Pileus Git - ~andy/linux/blob - 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(void);
 137 static void addrconf_verify_rtnl(void);
 138 static void addrconf_verify_work(struct work_struct *);
 139
 140 static struct workqueue_struct *addrconf_wq;
 141 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 142
 143 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 144 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 145
 146 static void addrconf_type_change(struct net_device *dev,
 147                                  unsigned long event);
 148 static int addrconf_ifdown(struct net_device *dev, int how);
 149
 150 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 151                                                   int plen,
 152                                                   const struct net_device *dev,
 153                                                   u32 flags, u32 noflags);
 154
 155 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 156 static void addrconf_dad_work(struct work_struct *w);
 157 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 158 static void addrconf_dad_run(struct inet6_dev *idev);
 159 static void addrconf_rs_timer(unsigned long data);
 160 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 161 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 162
 163 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 164                                 struct prefix_info *pinfo);
 165 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 166                                struct net_device *dev);
 167
 168 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 169         .forwarding             = 0,
 170         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 171         .mtu6                   = IPV6_MIN_MTU,
 172         .accept_ra              = 1,
 173         .accept_redirects       = 1,
 174         .autoconf               = 1,
 175         .force_mld_version      = 0,
 176         .mldv1_unsolicited_report_interval = 10 * HZ,
 177         .mldv2_unsolicited_report_interval = HZ,
 178         .dad_transmits          = 1,
 179         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 180         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 181         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 182         .use_tempaddr           = 0,
 183         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 184         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 185         .regen_max_retry        = REGEN_MAX_RETRY,
 186         .max_desync_factor      = MAX_DESYNC_FACTOR,
 187         .max_addresses          = IPV6_MAX_ADDRESSES,
 188         .accept_ra_defrtr       = 1,
 189         .accept_ra_pinfo        = 1,
 190 #ifdef CONFIG_IPV6_ROUTER_PREF
 191         .accept_ra_rtr_pref     = 1,
 192         .rtr_probe_interval     = 60 * HZ,
 193 #ifdef CONFIG_IPV6_ROUTE_INFO
 194         .accept_ra_rt_info_max_plen = 0,
 195 #endif
 196 #endif
 197         .proxy_ndp              = 0,
 198         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 199         .disable_ipv6           = 0,
 200         .accept_dad             = 1,
 201         .suppress_frag_ndisc    = 1,
 202 };
 203
 204 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 205         .forwarding             = 0,
 206         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 207         .mtu6                   = IPV6_MIN_MTU,
 208         .accept_ra              = 1,
 209         .accept_redirects       = 1,
 210         .autoconf               = 1,
 211         .force_mld_version      = 0,
 212         .mldv1_unsolicited_report_interval = 10 * HZ,
 213         .mldv2_unsolicited_report_interval = HZ,
 214         .dad_transmits          = 1,
 215         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 216         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 217         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 218         .use_tempaddr           = 0,
 219         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 220         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 221         .regen_max_retry        = REGEN_MAX_RETRY,
 222         .max_desync_factor      = MAX_DESYNC_FACTOR,
 223         .max_addresses          = IPV6_MAX_ADDRESSES,
 224         .accept_ra_defrtr       = 1,
 225         .accept_ra_pinfo        = 1,
 226 #ifdef CONFIG_IPV6_ROUTER_PREF
 227         .accept_ra_rtr_pref     = 1,
 228         .rtr_probe_interval     = 60 * HZ,
 229 #ifdef CONFIG_IPV6_ROUTE_INFO
 230         .accept_ra_rt_info_max_plen = 0,
 231 #endif
 232 #endif
 233         .proxy_ndp              = 0,
 234         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 235         .disable_ipv6           = 0,
 236         .accept_dad             = 1,
 237         .suppress_frag_ndisc    = 1,
 238 };
 239
 240 /* Check if a valid qdisc is available */
 241 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 242 {
 243         return !qdisc_tx_is_noop(dev);
 244 }
 245
 246 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 247 {
 248         if (del_timer(&idev->rs_timer))
 249                 __in6_dev_put(idev);
 250 }
 251
 252 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 253 {
 254         if (cancel_delayed_work(&ifp->dad_work))
 255                 __in6_ifa_put(ifp);
 256 }
 257
 258 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 259                                   unsigned long when)
 260 {
 261         if (!timer_pending(&idev->rs_timer))
 262                 in6_dev_hold(idev);
 263         mod_timer(&idev->rs_timer, jiffies + when);
 264 }
 265
 266 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 267                                    unsigned long delay)
 268 {
 269         if (!delayed_work_pending(&ifp->dad_work))
 270                 in6_ifa_hold(ifp);
 271         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 272 }
 273
 274 static int snmp6_alloc_dev(struct inet6_dev *idev)
 275 {
 276         int i;
 277
 278         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 279                           sizeof(struct ipstats_mib),
 280                           __alignof__(struct ipstats_mib)) < 0)
 281                 goto err_ip;
 282
 283         for_each_possible_cpu(i) {
 284                 struct ipstats_mib *addrconf_stats;
 285                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
 286                 u64_stats_init(&addrconf_stats->syncp);
 287 #if SNMP_ARRAY_SZ == 2
 288                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
 289                 u64_stats_init(&addrconf_stats->syncp);
 290 #endif
 291         }
 292
 293
 294         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 295                                         GFP_KERNEL);
 296         if (!idev->stats.icmpv6dev)
 297                 goto err_icmp;
 298         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 299                                            GFP_KERNEL);
 300         if (!idev->stats.icmpv6msgdev)
 301                 goto err_icmpmsg;
 302
 303         return 0;
 304
 305 err_icmpmsg:
 306         kfree(idev->stats.icmpv6dev);
 307 err_icmp:
 308         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 309 err_ip:
 310         return -ENOMEM;
 311 }
 312
 313 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 314 {
 315         struct inet6_dev *ndev;
 316
 317         ASSERT_RTNL();
 318
 319         if (dev->mtu < IPV6_MIN_MTU)
 320                 return NULL;
 321
 322         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 323
 324         if (ndev == NULL)
 325                 return NULL;
 326
 327         rwlock_init(&ndev->lock);
 328         ndev->dev = dev;
 329         INIT_LIST_HEAD(&ndev->addr_list);
 330         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 331                     (unsigned long)ndev);
 332         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 333         ndev->cnf.mtu6 = dev->mtu;
 334         ndev->cnf.sysctl = NULL;
 335         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 336         if (ndev->nd_parms == NULL) {
 337                 kfree(ndev);
 338                 return NULL;
 339         }
 340         if (ndev->cnf.forwarding)
 341                 dev_disable_lro(dev);
 342         /* We refer to the device */
 343         dev_hold(dev);
 344
 345         if (snmp6_alloc_dev(ndev) < 0) {
 346                 ADBG(KERN_WARNING
 347                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 348                         __func__, dev->name);
 349                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 350                 dev_put(dev);
 351                 kfree(ndev);
 352                 return NULL;
 353         }
 354
 355         if (snmp6_register_dev(ndev) < 0) {
 356                 ADBG(KERN_WARNING
 357                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 358                         __func__, dev->name);
 359                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 360                 ndev->dead = 1;
 361                 in6_dev_finish_destroy(ndev);
 362                 return NULL;
 363         }
 364
 365         /* One reference from device.  We must do this before
 366          * we invoke __ipv6_regen_rndid().
 367          */
 368         in6_dev_hold(ndev);
 369
 370         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 371                 ndev->cnf.accept_dad = -1;
 372
 373 #if IS_ENABLED(CONFIG_IPV6_SIT)
 374         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 375                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 376                 ndev->cnf.rtr_solicits = 0;
 377         }
 378 #endif
 379
 380         INIT_LIST_HEAD(&ndev->tempaddr_list);
 381         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 382         if ((dev->flags&IFF_LOOPBACK) ||
 383             dev->type == ARPHRD_TUNNEL ||
 384             dev->type == ARPHRD_TUNNEL6 ||
 385             dev->type == ARPHRD_SIT ||
 386             dev->type == ARPHRD_NONE) {
 387                 ndev->cnf.use_tempaddr = -1;
 388         } else {
 389                 in6_dev_hold(ndev);
 390                 ipv6_regen_rndid((unsigned long) ndev);
 391         }
 392
 393         ndev->token = in6addr_any;
 394
 395         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 396                 ndev->if_flags |= IF_READY;
 397
 398         ipv6_mc_init_dev(ndev);
 399         ndev->tstamp = jiffies;
 400         addrconf_sysctl_register(ndev);
 401         /* protected by rtnl_lock */
 402         rcu_assign_pointer(dev->ip6_ptr, ndev);
 403
 404         /* Join interface-local all-node multicast group */
 405         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 406
 407         /* Join all-node multicast group */
 408         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 409
 410         /* Join all-router multicast group if forwarding is set */
 411         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 412                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 413
 414         return ndev;
 415 }
 416
 417 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 418 {
 419         struct inet6_dev *idev;
 420
 421         ASSERT_RTNL();
 422
 423         idev = __in6_dev_get(dev);
 424         if (!idev) {
 425                 idev = ipv6_add_dev(dev);
 426                 if (!idev)
 427                         return NULL;
 428         }
 429
 430         if (dev->flags&IFF_UP)
 431                 ipv6_mc_up(idev);
 432         return idev;
 433 }
 434
 435 static int inet6_netconf_msgsize_devconf(int type)
 436 {
 437         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 438                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 439
 440         /* type -1 is used for ALL */
 441         if (type == -1 || type == NETCONFA_FORWARDING)
 442                 size += nla_total_size(4);
 443 #ifdef CONFIG_IPV6_MROUTE
 444         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 445                 size += nla_total_size(4);
 446 #endif
 447         if (type == -1 || type == NETCONFA_PROXY_NEIGH)
 448                 size += nla_total_size(4);
 449
 450         return size;
 451 }
 452
 453 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 454                                       struct ipv6_devconf *devconf, u32 portid,
 455                                       u32 seq, int event, unsigned int flags,
 456                                       int type)
 457 {
 458         struct nlmsghdr  *nlh;
 459         struct netconfmsg *ncm;
 460
 461         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 462                         flags);
 463         if (nlh == NULL)
 464                 return -EMSGSIZE;
 465
 466         ncm = nlmsg_data(nlh);
 467         ncm->ncm_family = AF_INET6;
 468
 469         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 470                 goto nla_put_failure;
 471
 472         /* type -1 is used for ALL */
 473         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 474             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 475                 goto nla_put_failure;
 476 #ifdef CONFIG_IPV6_MROUTE
 477         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 478             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 479                         devconf->mc_forwarding) < 0)
 480                 goto nla_put_failure;
 481 #endif
 482         if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
 483             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 484                 goto nla_put_failure;
 485
 486         return nlmsg_end(skb, nlh);
 487
 488 nla_put_failure:
 489         nlmsg_cancel(skb, nlh);
 490         return -EMSGSIZE;
 491 }
 492
 493 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 494                                   struct ipv6_devconf *devconf)
 495 {
 496         struct sk_buff *skb;
 497         int err = -ENOBUFS;
 498
 499         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 500         if (skb == NULL)
 501                 goto errout;
 502
 503         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 504                                          RTM_NEWNETCONF, 0, type);
 505         if (err < 0) {
 506                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 507                 WARN_ON(err == -EMSGSIZE);
 508                 kfree_skb(skb);
 509                 goto errout;
 510         }
 511         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 512         return;
 513 errout:
 514         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 515 }
 516
 517 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 518         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 519         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 520         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 521 };
 522
 523 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 524                                      struct nlmsghdr *nlh)
 525 {
 526         struct net *net = sock_net(in_skb->sk);
 527         struct nlattr *tb[NETCONFA_MAX+1];
 528         struct netconfmsg *ncm;
 529         struct sk_buff *skb;
 530         struct ipv6_devconf *devconf;
 531         struct inet6_dev *in6_dev;
 532         struct net_device *dev;
 533         int ifindex;
 534         int err;
 535
 536         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 537                           devconf_ipv6_policy);
 538         if (err < 0)
 539                 goto errout;
 540
 541         err = EINVAL;
 542         if (!tb[NETCONFA_IFINDEX])
 543                 goto errout;
 544
 545         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 546         switch (ifindex) {
 547         case NETCONFA_IFINDEX_ALL:
 548                 devconf = net->ipv6.devconf_all;
 549                 break;
 550         case NETCONFA_IFINDEX_DEFAULT:
 551                 devconf = net->ipv6.devconf_dflt;
 552                 break;
 553         default:
 554                 dev = __dev_get_by_index(net, ifindex);
 555                 if (dev == NULL)
 556                         goto errout;
 557                 in6_dev = __in6_dev_get(dev);
 558                 if (in6_dev == NULL)
 559                         goto errout;
 560                 devconf = &in6_dev->cnf;
 561                 break;
 562         }
 563
 564         err = -ENOBUFS;
 565         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 566         if (skb == NULL)
 567                 goto errout;
 568
 569         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 570                                          NETLINK_CB(in_skb).portid,
 571                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 572                                          -1);
 573         if (err < 0) {
 574                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 575                 WARN_ON(err == -EMSGSIZE);
 576                 kfree_skb(skb);
 577                 goto errout;
 578         }
 579         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 580 errout:
 581         return err;
 582 }
 583
 584 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 585                                       struct netlink_callback *cb)
 586 {
 587         struct net *net = sock_net(skb->sk);
 588         int h, s_h;
 589         int idx, s_idx;
 590         struct net_device *dev;
 591         struct inet6_dev *idev;
 592         struct hlist_head *head;
 593
 594         s_h = cb->args[0];
 595         s_idx = idx = cb->args[1];
 596
 597         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 598                 idx = 0;
 599                 head = &net->dev_index_head[h];
 600                 rcu_read_lock();
 601                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 602                           net->dev_base_seq;
 603                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 604                         if (idx < s_idx)
 605                                 goto cont;
 606                         idev = __in6_dev_get(dev);
 607                         if (!idev)
 608                                 goto cont;
 609
 610                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 611                                                        &idev->cnf,
 612                                                        NETLINK_CB(cb->skb).portid,
 613                                                        cb->nlh->nlmsg_seq,
 614                                                        RTM_NEWNETCONF,
 615                                                        NLM_F_MULTI,
 616                                                        -1) <= 0) {
 617                                 rcu_read_unlock();
 618                                 goto done;
 619                         }
 620                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 621 cont:
 622                         idx++;
 623                 }
 624                 rcu_read_unlock();
 625         }
 626         if (h == NETDEV_HASHENTRIES) {
 627                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 628                                                net->ipv6.devconf_all,
 629                                                NETLINK_CB(cb->skb).portid,
 630                                                cb->nlh->nlmsg_seq,
 631                                                RTM_NEWNETCONF, NLM_F_MULTI,
 632                                                -1) <= 0)
 633                         goto done;
 634                 else
 635                         h++;
 636         }
 637         if (h == NETDEV_HASHENTRIES + 1) {
 638                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 639                                                net->ipv6.devconf_dflt,
 640                                                NETLINK_CB(cb->skb).portid,
 641                                                cb->nlh->nlmsg_seq,
 642                                                RTM_NEWNETCONF, NLM_F_MULTI,
 643                                                -1) <= 0)
 644                         goto done;
 645                 else
 646                         h++;
 647         }
 648 done:
 649         cb->args[0] = h;
 650         cb->args[1] = idx;
 651
 652         return skb->len;
 653 }
 654
 655 #ifdef CONFIG_SYSCTL
 656 static void dev_forward_change(struct inet6_dev *idev)
 657 {
 658         struct net_device *dev;
 659         struct inet6_ifaddr *ifa;
 660
 661         if (!idev)
 662                 return;
 663         dev = idev->dev;
 664         if (idev->cnf.forwarding)
 665                 dev_disable_lro(dev);
 666         if (dev->flags & IFF_MULTICAST) {
 667                 if (idev->cnf.forwarding) {
 668                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 669                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 670                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 671                 } else {
 672                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 673                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 674                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 675                 }
 676         }
 677
 678         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 679                 if (ifa->flags&IFA_F_TENTATIVE)
 680                         continue;
 681                 if (idev->cnf.forwarding)
 682                         addrconf_join_anycast(ifa);
 683                 else
 684                         addrconf_leave_anycast(ifa);
 685         }
 686         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 687                                      dev->ifindex, &idev->cnf);
 688 }
 689
 690
 691 static void addrconf_forward_change(struct net *net, __s32 newf)
 692 {
 693         struct net_device *dev;
 694         struct inet6_dev *idev;
 695
 696         for_each_netdev(net, dev) {
 697                 idev = __in6_dev_get(dev);
 698                 if (idev) {
 699                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 700                         idev->cnf.forwarding = newf;
 701                         if (changed)
 702                                 dev_forward_change(idev);
 703                 }
 704         }
 705 }
 706
 707 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 708 {
 709         struct net *net;
 710         int old;
 711
 712         if (!rtnl_trylock())
 713                 return restart_syscall();
 714
 715         net = (struct net *)table->extra2;
 716         old = *p;
 717         *p = newf;
 718
 719         if (p == &net->ipv6.devconf_dflt->forwarding) {
 720                 if ((!newf) ^ (!old))
 721                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 722                                                      NETCONFA_IFINDEX_DEFAULT,
 723                                                      net->ipv6.devconf_dflt);
 724                 rtnl_unlock();
 725                 return 0;
 726         }
 727
 728         if (p == &net->ipv6.devconf_all->forwarding) {
 729                 net->ipv6.devconf_dflt->forwarding = newf;
 730                 addrconf_forward_change(net, newf);
 731                 if ((!newf) ^ (!old))
 732                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 733                                                      NETCONFA_IFINDEX_ALL,
 734                                                      net->ipv6.devconf_all);
 735         } else if ((!newf) ^ (!old))
 736                 dev_forward_change((struct inet6_dev *)table->extra1);
 737         rtnl_unlock();
 738
 739         if (newf)
 740                 rt6_purge_dflt_routers(net);
 741         return 1;
 742 }
 743 #endif
 744
 745 /* Nobody refers to this ifaddr, destroy it */
 746 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 747 {
 748         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 749
 750 #ifdef NET_REFCNT_DEBUG
 751         pr_debug("%s\n", __func__);
 752 #endif
 753
 754         in6_dev_put(ifp->idev);
 755
 756         if (cancel_delayed_work(&ifp->dad_work))
 757                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 758                           ifp);
 759
 760         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 761                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 762                 return;
 763         }
 764         ip6_rt_put(ifp->rt);
 765
 766         kfree_rcu(ifp, rcu);
 767 }
 768
 769 static void
 770 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 771 {
 772         struct list_head *p;
 773         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 774
 775         /*
 776          * Each device address list is sorted in order of scope -
 777          * global before linklocal.
 778          */
 779         list_for_each(p, &idev->addr_list) {
 780                 struct inet6_ifaddr *ifa
 781                         = list_entry(p, struct inet6_ifaddr, if_list);
 782                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 783                         break;
 784         }
 785
 786         list_add_tail(&ifp->if_list, p);
 787 }
 788
 789 static u32 inet6_addr_hash(const struct in6_addr *addr)
 790 {
 791         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 792 }
 793
 794 /* On success it returns ifp with increased reference count */
 795
 796 static struct inet6_ifaddr *
 797 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 798               const struct in6_addr *peer_addr, int pfxlen,
 799               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 800 {
 801         struct inet6_ifaddr *ifa = NULL;
 802         struct rt6_info *rt;
 803         unsigned int hash;
 804         int err = 0;
 805         int addr_type = ipv6_addr_type(addr);
 806
 807         if (addr_type == IPV6_ADDR_ANY ||
 808             addr_type & IPV6_ADDR_MULTICAST ||
 809             (!(idev->dev->flags & IFF_LOOPBACK) &&
 810              addr_type & IPV6_ADDR_LOOPBACK))
 811                 return ERR_PTR(-EADDRNOTAVAIL);
 812
 813         rcu_read_lock_bh();
 814         if (idev->dead) {
 815                 err = -ENODEV;                  /*XXX*/
 816                 goto out2;
 817         }
 818
 819         if (idev->cnf.disable_ipv6) {
 820                 err = -EACCES;
 821                 goto out2;
 822         }
 823
 824         spin_lock(&addrconf_hash_lock);
 825
 826         /* Ignore adding duplicate addresses on an interface */
 827         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 828                 ADBG("ipv6_add_addr: already assigned\n");
 829                 err = -EEXIST;
 830                 goto out;
 831         }
 832
 833         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 834
 835         if (ifa == NULL) {
 836                 ADBG("ipv6_add_addr: malloc failed\n");
 837                 err = -ENOBUFS;
 838                 goto out;
 839         }
 840
 841         rt = addrconf_dst_alloc(idev, addr, false);
 842         if (IS_ERR(rt)) {
 843                 err = PTR_ERR(rt);
 844                 goto out;
 845         }
 846
 847         neigh_parms_data_state_setall(idev->nd_parms);
 848
 849         ifa->addr = *addr;
 850         if (peer_addr)
 851                 ifa->peer_addr = *peer_addr;
 852
 853         spin_lock_init(&ifa->lock);
 854         spin_lock_init(&ifa->state_lock);
 855         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 856         INIT_HLIST_NODE(&ifa->addr_lst);
 857         ifa->scope = scope;
 858         ifa->prefix_len = pfxlen;
 859         ifa->flags = flags | IFA_F_TENTATIVE;
 860         ifa->valid_lft = valid_lft;
 861         ifa->prefered_lft = prefered_lft;
 862         ifa->cstamp = ifa->tstamp = jiffies;
 863         ifa->tokenized = false;
 864
 865         ifa->rt = rt;
 866
 867         ifa->idev = idev;
 868         in6_dev_hold(idev);
 869         /* For caller */
 870         in6_ifa_hold(ifa);
 871
 872         /* Add to big hash table */
 873         hash = inet6_addr_hash(addr);
 874
 875         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 876         spin_unlock(&addrconf_hash_lock);
 877
 878         write_lock(&idev->lock);
 879         /* Add to inet6_dev unicast addr list. */
 880         ipv6_link_dev_addr(idev, ifa);
 881
 882         if (ifa->flags&IFA_F_TEMPORARY) {
 883                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 884                 in6_ifa_hold(ifa);
 885         }
 886
 887         in6_ifa_hold(ifa);
 888         write_unlock(&idev->lock);
 889 out2:
 890         rcu_read_unlock_bh();
 891
 892         if (likely(err == 0))
 893                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 894         else {
 895                 kfree(ifa);
 896                 ifa = ERR_PTR(err);
 897         }
 898
 899         return ifa;
 900 out:
 901         spin_unlock(&addrconf_hash_lock);
 902         goto out2;
 903 }
 904
 905 enum cleanup_prefix_rt_t {
 906         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
 907         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
 908         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
 909 };
 910
 911 /*
 912  * Check, whether the prefix for ifp would still need a prefix route
 913  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
 914  * constants.
 915  *
 916  * 1) we don't purge prefix if address was not permanent.
 917  *    prefix is managed by its own lifetime.
 918  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
 919  * 3) if there are no addresses, delete prefix.
 920  * 4) if there are still other permanent address(es),
 921  *    corresponding prefix is still permanent.
 922  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
 923  *    don't purge the prefix, assume user space is managing it.
 924  * 6) otherwise, update prefix lifetime to the
 925  *    longest valid lifetime among the corresponding
 926  *    addresses on the device.
 927  *    Note: subsequent RA will update lifetime.
 928  **/
 929 static enum cleanup_prefix_rt_t
 930 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
 931 {
 932         struct inet6_ifaddr *ifa;
 933         struct inet6_dev *idev = ifp->idev;
 934         unsigned long lifetime;
 935         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
 936
 937         *expires = jiffies;
 938
 939         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 940                 if (ifa == ifp)
 941                         continue;
 942                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 943                                        ifp->prefix_len))
 944                         continue;
 945                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
 946                         return CLEANUP_PREFIX_RT_NOP;
 947
 948                 action = CLEANUP_PREFIX_RT_EXPIRE;
 949
 950                 spin_lock(&ifa->lock);
 951
 952                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 953                 /*
 954                  * Note: Because this address is
 955                  * not permanent, lifetime <
 956                  * LONG_MAX / HZ here.
 957                  */
 958                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
 959                         *expires = ifa->tstamp + lifetime * HZ;
 960                 spin_unlock(&ifa->lock);
 961         }
 962
 963         return action;
 964 }
 965
 966 static void
 967 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
 968 {
 969         struct rt6_info *rt;
 970
 971         rt = addrconf_get_prefix_route(&ifp->addr,
 972                                        ifp->prefix_len,
 973                                        ifp->idev->dev,
 974                                        0, RTF_GATEWAY | RTF_DEFAULT);
 975         if (rt) {
 976                 if (del_rt)
 977                         ip6_del_rt(rt);
 978                 else {
 979                         if (!(rt->rt6i_flags & RTF_EXPIRES))
 980                                 rt6_set_expires(rt, expires);
 981                         ip6_rt_put(rt);
 982                 }
 983         }
 984 }
 985
 986
 987 /* This function wants to get referenced ifp and releases it before return */
 988
 989 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 990 {
 991         int state;
 992         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
 993         unsigned long expires;
 994
 995         ASSERT_RTNL();
 996
 997         spin_lock_bh(&ifp->state_lock);
 998         state = ifp->state;
 999         ifp->state = INET6_IFADDR_STATE_DEAD;
1000         spin_unlock_bh(&ifp->state_lock);
1001
1002         if (state == INET6_IFADDR_STATE_DEAD)
1003                 goto out;
1004
1005         spin_lock_bh(&addrconf_hash_lock);
1006         hlist_del_init_rcu(&ifp->addr_lst);
1007         spin_unlock_bh(&addrconf_hash_lock);
1008
1009         write_lock_bh(&ifp->idev->lock);
1010
1011         if (ifp->flags&IFA_F_TEMPORARY) {
1012                 list_del(&ifp->tmp_list);
1013                 if (ifp->ifpub) {
1014                         in6_ifa_put(ifp->ifpub);
1015                         ifp->ifpub = NULL;
1016                 }
1017                 __in6_ifa_put(ifp);
1018         }
1019
1020         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1021                 action = check_cleanup_prefix_route(ifp, &expires);
1022
1023         list_del_init(&ifp->if_list);
1024         __in6_ifa_put(ifp);
1025
1026         write_unlock_bh(&ifp->idev->lock);
1027
1028         addrconf_del_dad_work(ifp);
1029
1030         ipv6_ifa_notify(RTM_DELADDR, ifp);
1031
1032         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1033
1034         if (action != CLEANUP_PREFIX_RT_NOP) {
1035                 cleanup_prefix_route(ifp, expires,
1036                         action == CLEANUP_PREFIX_RT_DEL);
1037         }
1038
1039         /* clean up prefsrc entries */
1040         rt6_remove_prefsrc(ifp);
1041 out:
1042         in6_ifa_put(ifp);
1043 }
1044
1045 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1046 {
1047         struct inet6_dev *idev = ifp->idev;
1048         struct in6_addr addr, *tmpaddr;
1049         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1050         unsigned long regen_advance;
1051         int tmp_plen;
1052         int ret = 0;
1053         u32 addr_flags;
1054         unsigned long now = jiffies;
1055
1056         write_lock_bh(&idev->lock);
1057         if (ift) {
1058                 spin_lock_bh(&ift->lock);
1059                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1060                 spin_unlock_bh(&ift->lock);
1061                 tmpaddr = &addr;
1062         } else {
1063                 tmpaddr = NULL;
1064         }
1065 retry:
1066         in6_dev_hold(idev);
1067         if (idev->cnf.use_tempaddr <= 0) {
1068                 write_unlock_bh(&idev->lock);
1069                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1070                 in6_dev_put(idev);
1071                 ret = -1;
1072                 goto out;
1073         }
1074         spin_lock_bh(&ifp->lock);
1075         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1076                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1077                 spin_unlock_bh(&ifp->lock);
1078                 write_unlock_bh(&idev->lock);
1079                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1080                         __func__);
1081                 in6_dev_put(idev);
1082                 ret = -1;
1083                 goto out;
1084         }
1085         in6_ifa_hold(ifp);
1086         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1087         __ipv6_try_regen_rndid(idev, tmpaddr);
1088         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1089         age = (now - ifp->tstamp) / HZ;
1090         tmp_valid_lft = min_t(__u32,
1091                               ifp->valid_lft,
1092                               idev->cnf.temp_valid_lft + age);
1093         tmp_prefered_lft = min_t(__u32,
1094                                  ifp->prefered_lft,
1095                                  idev->cnf.temp_prefered_lft + age -
1096                                  idev->cnf.max_desync_factor);
1097         tmp_plen = ifp->prefix_len;
1098         tmp_tstamp = ifp->tstamp;
1099         spin_unlock_bh(&ifp->lock);
1100
1101         regen_advance = idev->cnf.regen_max_retry *
1102                         idev->cnf.dad_transmits *
1103                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1104         write_unlock_bh(&idev->lock);
1105
1106         /* A temporary address is created only if this calculated Preferred
1107          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1108          * an implementation must not create a temporary address with a zero
1109          * Preferred Lifetime.
1110          * Use age calculation as in addrconf_verify to avoid unnecessary
1111          * temporary addresses being generated.
1112          */
1113         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1114         if (tmp_prefered_lft <= regen_advance + age) {
1115                 in6_ifa_put(ifp);
1116                 in6_dev_put(idev);
1117                 ret = -1;
1118                 goto out;
1119         }
1120
1121         addr_flags = IFA_F_TEMPORARY;
1122         /* set in addrconf_prefix_rcv() */
1123         if (ifp->flags & IFA_F_OPTIMISTIC)
1124                 addr_flags |= IFA_F_OPTIMISTIC;
1125
1126         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1127                             ipv6_addr_scope(&addr), addr_flags,
1128                             tmp_valid_lft, tmp_prefered_lft);
1129         if (IS_ERR(ift)) {
1130                 in6_ifa_put(ifp);
1131                 in6_dev_put(idev);
1132                 pr_info("%s: retry temporary address regeneration\n", __func__);
1133                 tmpaddr = &addr;
1134                 write_lock_bh(&idev->lock);
1135                 goto retry;
1136         }
1137
1138         spin_lock_bh(&ift->lock);
1139         ift->ifpub = ifp;
1140         ift->cstamp = now;
1141         ift->tstamp = tmp_tstamp;
1142         spin_unlock_bh(&ift->lock);
1143
1144         addrconf_dad_start(ift);
1145         in6_ifa_put(ift);
1146         in6_dev_put(idev);
1147 out:
1148         return ret;
1149 }
1150
1151 /*
1152  *      Choose an appropriate source address (RFC3484)
1153  */
1154 enum {
1155         IPV6_SADDR_RULE_INIT = 0,
1156         IPV6_SADDR_RULE_LOCAL,
1157         IPV6_SADDR_RULE_SCOPE,
1158         IPV6_SADDR_RULE_PREFERRED,
1159 #ifdef CONFIG_IPV6_MIP6
1160         IPV6_SADDR_RULE_HOA,
1161 #endif
1162         IPV6_SADDR_RULE_OIF,
1163         IPV6_SADDR_RULE_LABEL,
1164         IPV6_SADDR_RULE_PRIVACY,
1165         IPV6_SADDR_RULE_ORCHID,
1166         IPV6_SADDR_RULE_PREFIX,
1167         IPV6_SADDR_RULE_MAX
1168 };
1169
1170 struct ipv6_saddr_score {
1171         int                     rule;
1172         int                     addr_type;
1173         struct inet6_ifaddr     *ifa;
1174         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1175         int                     scopedist;
1176         int                     matchlen;
1177 };
1178
1179 struct ipv6_saddr_dst {
1180         const struct in6_addr *addr;
1181         int ifindex;
1182         int scope;
1183         int label;
1184         unsigned int prefs;
1185 };
1186
1187 static inline int ipv6_saddr_preferred(int type)
1188 {
1189         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1190                 return 1;
1191         return 0;
1192 }
1193
1194 static int ipv6_get_saddr_eval(struct net *net,
1195                                struct ipv6_saddr_score *score,
1196                                struct ipv6_saddr_dst *dst,
1197                                int i)
1198 {
1199         int ret;
1200
1201         if (i <= score->rule) {
1202                 switch (i) {
1203                 case IPV6_SADDR_RULE_SCOPE:
1204                         ret = score->scopedist;
1205                         break;
1206                 case IPV6_SADDR_RULE_PREFIX:
1207                         ret = score->matchlen;
1208                         break;
1209                 default:
1210                         ret = !!test_bit(i, score->scorebits);
1211                 }
1212                 goto out;
1213         }
1214
1215         switch (i) {
1216         case IPV6_SADDR_RULE_INIT:
1217                 /* Rule 0: remember if hiscore is not ready yet */
1218                 ret = !!score->ifa;
1219                 break;
1220         case IPV6_SADDR_RULE_LOCAL:
1221                 /* Rule 1: Prefer same address */
1222                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1223                 break;
1224         case IPV6_SADDR_RULE_SCOPE:
1225                 /* Rule 2: Prefer appropriate scope
1226                  *
1227                  *      ret
1228                  *       ^
1229                  *    -1 |  d 15
1230                  *    ---+--+-+---> scope
1231                  *       |
1232                  *       |             d is scope of the destination.
1233                  *  B-d  |  \
1234                  *       |   \      <- smaller scope is better if
1235                  *  B-15 |    \        if scope is enough for destination.
1236                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1237                  * d-C-1 | /
1238                  *       |/         <- greater is better
1239                  *   -C  /             if scope is not enough for destination.
1240                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1241                  *
1242                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1243                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1244                  * Assume B = 0 and we get C > 29.
1245                  */
1246                 ret = __ipv6_addr_src_scope(score->addr_type);
1247                 if (ret >= dst->scope)
1248                         ret = -ret;
1249                 else
1250                         ret -= 128;     /* 30 is enough */
1251                 score->scopedist = ret;
1252                 break;
1253         case IPV6_SADDR_RULE_PREFERRED:
1254                 /* Rule 3: Avoid deprecated and optimistic addresses */
1255                 ret = ipv6_saddr_preferred(score->addr_type) ||
1256                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1257                 break;
1258 #ifdef CONFIG_IPV6_MIP6
1259         case IPV6_SADDR_RULE_HOA:
1260             {
1261                 /* Rule 4: Prefer home address */
1262                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1263                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1264                 break;
1265             }
1266 #endif
1267         case IPV6_SADDR_RULE_OIF:
1268                 /* Rule 5: Prefer outgoing interface */
1269                 ret = (!dst->ifindex ||
1270                        dst->ifindex == score->ifa->idev->dev->ifindex);
1271                 break;
1272         case IPV6_SADDR_RULE_LABEL:
1273                 /* Rule 6: Prefer matching label */
1274                 ret = ipv6_addr_label(net,
1275                                       &score->ifa->addr, score->addr_type,
1276                                       score->ifa->idev->dev->ifindex) == dst->label;
1277                 break;
1278         case IPV6_SADDR_RULE_PRIVACY:
1279             {
1280                 /* Rule 7: Prefer public address
1281                  * Note: prefer temporary address if use_tempaddr >= 2
1282                  */
1283                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1284                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1285                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1286                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1287                 break;
1288             }
1289         case IPV6_SADDR_RULE_ORCHID:
1290                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1291                  *          non-ORCHID vs non-ORCHID
1292                  */
1293                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1294                         ipv6_addr_orchid(dst->addr));
1295                 break;
1296         case IPV6_SADDR_RULE_PREFIX:
1297                 /* Rule 8: Use longest matching prefix */
1298                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1299                 if (ret > score->ifa->prefix_len)
1300                         ret = score->ifa->prefix_len;
1301                 score->matchlen = ret;
1302                 break;
1303         default:
1304                 ret = 0;
1305         }
1306
1307         if (ret)
1308                 __set_bit(i, score->scorebits);
1309         score->rule = i;
1310 out:
1311         return ret;
1312 }
1313
1314 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1315                        const struct in6_addr *daddr, unsigned int prefs,
1316                        struct in6_addr *saddr)
1317 {
1318         struct ipv6_saddr_score scores[2],
1319                                 *score = &scores[0], *hiscore = &scores[1];
1320         struct ipv6_saddr_dst dst;
1321         struct net_device *dev;
1322         int dst_type;
1323
1324         dst_type = __ipv6_addr_type(daddr);
1325         dst.addr = daddr;
1326         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1327         dst.scope = __ipv6_addr_src_scope(dst_type);
1328         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1329         dst.prefs = prefs;
1330
1331         hiscore->rule = -1;
1332         hiscore->ifa = NULL;
1333
1334         rcu_read_lock();
1335
1336         for_each_netdev_rcu(net, dev) {
1337                 struct inet6_dev *idev;
1338
1339                 /* Candidate Source Address (section 4)
1340                  *  - multicast and link-local destination address,
1341                  *    the set of candidate source address MUST only
1342                  *    include addresses assigned to interfaces
1343                  *    belonging to the same link as the outgoing
1344                  *    interface.
1345                  * (- For site-local destination addresses, the
1346                  *    set of candidate source addresses MUST only
1347                  *    include addresses assigned to interfaces
1348                  *    belonging to the same site as the outgoing
1349                  *    interface.)
1350                  */
1351                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1352                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1353                     dst.ifindex && dev->ifindex != dst.ifindex)
1354                         continue;
1355
1356                 idev = __in6_dev_get(dev);
1357                 if (!idev)
1358                         continue;
1359
1360                 read_lock_bh(&idev->lock);
1361                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1362                         int i;
1363
1364                         /*
1365                          * - Tentative Address (RFC2462 section 5.4)
1366                          *  - A tentative address is not considered
1367                          *    "assigned to an interface" in the traditional
1368                          *    sense, unless it is also flagged as optimistic.
1369                          * - Candidate Source Address (section 4)
1370                          *  - In any case, anycast addresses, multicast
1371                          *    addresses, and the unspecified address MUST
1372                          *    NOT be included in a candidate set.
1373                          */
1374                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1375                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1376                                 continue;
1377
1378                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1379
1380                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1381                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1382                                 LIMIT_NETDEBUG(KERN_DEBUG
1383                                                "ADDRCONF: unspecified / multicast address "
1384                                                "assigned as unicast address on %s",
1385                                                dev->name);
1386                                 continue;
1387                         }
1388
1389                         score->rule = -1;
1390                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1391
1392                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1393                                 int minihiscore, miniscore;
1394
1395                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1396                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1397
1398                                 if (minihiscore > miniscore) {
1399                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1400                                             score->scopedist > 0) {
1401                                                 /*
1402                                                  * special case:
1403                                                  * each remaining entry
1404                                                  * has too small (not enough)
1405                                                  * scope, because ifa entries
1406                                                  * are sorted by their scope
1407                                                  * values.
1408                                                  */
1409                                                 goto try_nextdev;
1410                                         }
1411                                         break;
1412                                 } else if (minihiscore < miniscore) {
1413                                         if (hiscore->ifa)
1414                                                 in6_ifa_put(hiscore->ifa);
1415
1416                                         in6_ifa_hold(score->ifa);
1417
1418                                         swap(hiscore, score);
1419
1420                                         /* restore our iterator */
1421                                         score->ifa = hiscore->ifa;
1422
1423                                         break;
1424                                 }
1425                         }
1426                 }
1427 try_nextdev:
1428                 read_unlock_bh(&idev->lock);
1429         }
1430         rcu_read_unlock();
1431
1432         if (!hiscore->ifa)
1433                 return -EADDRNOTAVAIL;
1434
1435         *saddr = hiscore->ifa->addr;
1436         in6_ifa_put(hiscore->ifa);
1437         return 0;
1438 }
1439 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1440
1441 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1442                       u32 banned_flags)
1443 {
1444         struct inet6_ifaddr *ifp;
1445         int err = -EADDRNOTAVAIL;
1446
1447         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1448                 if (ifp->scope > IFA_LINK)
1449                         break;
1450                 if (ifp->scope == IFA_LINK &&
1451                     !(ifp->flags & banned_flags)) {
1452                         *addr = ifp->addr;
1453                         err = 0;
1454                         break;
1455                 }
1456         }
1457         return err;
1458 }
1459
1460 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1461                     u32 banned_flags)
1462 {
1463         struct inet6_dev *idev;
1464         int err = -EADDRNOTAVAIL;
1465
1466         rcu_read_lock();
1467         idev = __in6_dev_get(dev);
1468         if (idev) {
1469                 read_lock_bh(&idev->lock);
1470                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1471                 read_unlock_bh(&idev->lock);
1472         }
1473         rcu_read_unlock();
1474         return err;
1475 }
1476
1477 static int ipv6_count_addresses(struct inet6_dev *idev)
1478 {
1479         int cnt = 0;
1480         struct inet6_ifaddr *ifp;
1481
1482         read_lock_bh(&idev->lock);
1483         list_for_each_entry(ifp, &idev->addr_list, if_list)
1484                 cnt++;
1485         read_unlock_bh(&idev->lock);
1486         return cnt;
1487 }
1488
1489 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1490                   const struct net_device *dev, int strict)
1491 {
1492         struct inet6_ifaddr *ifp;
1493         unsigned int hash = inet6_addr_hash(addr);
1494
1495         rcu_read_lock_bh();
1496         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1497                 if (!net_eq(dev_net(ifp->idev->dev), net))
1498                         continue;
1499                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1500                     !(ifp->flags&IFA_F_TENTATIVE) &&
1501                     (dev == NULL || ifp->idev->dev == dev ||
1502                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1503                         rcu_read_unlock_bh();
1504                         return 1;
1505                 }
1506         }
1507
1508         rcu_read_unlock_bh();
1509         return 0;
1510 }
1511 EXPORT_SYMBOL(ipv6_chk_addr);
1512
1513 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1514                                struct net_device *dev)
1515 {
1516         unsigned int hash = inet6_addr_hash(addr);
1517         struct inet6_ifaddr *ifp;
1518
1519         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1520                 if (!net_eq(dev_net(ifp->idev->dev), net))
1521                         continue;
1522                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1523                         if (dev == NULL || ifp->idev->dev == dev)
1524                                 return true;
1525                 }
1526         }
1527         return false;
1528 }
1529
1530 /* Compares an address/prefix_len with addresses on device @dev.
1531  * If one is found it returns true.
1532  */
1533 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1534         const unsigned int prefix_len, struct net_device *dev)
1535 {
1536         struct inet6_dev *idev;
1537         struct inet6_ifaddr *ifa;
1538         bool ret = false;
1539
1540         rcu_read_lock();
1541         idev = __in6_dev_get(dev);
1542         if (idev) {
1543                 read_lock_bh(&idev->lock);
1544                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1545                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1546                         if (ret)
1547                                 break;
1548                 }
1549                 read_unlock_bh(&idev->lock);
1550         }
1551         rcu_read_unlock();
1552
1553         return ret;
1554 }
1555 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1556
1557 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1558 {
1559         struct inet6_dev *idev;
1560         struct inet6_ifaddr *ifa;
1561         int     onlink;
1562
1563         onlink = 0;
1564         rcu_read_lock();
1565         idev = __in6_dev_get(dev);
1566         if (idev) {
1567                 read_lock_bh(&idev->lock);
1568                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1569                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1570                                                    ifa->prefix_len);
1571                         if (onlink)
1572                                 break;
1573                 }
1574                 read_unlock_bh(&idev->lock);
1575         }
1576         rcu_read_unlock();
1577         return onlink;
1578 }
1579 EXPORT_SYMBOL(ipv6_chk_prefix);
1580
1581 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1582                                      struct net_device *dev, int strict)
1583 {
1584         struct inet6_ifaddr *ifp, *result = NULL;
1585         unsigned int hash = inet6_addr_hash(addr);
1586
1587         rcu_read_lock_bh();
1588         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1589                 if (!net_eq(dev_net(ifp->idev->dev), net))
1590                         continue;
1591                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1592                         if (dev == NULL || ifp->idev->dev == dev ||
1593                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1594                                 result = ifp;
1595                                 in6_ifa_hold(ifp);
1596                                 break;
1597                         }
1598                 }
1599         }
1600         rcu_read_unlock_bh();
1601
1602         return result;
1603 }
1604
1605 /* Gets referenced address, destroys ifaddr */
1606
1607 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1608 {
1609         if (ifp->flags&IFA_F_PERMANENT) {
1610                 spin_lock_bh(&ifp->lock);
1611                 addrconf_del_dad_work(ifp);
1612                 ifp->flags |= IFA_F_TENTATIVE;
1613                 if (dad_failed)
1614                         ifp->flags |= IFA_F_DADFAILED;
1615                 spin_unlock_bh(&ifp->lock);
1616                 if (dad_failed)
1617                         ipv6_ifa_notify(0, ifp);
1618                 in6_ifa_put(ifp);
1619         } else if (ifp->flags&IFA_F_TEMPORARY) {
1620                 struct inet6_ifaddr *ifpub;
1621                 spin_lock_bh(&ifp->lock);
1622                 ifpub = ifp->ifpub;
1623                 if (ifpub) {
1624                         in6_ifa_hold(ifpub);
1625                         spin_unlock_bh(&ifp->lock);
1626                         ipv6_create_tempaddr(ifpub, ifp);
1627                         in6_ifa_put(ifpub);
1628                 } else {
1629                         spin_unlock_bh(&ifp->lock);
1630                 }
1631                 ipv6_del_addr(ifp);
1632         } else {
1633                 ipv6_del_addr(ifp);
1634         }
1635 }
1636
1637 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1638 {
1639         int err = -ENOENT;
1640
1641         spin_lock_bh(&ifp->state_lock);
1642         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1643                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1644                 err = 0;
1645         }
1646         spin_unlock_bh(&ifp->state_lock);
1647
1648         return err;
1649 }
1650
1651 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1652 {
1653         struct inet6_dev *idev = ifp->idev;
1654
1655         if (addrconf_dad_end(ifp)) {
1656                 in6_ifa_put(ifp);
1657                 return;
1658         }
1659
1660         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1661                              ifp->idev->dev->name, &ifp->addr);
1662
1663         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1664                 struct in6_addr addr;
1665
1666                 addr.s6_addr32[0] = htonl(0xfe800000);
1667                 addr.s6_addr32[1] = 0;
1668
1669                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1670                     ipv6_addr_equal(&ifp->addr, &addr)) {
1671                         /* DAD failed for link-local based on MAC address */
1672                         idev->cnf.disable_ipv6 = 1;
1673
1674                         pr_info("%s: IPv6 being disabled!\n",
1675                                 ifp->idev->dev->name);
1676                 }
1677         }
1678
1679         spin_lock_bh(&ifp->state_lock);
1680         /* transition from _POSTDAD to _ERRDAD */
1681         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1682         spin_unlock_bh(&ifp->state_lock);
1683
1684         addrconf_mod_dad_work(ifp, 0);
1685 }
1686
1687 /* Join to solicited addr multicast group. */
1688
1689 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1690 {
1691         struct in6_addr maddr;
1692
1693         ASSERT_RTNL();
1694
1695         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1696                 return;
1697
1698         addrconf_addr_solict_mult(addr, &maddr);
1699         ipv6_dev_mc_inc(dev, &maddr);
1700 }
1701
1702 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1703 {
1704         struct in6_addr maddr;
1705
1706         ASSERT_RTNL();
1707
1708         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1709                 return;
1710
1711         addrconf_addr_solict_mult(addr, &maddr);
1712         __ipv6_dev_mc_dec(idev, &maddr);
1713 }
1714
1715 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1716 {
1717         struct in6_addr addr;
1718
1719         ASSERT_RTNL();
1720
1721         if (ifp->prefix_len >= 127) /* RFC 6164 */
1722                 return;
1723         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1724         if (ipv6_addr_any(&addr))
1725                 return;
1726         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1727 }
1728
1729 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1730 {
1731         struct in6_addr addr;
1732
1733         ASSERT_RTNL();
1734
1735         if (ifp->prefix_len >= 127) /* RFC 6164 */
1736                 return;
1737         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1738         if (ipv6_addr_any(&addr))
1739                 return;
1740         __ipv6_dev_ac_dec(ifp->idev, &addr);
1741 }
1742
1743 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1744 {
1745         if (dev->addr_len != ETH_ALEN)
1746                 return -1;
1747         memcpy(eui, dev->dev_addr, 3);
1748         memcpy(eui + 5, dev->dev_addr + 3, 3);
1749
1750         /*
1751          * The zSeries OSA network cards can be shared among various
1752          * OS instances, but the OSA cards have only one MAC address.
1753          * This leads to duplicate address conflicts in conjunction
1754          * with IPv6 if more than one instance uses the same card.
1755          *
1756          * The driver for these cards can deliver a unique 16-bit
1757          * identifier for each instance sharing the same card.  It is
1758          * placed instead of 0xFFFE in the interface identifier.  The
1759          * "u" bit of the interface identifier is not inverted in this
1760          * case.  Hence the resulting interface identifier has local
1761          * scope according to RFC2373.
1762          */
1763         if (dev->dev_id) {
1764                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1765                 eui[4] = dev->dev_id & 0xFF;
1766         } else {
1767                 eui[3] = 0xFF;
1768                 eui[4] = 0xFE;
1769                 eui[0] ^= 2;
1770         }
1771         return 0;
1772 }
1773
1774 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1775 {
1776         if (dev->addr_len != IEEE802154_ADDR_LEN)
1777                 return -1;
1778         memcpy(eui, dev->dev_addr, 8);
1779         eui[0] ^= 2;
1780         return 0;
1781 }
1782
1783 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1784 {
1785         union fwnet_hwaddr *ha;
1786
1787         if (dev->addr_len != FWNET_ALEN)
1788                 return -1;
1789
1790         ha = (union fwnet_hwaddr *)dev->dev_addr;
1791
1792         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1793         eui[0] ^= 2;
1794         return 0;
1795 }
1796
1797 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1798 {
1799         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1800         if (dev->addr_len != ARCNET_ALEN)
1801                 return -1;
1802         memset(eui, 0, 7);
1803         eui[7] = *(u8 *)dev->dev_addr;
1804         return 0;
1805 }
1806
1807 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1808 {
1809         if (dev->addr_len != INFINIBAND_ALEN)
1810                 return -1;
1811         memcpy(eui, dev->dev_addr + 12, 8);
1812         eui[0] |= 2;
1813         return 0;
1814 }
1815
1816 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1817 {
1818         if (addr == 0)
1819                 return -1;
1820         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1821                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1822                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1823                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1824                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1825                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1826         eui[1] = 0;
1827         eui[2] = 0x5E;
1828         eui[3] = 0xFE;
1829         memcpy(eui + 4, &addr, 4);
1830         return 0;
1831 }
1832
1833 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1834 {
1835         if (dev->priv_flags & IFF_ISATAP)
1836                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1837         return -1;
1838 }
1839
1840 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1841 {
1842         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1843 }
1844
1845 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1846 {
1847         memcpy(eui, dev->perm_addr, 3);
1848         memcpy(eui + 5, dev->perm_addr + 3, 3);
1849         eui[3] = 0xFF;
1850         eui[4] = 0xFE;
1851         eui[0] ^= 2;
1852         return 0;
1853 }
1854
1855 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1856 {
1857         switch (dev->type) {
1858         case ARPHRD_ETHER:
1859         case ARPHRD_FDDI:
1860                 return addrconf_ifid_eui48(eui, dev);
1861         case ARPHRD_ARCNET:
1862                 return addrconf_ifid_arcnet(eui, dev);
1863         case ARPHRD_INFINIBAND:
1864                 return addrconf_ifid_infiniband(eui, dev);
1865         case ARPHRD_SIT:
1866                 return addrconf_ifid_sit(eui, dev);
1867         case ARPHRD_IPGRE:
1868                 return addrconf_ifid_gre(eui, dev);
1869         case ARPHRD_6LOWPAN:
1870         case ARPHRD_IEEE802154:
1871                 return addrconf_ifid_eui64(eui, dev);
1872         case ARPHRD_IEEE1394:
1873                 return addrconf_ifid_ieee1394(eui, dev);
1874         case ARPHRD_TUNNEL6:
1875                 return addrconf_ifid_ip6tnl(eui, dev);
1876         }
1877         return -1;
1878 }
1879
1880 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1881 {
1882         int err = -1;
1883         struct inet6_ifaddr *ifp;
1884
1885         read_lock_bh(&idev->lock);
1886         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1887                 if (ifp->scope > IFA_LINK)
1888                         break;
1889                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1890                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1891                         err = 0;
1892                         break;
1893                 }
1894         }
1895         read_unlock_bh(&idev->lock);
1896         return err;
1897 }
1898
1899 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1900 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1901 {
1902 regen:
1903         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1904         idev->rndid[0] &= ~0x02;
1905
1906         /*
1907          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1908          * check if generated address is not inappropriate
1909          *
1910          *  - Reserved subnet anycast (RFC 2526)
1911          *      11111101 11....11 1xxxxxxx
1912          *  - ISATAP (RFC4214) 6.1
1913          *      00-00-5E-FE-xx-xx-xx-xx
1914          *  - value 0
1915          *  - XXX: already assigned to an address on the device
1916          */
1917         if (idev->rndid[0] == 0xfd &&
1918             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1919             (idev->rndid[7]&0x80))
1920                 goto regen;
1921         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1922                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1923                         goto regen;
1924                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1925                         goto regen;
1926         }
1927 }
1928
1929 static void ipv6_regen_rndid(unsigned long data)
1930 {
1931         struct inet6_dev *idev = (struct inet6_dev *) data;
1932         unsigned long expires;
1933
1934         rcu_read_lock_bh();
1935         write_lock_bh(&idev->lock);
1936
1937         if (idev->dead)
1938                 goto out;
1939
1940         __ipv6_regen_rndid(idev);
1941
1942         expires = jiffies +
1943                 idev->cnf.temp_prefered_lft * HZ -
1944                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1945                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1946                 idev->cnf.max_desync_factor * HZ;
1947         if (time_before(expires, jiffies)) {
1948                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1949                         __func__, idev->dev->name);
1950                 goto out;
1951         }
1952
1953         if (!mod_timer(&idev->regen_timer, expires))
1954                 in6_dev_hold(idev);
1955
1956 out:
1957         write_unlock_bh(&idev->lock);
1958         rcu_read_unlock_bh();
1959         in6_dev_put(idev);
1960 }
1961
1962 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1963 {
1964         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1965                 __ipv6_regen_rndid(idev);
1966 }
1967
1968 /*
1969  *      Add prefix route.
1970  */
1971
1972 static void
1973 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1974                       unsigned long expires, u32 flags)
1975 {
1976         struct fib6_config cfg = {
1977                 .fc_table = RT6_TABLE_PREFIX,
1978                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1979                 .fc_ifindex = dev->ifindex,
1980                 .fc_expires = expires,
1981                 .fc_dst_len = plen,
1982                 .fc_flags = RTF_UP | flags,
1983                 .fc_nlinfo.nl_net = dev_net(dev),
1984                 .fc_protocol = RTPROT_KERNEL,
1985         };
1986
1987         cfg.fc_dst = *pfx;
1988
1989         /* Prevent useless cloning on PtP SIT.
1990            This thing is done here expecting that the whole
1991            class of non-broadcast devices need not cloning.
1992          */
1993 #if IS_ENABLED(CONFIG_IPV6_SIT)
1994         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1995                 cfg.fc_flags |= RTF_NONEXTHOP;
1996 #endif
1997
1998         ip6_route_add(&cfg);
1999 }
2000
2001
2002 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2003                                                   int plen,
2004                                                   const struct net_device *dev,
2005                                                   u32 flags, u32 noflags)
2006 {
2007         struct fib6_node *fn;
2008         struct rt6_info *rt = NULL;
2009         struct fib6_table *table;
2010
2011         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2012         if (table == NULL)
2013                 return NULL;
2014
2015         read_lock_bh(&table->tb6_lock);
2016         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2017         if (!fn)
2018                 goto out;
2019         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2020                 if (rt->dst.dev->ifindex != dev->ifindex)
2021                         continue;
2022                 if ((rt->rt6i_flags & flags) != flags)
2023                         continue;
2024                 if ((rt->rt6i_flags & noflags) != 0)
2025                         continue;
2026                 dst_hold(&rt->dst);
2027                 break;
2028         }
2029 out:
2030         read_unlock_bh(&table->tb6_lock);
2031         return rt;
2032 }
2033
2034
2035 /* Create "default" multicast route to the interface */
2036
2037 static void addrconf_add_mroute(struct net_device *dev)
2038 {
2039         struct fib6_config cfg = {
2040                 .fc_table = RT6_TABLE_LOCAL,
2041                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2042                 .fc_ifindex = dev->ifindex,
2043                 .fc_dst_len = 8,
2044                 .fc_flags = RTF_UP,
2045                 .fc_nlinfo.nl_net = dev_net(dev),
2046         };
2047
2048         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2049
2050         ip6_route_add(&cfg);
2051 }
2052
2053 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2054 {
2055         struct inet6_dev *idev;
2056
2057         ASSERT_RTNL();
2058
2059         idev = ipv6_find_idev(dev);
2060         if (!idev)
2061                 return ERR_PTR(-ENOBUFS);
2062
2063         if (idev->cnf.disable_ipv6)
2064                 return ERR_PTR(-EACCES);
2065
2066         /* Add default multicast route */
2067         if (!(dev->flags & IFF_LOOPBACK))
2068                 addrconf_add_mroute(dev);
2069
2070         return idev;
2071 }
2072
2073 static void manage_tempaddrs(struct inet6_dev *idev,
2074                              struct inet6_ifaddr *ifp,
2075                              __u32 valid_lft, __u32 prefered_lft,
2076                              bool create, unsigned long now)
2077 {
2078         u32 flags;
2079         struct inet6_ifaddr *ift;
2080
2081         read_lock_bh(&idev->lock);
2082         /* update all temporary addresses in the list */
2083         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2084                 int age, max_valid, max_prefered;
2085
2086                 if (ifp != ift->ifpub)
2087                         continue;
2088
2089                 /* RFC 4941 section 3.3:
2090                  * If a received option will extend the lifetime of a public
2091                  * address, the lifetimes of temporary addresses should
2092                  * be extended, subject to the overall constraint that no
2093                  * temporary addresses should ever remain "valid" or "preferred"
2094                  * for a time longer than (TEMP_VALID_LIFETIME) or
2095                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2096                  */
2097                 age = (now - ift->cstamp) / HZ;
2098                 max_valid = idev->cnf.temp_valid_lft - age;
2099                 if (max_valid < 0)
2100                         max_valid = 0;
2101
2102                 max_prefered = idev->cnf.temp_prefered_lft -
2103                                idev->cnf.max_desync_factor - age;
2104                 if (max_prefered < 0)
2105                         max_prefered = 0;
2106
2107                 if (valid_lft > max_valid)
2108                         valid_lft = max_valid;
2109
2110                 if (prefered_lft > max_prefered)
2111                         prefered_lft = max_prefered;
2112
2113                 spin_lock(&ift->lock);
2114                 flags = ift->flags;
2115                 ift->valid_lft = valid_lft;
2116                 ift->prefered_lft = prefered_lft;
2117                 ift->tstamp = now;
2118                 if (prefered_lft > 0)
2119                         ift->flags &= ~IFA_F_DEPRECATED;
2120
2121                 spin_unlock(&ift->lock);
2122                 if (!(flags&IFA_F_TENTATIVE))
2123                         ipv6_ifa_notify(0, ift);
2124         }
2125
2126         if ((create || list_empty(&idev->tempaddr_list)) &&
2127             idev->cnf.use_tempaddr > 0) {
2128                 /* When a new public address is created as described
2129                  * in [ADDRCONF], also create a new temporary address.
2130                  * Also create a temporary address if it's enabled but
2131                  * no temporary address currently exists.
2132                  */
2133                 read_unlock_bh(&idev->lock);
2134                 ipv6_create_tempaddr(ifp, NULL);
2135         } else {
2136                 read_unlock_bh(&idev->lock);
2137         }
2138 }
2139
2140 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2141 {
2142         struct prefix_info *pinfo;
2143         __u32 valid_lft;
2144         __u32 prefered_lft;
2145         int addr_type;
2146         struct inet6_dev *in6_dev;
2147         struct net *net = dev_net(dev);
2148
2149         pinfo = (struct prefix_info *) opt;
2150
2151         if (len < sizeof(struct prefix_info)) {
2152                 ADBG("addrconf: prefix option too short\n");
2153                 return;
2154         }
2155
2156         /*
2157          *      Validation checks ([ADDRCONF], page 19)
2158          */
2159
2160         addr_type = ipv6_addr_type(&pinfo->prefix);
2161
2162         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2163                 return;
2164
2165         valid_lft = ntohl(pinfo->valid);
2166         prefered_lft = ntohl(pinfo->prefered);
2167
2168         if (prefered_lft > valid_lft) {
2169                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2170                 return;
2171         }
2172
2173         in6_dev = in6_dev_get(dev);
2174
2175         if (in6_dev == NULL) {
2176                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2177                                     dev->name);
2178                 return;
2179         }
2180
2181         /*
2182          *      Two things going on here:
2183          *      1) Add routes for on-link prefixes
2184          *      2) Configure prefixes with the auto flag set
2185          */
2186
2187         if (pinfo->onlink) {
2188                 struct rt6_info *rt;
2189                 unsigned long rt_expires;
2190
2191                 /* Avoid arithmetic overflow. Really, we could
2192                  * save rt_expires in seconds, likely valid_lft,
2193                  * but it would require division in fib gc, that it
2194                  * not good.
2195                  */
2196                 if (HZ > USER_HZ)
2197                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2198                 else
2199                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2200
2201                 if (addrconf_finite_timeout(rt_expires))
2202                         rt_expires *= HZ;
2203
2204                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2205                                                pinfo->prefix_len,
2206                                                dev,
2207                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2208                                                RTF_GATEWAY | RTF_DEFAULT);
2209
2210                 if (rt) {
2211                         /* Autoconf prefix route */
2212                         if (valid_lft == 0) {
2213                                 ip6_del_rt(rt);
2214                                 rt = NULL;
2215                         } else if (addrconf_finite_timeout(rt_expires)) {
2216                                 /* not infinity */
2217                                 rt6_set_expires(rt, jiffies + rt_expires);
2218                         } else {
2219                                 rt6_clean_expires(rt);
2220                         }
2221                 } else if (valid_lft) {
2222                         clock_t expires = 0;
2223                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2224                         if (addrconf_finite_timeout(rt_expires)) {
2225                                 /* not infinity */
2226                                 flags |= RTF_EXPIRES;
2227                                 expires = jiffies_to_clock_t(rt_expires);
2228                         }
2229                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2230                                               dev, expires, flags);
2231                 }
2232                 ip6_rt_put(rt);
2233         }
2234
2235         /* Try to figure out our local address for this prefix */
2236
2237         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2238                 struct inet6_ifaddr *ifp;
2239                 struct in6_addr addr;
2240                 int create = 0, update_lft = 0;
2241                 bool tokenized = false;
2242
2243                 if (pinfo->prefix_len == 64) {
2244                         memcpy(&addr, &pinfo->prefix, 8);
2245
2246                         if (!ipv6_addr_any(&in6_dev->token)) {
2247                                 read_lock_bh(&in6_dev->lock);
2248                                 memcpy(addr.s6_addr + 8,
2249                                        in6_dev->token.s6_addr + 8, 8);
2250                                 read_unlock_bh(&in6_dev->lock);
2251                                 tokenized = true;
2252                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2253                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2254                                 in6_dev_put(in6_dev);
2255                                 return;
2256                         }
2257                         goto ok;
2258                 }
2259                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2260                                     pinfo->prefix_len);
2261                 in6_dev_put(in6_dev);
2262                 return;
2263
2264 ok:
2265
2266                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2267
2268                 if (ifp == NULL && valid_lft) {
2269                         int max_addresses = in6_dev->cnf.max_addresses;
2270                         u32 addr_flags = 0;
2271
2272 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2273                         if (in6_dev->cnf.optimistic_dad &&
2274                             !net->ipv6.devconf_all->forwarding && sllao)
2275                                 addr_flags = IFA_F_OPTIMISTIC;
2276 #endif
2277
2278                         /* Do not allow to create too much of autoconfigured
2279                          * addresses; this would be too easy way to crash kernel.
2280                          */
2281                         if (!max_addresses ||
2282                             ipv6_count_addresses(in6_dev) < max_addresses)
2283                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2284                                                     pinfo->prefix_len,
2285                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2286                                                     addr_flags, valid_lft,
2287                                                     prefered_lft);
2288
2289                         if (IS_ERR_OR_NULL(ifp)) {
2290                                 in6_dev_put(in6_dev);
2291                                 return;
2292                         }
2293
2294                         update_lft = 0;
2295                         create = 1;
2296                         spin_lock_bh(&ifp->lock);
2297                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2298                         ifp->cstamp = jiffies;
2299                         ifp->tokenized = tokenized;
2300                         spin_unlock_bh(&ifp->lock);
2301                         addrconf_dad_start(ifp);
2302                 }
2303
2304                 if (ifp) {
2305                         u32 flags;
2306                         unsigned long now;
2307                         u32 stored_lft;
2308
2309                         /* update lifetime (RFC2462 5.5.3 e) */
2310                         spin_lock(&ifp->lock);
2311                         now = jiffies;
2312                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2313                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2314                         else
2315                                 stored_lft = 0;
2316                         if (!update_lft && !create && stored_lft) {
2317                                 const u32 minimum_lft = min(
2318                                         stored_lft, (u32)MIN_VALID_LIFETIME);
2319                                 valid_lft = max(valid_lft, minimum_lft);
2320
2321                                 /* RFC4862 Section 5.5.3e:
2322                                  * "Note that the preferred lifetime of the
2323                                  *  corresponding address is always reset to
2324                                  *  the Preferred Lifetime in the received
2325                                  *  Prefix Information option, regardless of
2326                                  *  whether the valid lifetime is also reset or
2327                                  *  ignored."
2328                                  *
2329                                  * So we should always update prefered_lft here.
2330                                  */
2331                                 update_lft = 1;
2332                         }
2333
2334                         if (update_lft) {
2335                                 ifp->valid_lft = valid_lft;
2336                                 ifp->prefered_lft = prefered_lft;
2337                                 ifp->tstamp = now;
2338                                 flags = ifp->flags;
2339                                 ifp->flags &= ~IFA_F_DEPRECATED;
2340                                 spin_unlock(&ifp->lock);
2341
2342                                 if (!(flags&IFA_F_TENTATIVE))
2343                                         ipv6_ifa_notify(0, ifp);
2344                         } else
2345                                 spin_unlock(&ifp->lock);
2346
2347                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2348                                          create, now);
2349
2350                         in6_ifa_put(ifp);
2351                         addrconf_verify();
2352                 }
2353         }
2354         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2355         in6_dev_put(in6_dev);
2356 }
2357
2358 /*
2359  *      Set destination address.
2360  *      Special case for SIT interfaces where we create a new "virtual"
2361  *      device.
2362  */
2363 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2364 {
2365         struct in6_ifreq ireq;
2366         struct net_device *dev;
2367         int err = -EINVAL;
2368
2369         rtnl_lock();
2370
2371         err = -EFAULT;
2372         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2373                 goto err_exit;
2374
2375         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2376
2377         err = -ENODEV;
2378         if (dev == NULL)
2379                 goto err_exit;
2380
2381 #if IS_ENABLED(CONFIG_IPV6_SIT)
2382         if (dev->type == ARPHRD_SIT) {
2383                 const struct net_device_ops *ops = dev->netdev_ops;
2384                 struct ifreq ifr;
2385                 struct ip_tunnel_parm p;
2386
2387                 err = -EADDRNOTAVAIL;
2388                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2389                         goto err_exit;
2390
2391                 memset(&p, 0, sizeof(p));
2392                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2393                 p.iph.saddr = 0;
2394                 p.iph.version = 4;
2395                 p.iph.ihl = 5;
2396                 p.iph.protocol = IPPROTO_IPV6;
2397                 p.iph.ttl = 64;
2398                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2399
2400                 if (ops->ndo_do_ioctl) {
2401                         mm_segment_t oldfs = get_fs();
2402
2403                         set_fs(KERNEL_DS);
2404                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2405                         set_fs(oldfs);
2406                 } else
2407                         err = -EOPNOTSUPP;
2408
2409                 if (err == 0) {
2410                         err = -ENOBUFS;
2411                         dev = __dev_get_by_name(net, p.name);
2412                         if (!dev)
2413                                 goto err_exit;
2414                         err = dev_open(dev);
2415                 }
2416         }
2417 #endif
2418
2419 err_exit:
2420         rtnl_unlock();
2421         return err;
2422 }
2423
2424 /*
2425  *      Manual configuration of address on an interface
2426  */
2427 static int inet6_addr_add(struct net *net, int ifindex,
2428                           const struct in6_addr *pfx,
2429                           const struct in6_addr *peer_pfx,
2430                           unsigned int plen, __u32 ifa_flags,
2431                           __u32 prefered_lft, __u32 valid_lft)
2432 {
2433         struct inet6_ifaddr *ifp;
2434         struct inet6_dev *idev;
2435         struct net_device *dev;
2436         int scope;
2437         u32 flags;
2438         clock_t expires;
2439         unsigned long timeout;
2440
2441         ASSERT_RTNL();
2442
2443         if (plen > 128)
2444                 return -EINVAL;
2445
2446         /* check the lifetime */
2447         if (!valid_lft || prefered_lft > valid_lft)
2448                 return -EINVAL;
2449
2450         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2451                 return -EINVAL;
2452
2453         dev = __dev_get_by_index(net, ifindex);
2454         if (!dev)
2455                 return -ENODEV;
2456
2457         idev = addrconf_add_dev(dev);
2458         if (IS_ERR(idev))
2459                 return PTR_ERR(idev);
2460
2461         scope = ipv6_addr_scope(pfx);
2462
2463         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2464         if (addrconf_finite_timeout(timeout)) {
2465                 expires = jiffies_to_clock_t(timeout * HZ);
2466                 valid_lft = timeout;
2467                 flags = RTF_EXPIRES;
2468         } else {
2469                 expires = 0;
2470                 flags = 0;
2471                 ifa_flags |= IFA_F_PERMANENT;
2472         }
2473
2474         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2475         if (addrconf_finite_timeout(timeout)) {
2476                 if (timeout == 0)
2477                         ifa_flags |= IFA_F_DEPRECATED;
2478                 prefered_lft = timeout;
2479         }
2480
2481         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2482                             valid_lft, prefered_lft);
2483
2484         if (!IS_ERR(ifp)) {
2485                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2486                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2487                                               expires, flags);
2488                 }
2489
2490                 /*
2491                  * Note that section 3.1 of RFC 4429 indicates
2492                  * that the Optimistic flag should not be set for
2493                  * manually configured addresses
2494                  */
2495                 addrconf_dad_start(ifp);
2496                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2497                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2498                                          true, jiffies);
2499                 in6_ifa_put(ifp);
2500                 addrconf_verify_rtnl();
2501                 return 0;
2502         }
2503
2504         return PTR_ERR(ifp);
2505 }
2506
2507 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2508                           unsigned int plen)
2509 {
2510         struct inet6_ifaddr *ifp;
2511         struct inet6_dev *idev;
2512         struct net_device *dev;
2513
2514         if (plen > 128)
2515                 return -EINVAL;
2516
2517         dev = __dev_get_by_index(net, ifindex);
2518         if (!dev)
2519                 return -ENODEV;
2520
2521         if ((idev = __in6_dev_get(dev)) == NULL)
2522                 return -ENXIO;
2523
2524         read_lock_bh(&idev->lock);
2525         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2526                 if (ifp->prefix_len == plen &&
2527                     ipv6_addr_equal(pfx, &ifp->addr)) {
2528                         in6_ifa_hold(ifp);
2529                         read_unlock_bh(&idev->lock);
2530
2531                         ipv6_del_addr(ifp);
2532                         return 0;
2533                 }
2534         }
2535         read_unlock_bh(&idev->lock);
2536         return -EADDRNOTAVAIL;
2537 }
2538
2539
2540 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2541 {
2542         struct in6_ifreq ireq;
2543         int err;
2544
2545         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2546                 return -EPERM;
2547
2548         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2549                 return -EFAULT;
2550
2551         rtnl_lock();
2552         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2553                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2554                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2555         rtnl_unlock();
2556         return err;
2557 }
2558
2559 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2560 {
2561         struct in6_ifreq ireq;
2562         int err;
2563
2564         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2565                 return -EPERM;
2566
2567         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2568                 return -EFAULT;
2569
2570         rtnl_lock();
2571         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2572                              ireq.ifr6_prefixlen);
2573         rtnl_unlock();
2574         return err;
2575 }
2576
2577 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2578                      int plen, int scope)
2579 {
2580         struct inet6_ifaddr *ifp;
2581
2582         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2583                             scope, IFA_F_PERMANENT,
2584                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2585         if (!IS_ERR(ifp)) {
2586                 spin_lock_bh(&ifp->lock);
2587                 ifp->flags &= ~IFA_F_TENTATIVE;
2588                 spin_unlock_bh(&ifp->lock);
2589                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2590                 in6_ifa_put(ifp);
2591         }
2592 }
2593
2594 #if IS_ENABLED(CONFIG_IPV6_SIT)
2595 static void sit_add_v4_addrs(struct inet6_dev *idev)
2596 {
2597         struct in6_addr addr;
2598         struct net_device *dev;
2599         struct net *net = dev_net(idev->dev);
2600         int scope, plen;
2601         u32 pflags = 0;
2602
2603         ASSERT_RTNL();
2604
2605         memset(&addr, 0, sizeof(struct in6_addr));
2606         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2607
2608         if (idev->dev->flags&IFF_POINTOPOINT) {
2609                 addr.s6_addr32[0] = htonl(0xfe800000);
2610                 scope = IFA_LINK;
2611                 plen = 64;
2612         } else {
2613                 scope = IPV6_ADDR_COMPATv4;
2614                 plen = 96;
2615                 pflags |= RTF_NONEXTHOP;
2616         }
2617
2618         if (addr.s6_addr32[3]) {
2619                 add_addr(idev, &addr, plen, scope);
2620                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2621                 return;
2622         }
2623
2624         for_each_netdev(net, dev) {
2625                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2626                 if (in_dev && (dev->flags & IFF_UP)) {
2627                         struct in_ifaddr *ifa;
2628
2629                         int flag = scope;
2630
2631                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2632
2633                                 addr.s6_addr32[3] = ifa->ifa_local;
2634
2635                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2636                                         continue;
2637                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2638                                         if (idev->dev->flags&IFF_POINTOPOINT)
2639                                                 continue;
2640                                         flag |= IFA_HOST;
2641                                 }
2642
2643                                 add_addr(idev, &addr, plen, flag);
2644                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2645                                                       pflags);
2646                         }
2647                 }
2648         }
2649 }
2650 #endif
2651
2652 static void init_loopback(struct net_device *dev)
2653 {
2654         struct inet6_dev  *idev;
2655         struct net_device *sp_dev;
2656         struct inet6_ifaddr *sp_ifa;
2657         struct rt6_info *sp_rt;
2658
2659         /* ::1 */
2660
2661         ASSERT_RTNL();
2662
2663         if ((idev = ipv6_find_idev(dev)) == NULL) {
2664                 pr_debug("%s: add_dev failed\n", __func__);
2665                 return;
2666         }
2667
2668         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2669
2670         /* Add routes to other interface's IPv6 addresses */
2671         for_each_netdev(dev_net(dev), sp_dev) {
2672                 if (!strcmp(sp_dev->name, dev->name))
2673                         continue;
2674
2675                 idev = __in6_dev_get(sp_dev);
2676                 if (!idev)
2677                         continue;
2678
2679                 read_lock_bh(&idev->lock);
2680                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2681
2682                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2683                                 continue;
2684
2685                         if (sp_ifa->rt) {
2686                                 /* This dst has been added to garbage list when
2687                                  * lo device down, release this obsolete dst and
2688                                  * reallocate a new router for ifa.
2689                                  */
2690                                 if (sp_ifa->rt->dst.obsolete > 0) {
2691                                         ip6_rt_put(sp_ifa->rt);
2692                                         sp_ifa->rt = NULL;
2693                                 } else {
2694                                         continue;
2695                                 }
2696                         }
2697
2698                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2699
2700                         /* Failure cases are ignored */
2701                         if (!IS_ERR(sp_rt)) {
2702                                 sp_ifa->rt = sp_rt;
2703                                 ip6_ins_rt(sp_rt);
2704                         }
2705                 }
2706                 read_unlock_bh(&idev->lock);
2707         }
2708 }
2709
2710 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2711 {
2712         struct inet6_ifaddr *ifp;
2713         u32 addr_flags = IFA_F_PERMANENT;
2714
2715 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2716         if (idev->cnf.optimistic_dad &&
2717             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2718                 addr_flags |= IFA_F_OPTIMISTIC;
2719 #endif
2720
2721
2722         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2723                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2724         if (!IS_ERR(ifp)) {
2725                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2726                 addrconf_dad_start(ifp);
2727                 in6_ifa_put(ifp);
2728         }
2729 }
2730
2731 static void addrconf_dev_config(struct net_device *dev)
2732 {
2733         struct in6_addr addr;
2734         struct inet6_dev *idev;
2735
2736         ASSERT_RTNL();
2737
2738         if ((dev->type != ARPHRD_ETHER) &&
2739             (dev->type != ARPHRD_FDDI) &&
2740             (dev->type != ARPHRD_ARCNET) &&
2741             (dev->type != ARPHRD_INFINIBAND) &&
2742             (dev->type != ARPHRD_IEEE802154) &&
2743             (dev->type != ARPHRD_IEEE1394) &&
2744             (dev->type != ARPHRD_TUNNEL6) &&
2745             (dev->type != ARPHRD_6LOWPAN)) {
2746                 /* Alas, we support only Ethernet autoconfiguration. */
2747                 return;
2748         }
2749
2750         idev = addrconf_add_dev(dev);
2751         if (IS_ERR(idev))
2752                 return;
2753
2754         memset(&addr, 0, sizeof(struct in6_addr));
2755         addr.s6_addr32[0] = htonl(0xFE800000);
2756
2757         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2758                 addrconf_add_linklocal(idev, &addr);
2759 }
2760
2761 #if IS_ENABLED(CONFIG_IPV6_SIT)
2762 static void addrconf_sit_config(struct net_device *dev)
2763 {
2764         struct inet6_dev *idev;
2765
2766         ASSERT_RTNL();
2767
2768         /*
2769          * Configure the tunnel with one of our IPv4
2770          * addresses... we should configure all of
2771          * our v4 addrs in the tunnel
2772          */
2773
2774         if ((idev = ipv6_find_idev(dev)) == NULL) {
2775                 pr_debug("%s: add_dev failed\n", __func__);
2776                 return;
2777         }
2778
2779         if (dev->priv_flags & IFF_ISATAP) {
2780                 struct in6_addr addr;
2781
2782                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2783                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2784                         addrconf_add_linklocal(idev, &addr);
2785                 return;
2786         }
2787
2788         sit_add_v4_addrs(idev);
2789
2790         if (dev->flags&IFF_POINTOPOINT)
2791                 addrconf_add_mroute(dev);
2792 }
2793 #endif
2794
2795 #if IS_ENABLED(CONFIG_NET_IPGRE)
2796 static void addrconf_gre_config(struct net_device *dev)
2797 {
2798         struct inet6_dev *idev;
2799         struct in6_addr addr;
2800
2801         ASSERT_RTNL();
2802
2803         if ((idev = ipv6_find_idev(dev)) == NULL) {
2804                 pr_debug("%s: add_dev failed\n", __func__);
2805                 return;
2806         }
2807
2808         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2809         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2810                 addrconf_add_linklocal(idev, &addr);
2811         else
2812                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2813 }
2814 #endif
2815
2816 static inline int
2817 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2818 {
2819         struct in6_addr lladdr;
2820
2821         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2822                 addrconf_add_linklocal(idev, &lladdr);
2823                 return 0;
2824         }
2825         return -1;
2826 }
2827
2828 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2829                            void *ptr)
2830 {
2831         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2832         struct inet6_dev *idev = __in6_dev_get(dev);
2833         int run_pending = 0;
2834         int err;
2835
2836         switch (event) {
2837         case NETDEV_REGISTER:
2838                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2839                         idev = ipv6_add_dev(dev);
2840                         if (!idev)
2841                                 return notifier_from_errno(-ENOMEM);
2842                 }
2843                 break;
2844
2845         case NETDEV_UP:
2846         case NETDEV_CHANGE:
2847                 if (dev->flags & IFF_SLAVE)
2848                         break;
2849
2850                 if (event == NETDEV_UP) {
2851                         if (!addrconf_qdisc_ok(dev)) {
2852                                 /* device is not ready yet. */
2853                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2854                                         dev->name);
2855                                 break;
2856                         }
2857
2858                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2859                                 idev = ipv6_add_dev(dev);
2860
2861                         if (idev) {
2862                                 idev->if_flags |= IF_READY;
2863                                 run_pending = 1;
2864                         }
2865                 } else {
2866                         if (!addrconf_qdisc_ok(dev)) {
2867                                 /* device is still not ready. */
2868                                 break;
2869                         }
2870
2871                         if (idev) {
2872                                 if (idev->if_flags & IF_READY)
2873                                         /* device is already configured. */
2874                                         break;
2875                                 idev->if_flags |= IF_READY;
2876                         }
2877
2878                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2879                                 dev->name);
2880
2881                         run_pending = 1;
2882                 }
2883
2884                 switch (dev->type) {
2885 #if IS_ENABLED(CONFIG_IPV6_SIT)
2886                 case ARPHRD_SIT:
2887                         addrconf_sit_config(dev);
2888                         break;
2889 #endif
2890 #if IS_ENABLED(CONFIG_NET_IPGRE)
2891                 case ARPHRD_IPGRE:
2892                         addrconf_gre_config(dev);
2893                         break;
2894 #endif
2895                 case ARPHRD_LOOPBACK:
2896                         init_loopback(dev);
2897                         break;
2898
2899                 default:
2900                         addrconf_dev_config(dev);
2901                         break;
2902                 }
2903
2904                 if (idev) {
2905                         if (run_pending)
2906                                 addrconf_dad_run(idev);
2907
2908                         /*
2909                          * If the MTU changed during the interface down,
2910                          * when the interface up, the changed MTU must be
2911                          * reflected in the idev as well as routers.
2912                          */
2913                         if (idev->cnf.mtu6 != dev->mtu &&
2914                             dev->mtu >= IPV6_MIN_MTU) {
2915                                 rt6_mtu_change(dev, dev->mtu);
2916                                 idev->cnf.mtu6 = dev->mtu;
2917                         }
2918                         idev->tstamp = jiffies;
2919                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2920
2921                         /*
2922                          * If the changed mtu during down is lower than
2923                          * IPV6_MIN_MTU stop IPv6 on this interface.
2924                          */
2925                         if (dev->mtu < IPV6_MIN_MTU)
2926                                 addrconf_ifdown(dev, 1);
2927                 }
2928                 break;
2929
2930         case NETDEV_CHANGEMTU:
2931                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2932                         rt6_mtu_change(dev, dev->mtu);
2933                         idev->cnf.mtu6 = dev->mtu;
2934                         break;
2935                 }
2936
2937                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2938                         idev = ipv6_add_dev(dev);
2939                         if (idev)
2940                                 break;
2941                 }
2942
2943                 /*
2944                  * if MTU under IPV6_MIN_MTU.
2945                  * Stop IPv6 on this interface.
2946                  */
2947
2948         case NETDEV_DOWN:
2949         case NETDEV_UNREGISTER:
2950                 /*
2951                  *      Remove all addresses from this interface.
2952                  */
2953                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2954                 break;
2955
2956         case NETDEV_CHANGENAME:
2957                 if (idev) {
2958                         snmp6_unregister_dev(idev);
2959                         addrconf_sysctl_unregister(idev);
2960                         addrconf_sysctl_register(idev);
2961                         err = snmp6_register_dev(idev);
2962                         if (err)
2963                                 return notifier_from_errno(err);
2964                 }
2965                 break;
2966
2967         case NETDEV_PRE_TYPE_CHANGE:
2968         case NETDEV_POST_TYPE_CHANGE:
2969                 addrconf_type_change(dev, event);
2970                 break;
2971         }
2972
2973         return NOTIFY_OK;
2974 }
2975
2976 /*
2977  *      addrconf module should be notified of a device going up
2978  */
2979 static struct notifier_block ipv6_dev_notf = {
2980         .notifier_call = addrconf_notify,
2981 };
2982
2983 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2984 {
2985         struct inet6_dev *idev;
2986         ASSERT_RTNL();
2987
2988         idev = __in6_dev_get(dev);
2989
2990         if (event == NETDEV_POST_TYPE_CHANGE)
2991                 ipv6_mc_remap(idev);
2992         else if (event == NETDEV_PRE_TYPE_CHANGE)
2993                 ipv6_mc_unmap(idev);
2994 }
2995
2996 static int addrconf_ifdown(struct net_device *dev, int how)
2997 {
2998         struct net *net = dev_net(dev);
2999         struct inet6_dev *idev;
3000         struct inet6_ifaddr *ifa;
3001         int state, i;
3002
3003         ASSERT_RTNL();
3004
3005         rt6_ifdown(net, dev);
3006         neigh_ifdown(&nd_tbl, dev);
3007
3008         idev = __in6_dev_get(dev);
3009         if (idev == NULL)
3010                 return -ENODEV;
3011
3012         /*
3013          * Step 1: remove reference to ipv6 device from parent device.
3014          *         Do not dev_put!
3015          */
3016         if (how) {
3017                 idev->dead = 1;
3018
3019                 /* protected by rtnl_lock */
3020                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3021
3022                 /* Step 1.5: remove snmp6 entry */
3023                 snmp6_unregister_dev(idev);
3024
3025         }
3026
3027         /* Step 2: clear hash table */
3028         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3029                 struct hlist_head *h = &inet6_addr_lst[i];
3030
3031                 spin_lock_bh(&addrconf_hash_lock);
3032         restart:
3033                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3034                         if (ifa->idev == idev) {
3035                                 hlist_del_init_rcu(&ifa->addr_lst);
3036                                 addrconf_del_dad_work(ifa);
3037                                 goto restart;
3038                         }
3039                 }
3040                 spin_unlock_bh(&addrconf_hash_lock);
3041         }
3042
3043         write_lock_bh(&idev->lock);
3044
3045         addrconf_del_rs_timer(idev);
3046
3047         /* Step 2: clear flags for stateless addrconf */
3048         if (!how)
3049                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3050
3051         if (how && del_timer(&idev->regen_timer))
3052                 in6_dev_put(idev);
3053
3054         /* Step 3: clear tempaddr list */
3055         while (!list_empty(&idev->tempaddr_list)) {
3056                 ifa = list_first_entry(&idev->tempaddr_list,
3057                                        struct inet6_ifaddr, tmp_list);
3058                 list_del(&ifa->tmp_list);
3059                 write_unlock_bh(&idev->lock);
3060                 spin_lock_bh(&ifa->lock);
3061
3062                 if (ifa->ifpub) {
3063                         in6_ifa_put(ifa->ifpub);
3064                         ifa->ifpub = NULL;
3065                 }
3066                 spin_unlock_bh(&ifa->lock);
3067                 in6_ifa_put(ifa);
3068                 write_lock_bh(&idev->lock);
3069         }
3070
3071         while (!list_empty(&idev->addr_list)) {
3072                 ifa = list_first_entry(&idev->addr_list,
3073                                        struct inet6_ifaddr, if_list);
3074                 addrconf_del_dad_work(ifa);
3075
3076                 list_del(&ifa->if_list);
3077
3078                 write_unlock_bh(&idev->lock);
3079
3080                 spin_lock_bh(&ifa->state_lock);
3081                 state = ifa->state;
3082                 ifa->state = INET6_IFADDR_STATE_DEAD;
3083                 spin_unlock_bh(&ifa->state_lock);
3084
3085                 if (state != INET6_IFADDR_STATE_DEAD) {
3086                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3087                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3088                 }
3089                 in6_ifa_put(ifa);
3090
3091                 write_lock_bh(&idev->lock);
3092         }
3093
3094         write_unlock_bh(&idev->lock);
3095
3096         /* Step 5: Discard multicast list */
3097         if (how)
3098                 ipv6_mc_destroy_dev(idev);
3099         else
3100                 ipv6_mc_down(idev);
3101
3102         idev->tstamp = jiffies;
3103
3104         /* Last: Shot the device (if unregistered) */
3105         if (how) {
3106                 addrconf_sysctl_unregister(idev);
3107                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3108                 neigh_ifdown(&nd_tbl, dev);
3109                 in6_dev_put(idev);
3110         }
3111         return 0;
3112 }
3113
3114 static void addrconf_rs_timer(unsigned long data)
3115 {
3116         struct inet6_dev *idev = (struct inet6_dev *)data;
3117         struct net_device *dev = idev->dev;
3118         struct in6_addr lladdr;
3119
3120         write_lock(&idev->lock);
3121         if (idev->dead || !(idev->if_flags & IF_READY))
3122                 goto out;
3123
3124         if (!ipv6_accept_ra(idev))
3125                 goto out;
3126
3127         /* Announcement received after solicitation was sent */
3128         if (idev->if_flags & IF_RA_RCVD)
3129                 goto out;
3130
3131         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3132                 write_unlock(&idev->lock);
3133                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3134                         ndisc_send_rs(dev, &lladdr,
3135                                       &in6addr_linklocal_allrouters);
3136                 else
3137                         goto put;
3138
3139                 write_lock(&idev->lock);
3140                 /* The wait after the last probe can be shorter */
3141                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3142                                              idev->cnf.rtr_solicits) ?
3143                                       idev->cnf.rtr_solicit_delay :
3144                                       idev->cnf.rtr_solicit_interval);
3145         } else {
3146                 /*
3147                  * Note: we do not support deprecated "all on-link"
3148                  * assumption any longer.
3149                  */
3150                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3151         }
3152
3153 out:
3154         write_unlock(&idev->lock);
3155 put:
3156         in6_dev_put(idev);
3157 }
3158
3159 /*
3160  *      Duplicate Address Detection
3161  */
3162 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3163 {
3164         unsigned long rand_num;
3165         struct inet6_dev *idev = ifp->idev;
3166
3167         if (ifp->flags & IFA_F_OPTIMISTIC)
3168                 rand_num = 0;
3169         else
3170                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3171
3172         ifp->dad_probes = idev->cnf.dad_transmits;
3173         addrconf_mod_dad_work(ifp, rand_num);
3174 }
3175
3176 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3177 {
3178         struct inet6_dev *idev = ifp->idev;
3179         struct net_device *dev = idev->dev;
3180
3181         addrconf_join_solict(dev, &ifp->addr);
3182
3183         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3184
3185         read_lock_bh(&idev->lock);
3186         spin_lock(&ifp->lock);
3187         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3188                 goto out;
3189
3190         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3191             idev->cnf.accept_dad < 1 ||
3192             !(ifp->flags&IFA_F_TENTATIVE) ||
3193             ifp->flags & IFA_F_NODAD) {
3194                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3195                 spin_unlock(&ifp->lock);
3196                 read_unlock_bh(&idev->lock);
3197
3198                 addrconf_dad_completed(ifp);
3199                 return;
3200         }
3201
3202         if (!(idev->if_flags & IF_READY)) {
3203                 spin_unlock(&ifp->lock);
3204                 read_unlock_bh(&idev->lock);
3205                 /*
3206                  * If the device is not ready:
3207                  * - keep it tentative if it is a permanent address.
3208                  * - otherwise, kill it.
3209                  */
3210                 in6_ifa_hold(ifp);
3211                 addrconf_dad_stop(ifp, 0);
3212                 return;
3213         }
3214
3215         /*
3216          * Optimistic nodes can start receiving
3217          * Frames right away
3218          */
3219         if (ifp->flags & IFA_F_OPTIMISTIC)
3220                 ip6_ins_rt(ifp->rt);
3221
3222         addrconf_dad_kick(ifp);
3223 out:
3224         spin_unlock(&ifp->lock);
3225         read_unlock_bh(&idev->lock);
3226 }
3227
3228 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3229 {
3230         bool begin_dad = false;
3231
3232         spin_lock_bh(&ifp->state_lock);
3233         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3234                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3235                 begin_dad = true;
3236         }
3237         spin_unlock_bh(&ifp->state_lock);
3238
3239         if (begin_dad)
3240                 addrconf_mod_dad_work(ifp, 0);
3241 }
3242
3243 static void addrconf_dad_work(struct work_struct *w)
3244 {
3245         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3246                                                 struct inet6_ifaddr,
3247                                                 dad_work);
3248         struct inet6_dev *idev = ifp->idev;
3249         struct in6_addr mcaddr;
3250
3251         enum {
3252                 DAD_PROCESS,
3253                 DAD_BEGIN,
3254                 DAD_ABORT,
3255         } action = DAD_PROCESS;
3256
3257         rtnl_lock();
3258
3259         spin_lock_bh(&ifp->state_lock);
3260         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3261                 action = DAD_BEGIN;
3262                 ifp->state = INET6_IFADDR_STATE_DAD;
3263         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3264                 action = DAD_ABORT;
3265                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3266         }
3267         spin_unlock_bh(&ifp->state_lock);
3268
3269         if (action == DAD_BEGIN) {
3270                 addrconf_dad_begin(ifp);
3271                 goto out;
3272         } else if (action == DAD_ABORT) {
3273                 addrconf_dad_stop(ifp, 1);
3274                 goto out;
3275         }
3276
3277         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3278                 goto out;
3279
3280         write_lock_bh(&idev->lock);
3281         if (idev->dead || !(idev->if_flags & IF_READY)) {
3282                 write_unlock_bh(&idev->lock);
3283                 goto out;
3284         }
3285
3286         spin_lock(&ifp->lock);
3287         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3288                 spin_unlock(&ifp->lock);
3289                 write_unlock_bh(&idev->lock);
3290                 goto out;
3291         }
3292
3293         if (ifp->dad_probes == 0) {
3294                 /*
3295                  * DAD was successful
3296                  */
3297
3298                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3299                 spin_unlock(&ifp->lock);
3300                 write_unlock_bh(&idev->lock);
3301
3302                 addrconf_dad_completed(ifp);
3303
3304                 goto out;
3305         }
3306
3307         ifp->dad_probes--;
3308         addrconf_mod_dad_work(ifp,
3309                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3310         spin_unlock(&ifp->lock);
3311         write_unlock_bh(&idev->lock);
3312
3313         /* send a neighbour solicitation for our addr */
3314         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3315         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3316 out:
3317         in6_ifa_put(ifp);
3318         rtnl_unlock();
3319 }
3320
3321 /* ifp->idev must be at least read locked */
3322 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3323 {
3324         struct inet6_ifaddr *ifpiter;
3325         struct inet6_dev *idev = ifp->idev;
3326
3327         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3328                 if (ifpiter->scope > IFA_LINK)
3329                         break;
3330                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3331                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3332                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3333                     IFA_F_PERMANENT)
3334                         return false;
3335         }
3336         return true;
3337 }
3338
3339 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3340 {
3341         struct net_device *dev = ifp->idev->dev;
3342         struct in6_addr lladdr;
3343         bool send_rs, send_mld;
3344
3345         addrconf_del_dad_work(ifp);
3346
3347         /*
3348          *      Configure the address for reception. Now it is valid.
3349          */
3350
3351         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3352
3353         /* If added prefix is link local and we are prepared to process
3354            router advertisements, start sending router solicitations.
3355          */
3356
3357         read_lock_bh(&ifp->idev->lock);
3358         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3359         send_rs = send_mld &&
3360                   ipv6_accept_ra(ifp->idev) &&
3361                   ifp->idev->cnf.rtr_solicits > 0 &&
3362                   (dev->flags&IFF_LOOPBACK) == 0;
3363         read_unlock_bh(&ifp->idev->lock);
3364
3365         /* While dad is in progress mld report's source address is in6_addrany.
3366          * Resend with proper ll now.
3367          */
3368         if (send_mld)
3369                 ipv6_mc_dad_complete(ifp->idev);
3370
3371         if (send_rs) {
3372                 /*
3373                  *      If a host as already performed a random delay
3374                  *      [...] as part of DAD [...] there is no need
3375                  *      to delay again before sending the first RS
3376                  */
3377                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3378                         return;
3379                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3380
3381                 write_lock_bh(&ifp->idev->lock);
3382                 spin_lock(&ifp->lock);
3383                 ifp->idev->rs_probes = 1;
3384                 ifp->idev->if_flags |= IF_RS_SENT;
3385                 addrconf_mod_rs_timer(ifp->idev,
3386                                       ifp->idev->cnf.rtr_solicit_interval);
3387                 spin_unlock(&ifp->lock);
3388                 write_unlock_bh(&ifp->idev->lock);
3389         }
3390 }
3391
3392 static void addrconf_dad_run(struct inet6_dev *idev)
3393 {
3394         struct inet6_ifaddr *ifp;
3395
3396         read_lock_bh(&idev->lock);
3397         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3398                 spin_lock(&ifp->lock);
3399                 if (ifp->flags & IFA_F_TENTATIVE &&
3400                     ifp->state == INET6_IFADDR_STATE_DAD)
3401                         addrconf_dad_kick(ifp);
3402                 spin_unlock(&ifp->lock);
3403         }
3404         read_unlock_bh(&idev->lock);
3405 }
3406
3407 #ifdef CONFIG_PROC_FS
3408 struct if6_iter_state {
3409         struct seq_net_private p;
3410         int bucket;
3411         int offset;
3412 };
3413
3414 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3415 {
3416         struct inet6_ifaddr *ifa = NULL;
3417         struct if6_iter_state *state = seq->private;
3418         struct net *net = seq_file_net(seq);
3419         int p = 0;
3420
3421         /* initial bucket if pos is 0 */
3422         if (pos == 0) {
3423                 state->bucket = 0;
3424                 state->offset = 0;
3425         }
3426
3427         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3428                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3429                                          addr_lst) {
3430                         if (!net_eq(dev_net(ifa->idev->dev), net))
3431                                 continue;
3432                         /* sync with offset */
3433                         if (p < state->offset) {
3434                                 p++;
3435                                 continue;
3436                         }
3437                         state->offset++;
3438                         return ifa;
3439                 }
3440
3441                 /* prepare for next bucket */
3442                 state->offset = 0;
3443                 p = 0;
3444         }
3445         return NULL;
3446 }
3447
3448 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3449                                          struct inet6_ifaddr *ifa)
3450 {
3451         struct if6_iter_state *state = seq->private;
3452         struct net *net = seq_file_net(seq);
3453
3454         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3455                 if (!net_eq(dev_net(ifa->idev->dev), net))
3456                         continue;
3457                 state->offset++;
3458                 return ifa;
3459         }
3460
3461         while (++state->bucket < IN6_ADDR_HSIZE) {
3462                 state->offset = 0;
3463                 hlist_for_each_entry_rcu_bh(ifa,
3464                                      &inet6_addr_lst[state->bucket], addr_lst) {
3465                         if (!net_eq(dev_net(ifa->idev->dev), net))
3466                                 continue;
3467                         state->offset++;
3468                         return ifa;
3469                 }
3470         }
3471
3472         return NULL;
3473 }
3474
3475 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3476         __acquires(rcu_bh)
3477 {
3478         rcu_read_lock_bh();
3479         return if6_get_first(seq, *pos);
3480 }
3481
3482 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3483 {
3484         struct inet6_ifaddr *ifa;
3485
3486         ifa = if6_get_next(seq, v);
3487         ++*pos;
3488         return ifa;
3489 }
3490
3491 static void if6_seq_stop(struct seq_file *seq, void *v)
3492         __releases(rcu_bh)
3493 {
3494         rcu_read_unlock_bh();
3495 }
3496
3497 static int if6_seq_show(struct seq_file *seq, void *v)
3498 {
3499         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3500         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3501                    &ifp->addr,
3502                    ifp->idev->dev->ifindex,
3503                    ifp->prefix_len,
3504                    ifp->scope,
3505                    (u8) ifp->flags,
3506                    ifp->idev->dev->name);
3507         return 0;
3508 }
3509
3510 static const struct seq_operations if6_seq_ops = {
3511         .start  = if6_seq_start,
3512         .next   = if6_seq_next,
3513         .show   = if6_seq_show,
3514         .stop   = if6_seq_stop,
3515 };
3516
3517 static int if6_seq_open(struct inode *inode, struct file *file)
3518 {
3519         return seq_open_net(inode, file, &if6_seq_ops,
3520                             sizeof(struct if6_iter_state));
3521 }
3522
3523 static const struct file_operations if6_fops = {
3524         .owner          = THIS_MODULE,
3525         .open           = if6_seq_open,
3526         .read           = seq_read,
3527         .llseek         = seq_lseek,
3528         .release        = seq_release_net,
3529 };
3530
3531 static int __net_init if6_proc_net_init(struct net *net)
3532 {
3533         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3534                 return -ENOMEM;
3535         return 0;
3536 }
3537
3538 static void __net_exit if6_proc_net_exit(struct net *net)
3539 {
3540         remove_proc_entry("if_inet6", net->proc_net);
3541 }
3542
3543 static struct pernet_operations if6_proc_net_ops = {
3544        .init = if6_proc_net_init,
3545        .exit = if6_proc_net_exit,
3546 };
3547
3548 int __init if6_proc_init(void)
3549 {
3550         return register_pernet_subsys(&if6_proc_net_ops);
3551 }
3552
3553 void if6_proc_exit(void)
3554 {
3555         unregister_pernet_subsys(&if6_proc_net_ops);
3556 }
3557 #endif  /* CONFIG_PROC_FS */
3558
3559 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3560 /* Check if address is a home address configured on any interface. */
3561 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3562 {
3563         int ret = 0;
3564         struct inet6_ifaddr *ifp = NULL;
3565         unsigned int hash = inet6_addr_hash(addr);
3566
3567         rcu_read_lock_bh();
3568         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3569                 if (!net_eq(dev_net(ifp->idev->dev), net))
3570                         continue;
3571                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3572                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3573                         ret = 1;
3574                         break;
3575                 }
3576         }
3577         rcu_read_unlock_bh();
3578         return ret;
3579 }
3580 #endif
3581
3582 /*
3583  *      Periodic address status verification
3584  */
3585
3586 static void addrconf_verify_rtnl(void)
3587 {
3588         unsigned long now, next, next_sec, next_sched;
3589         struct inet6_ifaddr *ifp;
3590         int i;
3591
3592         ASSERT_RTNL();
3593
3594         rcu_read_lock_bh();
3595         now = jiffies;
3596         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3597
3598         cancel_delayed_work(&addr_chk_work);
3599
3600         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3601 restart:
3602                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3603                         unsigned long age;
3604
3605                         /* When setting preferred_lft to a value not zero or
3606                          * infinity, while valid_lft is infinity
3607                          * IFA_F_PERMANENT has a non-infinity life time.
3608                          */
3609                         if ((ifp->flags & IFA_F_PERMANENT) &&
3610                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
3611                                 continue;
3612
3613                         spin_lock(&ifp->lock);
3614                         /* We try to batch several events at once. */
3615                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3616
3617                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3618                             age >= ifp->valid_lft) {
3619                                 spin_unlock(&ifp->lock);
3620                                 in6_ifa_hold(ifp);
3621                                 ipv6_del_addr(ifp);
3622                                 goto restart;
3623                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3624                                 spin_unlock(&ifp->lock);
3625                                 continue;
3626                         } else if (age >= ifp->prefered_lft) {
3627                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3628                                 int deprecate = 0;
3629
3630                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3631                                         deprecate = 1;
3632                                         ifp->flags |= IFA_F_DEPRECATED;
3633                                 }
3634
3635                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3636                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3637                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3638
3639                                 spin_unlock(&ifp->lock);
3640
3641                                 if (deprecate) {
3642                                         in6_ifa_hold(ifp);
3643
3644                                         ipv6_ifa_notify(0, ifp);
3645                                         in6_ifa_put(ifp);
3646                                         goto restart;
3647                                 }
3648                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3649                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3650                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3651                                         ifp->idev->cnf.dad_transmits *
3652                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3653
3654                                 if (age >= ifp->prefered_lft - regen_advance) {
3655                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3656                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3657                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3658                                         if (!ifp->regen_count && ifpub) {
3659                                                 ifp->regen_count++;
3660                                                 in6_ifa_hold(ifp);
3661                                                 in6_ifa_hold(ifpub);
3662                                                 spin_unlock(&ifp->lock);
3663
3664                                                 spin_lock(&ifpub->lock);
3665                                                 ifpub->regen_count = 0;
3666                                                 spin_unlock(&ifpub->lock);
3667                                                 ipv6_create_tempaddr(ifpub, ifp);
3668                                                 in6_ifa_put(ifpub);
3669                                                 in6_ifa_put(ifp);
3670                                                 goto restart;
3671                                         }
3672                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3673                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3674                                 spin_unlock(&ifp->lock);
3675                         } else {
3676                                 /* ifp->prefered_lft <= ifp->valid_lft */
3677                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3678                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3679                                 spin_unlock(&ifp->lock);
3680                         }
3681                 }
3682         }
3683
3684         next_sec = round_jiffies_up(next);
3685         next_sched = next;
3686
3687         /* If rounded timeout is accurate enough, accept it. */
3688         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3689                 next_sched = next_sec;
3690
3691         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3692         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3693                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3694
3695         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3696               now, next, next_sec, next_sched);
3697         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3698         rcu_read_unlock_bh();
3699 }
3700
3701 static void addrconf_verify_work(struct work_struct *w)
3702 {
3703         rtnl_lock();
3704         addrconf_verify_rtnl();
3705         rtnl_unlock();
3706 }
3707
3708 static void addrconf_verify(void)
3709 {
3710         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3711 }
3712
3713 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3714                                      struct in6_addr **peer_pfx)
3715 {
3716         struct in6_addr *pfx = NULL;
3717
3718         *peer_pfx = NULL;
3719
3720         if (addr)
3721                 pfx = nla_data(addr);
3722
3723         if (local) {
3724                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3725                         *peer_pfx = pfx;
3726                 pfx = nla_data(local);
3727         }
3728
3729         return pfx;
3730 }
3731
3732 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3733         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3734         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3735         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3736         [IFA_FLAGS]             = { .len = sizeof(u32) },
3737 };
3738
3739 static int
3740 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3741 {
3742         struct net *net = sock_net(skb->sk);
3743         struct ifaddrmsg *ifm;
3744         struct nlattr *tb[IFA_MAX+1];
3745         struct in6_addr *pfx, *peer_pfx;
3746         int err;
3747
3748         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3749         if (err < 0)
3750                 return err;
3751
3752         ifm = nlmsg_data(nlh);
3753         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3754         if (pfx == NULL)
3755                 return -EINVAL;
3756
3757         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3758 }
3759
3760 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3761                              u32 prefered_lft, u32 valid_lft)
3762 {
3763         u32 flags;
3764         clock_t expires;
3765         unsigned long timeout;
3766         bool was_managetempaddr;
3767         bool had_prefixroute;
3768
3769         ASSERT_RTNL();
3770
3771         if (!valid_lft || (prefered_lft > valid_lft))
3772                 return -EINVAL;
3773
3774         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3775             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3776                 return -EINVAL;
3777
3778         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3779         if (addrconf_finite_timeout(timeout)) {
3780                 expires = jiffies_to_clock_t(timeout * HZ);
3781                 valid_lft = timeout;
3782                 flags = RTF_EXPIRES;
3783         } else {
3784                 expires = 0;
3785                 flags = 0;
3786                 ifa_flags |= IFA_F_PERMANENT;
3787         }
3788
3789         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3790         if (addrconf_finite_timeout(timeout)) {
3791                 if (timeout == 0)
3792                         ifa_flags |= IFA_F_DEPRECATED;
3793                 prefered_lft = timeout;
3794         }
3795
3796         spin_lock_bh(&ifp->lock);
3797         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3798         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3799                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
3800         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3801                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3802                         IFA_F_NOPREFIXROUTE);
3803         ifp->flags |= ifa_flags;
3804         ifp->tstamp = jiffies;
3805         ifp->valid_lft = valid_lft;
3806         ifp->prefered_lft = prefered_lft;
3807
3808         spin_unlock_bh(&ifp->lock);
3809         if (!(ifp->flags&IFA_F_TENTATIVE))
3810                 ipv6_ifa_notify(0, ifp);
3811
3812         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3813                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3814                                       expires, flags);
3815         } else if (had_prefixroute) {
3816                 enum cleanup_prefix_rt_t action;
3817                 unsigned long rt_expires;
3818
3819                 write_lock_bh(&ifp->idev->lock);
3820                 action = check_cleanup_prefix_route(ifp, &rt_expires);
3821                 write_unlock_bh(&ifp->idev->lock);
3822
3823                 if (action != CLEANUP_PREFIX_RT_NOP) {
3824                         cleanup_prefix_route(ifp, rt_expires,
3825                                 action == CLEANUP_PREFIX_RT_DEL);
3826                 }
3827         }
3828
3829         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3830                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3831                         valid_lft = prefered_lft = 0;
3832                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3833                                  !was_managetempaddr, jiffies);
3834         }
3835
3836         addrconf_verify_rtnl();
3837
3838         return 0;
3839 }
3840
3841 static int
3842 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3843 {
3844         struct net *net = sock_net(skb->sk);
3845         struct ifaddrmsg *ifm;
3846         struct nlattr *tb[IFA_MAX+1];
3847         struct in6_addr *pfx, *peer_pfx;
3848         struct inet6_ifaddr *ifa;
3849         struct net_device *dev;
3850         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3851         u32 ifa_flags;
3852         int err;
3853
3854         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3855         if (err < 0)
3856                 return err;
3857
3858         ifm = nlmsg_data(nlh);
3859         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3860         if (pfx == NULL)
3861                 return -EINVAL;
3862
3863         if (tb[IFA_CACHEINFO]) {
3864                 struct ifa_cacheinfo *ci;
3865
3866                 ci = nla_data(tb[IFA_CACHEINFO]);
3867                 valid_lft = ci->ifa_valid;
3868                 preferred_lft = ci->ifa_prefered;
3869         } else {
3870                 preferred_lft = INFINITY_LIFE_TIME;
3871                 valid_lft = INFINITY_LIFE_TIME;
3872         }
3873
3874         dev =  __dev_get_by_index(net, ifm->ifa_index);
3875         if (dev == NULL)
3876                 return -ENODEV;
3877
3878         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3879
3880         /* We ignore other flags so far. */
3881         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3882                      IFA_F_NOPREFIXROUTE;
3883
3884         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3885         if (ifa == NULL) {
3886                 /*
3887                  * It would be best to check for !NLM_F_CREATE here but
3888                  * userspace already relies on not having to provide this.
3889                  */
3890                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3891                                       ifm->ifa_prefixlen, ifa_flags,
3892                                       preferred_lft, valid_lft);
3893         }
3894
3895         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3896             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3897                 err = -EEXIST;
3898         else
3899                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3900
3901         in6_ifa_put(ifa);
3902
3903         return err;
3904 }
3905
3906 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3907                           u8 scope, int ifindex)
3908 {
3909         struct ifaddrmsg *ifm;
3910
3911         ifm = nlmsg_data(nlh);
3912         ifm->ifa_family = AF_INET6;
3913         ifm->ifa_prefixlen = prefixlen;
3914         ifm->ifa_flags = flags;
3915         ifm->ifa_scope = scope;
3916         ifm->ifa_index = ifindex;
3917 }
3918
3919 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3920                          unsigned long tstamp, u32 preferred, u32 valid)
3921 {
3922         struct ifa_cacheinfo ci;
3923
3924         ci.cstamp = cstamp_delta(cstamp);
3925         ci.tstamp = cstamp_delta(tstamp);
3926         ci.ifa_prefered = preferred;
3927         ci.ifa_valid = valid;
3928
3929         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3930 }
3931
3932 static inline int rt_scope(int ifa_scope)
3933 {
3934         if (ifa_scope & IFA_HOST)
3935                 return RT_SCOPE_HOST;
3936         else if (ifa_scope & IFA_LINK)
3937                 return RT_SCOPE_LINK;
3938         else if (ifa_scope & IFA_SITE)
3939                 return RT_SCOPE_SITE;
3940         else
3941                 return RT_SCOPE_UNIVERSE;
3942 }
3943
3944 static inline int inet6_ifaddr_msgsize(void)
3945 {
3946         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3947                + nla_total_size(16) /* IFA_LOCAL */
3948                + nla_total_size(16) /* IFA_ADDRESS */
3949                + nla_total_size(sizeof(struct ifa_cacheinfo))
3950                + nla_total_size(4)  /* IFA_FLAGS */;
3951 }
3952
3953 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3954                              u32 portid, u32 seq, int event, unsigned int flags)
3955 {
3956         struct nlmsghdr  *nlh;
3957         u32 preferred, valid;
3958
3959         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3960         if (nlh == NULL)
3961                 return -EMSGSIZE;
3962
3963         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3964                       ifa->idev->dev->ifindex);
3965
3966         if (!((ifa->flags&IFA_F_PERMANENT) &&
3967               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3968                 preferred = ifa->prefered_lft;
3969                 valid = ifa->valid_lft;
3970                 if (preferred != INFINITY_LIFE_TIME) {
3971                         long tval = (jiffies - ifa->tstamp)/HZ;
3972                         if (preferred > tval)
3973                                 preferred -= tval;
3974                         else
3975                                 preferred = 0;
3976                         if (valid != INFINITY_LIFE_TIME) {
3977                                 if (valid > tval)
3978                                         valid -= tval;
3979                                 else
3980                                         valid = 0;
3981                         }
3982                 }
3983         } else {
3984                 preferred = INFINITY_LIFE_TIME;
3985                 valid = INFINITY_LIFE_TIME;
3986         }
3987
3988         if (!ipv6_addr_any(&ifa->peer_addr)) {
3989                 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3990                     nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3991                         goto error;
3992         } else
3993                 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3994                         goto error;
3995
3996         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3997                 goto error;
3998
3999         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4000                 goto error;
4001
4002         return nlmsg_end(skb, nlh);
4003
4004 error:
4005         nlmsg_cancel(skb, nlh);
4006         return -EMSGSIZE;
4007 }
4008
4009 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4010                                 u32 portid, u32 seq, int event, u16 flags)
4011 {
4012         struct nlmsghdr  *nlh;
4013         u8 scope = RT_SCOPE_UNIVERSE;
4014         int ifindex = ifmca->idev->dev->ifindex;
4015
4016         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4017                 scope = RT_SCOPE_SITE;
4018
4019         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4020         if (nlh == NULL)
4021                 return -EMSGSIZE;
4022
4023         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4024         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4025             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4026                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4027                 nlmsg_cancel(skb, nlh);
4028                 return -EMSGSIZE;
4029         }
4030
4031         return nlmsg_end(skb, nlh);
4032 }
4033
4034 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4035                                 u32 portid, u32 seq, int event, unsigned int flags)
4036 {
4037         struct nlmsghdr  *nlh;
4038         u8 scope = RT_SCOPE_UNIVERSE;
4039         int ifindex = ifaca->aca_idev->dev->ifindex;
4040
4041         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4042                 scope = RT_SCOPE_SITE;
4043
4044         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4045         if (nlh == NULL)
4046                 return -EMSGSIZE;
4047
4048         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4049         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4050             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4051                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4052                 nlmsg_cancel(skb, nlh);
4053                 return -EMSGSIZE;
4054         }
4055
4056         return nlmsg_end(skb, nlh);
4057 }
4058
4059 enum addr_type_t {
4060         UNICAST_ADDR,
4061         MULTICAST_ADDR,
4062         ANYCAST_ADDR,
4063 };
4064
4065 /* called with rcu_read_lock() */
4066 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4067                           struct netlink_callback *cb, enum addr_type_t type,
4068                           int s_ip_idx, int *p_ip_idx)
4069 {
4070         struct ifmcaddr6 *ifmca;
4071         struct ifacaddr6 *ifaca;
4072         int err = 1;
4073         int ip_idx = *p_ip_idx;
4074
4075         read_lock_bh(&idev->lock);
4076         switch (type) {
4077         case UNICAST_ADDR: {
4078                 struct inet6_ifaddr *ifa;
4079
4080                 /* unicast address incl. temp addr */
4081                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4082                         if (++ip_idx < s_ip_idx)
4083                                 continue;
4084                         err = inet6_fill_ifaddr(skb, ifa,
4085                                                 NETLINK_CB(cb->skb).portid,
4086                                                 cb->nlh->nlmsg_seq,
4087                                                 RTM_NEWADDR,
4088                                                 NLM_F_MULTI);
4089                         if (err <= 0)
4090                                 break;
4091                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4092                 }
4093                 break;
4094         }
4095         case MULTICAST_ADDR:
4096                 /* multicast address */
4097                 for (ifmca = idev->mc_list; ifmca;
4098                      ifmca = ifmca->next, ip_idx++) {
4099                         if (ip_idx < s_ip_idx)
4100                                 continue;
4101                         err = inet6_fill_ifmcaddr(skb, ifmca,
4102                                                   NETLINK_CB(cb->skb).portid,
4103                                                   cb->nlh->nlmsg_seq,
4104                                                   RTM_GETMULTICAST,
4105                                                   NLM_F_MULTI);
4106                         if (err <= 0)
4107                                 break;
4108                 }
4109                 break;
4110         case ANYCAST_ADDR:
4111                 /* anycast address */
4112                 for (ifaca = idev->ac_list; ifaca;
4113                      ifaca = ifaca->aca_next, ip_idx++) {
4114                         if (ip_idx < s_ip_idx)
4115                                 continue;
4116                         err = inet6_fill_ifacaddr(skb, ifaca,
4117                                                   NETLINK_CB(cb->skb).portid,
4118                                                   cb->nlh->nlmsg_seq,
4119                                                   RTM_GETANYCAST,
4120                                                   NLM_F_MULTI);
4121                         if (err <= 0)
4122                                 break;
4123                 }
4124                 break;
4125         default:
4126                 break;
4127         }
4128         read_unlock_bh(&idev->lock);
4129         *p_ip_idx = ip_idx;
4130         return err;
4131 }
4132
4133 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4134                            enum addr_type_t type)
4135 {
4136         struct net *net = sock_net(skb->sk);
4137         int h, s_h;
4138         int idx, ip_idx;
4139         int s_idx, s_ip_idx;
4140         struct net_device *dev;
4141         struct inet6_dev *idev;
4142         struct hlist_head *head;
4143
4144         s_h = cb->args[0];
4145         s_idx = idx = cb->args[1];
4146         s_ip_idx = ip_idx = cb->args[2];
4147
4148         rcu_read_lock();
4149         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4150         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4151                 idx = 0;
4152                 head = &net->dev_index_head[h];
4153                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4154                         if (idx < s_idx)
4155                                 goto cont;
4156                         if (h > s_h || idx > s_idx)
4157                                 s_ip_idx = 0;
4158                         ip_idx = 0;
4159                         idev = __in6_dev_get(dev);
4160                         if (!idev)
4161                                 goto cont;
4162
4163                         if (in6_dump_addrs(idev, skb, cb, type,
4164                                            s_ip_idx, &ip_idx) <= 0)
4165                                 goto done;
4166 cont:
4167                         idx++;
4168                 }
4169         }
4170 done:
4171         rcu_read_unlock();
4172         cb->args[0] = h;
4173         cb->args[1] = idx;
4174         cb->args[2] = ip_idx;
4175
4176         return skb->len;
4177 }
4178
4179 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4180 {
4181         enum addr_type_t type = UNICAST_ADDR;
4182
4183         return inet6_dump_addr(skb, cb, type);
4184 }
4185
4186 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4187 {
4188         enum addr_type_t type = MULTICAST_ADDR;
4189
4190         return inet6_dump_addr(skb, cb, type);
4191 }
4192
4193
4194 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4195 {
4196         enum addr_type_t type = ANYCAST_ADDR;
4197
4198         return inet6_dump_addr(skb, cb, type);
4199 }
4200
4201 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4202 {
4203         struct net *net = sock_net(in_skb->sk);
4204         struct ifaddrmsg *ifm;
4205         struct nlattr *tb[IFA_MAX+1];
4206         struct in6_addr *addr = NULL, *peer;
4207         struct net_device *dev = NULL;
4208         struct inet6_ifaddr *ifa;
4209         struct sk_buff *skb;
4210         int err;
4211
4212         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4213         if (err < 0)
4214                 goto errout;
4215
4216         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4217         if (addr == NULL) {
4218                 err = -EINVAL;
4219                 goto errout;
4220         }
4221
4222         ifm = nlmsg_data(nlh);
4223         if (ifm->ifa_index)
4224                 dev = __dev_get_by_index(net, ifm->ifa_index);
4225
4226         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4227         if (!ifa) {
4228                 err = -EADDRNOTAVAIL;
4229                 goto errout;
4230         }
4231
4232         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4233         if (!skb) {
4234                 err = -ENOBUFS;
4235                 goto errout_ifa;
4236         }
4237
4238         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4239                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4240         if (err < 0) {
4241                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4242                 WARN_ON(err == -EMSGSIZE);
4243                 kfree_skb(skb);
4244                 goto errout_ifa;
4245         }
4246         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4247 errout_ifa:
4248         in6_ifa_put(ifa);
4249 errout:
4250         return err;
4251 }
4252
4253 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4254 {
4255         struct sk_buff *skb;
4256         struct net *net = dev_net(ifa->idev->dev);
4257         int err = -ENOBUFS;
4258
4259         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4260         if (skb == NULL)
4261                 goto errout;
4262
4263         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4264         if (err < 0) {
4265                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4266                 WARN_ON(err == -EMSGSIZE);
4267                 kfree_skb(skb);
4268                 goto errout;
4269         }
4270         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4271         return;
4272 errout:
4273         if (err < 0)
4274                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4275 }
4276
4277 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4278                                 __s32 *array, int bytes)
4279 {
4280         BUG_ON(bytes < (DEVCONF_MAX * 4));
4281
4282         memset(array, 0, bytes);
4283         array[DEVCONF_FORWARDING] = cnf->forwarding;
4284         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4285         array[DEVCONF_MTU6] = cnf->mtu6;
4286         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4287         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4288         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4289         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4290         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4291         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4292                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4293         array[DEVCONF_RTR_SOLICIT_DELAY] =
4294                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4295         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4296         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4297                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4298         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4299                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4300         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4301         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4302         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4303         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4304         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4305         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4306         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4307         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4308 #ifdef CONFIG_IPV6_ROUTER_PREF
4309         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4310         array[DEVCONF_RTR_PROBE_INTERVAL] =
4311                 jiffies_to_msecs(cnf->rtr_probe_interval);
4312 #ifdef CONFIG_IPV6_ROUTE_INFO
4313         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4314 #endif
4315 #endif
4316         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4317         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4318 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4319         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4320 #endif
4321 #ifdef CONFIG_IPV6_MROUTE
4322         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4323 #endif
4324         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4325         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4326         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4327         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4328         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4329 }
4330
4331 static inline size_t inet6_ifla6_size(void)
4332 {
4333         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4334              + nla_total_size(sizeof(struct ifla_cacheinfo))
4335              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4336              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4337              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4338              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4339 }
4340
4341 static inline size_t inet6_if_nlmsg_size(void)
4342 {
4343         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4344                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4345                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4346                + nla_total_size(4) /* IFLA_MTU */
4347                + nla_total_size(4) /* IFLA_LINK */
4348                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4349 }
4350
4351 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4352                                       int items, int bytes)
4353 {
4354         int i;
4355         int pad = bytes - sizeof(u64) * items;
4356         BUG_ON(pad < 0);
4357
4358         /* Use put_unaligned() because stats may not be aligned for u64. */
4359         put_unaligned(items, &stats[0]);
4360         for (i = 1; i < items; i++)
4361                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4362
4363         memset(&stats[items], 0, pad);
4364 }
4365
4366 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4367                                       int items, int bytes, size_t syncpoff)
4368 {
4369         int i;
4370         int pad = bytes - sizeof(u64) * items;
4371         BUG_ON(pad < 0);
4372
4373         /* Use put_unaligned() because stats may not be aligned for u64. */
4374         put_unaligned(items, &stats[0]);
4375         for (i = 1; i < items; i++)
4376                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4377
4378         memset(&stats[items], 0, pad);
4379 }
4380
4381 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4382                              int bytes)
4383 {
4384         switch (attrtype) {
4385         case IFLA_INET6_STATS:
4386                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4387                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4388                 break;
4389         case IFLA_INET6_ICMP6STATS:
4390                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4391                 break;
4392         }
4393 }
4394
4395 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4396 {
4397         struct nlattr *nla;
4398         struct ifla_cacheinfo ci;
4399
4400         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4401                 goto nla_put_failure;
4402         ci.max_reasm_len = IPV6_MAXPLEN;
4403         ci.tstamp = cstamp_delta(idev->tstamp);
4404         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4405         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4406         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4407                 goto nla_put_failure;
4408         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4409         if (nla == NULL)
4410                 goto nla_put_failure;
4411         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4412
4413         /* XXX - MC not implemented */
4414
4415         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4416         if (nla == NULL)
4417                 goto nla_put_failure;
4418         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4419
4420         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4421         if (nla == NULL)
4422                 goto nla_put_failure;
4423         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4424
4425         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4426         if (nla == NULL)
4427                 goto nla_put_failure;
4428         read_lock_bh(&idev->lock);
4429         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4430         read_unlock_bh(&idev->lock);
4431
4432         return 0;
4433
4434 nla_put_failure:
4435         return -EMSGSIZE;
4436 }
4437
4438 static size_t inet6_get_link_af_size(const struct net_device *dev)
4439 {
4440         if (!__in6_dev_get(dev))
4441                 return 0;
4442
4443         return inet6_ifla6_size();
4444 }
4445
4446 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4447 {
4448         struct inet6_dev *idev = __in6_dev_get(dev);
4449
4450         if (!idev)
4451                 return -ENODATA;
4452
4453         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4454                 return -EMSGSIZE;
4455
4456         return 0;
4457 }
4458
4459 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4460 {
4461         struct inet6_ifaddr *ifp;
4462         struct net_device *dev = idev->dev;
4463         bool update_rs = false;
4464         struct in6_addr ll_addr;
4465
4466         ASSERT_RTNL();
4467
4468         if (token == NULL)
4469                 return -EINVAL;
4470         if (ipv6_addr_any(token))
4471                 return -EINVAL;
4472         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4473                 return -EINVAL;
4474         if (!ipv6_accept_ra(idev))
4475                 return -EINVAL;
4476         if (idev->cnf.rtr_solicits <= 0)
4477                 return -EINVAL;
4478
4479         write_lock_bh(&idev->lock);
4480
4481         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4482         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4483
4484         write_unlock_bh(&idev->lock);
4485
4486         if (!idev->dead && (idev->if_flags & IF_READY) &&
4487             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4488                              IFA_F_OPTIMISTIC)) {
4489
4490                 /* If we're not ready, then normal ifup will take care
4491                  * of this. Otherwise, we need to request our rs here.
4492                  */
4493                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4494                 update_rs = true;
4495         }
4496
4497         write_lock_bh(&idev->lock);
4498
4499         if (update_rs) {
4500                 idev->if_flags |= IF_RS_SENT;
4501                 idev->rs_probes = 1;
4502                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4503         }
4504
4505         /* Well, that's kinda nasty ... */
4506         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4507                 spin_lock(&ifp->lock);
4508                 if (ifp->tokenized) {
4509                         ifp->valid_lft = 0;
4510                         ifp->prefered_lft = 0;
4511                 }
4512                 spin_unlock(&ifp->lock);
4513         }
4514
4515         write_unlock_bh(&idev->lock);
4516         addrconf_verify_rtnl();
4517         return 0;
4518 }
4519
4520 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4521 {
4522         int err = -EINVAL;
4523         struct inet6_dev *idev = __in6_dev_get(dev);
4524         struct nlattr *tb[IFLA_INET6_MAX + 1];
4525
4526         if (!idev)
4527                 return -EAFNOSUPPORT;
4528
4529         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4530                 BUG();
4531
4532         if (tb[IFLA_INET6_TOKEN])
4533                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4534
4535         return err;
4536 }
4537
4538 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4539                              u32 portid, u32 seq, int event, unsigned int flags)
4540 {
4541         struct net_device *dev = idev->dev;
4542         struct ifinfomsg *hdr;
4543         struct nlmsghdr *nlh;
4544         void *protoinfo;
4545
4546         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4547         if (nlh == NULL)
4548                 return -EMSGSIZE;
4549
4550         hdr = nlmsg_data(nlh);
4551         hdr->ifi_family = AF_INET6;
4552         hdr->__ifi_pad = 0;
4553         hdr->ifi_type = dev->type;
4554         hdr->ifi_index = dev->ifindex;
4555         hdr->ifi_flags = dev_get_flags(dev);
4556         hdr->ifi_change = 0;
4557
4558         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4559             (dev->addr_len &&
4560              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4561             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4562             (dev->ifindex != dev->iflink &&
4563              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4564                 goto nla_put_failure;
4565         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4566         if (protoinfo == NULL)
4567                 goto nla_put_failure;
4568
4569         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4570                 goto nla_put_failure;
4571
4572         nla_nest_end(skb, protoinfo);
4573         return nlmsg_end(skb, nlh);
4574
4575 nla_put_failure:
4576         nlmsg_cancel(skb, nlh);
4577         return -EMSGSIZE;
4578 }
4579
4580 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4581 {
4582         struct net *net = sock_net(skb->sk);
4583         int h, s_h;
4584         int idx = 0, s_idx;
4585         struct net_device *dev;
4586         struct inet6_dev *idev;
4587         struct hlist_head *head;
4588
4589         s_h = cb->args[0];
4590         s_idx = cb->args[1];
4591
4592         rcu_read_lock();
4593         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4594                 idx = 0;
4595                 head = &net->dev_index_head[h];
4596                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4597                         if (idx < s_idx)
4598                                 goto cont;
4599                         idev = __in6_dev_get(dev);
4600                         if (!idev)
4601                                 goto cont;
4602                         if (inet6_fill_ifinfo(skb, idev,
4603                                               NETLINK_CB(cb->skb).portid,
4604                                               cb->nlh->nlmsg_seq,
4605                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4606                                 goto out;
4607 cont:
4608                         idx++;
4609                 }
4610         }
4611 out:
4612         rcu_read_unlock();
4613         cb->args[1] = idx;
4614         cb->args[0] = h;
4615
4616         return skb->len;
4617 }
4618
4619 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4620 {
4621         struct sk_buff *skb;
4622         struct net *net = dev_net(idev->dev);
4623         int err = -ENOBUFS;
4624
4625         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4626         if (skb == NULL)
4627                 goto errout;
4628
4629         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4630         if (err < 0) {
4631                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4632                 WARN_ON(err == -EMSGSIZE);
4633                 kfree_skb(skb);
4634                 goto errout;
4635         }
4636         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4637         return;
4638 errout:
4639         if (err < 0)
4640                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4641 }
4642
4643 static inline size_t inet6_prefix_nlmsg_size(void)
4644 {
4645         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4646                + nla_total_size(sizeof(struct in6_addr))
4647                + nla_total_size(sizeof(struct prefix_cacheinfo));
4648 }
4649
4650 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4651                              struct prefix_info *pinfo, u32 portid, u32 seq,
4652                              int event, unsigned int flags)
4653 {
4654         struct prefixmsg *pmsg;
4655         struct nlmsghdr *nlh;
4656         struct prefix_cacheinfo ci;
4657
4658         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4659         if (nlh == NULL)
4660                 return -EMSGSIZE;
4661
4662         pmsg = nlmsg_data(nlh);
4663         pmsg->prefix_family = AF_INET6;
4664         pmsg->prefix_pad1 = 0;
4665         pmsg->prefix_pad2 = 0;
4666         pmsg->prefix_ifindex = idev->dev->ifindex;
4667         pmsg->prefix_len = pinfo->prefix_len;
4668         pmsg->prefix_type = pinfo->type;
4669         pmsg->prefix_pad3 = 0;
4670         pmsg->prefix_flags = 0;
4671         if (pinfo->onlink)
4672                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4673         if (pinfo->autoconf)
4674                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4675
4676         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4677                 goto nla_put_failure;
4678         ci.preferred_time = ntohl(pinfo->prefered);
4679         ci.valid_time = ntohl(pinfo->valid);
4680         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4681                 goto nla_put_failure;
4682         return nlmsg_end(skb, nlh);
4683
4684 nla_put_failure:
4685         nlmsg_cancel(skb, nlh);
4686         return -EMSGSIZE;
4687 }
4688
4689 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4690                          struct prefix_info *pinfo)
4691 {
4692         struct sk_buff *skb;
4693         struct net *net = dev_net(idev->dev);
4694         int err = -ENOBUFS;
4695
4696         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4697         if (skb == NULL)
4698                 goto errout;
4699
4700         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4701         if (err < 0) {
4702                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4703                 WARN_ON(err == -EMSGSIZE);
4704                 kfree_skb(skb);
4705                 goto errout;
4706         }
4707         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4708         return;
4709 errout:
4710         if (err < 0)
4711                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4712 }
4713
4714 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4715 {
4716         struct net *net = dev_net(ifp->idev->dev);
4717
4718         if (event)
4719                 ASSERT_RTNL();
4720
4721         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4722
4723         switch (event) {
4724         case RTM_NEWADDR:
4725                 /*
4726                  * If the address was optimistic
4727                  * we inserted the route at the start of
4728                  * our DAD process, so we don't need
4729                  * to do it again
4730                  */
4731                 if (!(ifp->rt->rt6i_node))
4732                         ip6_ins_rt(ifp->rt);
4733                 if (ifp->idev->cnf.forwarding)
4734                         addrconf_join_anycast(ifp);
4735                 if (!ipv6_addr_any(&ifp->peer_addr))
4736                         addrconf_prefix_route(&ifp->peer_addr, 128,
4737                                               ifp->idev->dev, 0, 0);
4738                 break;
4739         case RTM_DELADDR:
4740                 if (ifp->idev->cnf.forwarding)
4741                         addrconf_leave_anycast(ifp);
4742                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4743                 if (!ipv6_addr_any(&ifp->peer_addr)) {
4744                         struct rt6_info *rt;
4745                         struct net_device *dev = ifp->idev->dev;
4746
4747                         rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4748                                         dev->ifindex, 1);
4749                         if (rt) {
4750                                 dst_hold(&rt->dst);
4751                                 if (ip6_del_rt(rt))
4752                                         dst_free(&rt->dst);
4753                         }
4754                 }
4755                 dst_hold(&ifp->rt->dst);
4756
4757                 if (ip6_del_rt(ifp->rt))
4758                         dst_free(&ifp->rt->dst);
4759                 break;
4760         }
4761         atomic_inc(&net->ipv6.dev_addr_genid);
4762         rt_genid_bump_ipv6(net);
4763 }
4764
4765 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4766 {
4767         rcu_read_lock_bh();
4768         if (likely(ifp->idev->dead == 0))
4769                 __ipv6_ifa_notify(event, ifp);
4770         rcu_read_unlock_bh();
4771 }
4772
4773 #ifdef CONFIG_SYSCTL
4774
4775 static
4776 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4777                            void __user *buffer, size_t *lenp, loff_t *ppos)
4778 {
4779         int *valp = ctl->data;
4780         int val = *valp;
4781         loff_t pos = *ppos;
4782         struct ctl_table lctl;
4783         int ret;
4784
4785         /*
4786          * ctl->data points to idev->cnf.forwarding, we should
4787          * not modify it until we get the rtnl lock.
4788          */
4789         lctl = *ctl;
4790         lctl.data = &val;
4791
4792         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4793
4794         if (write)
4795                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4796         if (ret)
4797                 *ppos = pos;
4798         return ret;
4799 }
4800
4801 static void dev_disable_change(struct inet6_dev *idev)
4802 {
4803         struct netdev_notifier_info info;
4804
4805         if (!idev || !idev->dev)
4806                 return;
4807
4808         netdev_notifier_info_init(&info, idev->dev);
4809         if (idev->cnf.disable_ipv6)
4810                 addrconf_notify(NULL, NETDEV_DOWN, &info);
4811         else
4812                 addrconf_notify(NULL, NETDEV_UP, &info);
4813 }
4814
4815 static void addrconf_disable_change(struct net *net, __s32 newf)
4816 {
4817         struct net_device *dev;
4818         struct inet6_dev *idev;
4819
4820         rcu_read_lock();
4821         for_each_netdev_rcu(net, dev) {
4822                 idev = __in6_dev_get(dev);
4823                 if (idev) {
4824                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4825                         idev->cnf.disable_ipv6 = newf;
4826                         if (changed)
4827                                 dev_disable_change(idev);
4828                 }
4829         }
4830         rcu_read_unlock();
4831 }
4832
4833 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4834 {
4835         struct net *net;
4836         int old;
4837
4838         if (!rtnl_trylock())
4839                 return restart_syscall();
4840
4841         net = (struct net *)table->extra2;
4842         old = *p;
4843         *p = newf;
4844
4845         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4846                 rtnl_unlock();
4847                 return 0;
4848         }
4849
4850         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4851                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4852                 addrconf_disable_change(net, newf);
4853         } else if ((!newf) ^ (!old))
4854                 dev_disable_change((struct inet6_dev *)table->extra1);
4855
4856         rtnl_unlock();
4857         return 0;
4858 }
4859
4860 static
4861 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4862                             void __user *buffer, size_t *lenp, loff_t *ppos)
4863 {
4864         int *valp = ctl->data;
4865         int val = *valp;
4866         loff_t pos = *ppos;
4867         struct ctl_table lctl;
4868         int ret;
4869
4870         /*
4871          * ctl->data points to idev->cnf.disable_ipv6, we should
4872          * not modify it until we get the rtnl lock.
4873          */
4874         lctl = *ctl;
4875         lctl.data = &val;
4876
4877         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4878
4879         if (write)
4880                 ret = addrconf_disable_ipv6(ctl, valp, val);
4881         if (ret)
4882                 *ppos = pos;
4883         return ret;
4884 }
4885
4886 static
4887 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4888                               void __user *buffer, size_t *lenp, loff_t *ppos)
4889 {
4890         int *valp = ctl->data;
4891         int ret;
4892         int old, new;
4893
4894         old = *valp;
4895         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4896         new = *valp;
4897
4898         if (write && old != new) {
4899                 struct net *net = ctl->extra2;
4900
4901                 if (!rtnl_trylock())
4902                         return restart_syscall();
4903
4904                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4905                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4906                                                      NETCONFA_IFINDEX_DEFAULT,
4907                                                      net->ipv6.devconf_dflt);
4908                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4909                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4910                                                      NETCONFA_IFINDEX_ALL,
4911                                                      net->ipv6.devconf_all);
4912                 else {
4913                         struct inet6_dev *idev = ctl->extra1;
4914
4915                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4916                                                      idev->dev->ifindex,
4917                                                      &idev->cnf);
4918                 }
4919                 rtnl_unlock();
4920         }
4921
4922         return ret;
4923 }
4924
4925
4926 static struct addrconf_sysctl_table
4927 {
4928         struct ctl_table_header *sysctl_header;
4929         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4930 } addrconf_sysctl __read_mostly = {
4931         .sysctl_header = NULL,
4932         .addrconf_vars = {
4933                 {
4934                         .procname       = "forwarding",
4935                         .data           = &ipv6_devconf.forwarding,
4936                         .maxlen         = sizeof(int),
4937                         .mode           = 0644,
4938                         .proc_handler   = addrconf_sysctl_forward,
4939                 },
4940                 {
4941                         .procname       = "hop_limit",
4942                         .data           = &ipv6_devconf.hop_limit,
4943                         .maxlen         = sizeof(int),
4944                         .mode           = 0644,
4945                         .proc_handler   = proc_dointvec,
4946                 },
4947                 {
4948                         .procname       = "mtu",
4949                         .data           = &ipv6_devconf.mtu6,
4950                         .maxlen         = sizeof(int),
4951                         .mode           = 0644,
4952                         .proc_handler   = proc_dointvec,
4953                 },
4954                 {
4955                         .procname       = "accept_ra",
4956                         .data           = &ipv6_devconf.accept_ra,
4957                         .maxlen         = sizeof(int),
4958                         .mode           = 0644,
4959                         .proc_handler   = proc_dointvec,
4960                 },
4961                 {
4962                         .procname       = "accept_redirects",
4963                         .data           = &ipv6_devconf.accept_redirects,
4964                         .maxlen         = sizeof(int),
4965                         .mode           = 0644,
4966                         .proc_handler   = proc_dointvec,
4967                 },
4968                 {
4969                         .procname       = "autoconf",
4970                         .data           = &ipv6_devconf.autoconf,
4971                         .maxlen         = sizeof(int),
4972                         .mode           = 0644,
4973                         .proc_handler   = proc_dointvec,
4974                 },
4975                 {
4976                         .procname       = "dad_transmits",
4977                         .data           = &ipv6_devconf.dad_transmits,
4978                         .maxlen         = sizeof(int),
4979                         .mode           = 0644,
4980                         .proc_handler   = proc_dointvec,
4981                 },
4982                 {
4983                         .procname       = "router_solicitations",
4984                         .data           = &ipv6_devconf.rtr_solicits,
4985                         .maxlen         = sizeof(int),
4986                         .mode           = 0644,
4987                         .proc_handler   = proc_dointvec,
4988                 },
4989                 {
4990                         .procname       = "router_solicitation_interval",
4991                         .data           = &ipv6_devconf.rtr_solicit_interval,
4992                         .maxlen         = sizeof(int),
4993                         .mode           = 0644,
4994                         .proc_handler   = proc_dointvec_jiffies,
4995                 },
4996                 {
4997                         .procname       = "router_solicitation_delay",
4998                         .data           = &ipv6_devconf.rtr_solicit_delay,
4999                         .maxlen         = sizeof(int),
5000                         .mode           = 0644,
5001                         .proc_handler   = proc_dointvec_jiffies,
5002                 },
5003                 {
5004                         .procname       = "force_mld_version",
5005                         .data           = &ipv6_devconf.force_mld_version,
5006                         .maxlen         = sizeof(int),
5007                         .mode           = 0644,
5008                         .proc_handler   = proc_dointvec,
5009                 },
5010                 {
5011                         .procname       = "mldv1_unsolicited_report_interval",
5012                         .data           =
5013                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
5014                         .maxlen         = sizeof(int),
5015                         .mode           = 0644,
5016                         .proc_handler   = proc_dointvec_ms_jiffies,
5017                 },
5018                 {
5019                         .procname       = "mldv2_unsolicited_report_interval",
5020                         .data           =
5021                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
5022                         .maxlen         = sizeof(int),
5023                         .mode           = 0644,
5024                         .proc_handler   = proc_dointvec_ms_jiffies,
5025                 },
5026                 {
5027                         .procname       = "use_tempaddr",
5028                         .data           = &ipv6_devconf.use_tempaddr,
5029                         .maxlen         = sizeof(int),
5030                         .mode           = 0644,
5031                         .proc_handler   = proc_dointvec,
5032                 },
5033                 {
5034                         .procname       = "temp_valid_lft",
5035                         .data           = &ipv6_devconf.temp_valid_lft,
5036                         .maxlen         = sizeof(int),
5037                         .mode           = 0644,
5038                         .proc_handler   = proc_dointvec,
5039                 },
5040                 {
5041                         .procname       = "temp_prefered_lft",
5042                         .data           = &ipv6_devconf.temp_prefered_lft,
5043                         .maxlen         = sizeof(int),
5044                         .mode           = 0644,
5045                         .proc_handler   = proc_dointvec,
5046                 },
5047                 {
5048                         .procname       = "regen_max_retry",
5049                         .data           = &ipv6_devconf.regen_max_retry,
5050                         .maxlen         = sizeof(int),
5051                         .mode           = 0644,
5052                         .proc_handler   = proc_dointvec,
5053                 },
5054                 {
5055                         .procname       = "max_desync_factor",
5056                         .data           = &ipv6_devconf.max_desync_factor,
5057                         .maxlen         = sizeof(int),
5058                         .mode           = 0644,
5059                         .proc_handler   = proc_dointvec,
5060                 },
5061                 {
5062                         .procname       = "max_addresses",
5063                         .data           = &ipv6_devconf.max_addresses,
5064                         .maxlen         = sizeof(int),
5065                         .mode           = 0644,
5066                         .proc_handler   = proc_dointvec,
5067                 },
5068                 {
5069                         .procname       = "accept_ra_defrtr",
5070                         .data           = &ipv6_devconf.accept_ra_defrtr,
5071                         .maxlen         = sizeof(int),
5072                         .mode           = 0644,
5073                         .proc_handler   = proc_dointvec,
5074                 },
5075                 {
5076                         .procname       = "accept_ra_pinfo",
5077                         .data           = &ipv6_devconf.accept_ra_pinfo,
5078                         .maxlen         = sizeof(int),
5079                         .mode           = 0644,
5080                         .proc_handler   = proc_dointvec,
5081                 },
5082 #ifdef CONFIG_IPV6_ROUTER_PREF
5083                 {
5084                         .procname       = "accept_ra_rtr_pref",
5085                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
5086                         .maxlen         = sizeof(int),
5087                         .mode           = 0644,
5088                         .proc_handler   = proc_dointvec,
5089                 },
5090                 {
5091                         .procname       = "router_probe_interval",
5092                         .data           = &ipv6_devconf.rtr_probe_interval,
5093                         .maxlen         = sizeof(int),
5094                         .mode           = 0644,
5095                         .proc_handler   = proc_dointvec_jiffies,
5096                 },
5097 #ifdef CONFIG_IPV6_ROUTE_INFO
5098                 {
5099                         .procname       = "accept_ra_rt_info_max_plen",
5100                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5101                         .maxlen         = sizeof(int),
5102                         .mode           = 0644,
5103                         .proc_handler   = proc_dointvec,
5104                 },
5105 #endif
5106 #endif
5107                 {
5108                         .procname       = "proxy_ndp",
5109                         .data           = &ipv6_devconf.proxy_ndp,
5110                         .maxlen         = sizeof(int),
5111                         .mode           = 0644,
5112                         .proc_handler   = addrconf_sysctl_proxy_ndp,
5113                 },
5114                 {
5115                         .procname       = "accept_source_route",
5116                         .data           = &ipv6_devconf.accept_source_route,
5117                         .maxlen         = sizeof(int),
5118                         .mode           = 0644,
5119                         .proc_handler   = proc_dointvec,
5120                 },
5121 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5122                 {
5123                         .procname       = "optimistic_dad",
5124                         .data           = &ipv6_devconf.optimistic_dad,
5125                         .maxlen         = sizeof(int),
5126                         .mode           = 0644,
5127                         .proc_handler   = proc_dointvec,
5128
5129                 },
5130 #endif
5131 #ifdef CONFIG_IPV6_MROUTE
5132                 {
5133                         .procname       = "mc_forwarding",
5134                         .data           = &ipv6_devconf.mc_forwarding,
5135                         .maxlen         = sizeof(int),
5136                         .mode           = 0444,
5137                         .proc_handler   = proc_dointvec,
5138                 },
5139 #endif
5140                 {
5141                         .procname       = "disable_ipv6",
5142                         .data           = &ipv6_devconf.disable_ipv6,
5143                         .maxlen         = sizeof(int),
5144                         .mode           = 0644,
5145                         .proc_handler   = addrconf_sysctl_disable,
5146                 },
5147                 {
5148                         .procname       = "accept_dad",
5149                         .data           = &ipv6_devconf.accept_dad,
5150                         .maxlen         = sizeof(int),
5151                         .mode           = 0644,
5152                         .proc_handler   = proc_dointvec,
5153                 },
5154                 {
5155                         .procname       = "force_tllao",
5156                         .data           = &ipv6_devconf.force_tllao,
5157                         .maxlen         = sizeof(int),
5158                         .mode           = 0644,
5159                         .proc_handler   = proc_dointvec
5160                 },
5161                 {
5162                         .procname       = "ndisc_notify",
5163                         .data           = &ipv6_devconf.ndisc_notify,
5164                         .maxlen         = sizeof(int),
5165                         .mode           = 0644,
5166                         .proc_handler   = proc_dointvec
5167                 },
5168                 {
5169                         .procname       = "suppress_frag_ndisc",
5170                         .data           = &ipv6_devconf.suppress_frag_ndisc,
5171                         .maxlen         = sizeof(int),
5172                         .mode           = 0644,
5173                         .proc_handler   = proc_dointvec
5174                 },
5175                 {
5176                         /* sentinel */
5177                 }
5178         },
5179 };
5180
5181 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5182                 struct inet6_dev *idev, struct ipv6_devconf *p)
5183 {
5184         int i;
5185         struct addrconf_sysctl_table *t;
5186         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5187
5188         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5189         if (t == NULL)
5190                 goto out;
5191
5192         for (i = 0; t->addrconf_vars[i].data; i++) {
5193                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5194                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5195                 t->addrconf_vars[i].extra2 = net;
5196         }
5197
5198         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5199
5200         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5201         if (t->sysctl_header == NULL)
5202                 goto free;
5203
5204         p->sysctl = t;
5205         return 0;
5206
5207 free:
5208         kfree(t);
5209 out:
5210         return -ENOBUFS;
5211 }
5212
5213 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5214 {
5215         struct addrconf_sysctl_table *t;
5216
5217         if (p->sysctl == NULL)
5218                 return;
5219
5220         t = p->sysctl;
5221         p->sysctl = NULL;
5222         unregister_net_sysctl_table(t->sysctl_header);
5223         kfree(t);
5224 }
5225
5226 static void addrconf_sysctl_register(struct inet6_dev *idev)
5227 {
5228         neigh_sysctl_register(idev->dev, idev->nd_parms,
5229                               &ndisc_ifinfo_sysctl_change);
5230         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5231                                         idev, &idev->cnf);
5232 }
5233
5234 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5235 {
5236         __addrconf_sysctl_unregister(&idev->cnf);
5237         neigh_sysctl_unregister(idev->nd_parms);
5238 }
5239
5240
5241 #endif
5242
5243 static int __net_init addrconf_init_net(struct net *net)
5244 {
5245         int err = -ENOMEM;
5246         struct ipv6_devconf *all, *dflt;
5247
5248         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5249         if (all == NULL)
5250                 goto err_alloc_all;
5251
5252         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5253         if (dflt == NULL)
5254                 goto err_alloc_dflt;
5255
5256         /* these will be inherited by all namespaces */
5257         dflt->autoconf = ipv6_defaults.autoconf;
5258         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5259
5260         net->ipv6.devconf_all = all;
5261         net->ipv6.devconf_dflt = dflt;
5262
5263 #ifdef CONFIG_SYSCTL
5264         err = __addrconf_sysctl_register(net, "all", NULL, all);
5265         if (err < 0)
5266                 goto err_reg_all;
5267
5268         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5269         if (err < 0)
5270                 goto err_reg_dflt;
5271 #endif
5272         return 0;
5273
5274 #ifdef CONFIG_SYSCTL
5275 err_reg_dflt:
5276         __addrconf_sysctl_unregister(all);
5277 err_reg_all:
5278         kfree(dflt);
5279 #endif
5280 err_alloc_dflt:
5281         kfree(all);
5282 err_alloc_all:
5283         return err;
5284 }
5285
5286 static void __net_exit addrconf_exit_net(struct net *net)
5287 {
5288 #ifdef CONFIG_SYSCTL
5289         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5290         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5291 #endif
5292         if (!net_eq(net, &init_net)) {
5293                 kfree(net->ipv6.devconf_dflt);
5294                 kfree(net->ipv6.devconf_all);
5295         }
5296 }
5297
5298 static struct pernet_operations addrconf_ops = {
5299         .init = addrconf_init_net,
5300         .exit = addrconf_exit_net,
5301 };
5302
5303 static struct rtnl_af_ops inet6_ops = {
5304         .family           = AF_INET6,
5305         .fill_link_af     = inet6_fill_link_af,
5306         .get_link_af_size = inet6_get_link_af_size,
5307         .set_link_af      = inet6_set_link_af,
5308 };
5309
5310 /*
5311  *      Init / cleanup code
5312  */
5313
5314 int __init addrconf_init(void)
5315 {
5316         int i, err;
5317
5318         err = ipv6_addr_label_init();
5319         if (err < 0) {
5320                 pr_crit("%s: cannot initialize default policy table: %d\n",
5321                         __func__, err);
5322                 goto out;
5323         }
5324
5325         err = register_pernet_subsys(&addrconf_ops);
5326         if (err < 0)
5327                 goto out_addrlabel;
5328
5329         addrconf_wq = create_workqueue("ipv6_addrconf");
5330         if (!addrconf_wq) {
5331                 err = -ENOMEM;
5332                 goto out_nowq;
5333         }
5334
5335         /* The addrconf netdev notifier requires that loopback_dev
5336          * has it's ipv6 private information allocated and setup
5337          * before it can bring up and give link-local addresses
5338          * to other devices which are up.
5339          *
5340          * Unfortunately, loopback_dev is not necessarily the first
5341          * entry in the global dev_base list of net devices.  In fact,
5342          * it is likely to be the very last entry on that list.
5343          * So this causes the notifier registry below to try and
5344          * give link-local addresses to all devices besides loopback_dev
5345          * first, then loopback_dev, which cases all the non-loopback_dev
5346          * devices to fail to get a link-local address.
5347          *
5348          * So, as a temporary fix, allocate the ipv6 structure for
5349          * loopback_dev first by hand.
5350          * Longer term, all of the dependencies ipv6 has upon the loopback
5351          * device and it being up should be removed.
5352          */
5353         rtnl_lock();
5354         if (!ipv6_add_dev(init_net.loopback_dev))
5355                 err = -ENOMEM;
5356         rtnl_unlock();
5357         if (err)
5358                 goto errlo;
5359
5360         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5361                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5362
5363         register_netdevice_notifier(&ipv6_dev_notf);
5364
5365         addrconf_verify();
5366
5367         rtnl_af_register(&inet6_ops);
5368
5369         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5370                               NULL);
5371         if (err < 0)
5372                 goto errout;
5373
5374         /* Only the first call to __rtnl_register can fail */
5375         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5376         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5377         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5378                         inet6_dump_ifaddr, NULL);
5379         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5380                         inet6_dump_ifmcaddr, NULL);
5381         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5382                         inet6_dump_ifacaddr, NULL);
5383         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5384                         inet6_netconf_dump_devconf, NULL);
5385
5386         ipv6_addr_label_rtnl_register();
5387
5388         return 0;
5389 errout:
5390         rtnl_af_unregister(&inet6_ops);
5391         unregister_netdevice_notifier(&ipv6_dev_notf);
5392 errlo:
5393         destroy_workqueue(addrconf_wq);
5394 out_nowq:
5395         unregister_pernet_subsys(&addrconf_ops);
5396 out_addrlabel:
5397         ipv6_addr_label_cleanup();
5398 out:
5399         return err;
5400 }
5401
5402 void addrconf_cleanup(void)
5403 {
5404         struct net_device *dev;
5405         int i;
5406
5407         unregister_netdevice_notifier(&ipv6_dev_notf);
5408         unregister_pernet_subsys(&addrconf_ops);
5409         ipv6_addr_label_cleanup();
5410
5411         rtnl_lock();
5412
5413         __rtnl_af_unregister(&inet6_ops);
5414
5415         /* clean dev list */
5416         for_each_netdev(&init_net, dev) {
5417                 if (__in6_dev_get(dev) == NULL)
5418                         continue;
5419                 addrconf_ifdown(dev, 1);
5420         }
5421         addrconf_ifdown(init_net.loopback_dev, 2);
5422
5423         /*
5424          *      Check hash table.
5425          */
5426         spin_lock_bh(&addrconf_hash_lock);
5427         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5428                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5429         spin_unlock_bh(&addrconf_hash_lock);
5430         cancel_delayed_work(&addr_chk_work);
5431         rtnl_unlock();
5432
5433         destroy_workqueue(addrconf_wq);
5434 }