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/in6.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/if_addr.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #include <linux/slab.h>
  59 #ifdef CONFIG_SYSCTL
  60 #include <linux/sysctl.h>
  61 #endif
  62 #include <linux/capability.h>
  63 #include <linux/delay.h>
  64 #include <linux/notifier.h>
  65 #include <linux/string.h>
  66 #include <linux/hash.h>
  67
  68 #include <net/net_namespace.h>
  69 #include <net/sock.h>
  70 #include <net/snmp.h>
  71
  72 #include <net/af_ieee802154.h>
  73 #include <net/firewire.h>
  74 #include <net/ipv6.h>
  75 #include <net/protocol.h>
  76 #include <net/ndisc.h>
  77 #include <net/ip6_route.h>
  78 #include <net/addrconf.h>
  79 #include <net/tcp.h>
  80 #include <net/ip.h>
  81 #include <net/netlink.h>
  82 #include <net/pkt_sched.h>
  83 #include <linux/if_tunnel.h>
  84 #include <linux/rtnetlink.h>
  85 #include <linux/netconf.h>
  86 #include <linux/random.h>
  87 #include <linux/uaccess.h>
  88 #include <asm/unaligned.h>
  89
  90 #include <linux/proc_fs.h>
  91 #include <linux/seq_file.h>
  92 #include <linux/export.h>
  93
  94 /* Set to 3 to get tracing... */
  95 #define ACONF_DEBUG 2
  96
  97 #if ACONF_DEBUG >= 3
  98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
  99 #else
 100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 101 #endif
 102
 103 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 104
 105 static inline u32 cstamp_delta(unsigned long cstamp)
 106 {
 107         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 108 }
 109
 110 #ifdef CONFIG_SYSCTL
 111 static void addrconf_sysctl_register(struct inet6_dev *idev);
 112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 113 #else
 114 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 115 {
 116 }
 117
 118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 119 {
 120 }
 121 #endif
 122
 123 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 125 static void ipv6_regen_rndid(unsigned long data);
 126
 127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 128 static int ipv6_count_addresses(struct inet6_dev *idev);
 129
 130 /*
 131  *      Configured unicast address hash table
 132  */
 133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 134 static DEFINE_SPINLOCK(addrconf_hash_lock);
 135
 136 static void addrconf_verify(unsigned long);
 137
 138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 139 static DEFINE_SPINLOCK(addrconf_verify_lock);
 140
 141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 143
 144 static void addrconf_type_change(struct net_device *dev,
 145                                  unsigned long event);
 146 static int addrconf_ifdown(struct net_device *dev, int how);
 147
 148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 149                                                   int plen,
 150                                                   const struct net_device *dev,
 151                                                   u32 flags, u32 noflags);
 152
 153 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 154 static void addrconf_dad_timer(unsigned long data);
 155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 156 static void addrconf_dad_run(struct inet6_dev *idev);
 157 static void addrconf_rs_timer(unsigned long data);
 158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 160
 161 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 162                                 struct prefix_info *pinfo);
 163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 164                                struct net_device *dev);
 165
 166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 167         .forwarding             = 0,
 168         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 169         .mtu6                   = IPV6_MIN_MTU,
 170         .accept_ra              = 1,
 171         .accept_redirects       = 1,
 172         .autoconf               = 1,
 173         .force_mld_version      = 0,
 174         .mldv1_unsolicited_report_interval = 10 * HZ,
 175         .mldv2_unsolicited_report_interval = HZ,
 176         .dad_transmits          = 1,
 177         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 178         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 179         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 180         .use_tempaddr           = 0,
 181         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 182         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 183         .regen_max_retry        = REGEN_MAX_RETRY,
 184         .max_desync_factor      = MAX_DESYNC_FACTOR,
 185         .max_addresses          = IPV6_MAX_ADDRESSES,
 186         .accept_ra_defrtr       = 1,
 187         .accept_ra_pinfo        = 1,
 188 #ifdef CONFIG_IPV6_ROUTER_PREF
 189         .accept_ra_rtr_pref     = 1,
 190         .rtr_probe_interval     = 60 * HZ,
 191 #ifdef CONFIG_IPV6_ROUTE_INFO
 192         .accept_ra_rt_info_max_plen = 0,
 193 #endif
 194 #endif
 195         .proxy_ndp              = 0,
 196         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 197         .disable_ipv6           = 0,
 198         .accept_dad             = 1,
 199         .suppress_frag_ndisc    = 1,
 200 };
 201
 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 203         .forwarding             = 0,
 204         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 205         .mtu6                   = IPV6_MIN_MTU,
 206         .accept_ra              = 1,
 207         .accept_redirects       = 1,
 208         .autoconf               = 1,
 209         .force_mld_version      = 0,
 210         .mldv1_unsolicited_report_interval = 10 * HZ,
 211         .mldv2_unsolicited_report_interval = HZ,
 212         .dad_transmits          = 1,
 213         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 214         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 215         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 216         .use_tempaddr           = 0,
 217         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 218         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 219         .regen_max_retry        = REGEN_MAX_RETRY,
 220         .max_desync_factor      = MAX_DESYNC_FACTOR,
 221         .max_addresses          = IPV6_MAX_ADDRESSES,
 222         .accept_ra_defrtr       = 1,
 223         .accept_ra_pinfo        = 1,
 224 #ifdef CONFIG_IPV6_ROUTER_PREF
 225         .accept_ra_rtr_pref     = 1,
 226         .rtr_probe_interval     = 60 * HZ,
 227 #ifdef CONFIG_IPV6_ROUTE_INFO
 228         .accept_ra_rt_info_max_plen = 0,
 229 #endif
 230 #endif
 231         .proxy_ndp              = 0,
 232         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 233         .disable_ipv6           = 0,
 234         .accept_dad             = 1,
 235         .suppress_frag_ndisc    = 1,
 236 };
 237
 238 /* Check if a valid qdisc is available */
 239 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 240 {
 241         return !qdisc_tx_is_noop(dev);
 242 }
 243
 244 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 245 {
 246         if (del_timer(&idev->rs_timer))
 247                 __in6_dev_put(idev);
 248 }
 249
 250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
 251 {
 252         if (del_timer(&ifp->dad_timer))
 253                 __in6_ifa_put(ifp);
 254 }
 255
 256 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 257                                   unsigned long when)
 258 {
 259         if (!timer_pending(&idev->rs_timer))
 260                 in6_dev_hold(idev);
 261         mod_timer(&idev->rs_timer, jiffies + when);
 262 }
 263
 264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
 265                                    unsigned long when)
 266 {
 267         if (!timer_pending(&ifp->dad_timer))
 268                 in6_ifa_hold(ifp);
 269         mod_timer(&ifp->dad_timer, jiffies + when);
 270 }
 271
 272 static int snmp6_alloc_dev(struct inet6_dev *idev)
 273 {
 274         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 275                           sizeof(struct ipstats_mib),
 276                           __alignof__(struct ipstats_mib)) < 0)
 277                 goto err_ip;
 278         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 279                                         GFP_KERNEL);
 280         if (!idev->stats.icmpv6dev)
 281                 goto err_icmp;
 282         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 283                                            GFP_KERNEL);
 284         if (!idev->stats.icmpv6msgdev)
 285                 goto err_icmpmsg;
 286
 287         return 0;
 288
 289 err_icmpmsg:
 290         kfree(idev->stats.icmpv6dev);
 291 err_icmp:
 292         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 293 err_ip:
 294         return -ENOMEM;
 295 }
 296
 297 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 298 {
 299         struct inet6_dev *ndev;
 300
 301         ASSERT_RTNL();
 302
 303         if (dev->mtu < IPV6_MIN_MTU)
 304                 return NULL;
 305
 306         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 307
 308         if (ndev == NULL)
 309                 return NULL;
 310
 311         rwlock_init(&ndev->lock);
 312         ndev->dev = dev;
 313         INIT_LIST_HEAD(&ndev->addr_list);
 314         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 315                     (unsigned long)ndev);
 316         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 317         ndev->cnf.mtu6 = dev->mtu;
 318         ndev->cnf.sysctl = NULL;
 319         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 320         if (ndev->nd_parms == NULL) {
 321                 kfree(ndev);
 322                 return NULL;
 323         }
 324         if (ndev->cnf.forwarding)
 325                 dev_disable_lro(dev);
 326         /* We refer to the device */
 327         dev_hold(dev);
 328
 329         if (snmp6_alloc_dev(ndev) < 0) {
 330                 ADBG(KERN_WARNING
 331                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 332                         __func__, dev->name);
 333                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 334                 dev_put(dev);
 335                 kfree(ndev);
 336                 return NULL;
 337         }
 338
 339         if (snmp6_register_dev(ndev) < 0) {
 340                 ADBG(KERN_WARNING
 341                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 342                         __func__, dev->name);
 343                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 344                 ndev->dead = 1;
 345                 in6_dev_finish_destroy(ndev);
 346                 return NULL;
 347         }
 348
 349         /* One reference from device.  We must do this before
 350          * we invoke __ipv6_regen_rndid().
 351          */
 352         in6_dev_hold(ndev);
 353
 354         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 355                 ndev->cnf.accept_dad = -1;
 356
 357 #if IS_ENABLED(CONFIG_IPV6_SIT)
 358         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 359                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 360                 ndev->cnf.rtr_solicits = 0;
 361         }
 362 #endif
 363
 364         INIT_LIST_HEAD(&ndev->tempaddr_list);
 365         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 366         if ((dev->flags&IFF_LOOPBACK) ||
 367             dev->type == ARPHRD_TUNNEL ||
 368             dev->type == ARPHRD_TUNNEL6 ||
 369             dev->type == ARPHRD_SIT ||
 370             dev->type == ARPHRD_NONE) {
 371                 ndev->cnf.use_tempaddr = -1;
 372         } else {
 373                 in6_dev_hold(ndev);
 374                 ipv6_regen_rndid((unsigned long) ndev);
 375         }
 376
 377         ndev->token = in6addr_any;
 378
 379         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 380                 ndev->if_flags |= IF_READY;
 381
 382         ipv6_mc_init_dev(ndev);
 383         ndev->tstamp = jiffies;
 384         addrconf_sysctl_register(ndev);
 385         /* protected by rtnl_lock */
 386         rcu_assign_pointer(dev->ip6_ptr, ndev);
 387
 388         /* Join interface-local all-node multicast group */
 389         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 390
 391         /* Join all-node multicast group */
 392         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 393
 394         /* Join all-router multicast group if forwarding is set */
 395         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 396                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 397
 398         return ndev;
 399 }
 400
 401 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 402 {
 403         struct inet6_dev *idev;
 404
 405         ASSERT_RTNL();
 406
 407         idev = __in6_dev_get(dev);
 408         if (!idev) {
 409                 idev = ipv6_add_dev(dev);
 410                 if (!idev)
 411                         return NULL;
 412         }
 413
 414         if (dev->flags&IFF_UP)
 415                 ipv6_mc_up(idev);
 416         return idev;
 417 }
 418
 419 static int inet6_netconf_msgsize_devconf(int type)
 420 {
 421         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 422                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 423
 424         /* type -1 is used for ALL */
 425         if (type == -1 || type == NETCONFA_FORWARDING)
 426                 size += nla_total_size(4);
 427 #ifdef CONFIG_IPV6_MROUTE
 428         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 429                 size += nla_total_size(4);
 430 #endif
 431
 432         return size;
 433 }
 434
 435 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 436                                       struct ipv6_devconf *devconf, u32 portid,
 437                                       u32 seq, int event, unsigned int flags,
 438                                       int type)
 439 {
 440         struct nlmsghdr  *nlh;
 441         struct netconfmsg *ncm;
 442
 443         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 444                         flags);
 445         if (nlh == NULL)
 446                 return -EMSGSIZE;
 447
 448         ncm = nlmsg_data(nlh);
 449         ncm->ncm_family = AF_INET6;
 450
 451         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 452                 goto nla_put_failure;
 453
 454         /* type -1 is used for ALL */
 455         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 456             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 457                 goto nla_put_failure;
 458 #ifdef CONFIG_IPV6_MROUTE
 459         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 460             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 461                         devconf->mc_forwarding) < 0)
 462                 goto nla_put_failure;
 463 #endif
 464         return nlmsg_end(skb, nlh);
 465
 466 nla_put_failure:
 467         nlmsg_cancel(skb, nlh);
 468         return -EMSGSIZE;
 469 }
 470
 471 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 472                                   struct ipv6_devconf *devconf)
 473 {
 474         struct sk_buff *skb;
 475         int err = -ENOBUFS;
 476
 477         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 478         if (skb == NULL)
 479                 goto errout;
 480
 481         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 482                                          RTM_NEWNETCONF, 0, type);
 483         if (err < 0) {
 484                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 485                 WARN_ON(err == -EMSGSIZE);
 486                 kfree_skb(skb);
 487                 goto errout;
 488         }
 489         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 490         return;
 491 errout:
 492         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 493 }
 494
 495 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 496         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 497         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 498 };
 499
 500 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 501                                      struct nlmsghdr *nlh)
 502 {
 503         struct net *net = sock_net(in_skb->sk);
 504         struct nlattr *tb[NETCONFA_MAX+1];
 505         struct netconfmsg *ncm;
 506         struct sk_buff *skb;
 507         struct ipv6_devconf *devconf;
 508         struct inet6_dev *in6_dev;
 509         struct net_device *dev;
 510         int ifindex;
 511         int err;
 512
 513         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 514                           devconf_ipv6_policy);
 515         if (err < 0)
 516                 goto errout;
 517
 518         err = EINVAL;
 519         if (!tb[NETCONFA_IFINDEX])
 520                 goto errout;
 521
 522         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 523         switch (ifindex) {
 524         case NETCONFA_IFINDEX_ALL:
 525                 devconf = net->ipv6.devconf_all;
 526                 break;
 527         case NETCONFA_IFINDEX_DEFAULT:
 528                 devconf = net->ipv6.devconf_dflt;
 529                 break;
 530         default:
 531                 dev = __dev_get_by_index(net, ifindex);
 532                 if (dev == NULL)
 533                         goto errout;
 534                 in6_dev = __in6_dev_get(dev);
 535                 if (in6_dev == NULL)
 536                         goto errout;
 537                 devconf = &in6_dev->cnf;
 538                 break;
 539         }
 540
 541         err = -ENOBUFS;
 542         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 543         if (skb == NULL)
 544                 goto errout;
 545
 546         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 547                                          NETLINK_CB(in_skb).portid,
 548                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 549                                          -1);
 550         if (err < 0) {
 551                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 552                 WARN_ON(err == -EMSGSIZE);
 553                 kfree_skb(skb);
 554                 goto errout;
 555         }
 556         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 557 errout:
 558         return err;
 559 }
 560
 561 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 562                                       struct netlink_callback *cb)
 563 {
 564         struct net *net = sock_net(skb->sk);
 565         int h, s_h;
 566         int idx, s_idx;
 567         struct net_device *dev;
 568         struct inet6_dev *idev;
 569         struct hlist_head *head;
 570
 571         s_h = cb->args[0];
 572         s_idx = idx = cb->args[1];
 573
 574         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 575                 idx = 0;
 576                 head = &net->dev_index_head[h];
 577                 rcu_read_lock();
 578                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 579                           net->dev_base_seq;
 580                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 581                         if (idx < s_idx)
 582                                 goto cont;
 583                         idev = __in6_dev_get(dev);
 584                         if (!idev)
 585                                 goto cont;
 586
 587                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 588                                                        &idev->cnf,
 589                                                        NETLINK_CB(cb->skb).portid,
 590                                                        cb->nlh->nlmsg_seq,
 591                                                        RTM_NEWNETCONF,
 592                                                        NLM_F_MULTI,
 593                                                        -1) <= 0) {
 594                                 rcu_read_unlock();
 595                                 goto done;
 596                         }
 597                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 598 cont:
 599                         idx++;
 600                 }
 601                 rcu_read_unlock();
 602         }
 603         if (h == NETDEV_HASHENTRIES) {
 604                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 605                                                net->ipv6.devconf_all,
 606                                                NETLINK_CB(cb->skb).portid,
 607                                                cb->nlh->nlmsg_seq,
 608                                                RTM_NEWNETCONF, NLM_F_MULTI,
 609                                                -1) <= 0)
 610                         goto done;
 611                 else
 612                         h++;
 613         }
 614         if (h == NETDEV_HASHENTRIES + 1) {
 615                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 616                                                net->ipv6.devconf_dflt,
 617                                                NETLINK_CB(cb->skb).portid,
 618                                                cb->nlh->nlmsg_seq,
 619                                                RTM_NEWNETCONF, NLM_F_MULTI,
 620                                                -1) <= 0)
 621                         goto done;
 622                 else
 623                         h++;
 624         }
 625 done:
 626         cb->args[0] = h;
 627         cb->args[1] = idx;
 628
 629         return skb->len;
 630 }
 631
 632 #ifdef CONFIG_SYSCTL
 633 static void dev_forward_change(struct inet6_dev *idev)
 634 {
 635         struct net_device *dev;
 636         struct inet6_ifaddr *ifa;
 637
 638         if (!idev)
 639                 return;
 640         dev = idev->dev;
 641         if (idev->cnf.forwarding)
 642                 dev_disable_lro(dev);
 643         if (dev->flags & IFF_MULTICAST) {
 644                 if (idev->cnf.forwarding) {
 645                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 646                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 647                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 648                 } else {
 649                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 650                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 651                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 652                 }
 653         }
 654
 655         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 656                 if (ifa->flags&IFA_F_TENTATIVE)
 657                         continue;
 658                 if (idev->cnf.forwarding)
 659                         addrconf_join_anycast(ifa);
 660                 else
 661                         addrconf_leave_anycast(ifa);
 662         }
 663         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 664                                      dev->ifindex, &idev->cnf);
 665 }
 666
 667
 668 static void addrconf_forward_change(struct net *net, __s32 newf)
 669 {
 670         struct net_device *dev;
 671         struct inet6_dev *idev;
 672
 673         for_each_netdev(net, dev) {
 674                 idev = __in6_dev_get(dev);
 675                 if (idev) {
 676                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 677                         idev->cnf.forwarding = newf;
 678                         if (changed)
 679                                 dev_forward_change(idev);
 680                 }
 681         }
 682 }
 683
 684 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 685 {
 686         struct net *net;
 687         int old;
 688
 689         if (!rtnl_trylock())
 690                 return restart_syscall();
 691
 692         net = (struct net *)table->extra2;
 693         old = *p;
 694         *p = newf;
 695
 696         if (p == &net->ipv6.devconf_dflt->forwarding) {
 697                 if ((!newf) ^ (!old))
 698                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 699                                                      NETCONFA_IFINDEX_DEFAULT,
 700                                                      net->ipv6.devconf_dflt);
 701                 rtnl_unlock();
 702                 return 0;
 703         }
 704
 705         if (p == &net->ipv6.devconf_all->forwarding) {
 706                 net->ipv6.devconf_dflt->forwarding = newf;
 707                 addrconf_forward_change(net, newf);
 708                 if ((!newf) ^ (!old))
 709                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 710                                                      NETCONFA_IFINDEX_ALL,
 711                                                      net->ipv6.devconf_all);
 712         } else if ((!newf) ^ (!old))
 713                 dev_forward_change((struct inet6_dev *)table->extra1);
 714         rtnl_unlock();
 715
 716         if (newf)
 717                 rt6_purge_dflt_routers(net);
 718         return 1;
 719 }
 720 #endif
 721
 722 /* Nobody refers to this ifaddr, destroy it */
 723 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 724 {
 725         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 726
 727 #ifdef NET_REFCNT_DEBUG
 728         pr_debug("%s\n", __func__);
 729 #endif
 730
 731         in6_dev_put(ifp->idev);
 732
 733         if (del_timer(&ifp->dad_timer))
 734                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 735
 736         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 737                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 738                 return;
 739         }
 740         ip6_rt_put(ifp->rt);
 741
 742         kfree_rcu(ifp, rcu);
 743 }
 744
 745 static void
 746 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 747 {
 748         struct list_head *p;
 749         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 750
 751         /*
 752          * Each device address list is sorted in order of scope -
 753          * global before linklocal.
 754          */
 755         list_for_each(p, &idev->addr_list) {
 756                 struct inet6_ifaddr *ifa
 757                         = list_entry(p, struct inet6_ifaddr, if_list);
 758                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 759                         break;
 760         }
 761
 762         list_add_tail(&ifp->if_list, p);
 763 }
 764
 765 static u32 inet6_addr_hash(const struct in6_addr *addr)
 766 {
 767         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 768 }
 769
 770 /* On success it returns ifp with increased reference count */
 771
 772 static struct inet6_ifaddr *
 773 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 774               const struct in6_addr *peer_addr, int pfxlen,
 775               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 776 {
 777         struct inet6_ifaddr *ifa = NULL;
 778         struct rt6_info *rt;
 779         unsigned int hash;
 780         int err = 0;
 781         int addr_type = ipv6_addr_type(addr);
 782
 783         if (addr_type == IPV6_ADDR_ANY ||
 784             addr_type & IPV6_ADDR_MULTICAST ||
 785             (!(idev->dev->flags & IFF_LOOPBACK) &&
 786              addr_type & IPV6_ADDR_LOOPBACK))
 787                 return ERR_PTR(-EADDRNOTAVAIL);
 788
 789         rcu_read_lock_bh();
 790         if (idev->dead) {
 791                 err = -ENODEV;                  /*XXX*/
 792                 goto out2;
 793         }
 794
 795         if (idev->cnf.disable_ipv6) {
 796                 err = -EACCES;
 797                 goto out2;
 798         }
 799
 800         spin_lock(&addrconf_hash_lock);
 801
 802         /* Ignore adding duplicate addresses on an interface */
 803         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 804                 ADBG("ipv6_add_addr: already assigned\n");
 805                 err = -EEXIST;
 806                 goto out;
 807         }
 808
 809         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 810
 811         if (ifa == NULL) {
 812                 ADBG("ipv6_add_addr: malloc failed\n");
 813                 err = -ENOBUFS;
 814                 goto out;
 815         }
 816
 817         rt = addrconf_dst_alloc(idev, addr, false);
 818         if (IS_ERR(rt)) {
 819                 err = PTR_ERR(rt);
 820                 goto out;
 821         }
 822
 823         ifa->addr = *addr;
 824         if (peer_addr)
 825                 ifa->peer_addr = *peer_addr;
 826
 827         spin_lock_init(&ifa->lock);
 828         spin_lock_init(&ifa->state_lock);
 829         setup_timer(&ifa->dad_timer, addrconf_dad_timer,
 830                     (unsigned long)ifa);
 831         INIT_HLIST_NODE(&ifa->addr_lst);
 832         ifa->scope = scope;
 833         ifa->prefix_len = pfxlen;
 834         ifa->flags = flags | IFA_F_TENTATIVE;
 835         ifa->valid_lft = valid_lft;
 836         ifa->prefered_lft = prefered_lft;
 837         ifa->cstamp = ifa->tstamp = jiffies;
 838         ifa->tokenized = false;
 839
 840         ifa->rt = rt;
 841
 842         ifa->idev = idev;
 843         in6_dev_hold(idev);
 844         /* For caller */
 845         in6_ifa_hold(ifa);
 846
 847         /* Add to big hash table */
 848         hash = inet6_addr_hash(addr);
 849
 850         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 851         spin_unlock(&addrconf_hash_lock);
 852
 853         write_lock(&idev->lock);
 854         /* Add to inet6_dev unicast addr list. */
 855         ipv6_link_dev_addr(idev, ifa);
 856
 857         if (ifa->flags&IFA_F_TEMPORARY) {
 858                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 859                 in6_ifa_hold(ifa);
 860         }
 861
 862         in6_ifa_hold(ifa);
 863         write_unlock(&idev->lock);
 864 out2:
 865         rcu_read_unlock_bh();
 866
 867         if (likely(err == 0))
 868                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 869         else {
 870                 kfree(ifa);
 871                 ifa = ERR_PTR(err);
 872         }
 873
 874         return ifa;
 875 out:
 876         spin_unlock(&addrconf_hash_lock);
 877         goto out2;
 878 }
 879
 880 /* This function wants to get referenced ifp and releases it before return */
 881
 882 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 883 {
 884         struct inet6_ifaddr *ifa, *ifn;
 885         struct inet6_dev *idev = ifp->idev;
 886         int state;
 887         int deleted = 0, onlink = 0;
 888         unsigned long expires = jiffies;
 889
 890         spin_lock_bh(&ifp->state_lock);
 891         state = ifp->state;
 892         ifp->state = INET6_IFADDR_STATE_DEAD;
 893         spin_unlock_bh(&ifp->state_lock);
 894
 895         if (state == INET6_IFADDR_STATE_DEAD)
 896                 goto out;
 897
 898         spin_lock_bh(&addrconf_hash_lock);
 899         hlist_del_init_rcu(&ifp->addr_lst);
 900         spin_unlock_bh(&addrconf_hash_lock);
 901
 902         write_lock_bh(&idev->lock);
 903
 904         if (ifp->flags&IFA_F_TEMPORARY) {
 905                 list_del(&ifp->tmp_list);
 906                 if (ifp->ifpub) {
 907                         in6_ifa_put(ifp->ifpub);
 908                         ifp->ifpub = NULL;
 909                 }
 910                 __in6_ifa_put(ifp);
 911         }
 912
 913         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 914                 if (ifa == ifp) {
 915                         list_del_init(&ifp->if_list);
 916                         __in6_ifa_put(ifp);
 917
 918                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 919                                 break;
 920                         deleted = 1;
 921                         continue;
 922                 } else if (ifp->flags & IFA_F_PERMANENT) {
 923                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 924                                               ifp->prefix_len)) {
 925                                 if (ifa->flags & IFA_F_PERMANENT) {
 926                                         onlink = 1;
 927                                         if (deleted)
 928                                                 break;
 929                                 } else {
 930                                         unsigned long lifetime;
 931
 932                                         if (!onlink)
 933                                                 onlink = -1;
 934
 935                                         spin_lock(&ifa->lock);
 936
 937                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 938                                         /*
 939                                          * Note: Because this address is
 940                                          * not permanent, lifetime <
 941                                          * LONG_MAX / HZ here.
 942                                          */
 943                                         if (time_before(expires,
 944                                                         ifa->tstamp + lifetime * HZ))
 945                                                 expires = ifa->tstamp + lifetime * HZ;
 946                                         spin_unlock(&ifa->lock);
 947                                 }
 948                         }
 949                 }
 950         }
 951         write_unlock_bh(&idev->lock);
 952
 953         addrconf_del_dad_timer(ifp);
 954
 955         ipv6_ifa_notify(RTM_DELADDR, ifp);
 956
 957         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
 958
 959         /*
 960          * Purge or update corresponding prefix
 961          *
 962          * 1) we don't purge prefix here if address was not permanent.
 963          *    prefix is managed by its own lifetime.
 964          * 2) if there're no addresses, delete prefix.
 965          * 3) if there're still other permanent address(es),
 966          *    corresponding prefix is still permanent.
 967          * 4) otherwise, update prefix lifetime to the
 968          *    longest valid lifetime among the corresponding
 969          *    addresses on the device.
 970          *    Note: subsequent RA will update lifetime.
 971          *
 972          * --yoshfuji
 973          */
 974         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 975                 struct in6_addr prefix;
 976                 struct rt6_info *rt;
 977
 978                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 979
 980                 rt = addrconf_get_prefix_route(&prefix,
 981                                                ifp->prefix_len,
 982                                                ifp->idev->dev,
 983                                                0, RTF_GATEWAY | RTF_DEFAULT);
 984
 985                 if (rt) {
 986                         if (onlink == 0) {
 987                                 ip6_del_rt(rt);
 988                                 rt = NULL;
 989                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
 990                                 rt6_set_expires(rt, expires);
 991                         }
 992                 }
 993                 ip6_rt_put(rt);
 994         }
 995
 996         /* clean up prefsrc entries */
 997         rt6_remove_prefsrc(ifp);
 998 out:
 999         in6_ifa_put(ifp);
1000 }
1001
1002 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1003 {
1004         struct inet6_dev *idev = ifp->idev;
1005         struct in6_addr addr, *tmpaddr;
1006         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1007         unsigned long regen_advance;
1008         int tmp_plen;
1009         int ret = 0;
1010         u32 addr_flags;
1011         unsigned long now = jiffies;
1012
1013         write_lock(&idev->lock);
1014         if (ift) {
1015                 spin_lock_bh(&ift->lock);
1016                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1017                 spin_unlock_bh(&ift->lock);
1018                 tmpaddr = &addr;
1019         } else {
1020                 tmpaddr = NULL;
1021         }
1022 retry:
1023         in6_dev_hold(idev);
1024         if (idev->cnf.use_tempaddr <= 0) {
1025                 write_unlock(&idev->lock);
1026                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1027                 in6_dev_put(idev);
1028                 ret = -1;
1029                 goto out;
1030         }
1031         spin_lock_bh(&ifp->lock);
1032         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1033                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1034                 spin_unlock_bh(&ifp->lock);
1035                 write_unlock(&idev->lock);
1036                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1037                         __func__);
1038                 in6_dev_put(idev);
1039                 ret = -1;
1040                 goto out;
1041         }
1042         in6_ifa_hold(ifp);
1043         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1044         __ipv6_try_regen_rndid(idev, tmpaddr);
1045         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1046         age = (now - ifp->tstamp) / HZ;
1047         tmp_valid_lft = min_t(__u32,
1048                               ifp->valid_lft,
1049                               idev->cnf.temp_valid_lft + age);
1050         tmp_prefered_lft = min_t(__u32,
1051                                  ifp->prefered_lft,
1052                                  idev->cnf.temp_prefered_lft + age -
1053                                  idev->cnf.max_desync_factor);
1054         tmp_plen = ifp->prefix_len;
1055         tmp_tstamp = ifp->tstamp;
1056         spin_unlock_bh(&ifp->lock);
1057
1058         regen_advance = idev->cnf.regen_max_retry *
1059                         idev->cnf.dad_transmits *
1060                         idev->nd_parms->retrans_time / HZ;
1061         write_unlock(&idev->lock);
1062
1063         /* A temporary address is created only if this calculated Preferred
1064          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1065          * an implementation must not create a temporary address with a zero
1066          * Preferred Lifetime.
1067          */
1068         if (tmp_prefered_lft <= regen_advance) {
1069                 in6_ifa_put(ifp);
1070                 in6_dev_put(idev);
1071                 ret = -1;
1072                 goto out;
1073         }
1074
1075         addr_flags = IFA_F_TEMPORARY;
1076         /* set in addrconf_prefix_rcv() */
1077         if (ifp->flags & IFA_F_OPTIMISTIC)
1078                 addr_flags |= IFA_F_OPTIMISTIC;
1079
1080         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1081                             ipv6_addr_scope(&addr), addr_flags,
1082                             tmp_valid_lft, tmp_prefered_lft);
1083         if (IS_ERR(ift)) {
1084                 in6_ifa_put(ifp);
1085                 in6_dev_put(idev);
1086                 pr_info("%s: retry temporary address regeneration\n", __func__);
1087                 tmpaddr = &addr;
1088                 write_lock(&idev->lock);
1089                 goto retry;
1090         }
1091
1092         spin_lock_bh(&ift->lock);
1093         ift->ifpub = ifp;
1094         ift->cstamp = now;
1095         ift->tstamp = tmp_tstamp;
1096         spin_unlock_bh(&ift->lock);
1097
1098         addrconf_dad_start(ift);
1099         in6_ifa_put(ift);
1100         in6_dev_put(idev);
1101 out:
1102         return ret;
1103 }
1104
1105 /*
1106  *      Choose an appropriate source address (RFC3484)
1107  */
1108 enum {
1109         IPV6_SADDR_RULE_INIT = 0,
1110         IPV6_SADDR_RULE_LOCAL,
1111         IPV6_SADDR_RULE_SCOPE,
1112         IPV6_SADDR_RULE_PREFERRED,
1113 #ifdef CONFIG_IPV6_MIP6
1114         IPV6_SADDR_RULE_HOA,
1115 #endif
1116         IPV6_SADDR_RULE_OIF,
1117         IPV6_SADDR_RULE_LABEL,
1118         IPV6_SADDR_RULE_PRIVACY,
1119         IPV6_SADDR_RULE_ORCHID,
1120         IPV6_SADDR_RULE_PREFIX,
1121         IPV6_SADDR_RULE_MAX
1122 };
1123
1124 struct ipv6_saddr_score {
1125         int                     rule;
1126         int                     addr_type;
1127         struct inet6_ifaddr     *ifa;
1128         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1129         int                     scopedist;
1130         int                     matchlen;
1131 };
1132
1133 struct ipv6_saddr_dst {
1134         const struct in6_addr *addr;
1135         int ifindex;
1136         int scope;
1137         int label;
1138         unsigned int prefs;
1139 };
1140
1141 static inline int ipv6_saddr_preferred(int type)
1142 {
1143         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1144                 return 1;
1145         return 0;
1146 }
1147
1148 static int ipv6_get_saddr_eval(struct net *net,
1149                                struct ipv6_saddr_score *score,
1150                                struct ipv6_saddr_dst *dst,
1151                                int i)
1152 {
1153         int ret;
1154
1155         if (i <= score->rule) {
1156                 switch (i) {
1157                 case IPV6_SADDR_RULE_SCOPE:
1158                         ret = score->scopedist;
1159                         break;
1160                 case IPV6_SADDR_RULE_PREFIX:
1161                         ret = score->matchlen;
1162                         break;
1163                 default:
1164                         ret = !!test_bit(i, score->scorebits);
1165                 }
1166                 goto out;
1167         }
1168
1169         switch (i) {
1170         case IPV6_SADDR_RULE_INIT:
1171                 /* Rule 0: remember if hiscore is not ready yet */
1172                 ret = !!score->ifa;
1173                 break;
1174         case IPV6_SADDR_RULE_LOCAL:
1175                 /* Rule 1: Prefer same address */
1176                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1177                 break;
1178         case IPV6_SADDR_RULE_SCOPE:
1179                 /* Rule 2: Prefer appropriate scope
1180                  *
1181                  *      ret
1182                  *       ^
1183                  *    -1 |  d 15
1184                  *    ---+--+-+---> scope
1185                  *       |
1186                  *       |             d is scope of the destination.
1187                  *  B-d  |  \
1188                  *       |   \      <- smaller scope is better if
1189                  *  B-15 |    \        if scope is enough for destinaion.
1190                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1191                  * d-C-1 | /
1192                  *       |/         <- greater is better
1193                  *   -C  /             if scope is not enough for destination.
1194                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1195                  *
1196                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1197                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1198                  * Assume B = 0 and we get C > 29.
1199                  */
1200                 ret = __ipv6_addr_src_scope(score->addr_type);
1201                 if (ret >= dst->scope)
1202                         ret = -ret;
1203                 else
1204                         ret -= 128;     /* 30 is enough */
1205                 score->scopedist = ret;
1206                 break;
1207         case IPV6_SADDR_RULE_PREFERRED:
1208                 /* Rule 3: Avoid deprecated and optimistic addresses */
1209                 ret = ipv6_saddr_preferred(score->addr_type) ||
1210                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1211                 break;
1212 #ifdef CONFIG_IPV6_MIP6
1213         case IPV6_SADDR_RULE_HOA:
1214             {
1215                 /* Rule 4: Prefer home address */
1216                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1217                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1218                 break;
1219             }
1220 #endif
1221         case IPV6_SADDR_RULE_OIF:
1222                 /* Rule 5: Prefer outgoing interface */
1223                 ret = (!dst->ifindex ||
1224                        dst->ifindex == score->ifa->idev->dev->ifindex);
1225                 break;
1226         case IPV6_SADDR_RULE_LABEL:
1227                 /* Rule 6: Prefer matching label */
1228                 ret = ipv6_addr_label(net,
1229                                       &score->ifa->addr, score->addr_type,
1230                                       score->ifa->idev->dev->ifindex) == dst->label;
1231                 break;
1232         case IPV6_SADDR_RULE_PRIVACY:
1233             {
1234                 /* Rule 7: Prefer public address
1235                  * Note: prefer temporary address if use_tempaddr >= 2
1236                  */
1237                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1238                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1239                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1240                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1241                 break;
1242             }
1243         case IPV6_SADDR_RULE_ORCHID:
1244                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1245                  *          non-ORCHID vs non-ORCHID
1246                  */
1247                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1248                         ipv6_addr_orchid(dst->addr));
1249                 break;
1250         case IPV6_SADDR_RULE_PREFIX:
1251                 /* Rule 8: Use longest matching prefix */
1252                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1253                 if (ret > score->ifa->prefix_len)
1254                         ret = score->ifa->prefix_len;
1255                 score->matchlen = ret;
1256                 break;
1257         default:
1258                 ret = 0;
1259         }
1260
1261         if (ret)
1262                 __set_bit(i, score->scorebits);
1263         score->rule = i;
1264 out:
1265         return ret;
1266 }
1267
1268 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1269                        const struct in6_addr *daddr, unsigned int prefs,
1270                        struct in6_addr *saddr)
1271 {
1272         struct ipv6_saddr_score scores[2],
1273                                 *score = &scores[0], *hiscore = &scores[1];
1274         struct ipv6_saddr_dst dst;
1275         struct net_device *dev;
1276         int dst_type;
1277
1278         dst_type = __ipv6_addr_type(daddr);
1279         dst.addr = daddr;
1280         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1281         dst.scope = __ipv6_addr_src_scope(dst_type);
1282         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1283         dst.prefs = prefs;
1284
1285         hiscore->rule = -1;
1286         hiscore->ifa = NULL;
1287
1288         rcu_read_lock();
1289
1290         for_each_netdev_rcu(net, dev) {
1291                 struct inet6_dev *idev;
1292
1293                 /* Candidate Source Address (section 4)
1294                  *  - multicast and link-local destination address,
1295                  *    the set of candidate source address MUST only
1296                  *    include addresses assigned to interfaces
1297                  *    belonging to the same link as the outgoing
1298                  *    interface.
1299                  * (- For site-local destination addresses, the
1300                  *    set of candidate source addresses MUST only
1301                  *    include addresses assigned to interfaces
1302                  *    belonging to the same site as the outgoing
1303                  *    interface.)
1304                  */
1305                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1306                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1307                     dst.ifindex && dev->ifindex != dst.ifindex)
1308                         continue;
1309
1310                 idev = __in6_dev_get(dev);
1311                 if (!idev)
1312                         continue;
1313
1314                 read_lock_bh(&idev->lock);
1315                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1316                         int i;
1317
1318                         /*
1319                          * - Tentative Address (RFC2462 section 5.4)
1320                          *  - A tentative address is not considered
1321                          *    "assigned to an interface" in the traditional
1322                          *    sense, unless it is also flagged as optimistic.
1323                          * - Candidate Source Address (section 4)
1324                          *  - In any case, anycast addresses, multicast
1325                          *    addresses, and the unspecified address MUST
1326                          *    NOT be included in a candidate set.
1327                          */
1328                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1329                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1330                                 continue;
1331
1332                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1333
1334                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1335                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1336                                 LIMIT_NETDEBUG(KERN_DEBUG
1337                                                "ADDRCONF: unspecified / multicast address "
1338                                                "assigned as unicast address on %s",
1339                                                dev->name);
1340                                 continue;
1341                         }
1342
1343                         score->rule = -1;
1344                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1345
1346                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1347                                 int minihiscore, miniscore;
1348
1349                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1350                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1351
1352                                 if (minihiscore > miniscore) {
1353                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1354                                             score->scopedist > 0) {
1355                                                 /*
1356                                                  * special case:
1357                                                  * each remaining entry
1358                                                  * has too small (not enough)
1359                                                  * scope, because ifa entries
1360                                                  * are sorted by their scope
1361                                                  * values.
1362                                                  */
1363                                                 goto try_nextdev;
1364                                         }
1365                                         break;
1366                                 } else if (minihiscore < miniscore) {
1367                                         if (hiscore->ifa)
1368                                                 in6_ifa_put(hiscore->ifa);
1369
1370                                         in6_ifa_hold(score->ifa);
1371
1372                                         swap(hiscore, score);
1373
1374                                         /* restore our iterator */
1375                                         score->ifa = hiscore->ifa;
1376
1377                                         break;
1378                                 }
1379                         }
1380                 }
1381 try_nextdev:
1382                 read_unlock_bh(&idev->lock);
1383         }
1384         rcu_read_unlock();
1385
1386         if (!hiscore->ifa)
1387                 return -EADDRNOTAVAIL;
1388
1389         *saddr = hiscore->ifa->addr;
1390         in6_ifa_put(hiscore->ifa);
1391         return 0;
1392 }
1393 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1394
1395 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1396                       unsigned char banned_flags)
1397 {
1398         struct inet6_ifaddr *ifp;
1399         int err = -EADDRNOTAVAIL;
1400
1401         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1402                 if (ifp->scope == IFA_LINK &&
1403                     !(ifp->flags & banned_flags)) {
1404                         *addr = ifp->addr;
1405                         err = 0;
1406                         break;
1407                 }
1408         }
1409         return err;
1410 }
1411
1412 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1413                     unsigned char banned_flags)
1414 {
1415         struct inet6_dev *idev;
1416         int err = -EADDRNOTAVAIL;
1417
1418         rcu_read_lock();
1419         idev = __in6_dev_get(dev);
1420         if (idev) {
1421                 read_lock_bh(&idev->lock);
1422                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1423                 read_unlock_bh(&idev->lock);
1424         }
1425         rcu_read_unlock();
1426         return err;
1427 }
1428
1429 static int ipv6_count_addresses(struct inet6_dev *idev)
1430 {
1431         int cnt = 0;
1432         struct inet6_ifaddr *ifp;
1433
1434         read_lock_bh(&idev->lock);
1435         list_for_each_entry(ifp, &idev->addr_list, if_list)
1436                 cnt++;
1437         read_unlock_bh(&idev->lock);
1438         return cnt;
1439 }
1440
1441 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1442                   const struct net_device *dev, int strict)
1443 {
1444         struct inet6_ifaddr *ifp;
1445         unsigned int hash = inet6_addr_hash(addr);
1446
1447         rcu_read_lock_bh();
1448         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1449                 if (!net_eq(dev_net(ifp->idev->dev), net))
1450                         continue;
1451                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1452                     !(ifp->flags&IFA_F_TENTATIVE) &&
1453                     (dev == NULL || ifp->idev->dev == dev ||
1454                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1455                         rcu_read_unlock_bh();
1456                         return 1;
1457                 }
1458         }
1459
1460         rcu_read_unlock_bh();
1461         return 0;
1462 }
1463 EXPORT_SYMBOL(ipv6_chk_addr);
1464
1465 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1466                                struct net_device *dev)
1467 {
1468         unsigned int hash = inet6_addr_hash(addr);
1469         struct inet6_ifaddr *ifp;
1470
1471         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1472                 if (!net_eq(dev_net(ifp->idev->dev), net))
1473                         continue;
1474                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1475                         if (dev == NULL || ifp->idev->dev == dev)
1476                                 return true;
1477                 }
1478         }
1479         return false;
1480 }
1481
1482 /* Compares an address/prefix_len with addresses on device @dev.
1483  * If one is found it returns true.
1484  */
1485 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1486         const unsigned int prefix_len, struct net_device *dev)
1487 {
1488         struct inet6_dev *idev;
1489         struct inet6_ifaddr *ifa;
1490         bool ret = false;
1491
1492         rcu_read_lock();
1493         idev = __in6_dev_get(dev);
1494         if (idev) {
1495                 read_lock_bh(&idev->lock);
1496                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1497                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1498                         if (ret)
1499                                 break;
1500                 }
1501                 read_unlock_bh(&idev->lock);
1502         }
1503         rcu_read_unlock();
1504
1505         return ret;
1506 }
1507 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1508
1509 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1510 {
1511         struct inet6_dev *idev;
1512         struct inet6_ifaddr *ifa;
1513         int     onlink;
1514
1515         onlink = 0;
1516         rcu_read_lock();
1517         idev = __in6_dev_get(dev);
1518         if (idev) {
1519                 read_lock_bh(&idev->lock);
1520                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1521                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1522                                                    ifa->prefix_len);
1523                         if (onlink)
1524                                 break;
1525                 }
1526                 read_unlock_bh(&idev->lock);
1527         }
1528         rcu_read_unlock();
1529         return onlink;
1530 }
1531 EXPORT_SYMBOL(ipv6_chk_prefix);
1532
1533 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1534                                      struct net_device *dev, int strict)
1535 {
1536         struct inet6_ifaddr *ifp, *result = NULL;
1537         unsigned int hash = inet6_addr_hash(addr);
1538
1539         rcu_read_lock_bh();
1540         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1541                 if (!net_eq(dev_net(ifp->idev->dev), net))
1542                         continue;
1543                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1544                         if (dev == NULL || ifp->idev->dev == dev ||
1545                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1546                                 result = ifp;
1547                                 in6_ifa_hold(ifp);
1548                                 break;
1549                         }
1550                 }
1551         }
1552         rcu_read_unlock_bh();
1553
1554         return result;
1555 }
1556
1557 /* Gets referenced address, destroys ifaddr */
1558
1559 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1560 {
1561         if (ifp->flags&IFA_F_PERMANENT) {
1562                 spin_lock_bh(&ifp->lock);
1563                 addrconf_del_dad_timer(ifp);
1564                 ifp->flags |= IFA_F_TENTATIVE;
1565                 if (dad_failed)
1566                         ifp->flags |= IFA_F_DADFAILED;
1567                 spin_unlock_bh(&ifp->lock);
1568                 if (dad_failed)
1569                         ipv6_ifa_notify(0, ifp);
1570                 in6_ifa_put(ifp);
1571         } else if (ifp->flags&IFA_F_TEMPORARY) {
1572                 struct inet6_ifaddr *ifpub;
1573                 spin_lock_bh(&ifp->lock);
1574                 ifpub = ifp->ifpub;
1575                 if (ifpub) {
1576                         in6_ifa_hold(ifpub);
1577                         spin_unlock_bh(&ifp->lock);
1578                         ipv6_create_tempaddr(ifpub, ifp);
1579                         in6_ifa_put(ifpub);
1580                 } else {
1581                         spin_unlock_bh(&ifp->lock);
1582                 }
1583                 ipv6_del_addr(ifp);
1584         } else
1585                 ipv6_del_addr(ifp);
1586 }
1587
1588 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1589 {
1590         int err = -ENOENT;
1591
1592         spin_lock(&ifp->state_lock);
1593         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1594                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1595                 err = 0;
1596         }
1597         spin_unlock(&ifp->state_lock);
1598
1599         return err;
1600 }
1601
1602 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1603 {
1604         struct inet6_dev *idev = ifp->idev;
1605
1606         if (addrconf_dad_end(ifp)) {
1607                 in6_ifa_put(ifp);
1608                 return;
1609         }
1610
1611         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1612                              ifp->idev->dev->name, &ifp->addr);
1613
1614         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1615                 struct in6_addr addr;
1616
1617                 addr.s6_addr32[0] = htonl(0xfe800000);
1618                 addr.s6_addr32[1] = 0;
1619
1620                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1621                     ipv6_addr_equal(&ifp->addr, &addr)) {
1622                         /* DAD failed for link-local based on MAC address */
1623                         idev->cnf.disable_ipv6 = 1;
1624
1625                         pr_info("%s: IPv6 being disabled!\n",
1626                                 ifp->idev->dev->name);
1627                 }
1628         }
1629
1630         addrconf_dad_stop(ifp, 1);
1631 }
1632
1633 /* Join to solicited addr multicast group. */
1634
1635 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1636 {
1637         struct in6_addr maddr;
1638
1639         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1640                 return;
1641
1642         addrconf_addr_solict_mult(addr, &maddr);
1643         ipv6_dev_mc_inc(dev, &maddr);
1644 }
1645
1646 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1647 {
1648         struct in6_addr maddr;
1649
1650         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1651                 return;
1652
1653         addrconf_addr_solict_mult(addr, &maddr);
1654         __ipv6_dev_mc_dec(idev, &maddr);
1655 }
1656
1657 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1658 {
1659         struct in6_addr addr;
1660         if (ifp->prefix_len == 127) /* RFC 6164 */
1661                 return;
1662         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1663         if (ipv6_addr_any(&addr))
1664                 return;
1665         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1666 }
1667
1668 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1669 {
1670         struct in6_addr addr;
1671         if (ifp->prefix_len == 127) /* RFC 6164 */
1672                 return;
1673         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1674         if (ipv6_addr_any(&addr))
1675                 return;
1676         __ipv6_dev_ac_dec(ifp->idev, &addr);
1677 }
1678
1679 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1680 {
1681         if (dev->addr_len != ETH_ALEN)
1682                 return -1;
1683         memcpy(eui, dev->dev_addr, 3);
1684         memcpy(eui + 5, dev->dev_addr + 3, 3);
1685
1686         /*
1687          * The zSeries OSA network cards can be shared among various
1688          * OS instances, but the OSA cards have only one MAC address.
1689          * This leads to duplicate address conflicts in conjunction
1690          * with IPv6 if more than one instance uses the same card.
1691          *
1692          * The driver for these cards can deliver a unique 16-bit
1693          * identifier for each instance sharing the same card.  It is
1694          * placed instead of 0xFFFE in the interface identifier.  The
1695          * "u" bit of the interface identifier is not inverted in this
1696          * case.  Hence the resulting interface identifier has local
1697          * scope according to RFC2373.
1698          */
1699         if (dev->dev_id) {
1700                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1701                 eui[4] = dev->dev_id & 0xFF;
1702         } else {
1703                 eui[3] = 0xFF;
1704                 eui[4] = 0xFE;
1705                 eui[0] ^= 2;
1706         }
1707         return 0;
1708 }
1709
1710 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1711 {
1712         if (dev->addr_len != IEEE802154_ADDR_LEN)
1713                 return -1;
1714         memcpy(eui, dev->dev_addr, 8);
1715         eui[0] ^= 2;
1716         return 0;
1717 }
1718
1719 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1720 {
1721         union fwnet_hwaddr *ha;
1722
1723         if (dev->addr_len != FWNET_ALEN)
1724                 return -1;
1725
1726         ha = (union fwnet_hwaddr *)dev->dev_addr;
1727
1728         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1729         eui[0] ^= 2;
1730         return 0;
1731 }
1732
1733 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1734 {
1735         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1736         if (dev->addr_len != ARCNET_ALEN)
1737                 return -1;
1738         memset(eui, 0, 7);
1739         eui[7] = *(u8 *)dev->dev_addr;
1740         return 0;
1741 }
1742
1743 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1744 {
1745         if (dev->addr_len != INFINIBAND_ALEN)
1746                 return -1;
1747         memcpy(eui, dev->dev_addr + 12, 8);
1748         eui[0] |= 2;
1749         return 0;
1750 }
1751
1752 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1753 {
1754         if (addr == 0)
1755                 return -1;
1756         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1757                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1758                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1759                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1760                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1761                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1762         eui[1] = 0;
1763         eui[2] = 0x5E;
1764         eui[3] = 0xFE;
1765         memcpy(eui + 4, &addr, 4);
1766         return 0;
1767 }
1768
1769 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1770 {
1771         if (dev->priv_flags & IFF_ISATAP)
1772                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1773         return -1;
1774 }
1775
1776 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1777 {
1778         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1779 }
1780
1781 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1782 {
1783         memcpy(eui, dev->perm_addr, 3);
1784         memcpy(eui + 5, dev->perm_addr + 3, 3);
1785         eui[3] = 0xFF;
1786         eui[4] = 0xFE;
1787         eui[0] ^= 2;
1788         return 0;
1789 }
1790
1791 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1792 {
1793         switch (dev->type) {
1794         case ARPHRD_ETHER:
1795         case ARPHRD_FDDI:
1796                 return addrconf_ifid_eui48(eui, dev);
1797         case ARPHRD_ARCNET:
1798                 return addrconf_ifid_arcnet(eui, dev);
1799         case ARPHRD_INFINIBAND:
1800                 return addrconf_ifid_infiniband(eui, dev);
1801         case ARPHRD_SIT:
1802                 return addrconf_ifid_sit(eui, dev);
1803         case ARPHRD_IPGRE:
1804                 return addrconf_ifid_gre(eui, dev);
1805         case ARPHRD_IEEE802154:
1806                 return addrconf_ifid_eui64(eui, dev);
1807         case ARPHRD_IEEE1394:
1808                 return addrconf_ifid_ieee1394(eui, dev);
1809         case ARPHRD_TUNNEL6:
1810                 return addrconf_ifid_ip6tnl(eui, dev);
1811         }
1812         return -1;
1813 }
1814
1815 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1816 {
1817         int err = -1;
1818         struct inet6_ifaddr *ifp;
1819
1820         read_lock_bh(&idev->lock);
1821         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1822                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1823                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1824                         err = 0;
1825                         break;
1826                 }
1827         }
1828         read_unlock_bh(&idev->lock);
1829         return err;
1830 }
1831
1832 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1833 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1834 {
1835 regen:
1836         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1837         idev->rndid[0] &= ~0x02;
1838
1839         /*
1840          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1841          * check if generated address is not inappropriate
1842          *
1843          *  - Reserved subnet anycast (RFC 2526)
1844          *      11111101 11....11 1xxxxxxx
1845          *  - ISATAP (RFC4214) 6.1
1846          *      00-00-5E-FE-xx-xx-xx-xx
1847          *  - value 0
1848          *  - XXX: already assigned to an address on the device
1849          */
1850         if (idev->rndid[0] == 0xfd &&
1851             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1852             (idev->rndid[7]&0x80))
1853                 goto regen;
1854         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1855                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1856                         goto regen;
1857                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1858                         goto regen;
1859         }
1860 }
1861
1862 static void ipv6_regen_rndid(unsigned long data)
1863 {
1864         struct inet6_dev *idev = (struct inet6_dev *) data;
1865         unsigned long expires;
1866
1867         rcu_read_lock_bh();
1868         write_lock_bh(&idev->lock);
1869
1870         if (idev->dead)
1871                 goto out;
1872
1873         __ipv6_regen_rndid(idev);
1874
1875         expires = jiffies +
1876                 idev->cnf.temp_prefered_lft * HZ -
1877                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1878                 idev->cnf.max_desync_factor * HZ;
1879         if (time_before(expires, jiffies)) {
1880                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1881                         __func__, idev->dev->name);
1882                 goto out;
1883         }
1884
1885         if (!mod_timer(&idev->regen_timer, expires))
1886                 in6_dev_hold(idev);
1887
1888 out:
1889         write_unlock_bh(&idev->lock);
1890         rcu_read_unlock_bh();
1891         in6_dev_put(idev);
1892 }
1893
1894 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1895 {
1896         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1897                 __ipv6_regen_rndid(idev);
1898 }
1899
1900 /*
1901  *      Add prefix route.
1902  */
1903
1904 static void
1905 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1906                       unsigned long expires, u32 flags)
1907 {
1908         struct fib6_config cfg = {
1909                 .fc_table = RT6_TABLE_PREFIX,
1910                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1911                 .fc_ifindex = dev->ifindex,
1912                 .fc_expires = expires,
1913                 .fc_dst_len = plen,
1914                 .fc_flags = RTF_UP | flags,
1915                 .fc_nlinfo.nl_net = dev_net(dev),
1916                 .fc_protocol = RTPROT_KERNEL,
1917         };
1918
1919         cfg.fc_dst = *pfx;
1920
1921         /* Prevent useless cloning on PtP SIT.
1922            This thing is done here expecting that the whole
1923            class of non-broadcast devices need not cloning.
1924          */
1925 #if IS_ENABLED(CONFIG_IPV6_SIT)
1926         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1927                 cfg.fc_flags |= RTF_NONEXTHOP;
1928 #endif
1929
1930         ip6_route_add(&cfg);
1931 }
1932
1933
1934 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1935                                                   int plen,
1936                                                   const struct net_device *dev,
1937                                                   u32 flags, u32 noflags)
1938 {
1939         struct fib6_node *fn;
1940         struct rt6_info *rt = NULL;
1941         struct fib6_table *table;
1942
1943         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1944         if (table == NULL)
1945                 return NULL;
1946
1947         read_lock_bh(&table->tb6_lock);
1948         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1949         if (!fn)
1950                 goto out;
1951         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1952                 if (rt->dst.dev->ifindex != dev->ifindex)
1953                         continue;
1954                 if ((rt->rt6i_flags & flags) != flags)
1955                         continue;
1956                 if ((rt->rt6i_flags & noflags) != 0)
1957                         continue;
1958                 dst_hold(&rt->dst);
1959                 break;
1960         }
1961 out:
1962         read_unlock_bh(&table->tb6_lock);
1963         return rt;
1964 }
1965
1966
1967 /* Create "default" multicast route to the interface */
1968
1969 static void addrconf_add_mroute(struct net_device *dev)
1970 {
1971         struct fib6_config cfg = {
1972                 .fc_table = RT6_TABLE_LOCAL,
1973                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1974                 .fc_ifindex = dev->ifindex,
1975                 .fc_dst_len = 8,
1976                 .fc_flags = RTF_UP,
1977                 .fc_nlinfo.nl_net = dev_net(dev),
1978         };
1979
1980         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1981
1982         ip6_route_add(&cfg);
1983 }
1984
1985 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1986 {
1987         struct inet6_dev *idev;
1988
1989         ASSERT_RTNL();
1990
1991         idev = ipv6_find_idev(dev);
1992         if (!idev)
1993                 return ERR_PTR(-ENOBUFS);
1994
1995         if (idev->cnf.disable_ipv6)
1996                 return ERR_PTR(-EACCES);
1997
1998         /* Add default multicast route */
1999         if (!(dev->flags & IFF_LOOPBACK))
2000                 addrconf_add_mroute(dev);
2001
2002         return idev;
2003 }
2004
2005 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2006 {
2007         struct prefix_info *pinfo;
2008         __u32 valid_lft;
2009         __u32 prefered_lft;
2010         int addr_type;
2011         struct inet6_dev *in6_dev;
2012         struct net *net = dev_net(dev);
2013
2014         pinfo = (struct prefix_info *) opt;
2015
2016         if (len < sizeof(struct prefix_info)) {
2017                 ADBG("addrconf: prefix option too short\n");
2018                 return;
2019         }
2020
2021         /*
2022          *      Validation checks ([ADDRCONF], page 19)
2023          */
2024
2025         addr_type = ipv6_addr_type(&pinfo->prefix);
2026
2027         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2028                 return;
2029
2030         valid_lft = ntohl(pinfo->valid);
2031         prefered_lft = ntohl(pinfo->prefered);
2032
2033         if (prefered_lft > valid_lft) {
2034                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2035                 return;
2036         }
2037
2038         in6_dev = in6_dev_get(dev);
2039
2040         if (in6_dev == NULL) {
2041                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2042                                     dev->name);
2043                 return;
2044         }
2045
2046         /*
2047          *      Two things going on here:
2048          *      1) Add routes for on-link prefixes
2049          *      2) Configure prefixes with the auto flag set
2050          */
2051
2052         if (pinfo->onlink) {
2053                 struct rt6_info *rt;
2054                 unsigned long rt_expires;
2055
2056                 /* Avoid arithmetic overflow. Really, we could
2057                  * save rt_expires in seconds, likely valid_lft,
2058                  * but it would require division in fib gc, that it
2059                  * not good.
2060                  */
2061                 if (HZ > USER_HZ)
2062                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2063                 else
2064                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2065
2066                 if (addrconf_finite_timeout(rt_expires))
2067                         rt_expires *= HZ;
2068
2069                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2070                                                pinfo->prefix_len,
2071                                                dev,
2072                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2073                                                RTF_GATEWAY | RTF_DEFAULT);
2074
2075                 if (rt) {
2076                         /* Autoconf prefix route */
2077                         if (valid_lft == 0) {
2078                                 ip6_del_rt(rt);
2079                                 rt = NULL;
2080                         } else if (addrconf_finite_timeout(rt_expires)) {
2081                                 /* not infinity */
2082                                 rt6_set_expires(rt, jiffies + rt_expires);
2083                         } else {
2084                                 rt6_clean_expires(rt);
2085                         }
2086                 } else if (valid_lft) {
2087                         clock_t expires = 0;
2088                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2089                         if (addrconf_finite_timeout(rt_expires)) {
2090                                 /* not infinity */
2091                                 flags |= RTF_EXPIRES;
2092                                 expires = jiffies_to_clock_t(rt_expires);
2093                         }
2094                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2095                                               dev, expires, flags);
2096                 }
2097                 ip6_rt_put(rt);
2098         }
2099
2100         /* Try to figure out our local address for this prefix */
2101
2102         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2103                 struct inet6_ifaddr *ifp;
2104                 struct in6_addr addr;
2105                 int create = 0, update_lft = 0;
2106                 bool tokenized = false;
2107
2108                 if (pinfo->prefix_len == 64) {
2109                         memcpy(&addr, &pinfo->prefix, 8);
2110
2111                         if (!ipv6_addr_any(&in6_dev->token)) {
2112                                 read_lock_bh(&in6_dev->lock);
2113                                 memcpy(addr.s6_addr + 8,
2114                                        in6_dev->token.s6_addr + 8, 8);
2115                                 read_unlock_bh(&in6_dev->lock);
2116                                 tokenized = true;
2117                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2118                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2119                                 in6_dev_put(in6_dev);
2120                                 return;
2121                         }
2122                         goto ok;
2123                 }
2124                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2125                                     pinfo->prefix_len);
2126                 in6_dev_put(in6_dev);
2127                 return;
2128
2129 ok:
2130
2131                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2132
2133                 if (ifp == NULL && valid_lft) {
2134                         int max_addresses = in6_dev->cnf.max_addresses;
2135                         u32 addr_flags = 0;
2136
2137 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2138                         if (in6_dev->cnf.optimistic_dad &&
2139                             !net->ipv6.devconf_all->forwarding && sllao)
2140                                 addr_flags = IFA_F_OPTIMISTIC;
2141 #endif
2142
2143                         /* Do not allow to create too much of autoconfigured
2144                          * addresses; this would be too easy way to crash kernel.
2145                          */
2146                         if (!max_addresses ||
2147                             ipv6_count_addresses(in6_dev) < max_addresses)
2148                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2149                                                     pinfo->prefix_len,
2150                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2151                                                     addr_flags, valid_lft,
2152                                                     prefered_lft);
2153
2154                         if (IS_ERR_OR_NULL(ifp)) {
2155                                 in6_dev_put(in6_dev);
2156                                 return;
2157                         }
2158
2159                         update_lft = 0;
2160                         create = 1;
2161                         ifp->cstamp = jiffies;
2162                         ifp->tokenized = tokenized;
2163                         addrconf_dad_start(ifp);
2164                 }
2165
2166                 if (ifp) {
2167                         int flags;
2168                         unsigned long now;
2169                         struct inet6_ifaddr *ift;
2170                         u32 stored_lft;
2171
2172                         /* update lifetime (RFC2462 5.5.3 e) */
2173                         spin_lock(&ifp->lock);
2174                         now = jiffies;
2175                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2176                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2177                         else
2178                                 stored_lft = 0;
2179                         if (!update_lft && !create && stored_lft) {
2180                                 const u32 minimum_lft = min(
2181                                         stored_lft, (u32)MIN_VALID_LIFETIME);
2182                                 valid_lft = max(valid_lft, minimum_lft);
2183
2184                                 /* RFC4862 Section 5.5.3e:
2185                                  * "Note that the preferred lifetime of the
2186                                  *  corresponding address is always reset to
2187                                  *  the Preferred Lifetime in the received
2188                                  *  Prefix Information option, regardless of
2189                                  *  whether the valid lifetime is also reset or
2190                                  *  ignored."
2191                                  *
2192                                  * So we should always update prefered_lft here.
2193                                  */
2194                                 update_lft = 1;
2195                         }
2196
2197                         if (update_lft) {
2198                                 ifp->valid_lft = valid_lft;
2199                                 ifp->prefered_lft = prefered_lft;
2200                                 ifp->tstamp = now;
2201                                 flags = ifp->flags;
2202                                 ifp->flags &= ~IFA_F_DEPRECATED;
2203                                 spin_unlock(&ifp->lock);
2204
2205                                 if (!(flags&IFA_F_TENTATIVE))
2206                                         ipv6_ifa_notify(0, ifp);
2207                         } else
2208                                 spin_unlock(&ifp->lock);
2209
2210                         read_lock_bh(&in6_dev->lock);
2211                         /* update all temporary addresses in the list */
2212                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2213                                             tmp_list) {
2214                                 int age, max_valid, max_prefered;
2215
2216                                 if (ifp != ift->ifpub)
2217                                         continue;
2218
2219                                 /*
2220                                  * RFC 4941 section 3.3:
2221                                  * If a received option will extend the lifetime
2222                                  * of a public address, the lifetimes of
2223                                  * temporary addresses should be extended,
2224                                  * subject to the overall constraint that no
2225                                  * temporary addresses should ever remain
2226                                  * "valid" or "preferred" for a time longer than
2227                                  * (TEMP_VALID_LIFETIME) or
2228                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2229                                  * respectively.
2230                                  */
2231                                 age = (now - ift->cstamp) / HZ;
2232                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2233                                 if (max_valid < 0)
2234                                         max_valid = 0;
2235
2236                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2237                                                in6_dev->cnf.max_desync_factor -
2238                                                age;
2239                                 if (max_prefered < 0)
2240                                         max_prefered = 0;
2241
2242                                 if (valid_lft > max_valid)
2243                                         valid_lft = max_valid;
2244
2245                                 if (prefered_lft > max_prefered)
2246                                         prefered_lft = max_prefered;
2247
2248                                 spin_lock(&ift->lock);
2249                                 flags = ift->flags;
2250                                 ift->valid_lft = valid_lft;
2251                                 ift->prefered_lft = prefered_lft;
2252                                 ift->tstamp = now;
2253                                 if (prefered_lft > 0)
2254                                         ift->flags &= ~IFA_F_DEPRECATED;
2255
2256                                 spin_unlock(&ift->lock);
2257                                 if (!(flags&IFA_F_TENTATIVE))
2258                                         ipv6_ifa_notify(0, ift);
2259                         }
2260
2261                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2262                                 /*
2263                                  * When a new public address is created as
2264                                  * described in [ADDRCONF], also create a new
2265                                  * temporary address. Also create a temporary
2266                                  * address if it's enabled but no temporary
2267                                  * address currently exists.
2268                                  */
2269                                 read_unlock_bh(&in6_dev->lock);
2270                                 ipv6_create_tempaddr(ifp, NULL);
2271                         } else {
2272                                 read_unlock_bh(&in6_dev->lock);
2273                         }
2274
2275                         in6_ifa_put(ifp);
2276                         addrconf_verify(0);
2277                 }
2278         }
2279         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2280         in6_dev_put(in6_dev);
2281 }
2282
2283 /*
2284  *      Set destination address.
2285  *      Special case for SIT interfaces where we create a new "virtual"
2286  *      device.
2287  */
2288 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2289 {
2290         struct in6_ifreq ireq;
2291         struct net_device *dev;
2292         int err = -EINVAL;
2293
2294         rtnl_lock();
2295
2296         err = -EFAULT;
2297         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2298                 goto err_exit;
2299
2300         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2301
2302         err = -ENODEV;
2303         if (dev == NULL)
2304                 goto err_exit;
2305
2306 #if IS_ENABLED(CONFIG_IPV6_SIT)
2307         if (dev->type == ARPHRD_SIT) {
2308                 const struct net_device_ops *ops = dev->netdev_ops;
2309                 struct ifreq ifr;
2310                 struct ip_tunnel_parm p;
2311
2312                 err = -EADDRNOTAVAIL;
2313                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2314                         goto err_exit;
2315
2316                 memset(&p, 0, sizeof(p));
2317                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2318                 p.iph.saddr = 0;
2319                 p.iph.version = 4;
2320                 p.iph.ihl = 5;
2321                 p.iph.protocol = IPPROTO_IPV6;
2322                 p.iph.ttl = 64;
2323                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2324
2325                 if (ops->ndo_do_ioctl) {
2326                         mm_segment_t oldfs = get_fs();
2327
2328                         set_fs(KERNEL_DS);
2329                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2330                         set_fs(oldfs);
2331                 } else
2332                         err = -EOPNOTSUPP;
2333
2334                 if (err == 0) {
2335                         err = -ENOBUFS;
2336                         dev = __dev_get_by_name(net, p.name);
2337                         if (!dev)
2338                                 goto err_exit;
2339                         err = dev_open(dev);
2340                 }
2341         }
2342 #endif
2343
2344 err_exit:
2345         rtnl_unlock();
2346         return err;
2347 }
2348
2349 /*
2350  *      Manual configuration of address on an interface
2351  */
2352 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2353                           const struct in6_addr *peer_pfx,
2354                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2355                           __u32 valid_lft)
2356 {
2357         struct inet6_ifaddr *ifp;
2358         struct inet6_dev *idev;
2359         struct net_device *dev;
2360         int scope;
2361         u32 flags;
2362         clock_t expires;
2363         unsigned long timeout;
2364
2365         ASSERT_RTNL();
2366
2367         if (plen > 128)
2368                 return -EINVAL;
2369
2370         /* check the lifetime */
2371         if (!valid_lft || prefered_lft > valid_lft)
2372                 return -EINVAL;
2373
2374         dev = __dev_get_by_index(net, ifindex);
2375         if (!dev)
2376                 return -ENODEV;
2377
2378         idev = addrconf_add_dev(dev);
2379         if (IS_ERR(idev))
2380                 return PTR_ERR(idev);
2381
2382         scope = ipv6_addr_scope(pfx);
2383
2384         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2385         if (addrconf_finite_timeout(timeout)) {
2386                 expires = jiffies_to_clock_t(timeout * HZ);
2387                 valid_lft = timeout;
2388                 flags = RTF_EXPIRES;
2389         } else {
2390                 expires = 0;
2391                 flags = 0;
2392                 ifa_flags |= IFA_F_PERMANENT;
2393         }
2394
2395         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2396         if (addrconf_finite_timeout(timeout)) {
2397                 if (timeout == 0)
2398                         ifa_flags |= IFA_F_DEPRECATED;
2399                 prefered_lft = timeout;
2400         }
2401
2402         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2403                             valid_lft, prefered_lft);
2404
2405         if (!IS_ERR(ifp)) {
2406                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2407                                       expires, flags);
2408                 /*
2409                  * Note that section 3.1 of RFC 4429 indicates
2410                  * that the Optimistic flag should not be set for
2411                  * manually configured addresses
2412                  */
2413                 addrconf_dad_start(ifp);
2414                 in6_ifa_put(ifp);
2415                 addrconf_verify(0);
2416                 return 0;
2417         }
2418
2419         return PTR_ERR(ifp);
2420 }
2421
2422 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2423                           unsigned int plen)
2424 {
2425         struct inet6_ifaddr *ifp;
2426         struct inet6_dev *idev;
2427         struct net_device *dev;
2428
2429         if (plen > 128)
2430                 return -EINVAL;
2431
2432         dev = __dev_get_by_index(net, ifindex);
2433         if (!dev)
2434                 return -ENODEV;
2435
2436         if ((idev = __in6_dev_get(dev)) == NULL)
2437                 return -ENXIO;
2438
2439         read_lock_bh(&idev->lock);
2440         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2441                 if (ifp->prefix_len == plen &&
2442                     ipv6_addr_equal(pfx, &ifp->addr)) {
2443                         in6_ifa_hold(ifp);
2444                         read_unlock_bh(&idev->lock);
2445
2446                         ipv6_del_addr(ifp);
2447                         return 0;
2448                 }
2449         }
2450         read_unlock_bh(&idev->lock);
2451         return -EADDRNOTAVAIL;
2452 }
2453
2454
2455 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2456 {
2457         struct in6_ifreq ireq;
2458         int err;
2459
2460         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2461                 return -EPERM;
2462
2463         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2464                 return -EFAULT;
2465
2466         rtnl_lock();
2467         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2468                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2469                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2470         rtnl_unlock();
2471         return err;
2472 }
2473
2474 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2475 {
2476         struct in6_ifreq ireq;
2477         int err;
2478
2479         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2480                 return -EPERM;
2481
2482         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2483                 return -EFAULT;
2484
2485         rtnl_lock();
2486         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2487                              ireq.ifr6_prefixlen);
2488         rtnl_unlock();
2489         return err;
2490 }
2491
2492 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2493                      int plen, int scope)
2494 {
2495         struct inet6_ifaddr *ifp;
2496
2497         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2498                             scope, IFA_F_PERMANENT, 0, 0);
2499         if (!IS_ERR(ifp)) {
2500                 spin_lock_bh(&ifp->lock);
2501                 ifp->flags &= ~IFA_F_TENTATIVE;
2502                 spin_unlock_bh(&ifp->lock);
2503                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2504                 in6_ifa_put(ifp);
2505         }
2506 }
2507
2508 #if IS_ENABLED(CONFIG_IPV6_SIT)
2509 static void sit_add_v4_addrs(struct inet6_dev *idev)
2510 {
2511         struct in6_addr addr;
2512         struct net_device *dev;
2513         struct net *net = dev_net(idev->dev);
2514         int scope, plen;
2515         u32 pflags = 0;
2516
2517         ASSERT_RTNL();
2518
2519         memset(&addr, 0, sizeof(struct in6_addr));
2520         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2521
2522         if (idev->dev->flags&IFF_POINTOPOINT) {
2523                 addr.s6_addr32[0] = htonl(0xfe800000);
2524                 scope = IFA_LINK;
2525                 plen = 64;
2526         } else {
2527                 scope = IPV6_ADDR_COMPATv4;
2528                 plen = 96;
2529                 pflags |= RTF_NONEXTHOP;
2530         }
2531
2532         if (addr.s6_addr32[3]) {
2533                 add_addr(idev, &addr, plen, scope);
2534                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2535                 return;
2536         }
2537
2538         for_each_netdev(net, dev) {
2539                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2540                 if (in_dev && (dev->flags & IFF_UP)) {
2541                         struct in_ifaddr *ifa;
2542
2543                         int flag = scope;
2544
2545                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2546
2547                                 addr.s6_addr32[3] = ifa->ifa_local;
2548
2549                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2550                                         continue;
2551                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2552                                         if (idev->dev->flags&IFF_POINTOPOINT)
2553                                                 continue;
2554                                         flag |= IFA_HOST;
2555                                 }
2556
2557                                 add_addr(idev, &addr, plen, flag);
2558                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2559                                                       pflags);
2560                         }
2561                 }
2562         }
2563 }
2564 #endif
2565
2566 static void init_loopback(struct net_device *dev)
2567 {
2568         struct inet6_dev  *idev;
2569         struct net_device *sp_dev;
2570         struct inet6_ifaddr *sp_ifa;
2571         struct rt6_info *sp_rt;
2572
2573         /* ::1 */
2574
2575         ASSERT_RTNL();
2576
2577         if ((idev = ipv6_find_idev(dev)) == NULL) {
2578                 pr_debug("%s: add_dev failed\n", __func__);
2579                 return;
2580         }
2581
2582         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2583
2584         /* Add routes to other interface's IPv6 addresses */
2585         for_each_netdev(dev_net(dev), sp_dev) {
2586                 if (!strcmp(sp_dev->name, dev->name))
2587                         continue;
2588
2589                 idev = __in6_dev_get(sp_dev);
2590                 if (!idev)
2591                         continue;
2592
2593                 read_lock_bh(&idev->lock);
2594                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2595
2596                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2597                                 continue;
2598
2599                         if (sp_ifa->rt)
2600                                 continue;
2601
2602                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2603
2604                         /* Failure cases are ignored */
2605                         if (!IS_ERR(sp_rt)) {
2606                                 sp_ifa->rt = sp_rt;
2607                                 ip6_ins_rt(sp_rt);
2608                         }
2609                 }
2610                 read_unlock_bh(&idev->lock);
2611         }
2612 }
2613
2614 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2615 {
2616         struct inet6_ifaddr *ifp;
2617         u32 addr_flags = IFA_F_PERMANENT;
2618
2619 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2620         if (idev->cnf.optimistic_dad &&
2621             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2622                 addr_flags |= IFA_F_OPTIMISTIC;
2623 #endif
2624
2625
2626         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2627         if (!IS_ERR(ifp)) {
2628                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2629                 addrconf_dad_start(ifp);
2630                 in6_ifa_put(ifp);
2631         }
2632 }
2633
2634 static void addrconf_dev_config(struct net_device *dev)
2635 {
2636         struct in6_addr addr;
2637         struct inet6_dev *idev;
2638
2639         ASSERT_RTNL();
2640
2641         if ((dev->type != ARPHRD_ETHER) &&
2642             (dev->type != ARPHRD_FDDI) &&
2643             (dev->type != ARPHRD_ARCNET) &&
2644             (dev->type != ARPHRD_INFINIBAND) &&
2645             (dev->type != ARPHRD_IEEE802154) &&
2646             (dev->type != ARPHRD_IEEE1394) &&
2647             (dev->type != ARPHRD_TUNNEL6)) {
2648                 /* Alas, we support only Ethernet autoconfiguration. */
2649                 return;
2650         }
2651
2652         idev = addrconf_add_dev(dev);
2653         if (IS_ERR(idev))
2654                 return;
2655
2656         memset(&addr, 0, sizeof(struct in6_addr));
2657         addr.s6_addr32[0] = htonl(0xFE800000);
2658
2659         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2660                 addrconf_add_linklocal(idev, &addr);
2661 }
2662
2663 #if IS_ENABLED(CONFIG_IPV6_SIT)
2664 static void addrconf_sit_config(struct net_device *dev)
2665 {
2666         struct inet6_dev *idev;
2667
2668         ASSERT_RTNL();
2669
2670         /*
2671          * Configure the tunnel with one of our IPv4
2672          * addresses... we should configure all of
2673          * our v4 addrs in the tunnel
2674          */
2675
2676         if ((idev = ipv6_find_idev(dev)) == NULL) {
2677                 pr_debug("%s: add_dev failed\n", __func__);
2678                 return;
2679         }
2680
2681         if (dev->priv_flags & IFF_ISATAP) {
2682                 struct in6_addr addr;
2683
2684                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2685                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2686                         addrconf_add_linklocal(idev, &addr);
2687                 return;
2688         }
2689
2690         sit_add_v4_addrs(idev);
2691
2692         if (dev->flags&IFF_POINTOPOINT)
2693                 addrconf_add_mroute(dev);
2694 }
2695 #endif
2696
2697 #if IS_ENABLED(CONFIG_NET_IPGRE)
2698 static void addrconf_gre_config(struct net_device *dev)
2699 {
2700         struct inet6_dev *idev;
2701         struct in6_addr addr;
2702
2703         ASSERT_RTNL();
2704
2705         if ((idev = ipv6_find_idev(dev)) == NULL) {
2706                 pr_debug("%s: add_dev failed\n", __func__);
2707                 return;
2708         }
2709
2710         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2711         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2712                 addrconf_add_linklocal(idev, &addr);
2713 }
2714 #endif
2715
2716 static inline int
2717 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2718 {
2719         struct in6_addr lladdr;
2720
2721         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2722                 addrconf_add_linklocal(idev, &lladdr);
2723                 return 0;
2724         }
2725         return -1;
2726 }
2727
2728 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2729                            void *ptr)
2730 {
2731         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2732         struct inet6_dev *idev = __in6_dev_get(dev);
2733         int run_pending = 0;
2734         int err;
2735
2736         switch (event) {
2737         case NETDEV_REGISTER:
2738                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2739                         idev = ipv6_add_dev(dev);
2740                         if (!idev)
2741                                 return notifier_from_errno(-ENOMEM);
2742                 }
2743                 break;
2744
2745         case NETDEV_UP:
2746         case NETDEV_CHANGE:
2747                 if (dev->flags & IFF_SLAVE)
2748                         break;
2749
2750                 if (event == NETDEV_UP) {
2751                         if (!addrconf_qdisc_ok(dev)) {
2752                                 /* device is not ready yet. */
2753                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2754                                         dev->name);
2755                                 break;
2756                         }
2757
2758                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2759                                 idev = ipv6_add_dev(dev);
2760
2761                         if (idev) {
2762                                 idev->if_flags |= IF_READY;
2763                                 run_pending = 1;
2764                         }
2765                 } else {
2766                         if (!addrconf_qdisc_ok(dev)) {
2767                                 /* device is still not ready. */
2768                                 break;
2769                         }
2770
2771                         if (idev) {
2772                                 if (idev->if_flags & IF_READY)
2773                                         /* device is already configured. */
2774                                         break;
2775                                 idev->if_flags |= IF_READY;
2776                         }
2777
2778                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2779                                 dev->name);
2780
2781                         run_pending = 1;
2782                 }
2783
2784                 switch (dev->type) {
2785 #if IS_ENABLED(CONFIG_IPV6_SIT)
2786                 case ARPHRD_SIT:
2787                         addrconf_sit_config(dev);
2788                         break;
2789 #endif
2790 #if IS_ENABLED(CONFIG_NET_IPGRE)
2791                 case ARPHRD_IPGRE:
2792                         addrconf_gre_config(dev);
2793                         break;
2794 #endif
2795                 case ARPHRD_LOOPBACK:
2796                         init_loopback(dev);
2797                         break;
2798
2799                 default:
2800                         addrconf_dev_config(dev);
2801                         break;
2802                 }
2803
2804                 if (idev) {
2805                         if (run_pending)
2806                                 addrconf_dad_run(idev);
2807
2808                         /*
2809                          * If the MTU changed during the interface down,
2810                          * when the interface up, the changed MTU must be
2811                          * reflected in the idev as well as routers.
2812                          */
2813                         if (idev->cnf.mtu6 != dev->mtu &&
2814                             dev->mtu >= IPV6_MIN_MTU) {
2815                                 rt6_mtu_change(dev, dev->mtu);
2816                                 idev->cnf.mtu6 = dev->mtu;
2817                         }
2818                         idev->tstamp = jiffies;
2819                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2820
2821                         /*
2822                          * If the changed mtu during down is lower than
2823                          * IPV6_MIN_MTU stop IPv6 on this interface.
2824                          */
2825                         if (dev->mtu < IPV6_MIN_MTU)
2826                                 addrconf_ifdown(dev, 1);
2827                 }
2828                 break;
2829
2830         case NETDEV_CHANGEMTU:
2831                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2832                         rt6_mtu_change(dev, dev->mtu);
2833                         idev->cnf.mtu6 = dev->mtu;
2834                         break;
2835                 }
2836
2837                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2838                         idev = ipv6_add_dev(dev);
2839                         if (idev)
2840                                 break;
2841                 }
2842
2843                 /*
2844                  * MTU falled under IPV6_MIN_MTU.
2845                  * Stop IPv6 on this interface.
2846                  */
2847
2848         case NETDEV_DOWN:
2849         case NETDEV_UNREGISTER:
2850                 /*
2851                  *      Remove all addresses from this interface.
2852                  */
2853                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2854                 break;
2855
2856         case NETDEV_CHANGENAME:
2857                 if (idev) {
2858                         snmp6_unregister_dev(idev);
2859                         addrconf_sysctl_unregister(idev);
2860                         addrconf_sysctl_register(idev);
2861                         err = snmp6_register_dev(idev);
2862                         if (err)
2863                                 return notifier_from_errno(err);
2864                 }
2865                 break;
2866
2867         case NETDEV_PRE_TYPE_CHANGE:
2868         case NETDEV_POST_TYPE_CHANGE:
2869                 addrconf_type_change(dev, event);
2870                 break;
2871         }
2872
2873         return NOTIFY_OK;
2874 }
2875
2876 /*
2877  *      addrconf module should be notified of a device going up
2878  */
2879 static struct notifier_block ipv6_dev_notf = {
2880         .notifier_call = addrconf_notify,
2881 };
2882
2883 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2884 {
2885         struct inet6_dev *idev;
2886         ASSERT_RTNL();
2887
2888         idev = __in6_dev_get(dev);
2889
2890         if (event == NETDEV_POST_TYPE_CHANGE)
2891                 ipv6_mc_remap(idev);
2892         else if (event == NETDEV_PRE_TYPE_CHANGE)
2893                 ipv6_mc_unmap(idev);
2894 }
2895
2896 static int addrconf_ifdown(struct net_device *dev, int how)
2897 {
2898         struct net *net = dev_net(dev);
2899         struct inet6_dev *idev;
2900         struct inet6_ifaddr *ifa;
2901         int state, i;
2902
2903         ASSERT_RTNL();
2904
2905         rt6_ifdown(net, dev);
2906         neigh_ifdown(&nd_tbl, dev);
2907
2908         idev = __in6_dev_get(dev);
2909         if (idev == NULL)
2910                 return -ENODEV;
2911
2912         /*
2913          * Step 1: remove reference to ipv6 device from parent device.
2914          *         Do not dev_put!
2915          */
2916         if (how) {
2917                 idev->dead = 1;
2918
2919                 /* protected by rtnl_lock */
2920                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2921
2922                 /* Step 1.5: remove snmp6 entry */
2923                 snmp6_unregister_dev(idev);
2924
2925         }
2926
2927         /* Step 2: clear hash table */
2928         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2929                 struct hlist_head *h = &inet6_addr_lst[i];
2930
2931                 spin_lock_bh(&addrconf_hash_lock);
2932         restart:
2933                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2934                         if (ifa->idev == idev) {
2935                                 hlist_del_init_rcu(&ifa->addr_lst);
2936                                 addrconf_del_dad_timer(ifa);
2937                                 goto restart;
2938                         }
2939                 }
2940                 spin_unlock_bh(&addrconf_hash_lock);
2941         }
2942
2943         write_lock_bh(&idev->lock);
2944
2945         addrconf_del_rs_timer(idev);
2946
2947         /* Step 2: clear flags for stateless addrconf */
2948         if (!how)
2949                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2950
2951         if (how && del_timer(&idev->regen_timer))
2952                 in6_dev_put(idev);
2953
2954         /* Step 3: clear tempaddr list */
2955         while (!list_empty(&idev->tempaddr_list)) {
2956                 ifa = list_first_entry(&idev->tempaddr_list,
2957                                        struct inet6_ifaddr, tmp_list);
2958                 list_del(&ifa->tmp_list);
2959                 write_unlock_bh(&idev->lock);
2960                 spin_lock_bh(&ifa->lock);
2961
2962                 if (ifa->ifpub) {
2963                         in6_ifa_put(ifa->ifpub);
2964                         ifa->ifpub = NULL;
2965                 }
2966                 spin_unlock_bh(&ifa->lock);
2967                 in6_ifa_put(ifa);
2968                 write_lock_bh(&idev->lock);
2969         }
2970
2971         while (!list_empty(&idev->addr_list)) {
2972                 ifa = list_first_entry(&idev->addr_list,
2973                                        struct inet6_ifaddr, if_list);
2974                 addrconf_del_dad_timer(ifa);
2975
2976                 list_del(&ifa->if_list);
2977
2978                 write_unlock_bh(&idev->lock);
2979
2980                 spin_lock_bh(&ifa->state_lock);
2981                 state = ifa->state;
2982                 ifa->state = INET6_IFADDR_STATE_DEAD;
2983                 spin_unlock_bh(&ifa->state_lock);
2984
2985                 if (state != INET6_IFADDR_STATE_DEAD) {
2986                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
2987                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
2988                 }
2989                 in6_ifa_put(ifa);
2990
2991                 write_lock_bh(&idev->lock);
2992         }
2993
2994         write_unlock_bh(&idev->lock);
2995
2996         /* Step 5: Discard multicast list */
2997         if (how)
2998                 ipv6_mc_destroy_dev(idev);
2999         else
3000                 ipv6_mc_down(idev);
3001
3002         idev->tstamp = jiffies;
3003
3004         /* Last: Shot the device (if unregistered) */
3005         if (how) {
3006                 addrconf_sysctl_unregister(idev);
3007                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3008                 neigh_ifdown(&nd_tbl, dev);
3009                 in6_dev_put(idev);
3010         }
3011         return 0;
3012 }
3013
3014 static void addrconf_rs_timer(unsigned long data)
3015 {
3016         struct inet6_dev *idev = (struct inet6_dev *)data;
3017         struct net_device *dev = idev->dev;
3018         struct in6_addr lladdr;
3019
3020         write_lock(&idev->lock);
3021         if (idev->dead || !(idev->if_flags & IF_READY))
3022                 goto out;
3023
3024         if (!ipv6_accept_ra(idev))
3025                 goto out;
3026
3027         /* Announcement received after solicitation was sent */
3028         if (idev->if_flags & IF_RA_RCVD)
3029                 goto out;
3030
3031         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3032                 write_unlock(&idev->lock);
3033                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3034                         ndisc_send_rs(dev, &lladdr,
3035                                       &in6addr_linklocal_allrouters);
3036                 else
3037                         goto put;
3038
3039                 write_lock(&idev->lock);
3040                 /* The wait after the last probe can be shorter */
3041                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3042                                              idev->cnf.rtr_solicits) ?
3043                                       idev->cnf.rtr_solicit_delay :
3044                                       idev->cnf.rtr_solicit_interval);
3045         } else {
3046                 /*
3047                  * Note: we do not support deprecated "all on-link"
3048                  * assumption any longer.
3049                  */
3050                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3051         }
3052
3053 out:
3054         write_unlock(&idev->lock);
3055 put:
3056         in6_dev_put(idev);
3057 }
3058
3059 /*
3060  *      Duplicate Address Detection
3061  */
3062 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3063 {
3064         unsigned long rand_num;
3065         struct inet6_dev *idev = ifp->idev;
3066
3067         if (ifp->flags & IFA_F_OPTIMISTIC)
3068                 rand_num = 0;
3069         else
3070                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3071
3072         ifp->dad_probes = idev->cnf.dad_transmits;
3073         addrconf_mod_dad_timer(ifp, rand_num);
3074 }
3075
3076 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3077 {
3078         struct inet6_dev *idev = ifp->idev;
3079         struct net_device *dev = idev->dev;
3080
3081         addrconf_join_solict(dev, &ifp->addr);
3082
3083         net_srandom(ifp->addr.s6_addr32[3]);
3084
3085         read_lock_bh(&idev->lock);
3086         spin_lock(&ifp->lock);
3087         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3088                 goto out;
3089
3090         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3091             idev->cnf.accept_dad < 1 ||
3092             !(ifp->flags&IFA_F_TENTATIVE) ||
3093             ifp->flags & IFA_F_NODAD) {
3094                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3095                 spin_unlock(&ifp->lock);
3096                 read_unlock_bh(&idev->lock);
3097
3098                 addrconf_dad_completed(ifp);
3099                 return;
3100         }
3101
3102         if (!(idev->if_flags & IF_READY)) {
3103                 spin_unlock(&ifp->lock);
3104                 read_unlock_bh(&idev->lock);
3105                 /*
3106                  * If the device is not ready:
3107                  * - keep it tentative if it is a permanent address.
3108                  * - otherwise, kill it.
3109                  */
3110                 in6_ifa_hold(ifp);
3111                 addrconf_dad_stop(ifp, 0);
3112                 return;
3113         }
3114
3115         /*
3116          * Optimistic nodes can start receiving
3117          * Frames right away
3118          */
3119         if (ifp->flags & IFA_F_OPTIMISTIC)
3120                 ip6_ins_rt(ifp->rt);
3121
3122         addrconf_dad_kick(ifp);
3123 out:
3124         spin_unlock(&ifp->lock);
3125         read_unlock_bh(&idev->lock);
3126 }
3127
3128 static void addrconf_dad_timer(unsigned long data)
3129 {
3130         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3131         struct inet6_dev *idev = ifp->idev;
3132         struct in6_addr mcaddr;
3133
3134         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3135                 goto out;
3136
3137         write_lock(&idev->lock);
3138         if (idev->dead || !(idev->if_flags & IF_READY)) {
3139                 write_unlock(&idev->lock);
3140                 goto out;
3141         }
3142
3143         spin_lock(&ifp->lock);
3144         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3145                 spin_unlock(&ifp->lock);
3146                 write_unlock(&idev->lock);
3147                 goto out;
3148         }
3149
3150         if (ifp->dad_probes == 0) {
3151                 /*
3152                  * DAD was successful
3153                  */
3154
3155                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3156                 spin_unlock(&ifp->lock);
3157                 write_unlock(&idev->lock);
3158
3159                 addrconf_dad_completed(ifp);
3160
3161                 goto out;
3162         }
3163
3164         ifp->dad_probes--;
3165         addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3166         spin_unlock(&ifp->lock);
3167         write_unlock(&idev->lock);
3168
3169         /* send a neighbour solicitation for our addr */
3170         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3171         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3172 out:
3173         in6_ifa_put(ifp);
3174 }
3175
3176 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3177 {
3178         struct net_device *dev = ifp->idev->dev;
3179         struct in6_addr lladdr;
3180         bool send_rs, send_mld;
3181
3182         addrconf_del_dad_timer(ifp);
3183
3184         /*
3185          *      Configure the address for reception. Now it is valid.
3186          */
3187
3188         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3189
3190         /* If added prefix is link local and we are prepared to process
3191            router advertisements, start sending router solicitations.
3192          */
3193
3194         read_lock_bh(&ifp->idev->lock);
3195         spin_lock(&ifp->lock);
3196         send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3197                    ifp->idev->valid_ll_addr_cnt == 1;
3198         send_rs = send_mld &&
3199                   ipv6_accept_ra(ifp->idev) &&
3200                   ifp->idev->cnf.rtr_solicits > 0 &&
3201                   (dev->flags&IFF_LOOPBACK) == 0;
3202         spin_unlock(&ifp->lock);
3203         read_unlock_bh(&ifp->idev->lock);
3204
3205         /* While dad is in progress mld report's source address is in6_addrany.
3206          * Resend with proper ll now.
3207          */
3208         if (send_mld)
3209                 ipv6_mc_dad_complete(ifp->idev);
3210
3211         if (send_rs) {
3212                 /*
3213                  *      If a host as already performed a random delay
3214                  *      [...] as part of DAD [...] there is no need
3215                  *      to delay again before sending the first RS
3216                  */
3217                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3218                         return;
3219                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3220
3221                 write_lock_bh(&ifp->idev->lock);
3222                 spin_lock(&ifp->lock);
3223                 ifp->idev->rs_probes = 1;
3224                 ifp->idev->if_flags |= IF_RS_SENT;
3225                 addrconf_mod_rs_timer(ifp->idev,
3226                                       ifp->idev->cnf.rtr_solicit_interval);
3227                 spin_unlock(&ifp->lock);
3228                 write_unlock_bh(&ifp->idev->lock);
3229         }
3230 }
3231
3232 static void addrconf_dad_run(struct inet6_dev *idev)
3233 {
3234         struct inet6_ifaddr *ifp;
3235
3236         read_lock_bh(&idev->lock);
3237         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3238                 spin_lock(&ifp->lock);
3239                 if (ifp->flags & IFA_F_TENTATIVE &&
3240                     ifp->state == INET6_IFADDR_STATE_DAD)
3241                         addrconf_dad_kick(ifp);
3242                 spin_unlock(&ifp->lock);
3243         }
3244         read_unlock_bh(&idev->lock);
3245 }
3246
3247 #ifdef CONFIG_PROC_FS
3248 struct if6_iter_state {
3249         struct seq_net_private p;
3250         int bucket;
3251         int offset;
3252 };
3253
3254 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3255 {
3256         struct inet6_ifaddr *ifa = NULL;
3257         struct if6_iter_state *state = seq->private;
3258         struct net *net = seq_file_net(seq);
3259         int p = 0;
3260
3261         /* initial bucket if pos is 0 */
3262         if (pos == 0) {
3263                 state->bucket = 0;
3264                 state->offset = 0;
3265         }
3266
3267         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3268                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3269                                          addr_lst) {
3270                         if (!net_eq(dev_net(ifa->idev->dev), net))
3271                                 continue;
3272                         /* sync with offset */
3273                         if (p < state->offset) {
3274                                 p++;
3275                                 continue;
3276                         }
3277                         state->offset++;
3278                         return ifa;
3279                 }
3280
3281                 /* prepare for next bucket */
3282                 state->offset = 0;
3283                 p = 0;
3284         }
3285         return NULL;
3286 }
3287
3288 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3289                                          struct inet6_ifaddr *ifa)
3290 {
3291         struct if6_iter_state *state = seq->private;
3292         struct net *net = seq_file_net(seq);
3293
3294         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3295                 if (!net_eq(dev_net(ifa->idev->dev), net))
3296                         continue;
3297                 state->offset++;
3298                 return ifa;
3299         }
3300
3301         while (++state->bucket < IN6_ADDR_HSIZE) {
3302                 state->offset = 0;
3303                 hlist_for_each_entry_rcu_bh(ifa,
3304                                      &inet6_addr_lst[state->bucket], addr_lst) {
3305                         if (!net_eq(dev_net(ifa->idev->dev), net))
3306                                 continue;
3307                         state->offset++;
3308                         return ifa;
3309                 }
3310         }
3311
3312         return NULL;
3313 }
3314
3315 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3316         __acquires(rcu_bh)
3317 {
3318         rcu_read_lock_bh();
3319         return if6_get_first(seq, *pos);
3320 }
3321
3322 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3323 {
3324         struct inet6_ifaddr *ifa;
3325
3326         ifa = if6_get_next(seq, v);
3327         ++*pos;
3328         return ifa;
3329 }
3330
3331 static void if6_seq_stop(struct seq_file *seq, void *v)
3332         __releases(rcu_bh)
3333 {
3334         rcu_read_unlock_bh();
3335 }
3336
3337 static int if6_seq_show(struct seq_file *seq, void *v)
3338 {
3339         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3340         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3341                    &ifp->addr,
3342                    ifp->idev->dev->ifindex,
3343                    ifp->prefix_len,
3344                    ifp->scope,
3345                    ifp->flags,
3346                    ifp->idev->dev->name);
3347         return 0;
3348 }
3349
3350 static const struct seq_operations if6_seq_ops = {
3351         .start  = if6_seq_start,
3352         .next   = if6_seq_next,
3353         .show   = if6_seq_show,
3354         .stop   = if6_seq_stop,
3355 };
3356
3357 static int if6_seq_open(struct inode *inode, struct file *file)
3358 {
3359         return seq_open_net(inode, file, &if6_seq_ops,
3360                             sizeof(struct if6_iter_state));
3361 }
3362
3363 static const struct file_operations if6_fops = {
3364         .owner          = THIS_MODULE,
3365         .open           = if6_seq_open,
3366         .read           = seq_read,
3367         .llseek         = seq_lseek,
3368         .release        = seq_release_net,
3369 };
3370
3371 static int __net_init if6_proc_net_init(struct net *net)
3372 {
3373         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3374                 return -ENOMEM;
3375         return 0;
3376 }
3377
3378 static void __net_exit if6_proc_net_exit(struct net *net)
3379 {
3380         remove_proc_entry("if_inet6", net->proc_net);
3381 }
3382
3383 static struct pernet_operations if6_proc_net_ops = {
3384        .init = if6_proc_net_init,
3385        .exit = if6_proc_net_exit,
3386 };
3387
3388 int __init if6_proc_init(void)
3389 {
3390         return register_pernet_subsys(&if6_proc_net_ops);
3391 }
3392
3393 void if6_proc_exit(void)
3394 {
3395         unregister_pernet_subsys(&if6_proc_net_ops);
3396 }
3397 #endif  /* CONFIG_PROC_FS */
3398
3399 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3400 /* Check if address is a home address configured on any interface. */
3401 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3402 {
3403         int ret = 0;
3404         struct inet6_ifaddr *ifp = NULL;
3405         unsigned int hash = inet6_addr_hash(addr);
3406
3407         rcu_read_lock_bh();
3408         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3409                 if (!net_eq(dev_net(ifp->idev->dev), net))
3410                         continue;
3411                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3412                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3413                         ret = 1;
3414                         break;
3415                 }
3416         }
3417         rcu_read_unlock_bh();
3418         return ret;
3419 }
3420 #endif
3421
3422 /*
3423  *      Periodic address status verification
3424  */
3425
3426 static void addrconf_verify(unsigned long foo)
3427 {
3428         unsigned long now, next, next_sec, next_sched;
3429         struct inet6_ifaddr *ifp;
3430         int i;
3431
3432         rcu_read_lock_bh();
3433         spin_lock(&addrconf_verify_lock);
3434         now = jiffies;
3435         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3436
3437         del_timer(&addr_chk_timer);
3438
3439         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3440 restart:
3441                 hlist_for_each_entry_rcu_bh(ifp,
3442                                          &inet6_addr_lst[i], addr_lst) {
3443                         unsigned long age;
3444
3445                         if (ifp->flags & IFA_F_PERMANENT)
3446                                 continue;
3447
3448                         spin_lock(&ifp->lock);
3449                         /* We try to batch several events at once. */
3450                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3451
3452                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3453                             age >= ifp->valid_lft) {
3454                                 spin_unlock(&ifp->lock);
3455                                 in6_ifa_hold(ifp);
3456                                 ipv6_del_addr(ifp);
3457                                 goto restart;
3458                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3459                                 spin_unlock(&ifp->lock);
3460                                 continue;
3461                         } else if (age >= ifp->prefered_lft) {
3462                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3463                                 int deprecate = 0;
3464
3465                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3466                                         deprecate = 1;
3467                                         ifp->flags |= IFA_F_DEPRECATED;
3468                                 }
3469
3470                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3471                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3472
3473                                 spin_unlock(&ifp->lock);
3474
3475                                 if (deprecate) {
3476                                         in6_ifa_hold(ifp);
3477
3478                                         ipv6_ifa_notify(0, ifp);
3479                                         in6_ifa_put(ifp);
3480                                         goto restart;
3481                                 }
3482                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3483                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3484                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3485                                         ifp->idev->cnf.dad_transmits *
3486                                         ifp->idev->nd_parms->retrans_time / HZ;
3487
3488                                 if (age >= ifp->prefered_lft - regen_advance) {
3489                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3490                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3491                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3492                                         if (!ifp->regen_count && ifpub) {
3493                                                 ifp->regen_count++;
3494                                                 in6_ifa_hold(ifp);
3495                                                 in6_ifa_hold(ifpub);
3496                                                 spin_unlock(&ifp->lock);
3497
3498                                                 spin_lock(&ifpub->lock);
3499                                                 ifpub->regen_count = 0;
3500                                                 spin_unlock(&ifpub->lock);
3501                                                 ipv6_create_tempaddr(ifpub, ifp);
3502                                                 in6_ifa_put(ifpub);
3503                                                 in6_ifa_put(ifp);
3504                                                 goto restart;
3505                                         }
3506                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3507                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3508                                 spin_unlock(&ifp->lock);
3509                         } else {
3510                                 /* ifp->prefered_lft <= ifp->valid_lft */
3511                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3512                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3513                                 spin_unlock(&ifp->lock);
3514                         }
3515                 }
3516         }
3517
3518         next_sec = round_jiffies_up(next);
3519         next_sched = next;
3520
3521         /* If rounded timeout is accurate enough, accept it. */
3522         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3523                 next_sched = next_sec;
3524
3525         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3526         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3527                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3528
3529         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3530               now, next, next_sec, next_sched);
3531
3532         addr_chk_timer.expires = next_sched;
3533         add_timer(&addr_chk_timer);
3534         spin_unlock(&addrconf_verify_lock);
3535         rcu_read_unlock_bh();
3536 }
3537
3538 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3539                                      struct in6_addr **peer_pfx)
3540 {
3541         struct in6_addr *pfx = NULL;
3542
3543         *peer_pfx = NULL;
3544
3545         if (addr)
3546                 pfx = nla_data(addr);
3547
3548         if (local) {
3549                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3550                         *peer_pfx = pfx;
3551                 pfx = nla_data(local);
3552         }
3553
3554         return pfx;
3555 }
3556
3557 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3558         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3559         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3560         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3561 };
3562
3563 static int
3564 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3565 {
3566         struct net *net = sock_net(skb->sk);
3567         struct ifaddrmsg *ifm;
3568         struct nlattr *tb[IFA_MAX+1];
3569         struct in6_addr *pfx, *peer_pfx;
3570         int err;
3571
3572         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3573         if (err < 0)
3574                 return err;
3575
3576         ifm = nlmsg_data(nlh);
3577         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3578         if (pfx == NULL)
3579                 return -EINVAL;
3580
3581         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3582 }
3583
3584 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3585                              u32 prefered_lft, u32 valid_lft)
3586 {
3587         u32 flags;
3588         clock_t expires;
3589         unsigned long timeout;
3590
3591         if (!valid_lft || (prefered_lft > valid_lft))
3592                 return -EINVAL;
3593
3594         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3595         if (addrconf_finite_timeout(timeout)) {
3596                 expires = jiffies_to_clock_t(timeout * HZ);
3597                 valid_lft = timeout;
3598                 flags = RTF_EXPIRES;
3599         } else {
3600                 expires = 0;
3601                 flags = 0;
3602                 ifa_flags |= IFA_F_PERMANENT;
3603         }
3604
3605         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3606         if (addrconf_finite_timeout(timeout)) {
3607                 if (timeout == 0)
3608                         ifa_flags |= IFA_F_DEPRECATED;
3609                 prefered_lft = timeout;
3610         }
3611
3612         spin_lock_bh(&ifp->lock);
3613         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3614         ifp->tstamp = jiffies;
3615         ifp->valid_lft = valid_lft;
3616         ifp->prefered_lft = prefered_lft;
3617
3618         spin_unlock_bh(&ifp->lock);
3619         if (!(ifp->flags&IFA_F_TENTATIVE))
3620                 ipv6_ifa_notify(0, ifp);
3621
3622         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3623                               expires, flags);
3624         addrconf_verify(0);
3625
3626         return 0;
3627 }
3628
3629 static int
3630 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3631 {
3632         struct net *net = sock_net(skb->sk);
3633         struct ifaddrmsg *ifm;
3634         struct nlattr *tb[IFA_MAX+1];
3635         struct in6_addr *pfx, *peer_pfx;
3636         struct inet6_ifaddr *ifa;
3637         struct net_device *dev;
3638         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3639         u8 ifa_flags;
3640         int err;
3641
3642         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3643         if (err < 0)
3644                 return err;
3645
3646         ifm = nlmsg_data(nlh);
3647         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3648         if (pfx == NULL)
3649                 return -EINVAL;
3650
3651         if (tb[IFA_CACHEINFO]) {
3652                 struct ifa_cacheinfo *ci;
3653
3654                 ci = nla_data(tb[IFA_CACHEINFO]);
3655                 valid_lft = ci->ifa_valid;
3656                 preferred_lft = ci->ifa_prefered;
3657         } else {
3658                 preferred_lft = INFINITY_LIFE_TIME;
3659                 valid_lft = INFINITY_LIFE_TIME;
3660         }
3661
3662         dev =  __dev_get_by_index(net, ifm->ifa_index);
3663         if (dev == NULL)
3664                 return -ENODEV;
3665
3666         /* We ignore other flags so far. */
3667         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3668
3669         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3670         if (ifa == NULL) {
3671                 /*
3672                  * It would be best to check for !NLM_F_CREATE here but
3673                  * userspace alreay relies on not having to provide this.
3674                  */
3675                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3676                                       ifm->ifa_prefixlen, ifa_flags,
3677                                       preferred_lft, valid_lft);
3678         }
3679
3680         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3681             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3682                 err = -EEXIST;
3683         else
3684                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3685
3686         in6_ifa_put(ifa);
3687
3688         return err;
3689 }
3690
3691 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3692                           u8 scope, int ifindex)
3693 {
3694         struct ifaddrmsg *ifm;
3695
3696         ifm = nlmsg_data(nlh);
3697         ifm->ifa_family = AF_INET6;
3698         ifm->ifa_prefixlen = prefixlen;
3699         ifm->ifa_flags = flags;
3700         ifm->ifa_scope = scope;
3701         ifm->ifa_index = ifindex;
3702 }
3703
3704 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3705                          unsigned long tstamp, u32 preferred, u32 valid)
3706 {
3707         struct ifa_cacheinfo ci;
3708
3709         ci.cstamp = cstamp_delta(cstamp);
3710         ci.tstamp = cstamp_delta(tstamp);
3711         ci.ifa_prefered = preferred;
3712         ci.ifa_valid = valid;
3713
3714         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3715 }
3716
3717 static inline int rt_scope(int ifa_scope)
3718 {
3719         if (ifa_scope & IFA_HOST)
3720                 return RT_SCOPE_HOST;
3721         else if (ifa_scope & IFA_LINK)
3722                 return RT_SCOPE_LINK;
3723         else if (ifa_scope & IFA_SITE)
3724                 return RT_SCOPE_SITE;
3725         else
3726                 return RT_SCOPE_UNIVERSE;
3727 }
3728
3729 static inline int inet6_ifaddr_msgsize(void)
3730 {
3731         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3732                + nla_total_size(16) /* IFA_LOCAL */
3733                + nla_total_size(16) /* IFA_ADDRESS */
3734                + nla_total_size(sizeof(struct ifa_cacheinfo));
3735 }
3736
3737 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3738                              u32 portid, u32 seq, int event, unsigned int flags)
3739 {
3740         struct nlmsghdr  *nlh;
3741         u32 preferred, valid;
3742
3743         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3744         if (nlh == NULL)
3745                 return -EMSGSIZE;
3746
3747         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3748                       ifa->idev->dev->ifindex);
3749
3750         if (!(ifa->flags&IFA_F_PERMANENT)) {
3751                 preferred = ifa->prefered_lft;
3752                 valid = ifa->valid_lft;
3753                 if (preferred != INFINITY_LIFE_TIME) {
3754                         long tval = (jiffies - ifa->tstamp)/HZ;
3755                         if (preferred > tval)
3756                                 preferred -= tval;
3757                         else
3758                                 preferred = 0;
3759                         if (valid != INFINITY_LIFE_TIME) {
3760                                 if (valid > tval)
3761                                         valid -= tval;
3762                                 else
3763                                         valid = 0;
3764                         }
3765                 }
3766         } else {
3767                 preferred = INFINITY_LIFE_TIME;
3768                 valid = INFINITY_LIFE_TIME;
3769         }
3770
3771         if (!ipv6_addr_any(&ifa->peer_addr)) {
3772                 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3773                     nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3774                         goto error;
3775         } else
3776                 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3777                         goto error;
3778
3779         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3780                 goto error;
3781
3782         return nlmsg_end(skb, nlh);
3783
3784 error:
3785         nlmsg_cancel(skb, nlh);
3786         return -EMSGSIZE;
3787 }
3788
3789 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3790                                 u32 portid, u32 seq, int event, u16 flags)
3791 {
3792         struct nlmsghdr  *nlh;
3793         u8 scope = RT_SCOPE_UNIVERSE;
3794         int ifindex = ifmca->idev->dev->ifindex;
3795
3796         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3797                 scope = RT_SCOPE_SITE;
3798
3799         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3800         if (nlh == NULL)
3801                 return -EMSGSIZE;
3802
3803         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3804         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3805             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3806                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3807                 nlmsg_cancel(skb, nlh);
3808                 return -EMSGSIZE;
3809         }
3810
3811         return nlmsg_end(skb, nlh);
3812 }
3813
3814 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3815                                 u32 portid, u32 seq, int event, unsigned int flags)
3816 {
3817         struct nlmsghdr  *nlh;
3818         u8 scope = RT_SCOPE_UNIVERSE;
3819         int ifindex = ifaca->aca_idev->dev->ifindex;
3820
3821         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3822                 scope = RT_SCOPE_SITE;
3823
3824         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3825         if (nlh == NULL)
3826                 return -EMSGSIZE;
3827
3828         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3829         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3830             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3831                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3832                 nlmsg_cancel(skb, nlh);
3833                 return -EMSGSIZE;
3834         }
3835
3836         return nlmsg_end(skb, nlh);
3837 }
3838
3839 enum addr_type_t {
3840         UNICAST_ADDR,
3841         MULTICAST_ADDR,
3842         ANYCAST_ADDR,
3843 };
3844
3845 /* called with rcu_read_lock() */
3846 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3847                           struct netlink_callback *cb, enum addr_type_t type,
3848                           int s_ip_idx, int *p_ip_idx)
3849 {
3850         struct ifmcaddr6 *ifmca;
3851         struct ifacaddr6 *ifaca;
3852         int err = 1;
3853         int ip_idx = *p_ip_idx;
3854
3855         read_lock_bh(&idev->lock);
3856         switch (type) {
3857         case UNICAST_ADDR: {
3858                 struct inet6_ifaddr *ifa;
3859
3860                 /* unicast address incl. temp addr */
3861                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3862                         if (++ip_idx < s_ip_idx)
3863                                 continue;
3864                         err = inet6_fill_ifaddr(skb, ifa,
3865                                                 NETLINK_CB(cb->skb).portid,
3866                                                 cb->nlh->nlmsg_seq,
3867                                                 RTM_NEWADDR,
3868                                                 NLM_F_MULTI);
3869                         if (err <= 0)
3870                                 break;
3871                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3872                 }
3873                 break;
3874         }
3875         case MULTICAST_ADDR:
3876                 /* multicast address */
3877                 for (ifmca = idev->mc_list; ifmca;
3878                      ifmca = ifmca->next, ip_idx++) {
3879                         if (ip_idx < s_ip_idx)
3880                                 continue;
3881                         err = inet6_fill_ifmcaddr(skb, ifmca,
3882                                                   NETLINK_CB(cb->skb).portid,
3883                                                   cb->nlh->nlmsg_seq,
3884                                                   RTM_GETMULTICAST,
3885                                                   NLM_F_MULTI);
3886                         if (err <= 0)
3887                                 break;
3888                 }
3889                 break;
3890         case ANYCAST_ADDR:
3891                 /* anycast address */
3892                 for (ifaca = idev->ac_list; ifaca;
3893                      ifaca = ifaca->aca_next, ip_idx++) {
3894                         if (ip_idx < s_ip_idx)
3895                                 continue;
3896                         err = inet6_fill_ifacaddr(skb, ifaca,
3897                                                   NETLINK_CB(cb->skb).portid,
3898                                                   cb->nlh->nlmsg_seq,
3899                                                   RTM_GETANYCAST,
3900                                                   NLM_F_MULTI);
3901                         if (err <= 0)
3902                                 break;
3903                 }
3904                 break;
3905         default:
3906                 break;
3907         }
3908         read_unlock_bh(&idev->lock);
3909         *p_ip_idx = ip_idx;
3910         return err;
3911 }
3912
3913 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3914                            enum addr_type_t type)
3915 {
3916         struct net *net = sock_net(skb->sk);
3917         int h, s_h;
3918         int idx, ip_idx;
3919         int s_idx, s_ip_idx;
3920         struct net_device *dev;
3921         struct inet6_dev *idev;
3922         struct hlist_head *head;
3923
3924         s_h = cb->args[0];
3925         s_idx = idx = cb->args[1];
3926         s_ip_idx = ip_idx = cb->args[2];
3927
3928         rcu_read_lock();
3929         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3930         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3931                 idx = 0;
3932                 head = &net->dev_index_head[h];
3933                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3934                         if (idx < s_idx)
3935                                 goto cont;
3936                         if (h > s_h || idx > s_idx)
3937                                 s_ip_idx = 0;
3938                         ip_idx = 0;
3939                         idev = __in6_dev_get(dev);
3940                         if (!idev)
3941                                 goto cont;
3942
3943                         if (in6_dump_addrs(idev, skb, cb, type,
3944                                            s_ip_idx, &ip_idx) <= 0)
3945                                 goto done;
3946 cont:
3947                         idx++;
3948                 }
3949         }
3950 done:
3951         rcu_read_unlock();
3952         cb->args[0] = h;
3953         cb->args[1] = idx;
3954         cb->args[2] = ip_idx;
3955
3956         return skb->len;
3957 }
3958
3959 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3960 {
3961         enum addr_type_t type = UNICAST_ADDR;
3962
3963         return inet6_dump_addr(skb, cb, type);
3964 }
3965
3966 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3967 {
3968         enum addr_type_t type = MULTICAST_ADDR;
3969
3970         return inet6_dump_addr(skb, cb, type);
3971 }
3972
3973
3974 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3975 {
3976         enum addr_type_t type = ANYCAST_ADDR;
3977
3978         return inet6_dump_addr(skb, cb, type);
3979 }
3980
3981 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3982 {
3983         struct net *net = sock_net(in_skb->sk);
3984         struct ifaddrmsg *ifm;
3985         struct nlattr *tb[IFA_MAX+1];
3986         struct in6_addr *addr = NULL, *peer;
3987         struct net_device *dev = NULL;
3988         struct inet6_ifaddr *ifa;
3989         struct sk_buff *skb;
3990         int err;
3991
3992         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3993         if (err < 0)
3994                 goto errout;
3995
3996         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
3997         if (addr == NULL) {
3998                 err = -EINVAL;
3999                 goto errout;
4000         }
4001
4002         ifm = nlmsg_data(nlh);
4003         if (ifm->ifa_index)
4004                 dev = __dev_get_by_index(net, ifm->ifa_index);
4005
4006         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4007         if (!ifa) {
4008                 err = -EADDRNOTAVAIL;
4009                 goto errout;
4010         }
4011
4012         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4013         if (!skb) {
4014                 err = -ENOBUFS;
4015                 goto errout_ifa;
4016         }
4017
4018         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4019                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4020         if (err < 0) {
4021                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4022                 WARN_ON(err == -EMSGSIZE);
4023                 kfree_skb(skb);
4024                 goto errout_ifa;
4025         }
4026         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4027 errout_ifa:
4028         in6_ifa_put(ifa);
4029 errout:
4030         return err;
4031 }
4032
4033 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4034 {
4035         struct sk_buff *skb;
4036         struct net *net = dev_net(ifa->idev->dev);
4037         int err = -ENOBUFS;
4038
4039         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4040         if (skb == NULL)
4041                 goto errout;
4042
4043         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4044         if (err < 0) {
4045                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4046                 WARN_ON(err == -EMSGSIZE);
4047                 kfree_skb(skb);
4048                 goto errout;
4049         }
4050         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4051         return;
4052 errout:
4053         if (err < 0)
4054                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4055 }
4056
4057 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4058                                 __s32 *array, int bytes)
4059 {
4060         BUG_ON(bytes < (DEVCONF_MAX * 4));
4061
4062         memset(array, 0, bytes);
4063         array[DEVCONF_FORWARDING] = cnf->forwarding;
4064         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4065         array[DEVCONF_MTU6] = cnf->mtu6;
4066         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4067         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4068         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4069         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4070         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4071         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4072                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4073         array[DEVCONF_RTR_SOLICIT_DELAY] =
4074                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4075         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4076         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4077                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4078         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4079                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4080         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4081         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4082         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4083         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4084         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4085         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4086         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4087         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4088 #ifdef CONFIG_IPV6_ROUTER_PREF
4089         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4090         array[DEVCONF_RTR_PROBE_INTERVAL] =
4091                 jiffies_to_msecs(cnf->rtr_probe_interval);
4092 #ifdef CONFIG_IPV6_ROUTE_INFO
4093         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4094 #endif
4095 #endif
4096         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4097         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4098 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4099         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4100 #endif
4101 #ifdef CONFIG_IPV6_MROUTE
4102         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4103 #endif
4104         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4105         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4106         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4107         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4108         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4109 }
4110
4111 static inline size_t inet6_ifla6_size(void)
4112 {
4113         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4114              + nla_total_size(sizeof(struct ifla_cacheinfo))
4115              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4116              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4117              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4118              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4119 }
4120
4121 static inline size_t inet6_if_nlmsg_size(void)
4122 {
4123         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4124                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4125                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4126                + nla_total_size(4) /* IFLA_MTU */
4127                + nla_total_size(4) /* IFLA_LINK */
4128                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4129 }
4130
4131 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4132                                       int items, int bytes)
4133 {
4134         int i;
4135         int pad = bytes - sizeof(u64) * items;
4136         BUG_ON(pad < 0);
4137
4138         /* Use put_unaligned() because stats may not be aligned for u64. */
4139         put_unaligned(items, &stats[0]);
4140         for (i = 1; i < items; i++)
4141                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4142
4143         memset(&stats[items], 0, pad);
4144 }
4145
4146 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4147                                       int items, int bytes, size_t syncpoff)
4148 {
4149         int i;
4150         int pad = bytes - sizeof(u64) * items;
4151         BUG_ON(pad < 0);
4152
4153         /* Use put_unaligned() because stats may not be aligned for u64. */
4154         put_unaligned(items, &stats[0]);
4155         for (i = 1; i < items; i++)
4156                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4157
4158         memset(&stats[items], 0, pad);
4159 }
4160
4161 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4162                              int bytes)
4163 {
4164         switch (attrtype) {
4165         case IFLA_INET6_STATS:
4166                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4167                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4168                 break;
4169         case IFLA_INET6_ICMP6STATS:
4170                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4171                 break;
4172         }
4173 }
4174
4175 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4176 {
4177         struct nlattr *nla;
4178         struct ifla_cacheinfo ci;
4179
4180         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4181                 goto nla_put_failure;
4182         ci.max_reasm_len = IPV6_MAXPLEN;
4183         ci.tstamp = cstamp_delta(idev->tstamp);
4184         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4185         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4186         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4187                 goto nla_put_failure;
4188         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4189         if (nla == NULL)
4190                 goto nla_put_failure;
4191         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4192
4193         /* XXX - MC not implemented */
4194
4195         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4196         if (nla == NULL)
4197                 goto nla_put_failure;
4198         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4199
4200         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4201         if (nla == NULL)
4202                 goto nla_put_failure;
4203         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4204
4205         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4206         if (nla == NULL)
4207                 goto nla_put_failure;
4208         read_lock_bh(&idev->lock);
4209         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4210         read_unlock_bh(&idev->lock);
4211
4212         return 0;
4213
4214 nla_put_failure:
4215         return -EMSGSIZE;
4216 }
4217
4218 static size_t inet6_get_link_af_size(const struct net_device *dev)
4219 {
4220         if (!__in6_dev_get(dev))
4221                 return 0;
4222
4223         return inet6_ifla6_size();
4224 }
4225
4226 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4227 {
4228         struct inet6_dev *idev = __in6_dev_get(dev);
4229
4230         if (!idev)
4231                 return -ENODATA;
4232
4233         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4234                 return -EMSGSIZE;
4235
4236         return 0;
4237 }
4238
4239 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4240 {
4241         struct inet6_ifaddr *ifp;
4242         struct net_device *dev = idev->dev;
4243         bool update_rs = false;
4244         struct in6_addr ll_addr;
4245
4246         if (token == NULL)
4247                 return -EINVAL;
4248         if (ipv6_addr_any(token))
4249                 return -EINVAL;
4250         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4251                 return -EINVAL;
4252         if (!ipv6_accept_ra(idev))
4253                 return -EINVAL;
4254         if (idev->cnf.rtr_solicits <= 0)
4255                 return -EINVAL;
4256
4257         write_lock_bh(&idev->lock);
4258
4259         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4260         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4261
4262         write_unlock_bh(&idev->lock);
4263
4264         if (!idev->dead && (idev->if_flags & IF_READY) &&
4265             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4266                              IFA_F_OPTIMISTIC)) {
4267
4268                 /* If we're not ready, then normal ifup will take care
4269                  * of this. Otherwise, we need to request our rs here.
4270                  */
4271                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4272                 update_rs = true;
4273         }
4274
4275         write_lock_bh(&idev->lock);
4276
4277         if (update_rs) {
4278                 idev->if_flags |= IF_RS_SENT;
4279                 idev->rs_probes = 1;
4280                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4281         }
4282
4283         /* Well, that's kinda nasty ... */
4284         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4285                 spin_lock(&ifp->lock);
4286                 if (ifp->tokenized) {
4287                         ifp->valid_lft = 0;
4288                         ifp->prefered_lft = 0;
4289                 }
4290                 spin_unlock(&ifp->lock);
4291         }
4292
4293         write_unlock_bh(&idev->lock);
4294         addrconf_verify(0);
4295         return 0;
4296 }
4297
4298 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4299 {
4300         int err = -EINVAL;
4301         struct inet6_dev *idev = __in6_dev_get(dev);
4302         struct nlattr *tb[IFLA_INET6_MAX + 1];
4303
4304         if (!idev)
4305                 return -EAFNOSUPPORT;
4306
4307         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4308                 BUG();
4309
4310         if (tb[IFLA_INET6_TOKEN])
4311                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4312
4313         return err;
4314 }
4315
4316 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4317                              u32 portid, u32 seq, int event, unsigned int flags)
4318 {
4319         struct net_device *dev = idev->dev;
4320         struct ifinfomsg *hdr;
4321         struct nlmsghdr *nlh;
4322         void *protoinfo;
4323
4324         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4325         if (nlh == NULL)
4326                 return -EMSGSIZE;
4327
4328         hdr = nlmsg_data(nlh);
4329         hdr->ifi_family = AF_INET6;
4330         hdr->__ifi_pad = 0;
4331         hdr->ifi_type = dev->type;
4332         hdr->ifi_index = dev->ifindex;
4333         hdr->ifi_flags = dev_get_flags(dev);
4334         hdr->ifi_change = 0;
4335
4336         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4337             (dev->addr_len &&
4338              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4339             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4340             (dev->ifindex != dev->iflink &&
4341              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4342                 goto nla_put_failure;
4343         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4344         if (protoinfo == NULL)
4345                 goto nla_put_failure;
4346
4347         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4348                 goto nla_put_failure;
4349
4350         nla_nest_end(skb, protoinfo);
4351         return nlmsg_end(skb, nlh);
4352
4353 nla_put_failure:
4354         nlmsg_cancel(skb, nlh);
4355         return -EMSGSIZE;
4356 }
4357
4358 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4359 {
4360         struct net *net = sock_net(skb->sk);
4361         int h, s_h;
4362         int idx = 0, s_idx;
4363         struct net_device *dev;
4364         struct inet6_dev *idev;
4365         struct hlist_head *head;
4366
4367         s_h = cb->args[0];
4368         s_idx = cb->args[1];
4369
4370         rcu_read_lock();
4371         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4372                 idx = 0;
4373                 head = &net->dev_index_head[h];
4374                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4375                         if (idx < s_idx)
4376                                 goto cont;
4377                         idev = __in6_dev_get(dev);
4378                         if (!idev)
4379                                 goto cont;
4380                         if (inet6_fill_ifinfo(skb, idev,
4381                                               NETLINK_CB(cb->skb).portid,
4382                                               cb->nlh->nlmsg_seq,
4383                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4384                                 goto out;
4385 cont:
4386                         idx++;
4387                 }
4388         }
4389 out:
4390         rcu_read_unlock();
4391         cb->args[1] = idx;
4392         cb->args[0] = h;
4393
4394         return skb->len;
4395 }
4396
4397 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4398 {
4399         struct sk_buff *skb;
4400         struct net *net = dev_net(idev->dev);
4401         int err = -ENOBUFS;
4402
4403         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4404         if (skb == NULL)
4405                 goto errout;
4406
4407         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4408         if (err < 0) {
4409                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4410                 WARN_ON(err == -EMSGSIZE);
4411                 kfree_skb(skb);
4412                 goto errout;
4413         }
4414         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4415         return;
4416 errout:
4417         if (err < 0)
4418                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4419 }
4420
4421 static inline size_t inet6_prefix_nlmsg_size(void)
4422 {
4423         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4424                + nla_total_size(sizeof(struct in6_addr))
4425                + nla_total_size(sizeof(struct prefix_cacheinfo));
4426 }
4427
4428 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4429                              struct prefix_info *pinfo, u32 portid, u32 seq,
4430                              int event, unsigned int flags)
4431 {
4432         struct prefixmsg *pmsg;
4433         struct nlmsghdr *nlh;
4434         struct prefix_cacheinfo ci;
4435
4436         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4437         if (nlh == NULL)
4438                 return -EMSGSIZE;
4439
4440         pmsg = nlmsg_data(nlh);
4441         pmsg->prefix_family = AF_INET6;
4442         pmsg->prefix_pad1 = 0;
4443         pmsg->prefix_pad2 = 0;
4444         pmsg->prefix_ifindex = idev->dev->ifindex;
4445         pmsg->prefix_len = pinfo->prefix_len;
4446         pmsg->prefix_type = pinfo->type;
4447         pmsg->prefix_pad3 = 0;
4448         pmsg->prefix_flags = 0;
4449         if (pinfo->onlink)
4450                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4451         if (pinfo->autoconf)
4452                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4453
4454         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4455                 goto nla_put_failure;
4456         ci.preferred_time = ntohl(pinfo->prefered);
4457         ci.valid_time = ntohl(pinfo->valid);
4458         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4459                 goto nla_put_failure;
4460         return nlmsg_end(skb, nlh);
4461
4462 nla_put_failure:
4463         nlmsg_cancel(skb, nlh);
4464         return -EMSGSIZE;
4465 }
4466
4467 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4468                          struct prefix_info *pinfo)
4469 {
4470         struct sk_buff *skb;
4471         struct net *net = dev_net(idev->dev);
4472         int err = -ENOBUFS;
4473
4474         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4475         if (skb == NULL)
4476                 goto errout;
4477
4478         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4479         if (err < 0) {
4480                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4481                 WARN_ON(err == -EMSGSIZE);
4482                 kfree_skb(skb);
4483                 goto errout;
4484         }
4485         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4486         return;
4487 errout:
4488         if (err < 0)
4489                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4490 }
4491
4492 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4493 {
4494         write_lock_bh(&ifp->idev->lock);
4495         spin_lock(&ifp->lock);
4496         if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4497                             IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4498             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4499                 ifp->idev->valid_ll_addr_cnt += count;
4500         WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4501         spin_unlock(&ifp->lock);
4502         write_unlock_bh(&ifp->idev->lock);
4503 }
4504
4505 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4506 {
4507         struct net *net = dev_net(ifp->idev->dev);
4508
4509         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4510
4511         switch (event) {
4512         case RTM_NEWADDR:
4513                 update_valid_ll_addr_cnt(ifp, 1);
4514
4515                 /*
4516                  * If the address was optimistic
4517                  * we inserted the route at the start of
4518                  * our DAD process, so we don't need
4519                  * to do it again
4520                  */
4521                 if (!(ifp->rt->rt6i_node))
4522                         ip6_ins_rt(ifp->rt);
4523                 if (ifp->idev->cnf.forwarding)
4524                         addrconf_join_anycast(ifp);
4525                 if (!ipv6_addr_any(&ifp->peer_addr))
4526                         addrconf_prefix_route(&ifp->peer_addr, 128,
4527                                               ifp->idev->dev, 0, 0);
4528                 break;
4529         case RTM_DELADDR:
4530                 update_valid_ll_addr_cnt(ifp, -1);
4531
4532                 if (ifp->idev->cnf.forwarding)
4533                         addrconf_leave_anycast(ifp);
4534                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4535                 if (!ipv6_addr_any(&ifp->peer_addr)) {
4536                         struct rt6_info *rt;
4537                         struct net_device *dev = ifp->idev->dev;
4538
4539                         rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4540                                         dev->ifindex, 1);
4541                         if (rt) {
4542                                 dst_hold(&rt->dst);
4543                                 if (ip6_del_rt(rt))
4544                                         dst_free(&rt->dst);
4545                         }
4546                 }
4547                 dst_hold(&ifp->rt->dst);
4548
4549                 if (ip6_del_rt(ifp->rt))
4550                         dst_free(&ifp->rt->dst);
4551                 break;
4552         }
4553         atomic_inc(&net->ipv6.dev_addr_genid);
4554         rt_genid_bump_ipv6(net);
4555 }
4556
4557 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4558 {
4559         rcu_read_lock_bh();
4560         if (likely(ifp->idev->dead == 0))
4561                 __ipv6_ifa_notify(event, ifp);
4562         rcu_read_unlock_bh();
4563 }
4564
4565 #ifdef CONFIG_SYSCTL
4566
4567 static
4568 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4569                            void __user *buffer, size_t *lenp, loff_t *ppos)
4570 {
4571         int *valp = ctl->data;
4572         int val = *valp;
4573         loff_t pos = *ppos;
4574         struct ctl_table lctl;
4575         int ret;
4576
4577         /*
4578          * ctl->data points to idev->cnf.forwarding, we should
4579          * not modify it until we get the rtnl lock.
4580          */
4581         lctl = *ctl;
4582         lctl.data = &val;
4583
4584         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4585
4586         if (write)
4587                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4588         if (ret)
4589                 *ppos = pos;
4590         return ret;
4591 }
4592
4593 static void dev_disable_change(struct inet6_dev *idev)
4594 {
4595         struct netdev_notifier_info info;
4596
4597         if (!idev || !idev->dev)
4598                 return;
4599
4600         netdev_notifier_info_init(&info, idev->dev);
4601         if (idev->cnf.disable_ipv6)
4602                 addrconf_notify(NULL, NETDEV_DOWN, &info);
4603         else
4604                 addrconf_notify(NULL, NETDEV_UP, &info);
4605 }
4606
4607 static void addrconf_disable_change(struct net *net, __s32 newf)
4608 {
4609         struct net_device *dev;
4610         struct inet6_dev *idev;
4611
4612         rcu_read_lock();
4613         for_each_netdev_rcu(net, dev) {
4614                 idev = __in6_dev_get(dev);
4615                 if (idev) {
4616                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4617                         idev->cnf.disable_ipv6 = newf;
4618                         if (changed)
4619                                 dev_disable_change(idev);
4620                 }
4621         }
4622         rcu_read_unlock();
4623 }
4624
4625 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4626 {
4627         struct net *net;
4628         int old;
4629
4630         if (!rtnl_trylock())
4631                 return restart_syscall();
4632
4633         net = (struct net *)table->extra2;
4634         old = *p;
4635         *p = newf;
4636
4637         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4638                 rtnl_unlock();
4639                 return 0;
4640         }
4641
4642         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4643                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4644                 addrconf_disable_change(net, newf);
4645         } else if ((!newf) ^ (!old))
4646                 dev_disable_change((struct inet6_dev *)table->extra1);
4647
4648         rtnl_unlock();
4649         return 0;
4650 }
4651
4652 static
4653 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4654                             void __user *buffer, size_t *lenp, loff_t *ppos)
4655 {
4656         int *valp = ctl->data;
4657         int val = *valp;
4658         loff_t pos = *ppos;
4659         struct ctl_table lctl;
4660         int ret;
4661
4662         /*
4663          * ctl->data points to idev->cnf.disable_ipv6, we should
4664          * not modify it until we get the rtnl lock.
4665          */
4666         lctl = *ctl;
4667         lctl.data = &val;
4668
4669         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4670
4671         if (write)
4672                 ret = addrconf_disable_ipv6(ctl, valp, val);
4673         if (ret)
4674                 *ppos = pos;
4675         return ret;
4676 }
4677
4678 static struct addrconf_sysctl_table
4679 {
4680         struct ctl_table_header *sysctl_header;
4681         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4682 } addrconf_sysctl __read_mostly = {
4683         .sysctl_header = NULL,
4684         .addrconf_vars = {
4685                 {
4686                         .procname       = "forwarding",
4687                         .data           = &ipv6_devconf.forwarding,
4688                         .maxlen         = sizeof(int),
4689                         .mode           = 0644,
4690                         .proc_handler   = addrconf_sysctl_forward,
4691                 },
4692                 {
4693                         .procname       = "hop_limit",
4694                         .data           = &ipv6_devconf.hop_limit,
4695                         .maxlen         = sizeof(int),
4696                         .mode           = 0644,
4697                         .proc_handler   = proc_dointvec,
4698                 },
4699                 {
4700                         .procname       = "mtu",
4701                         .data           = &ipv6_devconf.mtu6,
4702                         .maxlen         = sizeof(int),
4703                         .mode           = 0644,
4704                         .proc_handler   = proc_dointvec,
4705                 },
4706                 {
4707                         .procname       = "accept_ra",
4708                         .data           = &ipv6_devconf.accept_ra,
4709                         .maxlen         = sizeof(int),
4710                         .mode           = 0644,
4711                         .proc_handler   = proc_dointvec,
4712                 },
4713                 {
4714                         .procname       = "accept_redirects",
4715                         .data           = &ipv6_devconf.accept_redirects,
4716                         .maxlen         = sizeof(int),
4717                         .mode           = 0644,
4718                         .proc_handler   = proc_dointvec,
4719                 },
4720                 {
4721                         .procname       = "autoconf",
4722                         .data           = &ipv6_devconf.autoconf,
4723                         .maxlen         = sizeof(int),
4724                         .mode           = 0644,
4725                         .proc_handler   = proc_dointvec,
4726                 },
4727                 {
4728                         .procname       = "dad_transmits",
4729                         .data           = &ipv6_devconf.dad_transmits,
4730                         .maxlen         = sizeof(int),
4731                         .mode           = 0644,
4732                         .proc_handler   = proc_dointvec,
4733                 },
4734                 {
4735                         .procname       = "router_solicitations",
4736                         .data           = &ipv6_devconf.rtr_solicits,
4737                         .maxlen         = sizeof(int),
4738                         .mode           = 0644,
4739                         .proc_handler   = proc_dointvec,
4740                 },
4741                 {
4742                         .procname       = "router_solicitation_interval",
4743                         .data           = &ipv6_devconf.rtr_solicit_interval,
4744                         .maxlen         = sizeof(int),
4745                         .mode           = 0644,
4746                         .proc_handler   = proc_dointvec_jiffies,
4747                 },
4748                 {
4749                         .procname       = "router_solicitation_delay",
4750                         .data           = &ipv6_devconf.rtr_solicit_delay,
4751                         .maxlen         = sizeof(int),
4752                         .mode           = 0644,
4753                         .proc_handler   = proc_dointvec_jiffies,
4754                 },
4755                 {
4756                         .procname       = "force_mld_version",
4757                         .data           = &ipv6_devconf.force_mld_version,
4758                         .maxlen         = sizeof(int),
4759                         .mode           = 0644,
4760                         .proc_handler   = proc_dointvec,
4761                 },
4762                 {
4763                         .procname       = "mldv1_unsolicited_report_interval",
4764                         .data           =
4765                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
4766                         .maxlen         = sizeof(int),
4767                         .mode           = 0644,
4768                         .proc_handler   = proc_dointvec_ms_jiffies,
4769                 },
4770                 {
4771                         .procname       = "mldv2_unsolicited_report_interval",
4772                         .data           =
4773                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
4774                         .maxlen         = sizeof(int),
4775                         .mode           = 0644,
4776                         .proc_handler   = proc_dointvec_ms_jiffies,
4777                 },
4778                 {
4779                         .procname       = "use_tempaddr",
4780                         .data           = &ipv6_devconf.use_tempaddr,
4781                         .maxlen         = sizeof(int),
4782                         .mode           = 0644,
4783                         .proc_handler   = proc_dointvec,
4784                 },
4785                 {
4786                         .procname       = "temp_valid_lft",
4787                         .data           = &ipv6_devconf.temp_valid_lft,
4788                         .maxlen         = sizeof(int),
4789                         .mode           = 0644,
4790                         .proc_handler   = proc_dointvec,
4791                 },
4792                 {
4793                         .procname       = "temp_prefered_lft",
4794                         .data           = &ipv6_devconf.temp_prefered_lft,
4795                         .maxlen         = sizeof(int),
4796                         .mode           = 0644,
4797                         .proc_handler   = proc_dointvec,
4798                 },
4799                 {
4800                         .procname       = "regen_max_retry",
4801                         .data           = &ipv6_devconf.regen_max_retry,
4802                         .maxlen         = sizeof(int),
4803                         .mode           = 0644,
4804                         .proc_handler   = proc_dointvec,
4805                 },
4806                 {
4807                         .procname       = "max_desync_factor",
4808                         .data           = &ipv6_devconf.max_desync_factor,
4809                         .maxlen         = sizeof(int),
4810                         .mode           = 0644,
4811                         .proc_handler   = proc_dointvec,
4812                 },
4813                 {
4814                         .procname       = "max_addresses",
4815                         .data           = &ipv6_devconf.max_addresses,
4816                         .maxlen         = sizeof(int),
4817                         .mode           = 0644,
4818                         .proc_handler   = proc_dointvec,
4819                 },
4820                 {
4821                         .procname       = "accept_ra_defrtr",
4822                         .data           = &ipv6_devconf.accept_ra_defrtr,
4823                         .maxlen         = sizeof(int),
4824                         .mode           = 0644,
4825                         .proc_handler   = proc_dointvec,
4826                 },
4827                 {
4828                         .procname       = "accept_ra_pinfo",
4829                         .data           = &ipv6_devconf.accept_ra_pinfo,
4830                         .maxlen         = sizeof(int),
4831                         .mode           = 0644,
4832                         .proc_handler   = proc_dointvec,
4833                 },
4834 #ifdef CONFIG_IPV6_ROUTER_PREF
4835                 {
4836                         .procname       = "accept_ra_rtr_pref",
4837                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4838                         .maxlen         = sizeof(int),
4839                         .mode           = 0644,
4840                         .proc_handler   = proc_dointvec,
4841                 },
4842                 {
4843                         .procname       = "router_probe_interval",
4844                         .data           = &ipv6_devconf.rtr_probe_interval,
4845                         .maxlen         = sizeof(int),
4846                         .mode           = 0644,
4847                         .proc_handler   = proc_dointvec_jiffies,
4848                 },
4849 #ifdef CONFIG_IPV6_ROUTE_INFO
4850                 {
4851                         .procname       = "accept_ra_rt_info_max_plen",
4852                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4853                         .maxlen         = sizeof(int),
4854                         .mode           = 0644,
4855                         .proc_handler   = proc_dointvec,
4856                 },
4857 #endif
4858 #endif
4859                 {
4860                         .procname       = "proxy_ndp",
4861                         .data           = &ipv6_devconf.proxy_ndp,
4862                         .maxlen         = sizeof(int),
4863                         .mode           = 0644,
4864                         .proc_handler   = proc_dointvec,
4865                 },
4866                 {
4867                         .procname       = "accept_source_route",
4868                         .data           = &ipv6_devconf.accept_source_route,
4869                         .maxlen         = sizeof(int),
4870                         .mode           = 0644,
4871                         .proc_handler   = proc_dointvec,
4872                 },
4873 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4874                 {
4875                         .procname       = "optimistic_dad",
4876                         .data           = &ipv6_devconf.optimistic_dad,
4877                         .maxlen         = sizeof(int),
4878                         .mode           = 0644,
4879                         .proc_handler   = proc_dointvec,
4880
4881                 },
4882 #endif
4883 #ifdef CONFIG_IPV6_MROUTE
4884                 {
4885                         .procname       = "mc_forwarding",
4886                         .data           = &ipv6_devconf.mc_forwarding,
4887                         .maxlen         = sizeof(int),
4888                         .mode           = 0444,
4889                         .proc_handler   = proc_dointvec,
4890                 },
4891 #endif
4892                 {
4893                         .procname       = "disable_ipv6",
4894                         .data           = &ipv6_devconf.disable_ipv6,
4895                         .maxlen         = sizeof(int),
4896                         .mode           = 0644,
4897                         .proc_handler   = addrconf_sysctl_disable,
4898                 },
4899                 {
4900                         .procname       = "accept_dad",
4901                         .data           = &ipv6_devconf.accept_dad,
4902                         .maxlen         = sizeof(int),
4903                         .mode           = 0644,
4904                         .proc_handler   = proc_dointvec,
4905                 },
4906                 {
4907                         .procname       = "force_tllao",
4908                         .data           = &ipv6_devconf.force_tllao,
4909                         .maxlen         = sizeof(int),
4910                         .mode           = 0644,
4911                         .proc_handler   = proc_dointvec
4912                 },
4913                 {
4914                         .procname       = "ndisc_notify",
4915                         .data           = &ipv6_devconf.ndisc_notify,
4916                         .maxlen         = sizeof(int),
4917                         .mode           = 0644,
4918                         .proc_handler   = proc_dointvec
4919                 },
4920                 {
4921                         .procname       = "suppress_frag_ndisc",
4922                         .data           = &ipv6_devconf.suppress_frag_ndisc,
4923                         .maxlen         = sizeof(int),
4924                         .mode           = 0644,
4925                         .proc_handler   = proc_dointvec
4926                 },
4927                 {
4928                         /* sentinel */
4929                 }
4930         },
4931 };
4932
4933 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4934                 struct inet6_dev *idev, struct ipv6_devconf *p)
4935 {
4936         int i;
4937         struct addrconf_sysctl_table *t;
4938         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4939
4940         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4941         if (t == NULL)
4942                 goto out;
4943
4944         for (i = 0; t->addrconf_vars[i].data; i++) {
4945                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4946                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4947                 t->addrconf_vars[i].extra2 = net;
4948         }
4949
4950         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4951
4952         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4953         if (t->sysctl_header == NULL)
4954                 goto free;
4955
4956         p->sysctl = t;
4957         return 0;
4958
4959 free:
4960         kfree(t);
4961 out:
4962         return -ENOBUFS;
4963 }
4964
4965 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4966 {
4967         struct addrconf_sysctl_table *t;
4968
4969         if (p->sysctl == NULL)
4970                 return;
4971
4972         t = p->sysctl;
4973         p->sysctl = NULL;
4974         unregister_net_sysctl_table(t->sysctl_header);
4975         kfree(t);
4976 }
4977
4978 static void addrconf_sysctl_register(struct inet6_dev *idev)
4979 {
4980         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4981                               &ndisc_ifinfo_sysctl_change);
4982         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4983                                         idev, &idev->cnf);
4984 }
4985
4986 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4987 {
4988         __addrconf_sysctl_unregister(&idev->cnf);
4989         neigh_sysctl_unregister(idev->nd_parms);
4990 }
4991
4992
4993 #endif
4994
4995 static int __net_init addrconf_init_net(struct net *net)
4996 {
4997         int err = -ENOMEM;
4998         struct ipv6_devconf *all, *dflt;
4999
5000         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5001         if (all == NULL)
5002                 goto err_alloc_all;
5003
5004         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5005         if (dflt == NULL)
5006                 goto err_alloc_dflt;
5007
5008         /* these will be inherited by all namespaces */
5009         dflt->autoconf = ipv6_defaults.autoconf;
5010         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5011
5012         net->ipv6.devconf_all = all;
5013         net->ipv6.devconf_dflt = dflt;
5014
5015 #ifdef CONFIG_SYSCTL
5016         err = __addrconf_sysctl_register(net, "all", NULL, all);
5017         if (err < 0)
5018                 goto err_reg_all;
5019
5020         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5021         if (err < 0)
5022                 goto err_reg_dflt;
5023 #endif
5024         return 0;
5025
5026 #ifdef CONFIG_SYSCTL
5027 err_reg_dflt:
5028         __addrconf_sysctl_unregister(all);
5029 err_reg_all:
5030         kfree(dflt);
5031 #endif
5032 err_alloc_dflt:
5033         kfree(all);
5034 err_alloc_all:
5035         return err;
5036 }
5037
5038 static void __net_exit addrconf_exit_net(struct net *net)
5039 {
5040 #ifdef CONFIG_SYSCTL
5041         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5042         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5043 #endif
5044         if (!net_eq(net, &init_net)) {
5045                 kfree(net->ipv6.devconf_dflt);
5046                 kfree(net->ipv6.devconf_all);
5047         }
5048 }
5049
5050 static struct pernet_operations addrconf_ops = {
5051         .init = addrconf_init_net,
5052         .exit = addrconf_exit_net,
5053 };
5054
5055 static struct rtnl_af_ops inet6_ops = {
5056         .family           = AF_INET6,
5057         .fill_link_af     = inet6_fill_link_af,
5058         .get_link_af_size = inet6_get_link_af_size,
5059         .set_link_af      = inet6_set_link_af,
5060 };
5061
5062 /*
5063  *      Init / cleanup code
5064  */
5065
5066 int __init addrconf_init(void)
5067 {
5068         int i, err;
5069
5070         err = ipv6_addr_label_init();
5071         if (err < 0) {
5072                 pr_crit("%s: cannot initialize default policy table: %d\n",
5073                         __func__, err);
5074                 goto out;
5075         }
5076
5077         err = register_pernet_subsys(&addrconf_ops);
5078         if (err < 0)
5079                 goto out_addrlabel;
5080
5081         /* The addrconf netdev notifier requires that loopback_dev
5082          * has it's ipv6 private information allocated and setup
5083          * before it can bring up and give link-local addresses
5084          * to other devices which are up.
5085          *
5086          * Unfortunately, loopback_dev is not necessarily the first
5087          * entry in the global dev_base list of net devices.  In fact,
5088          * it is likely to be the very last entry on that list.
5089          * So this causes the notifier registry below to try and
5090          * give link-local addresses to all devices besides loopback_dev
5091          * first, then loopback_dev, which cases all the non-loopback_dev
5092          * devices to fail to get a link-local address.
5093          *
5094          * So, as a temporary fix, allocate the ipv6 structure for
5095          * loopback_dev first by hand.
5096          * Longer term, all of the dependencies ipv6 has upon the loopback
5097          * device and it being up should be removed.
5098          */
5099         rtnl_lock();
5100         if (!ipv6_add_dev(init_net.loopback_dev))
5101                 err = -ENOMEM;
5102         rtnl_unlock();
5103         if (err)
5104                 goto errlo;
5105
5106         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5107                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5108
5109         register_netdevice_notifier(&ipv6_dev_notf);
5110
5111         addrconf_verify(0);
5112
5113         err = rtnl_af_register(&inet6_ops);
5114         if (err < 0)
5115                 goto errout_af;
5116
5117         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5118                               NULL);
5119         if (err < 0)
5120                 goto errout;
5121
5122         /* Only the first call to __rtnl_register can fail */
5123         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5124         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5125         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5126                         inet6_dump_ifaddr, NULL);
5127         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5128                         inet6_dump_ifmcaddr, NULL);
5129         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5130                         inet6_dump_ifacaddr, NULL);
5131         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5132                         inet6_netconf_dump_devconf, NULL);
5133
5134         ipv6_addr_label_rtnl_register();
5135
5136         return 0;
5137 errout:
5138         rtnl_af_unregister(&inet6_ops);
5139 errout_af:
5140         unregister_netdevice_notifier(&ipv6_dev_notf);
5141 errlo:
5142         unregister_pernet_subsys(&addrconf_ops);
5143 out_addrlabel:
5144         ipv6_addr_label_cleanup();
5145 out:
5146         return err;
5147 }
5148
5149 void addrconf_cleanup(void)
5150 {
5151         struct net_device *dev;
5152         int i;
5153
5154         unregister_netdevice_notifier(&ipv6_dev_notf);
5155         unregister_pernet_subsys(&addrconf_ops);
5156         ipv6_addr_label_cleanup();
5157
5158         rtnl_lock();
5159
5160         __rtnl_af_unregister(&inet6_ops);
5161
5162         /* clean dev list */
5163         for_each_netdev(&init_net, dev) {
5164                 if (__in6_dev_get(dev) == NULL)
5165                         continue;
5166                 addrconf_ifdown(dev, 1);
5167         }
5168         addrconf_ifdown(init_net.loopback_dev, 2);
5169
5170         /*
5171          *      Check hash table.
5172          */
5173         spin_lock_bh(&addrconf_hash_lock);
5174         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5175                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5176         spin_unlock_bh(&addrconf_hash_lock);
5177
5178         del_timer(&addr_chk_timer);
5179         rtnl_unlock();
5180 }