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 /* Set to 3 to get tracing... */
  98 #define ACONF_DEBUG 2
  99
 100 #if ACONF_DEBUG >= 3
 101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
 102 #else
 103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 104 #endif
 105
 106 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 107
 108 #define IPV6_MAX_STRLEN \
 109         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
 110
 111 static inline u32 cstamp_delta(unsigned long cstamp)
 112 {
 113         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 114 }
 115
 116 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 117 {
 118         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 119         u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
 120         do_div(tmp, 1000000);
 121         return (s32)tmp;
 122 }
 123
 124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 125 {
 126         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 127         u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
 128         do_div(tmp, 1000000);
 129         if ((s32)tmp > mrt) {
 130                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 131                 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
 132                 do_div(tmp, 1000000);
 133         }
 134         return (s32)tmp;
 135 }
 136
 137 #ifdef CONFIG_SYSCTL
 138 static int addrconf_sysctl_register(struct inet6_dev *idev);
 139 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 140 #else
 141 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 142 {
 143         return 0;
 144 }
 145
 146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 147 {
 148 }
 149 #endif
 150
 151 static void ipv6_regen_rndid(struct inet6_dev *idev);
 152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 153
 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 155 static int ipv6_count_addresses(struct inet6_dev *idev);
 156 static int ipv6_generate_stable_address(struct in6_addr *addr,
 157                                         u8 dad_count,
 158                                         const struct inet6_dev *idev);
 159
 160 /*
 161  *      Configured unicast address hash table
 162  */
 163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 164 static DEFINE_SPINLOCK(addrconf_hash_lock);
 165
 166 static void addrconf_verify(void);
 167 static void addrconf_verify_rtnl(void);
 168 static void addrconf_verify_work(struct work_struct *);
 169
 170 static struct workqueue_struct *addrconf_wq;
 171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 172
 173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 175
 176 static void addrconf_type_change(struct net_device *dev,
 177                                  unsigned long event);
 178 static int addrconf_ifdown(struct net_device *dev, int how);
 179
 180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 181                                                   int plen,
 182                                                   const struct net_device *dev,
 183                                                   u32 flags, u32 noflags);
 184
 185 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 186 static void addrconf_dad_work(struct work_struct *w);
 187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
 188 static void addrconf_dad_run(struct inet6_dev *idev);
 189 static void addrconf_rs_timer(unsigned long data);
 190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 192
 193 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 194                                 struct prefix_info *pinfo);
 195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 196                                struct net_device *dev);
 197
 198 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 199         .forwarding             = 0,
 200         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 201         .mtu6                   = IPV6_MIN_MTU,
 202         .accept_ra              = 1,
 203         .accept_redirects       = 1,
 204         .autoconf               = 1,
 205         .force_mld_version      = 0,
 206         .mldv1_unsolicited_report_interval = 10 * HZ,
 207         .mldv2_unsolicited_report_interval = HZ,
 208         .dad_transmits          = 1,
 209         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 210         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 211         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 212         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 213         .use_tempaddr           = 0,
 214         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 215         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 216         .regen_max_retry        = REGEN_MAX_RETRY,
 217         .max_desync_factor      = MAX_DESYNC_FACTOR,
 218         .max_addresses          = IPV6_MAX_ADDRESSES,
 219         .accept_ra_defrtr       = 1,
 220         .accept_ra_from_local   = 0,
 221         .accept_ra_min_hop_limit= 1,
 222         .accept_ra_pinfo        = 1,
 223 #ifdef CONFIG_IPV6_ROUTER_PREF
 224         .accept_ra_rtr_pref     = 1,
 225         .rtr_probe_interval     = 60 * HZ,
 226 #ifdef CONFIG_IPV6_ROUTE_INFO
 227         .accept_ra_rt_info_min_plen = 0,
 228         .accept_ra_rt_info_max_plen = 0,
 229 #endif
 230 #endif
 231         .proxy_ndp              = 0,
 232         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 233         .disable_ipv6           = 0,
 234         .accept_dad             = 1,
 235         .suppress_frag_ndisc    = 1,
 236         .accept_ra_mtu          = 1,
 237         .stable_secret          = {
 238                 .initialized = false,
 239         },
 240         .use_oif_addrs_only     = 0,
 241         .ignore_routes_with_linkdown = 0,
 242         .keep_addr_on_down      = 0,
 243         .seg6_enabled           = 0,
 244 #ifdef CONFIG_IPV6_SEG6_HMAC
 245         .seg6_require_hmac      = 0,
 246 #endif
 247         .enhanced_dad           = 1,
 248         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 249         .disable_policy         = 0,
 250 };
 251
 252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 253         .forwarding             = 0,
 254         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 255         .mtu6                   = IPV6_MIN_MTU,
 256         .accept_ra              = 1,
 257         .accept_redirects       = 1,
 258         .autoconf               = 1,
 259         .force_mld_version      = 0,
 260         .mldv1_unsolicited_report_interval = 10 * HZ,
 261         .mldv2_unsolicited_report_interval = HZ,
 262         .dad_transmits          = 1,
 263         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 264         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 265         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 266         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 267         .use_tempaddr           = 0,
 268         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 269         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 270         .regen_max_retry        = REGEN_MAX_RETRY,
 271         .max_desync_factor      = MAX_DESYNC_FACTOR,
 272         .max_addresses          = IPV6_MAX_ADDRESSES,
 273         .accept_ra_defrtr       = 1,
 274         .accept_ra_from_local   = 0,
 275         .accept_ra_min_hop_limit= 1,
 276         .accept_ra_pinfo        = 1,
 277 #ifdef CONFIG_IPV6_ROUTER_PREF
 278         .accept_ra_rtr_pref     = 1,
 279         .rtr_probe_interval     = 60 * HZ,
 280 #ifdef CONFIG_IPV6_ROUTE_INFO
 281         .accept_ra_rt_info_min_plen = 0,
 282         .accept_ra_rt_info_max_plen = 0,
 283 #endif
 284 #endif
 285         .proxy_ndp              = 0,
 286         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 287         .disable_ipv6           = 0,
 288         .accept_dad             = 1,
 289         .suppress_frag_ndisc    = 1,
 290         .accept_ra_mtu          = 1,
 291         .stable_secret          = {
 292                 .initialized = false,
 293         },
 294         .use_oif_addrs_only     = 0,
 295         .ignore_routes_with_linkdown = 0,
 296         .keep_addr_on_down      = 0,
 297         .seg6_enabled           = 0,
 298 #ifdef CONFIG_IPV6_SEG6_HMAC
 299         .seg6_require_hmac      = 0,
 300 #endif
 301         .enhanced_dad           = 1,
 302         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 303         .disable_policy         = 0,
 304 };
 305
 306 /* Check if a valid qdisc is available */
 307 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 308 {
 309         return !qdisc_tx_is_noop(dev);
 310 }
 311
 312 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 313 {
 314         if (del_timer(&idev->rs_timer))
 315                 __in6_dev_put(idev);
 316 }
 317
 318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 319 {
 320         if (cancel_delayed_work(&ifp->dad_work))
 321                 __in6_ifa_put(ifp);
 322 }
 323
 324 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 325                                   unsigned long when)
 326 {
 327         if (!timer_pending(&idev->rs_timer))
 328                 in6_dev_hold(idev);
 329         mod_timer(&idev->rs_timer, jiffies + when);
 330 }
 331
 332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 333                                    unsigned long delay)
 334 {
 335         if (!delayed_work_pending(&ifp->dad_work))
 336                 in6_ifa_hold(ifp);
 337         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 338 }
 339
 340 static int snmp6_alloc_dev(struct inet6_dev *idev)
 341 {
 342         int i;
 343
 344         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 345         if (!idev->stats.ipv6)
 346                 goto err_ip;
 347
 348         for_each_possible_cpu(i) {
 349                 struct ipstats_mib *addrconf_stats;
 350                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 351                 u64_stats_init(&addrconf_stats->syncp);
 352         }
 353
 354
 355         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 356                                         GFP_KERNEL);
 357         if (!idev->stats.icmpv6dev)
 358                 goto err_icmp;
 359         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 360                                            GFP_KERNEL);
 361         if (!idev->stats.icmpv6msgdev)
 362                 goto err_icmpmsg;
 363
 364         return 0;
 365
 366 err_icmpmsg:
 367         kfree(idev->stats.icmpv6dev);
 368 err_icmp:
 369         free_percpu(idev->stats.ipv6);
 370 err_ip:
 371         return -ENOMEM;
 372 }
 373
 374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 375 {
 376         struct inet6_dev *ndev;
 377         int err = -ENOMEM;
 378
 379         ASSERT_RTNL();
 380
 381         if (dev->mtu < IPV6_MIN_MTU)
 382                 return ERR_PTR(-EINVAL);
 383
 384         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 385         if (!ndev)
 386                 return ERR_PTR(err);
 387
 388         rwlock_init(&ndev->lock);
 389         ndev->dev = dev;
 390         INIT_LIST_HEAD(&ndev->addr_list);
 391         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 392                     (unsigned long)ndev);
 393         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 394
 395         if (ndev->cnf.stable_secret.initialized)
 396                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 397         else
 398                 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
 399
 400         ndev->cnf.mtu6 = dev->mtu;
 401         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 402         if (!ndev->nd_parms) {
 403                 kfree(ndev);
 404                 return ERR_PTR(err);
 405         }
 406         if (ndev->cnf.forwarding)
 407                 dev_disable_lro(dev);
 408         /* We refer to the device */
 409         dev_hold(dev);
 410
 411         if (snmp6_alloc_dev(ndev) < 0) {
 412                 ADBG(KERN_WARNING
 413                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 414                         __func__, dev->name);
 415                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 416                 dev_put(dev);
 417                 kfree(ndev);
 418                 return ERR_PTR(err);
 419         }
 420
 421         if (snmp6_register_dev(ndev) < 0) {
 422                 ADBG(KERN_WARNING
 423                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 424                         __func__, dev->name);
 425                 goto err_release;
 426         }
 427
 428         /* One reference from device. */
 429         in6_dev_hold(ndev);
 430
 431         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 432                 ndev->cnf.accept_dad = -1;
 433
 434 #if IS_ENABLED(CONFIG_IPV6_SIT)
 435         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 436                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 437                 ndev->cnf.rtr_solicits = 0;
 438         }
 439 #endif
 440
 441         INIT_LIST_HEAD(&ndev->tempaddr_list);
 442         ndev->desync_factor = U32_MAX;
 443         if ((dev->flags&IFF_LOOPBACK) ||
 444             dev->type == ARPHRD_TUNNEL ||
 445             dev->type == ARPHRD_TUNNEL6 ||
 446             dev->type == ARPHRD_SIT ||
 447             dev->type == ARPHRD_NONE) {
 448                 ndev->cnf.use_tempaddr = -1;
 449         } else
 450                 ipv6_regen_rndid(ndev);
 451
 452         ndev->token = in6addr_any;
 453
 454         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 455                 ndev->if_flags |= IF_READY;
 456
 457         ipv6_mc_init_dev(ndev);
 458         ndev->tstamp = jiffies;
 459         err = addrconf_sysctl_register(ndev);
 460         if (err) {
 461                 ipv6_mc_destroy_dev(ndev);
 462                 snmp6_unregister_dev(ndev);
 463                 goto err_release;
 464         }
 465         /* protected by rtnl_lock */
 466         rcu_assign_pointer(dev->ip6_ptr, ndev);
 467
 468         /* Join interface-local all-node multicast group */
 469         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 470
 471         /* Join all-node multicast group */
 472         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 473
 474         /* Join all-router multicast group if forwarding is set */
 475         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 476                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 477
 478         return ndev;
 479
 480 err_release:
 481         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 482         ndev->dead = 1;
 483         in6_dev_finish_destroy(ndev);
 484         return ERR_PTR(err);
 485 }
 486
 487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 488 {
 489         struct inet6_dev *idev;
 490
 491         ASSERT_RTNL();
 492
 493         idev = __in6_dev_get(dev);
 494         if (!idev) {
 495                 idev = ipv6_add_dev(dev);
 496                 if (IS_ERR(idev))
 497                         return NULL;
 498         }
 499
 500         if (dev->flags&IFF_UP)
 501                 ipv6_mc_up(idev);
 502         return idev;
 503 }
 504
 505 static int inet6_netconf_msgsize_devconf(int type)
 506 {
 507         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 508                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 509         bool all = false;
 510
 511         if (type == NETCONFA_ALL)
 512                 all = true;
 513
 514         if (all || type == NETCONFA_FORWARDING)
 515                 size += nla_total_size(4);
 516 #ifdef CONFIG_IPV6_MROUTE
 517         if (all || type == NETCONFA_MC_FORWARDING)
 518                 size += nla_total_size(4);
 519 #endif
 520         if (all || type == NETCONFA_PROXY_NEIGH)
 521                 size += nla_total_size(4);
 522
 523         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 524                 size += nla_total_size(4);
 525
 526         return size;
 527 }
 528
 529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 530                                       struct ipv6_devconf *devconf, u32 portid,
 531                                       u32 seq, int event, unsigned int flags,
 532                                       int type)
 533 {
 534         struct nlmsghdr  *nlh;
 535         struct netconfmsg *ncm;
 536         bool all = false;
 537
 538         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 539                         flags);
 540         if (!nlh)
 541                 return -EMSGSIZE;
 542
 543         if (type == NETCONFA_ALL)
 544                 all = true;
 545
 546         ncm = nlmsg_data(nlh);
 547         ncm->ncm_family = AF_INET6;
 548
 549         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 550                 goto nla_put_failure;
 551
 552         if (!devconf)
 553                 goto out;
 554
 555         if ((all || type == NETCONFA_FORWARDING) &&
 556             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 557                 goto nla_put_failure;
 558 #ifdef CONFIG_IPV6_MROUTE
 559         if ((all || type == NETCONFA_MC_FORWARDING) &&
 560             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 561                         devconf->mc_forwarding) < 0)
 562                 goto nla_put_failure;
 563 #endif
 564         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 565             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 566                 goto nla_put_failure;
 567
 568         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 569             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 570                         devconf->ignore_routes_with_linkdown) < 0)
 571                 goto nla_put_failure;
 572
 573 out:
 574         nlmsg_end(skb, nlh);
 575         return 0;
 576
 577 nla_put_failure:
 578         nlmsg_cancel(skb, nlh);
 579         return -EMSGSIZE;
 580 }
 581
 582 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 583                                   int ifindex, struct ipv6_devconf *devconf)
 584 {
 585         struct sk_buff *skb;
 586         int err = -ENOBUFS;
 587
 588         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 589         if (!skb)
 590                 goto errout;
 591
 592         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 593                                          event, 0, type);
 594         if (err < 0) {
 595                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 596                 WARN_ON(err == -EMSGSIZE);
 597                 kfree_skb(skb);
 598                 goto errout;
 599         }
 600         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 601         return;
 602 errout:
 603         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 604 }
 605
 606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 607         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 608         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 609         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 610         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 611 };
 612
 613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 614                                      struct nlmsghdr *nlh,
 615                                      struct netlink_ext_ack *extack)
 616 {
 617         struct net *net = sock_net(in_skb->sk);
 618         struct nlattr *tb[NETCONFA_MAX+1];
 619         struct netconfmsg *ncm;
 620         struct sk_buff *skb;
 621         struct ipv6_devconf *devconf;
 622         struct inet6_dev *in6_dev;
 623         struct net_device *dev;
 624         int ifindex;
 625         int err;
 626
 627         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 628                           devconf_ipv6_policy, extack);
 629         if (err < 0)
 630                 goto errout;
 631
 632         err = -EINVAL;
 633         if (!tb[NETCONFA_IFINDEX])
 634                 goto errout;
 635
 636         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 637         switch (ifindex) {
 638         case NETCONFA_IFINDEX_ALL:
 639                 devconf = net->ipv6.devconf_all;
 640                 break;
 641         case NETCONFA_IFINDEX_DEFAULT:
 642                 devconf = net->ipv6.devconf_dflt;
 643                 break;
 644         default:
 645                 dev = __dev_get_by_index(net, ifindex);
 646                 if (!dev)
 647                         goto errout;
 648                 in6_dev = __in6_dev_get(dev);
 649                 if (!in6_dev)
 650                         goto errout;
 651                 devconf = &in6_dev->cnf;
 652                 break;
 653         }
 654
 655         err = -ENOBUFS;
 656         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
 657         if (!skb)
 658                 goto errout;
 659
 660         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 661                                          NETLINK_CB(in_skb).portid,
 662                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 663                                          NETCONFA_ALL);
 664         if (err < 0) {
 665                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 666                 WARN_ON(err == -EMSGSIZE);
 667                 kfree_skb(skb);
 668                 goto errout;
 669         }
 670         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 671 errout:
 672         return err;
 673 }
 674
 675 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 676                                       struct netlink_callback *cb)
 677 {
 678         struct net *net = sock_net(skb->sk);
 679         int h, s_h;
 680         int idx, s_idx;
 681         struct net_device *dev;
 682         struct inet6_dev *idev;
 683         struct hlist_head *head;
 684
 685         s_h = cb->args[0];
 686         s_idx = idx = cb->args[1];
 687
 688         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 689                 idx = 0;
 690                 head = &net->dev_index_head[h];
 691                 rcu_read_lock();
 692                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 693                           net->dev_base_seq;
 694                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 695                         if (idx < s_idx)
 696                                 goto cont;
 697                         idev = __in6_dev_get(dev);
 698                         if (!idev)
 699                                 goto cont;
 700
 701                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 702                                                        &idev->cnf,
 703                                                        NETLINK_CB(cb->skb).portid,
 704                                                        cb->nlh->nlmsg_seq,
 705                                                        RTM_NEWNETCONF,
 706                                                        NLM_F_MULTI,
 707                                                        NETCONFA_ALL) < 0) {
 708                                 rcu_read_unlock();
 709                                 goto done;
 710                         }
 711                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 712 cont:
 713                         idx++;
 714                 }
 715                 rcu_read_unlock();
 716         }
 717         if (h == NETDEV_HASHENTRIES) {
 718                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 719                                                net->ipv6.devconf_all,
 720                                                NETLINK_CB(cb->skb).portid,
 721                                                cb->nlh->nlmsg_seq,
 722                                                RTM_NEWNETCONF, NLM_F_MULTI,
 723                                                NETCONFA_ALL) < 0)
 724                         goto done;
 725                 else
 726                         h++;
 727         }
 728         if (h == NETDEV_HASHENTRIES + 1) {
 729                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 730                                                net->ipv6.devconf_dflt,
 731                                                NETLINK_CB(cb->skb).portid,
 732                                                cb->nlh->nlmsg_seq,
 733                                                RTM_NEWNETCONF, NLM_F_MULTI,
 734                                                NETCONFA_ALL) < 0)
 735                         goto done;
 736                 else
 737                         h++;
 738         }
 739 done:
 740         cb->args[0] = h;
 741         cb->args[1] = idx;
 742
 743         return skb->len;
 744 }
 745
 746 #ifdef CONFIG_SYSCTL
 747 static void dev_forward_change(struct inet6_dev *idev)
 748 {
 749         struct net_device *dev;
 750         struct inet6_ifaddr *ifa;
 751
 752         if (!idev)
 753                 return;
 754         dev = idev->dev;
 755         if (idev->cnf.forwarding)
 756                 dev_disable_lro(dev);
 757         if (dev->flags & IFF_MULTICAST) {
 758                 if (idev->cnf.forwarding) {
 759                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 760                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 761                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 762                 } else {
 763                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 764                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 765                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 766                 }
 767         }
 768
 769         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 770                 if (ifa->flags&IFA_F_TENTATIVE)
 771                         continue;
 772                 if (idev->cnf.forwarding)
 773                         addrconf_join_anycast(ifa);
 774                 else
 775                         addrconf_leave_anycast(ifa);
 776         }
 777         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 778                                      NETCONFA_FORWARDING,
 779                                      dev->ifindex, &idev->cnf);
 780 }
 781
 782
 783 static void addrconf_forward_change(struct net *net, __s32 newf)
 784 {
 785         struct net_device *dev;
 786         struct inet6_dev *idev;
 787
 788         for_each_netdev(net, dev) {
 789                 idev = __in6_dev_get(dev);
 790                 if (idev) {
 791                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 792                         idev->cnf.forwarding = newf;
 793                         if (changed)
 794                                 dev_forward_change(idev);
 795                 }
 796         }
 797 }
 798
 799 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 800 {
 801         struct net *net;
 802         int old;
 803
 804         if (!rtnl_trylock())
 805                 return restart_syscall();
 806
 807         net = (struct net *)table->extra2;
 808         old = *p;
 809         *p = newf;
 810
 811         if (p == &net->ipv6.devconf_dflt->forwarding) {
 812                 if ((!newf) ^ (!old))
 813                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 814                                                      NETCONFA_FORWARDING,
 815                                                      NETCONFA_IFINDEX_DEFAULT,
 816                                                      net->ipv6.devconf_dflt);
 817                 rtnl_unlock();
 818                 return 0;
 819         }
 820
 821         if (p == &net->ipv6.devconf_all->forwarding) {
 822                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 823
 824                 net->ipv6.devconf_dflt->forwarding = newf;
 825                 if ((!newf) ^ (!old_dflt))
 826                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 827                                                      NETCONFA_FORWARDING,
 828                                                      NETCONFA_IFINDEX_DEFAULT,
 829                                                      net->ipv6.devconf_dflt);
 830
 831                 addrconf_forward_change(net, newf);
 832                 if ((!newf) ^ (!old))
 833                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 834                                                      NETCONFA_FORWARDING,
 835                                                      NETCONFA_IFINDEX_ALL,
 836                                                      net->ipv6.devconf_all);
 837         } else if ((!newf) ^ (!old))
 838                 dev_forward_change((struct inet6_dev *)table->extra1);
 839         rtnl_unlock();
 840
 841         if (newf)
 842                 rt6_purge_dflt_routers(net);
 843         return 1;
 844 }
 845
 846 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 847 {
 848         struct net_device *dev;
 849         struct inet6_dev *idev;
 850
 851         for_each_netdev(net, dev) {
 852                 idev = __in6_dev_get(dev);
 853                 if (idev) {
 854                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 855
 856                         idev->cnf.ignore_routes_with_linkdown = newf;
 857                         if (changed)
 858                                 inet6_netconf_notify_devconf(dev_net(dev),
 859                                                              RTM_NEWNETCONF,
 860                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 861                                                              dev->ifindex,
 862                                                              &idev->cnf);
 863                 }
 864         }
 865 }
 866
 867 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 868 {
 869         struct net *net;
 870         int old;
 871
 872         if (!rtnl_trylock())
 873                 return restart_syscall();
 874
 875         net = (struct net *)table->extra2;
 876         old = *p;
 877         *p = newf;
 878
 879         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 880                 if ((!newf) ^ (!old))
 881                         inet6_netconf_notify_devconf(net,
 882                                                      RTM_NEWNETCONF,
 883                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 884                                                      NETCONFA_IFINDEX_DEFAULT,
 885                                                      net->ipv6.devconf_dflt);
 886                 rtnl_unlock();
 887                 return 0;
 888         }
 889
 890         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 891                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 892                 addrconf_linkdown_change(net, newf);
 893                 if ((!newf) ^ (!old))
 894                         inet6_netconf_notify_devconf(net,
 895                                                      RTM_NEWNETCONF,
 896                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 897                                                      NETCONFA_IFINDEX_ALL,
 898                                                      net->ipv6.devconf_all);
 899         }
 900         rtnl_unlock();
 901
 902         return 1;
 903 }
 904
 905 #endif
 906
 907 /* Nobody refers to this ifaddr, destroy it */
 908 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 909 {
 910         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 911
 912 #ifdef NET_REFCNT_DEBUG
 913         pr_debug("%s\n", __func__);
 914 #endif
 915
 916         in6_dev_put(ifp->idev);
 917
 918         if (cancel_delayed_work(&ifp->dad_work))
 919                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 920                           ifp);
 921
 922         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 923                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 924                 return;
 925         }
 926         ip6_rt_put(ifp->rt);
 927
 928         kfree_rcu(ifp, rcu);
 929 }
 930
 931 static void
 932 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 933 {
 934         struct list_head *p;
 935         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 936
 937         /*
 938          * Each device address list is sorted in order of scope -
 939          * global before linklocal.
 940          */
 941         list_for_each(p, &idev->addr_list) {
 942                 struct inet6_ifaddr *ifa
 943                         = list_entry(p, struct inet6_ifaddr, if_list);
 944                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 945                         break;
 946         }
 947
 948         list_add_tail(&ifp->if_list, p);
 949 }
 950
 951 static u32 inet6_addr_hash(const struct in6_addr *addr)
 952 {
 953         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 954 }
 955
 956 /* On success it returns ifp with increased reference count */
 957
 958 static struct inet6_ifaddr *
 959 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 960               const struct in6_addr *peer_addr, int pfxlen,
 961               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 962 {
 963         struct net *net = dev_net(idev->dev);
 964         struct inet6_ifaddr *ifa = NULL;
 965         struct rt6_info *rt;
 966         unsigned int hash;
 967         int err = 0;
 968         int addr_type = ipv6_addr_type(addr);
 969
 970         if (addr_type == IPV6_ADDR_ANY ||
 971             addr_type & IPV6_ADDR_MULTICAST ||
 972             (!(idev->dev->flags & IFF_LOOPBACK) &&
 973              addr_type & IPV6_ADDR_LOOPBACK))
 974                 return ERR_PTR(-EADDRNOTAVAIL);
 975
 976         rcu_read_lock_bh();
 977         if (idev->dead) {
 978                 err = -ENODEV;                  /*XXX*/
 979                 goto out2;
 980         }
 981
 982         if (idev->cnf.disable_ipv6) {
 983                 err = -EACCES;
 984                 goto out2;
 985         }
 986
 987         spin_lock(&addrconf_hash_lock);
 988
 989         /* Ignore adding duplicate addresses on an interface */
 990         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 991                 ADBG("ipv6_add_addr: already assigned\n");
 992                 err = -EEXIST;
 993                 goto out;
 994         }
 995
 996         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 997
 998         if (!ifa) {
 999                 ADBG("ipv6_add_addr: malloc failed\n");
1000                 err = -ENOBUFS;
1001                 goto out;
1002         }
1003
1004         rt = addrconf_dst_alloc(idev, addr, false);
1005         if (IS_ERR(rt)) {
1006                 err = PTR_ERR(rt);
1007                 goto out;
1008         }
1009
1010         if (net->ipv6.devconf_all->disable_policy ||
1011             idev->cnf.disable_policy)
1012                 rt->dst.flags |= DST_NOPOLICY;
1013
1014         neigh_parms_data_state_setall(idev->nd_parms);
1015
1016         ifa->addr = *addr;
1017         if (peer_addr)
1018                 ifa->peer_addr = *peer_addr;
1019
1020         spin_lock_init(&ifa->lock);
1021         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1022         INIT_HLIST_NODE(&ifa->addr_lst);
1023         ifa->scope = scope;
1024         ifa->prefix_len = pfxlen;
1025         ifa->flags = flags | IFA_F_TENTATIVE;
1026         ifa->valid_lft = valid_lft;
1027         ifa->prefered_lft = prefered_lft;
1028         ifa->cstamp = ifa->tstamp = jiffies;
1029         ifa->tokenized = false;
1030
1031         ifa->rt = rt;
1032
1033         ifa->idev = idev;
1034         in6_dev_hold(idev);
1035         /* For caller */
1036         in6_ifa_hold(ifa);
1037
1038         /* Add to big hash table */
1039         hash = inet6_addr_hash(addr);
1040
1041         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1042         spin_unlock(&addrconf_hash_lock);
1043
1044         write_lock(&idev->lock);
1045         /* Add to inet6_dev unicast addr list. */
1046         ipv6_link_dev_addr(idev, ifa);
1047
1048         if (ifa->flags&IFA_F_TEMPORARY) {
1049                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1050                 in6_ifa_hold(ifa);
1051         }
1052
1053         in6_ifa_hold(ifa);
1054         write_unlock(&idev->lock);
1055 out2:
1056         rcu_read_unlock_bh();
1057
1058         if (likely(err == 0))
1059                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1060         else {
1061                 kfree(ifa);
1062                 ifa = ERR_PTR(err);
1063         }
1064
1065         return ifa;
1066 out:
1067         spin_unlock(&addrconf_hash_lock);
1068         goto out2;
1069 }
1070
1071 enum cleanup_prefix_rt_t {
1072         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1073         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1074         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1075 };
1076
1077 /*
1078  * Check, whether the prefix for ifp would still need a prefix route
1079  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1080  * constants.
1081  *
1082  * 1) we don't purge prefix if address was not permanent.
1083  *    prefix is managed by its own lifetime.
1084  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1085  * 3) if there are no addresses, delete prefix.
1086  * 4) if there are still other permanent address(es),
1087  *    corresponding prefix is still permanent.
1088  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1089  *    don't purge the prefix, assume user space is managing it.
1090  * 6) otherwise, update prefix lifetime to the
1091  *    longest valid lifetime among the corresponding
1092  *    addresses on the device.
1093  *    Note: subsequent RA will update lifetime.
1094  **/
1095 static enum cleanup_prefix_rt_t
1096 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1097 {
1098         struct inet6_ifaddr *ifa;
1099         struct inet6_dev *idev = ifp->idev;
1100         unsigned long lifetime;
1101         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1102
1103         *expires = jiffies;
1104
1105         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1106                 if (ifa == ifp)
1107                         continue;
1108                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1109                                        ifp->prefix_len))
1110                         continue;
1111                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1112                         return CLEANUP_PREFIX_RT_NOP;
1113
1114                 action = CLEANUP_PREFIX_RT_EXPIRE;
1115
1116                 spin_lock(&ifa->lock);
1117
1118                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1119                 /*
1120                  * Note: Because this address is
1121                  * not permanent, lifetime <
1122                  * LONG_MAX / HZ here.
1123                  */
1124                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1125                         *expires = ifa->tstamp + lifetime * HZ;
1126                 spin_unlock(&ifa->lock);
1127         }
1128
1129         return action;
1130 }
1131
1132 static void
1133 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1134 {
1135         struct rt6_info *rt;
1136
1137         rt = addrconf_get_prefix_route(&ifp->addr,
1138                                        ifp->prefix_len,
1139                                        ifp->idev->dev,
1140                                        0, RTF_GATEWAY | RTF_DEFAULT);
1141         if (rt) {
1142                 if (del_rt)
1143                         ip6_del_rt(rt);
1144                 else {
1145                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1146                                 rt6_set_expires(rt, expires);
1147                         ip6_rt_put(rt);
1148                 }
1149         }
1150 }
1151
1152
1153 /* This function wants to get referenced ifp and releases it before return */
1154
1155 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1156 {
1157         int state;
1158         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1159         unsigned long expires;
1160
1161         ASSERT_RTNL();
1162
1163         spin_lock_bh(&ifp->lock);
1164         state = ifp->state;
1165         ifp->state = INET6_IFADDR_STATE_DEAD;
1166         spin_unlock_bh(&ifp->lock);
1167
1168         if (state == INET6_IFADDR_STATE_DEAD)
1169                 goto out;
1170
1171         spin_lock_bh(&addrconf_hash_lock);
1172         hlist_del_init_rcu(&ifp->addr_lst);
1173         spin_unlock_bh(&addrconf_hash_lock);
1174
1175         write_lock_bh(&ifp->idev->lock);
1176
1177         if (ifp->flags&IFA_F_TEMPORARY) {
1178                 list_del(&ifp->tmp_list);
1179                 if (ifp->ifpub) {
1180                         in6_ifa_put(ifp->ifpub);
1181                         ifp->ifpub = NULL;
1182                 }
1183                 __in6_ifa_put(ifp);
1184         }
1185
1186         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1187                 action = check_cleanup_prefix_route(ifp, &expires);
1188
1189         list_del_init(&ifp->if_list);
1190         __in6_ifa_put(ifp);
1191
1192         write_unlock_bh(&ifp->idev->lock);
1193
1194         addrconf_del_dad_work(ifp);
1195
1196         ipv6_ifa_notify(RTM_DELADDR, ifp);
1197
1198         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1199
1200         if (action != CLEANUP_PREFIX_RT_NOP) {
1201                 cleanup_prefix_route(ifp, expires,
1202                         action == CLEANUP_PREFIX_RT_DEL);
1203         }
1204
1205         /* clean up prefsrc entries */
1206         rt6_remove_prefsrc(ifp);
1207 out:
1208         in6_ifa_put(ifp);
1209 }
1210
1211 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1212 {
1213         struct inet6_dev *idev = ifp->idev;
1214         struct in6_addr addr, *tmpaddr;
1215         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1216         unsigned long regen_advance;
1217         int tmp_plen;
1218         int ret = 0;
1219         u32 addr_flags;
1220         unsigned long now = jiffies;
1221         long max_desync_factor;
1222         s32 cnf_temp_preferred_lft;
1223
1224         write_lock_bh(&idev->lock);
1225         if (ift) {
1226                 spin_lock_bh(&ift->lock);
1227                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1228                 spin_unlock_bh(&ift->lock);
1229                 tmpaddr = &addr;
1230         } else {
1231                 tmpaddr = NULL;
1232         }
1233 retry:
1234         in6_dev_hold(idev);
1235         if (idev->cnf.use_tempaddr <= 0) {
1236                 write_unlock_bh(&idev->lock);
1237                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1238                 in6_dev_put(idev);
1239                 ret = -1;
1240                 goto out;
1241         }
1242         spin_lock_bh(&ifp->lock);
1243         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1244                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1245                 spin_unlock_bh(&ifp->lock);
1246                 write_unlock_bh(&idev->lock);
1247                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1248                         __func__);
1249                 in6_dev_put(idev);
1250                 ret = -1;
1251                 goto out;
1252         }
1253         in6_ifa_hold(ifp);
1254         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1255         ipv6_try_regen_rndid(idev, tmpaddr);
1256         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1257         age = (now - ifp->tstamp) / HZ;
1258
1259         regen_advance = idev->cnf.regen_max_retry *
1260                         idev->cnf.dad_transmits *
1261                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1262
1263         /* recalculate max_desync_factor each time and update
1264          * idev->desync_factor if it's larger
1265          */
1266         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1267         max_desync_factor = min_t(__u32,
1268                                   idev->cnf.max_desync_factor,
1269                                   cnf_temp_preferred_lft - regen_advance);
1270
1271         if (unlikely(idev->desync_factor > max_desync_factor)) {
1272                 if (max_desync_factor > 0) {
1273                         get_random_bytes(&idev->desync_factor,
1274                                          sizeof(idev->desync_factor));
1275                         idev->desync_factor %= max_desync_factor;
1276                 } else {
1277                         idev->desync_factor = 0;
1278                 }
1279         }
1280
1281         tmp_valid_lft = min_t(__u32,
1282                               ifp->valid_lft,
1283                               idev->cnf.temp_valid_lft + age);
1284         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1285                             idev->desync_factor;
1286         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1287         tmp_plen = ifp->prefix_len;
1288         tmp_tstamp = ifp->tstamp;
1289         spin_unlock_bh(&ifp->lock);
1290
1291         write_unlock_bh(&idev->lock);
1292
1293         /* A temporary address is created only if this calculated Preferred
1294          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1295          * an implementation must not create a temporary address with a zero
1296          * Preferred Lifetime.
1297          * Use age calculation as in addrconf_verify to avoid unnecessary
1298          * temporary addresses being generated.
1299          */
1300         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1301         if (tmp_prefered_lft <= regen_advance + age) {
1302                 in6_ifa_put(ifp);
1303                 in6_dev_put(idev);
1304                 ret = -1;
1305                 goto out;
1306         }
1307
1308         addr_flags = IFA_F_TEMPORARY;
1309         /* set in addrconf_prefix_rcv() */
1310         if (ifp->flags & IFA_F_OPTIMISTIC)
1311                 addr_flags |= IFA_F_OPTIMISTIC;
1312
1313         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1314                             ipv6_addr_scope(&addr), addr_flags,
1315                             tmp_valid_lft, tmp_prefered_lft);
1316         if (IS_ERR(ift)) {
1317                 in6_ifa_put(ifp);
1318                 in6_dev_put(idev);
1319                 pr_info("%s: retry temporary address regeneration\n", __func__);
1320                 tmpaddr = &addr;
1321                 write_lock_bh(&idev->lock);
1322                 goto retry;
1323         }
1324
1325         spin_lock_bh(&ift->lock);
1326         ift->ifpub = ifp;
1327         ift->cstamp = now;
1328         ift->tstamp = tmp_tstamp;
1329         spin_unlock_bh(&ift->lock);
1330
1331         addrconf_dad_start(ift);
1332         in6_ifa_put(ift);
1333         in6_dev_put(idev);
1334 out:
1335         return ret;
1336 }
1337
1338 /*
1339  *      Choose an appropriate source address (RFC3484)
1340  */
1341 enum {
1342         IPV6_SADDR_RULE_INIT = 0,
1343         IPV6_SADDR_RULE_LOCAL,
1344         IPV6_SADDR_RULE_SCOPE,
1345         IPV6_SADDR_RULE_PREFERRED,
1346 #ifdef CONFIG_IPV6_MIP6
1347         IPV6_SADDR_RULE_HOA,
1348 #endif
1349         IPV6_SADDR_RULE_OIF,
1350         IPV6_SADDR_RULE_LABEL,
1351         IPV6_SADDR_RULE_PRIVACY,
1352         IPV6_SADDR_RULE_ORCHID,
1353         IPV6_SADDR_RULE_PREFIX,
1354 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1355         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1356 #endif
1357         IPV6_SADDR_RULE_MAX
1358 };
1359
1360 struct ipv6_saddr_score {
1361         int                     rule;
1362         int                     addr_type;
1363         struct inet6_ifaddr     *ifa;
1364         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1365         int                     scopedist;
1366         int                     matchlen;
1367 };
1368
1369 struct ipv6_saddr_dst {
1370         const struct in6_addr *addr;
1371         int ifindex;
1372         int scope;
1373         int label;
1374         unsigned int prefs;
1375 };
1376
1377 static inline int ipv6_saddr_preferred(int type)
1378 {
1379         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1380                 return 1;
1381         return 0;
1382 }
1383
1384 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1385 {
1386 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1387         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1388 #else
1389         return false;
1390 #endif
1391 }
1392
1393 static int ipv6_get_saddr_eval(struct net *net,
1394                                struct ipv6_saddr_score *score,
1395                                struct ipv6_saddr_dst *dst,
1396                                int i)
1397 {
1398         int ret;
1399
1400         if (i <= score->rule) {
1401                 switch (i) {
1402                 case IPV6_SADDR_RULE_SCOPE:
1403                         ret = score->scopedist;
1404                         break;
1405                 case IPV6_SADDR_RULE_PREFIX:
1406                         ret = score->matchlen;
1407                         break;
1408                 default:
1409                         ret = !!test_bit(i, score->scorebits);
1410                 }
1411                 goto out;
1412         }
1413
1414         switch (i) {
1415         case IPV6_SADDR_RULE_INIT:
1416                 /* Rule 0: remember if hiscore is not ready yet */
1417                 ret = !!score->ifa;
1418                 break;
1419         case IPV6_SADDR_RULE_LOCAL:
1420                 /* Rule 1: Prefer same address */
1421                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1422                 break;
1423         case IPV6_SADDR_RULE_SCOPE:
1424                 /* Rule 2: Prefer appropriate scope
1425                  *
1426                  *      ret
1427                  *       ^
1428                  *    -1 |  d 15
1429                  *    ---+--+-+---> scope
1430                  *       |
1431                  *       |             d is scope of the destination.
1432                  *  B-d  |  \
1433                  *       |   \      <- smaller scope is better if
1434                  *  B-15 |    \        if scope is enough for destination.
1435                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1436                  * d-C-1 | /
1437                  *       |/         <- greater is better
1438                  *   -C  /             if scope is not enough for destination.
1439                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1440                  *
1441                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1442                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1443                  * Assume B = 0 and we get C > 29.
1444                  */
1445                 ret = __ipv6_addr_src_scope(score->addr_type);
1446                 if (ret >= dst->scope)
1447                         ret = -ret;
1448                 else
1449                         ret -= 128;     /* 30 is enough */
1450                 score->scopedist = ret;
1451                 break;
1452         case IPV6_SADDR_RULE_PREFERRED:
1453             {
1454                 /* Rule 3: Avoid deprecated and optimistic addresses */
1455                 u8 avoid = IFA_F_DEPRECATED;
1456
1457                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1458                         avoid |= IFA_F_OPTIMISTIC;
1459                 ret = ipv6_saddr_preferred(score->addr_type) ||
1460                       !(score->ifa->flags & avoid);
1461                 break;
1462             }
1463 #ifdef CONFIG_IPV6_MIP6
1464         case IPV6_SADDR_RULE_HOA:
1465             {
1466                 /* Rule 4: Prefer home address */
1467                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1468                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1469                 break;
1470             }
1471 #endif
1472         case IPV6_SADDR_RULE_OIF:
1473                 /* Rule 5: Prefer outgoing interface */
1474                 ret = (!dst->ifindex ||
1475                        dst->ifindex == score->ifa->idev->dev->ifindex);
1476                 break;
1477         case IPV6_SADDR_RULE_LABEL:
1478                 /* Rule 6: Prefer matching label */
1479                 ret = ipv6_addr_label(net,
1480                                       &score->ifa->addr, score->addr_type,
1481                                       score->ifa->idev->dev->ifindex) == dst->label;
1482                 break;
1483         case IPV6_SADDR_RULE_PRIVACY:
1484             {
1485                 /* Rule 7: Prefer public address
1486                  * Note: prefer temporary address if use_tempaddr >= 2
1487                  */
1488                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1489                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1490                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1491                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1492                 break;
1493             }
1494         case IPV6_SADDR_RULE_ORCHID:
1495                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1496                  *          non-ORCHID vs non-ORCHID
1497                  */
1498                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1499                         ipv6_addr_orchid(dst->addr));
1500                 break;
1501         case IPV6_SADDR_RULE_PREFIX:
1502                 /* Rule 8: Use longest matching prefix */
1503                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1504                 if (ret > score->ifa->prefix_len)
1505                         ret = score->ifa->prefix_len;
1506                 score->matchlen = ret;
1507                 break;
1508 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1509         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1510                 /* Optimistic addresses still have lower precedence than other
1511                  * preferred addresses.
1512                  */
1513                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1514                 break;
1515 #endif
1516         default:
1517                 ret = 0;
1518         }
1519
1520         if (ret)
1521                 __set_bit(i, score->scorebits);
1522         score->rule = i;
1523 out:
1524         return ret;
1525 }
1526
1527 static int __ipv6_dev_get_saddr(struct net *net,
1528                                 struct ipv6_saddr_dst *dst,
1529                                 struct inet6_dev *idev,
1530                                 struct ipv6_saddr_score *scores,
1531                                 int hiscore_idx)
1532 {
1533         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1534
1535         read_lock_bh(&idev->lock);
1536         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1537                 int i;
1538
1539                 /*
1540                  * - Tentative Address (RFC2462 section 5.4)
1541                  *  - A tentative address is not considered
1542                  *    "assigned to an interface" in the traditional
1543                  *    sense, unless it is also flagged as optimistic.
1544                  * - Candidate Source Address (section 4)
1545                  *  - In any case, anycast addresses, multicast
1546                  *    addresses, and the unspecified address MUST
1547                  *    NOT be included in a candidate set.
1548                  */
1549                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1550                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1551                         continue;
1552
1553                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1554
1555                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1556                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1557                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1558                                             idev->dev->name);
1559                         continue;
1560                 }
1561
1562                 score->rule = -1;
1563                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1564
1565                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1566                         int minihiscore, miniscore;
1567
1568                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1569                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1570
1571                         if (minihiscore > miniscore) {
1572                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1573                                     score->scopedist > 0) {
1574                                         /*
1575                                          * special case:
1576                                          * each remaining entry
1577                                          * has too small (not enough)
1578                                          * scope, because ifa entries
1579                                          * are sorted by their scope
1580                                          * values.
1581                                          */
1582                                         goto out;
1583                                 }
1584                                 break;
1585                         } else if (minihiscore < miniscore) {
1586                                 if (hiscore->ifa)
1587                                         in6_ifa_put(hiscore->ifa);
1588
1589                                 in6_ifa_hold(score->ifa);
1590
1591                                 swap(hiscore, score);
1592                                 hiscore_idx = 1 - hiscore_idx;
1593
1594                                 /* restore our iterator */
1595                                 score->ifa = hiscore->ifa;
1596
1597                                 break;
1598                         }
1599                 }
1600         }
1601 out:
1602         read_unlock_bh(&idev->lock);
1603         return hiscore_idx;
1604 }
1605
1606 static int ipv6_get_saddr_master(struct net *net,
1607                                  const struct net_device *dst_dev,
1608                                  const struct net_device *master,
1609                                  struct ipv6_saddr_dst *dst,
1610                                  struct ipv6_saddr_score *scores,
1611                                  int hiscore_idx)
1612 {
1613         struct inet6_dev *idev;
1614
1615         idev = __in6_dev_get(dst_dev);
1616         if (idev)
1617                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1618                                                    scores, hiscore_idx);
1619
1620         idev = __in6_dev_get(master);
1621         if (idev)
1622                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1623                                                    scores, hiscore_idx);
1624
1625         return hiscore_idx;
1626 }
1627
1628 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1629                        const struct in6_addr *daddr, unsigned int prefs,
1630                        struct in6_addr *saddr)
1631 {
1632         struct ipv6_saddr_score scores[2], *hiscore;
1633         struct ipv6_saddr_dst dst;
1634         struct inet6_dev *idev;
1635         struct net_device *dev;
1636         int dst_type;
1637         bool use_oif_addr = false;
1638         int hiscore_idx = 0;
1639
1640         dst_type = __ipv6_addr_type(daddr);
1641         dst.addr = daddr;
1642         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1643         dst.scope = __ipv6_addr_src_scope(dst_type);
1644         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1645         dst.prefs = prefs;
1646
1647         scores[hiscore_idx].rule = -1;
1648         scores[hiscore_idx].ifa = NULL;
1649
1650         rcu_read_lock();
1651
1652         /* Candidate Source Address (section 4)
1653          *  - multicast and link-local destination address,
1654          *    the set of candidate source address MUST only
1655          *    include addresses assigned to interfaces
1656          *    belonging to the same link as the outgoing
1657          *    interface.
1658          * (- For site-local destination addresses, the
1659          *    set of candidate source addresses MUST only
1660          *    include addresses assigned to interfaces
1661          *    belonging to the same site as the outgoing
1662          *    interface.)
1663          *  - "It is RECOMMENDED that the candidate source addresses
1664          *    be the set of unicast addresses assigned to the
1665          *    interface that will be used to send to the destination
1666          *    (the 'outgoing' interface)." (RFC 6724)
1667          */
1668         if (dst_dev) {
1669                 idev = __in6_dev_get(dst_dev);
1670                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1671                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1672                     (idev && idev->cnf.use_oif_addrs_only)) {
1673                         use_oif_addr = true;
1674                 }
1675         }
1676
1677         if (use_oif_addr) {
1678                 if (idev)
1679                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1680         } else {
1681                 const struct net_device *master;
1682                 int master_idx = 0;
1683
1684                 /* if dst_dev exists and is enslaved to an L3 device, then
1685                  * prefer addresses from dst_dev and then the master over
1686                  * any other enslaved devices in the L3 domain.
1687                  */
1688                 master = l3mdev_master_dev_rcu(dst_dev);
1689                 if (master) {
1690                         master_idx = master->ifindex;
1691
1692                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1693                                                             master, &dst,
1694                                                             scores, hiscore_idx);
1695
1696                         if (scores[hiscore_idx].ifa)
1697                                 goto out;
1698                 }
1699
1700                 for_each_netdev_rcu(net, dev) {
1701                         /* only consider addresses on devices in the
1702                          * same L3 domain
1703                          */
1704                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1705                                 continue;
1706                         idev = __in6_dev_get(dev);
1707                         if (!idev)
1708                                 continue;
1709                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1710                 }
1711         }
1712
1713 out:
1714         rcu_read_unlock();
1715
1716         hiscore = &scores[hiscore_idx];
1717         if (!hiscore->ifa)
1718                 return -EADDRNOTAVAIL;
1719
1720         *saddr = hiscore->ifa->addr;
1721         in6_ifa_put(hiscore->ifa);
1722         return 0;
1723 }
1724 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1725
1726 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1727                       u32 banned_flags)
1728 {
1729         struct inet6_ifaddr *ifp;
1730         int err = -EADDRNOTAVAIL;
1731
1732         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1733                 if (ifp->scope > IFA_LINK)
1734                         break;
1735                 if (ifp->scope == IFA_LINK &&
1736                     !(ifp->flags & banned_flags)) {
1737                         *addr = ifp->addr;
1738                         err = 0;
1739                         break;
1740                 }
1741         }
1742         return err;
1743 }
1744
1745 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1746                     u32 banned_flags)
1747 {
1748         struct inet6_dev *idev;
1749         int err = -EADDRNOTAVAIL;
1750
1751         rcu_read_lock();
1752         idev = __in6_dev_get(dev);
1753         if (idev) {
1754                 read_lock_bh(&idev->lock);
1755                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1756                 read_unlock_bh(&idev->lock);
1757         }
1758         rcu_read_unlock();
1759         return err;
1760 }
1761
1762 static int ipv6_count_addresses(struct inet6_dev *idev)
1763 {
1764         int cnt = 0;
1765         struct inet6_ifaddr *ifp;
1766
1767         read_lock_bh(&idev->lock);
1768         list_for_each_entry(ifp, &idev->addr_list, if_list)
1769                 cnt++;
1770         read_unlock_bh(&idev->lock);
1771         return cnt;
1772 }
1773
1774 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1775                   const struct net_device *dev, int strict)
1776 {
1777         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1778 }
1779 EXPORT_SYMBOL(ipv6_chk_addr);
1780
1781 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1782                             const struct net_device *dev, int strict,
1783                             u32 banned_flags)
1784 {
1785         struct inet6_ifaddr *ifp;
1786         unsigned int hash = inet6_addr_hash(addr);
1787         u32 ifp_flags;
1788
1789         rcu_read_lock_bh();
1790         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1791                 if (!net_eq(dev_net(ifp->idev->dev), net))
1792                         continue;
1793                 /* Decouple optimistic from tentative for evaluation here.
1794                  * Ban optimistic addresses explicitly, when required.
1795                  */
1796                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1797                             ? (ifp->flags&~IFA_F_TENTATIVE)
1798                             : ifp->flags;
1799                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1800                     !(ifp_flags&banned_flags) &&
1801                     (!dev || ifp->idev->dev == dev ||
1802                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1803                         rcu_read_unlock_bh();
1804                         return 1;
1805                 }
1806         }
1807
1808         rcu_read_unlock_bh();
1809         return 0;
1810 }
1811 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1812
1813 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1814                                struct net_device *dev)
1815 {
1816         unsigned int hash = inet6_addr_hash(addr);
1817         struct inet6_ifaddr *ifp;
1818
1819         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1820                 if (!net_eq(dev_net(ifp->idev->dev), net))
1821                         continue;
1822                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1823                         if (!dev || ifp->idev->dev == dev)
1824                                 return true;
1825                 }
1826         }
1827         return false;
1828 }
1829
1830 /* Compares an address/prefix_len with addresses on device @dev.
1831  * If one is found it returns true.
1832  */
1833 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1834         const unsigned int prefix_len, struct net_device *dev)
1835 {
1836         struct inet6_dev *idev;
1837         struct inet6_ifaddr *ifa;
1838         bool ret = false;
1839
1840         rcu_read_lock();
1841         idev = __in6_dev_get(dev);
1842         if (idev) {
1843                 read_lock_bh(&idev->lock);
1844                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1845                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1846                         if (ret)
1847                                 break;
1848                 }
1849                 read_unlock_bh(&idev->lock);
1850         }
1851         rcu_read_unlock();
1852
1853         return ret;
1854 }
1855 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1856
1857 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1858 {
1859         struct inet6_dev *idev;
1860         struct inet6_ifaddr *ifa;
1861         int     onlink;
1862
1863         onlink = 0;
1864         rcu_read_lock();
1865         idev = __in6_dev_get(dev);
1866         if (idev) {
1867                 read_lock_bh(&idev->lock);
1868                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1869                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1870                                                    ifa->prefix_len);
1871                         if (onlink)
1872                                 break;
1873                 }
1874                 read_unlock_bh(&idev->lock);
1875         }
1876         rcu_read_unlock();
1877         return onlink;
1878 }
1879 EXPORT_SYMBOL(ipv6_chk_prefix);
1880
1881 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1882                                      struct net_device *dev, int strict)
1883 {
1884         struct inet6_ifaddr *ifp, *result = NULL;
1885         unsigned int hash = inet6_addr_hash(addr);
1886
1887         rcu_read_lock_bh();
1888         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1889                 if (!net_eq(dev_net(ifp->idev->dev), net))
1890                         continue;
1891                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1892                         if (!dev || ifp->idev->dev == dev ||
1893                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1894                                 result = ifp;
1895                                 in6_ifa_hold(ifp);
1896                                 break;
1897                         }
1898                 }
1899         }
1900         rcu_read_unlock_bh();
1901
1902         return result;
1903 }
1904
1905 /* Gets referenced address, destroys ifaddr */
1906
1907 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1908 {
1909         if (dad_failed)
1910                 ifp->flags |= IFA_F_DADFAILED;
1911
1912         if (ifp->flags&IFA_F_PERMANENT) {
1913                 spin_lock_bh(&ifp->lock);
1914                 addrconf_del_dad_work(ifp);
1915                 ifp->flags |= IFA_F_TENTATIVE;
1916                 spin_unlock_bh(&ifp->lock);
1917                 if (dad_failed)
1918                         ipv6_ifa_notify(0, ifp);
1919                 in6_ifa_put(ifp);
1920         } else if (ifp->flags&IFA_F_TEMPORARY) {
1921                 struct inet6_ifaddr *ifpub;
1922                 spin_lock_bh(&ifp->lock);
1923                 ifpub = ifp->ifpub;
1924                 if (ifpub) {
1925                         in6_ifa_hold(ifpub);
1926                         spin_unlock_bh(&ifp->lock);
1927                         ipv6_create_tempaddr(ifpub, ifp);
1928                         in6_ifa_put(ifpub);
1929                 } else {
1930                         spin_unlock_bh(&ifp->lock);
1931                 }
1932                 ipv6_del_addr(ifp);
1933         } else {
1934                 ipv6_del_addr(ifp);
1935         }
1936 }
1937
1938 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1939 {
1940         int err = -ENOENT;
1941
1942         spin_lock_bh(&ifp->lock);
1943         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1944                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1945                 err = 0;
1946         }
1947         spin_unlock_bh(&ifp->lock);
1948
1949         return err;
1950 }
1951
1952 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1953 {
1954         struct inet6_dev *idev = ifp->idev;
1955         struct net *net = dev_net(ifp->idev->dev);
1956
1957         if (addrconf_dad_end(ifp)) {
1958                 in6_ifa_put(ifp);
1959                 return;
1960         }
1961
1962         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1963                              ifp->idev->dev->name, &ifp->addr);
1964
1965         spin_lock_bh(&ifp->lock);
1966
1967         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1968                 int scope = ifp->scope;
1969                 u32 flags = ifp->flags;
1970                 struct in6_addr new_addr;
1971                 struct inet6_ifaddr *ifp2;
1972                 u32 valid_lft, preferred_lft;
1973                 int pfxlen = ifp->prefix_len;
1974                 int retries = ifp->stable_privacy_retry + 1;
1975
1976                 if (retries > net->ipv6.sysctl.idgen_retries) {
1977                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1978                                              ifp->idev->dev->name);
1979                         goto errdad;
1980                 }
1981
1982                 new_addr = ifp->addr;
1983                 if (ipv6_generate_stable_address(&new_addr, retries,
1984                                                  idev))
1985                         goto errdad;
1986
1987                 valid_lft = ifp->valid_lft;
1988                 preferred_lft = ifp->prefered_lft;
1989
1990                 spin_unlock_bh(&ifp->lock);
1991
1992                 if (idev->cnf.max_addresses &&
1993                     ipv6_count_addresses(idev) >=
1994                     idev->cnf.max_addresses)
1995                         goto lock_errdad;
1996
1997                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1998                                      ifp->idev->dev->name);
1999
2000                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2001                                      scope, flags, valid_lft,
2002                                      preferred_lft);
2003                 if (IS_ERR(ifp2))
2004                         goto lock_errdad;
2005
2006                 spin_lock_bh(&ifp2->lock);
2007                 ifp2->stable_privacy_retry = retries;
2008                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2009                 spin_unlock_bh(&ifp2->lock);
2010
2011                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2012                 in6_ifa_put(ifp2);
2013 lock_errdad:
2014                 spin_lock_bh(&ifp->lock);
2015         }
2016
2017 errdad:
2018         /* transition from _POSTDAD to _ERRDAD */
2019         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2020         spin_unlock_bh(&ifp->lock);
2021
2022         addrconf_mod_dad_work(ifp, 0);
2023         in6_ifa_put(ifp);
2024 }
2025
2026 /* Join to solicited addr multicast group.
2027  * caller must hold RTNL */
2028 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2029 {
2030         struct in6_addr maddr;
2031
2032         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2033                 return;
2034
2035         addrconf_addr_solict_mult(addr, &maddr);
2036         ipv6_dev_mc_inc(dev, &maddr);
2037 }
2038
2039 /* caller must hold RTNL */
2040 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2041 {
2042         struct in6_addr maddr;
2043
2044         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2045                 return;
2046
2047         addrconf_addr_solict_mult(addr, &maddr);
2048         __ipv6_dev_mc_dec(idev, &maddr);
2049 }
2050
2051 /* caller must hold RTNL */
2052 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2053 {
2054         struct in6_addr addr;
2055
2056         if (ifp->prefix_len >= 127) /* RFC 6164 */
2057                 return;
2058         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2059         if (ipv6_addr_any(&addr))
2060                 return;
2061         __ipv6_dev_ac_inc(ifp->idev, &addr);
2062 }
2063
2064 /* caller must hold RTNL */
2065 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2066 {
2067         struct in6_addr addr;
2068
2069         if (ifp->prefix_len >= 127) /* RFC 6164 */
2070                 return;
2071         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2072         if (ipv6_addr_any(&addr))
2073                 return;
2074         __ipv6_dev_ac_dec(ifp->idev, &addr);
2075 }
2076
2077 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2078 {
2079         switch (dev->addr_len) {
2080         case ETH_ALEN:
2081                 memcpy(eui, dev->dev_addr, 3);
2082                 eui[3] = 0xFF;
2083                 eui[4] = 0xFE;
2084                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2085                 break;
2086         case EUI64_ADDR_LEN:
2087                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2088                 eui[0] ^= 2;
2089                 break;
2090         default:
2091                 return -1;
2092         }
2093
2094         return 0;
2095 }
2096
2097 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2098 {
2099         union fwnet_hwaddr *ha;
2100
2101         if (dev->addr_len != FWNET_ALEN)
2102                 return -1;
2103
2104         ha = (union fwnet_hwaddr *)dev->dev_addr;
2105
2106         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2107         eui[0] ^= 2;
2108         return 0;
2109 }
2110
2111 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2112 {
2113         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2114         if (dev->addr_len != ARCNET_ALEN)
2115                 return -1;
2116         memset(eui, 0, 7);
2117         eui[7] = *(u8 *)dev->dev_addr;
2118         return 0;
2119 }
2120
2121 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2122 {
2123         if (dev->addr_len != INFINIBAND_ALEN)
2124                 return -1;
2125         memcpy(eui, dev->dev_addr + 12, 8);
2126         eui[0] |= 2;
2127         return 0;
2128 }
2129
2130 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2131 {
2132         if (addr == 0)
2133                 return -1;
2134         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2135                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2136                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2137                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2138                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2139                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2140         eui[1] = 0;
2141         eui[2] = 0x5E;
2142         eui[3] = 0xFE;
2143         memcpy(eui + 4, &addr, 4);
2144         return 0;
2145 }
2146
2147 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2148 {
2149         if (dev->priv_flags & IFF_ISATAP)
2150                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2151         return -1;
2152 }
2153
2154 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2155 {
2156         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2157 }
2158
2159 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2160 {
2161         memcpy(eui, dev->perm_addr, 3);
2162         memcpy(eui + 5, dev->perm_addr + 3, 3);
2163         eui[3] = 0xFF;
2164         eui[4] = 0xFE;
2165         eui[0] ^= 2;
2166         return 0;
2167 }
2168
2169 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2170 {
2171         switch (dev->type) {
2172         case ARPHRD_ETHER:
2173         case ARPHRD_FDDI:
2174                 return addrconf_ifid_eui48(eui, dev);
2175         case ARPHRD_ARCNET:
2176                 return addrconf_ifid_arcnet(eui, dev);
2177         case ARPHRD_INFINIBAND:
2178                 return addrconf_ifid_infiniband(eui, dev);
2179         case ARPHRD_SIT:
2180                 return addrconf_ifid_sit(eui, dev);
2181         case ARPHRD_IPGRE:
2182         case ARPHRD_TUNNEL:
2183                 return addrconf_ifid_gre(eui, dev);
2184         case ARPHRD_6LOWPAN:
2185                 return addrconf_ifid_6lowpan(eui, dev);
2186         case ARPHRD_IEEE1394:
2187                 return addrconf_ifid_ieee1394(eui, dev);
2188         case ARPHRD_TUNNEL6:
2189         case ARPHRD_IP6GRE:
2190                 return addrconf_ifid_ip6tnl(eui, dev);
2191         }
2192         return -1;
2193 }
2194
2195 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2196 {
2197         int err = -1;
2198         struct inet6_ifaddr *ifp;
2199
2200         read_lock_bh(&idev->lock);
2201         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2202                 if (ifp->scope > IFA_LINK)
2203                         break;
2204                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2205                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2206                         err = 0;
2207                         break;
2208                 }
2209         }
2210         read_unlock_bh(&idev->lock);
2211         return err;
2212 }
2213
2214 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2215 static void ipv6_regen_rndid(struct inet6_dev *idev)
2216 {
2217 regen:
2218         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2219         idev->rndid[0] &= ~0x02;
2220
2221         /*
2222          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2223          * check if generated address is not inappropriate
2224          *
2225          *  - Reserved subnet anycast (RFC 2526)
2226          *      11111101 11....11 1xxxxxxx
2227          *  - ISATAP (RFC4214) 6.1
2228          *      00-00-5E-FE-xx-xx-xx-xx
2229          *  - value 0
2230          *  - XXX: already assigned to an address on the device
2231          */
2232         if (idev->rndid[0] == 0xfd &&
2233             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2234             (idev->rndid[7]&0x80))
2235                 goto regen;
2236         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2237                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2238                         goto regen;
2239                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2240                         goto regen;
2241         }
2242 }
2243
2244 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2245 {
2246         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2247                 ipv6_regen_rndid(idev);
2248 }
2249
2250 /*
2251  *      Add prefix route.
2252  */
2253
2254 static void
2255 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2256                       unsigned long expires, u32 flags)
2257 {
2258         struct fib6_config cfg = {
2259                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2260                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2261                 .fc_ifindex = dev->ifindex,
2262                 .fc_expires = expires,
2263                 .fc_dst_len = plen,
2264                 .fc_flags = RTF_UP | flags,
2265                 .fc_nlinfo.nl_net = dev_net(dev),
2266                 .fc_protocol = RTPROT_KERNEL,
2267         };
2268
2269         cfg.fc_dst = *pfx;
2270
2271         /* Prevent useless cloning on PtP SIT.
2272            This thing is done here expecting that the whole
2273            class of non-broadcast devices need not cloning.
2274          */
2275 #if IS_ENABLED(CONFIG_IPV6_SIT)
2276         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2277                 cfg.fc_flags |= RTF_NONEXTHOP;
2278 #endif
2279
2280         ip6_route_add(&cfg);
2281 }
2282
2283
2284 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2285                                                   int plen,
2286                                                   const struct net_device *dev,
2287                                                   u32 flags, u32 noflags)
2288 {
2289         struct fib6_node *fn;
2290         struct rt6_info *rt = NULL;
2291         struct fib6_table *table;
2292         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2293
2294         table = fib6_get_table(dev_net(dev), tb_id);
2295         if (!table)
2296                 return NULL;
2297
2298         read_lock_bh(&table->tb6_lock);
2299         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2300         if (!fn)
2301                 goto out;
2302
2303         noflags |= RTF_CACHE;
2304         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2305                 if (rt->dst.dev->ifindex != dev->ifindex)
2306                         continue;
2307                 if ((rt->rt6i_flags & flags) != flags)
2308                         continue;
2309                 if ((rt->rt6i_flags & noflags) != 0)
2310                         continue;
2311                 dst_hold(&rt->dst);
2312                 break;
2313         }
2314 out:
2315         read_unlock_bh(&table->tb6_lock);
2316         return rt;
2317 }
2318
2319
2320 /* Create "default" multicast route to the interface */
2321
2322 static void addrconf_add_mroute(struct net_device *dev)
2323 {
2324         struct fib6_config cfg = {
2325                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2326                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2327                 .fc_ifindex = dev->ifindex,
2328                 .fc_dst_len = 8,
2329                 .fc_flags = RTF_UP,
2330                 .fc_nlinfo.nl_net = dev_net(dev),
2331         };
2332
2333         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2334
2335         ip6_route_add(&cfg);
2336 }
2337
2338 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2339 {
2340         struct inet6_dev *idev;
2341
2342         ASSERT_RTNL();
2343
2344         idev = ipv6_find_idev(dev);
2345         if (!idev)
2346                 return ERR_PTR(-ENOBUFS);
2347
2348         if (idev->cnf.disable_ipv6)
2349                 return ERR_PTR(-EACCES);
2350
2351         /* Add default multicast route */
2352         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2353                 addrconf_add_mroute(dev);
2354
2355         return idev;
2356 }
2357
2358 static void manage_tempaddrs(struct inet6_dev *idev,
2359                              struct inet6_ifaddr *ifp,
2360                              __u32 valid_lft, __u32 prefered_lft,
2361                              bool create, unsigned long now)
2362 {
2363         u32 flags;
2364         struct inet6_ifaddr *ift;
2365
2366         read_lock_bh(&idev->lock);
2367         /* update all temporary addresses in the list */
2368         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2369                 int age, max_valid, max_prefered;
2370
2371                 if (ifp != ift->ifpub)
2372                         continue;
2373
2374                 /* RFC 4941 section 3.3:
2375                  * If a received option will extend the lifetime of a public
2376                  * address, the lifetimes of temporary addresses should
2377                  * be extended, subject to the overall constraint that no
2378                  * temporary addresses should ever remain "valid" or "preferred"
2379                  * for a time longer than (TEMP_VALID_LIFETIME) or
2380                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2381                  */
2382                 age = (now - ift->cstamp) / HZ;
2383                 max_valid = idev->cnf.temp_valid_lft - age;
2384                 if (max_valid < 0)
2385                         max_valid = 0;
2386
2387                 max_prefered = idev->cnf.temp_prefered_lft -
2388                                idev->desync_factor - age;
2389                 if (max_prefered < 0)
2390                         max_prefered = 0;
2391
2392                 if (valid_lft > max_valid)
2393                         valid_lft = max_valid;
2394
2395                 if (prefered_lft > max_prefered)
2396                         prefered_lft = max_prefered;
2397
2398                 spin_lock(&ift->lock);
2399                 flags = ift->flags;
2400                 ift->valid_lft = valid_lft;
2401                 ift->prefered_lft = prefered_lft;
2402                 ift->tstamp = now;
2403                 if (prefered_lft > 0)
2404                         ift->flags &= ~IFA_F_DEPRECATED;
2405
2406                 spin_unlock(&ift->lock);
2407                 if (!(flags&IFA_F_TENTATIVE))
2408                         ipv6_ifa_notify(0, ift);
2409         }
2410
2411         if ((create || list_empty(&idev->tempaddr_list)) &&
2412             idev->cnf.use_tempaddr > 0) {
2413                 /* When a new public address is created as described
2414                  * in [ADDRCONF], also create a new temporary address.
2415                  * Also create a temporary address if it's enabled but
2416                  * no temporary address currently exists.
2417                  */
2418                 read_unlock_bh(&idev->lock);
2419                 ipv6_create_tempaddr(ifp, NULL);
2420         } else {
2421                 read_unlock_bh(&idev->lock);
2422         }
2423 }
2424
2425 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2426 {
2427         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2428                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2429 }
2430
2431 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2432                                  const struct prefix_info *pinfo,
2433                                  struct inet6_dev *in6_dev,
2434                                  const struct in6_addr *addr, int addr_type,
2435                                  u32 addr_flags, bool sllao, bool tokenized,
2436                                  __u32 valid_lft, u32 prefered_lft)
2437 {
2438         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2439         int create = 0, update_lft = 0;
2440
2441         if (!ifp && valid_lft) {
2442                 int max_addresses = in6_dev->cnf.max_addresses;
2443
2444 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2445                 if (in6_dev->cnf.optimistic_dad &&
2446                     !net->ipv6.devconf_all->forwarding && sllao)
2447                         addr_flags |= IFA_F_OPTIMISTIC;
2448 #endif
2449
2450                 /* Do not allow to create too much of autoconfigured
2451                  * addresses; this would be too easy way to crash kernel.
2452                  */
2453                 if (!max_addresses ||
2454                     ipv6_count_addresses(in6_dev) < max_addresses)
2455                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2456                                             pinfo->prefix_len,
2457                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2458                                             addr_flags, valid_lft,
2459                                             prefered_lft);
2460
2461                 if (IS_ERR_OR_NULL(ifp))
2462                         return -1;
2463
2464                 update_lft = 0;
2465                 create = 1;
2466                 spin_lock_bh(&ifp->lock);
2467                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2468                 ifp->cstamp = jiffies;
2469                 ifp->tokenized = tokenized;
2470                 spin_unlock_bh(&ifp->lock);
2471                 addrconf_dad_start(ifp);
2472         }
2473
2474         if (ifp) {
2475                 u32 flags;
2476                 unsigned long now;
2477                 u32 stored_lft;
2478
2479                 /* update lifetime (RFC2462 5.5.3 e) */
2480                 spin_lock_bh(&ifp->lock);
2481                 now = jiffies;
2482                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2483                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2484                 else
2485                         stored_lft = 0;
2486                 if (!update_lft && !create && stored_lft) {
2487                         const u32 minimum_lft = min_t(u32,
2488                                 stored_lft, MIN_VALID_LIFETIME);
2489                         valid_lft = max(valid_lft, minimum_lft);
2490
2491                         /* RFC4862 Section 5.5.3e:
2492                          * "Note that the preferred lifetime of the
2493                          *  corresponding address is always reset to
2494                          *  the Preferred Lifetime in the received
2495                          *  Prefix Information option, regardless of
2496                          *  whether the valid lifetime is also reset or
2497                          *  ignored."
2498                          *
2499                          * So we should always update prefered_lft here.
2500                          */
2501                         update_lft = 1;
2502                 }
2503
2504                 if (update_lft) {
2505                         ifp->valid_lft = valid_lft;
2506                         ifp->prefered_lft = prefered_lft;
2507                         ifp->tstamp = now;
2508                         flags = ifp->flags;
2509                         ifp->flags &= ~IFA_F_DEPRECATED;
2510                         spin_unlock_bh(&ifp->lock);
2511
2512                         if (!(flags&IFA_F_TENTATIVE))
2513                                 ipv6_ifa_notify(0, ifp);
2514                 } else
2515                         spin_unlock_bh(&ifp->lock);
2516
2517                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2518                                  create, now);
2519
2520                 in6_ifa_put(ifp);
2521                 addrconf_verify();
2522         }
2523
2524         return 0;
2525 }
2526 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2527
2528 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2529 {
2530         struct prefix_info *pinfo;
2531         __u32 valid_lft;
2532         __u32 prefered_lft;
2533         int addr_type, err;
2534         u32 addr_flags = 0;
2535         struct inet6_dev *in6_dev;
2536         struct net *net = dev_net(dev);
2537
2538         pinfo = (struct prefix_info *) opt;
2539
2540         if (len < sizeof(struct prefix_info)) {
2541                 ADBG("addrconf: prefix option too short\n");
2542                 return;
2543         }
2544
2545         /*
2546          *      Validation checks ([ADDRCONF], page 19)
2547          */
2548
2549         addr_type = ipv6_addr_type(&pinfo->prefix);
2550
2551         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2552                 return;
2553
2554         valid_lft = ntohl(pinfo->valid);
2555         prefered_lft = ntohl(pinfo->prefered);
2556
2557         if (prefered_lft > valid_lft) {
2558                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2559                 return;
2560         }
2561
2562         in6_dev = in6_dev_get(dev);
2563
2564         if (!in6_dev) {
2565                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2566                                     dev->name);
2567                 return;
2568         }
2569
2570         /*
2571          *      Two things going on here:
2572          *      1) Add routes for on-link prefixes
2573          *      2) Configure prefixes with the auto flag set
2574          */
2575
2576         if (pinfo->onlink) {
2577                 struct rt6_info *rt;
2578                 unsigned long rt_expires;
2579
2580                 /* Avoid arithmetic overflow. Really, we could
2581                  * save rt_expires in seconds, likely valid_lft,
2582                  * but it would require division in fib gc, that it
2583                  * not good.
2584                  */
2585                 if (HZ > USER_HZ)
2586                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2587                 else
2588                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2589
2590                 if (addrconf_finite_timeout(rt_expires))
2591                         rt_expires *= HZ;
2592
2593                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2594                                                pinfo->prefix_len,
2595                                                dev,
2596                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2597                                                RTF_GATEWAY | RTF_DEFAULT);
2598
2599                 if (rt) {
2600                         /* Autoconf prefix route */
2601                         if (valid_lft == 0) {
2602                                 ip6_del_rt(rt);
2603                                 rt = NULL;
2604                         } else if (addrconf_finite_timeout(rt_expires)) {
2605                                 /* not infinity */
2606                                 rt6_set_expires(rt, jiffies + rt_expires);
2607                         } else {
2608                                 rt6_clean_expires(rt);
2609                         }
2610                 } else if (valid_lft) {
2611                         clock_t expires = 0;
2612                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2613                         if (addrconf_finite_timeout(rt_expires)) {
2614                                 /* not infinity */
2615                                 flags |= RTF_EXPIRES;
2616                                 expires = jiffies_to_clock_t(rt_expires);
2617                         }
2618                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2619                                               dev, expires, flags);
2620                 }
2621                 ip6_rt_put(rt);
2622         }
2623
2624         /* Try to figure out our local address for this prefix */
2625
2626         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2627                 struct in6_addr addr;
2628                 bool tokenized = false, dev_addr_generated = false;
2629
2630                 if (pinfo->prefix_len == 64) {
2631                         memcpy(&addr, &pinfo->prefix, 8);
2632
2633                         if (!ipv6_addr_any(&in6_dev->token)) {
2634                                 read_lock_bh(&in6_dev->lock);
2635                                 memcpy(addr.s6_addr + 8,
2636                                        in6_dev->token.s6_addr + 8, 8);
2637                                 read_unlock_bh(&in6_dev->lock);
2638                                 tokenized = true;
2639                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2640                                    !ipv6_generate_stable_address(&addr, 0,
2641                                                                  in6_dev)) {
2642                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2643                                 goto ok;
2644                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2645                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2646                                 goto put;
2647                         } else {
2648                                 dev_addr_generated = true;
2649                         }
2650                         goto ok;
2651                 }
2652                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2653                                     pinfo->prefix_len);
2654                 goto put;
2655
2656 ok:
2657                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2658                                                    &addr, addr_type,
2659                                                    addr_flags, sllao,
2660                                                    tokenized, valid_lft,
2661                                                    prefered_lft);
2662                 if (err)
2663                         goto put;
2664
2665                 /* Ignore error case here because previous prefix add addr was
2666                  * successful which will be notified.
2667                  */
2668                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2669                                               addr_type, addr_flags, sllao,
2670                                               tokenized, valid_lft,
2671                                               prefered_lft,
2672                                               dev_addr_generated);
2673         }
2674         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2675 put:
2676         in6_dev_put(in6_dev);
2677 }
2678
2679 /*
2680  *      Set destination address.
2681  *      Special case for SIT interfaces where we create a new "virtual"
2682  *      device.
2683  */
2684 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2685 {
2686         struct in6_ifreq ireq;
2687         struct net_device *dev;
2688         int err = -EINVAL;
2689
2690         rtnl_lock();
2691
2692         err = -EFAULT;
2693         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2694                 goto err_exit;
2695
2696         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2697
2698         err = -ENODEV;
2699         if (!dev)
2700                 goto err_exit;
2701
2702 #if IS_ENABLED(CONFIG_IPV6_SIT)
2703         if (dev->type == ARPHRD_SIT) {
2704                 const struct net_device_ops *ops = dev->netdev_ops;
2705                 struct ifreq ifr;
2706                 struct ip_tunnel_parm p;
2707
2708                 err = -EADDRNOTAVAIL;
2709                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2710                         goto err_exit;
2711
2712                 memset(&p, 0, sizeof(p));
2713                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2714                 p.iph.saddr = 0;
2715                 p.iph.version = 4;
2716                 p.iph.ihl = 5;
2717                 p.iph.protocol = IPPROTO_IPV6;
2718                 p.iph.ttl = 64;
2719                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2720
2721                 if (ops->ndo_do_ioctl) {
2722                         mm_segment_t oldfs = get_fs();
2723
2724                         set_fs(KERNEL_DS);
2725                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2726                         set_fs(oldfs);
2727                 } else
2728                         err = -EOPNOTSUPP;
2729
2730                 if (err == 0) {
2731                         err = -ENOBUFS;
2732                         dev = __dev_get_by_name(net, p.name);
2733                         if (!dev)
2734                                 goto err_exit;
2735                         err = dev_open(dev);
2736                 }
2737         }
2738 #endif
2739
2740 err_exit:
2741         rtnl_unlock();
2742         return err;
2743 }
2744
2745 static int ipv6_mc_config(struct sock *sk, bool join,
2746                           const struct in6_addr *addr, int ifindex)
2747 {
2748         int ret;
2749
2750         ASSERT_RTNL();
2751
2752         lock_sock(sk);
2753         if (join)
2754                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2755         else
2756                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2757         release_sock(sk);
2758
2759         return ret;
2760 }
2761
2762 /*
2763  *      Manual configuration of address on an interface
2764  */
2765 static int inet6_addr_add(struct net *net, int ifindex,
2766                           const struct in6_addr *pfx,
2767                           const struct in6_addr *peer_pfx,
2768                           unsigned int plen, __u32 ifa_flags,
2769                           __u32 prefered_lft, __u32 valid_lft)
2770 {
2771         struct inet6_ifaddr *ifp;
2772         struct inet6_dev *idev;
2773         struct net_device *dev;
2774         unsigned long timeout;
2775         clock_t expires;
2776         int scope;
2777         u32 flags;
2778
2779         ASSERT_RTNL();
2780
2781         if (plen > 128)
2782                 return -EINVAL;
2783
2784         /* check the lifetime */
2785         if (!valid_lft || prefered_lft > valid_lft)
2786                 return -EINVAL;
2787
2788         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2789                 return -EINVAL;
2790
2791         dev = __dev_get_by_index(net, ifindex);
2792         if (!dev)
2793                 return -ENODEV;
2794
2795         idev = addrconf_add_dev(dev);
2796         if (IS_ERR(idev))
2797                 return PTR_ERR(idev);
2798
2799         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2800                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2801                                          true, pfx, ifindex);
2802
2803                 if (ret < 0)
2804                         return ret;
2805         }
2806
2807         scope = ipv6_addr_scope(pfx);
2808
2809         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2810         if (addrconf_finite_timeout(timeout)) {
2811                 expires = jiffies_to_clock_t(timeout * HZ);
2812                 valid_lft = timeout;
2813                 flags = RTF_EXPIRES;
2814         } else {
2815                 expires = 0;
2816                 flags = 0;
2817                 ifa_flags |= IFA_F_PERMANENT;
2818         }
2819
2820         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2821         if (addrconf_finite_timeout(timeout)) {
2822                 if (timeout == 0)
2823                         ifa_flags |= IFA_F_DEPRECATED;
2824                 prefered_lft = timeout;
2825         }
2826
2827         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2828                             valid_lft, prefered_lft);
2829
2830         if (!IS_ERR(ifp)) {
2831                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2832                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2833                                               expires, flags);
2834                 }
2835
2836                 /*
2837                  * Note that section 3.1 of RFC 4429 indicates
2838                  * that the Optimistic flag should not be set for
2839                  * manually configured addresses
2840                  */
2841                 addrconf_dad_start(ifp);
2842                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2843                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2844                                          true, jiffies);
2845                 in6_ifa_put(ifp);
2846                 addrconf_verify_rtnl();
2847                 return 0;
2848         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2849                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2850                                false, pfx, ifindex);
2851         }
2852
2853         return PTR_ERR(ifp);
2854 }
2855
2856 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2857                           const struct in6_addr *pfx, unsigned int plen)
2858 {
2859         struct inet6_ifaddr *ifp;
2860         struct inet6_dev *idev;
2861         struct net_device *dev;
2862
2863         if (plen > 128)
2864                 return -EINVAL;
2865
2866         dev = __dev_get_by_index(net, ifindex);
2867         if (!dev)
2868                 return -ENODEV;
2869
2870         idev = __in6_dev_get(dev);
2871         if (!idev)
2872                 return -ENXIO;
2873
2874         read_lock_bh(&idev->lock);
2875         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2876                 if (ifp->prefix_len == plen &&
2877                     ipv6_addr_equal(pfx, &ifp->addr)) {
2878                         in6_ifa_hold(ifp);
2879                         read_unlock_bh(&idev->lock);
2880
2881                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2882                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2883                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2884                                                  jiffies);
2885                         ipv6_del_addr(ifp);
2886                         addrconf_verify_rtnl();
2887                         if (ipv6_addr_is_multicast(pfx)) {
2888                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2889                                                false, pfx, dev->ifindex);
2890                         }
2891                         return 0;
2892                 }
2893         }
2894         read_unlock_bh(&idev->lock);
2895         return -EADDRNOTAVAIL;
2896 }
2897
2898
2899 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2900 {
2901         struct in6_ifreq ireq;
2902         int err;
2903
2904         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2905                 return -EPERM;
2906
2907         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2908                 return -EFAULT;
2909
2910         rtnl_lock();
2911         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2912                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2913                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2914         rtnl_unlock();
2915         return err;
2916 }
2917
2918 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2919 {
2920         struct in6_ifreq ireq;
2921         int err;
2922
2923         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2924                 return -EPERM;
2925
2926         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2927                 return -EFAULT;
2928
2929         rtnl_lock();
2930         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2931                              ireq.ifr6_prefixlen);
2932         rtnl_unlock();
2933         return err;
2934 }
2935
2936 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2937                      int plen, int scope)
2938 {
2939         struct inet6_ifaddr *ifp;
2940
2941         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2942                             scope, IFA_F_PERMANENT,
2943                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2944         if (!IS_ERR(ifp)) {
2945                 spin_lock_bh(&ifp->lock);
2946                 ifp->flags &= ~IFA_F_TENTATIVE;
2947                 spin_unlock_bh(&ifp->lock);
2948                 rt_genid_bump_ipv6(dev_net(idev->dev));
2949                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2950                 in6_ifa_put(ifp);
2951         }
2952 }
2953
2954 #if IS_ENABLED(CONFIG_IPV6_SIT)
2955 static void sit_add_v4_addrs(struct inet6_dev *idev)
2956 {
2957         struct in6_addr addr;
2958         struct net_device *dev;
2959         struct net *net = dev_net(idev->dev);
2960         int scope, plen;
2961         u32 pflags = 0;
2962
2963         ASSERT_RTNL();
2964
2965         memset(&addr, 0, sizeof(struct in6_addr));
2966         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2967
2968         if (idev->dev->flags&IFF_POINTOPOINT) {
2969                 addr.s6_addr32[0] = htonl(0xfe800000);
2970                 scope = IFA_LINK;
2971                 plen = 64;
2972         } else {
2973                 scope = IPV6_ADDR_COMPATv4;
2974                 plen = 96;
2975                 pflags |= RTF_NONEXTHOP;
2976         }
2977
2978         if (addr.s6_addr32[3]) {
2979                 add_addr(idev, &addr, plen, scope);
2980                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2981                 return;
2982         }
2983
2984         for_each_netdev(net, dev) {
2985                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2986                 if (in_dev && (dev->flags & IFF_UP)) {
2987                         struct in_ifaddr *ifa;
2988
2989                         int flag = scope;
2990
2991                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2992
2993                                 addr.s6_addr32[3] = ifa->ifa_local;
2994
2995                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2996                                         continue;
2997                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2998                                         if (idev->dev->flags&IFF_POINTOPOINT)
2999                                                 continue;
3000                                         flag |= IFA_HOST;
3001                                 }
3002
3003                                 add_addr(idev, &addr, plen, flag);
3004                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3005                                                       pflags);
3006                         }
3007                 }
3008         }
3009 }
3010 #endif
3011
3012 static void init_loopback(struct net_device *dev)
3013 {
3014         struct inet6_dev  *idev;
3015         struct net_device *sp_dev;
3016         struct inet6_ifaddr *sp_ifa;
3017         struct rt6_info *sp_rt;
3018
3019         /* ::1 */
3020
3021         ASSERT_RTNL();
3022
3023         idev = ipv6_find_idev(dev);
3024         if (!idev) {
3025                 pr_debug("%s: add_dev failed\n", __func__);
3026                 return;
3027         }
3028
3029         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3030
3031         /* Add routes to other interface's IPv6 addresses */
3032         for_each_netdev(dev_net(dev), sp_dev) {
3033                 if (!strcmp(sp_dev->name, dev->name))
3034                         continue;
3035
3036                 idev = __in6_dev_get(sp_dev);
3037                 if (!idev)
3038                         continue;
3039
3040                 read_lock_bh(&idev->lock);
3041                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3042
3043                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3044                                 continue;
3045
3046                         if (sp_ifa->rt) {
3047                                 /* This dst has been added to garbage list when
3048                                  * lo device down, release this obsolete dst and
3049                                  * reallocate a new router for ifa.
3050                                  */
3051                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3052                                         ip6_rt_put(sp_ifa->rt);
3053                                         sp_ifa->rt = NULL;
3054                                 } else {
3055                                         continue;
3056                                 }
3057                         }
3058
3059                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3060
3061                         /* Failure cases are ignored */
3062                         if (!IS_ERR(sp_rt)) {
3063                                 sp_ifa->rt = sp_rt;
3064                                 ip6_ins_rt(sp_rt);
3065                         }
3066                 }
3067                 read_unlock_bh(&idev->lock);
3068         }
3069 }
3070
3071 void addrconf_add_linklocal(struct inet6_dev *idev,
3072                             const struct in6_addr *addr, u32 flags)
3073 {
3074         struct inet6_ifaddr *ifp;
3075         u32 addr_flags = flags | IFA_F_PERMANENT;
3076
3077 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3078         if (idev->cnf.optimistic_dad &&
3079             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3080                 addr_flags |= IFA_F_OPTIMISTIC;
3081 #endif
3082
3083         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3084                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3085         if (!IS_ERR(ifp)) {
3086                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3087                 addrconf_dad_start(ifp);
3088                 in6_ifa_put(ifp);
3089         }
3090 }
3091 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3092
3093 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3094 {
3095         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3096                 return true;
3097
3098         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3099             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3100                 return true;
3101
3102         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3103             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3104                 return true;
3105
3106         return false;
3107 }
3108
3109 static int ipv6_generate_stable_address(struct in6_addr *address,
3110                                         u8 dad_count,
3111                                         const struct inet6_dev *idev)
3112 {
3113         static DEFINE_SPINLOCK(lock);
3114         static __u32 digest[SHA_DIGEST_WORDS];
3115         static __u32 workspace[SHA_WORKSPACE_WORDS];
3116
3117         static union {
3118                 char __data[SHA_MESSAGE_BYTES];
3119                 struct {
3120                         struct in6_addr secret;
3121                         __be32 prefix[2];
3122                         unsigned char hwaddr[MAX_ADDR_LEN];
3123                         u8 dad_count;
3124                 } __packed;
3125         } data;
3126
3127         struct in6_addr secret;
3128         struct in6_addr temp;
3129         struct net *net = dev_net(idev->dev);
3130
3131         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3132
3133         if (idev->cnf.stable_secret.initialized)
3134                 secret = idev->cnf.stable_secret.secret;
3135         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3136                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3137         else
3138                 return -1;
3139
3140 retry:
3141         spin_lock_bh(&lock);
3142
3143         sha_init(digest);
3144         memset(&data, 0, sizeof(data));
3145         memset(workspace, 0, sizeof(workspace));
3146         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3147         data.prefix[0] = address->s6_addr32[0];
3148         data.prefix[1] = address->s6_addr32[1];
3149         data.secret = secret;
3150         data.dad_count = dad_count;
3151
3152         sha_transform(digest, data.__data, workspace);
3153
3154         temp = *address;
3155         temp.s6_addr32[2] = (__force __be32)digest[0];
3156         temp.s6_addr32[3] = (__force __be32)digest[1];
3157
3158         spin_unlock_bh(&lock);
3159
3160         if (ipv6_reserved_interfaceid(temp)) {
3161                 dad_count++;
3162                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3163                         return -1;
3164                 goto retry;
3165         }
3166
3167         *address = temp;
3168         return 0;
3169 }
3170
3171 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3172 {
3173         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3174
3175         if (s->initialized)
3176                 return;
3177         s = &idev->cnf.stable_secret;
3178         get_random_bytes(&s->secret, sizeof(s->secret));
3179         s->initialized = true;
3180 }
3181
3182 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3183 {
3184         struct in6_addr addr;
3185
3186         /* no link local addresses on L3 master devices */
3187         if (netif_is_l3_master(idev->dev))
3188                 return;
3189
3190         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3191
3192         switch (idev->cnf.addr_gen_mode) {
3193         case IN6_ADDR_GEN_MODE_RANDOM:
3194                 ipv6_gen_mode_random_init(idev);
3195                 /* fallthrough */
3196         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3197                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3198                         addrconf_add_linklocal(idev, &addr,
3199                                                IFA_F_STABLE_PRIVACY);
3200                 else if (prefix_route)
3201                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3202                 break;
3203         case IN6_ADDR_GEN_MODE_EUI64:
3204                 /* addrconf_add_linklocal also adds a prefix_route and we
3205                  * only need to care about prefix routes if ipv6_generate_eui64
3206                  * couldn't generate one.
3207                  */
3208                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3209                         addrconf_add_linklocal(idev, &addr, 0);
3210                 else if (prefix_route)
3211                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3212                 break;
3213         case IN6_ADDR_GEN_MODE_NONE:
3214         default:
3215                 /* will not add any link local address */
3216                 break;
3217         }
3218 }
3219
3220 static void addrconf_dev_config(struct net_device *dev)
3221 {
3222         struct inet6_dev *idev;
3223
3224         ASSERT_RTNL();
3225
3226         if ((dev->type != ARPHRD_ETHER) &&
3227             (dev->type != ARPHRD_FDDI) &&
3228             (dev->type != ARPHRD_ARCNET) &&
3229             (dev->type != ARPHRD_INFINIBAND) &&
3230             (dev->type != ARPHRD_IEEE1394) &&
3231             (dev->type != ARPHRD_TUNNEL6) &&
3232             (dev->type != ARPHRD_6LOWPAN) &&
3233             (dev->type != ARPHRD_IP6GRE) &&
3234             (dev->type != ARPHRD_IPGRE) &&
3235             (dev->type != ARPHRD_TUNNEL) &&
3236             (dev->type != ARPHRD_NONE)) {
3237                 /* Alas, we support only Ethernet autoconfiguration. */
3238                 return;
3239         }
3240
3241         idev = addrconf_add_dev(dev);
3242         if (IS_ERR(idev))
3243                 return;
3244
3245         /* this device type has no EUI support */
3246         if (dev->type == ARPHRD_NONE &&
3247             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3248                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3249
3250         addrconf_addr_gen(idev, false);
3251 }
3252
3253 #if IS_ENABLED(CONFIG_IPV6_SIT)
3254 static void addrconf_sit_config(struct net_device *dev)
3255 {
3256         struct inet6_dev *idev;
3257
3258         ASSERT_RTNL();
3259
3260         /*
3261          * Configure the tunnel with one of our IPv4
3262          * addresses... we should configure all of
3263          * our v4 addrs in the tunnel
3264          */
3265
3266         idev = ipv6_find_idev(dev);
3267         if (!idev) {
3268                 pr_debug("%s: add_dev failed\n", __func__);
3269                 return;
3270         }
3271
3272         if (dev->priv_flags & IFF_ISATAP) {
3273                 addrconf_addr_gen(idev, false);
3274                 return;
3275         }
3276
3277         sit_add_v4_addrs(idev);
3278
3279         if (dev->flags&IFF_POINTOPOINT)
3280                 addrconf_add_mroute(dev);
3281 }
3282 #endif
3283
3284 #if IS_ENABLED(CONFIG_NET_IPGRE)
3285 static void addrconf_gre_config(struct net_device *dev)
3286 {
3287         struct inet6_dev *idev;
3288
3289         ASSERT_RTNL();
3290
3291         idev = ipv6_find_idev(dev);
3292         if (!idev) {
3293                 pr_debug("%s: add_dev failed\n", __func__);
3294                 return;
3295         }
3296
3297         addrconf_addr_gen(idev, true);
3298         if (dev->flags & IFF_POINTOPOINT)
3299                 addrconf_add_mroute(dev);
3300 }
3301 #endif
3302
3303 static int fixup_permanent_addr(struct inet6_dev *idev,
3304                                 struct inet6_ifaddr *ifp)
3305 {
3306         /* rt6i_ref == 0 means the host route was removed from the
3307          * FIB, for example, if 'lo' device is taken down. In that
3308          * case regenerate the host route.
3309          */
3310         if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) {
3311                 struct rt6_info *rt, *prev;
3312
3313                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3314                 if (unlikely(IS_ERR(rt)))
3315                         return PTR_ERR(rt);
3316
3317                 /* ifp->rt can be accessed outside of rtnl */
3318                 spin_lock(&ifp->lock);
3319                 prev = ifp->rt;
3320                 ifp->rt = rt;
3321                 spin_unlock(&ifp->lock);
3322
3323                 ip6_rt_put(prev);
3324         }
3325
3326         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3327                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3328                                       idev->dev, 0, 0);
3329         }
3330
3331         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3332                 addrconf_dad_start(ifp);
3333
3334         return 0;
3335 }
3336
3337 static void addrconf_permanent_addr(struct net_device *dev)
3338 {
3339         struct inet6_ifaddr *ifp, *tmp;
3340         struct inet6_dev *idev;
3341
3342         idev = __in6_dev_get(dev);
3343         if (!idev)
3344                 return;
3345
3346         write_lock_bh(&idev->lock);
3347
3348         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3349                 if ((ifp->flags & IFA_F_PERMANENT) &&
3350                     fixup_permanent_addr(idev, ifp) < 0) {
3351                         write_unlock_bh(&idev->lock);
3352                         ipv6_del_addr(ifp);
3353                         write_lock_bh(&idev->lock);
3354
3355                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3356                                              idev->dev->name, &ifp->addr);
3357                 }
3358         }
3359
3360         write_unlock_bh(&idev->lock);
3361 }
3362
3363 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3364                            void *ptr)
3365 {
3366         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3367         struct netdev_notifier_changeupper_info *info;
3368         struct inet6_dev *idev = __in6_dev_get(dev);
3369         int run_pending = 0;
3370         int err;
3371
3372         switch (event) {
3373         case NETDEV_REGISTER:
3374                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3375                         idev = ipv6_add_dev(dev);
3376                         if (IS_ERR(idev))
3377                                 return notifier_from_errno(PTR_ERR(idev));
3378                 }
3379                 break;
3380
3381         case NETDEV_CHANGEMTU:
3382                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3383                 if (dev->mtu < IPV6_MIN_MTU) {
3384                         addrconf_ifdown(dev, 1);
3385                         break;
3386                 }
3387
3388                 if (idev) {
3389                         rt6_mtu_change(dev, dev->mtu);
3390                         idev->cnf.mtu6 = dev->mtu;
3391                         break;
3392                 }
3393
3394                 /* allocate new idev */
3395                 idev = ipv6_add_dev(dev);
3396                 if (IS_ERR(idev))
3397                         break;
3398
3399                 /* device is still not ready */
3400                 if (!(idev->if_flags & IF_READY))
3401                         break;
3402
3403                 run_pending = 1;
3404
3405                 /* fall through */
3406
3407         case NETDEV_UP:
3408         case NETDEV_CHANGE:
3409                 if (dev->flags & IFF_SLAVE)
3410                         break;
3411
3412                 if (idev && idev->cnf.disable_ipv6)
3413                         break;
3414
3415                 if (event == NETDEV_UP) {
3416                         /* restore routes for permanent addresses */
3417                         addrconf_permanent_addr(dev);
3418
3419                         if (!addrconf_qdisc_ok(dev)) {
3420                                 /* device is not ready yet. */
3421                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3422                                         dev->name);
3423                                 break;
3424                         }
3425
3426                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3427                                 idev = ipv6_add_dev(dev);
3428
3429                         if (!IS_ERR_OR_NULL(idev)) {
3430                                 idev->if_flags |= IF_READY;
3431                                 run_pending = 1;
3432                         }
3433                 } else if (event == NETDEV_CHANGE) {
3434                         if (!addrconf_qdisc_ok(dev)) {
3435                                 /* device is still not ready. */
3436                                 break;
3437                         }
3438
3439                         if (idev) {
3440                                 if (idev->if_flags & IF_READY) {
3441                                         /* device is already configured -
3442                                          * but resend MLD reports, we might
3443                                          * have roamed and need to update
3444                                          * multicast snooping switches
3445                                          */
3446                                         ipv6_mc_up(idev);
3447                                         break;
3448                                 }
3449                                 idev->if_flags |= IF_READY;
3450                         }
3451
3452                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3453                                 dev->name);
3454
3455                         run_pending = 1;
3456                 }
3457
3458                 switch (dev->type) {
3459 #if IS_ENABLED(CONFIG_IPV6_SIT)
3460                 case ARPHRD_SIT:
3461                         addrconf_sit_config(dev);
3462                         break;
3463 #endif
3464 #if IS_ENABLED(CONFIG_NET_IPGRE)
3465                 case ARPHRD_IPGRE:
3466                         addrconf_gre_config(dev);
3467                         break;
3468 #endif
3469                 case ARPHRD_LOOPBACK:
3470                         init_loopback(dev);
3471                         break;
3472
3473                 default:
3474                         addrconf_dev_config(dev);
3475                         break;
3476                 }
3477
3478                 if (!IS_ERR_OR_NULL(idev)) {
3479                         if (run_pending)
3480                                 addrconf_dad_run(idev);
3481
3482                         /*
3483                          * If the MTU changed during the interface down,
3484                          * when the interface up, the changed MTU must be
3485                          * reflected in the idev as well as routers.
3486                          */
3487                         if (idev->cnf.mtu6 != dev->mtu &&
3488                             dev->mtu >= IPV6_MIN_MTU) {
3489                                 rt6_mtu_change(dev, dev->mtu);
3490                                 idev->cnf.mtu6 = dev->mtu;
3491                         }
3492                         idev->tstamp = jiffies;
3493                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3494
3495                         /*
3496                          * If the changed mtu during down is lower than
3497                          * IPV6_MIN_MTU stop IPv6 on this interface.
3498                          */
3499                         if (dev->mtu < IPV6_MIN_MTU)
3500                                 addrconf_ifdown(dev, 1);
3501                 }
3502                 break;
3503
3504         case NETDEV_DOWN:
3505         case NETDEV_UNREGISTER:
3506                 /*
3507                  *      Remove all addresses from this interface.
3508                  */
3509                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3510                 break;
3511
3512         case NETDEV_CHANGENAME:
3513                 if (idev) {
3514                         snmp6_unregister_dev(idev);
3515                         addrconf_sysctl_unregister(idev);
3516                         err = addrconf_sysctl_register(idev);
3517                         if (err)
3518                                 return notifier_from_errno(err);
3519                         err = snmp6_register_dev(idev);
3520                         if (err) {
3521                                 addrconf_sysctl_unregister(idev);
3522                                 return notifier_from_errno(err);
3523                         }
3524                 }
3525                 break;
3526
3527         case NETDEV_PRE_TYPE_CHANGE:
3528         case NETDEV_POST_TYPE_CHANGE:
3529                 if (idev)
3530                         addrconf_type_change(dev, event);
3531                 break;
3532
3533         case NETDEV_CHANGEUPPER:
3534                 info = ptr;
3535
3536                 /* flush all routes if dev is linked to or unlinked from
3537                  * an L3 master device (e.g., VRF)
3538                  */
3539                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3540                         addrconf_ifdown(dev, 0);
3541         }
3542
3543         return NOTIFY_OK;
3544 }
3545
3546 /*
3547  *      addrconf module should be notified of a device going up
3548  */
3549 static struct notifier_block ipv6_dev_notf = {
3550         .notifier_call = addrconf_notify,
3551         .priority = ADDRCONF_NOTIFY_PRIORITY,
3552 };
3553
3554 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3555 {
3556         struct inet6_dev *idev;
3557         ASSERT_RTNL();
3558
3559         idev = __in6_dev_get(dev);
3560
3561         if (event == NETDEV_POST_TYPE_CHANGE)
3562                 ipv6_mc_remap(idev);
3563         else if (event == NETDEV_PRE_TYPE_CHANGE)
3564                 ipv6_mc_unmap(idev);
3565 }
3566
3567 static bool addr_is_local(const struct in6_addr *addr)
3568 {
3569         return ipv6_addr_type(addr) &
3570                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3571 }
3572
3573 static int addrconf_ifdown(struct net_device *dev, int how)
3574 {
3575         struct net *net = dev_net(dev);
3576         struct inet6_dev *idev;
3577         struct inet6_ifaddr *ifa, *tmp;
3578         struct list_head del_list;
3579         int _keep_addr;
3580         bool keep_addr;
3581         int state, i;
3582
3583         ASSERT_RTNL();
3584
3585         rt6_ifdown(net, dev);
3586         neigh_ifdown(&nd_tbl, dev);
3587
3588         idev = __in6_dev_get(dev);
3589         if (!idev)
3590                 return -ENODEV;
3591
3592         /*
3593          * Step 1: remove reference to ipv6 device from parent device.
3594          *         Do not dev_put!
3595          */
3596         if (how) {
3597                 idev->dead = 1;
3598
3599                 /* protected by rtnl_lock */
3600                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3601
3602                 /* Step 1.5: remove snmp6 entry */
3603                 snmp6_unregister_dev(idev);
3604
3605         }
3606
3607         /* aggregate the system setting and interface setting */
3608         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3609         if (!_keep_addr)
3610                 _keep_addr = idev->cnf.keep_addr_on_down;
3611
3612         /* combine the user config with event to determine if permanent
3613          * addresses are to be removed from address hash table
3614          */
3615         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3616
3617         /* Step 2: clear hash table */
3618         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3619                 struct hlist_head *h = &inet6_addr_lst[i];
3620
3621                 spin_lock_bh(&addrconf_hash_lock);
3622 restart:
3623                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3624                         if (ifa->idev == idev) {
3625                                 addrconf_del_dad_work(ifa);
3626                                 /* combined flag + permanent flag decide if
3627                                  * address is retained on a down event
3628                                  */
3629                                 if (!keep_addr ||
3630                                     !(ifa->flags & IFA_F_PERMANENT) ||
3631                                     addr_is_local(&ifa->addr)) {
3632                                         hlist_del_init_rcu(&ifa->addr_lst);
3633                                         goto restart;
3634                                 }
3635                         }
3636                 }
3637                 spin_unlock_bh(&addrconf_hash_lock);
3638         }
3639
3640         write_lock_bh(&idev->lock);
3641
3642         addrconf_del_rs_timer(idev);
3643
3644         /* Step 2: clear flags for stateless addrconf */
3645         if (!how)
3646                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3647
3648         /* Step 3: clear tempaddr list */
3649         while (!list_empty(&idev->tempaddr_list)) {
3650                 ifa = list_first_entry(&idev->tempaddr_list,
3651                                        struct inet6_ifaddr, tmp_list);
3652                 list_del(&ifa->tmp_list);
3653                 write_unlock_bh(&idev->lock);
3654                 spin_lock_bh(&ifa->lock);
3655
3656                 if (ifa->ifpub) {
3657                         in6_ifa_put(ifa->ifpub);
3658                         ifa->ifpub = NULL;
3659                 }
3660                 spin_unlock_bh(&ifa->lock);
3661                 in6_ifa_put(ifa);
3662                 write_lock_bh(&idev->lock);
3663         }
3664
3665         /* re-combine the user config with event to determine if permanent
3666          * addresses are to be removed from the interface list
3667          */
3668         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3669
3670         INIT_LIST_HEAD(&del_list);
3671         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3672                 struct rt6_info *rt = NULL;
3673                 bool keep;
3674
3675                 addrconf_del_dad_work(ifa);
3676
3677                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3678                         !addr_is_local(&ifa->addr);
3679                 if (!keep)
3680                         list_move(&ifa->if_list, &del_list);
3681
3682                 write_unlock_bh(&idev->lock);
3683                 spin_lock_bh(&ifa->lock);
3684
3685                 if (keep) {
3686                         /* set state to skip the notifier below */
3687                         state = INET6_IFADDR_STATE_DEAD;
3688                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3689                         if (!(ifa->flags & IFA_F_NODAD))
3690                                 ifa->flags |= IFA_F_TENTATIVE;
3691
3692                         rt = ifa->rt;
3693                         ifa->rt = NULL;
3694                 } else {
3695                         state = ifa->state;
3696                         ifa->state = INET6_IFADDR_STATE_DEAD;
3697                 }
3698
3699                 spin_unlock_bh(&ifa->lock);
3700
3701                 if (rt)
3702                         ip6_del_rt(rt);
3703
3704                 if (state != INET6_IFADDR_STATE_DEAD) {
3705                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3706                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3707                 } else {
3708                         if (idev->cnf.forwarding)
3709                                 addrconf_leave_anycast(ifa);
3710                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3711                 }
3712
3713                 write_lock_bh(&idev->lock);
3714         }
3715
3716         write_unlock_bh(&idev->lock);
3717
3718         /* now clean up addresses to be removed */
3719         while (!list_empty(&del_list)) {
3720                 ifa = list_first_entry(&del_list,
3721                                        struct inet6_ifaddr, if_list);
3722                 list_del(&ifa->if_list);
3723
3724                 in6_ifa_put(ifa);
3725         }
3726
3727         /* Step 5: Discard anycast and multicast list */
3728         if (how) {
3729                 ipv6_ac_destroy_dev(idev);
3730                 ipv6_mc_destroy_dev(idev);
3731         } else {
3732                 ipv6_mc_down(idev);
3733         }
3734
3735         idev->tstamp = jiffies;
3736
3737         /* Last: Shot the device (if unregistered) */
3738         if (how) {
3739                 addrconf_sysctl_unregister(idev);
3740                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3741                 neigh_ifdown(&nd_tbl, dev);
3742                 in6_dev_put(idev);
3743         }
3744         return 0;
3745 }
3746
3747 static void addrconf_rs_timer(unsigned long data)
3748 {
3749         struct inet6_dev *idev = (struct inet6_dev *)data;
3750         struct net_device *dev = idev->dev;
3751         struct in6_addr lladdr;
3752
3753         write_lock(&idev->lock);
3754         if (idev->dead || !(idev->if_flags & IF_READY))
3755                 goto out;
3756
3757         if (!ipv6_accept_ra(idev))
3758                 goto out;
3759
3760         /* Announcement received after solicitation was sent */
3761         if (idev->if_flags & IF_RA_RCVD)
3762                 goto out;
3763
3764         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3765                 write_unlock(&idev->lock);
3766                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3767                         ndisc_send_rs(dev, &lladdr,
3768                                       &in6addr_linklocal_allrouters);
3769                 else
3770                         goto put;
3771
3772                 write_lock(&idev->lock);
3773                 idev->rs_interval = rfc3315_s14_backoff_update(
3774                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3775                 /* The wait after the last probe can be shorter */
3776                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3777                                              idev->cnf.rtr_solicits) ?
3778                                       idev->cnf.rtr_solicit_delay :
3779                                       idev->rs_interval);
3780         } else {
3781                 /*
3782                  * Note: we do not support deprecated "all on-link"
3783                  * assumption any longer.
3784                  */
3785                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3786         }
3787
3788 out:
3789         write_unlock(&idev->lock);
3790 put:
3791         in6_dev_put(idev);
3792 }
3793
3794 /*
3795  *      Duplicate Address Detection
3796  */
3797 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3798 {
3799         unsigned long rand_num;
3800         struct inet6_dev *idev = ifp->idev;
3801         u64 nonce;
3802
3803         if (ifp->flags & IFA_F_OPTIMISTIC)
3804                 rand_num = 0;
3805         else
3806                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3807
3808         nonce = 0;
3809         if (idev->cnf.enhanced_dad ||
3810             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3811                 do
3812                         get_random_bytes(&nonce, 6);
3813                 while (nonce == 0);
3814         }
3815         ifp->dad_nonce = nonce;
3816         ifp->dad_probes = idev->cnf.dad_transmits;
3817         addrconf_mod_dad_work(ifp, rand_num);
3818 }
3819
3820 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3821 {
3822         struct inet6_dev *idev = ifp->idev;
3823         struct net_device *dev = idev->dev;
3824         bool bump_id, notify = false;
3825
3826         addrconf_join_solict(dev, &ifp->addr);
3827
3828         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3829
3830         read_lock_bh(&idev->lock);
3831         spin_lock(&ifp->lock);
3832         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3833                 goto out;
3834
3835         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3836             idev->cnf.accept_dad < 1 ||
3837             !(ifp->flags&IFA_F_TENTATIVE) ||
3838             ifp->flags & IFA_F_NODAD) {
3839                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3840                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3841                 spin_unlock(&ifp->lock);
3842                 read_unlock_bh(&idev->lock);
3843
3844                 addrconf_dad_completed(ifp, bump_id);
3845                 return;
3846         }
3847
3848         if (!(idev->if_flags & IF_READY)) {
3849                 spin_unlock(&ifp->lock);
3850                 read_unlock_bh(&idev->lock);
3851                 /*
3852                  * If the device is not ready:
3853                  * - keep it tentative if it is a permanent address.
3854                  * - otherwise, kill it.
3855                  */
3856                 in6_ifa_hold(ifp);
3857                 addrconf_dad_stop(ifp, 0);
3858                 return;
3859         }
3860
3861         /*
3862          * Optimistic nodes can start receiving
3863          * Frames right away
3864          */
3865         if (ifp->flags & IFA_F_OPTIMISTIC) {
3866                 ip6_ins_rt(ifp->rt);
3867                 if (ipv6_use_optimistic_addr(idev)) {
3868                         /* Because optimistic nodes can use this address,
3869                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3870                          */
3871                         notify = true;
3872                 }
3873         }
3874
3875         addrconf_dad_kick(ifp);
3876 out:
3877         spin_unlock(&ifp->lock);
3878         read_unlock_bh(&idev->lock);
3879         if (notify)
3880                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3881 }
3882
3883 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3884 {
3885         bool begin_dad = false;
3886
3887         spin_lock_bh(&ifp->lock);
3888         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3889                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3890                 begin_dad = true;
3891         }
3892         spin_unlock_bh(&ifp->lock);
3893
3894         if (begin_dad)
3895                 addrconf_mod_dad_work(ifp, 0);
3896 }
3897
3898 static void addrconf_dad_work(struct work_struct *w)
3899 {
3900         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3901                                                 struct inet6_ifaddr,
3902                                                 dad_work);
3903         struct inet6_dev *idev = ifp->idev;
3904         bool bump_id, disable_ipv6 = false;
3905         struct in6_addr mcaddr;
3906
3907         enum {
3908                 DAD_PROCESS,
3909                 DAD_BEGIN,
3910                 DAD_ABORT,
3911         } action = DAD_PROCESS;
3912
3913         rtnl_lock();
3914
3915         spin_lock_bh(&ifp->lock);
3916         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3917                 action = DAD_BEGIN;
3918                 ifp->state = INET6_IFADDR_STATE_DAD;
3919         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3920                 action = DAD_ABORT;
3921                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3922
3923                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3924                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3925                         struct in6_addr addr;
3926
3927                         addr.s6_addr32[0] = htonl(0xfe800000);
3928                         addr.s6_addr32[1] = 0;
3929
3930                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3931                             ipv6_addr_equal(&ifp->addr, &addr)) {
3932                                 /* DAD failed for link-local based on MAC */
3933                                 idev->cnf.disable_ipv6 = 1;
3934
3935                                 pr_info("%s: IPv6 being disabled!\n",
3936                                         ifp->idev->dev->name);
3937                                 disable_ipv6 = true;
3938                         }
3939                 }
3940         }
3941         spin_unlock_bh(&ifp->lock);
3942
3943         if (action == DAD_BEGIN) {
3944                 addrconf_dad_begin(ifp);
3945                 goto out;
3946         } else if (action == DAD_ABORT) {
3947                 in6_ifa_hold(ifp);
3948                 addrconf_dad_stop(ifp, 1);
3949                 if (disable_ipv6)
3950                         addrconf_ifdown(idev->dev, 0);
3951                 goto out;
3952         }
3953
3954         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3955                 goto out;
3956
3957         write_lock_bh(&idev->lock);
3958         if (idev->dead || !(idev->if_flags & IF_READY)) {
3959                 write_unlock_bh(&idev->lock);
3960                 goto out;
3961         }
3962
3963         spin_lock(&ifp->lock);
3964         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3965                 spin_unlock(&ifp->lock);
3966                 write_unlock_bh(&idev->lock);
3967                 goto out;
3968         }
3969
3970         if (ifp->dad_probes == 0) {
3971                 /*
3972                  * DAD was successful
3973                  */
3974
3975                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3976                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3977                 spin_unlock(&ifp->lock);
3978                 write_unlock_bh(&idev->lock);
3979
3980                 addrconf_dad_completed(ifp, bump_id);
3981
3982                 goto out;
3983         }
3984
3985         ifp->dad_probes--;
3986         addrconf_mod_dad_work(ifp,
3987                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3988         spin_unlock(&ifp->lock);
3989         write_unlock_bh(&idev->lock);
3990
3991         /* send a neighbour solicitation for our addr */
3992         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3993         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3994                       ifp->dad_nonce);
3995 out:
3996         in6_ifa_put(ifp);
3997         rtnl_unlock();
3998 }
3999
4000 /* ifp->idev must be at least read locked */
4001 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4002 {
4003         struct inet6_ifaddr *ifpiter;
4004         struct inet6_dev *idev = ifp->idev;
4005
4006         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4007                 if (ifpiter->scope > IFA_LINK)
4008                         break;
4009                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4010                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4011                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4012                     IFA_F_PERMANENT)
4013                         return false;
4014         }
4015         return true;
4016 }
4017
4018 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
4019 {
4020         struct net_device *dev = ifp->idev->dev;
4021         struct in6_addr lladdr;
4022         bool send_rs, send_mld;
4023
4024         addrconf_del_dad_work(ifp);
4025
4026         /*
4027          *      Configure the address for reception. Now it is valid.
4028          */
4029
4030         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4031
4032         /* If added prefix is link local and we are prepared to process
4033            router advertisements, start sending router solicitations.
4034          */
4035
4036         read_lock_bh(&ifp->idev->lock);
4037         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4038         send_rs = send_mld &&
4039                   ipv6_accept_ra(ifp->idev) &&
4040                   ifp->idev->cnf.rtr_solicits != 0 &&
4041                   (dev->flags&IFF_LOOPBACK) == 0;
4042         read_unlock_bh(&ifp->idev->lock);
4043
4044         /* While dad is in progress mld report's source address is in6_addrany.
4045          * Resend with proper ll now.
4046          */
4047         if (send_mld)
4048                 ipv6_mc_dad_complete(ifp->idev);
4049
4050         if (send_rs) {
4051                 /*
4052                  *      If a host as already performed a random delay
4053                  *      [...] as part of DAD [...] there is no need
4054                  *      to delay again before sending the first RS
4055                  */
4056                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4057                         return;
4058                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4059
4060                 write_lock_bh(&ifp->idev->lock);
4061                 spin_lock(&ifp->lock);
4062                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4063                         ifp->idev->cnf.rtr_solicit_interval);
4064                 ifp->idev->rs_probes = 1;
4065                 ifp->idev->if_flags |= IF_RS_SENT;
4066                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4067                 spin_unlock(&ifp->lock);
4068                 write_unlock_bh(&ifp->idev->lock);
4069         }
4070
4071         if (bump_id)
4072                 rt_genid_bump_ipv6(dev_net(dev));
4073
4074         /* Make sure that a new temporary address will be created
4075          * before this temporary address becomes deprecated.
4076          */
4077         if (ifp->flags & IFA_F_TEMPORARY)
4078                 addrconf_verify_rtnl();
4079 }
4080
4081 static void addrconf_dad_run(struct inet6_dev *idev)
4082 {
4083         struct inet6_ifaddr *ifp;
4084
4085         read_lock_bh(&idev->lock);
4086         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4087                 spin_lock(&ifp->lock);
4088                 if (ifp->flags & IFA_F_TENTATIVE &&
4089                     ifp->state == INET6_IFADDR_STATE_DAD)
4090                         addrconf_dad_kick(ifp);
4091                 spin_unlock(&ifp->lock);
4092         }
4093         read_unlock_bh(&idev->lock);
4094 }
4095
4096 #ifdef CONFIG_PROC_FS
4097 struct if6_iter_state {
4098         struct seq_net_private p;
4099         int bucket;
4100         int offset;
4101 };
4102
4103 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4104 {
4105         struct inet6_ifaddr *ifa = NULL;
4106         struct if6_iter_state *state = seq->private;
4107         struct net *net = seq_file_net(seq);
4108         int p = 0;
4109
4110         /* initial bucket if pos is 0 */
4111         if (pos == 0) {
4112                 state->bucket = 0;
4113                 state->offset = 0;
4114         }
4115
4116         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4117                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4118                                          addr_lst) {
4119                         if (!net_eq(dev_net(ifa->idev->dev), net))
4120                                 continue;
4121                         /* sync with offset */
4122                         if (p < state->offset) {
4123                                 p++;
4124                                 continue;
4125                         }
4126                         state->offset++;
4127                         return ifa;
4128                 }
4129
4130                 /* prepare for next bucket */
4131                 state->offset = 0;
4132                 p = 0;
4133         }
4134         return NULL;
4135 }
4136
4137 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4138                                          struct inet6_ifaddr *ifa)
4139 {
4140         struct if6_iter_state *state = seq->private;
4141         struct net *net = seq_file_net(seq);
4142
4143         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4144                 if (!net_eq(dev_net(ifa->idev->dev), net))
4145                         continue;
4146                 state->offset++;
4147                 return ifa;
4148         }
4149
4150         while (++state->bucket < IN6_ADDR_HSIZE) {
4151                 state->offset = 0;
4152                 hlist_for_each_entry_rcu_bh(ifa,
4153                                      &inet6_addr_lst[state->bucket], addr_lst) {
4154                         if (!net_eq(dev_net(ifa->idev->dev), net))
4155                                 continue;
4156                         state->offset++;
4157                         return ifa;
4158                 }
4159         }
4160
4161         return NULL;
4162 }
4163
4164 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4165         __acquires(rcu_bh)
4166 {
4167         rcu_read_lock_bh();
4168         return if6_get_first(seq, *pos);
4169 }
4170
4171 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4172 {
4173         struct inet6_ifaddr *ifa;
4174
4175         ifa = if6_get_next(seq, v);
4176         ++*pos;
4177         return ifa;
4178 }
4179
4180 static void if6_seq_stop(struct seq_file *seq, void *v)
4181         __releases(rcu_bh)
4182 {
4183         rcu_read_unlock_bh();
4184 }
4185
4186 static int if6_seq_show(struct seq_file *seq, void *v)
4187 {
4188         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4189         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4190                    &ifp->addr,
4191                    ifp->idev->dev->ifindex,
4192                    ifp->prefix_len,
4193                    ifp->scope,
4194                    (u8) ifp->flags,
4195                    ifp->idev->dev->name);
4196         return 0;
4197 }
4198
4199 static const struct seq_operations if6_seq_ops = {
4200         .start  = if6_seq_start,
4201         .next   = if6_seq_next,
4202         .show   = if6_seq_show,
4203         .stop   = if6_seq_stop,
4204 };
4205
4206 static int if6_seq_open(struct inode *inode, struct file *file)
4207 {
4208         return seq_open_net(inode, file, &if6_seq_ops,
4209                             sizeof(struct if6_iter_state));
4210 }
4211
4212 static const struct file_operations if6_fops = {
4213         .owner          = THIS_MODULE,
4214         .open           = if6_seq_open,
4215         .read           = seq_read,
4216         .llseek         = seq_lseek,
4217         .release        = seq_release_net,
4218 };
4219
4220 static int __net_init if6_proc_net_init(struct net *net)
4221 {
4222         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4223                 return -ENOMEM;
4224         return 0;
4225 }
4226
4227 static void __net_exit if6_proc_net_exit(struct net *net)
4228 {
4229         remove_proc_entry("if_inet6", net->proc_net);
4230 }
4231
4232 static struct pernet_operations if6_proc_net_ops = {
4233         .init = if6_proc_net_init,
4234         .exit = if6_proc_net_exit,
4235 };
4236
4237 int __init if6_proc_init(void)
4238 {
4239         return register_pernet_subsys(&if6_proc_net_ops);
4240 }
4241
4242 void if6_proc_exit(void)
4243 {
4244         unregister_pernet_subsys(&if6_proc_net_ops);
4245 }
4246 #endif  /* CONFIG_PROC_FS */
4247
4248 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4249 /* Check if address is a home address configured on any interface. */
4250 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4251 {
4252         int ret = 0;
4253         struct inet6_ifaddr *ifp = NULL;
4254         unsigned int hash = inet6_addr_hash(addr);
4255
4256         rcu_read_lock_bh();
4257         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4258                 if (!net_eq(dev_net(ifp->idev->dev), net))
4259                         continue;
4260                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4261                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4262                         ret = 1;
4263                         break;
4264                 }
4265         }
4266         rcu_read_unlock_bh();
4267         return ret;
4268 }
4269 #endif
4270
4271 /*
4272  *      Periodic address status verification
4273  */
4274
4275 static void addrconf_verify_rtnl(void)
4276 {
4277         unsigned long now, next, next_sec, next_sched;
4278         struct inet6_ifaddr *ifp;
4279         int i;
4280
4281         ASSERT_RTNL();
4282
4283         rcu_read_lock_bh();
4284         now = jiffies;
4285         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4286
4287         cancel_delayed_work(&addr_chk_work);
4288
4289         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4290 restart:
4291                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4292                         unsigned long age;
4293
4294                         /* When setting preferred_lft to a value not zero or
4295                          * infinity, while valid_lft is infinity
4296                          * IFA_F_PERMANENT has a non-infinity life time.
4297                          */
4298                         if ((ifp->flags & IFA_F_PERMANENT) &&
4299                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4300                                 continue;
4301
4302                         spin_lock(&ifp->lock);
4303                         /* We try to batch several events at once. */
4304                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4305
4306                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4307                             age >= ifp->valid_lft) {
4308                                 spin_unlock(&ifp->lock);
4309                                 in6_ifa_hold(ifp);
4310                                 ipv6_del_addr(ifp);
4311                                 goto restart;
4312                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4313                                 spin_unlock(&ifp->lock);
4314                                 continue;
4315                         } else if (age >= ifp->prefered_lft) {
4316                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4317                                 int deprecate = 0;
4318
4319                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4320                                         deprecate = 1;
4321                                         ifp->flags |= IFA_F_DEPRECATED;
4322                                 }
4323
4324                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4325                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4326                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4327
4328                                 spin_unlock(&ifp->lock);
4329
4330                                 if (deprecate) {
4331                                         in6_ifa_hold(ifp);
4332
4333                                         ipv6_ifa_notify(0, ifp);
4334                                         in6_ifa_put(ifp);
4335                                         goto restart;
4336                                 }
4337                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4338                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4339                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4340                                         ifp->idev->cnf.dad_transmits *
4341                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4342
4343                                 if (age >= ifp->prefered_lft - regen_advance) {
4344                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4345                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4346                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4347                                         if (!ifp->regen_count && ifpub) {
4348                                                 ifp->regen_count++;
4349                                                 in6_ifa_hold(ifp);
4350                                                 in6_ifa_hold(ifpub);
4351                                                 spin_unlock(&ifp->lock);
4352
4353                                                 spin_lock(&ifpub->lock);
4354                                                 ifpub->regen_count = 0;
4355                                                 spin_unlock(&ifpub->lock);
4356                                                 ipv6_create_tempaddr(ifpub, ifp);
4357                                                 in6_ifa_put(ifpub);
4358                                                 in6_ifa_put(ifp);
4359                                                 goto restart;
4360                                         }
4361                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4362                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4363                                 spin_unlock(&ifp->lock);
4364                         } else {
4365                                 /* ifp->prefered_lft <= ifp->valid_lft */
4366                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4367                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4368                                 spin_unlock(&ifp->lock);
4369                         }
4370                 }
4371         }
4372
4373         next_sec = round_jiffies_up(next);
4374         next_sched = next;
4375
4376         /* If rounded timeout is accurate enough, accept it. */
4377         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4378                 next_sched = next_sec;
4379
4380         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4381         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4382                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4383
4384         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4385               now, next, next_sec, next_sched);
4386         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4387         rcu_read_unlock_bh();
4388 }
4389
4390 static void addrconf_verify_work(struct work_struct *w)
4391 {
4392         rtnl_lock();
4393         addrconf_verify_rtnl();
4394         rtnl_unlock();
4395 }
4396
4397 static void addrconf_verify(void)
4398 {
4399         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4400 }
4401
4402 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4403                                      struct in6_addr **peer_pfx)
4404 {
4405         struct in6_addr *pfx = NULL;
4406
4407         *peer_pfx = NULL;
4408
4409         if (addr)
4410                 pfx = nla_data(addr);
4411
4412         if (local) {
4413                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4414                         *peer_pfx = pfx;
4415                 pfx = nla_data(local);
4416         }
4417
4418         return pfx;
4419 }
4420
4421 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4422         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4423         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4424         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4425         [IFA_FLAGS]             = { .len = sizeof(u32) },
4426 };
4427
4428 static int
4429 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4430                   struct netlink_ext_ack *extack)
4431 {
4432         struct net *net = sock_net(skb->sk);
4433         struct ifaddrmsg *ifm;
4434         struct nlattr *tb[IFA_MAX+1];
4435         struct in6_addr *pfx, *peer_pfx;
4436         u32 ifa_flags;
4437         int err;
4438
4439         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4440                           extack);
4441         if (err < 0)
4442                 return err;
4443
4444         ifm = nlmsg_data(nlh);
4445         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4446         if (!pfx)
4447                 return -EINVAL;
4448
4449         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4450
4451         /* We ignore other flags so far. */
4452         ifa_flags &= IFA_F_MANAGETEMPADDR;
4453
4454         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4455                               ifm->ifa_prefixlen);
4456 }
4457
4458 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4459                              u32 prefered_lft, u32 valid_lft)
4460 {
4461         u32 flags;
4462         clock_t expires;
4463         unsigned long timeout;
4464         bool was_managetempaddr;
4465         bool had_prefixroute;
4466
4467         ASSERT_RTNL();
4468
4469         if (!valid_lft || (prefered_lft > valid_lft))
4470                 return -EINVAL;
4471
4472         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4473             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4474                 return -EINVAL;
4475
4476         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4477         if (addrconf_finite_timeout(timeout)) {
4478                 expires = jiffies_to_clock_t(timeout * HZ);
4479                 valid_lft = timeout;
4480                 flags = RTF_EXPIRES;
4481         } else {
4482                 expires = 0;
4483                 flags = 0;
4484                 ifa_flags |= IFA_F_PERMANENT;
4485         }
4486
4487         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4488         if (addrconf_finite_timeout(timeout)) {
4489                 if (timeout == 0)
4490                         ifa_flags |= IFA_F_DEPRECATED;
4491                 prefered_lft = timeout;
4492         }
4493
4494         spin_lock_bh(&ifp->lock);
4495         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4496         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4497                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4498         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4499                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4500                         IFA_F_NOPREFIXROUTE);
4501         ifp->flags |= ifa_flags;
4502         ifp->tstamp = jiffies;
4503         ifp->valid_lft = valid_lft;
4504         ifp->prefered_lft = prefered_lft;
4505
4506         spin_unlock_bh(&ifp->lock);
4507         if (!(ifp->flags&IFA_F_TENTATIVE))
4508                 ipv6_ifa_notify(0, ifp);
4509
4510         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4511                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4512                                       expires, flags);
4513         } else if (had_prefixroute) {
4514                 enum cleanup_prefix_rt_t action;
4515                 unsigned long rt_expires;
4516
4517                 write_lock_bh(&ifp->idev->lock);
4518                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4519                 write_unlock_bh(&ifp->idev->lock);
4520
4521                 if (action != CLEANUP_PREFIX_RT_NOP) {
4522                         cleanup_prefix_route(ifp, rt_expires,
4523                                 action == CLEANUP_PREFIX_RT_DEL);
4524                 }
4525         }
4526
4527         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4528                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4529                         valid_lft = prefered_lft = 0;
4530                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4531                                  !was_managetempaddr, jiffies);
4532         }
4533
4534         addrconf_verify_rtnl();
4535
4536         return 0;
4537 }
4538
4539 static int
4540 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4541                   struct netlink_ext_ack *extack)
4542 {
4543         struct net *net = sock_net(skb->sk);
4544         struct ifaddrmsg *ifm;
4545         struct nlattr *tb[IFA_MAX+1];
4546         struct in6_addr *pfx, *peer_pfx;
4547         struct inet6_ifaddr *ifa;
4548         struct net_device *dev;
4549         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4550         u32 ifa_flags;
4551         int err;
4552
4553         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4554                           extack);
4555         if (err < 0)
4556                 return err;
4557
4558         ifm = nlmsg_data(nlh);
4559         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4560         if (!pfx)
4561                 return -EINVAL;
4562
4563         if (tb[IFA_CACHEINFO]) {
4564                 struct ifa_cacheinfo *ci;
4565
4566                 ci = nla_data(tb[IFA_CACHEINFO]);
4567                 valid_lft = ci->ifa_valid;
4568                 preferred_lft = ci->ifa_prefered;
4569         } else {
4570                 preferred_lft = INFINITY_LIFE_TIME;
4571                 valid_lft = INFINITY_LIFE_TIME;
4572         }
4573
4574         dev =  __dev_get_by_index(net, ifm->ifa_index);
4575         if (!dev)
4576                 return -ENODEV;
4577
4578         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4579
4580         /* We ignore other flags so far. */
4581         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4582                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4583
4584         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4585         if (!ifa) {
4586                 /*
4587                  * It would be best to check for !NLM_F_CREATE here but
4588                  * userspace already relies on not having to provide this.
4589                  */
4590                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4591                                       ifm->ifa_prefixlen, ifa_flags,
4592                                       preferred_lft, valid_lft);
4593         }
4594
4595         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4596             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4597                 err = -EEXIST;
4598         else
4599                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4600
4601         in6_ifa_put(ifa);
4602
4603         return err;
4604 }
4605
4606 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4607                           u8 scope, int ifindex)
4608 {
4609         struct ifaddrmsg *ifm;
4610
4611         ifm = nlmsg_data(nlh);
4612         ifm->ifa_family = AF_INET6;
4613         ifm->ifa_prefixlen = prefixlen;
4614         ifm->ifa_flags = flags;
4615         ifm->ifa_scope = scope;
4616         ifm->ifa_index = ifindex;
4617 }
4618
4619 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4620                          unsigned long tstamp, u32 preferred, u32 valid)
4621 {
4622         struct ifa_cacheinfo ci;
4623
4624         ci.cstamp = cstamp_delta(cstamp);
4625         ci.tstamp = cstamp_delta(tstamp);
4626         ci.ifa_prefered = preferred;
4627         ci.ifa_valid = valid;
4628
4629         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4630 }
4631
4632 static inline int rt_scope(int ifa_scope)
4633 {
4634         if (ifa_scope & IFA_HOST)
4635                 return RT_SCOPE_HOST;
4636         else if (ifa_scope & IFA_LINK)
4637                 return RT_SCOPE_LINK;
4638         else if (ifa_scope & IFA_SITE)
4639                 return RT_SCOPE_SITE;
4640         else
4641                 return RT_SCOPE_UNIVERSE;
4642 }
4643
4644 static inline int inet6_ifaddr_msgsize(void)
4645 {
4646         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4647                + nla_total_size(16) /* IFA_LOCAL */
4648                + nla_total_size(16) /* IFA_ADDRESS */
4649                + nla_total_size(sizeof(struct ifa_cacheinfo))
4650                + nla_total_size(4)  /* IFA_FLAGS */;
4651 }
4652
4653 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4654                              u32 portid, u32 seq, int event, unsigned int flags)
4655 {
4656         struct nlmsghdr  *nlh;
4657         u32 preferred, valid;
4658
4659         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4660         if (!nlh)
4661                 return -EMSGSIZE;
4662
4663         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4664                       ifa->idev->dev->ifindex);
4665
4666         if (!((ifa->flags&IFA_F_PERMANENT) &&
4667               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4668                 preferred = ifa->prefered_lft;
4669                 valid = ifa->valid_lft;
4670                 if (preferred != INFINITY_LIFE_TIME) {
4671                         long tval = (jiffies - ifa->tstamp)/HZ;
4672                         if (preferred > tval)
4673                                 preferred -= tval;
4674                         else
4675                                 preferred = 0;
4676                         if (valid != INFINITY_LIFE_TIME) {
4677                                 if (valid > tval)
4678                                         valid -= tval;
4679                                 else
4680                                         valid = 0;
4681                         }
4682                 }
4683         } else {
4684                 preferred = INFINITY_LIFE_TIME;
4685                 valid = INFINITY_LIFE_TIME;
4686         }
4687
4688         if (!ipv6_addr_any(&ifa->peer_addr)) {
4689                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4690                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4691                         goto error;
4692         } else
4693                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4694                         goto error;
4695
4696         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4697                 goto error;
4698
4699         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4700                 goto error;
4701
4702         nlmsg_end(skb, nlh);
4703         return 0;
4704
4705 error:
4706         nlmsg_cancel(skb, nlh);
4707         return -EMSGSIZE;
4708 }
4709
4710 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4711                                 u32 portid, u32 seq, int event, u16 flags)
4712 {
4713         struct nlmsghdr  *nlh;
4714         u8 scope = RT_SCOPE_UNIVERSE;
4715         int ifindex = ifmca->idev->dev->ifindex;
4716
4717         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4718                 scope = RT_SCOPE_SITE;
4719
4720         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4721         if (!nlh)
4722                 return -EMSGSIZE;
4723
4724         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4725         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4726             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4727                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4728                 nlmsg_cancel(skb, nlh);
4729                 return -EMSGSIZE;
4730         }
4731
4732         nlmsg_end(skb, nlh);
4733         return 0;
4734 }
4735
4736 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4737                                 u32 portid, u32 seq, int event, unsigned int flags)
4738 {
4739         struct nlmsghdr  *nlh;
4740         u8 scope = RT_SCOPE_UNIVERSE;
4741         int ifindex = ifaca->aca_idev->dev->ifindex;
4742
4743         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4744                 scope = RT_SCOPE_SITE;
4745
4746         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4747         if (!nlh)
4748                 return -EMSGSIZE;
4749
4750         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4751         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4752             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4753                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4754                 nlmsg_cancel(skb, nlh);
4755                 return -EMSGSIZE;
4756         }
4757
4758         nlmsg_end(skb, nlh);
4759         return 0;
4760 }
4761
4762 enum addr_type_t {
4763         UNICAST_ADDR,
4764         MULTICAST_ADDR,
4765         ANYCAST_ADDR,
4766 };
4767
4768 /* called with rcu_read_lock() */
4769 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4770                           struct netlink_callback *cb, enum addr_type_t type,
4771                           int s_ip_idx, int *p_ip_idx)
4772 {
4773         struct ifmcaddr6 *ifmca;
4774         struct ifacaddr6 *ifaca;
4775         int err = 1;
4776         int ip_idx = *p_ip_idx;
4777
4778         read_lock_bh(&idev->lock);
4779         switch (type) {
4780         case UNICAST_ADDR: {
4781                 struct inet6_ifaddr *ifa;
4782
4783                 /* unicast address incl. temp addr */
4784                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4785                         if (++ip_idx < s_ip_idx)
4786                                 continue;
4787                         err = inet6_fill_ifaddr(skb, ifa,
4788                                                 NETLINK_CB(cb->skb).portid,
4789                                                 cb->nlh->nlmsg_seq,
4790                                                 RTM_NEWADDR,
4791                                                 NLM_F_MULTI);
4792                         if (err < 0)
4793                                 break;
4794                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4795                 }
4796                 break;
4797         }
4798         case MULTICAST_ADDR:
4799                 /* multicast address */
4800                 for (ifmca = idev->mc_list; ifmca;
4801                      ifmca = ifmca->next, ip_idx++) {
4802                         if (ip_idx < s_ip_idx)
4803                                 continue;
4804                         err = inet6_fill_ifmcaddr(skb, ifmca,
4805                                                   NETLINK_CB(cb->skb).portid,
4806                                                   cb->nlh->nlmsg_seq,
4807                                                   RTM_GETMULTICAST,
4808                                                   NLM_F_MULTI);
4809                         if (err < 0)
4810                                 break;
4811                 }
4812                 break;
4813         case ANYCAST_ADDR:
4814                 /* anycast address */
4815                 for (ifaca = idev->ac_list; ifaca;
4816                      ifaca = ifaca->aca_next, ip_idx++) {
4817                         if (ip_idx < s_ip_idx)
4818                                 continue;
4819                         err = inet6_fill_ifacaddr(skb, ifaca,
4820                                                   NETLINK_CB(cb->skb).portid,
4821                                                   cb->nlh->nlmsg_seq,
4822                                                   RTM_GETANYCAST,
4823                                                   NLM_F_MULTI);
4824                         if (err < 0)
4825                                 break;
4826                 }
4827                 break;
4828         default:
4829                 break;
4830         }
4831         read_unlock_bh(&idev->lock);
4832         *p_ip_idx = ip_idx;
4833         return err;
4834 }
4835
4836 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4837                            enum addr_type_t type)
4838 {
4839         struct net *net = sock_net(skb->sk);
4840         int h, s_h;
4841         int idx, ip_idx;
4842         int s_idx, s_ip_idx;
4843         struct net_device *dev;
4844         struct inet6_dev *idev;
4845         struct hlist_head *head;
4846
4847         s_h = cb->args[0];
4848         s_idx = idx = cb->args[1];
4849         s_ip_idx = ip_idx = cb->args[2];
4850
4851         rcu_read_lock();
4852         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4853         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4854                 idx = 0;
4855                 head = &net->dev_index_head[h];
4856                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4857                         if (idx < s_idx)
4858                                 goto cont;
4859                         if (h > s_h || idx > s_idx)
4860                                 s_ip_idx = 0;
4861                         ip_idx = 0;
4862                         idev = __in6_dev_get(dev);
4863                         if (!idev)
4864                                 goto cont;
4865
4866                         if (in6_dump_addrs(idev, skb, cb, type,
4867                                            s_ip_idx, &ip_idx) < 0)
4868                                 goto done;
4869 cont:
4870                         idx++;
4871                 }
4872         }
4873 done:
4874         rcu_read_unlock();
4875         cb->args[0] = h;
4876         cb->args[1] = idx;
4877         cb->args[2] = ip_idx;
4878
4879         return skb->len;
4880 }
4881
4882 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4883 {
4884         enum addr_type_t type = UNICAST_ADDR;
4885
4886         return inet6_dump_addr(skb, cb, type);
4887 }
4888
4889 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4890 {
4891         enum addr_type_t type = MULTICAST_ADDR;
4892
4893         return inet6_dump_addr(skb, cb, type);
4894 }
4895
4896
4897 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4898 {
4899         enum addr_type_t type = ANYCAST_ADDR;
4900
4901         return inet6_dump_addr(skb, cb, type);
4902 }
4903
4904 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4905                              struct netlink_ext_ack *extack)
4906 {
4907         struct net *net = sock_net(in_skb->sk);
4908         struct ifaddrmsg *ifm;
4909         struct nlattr *tb[IFA_MAX+1];
4910         struct in6_addr *addr = NULL, *peer;
4911         struct net_device *dev = NULL;
4912         struct inet6_ifaddr *ifa;
4913         struct sk_buff *skb;
4914         int err;
4915
4916         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4917                           extack);
4918         if (err < 0)
4919                 goto errout;
4920
4921         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4922         if (!addr) {
4923                 err = -EINVAL;
4924                 goto errout;
4925         }
4926
4927         ifm = nlmsg_data(nlh);
4928         if (ifm->ifa_index)
4929                 dev = __dev_get_by_index(net, ifm->ifa_index);
4930
4931         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4932         if (!ifa) {
4933                 err = -EADDRNOTAVAIL;
4934                 goto errout;
4935         }
4936
4937         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4938         if (!skb) {
4939                 err = -ENOBUFS;
4940                 goto errout_ifa;
4941         }
4942
4943         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4944                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4945         if (err < 0) {
4946                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4947                 WARN_ON(err == -EMSGSIZE);
4948                 kfree_skb(skb);
4949                 goto errout_ifa;
4950         }
4951         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4952 errout_ifa:
4953         in6_ifa_put(ifa);
4954 errout:
4955         return err;
4956 }
4957
4958 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4959 {
4960         struct sk_buff *skb;
4961         struct net *net = dev_net(ifa->idev->dev);
4962         int err = -ENOBUFS;
4963
4964         /* Don't send DELADDR notification for TENTATIVE address,
4965          * since NEWADDR notification is sent only after removing
4966          * TENTATIVE flag.
4967          */
4968         if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4969                 return;
4970
4971         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4972         if (!skb)
4973                 goto errout;
4974
4975         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4976         if (err < 0) {
4977                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4978                 WARN_ON(err == -EMSGSIZE);
4979                 kfree_skb(skb);
4980                 goto errout;
4981         }
4982         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4983         return;
4984 errout:
4985         if (err < 0)
4986                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4987 }
4988
4989 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4990                                 __s32 *array, int bytes)
4991 {
4992         BUG_ON(bytes < (DEVCONF_MAX * 4));
4993
4994         memset(array, 0, bytes);
4995         array[DEVCONF_FORWARDING] = cnf->forwarding;
4996         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4997         array[DEVCONF_MTU6] = cnf->mtu6;
4998         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4999         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5000         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5001         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5002         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5003         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5004                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5005         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5006                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5007         array[DEVCONF_RTR_SOLICIT_DELAY] =
5008                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5009         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5010         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5011                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5012         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5013                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5014         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5015         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5016         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5017         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5018         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5019         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5020         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5021         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5022         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5023 #ifdef CONFIG_IPV6_ROUTER_PREF
5024         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5025         array[DEVCONF_RTR_PROBE_INTERVAL] =
5026                 jiffies_to_msecs(cnf->rtr_probe_interval);
5027 #ifdef CONFIG_IPV6_ROUTE_INFO
5028         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5029         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5030 #endif
5031 #endif
5032         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5033         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5034 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5035         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5036         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5037 #endif
5038 #ifdef CONFIG_IPV6_MROUTE
5039         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5040 #endif
5041         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5042         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5043         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5044         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5045         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5046         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5047         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5048         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5049         /* we omit DEVCONF_STABLE_SECRET for now */
5050         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5051         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5052         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5053         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5054         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5055 #ifdef CONFIG_IPV6_SEG6_HMAC
5056         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5057 #endif
5058         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5059         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5060         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5061 }
5062
5063 static inline size_t inet6_ifla6_size(void)
5064 {
5065         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5066              + nla_total_size(sizeof(struct ifla_cacheinfo))
5067              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5068              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5069              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5070              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5071 }
5072
5073 static inline size_t inet6_if_nlmsg_size(void)
5074 {
5075         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5076                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5077                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5078                + nla_total_size(4) /* IFLA_MTU */
5079                + nla_total_size(4) /* IFLA_LINK */
5080                + nla_total_size(1) /* IFLA_OPERSTATE */
5081                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5082 }
5083
5084 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5085                                         int bytes)
5086 {
5087         int i;
5088         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5089         BUG_ON(pad < 0);
5090
5091         /* Use put_unaligned() because stats may not be aligned for u64. */
5092         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5093         for (i = 1; i < ICMP6_MIB_MAX; i++)
5094                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5095
5096         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5097 }
5098
5099 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5100                                         int bytes, size_t syncpoff)
5101 {
5102         int i, c;
5103         u64 buff[IPSTATS_MIB_MAX];
5104         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5105
5106         BUG_ON(pad < 0);
5107
5108         memset(buff, 0, sizeof(buff));
5109         buff[0] = IPSTATS_MIB_MAX;
5110
5111         for_each_possible_cpu(c) {
5112                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5113                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5114         }
5115
5116         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5117         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5118 }
5119
5120 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5121                              int bytes)
5122 {
5123         switch (attrtype) {
5124         case IFLA_INET6_STATS:
5125                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5126                                      offsetof(struct ipstats_mib, syncp));
5127                 break;
5128         case IFLA_INET6_ICMP6STATS:
5129                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5130                 break;
5131         }
5132 }
5133
5134 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5135                                   u32 ext_filter_mask)
5136 {
5137         struct nlattr *nla;
5138         struct ifla_cacheinfo ci;
5139
5140         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5141                 goto nla_put_failure;
5142         ci.max_reasm_len = IPV6_MAXPLEN;
5143         ci.tstamp = cstamp_delta(idev->tstamp);
5144         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5145         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5146         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5147                 goto nla_put_failure;
5148         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5149         if (!nla)
5150                 goto nla_put_failure;
5151         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5152
5153         /* XXX - MC not implemented */
5154
5155         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5156                 return 0;
5157
5158         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5159         if (!nla)
5160                 goto nla_put_failure;
5161         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5162
5163         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5164         if (!nla)
5165                 goto nla_put_failure;
5166         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5167
5168         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5169         if (!nla)
5170                 goto nla_put_failure;
5171
5172         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5173                 goto nla_put_failure;
5174
5175         read_lock_bh(&idev->lock);
5176         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5177         read_unlock_bh(&idev->lock);
5178
5179         return 0;
5180
5181 nla_put_failure:
5182         return -EMSGSIZE;
5183 }
5184
5185 static size_t inet6_get_link_af_size(const struct net_device *dev,
5186                                      u32 ext_filter_mask)
5187 {
5188         if (!__in6_dev_get(dev))
5189                 return 0;
5190
5191         return inet6_ifla6_size();
5192 }
5193
5194 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5195                               u32 ext_filter_mask)
5196 {
5197         struct inet6_dev *idev = __in6_dev_get(dev);
5198
5199         if (!idev)
5200                 return -ENODATA;
5201
5202         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5203                 return -EMSGSIZE;
5204
5205         return 0;
5206 }
5207
5208 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5209 {
5210         struct inet6_ifaddr *ifp;
5211         struct net_device *dev = idev->dev;
5212         bool clear_token, update_rs = false;
5213         struct in6_addr ll_addr;
5214
5215         ASSERT_RTNL();
5216
5217         if (!token)
5218                 return -EINVAL;
5219         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5220                 return -EINVAL;
5221         if (!ipv6_accept_ra(idev))
5222                 return -EINVAL;
5223         if (idev->cnf.rtr_solicits == 0)
5224                 return -EINVAL;
5225
5226         write_lock_bh(&idev->lock);
5227
5228         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5229         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5230
5231         write_unlock_bh(&idev->lock);
5232
5233         clear_token = ipv6_addr_any(token);
5234         if (clear_token)
5235                 goto update_lft;
5236
5237         if (!idev->dead && (idev->if_flags & IF_READY) &&
5238             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5239                              IFA_F_OPTIMISTIC)) {
5240                 /* If we're not ready, then normal ifup will take care
5241                  * of this. Otherwise, we need to request our rs here.
5242                  */
5243                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5244                 update_rs = true;
5245         }
5246
5247 update_lft:
5248         write_lock_bh(&idev->lock);
5249
5250         if (update_rs) {
5251                 idev->if_flags |= IF_RS_SENT;
5252                 idev->rs_interval = rfc3315_s14_backoff_init(
5253                         idev->cnf.rtr_solicit_interval);
5254                 idev->rs_probes = 1;
5255                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5256         }
5257
5258         /* Well, that's kinda nasty ... */
5259         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5260                 spin_lock(&ifp->lock);
5261                 if (ifp->tokenized) {
5262                         ifp->valid_lft = 0;
5263                         ifp->prefered_lft = 0;
5264                 }
5265                 spin_unlock(&ifp->lock);
5266         }
5267
5268         write_unlock_bh(&idev->lock);
5269         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5270         addrconf_verify_rtnl();
5271         return 0;
5272 }
5273
5274 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5275         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5276         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5277 };
5278
5279 static int inet6_validate_link_af(const struct net_device *dev,
5280                                   const struct nlattr *nla)
5281 {
5282         struct nlattr *tb[IFLA_INET6_MAX + 1];
5283
5284         if (dev && !__in6_dev_get(dev))
5285                 return -EAFNOSUPPORT;
5286
5287         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5288                                 NULL);
5289 }
5290
5291 static int check_addr_gen_mode(int mode)
5292 {
5293         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5294             mode != IN6_ADDR_GEN_MODE_NONE &&
5295             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5296             mode != IN6_ADDR_GEN_MODE_RANDOM)
5297                 return -EINVAL;
5298         return 1;
5299 }
5300
5301 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5302                                 int mode)
5303 {
5304         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5305             !idev->cnf.stable_secret.initialized &&
5306             !net->ipv6.devconf_dflt->stable_secret.initialized)
5307                 return -EINVAL;
5308         return 1;
5309 }
5310
5311 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5312 {
5313         int err = -EINVAL;
5314         struct inet6_dev *idev = __in6_dev_get(dev);
5315         struct nlattr *tb[IFLA_INET6_MAX + 1];
5316
5317         if (!idev)
5318                 return -EAFNOSUPPORT;
5319
5320         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5321                 BUG();
5322
5323         if (tb[IFLA_INET6_TOKEN]) {
5324                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5325                 if (err)
5326                         return err;
5327         }
5328
5329         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5330                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5331
5332                 if (check_addr_gen_mode(mode) < 0 ||
5333                     check_stable_privacy(idev, dev_net(dev), mode) < 0)
5334                         return -EINVAL;
5335
5336                 idev->cnf.addr_gen_mode = mode;
5337                 err = 0;
5338         }
5339
5340         return err;
5341 }
5342
5343 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5344                              u32 portid, u32 seq, int event, unsigned int flags)
5345 {
5346         struct net_device *dev = idev->dev;
5347         struct ifinfomsg *hdr;
5348         struct nlmsghdr *nlh;
5349         void *protoinfo;
5350
5351         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5352         if (!nlh)
5353                 return -EMSGSIZE;
5354
5355         hdr = nlmsg_data(nlh);
5356         hdr->ifi_family = AF_INET6;
5357         hdr->__ifi_pad = 0;
5358         hdr->ifi_type = dev->type;
5359         hdr->ifi_index = dev->ifindex;
5360         hdr->ifi_flags = dev_get_flags(dev);
5361         hdr->ifi_change = 0;
5362
5363         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5364             (dev->addr_len &&
5365              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5366             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5367             (dev->ifindex != dev_get_iflink(dev) &&
5368              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5369             nla_put_u8(skb, IFLA_OPERSTATE,
5370                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5371                 goto nla_put_failure;
5372         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5373         if (!protoinfo)
5374                 goto nla_put_failure;
5375
5376         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5377                 goto nla_put_failure;
5378
5379         nla_nest_end(skb, protoinfo);
5380         nlmsg_end(skb, nlh);
5381         return 0;
5382
5383 nla_put_failure:
5384         nlmsg_cancel(skb, nlh);
5385         return -EMSGSIZE;
5386 }
5387
5388 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5389 {
5390         struct net *net = sock_net(skb->sk);
5391         int h, s_h;
5392         int idx = 0, s_idx;
5393         struct net_device *dev;
5394         struct inet6_dev *idev;
5395         struct hlist_head *head;
5396
5397         s_h = cb->args[0];
5398         s_idx = cb->args[1];
5399
5400         rcu_read_lock();
5401         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5402                 idx = 0;
5403                 head = &net->dev_index_head[h];
5404                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5405                         if (idx < s_idx)
5406                                 goto cont;
5407                         idev = __in6_dev_get(dev);
5408                         if (!idev)
5409                                 goto cont;
5410                         if (inet6_fill_ifinfo(skb, idev,
5411                                               NETLINK_CB(cb->skb).portid,
5412                                               cb->nlh->nlmsg_seq,
5413                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5414                                 goto out;
5415 cont:
5416                         idx++;
5417                 }
5418         }
5419 out:
5420         rcu_read_unlock();
5421         cb->args[1] = idx;
5422         cb->args[0] = h;
5423
5424         return skb->len;
5425 }
5426
5427 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5428 {
5429         struct sk_buff *skb;
5430         struct net *net = dev_net(idev->dev);
5431         int err = -ENOBUFS;
5432
5433         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5434         if (!skb)
5435                 goto errout;
5436
5437         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5438         if (err < 0) {
5439                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5440                 WARN_ON(err == -EMSGSIZE);
5441                 kfree_skb(skb);
5442                 goto errout;
5443         }
5444         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5445         return;
5446 errout:
5447         if (err < 0)
5448                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5449 }
5450
5451 static inline size_t inet6_prefix_nlmsg_size(void)
5452 {
5453         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5454                + nla_total_size(sizeof(struct in6_addr))
5455                + nla_total_size(sizeof(struct prefix_cacheinfo));
5456 }
5457
5458 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5459                              struct prefix_info *pinfo, u32 portid, u32 seq,
5460                              int event, unsigned int flags)
5461 {
5462         struct prefixmsg *pmsg;
5463         struct nlmsghdr *nlh;
5464         struct prefix_cacheinfo ci;
5465
5466         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5467         if (!nlh)
5468                 return -EMSGSIZE;
5469
5470         pmsg = nlmsg_data(nlh);
5471         pmsg->prefix_family = AF_INET6;
5472         pmsg->prefix_pad1 = 0;
5473         pmsg->prefix_pad2 = 0;
5474         pmsg->prefix_ifindex = idev->dev->ifindex;
5475         pmsg->prefix_len = pinfo->prefix_len;
5476         pmsg->prefix_type = pinfo->type;
5477         pmsg->prefix_pad3 = 0;
5478         pmsg->prefix_flags = 0;
5479         if (pinfo->onlink)
5480                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5481         if (pinfo->autoconf)
5482                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5483
5484         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5485                 goto nla_put_failure;
5486         ci.preferred_time = ntohl(pinfo->prefered);
5487         ci.valid_time = ntohl(pinfo->valid);
5488         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5489                 goto nla_put_failure;
5490         nlmsg_end(skb, nlh);
5491         return 0;
5492
5493 nla_put_failure:
5494         nlmsg_cancel(skb, nlh);
5495         return -EMSGSIZE;
5496 }
5497
5498 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5499                          struct prefix_info *pinfo)
5500 {
5501         struct sk_buff *skb;
5502         struct net *net = dev_net(idev->dev);
5503         int err = -ENOBUFS;
5504
5505         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5506         if (!skb)
5507                 goto errout;
5508
5509         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5510         if (err < 0) {
5511                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5512                 WARN_ON(err == -EMSGSIZE);
5513                 kfree_skb(skb);
5514                 goto errout;
5515         }
5516         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5517         return;
5518 errout:
5519         if (err < 0)
5520                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5521 }
5522
5523 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5524 {
5525         struct net *net = dev_net(ifp->idev->dev);
5526
5527         if (event)
5528                 ASSERT_RTNL();
5529
5530         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5531
5532         switch (event) {
5533         case RTM_NEWADDR:
5534                 /*
5535                  * If the address was optimistic
5536                  * we inserted the route at the start of
5537                  * our DAD process, so we don't need
5538                  * to do it again
5539                  */
5540                 if (!(ifp->rt->rt6i_node))
5541                         ip6_ins_rt(ifp->rt);
5542                 if (ifp->idev->cnf.forwarding)
5543                         addrconf_join_anycast(ifp);
5544                 if (!ipv6_addr_any(&ifp->peer_addr))
5545                         addrconf_prefix_route(&ifp->peer_addr, 128,
5546                                               ifp->idev->dev, 0, 0);
5547                 break;
5548         case RTM_DELADDR:
5549                 if (ifp->idev->cnf.forwarding)
5550                         addrconf_leave_anycast(ifp);
5551                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5552                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5553                         struct rt6_info *rt;
5554
5555                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5556                                                        ifp->idev->dev, 0, 0);
5557                         if (rt)
5558                                 ip6_del_rt(rt);
5559                 }
5560                 if (ifp->rt) {
5561                         dst_hold(&ifp->rt->dst);
5562                         ip6_del_rt(ifp->rt);
5563                 }
5564                 rt_genid_bump_ipv6(net);
5565                 break;
5566         }
5567         atomic_inc(&net->ipv6.dev_addr_genid);
5568 }
5569
5570 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5571 {
5572         rcu_read_lock_bh();
5573         if (likely(ifp->idev->dead == 0))
5574                 __ipv6_ifa_notify(event, ifp);
5575         rcu_read_unlock_bh();
5576 }
5577
5578 #ifdef CONFIG_SYSCTL
5579
5580 static
5581 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5582                            void __user *buffer, size_t *lenp, loff_t *ppos)
5583 {
5584         int *valp = ctl->data;
5585         int val = *valp;
5586         loff_t pos = *ppos;
5587         struct ctl_table lctl;
5588         int ret;
5589
5590         /*
5591          * ctl->data points to idev->cnf.forwarding, we should
5592          * not modify it until we get the rtnl lock.
5593          */
5594         lctl = *ctl;
5595         lctl.data = &val;
5596
5597         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5598
5599         if (write)
5600                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5601         if (ret)
5602                 *ppos = pos;
5603         return ret;
5604 }
5605
5606 static
5607 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5608                         void __user *buffer, size_t *lenp, loff_t *ppos)
5609 {
5610         struct inet6_dev *idev = ctl->extra1;
5611         int min_mtu = IPV6_MIN_MTU;
5612         struct ctl_table lctl;
5613
5614         lctl = *ctl;
5615         lctl.extra1 = &min_mtu;
5616         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5617
5618         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5619 }
5620
5621 static void dev_disable_change(struct inet6_dev *idev)
5622 {
5623         struct netdev_notifier_info info;
5624
5625         if (!idev || !idev->dev)
5626                 return;
5627
5628         netdev_notifier_info_init(&info, idev->dev);
5629         if (idev->cnf.disable_ipv6)
5630                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5631         else
5632                 addrconf_notify(NULL, NETDEV_UP, &info);
5633 }
5634
5635 static void addrconf_disable_change(struct net *net, __s32 newf)
5636 {
5637         struct net_device *dev;
5638         struct inet6_dev *idev;
5639
5640         for_each_netdev(net, dev) {
5641                 idev = __in6_dev_get(dev);
5642                 if (idev) {
5643                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5644                         idev->cnf.disable_ipv6 = newf;
5645                         if (changed)
5646                                 dev_disable_change(idev);
5647                 }
5648         }
5649 }
5650
5651 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5652 {
5653         struct net *net;
5654         int old;
5655
5656         if (!rtnl_trylock())
5657                 return restart_syscall();
5658
5659         net = (struct net *)table->extra2;
5660         old = *p;
5661         *p = newf;
5662
5663         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5664                 rtnl_unlock();
5665                 return 0;
5666         }
5667
5668         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5669                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5670                 addrconf_disable_change(net, newf);
5671         } else if ((!newf) ^ (!old))
5672                 dev_disable_change((struct inet6_dev *)table->extra1);
5673
5674         rtnl_unlock();
5675         return 0;
5676 }
5677
5678 static
5679 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5680                             void __user *buffer, size_t *lenp, loff_t *ppos)
5681 {
5682         int *valp = ctl->data;
5683         int val = *valp;
5684         loff_t pos = *ppos;
5685         struct ctl_table lctl;
5686         int ret;
5687
5688         /*
5689          * ctl->data points to idev->cnf.disable_ipv6, we should
5690          * not modify it until we get the rtnl lock.
5691          */
5692         lctl = *ctl;
5693         lctl.data = &val;
5694
5695         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5696
5697         if (write)
5698                 ret = addrconf_disable_ipv6(ctl, valp, val);
5699         if (ret)
5700                 *ppos = pos;
5701         return ret;
5702 }
5703
5704 static
5705 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5706                               void __user *buffer, size_t *lenp, loff_t *ppos)
5707 {
5708         int *valp = ctl->data;
5709         int ret;
5710         int old, new;
5711
5712         old = *valp;
5713         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5714         new = *valp;
5715
5716         if (write && old != new) {
5717                 struct net *net = ctl->extra2;
5718
5719                 if (!rtnl_trylock())
5720                         return restart_syscall();
5721
5722                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5723                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5724                                                      NETCONFA_PROXY_NEIGH,
5725                                                      NETCONFA_IFINDEX_DEFAULT,
5726                                                      net->ipv6.devconf_dflt);
5727                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5728                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5729                                                      NETCONFA_PROXY_NEIGH,
5730                                                      NETCONFA_IFINDEX_ALL,
5731                                                      net->ipv6.devconf_all);
5732                 else {
5733                         struct inet6_dev *idev = ctl->extra1;
5734
5735                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5736                                                      NETCONFA_PROXY_NEIGH,
5737                                                      idev->dev->ifindex,
5738                                                      &idev->cnf);
5739                 }
5740                 rtnl_unlock();
5741         }
5742
5743         return ret;
5744 }
5745
5746 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5747                                          void __user *buffer, size_t *lenp,
5748                                          loff_t *ppos)
5749 {
5750         int ret = 0;
5751         int new_val;
5752         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5753         struct net *net = (struct net *)ctl->extra2;
5754
5755         if (!rtnl_trylock())
5756                 return restart_syscall();
5757
5758         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5759
5760         if (write) {
5761                 new_val = *((int *)ctl->data);
5762
5763                 if (check_addr_gen_mode(new_val) < 0) {
5764                         ret = -EINVAL;
5765                         goto out;
5766                 }
5767
5768                 /* request for default */
5769                 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5770                         ipv6_devconf_dflt.addr_gen_mode = new_val;
5771
5772                 /* request for individual net device */
5773                 } else {
5774                         if (!idev)
5775                                 goto out;
5776
5777                         if (check_stable_privacy(idev, net, new_val) < 0) {
5778                                 ret = -EINVAL;
5779                                 goto out;
5780                         }
5781
5782                         if (idev->cnf.addr_gen_mode != new_val) {
5783                                 idev->cnf.addr_gen_mode = new_val;
5784                                 addrconf_dev_config(idev->dev);
5785                         }
5786                 }
5787         }
5788
5789 out:
5790         rtnl_unlock();
5791
5792         return ret;
5793 }
5794
5795 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5796                                          void __user *buffer, size_t *lenp,
5797                                          loff_t *ppos)
5798 {
5799         int err;
5800         struct in6_addr addr;
5801         char str[IPV6_MAX_STRLEN];
5802         struct ctl_table lctl = *ctl;
5803         struct net *net = ctl->extra2;
5804         struct ipv6_stable_secret *secret = ctl->data;
5805
5806         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5807                 return -EIO;
5808
5809         lctl.maxlen = IPV6_MAX_STRLEN;
5810         lctl.data = str;
5811
5812         if (!rtnl_trylock())
5813                 return restart_syscall();
5814
5815         if (!write && !secret->initialized) {
5816                 err = -EIO;
5817                 goto out;
5818         }
5819
5820         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5821         if (err >= sizeof(str)) {
5822                 err = -EIO;
5823                 goto out;
5824         }
5825
5826         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5827         if (err || !write)
5828                 goto out;
5829
5830         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5831                 err = -EIO;
5832                 goto out;
5833         }
5834
5835         secret->initialized = true;
5836         secret->secret = addr;
5837
5838         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5839                 struct net_device *dev;
5840
5841                 for_each_netdev(net, dev) {
5842                         struct inet6_dev *idev = __in6_dev_get(dev);
5843
5844                         if (idev) {
5845                                 idev->cnf.addr_gen_mode =
5846                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5847                         }
5848                 }
5849         } else {
5850                 struct inet6_dev *idev = ctl->extra1;
5851
5852                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5853         }
5854
5855 out:
5856         rtnl_unlock();
5857
5858         return err;
5859 }
5860
5861 static
5862 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5863                                                 int write,
5864                                                 void __user *buffer,
5865                                                 size_t *lenp,
5866                                                 loff_t *ppos)
5867 {
5868         int *valp = ctl->data;
5869         int val = *valp;
5870         loff_t pos = *ppos;
5871         struct ctl_table lctl;
5872         int ret;
5873
5874         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5875          * we should not modify it until we get the rtnl lock.
5876          */
5877         lctl = *ctl;
5878         lctl.data = &val;
5879
5880         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5881
5882         if (write)
5883                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5884         if (ret)
5885                 *ppos = pos;
5886         return ret;
5887 }
5888
5889 static
5890 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5891 {
5892         if (rt) {
5893                 if (action)
5894                         rt->dst.flags |= DST_NOPOLICY;
5895                 else
5896                         rt->dst.flags &= ~DST_NOPOLICY;
5897         }
5898 }
5899
5900 static
5901 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5902 {
5903         struct inet6_ifaddr *ifa;
5904
5905         read_lock_bh(&idev->lock);
5906         list_for_each_entry(ifa, &idev->addr_list, if_list) {
5907                 spin_lock(&ifa->lock);
5908                 if (ifa->rt) {
5909                         struct rt6_info *rt = ifa->rt;
5910                         struct fib6_table *table = rt->rt6i_table;
5911                         int cpu;
5912
5913                         read_lock(&table->tb6_lock);
5914                         addrconf_set_nopolicy(ifa->rt, val);
5915                         if (rt->rt6i_pcpu) {
5916                                 for_each_possible_cpu(cpu) {
5917                                         struct rt6_info **rtp;
5918
5919                                         rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5920                                         addrconf_set_nopolicy(*rtp, val);
5921                                 }
5922                         }
5923                         read_unlock(&table->tb6_lock);
5924                 }
5925                 spin_unlock(&ifa->lock);
5926         }
5927         read_unlock_bh(&idev->lock);
5928 }
5929
5930 static
5931 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5932 {
5933         struct inet6_dev *idev;
5934         struct net *net;
5935
5936         if (!rtnl_trylock())
5937                 return restart_syscall();
5938
5939         *valp = val;
5940
5941         net = (struct net *)ctl->extra2;
5942         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5943                 rtnl_unlock();
5944                 return 0;
5945         }
5946
5947         if (valp == &net->ipv6.devconf_all->disable_policy)  {
5948                 struct net_device *dev;
5949
5950                 for_each_netdev(net, dev) {
5951                         idev = __in6_dev_get(dev);
5952                         if (idev)
5953                                 addrconf_disable_policy_idev(idev, val);
5954                 }
5955         } else {
5956                 idev = (struct inet6_dev *)ctl->extra1;
5957                 addrconf_disable_policy_idev(idev, val);
5958         }
5959
5960         rtnl_unlock();
5961         return 0;
5962 }
5963
5964 static
5965 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5966                                    void __user *buffer, size_t *lenp,
5967                                    loff_t *ppos)
5968 {
5969         int *valp = ctl->data;
5970         int val = *valp;
5971         loff_t pos = *ppos;
5972         struct ctl_table lctl;
5973         int ret;
5974
5975         lctl = *ctl;
5976         lctl.data = &val;
5977         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5978
5979         if (write && (*valp != val))
5980                 ret = addrconf_disable_policy(ctl, valp, val);
5981
5982         if (ret)
5983                 *ppos = pos;
5984
5985         return ret;
5986 }
5987
5988 static int minus_one = -1;
5989 static const int one = 1;
5990 static const int two_five_five = 255;
5991
5992 static const struct ctl_table addrconf_sysctl[] = {
5993         {
5994                 .procname       = "forwarding",
5995                 .data           = &ipv6_devconf.forwarding,
5996                 .maxlen         = sizeof(int),
5997                 .mode           = 0644,
5998                 .proc_handler   = addrconf_sysctl_forward,
5999         },
6000         {
6001                 .procname       = "hop_limit",
6002                 .data           = &ipv6_devconf.hop_limit,
6003                 .maxlen         = sizeof(int),
6004                 .mode           = 0644,
6005                 .proc_handler   = proc_dointvec_minmax,
6006                 .extra1         = (void *)&one,
6007                 .extra2         = (void *)&two_five_five,
6008         },
6009         {
6010                 .procname       = "mtu",
6011                 .data           = &ipv6_devconf.mtu6,
6012                 .maxlen         = sizeof(int),
6013                 .mode           = 0644,
6014                 .proc_handler   = addrconf_sysctl_mtu,
6015         },
6016         {
6017                 .procname       = "accept_ra",
6018                 .data           = &ipv6_devconf.accept_ra,
6019                 .maxlen         = sizeof(int),
6020                 .mode           = 0644,
6021                 .proc_handler   = proc_dointvec,
6022         },
6023         {
6024                 .procname       = "accept_redirects",
6025                 .data           = &ipv6_devconf.accept_redirects,
6026                 .maxlen         = sizeof(int),
6027                 .mode           = 0644,
6028                 .proc_handler   = proc_dointvec,
6029         },
6030         {
6031                 .procname       = "autoconf",
6032                 .data           = &ipv6_devconf.autoconf,
6033                 .maxlen         = sizeof(int),
6034                 .mode           = 0644,
6035                 .proc_handler   = proc_dointvec,
6036         },
6037         {
6038                 .procname       = "dad_transmits",
6039                 .data           = &ipv6_devconf.dad_transmits,
6040                 .maxlen         = sizeof(int),
6041                 .mode           = 0644,
6042                 .proc_handler   = proc_dointvec,
6043         },
6044         {
6045                 .procname       = "router_solicitations",
6046                 .data           = &ipv6_devconf.rtr_solicits,
6047                 .maxlen         = sizeof(int),
6048                 .mode           = 0644,
6049                 .proc_handler   = proc_dointvec_minmax,
6050                 .extra1         = &minus_one,
6051         },
6052         {
6053                 .procname       = "router_solicitation_interval",
6054                 .data           = &ipv6_devconf.rtr_solicit_interval,
6055                 .maxlen         = sizeof(int),
6056                 .mode           = 0644,
6057                 .proc_handler   = proc_dointvec_jiffies,
6058         },
6059         {
6060                 .procname       = "router_solicitation_max_interval",
6061                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6062                 .maxlen         = sizeof(int),
6063                 .mode           = 0644,
6064                 .proc_handler   = proc_dointvec_jiffies,
6065         },
6066         {
6067                 .procname       = "router_solicitation_delay",
6068                 .data           = &ipv6_devconf.rtr_solicit_delay,
6069                 .maxlen         = sizeof(int),
6070                 .mode           = 0644,
6071                 .proc_handler   = proc_dointvec_jiffies,
6072         },
6073         {
6074                 .procname       = "force_mld_version",
6075                 .data           = &ipv6_devconf.force_mld_version,
6076                 .maxlen         = sizeof(int),
6077                 .mode           = 0644,
6078                 .proc_handler   = proc_dointvec,
6079         },
6080         {
6081                 .procname       = "mldv1_unsolicited_report_interval",
6082                 .data           =
6083                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6084                 .maxlen         = sizeof(int),
6085                 .mode           = 0644,
6086                 .proc_handler   = proc_dointvec_ms_jiffies,
6087         },
6088         {
6089                 .procname       = "mldv2_unsolicited_report_interval",
6090                 .data           =
6091                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6092                 .maxlen         = sizeof(int),
6093                 .mode           = 0644,
6094                 .proc_handler   = proc_dointvec_ms_jiffies,
6095         },
6096         {
6097                 .procname       = "use_tempaddr",
6098                 .data           = &ipv6_devconf.use_tempaddr,
6099                 .maxlen         = sizeof(int),
6100                 .mode           = 0644,
6101                 .proc_handler   = proc_dointvec,
6102         },
6103         {
6104                 .procname       = "temp_valid_lft",
6105                 .data           = &ipv6_devconf.temp_valid_lft,
6106                 .maxlen         = sizeof(int),
6107                 .mode           = 0644,
6108                 .proc_handler   = proc_dointvec,
6109         },
6110         {
6111                 .procname       = "temp_prefered_lft",
6112                 .data           = &ipv6_devconf.temp_prefered_lft,
6113                 .maxlen         = sizeof(int),
6114                 .mode           = 0644,
6115                 .proc_handler   = proc_dointvec,
6116         },
6117         {
6118                 .procname       = "regen_max_retry",
6119                 .data           = &ipv6_devconf.regen_max_retry,
6120                 .maxlen         = sizeof(int),
6121                 .mode           = 0644,
6122                 .proc_handler   = proc_dointvec,
6123         },
6124         {
6125                 .procname       = "max_desync_factor",
6126                 .data           = &ipv6_devconf.max_desync_factor,
6127                 .maxlen         = sizeof(int),
6128                 .mode           = 0644,
6129                 .proc_handler   = proc_dointvec,
6130         },
6131         {
6132                 .procname       = "max_addresses",
6133                 .data           = &ipv6_devconf.max_addresses,
6134                 .maxlen         = sizeof(int),
6135                 .mode           = 0644,
6136                 .proc_handler   = proc_dointvec,
6137         },
6138         {
6139                 .procname       = "accept_ra_defrtr",
6140                 .data           = &ipv6_devconf.accept_ra_defrtr,
6141                 .maxlen         = sizeof(int),
6142                 .mode           = 0644,
6143                 .proc_handler   = proc_dointvec,
6144         },
6145         {
6146                 .procname       = "accept_ra_min_hop_limit",
6147                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6148                 .maxlen         = sizeof(int),
6149                 .mode           = 0644,
6150                 .proc_handler   = proc_dointvec,
6151         },
6152         {
6153                 .procname       = "accept_ra_pinfo",
6154                 .data           = &ipv6_devconf.accept_ra_pinfo,
6155                 .maxlen         = sizeof(int),
6156                 .mode           = 0644,
6157                 .proc_handler   = proc_dointvec,
6158         },
6159 #ifdef CONFIG_IPV6_ROUTER_PREF
6160         {
6161                 .procname       = "accept_ra_rtr_pref",
6162                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6163                 .maxlen         = sizeof(int),
6164                 .mode           = 0644,
6165                 .proc_handler   = proc_dointvec,
6166         },
6167         {
6168                 .procname       = "router_probe_interval",
6169                 .data           = &ipv6_devconf.rtr_probe_interval,
6170                 .maxlen         = sizeof(int),
6171                 .mode           = 0644,
6172                 .proc_handler   = proc_dointvec_jiffies,
6173         },
6174 #ifdef CONFIG_IPV6_ROUTE_INFO
6175         {
6176                 .procname       = "accept_ra_rt_info_min_plen",
6177                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6178                 .maxlen         = sizeof(int),
6179                 .mode           = 0644,
6180                 .proc_handler   = proc_dointvec,
6181         },
6182         {
6183                 .procname       = "accept_ra_rt_info_max_plen",
6184                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6185                 .maxlen         = sizeof(int),
6186                 .mode           = 0644,
6187                 .proc_handler   = proc_dointvec,
6188         },
6189 #endif
6190 #endif
6191         {
6192                 .procname       = "proxy_ndp",
6193                 .data           = &ipv6_devconf.proxy_ndp,
6194                 .maxlen         = sizeof(int),
6195                 .mode           = 0644,
6196                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6197         },
6198         {
6199                 .procname       = "accept_source_route",
6200                 .data           = &ipv6_devconf.accept_source_route,
6201                 .maxlen         = sizeof(int),
6202                 .mode           = 0644,
6203                 .proc_handler   = proc_dointvec,
6204         },
6205 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6206         {
6207                 .procname       = "optimistic_dad",
6208                 .data           = &ipv6_devconf.optimistic_dad,
6209                 .maxlen         = sizeof(int),
6210                 .mode           = 0644,
6211                 .proc_handler   = proc_dointvec,
6212         },
6213         {
6214                 .procname       = "use_optimistic",
6215                 .data           = &ipv6_devconf.use_optimistic,
6216                 .maxlen         = sizeof(int),
6217                 .mode           = 0644,
6218                 .proc_handler   = proc_dointvec,
6219         },
6220 #endif
6221 #ifdef CONFIG_IPV6_MROUTE
6222         {
6223                 .procname       = "mc_forwarding",
6224                 .data           = &ipv6_devconf.mc_forwarding,
6225                 .maxlen         = sizeof(int),
6226                 .mode           = 0444,
6227                 .proc_handler   = proc_dointvec,
6228         },
6229 #endif
6230         {
6231                 .procname       = "disable_ipv6",
6232                 .data           = &ipv6_devconf.disable_ipv6,
6233                 .maxlen         = sizeof(int),
6234                 .mode           = 0644,
6235                 .proc_handler   = addrconf_sysctl_disable,
6236         },
6237         {
6238                 .procname       = "accept_dad",
6239                 .data           = &ipv6_devconf.accept_dad,
6240                 .maxlen         = sizeof(int),
6241                 .mode           = 0644,
6242                 .proc_handler   = proc_dointvec,
6243         },
6244         {
6245                 .procname       = "force_tllao",
6246                 .data           = &ipv6_devconf.force_tllao,
6247                 .maxlen         = sizeof(int),
6248                 .mode           = 0644,
6249                 .proc_handler   = proc_dointvec
6250         },
6251         {
6252                 .procname       = "ndisc_notify",
6253                 .data           = &ipv6_devconf.ndisc_notify,
6254                 .maxlen         = sizeof(int),
6255                 .mode           = 0644,
6256                 .proc_handler   = proc_dointvec
6257         },
6258         {
6259                 .procname       = "suppress_frag_ndisc",
6260                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6261                 .maxlen         = sizeof(int),
6262                 .mode           = 0644,
6263                 .proc_handler   = proc_dointvec
6264         },
6265         {
6266                 .procname       = "accept_ra_from_local",
6267                 .data           = &ipv6_devconf.accept_ra_from_local,
6268                 .maxlen         = sizeof(int),
6269                 .mode           = 0644,
6270                 .proc_handler   = proc_dointvec,
6271         },
6272         {
6273                 .procname       = "accept_ra_mtu",
6274                 .data           = &ipv6_devconf.accept_ra_mtu,
6275                 .maxlen         = sizeof(int),
6276                 .mode           = 0644,
6277                 .proc_handler   = proc_dointvec,
6278         },
6279         {
6280                 .procname       = "stable_secret",
6281                 .data           = &ipv6_devconf.stable_secret,
6282                 .maxlen         = IPV6_MAX_STRLEN,
6283                 .mode           = 0600,
6284                 .proc_handler   = addrconf_sysctl_stable_secret,
6285         },
6286         {
6287                 .procname       = "use_oif_addrs_only",
6288                 .data           = &ipv6_devconf.use_oif_addrs_only,
6289                 .maxlen         = sizeof(int),
6290                 .mode           = 0644,
6291                 .proc_handler   = proc_dointvec,
6292         },
6293         {
6294                 .procname       = "ignore_routes_with_linkdown",
6295                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6296                 .maxlen         = sizeof(int),
6297                 .mode           = 0644,
6298                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6299         },
6300         {
6301                 .procname       = "drop_unicast_in_l2_multicast",
6302                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6303                 .maxlen         = sizeof(int),
6304                 .mode           = 0644,
6305                 .proc_handler   = proc_dointvec,
6306         },
6307         {
6308                 .procname       = "drop_unsolicited_na",
6309                 .data           = &ipv6_devconf.drop_unsolicited_na,
6310                 .maxlen         = sizeof(int),
6311                 .mode           = 0644,
6312                 .proc_handler   = proc_dointvec,
6313         },
6314         {
6315                 .procname       = "keep_addr_on_down",
6316                 .data           = &ipv6_devconf.keep_addr_on_down,
6317                 .maxlen         = sizeof(int),
6318                 .mode           = 0644,
6319                 .proc_handler   = proc_dointvec,
6320
6321         },
6322         {
6323                 .procname       = "seg6_enabled",
6324                 .data           = &ipv6_devconf.seg6_enabled,
6325                 .maxlen         = sizeof(int),
6326                 .mode           = 0644,
6327                 .proc_handler   = proc_dointvec,
6328         },
6329 #ifdef CONFIG_IPV6_SEG6_HMAC
6330         {
6331                 .procname       = "seg6_require_hmac",
6332                 .data           = &ipv6_devconf.seg6_require_hmac,
6333                 .maxlen         = sizeof(int),
6334                 .mode           = 0644,
6335                 .proc_handler   = proc_dointvec,
6336         },
6337 #endif
6338         {
6339                 .procname       = "enhanced_dad",
6340                 .data           = &ipv6_devconf.enhanced_dad,
6341                 .maxlen         = sizeof(int),
6342                 .mode           = 0644,
6343                 .proc_handler   = proc_dointvec,
6344         },
6345         {
6346                 .procname               = "addr_gen_mode",
6347                 .data                   = &ipv6_devconf.addr_gen_mode,
6348                 .maxlen                 = sizeof(int),
6349                 .mode                   = 0644,
6350                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6351         },
6352         {
6353                 .procname       = "disable_policy",
6354                 .data           = &ipv6_devconf.disable_policy,
6355                 .maxlen         = sizeof(int),
6356                 .mode           = 0644,
6357                 .proc_handler   = addrconf_sysctl_disable_policy,
6358         },
6359         {
6360                 /* sentinel */
6361         }
6362 };
6363
6364 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6365                 struct inet6_dev *idev, struct ipv6_devconf *p)
6366 {
6367         int i, ifindex;
6368         struct ctl_table *table;
6369         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6370
6371         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6372         if (!table)
6373                 goto out;
6374
6375         for (i = 0; table[i].data; i++) {
6376                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6377                 /* If one of these is already set, then it is not safe to
6378                  * overwrite either of them: this makes proc_dointvec_minmax
6379                  * usable.
6380                  */
6381                 if (!table[i].extra1 && !table[i].extra2) {
6382                         table[i].extra1 = idev; /* embedded; no ref */
6383                         table[i].extra2 = net;
6384                 }
6385         }
6386
6387         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6388
6389         p->sysctl_header = register_net_sysctl(net, path, table);
6390         if (!p->sysctl_header)
6391                 goto free;
6392
6393         if (!strcmp(dev_name, "all"))
6394                 ifindex = NETCONFA_IFINDEX_ALL;
6395         else if (!strcmp(dev_name, "default"))
6396                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6397         else
6398                 ifindex = idev->dev->ifindex;
6399         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6400                                      ifindex, p);
6401         return 0;
6402
6403 free:
6404         kfree(table);
6405 out:
6406         return -ENOBUFS;
6407 }
6408
6409 static void __addrconf_sysctl_unregister(struct net *net,
6410                                          struct ipv6_devconf *p, int ifindex)
6411 {
6412         struct ctl_table *table;
6413
6414         if (!p->sysctl_header)
6415                 return;
6416
6417         table = p->sysctl_header->ctl_table_arg;
6418         unregister_net_sysctl_table(p->sysctl_header);
6419         p->sysctl_header = NULL;
6420         kfree(table);
6421
6422         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6423 }
6424
6425 static int addrconf_sysctl_register(struct inet6_dev *idev)
6426 {
6427         int err;
6428
6429         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6430                 return -EINVAL;
6431
6432         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6433                                     &ndisc_ifinfo_sysctl_change);
6434         if (err)
6435                 return err;
6436         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6437                                          idev, &idev->cnf);
6438         if (err)
6439                 neigh_sysctl_unregister(idev->nd_parms);
6440
6441         return err;
6442 }
6443
6444 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6445 {
6446         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6447                                      idev->dev->ifindex);
6448         neigh_sysctl_unregister(idev->nd_parms);
6449 }
6450
6451
6452 #endif
6453
6454 static int __net_init addrconf_init_net(struct net *net)
6455 {
6456         int err = -ENOMEM;
6457         struct ipv6_devconf *all, *dflt;
6458
6459         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6460         if (!all)
6461                 goto err_alloc_all;
6462
6463         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6464         if (!dflt)
6465                 goto err_alloc_dflt;
6466
6467         /* these will be inherited by all namespaces */
6468         dflt->autoconf = ipv6_defaults.autoconf;
6469         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6470
6471         dflt->stable_secret.initialized = false;
6472         all->stable_secret.initialized = false;
6473
6474         net->ipv6.devconf_all = all;
6475         net->ipv6.devconf_dflt = dflt;
6476
6477 #ifdef CONFIG_SYSCTL
6478         err = __addrconf_sysctl_register(net, "all", NULL, all);
6479         if (err < 0)
6480                 goto err_reg_all;
6481
6482         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6483         if (err < 0)
6484                 goto err_reg_dflt;
6485 #endif
6486         return 0;
6487
6488 #ifdef CONFIG_SYSCTL
6489 err_reg_dflt:
6490         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6491 err_reg_all:
6492         kfree(dflt);
6493 #endif
6494 err_alloc_dflt:
6495         kfree(all);
6496 err_alloc_all:
6497         return err;
6498 }
6499
6500 static void __net_exit addrconf_exit_net(struct net *net)
6501 {
6502 #ifdef CONFIG_SYSCTL
6503         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6504                                      NETCONFA_IFINDEX_DEFAULT);
6505         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6506                                      NETCONFA_IFINDEX_ALL);
6507 #endif
6508         kfree(net->ipv6.devconf_dflt);
6509         kfree(net->ipv6.devconf_all);
6510 }
6511
6512 static struct pernet_operations addrconf_ops = {
6513         .init = addrconf_init_net,
6514         .exit = addrconf_exit_net,
6515 };
6516
6517 static struct rtnl_af_ops inet6_ops __read_mostly = {
6518         .family           = AF_INET6,
6519         .fill_link_af     = inet6_fill_link_af,
6520         .get_link_af_size = inet6_get_link_af_size,
6521         .validate_link_af = inet6_validate_link_af,
6522         .set_link_af      = inet6_set_link_af,
6523 };
6524
6525 /*
6526  *      Init / cleanup code
6527  */
6528
6529 int __init addrconf_init(void)
6530 {
6531         struct inet6_dev *idev;
6532         int i, err;
6533
6534         err = ipv6_addr_label_init();
6535         if (err < 0) {
6536                 pr_crit("%s: cannot initialize default policy table: %d\n",
6537                         __func__, err);
6538                 goto out;
6539         }
6540
6541         err = register_pernet_subsys(&addrconf_ops);
6542         if (err < 0)
6543                 goto out_addrlabel;
6544
6545         addrconf_wq = create_workqueue("ipv6_addrconf");
6546         if (!addrconf_wq) {
6547                 err = -ENOMEM;
6548                 goto out_nowq;
6549         }
6550
6551         /* The addrconf netdev notifier requires that loopback_dev
6552          * has it's ipv6 private information allocated and setup
6553          * before it can bring up and give link-local addresses
6554          * to other devices which are up.
6555          *
6556          * Unfortunately, loopback_dev is not necessarily the first
6557          * entry in the global dev_base list of net devices.  In fact,
6558          * it is likely to be the very last entry on that list.
6559          * So this causes the notifier registry below to try and
6560          * give link-local addresses to all devices besides loopback_dev
6561          * first, then loopback_dev, which cases all the non-loopback_dev
6562          * devices to fail to get a link-local address.
6563          *
6564          * So, as a temporary fix, allocate the ipv6 structure for
6565          * loopback_dev first by hand.
6566          * Longer term, all of the dependencies ipv6 has upon the loopback
6567          * device and it being up should be removed.
6568          */
6569         rtnl_lock();
6570         idev = ipv6_add_dev(init_net.loopback_dev);
6571         rtnl_unlock();
6572         if (IS_ERR(idev)) {
6573                 err = PTR_ERR(idev);
6574                 goto errlo;
6575         }
6576
6577         ip6_route_init_special_entries();
6578
6579         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6580                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6581
6582         register_netdevice_notifier(&ipv6_dev_notf);
6583
6584         addrconf_verify();
6585
6586         rtnl_af_register(&inet6_ops);
6587
6588         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6589                               NULL);
6590         if (err < 0)
6591                 goto errout;
6592
6593         /* Only the first call to __rtnl_register can fail */
6594         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6595         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6596         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6597                         inet6_dump_ifaddr, NULL);
6598         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6599                         inet6_dump_ifmcaddr, NULL);
6600         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6601                         inet6_dump_ifacaddr, NULL);
6602         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6603                         inet6_netconf_dump_devconf, NULL);
6604
6605         ipv6_addr_label_rtnl_register();
6606
6607         return 0;
6608 errout:
6609         rtnl_af_unregister(&inet6_ops);
6610         unregister_netdevice_notifier(&ipv6_dev_notf);
6611 errlo:
6612         destroy_workqueue(addrconf_wq);
6613 out_nowq:
6614         unregister_pernet_subsys(&addrconf_ops);
6615 out_addrlabel:
6616         ipv6_addr_label_cleanup();
6617 out:
6618         return err;
6619 }
6620
6621 void addrconf_cleanup(void)
6622 {
6623         struct net_device *dev;
6624         int i;
6625
6626         unregister_netdevice_notifier(&ipv6_dev_notf);
6627         unregister_pernet_subsys(&addrconf_ops);
6628         ipv6_addr_label_cleanup();
6629
6630         rtnl_lock();
6631
6632         __rtnl_af_unregister(&inet6_ops);
6633
6634         /* clean dev list */
6635         for_each_netdev(&init_net, dev) {
6636                 if (__in6_dev_get(dev) == NULL)
6637                         continue;
6638                 addrconf_ifdown(dev, 1);
6639         }
6640         addrconf_ifdown(init_net.loopback_dev, 2);
6641
6642         /*
6643          *      Check hash table.
6644          */
6645         spin_lock_bh(&addrconf_hash_lock);
6646         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6647                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6648         spin_unlock_bh(&addrconf_hash_lock);
6649         cancel_delayed_work(&addr_chk_work);
6650         rtnl_unlock();
6651
6652         destroy_workqueue(addrconf_wq);
6653 }