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