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         in6_ifa_hold(ifp);
 295         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 296                 in6_ifa_put(ifp);
 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;
 961         /* No need to add the TENTATIVE flag for addresses with NODAD */
 962         if (!(flags & IFA_F_NODAD))
 963                 ifa->flags |= IFA_F_TENTATIVE;
 964         ifa->valid_lft = valid_lft;
 965         ifa->prefered_lft = prefered_lft;
 966         ifa->cstamp = ifa->tstamp = jiffies;
 967         ifa->tokenized = false;
 968
 969         ifa->rt = rt;
 970
 971         ifa->idev = idev;
 972         in6_dev_hold(idev);
 973         /* For caller */
 974         in6_ifa_hold(ifa);
 975
 976         /* Add to big hash table */
 977         hash = inet6_addr_hash(addr);
 978
 979         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 980         spin_unlock(&addrconf_hash_lock);
 981
 982         write_lock(&idev->lock);
 983         /* Add to inet6_dev unicast addr list. */
 984         ipv6_link_dev_addr(idev, ifa);
 985
 986         if (ifa->flags&IFA_F_TEMPORARY) {
 987                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 988                 in6_ifa_hold(ifa);
 989         }
 990
 991         in6_ifa_hold(ifa);
 992         write_unlock(&idev->lock);
 993 out2:
 994         rcu_read_unlock_bh();
 995
 996         if (likely(err == 0))
 997                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 998         else {
 999                 kfree(ifa);
1000                 ifa = ERR_PTR(err);
1001         }
1002
1003         return ifa;
1004 out:
1005         spin_unlock(&addrconf_hash_lock);
1006         goto out2;
1007 }
1008
1009 enum cleanup_prefix_rt_t {
1010         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1011         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1012         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1013 };
1014
1015 /*
1016  * Check, whether the prefix for ifp would still need a prefix route
1017  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1018  * constants.
1019  *
1020  * 1) we don't purge prefix if address was not permanent.
1021  *    prefix is managed by its own lifetime.
1022  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1023  * 3) if there are no addresses, delete prefix.
1024  * 4) if there are still other permanent address(es),
1025  *    corresponding prefix is still permanent.
1026  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1027  *    don't purge the prefix, assume user space is managing it.
1028  * 6) otherwise, update prefix lifetime to the
1029  *    longest valid lifetime among the corresponding
1030  *    addresses on the device.
1031  *    Note: subsequent RA will update lifetime.
1032  **/
1033 static enum cleanup_prefix_rt_t
1034 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1035 {
1036         struct inet6_ifaddr *ifa;
1037         struct inet6_dev *idev = ifp->idev;
1038         unsigned long lifetime;
1039         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1040
1041         *expires = jiffies;
1042
1043         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1044                 if (ifa == ifp)
1045                         continue;
1046                 if (ifa->prefix_len != ifp->prefix_len ||
1047                     !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1048                                        ifp->prefix_len))
1049                         continue;
1050                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1051                         return CLEANUP_PREFIX_RT_NOP;
1052
1053                 action = CLEANUP_PREFIX_RT_EXPIRE;
1054
1055                 spin_lock(&ifa->lock);
1056
1057                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1058                 /*
1059                  * Note: Because this address is
1060                  * not permanent, lifetime <
1061                  * LONG_MAX / HZ here.
1062                  */
1063                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1064                         *expires = ifa->tstamp + lifetime * HZ;
1065                 spin_unlock(&ifa->lock);
1066         }
1067
1068         return action;
1069 }
1070
1071 static void
1072 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1073 {
1074         struct rt6_info *rt;
1075
1076         rt = addrconf_get_prefix_route(&ifp->addr,
1077                                        ifp->prefix_len,
1078                                        ifp->idev->dev,
1079                                        0, RTF_GATEWAY | RTF_DEFAULT);
1080         if (rt) {
1081                 if (del_rt)
1082                         ip6_del_rt(rt);
1083                 else {
1084                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1085                                 rt6_set_expires(rt, expires);
1086                         ip6_rt_put(rt);
1087                 }
1088         }
1089 }
1090
1091
1092 /* This function wants to get referenced ifp and releases it before return */
1093
1094 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1095 {
1096         int state;
1097         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1098         unsigned long expires;
1099
1100         ASSERT_RTNL();
1101
1102         spin_lock_bh(&ifp->lock);
1103         state = ifp->state;
1104         ifp->state = INET6_IFADDR_STATE_DEAD;
1105         spin_unlock_bh(&ifp->lock);
1106
1107         if (state == INET6_IFADDR_STATE_DEAD)
1108                 goto out;
1109
1110         spin_lock_bh(&addrconf_hash_lock);
1111         hlist_del_init_rcu(&ifp->addr_lst);
1112         spin_unlock_bh(&addrconf_hash_lock);
1113
1114         write_lock_bh(&ifp->idev->lock);
1115
1116         if (ifp->flags&IFA_F_TEMPORARY) {
1117                 list_del(&ifp->tmp_list);
1118                 if (ifp->ifpub) {
1119                         in6_ifa_put(ifp->ifpub);
1120                         ifp->ifpub = NULL;
1121                 }
1122                 __in6_ifa_put(ifp);
1123         }
1124
1125         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1126                 action = check_cleanup_prefix_route(ifp, &expires);
1127
1128         list_del_init(&ifp->if_list);
1129         __in6_ifa_put(ifp);
1130
1131         write_unlock_bh(&ifp->idev->lock);
1132
1133         addrconf_del_dad_work(ifp);
1134
1135         ipv6_ifa_notify(RTM_DELADDR, ifp);
1136
1137         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1138
1139         if (action != CLEANUP_PREFIX_RT_NOP) {
1140                 cleanup_prefix_route(ifp, expires,
1141                         action == CLEANUP_PREFIX_RT_DEL);
1142         }
1143
1144         /* clean up prefsrc entries */
1145         rt6_remove_prefsrc(ifp);
1146 out:
1147         in6_ifa_put(ifp);
1148 }
1149
1150 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1151 {
1152         struct inet6_dev *idev = ifp->idev;
1153         struct in6_addr addr, *tmpaddr;
1154         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1155         unsigned long regen_advance;
1156         int tmp_plen;
1157         int ret = 0;
1158         u32 addr_flags;
1159         unsigned long now = jiffies;
1160
1161         write_lock_bh(&idev->lock);
1162         if (ift) {
1163                 spin_lock_bh(&ift->lock);
1164                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1165                 spin_unlock_bh(&ift->lock);
1166                 tmpaddr = &addr;
1167         } else {
1168                 tmpaddr = NULL;
1169         }
1170 retry:
1171         in6_dev_hold(idev);
1172         if (idev->cnf.use_tempaddr <= 0) {
1173                 write_unlock_bh(&idev->lock);
1174                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1175                 in6_dev_put(idev);
1176                 ret = -1;
1177                 goto out;
1178         }
1179         spin_lock_bh(&ifp->lock);
1180         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1181                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1182                 spin_unlock_bh(&ifp->lock);
1183                 write_unlock_bh(&idev->lock);
1184                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1185                         __func__);
1186                 in6_dev_put(idev);
1187                 ret = -1;
1188                 goto out;
1189         }
1190         in6_ifa_hold(ifp);
1191         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1192         __ipv6_try_regen_rndid(idev, tmpaddr);
1193         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1194         age = (now - ifp->tstamp) / HZ;
1195         tmp_valid_lft = min_t(__u32,
1196                               ifp->valid_lft,
1197                               idev->cnf.temp_valid_lft + age);
1198         tmp_prefered_lft = min_t(__u32,
1199                                  ifp->prefered_lft,
1200                                  idev->cnf.temp_prefered_lft + age -
1201                                  idev->cnf.max_desync_factor);
1202         tmp_plen = ifp->prefix_len;
1203         tmp_tstamp = ifp->tstamp;
1204         spin_unlock_bh(&ifp->lock);
1205
1206         regen_advance = idev->cnf.regen_max_retry *
1207                         idev->cnf.dad_transmits *
1208                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1209         write_unlock_bh(&idev->lock);
1210
1211         /* A temporary address is created only if this calculated Preferred
1212          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1213          * an implementation must not create a temporary address with a zero
1214          * Preferred Lifetime.
1215          * Use age calculation as in addrconf_verify to avoid unnecessary
1216          * temporary addresses being generated.
1217          */
1218         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1219         if (tmp_prefered_lft <= regen_advance + age) {
1220                 in6_ifa_put(ifp);
1221                 in6_dev_put(idev);
1222                 ret = -1;
1223                 goto out;
1224         }
1225
1226         addr_flags = IFA_F_TEMPORARY;
1227         /* set in addrconf_prefix_rcv() */
1228         if (ifp->flags & IFA_F_OPTIMISTIC)
1229                 addr_flags |= IFA_F_OPTIMISTIC;
1230
1231         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1232                             ipv6_addr_scope(&addr), addr_flags,
1233                             tmp_valid_lft, tmp_prefered_lft);
1234         if (IS_ERR(ift)) {
1235                 in6_ifa_put(ifp);
1236                 in6_dev_put(idev);
1237                 pr_info("%s: retry temporary address regeneration\n", __func__);
1238                 tmpaddr = &addr;
1239                 write_lock_bh(&idev->lock);
1240                 goto retry;
1241         }
1242
1243         spin_lock_bh(&ift->lock);
1244         ift->ifpub = ifp;
1245         ift->cstamp = now;
1246         ift->tstamp = tmp_tstamp;
1247         spin_unlock_bh(&ift->lock);
1248
1249         addrconf_dad_start(ift);
1250         in6_ifa_put(ift);
1251         in6_dev_put(idev);
1252 out:
1253         return ret;
1254 }
1255
1256 /*
1257  *      Choose an appropriate source address (RFC3484)
1258  */
1259 enum {
1260         IPV6_SADDR_RULE_INIT = 0,
1261         IPV6_SADDR_RULE_LOCAL,
1262         IPV6_SADDR_RULE_SCOPE,
1263         IPV6_SADDR_RULE_PREFERRED,
1264 #ifdef CONFIG_IPV6_MIP6
1265         IPV6_SADDR_RULE_HOA,
1266 #endif
1267         IPV6_SADDR_RULE_OIF,
1268         IPV6_SADDR_RULE_LABEL,
1269         IPV6_SADDR_RULE_PRIVACY,
1270         IPV6_SADDR_RULE_ORCHID,
1271         IPV6_SADDR_RULE_PREFIX,
1272 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1273         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1274 #endif
1275         IPV6_SADDR_RULE_MAX
1276 };
1277
1278 struct ipv6_saddr_score {
1279         int                     rule;
1280         int                     addr_type;
1281         struct inet6_ifaddr     *ifa;
1282         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1283         int                     scopedist;
1284         int                     matchlen;
1285 };
1286
1287 struct ipv6_saddr_dst {
1288         const struct in6_addr *addr;
1289         int ifindex;
1290         int scope;
1291         int label;
1292         unsigned int prefs;
1293 };
1294
1295 static inline int ipv6_saddr_preferred(int type)
1296 {
1297         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1298                 return 1;
1299         return 0;
1300 }
1301
1302 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1303 {
1304 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1305         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1306 #else
1307         return false;
1308 #endif
1309 }
1310
1311 static int ipv6_get_saddr_eval(struct net *net,
1312                                struct ipv6_saddr_score *score,
1313                                struct ipv6_saddr_dst *dst,
1314                                int i)
1315 {
1316         int ret;
1317
1318         if (i <= score->rule) {
1319                 switch (i) {
1320                 case IPV6_SADDR_RULE_SCOPE:
1321                         ret = score->scopedist;
1322                         break;
1323                 case IPV6_SADDR_RULE_PREFIX:
1324                         ret = score->matchlen;
1325                         break;
1326                 default:
1327                         ret = !!test_bit(i, score->scorebits);
1328                 }
1329                 goto out;
1330         }
1331
1332         switch (i) {
1333         case IPV6_SADDR_RULE_INIT:
1334                 /* Rule 0: remember if hiscore is not ready yet */
1335                 ret = !!score->ifa;
1336                 break;
1337         case IPV6_SADDR_RULE_LOCAL:
1338                 /* Rule 1: Prefer same address */
1339                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1340                 break;
1341         case IPV6_SADDR_RULE_SCOPE:
1342                 /* Rule 2: Prefer appropriate scope
1343                  *
1344                  *      ret
1345                  *       ^
1346                  *    -1 |  d 15
1347                  *    ---+--+-+---> scope
1348                  *       |
1349                  *       |             d is scope of the destination.
1350                  *  B-d  |  \
1351                  *       |   \      <- smaller scope is better if
1352                  *  B-15 |    \        if scope is enough for destination.
1353                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1354                  * d-C-1 | /
1355                  *       |/         <- greater is better
1356                  *   -C  /             if scope is not enough for destination.
1357                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1358                  *
1359                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1360                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1361                  * Assume B = 0 and we get C > 29.
1362                  */
1363                 ret = __ipv6_addr_src_scope(score->addr_type);
1364                 if (ret >= dst->scope)
1365                         ret = -ret;
1366                 else
1367                         ret -= 128;     /* 30 is enough */
1368                 score->scopedist = ret;
1369                 break;
1370         case IPV6_SADDR_RULE_PREFERRED:
1371             {
1372                 /* Rule 3: Avoid deprecated and optimistic addresses */
1373                 u8 avoid = IFA_F_DEPRECATED;
1374
1375                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1376                         avoid |= IFA_F_OPTIMISTIC;
1377                 ret = ipv6_saddr_preferred(score->addr_type) ||
1378                       !(score->ifa->flags & avoid);
1379                 break;
1380             }
1381 #ifdef CONFIG_IPV6_MIP6
1382         case IPV6_SADDR_RULE_HOA:
1383             {
1384                 /* Rule 4: Prefer home address */
1385                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1386                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1387                 break;
1388             }
1389 #endif
1390         case IPV6_SADDR_RULE_OIF:
1391                 /* Rule 5: Prefer outgoing interface */
1392                 ret = (!dst->ifindex ||
1393                        dst->ifindex == score->ifa->idev->dev->ifindex);
1394                 break;
1395         case IPV6_SADDR_RULE_LABEL:
1396                 /* Rule 6: Prefer matching label */
1397                 ret = ipv6_addr_label(net,
1398                                       &score->ifa->addr, score->addr_type,
1399                                       score->ifa->idev->dev->ifindex) == dst->label;
1400                 break;
1401         case IPV6_SADDR_RULE_PRIVACY:
1402             {
1403                 /* Rule 7: Prefer public address
1404                  * Note: prefer temporary address if use_tempaddr >= 2
1405                  */
1406                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1407                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1408                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1409                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1410                 break;
1411             }
1412         case IPV6_SADDR_RULE_ORCHID:
1413                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1414                  *          non-ORCHID vs non-ORCHID
1415                  */
1416                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1417                         ipv6_addr_orchid(dst->addr));
1418                 break;
1419         case IPV6_SADDR_RULE_PREFIX:
1420                 /* Rule 8: Use longest matching prefix */
1421                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1422                 if (ret > score->ifa->prefix_len)
1423                         ret = score->ifa->prefix_len;
1424                 score->matchlen = ret;
1425                 break;
1426 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1427         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1428                 /* Optimistic addresses still have lower precedence than other
1429                  * preferred addresses.
1430                  */
1431                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1432                 break;
1433 #endif
1434         default:
1435                 ret = 0;
1436         }
1437
1438         if (ret)
1439                 __set_bit(i, score->scorebits);
1440         score->rule = i;
1441 out:
1442         return ret;
1443 }
1444
1445 static int __ipv6_dev_get_saddr(struct net *net,
1446                                 struct ipv6_saddr_dst *dst,
1447                                 struct inet6_dev *idev,
1448                                 struct ipv6_saddr_score *scores,
1449                                 int hiscore_idx)
1450 {
1451         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1452
1453         read_lock_bh(&idev->lock);
1454         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1455                 int i;
1456
1457                 /*
1458                  * - Tentative Address (RFC2462 section 5.4)
1459                  *  - A tentative address is not considered
1460                  *    "assigned to an interface" in the traditional
1461                  *    sense, unless it is also flagged as optimistic.
1462                  * - Candidate Source Address (section 4)
1463                  *  - In any case, anycast addresses, multicast
1464                  *    addresses, and the unspecified address MUST
1465                  *    NOT be included in a candidate set.
1466                  */
1467                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1468                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1469                         continue;
1470
1471                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1472
1473                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1474                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1475                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1476                                             idev->dev->name);
1477                         continue;
1478                 }
1479
1480                 score->rule = -1;
1481                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1482
1483                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1484                         int minihiscore, miniscore;
1485
1486                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1487                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1488
1489                         if (minihiscore > miniscore) {
1490                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1491                                     score->scopedist > 0) {
1492                                         /*
1493                                          * special case:
1494                                          * each remaining entry
1495                                          * has too small (not enough)
1496                                          * scope, because ifa entries
1497                                          * are sorted by their scope
1498                                          * values.
1499                                          */
1500                                         goto out;
1501                                 }
1502                                 break;
1503                         } else if (minihiscore < miniscore) {
1504                                 if (hiscore->ifa)
1505                                         in6_ifa_put(hiscore->ifa);
1506
1507                                 in6_ifa_hold(score->ifa);
1508
1509                                 swap(hiscore, score);
1510                                 hiscore_idx = 1 - hiscore_idx;
1511
1512                                 /* restore our iterator */
1513                                 score->ifa = hiscore->ifa;
1514
1515                                 break;
1516                         }
1517                 }
1518         }
1519 out:
1520         read_unlock_bh(&idev->lock);
1521         return hiscore_idx;
1522 }
1523
1524 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1525                        const struct in6_addr *daddr, unsigned int prefs,
1526                        struct in6_addr *saddr)
1527 {
1528         struct ipv6_saddr_score scores[2], *hiscore;
1529         struct ipv6_saddr_dst dst;
1530         struct inet6_dev *idev;
1531         struct net_device *dev;
1532         int dst_type;
1533         bool use_oif_addr = false;
1534         int hiscore_idx = 0;
1535
1536         dst_type = __ipv6_addr_type(daddr);
1537         dst.addr = daddr;
1538         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1539         dst.scope = __ipv6_addr_src_scope(dst_type);
1540         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1541         dst.prefs = prefs;
1542
1543         scores[hiscore_idx].rule = -1;
1544         scores[hiscore_idx].ifa = NULL;
1545
1546         rcu_read_lock();
1547
1548         /* Candidate Source Address (section 4)
1549          *  - multicast and link-local destination address,
1550          *    the set of candidate source address MUST only
1551          *    include addresses assigned to interfaces
1552          *    belonging to the same link as the outgoing
1553          *    interface.
1554          * (- For site-local destination addresses, the
1555          *    set of candidate source addresses MUST only
1556          *    include addresses assigned to interfaces
1557          *    belonging to the same site as the outgoing
1558          *    interface.)
1559          *  - "It is RECOMMENDED that the candidate source addresses
1560          *    be the set of unicast addresses assigned to the
1561          *    interface that will be used to send to the destination
1562          *    (the 'outgoing' interface)." (RFC 6724)
1563          */
1564         if (dst_dev) {
1565                 idev = __in6_dev_get(dst_dev);
1566                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1567                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1568                     (idev && idev->cnf.use_oif_addrs_only)) {
1569                         use_oif_addr = true;
1570                 }
1571         }
1572
1573         if (use_oif_addr) {
1574                 if (idev)
1575                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1576         } else {
1577                 for_each_netdev_rcu(net, dev) {
1578                         idev = __in6_dev_get(dev);
1579                         if (!idev)
1580                                 continue;
1581                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1582                 }
1583         }
1584         rcu_read_unlock();
1585
1586         hiscore = &scores[hiscore_idx];
1587         if (!hiscore->ifa)
1588                 return -EADDRNOTAVAIL;
1589
1590         *saddr = hiscore->ifa->addr;
1591         in6_ifa_put(hiscore->ifa);
1592         return 0;
1593 }
1594 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1595
1596 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1597                       u32 banned_flags)
1598 {
1599         struct inet6_ifaddr *ifp;
1600         int err = -EADDRNOTAVAIL;
1601
1602         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1603                 if (ifp->scope > IFA_LINK)
1604                         break;
1605                 if (ifp->scope == IFA_LINK &&
1606                     !(ifp->flags & banned_flags)) {
1607                         *addr = ifp->addr;
1608                         err = 0;
1609                         break;
1610                 }
1611         }
1612         return err;
1613 }
1614
1615 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1616                     u32 banned_flags)
1617 {
1618         struct inet6_dev *idev;
1619         int err = -EADDRNOTAVAIL;
1620
1621         rcu_read_lock();
1622         idev = __in6_dev_get(dev);
1623         if (idev) {
1624                 read_lock_bh(&idev->lock);
1625                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1626                 read_unlock_bh(&idev->lock);
1627         }
1628         rcu_read_unlock();
1629         return err;
1630 }
1631
1632 static int ipv6_count_addresses(struct inet6_dev *idev)
1633 {
1634         int cnt = 0;
1635         struct inet6_ifaddr *ifp;
1636
1637         read_lock_bh(&idev->lock);
1638         list_for_each_entry(ifp, &idev->addr_list, if_list)
1639                 cnt++;
1640         read_unlock_bh(&idev->lock);
1641         return cnt;
1642 }
1643
1644 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1645                   const struct net_device *dev, int strict)
1646 {
1647         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1648 }
1649 EXPORT_SYMBOL(ipv6_chk_addr);
1650
1651 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1652                             const struct net_device *dev, int strict,
1653                             u32 banned_flags)
1654 {
1655         struct inet6_ifaddr *ifp;
1656         unsigned int hash = inet6_addr_hash(addr);
1657         u32 ifp_flags;
1658
1659         rcu_read_lock_bh();
1660         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1661                 if (!net_eq(dev_net(ifp->idev->dev), net))
1662                         continue;
1663                 /* Decouple optimistic from tentative for evaluation here.
1664                  * Ban optimistic addresses explicitly, when required.
1665                  */
1666                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1667                             ? (ifp->flags&~IFA_F_TENTATIVE)
1668                             : ifp->flags;
1669                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1670                     !(ifp_flags&banned_flags) &&
1671                     (!dev || ifp->idev->dev == dev ||
1672                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1673                         rcu_read_unlock_bh();
1674                         return 1;
1675                 }
1676         }
1677
1678         rcu_read_unlock_bh();
1679         return 0;
1680 }
1681 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1682
1683 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1684                                struct net_device *dev)
1685 {
1686         unsigned int hash = inet6_addr_hash(addr);
1687         struct inet6_ifaddr *ifp;
1688
1689         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1690                 if (!net_eq(dev_net(ifp->idev->dev), net))
1691                         continue;
1692                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1693                         if (!dev || ifp->idev->dev == dev)
1694                                 return true;
1695                 }
1696         }
1697         return false;
1698 }
1699
1700 /* Compares an address/prefix_len with addresses on device @dev.
1701  * If one is found it returns true.
1702  */
1703 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1704         const unsigned int prefix_len, struct net_device *dev)
1705 {
1706         struct inet6_dev *idev;
1707         struct inet6_ifaddr *ifa;
1708         bool ret = false;
1709
1710         rcu_read_lock();
1711         idev = __in6_dev_get(dev);
1712         if (idev) {
1713                 read_lock_bh(&idev->lock);
1714                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1715                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1716                         if (ret)
1717                                 break;
1718                 }
1719                 read_unlock_bh(&idev->lock);
1720         }
1721         rcu_read_unlock();
1722
1723         return ret;
1724 }
1725 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1726
1727 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1728 {
1729         struct inet6_dev *idev;
1730         struct inet6_ifaddr *ifa;
1731         int     onlink;
1732
1733         onlink = 0;
1734         rcu_read_lock();
1735         idev = __in6_dev_get(dev);
1736         if (idev) {
1737                 read_lock_bh(&idev->lock);
1738                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1739                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1740                                                    ifa->prefix_len);
1741                         if (onlink)
1742                                 break;
1743                 }
1744                 read_unlock_bh(&idev->lock);
1745         }
1746         rcu_read_unlock();
1747         return onlink;
1748 }
1749 EXPORT_SYMBOL(ipv6_chk_prefix);
1750
1751 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1752                                      struct net_device *dev, int strict)
1753 {
1754         struct inet6_ifaddr *ifp, *result = NULL;
1755         unsigned int hash = inet6_addr_hash(addr);
1756
1757         rcu_read_lock_bh();
1758         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1759                 if (!net_eq(dev_net(ifp->idev->dev), net))
1760                         continue;
1761                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1762                         if (!dev || ifp->idev->dev == dev ||
1763                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1764                                 result = ifp;
1765                                 in6_ifa_hold(ifp);
1766                                 break;
1767                         }
1768                 }
1769         }
1770         rcu_read_unlock_bh();
1771
1772         return result;
1773 }
1774
1775 /* Gets referenced address, destroys ifaddr */
1776
1777 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1778 {
1779         if (ifp->flags&IFA_F_TEMPORARY) {
1780                 struct inet6_ifaddr *ifpub;
1781                 spin_lock_bh(&ifp->lock);
1782                 ifpub = ifp->ifpub;
1783                 if (ifpub) {
1784                         in6_ifa_hold(ifpub);
1785                         spin_unlock_bh(&ifp->lock);
1786                         ipv6_create_tempaddr(ifpub, ifp);
1787                         in6_ifa_put(ifpub);
1788                 } else {
1789                         spin_unlock_bh(&ifp->lock);
1790                 }
1791                 ipv6_del_addr(ifp);
1792         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1793                 spin_lock_bh(&ifp->lock);
1794                 addrconf_del_dad_work(ifp);
1795                 ifp->flags |= IFA_F_TENTATIVE;
1796                 if (dad_failed)
1797                         ifp->flags |= IFA_F_DADFAILED;
1798                 spin_unlock_bh(&ifp->lock);
1799                 if (dad_failed)
1800                         ipv6_ifa_notify(0, ifp);
1801                 in6_ifa_put(ifp);
1802         } else {
1803                 ipv6_del_addr(ifp);
1804         }
1805 }
1806
1807 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1808 {
1809         int err = -ENOENT;
1810
1811         spin_lock_bh(&ifp->lock);
1812         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1813                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1814                 err = 0;
1815         }
1816         spin_unlock_bh(&ifp->lock);
1817
1818         return err;
1819 }
1820
1821 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1822 {
1823         struct in6_addr addr;
1824         struct inet6_dev *idev = ifp->idev;
1825         struct net *net = dev_net(ifp->idev->dev);
1826
1827         if (addrconf_dad_end(ifp)) {
1828                 in6_ifa_put(ifp);
1829                 return;
1830         }
1831
1832         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1833                              ifp->idev->dev->name, &ifp->addr);
1834
1835         spin_lock_bh(&ifp->lock);
1836
1837         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1838                 int scope = ifp->scope;
1839                 u32 flags = ifp->flags;
1840                 struct in6_addr new_addr;
1841                 struct inet6_ifaddr *ifp2;
1842                 u32 valid_lft, preferred_lft;
1843                 int pfxlen = ifp->prefix_len;
1844                 int retries = ifp->stable_privacy_retry + 1;
1845
1846                 if (retries > net->ipv6.sysctl.idgen_retries) {
1847                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1848                                              ifp->idev->dev->name);
1849                         goto errdad;
1850                 }
1851
1852                 new_addr = ifp->addr;
1853                 if (ipv6_generate_stable_address(&new_addr, retries,
1854                                                  idev))
1855                         goto errdad;
1856
1857                 valid_lft = ifp->valid_lft;
1858                 preferred_lft = ifp->prefered_lft;
1859
1860                 spin_unlock_bh(&ifp->lock);
1861
1862                 if (idev->cnf.max_addresses &&
1863                     ipv6_count_addresses(idev) >=
1864                     idev->cnf.max_addresses)
1865                         goto lock_errdad;
1866
1867                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1868                                      ifp->idev->dev->name);
1869
1870                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1871                                      scope, flags, valid_lft,
1872                                      preferred_lft);
1873                 if (IS_ERR(ifp2))
1874                         goto lock_errdad;
1875
1876                 spin_lock_bh(&ifp2->lock);
1877                 ifp2->stable_privacy_retry = retries;
1878                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1879                 spin_unlock_bh(&ifp2->lock);
1880
1881                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1882                 in6_ifa_put(ifp2);
1883 lock_errdad:
1884                 spin_lock_bh(&ifp->lock);
1885         } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1886                 addr.s6_addr32[0] = htonl(0xfe800000);
1887                 addr.s6_addr32[1] = 0;
1888
1889                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1890                     ipv6_addr_equal(&ifp->addr, &addr)) {
1891                         /* DAD failed for link-local based on MAC address */
1892                         idev->cnf.disable_ipv6 = 1;
1893
1894                         pr_info("%s: IPv6 being disabled!\n",
1895                                 ifp->idev->dev->name);
1896                 }
1897         }
1898
1899 errdad:
1900         /* transition from _POSTDAD to _ERRDAD */
1901         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1902         spin_unlock_bh(&ifp->lock);
1903
1904         addrconf_mod_dad_work(ifp, 0);
1905         in6_ifa_put(ifp);
1906 }
1907
1908 /* Join to solicited addr multicast group.
1909  * caller must hold RTNL */
1910 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1911 {
1912         struct in6_addr maddr;
1913
1914         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1915                 return;
1916
1917         addrconf_addr_solict_mult(addr, &maddr);
1918         ipv6_dev_mc_inc(dev, &maddr);
1919 }
1920
1921 /* caller must hold RTNL */
1922 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1923 {
1924         struct in6_addr maddr;
1925
1926         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1927                 return;
1928
1929         addrconf_addr_solict_mult(addr, &maddr);
1930         __ipv6_dev_mc_dec(idev, &maddr);
1931 }
1932
1933 /* caller must hold RTNL */
1934 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1935 {
1936         struct in6_addr addr;
1937
1938         if (ifp->prefix_len >= 127) /* RFC 6164 */
1939                 return;
1940         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1941         if (ipv6_addr_any(&addr))
1942                 return;
1943         __ipv6_dev_ac_inc(ifp->idev, &addr);
1944 }
1945
1946 /* caller must hold RTNL */
1947 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1948 {
1949         struct in6_addr addr;
1950
1951         if (ifp->prefix_len >= 127) /* RFC 6164 */
1952                 return;
1953         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1954         if (ipv6_addr_any(&addr))
1955                 return;
1956         __ipv6_dev_ac_dec(ifp->idev, &addr);
1957 }
1958
1959 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1960 {
1961         if (dev->addr_len != IEEE802154_ADDR_LEN)
1962                 return -1;
1963         memcpy(eui, dev->dev_addr, 8);
1964         eui[0] ^= 2;
1965         return 0;
1966 }
1967
1968 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1969 {
1970         union fwnet_hwaddr *ha;
1971
1972         if (dev->addr_len != FWNET_ALEN)
1973                 return -1;
1974
1975         ha = (union fwnet_hwaddr *)dev->dev_addr;
1976
1977         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1978         eui[0] ^= 2;
1979         return 0;
1980 }
1981
1982 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1983 {
1984         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1985         if (dev->addr_len != ARCNET_ALEN)
1986                 return -1;
1987         memset(eui, 0, 7);
1988         eui[7] = *(u8 *)dev->dev_addr;
1989         return 0;
1990 }
1991
1992 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1993 {
1994         if (dev->addr_len != INFINIBAND_ALEN)
1995                 return -1;
1996         memcpy(eui, dev->dev_addr + 12, 8);
1997         eui[0] |= 2;
1998         return 0;
1999 }
2000
2001 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2002 {
2003         if (addr == 0)
2004                 return -1;
2005         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2006                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2007                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2008                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2009                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2010                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2011         eui[1] = 0;
2012         eui[2] = 0x5E;
2013         eui[3] = 0xFE;
2014         memcpy(eui + 4, &addr, 4);
2015         return 0;
2016 }
2017
2018 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2019 {
2020         if (dev->priv_flags & IFF_ISATAP)
2021                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2022         return -1;
2023 }
2024
2025 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2026 {
2027         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2028 }
2029
2030 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2031 {
2032         memcpy(eui, dev->perm_addr, 3);
2033         memcpy(eui + 5, dev->perm_addr + 3, 3);
2034         eui[3] = 0xFF;
2035         eui[4] = 0xFE;
2036         eui[0] ^= 2;
2037         return 0;
2038 }
2039
2040 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2041 {
2042         switch (dev->type) {
2043         case ARPHRD_ETHER:
2044         case ARPHRD_FDDI:
2045                 return addrconf_ifid_eui48(eui, dev);
2046         case ARPHRD_ARCNET:
2047                 return addrconf_ifid_arcnet(eui, dev);
2048         case ARPHRD_INFINIBAND:
2049                 return addrconf_ifid_infiniband(eui, dev);
2050         case ARPHRD_SIT:
2051                 return addrconf_ifid_sit(eui, dev);
2052         case ARPHRD_IPGRE:
2053                 return addrconf_ifid_gre(eui, dev);
2054         case ARPHRD_6LOWPAN:
2055         case ARPHRD_IEEE802154:
2056                 return addrconf_ifid_eui64(eui, dev);
2057         case ARPHRD_IEEE1394:
2058                 return addrconf_ifid_ieee1394(eui, dev);
2059         case ARPHRD_TUNNEL6:
2060                 return addrconf_ifid_ip6tnl(eui, dev);
2061         }
2062         return -1;
2063 }
2064
2065 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2066 {
2067         int err = -1;
2068         struct inet6_ifaddr *ifp;
2069
2070         read_lock_bh(&idev->lock);
2071         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2072                 if (ifp->scope > IFA_LINK)
2073                         break;
2074                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2075                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2076                         err = 0;
2077                         break;
2078                 }
2079         }
2080         read_unlock_bh(&idev->lock);
2081         return err;
2082 }
2083
2084 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2085 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2086 {
2087 regen:
2088         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2089         idev->rndid[0] &= ~0x02;
2090
2091         /*
2092          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2093          * check if generated address is not inappropriate
2094          *
2095          *  - Reserved subnet anycast (RFC 2526)
2096          *      11111101 11....11 1xxxxxxx
2097          *  - ISATAP (RFC4214) 6.1
2098          *      00-00-5E-FE-xx-xx-xx-xx
2099          *  - value 0
2100          *  - XXX: already assigned to an address on the device
2101          */
2102         if (idev->rndid[0] == 0xfd &&
2103             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2104             (idev->rndid[7]&0x80))
2105                 goto regen;
2106         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2107                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2108                         goto regen;
2109                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2110                         goto regen;
2111         }
2112 }
2113
2114 static void ipv6_regen_rndid(unsigned long data)
2115 {
2116         struct inet6_dev *idev = (struct inet6_dev *) data;
2117         unsigned long expires;
2118
2119         rcu_read_lock_bh();
2120         write_lock_bh(&idev->lock);
2121
2122         if (idev->dead)
2123                 goto out;
2124
2125         __ipv6_regen_rndid(idev);
2126
2127         expires = jiffies +
2128                 idev->cnf.temp_prefered_lft * HZ -
2129                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2130                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2131                 idev->cnf.max_desync_factor * HZ;
2132         if (time_before(expires, jiffies)) {
2133                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2134                         __func__, idev->dev->name);
2135                 goto out;
2136         }
2137
2138         if (!mod_timer(&idev->regen_timer, expires))
2139                 in6_dev_hold(idev);
2140
2141 out:
2142         write_unlock_bh(&idev->lock);
2143         rcu_read_unlock_bh();
2144         in6_dev_put(idev);
2145 }
2146
2147 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2148 {
2149         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2150                 __ipv6_regen_rndid(idev);
2151 }
2152
2153 /*
2154  *      Add prefix route.
2155  */
2156
2157 static void
2158 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2159                       unsigned long expires, u32 flags)
2160 {
2161         struct fib6_config cfg = {
2162                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2163                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2164                 .fc_ifindex = dev->ifindex,
2165                 .fc_expires = expires,
2166                 .fc_dst_len = plen,
2167                 .fc_flags = RTF_UP | flags,
2168                 .fc_nlinfo.nl_net = dev_net(dev),
2169                 .fc_protocol = RTPROT_KERNEL,
2170         };
2171
2172         cfg.fc_dst = *pfx;
2173
2174         /* Prevent useless cloning on PtP SIT.
2175            This thing is done here expecting that the whole
2176            class of non-broadcast devices need not cloning.
2177          */
2178 #if IS_ENABLED(CONFIG_IPV6_SIT)
2179         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2180                 cfg.fc_flags |= RTF_NONEXTHOP;
2181 #endif
2182
2183         ip6_route_add(&cfg);
2184 }
2185
2186
2187 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2188                                                   int plen,
2189                                                   const struct net_device *dev,
2190                                                   u32 flags, u32 noflags)
2191 {
2192         struct fib6_node *fn;
2193         struct rt6_info *rt = NULL;
2194         struct fib6_table *table;
2195         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2196
2197         table = fib6_get_table(dev_net(dev), tb_id);
2198         if (!table)
2199                 return NULL;
2200
2201         read_lock_bh(&table->tb6_lock);
2202         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2203         if (!fn)
2204                 goto out;
2205
2206         noflags |= RTF_CACHE;
2207         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2208                 if (rt->dst.dev->ifindex != dev->ifindex)
2209                         continue;
2210                 if ((rt->rt6i_flags & flags) != flags)
2211                         continue;
2212                 if ((rt->rt6i_flags & noflags) != 0)
2213                         continue;
2214                 dst_hold(&rt->dst);
2215                 break;
2216         }
2217 out:
2218         read_unlock_bh(&table->tb6_lock);
2219         return rt;
2220 }
2221
2222
2223 /* Create "default" multicast route to the interface */
2224
2225 static void addrconf_add_mroute(struct net_device *dev)
2226 {
2227         struct fib6_config cfg = {
2228                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2229                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2230                 .fc_ifindex = dev->ifindex,
2231                 .fc_dst_len = 8,
2232                 .fc_flags = RTF_UP,
2233                 .fc_nlinfo.nl_net = dev_net(dev),
2234         };
2235
2236         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2237
2238         ip6_route_add(&cfg);
2239 }
2240
2241 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2242 {
2243         struct inet6_dev *idev;
2244
2245         ASSERT_RTNL();
2246
2247         idev = ipv6_find_idev(dev);
2248         if (!idev)
2249                 return ERR_PTR(-ENOBUFS);
2250
2251         if (idev->cnf.disable_ipv6)
2252                 return ERR_PTR(-EACCES);
2253
2254         /* Add default multicast route */
2255         if (!(dev->flags & IFF_LOOPBACK))
2256                 addrconf_add_mroute(dev);
2257
2258         return idev;
2259 }
2260
2261 static void manage_tempaddrs(struct inet6_dev *idev,
2262                              struct inet6_ifaddr *ifp,
2263                              __u32 valid_lft, __u32 prefered_lft,
2264                              bool create, unsigned long now)
2265 {
2266         u32 flags;
2267         struct inet6_ifaddr *ift;
2268
2269         read_lock_bh(&idev->lock);
2270         /* update all temporary addresses in the list */
2271         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2272                 int age, max_valid, max_prefered;
2273
2274                 if (ifp != ift->ifpub)
2275                         continue;
2276
2277                 /* RFC 4941 section 3.3:
2278                  * If a received option will extend the lifetime of a public
2279                  * address, the lifetimes of temporary addresses should
2280                  * be extended, subject to the overall constraint that no
2281                  * temporary addresses should ever remain "valid" or "preferred"
2282                  * for a time longer than (TEMP_VALID_LIFETIME) or
2283                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2284                  */
2285                 age = (now - ift->cstamp) / HZ;
2286                 max_valid = idev->cnf.temp_valid_lft - age;
2287                 if (max_valid < 0)
2288                         max_valid = 0;
2289
2290                 max_prefered = idev->cnf.temp_prefered_lft -
2291                                idev->cnf.max_desync_factor - age;
2292                 if (max_prefered < 0)
2293                         max_prefered = 0;
2294
2295                 if (valid_lft > max_valid)
2296                         valid_lft = max_valid;
2297
2298                 if (prefered_lft > max_prefered)
2299                         prefered_lft = max_prefered;
2300
2301                 spin_lock(&ift->lock);
2302                 flags = ift->flags;
2303                 ift->valid_lft = valid_lft;
2304                 ift->prefered_lft = prefered_lft;
2305                 ift->tstamp = now;
2306                 if (prefered_lft > 0)
2307                         ift->flags &= ~IFA_F_DEPRECATED;
2308
2309                 spin_unlock(&ift->lock);
2310                 if (!(flags&IFA_F_TENTATIVE))
2311                         ipv6_ifa_notify(0, ift);
2312         }
2313
2314         if ((create || list_empty(&idev->tempaddr_list)) &&
2315             idev->cnf.use_tempaddr > 0) {
2316                 /* When a new public address is created as described
2317                  * in [ADDRCONF], also create a new temporary address.
2318                  * Also create a temporary address if it's enabled but
2319                  * no temporary address currently exists.
2320                  */
2321                 read_unlock_bh(&idev->lock);
2322                 ipv6_create_tempaddr(ifp, NULL);
2323         } else {
2324                 read_unlock_bh(&idev->lock);
2325         }
2326 }
2327
2328 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2329 {
2330         struct prefix_info *pinfo;
2331         __u32 valid_lft;
2332         __u32 prefered_lft;
2333         int addr_type;
2334         u32 addr_flags = 0;
2335         struct inet6_dev *in6_dev;
2336         struct net *net = dev_net(dev);
2337
2338         pinfo = (struct prefix_info *) opt;
2339
2340         if (len < sizeof(struct prefix_info)) {
2341                 ADBG("addrconf: prefix option too short\n");
2342                 return;
2343         }
2344
2345         /*
2346          *      Validation checks ([ADDRCONF], page 19)
2347          */
2348
2349         addr_type = ipv6_addr_type(&pinfo->prefix);
2350
2351         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2352                 return;
2353
2354         valid_lft = ntohl(pinfo->valid);
2355         prefered_lft = ntohl(pinfo->prefered);
2356
2357         if (prefered_lft > valid_lft) {
2358                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2359                 return;
2360         }
2361
2362         in6_dev = in6_dev_get(dev);
2363
2364         if (!in6_dev) {
2365                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2366                                     dev->name);
2367                 return;
2368         }
2369
2370         /*
2371          *      Two things going on here:
2372          *      1) Add routes for on-link prefixes
2373          *      2) Configure prefixes with the auto flag set
2374          */
2375
2376         if (pinfo->onlink) {
2377                 struct rt6_info *rt;
2378                 unsigned long rt_expires;
2379
2380                 /* Avoid arithmetic overflow. Really, we could
2381                  * save rt_expires in seconds, likely valid_lft,
2382                  * but it would require division in fib gc, that it
2383                  * not good.
2384                  */
2385                 if (HZ > USER_HZ)
2386                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2387                 else
2388                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2389
2390                 if (addrconf_finite_timeout(rt_expires))
2391                         rt_expires *= HZ;
2392
2393                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2394                                                pinfo->prefix_len,
2395                                                dev,
2396                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2397                                                RTF_GATEWAY | RTF_DEFAULT);
2398
2399                 if (rt) {
2400                         /* Autoconf prefix route */
2401                         if (valid_lft == 0) {
2402                                 ip6_del_rt(rt);
2403                                 rt = NULL;
2404                         } else if (addrconf_finite_timeout(rt_expires)) {
2405                                 /* not infinity */
2406                                 rt6_set_expires(rt, jiffies + rt_expires);
2407                         } else {
2408                                 rt6_clean_expires(rt);
2409                         }
2410                 } else if (valid_lft) {
2411                         clock_t expires = 0;
2412                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2413                         if (addrconf_finite_timeout(rt_expires)) {
2414                                 /* not infinity */
2415                                 flags |= RTF_EXPIRES;
2416                                 expires = jiffies_to_clock_t(rt_expires);
2417                         }
2418                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2419                                               dev, expires, flags);
2420                 }
2421                 ip6_rt_put(rt);
2422         }
2423
2424         /* Try to figure out our local address for this prefix */
2425
2426         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2427                 struct inet6_ifaddr *ifp;
2428                 struct in6_addr addr;
2429                 int create = 0, update_lft = 0;
2430                 bool tokenized = false;
2431
2432                 if (pinfo->prefix_len == 64) {
2433                         memcpy(&addr, &pinfo->prefix, 8);
2434
2435                         if (!ipv6_addr_any(&in6_dev->token)) {
2436                                 read_lock_bh(&in6_dev->lock);
2437                                 memcpy(addr.s6_addr + 8,
2438                                        in6_dev->token.s6_addr + 8, 8);
2439                                 read_unlock_bh(&in6_dev->lock);
2440                                 tokenized = true;
2441                         } else if (in6_dev->addr_gen_mode ==
2442                                    IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2443                                    !ipv6_generate_stable_address(&addr, 0,
2444                                                                  in6_dev)) {
2445                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2446                                 goto ok;
2447                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2448                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2449                                 in6_dev_put(in6_dev);
2450                                 return;
2451                         }
2452                         goto ok;
2453                 }
2454                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2455                                     pinfo->prefix_len);
2456                 in6_dev_put(in6_dev);
2457                 return;
2458
2459 ok:
2460
2461                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2462
2463                 if (!ifp && valid_lft) {
2464                         int max_addresses = in6_dev->cnf.max_addresses;
2465
2466 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2467                         if (in6_dev->cnf.optimistic_dad &&
2468                             !net->ipv6.devconf_all->forwarding && sllao)
2469                                 addr_flags |= IFA_F_OPTIMISTIC;
2470 #endif
2471
2472                         /* Do not allow to create too much of autoconfigured
2473                          * addresses; this would be too easy way to crash kernel.
2474                          */
2475                         if (!max_addresses ||
2476                             ipv6_count_addresses(in6_dev) < max_addresses)
2477                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2478                                                     pinfo->prefix_len,
2479                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2480                                                     addr_flags, valid_lft,
2481                                                     prefered_lft);
2482
2483                         if (IS_ERR_OR_NULL(ifp)) {
2484                                 in6_dev_put(in6_dev);
2485                                 return;
2486                         }
2487
2488                         update_lft = 0;
2489                         create = 1;
2490                         spin_lock_bh(&ifp->lock);
2491                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2492                         ifp->cstamp = jiffies;
2493                         ifp->tokenized = tokenized;
2494                         spin_unlock_bh(&ifp->lock);
2495                         addrconf_dad_start(ifp);
2496                 }
2497
2498                 if (ifp) {
2499                         u32 flags;
2500                         unsigned long now;
2501                         u32 stored_lft;
2502
2503                         /* update lifetime (RFC2462 5.5.3 e) */
2504                         spin_lock_bh(&ifp->lock);
2505                         now = jiffies;
2506                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2507                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2508                         else
2509                                 stored_lft = 0;
2510                         if (!update_lft && !create && stored_lft) {
2511                                 const u32 minimum_lft = min_t(u32,
2512                                         stored_lft, MIN_VALID_LIFETIME);
2513                                 valid_lft = max(valid_lft, minimum_lft);
2514
2515                                 /* RFC4862 Section 5.5.3e:
2516                                  * "Note that the preferred lifetime of the
2517                                  *  corresponding address is always reset to
2518                                  *  the Preferred Lifetime in the received
2519                                  *  Prefix Information option, regardless of
2520                                  *  whether the valid lifetime is also reset or
2521                                  *  ignored."
2522                                  *
2523                                  * So we should always update prefered_lft here.
2524                                  */
2525                                 update_lft = 1;
2526                         }
2527
2528                         if (update_lft) {
2529                                 ifp->valid_lft = valid_lft;
2530                                 ifp->prefered_lft = prefered_lft;
2531                                 ifp->tstamp = now;
2532                                 flags = ifp->flags;
2533                                 ifp->flags &= ~IFA_F_DEPRECATED;
2534                                 spin_unlock_bh(&ifp->lock);
2535
2536                                 if (!(flags&IFA_F_TENTATIVE))
2537                                         ipv6_ifa_notify(0, ifp);
2538                         } else
2539                                 spin_unlock_bh(&ifp->lock);
2540
2541                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2542                                          create, now);
2543
2544                         in6_ifa_put(ifp);
2545                         addrconf_verify();
2546                 }
2547         }
2548         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2549         in6_dev_put(in6_dev);
2550 }
2551
2552 /*
2553  *      Set destination address.
2554  *      Special case for SIT interfaces where we create a new "virtual"
2555  *      device.
2556  */
2557 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2558 {
2559         struct in6_ifreq ireq;
2560         struct net_device *dev;
2561         int err = -EINVAL;
2562
2563         rtnl_lock();
2564
2565         err = -EFAULT;
2566         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2567                 goto err_exit;
2568
2569         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2570
2571         err = -ENODEV;
2572         if (!dev)
2573                 goto err_exit;
2574
2575 #if IS_ENABLED(CONFIG_IPV6_SIT)
2576         if (dev->type == ARPHRD_SIT) {
2577                 const struct net_device_ops *ops = dev->netdev_ops;
2578                 struct ifreq ifr;
2579                 struct ip_tunnel_parm p;
2580
2581                 err = -EADDRNOTAVAIL;
2582                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2583                         goto err_exit;
2584
2585                 memset(&p, 0, sizeof(p));
2586                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2587                 p.iph.saddr = 0;
2588                 p.iph.version = 4;
2589                 p.iph.ihl = 5;
2590                 p.iph.protocol = IPPROTO_IPV6;
2591                 p.iph.ttl = 64;
2592                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2593
2594                 if (ops->ndo_do_ioctl) {
2595                         mm_segment_t oldfs = get_fs();
2596
2597                         set_fs(KERNEL_DS);
2598                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2599                         set_fs(oldfs);
2600                 } else
2601                         err = -EOPNOTSUPP;
2602
2603                 if (err == 0) {
2604                         err = -ENOBUFS;
2605                         dev = __dev_get_by_name(net, p.name);
2606                         if (!dev)
2607                                 goto err_exit;
2608                         err = dev_open(dev);
2609                 }
2610         }
2611 #endif
2612
2613 err_exit:
2614         rtnl_unlock();
2615         return err;
2616 }
2617
2618 static int ipv6_mc_config(struct sock *sk, bool join,
2619                           const struct in6_addr *addr, int ifindex)
2620 {
2621         int ret;
2622
2623         ASSERT_RTNL();
2624
2625         lock_sock(sk);
2626         if (join)
2627                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2628         else
2629                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2630         release_sock(sk);
2631
2632         return ret;
2633 }
2634
2635 /*
2636  *      Manual configuration of address on an interface
2637  */
2638 static int inet6_addr_add(struct net *net, int ifindex,
2639                           const struct in6_addr *pfx,
2640                           const struct in6_addr *peer_pfx,
2641                           unsigned int plen, __u32 ifa_flags,
2642                           __u32 prefered_lft, __u32 valid_lft)
2643 {
2644         struct inet6_ifaddr *ifp;
2645         struct inet6_dev *idev;
2646         struct net_device *dev;
2647         unsigned long timeout;
2648         clock_t expires;
2649         int scope;
2650         u32 flags;
2651
2652         ASSERT_RTNL();
2653
2654         if (plen > 128)
2655                 return -EINVAL;
2656
2657         /* check the lifetime */
2658         if (!valid_lft || prefered_lft > valid_lft)
2659                 return -EINVAL;
2660
2661         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2662                 return -EINVAL;
2663
2664         dev = __dev_get_by_index(net, ifindex);
2665         if (!dev)
2666                 return -ENODEV;
2667
2668         idev = addrconf_add_dev(dev);
2669         if (IS_ERR(idev))
2670                 return PTR_ERR(idev);
2671
2672         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2673                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2674                                          true, pfx, ifindex);
2675
2676                 if (ret < 0)
2677                         return ret;
2678         }
2679
2680         scope = ipv6_addr_scope(pfx);
2681
2682         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2683         if (addrconf_finite_timeout(timeout)) {
2684                 expires = jiffies_to_clock_t(timeout * HZ);
2685                 valid_lft = timeout;
2686                 flags = RTF_EXPIRES;
2687         } else {
2688                 expires = 0;
2689                 flags = 0;
2690                 ifa_flags |= IFA_F_PERMANENT;
2691         }
2692
2693         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2694         if (addrconf_finite_timeout(timeout)) {
2695                 if (timeout == 0)
2696                         ifa_flags |= IFA_F_DEPRECATED;
2697                 prefered_lft = timeout;
2698         }
2699
2700         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2701                             valid_lft, prefered_lft);
2702
2703         if (!IS_ERR(ifp)) {
2704                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2705                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2706                                               expires, flags);
2707                 }
2708
2709                 /*
2710                  * Note that section 3.1 of RFC 4429 indicates
2711                  * that the Optimistic flag should not be set for
2712                  * manually configured addresses
2713                  */
2714                 addrconf_dad_start(ifp);
2715                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2716                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2717                                          true, jiffies);
2718                 in6_ifa_put(ifp);
2719                 addrconf_verify_rtnl();
2720                 return 0;
2721         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2722                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2723                                false, pfx, ifindex);
2724         }
2725
2726         return PTR_ERR(ifp);
2727 }
2728
2729 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2730                           const struct in6_addr *pfx, unsigned int plen)
2731 {
2732         struct inet6_ifaddr *ifp;
2733         struct inet6_dev *idev;
2734         struct net_device *dev;
2735
2736         if (plen > 128)
2737                 return -EINVAL;
2738
2739         dev = __dev_get_by_index(net, ifindex);
2740         if (!dev)
2741                 return -ENODEV;
2742
2743         idev = __in6_dev_get(dev);
2744         if (!idev)
2745                 return -ENXIO;
2746
2747         read_lock_bh(&idev->lock);
2748         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2749                 if (ifp->prefix_len == plen &&
2750                     ipv6_addr_equal(pfx, &ifp->addr)) {
2751                         in6_ifa_hold(ifp);
2752                         read_unlock_bh(&idev->lock);
2753
2754                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2755                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2756                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2757                                                  jiffies);
2758                         ipv6_del_addr(ifp);
2759                         addrconf_verify_rtnl();
2760                         if (ipv6_addr_is_multicast(pfx)) {
2761                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2762                                                false, pfx, dev->ifindex);
2763                         }
2764                         return 0;
2765                 }
2766         }
2767         read_unlock_bh(&idev->lock);
2768         return -EADDRNOTAVAIL;
2769 }
2770
2771
2772 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2773 {
2774         struct in6_ifreq ireq;
2775         int err;
2776
2777         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2778                 return -EPERM;
2779
2780         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2781                 return -EFAULT;
2782
2783         rtnl_lock();
2784         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2785                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2786                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2787         rtnl_unlock();
2788         return err;
2789 }
2790
2791 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2792 {
2793         struct in6_ifreq ireq;
2794         int err;
2795
2796         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2797                 return -EPERM;
2798
2799         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2800                 return -EFAULT;
2801
2802         rtnl_lock();
2803         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2804                              ireq.ifr6_prefixlen);
2805         rtnl_unlock();
2806         return err;
2807 }
2808
2809 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2810                      int plen, int scope)
2811 {
2812         struct inet6_ifaddr *ifp;
2813
2814         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2815                             scope, IFA_F_PERMANENT,
2816                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2817         if (!IS_ERR(ifp)) {
2818                 spin_lock_bh(&ifp->lock);
2819                 ifp->flags &= ~IFA_F_TENTATIVE;
2820                 spin_unlock_bh(&ifp->lock);
2821                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2822                 in6_ifa_put(ifp);
2823         }
2824 }
2825
2826 #if IS_ENABLED(CONFIG_IPV6_SIT)
2827 static void sit_add_v4_addrs(struct inet6_dev *idev)
2828 {
2829         struct in6_addr addr;
2830         struct net_device *dev;
2831         struct net *net = dev_net(idev->dev);
2832         int scope, plen;
2833         u32 pflags = 0;
2834
2835         ASSERT_RTNL();
2836
2837         memset(&addr, 0, sizeof(struct in6_addr));
2838         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2839
2840         if (idev->dev->flags&IFF_POINTOPOINT) {
2841                 addr.s6_addr32[0] = htonl(0xfe800000);
2842                 scope = IFA_LINK;
2843                 plen = 64;
2844         } else {
2845                 scope = IPV6_ADDR_COMPATv4;
2846                 plen = 96;
2847                 pflags |= RTF_NONEXTHOP;
2848         }
2849
2850         if (addr.s6_addr32[3]) {
2851                 add_addr(idev, &addr, plen, scope);
2852                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2853                 return;
2854         }
2855
2856         for_each_netdev(net, dev) {
2857                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2858                 if (in_dev && (dev->flags & IFF_UP)) {
2859                         struct in_ifaddr *ifa;
2860
2861                         int flag = scope;
2862
2863                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2864
2865                                 addr.s6_addr32[3] = ifa->ifa_local;
2866
2867                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2868                                         continue;
2869                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2870                                         if (idev->dev->flags&IFF_POINTOPOINT)
2871                                                 continue;
2872                                         flag |= IFA_HOST;
2873                                 }
2874
2875                                 add_addr(idev, &addr, plen, flag);
2876                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2877                                                       pflags);
2878                         }
2879                 }
2880         }
2881 }
2882 #endif
2883
2884 static void init_loopback(struct net_device *dev)
2885 {
2886         struct inet6_dev  *idev;
2887         struct net_device *sp_dev;
2888         struct inet6_ifaddr *sp_ifa;
2889         struct rt6_info *sp_rt;
2890
2891         /* ::1 */
2892
2893         ASSERT_RTNL();
2894
2895         idev = ipv6_find_idev(dev);
2896         if (!idev) {
2897                 pr_debug("%s: add_dev failed\n", __func__);
2898                 return;
2899         }
2900
2901         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2902
2903         /* Add routes to other interface's IPv6 addresses */
2904         for_each_netdev(dev_net(dev), sp_dev) {
2905                 if (!strcmp(sp_dev->name, dev->name))
2906                         continue;
2907
2908                 idev = __in6_dev_get(sp_dev);
2909                 if (!idev)
2910                         continue;
2911
2912                 read_lock_bh(&idev->lock);
2913                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2914
2915                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2916                                 continue;
2917
2918                         if (sp_ifa->rt) {
2919                                 /* This dst has been added to garbage list when
2920                                  * lo device down, release this obsolete dst and
2921                                  * reallocate a new router for ifa.
2922                                  */
2923                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
2924                                         ip6_rt_put(sp_ifa->rt);
2925                                         sp_ifa->rt = NULL;
2926                                 } else {
2927                                         continue;
2928                                 }
2929                         }
2930
2931                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2932
2933                         /* Failure cases are ignored */
2934                         if (!IS_ERR(sp_rt)) {
2935                                 sp_ifa->rt = sp_rt;
2936                                 ip6_ins_rt(sp_rt);
2937                         }
2938                 }
2939                 read_unlock_bh(&idev->lock);
2940         }
2941 }
2942
2943 static void addrconf_add_linklocal(struct inet6_dev *idev,
2944                                    const struct in6_addr *addr, u32 flags)
2945 {
2946         struct inet6_ifaddr *ifp;
2947         u32 addr_flags = flags | IFA_F_PERMANENT;
2948
2949 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2950         if (idev->cnf.optimistic_dad &&
2951             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2952                 addr_flags |= IFA_F_OPTIMISTIC;
2953 #endif
2954
2955         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2956                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2957         if (!IS_ERR(ifp)) {
2958                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2959                 addrconf_dad_start(ifp);
2960                 in6_ifa_put(ifp);
2961         }
2962 }
2963
2964 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2965 {
2966         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2967                 return true;
2968
2969         if (address.s6_addr32[2] == htonl(0x02005eff) &&
2970             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2971                 return true;
2972
2973         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2974             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2975                 return true;
2976
2977         return false;
2978 }
2979
2980 static int ipv6_generate_stable_address(struct in6_addr *address,
2981                                         u8 dad_count,
2982                                         const struct inet6_dev *idev)
2983 {
2984         static DEFINE_SPINLOCK(lock);
2985         static __u32 digest[SHA_DIGEST_WORDS];
2986         static __u32 workspace[SHA_WORKSPACE_WORDS];
2987
2988         static union {
2989                 char __data[SHA_MESSAGE_BYTES];
2990                 struct {
2991                         struct in6_addr secret;
2992                         __be32 prefix[2];
2993                         unsigned char hwaddr[MAX_ADDR_LEN];
2994                         u8 dad_count;
2995                 } __packed;
2996         } data;
2997
2998         struct in6_addr secret;
2999         struct in6_addr temp;
3000         struct net *net = dev_net(idev->dev);
3001
3002         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3003
3004         if (idev->cnf.stable_secret.initialized)
3005                 secret = idev->cnf.stable_secret.secret;
3006         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3007                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3008         else
3009                 return -1;
3010
3011 retry:
3012         spin_lock_bh(&lock);
3013
3014         sha_init(digest);
3015         memset(&data, 0, sizeof(data));
3016         memset(workspace, 0, sizeof(workspace));
3017         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3018         data.prefix[0] = address->s6_addr32[0];
3019         data.prefix[1] = address->s6_addr32[1];
3020         data.secret = secret;
3021         data.dad_count = dad_count;
3022
3023         sha_transform(digest, data.__data, workspace);
3024
3025         temp = *address;
3026         temp.s6_addr32[2] = (__force __be32)digest[0];
3027         temp.s6_addr32[3] = (__force __be32)digest[1];
3028
3029         spin_unlock_bh(&lock);
3030
3031         if (ipv6_reserved_interfaceid(temp)) {
3032                 dad_count++;
3033                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3034                         return -1;
3035                 goto retry;
3036         }
3037
3038         *address = temp;
3039         return 0;
3040 }
3041
3042 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3043 {
3044         struct in6_addr addr;
3045
3046         /* no link local addresses on L3 master devices */
3047         if (netif_is_l3_master(idev->dev))
3048                 return;
3049
3050         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3051
3052         if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3053                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3054                         addrconf_add_linklocal(idev, &addr,
3055                                                IFA_F_STABLE_PRIVACY);
3056                 else if (prefix_route)
3057                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3058         } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3059                 /* addrconf_add_linklocal also adds a prefix_route and we
3060                  * only need to care about prefix routes if ipv6_generate_eui64
3061                  * couldn't generate one.
3062                  */
3063                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3064                         addrconf_add_linklocal(idev, &addr, 0);
3065                 else if (prefix_route)
3066                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3067         }
3068 }
3069
3070 static void addrconf_dev_config(struct net_device *dev)
3071 {
3072         struct inet6_dev *idev;
3073
3074         ASSERT_RTNL();
3075
3076         if ((dev->type != ARPHRD_ETHER) &&
3077             (dev->type != ARPHRD_FDDI) &&
3078             (dev->type != ARPHRD_ARCNET) &&
3079             (dev->type != ARPHRD_INFINIBAND) &&
3080             (dev->type != ARPHRD_IEEE802154) &&
3081             (dev->type != ARPHRD_IEEE1394) &&
3082             (dev->type != ARPHRD_TUNNEL6) &&
3083             (dev->type != ARPHRD_6LOWPAN)) {
3084                 /* Alas, we support only Ethernet autoconfiguration. */
3085                 return;
3086         }
3087
3088         idev = addrconf_add_dev(dev);
3089         if (IS_ERR(idev))
3090                 return;
3091
3092         addrconf_addr_gen(idev, false);
3093 }
3094
3095 #if IS_ENABLED(CONFIG_IPV6_SIT)
3096 static void addrconf_sit_config(struct net_device *dev)
3097 {
3098         struct inet6_dev *idev;
3099
3100         ASSERT_RTNL();
3101
3102         /*
3103          * Configure the tunnel with one of our IPv4
3104          * addresses... we should configure all of
3105          * our v4 addrs in the tunnel
3106          */
3107
3108         idev = ipv6_find_idev(dev);
3109         if (!idev) {
3110                 pr_debug("%s: add_dev failed\n", __func__);
3111                 return;
3112         }
3113
3114         if (dev->priv_flags & IFF_ISATAP) {
3115                 addrconf_addr_gen(idev, false);
3116                 return;
3117         }
3118
3119         sit_add_v4_addrs(idev);
3120
3121         if (dev->flags&IFF_POINTOPOINT)
3122                 addrconf_add_mroute(dev);
3123 }
3124 #endif
3125
3126 #if IS_ENABLED(CONFIG_NET_IPGRE)
3127 static void addrconf_gre_config(struct net_device *dev)
3128 {
3129         struct inet6_dev *idev;
3130
3131         ASSERT_RTNL();
3132
3133         idev = ipv6_find_idev(dev);
3134         if (!idev) {
3135                 pr_debug("%s: add_dev failed\n", __func__);
3136                 return;
3137         }
3138
3139         addrconf_addr_gen(idev, true);
3140         if (dev->flags & IFF_POINTOPOINT)
3141                 addrconf_add_mroute(dev);
3142 }
3143 #endif
3144
3145 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3146                            void *ptr)
3147 {
3148         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3149         struct inet6_dev *idev = __in6_dev_get(dev);
3150         struct net *net = dev_net(dev);
3151         int run_pending = 0;
3152         int err;
3153
3154         switch (event) {
3155         case NETDEV_REGISTER:
3156                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3157                         idev = ipv6_add_dev(dev);
3158                         if (IS_ERR(idev))
3159                                 return notifier_from_errno(PTR_ERR(idev));
3160                 }
3161                 break;
3162
3163         case NETDEV_CHANGEMTU:
3164                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3165                 if (dev->mtu < IPV6_MIN_MTU) {
3166                         addrconf_ifdown(dev, dev != net->loopback_dev);
3167                         break;
3168                 }
3169
3170                 if (idev) {
3171                         rt6_mtu_change(dev, dev->mtu);
3172                         idev->cnf.mtu6 = dev->mtu;
3173                         break;
3174                 }
3175
3176                 /* allocate new idev */
3177                 idev = ipv6_add_dev(dev);
3178                 if (IS_ERR(idev))
3179                         break;
3180
3181                 /* device is still not ready */
3182                 if (!(idev->if_flags & IF_READY))
3183                         break;
3184
3185                 run_pending = 1;
3186
3187                 /* fall through */
3188
3189         case NETDEV_UP:
3190         case NETDEV_CHANGE:
3191                 if (dev->flags & IFF_SLAVE)
3192                         break;
3193
3194                 if (idev && idev->cnf.disable_ipv6)
3195                         break;
3196
3197                 if (event == NETDEV_UP) {
3198                         if (!addrconf_qdisc_ok(dev)) {
3199                                 /* device is not ready yet. */
3200                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3201                                         dev->name);
3202                                 break;
3203                         }
3204
3205                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3206                                 idev = ipv6_add_dev(dev);
3207
3208                         if (!IS_ERR_OR_NULL(idev)) {
3209                                 idev->if_flags |= IF_READY;
3210                                 run_pending = 1;
3211                         }
3212                 } else if (event == NETDEV_CHANGE) {
3213                         if (!addrconf_qdisc_ok(dev)) {
3214                                 /* device is still not ready. */
3215                                 break;
3216                         }
3217
3218                         if (idev) {
3219                                 if (idev->if_flags & IF_READY) {
3220                                         /* device is already configured -
3221                                          * but resend MLD reports, we might
3222                                          * have roamed and need to update
3223                                          * multicast snooping switches
3224                                          */
3225                                         ipv6_mc_up(idev);
3226                                         break;
3227                                 }
3228                                 idev->if_flags |= IF_READY;
3229                         }
3230
3231                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3232                                 dev->name);
3233
3234                         run_pending = 1;
3235                 }
3236
3237                 switch (dev->type) {
3238 #if IS_ENABLED(CONFIG_IPV6_SIT)
3239                 case ARPHRD_SIT:
3240                         addrconf_sit_config(dev);
3241                         break;
3242 #endif
3243 #if IS_ENABLED(CONFIG_NET_IPGRE)
3244                 case ARPHRD_IPGRE:
3245                         addrconf_gre_config(dev);
3246                         break;
3247 #endif
3248                 case ARPHRD_LOOPBACK:
3249                         init_loopback(dev);
3250                         break;
3251
3252                 default:
3253                         addrconf_dev_config(dev);
3254                         break;
3255                 }
3256
3257                 if (!IS_ERR_OR_NULL(idev)) {
3258                         if (run_pending)
3259                                 addrconf_dad_run(idev);
3260
3261                         /*
3262                          * If the MTU changed during the interface down,
3263                          * when the interface up, the changed MTU must be
3264                          * reflected in the idev as well as routers.
3265                          */
3266                         if (idev->cnf.mtu6 != dev->mtu &&
3267                             dev->mtu >= IPV6_MIN_MTU) {
3268                                 rt6_mtu_change(dev, dev->mtu);
3269                                 idev->cnf.mtu6 = dev->mtu;
3270                         }
3271                         idev->tstamp = jiffies;
3272                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3273
3274                         /*
3275                          * If the changed mtu during down is lower than
3276                          * IPV6_MIN_MTU stop IPv6 on this interface.
3277                          */
3278                         if (dev->mtu < IPV6_MIN_MTU)
3279                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3280                 }
3281                 break;
3282
3283         case NETDEV_DOWN:
3284         case NETDEV_UNREGISTER:
3285                 /*
3286                  *      Remove all addresses from this interface.
3287                  */
3288                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3289                 break;
3290
3291         case NETDEV_CHANGENAME:
3292                 if (idev) {
3293                         snmp6_unregister_dev(idev);
3294                         addrconf_sysctl_unregister(idev);
3295                         err = addrconf_sysctl_register(idev);
3296                         if (err)
3297                                 return notifier_from_errno(err);
3298                         err = snmp6_register_dev(idev);
3299                         if (err) {
3300                                 addrconf_sysctl_unregister(idev);
3301                                 return notifier_from_errno(err);
3302                         }
3303                 }
3304                 break;
3305
3306         case NETDEV_PRE_TYPE_CHANGE:
3307         case NETDEV_POST_TYPE_CHANGE:
3308                 addrconf_type_change(dev, event);
3309                 break;
3310         }
3311
3312         return NOTIFY_OK;
3313 }
3314
3315 /*
3316  *      addrconf module should be notified of a device going up
3317  */
3318 static struct notifier_block ipv6_dev_notf = {
3319         .notifier_call = addrconf_notify,
3320         .priority = ADDRCONF_NOTIFY_PRIORITY,
3321 };
3322
3323 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3324 {
3325         struct inet6_dev *idev;
3326         ASSERT_RTNL();
3327
3328         idev = __in6_dev_get(dev);
3329
3330         if (event == NETDEV_POST_TYPE_CHANGE)
3331                 ipv6_mc_remap(idev);
3332         else if (event == NETDEV_PRE_TYPE_CHANGE)
3333                 ipv6_mc_unmap(idev);
3334 }
3335
3336 static int addrconf_ifdown(struct net_device *dev, int how)
3337 {
3338         struct net *net = dev_net(dev);
3339         struct inet6_dev *idev;
3340         struct inet6_ifaddr *ifa;
3341         int state, i;
3342
3343         ASSERT_RTNL();
3344
3345         rt6_ifdown(net, dev);
3346         neigh_ifdown(&nd_tbl, dev);
3347
3348         idev = __in6_dev_get(dev);
3349         if (!idev)
3350                 return -ENODEV;
3351
3352         /*
3353          * Step 1: remove reference to ipv6 device from parent device.
3354          *         Do not dev_put!
3355          */
3356         if (how) {
3357                 idev->dead = 1;
3358
3359                 /* protected by rtnl_lock */
3360                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3361
3362                 /* Step 1.5: remove snmp6 entry */
3363                 snmp6_unregister_dev(idev);
3364
3365         }
3366
3367         /* Step 2: clear hash table */
3368         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3369                 struct hlist_head *h = &inet6_addr_lst[i];
3370
3371                 spin_lock_bh(&addrconf_hash_lock);
3372 restart:
3373                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3374                         if (ifa->idev == idev) {
3375                                 hlist_del_init_rcu(&ifa->addr_lst);
3376                                 addrconf_del_dad_work(ifa);
3377                                 goto restart;
3378                         }
3379                 }
3380                 spin_unlock_bh(&addrconf_hash_lock);
3381         }
3382
3383         write_lock_bh(&idev->lock);
3384
3385         addrconf_del_rs_timer(idev);
3386
3387         /* Step 2: clear flags for stateless addrconf */
3388         if (!how)
3389                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3390
3391         if (how && del_timer(&idev->regen_timer))
3392                 in6_dev_put(idev);
3393
3394         /* Step 3: clear tempaddr list */
3395         while (!list_empty(&idev->tempaddr_list)) {
3396                 ifa = list_first_entry(&idev->tempaddr_list,
3397                                        struct inet6_ifaddr, tmp_list);
3398                 list_del(&ifa->tmp_list);
3399                 write_unlock_bh(&idev->lock);
3400                 spin_lock_bh(&ifa->lock);
3401
3402                 if (ifa->ifpub) {
3403                         in6_ifa_put(ifa->ifpub);
3404                         ifa->ifpub = NULL;
3405                 }
3406                 spin_unlock_bh(&ifa->lock);
3407                 in6_ifa_put(ifa);
3408                 write_lock_bh(&idev->lock);
3409         }
3410
3411         while (!list_empty(&idev->addr_list)) {
3412                 ifa = list_first_entry(&idev->addr_list,
3413                                        struct inet6_ifaddr, if_list);
3414                 addrconf_del_dad_work(ifa);
3415
3416                 list_del(&ifa->if_list);
3417
3418                 write_unlock_bh(&idev->lock);
3419
3420                 spin_lock_bh(&ifa->lock);
3421                 state = ifa->state;
3422                 ifa->state = INET6_IFADDR_STATE_DEAD;
3423                 spin_unlock_bh(&ifa->lock);
3424
3425                 if (state != INET6_IFADDR_STATE_DEAD) {
3426                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3427                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3428                 }
3429                 in6_ifa_put(ifa);
3430
3431                 write_lock_bh(&idev->lock);
3432         }
3433
3434         write_unlock_bh(&idev->lock);
3435
3436         /* Step 5: Discard anycast and multicast list */
3437         if (how) {
3438                 ipv6_ac_destroy_dev(idev);
3439                 ipv6_mc_destroy_dev(idev);
3440         } else {
3441                 ipv6_mc_down(idev);
3442         }
3443
3444         idev->tstamp = jiffies;
3445
3446         /* Last: Shot the device (if unregistered) */
3447         if (how) {
3448                 addrconf_sysctl_unregister(idev);
3449                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3450                 neigh_ifdown(&nd_tbl, dev);
3451                 in6_dev_put(idev);
3452         }
3453         return 0;
3454 }
3455
3456 static void addrconf_rs_timer(unsigned long data)
3457 {
3458         struct inet6_dev *idev = (struct inet6_dev *)data;
3459         struct net_device *dev = idev->dev;
3460         struct in6_addr lladdr;
3461
3462         write_lock(&idev->lock);
3463         if (idev->dead || !(idev->if_flags & IF_READY))
3464                 goto out;
3465
3466         if (!ipv6_accept_ra(idev))
3467                 goto out;
3468
3469         /* Announcement received after solicitation was sent */
3470         if (idev->if_flags & IF_RA_RCVD)
3471                 goto out;
3472
3473         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3474                 write_unlock(&idev->lock);
3475                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3476                         ndisc_send_rs(dev, &lladdr,
3477                                       &in6addr_linklocal_allrouters);
3478                 else
3479                         goto put;
3480
3481                 write_lock(&idev->lock);
3482                 /* The wait after the last probe can be shorter */
3483                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3484                                              idev->cnf.rtr_solicits) ?
3485                                       idev->cnf.rtr_solicit_delay :
3486                                       idev->cnf.rtr_solicit_interval);
3487         } else {
3488                 /*
3489                  * Note: we do not support deprecated "all on-link"
3490                  * assumption any longer.
3491                  */
3492                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3493         }
3494
3495 out:
3496         write_unlock(&idev->lock);
3497 put:
3498         in6_dev_put(idev);
3499 }
3500
3501 /*
3502  *      Duplicate Address Detection
3503  */
3504 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3505 {
3506         unsigned long rand_num;
3507         struct inet6_dev *idev = ifp->idev;
3508
3509         if (ifp->flags & IFA_F_OPTIMISTIC)
3510                 rand_num = 0;
3511         else
3512                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3513
3514         ifp->dad_probes = idev->cnf.dad_transmits;
3515         addrconf_mod_dad_work(ifp, rand_num);
3516 }
3517
3518 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3519 {
3520         struct inet6_dev *idev = ifp->idev;
3521         struct net_device *dev = idev->dev;
3522         bool notify = false;
3523
3524         addrconf_join_solict(dev, &ifp->addr);
3525
3526         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3527
3528         read_lock_bh(&idev->lock);
3529         spin_lock(&ifp->lock);
3530         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3531                 goto out;
3532
3533         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3534             idev->cnf.accept_dad < 1 ||
3535             !(ifp->flags&IFA_F_TENTATIVE) ||
3536             ifp->flags & IFA_F_NODAD) {
3537                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3538                 spin_unlock(&ifp->lock);
3539                 read_unlock_bh(&idev->lock);
3540
3541                 addrconf_dad_completed(ifp);
3542                 return;
3543         }
3544
3545         if (!(idev->if_flags & IF_READY)) {
3546                 spin_unlock(&ifp->lock);
3547                 read_unlock_bh(&idev->lock);
3548                 /*
3549                  * If the device is not ready:
3550                  * - keep it tentative if it is a permanent address.
3551                  * - otherwise, kill it.
3552                  */
3553                 in6_ifa_hold(ifp);
3554                 addrconf_dad_stop(ifp, 0);
3555                 return;
3556         }
3557
3558         /*
3559          * Optimistic nodes can start receiving
3560          * Frames right away
3561          */
3562         if (ifp->flags & IFA_F_OPTIMISTIC) {
3563                 ip6_ins_rt(ifp->rt);
3564                 if (ipv6_use_optimistic_addr(idev)) {
3565                         /* Because optimistic nodes can use this address,
3566                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3567                          */
3568                         notify = true;
3569                 }
3570         }
3571
3572         addrconf_dad_kick(ifp);
3573 out:
3574         spin_unlock(&ifp->lock);
3575         read_unlock_bh(&idev->lock);
3576         if (notify)
3577                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3578 }
3579
3580 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3581 {
3582         bool begin_dad = false;
3583
3584         spin_lock_bh(&ifp->lock);
3585         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3586                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3587                 begin_dad = true;
3588         }
3589         spin_unlock_bh(&ifp->lock);
3590
3591         if (begin_dad)
3592                 addrconf_mod_dad_work(ifp, 0);
3593 }
3594
3595 static void addrconf_dad_work(struct work_struct *w)
3596 {
3597         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3598                                                 struct inet6_ifaddr,
3599                                                 dad_work);
3600         struct inet6_dev *idev = ifp->idev;
3601         struct in6_addr mcaddr;
3602
3603         enum {
3604                 DAD_PROCESS,
3605                 DAD_BEGIN,
3606                 DAD_ABORT,
3607         } action = DAD_PROCESS;
3608
3609         rtnl_lock();
3610
3611         spin_lock_bh(&ifp->lock);
3612         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3613                 action = DAD_BEGIN;
3614                 ifp->state = INET6_IFADDR_STATE_DAD;
3615         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3616                 action = DAD_ABORT;
3617                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3618         }
3619         spin_unlock_bh(&ifp->lock);
3620
3621         if (action == DAD_BEGIN) {
3622                 addrconf_dad_begin(ifp);
3623                 goto out;
3624         } else if (action == DAD_ABORT) {
3625                 in6_ifa_hold(ifp);
3626                 addrconf_dad_stop(ifp, 1);
3627                 goto out;
3628         }
3629
3630         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3631                 goto out;
3632
3633         write_lock_bh(&idev->lock);
3634         if (idev->dead || !(idev->if_flags & IF_READY)) {
3635                 write_unlock_bh(&idev->lock);
3636                 goto out;
3637         }
3638
3639         spin_lock(&ifp->lock);
3640         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3641                 spin_unlock(&ifp->lock);
3642                 write_unlock_bh(&idev->lock);
3643                 goto out;
3644         }
3645
3646         if (ifp->dad_probes == 0) {
3647                 /*
3648                  * DAD was successful
3649                  */
3650
3651                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3652                 spin_unlock(&ifp->lock);
3653                 write_unlock_bh(&idev->lock);
3654
3655                 addrconf_dad_completed(ifp);
3656
3657                 goto out;
3658         }
3659
3660         ifp->dad_probes--;
3661         addrconf_mod_dad_work(ifp,
3662                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3663         spin_unlock(&ifp->lock);
3664         write_unlock_bh(&idev->lock);
3665
3666         /* send a neighbour solicitation for our addr */
3667         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3668         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3669 out:
3670         in6_ifa_put(ifp);
3671         rtnl_unlock();
3672 }
3673
3674 /* ifp->idev must be at least read locked */
3675 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3676 {
3677         struct inet6_ifaddr *ifpiter;
3678         struct inet6_dev *idev = ifp->idev;
3679
3680         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3681                 if (ifpiter->scope > IFA_LINK)
3682                         break;
3683                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3684                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3685                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3686                     IFA_F_PERMANENT)
3687                         return false;
3688         }
3689         return true;
3690 }
3691
3692 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3693 {
3694         struct net_device *dev = ifp->idev->dev;
3695         struct in6_addr lladdr;
3696         bool send_rs, send_mld;
3697
3698         addrconf_del_dad_work(ifp);
3699
3700         /*
3701          *      Configure the address for reception. Now it is valid.
3702          */
3703
3704         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3705
3706         /* If added prefix is link local and we are prepared to process
3707            router advertisements, start sending router solicitations.
3708          */
3709
3710         read_lock_bh(&ifp->idev->lock);
3711         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3712         send_rs = send_mld &&
3713                   ipv6_accept_ra(ifp->idev) &&
3714                   ifp->idev->cnf.rtr_solicits > 0 &&
3715                   (dev->flags&IFF_LOOPBACK) == 0;
3716         read_unlock_bh(&ifp->idev->lock);
3717
3718         /* While dad is in progress mld report's source address is in6_addrany.
3719          * Resend with proper ll now.
3720          */
3721         if (send_mld)
3722                 ipv6_mc_dad_complete(ifp->idev);
3723
3724         if (send_rs) {
3725                 /*
3726                  *      If a host as already performed a random delay
3727                  *      [...] as part of DAD [...] there is no need
3728                  *      to delay again before sending the first RS
3729                  */
3730                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3731                         return;
3732                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3733
3734                 write_lock_bh(&ifp->idev->lock);
3735                 spin_lock(&ifp->lock);
3736                 ifp->idev->rs_probes = 1;
3737                 ifp->idev->if_flags |= IF_RS_SENT;
3738                 addrconf_mod_rs_timer(ifp->idev,
3739                                       ifp->idev->cnf.rtr_solicit_interval);
3740                 spin_unlock(&ifp->lock);
3741                 write_unlock_bh(&ifp->idev->lock);
3742         }
3743 }
3744
3745 static void addrconf_dad_run(struct inet6_dev *idev)
3746 {
3747         struct inet6_ifaddr *ifp;
3748
3749         read_lock_bh(&idev->lock);
3750         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3751                 spin_lock(&ifp->lock);
3752                 if (ifp->flags & IFA_F_TENTATIVE &&
3753                     ifp->state == INET6_IFADDR_STATE_DAD)
3754                         addrconf_dad_kick(ifp);
3755                 spin_unlock(&ifp->lock);
3756         }
3757         read_unlock_bh(&idev->lock);
3758 }
3759
3760 #ifdef CONFIG_PROC_FS
3761 struct if6_iter_state {
3762         struct seq_net_private p;
3763         int bucket;
3764         int offset;
3765 };
3766
3767 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3768 {
3769         struct inet6_ifaddr *ifa = NULL;
3770         struct if6_iter_state *state = seq->private;
3771         struct net *net = seq_file_net(seq);
3772         int p = 0;
3773
3774         /* initial bucket if pos is 0 */
3775         if (pos == 0) {
3776                 state->bucket = 0;
3777                 state->offset = 0;
3778         }
3779
3780         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3781                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3782                                          addr_lst) {
3783                         if (!net_eq(dev_net(ifa->idev->dev), net))
3784                                 continue;
3785                         /* sync with offset */
3786                         if (p < state->offset) {
3787                                 p++;
3788                                 continue;
3789                         }
3790                         return ifa;
3791                 }
3792
3793                 /* prepare for next bucket */
3794                 state->offset = 0;
3795                 p = 0;
3796         }
3797         return NULL;
3798 }
3799
3800 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3801                                          struct inet6_ifaddr *ifa)
3802 {
3803         struct if6_iter_state *state = seq->private;
3804         struct net *net = seq_file_net(seq);
3805
3806         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3807                 if (!net_eq(dev_net(ifa->idev->dev), net))
3808                         continue;
3809                 state->offset++;
3810                 return ifa;
3811         }
3812
3813         state->offset = 0;
3814         while (++state->bucket < IN6_ADDR_HSIZE) {
3815                 hlist_for_each_entry_rcu_bh(ifa,
3816                                      &inet6_addr_lst[state->bucket], addr_lst) {
3817                         if (!net_eq(dev_net(ifa->idev->dev), net))
3818                                 continue;
3819                         return ifa;
3820                 }
3821         }
3822
3823         return NULL;
3824 }
3825
3826 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3827         __acquires(rcu_bh)
3828 {
3829         rcu_read_lock_bh();
3830         return if6_get_first(seq, *pos);
3831 }
3832
3833 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3834 {
3835         struct inet6_ifaddr *ifa;
3836
3837         ifa = if6_get_next(seq, v);
3838         ++*pos;
3839         return ifa;
3840 }
3841
3842 static void if6_seq_stop(struct seq_file *seq, void *v)
3843         __releases(rcu_bh)
3844 {
3845         rcu_read_unlock_bh();
3846 }
3847
3848 static int if6_seq_show(struct seq_file *seq, void *v)
3849 {
3850         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3851         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3852                    &ifp->addr,
3853                    ifp->idev->dev->ifindex,
3854                    ifp->prefix_len,
3855                    ifp->scope,
3856                    (u8) ifp->flags,
3857                    ifp->idev->dev->name);
3858         return 0;
3859 }
3860
3861 static const struct seq_operations if6_seq_ops = {
3862         .start  = if6_seq_start,
3863         .next   = if6_seq_next,
3864         .show   = if6_seq_show,
3865         .stop   = if6_seq_stop,
3866 };
3867
3868 static int if6_seq_open(struct inode *inode, struct file *file)
3869 {
3870         return seq_open_net(inode, file, &if6_seq_ops,
3871                             sizeof(struct if6_iter_state));
3872 }
3873
3874 static const struct file_operations if6_fops = {
3875         .owner          = THIS_MODULE,
3876         .open           = if6_seq_open,
3877         .read           = seq_read,
3878         .llseek         = seq_lseek,
3879         .release        = seq_release_net,
3880 };
3881
3882 static int __net_init if6_proc_net_init(struct net *net)
3883 {
3884         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3885                 return -ENOMEM;
3886         return 0;
3887 }
3888
3889 static void __net_exit if6_proc_net_exit(struct net *net)
3890 {
3891         remove_proc_entry("if_inet6", net->proc_net);
3892 }
3893
3894 static struct pernet_operations if6_proc_net_ops = {
3895         .init = if6_proc_net_init,
3896         .exit = if6_proc_net_exit,
3897 };
3898
3899 int __init if6_proc_init(void)
3900 {
3901         return register_pernet_subsys(&if6_proc_net_ops);
3902 }
3903
3904 void if6_proc_exit(void)
3905 {
3906         unregister_pernet_subsys(&if6_proc_net_ops);
3907 }
3908 #endif  /* CONFIG_PROC_FS */
3909
3910 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3911 /* Check if address is a home address configured on any interface. */
3912 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3913 {
3914         int ret = 0;
3915         struct inet6_ifaddr *ifp = NULL;
3916         unsigned int hash = inet6_addr_hash(addr);
3917
3918         rcu_read_lock_bh();
3919         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3920                 if (!net_eq(dev_net(ifp->idev->dev), net))
3921                         continue;
3922                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3923                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3924                         ret = 1;
3925                         break;
3926                 }
3927         }
3928         rcu_read_unlock_bh();
3929         return ret;
3930 }
3931 #endif
3932
3933 /*
3934  *      Periodic address status verification
3935  */
3936
3937 static void addrconf_verify_rtnl(void)
3938 {
3939         unsigned long now, next, next_sec, next_sched;
3940         struct inet6_ifaddr *ifp;
3941         int i;
3942
3943         ASSERT_RTNL();
3944
3945         rcu_read_lock_bh();
3946         now = jiffies;
3947         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3948
3949         cancel_delayed_work(&addr_chk_work);
3950
3951         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3952 restart:
3953                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3954                         unsigned long age;
3955
3956                         /* When setting preferred_lft to a value not zero or
3957                          * infinity, while valid_lft is infinity
3958                          * IFA_F_PERMANENT has a non-infinity life time.
3959                          */
3960                         if ((ifp->flags & IFA_F_PERMANENT) &&
3961                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
3962                                 continue;
3963
3964                         spin_lock(&ifp->lock);
3965                         /* We try to batch several events at once. */
3966                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3967
3968                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3969                             age >= ifp->valid_lft) {
3970                                 spin_unlock(&ifp->lock);
3971                                 in6_ifa_hold(ifp);
3972                                 ipv6_del_addr(ifp);
3973                                 goto restart;
3974                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3975                                 spin_unlock(&ifp->lock);
3976                                 continue;
3977                         } else if (age >= ifp->prefered_lft) {
3978                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3979                                 int deprecate = 0;
3980
3981                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3982                                         deprecate = 1;
3983                                         ifp->flags |= IFA_F_DEPRECATED;
3984                                 }
3985
3986                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3987                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3988                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3989
3990                                 spin_unlock(&ifp->lock);
3991
3992                                 if (deprecate) {
3993                                         in6_ifa_hold(ifp);
3994
3995                                         ipv6_ifa_notify(0, ifp);
3996                                         in6_ifa_put(ifp);
3997                                         goto restart;
3998                                 }
3999                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4000                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4001                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4002                                         ifp->idev->cnf.dad_transmits *
4003                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4004
4005                                 if (age >= ifp->prefered_lft - regen_advance) {
4006                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4007                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4008                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4009                                         if (!ifp->regen_count && ifpub) {
4010                                                 ifp->regen_count++;
4011                                                 in6_ifa_hold(ifp);
4012                                                 in6_ifa_hold(ifpub);
4013                                                 spin_unlock(&ifp->lock);
4014
4015                                                 spin_lock(&ifpub->lock);
4016                                                 ifpub->regen_count = 0;
4017                                                 spin_unlock(&ifpub->lock);
4018                                                 ipv6_create_tempaddr(ifpub, ifp);
4019                                                 in6_ifa_put(ifpub);
4020                                                 in6_ifa_put(ifp);
4021                                                 goto restart;
4022                                         }
4023                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4024                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4025                                 spin_unlock(&ifp->lock);
4026                         } else {
4027                                 /* ifp->prefered_lft <= ifp->valid_lft */
4028                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4029                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4030                                 spin_unlock(&ifp->lock);
4031                         }
4032                 }
4033         }
4034
4035         next_sec = round_jiffies_up(next);
4036         next_sched = next;
4037
4038         /* If rounded timeout is accurate enough, accept it. */
4039         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4040                 next_sched = next_sec;
4041
4042         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4043         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4044                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4045
4046         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4047               now, next, next_sec, next_sched);
4048         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4049         rcu_read_unlock_bh();
4050 }
4051
4052 static void addrconf_verify_work(struct work_struct *w)
4053 {
4054         rtnl_lock();
4055         addrconf_verify_rtnl();
4056         rtnl_unlock();
4057 }
4058
4059 static void addrconf_verify(void)
4060 {
4061         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4062 }
4063
4064 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4065                                      struct in6_addr **peer_pfx)
4066 {
4067         struct in6_addr *pfx = NULL;
4068
4069         *peer_pfx = NULL;
4070
4071         if (addr)
4072                 pfx = nla_data(addr);
4073
4074         if (local) {
4075                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4076                         *peer_pfx = pfx;
4077                 pfx = nla_data(local);
4078         }
4079
4080         return pfx;
4081 }
4082
4083 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4084         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4085         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4086         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4087         [IFA_FLAGS]             = { .len = sizeof(u32) },
4088 };
4089
4090 static int
4091 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4092 {
4093         struct net *net = sock_net(skb->sk);
4094         struct ifaddrmsg *ifm;
4095         struct nlattr *tb[IFA_MAX+1];
4096         struct in6_addr *pfx, *peer_pfx;
4097         u32 ifa_flags;
4098         int err;
4099
4100         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4101         if (err < 0)
4102                 return err;
4103
4104         ifm = nlmsg_data(nlh);
4105         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4106         if (!pfx)
4107                 return -EINVAL;
4108
4109         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4110
4111         /* We ignore other flags so far. */
4112         ifa_flags &= IFA_F_MANAGETEMPADDR;
4113
4114         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4115                               ifm->ifa_prefixlen);
4116 }
4117
4118 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4119                              u32 prefered_lft, u32 valid_lft)
4120 {
4121         u32 flags;
4122         clock_t expires;
4123         unsigned long timeout;
4124         bool was_managetempaddr;
4125         bool had_prefixroute;
4126
4127         ASSERT_RTNL();
4128
4129         if (!valid_lft || (prefered_lft > valid_lft))
4130                 return -EINVAL;
4131
4132         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4133             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4134                 return -EINVAL;
4135
4136         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4137         if (addrconf_finite_timeout(timeout)) {
4138                 expires = jiffies_to_clock_t(timeout * HZ);
4139                 valid_lft = timeout;
4140                 flags = RTF_EXPIRES;
4141         } else {
4142                 expires = 0;
4143                 flags = 0;
4144                 ifa_flags |= IFA_F_PERMANENT;
4145         }
4146
4147         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4148         if (addrconf_finite_timeout(timeout)) {
4149                 if (timeout == 0)
4150                         ifa_flags |= IFA_F_DEPRECATED;
4151                 prefered_lft = timeout;
4152         }
4153
4154         spin_lock_bh(&ifp->lock);
4155         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4156         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4157                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4158         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4159                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4160                         IFA_F_NOPREFIXROUTE);
4161         ifp->flags |= ifa_flags;
4162         ifp->tstamp = jiffies;
4163         ifp->valid_lft = valid_lft;
4164         ifp->prefered_lft = prefered_lft;
4165
4166         spin_unlock_bh(&ifp->lock);
4167         if (!(ifp->flags&IFA_F_TENTATIVE))
4168                 ipv6_ifa_notify(0, ifp);
4169
4170         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4171                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4172                                       expires, flags);
4173         } else if (had_prefixroute) {
4174                 enum cleanup_prefix_rt_t action;
4175                 unsigned long rt_expires;
4176
4177                 write_lock_bh(&ifp->idev->lock);
4178                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4179                 write_unlock_bh(&ifp->idev->lock);
4180
4181                 if (action != CLEANUP_PREFIX_RT_NOP) {
4182                         cleanup_prefix_route(ifp, rt_expires,
4183                                 action == CLEANUP_PREFIX_RT_DEL);
4184                 }
4185         }
4186
4187         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4188                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4189                         valid_lft = prefered_lft = 0;
4190                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4191                                  !was_managetempaddr, jiffies);
4192         }
4193
4194         addrconf_verify_rtnl();
4195
4196         return 0;
4197 }
4198
4199 static int
4200 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4201 {
4202         struct net *net = sock_net(skb->sk);
4203         struct ifaddrmsg *ifm;
4204         struct nlattr *tb[IFA_MAX+1];
4205         struct in6_addr *pfx, *peer_pfx;
4206         struct inet6_ifaddr *ifa;
4207         struct net_device *dev;
4208         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4209         u32 ifa_flags;
4210         int err;
4211
4212         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4213         if (err < 0)
4214                 return err;
4215
4216         ifm = nlmsg_data(nlh);
4217         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4218         if (!pfx)
4219                 return -EINVAL;
4220
4221         if (tb[IFA_CACHEINFO]) {
4222                 struct ifa_cacheinfo *ci;
4223
4224                 ci = nla_data(tb[IFA_CACHEINFO]);
4225                 valid_lft = ci->ifa_valid;
4226                 preferred_lft = ci->ifa_prefered;
4227         } else {
4228                 preferred_lft = INFINITY_LIFE_TIME;
4229                 valid_lft = INFINITY_LIFE_TIME;
4230         }
4231
4232         dev =  __dev_get_by_index(net, ifm->ifa_index);
4233         if (!dev)
4234                 return -ENODEV;
4235
4236         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4237
4238         /* We ignore other flags so far. */
4239         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4240                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4241
4242         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4243         if (!ifa) {
4244                 /*
4245                  * It would be best to check for !NLM_F_CREATE here but
4246                  * userspace already relies on not having to provide this.
4247                  */
4248                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4249                                       ifm->ifa_prefixlen, ifa_flags,
4250                                       preferred_lft, valid_lft);
4251         }
4252
4253         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4254             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4255                 err = -EEXIST;
4256         else
4257                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4258
4259         in6_ifa_put(ifa);
4260
4261         return err;
4262 }
4263
4264 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4265                           u8 scope, int ifindex)
4266 {
4267         struct ifaddrmsg *ifm;
4268
4269         ifm = nlmsg_data(nlh);
4270         ifm->ifa_family = AF_INET6;
4271         ifm->ifa_prefixlen = prefixlen;
4272         ifm->ifa_flags = flags;
4273         ifm->ifa_scope = scope;
4274         ifm->ifa_index = ifindex;
4275 }
4276
4277 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4278                          unsigned long tstamp, u32 preferred, u32 valid)
4279 {
4280         struct ifa_cacheinfo ci;
4281
4282         ci.cstamp = cstamp_delta(cstamp);
4283         ci.tstamp = cstamp_delta(tstamp);
4284         ci.ifa_prefered = preferred;
4285         ci.ifa_valid = valid;
4286
4287         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4288 }
4289
4290 static inline int rt_scope(int ifa_scope)
4291 {
4292         if (ifa_scope & IFA_HOST)
4293                 return RT_SCOPE_HOST;
4294         else if (ifa_scope & IFA_LINK)
4295                 return RT_SCOPE_LINK;
4296         else if (ifa_scope & IFA_SITE)
4297                 return RT_SCOPE_SITE;
4298         else
4299                 return RT_SCOPE_UNIVERSE;
4300 }
4301
4302 static inline int inet6_ifaddr_msgsize(void)
4303 {
4304         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4305                + nla_total_size(16) /* IFA_LOCAL */
4306                + nla_total_size(16) /* IFA_ADDRESS */
4307                + nla_total_size(sizeof(struct ifa_cacheinfo))
4308                + nla_total_size(4)  /* IFA_FLAGS */;
4309 }
4310
4311 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4312                              u32 portid, u32 seq, int event, unsigned int flags)
4313 {
4314         struct nlmsghdr  *nlh;
4315         u32 preferred, valid;
4316
4317         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4318         if (!nlh)
4319                 return -EMSGSIZE;
4320
4321         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4322                       ifa->idev->dev->ifindex);
4323
4324         if (!((ifa->flags&IFA_F_PERMANENT) &&
4325               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4326                 preferred = ifa->prefered_lft;
4327                 valid = ifa->valid_lft;
4328                 if (preferred != INFINITY_LIFE_TIME) {
4329                         long tval = (jiffies - ifa->tstamp)/HZ;
4330                         if (preferred > tval)
4331                                 preferred -= tval;
4332                         else
4333                                 preferred = 0;
4334                         if (valid != INFINITY_LIFE_TIME) {
4335                                 if (valid > tval)
4336                                         valid -= tval;
4337                                 else
4338                                         valid = 0;
4339                         }
4340                 }
4341         } else {
4342                 preferred = INFINITY_LIFE_TIME;
4343                 valid = INFINITY_LIFE_TIME;
4344         }
4345
4346         if (!ipv6_addr_any(&ifa->peer_addr)) {
4347                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4348                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4349                         goto error;
4350         } else
4351                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4352                         goto error;
4353
4354         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4355                 goto error;
4356
4357         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4358                 goto error;
4359
4360         nlmsg_end(skb, nlh);
4361         return 0;
4362
4363 error:
4364         nlmsg_cancel(skb, nlh);
4365         return -EMSGSIZE;
4366 }
4367
4368 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4369                                 u32 portid, u32 seq, int event, u16 flags)
4370 {
4371         struct nlmsghdr  *nlh;
4372         u8 scope = RT_SCOPE_UNIVERSE;
4373         int ifindex = ifmca->idev->dev->ifindex;
4374
4375         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4376                 scope = RT_SCOPE_SITE;
4377
4378         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4379         if (!nlh)
4380                 return -EMSGSIZE;
4381
4382         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4383         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4384             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4385                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4386                 nlmsg_cancel(skb, nlh);
4387                 return -EMSGSIZE;
4388         }
4389
4390         nlmsg_end(skb, nlh);
4391         return 0;
4392 }
4393
4394 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4395                                 u32 portid, u32 seq, int event, unsigned int flags)
4396 {
4397         struct nlmsghdr  *nlh;
4398         u8 scope = RT_SCOPE_UNIVERSE;
4399         int ifindex = ifaca->aca_idev->dev->ifindex;
4400
4401         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4402                 scope = RT_SCOPE_SITE;
4403
4404         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4405         if (!nlh)
4406                 return -EMSGSIZE;
4407
4408         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4409         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4410             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4411                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4412                 nlmsg_cancel(skb, nlh);
4413                 return -EMSGSIZE;
4414         }
4415
4416         nlmsg_end(skb, nlh);
4417         return 0;
4418 }
4419
4420 enum addr_type_t {
4421         UNICAST_ADDR,
4422         MULTICAST_ADDR,
4423         ANYCAST_ADDR,
4424 };
4425
4426 /* called with rcu_read_lock() */
4427 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4428                           struct netlink_callback *cb, enum addr_type_t type,
4429                           int s_ip_idx, int *p_ip_idx)
4430 {
4431         struct ifmcaddr6 *ifmca;
4432         struct ifacaddr6 *ifaca;
4433         int err = 1;
4434         int ip_idx = *p_ip_idx;
4435
4436         read_lock_bh(&idev->lock);
4437         switch (type) {
4438         case UNICAST_ADDR: {
4439                 struct inet6_ifaddr *ifa;
4440
4441                 /* unicast address incl. temp addr */
4442                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4443                         if (ip_idx < s_ip_idx)
4444                                 goto next;
4445                         err = inet6_fill_ifaddr(skb, ifa,
4446                                                 NETLINK_CB(cb->skb).portid,
4447                                                 cb->nlh->nlmsg_seq,
4448                                                 RTM_NEWADDR,
4449                                                 NLM_F_MULTI);
4450                         if (err < 0)
4451                                 break;
4452                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4453 next:
4454                         ip_idx++;
4455                 }
4456                 break;
4457         }
4458         case MULTICAST_ADDR:
4459                 /* multicast address */
4460                 for (ifmca = idev->mc_list; ifmca;
4461                      ifmca = ifmca->next, ip_idx++) {
4462                         if (ip_idx < s_ip_idx)
4463                                 continue;
4464                         err = inet6_fill_ifmcaddr(skb, ifmca,
4465                                                   NETLINK_CB(cb->skb).portid,
4466                                                   cb->nlh->nlmsg_seq,
4467                                                   RTM_GETMULTICAST,
4468                                                   NLM_F_MULTI);
4469                         if (err < 0)
4470                                 break;
4471                 }
4472                 break;
4473         case ANYCAST_ADDR:
4474                 /* anycast address */
4475                 for (ifaca = idev->ac_list; ifaca;
4476                      ifaca = ifaca->aca_next, ip_idx++) {
4477                         if (ip_idx < s_ip_idx)
4478                                 continue;
4479                         err = inet6_fill_ifacaddr(skb, ifaca,
4480                                                   NETLINK_CB(cb->skb).portid,
4481                                                   cb->nlh->nlmsg_seq,
4482                                                   RTM_GETANYCAST,
4483                                                   NLM_F_MULTI);
4484                         if (err < 0)
4485                                 break;
4486                 }
4487                 break;
4488         default:
4489                 break;
4490         }
4491         read_unlock_bh(&idev->lock);
4492         *p_ip_idx = ip_idx;
4493         return err;
4494 }
4495
4496 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4497                            enum addr_type_t type)
4498 {
4499         struct net *net = sock_net(skb->sk);
4500         int h, s_h;
4501         int idx, ip_idx;
4502         int s_idx, s_ip_idx;
4503         struct net_device *dev;
4504         struct inet6_dev *idev;
4505         struct hlist_head *head;
4506
4507         s_h = cb->args[0];
4508         s_idx = idx = cb->args[1];
4509         s_ip_idx = ip_idx = cb->args[2];
4510
4511         rcu_read_lock();
4512         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4513         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4514                 idx = 0;
4515                 head = &net->dev_index_head[h];
4516                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4517                         if (idx < s_idx)
4518                                 goto cont;
4519                         if (h > s_h || idx > s_idx)
4520                                 s_ip_idx = 0;
4521                         ip_idx = 0;
4522                         idev = __in6_dev_get(dev);
4523                         if (!idev)
4524                                 goto cont;
4525
4526                         if (in6_dump_addrs(idev, skb, cb, type,
4527                                            s_ip_idx, &ip_idx) < 0)
4528                                 goto done;
4529 cont:
4530                         idx++;
4531                 }
4532         }
4533 done:
4534         rcu_read_unlock();
4535         cb->args[0] = h;
4536         cb->args[1] = idx;
4537         cb->args[2] = ip_idx;
4538
4539         return skb->len;
4540 }
4541
4542 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4543 {
4544         enum addr_type_t type = UNICAST_ADDR;
4545
4546         return inet6_dump_addr(skb, cb, type);
4547 }
4548
4549 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4550 {
4551         enum addr_type_t type = MULTICAST_ADDR;
4552
4553         return inet6_dump_addr(skb, cb, type);
4554 }
4555
4556
4557 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4558 {
4559         enum addr_type_t type = ANYCAST_ADDR;
4560
4561         return inet6_dump_addr(skb, cb, type);
4562 }
4563
4564 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4565 {
4566         struct net *net = sock_net(in_skb->sk);
4567         struct ifaddrmsg *ifm;
4568         struct nlattr *tb[IFA_MAX+1];
4569         struct in6_addr *addr = NULL, *peer;
4570         struct net_device *dev = NULL;
4571         struct inet6_ifaddr *ifa;
4572         struct sk_buff *skb;
4573         int err;
4574
4575         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4576         if (err < 0)
4577                 goto errout;
4578
4579         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4580         if (!addr) {
4581                 err = -EINVAL;
4582                 goto errout;
4583         }
4584
4585         ifm = nlmsg_data(nlh);
4586         if (ifm->ifa_index)
4587                 dev = __dev_get_by_index(net, ifm->ifa_index);
4588
4589         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4590         if (!ifa) {
4591                 err = -EADDRNOTAVAIL;
4592                 goto errout;
4593         }
4594
4595         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4596         if (!skb) {
4597                 err = -ENOBUFS;
4598                 goto errout_ifa;
4599         }
4600
4601         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4602                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4603         if (err < 0) {
4604                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4605                 WARN_ON(err == -EMSGSIZE);
4606                 kfree_skb(skb);
4607                 goto errout_ifa;
4608         }
4609         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4610 errout_ifa:
4611         in6_ifa_put(ifa);
4612 errout:
4613         return err;
4614 }
4615
4616 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4617 {
4618         struct sk_buff *skb;
4619         struct net *net = dev_net(ifa->idev->dev);
4620         int err = -ENOBUFS;
4621
4622         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4623         if (!skb)
4624                 goto errout;
4625
4626         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4627         if (err < 0) {
4628                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4629                 WARN_ON(err == -EMSGSIZE);
4630                 kfree_skb(skb);
4631                 goto errout;
4632         }
4633         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4634         return;
4635 errout:
4636         if (err < 0)
4637                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4638 }
4639
4640 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4641                                 __s32 *array, int bytes)
4642 {
4643         BUG_ON(bytes < (DEVCONF_MAX * 4));
4644
4645         memset(array, 0, bytes);
4646         array[DEVCONF_FORWARDING] = cnf->forwarding;
4647         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4648         array[DEVCONF_MTU6] = cnf->mtu6;
4649         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4650         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4651         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4652         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4653         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4654         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4655                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4656         array[DEVCONF_RTR_SOLICIT_DELAY] =
4657                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4658         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4659         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4660                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4661         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4662                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4663         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4664         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4665         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4666         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4667         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4668         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4669         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4670         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4671         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4672 #ifdef CONFIG_IPV6_ROUTER_PREF
4673         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4674         array[DEVCONF_RTR_PROBE_INTERVAL] =
4675                 jiffies_to_msecs(cnf->rtr_probe_interval);
4676 #ifdef CONFIG_IPV6_ROUTE_INFO
4677         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4678 #endif
4679 #endif
4680         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4681         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4682 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4683         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4684         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4685 #endif
4686 #ifdef CONFIG_IPV6_MROUTE
4687         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4688 #endif
4689         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4690         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4691         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4692         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4693         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4694         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4695         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4696         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4697         /* we omit DEVCONF_STABLE_SECRET for now */
4698         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4699 }
4700
4701 static inline size_t inet6_ifla6_size(void)
4702 {
4703         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4704              + nla_total_size(sizeof(struct ifla_cacheinfo))
4705              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4706              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4707              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4708              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4709 }
4710
4711 static inline size_t inet6_if_nlmsg_size(void)
4712 {
4713         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4714                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4715                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4716                + nla_total_size(4) /* IFLA_MTU */
4717                + nla_total_size(4) /* IFLA_LINK */
4718                + nla_total_size(1) /* IFLA_OPERSTATE */
4719                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4720 }
4721
4722 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4723                                       int items, int bytes)
4724 {
4725         int i;
4726         int pad = bytes - sizeof(u64) * items;
4727         BUG_ON(pad < 0);
4728
4729         /* Use put_unaligned() because stats may not be aligned for u64. */
4730         put_unaligned(items, &stats[0]);
4731         for (i = 1; i < items; i++)
4732                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4733
4734         memset(&stats[items], 0, pad);
4735 }
4736
4737 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4738                                         int bytes, size_t syncpoff)
4739 {
4740         int i, c;
4741         u64 buff[IPSTATS_MIB_MAX];
4742         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4743
4744         BUG_ON(pad < 0);
4745
4746         memset(buff, 0, sizeof(buff));
4747         buff[0] = IPSTATS_MIB_MAX;
4748
4749         for_each_possible_cpu(c) {
4750                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4751                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4752         }
4753
4754         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4755         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4756 }
4757
4758 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4759                              int bytes)
4760 {
4761         switch (attrtype) {
4762         case IFLA_INET6_STATS:
4763                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4764                                      offsetof(struct ipstats_mib, syncp));
4765                 break;
4766         case IFLA_INET6_ICMP6STATS:
4767                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4768                 break;
4769         }
4770 }
4771
4772 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4773                                   u32 ext_filter_mask)
4774 {
4775         struct nlattr *nla;
4776         struct ifla_cacheinfo ci;
4777
4778         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4779                 goto nla_put_failure;
4780         ci.max_reasm_len = IPV6_MAXPLEN;
4781         ci.tstamp = cstamp_delta(idev->tstamp);
4782         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4783         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4784         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4785                 goto nla_put_failure;
4786         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4787         if (!nla)
4788                 goto nla_put_failure;
4789         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4790
4791         /* XXX - MC not implemented */
4792
4793         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4794                 return 0;
4795
4796         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4797         if (!nla)
4798                 goto nla_put_failure;
4799         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4800
4801         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4802         if (!nla)
4803                 goto nla_put_failure;
4804         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4805
4806         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4807         if (!nla)
4808                 goto nla_put_failure;
4809
4810         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4811                 goto nla_put_failure;
4812
4813         read_lock_bh(&idev->lock);
4814         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4815         read_unlock_bh(&idev->lock);
4816
4817         return 0;
4818
4819 nla_put_failure:
4820         return -EMSGSIZE;
4821 }
4822
4823 static size_t inet6_get_link_af_size(const struct net_device *dev,
4824                                      u32 ext_filter_mask)
4825 {
4826         if (!__in6_dev_get(dev))
4827                 return 0;
4828
4829         return inet6_ifla6_size();
4830 }
4831
4832 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4833                               u32 ext_filter_mask)
4834 {
4835         struct inet6_dev *idev = __in6_dev_get(dev);
4836
4837         if (!idev)
4838                 return -ENODATA;
4839
4840         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4841                 return -EMSGSIZE;
4842
4843         return 0;
4844 }
4845
4846 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4847 {
4848         struct inet6_ifaddr *ifp;
4849         struct net_device *dev = idev->dev;
4850         bool update_rs = false;
4851         struct in6_addr ll_addr;
4852
4853         ASSERT_RTNL();
4854
4855         if (!token)
4856                 return -EINVAL;
4857         if (ipv6_addr_any(token))
4858                 return -EINVAL;
4859         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4860                 return -EINVAL;
4861         if (!ipv6_accept_ra(idev))
4862                 return -EINVAL;
4863         if (idev->cnf.rtr_solicits <= 0)
4864                 return -EINVAL;
4865
4866         write_lock_bh(&idev->lock);
4867
4868         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4869         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4870
4871         write_unlock_bh(&idev->lock);
4872
4873         if (!idev->dead && (idev->if_flags & IF_READY) &&
4874             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4875                              IFA_F_OPTIMISTIC)) {
4876
4877                 /* If we're not ready, then normal ifup will take care
4878                  * of this. Otherwise, we need to request our rs here.
4879                  */
4880                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4881                 update_rs = true;
4882         }
4883
4884         write_lock_bh(&idev->lock);
4885
4886         if (update_rs) {
4887                 idev->if_flags |= IF_RS_SENT;
4888                 idev->rs_probes = 1;
4889                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4890         }
4891
4892         /* Well, that's kinda nasty ... */
4893         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4894                 spin_lock(&ifp->lock);
4895                 if (ifp->tokenized) {
4896                         ifp->valid_lft = 0;
4897                         ifp->prefered_lft = 0;
4898                 }
4899                 spin_unlock(&ifp->lock);
4900         }
4901
4902         write_unlock_bh(&idev->lock);
4903         inet6_ifinfo_notify(RTM_NEWLINK, idev);
4904         addrconf_verify_rtnl();
4905         return 0;
4906 }
4907
4908 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4909         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
4910         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
4911 };
4912
4913 static int inet6_validate_link_af(const struct net_device *dev,
4914                                   const struct nlattr *nla)
4915 {
4916         struct nlattr *tb[IFLA_INET6_MAX + 1];
4917
4918         if (dev && !__in6_dev_get(dev))
4919                 return -EAFNOSUPPORT;
4920
4921         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4922 }
4923
4924 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4925 {
4926         int err = -EINVAL;
4927         struct inet6_dev *idev = __in6_dev_get(dev);
4928         struct nlattr *tb[IFLA_INET6_MAX + 1];
4929
4930         if (!idev)
4931                 return -EAFNOSUPPORT;
4932
4933         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4934                 BUG();
4935
4936         if (tb[IFLA_INET6_TOKEN]) {
4937                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4938                 if (err)
4939                         return err;
4940         }
4941
4942         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4943                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4944
4945                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4946                     mode != IN6_ADDR_GEN_MODE_NONE &&
4947                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4948                         return -EINVAL;
4949
4950                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4951                     !idev->cnf.stable_secret.initialized &&
4952                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4953                         return -EINVAL;
4954
4955                 idev->addr_gen_mode = mode;
4956                 err = 0;
4957         }
4958
4959         return err;
4960 }
4961
4962 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4963                              u32 portid, u32 seq, int event, unsigned int flags)
4964 {
4965         struct net_device *dev = idev->dev;
4966         struct ifinfomsg *hdr;
4967         struct nlmsghdr *nlh;
4968         void *protoinfo;
4969
4970         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4971         if (!nlh)
4972                 return -EMSGSIZE;
4973
4974         hdr = nlmsg_data(nlh);
4975         hdr->ifi_family = AF_INET6;
4976         hdr->__ifi_pad = 0;
4977         hdr->ifi_type = dev->type;
4978         hdr->ifi_index = dev->ifindex;
4979         hdr->ifi_flags = dev_get_flags(dev);
4980         hdr->ifi_change = 0;
4981
4982         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4983             (dev->addr_len &&
4984              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4985             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4986             (dev->ifindex != dev_get_iflink(dev) &&
4987              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4988             nla_put_u8(skb, IFLA_OPERSTATE,
4989                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4990                 goto nla_put_failure;
4991         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4992         if (!protoinfo)
4993                 goto nla_put_failure;
4994
4995         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4996                 goto nla_put_failure;
4997
4998         nla_nest_end(skb, protoinfo);
4999         nlmsg_end(skb, nlh);
5000         return 0;
5001
5002 nla_put_failure:
5003         nlmsg_cancel(skb, nlh);
5004         return -EMSGSIZE;
5005 }
5006
5007 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5008 {
5009         struct net *net = sock_net(skb->sk);
5010         int h, s_h;
5011         int idx = 0, s_idx;
5012         struct net_device *dev;
5013         struct inet6_dev *idev;
5014         struct hlist_head *head;
5015
5016         s_h = cb->args[0];
5017         s_idx = cb->args[1];
5018
5019         rcu_read_lock();
5020         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5021                 idx = 0;
5022                 head = &net->dev_index_head[h];
5023                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5024                         if (idx < s_idx)
5025                                 goto cont;
5026                         idev = __in6_dev_get(dev);
5027                         if (!idev)
5028                                 goto cont;
5029                         if (inet6_fill_ifinfo(skb, idev,
5030                                               NETLINK_CB(cb->skb).portid,
5031                                               cb->nlh->nlmsg_seq,
5032                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5033                                 goto out;
5034 cont:
5035                         idx++;
5036                 }
5037         }
5038 out:
5039         rcu_read_unlock();
5040         cb->args[1] = idx;
5041         cb->args[0] = h;
5042
5043         return skb->len;
5044 }
5045
5046 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5047 {
5048         struct sk_buff *skb;
5049         struct net *net = dev_net(idev->dev);
5050         int err = -ENOBUFS;
5051
5052         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5053         if (!skb)
5054                 goto errout;
5055
5056         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5057         if (err < 0) {
5058                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5059                 WARN_ON(err == -EMSGSIZE);
5060                 kfree_skb(skb);
5061                 goto errout;
5062         }
5063         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5064         return;
5065 errout:
5066         if (err < 0)
5067                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5068 }
5069
5070 static inline size_t inet6_prefix_nlmsg_size(void)
5071 {
5072         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5073                + nla_total_size(sizeof(struct in6_addr))
5074                + nla_total_size(sizeof(struct prefix_cacheinfo));
5075 }
5076
5077 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5078                              struct prefix_info *pinfo, u32 portid, u32 seq,
5079                              int event, unsigned int flags)
5080 {
5081         struct prefixmsg *pmsg;
5082         struct nlmsghdr *nlh;
5083         struct prefix_cacheinfo ci;
5084
5085         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5086         if (!nlh)
5087                 return -EMSGSIZE;
5088
5089         pmsg = nlmsg_data(nlh);
5090         pmsg->prefix_family = AF_INET6;
5091         pmsg->prefix_pad1 = 0;
5092         pmsg->prefix_pad2 = 0;
5093         pmsg->prefix_ifindex = idev->dev->ifindex;
5094         pmsg->prefix_len = pinfo->prefix_len;
5095         pmsg->prefix_type = pinfo->type;
5096         pmsg->prefix_pad3 = 0;
5097         pmsg->prefix_flags = 0;
5098         if (pinfo->onlink)
5099                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5100         if (pinfo->autoconf)
5101                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5102
5103         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5104                 goto nla_put_failure;
5105         ci.preferred_time = ntohl(pinfo->prefered);
5106         ci.valid_time = ntohl(pinfo->valid);
5107         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5108                 goto nla_put_failure;
5109         nlmsg_end(skb, nlh);
5110         return 0;
5111
5112 nla_put_failure:
5113         nlmsg_cancel(skb, nlh);
5114         return -EMSGSIZE;
5115 }
5116
5117 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5118                          struct prefix_info *pinfo)
5119 {
5120         struct sk_buff *skb;
5121         struct net *net = dev_net(idev->dev);
5122         int err = -ENOBUFS;
5123
5124         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5125         if (!skb)
5126                 goto errout;
5127
5128         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5129         if (err < 0) {
5130                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5131                 WARN_ON(err == -EMSGSIZE);
5132                 kfree_skb(skb);
5133                 goto errout;
5134         }
5135         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5136         return;
5137 errout:
5138         if (err < 0)
5139                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5140 }
5141
5142 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5143 {
5144         struct net *net = dev_net(ifp->idev->dev);
5145
5146         if (event)
5147                 ASSERT_RTNL();
5148
5149         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5150
5151         switch (event) {
5152         case RTM_NEWADDR:
5153                 /*
5154                  * If the address was optimistic
5155                  * we inserted the route at the start of
5156                  * our DAD process, so we don't need
5157                  * to do it again
5158                  */
5159                 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5160                         ip6_ins_rt(ifp->rt);
5161                 if (ifp->idev->cnf.forwarding)
5162                         addrconf_join_anycast(ifp);
5163                 if (!ipv6_addr_any(&ifp->peer_addr))
5164                         addrconf_prefix_route(&ifp->peer_addr, 128,
5165                                               ifp->idev->dev, 0, 0);
5166                 break;
5167         case RTM_DELADDR:
5168                 if (ifp->idev->cnf.forwarding)
5169                         addrconf_leave_anycast(ifp);
5170                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5171                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5172                         struct rt6_info *rt;
5173
5174                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5175                                                        ifp->idev->dev, 0, 0);
5176                         if (rt)
5177                                 ip6_del_rt(rt);
5178                 }
5179                 dst_hold(&ifp->rt->dst);
5180
5181                 ip6_del_rt(ifp->rt);
5182
5183                 rt_genid_bump_ipv6(net);
5184                 break;
5185         }
5186         atomic_inc(&net->ipv6.dev_addr_genid);
5187 }
5188
5189 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5190 {
5191         rcu_read_lock_bh();
5192         if (likely(ifp->idev->dead == 0))
5193                 __ipv6_ifa_notify(event, ifp);
5194         rcu_read_unlock_bh();
5195 }
5196
5197 #ifdef CONFIG_SYSCTL
5198
5199 static
5200 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5201                            void __user *buffer, size_t *lenp, loff_t *ppos)
5202 {
5203         int *valp = ctl->data;
5204         int val = *valp;
5205         loff_t pos = *ppos;
5206         struct ctl_table lctl;
5207         int ret;
5208
5209         /*
5210          * ctl->data points to idev->cnf.forwarding, we should
5211          * not modify it until we get the rtnl lock.
5212          */
5213         lctl = *ctl;
5214         lctl.data = &val;
5215
5216         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5217
5218         if (write)
5219                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5220         if (ret)
5221                 *ppos = pos;
5222         return ret;
5223 }
5224
5225 static
5226 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5227                         void __user *buffer, size_t *lenp, loff_t *ppos)
5228 {
5229         struct inet6_dev *idev = ctl->extra1;
5230         int min_mtu = IPV6_MIN_MTU;
5231         struct ctl_table lctl;
5232
5233         lctl = *ctl;
5234         lctl.extra1 = &min_mtu;
5235         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5236
5237         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5238 }
5239
5240 static void dev_disable_change(struct inet6_dev *idev)
5241 {
5242         struct netdev_notifier_info info;
5243
5244         if (!idev || !idev->dev)
5245                 return;
5246
5247         netdev_notifier_info_init(&info, idev->dev);
5248         if (idev->cnf.disable_ipv6)
5249                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5250         else
5251                 addrconf_notify(NULL, NETDEV_UP, &info);
5252 }
5253
5254 static void addrconf_disable_change(struct net *net, __s32 newf)
5255 {
5256         struct net_device *dev;
5257         struct inet6_dev *idev;
5258
5259         for_each_netdev(net, dev) {
5260                 idev = __in6_dev_get(dev);
5261                 if (idev) {
5262                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5263                         idev->cnf.disable_ipv6 = newf;
5264                         if (changed)
5265                                 dev_disable_change(idev);
5266                 }
5267         }
5268 }
5269
5270 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5271 {
5272         struct net *net;
5273         int old;
5274
5275         if (!rtnl_trylock())
5276                 return restart_syscall();
5277
5278         net = (struct net *)table->extra2;
5279         old = *p;
5280         *p = newf;
5281
5282         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5283                 rtnl_unlock();
5284                 return 0;
5285         }
5286
5287         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5288                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5289                 addrconf_disable_change(net, newf);
5290         } else if ((!newf) ^ (!old))
5291                 dev_disable_change((struct inet6_dev *)table->extra1);
5292
5293         rtnl_unlock();
5294         return 0;
5295 }
5296
5297 static
5298 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5299                             void __user *buffer, size_t *lenp, loff_t *ppos)
5300 {
5301         int *valp = ctl->data;
5302         int val = *valp;
5303         loff_t pos = *ppos;
5304         struct ctl_table lctl;
5305         int ret;
5306
5307         /*
5308          * ctl->data points to idev->cnf.disable_ipv6, we should
5309          * not modify it until we get the rtnl lock.
5310          */
5311         lctl = *ctl;
5312         lctl.data = &val;
5313
5314         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5315
5316         if (write)
5317                 ret = addrconf_disable_ipv6(ctl, valp, val);
5318         if (ret)
5319                 *ppos = pos;
5320         return ret;
5321 }
5322
5323 static
5324 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5325                               void __user *buffer, size_t *lenp, loff_t *ppos)
5326 {
5327         int *valp = ctl->data;
5328         int ret;
5329         int old, new;
5330
5331         old = *valp;
5332         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5333         new = *valp;
5334
5335         if (write && old != new) {
5336                 struct net *net = ctl->extra2;
5337
5338                 if (!rtnl_trylock())
5339                         return restart_syscall();
5340
5341                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5342                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5343                                                      NETCONFA_IFINDEX_DEFAULT,
5344                                                      net->ipv6.devconf_dflt);
5345                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5346                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5347                                                      NETCONFA_IFINDEX_ALL,
5348                                                      net->ipv6.devconf_all);
5349                 else {
5350                         struct inet6_dev *idev = ctl->extra1;
5351
5352                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5353                                                      idev->dev->ifindex,
5354                                                      &idev->cnf);
5355                 }
5356                 rtnl_unlock();
5357         }
5358
5359         return ret;
5360 }
5361
5362 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5363                                          void __user *buffer, size_t *lenp,
5364                                          loff_t *ppos)
5365 {
5366         int err;
5367         struct in6_addr addr;
5368         char str[IPV6_MAX_STRLEN];
5369         struct ctl_table lctl = *ctl;
5370         struct net *net = ctl->extra2;
5371         struct ipv6_stable_secret *secret = ctl->data;
5372
5373         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5374                 return -EIO;
5375
5376         lctl.maxlen = IPV6_MAX_STRLEN;
5377         lctl.data = str;
5378
5379         if (!rtnl_trylock())
5380                 return restart_syscall();
5381
5382         if (!write && !secret->initialized) {
5383                 err = -EIO;
5384                 goto out;
5385         }
5386
5387         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5388         if (err >= sizeof(str)) {
5389                 err = -EIO;
5390                 goto out;
5391         }
5392
5393         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5394         if (err || !write)
5395                 goto out;
5396
5397         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5398                 err = -EIO;
5399                 goto out;
5400         }
5401
5402         secret->initialized = true;
5403         secret->secret = addr;
5404
5405         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5406                 struct net_device *dev;
5407
5408                 for_each_netdev(net, dev) {
5409                         struct inet6_dev *idev = __in6_dev_get(dev);
5410
5411                         if (idev) {
5412                                 idev->addr_gen_mode =
5413                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5414                         }
5415                 }
5416         } else {
5417                 struct inet6_dev *idev = ctl->extra1;
5418
5419                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5420         }
5421
5422 out:
5423         rtnl_unlock();
5424
5425         return err;
5426 }
5427
5428 static
5429 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5430                                                 int write,
5431                                                 void __user *buffer,
5432                                                 size_t *lenp,
5433                                                 loff_t *ppos)
5434 {
5435         int *valp = ctl->data;
5436         int val = *valp;
5437         loff_t pos = *ppos;
5438         struct ctl_table lctl;
5439         int ret;
5440
5441         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5442          * we should not modify it until we get the rtnl lock.
5443          */
5444         lctl = *ctl;
5445         lctl.data = &val;
5446
5447         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5448
5449         if (write)
5450                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5451         if (ret)
5452                 *ppos = pos;
5453         return ret;
5454 }
5455
5456 static struct addrconf_sysctl_table
5457 {
5458         struct ctl_table_header *sysctl_header;
5459         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5460 } addrconf_sysctl __read_mostly = {
5461         .sysctl_header = NULL,
5462         .addrconf_vars = {
5463                 {
5464                         .procname       = "forwarding",
5465                         .data           = &ipv6_devconf.forwarding,
5466                         .maxlen         = sizeof(int),
5467                         .mode           = 0644,
5468                         .proc_handler   = addrconf_sysctl_forward,
5469                 },
5470                 {
5471                         .procname       = "hop_limit",
5472                         .data           = &ipv6_devconf.hop_limit,
5473                         .maxlen         = sizeof(int),
5474                         .mode           = 0644,
5475                         .proc_handler   = proc_dointvec,
5476                 },
5477                 {
5478                         .procname       = "mtu",
5479                         .data           = &ipv6_devconf.mtu6,
5480                         .maxlen         = sizeof(int),
5481                         .mode           = 0644,
5482                         .proc_handler   = addrconf_sysctl_mtu,
5483                 },
5484                 {
5485                         .procname       = "accept_ra",
5486                         .data           = &ipv6_devconf.accept_ra,
5487                         .maxlen         = sizeof(int),
5488                         .mode           = 0644,
5489                         .proc_handler   = proc_dointvec,
5490                 },
5491                 {
5492                         .procname       = "accept_redirects",
5493                         .data           = &ipv6_devconf.accept_redirects,
5494                         .maxlen         = sizeof(int),
5495                         .mode           = 0644,
5496                         .proc_handler   = proc_dointvec,
5497                 },
5498                 {
5499                         .procname       = "autoconf",
5500                         .data           = &ipv6_devconf.autoconf,
5501                         .maxlen         = sizeof(int),
5502                         .mode           = 0644,
5503                         .proc_handler   = proc_dointvec,
5504                 },
5505                 {
5506                         .procname       = "dad_transmits",
5507                         .data           = &ipv6_devconf.dad_transmits,
5508                         .maxlen         = sizeof(int),
5509                         .mode           = 0644,
5510                         .proc_handler   = proc_dointvec,
5511                 },
5512                 {
5513                         .procname       = "router_solicitations",
5514                         .data           = &ipv6_devconf.rtr_solicits,
5515                         .maxlen         = sizeof(int),
5516                         .mode           = 0644,
5517                         .proc_handler   = proc_dointvec,
5518                 },
5519                 {
5520                         .procname       = "router_solicitation_interval",
5521                         .data           = &ipv6_devconf.rtr_solicit_interval,
5522                         .maxlen         = sizeof(int),
5523                         .mode           = 0644,
5524                         .proc_handler   = proc_dointvec_jiffies,
5525                 },
5526                 {
5527                         .procname       = "router_solicitation_delay",
5528                         .data           = &ipv6_devconf.rtr_solicit_delay,
5529                         .maxlen         = sizeof(int),
5530                         .mode           = 0644,
5531                         .proc_handler   = proc_dointvec_jiffies,
5532                 },
5533                 {
5534                         .procname       = "force_mld_version",
5535                         .data           = &ipv6_devconf.force_mld_version,
5536                         .maxlen         = sizeof(int),
5537                         .mode           = 0644,
5538                         .proc_handler   = proc_dointvec,
5539                 },
5540                 {
5541                         .procname       = "mldv1_unsolicited_report_interval",
5542                         .data           =
5543                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
5544                         .maxlen         = sizeof(int),
5545                         .mode           = 0644,
5546                         .proc_handler   = proc_dointvec_ms_jiffies,
5547                 },
5548                 {
5549                         .procname       = "mldv2_unsolicited_report_interval",
5550                         .data           =
5551                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
5552                         .maxlen         = sizeof(int),
5553                         .mode           = 0644,
5554                         .proc_handler   = proc_dointvec_ms_jiffies,
5555                 },
5556                 {
5557                         .procname       = "use_tempaddr",
5558                         .data           = &ipv6_devconf.use_tempaddr,
5559                         .maxlen         = sizeof(int),
5560                         .mode           = 0644,
5561                         .proc_handler   = proc_dointvec,
5562                 },
5563                 {
5564                         .procname       = "temp_valid_lft",
5565                         .data           = &ipv6_devconf.temp_valid_lft,
5566                         .maxlen         = sizeof(int),
5567                         .mode           = 0644,
5568                         .proc_handler   = proc_dointvec,
5569                 },
5570                 {
5571                         .procname       = "temp_prefered_lft",
5572                         .data           = &ipv6_devconf.temp_prefered_lft,
5573                         .maxlen         = sizeof(int),
5574                         .mode           = 0644,
5575                         .proc_handler   = proc_dointvec,
5576                 },
5577                 {
5578                         .procname       = "regen_max_retry",
5579                         .data           = &ipv6_devconf.regen_max_retry,
5580                         .maxlen         = sizeof(int),
5581                         .mode           = 0644,
5582                         .proc_handler   = proc_dointvec,
5583                 },
5584                 {
5585                         .procname       = "max_desync_factor",
5586                         .data           = &ipv6_devconf.max_desync_factor,
5587                         .maxlen         = sizeof(int),
5588                         .mode           = 0644,
5589                         .proc_handler   = proc_dointvec,
5590                 },
5591                 {
5592                         .procname       = "max_addresses",
5593                         .data           = &ipv6_devconf.max_addresses,
5594                         .maxlen         = sizeof(int),
5595                         .mode           = 0644,
5596                         .proc_handler   = proc_dointvec,
5597                 },
5598                 {
5599                         .procname       = "accept_ra_defrtr",
5600                         .data           = &ipv6_devconf.accept_ra_defrtr,
5601                         .maxlen         = sizeof(int),
5602                         .mode           = 0644,
5603                         .proc_handler   = proc_dointvec,
5604                 },
5605                 {
5606                         .procname       = "accept_ra_min_hop_limit",
5607                         .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5608                         .maxlen         = sizeof(int),
5609                         .mode           = 0644,
5610                         .proc_handler   = proc_dointvec,
5611                 },
5612                 {
5613                         .procname       = "accept_ra_pinfo",
5614                         .data           = &ipv6_devconf.accept_ra_pinfo,
5615                         .maxlen         = sizeof(int),
5616                         .mode           = 0644,
5617                         .proc_handler   = proc_dointvec,
5618                 },
5619 #ifdef CONFIG_IPV6_ROUTER_PREF
5620                 {
5621                         .procname       = "accept_ra_rtr_pref",
5622                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
5623                         .maxlen         = sizeof(int),
5624                         .mode           = 0644,
5625                         .proc_handler   = proc_dointvec,
5626                 },
5627                 {
5628                         .procname       = "router_probe_interval",
5629                         .data           = &ipv6_devconf.rtr_probe_interval,
5630                         .maxlen         = sizeof(int),
5631                         .mode           = 0644,
5632                         .proc_handler   = proc_dointvec_jiffies,
5633                 },
5634 #ifdef CONFIG_IPV6_ROUTE_INFO
5635                 {
5636                         .procname       = "accept_ra_rt_info_max_plen",
5637                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5638                         .maxlen         = sizeof(int),
5639                         .mode           = 0644,
5640                         .proc_handler   = proc_dointvec,
5641                 },
5642 #endif
5643 #endif
5644                 {
5645                         .procname       = "proxy_ndp",
5646                         .data           = &ipv6_devconf.proxy_ndp,
5647                         .maxlen         = sizeof(int),
5648                         .mode           = 0644,
5649                         .proc_handler   = addrconf_sysctl_proxy_ndp,
5650                 },
5651                 {
5652                         .procname       = "accept_source_route",
5653                         .data           = &ipv6_devconf.accept_source_route,
5654                         .maxlen         = sizeof(int),
5655                         .mode           = 0644,
5656                         .proc_handler   = proc_dointvec,
5657                 },
5658 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5659                 {
5660                         .procname       = "optimistic_dad",
5661                         .data           = &ipv6_devconf.optimistic_dad,
5662                         .maxlen         = sizeof(int),
5663                         .mode           = 0644,
5664                         .proc_handler   = proc_dointvec,
5665
5666                 },
5667                 {
5668                         .procname       = "use_optimistic",
5669                         .data           = &ipv6_devconf.use_optimistic,
5670                         .maxlen         = sizeof(int),
5671                         .mode           = 0644,
5672                         .proc_handler   = proc_dointvec,
5673
5674                 },
5675 #endif
5676 #ifdef CONFIG_IPV6_MROUTE
5677                 {
5678                         .procname       = "mc_forwarding",
5679                         .data           = &ipv6_devconf.mc_forwarding,
5680                         .maxlen         = sizeof(int),
5681                         .mode           = 0444,
5682                         .proc_handler   = proc_dointvec,
5683                 },
5684 #endif
5685                 {
5686                         .procname       = "disable_ipv6",
5687                         .data           = &ipv6_devconf.disable_ipv6,
5688                         .maxlen         = sizeof(int),
5689                         .mode           = 0644,
5690                         .proc_handler   = addrconf_sysctl_disable,
5691                 },
5692                 {
5693                         .procname       = "accept_dad",
5694                         .data           = &ipv6_devconf.accept_dad,
5695                         .maxlen         = sizeof(int),
5696                         .mode           = 0644,
5697                         .proc_handler   = proc_dointvec,
5698                 },
5699                 {
5700                         .procname       = "force_tllao",
5701                         .data           = &ipv6_devconf.force_tllao,
5702                         .maxlen         = sizeof(int),
5703                         .mode           = 0644,
5704                         .proc_handler   = proc_dointvec
5705                 },
5706                 {
5707                         .procname       = "ndisc_notify",
5708                         .data           = &ipv6_devconf.ndisc_notify,
5709                         .maxlen         = sizeof(int),
5710                         .mode           = 0644,
5711                         .proc_handler   = proc_dointvec
5712                 },
5713                 {
5714                         .procname       = "suppress_frag_ndisc",
5715                         .data           = &ipv6_devconf.suppress_frag_ndisc,
5716                         .maxlen         = sizeof(int),
5717                         .mode           = 0644,
5718                         .proc_handler   = proc_dointvec
5719                 },
5720                 {
5721                         .procname       = "accept_ra_from_local",
5722                         .data           = &ipv6_devconf.accept_ra_from_local,
5723                         .maxlen         = sizeof(int),
5724                         .mode           = 0644,
5725                         .proc_handler   = proc_dointvec,
5726                 },
5727                 {
5728                         .procname       = "accept_ra_mtu",
5729                         .data           = &ipv6_devconf.accept_ra_mtu,
5730                         .maxlen         = sizeof(int),
5731                         .mode           = 0644,
5732                         .proc_handler   = proc_dointvec,
5733                 },
5734                 {
5735                         .procname       = "stable_secret",
5736                         .data           = &ipv6_devconf.stable_secret,
5737                         .maxlen         = IPV6_MAX_STRLEN,
5738                         .mode           = 0600,
5739                         .proc_handler   = addrconf_sysctl_stable_secret,
5740                 },
5741                 {
5742                         .procname       = "use_oif_addrs_only",
5743                         .data           = &ipv6_devconf.use_oif_addrs_only,
5744                         .maxlen         = sizeof(int),
5745                         .mode           = 0644,
5746                         .proc_handler   = proc_dointvec,
5747                 },
5748                 {
5749                         .procname       = "ignore_routes_with_linkdown",
5750                         .data           = &ipv6_devconf.ignore_routes_with_linkdown,
5751                         .maxlen         = sizeof(int),
5752                         .mode           = 0644,
5753                         .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
5754                 },
5755                 {
5756                         /* sentinel */
5757                 }
5758         },
5759 };
5760
5761 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5762                 struct inet6_dev *idev, struct ipv6_devconf *p)
5763 {
5764         int i;
5765         struct addrconf_sysctl_table *t;
5766         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5767
5768         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5769         if (!t)
5770                 goto out;
5771
5772         for (i = 0; t->addrconf_vars[i].data; i++) {
5773                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5774                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5775                 t->addrconf_vars[i].extra2 = net;
5776         }
5777
5778         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5779
5780         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5781         if (!t->sysctl_header)
5782                 goto free;
5783
5784         p->sysctl = t;
5785         return 0;
5786
5787 free:
5788         kfree(t);
5789 out:
5790         return -ENOBUFS;
5791 }
5792
5793 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5794 {
5795         struct addrconf_sysctl_table *t;
5796
5797         if (!p->sysctl)
5798                 return;
5799
5800         t = p->sysctl;
5801         p->sysctl = NULL;
5802         unregister_net_sysctl_table(t->sysctl_header);
5803         kfree(t);
5804 }
5805
5806 static int addrconf_sysctl_register(struct inet6_dev *idev)
5807 {
5808         int err;
5809
5810         if (!sysctl_dev_name_is_allowed(idev->dev->name))
5811                 return -EINVAL;
5812
5813         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5814                                     &ndisc_ifinfo_sysctl_change);
5815         if (err)
5816                 return err;
5817         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5818                                          idev, &idev->cnf);
5819         if (err)
5820                 neigh_sysctl_unregister(idev->nd_parms);
5821
5822         return err;
5823 }
5824
5825 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5826 {
5827         __addrconf_sysctl_unregister(&idev->cnf);
5828         neigh_sysctl_unregister(idev->nd_parms);
5829 }
5830
5831
5832 #endif
5833
5834 static int __net_init addrconf_init_net(struct net *net)
5835 {
5836         int err = -ENOMEM;
5837         struct ipv6_devconf *all, *dflt;
5838
5839         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5840         if (!all)
5841                 goto err_alloc_all;
5842
5843         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5844         if (!dflt)
5845                 goto err_alloc_dflt;
5846
5847         /* these will be inherited by all namespaces */
5848         dflt->autoconf = ipv6_defaults.autoconf;
5849         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5850
5851         dflt->stable_secret.initialized = false;
5852         all->stable_secret.initialized = false;
5853
5854         net->ipv6.devconf_all = all;
5855         net->ipv6.devconf_dflt = dflt;
5856
5857 #ifdef CONFIG_SYSCTL
5858         err = __addrconf_sysctl_register(net, "all", NULL, all);
5859         if (err < 0)
5860                 goto err_reg_all;
5861
5862         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5863         if (err < 0)
5864                 goto err_reg_dflt;
5865 #endif
5866         return 0;
5867
5868 #ifdef CONFIG_SYSCTL
5869 err_reg_dflt:
5870         __addrconf_sysctl_unregister(all);
5871 err_reg_all:
5872         kfree(dflt);
5873 #endif
5874 err_alloc_dflt:
5875         kfree(all);
5876 err_alloc_all:
5877         return err;
5878 }
5879
5880 static void __net_exit addrconf_exit_net(struct net *net)
5881 {
5882 #ifdef CONFIG_SYSCTL
5883         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5884         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5885 #endif
5886         kfree(net->ipv6.devconf_dflt);
5887         kfree(net->ipv6.devconf_all);
5888 }
5889
5890 static struct pernet_operations addrconf_ops = {
5891         .init = addrconf_init_net,
5892         .exit = addrconf_exit_net,
5893 };
5894
5895 static struct rtnl_af_ops inet6_ops __read_mostly = {
5896         .family           = AF_INET6,
5897         .fill_link_af     = inet6_fill_link_af,
5898         .get_link_af_size = inet6_get_link_af_size,
5899         .validate_link_af = inet6_validate_link_af,
5900         .set_link_af      = inet6_set_link_af,
5901 };
5902
5903 /*
5904  *      Init / cleanup code
5905  */
5906
5907 int __init addrconf_init(void)
5908 {
5909         struct inet6_dev *idev;
5910         int i, err;
5911
5912         err = ipv6_addr_label_init();
5913         if (err < 0) {
5914                 pr_crit("%s: cannot initialize default policy table: %d\n",
5915                         __func__, err);
5916                 goto out;
5917         }
5918
5919         err = register_pernet_subsys(&addrconf_ops);
5920         if (err < 0)
5921                 goto out_addrlabel;
5922
5923         addrconf_wq = create_workqueue("ipv6_addrconf");
5924         if (!addrconf_wq) {
5925                 err = -ENOMEM;
5926                 goto out_nowq;
5927         }
5928
5929         /* The addrconf netdev notifier requires that loopback_dev
5930          * has it's ipv6 private information allocated and setup
5931          * before it can bring up and give link-local addresses
5932          * to other devices which are up.
5933          *
5934          * Unfortunately, loopback_dev is not necessarily the first
5935          * entry in the global dev_base list of net devices.  In fact,
5936          * it is likely to be the very last entry on that list.
5937          * So this causes the notifier registry below to try and
5938          * give link-local addresses to all devices besides loopback_dev
5939          * first, then loopback_dev, which cases all the non-loopback_dev
5940          * devices to fail to get a link-local address.
5941          *
5942          * So, as a temporary fix, allocate the ipv6 structure for
5943          * loopback_dev first by hand.
5944          * Longer term, all of the dependencies ipv6 has upon the loopback
5945          * device and it being up should be removed.
5946          */
5947         rtnl_lock();
5948         idev = ipv6_add_dev(init_net.loopback_dev);
5949         rtnl_unlock();
5950         if (IS_ERR(idev)) {
5951                 err = PTR_ERR(idev);
5952                 goto errlo;
5953         }
5954
5955         ip6_route_init_special_entries();
5956
5957         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5958                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5959
5960         register_netdevice_notifier(&ipv6_dev_notf);
5961
5962         addrconf_verify();
5963
5964         rtnl_af_register(&inet6_ops);
5965
5966         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5967                               NULL);
5968         if (err < 0)
5969                 goto errout;
5970
5971         /* Only the first call to __rtnl_register can fail */
5972         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5973         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5974         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5975                         inet6_dump_ifaddr, NULL);
5976         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5977                         inet6_dump_ifmcaddr, NULL);
5978         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5979                         inet6_dump_ifacaddr, NULL);
5980         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5981                         inet6_netconf_dump_devconf, NULL);
5982
5983         ipv6_addr_label_rtnl_register();
5984
5985         return 0;
5986 errout:
5987         rtnl_af_unregister(&inet6_ops);
5988         unregister_netdevice_notifier(&ipv6_dev_notf);
5989 errlo:
5990         destroy_workqueue(addrconf_wq);
5991 out_nowq:
5992         unregister_pernet_subsys(&addrconf_ops);
5993 out_addrlabel:
5994         ipv6_addr_label_cleanup();
5995 out:
5996         return err;
5997 }
5998
5999 void addrconf_cleanup(void)
6000 {
6001         struct net_device *dev;
6002         int i;
6003
6004         unregister_netdevice_notifier(&ipv6_dev_notf);
6005         unregister_pernet_subsys(&addrconf_ops);
6006         ipv6_addr_label_cleanup();
6007
6008         rtnl_lock();
6009
6010         __rtnl_af_unregister(&inet6_ops);
6011
6012         /* clean dev list */
6013         for_each_netdev(&init_net, dev) {
6014                 if (__in6_dev_get(dev) == NULL)
6015                         continue;
6016                 addrconf_ifdown(dev, 1);
6017         }
6018         addrconf_ifdown(init_net.loopback_dev, 2);
6019
6020         /*
6021          *      Check hash table.
6022          */
6023         spin_lock_bh(&addrconf_hash_lock);
6024         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6025                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6026         spin_unlock_bh(&addrconf_hash_lock);
6027         cancel_delayed_work(&addr_chk_work);
6028         rtnl_unlock();
6029
6030         destroy_workqueue(addrconf_wq);
6031 }