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 fib6_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
 920         kfree_rcu(ifp, rcu);
 921 }
 922
 923 static void
 924 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 925 {
 926         struct list_head *p;
 927         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 928
 929         /*
 930          * Each device address list is sorted in order of scope -
 931          * global before linklocal.
 932          */
 933         list_for_each(p, &idev->addr_list) {
 934                 struct inet6_ifaddr *ifa
 935                         = list_entry(p, struct inet6_ifaddr, if_list);
 936                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 937                         break;
 938         }
 939
 940         list_add_tail_rcu(&ifp->if_list, p);
 941 }
 942
 943 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
 944 {
 945         u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
 946
 947         return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
 948 }
 949
 950 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 951                                struct net_device *dev, unsigned int hash)
 952 {
 953         struct inet6_ifaddr *ifp;
 954
 955         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
 956                 if (!net_eq(dev_net(ifp->idev->dev), net))
 957                         continue;
 958                 if (ipv6_addr_equal(&ifp->addr, addr)) {
 959                         if (!dev || ifp->idev->dev == dev)
 960                                 return true;
 961                 }
 962         }
 963         return false;
 964 }
 965
 966 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
 967 {
 968         unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
 969         int err = 0;
 970
 971         spin_lock(&addrconf_hash_lock);
 972
 973         /* Ignore adding duplicate addresses on an interface */
 974         if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
 975                 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
 976                 err = -EEXIST;
 977         } else {
 978                 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 979         }
 980
 981         spin_unlock(&addrconf_hash_lock);
 982
 983         return err;
 984 }
 985
 986 /* On success it returns ifp with increased reference count */
 987
 988 static struct inet6_ifaddr *
 989 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 990               const struct in6_addr *peer_addr, int pfxlen,
 991               int scope, u32 flags, u32 valid_lft, u32 prefered_lft,
 992               bool can_block, struct netlink_ext_ack *extack)
 993 {
 994         gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
 995         struct net *net = dev_net(idev->dev);
 996         struct inet6_ifaddr *ifa = NULL;
 997         struct fib6_info *f6i = NULL;
 998         int err = 0;
 999         int addr_type = ipv6_addr_type(addr);
1000
1001         if (addr_type == IPV6_ADDR_ANY ||
1002             addr_type & IPV6_ADDR_MULTICAST ||
1003             (!(idev->dev->flags & IFF_LOOPBACK) &&
1004              addr_type & IPV6_ADDR_LOOPBACK))
1005                 return ERR_PTR(-EADDRNOTAVAIL);
1006
1007         if (idev->dead) {
1008                 err = -ENODEV;                  /*XXX*/
1009                 goto out;
1010         }
1011
1012         if (idev->cnf.disable_ipv6) {
1013                 err = -EACCES;
1014                 goto out;
1015         }
1016
1017         /* validator notifier needs to be blocking;
1018          * do not call in atomic context
1019          */
1020         if (can_block) {
1021                 struct in6_validator_info i6vi = {
1022                         .i6vi_addr = *addr,
1023                         .i6vi_dev = idev,
1024                         .extack = extack,
1025                 };
1026
1027                 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1028                 err = notifier_to_errno(err);
1029                 if (err < 0)
1030                         goto out;
1031         }
1032
1033         ifa = kzalloc(sizeof(*ifa), gfp_flags);
1034         if (!ifa) {
1035                 err = -ENOBUFS;
1036                 goto out;
1037         }
1038
1039         f6i = addrconf_f6i_alloc(net, idev, addr, false, gfp_flags);
1040         if (IS_ERR(f6i)) {
1041                 err = PTR_ERR(f6i);
1042                 f6i = NULL;
1043                 goto out;
1044         }
1045
1046         if (net->ipv6.devconf_all->disable_policy ||
1047             idev->cnf.disable_policy)
1048                 f6i->dst_nopolicy = true;
1049
1050         neigh_parms_data_state_setall(idev->nd_parms);
1051
1052         ifa->addr = *addr;
1053         if (peer_addr)
1054                 ifa->peer_addr = *peer_addr;
1055
1056         spin_lock_init(&ifa->lock);
1057         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1058         INIT_HLIST_NODE(&ifa->addr_lst);
1059         ifa->scope = scope;
1060         ifa->prefix_len = pfxlen;
1061         ifa->flags = flags;
1062         /* No need to add the TENTATIVE flag for addresses with NODAD */
1063         if (!(flags & IFA_F_NODAD))
1064                 ifa->flags |= IFA_F_TENTATIVE;
1065         ifa->valid_lft = valid_lft;
1066         ifa->prefered_lft = prefered_lft;
1067         ifa->cstamp = ifa->tstamp = jiffies;
1068         ifa->tokenized = false;
1069
1070         ifa->rt = f6i;
1071
1072         ifa->idev = idev;
1073         in6_dev_hold(idev);
1074
1075         /* For caller */
1076         refcount_set(&ifa->refcnt, 1);
1077
1078         rcu_read_lock_bh();
1079
1080         err = ipv6_add_addr_hash(idev->dev, ifa);
1081         if (err < 0) {
1082                 rcu_read_unlock_bh();
1083                 goto out;
1084         }
1085
1086         write_lock(&idev->lock);
1087
1088         /* Add to inet6_dev unicast addr list. */
1089         ipv6_link_dev_addr(idev, ifa);
1090
1091         if (ifa->flags&IFA_F_TEMPORARY) {
1092                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1093                 in6_ifa_hold(ifa);
1094         }
1095
1096         in6_ifa_hold(ifa);
1097         write_unlock(&idev->lock);
1098
1099         rcu_read_unlock_bh();
1100
1101         inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1102 out:
1103         if (unlikely(err < 0)) {
1104                 fib6_info_release(f6i);
1105
1106                 if (ifa) {
1107                         if (ifa->idev)
1108                                 in6_dev_put(ifa->idev);
1109                         kfree(ifa);
1110                 }
1111                 ifa = ERR_PTR(err);
1112         }
1113
1114         return ifa;
1115 }
1116
1117 enum cleanup_prefix_rt_t {
1118         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1119         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1120         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1121 };
1122
1123 /*
1124  * Check, whether the prefix for ifp would still need a prefix route
1125  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1126  * constants.
1127  *
1128  * 1) we don't purge prefix if address was not permanent.
1129  *    prefix is managed by its own lifetime.
1130  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1131  * 3) if there are no addresses, delete prefix.
1132  * 4) if there are still other permanent address(es),
1133  *    corresponding prefix is still permanent.
1134  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1135  *    don't purge the prefix, assume user space is managing it.
1136  * 6) otherwise, update prefix lifetime to the
1137  *    longest valid lifetime among the corresponding
1138  *    addresses on the device.
1139  *    Note: subsequent RA will update lifetime.
1140  **/
1141 static enum cleanup_prefix_rt_t
1142 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1143 {
1144         struct inet6_ifaddr *ifa;
1145         struct inet6_dev *idev = ifp->idev;
1146         unsigned long lifetime;
1147         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1148
1149         *expires = jiffies;
1150
1151         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1152                 if (ifa == ifp)
1153                         continue;
1154                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1155                                        ifp->prefix_len))
1156                         continue;
1157                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1158                         return CLEANUP_PREFIX_RT_NOP;
1159
1160                 action = CLEANUP_PREFIX_RT_EXPIRE;
1161
1162                 spin_lock(&ifa->lock);
1163
1164                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1165                 /*
1166                  * Note: Because this address is
1167                  * not permanent, lifetime <
1168                  * LONG_MAX / HZ here.
1169                  */
1170                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1171                         *expires = ifa->tstamp + lifetime * HZ;
1172                 spin_unlock(&ifa->lock);
1173         }
1174
1175         return action;
1176 }
1177
1178 static void
1179 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1180 {
1181         struct fib6_info *f6i;
1182
1183         f6i = addrconf_get_prefix_route(&ifp->addr,
1184                                        ifp->prefix_len,
1185                                        ifp->idev->dev,
1186                                        0, RTF_GATEWAY | RTF_DEFAULT);
1187         if (f6i) {
1188                 if (del_rt)
1189                         ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1190                 else {
1191                         if (!(f6i->fib6_flags & RTF_EXPIRES))
1192                                 fib6_set_expires(f6i, expires);
1193                         fib6_info_release(f6i);
1194                 }
1195         }
1196 }
1197
1198
1199 /* This function wants to get referenced ifp and releases it before return */
1200
1201 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1202 {
1203         int state;
1204         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1205         unsigned long expires;
1206
1207         ASSERT_RTNL();
1208
1209         spin_lock_bh(&ifp->lock);
1210         state = ifp->state;
1211         ifp->state = INET6_IFADDR_STATE_DEAD;
1212         spin_unlock_bh(&ifp->lock);
1213
1214         if (state == INET6_IFADDR_STATE_DEAD)
1215                 goto out;
1216
1217         spin_lock_bh(&addrconf_hash_lock);
1218         hlist_del_init_rcu(&ifp->addr_lst);
1219         spin_unlock_bh(&addrconf_hash_lock);
1220
1221         write_lock_bh(&ifp->idev->lock);
1222
1223         if (ifp->flags&IFA_F_TEMPORARY) {
1224                 list_del(&ifp->tmp_list);
1225                 if (ifp->ifpub) {
1226                         in6_ifa_put(ifp->ifpub);
1227                         ifp->ifpub = NULL;
1228                 }
1229                 __in6_ifa_put(ifp);
1230         }
1231
1232         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1233                 action = check_cleanup_prefix_route(ifp, &expires);
1234
1235         list_del_rcu(&ifp->if_list);
1236         __in6_ifa_put(ifp);
1237
1238         write_unlock_bh(&ifp->idev->lock);
1239
1240         addrconf_del_dad_work(ifp);
1241
1242         ipv6_ifa_notify(RTM_DELADDR, ifp);
1243
1244         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1245
1246         if (action != CLEANUP_PREFIX_RT_NOP) {
1247                 cleanup_prefix_route(ifp, expires,
1248                         action == CLEANUP_PREFIX_RT_DEL);
1249         }
1250
1251         /* clean up prefsrc entries */
1252         rt6_remove_prefsrc(ifp);
1253 out:
1254         in6_ifa_put(ifp);
1255 }
1256
1257 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1258                                 struct inet6_ifaddr *ift,
1259                                 bool block)
1260 {
1261         struct inet6_dev *idev = ifp->idev;
1262         struct in6_addr addr, *tmpaddr;
1263         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1264         unsigned long regen_advance;
1265         int tmp_plen;
1266         int ret = 0;
1267         u32 addr_flags;
1268         unsigned long now = jiffies;
1269         long max_desync_factor;
1270         s32 cnf_temp_preferred_lft;
1271
1272         write_lock_bh(&idev->lock);
1273         if (ift) {
1274                 spin_lock_bh(&ift->lock);
1275                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1276                 spin_unlock_bh(&ift->lock);
1277                 tmpaddr = &addr;
1278         } else {
1279                 tmpaddr = NULL;
1280         }
1281 retry:
1282         in6_dev_hold(idev);
1283         if (idev->cnf.use_tempaddr <= 0) {
1284                 write_unlock_bh(&idev->lock);
1285                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1286                 in6_dev_put(idev);
1287                 ret = -1;
1288                 goto out;
1289         }
1290         spin_lock_bh(&ifp->lock);
1291         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1292                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1293                 spin_unlock_bh(&ifp->lock);
1294                 write_unlock_bh(&idev->lock);
1295                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1296                         __func__);
1297                 in6_dev_put(idev);
1298                 ret = -1;
1299                 goto out;
1300         }
1301         in6_ifa_hold(ifp);
1302         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1303         ipv6_try_regen_rndid(idev, tmpaddr);
1304         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1305         age = (now - ifp->tstamp) / HZ;
1306
1307         regen_advance = idev->cnf.regen_max_retry *
1308                         idev->cnf.dad_transmits *
1309                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1310
1311         /* recalculate max_desync_factor each time and update
1312          * idev->desync_factor if it's larger
1313          */
1314         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1315         max_desync_factor = min_t(__u32,
1316                                   idev->cnf.max_desync_factor,
1317                                   cnf_temp_preferred_lft - regen_advance);
1318
1319         if (unlikely(idev->desync_factor > max_desync_factor)) {
1320                 if (max_desync_factor > 0) {
1321                         get_random_bytes(&idev->desync_factor,
1322                                          sizeof(idev->desync_factor));
1323                         idev->desync_factor %= max_desync_factor;
1324                 } else {
1325                         idev->desync_factor = 0;
1326                 }
1327         }
1328
1329         tmp_valid_lft = min_t(__u32,
1330                               ifp->valid_lft,
1331                               idev->cnf.temp_valid_lft + age);
1332         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1333                             idev->desync_factor;
1334         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1335         tmp_plen = ifp->prefix_len;
1336         tmp_tstamp = ifp->tstamp;
1337         spin_unlock_bh(&ifp->lock);
1338
1339         write_unlock_bh(&idev->lock);
1340
1341         /* A temporary address is created only if this calculated Preferred
1342          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1343          * an implementation must not create a temporary address with a zero
1344          * Preferred Lifetime.
1345          * Use age calculation as in addrconf_verify to avoid unnecessary
1346          * temporary addresses being generated.
1347          */
1348         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1349         if (tmp_prefered_lft <= regen_advance + age) {
1350                 in6_ifa_put(ifp);
1351                 in6_dev_put(idev);
1352                 ret = -1;
1353                 goto out;
1354         }
1355
1356         addr_flags = IFA_F_TEMPORARY;
1357         /* set in addrconf_prefix_rcv() */
1358         if (ifp->flags & IFA_F_OPTIMISTIC)
1359                 addr_flags |= IFA_F_OPTIMISTIC;
1360
1361         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1362                             ipv6_addr_scope(&addr), addr_flags,
1363                             tmp_valid_lft, tmp_prefered_lft, block, NULL);
1364         if (IS_ERR(ift)) {
1365                 in6_ifa_put(ifp);
1366                 in6_dev_put(idev);
1367                 pr_info("%s: retry temporary address regeneration\n", __func__);
1368                 tmpaddr = &addr;
1369                 write_lock_bh(&idev->lock);
1370                 goto retry;
1371         }
1372
1373         spin_lock_bh(&ift->lock);
1374         ift->ifpub = ifp;
1375         ift->cstamp = now;
1376         ift->tstamp = tmp_tstamp;
1377         spin_unlock_bh(&ift->lock);
1378
1379         addrconf_dad_start(ift);
1380         in6_ifa_put(ift);
1381         in6_dev_put(idev);
1382 out:
1383         return ret;
1384 }
1385
1386 /*
1387  *      Choose an appropriate source address (RFC3484)
1388  */
1389 enum {
1390         IPV6_SADDR_RULE_INIT = 0,
1391         IPV6_SADDR_RULE_LOCAL,
1392         IPV6_SADDR_RULE_SCOPE,
1393         IPV6_SADDR_RULE_PREFERRED,
1394 #ifdef CONFIG_IPV6_MIP6
1395         IPV6_SADDR_RULE_HOA,
1396 #endif
1397         IPV6_SADDR_RULE_OIF,
1398         IPV6_SADDR_RULE_LABEL,
1399         IPV6_SADDR_RULE_PRIVACY,
1400         IPV6_SADDR_RULE_ORCHID,
1401         IPV6_SADDR_RULE_PREFIX,
1402 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1403         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1404 #endif
1405         IPV6_SADDR_RULE_MAX
1406 };
1407
1408 struct ipv6_saddr_score {
1409         int                     rule;
1410         int                     addr_type;
1411         struct inet6_ifaddr     *ifa;
1412         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1413         int                     scopedist;
1414         int                     matchlen;
1415 };
1416
1417 struct ipv6_saddr_dst {
1418         const struct in6_addr *addr;
1419         int ifindex;
1420         int scope;
1421         int label;
1422         unsigned int prefs;
1423 };
1424
1425 static inline int ipv6_saddr_preferred(int type)
1426 {
1427         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1428                 return 1;
1429         return 0;
1430 }
1431
1432 static bool ipv6_use_optimistic_addr(struct net *net,
1433                                      struct inet6_dev *idev)
1434 {
1435 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1436         if (!idev)
1437                 return false;
1438         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1439                 return false;
1440         if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1441                 return false;
1442
1443         return true;
1444 #else
1445         return false;
1446 #endif
1447 }
1448
1449 static bool ipv6_allow_optimistic_dad(struct net *net,
1450                                       struct inet6_dev *idev)
1451 {
1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1453         if (!idev)
1454                 return false;
1455         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1456                 return false;
1457
1458         return true;
1459 #else
1460         return false;
1461 #endif
1462 }
1463
1464 static int ipv6_get_saddr_eval(struct net *net,
1465                                struct ipv6_saddr_score *score,
1466                                struct ipv6_saddr_dst *dst,
1467                                int i)
1468 {
1469         int ret;
1470
1471         if (i <= score->rule) {
1472                 switch (i) {
1473                 case IPV6_SADDR_RULE_SCOPE:
1474                         ret = score->scopedist;
1475                         break;
1476                 case IPV6_SADDR_RULE_PREFIX:
1477                         ret = score->matchlen;
1478                         break;
1479                 default:
1480                         ret = !!test_bit(i, score->scorebits);
1481                 }
1482                 goto out;
1483         }
1484
1485         switch (i) {
1486         case IPV6_SADDR_RULE_INIT:
1487                 /* Rule 0: remember if hiscore is not ready yet */
1488                 ret = !!score->ifa;
1489                 break;
1490         case IPV6_SADDR_RULE_LOCAL:
1491                 /* Rule 1: Prefer same address */
1492                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1493                 break;
1494         case IPV6_SADDR_RULE_SCOPE:
1495                 /* Rule 2: Prefer appropriate scope
1496                  *
1497                  *      ret
1498                  *       ^
1499                  *    -1 |  d 15
1500                  *    ---+--+-+---> scope
1501                  *       |
1502                  *       |             d is scope of the destination.
1503                  *  B-d  |  \
1504                  *       |   \      <- smaller scope is better if
1505                  *  B-15 |    \        if scope is enough for destination.
1506                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1507                  * d-C-1 | /
1508                  *       |/         <- greater is better
1509                  *   -C  /             if scope is not enough for destination.
1510                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1511                  *
1512                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1513                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1514                  * Assume B = 0 and we get C > 29.
1515                  */
1516                 ret = __ipv6_addr_src_scope(score->addr_type);
1517                 if (ret >= dst->scope)
1518                         ret = -ret;
1519                 else
1520                         ret -= 128;     /* 30 is enough */
1521                 score->scopedist = ret;
1522                 break;
1523         case IPV6_SADDR_RULE_PREFERRED:
1524             {
1525                 /* Rule 3: Avoid deprecated and optimistic addresses */
1526                 u8 avoid = IFA_F_DEPRECATED;
1527
1528                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1529                         avoid |= IFA_F_OPTIMISTIC;
1530                 ret = ipv6_saddr_preferred(score->addr_type) ||
1531                       !(score->ifa->flags & avoid);
1532                 break;
1533             }
1534 #ifdef CONFIG_IPV6_MIP6
1535         case IPV6_SADDR_RULE_HOA:
1536             {
1537                 /* Rule 4: Prefer home address */
1538                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1539                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1540                 break;
1541             }
1542 #endif
1543         case IPV6_SADDR_RULE_OIF:
1544                 /* Rule 5: Prefer outgoing interface */
1545                 ret = (!dst->ifindex ||
1546                        dst->ifindex == score->ifa->idev->dev->ifindex);
1547                 break;
1548         case IPV6_SADDR_RULE_LABEL:
1549                 /* Rule 6: Prefer matching label */
1550                 ret = ipv6_addr_label(net,
1551                                       &score->ifa->addr, score->addr_type,
1552                                       score->ifa->idev->dev->ifindex) == dst->label;
1553                 break;
1554         case IPV6_SADDR_RULE_PRIVACY:
1555             {
1556                 /* Rule 7: Prefer public address
1557                  * Note: prefer temporary address if use_tempaddr >= 2
1558                  */
1559                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1560                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1561                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1562                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1563                 break;
1564             }
1565         case IPV6_SADDR_RULE_ORCHID:
1566                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1567                  *          non-ORCHID vs non-ORCHID
1568                  */
1569                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1570                         ipv6_addr_orchid(dst->addr));
1571                 break;
1572         case IPV6_SADDR_RULE_PREFIX:
1573                 /* Rule 8: Use longest matching prefix */
1574                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1575                 if (ret > score->ifa->prefix_len)
1576                         ret = score->ifa->prefix_len;
1577                 score->matchlen = ret;
1578                 break;
1579 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1580         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1581                 /* Optimistic addresses still have lower precedence than other
1582                  * preferred addresses.
1583                  */
1584                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1585                 break;
1586 #endif
1587         default:
1588                 ret = 0;
1589         }
1590
1591         if (ret)
1592                 __set_bit(i, score->scorebits);
1593         score->rule = i;
1594 out:
1595         return ret;
1596 }
1597
1598 static int __ipv6_dev_get_saddr(struct net *net,
1599                                 struct ipv6_saddr_dst *dst,
1600                                 struct inet6_dev *idev,
1601                                 struct ipv6_saddr_score *scores,
1602                                 int hiscore_idx)
1603 {
1604         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1605
1606         list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1607                 int i;
1608
1609                 /*
1610                  * - Tentative Address (RFC2462 section 5.4)
1611                  *  - A tentative address is not considered
1612                  *    "assigned to an interface" in the traditional
1613                  *    sense, unless it is also flagged as optimistic.
1614                  * - Candidate Source Address (section 4)
1615                  *  - In any case, anycast addresses, multicast
1616                  *    addresses, and the unspecified address MUST
1617                  *    NOT be included in a candidate set.
1618                  */
1619                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1620                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1621                         continue;
1622
1623                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1624
1625                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1626                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1627                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1628                                             idev->dev->name);
1629                         continue;
1630                 }
1631
1632                 score->rule = -1;
1633                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1634
1635                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1636                         int minihiscore, miniscore;
1637
1638                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1639                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1640
1641                         if (minihiscore > miniscore) {
1642                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1643                                     score->scopedist > 0) {
1644                                         /*
1645                                          * special case:
1646                                          * each remaining entry
1647                                          * has too small (not enough)
1648                                          * scope, because ifa entries
1649                                          * are sorted by their scope
1650                                          * values.
1651                                          */
1652                                         goto out;
1653                                 }
1654                                 break;
1655                         } else if (minihiscore < miniscore) {
1656                                 swap(hiscore, score);
1657                                 hiscore_idx = 1 - hiscore_idx;
1658
1659                                 /* restore our iterator */
1660                                 score->ifa = hiscore->ifa;
1661
1662                                 break;
1663                         }
1664                 }
1665         }
1666 out:
1667         return hiscore_idx;
1668 }
1669
1670 static int ipv6_get_saddr_master(struct net *net,
1671                                  const struct net_device *dst_dev,
1672                                  const struct net_device *master,
1673                                  struct ipv6_saddr_dst *dst,
1674                                  struct ipv6_saddr_score *scores,
1675                                  int hiscore_idx)
1676 {
1677         struct inet6_dev *idev;
1678
1679         idev = __in6_dev_get(dst_dev);
1680         if (idev)
1681                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1682                                                    scores, hiscore_idx);
1683
1684         idev = __in6_dev_get(master);
1685         if (idev)
1686                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1687                                                    scores, hiscore_idx);
1688
1689         return hiscore_idx;
1690 }
1691
1692 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1693                        const struct in6_addr *daddr, unsigned int prefs,
1694                        struct in6_addr *saddr)
1695 {
1696         struct ipv6_saddr_score scores[2], *hiscore;
1697         struct ipv6_saddr_dst dst;
1698         struct inet6_dev *idev;
1699         struct net_device *dev;
1700         int dst_type;
1701         bool use_oif_addr = false;
1702         int hiscore_idx = 0;
1703         int ret = 0;
1704
1705         dst_type = __ipv6_addr_type(daddr);
1706         dst.addr = daddr;
1707         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1708         dst.scope = __ipv6_addr_src_scope(dst_type);
1709         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1710         dst.prefs = prefs;
1711
1712         scores[hiscore_idx].rule = -1;
1713         scores[hiscore_idx].ifa = NULL;
1714
1715         rcu_read_lock();
1716
1717         /* Candidate Source Address (section 4)
1718          *  - multicast and link-local destination address,
1719          *    the set of candidate source address MUST only
1720          *    include addresses assigned to interfaces
1721          *    belonging to the same link as the outgoing
1722          *    interface.
1723          * (- For site-local destination addresses, the
1724          *    set of candidate source addresses MUST only
1725          *    include addresses assigned to interfaces
1726          *    belonging to the same site as the outgoing
1727          *    interface.)
1728          *  - "It is RECOMMENDED that the candidate source addresses
1729          *    be the set of unicast addresses assigned to the
1730          *    interface that will be used to send to the destination
1731          *    (the 'outgoing' interface)." (RFC 6724)
1732          */
1733         if (dst_dev) {
1734                 idev = __in6_dev_get(dst_dev);
1735                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1736                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1737                     (idev && idev->cnf.use_oif_addrs_only)) {
1738                         use_oif_addr = true;
1739                 }
1740         }
1741
1742         if (use_oif_addr) {
1743                 if (idev)
1744                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1745         } else {
1746                 const struct net_device *master;
1747                 int master_idx = 0;
1748
1749                 /* if dst_dev exists and is enslaved to an L3 device, then
1750                  * prefer addresses from dst_dev and then the master over
1751                  * any other enslaved devices in the L3 domain.
1752                  */
1753                 master = l3mdev_master_dev_rcu(dst_dev);
1754                 if (master) {
1755                         master_idx = master->ifindex;
1756
1757                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1758                                                             master, &dst,
1759                                                             scores, hiscore_idx);
1760
1761                         if (scores[hiscore_idx].ifa)
1762                                 goto out;
1763                 }
1764
1765                 for_each_netdev_rcu(net, dev) {
1766                         /* only consider addresses on devices in the
1767                          * same L3 domain
1768                          */
1769                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1770                                 continue;
1771                         idev = __in6_dev_get(dev);
1772                         if (!idev)
1773                                 continue;
1774                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1775                 }
1776         }
1777
1778 out:
1779         hiscore = &scores[hiscore_idx];
1780         if (!hiscore->ifa)
1781                 ret = -EADDRNOTAVAIL;
1782         else
1783                 *saddr = hiscore->ifa->addr;
1784
1785         rcu_read_unlock();
1786         return ret;
1787 }
1788 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1789
1790 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1791                       u32 banned_flags)
1792 {
1793         struct inet6_ifaddr *ifp;
1794         int err = -EADDRNOTAVAIL;
1795
1796         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1797                 if (ifp->scope > IFA_LINK)
1798                         break;
1799                 if (ifp->scope == IFA_LINK &&
1800                     !(ifp->flags & banned_flags)) {
1801                         *addr = ifp->addr;
1802                         err = 0;
1803                         break;
1804                 }
1805         }
1806         return err;
1807 }
1808
1809 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1810                     u32 banned_flags)
1811 {
1812         struct inet6_dev *idev;
1813         int err = -EADDRNOTAVAIL;
1814
1815         rcu_read_lock();
1816         idev = __in6_dev_get(dev);
1817         if (idev) {
1818                 read_lock_bh(&idev->lock);
1819                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1820                 read_unlock_bh(&idev->lock);
1821         }
1822         rcu_read_unlock();
1823         return err;
1824 }
1825
1826 static int ipv6_count_addresses(const struct inet6_dev *idev)
1827 {
1828         const struct inet6_ifaddr *ifp;
1829         int cnt = 0;
1830
1831         rcu_read_lock();
1832         list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1833                 cnt++;
1834         rcu_read_unlock();
1835         return cnt;
1836 }
1837
1838 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1839                   const struct net_device *dev, int strict)
1840 {
1841         return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1842                                        strict, IFA_F_TENTATIVE);
1843 }
1844 EXPORT_SYMBOL(ipv6_chk_addr);
1845
1846 /* device argument is used to find the L3 domain of interest. If
1847  * skip_dev_check is set, then the ifp device is not checked against
1848  * the passed in dev argument. So the 2 cases for addresses checks are:
1849  *   1. does the address exist in the L3 domain that dev is part of
1850  *      (skip_dev_check = true), or
1851  *
1852  *   2. does the address exist on the specific device
1853  *      (skip_dev_check = false)
1854  */
1855 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1856                             const struct net_device *dev, bool skip_dev_check,
1857                             int strict, u32 banned_flags)
1858 {
1859         unsigned int hash = inet6_addr_hash(net, addr);
1860         const struct net_device *l3mdev;
1861         struct inet6_ifaddr *ifp;
1862         u32 ifp_flags;
1863
1864         rcu_read_lock();
1865
1866         l3mdev = l3mdev_master_dev_rcu(dev);
1867         if (skip_dev_check)
1868                 dev = NULL;
1869
1870         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1871                 if (!net_eq(dev_net(ifp->idev->dev), net))
1872                         continue;
1873
1874                 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1875                         continue;
1876
1877                 /* Decouple optimistic from tentative for evaluation here.
1878                  * Ban optimistic addresses explicitly, when required.
1879                  */
1880                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1881                             ? (ifp->flags&~IFA_F_TENTATIVE)
1882                             : ifp->flags;
1883                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1884                     !(ifp_flags&banned_flags) &&
1885                     (!dev || ifp->idev->dev == dev ||
1886                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1887                         rcu_read_unlock();
1888                         return 1;
1889                 }
1890         }
1891
1892         rcu_read_unlock();
1893         return 0;
1894 }
1895 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1896
1897
1898 /* Compares an address/prefix_len with addresses on device @dev.
1899  * If one is found it returns true.
1900  */
1901 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1902         const unsigned int prefix_len, struct net_device *dev)
1903 {
1904         const struct inet6_ifaddr *ifa;
1905         const struct inet6_dev *idev;
1906         bool ret = false;
1907
1908         rcu_read_lock();
1909         idev = __in6_dev_get(dev);
1910         if (idev) {
1911                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1912                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1913                         if (ret)
1914                                 break;
1915                 }
1916         }
1917         rcu_read_unlock();
1918
1919         return ret;
1920 }
1921 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1922
1923 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1924 {
1925         const struct inet6_ifaddr *ifa;
1926         const struct inet6_dev *idev;
1927         int     onlink;
1928
1929         onlink = 0;
1930         rcu_read_lock();
1931         idev = __in6_dev_get(dev);
1932         if (idev) {
1933                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1934                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1935                                                    ifa->prefix_len);
1936                         if (onlink)
1937                                 break;
1938                 }
1939         }
1940         rcu_read_unlock();
1941         return onlink;
1942 }
1943 EXPORT_SYMBOL(ipv6_chk_prefix);
1944
1945 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1946                                      struct net_device *dev, int strict)
1947 {
1948         unsigned int hash = inet6_addr_hash(net, addr);
1949         struct inet6_ifaddr *ifp, *result = NULL;
1950
1951         rcu_read_lock();
1952         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1953                 if (!net_eq(dev_net(ifp->idev->dev), net))
1954                         continue;
1955                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1956                         if (!dev || ifp->idev->dev == dev ||
1957                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1958                                 result = ifp;
1959                                 in6_ifa_hold(ifp);
1960                                 break;
1961                         }
1962                 }
1963         }
1964         rcu_read_unlock();
1965
1966         return result;
1967 }
1968
1969 /* Gets referenced address, destroys ifaddr */
1970
1971 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1972 {
1973         if (dad_failed)
1974                 ifp->flags |= IFA_F_DADFAILED;
1975
1976         if (ifp->flags&IFA_F_TEMPORARY) {
1977                 struct inet6_ifaddr *ifpub;
1978                 spin_lock_bh(&ifp->lock);
1979                 ifpub = ifp->ifpub;
1980                 if (ifpub) {
1981                         in6_ifa_hold(ifpub);
1982                         spin_unlock_bh(&ifp->lock);
1983                         ipv6_create_tempaddr(ifpub, ifp, true);
1984                         in6_ifa_put(ifpub);
1985                 } else {
1986                         spin_unlock_bh(&ifp->lock);
1987                 }
1988                 ipv6_del_addr(ifp);
1989         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1990                 spin_lock_bh(&ifp->lock);
1991                 addrconf_del_dad_work(ifp);
1992                 ifp->flags |= IFA_F_TENTATIVE;
1993                 if (dad_failed)
1994                         ifp->flags &= ~IFA_F_OPTIMISTIC;
1995                 spin_unlock_bh(&ifp->lock);
1996                 if (dad_failed)
1997                         ipv6_ifa_notify(0, ifp);
1998                 in6_ifa_put(ifp);
1999         } else {
2000                 ipv6_del_addr(ifp);
2001         }
2002 }
2003
2004 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2005 {
2006         int err = -ENOENT;
2007
2008         spin_lock_bh(&ifp->lock);
2009         if (ifp->state == INET6_IFADDR_STATE_DAD) {
2010                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2011                 err = 0;
2012         }
2013         spin_unlock_bh(&ifp->lock);
2014
2015         return err;
2016 }
2017
2018 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2019 {
2020         struct inet6_dev *idev = ifp->idev;
2021         struct net *net = dev_net(ifp->idev->dev);
2022
2023         if (addrconf_dad_end(ifp)) {
2024                 in6_ifa_put(ifp);
2025                 return;
2026         }
2027
2028         net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2029                              ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2030
2031         spin_lock_bh(&ifp->lock);
2032
2033         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2034                 int scope = ifp->scope;
2035                 u32 flags = ifp->flags;
2036                 struct in6_addr new_addr;
2037                 struct inet6_ifaddr *ifp2;
2038                 u32 valid_lft, preferred_lft;
2039                 int pfxlen = ifp->prefix_len;
2040                 int retries = ifp->stable_privacy_retry + 1;
2041
2042                 if (retries > net->ipv6.sysctl.idgen_retries) {
2043                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2044                                              ifp->idev->dev->name);
2045                         goto errdad;
2046                 }
2047
2048                 new_addr = ifp->addr;
2049                 if (ipv6_generate_stable_address(&new_addr, retries,
2050                                                  idev))
2051                         goto errdad;
2052
2053                 valid_lft = ifp->valid_lft;
2054                 preferred_lft = ifp->prefered_lft;
2055
2056                 spin_unlock_bh(&ifp->lock);
2057
2058                 if (idev->cnf.max_addresses &&
2059                     ipv6_count_addresses(idev) >=
2060                     idev->cnf.max_addresses)
2061                         goto lock_errdad;
2062
2063                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2064                                      ifp->idev->dev->name);
2065
2066                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2067                                      scope, flags, valid_lft,
2068                                      preferred_lft, false, NULL);
2069                 if (IS_ERR(ifp2))
2070                         goto lock_errdad;
2071
2072                 spin_lock_bh(&ifp2->lock);
2073                 ifp2->stable_privacy_retry = retries;
2074                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2075                 spin_unlock_bh(&ifp2->lock);
2076
2077                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2078                 in6_ifa_put(ifp2);
2079 lock_errdad:
2080                 spin_lock_bh(&ifp->lock);
2081         }
2082
2083 errdad:
2084         /* transition from _POSTDAD to _ERRDAD */
2085         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2086         spin_unlock_bh(&ifp->lock);
2087
2088         addrconf_mod_dad_work(ifp, 0);
2089         in6_ifa_put(ifp);
2090 }
2091
2092 /* Join to solicited addr multicast group.
2093  * caller must hold RTNL */
2094 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2095 {
2096         struct in6_addr maddr;
2097
2098         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2099                 return;
2100
2101         addrconf_addr_solict_mult(addr, &maddr);
2102         ipv6_dev_mc_inc(dev, &maddr);
2103 }
2104
2105 /* caller must hold RTNL */
2106 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2107 {
2108         struct in6_addr maddr;
2109
2110         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2111                 return;
2112
2113         addrconf_addr_solict_mult(addr, &maddr);
2114         __ipv6_dev_mc_dec(idev, &maddr);
2115 }
2116
2117 /* caller must hold RTNL */
2118 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2119 {
2120         struct in6_addr addr;
2121
2122         if (ifp->prefix_len >= 127) /* RFC 6164 */
2123                 return;
2124         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2125         if (ipv6_addr_any(&addr))
2126                 return;
2127         __ipv6_dev_ac_inc(ifp->idev, &addr);
2128 }
2129
2130 /* caller must hold RTNL */
2131 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2132 {
2133         struct in6_addr addr;
2134
2135         if (ifp->prefix_len >= 127) /* RFC 6164 */
2136                 return;
2137         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2138         if (ipv6_addr_any(&addr))
2139                 return;
2140         __ipv6_dev_ac_dec(ifp->idev, &addr);
2141 }
2142
2143 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2144 {
2145         switch (dev->addr_len) {
2146         case ETH_ALEN:
2147                 memcpy(eui, dev->dev_addr, 3);
2148                 eui[3] = 0xFF;
2149                 eui[4] = 0xFE;
2150                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2151                 break;
2152         case EUI64_ADDR_LEN:
2153                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2154                 eui[0] ^= 2;
2155                 break;
2156         default:
2157                 return -1;
2158         }
2159
2160         return 0;
2161 }
2162
2163 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2164 {
2165         union fwnet_hwaddr *ha;
2166
2167         if (dev->addr_len != FWNET_ALEN)
2168                 return -1;
2169
2170         ha = (union fwnet_hwaddr *)dev->dev_addr;
2171
2172         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2173         eui[0] ^= 2;
2174         return 0;
2175 }
2176
2177 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2178 {
2179         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2180         if (dev->addr_len != ARCNET_ALEN)
2181                 return -1;
2182         memset(eui, 0, 7);
2183         eui[7] = *(u8 *)dev->dev_addr;
2184         return 0;
2185 }
2186
2187 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2188 {
2189         if (dev->addr_len != INFINIBAND_ALEN)
2190                 return -1;
2191         memcpy(eui, dev->dev_addr + 12, 8);
2192         eui[0] |= 2;
2193         return 0;
2194 }
2195
2196 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2197 {
2198         if (addr == 0)
2199                 return -1;
2200         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2201                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2202                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2203                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2204                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2205                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2206         eui[1] = 0;
2207         eui[2] = 0x5E;
2208         eui[3] = 0xFE;
2209         memcpy(eui + 4, &addr, 4);
2210         return 0;
2211 }
2212
2213 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2214 {
2215         if (dev->priv_flags & IFF_ISATAP)
2216                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2217         return -1;
2218 }
2219
2220 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2221 {
2222         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2223 }
2224
2225 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2226 {
2227         memcpy(eui, dev->perm_addr, 3);
2228         memcpy(eui + 5, dev->perm_addr + 3, 3);
2229         eui[3] = 0xFF;
2230         eui[4] = 0xFE;
2231         eui[0] ^= 2;
2232         return 0;
2233 }
2234
2235 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2236 {
2237         switch (dev->type) {
2238         case ARPHRD_ETHER:
2239         case ARPHRD_FDDI:
2240                 return addrconf_ifid_eui48(eui, dev);
2241         case ARPHRD_ARCNET:
2242                 return addrconf_ifid_arcnet(eui, dev);
2243         case ARPHRD_INFINIBAND:
2244                 return addrconf_ifid_infiniband(eui, dev);
2245         case ARPHRD_SIT:
2246                 return addrconf_ifid_sit(eui, dev);
2247         case ARPHRD_IPGRE:
2248         case ARPHRD_TUNNEL:
2249                 return addrconf_ifid_gre(eui, dev);
2250         case ARPHRD_6LOWPAN:
2251                 return addrconf_ifid_6lowpan(eui, dev);
2252         case ARPHRD_IEEE1394:
2253                 return addrconf_ifid_ieee1394(eui, dev);
2254         case ARPHRD_TUNNEL6:
2255         case ARPHRD_IP6GRE:
2256                 return addrconf_ifid_ip6tnl(eui, dev);
2257         }
2258         return -1;
2259 }
2260
2261 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2262 {
2263         int err = -1;
2264         struct inet6_ifaddr *ifp;
2265
2266         read_lock_bh(&idev->lock);
2267         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2268                 if (ifp->scope > IFA_LINK)
2269                         break;
2270                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2271                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2272                         err = 0;
2273                         break;
2274                 }
2275         }
2276         read_unlock_bh(&idev->lock);
2277         return err;
2278 }
2279
2280 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2281 static void ipv6_regen_rndid(struct inet6_dev *idev)
2282 {
2283 regen:
2284         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2285         idev->rndid[0] &= ~0x02;
2286
2287         /*
2288          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2289          * check if generated address is not inappropriate
2290          *
2291          *  - Reserved subnet anycast (RFC 2526)
2292          *      11111101 11....11 1xxxxxxx
2293          *  - ISATAP (RFC4214) 6.1
2294          *      00-00-5E-FE-xx-xx-xx-xx
2295          *  - value 0
2296          *  - XXX: already assigned to an address on the device
2297          */
2298         if (idev->rndid[0] == 0xfd &&
2299             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2300             (idev->rndid[7]&0x80))
2301                 goto regen;
2302         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2303                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2304                         goto regen;
2305                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2306                         goto regen;
2307         }
2308 }
2309
2310 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2311 {
2312         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2313                 ipv6_regen_rndid(idev);
2314 }
2315
2316 /*
2317  *      Add prefix route.
2318  */
2319
2320 static void
2321 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2322                       unsigned long expires, u32 flags, gfp_t gfp_flags)
2323 {
2324         struct fib6_config cfg = {
2325                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2326                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2327                 .fc_ifindex = dev->ifindex,
2328                 .fc_expires = expires,
2329                 .fc_dst_len = plen,
2330                 .fc_flags = RTF_UP | flags,
2331                 .fc_nlinfo.nl_net = dev_net(dev),
2332                 .fc_protocol = RTPROT_KERNEL,
2333                 .fc_type = RTN_UNICAST,
2334         };
2335
2336         cfg.fc_dst = *pfx;
2337
2338         /* Prevent useless cloning on PtP SIT.
2339            This thing is done here expecting that the whole
2340            class of non-broadcast devices need not cloning.
2341          */
2342 #if IS_ENABLED(CONFIG_IPV6_SIT)
2343         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2344                 cfg.fc_flags |= RTF_NONEXTHOP;
2345 #endif
2346
2347         ip6_route_add(&cfg, gfp_flags, NULL);
2348 }
2349
2350
2351 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2352                                                   int plen,
2353                                                   const struct net_device *dev,
2354                                                   u32 flags, u32 noflags)
2355 {
2356         struct fib6_node *fn;
2357         struct fib6_info *rt = NULL;
2358         struct fib6_table *table;
2359         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2360
2361         table = fib6_get_table(dev_net(dev), tb_id);
2362         if (!table)
2363                 return NULL;
2364
2365         rcu_read_lock();
2366         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2367         if (!fn)
2368                 goto out;
2369
2370         for_each_fib6_node_rt_rcu(fn) {
2371                 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
2372                         continue;
2373                 if ((rt->fib6_flags & flags) != flags)
2374                         continue;
2375                 if ((rt->fib6_flags & noflags) != 0)
2376                         continue;
2377                 fib6_info_hold(rt);
2378                 break;
2379         }
2380 out:
2381         rcu_read_unlock();
2382         return rt;
2383 }
2384
2385
2386 /* Create "default" multicast route to the interface */
2387
2388 static void addrconf_add_mroute(struct net_device *dev)
2389 {
2390         struct fib6_config cfg = {
2391                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2392                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2393                 .fc_ifindex = dev->ifindex,
2394                 .fc_dst_len = 8,
2395                 .fc_flags = RTF_UP,
2396                 .fc_type = RTN_UNICAST,
2397                 .fc_nlinfo.nl_net = dev_net(dev),
2398         };
2399
2400         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2401
2402         ip6_route_add(&cfg, GFP_ATOMIC, NULL);
2403 }
2404
2405 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2406 {
2407         struct inet6_dev *idev;
2408
2409         ASSERT_RTNL();
2410
2411         idev = ipv6_find_idev(dev);
2412         if (!idev)
2413                 return ERR_PTR(-ENOBUFS);
2414
2415         if (idev->cnf.disable_ipv6)
2416                 return ERR_PTR(-EACCES);
2417
2418         /* Add default multicast route */
2419         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2420                 addrconf_add_mroute(dev);
2421
2422         return idev;
2423 }
2424
2425 static void manage_tempaddrs(struct inet6_dev *idev,
2426                              struct inet6_ifaddr *ifp,
2427                              __u32 valid_lft, __u32 prefered_lft,
2428                              bool create, unsigned long now)
2429 {
2430         u32 flags;
2431         struct inet6_ifaddr *ift;
2432
2433         read_lock_bh(&idev->lock);
2434         /* update all temporary addresses in the list */
2435         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2436                 int age, max_valid, max_prefered;
2437
2438                 if (ifp != ift->ifpub)
2439                         continue;
2440
2441                 /* RFC 4941 section 3.3:
2442                  * If a received option will extend the lifetime of a public
2443                  * address, the lifetimes of temporary addresses should
2444                  * be extended, subject to the overall constraint that no
2445                  * temporary addresses should ever remain "valid" or "preferred"
2446                  * for a time longer than (TEMP_VALID_LIFETIME) or
2447                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2448                  */
2449                 age = (now - ift->cstamp) / HZ;
2450                 max_valid = idev->cnf.temp_valid_lft - age;
2451                 if (max_valid < 0)
2452                         max_valid = 0;
2453
2454                 max_prefered = idev->cnf.temp_prefered_lft -
2455                                idev->desync_factor - age;
2456                 if (max_prefered < 0)
2457                         max_prefered = 0;
2458
2459                 if (valid_lft > max_valid)
2460                         valid_lft = max_valid;
2461
2462                 if (prefered_lft > max_prefered)
2463                         prefered_lft = max_prefered;
2464
2465                 spin_lock(&ift->lock);
2466                 flags = ift->flags;
2467                 ift->valid_lft = valid_lft;
2468                 ift->prefered_lft = prefered_lft;
2469                 ift->tstamp = now;
2470                 if (prefered_lft > 0)
2471                         ift->flags &= ~IFA_F_DEPRECATED;
2472
2473                 spin_unlock(&ift->lock);
2474                 if (!(flags&IFA_F_TENTATIVE))
2475                         ipv6_ifa_notify(0, ift);
2476         }
2477
2478         if ((create || list_empty(&idev->tempaddr_list)) &&
2479             idev->cnf.use_tempaddr > 0) {
2480                 /* When a new public address is created as described
2481                  * in [ADDRCONF], also create a new temporary address.
2482                  * Also create a temporary address if it's enabled but
2483                  * no temporary address currently exists.
2484                  */
2485                 read_unlock_bh(&idev->lock);
2486                 ipv6_create_tempaddr(ifp, NULL, false);
2487         } else {
2488                 read_unlock_bh(&idev->lock);
2489         }
2490 }
2491
2492 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2493 {
2494         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2495                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2496 }
2497
2498 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2499                                  const struct prefix_info *pinfo,
2500                                  struct inet6_dev *in6_dev,
2501                                  const struct in6_addr *addr, int addr_type,
2502                                  u32 addr_flags, bool sllao, bool tokenized,
2503                                  __u32 valid_lft, u32 prefered_lft)
2504 {
2505         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2506         int create = 0, update_lft = 0;
2507
2508         if (!ifp && valid_lft) {
2509                 int max_addresses = in6_dev->cnf.max_addresses;
2510
2511 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2512                 if ((net->ipv6.devconf_all->optimistic_dad ||
2513                      in6_dev->cnf.optimistic_dad) &&
2514                     !net->ipv6.devconf_all->forwarding && sllao)
2515                         addr_flags |= IFA_F_OPTIMISTIC;
2516 #endif
2517
2518                 /* Do not allow to create too much of autoconfigured
2519                  * addresses; this would be too easy way to crash kernel.
2520                  */
2521                 if (!max_addresses ||
2522                     ipv6_count_addresses(in6_dev) < max_addresses)
2523                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2524                                             pinfo->prefix_len,
2525                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2526                                             addr_flags, valid_lft,
2527                                             prefered_lft, false, NULL);
2528
2529                 if (IS_ERR_OR_NULL(ifp))
2530                         return -1;
2531
2532                 create = 1;
2533                 spin_lock_bh(&ifp->lock);
2534                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2535                 ifp->cstamp = jiffies;
2536                 ifp->tokenized = tokenized;
2537                 spin_unlock_bh(&ifp->lock);
2538                 addrconf_dad_start(ifp);
2539         }
2540
2541         if (ifp) {
2542                 u32 flags;
2543                 unsigned long now;
2544                 u32 stored_lft;
2545
2546                 /* update lifetime (RFC2462 5.5.3 e) */
2547                 spin_lock_bh(&ifp->lock);
2548                 now = jiffies;
2549                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2550                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2551                 else
2552                         stored_lft = 0;
2553                 if (!create && stored_lft) {
2554                         const u32 minimum_lft = min_t(u32,
2555                                 stored_lft, MIN_VALID_LIFETIME);
2556                         valid_lft = max(valid_lft, minimum_lft);
2557
2558                         /* RFC4862 Section 5.5.3e:
2559                          * "Note that the preferred lifetime of the
2560                          *  corresponding address is always reset to
2561                          *  the Preferred Lifetime in the received
2562                          *  Prefix Information option, regardless of
2563                          *  whether the valid lifetime is also reset or
2564                          *  ignored."
2565                          *
2566                          * So we should always update prefered_lft here.
2567                          */
2568                         update_lft = 1;
2569                 }
2570
2571                 if (update_lft) {
2572                         ifp->valid_lft = valid_lft;
2573                         ifp->prefered_lft = prefered_lft;
2574                         ifp->tstamp = now;
2575                         flags = ifp->flags;
2576                         ifp->flags &= ~IFA_F_DEPRECATED;
2577                         spin_unlock_bh(&ifp->lock);
2578
2579                         if (!(flags&IFA_F_TENTATIVE))
2580                                 ipv6_ifa_notify(0, ifp);
2581                 } else
2582                         spin_unlock_bh(&ifp->lock);
2583
2584                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2585                                  create, now);
2586
2587                 in6_ifa_put(ifp);
2588                 addrconf_verify();
2589         }
2590
2591         return 0;
2592 }
2593 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2594
2595 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2596 {
2597         struct prefix_info *pinfo;
2598         __u32 valid_lft;
2599         __u32 prefered_lft;
2600         int addr_type, err;
2601         u32 addr_flags = 0;
2602         struct inet6_dev *in6_dev;
2603         struct net *net = dev_net(dev);
2604
2605         pinfo = (struct prefix_info *) opt;
2606
2607         if (len < sizeof(struct prefix_info)) {
2608                 netdev_dbg(dev, "addrconf: prefix option too short\n");
2609                 return;
2610         }
2611
2612         /*
2613          *      Validation checks ([ADDRCONF], page 19)
2614          */
2615
2616         addr_type = ipv6_addr_type(&pinfo->prefix);
2617
2618         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2619                 return;
2620
2621         valid_lft = ntohl(pinfo->valid);
2622         prefered_lft = ntohl(pinfo->prefered);
2623
2624         if (prefered_lft > valid_lft) {
2625                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2626                 return;
2627         }
2628
2629         in6_dev = in6_dev_get(dev);
2630
2631         if (!in6_dev) {
2632                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2633                                     dev->name);
2634                 return;
2635         }
2636
2637         /*
2638          *      Two things going on here:
2639          *      1) Add routes for on-link prefixes
2640          *      2) Configure prefixes with the auto flag set
2641          */
2642
2643         if (pinfo->onlink) {
2644                 struct fib6_info *rt;
2645                 unsigned long rt_expires;
2646
2647                 /* Avoid arithmetic overflow. Really, we could
2648                  * save rt_expires in seconds, likely valid_lft,
2649                  * but it would require division in fib gc, that it
2650                  * not good.
2651                  */
2652                 if (HZ > USER_HZ)
2653                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2654                 else
2655                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2656
2657                 if (addrconf_finite_timeout(rt_expires))
2658                         rt_expires *= HZ;
2659
2660                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2661                                                pinfo->prefix_len,
2662                                                dev,
2663                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2664                                                RTF_GATEWAY | RTF_DEFAULT);
2665
2666                 if (rt) {
2667                         /* Autoconf prefix route */
2668                         if (valid_lft == 0) {
2669                                 ip6_del_rt(net, rt);
2670                                 rt = NULL;
2671                         } else if (addrconf_finite_timeout(rt_expires)) {
2672                                 /* not infinity */
2673                                 fib6_set_expires(rt, jiffies + rt_expires);
2674                         } else {
2675                                 fib6_clean_expires(rt);
2676                         }
2677                 } else if (valid_lft) {
2678                         clock_t expires = 0;
2679                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2680                         if (addrconf_finite_timeout(rt_expires)) {
2681                                 /* not infinity */
2682                                 flags |= RTF_EXPIRES;
2683                                 expires = jiffies_to_clock_t(rt_expires);
2684                         }
2685                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2686                                               dev, expires, flags, GFP_ATOMIC);
2687                 }
2688                 fib6_info_release(rt);
2689         }
2690
2691         /* Try to figure out our local address for this prefix */
2692
2693         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2694                 struct in6_addr addr;
2695                 bool tokenized = false, dev_addr_generated = false;
2696
2697                 if (pinfo->prefix_len == 64) {
2698                         memcpy(&addr, &pinfo->prefix, 8);
2699
2700                         if (!ipv6_addr_any(&in6_dev->token)) {
2701                                 read_lock_bh(&in6_dev->lock);
2702                                 memcpy(addr.s6_addr + 8,
2703                                        in6_dev->token.s6_addr + 8, 8);
2704                                 read_unlock_bh(&in6_dev->lock);
2705                                 tokenized = true;
2706                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2707                                    !ipv6_generate_stable_address(&addr, 0,
2708                                                                  in6_dev)) {
2709                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2710                                 goto ok;
2711                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2712                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2713                                 goto put;
2714                         } else {
2715                                 dev_addr_generated = true;
2716                         }
2717                         goto ok;
2718                 }
2719                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2720                                     pinfo->prefix_len);
2721                 goto put;
2722
2723 ok:
2724                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2725                                                    &addr, addr_type,
2726                                                    addr_flags, sllao,
2727                                                    tokenized, valid_lft,
2728                                                    prefered_lft);
2729                 if (err)
2730                         goto put;
2731
2732                 /* Ignore error case here because previous prefix add addr was
2733                  * successful which will be notified.
2734                  */
2735                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2736                                               addr_type, addr_flags, sllao,
2737                                               tokenized, valid_lft,
2738                                               prefered_lft,
2739                                               dev_addr_generated);
2740         }
2741         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2742 put:
2743         in6_dev_put(in6_dev);
2744 }
2745
2746 /*
2747  *      Set destination address.
2748  *      Special case for SIT interfaces where we create a new "virtual"
2749  *      device.
2750  */
2751 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2752 {
2753         struct in6_ifreq ireq;
2754         struct net_device *dev;
2755         int err = -EINVAL;
2756
2757         rtnl_lock();
2758
2759         err = -EFAULT;
2760         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2761                 goto err_exit;
2762
2763         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2764
2765         err = -ENODEV;
2766         if (!dev)
2767                 goto err_exit;
2768
2769 #if IS_ENABLED(CONFIG_IPV6_SIT)
2770         if (dev->type == ARPHRD_SIT) {
2771                 const struct net_device_ops *ops = dev->netdev_ops;
2772                 struct ifreq ifr;
2773                 struct ip_tunnel_parm p;
2774
2775                 err = -EADDRNOTAVAIL;
2776                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2777                         goto err_exit;
2778
2779                 memset(&p, 0, sizeof(p));
2780                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2781                 p.iph.saddr = 0;
2782                 p.iph.version = 4;
2783                 p.iph.ihl = 5;
2784                 p.iph.protocol = IPPROTO_IPV6;
2785                 p.iph.ttl = 64;
2786                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2787
2788                 if (ops->ndo_do_ioctl) {
2789                         mm_segment_t oldfs = get_fs();
2790
2791                         set_fs(KERNEL_DS);
2792                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2793                         set_fs(oldfs);
2794                 } else
2795                         err = -EOPNOTSUPP;
2796
2797                 if (err == 0) {
2798                         err = -ENOBUFS;
2799                         dev = __dev_get_by_name(net, p.name);
2800                         if (!dev)
2801                                 goto err_exit;
2802                         err = dev_open(dev);
2803                 }
2804         }
2805 #endif
2806
2807 err_exit:
2808         rtnl_unlock();
2809         return err;
2810 }
2811
2812 static int ipv6_mc_config(struct sock *sk, bool join,
2813                           const struct in6_addr *addr, int ifindex)
2814 {
2815         int ret;
2816
2817         ASSERT_RTNL();
2818
2819         lock_sock(sk);
2820         if (join)
2821                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2822         else
2823                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2824         release_sock(sk);
2825
2826         return ret;
2827 }
2828
2829 /*
2830  *      Manual configuration of address on an interface
2831  */
2832 static int inet6_addr_add(struct net *net, int ifindex,
2833                           const struct in6_addr *pfx,
2834                           const struct in6_addr *peer_pfx,
2835                           unsigned int plen, __u32 ifa_flags,
2836                           __u32 prefered_lft, __u32 valid_lft,
2837                           struct netlink_ext_ack *extack)
2838 {
2839         struct inet6_ifaddr *ifp;
2840         struct inet6_dev *idev;
2841         struct net_device *dev;
2842         unsigned long timeout;
2843         clock_t expires;
2844         int scope;
2845         u32 flags;
2846
2847         ASSERT_RTNL();
2848
2849         if (plen > 128)
2850                 return -EINVAL;
2851
2852         /* check the lifetime */
2853         if (!valid_lft || prefered_lft > valid_lft)
2854                 return -EINVAL;
2855
2856         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2857                 return -EINVAL;
2858
2859         dev = __dev_get_by_index(net, ifindex);
2860         if (!dev)
2861                 return -ENODEV;
2862
2863         idev = addrconf_add_dev(dev);
2864         if (IS_ERR(idev))
2865                 return PTR_ERR(idev);
2866
2867         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2868                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2869                                          true, pfx, ifindex);
2870
2871                 if (ret < 0)
2872                         return ret;
2873         }
2874
2875         scope = ipv6_addr_scope(pfx);
2876
2877         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2878         if (addrconf_finite_timeout(timeout)) {
2879                 expires = jiffies_to_clock_t(timeout * HZ);
2880                 valid_lft = timeout;
2881                 flags = RTF_EXPIRES;
2882         } else {
2883                 expires = 0;
2884                 flags = 0;
2885                 ifa_flags |= IFA_F_PERMANENT;
2886         }
2887
2888         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2889         if (addrconf_finite_timeout(timeout)) {
2890                 if (timeout == 0)
2891                         ifa_flags |= IFA_F_DEPRECATED;
2892                 prefered_lft = timeout;
2893         }
2894
2895         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2896                             valid_lft, prefered_lft, true, extack);
2897
2898         if (!IS_ERR(ifp)) {
2899                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2900                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2901                                               expires, flags, GFP_KERNEL);
2902                 }
2903
2904                 /* Send a netlink notification if DAD is enabled and
2905                  * optimistic flag is not set
2906                  */
2907                 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2908                         ipv6_ifa_notify(0, ifp);
2909                 /*
2910                  * Note that section 3.1 of RFC 4429 indicates
2911                  * that the Optimistic flag should not be set for
2912                  * manually configured addresses
2913                  */
2914                 addrconf_dad_start(ifp);
2915                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2916                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2917                                          true, jiffies);
2918                 in6_ifa_put(ifp);
2919                 addrconf_verify_rtnl();
2920                 return 0;
2921         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2922                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2923                                false, pfx, ifindex);
2924         }
2925
2926         return PTR_ERR(ifp);
2927 }
2928
2929 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2930                           const struct in6_addr *pfx, unsigned int plen)
2931 {
2932         struct inet6_ifaddr *ifp;
2933         struct inet6_dev *idev;
2934         struct net_device *dev;
2935
2936         if (plen > 128)
2937                 return -EINVAL;
2938
2939         dev = __dev_get_by_index(net, ifindex);
2940         if (!dev)
2941                 return -ENODEV;
2942
2943         idev = __in6_dev_get(dev);
2944         if (!idev)
2945                 return -ENXIO;
2946
2947         read_lock_bh(&idev->lock);
2948         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2949                 if (ifp->prefix_len == plen &&
2950                     ipv6_addr_equal(pfx, &ifp->addr)) {
2951                         in6_ifa_hold(ifp);
2952                         read_unlock_bh(&idev->lock);
2953
2954                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2955                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2956                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2957                                                  jiffies);
2958                         ipv6_del_addr(ifp);
2959                         addrconf_verify_rtnl();
2960                         if (ipv6_addr_is_multicast(pfx)) {
2961                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2962                                                false, pfx, dev->ifindex);
2963                         }
2964                         return 0;
2965                 }
2966         }
2967         read_unlock_bh(&idev->lock);
2968         return -EADDRNOTAVAIL;
2969 }
2970
2971
2972 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2973 {
2974         struct in6_ifreq ireq;
2975         int err;
2976
2977         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2978                 return -EPERM;
2979
2980         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2981                 return -EFAULT;
2982
2983         rtnl_lock();
2984         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2985                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2986                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL);
2987         rtnl_unlock();
2988         return err;
2989 }
2990
2991 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2992 {
2993         struct in6_ifreq ireq;
2994         int err;
2995
2996         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2997                 return -EPERM;
2998
2999         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3000                 return -EFAULT;
3001
3002         rtnl_lock();
3003         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3004                              ireq.ifr6_prefixlen);
3005         rtnl_unlock();
3006         return err;
3007 }
3008
3009 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3010                      int plen, int scope)
3011 {
3012         struct inet6_ifaddr *ifp;
3013
3014         ifp = ipv6_add_addr(idev, addr, NULL, plen,
3015                             scope, IFA_F_PERMANENT,
3016                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
3017                             true, NULL);
3018         if (!IS_ERR(ifp)) {
3019                 spin_lock_bh(&ifp->lock);
3020                 ifp->flags &= ~IFA_F_TENTATIVE;
3021                 spin_unlock_bh(&ifp->lock);
3022                 rt_genid_bump_ipv6(dev_net(idev->dev));
3023                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3024                 in6_ifa_put(ifp);
3025         }
3026 }
3027
3028 #if IS_ENABLED(CONFIG_IPV6_SIT)
3029 static void sit_add_v4_addrs(struct inet6_dev *idev)
3030 {
3031         struct in6_addr addr;
3032         struct net_device *dev;
3033         struct net *net = dev_net(idev->dev);
3034         int scope, plen;
3035         u32 pflags = 0;
3036
3037         ASSERT_RTNL();
3038
3039         memset(&addr, 0, sizeof(struct in6_addr));
3040         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3041
3042         if (idev->dev->flags&IFF_POINTOPOINT) {
3043                 addr.s6_addr32[0] = htonl(0xfe800000);
3044                 scope = IFA_LINK;
3045                 plen = 64;
3046         } else {
3047                 scope = IPV6_ADDR_COMPATv4;
3048                 plen = 96;
3049                 pflags |= RTF_NONEXTHOP;
3050         }
3051
3052         if (addr.s6_addr32[3]) {
3053                 add_addr(idev, &addr, plen, scope);
3054                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags,
3055                                       GFP_ATOMIC);
3056                 return;
3057         }
3058
3059         for_each_netdev(net, dev) {
3060                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3061                 if (in_dev && (dev->flags & IFF_UP)) {
3062                         struct in_ifaddr *ifa;
3063
3064                         int flag = scope;
3065
3066                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3067
3068                                 addr.s6_addr32[3] = ifa->ifa_local;
3069
3070                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3071                                         continue;
3072                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3073                                         if (idev->dev->flags&IFF_POINTOPOINT)
3074                                                 continue;
3075                                         flag |= IFA_HOST;
3076                                 }
3077
3078                                 add_addr(idev, &addr, plen, flag);
3079                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3080                                                       pflags, GFP_ATOMIC);
3081                         }
3082                 }
3083         }
3084 }
3085 #endif
3086
3087 static void init_loopback(struct net_device *dev)
3088 {
3089         struct inet6_dev  *idev;
3090
3091         /* ::1 */
3092
3093         ASSERT_RTNL();
3094
3095         idev = ipv6_find_idev(dev);
3096         if (!idev) {
3097                 pr_debug("%s: add_dev failed\n", __func__);
3098                 return;
3099         }
3100
3101         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3102 }
3103
3104 void addrconf_add_linklocal(struct inet6_dev *idev,
3105                             const struct in6_addr *addr, u32 flags)
3106 {
3107         struct inet6_ifaddr *ifp;
3108         u32 addr_flags = flags | IFA_F_PERMANENT;
3109
3110 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3111         if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3112              idev->cnf.optimistic_dad) &&
3113             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3114                 addr_flags |= IFA_F_OPTIMISTIC;
3115 #endif
3116
3117         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3118                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
3119         if (!IS_ERR(ifp)) {
3120                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev,
3121                                       0, 0, GFP_ATOMIC);
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,
3237                                               0, 0, GFP_KERNEL);
3238                 break;
3239         case IN6_ADDR_GEN_MODE_EUI64:
3240                 /* addrconf_add_linklocal also adds a prefix_route and we
3241                  * only need to care about prefix routes if ipv6_generate_eui64
3242                  * couldn't generate one.
3243                  */
3244                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3245                         addrconf_add_linklocal(idev, &addr, 0);
3246                 else if (prefix_route)
3247                         addrconf_prefix_route(&addr, 64, idev->dev,
3248                                               0, 0, GFP_ATOMIC);
3249                 break;
3250         case IN6_ADDR_GEN_MODE_NONE:
3251         default:
3252                 /* will not add any link local address */
3253                 break;
3254         }
3255 }
3256
3257 static void addrconf_dev_config(struct net_device *dev)
3258 {
3259         struct inet6_dev *idev;
3260
3261         ASSERT_RTNL();
3262
3263         if ((dev->type != ARPHRD_ETHER) &&
3264             (dev->type != ARPHRD_FDDI) &&
3265             (dev->type != ARPHRD_ARCNET) &&
3266             (dev->type != ARPHRD_INFINIBAND) &&
3267             (dev->type != ARPHRD_IEEE1394) &&
3268             (dev->type != ARPHRD_TUNNEL6) &&
3269             (dev->type != ARPHRD_6LOWPAN) &&
3270             (dev->type != ARPHRD_IP6GRE) &&
3271             (dev->type != ARPHRD_IPGRE) &&
3272             (dev->type != ARPHRD_TUNNEL) &&
3273             (dev->type != ARPHRD_NONE)) {
3274                 /* Alas, we support only Ethernet autoconfiguration. */
3275                 return;
3276         }
3277
3278         idev = addrconf_add_dev(dev);
3279         if (IS_ERR(idev))
3280                 return;
3281
3282         /* this device type has no EUI support */
3283         if (dev->type == ARPHRD_NONE &&
3284             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3285                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3286
3287         addrconf_addr_gen(idev, false);
3288 }
3289
3290 #if IS_ENABLED(CONFIG_IPV6_SIT)
3291 static void addrconf_sit_config(struct net_device *dev)
3292 {
3293         struct inet6_dev *idev;
3294
3295         ASSERT_RTNL();
3296
3297         /*
3298          * Configure the tunnel with one of our IPv4
3299          * addresses... we should configure all of
3300          * our v4 addrs in the tunnel
3301          */
3302
3303         idev = ipv6_find_idev(dev);
3304         if (!idev) {
3305                 pr_debug("%s: add_dev failed\n", __func__);
3306                 return;
3307         }
3308
3309         if (dev->priv_flags & IFF_ISATAP) {
3310                 addrconf_addr_gen(idev, false);
3311                 return;
3312         }
3313
3314         sit_add_v4_addrs(idev);
3315
3316         if (dev->flags&IFF_POINTOPOINT)
3317                 addrconf_add_mroute(dev);
3318 }
3319 #endif
3320
3321 #if IS_ENABLED(CONFIG_NET_IPGRE)
3322 static void addrconf_gre_config(struct net_device *dev)
3323 {
3324         struct inet6_dev *idev;
3325
3326         ASSERT_RTNL();
3327
3328         idev = ipv6_find_idev(dev);
3329         if (!idev) {
3330                 pr_debug("%s: add_dev failed\n", __func__);
3331                 return;
3332         }
3333
3334         addrconf_addr_gen(idev, true);
3335         if (dev->flags & IFF_POINTOPOINT)
3336                 addrconf_add_mroute(dev);
3337 }
3338 #endif
3339
3340 static int fixup_permanent_addr(struct net *net,
3341                                 struct inet6_dev *idev,
3342                                 struct inet6_ifaddr *ifp)
3343 {
3344         /* !fib6_node means the host route was removed from the
3345          * FIB, for example, if 'lo' device is taken down. In that
3346          * case regenerate the host route.
3347          */
3348         if (!ifp->rt || !ifp->rt->fib6_node) {
3349                 struct fib6_info *f6i, *prev;
3350
3351                 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3352                                          GFP_ATOMIC);
3353                 if (IS_ERR(f6i))
3354                         return PTR_ERR(f6i);
3355
3356                 /* ifp->rt can be accessed outside of rtnl */
3357                 spin_lock(&ifp->lock);
3358                 prev = ifp->rt;
3359                 ifp->rt = f6i;
3360                 spin_unlock(&ifp->lock);
3361
3362                 fib6_info_release(prev);
3363         }
3364
3365         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3366                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3367                                       idev->dev, 0, 0, GFP_ATOMIC);
3368         }
3369
3370         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3371                 addrconf_dad_start(ifp);
3372
3373         return 0;
3374 }
3375
3376 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3377 {
3378         struct inet6_ifaddr *ifp, *tmp;
3379         struct inet6_dev *idev;
3380
3381         idev = __in6_dev_get(dev);
3382         if (!idev)
3383                 return;
3384
3385         write_lock_bh(&idev->lock);
3386
3387         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3388                 if ((ifp->flags & IFA_F_PERMANENT) &&
3389                     fixup_permanent_addr(net, idev, ifp) < 0) {
3390                         write_unlock_bh(&idev->lock);
3391                         in6_ifa_hold(ifp);
3392                         ipv6_del_addr(ifp);
3393                         write_lock_bh(&idev->lock);
3394
3395                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3396                                              idev->dev->name, &ifp->addr);
3397                 }
3398         }
3399
3400         write_unlock_bh(&idev->lock);
3401 }
3402
3403 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3404                            void *ptr)
3405 {
3406         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3407         struct netdev_notifier_changeupper_info *info;
3408         struct inet6_dev *idev = __in6_dev_get(dev);
3409         struct net *net = dev_net(dev);
3410         int run_pending = 0;
3411         int err;
3412
3413         switch (event) {
3414         case NETDEV_REGISTER:
3415                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3416                         idev = ipv6_add_dev(dev);
3417                         if (IS_ERR(idev))
3418                                 return notifier_from_errno(PTR_ERR(idev));
3419                 }
3420                 break;
3421
3422         case NETDEV_CHANGEMTU:
3423                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3424                 if (dev->mtu < IPV6_MIN_MTU) {
3425                         addrconf_ifdown(dev, dev != net->loopback_dev);
3426                         break;
3427                 }
3428
3429                 if (idev) {
3430                         rt6_mtu_change(dev, dev->mtu);
3431                         idev->cnf.mtu6 = dev->mtu;
3432                         break;
3433                 }
3434
3435                 /* allocate new idev */
3436                 idev = ipv6_add_dev(dev);
3437                 if (IS_ERR(idev))
3438                         break;
3439
3440                 /* device is still not ready */
3441                 if (!(idev->if_flags & IF_READY))
3442                         break;
3443
3444                 run_pending = 1;
3445
3446                 /* fall through */
3447
3448         case NETDEV_UP:
3449         case NETDEV_CHANGE:
3450                 if (dev->flags & IFF_SLAVE)
3451                         break;
3452
3453                 if (idev && idev->cnf.disable_ipv6)
3454                         break;
3455
3456                 if (event == NETDEV_UP) {
3457                         /* restore routes for permanent addresses */
3458                         addrconf_permanent_addr(net, dev);
3459
3460                         if (!addrconf_link_ready(dev)) {
3461                                 /* device is not ready yet. */
3462                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3463                                         dev->name);
3464                                 break;
3465                         }
3466
3467                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3468                                 idev = ipv6_add_dev(dev);
3469
3470                         if (!IS_ERR_OR_NULL(idev)) {
3471                                 idev->if_flags |= IF_READY;
3472                                 run_pending = 1;
3473                         }
3474                 } else if (event == NETDEV_CHANGE) {
3475                         if (!addrconf_link_ready(dev)) {
3476                                 /* device is still not ready. */
3477                                 rt6_sync_down_dev(dev, event);
3478                                 break;
3479                         }
3480
3481                         if (idev) {
3482                                 if (idev->if_flags & IF_READY) {
3483                                         /* device is already configured -
3484                                          * but resend MLD reports, we might
3485                                          * have roamed and need to update
3486                                          * multicast snooping switches
3487                                          */
3488                                         ipv6_mc_up(idev);
3489                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
3490                                         break;
3491                                 }
3492                                 idev->if_flags |= IF_READY;
3493                         }
3494
3495                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3496                                 dev->name);
3497
3498                         run_pending = 1;
3499                 }
3500
3501                 switch (dev->type) {
3502 #if IS_ENABLED(CONFIG_IPV6_SIT)
3503                 case ARPHRD_SIT:
3504                         addrconf_sit_config(dev);
3505                         break;
3506 #endif
3507 #if IS_ENABLED(CONFIG_NET_IPGRE)
3508                 case ARPHRD_IPGRE:
3509                         addrconf_gre_config(dev);
3510                         break;
3511 #endif
3512                 case ARPHRD_LOOPBACK:
3513                         init_loopback(dev);
3514                         break;
3515
3516                 default:
3517                         addrconf_dev_config(dev);
3518                         break;
3519                 }
3520
3521                 if (!IS_ERR_OR_NULL(idev)) {
3522                         if (run_pending)
3523                                 addrconf_dad_run(idev);
3524
3525                         /* Device has an address by now */
3526                         rt6_sync_up(dev, RTNH_F_DEAD);
3527
3528                         /*
3529                          * If the MTU changed during the interface down,
3530                          * when the interface up, the changed MTU must be
3531                          * reflected in the idev as well as routers.
3532                          */
3533                         if (idev->cnf.mtu6 != dev->mtu &&
3534                             dev->mtu >= IPV6_MIN_MTU) {
3535                                 rt6_mtu_change(dev, dev->mtu);
3536                                 idev->cnf.mtu6 = dev->mtu;
3537                         }
3538                         idev->tstamp = jiffies;
3539                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3540
3541                         /*
3542                          * If the changed mtu during down is lower than
3543                          * IPV6_MIN_MTU stop IPv6 on this interface.
3544                          */
3545                         if (dev->mtu < IPV6_MIN_MTU)
3546                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3547                 }
3548                 break;
3549
3550         case NETDEV_DOWN:
3551         case NETDEV_UNREGISTER:
3552                 /*
3553                  *      Remove all addresses from this interface.
3554                  */
3555                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3556                 break;
3557
3558         case NETDEV_CHANGENAME:
3559                 if (idev) {
3560                         snmp6_unregister_dev(idev);
3561                         addrconf_sysctl_unregister(idev);
3562                         err = addrconf_sysctl_register(idev);
3563                         if (err)
3564                                 return notifier_from_errno(err);
3565                         err = snmp6_register_dev(idev);
3566                         if (err) {
3567                                 addrconf_sysctl_unregister(idev);
3568                                 return notifier_from_errno(err);
3569                         }
3570                 }
3571                 break;
3572
3573         case NETDEV_PRE_TYPE_CHANGE:
3574         case NETDEV_POST_TYPE_CHANGE:
3575                 if (idev)
3576                         addrconf_type_change(dev, event);
3577                 break;
3578
3579         case NETDEV_CHANGEUPPER:
3580                 info = ptr;
3581
3582                 /* flush all routes if dev is linked to or unlinked from
3583                  * an L3 master device (e.g., VRF)
3584                  */
3585                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3586                         addrconf_ifdown(dev, 0);
3587         }
3588
3589         return NOTIFY_OK;
3590 }
3591
3592 /*
3593  *      addrconf module should be notified of a device going up
3594  */
3595 static struct notifier_block ipv6_dev_notf = {
3596         .notifier_call = addrconf_notify,
3597         .priority = ADDRCONF_NOTIFY_PRIORITY,
3598 };
3599
3600 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3601 {
3602         struct inet6_dev *idev;
3603         ASSERT_RTNL();
3604
3605         idev = __in6_dev_get(dev);
3606
3607         if (event == NETDEV_POST_TYPE_CHANGE)
3608                 ipv6_mc_remap(idev);
3609         else if (event == NETDEV_PRE_TYPE_CHANGE)
3610                 ipv6_mc_unmap(idev);
3611 }
3612
3613 static bool addr_is_local(const struct in6_addr *addr)
3614 {
3615         return ipv6_addr_type(addr) &
3616                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3617 }
3618
3619 static int addrconf_ifdown(struct net_device *dev, int how)
3620 {
3621         unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3622         struct net *net = dev_net(dev);
3623         struct inet6_dev *idev;
3624         struct inet6_ifaddr *ifa, *tmp;
3625         int _keep_addr;
3626         bool keep_addr;
3627         int state, i;
3628
3629         ASSERT_RTNL();
3630
3631         rt6_disable_ip(dev, event);
3632
3633         idev = __in6_dev_get(dev);
3634         if (!idev)
3635                 return -ENODEV;
3636
3637         /*
3638          * Step 1: remove reference to ipv6 device from parent device.
3639          *         Do not dev_put!
3640          */
3641         if (how) {
3642                 idev->dead = 1;
3643
3644                 /* protected by rtnl_lock */
3645                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3646
3647                 /* Step 1.5: remove snmp6 entry */
3648                 snmp6_unregister_dev(idev);
3649
3650         }
3651
3652         /* aggregate the system setting and interface setting */
3653         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3654         if (!_keep_addr)
3655                 _keep_addr = idev->cnf.keep_addr_on_down;
3656
3657         /* combine the user config with event to determine if permanent
3658          * addresses are to be removed from address hash table
3659          */
3660         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3661
3662         /* Step 2: clear hash table */
3663         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3664                 struct hlist_head *h = &inet6_addr_lst[i];
3665
3666                 spin_lock_bh(&addrconf_hash_lock);
3667 restart:
3668                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3669                         if (ifa->idev == idev) {
3670                                 addrconf_del_dad_work(ifa);
3671                                 /* combined flag + permanent flag decide if
3672                                  * address is retained on a down event
3673                                  */
3674                                 if (!keep_addr ||
3675                                     !(ifa->flags & IFA_F_PERMANENT) ||
3676                                     addr_is_local(&ifa->addr)) {
3677                                         hlist_del_init_rcu(&ifa->addr_lst);
3678                                         goto restart;
3679                                 }
3680                         }
3681                 }
3682                 spin_unlock_bh(&addrconf_hash_lock);
3683         }
3684
3685         write_lock_bh(&idev->lock);
3686
3687         addrconf_del_rs_timer(idev);
3688
3689         /* Step 2: clear flags for stateless addrconf */
3690         if (!how)
3691                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3692
3693         /* Step 3: clear tempaddr list */
3694         while (!list_empty(&idev->tempaddr_list)) {
3695                 ifa = list_first_entry(&idev->tempaddr_list,
3696                                        struct inet6_ifaddr, tmp_list);
3697                 list_del(&ifa->tmp_list);
3698                 write_unlock_bh(&idev->lock);
3699                 spin_lock_bh(&ifa->lock);
3700
3701                 if (ifa->ifpub) {
3702                         in6_ifa_put(ifa->ifpub);
3703                         ifa->ifpub = NULL;
3704                 }
3705                 spin_unlock_bh(&ifa->lock);
3706                 in6_ifa_put(ifa);
3707                 write_lock_bh(&idev->lock);
3708         }
3709
3710         /* re-combine the user config with event to determine if permanent
3711          * addresses are to be removed from the interface list
3712          */
3713         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3714
3715         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3716                 struct fib6_info *rt = NULL;
3717                 bool keep;
3718
3719                 addrconf_del_dad_work(ifa);
3720
3721                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3722                         !addr_is_local(&ifa->addr);
3723
3724                 write_unlock_bh(&idev->lock);
3725                 spin_lock_bh(&ifa->lock);
3726
3727                 if (keep) {
3728                         /* set state to skip the notifier below */
3729                         state = INET6_IFADDR_STATE_DEAD;
3730                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3731                         if (!(ifa->flags & IFA_F_NODAD))
3732                                 ifa->flags |= IFA_F_TENTATIVE;
3733
3734                         rt = ifa->rt;
3735                         ifa->rt = NULL;
3736                 } else {
3737                         state = ifa->state;
3738                         ifa->state = INET6_IFADDR_STATE_DEAD;
3739                 }
3740
3741                 spin_unlock_bh(&ifa->lock);
3742
3743                 if (rt)
3744                         ip6_del_rt(net, rt);
3745
3746                 if (state != INET6_IFADDR_STATE_DEAD) {
3747                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3748                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3749                 } else {
3750                         if (idev->cnf.forwarding)
3751                                 addrconf_leave_anycast(ifa);
3752                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3753                 }
3754
3755                 write_lock_bh(&idev->lock);
3756                 if (!keep) {
3757                         list_del_rcu(&ifa->if_list);
3758                         in6_ifa_put(ifa);
3759                 }
3760         }
3761
3762         write_unlock_bh(&idev->lock);
3763
3764         /* Step 5: Discard anycast and multicast list */
3765         if (how) {
3766                 ipv6_ac_destroy_dev(idev);
3767                 ipv6_mc_destroy_dev(idev);
3768         } else {
3769                 ipv6_mc_down(idev);
3770         }
3771
3772         idev->tstamp = jiffies;
3773
3774         /* Last: Shot the device (if unregistered) */
3775         if (how) {
3776                 addrconf_sysctl_unregister(idev);
3777                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3778                 neigh_ifdown(&nd_tbl, dev);
3779                 in6_dev_put(idev);
3780         }
3781         return 0;
3782 }
3783
3784 static void addrconf_rs_timer(struct timer_list *t)
3785 {
3786         struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3787         struct net_device *dev = idev->dev;
3788         struct in6_addr lladdr;
3789
3790         write_lock(&idev->lock);
3791         if (idev->dead || !(idev->if_flags & IF_READY))
3792                 goto out;
3793
3794         if (!ipv6_accept_ra(idev))
3795                 goto out;
3796
3797         /* Announcement received after solicitation was sent */
3798         if (idev->if_flags & IF_RA_RCVD)
3799                 goto out;
3800
3801         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3802                 write_unlock(&idev->lock);
3803                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3804                         ndisc_send_rs(dev, &lladdr,
3805                                       &in6addr_linklocal_allrouters);
3806                 else
3807                         goto put;
3808
3809                 write_lock(&idev->lock);
3810                 idev->rs_interval = rfc3315_s14_backoff_update(
3811                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3812                 /* The wait after the last probe can be shorter */
3813                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3814                                              idev->cnf.rtr_solicits) ?
3815                                       idev->cnf.rtr_solicit_delay :
3816                                       idev->rs_interval);
3817         } else {
3818                 /*
3819                  * Note: we do not support deprecated "all on-link"
3820                  * assumption any longer.
3821                  */
3822                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3823         }
3824
3825 out:
3826         write_unlock(&idev->lock);
3827 put:
3828         in6_dev_put(idev);
3829 }
3830
3831 /*
3832  *      Duplicate Address Detection
3833  */
3834 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3835 {
3836         unsigned long rand_num;
3837         struct inet6_dev *idev = ifp->idev;
3838         u64 nonce;
3839
3840         if (ifp->flags & IFA_F_OPTIMISTIC)
3841                 rand_num = 0;
3842         else
3843                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3844
3845         nonce = 0;
3846         if (idev->cnf.enhanced_dad ||
3847             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3848                 do
3849                         get_random_bytes(&nonce, 6);
3850                 while (nonce == 0);
3851         }
3852         ifp->dad_nonce = nonce;
3853         ifp->dad_probes = idev->cnf.dad_transmits;
3854         addrconf_mod_dad_work(ifp, rand_num);
3855 }
3856
3857 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3858 {
3859         struct inet6_dev *idev = ifp->idev;
3860         struct net_device *dev = idev->dev;
3861         bool bump_id, notify = false;
3862         struct net *net;
3863
3864         addrconf_join_solict(dev, &ifp->addr);
3865
3866         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3867
3868         read_lock_bh(&idev->lock);
3869         spin_lock(&ifp->lock);
3870         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3871                 goto out;
3872
3873         net = dev_net(dev);
3874         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3875             (net->ipv6.devconf_all->accept_dad < 1 &&
3876              idev->cnf.accept_dad < 1) ||
3877             !(ifp->flags&IFA_F_TENTATIVE) ||
3878             ifp->flags & IFA_F_NODAD) {
3879                 bool send_na = false;
3880
3881                 if (ifp->flags & IFA_F_TENTATIVE &&
3882                     !(ifp->flags & IFA_F_OPTIMISTIC))
3883                         send_na = true;
3884                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3885                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3886                 spin_unlock(&ifp->lock);
3887                 read_unlock_bh(&idev->lock);
3888
3889                 addrconf_dad_completed(ifp, bump_id, send_na);
3890                 return;
3891         }
3892
3893         if (!(idev->if_flags & IF_READY)) {
3894                 spin_unlock(&ifp->lock);
3895                 read_unlock_bh(&idev->lock);
3896                 /*
3897                  * If the device is not ready:
3898                  * - keep it tentative if it is a permanent address.
3899                  * - otherwise, kill it.
3900                  */
3901                 in6_ifa_hold(ifp);
3902                 addrconf_dad_stop(ifp, 0);
3903                 return;
3904         }
3905
3906         /*
3907          * Optimistic nodes can start receiving
3908          * Frames right away
3909          */
3910         if (ifp->flags & IFA_F_OPTIMISTIC) {
3911                 ip6_ins_rt(net, ifp->rt);
3912                 if (ipv6_use_optimistic_addr(net, idev)) {
3913                         /* Because optimistic nodes can use this address,
3914                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3915                          */
3916                         notify = true;
3917                 }
3918         }
3919
3920         addrconf_dad_kick(ifp);
3921 out:
3922         spin_unlock(&ifp->lock);
3923         read_unlock_bh(&idev->lock);
3924         if (notify)
3925                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3926 }
3927
3928 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3929 {
3930         bool begin_dad = false;
3931
3932         spin_lock_bh(&ifp->lock);
3933         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3934                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3935                 begin_dad = true;
3936         }
3937         spin_unlock_bh(&ifp->lock);
3938
3939         if (begin_dad)
3940                 addrconf_mod_dad_work(ifp, 0);
3941 }
3942
3943 static void addrconf_dad_work(struct work_struct *w)
3944 {
3945         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3946                                                 struct inet6_ifaddr,
3947                                                 dad_work);
3948         struct inet6_dev *idev = ifp->idev;
3949         bool bump_id, disable_ipv6 = false;
3950         struct in6_addr mcaddr;
3951
3952         enum {
3953                 DAD_PROCESS,
3954                 DAD_BEGIN,
3955                 DAD_ABORT,
3956         } action = DAD_PROCESS;
3957
3958         rtnl_lock();
3959
3960         spin_lock_bh(&ifp->lock);
3961         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3962                 action = DAD_BEGIN;
3963                 ifp->state = INET6_IFADDR_STATE_DAD;
3964         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3965                 action = DAD_ABORT;
3966                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3967
3968                 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3969                      idev->cnf.accept_dad > 1) &&
3970                     !idev->cnf.disable_ipv6 &&
3971                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3972                         struct in6_addr addr;
3973
3974                         addr.s6_addr32[0] = htonl(0xfe800000);
3975                         addr.s6_addr32[1] = 0;
3976
3977                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3978                             ipv6_addr_equal(&ifp->addr, &addr)) {
3979                                 /* DAD failed for link-local based on MAC */
3980                                 idev->cnf.disable_ipv6 = 1;
3981
3982                                 pr_info("%s: IPv6 being disabled!\n",
3983                                         ifp->idev->dev->name);
3984                                 disable_ipv6 = true;
3985                         }
3986                 }
3987         }
3988         spin_unlock_bh(&ifp->lock);
3989
3990         if (action == DAD_BEGIN) {
3991                 addrconf_dad_begin(ifp);
3992                 goto out;
3993         } else if (action == DAD_ABORT) {
3994                 in6_ifa_hold(ifp);
3995                 addrconf_dad_stop(ifp, 1);
3996                 if (disable_ipv6)
3997                         addrconf_ifdown(idev->dev, 0);
3998                 goto out;
3999         }
4000
4001         if (!ifp->dad_probes && addrconf_dad_end(ifp))
4002                 goto out;
4003
4004         write_lock_bh(&idev->lock);
4005         if (idev->dead || !(idev->if_flags & IF_READY)) {
4006                 write_unlock_bh(&idev->lock);
4007                 goto out;
4008         }
4009
4010         spin_lock(&ifp->lock);
4011         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4012                 spin_unlock(&ifp->lock);
4013                 write_unlock_bh(&idev->lock);
4014                 goto out;
4015         }
4016
4017         if (ifp->dad_probes == 0) {
4018                 bool send_na = false;
4019
4020                 /*
4021                  * DAD was successful
4022                  */
4023
4024                 if (ifp->flags & IFA_F_TENTATIVE &&
4025                     !(ifp->flags & IFA_F_OPTIMISTIC))
4026                         send_na = true;
4027                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4028                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4029                 spin_unlock(&ifp->lock);
4030                 write_unlock_bh(&idev->lock);
4031
4032                 addrconf_dad_completed(ifp, bump_id, send_na);
4033
4034                 goto out;
4035         }
4036
4037         ifp->dad_probes--;
4038         addrconf_mod_dad_work(ifp,
4039                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4040         spin_unlock(&ifp->lock);
4041         write_unlock_bh(&idev->lock);
4042
4043         /* send a neighbour solicitation for our addr */
4044         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4045         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4046                       ifp->dad_nonce);
4047 out:
4048         in6_ifa_put(ifp);
4049         rtnl_unlock();
4050 }
4051
4052 /* ifp->idev must be at least read locked */
4053 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4054 {
4055         struct inet6_ifaddr *ifpiter;
4056         struct inet6_dev *idev = ifp->idev;
4057
4058         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4059                 if (ifpiter->scope > IFA_LINK)
4060                         break;
4061                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4062                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4063                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4064                     IFA_F_PERMANENT)
4065                         return false;
4066         }
4067         return true;
4068 }
4069
4070 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4071                                    bool send_na)
4072 {
4073         struct net_device *dev = ifp->idev->dev;
4074         struct in6_addr lladdr;
4075         bool send_rs, send_mld;
4076
4077         addrconf_del_dad_work(ifp);
4078
4079         /*
4080          *      Configure the address for reception. Now it is valid.
4081          */
4082
4083         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4084
4085         /* If added prefix is link local and we are prepared to process
4086            router advertisements, start sending router solicitations.
4087          */
4088
4089         read_lock_bh(&ifp->idev->lock);
4090         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4091         send_rs = send_mld &&
4092                   ipv6_accept_ra(ifp->idev) &&
4093                   ifp->idev->cnf.rtr_solicits != 0 &&
4094                   (dev->flags&IFF_LOOPBACK) == 0;
4095         read_unlock_bh(&ifp->idev->lock);
4096
4097         /* While dad is in progress mld report's source address is in6_addrany.
4098          * Resend with proper ll now.
4099          */
4100         if (send_mld)
4101                 ipv6_mc_dad_complete(ifp->idev);
4102
4103         /* send unsolicited NA if enabled */
4104         if (send_na &&
4105             (ifp->idev->cnf.ndisc_notify ||
4106              dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4107                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4108                               /*router=*/ !!ifp->idev->cnf.forwarding,
4109                               /*solicited=*/ false, /*override=*/ true,
4110                               /*inc_opt=*/ true);
4111         }
4112
4113         if (send_rs) {
4114                 /*
4115                  *      If a host as already performed a random delay
4116                  *      [...] as part of DAD [...] there is no need
4117                  *      to delay again before sending the first RS
4118                  */
4119                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4120                         return;
4121                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4122
4123                 write_lock_bh(&ifp->idev->lock);
4124                 spin_lock(&ifp->lock);
4125                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4126                         ifp->idev->cnf.rtr_solicit_interval);
4127                 ifp->idev->rs_probes = 1;
4128                 ifp->idev->if_flags |= IF_RS_SENT;
4129                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4130                 spin_unlock(&ifp->lock);
4131                 write_unlock_bh(&ifp->idev->lock);
4132         }
4133
4134         if (bump_id)
4135                 rt_genid_bump_ipv6(dev_net(dev));
4136
4137         /* Make sure that a new temporary address will be created
4138          * before this temporary address becomes deprecated.
4139          */
4140         if (ifp->flags & IFA_F_TEMPORARY)
4141                 addrconf_verify_rtnl();
4142 }
4143
4144 static void addrconf_dad_run(struct inet6_dev *idev)
4145 {
4146         struct inet6_ifaddr *ifp;
4147
4148         read_lock_bh(&idev->lock);
4149         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4150                 spin_lock(&ifp->lock);
4151                 if (ifp->flags & IFA_F_TENTATIVE &&
4152                     ifp->state == INET6_IFADDR_STATE_DAD)
4153                         addrconf_dad_kick(ifp);
4154                 spin_unlock(&ifp->lock);
4155         }
4156         read_unlock_bh(&idev->lock);
4157 }
4158
4159 #ifdef CONFIG_PROC_FS
4160 struct if6_iter_state {
4161         struct seq_net_private p;
4162         int bucket;
4163         int offset;
4164 };
4165
4166 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4167 {
4168         struct if6_iter_state *state = seq->private;
4169         struct net *net = seq_file_net(seq);
4170         struct inet6_ifaddr *ifa = NULL;
4171         int p = 0;
4172
4173         /* initial bucket if pos is 0 */
4174         if (pos == 0) {
4175                 state->bucket = 0;
4176                 state->offset = 0;
4177         }
4178
4179         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4180                 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4181                                          addr_lst) {
4182                         if (!net_eq(dev_net(ifa->idev->dev), net))
4183                                 continue;
4184                         /* sync with offset */
4185                         if (p < state->offset) {
4186                                 p++;
4187                                 continue;
4188                         }
4189                         state->offset++;
4190                         return ifa;
4191                 }
4192
4193                 /* prepare for next bucket */
4194                 state->offset = 0;
4195                 p = 0;
4196         }
4197         return NULL;
4198 }
4199
4200 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4201                                          struct inet6_ifaddr *ifa)
4202 {
4203         struct if6_iter_state *state = seq->private;
4204         struct net *net = seq_file_net(seq);
4205
4206         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4207                 if (!net_eq(dev_net(ifa->idev->dev), net))
4208                         continue;
4209                 state->offset++;
4210                 return ifa;
4211         }
4212
4213         while (++state->bucket < IN6_ADDR_HSIZE) {
4214                 state->offset = 0;
4215                 hlist_for_each_entry_rcu(ifa,
4216                                      &inet6_addr_lst[state->bucket], addr_lst) {
4217                         if (!net_eq(dev_net(ifa->idev->dev), net))
4218                                 continue;
4219                         state->offset++;
4220                         return ifa;
4221                 }
4222         }
4223
4224         return NULL;
4225 }
4226
4227 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4228         __acquires(rcu)
4229 {
4230         rcu_read_lock();
4231         return if6_get_first(seq, *pos);
4232 }
4233
4234 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4235 {
4236         struct inet6_ifaddr *ifa;
4237
4238         ifa = if6_get_next(seq, v);
4239         ++*pos;
4240         return ifa;
4241 }
4242
4243 static void if6_seq_stop(struct seq_file *seq, void *v)
4244         __releases(rcu)
4245 {
4246         rcu_read_unlock();
4247 }
4248
4249 static int if6_seq_show(struct seq_file *seq, void *v)
4250 {
4251         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4252         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4253                    &ifp->addr,
4254                    ifp->idev->dev->ifindex,
4255                    ifp->prefix_len,
4256                    ifp->scope,
4257                    (u8) ifp->flags,
4258                    ifp->idev->dev->name);
4259         return 0;
4260 }
4261
4262 static const struct seq_operations if6_seq_ops = {
4263         .start  = if6_seq_start,
4264         .next   = if6_seq_next,
4265         .show   = if6_seq_show,
4266         .stop   = if6_seq_stop,
4267 };
4268
4269 static int if6_seq_open(struct inode *inode, struct file *file)
4270 {
4271         return seq_open_net(inode, file, &if6_seq_ops,
4272                             sizeof(struct if6_iter_state));
4273 }
4274
4275 static const struct file_operations if6_fops = {
4276         .open           = if6_seq_open,
4277         .read           = seq_read,
4278         .llseek         = seq_lseek,
4279         .release        = seq_release_net,
4280 };
4281
4282 static int __net_init if6_proc_net_init(struct net *net)
4283 {
4284         if (!proc_create("if_inet6", 0444, net->proc_net, &if6_fops))
4285                 return -ENOMEM;
4286         return 0;
4287 }
4288
4289 static void __net_exit if6_proc_net_exit(struct net *net)
4290 {
4291         remove_proc_entry("if_inet6", net->proc_net);
4292 }
4293
4294 static struct pernet_operations if6_proc_net_ops = {
4295         .init = if6_proc_net_init,
4296         .exit = if6_proc_net_exit,
4297 };
4298
4299 int __init if6_proc_init(void)
4300 {
4301         return register_pernet_subsys(&if6_proc_net_ops);
4302 }
4303
4304 void if6_proc_exit(void)
4305 {
4306         unregister_pernet_subsys(&if6_proc_net_ops);
4307 }
4308 #endif  /* CONFIG_PROC_FS */
4309
4310 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4311 /* Check if address is a home address configured on any interface. */
4312 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4313 {
4314         unsigned int hash = inet6_addr_hash(net, addr);
4315         struct inet6_ifaddr *ifp = NULL;
4316         int ret = 0;
4317
4318         rcu_read_lock();
4319         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4320                 if (!net_eq(dev_net(ifp->idev->dev), net))
4321                         continue;
4322                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4323                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4324                         ret = 1;
4325                         break;
4326                 }
4327         }
4328         rcu_read_unlock();
4329         return ret;
4330 }
4331 #endif
4332
4333 /*
4334  *      Periodic address status verification
4335  */
4336
4337 static void addrconf_verify_rtnl(void)
4338 {
4339         unsigned long now, next, next_sec, next_sched;
4340         struct inet6_ifaddr *ifp;
4341         int i;
4342
4343         ASSERT_RTNL();
4344
4345         rcu_read_lock_bh();
4346         now = jiffies;
4347         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4348
4349         cancel_delayed_work(&addr_chk_work);
4350
4351         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4352 restart:
4353                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4354                         unsigned long age;
4355
4356                         /* When setting preferred_lft to a value not zero or
4357                          * infinity, while valid_lft is infinity
4358                          * IFA_F_PERMANENT has a non-infinity life time.
4359                          */
4360                         if ((ifp->flags & IFA_F_PERMANENT) &&
4361                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4362                                 continue;
4363
4364                         spin_lock(&ifp->lock);
4365                         /* We try to batch several events at once. */
4366                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4367
4368                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4369                             age >= ifp->valid_lft) {
4370                                 spin_unlock(&ifp->lock);
4371                                 in6_ifa_hold(ifp);
4372                                 ipv6_del_addr(ifp);
4373                                 goto restart;
4374                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4375                                 spin_unlock(&ifp->lock);
4376                                 continue;
4377                         } else if (age >= ifp->prefered_lft) {
4378                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4379                                 int deprecate = 0;
4380
4381                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4382                                         deprecate = 1;
4383                                         ifp->flags |= IFA_F_DEPRECATED;
4384                                 }
4385
4386                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4387                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4388                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4389
4390                                 spin_unlock(&ifp->lock);
4391
4392                                 if (deprecate) {
4393                                         in6_ifa_hold(ifp);
4394
4395                                         ipv6_ifa_notify(0, ifp);
4396                                         in6_ifa_put(ifp);
4397                                         goto restart;
4398                                 }
4399                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4400                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4401                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4402                                         ifp->idev->cnf.dad_transmits *
4403                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4404
4405                                 if (age >= ifp->prefered_lft - regen_advance) {
4406                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4407                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4408                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4409                                         if (!ifp->regen_count && ifpub) {
4410                                                 ifp->regen_count++;
4411                                                 in6_ifa_hold(ifp);
4412                                                 in6_ifa_hold(ifpub);
4413                                                 spin_unlock(&ifp->lock);
4414
4415                                                 spin_lock(&ifpub->lock);
4416                                                 ifpub->regen_count = 0;
4417                                                 spin_unlock(&ifpub->lock);
4418                                                 rcu_read_unlock_bh();
4419                                                 ipv6_create_tempaddr(ifpub, ifp, true);
4420                                                 in6_ifa_put(ifpub);
4421                                                 in6_ifa_put(ifp);
4422                                                 rcu_read_lock_bh();
4423                                                 goto restart;
4424                                         }
4425                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4426                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4427                                 spin_unlock(&ifp->lock);
4428                         } else {
4429                                 /* ifp->prefered_lft <= ifp->valid_lft */
4430                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4431                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4432                                 spin_unlock(&ifp->lock);
4433                         }
4434                 }
4435         }
4436
4437         next_sec = round_jiffies_up(next);
4438         next_sched = next;
4439
4440         /* If rounded timeout is accurate enough, accept it. */
4441         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4442                 next_sched = next_sec;
4443
4444         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4445         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4446                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4447
4448         pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4449                  now, next, next_sec, next_sched);
4450         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4451         rcu_read_unlock_bh();
4452 }
4453
4454 static void addrconf_verify_work(struct work_struct *w)
4455 {
4456         rtnl_lock();
4457         addrconf_verify_rtnl();
4458         rtnl_unlock();
4459 }
4460
4461 static void addrconf_verify(void)
4462 {
4463         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4464 }
4465
4466 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4467                                      struct in6_addr **peer_pfx)
4468 {
4469         struct in6_addr *pfx = NULL;
4470
4471         *peer_pfx = NULL;
4472
4473         if (addr)
4474                 pfx = nla_data(addr);
4475
4476         if (local) {
4477                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4478                         *peer_pfx = pfx;
4479                 pfx = nla_data(local);
4480         }
4481
4482         return pfx;
4483 }
4484
4485 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4486         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4487         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4488         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4489         [IFA_FLAGS]             = { .len = sizeof(u32) },
4490 };
4491
4492 static int
4493 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4494                   struct netlink_ext_ack *extack)
4495 {
4496         struct net *net = sock_net(skb->sk);
4497         struct ifaddrmsg *ifm;
4498         struct nlattr *tb[IFA_MAX+1];
4499         struct in6_addr *pfx, *peer_pfx;
4500         u32 ifa_flags;
4501         int err;
4502
4503         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4504                           extack);
4505         if (err < 0)
4506                 return err;
4507
4508         ifm = nlmsg_data(nlh);
4509         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4510         if (!pfx)
4511                 return -EINVAL;
4512
4513         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4514
4515         /* We ignore other flags so far. */
4516         ifa_flags &= IFA_F_MANAGETEMPADDR;
4517
4518         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4519                               ifm->ifa_prefixlen);
4520 }
4521
4522 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4523                              u32 prefered_lft, u32 valid_lft)
4524 {
4525         u32 flags;
4526         clock_t expires;
4527         unsigned long timeout;
4528         bool was_managetempaddr;
4529         bool had_prefixroute;
4530
4531         ASSERT_RTNL();
4532
4533         if (!valid_lft || (prefered_lft > valid_lft))
4534                 return -EINVAL;
4535
4536         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4537             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4538                 return -EINVAL;
4539
4540         if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4541                 ifa_flags &= ~IFA_F_OPTIMISTIC;
4542
4543         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4544         if (addrconf_finite_timeout(timeout)) {
4545                 expires = jiffies_to_clock_t(timeout * HZ);
4546                 valid_lft = timeout;
4547                 flags = RTF_EXPIRES;
4548         } else {
4549                 expires = 0;
4550                 flags = 0;
4551                 ifa_flags |= IFA_F_PERMANENT;
4552         }
4553
4554         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4555         if (addrconf_finite_timeout(timeout)) {
4556                 if (timeout == 0)
4557                         ifa_flags |= IFA_F_DEPRECATED;
4558                 prefered_lft = timeout;
4559         }
4560
4561         spin_lock_bh(&ifp->lock);
4562         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4563         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4564                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4565         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4566                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4567                         IFA_F_NOPREFIXROUTE);
4568         ifp->flags |= ifa_flags;
4569         ifp->tstamp = jiffies;
4570         ifp->valid_lft = valid_lft;
4571         ifp->prefered_lft = prefered_lft;
4572
4573         spin_unlock_bh(&ifp->lock);
4574         if (!(ifp->flags&IFA_F_TENTATIVE))
4575                 ipv6_ifa_notify(0, ifp);
4576
4577         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4578                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4579                                       ifp->idev->dev, expires, flags,
4580                                       GFP_KERNEL);
4581         } else if (had_prefixroute) {
4582                 enum cleanup_prefix_rt_t action;
4583                 unsigned long rt_expires;
4584
4585                 write_lock_bh(&ifp->idev->lock);
4586                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4587                 write_unlock_bh(&ifp->idev->lock);
4588
4589                 if (action != CLEANUP_PREFIX_RT_NOP) {
4590                         cleanup_prefix_route(ifp, rt_expires,
4591                                 action == CLEANUP_PREFIX_RT_DEL);
4592                 }
4593         }
4594
4595         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4596                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4597                         valid_lft = prefered_lft = 0;
4598                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4599                                  !was_managetempaddr, jiffies);
4600         }
4601
4602         addrconf_verify_rtnl();
4603
4604         return 0;
4605 }
4606
4607 static int
4608 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4609                   struct netlink_ext_ack *extack)
4610 {
4611         struct net *net = sock_net(skb->sk);
4612         struct ifaddrmsg *ifm;
4613         struct nlattr *tb[IFA_MAX+1];
4614         struct in6_addr *pfx, *peer_pfx;
4615         struct inet6_ifaddr *ifa;
4616         struct net_device *dev;
4617         struct inet6_dev *idev;
4618         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4619         u32 ifa_flags;
4620         int err;
4621
4622         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4623                           extack);
4624         if (err < 0)
4625                 return err;
4626
4627         ifm = nlmsg_data(nlh);
4628         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4629         if (!pfx)
4630                 return -EINVAL;
4631
4632         if (tb[IFA_CACHEINFO]) {
4633                 struct ifa_cacheinfo *ci;
4634
4635                 ci = nla_data(tb[IFA_CACHEINFO]);
4636                 valid_lft = ci->ifa_valid;
4637                 preferred_lft = ci->ifa_prefered;
4638         } else {
4639                 preferred_lft = INFINITY_LIFE_TIME;
4640                 valid_lft = INFINITY_LIFE_TIME;
4641         }
4642
4643         dev =  __dev_get_by_index(net, ifm->ifa_index);
4644         if (!dev)
4645                 return -ENODEV;
4646
4647         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4648
4649         /* We ignore other flags so far. */
4650         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4651                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4652
4653         idev = ipv6_find_idev(dev);
4654         if (IS_ERR(idev))
4655                 return PTR_ERR(idev);
4656
4657         if (!ipv6_allow_optimistic_dad(net, idev))
4658                 ifa_flags &= ~IFA_F_OPTIMISTIC;
4659
4660         if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) {
4661                 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4662                 return -EINVAL;
4663         }
4664
4665         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4666         if (!ifa) {
4667                 /*
4668                  * It would be best to check for !NLM_F_CREATE here but
4669                  * userspace already relies on not having to provide this.
4670                  */
4671                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4672                                       ifm->ifa_prefixlen, ifa_flags,
4673                                       preferred_lft, valid_lft, extack);
4674         }
4675
4676         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4677             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4678                 err = -EEXIST;
4679         else
4680                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4681
4682         in6_ifa_put(ifa);
4683
4684         return err;
4685 }
4686
4687 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4688                           u8 scope, int ifindex)
4689 {
4690         struct ifaddrmsg *ifm;
4691
4692         ifm = nlmsg_data(nlh);
4693         ifm->ifa_family = AF_INET6;
4694         ifm->ifa_prefixlen = prefixlen;
4695         ifm->ifa_flags = flags;
4696         ifm->ifa_scope = scope;
4697         ifm->ifa_index = ifindex;
4698 }
4699
4700 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4701                          unsigned long tstamp, u32 preferred, u32 valid)
4702 {
4703         struct ifa_cacheinfo ci;
4704
4705         ci.cstamp = cstamp_delta(cstamp);
4706         ci.tstamp = cstamp_delta(tstamp);
4707         ci.ifa_prefered = preferred;
4708         ci.ifa_valid = valid;
4709
4710         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4711 }
4712
4713 static inline int rt_scope(int ifa_scope)
4714 {
4715         if (ifa_scope & IFA_HOST)
4716                 return RT_SCOPE_HOST;
4717         else if (ifa_scope & IFA_LINK)
4718                 return RT_SCOPE_LINK;
4719         else if (ifa_scope & IFA_SITE)
4720                 return RT_SCOPE_SITE;
4721         else
4722                 return RT_SCOPE_UNIVERSE;
4723 }
4724
4725 static inline int inet6_ifaddr_msgsize(void)
4726 {
4727         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4728                + nla_total_size(16) /* IFA_LOCAL */
4729                + nla_total_size(16) /* IFA_ADDRESS */
4730                + nla_total_size(sizeof(struct ifa_cacheinfo))
4731                + nla_total_size(4)  /* IFA_FLAGS */;
4732 }
4733
4734 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4735                              u32 portid, u32 seq, int event, unsigned int flags)
4736 {
4737         struct nlmsghdr  *nlh;
4738         u32 preferred, valid;
4739
4740         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4741         if (!nlh)
4742                 return -EMSGSIZE;
4743
4744         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4745                       ifa->idev->dev->ifindex);
4746
4747         if (!((ifa->flags&IFA_F_PERMANENT) &&
4748               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4749                 preferred = ifa->prefered_lft;
4750                 valid = ifa->valid_lft;
4751                 if (preferred != INFINITY_LIFE_TIME) {
4752                         long tval = (jiffies - ifa->tstamp)/HZ;
4753                         if (preferred > tval)
4754                                 preferred -= tval;
4755                         else
4756                                 preferred = 0;
4757                         if (valid != INFINITY_LIFE_TIME) {
4758                                 if (valid > tval)
4759                                         valid -= tval;
4760                                 else
4761                                         valid = 0;
4762                         }
4763                 }
4764         } else {
4765                 preferred = INFINITY_LIFE_TIME;
4766                 valid = INFINITY_LIFE_TIME;
4767         }
4768
4769         if (!ipv6_addr_any(&ifa->peer_addr)) {
4770                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4771                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4772                         goto error;
4773         } else
4774                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4775                         goto error;
4776
4777         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4778                 goto error;
4779
4780         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4781                 goto error;
4782
4783         nlmsg_end(skb, nlh);
4784         return 0;
4785
4786 error:
4787         nlmsg_cancel(skb, nlh);
4788         return -EMSGSIZE;
4789 }
4790
4791 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4792                                 u32 portid, u32 seq, int event, u16 flags)
4793 {
4794         struct nlmsghdr  *nlh;
4795         u8 scope = RT_SCOPE_UNIVERSE;
4796         int ifindex = ifmca->idev->dev->ifindex;
4797
4798         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4799                 scope = RT_SCOPE_SITE;
4800
4801         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4802         if (!nlh)
4803                 return -EMSGSIZE;
4804
4805         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4806         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4807             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4808                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4809                 nlmsg_cancel(skb, nlh);
4810                 return -EMSGSIZE;
4811         }
4812
4813         nlmsg_end(skb, nlh);
4814         return 0;
4815 }
4816
4817 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4818                                 u32 portid, u32 seq, int event, unsigned int flags)
4819 {
4820         struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4821         int ifindex = dev ? dev->ifindex : 1;
4822         struct nlmsghdr  *nlh;
4823         u8 scope = RT_SCOPE_UNIVERSE;
4824
4825         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4826                 scope = RT_SCOPE_SITE;
4827
4828         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4829         if (!nlh)
4830                 return -EMSGSIZE;
4831
4832         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4833         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4834             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4835                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4836                 nlmsg_cancel(skb, nlh);
4837                 return -EMSGSIZE;
4838         }
4839
4840         nlmsg_end(skb, nlh);
4841         return 0;
4842 }
4843
4844 enum addr_type_t {
4845         UNICAST_ADDR,
4846         MULTICAST_ADDR,
4847         ANYCAST_ADDR,
4848 };
4849
4850 /* called with rcu_read_lock() */
4851 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4852                           struct netlink_callback *cb, enum addr_type_t type,
4853                           int s_ip_idx, int *p_ip_idx)
4854 {
4855         struct ifmcaddr6 *ifmca;
4856         struct ifacaddr6 *ifaca;
4857         int err = 1;
4858         int ip_idx = *p_ip_idx;
4859
4860         read_lock_bh(&idev->lock);
4861         switch (type) {
4862         case UNICAST_ADDR: {
4863                 struct inet6_ifaddr *ifa;
4864
4865                 /* unicast address incl. temp addr */
4866                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4867                         if (++ip_idx < s_ip_idx)
4868                                 continue;
4869                         err = inet6_fill_ifaddr(skb, ifa,
4870                                                 NETLINK_CB(cb->skb).portid,
4871                                                 cb->nlh->nlmsg_seq,
4872                                                 RTM_NEWADDR,
4873                                                 NLM_F_MULTI);
4874                         if (err < 0)
4875                                 break;
4876                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4877                 }
4878                 break;
4879         }
4880         case MULTICAST_ADDR:
4881                 /* multicast address */
4882                 for (ifmca = idev->mc_list; ifmca;
4883                      ifmca = ifmca->next, ip_idx++) {
4884                         if (ip_idx < s_ip_idx)
4885                                 continue;
4886                         err = inet6_fill_ifmcaddr(skb, ifmca,
4887                                                   NETLINK_CB(cb->skb).portid,
4888                                                   cb->nlh->nlmsg_seq,
4889                                                   RTM_GETMULTICAST,
4890                                                   NLM_F_MULTI);
4891                         if (err < 0)
4892                                 break;
4893                 }
4894                 break;
4895         case ANYCAST_ADDR:
4896                 /* anycast address */
4897                 for (ifaca = idev->ac_list; ifaca;
4898                      ifaca = ifaca->aca_next, ip_idx++) {
4899                         if (ip_idx < s_ip_idx)
4900                                 continue;
4901                         err = inet6_fill_ifacaddr(skb, ifaca,
4902                                                   NETLINK_CB(cb->skb).portid,
4903                                                   cb->nlh->nlmsg_seq,
4904                                                   RTM_GETANYCAST,
4905                                                   NLM_F_MULTI);
4906                         if (err < 0)
4907                                 break;
4908                 }
4909                 break;
4910         default:
4911                 break;
4912         }
4913         read_unlock_bh(&idev->lock);
4914         *p_ip_idx = ip_idx;
4915         return err;
4916 }
4917
4918 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4919                            enum addr_type_t type)
4920 {
4921         struct net *net = sock_net(skb->sk);
4922         int h, s_h;
4923         int idx, ip_idx;
4924         int s_idx, s_ip_idx;
4925         struct net_device *dev;
4926         struct inet6_dev *idev;
4927         struct hlist_head *head;
4928
4929         s_h = cb->args[0];
4930         s_idx = idx = cb->args[1];
4931         s_ip_idx = ip_idx = cb->args[2];
4932
4933         rcu_read_lock();
4934         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4935         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4936                 idx = 0;
4937                 head = &net->dev_index_head[h];
4938                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4939                         if (idx < s_idx)
4940                                 goto cont;
4941                         if (h > s_h || idx > s_idx)
4942                                 s_ip_idx = 0;
4943                         ip_idx = 0;
4944                         idev = __in6_dev_get(dev);
4945                         if (!idev)
4946                                 goto cont;
4947
4948                         if (in6_dump_addrs(idev, skb, cb, type,
4949                                            s_ip_idx, &ip_idx) < 0)
4950                                 goto done;
4951 cont:
4952                         idx++;
4953                 }
4954         }
4955 done:
4956         rcu_read_unlock();
4957         cb->args[0] = h;
4958         cb->args[1] = idx;
4959         cb->args[2] = ip_idx;
4960
4961         return skb->len;
4962 }
4963
4964 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4965 {
4966         enum addr_type_t type = UNICAST_ADDR;
4967
4968         return inet6_dump_addr(skb, cb, type);
4969 }
4970
4971 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4972 {
4973         enum addr_type_t type = MULTICAST_ADDR;
4974
4975         return inet6_dump_addr(skb, cb, type);
4976 }
4977
4978
4979 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4980 {
4981         enum addr_type_t type = ANYCAST_ADDR;
4982
4983         return inet6_dump_addr(skb, cb, type);
4984 }
4985
4986 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4987                              struct netlink_ext_ack *extack)
4988 {
4989         struct net *net = sock_net(in_skb->sk);
4990         struct ifaddrmsg *ifm;
4991         struct nlattr *tb[IFA_MAX+1];
4992         struct in6_addr *addr = NULL, *peer;
4993         struct net_device *dev = NULL;
4994         struct inet6_ifaddr *ifa;
4995         struct sk_buff *skb;
4996         int err;
4997
4998         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4999                           extack);
5000         if (err < 0)
5001                 return err;
5002
5003         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5004         if (!addr)
5005                 return -EINVAL;
5006
5007         ifm = nlmsg_data(nlh);
5008         if (ifm->ifa_index)
5009                 dev = dev_get_by_index(net, ifm->ifa_index);
5010
5011         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
5012         if (!ifa) {
5013                 err = -EADDRNOTAVAIL;
5014                 goto errout;
5015         }
5016
5017         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5018         if (!skb) {
5019                 err = -ENOBUFS;
5020                 goto errout_ifa;
5021         }
5022
5023         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
5024                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
5025         if (err < 0) {
5026                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5027                 WARN_ON(err == -EMSGSIZE);
5028                 kfree_skb(skb);
5029                 goto errout_ifa;
5030         }
5031         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5032 errout_ifa:
5033         in6_ifa_put(ifa);
5034 errout:
5035         if (dev)
5036                 dev_put(dev);
5037         return err;
5038 }
5039
5040 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5041 {
5042         struct sk_buff *skb;
5043         struct net *net = dev_net(ifa->idev->dev);
5044         int err = -ENOBUFS;
5045
5046         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5047         if (!skb)
5048                 goto errout;
5049
5050         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
5051         if (err < 0) {
5052                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5053                 WARN_ON(err == -EMSGSIZE);
5054                 kfree_skb(skb);
5055                 goto errout;
5056         }
5057         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5058         return;
5059 errout:
5060         if (err < 0)
5061                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5062 }
5063
5064 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5065                                 __s32 *array, int bytes)
5066 {
5067         BUG_ON(bytes < (DEVCONF_MAX * 4));
5068
5069         memset(array, 0, bytes);
5070         array[DEVCONF_FORWARDING] = cnf->forwarding;
5071         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5072         array[DEVCONF_MTU6] = cnf->mtu6;
5073         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5074         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5075         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5076         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5077         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5078         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5079                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5080         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5081                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5082         array[DEVCONF_RTR_SOLICIT_DELAY] =
5083                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5084         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5085         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5086                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5087         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5088                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5089         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5090         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5091         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5092         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5093         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5094         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5095         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5096         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5097         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5098 #ifdef CONFIG_IPV6_ROUTER_PREF
5099         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5100         array[DEVCONF_RTR_PROBE_INTERVAL] =
5101                 jiffies_to_msecs(cnf->rtr_probe_interval);
5102 #ifdef CONFIG_IPV6_ROUTE_INFO
5103         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5104         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5105 #endif
5106 #endif
5107         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5108         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5109 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5110         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5111         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5112 #endif
5113 #ifdef CONFIG_IPV6_MROUTE
5114         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5115 #endif
5116         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5117         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5118         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5119         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5120         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5121         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5122         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5123         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5124         /* we omit DEVCONF_STABLE_SECRET for now */
5125         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5126         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5127         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5128         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5129         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5130 #ifdef CONFIG_IPV6_SEG6_HMAC
5131         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5132 #endif
5133         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5134         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5135         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5136         array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5137 }
5138
5139 static inline size_t inet6_ifla6_size(void)
5140 {
5141         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5142              + nla_total_size(sizeof(struct ifla_cacheinfo))
5143              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5144              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5145              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5146              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5147 }
5148
5149 static inline size_t inet6_if_nlmsg_size(void)
5150 {
5151         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5152                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5153                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5154                + nla_total_size(4) /* IFLA_MTU */
5155                + nla_total_size(4) /* IFLA_LINK */
5156                + nla_total_size(1) /* IFLA_OPERSTATE */
5157                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5158 }
5159
5160 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5161                                         int bytes)
5162 {
5163         int i;
5164         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5165         BUG_ON(pad < 0);
5166
5167         /* Use put_unaligned() because stats may not be aligned for u64. */
5168         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5169         for (i = 1; i < ICMP6_MIB_MAX; i++)
5170                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5171
5172         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5173 }
5174
5175 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5176                                         int bytes, size_t syncpoff)
5177 {
5178         int i, c;
5179         u64 buff[IPSTATS_MIB_MAX];
5180         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5181
5182         BUG_ON(pad < 0);
5183
5184         memset(buff, 0, sizeof(buff));
5185         buff[0] = IPSTATS_MIB_MAX;
5186
5187         for_each_possible_cpu(c) {
5188                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5189                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5190         }
5191
5192         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5193         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5194 }
5195
5196 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5197                              int bytes)
5198 {
5199         switch (attrtype) {
5200         case IFLA_INET6_STATS:
5201                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5202                                      offsetof(struct ipstats_mib, syncp));
5203                 break;
5204         case IFLA_INET6_ICMP6STATS:
5205                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5206                 break;
5207         }
5208 }
5209
5210 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5211                                   u32 ext_filter_mask)
5212 {
5213         struct nlattr *nla;
5214         struct ifla_cacheinfo ci;
5215
5216         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5217                 goto nla_put_failure;
5218         ci.max_reasm_len = IPV6_MAXPLEN;
5219         ci.tstamp = cstamp_delta(idev->tstamp);
5220         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5221         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5222         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5223                 goto nla_put_failure;
5224         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5225         if (!nla)
5226                 goto nla_put_failure;
5227         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5228
5229         /* XXX - MC not implemented */
5230
5231         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5232                 return 0;
5233
5234         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5235         if (!nla)
5236                 goto nla_put_failure;
5237         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5238
5239         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5240         if (!nla)
5241                 goto nla_put_failure;
5242         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5243
5244         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5245         if (!nla)
5246                 goto nla_put_failure;
5247
5248         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5249                 goto nla_put_failure;
5250
5251         read_lock_bh(&idev->lock);
5252         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5253         read_unlock_bh(&idev->lock);
5254
5255         return 0;
5256
5257 nla_put_failure:
5258         return -EMSGSIZE;
5259 }
5260
5261 static size_t inet6_get_link_af_size(const struct net_device *dev,
5262                                      u32 ext_filter_mask)
5263 {
5264         if (!__in6_dev_get(dev))
5265                 return 0;
5266
5267         return inet6_ifla6_size();
5268 }
5269
5270 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5271                               u32 ext_filter_mask)
5272 {
5273         struct inet6_dev *idev = __in6_dev_get(dev);
5274
5275         if (!idev)
5276                 return -ENODATA;
5277
5278         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5279                 return -EMSGSIZE;
5280
5281         return 0;
5282 }
5283
5284 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5285 {
5286         struct inet6_ifaddr *ifp;
5287         struct net_device *dev = idev->dev;
5288         bool clear_token, update_rs = false;
5289         struct in6_addr ll_addr;
5290
5291         ASSERT_RTNL();
5292
5293         if (!token)
5294                 return -EINVAL;
5295         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5296                 return -EINVAL;
5297         if (!ipv6_accept_ra(idev))
5298                 return -EINVAL;
5299         if (idev->cnf.rtr_solicits == 0)
5300                 return -EINVAL;
5301
5302         write_lock_bh(&idev->lock);
5303
5304         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5305         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5306
5307         write_unlock_bh(&idev->lock);
5308
5309         clear_token = ipv6_addr_any(token);
5310         if (clear_token)
5311                 goto update_lft;
5312
5313         if (!idev->dead && (idev->if_flags & IF_READY) &&
5314             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5315                              IFA_F_OPTIMISTIC)) {
5316                 /* If we're not ready, then normal ifup will take care
5317                  * of this. Otherwise, we need to request our rs here.
5318                  */
5319                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5320                 update_rs = true;
5321         }
5322
5323 update_lft:
5324         write_lock_bh(&idev->lock);
5325
5326         if (update_rs) {
5327                 idev->if_flags |= IF_RS_SENT;
5328                 idev->rs_interval = rfc3315_s14_backoff_init(
5329                         idev->cnf.rtr_solicit_interval);
5330                 idev->rs_probes = 1;
5331                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5332         }
5333
5334         /* Well, that's kinda nasty ... */
5335         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5336                 spin_lock(&ifp->lock);
5337                 if (ifp->tokenized) {
5338                         ifp->valid_lft = 0;
5339                         ifp->prefered_lft = 0;
5340                 }
5341                 spin_unlock(&ifp->lock);
5342         }
5343
5344         write_unlock_bh(&idev->lock);
5345         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5346         addrconf_verify_rtnl();
5347         return 0;
5348 }
5349
5350 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5351         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5352         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5353 };
5354
5355 static int inet6_validate_link_af(const struct net_device *dev,
5356                                   const struct nlattr *nla)
5357 {
5358         struct nlattr *tb[IFLA_INET6_MAX + 1];
5359
5360         if (dev && !__in6_dev_get(dev))
5361                 return -EAFNOSUPPORT;
5362
5363         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5364                                 NULL);
5365 }
5366
5367 static int check_addr_gen_mode(int mode)
5368 {
5369         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5370             mode != IN6_ADDR_GEN_MODE_NONE &&
5371             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5372             mode != IN6_ADDR_GEN_MODE_RANDOM)
5373                 return -EINVAL;
5374         return 1;
5375 }
5376
5377 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5378                                 int mode)
5379 {
5380         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5381             !idev->cnf.stable_secret.initialized &&
5382             !net->ipv6.devconf_dflt->stable_secret.initialized)
5383                 return -EINVAL;
5384         return 1;
5385 }
5386
5387 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5388 {
5389         int err = -EINVAL;
5390         struct inet6_dev *idev = __in6_dev_get(dev);
5391         struct nlattr *tb[IFLA_INET6_MAX + 1];
5392
5393         if (!idev)
5394                 return -EAFNOSUPPORT;
5395
5396         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5397                 BUG();
5398
5399         if (tb[IFLA_INET6_TOKEN]) {
5400                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5401                 if (err)
5402                         return err;
5403         }
5404
5405         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5406                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5407
5408                 if (check_addr_gen_mode(mode) < 0 ||
5409                     check_stable_privacy(idev, dev_net(dev), mode) < 0)
5410                         return -EINVAL;
5411
5412                 idev->cnf.addr_gen_mode = mode;
5413                 err = 0;
5414         }
5415
5416         return err;
5417 }
5418
5419 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5420                              u32 portid, u32 seq, int event, unsigned int flags)
5421 {
5422         struct net_device *dev = idev->dev;
5423         struct ifinfomsg *hdr;
5424         struct nlmsghdr *nlh;
5425         void *protoinfo;
5426
5427         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5428         if (!nlh)
5429                 return -EMSGSIZE;
5430
5431         hdr = nlmsg_data(nlh);
5432         hdr->ifi_family = AF_INET6;
5433         hdr->__ifi_pad = 0;
5434         hdr->ifi_type = dev->type;
5435         hdr->ifi_index = dev->ifindex;
5436         hdr->ifi_flags = dev_get_flags(dev);
5437         hdr->ifi_change = 0;
5438
5439         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5440             (dev->addr_len &&
5441              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5442             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5443             (dev->ifindex != dev_get_iflink(dev) &&
5444              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5445             nla_put_u8(skb, IFLA_OPERSTATE,
5446                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5447                 goto nla_put_failure;
5448         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5449         if (!protoinfo)
5450                 goto nla_put_failure;
5451
5452         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5453                 goto nla_put_failure;
5454
5455         nla_nest_end(skb, protoinfo);
5456         nlmsg_end(skb, nlh);
5457         return 0;
5458
5459 nla_put_failure:
5460         nlmsg_cancel(skb, nlh);
5461         return -EMSGSIZE;
5462 }
5463
5464 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5465 {
5466         struct net *net = sock_net(skb->sk);
5467         int h, s_h;
5468         int idx = 0, s_idx;
5469         struct net_device *dev;
5470         struct inet6_dev *idev;
5471         struct hlist_head *head;
5472
5473         s_h = cb->args[0];
5474         s_idx = cb->args[1];
5475
5476         rcu_read_lock();
5477         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5478                 idx = 0;
5479                 head = &net->dev_index_head[h];
5480                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5481                         if (idx < s_idx)
5482                                 goto cont;
5483                         idev = __in6_dev_get(dev);
5484                         if (!idev)
5485                                 goto cont;
5486                         if (inet6_fill_ifinfo(skb, idev,
5487                                               NETLINK_CB(cb->skb).portid,
5488                                               cb->nlh->nlmsg_seq,
5489                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5490                                 goto out;
5491 cont:
5492                         idx++;
5493                 }
5494         }
5495 out:
5496         rcu_read_unlock();
5497         cb->args[1] = idx;
5498         cb->args[0] = h;
5499
5500         return skb->len;
5501 }
5502
5503 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5504 {
5505         struct sk_buff *skb;
5506         struct net *net = dev_net(idev->dev);
5507         int err = -ENOBUFS;
5508
5509         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5510         if (!skb)
5511                 goto errout;
5512
5513         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5514         if (err < 0) {
5515                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5516                 WARN_ON(err == -EMSGSIZE);
5517                 kfree_skb(skb);
5518                 goto errout;
5519         }
5520         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5521         return;
5522 errout:
5523         if (err < 0)
5524                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5525 }
5526
5527 static inline size_t inet6_prefix_nlmsg_size(void)
5528 {
5529         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5530                + nla_total_size(sizeof(struct in6_addr))
5531                + nla_total_size(sizeof(struct prefix_cacheinfo));
5532 }
5533
5534 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5535                              struct prefix_info *pinfo, u32 portid, u32 seq,
5536                              int event, unsigned int flags)
5537 {
5538         struct prefixmsg *pmsg;
5539         struct nlmsghdr *nlh;
5540         struct prefix_cacheinfo ci;
5541
5542         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5543         if (!nlh)
5544                 return -EMSGSIZE;
5545
5546         pmsg = nlmsg_data(nlh);
5547         pmsg->prefix_family = AF_INET6;
5548         pmsg->prefix_pad1 = 0;
5549         pmsg->prefix_pad2 = 0;
5550         pmsg->prefix_ifindex = idev->dev->ifindex;
5551         pmsg->prefix_len = pinfo->prefix_len;
5552         pmsg->prefix_type = pinfo->type;
5553         pmsg->prefix_pad3 = 0;
5554         pmsg->prefix_flags = 0;
5555         if (pinfo->onlink)
5556                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5557         if (pinfo->autoconf)
5558                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5559
5560         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5561                 goto nla_put_failure;
5562         ci.preferred_time = ntohl(pinfo->prefered);
5563         ci.valid_time = ntohl(pinfo->valid);
5564         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5565                 goto nla_put_failure;
5566         nlmsg_end(skb, nlh);
5567         return 0;
5568
5569 nla_put_failure:
5570         nlmsg_cancel(skb, nlh);
5571         return -EMSGSIZE;
5572 }
5573
5574 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5575                          struct prefix_info *pinfo)
5576 {
5577         struct sk_buff *skb;
5578         struct net *net = dev_net(idev->dev);
5579         int err = -ENOBUFS;
5580
5581         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5582         if (!skb)
5583                 goto errout;
5584
5585         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5586         if (err < 0) {
5587                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5588                 WARN_ON(err == -EMSGSIZE);
5589                 kfree_skb(skb);
5590                 goto errout;
5591         }
5592         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5593         return;
5594 errout:
5595         if (err < 0)
5596                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5597 }
5598
5599 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5600 {
5601         struct net *net = dev_net(ifp->idev->dev);
5602
5603         if (event)
5604                 ASSERT_RTNL();
5605
5606         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5607
5608         switch (event) {
5609         case RTM_NEWADDR:
5610                 /*
5611                  * If the address was optimistic
5612                  * we inserted the route at the start of
5613                  * our DAD process, so we don't need
5614                  * to do it again
5615                  */
5616                 if (!rcu_access_pointer(ifp->rt->fib6_node))
5617                         ip6_ins_rt(net, ifp->rt);
5618                 if (ifp->idev->cnf.forwarding)
5619                         addrconf_join_anycast(ifp);
5620                 if (!ipv6_addr_any(&ifp->peer_addr))
5621                         addrconf_prefix_route(&ifp->peer_addr, 128,
5622                                               ifp->idev->dev, 0, 0,
5623                                               GFP_KERNEL);
5624                 break;
5625         case RTM_DELADDR:
5626                 if (ifp->idev->cnf.forwarding)
5627                         addrconf_leave_anycast(ifp);
5628                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5629                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5630                         struct fib6_info *rt;
5631
5632                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5633                                                        ifp->idev->dev, 0, 0);
5634                         if (rt)
5635                                 ip6_del_rt(net, rt);
5636                 }
5637                 if (ifp->rt) {
5638                         ip6_del_rt(net, ifp->rt);
5639                         ifp->rt = NULL;
5640                 }
5641                 rt_genid_bump_ipv6(net);
5642                 break;
5643         }
5644         atomic_inc(&net->ipv6.dev_addr_genid);
5645 }
5646
5647 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5648 {
5649         rcu_read_lock_bh();
5650         if (likely(ifp->idev->dead == 0))
5651                 __ipv6_ifa_notify(event, ifp);
5652         rcu_read_unlock_bh();
5653 }
5654
5655 #ifdef CONFIG_SYSCTL
5656
5657 static
5658 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5659                            void __user *buffer, size_t *lenp, loff_t *ppos)
5660 {
5661         int *valp = ctl->data;
5662         int val = *valp;
5663         loff_t pos = *ppos;
5664         struct ctl_table lctl;
5665         int ret;
5666
5667         /*
5668          * ctl->data points to idev->cnf.forwarding, we should
5669          * not modify it until we get the rtnl lock.
5670          */
5671         lctl = *ctl;
5672         lctl.data = &val;
5673
5674         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5675
5676         if (write)
5677                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5678         if (ret)
5679                 *ppos = pos;
5680         return ret;
5681 }
5682
5683 static
5684 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5685                         void __user *buffer, size_t *lenp, loff_t *ppos)
5686 {
5687         struct inet6_dev *idev = ctl->extra1;
5688         int min_mtu = IPV6_MIN_MTU;
5689         struct ctl_table lctl;
5690
5691         lctl = *ctl;
5692         lctl.extra1 = &min_mtu;
5693         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5694
5695         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5696 }
5697
5698 static void dev_disable_change(struct inet6_dev *idev)
5699 {
5700         struct netdev_notifier_info info;
5701
5702         if (!idev || !idev->dev)
5703                 return;
5704
5705         netdev_notifier_info_init(&info, idev->dev);
5706         if (idev->cnf.disable_ipv6)
5707                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5708         else
5709                 addrconf_notify(NULL, NETDEV_UP, &info);
5710 }
5711
5712 static void addrconf_disable_change(struct net *net, __s32 newf)
5713 {
5714         struct net_device *dev;
5715         struct inet6_dev *idev;
5716
5717         for_each_netdev(net, dev) {
5718                 idev = __in6_dev_get(dev);
5719                 if (idev) {
5720                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5721                         idev->cnf.disable_ipv6 = newf;
5722                         if (changed)
5723                                 dev_disable_change(idev);
5724                 }
5725         }
5726 }
5727
5728 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5729 {
5730         struct net *net;
5731         int old;
5732
5733         if (!rtnl_trylock())
5734                 return restart_syscall();
5735
5736         net = (struct net *)table->extra2;
5737         old = *p;
5738         *p = newf;
5739
5740         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5741                 rtnl_unlock();
5742                 return 0;
5743         }
5744
5745         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5746                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5747                 addrconf_disable_change(net, newf);
5748         } else if ((!newf) ^ (!old))
5749                 dev_disable_change((struct inet6_dev *)table->extra1);
5750
5751         rtnl_unlock();
5752         return 0;
5753 }
5754
5755 static
5756 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5757                             void __user *buffer, size_t *lenp, loff_t *ppos)
5758 {
5759         int *valp = ctl->data;
5760         int val = *valp;
5761         loff_t pos = *ppos;
5762         struct ctl_table lctl;
5763         int ret;
5764
5765         /*
5766          * ctl->data points to idev->cnf.disable_ipv6, we should
5767          * not modify it until we get the rtnl lock.
5768          */
5769         lctl = *ctl;
5770         lctl.data = &val;
5771
5772         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5773
5774         if (write)
5775                 ret = addrconf_disable_ipv6(ctl, valp, val);
5776         if (ret)
5777                 *ppos = pos;
5778         return ret;
5779 }
5780
5781 static
5782 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5783                               void __user *buffer, size_t *lenp, loff_t *ppos)
5784 {
5785         int *valp = ctl->data;
5786         int ret;
5787         int old, new;
5788
5789         old = *valp;
5790         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5791         new = *valp;
5792
5793         if (write && old != new) {
5794                 struct net *net = ctl->extra2;
5795
5796                 if (!rtnl_trylock())
5797                         return restart_syscall();
5798
5799                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5800                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5801                                                      NETCONFA_PROXY_NEIGH,
5802                                                      NETCONFA_IFINDEX_DEFAULT,
5803                                                      net->ipv6.devconf_dflt);
5804                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5805                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5806                                                      NETCONFA_PROXY_NEIGH,
5807                                                      NETCONFA_IFINDEX_ALL,
5808                                                      net->ipv6.devconf_all);
5809                 else {
5810                         struct inet6_dev *idev = ctl->extra1;
5811
5812                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5813                                                      NETCONFA_PROXY_NEIGH,
5814                                                      idev->dev->ifindex,
5815                                                      &idev->cnf);
5816                 }
5817                 rtnl_unlock();
5818         }
5819
5820         return ret;
5821 }
5822
5823 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5824                                          void __user *buffer, size_t *lenp,
5825                                          loff_t *ppos)
5826 {
5827         int ret = 0;
5828         int new_val;
5829         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5830         struct net *net = (struct net *)ctl->extra2;
5831
5832         if (!rtnl_trylock())
5833                 return restart_syscall();
5834
5835         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5836
5837         if (write) {
5838                 new_val = *((int *)ctl->data);
5839
5840                 if (check_addr_gen_mode(new_val) < 0) {
5841                         ret = -EINVAL;
5842                         goto out;
5843                 }
5844
5845                 /* request for default */
5846                 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5847                         ipv6_devconf_dflt.addr_gen_mode = new_val;
5848
5849                 /* request for individual net device */
5850                 } else {
5851                         if (!idev)
5852                                 goto out;
5853
5854                         if (check_stable_privacy(idev, net, new_val) < 0) {
5855                                 ret = -EINVAL;
5856                                 goto out;
5857                         }
5858
5859                         if (idev->cnf.addr_gen_mode != new_val) {
5860                                 idev->cnf.addr_gen_mode = new_val;
5861                                 addrconf_dev_config(idev->dev);
5862                         }
5863                 }
5864         }
5865
5866 out:
5867         rtnl_unlock();
5868
5869         return ret;
5870 }
5871
5872 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5873                                          void __user *buffer, size_t *lenp,
5874                                          loff_t *ppos)
5875 {
5876         int err;
5877         struct in6_addr addr;
5878         char str[IPV6_MAX_STRLEN];
5879         struct ctl_table lctl = *ctl;
5880         struct net *net = ctl->extra2;
5881         struct ipv6_stable_secret *secret = ctl->data;
5882
5883         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5884                 return -EIO;
5885
5886         lctl.maxlen = IPV6_MAX_STRLEN;
5887         lctl.data = str;
5888
5889         if (!rtnl_trylock())
5890                 return restart_syscall();
5891
5892         if (!write && !secret->initialized) {
5893                 err = -EIO;
5894                 goto out;
5895         }
5896
5897         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5898         if (err >= sizeof(str)) {
5899                 err = -EIO;
5900                 goto out;
5901         }
5902
5903         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5904         if (err || !write)
5905                 goto out;
5906
5907         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5908                 err = -EIO;
5909                 goto out;
5910         }
5911
5912         secret->initialized = true;
5913         secret->secret = addr;
5914
5915         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5916                 struct net_device *dev;
5917
5918                 for_each_netdev(net, dev) {
5919                         struct inet6_dev *idev = __in6_dev_get(dev);
5920
5921                         if (idev) {
5922                                 idev->cnf.addr_gen_mode =
5923                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5924                         }
5925                 }
5926         } else {
5927                 struct inet6_dev *idev = ctl->extra1;
5928
5929                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5930         }
5931
5932 out:
5933         rtnl_unlock();
5934
5935         return err;
5936 }
5937
5938 static
5939 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5940                                                 int write,
5941                                                 void __user *buffer,
5942                                                 size_t *lenp,
5943                                                 loff_t *ppos)
5944 {
5945         int *valp = ctl->data;
5946         int val = *valp;
5947         loff_t pos = *ppos;
5948         struct ctl_table lctl;
5949         int ret;
5950
5951         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5952          * we should not modify it until we get the rtnl lock.
5953          */
5954         lctl = *ctl;
5955         lctl.data = &val;
5956
5957         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5958
5959         if (write)
5960                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5961         if (ret)
5962                 *ppos = pos;
5963         return ret;
5964 }
5965
5966 static
5967 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5968 {
5969         if (rt) {
5970                 if (action)
5971                         rt->dst.flags |= DST_NOPOLICY;
5972                 else
5973                         rt->dst.flags &= ~DST_NOPOLICY;
5974         }
5975 }
5976
5977 static
5978 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5979 {
5980         struct inet6_ifaddr *ifa;
5981
5982         read_lock_bh(&idev->lock);
5983         list_for_each_entry(ifa, &idev->addr_list, if_list) {
5984                 spin_lock(&ifa->lock);
5985                 if (ifa->rt) {
5986                         struct fib6_info *rt = ifa->rt;
5987                         int cpu;
5988
5989                         rcu_read_lock();
5990                         ifa->rt->dst_nopolicy = val ? true : false;
5991                         if (rt->rt6i_pcpu) {
5992                                 for_each_possible_cpu(cpu) {
5993                                         struct rt6_info **rtp;
5994
5995                                         rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5996                                         addrconf_set_nopolicy(*rtp, val);
5997                                 }
5998                         }
5999                         rcu_read_unlock();
6000                 }
6001                 spin_unlock(&ifa->lock);
6002         }
6003         read_unlock_bh(&idev->lock);
6004 }
6005
6006 static
6007 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6008 {
6009         struct inet6_dev *idev;
6010         struct net *net;
6011
6012         if (!rtnl_trylock())
6013                 return restart_syscall();
6014
6015         *valp = val;
6016
6017         net = (struct net *)ctl->extra2;
6018         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6019                 rtnl_unlock();
6020                 return 0;
6021         }
6022
6023         if (valp == &net->ipv6.devconf_all->disable_policy)  {
6024                 struct net_device *dev;
6025
6026                 for_each_netdev(net, dev) {
6027                         idev = __in6_dev_get(dev);
6028                         if (idev)
6029                                 addrconf_disable_policy_idev(idev, val);
6030                 }
6031         } else {
6032                 idev = (struct inet6_dev *)ctl->extra1;
6033                 addrconf_disable_policy_idev(idev, val);
6034         }
6035
6036         rtnl_unlock();
6037         return 0;
6038 }
6039
6040 static
6041 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6042                                    void __user *buffer, size_t *lenp,
6043                                    loff_t *ppos)
6044 {
6045         int *valp = ctl->data;
6046         int val = *valp;
6047         loff_t pos = *ppos;
6048         struct ctl_table lctl;
6049         int ret;
6050
6051         lctl = *ctl;
6052         lctl.data = &val;
6053         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6054
6055         if (write && (*valp != val))
6056                 ret = addrconf_disable_policy(ctl, valp, val);
6057
6058         if (ret)
6059                 *ppos = pos;
6060
6061         return ret;
6062 }
6063
6064 static int minus_one = -1;
6065 static const int zero = 0;
6066 static const int one = 1;
6067 static const int two_five_five = 255;
6068
6069 static const struct ctl_table addrconf_sysctl[] = {
6070         {
6071                 .procname       = "forwarding",
6072                 .data           = &ipv6_devconf.forwarding,
6073                 .maxlen         = sizeof(int),
6074                 .mode           = 0644,
6075                 .proc_handler   = addrconf_sysctl_forward,
6076         },
6077         {
6078                 .procname       = "hop_limit",
6079                 .data           = &ipv6_devconf.hop_limit,
6080                 .maxlen         = sizeof(int),
6081                 .mode           = 0644,
6082                 .proc_handler   = proc_dointvec_minmax,
6083                 .extra1         = (void *)&one,
6084                 .extra2         = (void *)&two_five_five,
6085         },
6086         {
6087                 .procname       = "mtu",
6088                 .data           = &ipv6_devconf.mtu6,
6089                 .maxlen         = sizeof(int),
6090                 .mode           = 0644,
6091                 .proc_handler   = addrconf_sysctl_mtu,
6092         },
6093         {
6094                 .procname       = "accept_ra",
6095                 .data           = &ipv6_devconf.accept_ra,
6096                 .maxlen         = sizeof(int),
6097                 .mode           = 0644,
6098                 .proc_handler   = proc_dointvec,
6099         },
6100         {
6101                 .procname       = "accept_redirects",
6102                 .data           = &ipv6_devconf.accept_redirects,
6103                 .maxlen         = sizeof(int),
6104                 .mode           = 0644,
6105                 .proc_handler   = proc_dointvec,
6106         },
6107         {
6108                 .procname       = "autoconf",
6109                 .data           = &ipv6_devconf.autoconf,
6110                 .maxlen         = sizeof(int),
6111                 .mode           = 0644,
6112                 .proc_handler   = proc_dointvec,
6113         },
6114         {
6115                 .procname       = "dad_transmits",
6116                 .data           = &ipv6_devconf.dad_transmits,
6117                 .maxlen         = sizeof(int),
6118                 .mode           = 0644,
6119                 .proc_handler   = proc_dointvec,
6120         },
6121         {
6122                 .procname       = "router_solicitations",
6123                 .data           = &ipv6_devconf.rtr_solicits,
6124                 .maxlen         = sizeof(int),
6125                 .mode           = 0644,
6126                 .proc_handler   = proc_dointvec_minmax,
6127                 .extra1         = &minus_one,
6128         },
6129         {
6130                 .procname       = "router_solicitation_interval",
6131                 .data           = &ipv6_devconf.rtr_solicit_interval,
6132                 .maxlen         = sizeof(int),
6133                 .mode           = 0644,
6134                 .proc_handler   = proc_dointvec_jiffies,
6135         },
6136         {
6137                 .procname       = "router_solicitation_max_interval",
6138                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6139                 .maxlen         = sizeof(int),
6140                 .mode           = 0644,
6141                 .proc_handler   = proc_dointvec_jiffies,
6142         },
6143         {
6144                 .procname       = "router_solicitation_delay",
6145                 .data           = &ipv6_devconf.rtr_solicit_delay,
6146                 .maxlen         = sizeof(int),
6147                 .mode           = 0644,
6148                 .proc_handler   = proc_dointvec_jiffies,
6149         },
6150         {
6151                 .procname       = "force_mld_version",
6152                 .data           = &ipv6_devconf.force_mld_version,
6153                 .maxlen         = sizeof(int),
6154                 .mode           = 0644,
6155                 .proc_handler   = proc_dointvec,
6156         },
6157         {
6158                 .procname       = "mldv1_unsolicited_report_interval",
6159                 .data           =
6160                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6161                 .maxlen         = sizeof(int),
6162                 .mode           = 0644,
6163                 .proc_handler   = proc_dointvec_ms_jiffies,
6164         },
6165         {
6166                 .procname       = "mldv2_unsolicited_report_interval",
6167                 .data           =
6168                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6169                 .maxlen         = sizeof(int),
6170                 .mode           = 0644,
6171                 .proc_handler   = proc_dointvec_ms_jiffies,
6172         },
6173         {
6174                 .procname       = "use_tempaddr",
6175                 .data           = &ipv6_devconf.use_tempaddr,
6176                 .maxlen         = sizeof(int),
6177                 .mode           = 0644,
6178                 .proc_handler   = proc_dointvec,
6179         },
6180         {
6181                 .procname       = "temp_valid_lft",
6182                 .data           = &ipv6_devconf.temp_valid_lft,
6183                 .maxlen         = sizeof(int),
6184                 .mode           = 0644,
6185                 .proc_handler   = proc_dointvec,
6186         },
6187         {
6188                 .procname       = "temp_prefered_lft",
6189                 .data           = &ipv6_devconf.temp_prefered_lft,
6190                 .maxlen         = sizeof(int),
6191                 .mode           = 0644,
6192                 .proc_handler   = proc_dointvec,
6193         },
6194         {
6195                 .procname       = "regen_max_retry",
6196                 .data           = &ipv6_devconf.regen_max_retry,
6197                 .maxlen         = sizeof(int),
6198                 .mode           = 0644,
6199                 .proc_handler   = proc_dointvec,
6200         },
6201         {
6202                 .procname       = "max_desync_factor",
6203                 .data           = &ipv6_devconf.max_desync_factor,
6204                 .maxlen         = sizeof(int),
6205                 .mode           = 0644,
6206                 .proc_handler   = proc_dointvec,
6207         },
6208         {
6209                 .procname       = "max_addresses",
6210                 .data           = &ipv6_devconf.max_addresses,
6211                 .maxlen         = sizeof(int),
6212                 .mode           = 0644,
6213                 .proc_handler   = proc_dointvec,
6214         },
6215         {
6216                 .procname       = "accept_ra_defrtr",
6217                 .data           = &ipv6_devconf.accept_ra_defrtr,
6218                 .maxlen         = sizeof(int),
6219                 .mode           = 0644,
6220                 .proc_handler   = proc_dointvec,
6221         },
6222         {
6223                 .procname       = "accept_ra_min_hop_limit",
6224                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6225                 .maxlen         = sizeof(int),
6226                 .mode           = 0644,
6227                 .proc_handler   = proc_dointvec,
6228         },
6229         {
6230                 .procname       = "accept_ra_pinfo",
6231                 .data           = &ipv6_devconf.accept_ra_pinfo,
6232                 .maxlen         = sizeof(int),
6233                 .mode           = 0644,
6234                 .proc_handler   = proc_dointvec,
6235         },
6236 #ifdef CONFIG_IPV6_ROUTER_PREF
6237         {
6238                 .procname       = "accept_ra_rtr_pref",
6239                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6240                 .maxlen         = sizeof(int),
6241                 .mode           = 0644,
6242                 .proc_handler   = proc_dointvec,
6243         },
6244         {
6245                 .procname       = "router_probe_interval",
6246                 .data           = &ipv6_devconf.rtr_probe_interval,
6247                 .maxlen         = sizeof(int),
6248                 .mode           = 0644,
6249                 .proc_handler   = proc_dointvec_jiffies,
6250         },
6251 #ifdef CONFIG_IPV6_ROUTE_INFO
6252         {
6253                 .procname       = "accept_ra_rt_info_min_plen",
6254                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6255                 .maxlen         = sizeof(int),
6256                 .mode           = 0644,
6257                 .proc_handler   = proc_dointvec,
6258         },
6259         {
6260                 .procname       = "accept_ra_rt_info_max_plen",
6261                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6262                 .maxlen         = sizeof(int),
6263                 .mode           = 0644,
6264                 .proc_handler   = proc_dointvec,
6265         },
6266 #endif
6267 #endif
6268         {
6269                 .procname       = "proxy_ndp",
6270                 .data           = &ipv6_devconf.proxy_ndp,
6271                 .maxlen         = sizeof(int),
6272                 .mode           = 0644,
6273                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6274         },
6275         {
6276                 .procname       = "accept_source_route",
6277                 .data           = &ipv6_devconf.accept_source_route,
6278                 .maxlen         = sizeof(int),
6279                 .mode           = 0644,
6280                 .proc_handler   = proc_dointvec,
6281         },
6282 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6283         {
6284                 .procname       = "optimistic_dad",
6285                 .data           = &ipv6_devconf.optimistic_dad,
6286                 .maxlen         = sizeof(int),
6287                 .mode           = 0644,
6288                 .proc_handler   = proc_dointvec,
6289         },
6290         {
6291                 .procname       = "use_optimistic",
6292                 .data           = &ipv6_devconf.use_optimistic,
6293                 .maxlen         = sizeof(int),
6294                 .mode           = 0644,
6295                 .proc_handler   = proc_dointvec,
6296         },
6297 #endif
6298 #ifdef CONFIG_IPV6_MROUTE
6299         {
6300                 .procname       = "mc_forwarding",
6301                 .data           = &ipv6_devconf.mc_forwarding,
6302                 .maxlen         = sizeof(int),
6303                 .mode           = 0444,
6304                 .proc_handler   = proc_dointvec,
6305         },
6306 #endif
6307         {
6308                 .procname       = "disable_ipv6",
6309                 .data           = &ipv6_devconf.disable_ipv6,
6310                 .maxlen         = sizeof(int),
6311                 .mode           = 0644,
6312                 .proc_handler   = addrconf_sysctl_disable,
6313         },
6314         {
6315                 .procname       = "accept_dad",
6316                 .data           = &ipv6_devconf.accept_dad,
6317                 .maxlen         = sizeof(int),
6318                 .mode           = 0644,
6319                 .proc_handler   = proc_dointvec,
6320         },
6321         {
6322                 .procname       = "force_tllao",
6323                 .data           = &ipv6_devconf.force_tllao,
6324                 .maxlen         = sizeof(int),
6325                 .mode           = 0644,
6326                 .proc_handler   = proc_dointvec
6327         },
6328         {
6329                 .procname       = "ndisc_notify",
6330                 .data           = &ipv6_devconf.ndisc_notify,
6331                 .maxlen         = sizeof(int),
6332                 .mode           = 0644,
6333                 .proc_handler   = proc_dointvec
6334         },
6335         {
6336                 .procname       = "suppress_frag_ndisc",
6337                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6338                 .maxlen         = sizeof(int),
6339                 .mode           = 0644,
6340                 .proc_handler   = proc_dointvec
6341         },
6342         {
6343                 .procname       = "accept_ra_from_local",
6344                 .data           = &ipv6_devconf.accept_ra_from_local,
6345                 .maxlen         = sizeof(int),
6346                 .mode           = 0644,
6347                 .proc_handler   = proc_dointvec,
6348         },
6349         {
6350                 .procname       = "accept_ra_mtu",
6351                 .data           = &ipv6_devconf.accept_ra_mtu,
6352                 .maxlen         = sizeof(int),
6353                 .mode           = 0644,
6354                 .proc_handler   = proc_dointvec,
6355         },
6356         {
6357                 .procname       = "stable_secret",
6358                 .data           = &ipv6_devconf.stable_secret,
6359                 .maxlen         = IPV6_MAX_STRLEN,
6360                 .mode           = 0600,
6361                 .proc_handler   = addrconf_sysctl_stable_secret,
6362         },
6363         {
6364                 .procname       = "use_oif_addrs_only",
6365                 .data           = &ipv6_devconf.use_oif_addrs_only,
6366                 .maxlen         = sizeof(int),
6367                 .mode           = 0644,
6368                 .proc_handler   = proc_dointvec,
6369         },
6370         {
6371                 .procname       = "ignore_routes_with_linkdown",
6372                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6373                 .maxlen         = sizeof(int),
6374                 .mode           = 0644,
6375                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6376         },
6377         {
6378                 .procname       = "drop_unicast_in_l2_multicast",
6379                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6380                 .maxlen         = sizeof(int),
6381                 .mode           = 0644,
6382                 .proc_handler   = proc_dointvec,
6383         },
6384         {
6385                 .procname       = "drop_unsolicited_na",
6386                 .data           = &ipv6_devconf.drop_unsolicited_na,
6387                 .maxlen         = sizeof(int),
6388                 .mode           = 0644,
6389                 .proc_handler   = proc_dointvec,
6390         },
6391         {
6392                 .procname       = "keep_addr_on_down",
6393                 .data           = &ipv6_devconf.keep_addr_on_down,
6394                 .maxlen         = sizeof(int),
6395                 .mode           = 0644,
6396                 .proc_handler   = proc_dointvec,
6397
6398         },
6399         {
6400                 .procname       = "seg6_enabled",
6401                 .data           = &ipv6_devconf.seg6_enabled,
6402                 .maxlen         = sizeof(int),
6403                 .mode           = 0644,
6404                 .proc_handler   = proc_dointvec,
6405         },
6406 #ifdef CONFIG_IPV6_SEG6_HMAC
6407         {
6408                 .procname       = "seg6_require_hmac",
6409                 .data           = &ipv6_devconf.seg6_require_hmac,
6410                 .maxlen         = sizeof(int),
6411                 .mode           = 0644,
6412                 .proc_handler   = proc_dointvec,
6413         },
6414 #endif
6415         {
6416                 .procname       = "enhanced_dad",
6417                 .data           = &ipv6_devconf.enhanced_dad,
6418                 .maxlen         = sizeof(int),
6419                 .mode           = 0644,
6420                 .proc_handler   = proc_dointvec,
6421         },
6422         {
6423                 .procname               = "addr_gen_mode",
6424                 .data                   = &ipv6_devconf.addr_gen_mode,
6425                 .maxlen                 = sizeof(int),
6426                 .mode                   = 0644,
6427                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6428         },
6429         {
6430                 .procname       = "disable_policy",
6431                 .data           = &ipv6_devconf.disable_policy,
6432                 .maxlen         = sizeof(int),
6433                 .mode           = 0644,
6434                 .proc_handler   = addrconf_sysctl_disable_policy,
6435         },
6436         {
6437                 .procname       = "ndisc_tclass",
6438                 .data           = &ipv6_devconf.ndisc_tclass,
6439                 .maxlen         = sizeof(int),
6440                 .mode           = 0644,
6441                 .proc_handler   = proc_dointvec_minmax,
6442                 .extra1         = (void *)&zero,
6443                 .extra2         = (void *)&two_five_five,
6444         },
6445         {
6446                 /* sentinel */
6447         }
6448 };
6449
6450 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6451                 struct inet6_dev *idev, struct ipv6_devconf *p)
6452 {
6453         int i, ifindex;
6454         struct ctl_table *table;
6455         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6456
6457         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6458         if (!table)
6459                 goto out;
6460
6461         for (i = 0; table[i].data; i++) {
6462                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6463                 /* If one of these is already set, then it is not safe to
6464                  * overwrite either of them: this makes proc_dointvec_minmax
6465                  * usable.
6466                  */
6467                 if (!table[i].extra1 && !table[i].extra2) {
6468                         table[i].extra1 = idev; /* embedded; no ref */
6469                         table[i].extra2 = net;
6470                 }
6471         }
6472
6473         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6474
6475         p->sysctl_header = register_net_sysctl(net, path, table);
6476         if (!p->sysctl_header)
6477                 goto free;
6478
6479         if (!strcmp(dev_name, "all"))
6480                 ifindex = NETCONFA_IFINDEX_ALL;
6481         else if (!strcmp(dev_name, "default"))
6482                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6483         else
6484                 ifindex = idev->dev->ifindex;
6485         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6486                                      ifindex, p);
6487         return 0;
6488
6489 free:
6490         kfree(table);
6491 out:
6492         return -ENOBUFS;
6493 }
6494
6495 static void __addrconf_sysctl_unregister(struct net *net,
6496                                          struct ipv6_devconf *p, int ifindex)
6497 {
6498         struct ctl_table *table;
6499
6500         if (!p->sysctl_header)
6501                 return;
6502
6503         table = p->sysctl_header->ctl_table_arg;
6504         unregister_net_sysctl_table(p->sysctl_header);
6505         p->sysctl_header = NULL;
6506         kfree(table);
6507
6508         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6509 }
6510
6511 static int addrconf_sysctl_register(struct inet6_dev *idev)
6512 {
6513         int err;
6514
6515         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6516                 return -EINVAL;
6517
6518         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6519                                     &ndisc_ifinfo_sysctl_change);
6520         if (err)
6521                 return err;
6522         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6523                                          idev, &idev->cnf);
6524         if (err)
6525                 neigh_sysctl_unregister(idev->nd_parms);
6526
6527         return err;
6528 }
6529
6530 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6531 {
6532         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6533                                      idev->dev->ifindex);
6534         neigh_sysctl_unregister(idev->nd_parms);
6535 }
6536
6537
6538 #endif
6539
6540 static int __net_init addrconf_init_net(struct net *net)
6541 {
6542         int err = -ENOMEM;
6543         struct ipv6_devconf *all, *dflt;
6544
6545         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6546         if (!all)
6547                 goto err_alloc_all;
6548
6549         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6550         if (!dflt)
6551                 goto err_alloc_dflt;
6552
6553         /* these will be inherited by all namespaces */
6554         dflt->autoconf = ipv6_defaults.autoconf;
6555         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6556
6557         dflt->stable_secret.initialized = false;
6558         all->stable_secret.initialized = false;
6559
6560         net->ipv6.devconf_all = all;
6561         net->ipv6.devconf_dflt = dflt;
6562
6563 #ifdef CONFIG_SYSCTL
6564         err = __addrconf_sysctl_register(net, "all", NULL, all);
6565         if (err < 0)
6566                 goto err_reg_all;
6567
6568         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6569         if (err < 0)
6570                 goto err_reg_dflt;
6571 #endif
6572         return 0;
6573
6574 #ifdef CONFIG_SYSCTL
6575 err_reg_dflt:
6576         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6577 err_reg_all:
6578         kfree(dflt);
6579 #endif
6580 err_alloc_dflt:
6581         kfree(all);
6582 err_alloc_all:
6583         return err;
6584 }
6585
6586 static void __net_exit addrconf_exit_net(struct net *net)
6587 {
6588 #ifdef CONFIG_SYSCTL
6589         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6590                                      NETCONFA_IFINDEX_DEFAULT);
6591         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6592                                      NETCONFA_IFINDEX_ALL);
6593 #endif
6594         kfree(net->ipv6.devconf_dflt);
6595         kfree(net->ipv6.devconf_all);
6596 }
6597
6598 static struct pernet_operations addrconf_ops = {
6599         .init = addrconf_init_net,
6600         .exit = addrconf_exit_net,
6601 };
6602
6603 static struct rtnl_af_ops inet6_ops __read_mostly = {
6604         .family           = AF_INET6,
6605         .fill_link_af     = inet6_fill_link_af,
6606         .get_link_af_size = inet6_get_link_af_size,
6607         .validate_link_af = inet6_validate_link_af,
6608         .set_link_af      = inet6_set_link_af,
6609 };
6610
6611 /*
6612  *      Init / cleanup code
6613  */
6614
6615 int __init addrconf_init(void)
6616 {
6617         struct inet6_dev *idev;
6618         int i, err;
6619
6620         err = ipv6_addr_label_init();
6621         if (err < 0) {
6622                 pr_crit("%s: cannot initialize default policy table: %d\n",
6623                         __func__, err);
6624                 goto out;
6625         }
6626
6627         err = register_pernet_subsys(&addrconf_ops);
6628         if (err < 0)
6629                 goto out_addrlabel;
6630
6631         addrconf_wq = create_workqueue("ipv6_addrconf");
6632         if (!addrconf_wq) {
6633                 err = -ENOMEM;
6634                 goto out_nowq;
6635         }
6636
6637         /* The addrconf netdev notifier requires that loopback_dev
6638          * has it's ipv6 private information allocated and setup
6639          * before it can bring up and give link-local addresses
6640          * to other devices which are up.
6641          *
6642          * Unfortunately, loopback_dev is not necessarily the first
6643          * entry in the global dev_base list of net devices.  In fact,
6644          * it is likely to be the very last entry on that list.
6645          * So this causes the notifier registry below to try and
6646          * give link-local addresses to all devices besides loopback_dev
6647          * first, then loopback_dev, which cases all the non-loopback_dev
6648          * devices to fail to get a link-local address.
6649          *
6650          * So, as a temporary fix, allocate the ipv6 structure for
6651          * loopback_dev first by hand.
6652          * Longer term, all of the dependencies ipv6 has upon the loopback
6653          * device and it being up should be removed.
6654          */
6655         rtnl_lock();
6656         idev = ipv6_add_dev(init_net.loopback_dev);
6657         rtnl_unlock();
6658         if (IS_ERR(idev)) {
6659                 err = PTR_ERR(idev);
6660                 goto errlo;
6661         }
6662
6663         ip6_route_init_special_entries();
6664
6665         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6666                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6667
6668         register_netdevice_notifier(&ipv6_dev_notf);
6669
6670         addrconf_verify();
6671
6672         rtnl_af_register(&inet6_ops);
6673
6674         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6675                                    NULL, inet6_dump_ifinfo, 0);
6676         if (err < 0)
6677                 goto errout;
6678
6679         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6680                                    inet6_rtm_newaddr, NULL, 0);
6681         if (err < 0)
6682                 goto errout;
6683         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6684                                    inet6_rtm_deladdr, NULL, 0);
6685         if (err < 0)
6686                 goto errout;
6687         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6688                                    inet6_rtm_getaddr, inet6_dump_ifaddr,
6689                                    RTNL_FLAG_DOIT_UNLOCKED);
6690         if (err < 0)
6691                 goto errout;
6692         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6693                                    NULL, inet6_dump_ifmcaddr, 0);
6694         if (err < 0)
6695                 goto errout;
6696         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6697                                    NULL, inet6_dump_ifacaddr, 0);
6698         if (err < 0)
6699                 goto errout;
6700         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6701                                    inet6_netconf_get_devconf,
6702                                    inet6_netconf_dump_devconf,
6703                                    RTNL_FLAG_DOIT_UNLOCKED);
6704         if (err < 0)
6705                 goto errout;
6706         err = ipv6_addr_label_rtnl_register();
6707         if (err < 0)
6708                 goto errout;
6709
6710         return 0;
6711 errout:
6712         rtnl_unregister_all(PF_INET6);
6713         rtnl_af_unregister(&inet6_ops);
6714         unregister_netdevice_notifier(&ipv6_dev_notf);
6715 errlo:
6716         destroy_workqueue(addrconf_wq);
6717 out_nowq:
6718         unregister_pernet_subsys(&addrconf_ops);
6719 out_addrlabel:
6720         ipv6_addr_label_cleanup();
6721 out:
6722         return err;
6723 }
6724
6725 void addrconf_cleanup(void)
6726 {
6727         struct net_device *dev;
6728         int i;
6729
6730         unregister_netdevice_notifier(&ipv6_dev_notf);
6731         unregister_pernet_subsys(&addrconf_ops);
6732         ipv6_addr_label_cleanup();
6733
6734         rtnl_af_unregister(&inet6_ops);
6735
6736         rtnl_lock();
6737
6738         /* clean dev list */
6739         for_each_netdev(&init_net, dev) {
6740                 if (__in6_dev_get(dev) == NULL)
6741                         continue;
6742                 addrconf_ifdown(dev, 1);
6743         }
6744         addrconf_ifdown(init_net.loopback_dev, 2);
6745
6746         /*
6747          *      Check hash table.
6748          */
6749         spin_lock_bh(&addrconf_hash_lock);
6750         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6751                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6752         spin_unlock_bh(&addrconf_hash_lock);
6753         cancel_delayed_work(&addr_chk_work);
6754         rtnl_unlock();
6755
6756         destroy_workqueue(addrconf_wq);
6757 }