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 int addrconf_sysctl_register(struct inet6_dev *idev);
 112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 113 #else
 114 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 115 {
 116         return 0;
 117 }
 118
 119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 120 {
 121 }
 122 #endif
 123
 124 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 125 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 126 static void ipv6_regen_rndid(unsigned long data);
 127
 128 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 129 static int ipv6_count_addresses(struct inet6_dev *idev);
 130
 131 /*
 132  *      Configured unicast address hash table
 133  */
 134 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 135 static DEFINE_SPINLOCK(addrconf_hash_lock);
 136
 137 static void addrconf_verify(void);
 138 static void addrconf_verify_rtnl(void);
 139 static void addrconf_verify_work(struct work_struct *);
 140
 141 static struct workqueue_struct *addrconf_wq;
 142 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 143
 144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 146
 147 static void addrconf_type_change(struct net_device *dev,
 148                                  unsigned long event);
 149 static int addrconf_ifdown(struct net_device *dev, int how);
 150
 151 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 152                                                   int plen,
 153                                                   const struct net_device *dev,
 154                                                   u32 flags, u32 noflags);
 155
 156 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 157 static void addrconf_dad_work(struct work_struct *w);
 158 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 159 static void addrconf_dad_run(struct inet6_dev *idev);
 160 static void addrconf_rs_timer(unsigned long data);
 161 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 162 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 163
 164 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 165                                 struct prefix_info *pinfo);
 166 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 167                                struct net_device *dev);
 168
 169 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 170         .forwarding             = 0,
 171         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 172         .mtu6                   = IPV6_MIN_MTU,
 173         .accept_ra              = 1,
 174         .accept_redirects       = 1,
 175         .autoconf               = 1,
 176         .force_mld_version      = 0,
 177         .mldv1_unsolicited_report_interval = 10 * HZ,
 178         .mldv2_unsolicited_report_interval = HZ,
 179         .dad_transmits          = 1,
 180         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 181         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 182         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 183         .use_tempaddr           = 0,
 184         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 185         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 186         .regen_max_retry        = REGEN_MAX_RETRY,
 187         .max_desync_factor      = MAX_DESYNC_FACTOR,
 188         .max_addresses          = IPV6_MAX_ADDRESSES,
 189         .accept_ra_defrtr       = 1,
 190         .accept_ra_from_local   = 0,
 191         .accept_ra_pinfo        = 1,
 192 #ifdef CONFIG_IPV6_ROUTER_PREF
 193         .accept_ra_rtr_pref     = 1,
 194         .rtr_probe_interval     = 60 * HZ,
 195 #ifdef CONFIG_IPV6_ROUTE_INFO
 196         .accept_ra_rt_info_max_plen = 0,
 197 #endif
 198 #endif
 199         .proxy_ndp              = 0,
 200         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 201         .disable_ipv6           = 0,
 202         .accept_dad             = 1,
 203         .suppress_frag_ndisc    = 1,
 204 };
 205
 206 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 207         .forwarding             = 0,
 208         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 209         .mtu6                   = IPV6_MIN_MTU,
 210         .accept_ra              = 1,
 211         .accept_redirects       = 1,
 212         .autoconf               = 1,
 213         .force_mld_version      = 0,
 214         .mldv1_unsolicited_report_interval = 10 * HZ,
 215         .mldv2_unsolicited_report_interval = HZ,
 216         .dad_transmits          = 1,
 217         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 218         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 219         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 220         .use_tempaddr           = 0,
 221         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 222         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 223         .regen_max_retry        = REGEN_MAX_RETRY,
 224         .max_desync_factor      = MAX_DESYNC_FACTOR,
 225         .max_addresses          = IPV6_MAX_ADDRESSES,
 226         .accept_ra_defrtr       = 1,
 227         .accept_ra_from_local   = 0,
 228         .accept_ra_pinfo        = 1,
 229 #ifdef CONFIG_IPV6_ROUTER_PREF
 230         .accept_ra_rtr_pref     = 1,
 231         .rtr_probe_interval     = 60 * HZ,
 232 #ifdef CONFIG_IPV6_ROUTE_INFO
 233         .accept_ra_rt_info_max_plen = 0,
 234 #endif
 235 #endif
 236         .proxy_ndp              = 0,
 237         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 238         .disable_ipv6           = 0,
 239         .accept_dad             = 1,
 240         .suppress_frag_ndisc    = 1,
 241 };
 242
 243 /* Check if a valid qdisc is available */
 244 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 245 {
 246         return !qdisc_tx_is_noop(dev);
 247 }
 248
 249 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 250 {
 251         if (del_timer(&idev->rs_timer))
 252                 __in6_dev_put(idev);
 253 }
 254
 255 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 256 {
 257         if (cancel_delayed_work(&ifp->dad_work))
 258                 __in6_ifa_put(ifp);
 259 }
 260
 261 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 262                                   unsigned long when)
 263 {
 264         if (!timer_pending(&idev->rs_timer))
 265                 in6_dev_hold(idev);
 266         mod_timer(&idev->rs_timer, jiffies + when);
 267 }
 268
 269 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 270                                    unsigned long delay)
 271 {
 272         if (!delayed_work_pending(&ifp->dad_work))
 273                 in6_ifa_hold(ifp);
 274         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 275 }
 276
 277 static int snmp6_alloc_dev(struct inet6_dev *idev)
 278 {
 279         int i;
 280
 281         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 282         if (!idev->stats.ipv6)
 283                 goto err_ip;
 284
 285         for_each_possible_cpu(i) {
 286                 struct ipstats_mib *addrconf_stats;
 287                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 288                 u64_stats_init(&addrconf_stats->syncp);
 289         }
 290
 291
 292         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 293                                         GFP_KERNEL);
 294         if (!idev->stats.icmpv6dev)
 295                 goto err_icmp;
 296         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 297                                            GFP_KERNEL);
 298         if (!idev->stats.icmpv6msgdev)
 299                 goto err_icmpmsg;
 300
 301         return 0;
 302
 303 err_icmpmsg:
 304         kfree(idev->stats.icmpv6dev);
 305 err_icmp:
 306         free_percpu(idev->stats.ipv6);
 307 err_ip:
 308         return -ENOMEM;
 309 }
 310
 311 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 312 {
 313         struct inet6_dev *ndev;
 314         int err = -ENOMEM;
 315
 316         ASSERT_RTNL();
 317
 318         if (dev->mtu < IPV6_MIN_MTU)
 319                 return ERR_PTR(-EINVAL);
 320
 321         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 322         if (ndev == NULL)
 323                 return ERR_PTR(err);
 324
 325         rwlock_init(&ndev->lock);
 326         ndev->dev = dev;
 327         INIT_LIST_HEAD(&ndev->addr_list);
 328         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 329                     (unsigned long)ndev);
 330         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 331         ndev->cnf.mtu6 = dev->mtu;
 332         ndev->cnf.sysctl = NULL;
 333         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 334         if (ndev->nd_parms == NULL) {
 335                 kfree(ndev);
 336                 return ERR_PTR(err);
 337         }
 338         if (ndev->cnf.forwarding)
 339                 dev_disable_lro(dev);
 340         /* We refer to the device */
 341         dev_hold(dev);
 342
 343         if (snmp6_alloc_dev(ndev) < 0) {
 344                 ADBG(KERN_WARNING
 345                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 346                         __func__, dev->name);
 347                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 348                 dev_put(dev);
 349                 kfree(ndev);
 350                 return ERR_PTR(err);
 351         }
 352
 353         if (snmp6_register_dev(ndev) < 0) {
 354                 ADBG(KERN_WARNING
 355                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 356                         __func__, dev->name);
 357                 goto err_release;
 358         }
 359
 360         /* One reference from device.  We must do this before
 361          * we invoke __ipv6_regen_rndid().
 362          */
 363         in6_dev_hold(ndev);
 364
 365         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 366                 ndev->cnf.accept_dad = -1;
 367
 368 #if IS_ENABLED(CONFIG_IPV6_SIT)
 369         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 370                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 371                 ndev->cnf.rtr_solicits = 0;
 372         }
 373 #endif
 374
 375         INIT_LIST_HEAD(&ndev->tempaddr_list);
 376         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 377         if ((dev->flags&IFF_LOOPBACK) ||
 378             dev->type == ARPHRD_TUNNEL ||
 379             dev->type == ARPHRD_TUNNEL6 ||
 380             dev->type == ARPHRD_SIT ||
 381             dev->type == ARPHRD_NONE) {
 382                 ndev->cnf.use_tempaddr = -1;
 383         } else {
 384                 in6_dev_hold(ndev);
 385                 ipv6_regen_rndid((unsigned long) ndev);
 386         }
 387
 388         ndev->token = in6addr_any;
 389
 390         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 391                 ndev->if_flags |= IF_READY;
 392
 393         ipv6_mc_init_dev(ndev);
 394         ndev->tstamp = jiffies;
 395         err = addrconf_sysctl_register(ndev);
 396         if (err) {
 397                 ipv6_mc_destroy_dev(ndev);
 398                 del_timer(&ndev->regen_timer);
 399                 goto err_release;
 400         }
 401         /* protected by rtnl_lock */
 402         rcu_assign_pointer(dev->ip6_ptr, ndev);
 403
 404         /* Join interface-local all-node multicast group */
 405         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 406
 407         /* Join all-node multicast group */
 408         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 409
 410         /* Join all-router multicast group if forwarding is set */
 411         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 412                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 413
 414         return ndev;
 415
 416 err_release:
 417         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 418         ndev->dead = 1;
 419         in6_dev_finish_destroy(ndev);
 420         return ERR_PTR(err);
 421 }
 422
 423 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 424 {
 425         struct inet6_dev *idev;
 426
 427         ASSERT_RTNL();
 428
 429         idev = __in6_dev_get(dev);
 430         if (!idev) {
 431                 idev = ipv6_add_dev(dev);
 432                 if (IS_ERR(idev))
 433                         return NULL;
 434         }
 435
 436         if (dev->flags&IFF_UP)
 437                 ipv6_mc_up(idev);
 438         return idev;
 439 }
 440
 441 static int inet6_netconf_msgsize_devconf(int type)
 442 {
 443         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 444                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 445
 446         /* type -1 is used for ALL */
 447         if (type == -1 || type == NETCONFA_FORWARDING)
 448                 size += nla_total_size(4);
 449 #ifdef CONFIG_IPV6_MROUTE
 450         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 451                 size += nla_total_size(4);
 452 #endif
 453         if (type == -1 || type == NETCONFA_PROXY_NEIGH)
 454                 size += nla_total_size(4);
 455
 456         return size;
 457 }
 458
 459 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 460                                       struct ipv6_devconf *devconf, u32 portid,
 461                                       u32 seq, int event, unsigned int flags,
 462                                       int type)
 463 {
 464         struct nlmsghdr  *nlh;
 465         struct netconfmsg *ncm;
 466
 467         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 468                         flags);
 469         if (nlh == NULL)
 470                 return -EMSGSIZE;
 471
 472         ncm = nlmsg_data(nlh);
 473         ncm->ncm_family = AF_INET6;
 474
 475         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 476                 goto nla_put_failure;
 477
 478         /* type -1 is used for ALL */
 479         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 480             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 481                 goto nla_put_failure;
 482 #ifdef CONFIG_IPV6_MROUTE
 483         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 484             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 485                         devconf->mc_forwarding) < 0)
 486                 goto nla_put_failure;
 487 #endif
 488         if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
 489             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 490                 goto nla_put_failure;
 491
 492         return nlmsg_end(skb, nlh);
 493
 494 nla_put_failure:
 495         nlmsg_cancel(skb, nlh);
 496         return -EMSGSIZE;
 497 }
 498
 499 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 500                                   struct ipv6_devconf *devconf)
 501 {
 502         struct sk_buff *skb;
 503         int err = -ENOBUFS;
 504
 505         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 506         if (skb == NULL)
 507                 goto errout;
 508
 509         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 510                                          RTM_NEWNETCONF, 0, type);
 511         if (err < 0) {
 512                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 513                 WARN_ON(err == -EMSGSIZE);
 514                 kfree_skb(skb);
 515                 goto errout;
 516         }
 517         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 518         return;
 519 errout:
 520         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 521 }
 522
 523 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 524         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 525         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 526         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 527 };
 528
 529 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 530                                      struct nlmsghdr *nlh)
 531 {
 532         struct net *net = sock_net(in_skb->sk);
 533         struct nlattr *tb[NETCONFA_MAX+1];
 534         struct netconfmsg *ncm;
 535         struct sk_buff *skb;
 536         struct ipv6_devconf *devconf;
 537         struct inet6_dev *in6_dev;
 538         struct net_device *dev;
 539         int ifindex;
 540         int err;
 541
 542         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 543                           devconf_ipv6_policy);
 544         if (err < 0)
 545                 goto errout;
 546
 547         err = EINVAL;
 548         if (!tb[NETCONFA_IFINDEX])
 549                 goto errout;
 550
 551         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 552         switch (ifindex) {
 553         case NETCONFA_IFINDEX_ALL:
 554                 devconf = net->ipv6.devconf_all;
 555                 break;
 556         case NETCONFA_IFINDEX_DEFAULT:
 557                 devconf = net->ipv6.devconf_dflt;
 558                 break;
 559         default:
 560                 dev = __dev_get_by_index(net, ifindex);
 561                 if (dev == NULL)
 562                         goto errout;
 563                 in6_dev = __in6_dev_get(dev);
 564                 if (in6_dev == NULL)
 565                         goto errout;
 566                 devconf = &in6_dev->cnf;
 567                 break;
 568         }
 569
 570         err = -ENOBUFS;
 571         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 572         if (skb == NULL)
 573                 goto errout;
 574
 575         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 576                                          NETLINK_CB(in_skb).portid,
 577                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 578                                          -1);
 579         if (err < 0) {
 580                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 581                 WARN_ON(err == -EMSGSIZE);
 582                 kfree_skb(skb);
 583                 goto errout;
 584         }
 585         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 586 errout:
 587         return err;
 588 }
 589
 590 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 591                                       struct netlink_callback *cb)
 592 {
 593         struct net *net = sock_net(skb->sk);
 594         int h, s_h;
 595         int idx, s_idx;
 596         struct net_device *dev;
 597         struct inet6_dev *idev;
 598         struct hlist_head *head;
 599
 600         s_h = cb->args[0];
 601         s_idx = idx = cb->args[1];
 602
 603         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 604                 idx = 0;
 605                 head = &net->dev_index_head[h];
 606                 rcu_read_lock();
 607                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 608                           net->dev_base_seq;
 609                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 610                         if (idx < s_idx)
 611                                 goto cont;
 612                         idev = __in6_dev_get(dev);
 613                         if (!idev)
 614                                 goto cont;
 615
 616                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 617                                                        &idev->cnf,
 618                                                        NETLINK_CB(cb->skb).portid,
 619                                                        cb->nlh->nlmsg_seq,
 620                                                        RTM_NEWNETCONF,
 621                                                        NLM_F_MULTI,
 622                                                        -1) <= 0) {
 623                                 rcu_read_unlock();
 624                                 goto done;
 625                         }
 626                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 627 cont:
 628                         idx++;
 629                 }
 630                 rcu_read_unlock();
 631         }
 632         if (h == NETDEV_HASHENTRIES) {
 633                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 634                                                net->ipv6.devconf_all,
 635                                                NETLINK_CB(cb->skb).portid,
 636                                                cb->nlh->nlmsg_seq,
 637                                                RTM_NEWNETCONF, NLM_F_MULTI,
 638                                                -1) <= 0)
 639                         goto done;
 640                 else
 641                         h++;
 642         }
 643         if (h == NETDEV_HASHENTRIES + 1) {
 644                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 645                                                net->ipv6.devconf_dflt,
 646                                                NETLINK_CB(cb->skb).portid,
 647                                                cb->nlh->nlmsg_seq,
 648                                                RTM_NEWNETCONF, NLM_F_MULTI,
 649                                                -1) <= 0)
 650                         goto done;
 651                 else
 652                         h++;
 653         }
 654 done:
 655         cb->args[0] = h;
 656         cb->args[1] = idx;
 657
 658         return skb->len;
 659 }
 660
 661 #ifdef CONFIG_SYSCTL
 662 static void dev_forward_change(struct inet6_dev *idev)
 663 {
 664         struct net_device *dev;
 665         struct inet6_ifaddr *ifa;
 666
 667         if (!idev)
 668                 return;
 669         dev = idev->dev;
 670         if (idev->cnf.forwarding)
 671                 dev_disable_lro(dev);
 672         if (dev->flags & IFF_MULTICAST) {
 673                 if (idev->cnf.forwarding) {
 674                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 675                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 676                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 677                 } else {
 678                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 679                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 680                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 681                 }
 682         }
 683
 684         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 685                 if (ifa->flags&IFA_F_TENTATIVE)
 686                         continue;
 687                 if (idev->cnf.forwarding)
 688                         addrconf_join_anycast(ifa);
 689                 else
 690                         addrconf_leave_anycast(ifa);
 691         }
 692         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 693                                      dev->ifindex, &idev->cnf);
 694 }
 695
 696
 697 static void addrconf_forward_change(struct net *net, __s32 newf)
 698 {
 699         struct net_device *dev;
 700         struct inet6_dev *idev;
 701
 702         for_each_netdev(net, dev) {
 703                 idev = __in6_dev_get(dev);
 704                 if (idev) {
 705                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 706                         idev->cnf.forwarding = newf;
 707                         if (changed)
 708                                 dev_forward_change(idev);
 709                 }
 710         }
 711 }
 712
 713 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 714 {
 715         struct net *net;
 716         int old;
 717
 718         if (!rtnl_trylock())
 719                 return restart_syscall();
 720
 721         net = (struct net *)table->extra2;
 722         old = *p;
 723         *p = newf;
 724
 725         if (p == &net->ipv6.devconf_dflt->forwarding) {
 726                 if ((!newf) ^ (!old))
 727                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 728                                                      NETCONFA_IFINDEX_DEFAULT,
 729                                                      net->ipv6.devconf_dflt);
 730                 rtnl_unlock();
 731                 return 0;
 732         }
 733
 734         if (p == &net->ipv6.devconf_all->forwarding) {
 735                 net->ipv6.devconf_dflt->forwarding = newf;
 736                 addrconf_forward_change(net, newf);
 737                 if ((!newf) ^ (!old))
 738                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 739                                                      NETCONFA_IFINDEX_ALL,
 740                                                      net->ipv6.devconf_all);
 741         } else if ((!newf) ^ (!old))
 742                 dev_forward_change((struct inet6_dev *)table->extra1);
 743         rtnl_unlock();
 744
 745         if (newf)
 746                 rt6_purge_dflt_routers(net);
 747         return 1;
 748 }
 749 #endif
 750
 751 /* Nobody refers to this ifaddr, destroy it */
 752 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 753 {
 754         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 755
 756 #ifdef NET_REFCNT_DEBUG
 757         pr_debug("%s\n", __func__);
 758 #endif
 759
 760         in6_dev_put(ifp->idev);
 761
 762         if (cancel_delayed_work(&ifp->dad_work))
 763                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 764                           ifp);
 765
 766         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 767                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 768                 return;
 769         }
 770         ip6_rt_put(ifp->rt);
 771
 772         kfree_rcu(ifp, rcu);
 773 }
 774
 775 static void
 776 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 777 {
 778         struct list_head *p;
 779         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 780
 781         /*
 782          * Each device address list is sorted in order of scope -
 783          * global before linklocal.
 784          */
 785         list_for_each(p, &idev->addr_list) {
 786                 struct inet6_ifaddr *ifa
 787                         = list_entry(p, struct inet6_ifaddr, if_list);
 788                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 789                         break;
 790         }
 791
 792         list_add_tail(&ifp->if_list, p);
 793 }
 794
 795 static u32 inet6_addr_hash(const struct in6_addr *addr)
 796 {
 797         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 798 }
 799
 800 /* On success it returns ifp with increased reference count */
 801
 802 static struct inet6_ifaddr *
 803 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 804               const struct in6_addr *peer_addr, int pfxlen,
 805               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 806 {
 807         struct inet6_ifaddr *ifa = NULL;
 808         struct rt6_info *rt;
 809         unsigned int hash;
 810         int err = 0;
 811         int addr_type = ipv6_addr_type(addr);
 812
 813         if (addr_type == IPV6_ADDR_ANY ||
 814             addr_type & IPV6_ADDR_MULTICAST ||
 815             (!(idev->dev->flags & IFF_LOOPBACK) &&
 816              addr_type & IPV6_ADDR_LOOPBACK))
 817                 return ERR_PTR(-EADDRNOTAVAIL);
 818
 819         rcu_read_lock_bh();
 820         if (idev->dead) {
 821                 err = -ENODEV;                  /*XXX*/
 822                 goto out2;
 823         }
 824
 825         if (idev->cnf.disable_ipv6) {
 826                 err = -EACCES;
 827                 goto out2;
 828         }
 829
 830         spin_lock(&addrconf_hash_lock);
 831
 832         /* Ignore adding duplicate addresses on an interface */
 833         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 834                 ADBG("ipv6_add_addr: already assigned\n");
 835                 err = -EEXIST;
 836                 goto out;
 837         }
 838
 839         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 840
 841         if (ifa == NULL) {
 842                 ADBG("ipv6_add_addr: malloc failed\n");
 843                 err = -ENOBUFS;
 844                 goto out;
 845         }
 846
 847         rt = addrconf_dst_alloc(idev, addr, false);
 848         if (IS_ERR(rt)) {
 849                 err = PTR_ERR(rt);
 850                 goto out;
 851         }
 852
 853         neigh_parms_data_state_setall(idev->nd_parms);
 854
 855         ifa->addr = *addr;
 856         if (peer_addr)
 857                 ifa->peer_addr = *peer_addr;
 858
 859         spin_lock_init(&ifa->lock);
 860         spin_lock_init(&ifa->state_lock);
 861         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 862         INIT_HLIST_NODE(&ifa->addr_lst);
 863         ifa->scope = scope;
 864         ifa->prefix_len = pfxlen;
 865         ifa->flags = flags | IFA_F_TENTATIVE;
 866         ifa->valid_lft = valid_lft;
 867         ifa->prefered_lft = prefered_lft;
 868         ifa->cstamp = ifa->tstamp = jiffies;
 869         ifa->tokenized = false;
 870
 871         ifa->rt = rt;
 872
 873         ifa->idev = idev;
 874         in6_dev_hold(idev);
 875         /* For caller */
 876         in6_ifa_hold(ifa);
 877
 878         /* Add to big hash table */
 879         hash = inet6_addr_hash(addr);
 880
 881         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 882         spin_unlock(&addrconf_hash_lock);
 883
 884         write_lock(&idev->lock);
 885         /* Add to inet6_dev unicast addr list. */
 886         ipv6_link_dev_addr(idev, ifa);
 887
 888         if (ifa->flags&IFA_F_TEMPORARY) {
 889                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 890                 in6_ifa_hold(ifa);
 891         }
 892
 893         in6_ifa_hold(ifa);
 894         write_unlock(&idev->lock);
 895 out2:
 896         rcu_read_unlock_bh();
 897
 898         if (likely(err == 0))
 899                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 900         else {
 901                 kfree(ifa);
 902                 ifa = ERR_PTR(err);
 903         }
 904
 905         return ifa;
 906 out:
 907         spin_unlock(&addrconf_hash_lock);
 908         goto out2;
 909 }
 910
 911 enum cleanup_prefix_rt_t {
 912         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
 913         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
 914         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
 915 };
 916
 917 /*
 918  * Check, whether the prefix for ifp would still need a prefix route
 919  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
 920  * constants.
 921  *
 922  * 1) we don't purge prefix if address was not permanent.
 923  *    prefix is managed by its own lifetime.
 924  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
 925  * 3) if there are no addresses, delete prefix.
 926  * 4) if there are still other permanent address(es),
 927  *    corresponding prefix is still permanent.
 928  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
 929  *    don't purge the prefix, assume user space is managing it.
 930  * 6) otherwise, update prefix lifetime to the
 931  *    longest valid lifetime among the corresponding
 932  *    addresses on the device.
 933  *    Note: subsequent RA will update lifetime.
 934  **/
 935 static enum cleanup_prefix_rt_t
 936 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
 937 {
 938         struct inet6_ifaddr *ifa;
 939         struct inet6_dev *idev = ifp->idev;
 940         unsigned long lifetime;
 941         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
 942
 943         *expires = jiffies;
 944
 945         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 946                 if (ifa == ifp)
 947                         continue;
 948                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 949                                        ifp->prefix_len))
 950                         continue;
 951                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
 952                         return CLEANUP_PREFIX_RT_NOP;
 953
 954                 action = CLEANUP_PREFIX_RT_EXPIRE;
 955
 956                 spin_lock(&ifa->lock);
 957
 958                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 959                 /*
 960                  * Note: Because this address is
 961                  * not permanent, lifetime <
 962                  * LONG_MAX / HZ here.
 963                  */
 964                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
 965                         *expires = ifa->tstamp + lifetime * HZ;
 966                 spin_unlock(&ifa->lock);
 967         }
 968
 969         return action;
 970 }
 971
 972 static void
 973 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
 974 {
 975         struct rt6_info *rt;
 976
 977         rt = addrconf_get_prefix_route(&ifp->addr,
 978                                        ifp->prefix_len,
 979                                        ifp->idev->dev,
 980                                        0, RTF_GATEWAY | RTF_DEFAULT);
 981         if (rt) {
 982                 if (del_rt)
 983                         ip6_del_rt(rt);
 984                 else {
 985                         if (!(rt->rt6i_flags & RTF_EXPIRES))
 986                                 rt6_set_expires(rt, expires);
 987                         ip6_rt_put(rt);
 988                 }
 989         }
 990 }
 991
 992
 993 /* This function wants to get referenced ifp and releases it before return */
 994
 995 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 996 {
 997         int state;
 998         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
 999         unsigned long expires;
1000
1001         ASSERT_RTNL();
1002
1003         spin_lock_bh(&ifp->state_lock);
1004         state = ifp->state;
1005         ifp->state = INET6_IFADDR_STATE_DEAD;
1006         spin_unlock_bh(&ifp->state_lock);
1007
1008         if (state == INET6_IFADDR_STATE_DEAD)
1009                 goto out;
1010
1011         spin_lock_bh(&addrconf_hash_lock);
1012         hlist_del_init_rcu(&ifp->addr_lst);
1013         spin_unlock_bh(&addrconf_hash_lock);
1014
1015         write_lock_bh(&ifp->idev->lock);
1016
1017         if (ifp->flags&IFA_F_TEMPORARY) {
1018                 list_del(&ifp->tmp_list);
1019                 if (ifp->ifpub) {
1020                         in6_ifa_put(ifp->ifpub);
1021                         ifp->ifpub = NULL;
1022                 }
1023                 __in6_ifa_put(ifp);
1024         }
1025
1026         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1027                 action = check_cleanup_prefix_route(ifp, &expires);
1028
1029         list_del_init(&ifp->if_list);
1030         __in6_ifa_put(ifp);
1031
1032         write_unlock_bh(&ifp->idev->lock);
1033
1034         addrconf_del_dad_work(ifp);
1035
1036         ipv6_ifa_notify(RTM_DELADDR, ifp);
1037
1038         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1039
1040         if (action != CLEANUP_PREFIX_RT_NOP) {
1041                 cleanup_prefix_route(ifp, expires,
1042                         action == CLEANUP_PREFIX_RT_DEL);
1043         }
1044
1045         /* clean up prefsrc entries */
1046         rt6_remove_prefsrc(ifp);
1047 out:
1048         in6_ifa_put(ifp);
1049 }
1050
1051 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1052 {
1053         struct inet6_dev *idev = ifp->idev;
1054         struct in6_addr addr, *tmpaddr;
1055         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1056         unsigned long regen_advance;
1057         int tmp_plen;
1058         int ret = 0;
1059         u32 addr_flags;
1060         unsigned long now = jiffies;
1061
1062         write_lock_bh(&idev->lock);
1063         if (ift) {
1064                 spin_lock_bh(&ift->lock);
1065                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1066                 spin_unlock_bh(&ift->lock);
1067                 tmpaddr = &addr;
1068         } else {
1069                 tmpaddr = NULL;
1070         }
1071 retry:
1072         in6_dev_hold(idev);
1073         if (idev->cnf.use_tempaddr <= 0) {
1074                 write_unlock_bh(&idev->lock);
1075                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1076                 in6_dev_put(idev);
1077                 ret = -1;
1078                 goto out;
1079         }
1080         spin_lock_bh(&ifp->lock);
1081         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1082                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1083                 spin_unlock_bh(&ifp->lock);
1084                 write_unlock_bh(&idev->lock);
1085                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1086                         __func__);
1087                 in6_dev_put(idev);
1088                 ret = -1;
1089                 goto out;
1090         }
1091         in6_ifa_hold(ifp);
1092         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1093         __ipv6_try_regen_rndid(idev, tmpaddr);
1094         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1095         age = (now - ifp->tstamp) / HZ;
1096         tmp_valid_lft = min_t(__u32,
1097                               ifp->valid_lft,
1098                               idev->cnf.temp_valid_lft + age);
1099         tmp_prefered_lft = min_t(__u32,
1100                                  ifp->prefered_lft,
1101                                  idev->cnf.temp_prefered_lft + age -
1102                                  idev->cnf.max_desync_factor);
1103         tmp_plen = ifp->prefix_len;
1104         tmp_tstamp = ifp->tstamp;
1105         spin_unlock_bh(&ifp->lock);
1106
1107         regen_advance = idev->cnf.regen_max_retry *
1108                         idev->cnf.dad_transmits *
1109                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1110         write_unlock_bh(&idev->lock);
1111
1112         /* A temporary address is created only if this calculated Preferred
1113          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1114          * an implementation must not create a temporary address with a zero
1115          * Preferred Lifetime.
1116          * Use age calculation as in addrconf_verify to avoid unnecessary
1117          * temporary addresses being generated.
1118          */
1119         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1120         if (tmp_prefered_lft <= regen_advance + age) {
1121                 in6_ifa_put(ifp);
1122                 in6_dev_put(idev);
1123                 ret = -1;
1124                 goto out;
1125         }
1126
1127         addr_flags = IFA_F_TEMPORARY;
1128         /* set in addrconf_prefix_rcv() */
1129         if (ifp->flags & IFA_F_OPTIMISTIC)
1130                 addr_flags |= IFA_F_OPTIMISTIC;
1131
1132         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1133                             ipv6_addr_scope(&addr), addr_flags,
1134                             tmp_valid_lft, tmp_prefered_lft);
1135         if (IS_ERR(ift)) {
1136                 in6_ifa_put(ifp);
1137                 in6_dev_put(idev);
1138                 pr_info("%s: retry temporary address regeneration\n", __func__);
1139                 tmpaddr = &addr;
1140                 write_lock_bh(&idev->lock);
1141                 goto retry;
1142         }
1143
1144         spin_lock_bh(&ift->lock);
1145         ift->ifpub = ifp;
1146         ift->cstamp = now;
1147         ift->tstamp = tmp_tstamp;
1148         spin_unlock_bh(&ift->lock);
1149
1150         addrconf_dad_start(ift);
1151         in6_ifa_put(ift);
1152         in6_dev_put(idev);
1153 out:
1154         return ret;
1155 }
1156
1157 /*
1158  *      Choose an appropriate source address (RFC3484)
1159  */
1160 enum {
1161         IPV6_SADDR_RULE_INIT = 0,
1162         IPV6_SADDR_RULE_LOCAL,
1163         IPV6_SADDR_RULE_SCOPE,
1164         IPV6_SADDR_RULE_PREFERRED,
1165 #ifdef CONFIG_IPV6_MIP6
1166         IPV6_SADDR_RULE_HOA,
1167 #endif
1168         IPV6_SADDR_RULE_OIF,
1169         IPV6_SADDR_RULE_LABEL,
1170         IPV6_SADDR_RULE_PRIVACY,
1171         IPV6_SADDR_RULE_ORCHID,
1172         IPV6_SADDR_RULE_PREFIX,
1173 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1174         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1175 #endif
1176         IPV6_SADDR_RULE_MAX
1177 };
1178
1179 struct ipv6_saddr_score {
1180         int                     rule;
1181         int                     addr_type;
1182         struct inet6_ifaddr     *ifa;
1183         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1184         int                     scopedist;
1185         int                     matchlen;
1186 };
1187
1188 struct ipv6_saddr_dst {
1189         const struct in6_addr *addr;
1190         int ifindex;
1191         int scope;
1192         int label;
1193         unsigned int prefs;
1194 };
1195
1196 static inline int ipv6_saddr_preferred(int type)
1197 {
1198         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1199                 return 1;
1200         return 0;
1201 }
1202
1203 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1204 {
1205 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1206         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1207 #else
1208         return false;
1209 #endif
1210 }
1211
1212 static int ipv6_get_saddr_eval(struct net *net,
1213                                struct ipv6_saddr_score *score,
1214                                struct ipv6_saddr_dst *dst,
1215                                int i)
1216 {
1217         int ret;
1218
1219         if (i <= score->rule) {
1220                 switch (i) {
1221                 case IPV6_SADDR_RULE_SCOPE:
1222                         ret = score->scopedist;
1223                         break;
1224                 case IPV6_SADDR_RULE_PREFIX:
1225                         ret = score->matchlen;
1226                         break;
1227                 default:
1228                         ret = !!test_bit(i, score->scorebits);
1229                 }
1230                 goto out;
1231         }
1232
1233         switch (i) {
1234         case IPV6_SADDR_RULE_INIT:
1235                 /* Rule 0: remember if hiscore is not ready yet */
1236                 ret = !!score->ifa;
1237                 break;
1238         case IPV6_SADDR_RULE_LOCAL:
1239                 /* Rule 1: Prefer same address */
1240                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1241                 break;
1242         case IPV6_SADDR_RULE_SCOPE:
1243                 /* Rule 2: Prefer appropriate scope
1244                  *
1245                  *      ret
1246                  *       ^
1247                  *    -1 |  d 15
1248                  *    ---+--+-+---> scope
1249                  *       |
1250                  *       |             d is scope of the destination.
1251                  *  B-d  |  \
1252                  *       |   \      <- smaller scope is better if
1253                  *  B-15 |    \        if scope is enough for destination.
1254                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1255                  * d-C-1 | /
1256                  *       |/         <- greater is better
1257                  *   -C  /             if scope is not enough for destination.
1258                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1259                  *
1260                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1261                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1262                  * Assume B = 0 and we get C > 29.
1263                  */
1264                 ret = __ipv6_addr_src_scope(score->addr_type);
1265                 if (ret >= dst->scope)
1266                         ret = -ret;
1267                 else
1268                         ret -= 128;     /* 30 is enough */
1269                 score->scopedist = ret;
1270                 break;
1271         case IPV6_SADDR_RULE_PREFERRED:
1272             {
1273                 /* Rule 3: Avoid deprecated and optimistic addresses */
1274                 u8 avoid = IFA_F_DEPRECATED;
1275
1276                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1277                         avoid |= IFA_F_OPTIMISTIC;
1278                 ret = ipv6_saddr_preferred(score->addr_type) ||
1279                       !(score->ifa->flags & avoid);
1280                 break;
1281             }
1282 #ifdef CONFIG_IPV6_MIP6
1283         case IPV6_SADDR_RULE_HOA:
1284             {
1285                 /* Rule 4: Prefer home address */
1286                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1287                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1288                 break;
1289             }
1290 #endif
1291         case IPV6_SADDR_RULE_OIF:
1292                 /* Rule 5: Prefer outgoing interface */
1293                 ret = (!dst->ifindex ||
1294                        dst->ifindex == score->ifa->idev->dev->ifindex);
1295                 break;
1296         case IPV6_SADDR_RULE_LABEL:
1297                 /* Rule 6: Prefer matching label */
1298                 ret = ipv6_addr_label(net,
1299                                       &score->ifa->addr, score->addr_type,
1300                                       score->ifa->idev->dev->ifindex) == dst->label;
1301                 break;
1302         case IPV6_SADDR_RULE_PRIVACY:
1303             {
1304                 /* Rule 7: Prefer public address
1305                  * Note: prefer temporary address if use_tempaddr >= 2
1306                  */
1307                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1308                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1309                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1310                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1311                 break;
1312             }
1313         case IPV6_SADDR_RULE_ORCHID:
1314                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1315                  *          non-ORCHID vs non-ORCHID
1316                  */
1317                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1318                         ipv6_addr_orchid(dst->addr));
1319                 break;
1320         case IPV6_SADDR_RULE_PREFIX:
1321                 /* Rule 8: Use longest matching prefix */
1322                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1323                 if (ret > score->ifa->prefix_len)
1324                         ret = score->ifa->prefix_len;
1325                 score->matchlen = ret;
1326                 break;
1327 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1328         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1329                 /* Optimistic addresses still have lower precedence than other
1330                  * preferred addresses.
1331                  */
1332                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1333                 break;
1334 #endif
1335         default:
1336                 ret = 0;
1337         }
1338
1339         if (ret)
1340                 __set_bit(i, score->scorebits);
1341         score->rule = i;
1342 out:
1343         return ret;
1344 }
1345
1346 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1347                        const struct in6_addr *daddr, unsigned int prefs,
1348                        struct in6_addr *saddr)
1349 {
1350         struct ipv6_saddr_score scores[2],
1351                                 *score = &scores[0], *hiscore = &scores[1];
1352         struct ipv6_saddr_dst dst;
1353         struct net_device *dev;
1354         int dst_type;
1355
1356         dst_type = __ipv6_addr_type(daddr);
1357         dst.addr = daddr;
1358         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1359         dst.scope = __ipv6_addr_src_scope(dst_type);
1360         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1361         dst.prefs = prefs;
1362
1363         hiscore->rule = -1;
1364         hiscore->ifa = NULL;
1365
1366         rcu_read_lock();
1367
1368         for_each_netdev_rcu(net, dev) {
1369                 struct inet6_dev *idev;
1370
1371                 /* Candidate Source Address (section 4)
1372                  *  - multicast and link-local destination address,
1373                  *    the set of candidate source address MUST only
1374                  *    include addresses assigned to interfaces
1375                  *    belonging to the same link as the outgoing
1376                  *    interface.
1377                  * (- For site-local destination addresses, the
1378                  *    set of candidate source addresses MUST only
1379                  *    include addresses assigned to interfaces
1380                  *    belonging to the same site as the outgoing
1381                  *    interface.)
1382                  */
1383                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1384                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1385                     dst.ifindex && dev->ifindex != dst.ifindex)
1386                         continue;
1387
1388                 idev = __in6_dev_get(dev);
1389                 if (!idev)
1390                         continue;
1391
1392                 read_lock_bh(&idev->lock);
1393                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1394                         int i;
1395
1396                         /*
1397                          * - Tentative Address (RFC2462 section 5.4)
1398                          *  - A tentative address is not considered
1399                          *    "assigned to an interface" in the traditional
1400                          *    sense, unless it is also flagged as optimistic.
1401                          * - Candidate Source Address (section 4)
1402                          *  - In any case, anycast addresses, multicast
1403                          *    addresses, and the unspecified address MUST
1404                          *    NOT be included in a candidate set.
1405                          */
1406                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1407                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1408                                 continue;
1409
1410                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1411
1412                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1413                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1414                                 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1415                                                     dev->name);
1416                                 continue;
1417                         }
1418
1419                         score->rule = -1;
1420                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1421
1422                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1423                                 int minihiscore, miniscore;
1424
1425                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1426                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1427
1428                                 if (minihiscore > miniscore) {
1429                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1430                                             score->scopedist > 0) {
1431                                                 /*
1432                                                  * special case:
1433                                                  * each remaining entry
1434                                                  * has too small (not enough)
1435                                                  * scope, because ifa entries
1436                                                  * are sorted by their scope
1437                                                  * values.
1438                                                  */
1439                                                 goto try_nextdev;
1440                                         }
1441                                         break;
1442                                 } else if (minihiscore < miniscore) {
1443                                         if (hiscore->ifa)
1444                                                 in6_ifa_put(hiscore->ifa);
1445
1446                                         in6_ifa_hold(score->ifa);
1447
1448                                         swap(hiscore, score);
1449
1450                                         /* restore our iterator */
1451                                         score->ifa = hiscore->ifa;
1452
1453                                         break;
1454                                 }
1455                         }
1456                 }
1457 try_nextdev:
1458                 read_unlock_bh(&idev->lock);
1459         }
1460         rcu_read_unlock();
1461
1462         if (!hiscore->ifa)
1463                 return -EADDRNOTAVAIL;
1464
1465         *saddr = hiscore->ifa->addr;
1466         in6_ifa_put(hiscore->ifa);
1467         return 0;
1468 }
1469 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1470
1471 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1472                       u32 banned_flags)
1473 {
1474         struct inet6_ifaddr *ifp;
1475         int err = -EADDRNOTAVAIL;
1476
1477         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1478                 if (ifp->scope > IFA_LINK)
1479                         break;
1480                 if (ifp->scope == IFA_LINK &&
1481                     !(ifp->flags & banned_flags)) {
1482                         *addr = ifp->addr;
1483                         err = 0;
1484                         break;
1485                 }
1486         }
1487         return err;
1488 }
1489
1490 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1491                     u32 banned_flags)
1492 {
1493         struct inet6_dev *idev;
1494         int err = -EADDRNOTAVAIL;
1495
1496         rcu_read_lock();
1497         idev = __in6_dev_get(dev);
1498         if (idev) {
1499                 read_lock_bh(&idev->lock);
1500                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1501                 read_unlock_bh(&idev->lock);
1502         }
1503         rcu_read_unlock();
1504         return err;
1505 }
1506
1507 static int ipv6_count_addresses(struct inet6_dev *idev)
1508 {
1509         int cnt = 0;
1510         struct inet6_ifaddr *ifp;
1511
1512         read_lock_bh(&idev->lock);
1513         list_for_each_entry(ifp, &idev->addr_list, if_list)
1514                 cnt++;
1515         read_unlock_bh(&idev->lock);
1516         return cnt;
1517 }
1518
1519 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1520                   const struct net_device *dev, int strict)
1521 {
1522         struct inet6_ifaddr *ifp;
1523         unsigned int hash = inet6_addr_hash(addr);
1524
1525         rcu_read_lock_bh();
1526         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1527                 if (!net_eq(dev_net(ifp->idev->dev), net))
1528                         continue;
1529                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1530                     !(ifp->flags&IFA_F_TENTATIVE) &&
1531                     (dev == NULL || ifp->idev->dev == dev ||
1532                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1533                         rcu_read_unlock_bh();
1534                         return 1;
1535                 }
1536         }
1537
1538         rcu_read_unlock_bh();
1539         return 0;
1540 }
1541 EXPORT_SYMBOL(ipv6_chk_addr);
1542
1543 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1544                                struct net_device *dev)
1545 {
1546         unsigned int hash = inet6_addr_hash(addr);
1547         struct inet6_ifaddr *ifp;
1548
1549         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1550                 if (!net_eq(dev_net(ifp->idev->dev), net))
1551                         continue;
1552                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1553                         if (dev == NULL || ifp->idev->dev == dev)
1554                                 return true;
1555                 }
1556         }
1557         return false;
1558 }
1559
1560 /* Compares an address/prefix_len with addresses on device @dev.
1561  * If one is found it returns true.
1562  */
1563 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1564         const unsigned int prefix_len, struct net_device *dev)
1565 {
1566         struct inet6_dev *idev;
1567         struct inet6_ifaddr *ifa;
1568         bool ret = false;
1569
1570         rcu_read_lock();
1571         idev = __in6_dev_get(dev);
1572         if (idev) {
1573                 read_lock_bh(&idev->lock);
1574                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1575                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1576                         if (ret)
1577                                 break;
1578                 }
1579                 read_unlock_bh(&idev->lock);
1580         }
1581         rcu_read_unlock();
1582
1583         return ret;
1584 }
1585 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1586
1587 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1588 {
1589         struct inet6_dev *idev;
1590         struct inet6_ifaddr *ifa;
1591         int     onlink;
1592
1593         onlink = 0;
1594         rcu_read_lock();
1595         idev = __in6_dev_get(dev);
1596         if (idev) {
1597                 read_lock_bh(&idev->lock);
1598                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1599                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1600                                                    ifa->prefix_len);
1601                         if (onlink)
1602                                 break;
1603                 }
1604                 read_unlock_bh(&idev->lock);
1605         }
1606         rcu_read_unlock();
1607         return onlink;
1608 }
1609 EXPORT_SYMBOL(ipv6_chk_prefix);
1610
1611 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1612                                      struct net_device *dev, int strict)
1613 {
1614         struct inet6_ifaddr *ifp, *result = NULL;
1615         unsigned int hash = inet6_addr_hash(addr);
1616
1617         rcu_read_lock_bh();
1618         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1619                 if (!net_eq(dev_net(ifp->idev->dev), net))
1620                         continue;
1621                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1622                         if (dev == NULL || ifp->idev->dev == dev ||
1623                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1624                                 result = ifp;
1625                                 in6_ifa_hold(ifp);
1626                                 break;
1627                         }
1628                 }
1629         }
1630         rcu_read_unlock_bh();
1631
1632         return result;
1633 }
1634
1635 /* Gets referenced address, destroys ifaddr */
1636
1637 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1638 {
1639         if (ifp->flags&IFA_F_PERMANENT) {
1640                 spin_lock_bh(&ifp->lock);
1641                 addrconf_del_dad_work(ifp);
1642                 ifp->flags |= IFA_F_TENTATIVE;
1643                 if (dad_failed)
1644                         ifp->flags |= IFA_F_DADFAILED;
1645                 spin_unlock_bh(&ifp->lock);
1646                 if (dad_failed)
1647                         ipv6_ifa_notify(0, ifp);
1648                 in6_ifa_put(ifp);
1649         } else if (ifp->flags&IFA_F_TEMPORARY) {
1650                 struct inet6_ifaddr *ifpub;
1651                 spin_lock_bh(&ifp->lock);
1652                 ifpub = ifp->ifpub;
1653                 if (ifpub) {
1654                         in6_ifa_hold(ifpub);
1655                         spin_unlock_bh(&ifp->lock);
1656                         ipv6_create_tempaddr(ifpub, ifp);
1657                         in6_ifa_put(ifpub);
1658                 } else {
1659                         spin_unlock_bh(&ifp->lock);
1660                 }
1661                 ipv6_del_addr(ifp);
1662         } else {
1663                 ipv6_del_addr(ifp);
1664         }
1665 }
1666
1667 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1668 {
1669         int err = -ENOENT;
1670
1671         spin_lock_bh(&ifp->state_lock);
1672         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1673                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1674                 err = 0;
1675         }
1676         spin_unlock_bh(&ifp->state_lock);
1677
1678         return err;
1679 }
1680
1681 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1682 {
1683         struct inet6_dev *idev = ifp->idev;
1684
1685         if (addrconf_dad_end(ifp)) {
1686                 in6_ifa_put(ifp);
1687                 return;
1688         }
1689
1690         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1691                              ifp->idev->dev->name, &ifp->addr);
1692
1693         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1694                 struct in6_addr addr;
1695
1696                 addr.s6_addr32[0] = htonl(0xfe800000);
1697                 addr.s6_addr32[1] = 0;
1698
1699                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1700                     ipv6_addr_equal(&ifp->addr, &addr)) {
1701                         /* DAD failed for link-local based on MAC address */
1702                         idev->cnf.disable_ipv6 = 1;
1703
1704                         pr_info("%s: IPv6 being disabled!\n",
1705                                 ifp->idev->dev->name);
1706                 }
1707         }
1708
1709         spin_lock_bh(&ifp->state_lock);
1710         /* transition from _POSTDAD to _ERRDAD */
1711         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1712         spin_unlock_bh(&ifp->state_lock);
1713
1714         addrconf_mod_dad_work(ifp, 0);
1715 }
1716
1717 /* Join to solicited addr multicast group.
1718  * caller must hold RTNL */
1719 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1720 {
1721         struct in6_addr maddr;
1722
1723         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1724                 return;
1725
1726         addrconf_addr_solict_mult(addr, &maddr);
1727         ipv6_dev_mc_inc(dev, &maddr);
1728 }
1729
1730 /* caller must hold RTNL */
1731 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1732 {
1733         struct in6_addr maddr;
1734
1735         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1736                 return;
1737
1738         addrconf_addr_solict_mult(addr, &maddr);
1739         __ipv6_dev_mc_dec(idev, &maddr);
1740 }
1741
1742 /* caller must hold RTNL */
1743 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1744 {
1745         struct in6_addr addr;
1746
1747         if (ifp->prefix_len >= 127) /* RFC 6164 */
1748                 return;
1749         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1750         if (ipv6_addr_any(&addr))
1751                 return;
1752         __ipv6_dev_ac_inc(ifp->idev, &addr);
1753 }
1754
1755 /* caller must hold RTNL */
1756 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1757 {
1758         struct in6_addr addr;
1759
1760         if (ifp->prefix_len >= 127) /* RFC 6164 */
1761                 return;
1762         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1763         if (ipv6_addr_any(&addr))
1764                 return;
1765         __ipv6_dev_ac_dec(ifp->idev, &addr);
1766 }
1767
1768 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1769 {
1770         if (dev->addr_len != ETH_ALEN)
1771                 return -1;
1772         memcpy(eui, dev->dev_addr, 3);
1773         memcpy(eui + 5, dev->dev_addr + 3, 3);
1774
1775         /*
1776          * The zSeries OSA network cards can be shared among various
1777          * OS instances, but the OSA cards have only one MAC address.
1778          * This leads to duplicate address conflicts in conjunction
1779          * with IPv6 if more than one instance uses the same card.
1780          *
1781          * The driver for these cards can deliver a unique 16-bit
1782          * identifier for each instance sharing the same card.  It is
1783          * placed instead of 0xFFFE in the interface identifier.  The
1784          * "u" bit of the interface identifier is not inverted in this
1785          * case.  Hence the resulting interface identifier has local
1786          * scope according to RFC2373.
1787          */
1788         if (dev->dev_id) {
1789                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1790                 eui[4] = dev->dev_id & 0xFF;
1791         } else {
1792                 eui[3] = 0xFF;
1793                 eui[4] = 0xFE;
1794                 eui[0] ^= 2;
1795         }
1796         return 0;
1797 }
1798
1799 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1800 {
1801         if (dev->addr_len != IEEE802154_ADDR_LEN)
1802                 return -1;
1803         memcpy(eui, dev->dev_addr, 8);
1804         eui[0] ^= 2;
1805         return 0;
1806 }
1807
1808 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1809 {
1810         union fwnet_hwaddr *ha;
1811
1812         if (dev->addr_len != FWNET_ALEN)
1813                 return -1;
1814
1815         ha = (union fwnet_hwaddr *)dev->dev_addr;
1816
1817         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1818         eui[0] ^= 2;
1819         return 0;
1820 }
1821
1822 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1823 {
1824         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1825         if (dev->addr_len != ARCNET_ALEN)
1826                 return -1;
1827         memset(eui, 0, 7);
1828         eui[7] = *(u8 *)dev->dev_addr;
1829         return 0;
1830 }
1831
1832 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1833 {
1834         if (dev->addr_len != INFINIBAND_ALEN)
1835                 return -1;
1836         memcpy(eui, dev->dev_addr + 12, 8);
1837         eui[0] |= 2;
1838         return 0;
1839 }
1840
1841 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1842 {
1843         if (addr == 0)
1844                 return -1;
1845         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1846                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1847                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1848                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1849                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1850                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1851         eui[1] = 0;
1852         eui[2] = 0x5E;
1853         eui[3] = 0xFE;
1854         memcpy(eui + 4, &addr, 4);
1855         return 0;
1856 }
1857
1858 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1859 {
1860         if (dev->priv_flags & IFF_ISATAP)
1861                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1862         return -1;
1863 }
1864
1865 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1866 {
1867         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1868 }
1869
1870 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1871 {
1872         memcpy(eui, dev->perm_addr, 3);
1873         memcpy(eui + 5, dev->perm_addr + 3, 3);
1874         eui[3] = 0xFF;
1875         eui[4] = 0xFE;
1876         eui[0] ^= 2;
1877         return 0;
1878 }
1879
1880 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1881 {
1882         switch (dev->type) {
1883         case ARPHRD_ETHER:
1884         case ARPHRD_FDDI:
1885                 return addrconf_ifid_eui48(eui, dev);
1886         case ARPHRD_ARCNET:
1887                 return addrconf_ifid_arcnet(eui, dev);
1888         case ARPHRD_INFINIBAND:
1889                 return addrconf_ifid_infiniband(eui, dev);
1890         case ARPHRD_SIT:
1891                 return addrconf_ifid_sit(eui, dev);
1892         case ARPHRD_IPGRE:
1893                 return addrconf_ifid_gre(eui, dev);
1894         case ARPHRD_6LOWPAN:
1895         case ARPHRD_IEEE802154:
1896                 return addrconf_ifid_eui64(eui, dev);
1897         case ARPHRD_IEEE1394:
1898                 return addrconf_ifid_ieee1394(eui, dev);
1899         case ARPHRD_TUNNEL6:
1900                 return addrconf_ifid_ip6tnl(eui, dev);
1901         }
1902         return -1;
1903 }
1904
1905 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1906 {
1907         int err = -1;
1908         struct inet6_ifaddr *ifp;
1909
1910         read_lock_bh(&idev->lock);
1911         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1912                 if (ifp->scope > IFA_LINK)
1913                         break;
1914                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1915                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1916                         err = 0;
1917                         break;
1918                 }
1919         }
1920         read_unlock_bh(&idev->lock);
1921         return err;
1922 }
1923
1924 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1925 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1926 {
1927 regen:
1928         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1929         idev->rndid[0] &= ~0x02;
1930
1931         /*
1932          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1933          * check if generated address is not inappropriate
1934          *
1935          *  - Reserved subnet anycast (RFC 2526)
1936          *      11111101 11....11 1xxxxxxx
1937          *  - ISATAP (RFC4214) 6.1
1938          *      00-00-5E-FE-xx-xx-xx-xx
1939          *  - value 0
1940          *  - XXX: already assigned to an address on the device
1941          */
1942         if (idev->rndid[0] == 0xfd &&
1943             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1944             (idev->rndid[7]&0x80))
1945                 goto regen;
1946         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1947                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1948                         goto regen;
1949                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1950                         goto regen;
1951         }
1952 }
1953
1954 static void ipv6_regen_rndid(unsigned long data)
1955 {
1956         struct inet6_dev *idev = (struct inet6_dev *) data;
1957         unsigned long expires;
1958
1959         rcu_read_lock_bh();
1960         write_lock_bh(&idev->lock);
1961
1962         if (idev->dead)
1963                 goto out;
1964
1965         __ipv6_regen_rndid(idev);
1966
1967         expires = jiffies +
1968                 idev->cnf.temp_prefered_lft * HZ -
1969                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1970                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1971                 idev->cnf.max_desync_factor * HZ;
1972         if (time_before(expires, jiffies)) {
1973                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1974                         __func__, idev->dev->name);
1975                 goto out;
1976         }
1977
1978         if (!mod_timer(&idev->regen_timer, expires))
1979                 in6_dev_hold(idev);
1980
1981 out:
1982         write_unlock_bh(&idev->lock);
1983         rcu_read_unlock_bh();
1984         in6_dev_put(idev);
1985 }
1986
1987 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1988 {
1989         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1990                 __ipv6_regen_rndid(idev);
1991 }
1992
1993 /*
1994  *      Add prefix route.
1995  */
1996
1997 static void
1998 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1999                       unsigned long expires, u32 flags)
2000 {
2001         struct fib6_config cfg = {
2002                 .fc_table = RT6_TABLE_PREFIX,
2003                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2004                 .fc_ifindex = dev->ifindex,
2005                 .fc_expires = expires,
2006                 .fc_dst_len = plen,
2007                 .fc_flags = RTF_UP | flags,
2008                 .fc_nlinfo.nl_net = dev_net(dev),
2009                 .fc_protocol = RTPROT_KERNEL,
2010         };
2011
2012         cfg.fc_dst = *pfx;
2013
2014         /* Prevent useless cloning on PtP SIT.
2015            This thing is done here expecting that the whole
2016            class of non-broadcast devices need not cloning.
2017          */
2018 #if IS_ENABLED(CONFIG_IPV6_SIT)
2019         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2020                 cfg.fc_flags |= RTF_NONEXTHOP;
2021 #endif
2022
2023         ip6_route_add(&cfg);
2024 }
2025
2026
2027 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2028                                                   int plen,
2029                                                   const struct net_device *dev,
2030                                                   u32 flags, u32 noflags)
2031 {
2032         struct fib6_node *fn;
2033         struct rt6_info *rt = NULL;
2034         struct fib6_table *table;
2035
2036         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2037         if (table == NULL)
2038                 return NULL;
2039
2040         read_lock_bh(&table->tb6_lock);
2041         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2042         if (!fn)
2043                 goto out;
2044         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2045                 if (rt->dst.dev->ifindex != dev->ifindex)
2046                         continue;
2047                 if ((rt->rt6i_flags & flags) != flags)
2048                         continue;
2049                 if ((rt->rt6i_flags & noflags) != 0)
2050                         continue;
2051                 dst_hold(&rt->dst);
2052                 break;
2053         }
2054 out:
2055         read_unlock_bh(&table->tb6_lock);
2056         return rt;
2057 }
2058
2059
2060 /* Create "default" multicast route to the interface */
2061
2062 static void addrconf_add_mroute(struct net_device *dev)
2063 {
2064         struct fib6_config cfg = {
2065                 .fc_table = RT6_TABLE_LOCAL,
2066                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2067                 .fc_ifindex = dev->ifindex,
2068                 .fc_dst_len = 8,
2069                 .fc_flags = RTF_UP,
2070                 .fc_nlinfo.nl_net = dev_net(dev),
2071         };
2072
2073         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2074
2075         ip6_route_add(&cfg);
2076 }
2077
2078 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2079 {
2080         struct inet6_dev *idev;
2081
2082         ASSERT_RTNL();
2083
2084         idev = ipv6_find_idev(dev);
2085         if (!idev)
2086                 return ERR_PTR(-ENOBUFS);
2087
2088         if (idev->cnf.disable_ipv6)
2089                 return ERR_PTR(-EACCES);
2090
2091         /* Add default multicast route */
2092         if (!(dev->flags & IFF_LOOPBACK))
2093                 addrconf_add_mroute(dev);
2094
2095         return idev;
2096 }
2097
2098 static void manage_tempaddrs(struct inet6_dev *idev,
2099                              struct inet6_ifaddr *ifp,
2100                              __u32 valid_lft, __u32 prefered_lft,
2101                              bool create, unsigned long now)
2102 {
2103         u32 flags;
2104         struct inet6_ifaddr *ift;
2105
2106         read_lock_bh(&idev->lock);
2107         /* update all temporary addresses in the list */
2108         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2109                 int age, max_valid, max_prefered;
2110
2111                 if (ifp != ift->ifpub)
2112                         continue;
2113
2114                 /* RFC 4941 section 3.3:
2115                  * If a received option will extend the lifetime of a public
2116                  * address, the lifetimes of temporary addresses should
2117                  * be extended, subject to the overall constraint that no
2118                  * temporary addresses should ever remain "valid" or "preferred"
2119                  * for a time longer than (TEMP_VALID_LIFETIME) or
2120                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2121                  */
2122                 age = (now - ift->cstamp) / HZ;
2123                 max_valid = idev->cnf.temp_valid_lft - age;
2124                 if (max_valid < 0)
2125                         max_valid = 0;
2126
2127                 max_prefered = idev->cnf.temp_prefered_lft -
2128                                idev->cnf.max_desync_factor - age;
2129                 if (max_prefered < 0)
2130                         max_prefered = 0;
2131
2132                 if (valid_lft > max_valid)
2133                         valid_lft = max_valid;
2134
2135                 if (prefered_lft > max_prefered)
2136                         prefered_lft = max_prefered;
2137
2138                 spin_lock(&ift->lock);
2139                 flags = ift->flags;
2140                 ift->valid_lft = valid_lft;
2141                 ift->prefered_lft = prefered_lft;
2142                 ift->tstamp = now;
2143                 if (prefered_lft > 0)
2144                         ift->flags &= ~IFA_F_DEPRECATED;
2145
2146                 spin_unlock(&ift->lock);
2147                 if (!(flags&IFA_F_TENTATIVE))
2148                         ipv6_ifa_notify(0, ift);
2149         }
2150
2151         if ((create || list_empty(&idev->tempaddr_list)) &&
2152             idev->cnf.use_tempaddr > 0) {
2153                 /* When a new public address is created as described
2154                  * in [ADDRCONF], also create a new temporary address.
2155                  * Also create a temporary address if it's enabled but
2156                  * no temporary address currently exists.
2157                  */
2158                 read_unlock_bh(&idev->lock);
2159                 ipv6_create_tempaddr(ifp, NULL);
2160         } else {
2161                 read_unlock_bh(&idev->lock);
2162         }
2163 }
2164
2165 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2166 {
2167         struct prefix_info *pinfo;
2168         __u32 valid_lft;
2169         __u32 prefered_lft;
2170         int addr_type;
2171         struct inet6_dev *in6_dev;
2172         struct net *net = dev_net(dev);
2173
2174         pinfo = (struct prefix_info *) opt;
2175
2176         if (len < sizeof(struct prefix_info)) {
2177                 ADBG("addrconf: prefix option too short\n");
2178                 return;
2179         }
2180
2181         /*
2182          *      Validation checks ([ADDRCONF], page 19)
2183          */
2184
2185         addr_type = ipv6_addr_type(&pinfo->prefix);
2186
2187         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2188                 return;
2189
2190         valid_lft = ntohl(pinfo->valid);
2191         prefered_lft = ntohl(pinfo->prefered);
2192
2193         if (prefered_lft > valid_lft) {
2194                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2195                 return;
2196         }
2197
2198         in6_dev = in6_dev_get(dev);
2199
2200         if (in6_dev == NULL) {
2201                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2202                                     dev->name);
2203                 return;
2204         }
2205
2206         /*
2207          *      Two things going on here:
2208          *      1) Add routes for on-link prefixes
2209          *      2) Configure prefixes with the auto flag set
2210          */
2211
2212         if (pinfo->onlink) {
2213                 struct rt6_info *rt;
2214                 unsigned long rt_expires;
2215
2216                 /* Avoid arithmetic overflow. Really, we could
2217                  * save rt_expires in seconds, likely valid_lft,
2218                  * but it would require division in fib gc, that it
2219                  * not good.
2220                  */
2221                 if (HZ > USER_HZ)
2222                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2223                 else
2224                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2225
2226                 if (addrconf_finite_timeout(rt_expires))
2227                         rt_expires *= HZ;
2228
2229                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2230                                                pinfo->prefix_len,
2231                                                dev,
2232                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2233                                                RTF_GATEWAY | RTF_DEFAULT);
2234
2235                 if (rt) {
2236                         /* Autoconf prefix route */
2237                         if (valid_lft == 0) {
2238                                 ip6_del_rt(rt);
2239                                 rt = NULL;
2240                         } else if (addrconf_finite_timeout(rt_expires)) {
2241                                 /* not infinity */
2242                                 rt6_set_expires(rt, jiffies + rt_expires);
2243                         } else {
2244                                 rt6_clean_expires(rt);
2245                         }
2246                 } else if (valid_lft) {
2247                         clock_t expires = 0;
2248                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2249                         if (addrconf_finite_timeout(rt_expires)) {
2250                                 /* not infinity */
2251                                 flags |= RTF_EXPIRES;
2252                                 expires = jiffies_to_clock_t(rt_expires);
2253                         }
2254                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2255                                               dev, expires, flags);
2256                 }
2257                 ip6_rt_put(rt);
2258         }
2259
2260         /* Try to figure out our local address for this prefix */
2261
2262         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2263                 struct inet6_ifaddr *ifp;
2264                 struct in6_addr addr;
2265                 int create = 0, update_lft = 0;
2266                 bool tokenized = false;
2267
2268                 if (pinfo->prefix_len == 64) {
2269                         memcpy(&addr, &pinfo->prefix, 8);
2270
2271                         if (!ipv6_addr_any(&in6_dev->token)) {
2272                                 read_lock_bh(&in6_dev->lock);
2273                                 memcpy(addr.s6_addr + 8,
2274                                        in6_dev->token.s6_addr + 8, 8);
2275                                 read_unlock_bh(&in6_dev->lock);
2276                                 tokenized = true;
2277                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2278                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2279                                 in6_dev_put(in6_dev);
2280                                 return;
2281                         }
2282                         goto ok;
2283                 }
2284                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2285                                     pinfo->prefix_len);
2286                 in6_dev_put(in6_dev);
2287                 return;
2288
2289 ok:
2290
2291                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2292
2293                 if (ifp == NULL && valid_lft) {
2294                         int max_addresses = in6_dev->cnf.max_addresses;
2295                         u32 addr_flags = 0;
2296
2297 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2298                         if (in6_dev->cnf.optimistic_dad &&
2299                             !net->ipv6.devconf_all->forwarding && sllao)
2300                                 addr_flags = IFA_F_OPTIMISTIC;
2301 #endif
2302
2303                         /* Do not allow to create too much of autoconfigured
2304                          * addresses; this would be too easy way to crash kernel.
2305                          */
2306                         if (!max_addresses ||
2307                             ipv6_count_addresses(in6_dev) < max_addresses)
2308                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2309                                                     pinfo->prefix_len,
2310                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2311                                                     addr_flags, valid_lft,
2312                                                     prefered_lft);
2313
2314                         if (IS_ERR_OR_NULL(ifp)) {
2315                                 in6_dev_put(in6_dev);
2316                                 return;
2317                         }
2318
2319                         update_lft = 0;
2320                         create = 1;
2321                         spin_lock_bh(&ifp->lock);
2322                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2323                         ifp->cstamp = jiffies;
2324                         ifp->tokenized = tokenized;
2325                         spin_unlock_bh(&ifp->lock);
2326                         addrconf_dad_start(ifp);
2327                 }
2328
2329                 if (ifp) {
2330                         u32 flags;
2331                         unsigned long now;
2332                         u32 stored_lft;
2333
2334                         /* update lifetime (RFC2462 5.5.3 e) */
2335                         spin_lock(&ifp->lock);
2336                         now = jiffies;
2337                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2338                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2339                         else
2340                                 stored_lft = 0;
2341                         if (!update_lft && !create && stored_lft) {
2342                                 const u32 minimum_lft = min_t(u32,
2343                                         stored_lft, MIN_VALID_LIFETIME);
2344                                 valid_lft = max(valid_lft, minimum_lft);
2345
2346                                 /* RFC4862 Section 5.5.3e:
2347                                  * "Note that the preferred lifetime of the
2348                                  *  corresponding address is always reset to
2349                                  *  the Preferred Lifetime in the received
2350                                  *  Prefix Information option, regardless of
2351                                  *  whether the valid lifetime is also reset or
2352                                  *  ignored."
2353                                  *
2354                                  * So we should always update prefered_lft here.
2355                                  */
2356                                 update_lft = 1;
2357                         }
2358
2359                         if (update_lft) {
2360                                 ifp->valid_lft = valid_lft;
2361                                 ifp->prefered_lft = prefered_lft;
2362                                 ifp->tstamp = now;
2363                                 flags = ifp->flags;
2364                                 ifp->flags &= ~IFA_F_DEPRECATED;
2365                                 spin_unlock(&ifp->lock);
2366
2367                                 if (!(flags&IFA_F_TENTATIVE))
2368                                         ipv6_ifa_notify(0, ifp);
2369                         } else
2370                                 spin_unlock(&ifp->lock);
2371
2372                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2373                                          create, now);
2374
2375                         in6_ifa_put(ifp);
2376                         addrconf_verify();
2377                 }
2378         }
2379         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2380         in6_dev_put(in6_dev);
2381 }
2382
2383 /*
2384  *      Set destination address.
2385  *      Special case for SIT interfaces where we create a new "virtual"
2386  *      device.
2387  */
2388 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2389 {
2390         struct in6_ifreq ireq;
2391         struct net_device *dev;
2392         int err = -EINVAL;
2393
2394         rtnl_lock();
2395
2396         err = -EFAULT;
2397         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2398                 goto err_exit;
2399
2400         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2401
2402         err = -ENODEV;
2403         if (dev == NULL)
2404                 goto err_exit;
2405
2406 #if IS_ENABLED(CONFIG_IPV6_SIT)
2407         if (dev->type == ARPHRD_SIT) {
2408                 const struct net_device_ops *ops = dev->netdev_ops;
2409                 struct ifreq ifr;
2410                 struct ip_tunnel_parm p;
2411
2412                 err = -EADDRNOTAVAIL;
2413                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2414                         goto err_exit;
2415
2416                 memset(&p, 0, sizeof(p));
2417                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2418                 p.iph.saddr = 0;
2419                 p.iph.version = 4;
2420                 p.iph.ihl = 5;
2421                 p.iph.protocol = IPPROTO_IPV6;
2422                 p.iph.ttl = 64;
2423                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2424
2425                 if (ops->ndo_do_ioctl) {
2426                         mm_segment_t oldfs = get_fs();
2427
2428                         set_fs(KERNEL_DS);
2429                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2430                         set_fs(oldfs);
2431                 } else
2432                         err = -EOPNOTSUPP;
2433
2434                 if (err == 0) {
2435                         err = -ENOBUFS;
2436                         dev = __dev_get_by_name(net, p.name);
2437                         if (!dev)
2438                                 goto err_exit;
2439                         err = dev_open(dev);
2440                 }
2441         }
2442 #endif
2443
2444 err_exit:
2445         rtnl_unlock();
2446         return err;
2447 }
2448
2449 /*
2450  *      Manual configuration of address on an interface
2451  */
2452 static int inet6_addr_add(struct net *net, int ifindex,
2453                           const struct in6_addr *pfx,
2454                           const struct in6_addr *peer_pfx,
2455                           unsigned int plen, __u32 ifa_flags,
2456                           __u32 prefered_lft, __u32 valid_lft)
2457 {
2458         struct inet6_ifaddr *ifp;
2459         struct inet6_dev *idev;
2460         struct net_device *dev;
2461         int scope;
2462         u32 flags;
2463         clock_t expires;
2464         unsigned long timeout;
2465
2466         ASSERT_RTNL();
2467
2468         if (plen > 128)
2469                 return -EINVAL;
2470
2471         /* check the lifetime */
2472         if (!valid_lft || prefered_lft > valid_lft)
2473                 return -EINVAL;
2474
2475         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2476                 return -EINVAL;
2477
2478         dev = __dev_get_by_index(net, ifindex);
2479         if (!dev)
2480                 return -ENODEV;
2481
2482         idev = addrconf_add_dev(dev);
2483         if (IS_ERR(idev))
2484                 return PTR_ERR(idev);
2485
2486         scope = ipv6_addr_scope(pfx);
2487
2488         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2489         if (addrconf_finite_timeout(timeout)) {
2490                 expires = jiffies_to_clock_t(timeout * HZ);
2491                 valid_lft = timeout;
2492                 flags = RTF_EXPIRES;
2493         } else {
2494                 expires = 0;
2495                 flags = 0;
2496                 ifa_flags |= IFA_F_PERMANENT;
2497         }
2498
2499         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2500         if (addrconf_finite_timeout(timeout)) {
2501                 if (timeout == 0)
2502                         ifa_flags |= IFA_F_DEPRECATED;
2503                 prefered_lft = timeout;
2504         }
2505
2506         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2507                             valid_lft, prefered_lft);
2508
2509         if (!IS_ERR(ifp)) {
2510                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2511                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2512                                               expires, flags);
2513                 }
2514
2515                 /*
2516                  * Note that section 3.1 of RFC 4429 indicates
2517                  * that the Optimistic flag should not be set for
2518                  * manually configured addresses
2519                  */
2520                 addrconf_dad_start(ifp);
2521                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2522                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2523                                          true, jiffies);
2524                 in6_ifa_put(ifp);
2525                 addrconf_verify_rtnl();
2526                 return 0;
2527         }
2528
2529         return PTR_ERR(ifp);
2530 }
2531
2532 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2533                           const struct in6_addr *pfx, unsigned int plen)
2534 {
2535         struct inet6_ifaddr *ifp;
2536         struct inet6_dev *idev;
2537         struct net_device *dev;
2538
2539         if (plen > 128)
2540                 return -EINVAL;
2541
2542         dev = __dev_get_by_index(net, ifindex);
2543         if (!dev)
2544                 return -ENODEV;
2545
2546         idev = __in6_dev_get(dev);
2547         if (idev == NULL)
2548                 return -ENXIO;
2549
2550         read_lock_bh(&idev->lock);
2551         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2552                 if (ifp->prefix_len == plen &&
2553                     ipv6_addr_equal(pfx, &ifp->addr)) {
2554                         in6_ifa_hold(ifp);
2555                         read_unlock_bh(&idev->lock);
2556
2557                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2558                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2559                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2560                                                  jiffies);
2561                         ipv6_del_addr(ifp);
2562                         addrconf_verify_rtnl();
2563                         return 0;
2564                 }
2565         }
2566         read_unlock_bh(&idev->lock);
2567         return -EADDRNOTAVAIL;
2568 }
2569
2570
2571 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2572 {
2573         struct in6_ifreq ireq;
2574         int err;
2575
2576         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2577                 return -EPERM;
2578
2579         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2580                 return -EFAULT;
2581
2582         rtnl_lock();
2583         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2584                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2585                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2586         rtnl_unlock();
2587         return err;
2588 }
2589
2590 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2591 {
2592         struct in6_ifreq ireq;
2593         int err;
2594
2595         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2596                 return -EPERM;
2597
2598         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2599                 return -EFAULT;
2600
2601         rtnl_lock();
2602         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2603                              ireq.ifr6_prefixlen);
2604         rtnl_unlock();
2605         return err;
2606 }
2607
2608 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2609                      int plen, int scope)
2610 {
2611         struct inet6_ifaddr *ifp;
2612
2613         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2614                             scope, IFA_F_PERMANENT,
2615                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2616         if (!IS_ERR(ifp)) {
2617                 spin_lock_bh(&ifp->lock);
2618                 ifp->flags &= ~IFA_F_TENTATIVE;
2619                 spin_unlock_bh(&ifp->lock);
2620                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2621                 in6_ifa_put(ifp);
2622         }
2623 }
2624
2625 #if IS_ENABLED(CONFIG_IPV6_SIT)
2626 static void sit_add_v4_addrs(struct inet6_dev *idev)
2627 {
2628         struct in6_addr addr;
2629         struct net_device *dev;
2630         struct net *net = dev_net(idev->dev);
2631         int scope, plen;
2632         u32 pflags = 0;
2633
2634         ASSERT_RTNL();
2635
2636         memset(&addr, 0, sizeof(struct in6_addr));
2637         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2638
2639         if (idev->dev->flags&IFF_POINTOPOINT) {
2640                 addr.s6_addr32[0] = htonl(0xfe800000);
2641                 scope = IFA_LINK;
2642                 plen = 64;
2643         } else {
2644                 scope = IPV6_ADDR_COMPATv4;
2645                 plen = 96;
2646                 pflags |= RTF_NONEXTHOP;
2647         }
2648
2649         if (addr.s6_addr32[3]) {
2650                 add_addr(idev, &addr, plen, scope);
2651                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2652                 return;
2653         }
2654
2655         for_each_netdev(net, dev) {
2656                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2657                 if (in_dev && (dev->flags & IFF_UP)) {
2658                         struct in_ifaddr *ifa;
2659
2660                         int flag = scope;
2661
2662                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2663
2664                                 addr.s6_addr32[3] = ifa->ifa_local;
2665
2666                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2667                                         continue;
2668                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2669                                         if (idev->dev->flags&IFF_POINTOPOINT)
2670                                                 continue;
2671                                         flag |= IFA_HOST;
2672                                 }
2673
2674                                 add_addr(idev, &addr, plen, flag);
2675                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2676                                                       pflags);
2677                         }
2678                 }
2679         }
2680 }
2681 #endif
2682
2683 static void init_loopback(struct net_device *dev)
2684 {
2685         struct inet6_dev  *idev;
2686         struct net_device *sp_dev;
2687         struct inet6_ifaddr *sp_ifa;
2688         struct rt6_info *sp_rt;
2689
2690         /* ::1 */
2691
2692         ASSERT_RTNL();
2693
2694         idev = ipv6_find_idev(dev);
2695         if (idev == NULL) {
2696                 pr_debug("%s: add_dev failed\n", __func__);
2697                 return;
2698         }
2699
2700         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2701
2702         /* Add routes to other interface's IPv6 addresses */
2703         for_each_netdev(dev_net(dev), sp_dev) {
2704                 if (!strcmp(sp_dev->name, dev->name))
2705                         continue;
2706
2707                 idev = __in6_dev_get(sp_dev);
2708                 if (!idev)
2709                         continue;
2710
2711                 read_lock_bh(&idev->lock);
2712                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2713
2714                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2715                                 continue;
2716
2717                         if (sp_ifa->rt) {
2718                                 /* This dst has been added to garbage list when
2719                                  * lo device down, release this obsolete dst and
2720                                  * reallocate a new router for ifa.
2721                                  */
2722                                 if (sp_ifa->rt->dst.obsolete > 0) {
2723                                         ip6_rt_put(sp_ifa->rt);
2724                                         sp_ifa->rt = NULL;
2725                                 } else {
2726                                         continue;
2727                                 }
2728                         }
2729
2730                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2731
2732                         /* Failure cases are ignored */
2733                         if (!IS_ERR(sp_rt)) {
2734                                 sp_ifa->rt = sp_rt;
2735                                 ip6_ins_rt(sp_rt);
2736                         }
2737                 }
2738                 read_unlock_bh(&idev->lock);
2739         }
2740 }
2741
2742 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2743 {
2744         struct inet6_ifaddr *ifp;
2745         u32 addr_flags = IFA_F_PERMANENT;
2746
2747 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2748         if (idev->cnf.optimistic_dad &&
2749             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2750                 addr_flags |= IFA_F_OPTIMISTIC;
2751 #endif
2752
2753
2754         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2755                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2756         if (!IS_ERR(ifp)) {
2757                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2758                 addrconf_dad_start(ifp);
2759                 in6_ifa_put(ifp);
2760         }
2761 }
2762
2763 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2764 {
2765         if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2766                 struct in6_addr addr;
2767
2768                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2769                 /* addrconf_add_linklocal also adds a prefix_route and we
2770                  * only need to care about prefix routes if ipv6_generate_eui64
2771                  * couldn't generate one.
2772                  */
2773                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2774                         addrconf_add_linklocal(idev, &addr);
2775                 else if (prefix_route)
2776                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2777         }
2778 }
2779
2780 static void addrconf_dev_config(struct net_device *dev)
2781 {
2782         struct inet6_dev *idev;
2783
2784         ASSERT_RTNL();
2785
2786         if ((dev->type != ARPHRD_ETHER) &&
2787             (dev->type != ARPHRD_FDDI) &&
2788             (dev->type != ARPHRD_ARCNET) &&
2789             (dev->type != ARPHRD_INFINIBAND) &&
2790             (dev->type != ARPHRD_IEEE802154) &&
2791             (dev->type != ARPHRD_IEEE1394) &&
2792             (dev->type != ARPHRD_TUNNEL6) &&
2793             (dev->type != ARPHRD_6LOWPAN)) {
2794                 /* Alas, we support only Ethernet autoconfiguration. */
2795                 return;
2796         }
2797
2798         idev = addrconf_add_dev(dev);
2799         if (IS_ERR(idev))
2800                 return;
2801
2802         addrconf_addr_gen(idev, false);
2803 }
2804
2805 #if IS_ENABLED(CONFIG_IPV6_SIT)
2806 static void addrconf_sit_config(struct net_device *dev)
2807 {
2808         struct inet6_dev *idev;
2809
2810         ASSERT_RTNL();
2811
2812         /*
2813          * Configure the tunnel with one of our IPv4
2814          * addresses... we should configure all of
2815          * our v4 addrs in the tunnel
2816          */
2817
2818         idev = ipv6_find_idev(dev);
2819         if (idev == NULL) {
2820                 pr_debug("%s: add_dev failed\n", __func__);
2821                 return;
2822         }
2823
2824         if (dev->priv_flags & IFF_ISATAP) {
2825                 addrconf_addr_gen(idev, false);
2826                 return;
2827         }
2828
2829         sit_add_v4_addrs(idev);
2830
2831         if (dev->flags&IFF_POINTOPOINT)
2832                 addrconf_add_mroute(dev);
2833 }
2834 #endif
2835
2836 #if IS_ENABLED(CONFIG_NET_IPGRE)
2837 static void addrconf_gre_config(struct net_device *dev)
2838 {
2839         struct inet6_dev *idev;
2840
2841         ASSERT_RTNL();
2842
2843         idev = ipv6_find_idev(dev);
2844         if (idev == NULL) {
2845                 pr_debug("%s: add_dev failed\n", __func__);
2846                 return;
2847         }
2848
2849         addrconf_addr_gen(idev, true);
2850 }
2851 #endif
2852
2853 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2854                            void *ptr)
2855 {
2856         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2857         struct inet6_dev *idev = __in6_dev_get(dev);
2858         int run_pending = 0;
2859         int err;
2860
2861         switch (event) {
2862         case NETDEV_REGISTER:
2863                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2864                         idev = ipv6_add_dev(dev);
2865                         if (IS_ERR(idev))
2866                                 return notifier_from_errno(PTR_ERR(idev));
2867                 }
2868                 break;
2869
2870         case NETDEV_UP:
2871         case NETDEV_CHANGE:
2872                 if (dev->flags & IFF_SLAVE)
2873                         break;
2874
2875                 if (idev && idev->cnf.disable_ipv6)
2876                         break;
2877
2878                 if (event == NETDEV_UP) {
2879                         if (!addrconf_qdisc_ok(dev)) {
2880                                 /* device is not ready yet. */
2881                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2882                                         dev->name);
2883                                 break;
2884                         }
2885
2886                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2887                                 idev = ipv6_add_dev(dev);
2888
2889                         if (!IS_ERR_OR_NULL(idev)) {
2890                                 idev->if_flags |= IF_READY;
2891                                 run_pending = 1;
2892                         }
2893                 } else {
2894                         if (!addrconf_qdisc_ok(dev)) {
2895                                 /* device is still not ready. */
2896                                 break;
2897                         }
2898
2899                         if (idev) {
2900                                 if (idev->if_flags & IF_READY)
2901                                         /* device is already configured. */
2902                                         break;
2903                                 idev->if_flags |= IF_READY;
2904                         }
2905
2906                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2907                                 dev->name);
2908
2909                         run_pending = 1;
2910                 }
2911
2912                 switch (dev->type) {
2913 #if IS_ENABLED(CONFIG_IPV6_SIT)
2914                 case ARPHRD_SIT:
2915                         addrconf_sit_config(dev);
2916                         break;
2917 #endif
2918 #if IS_ENABLED(CONFIG_NET_IPGRE)
2919                 case ARPHRD_IPGRE:
2920                         addrconf_gre_config(dev);
2921                         break;
2922 #endif
2923                 case ARPHRD_LOOPBACK:
2924                         init_loopback(dev);
2925                         break;
2926
2927                 default:
2928                         addrconf_dev_config(dev);
2929                         break;
2930                 }
2931
2932                 if (!IS_ERR_OR_NULL(idev)) {
2933                         if (run_pending)
2934                                 addrconf_dad_run(idev);
2935
2936                         /*
2937                          * If the MTU changed during the interface down,
2938                          * when the interface up, the changed MTU must be
2939                          * reflected in the idev as well as routers.
2940                          */
2941                         if (idev->cnf.mtu6 != dev->mtu &&
2942                             dev->mtu >= IPV6_MIN_MTU) {
2943                                 rt6_mtu_change(dev, dev->mtu);
2944                                 idev->cnf.mtu6 = dev->mtu;
2945                         }
2946                         idev->tstamp = jiffies;
2947                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2948
2949                         /*
2950                          * If the changed mtu during down is lower than
2951                          * IPV6_MIN_MTU stop IPv6 on this interface.
2952                          */
2953                         if (dev->mtu < IPV6_MIN_MTU)
2954                                 addrconf_ifdown(dev, 1);
2955                 }
2956                 break;
2957
2958         case NETDEV_CHANGEMTU:
2959                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2960                         rt6_mtu_change(dev, dev->mtu);
2961                         idev->cnf.mtu6 = dev->mtu;
2962                         break;
2963                 }
2964
2965                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2966                         idev = ipv6_add_dev(dev);
2967                         if (!IS_ERR(idev))
2968                                 break;
2969                 }
2970
2971                 /*
2972                  * if MTU under IPV6_MIN_MTU.
2973                  * Stop IPv6 on this interface.
2974                  */
2975
2976         case NETDEV_DOWN:
2977         case NETDEV_UNREGISTER:
2978                 /*
2979                  *      Remove all addresses from this interface.
2980                  */
2981                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2982                 break;
2983
2984         case NETDEV_CHANGENAME:
2985                 if (idev) {
2986                         snmp6_unregister_dev(idev);
2987                         addrconf_sysctl_unregister(idev);
2988                         err = addrconf_sysctl_register(idev);
2989                         if (err)
2990                                 return notifier_from_errno(err);
2991                         err = snmp6_register_dev(idev);
2992                         if (err) {
2993                                 addrconf_sysctl_unregister(idev);
2994                                 return notifier_from_errno(err);
2995                         }
2996                 }
2997                 break;
2998
2999         case NETDEV_PRE_TYPE_CHANGE:
3000         case NETDEV_POST_TYPE_CHANGE:
3001                 addrconf_type_change(dev, event);
3002                 break;
3003         }
3004
3005         return NOTIFY_OK;
3006 }
3007
3008 /*
3009  *      addrconf module should be notified of a device going up
3010  */
3011 static struct notifier_block ipv6_dev_notf = {
3012         .notifier_call = addrconf_notify,
3013 };
3014
3015 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3016 {
3017         struct inet6_dev *idev;
3018         ASSERT_RTNL();
3019
3020         idev = __in6_dev_get(dev);
3021
3022         if (event == NETDEV_POST_TYPE_CHANGE)
3023                 ipv6_mc_remap(idev);
3024         else if (event == NETDEV_PRE_TYPE_CHANGE)
3025                 ipv6_mc_unmap(idev);
3026 }
3027
3028 static int addrconf_ifdown(struct net_device *dev, int how)
3029 {
3030         struct net *net = dev_net(dev);
3031         struct inet6_dev *idev;
3032         struct inet6_ifaddr *ifa;
3033         int state, i;
3034
3035         ASSERT_RTNL();
3036
3037         rt6_ifdown(net, dev);
3038         neigh_ifdown(&nd_tbl, dev);
3039
3040         idev = __in6_dev_get(dev);
3041         if (idev == NULL)
3042                 return -ENODEV;
3043
3044         /*
3045          * Step 1: remove reference to ipv6 device from parent device.
3046          *         Do not dev_put!
3047          */
3048         if (how) {
3049                 idev->dead = 1;
3050
3051                 /* protected by rtnl_lock */
3052                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3053
3054                 /* Step 1.5: remove snmp6 entry */
3055                 snmp6_unregister_dev(idev);
3056
3057         }
3058
3059         /* Step 2: clear hash table */
3060         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3061                 struct hlist_head *h = &inet6_addr_lst[i];
3062
3063                 spin_lock_bh(&addrconf_hash_lock);
3064 restart:
3065                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3066                         if (ifa->idev == idev) {
3067                                 hlist_del_init_rcu(&ifa->addr_lst);
3068                                 addrconf_del_dad_work(ifa);
3069                                 goto restart;
3070                         }
3071                 }
3072                 spin_unlock_bh(&addrconf_hash_lock);
3073         }
3074
3075         write_lock_bh(&idev->lock);
3076
3077         addrconf_del_rs_timer(idev);
3078
3079         /* Step 2: clear flags for stateless addrconf */
3080         if (!how)
3081                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3082
3083         if (how && del_timer(&idev->regen_timer))
3084                 in6_dev_put(idev);
3085
3086         /* Step 3: clear tempaddr list */
3087         while (!list_empty(&idev->tempaddr_list)) {
3088                 ifa = list_first_entry(&idev->tempaddr_list,
3089                                        struct inet6_ifaddr, tmp_list);
3090                 list_del(&ifa->tmp_list);
3091                 write_unlock_bh(&idev->lock);
3092                 spin_lock_bh(&ifa->lock);
3093
3094                 if (ifa->ifpub) {
3095                         in6_ifa_put(ifa->ifpub);
3096                         ifa->ifpub = NULL;
3097                 }
3098                 spin_unlock_bh(&ifa->lock);
3099                 in6_ifa_put(ifa);
3100                 write_lock_bh(&idev->lock);
3101         }
3102
3103         while (!list_empty(&idev->addr_list)) {
3104                 ifa = list_first_entry(&idev->addr_list,
3105                                        struct inet6_ifaddr, if_list);
3106                 addrconf_del_dad_work(ifa);
3107
3108                 list_del(&ifa->if_list);
3109
3110                 write_unlock_bh(&idev->lock);
3111
3112                 spin_lock_bh(&ifa->state_lock);
3113                 state = ifa->state;
3114                 ifa->state = INET6_IFADDR_STATE_DEAD;
3115                 spin_unlock_bh(&ifa->state_lock);
3116
3117                 if (state != INET6_IFADDR_STATE_DEAD) {
3118                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3119                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3120                 }
3121                 in6_ifa_put(ifa);
3122
3123                 write_lock_bh(&idev->lock);
3124         }
3125
3126         write_unlock_bh(&idev->lock);
3127
3128         /* Step 5: Discard anycast and multicast list */
3129         if (how) {
3130                 ipv6_ac_destroy_dev(idev);
3131                 ipv6_mc_destroy_dev(idev);
3132         } else {
3133                 ipv6_mc_down(idev);
3134         }
3135
3136         idev->tstamp = jiffies;
3137
3138         /* Last: Shot the device (if unregistered) */
3139         if (how) {
3140                 addrconf_sysctl_unregister(idev);
3141                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3142                 neigh_ifdown(&nd_tbl, dev);
3143                 in6_dev_put(idev);
3144         }
3145         return 0;
3146 }
3147
3148 static void addrconf_rs_timer(unsigned long data)
3149 {
3150         struct inet6_dev *idev = (struct inet6_dev *)data;
3151         struct net_device *dev = idev->dev;
3152         struct in6_addr lladdr;
3153
3154         write_lock(&idev->lock);
3155         if (idev->dead || !(idev->if_flags & IF_READY))
3156                 goto out;
3157
3158         if (!ipv6_accept_ra(idev))
3159                 goto out;
3160
3161         /* Announcement received after solicitation was sent */
3162         if (idev->if_flags & IF_RA_RCVD)
3163                 goto out;
3164
3165         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3166                 write_unlock(&idev->lock);
3167                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3168                         ndisc_send_rs(dev, &lladdr,
3169                                       &in6addr_linklocal_allrouters);
3170                 else
3171                         goto put;
3172
3173                 write_lock(&idev->lock);
3174                 /* The wait after the last probe can be shorter */
3175                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3176                                              idev->cnf.rtr_solicits) ?
3177                                       idev->cnf.rtr_solicit_delay :
3178                                       idev->cnf.rtr_solicit_interval);
3179         } else {
3180                 /*
3181                  * Note: we do not support deprecated "all on-link"
3182                  * assumption any longer.
3183                  */
3184                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3185         }
3186
3187 out:
3188         write_unlock(&idev->lock);
3189 put:
3190         in6_dev_put(idev);
3191 }
3192
3193 /*
3194  *      Duplicate Address Detection
3195  */
3196 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3197 {
3198         unsigned long rand_num;
3199         struct inet6_dev *idev = ifp->idev;
3200
3201         if (ifp->flags & IFA_F_OPTIMISTIC)
3202                 rand_num = 0;
3203         else
3204                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3205
3206         ifp->dad_probes = idev->cnf.dad_transmits;
3207         addrconf_mod_dad_work(ifp, rand_num);
3208 }
3209
3210 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3211 {
3212         struct inet6_dev *idev = ifp->idev;
3213         struct net_device *dev = idev->dev;
3214
3215         addrconf_join_solict(dev, &ifp->addr);
3216
3217         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3218
3219         read_lock_bh(&idev->lock);
3220         spin_lock(&ifp->lock);
3221         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3222                 goto out;
3223
3224         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3225             idev->cnf.accept_dad < 1 ||
3226             !(ifp->flags&IFA_F_TENTATIVE) ||
3227             ifp->flags & IFA_F_NODAD) {
3228                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3229                 spin_unlock(&ifp->lock);
3230                 read_unlock_bh(&idev->lock);
3231
3232                 addrconf_dad_completed(ifp);
3233                 return;
3234         }
3235
3236         if (!(idev->if_flags & IF_READY)) {
3237                 spin_unlock(&ifp->lock);
3238                 read_unlock_bh(&idev->lock);
3239                 /*
3240                  * If the device is not ready:
3241                  * - keep it tentative if it is a permanent address.
3242                  * - otherwise, kill it.
3243                  */
3244                 in6_ifa_hold(ifp);
3245                 addrconf_dad_stop(ifp, 0);
3246                 return;
3247         }
3248
3249         /*
3250          * Optimistic nodes can start receiving
3251          * Frames right away
3252          */
3253         if (ifp->flags & IFA_F_OPTIMISTIC) {
3254                 ip6_ins_rt(ifp->rt);
3255                 if (ipv6_use_optimistic_addr(idev)) {
3256                         /* Because optimistic nodes can use this address,
3257                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3258                          */
3259                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3260                 }
3261         }
3262
3263         addrconf_dad_kick(ifp);
3264 out:
3265         spin_unlock(&ifp->lock);
3266         read_unlock_bh(&idev->lock);
3267 }
3268
3269 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3270 {
3271         bool begin_dad = false;
3272
3273         spin_lock_bh(&ifp->state_lock);
3274         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3275                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3276                 begin_dad = true;
3277         }
3278         spin_unlock_bh(&ifp->state_lock);
3279
3280         if (begin_dad)
3281                 addrconf_mod_dad_work(ifp, 0);
3282 }
3283
3284 static void addrconf_dad_work(struct work_struct *w)
3285 {
3286         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3287                                                 struct inet6_ifaddr,
3288                                                 dad_work);
3289         struct inet6_dev *idev = ifp->idev;
3290         struct in6_addr mcaddr;
3291
3292         enum {
3293                 DAD_PROCESS,
3294                 DAD_BEGIN,
3295                 DAD_ABORT,
3296         } action = DAD_PROCESS;
3297
3298         rtnl_lock();
3299
3300         spin_lock_bh(&ifp->state_lock);
3301         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3302                 action = DAD_BEGIN;
3303                 ifp->state = INET6_IFADDR_STATE_DAD;
3304         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3305                 action = DAD_ABORT;
3306                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3307         }
3308         spin_unlock_bh(&ifp->state_lock);
3309
3310         if (action == DAD_BEGIN) {
3311                 addrconf_dad_begin(ifp);
3312                 goto out;
3313         } else if (action == DAD_ABORT) {
3314                 addrconf_dad_stop(ifp, 1);
3315                 goto out;
3316         }
3317
3318         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3319                 goto out;
3320
3321         write_lock_bh(&idev->lock);
3322         if (idev->dead || !(idev->if_flags & IF_READY)) {
3323                 write_unlock_bh(&idev->lock);
3324                 goto out;
3325         }
3326
3327         spin_lock(&ifp->lock);
3328         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3329                 spin_unlock(&ifp->lock);
3330                 write_unlock_bh(&idev->lock);
3331                 goto out;
3332         }
3333
3334         if (ifp->dad_probes == 0) {
3335                 /*
3336                  * DAD was successful
3337                  */
3338
3339                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3340                 spin_unlock(&ifp->lock);
3341                 write_unlock_bh(&idev->lock);
3342
3343                 addrconf_dad_completed(ifp);
3344
3345                 goto out;
3346         }
3347
3348         ifp->dad_probes--;
3349         addrconf_mod_dad_work(ifp,
3350                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3351         spin_unlock(&ifp->lock);
3352         write_unlock_bh(&idev->lock);
3353
3354         /* send a neighbour solicitation for our addr */
3355         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3356         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3357 out:
3358         in6_ifa_put(ifp);
3359         rtnl_unlock();
3360 }
3361
3362 /* ifp->idev must be at least read locked */
3363 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3364 {
3365         struct inet6_ifaddr *ifpiter;
3366         struct inet6_dev *idev = ifp->idev;
3367
3368         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3369                 if (ifpiter->scope > IFA_LINK)
3370                         break;
3371                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3372                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3373                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3374                     IFA_F_PERMANENT)
3375                         return false;
3376         }
3377         return true;
3378 }
3379
3380 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3381 {
3382         struct net_device *dev = ifp->idev->dev;
3383         struct in6_addr lladdr;
3384         bool send_rs, send_mld;
3385
3386         addrconf_del_dad_work(ifp);
3387
3388         /*
3389          *      Configure the address for reception. Now it is valid.
3390          */
3391
3392         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3393
3394         /* If added prefix is link local and we are prepared to process
3395            router advertisements, start sending router solicitations.
3396          */
3397
3398         read_lock_bh(&ifp->idev->lock);
3399         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3400         send_rs = send_mld &&
3401                   ipv6_accept_ra(ifp->idev) &&
3402                   ifp->idev->cnf.rtr_solicits > 0 &&
3403                   (dev->flags&IFF_LOOPBACK) == 0;
3404         read_unlock_bh(&ifp->idev->lock);
3405
3406         /* While dad is in progress mld report's source address is in6_addrany.
3407          * Resend with proper ll now.
3408          */
3409         if (send_mld)
3410                 ipv6_mc_dad_complete(ifp->idev);
3411
3412         if (send_rs) {
3413                 /*
3414                  *      If a host as already performed a random delay
3415                  *      [...] as part of DAD [...] there is no need
3416                  *      to delay again before sending the first RS
3417                  */
3418                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3419                         return;
3420                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3421
3422                 write_lock_bh(&ifp->idev->lock);
3423                 spin_lock(&ifp->lock);
3424                 ifp->idev->rs_probes = 1;
3425                 ifp->idev->if_flags |= IF_RS_SENT;
3426                 addrconf_mod_rs_timer(ifp->idev,
3427                                       ifp->idev->cnf.rtr_solicit_interval);
3428                 spin_unlock(&ifp->lock);
3429                 write_unlock_bh(&ifp->idev->lock);
3430         }
3431 }
3432
3433 static void addrconf_dad_run(struct inet6_dev *idev)
3434 {
3435         struct inet6_ifaddr *ifp;
3436
3437         read_lock_bh(&idev->lock);
3438         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3439                 spin_lock(&ifp->lock);
3440                 if (ifp->flags & IFA_F_TENTATIVE &&
3441                     ifp->state == INET6_IFADDR_STATE_DAD)
3442                         addrconf_dad_kick(ifp);
3443                 spin_unlock(&ifp->lock);
3444         }
3445         read_unlock_bh(&idev->lock);
3446 }
3447
3448 #ifdef CONFIG_PROC_FS
3449 struct if6_iter_state {
3450         struct seq_net_private p;
3451         int bucket;
3452         int offset;
3453 };
3454
3455 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3456 {
3457         struct inet6_ifaddr *ifa = NULL;
3458         struct if6_iter_state *state = seq->private;
3459         struct net *net = seq_file_net(seq);
3460         int p = 0;
3461
3462         /* initial bucket if pos is 0 */
3463         if (pos == 0) {
3464                 state->bucket = 0;
3465                 state->offset = 0;
3466         }
3467
3468         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3469                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3470                                          addr_lst) {
3471                         if (!net_eq(dev_net(ifa->idev->dev), net))
3472                                 continue;
3473                         /* sync with offset */
3474                         if (p < state->offset) {
3475                                 p++;
3476                                 continue;
3477                         }
3478                         state->offset++;
3479                         return ifa;
3480                 }
3481
3482                 /* prepare for next bucket */
3483                 state->offset = 0;
3484                 p = 0;
3485         }
3486         return NULL;
3487 }
3488
3489 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3490                                          struct inet6_ifaddr *ifa)
3491 {
3492         struct if6_iter_state *state = seq->private;
3493         struct net *net = seq_file_net(seq);
3494
3495         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3496                 if (!net_eq(dev_net(ifa->idev->dev), net))
3497                         continue;
3498                 state->offset++;
3499                 return ifa;
3500         }
3501
3502         while (++state->bucket < IN6_ADDR_HSIZE) {
3503                 state->offset = 0;
3504                 hlist_for_each_entry_rcu_bh(ifa,
3505                                      &inet6_addr_lst[state->bucket], addr_lst) {
3506                         if (!net_eq(dev_net(ifa->idev->dev), net))
3507                                 continue;
3508                         state->offset++;
3509                         return ifa;
3510                 }
3511         }
3512
3513         return NULL;
3514 }
3515
3516 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3517         __acquires(rcu_bh)
3518 {
3519         rcu_read_lock_bh();
3520         return if6_get_first(seq, *pos);
3521 }
3522
3523 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3524 {
3525         struct inet6_ifaddr *ifa;
3526
3527         ifa = if6_get_next(seq, v);
3528         ++*pos;
3529         return ifa;
3530 }
3531
3532 static void if6_seq_stop(struct seq_file *seq, void *v)
3533         __releases(rcu_bh)
3534 {
3535         rcu_read_unlock_bh();
3536 }
3537
3538 static int if6_seq_show(struct seq_file *seq, void *v)
3539 {
3540         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3541         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3542                    &ifp->addr,
3543                    ifp->idev->dev->ifindex,
3544                    ifp->prefix_len,
3545                    ifp->scope,
3546                    (u8) ifp->flags,
3547                    ifp->idev->dev->name);
3548         return 0;
3549 }
3550
3551 static const struct seq_operations if6_seq_ops = {
3552         .start  = if6_seq_start,
3553         .next   = if6_seq_next,
3554         .show   = if6_seq_show,
3555         .stop   = if6_seq_stop,
3556 };
3557
3558 static int if6_seq_open(struct inode *inode, struct file *file)
3559 {
3560         return seq_open_net(inode, file, &if6_seq_ops,
3561                             sizeof(struct if6_iter_state));
3562 }
3563
3564 static const struct file_operations if6_fops = {
3565         .owner          = THIS_MODULE,
3566         .open           = if6_seq_open,
3567         .read           = seq_read,
3568         .llseek         = seq_lseek,
3569         .release        = seq_release_net,
3570 };
3571
3572 static int __net_init if6_proc_net_init(struct net *net)
3573 {
3574         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3575                 return -ENOMEM;
3576         return 0;
3577 }
3578
3579 static void __net_exit if6_proc_net_exit(struct net *net)
3580 {
3581         remove_proc_entry("if_inet6", net->proc_net);
3582 }
3583
3584 static struct pernet_operations if6_proc_net_ops = {
3585         .init = if6_proc_net_init,
3586         .exit = if6_proc_net_exit,
3587 };
3588
3589 int __init if6_proc_init(void)
3590 {
3591         return register_pernet_subsys(&if6_proc_net_ops);
3592 }
3593
3594 void if6_proc_exit(void)
3595 {
3596         unregister_pernet_subsys(&if6_proc_net_ops);
3597 }
3598 #endif  /* CONFIG_PROC_FS */
3599
3600 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3601 /* Check if address is a home address configured on any interface. */
3602 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3603 {
3604         int ret = 0;
3605         struct inet6_ifaddr *ifp = NULL;
3606         unsigned int hash = inet6_addr_hash(addr);
3607
3608         rcu_read_lock_bh();
3609         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3610                 if (!net_eq(dev_net(ifp->idev->dev), net))
3611                         continue;
3612                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3613                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3614                         ret = 1;
3615                         break;
3616                 }
3617         }
3618         rcu_read_unlock_bh();
3619         return ret;
3620 }
3621 #endif
3622
3623 /*
3624  *      Periodic address status verification
3625  */
3626
3627 static void addrconf_verify_rtnl(void)
3628 {
3629         unsigned long now, next, next_sec, next_sched;
3630         struct inet6_ifaddr *ifp;
3631         int i;
3632
3633         ASSERT_RTNL();
3634
3635         rcu_read_lock_bh();
3636         now = jiffies;
3637         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3638
3639         cancel_delayed_work(&addr_chk_work);
3640
3641         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3642 restart:
3643                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3644                         unsigned long age;
3645
3646                         /* When setting preferred_lft to a value not zero or
3647                          * infinity, while valid_lft is infinity
3648                          * IFA_F_PERMANENT has a non-infinity life time.
3649                          */
3650                         if ((ifp->flags & IFA_F_PERMANENT) &&
3651                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
3652                                 continue;
3653
3654                         spin_lock(&ifp->lock);
3655                         /* We try to batch several events at once. */
3656                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3657
3658                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3659                             age >= ifp->valid_lft) {
3660                                 spin_unlock(&ifp->lock);
3661                                 in6_ifa_hold(ifp);
3662                                 ipv6_del_addr(ifp);
3663                                 goto restart;
3664                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3665                                 spin_unlock(&ifp->lock);
3666                                 continue;
3667                         } else if (age >= ifp->prefered_lft) {
3668                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3669                                 int deprecate = 0;
3670
3671                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3672                                         deprecate = 1;
3673                                         ifp->flags |= IFA_F_DEPRECATED;
3674                                 }
3675
3676                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3677                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3678                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3679
3680                                 spin_unlock(&ifp->lock);
3681
3682                                 if (deprecate) {
3683                                         in6_ifa_hold(ifp);
3684
3685                                         ipv6_ifa_notify(0, ifp);
3686                                         in6_ifa_put(ifp);
3687                                         goto restart;
3688                                 }
3689                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3690                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3691                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3692                                         ifp->idev->cnf.dad_transmits *
3693                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3694
3695                                 if (age >= ifp->prefered_lft - regen_advance) {
3696                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3697                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3698                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3699                                         if (!ifp->regen_count && ifpub) {
3700                                                 ifp->regen_count++;
3701                                                 in6_ifa_hold(ifp);
3702                                                 in6_ifa_hold(ifpub);
3703                                                 spin_unlock(&ifp->lock);
3704
3705                                                 spin_lock(&ifpub->lock);
3706                                                 ifpub->regen_count = 0;
3707                                                 spin_unlock(&ifpub->lock);
3708                                                 ipv6_create_tempaddr(ifpub, ifp);
3709                                                 in6_ifa_put(ifpub);
3710                                                 in6_ifa_put(ifp);
3711                                                 goto restart;
3712                                         }
3713                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3714                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3715                                 spin_unlock(&ifp->lock);
3716                         } else {
3717                                 /* ifp->prefered_lft <= ifp->valid_lft */
3718                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3719                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3720                                 spin_unlock(&ifp->lock);
3721                         }
3722                 }
3723         }
3724
3725         next_sec = round_jiffies_up(next);
3726         next_sched = next;
3727
3728         /* If rounded timeout is accurate enough, accept it. */
3729         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3730                 next_sched = next_sec;
3731
3732         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3733         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3734                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3735
3736         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3737               now, next, next_sec, next_sched);
3738         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3739         rcu_read_unlock_bh();
3740 }
3741
3742 static void addrconf_verify_work(struct work_struct *w)
3743 {
3744         rtnl_lock();
3745         addrconf_verify_rtnl();
3746         rtnl_unlock();
3747 }
3748
3749 static void addrconf_verify(void)
3750 {
3751         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3752 }
3753
3754 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3755                                      struct in6_addr **peer_pfx)
3756 {
3757         struct in6_addr *pfx = NULL;
3758
3759         *peer_pfx = NULL;
3760
3761         if (addr)
3762                 pfx = nla_data(addr);
3763
3764         if (local) {
3765                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3766                         *peer_pfx = pfx;
3767                 pfx = nla_data(local);
3768         }
3769
3770         return pfx;
3771 }
3772
3773 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3774         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3775         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3776         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3777         [IFA_FLAGS]             = { .len = sizeof(u32) },
3778 };
3779
3780 static int
3781 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3782 {
3783         struct net *net = sock_net(skb->sk);
3784         struct ifaddrmsg *ifm;
3785         struct nlattr *tb[IFA_MAX+1];
3786         struct in6_addr *pfx, *peer_pfx;
3787         u32 ifa_flags;
3788         int err;
3789
3790         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3791         if (err < 0)
3792                 return err;
3793
3794         ifm = nlmsg_data(nlh);
3795         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3796         if (pfx == NULL)
3797                 return -EINVAL;
3798
3799         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3800
3801         /* We ignore other flags so far. */
3802         ifa_flags &= IFA_F_MANAGETEMPADDR;
3803
3804         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3805                               ifm->ifa_prefixlen);
3806 }
3807
3808 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3809                              u32 prefered_lft, u32 valid_lft)
3810 {
3811         u32 flags;
3812         clock_t expires;
3813         unsigned long timeout;
3814         bool was_managetempaddr;
3815         bool had_prefixroute;
3816
3817         ASSERT_RTNL();
3818
3819         if (!valid_lft || (prefered_lft > valid_lft))
3820                 return -EINVAL;
3821
3822         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3823             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3824                 return -EINVAL;
3825
3826         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3827         if (addrconf_finite_timeout(timeout)) {
3828                 expires = jiffies_to_clock_t(timeout * HZ);
3829                 valid_lft = timeout;
3830                 flags = RTF_EXPIRES;
3831         } else {
3832                 expires = 0;
3833                 flags = 0;
3834                 ifa_flags |= IFA_F_PERMANENT;
3835         }
3836
3837         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3838         if (addrconf_finite_timeout(timeout)) {
3839                 if (timeout == 0)
3840                         ifa_flags |= IFA_F_DEPRECATED;
3841                 prefered_lft = timeout;
3842         }
3843
3844         spin_lock_bh(&ifp->lock);
3845         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3846         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3847                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
3848         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3849                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3850                         IFA_F_NOPREFIXROUTE);
3851         ifp->flags |= ifa_flags;
3852         ifp->tstamp = jiffies;
3853         ifp->valid_lft = valid_lft;
3854         ifp->prefered_lft = prefered_lft;
3855
3856         spin_unlock_bh(&ifp->lock);
3857         if (!(ifp->flags&IFA_F_TENTATIVE))
3858                 ipv6_ifa_notify(0, ifp);
3859
3860         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3861                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3862                                       expires, flags);
3863         } else if (had_prefixroute) {
3864                 enum cleanup_prefix_rt_t action;
3865                 unsigned long rt_expires;
3866
3867                 write_lock_bh(&ifp->idev->lock);
3868                 action = check_cleanup_prefix_route(ifp, &rt_expires);
3869                 write_unlock_bh(&ifp->idev->lock);
3870
3871                 if (action != CLEANUP_PREFIX_RT_NOP) {
3872                         cleanup_prefix_route(ifp, rt_expires,
3873                                 action == CLEANUP_PREFIX_RT_DEL);
3874                 }
3875         }
3876
3877         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3878                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3879                         valid_lft = prefered_lft = 0;
3880                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3881                                  !was_managetempaddr, jiffies);
3882         }
3883
3884         addrconf_verify_rtnl();
3885
3886         return 0;
3887 }
3888
3889 static int
3890 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3891 {
3892         struct net *net = sock_net(skb->sk);
3893         struct ifaddrmsg *ifm;
3894         struct nlattr *tb[IFA_MAX+1];
3895         struct in6_addr *pfx, *peer_pfx;
3896         struct inet6_ifaddr *ifa;
3897         struct net_device *dev;
3898         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3899         u32 ifa_flags;
3900         int err;
3901
3902         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3903         if (err < 0)
3904                 return err;
3905
3906         ifm = nlmsg_data(nlh);
3907         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3908         if (pfx == NULL)
3909                 return -EINVAL;
3910
3911         if (tb[IFA_CACHEINFO]) {
3912                 struct ifa_cacheinfo *ci;
3913
3914                 ci = nla_data(tb[IFA_CACHEINFO]);
3915                 valid_lft = ci->ifa_valid;
3916                 preferred_lft = ci->ifa_prefered;
3917         } else {
3918                 preferred_lft = INFINITY_LIFE_TIME;
3919                 valid_lft = INFINITY_LIFE_TIME;
3920         }
3921
3922         dev =  __dev_get_by_index(net, ifm->ifa_index);
3923         if (dev == NULL)
3924                 return -ENODEV;
3925
3926         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3927
3928         /* We ignore other flags so far. */
3929         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3930                      IFA_F_NOPREFIXROUTE;
3931
3932         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3933         if (ifa == NULL) {
3934                 /*
3935                  * It would be best to check for !NLM_F_CREATE here but
3936                  * userspace already relies on not having to provide this.
3937                  */
3938                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3939                                       ifm->ifa_prefixlen, ifa_flags,
3940                                       preferred_lft, valid_lft);
3941         }
3942
3943         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3944             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3945                 err = -EEXIST;
3946         else
3947                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3948
3949         in6_ifa_put(ifa);
3950
3951         return err;
3952 }
3953
3954 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3955                           u8 scope, int ifindex)
3956 {
3957         struct ifaddrmsg *ifm;
3958
3959         ifm = nlmsg_data(nlh);
3960         ifm->ifa_family = AF_INET6;
3961         ifm->ifa_prefixlen = prefixlen;
3962         ifm->ifa_flags = flags;
3963         ifm->ifa_scope = scope;
3964         ifm->ifa_index = ifindex;
3965 }
3966
3967 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3968                          unsigned long tstamp, u32 preferred, u32 valid)
3969 {
3970         struct ifa_cacheinfo ci;
3971
3972         ci.cstamp = cstamp_delta(cstamp);
3973         ci.tstamp = cstamp_delta(tstamp);
3974         ci.ifa_prefered = preferred;
3975         ci.ifa_valid = valid;
3976
3977         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3978 }
3979
3980 static inline int rt_scope(int ifa_scope)
3981 {
3982         if (ifa_scope & IFA_HOST)
3983                 return RT_SCOPE_HOST;
3984         else if (ifa_scope & IFA_LINK)
3985                 return RT_SCOPE_LINK;
3986         else if (ifa_scope & IFA_SITE)
3987                 return RT_SCOPE_SITE;
3988         else
3989                 return RT_SCOPE_UNIVERSE;
3990 }
3991
3992 static inline int inet6_ifaddr_msgsize(void)
3993 {
3994         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3995                + nla_total_size(16) /* IFA_LOCAL */
3996                + nla_total_size(16) /* IFA_ADDRESS */
3997                + nla_total_size(sizeof(struct ifa_cacheinfo))
3998                + nla_total_size(4)  /* IFA_FLAGS */;
3999 }
4000
4001 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4002                              u32 portid, u32 seq, int event, unsigned int flags)
4003 {
4004         struct nlmsghdr  *nlh;
4005         u32 preferred, valid;
4006
4007         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4008         if (nlh == NULL)
4009                 return -EMSGSIZE;
4010
4011         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4012                       ifa->idev->dev->ifindex);
4013
4014         if (!((ifa->flags&IFA_F_PERMANENT) &&
4015               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4016                 preferred = ifa->prefered_lft;
4017                 valid = ifa->valid_lft;
4018                 if (preferred != INFINITY_LIFE_TIME) {
4019                         long tval = (jiffies - ifa->tstamp)/HZ;
4020                         if (preferred > tval)
4021                                 preferred -= tval;
4022                         else
4023                                 preferred = 0;
4024                         if (valid != INFINITY_LIFE_TIME) {
4025                                 if (valid > tval)
4026                                         valid -= tval;
4027                                 else
4028                                         valid = 0;
4029                         }
4030                 }
4031         } else {
4032                 preferred = INFINITY_LIFE_TIME;
4033                 valid = INFINITY_LIFE_TIME;
4034         }
4035
4036         if (!ipv6_addr_any(&ifa->peer_addr)) {
4037                 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
4038                     nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
4039                         goto error;
4040         } else
4041                 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
4042                         goto error;
4043
4044         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4045                 goto error;
4046
4047         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4048                 goto error;
4049
4050         return nlmsg_end(skb, nlh);
4051
4052 error:
4053         nlmsg_cancel(skb, nlh);
4054         return -EMSGSIZE;
4055 }
4056
4057 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4058                                 u32 portid, u32 seq, int event, u16 flags)
4059 {
4060         struct nlmsghdr  *nlh;
4061         u8 scope = RT_SCOPE_UNIVERSE;
4062         int ifindex = ifmca->idev->dev->ifindex;
4063
4064         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4065                 scope = RT_SCOPE_SITE;
4066
4067         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4068         if (nlh == NULL)
4069                 return -EMSGSIZE;
4070
4071         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4072         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4073             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4074                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4075                 nlmsg_cancel(skb, nlh);
4076                 return -EMSGSIZE;
4077         }
4078
4079         return nlmsg_end(skb, nlh);
4080 }
4081
4082 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4083                                 u32 portid, u32 seq, int event, unsigned int flags)
4084 {
4085         struct nlmsghdr  *nlh;
4086         u8 scope = RT_SCOPE_UNIVERSE;
4087         int ifindex = ifaca->aca_idev->dev->ifindex;
4088
4089         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4090                 scope = RT_SCOPE_SITE;
4091
4092         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4093         if (nlh == NULL)
4094                 return -EMSGSIZE;
4095
4096         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4097         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4098             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4099                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4100                 nlmsg_cancel(skb, nlh);
4101                 return -EMSGSIZE;
4102         }
4103
4104         return nlmsg_end(skb, nlh);
4105 }
4106
4107 enum addr_type_t {
4108         UNICAST_ADDR,
4109         MULTICAST_ADDR,
4110         ANYCAST_ADDR,
4111 };
4112
4113 /* called with rcu_read_lock() */
4114 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4115                           struct netlink_callback *cb, enum addr_type_t type,
4116                           int s_ip_idx, int *p_ip_idx)
4117 {
4118         struct ifmcaddr6 *ifmca;
4119         struct ifacaddr6 *ifaca;
4120         int err = 1;
4121         int ip_idx = *p_ip_idx;
4122
4123         read_lock_bh(&idev->lock);
4124         switch (type) {
4125         case UNICAST_ADDR: {
4126                 struct inet6_ifaddr *ifa;
4127
4128                 /* unicast address incl. temp addr */
4129                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4130                         if (++ip_idx < s_ip_idx)
4131                                 continue;
4132                         err = inet6_fill_ifaddr(skb, ifa,
4133                                                 NETLINK_CB(cb->skb).portid,
4134                                                 cb->nlh->nlmsg_seq,
4135                                                 RTM_NEWADDR,
4136                                                 NLM_F_MULTI);
4137                         if (err <= 0)
4138                                 break;
4139                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4140                 }
4141                 break;
4142         }
4143         case MULTICAST_ADDR:
4144                 /* multicast address */
4145                 for (ifmca = idev->mc_list; ifmca;
4146                      ifmca = ifmca->next, ip_idx++) {
4147                         if (ip_idx < s_ip_idx)
4148                                 continue;
4149                         err = inet6_fill_ifmcaddr(skb, ifmca,
4150                                                   NETLINK_CB(cb->skb).portid,
4151                                                   cb->nlh->nlmsg_seq,
4152                                                   RTM_GETMULTICAST,
4153                                                   NLM_F_MULTI);
4154                         if (err <= 0)
4155                                 break;
4156                 }
4157                 break;
4158         case ANYCAST_ADDR:
4159                 /* anycast address */
4160                 for (ifaca = idev->ac_list; ifaca;
4161                      ifaca = ifaca->aca_next, ip_idx++) {
4162                         if (ip_idx < s_ip_idx)
4163                                 continue;
4164                         err = inet6_fill_ifacaddr(skb, ifaca,
4165                                                   NETLINK_CB(cb->skb).portid,
4166                                                   cb->nlh->nlmsg_seq,
4167                                                   RTM_GETANYCAST,
4168                                                   NLM_F_MULTI);
4169                         if (err <= 0)
4170                                 break;
4171                 }
4172                 break;
4173         default:
4174                 break;
4175         }
4176         read_unlock_bh(&idev->lock);
4177         *p_ip_idx = ip_idx;
4178         return err;
4179 }
4180
4181 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4182                            enum addr_type_t type)
4183 {
4184         struct net *net = sock_net(skb->sk);
4185         int h, s_h;
4186         int idx, ip_idx;
4187         int s_idx, s_ip_idx;
4188         struct net_device *dev;
4189         struct inet6_dev *idev;
4190         struct hlist_head *head;
4191
4192         s_h = cb->args[0];
4193         s_idx = idx = cb->args[1];
4194         s_ip_idx = ip_idx = cb->args[2];
4195
4196         rcu_read_lock();
4197         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4198         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4199                 idx = 0;
4200                 head = &net->dev_index_head[h];
4201                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4202                         if (idx < s_idx)
4203                                 goto cont;
4204                         if (h > s_h || idx > s_idx)
4205                                 s_ip_idx = 0;
4206                         ip_idx = 0;
4207                         idev = __in6_dev_get(dev);
4208                         if (!idev)
4209                                 goto cont;
4210
4211                         if (in6_dump_addrs(idev, skb, cb, type,
4212                                            s_ip_idx, &ip_idx) <= 0)
4213                                 goto done;
4214 cont:
4215                         idx++;
4216                 }
4217         }
4218 done:
4219         rcu_read_unlock();
4220         cb->args[0] = h;
4221         cb->args[1] = idx;
4222         cb->args[2] = ip_idx;
4223
4224         return skb->len;
4225 }
4226
4227 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4228 {
4229         enum addr_type_t type = UNICAST_ADDR;
4230
4231         return inet6_dump_addr(skb, cb, type);
4232 }
4233
4234 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4235 {
4236         enum addr_type_t type = MULTICAST_ADDR;
4237
4238         return inet6_dump_addr(skb, cb, type);
4239 }
4240
4241
4242 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4243 {
4244         enum addr_type_t type = ANYCAST_ADDR;
4245
4246         return inet6_dump_addr(skb, cb, type);
4247 }
4248
4249 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4250 {
4251         struct net *net = sock_net(in_skb->sk);
4252         struct ifaddrmsg *ifm;
4253         struct nlattr *tb[IFA_MAX+1];
4254         struct in6_addr *addr = NULL, *peer;
4255         struct net_device *dev = NULL;
4256         struct inet6_ifaddr *ifa;
4257         struct sk_buff *skb;
4258         int err;
4259
4260         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4261         if (err < 0)
4262                 goto errout;
4263
4264         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4265         if (addr == NULL) {
4266                 err = -EINVAL;
4267                 goto errout;
4268         }
4269
4270         ifm = nlmsg_data(nlh);
4271         if (ifm->ifa_index)
4272                 dev = __dev_get_by_index(net, ifm->ifa_index);
4273
4274         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4275         if (!ifa) {
4276                 err = -EADDRNOTAVAIL;
4277                 goto errout;
4278         }
4279
4280         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4281         if (!skb) {
4282                 err = -ENOBUFS;
4283                 goto errout_ifa;
4284         }
4285
4286         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4287                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4288         if (err < 0) {
4289                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4290                 WARN_ON(err == -EMSGSIZE);
4291                 kfree_skb(skb);
4292                 goto errout_ifa;
4293         }
4294         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4295 errout_ifa:
4296         in6_ifa_put(ifa);
4297 errout:
4298         return err;
4299 }
4300
4301 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4302 {
4303         struct sk_buff *skb;
4304         struct net *net = dev_net(ifa->idev->dev);
4305         int err = -ENOBUFS;
4306
4307         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4308         if (skb == NULL)
4309                 goto errout;
4310
4311         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4312         if (err < 0) {
4313                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4314                 WARN_ON(err == -EMSGSIZE);
4315                 kfree_skb(skb);
4316                 goto errout;
4317         }
4318         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4319         return;
4320 errout:
4321         if (err < 0)
4322                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4323 }
4324
4325 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4326                                 __s32 *array, int bytes)
4327 {
4328         BUG_ON(bytes < (DEVCONF_MAX * 4));
4329
4330         memset(array, 0, bytes);
4331         array[DEVCONF_FORWARDING] = cnf->forwarding;
4332         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4333         array[DEVCONF_MTU6] = cnf->mtu6;
4334         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4335         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4336         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4337         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4338         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4339         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4340                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4341         array[DEVCONF_RTR_SOLICIT_DELAY] =
4342                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4343         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4344         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4345                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4346         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4347                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4348         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4349         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4350         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4351         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4352         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4353         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4354         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4355         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4356 #ifdef CONFIG_IPV6_ROUTER_PREF
4357         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4358         array[DEVCONF_RTR_PROBE_INTERVAL] =
4359                 jiffies_to_msecs(cnf->rtr_probe_interval);
4360 #ifdef CONFIG_IPV6_ROUTE_INFO
4361         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4362 #endif
4363 #endif
4364         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4365         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4366 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4367         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4368         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4369 #endif
4370 #ifdef CONFIG_IPV6_MROUTE
4371         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4372 #endif
4373         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4374         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4375         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4376         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4377         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4378         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4379 }
4380
4381 static inline size_t inet6_ifla6_size(void)
4382 {
4383         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4384              + nla_total_size(sizeof(struct ifla_cacheinfo))
4385              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4386              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4387              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4388              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4389 }
4390
4391 static inline size_t inet6_if_nlmsg_size(void)
4392 {
4393         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4394                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4395                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4396                + nla_total_size(4) /* IFLA_MTU */
4397                + nla_total_size(4) /* IFLA_LINK */
4398                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4399 }
4400
4401 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4402                                       int items, int bytes)
4403 {
4404         int i;
4405         int pad = bytes - sizeof(u64) * items;
4406         BUG_ON(pad < 0);
4407
4408         /* Use put_unaligned() because stats may not be aligned for u64. */
4409         put_unaligned(items, &stats[0]);
4410         for (i = 1; i < items; i++)
4411                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4412
4413         memset(&stats[items], 0, pad);
4414 }
4415
4416 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4417                                       int items, int bytes, size_t syncpoff)
4418 {
4419         int i;
4420         int pad = bytes - sizeof(u64) * items;
4421         BUG_ON(pad < 0);
4422
4423         /* Use put_unaligned() because stats may not be aligned for u64. */
4424         put_unaligned(items, &stats[0]);
4425         for (i = 1; i < items; i++)
4426                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4427
4428         memset(&stats[items], 0, pad);
4429 }
4430
4431 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4432                              int bytes)
4433 {
4434         switch (attrtype) {
4435         case IFLA_INET6_STATS:
4436                 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4437                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4438                 break;
4439         case IFLA_INET6_ICMP6STATS:
4440                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4441                 break;
4442         }
4443 }
4444
4445 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4446 {
4447         struct nlattr *nla;
4448         struct ifla_cacheinfo ci;
4449
4450         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4451                 goto nla_put_failure;
4452         ci.max_reasm_len = IPV6_MAXPLEN;
4453         ci.tstamp = cstamp_delta(idev->tstamp);
4454         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4455         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4456         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4457                 goto nla_put_failure;
4458         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4459         if (nla == NULL)
4460                 goto nla_put_failure;
4461         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4462
4463         /* XXX - MC not implemented */
4464
4465         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4466         if (nla == NULL)
4467                 goto nla_put_failure;
4468         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4469
4470         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4471         if (nla == NULL)
4472                 goto nla_put_failure;
4473         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4474
4475         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4476         if (nla == NULL)
4477                 goto nla_put_failure;
4478
4479         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4480                 goto nla_put_failure;
4481
4482         read_lock_bh(&idev->lock);
4483         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4484         read_unlock_bh(&idev->lock);
4485
4486         return 0;
4487
4488 nla_put_failure:
4489         return -EMSGSIZE;
4490 }
4491
4492 static size_t inet6_get_link_af_size(const struct net_device *dev)
4493 {
4494         if (!__in6_dev_get(dev))
4495                 return 0;
4496
4497         return inet6_ifla6_size();
4498 }
4499
4500 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4501 {
4502         struct inet6_dev *idev = __in6_dev_get(dev);
4503
4504         if (!idev)
4505                 return -ENODATA;
4506
4507         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4508                 return -EMSGSIZE;
4509
4510         return 0;
4511 }
4512
4513 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4514 {
4515         struct inet6_ifaddr *ifp;
4516         struct net_device *dev = idev->dev;
4517         bool update_rs = false;
4518         struct in6_addr ll_addr;
4519
4520         ASSERT_RTNL();
4521
4522         if (token == NULL)
4523                 return -EINVAL;
4524         if (ipv6_addr_any(token))
4525                 return -EINVAL;
4526         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4527                 return -EINVAL;
4528         if (!ipv6_accept_ra(idev))
4529                 return -EINVAL;
4530         if (idev->cnf.rtr_solicits <= 0)
4531                 return -EINVAL;
4532
4533         write_lock_bh(&idev->lock);
4534
4535         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4536         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4537
4538         write_unlock_bh(&idev->lock);
4539
4540         if (!idev->dead && (idev->if_flags & IF_READY) &&
4541             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4542                              IFA_F_OPTIMISTIC)) {
4543
4544                 /* If we're not ready, then normal ifup will take care
4545                  * of this. Otherwise, we need to request our rs here.
4546                  */
4547                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4548                 update_rs = true;
4549         }
4550
4551         write_lock_bh(&idev->lock);
4552
4553         if (update_rs) {
4554                 idev->if_flags |= IF_RS_SENT;
4555                 idev->rs_probes = 1;
4556                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4557         }
4558
4559         /* Well, that's kinda nasty ... */
4560         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4561                 spin_lock(&ifp->lock);
4562                 if (ifp->tokenized) {
4563                         ifp->valid_lft = 0;
4564                         ifp->prefered_lft = 0;
4565                 }
4566                 spin_unlock(&ifp->lock);
4567         }
4568
4569         write_unlock_bh(&idev->lock);
4570         inet6_ifinfo_notify(RTM_NEWLINK, idev);
4571         addrconf_verify_rtnl();
4572         return 0;
4573 }
4574
4575 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4576 {
4577         int err = -EINVAL;
4578         struct inet6_dev *idev = __in6_dev_get(dev);
4579         struct nlattr *tb[IFLA_INET6_MAX + 1];
4580
4581         if (!idev)
4582                 return -EAFNOSUPPORT;
4583
4584         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4585                 BUG();
4586
4587         if (tb[IFLA_INET6_TOKEN]) {
4588                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4589                 if (err)
4590                         return err;
4591         }
4592
4593         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4594                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4595
4596                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4597                     mode != IN6_ADDR_GEN_MODE_NONE)
4598                         return -EINVAL;
4599                 idev->addr_gen_mode = mode;
4600                 err = 0;
4601         }
4602
4603         return err;
4604 }
4605
4606 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4607                              u32 portid, u32 seq, int event, unsigned int flags)
4608 {
4609         struct net_device *dev = idev->dev;
4610         struct ifinfomsg *hdr;
4611         struct nlmsghdr *nlh;
4612         void *protoinfo;
4613
4614         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4615         if (nlh == NULL)
4616                 return -EMSGSIZE;
4617
4618         hdr = nlmsg_data(nlh);
4619         hdr->ifi_family = AF_INET6;
4620         hdr->__ifi_pad = 0;
4621         hdr->ifi_type = dev->type;
4622         hdr->ifi_index = dev->ifindex;
4623         hdr->ifi_flags = dev_get_flags(dev);
4624         hdr->ifi_change = 0;
4625
4626         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4627             (dev->addr_len &&
4628              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4629             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4630             (dev->ifindex != dev->iflink &&
4631              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4632                 goto nla_put_failure;
4633         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4634         if (protoinfo == NULL)
4635                 goto nla_put_failure;
4636
4637         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4638                 goto nla_put_failure;
4639
4640         nla_nest_end(skb, protoinfo);
4641         return nlmsg_end(skb, nlh);
4642
4643 nla_put_failure:
4644         nlmsg_cancel(skb, nlh);
4645         return -EMSGSIZE;
4646 }
4647
4648 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4649 {
4650         struct net *net = sock_net(skb->sk);
4651         int h, s_h;
4652         int idx = 0, s_idx;
4653         struct net_device *dev;
4654         struct inet6_dev *idev;
4655         struct hlist_head *head;
4656
4657         s_h = cb->args[0];
4658         s_idx = cb->args[1];
4659
4660         rcu_read_lock();
4661         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4662                 idx = 0;
4663                 head = &net->dev_index_head[h];
4664                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4665                         if (idx < s_idx)
4666                                 goto cont;
4667                         idev = __in6_dev_get(dev);
4668                         if (!idev)
4669                                 goto cont;
4670                         if (inet6_fill_ifinfo(skb, idev,
4671                                               NETLINK_CB(cb->skb).portid,
4672                                               cb->nlh->nlmsg_seq,
4673                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4674                                 goto out;
4675 cont:
4676                         idx++;
4677                 }
4678         }
4679 out:
4680         rcu_read_unlock();
4681         cb->args[1] = idx;
4682         cb->args[0] = h;
4683
4684         return skb->len;
4685 }
4686
4687 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4688 {
4689         struct sk_buff *skb;
4690         struct net *net = dev_net(idev->dev);
4691         int err = -ENOBUFS;
4692
4693         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4694         if (skb == NULL)
4695                 goto errout;
4696
4697         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4698         if (err < 0) {
4699                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4700                 WARN_ON(err == -EMSGSIZE);
4701                 kfree_skb(skb);
4702                 goto errout;
4703         }
4704         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4705         return;
4706 errout:
4707         if (err < 0)
4708                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4709 }
4710
4711 static inline size_t inet6_prefix_nlmsg_size(void)
4712 {
4713         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4714                + nla_total_size(sizeof(struct in6_addr))
4715                + nla_total_size(sizeof(struct prefix_cacheinfo));
4716 }
4717
4718 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4719                              struct prefix_info *pinfo, u32 portid, u32 seq,
4720                              int event, unsigned int flags)
4721 {
4722         struct prefixmsg *pmsg;
4723         struct nlmsghdr *nlh;
4724         struct prefix_cacheinfo ci;
4725
4726         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4727         if (nlh == NULL)
4728                 return -EMSGSIZE;
4729
4730         pmsg = nlmsg_data(nlh);
4731         pmsg->prefix_family = AF_INET6;
4732         pmsg->prefix_pad1 = 0;
4733         pmsg->prefix_pad2 = 0;
4734         pmsg->prefix_ifindex = idev->dev->ifindex;
4735         pmsg->prefix_len = pinfo->prefix_len;
4736         pmsg->prefix_type = pinfo->type;
4737         pmsg->prefix_pad3 = 0;
4738         pmsg->prefix_flags = 0;
4739         if (pinfo->onlink)
4740                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4741         if (pinfo->autoconf)
4742                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4743
4744         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4745                 goto nla_put_failure;
4746         ci.preferred_time = ntohl(pinfo->prefered);
4747         ci.valid_time = ntohl(pinfo->valid);
4748         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4749                 goto nla_put_failure;
4750         return nlmsg_end(skb, nlh);
4751
4752 nla_put_failure:
4753         nlmsg_cancel(skb, nlh);
4754         return -EMSGSIZE;
4755 }
4756
4757 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4758                          struct prefix_info *pinfo)
4759 {
4760         struct sk_buff *skb;
4761         struct net *net = dev_net(idev->dev);
4762         int err = -ENOBUFS;
4763
4764         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4765         if (skb == NULL)
4766                 goto errout;
4767
4768         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4769         if (err < 0) {
4770                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4771                 WARN_ON(err == -EMSGSIZE);
4772                 kfree_skb(skb);
4773                 goto errout;
4774         }
4775         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4776         return;
4777 errout:
4778         if (err < 0)
4779                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4780 }
4781
4782 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4783 {
4784         struct net *net = dev_net(ifp->idev->dev);
4785
4786         if (event)
4787                 ASSERT_RTNL();
4788
4789         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4790
4791         switch (event) {
4792         case RTM_NEWADDR:
4793                 /*
4794                  * If the address was optimistic
4795                  * we inserted the route at the start of
4796                  * our DAD process, so we don't need
4797                  * to do it again
4798                  */
4799                 if (!(ifp->rt->rt6i_node))
4800                         ip6_ins_rt(ifp->rt);
4801                 if (ifp->idev->cnf.forwarding)
4802                         addrconf_join_anycast(ifp);
4803                 if (!ipv6_addr_any(&ifp->peer_addr))
4804                         addrconf_prefix_route(&ifp->peer_addr, 128,
4805                                               ifp->idev->dev, 0, 0);
4806                 break;
4807         case RTM_DELADDR:
4808                 if (ifp->idev->cnf.forwarding)
4809                         addrconf_leave_anycast(ifp);
4810                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4811                 if (!ipv6_addr_any(&ifp->peer_addr)) {
4812                         struct rt6_info *rt;
4813
4814                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
4815                                                        ifp->idev->dev, 0, 0);
4816                         if (rt && ip6_del_rt(rt))
4817                                 dst_free(&rt->dst);
4818                 }
4819                 dst_hold(&ifp->rt->dst);
4820
4821                 if (ip6_del_rt(ifp->rt))
4822                         dst_free(&ifp->rt->dst);
4823
4824                 rt_genid_bump_ipv6(net);
4825                 break;
4826         }
4827         atomic_inc(&net->ipv6.dev_addr_genid);
4828 }
4829
4830 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4831 {
4832         rcu_read_lock_bh();
4833         if (likely(ifp->idev->dead == 0))
4834                 __ipv6_ifa_notify(event, ifp);
4835         rcu_read_unlock_bh();
4836 }
4837
4838 #ifdef CONFIG_SYSCTL
4839
4840 static
4841 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4842                            void __user *buffer, size_t *lenp, loff_t *ppos)
4843 {
4844         int *valp = ctl->data;
4845         int val = *valp;
4846         loff_t pos = *ppos;
4847         struct ctl_table lctl;
4848         int ret;
4849
4850         /*
4851          * ctl->data points to idev->cnf.forwarding, we should
4852          * not modify it until we get the rtnl lock.
4853          */
4854         lctl = *ctl;
4855         lctl.data = &val;
4856
4857         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4858
4859         if (write)
4860                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4861         if (ret)
4862                 *ppos = pos;
4863         return ret;
4864 }
4865
4866 static void dev_disable_change(struct inet6_dev *idev)
4867 {
4868         struct netdev_notifier_info info;
4869
4870         if (!idev || !idev->dev)
4871                 return;
4872
4873         netdev_notifier_info_init(&info, idev->dev);
4874         if (idev->cnf.disable_ipv6)
4875                 addrconf_notify(NULL, NETDEV_DOWN, &info);
4876         else
4877                 addrconf_notify(NULL, NETDEV_UP, &info);
4878 }
4879
4880 static void addrconf_disable_change(struct net *net, __s32 newf)
4881 {
4882         struct net_device *dev;
4883         struct inet6_dev *idev;
4884
4885         rcu_read_lock();
4886         for_each_netdev_rcu(net, dev) {
4887                 idev = __in6_dev_get(dev);
4888                 if (idev) {
4889                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4890                         idev->cnf.disable_ipv6 = newf;
4891                         if (changed)
4892                                 dev_disable_change(idev);
4893                 }
4894         }
4895         rcu_read_unlock();
4896 }
4897
4898 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4899 {
4900         struct net *net;
4901         int old;
4902
4903         if (!rtnl_trylock())
4904                 return restart_syscall();
4905
4906         net = (struct net *)table->extra2;
4907         old = *p;
4908         *p = newf;
4909
4910         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4911                 rtnl_unlock();
4912                 return 0;
4913         }
4914
4915         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4916                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4917                 addrconf_disable_change(net, newf);
4918         } else if ((!newf) ^ (!old))
4919                 dev_disable_change((struct inet6_dev *)table->extra1);
4920
4921         rtnl_unlock();
4922         return 0;
4923 }
4924
4925 static
4926 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4927                             void __user *buffer, size_t *lenp, loff_t *ppos)
4928 {
4929         int *valp = ctl->data;
4930         int val = *valp;
4931         loff_t pos = *ppos;
4932         struct ctl_table lctl;
4933         int ret;
4934
4935         /*
4936          * ctl->data points to idev->cnf.disable_ipv6, we should
4937          * not modify it until we get the rtnl lock.
4938          */
4939         lctl = *ctl;
4940         lctl.data = &val;
4941
4942         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4943
4944         if (write)
4945                 ret = addrconf_disable_ipv6(ctl, valp, val);
4946         if (ret)
4947                 *ppos = pos;
4948         return ret;
4949 }
4950
4951 static
4952 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4953                               void __user *buffer, size_t *lenp, loff_t *ppos)
4954 {
4955         int *valp = ctl->data;
4956         int ret;
4957         int old, new;
4958
4959         old = *valp;
4960         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4961         new = *valp;
4962
4963         if (write && old != new) {
4964                 struct net *net = ctl->extra2;
4965
4966                 if (!rtnl_trylock())
4967                         return restart_syscall();
4968
4969                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4970                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4971                                                      NETCONFA_IFINDEX_DEFAULT,
4972                                                      net->ipv6.devconf_dflt);
4973                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4974                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4975                                                      NETCONFA_IFINDEX_ALL,
4976                                                      net->ipv6.devconf_all);
4977                 else {
4978                         struct inet6_dev *idev = ctl->extra1;
4979
4980                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4981                                                      idev->dev->ifindex,
4982                                                      &idev->cnf);
4983                 }
4984                 rtnl_unlock();
4985         }
4986
4987         return ret;
4988 }
4989
4990
4991 static struct addrconf_sysctl_table
4992 {
4993         struct ctl_table_header *sysctl_header;
4994         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4995 } addrconf_sysctl __read_mostly = {
4996         .sysctl_header = NULL,
4997         .addrconf_vars = {
4998                 {
4999                         .procname       = "forwarding",
5000                         .data           = &ipv6_devconf.forwarding,
5001                         .maxlen         = sizeof(int),
5002                         .mode           = 0644,
5003                         .proc_handler   = addrconf_sysctl_forward,
5004                 },
5005                 {
5006                         .procname       = "hop_limit",
5007                         .data           = &ipv6_devconf.hop_limit,
5008                         .maxlen         = sizeof(int),
5009                         .mode           = 0644,
5010                         .proc_handler   = proc_dointvec,
5011                 },
5012                 {
5013                         .procname       = "mtu",
5014                         .data           = &ipv6_devconf.mtu6,
5015                         .maxlen         = sizeof(int),
5016                         .mode           = 0644,
5017                         .proc_handler   = proc_dointvec,
5018                 },
5019                 {
5020                         .procname       = "accept_ra",
5021                         .data           = &ipv6_devconf.accept_ra,
5022                         .maxlen         = sizeof(int),
5023                         .mode           = 0644,
5024                         .proc_handler   = proc_dointvec,
5025                 },
5026                 {
5027                         .procname       = "accept_redirects",
5028                         .data           = &ipv6_devconf.accept_redirects,
5029                         .maxlen         = sizeof(int),
5030                         .mode           = 0644,
5031                         .proc_handler   = proc_dointvec,
5032                 },
5033                 {
5034                         .procname       = "autoconf",
5035                         .data           = &ipv6_devconf.autoconf,
5036                         .maxlen         = sizeof(int),
5037                         .mode           = 0644,
5038                         .proc_handler   = proc_dointvec,
5039                 },
5040                 {
5041                         .procname       = "dad_transmits",
5042                         .data           = &ipv6_devconf.dad_transmits,
5043                         .maxlen         = sizeof(int),
5044                         .mode           = 0644,
5045                         .proc_handler   = proc_dointvec,
5046                 },
5047                 {
5048                         .procname       = "router_solicitations",
5049                         .data           = &ipv6_devconf.rtr_solicits,
5050                         .maxlen         = sizeof(int),
5051                         .mode           = 0644,
5052                         .proc_handler   = proc_dointvec,
5053                 },
5054                 {
5055                         .procname       = "router_solicitation_interval",
5056                         .data           = &ipv6_devconf.rtr_solicit_interval,
5057                         .maxlen         = sizeof(int),
5058                         .mode           = 0644,
5059                         .proc_handler   = proc_dointvec_jiffies,
5060                 },
5061                 {
5062                         .procname       = "router_solicitation_delay",
5063                         .data           = &ipv6_devconf.rtr_solicit_delay,
5064                         .maxlen         = sizeof(int),
5065                         .mode           = 0644,
5066                         .proc_handler   = proc_dointvec_jiffies,
5067                 },
5068                 {
5069                         .procname       = "force_mld_version",
5070                         .data           = &ipv6_devconf.force_mld_version,
5071                         .maxlen         = sizeof(int),
5072                         .mode           = 0644,
5073                         .proc_handler   = proc_dointvec,
5074                 },
5075                 {
5076                         .procname       = "mldv1_unsolicited_report_interval",
5077                         .data           =
5078                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
5079                         .maxlen         = sizeof(int),
5080                         .mode           = 0644,
5081                         .proc_handler   = proc_dointvec_ms_jiffies,
5082                 },
5083                 {
5084                         .procname       = "mldv2_unsolicited_report_interval",
5085                         .data           =
5086                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
5087                         .maxlen         = sizeof(int),
5088                         .mode           = 0644,
5089                         .proc_handler   = proc_dointvec_ms_jiffies,
5090                 },
5091                 {
5092                         .procname       = "use_tempaddr",
5093                         .data           = &ipv6_devconf.use_tempaddr,
5094                         .maxlen         = sizeof(int),
5095                         .mode           = 0644,
5096                         .proc_handler   = proc_dointvec,
5097                 },
5098                 {
5099                         .procname       = "temp_valid_lft",
5100                         .data           = &ipv6_devconf.temp_valid_lft,
5101                         .maxlen         = sizeof(int),
5102                         .mode           = 0644,
5103                         .proc_handler   = proc_dointvec,
5104                 },
5105                 {
5106                         .procname       = "temp_prefered_lft",
5107                         .data           = &ipv6_devconf.temp_prefered_lft,
5108                         .maxlen         = sizeof(int),
5109                         .mode           = 0644,
5110                         .proc_handler   = proc_dointvec,
5111                 },
5112                 {
5113                         .procname       = "regen_max_retry",
5114                         .data           = &ipv6_devconf.regen_max_retry,
5115                         .maxlen         = sizeof(int),
5116                         .mode           = 0644,
5117                         .proc_handler   = proc_dointvec,
5118                 },
5119                 {
5120                         .procname       = "max_desync_factor",
5121                         .data           = &ipv6_devconf.max_desync_factor,
5122                         .maxlen         = sizeof(int),
5123                         .mode           = 0644,
5124                         .proc_handler   = proc_dointvec,
5125                 },
5126                 {
5127                         .procname       = "max_addresses",
5128                         .data           = &ipv6_devconf.max_addresses,
5129                         .maxlen         = sizeof(int),
5130                         .mode           = 0644,
5131                         .proc_handler   = proc_dointvec,
5132                 },
5133                 {
5134                         .procname       = "accept_ra_defrtr",
5135                         .data           = &ipv6_devconf.accept_ra_defrtr,
5136                         .maxlen         = sizeof(int),
5137                         .mode           = 0644,
5138                         .proc_handler   = proc_dointvec,
5139                 },
5140                 {
5141                         .procname       = "accept_ra_pinfo",
5142                         .data           = &ipv6_devconf.accept_ra_pinfo,
5143                         .maxlen         = sizeof(int),
5144                         .mode           = 0644,
5145                         .proc_handler   = proc_dointvec,
5146                 },
5147 #ifdef CONFIG_IPV6_ROUTER_PREF
5148                 {
5149                         .procname       = "accept_ra_rtr_pref",
5150                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
5151                         .maxlen         = sizeof(int),
5152                         .mode           = 0644,
5153                         .proc_handler   = proc_dointvec,
5154                 },
5155                 {
5156                         .procname       = "router_probe_interval",
5157                         .data           = &ipv6_devconf.rtr_probe_interval,
5158                         .maxlen         = sizeof(int),
5159                         .mode           = 0644,
5160                         .proc_handler   = proc_dointvec_jiffies,
5161                 },
5162 #ifdef CONFIG_IPV6_ROUTE_INFO
5163                 {
5164                         .procname       = "accept_ra_rt_info_max_plen",
5165                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5166                         .maxlen         = sizeof(int),
5167                         .mode           = 0644,
5168                         .proc_handler   = proc_dointvec,
5169                 },
5170 #endif
5171 #endif
5172                 {
5173                         .procname       = "proxy_ndp",
5174                         .data           = &ipv6_devconf.proxy_ndp,
5175                         .maxlen         = sizeof(int),
5176                         .mode           = 0644,
5177                         .proc_handler   = addrconf_sysctl_proxy_ndp,
5178                 },
5179                 {
5180                         .procname       = "accept_source_route",
5181                         .data           = &ipv6_devconf.accept_source_route,
5182                         .maxlen         = sizeof(int),
5183                         .mode           = 0644,
5184                         .proc_handler   = proc_dointvec,
5185                 },
5186 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5187                 {
5188                         .procname       = "optimistic_dad",
5189                         .data           = &ipv6_devconf.optimistic_dad,
5190                         .maxlen         = sizeof(int),
5191                         .mode           = 0644,
5192                         .proc_handler   = proc_dointvec,
5193
5194                 },
5195                 {
5196                         .procname       = "use_optimistic",
5197                         .data           = &ipv6_devconf.use_optimistic,
5198                         .maxlen         = sizeof(int),
5199                         .mode           = 0644,
5200                         .proc_handler   = proc_dointvec,
5201
5202                 },
5203 #endif
5204 #ifdef CONFIG_IPV6_MROUTE
5205                 {
5206                         .procname       = "mc_forwarding",
5207                         .data           = &ipv6_devconf.mc_forwarding,
5208                         .maxlen         = sizeof(int),
5209                         .mode           = 0444,
5210                         .proc_handler   = proc_dointvec,
5211                 },
5212 #endif
5213                 {
5214                         .procname       = "disable_ipv6",
5215                         .data           = &ipv6_devconf.disable_ipv6,
5216                         .maxlen         = sizeof(int),
5217                         .mode           = 0644,
5218                         .proc_handler   = addrconf_sysctl_disable,
5219                 },
5220                 {
5221                         .procname       = "accept_dad",
5222                         .data           = &ipv6_devconf.accept_dad,
5223                         .maxlen         = sizeof(int),
5224                         .mode           = 0644,
5225                         .proc_handler   = proc_dointvec,
5226                 },
5227                 {
5228                         .procname       = "force_tllao",
5229                         .data           = &ipv6_devconf.force_tllao,
5230                         .maxlen         = sizeof(int),
5231                         .mode           = 0644,
5232                         .proc_handler   = proc_dointvec
5233                 },
5234                 {
5235                         .procname       = "ndisc_notify",
5236                         .data           = &ipv6_devconf.ndisc_notify,
5237                         .maxlen         = sizeof(int),
5238                         .mode           = 0644,
5239                         .proc_handler   = proc_dointvec
5240                 },
5241                 {
5242                         .procname       = "suppress_frag_ndisc",
5243                         .data           = &ipv6_devconf.suppress_frag_ndisc,
5244                         .maxlen         = sizeof(int),
5245                         .mode           = 0644,
5246                         .proc_handler   = proc_dointvec
5247                 },
5248                 {
5249                         .procname       = "accept_ra_from_local",
5250                         .data           = &ipv6_devconf.accept_ra_from_local,
5251                         .maxlen         = sizeof(int),
5252                         .mode           = 0644,
5253                         .proc_handler   = proc_dointvec,
5254                 },
5255                 {
5256                         /* sentinel */
5257                 }
5258         },
5259 };
5260
5261 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5262                 struct inet6_dev *idev, struct ipv6_devconf *p)
5263 {
5264         int i;
5265         struct addrconf_sysctl_table *t;
5266         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5267
5268         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5269         if (t == NULL)
5270                 goto out;
5271
5272         for (i = 0; t->addrconf_vars[i].data; i++) {
5273                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5274                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5275                 t->addrconf_vars[i].extra2 = net;
5276         }
5277
5278         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5279
5280         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5281         if (t->sysctl_header == NULL)
5282                 goto free;
5283
5284         p->sysctl = t;
5285         return 0;
5286
5287 free:
5288         kfree(t);
5289 out:
5290         return -ENOBUFS;
5291 }
5292
5293 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5294 {
5295         struct addrconf_sysctl_table *t;
5296
5297         if (p->sysctl == NULL)
5298                 return;
5299
5300         t = p->sysctl;
5301         p->sysctl = NULL;
5302         unregister_net_sysctl_table(t->sysctl_header);
5303         kfree(t);
5304 }
5305
5306 static int addrconf_sysctl_register(struct inet6_dev *idev)
5307 {
5308         int err;
5309
5310         if (!sysctl_dev_name_is_allowed(idev->dev->name))
5311                 return -EINVAL;
5312
5313         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5314                                     &ndisc_ifinfo_sysctl_change);
5315         if (err)
5316                 return err;
5317         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5318                                          idev, &idev->cnf);
5319         if (err)
5320                 neigh_sysctl_unregister(idev->nd_parms);
5321
5322         return err;
5323 }
5324
5325 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5326 {
5327         __addrconf_sysctl_unregister(&idev->cnf);
5328         neigh_sysctl_unregister(idev->nd_parms);
5329 }
5330
5331
5332 #endif
5333
5334 static int __net_init addrconf_init_net(struct net *net)
5335 {
5336         int err = -ENOMEM;
5337         struct ipv6_devconf *all, *dflt;
5338
5339         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5340         if (all == NULL)
5341                 goto err_alloc_all;
5342
5343         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5344         if (dflt == NULL)
5345                 goto err_alloc_dflt;
5346
5347         /* these will be inherited by all namespaces */
5348         dflt->autoconf = ipv6_defaults.autoconf;
5349         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5350
5351         net->ipv6.devconf_all = all;
5352         net->ipv6.devconf_dflt = dflt;
5353
5354 #ifdef CONFIG_SYSCTL
5355         err = __addrconf_sysctl_register(net, "all", NULL, all);
5356         if (err < 0)
5357                 goto err_reg_all;
5358
5359         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5360         if (err < 0)
5361                 goto err_reg_dflt;
5362 #endif
5363         return 0;
5364
5365 #ifdef CONFIG_SYSCTL
5366 err_reg_dflt:
5367         __addrconf_sysctl_unregister(all);
5368 err_reg_all:
5369         kfree(dflt);
5370 #endif
5371 err_alloc_dflt:
5372         kfree(all);
5373 err_alloc_all:
5374         return err;
5375 }
5376
5377 static void __net_exit addrconf_exit_net(struct net *net)
5378 {
5379 #ifdef CONFIG_SYSCTL
5380         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5381         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5382 #endif
5383         kfree(net->ipv6.devconf_dflt);
5384         kfree(net->ipv6.devconf_all);
5385 }
5386
5387 static struct pernet_operations addrconf_ops = {
5388         .init = addrconf_init_net,
5389         .exit = addrconf_exit_net,
5390 };
5391
5392 static struct rtnl_af_ops inet6_ops = {
5393         .family           = AF_INET6,
5394         .fill_link_af     = inet6_fill_link_af,
5395         .get_link_af_size = inet6_get_link_af_size,
5396         .set_link_af      = inet6_set_link_af,
5397 };
5398
5399 /*
5400  *      Init / cleanup code
5401  */
5402
5403 int __init addrconf_init(void)
5404 {
5405         struct inet6_dev *idev;
5406         int i, err;
5407
5408         err = ipv6_addr_label_init();
5409         if (err < 0) {
5410                 pr_crit("%s: cannot initialize default policy table: %d\n",
5411                         __func__, err);
5412                 goto out;
5413         }
5414
5415         err = register_pernet_subsys(&addrconf_ops);
5416         if (err < 0)
5417                 goto out_addrlabel;
5418
5419         addrconf_wq = create_workqueue("ipv6_addrconf");
5420         if (!addrconf_wq) {
5421                 err = -ENOMEM;
5422                 goto out_nowq;
5423         }
5424
5425         /* The addrconf netdev notifier requires that loopback_dev
5426          * has it's ipv6 private information allocated and setup
5427          * before it can bring up and give link-local addresses
5428          * to other devices which are up.
5429          *
5430          * Unfortunately, loopback_dev is not necessarily the first
5431          * entry in the global dev_base list of net devices.  In fact,
5432          * it is likely to be the very last entry on that list.
5433          * So this causes the notifier registry below to try and
5434          * give link-local addresses to all devices besides loopback_dev
5435          * first, then loopback_dev, which cases all the non-loopback_dev
5436          * devices to fail to get a link-local address.
5437          *
5438          * So, as a temporary fix, allocate the ipv6 structure for
5439          * loopback_dev first by hand.
5440          * Longer term, all of the dependencies ipv6 has upon the loopback
5441          * device and it being up should be removed.
5442          */
5443         rtnl_lock();
5444         idev = ipv6_add_dev(init_net.loopback_dev);
5445         rtnl_unlock();
5446         if (IS_ERR(idev)) {
5447                 err = PTR_ERR(idev);
5448                 goto errlo;
5449         }
5450
5451         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5452                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5453
5454         register_netdevice_notifier(&ipv6_dev_notf);
5455
5456         addrconf_verify();
5457
5458         rtnl_af_register(&inet6_ops);
5459
5460         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5461                               NULL);
5462         if (err < 0)
5463                 goto errout;
5464
5465         /* Only the first call to __rtnl_register can fail */
5466         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5467         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5468         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5469                         inet6_dump_ifaddr, NULL);
5470         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5471                         inet6_dump_ifmcaddr, NULL);
5472         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5473                         inet6_dump_ifacaddr, NULL);
5474         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5475                         inet6_netconf_dump_devconf, NULL);
5476
5477         ipv6_addr_label_rtnl_register();
5478
5479         return 0;
5480 errout:
5481         rtnl_af_unregister(&inet6_ops);
5482         unregister_netdevice_notifier(&ipv6_dev_notf);
5483 errlo:
5484         destroy_workqueue(addrconf_wq);
5485 out_nowq:
5486         unregister_pernet_subsys(&addrconf_ops);
5487 out_addrlabel:
5488         ipv6_addr_label_cleanup();
5489 out:
5490         return err;
5491 }
5492
5493 void addrconf_cleanup(void)
5494 {
5495         struct net_device *dev;
5496         int i;
5497
5498         unregister_netdevice_notifier(&ipv6_dev_notf);
5499         unregister_pernet_subsys(&addrconf_ops);
5500         ipv6_addr_label_cleanup();
5501
5502         rtnl_lock();
5503
5504         __rtnl_af_unregister(&inet6_ops);
5505
5506         /* clean dev list */
5507         for_each_netdev(&init_net, dev) {
5508                 if (__in6_dev_get(dev) == NULL)
5509                         continue;
5510                 addrconf_ifdown(dev, 1);
5511         }
5512         addrconf_ifdown(init_net.loopback_dev, 2);
5513
5514         /*
5515          *      Check hash table.
5516          */
5517         spin_lock_bh(&addrconf_hash_lock);
5518         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5519                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5520         spin_unlock_bh(&addrconf_hash_lock);
5521         cancel_delayed_work(&addr_chk_work);
5522         rtnl_unlock();
5523
5524         destroy_workqueue(addrconf_wq);
5525 }