPV6_ROUTER_PREF
5094         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5095         array[DEVCONF_RTR_PROBE_INTERVAL] =
5096                 jiffies_to_msecs(cnf->rtr_probe_interval);
5097 #ifdef CONFIG_IPV6_ROUTE_INFO
5098         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5099         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5100 #endif
5101 #endif
5102         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5103         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5104 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5105         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5106         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5107 #endif
5108 #ifdef CONFIG_IPV6_MROUTE
5109         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5110 #endif
5111         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5112         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5113         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5114         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5115         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5116         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5117         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5118         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5119         /* we omit DEVCONF_STABLE_SECRET for now */
5120         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5121         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5122         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5123         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5124         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5125 #ifdef CONFIG_IPV6_SEG6_HMAC
5126         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5127 #endif
5128         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5129         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5130         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5131         array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5132 }
5133
5134 static inline size_t inet6_ifla6_size(void)
5135 {
5136         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5137              + nla_total_size(sizeof(struct ifla_cacheinfo))
5138              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5139              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5140              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5141              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5142 }
5143
5144 static inline size_t inet6_if_nlmsg_size(void)
5145 {
5146         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5147                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5148                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5149                + nla_total_size(4) /* IFLA_MTU */
5150                + nla_total_size(4) /* IFLA_LINK */
5151                + nla_total_size(1) /* IFLA_OPERSTATE */
5152                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5153 }
5154
5155 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5156                                         int bytes)
5157 {
5158         int i;
5159         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5160         BUG_ON(pad < 0);
5161
5162         /* Use put_unaligned() because stats may not be aligned for u64. */
5163         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5164         for (i = 1; i < ICMP6_MIB_MAX; i++)
5165                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5166
5167         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5168 }
5169
5170 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5171                                         int bytes, size_t syncpoff)
5172 {
5173         int i, c;
5174         u64 buff[IPSTATS_MIB_MAX];
5175         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5176
5177         BUG_ON(pad < 0);
5178
5179         memset(buff, 0, sizeof(buff));
5180         buff[0] = IPSTATS_MIB_MAX;
5181
5182         for_each_possible_cpu(c) {
5183                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5184                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5185         }
5186
5187         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5188         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5189 }
5190
5191 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5192                              int bytes)
5193 {
5194         switch (attrtype) {
5195         case IFLA_INET6_STATS:
5196                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5197                                      offsetof(struct ipstats_mib, syncp));
5198                 break;
5199         case IFLA_INET6_ICMP6STATS:
5200                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5201                 break;
5202         }
5203 }
5204
5205 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5206                                   u32 ext_filter_mask)
5207 {
5208         struct nlattr *nla;
5209         struct ifla_cacheinfo ci;
5210
5211         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5212                 goto nla_put_failure;
5213         ci.max_reasm_len = IPV6_MAXPLEN;
5214         ci.tstamp = cstamp_delta(idev->tstamp);
5215         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5216         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5217         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5218                 goto nla_put_failure;
5219         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5220         if (!nla)
5221                 goto nla_put_failure;
5222         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5223
5224         /* XXX - MC not implemented */
5225
5226         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5227                 return 0;
5228
5229         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5230         if (!nla)
5231                 goto nla_put_failure;
5232         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5233
5234         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5235         if (!nla)
5236                 goto nla_put_failure;
5237         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5238
5239         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5240         if (!nla)
5241                 goto nla_put_failure;
5242
5243         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5244                 goto nla_put_failure;
5245
5246         read_lock_bh(&idev->lock);
5247         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5248         read_unlock_bh(&idev->lock);
5249
5250         return 0;
5251
5252 nla_put_failure:
5253         return -EMSGSIZE;
5254 }
5255
5256 static size_t inet6_get_link_af_size(const struct net_device *dev,
5257                                      u32 ext_filter_mask)
5258 {
5259         if (!__in6_dev_get(dev))
5260                 return 0;
5261
5262         return inet6_ifla6_size();
5263 }
5264
5265 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5266                               u32 ext_filter_mask)
5267 {
5268         struct inet6_dev *idev = __in6_dev_get(dev);
5269
5270         if (!idev)
5271                 return -ENODATA;
5272
5273         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5274                 return -EMSGSIZE;
5275
5276         return 0;
5277 }
5278
5279 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5280 {
5281         struct inet6_ifaddr *ifp;
5282         struct net_device *dev = idev->dev;
5283         bool clear_token, update_rs = false;
5284         struct in6_addr ll_addr;
5285
5286         ASSERT_RTNL();
5287
5288         if (!token)
5289                 return -EINVAL;
5290         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5291                 return -EINVAL;
5292         if (!ipv6_accept_ra(idev))
5293                 return -EINVAL;
5294         if (idev->cnf.rtr_solicits == 0)
5295                 return -EINVAL;
5296
5297         write_lock_bh(&idev->lock);
5298
5299         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5300         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5301
5302         write_unlock_bh(&idev->lock);
5303
5304         clear_token = ipv6_addr_any(token);
5305         if (clear_token)
5306                 goto update_lft;
5307
5308         if (!idev->dead && (idev->if_flags & IF_READY) &&
5309             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5310                              IFA_F_OPTIMISTIC)) {
5311                 /* If we're not ready, then normal ifup will take care
5312                  * of this. Otherwise, we need to request our rs here.
5313                  */
5314                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5315                 update_rs = true;
5316         }
5317
5318 update_lft:
5319         write_lock_bh(&idev->lock);
5320
5321         if (update_rs) {
5322                 idev->if_flags |= IF_RS_SENT;
5323                 idev->rs_interval = rfc3315_s14_backoff_init(
5324                         idev->cnf.rtr_solicit_interval);
5325                 idev->rs_probes = 1;
5326                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5327         }
5328
5329         /* Well, that's kinda nasty ... */
5330         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5331                 spin_lock(&ifp->lock);
5332                 if (ifp->tokenized) {
5333                         ifp->valid_lft = 0;
5334                         ifp->prefered_lft = 0;
5335                 }
5336                 spin_unlock(&ifp->lock);
5337         }
5338
5339         write_unlock_bh(&idev->lock);
5340         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5341         addrconf_verify_rtnl();
5342         return 0;
5343 }
5344
5345 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5346         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5347         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5348 };
5349
5350 static int inet6_validate_link_af(const struct net_device *dev,
5351                                   const struct nlattr *nla)
5352 {
5353         struct nlattr *tb[IFLA_INET6_MAX + 1];
5354
5355         if (dev && !__in6_dev_get(dev))
5356                 return -EAFNOSUPPORT;
5357
5358         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5359                                 NULL);
5360 }
5361
5362 static int check_addr_gen_mode(int mode)
5363 {
5364         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5365             mode != IN6_ADDR_GEN_MODE_NONE &&
5366             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5367             mode != IN6_ADDR_GEN_MODE_RANDOM)
5368                 return -EINVAL;
5369         return 1;
5370 }
5371
5372 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5373                                 int mode)
5374 {
5375         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5376             !idev->cnf.stable_secret.initialized &&
5377             !net->ipv6.devconf_dflt->stable_secret.initialized)
5378                 return -EINVAL;
5379         return 1;
5380 }
5381
5382 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5383 {
5384         int err = -EINVAL;
5385         struct inet6_dev *idev = __in6_dev_get(dev);
5386         struct nlattr *tb[IFLA_INET6_MAX + 1];
5387
5388         if (!idev)
5389                 return -EAFNOSUPPORT;
5390
5391         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5392                 BUG();
5393
5394         if (tb[IFLA_INET6_TOKEN]) {
5395                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5396                 if (err)
5397                         return err;
5398         }
5399
5400         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5401                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5402
5403                 if (check_addr_gen_mode(mode) < 0 ||
5404                     check_stable_privacy(idev, dev_net(dev), mode) < 0)
5405                         return -EINVAL;
5406
5407                 idev->cnf.addr_gen_mode = mode;
5408                 err = 0;
5409         }
5410
5411         return err;
5412 }
5413
5414 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5415                              u32 portid, u32 seq, int event, unsigned int flags)
5416 {
5417         struct net_device *dev = idev->dev;
5418         struct ifinfomsg *hdr;
5419         struct nlmsghdr *nlh;
5420         void *protoinfo;
5421
5422         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5423         if (!nlh)
5424                 return -EMSGSIZE;
5425
5426         hdr = nlmsg_data(nlh);
5427         hdr->ifi_family = AF_INET6;
5428         hdr->__ifi_pad = 0;
5429         hdr->ifi_type = dev->type;
5430         hdr->ifi_index = dev->ifindex;
5431         hdr->ifi_flags = dev_get_flags(dev);
5432         hdr->ifi_change = 0;
5433
5434         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5435             (dev->addr_len &&
5436              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5437             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5438             (dev->ifindex != dev_get_iflink(dev) &&
5439              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5440             nla_put_u8(skb, IFLA_OPERSTATE,
5441                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5442                 goto nla_put_failure;
5443         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5444         if (!protoinfo)
5445                 goto nla_put_failure;
5446
5447         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5448                 goto nla_put_failure;
5449
5450         nla_nest_end(skb, protoinfo);
5451         nlmsg_end(skb, nlh);
5452         return 0;
5453
5454 nla_put_failure:
5455         nlmsg_cancel(skb, nlh);
5456         return -EMSGSIZE;
5457 }
5458
5459 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5460 {
5461         struct net *net = sock_net(skb->sk);
5462         int h, s_h;
5463         int idx = 0, s_idx;
5464         struct net_device *dev;
5465         struct inet6_dev *idev;
5466         struct hlist_head *head;
5467
5468         s_h = cb->args[0];
5469         s_idx = cb->args[1];
5470
5471         rcu_read_lock();
5472         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5473                 idx = 0;
5474                 head = &net->dev_index_head[h];
5475                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5476                         if (idx < s_idx)
5477                                 goto cont;
5478                         idev = __in6_dev_get(dev);
5479                         if (!idev)
5480                                 goto cont;
5481                         if (inet6_fill_ifinfo(skb, idev,
5482                                               NETLINK_CB(cb->skb).portid,
5483                                               cb->nlh->nlmsg_seq,
5484                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5485                                 goto out;
5486 cont:
5487                         idx++;
5488                 }
5489         }
5490 out:
5491         rcu_read_unlock();
5492         cb->args[1] = idx;
5493         cb->args[0] = h;
5494
5495         return skb->len;
5496 }
5497
5498 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5499 {
5500         struct sk_buff *skb;
5501         struct net *net = dev_net(idev->dev);
5502         int err = -ENOBUFS;
5503
5504         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5505         if (!skb)
5506                 goto errout;
5507
5508         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5509         if (err < 0) {
5510                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5511                 WARN_ON(err == -EMSGSIZE);
5512                 kfree_skb(skb);
5513                 goto errout;
5514         }
5515         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5516         return;
5517 errout:
5518         if (err < 0)
5519                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5520 }
5521
5522 static inline size_t inet6_prefix_nlmsg_size(void)
5523 {
5524         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5525                + nla_total_size(sizeof(struct in6_addr))
5526                + nla_total_size(sizeof(struct prefix_cacheinfo));
5527 }
5528
5529 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5530                              struct prefix_info *pinfo, u32 portid, u32 seq,
5531                              int event, unsigned int flags)
5532 {
5533         struct prefixmsg *pmsg;
5534         struct nlmsghdr *nlh;
5535         struct prefix_cacheinfo ci;
5536
5537         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5538         if (!nlh)
5539                 return -EMSGSIZE;
5540
5541         pmsg = nlmsg_data(nlh);
5542         pmsg->prefix_family = AF_INET6;
5543         pmsg->prefix_pad1 = 0;
5544         pmsg->prefix_pad2 = 0;
5545         pmsg->prefix_ifindex = idev->dev->ifindex;
5546         pmsg->prefix_len = pinfo->prefix_len;
5547         pmsg->prefix_type = pinfo->type;
5548         pmsg->prefix_pad3 = 0;
5549         pmsg->prefix_flags = 0;
5550         if (pinfo->onlink)
5551                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5552         if (pinfo->autoconf)
5553                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5554
5555         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5556                 goto nla_put_failure;
5557         ci.preferred_time = ntohl(pinfo->prefered);
5558         ci.valid_time = ntohl(pinfo->valid);
5559         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5560                 goto nla_put_failure;
5561         nlmsg_end(skb, nlh);
5562         return 0;
5563
5564 nla_put_failure:
5565         nlmsg_cancel(skb, nlh);
5566         return -EMSGSIZE;
5567 }
5568
5569 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5570                          struct prefix_info *pinfo)
5571 {
5572         struct sk_buff *skb;
5573         struct net *net = dev_net(idev->dev);
5574         int err = -ENOBUFS;
5575
5576         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5577         if (!skb)
5578                 goto errout;
5579
5580         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5581         if (err < 0) {
5582                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5583                 WARN_ON(err == -EMSGSIZE);
5584                 kfree_skb(skb);
5585                 goto errout;
5586         }
5587         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5588         return;
5589 errout:
5590         if (err < 0)
5591                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5592 }
5593
5594 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5595 {
5596         struct net *net = dev_net(ifp->idev->dev);
5597
5598         if (event)
5599                 ASSERT_RTNL();
5600
5601         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5602
5603         switch (event) {
5604         case RTM_NEWADDR:
5605                 /*
5606                  * If the address was optimistic
5607                  * we inserted the route at the start of
5608                  * our DAD process, so we don't need
5609                  * to do it again
5610                  */
5611                 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5612                         ip6_ins_rt(net, ifp->rt);
5613                 if (ifp->idev->cnf.forwarding)
5614                         addrconf_join_anycast(ifp);
5615                 if (!ipv6_addr_any(&ifp->peer_addr))
5616                         addrconf_prefix_route(&ifp->peer_addr, 128,
5617                                               ifp->idev->dev, 0, 0);
5618                 break;
5619         case RTM_DELADDR:
5620                 if (ifp->idev->cnf.forwarding)
5621                         addrconf_leave_anycast(ifp);
5622                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5623                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5624                         struct rt6_info *rt;
5625
5626                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5627                                                        ifp->idev->dev, 0, 0);
5628                         if (rt)
5629                                 ip6_del_rt(net, rt);
5630                 }
5631                 if (ifp->rt) {
5632                         if (dst_hold_safe(&ifp->rt->dst))
5633                                 ip6_del_rt(net, ifp->rt);
5634                 }
5635                 rt_genid_bump_ipv6(net);
5636                 break;
5637         }
5638         atomic_inc(&net->ipv6.dev_addr_genid);
5639 }
5640
5641 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5642 {
5643         rcu_read_lock_bh();
5644         if (likely(ifp->idev->dead == 0))
5645                 __ipv6_ifa_notify(event, ifp);
5646         rcu_read_unlock_bh();
5647 }
5648
5649 #ifdef CONFIG_SYSCTL
5650
5651 static
5652 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5653                            void __user *buffer, size_t *lenp, loff_t *ppos)
5654 {
5655         int *valp = ctl->data;
5656         int val = *valp;
5657         loff_t pos = *ppos;
5658         struct ctl_table lctl;
5659         int ret;
5660
5661         /*
5662          * ctl->data points to idev->cnf.forwarding, we should
5663          * not modify it until we get the rtnl lock.
5664          */
5665         lctl = *ctl;
5666         lctl.data = &val;
5667
5668         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5669
5670         if (write)
5671                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5672         if (ret)
5673                 *ppos = pos;
5674         return ret;
5675 }
5676
5677 static
5678 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5679                         void __user *buffer, size_t *lenp, loff_t *ppos)
5680 {
5681         struct inet6_dev *idev = ctl->extra1;
5682         int min_mtu = IPV6_MIN_MTU;
5683         struct ctl_table lctl;
5684
5685         lctl = *ctl;
5686         lctl.extra1 = &min_mtu;
5687         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5688
5689         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5690 }
5691
5692 static void dev_disable_change(struct inet6_dev *idev)
5693 {
5694         struct netdev_notifier_info info;
5695
5696         if (!idev || !idev->dev)
5697                 return;
5698
5699         netdev_notifier_info_init(&info, idev->dev);
5700         if (idev->cnf.disable_ipv6)
5701                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5702         else
5703                 addrconf_notify(NULL, NETDEV_UP, &info);
5704 }
5705
5706 static void addrconf_disable_change(struct net *net, __s32 newf)
5707 {
5708         struct net_device *dev;
5709         struct inet6_dev *idev;
5710
5711         for_each_netdev(net, dev) {
5712                 idev = __in6_dev_get(dev);
5713                 if (idev) {
5714                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5715                         idev->cnf.disable_ipv6 = newf;
5716                         if (changed)
5717                                 dev_disable_change(idev);
5718                 }
5719         }
5720 }
5721
5722 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5723 {
5724         struct net *net;
5725         int old;
5726
5727         if (!rtnl_trylock())
5728                 return restart_syscall();
5729
5730         net = (struct net *)table->extra2;
5731         old = *p;
5732         *p = newf;
5733
5734         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5735                 rtnl_unlock();
5736                 return 0;
5737         }
5738
5739         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5740                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5741                 addrconf_disable_change(net, newf);
5742         } else if ((!newf) ^ (!old))
5743                 dev_disable_change((struct inet6_dev *)table->extra1);
5744
5745         rtnl_unlock();
5746         return 0;
5747 }
5748
5749 static
5750 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5751                             void __user *buffer, size_t *lenp, loff_t *ppos)
5752 {
5753         int *valp = ctl->data;
5754         int val = *valp;
5755         loff_t pos = *ppos;
5756         struct ctl_table lctl;
5757         int ret;
5758
5759         /*
5760          * ctl->data points to idev->cnf.disable_ipv6, we should
5761          * not modify it until we get the rtnl lock.
5762          */
5763         lctl = *ctl;
5764         lctl.data = &val;
5765
5766         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5767
5768         if (write)
5769                 ret = addrconf_disable_ipv6(ctl, valp, val);
5770         if (ret)
5771                 *ppos = pos;
5772         return ret;
5773 }
5774
5775 static
5776 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5777                               void __user *buffer, size_t *lenp, loff_t *ppos)
5778 {
5779         int *valp = ctl->data;
5780         int ret;
5781         int old, new;
5782
5783         old = *valp;
5784         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5785         new = *valp;
5786
5787         if (write && old != new) {
5788                 struct net *net = ctl->extra2;
5789
5790                 if (!rtnl_trylock())
5791                         return restart_syscall();
5792
5793                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5794                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5795                                                      NETCONFA_PROXY_NEIGH,
5796                                                      NETCONFA_IFINDEX_DEFAULT,
5797                                                      net->ipv6.devconf_dflt);
5798                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5799                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5800                                                      NETCONFA_PROXY_NEIGH,
5801                                                      NETCONFA_IFINDEX_ALL,
5802                                                      net->ipv6.devconf_all);
5803                 else {
5804                         struct inet6_dev *idev = ctl->extra1;
5805
5806                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5807                                                      NETCONFA_PROXY_NEIGH,
5808                                                      idev->dev->ifindex,
5809                                                      &idev->cnf);
5810                 }
5811                 rtnl_unlock();
5812         }
5813
5814         return ret;
5815 }
5816
5817 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5818                                          void __user *buffer, size_t *lenp,
5819                                          loff_t *ppos)
5820 {
5821         int ret = 0;
5822         int new_val;
5823         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5824         struct net *net = (struct net *)ctl->extra2;
5825
5826         if (!rtnl_trylock())
5827                 return restart_syscall();
5828
5829         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5830
5831         if (write) {
5832                 new_val = *((int *)ctl->data);
5833
5834                 if (check_addr_gen_mode(new_val) < 0) {
5835                         ret = -EINVAL;
5836                         goto out;
5837                 }
5838
5839                 /* request for default */
5840                 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5841                         ipv6_devconf_dflt.addr_gen_mode = new_val;
5842
5843                 /* request for individual net device */
5844                 } else {
5845                         if (!idev)
5846                                 goto out;
5847
5848                         if (check_stable_privacy(idev, net, new_val) < 0) {
5849                                 ret = -EINVAL;
5850                                 goto out;
5851                         }
5852
5853                         if (idev->cnf.addr_gen_mode != new_val) {
5854                                 idev->cnf.addr_gen_mode = new_val;
5855                                 addrconf_dev_config(idev->dev);
5856                         }
5857                 }
5858         }
5859
5860 out:
5861         rtnl_unlock();
5862
5863         return ret;
5864 }
5865
5866 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5867                                          void __user *buffer, size_t *lenp,
5868                                          loff_t *ppos)
5869 {
5870         int err;
5871         struct in6_addr addr;
5872         char str[IPV6_MAX_STRLEN];
5873         struct ctl_table lctl = *ctl;
5874         struct net *net = ctl->extra2;
5875         struct ipv6_stable_secret *secret = ctl->data;
5876
5877         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5878                 return -EIO;
5879
5880         lctl.maxlen = IPV6_MAX_STRLEN;
5881         lctl.data = str;
5882
5883         if (!rtnl_trylock())
5884                 return restart_syscall();
5885
5886         if (!write && !secret->initialized) {
5887                 err = -EIO;
5888                 goto out;
5889         }
5890
5891         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5892         if (err >= sizeof(str)) {
5893                 err = -EIO;
5894                 goto out;
5895         }
5896
5897         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5898         if (err || !write)
5899                 goto out;
5900
5901         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5902                 err = -EIO;
5903                 goto out;
5904         }
5905
5906         secret->initialized = true;
5907         secret->secret = addr;
5908
5909         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5910                 struct net_device *dev;
5911
5912                 for_each_netdev(net, dev) {
5913                         struct inet6_dev *idev = __in6_dev_get(dev);
5914
5915                         if (idev) {
5916                                 idev->cnf.addr_gen_mode =
5917                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5918                         }
5919                 }
5920         } else {
5921                 struct inet6_dev *idev = ctl->extra1;
5922
5923                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5924         }
5925
5926 out:
5927         rtnl_unlock();
5928
5929         return err;
5930 }
5931
5932 static
5933 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5934                                                 int write,
5935                                                 void __user *buffer,
5936                                                 size_t *lenp,
5937                                                 loff_t *ppos)
5938 {
5939         int *valp = ctl->data;
5940         int val = *valp;
5941         loff_t pos = *ppos;
5942         struct ctl_table lctl;
5943         int ret;
5944
5945         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5946          * we should not modify it until we get the rtnl lock.
5947          */
5948         lctl = *ctl;
5949         lctl.data = &val;
5950
5951         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5952
5953         if (write)
5954                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5955         if (ret)
5956                 *ppos = pos;
5957         return ret;
5958 }
5959
5960 static
5961 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5962 {
5963         if (rt) {
5964                 if (action)
5965                         rt->dst.flags |= DST_NOPOLICY;
5966                 else
5967                         rt->dst.flags &= ~DST_NOPOLICY;
5968         }
5969 }
5970
5971 static
5972 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5973 {
5974         struct inet6_ifaddr *ifa;
5975
5976         read_lock_bh(&idev->lock);
5977         list_for_each_entry(ifa, &idev->addr_list, if_list) {
5978                 spin_lock(&ifa->lock);
5979                 if (ifa->rt) {
5980                         struct rt6_info *rt = ifa->rt;
5981                         int cpu;
5982
5983                         rcu_read_lock();
5984                         ifa->rt->dst_nopolicy = val ? true : false;
5985                         if (rt->rt6i_pcpu) {
5986                                 for_each_possible_cpu(cpu) {
5987                                         struct rt6_info **rtp;
5988
5989                                         rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5990                                         addrconf_set_nopolicy(*rtp, val);
5991                                 }
5992                         }
5993                         rcu_read_unlock();
5994                 }
5995                 spin_unlock(&ifa->lock);
5996         }
5997         read_unlock_bh(&idev->lock);
5998 }
5999
6000 static
6001 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6002 {
6003         struct inet6_dev *idev;
6004         struct net *net;
6005
6006         if (!rtnl_trylock())
6007                 return restart_syscall();
6008
6009         *valp = val;
6010
6011         net = (struct net *)ctl->extra2;
6012         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6013                 rtnl_unlock();
6014                 return 0;
6015         }
6016
6017         if (valp == &net->ipv6.devconf_all->disable_policy)  {
6018                 struct net_device *dev;
6019
6020                 for_each_netdev(net, dev) {
6021                         idev = __in6_dev_get(dev);
6022                         if (idev)
6023                                 addrconf_disable_policy_idev(idev, val);
6024                 }
6025         } else {
6026                 idev = (struct inet6_dev *)ctl->extra1;
6027                 addrconf_disable_policy_idev(idev, val);
6028         }
6029
6030         rtnl_unlock();
6031         return 0;
6032 }
6033
6034 static
6035 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6036                                    void __user *buffer, size_t *lenp,
6037                                    loff_t *ppos)
6038 {
6039         int *valp = ctl->data;
6040         int val = *valp;
6041         loff_t pos = *ppos;
6042         struct ctl_table lctl;
6043         int ret;
6044
6045         lctl = *ctl;
6046         lctl.data = &val;
6047         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6048
6049         if (write && (*valp != val))
6050                 ret = addrconf_disable_policy(ctl, valp, val);
6051
6052         if (ret)
6053                 *ppos = pos;
6054
6055         return ret;
6056 }
6057
6058 static int minus_one = -1;
6059 static const int zero = 0;
6060 static const int one = 1;
6061 static const int two_five_five = 255;
6062
6063 static const struct ctl_table addrconf_sysctl[] = {
6064         {
6065                 .procname       = "forwarding",
6066                 .data           = &ipv6_devconf.forwarding,
6067                 .maxlen         = sizeof(int),
6068                 .mode           = 0644,
6069                 .proc_handler   = addrconf_sysctl_forward,
6070         },
6071         {
6072                 .procname       = "hop_limit",
6073                 .data           = &ipv6_devconf.hop_limit,
6074                 .maxlen         = sizeof(int),
6075                 .mode           = 0644,
6076                 .proc_handler   = proc_dointvec_minmax,
6077                 .extra1         = (void *)&one,
6078                 .extra2         = (void *)&two_five_five,
6079         },
6080         {
6081                 .procname       = "mtu",
6082                 .data           = &ipv6_devconf.mtu6,
6083                 .maxlen         = sizeof(int),
6084                 .mode           = 0644,
6085                 .proc_handler   = addrconf_sysctl_mtu,
6086         },
6087         {
6088                 .procname       = "accept_ra",
6089                 .data           = &ipv6_devconf.accept_ra,
6090                 .maxlen         = sizeof(int),
6091                 .mode           = 0644,
6092                 .proc_handler   = proc_dointvec,
6093         },
6094         {
6095                 .procname       = "accept_redirects",
6096                 .data           = &ipv6_devconf.accept_redirects,
6097                 .maxlen         = sizeof(int),
6098                 .mode           = 0644,
6099                 .proc_handler   = proc_dointvec,
6100         },
6101         {
6102                 .procname       = "autoconf",
6103                 .data           = &ipv6_devconf.autoconf,
6104                 .maxlen         = sizeof(int),
6105                 .mode           = 0644,
6106                 .proc_handler   = proc_dointvec,
6107         },
6108         {
6109                 .procname       = "dad_transmits",
6110                 .data           = &ipv6_devconf.dad_transmits,
6111                 .maxlen         = sizeof(int),
6112                 .mode           = 0644,
6113                 .proc_handler   = proc_dointvec,
6114         },
6115         {
6116                 .procname       = "router_solicitations",
6117                 .data           = &ipv6_devconf.rtr_solicits,
6118                 .maxlen         = sizeof(int),
6119                 .mode           = 0644,
6120                 .proc_handler   = proc_dointvec_minmax,
6121                 .extra1         = &minus_one,
6122         },
6123         {
6124                 .procname       = "router_solicitation_interval",
6125                 .data           = &ipv6_devconf.rtr_solicit_interval,
6126                 .maxlen         = sizeof(int),
6127                 .mode           = 0644,
6128                 .proc_handler   = proc_dointvec_jiffies,
6129         },
6130         {
6131                 .procname       = "router_solicitation_max_interval",
6132                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6133                 .maxlen         = sizeof(int),
6134                 .mode           = 0644,
6135                 .proc_handler   = proc_dointvec_jiffies,
6136         },
6137         {
6138                 .procname       = "router_solicitation_delay",
6139                 .data           = &ipv6_devconf.rtr_solicit_delay,
6140                 .maxlen         = sizeof(int),
6141                 .mode           = 0644,
6142                 .proc_handler   = proc_dointvec_jiffies,
6143         },
6144         {
6145                 .procname       = "force_mld_version",
6146                 .data           = &ipv6_devconf.force_mld_version,
6147                 .maxlen         = sizeof(int),
6148                 .mode           = 0644,
6149                 .proc_handler   = proc_dointvec,
6150         },
6151         {
6152                 .procname       = "mldv1_unsolicited_report_interval",
6153                 .data           =
6154                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6155                 .maxlen         = sizeof(int),
6156                 .mode           = 0644,
6157                 .proc_handler   = proc_dointvec_ms_jiffies,
6158         },
6159         {
6160                 .procname       = "mldv2_unsolicited_report_interval",
6161                 .data           =
6162                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6163                 .maxlen         = sizeof(int),
6164                 .mode           = 0644,
6165                 .proc_handler   = proc_dointvec_ms_jiffies,
6166         },
6167         {
6168                 .procname       = "use_tempaddr",
6169                 .data           = &ipv6_devconf.use_tempaddr,
6170                 .maxlen         = sizeof(int),
6171                 .mode           = 0644,
6172                 .proc_handler   = proc_dointvec,
6173         },
6174         {
6175                 .procname       = "temp_valid_lft",
6176                 .data           = &ipv6_devconf.temp_valid_lft,
6177                 .maxlen         = sizeof(int),
6178                 .mode           = 0644,
6179                 .proc_handler   = proc_dointvec,
6180         },
6181         {
6182                 .procname       = "temp_prefered_lft",
6183                 .data           = &ipv6_devconf.temp_prefered_lft,
6184                 .maxlen         = sizeof(int),
6185                 .mode           = 0644,
6186                 .proc_handler   = proc_dointvec,
6187         },
6188         {
6189                 .procname       = "regen_max_retry",
6190                 .data           = &ipv6_devconf.regen_max_retry,
6191                 .maxlen         = sizeof(int),
6192                 .mode           = 0644,
6193                 .proc_handler   = proc_dointvec,
6194         },
6195         {
6196                 .procname       = "max_desync_factor",
6197                 .data           = &ipv6_devconf.max_desync_factor,
6198                 .maxlen         = sizeof(int),
6199                 .mode           = 0644,
6200                 .proc_handler   = proc_dointvec,
6201         },
6202         {
6203                 .procname       = "max_addresses",
6204                 .data           = &ipv6_devconf.max_addresses,
6205                 .maxlen         = sizeof(int),
6206                 .mode           = 0644,
6207                 .proc_handler   = proc_dointvec,
6208         },
6209         {
6210                 .procname       = "accept_ra_defrtr",
6211                 .data           = &ipv6_devconf.accept_ra_defrtr,
6212                 .maxlen         = sizeof(int),
6213                 .mode           = 0644,
6214                 .proc_handler   = proc_dointvec,
6215         },
6216         {
6217                 .procname       = "accept_ra_min_hop_limit",
6218                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6219                 .maxlen         = sizeof(int),
6220                 .mode           = 0644,
6221                 .proc_handler   = proc_dointvec,
6222         },
6223         {
6224                 .procname       = "accept_ra_pinfo",
6225                 .data           = &ipv6_devconf.accept_ra_pinfo,
6226                 .maxlen         = sizeof(int),
6227                 .mode           = 0644,
6228                 .proc_handler   = proc_dointvec,
6229         },
6230 #ifdef CONFIG_IPV6_ROUTER_PREF
6231         {
6232                 .procname       = "accept_ra_rtr_pref",
6233                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6234                 .maxlen         = sizeof(int),
6235                 .mode           = 0644,
6236                 .proc_handler   = proc_dointvec,
6237         },
6238         {
6239                 .procname       = "router_probe_interval",
6240                 .data           = &ipv6_devconf.rtr_probe_interval,
6241                 .maxlen         = sizeof(int),
6242                 .mode           = 0644,
6243                 .proc_handler   = proc_dointvec_jiffies,
6244         },
6245 #ifdef CONFIG_IPV6_ROUTE_INFO
6246         {
6247                 .procname       = "accept_ra_rt_info_min_plen",
6248                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6249                 .maxlen         = sizeof(int),
6250                 .mode           = 0644,
6251                 .proc_handler   = proc_dointvec,
6252         },
6253         {
6254                 .procname       = "accept_ra_rt_info_max_plen",
6255                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6256                 .maxlen         = sizeof(int),
6257                 .mode           = 0644,
6258                 .proc_handler   = proc_dointvec,
6259         },
6260 #endif
6261 #endif
6262         {
6263                 .procname       = "proxy_ndp",
6264                 .data           = &ipv6_devconf.proxy_ndp,
6265                 .maxlen         = sizeof(int),
6266                 .mode           = 0644,
6267                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6268         },
6269         {
6270                 .procname       = "accept_source_route",
6271                 .data           = &ipv6_devconf.accept_source_route,
6272                 .maxlen         = sizeof(int),
6273                 .mode           = 0644,
6274                 .proc_handler   = proc_dointvec,
6275         },
6276 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6277         {
6278                 .procname       = "optimistic_dad",
6279                 .data           = &ipv6_devconf.optimistic_dad,
6280                 .maxlen         = sizeof(int),
6281                 .mode           = 0644,
6282                 .proc_handler   = proc_dointvec,
6283         },
6284         {
6285                 .procname       = "use_optimistic",
6286                 .data           = &ipv6_devconf.use_optimistic,
6287                 .maxlen         = sizeof(int),
6288                 .mode           = 0644,
6289                 .proc_handler   = proc_dointvec,
6290         },
6291 #endif
6292 #ifdef CONFIG_IPV6_MROUTE
6293         {
6294                 .procname       = "mc_forwarding",
6295                 .data           = &ipv6_devconf.mc_forwarding,
6296                 .maxlen         = sizeof(int),
6297                 .mode           = 0444,
6298                 .proc_handler   = proc_dointvec,
6299         },
6300 #endif
6301         {
6302                 .procname       = "disable_ipv6",
6303                 .data           = &ipv6_devconf.disable_ipv6,
6304                 .maxlen         = sizeof(int),
6305                 .mode           = 0644,
6306                 .proc_handler   = addrconf_sysctl_disable,
6307         },
6308         {
6309                 .procname       = "accept_dad",
6310                 .data           = &ipv6_devconf.accept_dad,
6311                 .maxlen         = sizeof(int),
6312                 .mode           = 0644,
6313                 .proc_handler   = proc_dointvec,
6314         },
6315         {
6316                 .procname       = "force_tllao",
6317                 .data           = &ipv6_devconf.force_tllao,
6318                 .maxlen         = sizeof(int),
6319                 .mode           = 0644,
6320                 .proc_handler   = proc_dointvec
6321         },
6322         {
6323                 .procname       = "ndisc_notify",
6324                 .data           = &ipv6_devconf.ndisc_notify,
6325                 .maxlen         = sizeof(int),
6326                 .mode           = 0644,
6327                 .proc_handler   = proc_dointvec
6328         },
6329         {
6330                 .procname       = "suppress_frag_ndisc",
6331                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6332                 .maxlen         = sizeof(int),
6333                 .mode           = 0644,
6334                 .proc_handler   = proc_dointvec
6335         },
6336         {
6337                 .procname       = "accept_ra_from_local",
6338                 .data           = &ipv6_devconf.accept_ra_from_local,
6339                 .maxlen         = sizeof(int),
6340                 .mode           = 0644,
6341                 .proc_handler   = proc_dointvec,
6342         },
6343         {
6344                 .procname       = "accept_ra_mtu",
6345                 .data           = &ipv6_devconf.accept_ra_mtu,
6346                 .maxlen         = sizeof(int),
6347                 .mode           = 0644,
6348                 .proc_handler   = proc_dointvec,
6349         },
6350         {
6351                 .procname       = "stable_secret",
6352                 .data           = &ipv6_devconf.stable_secret,
6353                 .maxlen         = IPV6_MAX_STRLEN,
6354                 .mode           = 0600,
6355                 .proc_handler   = addrconf_sysctl_stable_secret,
6356         },
6357         {
6358                 .procname       = "use_oif_addrs_only",
6359                 .data           = &ipv6_devconf.use_oif_addrs_only,
6360                 .maxlen         = sizeof(int),
6361                 .mode           = 0644,
6362                 .proc_handler   = proc_dointvec,
6363         },
6364         {
6365                 .procname       = "ignore_routes_with_linkdown",
6366                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6367                 .maxlen         = sizeof(int),
6368                 .mode           = 0644,
6369                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6370         },
6371         {
6372                 .procname       = "drop_unicast_in_l2_multicast",
6373                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6374                 .maxlen         = sizeof(int),
6375                 .mode           = 0644,
6376                 .proc_handler   = proc_dointvec,
6377         },
6378         {
6379                 .procname       = "drop_unsolicited_na",
6380                 .data           = &ipv6_devconf.drop_unsolicited_na,
6381                 .maxlen         = sizeof(int),
6382                 .mode           = 0644,
6383                 .proc_handler   = proc_dointvec,
6384         },
6385         {
6386                 .procname       = "keep_addr_on_down",
6387                 .data           = &ipv6_devconf.keep_addr_on_down,
6388                 .maxlen         = sizeof(int),
6389                 .mode           = 0644,
6390                 .proc_handler   = proc_dointvec,
6391
6392         },
6393         {
6394                 .procname       = "seg6_enabled",
6395                 .data           = &ipv6_devconf.seg6_enabled,
6396                 .maxlen         = sizeof(int),
6397                 .mode           = 0644,
6398                 .proc_handler   = proc_dointvec,
6399         },
6400 #ifdef CONFIG_IPV6_SEG6_HMAC
6401         {
6402                 .procname       = "seg6_require_hmac",
6403                 .data           = &ipv6_devconf.seg6_require_hmac,
6404                 .maxlen         = sizeof(int),
6405                 .mode           = 0644,
6406                 .proc_handler   = proc_dointvec,
6407         },
6408 #endif
6409         {
6410                 .procname       = "enhanced_dad",
6411                 .data           = &ipv6_devconf.enhanced_dad,
6412                 .maxlen         = sizeof(int),
6413                 .mode           = 0644,
6414                 .proc_handler   = proc_dointvec,
6415         },
6416         {
6417                 .procname               = "addr_gen_mode",
6418                 .data                   = &ipv6_devconf.addr_gen_mode,
6419                 .maxlen                 = sizeof(int),
6420                 .mode                   = 0644,
6421                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6422         },
6423         {
6424                 .procname       = "disable_policy",
6425                 .data           = &ipv6_devconf.disable_policy,
6426                 .maxlen         = sizeof(int),
6427                 .mode           = 0644,
6428                 .proc_handler   = addrconf_sysctl_disable_policy,
6429         },
6430         {
6431                 .procname       = "ndisc_tclass",
6432                 .data           = &ipv6_devconf.ndisc_tclass,
6433                 .maxlen         = sizeof(int),
6434                 .mode           = 0644,
6435                 .proc_handler   = proc_dointvec_minmax,
6436                 .extra1         = (void *)&zero,
6437                 .extra2         = (void *)&two_five_five,
6438         },
6439         {
6440                 /* sentinel */
6441         }
6442 };
6443
6444 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6445                 struct inet6_dev *idev, struct ipv6_devconf *p)
6446 {
6447         int i, ifindex;
6448         struct ctl_table *table;
6449         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6450
6451         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6452         if (!table)
6453                 goto out;
6454
6455         for (i = 0; table[i].data; i++) {
6456                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6457                 /* If one of these is already set, then it is not safe to
6458                  * overwrite either of them: this makes proc_dointvec_minmax
6459                  * usable.
6460                  */
6461                 if (!table[i].extra1 && !table[i].extra2) {
6462                         table[i].extra1 = idev; /* embedded; no ref */
6463                         table[i].extra2 = net;
6464                 }
6465         }
6466
6467         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6468
6469         p->sysctl_header = register_net_sysctl(net, path, table);
6470         if (!p->sysctl_header)
6471                 goto free;
6472
6473         if (!strcmp(dev_name, "all"))
6474                 ifindex = NETCONFA_IFINDEX_ALL;
6475         else if (!strcmp(dev_name, "default"))
6476                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6477         else
6478                 ifindex = idev->dev->ifindex;
6479         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6480                                      ifindex, p);
6481         return 0;
6482
6483 free:
6484         kfree(table);
6485 out:
6486         return -ENOBUFS;
6487 }
6488
6489 static void __addrconf_sysctl_unregister(struct net *net,
6490                                          struct ipv6_devconf *p, int ifindex)
6491 {
6492         struct ctl_table *table;
6493
6494         if (!p->sysctl_header)
6495                 return;
6496
6497         table = p->sysctl_header->ctl_table_arg;
6498         unregister_net_sysctl_table(p->sysctl_header);
6499         p->sysctl_header = NULL;
6500         kfree(table);
6501
6502         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6503 }
6504
6505 static int addrconf_sysctl_register(struct inet6_dev *idev)
6506 {
6507         int err;
6508
6509         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6510                 return -EINVAL;
6511
6512         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6513                                     &ndisc_ifinfo_sysctl_change);
6514         if (err)
6515                 return err;
6516         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6517                                          idev, &idev->cnf);
6518         if (err)
6519                 neigh_sysctl_unregister(idev->nd_parms);
6520
6521         return err;
6522 }
6523
6524 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6525 {
6526         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6527                                      idev->dev->ifindex);
6528         neigh_sysctl_unregister(idev->nd_parms);
6529 }
6530
6531
6532 #endif
6533
6534 static int __net_init addrconf_init_net(struct net *net)
6535 {
6536         int err = -ENOMEM;
6537         struct ipv6_devconf *all, *dflt;
6538
6539         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6540         if (!all)
6541                 goto err_alloc_all;
6542
6543         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6544         if (!dflt)
6545                 goto err_alloc_dflt;
6546
6547         /* these will be inherited by all namespaces */
6548         dflt->autoconf = ipv6_defaults.autoconf;
6549         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6550
6551         dflt->stable_secret.initialized = false;
6552         all->stable_secret.initialized = false;
6553
6554         net->ipv6.devconf_all = all;
6555         net->ipv6.devconf_dflt = dflt;
6556
6557 #ifdef CONFIG_SYSCTL
6558         err = __addrconf_sysctl_register(net, "all", NULL, all);
6559         if (err < 0)
6560                 goto err_reg_all;
6561
6562         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6563         if (err < 0)
6564                 goto err_reg_dflt;
6565 #endif
6566         return 0;
6567
6568 #ifdef CONFIG_SYSCTL
6569 err_reg_dflt:
6570         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6571 err_reg_all:
6572         kfree(dflt);
6573 #endif
6574 err_alloc_dflt:
6575         kfree(all);
6576 err_alloc_all:
6577         return err;
6578 }
6579
6580 static void __net_exit addrconf_exit_net(struct net *net)
6581 {
6582 #ifdef CONFIG_SYSCTL
6583         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6584                                      NETCONFA_IFINDEX_DEFAULT);
6585         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6586                                      NETCONFA_IFINDEX_ALL);
6587 #endif
6588         kfree(net->ipv6.devconf_dflt);
6589         kfree(net->ipv6.devconf_all);
6590 }
6591
6592 static struct pernet_operations addrconf_ops = {
6593         .init = addrconf_init_net,
6594         .exit = addrconf_exit_net,
6595 };
6596
6597 static struct rtnl_af_ops inet6_ops __read_mostly = {
6598         .family           = AF_INET6,
6599         .fill_link_af     = inet6_fill_link_af,
6600         .get_link_af_size = inet6_get_link_af_size,
6601         .validate_link_af = inet6_validate_link_af,
6602         .set_link_af      = inet6_set_link_af,
6603 };
6604
6605 /*
6606  *      Init / cleanup code
6607  */
6608
6609 int __init addrconf_init(void)
6610 {
6611         struct inet6_dev *idev;
6612         int i, err;
6613
6614         err = ipv6_addr_label_init();
6615         if (err < 0) {
6616                 pr_crit("%s: cannot initialize default policy table: %d\n",
6617                         __func__, err);
6618                 goto out;
6619         }
6620
6621         err = register_pernet_subsys(&addrconf_ops);
6622         if (err < 0)
6623                 goto out_addrlabel;
6624
6625         addrconf_wq = create_workqueue("ipv6_addrconf");
6626         if (!addrconf_wq) {
6627                 err = -ENOMEM;
6628                 goto out_nowq;
6629         }
6630
6631         /* The addrconf netdev notifier requires that loopback_dev
6632          * has it's ipv6 private information allocated and setup
6633          * before it can bring up and give link-local addresses
6634          * to other devices which are up.
6635          *
6636          * Unfortunately, loopback_dev is not necessarily the first
6637          * entry in the global dev_base list of net devices.  In fact,
6638          * it is likely to be the very last entry on that list.
6639          * So this causes the notifier registry below to try and
6640          * give link-local addresses to all devices besides loopback_dev
6641          * first, then loopback_dev, which cases all the non-loopback_dev
6642          * devices to fail to get a link-local address.
6643          *
6644          * So, as a temporary fix, allocate the ipv6 structure for
6645          * loopback_dev first by hand.
6646          * Longer term, all of the dependencies ipv6 has upon the loopback
6647          * device and it being up should be removed.
6648          */
6649         rtnl_lock();
6650         idev = ipv6_add_dev(init_net.loopback_dev);
6651         rtnl_unlock();
6652         if (IS_ERR(idev)) {
6653                 err = PTR_ERR(idev);
6654                 goto errlo;
6655         }
6656
6657         ip6_route_init_special_entries();
6658
6659         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6660                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6661
6662         register_netdevice_notifier(&ipv6_dev_notf);
6663
6664         addrconf_verify();
6665
6666         rtnl_af_register(&inet6_ops);
6667
6668         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6669                                    NULL, inet6_dump_ifinfo, 0);
6670         if (err < 0)
6671                 goto errout;
6672
6673         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6674                                    inet6_rtm_newaddr, NULL, 0);
6675         if (err < 0)
6676                 goto errout;
6677         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6678                                    inet6_rtm_deladdr, NULL, 0);
6679         if (err < 0)
6680                 goto errout;
6681         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6682                                    inet6_rtm_getaddr, inet6_dump_ifaddr,
6683                                    RTNL_FLAG_DOIT_UNLOCKED);
6684         if (err < 0)
6685                 goto errout;
6686         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6687                                    NULL, inet6_dump_ifmcaddr, 0);
6688         if (err < 0)
6689                 goto errout;
6690         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6691                                    NULL, inet6_dump_ifacaddr, 0);
6692         if (err < 0)
6693                 goto errout;
6694         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6695                                    inet6_netconf_get_devconf,
6696                                    inet6_netconf_dump_devconf,
6697                                    RTNL_FLAG_DOIT_UNLOCKED);
6698         if (err < 0)
6699                 goto errout;
6700         err = ipv6_addr_label_rtnl_register();
6701         if (err < 0)
6702                 goto errout;
6703
6704         return 0;
6705 errout:
6706         rtnl_unregister_all(PF_INET6);
6707         rtnl_af_unregister(&inet6_ops);
6708         unregister_netdevice_notifier(&ipv6_dev_notf);
6709 errlo:
6710         destroy_workqueue(addrconf_wq);
6711 out_nowq:
6712         unregister_pernet_subsys(&addrconf_ops);
6713 out_addrlabel:
6714         ipv6_addr_label_cleanup();
6715 out:
6716         return err;
6717 }
6718
6719 void addrconf_cleanup(void)
6720 {
6721         struct net_device *dev;
6722         int i;
6723
6724         unregister_netdevice_notifier(&ipv6_dev_notf);
6725         unregister_pernet_subsys(&addrconf_ops);
6726         ipv6_addr_label_cleanup();
6727
6728         rtnl_af_unregister(&inet6_ops);
6729
6730         rtnl_lock();
6731
6732         /* clean dev list */
6733         for_each_netdev(&init_net, dev) {
6734                 if (__in6_dev_get(dev) == NULL)
6735                         continue;
6736                 addrconf_ifdown(dev, 1);
6737         }
6738         addrconf_ifdown(init_net.loopback_dev, 2);
6739
6740         /*
6741          *      Check hash table.
6742          */
6743         spin_lock_bh(&addrconf_hash_lock);
6744         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6745                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6746         spin_unlock_bh(&addrconf_hash_lock);
6747         cancel_delayed_work(&addr_chk_work);
6748         rtnl_unlock();
6749
6750         destroy_workqueue(addrconf_wq);
6751 }