net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #define pr_fmt(fmt) "IPv6: " fmt
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/kernel.h>
  46 #include <linux/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/af_ieee802154.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 #ifdef CONFIG_SYSCTL
 116 static int addrconf_sysctl_register(struct inet6_dev *idev);
 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 118 #else
 119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 120 {
 121         return 0;
 122 }
 123
 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 125 {
 126 }
 127 #endif
 128
 129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 131 static void ipv6_regen_rndid(unsigned long data);
 132
 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 134 static int ipv6_count_addresses(struct inet6_dev *idev);
 135 static int ipv6_generate_stable_address(struct in6_addr *addr,
 136                                         u8 dad_count,
 137                                         const struct inet6_dev *idev);
 138
 139 /*
 140  *      Configured unicast address hash table
 141  */
 142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 143 static DEFINE_SPINLOCK(addrconf_hash_lock);
 144
 145 static void addrconf_verify(void);
 146 static void addrconf_verify_rtnl(void);
 147 static void addrconf_verify_work(struct work_struct *);
 148
 149 static struct workqueue_struct *addrconf_wq;
 150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 151
 152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 154
 155 static void addrconf_type_change(struct net_device *dev,
 156                                  unsigned long event);
 157 static int addrconf_ifdown(struct net_device *dev, int how);
 158
 159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 160                                                   int plen,
 161                                                   const struct net_device *dev,
 162                                                   u32 flags, u32 noflags);
 163
 164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 165 static void addrconf_dad_work(struct work_struct *w);
 166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 167 static void addrconf_dad_run(struct inet6_dev *idev);
 168 static void addrconf_rs_timer(unsigned long data);
 169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 171
 172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 173                                 struct prefix_info *pinfo);
 174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 175                                struct net_device *dev);
 176
 177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 178         .forwarding             = 0,
 179         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 180         .mtu6                   = IPV6_MIN_MTU,
 181         .accept_ra              = 1,
 182         .accept_redirects       = 1,
 183         .autoconf               = 1,
 184         .force_mld_version      = 0,
 185         .mldv1_unsolicited_report_interval = 10 * HZ,
 186         .mldv2_unsolicited_report_interval = HZ,
 187         .dad_transmits          = 1,
 188         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 189         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 190         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 191         .use_tempaddr           = 0,
 192         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 193         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 194         .regen_max_retry        = REGEN_MAX_RETRY,
 195         .max_desync_factor      = MAX_DESYNC_FACTOR,
 196         .max_addresses          = IPV6_MAX_ADDRESSES,
 197         .accept_ra_defrtr       = 1,
 198         .accept_ra_from_local   = 0,
 199         .accept_ra_min_hop_limit= 1,
 200         .accept_ra_pinfo        = 1,
 201 #ifdef CONFIG_IPV6_ROUTER_PREF
 202         .accept_ra_rtr_pref     = 1,
 203         .rtr_probe_interval     = 60 * HZ,
 204 #ifdef CONFIG_IPV6_ROUTE_INFO
 205         .accept_ra_rt_info_max_plen = 0,
 206 #endif
 207 #endif
 208         .proxy_ndp              = 0,
 209         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 210         .disable_ipv6           = 0,
 211         .accept_dad             = 1,
 212         .suppress_frag_ndisc    = 1,
 213         .accept_ra_mtu          = 1,
 214         .stable_secret          = {
 215                 .initialized = false,
 216         },
 217         .use_oif_addrs_only     = 0,
 218         .ignore_routes_with_linkdown = 0,
 219 };
 220
 221 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 222         .forwarding             = 0,
 223         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 224         .mtu6                   = IPV6_MIN_MTU,
 225         .accept_ra              = 1,
 226         .accept_redirects       = 1,
 227         .autoconf               = 1,
 228         .force_mld_version      = 0,
 229         .mldv1_unsolicited_report_interval = 10 * HZ,
 230         .mldv2_unsolicited_report_interval = HZ,
 231         .dad_transmits          = 1,
 232         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 233         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 234         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 235         .use_tempaddr           = 0,
 236         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 237         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 238         .regen_max_retry        = REGEN_MAX_RETRY,
 239         .max_desync_factor      = MAX_DESYNC_FACTOR,
 240         .max_addresses          = IPV6_MAX_ADDRESSES,
 241         .accept_ra_defrtr       = 1,
 242         .accept_ra_from_local   = 0,
 243         .accept_ra_min_hop_limit= 1,
 244         .accept_ra_pinfo        = 1,
 245 #ifdef CONFIG_IPV6_ROUTER_PREF
 246         .accept_ra_rtr_pref     = 1,
 247         .rtr_probe_interval     = 60 * HZ,
 248 #ifdef CONFIG_IPV6_ROUTE_INFO
 249         .accept_ra_rt_info_max_plen = 0,
 250 #endif
 251 #endif
 252         .proxy_ndp              = 0,
 253         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 254         .disable_ipv6           = 0,
 255         .accept_dad             = 1,
 256         .suppress_frag_ndisc    = 1,
 257         .accept_ra_mtu          = 1,
 258         .stable_secret          = {
 259                 .initialized = false,
 260         },
 261         .use_oif_addrs_only     = 0,
 262         .ignore_routes_with_linkdown = 0,
 263 };
 264
 265 /* Check if a valid qdisc is available */
 266 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 267 {
 268         return !qdisc_tx_is_noop(dev);
 269 }
 270
 271 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 272 {
 273         if (del_timer(&idev->rs_timer))
 274                 __in6_dev_put(idev);
 275 }
 276
 277 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 278 {
 279         if (cancel_delayed_work(&ifp->dad_work))
 280                 __in6_ifa_put(ifp);
 281 }
 282
 283 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 284                                   unsigned long when)
 285 {
 286         if (!timer_pending(&idev->rs_timer))
 287                 in6_dev_hold(idev);
 288         mod_timer(&idev->rs_timer, jiffies + when);
 289 }
 290
 291 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 292                                    unsigned long delay)
 293 {
 294         if (!delayed_work_pending(&ifp->dad_work))
 295                 in6_ifa_hold(ifp);
 296         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 297 }
 298
 299 static int snmp6_alloc_dev(struct inet6_dev *idev)
 300 {
 301         int i;
 302
 303         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 304         if (!idev->stats.ipv6)
 305                 goto err_ip;
 306
 307         for_each_possible_cpu(i) {
 308                 struct ipstats_mib *addrconf_stats;
 309                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 310                 u64_stats_init(&addrconf_stats->syncp);
 311         }
 312
 313
 314         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 315                                         GFP_KERNEL);
 316         if (!idev->stats.icmpv6dev)
 317                 goto err_icmp;
 318         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 319                                            GFP_KERNEL);
 320         if (!idev->stats.icmpv6msgdev)
 321                 goto err_icmpmsg;
 322
 323         return 0;
 324
 325 err_icmpmsg:
 326         kfree(idev->stats.icmpv6dev);
 327 err_icmp:
 328         free_percpu(idev->stats.ipv6);
 329 err_ip:
 330         return -ENOMEM;
 331 }
 332
 333 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 334 {
 335         struct inet6_dev *ndev;
 336         int err = -ENOMEM;
 337
 338         ASSERT_RTNL();
 339
 340         if (dev->mtu < IPV6_MIN_MTU)
 341                 return ERR_PTR(-EINVAL);
 342
 343         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 344         if (!ndev)
 345                 return ERR_PTR(err);
 346
 347         rwlock_init(&ndev->lock);
 348         ndev->dev = dev;
 349         INIT_LIST_HEAD(&ndev->addr_list);
 350         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 351                     (unsigned long)ndev);
 352         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 353
 354         if (ndev->cnf.stable_secret.initialized)
 355                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 356         else
 357                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
 358
 359         ndev->cnf.mtu6 = dev->mtu;
 360         ndev->cnf.sysctl = NULL;
 361         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 362         if (!ndev->nd_parms) {
 363                 kfree(ndev);
 364                 return ERR_PTR(err);
 365         }
 366         if (ndev->cnf.forwarding)
 367                 dev_disable_lro(dev);
 368         /* We refer to the device */
 369         dev_hold(dev);
 370
 371         if (snmp6_alloc_dev(ndev) < 0) {
 372                 ADBG(KERN_WARNING
 373                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 374                         __func__, dev->name);
 375                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 376                 dev_put(dev);
 377                 kfree(ndev);
 378                 return ERR_PTR(err);
 379         }
 380
 381         if (snmp6_register_dev(ndev) < 0) {
 382                 ADBG(KERN_WARNING
 383                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 384                         __func__, dev->name);
 385                 goto err_release;
 386         }
 387
 388         /* One reference from device.  We must do this before
 389          * we invoke __ipv6_regen_rndid().
 390          */
 391         in6_dev_hold(ndev);
 392
 393         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 394                 ndev->cnf.accept_dad = -1;
 395
 396 #if IS_ENABLED(CONFIG_IPV6_SIT)
 397         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 398                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 399                 ndev->cnf.rtr_solicits = 0;
 400         }
 401 #endif
 402
 403         INIT_LIST_HEAD(&ndev->tempaddr_list);
 404         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 405         if ((dev->flags&IFF_LOOPBACK) ||
 406             dev->type == ARPHRD_TUNNEL ||
 407             dev->type == ARPHRD_TUNNEL6 ||
 408             dev->type == ARPHRD_SIT ||
 409             dev->type == ARPHRD_NONE) {
 410                 ndev->cnf.use_tempaddr = -1;
 411         } else {
 412                 in6_dev_hold(ndev);
 413                 ipv6_regen_rndid((unsigned long) ndev);
 414         }
 415
 416         ndev->token = in6addr_any;
 417
 418         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 419                 ndev->if_flags |= IF_READY;
 420
 421         ipv6_mc_init_dev(ndev);
 422         ndev->tstamp = jiffies;
 423         err = addrconf_sysctl_register(ndev);
 424         if (err) {
 425                 ipv6_mc_destroy_dev(ndev);
 426                 del_timer(&ndev->regen_timer);
 427                 snmp6_unregister_dev(ndev);
 428                 goto err_release;
 429         }
 430         /* protected by rtnl_lock */
 431         rcu_assign_pointer(dev->ip6_ptr, ndev);
 432
 433         /* Join interface-local all-node multicast group */
 434         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 435
 436         /* Join all-node multicast group */
 437         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 438
 439         /* Join all-router multicast group if forwarding is set */
 440         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 441                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 442
 443         return ndev;
 444
 445 err_release:
 446         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 447         ndev->dead = 1;
 448         in6_dev_finish_destroy(ndev);
 449         return ERR_PTR(err);
 450 }
 451
 452 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 453 {
 454         struct inet6_dev *idev;
 455
 456         ASSERT_RTNL();
 457
 458         idev = __in6_dev_get(dev);
 459         if (!idev) {
 460                 idev = ipv6_add_dev(dev);
 461                 if (IS_ERR(idev))
 462                         return NULL;
 463         }
 464
 465         if (dev->flags&IFF_UP)
 466                 ipv6_mc_up(idev);
 467         return idev;
 468 }
 469
 470 static int inet6_netconf_msgsize_devconf(int type)
 471 {
 472         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 473                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 474
 475         /* type -1 is used for ALL */
 476         if (type == -1 || type == NETCONFA_FORWARDING)
 477                 size += nla_total_size(4);
 478 #ifdef CONFIG_IPV6_MROUTE
 479         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 480                 size += nla_total_size(4);
 481 #endif
 482         if (type == -1 || type == NETCONFA_PROXY_NEIGH)
 483                 size += nla_total_size(4);
 484
 485         if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 486                 size += nla_total_size(4);
 487
 488         return size;
 489 }
 490
 491 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 492                                       struct ipv6_devconf *devconf, u32 portid,
 493                                       u32 seq, int event, unsigned int flags,
 494                                       int type)
 495 {
 496         struct nlmsghdr  *nlh;
 497         struct netconfmsg *ncm;
 498
 499         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 500                         flags);
 501         if (!nlh)
 502                 return -EMSGSIZE;
 503
 504         ncm = nlmsg_data(nlh);
 505         ncm->ncm_family = AF_INET6;
 506
 507         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 508                 goto nla_put_failure;
 509
 510         /* type -1 is used for ALL */
 511         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 512             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 513                 goto nla_put_failure;
 514 #ifdef CONFIG_IPV6_MROUTE
 515         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 516             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 517                         devconf->mc_forwarding) < 0)
 518                 goto nla_put_failure;
 519 #endif
 520         if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
 521             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 522                 goto nla_put_failure;
 523
 524         if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 525             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 526                         devconf->ignore_routes_with_linkdown) < 0)
 527                 goto nla_put_failure;
 528
 529         nlmsg_end(skb, nlh);
 530         return 0;
 531
 532 nla_put_failure:
 533         nlmsg_cancel(skb, nlh);
 534         return -EMSGSIZE;
 535 }
 536
 537 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 538                                   struct ipv6_devconf *devconf)
 539 {
 540         struct sk_buff *skb;
 541         int err = -ENOBUFS;
 542
 543         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 544         if (!skb)
 545                 goto errout;
 546
 547         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 548                                          RTM_NEWNETCONF, 0, type);
 549         if (err < 0) {
 550                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 551                 WARN_ON(err == -EMSGSIZE);
 552                 kfree_skb(skb);
 553                 goto errout;
 554         }
 555         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 556         return;
 557 errout:
 558         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 559 }
 560
 561 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 562         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 563         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 564         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 565         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 566 };
 567
 568 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 569                                      struct nlmsghdr *nlh)
 570 {
 571         struct net *net = sock_net(in_skb->sk);
 572         struct nlattr *tb[NETCONFA_MAX+1];
 573         struct netconfmsg *ncm;
 574         struct sk_buff *skb;
 575         struct ipv6_devconf *devconf;
 576         struct inet6_dev *in6_dev;
 577         struct net_device *dev;
 578         int ifindex;
 579         int err;
 580
 581         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 582                           devconf_ipv6_policy);
 583         if (err < 0)
 584                 goto errout;
 585
 586         err = EINVAL;
 587         if (!tb[NETCONFA_IFINDEX])
 588                 goto errout;
 589
 590         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 591         switch (ifindex) {
 592         case NETCONFA_IFINDEX_ALL:
 593                 devconf = net->ipv6.devconf_all;
 594                 break;
 595         case NETCONFA_IFINDEX_DEFAULT:
 596                 devconf = net->ipv6.devconf_dflt;
 597                 break;
 598         default:
 599                 dev = __dev_get_by_index(net, ifindex);
 600                 if (!dev)
 601                         goto errout;
 602                 in6_dev = __in6_dev_get(dev);
 603                 if (!in6_dev)
 604                         goto errout;
 605                 devconf = &in6_dev->cnf;
 606                 break;
 607         }
 608
 609         err = -ENOBUFS;
 610         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 611         if (!skb)
 612                 goto errout;
 613
 614         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 615                                          NETLINK_CB(in_skb).portid,
 616                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 617                                          -1);
 618         if (err < 0) {
 619                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 620                 WARN_ON(err == -EMSGSIZE);
 621                 kfree_skb(skb);
 622                 goto errout;
 623         }
 624         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 625 errout:
 626         return err;
 627 }
 628
 629 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 630                                       struct netlink_callback *cb)
 631 {
 632         struct net *net = sock_net(skb->sk);
 633         int h, s_h;
 634         int idx, s_idx;
 635         struct net_device *dev;
 636         struct inet6_dev *idev;
 637         struct hlist_head *head;
 638
 639         s_h = cb->args[0];
 640         s_idx = idx = cb->args[1];
 641
 642         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 643                 idx = 0;
 644                 head = &net->dev_index_head[h];
 645                 rcu_read_lock();
 646                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 647                           net->dev_base_seq;
 648                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 649                         if (idx < s_idx)
 650                                 goto cont;
 651                         idev = __in6_dev_get(dev);
 652                         if (!idev)
 653                                 goto cont;
 654
 655                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 656                                                        &idev->cnf,
 657                                                        NETLINK_CB(cb->skb).portid,
 658                                                        cb->nlh->nlmsg_seq,
 659                                                        RTM_NEWNETCONF,
 660                                                        NLM_F_MULTI,
 661                                                        -1) < 0) {
 662                                 rcu_read_unlock();
 663                                 goto done;
 664                         }
 665                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 666 cont:
 667                         idx++;
 668                 }
 669                 rcu_read_unlock();
 670         }
 671         if (h == NETDEV_HASHENTRIES) {
 672                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 673                                                net->ipv6.devconf_all,
 674                                                NETLINK_CB(cb->skb).portid,
 675                                                cb->nlh->nlmsg_seq,
 676                                                RTM_NEWNETCONF, NLM_F_MULTI,
 677                                                -1) < 0)
 678                         goto done;
 679                 else
 680                         h++;
 681         }
 682         if (h == NETDEV_HASHENTRIES + 1) {
 683                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 684                                                net->ipv6.devconf_dflt,
 685                                                NETLINK_CB(cb->skb).portid,
 686                                                cb->nlh->nlmsg_seq,
 687                                                RTM_NEWNETCONF, NLM_F_MULTI,
 688                                                -1) < 0)
 689                         goto done;
 690                 else
 691                         h++;
 692         }
 693 done:
 694         cb->args[0] = h;
 695         cb->args[1] = idx;
 696
 697         return skb->len;
 698 }
 699
 700 #ifdef CONFIG_SYSCTL
 701 static void dev_forward_change(struct inet6_dev *idev)
 702 {
 703         struct net_device *dev;
 704         struct inet6_ifaddr *ifa;
 705
 706         if (!idev)
 707                 return;
 708         dev = idev->dev;
 709         if (idev->cnf.forwarding)
 710                 dev_disable_lro(dev);
 711         if (dev->flags & IFF_MULTICAST) {
 712                 if (idev->cnf.forwarding) {
 713                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 714                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 715                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 716                 } else {
 717                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 718                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 719                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 720                 }
 721         }
 722
 723         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 724                 if (ifa->flags&IFA_F_TENTATIVE)
 725                         continue;
 726                 if (idev->cnf.forwarding)
 727                         addrconf_join_anycast(ifa);
 728                 else
 729                         addrconf_leave_anycast(ifa);
 730         }
 731         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 732                                      dev->ifindex, &idev->cnf);
 733 }
 734
 735
 736 static void addrconf_forward_change(struct net *net, __s32 newf)
 737 {
 738         struct net_device *dev;
 739         struct inet6_dev *idev;
 740
 741         for_each_netdev(net, dev) {
 742                 idev = __in6_dev_get(dev);
 743                 if (idev) {
 744                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 745                         idev->cnf.forwarding = newf;
 746                         if (changed)
 747                                 dev_forward_change(idev);
 748                 }
 749         }
 750 }
 751
 752 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 753 {
 754         struct net *net;
 755         int old;
 756
 757         if (!rtnl_trylock())
 758                 return restart_syscall();
 759
 760         net = (struct net *)table->extra2;
 761         old = *p;
 762         *p = newf;
 763
 764         if (p == &net->ipv6.devconf_dflt->forwarding) {
 765                 if ((!newf) ^ (!old))
 766                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 767                                                      NETCONFA_IFINDEX_DEFAULT,
 768                                                      net->ipv6.devconf_dflt);
 769                 rtnl_unlock();
 770                 return 0;
 771         }
 772
 773         if (p == &net->ipv6.devconf_all->forwarding) {
 774                 net->ipv6.devconf_dflt->forwarding = newf;
 775                 addrconf_forward_change(net, newf);
 776                 if ((!newf) ^ (!old))
 777                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 778                                                      NETCONFA_IFINDEX_ALL,
 779                                                      net->ipv6.devconf_all);
 780         } else if ((!newf) ^ (!old))
 781                 dev_forward_change((struct inet6_dev *)table->extra1);
 782         rtnl_unlock();
 783
 784         if (newf)
 785                 rt6_purge_dflt_routers(net);
 786         return 1;
 787 }
 788
 789 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 790 {
 791         struct net_device *dev;
 792         struct inet6_dev *idev;
 793
 794         for_each_netdev(net, dev) {
 795                 idev = __in6_dev_get(dev);
 796                 if (idev) {
 797                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 798
 799                         idev->cnf.ignore_routes_with_linkdown = newf;
 800                         if (changed)
 801                                 inet6_netconf_notify_devconf(dev_net(dev),
 802                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 803                                                              dev->ifindex,
 804                                                              &idev->cnf);
 805                 }
 806         }
 807 }
 808
 809 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 810 {
 811         struct net *net;
 812         int old;
 813
 814         if (!rtnl_trylock())
 815                 return restart_syscall();
 816
 817         net = (struct net *)table->extra2;
 818         old = *p;
 819         *p = newf;
 820
 821         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 822                 if ((!newf) ^ (!old))
 823                         inet6_netconf_notify_devconf(net,
 824                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 825                                                      NETCONFA_IFINDEX_DEFAULT,
 826                                                      net->ipv6.devconf_dflt);
 827                 rtnl_unlock();
 828                 return 0;
 829         }
 830
 831         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 832                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 833                 addrconf_linkdown_change(net, newf);
 834                 if ((!newf) ^ (!old))
 835                         inet6_netconf_notify_devconf(net,
 836                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 837                                                      NETCONFA_IFINDEX_ALL,
 838                                                      net->ipv6.devconf_all);
 839         }
 840         rtnl_unlock();
 841
 842         return 1;
 843 }
 844
 845 #endif
 846
 847 /* Nobody refers to this ifaddr, destroy it */
 848 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 849 {
 850         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 851
 852 #ifdef NET_REFCNT_DEBUG
 853         pr_debug("%s\n", __func__);
 854 #endif
 855
 856         in6_dev_put(ifp->idev);
 857
 858         if (cancel_delayed_work(&ifp->dad_work))
 859                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 860                           ifp);
 861
 862         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 863                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 864                 return;
 865         }
 866         ip6_rt_put(ifp->rt);
 867
 868         kfree_rcu(ifp, rcu);
 869 }
 870
 871 static void
 872 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 873 {
 874         struct list_head *p;
 875         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 876
 877         /*
 878          * Each device address list is sorted in order of scope -
 879          * global before linklocal.
 880          */
 881         list_for_each(p, &idev->addr_list) {
 882                 struct inet6_ifaddr *ifa
 883                         = list_entry(p, struct inet6_ifaddr, if_list);
 884                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 885                         break;
 886         }
 887
 888         list_add_tail(&ifp->if_list, p);
 889 }
 890
 891 static u32 inet6_addr_hash(const struct in6_addr *addr)
 892 {
 893         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 894 }
 895
 896 /* On success it returns ifp with increased reference count */
 897
 898 static struct inet6_ifaddr *
 899 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 900               const struct in6_addr *peer_addr, int pfxlen,
 901               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 902 {
 903         struct inet6_ifaddr *ifa = NULL;
 904         struct rt6_info *rt;
 905         unsigned int hash;
 906         int err = 0;
 907         int addr_type = ipv6_addr_type(addr);
 908
 909         if (addr_type == IPV6_ADDR_ANY ||
 910             addr_type & IPV6_ADDR_MULTICAST ||
 911             (!(idev->dev->flags & IFF_LOOPBACK) &&
 912              addr_type & IPV6_ADDR_LOOPBACK))
 913                 return ERR_PTR(-EADDRNOTAVAIL);
 914
 915         rcu_read_lock_bh();
 916         if (idev->dead) {
 917                 err = -ENODEV;                  /*XXX*/
 918                 goto out2;
 919         }
 920
 921         if (idev->cnf.disable_ipv6) {
 922                 err = -EACCES;
 923                 goto out2;
 924         }
 925
 926         spin_lock(&addrconf_hash_lock);
 927
 928         /* Ignore adding duplicate addresses on an interface */
 929         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 930                 ADBG("ipv6_add_addr: already assigned\n");
 931                 err = -EEXIST;
 932                 goto out;
 933         }
 934
 935         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 936
 937         if (!ifa) {
 938                 ADBG("ipv6_add_addr: malloc failed\n");
 939                 err = -ENOBUFS;
 940                 goto out;
 941         }
 942
 943         rt = addrconf_dst_alloc(idev, addr, false);
 944         if (IS_ERR(rt)) {
 945                 err = PTR_ERR(rt);
 946                 goto out;
 947         }
 948
 949         neigh_parms_data_state_setall(idev->nd_parms);
 950
 951         ifa->addr = *addr;
 952         if (peer_addr)
 953                 ifa->peer_addr = *peer_addr;
 954
 955         spin_lock_init(&ifa->lock);
 956         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 957         INIT_HLIST_NODE(&ifa->addr_lst);
 958         ifa->scope = scope;
 959         ifa->prefix_len = pfxlen;
 960         ifa->flags = flags | IFA_F_TENTATIVE;
 961         ifa->valid_lft = valid_lft;
 962         ifa->prefered_lft = prefered_lft;
 963         ifa->cstamp = ifa->tstamp = jiffies;
 964         ifa->tokenized = false;
 965
 966         ifa->rt = rt;
 967
 968         ifa->idev = idev;
 969         in6_dev_hold(idev);
 970         /* For caller */
 971         in6_ifa_hold(ifa);
 972
 973         /* Add to big hash table */
 974         hash = inet6_addr_hash(addr);
 975
 976         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 977         spin_unlock(&addrconf_hash_lock);
 978
 979         write_lock(&idev->lock);
 980         /* Add to inet6_dev unicast addr list. */
 981         ipv6_link_dev_addr(idev, ifa);
 982
 983         if (ifa->flags&IFA_F_TEMPORARY) {
 984                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 985                 in6_ifa_hold(ifa);
 986         }
 987
 988         in6_ifa_hold(ifa);
 989         write_unlock(&idev->lock);
 990 out2:
 991         rcu_read_unlock_bh();
 992
 993         if (likely(err == 0))
 994                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 995         else {
 996                 kfree(ifa);
 997                 ifa = ERR_PTR(err);
 998         }
 999
1000         return ifa;
1001 out:
1002         spin_unlock(&addrconf_hash_lock);
1003         goto out2;
1004 }
1005
1006 enum cleanup_prefix_rt_t {
1007         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1008         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1009         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1010 };
1011
1012 /*
1013  * Check, whether the prefix for ifp would still need a prefix route
1014  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1015  * constants.
1016  *
1017  * 1) we don't purge prefix if address was not permanent.
1018  *    prefix is managed by its own lifetime.
1019  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1020  * 3) if there are no addresses, delete prefix.
1021  * 4) if there are still other permanent address(es),
1022  *    corresponding prefix is still permanent.
1023  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1024  *    don't purge the prefix, assume user space is managing it.
1025  * 6) otherwise, update prefix lifetime to the
1026  *    longest valid lifetime among the corresponding
1027  *    addresses on the device.
1028  *    Note: subsequent RA will update lifetime.
1029  **/
1030 static enum cleanup_prefix_rt_t
1031 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1032 {
1033         struct inet6_ifaddr *ifa;
1034         struct inet6_dev *idev = ifp->idev;
1035         unsigned long lifetime;
1036         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1037
1038         *expires = jiffies;
1039
1040         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1041                 if (ifa == ifp)
1042                         continue;
1043                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1044                                        ifp->prefix_len))
1045                         continue;
1046                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1047                         return CLEANUP_PREFIX_RT_NOP;
1048
1049                 action = CLEANUP_PREFIX_RT_EXPIRE;
1050
1051                 spin_lock(&ifa->lock);
1052
1053                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1054                 /*
1055                  * Note: Because this address is
1056                  * not permanent, lifetime <
1057                  * LONG_MAX / HZ here.
1058                  */
1059                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1060                         *expires = ifa->tstamp + lifetime * HZ;
1061                 spin_unlock(&ifa->lock);
1062         }
1063
1064         return action;
1065 }
1066
1067 static void
1068 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1069 {
1070         struct rt6_info *rt;
1071
1072         rt = addrconf_get_prefix_route(&ifp->addr,
1073                                        ifp->prefix_len,
1074                                        ifp->idev->dev,
1075                                        0, RTF_GATEWAY | RTF_DEFAULT);
1076         if (rt) {
1077                 if (del_rt)
1078                         ip6_del_rt(rt);
1079                 else {
1080                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1081                                 rt6_set_expires(rt, expires);
1082                         ip6_rt_put(rt);
1083                 }
1084         }
1085 }
1086
1087
1088 /* This function wants to get referenced ifp and releases it before return */
1089
1090 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1091 {
1092         int state;
1093         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1094         unsigned long expires;
1095
1096         ASSERT_RTNL();
1097
1098         spin_lock_bh(&ifp->lock);
1099         state = ifp->state;
1100         ifp->state = INET6_IFADDR_STATE_DEAD;
1101         spin_unlock_bh(&ifp->lock);
1102
1103         if (state == INET6_IFADDR_STATE_DEAD)
1104                 goto out;
1105
1106         spin_lock_bh(&addrconf_hash_lock);
1107         hlist_del_init_rcu(&ifp->addr_lst);
1108         spin_unlock_bh(&addrconf_hash_lock);
1109
1110         write_lock_bh(&ifp->idev->lock);
1111
1112         if (ifp->flags&IFA_F_TEMPORARY) {
1113                 list_del(&ifp->tmp_list);
1114                 if (ifp->ifpub) {
1115                         in6_ifa_put(ifp->ifpub);
1116                         ifp->ifpub = NULL;
1117                 }
1118                 __in6_ifa_put(ifp);
1119         }
1120
1121         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1122                 action = check_cleanup_prefix_route(ifp, &expires);
1123
1124         list_del_init(&ifp->if_list);
1125         __in6_ifa_put(ifp);
1126
1127         write_unlock_bh(&ifp->idev->lock);
1128
1129         addrconf_del_dad_work(ifp);
1130
1131         ipv6_ifa_notify(RTM_DELADDR, ifp);
1132
1133         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1134
1135         if (action != CLEANUP_PREFIX_RT_NOP) {
1136                 cleanup_prefix_route(ifp, expires,
1137                         action == CLEANUP_PREFIX_RT_DEL);
1138         }
1139
1140         /* clean up prefsrc entries */
1141         rt6_remove_prefsrc(ifp);
1142 out:
1143         in6_ifa_put(ifp);
1144 }
1145
1146 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1147 {
1148         struct inet6_dev *idev = ifp->idev;
1149         struct in6_addr addr, *tmpaddr;
1150         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1151         unsigned long regen_advance;
1152         int tmp_plen;
1153         int ret = 0;
1154         u32 addr_flags;
1155         unsigned long now = jiffies;
1156
1157         write_lock_bh(&idev->lock);
1158         if (ift) {
1159                 spin_lock_bh(&ift->lock);
1160                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1161                 spin_unlock_bh(&ift->lock);
1162                 tmpaddr = &addr;
1163         } else {
1164                 tmpaddr = NULL;
1165         }
1166 retry:
1167         in6_dev_hold(idev);
1168         if (idev->cnf.use_tempaddr <= 0) {
1169                 write_unlock_bh(&idev->lock);
1170                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1171                 in6_dev_put(idev);
1172                 ret = -1;
1173                 goto out;
1174         }
1175         spin_lock_bh(&ifp->lock);
1176         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1177                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1178                 spin_unlock_bh(&ifp->lock);
1179                 write_unlock_bh(&idev->lock);
1180                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1181                         __func__);
1182                 in6_dev_put(idev);
1183                 ret = -1;
1184                 goto out;
1185         }
1186         in6_ifa_hold(ifp);
1187         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1188         __ipv6_try_regen_rndid(idev, tmpaddr);
1189         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1190         age = (now - ifp->tstamp) / HZ;
1191         tmp_valid_lft = min_t(__u32,
1192                               ifp->valid_lft,
1193                               idev->cnf.temp_valid_lft + age);
1194         tmp_prefered_lft = min_t(__u32,
1195                                  ifp->prefered_lft,
1196                                  idev->cnf.temp_prefered_lft + age -
1197                                  idev->cnf.max_desync_factor);
1198         tmp_plen = ifp->prefix_len;
1199         tmp_tstamp = ifp->tstamp;
1200         spin_unlock_bh(&ifp->lock);
1201
1202         regen_advance = idev->cnf.regen_max_retry *
1203                         idev->cnf.dad_transmits *
1204                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1205         write_unlock_bh(&idev->lock);
1206
1207         /* A temporary address is created only if this calculated Preferred
1208          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1209          * an implementation must not create a temporary address with a zero
1210          * Preferred Lifetime.
1211          * Use age calculation as in addrconf_verify to avoid unnecessary
1212          * temporary addresses being generated.
1213          */
1214         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1215         if (tmp_prefered_lft <= regen_advance + age) {
1216                 in6_ifa_put(ifp);
1217                 in6_dev_put(idev);
1218                 ret = -1;
1219                 goto out;
1220         }
1221
1222         addr_flags = IFA_F_TEMPORARY;
1223         /* set in addrconf_prefix_rcv() */
1224         if (ifp->flags & IFA_F_OPTIMISTIC)
1225                 addr_flags |= IFA_F_OPTIMISTIC;
1226
1227         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1228                             ipv6_addr_scope(&addr), addr_flags,
1229                             tmp_valid_lft, tmp_prefered_lft);
1230         if (IS_ERR(ift)) {
1231                 in6_ifa_put(ifp);
1232                 in6_dev_put(idev);
1233                 pr_info("%s: retry temporary address regeneration\n", __func__);
1234                 tmpaddr = &addr;
1235                 write_lock_bh(&idev->lock);
1236                 goto retry;
1237         }
1238
1239         spin_lock_bh(&ift->lock);
1240         ift->ifpub = ifp;
1241         ift->cstamp = now;
1242         ift->tstamp = tmp_tstamp;
1243         spin_unlock_bh(&ift->lock);
1244
1245         addrconf_dad_start(ift);
1246         in6_ifa_put(ift);
1247         in6_dev_put(idev);
1248 out:
1249         return ret;
1250 }
1251
1252 /*
1253  *      Choose an appropriate source address (RFC3484)
1254  */
1255 enum {
1256         IPV6_SADDR_RULE_INIT = 0,
1257         IPV6_SADDR_RULE_LOCAL,
1258         IPV6_SADDR_RULE_SCOPE,
1259         IPV6_SADDR_RULE_PREFERRED,
1260 #ifdef CONFIG_IPV6_MIP6
1261         IPV6_SADDR_RULE_HOA,
1262 #endif
1263         IPV6_SADDR_RULE_OIF,
1264         IPV6_SADDR_RULE_LABEL,
1265         IPV6_SADDR_RULE_PRIVACY,
1266         IPV6_SADDR_RULE_ORCHID,
1267         IPV6_SADDR_RULE_PREFIX,
1268 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1269         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1270 #endif
1271         IPV6_SADDR_RULE_MAX
1272 };
1273
1274 struct ipv6_saddr_score {
1275         int                     rule;
1276         int                     addr_type;
1277         struct inet6_ifaddr     *ifa;
1278         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1279         int                     scopedist;
1280         int                     matchlen;
1281 };
1282
1283 struct ipv6_saddr_dst {
1284         const struct in6_addr *addr;
1285         int ifindex;
1286         int scope;
1287         int label;
1288         unsigned int prefs;
1289 };
1290
1291 static inline int ipv6_saddr_preferred(int type)
1292 {
1293         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1294                 return 1;
1295         return 0;
1296 }
1297
1298 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1299 {
1300 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1301         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1302 #else
1303         return false;
1304 #endif
1305 }
1306
1307 static int ipv6_get_saddr_eval(struct net *net,
1308                                struct ipv6_saddr_score *score,
1309                                struct ipv6_saddr_dst *dst,
1310                                int i)
1311 {
1312         int ret;
1313
1314         if (i <= score->rule) {
1315                 switch (i) {
1316                 case IPV6_SADDR_RULE_SCOPE:
1317                         ret = score->scopedist;
1318                         break;
1319                 case IPV6_SADDR_RULE_PREFIX:
1320                         ret = score->matchlen;
1321                         break;
1322                 default:
1323                         ret = !!test_bit(i, score->scorebits);
1324                 }
1325                 goto out;
1326         }
1327
1328         switch (i) {
1329         case IPV6_SADDR_RULE_INIT:
1330                 /* Rule 0: remember if hiscore is not ready yet */
1331                 ret = !!score->ifa;
1332                 break;
1333         case IPV6_SADDR_RULE_LOCAL:
1334                 /* Rule 1: Prefer same address */
1335                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1336                 break;
1337         case IPV6_SADDR_RULE_SCOPE:
1338                 /* Rule 2: Prefer appropriate scope
1339                  *
1340                  *      ret
1341                  *       ^
1342                  *    -1 |  d 15
1343                  *    ---+--+-+---> scope
1344                  *       |
1345                  *       |             d is scope of the destination.
1346                  *  B-d  |  \
1347                  *       |   \      <- smaller scope is better if
1348                  *  B-15 |    \        if scope is enough for destination.
1349                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1350                  * d-C-1 | /
1351                  *       |/         <- greater is better
1352                  *   -C  /             if scope is not enough for destination.
1353                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1354                  *
1355                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1356                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1357                  * Assume B = 0 and we get C > 29.
1358                  */
1359                 ret = __ipv6_addr_src_scope(score->addr_type);
1360                 if (ret >= dst->scope)
1361                         ret = -ret;
1362                 else
1363                         ret -= 128;     /* 30 is enough */
1364                 score->scopedist = ret;
1365                 break;
1366         case IPV6_SADDR_RULE_PREFERRED:
1367             {
1368                 /* Rule 3: Avoid deprecated and optimistic addresses */
1369                 u8 avoid = IFA_F_DEPRECATED;
1370
1371                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1372                         avoid |= IFA_F_OPTIMISTIC;
1373                 ret = ipv6_saddr_preferred(score->addr_type) ||
1374                       !(score->ifa->flags & avoid);
1375                 break;
1376             }
1377 #ifdef CONFIG_IPV6_MIP6
1378         case IPV6_SADDR_RULE_HOA:
1379             {
1380                 /* Rule 4: Prefer home address */
1381                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1382                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1383                 break;
1384             }
1385 #endif
1386         case IPV6_SADDR_RULE_OIF:
1387                 /* Rule 5: Prefer outgoing interface */
1388                 ret = (!dst->ifindex ||
1389                        dst->ifindex == score->ifa->idev->dev->ifindex);
1390                 break;
1391         case IPV6_SADDR_RULE_LABEL:
1392                 /* Rule 6: Prefer matching label */
1393                 ret = ipv6_addr_label(net,
1394                                       &score->ifa->addr, score->addr_type,
1395                                       score->ifa->idev->dev->ifindex) == dst->label;
1396                 break;
1397         case IPV6_SADDR_RULE_PRIVACY:
1398             {
1399                 /* Rule 7: Prefer public address
1400                  * Note: prefer temporary address if use_tempaddr >= 2
1401                  */
1402                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1403                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1404                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1405                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1406                 break;
1407             }
1408         case IPV6_SADDR_RULE_ORCHID:
1409                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1410                  *          non-ORCHID vs non-ORCHID
1411                  */
1412                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1413                         ipv6_addr_orchid(dst->addr));
1414                 break;
1415         case IPV6_SADDR_RULE_PREFIX:
1416                 /* Rule 8: Use longest matching prefix */
1417                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1418                 if (ret > score->ifa->prefix_len)
1419                         ret = score->ifa->prefix_len;
1420                 score->matchlen = ret;
1421                 break;
1422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1423         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1424                 /* Optimistic addresses still have lower precedence than other
1425                  * preferred addresses.
1426                  */
1427                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1428                 break;
1429 #endif
1430         default:
1431                 ret = 0;
1432         }
1433
1434         if (ret)
1435                 __set_bit(i, score->scorebits);
1436         score->rule = i;
1437 out:
1438         return ret;
1439 }
1440
1441 static int __ipv6_dev_get_saddr(struct net *net,
1442                                 struct ipv6_saddr_dst *dst,
1443                                 struct inet6_dev *idev,
1444                                 struct ipv6_saddr_score *scores,
1445                                 int hiscore_idx)
1446 {
1447         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1448
1449         read_lock_bh(&idev->lock);
1450         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1451                 int i;
1452
1453                 /*
1454                  * - Tentative Address (RFC2462 section 5.4)
1455                  *  - A tentative address is not considered
1456                  *    "assigned to an interface" in the traditional
1457                  *    sense, unless it is also flagged as optimistic.
1458                  * - Candidate Source Address (section 4)
1459                  *  - In any case, anycast addresses, multicast
1460                  *    addresses, and the unspecified address MUST
1461                  *    NOT be included in a candidate set.
1462                  */
1463                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1464                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1465                         continue;
1466
1467                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1468
1469                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1470                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1471                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1472                                             idev->dev->name);
1473                         continue;
1474                 }
1475
1476                 score->rule = -1;
1477                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1478
1479                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1480                         int minihiscore, miniscore;
1481
1482                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1483                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1484
1485                         if (minihiscore > miniscore) {
1486                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1487                                     score->scopedist > 0) {
1488                                         /*
1489                                          * special case:
1490                                          * each remaining entry
1491                                          * has too small (not enough)
1492                                          * scope, because ifa entries
1493                                          * are sorted by their scope
1494                                          * values.
1495                                          */
1496                                         goto out;
1497                                 }
1498                                 break;
1499                         } else if (minihiscore < miniscore) {
1500                                 if (hiscore->ifa)
1501                                         in6_ifa_put(hiscore->ifa);
1502
1503                                 in6_ifa_hold(score->ifa);
1504
1505                                 swap(hiscore, score);
1506                                 hiscore_idx = 1 - hiscore_idx;
1507
1508                                 /* restore our iterator */
1509                                 score->ifa = hiscore->ifa;
1510
1511                                 break;
1512                         }
1513                 }
1514         }
1515 out:
1516         read_unlock_bh(&idev->lock);
1517         return hiscore_idx;
1518 }
1519
1520 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1521                        const struct in6_addr *daddr, unsigned int prefs,
1522                        struct in6_addr *saddr)
1523 {
1524         struct ipv6_saddr_score scores[2], *hiscore;
1525         struct ipv6_saddr_dst dst;
1526         struct inet6_dev *idev;
1527         struct net_device *dev;
1528         int dst_type;
1529         bool use_oif_addr = false;
1530         int hiscore_idx = 0;
1531
1532         dst_type = __ipv6_addr_type(daddr);
1533         dst.addr = daddr;
1534         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1535         dst.scope = __ipv6_addr_src_scope(dst_type);
1536         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1537         dst.prefs = prefs;
1538
1539         scores[hiscore_idx].rule = -1;
1540         scores[hiscore_idx].ifa = NULL;
1541
1542         rcu_read_lock();
1543
1544         /* Candidate Source Address (section 4)
1545          *  - multicast and link-local destination address,
1546          *    the set of candidate source address MUST only
1547          *    include addresses assigned to interfaces
1548          *    belonging to the same link as the outgoing
1549          *    interface.
1550          * (- For site-local destination addresses, the
1551          *    set of candidate source addresses MUST only
1552          *    include addresses assigned to interfaces
1553          *    belonging to the same site as the outgoing
1554          *    interface.)
1555          *  - "It is RECOMMENDED that the candidate source addresses
1556          *    be the set of unicast addresses assigned to the
1557          *    interface that will be used to send to the destination
1558          *    (the 'outgoing' interface)." (RFC 6724)
1559          */
1560         if (dst_dev) {
1561                 idev = __in6_dev_get(dst_dev);
1562                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1563                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1564                     (idev && idev->cnf.use_oif_addrs_only)) {
1565                         use_oif_addr = true;
1566                 }
1567         }
1568
1569         if (use_oif_addr) {
1570                 if (idev)
1571                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1572         } else {
1573                 for_each_netdev_rcu(net, dev) {
1574                         idev = __in6_dev_get(dev);
1575                         if (!idev)
1576                                 continue;
1577                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1578                 }
1579         }
1580         rcu_read_unlock();
1581
1582         hiscore = &scores[hiscore_idx];
1583         if (!hiscore->ifa)
1584                 return -EADDRNOTAVAIL;
1585
1586         *saddr = hiscore->ifa->addr;
1587         in6_ifa_put(hiscore->ifa);
1588         return 0;
1589 }
1590 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1591
1592 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1593                       u32 banned_flags)
1594 {
1595         struct inet6_ifaddr *ifp;
1596         int err = -EADDRNOTAVAIL;
1597
1598         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1599                 if (ifp->scope > IFA_LINK)
1600                         break;
1601                 if (ifp->scope == IFA_LINK &&
1602                     !(ifp->flags & banned_flags)) {
1603                         *addr = ifp->addr;
1604                         err = 0;
1605                         break;
1606                 }
1607         }
1608         return err;
1609 }
1610
1611 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1612                     u32 banned_flags)
1613 {
1614         struct inet6_dev *idev;
1615         int err = -EADDRNOTAVAIL;
1616
1617         rcu_read_lock();
1618         idev = __in6_dev_get(dev);
1619         if (idev) {
1620                 read_lock_bh(&idev->lock);
1621                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1622                 read_unlock_bh(&idev->lock);
1623         }
1624         rcu_read_unlock();
1625         return err;
1626 }
1627
1628 static int ipv6_count_addresses(struct inet6_dev *idev)
1629 {
1630         int cnt = 0;
1631         struct inet6_ifaddr *ifp;
1632
1633         read_lock_bh(&idev->lock);
1634         list_for_each_entry(ifp, &idev->addr_list, if_list)
1635                 cnt++;
1636         read_unlock_bh(&idev->lock);
1637         return cnt;
1638 }
1639
1640 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1641                   const struct net_device *dev, int strict)
1642 {
1643         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1644 }
1645 EXPORT_SYMBOL(ipv6_chk_addr);
1646
1647 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1648                             const struct net_device *dev, int strict,
1649                             u32 banned_flags)
1650 {
1651         struct inet6_ifaddr *ifp;
1652         unsigned int hash = inet6_addr_hash(addr);
1653         u32 ifp_flags;
1654
1655         rcu_read_lock_bh();
1656         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1657                 if (!net_eq(dev_net(ifp->idev->dev), net))
1658                         continue;
1659                 /* Decouple optimistic from tentative for evaluation here.
1660                  * Ban optimistic addresses explicitly, when required.
1661                  */
1662                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1663                             ? (ifp->flags&~IFA_F_TENTATIVE)
1664                             : ifp->flags;
1665                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1666                     !(ifp_flags&banned_flags) &&
1667                     (!dev || ifp->idev->dev == dev ||
1668                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1669                         rcu_read_unlock_bh();
1670                         return 1;
1671                 }
1672         }
1673
1674         rcu_read_unlock_bh();
1675         return 0;
1676 }
1677 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1678
1679 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1680                                struct net_device *dev)
1681 {
1682         unsigned int hash = inet6_addr_hash(addr);
1683         struct inet6_ifaddr *ifp;
1684
1685         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1686                 if (!net_eq(dev_net(ifp->idev->dev), net))
1687                         continue;
1688                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1689                         if (!dev || ifp->idev->dev == dev)
1690                                 return true;
1691                 }
1692         }
1693         return false;
1694 }
1695
1696 /* Compares an address/prefix_len with addresses on device @dev.
1697  * If one is found it returns true.
1698  */
1699 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1700         const unsigned int prefix_len, struct net_device *dev)
1701 {
1702         struct inet6_dev *idev;
1703         struct inet6_ifaddr *ifa;
1704         bool ret = false;
1705
1706         rcu_read_lock();
1707         idev = __in6_dev_get(dev);
1708         if (idev) {
1709                 read_lock_bh(&idev->lock);
1710                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1711                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1712                         if (ret)
1713                                 break;
1714                 }
1715                 read_unlock_bh(&idev->lock);
1716         }
1717         rcu_read_unlock();
1718
1719         return ret;
1720 }
1721 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1722
1723 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1724 {
1725         struct inet6_dev *idev;
1726         struct inet6_ifaddr *ifa;
1727         int     onlink;
1728
1729         onlink = 0;
1730         rcu_read_lock();
1731         idev = __in6_dev_get(dev);
1732         if (idev) {
1733                 read_lock_bh(&idev->lock);
1734                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1735                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1736                                                    ifa->prefix_len);
1737                         if (onlink)
1738                                 break;
1739                 }
1740                 read_unlock_bh(&idev->lock);
1741         }
1742         rcu_read_unlock();
1743         return onlink;
1744 }
1745 EXPORT_SYMBOL(ipv6_chk_prefix);
1746
1747 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1748                                      struct net_device *dev, int strict)
1749 {
1750         struct inet6_ifaddr *ifp, *result = NULL;
1751         unsigned int hash = inet6_addr_hash(addr);
1752
1753         rcu_read_lock_bh();
1754         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1755                 if (!net_eq(dev_net(ifp->idev->dev), net))
1756                         continue;
1757                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1758                         if (!dev || ifp->idev->dev == dev ||
1759                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1760                                 result = ifp;
1761                                 in6_ifa_hold(ifp);
1762                                 break;
1763                         }
1764                 }
1765         }
1766         rcu_read_unlock_bh();
1767
1768         return result;
1769 }
1770
1771 /* Gets referenced address, destroys ifaddr */
1772
1773 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1774 {
1775         if (ifp->flags&IFA_F_PERMANENT) {
1776                 spin_lock_bh(&ifp->lock);
1777                 addrconf_del_dad_work(ifp);
1778                 ifp->flags |= IFA_F_TENTATIVE;
1779                 if (dad_failed)
1780                         ifp->flags |= IFA_F_DADFAILED;
1781                 spin_unlock_bh(&ifp->lock);
1782                 if (dad_failed)
1783                         ipv6_ifa_notify(0, ifp);
1784                 in6_ifa_put(ifp);
1785         } else if (ifp->flags&IFA_F_TEMPORARY) {
1786                 struct inet6_ifaddr *ifpub;
1787                 spin_lock_bh(&ifp->lock);
1788                 ifpub = ifp->ifpub;
1789                 if (ifpub) {
1790                         in6_ifa_hold(ifpub);
1791                         spin_unlock_bh(&ifp->lock);
1792                         ipv6_create_tempaddr(ifpub, ifp);
1793                         in6_ifa_put(ifpub);
1794                 } else {
1795                         spin_unlock_bh(&ifp->lock);
1796                 }
1797                 ipv6_del_addr(ifp);
1798         } else {
1799                 ipv6_del_addr(ifp);
1800         }
1801 }
1802
1803 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1804 {
1805         int err = -ENOENT;
1806
1807         spin_lock_bh(&ifp->lock);
1808         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1809                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1810                 err = 0;
1811         }
1812         spin_unlock_bh(&ifp->lock);
1813
1814         return err;
1815 }
1816
1817 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1818 {
1819         struct in6_addr addr;
1820         struct inet6_dev *idev = ifp->idev;
1821         struct net *net = dev_net(ifp->idev->dev);
1822
1823         if (addrconf_dad_end(ifp)) {
1824                 in6_ifa_put(ifp);
1825                 return;
1826         }
1827
1828         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1829                              ifp->idev->dev->name, &ifp->addr);
1830
1831         spin_lock_bh(&ifp->lock);
1832
1833         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1834                 int scope = ifp->scope;
1835                 u32 flags = ifp->flags;
1836                 struct in6_addr new_addr;
1837                 struct inet6_ifaddr *ifp2;
1838                 u32 valid_lft, preferred_lft;
1839                 int pfxlen = ifp->prefix_len;
1840                 int retries = ifp->stable_privacy_retry + 1;
1841
1842                 if (retries > net->ipv6.sysctl.idgen_retries) {
1843                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1844                                              ifp->idev->dev->name);
1845                         goto errdad;
1846                 }
1847
1848                 new_addr = ifp->addr;
1849                 if (ipv6_generate_stable_address(&new_addr, retries,
1850                                                  idev))
1851                         goto errdad;
1852
1853                 valid_lft = ifp->valid_lft;
1854                 preferred_lft = ifp->prefered_lft;
1855
1856                 spin_unlock_bh(&ifp->lock);
1857
1858                 if (idev->cnf.max_addresses &&
1859                     ipv6_count_addresses(idev) >=
1860                     idev->cnf.max_addresses)
1861                         goto lock_errdad;
1862
1863                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1864                                      ifp->idev->dev->name);
1865
1866                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1867                                      scope, flags, valid_lft,
1868                                      preferred_lft);
1869                 if (IS_ERR(ifp2))
1870                         goto lock_errdad;
1871
1872                 spin_lock_bh(&ifp2->lock);
1873                 ifp2->stable_privacy_retry = retries;
1874                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1875                 spin_unlock_bh(&ifp2->lock);
1876
1877                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1878                 in6_ifa_put(ifp2);
1879 lock_errdad:
1880                 spin_lock_bh(&ifp->lock);
1881         } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1882                 addr.s6_addr32[0] = htonl(0xfe800000);
1883                 addr.s6_addr32[1] = 0;
1884
1885                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1886                     ipv6_addr_equal(&ifp->addr, &addr)) {
1887                         /* DAD failed for link-local based on MAC address */
1888                         idev->cnf.disable_ipv6 = 1;
1889
1890                         pr_info("%s: IPv6 being disabled!\n",
1891                                 ifp->idev->dev->name);
1892                 }
1893         }
1894
1895 errdad:
1896         /* transition from _POSTDAD to _ERRDAD */
1897         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1898         spin_unlock_bh(&ifp->lock);
1899
1900         addrconf_mod_dad_work(ifp, 0);
1901 }
1902
1903 /* Join to solicited addr multicast group.
1904  * caller must hold RTNL */
1905 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1906 {
1907         struct in6_addr maddr;
1908
1909         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1910                 return;
1911
1912         addrconf_addr_solict_mult(addr, &maddr);
1913         ipv6_dev_mc_inc(dev, &maddr);
1914 }
1915
1916 /* caller must hold RTNL */
1917 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1918 {
1919         struct in6_addr maddr;
1920
1921         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1922                 return;
1923
1924         addrconf_addr_solict_mult(addr, &maddr);
1925         __ipv6_dev_mc_dec(idev, &maddr);
1926 }
1927
1928 /* caller must hold RTNL */
1929 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1930 {
1931         struct in6_addr addr;
1932
1933         if (ifp->prefix_len >= 127) /* RFC 6164 */
1934                 return;
1935         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1936         if (ipv6_addr_any(&addr))
1937                 return;
1938         __ipv6_dev_ac_inc(ifp->idev, &addr);
1939 }
1940
1941 /* caller must hold RTNL */
1942 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1943 {
1944         struct in6_addr addr;
1945
1946         if (ifp->prefix_len >= 127) /* RFC 6164 */
1947                 return;
1948         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1949         if (ipv6_addr_any(&addr))
1950                 return;
1951         __ipv6_dev_ac_dec(ifp->idev, &addr);
1952 }
1953
1954 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1955 {
1956         if (dev->addr_len != IEEE802154_ADDR_LEN)
1957                 return -1;
1958         memcpy(eui, dev->dev_addr, 8);
1959         eui[0] ^= 2;
1960         return 0;
1961 }
1962
1963 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1964 {
1965         union fwnet_hwaddr *ha;
1966
1967         if (dev->addr_len != FWNET_ALEN)
1968                 return -1;
1969
1970         ha = (union fwnet_hwaddr *)dev->dev_addr;
1971
1972         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1973         eui[0] ^= 2;
1974         return 0;
1975 }
1976
1977 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1978 {
1979         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1980         if (dev->addr_len != ARCNET_ALEN)
1981                 return -1;
1982         memset(eui, 0, 7);
1983         eui[7] = *(u8 *)dev->dev_addr;
1984         return 0;
1985 }
1986
1987 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1988 {
1989         if (dev->addr_len != INFINIBAND_ALEN)
1990                 return -1;
1991         memcpy(eui, dev->dev_addr + 12, 8);
1992         eui[0] |= 2;
1993         return 0;
1994 }
1995
1996 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1997 {
1998         if (addr == 0)
1999                 return -1;
2000         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2001                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2002                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2003                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2004                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2005                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2006         eui[1] = 0;
2007         eui[2] = 0x5E;
2008         eui[3] = 0xFE;
2009         memcpy(eui + 4, &addr, 4);
2010         return 0;
2011 }
2012
2013 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2014 {
2015         if (dev->priv_flags & IFF_ISATAP)
2016                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2017         return -1;
2018 }
2019
2020 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2021 {
2022         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2023 }
2024
2025 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2026 {
2027         memcpy(eui, dev->perm_addr, 3);
2028         memcpy(eui + 5, dev->perm_addr + 3, 3);
2029         eui[3] = 0xFF;
2030         eui[4] = 0xFE;
2031         eui[0] ^= 2;
2032         return 0;
2033 }
2034
2035 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2036 {
2037         switch (dev->type) {
2038         case ARPHRD_ETHER:
2039         case ARPHRD_FDDI:
2040                 return addrconf_ifid_eui48(eui, dev);
2041         case ARPHRD_ARCNET:
2042                 return addrconf_ifid_arcnet(eui, dev);
2043         case ARPHRD_INFINIBAND:
2044                 return addrconf_ifid_infiniband(eui, dev);
2045         case ARPHRD_SIT:
2046                 return addrconf_ifid_sit(eui, dev);
2047         case ARPHRD_IPGRE:
2048                 return addrconf_ifid_gre(eui, dev);
2049         case ARPHRD_6LOWPAN:
2050         case ARPHRD_IEEE802154:
2051                 return addrconf_ifid_eui64(eui, dev);
2052         case ARPHRD_IEEE1394:
2053                 return addrconf_ifid_ieee1394(eui, dev);
2054         case ARPHRD_TUNNEL6:
2055                 return addrconf_ifid_ip6tnl(eui, dev);
2056         }
2057         return -1;
2058 }
2059
2060 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2061 {
2062         int err = -1;
2063         struct inet6_ifaddr *ifp;
2064
2065         read_lock_bh(&idev->lock);
2066         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2067                 if (ifp->scope > IFA_LINK)
2068                         break;
2069                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2070                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2071                         err = 0;
2072                         break;
2073                 }
2074         }
2075         read_unlock_bh(&idev->lock);
2076         return err;
2077 }
2078
2079 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2080 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2081 {
2082 regen:
2083         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2084         idev->rndid[0] &= ~0x02;
2085
2086         /*
2087          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2088          * check if generated address is not inappropriate
2089          *
2090          *  - Reserved subnet anycast (RFC 2526)
2091          *      11111101 11....11 1xxxxxxx
2092          *  - ISATAP (RFC4214) 6.1
2093          *      00-00-5E-FE-xx-xx-xx-xx
2094          *  - value 0
2095          *  - XXX: already assigned to an address on the device
2096          */
2097         if (idev->rndid[0] == 0xfd &&
2098             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2099             (idev->rndid[7]&0x80))
2100                 goto regen;
2101         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2102                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2103                         goto regen;
2104                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2105                         goto regen;
2106         }
2107 }
2108
2109 static void ipv6_regen_rndid(unsigned long data)
2110 {
2111         struct inet6_dev *idev = (struct inet6_dev *) data;
2112         unsigned long expires;
2113
2114         rcu_read_lock_bh();
2115         write_lock_bh(&idev->lock);
2116
2117         if (idev->dead)
2118                 goto out;
2119
2120         __ipv6_regen_rndid(idev);
2121
2122         expires = jiffies +
2123                 idev->cnf.temp_prefered_lft * HZ -
2124                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2125                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2126                 idev->cnf.max_desync_factor * HZ;
2127         if (time_before(expires, jiffies)) {
2128                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2129                         __func__, idev->dev->name);
2130                 goto out;
2131         }
2132
2133         if (!mod_timer(&idev->regen_timer, expires))
2134                 in6_dev_hold(idev);
2135
2136 out:
2137         write_unlock_bh(&idev->lock);
2138         rcu_read_unlock_bh();
2139         in6_dev_put(idev);
2140 }
2141
2142 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2143 {
2144         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2145                 __ipv6_regen_rndid(idev);
2146 }
2147
2148 /*
2149  *      Add prefix route.
2150  */
2151
2152 static void
2153 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2154                       unsigned long expires, u32 flags)
2155 {
2156         struct fib6_config cfg = {
2157                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2158                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2159                 .fc_ifindex = dev->ifindex,
2160                 .fc_expires = expires,
2161                 .fc_dst_len = plen,
2162                 .fc_flags = RTF_UP | flags,
2163                 .fc_nlinfo.nl_net = dev_net(dev),
2164                 .fc_protocol = RTPROT_KERNEL,
2165         };
2166
2167         cfg.fc_dst = *pfx;
2168
2169         /* Prevent useless cloning on PtP SIT.
2170            This thing is done here expecting that the whole
2171            class of non-broadcast devices need not cloning.
2172          */
2173 #if IS_ENABLED(CONFIG_IPV6_SIT)
2174         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2175                 cfg.fc_flags |= RTF_NONEXTHOP;
2176 #endif
2177
2178         ip6_route_add(&cfg);
2179 }
2180
2181
2182 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2183                                                   int plen,
2184                                                   const struct net_device *dev,
2185                                                   u32 flags, u32 noflags)
2186 {
2187         struct fib6_node *fn;
2188         struct rt6_info *rt = NULL;
2189         struct fib6_table *table;
2190         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2191
2192         table = fib6_get_table(dev_net(dev), tb_id);
2193         if (!table)
2194                 return NULL;
2195
2196         read_lock_bh(&table->tb6_lock);
2197         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2198         if (!fn)
2199                 goto out;
2200
2201         noflags |= RTF_CACHE;
2202         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2203                 if (rt->dst.dev->ifindex != dev->ifindex)
2204                         continue;
2205                 if ((rt->rt6i_flags & flags) != flags)
2206                         continue;
2207                 if ((rt->rt6i_flags & noflags) != 0)
2208                         continue;
2209                 dst_hold(&rt->dst);
2210                 break;
2211         }
2212 out:
2213         read_unlock_bh(&table->tb6_lock);
2214         return rt;
2215 }
2216
2217
2218 /* Create "default" multicast route to the interface */
2219
2220 static void addrconf_add_mroute(struct net_device *dev)
2221 {
2222         struct fib6_config cfg = {
2223                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2224                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2225                 .fc_ifindex = dev->ifindex,
2226                 .fc_dst_len = 8,
2227                 .fc_flags = RTF_UP,
2228                 .fc_nlinfo.nl_net = dev_net(dev),
2229         };
2230
2231         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2232
2233         ip6_route_add(&cfg);
2234 }
2235
2236 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2237 {
2238         struct inet6_dev *idev;
2239
2240         ASSERT_RTNL();
2241
2242         idev = ipv6_find_idev(dev);
2243         if (!idev)
2244                 return ERR_PTR(-ENOBUFS);
2245
2246         if (idev->cnf.disable_ipv6)
2247                 return ERR_PTR(-EACCES);
2248
2249         /* Add default multicast route */
2250         if (!(dev->flags & IFF_LOOPBACK))
2251                 addrconf_add_mroute(dev);
2252
2253         return idev;
2254 }
2255
2256 static void manage_tempaddrs(struct inet6_dev *idev,
2257                              struct inet6_ifaddr *ifp,
2258                              __u32 valid_lft, __u32 prefered_lft,
2259                              bool create, unsigned long now)
2260 {
2261         u32 flags;
2262         struct inet6_ifaddr *ift;
2263
2264         read_lock_bh(&idev->lock);
2265         /* update all temporary addresses in the list */
2266         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2267                 int age, max_valid, max_prefered;
2268
2269                 if (ifp != ift->ifpub)
2270                         continue;
2271
2272                 /* RFC 4941 section 3.3:
2273                  * If a received option will extend the lifetime of a public
2274                  * address, the lifetimes of temporary addresses should
2275                  * be extended, subject to the overall constraint that no
2276                  * temporary addresses should ever remain "valid" or "preferred"
2277                  * for a time longer than (TEMP_VALID_LIFETIME) or
2278                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2279                  */
2280                 age = (now - ift->cstamp) / HZ;
2281                 max_valid = idev->cnf.temp_valid_lft - age;
2282                 if (max_valid < 0)
2283                         max_valid = 0;
2284
2285                 max_prefered = idev->cnf.temp_prefered_lft -
2286                                idev->cnf.max_desync_factor - age;
2287                 if (max_prefered < 0)
2288                         max_prefered = 0;
2289
2290                 if (valid_lft > max_valid)
2291                         valid_lft = max_valid;
2292
2293                 if (prefered_lft > max_prefered)
2294                         prefered_lft = max_prefered;
2295
2296                 spin_lock(&ift->lock);
2297                 flags = ift->flags;
2298                 ift->valid_lft = valid_lft;
2299                 ift->prefered_lft = prefered_lft;
2300                 ift->tstamp = now;
2301                 if (prefered_lft > 0)
2302                         ift->flags &= ~IFA_F_DEPRECATED;
2303
2304                 spin_unlock(&ift->lock);
2305                 if (!(flags&IFA_F_TENTATIVE))
2306                         ipv6_ifa_notify(0, ift);
2307         }
2308
2309         if ((create || list_empty(&idev->tempaddr_list)) &&
2310             idev->cnf.use_tempaddr > 0) {
2311                 /* When a new public address is created as described
2312                  * in [ADDRCONF], also create a new temporary address.
2313                  * Also create a temporary address if it's enabled but
2314                  * no temporary address currently exists.
2315                  */
2316                 read_unlock_bh(&idev->lock);
2317                 ipv6_create_tempaddr(ifp, NULL);
2318         } else {
2319                 read_unlock_bh(&idev->lock);
2320         }
2321 }
2322
2323 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2324 {
2325         struct prefix_info *pinfo;
2326         __u32 valid_lft;
2327         __u32 prefered_lft;
2328         int addr_type;
2329         u32 addr_flags = 0;
2330         struct inet6_dev *in6_dev;
2331         struct net *net = dev_net(dev);
2332
2333         pinfo = (struct prefix_info *) opt;
2334
2335         if (len < sizeof(struct prefix_info)) {
2336                 ADBG("addrconf: prefix option too short\n");
2337                 return;
2338         }
2339
2340         /*
2341          *      Validation checks ([ADDRCONF], page 19)
2342          */
2343
2344         addr_type = ipv6_addr_type(&pinfo->prefix);
2345
2346         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2347                 return;
2348
2349         valid_lft = ntohl(pinfo->valid);
2350         prefered_lft = ntohl(pinfo->prefered);
2351
2352         if (prefered_lft > valid_lft) {
2353                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2354                 return;
2355         }
2356
2357         in6_dev = in6_dev_get(dev);
2358
2359         if (!in6_dev) {
2360                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2361                                     dev->name);
2362                 return;
2363         }
2364
2365         /*
2366          *      Two things going on here:
2367          *      1) Add routes for on-link prefixes
2368          *      2) Configure prefixes with the auto flag set
2369          */
2370
2371         if (pinfo->onlink) {
2372                 struct rt6_info *rt;
2373                 unsigned long rt_expires;
2374
2375                 /* Avoid arithmetic overflow. Really, we could
2376                  * save rt_expires in seconds, likely valid_lft,
2377                  * but it would require division in fib gc, that it
2378                  * not good.
2379                  */
2380                 if (HZ > USER_HZ)
2381                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2382                 else
2383                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2384
2385                 if (addrconf_finite_timeout(rt_expires))
2386                         rt_expires *= HZ;
2387
2388                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2389                                                pinfo->prefix_len,
2390                                                dev,
2391                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2392                                                RTF_GATEWAY | RTF_DEFAULT);
2393
2394                 if (rt) {
2395                         /* Autoconf prefix route */
2396                         if (valid_lft == 0) {
2397                                 ip6_del_rt(rt);
2398                                 rt = NULL;
2399                         } else if (addrconf_finite_timeout(rt_expires)) {
2400                                 /* not infinity */
2401                                 rt6_set_expires(rt, jiffies + rt_expires);
2402                         } else {
2403                                 rt6_clean_expires(rt);
2404                         }
2405                 } else if (valid_lft) {
2406                         clock_t expires = 0;
2407                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2408                         if (addrconf_finite_timeout(rt_expires)) {
2409                                 /* not infinity */
2410                                 flags |= RTF_EXPIRES;
2411                                 expires = jiffies_to_clock_t(rt_expires);
2412                         }
2413                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2414                                               dev, expires, flags);
2415                 }
2416                 ip6_rt_put(rt);
2417         }
2418
2419         /* Try to figure out our local address for this prefix */
2420
2421         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2422                 struct inet6_ifaddr *ifp;
2423                 struct in6_addr addr;
2424                 int create = 0, update_lft = 0;
2425                 bool tokenized = false;
2426
2427                 if (pinfo->prefix_len == 64) {
2428                         memcpy(&addr, &pinfo->prefix, 8);
2429
2430                         if (!ipv6_addr_any(&in6_dev->token)) {
2431                                 read_lock_bh(&in6_dev->lock);
2432                                 memcpy(addr.s6_addr + 8,
2433                                        in6_dev->token.s6_addr + 8, 8);
2434                                 read_unlock_bh(&in6_dev->lock);
2435                                 tokenized = true;
2436                         } else if (in6_dev->addr_gen_mode ==
2437                                    IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2438                                    !ipv6_generate_stable_address(&addr, 0,
2439                                                                  in6_dev)) {
2440                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2441                                 goto ok;
2442                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2443                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2444                                 in6_dev_put(in6_dev);
2445                                 return;
2446                         }
2447                         goto ok;
2448                 }
2449                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2450                                     pinfo->prefix_len);
2451                 in6_dev_put(in6_dev);
2452                 return;
2453
2454 ok:
2455
2456                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2457
2458                 if (!ifp && valid_lft) {
2459                         int max_addresses = in6_dev->cnf.max_addresses;
2460
2461 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2462                         if (in6_dev->cnf.optimistic_dad &&
2463                             !net->ipv6.devconf_all->forwarding && sllao)
2464                                 addr_flags |= IFA_F_OPTIMISTIC;
2465 #endif
2466
2467                         /* Do not allow to create too much of autoconfigured
2468                          * addresses; this would be too easy way to crash kernel.
2469                          */
2470                         if (!max_addresses ||
2471                             ipv6_count_addresses(in6_dev) < max_addresses)
2472                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2473                                                     pinfo->prefix_len,
2474                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2475                                                     addr_flags, valid_lft,
2476                                                     prefered_lft);
2477
2478                         if (IS_ERR_OR_NULL(ifp)) {
2479                                 in6_dev_put(in6_dev);
2480                                 return;
2481                         }
2482
2483                         update_lft = 0;
2484                         create = 1;
2485                         spin_lock_bh(&ifp->lock);
2486                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2487                         ifp->cstamp = jiffies;
2488                         ifp->tokenized = tokenized;
2489                         spin_unlock_bh(&ifp->lock);
2490                         addrconf_dad_start(ifp);
2491                 }
2492
2493                 if (ifp) {
2494                         u32 flags;
2495                         unsigned long now;
2496                         u32 stored_lft;
2497
2498                         /* update lifetime (RFC2462 5.5.3 e) */
2499                         spin_lock_bh(&ifp->lock);
2500                         now = jiffies;
2501                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2502                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2503                         else
2504                                 stored_lft = 0;
2505                         if (!update_lft && !create && stored_lft) {
2506                                 const u32 minimum_lft = min_t(u32,
2507                                         stored_lft, MIN_VALID_LIFETIME);
2508                                 valid_lft = max(valid_lft, minimum_lft);
2509
2510                                 /* RFC4862 Section 5.5.3e:
2511                                  * "Note that the preferred lifetime of the
2512                                  *  corresponding address is always reset to
2513                                  *  the Preferred Lifetime in the received
2514                                  *  Prefix Information option, regardless of
2515                                  *  whether the valid lifetime is also reset or
2516                                  *  ignored."
2517                                  *
2518                                  * So we should always update prefered_lft here.
2519                                  */
2520                                 update_lft = 1;
2521                         }
2522
2523                         if (update_lft) {
2524                                 ifp->valid_lft = valid_lft;
2525                                 ifp->prefered_lft = prefered_lft;
2526                                 ifp->tstamp = now;
2527                                 flags = ifp->flags;
2528                                 ifp->flags &= ~IFA_F_DEPRECATED;
2529                                 spin_unlock_bh(&ifp->lock);
2530
2531                                 if (!(flags&IFA_F_TENTATIVE))
2532                                         ipv6_ifa_notify(0, ifp);
2533                         } else
2534                                 spin_unlock_bh(&ifp->lock);
2535
2536                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2537                                          create, now);
2538
2539                         in6_ifa_put(ifp);
2540                         addrconf_verify();
2541                 }
2542         }
2543         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2544         in6_dev_put(in6_dev);
2545 }
2546
2547 /*
2548  *      Set destination address.
2549  *      Special case for SIT interfaces where we create a new "virtual"
2550  *      device.
2551  */
2552 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2553 {
2554         struct in6_ifreq ireq;
2555         struct net_device *dev;
2556         int err = -EINVAL;
2557
2558         rtnl_lock();
2559
2560         err = -EFAULT;
2561         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2562                 goto err_exit;
2563
2564         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2565
2566         err = -ENODEV;
2567         if (!dev)
2568                 goto err_exit;
2569
2570 #if IS_ENABLED(CONFIG_IPV6_SIT)
2571         if (dev->type == ARPHRD_SIT) {
2572                 const struct net_device_ops *ops = dev->netdev_ops;
2573                 struct ifreq ifr;
2574                 struct ip_tunnel_parm p;
2575
2576                 err = -EADDRNOTAVAIL;
2577                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2578                         goto err_exit;
2579
2580                 memset(&p, 0, sizeof(p));
2581                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2582                 p.iph.saddr = 0;
2583                 p.iph.version = 4;
2584                 p.iph.ihl = 5;
2585                 p.iph.protocol = IPPROTO_IPV6;
2586                 p.iph.ttl = 64;
2587                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2588
2589                 if (ops->ndo_do_ioctl) {
2590                         mm_segment_t oldfs = get_fs();
2591
2592                         set_fs(KERNEL_DS);
2593                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2594                         set_fs(oldfs);
2595                 } else
2596                         err = -EOPNOTSUPP;
2597
2598                 if (err == 0) {
2599                         err = -ENOBUFS;
2600                         dev = __dev_get_by_name(net, p.name);
2601                         if (!dev)
2602                                 goto err_exit;
2603                         err = dev_open(dev);
2604                 }
2605         }
2606 #endif
2607
2608 err_exit:
2609         rtnl_unlock();
2610         return err;
2611 }
2612
2613 static int ipv6_mc_config(struct sock *sk, bool join,
2614                           const struct in6_addr *addr, int ifindex)
2615 {
2616         int ret;
2617
2618         ASSERT_RTNL();
2619
2620         lock_sock(sk);
2621         if (join)
2622                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2623         else
2624                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2625         release_sock(sk);
2626
2627         return ret;
2628 }
2629
2630 /*
2631  *      Manual configuration of address on an interface
2632  */
2633 static int inet6_addr_add(struct net *net, int ifindex,
2634                           const struct in6_addr *pfx,
2635                           const struct in6_addr *peer_pfx,
2636                           unsigned int plen, __u32 ifa_flags,
2637                           __u32 prefered_lft, __u32 valid_lft)
2638 {
2639         struct inet6_ifaddr *ifp;
2640         struct inet6_dev *idev;
2641         struct net_device *dev;
2642         unsigned long timeout;
2643         clock_t expires;
2644         int scope;
2645         u32 flags;
2646
2647         ASSERT_RTNL();
2648
2649         if (plen > 128)
2650                 return -EINVAL;
2651
2652         /* check the lifetime */
2653         if (!valid_lft || prefered_lft > valid_lft)
2654                 return -EINVAL;
2655
2656         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2657                 return -EINVAL;
2658
2659         dev = __dev_get_by_index(net, ifindex);
2660         if (!dev)
2661                 return -ENODEV;
2662
2663         idev = addrconf_add_dev(dev);
2664         if (IS_ERR(idev))
2665                 return PTR_ERR(idev);
2666
2667         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2668                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2669                                          true, pfx, ifindex);
2670
2671                 if (ret < 0)
2672                         return ret;
2673         }
2674
2675         scope = ipv6_addr_scope(pfx);
2676
2677         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2678         if (addrconf_finite_timeout(timeout)) {
2679                 expires = jiffies_to_clock_t(timeout * HZ);
2680                 valid_lft = timeout;
2681                 flags = RTF_EXPIRES;
2682         } else {
2683                 expires = 0;
2684                 flags = 0;
2685                 ifa_flags |= IFA_F_PERMANENT;
2686         }
2687
2688         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2689         if (addrconf_finite_timeout(timeout)) {
2690                 if (timeout == 0)
2691                         ifa_flags |= IFA_F_DEPRECATED;
2692                 prefered_lft = timeout;
2693         }
2694
2695         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2696                             valid_lft, prefered_lft);
2697
2698         if (!IS_ERR(ifp)) {
2699                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2700                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2701                                               expires, flags);
2702                 }
2703
2704                 /*
2705                  * Note that section 3.1 of RFC 4429 indicates
2706                  * that the Optimistic flag should not be set for
2707                  * manually configured addresses
2708                  */
2709                 addrconf_dad_start(ifp);
2710                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2711                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2712                                          true, jiffies);
2713                 in6_ifa_put(ifp);
2714                 addrconf_verify_rtnl();
2715                 return 0;
2716         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2717                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2718                                false, pfx, ifindex);
2719         }
2720
2721         return PTR_ERR(ifp);
2722 }
2723
2724 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2725                           const struct in6_addr *pfx, unsigned int plen)
2726 {
2727         struct inet6_ifaddr *ifp;
2728         struct inet6_dev *idev;
2729         struct net_device *dev;
2730
2731         if (plen > 128)
2732                 return -EINVAL;
2733
2734         dev = __dev_get_by_index(net, ifindex);
2735         if (!dev)
2736                 return -ENODEV;
2737
2738         idev = __in6_dev_get(dev);
2739         if (!idev)
2740                 return -ENXIO;
2741
2742         read_lock_bh(&idev->lock);
2743         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2744                 if (ifp->prefix_len == plen &&
2745                     ipv6_addr_equal(pfx, &ifp->addr)) {
2746                         in6_ifa_hold(ifp);
2747                         read_unlock_bh(&idev->lock);
2748
2749                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2750                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2751                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2752                                                  jiffies);
2753                         ipv6_del_addr(ifp);
2754                         addrconf_verify_rtnl();
2755                         if (ipv6_addr_is_multicast(pfx)) {
2756                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2757                                                false, pfx, dev->ifindex);
2758                         }
2759                         return 0;
2760                 }
2761         }
2762         read_unlock_bh(&idev->lock);
2763         return -EADDRNOTAVAIL;
2764 }
2765
2766
2767 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2768 {
2769         struct in6_ifreq ireq;
2770         int err;
2771
2772         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2773                 return -EPERM;
2774
2775         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2776                 return -EFAULT;
2777
2778         rtnl_lock();
2779         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2780                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2781                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2782         rtnl_unlock();
2783         return err;
2784 }
2785
2786 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2787 {
2788         struct in6_ifreq ireq;
2789         int err;
2790
2791         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2792                 return -EPERM;
2793
2794         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2795                 return -EFAULT;
2796
2797         rtnl_lock();
2798         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2799                              ireq.ifr6_prefixlen);
2800         rtnl_unlock();
2801         return err;
2802 }
2803
2804 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2805                      int plen, int scope)
2806 {
2807         struct inet6_ifaddr *ifp;
2808
2809         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2810                             scope, IFA_F_PERMANENT,
2811                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2812         if (!IS_ERR(ifp)) {
2813                 spin_lock_bh(&ifp->lock);
2814                 ifp->flags &= ~IFA_F_TENTATIVE;
2815                 spin_unlock_bh(&ifp->lock);
2816                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2817                 in6_ifa_put(ifp);
2818         }
2819 }
2820
2821 #if IS_ENABLED(CONFIG_IPV6_SIT)
2822 static void sit_add_v4_addrs(struct inet6_dev *idev)
2823 {
2824         struct in6_addr addr;
2825         struct net_device *dev;
2826         struct net *net = dev_net(idev->dev);
2827         int scope, plen;
2828         u32 pflags = 0;
2829
2830         ASSERT_RTNL();
2831
2832         memset(&addr, 0, sizeof(struct in6_addr));
2833         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2834
2835         if (idev->dev->flags&IFF_POINTOPOINT) {
2836                 addr.s6_addr32[0] = htonl(0xfe800000);
2837                 scope = IFA_LINK;
2838                 plen = 64;
2839         } else {
2840                 scope = IPV6_ADDR_COMPATv4;
2841                 plen = 96;
2842                 pflags |= RTF_NONEXTHOP;
2843         }
2844
2845         if (addr.s6_addr32[3]) {
2846                 add_addr(idev, &addr, plen, scope);
2847                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2848                 return;
2849         }
2850
2851         for_each_netdev(net, dev) {
2852                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2853                 if (in_dev && (dev->flags & IFF_UP)) {
2854                         struct in_ifaddr *ifa;
2855
2856                         int flag = scope;
2857
2858                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2859
2860                                 addr.s6_addr32[3] = ifa->ifa_local;
2861
2862                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2863                                         continue;
2864                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2865                                         if (idev->dev->flags&IFF_POINTOPOINT)
2866                                                 continue;
2867                                         flag |= IFA_HOST;
2868                                 }
2869
2870                                 add_addr(idev, &addr, plen, flag);
2871                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2872                                                       pflags);
2873                         }
2874                 }
2875         }
2876 }
2877 #endif
2878
2879 static void init_loopback(struct net_device *dev)
2880 {
2881         struct inet6_dev  *idev;
2882         struct net_device *sp_dev;
2883         struct inet6_ifaddr *sp_ifa;
2884         struct rt6_info *sp_rt;
2885
2886         /* ::1 */
2887
2888         ASSERT_RTNL();
2889
2890         idev = ipv6_find_idev(dev);
2891         if (!idev) {
2892                 pr_debug("%s: add_dev failed\n", __func__);
2893                 return;
2894         }
2895
2896         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2897
2898         /* Add routes to other interface's IPv6 addresses */
2899         for_each_netdev(dev_net(dev), sp_dev) {
2900                 if (!strcmp(sp_dev->name, dev->name))
2901                         continue;
2902
2903                 idev = __in6_dev_get(sp_dev);
2904                 if (!idev)
2905                         continue;
2906
2907                 read_lock_bh(&idev->lock);
2908                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2909
2910                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2911                                 continue;
2912
2913                         if (sp_ifa->rt) {
2914                                 /* This dst has been added to garbage list when
2915                                  * lo device down, release this obsolete dst and
2916                                  * reallocate a new router for ifa.
2917                                  */
2918                                 if (sp_ifa->rt->dst.obsolete > 0) {
2919                                         ip6_rt_put(sp_ifa->rt);
2920                                         sp_ifa->rt = NULL;
2921                                 } else {
2922                                         continue;
2923                                 }
2924                         }
2925
2926                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2927
2928                         /* Failure cases are ignored */
2929                         if (!IS_ERR(sp_rt)) {
2930                                 sp_ifa->rt = sp_rt;
2931                                 ip6_ins_rt(sp_rt);
2932                         }
2933                 }
2934                 read_unlock_bh(&idev->lock);
2935         }
2936 }
2937
2938 static void addrconf_add_linklocal(struct inet6_dev *idev,
2939                                    const struct in6_addr *addr, u32 flags)
2940 {
2941         struct inet6_ifaddr *ifp;
2942         u32 addr_flags = flags | IFA_F_PERMANENT;
2943
2944 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2945         if (idev->cnf.optimistic_dad &&
2946             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2947                 addr_flags |= IFA_F_OPTIMISTIC;
2948 #endif
2949
2950         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2951                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2952         if (!IS_ERR(ifp)) {
2953                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2954                 addrconf_dad_start(ifp);
2955                 in6_ifa_put(ifp);
2956         }
2957 }
2958
2959 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2960 {
2961         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2962                 return true;
2963
2964         if (address.s6_addr32[2] == htonl(0x02005eff) &&
2965             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2966                 return true;
2967
2968         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2969             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2970                 return true;
2971
2972         return false;
2973 }
2974
2975 static int ipv6_generate_stable_address(struct in6_addr *address,
2976                                         u8 dad_count,
2977                                         const struct inet6_dev *idev)
2978 {
2979         static DEFINE_SPINLOCK(lock);
2980         static __u32 digest[SHA_DIGEST_WORDS];
2981         static __u32 workspace[SHA_WORKSPACE_WORDS];
2982
2983         static union {
2984                 char __data[SHA_MESSAGE_BYTES];
2985                 struct {
2986                         struct in6_addr secret;
2987                         __be32 prefix[2];
2988                         unsigned char hwaddr[MAX_ADDR_LEN];
2989                         u8 dad_count;
2990                 } __packed;
2991         } data;
2992
2993         struct in6_addr secret;
2994         struct in6_addr temp;
2995         struct net *net = dev_net(idev->dev);
2996
2997         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2998
2999         if (idev->cnf.stable_secret.initialized)
3000                 secret = idev->cnf.stable_secret.secret;
3001         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3002                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3003         else
3004                 return -1;
3005
3006 retry:
3007         spin_lock_bh(&lock);
3008
3009         sha_init(digest);
3010         memset(&data, 0, sizeof(data));
3011         memset(workspace, 0, sizeof(workspace));
3012         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3013         data.prefix[0] = address->s6_addr32[0];
3014         data.prefix[1] = address->s6_addr32[1];
3015         data.secret = secret;
3016         data.dad_count = dad_count;
3017
3018         sha_transform(digest, data.__data, workspace);
3019
3020         temp = *address;
3021         temp.s6_addr32[2] = (__force __be32)digest[0];
3022         temp.s6_addr32[3] = (__force __be32)digest[1];
3023
3024         spin_unlock_bh(&lock);
3025
3026         if (ipv6_reserved_interfaceid(temp)) {
3027                 dad_count++;
3028                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3029                         return -1;
3030                 goto retry;
3031         }
3032
3033         *address = temp;
3034         return 0;
3035 }
3036
3037 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3038 {
3039         struct in6_addr addr;
3040
3041         /* no link local addresses on L3 master devices */
3042         if (netif_is_l3_master(idev->dev))
3043                 return;
3044
3045         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3046
3047         if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3048                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3049                         addrconf_add_linklocal(idev, &addr,
3050                                                IFA_F_STABLE_PRIVACY);
3051                 else if (prefix_route)
3052                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3053         } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3054                 /* addrconf_add_linklocal also adds a prefix_route and we
3055                  * only need to care about prefix routes if ipv6_generate_eui64
3056                  * couldn't generate one.
3057                  */
3058                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3059                         addrconf_add_linklocal(idev, &addr, 0);
3060                 else if (prefix_route)
3061                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3062         }
3063 }
3064
3065 static void addrconf_dev_config(struct net_device *dev)
3066 {
3067         struct inet6_dev *idev;
3068
3069         ASSERT_RTNL();
3070
3071         if ((dev->type != ARPHRD_ETHER) &&
3072             (dev->type != ARPHRD_FDDI) &&
3073             (dev->type != ARPHRD_ARCNET) &&
3074             (dev->type != ARPHRD_INFINIBAND) &&
3075             (dev->type != ARPHRD_IEEE802154) &&
3076             (dev->type != ARPHRD_IEEE1394) &&
3077             (dev->type != ARPHRD_TUNNEL6) &&
3078             (dev->type != ARPHRD_6LOWPAN)) {
3079                 /* Alas, we support only Ethernet autoconfiguration. */
3080                 return;
3081         }
3082
3083         idev = addrconf_add_dev(dev);
3084         if (IS_ERR(idev))
3085                 return;
3086
3087         addrconf_addr_gen(idev, false);
3088 }
3089
3090 #if IS_ENABLED(CONFIG_IPV6_SIT)
3091 static void addrconf_sit_config(struct net_device *dev)
3092 {
3093         struct inet6_dev *idev;
3094
3095         ASSERT_RTNL();
3096
3097         /*
3098          * Configure the tunnel with one of our IPv4
3099          * addresses... we should configure all of
3100          * our v4 addrs in the tunnel
3101          */
3102
3103         idev = ipv6_find_idev(dev);
3104         if (!idev) {
3105                 pr_debug("%s: add_dev failed\n", __func__);
3106                 return;
3107         }
3108
3109         if (dev->priv_flags & IFF_ISATAP) {
3110                 addrconf_addr_gen(idev, false);
3111                 return;
3112         }
3113
3114         sit_add_v4_addrs(idev);
3115
3116         if (dev->flags&IFF_POINTOPOINT)
3117                 addrconf_add_mroute(dev);
3118 }
3119 #endif
3120
3121 #if IS_ENABLED(CONFIG_NET_IPGRE)
3122 static void addrconf_gre_config(struct net_device *dev)
3123 {
3124         struct inet6_dev *idev;
3125
3126         ASSERT_RTNL();
3127
3128         idev = ipv6_find_idev(dev);
3129         if (!idev) {
3130                 pr_debug("%s: add_dev failed\n", __func__);
3131                 return;
3132         }
3133
3134         addrconf_addr_gen(idev, true);
3135         if (dev->flags & IFF_POINTOPOINT)
3136                 addrconf_add_mroute(dev);
3137 }
3138 #endif
3139
3140 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3141                            void *ptr)
3142 {
3143         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3144         struct inet6_dev *idev = __in6_dev_get(dev);
3145         int run_pending = 0;
3146         int err;
3147
3148         switch (event) {
3149         case NETDEV_REGISTER:
3150                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3151                         idev = ipv6_add_dev(dev);
3152                         if (IS_ERR(idev))
3153                                 return notifier_from_errno(PTR_ERR(idev));
3154                 }
3155                 break;
3156
3157         case NETDEV_CHANGEMTU:
3158                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3159                 if (dev->mtu < IPV6_MIN_MTU) {
3160                         addrconf_ifdown(dev, 1);
3161                         break;
3162                 }
3163
3164                 if (idev) {
3165                         rt6_mtu_change(dev, dev->mtu);
3166                         idev->cnf.mtu6 = dev->mtu;
3167                         break;
3168                 }
3169
3170                 /* allocate new idev */
3171                 idev = ipv6_add_dev(dev);
3172                 if (IS_ERR(idev))
3173                         break;
3174
3175                 /* device is still not ready */
3176                 if (!(idev->if_flags & IF_READY))
3177                         break;
3178
3179                 run_pending = 1;
3180
3181                 /* fall through */
3182
3183         case NETDEV_UP:
3184         case NETDEV_CHANGE:
3185                 if (dev->flags & IFF_SLAVE)
3186                         break;
3187
3188                 if (idev && idev->cnf.disable_ipv6)
3189                         break;
3190
3191                 if (event == NETDEV_UP) {
3192                         if (!addrconf_qdisc_ok(dev)) {
3193                                 /* device is not ready yet. */
3194                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3195                                         dev->name);
3196                                 break;
3197                         }
3198
3199                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3200                                 idev = ipv6_add_dev(dev);
3201
3202                         if (!IS_ERR_OR_NULL(idev)) {
3203                                 idev->if_flags |= IF_READY;
3204                                 run_pending = 1;
3205                         }
3206                 } else if (event == NETDEV_CHANGE) {
3207                         if (!addrconf_qdisc_ok(dev)) {
3208                                 /* device is still not ready. */
3209                                 break;
3210                         }
3211
3212                         if (idev) {
3213                                 if (idev->if_flags & IF_READY)
3214                                         /* device is already configured. */
3215                                         break;
3216                                 idev->if_flags |= IF_READY;
3217                         }
3218
3219                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3220                                 dev->name);
3221
3222                         run_pending = 1;
3223                 }
3224
3225                 switch (dev->type) {
3226 #if IS_ENABLED(CONFIG_IPV6_SIT)
3227                 case ARPHRD_SIT:
3228                         addrconf_sit_config(dev);
3229                         break;
3230 #endif
3231 #if IS_ENABLED(CONFIG_NET_IPGRE)
3232                 case ARPHRD_IPGRE:
3233                         addrconf_gre_config(dev);
3234                         break;
3235 #endif
3236                 case ARPHRD_LOOPBACK:
3237                         init_loopback(dev);
3238                         break;
3239
3240                 default:
3241                         addrconf_dev_config(dev);
3242                         break;
3243                 }
3244
3245                 if (!IS_ERR_OR_NULL(idev)) {
3246                         if (run_pending)
3247                                 addrconf_dad_run(idev);
3248
3249                         /*
3250                          * If the MTU changed during the interface down,
3251                          * when the interface up, the changed MTU must be
3252                          * reflected in the idev as well as routers.
3253                          */
3254                         if (idev->cnf.mtu6 != dev->mtu &&
3255                             dev->mtu >= IPV6_MIN_MTU) {
3256                                 rt6_mtu_change(dev, dev->mtu);
3257                                 idev->cnf.mtu6 = dev->mtu;
3258                         }
3259                         idev->tstamp = jiffies;
3260                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3261
3262                         /*
3263                          * If the changed mtu during down is lower than
3264                          * IPV6_MIN_MTU stop IPv6 on this interface.
3265                          */
3266                         if (dev->mtu < IPV6_MIN_MTU)
3267                                 addrconf_ifdown(dev, 1);
3268                 }
3269                 break;
3270
3271         case NETDEV_DOWN:
3272         case NETDEV_UNREGISTER:
3273                 /*
3274                  *      Remove all addresses from this interface.
3275                  */
3276                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3277                 break;
3278
3279         case NETDEV_CHANGENAME:
3280                 if (idev) {
3281                         snmp6_unregister_dev(idev);
3282                         addrconf_sysctl_unregister(idev);
3283                         err = addrconf_sysctl_register(idev);
3284                         if (err)
3285                                 return notifier_from_errno(err);
3286                         err = snmp6_register_dev(idev);
3287                         if (err) {
3288                                 addrconf_sysctl_unregister(idev);
3289                                 return notifier_from_errno(err);
3290                         }
3291                 }
3292                 break;
3293
3294         case NETDEV_PRE_TYPE_CHANGE:
3295         case NETDEV_POST_TYPE_CHANGE:
3296                 addrconf_type_change(dev, event);
3297                 break;
3298         }
3299
3300         return NOTIFY_OK;
3301 }
3302
3303 /*
3304  *      addrconf module should be notified of a device going up
3305  */
3306 static struct notifier_block ipv6_dev_notf = {
3307         .notifier_call = addrconf_notify,
3308 };
3309
3310 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3311 {
3312         struct inet6_dev *idev;
3313         ASSERT_RTNL();
3314
3315         idev = __in6_dev_get(dev);
3316
3317         if (event == NETDEV_POST_TYPE_CHANGE)
3318                 ipv6_mc_remap(idev);
3319         else if (event == NETDEV_PRE_TYPE_CHANGE)
3320                 ipv6_mc_unmap(idev);
3321 }
3322
3323 static int addrconf_ifdown(struct net_device *dev, int how)
3324 {
3325         struct net *net = dev_net(dev);
3326         struct inet6_dev *idev;
3327         struct inet6_ifaddr *ifa;
3328         int state, i;
3329
3330         ASSERT_RTNL();
3331
3332         rt6_ifdown(net, dev);
3333         neigh_ifdown(&nd_tbl, dev);
3334
3335         idev = __in6_dev_get(dev);
3336         if (!idev)
3337                 return -ENODEV;
3338
3339         /*
3340          * Step 1: remove reference to ipv6 device from parent device.
3341          *         Do not dev_put!
3342          */
3343         if (how) {
3344                 idev->dead = 1;
3345
3346                 /* protected by rtnl_lock */
3347                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3348
3349                 /* Step 1.5: remove snmp6 entry */
3350                 snmp6_unregister_dev(idev);
3351
3352         }
3353
3354         /* Step 2: clear hash table */
3355         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3356                 struct hlist_head *h = &inet6_addr_lst[i];
3357
3358                 spin_lock_bh(&addrconf_hash_lock);
3359 restart:
3360                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3361                         if (ifa->idev == idev) {
3362                                 hlist_del_init_rcu(&ifa->addr_lst);
3363                                 addrconf_del_dad_work(ifa);
3364                                 goto restart;
3365                         }
3366                 }
3367                 spin_unlock_bh(&addrconf_hash_lock);
3368         }
3369
3370         write_lock_bh(&idev->lock);
3371
3372         addrconf_del_rs_timer(idev);
3373
3374         /* Step 2: clear flags for stateless addrconf */
3375         if (!how)
3376                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3377
3378         if (how && del_timer(&idev->regen_timer))
3379                 in6_dev_put(idev);
3380
3381         /* Step 3: clear tempaddr list */
3382         while (!list_empty(&idev->tempaddr_list)) {
3383                 ifa = list_first_entry(&idev->tempaddr_list,
3384                                        struct inet6_ifaddr, tmp_list);
3385                 list_del(&ifa->tmp_list);
3386                 write_unlock_bh(&idev->lock);
3387                 spin_lock_bh(&ifa->lock);
3388
3389                 if (ifa->ifpub) {
3390                         in6_ifa_put(ifa->ifpub);
3391                         ifa->ifpub = NULL;
3392                 }
3393                 spin_unlock_bh(&ifa->lock);
3394                 in6_ifa_put(ifa);
3395                 write_lock_bh(&idev->lock);
3396         }
3397
3398         while (!list_empty(&idev->addr_list)) {
3399                 ifa = list_first_entry(&idev->addr_list,
3400                                        struct inet6_ifaddr, if_list);
3401                 addrconf_del_dad_work(ifa);
3402
3403                 list_del(&ifa->if_list);
3404
3405                 write_unlock_bh(&idev->lock);
3406
3407                 spin_lock_bh(&ifa->lock);
3408                 state = ifa->state;
3409                 ifa->state = INET6_IFADDR_STATE_DEAD;
3410                 spin_unlock_bh(&ifa->lock);
3411
3412                 if (state != INET6_IFADDR_STATE_DEAD) {
3413                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3414                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3415                 }
3416                 in6_ifa_put(ifa);
3417
3418                 write_lock_bh(&idev->lock);
3419         }
3420
3421         write_unlock_bh(&idev->lock);
3422
3423         /* Step 5: Discard anycast and multicast list */
3424         if (how) {
3425                 ipv6_ac_destroy_dev(idev);
3426                 ipv6_mc_destroy_dev(idev);
3427         } else {
3428                 ipv6_mc_down(idev);
3429         }
3430
3431         idev->tstamp = jiffies;
3432
3433         /* Last: Shot the device (if unregistered) */
3434         if (how) {
3435                 addrconf_sysctl_unregister(idev);
3436                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3437                 neigh_ifdown(&nd_tbl, dev);
3438                 in6_dev_put(idev);
3439         }
3440         return 0;
3441 }
3442
3443 static void addrconf_rs_timer(unsigned long data)
3444 {
3445         struct inet6_dev *idev = (struct inet6_dev *)data;
3446         struct net_device *dev = idev->dev;
3447         struct in6_addr lladdr;
3448
3449         write_lock(&idev->lock);
3450         if (idev->dead || !(idev->if_flags & IF_READY))
3451                 goto out;
3452
3453         if (!ipv6_accept_ra(idev))
3454                 goto out;
3455
3456         /* Announcement received after solicitation was sent */
3457         if (idev->if_flags & IF_RA_RCVD)
3458                 goto out;
3459
3460         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3461                 write_unlock(&idev->lock);
3462                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3463                         ndisc_send_rs(dev, &lladdr,
3464                                       &in6addr_linklocal_allrouters);
3465                 else
3466                         goto put;
3467
3468                 write_lock(&idev->lock);
3469                 /* The wait after the last probe can be shorter */
3470                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3471                                              idev->cnf.rtr_solicits) ?
3472                                       idev->cnf.rtr_solicit_delay :
3473                                       idev->cnf.rtr_solicit_interval);
3474         } else {
3475                 /*
3476                  * Note: we do not support deprecated "all on-link"
3477                  * assumption any longer.
3478                  */
3479                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3480         }
3481
3482 out:
3483         write_unlock(&idev->lock);
3484 put:
3485         in6_dev_put(idev);
3486 }
3487
3488 /*
3489  *      Duplicate Address Detection
3490  */
3491 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3492 {
3493         unsigned long rand_num;
3494         struct inet6_dev *idev = ifp->idev;
3495
3496         if (ifp->flags & IFA_F_OPTIMISTIC)
3497                 rand_num = 0;
3498         else
3499                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3500
3501         ifp->dad_probes = idev->cnf.dad_transmits;
3502         addrconf_mod_dad_work(ifp, rand_num);
3503 }
3504
3505 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3506 {
3507         struct inet6_dev *idev = ifp->idev;
3508         struct net_device *dev = idev->dev;
3509
3510         addrconf_join_solict(dev, &ifp->addr);
3511
3512         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3513
3514         read_lock_bh(&idev->lock);
3515         spin_lock(&ifp->lock);
3516         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3517                 goto out;
3518
3519         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3520             idev->cnf.accept_dad < 1 ||
3521             !(ifp->flags&IFA_F_TENTATIVE) ||
3522             ifp->flags & IFA_F_NODAD) {
3523                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3524                 spin_unlock(&ifp->lock);
3525                 read_unlock_bh(&idev->lock);
3526
3527                 addrconf_dad_completed(ifp);
3528                 return;
3529         }
3530
3531         if (!(idev->if_flags & IF_READY)) {
3532                 spin_unlock(&ifp->lock);
3533                 read_unlock_bh(&idev->lock);
3534                 /*
3535                  * If the device is not ready:
3536                  * - keep it tentative if it is a permanent address.
3537                  * - otherwise, kill it.
3538                  */
3539                 in6_ifa_hold(ifp);
3540                 addrconf_dad_stop(ifp, 0);
3541                 return;
3542         }
3543
3544         /*
3545          * Optimistic nodes can start receiving
3546          * Frames right away
3547          */
3548         if (ifp->flags & IFA_F_OPTIMISTIC) {
3549                 ip6_ins_rt(ifp->rt);
3550                 if (ipv6_use_optimistic_addr(idev)) {
3551                         /* Because optimistic nodes can use this address,
3552                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3553                          */
3554                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3555                 }
3556         }
3557
3558         addrconf_dad_kick(ifp);
3559 out:
3560         spin_unlock(&ifp->lock);
3561         read_unlock_bh(&idev->lock);
3562 }
3563
3564 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3565 {
3566         bool begin_dad = false;
3567
3568         spin_lock_bh(&ifp->lock);
3569         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3570                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3571                 begin_dad = true;
3572         }
3573         spin_unlock_bh(&ifp->lock);
3574
3575         if (begin_dad)
3576                 addrconf_mod_dad_work(ifp, 0);
3577 }
3578
3579 static void addrconf_dad_work(struct work_struct *w)
3580 {
3581         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3582                                                 struct inet6_ifaddr,
3583                                                 dad_work);
3584         struct inet6_dev *idev = ifp->idev;
3585         struct in6_addr mcaddr;
3586
3587         enum {
3588                 DAD_PROCESS,
3589                 DAD_BEGIN,
3590                 DAD_ABORT,
3591         } action = DAD_PROCESS;
3592
3593         rtnl_lock();
3594
3595         spin_lock_bh(&ifp->lock);
3596         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3597                 action = DAD_BEGIN;
3598                 ifp->state = INET6_IFADDR_STATE_DAD;
3599         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3600                 action = DAD_ABORT;
3601                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3602         }
3603         spin_unlock_bh(&ifp->lock);
3604
3605         if (action == DAD_BEGIN) {
3606                 addrconf_dad_begin(ifp);
3607                 goto out;
3608         } else if (action == DAD_ABORT) {
3609                 addrconf_dad_stop(ifp, 1);
3610                 goto out;
3611         }
3612
3613         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3614                 goto out;
3615
3616         write_lock_bh(&idev->lock);
3617         if (idev->dead || !(idev->if_flags & IF_READY)) {
3618                 write_unlock_bh(&idev->lock);
3619                 goto out;
3620         }
3621
3622         spin_lock(&ifp->lock);
3623         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3624                 spin_unlock(&ifp->lock);
3625                 write_unlock_bh(&idev->lock);
3626                 goto out;
3627         }
3628
3629         if (ifp->dad_probes == 0) {
3630                 /*
3631                  * DAD was successful
3632                  */
3633
3634                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3635                 spin_unlock(&ifp->lock);
3636                 write_unlock_bh(&idev->lock);
3637
3638                 addrconf_dad_completed(ifp);
3639
3640                 goto out;
3641         }
3642
3643         ifp->dad_probes--;
3644         addrconf_mod_dad_work(ifp,
3645                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3646         spin_unlock(&ifp->lock);
3647         write_unlock_bh(&idev->lock);
3648
3649         /* send a neighbour solicitation for our addr */
3650         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3651         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3652 out:
3653         in6_ifa_put(ifp);
3654         rtnl_unlock();
3655 }
3656
3657 /* ifp->idev must be at least read locked */
3658 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3659 {
3660         struct inet6_ifaddr *ifpiter;
3661         struct inet6_dev *idev = ifp->idev;
3662
3663         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3664                 if (ifpiter->scope > IFA_LINK)
3665                         break;
3666                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3667                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3668                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3669                     IFA_F_PERMANENT)
3670                         return false;
3671         }
3672         return true;
3673 }
3674
3675 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3676 {
3677         struct net_device *dev = ifp->idev->dev;
3678         struct in6_addr lladdr;
3679         bool send_rs, send_mld;
3680
3681         addrconf_del_dad_work(ifp);
3682
3683         /*
3684          *      Configure the address for reception. Now it is valid.
3685          */
3686
3687         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3688
3689         /* If added prefix is link local and we are prepared to process
3690            router advertisements, start sending router solicitations.
3691          */
3692
3693         read_lock_bh(&ifp->idev->lock);
3694         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3695         send_rs = send_mld &&
3696                   ipv6_accept_ra(ifp->idev) &&
3697                   ifp->idev->cnf.rtr_solicits > 0 &&
3698                   (dev->flags&IFF_LOOPBACK) == 0;
3699         read_unlock_bh(&ifp->idev->lock);
3700
3701         /* While dad is in progress mld report's source address is in6_addrany.
3702          * Resend with proper ll now.
3703          */
3704         if (send_mld)
3705                 ipv6_mc_dad_complete(ifp->idev);
3706
3707         if (send_rs) {
3708                 /*
3709                  *      If a host as already performed a random delay
3710                  *      [...] as part of DAD [...] there is no need
3711                  *      to delay again before sending the first RS
3712                  */
3713                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3714                         return;
3715                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3716
3717                 write_lock_bh(&ifp->idev->lock);
3718                 spin_lock(&ifp->lock);
3719                 ifp->idev->rs_probes = 1;
3720                 ifp->idev->if_flags |= IF_RS_SENT;
3721                 addrconf_mod_rs_timer(ifp->idev,
3722                                       ifp->idev->cnf.rtr_solicit_interval);
3723                 spin_unlock(&ifp->lock);
3724                 write_unlock_bh(&ifp->idev->lock);
3725         }
3726 }
3727
3728 static void addrconf_dad_run(struct inet6_dev *idev)
3729 {
3730         struct inet6_ifaddr *ifp;
3731
3732         read_lock_bh(&idev->lock);
3733         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3734                 spin_lock(&ifp->lock);
3735                 if (ifp->flags & IFA_F_TENTATIVE &&
3736                     ifp->state == INET6_IFADDR_STATE_DAD)
3737                         addrconf_dad_kick(ifp);
3738                 spin_unlock(&ifp->lock);
3739         }
3740         read_unlock_bh(&idev->lock);
3741 }
3742
3743 #ifdef CONFIG_PROC_FS
3744 struct if6_iter_state {
3745         struct seq_net_private p;
3746         int bucket;
3747         int offset;
3748 };
3749
3750 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3751 {
3752         struct inet6_ifaddr *ifa = NULL;
3753         struct if6_iter_state *state = seq->private;
3754         struct net *net = seq_file_net(seq);
3755         int p = 0;
3756
3757         /* initial bucket if pos is 0 */
3758         if (pos == 0) {
3759                 state->bucket = 0;
3760                 state->offset = 0;
3761         }
3762
3763         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3764                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3765                                          addr_lst) {
3766                         if (!net_eq(dev_net(ifa->idev->dev), net))
3767                                 continue;
3768                         /* sync with offset */
3769                         if (p < state->offset) {
3770                                 p++;
3771                                 continue;
3772                         }
3773                         state->offset++;
3774                         return ifa;
3775                 }
3776
3777                 /* prepare for next bucket */
3778                 state->offset = 0;
3779                 p = 0;
3780         }
3781         return NULL;
3782 }
3783
3784 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3785                                          struct inet6_ifaddr *ifa)
3786 {
3787         struct if6_iter_state *state = seq->private;
3788         struct net *net = seq_file_net(seq);
3789
3790         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3791                 if (!net_eq(dev_net(ifa->idev->dev), net))
3792                         continue;
3793                 state->offset++;
3794                 return ifa;
3795         }
3796
3797         while (++state->bucket < IN6_ADDR_HSIZE) {
3798                 state->offset = 0;
3799                 hlist_for_each_entry_rcu_bh(ifa,
3800                                      &inet6_addr_lst[state->bucket], addr_lst) {
3801                         if (!net_eq(dev_net(ifa->idev->dev), net))
3802                                 continue;
3803                         state->offset++;
3804                         return ifa;
3805                 }
3806         }
3807
3808         return NULL;
3809 }
3810
3811 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3812         __acquires(rcu_bh)
3813 {
3814         rcu_read_lock_bh();
3815         return if6_get_first(seq, *pos);
3816 }
3817
3818 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3819 {
3820         struct inet6_ifaddr *ifa;
3821
3822         ifa = if6_get_next(seq, v);
3823         ++*pos;
3824         return ifa;
3825 }
3826
3827 static void if6_seq_stop(struct seq_file *seq, void *v)
3828         __releases(rcu_bh)
3829 {
3830         rcu_read_unlock_bh();
3831 }
3832
3833 static int if6_seq_show(struct seq_file *seq, void *v)
3834 {
3835         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3836         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3837                    &ifp->addr,
3838                    ifp->idev->dev->ifindex,
3839                    ifp->prefix_len,
3840                    ifp->scope,
3841                    (u8) ifp->flags,
3842                    ifp->idev->dev->name);
3843         return 0;
3844 }
3845
3846 static const struct seq_operations if6_seq_ops = {
3847         .start  = if6_seq_start,
3848         .next   = if6_seq_next,
3849         .show   = if6_seq_show,
3850         .stop   = if6_seq_stop,
3851 };
3852
3853 static int if6_seq_open(struct inode *inode, struct file *file)
3854 {
3855         return seq_open_net(inode, file, &if6_seq_ops,
3856                             sizeof(struct if6_iter_state));
3857 }
3858
3859 static const struct file_operations if6_fops = {
3860         .owner          = THIS_MODULE,
3861         .open           = if6_seq_open,
3862         .read           = seq_read,
3863         .llseek         = seq_lseek,
3864         .release        = seq_release_net,
3865 };
3866
3867 static int __net_init if6_proc_net_init(struct net *net)
3868 {
3869         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3870                 return -ENOMEM;
3871         return 0;
3872 }
3873
3874 static void __net_exit if6_proc_net_exit(struct net *net)
3875 {
3876         remove_proc_entry("if_inet6", net->proc_net);
3877 }
3878
3879 static struct pernet_operations if6_proc_net_ops = {
3880         .init = if6_proc_net_init,
3881         .exit = if6_proc_net_exit,
3882 };
3883
3884 int __init if6_proc_init(void)
3885 {
3886         return register_pernet_subsys(&if6_proc_net_ops);
3887 }
3888
3889 void if6_proc_exit(void)
3890 {
3891         unregister_pernet_subsys(&if6_proc_net_ops);
3892 }
3893 #endif  /* CONFIG_PROC_FS */
3894
3895 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3896 /* Check if address is a home address configured on any interface. */
3897 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3898 {
3899         int ret = 0;
3900         struct inet6_ifaddr *ifp = NULL;
3901         unsigned int hash = inet6_addr_hash(addr);
3902
3903         rcu_read_lock_bh();
3904         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3905                 if (!net_eq(dev_net(ifp->idev->dev), net))
3906                         continue;
3907                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3908                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3909                         ret = 1;
3910                         break;
3911                 }
3912         }
3913         rcu_read_unlock_bh();
3914         return ret;
3915 }
3916 #endif
3917
3918 /*
3919  *      Periodic address status verification
3920  */
3921
3922 static void addrconf_verify_rtnl(void)
3923 {
3924         unsigned long now, next, next_sec, next_sched;
3925         struct inet6_ifaddr *ifp;
3926         int i;
3927
3928         ASSERT_RTNL();
3929
3930         rcu_read_lock_bh();
3931         now = jiffies;
3932         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3933
3934         cancel_delayed_work(&addr_chk_work);
3935
3936         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3937 restart:
3938                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3939                         unsigned long age;
3940
3941                         /* When setting preferred_lft to a value not zero or
3942                          * infinity, while valid_lft is infinity
3943                          * IFA_F_PERMANENT has a non-infinity life time.
3944                          */
3945                         if ((ifp->flags & IFA_F_PERMANENT) &&
3946                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
3947                                 continue;
3948
3949                         spin_lock(&ifp->lock);
3950                         /* We try to batch several events at once. */
3951                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3952
3953                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3954                             age >= ifp->valid_lft) {
3955                                 spin_unlock(&ifp->lock);
3956                                 in6_ifa_hold(ifp);
3957                                 ipv6_del_addr(ifp);
3958                                 goto restart;
3959                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3960                                 spin_unlock(&ifp->lock);
3961                                 continue;
3962                         } else if (age >= ifp->prefered_lft) {
3963                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3964                                 int deprecate = 0;
3965
3966                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3967                                         deprecate = 1;
3968                                         ifp->flags |= IFA_F_DEPRECATED;
3969                                 }
3970
3971                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3972                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3973                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3974
3975                                 spin_unlock(&ifp->lock);
3976
3977                                 if (deprecate) {
3978                                         in6_ifa_hold(ifp);
3979
3980                                         ipv6_ifa_notify(0, ifp);
3981                                         in6_ifa_put(ifp);
3982                                         goto restart;
3983                                 }
3984                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3985                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3986                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3987                                         ifp->idev->cnf.dad_transmits *
3988                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3989
3990                                 if (age >= ifp->prefered_lft - regen_advance) {
3991                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3992                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3993                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3994                                         if (!ifp->regen_count && ifpub) {
3995                                                 ifp->regen_count++;
3996                                                 in6_ifa_hold(ifp);
3997                                                 in6_ifa_hold(ifpub);
3998                                                 spin_unlock(&ifp->lock);
3999
4000                                                 spin_lock(&ifpub->lock);
4001                                                 ifpub->regen_count = 0;
4002                                                 spin_unlock(&ifpub->lock);
4003                                                 ipv6_create_tempaddr(ifpub, ifp);
4004                                                 in6_ifa_put(ifpub);
4005                                                 in6_ifa_put(ifp);
4006                                                 goto restart;
4007                                         }
4008                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4009                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4010                                 spin_unlock(&ifp->lock);
4011                         } else {
4012                                 /* ifp->prefered_lft <= ifp->valid_lft */
4013                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4014                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4015                                 spin_unlock(&ifp->lock);
4016                         }
4017                 }
4018         }
4019
4020         next_sec = round_jiffies_up(next);
4021         next_sched = next;
4022
4023         /* If rounded timeout is accurate enough, accept it. */
4024         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4025                 next_sched = next_sec;
4026
4027         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4028         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4029                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4030
4031         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4032               now, next, next_sec, next_sched);
4033         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4034         rcu_read_unlock_bh();
4035 }
4036
4037 static void addrconf_verify_work(struct work_struct *w)
4038 {
4039         rtnl_lock();
4040         addrconf_verify_rtnl();
4041         rtnl_unlock();
4042 }
4043
4044 static void addrconf_verify(void)
4045 {
4046         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4047 }
4048
4049 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4050                                      struct in6_addr **peer_pfx)
4051 {
4052         struct in6_addr *pfx = NULL;
4053
4054         *peer_pfx = NULL;
4055
4056         if (addr)
4057                 pfx = nla_data(addr);
4058
4059         if (local) {
4060                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4061                         *peer_pfx = pfx;
4062                 pfx = nla_data(local);
4063         }
4064
4065         return pfx;
4066 }
4067
4068 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4069         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4070         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4071         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4072         [IFA_FLAGS]             = { .len = sizeof(u32) },
4073 };
4074
4075 static int
4076 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4077 {
4078         struct net *net = sock_net(skb->sk);
4079         struct ifaddrmsg *ifm;
4080         struct nlattr *tb[IFA_MAX+1];
4081         struct in6_addr *pfx, *peer_pfx;
4082         u32 ifa_flags;
4083         int err;
4084
4085         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4086         if (err < 0)
4087                 return err;
4088
4089         ifm = nlmsg_data(nlh);
4090         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4091         if (!pfx)
4092                 return -EINVAL;
4093
4094         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4095
4096         /* We ignore other flags so far. */
4097         ifa_flags &= IFA_F_MANAGETEMPADDR;
4098
4099         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4100                               ifm->ifa_prefixlen);
4101 }
4102
4103 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4104                              u32 prefered_lft, u32 valid_lft)
4105 {
4106         u32 flags;
4107         clock_t expires;
4108         unsigned long timeout;
4109         bool was_managetempaddr;
4110         bool had_prefixroute;
4111
4112         ASSERT_RTNL();
4113
4114         if (!valid_lft || (prefered_lft > valid_lft))
4115                 return -EINVAL;
4116
4117         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4118             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4119                 return -EINVAL;
4120
4121         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4122         if (addrconf_finite_timeout(timeout)) {
4123                 expires = jiffies_to_clock_t(timeout * HZ);
4124                 valid_lft = timeout;
4125                 flags = RTF_EXPIRES;
4126         } else {
4127                 expires = 0;
4128                 flags = 0;
4129                 ifa_flags |= IFA_F_PERMANENT;
4130         }
4131
4132         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4133         if (addrconf_finite_timeout(timeout)) {
4134                 if (timeout == 0)
4135                         ifa_flags |= IFA_F_DEPRECATED;
4136                 prefered_lft = timeout;
4137         }
4138
4139         spin_lock_bh(&ifp->lock);
4140         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4141         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4142                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4143         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4144                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4145                         IFA_F_NOPREFIXROUTE);
4146         ifp->flags |= ifa_flags;
4147         ifp->tstamp = jiffies;
4148         ifp->valid_lft = valid_lft;
4149         ifp->prefered_lft = prefered_lft;
4150
4151         spin_unlock_bh(&ifp->lock);
4152         if (!(ifp->flags&IFA_F_TENTATIVE))
4153                 ipv6_ifa_notify(0, ifp);
4154
4155         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4156                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4157                                       expires, flags);
4158         } else if (had_prefixroute) {
4159                 enum cleanup_prefix_rt_t action;
4160                 unsigned long rt_expires;
4161
4162                 write_lock_bh(&ifp->idev->lock);
4163                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4164                 write_unlock_bh(&ifp->idev->lock);
4165
4166                 if (action != CLEANUP_PREFIX_RT_NOP) {
4167                         cleanup_prefix_route(ifp, rt_expires,
4168                                 action == CLEANUP_PREFIX_RT_DEL);
4169                 }
4170         }
4171
4172         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4173                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4174                         valid_lft = prefered_lft = 0;
4175                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4176                                  !was_managetempaddr, jiffies);
4177         }
4178
4179         addrconf_verify_rtnl();
4180
4181         return 0;
4182 }
4183
4184 static int
4185 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4186 {
4187         struct net *net = sock_net(skb->sk);
4188         struct ifaddrmsg *ifm;
4189         struct nlattr *tb[IFA_MAX+1];
4190         struct in6_addr *pfx, *peer_pfx;
4191         struct inet6_ifaddr *ifa;
4192         struct net_device *dev;
4193         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4194         u32 ifa_flags;
4195         int err;
4196
4197         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4198         if (err < 0)
4199                 return err;
4200
4201         ifm = nlmsg_data(nlh);
4202         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4203         if (!pfx)
4204                 return -EINVAL;
4205
4206         if (tb[IFA_CACHEINFO]) {
4207                 struct ifa_cacheinfo *ci;
4208
4209                 ci = nla_data(tb[IFA_CACHEINFO]);
4210                 valid_lft = ci->ifa_valid;
4211                 preferred_lft = ci->ifa_prefered;
4212         } else {
4213                 preferred_lft = INFINITY_LIFE_TIME;
4214                 valid_lft = INFINITY_LIFE_TIME;
4215         }
4216
4217         dev =  __dev_get_by_index(net, ifm->ifa_index);
4218         if (!dev)
4219                 return -ENODEV;
4220
4221         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4222
4223         /* We ignore other flags so far. */
4224         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4225                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4226
4227         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4228         if (!ifa) {
4229                 /*
4230                  * It would be best to check for !NLM_F_CREATE here but
4231                  * userspace already relies on not having to provide this.
4232                  */
4233                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4234                                       ifm->ifa_prefixlen, ifa_flags,
4235                                       preferred_lft, valid_lft);
4236         }
4237
4238         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4239             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4240                 err = -EEXIST;
4241         else
4242                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4243
4244         in6_ifa_put(ifa);
4245
4246         return err;
4247 }
4248
4249 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4250                           u8 scope, int ifindex)
4251 {
4252         struct ifaddrmsg *ifm;
4253
4254         ifm = nlmsg_data(nlh);
4255         ifm->ifa_family = AF_INET6;
4256         ifm->ifa_prefixlen = prefixlen;
4257         ifm->ifa_flags = flags;
4258         ifm->ifa_scope = scope;
4259         ifm->ifa_index = ifindex;
4260 }
4261
4262 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4263                          unsigned long tstamp, u32 preferred, u32 valid)
4264 {
4265         struct ifa_cacheinfo ci;
4266
4267         ci.cstamp = cstamp_delta(cstamp);
4268         ci.tstamp = cstamp_delta(tstamp);
4269         ci.ifa_prefered = preferred;
4270         ci.ifa_valid = valid;
4271
4272         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4273 }
4274
4275 static inline int rt_scope(int ifa_scope)
4276 {
4277         if (ifa_scope & IFA_HOST)
4278                 return RT_SCOPE_HOST;
4279         else if (ifa_scope & IFA_LINK)
4280                 return RT_SCOPE_LINK;
4281         else if (ifa_scope & IFA_SITE)
4282                 return RT_SCOPE_SITE;
4283         else
4284                 return RT_SCOPE_UNIVERSE;
4285 }
4286
4287 static inline int inet6_ifaddr_msgsize(void)
4288 {
4289         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4290                + nla_total_size(16) /* IFA_LOCAL */
4291                + nla_total_size(16) /* IFA_ADDRESS */
4292                + nla_total_size(sizeof(struct ifa_cacheinfo))
4293                + nla_total_size(4)  /* IFA_FLAGS */;
4294 }
4295
4296 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4297                              u32 portid, u32 seq, int event, unsigned int flags)
4298 {
4299         struct nlmsghdr  *nlh;
4300         u32 preferred, valid;
4301
4302         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4303         if (!nlh)
4304                 return -EMSGSIZE;
4305
4306         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4307                       ifa->idev->dev->ifindex);
4308
4309         if (!((ifa->flags&IFA_F_PERMANENT) &&
4310               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4311                 preferred = ifa->prefered_lft;
4312                 valid = ifa->valid_lft;
4313                 if (preferred != INFINITY_LIFE_TIME) {
4314                         long tval = (jiffies - ifa->tstamp)/HZ;
4315                         if (preferred > tval)
4316                                 preferred -= tval;
4317                         else
4318                                 preferred = 0;
4319                         if (valid != INFINITY_LIFE_TIME) {
4320                                 if (valid > tval)
4321                                         valid -= tval;
4322                                 else
4323                                         valid = 0;
4324                         }
4325                 }
4326         } else {
4327                 preferred = INFINITY_LIFE_TIME;
4328                 valid = INFINITY_LIFE_TIME;
4329         }
4330
4331         if (!ipv6_addr_any(&ifa->peer_addr)) {
4332                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4333                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4334                         goto error;
4335         } else
4336                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4337                         goto error;
4338
4339         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4340                 goto error;
4341
4342         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4343                 goto error;
4344
4345         nlmsg_end(skb, nlh);
4346         return 0;
4347
4348 error:
4349         nlmsg_cancel(skb, nlh);
4350         return -EMSGSIZE;
4351 }
4352
4353 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4354                                 u32 portid, u32 seq, int event, u16 flags)
4355 {
4356         struct nlmsghdr  *nlh;
4357         u8 scope = RT_SCOPE_UNIVERSE;
4358         int ifindex = ifmca->idev->dev->ifindex;
4359
4360         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4361                 scope = RT_SCOPE_SITE;
4362
4363         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4364         if (!nlh)
4365                 return -EMSGSIZE;
4366
4367         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4368         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4369             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4370                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4371                 nlmsg_cancel(skb, nlh);
4372                 return -EMSGSIZE;
4373         }
4374
4375         nlmsg_end(skb, nlh);
4376         return 0;
4377 }
4378
4379 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4380                                 u32 portid, u32 seq, int event, unsigned int flags)
4381 {
4382         struct nlmsghdr  *nlh;
4383         u8 scope = RT_SCOPE_UNIVERSE;
4384         int ifindex = ifaca->aca_idev->dev->ifindex;
4385
4386         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4387                 scope = RT_SCOPE_SITE;
4388
4389         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4390         if (!nlh)
4391                 return -EMSGSIZE;
4392
4393         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4394         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4395             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4396                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4397                 nlmsg_cancel(skb, nlh);
4398                 return -EMSGSIZE;
4399         }
4400
4401         nlmsg_end(skb, nlh);
4402         return 0;
4403 }
4404
4405 enum addr_type_t {
4406         UNICAST_ADDR,
4407         MULTICAST_ADDR,
4408         ANYCAST_ADDR,
4409 };
4410
4411 /* called with rcu_read_lock() */
4412 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4413                           struct netlink_callback *cb, enum addr_type_t type,
4414                           int s_ip_idx, int *p_ip_idx)
4415 {
4416         struct ifmcaddr6 *ifmca;
4417         struct ifacaddr6 *ifaca;
4418         int err = 1;
4419         int ip_idx = *p_ip_idx;
4420
4421         read_lock_bh(&idev->lock);
4422         switch (type) {
4423         case UNICAST_ADDR: {
4424                 struct inet6_ifaddr *ifa;
4425
4426                 /* unicast address incl. temp addr */
4427                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4428                         if (++ip_idx < s_ip_idx)
4429                                 continue;
4430                         err = inet6_fill_ifaddr(skb, ifa,
4431                                                 NETLINK_CB(cb->skb).portid,
4432                                                 cb->nlh->nlmsg_seq,
4433                                                 RTM_NEWADDR,
4434                                                 NLM_F_MULTI);
4435                         if (err < 0)
4436                                 break;
4437                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4438                 }
4439                 break;
4440         }
4441         case MULTICAST_ADDR:
4442                 /* multicast address */
4443                 for (ifmca = idev->mc_list; ifmca;
4444                      ifmca = ifmca->next, ip_idx++) {
4445                         if (ip_idx < s_ip_idx)
4446                                 continue;
4447                         err = inet6_fill_ifmcaddr(skb, ifmca,
4448                                                   NETLINK_CB(cb->skb).portid,
4449                                                   cb->nlh->nlmsg_seq,
4450                                                   RTM_GETMULTICAST,
4451                                                   NLM_F_MULTI);
4452                         if (err < 0)
4453                                 break;
4454                 }
4455                 break;
4456         case ANYCAST_ADDR:
4457                 /* anycast address */
4458                 for (ifaca = idev->ac_list; ifaca;
4459                      ifaca = ifaca->aca_next, ip_idx++) {
4460                         if (ip_idx < s_ip_idx)
4461                                 continue;
4462                         err = inet6_fill_ifacaddr(skb, ifaca,
4463                                                   NETLINK_CB(cb->skb).portid,
4464                                                   cb->nlh->nlmsg_seq,
4465                                                   RTM_GETANYCAST,
4466                                                   NLM_F_MULTI);
4467                         if (err < 0)
4468                                 break;
4469                 }
4470                 break;
4471         default:
4472                 break;
4473         }
4474         read_unlock_bh(&idev->lock);
4475         *p_ip_idx = ip_idx;
4476         return err;
4477 }
4478
4479 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4480                            enum addr_type_t type)
4481 {
4482         struct net *net = sock_net(skb->sk);
4483         int h, s_h;
4484         int idx, ip_idx;
4485         int s_idx, s_ip_idx;
4486         struct net_device *dev;
4487         struct inet6_dev *idev;
4488         struct hlist_head *head;
4489
4490         s_h = cb->args[0];
4491         s_idx = idx = cb->args[1];
4492         s_ip_idx = ip_idx = cb->args[2];
4493
4494         rcu_read_lock();
4495         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4496         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4497                 idx = 0;
4498                 head = &net->dev_index_head[h];
4499                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4500                         if (idx < s_idx)
4501                                 goto cont;
4502                         if (h > s_h || idx > s_idx)
4503                                 s_ip_idx = 0;
4504                         ip_idx = 0;
4505                         idev = __in6_dev_get(dev);
4506                         if (!idev)
4507                                 goto cont;
4508
4509                         if (in6_dump_addrs(idev, skb, cb, type,
4510                                            s_ip_idx, &ip_idx) < 0)
4511                                 goto done;
4512 cont:
4513                         idx++;
4514                 }
4515         }
4516 done:
4517         rcu_read_unlock();
4518         cb->args[0] = h;
4519         cb->args[1] = idx;
4520         cb->args[2] = ip_idx;
4521
4522         return skb->len;
4523 }
4524
4525 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4526 {
4527         enum addr_type_t type = UNICAST_ADDR;
4528
4529         return inet6_dump_addr(skb, cb, type);
4530 }
4531
4532 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4533 {
4534         enum addr_type_t type = MULTICAST_ADDR;
4535
4536         return inet6_dump_addr(skb, cb, type);
4537 }
4538
4539
4540 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4541 {
4542         enum addr_type_t type = ANYCAST_ADDR;
4543
4544         return inet6_dump_addr(skb, cb, type);
4545 }
4546
4547 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4548 {
4549         struct net *net = sock_net(in_skb->sk);
4550         struct ifaddrmsg *ifm;
4551         struct nlattr *tb[IFA_MAX+1];
4552         struct in6_addr *addr = NULL, *peer;
4553         struct net_device *dev = NULL;
4554         struct inet6_ifaddr *ifa;
4555         struct sk_buff *skb;
4556         int err;
4557
4558         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4559         if (err < 0)
4560                 goto errout;
4561
4562         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4563         if (!addr) {
4564                 err = -EINVAL;
4565                 goto errout;
4566         }
4567
4568         ifm = nlmsg_data(nlh);
4569         if (ifm->ifa_index)
4570                 dev = __dev_get_by_index(net, ifm->ifa_index);
4571
4572         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4573         if (!ifa) {
4574                 err = -EADDRNOTAVAIL;
4575                 goto errout;
4576         }
4577
4578         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4579         if (!skb) {
4580                 err = -ENOBUFS;
4581                 goto errout_ifa;
4582         }
4583
4584         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4585                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4586         if (err < 0) {
4587                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4588                 WARN_ON(err == -EMSGSIZE);
4589                 kfree_skb(skb);
4590                 goto errout_ifa;
4591         }
4592         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4593 errout_ifa:
4594         in6_ifa_put(ifa);
4595 errout:
4596         return err;
4597 }
4598
4599 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4600 {
4601         struct sk_buff *skb;
4602         struct net *net = dev_net(ifa->idev->dev);
4603         int err = -ENOBUFS;
4604
4605         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4606         if (!skb)
4607                 goto errout;
4608
4609         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4610         if (err < 0) {
4611                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4612                 WARN_ON(err == -EMSGSIZE);
4613                 kfree_skb(skb);
4614                 goto errout;
4615         }
4616         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4617         return;
4618 errout:
4619         if (err < 0)
4620                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4621 }
4622
4623 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4624                                 __s32 *array, int bytes)
4625 {
4626         BUG_ON(bytes < (DEVCONF_MAX * 4));
4627
4628         memset(array, 0, bytes);
4629         array[DEVCONF_FORWARDING] = cnf->forwarding;
4630         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4631         array[DEVCONF_MTU6] = cnf->mtu6;
4632         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4633         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4634         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4635         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4636         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4637         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4638                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4639         array[DEVCONF_RTR_SOLICIT_DELAY] =
4640                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4641         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4642         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4643                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4644         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4645                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4646         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4647         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4648         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4649         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4650         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4651         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4652         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4653         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4654         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4655 #ifdef CONFIG_IPV6_ROUTER_PREF
4656         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4657         array[DEVCONF_RTR_PROBE_INTERVAL] =
4658                 jiffies_to_msecs(cnf->rtr_probe_interval);
4659 #ifdef CONFIG_IPV6_ROUTE_INFO
4660         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4661 #endif
4662 #endif
4663         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4664         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4665 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4666         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4667         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4668 #endif
4669 #ifdef CONFIG_IPV6_MROUTE
4670         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4671 #endif
4672         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4673         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4674         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4675         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4676         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4677         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4678         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4679         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4680         /* we omit DEVCONF_STABLE_SECRET for now */
4681         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4682 }
4683
4684 static inline size_t inet6_ifla6_size(void)
4685 {
4686         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4687              + nla_total_size(sizeof(struct ifla_cacheinfo))
4688              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4689              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4690              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4691              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4692 }
4693
4694 static inline size_t inet6_if_nlmsg_size(void)
4695 {
4696         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4697                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4698                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4699                + nla_total_size(4) /* IFLA_MTU */
4700                + nla_total_size(4) /* IFLA_LINK */
4701                + nla_total_size(1) /* IFLA_OPERSTATE */
4702                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4703 }
4704
4705 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4706                                       int items, int bytes)
4707 {
4708         int i;
4709         int pad = bytes - sizeof(u64) * items;
4710         BUG_ON(pad < 0);
4711
4712         /* Use put_unaligned() because stats may not be aligned for u64. */
4713         put_unaligned(items, &stats[0]);
4714         for (i = 1; i < items; i++)
4715                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4716
4717         memset(&stats[items], 0, pad);
4718 }
4719
4720 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4721                                         int bytes, size_t syncpoff)
4722 {
4723         int i, c;
4724         u64 buff[IPSTATS_MIB_MAX];
4725         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4726
4727         BUG_ON(pad < 0);
4728
4729         memset(buff, 0, sizeof(buff));
4730         buff[0] = IPSTATS_MIB_MAX;
4731
4732         for_each_possible_cpu(c) {
4733                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4734                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4735         }
4736
4737         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4738         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4739 }
4740
4741 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4742                              int bytes)
4743 {
4744         switch (attrtype) {
4745         case IFLA_INET6_STATS:
4746                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4747                                      offsetof(struct ipstats_mib, syncp));
4748                 break;
4749         case IFLA_INET6_ICMP6STATS:
4750                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4751                 break;
4752         }
4753 }
4754
4755 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4756                                   u32 ext_filter_mask)
4757 {
4758         struct nlattr *nla;
4759         struct ifla_cacheinfo ci;
4760
4761         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4762                 goto nla_put_failure;
4763         ci.max_reasm_len = IPV6_MAXPLEN;
4764         ci.tstamp = cstamp_delta(idev->tstamp);
4765         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4766         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4767         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4768                 goto nla_put_failure;
4769         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4770         if (!nla)
4771                 goto nla_put_failure;
4772         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4773
4774         /* XXX - MC not implemented */
4775
4776         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4777                 return 0;
4778
4779         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4780         if (!nla)
4781                 goto nla_put_failure;
4782         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4783
4784         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4785         if (!nla)
4786                 goto nla_put_failure;
4787         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4788
4789         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4790         if (!nla)
4791                 goto nla_put_failure;
4792
4793         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4794                 goto nla_put_failure;
4795
4796         read_lock_bh(&idev->lock);
4797         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4798         read_unlock_bh(&idev->lock);
4799
4800         return 0;
4801
4802 nla_put_failure:
4803         return -EMSGSIZE;
4804 }
4805
4806 static size_t inet6_get_link_af_size(const struct net_device *dev,
4807                                      u32 ext_filter_mask)
4808 {
4809         if (!__in6_dev_get(dev))
4810                 return 0;
4811
4812         return inet6_ifla6_size();
4813 }
4814
4815 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4816                               u32 ext_filter_mask)
4817 {
4818         struct inet6_dev *idev = __in6_dev_get(dev);
4819
4820         if (!idev)
4821                 return -ENODATA;
4822
4823         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4824                 return -EMSGSIZE;
4825
4826         return 0;
4827 }
4828
4829 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4830 {
4831         struct inet6_ifaddr *ifp;
4832         struct net_device *dev = idev->dev;
4833         bool update_rs = false;
4834         struct in6_addr ll_addr;
4835
4836         ASSERT_RTNL();
4837
4838         if (!token)
4839                 return -EINVAL;
4840         if (ipv6_addr_any(token))
4841                 return -EINVAL;
4842         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4843                 return -EINVAL;
4844         if (!ipv6_accept_ra(idev))
4845                 return -EINVAL;
4846         if (idev->cnf.rtr_solicits <= 0)
4847                 return -EINVAL;
4848
4849         write_lock_bh(&idev->lock);
4850
4851         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4852         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4853
4854         write_unlock_bh(&idev->lock);
4855
4856         if (!idev->dead && (idev->if_flags & IF_READY) &&
4857             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4858                              IFA_F_OPTIMISTIC)) {
4859
4860                 /* If we're not ready, then normal ifup will take care
4861                  * of this. Otherwise, we need to request our rs here.
4862                  */
4863                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4864                 update_rs = true;
4865         }
4866
4867         write_lock_bh(&idev->lock);
4868
4869         if (update_rs) {
4870                 idev->if_flags |= IF_RS_SENT;
4871                 idev->rs_probes = 1;
4872                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4873         }
4874
4875         /* Well, that's kinda nasty ... */
4876         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4877                 spin_lock(&ifp->lock);
4878                 if (ifp->tokenized) {
4879                         ifp->valid_lft = 0;
4880                         ifp->prefered_lft = 0;
4881                 }
4882                 spin_unlock(&ifp->lock);
4883         }
4884
4885         write_unlock_bh(&idev->lock);
4886         inet6_ifinfo_notify(RTM_NEWLINK, idev);
4887         addrconf_verify_rtnl();
4888         return 0;
4889 }
4890
4891 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4892         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
4893         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
4894 };
4895
4896 static int inet6_validate_link_af(const struct net_device *dev,
4897                                   const struct nlattr *nla)
4898 {
4899         struct nlattr *tb[IFLA_INET6_MAX + 1];
4900
4901         if (dev && !__in6_dev_get(dev))
4902                 return -EAFNOSUPPORT;
4903
4904         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4905 }
4906
4907 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4908 {
4909         int err = -EINVAL;
4910         struct inet6_dev *idev = __in6_dev_get(dev);
4911         struct nlattr *tb[IFLA_INET6_MAX + 1];
4912
4913         if (!idev)
4914                 return -EAFNOSUPPORT;
4915
4916         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4917                 BUG();
4918
4919         if (tb[IFLA_INET6_TOKEN]) {
4920                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4921                 if (err)
4922                         return err;
4923         }
4924
4925         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4926                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4927
4928                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4929                     mode != IN6_ADDR_GEN_MODE_NONE &&
4930                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4931                         return -EINVAL;
4932
4933                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4934                     !idev->cnf.stable_secret.initialized &&
4935                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4936                         return -EINVAL;
4937
4938                 idev->addr_gen_mode = mode;
4939                 err = 0;
4940         }
4941
4942         return err;
4943 }
4944
4945 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4946                              u32 portid, u32 seq, int event, unsigned int flags)
4947 {
4948         struct net_device *dev = idev->dev;
4949         struct ifinfomsg *hdr;
4950         struct nlmsghdr *nlh;
4951         void *protoinfo;
4952
4953         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4954         if (!nlh)
4955                 return -EMSGSIZE;
4956
4957         hdr = nlmsg_data(nlh);
4958         hdr->ifi_family = AF_INET6;
4959         hdr->__ifi_pad = 0;
4960         hdr->ifi_type = dev->type;
4961         hdr->ifi_index = dev->ifindex;
4962         hdr->ifi_flags = dev_get_flags(dev);
4963         hdr->ifi_change = 0;
4964
4965         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4966             (dev->addr_len &&
4967              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4968             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4969             (dev->ifindex != dev_get_iflink(dev) &&
4970              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4971             nla_put_u8(skb, IFLA_OPERSTATE,
4972                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4973                 goto nla_put_failure;
4974         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4975         if (!protoinfo)
4976                 goto nla_put_failure;
4977
4978         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4979                 goto nla_put_failure;
4980
4981         nla_nest_end(skb, protoinfo);
4982         nlmsg_end(skb, nlh);
4983         return 0;
4984
4985 nla_put_failure:
4986         nlmsg_cancel(skb, nlh);
4987         return -EMSGSIZE;
4988 }
4989
4990 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4991 {
4992         struct net *net = sock_net(skb->sk);
4993         int h, s_h;
4994         int idx = 0, s_idx;
4995         struct net_device *dev;
4996         struct inet6_dev *idev;
4997         struct hlist_head *head;
4998
4999         s_h = cb->args[0];
5000         s_idx = cb->args[1];
5001
5002         rcu_read_lock();
5003         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5004                 idx = 0;
5005                 head = &net->dev_index_head[h];
5006                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5007                         if (idx < s_idx)
5008                                 goto cont;
5009                         idev = __in6_dev_get(dev);
5010                         if (!idev)
5011                                 goto cont;
5012                         if (inet6_fill_ifinfo(skb, idev,
5013                                               NETLINK_CB(cb->skb).portid,
5014                                               cb->nlh->nlmsg_seq,
5015                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5016                                 goto out;
5017 cont:
5018                         idx++;
5019                 }
5020         }
5021 out:
5022         rcu_read_unlock();
5023         cb->args[1] = idx;
5024         cb->args[0] = h;
5025
5026         return skb->len;
5027 }
5028
5029 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5030 {
5031         struct sk_buff *skb;
5032         struct net *net = dev_net(idev->dev);
5033         int err = -ENOBUFS;
5034
5035         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5036         if (!skb)
5037                 goto errout;
5038
5039         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5040         if (err < 0) {
5041                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5042                 WARN_ON(err == -EMSGSIZE);
5043                 kfree_skb(skb);
5044                 goto errout;
5045         }
5046         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5047         return;
5048 errout:
5049         if (err < 0)
5050                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5051 }
5052
5053 static inline size_t inet6_prefix_nlmsg_size(void)
5054 {
5055         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5056                + nla_total_size(sizeof(struct in6_addr))
5057                + nla_total_size(sizeof(struct prefix_cacheinfo));
5058 }
5059
5060 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5061                              struct prefix_info *pinfo, u32 portid, u32 seq,
5062                              int event, unsigned int flags)
5063 {
5064         struct prefixmsg *pmsg;
5065         struct nlmsghdr *nlh;
5066         struct prefix_cacheinfo ci;
5067
5068         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5069         if (!nlh)
5070                 return -EMSGSIZE;
5071
5072         pmsg = nlmsg_data(nlh);
5073         pmsg->prefix_family = AF_INET6;
5074         pmsg->prefix_pad1 = 0;
5075         pmsg->prefix_pad2 = 0;
5076         pmsg->prefix_ifindex = idev->dev->ifindex;
5077         pmsg->prefix_len = pinfo->prefix_len;
5078         pmsg->prefix_type = pinfo->type;
5079         pmsg->prefix_pad3 = 0;
5080         pmsg->prefix_flags = 0;
5081         if (pinfo->onlink)
5082                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5083         if (pinfo->autoconf)
5084                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5085
5086         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5087                 goto nla_put_failure;
5088         ci.preferred_time = ntohl(pinfo->prefered);
5089         ci.valid_time = ntohl(pinfo->valid);
5090         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5091                 goto nla_put_failure;
5092         nlmsg_end(skb, nlh);
5093         return 0;
5094
5095 nla_put_failure:
5096         nlmsg_cancel(skb, nlh);
5097         return -EMSGSIZE;
5098 }
5099
5100 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5101                          struct prefix_info *pinfo)
5102 {
5103         struct sk_buff *skb;
5104         struct net *net = dev_net(idev->dev);
5105         int err = -ENOBUFS;
5106
5107         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5108         if (!skb)
5109                 goto errout;
5110
5111         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5112         if (err < 0) {
5113                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5114                 WARN_ON(err == -EMSGSIZE);
5115                 kfree_skb(skb);
5116                 goto errout;
5117         }
5118         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5119         return;
5120 errout:
5121         if (err < 0)
5122                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5123 }
5124
5125 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5126 {
5127         struct net *net = dev_net(ifp->idev->dev);
5128
5129         if (event)
5130                 ASSERT_RTNL();
5131
5132         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5133
5134         switch (event) {
5135         case RTM_NEWADDR:
5136                 /*
5137                  * If the address was optimistic
5138                  * we inserted the route at the start of
5139                  * our DAD process, so we don't need
5140                  * to do it again
5141                  */
5142                 if (!(ifp->rt->rt6i_node))
5143                         ip6_ins_rt(ifp->rt);
5144                 if (ifp->idev->cnf.forwarding)
5145                         addrconf_join_anycast(ifp);
5146                 if (!ipv6_addr_any(&ifp->peer_addr))
5147                         addrconf_prefix_route(&ifp->peer_addr, 128,
5148                                               ifp->idev->dev, 0, 0);
5149                 break;
5150         case RTM_DELADDR:
5151                 if (ifp->idev->cnf.forwarding)
5152                         addrconf_leave_anycast(ifp);
5153                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5154                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5155                         struct rt6_info *rt;
5156
5157                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5158                                                        ifp->idev->dev, 0, 0);
5159                         if (rt)
5160                                 ip6_del_rt(rt);
5161                 }
5162                 dst_hold(&ifp->rt->dst);
5163
5164                 ip6_del_rt(ifp->rt);
5165
5166                 rt_genid_bump_ipv6(net);
5167                 break;
5168         }
5169         atomic_inc(&net->ipv6.dev_addr_genid);
5170 }
5171
5172 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5173 {
5174         rcu_read_lock_bh();
5175         if (likely(ifp->idev->dead == 0))
5176                 __ipv6_ifa_notify(event, ifp);
5177         rcu_read_unlock_bh();
5178 }
5179
5180 #ifdef CONFIG_SYSCTL
5181
5182 static
5183 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5184                            void __user *buffer, size_t *lenp, loff_t *ppos)
5185 {
5186         int *valp = ctl->data;
5187         int val = *valp;
5188         loff_t pos = *ppos;
5189         struct ctl_table lctl;
5190         int ret;
5191
5192         /*
5193          * ctl->data points to idev->cnf.forwarding, we should
5194          * not modify it until we get the rtnl lock.
5195          */
5196         lctl = *ctl;
5197         lctl.data = &val;
5198
5199         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5200
5201         if (write)
5202                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5203         if (ret)
5204                 *ppos = pos;
5205         return ret;
5206 }
5207
5208 static
5209 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5210                         void __user *buffer, size_t *lenp, loff_t *ppos)
5211 {
5212         struct inet6_dev *idev = ctl->extra1;
5213         int min_mtu = IPV6_MIN_MTU;
5214         struct ctl_table lctl;
5215
5216         lctl = *ctl;
5217         lctl.extra1 = &min_mtu;
5218         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5219
5220         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5221 }
5222
5223 static void dev_disable_change(struct inet6_dev *idev)
5224 {
5225         struct netdev_notifier_info info;
5226
5227         if (!idev || !idev->dev)
5228                 return;
5229
5230         netdev_notifier_info_init(&info, idev->dev);
5231         if (idev->cnf.disable_ipv6)
5232                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5233         else
5234                 addrconf_notify(NULL, NETDEV_UP, &info);
5235 }
5236
5237 static void addrconf_disable_change(struct net *net, __s32 newf)
5238 {
5239         struct net_device *dev;
5240         struct inet6_dev *idev;
5241
5242         rcu_read_lock();
5243         for_each_netdev_rcu(net, dev) {
5244                 idev = __in6_dev_get(dev);
5245                 if (idev) {
5246                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5247                         idev->cnf.disable_ipv6 = newf;
5248                         if (changed)
5249                                 dev_disable_change(idev);
5250                 }
5251         }
5252         rcu_read_unlock();
5253 }
5254
5255 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5256 {
5257         struct net *net;
5258         int old;
5259
5260         if (!rtnl_trylock())
5261                 return restart_syscall();
5262
5263         net = (struct net *)table->extra2;
5264         old = *p;
5265         *p = newf;
5266
5267         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5268                 rtnl_unlock();
5269                 return 0;
5270         }
5271
5272         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5273                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5274                 addrconf_disable_change(net, newf);
5275         } else if ((!newf) ^ (!old))
5276                 dev_disable_change((struct inet6_dev *)table->extra1);
5277
5278         rtnl_unlock();
5279         return 0;
5280 }
5281
5282 static
5283 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5284                             void __user *buffer, size_t *lenp, loff_t *ppos)
5285 {
5286         int *valp = ctl->data;
5287         int val = *valp;
5288         loff_t pos = *ppos;
5289         struct ctl_table lctl;
5290         int ret;
5291
5292         /*
5293          * ctl->data points to idev->cnf.disable_ipv6, we should
5294          * not modify it until we get the rtnl lock.
5295          */
5296         lctl = *ctl;
5297         lctl.data = &val;
5298
5299         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5300
5301         if (write)
5302                 ret = addrconf_disable_ipv6(ctl, valp, val);
5303         if (ret)
5304                 *ppos = pos;
5305         return ret;
5306 }
5307
5308 static
5309 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5310                               void __user *buffer, size_t *lenp, loff_t *ppos)
5311 {
5312         int *valp = ctl->data;
5313         int ret;
5314         int old, new;
5315
5316         old = *valp;
5317         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5318         new = *valp;
5319
5320         if (write && old != new) {
5321                 struct net *net = ctl->extra2;
5322
5323                 if (!rtnl_trylock())
5324                         return restart_syscall();
5325
5326                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5327                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5328                                                      NETCONFA_IFINDEX_DEFAULT,
5329                                                      net->ipv6.devconf_dflt);
5330                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5331                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5332                                                      NETCONFA_IFINDEX_ALL,
5333                                                      net->ipv6.devconf_all);
5334                 else {
5335                         struct inet6_dev *idev = ctl->extra1;
5336
5337                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5338                                                      idev->dev->ifindex,
5339                                                      &idev->cnf);
5340                 }
5341                 rtnl_unlock();
5342         }
5343
5344         return ret;
5345 }
5346
5347 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5348                                          void __user *buffer, size_t *lenp,
5349                                          loff_t *ppos)
5350 {
5351         int err;
5352         struct in6_addr addr;
5353         char str[IPV6_MAX_STRLEN];
5354         struct ctl_table lctl = *ctl;
5355         struct net *net = ctl->extra2;
5356         struct ipv6_stable_secret *secret = ctl->data;
5357
5358         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5359                 return -EIO;
5360
5361         lctl.maxlen = IPV6_MAX_STRLEN;
5362         lctl.data = str;
5363
5364         if (!rtnl_trylock())
5365                 return restart_syscall();
5366
5367         if (!write && !secret->initialized) {
5368                 err = -EIO;
5369                 goto out;
5370         }
5371
5372         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5373         if (err >= sizeof(str)) {
5374                 err = -EIO;
5375                 goto out;
5376         }
5377
5378         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5379         if (err || !write)
5380                 goto out;
5381
5382         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5383                 err = -EIO;
5384                 goto out;
5385         }
5386
5387         secret->initialized = true;
5388         secret->secret = addr;
5389
5390         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5391                 struct net_device *dev;
5392
5393                 for_each_netdev(net, dev) {
5394                         struct inet6_dev *idev = __in6_dev_get(dev);
5395
5396                         if (idev) {
5397                                 idev->addr_gen_mode =
5398                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5399                         }
5400                 }
5401         } else {
5402                 struct inet6_dev *idev = ctl->extra1;
5403
5404                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5405         }
5406
5407 out:
5408         rtnl_unlock();
5409
5410         return err;
5411 }
5412
5413 static
5414 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5415                                                 int write,
5416                                                 void __user *buffer,
5417                                                 size_t *lenp,
5418                                                 loff_t *ppos)
5419 {
5420         int *valp = ctl->data;
5421         int val = *valp;
5422         loff_t pos = *ppos;
5423         struct ctl_table lctl;
5424         int ret;
5425
5426         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5427          * we should not modify it until we get the rtnl lock.
5428          */
5429         lctl = *ctl;
5430         lctl.data = &val;
5431
5432         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5433
5434         if (write)
5435                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5436         if (ret)
5437                 *ppos = pos;
5438         return ret;
5439 }
5440
5441 static struct addrconf_sysctl_table
5442 {
5443         struct ctl_table_header *sysctl_header;
5444         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5445 } addrconf_sysctl __read_mostly = {
5446         .sysctl_header = NULL,
5447         .addrconf_vars = {
5448                 {
5449                         .procname       = "forwarding",
5450                         .data           = &ipv6_devconf.forwarding,
5451                         .maxlen         = sizeof(int),
5452                         .mode           = 0644,
5453                         .proc_handler   = addrconf_sysctl_forward,
5454                 },
5455                 {
5456                         .procname       = "hop_limit",
5457                         .data           = &ipv6_devconf.hop_limit,
5458                         .maxlen         = sizeof(int),
5459                         .mode           = 0644,
5460                         .proc_handler   = proc_dointvec,
5461                 },
5462                 {
5463                         .procname       = "mtu",
5464                         .data           = &ipv6_devconf.mtu6,
5465                         .maxlen         = sizeof(int),
5466                         .mode           = 0644,
5467                         .proc_handler   = addrconf_sysctl_mtu,
5468                 },
5469                 {
5470                         .procname       = "accept_ra",
5471                         .data           = &ipv6_devconf.accept_ra,
5472                         .maxlen         = sizeof(int),
5473                         .mode           = 0644,
5474                         .proc_handler   = proc_dointvec,
5475                 },
5476                 {
5477                         .procname       = "accept_redirects",
5478                         .data           = &ipv6_devconf.accept_redirects,
5479                         .maxlen         = sizeof(int),
5480                         .mode           = 0644,
5481                         .proc_handler   = proc_dointvec,
5482                 },
5483                 {
5484                         .procname       = "autoconf",
5485                         .data           = &ipv6_devconf.autoconf,
5486                         .maxlen         = sizeof(int),
5487                         .mode           = 0644,
5488                         .proc_handler   = proc_dointvec,
5489                 },
5490                 {
5491                         .procname       = "dad_transmits",
5492                         .data           = &ipv6_devconf.dad_transmits,
5493                         .maxlen         = sizeof(int),
5494                         .mode           = 0644,
5495                         .proc_handler   = proc_dointvec,
5496                 },
5497                 {
5498                         .procname       = "router_solicitations",
5499                         .data           = &ipv6_devconf.rtr_solicits,
5500                         .maxlen         = sizeof(int),
5501                         .mode           = 0644,
5502                         .proc_handler   = proc_dointvec,
5503                 },
5504                 {
5505                         .procname       = "router_solicitation_interval",
5506                         .data           = &ipv6_devconf.rtr_solicit_interval,
5507                         .maxlen         = sizeof(int),
5508                         .mode           = 0644,
5509                         .proc_handler   = proc_dointvec_jiffies,
5510                 },
5511                 {
5512                         .procname       = "router_solicitation_delay",
5513                         .data           = &ipv6_devconf.rtr_solicit_delay,
5514                         .maxlen         = sizeof(int),
5515                         .mode           = 0644,
5516                         .proc_handler   = proc_dointvec_jiffies,
5517                 },
5518                 {
5519                         .procname       = "force_mld_version",
5520                         .data           = &ipv6_devconf.force_mld_version,
5521                         .maxlen         = sizeof(int),
5522                         .mode           = 0644,
5523                         .proc_handler   = proc_dointvec,
5524                 },
5525                 {
5526                         .procname       = "mldv1_unsolicited_report_interval",
5527                         .data           =
5528                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
5529                         .maxlen         = sizeof(int),
5530                         .mode           = 0644,
5531                         .proc_handler   = proc_dointvec_ms_jiffies,
5532                 },
5533                 {
5534                         .procname       = "mldv2_unsolicited_report_interval",
5535                         .data           =
5536                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
5537                         .maxlen         = sizeof(int),
5538                         .mode           = 0644,
5539                         .proc_handler   = proc_dointvec_ms_jiffies,
5540                 },
5541                 {
5542                         .procname       = "use_tempaddr",
5543                         .data           = &ipv6_devconf.use_tempaddr,
5544                         .maxlen         = sizeof(int),
5545                         .mode           = 0644,
5546                         .proc_handler   = proc_dointvec,
5547                 },
5548                 {
5549                         .procname       = "temp_valid_lft",
5550                         .data           = &ipv6_devconf.temp_valid_lft,
5551                         .maxlen         = sizeof(int),
5552                         .mode           = 0644,
5553                         .proc_handler   = proc_dointvec,
5554                 },
5555                 {
5556                         .procname       = "temp_prefered_lft",
5557                         .data           = &ipv6_devconf.temp_prefered_lft,
5558                         .maxlen         = sizeof(int),
5559                         .mode           = 0644,
5560                         .proc_handler   = proc_dointvec,
5561                 },
5562                 {
5563                         .procname       = "regen_max_retry",
5564                         .data           = &ipv6_devconf.regen_max_retry,
5565                         .maxlen         = sizeof(int),
5566                         .mode           = 0644,
5567                         .proc_handler   = proc_dointvec,
5568                 },
5569                 {
5570                         .procname       = "max_desync_factor",
5571                         .data           = &ipv6_devconf.max_desync_factor,
5572                         .maxlen         = sizeof(int),
5573                         .mode           = 0644,
5574                         .proc_handler   = proc_dointvec,
5575                 },
5576                 {
5577                         .procname       = "max_addresses",
5578                         .data           = &ipv6_devconf.max_addresses,
5579                         .maxlen         = sizeof(int),
5580                         .mode           = 0644,
5581                         .proc_handler   = proc_dointvec,
5582                 },
5583                 {
5584                         .procname       = "accept_ra_defrtr",
5585                         .data           = &ipv6_devconf.accept_ra_defrtr,
5586                         .maxlen         = sizeof(int),
5587                         .mode           = 0644,
5588                         .proc_handler   = proc_dointvec,
5589                 },
5590                 {
5591                         .procname       = "accept_ra_min_hop_limit",
5592                         .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5593                         .maxlen         = sizeof(int),
5594                         .mode           = 0644,
5595                         .proc_handler   = proc_dointvec,
5596                 },
5597                 {
5598                         .procname       = "accept_ra_pinfo",
5599                         .data           = &ipv6_devconf.accept_ra_pinfo,
5600                         .maxlen         = sizeof(int),
5601                         .mode           = 0644,
5602                         .proc_handler   = proc_dointvec,
5603                 },
5604 #ifdef CONFIG_IPV6_ROUTER_PREF
5605                 {
5606                         .procname       = "accept_ra_rtr_pref",
5607                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
5608                         .maxlen         = sizeof(int),
5609                         .mode           = 0644,
5610                         .proc_handler   = proc_dointvec,
5611                 },
5612                 {
5613                         .procname       = "router_probe_interval",
5614                         .data           = &ipv6_devconf.rtr_probe_interval,
5615                         .maxlen         = sizeof(int),
5616                         .mode           = 0644,
5617                         .proc_handler   = proc_dointvec_jiffies,
5618                 },
5619 #ifdef CONFIG_IPV6_ROUTE_INFO
5620                 {
5621                         .procname       = "accept_ra_rt_info_max_plen",
5622                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5623                         .maxlen         = sizeof(int),
5624                         .mode           = 0644,
5625                         .proc_handler   = proc_dointvec,
5626                 },
5627 #endif
5628 #endif
5629                 {
5630                         .procname       = "proxy_ndp",
5631                         .data           = &ipv6_devconf.proxy_ndp,
5632                         .maxlen         = sizeof(int),
5633                         .mode           = 0644,
5634                         .proc_handler   = addrconf_sysctl_proxy_ndp,
5635                 },
5636                 {
5637                         .procname       = "accept_source_route",
5638                         .data           = &ipv6_devconf.accept_source_route,
5639                         .maxlen         = sizeof(int),
5640                         .mode           = 0644,
5641                         .proc_handler   = proc_dointvec,
5642                 },
5643 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5644                 {
5645                         .procname       = "optimistic_dad",
5646                         .data           = &ipv6_devconf.optimistic_dad,
5647                         .maxlen         = sizeof(int),
5648                         .mode           = 0644,
5649                         .proc_handler   = proc_dointvec,
5650
5651                 },
5652                 {
5653                         .procname       = "use_optimistic",
5654                         .data           = &ipv6_devconf.use_optimistic,
5655                         .maxlen         = sizeof(int),
5656                         .mode           = 0644,
5657                         .proc_handler   = proc_dointvec,
5658
5659                 },
5660 #endif
5661 #ifdef CONFIG_IPV6_MROUTE
5662                 {
5663                         .procname       = "mc_forwarding",
5664                         .data           = &ipv6_devconf.mc_forwarding,
5665                         .maxlen         = sizeof(int),
5666                         .mode           = 0444,
5667                         .proc_handler   = proc_dointvec,
5668                 },
5669 #endif
5670                 {
5671                         .procname       = "disable_ipv6",
5672                         .data           = &ipv6_devconf.disable_ipv6,
5673                         .maxlen         = sizeof(int),
5674                         .mode           = 0644,
5675                         .proc_handler   = addrconf_sysctl_disable,
5676                 },
5677                 {
5678                         .procname       = "accept_dad",
5679                         .data           = &ipv6_devconf.accept_dad,
5680                         .maxlen         = sizeof(int),
5681                         .mode           = 0644,
5682                         .proc_handler   = proc_dointvec,
5683                 },
5684                 {
5685                         .procname       = "force_tllao",
5686                         .data           = &ipv6_devconf.force_tllao,
5687                         .maxlen         = sizeof(int),
5688                         .mode           = 0644,
5689                         .proc_handler   = proc_dointvec
5690                 },
5691                 {
5692                         .procname       = "ndisc_notify",
5693                         .data           = &ipv6_devconf.ndisc_notify,
5694                         .maxlen         = sizeof(int),
5695                         .mode           = 0644,
5696                         .proc_handler   = proc_dointvec
5697                 },
5698                 {
5699                         .procname       = "suppress_frag_ndisc",
5700                         .data           = &ipv6_devconf.suppress_frag_ndisc,
5701                         .maxlen         = sizeof(int),
5702                         .mode           = 0644,
5703                         .proc_handler   = proc_dointvec
5704                 },
5705                 {
5706                         .procname       = "accept_ra_from_local",
5707                         .data           = &ipv6_devconf.accept_ra_from_local,
5708                         .maxlen         = sizeof(int),
5709                         .mode           = 0644,
5710                         .proc_handler   = proc_dointvec,
5711                 },
5712                 {
5713                         .procname       = "accept_ra_mtu",
5714                         .data           = &ipv6_devconf.accept_ra_mtu,
5715                         .maxlen         = sizeof(int),
5716                         .mode           = 0644,
5717                         .proc_handler   = proc_dointvec,
5718                 },
5719                 {
5720                         .procname       = "stable_secret",
5721                         .data           = &ipv6_devconf.stable_secret,
5722                         .maxlen         = IPV6_MAX_STRLEN,
5723                         .mode           = 0600,
5724                         .proc_handler   = addrconf_sysctl_stable_secret,
5725                 },
5726                 {
5727                         .procname       = "use_oif_addrs_only",
5728                         .data           = &ipv6_devconf.use_oif_addrs_only,
5729                         .maxlen         = sizeof(int),
5730                         .mode           = 0644,
5731                         .proc_handler   = proc_dointvec,
5732                 },
5733                 {
5734                         .procname       = "ignore_routes_with_linkdown",
5735                         .data           = &ipv6_devconf.ignore_routes_with_linkdown,
5736                         .maxlen         = sizeof(int),
5737                         .mode           = 0644,
5738                         .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
5739                 },
5740                 {
5741                         /* sentinel */
5742                 }
5743         },
5744 };
5745
5746 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5747                 struct inet6_dev *idev, struct ipv6_devconf *p)
5748 {
5749         int i;
5750         struct addrconf_sysctl_table *t;
5751         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5752
5753         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5754         if (!t)
5755                 goto out;
5756
5757         for (i = 0; t->addrconf_vars[i].data; i++) {
5758                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5759                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5760                 t->addrconf_vars[i].extra2 = net;
5761         }
5762
5763         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5764
5765         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5766         if (!t->sysctl_header)
5767                 goto free;
5768
5769         p->sysctl = t;
5770         return 0;
5771
5772 free:
5773         kfree(t);
5774 out:
5775         return -ENOBUFS;
5776 }
5777
5778 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5779 {
5780         struct addrconf_sysctl_table *t;
5781
5782         if (!p->sysctl)
5783                 return;
5784
5785         t = p->sysctl;
5786         p->sysctl = NULL;
5787         unregister_net_sysctl_table(t->sysctl_header);
5788         kfree(t);
5789 }
5790
5791 static int addrconf_sysctl_register(struct inet6_dev *idev)
5792 {
5793         int err;
5794
5795         if (!sysctl_dev_name_is_allowed(idev->dev->name))
5796                 return -EINVAL;
5797
5798         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5799                                     &ndisc_ifinfo_sysctl_change);
5800         if (err)
5801                 return err;
5802         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5803                                          idev, &idev->cnf);
5804         if (err)
5805                 neigh_sysctl_unregister(idev->nd_parms);
5806
5807         return err;
5808 }
5809
5810 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5811 {
5812         __addrconf_sysctl_unregister(&idev->cnf);
5813         neigh_sysctl_unregister(idev->nd_parms);
5814 }
5815
5816
5817 #endif
5818
5819 static int __net_init addrconf_init_net(struct net *net)
5820 {
5821         int err = -ENOMEM;
5822         struct ipv6_devconf *all, *dflt;
5823
5824         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5825         if (!all)
5826                 goto err_alloc_all;
5827
5828         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5829         if (!dflt)
5830                 goto err_alloc_dflt;
5831
5832         /* these will be inherited by all namespaces */
5833         dflt->autoconf = ipv6_defaults.autoconf;
5834         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5835
5836         dflt->stable_secret.initialized = false;
5837         all->stable_secret.initialized = false;
5838
5839         net->ipv6.devconf_all = all;
5840         net->ipv6.devconf_dflt = dflt;
5841
5842 #ifdef CONFIG_SYSCTL
5843         err = __addrconf_sysctl_register(net, "all", NULL, all);
5844         if (err < 0)
5845                 goto err_reg_all;
5846
5847         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5848         if (err < 0)
5849                 goto err_reg_dflt;
5850 #endif
5851         return 0;
5852
5853 #ifdef CONFIG_SYSCTL
5854 err_reg_dflt:
5855         __addrconf_sysctl_unregister(all);
5856 err_reg_all:
5857         kfree(dflt);
5858 #endif
5859 err_alloc_dflt:
5860         kfree(all);
5861 err_alloc_all:
5862         return err;
5863 }
5864
5865 static void __net_exit addrconf_exit_net(struct net *net)
5866 {
5867 #ifdef CONFIG_SYSCTL
5868         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5869         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5870 #endif
5871         kfree(net->ipv6.devconf_dflt);
5872         kfree(net->ipv6.devconf_all);
5873 }
5874
5875 static struct pernet_operations addrconf_ops = {
5876         .init = addrconf_init_net,
5877         .exit = addrconf_exit_net,
5878 };
5879
5880 static struct rtnl_af_ops inet6_ops __read_mostly = {
5881         .family           = AF_INET6,
5882         .fill_link_af     = inet6_fill_link_af,
5883         .get_link_af_size = inet6_get_link_af_size,
5884         .validate_link_af = inet6_validate_link_af,
5885         .set_link_af      = inet6_set_link_af,
5886 };
5887
5888 /*
5889  *      Init / cleanup code
5890  */
5891
5892 int __init addrconf_init(void)
5893 {
5894         struct inet6_dev *idev;
5895         int i, err;
5896
5897         err = ipv6_addr_label_init();
5898         if (err < 0) {
5899                 pr_crit("%s: cannot initialize default policy table: %d\n",
5900                         __func__, err);
5901                 goto out;
5902         }
5903
5904         err = register_pernet_subsys(&addrconf_ops);
5905         if (err < 0)
5906                 goto out_addrlabel;
5907
5908         addrconf_wq = create_workqueue("ipv6_addrconf");
5909         if (!addrconf_wq) {
5910                 err = -ENOMEM;
5911                 goto out_nowq;
5912         }
5913
5914         /* The addrconf netdev notifier requires that loopback_dev
5915          * has it's ipv6 private information allocated and setup
5916          * before it can bring up and give link-local addresses
5917          * to other devices which are up.
5918          *
5919          * Unfortunately, loopback_dev is not necessarily the first
5920          * entry in the global dev_base list of net devices.  In fact,
5921          * it is likely to be the very last entry on that list.
5922          * So this causes the notifier registry below to try and
5923          * give link-local addresses to all devices besides loopback_dev
5924          * first, then loopback_dev, which cases all the non-loopback_dev
5925          * devices to fail to get a link-local address.
5926          *
5927          * So, as a temporary fix, allocate the ipv6 structure for
5928          * loopback_dev first by hand.
5929          * Longer term, all of the dependencies ipv6 has upon the loopback
5930          * device and it being up should be removed.
5931          */
5932         rtnl_lock();
5933         idev = ipv6_add_dev(init_net.loopback_dev);
5934         rtnl_unlock();
5935         if (IS_ERR(idev)) {
5936                 err = PTR_ERR(idev);
5937                 goto errlo;
5938         }
5939
5940         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5941                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5942
5943         register_netdevice_notifier(&ipv6_dev_notf);
5944
5945         addrconf_verify();
5946
5947         rtnl_af_register(&inet6_ops);
5948
5949         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5950                               NULL);
5951         if (err < 0)
5952                 goto errout;
5953
5954         /* Only the first call to __rtnl_register can fail */
5955         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5956         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5957         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5958                         inet6_dump_ifaddr, NULL);
5959         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5960                         inet6_dump_ifmcaddr, NULL);
5961         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5962                         inet6_dump_ifacaddr, NULL);
5963         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5964                         inet6_netconf_dump_devconf, NULL);
5965
5966         ipv6_addr_label_rtnl_register();
5967
5968         return 0;
5969 errout:
5970         rtnl_af_unregister(&inet6_ops);
5971         unregister_netdevice_notifier(&ipv6_dev_notf);
5972 errlo:
5973         destroy_workqueue(addrconf_wq);
5974 out_nowq:
5975         unregister_pernet_subsys(&addrconf_ops);
5976 out_addrlabel:
5977         ipv6_addr_label_cleanup();
5978 out:
5979         return err;
5980 }
5981
5982 void addrconf_cleanup(void)
5983 {
5984         struct net_device *dev;
5985         int i;
5986
5987         unregister_netdevice_notifier(&ipv6_dev_notf);
5988         unregister_pernet_subsys(&addrconf_ops);
5989         ipv6_addr_label_cleanup();
5990
5991         rtnl_lock();
5992
5993         __rtnl_af_unregister(&inet6_ops);
5994
5995         /* clean dev list */
5996         for_each_netdev(&init_net, dev) {
5997                 if (__in6_dev_get(dev) == NULL)
5998                         continue;
5999                 addrconf_ifdown(dev, 1);
6000         }
6001         addrconf_ifdown(init_net.loopback_dev, 2);
6002
6003         /*
6004          *      Check hash table.
6005          */
6006         spin_lock_bh(&addrconf_hash_lock);
6007         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6008                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6009         spin_unlock_bh(&addrconf_hash_lock);
6010         cancel_delayed_work(&addr_chk_work);
6011         rtnl_unlock();
6012
6013         destroy_workqueue(addrconf_wq);
6014 }