net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #define pr_fmt(fmt) "IPv6: " fmt
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/kernel.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/net.h>
  49 #include <linux/in6.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/if_addr.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #include <linux/slab.h>
  59 #ifdef CONFIG_SYSCTL
  60 #include <linux/sysctl.h>
  61 #endif
  62 #include <linux/capability.h>
  63 #include <linux/delay.h>
  64 #include <linux/notifier.h>
  65 #include <linux/string.h>
  66 #include <linux/hash.h>
  67
  68 #include <net/net_namespace.h>
  69 #include <net/sock.h>
  70 #include <net/snmp.h>
  71
  72 #include <net/af_ieee802154.h>
  73 #include <net/firewire.h>
  74 #include <net/ipv6.h>
  75 #include <net/protocol.h>
  76 #include <net/ndisc.h>
  77 #include <net/ip6_route.h>
  78 #include <net/addrconf.h>
  79 #include <net/tcp.h>
  80 #include <net/ip.h>
  81 #include <net/netlink.h>
  82 #include <net/pkt_sched.h>
  83 #include <linux/if_tunnel.h>
  84 #include <linux/rtnetlink.h>
  85 #include <linux/netconf.h>
  86 #include <linux/random.h>
  87 #include <linux/uaccess.h>
  88 #include <asm/unaligned.h>
  89
  90 #include <linux/proc_fs.h>
  91 #include <linux/seq_file.h>
  92 #include <linux/export.h>
  93
  94 /* Set to 3 to get tracing... */
  95 #define ACONF_DEBUG 2
  96
  97 #if ACONF_DEBUG >= 3
  98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
  99 #else
 100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 101 #endif
 102
 103 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 104
 105 static inline u32 cstamp_delta(unsigned long cstamp)
 106 {
 107         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 108 }
 109
 110 #ifdef CONFIG_SYSCTL
 111 static void addrconf_sysctl_register(struct inet6_dev *idev);
 112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 113 #else
 114 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 115 {
 116 }
 117
 118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 119 {
 120 }
 121 #endif
 122
 123 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 125 static void ipv6_regen_rndid(unsigned long data);
 126
 127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 128 static int ipv6_count_addresses(struct inet6_dev *idev);
 129
 130 /*
 131  *      Configured unicast address hash table
 132  */
 133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 134 static DEFINE_SPINLOCK(addrconf_hash_lock);
 135
 136 static void addrconf_verify(unsigned long);
 137
 138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 139 static DEFINE_SPINLOCK(addrconf_verify_lock);
 140
 141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 143
 144 static void addrconf_type_change(struct net_device *dev,
 145                                  unsigned long event);
 146 static int addrconf_ifdown(struct net_device *dev, int how);
 147
 148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 149                                                   int plen,
 150                                                   const struct net_device *dev,
 151                                                   u32 flags, u32 noflags);
 152
 153 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 154 static void addrconf_dad_timer(unsigned long data);
 155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 156 static void addrconf_dad_run(struct inet6_dev *idev);
 157 static void addrconf_rs_timer(unsigned long data);
 158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 160
 161 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 162                                 struct prefix_info *pinfo);
 163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 164                                struct net_device *dev);
 165
 166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 167         .forwarding             = 0,
 168         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 169         .mtu6                   = IPV6_MIN_MTU,
 170         .accept_ra              = 1,
 171         .accept_redirects       = 1,
 172         .autoconf               = 1,
 173         .force_mld_version      = 0,
 174         .mldv1_unsolicited_report_interval = 10 * HZ,
 175         .mldv2_unsolicited_report_interval = HZ,
 176         .dad_transmits          = 1,
 177         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 178         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 179         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 180         .use_tempaddr           = 0,
 181         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 182         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 183         .regen_max_retry        = REGEN_MAX_RETRY,
 184         .max_desync_factor      = MAX_DESYNC_FACTOR,
 185         .max_addresses          = IPV6_MAX_ADDRESSES,
 186         .accept_ra_defrtr       = 1,
 187         .accept_ra_pinfo        = 1,
 188 #ifdef CONFIG_IPV6_ROUTER_PREF
 189         .accept_ra_rtr_pref     = 1,
 190         .rtr_probe_interval     = 60 * HZ,
 191 #ifdef CONFIG_IPV6_ROUTE_INFO
 192         .accept_ra_rt_info_max_plen = 0,
 193 #endif
 194 #endif
 195         .proxy_ndp              = 0,
 196         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 197         .disable_ipv6           = 0,
 198         .accept_dad             = 1,
 199         .suppress_frag_ndisc    = 1,
 200 };
 201
 202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 203         .forwarding             = 0,
 204         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 205         .mtu6                   = IPV6_MIN_MTU,
 206         .accept_ra              = 1,
 207         .accept_redirects       = 1,
 208         .autoconf               = 1,
 209         .force_mld_version      = 0,
 210         .mldv1_unsolicited_report_interval = 10 * HZ,
 211         .mldv2_unsolicited_report_interval = HZ,
 212         .dad_transmits          = 1,
 213         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 214         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 215         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 216         .use_tempaddr           = 0,
 217         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 218         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 219         .regen_max_retry        = REGEN_MAX_RETRY,
 220         .max_desync_factor      = MAX_DESYNC_FACTOR,
 221         .max_addresses          = IPV6_MAX_ADDRESSES,
 222         .accept_ra_defrtr       = 1,
 223         .accept_ra_pinfo        = 1,
 224 #ifdef CONFIG_IPV6_ROUTER_PREF
 225         .accept_ra_rtr_pref     = 1,
 226         .rtr_probe_interval     = 60 * HZ,
 227 #ifdef CONFIG_IPV6_ROUTE_INFO
 228         .accept_ra_rt_info_max_plen = 0,
 229 #endif
 230 #endif
 231         .proxy_ndp              = 0,
 232         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 233         .disable_ipv6           = 0,
 234         .accept_dad             = 1,
 235         .suppress_frag_ndisc    = 1,
 236 };
 237
 238 /* Check if a valid qdisc is available */
 239 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 240 {
 241         return !qdisc_tx_is_noop(dev);
 242 }
 243
 244 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 245 {
 246         if (del_timer(&idev->rs_timer))
 247                 __in6_dev_put(idev);
 248 }
 249
 250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
 251 {
 252         if (del_timer(&ifp->dad_timer))
 253                 __in6_ifa_put(ifp);
 254 }
 255
 256 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 257                                   unsigned long when)
 258 {
 259         if (!timer_pending(&idev->rs_timer))
 260                 in6_dev_hold(idev);
 261         mod_timer(&idev->rs_timer, jiffies + when);
 262 }
 263
 264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
 265                                    unsigned long when)
 266 {
 267         if (!timer_pending(&ifp->dad_timer))
 268                 in6_ifa_hold(ifp);
 269         mod_timer(&ifp->dad_timer, jiffies + when);
 270 }
 271
 272 static int snmp6_alloc_dev(struct inet6_dev *idev)
 273 {
 274         int i;
 275
 276         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 277                           sizeof(struct ipstats_mib),
 278                           __alignof__(struct ipstats_mib)) < 0)
 279                 goto err_ip;
 280
 281         for_each_possible_cpu(i) {
 282                 struct ipstats_mib *addrconf_stats;
 283                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
 284                 u64_stats_init(&addrconf_stats->syncp);
 285 #if SNMP_ARRAY_SZ == 2
 286                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
 287                 u64_stats_init(&addrconf_stats->syncp);
 288 #endif
 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         snmp_mib_free((void __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
 315         ASSERT_RTNL();
 316
 317         if (dev->mtu < IPV6_MIN_MTU)
 318                 return NULL;
 319
 320         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 321
 322         if (ndev == NULL)
 323                 return NULL;
 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 NULL;
 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 NULL;
 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                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 358                 ndev->dead = 1;
 359                 in6_dev_finish_destroy(ndev);
 360                 return NULL;
 361         }
 362
 363         /* One reference from device.  We must do this before
 364          * we invoke __ipv6_regen_rndid().
 365          */
 366         in6_dev_hold(ndev);
 367
 368         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 369                 ndev->cnf.accept_dad = -1;
 370
 371 #if IS_ENABLED(CONFIG_IPV6_SIT)
 372         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 373                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 374                 ndev->cnf.rtr_solicits = 0;
 375         }
 376 #endif
 377
 378         INIT_LIST_HEAD(&ndev->tempaddr_list);
 379         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 380         if ((dev->flags&IFF_LOOPBACK) ||
 381             dev->type == ARPHRD_TUNNEL ||
 382             dev->type == ARPHRD_TUNNEL6 ||
 383             dev->type == ARPHRD_SIT ||
 384             dev->type == ARPHRD_NONE) {
 385                 ndev->cnf.use_tempaddr = -1;
 386         } else {
 387                 in6_dev_hold(ndev);
 388                 ipv6_regen_rndid((unsigned long) ndev);
 389         }
 390
 391         ndev->token = in6addr_any;
 392
 393         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 394                 ndev->if_flags |= IF_READY;
 395
 396         ipv6_mc_init_dev(ndev);
 397         ndev->tstamp = jiffies;
 398         addrconf_sysctl_register(ndev);
 399         /* protected by rtnl_lock */
 400         rcu_assign_pointer(dev->ip6_ptr, ndev);
 401
 402         /* Join interface-local all-node multicast group */
 403         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 404
 405         /* Join all-node multicast group */
 406         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 407
 408         /* Join all-router multicast group if forwarding is set */
 409         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 410                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 411
 412         return ndev;
 413 }
 414
 415 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 416 {
 417         struct inet6_dev *idev;
 418
 419         ASSERT_RTNL();
 420
 421         idev = __in6_dev_get(dev);
 422         if (!idev) {
 423                 idev = ipv6_add_dev(dev);
 424                 if (!idev)
 425                         return NULL;
 426         }
 427
 428         if (dev->flags&IFF_UP)
 429                 ipv6_mc_up(idev);
 430         return idev;
 431 }
 432
 433 static int inet6_netconf_msgsize_devconf(int type)
 434 {
 435         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 436                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 437
 438         /* type -1 is used for ALL */
 439         if (type == -1 || type == NETCONFA_FORWARDING)
 440                 size += nla_total_size(4);
 441 #ifdef CONFIG_IPV6_MROUTE
 442         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 443                 size += nla_total_size(4);
 444 #endif
 445
 446         return size;
 447 }
 448
 449 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 450                                       struct ipv6_devconf *devconf, u32 portid,
 451                                       u32 seq, int event, unsigned int flags,
 452                                       int type)
 453 {
 454         struct nlmsghdr  *nlh;
 455         struct netconfmsg *ncm;
 456
 457         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 458                         flags);
 459         if (nlh == NULL)
 460                 return -EMSGSIZE;
 461
 462         ncm = nlmsg_data(nlh);
 463         ncm->ncm_family = AF_INET6;
 464
 465         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 466                 goto nla_put_failure;
 467
 468         /* type -1 is used for ALL */
 469         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 470             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 471                 goto nla_put_failure;
 472 #ifdef CONFIG_IPV6_MROUTE
 473         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 474             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 475                         devconf->mc_forwarding) < 0)
 476                 goto nla_put_failure;
 477 #endif
 478         return nlmsg_end(skb, nlh);
 479
 480 nla_put_failure:
 481         nlmsg_cancel(skb, nlh);
 482         return -EMSGSIZE;
 483 }
 484
 485 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 486                                   struct ipv6_devconf *devconf)
 487 {
 488         struct sk_buff *skb;
 489         int err = -ENOBUFS;
 490
 491         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 492         if (skb == NULL)
 493                 goto errout;
 494
 495         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 496                                          RTM_NEWNETCONF, 0, type);
 497         if (err < 0) {
 498                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 499                 WARN_ON(err == -EMSGSIZE);
 500                 kfree_skb(skb);
 501                 goto errout;
 502         }
 503         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 504         return;
 505 errout:
 506         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 507 }
 508
 509 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 510         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 511         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 512 };
 513
 514 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 515                                      struct nlmsghdr *nlh)
 516 {
 517         struct net *net = sock_net(in_skb->sk);
 518         struct nlattr *tb[NETCONFA_MAX+1];
 519         struct netconfmsg *ncm;
 520         struct sk_buff *skb;
 521         struct ipv6_devconf *devconf;
 522         struct inet6_dev *in6_dev;
 523         struct net_device *dev;
 524         int ifindex;
 525         int err;
 526
 527         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 528                           devconf_ipv6_policy);
 529         if (err < 0)
 530                 goto errout;
 531
 532         err = EINVAL;
 533         if (!tb[NETCONFA_IFINDEX])
 534                 goto errout;
 535
 536         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 537         switch (ifindex) {
 538         case NETCONFA_IFINDEX_ALL:
 539                 devconf = net->ipv6.devconf_all;
 540                 break;
 541         case NETCONFA_IFINDEX_DEFAULT:
 542                 devconf = net->ipv6.devconf_dflt;
 543                 break;
 544         default:
 545                 dev = __dev_get_by_index(net, ifindex);
 546                 if (dev == NULL)
 547                         goto errout;
 548                 in6_dev = __in6_dev_get(dev);
 549                 if (in6_dev == NULL)
 550                         goto errout;
 551                 devconf = &in6_dev->cnf;
 552                 break;
 553         }
 554
 555         err = -ENOBUFS;
 556         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 557         if (skb == NULL)
 558                 goto errout;
 559
 560         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 561                                          NETLINK_CB(in_skb).portid,
 562                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 563                                          -1);
 564         if (err < 0) {
 565                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 566                 WARN_ON(err == -EMSGSIZE);
 567                 kfree_skb(skb);
 568                 goto errout;
 569         }
 570         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 571 errout:
 572         return err;
 573 }
 574
 575 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 576                                       struct netlink_callback *cb)
 577 {
 578         struct net *net = sock_net(skb->sk);
 579         int h, s_h;
 580         int idx, s_idx;
 581         struct net_device *dev;
 582         struct inet6_dev *idev;
 583         struct hlist_head *head;
 584
 585         s_h = cb->args[0];
 586         s_idx = idx = cb->args[1];
 587
 588         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 589                 idx = 0;
 590                 head = &net->dev_index_head[h];
 591                 rcu_read_lock();
 592                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 593                           net->dev_base_seq;
 594                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 595                         if (idx < s_idx)
 596                                 goto cont;
 597                         idev = __in6_dev_get(dev);
 598                         if (!idev)
 599                                 goto cont;
 600
 601                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 602                                                        &idev->cnf,
 603                                                        NETLINK_CB(cb->skb).portid,
 604                                                        cb->nlh->nlmsg_seq,
 605                                                        RTM_NEWNETCONF,
 606                                                        NLM_F_MULTI,
 607                                                        -1) <= 0) {
 608                                 rcu_read_unlock();
 609                                 goto done;
 610                         }
 611                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 612 cont:
 613                         idx++;
 614                 }
 615                 rcu_read_unlock();
 616         }
 617         if (h == NETDEV_HASHENTRIES) {
 618                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 619                                                net->ipv6.devconf_all,
 620                                                NETLINK_CB(cb->skb).portid,
 621                                                cb->nlh->nlmsg_seq,
 622                                                RTM_NEWNETCONF, NLM_F_MULTI,
 623                                                -1) <= 0)
 624                         goto done;
 625                 else
 626                         h++;
 627         }
 628         if (h == NETDEV_HASHENTRIES + 1) {
 629                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 630                                                net->ipv6.devconf_dflt,
 631                                                NETLINK_CB(cb->skb).portid,
 632                                                cb->nlh->nlmsg_seq,
 633                                                RTM_NEWNETCONF, NLM_F_MULTI,
 634                                                -1) <= 0)
 635                         goto done;
 636                 else
 637                         h++;
 638         }
 639 done:
 640         cb->args[0] = h;
 641         cb->args[1] = idx;
 642
 643         return skb->len;
 644 }
 645
 646 #ifdef CONFIG_SYSCTL
 647 static void dev_forward_change(struct inet6_dev *idev)
 648 {
 649         struct net_device *dev;
 650         struct inet6_ifaddr *ifa;
 651
 652         if (!idev)
 653                 return;
 654         dev = idev->dev;
 655         if (idev->cnf.forwarding)
 656                 dev_disable_lro(dev);
 657         if (dev->flags & IFF_MULTICAST) {
 658                 if (idev->cnf.forwarding) {
 659                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 660                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 661                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 662                 } else {
 663                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 664                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 665                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 666                 }
 667         }
 668
 669         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 670                 if (ifa->flags&IFA_F_TENTATIVE)
 671                         continue;
 672                 if (idev->cnf.forwarding)
 673                         addrconf_join_anycast(ifa);
 674                 else
 675                         addrconf_leave_anycast(ifa);
 676         }
 677         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 678                                      dev->ifindex, &idev->cnf);
 679 }
 680
 681
 682 static void addrconf_forward_change(struct net *net, __s32 newf)
 683 {
 684         struct net_device *dev;
 685         struct inet6_dev *idev;
 686
 687         for_each_netdev(net, dev) {
 688                 idev = __in6_dev_get(dev);
 689                 if (idev) {
 690                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 691                         idev->cnf.forwarding = newf;
 692                         if (changed)
 693                                 dev_forward_change(idev);
 694                 }
 695         }
 696 }
 697
 698 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 699 {
 700         struct net *net;
 701         int old;
 702
 703         if (!rtnl_trylock())
 704                 return restart_syscall();
 705
 706         net = (struct net *)table->extra2;
 707         old = *p;
 708         *p = newf;
 709
 710         if (p == &net->ipv6.devconf_dflt->forwarding) {
 711                 if ((!newf) ^ (!old))
 712                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 713                                                      NETCONFA_IFINDEX_DEFAULT,
 714                                                      net->ipv6.devconf_dflt);
 715                 rtnl_unlock();
 716                 return 0;
 717         }
 718
 719         if (p == &net->ipv6.devconf_all->forwarding) {
 720                 net->ipv6.devconf_dflt->forwarding = newf;
 721                 addrconf_forward_change(net, newf);
 722                 if ((!newf) ^ (!old))
 723                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 724                                                      NETCONFA_IFINDEX_ALL,
 725                                                      net->ipv6.devconf_all);
 726         } else if ((!newf) ^ (!old))
 727                 dev_forward_change((struct inet6_dev *)table->extra1);
 728         rtnl_unlock();
 729
 730         if (newf)
 731                 rt6_purge_dflt_routers(net);
 732         return 1;
 733 }
 734 #endif
 735
 736 /* Nobody refers to this ifaddr, destroy it */
 737 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 738 {
 739         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 740
 741 #ifdef NET_REFCNT_DEBUG
 742         pr_debug("%s\n", __func__);
 743 #endif
 744
 745         in6_dev_put(ifp->idev);
 746
 747         if (del_timer(&ifp->dad_timer))
 748                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 749
 750         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 751                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 752                 return;
 753         }
 754         ip6_rt_put(ifp->rt);
 755
 756         kfree_rcu(ifp, rcu);
 757 }
 758
 759 static void
 760 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 761 {
 762         struct list_head *p;
 763         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 764
 765         /*
 766          * Each device address list is sorted in order of scope -
 767          * global before linklocal.
 768          */
 769         list_for_each(p, &idev->addr_list) {
 770                 struct inet6_ifaddr *ifa
 771                         = list_entry(p, struct inet6_ifaddr, if_list);
 772                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 773                         break;
 774         }
 775
 776         list_add_tail(&ifp->if_list, p);
 777 }
 778
 779 static u32 inet6_addr_hash(const struct in6_addr *addr)
 780 {
 781         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 782 }
 783
 784 /* On success it returns ifp with increased reference count */
 785
 786 static struct inet6_ifaddr *
 787 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 788               const struct in6_addr *peer_addr, int pfxlen,
 789               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 790 {
 791         struct inet6_ifaddr *ifa = NULL;
 792         struct rt6_info *rt;
 793         unsigned int hash;
 794         int err = 0;
 795         int addr_type = ipv6_addr_type(addr);
 796
 797         if (addr_type == IPV6_ADDR_ANY ||
 798             addr_type & IPV6_ADDR_MULTICAST ||
 799             (!(idev->dev->flags & IFF_LOOPBACK) &&
 800              addr_type & IPV6_ADDR_LOOPBACK))
 801                 return ERR_PTR(-EADDRNOTAVAIL);
 802
 803         rcu_read_lock_bh();
 804         if (idev->dead) {
 805                 err = -ENODEV;                  /*XXX*/
 806                 goto out2;
 807         }
 808
 809         if (idev->cnf.disable_ipv6) {
 810                 err = -EACCES;
 811                 goto out2;
 812         }
 813
 814         spin_lock(&addrconf_hash_lock);
 815
 816         /* Ignore adding duplicate addresses on an interface */
 817         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 818                 ADBG("ipv6_add_addr: already assigned\n");
 819                 err = -EEXIST;
 820                 goto out;
 821         }
 822
 823         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 824
 825         if (ifa == NULL) {
 826                 ADBG("ipv6_add_addr: malloc failed\n");
 827                 err = -ENOBUFS;
 828                 goto out;
 829         }
 830
 831         rt = addrconf_dst_alloc(idev, addr, false);
 832         if (IS_ERR(rt)) {
 833                 err = PTR_ERR(rt);
 834                 goto out;
 835         }
 836
 837         ifa->addr = *addr;
 838         if (peer_addr)
 839                 ifa->peer_addr = *peer_addr;
 840
 841         spin_lock_init(&ifa->lock);
 842         spin_lock_init(&ifa->state_lock);
 843         setup_timer(&ifa->dad_timer, addrconf_dad_timer,
 844                     (unsigned long)ifa);
 845         INIT_HLIST_NODE(&ifa->addr_lst);
 846         ifa->scope = scope;
 847         ifa->prefix_len = pfxlen;
 848         ifa->flags = flags | IFA_F_TENTATIVE;
 849         ifa->valid_lft = valid_lft;
 850         ifa->prefered_lft = prefered_lft;
 851         ifa->cstamp = ifa->tstamp = jiffies;
 852         ifa->tokenized = false;
 853
 854         ifa->rt = rt;
 855
 856         ifa->idev = idev;
 857         in6_dev_hold(idev);
 858         /* For caller */
 859         in6_ifa_hold(ifa);
 860
 861         /* Add to big hash table */
 862         hash = inet6_addr_hash(addr);
 863
 864         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 865         spin_unlock(&addrconf_hash_lock);
 866
 867         write_lock(&idev->lock);
 868         /* Add to inet6_dev unicast addr list. */
 869         ipv6_link_dev_addr(idev, ifa);
 870
 871         if (ifa->flags&IFA_F_TEMPORARY) {
 872                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 873                 in6_ifa_hold(ifa);
 874         }
 875
 876         in6_ifa_hold(ifa);
 877         write_unlock(&idev->lock);
 878 out2:
 879         rcu_read_unlock_bh();
 880
 881         if (likely(err == 0))
 882                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 883         else {
 884                 kfree(ifa);
 885                 ifa = ERR_PTR(err);
 886         }
 887
 888         return ifa;
 889 out:
 890         spin_unlock(&addrconf_hash_lock);
 891         goto out2;
 892 }
 893
 894 /* This function wants to get referenced ifp and releases it before return */
 895
 896 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 897 {
 898         struct inet6_ifaddr *ifa, *ifn;
 899         struct inet6_dev *idev = ifp->idev;
 900         int state;
 901         int deleted = 0, onlink = 0;
 902         unsigned long expires = jiffies;
 903
 904         spin_lock_bh(&ifp->state_lock);
 905         state = ifp->state;
 906         ifp->state = INET6_IFADDR_STATE_DEAD;
 907         spin_unlock_bh(&ifp->state_lock);
 908
 909         if (state == INET6_IFADDR_STATE_DEAD)
 910                 goto out;
 911
 912         spin_lock_bh(&addrconf_hash_lock);
 913         hlist_del_init_rcu(&ifp->addr_lst);
 914         spin_unlock_bh(&addrconf_hash_lock);
 915
 916         write_lock_bh(&idev->lock);
 917
 918         if (ifp->flags&IFA_F_TEMPORARY) {
 919                 list_del(&ifp->tmp_list);
 920                 if (ifp->ifpub) {
 921                         in6_ifa_put(ifp->ifpub);
 922                         ifp->ifpub = NULL;
 923                 }
 924                 __in6_ifa_put(ifp);
 925         }
 926
 927         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 928                 if (ifa == ifp) {
 929                         list_del_init(&ifp->if_list);
 930                         __in6_ifa_put(ifp);
 931
 932                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 933                                 break;
 934                         deleted = 1;
 935                         continue;
 936                 } else if (ifp->flags & IFA_F_PERMANENT) {
 937                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 938                                               ifp->prefix_len)) {
 939                                 if (ifa->flags & IFA_F_PERMANENT) {
 940                                         onlink = 1;
 941                                         if (deleted)
 942                                                 break;
 943                                 } else {
 944                                         unsigned long lifetime;
 945
 946                                         if (!onlink)
 947                                                 onlink = -1;
 948
 949                                         spin_lock(&ifa->lock);
 950
 951                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 952                                         /*
 953                                          * Note: Because this address is
 954                                          * not permanent, lifetime <
 955                                          * LONG_MAX / HZ here.
 956                                          */
 957                                         if (time_before(expires,
 958                                                         ifa->tstamp + lifetime * HZ))
 959                                                 expires = ifa->tstamp + lifetime * HZ;
 960                                         spin_unlock(&ifa->lock);
 961                                 }
 962                         }
 963                 }
 964         }
 965         write_unlock_bh(&idev->lock);
 966
 967         addrconf_del_dad_timer(ifp);
 968
 969         ipv6_ifa_notify(RTM_DELADDR, ifp);
 970
 971         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
 972
 973         /*
 974          * Purge or update corresponding prefix
 975          *
 976          * 1) we don't purge prefix here if address was not permanent.
 977          *    prefix is managed by its own lifetime.
 978          * 2) if there're no addresses, delete prefix.
 979          * 3) if there're still other permanent address(es),
 980          *    corresponding prefix is still permanent.
 981          * 4) otherwise, update prefix lifetime to the
 982          *    longest valid lifetime among the corresponding
 983          *    addresses on the device.
 984          *    Note: subsequent RA will update lifetime.
 985          *
 986          * --yoshfuji
 987          */
 988         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
 989                 struct in6_addr prefix;
 990                 struct rt6_info *rt;
 991
 992                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
 993
 994                 rt = addrconf_get_prefix_route(&prefix,
 995                                                ifp->prefix_len,
 996                                                ifp->idev->dev,
 997                                                0, RTF_GATEWAY | RTF_DEFAULT);
 998
 999                 if (rt) {
1000                         if (onlink == 0) {
1001                                 ip6_del_rt(rt);
1002                                 rt = NULL;
1003                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1004                                 rt6_set_expires(rt, expires);
1005                         }
1006                 }
1007                 ip6_rt_put(rt);
1008         }
1009
1010         /* clean up prefsrc entries */
1011         rt6_remove_prefsrc(ifp);
1012 out:
1013         in6_ifa_put(ifp);
1014 }
1015
1016 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1017 {
1018         struct inet6_dev *idev = ifp->idev;
1019         struct in6_addr addr, *tmpaddr;
1020         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1021         unsigned long regen_advance;
1022         int tmp_plen;
1023         int ret = 0;
1024         u32 addr_flags;
1025         unsigned long now = jiffies;
1026
1027         write_lock(&idev->lock);
1028         if (ift) {
1029                 spin_lock_bh(&ift->lock);
1030                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1031                 spin_unlock_bh(&ift->lock);
1032                 tmpaddr = &addr;
1033         } else {
1034                 tmpaddr = NULL;
1035         }
1036 retry:
1037         in6_dev_hold(idev);
1038         if (idev->cnf.use_tempaddr <= 0) {
1039                 write_unlock(&idev->lock);
1040                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1041                 in6_dev_put(idev);
1042                 ret = -1;
1043                 goto out;
1044         }
1045         spin_lock_bh(&ifp->lock);
1046         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1047                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1048                 spin_unlock_bh(&ifp->lock);
1049                 write_unlock(&idev->lock);
1050                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1051                         __func__);
1052                 in6_dev_put(idev);
1053                 ret = -1;
1054                 goto out;
1055         }
1056         in6_ifa_hold(ifp);
1057         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1058         __ipv6_try_regen_rndid(idev, tmpaddr);
1059         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1060         age = (now - ifp->tstamp) / HZ;
1061         tmp_valid_lft = min_t(__u32,
1062                               ifp->valid_lft,
1063                               idev->cnf.temp_valid_lft + age);
1064         tmp_prefered_lft = min_t(__u32,
1065                                  ifp->prefered_lft,
1066                                  idev->cnf.temp_prefered_lft + age -
1067                                  idev->cnf.max_desync_factor);
1068         tmp_plen = ifp->prefix_len;
1069         tmp_tstamp = ifp->tstamp;
1070         spin_unlock_bh(&ifp->lock);
1071
1072         regen_advance = idev->cnf.regen_max_retry *
1073                         idev->cnf.dad_transmits *
1074                         idev->nd_parms->retrans_time / HZ;
1075         write_unlock(&idev->lock);
1076
1077         /* A temporary address is created only if this calculated Preferred
1078          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1079          * an implementation must not create a temporary address with a zero
1080          * Preferred Lifetime.
1081          */
1082         if (tmp_prefered_lft <= regen_advance) {
1083                 in6_ifa_put(ifp);
1084                 in6_dev_put(idev);
1085                 ret = -1;
1086                 goto out;
1087         }
1088
1089         addr_flags = IFA_F_TEMPORARY;
1090         /* set in addrconf_prefix_rcv() */
1091         if (ifp->flags & IFA_F_OPTIMISTIC)
1092                 addr_flags |= IFA_F_OPTIMISTIC;
1093
1094         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1095                             ipv6_addr_scope(&addr), addr_flags,
1096                             tmp_valid_lft, tmp_prefered_lft);
1097         if (IS_ERR(ift)) {
1098                 in6_ifa_put(ifp);
1099                 in6_dev_put(idev);
1100                 pr_info("%s: retry temporary address regeneration\n", __func__);
1101                 tmpaddr = &addr;
1102                 write_lock(&idev->lock);
1103                 goto retry;
1104         }
1105
1106         spin_lock_bh(&ift->lock);
1107         ift->ifpub = ifp;
1108         ift->cstamp = now;
1109         ift->tstamp = tmp_tstamp;
1110         spin_unlock_bh(&ift->lock);
1111
1112         addrconf_dad_start(ift);
1113         in6_ifa_put(ift);
1114         in6_dev_put(idev);
1115 out:
1116         return ret;
1117 }
1118
1119 /*
1120  *      Choose an appropriate source address (RFC3484)
1121  */
1122 enum {
1123         IPV6_SADDR_RULE_INIT = 0,
1124         IPV6_SADDR_RULE_LOCAL,
1125         IPV6_SADDR_RULE_SCOPE,
1126         IPV6_SADDR_RULE_PREFERRED,
1127 #ifdef CONFIG_IPV6_MIP6
1128         IPV6_SADDR_RULE_HOA,
1129 #endif
1130         IPV6_SADDR_RULE_OIF,
1131         IPV6_SADDR_RULE_LABEL,
1132         IPV6_SADDR_RULE_PRIVACY,
1133         IPV6_SADDR_RULE_ORCHID,
1134         IPV6_SADDR_RULE_PREFIX,
1135         IPV6_SADDR_RULE_MAX
1136 };
1137
1138 struct ipv6_saddr_score {
1139         int                     rule;
1140         int                     addr_type;
1141         struct inet6_ifaddr     *ifa;
1142         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1143         int                     scopedist;
1144         int                     matchlen;
1145 };
1146
1147 struct ipv6_saddr_dst {
1148         const struct in6_addr *addr;
1149         int ifindex;
1150         int scope;
1151         int label;
1152         unsigned int prefs;
1153 };
1154
1155 static inline int ipv6_saddr_preferred(int type)
1156 {
1157         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1158                 return 1;
1159         return 0;
1160 }
1161
1162 static int ipv6_get_saddr_eval(struct net *net,
1163                                struct ipv6_saddr_score *score,
1164                                struct ipv6_saddr_dst *dst,
1165                                int i)
1166 {
1167         int ret;
1168
1169         if (i <= score->rule) {
1170                 switch (i) {
1171                 case IPV6_SADDR_RULE_SCOPE:
1172                         ret = score->scopedist;
1173                         break;
1174                 case IPV6_SADDR_RULE_PREFIX:
1175                         ret = score->matchlen;
1176                         break;
1177                 default:
1178                         ret = !!test_bit(i, score->scorebits);
1179                 }
1180                 goto out;
1181         }
1182
1183         switch (i) {
1184         case IPV6_SADDR_RULE_INIT:
1185                 /* Rule 0: remember if hiscore is not ready yet */
1186                 ret = !!score->ifa;
1187                 break;
1188         case IPV6_SADDR_RULE_LOCAL:
1189                 /* Rule 1: Prefer same address */
1190                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1191                 break;
1192         case IPV6_SADDR_RULE_SCOPE:
1193                 /* Rule 2: Prefer appropriate scope
1194                  *
1195                  *      ret
1196                  *       ^
1197                  *    -1 |  d 15
1198                  *    ---+--+-+---> scope
1199                  *       |
1200                  *       |             d is scope of the destination.
1201                  *  B-d  |  \
1202                  *       |   \      <- smaller scope is better if
1203                  *  B-15 |    \        if scope is enough for destinaion.
1204                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1205                  * d-C-1 | /
1206                  *       |/         <- greater is better
1207                  *   -C  /             if scope is not enough for destination.
1208                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1209                  *
1210                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1211                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1212                  * Assume B = 0 and we get C > 29.
1213                  */
1214                 ret = __ipv6_addr_src_scope(score->addr_type);
1215                 if (ret >= dst->scope)
1216                         ret = -ret;
1217                 else
1218                         ret -= 128;     /* 30 is enough */
1219                 score->scopedist = ret;
1220                 break;
1221         case IPV6_SADDR_RULE_PREFERRED:
1222                 /* Rule 3: Avoid deprecated and optimistic addresses */
1223                 ret = ipv6_saddr_preferred(score->addr_type) ||
1224                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1225                 break;
1226 #ifdef CONFIG_IPV6_MIP6
1227         case IPV6_SADDR_RULE_HOA:
1228             {
1229                 /* Rule 4: Prefer home address */
1230                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1231                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1232                 break;
1233             }
1234 #endif
1235         case IPV6_SADDR_RULE_OIF:
1236                 /* Rule 5: Prefer outgoing interface */
1237                 ret = (!dst->ifindex ||
1238                        dst->ifindex == score->ifa->idev->dev->ifindex);
1239                 break;
1240         case IPV6_SADDR_RULE_LABEL:
1241                 /* Rule 6: Prefer matching label */
1242                 ret = ipv6_addr_label(net,
1243                                       &score->ifa->addr, score->addr_type,
1244                                       score->ifa->idev->dev->ifindex) == dst->label;
1245                 break;
1246         case IPV6_SADDR_RULE_PRIVACY:
1247             {
1248                 /* Rule 7: Prefer public address
1249                  * Note: prefer temporary address if use_tempaddr >= 2
1250                  */
1251                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1252                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1253                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1254                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1255                 break;
1256             }
1257         case IPV6_SADDR_RULE_ORCHID:
1258                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1259                  *          non-ORCHID vs non-ORCHID
1260                  */
1261                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1262                         ipv6_addr_orchid(dst->addr));
1263                 break;
1264         case IPV6_SADDR_RULE_PREFIX:
1265                 /* Rule 8: Use longest matching prefix */
1266                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1267                 if (ret > score->ifa->prefix_len)
1268                         ret = score->ifa->prefix_len;
1269                 score->matchlen = ret;
1270                 break;
1271         default:
1272                 ret = 0;
1273         }
1274
1275         if (ret)
1276                 __set_bit(i, score->scorebits);
1277         score->rule = i;
1278 out:
1279         return ret;
1280 }
1281
1282 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1283                        const struct in6_addr *daddr, unsigned int prefs,
1284                        struct in6_addr *saddr)
1285 {
1286         struct ipv6_saddr_score scores[2],
1287                                 *score = &scores[0], *hiscore = &scores[1];
1288         struct ipv6_saddr_dst dst;
1289         struct net_device *dev;
1290         int dst_type;
1291
1292         dst_type = __ipv6_addr_type(daddr);
1293         dst.addr = daddr;
1294         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1295         dst.scope = __ipv6_addr_src_scope(dst_type);
1296         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1297         dst.prefs = prefs;
1298
1299         hiscore->rule = -1;
1300         hiscore->ifa = NULL;
1301
1302         rcu_read_lock();
1303
1304         for_each_netdev_rcu(net, dev) {
1305                 struct inet6_dev *idev;
1306
1307                 /* Candidate Source Address (section 4)
1308                  *  - multicast and link-local destination address,
1309                  *    the set of candidate source address MUST only
1310                  *    include addresses assigned to interfaces
1311                  *    belonging to the same link as the outgoing
1312                  *    interface.
1313                  * (- For site-local destination addresses, the
1314                  *    set of candidate source addresses MUST only
1315                  *    include addresses assigned to interfaces
1316                  *    belonging to the same site as the outgoing
1317                  *    interface.)
1318                  */
1319                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1320                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1321                     dst.ifindex && dev->ifindex != dst.ifindex)
1322                         continue;
1323
1324                 idev = __in6_dev_get(dev);
1325                 if (!idev)
1326                         continue;
1327
1328                 read_lock_bh(&idev->lock);
1329                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1330                         int i;
1331
1332                         /*
1333                          * - Tentative Address (RFC2462 section 5.4)
1334                          *  - A tentative address is not considered
1335                          *    "assigned to an interface" in the traditional
1336                          *    sense, unless it is also flagged as optimistic.
1337                          * - Candidate Source Address (section 4)
1338                          *  - In any case, anycast addresses, multicast
1339                          *    addresses, and the unspecified address MUST
1340                          *    NOT be included in a candidate set.
1341                          */
1342                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1343                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1344                                 continue;
1345
1346                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1347
1348                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1349                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1350                                 LIMIT_NETDEBUG(KERN_DEBUG
1351                                                "ADDRCONF: unspecified / multicast address "
1352                                                "assigned as unicast address on %s",
1353                                                dev->name);
1354                                 continue;
1355                         }
1356
1357                         score->rule = -1;
1358                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1359
1360                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1361                                 int minihiscore, miniscore;
1362
1363                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1364                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1365
1366                                 if (minihiscore > miniscore) {
1367                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1368                                             score->scopedist > 0) {
1369                                                 /*
1370                                                  * special case:
1371                                                  * each remaining entry
1372                                                  * has too small (not enough)
1373                                                  * scope, because ifa entries
1374                                                  * are sorted by their scope
1375                                                  * values.
1376                                                  */
1377                                                 goto try_nextdev;
1378                                         }
1379                                         break;
1380                                 } else if (minihiscore < miniscore) {
1381                                         if (hiscore->ifa)
1382                                                 in6_ifa_put(hiscore->ifa);
1383
1384                                         in6_ifa_hold(score->ifa);
1385
1386                                         swap(hiscore, score);
1387
1388                                         /* restore our iterator */
1389                                         score->ifa = hiscore->ifa;
1390
1391                                         break;
1392                                 }
1393                         }
1394                 }
1395 try_nextdev:
1396                 read_unlock_bh(&idev->lock);
1397         }
1398         rcu_read_unlock();
1399
1400         if (!hiscore->ifa)
1401                 return -EADDRNOTAVAIL;
1402
1403         *saddr = hiscore->ifa->addr;
1404         in6_ifa_put(hiscore->ifa);
1405         return 0;
1406 }
1407 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1408
1409 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1410                       unsigned char banned_flags)
1411 {
1412         struct inet6_ifaddr *ifp;
1413         int err = -EADDRNOTAVAIL;
1414
1415         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1416                 if (ifp->scope == IFA_LINK &&
1417                     !(ifp->flags & banned_flags)) {
1418                         *addr = ifp->addr;
1419                         err = 0;
1420                         break;
1421                 }
1422         }
1423         return err;
1424 }
1425
1426 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1427                     unsigned char banned_flags)
1428 {
1429         struct inet6_dev *idev;
1430         int err = -EADDRNOTAVAIL;
1431
1432         rcu_read_lock();
1433         idev = __in6_dev_get(dev);
1434         if (idev) {
1435                 read_lock_bh(&idev->lock);
1436                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1437                 read_unlock_bh(&idev->lock);
1438         }
1439         rcu_read_unlock();
1440         return err;
1441 }
1442
1443 static int ipv6_count_addresses(struct inet6_dev *idev)
1444 {
1445         int cnt = 0;
1446         struct inet6_ifaddr *ifp;
1447
1448         read_lock_bh(&idev->lock);
1449         list_for_each_entry(ifp, &idev->addr_list, if_list)
1450                 cnt++;
1451         read_unlock_bh(&idev->lock);
1452         return cnt;
1453 }
1454
1455 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1456                   const struct net_device *dev, int strict)
1457 {
1458         struct inet6_ifaddr *ifp;
1459         unsigned int hash = inet6_addr_hash(addr);
1460
1461         rcu_read_lock_bh();
1462         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1463                 if (!net_eq(dev_net(ifp->idev->dev), net))
1464                         continue;
1465                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1466                     !(ifp->flags&IFA_F_TENTATIVE) &&
1467                     (dev == NULL || ifp->idev->dev == dev ||
1468                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1469                         rcu_read_unlock_bh();
1470                         return 1;
1471                 }
1472         }
1473
1474         rcu_read_unlock_bh();
1475         return 0;
1476 }
1477 EXPORT_SYMBOL(ipv6_chk_addr);
1478
1479 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1480                                struct net_device *dev)
1481 {
1482         unsigned int hash = inet6_addr_hash(addr);
1483         struct inet6_ifaddr *ifp;
1484
1485         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1486                 if (!net_eq(dev_net(ifp->idev->dev), net))
1487                         continue;
1488                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1489                         if (dev == NULL || ifp->idev->dev == dev)
1490                                 return true;
1491                 }
1492         }
1493         return false;
1494 }
1495
1496 /* Compares an address/prefix_len with addresses on device @dev.
1497  * If one is found it returns true.
1498  */
1499 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1500         const unsigned int prefix_len, struct net_device *dev)
1501 {
1502         struct inet6_dev *idev;
1503         struct inet6_ifaddr *ifa;
1504         bool ret = false;
1505
1506         rcu_read_lock();
1507         idev = __in6_dev_get(dev);
1508         if (idev) {
1509                 read_lock_bh(&idev->lock);
1510                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1511                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1512                         if (ret)
1513                                 break;
1514                 }
1515                 read_unlock_bh(&idev->lock);
1516         }
1517         rcu_read_unlock();
1518
1519         return ret;
1520 }
1521 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1522
1523 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1524 {
1525         struct inet6_dev *idev;
1526         struct inet6_ifaddr *ifa;
1527         int     onlink;
1528
1529         onlink = 0;
1530         rcu_read_lock();
1531         idev = __in6_dev_get(dev);
1532         if (idev) {
1533                 read_lock_bh(&idev->lock);
1534                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1535                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1536                                                    ifa->prefix_len);
1537                         if (onlink)
1538                                 break;
1539                 }
1540                 read_unlock_bh(&idev->lock);
1541         }
1542         rcu_read_unlock();
1543         return onlink;
1544 }
1545 EXPORT_SYMBOL(ipv6_chk_prefix);
1546
1547 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1548                                      struct net_device *dev, int strict)
1549 {
1550         struct inet6_ifaddr *ifp, *result = NULL;
1551         unsigned int hash = inet6_addr_hash(addr);
1552
1553         rcu_read_lock_bh();
1554         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1555                 if (!net_eq(dev_net(ifp->idev->dev), net))
1556                         continue;
1557                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1558                         if (dev == NULL || ifp->idev->dev == dev ||
1559                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1560                                 result = ifp;
1561                                 in6_ifa_hold(ifp);
1562                                 break;
1563                         }
1564                 }
1565         }
1566         rcu_read_unlock_bh();
1567
1568         return result;
1569 }
1570
1571 /* Gets referenced address, destroys ifaddr */
1572
1573 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1574 {
1575         if (ifp->flags&IFA_F_PERMANENT) {
1576                 spin_lock_bh(&ifp->lock);
1577                 addrconf_del_dad_timer(ifp);
1578                 ifp->flags |= IFA_F_TENTATIVE;
1579                 if (dad_failed)
1580                         ifp->flags |= IFA_F_DADFAILED;
1581                 spin_unlock_bh(&ifp->lock);
1582                 if (dad_failed)
1583                         ipv6_ifa_notify(0, ifp);
1584                 in6_ifa_put(ifp);
1585         } else if (ifp->flags&IFA_F_TEMPORARY) {
1586                 struct inet6_ifaddr *ifpub;
1587                 spin_lock_bh(&ifp->lock);
1588                 ifpub = ifp->ifpub;
1589                 if (ifpub) {
1590                         in6_ifa_hold(ifpub);
1591                         spin_unlock_bh(&ifp->lock);
1592                         ipv6_create_tempaddr(ifpub, ifp);
1593                         in6_ifa_put(ifpub);
1594                 } else {
1595                         spin_unlock_bh(&ifp->lock);
1596                 }
1597                 ipv6_del_addr(ifp);
1598         } else
1599                 ipv6_del_addr(ifp);
1600 }
1601
1602 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1603 {
1604         int err = -ENOENT;
1605
1606         spin_lock(&ifp->state_lock);
1607         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1608                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1609                 err = 0;
1610         }
1611         spin_unlock(&ifp->state_lock);
1612
1613         return err;
1614 }
1615
1616 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1617 {
1618         struct inet6_dev *idev = ifp->idev;
1619
1620         if (addrconf_dad_end(ifp)) {
1621                 in6_ifa_put(ifp);
1622                 return;
1623         }
1624
1625         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1626                              ifp->idev->dev->name, &ifp->addr);
1627
1628         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1629                 struct in6_addr addr;
1630
1631                 addr.s6_addr32[0] = htonl(0xfe800000);
1632                 addr.s6_addr32[1] = 0;
1633
1634                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1635                     ipv6_addr_equal(&ifp->addr, &addr)) {
1636                         /* DAD failed for link-local based on MAC address */
1637                         idev->cnf.disable_ipv6 = 1;
1638
1639                         pr_info("%s: IPv6 being disabled!\n",
1640                                 ifp->idev->dev->name);
1641                 }
1642         }
1643
1644         addrconf_dad_stop(ifp, 1);
1645 }
1646
1647 /* Join to solicited addr multicast group. */
1648
1649 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1650 {
1651         struct in6_addr maddr;
1652
1653         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1654                 return;
1655
1656         addrconf_addr_solict_mult(addr, &maddr);
1657         ipv6_dev_mc_inc(dev, &maddr);
1658 }
1659
1660 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1661 {
1662         struct in6_addr maddr;
1663
1664         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1665                 return;
1666
1667         addrconf_addr_solict_mult(addr, &maddr);
1668         __ipv6_dev_mc_dec(idev, &maddr);
1669 }
1670
1671 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1672 {
1673         struct in6_addr addr;
1674         if (ifp->prefix_len >= 127) /* RFC 6164 */
1675                 return;
1676         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1677         if (ipv6_addr_any(&addr))
1678                 return;
1679         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1680 }
1681
1682 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1683 {
1684         struct in6_addr addr;
1685         if (ifp->prefix_len >= 127) /* RFC 6164 */
1686                 return;
1687         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1688         if (ipv6_addr_any(&addr))
1689                 return;
1690         __ipv6_dev_ac_dec(ifp->idev, &addr);
1691 }
1692
1693 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1694 {
1695         if (dev->addr_len != ETH_ALEN)
1696                 return -1;
1697         memcpy(eui, dev->dev_addr, 3);
1698         memcpy(eui + 5, dev->dev_addr + 3, 3);
1699
1700         /*
1701          * The zSeries OSA network cards can be shared among various
1702          * OS instances, but the OSA cards have only one MAC address.
1703          * This leads to duplicate address conflicts in conjunction
1704          * with IPv6 if more than one instance uses the same card.
1705          *
1706          * The driver for these cards can deliver a unique 16-bit
1707          * identifier for each instance sharing the same card.  It is
1708          * placed instead of 0xFFFE in the interface identifier.  The
1709          * "u" bit of the interface identifier is not inverted in this
1710          * case.  Hence the resulting interface identifier has local
1711          * scope according to RFC2373.
1712          */
1713         if (dev->dev_id) {
1714                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1715                 eui[4] = dev->dev_id & 0xFF;
1716         } else {
1717                 eui[3] = 0xFF;
1718                 eui[4] = 0xFE;
1719                 eui[0] ^= 2;
1720         }
1721         return 0;
1722 }
1723
1724 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1725 {
1726         if (dev->addr_len != IEEE802154_ADDR_LEN)
1727                 return -1;
1728         memcpy(eui, dev->dev_addr, 8);
1729         eui[0] ^= 2;
1730         return 0;
1731 }
1732
1733 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1734 {
1735         union fwnet_hwaddr *ha;
1736
1737         if (dev->addr_len != FWNET_ALEN)
1738                 return -1;
1739
1740         ha = (union fwnet_hwaddr *)dev->dev_addr;
1741
1742         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1743         eui[0] ^= 2;
1744         return 0;
1745 }
1746
1747 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1748 {
1749         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1750         if (dev->addr_len != ARCNET_ALEN)
1751                 return -1;
1752         memset(eui, 0, 7);
1753         eui[7] = *(u8 *)dev->dev_addr;
1754         return 0;
1755 }
1756
1757 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1758 {
1759         if (dev->addr_len != INFINIBAND_ALEN)
1760                 return -1;
1761         memcpy(eui, dev->dev_addr + 12, 8);
1762         eui[0] |= 2;
1763         return 0;
1764 }
1765
1766 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1767 {
1768         if (addr == 0)
1769                 return -1;
1770         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1771                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1772                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1773                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1774                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1775                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1776         eui[1] = 0;
1777         eui[2] = 0x5E;
1778         eui[3] = 0xFE;
1779         memcpy(eui + 4, &addr, 4);
1780         return 0;
1781 }
1782
1783 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1784 {
1785         if (dev->priv_flags & IFF_ISATAP)
1786                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1787         return -1;
1788 }
1789
1790 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1791 {
1792         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1793 }
1794
1795 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1796 {
1797         memcpy(eui, dev->perm_addr, 3);
1798         memcpy(eui + 5, dev->perm_addr + 3, 3);
1799         eui[3] = 0xFF;
1800         eui[4] = 0xFE;
1801         eui[0] ^= 2;
1802         return 0;
1803 }
1804
1805 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1806 {
1807         switch (dev->type) {
1808         case ARPHRD_ETHER:
1809         case ARPHRD_FDDI:
1810                 return addrconf_ifid_eui48(eui, dev);
1811         case ARPHRD_ARCNET:
1812                 return addrconf_ifid_arcnet(eui, dev);
1813         case ARPHRD_INFINIBAND:
1814                 return addrconf_ifid_infiniband(eui, dev);
1815         case ARPHRD_SIT:
1816                 return addrconf_ifid_sit(eui, dev);
1817         case ARPHRD_IPGRE:
1818                 return addrconf_ifid_gre(eui, dev);
1819         case ARPHRD_IEEE802154:
1820                 return addrconf_ifid_eui64(eui, dev);
1821         case ARPHRD_IEEE1394:
1822                 return addrconf_ifid_ieee1394(eui, dev);
1823         case ARPHRD_TUNNEL6:
1824                 return addrconf_ifid_ip6tnl(eui, dev);
1825         }
1826         return -1;
1827 }
1828
1829 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1830 {
1831         int err = -1;
1832         struct inet6_ifaddr *ifp;
1833
1834         read_lock_bh(&idev->lock);
1835         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1836                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1837                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1838                         err = 0;
1839                         break;
1840                 }
1841         }
1842         read_unlock_bh(&idev->lock);
1843         return err;
1844 }
1845
1846 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1847 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1848 {
1849 regen:
1850         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1851         idev->rndid[0] &= ~0x02;
1852
1853         /*
1854          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1855          * check if generated address is not inappropriate
1856          *
1857          *  - Reserved subnet anycast (RFC 2526)
1858          *      11111101 11....11 1xxxxxxx
1859          *  - ISATAP (RFC4214) 6.1
1860          *      00-00-5E-FE-xx-xx-xx-xx
1861          *  - value 0
1862          *  - XXX: already assigned to an address on the device
1863          */
1864         if (idev->rndid[0] == 0xfd &&
1865             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1866             (idev->rndid[7]&0x80))
1867                 goto regen;
1868         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1869                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1870                         goto regen;
1871                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1872                         goto regen;
1873         }
1874 }
1875
1876 static void ipv6_regen_rndid(unsigned long data)
1877 {
1878         struct inet6_dev *idev = (struct inet6_dev *) data;
1879         unsigned long expires;
1880
1881         rcu_read_lock_bh();
1882         write_lock_bh(&idev->lock);
1883
1884         if (idev->dead)
1885                 goto out;
1886
1887         __ipv6_regen_rndid(idev);
1888
1889         expires = jiffies +
1890                 idev->cnf.temp_prefered_lft * HZ -
1891                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1892                 idev->cnf.max_desync_factor * HZ;
1893         if (time_before(expires, jiffies)) {
1894                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1895                         __func__, idev->dev->name);
1896                 goto out;
1897         }
1898
1899         if (!mod_timer(&idev->regen_timer, expires))
1900                 in6_dev_hold(idev);
1901
1902 out:
1903         write_unlock_bh(&idev->lock);
1904         rcu_read_unlock_bh();
1905         in6_dev_put(idev);
1906 }
1907
1908 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1909 {
1910         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1911                 __ipv6_regen_rndid(idev);
1912 }
1913
1914 /*
1915  *      Add prefix route.
1916  */
1917
1918 static void
1919 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1920                       unsigned long expires, u32 flags)
1921 {
1922         struct fib6_config cfg = {
1923                 .fc_table = RT6_TABLE_PREFIX,
1924                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1925                 .fc_ifindex = dev->ifindex,
1926                 .fc_expires = expires,
1927                 .fc_dst_len = plen,
1928                 .fc_flags = RTF_UP | flags,
1929                 .fc_nlinfo.nl_net = dev_net(dev),
1930                 .fc_protocol = RTPROT_KERNEL,
1931         };
1932
1933         cfg.fc_dst = *pfx;
1934
1935         /* Prevent useless cloning on PtP SIT.
1936            This thing is done here expecting that the whole
1937            class of non-broadcast devices need not cloning.
1938          */
1939 #if IS_ENABLED(CONFIG_IPV6_SIT)
1940         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1941                 cfg.fc_flags |= RTF_NONEXTHOP;
1942 #endif
1943
1944         ip6_route_add(&cfg);
1945 }
1946
1947
1948 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1949                                                   int plen,
1950                                                   const struct net_device *dev,
1951                                                   u32 flags, u32 noflags)
1952 {
1953         struct fib6_node *fn;
1954         struct rt6_info *rt = NULL;
1955         struct fib6_table *table;
1956
1957         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1958         if (table == NULL)
1959                 return NULL;
1960
1961         read_lock_bh(&table->tb6_lock);
1962         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1963         if (!fn)
1964                 goto out;
1965         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1966                 if (rt->dst.dev->ifindex != dev->ifindex)
1967                         continue;
1968                 if ((rt->rt6i_flags & flags) != flags)
1969                         continue;
1970                 if ((rt->rt6i_flags & noflags) != 0)
1971                         continue;
1972                 dst_hold(&rt->dst);
1973                 break;
1974         }
1975 out:
1976         read_unlock_bh(&table->tb6_lock);
1977         return rt;
1978 }
1979
1980
1981 /* Create "default" multicast route to the interface */
1982
1983 static void addrconf_add_mroute(struct net_device *dev)
1984 {
1985         struct fib6_config cfg = {
1986                 .fc_table = RT6_TABLE_LOCAL,
1987                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1988                 .fc_ifindex = dev->ifindex,
1989                 .fc_dst_len = 8,
1990                 .fc_flags = RTF_UP,
1991                 .fc_nlinfo.nl_net = dev_net(dev),
1992         };
1993
1994         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1995
1996         ip6_route_add(&cfg);
1997 }
1998
1999 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2000 {
2001         struct inet6_dev *idev;
2002
2003         ASSERT_RTNL();
2004
2005         idev = ipv6_find_idev(dev);
2006         if (!idev)
2007                 return ERR_PTR(-ENOBUFS);
2008
2009         if (idev->cnf.disable_ipv6)
2010                 return ERR_PTR(-EACCES);
2011
2012         /* Add default multicast route */
2013         if (!(dev->flags & IFF_LOOPBACK))
2014                 addrconf_add_mroute(dev);
2015
2016         return idev;
2017 }
2018
2019 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2020 {
2021         struct prefix_info *pinfo;
2022         __u32 valid_lft;
2023         __u32 prefered_lft;
2024         int addr_type;
2025         struct inet6_dev *in6_dev;
2026         struct net *net = dev_net(dev);
2027
2028         pinfo = (struct prefix_info *) opt;
2029
2030         if (len < sizeof(struct prefix_info)) {
2031                 ADBG("addrconf: prefix option too short\n");
2032                 return;
2033         }
2034
2035         /*
2036          *      Validation checks ([ADDRCONF], page 19)
2037          */
2038
2039         addr_type = ipv6_addr_type(&pinfo->prefix);
2040
2041         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2042                 return;
2043
2044         valid_lft = ntohl(pinfo->valid);
2045         prefered_lft = ntohl(pinfo->prefered);
2046
2047         if (prefered_lft > valid_lft) {
2048                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2049                 return;
2050         }
2051
2052         in6_dev = in6_dev_get(dev);
2053
2054         if (in6_dev == NULL) {
2055                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2056                                     dev->name);
2057                 return;
2058         }
2059
2060         /*
2061          *      Two things going on here:
2062          *      1) Add routes for on-link prefixes
2063          *      2) Configure prefixes with the auto flag set
2064          */
2065
2066         if (pinfo->onlink) {
2067                 struct rt6_info *rt;
2068                 unsigned long rt_expires;
2069
2070                 /* Avoid arithmetic overflow. Really, we could
2071                  * save rt_expires in seconds, likely valid_lft,
2072                  * but it would require division in fib gc, that it
2073                  * not good.
2074                  */
2075                 if (HZ > USER_HZ)
2076                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2077                 else
2078                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2079
2080                 if (addrconf_finite_timeout(rt_expires))
2081                         rt_expires *= HZ;
2082
2083                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2084                                                pinfo->prefix_len,
2085                                                dev,
2086                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2087                                                RTF_GATEWAY | RTF_DEFAULT);
2088
2089                 if (rt) {
2090                         /* Autoconf prefix route */
2091                         if (valid_lft == 0) {
2092                                 ip6_del_rt(rt);
2093                                 rt = NULL;
2094                         } else if (addrconf_finite_timeout(rt_expires)) {
2095                                 /* not infinity */
2096                                 rt6_set_expires(rt, jiffies + rt_expires);
2097                         } else {
2098                                 rt6_clean_expires(rt);
2099                         }
2100                 } else if (valid_lft) {
2101                         clock_t expires = 0;
2102                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2103                         if (addrconf_finite_timeout(rt_expires)) {
2104                                 /* not infinity */
2105                                 flags |= RTF_EXPIRES;
2106                                 expires = jiffies_to_clock_t(rt_expires);
2107                         }
2108                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2109                                               dev, expires, flags);
2110                 }
2111                 ip6_rt_put(rt);
2112         }
2113
2114         /* Try to figure out our local address for this prefix */
2115
2116         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2117                 struct inet6_ifaddr *ifp;
2118                 struct in6_addr addr;
2119                 int create = 0, update_lft = 0;
2120                 bool tokenized = false;
2121
2122                 if (pinfo->prefix_len == 64) {
2123                         memcpy(&addr, &pinfo->prefix, 8);
2124
2125                         if (!ipv6_addr_any(&in6_dev->token)) {
2126                                 read_lock_bh(&in6_dev->lock);
2127                                 memcpy(addr.s6_addr + 8,
2128                                        in6_dev->token.s6_addr + 8, 8);
2129                                 read_unlock_bh(&in6_dev->lock);
2130                                 tokenized = true;
2131                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2132                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2133                                 in6_dev_put(in6_dev);
2134                                 return;
2135                         }
2136                         goto ok;
2137                 }
2138                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2139                                     pinfo->prefix_len);
2140                 in6_dev_put(in6_dev);
2141                 return;
2142
2143 ok:
2144
2145                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2146
2147                 if (ifp == NULL && valid_lft) {
2148                         int max_addresses = in6_dev->cnf.max_addresses;
2149                         u32 addr_flags = 0;
2150
2151 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2152                         if (in6_dev->cnf.optimistic_dad &&
2153                             !net->ipv6.devconf_all->forwarding && sllao)
2154                                 addr_flags = IFA_F_OPTIMISTIC;
2155 #endif
2156
2157                         /* Do not allow to create too much of autoconfigured
2158                          * addresses; this would be too easy way to crash kernel.
2159                          */
2160                         if (!max_addresses ||
2161                             ipv6_count_addresses(in6_dev) < max_addresses)
2162                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2163                                                     pinfo->prefix_len,
2164                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2165                                                     addr_flags, valid_lft,
2166                                                     prefered_lft);
2167
2168                         if (IS_ERR_OR_NULL(ifp)) {
2169                                 in6_dev_put(in6_dev);
2170                                 return;
2171                         }
2172
2173                         update_lft = 0;
2174                         create = 1;
2175                         ifp->cstamp = jiffies;
2176                         ifp->tokenized = tokenized;
2177                         addrconf_dad_start(ifp);
2178                 }
2179
2180                 if (ifp) {
2181                         int flags;
2182                         unsigned long now;
2183                         struct inet6_ifaddr *ift;
2184                         u32 stored_lft;
2185
2186                         /* update lifetime (RFC2462 5.5.3 e) */
2187                         spin_lock(&ifp->lock);
2188                         now = jiffies;
2189                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2190                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2191                         else
2192                                 stored_lft = 0;
2193                         if (!update_lft && !create && stored_lft) {
2194                                 const u32 minimum_lft = min(
2195                                         stored_lft, (u32)MIN_VALID_LIFETIME);
2196                                 valid_lft = max(valid_lft, minimum_lft);
2197
2198                                 /* RFC4862 Section 5.5.3e:
2199                                  * "Note that the preferred lifetime of the
2200                                  *  corresponding address is always reset to
2201                                  *  the Preferred Lifetime in the received
2202                                  *  Prefix Information option, regardless of
2203                                  *  whether the valid lifetime is also reset or
2204                                  *  ignored."
2205                                  *
2206                                  * So we should always update prefered_lft here.
2207                                  */
2208                                 update_lft = 1;
2209                         }
2210
2211                         if (update_lft) {
2212                                 ifp->valid_lft = valid_lft;
2213                                 ifp->prefered_lft = prefered_lft;
2214                                 ifp->tstamp = now;
2215                                 flags = ifp->flags;
2216                                 ifp->flags &= ~IFA_F_DEPRECATED;
2217                                 spin_unlock(&ifp->lock);
2218
2219                                 if (!(flags&IFA_F_TENTATIVE))
2220                                         ipv6_ifa_notify(0, ifp);
2221                         } else
2222                                 spin_unlock(&ifp->lock);
2223
2224                         read_lock_bh(&in6_dev->lock);
2225                         /* update all temporary addresses in the list */
2226                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2227                                             tmp_list) {
2228                                 int age, max_valid, max_prefered;
2229
2230                                 if (ifp != ift->ifpub)
2231                                         continue;
2232
2233                                 /*
2234                                  * RFC 4941 section 3.3:
2235                                  * If a received option will extend the lifetime
2236                                  * of a public address, the lifetimes of
2237                                  * temporary addresses should be extended,
2238                                  * subject to the overall constraint that no
2239                                  * temporary addresses should ever remain
2240                                  * "valid" or "preferred" for a time longer than
2241                                  * (TEMP_VALID_LIFETIME) or
2242                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2243                                  * respectively.
2244                                  */
2245                                 age = (now - ift->cstamp) / HZ;
2246                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2247                                 if (max_valid < 0)
2248                                         max_valid = 0;
2249
2250                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2251                                                in6_dev->cnf.max_desync_factor -
2252                                                age;
2253                                 if (max_prefered < 0)
2254                                         max_prefered = 0;
2255
2256                                 if (valid_lft > max_valid)
2257                                         valid_lft = max_valid;
2258
2259                                 if (prefered_lft > max_prefered)
2260                                         prefered_lft = max_prefered;
2261
2262                                 spin_lock(&ift->lock);
2263                                 flags = ift->flags;
2264                                 ift->valid_lft = valid_lft;
2265                                 ift->prefered_lft = prefered_lft;
2266                                 ift->tstamp = now;
2267                                 if (prefered_lft > 0)
2268                                         ift->flags &= ~IFA_F_DEPRECATED;
2269
2270                                 spin_unlock(&ift->lock);
2271                                 if (!(flags&IFA_F_TENTATIVE))
2272                                         ipv6_ifa_notify(0, ift);
2273                         }
2274
2275                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2276                                 /*
2277                                  * When a new public address is created as
2278                                  * described in [ADDRCONF], also create a new
2279                                  * temporary address. Also create a temporary
2280                                  * address if it's enabled but no temporary
2281                                  * address currently exists.
2282                                  */
2283                                 read_unlock_bh(&in6_dev->lock);
2284                                 ipv6_create_tempaddr(ifp, NULL);
2285                         } else {
2286                                 read_unlock_bh(&in6_dev->lock);
2287                         }
2288
2289                         in6_ifa_put(ifp);
2290                         addrconf_verify(0);
2291                 }
2292         }
2293         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2294         in6_dev_put(in6_dev);
2295 }
2296
2297 /*
2298  *      Set destination address.
2299  *      Special case for SIT interfaces where we create a new "virtual"
2300  *      device.
2301  */
2302 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2303 {
2304         struct in6_ifreq ireq;
2305         struct net_device *dev;
2306         int err = -EINVAL;
2307
2308         rtnl_lock();
2309
2310         err = -EFAULT;
2311         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2312                 goto err_exit;
2313
2314         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2315
2316         err = -ENODEV;
2317         if (dev == NULL)
2318                 goto err_exit;
2319
2320 #if IS_ENABLED(CONFIG_IPV6_SIT)
2321         if (dev->type == ARPHRD_SIT) {
2322                 const struct net_device_ops *ops = dev->netdev_ops;
2323                 struct ifreq ifr;
2324                 struct ip_tunnel_parm p;
2325
2326                 err = -EADDRNOTAVAIL;
2327                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2328                         goto err_exit;
2329
2330                 memset(&p, 0, sizeof(p));
2331                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2332                 p.iph.saddr = 0;
2333                 p.iph.version = 4;
2334                 p.iph.ihl = 5;
2335                 p.iph.protocol = IPPROTO_IPV6;
2336                 p.iph.ttl = 64;
2337                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2338
2339                 if (ops->ndo_do_ioctl) {
2340                         mm_segment_t oldfs = get_fs();
2341
2342                         set_fs(KERNEL_DS);
2343                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2344                         set_fs(oldfs);
2345                 } else
2346                         err = -EOPNOTSUPP;
2347
2348                 if (err == 0) {
2349                         err = -ENOBUFS;
2350                         dev = __dev_get_by_name(net, p.name);
2351                         if (!dev)
2352                                 goto err_exit;
2353                         err = dev_open(dev);
2354                 }
2355         }
2356 #endif
2357
2358 err_exit:
2359         rtnl_unlock();
2360         return err;
2361 }
2362
2363 /*
2364  *      Manual configuration of address on an interface
2365  */
2366 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2367                           const struct in6_addr *peer_pfx,
2368                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2369                           __u32 valid_lft)
2370 {
2371         struct inet6_ifaddr *ifp;
2372         struct inet6_dev *idev;
2373         struct net_device *dev;
2374         int scope;
2375         u32 flags;
2376         clock_t expires;
2377         unsigned long timeout;
2378
2379         ASSERT_RTNL();
2380
2381         if (plen > 128)
2382                 return -EINVAL;
2383
2384         /* check the lifetime */
2385         if (!valid_lft || prefered_lft > valid_lft)
2386                 return -EINVAL;
2387
2388         dev = __dev_get_by_index(net, ifindex);
2389         if (!dev)
2390                 return -ENODEV;
2391
2392         idev = addrconf_add_dev(dev);
2393         if (IS_ERR(idev))
2394                 return PTR_ERR(idev);
2395
2396         scope = ipv6_addr_scope(pfx);
2397
2398         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2399         if (addrconf_finite_timeout(timeout)) {
2400                 expires = jiffies_to_clock_t(timeout * HZ);
2401                 valid_lft = timeout;
2402                 flags = RTF_EXPIRES;
2403         } else {
2404                 expires = 0;
2405                 flags = 0;
2406                 ifa_flags |= IFA_F_PERMANENT;
2407         }
2408
2409         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2410         if (addrconf_finite_timeout(timeout)) {
2411                 if (timeout == 0)
2412                         ifa_flags |= IFA_F_DEPRECATED;
2413                 prefered_lft = timeout;
2414         }
2415
2416         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2417                             valid_lft, prefered_lft);
2418
2419         if (!IS_ERR(ifp)) {
2420                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2421                                       expires, flags);
2422                 /*
2423                  * Note that section 3.1 of RFC 4429 indicates
2424                  * that the Optimistic flag should not be set for
2425                  * manually configured addresses
2426                  */
2427                 addrconf_dad_start(ifp);
2428                 in6_ifa_put(ifp);
2429                 addrconf_verify(0);
2430                 return 0;
2431         }
2432
2433         return PTR_ERR(ifp);
2434 }
2435
2436 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2437                           unsigned int plen)
2438 {
2439         struct inet6_ifaddr *ifp;
2440         struct inet6_dev *idev;
2441         struct net_device *dev;
2442
2443         if (plen > 128)
2444                 return -EINVAL;
2445
2446         dev = __dev_get_by_index(net, ifindex);
2447         if (!dev)
2448                 return -ENODEV;
2449
2450         if ((idev = __in6_dev_get(dev)) == NULL)
2451                 return -ENXIO;
2452
2453         read_lock_bh(&idev->lock);
2454         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2455                 if (ifp->prefix_len == plen &&
2456                     ipv6_addr_equal(pfx, &ifp->addr)) {
2457                         in6_ifa_hold(ifp);
2458                         read_unlock_bh(&idev->lock);
2459
2460                         ipv6_del_addr(ifp);
2461                         return 0;
2462                 }
2463         }
2464         read_unlock_bh(&idev->lock);
2465         return -EADDRNOTAVAIL;
2466 }
2467
2468
2469 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2470 {
2471         struct in6_ifreq ireq;
2472         int err;
2473
2474         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2475                 return -EPERM;
2476
2477         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2478                 return -EFAULT;
2479
2480         rtnl_lock();
2481         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2482                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2483                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2484         rtnl_unlock();
2485         return err;
2486 }
2487
2488 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2489 {
2490         struct in6_ifreq ireq;
2491         int err;
2492
2493         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2494                 return -EPERM;
2495
2496         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2497                 return -EFAULT;
2498
2499         rtnl_lock();
2500         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2501                              ireq.ifr6_prefixlen);
2502         rtnl_unlock();
2503         return err;
2504 }
2505
2506 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2507                      int plen, int scope)
2508 {
2509         struct inet6_ifaddr *ifp;
2510
2511         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2512                             scope, IFA_F_PERMANENT,
2513                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2514         if (!IS_ERR(ifp)) {
2515                 spin_lock_bh(&ifp->lock);
2516                 ifp->flags &= ~IFA_F_TENTATIVE;
2517                 spin_unlock_bh(&ifp->lock);
2518                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2519                 in6_ifa_put(ifp);
2520         }
2521 }
2522
2523 #if IS_ENABLED(CONFIG_IPV6_SIT)
2524 static void sit_add_v4_addrs(struct inet6_dev *idev)
2525 {
2526         struct in6_addr addr;
2527         struct net_device *dev;
2528         struct net *net = dev_net(idev->dev);
2529         int scope, plen;
2530         u32 pflags = 0;
2531
2532         ASSERT_RTNL();
2533
2534         memset(&addr, 0, sizeof(struct in6_addr));
2535         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2536
2537         if (idev->dev->flags&IFF_POINTOPOINT) {
2538                 addr.s6_addr32[0] = htonl(0xfe800000);
2539                 scope = IFA_LINK;
2540                 plen = 64;
2541         } else {
2542                 scope = IPV6_ADDR_COMPATv4;
2543                 plen = 96;
2544                 pflags |= RTF_NONEXTHOP;
2545         }
2546
2547         if (addr.s6_addr32[3]) {
2548                 add_addr(idev, &addr, plen, scope);
2549                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2550                 return;
2551         }
2552
2553         for_each_netdev(net, dev) {
2554                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2555                 if (in_dev && (dev->flags & IFF_UP)) {
2556                         struct in_ifaddr *ifa;
2557
2558                         int flag = scope;
2559
2560                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2561
2562                                 addr.s6_addr32[3] = ifa->ifa_local;
2563
2564                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2565                                         continue;
2566                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2567                                         if (idev->dev->flags&IFF_POINTOPOINT)
2568                                                 continue;
2569                                         flag |= IFA_HOST;
2570                                 }
2571
2572                                 add_addr(idev, &addr, plen, flag);
2573                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2574                                                       pflags);
2575                         }
2576                 }
2577         }
2578 }
2579 #endif
2580
2581 static void init_loopback(struct net_device *dev)
2582 {
2583         struct inet6_dev  *idev;
2584         struct net_device *sp_dev;
2585         struct inet6_ifaddr *sp_ifa;
2586         struct rt6_info *sp_rt;
2587
2588         /* ::1 */
2589
2590         ASSERT_RTNL();
2591
2592         if ((idev = ipv6_find_idev(dev)) == NULL) {
2593                 pr_debug("%s: add_dev failed\n", __func__);
2594                 return;
2595         }
2596
2597         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2598
2599         /* Add routes to other interface's IPv6 addresses */
2600         for_each_netdev(dev_net(dev), sp_dev) {
2601                 if (!strcmp(sp_dev->name, dev->name))
2602                         continue;
2603
2604                 idev = __in6_dev_get(sp_dev);
2605                 if (!idev)
2606                         continue;
2607
2608                 read_lock_bh(&idev->lock);
2609                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2610
2611                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2612                                 continue;
2613
2614                         if (sp_ifa->rt)
2615                                 continue;
2616
2617                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2618
2619                         /* Failure cases are ignored */
2620                         if (!IS_ERR(sp_rt)) {
2621                                 sp_ifa->rt = sp_rt;
2622                                 ip6_ins_rt(sp_rt);
2623                         }
2624                 }
2625                 read_unlock_bh(&idev->lock);
2626         }
2627 }
2628
2629 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2630 {
2631         struct inet6_ifaddr *ifp;
2632         u32 addr_flags = IFA_F_PERMANENT;
2633
2634 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2635         if (idev->cnf.optimistic_dad &&
2636             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2637                 addr_flags |= IFA_F_OPTIMISTIC;
2638 #endif
2639
2640
2641         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2642                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2643         if (!IS_ERR(ifp)) {
2644                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2645                 addrconf_dad_start(ifp);
2646                 in6_ifa_put(ifp);
2647         }
2648 }
2649
2650 static void addrconf_dev_config(struct net_device *dev)
2651 {
2652         struct in6_addr addr;
2653         struct inet6_dev *idev;
2654
2655         ASSERT_RTNL();
2656
2657         if ((dev->type != ARPHRD_ETHER) &&
2658             (dev->type != ARPHRD_FDDI) &&
2659             (dev->type != ARPHRD_ARCNET) &&
2660             (dev->type != ARPHRD_INFINIBAND) &&
2661             (dev->type != ARPHRD_IEEE802154) &&
2662             (dev->type != ARPHRD_IEEE1394) &&
2663             (dev->type != ARPHRD_TUNNEL6)) {
2664                 /* Alas, we support only Ethernet autoconfiguration. */
2665                 return;
2666         }
2667
2668         idev = addrconf_add_dev(dev);
2669         if (IS_ERR(idev))
2670                 return;
2671
2672         memset(&addr, 0, sizeof(struct in6_addr));
2673         addr.s6_addr32[0] = htonl(0xFE800000);
2674
2675         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2676                 addrconf_add_linklocal(idev, &addr);
2677 }
2678
2679 #if IS_ENABLED(CONFIG_IPV6_SIT)
2680 static void addrconf_sit_config(struct net_device *dev)
2681 {
2682         struct inet6_dev *idev;
2683
2684         ASSERT_RTNL();
2685
2686         /*
2687          * Configure the tunnel with one of our IPv4
2688          * addresses... we should configure all of
2689          * our v4 addrs in the tunnel
2690          */
2691
2692         if ((idev = ipv6_find_idev(dev)) == NULL) {
2693                 pr_debug("%s: add_dev failed\n", __func__);
2694                 return;
2695         }
2696
2697         if (dev->priv_flags & IFF_ISATAP) {
2698                 struct in6_addr addr;
2699
2700                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2701                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2702                         addrconf_add_linklocal(idev, &addr);
2703                 return;
2704         }
2705
2706         sit_add_v4_addrs(idev);
2707
2708         if (dev->flags&IFF_POINTOPOINT)
2709                 addrconf_add_mroute(dev);
2710 }
2711 #endif
2712
2713 #if IS_ENABLED(CONFIG_NET_IPGRE)
2714 static void addrconf_gre_config(struct net_device *dev)
2715 {
2716         struct inet6_dev *idev;
2717         struct in6_addr addr;
2718
2719         ASSERT_RTNL();
2720
2721         if ((idev = ipv6_find_idev(dev)) == NULL) {
2722                 pr_debug("%s: add_dev failed\n", __func__);
2723                 return;
2724         }
2725
2726         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2727         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2728                 addrconf_add_linklocal(idev, &addr);
2729 }
2730 #endif
2731
2732 static inline int
2733 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2734 {
2735         struct in6_addr lladdr;
2736
2737         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2738                 addrconf_add_linklocal(idev, &lladdr);
2739                 return 0;
2740         }
2741         return -1;
2742 }
2743
2744 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2745                            void *ptr)
2746 {
2747         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2748         struct inet6_dev *idev = __in6_dev_get(dev);
2749         int run_pending = 0;
2750         int err;
2751
2752         switch (event) {
2753         case NETDEV_REGISTER:
2754                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2755                         idev = ipv6_add_dev(dev);
2756                         if (!idev)
2757                                 return notifier_from_errno(-ENOMEM);
2758                 }
2759                 break;
2760
2761         case NETDEV_UP:
2762         case NETDEV_CHANGE:
2763                 if (dev->flags & IFF_SLAVE)
2764                         break;
2765
2766                 if (event == NETDEV_UP) {
2767                         if (!addrconf_qdisc_ok(dev)) {
2768                                 /* device is not ready yet. */
2769                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2770                                         dev->name);
2771                                 break;
2772                         }
2773
2774                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2775                                 idev = ipv6_add_dev(dev);
2776
2777                         if (idev) {
2778                                 idev->if_flags |= IF_READY;
2779                                 run_pending = 1;
2780                         }
2781                 } else {
2782                         if (!addrconf_qdisc_ok(dev)) {
2783                                 /* device is still not ready. */
2784                                 break;
2785                         }
2786
2787                         if (idev) {
2788                                 if (idev->if_flags & IF_READY)
2789                                         /* device is already configured. */
2790                                         break;
2791                                 idev->if_flags |= IF_READY;
2792                         }
2793
2794                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2795                                 dev->name);
2796
2797                         run_pending = 1;
2798                 }
2799
2800                 switch (dev->type) {
2801 #if IS_ENABLED(CONFIG_IPV6_SIT)
2802                 case ARPHRD_SIT:
2803                         addrconf_sit_config(dev);
2804                         break;
2805 #endif
2806 #if IS_ENABLED(CONFIG_NET_IPGRE)
2807                 case ARPHRD_IPGRE:
2808                         addrconf_gre_config(dev);
2809                         break;
2810 #endif
2811                 case ARPHRD_LOOPBACK:
2812                         init_loopback(dev);
2813                         break;
2814
2815                 default:
2816                         addrconf_dev_config(dev);
2817                         break;
2818                 }
2819
2820                 if (idev) {
2821                         if (run_pending)
2822                                 addrconf_dad_run(idev);
2823
2824                         /*
2825                          * If the MTU changed during the interface down,
2826                          * when the interface up, the changed MTU must be
2827                          * reflected in the idev as well as routers.
2828                          */
2829                         if (idev->cnf.mtu6 != dev->mtu &&
2830                             dev->mtu >= IPV6_MIN_MTU) {
2831                                 rt6_mtu_change(dev, dev->mtu);
2832                                 idev->cnf.mtu6 = dev->mtu;
2833                         }
2834                         idev->tstamp = jiffies;
2835                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2836
2837                         /*
2838                          * If the changed mtu during down is lower than
2839                          * IPV6_MIN_MTU stop IPv6 on this interface.
2840                          */
2841                         if (dev->mtu < IPV6_MIN_MTU)
2842                                 addrconf_ifdown(dev, 1);
2843                 }
2844                 break;
2845
2846         case NETDEV_CHANGEMTU:
2847                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2848                         rt6_mtu_change(dev, dev->mtu);
2849                         idev->cnf.mtu6 = dev->mtu;
2850                         break;
2851                 }
2852
2853                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2854                         idev = ipv6_add_dev(dev);
2855                         if (idev)
2856                                 break;
2857                 }
2858
2859                 /*
2860                  * MTU falled under IPV6_MIN_MTU.
2861                  * Stop IPv6 on this interface.
2862                  */
2863
2864         case NETDEV_DOWN:
2865         case NETDEV_UNREGISTER:
2866                 /*
2867                  *      Remove all addresses from this interface.
2868                  */
2869                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2870                 break;
2871
2872         case NETDEV_CHANGENAME:
2873                 if (idev) {
2874                         snmp6_unregister_dev(idev);
2875                         addrconf_sysctl_unregister(idev);
2876                         addrconf_sysctl_register(idev);
2877                         err = snmp6_register_dev(idev);
2878                         if (err)
2879                                 return notifier_from_errno(err);
2880                 }
2881                 break;
2882
2883         case NETDEV_PRE_TYPE_CHANGE:
2884         case NETDEV_POST_TYPE_CHANGE:
2885                 addrconf_type_change(dev, event);
2886                 break;
2887         }
2888
2889         return NOTIFY_OK;
2890 }
2891
2892 /*
2893  *      addrconf module should be notified of a device going up
2894  */
2895 static struct notifier_block ipv6_dev_notf = {
2896         .notifier_call = addrconf_notify,
2897 };
2898
2899 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2900 {
2901         struct inet6_dev *idev;
2902         ASSERT_RTNL();
2903
2904         idev = __in6_dev_get(dev);
2905
2906         if (event == NETDEV_POST_TYPE_CHANGE)
2907                 ipv6_mc_remap(idev);
2908         else if (event == NETDEV_PRE_TYPE_CHANGE)
2909                 ipv6_mc_unmap(idev);
2910 }
2911
2912 static int addrconf_ifdown(struct net_device *dev, int how)
2913 {
2914         struct net *net = dev_net(dev);
2915         struct inet6_dev *idev;
2916         struct inet6_ifaddr *ifa;
2917         int state, i;
2918
2919         ASSERT_RTNL();
2920
2921         rt6_ifdown(net, dev);
2922         neigh_ifdown(&nd_tbl, dev);
2923
2924         idev = __in6_dev_get(dev);
2925         if (idev == NULL)
2926                 return -ENODEV;
2927
2928         /*
2929          * Step 1: remove reference to ipv6 device from parent device.
2930          *         Do not dev_put!
2931          */
2932         if (how) {
2933                 idev->dead = 1;
2934
2935                 /* protected by rtnl_lock */
2936                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2937
2938                 /* Step 1.5: remove snmp6 entry */
2939                 snmp6_unregister_dev(idev);
2940
2941         }
2942
2943         /* Step 2: clear hash table */
2944         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2945                 struct hlist_head *h = &inet6_addr_lst[i];
2946
2947                 spin_lock_bh(&addrconf_hash_lock);
2948         restart:
2949                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2950                         if (ifa->idev == idev) {
2951                                 hlist_del_init_rcu(&ifa->addr_lst);
2952                                 addrconf_del_dad_timer(ifa);
2953                                 goto restart;
2954                         }
2955                 }
2956                 spin_unlock_bh(&addrconf_hash_lock);
2957         }
2958
2959         write_lock_bh(&idev->lock);
2960
2961         addrconf_del_rs_timer(idev);
2962
2963         /* Step 2: clear flags for stateless addrconf */
2964         if (!how)
2965                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2966
2967         if (how && del_timer(&idev->regen_timer))
2968                 in6_dev_put(idev);
2969
2970         /* Step 3: clear tempaddr list */
2971         while (!list_empty(&idev->tempaddr_list)) {
2972                 ifa = list_first_entry(&idev->tempaddr_list,
2973                                        struct inet6_ifaddr, tmp_list);
2974                 list_del(&ifa->tmp_list);
2975                 write_unlock_bh(&idev->lock);
2976                 spin_lock_bh(&ifa->lock);
2977
2978                 if (ifa->ifpub) {
2979                         in6_ifa_put(ifa->ifpub);
2980                         ifa->ifpub = NULL;
2981                 }
2982                 spin_unlock_bh(&ifa->lock);
2983                 in6_ifa_put(ifa);
2984                 write_lock_bh(&idev->lock);
2985         }
2986
2987         while (!list_empty(&idev->addr_list)) {
2988                 ifa = list_first_entry(&idev->addr_list,
2989                                        struct inet6_ifaddr, if_list);
2990                 addrconf_del_dad_timer(ifa);
2991
2992                 list_del(&ifa->if_list);
2993
2994                 write_unlock_bh(&idev->lock);
2995
2996                 spin_lock_bh(&ifa->state_lock);
2997                 state = ifa->state;
2998                 ifa->state = INET6_IFADDR_STATE_DEAD;
2999                 spin_unlock_bh(&ifa->state_lock);
3000
3001                 if (state != INET6_IFADDR_STATE_DEAD) {
3002                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3003                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3004                 }
3005                 in6_ifa_put(ifa);
3006
3007                 write_lock_bh(&idev->lock);
3008         }
3009
3010         write_unlock_bh(&idev->lock);
3011
3012         /* Step 5: Discard multicast list */
3013         if (how)
3014                 ipv6_mc_destroy_dev(idev);
3015         else
3016                 ipv6_mc_down(idev);
3017
3018         idev->tstamp = jiffies;
3019
3020         /* Last: Shot the device (if unregistered) */
3021         if (how) {
3022                 addrconf_sysctl_unregister(idev);
3023                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3024                 neigh_ifdown(&nd_tbl, dev);
3025                 in6_dev_put(idev);
3026         }
3027         return 0;
3028 }
3029
3030 static void addrconf_rs_timer(unsigned long data)
3031 {
3032         struct inet6_dev *idev = (struct inet6_dev *)data;
3033         struct net_device *dev = idev->dev;
3034         struct in6_addr lladdr;
3035
3036         write_lock(&idev->lock);
3037         if (idev->dead || !(idev->if_flags & IF_READY))
3038                 goto out;
3039
3040         if (!ipv6_accept_ra(idev))
3041                 goto out;
3042
3043         /* Announcement received after solicitation was sent */
3044         if (idev->if_flags & IF_RA_RCVD)
3045                 goto out;
3046
3047         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3048                 write_unlock(&idev->lock);
3049                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3050                         ndisc_send_rs(dev, &lladdr,
3051                                       &in6addr_linklocal_allrouters);
3052                 else
3053                         goto put;
3054
3055                 write_lock(&idev->lock);
3056                 /* The wait after the last probe can be shorter */
3057                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3058                                              idev->cnf.rtr_solicits) ?
3059                                       idev->cnf.rtr_solicit_delay :
3060                                       idev->cnf.rtr_solicit_interval);
3061         } else {
3062                 /*
3063                  * Note: we do not support deprecated "all on-link"
3064                  * assumption any longer.
3065                  */
3066                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3067         }
3068
3069 out:
3070         write_unlock(&idev->lock);
3071 put:
3072         in6_dev_put(idev);
3073 }
3074
3075 /*
3076  *      Duplicate Address Detection
3077  */
3078 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3079 {
3080         unsigned long rand_num;
3081         struct inet6_dev *idev = ifp->idev;
3082
3083         if (ifp->flags & IFA_F_OPTIMISTIC)
3084                 rand_num = 0;
3085         else
3086                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3087
3088         ifp->dad_probes = idev->cnf.dad_transmits;
3089         addrconf_mod_dad_timer(ifp, rand_num);
3090 }
3091
3092 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3093 {
3094         struct inet6_dev *idev = ifp->idev;
3095         struct net_device *dev = idev->dev;
3096
3097         addrconf_join_solict(dev, &ifp->addr);
3098
3099         net_srandom(ifp->addr.s6_addr32[3]);
3100
3101         read_lock_bh(&idev->lock);
3102         spin_lock(&ifp->lock);
3103         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3104                 goto out;
3105
3106         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3107             idev->cnf.accept_dad < 1 ||
3108             !(ifp->flags&IFA_F_TENTATIVE) ||
3109             ifp->flags & IFA_F_NODAD) {
3110                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3111                 spin_unlock(&ifp->lock);
3112                 read_unlock_bh(&idev->lock);
3113
3114                 addrconf_dad_completed(ifp);
3115                 return;
3116         }
3117
3118         if (!(idev->if_flags & IF_READY)) {
3119                 spin_unlock(&ifp->lock);
3120                 read_unlock_bh(&idev->lock);
3121                 /*
3122                  * If the device is not ready:
3123                  * - keep it tentative if it is a permanent address.
3124                  * - otherwise, kill it.
3125                  */
3126                 in6_ifa_hold(ifp);
3127                 addrconf_dad_stop(ifp, 0);
3128                 return;
3129         }
3130
3131         /*
3132          * Optimistic nodes can start receiving
3133          * Frames right away
3134          */
3135         if (ifp->flags & IFA_F_OPTIMISTIC)
3136                 ip6_ins_rt(ifp->rt);
3137
3138         addrconf_dad_kick(ifp);
3139 out:
3140         spin_unlock(&ifp->lock);
3141         read_unlock_bh(&idev->lock);
3142 }
3143
3144 static void addrconf_dad_timer(unsigned long data)
3145 {
3146         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3147         struct inet6_dev *idev = ifp->idev;
3148         struct in6_addr mcaddr;
3149
3150         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3151                 goto out;
3152
3153         write_lock(&idev->lock);
3154         if (idev->dead || !(idev->if_flags & IF_READY)) {
3155                 write_unlock(&idev->lock);
3156                 goto out;
3157         }
3158
3159         spin_lock(&ifp->lock);
3160         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3161                 spin_unlock(&ifp->lock);
3162                 write_unlock(&idev->lock);
3163                 goto out;
3164         }
3165
3166         if (ifp->dad_probes == 0) {
3167                 /*
3168                  * DAD was successful
3169                  */
3170
3171                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3172                 spin_unlock(&ifp->lock);
3173                 write_unlock(&idev->lock);
3174
3175                 addrconf_dad_completed(ifp);
3176
3177                 goto out;
3178         }
3179
3180         ifp->dad_probes--;
3181         addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3182         spin_unlock(&ifp->lock);
3183         write_unlock(&idev->lock);
3184
3185         /* send a neighbour solicitation for our addr */
3186         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3187         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3188 out:
3189         in6_ifa_put(ifp);
3190 }
3191
3192 /* ifp->idev must be at least read locked */
3193 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3194 {
3195         struct inet6_ifaddr *ifpiter;
3196         struct inet6_dev *idev = ifp->idev;
3197
3198         list_for_each_entry(ifpiter, &idev->addr_list, if_list) {
3199                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3200                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3201                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3202                     IFA_F_PERMANENT)
3203                         return false;
3204         }
3205         return true;
3206 }
3207
3208 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3209 {
3210         struct net_device *dev = ifp->idev->dev;
3211         struct in6_addr lladdr;
3212         bool send_rs, send_mld;
3213
3214         addrconf_del_dad_timer(ifp);
3215
3216         /*
3217          *      Configure the address for reception. Now it is valid.
3218          */
3219
3220         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3221
3222         /* If added prefix is link local and we are prepared to process
3223            router advertisements, start sending router solicitations.
3224          */
3225
3226         read_lock_bh(&ifp->idev->lock);
3227         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3228         send_rs = send_mld &&
3229                   ipv6_accept_ra(ifp->idev) &&
3230                   ifp->idev->cnf.rtr_solicits > 0 &&
3231                   (dev->flags&IFF_LOOPBACK) == 0;
3232         read_unlock_bh(&ifp->idev->lock);
3233
3234         /* While dad is in progress mld report's source address is in6_addrany.
3235          * Resend with proper ll now.
3236          */
3237         if (send_mld)
3238                 ipv6_mc_dad_complete(ifp->idev);
3239
3240         if (send_rs) {
3241                 /*
3242                  *      If a host as already performed a random delay
3243                  *      [...] as part of DAD [...] there is no need
3244                  *      to delay again before sending the first RS
3245                  */
3246                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3247                         return;
3248                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3249
3250                 write_lock_bh(&ifp->idev->lock);
3251                 spin_lock(&ifp->lock);
3252                 ifp->idev->rs_probes = 1;
3253                 ifp->idev->if_flags |= IF_RS_SENT;
3254                 addrconf_mod_rs_timer(ifp->idev,
3255                                       ifp->idev->cnf.rtr_solicit_interval);
3256                 spin_unlock(&ifp->lock);
3257                 write_unlock_bh(&ifp->idev->lock);
3258         }
3259 }
3260
3261 static void addrconf_dad_run(struct inet6_dev *idev)
3262 {
3263         struct inet6_ifaddr *ifp;
3264
3265         read_lock_bh(&idev->lock);
3266         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3267                 spin_lock(&ifp->lock);
3268                 if (ifp->flags & IFA_F_TENTATIVE &&
3269                     ifp->state == INET6_IFADDR_STATE_DAD)
3270                         addrconf_dad_kick(ifp);
3271                 spin_unlock(&ifp->lock);
3272         }
3273         read_unlock_bh(&idev->lock);
3274 }
3275
3276 #ifdef CONFIG_PROC_FS
3277 struct if6_iter_state {
3278         struct seq_net_private p;
3279         int bucket;
3280         int offset;
3281 };
3282
3283 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3284 {
3285         struct inet6_ifaddr *ifa = NULL;
3286         struct if6_iter_state *state = seq->private;
3287         struct net *net = seq_file_net(seq);
3288         int p = 0;
3289
3290         /* initial bucket if pos is 0 */
3291         if (pos == 0) {
3292                 state->bucket = 0;
3293                 state->offset = 0;
3294         }
3295
3296         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3297                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3298                                          addr_lst) {
3299                         if (!net_eq(dev_net(ifa->idev->dev), net))
3300                                 continue;
3301                         /* sync with offset */
3302                         if (p < state->offset) {
3303                                 p++;
3304                                 continue;
3305                         }
3306                         state->offset++;
3307                         return ifa;
3308                 }
3309
3310                 /* prepare for next bucket */
3311                 state->offset = 0;
3312                 p = 0;
3313         }
3314         return NULL;
3315 }
3316
3317 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3318                                          struct inet6_ifaddr *ifa)
3319 {
3320         struct if6_iter_state *state = seq->private;
3321         struct net *net = seq_file_net(seq);
3322
3323         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3324                 if (!net_eq(dev_net(ifa->idev->dev), net))
3325                         continue;
3326                 state->offset++;
3327                 return ifa;
3328         }
3329
3330         while (++state->bucket < IN6_ADDR_HSIZE) {
3331                 state->offset = 0;
3332                 hlist_for_each_entry_rcu_bh(ifa,
3333                                      &inet6_addr_lst[state->bucket], addr_lst) {
3334                         if (!net_eq(dev_net(ifa->idev->dev), net))
3335                                 continue;
3336                         state->offset++;
3337                         return ifa;
3338                 }
3339         }
3340
3341         return NULL;
3342 }
3343
3344 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3345         __acquires(rcu_bh)
3346 {
3347         rcu_read_lock_bh();
3348         return if6_get_first(seq, *pos);
3349 }
3350
3351 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3352 {
3353         struct inet6_ifaddr *ifa;
3354
3355         ifa = if6_get_next(seq, v);
3356         ++*pos;
3357         return ifa;
3358 }
3359
3360 static void if6_seq_stop(struct seq_file *seq, void *v)
3361         __releases(rcu_bh)
3362 {
3363         rcu_read_unlock_bh();
3364 }
3365
3366 static int if6_seq_show(struct seq_file *seq, void *v)
3367 {
3368         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3369         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3370                    &ifp->addr,
3371                    ifp->idev->dev->ifindex,
3372                    ifp->prefix_len,
3373                    ifp->scope,
3374                    ifp->flags,
3375                    ifp->idev->dev->name);
3376         return 0;
3377 }
3378
3379 static const struct seq_operations if6_seq_ops = {
3380         .start  = if6_seq_start,
3381         .next   = if6_seq_next,
3382         .show   = if6_seq_show,
3383         .stop   = if6_seq_stop,
3384 };
3385
3386 static int if6_seq_open(struct inode *inode, struct file *file)
3387 {
3388         return seq_open_net(inode, file, &if6_seq_ops,
3389                             sizeof(struct if6_iter_state));
3390 }
3391
3392 static const struct file_operations if6_fops = {
3393         .owner          = THIS_MODULE,
3394         .open           = if6_seq_open,
3395         .read           = seq_read,
3396         .llseek         = seq_lseek,
3397         .release        = seq_release_net,
3398 };
3399
3400 static int __net_init if6_proc_net_init(struct net *net)
3401 {
3402         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3403                 return -ENOMEM;
3404         return 0;
3405 }
3406
3407 static void __net_exit if6_proc_net_exit(struct net *net)
3408 {
3409         remove_proc_entry("if_inet6", net->proc_net);
3410 }
3411
3412 static struct pernet_operations if6_proc_net_ops = {
3413        .init = if6_proc_net_init,
3414        .exit = if6_proc_net_exit,
3415 };
3416
3417 int __init if6_proc_init(void)
3418 {
3419         return register_pernet_subsys(&if6_proc_net_ops);
3420 }
3421
3422 void if6_proc_exit(void)
3423 {
3424         unregister_pernet_subsys(&if6_proc_net_ops);
3425 }
3426 #endif  /* CONFIG_PROC_FS */
3427
3428 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3429 /* Check if address is a home address configured on any interface. */
3430 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3431 {
3432         int ret = 0;
3433         struct inet6_ifaddr *ifp = NULL;
3434         unsigned int hash = inet6_addr_hash(addr);
3435
3436         rcu_read_lock_bh();
3437         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3438                 if (!net_eq(dev_net(ifp->idev->dev), net))
3439                         continue;
3440                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3441                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3442                         ret = 1;
3443                         break;
3444                 }
3445         }
3446         rcu_read_unlock_bh();
3447         return ret;
3448 }
3449 #endif
3450
3451 /*
3452  *      Periodic address status verification
3453  */
3454
3455 static void addrconf_verify(unsigned long foo)
3456 {
3457         unsigned long now, next, next_sec, next_sched;
3458         struct inet6_ifaddr *ifp;
3459         int i;
3460
3461         rcu_read_lock_bh();
3462         spin_lock(&addrconf_verify_lock);
3463         now = jiffies;
3464         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3465
3466         del_timer(&addr_chk_timer);
3467
3468         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3469 restart:
3470                 hlist_for_each_entry_rcu_bh(ifp,
3471                                          &inet6_addr_lst[i], addr_lst) {
3472                         unsigned long age;
3473
3474                         /* When setting preferred_lft to a value not zero or
3475                          * infinity, while valid_lft is infinity
3476                          * IFA_F_PERMANENT has a non-infinity life time.
3477                          */
3478                         if ((ifp->flags & IFA_F_PERMANENT) &&
3479                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
3480                                 continue;
3481
3482                         spin_lock(&ifp->lock);
3483                         /* We try to batch several events at once. */
3484                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3485
3486                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3487                             age >= ifp->valid_lft) {
3488                                 spin_unlock(&ifp->lock);
3489                                 in6_ifa_hold(ifp);
3490                                 ipv6_del_addr(ifp);
3491                                 goto restart;
3492                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3493                                 spin_unlock(&ifp->lock);
3494                                 continue;
3495                         } else if (age >= ifp->prefered_lft) {
3496                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3497                                 int deprecate = 0;
3498
3499                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3500                                         deprecate = 1;
3501                                         ifp->flags |= IFA_F_DEPRECATED;
3502                                 }
3503
3504                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3505                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3506                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3507
3508                                 spin_unlock(&ifp->lock);
3509
3510                                 if (deprecate) {
3511                                         in6_ifa_hold(ifp);
3512
3513                                         ipv6_ifa_notify(0, ifp);
3514                                         in6_ifa_put(ifp);
3515                                         goto restart;
3516                                 }
3517                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3518                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3519                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3520                                         ifp->idev->cnf.dad_transmits *
3521                                         ifp->idev->nd_parms->retrans_time / HZ;
3522
3523                                 if (age >= ifp->prefered_lft - regen_advance) {
3524                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3525                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3526                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3527                                         if (!ifp->regen_count && ifpub) {
3528                                                 ifp->regen_count++;
3529                                                 in6_ifa_hold(ifp);
3530                                                 in6_ifa_hold(ifpub);
3531                                                 spin_unlock(&ifp->lock);
3532
3533                                                 spin_lock(&ifpub->lock);
3534                                                 ifpub->regen_count = 0;
3535                                                 spin_unlock(&ifpub->lock);
3536                                                 ipv6_create_tempaddr(ifpub, ifp);
3537                                                 in6_ifa_put(ifpub);
3538                                                 in6_ifa_put(ifp);
3539                                                 goto restart;
3540                                         }
3541                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3542                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3543                                 spin_unlock(&ifp->lock);
3544                         } else {
3545                                 /* ifp->prefered_lft <= ifp->valid_lft */
3546                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3547                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3548                                 spin_unlock(&ifp->lock);
3549                         }
3550                 }
3551         }
3552
3553         next_sec = round_jiffies_up(next);
3554         next_sched = next;
3555
3556         /* If rounded timeout is accurate enough, accept it. */
3557         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3558                 next_sched = next_sec;
3559
3560         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3561         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3562                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3563
3564         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3565               now, next, next_sec, next_sched);
3566
3567         addr_chk_timer.expires = next_sched;
3568         add_timer(&addr_chk_timer);
3569         spin_unlock(&addrconf_verify_lock);
3570         rcu_read_unlock_bh();
3571 }
3572
3573 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3574                                      struct in6_addr **peer_pfx)
3575 {
3576         struct in6_addr *pfx = NULL;
3577
3578         *peer_pfx = NULL;
3579
3580         if (addr)
3581                 pfx = nla_data(addr);
3582
3583         if (local) {
3584                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3585                         *peer_pfx = pfx;
3586                 pfx = nla_data(local);
3587         }
3588
3589         return pfx;
3590 }
3591
3592 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3593         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3594         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3595         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3596 };
3597
3598 static int
3599 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3600 {
3601         struct net *net = sock_net(skb->sk);
3602         struct ifaddrmsg *ifm;
3603         struct nlattr *tb[IFA_MAX+1];
3604         struct in6_addr *pfx, *peer_pfx;
3605         int err;
3606
3607         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3608         if (err < 0)
3609                 return err;
3610
3611         ifm = nlmsg_data(nlh);
3612         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3613         if (pfx == NULL)
3614                 return -EINVAL;
3615
3616         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3617 }
3618
3619 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3620                              u32 prefered_lft, u32 valid_lft)
3621 {
3622         u32 flags;
3623         clock_t expires;
3624         unsigned long timeout;
3625
3626         if (!valid_lft || (prefered_lft > valid_lft))
3627                 return -EINVAL;
3628
3629         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3630         if (addrconf_finite_timeout(timeout)) {
3631                 expires = jiffies_to_clock_t(timeout * HZ);
3632                 valid_lft = timeout;
3633                 flags = RTF_EXPIRES;
3634         } else {
3635                 expires = 0;
3636                 flags = 0;
3637                 ifa_flags |= IFA_F_PERMANENT;
3638         }
3639
3640         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3641         if (addrconf_finite_timeout(timeout)) {
3642                 if (timeout == 0)
3643                         ifa_flags |= IFA_F_DEPRECATED;
3644                 prefered_lft = timeout;
3645         }
3646
3647         spin_lock_bh(&ifp->lock);
3648         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3649         ifp->tstamp = jiffies;
3650         ifp->valid_lft = valid_lft;
3651         ifp->prefered_lft = prefered_lft;
3652
3653         spin_unlock_bh(&ifp->lock);
3654         if (!(ifp->flags&IFA_F_TENTATIVE))
3655                 ipv6_ifa_notify(0, ifp);
3656
3657         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3658                               expires, flags);
3659         addrconf_verify(0);
3660
3661         return 0;
3662 }
3663
3664 static int
3665 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3666 {
3667         struct net *net = sock_net(skb->sk);
3668         struct ifaddrmsg *ifm;
3669         struct nlattr *tb[IFA_MAX+1];
3670         struct in6_addr *pfx, *peer_pfx;
3671         struct inet6_ifaddr *ifa;
3672         struct net_device *dev;
3673         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3674         u8 ifa_flags;
3675         int err;
3676
3677         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3678         if (err < 0)
3679                 return err;
3680
3681         ifm = nlmsg_data(nlh);
3682         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3683         if (pfx == NULL)
3684                 return -EINVAL;
3685
3686         if (tb[IFA_CACHEINFO]) {
3687                 struct ifa_cacheinfo *ci;
3688
3689                 ci = nla_data(tb[IFA_CACHEINFO]);
3690                 valid_lft = ci->ifa_valid;
3691                 preferred_lft = ci->ifa_prefered;
3692         } else {
3693                 preferred_lft = INFINITY_LIFE_TIME;
3694                 valid_lft = INFINITY_LIFE_TIME;
3695         }
3696
3697         dev =  __dev_get_by_index(net, ifm->ifa_index);
3698         if (dev == NULL)
3699                 return -ENODEV;
3700
3701         /* We ignore other flags so far. */
3702         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3703
3704         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3705         if (ifa == NULL) {
3706                 /*
3707                  * It would be best to check for !NLM_F_CREATE here but
3708                  * userspace alreay relies on not having to provide this.
3709                  */
3710                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3711                                       ifm->ifa_prefixlen, ifa_flags,
3712                                       preferred_lft, valid_lft);
3713         }
3714
3715         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3716             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3717                 err = -EEXIST;
3718         else
3719                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3720
3721         in6_ifa_put(ifa);
3722
3723         return err;
3724 }
3725
3726 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3727                           u8 scope, int ifindex)
3728 {
3729         struct ifaddrmsg *ifm;
3730
3731         ifm = nlmsg_data(nlh);
3732         ifm->ifa_family = AF_INET6;
3733         ifm->ifa_prefixlen = prefixlen;
3734         ifm->ifa_flags = flags;
3735         ifm->ifa_scope = scope;
3736         ifm->ifa_index = ifindex;
3737 }
3738
3739 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3740                          unsigned long tstamp, u32 preferred, u32 valid)
3741 {
3742         struct ifa_cacheinfo ci;
3743
3744         ci.cstamp = cstamp_delta(cstamp);
3745         ci.tstamp = cstamp_delta(tstamp);
3746         ci.ifa_prefered = preferred;
3747         ci.ifa_valid = valid;
3748
3749         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3750 }
3751
3752 static inline int rt_scope(int ifa_scope)
3753 {
3754         if (ifa_scope & IFA_HOST)
3755                 return RT_SCOPE_HOST;
3756         else if (ifa_scope & IFA_LINK)
3757                 return RT_SCOPE_LINK;
3758         else if (ifa_scope & IFA_SITE)
3759                 return RT_SCOPE_SITE;
3760         else
3761                 return RT_SCOPE_UNIVERSE;
3762 }
3763
3764 static inline int inet6_ifaddr_msgsize(void)
3765 {
3766         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3767                + nla_total_size(16) /* IFA_LOCAL */
3768                + nla_total_size(16) /* IFA_ADDRESS */
3769                + nla_total_size(sizeof(struct ifa_cacheinfo));
3770 }
3771
3772 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3773                              u32 portid, u32 seq, int event, unsigned int flags)
3774 {
3775         struct nlmsghdr  *nlh;
3776         u32 preferred, valid;
3777
3778         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3779         if (nlh == NULL)
3780                 return -EMSGSIZE;
3781
3782         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3783                       ifa->idev->dev->ifindex);
3784
3785         if (!((ifa->flags&IFA_F_PERMANENT) &&
3786               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3787                 preferred = ifa->prefered_lft;
3788                 valid = ifa->valid_lft;
3789                 if (preferred != INFINITY_LIFE_TIME) {
3790                         long tval = (jiffies - ifa->tstamp)/HZ;
3791                         if (preferred > tval)
3792                                 preferred -= tval;
3793                         else
3794                                 preferred = 0;
3795                         if (valid != INFINITY_LIFE_TIME) {
3796                                 if (valid > tval)
3797                                         valid -= tval;
3798                                 else
3799                                         valid = 0;
3800                         }
3801                 }
3802         } else {
3803                 preferred = INFINITY_LIFE_TIME;
3804                 valid = INFINITY_LIFE_TIME;
3805         }
3806
3807         if (!ipv6_addr_any(&ifa->peer_addr)) {
3808                 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3809                     nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3810                         goto error;
3811         } else
3812                 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3813                         goto error;
3814
3815         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3816                 goto error;
3817
3818         return nlmsg_end(skb, nlh);
3819
3820 error:
3821         nlmsg_cancel(skb, nlh);
3822         return -EMSGSIZE;
3823 }
3824
3825 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3826                                 u32 portid, u32 seq, int event, u16 flags)
3827 {
3828         struct nlmsghdr  *nlh;
3829         u8 scope = RT_SCOPE_UNIVERSE;
3830         int ifindex = ifmca->idev->dev->ifindex;
3831
3832         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3833                 scope = RT_SCOPE_SITE;
3834
3835         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3836         if (nlh == NULL)
3837                 return -EMSGSIZE;
3838
3839         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3840         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3841             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3842                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3843                 nlmsg_cancel(skb, nlh);
3844                 return -EMSGSIZE;
3845         }
3846
3847         return nlmsg_end(skb, nlh);
3848 }
3849
3850 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3851                                 u32 portid, u32 seq, int event, unsigned int flags)
3852 {
3853         struct nlmsghdr  *nlh;
3854         u8 scope = RT_SCOPE_UNIVERSE;
3855         int ifindex = ifaca->aca_idev->dev->ifindex;
3856
3857         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3858                 scope = RT_SCOPE_SITE;
3859
3860         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3861         if (nlh == NULL)
3862                 return -EMSGSIZE;
3863
3864         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3865         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3866             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3867                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3868                 nlmsg_cancel(skb, nlh);
3869                 return -EMSGSIZE;
3870         }
3871
3872         return nlmsg_end(skb, nlh);
3873 }
3874
3875 enum addr_type_t {
3876         UNICAST_ADDR,
3877         MULTICAST_ADDR,
3878         ANYCAST_ADDR,
3879 };
3880
3881 /* called with rcu_read_lock() */
3882 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3883                           struct netlink_callback *cb, enum addr_type_t type,
3884                           int s_ip_idx, int *p_ip_idx)
3885 {
3886         struct ifmcaddr6 *ifmca;
3887         struct ifacaddr6 *ifaca;
3888         int err = 1;
3889         int ip_idx = *p_ip_idx;
3890
3891         read_lock_bh(&idev->lock);
3892         switch (type) {
3893         case UNICAST_ADDR: {
3894                 struct inet6_ifaddr *ifa;
3895
3896                 /* unicast address incl. temp addr */
3897                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3898                         if (++ip_idx < s_ip_idx)
3899                                 continue;
3900                         err = inet6_fill_ifaddr(skb, ifa,
3901                                                 NETLINK_CB(cb->skb).portid,
3902                                                 cb->nlh->nlmsg_seq,
3903                                                 RTM_NEWADDR,
3904                                                 NLM_F_MULTI);
3905                         if (err <= 0)
3906                                 break;
3907                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3908                 }
3909                 break;
3910         }
3911         case MULTICAST_ADDR:
3912                 /* multicast address */
3913                 for (ifmca = idev->mc_list; ifmca;
3914                      ifmca = ifmca->next, ip_idx++) {
3915                         if (ip_idx < s_ip_idx)
3916                                 continue;
3917                         err = inet6_fill_ifmcaddr(skb, ifmca,
3918                                                   NETLINK_CB(cb->skb).portid,
3919                                                   cb->nlh->nlmsg_seq,
3920                                                   RTM_GETMULTICAST,
3921                                                   NLM_F_MULTI);
3922                         if (err <= 0)
3923                                 break;
3924                 }
3925                 break;
3926         case ANYCAST_ADDR:
3927                 /* anycast address */
3928                 for (ifaca = idev->ac_list; ifaca;
3929                      ifaca = ifaca->aca_next, ip_idx++) {
3930                         if (ip_idx < s_ip_idx)
3931                                 continue;
3932                         err = inet6_fill_ifacaddr(skb, ifaca,
3933                                                   NETLINK_CB(cb->skb).portid,
3934                                                   cb->nlh->nlmsg_seq,
3935                                                   RTM_GETANYCAST,
3936                                                   NLM_F_MULTI);
3937                         if (err <= 0)
3938                                 break;
3939                 }
3940                 break;
3941         default:
3942                 break;
3943         }
3944         read_unlock_bh(&idev->lock);
3945         *p_ip_idx = ip_idx;
3946         return err;
3947 }
3948
3949 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3950                            enum addr_type_t type)
3951 {
3952         struct net *net = sock_net(skb->sk);
3953         int h, s_h;
3954         int idx, ip_idx;
3955         int s_idx, s_ip_idx;
3956         struct net_device *dev;
3957         struct inet6_dev *idev;
3958         struct hlist_head *head;
3959
3960         s_h = cb->args[0];
3961         s_idx = idx = cb->args[1];
3962         s_ip_idx = ip_idx = cb->args[2];
3963
3964         rcu_read_lock();
3965         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3966         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3967                 idx = 0;
3968                 head = &net->dev_index_head[h];
3969                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3970                         if (idx < s_idx)
3971                                 goto cont;
3972                         if (h > s_h || idx > s_idx)
3973                                 s_ip_idx = 0;
3974                         ip_idx = 0;
3975                         idev = __in6_dev_get(dev);
3976                         if (!idev)
3977                                 goto cont;
3978
3979                         if (in6_dump_addrs(idev, skb, cb, type,
3980                                            s_ip_idx, &ip_idx) <= 0)
3981                                 goto done;
3982 cont:
3983                         idx++;
3984                 }
3985         }
3986 done:
3987         rcu_read_unlock();
3988         cb->args[0] = h;
3989         cb->args[1] = idx;
3990         cb->args[2] = ip_idx;
3991
3992         return skb->len;
3993 }
3994
3995 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3996 {
3997         enum addr_type_t type = UNICAST_ADDR;
3998
3999         return inet6_dump_addr(skb, cb, type);
4000 }
4001
4002 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4003 {
4004         enum addr_type_t type = MULTICAST_ADDR;
4005
4006         return inet6_dump_addr(skb, cb, type);
4007 }
4008
4009
4010 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4011 {
4012         enum addr_type_t type = ANYCAST_ADDR;
4013
4014         return inet6_dump_addr(skb, cb, type);
4015 }
4016
4017 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4018 {
4019         struct net *net = sock_net(in_skb->sk);
4020         struct ifaddrmsg *ifm;
4021         struct nlattr *tb[IFA_MAX+1];
4022         struct in6_addr *addr = NULL, *peer;
4023         struct net_device *dev = NULL;
4024         struct inet6_ifaddr *ifa;
4025         struct sk_buff *skb;
4026         int err;
4027
4028         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4029         if (err < 0)
4030                 goto errout;
4031
4032         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4033         if (addr == NULL) {
4034                 err = -EINVAL;
4035                 goto errout;
4036         }
4037
4038         ifm = nlmsg_data(nlh);
4039         if (ifm->ifa_index)
4040                 dev = __dev_get_by_index(net, ifm->ifa_index);
4041
4042         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4043         if (!ifa) {
4044                 err = -EADDRNOTAVAIL;
4045                 goto errout;
4046         }
4047
4048         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4049         if (!skb) {
4050                 err = -ENOBUFS;
4051                 goto errout_ifa;
4052         }
4053
4054         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4055                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4056         if (err < 0) {
4057                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4058                 WARN_ON(err == -EMSGSIZE);
4059                 kfree_skb(skb);
4060                 goto errout_ifa;
4061         }
4062         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4063 errout_ifa:
4064         in6_ifa_put(ifa);
4065 errout:
4066         return err;
4067 }
4068
4069 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4070 {
4071         struct sk_buff *skb;
4072         struct net *net = dev_net(ifa->idev->dev);
4073         int err = -ENOBUFS;
4074
4075         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4076         if (skb == NULL)
4077                 goto errout;
4078
4079         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4080         if (err < 0) {
4081                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4082                 WARN_ON(err == -EMSGSIZE);
4083                 kfree_skb(skb);
4084                 goto errout;
4085         }
4086         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4087         return;
4088 errout:
4089         if (err < 0)
4090                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4091 }
4092
4093 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4094                                 __s32 *array, int bytes)
4095 {
4096         BUG_ON(bytes < (DEVCONF_MAX * 4));
4097
4098         memset(array, 0, bytes);
4099         array[DEVCONF_FORWARDING] = cnf->forwarding;
4100         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4101         array[DEVCONF_MTU6] = cnf->mtu6;
4102         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4103         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4104         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4105         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4106         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4107         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4108                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4109         array[DEVCONF_RTR_SOLICIT_DELAY] =
4110                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4111         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4112         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4113                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4114         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4115                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4116         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4117         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4118         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4119         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4120         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4121         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4122         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4123         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4124 #ifdef CONFIG_IPV6_ROUTER_PREF
4125         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4126         array[DEVCONF_RTR_PROBE_INTERVAL] =
4127                 jiffies_to_msecs(cnf->rtr_probe_interval);
4128 #ifdef CONFIG_IPV6_ROUTE_INFO
4129         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4130 #endif
4131 #endif
4132         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4133         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4134 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4135         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4136 #endif
4137 #ifdef CONFIG_IPV6_MROUTE
4138         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4139 #endif
4140         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4141         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4142         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4143         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4144         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4145 }
4146
4147 static inline size_t inet6_ifla6_size(void)
4148 {
4149         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4150              + nla_total_size(sizeof(struct ifla_cacheinfo))
4151              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4152              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4153              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4154              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4155 }
4156
4157 static inline size_t inet6_if_nlmsg_size(void)
4158 {
4159         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4160                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4161                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4162                + nla_total_size(4) /* IFLA_MTU */
4163                + nla_total_size(4) /* IFLA_LINK */
4164                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4165 }
4166
4167 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4168                                       int items, int bytes)
4169 {
4170         int i;
4171         int pad = bytes - sizeof(u64) * items;
4172         BUG_ON(pad < 0);
4173
4174         /* Use put_unaligned() because stats may not be aligned for u64. */
4175         put_unaligned(items, &stats[0]);
4176         for (i = 1; i < items; i++)
4177                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4178
4179         memset(&stats[items], 0, pad);
4180 }
4181
4182 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4183                                       int items, int bytes, size_t syncpoff)
4184 {
4185         int i;
4186         int pad = bytes - sizeof(u64) * items;
4187         BUG_ON(pad < 0);
4188
4189         /* Use put_unaligned() because stats may not be aligned for u64. */
4190         put_unaligned(items, &stats[0]);
4191         for (i = 1; i < items; i++)
4192                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4193
4194         memset(&stats[items], 0, pad);
4195 }
4196
4197 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4198                              int bytes)
4199 {
4200         switch (attrtype) {
4201         case IFLA_INET6_STATS:
4202                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4203                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4204                 break;
4205         case IFLA_INET6_ICMP6STATS:
4206                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4207                 break;
4208         }
4209 }
4210
4211 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4212 {
4213         struct nlattr *nla;
4214         struct ifla_cacheinfo ci;
4215
4216         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4217                 goto nla_put_failure;
4218         ci.max_reasm_len = IPV6_MAXPLEN;
4219         ci.tstamp = cstamp_delta(idev->tstamp);
4220         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4221         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4222         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4223                 goto nla_put_failure;
4224         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4225         if (nla == NULL)
4226                 goto nla_put_failure;
4227         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4228
4229         /* XXX - MC not implemented */
4230
4231         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4232         if (nla == NULL)
4233                 goto nla_put_failure;
4234         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4235
4236         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4237         if (nla == NULL)
4238                 goto nla_put_failure;
4239         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4240
4241         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4242         if (nla == NULL)
4243                 goto nla_put_failure;
4244         read_lock_bh(&idev->lock);
4245         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4246         read_unlock_bh(&idev->lock);
4247
4248         return 0;
4249
4250 nla_put_failure:
4251         return -EMSGSIZE;
4252 }
4253
4254 static size_t inet6_get_link_af_size(const struct net_device *dev)
4255 {
4256         if (!__in6_dev_get(dev))
4257                 return 0;
4258
4259         return inet6_ifla6_size();
4260 }
4261
4262 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4263 {
4264         struct inet6_dev *idev = __in6_dev_get(dev);
4265
4266         if (!idev)
4267                 return -ENODATA;
4268
4269         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4270                 return -EMSGSIZE;
4271
4272         return 0;
4273 }
4274
4275 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4276 {
4277         struct inet6_ifaddr *ifp;
4278         struct net_device *dev = idev->dev;
4279         bool update_rs = false;
4280         struct in6_addr ll_addr;
4281
4282         if (token == NULL)
4283                 return -EINVAL;
4284         if (ipv6_addr_any(token))
4285                 return -EINVAL;
4286         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4287                 return -EINVAL;
4288         if (!ipv6_accept_ra(idev))
4289                 return -EINVAL;
4290         if (idev->cnf.rtr_solicits <= 0)
4291                 return -EINVAL;
4292
4293         write_lock_bh(&idev->lock);
4294
4295         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4296         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4297
4298         write_unlock_bh(&idev->lock);
4299
4300         if (!idev->dead && (idev->if_flags & IF_READY) &&
4301             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4302                              IFA_F_OPTIMISTIC)) {
4303
4304                 /* If we're not ready, then normal ifup will take care
4305                  * of this. Otherwise, we need to request our rs here.
4306                  */
4307                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4308                 update_rs = true;
4309         }
4310
4311         write_lock_bh(&idev->lock);
4312
4313         if (update_rs) {
4314                 idev->if_flags |= IF_RS_SENT;
4315                 idev->rs_probes = 1;
4316                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4317         }
4318
4319         /* Well, that's kinda nasty ... */
4320         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4321                 spin_lock(&ifp->lock);
4322                 if (ifp->tokenized) {
4323                         ifp->valid_lft = 0;
4324                         ifp->prefered_lft = 0;
4325                 }
4326                 spin_unlock(&ifp->lock);
4327         }
4328
4329         write_unlock_bh(&idev->lock);
4330         addrconf_verify(0);
4331         return 0;
4332 }
4333
4334 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4335 {
4336         int err = -EINVAL;
4337         struct inet6_dev *idev = __in6_dev_get(dev);
4338         struct nlattr *tb[IFLA_INET6_MAX + 1];
4339
4340         if (!idev)
4341                 return -EAFNOSUPPORT;
4342
4343         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4344                 BUG();
4345
4346         if (tb[IFLA_INET6_TOKEN])
4347                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4348
4349         return err;
4350 }
4351
4352 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4353                              u32 portid, u32 seq, int event, unsigned int flags)
4354 {
4355         struct net_device *dev = idev->dev;
4356         struct ifinfomsg *hdr;
4357         struct nlmsghdr *nlh;
4358         void *protoinfo;
4359
4360         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4361         if (nlh == NULL)
4362                 return -EMSGSIZE;
4363
4364         hdr = nlmsg_data(nlh);
4365         hdr->ifi_family = AF_INET6;
4366         hdr->__ifi_pad = 0;
4367         hdr->ifi_type = dev->type;
4368         hdr->ifi_index = dev->ifindex;
4369         hdr->ifi_flags = dev_get_flags(dev);
4370         hdr->ifi_change = 0;
4371
4372         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4373             (dev->addr_len &&
4374              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4375             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4376             (dev->ifindex != dev->iflink &&
4377              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4378                 goto nla_put_failure;
4379         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4380         if (protoinfo == NULL)
4381                 goto nla_put_failure;
4382
4383         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4384                 goto nla_put_failure;
4385
4386         nla_nest_end(skb, protoinfo);
4387         return nlmsg_end(skb, nlh);
4388
4389 nla_put_failure:
4390         nlmsg_cancel(skb, nlh);
4391         return -EMSGSIZE;
4392 }
4393
4394 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4395 {
4396         struct net *net = sock_net(skb->sk);
4397         int h, s_h;
4398         int idx = 0, s_idx;
4399         struct net_device *dev;
4400         struct inet6_dev *idev;
4401         struct hlist_head *head;
4402
4403         s_h = cb->args[0];
4404         s_idx = cb->args[1];
4405
4406         rcu_read_lock();
4407         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4408                 idx = 0;
4409                 head = &net->dev_index_head[h];
4410                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4411                         if (idx < s_idx)
4412                                 goto cont;
4413                         idev = __in6_dev_get(dev);
4414                         if (!idev)
4415                                 goto cont;
4416                         if (inet6_fill_ifinfo(skb, idev,
4417                                               NETLINK_CB(cb->skb).portid,
4418                                               cb->nlh->nlmsg_seq,
4419                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4420                                 goto out;
4421 cont:
4422                         idx++;
4423                 }
4424         }
4425 out:
4426         rcu_read_unlock();
4427         cb->args[1] = idx;
4428         cb->args[0] = h;
4429
4430         return skb->len;
4431 }
4432
4433 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4434 {
4435         struct sk_buff *skb;
4436         struct net *net = dev_net(idev->dev);
4437         int err = -ENOBUFS;
4438
4439         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4440         if (skb == NULL)
4441                 goto errout;
4442
4443         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4444         if (err < 0) {
4445                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4446                 WARN_ON(err == -EMSGSIZE);
4447                 kfree_skb(skb);
4448                 goto errout;
4449         }
4450         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4451         return;
4452 errout:
4453         if (err < 0)
4454                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4455 }
4456
4457 static inline size_t inet6_prefix_nlmsg_size(void)
4458 {
4459         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4460                + nla_total_size(sizeof(struct in6_addr))
4461                + nla_total_size(sizeof(struct prefix_cacheinfo));
4462 }
4463
4464 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4465                              struct prefix_info *pinfo, u32 portid, u32 seq,
4466                              int event, unsigned int flags)
4467 {
4468         struct prefixmsg *pmsg;
4469         struct nlmsghdr *nlh;
4470         struct prefix_cacheinfo ci;
4471
4472         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4473         if (nlh == NULL)
4474                 return -EMSGSIZE;
4475
4476         pmsg = nlmsg_data(nlh);
4477         pmsg->prefix_family = AF_INET6;
4478         pmsg->prefix_pad1 = 0;
4479         pmsg->prefix_pad2 = 0;
4480         pmsg->prefix_ifindex = idev->dev->ifindex;
4481         pmsg->prefix_len = pinfo->prefix_len;
4482         pmsg->prefix_type = pinfo->type;
4483         pmsg->prefix_pad3 = 0;
4484         pmsg->prefix_flags = 0;
4485         if (pinfo->onlink)
4486                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4487         if (pinfo->autoconf)
4488                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4489
4490         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4491                 goto nla_put_failure;
4492         ci.preferred_time = ntohl(pinfo->prefered);
4493         ci.valid_time = ntohl(pinfo->valid);
4494         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4495                 goto nla_put_failure;
4496         return nlmsg_end(skb, nlh);
4497
4498 nla_put_failure:
4499         nlmsg_cancel(skb, nlh);
4500         return -EMSGSIZE;
4501 }
4502
4503 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4504                          struct prefix_info *pinfo)
4505 {
4506         struct sk_buff *skb;
4507         struct net *net = dev_net(idev->dev);
4508         int err = -ENOBUFS;
4509
4510         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4511         if (skb == NULL)
4512                 goto errout;
4513
4514         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4515         if (err < 0) {
4516                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4517                 WARN_ON(err == -EMSGSIZE);
4518                 kfree_skb(skb);
4519                 goto errout;
4520         }
4521         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4522         return;
4523 errout:
4524         if (err < 0)
4525                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4526 }
4527
4528 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4529 {
4530         struct net *net = dev_net(ifp->idev->dev);
4531
4532         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4533
4534         switch (event) {
4535         case RTM_NEWADDR:
4536                 /*
4537                  * If the address was optimistic
4538                  * we inserted the route at the start of
4539                  * our DAD process, so we don't need
4540                  * to do it again
4541                  */
4542                 if (!(ifp->rt->rt6i_node))
4543                         ip6_ins_rt(ifp->rt);
4544                 if (ifp->idev->cnf.forwarding)
4545                         addrconf_join_anycast(ifp);
4546                 if (!ipv6_addr_any(&ifp->peer_addr))
4547                         addrconf_prefix_route(&ifp->peer_addr, 128,
4548                                               ifp->idev->dev, 0, 0);
4549                 break;
4550         case RTM_DELADDR:
4551                 if (ifp->idev->cnf.forwarding)
4552                         addrconf_leave_anycast(ifp);
4553                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4554                 if (!ipv6_addr_any(&ifp->peer_addr)) {
4555                         struct rt6_info *rt;
4556                         struct net_device *dev = ifp->idev->dev;
4557
4558                         rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4559                                         dev->ifindex, 1);
4560                         if (rt) {
4561                                 dst_hold(&rt->dst);
4562                                 if (ip6_del_rt(rt))
4563                                         dst_free(&rt->dst);
4564                         }
4565                 }
4566                 dst_hold(&ifp->rt->dst);
4567
4568                 if (ip6_del_rt(ifp->rt))
4569                         dst_free(&ifp->rt->dst);
4570                 break;
4571         }
4572         atomic_inc(&net->ipv6.dev_addr_genid);
4573         rt_genid_bump_ipv6(net);
4574 }
4575
4576 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4577 {
4578         rcu_read_lock_bh();
4579         if (likely(ifp->idev->dead == 0))
4580                 __ipv6_ifa_notify(event, ifp);
4581         rcu_read_unlock_bh();
4582 }
4583
4584 #ifdef CONFIG_SYSCTL
4585
4586 static
4587 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4588                            void __user *buffer, size_t *lenp, loff_t *ppos)
4589 {
4590         int *valp = ctl->data;
4591         int val = *valp;
4592         loff_t pos = *ppos;
4593         struct ctl_table lctl;
4594         int ret;
4595
4596         /*
4597          * ctl->data points to idev->cnf.forwarding, we should
4598          * not modify it until we get the rtnl lock.
4599          */
4600         lctl = *ctl;
4601         lctl.data = &val;
4602
4603         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4604
4605         if (write)
4606                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4607         if (ret)
4608                 *ppos = pos;
4609         return ret;
4610 }
4611
4612 static void dev_disable_change(struct inet6_dev *idev)
4613 {
4614         struct netdev_notifier_info info;
4615
4616         if (!idev || !idev->dev)
4617                 return;
4618
4619         netdev_notifier_info_init(&info, idev->dev);
4620         if (idev->cnf.disable_ipv6)
4621                 addrconf_notify(NULL, NETDEV_DOWN, &info);
4622         else
4623                 addrconf_notify(NULL, NETDEV_UP, &info);
4624 }
4625
4626 static void addrconf_disable_change(struct net *net, __s32 newf)
4627 {
4628         struct net_device *dev;
4629         struct inet6_dev *idev;
4630
4631         rcu_read_lock();
4632         for_each_netdev_rcu(net, dev) {
4633                 idev = __in6_dev_get(dev);
4634                 if (idev) {
4635                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4636                         idev->cnf.disable_ipv6 = newf;
4637                         if (changed)
4638                                 dev_disable_change(idev);
4639                 }
4640         }
4641         rcu_read_unlock();
4642 }
4643
4644 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4645 {
4646         struct net *net;
4647         int old;
4648
4649         if (!rtnl_trylock())
4650                 return restart_syscall();
4651
4652         net = (struct net *)table->extra2;
4653         old = *p;
4654         *p = newf;
4655
4656         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4657                 rtnl_unlock();
4658                 return 0;
4659         }
4660
4661         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4662                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4663                 addrconf_disable_change(net, newf);
4664         } else if ((!newf) ^ (!old))
4665                 dev_disable_change((struct inet6_dev *)table->extra1);
4666
4667         rtnl_unlock();
4668         return 0;
4669 }
4670
4671 static
4672 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4673                             void __user *buffer, size_t *lenp, loff_t *ppos)
4674 {
4675         int *valp = ctl->data;
4676         int val = *valp;
4677         loff_t pos = *ppos;
4678         struct ctl_table lctl;
4679         int ret;
4680
4681         /*
4682          * ctl->data points to idev->cnf.disable_ipv6, we should
4683          * not modify it until we get the rtnl lock.
4684          */
4685         lctl = *ctl;
4686         lctl.data = &val;
4687
4688         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4689
4690         if (write)
4691                 ret = addrconf_disable_ipv6(ctl, valp, val);
4692         if (ret)
4693                 *ppos = pos;
4694         return ret;
4695 }
4696
4697 static struct addrconf_sysctl_table
4698 {
4699         struct ctl_table_header *sysctl_header;
4700         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4701 } addrconf_sysctl __read_mostly = {
4702         .sysctl_header = NULL,
4703         .addrconf_vars = {
4704                 {
4705                         .procname       = "forwarding",
4706                         .data           = &ipv6_devconf.forwarding,
4707                         .maxlen         = sizeof(int),
4708                         .mode           = 0644,
4709                         .proc_handler   = addrconf_sysctl_forward,
4710                 },
4711                 {
4712                         .procname       = "hop_limit",
4713                         .data           = &ipv6_devconf.hop_limit,
4714                         .maxlen         = sizeof(int),
4715                         .mode           = 0644,
4716                         .proc_handler   = proc_dointvec,
4717                 },
4718                 {
4719                         .procname       = "mtu",
4720                         .data           = &ipv6_devconf.mtu6,
4721                         .maxlen         = sizeof(int),
4722                         .mode           = 0644,
4723                         .proc_handler   = proc_dointvec,
4724                 },
4725                 {
4726                         .procname       = "accept_ra",
4727                         .data           = &ipv6_devconf.accept_ra,
4728                         .maxlen         = sizeof(int),
4729                         .mode           = 0644,
4730                         .proc_handler   = proc_dointvec,
4731                 },
4732                 {
4733                         .procname       = "accept_redirects",
4734                         .data           = &ipv6_devconf.accept_redirects,
4735                         .maxlen         = sizeof(int),
4736                         .mode           = 0644,
4737                         .proc_handler   = proc_dointvec,
4738                 },
4739                 {
4740                         .procname       = "autoconf",
4741                         .data           = &ipv6_devconf.autoconf,
4742                         .maxlen         = sizeof(int),
4743                         .mode           = 0644,
4744                         .proc_handler   = proc_dointvec,
4745                 },
4746                 {
4747                         .procname       = "dad_transmits",
4748                         .data           = &ipv6_devconf.dad_transmits,
4749                         .maxlen         = sizeof(int),
4750                         .mode           = 0644,
4751                         .proc_handler   = proc_dointvec,
4752                 },
4753                 {
4754                         .procname       = "router_solicitations",
4755                         .data           = &ipv6_devconf.rtr_solicits,
4756                         .maxlen         = sizeof(int),
4757                         .mode           = 0644,
4758                         .proc_handler   = proc_dointvec,
4759                 },
4760                 {
4761                         .procname       = "router_solicitation_interval",
4762                         .data           = &ipv6_devconf.rtr_solicit_interval,
4763                         .maxlen         = sizeof(int),
4764                         .mode           = 0644,
4765                         .proc_handler   = proc_dointvec_jiffies,
4766                 },
4767                 {
4768                         .procname       = "router_solicitation_delay",
4769                         .data           = &ipv6_devconf.rtr_solicit_delay,
4770                         .maxlen         = sizeof(int),
4771                         .mode           = 0644,
4772                         .proc_handler   = proc_dointvec_jiffies,
4773                 },
4774                 {
4775                         .procname       = "force_mld_version",
4776                         .data           = &ipv6_devconf.force_mld_version,
4777                         .maxlen         = sizeof(int),
4778                         .mode           = 0644,
4779                         .proc_handler   = proc_dointvec,
4780                 },
4781                 {
4782                         .procname       = "mldv1_unsolicited_report_interval",
4783                         .data           =
4784                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
4785                         .maxlen         = sizeof(int),
4786                         .mode           = 0644,
4787                         .proc_handler   = proc_dointvec_ms_jiffies,
4788                 },
4789                 {
4790                         .procname       = "mldv2_unsolicited_report_interval",
4791                         .data           =
4792                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
4793                         .maxlen         = sizeof(int),
4794                         .mode           = 0644,
4795                         .proc_handler   = proc_dointvec_ms_jiffies,
4796                 },
4797                 {
4798                         .procname       = "use_tempaddr",
4799                         .data           = &ipv6_devconf.use_tempaddr,
4800                         .maxlen         = sizeof(int),
4801                         .mode           = 0644,
4802                         .proc_handler   = proc_dointvec,
4803                 },
4804                 {
4805                         .procname       = "temp_valid_lft",
4806                         .data           = &ipv6_devconf.temp_valid_lft,
4807                         .maxlen         = sizeof(int),
4808                         .mode           = 0644,
4809                         .proc_handler   = proc_dointvec,
4810                 },
4811                 {
4812                         .procname       = "temp_prefered_lft",
4813                         .data           = &ipv6_devconf.temp_prefered_lft,
4814                         .maxlen         = sizeof(int),
4815                         .mode           = 0644,
4816                         .proc_handler   = proc_dointvec,
4817                 },
4818                 {
4819                         .procname       = "regen_max_retry",
4820                         .data           = &ipv6_devconf.regen_max_retry,
4821                         .maxlen         = sizeof(int),
4822                         .mode           = 0644,
4823                         .proc_handler   = proc_dointvec,
4824                 },
4825                 {
4826                         .procname       = "max_desync_factor",
4827                         .data           = &ipv6_devconf.max_desync_factor,
4828                         .maxlen         = sizeof(int),
4829                         .mode           = 0644,
4830                         .proc_handler   = proc_dointvec,
4831                 },
4832                 {
4833                         .procname       = "max_addresses",
4834                         .data           = &ipv6_devconf.max_addresses,
4835                         .maxlen         = sizeof(int),
4836                         .mode           = 0644,
4837                         .proc_handler   = proc_dointvec,
4838                 },
4839                 {
4840                         .procname       = "accept_ra_defrtr",
4841                         .data           = &ipv6_devconf.accept_ra_defrtr,
4842                         .maxlen         = sizeof(int),
4843                         .mode           = 0644,
4844                         .proc_handler   = proc_dointvec,
4845                 },
4846                 {
4847                         .procname       = "accept_ra_pinfo",
4848                         .data           = &ipv6_devconf.accept_ra_pinfo,
4849                         .maxlen         = sizeof(int),
4850                         .mode           = 0644,
4851                         .proc_handler   = proc_dointvec,
4852                 },
4853 #ifdef CONFIG_IPV6_ROUTER_PREF
4854                 {
4855                         .procname       = "accept_ra_rtr_pref",
4856                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4857                         .maxlen         = sizeof(int),
4858                         .mode           = 0644,
4859                         .proc_handler   = proc_dointvec,
4860                 },
4861                 {
4862                         .procname       = "router_probe_interval",
4863                         .data           = &ipv6_devconf.rtr_probe_interval,
4864                         .maxlen         = sizeof(int),
4865                         .mode           = 0644,
4866                         .proc_handler   = proc_dointvec_jiffies,
4867                 },
4868 #ifdef CONFIG_IPV6_ROUTE_INFO
4869                 {
4870                         .procname       = "accept_ra_rt_info_max_plen",
4871                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4872                         .maxlen         = sizeof(int),
4873                         .mode           = 0644,
4874                         .proc_handler   = proc_dointvec,
4875                 },
4876 #endif
4877 #endif
4878                 {
4879                         .procname       = "proxy_ndp",
4880                         .data           = &ipv6_devconf.proxy_ndp,
4881                         .maxlen         = sizeof(int),
4882                         .mode           = 0644,
4883                         .proc_handler   = proc_dointvec,
4884                 },
4885                 {
4886                         .procname       = "accept_source_route",
4887                         .data           = &ipv6_devconf.accept_source_route,
4888                         .maxlen         = sizeof(int),
4889                         .mode           = 0644,
4890                         .proc_handler   = proc_dointvec,
4891                 },
4892 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4893                 {
4894                         .procname       = "optimistic_dad",
4895                         .data           = &ipv6_devconf.optimistic_dad,
4896                         .maxlen         = sizeof(int),
4897                         .mode           = 0644,
4898                         .proc_handler   = proc_dointvec,
4899
4900                 },
4901 #endif
4902 #ifdef CONFIG_IPV6_MROUTE
4903                 {
4904                         .procname       = "mc_forwarding",
4905                         .data           = &ipv6_devconf.mc_forwarding,
4906                         .maxlen         = sizeof(int),
4907                         .mode           = 0444,
4908                         .proc_handler   = proc_dointvec,
4909                 },
4910 #endif
4911                 {
4912                         .procname       = "disable_ipv6",
4913                         .data           = &ipv6_devconf.disable_ipv6,
4914                         .maxlen         = sizeof(int),
4915                         .mode           = 0644,
4916                         .proc_handler   = addrconf_sysctl_disable,
4917                 },
4918                 {
4919                         .procname       = "accept_dad",
4920                         .data           = &ipv6_devconf.accept_dad,
4921                         .maxlen         = sizeof(int),
4922                         .mode           = 0644,
4923                         .proc_handler   = proc_dointvec,
4924                 },
4925                 {
4926                         .procname       = "force_tllao",
4927                         .data           = &ipv6_devconf.force_tllao,
4928                         .maxlen         = sizeof(int),
4929                         .mode           = 0644,
4930                         .proc_handler   = proc_dointvec
4931                 },
4932                 {
4933                         .procname       = "ndisc_notify",
4934                         .data           = &ipv6_devconf.ndisc_notify,
4935                         .maxlen         = sizeof(int),
4936                         .mode           = 0644,
4937                         .proc_handler   = proc_dointvec
4938                 },
4939                 {
4940                         .procname       = "suppress_frag_ndisc",
4941                         .data           = &ipv6_devconf.suppress_frag_ndisc,
4942                         .maxlen         = sizeof(int),
4943                         .mode           = 0644,
4944                         .proc_handler   = proc_dointvec
4945                 },
4946                 {
4947                         /* sentinel */
4948                 }
4949         },
4950 };
4951
4952 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4953                 struct inet6_dev *idev, struct ipv6_devconf *p)
4954 {
4955         int i;
4956         struct addrconf_sysctl_table *t;
4957         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4958
4959         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4960         if (t == NULL)
4961                 goto out;
4962
4963         for (i = 0; t->addrconf_vars[i].data; i++) {
4964                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4965                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4966                 t->addrconf_vars[i].extra2 = net;
4967         }
4968
4969         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4970
4971         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4972         if (t->sysctl_header == NULL)
4973                 goto free;
4974
4975         p->sysctl = t;
4976         return 0;
4977
4978 free:
4979         kfree(t);
4980 out:
4981         return -ENOBUFS;
4982 }
4983
4984 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4985 {
4986         struct addrconf_sysctl_table *t;
4987
4988         if (p->sysctl == NULL)
4989                 return;
4990
4991         t = p->sysctl;
4992         p->sysctl = NULL;
4993         unregister_net_sysctl_table(t->sysctl_header);
4994         kfree(t);
4995 }
4996
4997 static void addrconf_sysctl_register(struct inet6_dev *idev)
4998 {
4999         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5000                               &ndisc_ifinfo_sysctl_change);
5001         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5002                                         idev, &idev->cnf);
5003 }
5004
5005 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5006 {
5007         __addrconf_sysctl_unregister(&idev->cnf);
5008         neigh_sysctl_unregister(idev->nd_parms);
5009 }
5010
5011
5012 #endif
5013
5014 static int __net_init addrconf_init_net(struct net *net)
5015 {
5016         int err = -ENOMEM;
5017         struct ipv6_devconf *all, *dflt;
5018
5019         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5020         if (all == NULL)
5021                 goto err_alloc_all;
5022
5023         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5024         if (dflt == NULL)
5025                 goto err_alloc_dflt;
5026
5027         /* these will be inherited by all namespaces */
5028         dflt->autoconf = ipv6_defaults.autoconf;
5029         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5030
5031         net->ipv6.devconf_all = all;
5032         net->ipv6.devconf_dflt = dflt;
5033
5034 #ifdef CONFIG_SYSCTL
5035         err = __addrconf_sysctl_register(net, "all", NULL, all);
5036         if (err < 0)
5037                 goto err_reg_all;
5038
5039         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5040         if (err < 0)
5041                 goto err_reg_dflt;
5042 #endif
5043         return 0;
5044
5045 #ifdef CONFIG_SYSCTL
5046 err_reg_dflt:
5047         __addrconf_sysctl_unregister(all);
5048 err_reg_all:
5049         kfree(dflt);
5050 #endif
5051 err_alloc_dflt:
5052         kfree(all);
5053 err_alloc_all:
5054         return err;
5055 }
5056
5057 static void __net_exit addrconf_exit_net(struct net *net)
5058 {
5059 #ifdef CONFIG_SYSCTL
5060         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5061         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5062 #endif
5063         if (!net_eq(net, &init_net)) {
5064                 kfree(net->ipv6.devconf_dflt);
5065                 kfree(net->ipv6.devconf_all);
5066         }
5067 }
5068
5069 static struct pernet_operations addrconf_ops = {
5070         .init = addrconf_init_net,
5071         .exit = addrconf_exit_net,
5072 };
5073
5074 static struct rtnl_af_ops inet6_ops = {
5075         .family           = AF_INET6,
5076         .fill_link_af     = inet6_fill_link_af,
5077         .get_link_af_size = inet6_get_link_af_size,
5078         .set_link_af      = inet6_set_link_af,
5079 };
5080
5081 /*
5082  *      Init / cleanup code
5083  */
5084
5085 int __init addrconf_init(void)
5086 {
5087         int i, err;
5088
5089         err = ipv6_addr_label_init();
5090         if (err < 0) {
5091                 pr_crit("%s: cannot initialize default policy table: %d\n",
5092                         __func__, err);
5093                 goto out;
5094         }
5095
5096         err = register_pernet_subsys(&addrconf_ops);
5097         if (err < 0)
5098                 goto out_addrlabel;
5099
5100         /* The addrconf netdev notifier requires that loopback_dev
5101          * has it's ipv6 private information allocated and setup
5102          * before it can bring up and give link-local addresses
5103          * to other devices which are up.
5104          *
5105          * Unfortunately, loopback_dev is not necessarily the first
5106          * entry in the global dev_base list of net devices.  In fact,
5107          * it is likely to be the very last entry on that list.
5108          * So this causes the notifier registry below to try and
5109          * give link-local addresses to all devices besides loopback_dev
5110          * first, then loopback_dev, which cases all the non-loopback_dev
5111          * devices to fail to get a link-local address.
5112          *
5113          * So, as a temporary fix, allocate the ipv6 structure for
5114          * loopback_dev first by hand.
5115          * Longer term, all of the dependencies ipv6 has upon the loopback
5116          * device and it being up should be removed.
5117          */
5118         rtnl_lock();
5119         if (!ipv6_add_dev(init_net.loopback_dev))
5120                 err = -ENOMEM;
5121         rtnl_unlock();
5122         if (err)
5123                 goto errlo;
5124
5125         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5126                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5127
5128         register_netdevice_notifier(&ipv6_dev_notf);
5129
5130         addrconf_verify(0);
5131
5132         err = rtnl_af_register(&inet6_ops);
5133         if (err < 0)
5134                 goto errout_af;
5135
5136         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5137                               NULL);
5138         if (err < 0)
5139                 goto errout;
5140
5141         /* Only the first call to __rtnl_register can fail */
5142         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5143         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5144         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5145                         inet6_dump_ifaddr, NULL);
5146         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5147                         inet6_dump_ifmcaddr, NULL);
5148         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5149                         inet6_dump_ifacaddr, NULL);
5150         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5151                         inet6_netconf_dump_devconf, NULL);
5152
5153         ipv6_addr_label_rtnl_register();
5154
5155         return 0;
5156 errout:
5157         rtnl_af_unregister(&inet6_ops);
5158 errout_af:
5159         unregister_netdevice_notifier(&ipv6_dev_notf);
5160 errlo:
5161         unregister_pernet_subsys(&addrconf_ops);
5162 out_addrlabel:
5163         ipv6_addr_label_cleanup();
5164 out:
5165         return err;
5166 }
5167
5168 void addrconf_cleanup(void)
5169 {
5170         struct net_device *dev;
5171         int i;
5172
5173         unregister_netdevice_notifier(&ipv6_dev_notf);
5174         unregister_pernet_subsys(&addrconf_ops);
5175         ipv6_addr_label_cleanup();
5176
5177         rtnl_lock();
5178
5179         __rtnl_af_unregister(&inet6_ops);
5180
5181         /* clean dev list */
5182         for_each_netdev(&init_net, dev) {
5183                 if (__in6_dev_get(dev) == NULL)
5184                         continue;
5185                 addrconf_ifdown(dev, 1);
5186         }
5187         addrconf_ifdown(init_net.loopback_dev, 2);
5188
5189         /*
5190          *      Check hash table.
5191          */
5192         spin_lock_bh(&addrconf_hash_lock);
5193         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5194                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5195         spin_unlock_bh(&addrconf_hash_lock);
5196
5197         del_timer(&addr_chk_timer);
5198         rtnl_unlock();
5199 }