net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <[email protected]>
   7  *      Alexey Kuznetsov        <[email protected]>
   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  *      <[email protected]>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #define pr_fmt(fmt) "IPv6: " fmt
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/kernel.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/net.h>
  49 #include <linux/inet.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_addr.h>
  53 #include <linux/if_arp.h>
  54 #include <linux/if_arcnet.h>
  55 #include <linux/if_infiniband.h>
  56 #include <linux/route.h>
  57 #include <linux/inetdevice.h>
  58 #include <linux/init.h>
  59 #include <linux/slab.h>
  60 #ifdef CONFIG_SYSCTL
  61 #include <linux/sysctl.h>
  62 #endif
  63 #include <linux/capability.h>
  64 #include <linux/delay.h>
  65 #include <linux/notifier.h>
  66 #include <linux/string.h>
  67 #include <linux/hash.h>
  68
  69 #include <net/net_namespace.h>
  70 #include <net/sock.h>
  71 #include <net/snmp.h>
  72
  73 #include <net/6lowpan.h>
  74 #include <net/firewire.h>
  75 #include <net/ipv6.h>
  76 #include <net/protocol.h>
  77 #include <net/ndisc.h>
  78 #include <net/ip6_route.h>
  79 #include <net/addrconf.h>
  80 #include <net/tcp.h>
  81 #include <net/ip.h>
  82 #include <net/netlink.h>
  83 #include <net/pkt_sched.h>
  84 #include <net/l3mdev.h>
  85 #include <linux/if_tunnel.h>
  86 #include <linux/rtnetlink.h>
  87 #include <linux/netconf.h>
  88 #include <linux/random.h>
  89 #include <linux/uaccess.h>
  90 #include <asm/unaligned.h>
  91
  92 #include <linux/proc_fs.h>
  93 #include <linux/seq_file.h>
  94 #include <linux/export.h>
  95
  96 /* Set to 3 to get tracing... */
  97 #define ACONF_DEBUG 2
  98
  99 #if ACONF_DEBUG >= 3
 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
 101 #else
 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 103 #endif
 104
 105 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 106
 107 #define IPV6_MAX_STRLEN \
 108         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
 109
 110 static inline u32 cstamp_delta(unsigned long cstamp)
 111 {
 112         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 113 }
 114
 115 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 116 {
 117         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 118         u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
 119         do_div(tmp, 1000000);
 120         return (s32)tmp;
 121 }
 122
 123 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 124 {
 125         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 126         u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
 127         do_div(tmp, 1000000);
 128         if ((s32)tmp > mrt) {
 129                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 130                 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
 131                 do_div(tmp, 1000000);
 132         }
 133         return (s32)tmp;
 134 }
 135
 136 #ifdef CONFIG_SYSCTL
 137 static int addrconf_sysctl_register(struct inet6_dev *idev);
 138 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 139 #else
 140 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 141 {
 142         return 0;
 143 }
 144
 145 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 146 {
 147 }
 148 #endif
 149
 150 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 151 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 152 static void ipv6_regen_rndid(unsigned long data);
 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);
 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_max_plen = 0,
 228 #endif
 229 #endif
 230         .proxy_ndp              = 0,
 231         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 232         .disable_ipv6           = 0,
 233         .accept_dad             = 1,
 234         .suppress_frag_ndisc    = 1,
 235         .accept_ra_mtu          = 1,
 236         .stable_secret          = {
 237                 .initialized = false,
 238         },
 239         .use_oif_addrs_only     = 0,
 240         .ignore_routes_with_linkdown = 0,
 241         .keep_addr_on_down      = 0,
 242 };
 243
 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 245         .forwarding             = 0,
 246         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 247         .mtu6                   = IPV6_MIN_MTU,
 248         .accept_ra              = 1,
 249         .accept_redirects       = 1,
 250         .autoconf               = 1,
 251         .force_mld_version      = 0,
 252         .mldv1_unsolicited_report_interval = 10 * HZ,
 253         .mldv2_unsolicited_report_interval = HZ,
 254         .dad_transmits          = 1,
 255         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 256         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 257         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 258         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 259         .use_tempaddr           = 0,
 260         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 261         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 262         .regen_max_retry        = REGEN_MAX_RETRY,
 263         .max_desync_factor      = MAX_DESYNC_FACTOR,
 264         .max_addresses          = IPV6_MAX_ADDRESSES,
 265         .accept_ra_defrtr       = 1,
 266         .accept_ra_from_local   = 0,
 267         .accept_ra_min_hop_limit= 1,
 268         .accept_ra_pinfo        = 1,
 269 #ifdef CONFIG_IPV6_ROUTER_PREF
 270         .accept_ra_rtr_pref     = 1,
 271         .rtr_probe_interval     = 60 * HZ,
 272 #ifdef CONFIG_IPV6_ROUTE_INFO
 273         .accept_ra_rt_info_max_plen = 0,
 274 #endif
 275 #endif
 276         .proxy_ndp              = 0,
 277         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 278         .disable_ipv6           = 0,
 279         .accept_dad             = 1,
 280         .suppress_frag_ndisc    = 1,
 281         .accept_ra_mtu          = 1,
 282         .stable_secret          = {
 283                 .initialized = false,
 284         },
 285         .use_oif_addrs_only     = 0,
 286         .ignore_routes_with_linkdown = 0,
 287         .keep_addr_on_down      = 0,
 288 };
 289
 290 /* Check if a valid qdisc is available */
 291 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 292 {
 293         return !qdisc_tx_is_noop(dev);
 294 }
 295
 296 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 297 {
 298         if (del_timer(&idev->rs_timer))
 299                 __in6_dev_put(idev);
 300 }
 301
 302 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 303 {
 304         if (cancel_delayed_work(&ifp->dad_work))
 305                 __in6_ifa_put(ifp);
 306 }
 307
 308 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 309                                   unsigned long when)
 310 {
 311         if (!timer_pending(&idev->rs_timer))
 312                 in6_dev_hold(idev);
 313         mod_timer(&idev->rs_timer, jiffies + when);
 314 }
 315
 316 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 317                                    unsigned long delay)
 318 {
 319         if (!delayed_work_pending(&ifp->dad_work))
 320                 in6_ifa_hold(ifp);
 321         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 322 }
 323
 324 static int snmp6_alloc_dev(struct inet6_dev *idev)
 325 {
 326         int i;
 327
 328         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 329         if (!idev->stats.ipv6)
 330                 goto err_ip;
 331
 332         for_each_possible_cpu(i) {
 333                 struct ipstats_mib *addrconf_stats;
 334                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 335                 u64_stats_init(&addrconf_stats->syncp);
 336         }
 337
 338
 339         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 340                                         GFP_KERNEL);
 341         if (!idev->stats.icmpv6dev)
 342                 goto err_icmp;
 343         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 344                                            GFP_KERNEL);
 345         if (!idev->stats.icmpv6msgdev)
 346                 goto err_icmpmsg;
 347
 348         return 0;
 349
 350 err_icmpmsg:
 351         kfree(idev->stats.icmpv6dev);
 352 err_icmp:
 353         free_percpu(idev->stats.ipv6);
 354 err_ip:
 355         return -ENOMEM;
 356 }
 357
 358 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 359 {
 360         struct inet6_dev *ndev;
 361         int err = -ENOMEM;
 362
 363         ASSERT_RTNL();
 364
 365         if (dev->mtu < IPV6_MIN_MTU)
 366                 return ERR_PTR(-EINVAL);
 367
 368         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 369         if (!ndev)
 370                 return ERR_PTR(err);
 371
 372         rwlock_init(&ndev->lock);
 373         ndev->dev = dev;
 374         INIT_LIST_HEAD(&ndev->addr_list);
 375         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 376                     (unsigned long)ndev);
 377         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 378
 379         if (ndev->cnf.stable_secret.initialized)
 380                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 381         else
 382                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
 383
 384         ndev->cnf.mtu6 = dev->mtu;
 385         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 386         if (!ndev->nd_parms) {
 387                 kfree(ndev);
 388                 return ERR_PTR(err);
 389         }
 390         if (ndev->cnf.forwarding)
 391                 dev_disable_lro(dev);
 392         /* We refer to the device */
 393         dev_hold(dev);
 394
 395         if (snmp6_alloc_dev(ndev) < 0) {
 396                 ADBG(KERN_WARNING
 397                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 398                         __func__, dev->name);
 399                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 400                 dev_put(dev);
 401                 kfree(ndev);
 402                 return ERR_PTR(err);
 403         }
 404
 405         if (snmp6_register_dev(ndev) < 0) {
 406                 ADBG(KERN_WARNING
 407                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 408                         __func__, dev->name);
 409                 goto err_release;
 410         }
 411
 412         /* One reference from device.  We must do this before
 413          * we invoke __ipv6_regen_rndid().
 414          */
 415         in6_dev_hold(ndev);
 416
 417         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 418                 ndev->cnf.accept_dad = -1;
 419
 420 #if IS_ENABLED(CONFIG_IPV6_SIT)
 421         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 422                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 423                 ndev->cnf.rtr_solicits = 0;
 424         }
 425 #endif
 426
 427         INIT_LIST_HEAD(&ndev->tempaddr_list);
 428         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 429         if ((dev->flags&IFF_LOOPBACK) ||
 430             dev->type == ARPHRD_TUNNEL ||
 431             dev->type == ARPHRD_TUNNEL6 ||
 432             dev->type == ARPHRD_SIT ||
 433             dev->type == ARPHRD_NONE) {
 434                 ndev->cnf.use_tempaddr = -1;
 435         } else {
 436                 in6_dev_hold(ndev);
 437                 ipv6_regen_rndid((unsigned long) ndev);
 438         }
 439
 440         ndev->token = in6addr_any;
 441
 442         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 443                 ndev->if_flags |= IF_READY;
 444
 445         ipv6_mc_init_dev(ndev);
 446         ndev->tstamp = jiffies;
 447         err = addrconf_sysctl_register(ndev);
 448         if (err) {
 449                 ipv6_mc_destroy_dev(ndev);
 450                 del_timer(&ndev->regen_timer);
 451                 snmp6_unregister_dev(ndev);
 452                 goto err_release;
 453         }
 454         /* protected by rtnl_lock */
 455         rcu_assign_pointer(dev->ip6_ptr, ndev);
 456
 457         /* Join interface-local all-node multicast group */
 458         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 459
 460         /* Join all-node multicast group */
 461         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 462
 463         /* Join all-router multicast group if forwarding is set */
 464         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 465                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 466
 467         return ndev;
 468
 469 err_release:
 470         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 471         ndev->dead = 1;
 472         in6_dev_finish_destroy(ndev);
 473         return ERR_PTR(err);
 474 }
 475
 476 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 477 {
 478         struct inet6_dev *idev;
 479
 480         ASSERT_RTNL();
 481
 482         idev = __in6_dev_get(dev);
 483         if (!idev) {
 484                 idev = ipv6_add_dev(dev);
 485                 if (IS_ERR(idev))
 486                         return NULL;
 487         }
 488
 489         if (dev->flags&IFF_UP)
 490                 ipv6_mc_up(idev);
 491         return idev;
 492 }
 493
 494 static int inet6_netconf_msgsize_devconf(int type)
 495 {
 496         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 497                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 498         bool all = false;
 499
 500         if (type == NETCONFA_ALL)
 501                 all = true;
 502
 503         if (all || type == NETCONFA_FORWARDING)
 504                 size += nla_total_size(4);
 505 #ifdef CONFIG_IPV6_MROUTE
 506         if (all || type == NETCONFA_MC_FORWARDING)
 507                 size += nla_total_size(4);
 508 #endif
 509         if (all || type == NETCONFA_PROXY_NEIGH)
 510                 size += nla_total_size(4);
 511
 512         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 513                 size += nla_total_size(4);
 514
 515         return size;
 516 }
 517
 518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 519                                       struct ipv6_devconf *devconf, u32 portid,
 520                                       u32 seq, int event, unsigned int flags,
 521                                       int type)
 522 {
 523         struct nlmsghdr  *nlh;
 524         struct netconfmsg *ncm;
 525         bool all = false;
 526
 527         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 528                         flags);
 529         if (!nlh)
 530                 return -EMSGSIZE;
 531
 532         if (type == NETCONFA_ALL)
 533                 all = true;
 534
 535         ncm = nlmsg_data(nlh);
 536         ncm->ncm_family = AF_INET6;
 537
 538         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 539                 goto nla_put_failure;
 540
 541         if ((all || type == NETCONFA_FORWARDING) &&
 542             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 543                 goto nla_put_failure;
 544 #ifdef CONFIG_IPV6_MROUTE
 545         if ((all || type == NETCONFA_MC_FORWARDING) &&
 546             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 547                         devconf->mc_forwarding) < 0)
 548                 goto nla_put_failure;
 549 #endif
 550         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 551             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 552                 goto nla_put_failure;
 553
 554         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 555             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 556                         devconf->ignore_routes_with_linkdown) < 0)
 557                 goto nla_put_failure;
 558
 559         nlmsg_end(skb, nlh);
 560         return 0;
 561
 562 nla_put_failure:
 563         nlmsg_cancel(skb, nlh);
 564         return -EMSGSIZE;
 565 }
 566
 567 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 568                                   struct ipv6_devconf *devconf)
 569 {
 570         struct sk_buff *skb;
 571         int err = -ENOBUFS;
 572
 573         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 574         if (!skb)
 575                 goto errout;
 576
 577         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 578                                          RTM_NEWNETCONF, 0, type);
 579         if (err < 0) {
 580                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 581                 WARN_ON(err == -EMSGSIZE);
 582                 kfree_skb(skb);
 583                 goto errout;
 584         }
 585         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 586         return;
 587 errout:
 588         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 589 }
 590
 591 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 592         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 593         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 594         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 595         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 596 };
 597
 598 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 599                                      struct nlmsghdr *nlh)
 600 {
 601         struct net *net = sock_net(in_skb->sk);
 602         struct nlattr *tb[NETCONFA_MAX+1];
 603         struct netconfmsg *ncm;
 604         struct sk_buff *skb;
 605         struct ipv6_devconf *devconf;
 606         struct inet6_dev *in6_dev;
 607         struct net_device *dev;
 608         int ifindex;
 609         int err;
 610
 611         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 612                           devconf_ipv6_policy);
 613         if (err < 0)
 614                 goto errout;
 615
 616         err = -EINVAL;
 617         if (!tb[NETCONFA_IFINDEX])
 618                 goto errout;
 619
 620         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 621         switch (ifindex) {
 622         case NETCONFA_IFINDEX_ALL:
 623                 devconf = net->ipv6.devconf_all;
 624                 break;
 625         case NETCONFA_IFINDEX_DEFAULT:
 626                 devconf = net->ipv6.devconf_dflt;
 627                 break;
 628         default:
 629                 dev = __dev_get_by_index(net, ifindex);
 630                 if (!dev)
 631                         goto errout;
 632                 in6_dev = __in6_dev_get(dev);
 633                 if (!in6_dev)
 634                         goto errout;
 635                 devconf = &in6_dev->cnf;
 636                 break;
 637         }
 638
 639         err = -ENOBUFS;
 640         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
 641         if (!skb)
 642                 goto errout;
 643
 644         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 645                                          NETLINK_CB(in_skb).portid,
 646                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 647                                          NETCONFA_ALL);
 648         if (err < 0) {
 649                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 650                 WARN_ON(err == -EMSGSIZE);
 651                 kfree_skb(skb);
 652                 goto errout;
 653         }
 654         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 655 errout:
 656         return err;
 657 }
 658
 659 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 660                                       struct netlink_callback *cb)
 661 {
 662         struct net *net = sock_net(skb->sk);
 663         int h, s_h;
 664         int idx, s_idx;
 665         struct net_device *dev;
 666         struct inet6_dev *idev;
 667         struct hlist_head *head;
 668
 669         s_h = cb->args[0];
 670         s_idx = idx = cb->args[1];
 671
 672         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 673                 idx = 0;
 674                 head = &net->dev_index_head[h];
 675                 rcu_read_lock();
 676                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 677                           net->dev_base_seq;
 678                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 679                         if (idx < s_idx)
 680                                 goto cont;
 681                         idev = __in6_dev_get(dev);
 682                         if (!idev)
 683                                 goto cont;
 684
 685                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 686                                                        &idev->cnf,
 687                                                        NETLINK_CB(cb->skb).portid,
 688                                                        cb->nlh->nlmsg_seq,
 689                                                        RTM_NEWNETCONF,
 690                                                        NLM_F_MULTI,
 691                                                        NETCONFA_ALL) < 0) {
 692                                 rcu_read_unlock();
 693                                 goto done;
 694                         }
 695                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 696 cont:
 697                         idx++;
 698                 }
 699                 rcu_read_unlock();
 700         }
 701         if (h == NETDEV_HASHENTRIES) {
 702                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 703                                                net->ipv6.devconf_all,
 704                                                NETLINK_CB(cb->skb).portid,
 705                                                cb->nlh->nlmsg_seq,
 706                                                RTM_NEWNETCONF, NLM_F_MULTI,
 707                                                NETCONFA_ALL) < 0)
 708                         goto done;
 709                 else
 710                         h++;
 711         }
 712         if (h == NETDEV_HASHENTRIES + 1) {
 713                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 714                                                net->ipv6.devconf_dflt,
 715                                                NETLINK_CB(cb->skb).portid,
 716                                                cb->nlh->nlmsg_seq,
 717                                                RTM_NEWNETCONF, NLM_F_MULTI,
 718                                                NETCONFA_ALL) < 0)
 719                         goto done;
 720                 else
 721                         h++;
 722         }
 723 done:
 724         cb->args[0] = h;
 725         cb->args[1] = idx;
 726
 727         return skb->len;
 728 }
 729
 730 #ifdef CONFIG_SYSCTL
 731 static void dev_forward_change(struct inet6_dev *idev)
 732 {
 733         struct net_device *dev;
 734         struct inet6_ifaddr *ifa;
 735
 736         if (!idev)
 737                 return;
 738         dev = idev->dev;
 739         if (idev->cnf.forwarding)
 740                 dev_disable_lro(dev);
 741         if (dev->flags & IFF_MULTICAST) {
 742                 if (idev->cnf.forwarding) {
 743                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 744                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 745                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 746                 } else {
 747                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 748                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 749                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 750                 }
 751         }
 752
 753         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 754                 if (ifa->flags&IFA_F_TENTATIVE)
 755                         continue;
 756                 if (idev->cnf.forwarding)
 757                         addrconf_join_anycast(ifa);
 758                 else
 759                         addrconf_leave_anycast(ifa);
 760         }
 761         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 762                                      dev->ifindex, &idev->cnf);
 763 }
 764
 765
 766 static void addrconf_forward_change(struct net *net, __s32 newf)
 767 {
 768         struct net_device *dev;
 769         struct inet6_dev *idev;
 770
 771         for_each_netdev(net, dev) {
 772                 idev = __in6_dev_get(dev);
 773                 if (idev) {
 774                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 775                         idev->cnf.forwarding = newf;
 776                         if (changed)
 777                                 dev_forward_change(idev);
 778                 }
 779         }
 780 }
 781
 782 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 783 {
 784         struct net *net;
 785         int old;
 786
 787         if (!rtnl_trylock())
 788                 return restart_syscall();
 789
 790         net = (struct net *)table->extra2;
 791         old = *p;
 792         *p = newf;
 793
 794         if (p == &net->ipv6.devconf_dflt->forwarding) {
 795                 if ((!newf) ^ (!old))
 796                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 797                                                      NETCONFA_IFINDEX_DEFAULT,
 798                                                      net->ipv6.devconf_dflt);
 799                 rtnl_unlock();
 800                 return 0;
 801         }
 802
 803         if (p == &net->ipv6.devconf_all->forwarding) {
 804                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 805
 806                 net->ipv6.devconf_dflt->forwarding = newf;
 807                 if ((!newf) ^ (!old_dflt))
 808                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 809                                                      NETCONFA_IFINDEX_DEFAULT,
 810                                                      net->ipv6.devconf_dflt);
 811
 812                 addrconf_forward_change(net, newf);
 813                 if ((!newf) ^ (!old))
 814                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 815                                                      NETCONFA_IFINDEX_ALL,
 816                                                      net->ipv6.devconf_all);
 817         } else if ((!newf) ^ (!old))
 818                 dev_forward_change((struct inet6_dev *)table->extra1);
 819         rtnl_unlock();
 820
 821         if (newf)
 822                 rt6_purge_dflt_routers(net);
 823         return 1;
 824 }
 825
 826 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 827 {
 828         struct net_device *dev;
 829         struct inet6_dev *idev;
 830
 831         for_each_netdev(net, dev) {
 832                 idev = __in6_dev_get(dev);
 833                 if (idev) {
 834                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 835
 836                         idev->cnf.ignore_routes_with_linkdown = newf;
 837                         if (changed)
 838                                 inet6_netconf_notify_devconf(dev_net(dev),
 839                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 840                                                              dev->ifindex,
 841                                                              &idev->cnf);
 842                 }
 843         }
 844 }
 845
 846 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 847 {
 848         struct net *net;
 849         int old;
 850
 851         if (!rtnl_trylock())
 852                 return restart_syscall();
 853
 854         net = (struct net *)table->extra2;
 855         old = *p;
 856         *p = newf;
 857
 858         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 859                 if ((!newf) ^ (!old))
 860                         inet6_netconf_notify_devconf(net,
 861                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 862                                                      NETCONFA_IFINDEX_DEFAULT,
 863                                                      net->ipv6.devconf_dflt);
 864                 rtnl_unlock();
 865                 return 0;
 866         }
 867
 868         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 869                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 870                 addrconf_linkdown_change(net, newf);
 871                 if ((!newf) ^ (!old))
 872                         inet6_netconf_notify_devconf(net,
 873                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 874                                                      NETCONFA_IFINDEX_ALL,
 875                                                      net->ipv6.devconf_all);
 876         }
 877         rtnl_unlock();
 878
 879         return 1;
 880 }
 881
 882 #endif
 883
 884 /* Nobody refers to this ifaddr, destroy it */
 885 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 886 {
 887         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 888
 889 #ifdef NET_REFCNT_DEBUG
 890         pr_debug("%s\n", __func__);
 891 #endif
 892
 893         in6_dev_put(ifp->idev);
 894
 895         if (cancel_delayed_work(&ifp->dad_work))
 896                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 897                           ifp);
 898
 899         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 900                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 901                 return;
 902         }
 903         ip6_rt_put(ifp->rt);
 904
 905         kfree_rcu(ifp, rcu);
 906 }
 907
 908 static void
 909 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 910 {
 911         struct list_head *p;
 912         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 913
 914         /*
 915          * Each device address list is sorted in order of scope -
 916          * global before linklocal.
 917          */
 918         list_for_each(p, &idev->addr_list) {
 919                 struct inet6_ifaddr *ifa
 920                         = list_entry(p, struct inet6_ifaddr, if_list);
 921                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 922                         break;
 923         }
 924
 925         list_add_tail(&ifp->if_list, p);
 926 }
 927
 928 static u32 inet6_addr_hash(const struct in6_addr *addr)
 929 {
 930         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 931 }
 932
 933 /* On success it returns ifp with increased reference count */
 934
 935 static struct inet6_ifaddr *
 936 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 937               const struct in6_addr *peer_addr, int pfxlen,
 938               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 939 {
 940         struct inet6_ifaddr *ifa = NULL;
 941         struct rt6_info *rt;
 942         unsigned int hash;
 943         int err = 0;
 944         int addr_type = ipv6_addr_type(addr);
 945
 946         if (addr_type == IPV6_ADDR_ANY ||
 947             addr_type & IPV6_ADDR_MULTICAST ||
 948             (!(idev->dev->flags & IFF_LOOPBACK) &&
 949              addr_type & IPV6_ADDR_LOOPBACK))
 950                 return ERR_PTR(-EADDRNOTAVAIL);
 951
 952         rcu_read_lock_bh();
 953         if (idev->dead) {
 954                 err = -ENODEV;                  /*XXX*/
 955                 goto out2;
 956         }
 957
 958         if (idev->cnf.disable_ipv6) {
 959                 err = -EACCES;
 960                 goto out2;
 961         }
 962
 963         spin_lock(&addrconf_hash_lock);
 964
 965         /* Ignore adding duplicate addresses on an interface */
 966         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 967                 ADBG("ipv6_add_addr: already assigned\n");
 968                 err = -EEXIST;
 969                 goto out;
 970         }
 971
 972         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 973
 974         if (!ifa) {
 975                 ADBG("ipv6_add_addr: malloc failed\n");
 976                 err = -ENOBUFS;
 977                 goto out;
 978         }
 979
 980         rt = addrconf_dst_alloc(idev, addr, false);
 981         if (IS_ERR(rt)) {
 982                 err = PTR_ERR(rt);
 983                 goto out;
 984         }
 985
 986         neigh_parms_data_state_setall(idev->nd_parms);
 987
 988         ifa->addr = *addr;
 989         if (peer_addr)
 990                 ifa->peer_addr = *peer_addr;
 991
 992         spin_lock_init(&ifa->lock);
 993         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 994         INIT_HLIST_NODE(&ifa->addr_lst);
 995         ifa->scope = scope;
 996         ifa->prefix_len = pfxlen;
 997         ifa->flags = flags | IFA_F_TENTATIVE;
 998         ifa->valid_lft = valid_lft;
 999         ifa->prefered_lft = prefered_lft;
1000         ifa->cstamp = ifa->tstamp = jiffies;
1001         ifa->tokenized = false;
1002
1003         ifa->rt = rt;
1004
1005         ifa->idev = idev;
1006         in6_dev_hold(idev);
1007         /* For caller */
1008         in6_ifa_hold(ifa);
1009
1010         /* Add to big hash table */
1011         hash = inet6_addr_hash(addr);
1012
1013         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1014         spin_unlock(&addrconf_hash_lock);
1015
1016         write_lock(&idev->lock);
1017         /* Add to inet6_dev unicast addr list. */
1018         ipv6_link_dev_addr(idev, ifa);
1019
1020         if (ifa->flags&IFA_F_TEMPORARY) {
1021                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1022                 in6_ifa_hold(ifa);
1023         }
1024
1025         in6_ifa_hold(ifa);
1026         write_unlock(&idev->lock);
1027 out2:
1028         rcu_read_unlock_bh();
1029
1030         if (likely(err == 0))
1031                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1032         else {
1033                 kfree(ifa);
1034                 ifa = ERR_PTR(err);
1035         }
1036
1037         return ifa;
1038 out:
1039         spin_unlock(&addrconf_hash_lock);
1040         goto out2;
1041 }
1042
1043 enum cleanup_prefix_rt_t {
1044         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1045         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1046         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1047 };
1048
1049 /*
1050  * Check, whether the prefix for ifp would still need a prefix route
1051  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1052  * constants.
1053  *
1054  * 1) we don't purge prefix if address was not permanent.
1055  *    prefix is managed by its own lifetime.
1056  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1057  * 3) if there are no addresses, delete prefix.
1058  * 4) if there are still other permanent address(es),
1059  *    corresponding prefix is still permanent.
1060  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1061  *    don't purge the prefix, assume user space is managing it.
1062  * 6) otherwise, update prefix lifetime to the
1063  *    longest valid lifetime among the corresponding
1064  *    addresses on the device.
1065  *    Note: subsequent RA will update lifetime.
1066  **/
1067 static enum cleanup_prefix_rt_t
1068 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1069 {
1070         struct inet6_ifaddr *ifa;
1071         struct inet6_dev *idev = ifp->idev;
1072         unsigned long lifetime;
1073         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1074
1075         *expires = jiffies;
1076
1077         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1078                 if (ifa == ifp)
1079                         continue;
1080                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1081                                        ifp->prefix_len))
1082                         continue;
1083                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1084                         return CLEANUP_PREFIX_RT_NOP;
1085
1086                 action = CLEANUP_PREFIX_RT_EXPIRE;
1087
1088                 spin_lock(&ifa->lock);
1089
1090                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1091                 /*
1092                  * Note: Because this address is
1093                  * not permanent, lifetime <
1094                  * LONG_MAX / HZ here.
1095                  */
1096                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1097                         *expires = ifa->tstamp + lifetime * HZ;
1098                 spin_unlock(&ifa->lock);
1099         }
1100
1101         return action;
1102 }
1103
1104 static void
1105 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1106 {
1107         struct rt6_info *rt;
1108
1109         rt = addrconf_get_prefix_route(&ifp->addr,
1110                                        ifp->prefix_len,
1111                                        ifp->idev->dev,
1112                                        0, RTF_GATEWAY | RTF_DEFAULT);
1113         if (rt) {
1114                 if (del_rt)
1115                         ip6_del_rt(rt);
1116                 else {
1117                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1118                                 rt6_set_expires(rt, expires);
1119                         ip6_rt_put(rt);
1120                 }
1121         }
1122 }
1123
1124
1125 /* This function wants to get referenced ifp and releases it before return */
1126
1127 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1128 {
1129         int state;
1130         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1131         unsigned long expires;
1132
1133         ASSERT_RTNL();
1134
1135         spin_lock_bh(&ifp->lock);
1136         state = ifp->state;
1137         ifp->state = INET6_IFADDR_STATE_DEAD;
1138         spin_unlock_bh(&ifp->lock);
1139
1140         if (state == INET6_IFADDR_STATE_DEAD)
1141                 goto out;
1142
1143         spin_lock_bh(&addrconf_hash_lock);
1144         hlist_del_init_rcu(&ifp->addr_lst);
1145         spin_unlock_bh(&addrconf_hash_lock);
1146
1147         write_lock_bh(&ifp->idev->lock);
1148
1149         if (ifp->flags&IFA_F_TEMPORARY) {
1150                 list_del(&ifp->tmp_list);
1151                 if (ifp->ifpub) {
1152                         in6_ifa_put(ifp->ifpub);
1153                         ifp->ifpub = NULL;
1154                 }
1155                 __in6_ifa_put(ifp);
1156         }
1157
1158         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1159                 action = check_cleanup_prefix_route(ifp, &expires);
1160
1161         list_del_init(&ifp->if_list);
1162         __in6_ifa_put(ifp);
1163
1164         write_unlock_bh(&ifp->idev->lock);
1165
1166         addrconf_del_dad_work(ifp);
1167
1168         ipv6_ifa_notify(RTM_DELADDR, ifp);
1169
1170         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1171
1172         if (action != CLEANUP_PREFIX_RT_NOP) {
1173                 cleanup_prefix_route(ifp, expires,
1174                         action == CLEANUP_PREFIX_RT_DEL);
1175         }
1176
1177         /* clean up prefsrc entries */
1178         rt6_remove_prefsrc(ifp);
1179 out:
1180         in6_ifa_put(ifp);
1181 }
1182
1183 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1184 {
1185         struct inet6_dev *idev = ifp->idev;
1186         struct in6_addr addr, *tmpaddr;
1187         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1188         unsigned long regen_advance;
1189         int tmp_plen;
1190         int ret = 0;
1191         u32 addr_flags;
1192         unsigned long now = jiffies;
1193
1194         write_lock_bh(&idev->lock);
1195         if (ift) {
1196                 spin_lock_bh(&ift->lock);
1197                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1198                 spin_unlock_bh(&ift->lock);
1199                 tmpaddr = &addr;
1200         } else {
1201                 tmpaddr = NULL;
1202         }
1203 retry:
1204         in6_dev_hold(idev);
1205         if (idev->cnf.use_tempaddr <= 0) {
1206                 write_unlock_bh(&idev->lock);
1207                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1208                 in6_dev_put(idev);
1209                 ret = -1;
1210                 goto out;
1211         }
1212         spin_lock_bh(&ifp->lock);
1213         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1214                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1215                 spin_unlock_bh(&ifp->lock);
1216                 write_unlock_bh(&idev->lock);
1217                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1218                         __func__);
1219                 in6_dev_put(idev);
1220                 ret = -1;
1221                 goto out;
1222         }
1223         in6_ifa_hold(ifp);
1224         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1225         __ipv6_try_regen_rndid(idev, tmpaddr);
1226         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1227         age = (now - ifp->tstamp) / HZ;
1228         tmp_valid_lft = min_t(__u32,
1229                               ifp->valid_lft,
1230                               idev->cnf.temp_valid_lft + age);
1231         tmp_prefered_lft = min_t(__u32,
1232                                  ifp->prefered_lft,
1233                                  idev->cnf.temp_prefered_lft + age -
1234                                  idev->cnf.max_desync_factor);
1235         tmp_plen = ifp->prefix_len;
1236         tmp_tstamp = ifp->tstamp;
1237         spin_unlock_bh(&ifp->lock);
1238
1239         regen_advance = idev->cnf.regen_max_retry *
1240                         idev->cnf.dad_transmits *
1241                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1242         write_unlock_bh(&idev->lock);
1243
1244         /* A temporary address is created only if this calculated Preferred
1245          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1246          * an implementation must not create a temporary address with a zero
1247          * Preferred Lifetime.
1248          * Use age calculation as in addrconf_verify to avoid unnecessary
1249          * temporary addresses being generated.
1250          */
1251         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1252         if (tmp_prefered_lft <= regen_advance + age) {
1253                 in6_ifa_put(ifp);
1254                 in6_dev_put(idev);
1255                 ret = -1;
1256                 goto out;
1257         }
1258
1259         addr_flags = IFA_F_TEMPORARY;
1260         /* set in addrconf_prefix_rcv() */
1261         if (ifp->flags & IFA_F_OPTIMISTIC)
1262                 addr_flags |= IFA_F_OPTIMISTIC;
1263
1264         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1265                             ipv6_addr_scope(&addr), addr_flags,
1266                             tmp_valid_lft, tmp_prefered_lft);
1267         if (IS_ERR(ift)) {
1268                 in6_ifa_put(ifp);
1269                 in6_dev_put(idev);
1270                 pr_info("%s: retry temporary address regeneration\n", __func__);
1271                 tmpaddr = &addr;
1272                 write_lock_bh(&idev->lock);
1273                 goto retry;
1274         }
1275
1276         spin_lock_bh(&ift->lock);
1277         ift->ifpub = ifp;
1278         ift->cstamp = now;
1279         ift->tstamp = tmp_tstamp;
1280         spin_unlock_bh(&ift->lock);
1281
1282         addrconf_dad_start(ift);
1283         in6_ifa_put(ift);
1284         in6_dev_put(idev);
1285 out:
1286         return ret;
1287 }
1288
1289 /*
1290  *      Choose an appropriate source address (RFC3484)
1291  */
1292 enum {
1293         IPV6_SADDR_RULE_INIT = 0,
1294         IPV6_SADDR_RULE_LOCAL,
1295         IPV6_SADDR_RULE_SCOPE,
1296         IPV6_SADDR_RULE_PREFERRED,
1297 #ifdef CONFIG_IPV6_MIP6
1298         IPV6_SADDR_RULE_HOA,
1299 #endif
1300         IPV6_SADDR_RULE_OIF,
1301         IPV6_SADDR_RULE_LABEL,
1302         IPV6_SADDR_RULE_PRIVACY,
1303         IPV6_SADDR_RULE_ORCHID,
1304         IPV6_SADDR_RULE_PREFIX,
1305 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1306         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1307 #endif
1308         IPV6_SADDR_RULE_MAX
1309 };
1310
1311 struct ipv6_saddr_score {
1312         int                     rule;
1313         int                     addr_type;
1314         struct inet6_ifaddr     *ifa;
1315         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1316         int                     scopedist;
1317         int                     matchlen;
1318 };
1319
1320 struct ipv6_saddr_dst {
1321         const struct in6_addr *addr;
1322         int ifindex;
1323         int scope;
1324         int label;
1325         unsigned int prefs;
1326 };
1327
1328 static inline int ipv6_saddr_preferred(int type)
1329 {
1330         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1331                 return 1;
1332         return 0;
1333 }
1334
1335 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1336 {
1337 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1338         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1339 #else
1340         return false;
1341 #endif
1342 }
1343
1344 static int ipv6_get_saddr_eval(struct net *net,
1345                                struct ipv6_saddr_score *score,
1346                                struct ipv6_saddr_dst *dst,
1347                                int i)
1348 {
1349         int ret;
1350
1351         if (i <= score->rule) {
1352                 switch (i) {
1353                 case IPV6_SADDR_RULE_SCOPE:
1354                         ret = score->scopedist;
1355                         break;
1356                 case IPV6_SADDR_RULE_PREFIX:
1357                         ret = score->matchlen;
1358                         break;
1359                 default:
1360                         ret = !!test_bit(i, score->scorebits);
1361                 }
1362                 goto out;
1363         }
1364
1365         switch (i) {
1366         case IPV6_SADDR_RULE_INIT:
1367                 /* Rule 0: remember if hiscore is not ready yet */
1368                 ret = !!score->ifa;
1369                 break;
1370         case IPV6_SADDR_RULE_LOCAL:
1371                 /* Rule 1: Prefer same address */
1372                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1373                 break;
1374         case IPV6_SADDR_RULE_SCOPE:
1375                 /* Rule 2: Prefer appropriate scope
1376                  *
1377                  *      ret
1378                  *       ^
1379                  *    -1 |  d 15
1380                  *    ---+--+-+---> scope
1381                  *       |
1382                  *       |             d is scope of the destination.
1383                  *  B-d  |  \
1384                  *       |   \      <- smaller scope is better if
1385                  *  B-15 |    \        if scope is enough for destination.
1386                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1387                  * d-C-1 | /
1388                  *       |/         <- greater is better
1389                  *   -C  /             if scope is not enough for destination.
1390                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1391                  *
1392                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1393                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1394                  * Assume B = 0 and we get C > 29.
1395                  */
1396                 ret = __ipv6_addr_src_scope(score->addr_type);
1397                 if (ret >= dst->scope)
1398                         ret = -ret;
1399                 else
1400                         ret -= 128;     /* 30 is enough */
1401                 score->scopedist = ret;
1402                 break;
1403         case IPV6_SADDR_RULE_PREFERRED:
1404             {
1405                 /* Rule 3: Avoid deprecated and optimistic addresses */
1406                 u8 avoid = IFA_F_DEPRECATED;
1407
1408                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1409                         avoid |= IFA_F_OPTIMISTIC;
1410                 ret = ipv6_saddr_preferred(score->addr_type) ||
1411                       !(score->ifa->flags & avoid);
1412                 break;
1413             }
1414 #ifdef CONFIG_IPV6_MIP6
1415         case IPV6_SADDR_RULE_HOA:
1416             {
1417                 /* Rule 4: Prefer home address */
1418                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1419                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1420                 break;
1421             }
1422 #endif
1423         case IPV6_SADDR_RULE_OIF:
1424                 /* Rule 5: Prefer outgoing interface */
1425                 ret = (!dst->ifindex ||
1426                        dst->ifindex == score->ifa->idev->dev->ifindex);
1427                 break;
1428         case IPV6_SADDR_RULE_LABEL:
1429                 /* Rule 6: Prefer matching label */
1430                 ret = ipv6_addr_label(net,
1431                                       &score->ifa->addr, score->addr_type,
1432                                       score->ifa->idev->dev->ifindex) == dst->label;
1433                 break;
1434         case IPV6_SADDR_RULE_PRIVACY:
1435             {
1436                 /* Rule 7: Prefer public address
1437                  * Note: prefer temporary address if use_tempaddr >= 2
1438                  */
1439                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1440                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1441                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1442                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1443                 break;
1444             }
1445         case IPV6_SADDR_RULE_ORCHID:
1446                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1447                  *          non-ORCHID vs non-ORCHID
1448                  */
1449                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1450                         ipv6_addr_orchid(dst->addr));
1451                 break;
1452         case IPV6_SADDR_RULE_PREFIX:
1453                 /* Rule 8: Use longest matching prefix */
1454                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1455                 if (ret > score->ifa->prefix_len)
1456                         ret = score->ifa->prefix_len;
1457                 score->matchlen = ret;
1458                 break;
1459 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1460         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1461                 /* Optimistic addresses still have lower precedence than other
1462                  * preferred addresses.
1463                  */
1464                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1465                 break;
1466 #endif
1467         default:
1468                 ret = 0;
1469         }
1470
1471         if (ret)
1472                 __set_bit(i, score->scorebits);
1473         score->rule = i;
1474 out:
1475         return ret;
1476 }
1477
1478 static int __ipv6_dev_get_saddr(struct net *net,
1479                                 struct ipv6_saddr_dst *dst,
1480                                 struct inet6_dev *idev,
1481                                 struct ipv6_saddr_score *scores,
1482                                 int hiscore_idx)
1483 {
1484         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1485
1486         read_lock_bh(&idev->lock);
1487         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1488                 int i;
1489
1490                 /*
1491                  * - Tentative Address (RFC2462 section 5.4)
1492                  *  - A tentative address is not considered
1493                  *    "assigned to an interface" in the traditional
1494                  *    sense, unless it is also flagged as optimistic.
1495                  * - Candidate Source Address (section 4)
1496                  *  - In any case, anycast addresses, multicast
1497                  *    addresses, and the unspecified address MUST
1498                  *    NOT be included in a candidate set.
1499                  */
1500                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1501                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1502                         continue;
1503
1504                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1505
1506                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1507                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1508                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1509                                             idev->dev->name);
1510                         continue;
1511                 }
1512
1513                 score->rule = -1;
1514                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1515
1516                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1517                         int minihiscore, miniscore;
1518
1519                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1520                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1521
1522                         if (minihiscore > miniscore) {
1523                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1524                                     score->scopedist > 0) {
1525                                         /*
1526                                          * special case:
1527                                          * each remaining entry
1528                                          * has too small (not enough)
1529                                          * scope, because ifa entries
1530                                          * are sorted by their scope
1531                                          * values.
1532                                          */
1533                                         goto out;
1534                                 }
1535                                 break;
1536                         } else if (minihiscore < miniscore) {
1537                                 if (hiscore->ifa)
1538                                         in6_ifa_put(hiscore->ifa);
1539
1540                                 in6_ifa_hold(score->ifa);
1541
1542                                 swap(hiscore, score);
1543                                 hiscore_idx = 1 - hiscore_idx;
1544
1545                                 /* restore our iterator */
1546                                 score->ifa = hiscore->ifa;
1547
1548                                 break;
1549                         }
1550                 }
1551         }
1552 out:
1553         read_unlock_bh(&idev->lock);
1554         return hiscore_idx;
1555 }
1556
1557 static int ipv6_get_saddr_master(struct net *net,
1558                                  const struct net_device *dst_dev,
1559                                  const struct net_device *master,
1560                                  struct ipv6_saddr_dst *dst,
1561                                  struct ipv6_saddr_score *scores,
1562                                  int hiscore_idx)
1563 {
1564         struct inet6_dev *idev;
1565
1566         idev = __in6_dev_get(dst_dev);
1567         if (idev)
1568                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1569                                                    scores, hiscore_idx);
1570
1571         idev = __in6_dev_get(master);
1572         if (idev)
1573                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1574                                                    scores, hiscore_idx);
1575
1576         return hiscore_idx;
1577 }
1578
1579 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1580                        const struct in6_addr *daddr, unsigned int prefs,
1581                        struct in6_addr *saddr)
1582 {
1583         struct ipv6_saddr_score scores[2], *hiscore;
1584         struct ipv6_saddr_dst dst;
1585         struct inet6_dev *idev;
1586         struct net_device *dev;
1587         int dst_type;
1588         bool use_oif_addr = false;
1589         int hiscore_idx = 0;
1590
1591         dst_type = __ipv6_addr_type(daddr);
1592         dst.addr = daddr;
1593         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1594         dst.scope = __ipv6_addr_src_scope(dst_type);
1595         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1596         dst.prefs = prefs;
1597
1598         scores[hiscore_idx].rule = -1;
1599         scores[hiscore_idx].ifa = NULL;
1600
1601         rcu_read_lock();
1602
1603         /* Candidate Source Address (section 4)
1604          *  - multicast and link-local destination address,
1605          *    the set of candidate source address MUST only
1606          *    include addresses assigned to interfaces
1607          *    belonging to the same link as the outgoing
1608          *    interface.
1609          * (- For site-local destination addresses, the
1610          *    set of candidate source addresses MUST only
1611          *    include addresses assigned to interfaces
1612          *    belonging to the same site as the outgoing
1613          *    interface.)
1614          *  - "It is RECOMMENDED that the candidate source addresses
1615          *    be the set of unicast addresses assigned to the
1616          *    interface that will be used to send to the destination
1617          *    (the 'outgoing' interface)." (RFC 6724)
1618          */
1619         if (dst_dev) {
1620                 idev = __in6_dev_get(dst_dev);
1621                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1622                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1623                     (idev && idev->cnf.use_oif_addrs_only)) {
1624                         use_oif_addr = true;
1625                 }
1626         }
1627
1628         if (use_oif_addr) {
1629                 if (idev)
1630                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1631         } else {
1632                 const struct net_device *master;
1633                 int master_idx = 0;
1634
1635                 /* if dst_dev exists and is enslaved to an L3 device, then
1636                  * prefer addresses from dst_dev and then the master over
1637                  * any other enslaved devices in the L3 domain.
1638                  */
1639                 master = l3mdev_master_dev_rcu(dst_dev);
1640                 if (master) {
1641                         master_idx = master->ifindex;
1642
1643                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1644                                                             master, &dst,
1645                                                             scores, hiscore_idx);
1646
1647                         if (scores[hiscore_idx].ifa)
1648                                 goto out;
1649                 }
1650
1651                 for_each_netdev_rcu(net, dev) {
1652                         /* only consider addresses on devices in the
1653                          * same L3 domain
1654                          */
1655                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1656                                 continue;
1657                         idev = __in6_dev_get(dev);
1658                         if (!idev)
1659                                 continue;
1660                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1661                 }
1662         }
1663
1664 out:
1665         rcu_read_unlock();
1666
1667         hiscore = &scores[hiscore_idx];
1668         if (!hiscore->ifa)
1669                 return -EADDRNOTAVAIL;
1670
1671         *saddr = hiscore->ifa->addr;
1672         in6_ifa_put(hiscore->ifa);
1673         return 0;
1674 }
1675 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1676
1677 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1678                       u32 banned_flags)
1679 {
1680         struct inet6_ifaddr *ifp;
1681         int err = -EADDRNOTAVAIL;
1682
1683         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1684                 if (ifp->scope > IFA_LINK)
1685                         break;
1686                 if (ifp->scope == IFA_LINK &&
1687                     !(ifp->flags & banned_flags)) {
1688                         *addr = ifp->addr;
1689                         err = 0;
1690                         break;
1691                 }
1692         }
1693         return err;
1694 }
1695
1696 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1697                     u32 banned_flags)
1698 {
1699         struct inet6_dev *idev;
1700         int err = -EADDRNOTAVAIL;
1701
1702         rcu_read_lock();
1703         idev = __in6_dev_get(dev);
1704         if (idev) {
1705                 read_lock_bh(&idev->lock);
1706                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1707                 read_unlock_bh(&idev->lock);
1708         }
1709         rcu_read_unlock();
1710         return err;
1711 }
1712
1713 static int ipv6_count_addresses(struct inet6_dev *idev)
1714 {
1715         int cnt = 0;
1716         struct inet6_ifaddr *ifp;
1717
1718         read_lock_bh(&idev->lock);
1719         list_for_each_entry(ifp, &idev->addr_list, if_list)
1720                 cnt++;
1721         read_unlock_bh(&idev->lock);
1722         return cnt;
1723 }
1724
1725 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1726                   const struct net_device *dev, int strict)
1727 {
1728         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1729 }
1730 EXPORT_SYMBOL(ipv6_chk_addr);
1731
1732 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1733                             const struct net_device *dev, int strict,
1734                             u32 banned_flags)
1735 {
1736         struct inet6_ifaddr *ifp;
1737         unsigned int hash = inet6_addr_hash(addr);
1738         u32 ifp_flags;
1739
1740         rcu_read_lock_bh();
1741         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1742                 if (!net_eq(dev_net(ifp->idev->dev), net))
1743                         continue;
1744                 /* Decouple optimistic from tentative for evaluation here.
1745                  * Ban optimistic addresses explicitly, when required.
1746                  */
1747                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1748                             ? (ifp->flags&~IFA_F_TENTATIVE)
1749                             : ifp->flags;
1750                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1751                     !(ifp_flags&banned_flags) &&
1752                     (!dev || ifp->idev->dev == dev ||
1753                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1754                         rcu_read_unlock_bh();
1755                         return 1;
1756                 }
1757         }
1758
1759         rcu_read_unlock_bh();
1760         return 0;
1761 }
1762 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1763
1764 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1765                                struct net_device *dev)
1766 {
1767         unsigned int hash = inet6_addr_hash(addr);
1768         struct inet6_ifaddr *ifp;
1769
1770         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1771                 if (!net_eq(dev_net(ifp->idev->dev), net))
1772                         continue;
1773                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1774                         if (!dev || ifp->idev->dev == dev)
1775                                 return true;
1776                 }
1777         }
1778         return false;
1779 }
1780
1781 /* Compares an address/prefix_len with addresses on device @dev.
1782  * If one is found it returns true.
1783  */
1784 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1785         const unsigned int prefix_len, struct net_device *dev)
1786 {
1787         struct inet6_dev *idev;
1788         struct inet6_ifaddr *ifa;
1789         bool ret = false;
1790
1791         rcu_read_lock();
1792         idev = __in6_dev_get(dev);
1793         if (idev) {
1794                 read_lock_bh(&idev->lock);
1795                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1796                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1797                         if (ret)
1798                                 break;
1799                 }
1800                 read_unlock_bh(&idev->lock);
1801         }
1802         rcu_read_unlock();
1803
1804         return ret;
1805 }
1806 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1807
1808 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1809 {
1810         struct inet6_dev *idev;
1811         struct inet6_ifaddr *ifa;
1812         int     onlink;
1813
1814         onlink = 0;
1815         rcu_read_lock();
1816         idev = __in6_dev_get(dev);
1817         if (idev) {
1818                 read_lock_bh(&idev->lock);
1819                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1820                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1821                                                    ifa->prefix_len);
1822                         if (onlink)
1823                                 break;
1824                 }
1825                 read_unlock_bh(&idev->lock);
1826         }
1827         rcu_read_unlock();
1828         return onlink;
1829 }
1830 EXPORT_SYMBOL(ipv6_chk_prefix);
1831
1832 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1833                                      struct net_device *dev, int strict)
1834 {
1835         struct inet6_ifaddr *ifp, *result = NULL;
1836         unsigned int hash = inet6_addr_hash(addr);
1837
1838         rcu_read_lock_bh();
1839         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1840                 if (!net_eq(dev_net(ifp->idev->dev), net))
1841                         continue;
1842                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1843                         if (!dev || ifp->idev->dev == dev ||
1844                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1845                                 result = ifp;
1846                                 in6_ifa_hold(ifp);
1847                                 break;
1848                         }
1849                 }
1850         }
1851         rcu_read_unlock_bh();
1852
1853         return result;
1854 }
1855
1856 /* Gets referenced address, destroys ifaddr */
1857
1858 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1859 {
1860         if (dad_failed)
1861                 ifp->flags |= IFA_F_DADFAILED;
1862
1863         if (ifp->flags&IFA_F_PERMANENT) {
1864                 spin_lock_bh(&ifp->lock);
1865                 addrconf_del_dad_work(ifp);
1866                 ifp->flags |= IFA_F_TENTATIVE;
1867                 spin_unlock_bh(&ifp->lock);
1868                 if (dad_failed)
1869                         ipv6_ifa_notify(0, ifp);
1870                 in6_ifa_put(ifp);
1871         } else if (ifp->flags&IFA_F_TEMPORARY) {
1872                 struct inet6_ifaddr *ifpub;
1873                 spin_lock_bh(&ifp->lock);
1874                 ifpub = ifp->ifpub;
1875                 if (ifpub) {
1876                         in6_ifa_hold(ifpub);
1877                         spin_unlock_bh(&ifp->lock);
1878                         ipv6_create_tempaddr(ifpub, ifp);
1879                         in6_ifa_put(ifpub);
1880                 } else {
1881                         spin_unlock_bh(&ifp->lock);
1882                 }
1883                 ipv6_del_addr(ifp);
1884         } else {
1885                 ipv6_del_addr(ifp);
1886         }
1887 }
1888
1889 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1890 {
1891         int err = -ENOENT;
1892
1893         spin_lock_bh(&ifp->lock);
1894         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1895                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1896                 err = 0;
1897         }
1898         spin_unlock_bh(&ifp->lock);
1899
1900         return err;
1901 }
1902
1903 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1904 {
1905         struct inet6_dev *idev = ifp->idev;
1906         struct net *net = dev_net(ifp->idev->dev);
1907
1908         if (addrconf_dad_end(ifp)) {
1909                 in6_ifa_put(ifp);
1910                 return;
1911         }
1912
1913         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1914                              ifp->idev->dev->name, &ifp->addr);
1915
1916         spin_lock_bh(&ifp->lock);
1917
1918         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1919                 int scope = ifp->scope;
1920                 u32 flags = ifp->flags;
1921                 struct in6_addr new_addr;
1922                 struct inet6_ifaddr *ifp2;
1923                 u32 valid_lft, preferred_lft;
1924                 int pfxlen = ifp->prefix_len;
1925                 int retries = ifp->stable_privacy_retry + 1;
1926
1927                 if (retries > net->ipv6.sysctl.idgen_retries) {
1928                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1929                                              ifp->idev->dev->name);
1930                         goto errdad;
1931                 }
1932
1933                 new_addr = ifp->addr;
1934                 if (ipv6_generate_stable_address(&new_addr, retries,
1935                                                  idev))
1936                         goto errdad;
1937
1938                 valid_lft = ifp->valid_lft;
1939                 preferred_lft = ifp->prefered_lft;
1940
1941                 spin_unlock_bh(&ifp->lock);
1942
1943                 if (idev->cnf.max_addresses &&
1944                     ipv6_count_addresses(idev) >=
1945                     idev->cnf.max_addresses)
1946                         goto lock_errdad;
1947
1948                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1949                                      ifp->idev->dev->name);
1950
1951                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1952                                      scope, flags, valid_lft,
1953                                      preferred_lft);
1954                 if (IS_ERR(ifp2))
1955                         goto lock_errdad;
1956
1957                 spin_lock_bh(&ifp2->lock);
1958                 ifp2->stable_privacy_retry = retries;
1959                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1960                 spin_unlock_bh(&ifp2->lock);
1961
1962                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1963                 in6_ifa_put(ifp2);
1964 lock_errdad:
1965                 spin_lock_bh(&ifp->lock);
1966         }
1967
1968 errdad:
1969         /* transition from _POSTDAD to _ERRDAD */
1970         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1971         spin_unlock_bh(&ifp->lock);
1972
1973         addrconf_mod_dad_work(ifp, 0);
1974         in6_ifa_put(ifp);
1975 }
1976
1977 /* Join to solicited addr multicast group.
1978  * caller must hold RTNL */
1979 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1980 {
1981         struct in6_addr maddr;
1982
1983         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1984                 return;
1985
1986         addrconf_addr_solict_mult(addr, &maddr);
1987         ipv6_dev_mc_inc(dev, &maddr);
1988 }
1989
1990 /* caller must hold RTNL */
1991 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1992 {
1993         struct in6_addr maddr;
1994
1995         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1996                 return;
1997
1998         addrconf_addr_solict_mult(addr, &maddr);
1999         __ipv6_dev_mc_dec(idev, &maddr);
2000 }
2001
2002 /* caller must hold RTNL */
2003 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2004 {
2005         struct in6_addr addr;
2006
2007         if (ifp->prefix_len >= 127) /* RFC 6164 */
2008                 return;
2009         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2010         if (ipv6_addr_any(&addr))
2011                 return;
2012         __ipv6_dev_ac_inc(ifp->idev, &addr);
2013 }
2014
2015 /* caller must hold RTNL */
2016 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2017 {
2018         struct in6_addr addr;
2019
2020         if (ifp->prefix_len >= 127) /* RFC 6164 */
2021                 return;
2022         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2023         if (ipv6_addr_any(&addr))
2024                 return;
2025         __ipv6_dev_ac_dec(ifp->idev, &addr);
2026 }
2027
2028 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2029 {
2030         if (dev->addr_len != EUI64_ADDR_LEN)
2031                 return -1;
2032         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2033         eui[0] ^= 2;
2034         return 0;
2035 }
2036
2037 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2038 {
2039         union fwnet_hwaddr *ha;
2040
2041         if (dev->addr_len != FWNET_ALEN)
2042                 return -1;
2043
2044         ha = (union fwnet_hwaddr *)dev->dev_addr;
2045
2046         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2047         eui[0] ^= 2;
2048         return 0;
2049 }
2050
2051 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2052 {
2053         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2054         if (dev->addr_len != ARCNET_ALEN)
2055                 return -1;
2056         memset(eui, 0, 7);
2057         eui[7] = *(u8 *)dev->dev_addr;
2058         return 0;
2059 }
2060
2061 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2062 {
2063         if (dev->addr_len != INFINIBAND_ALEN)
2064                 return -1;
2065         memcpy(eui, dev->dev_addr + 12, 8);
2066         eui[0] |= 2;
2067         return 0;
2068 }
2069
2070 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2071 {
2072         if (addr == 0)
2073                 return -1;
2074         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2075                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2076                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2077                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2078                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2079                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2080         eui[1] = 0;
2081         eui[2] = 0x5E;
2082         eui[3] = 0xFE;
2083         memcpy(eui + 4, &addr, 4);
2084         return 0;
2085 }
2086
2087 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2088 {
2089         if (dev->priv_flags & IFF_ISATAP)
2090                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2091         return -1;
2092 }
2093
2094 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2095 {
2096         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2097 }
2098
2099 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2100 {
2101         memcpy(eui, dev->perm_addr, 3);
2102         memcpy(eui + 5, dev->perm_addr + 3, 3);
2103         eui[3] = 0xFF;
2104         eui[4] = 0xFE;
2105         eui[0] ^= 2;
2106         return 0;
2107 }
2108
2109 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2110 {
2111         switch (dev->type) {
2112         case ARPHRD_ETHER:
2113         case ARPHRD_FDDI:
2114                 return addrconf_ifid_eui48(eui, dev);
2115         case ARPHRD_ARCNET:
2116                 return addrconf_ifid_arcnet(eui, dev);
2117         case ARPHRD_INFINIBAND:
2118                 return addrconf_ifid_infiniband(eui, dev);
2119         case ARPHRD_SIT:
2120                 return addrconf_ifid_sit(eui, dev);
2121         case ARPHRD_IPGRE:
2122                 return addrconf_ifid_gre(eui, dev);
2123         case ARPHRD_6LOWPAN:
2124                 return addrconf_ifid_eui64(eui, dev);
2125         case ARPHRD_IEEE1394:
2126                 return addrconf_ifid_ieee1394(eui, dev);
2127         case ARPHRD_TUNNEL6:
2128                 return addrconf_ifid_ip6tnl(eui, dev);
2129         }
2130         return -1;
2131 }
2132
2133 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2134 {
2135         int err = -1;
2136         struct inet6_ifaddr *ifp;
2137
2138         read_lock_bh(&idev->lock);
2139         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2140                 if (ifp->scope > IFA_LINK)
2141                         break;
2142                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2143                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2144                         err = 0;
2145                         break;
2146                 }
2147         }
2148         read_unlock_bh(&idev->lock);
2149         return err;
2150 }
2151
2152 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2153 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2154 {
2155 regen:
2156         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2157         idev->rndid[0] &= ~0x02;
2158
2159         /*
2160          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2161          * check if generated address is not inappropriate
2162          *
2163          *  - Reserved subnet anycast (RFC 2526)
2164          *      11111101 11....11 1xxxxxxx
2165          *  - ISATAP (RFC4214) 6.1
2166          *      00-00-5E-FE-xx-xx-xx-xx
2167          *  - value 0
2168          *  - XXX: already assigned to an address on the device
2169          */
2170         if (idev->rndid[0] == 0xfd &&
2171             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2172             (idev->rndid[7]&0x80))
2173                 goto regen;
2174         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2175                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2176                         goto regen;
2177                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2178                         goto regen;
2179         }
2180 }
2181
2182 static void ipv6_regen_rndid(unsigned long data)
2183 {
2184         struct inet6_dev *idev = (struct inet6_dev *) data;
2185         unsigned long expires;
2186
2187         rcu_read_lock_bh();
2188         write_lock_bh(&idev->lock);
2189
2190         if (idev->dead)
2191                 goto out;
2192
2193         __ipv6_regen_rndid(idev);
2194
2195         expires = jiffies +
2196                 idev->cnf.temp_prefered_lft * HZ -
2197                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2198                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2199                 idev->cnf.max_desync_factor * HZ;
2200         if (time_before(expires, jiffies)) {
2201                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2202                         __func__, idev->dev->name);
2203                 goto out;
2204         }
2205
2206         if (!mod_timer(&idev->regen_timer, expires))
2207                 in6_dev_hold(idev);
2208
2209 out:
2210         write_unlock_bh(&idev->lock);
2211         rcu_read_unlock_bh();
2212         in6_dev_put(idev);
2213 }
2214
2215 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2216 {
2217         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2218                 __ipv6_regen_rndid(idev);
2219 }
2220
2221 /*
2222  *      Add prefix route.
2223  */
2224
2225 static void
2226 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2227                       unsigned long expires, u32 flags)
2228 {
2229         struct fib6_config cfg = {
2230                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2231                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2232                 .fc_ifindex = dev->ifindex,
2233                 .fc_expires = expires,
2234                 .fc_dst_len = plen,
2235                 .fc_flags = RTF_UP | flags,
2236                 .fc_nlinfo.nl_net = dev_net(dev),
2237                 .fc_protocol = RTPROT_KERNEL,
2238         };
2239
2240         cfg.fc_dst = *pfx;
2241
2242         /* Prevent useless cloning on PtP SIT.
2243            This thing is done here expecting that the whole
2244            class of non-broadcast devices need not cloning.
2245          */
2246 #if IS_ENABLED(CONFIG_IPV6_SIT)
2247         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2248                 cfg.fc_flags |= RTF_NONEXTHOP;
2249 #endif
2250
2251         ip6_route_add(&cfg);
2252 }
2253
2254
2255 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2256                                                   int plen,
2257                                                   const struct net_device *dev,
2258                                                   u32 flags, u32 noflags)
2259 {
2260         struct fib6_node *fn;
2261         struct rt6_info *rt = NULL;
2262         struct fib6_table *table;
2263         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2264
2265         table = fib6_get_table(dev_net(dev), tb_id);
2266         if (!table)
2267                 return NULL;
2268
2269         read_lock_bh(&table->tb6_lock);
2270         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2271         if (!fn)
2272                 goto out;
2273
2274         noflags |= RTF_CACHE;
2275         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2276                 if (rt->dst.dev->ifindex != dev->ifindex)
2277                         continue;
2278                 if ((rt->rt6i_flags & flags) != flags)
2279                         continue;
2280                 if ((rt->rt6i_flags & noflags) != 0)
2281                         continue;
2282                 dst_hold(&rt->dst);
2283                 break;
2284         }
2285 out:
2286         read_unlock_bh(&table->tb6_lock);
2287         return rt;
2288 }
2289
2290
2291 /* Create "default" multicast route to the interface */
2292
2293 static void addrconf_add_mroute(struct net_device *dev)
2294 {
2295         struct fib6_config cfg = {
2296                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2297                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2298                 .fc_ifindex = dev->ifindex,
2299                 .fc_dst_len = 8,
2300                 .fc_flags = RTF_UP,
2301                 .fc_nlinfo.nl_net = dev_net(dev),
2302         };
2303
2304         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2305
2306         ip6_route_add(&cfg);
2307 }
2308
2309 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2310 {
2311         struct inet6_dev *idev;
2312
2313         ASSERT_RTNL();
2314
2315         idev = ipv6_find_idev(dev);
2316         if (!idev)
2317                 return ERR_PTR(-ENOBUFS);
2318
2319         if (idev->cnf.disable_ipv6)
2320                 return ERR_PTR(-EACCES);
2321
2322         /* Add default multicast route */
2323         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2324                 addrconf_add_mroute(dev);
2325
2326         return idev;
2327 }
2328
2329 static void manage_tempaddrs(struct inet6_dev *idev,
2330                              struct inet6_ifaddr *ifp,
2331                              __u32 valid_lft, __u32 prefered_lft,
2332                              bool create, unsigned long now)
2333 {
2334         u32 flags;
2335         struct inet6_ifaddr *ift;
2336
2337         read_lock_bh(&idev->lock);
2338         /* update all temporary addresses in the list */
2339         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2340                 int age, max_valid, max_prefered;
2341
2342                 if (ifp != ift->ifpub)
2343                         continue;
2344
2345                 /* RFC 4941 section 3.3:
2346                  * If a received option will extend the lifetime of a public
2347                  * address, the lifetimes of temporary addresses should
2348                  * be extended, subject to the overall constraint that no
2349                  * temporary addresses should ever remain "valid" or "preferred"
2350                  * for a time longer than (TEMP_VALID_LIFETIME) or
2351                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2352                  */
2353                 age = (now - ift->cstamp) / HZ;
2354                 max_valid = idev->cnf.temp_valid_lft - age;
2355                 if (max_valid < 0)
2356                         max_valid = 0;
2357
2358                 max_prefered = idev->cnf.temp_prefered_lft -
2359                                idev->cnf.max_desync_factor - age;
2360                 if (max_prefered < 0)
2361                         max_prefered = 0;
2362
2363                 if (valid_lft > max_valid)
2364                         valid_lft = max_valid;
2365
2366                 if (prefered_lft > max_prefered)
2367                         prefered_lft = max_prefered;
2368
2369                 spin_lock(&ift->lock);
2370                 flags = ift->flags;
2371                 ift->valid_lft = valid_lft;
2372                 ift->prefered_lft = prefered_lft;
2373                 ift->tstamp = now;
2374                 if (prefered_lft > 0)
2375                         ift->flags &= ~IFA_F_DEPRECATED;
2376
2377                 spin_unlock(&ift->lock);
2378                 if (!(flags&IFA_F_TENTATIVE))
2379                         ipv6_ifa_notify(0, ift);
2380         }
2381
2382         if ((create || list_empty(&idev->tempaddr_list)) &&
2383             idev->cnf.use_tempaddr > 0) {
2384                 /* When a new public address is created as described
2385                  * in [ADDRCONF], also create a new temporary address.
2386                  * Also create a temporary address if it's enabled but
2387                  * no temporary address currently exists.
2388                  */
2389                 read_unlock_bh(&idev->lock);
2390                 ipv6_create_tempaddr(ifp, NULL);
2391         } else {
2392                 read_unlock_bh(&idev->lock);
2393         }
2394 }
2395
2396 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2397 {
2398         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2399                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2400 }
2401
2402 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2403                                  const struct prefix_info *pinfo,
2404                                  struct inet6_dev *in6_dev,
2405                                  const struct in6_addr *addr, int addr_type,
2406                                  u32 addr_flags, bool sllao, bool tokenized,
2407                                  __u32 valid_lft, u32 prefered_lft)
2408 {
2409         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2410         int create = 0, update_lft = 0;
2411
2412         if (!ifp && valid_lft) {
2413                 int max_addresses = in6_dev->cnf.max_addresses;
2414
2415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2416                 if (in6_dev->cnf.optimistic_dad &&
2417                     !net->ipv6.devconf_all->forwarding && sllao)
2418                         addr_flags |= IFA_F_OPTIMISTIC;
2419 #endif
2420
2421                 /* Do not allow to create too much of autoconfigured
2422                  * addresses; this would be too easy way to crash kernel.
2423                  */
2424                 if (!max_addresses ||
2425                     ipv6_count_addresses(in6_dev) < max_addresses)
2426                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2427                                             pinfo->prefix_len,
2428                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2429                                             addr_flags, valid_lft,
2430                                             prefered_lft);
2431
2432                 if (IS_ERR_OR_NULL(ifp))
2433                         return -1;
2434
2435                 update_lft = 0;
2436                 create = 1;
2437                 spin_lock_bh(&ifp->lock);
2438                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2439                 ifp->cstamp = jiffies;
2440                 ifp->tokenized = tokenized;
2441                 spin_unlock_bh(&ifp->lock);
2442                 addrconf_dad_start(ifp);
2443         }
2444
2445         if (ifp) {
2446                 u32 flags;
2447                 unsigned long now;
2448                 u32 stored_lft;
2449
2450                 /* update lifetime (RFC2462 5.5.3 e) */
2451                 spin_lock_bh(&ifp->lock);
2452                 now = jiffies;
2453                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2454                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2455                 else
2456                         stored_lft = 0;
2457                 if (!update_lft && !create && stored_lft) {
2458                         const u32 minimum_lft = min_t(u32,
2459                                 stored_lft, MIN_VALID_LIFETIME);
2460                         valid_lft = max(valid_lft, minimum_lft);
2461
2462                         /* RFC4862 Section 5.5.3e:
2463                          * "Note that the preferred lifetime of the
2464                          *  corresponding address is always reset to
2465                          *  the Preferred Lifetime in the received
2466                          *  Prefix Information option, regardless of
2467                          *  whether the valid lifetime is also reset or
2468                          *  ignored."
2469                          *
2470                          * So we should always update prefered_lft here.
2471                          */
2472                         update_lft = 1;
2473                 }
2474
2475                 if (update_lft) {
2476                         ifp->valid_lft = valid_lft;
2477                         ifp->prefered_lft = prefered_lft;
2478                         ifp->tstamp = now;
2479                         flags = ifp->flags;
2480                         ifp->flags &= ~IFA_F_DEPRECATED;
2481                         spin_unlock_bh(&ifp->lock);
2482
2483                         if (!(flags&IFA_F_TENTATIVE))
2484                                 ipv6_ifa_notify(0, ifp);
2485                 } else
2486                         spin_unlock_bh(&ifp->lock);
2487
2488                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2489                                  create, now);
2490
2491                 in6_ifa_put(ifp);
2492                 addrconf_verify();
2493         }
2494
2495         return 0;
2496 }
2497 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2498
2499 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2500 {
2501         struct prefix_info *pinfo;
2502         __u32 valid_lft;
2503         __u32 prefered_lft;
2504         int addr_type, err;
2505         u32 addr_flags = 0;
2506         struct inet6_dev *in6_dev;
2507         struct net *net = dev_net(dev);
2508
2509         pinfo = (struct prefix_info *) opt;
2510
2511         if (len < sizeof(struct prefix_info)) {
2512                 ADBG("addrconf: prefix option too short\n");
2513                 return;
2514         }
2515
2516         /*
2517          *      Validation checks ([ADDRCONF], page 19)
2518          */
2519
2520         addr_type = ipv6_addr_type(&pinfo->prefix);
2521
2522         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2523                 return;
2524
2525         valid_lft = ntohl(pinfo->valid);
2526         prefered_lft = ntohl(pinfo->prefered);
2527
2528         if (prefered_lft > valid_lft) {
2529                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2530                 return;
2531         }
2532
2533         in6_dev = in6_dev_get(dev);
2534
2535         if (!in6_dev) {
2536                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2537                                     dev->name);
2538                 return;
2539         }
2540
2541         /*
2542          *      Two things going on here:
2543          *      1) Add routes for on-link prefixes
2544          *      2) Configure prefixes with the auto flag set
2545          */
2546
2547         if (pinfo->onlink) {
2548                 struct rt6_info *rt;
2549                 unsigned long rt_expires;
2550
2551                 /* Avoid arithmetic overflow. Really, we could
2552                  * save rt_expires in seconds, likely valid_lft,
2553                  * but it would require division in fib gc, that it
2554                  * not good.
2555                  */
2556                 if (HZ > USER_HZ)
2557                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2558                 else
2559                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2560
2561                 if (addrconf_finite_timeout(rt_expires))
2562                         rt_expires *= HZ;
2563
2564                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2565                                                pinfo->prefix_len,
2566                                                dev,
2567                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2568                                                RTF_GATEWAY | RTF_DEFAULT);
2569
2570                 if (rt) {
2571                         /* Autoconf prefix route */
2572                         if (valid_lft == 0) {
2573                                 ip6_del_rt(rt);
2574                                 rt = NULL;
2575                         } else if (addrconf_finite_timeout(rt_expires)) {
2576                                 /* not infinity */
2577                                 rt6_set_expires(rt, jiffies + rt_expires);
2578                         } else {
2579                                 rt6_clean_expires(rt);
2580                         }
2581                 } else if (valid_lft) {
2582                         clock_t expires = 0;
2583                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2584                         if (addrconf_finite_timeout(rt_expires)) {
2585                                 /* not infinity */
2586                                 flags |= RTF_EXPIRES;
2587                                 expires = jiffies_to_clock_t(rt_expires);
2588                         }
2589                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2590                                               dev, expires, flags);
2591                 }
2592                 ip6_rt_put(rt);
2593         }
2594
2595         /* Try to figure out our local address for this prefix */
2596
2597         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2598                 struct in6_addr addr;
2599                 bool tokenized = false, dev_addr_generated = false;
2600
2601                 if (pinfo->prefix_len == 64) {
2602                         memcpy(&addr, &pinfo->prefix, 8);
2603
2604                         if (!ipv6_addr_any(&in6_dev->token)) {
2605                                 read_lock_bh(&in6_dev->lock);
2606                                 memcpy(addr.s6_addr + 8,
2607                                        in6_dev->token.s6_addr + 8, 8);
2608                                 read_unlock_bh(&in6_dev->lock);
2609                                 tokenized = true;
2610                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2611                                    !ipv6_generate_stable_address(&addr, 0,
2612                                                                  in6_dev)) {
2613                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2614                                 goto ok;
2615                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2616                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2617                                 goto put;
2618                         } else {
2619                                 dev_addr_generated = true;
2620                         }
2621                         goto ok;
2622                 }
2623                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2624                                     pinfo->prefix_len);
2625                 goto put;
2626
2627 ok:
2628                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2629                                                    &addr, addr_type,
2630                                                    addr_flags, sllao,
2631                                                    tokenized, valid_lft,
2632                                                    prefered_lft);
2633                 if (err)
2634                         goto put;
2635
2636                 /* Ignore error case here because previous prefix add addr was
2637                  * successful which will be notified.
2638                  */
2639                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2640                                               addr_type, addr_flags, sllao,
2641                                               tokenized, valid_lft,
2642                                               prefered_lft,
2643                                               dev_addr_generated);
2644         }
2645         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2646 put:
2647         in6_dev_put(in6_dev);
2648 }
2649
2650 /*
2651  *      Set destination address.
2652  *      Special case for SIT interfaces where we create a new "virtual"
2653  *      device.
2654  */
2655 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2656 {
2657         struct in6_ifreq ireq;
2658         struct net_device *dev;
2659         int err = -EINVAL;
2660
2661         rtnl_lock();
2662
2663         err = -EFAULT;
2664         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2665                 goto err_exit;
2666
2667         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2668
2669         err = -ENODEV;
2670         if (!dev)
2671                 goto err_exit;
2672
2673 #if IS_ENABLED(CONFIG_IPV6_SIT)
2674         if (dev->type == ARPHRD_SIT) {
2675                 const struct net_device_ops *ops = dev->netdev_ops;
2676                 struct ifreq ifr;
2677                 struct ip_tunnel_parm p;
2678
2679                 err = -EADDRNOTAVAIL;
2680                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2681                         goto err_exit;
2682
2683                 memset(&p, 0, sizeof(p));
2684                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2685                 p.iph.saddr = 0;
2686                 p.iph.version = 4;
2687                 p.iph.ihl = 5;
2688                 p.iph.protocol = IPPROTO_IPV6;
2689                 p.iph.ttl = 64;
2690                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2691
2692                 if (ops->ndo_do_ioctl) {
2693                         mm_segment_t oldfs = get_fs();
2694
2695                         set_fs(KERNEL_DS);
2696                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2697                         set_fs(oldfs);
2698                 } else
2699                         err = -EOPNOTSUPP;
2700
2701                 if (err == 0) {
2702                         err = -ENOBUFS;
2703                         dev = __dev_get_by_name(net, p.name);
2704                         if (!dev)
2705                                 goto err_exit;
2706                         err = dev_open(dev);
2707                 }
2708         }
2709 #endif
2710
2711 err_exit:
2712         rtnl_unlock();
2713         return err;
2714 }
2715
2716 static int ipv6_mc_config(struct sock *sk, bool join,
2717                           const struct in6_addr *addr, int ifindex)
2718 {
2719         int ret;
2720
2721         ASSERT_RTNL();
2722
2723         lock_sock(sk);
2724         if (join)
2725                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2726         else
2727                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2728         release_sock(sk);
2729
2730         return ret;
2731 }
2732
2733 /*
2734  *      Manual configuration of address on an interface
2735  */
2736 static int inet6_addr_add(struct net *net, int ifindex,
2737                           const struct in6_addr *pfx,
2738                           const struct in6_addr *peer_pfx,
2739                           unsigned int plen, __u32 ifa_flags,
2740                           __u32 prefered_lft, __u32 valid_lft)
2741 {
2742         struct inet6_ifaddr *ifp;
2743         struct inet6_dev *idev;
2744         struct net_device *dev;
2745         unsigned long timeout;
2746         clock_t expires;
2747         int scope;
2748         u32 flags;
2749
2750         ASSERT_RTNL();
2751
2752         if (plen > 128)
2753                 return -EINVAL;
2754
2755         /* check the lifetime */
2756         if (!valid_lft || prefered_lft > valid_lft)
2757                 return -EINVAL;
2758
2759         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2760                 return -EINVAL;
2761
2762         dev = __dev_get_by_index(net, ifindex);
2763         if (!dev)
2764                 return -ENODEV;
2765
2766         idev = addrconf_add_dev(dev);
2767         if (IS_ERR(idev))
2768                 return PTR_ERR(idev);
2769
2770         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2771                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2772                                          true, pfx, ifindex);
2773
2774                 if (ret < 0)
2775                         return ret;
2776         }
2777
2778         scope = ipv6_addr_scope(pfx);
2779
2780         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2781         if (addrconf_finite_timeout(timeout)) {
2782                 expires = jiffies_to_clock_t(timeout * HZ);
2783                 valid_lft = timeout;
2784                 flags = RTF_EXPIRES;
2785         } else {
2786                 expires = 0;
2787                 flags = 0;
2788                 ifa_flags |= IFA_F_PERMANENT;
2789         }
2790
2791         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2792         if (addrconf_finite_timeout(timeout)) {
2793                 if (timeout == 0)
2794                         ifa_flags |= IFA_F_DEPRECATED;
2795                 prefered_lft = timeout;
2796         }
2797
2798         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2799                             valid_lft, prefered_lft);
2800
2801         if (!IS_ERR(ifp)) {
2802                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2803                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2804                                               expires, flags);
2805                 }
2806
2807                 /*
2808                  * Note that section 3.1 of RFC 4429 indicates
2809                  * that the Optimistic flag should not be set for
2810                  * manually configured addresses
2811                  */
2812                 addrconf_dad_start(ifp);
2813                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2814                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2815                                          true, jiffies);
2816                 in6_ifa_put(ifp);
2817                 addrconf_verify_rtnl();
2818                 return 0;
2819         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2820                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2821                                false, pfx, ifindex);
2822         }
2823
2824         return PTR_ERR(ifp);
2825 }
2826
2827 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2828                           const struct in6_addr *pfx, unsigned int plen)
2829 {
2830         struct inet6_ifaddr *ifp;
2831         struct inet6_dev *idev;
2832         struct net_device *dev;
2833
2834         if (plen > 128)
2835                 return -EINVAL;
2836
2837         dev = __dev_get_by_index(net, ifindex);
2838         if (!dev)
2839                 return -ENODEV;
2840
2841         idev = __in6_dev_get(dev);
2842         if (!idev)
2843                 return -ENXIO;
2844
2845         read_lock_bh(&idev->lock);
2846         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2847                 if (ifp->prefix_len == plen &&
2848                     ipv6_addr_equal(pfx, &ifp->addr)) {
2849                         in6_ifa_hold(ifp);
2850                         read_unlock_bh(&idev->lock);
2851
2852                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2853                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2854                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2855                                                  jiffies);
2856                         ipv6_del_addr(ifp);
2857                         addrconf_verify_rtnl();
2858                         if (ipv6_addr_is_multicast(pfx)) {
2859                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2860                                                false, pfx, dev->ifindex);
2861                         }
2862                         return 0;
2863                 }
2864         }
2865         read_unlock_bh(&idev->lock);
2866         return -EADDRNOTAVAIL;
2867 }
2868
2869
2870 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2871 {
2872         struct in6_ifreq ireq;
2873         int err;
2874
2875         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2876                 return -EPERM;
2877
2878         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2879                 return -EFAULT;
2880
2881         rtnl_lock();
2882         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2883                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2884                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2885         rtnl_unlock();
2886         return err;
2887 }
2888
2889 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2890 {
2891         struct in6_ifreq ireq;
2892         int err;
2893
2894         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2895                 return -EPERM;
2896
2897         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2898                 return -EFAULT;
2899
2900         rtnl_lock();
2901         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2902                              ireq.ifr6_prefixlen);
2903         rtnl_unlock();
2904         return err;
2905 }
2906
2907 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2908                      int plen, int scope)
2909 {
2910         struct inet6_ifaddr *ifp;
2911
2912         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2913                             scope, IFA_F_PERMANENT,
2914                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2915         if (!IS_ERR(ifp)) {
2916                 spin_lock_bh(&ifp->lock);
2917                 ifp->flags &= ~IFA_F_TENTATIVE;
2918                 spin_unlock_bh(&ifp->lock);
2919                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2920                 in6_ifa_put(ifp);
2921         }
2922 }
2923
2924 #if IS_ENABLED(CONFIG_IPV6_SIT)
2925 static void sit_add_v4_addrs(struct inet6_dev *idev)
2926 {
2927         struct in6_addr addr;
2928         struct net_device *dev;
2929         struct net *net = dev_net(idev->dev);
2930         int scope, plen;
2931         u32 pflags = 0;
2932
2933         ASSERT_RTNL();
2934
2935         memset(&addr, 0, sizeof(struct in6_addr));
2936         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2937
2938         if (idev->dev->flags&IFF_POINTOPOINT) {
2939                 addr.s6_addr32[0] = htonl(0xfe800000);
2940                 scope = IFA_LINK;
2941                 plen = 64;
2942         } else {
2943                 scope = IPV6_ADDR_COMPATv4;
2944                 plen = 96;
2945                 pflags |= RTF_NONEXTHOP;
2946         }
2947
2948         if (addr.s6_addr32[3]) {
2949                 add_addr(idev, &addr, plen, scope);
2950                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2951                 return;
2952         }
2953
2954         for_each_netdev(net, dev) {
2955                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2956                 if (in_dev && (dev->flags & IFF_UP)) {
2957                         struct in_ifaddr *ifa;
2958
2959                         int flag = scope;
2960
2961                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2962
2963                                 addr.s6_addr32[3] = ifa->ifa_local;
2964
2965                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2966                                         continue;
2967                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2968                                         if (idev->dev->flags&IFF_POINTOPOINT)
2969                                                 continue;
2970                                         flag |= IFA_HOST;
2971                                 }
2972
2973                                 add_addr(idev, &addr, plen, flag);
2974                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2975                                                       pflags);
2976                         }
2977                 }
2978         }
2979 }
2980 #endif
2981
2982 static void init_loopback(struct net_device *dev)
2983 {
2984         struct inet6_dev  *idev;
2985         struct net_device *sp_dev;
2986         struct inet6_ifaddr *sp_ifa;
2987         struct rt6_info *sp_rt;
2988
2989         /* ::1 */
2990
2991         ASSERT_RTNL();
2992
2993         idev = ipv6_find_idev(dev);
2994         if (!idev) {
2995                 pr_debug("%s: add_dev failed\n", __func__);
2996                 return;
2997         }
2998
2999         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3000
3001         /* Add routes to other interface's IPv6 addresses */
3002         for_each_netdev(dev_net(dev), sp_dev) {
3003                 if (!strcmp(sp_dev->name, dev->name))
3004                         continue;
3005
3006                 idev = __in6_dev_get(sp_dev);
3007                 if (!idev)
3008                         continue;
3009
3010                 read_lock_bh(&idev->lock);
3011                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3012
3013                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3014                                 continue;
3015
3016                         if (sp_ifa->rt) {
3017                                 /* This dst has been added to garbage list when
3018                                  * lo device down, release this obsolete dst and
3019                                  * reallocate a new router for ifa.
3020                                  */
3021                                 if (sp_ifa->rt->dst.obsolete > 0) {
3022                                         ip6_rt_put(sp_ifa->rt);
3023                                         sp_ifa->rt = NULL;
3024                                 } else {
3025                                         continue;
3026                                 }
3027                         }
3028
3029                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3030
3031                         /* Failure cases are ignored */
3032                         if (!IS_ERR(sp_rt)) {
3033                                 sp_ifa->rt = sp_rt;
3034                                 ip6_ins_rt(sp_rt);
3035                         }
3036                 }
3037                 read_unlock_bh(&idev->lock);
3038         }
3039 }
3040
3041 void addrconf_add_linklocal(struct inet6_dev *idev,
3042                             const struct in6_addr *addr, u32 flags)
3043 {
3044         struct inet6_ifaddr *ifp;
3045         u32 addr_flags = flags | IFA_F_PERMANENT;
3046
3047 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3048         if (idev->cnf.optimistic_dad &&
3049             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3050                 addr_flags |= IFA_F_OPTIMISTIC;
3051 #endif
3052
3053         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3054                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3055         if (!IS_ERR(ifp)) {
3056                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3057                 addrconf_dad_start(ifp);
3058                 in6_ifa_put(ifp);
3059         }
3060 }
3061 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3062
3063 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3064 {
3065         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3066                 return true;
3067
3068         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3069             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3070                 return true;
3071
3072         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3073             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3074                 return true;
3075
3076         return false;
3077 }
3078
3079 static int ipv6_generate_stable_address(struct in6_addr *address,
3080                                         u8 dad_count,
3081                                         const struct inet6_dev *idev)
3082 {
3083         static DEFINE_SPINLOCK(lock);
3084         static __u32 digest[SHA_DIGEST_WORDS];
3085         static __u32 workspace[SHA_WORKSPACE_WORDS];
3086
3087         static union {
3088                 char __data[SHA_MESSAGE_BYTES];
3089                 struct {
3090                         struct in6_addr secret;
3091                         __be32 prefix[2];
3092                         unsigned char hwaddr[MAX_ADDR_LEN];
3093                         u8 dad_count;
3094                 } __packed;
3095         } data;
3096
3097         struct in6_addr secret;
3098         struct in6_addr temp;
3099         struct net *net = dev_net(idev->dev);
3100
3101         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3102
3103         if (idev->cnf.stable_secret.initialized)
3104                 secret = idev->cnf.stable_secret.secret;
3105         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3106                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3107         else
3108                 return -1;
3109
3110 retry:
3111         spin_lock_bh(&lock);
3112
3113         sha_init(digest);
3114         memset(&data, 0, sizeof(data));
3115         memset(workspace, 0, sizeof(workspace));
3116         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3117         data.prefix[0] = address->s6_addr32[0];
3118         data.prefix[1] = address->s6_addr32[1];
3119         data.secret = secret;
3120         data.dad_count = dad_count;
3121
3122         sha_transform(digest, data.__data, workspace);
3123
3124         temp = *address;
3125         temp.s6_addr32[2] = (__force __be32)digest[0];
3126         temp.s6_addr32[3] = (__force __be32)digest[1];
3127
3128         spin_unlock_bh(&lock);
3129
3130         if (ipv6_reserved_interfaceid(temp)) {
3131                 dad_count++;
3132                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3133                         return -1;
3134                 goto retry;
3135         }
3136
3137         *address = temp;
3138         return 0;
3139 }
3140
3141 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3142 {
3143         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3144
3145         if (s->initialized)
3146                 return;
3147         s = &idev->cnf.stable_secret;
3148         get_random_bytes(&s->secret, sizeof(s->secret));
3149         s->initialized = true;
3150 }
3151
3152 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3153 {
3154         struct in6_addr addr;
3155
3156         /* no link local addresses on L3 master devices */
3157         if (netif_is_l3_master(idev->dev))
3158                 return;
3159
3160         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3161
3162         switch (idev->addr_gen_mode) {
3163         case IN6_ADDR_GEN_MODE_RANDOM:
3164                 ipv6_gen_mode_random_init(idev);
3165                 /* fallthrough */
3166         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3167                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3168                         addrconf_add_linklocal(idev, &addr,
3169                                                IFA_F_STABLE_PRIVACY);
3170                 else if (prefix_route)
3171                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3172                 break;
3173         case IN6_ADDR_GEN_MODE_EUI64:
3174                 /* addrconf_add_linklocal also adds a prefix_route and we
3175                  * only need to care about prefix routes if ipv6_generate_eui64
3176                  * couldn't generate one.
3177                  */
3178                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3179                         addrconf_add_linklocal(idev, &addr, 0);
3180                 else if (prefix_route)
3181                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3182                 break;
3183         case IN6_ADDR_GEN_MODE_NONE:
3184         default:
3185                 /* will not add any link local address */
3186                 break;
3187         }
3188 }
3189
3190 static void addrconf_dev_config(struct net_device *dev)
3191 {
3192         struct inet6_dev *idev;
3193
3194         ASSERT_RTNL();
3195
3196         if ((dev->type != ARPHRD_ETHER) &&
3197             (dev->type != ARPHRD_FDDI) &&
3198             (dev->type != ARPHRD_ARCNET) &&
3199             (dev->type != ARPHRD_INFINIBAND) &&
3200             (dev->type != ARPHRD_IEEE1394) &&
3201             (dev->type != ARPHRD_TUNNEL6) &&
3202             (dev->type != ARPHRD_6LOWPAN) &&
3203             (dev->type != ARPHRD_NONE)) {
3204                 /* Alas, we support only Ethernet autoconfiguration. */
3205                 return;
3206         }
3207
3208         idev = addrconf_add_dev(dev);
3209         if (IS_ERR(idev))
3210                 return;
3211
3212         /* this device type has no EUI support */
3213         if (dev->type == ARPHRD_NONE &&
3214             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3215                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3216
3217         addrconf_addr_gen(idev, false);
3218 }
3219
3220 #if IS_ENABLED(CONFIG_IPV6_SIT)
3221 static void addrconf_sit_config(struct net_device *dev)
3222 {
3223         struct inet6_dev *idev;
3224
3225         ASSERT_RTNL();
3226
3227         /*
3228          * Configure the tunnel with one of our IPv4
3229          * addresses... we should configure all of
3230          * our v4 addrs in the tunnel
3231          */
3232
3233         idev = ipv6_find_idev(dev);
3234         if (!idev) {
3235                 pr_debug("%s: add_dev failed\n", __func__);
3236                 return;
3237         }
3238
3239         if (dev->priv_flags & IFF_ISATAP) {
3240                 addrconf_addr_gen(idev, false);
3241                 return;
3242         }
3243
3244         sit_add_v4_addrs(idev);
3245
3246         if (dev->flags&IFF_POINTOPOINT)
3247                 addrconf_add_mroute(dev);
3248 }
3249 #endif
3250
3251 #if IS_ENABLED(CONFIG_NET_IPGRE)
3252 static void addrconf_gre_config(struct net_device *dev)
3253 {
3254         struct inet6_dev *idev;
3255
3256         ASSERT_RTNL();
3257
3258         idev = ipv6_find_idev(dev);
3259         if (!idev) {
3260                 pr_debug("%s: add_dev failed\n", __func__);
3261                 return;
3262         }
3263
3264         addrconf_addr_gen(idev, true);
3265         if (dev->flags & IFF_POINTOPOINT)
3266                 addrconf_add_mroute(dev);
3267 }
3268 #endif
3269
3270 static int fixup_permanent_addr(struct inet6_dev *idev,
3271                                 struct inet6_ifaddr *ifp)
3272 {
3273         if (!ifp->rt) {
3274                 struct rt6_info *rt;
3275
3276                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3277                 if (unlikely(IS_ERR(rt)))
3278                         return PTR_ERR(rt);
3279
3280                 ifp->rt = rt;
3281         }
3282
3283         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3284                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3285                                       idev->dev, 0, 0);
3286         }
3287
3288         addrconf_dad_start(ifp);
3289
3290         return 0;
3291 }
3292
3293 static void addrconf_permanent_addr(struct net_device *dev)
3294 {
3295         struct inet6_ifaddr *ifp, *tmp;
3296         struct inet6_dev *idev;
3297
3298         idev = __in6_dev_get(dev);
3299         if (!idev)
3300                 return;
3301
3302         write_lock_bh(&idev->lock);
3303
3304         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3305                 if ((ifp->flags & IFA_F_PERMANENT) &&
3306                     fixup_permanent_addr(idev, ifp) < 0) {
3307                         write_unlock_bh(&idev->lock);
3308                         ipv6_del_addr(ifp);
3309                         write_lock_bh(&idev->lock);
3310
3311                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3312                                              idev->dev->name, &ifp->addr);
3313                 }
3314         }
3315
3316         write_unlock_bh(&idev->lock);
3317 }
3318
3319 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3320                            void *ptr)
3321 {
3322         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3323         struct netdev_notifier_changeupper_info *info;
3324         struct inet6_dev *idev = __in6_dev_get(dev);
3325         int run_pending = 0;
3326         int err;
3327
3328         switch (event) {
3329         case NETDEV_REGISTER:
3330                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3331                         idev = ipv6_add_dev(dev);
3332                         if (IS_ERR(idev))
3333                                 return notifier_from_errno(PTR_ERR(idev));
3334                 }
3335                 break;
3336
3337         case NETDEV_CHANGEMTU:
3338                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3339                 if (dev->mtu < IPV6_MIN_MTU) {
3340                         addrconf_ifdown(dev, 1);
3341                         break;
3342                 }
3343
3344                 if (idev) {
3345                         rt6_mtu_change(dev, dev->mtu);
3346                         idev->cnf.mtu6 = dev->mtu;
3347                         break;
3348                 }
3349
3350                 /* allocate new idev */
3351                 idev = ipv6_add_dev(dev);
3352                 if (IS_ERR(idev))
3353                         break;
3354
3355                 /* device is still not ready */
3356                 if (!(idev->if_flags & IF_READY))
3357                         break;
3358
3359                 run_pending = 1;
3360
3361                 /* fall through */
3362
3363         case NETDEV_UP:
3364         case NETDEV_CHANGE:
3365                 if (dev->flags & IFF_SLAVE)
3366                         break;
3367
3368                 if (idev && idev->cnf.disable_ipv6)
3369                         break;
3370
3371                 if (event == NETDEV_UP) {
3372                         /* restore routes for permanent addresses */
3373                         addrconf_permanent_addr(dev);
3374
3375                         if (!addrconf_qdisc_ok(dev)) {
3376                                 /* device is not ready yet. */
3377                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3378                                         dev->name);
3379                                 break;
3380                         }
3381
3382                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3383                                 idev = ipv6_add_dev(dev);
3384
3385                         if (!IS_ERR_OR_NULL(idev)) {
3386                                 idev->if_flags |= IF_READY;
3387                                 run_pending = 1;
3388                         }
3389                 } else if (event == NETDEV_CHANGE) {
3390                         if (!addrconf_qdisc_ok(dev)) {
3391                                 /* device is still not ready. */
3392                                 break;
3393                         }
3394
3395                         if (idev) {
3396                                 if (idev->if_flags & IF_READY)
3397                                         /* device is already configured. */
3398                                         break;
3399                                 idev->if_flags |= IF_READY;
3400                         }
3401
3402                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3403                                 dev->name);
3404
3405                         run_pending = 1;
3406                 }
3407
3408                 switch (dev->type) {
3409 #if IS_ENABLED(CONFIG_IPV6_SIT)
3410                 case ARPHRD_SIT:
3411                         addrconf_sit_config(dev);
3412                         break;
3413 #endif
3414 #if IS_ENABLED(CONFIG_NET_IPGRE)
3415                 case ARPHRD_IPGRE:
3416                         addrconf_gre_config(dev);
3417                         break;
3418 #endif
3419                 case ARPHRD_LOOPBACK:
3420                         init_loopback(dev);
3421                         break;
3422
3423                 default:
3424                         addrconf_dev_config(dev);
3425                         break;
3426                 }
3427
3428                 if (!IS_ERR_OR_NULL(idev)) {
3429                         if (run_pending)
3430                                 addrconf_dad_run(idev);
3431
3432                         /*
3433                          * If the MTU changed during the interface down,
3434                          * when the interface up, the changed MTU must be
3435                          * reflected in the idev as well as routers.
3436                          */
3437                         if (idev->cnf.mtu6 != dev->mtu &&
3438                             dev->mtu >= IPV6_MIN_MTU) {
3439                                 rt6_mtu_change(dev, dev->mtu);
3440                                 idev->cnf.mtu6 = dev->mtu;
3441                         }
3442                         idev->tstamp = jiffies;
3443                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3444
3445                         /*
3446                          * If the changed mtu during down is lower than
3447                          * IPV6_MIN_MTU stop IPv6 on this interface.
3448                          */
3449                         if (dev->mtu < IPV6_MIN_MTU)
3450                                 addrconf_ifdown(dev, 1);
3451                 }
3452                 break;
3453
3454         case NETDEV_DOWN:
3455         case NETDEV_UNREGISTER:
3456                 /*
3457                  *      Remove all addresses from this interface.
3458                  */
3459                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3460                 break;
3461
3462         case NETDEV_CHANGENAME:
3463                 if (idev) {
3464                         snmp6_unregister_dev(idev);
3465                         addrconf_sysctl_unregister(idev);
3466                         err = addrconf_sysctl_register(idev);
3467                         if (err)
3468                                 return notifier_from_errno(err);
3469                         err = snmp6_register_dev(idev);
3470                         if (err) {
3471                                 addrconf_sysctl_unregister(idev);
3472                                 return notifier_from_errno(err);
3473                         }
3474                 }
3475                 break;
3476
3477         case NETDEV_PRE_TYPE_CHANGE:
3478         case NETDEV_POST_TYPE_CHANGE:
3479                 if (idev)
3480                         addrconf_type_change(dev, event);
3481                 break;
3482
3483         case NETDEV_CHANGEUPPER:
3484                 info = ptr;
3485
3486                 /* flush all routes if dev is linked to or unlinked from
3487                  * an L3 master device (e.g., VRF)
3488                  */
3489                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3490                         addrconf_ifdown(dev, 0);
3491         }
3492
3493         return NOTIFY_OK;
3494 }
3495
3496 /*
3497  *      addrconf module should be notified of a device going up
3498  */
3499 static struct notifier_block ipv6_dev_notf = {
3500         .notifier_call = addrconf_notify,
3501 };
3502
3503 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3504 {
3505         struct inet6_dev *idev;
3506         ASSERT_RTNL();
3507
3508         idev = __in6_dev_get(dev);
3509
3510         if (event == NETDEV_POST_TYPE_CHANGE)
3511                 ipv6_mc_remap(idev);
3512         else if (event == NETDEV_PRE_TYPE_CHANGE)
3513                 ipv6_mc_unmap(idev);
3514 }
3515
3516 static bool addr_is_local(const struct in6_addr *addr)
3517 {
3518         return ipv6_addr_type(addr) &
3519                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3520 }
3521
3522 static int addrconf_ifdown(struct net_device *dev, int how)
3523 {
3524         struct net *net = dev_net(dev);
3525         struct inet6_dev *idev;
3526         struct inet6_ifaddr *ifa, *tmp;
3527         struct list_head del_list;
3528         int _keep_addr;
3529         bool keep_addr;
3530         int state, i;
3531
3532         ASSERT_RTNL();
3533
3534         rt6_ifdown(net, dev);
3535         neigh_ifdown(&nd_tbl, dev);
3536
3537         idev = __in6_dev_get(dev);
3538         if (!idev)
3539                 return -ENODEV;
3540
3541         /*
3542          * Step 1: remove reference to ipv6 device from parent device.
3543          *         Do not dev_put!
3544          */
3545         if (how) {
3546                 idev->dead = 1;
3547
3548                 /* protected by rtnl_lock */
3549                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3550
3551                 /* Step 1.5: remove snmp6 entry */
3552                 snmp6_unregister_dev(idev);
3553
3554         }
3555
3556         /* aggregate the system setting and interface setting */
3557         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3558         if (!_keep_addr)
3559                 _keep_addr = idev->cnf.keep_addr_on_down;
3560
3561         /* combine the user config with event to determine if permanent
3562          * addresses are to be removed from address hash table
3563          */
3564         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3565
3566         /* Step 2: clear hash table */
3567         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3568                 struct hlist_head *h = &inet6_addr_lst[i];
3569
3570                 spin_lock_bh(&addrconf_hash_lock);
3571 restart:
3572                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3573                         if (ifa->idev == idev) {
3574                                 addrconf_del_dad_work(ifa);
3575                                 /* combined flag + permanent flag decide if
3576                                  * address is retained on a down event
3577                                  */
3578                                 if (!keep_addr ||
3579                                     !(ifa->flags & IFA_F_PERMANENT) ||
3580                                     addr_is_local(&ifa->addr)) {
3581                                         hlist_del_init_rcu(&ifa->addr_lst);
3582                                         goto restart;
3583                                 }
3584                         }
3585                 }
3586                 spin_unlock_bh(&addrconf_hash_lock);
3587         }
3588
3589         write_lock_bh(&idev->lock);
3590
3591         addrconf_del_rs_timer(idev);
3592
3593         /* Step 2: clear flags for stateless addrconf */
3594         if (!how)
3595                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3596
3597         if (how && del_timer(&idev->regen_timer))
3598                 in6_dev_put(idev);
3599
3600         /* Step 3: clear tempaddr list */
3601         while (!list_empty(&idev->tempaddr_list)) {
3602                 ifa = list_first_entry(&idev->tempaddr_list,
3603                                        struct inet6_ifaddr, tmp_list);
3604                 list_del(&ifa->tmp_list);
3605                 write_unlock_bh(&idev->lock);
3606                 spin_lock_bh(&ifa->lock);
3607
3608                 if (ifa->ifpub) {
3609                         in6_ifa_put(ifa->ifpub);
3610                         ifa->ifpub = NULL;
3611                 }
3612                 spin_unlock_bh(&ifa->lock);
3613                 in6_ifa_put(ifa);
3614                 write_lock_bh(&idev->lock);
3615         }
3616
3617         /* re-combine the user config with event to determine if permanent
3618          * addresses are to be removed from the interface list
3619          */
3620         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3621
3622         INIT_LIST_HEAD(&del_list);
3623         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3624                 struct rt6_info *rt = NULL;
3625
3626                 addrconf_del_dad_work(ifa);
3627
3628                 write_unlock_bh(&idev->lock);
3629                 spin_lock_bh(&ifa->lock);
3630
3631                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3632                     !addr_is_local(&ifa->addr)) {
3633                         /* set state to skip the notifier below */
3634                         state = INET6_IFADDR_STATE_DEAD;
3635                         ifa->state = 0;
3636                         if (!(ifa->flags & IFA_F_NODAD))
3637                                 ifa->flags |= IFA_F_TENTATIVE;
3638
3639                         rt = ifa->rt;
3640                         ifa->rt = NULL;
3641                 } else {
3642                         state = ifa->state;
3643                         ifa->state = INET6_IFADDR_STATE_DEAD;
3644
3645                         list_move(&ifa->if_list, &del_list);
3646                 }
3647
3648                 spin_unlock_bh(&ifa->lock);
3649
3650                 if (rt)
3651                         ip6_del_rt(rt);
3652
3653                 if (state != INET6_IFADDR_STATE_DEAD) {
3654                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3655                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3656                 } else {
3657                         if (idev->cnf.forwarding)
3658                                 addrconf_leave_anycast(ifa);
3659                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3660                 }
3661
3662                 write_lock_bh(&idev->lock);
3663         }
3664
3665         write_unlock_bh(&idev->lock);
3666
3667         /* now clean up addresses to be removed */
3668         while (!list_empty(&del_list)) {
3669                 ifa = list_first_entry(&del_list,
3670                                        struct inet6_ifaddr, if_list);
3671                 list_del(&ifa->if_list);
3672
3673                 in6_ifa_put(ifa);
3674         }
3675
3676         /* Step 5: Discard anycast and multicast list */
3677         if (how) {
3678                 ipv6_ac_destroy_dev(idev);
3679                 ipv6_mc_destroy_dev(idev);
3680         } else {
3681                 ipv6_mc_down(idev);
3682         }
3683
3684         idev->tstamp = jiffies;
3685
3686         /* Last: Shot the device (if unregistered) */
3687         if (how) {
3688                 addrconf_sysctl_unregister(idev);
3689                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3690                 neigh_ifdown(&nd_tbl, dev);
3691                 in6_dev_put(idev);
3692         }
3693         return 0;
3694 }
3695
3696 static void addrconf_rs_timer(unsigned long data)
3697 {
3698         struct inet6_dev *idev = (struct inet6_dev *)data;
3699         struct net_device *dev = idev->dev;
3700         struct in6_addr lladdr;
3701
3702         write_lock(&idev->lock);
3703         if (idev->dead || !(idev->if_flags & IF_READY))
3704                 goto out;
3705
3706         if (!ipv6_accept_ra(idev))
3707                 goto out;
3708
3709         /* Announcement received after solicitation was sent */
3710         if (idev->if_flags & IF_RA_RCVD)
3711                 goto out;
3712
3713         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3714                 write_unlock(&idev->lock);
3715                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3716                         ndisc_send_rs(dev, &lladdr,
3717                                       &in6addr_linklocal_allrouters);
3718                 else
3719                         goto put;
3720
3721                 write_lock(&idev->lock);
3722                 idev->rs_interval = rfc3315_s14_backoff_update(
3723                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3724                 /* The wait after the last probe can be shorter */
3725                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3726                                              idev->cnf.rtr_solicits) ?
3727                                       idev->cnf.rtr_solicit_delay :
3728                                       idev->rs_interval);
3729         } else {
3730                 /*
3731                  * Note: we do not support deprecated "all on-link"
3732                  * assumption any longer.
3733                  */
3734                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3735         }
3736
3737 out:
3738         write_unlock(&idev->lock);
3739 put:
3740         in6_dev_put(idev);
3741 }
3742
3743 /*
3744  *      Duplicate Address Detection
3745  */
3746 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3747 {
3748         unsigned long rand_num;
3749         struct inet6_dev *idev = ifp->idev;
3750
3751         if (ifp->flags & IFA_F_OPTIMISTIC)
3752                 rand_num = 0;
3753         else
3754                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3755
3756         ifp->dad_probes = idev->cnf.dad_transmits;
3757         addrconf_mod_dad_work(ifp, rand_num);
3758 }
3759
3760 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3761 {
3762         struct inet6_dev *idev = ifp->idev;
3763         struct net_device *dev = idev->dev;
3764         bool notify = false;
3765
3766         addrconf_join_solict(dev, &ifp->addr);
3767
3768         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3769
3770         read_lock_bh(&idev->lock);
3771         spin_lock(&ifp->lock);
3772         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3773                 goto out;
3774
3775         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3776             idev->cnf.accept_dad < 1 ||
3777             !(ifp->flags&IFA_F_TENTATIVE) ||
3778             ifp->flags & IFA_F_NODAD) {
3779                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3780                 spin_unlock(&ifp->lock);
3781                 read_unlock_bh(&idev->lock);
3782
3783                 addrconf_dad_completed(ifp);
3784                 return;
3785         }
3786
3787         if (!(idev->if_flags & IF_READY)) {
3788                 spin_unlock(&ifp->lock);
3789                 read_unlock_bh(&idev->lock);
3790                 /*
3791                  * If the device is not ready:
3792                  * - keep it tentative if it is a permanent address.
3793                  * - otherwise, kill it.
3794                  */
3795                 in6_ifa_hold(ifp);
3796                 addrconf_dad_stop(ifp, 0);
3797                 return;
3798         }
3799
3800         /*
3801          * Optimistic nodes can start receiving
3802          * Frames right away
3803          */
3804         if (ifp->flags & IFA_F_OPTIMISTIC) {
3805                 ip6_ins_rt(ifp->rt);
3806                 if (ipv6_use_optimistic_addr(idev)) {
3807                         /* Because optimistic nodes can use this address,
3808                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3809                          */
3810                         notify = true;
3811                 }
3812         }
3813
3814         addrconf_dad_kick(ifp);
3815 out:
3816         spin_unlock(&ifp->lock);
3817         read_unlock_bh(&idev->lock);
3818         if (notify)
3819                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3820 }
3821
3822 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3823 {
3824         bool begin_dad = false;
3825
3826         spin_lock_bh(&ifp->lock);
3827         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3828                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3829                 begin_dad = true;
3830         }
3831         spin_unlock_bh(&ifp->lock);
3832
3833         if (begin_dad)
3834                 addrconf_mod_dad_work(ifp, 0);
3835 }
3836
3837 static void addrconf_dad_work(struct work_struct *w)
3838 {
3839         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3840                                                 struct inet6_ifaddr,
3841                                                 dad_work);
3842         struct inet6_dev *idev = ifp->idev;
3843         struct in6_addr mcaddr;
3844         bool disable_ipv6 = false;
3845
3846         enum {
3847                 DAD_PROCESS,
3848                 DAD_BEGIN,
3849                 DAD_ABORT,
3850         } action = DAD_PROCESS;
3851
3852         rtnl_lock();
3853
3854         spin_lock_bh(&ifp->lock);
3855         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3856                 action = DAD_BEGIN;
3857                 ifp->state = INET6_IFADDR_STATE_DAD;
3858         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3859                 action = DAD_ABORT;
3860                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3861
3862                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3863                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3864                         struct in6_addr addr;
3865
3866                         addr.s6_addr32[0] = htonl(0xfe800000);
3867                         addr.s6_addr32[1] = 0;
3868
3869                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3870                             ipv6_addr_equal(&ifp->addr, &addr)) {
3871                                 /* DAD failed for link-local based on MAC */
3872                                 idev->cnf.disable_ipv6 = 1;
3873
3874                                 pr_info("%s: IPv6 being disabled!\n",
3875                                         ifp->idev->dev->name);
3876                                 disable_ipv6 = true;
3877                         }
3878                 }
3879         }
3880         spin_unlock_bh(&ifp->lock);
3881
3882         if (action == DAD_BEGIN) {
3883                 addrconf_dad_begin(ifp);
3884                 goto out;
3885         } else if (action == DAD_ABORT) {
3886                 in6_ifa_hold(ifp);
3887                 addrconf_dad_stop(ifp, 1);
3888                 if (disable_ipv6)
3889                         addrconf_ifdown(idev->dev, 0);
3890                 goto out;
3891         }
3892
3893         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3894                 goto out;
3895
3896         write_lock_bh(&idev->lock);
3897         if (idev->dead || !(idev->if_flags & IF_READY)) {
3898                 write_unlock_bh(&idev->lock);
3899                 goto out;
3900         }
3901
3902         spin_lock(&ifp->lock);
3903         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3904                 spin_unlock(&ifp->lock);
3905                 write_unlock_bh(&idev->lock);
3906                 goto out;
3907         }
3908
3909         if (ifp->dad_probes == 0) {
3910                 /*
3911                  * DAD was successful
3912                  */
3913
3914                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3915                 spin_unlock(&ifp->lock);
3916                 write_unlock_bh(&idev->lock);
3917
3918                 addrconf_dad_completed(ifp);
3919
3920                 goto out;
3921         }
3922
3923         ifp->dad_probes--;
3924         addrconf_mod_dad_work(ifp,
3925                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3926         spin_unlock(&ifp->lock);
3927         write_unlock_bh(&idev->lock);
3928
3929         /* send a neighbour solicitation for our addr */
3930         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3931         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3932 out:
3933         in6_ifa_put(ifp);
3934         rtnl_unlock();
3935 }
3936
3937 /* ifp->idev must be at least read locked */
3938 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3939 {
3940         struct inet6_ifaddr *ifpiter;
3941         struct inet6_dev *idev = ifp->idev;
3942
3943         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3944                 if (ifpiter->scope > IFA_LINK)
3945                         break;
3946                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3947                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3948                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3949                     IFA_F_PERMANENT)
3950                         return false;
3951         }
3952         return true;
3953 }
3954
3955 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3956 {
3957         struct net_device *dev = ifp->idev->dev;
3958         struct in6_addr lladdr;
3959         bool send_rs, send_mld;
3960
3961         addrconf_del_dad_work(ifp);
3962
3963         /*
3964          *      Configure the address for reception. Now it is valid.
3965          */
3966
3967         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3968
3969         /* If added prefix is link local and we are prepared to process
3970            router advertisements, start sending router solicitations.
3971          */
3972
3973         read_lock_bh(&ifp->idev->lock);
3974         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3975         send_rs = send_mld &&
3976                   ipv6_accept_ra(ifp->idev) &&
3977                   ifp->idev->cnf.rtr_solicits != 0 &&
3978                   (dev->flags&IFF_LOOPBACK) == 0;
3979         read_unlock_bh(&ifp->idev->lock);
3980
3981         /* While dad is in progress mld report's source address is in6_addrany.
3982          * Resend with proper ll now.
3983          */
3984         if (send_mld)
3985                 ipv6_mc_dad_complete(ifp->idev);
3986
3987         if (send_rs) {
3988                 /*
3989                  *      If a host as already performed a random delay
3990                  *      [...] as part of DAD [...] there is no need
3991                  *      to delay again before sending the first RS
3992                  */
3993                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3994                         return;
3995                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3996
3997                 write_lock_bh(&ifp->idev->lock);
3998                 spin_lock(&ifp->lock);
3999                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4000                         ifp->idev->cnf.rtr_solicit_interval);
4001                 ifp->idev->rs_probes = 1;
4002                 ifp->idev->if_flags |= IF_RS_SENT;
4003                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4004                 spin_unlock(&ifp->lock);
4005                 write_unlock_bh(&ifp->idev->lock);
4006         }
4007 }
4008
4009 static void addrconf_dad_run(struct inet6_dev *idev)
4010 {
4011         struct inet6_ifaddr *ifp;
4012
4013         read_lock_bh(&idev->lock);
4014         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4015                 spin_lock(&ifp->lock);
4016                 if (ifp->flags & IFA_F_TENTATIVE &&
4017                     ifp->state == INET6_IFADDR_STATE_DAD)
4018                         addrconf_dad_kick(ifp);
4019                 spin_unlock(&ifp->lock);
4020         }
4021         read_unlock_bh(&idev->lock);
4022 }
4023
4024 #ifdef CONFIG_PROC_FS
4025 struct if6_iter_state {
4026         struct seq_net_private p;
4027         int bucket;
4028         int offset;
4029 };
4030
4031 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4032 {
4033         struct inet6_ifaddr *ifa = NULL;
4034         struct if6_iter_state *state = seq->private;
4035         struct net *net = seq_file_net(seq);
4036         int p = 0;
4037
4038         /* initial bucket if pos is 0 */
4039         if (pos == 0) {
4040                 state->bucket = 0;
4041                 state->offset = 0;
4042         }
4043
4044         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4045                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4046                                          addr_lst) {
4047                         if (!net_eq(dev_net(ifa->idev->dev), net))
4048                                 continue;
4049                         /* sync with offset */
4050                         if (p < state->offset) {
4051                                 p++;
4052                                 continue;
4053                         }
4054                         state->offset++;
4055                         return ifa;
4056                 }
4057
4058                 /* prepare for next bucket */
4059                 state->offset = 0;
4060                 p = 0;
4061         }
4062         return NULL;
4063 }
4064
4065 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4066                                          struct inet6_ifaddr *ifa)
4067 {
4068         struct if6_iter_state *state = seq->private;
4069         struct net *net = seq_file_net(seq);
4070
4071         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4072                 if (!net_eq(dev_net(ifa->idev->dev), net))
4073                         continue;
4074                 state->offset++;
4075                 return ifa;
4076         }
4077
4078         while (++state->bucket < IN6_ADDR_HSIZE) {
4079                 state->offset = 0;
4080                 hlist_for_each_entry_rcu_bh(ifa,
4081                                      &inet6_addr_lst[state->bucket], addr_lst) {
4082                         if (!net_eq(dev_net(ifa->idev->dev), net))
4083                                 continue;
4084                         state->offset++;
4085                         return ifa;
4086                 }
4087         }
4088
4089         return NULL;
4090 }
4091
4092 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4093         __acquires(rcu_bh)
4094 {
4095         rcu_read_lock_bh();
4096         return if6_get_first(seq, *pos);
4097 }
4098
4099 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4100 {
4101         struct inet6_ifaddr *ifa;
4102
4103         ifa = if6_get_next(seq, v);
4104         ++*pos;
4105         return ifa;
4106 }
4107
4108 static void if6_seq_stop(struct seq_file *seq, void *v)
4109         __releases(rcu_bh)
4110 {
4111         rcu_read_unlock_bh();
4112 }
4113
4114 static int if6_seq_show(struct seq_file *seq, void *v)
4115 {
4116         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4117         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4118                    &ifp->addr,
4119                    ifp->idev->dev->ifindex,
4120                    ifp->prefix_len,
4121                    ifp->scope,
4122                    (u8) ifp->flags,
4123                    ifp->idev->dev->name);
4124         return 0;
4125 }
4126
4127 static const struct seq_operations if6_seq_ops = {
4128         .start  = if6_seq_start,
4129         .next   = if6_seq_next,
4130         .show   = if6_seq_show,
4131         .stop   = if6_seq_stop,
4132 };
4133
4134 static int if6_seq_open(struct inode *inode, struct file *file)
4135 {
4136         return seq_open_net(inode, file, &if6_seq_ops,
4137                             sizeof(struct if6_iter_state));
4138 }
4139
4140 static const struct file_operations if6_fops = {
4141         .owner          = THIS_MODULE,
4142         .open           = if6_seq_open,
4143         .read           = seq_read,
4144         .llseek         = seq_lseek,
4145         .release        = seq_release_net,
4146 };
4147
4148 static int __net_init if6_proc_net_init(struct net *net)
4149 {
4150         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4151                 return -ENOMEM;
4152         return 0;
4153 }
4154
4155 static void __net_exit if6_proc_net_exit(struct net *net)
4156 {
4157         remove_proc_entry("if_inet6", net->proc_net);
4158 }
4159
4160 static struct pernet_operations if6_proc_net_ops = {
4161         .init = if6_proc_net_init,
4162         .exit = if6_proc_net_exit,
4163 };
4164
4165 int __init if6_proc_init(void)
4166 {
4167         return register_pernet_subsys(&if6_proc_net_ops);
4168 }
4169
4170 void if6_proc_exit(void)
4171 {
4172         unregister_pernet_subsys(&if6_proc_net_ops);
4173 }
4174 #endif  /* CONFIG_PROC_FS */
4175
4176 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4177 /* Check if address is a home address configured on any interface. */
4178 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4179 {
4180         int ret = 0;
4181         struct inet6_ifaddr *ifp = NULL;
4182         unsigned int hash = inet6_addr_hash(addr);
4183
4184         rcu_read_lock_bh();
4185         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4186                 if (!net_eq(dev_net(ifp->idev->dev), net))
4187                         continue;
4188                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4189                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4190                         ret = 1;
4191                         break;
4192                 }
4193         }
4194         rcu_read_unlock_bh();
4195         return ret;
4196 }
4197 #endif
4198
4199 /*
4200  *      Periodic address status verification
4201  */
4202
4203 static void addrconf_verify_rtnl(void)
4204 {
4205         unsigned long now, next, next_sec, next_sched;
4206         struct inet6_ifaddr *ifp;
4207         int i;
4208
4209         ASSERT_RTNL();
4210
4211         rcu_read_lock_bh();
4212         now = jiffies;
4213         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4214
4215         cancel_delayed_work(&addr_chk_work);
4216
4217         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4218 restart:
4219                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4220                         unsigned long age;
4221
4222                         /* When setting preferred_lft to a value not zero or
4223                          * infinity, while valid_lft is infinity
4224                          * IFA_F_PERMANENT has a non-infinity life time.
4225                          */
4226                         if ((ifp->flags & IFA_F_PERMANENT) &&
4227                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4228                                 continue;
4229
4230                         spin_lock(&ifp->lock);
4231                         /* We try to batch several events at once. */
4232                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4233
4234                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4235                             age >= ifp->valid_lft) {
4236                                 spin_unlock(&ifp->lock);
4237                                 in6_ifa_hold(ifp);
4238                                 ipv6_del_addr(ifp);
4239                                 goto restart;
4240                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4241                                 spin_unlock(&ifp->lock);
4242                                 continue;
4243                         } else if (age >= ifp->prefered_lft) {
4244                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4245                                 int deprecate = 0;
4246
4247                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4248                                         deprecate = 1;
4249                                         ifp->flags |= IFA_F_DEPRECATED;
4250                                 }
4251
4252                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4253                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4254                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4255
4256                                 spin_unlock(&ifp->lock);
4257
4258                                 if (deprecate) {
4259                                         in6_ifa_hold(ifp);
4260
4261                                         ipv6_ifa_notify(0, ifp);
4262                                         in6_ifa_put(ifp);
4263                                         goto restart;
4264                                 }
4265                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4266                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4267                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4268                                         ifp->idev->cnf.dad_transmits *
4269                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4270
4271                                 if (age >= ifp->prefered_lft - regen_advance) {
4272                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4273                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4274                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4275                                         if (!ifp->regen_count && ifpub) {
4276                                                 ifp->regen_count++;
4277                                                 in6_ifa_hold(ifp);
4278                                                 in6_ifa_hold(ifpub);
4279                                                 spin_unlock(&ifp->lock);
4280
4281                                                 spin_lock(&ifpub->lock);
4282                                                 ifpub->regen_count = 0;
4283                                                 spin_unlock(&ifpub->lock);
4284                                                 ipv6_create_tempaddr(ifpub, ifp);
4285                                                 in6_ifa_put(ifpub);
4286                                                 in6_ifa_put(ifp);
4287                                                 goto restart;
4288                                         }
4289                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4290                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4291                                 spin_unlock(&ifp->lock);
4292                         } else {
4293                                 /* ifp->prefered_lft <= ifp->valid_lft */
4294                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4295                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4296                                 spin_unlock(&ifp->lock);
4297                         }
4298                 }
4299         }
4300
4301         next_sec = round_jiffies_up(next);
4302         next_sched = next;
4303
4304         /* If rounded timeout is accurate enough, accept it. */
4305         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4306                 next_sched = next_sec;
4307
4308         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4309         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4310                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4311
4312         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4313               now, next, next_sec, next_sched);
4314         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4315         rcu_read_unlock_bh();
4316 }
4317
4318 static void addrconf_verify_work(struct work_struct *w)
4319 {
4320         rtnl_lock();
4321         addrconf_verify_rtnl();
4322         rtnl_unlock();
4323 }
4324
4325 static void addrconf_verify(void)
4326 {
4327         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4328 }
4329
4330 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4331                                      struct in6_addr **peer_pfx)
4332 {
4333         struct in6_addr *pfx = NULL;
4334
4335         *peer_pfx = NULL;
4336
4337         if (addr)
4338                 pfx = nla_data(addr);
4339
4340         if (local) {
4341                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4342                         *peer_pfx = pfx;
4343                 pfx = nla_data(local);
4344         }
4345
4346         return pfx;
4347 }
4348
4349 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4350         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4351         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4352         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4353         [IFA_FLAGS]             = { .len = sizeof(u32) },
4354 };
4355
4356 static int
4357 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4358 {
4359         struct net *net = sock_net(skb->sk);
4360         struct ifaddrmsg *ifm;
4361         struct nlattr *tb[IFA_MAX+1];
4362         struct in6_addr *pfx, *peer_pfx;
4363         u32 ifa_flags;
4364         int err;
4365
4366         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4367         if (err < 0)
4368                 return err;
4369
4370         ifm = nlmsg_data(nlh);
4371         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4372         if (!pfx)
4373                 return -EINVAL;
4374
4375         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4376
4377         /* We ignore other flags so far. */
4378         ifa_flags &= IFA_F_MANAGETEMPADDR;
4379
4380         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4381                               ifm->ifa_prefixlen);
4382 }
4383
4384 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4385                              u32 prefered_lft, u32 valid_lft)
4386 {
4387         u32 flags;
4388         clock_t expires;
4389         unsigned long timeout;
4390         bool was_managetempaddr;
4391         bool had_prefixroute;
4392
4393         ASSERT_RTNL();
4394
4395         if (!valid_lft || (prefered_lft > valid_lft))
4396                 return -EINVAL;
4397
4398         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4399             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4400                 return -EINVAL;
4401
4402         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4403         if (addrconf_finite_timeout(timeout)) {
4404                 expires = jiffies_to_clock_t(timeout * HZ);
4405                 valid_lft = timeout;
4406                 flags = RTF_EXPIRES;
4407         } else {
4408                 expires = 0;
4409                 flags = 0;
4410                 ifa_flags |= IFA_F_PERMANENT;
4411         }
4412
4413         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4414         if (addrconf_finite_timeout(timeout)) {
4415                 if (timeout == 0)
4416                         ifa_flags |= IFA_F_DEPRECATED;
4417                 prefered_lft = timeout;
4418         }
4419
4420         spin_lock_bh(&ifp->lock);
4421         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4422         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4423                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4424         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4425                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4426                         IFA_F_NOPREFIXROUTE);
4427         ifp->flags |= ifa_flags;
4428         ifp->tstamp = jiffies;
4429         ifp->valid_lft = valid_lft;
4430         ifp->prefered_lft = prefered_lft;
4431
4432         spin_unlock_bh(&ifp->lock);
4433         if (!(ifp->flags&IFA_F_TENTATIVE))
4434                 ipv6_ifa_notify(0, ifp);
4435
4436         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4437                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4438                                       expires, flags);
4439         } else if (had_prefixroute) {
4440                 enum cleanup_prefix_rt_t action;
4441                 unsigned long rt_expires;
4442
4443                 write_lock_bh(&ifp->idev->lock);
4444                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4445                 write_unlock_bh(&ifp->idev->lock);
4446
4447                 if (action != CLEANUP_PREFIX_RT_NOP) {
4448                         cleanup_prefix_route(ifp, rt_expires,
4449                                 action == CLEANUP_PREFIX_RT_DEL);
4450                 }
4451         }
4452
4453         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4454                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4455                         valid_lft = prefered_lft = 0;
4456                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4457                                  !was_managetempaddr, jiffies);
4458         }
4459
4460         addrconf_verify_rtnl();
4461
4462         return 0;
4463 }
4464
4465 static int
4466 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4467 {
4468         struct net *net = sock_net(skb->sk);
4469         struct ifaddrmsg *ifm;
4470         struct nlattr *tb[IFA_MAX+1];
4471         struct in6_addr *pfx, *peer_pfx;
4472         struct inet6_ifaddr *ifa;
4473         struct net_device *dev;
4474         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4475         u32 ifa_flags;
4476         int err;
4477
4478         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4479         if (err < 0)
4480                 return err;
4481
4482         ifm = nlmsg_data(nlh);
4483         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4484         if (!pfx)
4485                 return -EINVAL;
4486
4487         if (tb[IFA_CACHEINFO]) {
4488                 struct ifa_cacheinfo *ci;
4489
4490                 ci = nla_data(tb[IFA_CACHEINFO]);
4491                 valid_lft = ci->ifa_valid;
4492                 preferred_lft = ci->ifa_prefered;
4493         } else {
4494                 preferred_lft = INFINITY_LIFE_TIME;
4495                 valid_lft = INFINITY_LIFE_TIME;
4496         }
4497
4498         dev =  __dev_get_by_index(net, ifm->ifa_index);
4499         if (!dev)
4500                 return -ENODEV;
4501
4502         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4503
4504         /* We ignore other flags so far. */
4505         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4506                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4507
4508         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4509         if (!ifa) {
4510                 /*
4511                  * It would be best to check for !NLM_F_CREATE here but
4512                  * userspace already relies on not having to provide this.
4513                  */
4514                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4515                                       ifm->ifa_prefixlen, ifa_flags,
4516                                       preferred_lft, valid_lft);
4517         }
4518
4519         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4520             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4521                 err = -EEXIST;
4522         else
4523                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4524
4525         in6_ifa_put(ifa);
4526
4527         return err;
4528 }
4529
4530 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4531                           u8 scope, int ifindex)
4532 {
4533         struct ifaddrmsg *ifm;
4534
4535         ifm = nlmsg_data(nlh);
4536         ifm->ifa_family = AF_INET6;
4537         ifm->ifa_prefixlen = prefixlen;
4538         ifm->ifa_flags = flags;
4539         ifm->ifa_scope = scope;
4540         ifm->ifa_index = ifindex;
4541 }
4542
4543 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4544                          unsigned long tstamp, u32 preferred, u32 valid)
4545 {
4546         struct ifa_cacheinfo ci;
4547
4548         ci.cstamp = cstamp_delta(cstamp);
4549         ci.tstamp = cstamp_delta(tstamp);
4550         ci.ifa_prefered = preferred;
4551         ci.ifa_valid = valid;
4552
4553         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4554 }
4555
4556 static inline int rt_scope(int ifa_scope)
4557 {
4558         if (ifa_scope & IFA_HOST)
4559                 return RT_SCOPE_HOST;
4560         else if (ifa_scope & IFA_LINK)
4561                 return RT_SCOPE_LINK;
4562         else if (ifa_scope & IFA_SITE)
4563                 return RT_SCOPE_SITE;
4564         else
4565                 return RT_SCOPE_UNIVERSE;
4566 }
4567
4568 static inline int inet6_ifaddr_msgsize(void)
4569 {
4570         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4571                + nla_total_size(16) /* IFA_LOCAL */
4572                + nla_total_size(16) /* IFA_ADDRESS */
4573                + nla_total_size(sizeof(struct ifa_cacheinfo))
4574                + nla_total_size(4)  /* IFA_FLAGS */;
4575 }
4576
4577 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4578                              u32 portid, u32 seq, int event, unsigned int flags)
4579 {
4580         struct nlmsghdr  *nlh;
4581         u32 preferred, valid;
4582
4583         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4584         if (!nlh)
4585                 return -EMSGSIZE;
4586
4587         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4588                       ifa->idev->dev->ifindex);
4589
4590         if (!((ifa->flags&IFA_F_PERMANENT) &&
4591               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4592                 preferred = ifa->prefered_lft;
4593                 valid = ifa->valid_lft;
4594                 if (preferred != INFINITY_LIFE_TIME) {
4595                         long tval = (jiffies - ifa->tstamp)/HZ;
4596                         if (preferred > tval)
4597                                 preferred -= tval;
4598                         else
4599                                 preferred = 0;
4600                         if (valid != INFINITY_LIFE_TIME) {
4601                                 if (valid > tval)
4602                                         valid -= tval;
4603                                 else
4604                                         valid = 0;
4605                         }
4606                 }
4607         } else {
4608                 preferred = INFINITY_LIFE_TIME;
4609                 valid = INFINITY_LIFE_TIME;
4610         }
4611
4612         if (!ipv6_addr_any(&ifa->peer_addr)) {
4613                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4614                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4615                         goto error;
4616         } else
4617                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4618                         goto error;
4619
4620         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4621                 goto error;
4622
4623         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4624                 goto error;
4625
4626         nlmsg_end(skb, nlh);
4627         return 0;
4628
4629 error:
4630         nlmsg_cancel(skb, nlh);
4631         return -EMSGSIZE;
4632 }
4633
4634 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4635                                 u32 portid, u32 seq, int event, u16 flags)
4636 {
4637         struct nlmsghdr  *nlh;
4638         u8 scope = RT_SCOPE_UNIVERSE;
4639         int ifindex = ifmca->idev->dev->ifindex;
4640
4641         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4642                 scope = RT_SCOPE_SITE;
4643
4644         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4645         if (!nlh)
4646                 return -EMSGSIZE;
4647
4648         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4649         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4650             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4651                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4652                 nlmsg_cancel(skb, nlh);
4653                 return -EMSGSIZE;
4654         }
4655
4656         nlmsg_end(skb, nlh);
4657         return 0;
4658 }
4659
4660 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4661                                 u32 portid, u32 seq, int event, unsigned int flags)
4662 {
4663         struct nlmsghdr  *nlh;
4664         u8 scope = RT_SCOPE_UNIVERSE;
4665         int ifindex = ifaca->aca_idev->dev->ifindex;
4666
4667         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4668                 scope = RT_SCOPE_SITE;
4669
4670         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4671         if (!nlh)
4672                 return -EMSGSIZE;
4673
4674         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4675         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4676             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4677                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4678                 nlmsg_cancel(skb, nlh);
4679                 return -EMSGSIZE;
4680         }
4681
4682         nlmsg_end(skb, nlh);
4683         return 0;
4684 }
4685
4686 enum addr_type_t {
4687         UNICAST_ADDR,
4688         MULTICAST_ADDR,
4689         ANYCAST_ADDR,
4690 };
4691
4692 /* called with rcu_read_lock() */
4693 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4694                           struct netlink_callback *cb, enum addr_type_t type,
4695                           int s_ip_idx, int *p_ip_idx)
4696 {
4697         struct ifmcaddr6 *ifmca;
4698         struct ifacaddr6 *ifaca;
4699         int err = 1;
4700         int ip_idx = *p_ip_idx;
4701
4702         read_lock_bh(&idev->lock);
4703         switch (type) {
4704         case UNICAST_ADDR: {
4705                 struct inet6_ifaddr *ifa;
4706
4707                 /* unicast address incl. temp addr */
4708                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4709                         if (++ip_idx < s_ip_idx)
4710                                 continue;
4711                         err = inet6_fill_ifaddr(skb, ifa,
4712                                                 NETLINK_CB(cb->skb).portid,
4713                                                 cb->nlh->nlmsg_seq,
4714                                                 RTM_NEWADDR,
4715                                                 NLM_F_MULTI);
4716                         if (err < 0)
4717                                 break;
4718                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4719                 }
4720                 break;
4721         }
4722         case MULTICAST_ADDR:
4723                 /* multicast address */
4724                 for (ifmca = idev->mc_list; ifmca;
4725                      ifmca = ifmca->next, ip_idx++) {
4726                         if (ip_idx < s_ip_idx)
4727                                 continue;
4728                         err = inet6_fill_ifmcaddr(skb, ifmca,
4729                                                   NETLINK_CB(cb->skb).portid,
4730                                                   cb->nlh->nlmsg_seq,
4731                                                   RTM_GETMULTICAST,
4732                                                   NLM_F_MULTI);
4733                         if (err < 0)
4734                                 break;
4735                 }
4736                 break;
4737         case ANYCAST_ADDR:
4738                 /* anycast address */
4739                 for (ifaca = idev->ac_list; ifaca;
4740                      ifaca = ifaca->aca_next, ip_idx++) {
4741                         if (ip_idx < s_ip_idx)
4742                                 continue;
4743                         err = inet6_fill_ifacaddr(skb, ifaca,
4744                                                   NETLINK_CB(cb->skb).portid,
4745                                                   cb->nlh->nlmsg_seq,
4746                                                   RTM_GETANYCAST,
4747                                                   NLM_F_MULTI);
4748                         if (err < 0)
4749                                 break;
4750                 }
4751                 break;
4752         default:
4753                 break;
4754         }
4755         read_unlock_bh(&idev->lock);
4756         *p_ip_idx = ip_idx;
4757         return err;
4758 }
4759
4760 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4761                            enum addr_type_t type)
4762 {
4763         struct net *net = sock_net(skb->sk);
4764         int h, s_h;
4765         int idx, ip_idx;
4766         int s_idx, s_ip_idx;
4767         struct net_device *dev;
4768         struct inet6_dev *idev;
4769         struct hlist_head *head;
4770
4771         s_h = cb->args[0];
4772         s_idx = idx = cb->args[1];
4773         s_ip_idx = ip_idx = cb->args[2];
4774
4775         rcu_read_lock();
4776         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4777         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4778                 idx = 0;
4779                 head = &net->dev_index_head[h];
4780                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4781                         if (idx < s_idx)
4782                                 goto cont;
4783                         if (h > s_h || idx > s_idx)
4784                                 s_ip_idx = 0;
4785                         ip_idx = 0;
4786                         idev = __in6_dev_get(dev);
4787                         if (!idev)
4788                                 goto cont;
4789
4790                         if (in6_dump_addrs(idev, skb, cb, type,
4791                                            s_ip_idx, &ip_idx) < 0)
4792                                 goto done;
4793 cont:
4794                         idx++;
4795                 }
4796         }
4797 done:
4798         rcu_read_unlock();
4799         cb->args[0] = h;
4800         cb->args[1] = idx;
4801         cb->args[2] = ip_idx;
4802
4803         return skb->len;
4804 }
4805
4806 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4807 {
4808         enum addr_type_t type = UNICAST_ADDR;
4809
4810         return inet6_dump_addr(skb, cb, type);
4811 }
4812
4813 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4814 {
4815         enum addr_type_t type = MULTICAST_ADDR;
4816
4817         return inet6_dump_addr(skb, cb, type);
4818 }
4819
4820
4821 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4822 {
4823         enum addr_type_t type = ANYCAST_ADDR;
4824
4825         return inet6_dump_addr(skb, cb, type);
4826 }
4827
4828 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4829 {
4830         struct net *net = sock_net(in_skb->sk);
4831         struct ifaddrmsg *ifm;
4832         struct nlattr *tb[IFA_MAX+1];
4833         struct in6_addr *addr = NULL, *peer;
4834         struct net_device *dev = NULL;
4835         struct inet6_ifaddr *ifa;
4836         struct sk_buff *skb;
4837         int err;
4838
4839         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4840         if (err < 0)
4841                 goto errout;
4842
4843         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4844         if (!addr) {
4845                 err = -EINVAL;
4846                 goto errout;
4847         }
4848
4849         ifm = nlmsg_data(nlh);
4850         if (ifm->ifa_index)
4851                 dev = __dev_get_by_index(net, ifm->ifa_index);
4852
4853         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4854         if (!ifa) {
4855                 err = -EADDRNOTAVAIL;
4856                 goto errout;
4857         }
4858
4859         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4860         if (!skb) {
4861                 err = -ENOBUFS;
4862                 goto errout_ifa;
4863         }
4864
4865         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4866                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4867         if (err < 0) {
4868                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4869                 WARN_ON(err == -EMSGSIZE);
4870                 kfree_skb(skb);
4871                 goto errout_ifa;
4872         }
4873         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4874 errout_ifa:
4875         in6_ifa_put(ifa);
4876 errout:
4877         return err;
4878 }
4879
4880 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4881 {
4882         struct sk_buff *skb;
4883         struct net *net = dev_net(ifa->idev->dev);
4884         int err = -ENOBUFS;
4885
4886         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4887         if (!skb)
4888                 goto errout;
4889
4890         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4891         if (err < 0) {
4892                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4893                 WARN_ON(err == -EMSGSIZE);
4894                 kfree_skb(skb);
4895                 goto errout;
4896         }
4897         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4898         return;
4899 errout:
4900         if (err < 0)
4901                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4902 }
4903
4904 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4905                                 __s32 *array, int bytes)
4906 {
4907         BUG_ON(bytes < (DEVCONF_MAX * 4));
4908
4909         memset(array, 0, bytes);
4910         array[DEVCONF_FORWARDING] = cnf->forwarding;
4911         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4912         array[DEVCONF_MTU6] = cnf->mtu6;
4913         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4914         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4915         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4916         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4917         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4918         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4919                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4920         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4921                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4922         array[DEVCONF_RTR_SOLICIT_DELAY] =
4923                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4924         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4925         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4926                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4927         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4928                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4929         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4930         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4931         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4932         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4933         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4934         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4935         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4936         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4937         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4938 #ifdef CONFIG_IPV6_ROUTER_PREF
4939         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4940         array[DEVCONF_RTR_PROBE_INTERVAL] =
4941                 jiffies_to_msecs(cnf->rtr_probe_interval);
4942 #ifdef CONFIG_IPV6_ROUTE_INFO
4943         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4944 #endif
4945 #endif
4946         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4947         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4948 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4949         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4950         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4951 #endif
4952 #ifdef CONFIG_IPV6_MROUTE
4953         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4954 #endif
4955         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4956         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4957         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4958         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4959         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4960         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4961         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4962         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4963         /* we omit DEVCONF_STABLE_SECRET for now */
4964         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4965         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4966         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4967         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4968 }
4969
4970 static inline size_t inet6_ifla6_size(void)
4971 {
4972         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4973              + nla_total_size(sizeof(struct ifla_cacheinfo))
4974              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4975              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4976              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4977              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4978 }
4979
4980 static inline size_t inet6_if_nlmsg_size(void)
4981 {
4982         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4983                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4984                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4985                + nla_total_size(4) /* IFLA_MTU */
4986                + nla_total_size(4) /* IFLA_LINK */
4987                + nla_total_size(1) /* IFLA_OPERSTATE */
4988                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4989 }
4990
4991 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4992                                         int bytes)
4993 {
4994         int i;
4995         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
4996         BUG_ON(pad < 0);
4997
4998         /* Use put_unaligned() because stats may not be aligned for u64. */
4999         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5000         for (i = 1; i < ICMP6_MIB_MAX; i++)
5001                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5002
5003         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5004 }
5005
5006 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5007                                         int bytes, size_t syncpoff)
5008 {
5009         int i, c;
5010         u64 buff[IPSTATS_MIB_MAX];
5011         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5012
5013         BUG_ON(pad < 0);
5014
5015         memset(buff, 0, sizeof(buff));
5016         buff[0] = IPSTATS_MIB_MAX;
5017
5018         for_each_possible_cpu(c) {
5019                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5020                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5021         }
5022
5023         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5024         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5025 }
5026
5027 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5028                              int bytes)
5029 {
5030         switch (attrtype) {
5031         case IFLA_INET6_STATS:
5032                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5033                                      offsetof(struct ipstats_mib, syncp));
5034                 break;
5035         case IFLA_INET6_ICMP6STATS:
5036                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5037                 break;
5038         }
5039 }
5040
5041 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5042                                   u32 ext_filter_mask)
5043 {
5044         struct nlattr *nla;
5045         struct ifla_cacheinfo ci;
5046
5047         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5048                 goto nla_put_failure;
5049         ci.max_reasm_len = IPV6_MAXPLEN;
5050         ci.tstamp = cstamp_delta(idev->tstamp);
5051         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5052         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5053         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5054                 goto nla_put_failure;
5055         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5056         if (!nla)
5057                 goto nla_put_failure;
5058         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5059
5060         /* XXX - MC not implemented */
5061
5062         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5063                 return 0;
5064
5065         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5066         if (!nla)
5067                 goto nla_put_failure;
5068         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5069
5070         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5071         if (!nla)
5072                 goto nla_put_failure;
5073         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5074
5075         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5076         if (!nla)
5077                 goto nla_put_failure;
5078
5079         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5080                 goto nla_put_failure;
5081
5082         read_lock_bh(&idev->lock);
5083         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5084         read_unlock_bh(&idev->lock);
5085
5086         return 0;
5087
5088 nla_put_failure:
5089         return -EMSGSIZE;
5090 }
5091
5092 static size_t inet6_get_link_af_size(const struct net_device *dev,
5093                                      u32 ext_filter_mask)
5094 {
5095         if (!__in6_dev_get(dev))
5096                 return 0;
5097
5098         return inet6_ifla6_size();
5099 }
5100
5101 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5102                               u32 ext_filter_mask)
5103 {
5104         struct inet6_dev *idev = __in6_dev_get(dev);
5105
5106         if (!idev)
5107                 return -ENODATA;
5108
5109         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5110                 return -EMSGSIZE;
5111
5112         return 0;
5113 }
5114
5115 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5116 {
5117         struct inet6_ifaddr *ifp;
5118         struct net_device *dev = idev->dev;
5119         bool clear_token, update_rs = false;
5120         struct in6_addr ll_addr;
5121
5122         ASSERT_RTNL();
5123
5124         if (!token)
5125                 return -EINVAL;
5126         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5127                 return -EINVAL;
5128         if (!ipv6_accept_ra(idev))
5129                 return -EINVAL;
5130         if (idev->cnf.rtr_solicits == 0)
5131                 return -EINVAL;
5132
5133         write_lock_bh(&idev->lock);
5134
5135         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5136         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5137
5138         write_unlock_bh(&idev->lock);
5139
5140         clear_token = ipv6_addr_any(token);
5141         if (clear_token)
5142                 goto update_lft;
5143
5144         if (!idev->dead && (idev->if_flags & IF_READY) &&
5145             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5146                              IFA_F_OPTIMISTIC)) {
5147                 /* If we're not ready, then normal ifup will take care
5148                  * of this. Otherwise, we need to request our rs here.
5149                  */
5150                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5151                 update_rs = true;
5152         }
5153
5154 update_lft:
5155         write_lock_bh(&idev->lock);
5156
5157         if (update_rs) {
5158                 idev->if_flags |= IF_RS_SENT;
5159                 idev->rs_interval = rfc3315_s14_backoff_init(
5160                         idev->cnf.rtr_solicit_interval);
5161                 idev->rs_probes = 1;
5162                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5163         }
5164
5165         /* Well, that's kinda nasty ... */
5166         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5167                 spin_lock(&ifp->lock);
5168                 if (ifp->tokenized) {
5169                         ifp->valid_lft = 0;
5170                         ifp->prefered_lft = 0;
5171                 }
5172                 spin_unlock(&ifp->lock);
5173         }
5174
5175         write_unlock_bh(&idev->lock);
5176         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5177         addrconf_verify_rtnl();
5178         return 0;
5179 }
5180
5181 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5182         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5183         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5184 };
5185
5186 static int inet6_validate_link_af(const struct net_device *dev,
5187                                   const struct nlattr *nla)
5188 {
5189         struct nlattr *tb[IFLA_INET6_MAX + 1];
5190
5191         if (dev && !__in6_dev_get(dev))
5192                 return -EAFNOSUPPORT;
5193
5194         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5195 }
5196
5197 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5198 {
5199         int err = -EINVAL;
5200         struct inet6_dev *idev = __in6_dev_get(dev);
5201         struct nlattr *tb[IFLA_INET6_MAX + 1];
5202
5203         if (!idev)
5204                 return -EAFNOSUPPORT;
5205
5206         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5207                 BUG();
5208
5209         if (tb[IFLA_INET6_TOKEN]) {
5210                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5211                 if (err)
5212                         return err;
5213         }
5214
5215         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5216                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5217
5218                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5219                     mode != IN6_ADDR_GEN_MODE_NONE &&
5220                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5221                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5222                         return -EINVAL;
5223
5224                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5225                     !idev->cnf.stable_secret.initialized &&
5226                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5227                         return -EINVAL;
5228
5229                 idev->addr_gen_mode = mode;
5230                 err = 0;
5231         }
5232
5233         return err;
5234 }
5235
5236 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5237                              u32 portid, u32 seq, int event, unsigned int flags)
5238 {
5239         struct net_device *dev = idev->dev;
5240         struct ifinfomsg *hdr;
5241         struct nlmsghdr *nlh;
5242         void *protoinfo;
5243
5244         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5245         if (!nlh)
5246                 return -EMSGSIZE;
5247
5248         hdr = nlmsg_data(nlh);
5249         hdr->ifi_family = AF_INET6;
5250         hdr->__ifi_pad = 0;
5251         hdr->ifi_type = dev->type;
5252         hdr->ifi_index = dev->ifindex;
5253         hdr->ifi_flags = dev_get_flags(dev);
5254         hdr->ifi_change = 0;
5255
5256         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5257             (dev->addr_len &&
5258              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5259             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5260             (dev->ifindex != dev_get_iflink(dev) &&
5261              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5262             nla_put_u8(skb, IFLA_OPERSTATE,
5263                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5264                 goto nla_put_failure;
5265         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5266         if (!protoinfo)
5267                 goto nla_put_failure;
5268
5269         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5270                 goto nla_put_failure;
5271
5272         nla_nest_end(skb, protoinfo);
5273         nlmsg_end(skb, nlh);
5274         return 0;
5275
5276 nla_put_failure:
5277         nlmsg_cancel(skb, nlh);
5278         return -EMSGSIZE;
5279 }
5280
5281 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5282 {
5283         struct net *net = sock_net(skb->sk);
5284         int h, s_h;
5285         int idx = 0, s_idx;
5286         struct net_device *dev;
5287         struct inet6_dev *idev;
5288         struct hlist_head *head;
5289
5290         s_h = cb->args[0];
5291         s_idx = cb->args[1];
5292
5293         rcu_read_lock();
5294         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5295                 idx = 0;
5296                 head = &net->dev_index_head[h];
5297                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5298                         if (idx < s_idx)
5299                                 goto cont;
5300                         idev = __in6_dev_get(dev);
5301                         if (!idev)
5302                                 goto cont;
5303                         if (inet6_fill_ifinfo(skb, idev,
5304                                               NETLINK_CB(cb->skb).portid,
5305                                               cb->nlh->nlmsg_seq,
5306                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5307                                 goto out;
5308 cont:
5309                         idx++;
5310                 }
5311         }
5312 out:
5313         rcu_read_unlock();
5314         cb->args[1] = idx;
5315         cb->args[0] = h;
5316
5317         return skb->len;
5318 }
5319
5320 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5321 {
5322         struct sk_buff *skb;
5323         struct net *net = dev_net(idev->dev);
5324         int err = -ENOBUFS;
5325
5326         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5327         if (!skb)
5328                 goto errout;
5329
5330         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5331         if (err < 0) {
5332                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5333                 WARN_ON(err == -EMSGSIZE);
5334                 kfree_skb(skb);
5335                 goto errout;
5336         }
5337         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5338         return;
5339 errout:
5340         if (err < 0)
5341                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5342 }
5343
5344 static inline size_t inet6_prefix_nlmsg_size(void)
5345 {
5346         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5347                + nla_total_size(sizeof(struct in6_addr))
5348                + nla_total_size(sizeof(struct prefix_cacheinfo));
5349 }
5350
5351 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5352                              struct prefix_info *pinfo, u32 portid, u32 seq,
5353                              int event, unsigned int flags)
5354 {
5355         struct prefixmsg *pmsg;
5356         struct nlmsghdr *nlh;
5357         struct prefix_cacheinfo ci;
5358
5359         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5360         if (!nlh)
5361                 return -EMSGSIZE;
5362
5363         pmsg = nlmsg_data(nlh);
5364         pmsg->prefix_family = AF_INET6;
5365         pmsg->prefix_pad1 = 0;
5366         pmsg->prefix_pad2 = 0;
5367         pmsg->prefix_ifindex = idev->dev->ifindex;
5368         pmsg->prefix_len = pinfo->prefix_len;
5369         pmsg->prefix_type = pinfo->type;
5370         pmsg->prefix_pad3 = 0;
5371         pmsg->prefix_flags = 0;
5372         if (pinfo->onlink)
5373                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5374         if (pinfo->autoconf)
5375                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5376
5377         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5378                 goto nla_put_failure;
5379         ci.preferred_time = ntohl(pinfo->prefered);
5380         ci.valid_time = ntohl(pinfo->valid);
5381         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5382                 goto nla_put_failure;
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 void inet6_prefix_notify(int event, struct inet6_dev *idev,
5392                          struct prefix_info *pinfo)
5393 {
5394         struct sk_buff *skb;
5395         struct net *net = dev_net(idev->dev);
5396         int err = -ENOBUFS;
5397
5398         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5399         if (!skb)
5400                 goto errout;
5401
5402         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5403         if (err < 0) {
5404                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5405                 WARN_ON(err == -EMSGSIZE);
5406                 kfree_skb(skb);
5407                 goto errout;
5408         }
5409         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5410         return;
5411 errout:
5412         if (err < 0)
5413                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5414 }
5415
5416 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5417 {
5418         struct net *net = dev_net(ifp->idev->dev);
5419
5420         if (event)
5421                 ASSERT_RTNL();
5422
5423         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5424
5425         switch (event) {
5426         case RTM_NEWADDR:
5427                 /*
5428                  * If the address was optimistic
5429                  * we inserted the route at the start of
5430                  * our DAD process, so we don't need
5431                  * to do it again
5432                  */
5433                 if (!(ifp->rt->rt6i_node))
5434                         ip6_ins_rt(ifp->rt);
5435                 if (ifp->idev->cnf.forwarding)
5436                         addrconf_join_anycast(ifp);
5437                 if (!ipv6_addr_any(&ifp->peer_addr))
5438                         addrconf_prefix_route(&ifp->peer_addr, 128,
5439                                               ifp->idev->dev, 0, 0);
5440                 break;
5441         case RTM_DELADDR:
5442                 if (ifp->idev->cnf.forwarding)
5443                         addrconf_leave_anycast(ifp);
5444                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5445                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5446                         struct rt6_info *rt;
5447
5448                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5449                                                        ifp->idev->dev, 0, 0);
5450                         if (rt)
5451                                 ip6_del_rt(rt);
5452                 }
5453                 if (ifp->rt) {
5454                         dst_hold(&ifp->rt->dst);
5455                         ip6_del_rt(ifp->rt);
5456                 }
5457                 rt_genid_bump_ipv6(net);
5458                 break;
5459         }
5460         atomic_inc(&net->ipv6.dev_addr_genid);
5461 }
5462
5463 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5464 {
5465         rcu_read_lock_bh();
5466         if (likely(ifp->idev->dead == 0))
5467                 __ipv6_ifa_notify(event, ifp);
5468         rcu_read_unlock_bh();
5469 }
5470
5471 #ifdef CONFIG_SYSCTL
5472
5473 static
5474 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5475                            void __user *buffer, size_t *lenp, loff_t *ppos)
5476 {
5477         int *valp = ctl->data;
5478         int val = *valp;
5479         loff_t pos = *ppos;
5480         struct ctl_table lctl;
5481         int ret;
5482
5483         /*
5484          * ctl->data points to idev->cnf.forwarding, we should
5485          * not modify it until we get the rtnl lock.
5486          */
5487         lctl = *ctl;
5488         lctl.data = &val;
5489
5490         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5491
5492         if (write)
5493                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5494         if (ret)
5495                 *ppos = pos;
5496         return ret;
5497 }
5498
5499 static
5500 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5501                         void __user *buffer, size_t *lenp, loff_t *ppos)
5502 {
5503         struct inet6_dev *idev = ctl->extra1;
5504         int min_mtu = IPV6_MIN_MTU;
5505         struct ctl_table lctl;
5506
5507         lctl = *ctl;
5508         lctl.extra1 = &min_mtu;
5509         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5510
5511         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5512 }
5513
5514 static void dev_disable_change(struct inet6_dev *idev)
5515 {
5516         struct netdev_notifier_info info;
5517
5518         if (!idev || !idev->dev)
5519                 return;
5520
5521         netdev_notifier_info_init(&info, idev->dev);
5522         if (idev->cnf.disable_ipv6)
5523                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5524         else
5525                 addrconf_notify(NULL, NETDEV_UP, &info);
5526 }
5527
5528 static void addrconf_disable_change(struct net *net, __s32 newf)
5529 {
5530         struct net_device *dev;
5531         struct inet6_dev *idev;
5532
5533         rcu_read_lock();
5534         for_each_netdev_rcu(net, dev) {
5535                 idev = __in6_dev_get(dev);
5536                 if (idev) {
5537                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5538                         idev->cnf.disable_ipv6 = newf;
5539                         if (changed)
5540                                 dev_disable_change(idev);
5541                 }
5542         }
5543         rcu_read_unlock();
5544 }
5545
5546 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5547 {
5548         struct net *net;
5549         int old;
5550
5551         if (!rtnl_trylock())
5552                 return restart_syscall();
5553
5554         net = (struct net *)table->extra2;
5555         old = *p;
5556         *p = newf;
5557
5558         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5559                 rtnl_unlock();
5560                 return 0;
5561         }
5562
5563         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5564                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5565                 addrconf_disable_change(net, newf);
5566         } else if ((!newf) ^ (!old))
5567                 dev_disable_change((struct inet6_dev *)table->extra1);
5568
5569         rtnl_unlock();
5570         return 0;
5571 }
5572
5573 static
5574 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5575                             void __user *buffer, size_t *lenp, loff_t *ppos)
5576 {
5577         int *valp = ctl->data;
5578         int val = *valp;
5579         loff_t pos = *ppos;
5580         struct ctl_table lctl;
5581         int ret;
5582
5583         /*
5584          * ctl->data points to idev->cnf.disable_ipv6, we should
5585          * not modify it until we get the rtnl lock.
5586          */
5587         lctl = *ctl;
5588         lctl.data = &val;
5589
5590         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5591
5592         if (write)
5593                 ret = addrconf_disable_ipv6(ctl, valp, val);
5594         if (ret)
5595                 *ppos = pos;
5596         return ret;
5597 }
5598
5599 static
5600 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5601                               void __user *buffer, size_t *lenp, loff_t *ppos)
5602 {
5603         int *valp = ctl->data;
5604         int ret;
5605         int old, new;
5606
5607         old = *valp;
5608         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5609         new = *valp;
5610
5611         if (write && old != new) {
5612                 struct net *net = ctl->extra2;
5613
5614                 if (!rtnl_trylock())
5615                         return restart_syscall();
5616
5617                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5618                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5619                                                      NETCONFA_IFINDEX_DEFAULT,
5620                                                      net->ipv6.devconf_dflt);
5621                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5622                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5623                                                      NETCONFA_IFINDEX_ALL,
5624                                                      net->ipv6.devconf_all);
5625                 else {
5626                         struct inet6_dev *idev = ctl->extra1;
5627
5628                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5629                                                      idev->dev->ifindex,
5630                                                      &idev->cnf);
5631                 }
5632                 rtnl_unlock();
5633         }
5634
5635         return ret;
5636 }
5637
5638 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5639                                          void __user *buffer, size_t *lenp,
5640                                          loff_t *ppos)
5641 {
5642         int err;
5643         struct in6_addr addr;
5644         char str[IPV6_MAX_STRLEN];
5645         struct ctl_table lctl = *ctl;
5646         struct net *net = ctl->extra2;
5647         struct ipv6_stable_secret *secret = ctl->data;
5648
5649         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5650                 return -EIO;
5651
5652         lctl.maxlen = IPV6_MAX_STRLEN;
5653         lctl.data = str;
5654
5655         if (!rtnl_trylock())
5656                 return restart_syscall();
5657
5658         if (!write && !secret->initialized) {
5659                 err = -EIO;
5660                 goto out;
5661         }
5662
5663         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5664         if (err >= sizeof(str)) {
5665                 err = -EIO;
5666                 goto out;
5667         }
5668
5669         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5670         if (err || !write)
5671                 goto out;
5672
5673         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5674                 err = -EIO;
5675                 goto out;
5676         }
5677
5678         secret->initialized = true;
5679         secret->secret = addr;
5680
5681         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5682                 struct net_device *dev;
5683
5684                 for_each_netdev(net, dev) {
5685                         struct inet6_dev *idev = __in6_dev_get(dev);
5686
5687                         if (idev) {
5688                                 idev->addr_gen_mode =
5689                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5690                         }
5691                 }
5692         } else {
5693                 struct inet6_dev *idev = ctl->extra1;
5694
5695                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5696         }
5697
5698 out:
5699         rtnl_unlock();
5700
5701         return err;
5702 }
5703
5704 static
5705 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5706                                                 int write,
5707                                                 void __user *buffer,
5708                                                 size_t *lenp,
5709                                                 loff_t *ppos)
5710 {
5711         int *valp = ctl->data;
5712         int val = *valp;
5713         loff_t pos = *ppos;
5714         struct ctl_table lctl;
5715         int ret;
5716
5717         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5718          * we should not modify it until we get the rtnl lock.
5719          */
5720         lctl = *ctl;
5721         lctl.data = &val;
5722
5723         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5724
5725         if (write)
5726                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5727         if (ret)
5728                 *ppos = pos;
5729         return ret;
5730 }
5731
5732 static int minus_one = -1;
5733 static const int one = 1;
5734 static const int two_five_five = 255;
5735
5736 static const struct ctl_table addrconf_sysctl[] = {
5737         {
5738                 .procname       = "forwarding",
5739                 .data           = &ipv6_devconf.forwarding,
5740                 .maxlen         = sizeof(int),
5741                 .mode           = 0644,
5742                 .proc_handler   = addrconf_sysctl_forward,
5743         },
5744         {
5745                 .procname       = "hop_limit",
5746                 .data           = &ipv6_devconf.hop_limit,
5747                 .maxlen         = sizeof(int),
5748                 .mode           = 0644,
5749                 .proc_handler   = proc_dointvec_minmax,
5750                 .extra1         = (void *)&one,
5751                 .extra2         = (void *)&two_five_five,
5752         },
5753         {
5754                 .procname       = "mtu",
5755                 .data           = &ipv6_devconf.mtu6,
5756                 .maxlen         = sizeof(int),
5757                 .mode           = 0644,
5758                 .proc_handler   = addrconf_sysctl_mtu,
5759         },
5760         {
5761                 .procname       = "accept_ra",
5762                 .data           = &ipv6_devconf.accept_ra,
5763                 .maxlen         = sizeof(int),
5764                 .mode           = 0644,
5765                 .proc_handler   = proc_dointvec,
5766         },
5767         {
5768                 .procname       = "accept_redirects",
5769                 .data           = &ipv6_devconf.accept_redirects,
5770                 .maxlen         = sizeof(int),
5771                 .mode           = 0644,
5772                 .proc_handler   = proc_dointvec,
5773         },
5774         {
5775                 .procname       = "autoconf",
5776                 .data           = &ipv6_devconf.autoconf,
5777                 .maxlen         = sizeof(int),
5778                 .mode           = 0644,
5779                 .proc_handler   = proc_dointvec,
5780         },
5781         {
5782                 .procname       = "dad_transmits",
5783                 .data           = &ipv6_devconf.dad_transmits,
5784                 .maxlen         = sizeof(int),
5785                 .mode           = 0644,
5786                 .proc_handler   = proc_dointvec,
5787         },
5788         {
5789                 .procname       = "router_solicitations",
5790                 .data           = &ipv6_devconf.rtr_solicits,
5791                 .maxlen         = sizeof(int),
5792                 .mode           = 0644,
5793                 .proc_handler   = proc_dointvec_minmax,
5794                 .extra1         = &minus_one,
5795         },
5796         {
5797                 .procname       = "router_solicitation_interval",
5798                 .data           = &ipv6_devconf.rtr_solicit_interval,
5799                 .maxlen         = sizeof(int),
5800                 .mode           = 0644,
5801                 .proc_handler   = proc_dointvec_jiffies,
5802         },
5803         {
5804                 .procname       = "router_solicitation_max_interval",
5805                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
5806                 .maxlen         = sizeof(int),
5807                 .mode           = 0644,
5808                 .proc_handler   = proc_dointvec_jiffies,
5809         },
5810         {
5811                 .procname       = "router_solicitation_delay",
5812                 .data           = &ipv6_devconf.rtr_solicit_delay,
5813                 .maxlen         = sizeof(int),
5814                 .mode           = 0644,
5815                 .proc_handler   = proc_dointvec_jiffies,
5816         },
5817         {
5818                 .procname       = "force_mld_version",
5819                 .data           = &ipv6_devconf.force_mld_version,
5820                 .maxlen         = sizeof(int),
5821                 .mode           = 0644,
5822                 .proc_handler   = proc_dointvec,
5823         },
5824         {
5825                 .procname       = "mldv1_unsolicited_report_interval",
5826                 .data           =
5827                         &ipv6_devconf.mldv1_unsolicited_report_interval,
5828                 .maxlen         = sizeof(int),
5829                 .mode           = 0644,
5830                 .proc_handler   = proc_dointvec_ms_jiffies,
5831         },
5832         {
5833                 .procname       = "mldv2_unsolicited_report_interval",
5834                 .data           =
5835                         &ipv6_devconf.mldv2_unsolicited_report_interval,
5836                 .maxlen         = sizeof(int),
5837                 .mode           = 0644,
5838                 .proc_handler   = proc_dointvec_ms_jiffies,
5839         },
5840         {
5841                 .procname       = "use_tempaddr",
5842                 .data           = &ipv6_devconf.use_tempaddr,
5843                 .maxlen         = sizeof(int),
5844                 .mode           = 0644,
5845                 .proc_handler   = proc_dointvec,
5846         },
5847         {
5848                 .procname       = "temp_valid_lft",
5849                 .data           = &ipv6_devconf.temp_valid_lft,
5850                 .maxlen         = sizeof(int),
5851                 .mode           = 0644,
5852                 .proc_handler   = proc_dointvec,
5853         },
5854         {
5855                 .procname       = "temp_prefered_lft",
5856                 .data           = &ipv6_devconf.temp_prefered_lft,
5857                 .maxlen         = sizeof(int),
5858                 .mode           = 0644,
5859                 .proc_handler   = proc_dointvec,
5860         },
5861         {
5862                 .procname       = "regen_max_retry",
5863                 .data           = &ipv6_devconf.regen_max_retry,
5864                 .maxlen         = sizeof(int),
5865                 .mode           = 0644,
5866                 .proc_handler   = proc_dointvec,
5867         },
5868         {
5869                 .procname       = "max_desync_factor",
5870                 .data           = &ipv6_devconf.max_desync_factor,
5871                 .maxlen         = sizeof(int),
5872                 .mode           = 0644,
5873                 .proc_handler   = proc_dointvec,
5874         },
5875         {
5876                 .procname       = "max_addresses",
5877                 .data           = &ipv6_devconf.max_addresses,
5878                 .maxlen         = sizeof(int),
5879                 .mode           = 0644,
5880                 .proc_handler   = proc_dointvec,
5881         },
5882         {
5883                 .procname       = "accept_ra_defrtr",
5884                 .data           = &ipv6_devconf.accept_ra_defrtr,
5885                 .maxlen         = sizeof(int),
5886                 .mode           = 0644,
5887                 .proc_handler   = proc_dointvec,
5888         },
5889         {
5890                 .procname       = "accept_ra_min_hop_limit",
5891                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5892                 .maxlen         = sizeof(int),
5893                 .mode           = 0644,
5894                 .proc_handler   = proc_dointvec,
5895         },
5896         {
5897                 .procname       = "accept_ra_pinfo",
5898                 .data           = &ipv6_devconf.accept_ra_pinfo,
5899                 .maxlen         = sizeof(int),
5900                 .mode           = 0644,
5901                 .proc_handler   = proc_dointvec,
5902         },
5903 #ifdef CONFIG_IPV6_ROUTER_PREF
5904         {
5905                 .procname       = "accept_ra_rtr_pref",
5906                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
5907                 .maxlen         = sizeof(int),
5908                 .mode           = 0644,
5909                 .proc_handler   = proc_dointvec,
5910         },
5911         {
5912                 .procname       = "router_probe_interval",
5913                 .data           = &ipv6_devconf.rtr_probe_interval,
5914                 .maxlen         = sizeof(int),
5915                 .mode           = 0644,
5916                 .proc_handler   = proc_dointvec_jiffies,
5917         },
5918 #ifdef CONFIG_IPV6_ROUTE_INFO
5919         {
5920                 .procname       = "accept_ra_rt_info_max_plen",
5921                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5922                 .maxlen         = sizeof(int),
5923                 .mode           = 0644,
5924                 .proc_handler   = proc_dointvec,
5925         },
5926 #endif
5927 #endif
5928         {
5929                 .procname       = "proxy_ndp",
5930                 .data           = &ipv6_devconf.proxy_ndp,
5931                 .maxlen         = sizeof(int),
5932                 .mode           = 0644,
5933                 .proc_handler   = addrconf_sysctl_proxy_ndp,
5934         },
5935         {
5936                 .procname       = "accept_source_route",
5937                 .data           = &ipv6_devconf.accept_source_route,
5938                 .maxlen         = sizeof(int),
5939                 .mode           = 0644,
5940                 .proc_handler   = proc_dointvec,
5941         },
5942 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5943         {
5944                 .procname       = "optimistic_dad",
5945                 .data           = &ipv6_devconf.optimistic_dad,
5946                 .maxlen         = sizeof(int),
5947                 .mode           = 0644,
5948                 .proc_handler   = proc_dointvec,
5949         },
5950         {
5951                 .procname       = "use_optimistic",
5952                 .data           = &ipv6_devconf.use_optimistic,
5953                 .maxlen         = sizeof(int),
5954                 .mode           = 0644,
5955                 .proc_handler   = proc_dointvec,
5956         },
5957 #endif
5958 #ifdef CONFIG_IPV6_MROUTE
5959         {
5960                 .procname       = "mc_forwarding",
5961                 .data           = &ipv6_devconf.mc_forwarding,
5962                 .maxlen         = sizeof(int),
5963                 .mode           = 0444,
5964                 .proc_handler   = proc_dointvec,
5965         },
5966 #endif
5967         {
5968                 .procname       = "disable_ipv6",
5969                 .data           = &ipv6_devconf.disable_ipv6,
5970                 .maxlen         = sizeof(int),
5971                 .mode           = 0644,
5972                 .proc_handler   = addrconf_sysctl_disable,
5973         },
5974         {
5975                 .procname       = "accept_dad",
5976                 .data           = &ipv6_devconf.accept_dad,
5977                 .maxlen         = sizeof(int),
5978                 .mode           = 0644,
5979                 .proc_handler   = proc_dointvec,
5980         },
5981         {
5982                 .procname       = "force_tllao",
5983                 .data           = &ipv6_devconf.force_tllao,
5984                 .maxlen         = sizeof(int),
5985                 .mode           = 0644,
5986                 .proc_handler   = proc_dointvec
5987         },
5988         {
5989                 .procname       = "ndisc_notify",
5990                 .data           = &ipv6_devconf.ndisc_notify,
5991                 .maxlen         = sizeof(int),
5992                 .mode           = 0644,
5993                 .proc_handler   = proc_dointvec
5994         },
5995         {
5996                 .procname       = "suppress_frag_ndisc",
5997                 .data           = &ipv6_devconf.suppress_frag_ndisc,
5998                 .maxlen         = sizeof(int),
5999                 .mode           = 0644,
6000                 .proc_handler   = proc_dointvec
6001         },
6002         {
6003                 .procname       = "accept_ra_from_local",
6004                 .data           = &ipv6_devconf.accept_ra_from_local,
6005                 .maxlen         = sizeof(int),
6006                 .mode           = 0644,
6007                 .proc_handler   = proc_dointvec,
6008         },
6009         {
6010                 .procname       = "accept_ra_mtu",
6011                 .data           = &ipv6_devconf.accept_ra_mtu,
6012                 .maxlen         = sizeof(int),
6013                 .mode           = 0644,
6014                 .proc_handler   = proc_dointvec,
6015         },
6016         {
6017                 .procname       = "stable_secret",
6018                 .data           = &ipv6_devconf.stable_secret,
6019                 .maxlen         = IPV6_MAX_STRLEN,
6020                 .mode           = 0600,
6021                 .proc_handler   = addrconf_sysctl_stable_secret,
6022         },
6023         {
6024                 .procname       = "use_oif_addrs_only",
6025                 .data           = &ipv6_devconf.use_oif_addrs_only,
6026                 .maxlen         = sizeof(int),
6027                 .mode           = 0644,
6028                 .proc_handler   = proc_dointvec,
6029         },
6030         {
6031                 .procname       = "ignore_routes_with_linkdown",
6032                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6033                 .maxlen         = sizeof(int),
6034                 .mode           = 0644,
6035                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6036         },
6037         {
6038                 .procname       = "drop_unicast_in_l2_multicast",
6039                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6040                 .maxlen         = sizeof(int),
6041                 .mode           = 0644,
6042                 .proc_handler   = proc_dointvec,
6043         },
6044         {
6045                 .procname       = "drop_unsolicited_na",
6046                 .data           = &ipv6_devconf.drop_unsolicited_na,
6047                 .maxlen         = sizeof(int),
6048                 .mode           = 0644,
6049                 .proc_handler   = proc_dointvec,
6050         },
6051         {
6052                 .procname       = "keep_addr_on_down",
6053                 .data           = &ipv6_devconf.keep_addr_on_down,
6054                 .maxlen         = sizeof(int),
6055                 .mode           = 0644,
6056                 .proc_handler   = proc_dointvec,
6057
6058         },
6059         {
6060                 /* sentinel */
6061         }
6062 };
6063
6064 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6065                 struct inet6_dev *idev, struct ipv6_devconf *p)
6066 {
6067         int i, ifindex;
6068         struct ctl_table *table;
6069         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6070
6071         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6072         if (!table)
6073                 goto out;
6074
6075         for (i = 0; table[i].data; i++) {
6076                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6077                 /* If one of these is already set, then it is not safe to
6078                  * overwrite either of them: this makes proc_dointvec_minmax
6079                  * usable.
6080                  */
6081                 if (!table[i].extra1 && !table[i].extra2) {
6082                         table[i].extra1 = idev; /* embedded; no ref */
6083                         table[i].extra2 = net;
6084                 }
6085         }
6086
6087         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6088
6089         p->sysctl_header = register_net_sysctl(net, path, table);
6090         if (!p->sysctl_header)
6091                 goto free;
6092
6093         if (!strcmp(dev_name, "all"))
6094                 ifindex = NETCONFA_IFINDEX_ALL;
6095         else if (!strcmp(dev_name, "default"))
6096                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6097         else
6098                 ifindex = idev->dev->ifindex;
6099         inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6100         return 0;
6101
6102 free:
6103         kfree(table);
6104 out:
6105         return -ENOBUFS;
6106 }
6107
6108 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6109 {
6110         struct ctl_table *table;
6111
6112         if (!p->sysctl_header)
6113                 return;
6114
6115         table = p->sysctl_header->ctl_table_arg;
6116         unregister_net_sysctl_table(p->sysctl_header);
6117         p->sysctl_header = NULL;
6118         kfree(table);
6119 }
6120
6121 static int addrconf_sysctl_register(struct inet6_dev *idev)
6122 {
6123         int err;
6124
6125         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6126                 return -EINVAL;
6127
6128         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6129                                     &ndisc_ifinfo_sysctl_change);
6130         if (err)
6131                 return err;
6132         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6133                                          idev, &idev->cnf);
6134         if (err)
6135                 neigh_sysctl_unregister(idev->nd_parms);
6136
6137         return err;
6138 }
6139
6140 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6141 {
6142         __addrconf_sysctl_unregister(&idev->cnf);
6143         neigh_sysctl_unregister(idev->nd_parms);
6144 }
6145
6146
6147 #endif
6148
6149 static int __net_init addrconf_init_net(struct net *net)
6150 {
6151         int err = -ENOMEM;
6152         struct ipv6_devconf *all, *dflt;
6153
6154         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6155         if (!all)
6156                 goto err_alloc_all;
6157
6158         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6159         if (!dflt)
6160                 goto err_alloc_dflt;
6161
6162         /* these will be inherited by all namespaces */
6163         dflt->autoconf = ipv6_defaults.autoconf;
6164         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6165
6166         dflt->stable_secret.initialized = false;
6167         all->stable_secret.initialized = false;
6168
6169         net->ipv6.devconf_all = all;
6170         net->ipv6.devconf_dflt = dflt;
6171
6172 #ifdef CONFIG_SYSCTL
6173         err = __addrconf_sysctl_register(net, "all", NULL, all);
6174         if (err < 0)
6175                 goto err_reg_all;
6176
6177         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6178         if (err < 0)
6179                 goto err_reg_dflt;
6180 #endif
6181         return 0;
6182
6183 #ifdef CONFIG_SYSCTL
6184 err_reg_dflt:
6185         __addrconf_sysctl_unregister(all);
6186 err_reg_all:
6187         kfree(dflt);
6188 #endif
6189 err_alloc_dflt:
6190         kfree(all);
6191 err_alloc_all:
6192         return err;
6193 }
6194
6195 static void __net_exit addrconf_exit_net(struct net *net)
6196 {
6197 #ifdef CONFIG_SYSCTL
6198         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6199         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6200 #endif
6201         kfree(net->ipv6.devconf_dflt);
6202         kfree(net->ipv6.devconf_all);
6203 }
6204
6205 static struct pernet_operations addrconf_ops = {
6206         .init = addrconf_init_net,
6207         .exit = addrconf_exit_net,
6208 };
6209
6210 static struct rtnl_af_ops inet6_ops __read_mostly = {
6211         .family           = AF_INET6,
6212         .fill_link_af     = inet6_fill_link_af,
6213         .get_link_af_size = inet6_get_link_af_size,
6214         .validate_link_af = inet6_validate_link_af,
6215         .set_link_af      = inet6_set_link_af,
6216 };
6217
6218 /*
6219  *      Init / cleanup code
6220  */
6221
6222 int __init addrconf_init(void)
6223 {
6224         struct inet6_dev *idev;
6225         int i, err;
6226
6227         err = ipv6_addr_label_init();
6228         if (err < 0) {
6229                 pr_crit("%s: cannot initialize default policy table: %d\n",
6230                         __func__, err);
6231                 goto out;
6232         }
6233
6234         err = register_pernet_subsys(&addrconf_ops);
6235         if (err < 0)
6236                 goto out_addrlabel;
6237
6238         addrconf_wq = create_workqueue("ipv6_addrconf");
6239         if (!addrconf_wq) {
6240                 err = -ENOMEM;
6241                 goto out_nowq;
6242         }
6243
6244         /* The addrconf netdev notifier requires that loopback_dev
6245          * has it's ipv6 private information allocated and setup
6246          * before it can bring up and give link-local addresses
6247          * to other devices which are up.
6248          *
6249          * Unfortunately, loopback_dev is not necessarily the first
6250          * entry in the global dev_base list of net devices.  In fact,
6251          * it is likely to be the very last entry on that list.
6252          * So this causes the notifier registry below to try and
6253          * give link-local addresses to all devices besides loopback_dev
6254          * first, then loopback_dev, which cases all the non-loopback_dev
6255          * devices to fail to get a link-local address.
6256          *
6257          * So, as a temporary fix, allocate the ipv6 structure for
6258          * loopback_dev first by hand.
6259          * Longer term, all of the dependencies ipv6 has upon the loopback
6260          * device and it being up should be removed.
6261          */
6262         rtnl_lock();
6263         idev = ipv6_add_dev(init_net.loopback_dev);
6264         rtnl_unlock();
6265         if (IS_ERR(idev)) {
6266                 err = PTR_ERR(idev);
6267                 goto errlo;
6268         }
6269
6270         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6271                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6272
6273         register_netdevice_notifier(&ipv6_dev_notf);
6274
6275         addrconf_verify();
6276
6277         rtnl_af_register(&inet6_ops);
6278
6279         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6280                               NULL);
6281         if (err < 0)
6282                 goto errout;
6283
6284         /* Only the first call to __rtnl_register can fail */
6285         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6286         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6287         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6288                         inet6_dump_ifaddr, NULL);
6289         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6290                         inet6_dump_ifmcaddr, NULL);
6291         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6292                         inet6_dump_ifacaddr, NULL);
6293         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6294                         inet6_netconf_dump_devconf, NULL);
6295
6296         ipv6_addr_label_rtnl_register();
6297
6298         return 0;
6299 errout:
6300         rtnl_af_unregister(&inet6_ops);
6301         unregister_netdevice_notifier(&ipv6_dev_notf);
6302 errlo:
6303         destroy_workqueue(addrconf_wq);
6304 out_nowq:
6305         unregister_pernet_subsys(&addrconf_ops);
6306 out_addrlabel:
6307         ipv6_addr_label_cleanup();
6308 out:
6309         return err;
6310 }
6311
6312 void addrconf_cleanup(void)
6313 {
6314         struct net_device *dev;
6315         int i;
6316
6317         unregister_netdevice_notifier(&ipv6_dev_notf);
6318         unregister_pernet_subsys(&addrconf_ops);
6319         ipv6_addr_label_cleanup();
6320
6321         rtnl_lock();
6322
6323         __rtnl_af_unregister(&inet6_ops);
6324
6325         /* clean dev list */
6326         for_each_netdev(&init_net, dev) {
6327                 if (__in6_dev_get(dev) == NULL)
6328                         continue;
6329                 addrconf_ifdown(dev, 1);
6330         }
6331         addrconf_ifdown(init_net.loopback_dev, 2);
6332
6333         /*
6334          *      Check hash table.
6335          */
6336         spin_lock_bh(&addrconf_hash_lock);
6337         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6338                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6339         spin_unlock_bh(&addrconf_hash_lock);
6340         cancel_delayed_work(&addr_chk_work);
6341         rtnl_unlock();
6342
6343         destroy_workqueue(addrconf_wq);
6344 }