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;
1026         /* No need to add the TENTATIVE flag for addresses with NODAD */
1027         if (!(flags & IFA_F_NODAD))
1028                 ifa->flags |= IFA_F_TENTATIVE;
1029         ifa->valid_lft = valid_lft;
1030         ifa->prefered_lft = prefered_lft;
1031         ifa->cstamp = ifa->tstamp = jiffies;
1032         ifa->tokenized = false;
1033
1034         ifa->rt = rt;
1035
1036         ifa->idev = idev;
1037         in6_dev_hold(idev);
1038         /* For caller */
1039         in6_ifa_hold(ifa);
1040
1041         /* Add to big hash table */
1042         hash = inet6_addr_hash(addr);
1043
1044         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1045         spin_unlock(&addrconf_hash_lock);
1046
1047         write_lock(&idev->lock);
1048         /* Add to inet6_dev unicast addr list. */
1049         ipv6_link_dev_addr(idev, ifa);
1050
1051         if (ifa->flags&IFA_F_TEMPORARY) {
1052                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1053                 in6_ifa_hold(ifa);
1054         }
1055
1056         in6_ifa_hold(ifa);
1057         write_unlock(&idev->lock);
1058 out2:
1059         rcu_read_unlock_bh();
1060
1061         if (likely(err == 0))
1062                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1063         else {
1064                 kfree(ifa);
1065                 ifa = ERR_PTR(err);
1066         }
1067
1068         return ifa;
1069 out:
1070         spin_unlock(&addrconf_hash_lock);
1071         goto out2;
1072 }
1073
1074 enum cleanup_prefix_rt_t {
1075         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1076         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1077         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1078 };
1079
1080 /*
1081  * Check, whether the prefix for ifp would still need a prefix route
1082  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1083  * constants.
1084  *
1085  * 1) we don't purge prefix if address was not permanent.
1086  *    prefix is managed by its own lifetime.
1087  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1088  * 3) if there are no addresses, delete prefix.
1089  * 4) if there are still other permanent address(es),
1090  *    corresponding prefix is still permanent.
1091  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1092  *    don't purge the prefix, assume user space is managing it.
1093  * 6) otherwise, update prefix lifetime to the
1094  *    longest valid lifetime among the corresponding
1095  *    addresses on the device.
1096  *    Note: subsequent RA will update lifetime.
1097  **/
1098 static enum cleanup_prefix_rt_t
1099 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1100 {
1101         struct inet6_ifaddr *ifa;
1102         struct inet6_dev *idev = ifp->idev;
1103         unsigned long lifetime;
1104         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1105
1106         *expires = jiffies;
1107
1108         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1109                 if (ifa == ifp)
1110                         continue;
1111                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1112                                        ifp->prefix_len))
1113                         continue;
1114                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1115                         return CLEANUP_PREFIX_RT_NOP;
1116
1117                 action = CLEANUP_PREFIX_RT_EXPIRE;
1118
1119                 spin_lock(&ifa->lock);
1120
1121                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1122                 /*
1123                  * Note: Because this address is
1124                  * not permanent, lifetime <
1125                  * LONG_MAX / HZ here.
1126                  */
1127                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1128                         *expires = ifa->tstamp + lifetime * HZ;
1129                 spin_unlock(&ifa->lock);
1130         }
1131
1132         return action;
1133 }
1134
1135 static void
1136 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1137 {
1138         struct rt6_info *rt;
1139
1140         rt = addrconf_get_prefix_route(&ifp->addr,
1141                                        ifp->prefix_len,
1142                                        ifp->idev->dev,
1143                                        0, RTF_GATEWAY | RTF_DEFAULT);
1144         if (rt) {
1145                 if (del_rt)
1146                         ip6_del_rt(rt);
1147                 else {
1148                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1149                                 rt6_set_expires(rt, expires);
1150                         ip6_rt_put(rt);
1151                 }
1152         }
1153 }
1154
1155
1156 /* This function wants to get referenced ifp and releases it before return */
1157
1158 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1159 {
1160         int state;
1161         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1162         unsigned long expires;
1163
1164         ASSERT_RTNL();
1165
1166         spin_lock_bh(&ifp->lock);
1167         state = ifp->state;
1168         ifp->state = INET6_IFADDR_STATE_DEAD;
1169         spin_unlock_bh(&ifp->lock);
1170
1171         if (state == INET6_IFADDR_STATE_DEAD)
1172                 goto out;
1173
1174         spin_lock_bh(&addrconf_hash_lock);
1175         hlist_del_init_rcu(&ifp->addr_lst);
1176         spin_unlock_bh(&addrconf_hash_lock);
1177
1178         write_lock_bh(&ifp->idev->lock);
1179
1180         if (ifp->flags&IFA_F_TEMPORARY) {
1181                 list_del(&ifp->tmp_list);
1182                 if (ifp->ifpub) {
1183                         in6_ifa_put(ifp->ifpub);
1184                         ifp->ifpub = NULL;
1185                 }
1186                 __in6_ifa_put(ifp);
1187         }
1188
1189         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1190                 action = check_cleanup_prefix_route(ifp, &expires);
1191
1192         list_del_init(&ifp->if_list);
1193         __in6_ifa_put(ifp);
1194
1195         write_unlock_bh(&ifp->idev->lock);
1196
1197         addrconf_del_dad_work(ifp);
1198
1199         ipv6_ifa_notify(RTM_DELADDR, ifp);
1200
1201         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1202
1203         if (action != CLEANUP_PREFIX_RT_NOP) {
1204                 cleanup_prefix_route(ifp, expires,
1205                         action == CLEANUP_PREFIX_RT_DEL);
1206         }
1207
1208         /* clean up prefsrc entries */
1209         rt6_remove_prefsrc(ifp);
1210 out:
1211         in6_ifa_put(ifp);
1212 }
1213
1214 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1215 {
1216         struct inet6_dev *idev = ifp->idev;
1217         struct in6_addr addr, *tmpaddr;
1218         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1219         unsigned long regen_advance;
1220         int tmp_plen;
1221         int ret = 0;
1222         u32 addr_flags;
1223         unsigned long now = jiffies;
1224         long max_desync_factor;
1225         s32 cnf_temp_preferred_lft;
1226
1227         write_lock_bh(&idev->lock);
1228         if (ift) {
1229                 spin_lock_bh(&ift->lock);
1230                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1231                 spin_unlock_bh(&ift->lock);
1232                 tmpaddr = &addr;
1233         } else {
1234                 tmpaddr = NULL;
1235         }
1236 retry:
1237         in6_dev_hold(idev);
1238         if (idev->cnf.use_tempaddr <= 0) {
1239                 write_unlock_bh(&idev->lock);
1240                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1241                 in6_dev_put(idev);
1242                 ret = -1;
1243                 goto out;
1244         }
1245         spin_lock_bh(&ifp->lock);
1246         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1247                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1248                 spin_unlock_bh(&ifp->lock);
1249                 write_unlock_bh(&idev->lock);
1250                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1251                         __func__);
1252                 in6_dev_put(idev);
1253                 ret = -1;
1254                 goto out;
1255         }
1256         in6_ifa_hold(ifp);
1257         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1258         ipv6_try_regen_rndid(idev, tmpaddr);
1259         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1260         age = (now - ifp->tstamp) / HZ;
1261
1262         regen_advance = idev->cnf.regen_max_retry *
1263                         idev->cnf.dad_transmits *
1264                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1265
1266         /* recalculate max_desync_factor each time and update
1267          * idev->desync_factor if it's larger
1268          */
1269         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1270         max_desync_factor = min_t(__u32,
1271                                   idev->cnf.max_desync_factor,
1272                                   cnf_temp_preferred_lft - regen_advance);
1273
1274         if (unlikely(idev->desync_factor > max_desync_factor)) {
1275                 if (max_desync_factor > 0) {
1276                         get_random_bytes(&idev->desync_factor,
1277                                          sizeof(idev->desync_factor));
1278                         idev->desync_factor %= max_desync_factor;
1279                 } else {
1280                         idev->desync_factor = 0;
1281                 }
1282         }
1283
1284         tmp_valid_lft = min_t(__u32,
1285                               ifp->valid_lft,
1286                               idev->cnf.temp_valid_lft + age);
1287         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1288                             idev->desync_factor;
1289         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1290         tmp_plen = ifp->prefix_len;
1291         tmp_tstamp = ifp->tstamp;
1292         spin_unlock_bh(&ifp->lock);
1293
1294         write_unlock_bh(&idev->lock);
1295
1296         /* A temporary address is created only if this calculated Preferred
1297          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1298          * an implementation must not create a temporary address with a zero
1299          * Preferred Lifetime.
1300          * Use age calculation as in addrconf_verify to avoid unnecessary
1301          * temporary addresses being generated.
1302          */
1303         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1304         if (tmp_prefered_lft <= regen_advance + age) {
1305                 in6_ifa_put(ifp);
1306                 in6_dev_put(idev);
1307                 ret = -1;
1308                 goto out;
1309         }
1310
1311         addr_flags = IFA_F_TEMPORARY;
1312         /* set in addrconf_prefix_rcv() */
1313         if (ifp->flags & IFA_F_OPTIMISTIC)
1314                 addr_flags |= IFA_F_OPTIMISTIC;
1315
1316         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1317                             ipv6_addr_scope(&addr), addr_flags,
1318                             tmp_valid_lft, tmp_prefered_lft);
1319         if (IS_ERR(ift)) {
1320                 in6_ifa_put(ifp);
1321                 in6_dev_put(idev);
1322                 pr_info("%s: retry temporary address regeneration\n", __func__);
1323                 tmpaddr = &addr;
1324                 write_lock_bh(&idev->lock);
1325                 goto retry;
1326         }
1327
1328         spin_lock_bh(&ift->lock);
1329         ift->ifpub = ifp;
1330         ift->cstamp = now;
1331         ift->tstamp = tmp_tstamp;
1332         spin_unlock_bh(&ift->lock);
1333
1334         addrconf_dad_start(ift);
1335         in6_ifa_put(ift);
1336         in6_dev_put(idev);
1337 out:
1338         return ret;
1339 }
1340
1341 /*
1342  *      Choose an appropriate source address (RFC3484)
1343  */
1344 enum {
1345         IPV6_SADDR_RULE_INIT = 0,
1346         IPV6_SADDR_RULE_LOCAL,
1347         IPV6_SADDR_RULE_SCOPE,
1348         IPV6_SADDR_RULE_PREFERRED,
1349 #ifdef CONFIG_IPV6_MIP6
1350         IPV6_SADDR_RULE_HOA,
1351 #endif
1352         IPV6_SADDR_RULE_OIF,
1353         IPV6_SADDR_RULE_LABEL,
1354         IPV6_SADDR_RULE_PRIVACY,
1355         IPV6_SADDR_RULE_ORCHID,
1356         IPV6_SADDR_RULE_PREFIX,
1357 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1358         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1359 #endif
1360         IPV6_SADDR_RULE_MAX
1361 };
1362
1363 struct ipv6_saddr_score {
1364         int                     rule;
1365         int                     addr_type;
1366         struct inet6_ifaddr     *ifa;
1367         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1368         int                     scopedist;
1369         int                     matchlen;
1370 };
1371
1372 struct ipv6_saddr_dst {
1373         const struct in6_addr *addr;
1374         int ifindex;
1375         int scope;
1376         int label;
1377         unsigned int prefs;
1378 };
1379
1380 static inline int ipv6_saddr_preferred(int type)
1381 {
1382         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1383                 return 1;
1384         return 0;
1385 }
1386
1387 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1388 {
1389 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1390         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1391 #else
1392         return false;
1393 #endif
1394 }
1395
1396 static int ipv6_get_saddr_eval(struct net *net,
1397                                struct ipv6_saddr_score *score,
1398                                struct ipv6_saddr_dst *dst,
1399                                int i)
1400 {
1401         int ret;
1402
1403         if (i <= score->rule) {
1404                 switch (i) {
1405                 case IPV6_SADDR_RULE_SCOPE:
1406                         ret = score->scopedist;
1407                         break;
1408                 case IPV6_SADDR_RULE_PREFIX:
1409                         ret = score->matchlen;
1410                         break;
1411                 default:
1412                         ret = !!test_bit(i, score->scorebits);
1413                 }
1414                 goto out;
1415         }
1416
1417         switch (i) {
1418         case IPV6_SADDR_RULE_INIT:
1419                 /* Rule 0: remember if hiscore is not ready yet */
1420                 ret = !!score->ifa;
1421                 break;
1422         case IPV6_SADDR_RULE_LOCAL:
1423                 /* Rule 1: Prefer same address */
1424                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1425                 break;
1426         case IPV6_SADDR_RULE_SCOPE:
1427                 /* Rule 2: Prefer appropriate scope
1428                  *
1429                  *      ret
1430                  *       ^
1431                  *    -1 |  d 15
1432                  *    ---+--+-+---> scope
1433                  *       |
1434                  *       |             d is scope of the destination.
1435                  *  B-d  |  \
1436                  *       |   \      <- smaller scope is better if
1437                  *  B-15 |    \        if scope is enough for destination.
1438                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1439                  * d-C-1 | /
1440                  *       |/         <- greater is better
1441                  *   -C  /             if scope is not enough for destination.
1442                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1443                  *
1444                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1445                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1446                  * Assume B = 0 and we get C > 29.
1447                  */
1448                 ret = __ipv6_addr_src_scope(score->addr_type);
1449                 if (ret >= dst->scope)
1450                         ret = -ret;
1451                 else
1452                         ret -= 128;     /* 30 is enough */
1453                 score->scopedist = ret;
1454                 break;
1455         case IPV6_SADDR_RULE_PREFERRED:
1456             {
1457                 /* Rule 3: Avoid deprecated and optimistic addresses */
1458                 u8 avoid = IFA_F_DEPRECATED;
1459
1460                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1461                         avoid |= IFA_F_OPTIMISTIC;
1462                 ret = ipv6_saddr_preferred(score->addr_type) ||
1463                       !(score->ifa->flags & avoid);
1464                 break;
1465             }
1466 #ifdef CONFIG_IPV6_MIP6
1467         case IPV6_SADDR_RULE_HOA:
1468             {
1469                 /* Rule 4: Prefer home address */
1470                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1471                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1472                 break;
1473             }
1474 #endif
1475         case IPV6_SADDR_RULE_OIF:
1476                 /* Rule 5: Prefer outgoing interface */
1477                 ret = (!dst->ifindex ||
1478                        dst->ifindex == score->ifa->idev->dev->ifindex);
1479                 break;
1480         case IPV6_SADDR_RULE_LABEL:
1481                 /* Rule 6: Prefer matching label */
1482                 ret = ipv6_addr_label(net,
1483                                       &score->ifa->addr, score->addr_type,
1484                                       score->ifa->idev->dev->ifindex) == dst->label;
1485                 break;
1486         case IPV6_SADDR_RULE_PRIVACY:
1487             {
1488                 /* Rule 7: Prefer public address
1489                  * Note: prefer temporary address if use_tempaddr >= 2
1490                  */
1491                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1492                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1493                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1494                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1495                 break;
1496             }
1497         case IPV6_SADDR_RULE_ORCHID:
1498                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1499                  *          non-ORCHID vs non-ORCHID
1500                  */
1501                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1502                         ipv6_addr_orchid(dst->addr));
1503                 break;
1504         case IPV6_SADDR_RULE_PREFIX:
1505                 /* Rule 8: Use longest matching prefix */
1506                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1507                 if (ret > score->ifa->prefix_len)
1508                         ret = score->ifa->prefix_len;
1509                 score->matchlen = ret;
1510                 break;
1511 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1512         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1513                 /* Optimistic addresses still have lower precedence than other
1514                  * preferred addresses.
1515                  */
1516                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1517                 break;
1518 #endif
1519         default:
1520                 ret = 0;
1521         }
1522
1523         if (ret)
1524                 __set_bit(i, score->scorebits);
1525         score->rule = i;
1526 out:
1527         return ret;
1528 }
1529
1530 static int __ipv6_dev_get_saddr(struct net *net,
1531                                 struct ipv6_saddr_dst *dst,
1532                                 struct inet6_dev *idev,
1533                                 struct ipv6_saddr_score *scores,
1534                                 int hiscore_idx)
1535 {
1536         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1537
1538         read_lock_bh(&idev->lock);
1539         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1540                 int i;
1541
1542                 /*
1543                  * - Tentative Address (RFC2462 section 5.4)
1544                  *  - A tentative address is not considered
1545                  *    "assigned to an interface" in the traditional
1546                  *    sense, unless it is also flagged as optimistic.
1547                  * - Candidate Source Address (section 4)
1548                  *  - In any case, anycast addresses, multicast
1549                  *    addresses, and the unspecified address MUST
1550                  *    NOT be included in a candidate set.
1551                  */
1552                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1553                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1554                         continue;
1555
1556                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1557
1558                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1559                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1560                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1561                                             idev->dev->name);
1562                         continue;
1563                 }
1564
1565                 score->rule = -1;
1566                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1567
1568                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1569                         int minihiscore, miniscore;
1570
1571                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1572                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1573
1574                         if (minihiscore > miniscore) {
1575                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1576                                     score->scopedist > 0) {
1577                                         /*
1578                                          * special case:
1579                                          * each remaining entry
1580                                          * has too small (not enough)
1581                                          * scope, because ifa entries
1582                                          * are sorted by their scope
1583                                          * values.
1584                                          */
1585                                         goto out;
1586                                 }
1587                                 break;
1588                         } else if (minihiscore < miniscore) {
1589                                 if (hiscore->ifa)
1590                                         in6_ifa_put(hiscore->ifa);
1591
1592                                 in6_ifa_hold(score->ifa);
1593
1594                                 swap(hiscore, score);
1595                                 hiscore_idx = 1 - hiscore_idx;
1596
1597                                 /* restore our iterator */
1598                                 score->ifa = hiscore->ifa;
1599
1600                                 break;
1601                         }
1602                 }
1603         }
1604 out:
1605         read_unlock_bh(&idev->lock);
1606         return hiscore_idx;
1607 }
1608
1609 static int ipv6_get_saddr_master(struct net *net,
1610                                  const struct net_device *dst_dev,
1611                                  const struct net_device *master,
1612                                  struct ipv6_saddr_dst *dst,
1613                                  struct ipv6_saddr_score *scores,
1614                                  int hiscore_idx)
1615 {
1616         struct inet6_dev *idev;
1617
1618         idev = __in6_dev_get(dst_dev);
1619         if (idev)
1620                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1621                                                    scores, hiscore_idx);
1622
1623         idev = __in6_dev_get(master);
1624         if (idev)
1625                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1626                                                    scores, hiscore_idx);
1627
1628         return hiscore_idx;
1629 }
1630
1631 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1632                        const struct in6_addr *daddr, unsigned int prefs,
1633                        struct in6_addr *saddr)
1634 {
1635         struct ipv6_saddr_score scores[2], *hiscore;
1636         struct ipv6_saddr_dst dst;
1637         struct inet6_dev *idev;
1638         struct net_device *dev;
1639         int dst_type;
1640         bool use_oif_addr = false;
1641         int hiscore_idx = 0;
1642
1643         dst_type = __ipv6_addr_type(daddr);
1644         dst.addr = daddr;
1645         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1646         dst.scope = __ipv6_addr_src_scope(dst_type);
1647         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1648         dst.prefs = prefs;
1649
1650         scores[hiscore_idx].rule = -1;
1651         scores[hiscore_idx].ifa = NULL;
1652
1653         rcu_read_lock();
1654
1655         /* Candidate Source Address (section 4)
1656          *  - multicast and link-local destination address,
1657          *    the set of candidate source address MUST only
1658          *    include addresses assigned to interfaces
1659          *    belonging to the same link as the outgoing
1660          *    interface.
1661          * (- For site-local destination addresses, the
1662          *    set of candidate source addresses MUST only
1663          *    include addresses assigned to interfaces
1664          *    belonging to the same site as the outgoing
1665          *    interface.)
1666          *  - "It is RECOMMENDED that the candidate source addresses
1667          *    be the set of unicast addresses assigned to the
1668          *    interface that will be used to send to the destination
1669          *    (the 'outgoing' interface)." (RFC 6724)
1670          */
1671         if (dst_dev) {
1672                 idev = __in6_dev_get(dst_dev);
1673                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1674                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1675                     (idev && idev->cnf.use_oif_addrs_only)) {
1676                         use_oif_addr = true;
1677                 }
1678         }
1679
1680         if (use_oif_addr) {
1681                 if (idev)
1682                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1683         } else {
1684                 const struct net_device *master;
1685                 int master_idx = 0;
1686
1687                 /* if dst_dev exists and is enslaved to an L3 device, then
1688                  * prefer addresses from dst_dev and then the master over
1689                  * any other enslaved devices in the L3 domain.
1690                  */
1691                 master = l3mdev_master_dev_rcu(dst_dev);
1692                 if (master) {
1693                         master_idx = master->ifindex;
1694
1695                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1696                                                             master, &dst,
1697                                                             scores, hiscore_idx);
1698
1699                         if (scores[hiscore_idx].ifa)
1700                                 goto out;
1701                 }
1702
1703                 for_each_netdev_rcu(net, dev) {
1704                         /* only consider addresses on devices in the
1705                          * same L3 domain
1706                          */
1707                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1708                                 continue;
1709                         idev = __in6_dev_get(dev);
1710                         if (!idev)
1711                                 continue;
1712                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1713                 }
1714         }
1715
1716 out:
1717         rcu_read_unlock();
1718
1719         hiscore = &scores[hiscore_idx];
1720         if (!hiscore->ifa)
1721                 return -EADDRNOTAVAIL;
1722
1723         *saddr = hiscore->ifa->addr;
1724         in6_ifa_put(hiscore->ifa);
1725         return 0;
1726 }
1727 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1728
1729 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1730                       u32 banned_flags)
1731 {
1732         struct inet6_ifaddr *ifp;
1733         int err = -EADDRNOTAVAIL;
1734
1735         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1736                 if (ifp->scope > IFA_LINK)
1737                         break;
1738                 if (ifp->scope == IFA_LINK &&
1739                     !(ifp->flags & banned_flags)) {
1740                         *addr = ifp->addr;
1741                         err = 0;
1742                         break;
1743                 }
1744         }
1745         return err;
1746 }
1747
1748 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1749                     u32 banned_flags)
1750 {
1751         struct inet6_dev *idev;
1752         int err = -EADDRNOTAVAIL;
1753
1754         rcu_read_lock();
1755         idev = __in6_dev_get(dev);
1756         if (idev) {
1757                 read_lock_bh(&idev->lock);
1758                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1759                 read_unlock_bh(&idev->lock);
1760         }
1761         rcu_read_unlock();
1762         return err;
1763 }
1764
1765 static int ipv6_count_addresses(struct inet6_dev *idev)
1766 {
1767         int cnt = 0;
1768         struct inet6_ifaddr *ifp;
1769
1770         read_lock_bh(&idev->lock);
1771         list_for_each_entry(ifp, &idev->addr_list, if_list)
1772                 cnt++;
1773         read_unlock_bh(&idev->lock);
1774         return cnt;
1775 }
1776
1777 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1778                   const struct net_device *dev, int strict)
1779 {
1780         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1781 }
1782 EXPORT_SYMBOL(ipv6_chk_addr);
1783
1784 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1785                             const struct net_device *dev, int strict,
1786                             u32 banned_flags)
1787 {
1788         struct inet6_ifaddr *ifp;
1789         unsigned int hash = inet6_addr_hash(addr);
1790         u32 ifp_flags;
1791
1792         rcu_read_lock_bh();
1793         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1794                 if (!net_eq(dev_net(ifp->idev->dev), net))
1795                         continue;
1796                 /* Decouple optimistic from tentative for evaluation here.
1797                  * Ban optimistic addresses explicitly, when required.
1798                  */
1799                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1800                             ? (ifp->flags&~IFA_F_TENTATIVE)
1801                             : ifp->flags;
1802                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1803                     !(ifp_flags&banned_flags) &&
1804                     (!dev || ifp->idev->dev == dev ||
1805                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1806                         rcu_read_unlock_bh();
1807                         return 1;
1808                 }
1809         }
1810
1811         rcu_read_unlock_bh();
1812         return 0;
1813 }
1814 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1815
1816 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1817                                struct net_device *dev)
1818 {
1819         unsigned int hash = inet6_addr_hash(addr);
1820         struct inet6_ifaddr *ifp;
1821
1822         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1823                 if (!net_eq(dev_net(ifp->idev->dev), net))
1824                         continue;
1825                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1826                         if (!dev || ifp->idev->dev == dev)
1827                                 return true;
1828                 }
1829         }
1830         return false;
1831 }
1832
1833 /* Compares an address/prefix_len with addresses on device @dev.
1834  * If one is found it returns true.
1835  */
1836 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1837         const unsigned int prefix_len, struct net_device *dev)
1838 {
1839         struct inet6_dev *idev;
1840         struct inet6_ifaddr *ifa;
1841         bool ret = false;
1842
1843         rcu_read_lock();
1844         idev = __in6_dev_get(dev);
1845         if (idev) {
1846                 read_lock_bh(&idev->lock);
1847                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1848                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1849                         if (ret)
1850                                 break;
1851                 }
1852                 read_unlock_bh(&idev->lock);
1853         }
1854         rcu_read_unlock();
1855
1856         return ret;
1857 }
1858 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1859
1860 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1861 {
1862         struct inet6_dev *idev;
1863         struct inet6_ifaddr *ifa;
1864         int     onlink;
1865
1866         onlink = 0;
1867         rcu_read_lock();
1868         idev = __in6_dev_get(dev);
1869         if (idev) {
1870                 read_lock_bh(&idev->lock);
1871                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1872                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1873                                                    ifa->prefix_len);
1874                         if (onlink)
1875                                 break;
1876                 }
1877                 read_unlock_bh(&idev->lock);
1878         }
1879         rcu_read_unlock();
1880         return onlink;
1881 }
1882 EXPORT_SYMBOL(ipv6_chk_prefix);
1883
1884 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1885                                      struct net_device *dev, int strict)
1886 {
1887         struct inet6_ifaddr *ifp, *result = NULL;
1888         unsigned int hash = inet6_addr_hash(addr);
1889
1890         rcu_read_lock_bh();
1891         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1892                 if (!net_eq(dev_net(ifp->idev->dev), net))
1893                         continue;
1894                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1895                         if (!dev || ifp->idev->dev == dev ||
1896                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1897                                 result = ifp;
1898                                 in6_ifa_hold(ifp);
1899                                 break;
1900                         }
1901                 }
1902         }
1903         rcu_read_unlock_bh();
1904
1905         return result;
1906 }
1907
1908 /* Gets referenced address, destroys ifaddr */
1909
1910 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1911 {
1912         if (dad_failed)
1913                 ifp->flags |= IFA_F_DADFAILED;
1914
1915         if (ifp->flags&IFA_F_PERMANENT) {
1916                 spin_lock_bh(&ifp->lock);
1917                 addrconf_del_dad_work(ifp);
1918                 ifp->flags |= IFA_F_TENTATIVE;
1919                 spin_unlock_bh(&ifp->lock);
1920                 if (dad_failed)
1921                         ipv6_ifa_notify(0, ifp);
1922                 in6_ifa_put(ifp);
1923         } else if (ifp->flags&IFA_F_TEMPORARY) {
1924                 struct inet6_ifaddr *ifpub;
1925                 spin_lock_bh(&ifp->lock);
1926                 ifpub = ifp->ifpub;
1927                 if (ifpub) {
1928                         in6_ifa_hold(ifpub);
1929                         spin_unlock_bh(&ifp->lock);
1930                         ipv6_create_tempaddr(ifpub, ifp);
1931                         in6_ifa_put(ifpub);
1932                 } else {
1933                         spin_unlock_bh(&ifp->lock);
1934                 }
1935                 ipv6_del_addr(ifp);
1936         } else {
1937                 ipv6_del_addr(ifp);
1938         }
1939 }
1940
1941 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1942 {
1943         int err = -ENOENT;
1944
1945         spin_lock_bh(&ifp->lock);
1946         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1947                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1948                 err = 0;
1949         }
1950         spin_unlock_bh(&ifp->lock);
1951
1952         return err;
1953 }
1954
1955 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1956 {
1957         struct inet6_dev *idev = ifp->idev;
1958         struct net *net = dev_net(ifp->idev->dev);
1959
1960         if (addrconf_dad_end(ifp)) {
1961                 in6_ifa_put(ifp);
1962                 return;
1963         }
1964
1965         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1966                              ifp->idev->dev->name, &ifp->addr);
1967
1968         spin_lock_bh(&ifp->lock);
1969
1970         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1971                 int scope = ifp->scope;
1972                 u32 flags = ifp->flags;
1973                 struct in6_addr new_addr;
1974                 struct inet6_ifaddr *ifp2;
1975                 u32 valid_lft, preferred_lft;
1976                 int pfxlen = ifp->prefix_len;
1977                 int retries = ifp->stable_privacy_retry + 1;
1978
1979                 if (retries > net->ipv6.sysctl.idgen_retries) {
1980                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1981                                              ifp->idev->dev->name);
1982                         goto errdad;
1983                 }
1984
1985                 new_addr = ifp->addr;
1986                 if (ipv6_generate_stable_address(&new_addr, retries,
1987                                                  idev))
1988                         goto errdad;
1989
1990                 valid_lft = ifp->valid_lft;
1991                 preferred_lft = ifp->prefered_lft;
1992
1993                 spin_unlock_bh(&ifp->lock);
1994
1995                 if (idev->cnf.max_addresses &&
1996                     ipv6_count_addresses(idev) >=
1997                     idev->cnf.max_addresses)
1998                         goto lock_errdad;
1999
2000                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2001                                      ifp->idev->dev->name);
2002
2003                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2004                                      scope, flags, valid_lft,
2005                                      preferred_lft);
2006                 if (IS_ERR(ifp2))
2007                         goto lock_errdad;
2008
2009                 spin_lock_bh(&ifp2->lock);
2010                 ifp2->stable_privacy_retry = retries;
2011                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2012                 spin_unlock_bh(&ifp2->lock);
2013
2014                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2015                 in6_ifa_put(ifp2);
2016 lock_errdad:
2017                 spin_lock_bh(&ifp->lock);
2018         }
2019
2020 errdad:
2021         /* transition from _POSTDAD to _ERRDAD */
2022         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2023         spin_unlock_bh(&ifp->lock);
2024
2025         addrconf_mod_dad_work(ifp, 0);
2026         in6_ifa_put(ifp);
2027 }
2028
2029 /* Join to solicited addr multicast group.
2030  * caller must hold RTNL */
2031 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2032 {
2033         struct in6_addr maddr;
2034
2035         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2036                 return;
2037
2038         addrconf_addr_solict_mult(addr, &maddr);
2039         ipv6_dev_mc_inc(dev, &maddr);
2040 }
2041
2042 /* caller must hold RTNL */
2043 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2044 {
2045         struct in6_addr maddr;
2046
2047         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2048                 return;
2049
2050         addrconf_addr_solict_mult(addr, &maddr);
2051         __ipv6_dev_mc_dec(idev, &maddr);
2052 }
2053
2054 /* caller must hold RTNL */
2055 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2056 {
2057         struct in6_addr addr;
2058
2059         if (ifp->prefix_len >= 127) /* RFC 6164 */
2060                 return;
2061         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2062         if (ipv6_addr_any(&addr))
2063                 return;
2064         __ipv6_dev_ac_inc(ifp->idev, &addr);
2065 }
2066
2067 /* caller must hold RTNL */
2068 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2069 {
2070         struct in6_addr addr;
2071
2072         if (ifp->prefix_len >= 127) /* RFC 6164 */
2073                 return;
2074         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2075         if (ipv6_addr_any(&addr))
2076                 return;
2077         __ipv6_dev_ac_dec(ifp->idev, &addr);
2078 }
2079
2080 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2081 {
2082         switch (dev->addr_len) {
2083         case ETH_ALEN:
2084                 memcpy(eui, dev->dev_addr, 3);
2085                 eui[3] = 0xFF;
2086                 eui[4] = 0xFE;
2087                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2088                 break;
2089         case EUI64_ADDR_LEN:
2090                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2091                 eui[0] ^= 2;
2092                 break;
2093         default:
2094                 return -1;
2095         }
2096
2097         return 0;
2098 }
2099
2100 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2101 {
2102         union fwnet_hwaddr *ha;
2103
2104         if (dev->addr_len != FWNET_ALEN)
2105                 return -1;
2106
2107         ha = (union fwnet_hwaddr *)dev->dev_addr;
2108
2109         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2110         eui[0] ^= 2;
2111         return 0;
2112 }
2113
2114 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2115 {
2116         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2117         if (dev->addr_len != ARCNET_ALEN)
2118                 return -1;
2119         memset(eui, 0, 7);
2120         eui[7] = *(u8 *)dev->dev_addr;
2121         return 0;
2122 }
2123
2124 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2125 {
2126         if (dev->addr_len != INFINIBAND_ALEN)
2127                 return -1;
2128         memcpy(eui, dev->dev_addr + 12, 8);
2129         eui[0] |= 2;
2130         return 0;
2131 }
2132
2133 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2134 {
2135         if (addr == 0)
2136                 return -1;
2137         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2138                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2139                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2140                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2141                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2142                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2143         eui[1] = 0;
2144         eui[2] = 0x5E;
2145         eui[3] = 0xFE;
2146         memcpy(eui + 4, &addr, 4);
2147         return 0;
2148 }
2149
2150 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2151 {
2152         if (dev->priv_flags & IFF_ISATAP)
2153                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2154         return -1;
2155 }
2156
2157 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2158 {
2159         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2160 }
2161
2162 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2163 {
2164         memcpy(eui, dev->perm_addr, 3);
2165         memcpy(eui + 5, dev->perm_addr + 3, 3);
2166         eui[3] = 0xFF;
2167         eui[4] = 0xFE;
2168         eui[0] ^= 2;
2169         return 0;
2170 }
2171
2172 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2173 {
2174         switch (dev->type) {
2175         case ARPHRD_ETHER:
2176         case ARPHRD_FDDI:
2177                 return addrconf_ifid_eui48(eui, dev);
2178         case ARPHRD_ARCNET:
2179                 return addrconf_ifid_arcnet(eui, dev);
2180         case ARPHRD_INFINIBAND:
2181                 return addrconf_ifid_infiniband(eui, dev);
2182         case ARPHRD_SIT:
2183                 return addrconf_ifid_sit(eui, dev);
2184         case ARPHRD_IPGRE:
2185         case ARPHRD_TUNNEL:
2186                 return addrconf_ifid_gre(eui, dev);
2187         case ARPHRD_6LOWPAN:
2188                 return addrconf_ifid_6lowpan(eui, dev);
2189         case ARPHRD_IEEE1394:
2190                 return addrconf_ifid_ieee1394(eui, dev);
2191         case ARPHRD_TUNNEL6:
2192         case ARPHRD_IP6GRE:
2193                 return addrconf_ifid_ip6tnl(eui, dev);
2194         }
2195         return -1;
2196 }
2197
2198 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2199 {
2200         int err = -1;
2201         struct inet6_ifaddr *ifp;
2202
2203         read_lock_bh(&idev->lock);
2204         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2205                 if (ifp->scope > IFA_LINK)
2206                         break;
2207                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2208                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2209                         err = 0;
2210                         break;
2211                 }
2212         }
2213         read_unlock_bh(&idev->lock);
2214         return err;
2215 }
2216
2217 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2218 static void ipv6_regen_rndid(struct inet6_dev *idev)
2219 {
2220 regen:
2221         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2222         idev->rndid[0] &= ~0x02;
2223
2224         /*
2225          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2226          * check if generated address is not inappropriate
2227          *
2228          *  - Reserved subnet anycast (RFC 2526)
2229          *      11111101 11....11 1xxxxxxx
2230          *  - ISATAP (RFC4214) 6.1
2231          *      00-00-5E-FE-xx-xx-xx-xx
2232          *  - value 0
2233          *  - XXX: already assigned to an address on the device
2234          */
2235         if (idev->rndid[0] == 0xfd &&
2236             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2237             (idev->rndid[7]&0x80))
2238                 goto regen;
2239         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2240                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2241                         goto regen;
2242                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2243                         goto regen;
2244         }
2245 }
2246
2247 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2248 {
2249         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2250                 ipv6_regen_rndid(idev);
2251 }
2252
2253 /*
2254  *      Add prefix route.
2255  */
2256
2257 static void
2258 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2259                       unsigned long expires, u32 flags)
2260 {
2261         struct fib6_config cfg = {
2262                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2263                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2264                 .fc_ifindex = dev->ifindex,
2265                 .fc_expires = expires,
2266                 .fc_dst_len = plen,
2267                 .fc_flags = RTF_UP | flags,
2268                 .fc_nlinfo.nl_net = dev_net(dev),
2269                 .fc_protocol = RTPROT_KERNEL,
2270         };
2271
2272         cfg.fc_dst = *pfx;
2273
2274         /* Prevent useless cloning on PtP SIT.
2275            This thing is done here expecting that the whole
2276            class of non-broadcast devices need not cloning.
2277          */
2278 #if IS_ENABLED(CONFIG_IPV6_SIT)
2279         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2280                 cfg.fc_flags |= RTF_NONEXTHOP;
2281 #endif
2282
2283         ip6_route_add(&cfg);
2284 }
2285
2286
2287 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2288                                                   int plen,
2289                                                   const struct net_device *dev,
2290                                                   u32 flags, u32 noflags)
2291 {
2292         struct fib6_node *fn;
2293         struct rt6_info *rt = NULL;
2294         struct fib6_table *table;
2295         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2296
2297         table = fib6_get_table(dev_net(dev), tb_id);
2298         if (!table)
2299                 return NULL;
2300
2301         read_lock_bh(&table->tb6_lock);
2302         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2303         if (!fn)
2304                 goto out;
2305
2306         noflags |= RTF_CACHE;
2307         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2308                 if (rt->dst.dev->ifindex != dev->ifindex)
2309                         continue;
2310                 if ((rt->rt6i_flags & flags) != flags)
2311                         continue;
2312                 if ((rt->rt6i_flags & noflags) != 0)
2313                         continue;
2314                 dst_hold(&rt->dst);
2315                 break;
2316         }
2317 out:
2318         read_unlock_bh(&table->tb6_lock);
2319         return rt;
2320 }
2321
2322
2323 /* Create "default" multicast route to the interface */
2324
2325 static void addrconf_add_mroute(struct net_device *dev)
2326 {
2327         struct fib6_config cfg = {
2328                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2329                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2330                 .fc_ifindex = dev->ifindex,
2331                 .fc_dst_len = 8,
2332                 .fc_flags = RTF_UP,
2333                 .fc_nlinfo.nl_net = dev_net(dev),
2334         };
2335
2336         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2337
2338         ip6_route_add(&cfg);
2339 }
2340
2341 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2342 {
2343         struct inet6_dev *idev;
2344
2345         ASSERT_RTNL();
2346
2347         idev = ipv6_find_idev(dev);
2348         if (!idev)
2349                 return ERR_PTR(-ENOBUFS);
2350
2351         if (idev->cnf.disable_ipv6)
2352                 return ERR_PTR(-EACCES);
2353
2354         /* Add default multicast route */
2355         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2356                 addrconf_add_mroute(dev);
2357
2358         return idev;
2359 }
2360
2361 static void manage_tempaddrs(struct inet6_dev *idev,
2362                              struct inet6_ifaddr *ifp,
2363                              __u32 valid_lft, __u32 prefered_lft,
2364                              bool create, unsigned long now)
2365 {
2366         u32 flags;
2367         struct inet6_ifaddr *ift;
2368
2369         read_lock_bh(&idev->lock);
2370         /* update all temporary addresses in the list */
2371         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2372                 int age, max_valid, max_prefered;
2373
2374                 if (ifp != ift->ifpub)
2375                         continue;
2376
2377                 /* RFC 4941 section 3.3:
2378                  * If a received option will extend the lifetime of a public
2379                  * address, the lifetimes of temporary addresses should
2380                  * be extended, subject to the overall constraint that no
2381                  * temporary addresses should ever remain "valid" or "preferred"
2382                  * for a time longer than (TEMP_VALID_LIFETIME) or
2383                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2384                  */
2385                 age = (now - ift->cstamp) / HZ;
2386                 max_valid = idev->cnf.temp_valid_lft - age;
2387                 if (max_valid < 0)
2388                         max_valid = 0;
2389
2390                 max_prefered = idev->cnf.temp_prefered_lft -
2391                                idev->desync_factor - age;
2392                 if (max_prefered < 0)
2393                         max_prefered = 0;
2394
2395                 if (valid_lft > max_valid)
2396                         valid_lft = max_valid;
2397
2398                 if (prefered_lft > max_prefered)
2399                         prefered_lft = max_prefered;
2400
2401                 spin_lock(&ift->lock);
2402                 flags = ift->flags;
2403                 ift->valid_lft = valid_lft;
2404                 ift->prefered_lft = prefered_lft;
2405                 ift->tstamp = now;
2406                 if (prefered_lft > 0)
2407                         ift->flags &= ~IFA_F_DEPRECATED;
2408
2409                 spin_unlock(&ift->lock);
2410                 if (!(flags&IFA_F_TENTATIVE))
2411                         ipv6_ifa_notify(0, ift);
2412         }
2413
2414         if ((create || list_empty(&idev->tempaddr_list)) &&
2415             idev->cnf.use_tempaddr > 0) {
2416                 /* When a new public address is created as described
2417                  * in [ADDRCONF], also create a new temporary address.
2418                  * Also create a temporary address if it's enabled but
2419                  * no temporary address currently exists.
2420                  */
2421                 read_unlock_bh(&idev->lock);
2422                 ipv6_create_tempaddr(ifp, NULL);
2423         } else {
2424                 read_unlock_bh(&idev->lock);
2425         }
2426 }
2427
2428 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2429 {
2430         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2431                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2432 }
2433
2434 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2435                                  const struct prefix_info *pinfo,
2436                                  struct inet6_dev *in6_dev,
2437                                  const struct in6_addr *addr, int addr_type,
2438                                  u32 addr_flags, bool sllao, bool tokenized,
2439                                  __u32 valid_lft, u32 prefered_lft)
2440 {
2441         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2442         int create = 0, update_lft = 0;
2443
2444         if (!ifp && valid_lft) {
2445                 int max_addresses = in6_dev->cnf.max_addresses;
2446
2447 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2448                 if (in6_dev->cnf.optimistic_dad &&
2449                     !net->ipv6.devconf_all->forwarding && sllao)
2450                         addr_flags |= IFA_F_OPTIMISTIC;
2451 #endif
2452
2453                 /* Do not allow to create too much of autoconfigured
2454                  * addresses; this would be too easy way to crash kernel.
2455                  */
2456                 if (!max_addresses ||
2457                     ipv6_count_addresses(in6_dev) < max_addresses)
2458                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2459                                             pinfo->prefix_len,
2460                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2461                                             addr_flags, valid_lft,
2462                                             prefered_lft);
2463
2464                 if (IS_ERR_OR_NULL(ifp))
2465                         return -1;
2466
2467                 update_lft = 0;
2468                 create = 1;
2469                 spin_lock_bh(&ifp->lock);
2470                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2471                 ifp->cstamp = jiffies;
2472                 ifp->tokenized = tokenized;
2473                 spin_unlock_bh(&ifp->lock);
2474                 addrconf_dad_start(ifp);
2475         }
2476
2477         if (ifp) {
2478                 u32 flags;
2479                 unsigned long now;
2480                 u32 stored_lft;
2481
2482                 /* update lifetime (RFC2462 5.5.3 e) */
2483                 spin_lock_bh(&ifp->lock);
2484                 now = jiffies;
2485                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2486                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2487                 else
2488                         stored_lft = 0;
2489                 if (!update_lft && !create && stored_lft) {
2490                         const u32 minimum_lft = min_t(u32,
2491                                 stored_lft, MIN_VALID_LIFETIME);
2492                         valid_lft = max(valid_lft, minimum_lft);
2493
2494                         /* RFC4862 Section 5.5.3e:
2495                          * "Note that the preferred lifetime of the
2496                          *  corresponding address is always reset to
2497                          *  the Preferred Lifetime in the received
2498                          *  Prefix Information option, regardless of
2499                          *  whether the valid lifetime is also reset or
2500                          *  ignored."
2501                          *
2502                          * So we should always update prefered_lft here.
2503                          */
2504                         update_lft = 1;
2505                 }
2506
2507                 if (update_lft) {
2508                         ifp->valid_lft = valid_lft;
2509                         ifp->prefered_lft = prefered_lft;
2510                         ifp->tstamp = now;
2511                         flags = ifp->flags;
2512                         ifp->flags &= ~IFA_F_DEPRECATED;
2513                         spin_unlock_bh(&ifp->lock);
2514
2515                         if (!(flags&IFA_F_TENTATIVE))
2516                                 ipv6_ifa_notify(0, ifp);
2517                 } else
2518                         spin_unlock_bh(&ifp->lock);
2519
2520                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2521                                  create, now);
2522
2523                 in6_ifa_put(ifp);
2524                 addrconf_verify();
2525         }
2526
2527         return 0;
2528 }
2529 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2530
2531 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2532 {
2533         struct prefix_info *pinfo;
2534         __u32 valid_lft;
2535         __u32 prefered_lft;
2536         int addr_type, err;
2537         u32 addr_flags = 0;
2538         struct inet6_dev *in6_dev;
2539         struct net *net = dev_net(dev);
2540
2541         pinfo = (struct prefix_info *) opt;
2542
2543         if (len < sizeof(struct prefix_info)) {
2544                 ADBG("addrconf: prefix option too short\n");
2545                 return;
2546         }
2547
2548         /*
2549          *      Validation checks ([ADDRCONF], page 19)
2550          */
2551
2552         addr_type = ipv6_addr_type(&pinfo->prefix);
2553
2554         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2555                 return;
2556
2557         valid_lft = ntohl(pinfo->valid);
2558         prefered_lft = ntohl(pinfo->prefered);
2559
2560         if (prefered_lft > valid_lft) {
2561                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2562                 return;
2563         }
2564
2565         in6_dev = in6_dev_get(dev);
2566
2567         if (!in6_dev) {
2568                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2569                                     dev->name);
2570                 return;
2571         }
2572
2573         /*
2574          *      Two things going on here:
2575          *      1) Add routes for on-link prefixes
2576          *      2) Configure prefixes with the auto flag set
2577          */
2578
2579         if (pinfo->onlink) {
2580                 struct rt6_info *rt;
2581                 unsigned long rt_expires;
2582
2583                 /* Avoid arithmetic overflow. Really, we could
2584                  * save rt_expires in seconds, likely valid_lft,
2585                  * but it would require division in fib gc, that it
2586                  * not good.
2587                  */
2588                 if (HZ > USER_HZ)
2589                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2590                 else
2591                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2592
2593                 if (addrconf_finite_timeout(rt_expires))
2594                         rt_expires *= HZ;
2595
2596                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2597                                                pinfo->prefix_len,
2598                                                dev,
2599                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2600                                                RTF_GATEWAY | RTF_DEFAULT);
2601
2602                 if (rt) {
2603                         /* Autoconf prefix route */
2604                         if (valid_lft == 0) {
2605                                 ip6_del_rt(rt);
2606                                 rt = NULL;
2607                         } else if (addrconf_finite_timeout(rt_expires)) {
2608                                 /* not infinity */
2609                                 rt6_set_expires(rt, jiffies + rt_expires);
2610                         } else {
2611                                 rt6_clean_expires(rt);
2612                         }
2613                 } else if (valid_lft) {
2614                         clock_t expires = 0;
2615                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2616                         if (addrconf_finite_timeout(rt_expires)) {
2617                                 /* not infinity */
2618                                 flags |= RTF_EXPIRES;
2619                                 expires = jiffies_to_clock_t(rt_expires);
2620                         }
2621                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2622                                               dev, expires, flags);
2623                 }
2624                 ip6_rt_put(rt);
2625         }
2626
2627         /* Try to figure out our local address for this prefix */
2628
2629         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2630                 struct in6_addr addr;
2631                 bool tokenized = false, dev_addr_generated = false;
2632
2633                 if (pinfo->prefix_len == 64) {
2634                         memcpy(&addr, &pinfo->prefix, 8);
2635
2636                         if (!ipv6_addr_any(&in6_dev->token)) {
2637                                 read_lock_bh(&in6_dev->lock);
2638                                 memcpy(addr.s6_addr + 8,
2639                                        in6_dev->token.s6_addr + 8, 8);
2640                                 read_unlock_bh(&in6_dev->lock);
2641                                 tokenized = true;
2642                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2643                                    !ipv6_generate_stable_address(&addr, 0,
2644                                                                  in6_dev)) {
2645                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2646                                 goto ok;
2647                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2648                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2649                                 goto put;
2650                         } else {
2651                                 dev_addr_generated = true;
2652                         }
2653                         goto ok;
2654                 }
2655                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2656                                     pinfo->prefix_len);
2657                 goto put;
2658
2659 ok:
2660                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2661                                                    &addr, addr_type,
2662                                                    addr_flags, sllao,
2663                                                    tokenized, valid_lft,
2664                                                    prefered_lft);
2665                 if (err)
2666                         goto put;
2667
2668                 /* Ignore error case here because previous prefix add addr was
2669                  * successful which will be notified.
2670                  */
2671                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2672                                               addr_type, addr_flags, sllao,
2673                                               tokenized, valid_lft,
2674                                               prefered_lft,
2675                                               dev_addr_generated);
2676         }
2677         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2678 put:
2679         in6_dev_put(in6_dev);
2680 }
2681
2682 /*
2683  *      Set destination address.
2684  *      Special case for SIT interfaces where we create a new "virtual"
2685  *      device.
2686  */
2687 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2688 {
2689         struct in6_ifreq ireq;
2690         struct net_device *dev;
2691         int err = -EINVAL;
2692
2693         rtnl_lock();
2694
2695         err = -EFAULT;
2696         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2697                 goto err_exit;
2698
2699         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2700
2701         err = -ENODEV;
2702         if (!dev)
2703                 goto err_exit;
2704
2705 #if IS_ENABLED(CONFIG_IPV6_SIT)
2706         if (dev->type == ARPHRD_SIT) {
2707                 const struct net_device_ops *ops = dev->netdev_ops;
2708                 struct ifreq ifr;
2709                 struct ip_tunnel_parm p;
2710
2711                 err = -EADDRNOTAVAIL;
2712                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2713                         goto err_exit;
2714
2715                 memset(&p, 0, sizeof(p));
2716                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2717                 p.iph.saddr = 0;
2718                 p.iph.version = 4;
2719                 p.iph.ihl = 5;
2720                 p.iph.protocol = IPPROTO_IPV6;
2721                 p.iph.ttl = 64;
2722                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2723
2724                 if (ops->ndo_do_ioctl) {
2725                         mm_segment_t oldfs = get_fs();
2726
2727                         set_fs(KERNEL_DS);
2728                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2729                         set_fs(oldfs);
2730                 } else
2731                         err = -EOPNOTSUPP;
2732
2733                 if (err == 0) {
2734                         err = -ENOBUFS;
2735                         dev = __dev_get_by_name(net, p.name);
2736                         if (!dev)
2737                                 goto err_exit;
2738                         err = dev_open(dev);
2739                 }
2740         }
2741 #endif
2742
2743 err_exit:
2744         rtnl_unlock();
2745         return err;
2746 }
2747
2748 static int ipv6_mc_config(struct sock *sk, bool join,
2749                           const struct in6_addr *addr, int ifindex)
2750 {
2751         int ret;
2752
2753         ASSERT_RTNL();
2754
2755         lock_sock(sk);
2756         if (join)
2757                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2758         else
2759                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2760         release_sock(sk);
2761
2762         return ret;
2763 }
2764
2765 /*
2766  *      Manual configuration of address on an interface
2767  */
2768 static int inet6_addr_add(struct net *net, int ifindex,
2769                           const struct in6_addr *pfx,
2770                           const struct in6_addr *peer_pfx,
2771                           unsigned int plen, __u32 ifa_flags,
2772                           __u32 prefered_lft, __u32 valid_lft)
2773 {
2774         struct inet6_ifaddr *ifp;
2775         struct inet6_dev *idev;
2776         struct net_device *dev;
2777         unsigned long timeout;
2778         clock_t expires;
2779         int scope;
2780         u32 flags;
2781
2782         ASSERT_RTNL();
2783
2784         if (plen > 128)
2785                 return -EINVAL;
2786
2787         /* check the lifetime */
2788         if (!valid_lft || prefered_lft > valid_lft)
2789                 return -EINVAL;
2790
2791         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2792                 return -EINVAL;
2793
2794         dev = __dev_get_by_index(net, ifindex);
2795         if (!dev)
2796                 return -ENODEV;
2797
2798         idev = addrconf_add_dev(dev);
2799         if (IS_ERR(idev))
2800                 return PTR_ERR(idev);
2801
2802         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2803                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2804                                          true, pfx, ifindex);
2805
2806                 if (ret < 0)
2807                         return ret;
2808         }
2809
2810         scope = ipv6_addr_scope(pfx);
2811
2812         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2813         if (addrconf_finite_timeout(timeout)) {
2814                 expires = jiffies_to_clock_t(timeout * HZ);
2815                 valid_lft = timeout;
2816                 flags = RTF_EXPIRES;
2817         } else {
2818                 expires = 0;
2819                 flags = 0;
2820                 ifa_flags |= IFA_F_PERMANENT;
2821         }
2822
2823         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2824         if (addrconf_finite_timeout(timeout)) {
2825                 if (timeout == 0)
2826                         ifa_flags |= IFA_F_DEPRECATED;
2827                 prefered_lft = timeout;
2828         }
2829
2830         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2831                             valid_lft, prefered_lft);
2832
2833         if (!IS_ERR(ifp)) {
2834                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2835                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2836                                               expires, flags);
2837                 }
2838
2839                 /*
2840                  * Note that section 3.1 of RFC 4429 indicates
2841                  * that the Optimistic flag should not be set for
2842                  * manually configured addresses
2843                  */
2844                 addrconf_dad_start(ifp);
2845                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2846                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2847                                          true, jiffies);
2848                 in6_ifa_put(ifp);
2849                 addrconf_verify_rtnl();
2850                 return 0;
2851         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2852                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2853                                false, pfx, ifindex);
2854         }
2855
2856         return PTR_ERR(ifp);
2857 }
2858
2859 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2860                           const struct in6_addr *pfx, unsigned int plen)
2861 {
2862         struct inet6_ifaddr *ifp;
2863         struct inet6_dev *idev;
2864         struct net_device *dev;
2865
2866         if (plen > 128)
2867                 return -EINVAL;
2868
2869         dev = __dev_get_by_index(net, ifindex);
2870         if (!dev)
2871                 return -ENODEV;
2872
2873         idev = __in6_dev_get(dev);
2874         if (!idev)
2875                 return -ENXIO;
2876
2877         read_lock_bh(&idev->lock);
2878         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2879                 if (ifp->prefix_len == plen &&
2880                     ipv6_addr_equal(pfx, &ifp->addr)) {
2881                         in6_ifa_hold(ifp);
2882                         read_unlock_bh(&idev->lock);
2883
2884                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2885                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2886                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2887                                                  jiffies);
2888                         ipv6_del_addr(ifp);
2889                         addrconf_verify_rtnl();
2890                         if (ipv6_addr_is_multicast(pfx)) {
2891                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2892                                                false, pfx, dev->ifindex);
2893                         }
2894                         return 0;
2895                 }
2896         }
2897         read_unlock_bh(&idev->lock);
2898         return -EADDRNOTAVAIL;
2899 }
2900
2901
2902 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2903 {
2904         struct in6_ifreq ireq;
2905         int err;
2906
2907         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2908                 return -EPERM;
2909
2910         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2911                 return -EFAULT;
2912
2913         rtnl_lock();
2914         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2915                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2916                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2917         rtnl_unlock();
2918         return err;
2919 }
2920
2921 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2922 {
2923         struct in6_ifreq ireq;
2924         int err;
2925
2926         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2927                 return -EPERM;
2928
2929         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2930                 return -EFAULT;
2931
2932         rtnl_lock();
2933         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2934                              ireq.ifr6_prefixlen);
2935         rtnl_unlock();
2936         return err;
2937 }
2938
2939 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2940                      int plen, int scope)
2941 {
2942         struct inet6_ifaddr *ifp;
2943
2944         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2945                             scope, IFA_F_PERMANENT,
2946                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2947         if (!IS_ERR(ifp)) {
2948                 spin_lock_bh(&ifp->lock);
2949                 ifp->flags &= ~IFA_F_TENTATIVE;
2950                 spin_unlock_bh(&ifp->lock);
2951                 rt_genid_bump_ipv6(dev_net(idev->dev));
2952                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2953                 in6_ifa_put(ifp);
2954         }
2955 }
2956
2957 #if IS_ENABLED(CONFIG_IPV6_SIT)
2958 static void sit_add_v4_addrs(struct inet6_dev *idev)
2959 {
2960         struct in6_addr addr;
2961         struct net_device *dev;
2962         struct net *net = dev_net(idev->dev);
2963         int scope, plen;
2964         u32 pflags = 0;
2965
2966         ASSERT_RTNL();
2967
2968         memset(&addr, 0, sizeof(struct in6_addr));
2969         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2970
2971         if (idev->dev->flags&IFF_POINTOPOINT) {
2972                 addr.s6_addr32[0] = htonl(0xfe800000);
2973                 scope = IFA_LINK;
2974                 plen = 64;
2975         } else {
2976                 scope = IPV6_ADDR_COMPATv4;
2977                 plen = 96;
2978                 pflags |= RTF_NONEXTHOP;
2979         }
2980
2981         if (addr.s6_addr32[3]) {
2982                 add_addr(idev, &addr, plen, scope);
2983                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2984                 return;
2985         }
2986
2987         for_each_netdev(net, dev) {
2988                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2989                 if (in_dev && (dev->flags & IFF_UP)) {
2990                         struct in_ifaddr *ifa;
2991
2992                         int flag = scope;
2993
2994                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2995
2996                                 addr.s6_addr32[3] = ifa->ifa_local;
2997
2998                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2999                                         continue;
3000                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3001                                         if (idev->dev->flags&IFF_POINTOPOINT)
3002                                                 continue;
3003                                         flag |= IFA_HOST;
3004                                 }
3005
3006                                 add_addr(idev, &addr, plen, flag);
3007                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3008                                                       pflags);
3009                         }
3010                 }
3011         }
3012 }
3013 #endif
3014
3015 static void init_loopback(struct net_device *dev)
3016 {
3017         struct inet6_dev  *idev;
3018         struct net_device *sp_dev;
3019         struct inet6_ifaddr *sp_ifa;
3020         struct rt6_info *sp_rt;
3021
3022         /* ::1 */
3023
3024         ASSERT_RTNL();
3025
3026         idev = ipv6_find_idev(dev);
3027         if (!idev) {
3028                 pr_debug("%s: add_dev failed\n", __func__);
3029                 return;
3030         }
3031
3032         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3033
3034         /* Add routes to other interface's IPv6 addresses */
3035         for_each_netdev(dev_net(dev), sp_dev) {
3036                 if (!strcmp(sp_dev->name, dev->name))
3037                         continue;
3038
3039                 idev = __in6_dev_get(sp_dev);
3040                 if (!idev)
3041                         continue;
3042
3043                 read_lock_bh(&idev->lock);
3044                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3045
3046                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3047                                 continue;
3048
3049                         if (sp_ifa->rt) {
3050                                 /* This dst has been added to garbage list when
3051                                  * lo device down, release this obsolete dst and
3052                                  * reallocate a new router for ifa.
3053                                  */
3054                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3055                                         ip6_rt_put(sp_ifa->rt);
3056                                         sp_ifa->rt = NULL;
3057                                 } else {
3058                                         continue;
3059                                 }
3060                         }
3061
3062                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3063
3064                         /* Failure cases are ignored */
3065                         if (!IS_ERR(sp_rt)) {
3066                                 sp_ifa->rt = sp_rt;
3067                                 ip6_ins_rt(sp_rt);
3068                         }
3069                 }
3070                 read_unlock_bh(&idev->lock);
3071         }
3072 }
3073
3074 void addrconf_add_linklocal(struct inet6_dev *idev,
3075                             const struct in6_addr *addr, u32 flags)
3076 {
3077         struct inet6_ifaddr *ifp;
3078         u32 addr_flags = flags | IFA_F_PERMANENT;
3079
3080 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3081         if (idev->cnf.optimistic_dad &&
3082             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3083                 addr_flags |= IFA_F_OPTIMISTIC;
3084 #endif
3085
3086         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3087                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3088         if (!IS_ERR(ifp)) {
3089                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3090                 addrconf_dad_start(ifp);
3091                 in6_ifa_put(ifp);
3092         }
3093 }
3094 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3095
3096 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3097 {
3098         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3099                 return true;
3100
3101         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3102             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3103                 return true;
3104
3105         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3106             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3107                 return true;
3108
3109         return false;
3110 }
3111
3112 static int ipv6_generate_stable_address(struct in6_addr *address,
3113                                         u8 dad_count,
3114                                         const struct inet6_dev *idev)
3115 {
3116         static DEFINE_SPINLOCK(lock);
3117         static __u32 digest[SHA_DIGEST_WORDS];
3118         static __u32 workspace[SHA_WORKSPACE_WORDS];
3119
3120         static union {
3121                 char __data[SHA_MESSAGE_BYTES];
3122                 struct {
3123                         struct in6_addr secret;
3124                         __be32 prefix[2];
3125                         unsigned char hwaddr[MAX_ADDR_LEN];
3126                         u8 dad_count;
3127                 } __packed;
3128         } data;
3129
3130         struct in6_addr secret;
3131         struct in6_addr temp;
3132         struct net *net = dev_net(idev->dev);
3133
3134         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3135
3136         if (idev->cnf.stable_secret.initialized)
3137                 secret = idev->cnf.stable_secret.secret;
3138         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3139                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3140         else
3141                 return -1;
3142
3143 retry:
3144         spin_lock_bh(&lock);
3145
3146         sha_init(digest);
3147         memset(&data, 0, sizeof(data));
3148         memset(workspace, 0, sizeof(workspace));
3149         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3150         data.prefix[0] = address->s6_addr32[0];
3151         data.prefix[1] = address->s6_addr32[1];
3152         data.secret = secret;
3153         data.dad_count = dad_count;
3154
3155         sha_transform(digest, data.__data, workspace);
3156
3157         temp = *address;
3158         temp.s6_addr32[2] = (__force __be32)digest[0];
3159         temp.s6_addr32[3] = (__force __be32)digest[1];
3160
3161         spin_unlock_bh(&lock);
3162
3163         if (ipv6_reserved_interfaceid(temp)) {
3164                 dad_count++;
3165                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3166                         return -1;
3167                 goto retry;
3168         }
3169
3170         *address = temp;
3171         return 0;
3172 }
3173
3174 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3175 {
3176         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3177
3178         if (s->initialized)
3179                 return;
3180         s = &idev->cnf.stable_secret;
3181         get_random_bytes(&s->secret, sizeof(s->secret));
3182         s->initialized = true;
3183 }
3184
3185 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3186 {
3187         struct in6_addr addr;
3188
3189         /* no link local addresses on L3 master devices */
3190         if (netif_is_l3_master(idev->dev))
3191                 return;
3192
3193         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3194
3195         switch (idev->cnf.addr_gen_mode) {
3196         case IN6_ADDR_GEN_MODE_RANDOM:
3197                 ipv6_gen_mode_random_init(idev);
3198                 /* fallthrough */
3199         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3200                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3201                         addrconf_add_linklocal(idev, &addr,
3202                                                IFA_F_STABLE_PRIVACY);
3203                 else if (prefix_route)
3204                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3205                 break;
3206         case IN6_ADDR_GEN_MODE_EUI64:
3207                 /* addrconf_add_linklocal also adds a prefix_route and we
3208                  * only need to care about prefix routes if ipv6_generate_eui64
3209                  * couldn't generate one.
3210                  */
3211                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3212                         addrconf_add_linklocal(idev, &addr, 0);
3213                 else if (prefix_route)
3214                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3215                 break;
3216         case IN6_ADDR_GEN_MODE_NONE:
3217         default:
3218                 /* will not add any link local address */
3219                 break;
3220         }
3221 }
3222
3223 static void addrconf_dev_config(struct net_device *dev)
3224 {
3225         struct inet6_dev *idev;
3226
3227         ASSERT_RTNL();
3228
3229         if ((dev->type != ARPHRD_ETHER) &&
3230             (dev->type != ARPHRD_FDDI) &&
3231             (dev->type != ARPHRD_ARCNET) &&
3232             (dev->type != ARPHRD_INFINIBAND) &&
3233             (dev->type != ARPHRD_IEEE1394) &&
3234             (dev->type != ARPHRD_TUNNEL6) &&
3235             (dev->type != ARPHRD_6LOWPAN) &&
3236             (dev->type != ARPHRD_IP6GRE) &&
3237             (dev->type != ARPHRD_IPGRE) &&
3238             (dev->type != ARPHRD_TUNNEL) &&
3239             (dev->type != ARPHRD_NONE)) {
3240                 /* Alas, we support only Ethernet autoconfiguration. */
3241                 return;
3242         }
3243
3244         idev = addrconf_add_dev(dev);
3245         if (IS_ERR(idev))
3246                 return;
3247
3248         /* this device type has no EUI support */
3249         if (dev->type == ARPHRD_NONE &&
3250             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3251                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3252
3253         addrconf_addr_gen(idev, false);
3254 }
3255
3256 #if IS_ENABLED(CONFIG_IPV6_SIT)
3257 static void addrconf_sit_config(struct net_device *dev)
3258 {
3259         struct inet6_dev *idev;
3260
3261         ASSERT_RTNL();
3262
3263         /*
3264          * Configure the tunnel with one of our IPv4
3265          * addresses... we should configure all of
3266          * our v4 addrs in the tunnel
3267          */
3268
3269         idev = ipv6_find_idev(dev);
3270         if (!idev) {
3271                 pr_debug("%s: add_dev failed\n", __func__);
3272                 return;
3273         }
3274
3275         if (dev->priv_flags & IFF_ISATAP) {
3276                 addrconf_addr_gen(idev, false);
3277                 return;
3278         }
3279
3280         sit_add_v4_addrs(idev);
3281
3282         if (dev->flags&IFF_POINTOPOINT)
3283                 addrconf_add_mroute(dev);
3284 }
3285 #endif
3286
3287 #if IS_ENABLED(CONFIG_NET_IPGRE)
3288 static void addrconf_gre_config(struct net_device *dev)
3289 {
3290         struct inet6_dev *idev;
3291
3292         ASSERT_RTNL();
3293
3294         idev = ipv6_find_idev(dev);
3295         if (!idev) {
3296                 pr_debug("%s: add_dev failed\n", __func__);
3297                 return;
3298         }
3299
3300         addrconf_addr_gen(idev, true);
3301         if (dev->flags & IFF_POINTOPOINT)
3302                 addrconf_add_mroute(dev);
3303 }
3304 #endif
3305
3306 static int fixup_permanent_addr(struct inet6_dev *idev,
3307                                 struct inet6_ifaddr *ifp)
3308 {
3309         /* rt6i_ref == 0 means the host route was removed from the
3310          * FIB, for example, if 'lo' device is taken down. In that
3311          * case regenerate the host route.
3312          */
3313         if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) {
3314                 struct rt6_info *rt, *prev;
3315
3316                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3317                 if (unlikely(IS_ERR(rt)))
3318                         return PTR_ERR(rt);
3319
3320                 /* ifp->rt can be accessed outside of rtnl */
3321                 spin_lock(&ifp->lock);
3322                 prev = ifp->rt;
3323                 ifp->rt = rt;
3324                 spin_unlock(&ifp->lock);
3325
3326                 ip6_rt_put(prev);
3327         }
3328
3329         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3330                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3331                                       idev->dev, 0, 0);
3332         }
3333
3334         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3335                 addrconf_dad_start(ifp);
3336
3337         return 0;
3338 }
3339
3340 static void addrconf_permanent_addr(struct net_device *dev)
3341 {
3342         struct inet6_ifaddr *ifp, *tmp;
3343         struct inet6_dev *idev;
3344
3345         idev = __in6_dev_get(dev);
3346         if (!idev)
3347                 return;
3348
3349         write_lock_bh(&idev->lock);
3350
3351         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3352                 if ((ifp->flags & IFA_F_PERMANENT) &&
3353                     fixup_permanent_addr(idev, ifp) < 0) {
3354                         write_unlock_bh(&idev->lock);
3355                         ipv6_del_addr(ifp);
3356                         write_lock_bh(&idev->lock);
3357
3358                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3359                                              idev->dev->name, &ifp->addr);
3360                 }
3361         }
3362
3363         write_unlock_bh(&idev->lock);
3364 }
3365
3366 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3367                            void *ptr)
3368 {
3369         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3370         struct netdev_notifier_changeupper_info *info;
3371         struct inet6_dev *idev = __in6_dev_get(dev);
3372         int run_pending = 0;
3373         int err;
3374
3375         switch (event) {
3376         case NETDEV_REGISTER:
3377                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3378                         idev = ipv6_add_dev(dev);
3379                         if (IS_ERR(idev))
3380                                 return notifier_from_errno(PTR_ERR(idev));
3381                 }
3382                 break;
3383
3384         case NETDEV_CHANGEMTU:
3385                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3386                 if (dev->mtu < IPV6_MIN_MTU) {
3387                         addrconf_ifdown(dev, 1);
3388                         break;
3389                 }
3390
3391                 if (idev) {
3392                         rt6_mtu_change(dev, dev->mtu);
3393                         idev->cnf.mtu6 = dev->mtu;
3394                         break;
3395                 }
3396
3397                 /* allocate new idev */
3398                 idev = ipv6_add_dev(dev);
3399                 if (IS_ERR(idev))
3400                         break;
3401
3402                 /* device is still not ready */
3403                 if (!(idev->if_flags & IF_READY))
3404                         break;
3405
3406                 run_pending = 1;
3407
3408                 /* fall through */
3409
3410         case NETDEV_UP:
3411         case NETDEV_CHANGE:
3412                 if (dev->flags & IFF_SLAVE)
3413                         break;
3414
3415                 if (idev && idev->cnf.disable_ipv6)
3416                         break;
3417
3418                 if (event == NETDEV_UP) {
3419                         /* restore routes for permanent addresses */
3420                         addrconf_permanent_addr(dev);
3421
3422                         if (!addrconf_qdisc_ok(dev)) {
3423                                 /* device is not ready yet. */
3424                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3425                                         dev->name);
3426                                 break;
3427                         }
3428
3429                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3430                                 idev = ipv6_add_dev(dev);
3431
3432                         if (!IS_ERR_OR_NULL(idev)) {
3433                                 idev->if_flags |= IF_READY;
3434                                 run_pending = 1;
3435                         }
3436                 } else if (event == NETDEV_CHANGE) {
3437                         if (!addrconf_qdisc_ok(dev)) {
3438                                 /* device is still not ready. */
3439                                 break;
3440                         }
3441
3442                         if (idev) {
3443                                 if (idev->if_flags & IF_READY) {
3444                                         /* device is already configured -
3445                                          * but resend MLD reports, we might
3446                                          * have roamed and need to update
3447                                          * multicast snooping switches
3448                                          */
3449                                         ipv6_mc_up(idev);
3450                                         break;
3451                                 }
3452                                 idev->if_flags |= IF_READY;
3453                         }
3454
3455                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3456                                 dev->name);
3457
3458                         run_pending = 1;
3459                 }
3460
3461                 switch (dev->type) {
3462 #if IS_ENABLED(CONFIG_IPV6_SIT)
3463                 case ARPHRD_SIT:
3464                         addrconf_sit_config(dev);
3465                         break;
3466 #endif
3467 #if IS_ENABLED(CONFIG_NET_IPGRE)
3468                 case ARPHRD_IPGRE:
3469                         addrconf_gre_config(dev);
3470                         break;
3471 #endif
3472                 case ARPHRD_LOOPBACK:
3473                         init_loopback(dev);
3474                         break;
3475
3476                 default:
3477                         addrconf_dev_config(dev);
3478                         break;
3479                 }
3480
3481                 if (!IS_ERR_OR_NULL(idev)) {
3482                         if (run_pending)
3483                                 addrconf_dad_run(idev);
3484
3485                         /*
3486                          * If the MTU changed during the interface down,
3487                          * when the interface up, the changed MTU must be
3488                          * reflected in the idev as well as routers.
3489                          */
3490                         if (idev->cnf.mtu6 != dev->mtu &&
3491                             dev->mtu >= IPV6_MIN_MTU) {
3492                                 rt6_mtu_change(dev, dev->mtu);
3493                                 idev->cnf.mtu6 = dev->mtu;
3494                         }
3495                         idev->tstamp = jiffies;
3496                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3497
3498                         /*
3499                          * If the changed mtu during down is lower than
3500                          * IPV6_MIN_MTU stop IPv6 on this interface.
3501                          */
3502                         if (dev->mtu < IPV6_MIN_MTU)
3503                                 addrconf_ifdown(dev, 1);
3504                 }
3505                 break;
3506
3507         case NETDEV_DOWN:
3508         case NETDEV_UNREGISTER:
3509                 /*
3510                  *      Remove all addresses from this interface.
3511                  */
3512                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3513                 break;
3514
3515         case NETDEV_CHANGENAME:
3516                 if (idev) {
3517                         snmp6_unregister_dev(idev);
3518                         addrconf_sysctl_unregister(idev);
3519                         err = addrconf_sysctl_register(idev);
3520                         if (err)
3521                                 return notifier_from_errno(err);
3522                         err = snmp6_register_dev(idev);
3523                         if (err) {
3524                                 addrconf_sysctl_unregister(idev);
3525                                 return notifier_from_errno(err);
3526                         }
3527                 }
3528                 break;
3529
3530         case NETDEV_PRE_TYPE_CHANGE:
3531         case NETDEV_POST_TYPE_CHANGE:
3532                 if (idev)
3533                         addrconf_type_change(dev, event);
3534                 break;
3535
3536         case NETDEV_CHANGEUPPER:
3537                 info = ptr;
3538
3539                 /* flush all routes if dev is linked to or unlinked from
3540                  * an L3 master device (e.g., VRF)
3541                  */
3542                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3543                         addrconf_ifdown(dev, 0);
3544         }
3545
3546         return NOTIFY_OK;
3547 }
3548
3549 /*
3550  *      addrconf module should be notified of a device going up
3551  */
3552 static struct notifier_block ipv6_dev_notf = {
3553         .notifier_call = addrconf_notify,
3554         .priority = ADDRCONF_NOTIFY_PRIORITY,
3555 };
3556
3557 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3558 {
3559         struct inet6_dev *idev;
3560         ASSERT_RTNL();
3561
3562         idev = __in6_dev_get(dev);
3563
3564         if (event == NETDEV_POST_TYPE_CHANGE)
3565                 ipv6_mc_remap(idev);
3566         else if (event == NETDEV_PRE_TYPE_CHANGE)
3567                 ipv6_mc_unmap(idev);
3568 }
3569
3570 static bool addr_is_local(const struct in6_addr *addr)
3571 {
3572         return ipv6_addr_type(addr) &
3573                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3574 }
3575
3576 static int addrconf_ifdown(struct net_device *dev, int how)
3577 {
3578         struct net *net = dev_net(dev);
3579         struct inet6_dev *idev;
3580         struct inet6_ifaddr *ifa, *tmp;
3581         struct list_head del_list;
3582         int _keep_addr;
3583         bool keep_addr;
3584         int state, i;
3585
3586         ASSERT_RTNL();
3587
3588         rt6_ifdown(net, dev);
3589         neigh_ifdown(&nd_tbl, dev);
3590
3591         idev = __in6_dev_get(dev);
3592         if (!idev)
3593                 return -ENODEV;
3594
3595         /*
3596          * Step 1: remove reference to ipv6 device from parent device.
3597          *         Do not dev_put!
3598          */
3599         if (how) {
3600                 idev->dead = 1;
3601
3602                 /* protected by rtnl_lock */
3603                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3604
3605                 /* Step 1.5: remove snmp6 entry */
3606                 snmp6_unregister_dev(idev);
3607
3608         }
3609
3610         /* aggregate the system setting and interface setting */
3611         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3612         if (!_keep_addr)
3613                 _keep_addr = idev->cnf.keep_addr_on_down;
3614
3615         /* combine the user config with event to determine if permanent
3616          * addresses are to be removed from address hash table
3617          */
3618         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3619
3620         /* Step 2: clear hash table */
3621         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3622                 struct hlist_head *h = &inet6_addr_lst[i];
3623
3624                 spin_lock_bh(&addrconf_hash_lock);
3625 restart:
3626                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3627                         if (ifa->idev == idev) {
3628                                 addrconf_del_dad_work(ifa);
3629                                 /* combined flag + permanent flag decide if
3630                                  * address is retained on a down event
3631                                  */
3632                                 if (!keep_addr ||
3633                                     !(ifa->flags & IFA_F_PERMANENT) ||
3634                                     addr_is_local(&ifa->addr)) {
3635                                         hlist_del_init_rcu(&ifa->addr_lst);
3636                                         goto restart;
3637                                 }
3638                         }
3639                 }
3640                 spin_unlock_bh(&addrconf_hash_lock);
3641         }
3642
3643         write_lock_bh(&idev->lock);
3644
3645         addrconf_del_rs_timer(idev);
3646
3647         /* Step 2: clear flags for stateless addrconf */
3648         if (!how)
3649                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3650
3651         /* Step 3: clear tempaddr list */
3652         while (!list_empty(&idev->tempaddr_list)) {
3653                 ifa = list_first_entry(&idev->tempaddr_list,
3654                                        struct inet6_ifaddr, tmp_list);
3655                 list_del(&ifa->tmp_list);
3656                 write_unlock_bh(&idev->lock);
3657                 spin_lock_bh(&ifa->lock);
3658
3659                 if (ifa->ifpub) {
3660                         in6_ifa_put(ifa->ifpub);
3661                         ifa->ifpub = NULL;
3662                 }
3663                 spin_unlock_bh(&ifa->lock);
3664                 in6_ifa_put(ifa);
3665                 write_lock_bh(&idev->lock);
3666         }
3667
3668         /* re-combine the user config with event to determine if permanent
3669          * addresses are to be removed from the interface list
3670          */
3671         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3672
3673         INIT_LIST_HEAD(&del_list);
3674         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3675                 struct rt6_info *rt = NULL;
3676                 bool keep;
3677
3678                 addrconf_del_dad_work(ifa);
3679
3680                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3681                         !addr_is_local(&ifa->addr);
3682                 if (!keep)
3683                         list_move(&ifa->if_list, &del_list);
3684
3685                 write_unlock_bh(&idev->lock);
3686                 spin_lock_bh(&ifa->lock);
3687
3688                 if (keep) {
3689                         /* set state to skip the notifier below */
3690                         state = INET6_IFADDR_STATE_DEAD;
3691                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3692                         if (!(ifa->flags & IFA_F_NODAD))
3693                                 ifa->flags |= IFA_F_TENTATIVE;
3694
3695                         rt = ifa->rt;
3696                         ifa->rt = NULL;
3697                 } else {
3698                         state = ifa->state;
3699                         ifa->state = INET6_IFADDR_STATE_DEAD;
3700                 }
3701
3702                 spin_unlock_bh(&ifa->lock);
3703
3704                 if (rt)
3705                         ip6_del_rt(rt);
3706
3707                 if (state != INET6_IFADDR_STATE_DEAD) {
3708                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3709                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3710                 } else {
3711                         if (idev->cnf.forwarding)
3712                                 addrconf_leave_anycast(ifa);
3713                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3714                 }
3715
3716                 write_lock_bh(&idev->lock);
3717         }
3718
3719         write_unlock_bh(&idev->lock);
3720
3721         /* now clean up addresses to be removed */
3722         while (!list_empty(&del_list)) {
3723                 ifa = list_first_entry(&del_list,
3724                                        struct inet6_ifaddr, if_list);
3725                 list_del(&ifa->if_list);
3726
3727                 in6_ifa_put(ifa);
3728         }
3729
3730         /* Step 5: Discard anycast and multicast list */
3731         if (how) {
3732                 ipv6_ac_destroy_dev(idev);
3733                 ipv6_mc_destroy_dev(idev);
3734         } else {
3735                 ipv6_mc_down(idev);
3736         }
3737
3738         idev->tstamp = jiffies;
3739
3740         /* Last: Shot the device (if unregistered) */
3741         if (how) {
3742                 addrconf_sysctl_unregister(idev);
3743                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3744                 neigh_ifdown(&nd_tbl, dev);
3745                 in6_dev_put(idev);
3746         }
3747         return 0;
3748 }
3749
3750 static void addrconf_rs_timer(unsigned long data)
3751 {
3752         struct inet6_dev *idev = (struct inet6_dev *)data;
3753         struct net_device *dev = idev->dev;
3754         struct in6_addr lladdr;
3755
3756         write_lock(&idev->lock);
3757         if (idev->dead || !(idev->if_flags & IF_READY))
3758                 goto out;
3759
3760         if (!ipv6_accept_ra(idev))
3761                 goto out;
3762
3763         /* Announcement received after solicitation was sent */
3764         if (idev->if_flags & IF_RA_RCVD)
3765                 goto out;
3766
3767         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3768                 write_unlock(&idev->lock);
3769                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3770                         ndisc_send_rs(dev, &lladdr,
3771                                       &in6addr_linklocal_allrouters);
3772                 else
3773                         goto put;
3774
3775                 write_lock(&idev->lock);
3776                 idev->rs_interval = rfc3315_s14_backoff_update(
3777                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3778                 /* The wait after the last probe can be shorter */
3779                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3780                                              idev->cnf.rtr_solicits) ?
3781                                       idev->cnf.rtr_solicit_delay :
3782                                       idev->rs_interval);
3783         } else {
3784                 /*
3785                  * Note: we do not support deprecated "all on-link"
3786                  * assumption any longer.
3787                  */
3788                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3789         }
3790
3791 out:
3792         write_unlock(&idev->lock);
3793 put:
3794         in6_dev_put(idev);
3795 }
3796
3797 /*
3798  *      Duplicate Address Detection
3799  */
3800 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3801 {
3802         unsigned long rand_num;
3803         struct inet6_dev *idev = ifp->idev;
3804         u64 nonce;
3805
3806         if (ifp->flags & IFA_F_OPTIMISTIC)
3807                 rand_num = 0;
3808         else
3809                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3810
3811         nonce = 0;
3812         if (idev->cnf.enhanced_dad ||
3813             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3814                 do
3815                         get_random_bytes(&nonce, 6);
3816                 while (nonce == 0);
3817         }
3818         ifp->dad_nonce = nonce;
3819         ifp->dad_probes = idev->cnf.dad_transmits;
3820         addrconf_mod_dad_work(ifp, rand_num);
3821 }
3822
3823 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3824 {
3825         struct inet6_dev *idev = ifp->idev;
3826         struct net_device *dev = idev->dev;
3827         bool bump_id, notify = false;
3828
3829         addrconf_join_solict(dev, &ifp->addr);
3830
3831         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3832
3833         read_lock_bh(&idev->lock);
3834         spin_lock(&ifp->lock);
3835         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3836                 goto out;
3837
3838         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3839             idev->cnf.accept_dad < 1 ||
3840             !(ifp->flags&IFA_F_TENTATIVE) ||
3841             ifp->flags & IFA_F_NODAD) {
3842                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3843                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3844                 spin_unlock(&ifp->lock);
3845                 read_unlock_bh(&idev->lock);
3846
3847                 addrconf_dad_completed(ifp, bump_id);
3848                 return;
3849         }
3850
3851         if (!(idev->if_flags & IF_READY)) {
3852                 spin_unlock(&ifp->lock);
3853                 read_unlock_bh(&idev->lock);
3854                 /*
3855                  * If the device is not ready:
3856                  * - keep it tentative if it is a permanent address.
3857                  * - otherwise, kill it.
3858                  */
3859                 in6_ifa_hold(ifp);
3860                 addrconf_dad_stop(ifp, 0);
3861                 return;
3862         }
3863
3864         /*
3865          * Optimistic nodes can start receiving
3866          * Frames right away
3867          */
3868         if (ifp->flags & IFA_F_OPTIMISTIC) {
3869                 ip6_ins_rt(ifp->rt);
3870                 if (ipv6_use_optimistic_addr(idev)) {
3871                         /* Because optimistic nodes can use this address,
3872                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3873                          */
3874                         notify = true;
3875                 }
3876         }
3877
3878         addrconf_dad_kick(ifp);
3879 out:
3880         spin_unlock(&ifp->lock);
3881         read_unlock_bh(&idev->lock);
3882         if (notify)
3883                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3884 }
3885
3886 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3887 {
3888         bool begin_dad = false;
3889
3890         spin_lock_bh(&ifp->lock);
3891         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3892                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3893                 begin_dad = true;
3894         }
3895         spin_unlock_bh(&ifp->lock);
3896
3897         if (begin_dad)
3898                 addrconf_mod_dad_work(ifp, 0);
3899 }
3900
3901 static void addrconf_dad_work(struct work_struct *w)
3902 {
3903         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3904                                                 struct inet6_ifaddr,
3905                                                 dad_work);
3906         struct inet6_dev *idev = ifp->idev;
3907         bool bump_id, disable_ipv6 = false;
3908         struct in6_addr mcaddr;
3909
3910         enum {
3911                 DAD_PROCESS,
3912                 DAD_BEGIN,
3913                 DAD_ABORT,
3914         } action = DAD_PROCESS;
3915
3916         rtnl_lock();
3917
3918         spin_lock_bh(&ifp->lock);
3919         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3920                 action = DAD_BEGIN;
3921                 ifp->state = INET6_IFADDR_STATE_DAD;
3922         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3923                 action = DAD_ABORT;
3924                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3925
3926                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3927                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3928                         struct in6_addr addr;
3929
3930                         addr.s6_addr32[0] = htonl(0xfe800000);
3931                         addr.s6_addr32[1] = 0;
3932
3933                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3934                             ipv6_addr_equal(&ifp->addr, &addr)) {
3935                                 /* DAD failed for link-local based on MAC */
3936                                 idev->cnf.disable_ipv6 = 1;
3937
3938                                 pr_info("%s: IPv6 being disabled!\n",
3939                                         ifp->idev->dev->name);
3940                                 disable_ipv6 = true;
3941                         }
3942                 }
3943         }
3944         spin_unlock_bh(&ifp->lock);
3945
3946         if (action == DAD_BEGIN) {
3947                 addrconf_dad_begin(ifp);
3948                 goto out;
3949         } else if (action == DAD_ABORT) {
3950                 in6_ifa_hold(ifp);
3951                 addrconf_dad_stop(ifp, 1);
3952                 if (disable_ipv6)
3953                         addrconf_ifdown(idev->dev, 0);
3954                 goto out;
3955         }
3956
3957         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3958                 goto out;
3959
3960         write_lock_bh(&idev->lock);
3961         if (idev->dead || !(idev->if_flags & IF_READY)) {
3962                 write_unlock_bh(&idev->lock);
3963                 goto out;
3964         }
3965
3966         spin_lock(&ifp->lock);
3967         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3968                 spin_unlock(&ifp->lock);
3969                 write_unlock_bh(&idev->lock);
3970                 goto out;
3971         }
3972
3973         if (ifp->dad_probes == 0) {
3974                 /*
3975                  * DAD was successful
3976                  */
3977
3978                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3979                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3980                 spin_unlock(&ifp->lock);
3981                 write_unlock_bh(&idev->lock);
3982
3983                 addrconf_dad_completed(ifp, bump_id);
3984
3985                 goto out;
3986         }
3987
3988         ifp->dad_probes--;
3989         addrconf_mod_dad_work(ifp,
3990                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3991         spin_unlock(&ifp->lock);
3992         write_unlock_bh(&idev->lock);
3993
3994         /* send a neighbour solicitation for our addr */
3995         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3996         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3997                       ifp->dad_nonce);
3998 out:
3999         in6_ifa_put(ifp);
4000         rtnl_unlock();
4001 }
4002
4003 /* ifp->idev must be at least read locked */
4004 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4005 {
4006         struct inet6_ifaddr *ifpiter;
4007         struct inet6_dev *idev = ifp->idev;
4008
4009         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4010                 if (ifpiter->scope > IFA_LINK)
4011                         break;
4012                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4013                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4014                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4015                     IFA_F_PERMANENT)
4016                         return false;
4017         }
4018         return true;
4019 }
4020
4021 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
4022 {
4023         struct net_device *dev = ifp->idev->dev;
4024         struct in6_addr lladdr;
4025         bool send_rs, send_mld;
4026
4027         addrconf_del_dad_work(ifp);
4028
4029         /*
4030          *      Configure the address for reception. Now it is valid.
4031          */
4032
4033         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4034
4035         /* If added prefix is link local and we are prepared to process
4036            router advertisements, start sending router solicitations.
4037          */
4038
4039         read_lock_bh(&ifp->idev->lock);
4040         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4041         send_rs = send_mld &&
4042                   ipv6_accept_ra(ifp->idev) &&
4043                   ifp->idev->cnf.rtr_solicits != 0 &&
4044                   (dev->flags&IFF_LOOPBACK) == 0;
4045         read_unlock_bh(&ifp->idev->lock);
4046
4047         /* While dad is in progress mld report's source address is in6_addrany.
4048          * Resend with proper ll now.
4049          */
4050         if (send_mld)
4051                 ipv6_mc_dad_complete(ifp->idev);
4052
4053         if (send_rs) {
4054                 /*
4055                  *      If a host as already performed a random delay
4056                  *      [...] as part of DAD [...] there is no need
4057                  *      to delay again before sending the first RS
4058                  */
4059                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4060                         return;
4061                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4062
4063                 write_lock_bh(&ifp->idev->lock);
4064                 spin_lock(&ifp->lock);
4065                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4066                         ifp->idev->cnf.rtr_solicit_interval);
4067                 ifp->idev->rs_probes = 1;
4068                 ifp->idev->if_flags |= IF_RS_SENT;
4069                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4070                 spin_unlock(&ifp->lock);
4071                 write_unlock_bh(&ifp->idev->lock);
4072         }
4073
4074         if (bump_id)
4075                 rt_genid_bump_ipv6(dev_net(dev));
4076
4077         /* Make sure that a new temporary address will be created
4078          * before this temporary address becomes deprecated.
4079          */
4080         if (ifp->flags & IFA_F_TEMPORARY)
4081                 addrconf_verify_rtnl();
4082 }
4083
4084 static void addrconf_dad_run(struct inet6_dev *idev)
4085 {
4086         struct inet6_ifaddr *ifp;
4087
4088         read_lock_bh(&idev->lock);
4089         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4090                 spin_lock(&ifp->lock);
4091                 if (ifp->flags & IFA_F_TENTATIVE &&
4092                     ifp->state == INET6_IFADDR_STATE_DAD)
4093                         addrconf_dad_kick(ifp);
4094                 spin_unlock(&ifp->lock);
4095         }
4096         read_unlock_bh(&idev->lock);
4097 }
4098
4099 #ifdef CONFIG_PROC_FS
4100 struct if6_iter_state {
4101         struct seq_net_private p;
4102         int bucket;
4103         int offset;
4104 };
4105
4106 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4107 {
4108         struct inet6_ifaddr *ifa = NULL;
4109         struct if6_iter_state *state = seq->private;
4110         struct net *net = seq_file_net(seq);
4111         int p = 0;
4112
4113         /* initial bucket if pos is 0 */
4114         if (pos == 0) {
4115                 state->bucket = 0;
4116                 state->offset = 0;
4117         }
4118
4119         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4120                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4121                                          addr_lst) {
4122                         if (!net_eq(dev_net(ifa->idev->dev), net))
4123                                 continue;
4124                         /* sync with offset */
4125                         if (p < state->offset) {
4126                                 p++;
4127                                 continue;
4128                         }
4129                         state->offset++;
4130                         return ifa;
4131                 }
4132
4133                 /* prepare for next bucket */
4134                 state->offset = 0;
4135                 p = 0;
4136         }
4137         return NULL;
4138 }
4139
4140 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4141                                          struct inet6_ifaddr *ifa)
4142 {
4143         struct if6_iter_state *state = seq->private;
4144         struct net *net = seq_file_net(seq);
4145
4146         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4147                 if (!net_eq(dev_net(ifa->idev->dev), net))
4148                         continue;
4149                 state->offset++;
4150                 return ifa;
4151         }
4152
4153         while (++state->bucket < IN6_ADDR_HSIZE) {
4154                 state->offset = 0;
4155                 hlist_for_each_entry_rcu_bh(ifa,
4156                                      &inet6_addr_lst[state->bucket], addr_lst) {
4157                         if (!net_eq(dev_net(ifa->idev->dev), net))
4158                                 continue;
4159                         state->offset++;
4160                         return ifa;
4161                 }
4162         }
4163
4164         return NULL;
4165 }
4166
4167 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4168         __acquires(rcu_bh)
4169 {
4170         rcu_read_lock_bh();
4171         return if6_get_first(seq, *pos);
4172 }
4173
4174 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4175 {
4176         struct inet6_ifaddr *ifa;
4177
4178         ifa = if6_get_next(seq, v);
4179         ++*pos;
4180         return ifa;
4181 }
4182
4183 static void if6_seq_stop(struct seq_file *seq, void *v)
4184         __releases(rcu_bh)
4185 {
4186         rcu_read_unlock_bh();
4187 }
4188
4189 static int if6_seq_show(struct seq_file *seq, void *v)
4190 {
4191         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4192         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4193                    &ifp->addr,
4194                    ifp->idev->dev->ifindex,
4195                    ifp->prefix_len,
4196                    ifp->scope,
4197                    (u8) ifp->flags,
4198                    ifp->idev->dev->name);
4199         return 0;
4200 }
4201
4202 static const struct seq_operations if6_seq_ops = {
4203         .start  = if6_seq_start,
4204         .next   = if6_seq_next,
4205         .show   = if6_seq_show,
4206         .stop   = if6_seq_stop,
4207 };
4208
4209 static int if6_seq_open(struct inode *inode, struct file *file)
4210 {
4211         return seq_open_net(inode, file, &if6_seq_ops,
4212                             sizeof(struct if6_iter_state));
4213 }
4214
4215 static const struct file_operations if6_fops = {
4216         .owner          = THIS_MODULE,
4217         .open           = if6_seq_open,
4218         .read           = seq_read,
4219         .llseek         = seq_lseek,
4220         .release        = seq_release_net,
4221 };
4222
4223 static int __net_init if6_proc_net_init(struct net *net)
4224 {
4225         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4226                 return -ENOMEM;
4227         return 0;
4228 }
4229
4230 static void __net_exit if6_proc_net_exit(struct net *net)
4231 {
4232         remove_proc_entry("if_inet6", net->proc_net);
4233 }
4234
4235 static struct pernet_operations if6_proc_net_ops = {
4236         .init = if6_proc_net_init,
4237         .exit = if6_proc_net_exit,
4238 };
4239
4240 int __init if6_proc_init(void)
4241 {
4242         return register_pernet_subsys(&if6_proc_net_ops);
4243 }
4244
4245 void if6_proc_exit(void)
4246 {
4247         unregister_pernet_subsys(&if6_proc_net_ops);
4248 }
4249 #endif  /* CONFIG_PROC_FS */
4250
4251 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4252 /* Check if address is a home address configured on any interface. */
4253 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4254 {
4255         int ret = 0;
4256         struct inet6_ifaddr *ifp = NULL;
4257         unsigned int hash = inet6_addr_hash(addr);
4258
4259         rcu_read_lock_bh();
4260         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4261                 if (!net_eq(dev_net(ifp->idev->dev), net))
4262                         continue;
4263                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4264                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4265                         ret = 1;
4266                         break;
4267                 }
4268         }
4269         rcu_read_unlock_bh();
4270         return ret;
4271 }
4272 #endif
4273
4274 /*
4275  *      Periodic address status verification
4276  */
4277
4278 static void addrconf_verify_rtnl(void)
4279 {
4280         unsigned long now, next, next_sec, next_sched;
4281         struct inet6_ifaddr *ifp;
4282         int i;
4283
4284         ASSERT_RTNL();
4285
4286         rcu_read_lock_bh();
4287         now = jiffies;
4288         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4289
4290         cancel_delayed_work(&addr_chk_work);
4291
4292         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4293 restart:
4294                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4295                         unsigned long age;
4296
4297                         /* When setting preferred_lft to a value not zero or
4298                          * infinity, while valid_lft is infinity
4299                          * IFA_F_PERMANENT has a non-infinity life time.
4300                          */
4301                         if ((ifp->flags & IFA_F_PERMANENT) &&
4302                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4303                                 continue;
4304
4305                         spin_lock(&ifp->lock);
4306                         /* We try to batch several events at once. */
4307                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4308
4309                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4310                             age >= ifp->valid_lft) {
4311                                 spin_unlock(&ifp->lock);
4312                                 in6_ifa_hold(ifp);
4313                                 ipv6_del_addr(ifp);
4314                                 goto restart;
4315                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4316                                 spin_unlock(&ifp->lock);
4317                                 continue;
4318                         } else if (age >= ifp->prefered_lft) {
4319                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4320                                 int deprecate = 0;
4321
4322                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4323                                         deprecate = 1;
4324                                         ifp->flags |= IFA_F_DEPRECATED;
4325                                 }
4326
4327                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4328                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4329                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4330
4331                                 spin_unlock(&ifp->lock);
4332
4333                                 if (deprecate) {
4334                                         in6_ifa_hold(ifp);
4335
4336                                         ipv6_ifa_notify(0, ifp);
4337                                         in6_ifa_put(ifp);
4338                                         goto restart;
4339                                 }
4340                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4341                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4342                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4343                                         ifp->idev->cnf.dad_transmits *
4344                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4345
4346                                 if (age >= ifp->prefered_lft - regen_advance) {
4347                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4348                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4349                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4350                                         if (!ifp->regen_count && ifpub) {
4351                                                 ifp->regen_count++;
4352                                                 in6_ifa_hold(ifp);
4353                                                 in6_ifa_hold(ifpub);
4354                                                 spin_unlock(&ifp->lock);
4355
4356                                                 spin_lock(&ifpub->lock);
4357                                                 ifpub->regen_count = 0;
4358                                                 spin_unlock(&ifpub->lock);
4359                                                 ipv6_create_tempaddr(ifpub, ifp);
4360                                                 in6_ifa_put(ifpub);
4361                                                 in6_ifa_put(ifp);
4362                                                 goto restart;
4363                                         }
4364                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4365                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4366                                 spin_unlock(&ifp->lock);
4367                         } else {
4368                                 /* ifp->prefered_lft <= ifp->valid_lft */
4369                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4370                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4371                                 spin_unlock(&ifp->lock);
4372                         }
4373                 }
4374         }
4375
4376         next_sec = round_jiffies_up(next);
4377         next_sched = next;
4378
4379         /* If rounded timeout is accurate enough, accept it. */
4380         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4381                 next_sched = next_sec;
4382
4383         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4384         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4385                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4386
4387         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4388               now, next, next_sec, next_sched);
4389         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4390         rcu_read_unlock_bh();
4391 }
4392
4393 static void addrconf_verify_work(struct work_struct *w)
4394 {
4395         rtnl_lock();
4396         addrconf_verify_rtnl();
4397         rtnl_unlock();
4398 }
4399
4400 static void addrconf_verify(void)
4401 {
4402         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4403 }
4404
4405 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4406                                      struct in6_addr **peer_pfx)
4407 {
4408         struct in6_addr *pfx = NULL;
4409
4410         *peer_pfx = NULL;
4411
4412         if (addr)
4413                 pfx = nla_data(addr);
4414
4415         if (local) {
4416                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4417                         *peer_pfx = pfx;
4418                 pfx = nla_data(local);
4419         }
4420
4421         return pfx;
4422 }
4423
4424 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4425         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4426         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4427         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4428         [IFA_FLAGS]             = { .len = sizeof(u32) },
4429 };
4430
4431 static int
4432 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4433                   struct netlink_ext_ack *extack)
4434 {
4435         struct net *net = sock_net(skb->sk);
4436         struct ifaddrmsg *ifm;
4437         struct nlattr *tb[IFA_MAX+1];
4438         struct in6_addr *pfx, *peer_pfx;
4439         u32 ifa_flags;
4440         int err;
4441
4442         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4443                           extack);
4444         if (err < 0)
4445                 return err;
4446
4447         ifm = nlmsg_data(nlh);
4448         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4449         if (!pfx)
4450                 return -EINVAL;
4451
4452         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4453
4454         /* We ignore other flags so far. */
4455         ifa_flags &= IFA_F_MANAGETEMPADDR;
4456
4457         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4458                               ifm->ifa_prefixlen);
4459 }
4460
4461 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4462                              u32 prefered_lft, u32 valid_lft)
4463 {
4464         u32 flags;
4465         clock_t expires;
4466         unsigned long timeout;
4467         bool was_managetempaddr;
4468         bool had_prefixroute;
4469
4470         ASSERT_RTNL();
4471
4472         if (!valid_lft || (prefered_lft > valid_lft))
4473                 return -EINVAL;
4474
4475         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4476             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4477                 return -EINVAL;
4478
4479         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4480         if (addrconf_finite_timeout(timeout)) {
4481                 expires = jiffies_to_clock_t(timeout * HZ);
4482                 valid_lft = timeout;
4483                 flags = RTF_EXPIRES;
4484         } else {
4485                 expires = 0;
4486                 flags = 0;
4487                 ifa_flags |= IFA_F_PERMANENT;
4488         }
4489
4490         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4491         if (addrconf_finite_timeout(timeout)) {
4492                 if (timeout == 0)
4493                         ifa_flags |= IFA_F_DEPRECATED;
4494                 prefered_lft = timeout;
4495         }
4496
4497         spin_lock_bh(&ifp->lock);
4498         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4499         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4500                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4501         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4502                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4503                         IFA_F_NOPREFIXROUTE);
4504         ifp->flags |= ifa_flags;
4505         ifp->tstamp = jiffies;
4506         ifp->valid_lft = valid_lft;
4507         ifp->prefered_lft = prefered_lft;
4508
4509         spin_unlock_bh(&ifp->lock);
4510         if (!(ifp->flags&IFA_F_TENTATIVE))
4511                 ipv6_ifa_notify(0, ifp);
4512
4513         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4514                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4515                                       expires, flags);
4516         } else if (had_prefixroute) {
4517                 enum cleanup_prefix_rt_t action;
4518                 unsigned long rt_expires;
4519
4520                 write_lock_bh(&ifp->idev->lock);
4521                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4522                 write_unlock_bh(&ifp->idev->lock);
4523
4524                 if (action != CLEANUP_PREFIX_RT_NOP) {
4525                         cleanup_prefix_route(ifp, rt_expires,
4526                                 action == CLEANUP_PREFIX_RT_DEL);
4527                 }
4528         }
4529
4530         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4531                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4532                         valid_lft = prefered_lft = 0;
4533                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4534                                  !was_managetempaddr, jiffies);
4535         }
4536
4537         addrconf_verify_rtnl();
4538
4539         return 0;
4540 }
4541
4542 static int
4543 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4544                   struct netlink_ext_ack *extack)
4545 {
4546         struct net *net = sock_net(skb->sk);
4547         struct ifaddrmsg *ifm;
4548         struct nlattr *tb[IFA_MAX+1];
4549         struct in6_addr *pfx, *peer_pfx;
4550         struct inet6_ifaddr *ifa;
4551         struct net_device *dev;
4552         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4553         u32 ifa_flags;
4554         int err;
4555
4556         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4557                           extack);
4558         if (err < 0)
4559                 return err;
4560
4561         ifm = nlmsg_data(nlh);
4562         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4563         if (!pfx)
4564                 return -EINVAL;
4565
4566         if (tb[IFA_CACHEINFO]) {
4567                 struct ifa_cacheinfo *ci;
4568
4569                 ci = nla_data(tb[IFA_CACHEINFO]);
4570                 valid_lft = ci->ifa_valid;
4571                 preferred_lft = ci->ifa_prefered;
4572         } else {
4573                 preferred_lft = INFINITY_LIFE_TIME;
4574                 valid_lft = INFINITY_LIFE_TIME;
4575         }
4576
4577         dev =  __dev_get_by_index(net, ifm->ifa_index);
4578         if (!dev)
4579                 return -ENODEV;
4580
4581         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4582
4583         /* We ignore other flags so far. */
4584         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4585                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4586
4587         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4588         if (!ifa) {
4589                 /*
4590                  * It would be best to check for !NLM_F_CREATE here but
4591                  * userspace already relies on not having to provide this.
4592                  */
4593                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4594                                       ifm->ifa_prefixlen, ifa_flags,
4595                                       preferred_lft, valid_lft);
4596         }
4597
4598         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4599             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4600                 err = -EEXIST;
4601         else
4602                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4603
4604         in6_ifa_put(ifa);
4605
4606         return err;
4607 }
4608
4609 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4610                           u8 scope, int ifindex)
4611 {
4612         struct ifaddrmsg *ifm;
4613
4614         ifm = nlmsg_data(nlh);
4615         ifm->ifa_family = AF_INET6;
4616         ifm->ifa_prefixlen = prefixlen;
4617         ifm->ifa_flags = flags;
4618         ifm->ifa_scope = scope;
4619         ifm->ifa_index = ifindex;
4620 }
4621
4622 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4623                          unsigned long tstamp, u32 preferred, u32 valid)
4624 {
4625         struct ifa_cacheinfo ci;
4626
4627         ci.cstamp = cstamp_delta(cstamp);
4628         ci.tstamp = cstamp_delta(tstamp);
4629         ci.ifa_prefered = preferred;
4630         ci.ifa_valid = valid;
4631
4632         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4633 }
4634
4635 static inline int rt_scope(int ifa_scope)
4636 {
4637         if (ifa_scope & IFA_HOST)
4638                 return RT_SCOPE_HOST;
4639         else if (ifa_scope & IFA_LINK)
4640                 return RT_SCOPE_LINK;
4641         else if (ifa_scope & IFA_SITE)
4642                 return RT_SCOPE_SITE;
4643         else
4644                 return RT_SCOPE_UNIVERSE;
4645 }
4646
4647 static inline int inet6_ifaddr_msgsize(void)
4648 {
4649         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4650                + nla_total_size(16) /* IFA_LOCAL */
4651                + nla_total_size(16) /* IFA_ADDRESS */
4652                + nla_total_size(sizeof(struct ifa_cacheinfo))
4653                + nla_total_size(4)  /* IFA_FLAGS */;
4654 }
4655
4656 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4657                              u32 portid, u32 seq, int event, unsigned int flags)
4658 {
4659         struct nlmsghdr  *nlh;
4660         u32 preferred, valid;
4661
4662         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4663         if (!nlh)
4664                 return -EMSGSIZE;
4665
4666         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4667                       ifa->idev->dev->ifindex);
4668
4669         if (!((ifa->flags&IFA_F_PERMANENT) &&
4670               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4671                 preferred = ifa->prefered_lft;
4672                 valid = ifa->valid_lft;
4673                 if (preferred != INFINITY_LIFE_TIME) {
4674                         long tval = (jiffies - ifa->tstamp)/HZ;
4675                         if (preferred > tval)
4676                                 preferred -= tval;
4677                         else
4678                                 preferred = 0;
4679                         if (valid != INFINITY_LIFE_TIME) {
4680                                 if (valid > tval)
4681                                         valid -= tval;
4682                                 else
4683                                         valid = 0;
4684                         }
4685                 }
4686         } else {
4687                 preferred = INFINITY_LIFE_TIME;
4688                 valid = INFINITY_LIFE_TIME;
4689         }
4690
4691         if (!ipv6_addr_any(&ifa->peer_addr)) {
4692                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4693                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4694                         goto error;
4695         } else
4696                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4697                         goto error;
4698
4699         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4700                 goto error;
4701
4702         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4703                 goto error;
4704
4705         nlmsg_end(skb, nlh);
4706         return 0;
4707
4708 error:
4709         nlmsg_cancel(skb, nlh);
4710         return -EMSGSIZE;
4711 }
4712
4713 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4714                                 u32 portid, u32 seq, int event, u16 flags)
4715 {
4716         struct nlmsghdr  *nlh;
4717         u8 scope = RT_SCOPE_UNIVERSE;
4718         int ifindex = ifmca->idev->dev->ifindex;
4719
4720         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4721                 scope = RT_SCOPE_SITE;
4722
4723         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4724         if (!nlh)
4725                 return -EMSGSIZE;
4726
4727         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4728         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4729             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4730                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4731                 nlmsg_cancel(skb, nlh);
4732                 return -EMSGSIZE;
4733         }
4734
4735         nlmsg_end(skb, nlh);
4736         return 0;
4737 }
4738
4739 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4740                                 u32 portid, u32 seq, int event, unsigned int flags)
4741 {
4742         struct nlmsghdr  *nlh;
4743         u8 scope = RT_SCOPE_UNIVERSE;
4744         int ifindex = ifaca->aca_idev->dev->ifindex;
4745
4746         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4747                 scope = RT_SCOPE_SITE;
4748
4749         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4750         if (!nlh)
4751                 return -EMSGSIZE;
4752
4753         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4754         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4755             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4756                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4757                 nlmsg_cancel(skb, nlh);
4758                 return -EMSGSIZE;
4759         }
4760
4761         nlmsg_end(skb, nlh);
4762         return 0;
4763 }
4764
4765 enum addr_type_t {
4766         UNICAST_ADDR,
4767         MULTICAST_ADDR,
4768         ANYCAST_ADDR,
4769 };
4770
4771 /* called with rcu_read_lock() */
4772 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4773                           struct netlink_callback *cb, enum addr_type_t type,
4774                           int s_ip_idx, int *p_ip_idx)
4775 {
4776         struct ifmcaddr6 *ifmca;
4777         struct ifacaddr6 *ifaca;
4778         int err = 1;
4779         int ip_idx = *p_ip_idx;
4780
4781         read_lock_bh(&idev->lock);
4782         switch (type) {
4783         case UNICAST_ADDR: {
4784                 struct inet6_ifaddr *ifa;
4785
4786                 /* unicast address incl. temp addr */
4787                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4788                         if (++ip_idx < s_ip_idx)
4789                                 continue;
4790                         err = inet6_fill_ifaddr(skb, ifa,
4791                                                 NETLINK_CB(cb->skb).portid,
4792                                                 cb->nlh->nlmsg_seq,
4793                                                 RTM_NEWADDR,
4794                                                 NLM_F_MULTI);
4795                         if (err < 0)
4796                                 break;
4797                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4798                 }
4799                 break;
4800         }
4801         case MULTICAST_ADDR:
4802                 /* multicast address */
4803                 for (ifmca = idev->mc_list; ifmca;
4804                      ifmca = ifmca->next, ip_idx++) {
4805                         if (ip_idx < s_ip_idx)
4806                                 continue;
4807                         err = inet6_fill_ifmcaddr(skb, ifmca,
4808                                                   NETLINK_CB(cb->skb).portid,
4809                                                   cb->nlh->nlmsg_seq,
4810                                                   RTM_GETMULTICAST,
4811                                                   NLM_F_MULTI);
4812                         if (err < 0)
4813                                 break;
4814                 }
4815                 break;
4816         case ANYCAST_ADDR:
4817                 /* anycast address */
4818                 for (ifaca = idev->ac_list; ifaca;
4819                      ifaca = ifaca->aca_next, ip_idx++) {
4820                         if (ip_idx < s_ip_idx)
4821                                 continue;
4822                         err = inet6_fill_ifacaddr(skb, ifaca,
4823                                                   NETLINK_CB(cb->skb).portid,
4824                                                   cb->nlh->nlmsg_seq,
4825                                                   RTM_GETANYCAST,
4826                                                   NLM_F_MULTI);
4827                         if (err < 0)
4828                                 break;
4829                 }
4830                 break;
4831         default:
4832                 break;
4833         }
4834         read_unlock_bh(&idev->lock);
4835         *p_ip_idx = ip_idx;
4836         return err;
4837 }
4838
4839 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4840                            enum addr_type_t type)
4841 {
4842         struct net *net = sock_net(skb->sk);
4843         int h, s_h;
4844         int idx, ip_idx;
4845         int s_idx, s_ip_idx;
4846         struct net_device *dev;
4847         struct inet6_dev *idev;
4848         struct hlist_head *head;
4849
4850         s_h = cb->args[0];
4851         s_idx = idx = cb->args[1];
4852         s_ip_idx = ip_idx = cb->args[2];
4853
4854         rcu_read_lock();
4855         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4856         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4857                 idx = 0;
4858                 head = &net->dev_index_head[h];
4859                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4860                         if (idx < s_idx)
4861                                 goto cont;
4862                         if (h > s_h || idx > s_idx)
4863                                 s_ip_idx = 0;
4864                         ip_idx = 0;
4865                         idev = __in6_dev_get(dev);
4866                         if (!idev)
4867                                 goto cont;
4868
4869                         if (in6_dump_addrs(idev, skb, cb, type,
4870                                            s_ip_idx, &ip_idx) < 0)
4871                                 goto done;
4872 cont:
4873                         idx++;
4874                 }
4875         }
4876 done:
4877         rcu_read_unlock();
4878         cb->args[0] = h;
4879         cb->args[1] = idx;
4880         cb->args[2] = ip_idx;
4881
4882         return skb->len;
4883 }
4884
4885 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4886 {
4887         enum addr_type_t type = UNICAST_ADDR;
4888
4889         return inet6_dump_addr(skb, cb, type);
4890 }
4891
4892 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4893 {
4894         enum addr_type_t type = MULTICAST_ADDR;
4895
4896         return inet6_dump_addr(skb, cb, type);
4897 }
4898
4899
4900 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4901 {
4902         enum addr_type_t type = ANYCAST_ADDR;
4903
4904         return inet6_dump_addr(skb, cb, type);
4905 }
4906
4907 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4908                              struct netlink_ext_ack *extack)
4909 {
4910         struct net *net = sock_net(in_skb->sk);
4911         struct ifaddrmsg *ifm;
4912         struct nlattr *tb[IFA_MAX+1];
4913         struct in6_addr *addr = NULL, *peer;
4914         struct net_device *dev = NULL;
4915         struct inet6_ifaddr *ifa;
4916         struct sk_buff *skb;
4917         int err;
4918
4919         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4920                           extack);
4921         if (err < 0)
4922                 goto errout;
4923
4924         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4925         if (!addr) {
4926                 err = -EINVAL;
4927                 goto errout;
4928         }
4929
4930         ifm = nlmsg_data(nlh);
4931         if (ifm->ifa_index)
4932                 dev = __dev_get_by_index(net, ifm->ifa_index);
4933
4934         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4935         if (!ifa) {
4936                 err = -EADDRNOTAVAIL;
4937                 goto errout;
4938         }
4939
4940         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4941         if (!skb) {
4942                 err = -ENOBUFS;
4943                 goto errout_ifa;
4944         }
4945
4946         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4947                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4948         if (err < 0) {
4949                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4950                 WARN_ON(err == -EMSGSIZE);
4951                 kfree_skb(skb);
4952                 goto errout_ifa;
4953         }
4954         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4955 errout_ifa:
4956         in6_ifa_put(ifa);
4957 errout:
4958         return err;
4959 }
4960
4961 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4962 {
4963         struct sk_buff *skb;
4964         struct net *net = dev_net(ifa->idev->dev);
4965         int err = -ENOBUFS;
4966
4967         /* Don't send DELADDR notification for TENTATIVE address,
4968          * since NEWADDR notification is sent only after removing
4969          * TENTATIVE flag.
4970          */
4971         if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4972                 return;
4973
4974         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4975         if (!skb)
4976                 goto errout;
4977
4978         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4979         if (err < 0) {
4980                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4981                 WARN_ON(err == -EMSGSIZE);
4982                 kfree_skb(skb);
4983                 goto errout;
4984         }
4985         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4986         return;
4987 errout:
4988         if (err < 0)
4989                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4990 }
4991
4992 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4993                                 __s32 *array, int bytes)
4994 {
4995         BUG_ON(bytes < (DEVCONF_MAX * 4));
4996
4997         memset(array, 0, bytes);
4998         array[DEVCONF_FORWARDING] = cnf->forwarding;
4999         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5000         array[DEVCONF_MTU6] = cnf->mtu6;
5001         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5002         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5003         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5004         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5005         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5006         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5007                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5008         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5009                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5010         array[DEVCONF_RTR_SOLICIT_DELAY] =
5011                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5012         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5013         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5014                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5015         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5016                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5017         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5018         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5019         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5020         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5021         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5022         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5023         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5024         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5025         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5026 #ifdef CONFIG_IPV6_ROUTER_PREF
5027         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5028         array[DEVCONF_RTR_PROBE_INTERVAL] =
5029                 jiffies_to_msecs(cnf->rtr_probe_interval);
5030 #ifdef CONFIG_IPV6_ROUTE_INFO
5031         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5032         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5033 #endif
5034 #endif
5035         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5036         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5037 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5038         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5039         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5040 #endif
5041 #ifdef CONFIG_IPV6_MROUTE
5042         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5043 #endif
5044         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5045         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5046         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5047         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5048         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5049         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5050         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5051         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5052         /* we omit DEVCONF_STABLE_SECRET for now */
5053         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5054         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5055         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5056         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5057         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5058 #ifdef CONFIG_IPV6_SEG6_HMAC
5059         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5060 #endif
5061         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5062         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5063         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5064 }
5065
5066 static inline size_t inet6_ifla6_size(void)
5067 {
5068         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5069              + nla_total_size(sizeof(struct ifla_cacheinfo))
5070              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5071              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5072              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5073              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5074 }
5075
5076 static inline size_t inet6_if_nlmsg_size(void)
5077 {
5078         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5079                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5080                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5081                + nla_total_size(4) /* IFLA_MTU */
5082                + nla_total_size(4) /* IFLA_LINK */
5083                + nla_total_size(1) /* IFLA_OPERSTATE */
5084                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5085 }
5086
5087 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5088                                         int bytes)
5089 {
5090         int i;
5091         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5092         BUG_ON(pad < 0);
5093
5094         /* Use put_unaligned() because stats may not be aligned for u64. */
5095         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5096         for (i = 1; i < ICMP6_MIB_MAX; i++)
5097                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5098
5099         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5100 }
5101
5102 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5103                                         int bytes, size_t syncpoff)
5104 {
5105         int i, c;
5106         u64 buff[IPSTATS_MIB_MAX];
5107         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5108
5109         BUG_ON(pad < 0);
5110
5111         memset(buff, 0, sizeof(buff));
5112         buff[0] = IPSTATS_MIB_MAX;
5113
5114         for_each_possible_cpu(c) {
5115                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5116                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5117         }
5118
5119         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5120         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5121 }
5122
5123 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5124                              int bytes)
5125 {
5126         switch (attrtype) {
5127         case IFLA_INET6_STATS:
5128                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5129                                      offsetof(struct ipstats_mib, syncp));
5130                 break;
5131         case IFLA_INET6_ICMP6STATS:
5132                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5133                 break;
5134         }
5135 }
5136
5137 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5138                                   u32 ext_filter_mask)
5139 {
5140         struct nlattr *nla;
5141         struct ifla_cacheinfo ci;
5142
5143         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5144                 goto nla_put_failure;
5145         ci.max_reasm_len = IPV6_MAXPLEN;
5146         ci.tstamp = cstamp_delta(idev->tstamp);
5147         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5148         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5149         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5150                 goto nla_put_failure;
5151         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5152         if (!nla)
5153                 goto nla_put_failure;
5154         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5155
5156         /* XXX - MC not implemented */
5157
5158         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5159                 return 0;
5160
5161         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5162         if (!nla)
5163                 goto nla_put_failure;
5164         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5165
5166         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5167         if (!nla)
5168                 goto nla_put_failure;
5169         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5170
5171         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5172         if (!nla)
5173                 goto nla_put_failure;
5174
5175         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5176                 goto nla_put_failure;
5177
5178         read_lock_bh(&idev->lock);
5179         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5180         read_unlock_bh(&idev->lock);
5181
5182         return 0;
5183
5184 nla_put_failure:
5185         return -EMSGSIZE;
5186 }
5187
5188 static size_t inet6_get_link_af_size(const struct net_device *dev,
5189                                      u32 ext_filter_mask)
5190 {
5191         if (!__in6_dev_get(dev))
5192                 return 0;
5193
5194         return inet6_ifla6_size();
5195 }
5196
5197 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5198                               u32 ext_filter_mask)
5199 {
5200         struct inet6_dev *idev = __in6_dev_get(dev);
5201
5202         if (!idev)
5203                 return -ENODATA;
5204
5205         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5206                 return -EMSGSIZE;
5207
5208         return 0;
5209 }
5210
5211 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5212 {
5213         struct inet6_ifaddr *ifp;
5214         struct net_device *dev = idev->dev;
5215         bool clear_token, update_rs = false;
5216         struct in6_addr ll_addr;
5217
5218         ASSERT_RTNL();
5219
5220         if (!token)
5221                 return -EINVAL;
5222         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5223                 return -EINVAL;
5224         if (!ipv6_accept_ra(idev))
5225                 return -EINVAL;
5226         if (idev->cnf.rtr_solicits == 0)
5227                 return -EINVAL;
5228
5229         write_lock_bh(&idev->lock);
5230
5231         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5232         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5233
5234         write_unlock_bh(&idev->lock);
5235
5236         clear_token = ipv6_addr_any(token);
5237         if (clear_token)
5238                 goto update_lft;
5239
5240         if (!idev->dead && (idev->if_flags & IF_READY) &&
5241             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5242                              IFA_F_OPTIMISTIC)) {
5243                 /* If we're not ready, then normal ifup will take care
5244                  * of this. Otherwise, we need to request our rs here.
5245                  */
5246                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5247                 update_rs = true;
5248         }
5249
5250 update_lft:
5251         write_lock_bh(&idev->lock);
5252
5253         if (update_rs) {
5254                 idev->if_flags |= IF_RS_SENT;
5255                 idev->rs_interval = rfc3315_s14_backoff_init(
5256                         idev->cnf.rtr_solicit_interval);
5257                 idev->rs_probes = 1;
5258                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5259         }
5260
5261         /* Well, that's kinda nasty ... */
5262         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5263                 spin_lock(&ifp->lock);
5264                 if (ifp->tokenized) {
5265                         ifp->valid_lft = 0;
5266                         ifp->prefered_lft = 0;
5267                 }
5268                 spin_unlock(&ifp->lock);
5269         }
5270
5271         write_unlock_bh(&idev->lock);
5272         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5273         addrconf_verify_rtnl();
5274         return 0;
5275 }
5276
5277 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5278         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5279         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5280 };
5281
5282 static int inet6_validate_link_af(const struct net_device *dev,
5283                                   const struct nlattr *nla)
5284 {
5285         struct nlattr *tb[IFLA_INET6_MAX + 1];
5286
5287         if (dev && !__in6_dev_get(dev))
5288                 return -EAFNOSUPPORT;
5289
5290         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5291                                 NULL);
5292 }
5293
5294 static int check_addr_gen_mode(int mode)
5295 {
5296         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5297             mode != IN6_ADDR_GEN_MODE_NONE &&
5298             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5299             mode != IN6_ADDR_GEN_MODE_RANDOM)
5300                 return -EINVAL;
5301         return 1;
5302 }
5303
5304 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5305                                 int mode)
5306 {
5307         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5308             !idev->cnf.stable_secret.initialized &&
5309             !net->ipv6.devconf_dflt->stable_secret.initialized)
5310                 return -EINVAL;
5311         return 1;
5312 }
5313
5314 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5315 {
5316         int err = -EINVAL;
5317         struct inet6_dev *idev = __in6_dev_get(dev);
5318         struct nlattr *tb[IFLA_INET6_MAX + 1];
5319
5320         if (!idev)
5321                 return -EAFNOSUPPORT;
5322
5323         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5324                 BUG();
5325
5326         if (tb[IFLA_INET6_TOKEN]) {
5327                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5328                 if (err)
5329                         return err;
5330         }
5331
5332         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5333                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5334
5335                 if (check_addr_gen_mode(mode) < 0 ||
5336                     check_stable_privacy(idev, dev_net(dev), mode) < 0)
5337                         return -EINVAL;
5338
5339                 idev->cnf.addr_gen_mode = mode;
5340                 err = 0;
5341         }
5342
5343         return err;
5344 }
5345
5346 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5347                              u32 portid, u32 seq, int event, unsigned int flags)
5348 {
5349         struct net_device *dev = idev->dev;
5350         struct ifinfomsg *hdr;
5351         struct nlmsghdr *nlh;
5352         void *protoinfo;
5353
5354         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5355         if (!nlh)
5356                 return -EMSGSIZE;
5357
5358         hdr = nlmsg_data(nlh);
5359         hdr->ifi_family = AF_INET6;
5360         hdr->__ifi_pad = 0;
5361         hdr->ifi_type = dev->type;
5362         hdr->ifi_index = dev->ifindex;
5363         hdr->ifi_flags = dev_get_flags(dev);
5364         hdr->ifi_change = 0;
5365
5366         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5367             (dev->addr_len &&
5368              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5369             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5370             (dev->ifindex != dev_get_iflink(dev) &&
5371              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5372             nla_put_u8(skb, IFLA_OPERSTATE,
5373                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5374                 goto nla_put_failure;
5375         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5376         if (!protoinfo)
5377                 goto nla_put_failure;
5378
5379         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5380                 goto nla_put_failure;
5381
5382         nla_nest_end(skb, protoinfo);
5383         nlmsg_end(skb, nlh);
5384         return 0;
5385
5386 nla_put_failure:
5387         nlmsg_cancel(skb, nlh);
5388         return -EMSGSIZE;
5389 }
5390
5391 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5392 {
5393         struct net *net = sock_net(skb->sk);
5394         int h, s_h;
5395         int idx = 0, s_idx;
5396         struct net_device *dev;
5397         struct inet6_dev *idev;
5398         struct hlist_head *head;
5399
5400         s_h = cb->args[0];
5401         s_idx = cb->args[1];
5402
5403         rcu_read_lock();
5404         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5405                 idx = 0;
5406                 head = &net->dev_index_head[h];
5407                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5408                         if (idx < s_idx)
5409                                 goto cont;
5410                         idev = __in6_dev_get(dev);
5411                         if (!idev)
5412                                 goto cont;
5413                         if (inet6_fill_ifinfo(skb, idev,
5414                                               NETLINK_CB(cb->skb).portid,
5415                                               cb->nlh->nlmsg_seq,
5416                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5417                                 goto out;
5418 cont:
5419                         idx++;
5420                 }
5421         }
5422 out:
5423         rcu_read_unlock();
5424         cb->args[1] = idx;
5425         cb->args[0] = h;
5426
5427         return skb->len;
5428 }
5429
5430 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5431 {
5432         struct sk_buff *skb;
5433         struct net *net = dev_net(idev->dev);
5434         int err = -ENOBUFS;
5435
5436         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5437         if (!skb)
5438                 goto errout;
5439
5440         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5441         if (err < 0) {
5442                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5443                 WARN_ON(err == -EMSGSIZE);
5444                 kfree_skb(skb);
5445                 goto errout;
5446         }
5447         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5448         return;
5449 errout:
5450         if (err < 0)
5451                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5452 }
5453
5454 static inline size_t inet6_prefix_nlmsg_size(void)
5455 {
5456         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5457                + nla_total_size(sizeof(struct in6_addr))
5458                + nla_total_size(sizeof(struct prefix_cacheinfo));
5459 }
5460
5461 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5462                              struct prefix_info *pinfo, u32 portid, u32 seq,
5463                              int event, unsigned int flags)
5464 {
5465         struct prefixmsg *pmsg;
5466         struct nlmsghdr *nlh;
5467         struct prefix_cacheinfo ci;
5468
5469         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5470         if (!nlh)
5471                 return -EMSGSIZE;
5472
5473         pmsg = nlmsg_data(nlh);
5474         pmsg->prefix_family = AF_INET6;
5475         pmsg->prefix_pad1 = 0;
5476         pmsg->prefix_pad2 = 0;
5477         pmsg->prefix_ifindex = idev->dev->ifindex;
5478         pmsg->prefix_len = pinfo->prefix_len;
5479         pmsg->prefix_type = pinfo->type;
5480         pmsg->prefix_pad3 = 0;
5481         pmsg->prefix_flags = 0;
5482         if (pinfo->onlink)
5483                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5484         if (pinfo->autoconf)
5485                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5486
5487         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5488                 goto nla_put_failure;
5489         ci.preferred_time = ntohl(pinfo->prefered);
5490         ci.valid_time = ntohl(pinfo->valid);
5491         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5492                 goto nla_put_failure;
5493         nlmsg_end(skb, nlh);
5494         return 0;
5495
5496 nla_put_failure:
5497         nlmsg_cancel(skb, nlh);
5498         return -EMSGSIZE;
5499 }
5500
5501 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5502                          struct prefix_info *pinfo)
5503 {
5504         struct sk_buff *skb;
5505         struct net *net = dev_net(idev->dev);
5506         int err = -ENOBUFS;
5507
5508         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5509         if (!skb)
5510                 goto errout;
5511
5512         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5513         if (err < 0) {
5514                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5515                 WARN_ON(err == -EMSGSIZE);
5516                 kfree_skb(skb);
5517                 goto errout;
5518         }
5519         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5520         return;
5521 errout:
5522         if (err < 0)
5523                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5524 }
5525
5526 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5527 {
5528         struct net *net = dev_net(ifp->idev->dev);
5529
5530         if (event)
5531                 ASSERT_RTNL();
5532
5533         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5534
5535         switch (event) {
5536         case RTM_NEWADDR:
5537                 /*
5538                  * If the address was optimistic
5539                  * we inserted the route at the start of
5540                  * our DAD process, so we don't need
5541                  * to do it again
5542                  */
5543                 if (!(ifp->rt->rt6i_node))
5544                         ip6_ins_rt(ifp->rt);
5545                 if (ifp->idev->cnf.forwarding)
5546                         addrconf_join_anycast(ifp);
5547                 if (!ipv6_addr_any(&ifp->peer_addr))
5548                         addrconf_prefix_route(&ifp->peer_addr, 128,
5549                                               ifp->idev->dev, 0, 0);
5550                 break;
5551         case RTM_DELADDR:
5552                 if (ifp->idev->cnf.forwarding)
5553                         addrconf_leave_anycast(ifp);
5554                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5555                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5556                         struct rt6_info *rt;
5557
5558                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5559                                                        ifp->idev->dev, 0, 0);
5560                         if (rt)
5561                                 ip6_del_rt(rt);
5562                 }
5563                 if (ifp->rt) {
5564                         dst_hold(&ifp->rt->dst);
5565                         ip6_del_rt(ifp->rt);
5566                 }
5567                 rt_genid_bump_ipv6(net);
5568                 break;
5569         }
5570         atomic_inc(&net->ipv6.dev_addr_genid);
5571 }
5572
5573 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5574 {
5575         rcu_read_lock_bh();
5576         if (likely(ifp->idev->dead == 0))
5577                 __ipv6_ifa_notify(event, ifp);
5578         rcu_read_unlock_bh();
5579 }
5580
5581 #ifdef CONFIG_SYSCTL
5582
5583 static
5584 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5585                            void __user *buffer, size_t *lenp, loff_t *ppos)
5586 {
5587         int *valp = ctl->data;
5588         int val = *valp;
5589         loff_t pos = *ppos;
5590         struct ctl_table lctl;
5591         int ret;
5592
5593         /*
5594          * ctl->data points to idev->cnf.forwarding, we should
5595          * not modify it until we get the rtnl lock.
5596          */
5597         lctl = *ctl;
5598         lctl.data = &val;
5599
5600         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5601
5602         if (write)
5603                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5604         if (ret)
5605                 *ppos = pos;
5606         return ret;
5607 }
5608
5609 static
5610 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5611                         void __user *buffer, size_t *lenp, loff_t *ppos)
5612 {
5613         struct inet6_dev *idev = ctl->extra1;
5614         int min_mtu = IPV6_MIN_MTU;
5615         struct ctl_table lctl;
5616
5617         lctl = *ctl;
5618         lctl.extra1 = &min_mtu;
5619         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5620
5621         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5622 }
5623
5624 static void dev_disable_change(struct inet6_dev *idev)
5625 {
5626         struct netdev_notifier_info info;
5627
5628         if (!idev || !idev->dev)
5629                 return;
5630
5631         netdev_notifier_info_init(&info, idev->dev);
5632         if (idev->cnf.disable_ipv6)
5633                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5634         else
5635                 addrconf_notify(NULL, NETDEV_UP, &info);
5636 }
5637
5638 static void addrconf_disable_change(struct net *net, __s32 newf)
5639 {
5640         struct net_device *dev;
5641         struct inet6_dev *idev;
5642
5643         for_each_netdev(net, dev) {
5644                 idev = __in6_dev_get(dev);
5645                 if (idev) {
5646                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5647                         idev->cnf.disable_ipv6 = newf;
5648                         if (changed)
5649                                 dev_disable_change(idev);
5650                 }
5651         }
5652 }
5653
5654 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5655 {
5656         struct net *net;
5657         int old;
5658
5659         if (!rtnl_trylock())
5660                 return restart_syscall();
5661
5662         net = (struct net *)table->extra2;
5663         old = *p;
5664         *p = newf;
5665
5666         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5667                 rtnl_unlock();
5668                 return 0;
5669         }
5670
5671         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5672                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5673                 addrconf_disable_change(net, newf);
5674         } else if ((!newf) ^ (!old))
5675                 dev_disable_change((struct inet6_dev *)table->extra1);
5676
5677         rtnl_unlock();
5678         return 0;
5679 }
5680
5681 static
5682 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5683                             void __user *buffer, size_t *lenp, loff_t *ppos)
5684 {
5685         int *valp = ctl->data;
5686         int val = *valp;
5687         loff_t pos = *ppos;
5688         struct ctl_table lctl;
5689         int ret;
5690
5691         /*
5692          * ctl->data points to idev->cnf.disable_ipv6, we should
5693          * not modify it until we get the rtnl lock.
5694          */
5695         lctl = *ctl;
5696         lctl.data = &val;
5697
5698         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5699
5700         if (write)
5701                 ret = addrconf_disable_ipv6(ctl, valp, val);
5702         if (ret)
5703                 *ppos = pos;
5704         return ret;
5705 }
5706
5707 static
5708 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5709                               void __user *buffer, size_t *lenp, loff_t *ppos)
5710 {
5711         int *valp = ctl->data;
5712         int ret;
5713         int old, new;
5714
5715         old = *valp;
5716         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5717         new = *valp;
5718
5719         if (write && old != new) {
5720                 struct net *net = ctl->extra2;
5721
5722                 if (!rtnl_trylock())
5723                         return restart_syscall();
5724
5725                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5726                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5727                                                      NETCONFA_PROXY_NEIGH,
5728                                                      NETCONFA_IFINDEX_DEFAULT,
5729                                                      net->ipv6.devconf_dflt);
5730                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5731                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5732                                                      NETCONFA_PROXY_NEIGH,
5733                                                      NETCONFA_IFINDEX_ALL,
5734                                                      net->ipv6.devconf_all);
5735                 else {
5736                         struct inet6_dev *idev = ctl->extra1;
5737
5738                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5739                                                      NETCONFA_PROXY_NEIGH,
5740                                                      idev->dev->ifindex,
5741                                                      &idev->cnf);
5742                 }
5743                 rtnl_unlock();
5744         }
5745
5746         return ret;
5747 }
5748
5749 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5750                                          void __user *buffer, size_t *lenp,
5751                                          loff_t *ppos)
5752 {
5753         int ret = 0;
5754         int new_val;
5755         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5756         struct net *net = (struct net *)ctl->extra2;
5757
5758         if (!rtnl_trylock())
5759                 return restart_syscall();
5760
5761         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5762
5763         if (write) {
5764                 new_val = *((int *)ctl->data);
5765
5766                 if (check_addr_gen_mode(new_val) < 0) {
5767                         ret = -EINVAL;
5768                         goto out;
5769                 }
5770
5771                 /* request for default */
5772                 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5773                         ipv6_devconf_dflt.addr_gen_mode = new_val;
5774
5775                 /* request for individual net device */
5776                 } else {
5777                         if (!idev)
5778                                 goto out;
5779
5780                         if (check_stable_privacy(idev, net, new_val) < 0) {
5781                                 ret = -EINVAL;
5782                                 goto out;
5783                         }
5784
5785                         if (idev->cnf.addr_gen_mode != new_val) {
5786                                 idev->cnf.addr_gen_mode = new_val;
5787                                 addrconf_dev_config(idev->dev);
5788                         }
5789                 }
5790         }
5791
5792 out:
5793         rtnl_unlock();
5794
5795         return ret;
5796 }
5797
5798 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5799                                          void __user *buffer, size_t *lenp,
5800                                          loff_t *ppos)
5801 {
5802         int err;
5803         struct in6_addr addr;
5804         char str[IPV6_MAX_STRLEN];
5805         struct ctl_table lctl = *ctl;
5806         struct net *net = ctl->extra2;
5807         struct ipv6_stable_secret *secret = ctl->data;
5808
5809         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5810                 return -EIO;
5811
5812         lctl.maxlen = IPV6_MAX_STRLEN;
5813         lctl.data = str;
5814
5815         if (!rtnl_trylock())
5816                 return restart_syscall();
5817
5818         if (!write && !secret->initialized) {
5819                 err = -EIO;
5820                 goto out;
5821         }
5822
5823         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5824         if (err >= sizeof(str)) {
5825                 err = -EIO;
5826                 goto out;
5827         }
5828
5829         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5830         if (err || !write)
5831                 goto out;
5832
5833         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5834                 err = -EIO;
5835                 goto out;
5836         }
5837
5838         secret->initialized = true;
5839         secret->secret = addr;
5840
5841         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5842                 struct net_device *dev;
5843
5844                 for_each_netdev(net, dev) {
5845                         struct inet6_dev *idev = __in6_dev_get(dev);
5846
5847                         if (idev) {
5848                                 idev->cnf.addr_gen_mode =
5849                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5850                         }
5851                 }
5852         } else {
5853                 struct inet6_dev *idev = ctl->extra1;
5854
5855                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5856         }
5857
5858 out:
5859         rtnl_unlock();
5860
5861         return err;
5862 }
5863
5864 static
5865 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5866                                                 int write,
5867                                                 void __user *buffer,
5868                                                 size_t *lenp,
5869                                                 loff_t *ppos)
5870 {
5871         int *valp = ctl->data;
5872         int val = *valp;
5873         loff_t pos = *ppos;
5874         struct ctl_table lctl;
5875         int ret;
5876
5877         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5878          * we should not modify it until we get the rtnl lock.
5879          */
5880         lctl = *ctl;
5881         lctl.data = &val;
5882
5883         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5884
5885         if (write)
5886                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5887         if (ret)
5888                 *ppos = pos;
5889         return ret;
5890 }
5891
5892 static
5893 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5894 {
5895         if (rt) {
5896                 if (action)
5897                         rt->dst.flags |= DST_NOPOLICY;
5898                 else
5899                         rt->dst.flags &= ~DST_NOPOLICY;
5900         }
5901 }
5902
5903 static
5904 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5905 {
5906         struct inet6_ifaddr *ifa;
5907
5908         read_lock_bh(&idev->lock);
5909         list_for_each_entry(ifa, &idev->addr_list, if_list) {
5910                 spin_lock(&ifa->lock);
5911                 if (ifa->rt) {
5912                         struct rt6_info *rt = ifa->rt;
5913                         struct fib6_table *table = rt->rt6i_table;
5914                         int cpu;
5915
5916                         read_lock(&table->tb6_lock);
5917                         addrconf_set_nopolicy(ifa->rt, val);
5918                         if (rt->rt6i_pcpu) {
5919                                 for_each_possible_cpu(cpu) {
5920                                         struct rt6_info **rtp;
5921
5922                                         rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5923                                         addrconf_set_nopolicy(*rtp, val);
5924                                 }
5925                         }
5926                         read_unlock(&table->tb6_lock);
5927                 }
5928                 spin_unlock(&ifa->lock);
5929         }
5930         read_unlock_bh(&idev->lock);
5931 }
5932
5933 static
5934 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5935 {
5936         struct inet6_dev *idev;
5937         struct net *net;
5938
5939         if (!rtnl_trylock())
5940                 return restart_syscall();
5941
5942         *valp = val;
5943
5944         net = (struct net *)ctl->extra2;
5945         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5946                 rtnl_unlock();
5947                 return 0;
5948         }
5949
5950         if (valp == &net->ipv6.devconf_all->disable_policy)  {
5951                 struct net_device *dev;
5952
5953                 for_each_netdev(net, dev) {
5954                         idev = __in6_dev_get(dev);
5955                         if (idev)
5956                                 addrconf_disable_policy_idev(idev, val);
5957                 }
5958         } else {
5959                 idev = (struct inet6_dev *)ctl->extra1;
5960                 addrconf_disable_policy_idev(idev, val);
5961         }
5962
5963         rtnl_unlock();
5964         return 0;
5965 }
5966
5967 static
5968 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5969                                    void __user *buffer, size_t *lenp,
5970                                    loff_t *ppos)
5971 {
5972         int *valp = ctl->data;
5973         int val = *valp;
5974         loff_t pos = *ppos;
5975         struct ctl_table lctl;
5976         int ret;
5977
5978         lctl = *ctl;
5979         lctl.data = &val;
5980         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5981
5982         if (write && (*valp != val))
5983                 ret = addrconf_disable_policy(ctl, valp, val);
5984
5985         if (ret)
5986                 *ppos = pos;
5987
5988         return ret;
5989 }
5990
5991 static int minus_one = -1;
5992 static const int one = 1;
5993 static const int two_five_five = 255;
5994
5995 static const struct ctl_table addrconf_sysctl[] = {
5996         {
5997                 .procname       = "forwarding",
5998                 .data           = &ipv6_devconf.forwarding,
5999                 .maxlen         = sizeof(int),
6000                 .mode           = 0644,
6001                 .proc_handler   = addrconf_sysctl_forward,
6002         },
6003         {
6004                 .procname       = "hop_limit",
6005                 .data           = &ipv6_devconf.hop_limit,
6006                 .maxlen         = sizeof(int),
6007                 .mode           = 0644,
6008                 .proc_handler   = proc_dointvec_minmax,
6009                 .extra1         = (void *)&one,
6010                 .extra2         = (void *)&two_five_five,
6011         },
6012         {
6013                 .procname       = "mtu",
6014                 .data           = &ipv6_devconf.mtu6,
6015                 .maxlen         = sizeof(int),
6016                 .mode           = 0644,
6017                 .proc_handler   = addrconf_sysctl_mtu,
6018         },
6019         {
6020                 .procname       = "accept_ra",
6021                 .data           = &ipv6_devconf.accept_ra,
6022                 .maxlen         = sizeof(int),
6023                 .mode           = 0644,
6024                 .proc_handler   = proc_dointvec,
6025         },
6026         {
6027                 .procname       = "accept_redirects",
6028                 .data           = &ipv6_devconf.accept_redirects,
6029                 .maxlen         = sizeof(int),
6030                 .mode           = 0644,
6031                 .proc_handler   = proc_dointvec,
6032         },
6033         {
6034                 .procname       = "autoconf",
6035                 .data           = &ipv6_devconf.autoconf,
6036                 .maxlen         = sizeof(int),
6037                 .mode           = 0644,
6038                 .proc_handler   = proc_dointvec,
6039         },
6040         {
6041                 .procname       = "dad_transmits",
6042                 .data           = &ipv6_devconf.dad_transmits,
6043                 .maxlen         = sizeof(int),
6044                 .mode           = 0644,
6045                 .proc_handler   = proc_dointvec,
6046         },
6047         {
6048                 .procname       = "router_solicitations",
6049                 .data           = &ipv6_devconf.rtr_solicits,
6050                 .maxlen         = sizeof(int),
6051                 .mode           = 0644,
6052                 .proc_handler   = proc_dointvec_minmax,
6053                 .extra1         = &minus_one,
6054         },
6055         {
6056                 .procname       = "router_solicitation_interval",
6057                 .data           = &ipv6_devconf.rtr_solicit_interval,
6058                 .maxlen         = sizeof(int),
6059                 .mode           = 0644,
6060                 .proc_handler   = proc_dointvec_jiffies,
6061         },
6062         {
6063                 .procname       = "router_solicitation_max_interval",
6064                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6065                 .maxlen         = sizeof(int),
6066                 .mode           = 0644,
6067                 .proc_handler   = proc_dointvec_jiffies,
6068         },
6069         {
6070                 .procname       = "router_solicitation_delay",
6071                 .data           = &ipv6_devconf.rtr_solicit_delay,
6072                 .maxlen         = sizeof(int),
6073                 .mode           = 0644,
6074                 .proc_handler   = proc_dointvec_jiffies,
6075         },
6076         {
6077                 .procname       = "force_mld_version",
6078                 .data           = &ipv6_devconf.force_mld_version,
6079                 .maxlen         = sizeof(int),
6080                 .mode           = 0644,
6081                 .proc_handler   = proc_dointvec,
6082         },
6083         {
6084                 .procname       = "mldv1_unsolicited_report_interval",
6085                 .data           =
6086                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6087                 .maxlen         = sizeof(int),
6088                 .mode           = 0644,
6089                 .proc_handler   = proc_dointvec_ms_jiffies,
6090         },
6091         {
6092                 .procname       = "mldv2_unsolicited_report_interval",
6093                 .data           =
6094                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6095                 .maxlen         = sizeof(int),
6096                 .mode           = 0644,
6097                 .proc_handler   = proc_dointvec_ms_jiffies,
6098         },
6099         {
6100                 .procname       = "use_tempaddr",
6101                 .data           = &ipv6_devconf.use_tempaddr,
6102                 .maxlen         = sizeof(int),
6103                 .mode           = 0644,
6104                 .proc_handler   = proc_dointvec,
6105         },
6106         {
6107                 .procname       = "temp_valid_lft",
6108                 .data           = &ipv6_devconf.temp_valid_lft,
6109                 .maxlen         = sizeof(int),
6110                 .mode           = 0644,
6111                 .proc_handler   = proc_dointvec,
6112         },
6113         {
6114                 .procname       = "temp_prefered_lft",
6115                 .data           = &ipv6_devconf.temp_prefered_lft,
6116                 .maxlen         = sizeof(int),
6117                 .mode           = 0644,
6118                 .proc_handler   = proc_dointvec,
6119         },
6120         {
6121                 .procname       = "regen_max_retry",
6122                 .data           = &ipv6_devconf.regen_max_retry,
6123                 .maxlen         = sizeof(int),
6124                 .mode           = 0644,
6125                 .proc_handler   = proc_dointvec,
6126         },
6127         {
6128                 .procname       = "max_desync_factor",
6129                 .data           = &ipv6_devconf.max_desync_factor,
6130                 .maxlen         = sizeof(int),
6131                 .mode           = 0644,
6132                 .proc_handler   = proc_dointvec,
6133         },
6134         {
6135                 .procname       = "max_addresses",
6136                 .data           = &ipv6_devconf.max_addresses,
6137                 .maxlen         = sizeof(int),
6138                 .mode           = 0644,
6139                 .proc_handler   = proc_dointvec,
6140         },
6141         {
6142                 .procname       = "accept_ra_defrtr",
6143                 .data           = &ipv6_devconf.accept_ra_defrtr,
6144                 .maxlen         = sizeof(int),
6145                 .mode           = 0644,
6146                 .proc_handler   = proc_dointvec,
6147         },
6148         {
6149                 .procname       = "accept_ra_min_hop_limit",
6150                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6151                 .maxlen         = sizeof(int),
6152                 .mode           = 0644,
6153                 .proc_handler   = proc_dointvec,
6154         },
6155         {
6156                 .procname       = "accept_ra_pinfo",
6157                 .data           = &ipv6_devconf.accept_ra_pinfo,
6158                 .maxlen         = sizeof(int),
6159                 .mode           = 0644,
6160                 .proc_handler   = proc_dointvec,
6161         },
6162 #ifdef CONFIG_IPV6_ROUTER_PREF
6163         {
6164                 .procname       = "accept_ra_rtr_pref",
6165                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6166                 .maxlen         = sizeof(int),
6167                 .mode           = 0644,
6168                 .proc_handler   = proc_dointvec,
6169         },
6170         {
6171                 .procname       = "router_probe_interval",
6172                 .data           = &ipv6_devconf.rtr_probe_interval,
6173                 .maxlen         = sizeof(int),
6174                 .mode           = 0644,
6175                 .proc_handler   = proc_dointvec_jiffies,
6176         },
6177 #ifdef CONFIG_IPV6_ROUTE_INFO
6178         {
6179                 .procname       = "accept_ra_rt_info_min_plen",
6180                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6181                 .maxlen         = sizeof(int),
6182                 .mode           = 0644,
6183                 .proc_handler   = proc_dointvec,
6184         },
6185         {
6186                 .procname       = "accept_ra_rt_info_max_plen",
6187                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6188                 .maxlen         = sizeof(int),
6189                 .mode           = 0644,
6190                 .proc_handler   = proc_dointvec,
6191         },
6192 #endif
6193 #endif
6194         {
6195                 .procname       = "proxy_ndp",
6196                 .data           = &ipv6_devconf.proxy_ndp,
6197                 .maxlen         = sizeof(int),
6198                 .mode           = 0644,
6199                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6200         },
6201         {
6202                 .procname       = "accept_source_route",
6203                 .data           = &ipv6_devconf.accept_source_route,
6204                 .maxlen         = sizeof(int),
6205                 .mode           = 0644,
6206                 .proc_handler   = proc_dointvec,
6207         },
6208 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6209         {
6210                 .procname       = "optimistic_dad",
6211                 .data           = &ipv6_devconf.optimistic_dad,
6212                 .maxlen         = sizeof(int),
6213                 .mode           = 0644,
6214                 .proc_handler   = proc_dointvec,
6215         },
6216         {
6217                 .procname       = "use_optimistic",
6218                 .data           = &ipv6_devconf.use_optimistic,
6219                 .maxlen         = sizeof(int),
6220                 .mode           = 0644,
6221                 .proc_handler   = proc_dointvec,
6222         },
6223 #endif
6224 #ifdef CONFIG_IPV6_MROUTE
6225         {
6226                 .procname       = "mc_forwarding",
6227                 .data           = &ipv6_devconf.mc_forwarding,
6228                 .maxlen         = sizeof(int),
6229                 .mode           = 0444,
6230                 .proc_handler   = proc_dointvec,
6231         },
6232 #endif
6233         {
6234                 .procname       = "disable_ipv6",
6235                 .data           = &ipv6_devconf.disable_ipv6,
6236                 .maxlen         = sizeof(int),
6237                 .mode           = 0644,
6238                 .proc_handler   = addrconf_sysctl_disable,
6239         },
6240         {
6241                 .procname       = "accept_dad",
6242                 .data           = &ipv6_devconf.accept_dad,
6243                 .maxlen         = sizeof(int),
6244                 .mode           = 0644,
6245                 .proc_handler   = proc_dointvec,
6246         },
6247         {
6248                 .procname       = "force_tllao",
6249                 .data           = &ipv6_devconf.force_tllao,
6250                 .maxlen         = sizeof(int),
6251                 .mode           = 0644,
6252                 .proc_handler   = proc_dointvec
6253         },
6254         {
6255                 .procname       = "ndisc_notify",
6256                 .data           = &ipv6_devconf.ndisc_notify,
6257                 .maxlen         = sizeof(int),
6258                 .mode           = 0644,
6259                 .proc_handler   = proc_dointvec
6260         },
6261         {
6262                 .procname       = "suppress_frag_ndisc",
6263                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6264                 .maxlen         = sizeof(int),
6265                 .mode           = 0644,
6266                 .proc_handler   = proc_dointvec
6267         },
6268         {
6269                 .procname       = "accept_ra_from_local",
6270                 .data           = &ipv6_devconf.accept_ra_from_local,
6271                 .maxlen         = sizeof(int),
6272                 .mode           = 0644,
6273                 .proc_handler   = proc_dointvec,
6274         },
6275         {
6276                 .procname       = "accept_ra_mtu",
6277                 .data           = &ipv6_devconf.accept_ra_mtu,
6278                 .maxlen         = sizeof(int),
6279                 .mode           = 0644,
6280                 .proc_handler   = proc_dointvec,
6281         },
6282         {
6283                 .procname       = "stable_secret",
6284                 .data           = &ipv6_devconf.stable_secret,
6285                 .maxlen         = IPV6_MAX_STRLEN,
6286                 .mode           = 0600,
6287                 .proc_handler   = addrconf_sysctl_stable_secret,
6288         },
6289         {
6290                 .procname       = "use_oif_addrs_only",
6291                 .data           = &ipv6_devconf.use_oif_addrs_only,
6292                 .maxlen         = sizeof(int),
6293                 .mode           = 0644,
6294                 .proc_handler   = proc_dointvec,
6295         },
6296         {
6297                 .procname       = "ignore_routes_with_linkdown",
6298                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6299                 .maxlen         = sizeof(int),
6300                 .mode           = 0644,
6301                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6302         },
6303         {
6304                 .procname       = "drop_unicast_in_l2_multicast",
6305                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6306                 .maxlen         = sizeof(int),
6307                 .mode           = 0644,
6308                 .proc_handler   = proc_dointvec,
6309         },
6310         {
6311                 .procname       = "drop_unsolicited_na",
6312                 .data           = &ipv6_devconf.drop_unsolicited_na,
6313                 .maxlen         = sizeof(int),
6314                 .mode           = 0644,
6315                 .proc_handler   = proc_dointvec,
6316         },
6317         {
6318                 .procname       = "keep_addr_on_down",
6319                 .data           = &ipv6_devconf.keep_addr_on_down,
6320                 .maxlen         = sizeof(int),
6321                 .mode           = 0644,
6322                 .proc_handler   = proc_dointvec,
6323
6324         },
6325         {
6326                 .procname       = "seg6_enabled",
6327                 .data           = &ipv6_devconf.seg6_enabled,
6328                 .maxlen         = sizeof(int),
6329                 .mode           = 0644,
6330                 .proc_handler   = proc_dointvec,
6331         },
6332 #ifdef CONFIG_IPV6_SEG6_HMAC
6333         {
6334                 .procname       = "seg6_require_hmac",
6335                 .data           = &ipv6_devconf.seg6_require_hmac,
6336                 .maxlen         = sizeof(int),
6337                 .mode           = 0644,
6338                 .proc_handler   = proc_dointvec,
6339         },
6340 #endif
6341         {
6342                 .procname       = "enhanced_dad",
6343                 .data           = &ipv6_devconf.enhanced_dad,
6344                 .maxlen         = sizeof(int),
6345                 .mode           = 0644,
6346                 .proc_handler   = proc_dointvec,
6347         },
6348         {
6349                 .procname               = "addr_gen_mode",
6350                 .data                   = &ipv6_devconf.addr_gen_mode,
6351                 .maxlen                 = sizeof(int),
6352                 .mode                   = 0644,
6353                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6354         },
6355         {
6356                 .procname       = "disable_policy",
6357                 .data           = &ipv6_devconf.disable_policy,
6358                 .maxlen         = sizeof(int),
6359                 .mode           = 0644,
6360                 .proc_handler   = addrconf_sysctl_disable_policy,
6361         },
6362         {
6363                 /* sentinel */
6364         }
6365 };
6366
6367 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6368                 struct inet6_dev *idev, struct ipv6_devconf *p)
6369 {
6370         int i, ifindex;
6371         struct ctl_table *table;
6372         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6373
6374         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6375         if (!table)
6376                 goto out;
6377
6378         for (i = 0; table[i].data; i++) {
6379                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6380                 /* If one of these is already set, then it is not safe to
6381                  * overwrite either of them: this makes proc_dointvec_minmax
6382                  * usable.
6383                  */
6384                 if (!table[i].extra1 && !table[i].extra2) {
6385                         table[i].extra1 = idev; /* embedded; no ref */
6386                         table[i].extra2 = net;
6387                 }
6388         }
6389
6390         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6391
6392         p->sysctl_header = register_net_sysctl(net, path, table);
6393         if (!p->sysctl_header)
6394                 goto free;
6395
6396         if (!strcmp(dev_name, "all"))
6397                 ifindex = NETCONFA_IFINDEX_ALL;
6398         else if (!strcmp(dev_name, "default"))
6399                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6400         else
6401                 ifindex = idev->dev->ifindex;
6402         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6403                                      ifindex, p);
6404         return 0;
6405
6406 free:
6407         kfree(table);
6408 out:
6409         return -ENOBUFS;
6410 }
6411
6412 static void __addrconf_sysctl_unregister(struct net *net,
6413                                          struct ipv6_devconf *p, int ifindex)
6414 {
6415         struct ctl_table *table;
6416
6417         if (!p->sysctl_header)
6418                 return;
6419
6420         table = p->sysctl_header->ctl_table_arg;
6421         unregister_net_sysctl_table(p->sysctl_header);
6422         p->sysctl_header = NULL;
6423         kfree(table);
6424
6425         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6426 }
6427
6428 static int addrconf_sysctl_register(struct inet6_dev *idev)
6429 {
6430         int err;
6431
6432         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6433                 return -EINVAL;
6434
6435         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6436                                     &ndisc_ifinfo_sysctl_change);
6437         if (err)
6438                 return err;
6439         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6440                                          idev, &idev->cnf);
6441         if (err)
6442                 neigh_sysctl_unregister(idev->nd_parms);
6443
6444         return err;
6445 }
6446
6447 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6448 {
6449         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6450                                      idev->dev->ifindex);
6451         neigh_sysctl_unregister(idev->nd_parms);
6452 }
6453
6454
6455 #endif
6456
6457 static int __net_init addrconf_init_net(struct net *net)
6458 {
6459         int err = -ENOMEM;
6460         struct ipv6_devconf *all, *dflt;
6461
6462         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6463         if (!all)
6464                 goto err_alloc_all;
6465
6466         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6467         if (!dflt)
6468                 goto err_alloc_dflt;
6469
6470         /* these will be inherited by all namespaces */
6471         dflt->autoconf = ipv6_defaults.autoconf;
6472         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6473
6474         dflt->stable_secret.initialized = false;
6475         all->stable_secret.initialized = false;
6476
6477         net->ipv6.devconf_all = all;
6478         net->ipv6.devconf_dflt = dflt;
6479
6480 #ifdef CONFIG_SYSCTL
6481         err = __addrconf_sysctl_register(net, "all", NULL, all);
6482         if (err < 0)
6483                 goto err_reg_all;
6484
6485         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6486         if (err < 0)
6487                 goto err_reg_dflt;
6488 #endif
6489         return 0;
6490
6491 #ifdef CONFIG_SYSCTL
6492 err_reg_dflt:
6493         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6494 err_reg_all:
6495         kfree(dflt);
6496 #endif
6497 err_alloc_dflt:
6498         kfree(all);
6499 err_alloc_all:
6500         return err;
6501 }
6502
6503 static void __net_exit addrconf_exit_net(struct net *net)
6504 {
6505 #ifdef CONFIG_SYSCTL
6506         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6507                                      NETCONFA_IFINDEX_DEFAULT);
6508         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6509                                      NETCONFA_IFINDEX_ALL);
6510 #endif
6511         kfree(net->ipv6.devconf_dflt);
6512         kfree(net->ipv6.devconf_all);
6513 }
6514
6515 static struct pernet_operations addrconf_ops = {
6516         .init = addrconf_init_net,
6517         .exit = addrconf_exit_net,
6518 };
6519
6520 static struct rtnl_af_ops inet6_ops __read_mostly = {
6521         .family           = AF_INET6,
6522         .fill_link_af     = inet6_fill_link_af,
6523         .get_link_af_size = inet6_get_link_af_size,
6524         .validate_link_af = inet6_validate_link_af,
6525         .set_link_af      = inet6_set_link_af,
6526 };
6527
6528 /*
6529  *      Init / cleanup code
6530  */
6531
6532 int __init addrconf_init(void)
6533 {
6534         struct inet6_dev *idev;
6535         int i, err;
6536
6537         err = ipv6_addr_label_init();
6538         if (err < 0) {
6539                 pr_crit("%s: cannot initialize default policy table: %d\n",
6540                         __func__, err);
6541                 goto out;
6542         }
6543
6544         err = register_pernet_subsys(&addrconf_ops);
6545         if (err < 0)
6546                 goto out_addrlabel;
6547
6548         addrconf_wq = create_workqueue("ipv6_addrconf");
6549         if (!addrconf_wq) {
6550                 err = -ENOMEM;
6551                 goto out_nowq;
6552         }
6553
6554         /* The addrconf netdev notifier requires that loopback_dev
6555          * has it's ipv6 private information allocated and setup
6556          * before it can bring up and give link-local addresses
6557          * to other devices which are up.
6558          *
6559          * Unfortunately, loopback_dev is not necessarily the first
6560          * entry in the global dev_base list of net devices.  In fact,
6561          * it is likely to be the very last entry on that list.
6562          * So this causes the notifier registry below to try and
6563          * give link-local addresses to all devices besides loopback_dev
6564          * first, then loopback_dev, which cases all the non-loopback_dev
6565          * devices to fail to get a link-local address.
6566          *
6567          * So, as a temporary fix, allocate the ipv6 structure for
6568          * loopback_dev first by hand.
6569          * Longer term, all of the dependencies ipv6 has upon the loopback
6570          * device and it being up should be removed.
6571          */
6572         rtnl_lock();
6573         idev = ipv6_add_dev(init_net.loopback_dev);
6574         rtnl_unlock();
6575         if (IS_ERR(idev)) {
6576                 err = PTR_ERR(idev);
6577                 goto errlo;
6578         }
6579
6580         ip6_route_init_special_entries();
6581
6582         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6583                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6584
6585         register_netdevice_notifier(&ipv6_dev_notf);
6586
6587         addrconf_verify();
6588
6589         rtnl_af_register(&inet6_ops);
6590
6591         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6592                               NULL);
6593         if (err < 0)
6594                 goto errout;
6595
6596         /* Only the first call to __rtnl_register can fail */
6597         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6598         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6599         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6600                         inet6_dump_ifaddr, NULL);
6601         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6602                         inet6_dump_ifmcaddr, NULL);
6603         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6604                         inet6_dump_ifacaddr, NULL);
6605         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6606                         inet6_netconf_dump_devconf, NULL);
6607
6608         ipv6_addr_label_rtnl_register();
6609
6610         return 0;
6611 errout:
6612         rtnl_af_unregister(&inet6_ops);
6613         unregister_netdevice_notifier(&ipv6_dev_notf);
6614 errlo:
6615         destroy_workqueue(addrconf_wq);
6616 out_nowq:
6617         unregister_pernet_subsys(&addrconf_ops);
6618 out_addrlabel:
6619         ipv6_addr_label_cleanup();
6620 out:
6621         return err;
6622 }
6623
6624 void addrconf_cleanup(void)
6625 {
6626         struct net_device *dev;
6627         int i;
6628
6629         unregister_netdevice_notifier(&ipv6_dev_notf);
6630         unregister_pernet_subsys(&addrconf_ops);
6631         ipv6_addr_label_cleanup();
6632
6633         rtnl_lock();
6634
6635         __rtnl_af_unregister(&inet6_ops);
6636
6637         /* clean dev list */
6638         for_each_netdev(&init_net, dev) {
6639                 if (__in6_dev_get(dev) == NULL)
6640                         continue;
6641                 addrconf_ifdown(dev, 1);
6642         }
6643         addrconf_ifdown(init_net.loopback_dev, 2);
6644
6645         /*
6646          *      Check hash table.
6647          */
6648         spin_lock_bh(&addrconf_hash_lock);
6649         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6650                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6651         spin_unlock_bh(&addrconf_hash_lock);
6652         cancel_delayed_work(&addr_chk_work);
6653         rtnl_unlock();
6654
6655         destroy_workqueue(addrconf_wq);
6656 }