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
  87 #ifdef CONFIG_IPV6_PRIVACY
  88 #include <linux/random.h>
  89 #endif
  90
  91 #include <linux/uaccess.h>
  92 #include <asm/unaligned.h>
  93
  94 #include <linux/proc_fs.h>
  95 #include <linux/seq_file.h>
  96 #include <linux/export.h>
  97
  98 /* Set to 3 to get tracing... */
  99 #define ACONF_DEBUG 2
 100
 101 #if ACONF_DEBUG >= 3
 102 #define ADBG(x) printk x
 103 #else
 104 #define ADBG(x)
 105 #endif
 106
 107 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 108
 109 static inline u32 cstamp_delta(unsigned long cstamp)
 110 {
 111         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 112 }
 113
 114 #ifdef CONFIG_SYSCTL
 115 static void addrconf_sysctl_register(struct inet6_dev *idev);
 116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 117 #else
 118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 119 {
 120 }
 121
 122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 123 {
 124 }
 125 #endif
 126
 127 #ifdef CONFIG_IPV6_PRIVACY
 128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 130 static void ipv6_regen_rndid(unsigned long data);
 131 #endif
 132
 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 134 static int ipv6_count_addresses(struct inet6_dev *idev);
 135
 136 /*
 137  *      Configured unicast address hash table
 138  */
 139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 140 static DEFINE_SPINLOCK(addrconf_hash_lock);
 141
 142 static void addrconf_verify(unsigned long);
 143
 144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 145 static DEFINE_SPINLOCK(addrconf_verify_lock);
 146
 147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 149
 150 static void addrconf_type_change(struct net_device *dev,
 151                                  unsigned long event);
 152 static int addrconf_ifdown(struct net_device *dev, int how);
 153
 154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 155                                                   int plen,
 156                                                   const struct net_device *dev,
 157                                                   u32 flags, u32 noflags);
 158
 159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 160 static void addrconf_dad_timer(unsigned long data);
 161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 162 static void addrconf_dad_run(struct inet6_dev *idev);
 163 static void addrconf_rs_timer(unsigned long data);
 164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 166
 167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 168                                 struct prefix_info *pinfo);
 169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 170                                struct net_device *dev);
 171
 172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 173         .forwarding             = 0,
 174         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 175         .mtu6                   = IPV6_MIN_MTU,
 176         .accept_ra              = 1,
 177         .accept_redirects       = 1,
 178         .autoconf               = 1,
 179         .force_mld_version      = 0,
 180         .dad_transmits          = 1,
 181         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 182         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 183         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 184 #ifdef CONFIG_IPV6_PRIVACY
 185         .use_tempaddr           = 0,
 186         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 187         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 188         .regen_max_retry        = REGEN_MAX_RETRY,
 189         .max_desync_factor      = MAX_DESYNC_FACTOR,
 190 #endif
 191         .max_addresses          = IPV6_MAX_ADDRESSES,
 192         .accept_ra_defrtr       = 1,
 193         .accept_ra_pinfo        = 1,
 194 #ifdef CONFIG_IPV6_ROUTER_PREF
 195         .accept_ra_rtr_pref     = 1,
 196         .rtr_probe_interval     = 60 * HZ,
 197 #ifdef CONFIG_IPV6_ROUTE_INFO
 198         .accept_ra_rt_info_max_plen = 0,
 199 #endif
 200 #endif
 201         .proxy_ndp              = 0,
 202         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 203         .disable_ipv6           = 0,
 204         .accept_dad             = 1,
 205 };
 206
 207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 208         .forwarding             = 0,
 209         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 210         .mtu6                   = IPV6_MIN_MTU,
 211         .accept_ra              = 1,
 212         .accept_redirects       = 1,
 213         .autoconf               = 1,
 214         .dad_transmits          = 1,
 215         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 216         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 217         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 218 #ifdef CONFIG_IPV6_PRIVACY
 219         .use_tempaddr           = 0,
 220         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 221         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 222         .regen_max_retry        = REGEN_MAX_RETRY,
 223         .max_desync_factor      = MAX_DESYNC_FACTOR,
 224 #endif
 225         .max_addresses          = IPV6_MAX_ADDRESSES,
 226         .accept_ra_defrtr       = 1,
 227         .accept_ra_pinfo        = 1,
 228 #ifdef CONFIG_IPV6_ROUTER_PREF
 229         .accept_ra_rtr_pref     = 1,
 230         .rtr_probe_interval     = 60 * HZ,
 231 #ifdef CONFIG_IPV6_ROUTE_INFO
 232         .accept_ra_rt_info_max_plen = 0,
 233 #endif
 234 #endif
 235         .proxy_ndp              = 0,
 236         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 237         .disable_ipv6           = 0,
 238         .accept_dad             = 1,
 239 };
 240
 241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
 247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
 248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
 249
 250 /* Check if a valid qdisc is available */
 251 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 252 {
 253         return !qdisc_tx_is_noop(dev);
 254 }
 255
 256 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
 257 {
 258         if (del_timer(&ifp->timer))
 259                 __in6_ifa_put(ifp);
 260 }
 261
 262 enum addrconf_timer_t {
 263         AC_NONE,
 264         AC_DAD,
 265         AC_RS,
 266 };
 267
 268 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
 269                                enum addrconf_timer_t what,
 270                                unsigned long when)
 271 {
 272         if (!del_timer(&ifp->timer))
 273                 in6_ifa_hold(ifp);
 274
 275         switch (what) {
 276         case AC_DAD:
 277                 ifp->timer.function = addrconf_dad_timer;
 278                 break;
 279         case AC_RS:
 280                 ifp->timer.function = addrconf_rs_timer;
 281                 break;
 282         default:
 283                 break;
 284         }
 285         ifp->timer.expires = jiffies + when;
 286         add_timer(&ifp->timer);
 287 }
 288
 289 static int snmp6_alloc_dev(struct inet6_dev *idev)
 290 {
 291         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 292                           sizeof(struct ipstats_mib),
 293                           __alignof__(struct ipstats_mib)) < 0)
 294                 goto err_ip;
 295         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 296                                         GFP_KERNEL);
 297         if (!idev->stats.icmpv6dev)
 298                 goto err_icmp;
 299         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 300                                            GFP_KERNEL);
 301         if (!idev->stats.icmpv6msgdev)
 302                 goto err_icmpmsg;
 303
 304         return 0;
 305
 306 err_icmpmsg:
 307         kfree(idev->stats.icmpv6dev);
 308 err_icmp:
 309         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 310 err_ip:
 311         return -ENOMEM;
 312 }
 313
 314 static void snmp6_free_dev(struct inet6_dev *idev)
 315 {
 316         kfree(idev->stats.icmpv6msgdev);
 317         kfree(idev->stats.icmpv6dev);
 318         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 319 }
 320
 321 /* Nobody refers to this device, we may destroy it. */
 322
 323 void in6_dev_finish_destroy(struct inet6_dev *idev)
 324 {
 325         struct net_device *dev = idev->dev;
 326
 327         WARN_ON(!list_empty(&idev->addr_list));
 328         WARN_ON(idev->mc_list != NULL);
 329
 330 #ifdef NET_REFCNT_DEBUG
 331         pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
 332 #endif
 333         dev_put(dev);
 334         if (!idev->dead) {
 335                 pr_warn("Freeing alive inet6 device %p\n", idev);
 336                 return;
 337         }
 338         snmp6_free_dev(idev);
 339         kfree_rcu(idev, rcu);
 340 }
 341 EXPORT_SYMBOL(in6_dev_finish_destroy);
 342
 343 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 344 {
 345         struct inet6_dev *ndev;
 346
 347         ASSERT_RTNL();
 348
 349         if (dev->mtu < IPV6_MIN_MTU)
 350                 return NULL;
 351
 352         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 353
 354         if (ndev == NULL)
 355                 return NULL;
 356
 357         rwlock_init(&ndev->lock);
 358         ndev->dev = dev;
 359         INIT_LIST_HEAD(&ndev->addr_list);
 360
 361         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 362         ndev->cnf.mtu6 = dev->mtu;
 363         ndev->cnf.sysctl = NULL;
 364         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 365         if (ndev->nd_parms == NULL) {
 366                 kfree(ndev);
 367                 return NULL;
 368         }
 369         if (ndev->cnf.forwarding)
 370                 dev_disable_lro(dev);
 371         /* We refer to the device */
 372         dev_hold(dev);
 373
 374         if (snmp6_alloc_dev(ndev) < 0) {
 375                 ADBG((KERN_WARNING
 376                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 377                         __func__, dev->name));
 378                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 379                 dev_put(dev);
 380                 kfree(ndev);
 381                 return NULL;
 382         }
 383
 384         if (snmp6_register_dev(ndev) < 0) {
 385                 ADBG((KERN_WARNING
 386                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 387                         __func__, dev->name));
 388                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 389                 ndev->dead = 1;
 390                 in6_dev_finish_destroy(ndev);
 391                 return NULL;
 392         }
 393
 394         /* One reference from device.  We must do this before
 395          * we invoke __ipv6_regen_rndid().
 396          */
 397         in6_dev_hold(ndev);
 398
 399         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 400                 ndev->cnf.accept_dad = -1;
 401
 402 #if IS_ENABLED(CONFIG_IPV6_SIT)
 403         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 404                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 405                 ndev->cnf.rtr_solicits = 0;
 406         }
 407 #endif
 408
 409 #ifdef CONFIG_IPV6_PRIVACY
 410         INIT_LIST_HEAD(&ndev->tempaddr_list);
 411         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 412         if ((dev->flags&IFF_LOOPBACK) ||
 413             dev->type == ARPHRD_TUNNEL ||
 414             dev->type == ARPHRD_TUNNEL6 ||
 415             dev->type == ARPHRD_SIT ||
 416             dev->type == ARPHRD_NONE) {
 417                 ndev->cnf.use_tempaddr = -1;
 418         } else {
 419                 in6_dev_hold(ndev);
 420                 ipv6_regen_rndid((unsigned long) ndev);
 421         }
 422 #endif
 423         ndev->token = in6addr_any;
 424
 425         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 426                 ndev->if_flags |= IF_READY;
 427
 428         ipv6_mc_init_dev(ndev);
 429         ndev->tstamp = jiffies;
 430         addrconf_sysctl_register(ndev);
 431         /* protected by rtnl_lock */
 432         rcu_assign_pointer(dev->ip6_ptr, ndev);
 433
 434         /* Join interface-local all-node multicast group */
 435         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 436
 437         /* Join all-node multicast group */
 438         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 439
 440         /* Join all-router multicast group if forwarding is set */
 441         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 442                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 443
 444         return ndev;
 445 }
 446
 447 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 448 {
 449         struct inet6_dev *idev;
 450
 451         ASSERT_RTNL();
 452
 453         idev = __in6_dev_get(dev);
 454         if (!idev) {
 455                 idev = ipv6_add_dev(dev);
 456                 if (!idev)
 457                         return NULL;
 458         }
 459
 460         if (dev->flags&IFF_UP)
 461                 ipv6_mc_up(idev);
 462         return idev;
 463 }
 464
 465 static int inet6_netconf_msgsize_devconf(int type)
 466 {
 467         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 468                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 469
 470         /* type -1 is used for ALL */
 471         if (type == -1 || type == NETCONFA_FORWARDING)
 472                 size += nla_total_size(4);
 473 #ifdef CONFIG_IPV6_MROUTE
 474         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 475                 size += nla_total_size(4);
 476 #endif
 477
 478         return size;
 479 }
 480
 481 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 482                                       struct ipv6_devconf *devconf, u32 portid,
 483                                       u32 seq, int event, unsigned int flags,
 484                                       int type)
 485 {
 486         struct nlmsghdr  *nlh;
 487         struct netconfmsg *ncm;
 488
 489         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 490                         flags);
 491         if (nlh == NULL)
 492                 return -EMSGSIZE;
 493
 494         ncm = nlmsg_data(nlh);
 495         ncm->ncm_family = AF_INET6;
 496
 497         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 498                 goto nla_put_failure;
 499
 500         /* type -1 is used for ALL */
 501         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 502             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 503                 goto nla_put_failure;
 504 #ifdef CONFIG_IPV6_MROUTE
 505         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 506             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 507                         devconf->mc_forwarding) < 0)
 508                 goto nla_put_failure;
 509 #endif
 510         return nlmsg_end(skb, nlh);
 511
 512 nla_put_failure:
 513         nlmsg_cancel(skb, nlh);
 514         return -EMSGSIZE;
 515 }
 516
 517 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 518                                   struct ipv6_devconf *devconf)
 519 {
 520         struct sk_buff *skb;
 521         int err = -ENOBUFS;
 522
 523         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 524         if (skb == NULL)
 525                 goto errout;
 526
 527         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 528                                          RTM_NEWNETCONF, 0, type);
 529         if (err < 0) {
 530                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 531                 WARN_ON(err == -EMSGSIZE);
 532                 kfree_skb(skb);
 533                 goto errout;
 534         }
 535         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 536         return;
 537 errout:
 538         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 539 }
 540
 541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 542         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 543         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 544 };
 545
 546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 547                                      struct nlmsghdr *nlh)
 548 {
 549         struct net *net = sock_net(in_skb->sk);
 550         struct nlattr *tb[NETCONFA_MAX+1];
 551         struct netconfmsg *ncm;
 552         struct sk_buff *skb;
 553         struct ipv6_devconf *devconf;
 554         struct inet6_dev *in6_dev;
 555         struct net_device *dev;
 556         int ifindex;
 557         int err;
 558
 559         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 560                           devconf_ipv6_policy);
 561         if (err < 0)
 562                 goto errout;
 563
 564         err = EINVAL;
 565         if (!tb[NETCONFA_IFINDEX])
 566                 goto errout;
 567
 568         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 569         switch (ifindex) {
 570         case NETCONFA_IFINDEX_ALL:
 571                 devconf = net->ipv6.devconf_all;
 572                 break;
 573         case NETCONFA_IFINDEX_DEFAULT:
 574                 devconf = net->ipv6.devconf_dflt;
 575                 break;
 576         default:
 577                 dev = __dev_get_by_index(net, ifindex);
 578                 if (dev == NULL)
 579                         goto errout;
 580                 in6_dev = __in6_dev_get(dev);
 581                 if (in6_dev == NULL)
 582                         goto errout;
 583                 devconf = &in6_dev->cnf;
 584                 break;
 585         }
 586
 587         err = -ENOBUFS;
 588         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 589         if (skb == NULL)
 590                 goto errout;
 591
 592         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 593                                          NETLINK_CB(in_skb).portid,
 594                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 595                                          -1);
 596         if (err < 0) {
 597                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 598                 WARN_ON(err == -EMSGSIZE);
 599                 kfree_skb(skb);
 600                 goto errout;
 601         }
 602         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 603 errout:
 604         return err;
 605 }
 606
 607 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 608                                       struct netlink_callback *cb)
 609 {
 610         struct net *net = sock_net(skb->sk);
 611         int h, s_h;
 612         int idx, s_idx;
 613         struct net_device *dev;
 614         struct inet6_dev *idev;
 615         struct hlist_head *head;
 616
 617         s_h = cb->args[0];
 618         s_idx = idx = cb->args[1];
 619
 620         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 621                 idx = 0;
 622                 head = &net->dev_index_head[h];
 623                 rcu_read_lock();
 624                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 625                           net->dev_base_seq;
 626                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 627                         if (idx < s_idx)
 628                                 goto cont;
 629                         idev = __in6_dev_get(dev);
 630                         if (!idev)
 631                                 goto cont;
 632
 633                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 634                                                        &idev->cnf,
 635                                                        NETLINK_CB(cb->skb).portid,
 636                                                        cb->nlh->nlmsg_seq,
 637                                                        RTM_NEWNETCONF,
 638                                                        NLM_F_MULTI,
 639                                                        -1) <= 0) {
 640                                 rcu_read_unlock();
 641                                 goto done;
 642                         }
 643                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 644 cont:
 645                         idx++;
 646                 }
 647                 rcu_read_unlock();
 648         }
 649         if (h == NETDEV_HASHENTRIES) {
 650                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 651                                                net->ipv6.devconf_all,
 652                                                NETLINK_CB(cb->skb).portid,
 653                                                cb->nlh->nlmsg_seq,
 654                                                RTM_NEWNETCONF, NLM_F_MULTI,
 655                                                -1) <= 0)
 656                         goto done;
 657                 else
 658                         h++;
 659         }
 660         if (h == NETDEV_HASHENTRIES + 1) {
 661                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 662                                                net->ipv6.devconf_dflt,
 663                                                NETLINK_CB(cb->skb).portid,
 664                                                cb->nlh->nlmsg_seq,
 665                                                RTM_NEWNETCONF, NLM_F_MULTI,
 666                                                -1) <= 0)
 667                         goto done;
 668                 else
 669                         h++;
 670         }
 671 done:
 672         cb->args[0] = h;
 673         cb->args[1] = idx;
 674
 675         return skb->len;
 676 }
 677
 678 #ifdef CONFIG_SYSCTL
 679 static void dev_forward_change(struct inet6_dev *idev)
 680 {
 681         struct net_device *dev;
 682         struct inet6_ifaddr *ifa;
 683
 684         if (!idev)
 685                 return;
 686         dev = idev->dev;
 687         if (idev->cnf.forwarding)
 688                 dev_disable_lro(dev);
 689         if (dev->flags & IFF_MULTICAST) {
 690                 if (idev->cnf.forwarding) {
 691                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 692                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 693                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 694                 } else {
 695                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 696                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 697                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 698                 }
 699         }
 700
 701         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 702                 if (ifa->flags&IFA_F_TENTATIVE)
 703                         continue;
 704                 if (idev->cnf.forwarding)
 705                         addrconf_join_anycast(ifa);
 706                 else
 707                         addrconf_leave_anycast(ifa);
 708         }
 709         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 710                                      dev->ifindex, &idev->cnf);
 711 }
 712
 713
 714 static void addrconf_forward_change(struct net *net, __s32 newf)
 715 {
 716         struct net_device *dev;
 717         struct inet6_dev *idev;
 718
 719         for_each_netdev(net, dev) {
 720                 idev = __in6_dev_get(dev);
 721                 if (idev) {
 722                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 723                         idev->cnf.forwarding = newf;
 724                         if (changed)
 725                                 dev_forward_change(idev);
 726                 }
 727         }
 728 }
 729
 730 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 731 {
 732         struct net *net;
 733         int old;
 734
 735         if (!rtnl_trylock())
 736                 return restart_syscall();
 737
 738         net = (struct net *)table->extra2;
 739         old = *p;
 740         *p = newf;
 741
 742         if (p == &net->ipv6.devconf_dflt->forwarding) {
 743                 if ((!newf) ^ (!old))
 744                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 745                                                      NETCONFA_IFINDEX_DEFAULT,
 746                                                      net->ipv6.devconf_dflt);
 747                 rtnl_unlock();
 748                 return 0;
 749         }
 750
 751         if (p == &net->ipv6.devconf_all->forwarding) {
 752                 net->ipv6.devconf_dflt->forwarding = newf;
 753                 addrconf_forward_change(net, newf);
 754                 if ((!newf) ^ (!old))
 755                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 756                                                      NETCONFA_IFINDEX_ALL,
 757                                                      net->ipv6.devconf_all);
 758         } else if ((!newf) ^ (!old))
 759                 dev_forward_change((struct inet6_dev *)table->extra1);
 760         rtnl_unlock();
 761
 762         if (newf)
 763                 rt6_purge_dflt_routers(net);
 764         return 1;
 765 }
 766 #endif
 767
 768 /* Nobody refers to this ifaddr, destroy it */
 769 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 770 {
 771         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 772
 773 #ifdef NET_REFCNT_DEBUG
 774         pr_debug("%s\n", __func__);
 775 #endif
 776
 777         in6_dev_put(ifp->idev);
 778
 779         if (del_timer(&ifp->timer))
 780                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 781
 782         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 783                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 784                 return;
 785         }
 786         ip6_rt_put(ifp->rt);
 787
 788         kfree_rcu(ifp, rcu);
 789 }
 790
 791 static void
 792 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 793 {
 794         struct list_head *p;
 795         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 796
 797         /*
 798          * Each device address list is sorted in order of scope -
 799          * global before linklocal.
 800          */
 801         list_for_each(p, &idev->addr_list) {
 802                 struct inet6_ifaddr *ifa
 803                         = list_entry(p, struct inet6_ifaddr, if_list);
 804                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 805                         break;
 806         }
 807
 808         list_add_tail(&ifp->if_list, p);
 809 }
 810
 811 static u32 inet6_addr_hash(const struct in6_addr *addr)
 812 {
 813         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 814 }
 815
 816 /* On success it returns ifp with increased reference count */
 817
 818 static struct inet6_ifaddr *
 819 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
 820               int scope, u32 flags)
 821 {
 822         struct inet6_ifaddr *ifa = NULL;
 823         struct rt6_info *rt;
 824         unsigned int hash;
 825         int err = 0;
 826         int addr_type = ipv6_addr_type(addr);
 827
 828         if (addr_type == IPV6_ADDR_ANY ||
 829             addr_type & IPV6_ADDR_MULTICAST ||
 830             (!(idev->dev->flags & IFF_LOOPBACK) &&
 831              addr_type & IPV6_ADDR_LOOPBACK))
 832                 return ERR_PTR(-EADDRNOTAVAIL);
 833
 834         rcu_read_lock_bh();
 835         if (idev->dead) {
 836                 err = -ENODEV;                  /*XXX*/
 837                 goto out2;
 838         }
 839
 840         if (idev->cnf.disable_ipv6) {
 841                 err = -EACCES;
 842                 goto out2;
 843         }
 844
 845         spin_lock(&addrconf_hash_lock);
 846
 847         /* Ignore adding duplicate addresses on an interface */
 848         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 849                 ADBG(("ipv6_add_addr: already assigned\n"));
 850                 err = -EEXIST;
 851                 goto out;
 852         }
 853
 854         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 855
 856         if (ifa == NULL) {
 857                 ADBG(("ipv6_add_addr: malloc failed\n"));
 858                 err = -ENOBUFS;
 859                 goto out;
 860         }
 861
 862         rt = addrconf_dst_alloc(idev, addr, false);
 863         if (IS_ERR(rt)) {
 864                 err = PTR_ERR(rt);
 865                 goto out;
 866         }
 867
 868         ifa->addr = *addr;
 869
 870         spin_lock_init(&ifa->lock);
 871         spin_lock_init(&ifa->state_lock);
 872         init_timer(&ifa->timer);
 873         INIT_HLIST_NODE(&ifa->addr_lst);
 874         ifa->timer.data = (unsigned long) ifa;
 875         ifa->scope = scope;
 876         ifa->prefix_len = pfxlen;
 877         ifa->flags = flags | IFA_F_TENTATIVE;
 878         ifa->cstamp = ifa->tstamp = jiffies;
 879         ifa->tokenized = false;
 880
 881         ifa->rt = rt;
 882
 883         ifa->idev = idev;
 884         in6_dev_hold(idev);
 885         /* For caller */
 886         in6_ifa_hold(ifa);
 887
 888         /* Add to big hash table */
 889         hash = inet6_addr_hash(addr);
 890
 891         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 892         spin_unlock(&addrconf_hash_lock);
 893
 894         write_lock(&idev->lock);
 895         /* Add to inet6_dev unicast addr list. */
 896         ipv6_link_dev_addr(idev, ifa);
 897
 898 #ifdef CONFIG_IPV6_PRIVACY
 899         if (ifa->flags&IFA_F_TEMPORARY) {
 900                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 901                 in6_ifa_hold(ifa);
 902         }
 903 #endif
 904
 905         in6_ifa_hold(ifa);
 906         write_unlock(&idev->lock);
 907 out2:
 908         rcu_read_unlock_bh();
 909
 910         if (likely(err == 0))
 911                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 912         else {
 913                 kfree(ifa);
 914                 ifa = ERR_PTR(err);
 915         }
 916
 917         return ifa;
 918 out:
 919         spin_unlock(&addrconf_hash_lock);
 920         goto out2;
 921 }
 922
 923 /* This function wants to get referenced ifp and releases it before return */
 924
 925 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 926 {
 927         struct inet6_ifaddr *ifa, *ifn;
 928         struct inet6_dev *idev = ifp->idev;
 929         int state;
 930         int deleted = 0, onlink = 0;
 931         unsigned long expires = jiffies;
 932
 933         spin_lock_bh(&ifp->state_lock);
 934         state = ifp->state;
 935         ifp->state = INET6_IFADDR_STATE_DEAD;
 936         spin_unlock_bh(&ifp->state_lock);
 937
 938         if (state == INET6_IFADDR_STATE_DEAD)
 939                 goto out;
 940
 941         spin_lock_bh(&addrconf_hash_lock);
 942         hlist_del_init_rcu(&ifp->addr_lst);
 943         spin_unlock_bh(&addrconf_hash_lock);
 944
 945         write_lock_bh(&idev->lock);
 946 #ifdef CONFIG_IPV6_PRIVACY
 947         if (ifp->flags&IFA_F_TEMPORARY) {
 948                 list_del(&ifp->tmp_list);
 949                 if (ifp->ifpub) {
 950                         in6_ifa_put(ifp->ifpub);
 951                         ifp->ifpub = NULL;
 952                 }
 953                 __in6_ifa_put(ifp);
 954         }
 955 #endif
 956
 957         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 958                 if (ifa == ifp) {
 959                         list_del_init(&ifp->if_list);
 960                         __in6_ifa_put(ifp);
 961
 962                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 963                                 break;
 964                         deleted = 1;
 965                         continue;
 966                 } else if (ifp->flags & IFA_F_PERMANENT) {
 967                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 968                                               ifp->prefix_len)) {
 969                                 if (ifa->flags & IFA_F_PERMANENT) {
 970                                         onlink = 1;
 971                                         if (deleted)
 972                                                 break;
 973                                 } else {
 974                                         unsigned long lifetime;
 975
 976                                         if (!onlink)
 977                                                 onlink = -1;
 978
 979                                         spin_lock(&ifa->lock);
 980
 981                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 982                                         /*
 983                                          * Note: Because this address is
 984                                          * not permanent, lifetime <
 985                                          * LONG_MAX / HZ here.
 986                                          */
 987                                         if (time_before(expires,
 988                                                         ifa->tstamp + lifetime * HZ))
 989                                                 expires = ifa->tstamp + lifetime * HZ;
 990                                         spin_unlock(&ifa->lock);
 991                                 }
 992                         }
 993                 }
 994         }
 995         write_unlock_bh(&idev->lock);
 996
 997         addrconf_del_timer(ifp);
 998
 999         ipv6_ifa_notify(RTM_DELADDR, ifp);
1000
1001         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1002
1003         /*
1004          * Purge or update corresponding prefix
1005          *
1006          * 1) we don't purge prefix here if address was not permanent.
1007          *    prefix is managed by its own lifetime.
1008          * 2) if there're no addresses, delete prefix.
1009          * 3) if there're still other permanent address(es),
1010          *    corresponding prefix is still permanent.
1011          * 4) otherwise, update prefix lifetime to the
1012          *    longest valid lifetime among the corresponding
1013          *    addresses on the device.
1014          *    Note: subsequent RA will update lifetime.
1015          *
1016          * --yoshfuji
1017          */
1018         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1019                 struct in6_addr prefix;
1020                 struct rt6_info *rt;
1021
1022                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1023
1024                 rt = addrconf_get_prefix_route(&prefix,
1025                                                ifp->prefix_len,
1026                                                ifp->idev->dev,
1027                                                0, RTF_GATEWAY | RTF_DEFAULT);
1028
1029                 if (rt) {
1030                         if (onlink == 0) {
1031                                 ip6_del_rt(rt);
1032                                 rt = NULL;
1033                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1034                                 rt6_set_expires(rt, expires);
1035                         }
1036                 }
1037                 ip6_rt_put(rt);
1038         }
1039
1040         /* clean up prefsrc entries */
1041         rt6_remove_prefsrc(ifp);
1042 out:
1043         in6_ifa_put(ifp);
1044 }
1045
1046 #ifdef CONFIG_IPV6_PRIVACY
1047 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1048 {
1049         struct inet6_dev *idev = ifp->idev;
1050         struct in6_addr addr, *tmpaddr;
1051         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1052         unsigned long regen_advance;
1053         int tmp_plen;
1054         int ret = 0;
1055         int max_addresses;
1056         u32 addr_flags;
1057         unsigned long now = jiffies;
1058
1059         write_lock(&idev->lock);
1060         if (ift) {
1061                 spin_lock_bh(&ift->lock);
1062                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1063                 spin_unlock_bh(&ift->lock);
1064                 tmpaddr = &addr;
1065         } else {
1066                 tmpaddr = NULL;
1067         }
1068 retry:
1069         in6_dev_hold(idev);
1070         if (idev->cnf.use_tempaddr <= 0) {
1071                 write_unlock(&idev->lock);
1072                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1073                 in6_dev_put(idev);
1074                 ret = -1;
1075                 goto out;
1076         }
1077         spin_lock_bh(&ifp->lock);
1078         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1079                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1080                 spin_unlock_bh(&ifp->lock);
1081                 write_unlock(&idev->lock);
1082                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1083                         __func__);
1084                 in6_dev_put(idev);
1085                 ret = -1;
1086                 goto out;
1087         }
1088         in6_ifa_hold(ifp);
1089         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1090         __ipv6_try_regen_rndid(idev, tmpaddr);
1091         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1092         age = (now - ifp->tstamp) / HZ;
1093         tmp_valid_lft = min_t(__u32,
1094                               ifp->valid_lft,
1095                               idev->cnf.temp_valid_lft + age);
1096         tmp_prefered_lft = min_t(__u32,
1097                                  ifp->prefered_lft,
1098                                  idev->cnf.temp_prefered_lft + age -
1099                                  idev->cnf.max_desync_factor);
1100         tmp_plen = ifp->prefix_len;
1101         max_addresses = idev->cnf.max_addresses;
1102         tmp_tstamp = ifp->tstamp;
1103         spin_unlock_bh(&ifp->lock);
1104
1105         regen_advance = idev->cnf.regen_max_retry *
1106                         idev->cnf.dad_transmits *
1107                         idev->nd_parms->retrans_time / HZ;
1108         write_unlock(&idev->lock);
1109
1110         /* A temporary address is created only if this calculated Preferred
1111          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1112          * an implementation must not create a temporary address with a zero
1113          * Preferred Lifetime.
1114          */
1115         if (tmp_prefered_lft <= regen_advance) {
1116                 in6_ifa_put(ifp);
1117                 in6_dev_put(idev);
1118                 ret = -1;
1119                 goto out;
1120         }
1121
1122         addr_flags = IFA_F_TEMPORARY;
1123         /* set in addrconf_prefix_rcv() */
1124         if (ifp->flags & IFA_F_OPTIMISTIC)
1125                 addr_flags |= IFA_F_OPTIMISTIC;
1126
1127         ift = !max_addresses ||
1128               ipv6_count_addresses(idev) < max_addresses ?
1129                 ipv6_add_addr(idev, &addr, tmp_plen, ipv6_addr_scope(&addr),
1130                               addr_flags) : NULL;
1131         if (IS_ERR_OR_NULL(ift)) {
1132                 in6_ifa_put(ifp);
1133                 in6_dev_put(idev);
1134                 pr_info("%s: retry temporary address regeneration\n", __func__);
1135                 tmpaddr = &addr;
1136                 write_lock(&idev->lock);
1137                 goto retry;
1138         }
1139
1140         spin_lock_bh(&ift->lock);
1141         ift->ifpub = ifp;
1142         ift->valid_lft = tmp_valid_lft;
1143         ift->prefered_lft = tmp_prefered_lft;
1144         ift->cstamp = now;
1145         ift->tstamp = tmp_tstamp;
1146         spin_unlock_bh(&ift->lock);
1147
1148         addrconf_dad_start(ift);
1149         in6_ifa_put(ift);
1150         in6_dev_put(idev);
1151 out:
1152         return ret;
1153 }
1154 #endif
1155
1156 /*
1157  *      Choose an appropriate source address (RFC3484)
1158  */
1159 enum {
1160         IPV6_SADDR_RULE_INIT = 0,
1161         IPV6_SADDR_RULE_LOCAL,
1162         IPV6_SADDR_RULE_SCOPE,
1163         IPV6_SADDR_RULE_PREFERRED,
1164 #ifdef CONFIG_IPV6_MIP6
1165         IPV6_SADDR_RULE_HOA,
1166 #endif
1167         IPV6_SADDR_RULE_OIF,
1168         IPV6_SADDR_RULE_LABEL,
1169 #ifdef CONFIG_IPV6_PRIVACY
1170         IPV6_SADDR_RULE_PRIVACY,
1171 #endif
1172         IPV6_SADDR_RULE_ORCHID,
1173         IPV6_SADDR_RULE_PREFIX,
1174         IPV6_SADDR_RULE_MAX
1175 };
1176
1177 struct ipv6_saddr_score {
1178         int                     rule;
1179         int                     addr_type;
1180         struct inet6_ifaddr     *ifa;
1181         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1182         int                     scopedist;
1183         int                     matchlen;
1184 };
1185
1186 struct ipv6_saddr_dst {
1187         const struct in6_addr *addr;
1188         int ifindex;
1189         int scope;
1190         int label;
1191         unsigned int prefs;
1192 };
1193
1194 static inline int ipv6_saddr_preferred(int type)
1195 {
1196         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1197                 return 1;
1198         return 0;
1199 }
1200
1201 static int ipv6_get_saddr_eval(struct net *net,
1202                                struct ipv6_saddr_score *score,
1203                                struct ipv6_saddr_dst *dst,
1204                                int i)
1205 {
1206         int ret;
1207
1208         if (i <= score->rule) {
1209                 switch (i) {
1210                 case IPV6_SADDR_RULE_SCOPE:
1211                         ret = score->scopedist;
1212                         break;
1213                 case IPV6_SADDR_RULE_PREFIX:
1214                         ret = score->matchlen;
1215                         break;
1216                 default:
1217                         ret = !!test_bit(i, score->scorebits);
1218                 }
1219                 goto out;
1220         }
1221
1222         switch (i) {
1223         case IPV6_SADDR_RULE_INIT:
1224                 /* Rule 0: remember if hiscore is not ready yet */
1225                 ret = !!score->ifa;
1226                 break;
1227         case IPV6_SADDR_RULE_LOCAL:
1228                 /* Rule 1: Prefer same address */
1229                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1230                 break;
1231         case IPV6_SADDR_RULE_SCOPE:
1232                 /* Rule 2: Prefer appropriate scope
1233                  *
1234                  *      ret
1235                  *       ^
1236                  *    -1 |  d 15
1237                  *    ---+--+-+---> scope
1238                  *       |
1239                  *       |             d is scope of the destination.
1240                  *  B-d  |  \
1241                  *       |   \      <- smaller scope is better if
1242                  *  B-15 |    \        if scope is enough for destinaion.
1243                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1244                  * d-C-1 | /
1245                  *       |/         <- greater is better
1246                  *   -C  /             if scope is not enough for destination.
1247                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1248                  *
1249                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1250                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1251                  * Assume B = 0 and we get C > 29.
1252                  */
1253                 ret = __ipv6_addr_src_scope(score->addr_type);
1254                 if (ret >= dst->scope)
1255                         ret = -ret;
1256                 else
1257                         ret -= 128;     /* 30 is enough */
1258                 score->scopedist = ret;
1259                 break;
1260         case IPV6_SADDR_RULE_PREFERRED:
1261                 /* Rule 3: Avoid deprecated and optimistic addresses */
1262                 ret = ipv6_saddr_preferred(score->addr_type) ||
1263                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1264                 break;
1265 #ifdef CONFIG_IPV6_MIP6
1266         case IPV6_SADDR_RULE_HOA:
1267             {
1268                 /* Rule 4: Prefer home address */
1269                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1270                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1271                 break;
1272             }
1273 #endif
1274         case IPV6_SADDR_RULE_OIF:
1275                 /* Rule 5: Prefer outgoing interface */
1276                 ret = (!dst->ifindex ||
1277                        dst->ifindex == score->ifa->idev->dev->ifindex);
1278                 break;
1279         case IPV6_SADDR_RULE_LABEL:
1280                 /* Rule 6: Prefer matching label */
1281                 ret = ipv6_addr_label(net,
1282                                       &score->ifa->addr, score->addr_type,
1283                                       score->ifa->idev->dev->ifindex) == dst->label;
1284                 break;
1285 #ifdef CONFIG_IPV6_PRIVACY
1286         case IPV6_SADDR_RULE_PRIVACY:
1287             {
1288                 /* Rule 7: Prefer public address
1289                  * Note: prefer temporary address if use_tempaddr >= 2
1290                  */
1291                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1292                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1293                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1294                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1295                 break;
1296             }
1297 #endif
1298         case IPV6_SADDR_RULE_ORCHID:
1299                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1300                  *          non-ORCHID vs non-ORCHID
1301                  */
1302                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1303                         ipv6_addr_orchid(dst->addr));
1304                 break;
1305         case IPV6_SADDR_RULE_PREFIX:
1306                 /* Rule 8: Use longest matching prefix */
1307                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1308                 if (ret > score->ifa->prefix_len)
1309                         ret = score->ifa->prefix_len;
1310                 score->matchlen = ret;
1311                 break;
1312         default:
1313                 ret = 0;
1314         }
1315
1316         if (ret)
1317                 __set_bit(i, score->scorebits);
1318         score->rule = i;
1319 out:
1320         return ret;
1321 }
1322
1323 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1324                        const struct in6_addr *daddr, unsigned int prefs,
1325                        struct in6_addr *saddr)
1326 {
1327         struct ipv6_saddr_score scores[2],
1328                                 *score = &scores[0], *hiscore = &scores[1];
1329         struct ipv6_saddr_dst dst;
1330         struct net_device *dev;
1331         int dst_type;
1332
1333         dst_type = __ipv6_addr_type(daddr);
1334         dst.addr = daddr;
1335         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1336         dst.scope = __ipv6_addr_src_scope(dst_type);
1337         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1338         dst.prefs = prefs;
1339
1340         hiscore->rule = -1;
1341         hiscore->ifa = NULL;
1342
1343         rcu_read_lock();
1344
1345         for_each_netdev_rcu(net, dev) {
1346                 struct inet6_dev *idev;
1347
1348                 /* Candidate Source Address (section 4)
1349                  *  - multicast and link-local destination address,
1350                  *    the set of candidate source address MUST only
1351                  *    include addresses assigned to interfaces
1352                  *    belonging to the same link as the outgoing
1353                  *    interface.
1354                  * (- For site-local destination addresses, the
1355                  *    set of candidate source addresses MUST only
1356                  *    include addresses assigned to interfaces
1357                  *    belonging to the same site as the outgoing
1358                  *    interface.)
1359                  */
1360                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1361                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1362                     dst.ifindex && dev->ifindex != dst.ifindex)
1363                         continue;
1364
1365                 idev = __in6_dev_get(dev);
1366                 if (!idev)
1367                         continue;
1368
1369                 read_lock_bh(&idev->lock);
1370                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1371                         int i;
1372
1373                         /*
1374                          * - Tentative Address (RFC2462 section 5.4)
1375                          *  - A tentative address is not considered
1376                          *    "assigned to an interface" in the traditional
1377                          *    sense, unless it is also flagged as optimistic.
1378                          * - Candidate Source Address (section 4)
1379                          *  - In any case, anycast addresses, multicast
1380                          *    addresses, and the unspecified address MUST
1381                          *    NOT be included in a candidate set.
1382                          */
1383                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1384                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1385                                 continue;
1386
1387                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1388
1389                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1390                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1391                                 LIMIT_NETDEBUG(KERN_DEBUG
1392                                                "ADDRCONF: unspecified / multicast address "
1393                                                "assigned as unicast address on %s",
1394                                                dev->name);
1395                                 continue;
1396                         }
1397
1398                         score->rule = -1;
1399                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1400
1401                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1402                                 int minihiscore, miniscore;
1403
1404                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1405                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1406
1407                                 if (minihiscore > miniscore) {
1408                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1409                                             score->scopedist > 0) {
1410                                                 /*
1411                                                  * special case:
1412                                                  * each remaining entry
1413                                                  * has too small (not enough)
1414                                                  * scope, because ifa entries
1415                                                  * are sorted by their scope
1416                                                  * values.
1417                                                  */
1418                                                 goto try_nextdev;
1419                                         }
1420                                         break;
1421                                 } else if (minihiscore < miniscore) {
1422                                         if (hiscore->ifa)
1423                                                 in6_ifa_put(hiscore->ifa);
1424
1425                                         in6_ifa_hold(score->ifa);
1426
1427                                         swap(hiscore, score);
1428
1429                                         /* restore our iterator */
1430                                         score->ifa = hiscore->ifa;
1431
1432                                         break;
1433                                 }
1434                         }
1435                 }
1436 try_nextdev:
1437                 read_unlock_bh(&idev->lock);
1438         }
1439         rcu_read_unlock();
1440
1441         if (!hiscore->ifa)
1442                 return -EADDRNOTAVAIL;
1443
1444         *saddr = hiscore->ifa->addr;
1445         in6_ifa_put(hiscore->ifa);
1446         return 0;
1447 }
1448 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1449
1450 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1451                     unsigned char banned_flags)
1452 {
1453         struct inet6_dev *idev;
1454         int err = -EADDRNOTAVAIL;
1455
1456         rcu_read_lock();
1457         idev = __in6_dev_get(dev);
1458         if (idev) {
1459                 struct inet6_ifaddr *ifp;
1460
1461                 read_lock_bh(&idev->lock);
1462                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1463                         if (ifp->scope == IFA_LINK &&
1464                             !(ifp->flags & banned_flags)) {
1465                                 *addr = ifp->addr;
1466                                 err = 0;
1467                                 break;
1468                         }
1469                 }
1470                 read_unlock_bh(&idev->lock);
1471         }
1472         rcu_read_unlock();
1473         return err;
1474 }
1475
1476 static int ipv6_count_addresses(struct inet6_dev *idev)
1477 {
1478         int cnt = 0;
1479         struct inet6_ifaddr *ifp;
1480
1481         read_lock_bh(&idev->lock);
1482         list_for_each_entry(ifp, &idev->addr_list, if_list)
1483                 cnt++;
1484         read_unlock_bh(&idev->lock);
1485         return cnt;
1486 }
1487
1488 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1489                   const struct net_device *dev, int strict)
1490 {
1491         struct inet6_ifaddr *ifp;
1492         unsigned int hash = inet6_addr_hash(addr);
1493
1494         rcu_read_lock_bh();
1495         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1496                 if (!net_eq(dev_net(ifp->idev->dev), net))
1497                         continue;
1498                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1499                     !(ifp->flags&IFA_F_TENTATIVE) &&
1500                     (dev == NULL || ifp->idev->dev == dev ||
1501                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1502                         rcu_read_unlock_bh();
1503                         return 1;
1504                 }
1505         }
1506
1507         rcu_read_unlock_bh();
1508         return 0;
1509 }
1510 EXPORT_SYMBOL(ipv6_chk_addr);
1511
1512 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1513                                struct net_device *dev)
1514 {
1515         unsigned int hash = inet6_addr_hash(addr);
1516         struct inet6_ifaddr *ifp;
1517
1518         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1519                 if (!net_eq(dev_net(ifp->idev->dev), net))
1520                         continue;
1521                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1522                         if (dev == NULL || ifp->idev->dev == dev)
1523                                 return true;
1524                 }
1525         }
1526         return false;
1527 }
1528
1529 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1530 {
1531         struct inet6_dev *idev;
1532         struct inet6_ifaddr *ifa;
1533         int     onlink;
1534
1535         onlink = 0;
1536         rcu_read_lock();
1537         idev = __in6_dev_get(dev);
1538         if (idev) {
1539                 read_lock_bh(&idev->lock);
1540                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1541                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1542                                                    ifa->prefix_len);
1543                         if (onlink)
1544                                 break;
1545                 }
1546                 read_unlock_bh(&idev->lock);
1547         }
1548         rcu_read_unlock();
1549         return onlink;
1550 }
1551 EXPORT_SYMBOL(ipv6_chk_prefix);
1552
1553 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1554                                      struct net_device *dev, int strict)
1555 {
1556         struct inet6_ifaddr *ifp, *result = NULL;
1557         unsigned int hash = inet6_addr_hash(addr);
1558
1559         rcu_read_lock_bh();
1560         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1561                 if (!net_eq(dev_net(ifp->idev->dev), net))
1562                         continue;
1563                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1564                         if (dev == NULL || ifp->idev->dev == dev ||
1565                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1566                                 result = ifp;
1567                                 in6_ifa_hold(ifp);
1568                                 break;
1569                         }
1570                 }
1571         }
1572         rcu_read_unlock_bh();
1573
1574         return result;
1575 }
1576
1577 /* Gets referenced address, destroys ifaddr */
1578
1579 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1580 {
1581         if (ifp->flags&IFA_F_PERMANENT) {
1582                 spin_lock_bh(&ifp->lock);
1583                 addrconf_del_timer(ifp);
1584                 ifp->flags |= IFA_F_TENTATIVE;
1585                 if (dad_failed)
1586                         ifp->flags |= IFA_F_DADFAILED;
1587                 spin_unlock_bh(&ifp->lock);
1588                 if (dad_failed)
1589                         ipv6_ifa_notify(0, ifp);
1590                 in6_ifa_put(ifp);
1591 #ifdef CONFIG_IPV6_PRIVACY
1592         } else if (ifp->flags&IFA_F_TEMPORARY) {
1593                 struct inet6_ifaddr *ifpub;
1594                 spin_lock_bh(&ifp->lock);
1595                 ifpub = ifp->ifpub;
1596                 if (ifpub) {
1597                         in6_ifa_hold(ifpub);
1598                         spin_unlock_bh(&ifp->lock);
1599                         ipv6_create_tempaddr(ifpub, ifp);
1600                         in6_ifa_put(ifpub);
1601                 } else {
1602                         spin_unlock_bh(&ifp->lock);
1603                 }
1604                 ipv6_del_addr(ifp);
1605 #endif
1606         } else
1607                 ipv6_del_addr(ifp);
1608 }
1609
1610 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1611 {
1612         int err = -ENOENT;
1613
1614         spin_lock(&ifp->state_lock);
1615         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1616                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1617                 err = 0;
1618         }
1619         spin_unlock(&ifp->state_lock);
1620
1621         return err;
1622 }
1623
1624 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1625 {
1626         struct inet6_dev *idev = ifp->idev;
1627
1628         if (addrconf_dad_end(ifp)) {
1629                 in6_ifa_put(ifp);
1630                 return;
1631         }
1632
1633         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1634                              ifp->idev->dev->name, &ifp->addr);
1635
1636         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1637                 struct in6_addr addr;
1638
1639                 addr.s6_addr32[0] = htonl(0xfe800000);
1640                 addr.s6_addr32[1] = 0;
1641
1642                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1643                     ipv6_addr_equal(&ifp->addr, &addr)) {
1644                         /* DAD failed for link-local based on MAC address */
1645                         idev->cnf.disable_ipv6 = 1;
1646
1647                         pr_info("%s: IPv6 being disabled!\n",
1648                                 ifp->idev->dev->name);
1649                 }
1650         }
1651
1652         addrconf_dad_stop(ifp, 1);
1653 }
1654
1655 /* Join to solicited addr multicast group. */
1656
1657 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1658 {
1659         struct in6_addr maddr;
1660
1661         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1662                 return;
1663
1664         addrconf_addr_solict_mult(addr, &maddr);
1665         ipv6_dev_mc_inc(dev, &maddr);
1666 }
1667
1668 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1669 {
1670         struct in6_addr maddr;
1671
1672         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1673                 return;
1674
1675         addrconf_addr_solict_mult(addr, &maddr);
1676         __ipv6_dev_mc_dec(idev, &maddr);
1677 }
1678
1679 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1680 {
1681         struct in6_addr addr;
1682         if (ifp->prefix_len == 127) /* RFC 6164 */
1683                 return;
1684         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1685         if (ipv6_addr_any(&addr))
1686                 return;
1687         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1688 }
1689
1690 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1691 {
1692         struct in6_addr addr;
1693         if (ifp->prefix_len == 127) /* RFC 6164 */
1694                 return;
1695         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1696         if (ipv6_addr_any(&addr))
1697                 return;
1698         __ipv6_dev_ac_dec(ifp->idev, &addr);
1699 }
1700
1701 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1702 {
1703         if (dev->addr_len != ETH_ALEN)
1704                 return -1;
1705         memcpy(eui, dev->dev_addr, 3);
1706         memcpy(eui + 5, dev->dev_addr + 3, 3);
1707
1708         /*
1709          * The zSeries OSA network cards can be shared among various
1710          * OS instances, but the OSA cards have only one MAC address.
1711          * This leads to duplicate address conflicts in conjunction
1712          * with IPv6 if more than one instance uses the same card.
1713          *
1714          * The driver for these cards can deliver a unique 16-bit
1715          * identifier for each instance sharing the same card.  It is
1716          * placed instead of 0xFFFE in the interface identifier.  The
1717          * "u" bit of the interface identifier is not inverted in this
1718          * case.  Hence the resulting interface identifier has local
1719          * scope according to RFC2373.
1720          */
1721         if (dev->dev_id) {
1722                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1723                 eui[4] = dev->dev_id & 0xFF;
1724         } else {
1725                 eui[3] = 0xFF;
1726                 eui[4] = 0xFE;
1727                 eui[0] ^= 2;
1728         }
1729         return 0;
1730 }
1731
1732 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1733 {
1734         if (dev->addr_len != IEEE802154_ADDR_LEN)
1735                 return -1;
1736         memcpy(eui, dev->dev_addr, 8);
1737         eui[0] ^= 2;
1738         return 0;
1739 }
1740
1741 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1742 {
1743         union fwnet_hwaddr *ha;
1744
1745         if (dev->addr_len != FWNET_ALEN)
1746                 return -1;
1747
1748         ha = (union fwnet_hwaddr *)dev->dev_addr;
1749
1750         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1751         eui[0] ^= 2;
1752         return 0;
1753 }
1754
1755 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1756 {
1757         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1758         if (dev->addr_len != ARCNET_ALEN)
1759                 return -1;
1760         memset(eui, 0, 7);
1761         eui[7] = *(u8 *)dev->dev_addr;
1762         return 0;
1763 }
1764
1765 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1766 {
1767         if (dev->addr_len != INFINIBAND_ALEN)
1768                 return -1;
1769         memcpy(eui, dev->dev_addr + 12, 8);
1770         eui[0] |= 2;
1771         return 0;
1772 }
1773
1774 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1775 {
1776         if (addr == 0)
1777                 return -1;
1778         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1779                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1780                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1781                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1782                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1783                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1784         eui[1] = 0;
1785         eui[2] = 0x5E;
1786         eui[3] = 0xFE;
1787         memcpy(eui + 4, &addr, 4);
1788         return 0;
1789 }
1790
1791 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1792 {
1793         if (dev->priv_flags & IFF_ISATAP)
1794                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1795         return -1;
1796 }
1797
1798 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1799 {
1800         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1801 }
1802
1803 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1804 {
1805         switch (dev->type) {
1806         case ARPHRD_ETHER:
1807         case ARPHRD_FDDI:
1808                 return addrconf_ifid_eui48(eui, dev);
1809         case ARPHRD_ARCNET:
1810                 return addrconf_ifid_arcnet(eui, dev);
1811         case ARPHRD_INFINIBAND:
1812                 return addrconf_ifid_infiniband(eui, dev);
1813         case ARPHRD_SIT:
1814                 return addrconf_ifid_sit(eui, dev);
1815         case ARPHRD_IPGRE:
1816                 return addrconf_ifid_gre(eui, dev);
1817         case ARPHRD_IEEE802154:
1818                 return addrconf_ifid_eui64(eui, dev);
1819         case ARPHRD_IEEE1394:
1820                 return addrconf_ifid_ieee1394(eui, dev);
1821         }
1822         return -1;
1823 }
1824
1825 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1826 {
1827         int err = -1;
1828         struct inet6_ifaddr *ifp;
1829
1830         read_lock_bh(&idev->lock);
1831         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1832                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1833                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1834                         err = 0;
1835                         break;
1836                 }
1837         }
1838         read_unlock_bh(&idev->lock);
1839         return err;
1840 }
1841
1842 #ifdef CONFIG_IPV6_PRIVACY
1843 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1844 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1845 {
1846 regen:
1847         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1848         idev->rndid[0] &= ~0x02;
1849
1850         /*
1851          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1852          * check if generated address is not inappropriate
1853          *
1854          *  - Reserved subnet anycast (RFC 2526)
1855          *      11111101 11....11 1xxxxxxx
1856          *  - ISATAP (RFC4214) 6.1
1857          *      00-00-5E-FE-xx-xx-xx-xx
1858          *  - value 0
1859          *  - XXX: already assigned to an address on the device
1860          */
1861         if (idev->rndid[0] == 0xfd &&
1862             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1863             (idev->rndid[7]&0x80))
1864                 goto regen;
1865         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1866                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1867                         goto regen;
1868                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1869                         goto regen;
1870         }
1871 }
1872
1873 static void ipv6_regen_rndid(unsigned long data)
1874 {
1875         struct inet6_dev *idev = (struct inet6_dev *) data;
1876         unsigned long expires;
1877
1878         rcu_read_lock_bh();
1879         write_lock_bh(&idev->lock);
1880
1881         if (idev->dead)
1882                 goto out;
1883
1884         __ipv6_regen_rndid(idev);
1885
1886         expires = jiffies +
1887                 idev->cnf.temp_prefered_lft * HZ -
1888                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1889                 idev->cnf.max_desync_factor * HZ;
1890         if (time_before(expires, jiffies)) {
1891                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1892                         __func__, idev->dev->name);
1893                 goto out;
1894         }
1895
1896         if (!mod_timer(&idev->regen_timer, expires))
1897                 in6_dev_hold(idev);
1898
1899 out:
1900         write_unlock_bh(&idev->lock);
1901         rcu_read_unlock_bh();
1902         in6_dev_put(idev);
1903 }
1904
1905 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1906 {
1907         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1908                 __ipv6_regen_rndid(idev);
1909 }
1910 #endif
1911
1912 /*
1913  *      Add prefix route.
1914  */
1915
1916 static void
1917 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1918                       unsigned long expires, u32 flags)
1919 {
1920         struct fib6_config cfg = {
1921                 .fc_table = RT6_TABLE_PREFIX,
1922                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1923                 .fc_ifindex = dev->ifindex,
1924                 .fc_expires = expires,
1925                 .fc_dst_len = plen,
1926                 .fc_flags = RTF_UP | flags,
1927                 .fc_nlinfo.nl_net = dev_net(dev),
1928                 .fc_protocol = RTPROT_KERNEL,
1929         };
1930
1931         cfg.fc_dst = *pfx;
1932
1933         /* Prevent useless cloning on PtP SIT.
1934            This thing is done here expecting that the whole
1935            class of non-broadcast devices need not cloning.
1936          */
1937 #if IS_ENABLED(CONFIG_IPV6_SIT)
1938         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1939                 cfg.fc_flags |= RTF_NONEXTHOP;
1940 #endif
1941
1942         ip6_route_add(&cfg);
1943 }
1944
1945
1946 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1947                                                   int plen,
1948                                                   const struct net_device *dev,
1949                                                   u32 flags, u32 noflags)
1950 {
1951         struct fib6_node *fn;
1952         struct rt6_info *rt = NULL;
1953         struct fib6_table *table;
1954
1955         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1956         if (table == NULL)
1957                 return NULL;
1958
1959         read_lock_bh(&table->tb6_lock);
1960         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1961         if (!fn)
1962                 goto out;
1963         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1964                 if (rt->dst.dev->ifindex != dev->ifindex)
1965                         continue;
1966                 if ((rt->rt6i_flags & flags) != flags)
1967                         continue;
1968                 if ((rt->rt6i_flags & noflags) != 0)
1969                         continue;
1970                 dst_hold(&rt->dst);
1971                 break;
1972         }
1973 out:
1974         read_unlock_bh(&table->tb6_lock);
1975         return rt;
1976 }
1977
1978
1979 /* Create "default" multicast route to the interface */
1980
1981 static void addrconf_add_mroute(struct net_device *dev)
1982 {
1983         struct fib6_config cfg = {
1984                 .fc_table = RT6_TABLE_LOCAL,
1985                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1986                 .fc_ifindex = dev->ifindex,
1987                 .fc_dst_len = 8,
1988                 .fc_flags = RTF_UP,
1989                 .fc_nlinfo.nl_net = dev_net(dev),
1990         };
1991
1992         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1993
1994         ip6_route_add(&cfg);
1995 }
1996
1997 #if IS_ENABLED(CONFIG_IPV6_SIT)
1998 static void sit_route_add(struct net_device *dev)
1999 {
2000         struct fib6_config cfg = {
2001                 .fc_table = RT6_TABLE_MAIN,
2002                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2003                 .fc_ifindex = dev->ifindex,
2004                 .fc_dst_len = 96,
2005                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2006                 .fc_nlinfo.nl_net = dev_net(dev),
2007         };
2008
2009         /* prefix length - 96 bits "::d.d.d.d" */
2010         ip6_route_add(&cfg);
2011 }
2012 #endif
2013
2014 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2015 {
2016         struct inet6_dev *idev;
2017
2018         ASSERT_RTNL();
2019
2020         idev = ipv6_find_idev(dev);
2021         if (!idev)
2022                 return ERR_PTR(-ENOBUFS);
2023
2024         if (idev->cnf.disable_ipv6)
2025                 return ERR_PTR(-EACCES);
2026
2027         /* Add default multicast route */
2028         if (!(dev->flags & IFF_LOOPBACK))
2029                 addrconf_add_mroute(dev);
2030
2031         return idev;
2032 }
2033
2034 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2035 {
2036         struct prefix_info *pinfo;
2037         __u32 valid_lft;
2038         __u32 prefered_lft;
2039         int addr_type;
2040         struct inet6_dev *in6_dev;
2041         struct net *net = dev_net(dev);
2042
2043         pinfo = (struct prefix_info *) opt;
2044
2045         if (len < sizeof(struct prefix_info)) {
2046                 ADBG(("addrconf: prefix option too short\n"));
2047                 return;
2048         }
2049
2050         /*
2051          *      Validation checks ([ADDRCONF], page 19)
2052          */
2053
2054         addr_type = ipv6_addr_type(&pinfo->prefix);
2055
2056         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2057                 return;
2058
2059         valid_lft = ntohl(pinfo->valid);
2060         prefered_lft = ntohl(pinfo->prefered);
2061
2062         if (prefered_lft > valid_lft) {
2063                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2064                 return;
2065         }
2066
2067         in6_dev = in6_dev_get(dev);
2068
2069         if (in6_dev == NULL) {
2070                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2071                                     dev->name);
2072                 return;
2073         }
2074
2075         /*
2076          *      Two things going on here:
2077          *      1) Add routes for on-link prefixes
2078          *      2) Configure prefixes with the auto flag set
2079          */
2080
2081         if (pinfo->onlink) {
2082                 struct rt6_info *rt;
2083                 unsigned long rt_expires;
2084
2085                 /* Avoid arithmetic overflow. Really, we could
2086                  * save rt_expires in seconds, likely valid_lft,
2087                  * but it would require division in fib gc, that it
2088                  * not good.
2089                  */
2090                 if (HZ > USER_HZ)
2091                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2092                 else
2093                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2094
2095                 if (addrconf_finite_timeout(rt_expires))
2096                         rt_expires *= HZ;
2097
2098                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2099                                                pinfo->prefix_len,
2100                                                dev,
2101                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2102                                                RTF_GATEWAY | RTF_DEFAULT);
2103
2104                 if (rt) {
2105                         /* Autoconf prefix route */
2106                         if (valid_lft == 0) {
2107                                 ip6_del_rt(rt);
2108                                 rt = NULL;
2109                         } else if (addrconf_finite_timeout(rt_expires)) {
2110                                 /* not infinity */
2111                                 rt6_set_expires(rt, jiffies + rt_expires);
2112                         } else {
2113                                 rt6_clean_expires(rt);
2114                         }
2115                 } else if (valid_lft) {
2116                         clock_t expires = 0;
2117                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2118                         if (addrconf_finite_timeout(rt_expires)) {
2119                                 /* not infinity */
2120                                 flags |= RTF_EXPIRES;
2121                                 expires = jiffies_to_clock_t(rt_expires);
2122                         }
2123                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2124                                               dev, expires, flags);
2125                 }
2126                 ip6_rt_put(rt);
2127         }
2128
2129         /* Try to figure out our local address for this prefix */
2130
2131         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2132                 struct inet6_ifaddr *ifp;
2133                 struct in6_addr addr;
2134                 int create = 0, update_lft = 0;
2135                 bool tokenized = false;
2136
2137                 if (pinfo->prefix_len == 64) {
2138                         memcpy(&addr, &pinfo->prefix, 8);
2139
2140                         if (!ipv6_addr_any(&in6_dev->token)) {
2141                                 read_lock_bh(&in6_dev->lock);
2142                                 memcpy(addr.s6_addr + 8,
2143                                        in6_dev->token.s6_addr + 8, 8);
2144                                 read_unlock_bh(&in6_dev->lock);
2145                                 tokenized = true;
2146                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2147                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2148                                 in6_dev_put(in6_dev);
2149                                 return;
2150                         }
2151                         goto ok;
2152                 }
2153                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2154                                     pinfo->prefix_len);
2155                 in6_dev_put(in6_dev);
2156                 return;
2157
2158 ok:
2159
2160                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2161
2162                 if (ifp == NULL && valid_lft) {
2163                         int max_addresses = in6_dev->cnf.max_addresses;
2164                         u32 addr_flags = 0;
2165
2166 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2167                         if (in6_dev->cnf.optimistic_dad &&
2168                             !net->ipv6.devconf_all->forwarding && sllao)
2169                                 addr_flags = IFA_F_OPTIMISTIC;
2170 #endif
2171
2172                         /* Do not allow to create too much of autoconfigured
2173                          * addresses; this would be too easy way to crash kernel.
2174                          */
2175                         if (!max_addresses ||
2176                             ipv6_count_addresses(in6_dev) < max_addresses)
2177                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2178                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2179                                                     addr_flags);
2180
2181                         if (IS_ERR_OR_NULL(ifp)) {
2182                                 in6_dev_put(in6_dev);
2183                                 return;
2184                         }
2185
2186                         update_lft = create = 1;
2187                         ifp->cstamp = jiffies;
2188                         ifp->tokenized = tokenized;
2189                         addrconf_dad_start(ifp);
2190                 }
2191
2192                 if (ifp) {
2193                         int flags;
2194                         unsigned long now;
2195 #ifdef CONFIG_IPV6_PRIVACY
2196                         struct inet6_ifaddr *ift;
2197 #endif
2198                         u32 stored_lft;
2199
2200                         /* update lifetime (RFC2462 5.5.3 e) */
2201                         spin_lock(&ifp->lock);
2202                         now = jiffies;
2203                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2204                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2205                         else
2206                                 stored_lft = 0;
2207                         if (!update_lft && stored_lft) {
2208                                 if (valid_lft > MIN_VALID_LIFETIME ||
2209                                     valid_lft > stored_lft)
2210                                         update_lft = 1;
2211                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
2212                                         /* valid_lft <= stored_lft is always true */
2213                                         /*
2214                                          * RFC 4862 Section 5.5.3e:
2215                                          * "Note that the preferred lifetime of
2216                                          *  the corresponding address is always
2217                                          *  reset to the Preferred Lifetime in
2218                                          *  the received Prefix Information
2219                                          *  option, regardless of whether the
2220                                          *  valid lifetime is also reset or
2221                                          *  ignored."
2222                                          *
2223                                          *  So if the preferred lifetime in
2224                                          *  this advertisement is different
2225                                          *  than what we have stored, but the
2226                                          *  valid lifetime is invalid, just
2227                                          *  reset prefered_lft.
2228                                          *
2229                                          *  We must set the valid lifetime
2230                                          *  to the stored lifetime since we'll
2231                                          *  be updating the timestamp below,
2232                                          *  else we'll set it back to the
2233                                          *  minimum.
2234                                          */
2235                                         if (prefered_lft != ifp->prefered_lft) {
2236                                                 valid_lft = stored_lft;
2237                                                 update_lft = 1;
2238                                         }
2239                                 } else {
2240                                         valid_lft = MIN_VALID_LIFETIME;
2241                                         if (valid_lft < prefered_lft)
2242                                                 prefered_lft = valid_lft;
2243                                         update_lft = 1;
2244                                 }
2245                         }
2246
2247                         if (update_lft) {
2248                                 ifp->valid_lft = valid_lft;
2249                                 ifp->prefered_lft = prefered_lft;
2250                                 ifp->tstamp = now;
2251                                 flags = ifp->flags;
2252                                 ifp->flags &= ~IFA_F_DEPRECATED;
2253                                 spin_unlock(&ifp->lock);
2254
2255                                 if (!(flags&IFA_F_TENTATIVE))
2256                                         ipv6_ifa_notify(0, ifp);
2257                         } else
2258                                 spin_unlock(&ifp->lock);
2259
2260 #ifdef CONFIG_IPV6_PRIVACY
2261                         read_lock_bh(&in6_dev->lock);
2262                         /* update all temporary addresses in the list */
2263                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2264                                             tmp_list) {
2265                                 int age, max_valid, max_prefered;
2266
2267                                 if (ifp != ift->ifpub)
2268                                         continue;
2269
2270                                 /*
2271                                  * RFC 4941 section 3.3:
2272                                  * If a received option will extend the lifetime
2273                                  * of a public address, the lifetimes of
2274                                  * temporary addresses should be extended,
2275                                  * subject to the overall constraint that no
2276                                  * temporary addresses should ever remain
2277                                  * "valid" or "preferred" for a time longer than
2278                                  * (TEMP_VALID_LIFETIME) or
2279                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2280                                  * respectively.
2281                                  */
2282                                 age = (now - ift->cstamp) / HZ;
2283                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2284                                 if (max_valid < 0)
2285                                         max_valid = 0;
2286
2287                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2288                                                in6_dev->cnf.max_desync_factor -
2289                                                age;
2290                                 if (max_prefered < 0)
2291                                         max_prefered = 0;
2292
2293                                 if (valid_lft > max_valid)
2294                                         valid_lft = max_valid;
2295
2296                                 if (prefered_lft > max_prefered)
2297                                         prefered_lft = max_prefered;
2298
2299                                 spin_lock(&ift->lock);
2300                                 flags = ift->flags;
2301                                 ift->valid_lft = valid_lft;
2302                                 ift->prefered_lft = prefered_lft;
2303                                 ift->tstamp = now;
2304                                 if (prefered_lft > 0)
2305                                         ift->flags &= ~IFA_F_DEPRECATED;
2306
2307                                 spin_unlock(&ift->lock);
2308                                 if (!(flags&IFA_F_TENTATIVE))
2309                                         ipv6_ifa_notify(0, ift);
2310                         }
2311
2312                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2313                                 /*
2314                                  * When a new public address is created as
2315                                  * described in [ADDRCONF], also create a new
2316                                  * temporary address. Also create a temporary
2317                                  * address if it's enabled but no temporary
2318                                  * address currently exists.
2319                                  */
2320                                 read_unlock_bh(&in6_dev->lock);
2321                                 ipv6_create_tempaddr(ifp, NULL);
2322                         } else {
2323                                 read_unlock_bh(&in6_dev->lock);
2324                         }
2325 #endif
2326                         in6_ifa_put(ifp);
2327                         addrconf_verify(0);
2328                 }
2329         }
2330         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2331         in6_dev_put(in6_dev);
2332 }
2333
2334 /*
2335  *      Set destination address.
2336  *      Special case for SIT interfaces where we create a new "virtual"
2337  *      device.
2338  */
2339 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2340 {
2341         struct in6_ifreq ireq;
2342         struct net_device *dev;
2343         int err = -EINVAL;
2344
2345         rtnl_lock();
2346
2347         err = -EFAULT;
2348         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2349                 goto err_exit;
2350
2351         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2352
2353         err = -ENODEV;
2354         if (dev == NULL)
2355                 goto err_exit;
2356
2357 #if IS_ENABLED(CONFIG_IPV6_SIT)
2358         if (dev->type == ARPHRD_SIT) {
2359                 const struct net_device_ops *ops = dev->netdev_ops;
2360                 struct ifreq ifr;
2361                 struct ip_tunnel_parm p;
2362
2363                 err = -EADDRNOTAVAIL;
2364                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2365                         goto err_exit;
2366
2367                 memset(&p, 0, sizeof(p));
2368                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2369                 p.iph.saddr = 0;
2370                 p.iph.version = 4;
2371                 p.iph.ihl = 5;
2372                 p.iph.protocol = IPPROTO_IPV6;
2373                 p.iph.ttl = 64;
2374                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2375
2376                 if (ops->ndo_do_ioctl) {
2377                         mm_segment_t oldfs = get_fs();
2378
2379                         set_fs(KERNEL_DS);
2380                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2381                         set_fs(oldfs);
2382                 } else
2383                         err = -EOPNOTSUPP;
2384
2385                 if (err == 0) {
2386                         err = -ENOBUFS;
2387                         dev = __dev_get_by_name(net, p.name);
2388                         if (!dev)
2389                                 goto err_exit;
2390                         err = dev_open(dev);
2391                 }
2392         }
2393 #endif
2394
2395 err_exit:
2396         rtnl_unlock();
2397         return err;
2398 }
2399
2400 /*
2401  *      Manual configuration of address on an interface
2402  */
2403 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2404                           const struct in6_addr *peer_pfx,
2405                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2406                           __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         dev = __dev_get_by_index(net, ifindex);
2426         if (!dev)
2427                 return -ENODEV;
2428
2429         idev = addrconf_add_dev(dev);
2430         if (IS_ERR(idev))
2431                 return PTR_ERR(idev);
2432
2433         scope = ipv6_addr_scope(pfx);
2434
2435         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2436         if (addrconf_finite_timeout(timeout)) {
2437                 expires = jiffies_to_clock_t(timeout * HZ);
2438                 valid_lft = timeout;
2439                 flags = RTF_EXPIRES;
2440         } else {
2441                 expires = 0;
2442                 flags = 0;
2443                 ifa_flags |= IFA_F_PERMANENT;
2444         }
2445
2446         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2447         if (addrconf_finite_timeout(timeout)) {
2448                 if (timeout == 0)
2449                         ifa_flags |= IFA_F_DEPRECATED;
2450                 prefered_lft = timeout;
2451         }
2452
2453         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2454
2455         if (!IS_ERR(ifp)) {
2456                 spin_lock_bh(&ifp->lock);
2457                 ifp->valid_lft = valid_lft;
2458                 ifp->prefered_lft = prefered_lft;
2459                 ifp->tstamp = jiffies;
2460                 if (peer_pfx)
2461                         ifp->peer_addr = *peer_pfx;
2462                 spin_unlock_bh(&ifp->lock);
2463
2464                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2465                                       expires, flags);
2466                 /*
2467                  * Note that section 3.1 of RFC 4429 indicates
2468                  * that the Optimistic flag should not be set for
2469                  * manually configured addresses
2470                  */
2471                 addrconf_dad_start(ifp);
2472                 in6_ifa_put(ifp);
2473                 addrconf_verify(0);
2474                 return 0;
2475         }
2476
2477         return PTR_ERR(ifp);
2478 }
2479
2480 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2481                           unsigned int plen)
2482 {
2483         struct inet6_ifaddr *ifp;
2484         struct inet6_dev *idev;
2485         struct net_device *dev;
2486
2487         if (plen > 128)
2488                 return -EINVAL;
2489
2490         dev = __dev_get_by_index(net, ifindex);
2491         if (!dev)
2492                 return -ENODEV;
2493
2494         if ((idev = __in6_dev_get(dev)) == NULL)
2495                 return -ENXIO;
2496
2497         read_lock_bh(&idev->lock);
2498         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2499                 if (ifp->prefix_len == plen &&
2500                     ipv6_addr_equal(pfx, &ifp->addr)) {
2501                         in6_ifa_hold(ifp);
2502                         read_unlock_bh(&idev->lock);
2503
2504                         ipv6_del_addr(ifp);
2505
2506                         /* If the last address is deleted administratively,
2507                            disable IPv6 on this interface.
2508                          */
2509                         if (list_empty(&idev->addr_list))
2510                                 addrconf_ifdown(idev->dev, 1);
2511                         return 0;
2512                 }
2513         }
2514         read_unlock_bh(&idev->lock);
2515         return -EADDRNOTAVAIL;
2516 }
2517
2518
2519 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2520 {
2521         struct in6_ifreq ireq;
2522         int err;
2523
2524         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2525                 return -EPERM;
2526
2527         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2528                 return -EFAULT;
2529
2530         rtnl_lock();
2531         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2532                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2533                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2534         rtnl_unlock();
2535         return err;
2536 }
2537
2538 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2539 {
2540         struct in6_ifreq ireq;
2541         int err;
2542
2543         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2544                 return -EPERM;
2545
2546         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2547                 return -EFAULT;
2548
2549         rtnl_lock();
2550         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2551                              ireq.ifr6_prefixlen);
2552         rtnl_unlock();
2553         return err;
2554 }
2555
2556 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2557                      int plen, int scope)
2558 {
2559         struct inet6_ifaddr *ifp;
2560
2561         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2562         if (!IS_ERR(ifp)) {
2563                 spin_lock_bh(&ifp->lock);
2564                 ifp->flags &= ~IFA_F_TENTATIVE;
2565                 spin_unlock_bh(&ifp->lock);
2566                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2567                 in6_ifa_put(ifp);
2568         }
2569 }
2570
2571 #if IS_ENABLED(CONFIG_IPV6_SIT)
2572 static void sit_add_v4_addrs(struct inet6_dev *idev)
2573 {
2574         struct in6_addr addr;
2575         struct net_device *dev;
2576         struct net *net = dev_net(idev->dev);
2577         int scope;
2578
2579         ASSERT_RTNL();
2580
2581         memset(&addr, 0, sizeof(struct in6_addr));
2582         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2583
2584         if (idev->dev->flags&IFF_POINTOPOINT) {
2585                 addr.s6_addr32[0] = htonl(0xfe800000);
2586                 scope = IFA_LINK;
2587         } else {
2588                 scope = IPV6_ADDR_COMPATv4;
2589         }
2590
2591         if (addr.s6_addr32[3]) {
2592                 add_addr(idev, &addr, 128, scope);
2593                 return;
2594         }
2595
2596         for_each_netdev(net, dev) {
2597                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2598                 if (in_dev && (dev->flags & IFF_UP)) {
2599                         struct in_ifaddr *ifa;
2600
2601                         int flag = scope;
2602
2603                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2604                                 int plen;
2605
2606                                 addr.s6_addr32[3] = ifa->ifa_local;
2607
2608                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2609                                         continue;
2610                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2611                                         if (idev->dev->flags&IFF_POINTOPOINT)
2612                                                 continue;
2613                                         flag |= IFA_HOST;
2614                                 }
2615                                 if (idev->dev->flags&IFF_POINTOPOINT)
2616                                         plen = 64;
2617                                 else
2618                                         plen = 96;
2619
2620                                 add_addr(idev, &addr, plen, flag);
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                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2661
2662                         /* Failure cases are ignored */
2663                         if (!IS_ERR(sp_rt)) {
2664                                 sp_ifa->rt = sp_rt;
2665                                 ip6_ins_rt(sp_rt);
2666                         }
2667                 }
2668                 read_unlock_bh(&idev->lock);
2669         }
2670 }
2671
2672 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2673 {
2674         struct inet6_ifaddr *ifp;
2675         u32 addr_flags = IFA_F_PERMANENT;
2676
2677 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2678         if (idev->cnf.optimistic_dad &&
2679             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2680                 addr_flags |= IFA_F_OPTIMISTIC;
2681 #endif
2682
2683
2684         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2685         if (!IS_ERR(ifp)) {
2686                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2687                 addrconf_dad_start(ifp);
2688                 in6_ifa_put(ifp);
2689         }
2690 }
2691
2692 static void addrconf_dev_config(struct net_device *dev)
2693 {
2694         struct in6_addr addr;
2695         struct inet6_dev *idev;
2696
2697         ASSERT_RTNL();
2698
2699         if ((dev->type != ARPHRD_ETHER) &&
2700             (dev->type != ARPHRD_FDDI) &&
2701             (dev->type != ARPHRD_ARCNET) &&
2702             (dev->type != ARPHRD_INFINIBAND) &&
2703             (dev->type != ARPHRD_IEEE802154) &&
2704             (dev->type != ARPHRD_IEEE1394)) {
2705                 /* Alas, we support only Ethernet autoconfiguration. */
2706                 return;
2707         }
2708
2709         idev = addrconf_add_dev(dev);
2710         if (IS_ERR(idev))
2711                 return;
2712
2713         memset(&addr, 0, sizeof(struct in6_addr));
2714         addr.s6_addr32[0] = htonl(0xFE800000);
2715
2716         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2717                 addrconf_add_linklocal(idev, &addr);
2718 }
2719
2720 #if IS_ENABLED(CONFIG_IPV6_SIT)
2721 static void addrconf_sit_config(struct net_device *dev)
2722 {
2723         struct inet6_dev *idev;
2724
2725         ASSERT_RTNL();
2726
2727         /*
2728          * Configure the tunnel with one of our IPv4
2729          * addresses... we should configure all of
2730          * our v4 addrs in the tunnel
2731          */
2732
2733         if ((idev = ipv6_find_idev(dev)) == NULL) {
2734                 pr_debug("%s: add_dev failed\n", __func__);
2735                 return;
2736         }
2737
2738         if (dev->priv_flags & IFF_ISATAP) {
2739                 struct in6_addr addr;
2740
2741                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2742                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2743                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2744                         addrconf_add_linklocal(idev, &addr);
2745                 return;
2746         }
2747
2748         sit_add_v4_addrs(idev);
2749
2750         if (dev->flags&IFF_POINTOPOINT)
2751                 addrconf_add_mroute(dev);
2752         else
2753                 sit_route_add(dev);
2754 }
2755 #endif
2756
2757 #if IS_ENABLED(CONFIG_NET_IPGRE)
2758 static void addrconf_gre_config(struct net_device *dev)
2759 {
2760         struct inet6_dev *idev;
2761         struct in6_addr addr;
2762
2763         pr_info("%s(%s)\n", __func__, dev->name);
2764
2765         ASSERT_RTNL();
2766
2767         if ((idev = ipv6_find_idev(dev)) == NULL) {
2768                 pr_debug("%s: add_dev failed\n", __func__);
2769                 return;
2770         }
2771
2772         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2773         addrconf_prefix_route(&addr, 64, dev, 0, 0);
2774
2775         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2776                 addrconf_add_linklocal(idev, &addr);
2777 }
2778 #endif
2779
2780 static inline int
2781 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2782 {
2783         struct in6_addr lladdr;
2784
2785         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2786                 addrconf_add_linklocal(idev, &lladdr);
2787                 return 0;
2788         }
2789         return -1;
2790 }
2791
2792 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2793 {
2794         struct net_device *link_dev;
2795         struct net *net = dev_net(idev->dev);
2796
2797         /* first try to inherit the link-local address from the link device */
2798         if (idev->dev->iflink &&
2799             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2800                 if (!ipv6_inherit_linklocal(idev, link_dev))
2801                         return;
2802         }
2803         /* then try to inherit it from any device */
2804         for_each_netdev(net, link_dev) {
2805                 if (!ipv6_inherit_linklocal(idev, link_dev))
2806                         return;
2807         }
2808         pr_debug("init ip6-ip6: add_linklocal failed\n");
2809 }
2810
2811 /*
2812  * Autoconfigure tunnel with a link-local address so routing protocols,
2813  * DHCPv6, MLD etc. can be run over the virtual link
2814  */
2815
2816 static void addrconf_ip6_tnl_config(struct net_device *dev)
2817 {
2818         struct inet6_dev *idev;
2819
2820         ASSERT_RTNL();
2821
2822         idev = addrconf_add_dev(dev);
2823         if (IS_ERR(idev)) {
2824                 pr_debug("init ip6-ip6: add_dev failed\n");
2825                 return;
2826         }
2827         ip6_tnl_add_linklocal(idev);
2828 }
2829
2830 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2831                            void *ptr)
2832 {
2833         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2834         struct inet6_dev *idev = __in6_dev_get(dev);
2835         int run_pending = 0;
2836         int err;
2837
2838         switch (event) {
2839         case NETDEV_REGISTER:
2840                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2841                         idev = ipv6_add_dev(dev);
2842                         if (!idev)
2843                                 return notifier_from_errno(-ENOMEM);
2844                 }
2845                 break;
2846
2847         case NETDEV_UP:
2848         case NETDEV_CHANGE:
2849                 if (dev->flags & IFF_SLAVE)
2850                         break;
2851
2852                 if (event == NETDEV_UP) {
2853                         if (!addrconf_qdisc_ok(dev)) {
2854                                 /* device is not ready yet. */
2855                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2856                                         dev->name);
2857                                 break;
2858                         }
2859
2860                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2861                                 idev = ipv6_add_dev(dev);
2862
2863                         if (idev) {
2864                                 idev->if_flags |= IF_READY;
2865                                 run_pending = 1;
2866                         }
2867                 } else {
2868                         if (!addrconf_qdisc_ok(dev)) {
2869                                 /* device is still not ready. */
2870                                 break;
2871                         }
2872
2873                         if (idev) {
2874                                 if (idev->if_flags & IF_READY)
2875                                         /* device is already configured. */
2876                                         break;
2877                                 idev->if_flags |= IF_READY;
2878                         }
2879
2880                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2881                                 dev->name);
2882
2883                         run_pending = 1;
2884                 }
2885
2886                 switch (dev->type) {
2887 #if IS_ENABLED(CONFIG_IPV6_SIT)
2888                 case ARPHRD_SIT:
2889                         addrconf_sit_config(dev);
2890                         break;
2891 #endif
2892 #if IS_ENABLED(CONFIG_NET_IPGRE)
2893                 case ARPHRD_IPGRE:
2894                         addrconf_gre_config(dev);
2895                         break;
2896 #endif
2897                 case ARPHRD_TUNNEL6:
2898                         addrconf_ip6_tnl_config(dev);
2899                         break;
2900                 case ARPHRD_LOOPBACK:
2901                         init_loopback(dev);
2902                         break;
2903
2904                 default:
2905                         addrconf_dev_config(dev);
2906                         break;
2907                 }
2908
2909                 if (idev) {
2910                         if (run_pending)
2911                                 addrconf_dad_run(idev);
2912
2913                         /*
2914                          * If the MTU changed during the interface down,
2915                          * when the interface up, the changed MTU must be
2916                          * reflected in the idev as well as routers.
2917                          */
2918                         if (idev->cnf.mtu6 != dev->mtu &&
2919                             dev->mtu >= IPV6_MIN_MTU) {
2920                                 rt6_mtu_change(dev, dev->mtu);
2921                                 idev->cnf.mtu6 = dev->mtu;
2922                         }
2923                         idev->tstamp = jiffies;
2924                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2925
2926                         /*
2927                          * If the changed mtu during down is lower than
2928                          * IPV6_MIN_MTU stop IPv6 on this interface.
2929                          */
2930                         if (dev->mtu < IPV6_MIN_MTU)
2931                                 addrconf_ifdown(dev, 1);
2932                 }
2933                 break;
2934
2935         case NETDEV_CHANGEMTU:
2936                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2937                         rt6_mtu_change(dev, dev->mtu);
2938                         idev->cnf.mtu6 = dev->mtu;
2939                         break;
2940                 }
2941
2942                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2943                         idev = ipv6_add_dev(dev);
2944                         if (idev)
2945                                 break;
2946                 }
2947
2948                 /*
2949                  * MTU falled under IPV6_MIN_MTU.
2950                  * Stop IPv6 on this interface.
2951                  */
2952
2953         case NETDEV_DOWN:
2954         case NETDEV_UNREGISTER:
2955                 /*
2956                  *      Remove all addresses from this interface.
2957                  */
2958                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2959                 break;
2960
2961         case NETDEV_CHANGENAME:
2962                 if (idev) {
2963                         snmp6_unregister_dev(idev);
2964                         addrconf_sysctl_unregister(idev);
2965                         addrconf_sysctl_register(idev);
2966                         err = snmp6_register_dev(idev);
2967                         if (err)
2968                                 return notifier_from_errno(err);
2969                 }
2970                 break;
2971
2972         case NETDEV_PRE_TYPE_CHANGE:
2973         case NETDEV_POST_TYPE_CHANGE:
2974                 addrconf_type_change(dev, event);
2975                 break;
2976         }
2977
2978         return NOTIFY_OK;
2979 }
2980
2981 /*
2982  *      addrconf module should be notified of a device going up
2983  */
2984 static struct notifier_block ipv6_dev_notf = {
2985         .notifier_call = addrconf_notify,
2986 };
2987
2988 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2989 {
2990         struct inet6_dev *idev;
2991         ASSERT_RTNL();
2992
2993         idev = __in6_dev_get(dev);
2994
2995         if (event == NETDEV_POST_TYPE_CHANGE)
2996                 ipv6_mc_remap(idev);
2997         else if (event == NETDEV_PRE_TYPE_CHANGE)
2998                 ipv6_mc_unmap(idev);
2999 }
3000
3001 static int addrconf_ifdown(struct net_device *dev, int how)
3002 {
3003         struct net *net = dev_net(dev);
3004         struct inet6_dev *idev;
3005         struct inet6_ifaddr *ifa;
3006         int state, i;
3007
3008         ASSERT_RTNL();
3009
3010         rt6_ifdown(net, dev);
3011         neigh_ifdown(&nd_tbl, dev);
3012
3013         idev = __in6_dev_get(dev);
3014         if (idev == NULL)
3015                 return -ENODEV;
3016
3017         /*
3018          * Step 1: remove reference to ipv6 device from parent device.
3019          *         Do not dev_put!
3020          */
3021         if (how) {
3022                 idev->dead = 1;
3023
3024                 /* protected by rtnl_lock */
3025                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3026
3027                 /* Step 1.5: remove snmp6 entry */
3028                 snmp6_unregister_dev(idev);
3029
3030         }
3031
3032         /* Step 2: clear hash table */
3033         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3034                 struct hlist_head *h = &inet6_addr_lst[i];
3035
3036                 spin_lock_bh(&addrconf_hash_lock);
3037         restart:
3038                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3039                         if (ifa->idev == idev) {
3040                                 hlist_del_init_rcu(&ifa->addr_lst);
3041                                 addrconf_del_timer(ifa);
3042                                 goto restart;
3043                         }
3044                 }
3045                 spin_unlock_bh(&addrconf_hash_lock);
3046         }
3047
3048         write_lock_bh(&idev->lock);
3049
3050         /* Step 2: clear flags for stateless addrconf */
3051         if (!how)
3052                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3053
3054 #ifdef CONFIG_IPV6_PRIVACY
3055         if (how && del_timer(&idev->regen_timer))
3056                 in6_dev_put(idev);
3057
3058         /* Step 3: clear tempaddr list */
3059         while (!list_empty(&idev->tempaddr_list)) {
3060                 ifa = list_first_entry(&idev->tempaddr_list,
3061                                        struct inet6_ifaddr, tmp_list);
3062                 list_del(&ifa->tmp_list);
3063                 write_unlock_bh(&idev->lock);
3064                 spin_lock_bh(&ifa->lock);
3065
3066                 if (ifa->ifpub) {
3067                         in6_ifa_put(ifa->ifpub);
3068                         ifa->ifpub = NULL;
3069                 }
3070                 spin_unlock_bh(&ifa->lock);
3071                 in6_ifa_put(ifa);
3072                 write_lock_bh(&idev->lock);
3073         }
3074 #endif
3075
3076         while (!list_empty(&idev->addr_list)) {
3077                 ifa = list_first_entry(&idev->addr_list,
3078                                        struct inet6_ifaddr, if_list);
3079                 addrconf_del_timer(ifa);
3080
3081                 list_del(&ifa->if_list);
3082
3083                 write_unlock_bh(&idev->lock);
3084
3085                 spin_lock_bh(&ifa->state_lock);
3086                 state = ifa->state;
3087                 ifa->state = INET6_IFADDR_STATE_DEAD;
3088                 spin_unlock_bh(&ifa->state_lock);
3089
3090                 if (state != INET6_IFADDR_STATE_DEAD) {
3091                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3092                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3093                 }
3094                 in6_ifa_put(ifa);
3095
3096                 write_lock_bh(&idev->lock);
3097         }
3098
3099         write_unlock_bh(&idev->lock);
3100
3101         /* Step 5: Discard multicast list */
3102         if (how)
3103                 ipv6_mc_destroy_dev(idev);
3104         else
3105                 ipv6_mc_down(idev);
3106
3107         idev->tstamp = jiffies;
3108
3109         /* Last: Shot the device (if unregistered) */
3110         if (how) {
3111                 addrconf_sysctl_unregister(idev);
3112                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3113                 neigh_ifdown(&nd_tbl, dev);
3114                 in6_dev_put(idev);
3115         }
3116         return 0;
3117 }
3118
3119 static void addrconf_rs_timer(unsigned long data)
3120 {
3121         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3122         struct inet6_dev *idev = ifp->idev;
3123
3124         read_lock(&idev->lock);
3125         if (idev->dead || !(idev->if_flags & IF_READY))
3126                 goto out;
3127
3128         if (!ipv6_accept_ra(idev))
3129                 goto out;
3130
3131         /* Announcement received after solicitation was sent */
3132         if (idev->if_flags & IF_RA_RCVD)
3133                 goto out;
3134
3135         spin_lock(&ifp->lock);
3136         if (ifp->probes++ < idev->cnf.rtr_solicits) {
3137                 /* The wait after the last probe can be shorter */
3138                 addrconf_mod_timer(ifp, AC_RS,
3139                                    (ifp->probes == idev->cnf.rtr_solicits) ?
3140                                    idev->cnf.rtr_solicit_delay :
3141                                    idev->cnf.rtr_solicit_interval);
3142                 spin_unlock(&ifp->lock);
3143
3144                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3145         } else {
3146                 spin_unlock(&ifp->lock);
3147                 /*
3148                  * Note: we do not support deprecated "all on-link"
3149                  * assumption any longer.
3150                  */
3151                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3152         }
3153
3154 out:
3155         read_unlock(&idev->lock);
3156         in6_ifa_put(ifp);
3157 }
3158
3159 /*
3160  *      Duplicate Address Detection
3161  */
3162 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3163 {
3164         unsigned long rand_num;
3165         struct inet6_dev *idev = ifp->idev;
3166
3167         if (ifp->flags & IFA_F_OPTIMISTIC)
3168                 rand_num = 0;
3169         else
3170                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3171
3172         ifp->probes = idev->cnf.dad_transmits;
3173         addrconf_mod_timer(ifp, AC_DAD, rand_num);
3174 }
3175
3176 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3177 {
3178         struct inet6_dev *idev = ifp->idev;
3179         struct net_device *dev = idev->dev;
3180
3181         addrconf_join_solict(dev, &ifp->addr);
3182
3183         net_srandom(ifp->addr.s6_addr32[3]);
3184
3185         read_lock_bh(&idev->lock);
3186         spin_lock(&ifp->lock);
3187         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3188                 goto out;
3189
3190         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3191             idev->cnf.accept_dad < 1 ||
3192             !(ifp->flags&IFA_F_TENTATIVE) ||
3193             ifp->flags & IFA_F_NODAD) {
3194                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3195                 spin_unlock(&ifp->lock);
3196                 read_unlock_bh(&idev->lock);
3197
3198                 addrconf_dad_completed(ifp);
3199                 return;
3200         }
3201
3202         if (!(idev->if_flags & IF_READY)) {
3203                 spin_unlock(&ifp->lock);
3204                 read_unlock_bh(&idev->lock);
3205                 /*
3206                  * If the device is not ready:
3207                  * - keep it tentative if it is a permanent address.
3208                  * - otherwise, kill it.
3209                  */
3210                 in6_ifa_hold(ifp);
3211                 addrconf_dad_stop(ifp, 0);
3212                 return;
3213         }
3214
3215         /*
3216          * Optimistic nodes can start receiving
3217          * Frames right away
3218          */
3219         if (ifp->flags & IFA_F_OPTIMISTIC)
3220                 ip6_ins_rt(ifp->rt);
3221
3222         addrconf_dad_kick(ifp);
3223 out:
3224         spin_unlock(&ifp->lock);
3225         read_unlock_bh(&idev->lock);
3226 }
3227
3228 static void addrconf_dad_timer(unsigned long data)
3229 {
3230         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3231         struct inet6_dev *idev = ifp->idev;
3232         struct in6_addr mcaddr;
3233
3234         if (!ifp->probes && addrconf_dad_end(ifp))
3235                 goto out;
3236
3237         read_lock(&idev->lock);
3238         if (idev->dead || !(idev->if_flags & IF_READY)) {
3239                 read_unlock(&idev->lock);
3240                 goto out;
3241         }
3242
3243         spin_lock(&ifp->lock);
3244         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3245                 spin_unlock(&ifp->lock);
3246                 read_unlock(&idev->lock);
3247                 goto out;
3248         }
3249
3250         if (ifp->probes == 0) {
3251                 /*
3252                  * DAD was successful
3253                  */
3254
3255                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3256                 spin_unlock(&ifp->lock);
3257                 read_unlock(&idev->lock);
3258
3259                 addrconf_dad_completed(ifp);
3260
3261                 goto out;
3262         }
3263
3264         ifp->probes--;
3265         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3266         spin_unlock(&ifp->lock);
3267         read_unlock(&idev->lock);
3268
3269         /* send a neighbour solicitation for our addr */
3270         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3271         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3272 out:
3273         in6_ifa_put(ifp);
3274 }
3275
3276 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3277 {
3278         struct net_device *dev = ifp->idev->dev;
3279
3280         /*
3281          *      Configure the address for reception. Now it is valid.
3282          */
3283
3284         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3285
3286         /* If added prefix is link local and we are prepared to process
3287            router advertisements, start sending router solicitations.
3288          */
3289
3290         if (ipv6_accept_ra(ifp->idev) &&
3291             ifp->idev->cnf.rtr_solicits > 0 &&
3292             (dev->flags&IFF_LOOPBACK) == 0 &&
3293             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3294                 /*
3295                  *      If a host as already performed a random delay
3296                  *      [...] as part of DAD [...] there is no need
3297                  *      to delay again before sending the first RS
3298                  */
3299                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3300
3301                 spin_lock_bh(&ifp->lock);
3302                 ifp->probes = 1;
3303                 ifp->idev->if_flags |= IF_RS_SENT;
3304                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3305                 spin_unlock_bh(&ifp->lock);
3306         }
3307 }
3308
3309 static void addrconf_dad_run(struct inet6_dev *idev)
3310 {
3311         struct inet6_ifaddr *ifp;
3312
3313         read_lock_bh(&idev->lock);
3314         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3315                 spin_lock(&ifp->lock);
3316                 if (ifp->flags & IFA_F_TENTATIVE &&
3317                     ifp->state == INET6_IFADDR_STATE_DAD)
3318                         addrconf_dad_kick(ifp);
3319                 spin_unlock(&ifp->lock);
3320         }
3321         read_unlock_bh(&idev->lock);
3322 }
3323
3324 #ifdef CONFIG_PROC_FS
3325 struct if6_iter_state {
3326         struct seq_net_private p;
3327         int bucket;
3328         int offset;
3329 };
3330
3331 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3332 {
3333         struct inet6_ifaddr *ifa = NULL;
3334         struct if6_iter_state *state = seq->private;
3335         struct net *net = seq_file_net(seq);
3336         int p = 0;
3337
3338         /* initial bucket if pos is 0 */
3339         if (pos == 0) {
3340                 state->bucket = 0;
3341                 state->offset = 0;
3342         }
3343
3344         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3345                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3346                                          addr_lst) {
3347                         if (!net_eq(dev_net(ifa->idev->dev), net))
3348                                 continue;
3349                         /* sync with offset */
3350                         if (p < state->offset) {
3351                                 p++;
3352                                 continue;
3353                         }
3354                         state->offset++;
3355                         return ifa;
3356                 }
3357
3358                 /* prepare for next bucket */
3359                 state->offset = 0;
3360                 p = 0;
3361         }
3362         return NULL;
3363 }
3364
3365 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3366                                          struct inet6_ifaddr *ifa)
3367 {
3368         struct if6_iter_state *state = seq->private;
3369         struct net *net = seq_file_net(seq);
3370
3371         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3372                 if (!net_eq(dev_net(ifa->idev->dev), net))
3373                         continue;
3374                 state->offset++;
3375                 return ifa;
3376         }
3377
3378         while (++state->bucket < IN6_ADDR_HSIZE) {
3379                 state->offset = 0;
3380                 hlist_for_each_entry_rcu_bh(ifa,
3381                                      &inet6_addr_lst[state->bucket], addr_lst) {
3382                         if (!net_eq(dev_net(ifa->idev->dev), net))
3383                                 continue;
3384                         state->offset++;
3385                         return ifa;
3386                 }
3387         }
3388
3389         return NULL;
3390 }
3391
3392 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3393         __acquires(rcu_bh)
3394 {
3395         rcu_read_lock_bh();
3396         return if6_get_first(seq, *pos);
3397 }
3398
3399 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3400 {
3401         struct inet6_ifaddr *ifa;
3402
3403         ifa = if6_get_next(seq, v);
3404         ++*pos;
3405         return ifa;
3406 }
3407
3408 static void if6_seq_stop(struct seq_file *seq, void *v)
3409         __releases(rcu_bh)
3410 {
3411         rcu_read_unlock_bh();
3412 }
3413
3414 static int if6_seq_show(struct seq_file *seq, void *v)
3415 {
3416         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3417         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3418                    &ifp->addr,
3419                    ifp->idev->dev->ifindex,
3420                    ifp->prefix_len,
3421                    ifp->scope,
3422                    ifp->flags,
3423                    ifp->idev->dev->name);
3424         return 0;
3425 }
3426
3427 static const struct seq_operations if6_seq_ops = {
3428         .start  = if6_seq_start,
3429         .next   = if6_seq_next,
3430         .show   = if6_seq_show,
3431         .stop   = if6_seq_stop,
3432 };
3433
3434 static int if6_seq_open(struct inode *inode, struct file *file)
3435 {
3436         return seq_open_net(inode, file, &if6_seq_ops,
3437                             sizeof(struct if6_iter_state));
3438 }
3439
3440 static const struct file_operations if6_fops = {
3441         .owner          = THIS_MODULE,
3442         .open           = if6_seq_open,
3443         .read           = seq_read,
3444         .llseek         = seq_lseek,
3445         .release        = seq_release_net,
3446 };
3447
3448 static int __net_init if6_proc_net_init(struct net *net)
3449 {
3450         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3451                 return -ENOMEM;
3452         return 0;
3453 }
3454
3455 static void __net_exit if6_proc_net_exit(struct net *net)
3456 {
3457         remove_proc_entry("if_inet6", net->proc_net);
3458 }
3459
3460 static struct pernet_operations if6_proc_net_ops = {
3461        .init = if6_proc_net_init,
3462        .exit = if6_proc_net_exit,
3463 };
3464
3465 int __init if6_proc_init(void)
3466 {
3467         return register_pernet_subsys(&if6_proc_net_ops);
3468 }
3469
3470 void if6_proc_exit(void)
3471 {
3472         unregister_pernet_subsys(&if6_proc_net_ops);
3473 }
3474 #endif  /* CONFIG_PROC_FS */
3475
3476 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3477 /* Check if address is a home address configured on any interface. */
3478 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3479 {
3480         int ret = 0;
3481         struct inet6_ifaddr *ifp = NULL;
3482         unsigned int hash = inet6_addr_hash(addr);
3483
3484         rcu_read_lock_bh();
3485         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3486                 if (!net_eq(dev_net(ifp->idev->dev), net))
3487                         continue;
3488                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3489                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3490                         ret = 1;
3491                         break;
3492                 }
3493         }
3494         rcu_read_unlock_bh();
3495         return ret;
3496 }
3497 #endif
3498
3499 /*
3500  *      Periodic address status verification
3501  */
3502
3503 static void addrconf_verify(unsigned long foo)
3504 {
3505         unsigned long now, next, next_sec, next_sched;
3506         struct inet6_ifaddr *ifp;
3507         int i;
3508
3509         rcu_read_lock_bh();
3510         spin_lock(&addrconf_verify_lock);
3511         now = jiffies;
3512         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3513
3514         del_timer(&addr_chk_timer);
3515
3516         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3517 restart:
3518                 hlist_for_each_entry_rcu_bh(ifp,
3519                                          &inet6_addr_lst[i], addr_lst) {
3520                         unsigned long age;
3521
3522                         if (ifp->flags & IFA_F_PERMANENT)
3523                                 continue;
3524
3525                         spin_lock(&ifp->lock);
3526                         /* We try to batch several events at once. */
3527                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3528
3529                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3530                             age >= ifp->valid_lft) {
3531                                 spin_unlock(&ifp->lock);
3532                                 in6_ifa_hold(ifp);
3533                                 ipv6_del_addr(ifp);
3534                                 goto restart;
3535                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3536                                 spin_unlock(&ifp->lock);
3537                                 continue;
3538                         } else if (age >= ifp->prefered_lft) {
3539                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3540                                 int deprecate = 0;
3541
3542                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3543                                         deprecate = 1;
3544                                         ifp->flags |= IFA_F_DEPRECATED;
3545                                 }
3546
3547                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3548                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3549
3550                                 spin_unlock(&ifp->lock);
3551
3552                                 if (deprecate) {
3553                                         in6_ifa_hold(ifp);
3554
3555                                         ipv6_ifa_notify(0, ifp);
3556                                         in6_ifa_put(ifp);
3557                                         goto restart;
3558                                 }
3559 #ifdef CONFIG_IPV6_PRIVACY
3560                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3561                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3562                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3563                                         ifp->idev->cnf.dad_transmits *
3564                                         ifp->idev->nd_parms->retrans_time / HZ;
3565
3566                                 if (age >= ifp->prefered_lft - regen_advance) {
3567                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3568                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3569                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3570                                         if (!ifp->regen_count && ifpub) {
3571                                                 ifp->regen_count++;
3572                                                 in6_ifa_hold(ifp);
3573                                                 in6_ifa_hold(ifpub);
3574                                                 spin_unlock(&ifp->lock);
3575
3576                                                 spin_lock(&ifpub->lock);
3577                                                 ifpub->regen_count = 0;
3578                                                 spin_unlock(&ifpub->lock);
3579                                                 ipv6_create_tempaddr(ifpub, ifp);
3580                                                 in6_ifa_put(ifpub);
3581                                                 in6_ifa_put(ifp);
3582                                                 goto restart;
3583                                         }
3584                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3585                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3586                                 spin_unlock(&ifp->lock);
3587 #endif
3588                         } else {
3589                                 /* ifp->prefered_lft <= ifp->valid_lft */
3590                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3591                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3592                                 spin_unlock(&ifp->lock);
3593                         }
3594                 }
3595         }
3596
3597         next_sec = round_jiffies_up(next);
3598         next_sched = next;
3599
3600         /* If rounded timeout is accurate enough, accept it. */
3601         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3602                 next_sched = next_sec;
3603
3604         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3605         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3606                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3607
3608         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3609               now, next, next_sec, next_sched));
3610
3611         addr_chk_timer.expires = next_sched;
3612         add_timer(&addr_chk_timer);
3613         spin_unlock(&addrconf_verify_lock);
3614         rcu_read_unlock_bh();
3615 }
3616
3617 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3618                                      struct in6_addr **peer_pfx)
3619 {
3620         struct in6_addr *pfx = NULL;
3621
3622         *peer_pfx = NULL;
3623
3624         if (addr)
3625                 pfx = nla_data(addr);
3626
3627         if (local) {
3628                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3629                         *peer_pfx = pfx;
3630                 pfx = nla_data(local);
3631         }
3632
3633         return pfx;
3634 }
3635
3636 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3637         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3638         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3639         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3640 };
3641
3642 static int
3643 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3644 {
3645         struct net *net = sock_net(skb->sk);
3646         struct ifaddrmsg *ifm;
3647         struct nlattr *tb[IFA_MAX+1];
3648         struct in6_addr *pfx, *peer_pfx;
3649         int err;
3650
3651         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3652         if (err < 0)
3653                 return err;
3654
3655         ifm = nlmsg_data(nlh);
3656         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3657         if (pfx == NULL)
3658                 return -EINVAL;
3659
3660         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3661 }
3662
3663 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3664                              u32 prefered_lft, u32 valid_lft)
3665 {
3666         u32 flags;
3667         clock_t expires;
3668         unsigned long timeout;
3669
3670         if (!valid_lft || (prefered_lft > valid_lft))
3671                 return -EINVAL;
3672
3673         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3674         if (addrconf_finite_timeout(timeout)) {
3675                 expires = jiffies_to_clock_t(timeout * HZ);
3676                 valid_lft = timeout;
3677                 flags = RTF_EXPIRES;
3678         } else {
3679                 expires = 0;
3680                 flags = 0;
3681                 ifa_flags |= IFA_F_PERMANENT;
3682         }
3683
3684         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3685         if (addrconf_finite_timeout(timeout)) {
3686                 if (timeout == 0)
3687                         ifa_flags |= IFA_F_DEPRECATED;
3688                 prefered_lft = timeout;
3689         }
3690
3691         spin_lock_bh(&ifp->lock);
3692         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3693         ifp->tstamp = jiffies;
3694         ifp->valid_lft = valid_lft;
3695         ifp->prefered_lft = prefered_lft;
3696
3697         spin_unlock_bh(&ifp->lock);
3698         if (!(ifp->flags&IFA_F_TENTATIVE))
3699                 ipv6_ifa_notify(0, ifp);
3700
3701         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3702                               expires, flags);
3703         addrconf_verify(0);
3704
3705         return 0;
3706 }
3707
3708 static int
3709 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3710 {
3711         struct net *net = sock_net(skb->sk);
3712         struct ifaddrmsg *ifm;
3713         struct nlattr *tb[IFA_MAX+1];
3714         struct in6_addr *pfx, *peer_pfx;
3715         struct inet6_ifaddr *ifa;
3716         struct net_device *dev;
3717         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3718         u8 ifa_flags;
3719         int err;
3720
3721         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3722         if (err < 0)
3723                 return err;
3724
3725         ifm = nlmsg_data(nlh);
3726         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3727         if (pfx == NULL)
3728                 return -EINVAL;
3729
3730         if (tb[IFA_CACHEINFO]) {
3731                 struct ifa_cacheinfo *ci;
3732
3733                 ci = nla_data(tb[IFA_CACHEINFO]);
3734                 valid_lft = ci->ifa_valid;
3735                 preferred_lft = ci->ifa_prefered;
3736         } else {
3737                 preferred_lft = INFINITY_LIFE_TIME;
3738                 valid_lft = INFINITY_LIFE_TIME;
3739         }
3740
3741         dev =  __dev_get_by_index(net, ifm->ifa_index);
3742         if (dev == NULL)
3743                 return -ENODEV;
3744
3745         /* We ignore other flags so far. */
3746         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3747
3748         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3749         if (ifa == NULL) {
3750                 /*
3751                  * It would be best to check for !NLM_F_CREATE here but
3752                  * userspace alreay relies on not having to provide this.
3753                  */
3754                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3755                                       ifm->ifa_prefixlen, ifa_flags,
3756                                       preferred_lft, valid_lft);
3757         }
3758
3759         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3760             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3761                 err = -EEXIST;
3762         else
3763                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3764
3765         in6_ifa_put(ifa);
3766
3767         return err;
3768 }
3769
3770 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3771                           u8 scope, int ifindex)
3772 {
3773         struct ifaddrmsg *ifm;
3774
3775         ifm = nlmsg_data(nlh);
3776         ifm->ifa_family = AF_INET6;
3777         ifm->ifa_prefixlen = prefixlen;
3778         ifm->ifa_flags = flags;
3779         ifm->ifa_scope = scope;
3780         ifm->ifa_index = ifindex;
3781 }
3782
3783 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3784                          unsigned long tstamp, u32 preferred, u32 valid)
3785 {
3786         struct ifa_cacheinfo ci;
3787
3788         ci.cstamp = cstamp_delta(cstamp);
3789         ci.tstamp = cstamp_delta(tstamp);
3790         ci.ifa_prefered = preferred;
3791         ci.ifa_valid = valid;
3792
3793         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3794 }
3795
3796 static inline int rt_scope(int ifa_scope)
3797 {
3798         if (ifa_scope & IFA_HOST)
3799                 return RT_SCOPE_HOST;
3800         else if (ifa_scope & IFA_LINK)
3801                 return RT_SCOPE_LINK;
3802         else if (ifa_scope & IFA_SITE)
3803                 return RT_SCOPE_SITE;
3804         else
3805                 return RT_SCOPE_UNIVERSE;
3806 }
3807
3808 static inline int inet6_ifaddr_msgsize(void)
3809 {
3810         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3811                + nla_total_size(16) /* IFA_LOCAL */
3812                + nla_total_size(16) /* IFA_ADDRESS */
3813                + nla_total_size(sizeof(struct ifa_cacheinfo));
3814 }
3815
3816 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3817                              u32 portid, u32 seq, int event, unsigned int flags)
3818 {
3819         struct nlmsghdr  *nlh;
3820         u32 preferred, valid;
3821
3822         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3823         if (nlh == NULL)
3824                 return -EMSGSIZE;
3825
3826         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3827                       ifa->idev->dev->ifindex);
3828
3829         if (!(ifa->flags&IFA_F_PERMANENT)) {
3830                 preferred = ifa->prefered_lft;
3831                 valid = ifa->valid_lft;
3832                 if (preferred != INFINITY_LIFE_TIME) {
3833                         long tval = (jiffies - ifa->tstamp)/HZ;
3834                         if (preferred > tval)
3835                                 preferred -= tval;
3836                         else
3837                                 preferred = 0;
3838                         if (valid != INFINITY_LIFE_TIME) {
3839                                 if (valid > tval)
3840                                         valid -= tval;
3841                                 else
3842                                         valid = 0;
3843                         }
3844                 }
3845         } else {
3846                 preferred = INFINITY_LIFE_TIME;
3847                 valid = INFINITY_LIFE_TIME;
3848         }
3849
3850         if (!ipv6_addr_any(&ifa->peer_addr)) {
3851                 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3852                     nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3853                         goto error;
3854         } else
3855                 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3856                         goto error;
3857
3858         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3859                 goto error;
3860
3861         return nlmsg_end(skb, nlh);
3862
3863 error:
3864         nlmsg_cancel(skb, nlh);
3865         return -EMSGSIZE;
3866 }
3867
3868 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3869                                 u32 portid, u32 seq, int event, u16 flags)
3870 {
3871         struct nlmsghdr  *nlh;
3872         u8 scope = RT_SCOPE_UNIVERSE;
3873         int ifindex = ifmca->idev->dev->ifindex;
3874
3875         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3876                 scope = RT_SCOPE_SITE;
3877
3878         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3879         if (nlh == NULL)
3880                 return -EMSGSIZE;
3881
3882         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3883         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3884             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3885                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3886                 nlmsg_cancel(skb, nlh);
3887                 return -EMSGSIZE;
3888         }
3889
3890         return nlmsg_end(skb, nlh);
3891 }
3892
3893 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3894                                 u32 portid, u32 seq, int event, unsigned int flags)
3895 {
3896         struct nlmsghdr  *nlh;
3897         u8 scope = RT_SCOPE_UNIVERSE;
3898         int ifindex = ifaca->aca_idev->dev->ifindex;
3899
3900         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3901                 scope = RT_SCOPE_SITE;
3902
3903         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3904         if (nlh == NULL)
3905                 return -EMSGSIZE;
3906
3907         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3908         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3909             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3910                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3911                 nlmsg_cancel(skb, nlh);
3912                 return -EMSGSIZE;
3913         }
3914
3915         return nlmsg_end(skb, nlh);
3916 }
3917
3918 enum addr_type_t {
3919         UNICAST_ADDR,
3920         MULTICAST_ADDR,
3921         ANYCAST_ADDR,
3922 };
3923
3924 /* called with rcu_read_lock() */
3925 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3926                           struct netlink_callback *cb, enum addr_type_t type,
3927                           int s_ip_idx, int *p_ip_idx)
3928 {
3929         struct ifmcaddr6 *ifmca;
3930         struct ifacaddr6 *ifaca;
3931         int err = 1;
3932         int ip_idx = *p_ip_idx;
3933
3934         read_lock_bh(&idev->lock);
3935         switch (type) {
3936         case UNICAST_ADDR: {
3937                 struct inet6_ifaddr *ifa;
3938
3939                 /* unicast address incl. temp addr */
3940                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3941                         if (++ip_idx < s_ip_idx)
3942                                 continue;
3943                         err = inet6_fill_ifaddr(skb, ifa,
3944                                                 NETLINK_CB(cb->skb).portid,
3945                                                 cb->nlh->nlmsg_seq,
3946                                                 RTM_NEWADDR,
3947                                                 NLM_F_MULTI);
3948                         if (err <= 0)
3949                                 break;
3950                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3951                 }
3952                 break;
3953         }
3954         case MULTICAST_ADDR:
3955                 /* multicast address */
3956                 for (ifmca = idev->mc_list; ifmca;
3957                      ifmca = ifmca->next, ip_idx++) {
3958                         if (ip_idx < s_ip_idx)
3959                                 continue;
3960                         err = inet6_fill_ifmcaddr(skb, ifmca,
3961                                                   NETLINK_CB(cb->skb).portid,
3962                                                   cb->nlh->nlmsg_seq,
3963                                                   RTM_GETMULTICAST,
3964                                                   NLM_F_MULTI);
3965                         if (err <= 0)
3966                                 break;
3967                 }
3968                 break;
3969         case ANYCAST_ADDR:
3970                 /* anycast address */
3971                 for (ifaca = idev->ac_list; ifaca;
3972                      ifaca = ifaca->aca_next, ip_idx++) {
3973                         if (ip_idx < s_ip_idx)
3974                                 continue;
3975                         err = inet6_fill_ifacaddr(skb, ifaca,
3976                                                   NETLINK_CB(cb->skb).portid,
3977                                                   cb->nlh->nlmsg_seq,
3978                                                   RTM_GETANYCAST,
3979                                                   NLM_F_MULTI);
3980                         if (err <= 0)
3981                                 break;
3982                 }
3983                 break;
3984         default:
3985                 break;
3986         }
3987         read_unlock_bh(&idev->lock);
3988         *p_ip_idx = ip_idx;
3989         return err;
3990 }
3991
3992 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3993                            enum addr_type_t type)
3994 {
3995         struct net *net = sock_net(skb->sk);
3996         int h, s_h;
3997         int idx, ip_idx;
3998         int s_idx, s_ip_idx;
3999         struct net_device *dev;
4000         struct inet6_dev *idev;
4001         struct hlist_head *head;
4002
4003         s_h = cb->args[0];
4004         s_idx = idx = cb->args[1];
4005         s_ip_idx = ip_idx = cb->args[2];
4006
4007         rcu_read_lock();
4008         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4009         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4010                 idx = 0;
4011                 head = &net->dev_index_head[h];
4012                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4013                         if (idx < s_idx)
4014                                 goto cont;
4015                         if (h > s_h || idx > s_idx)
4016                                 s_ip_idx = 0;
4017                         ip_idx = 0;
4018                         idev = __in6_dev_get(dev);
4019                         if (!idev)
4020                                 goto cont;
4021
4022                         if (in6_dump_addrs(idev, skb, cb, type,
4023                                            s_ip_idx, &ip_idx) <= 0)
4024                                 goto done;
4025 cont:
4026                         idx++;
4027                 }
4028         }
4029 done:
4030         rcu_read_unlock();
4031         cb->args[0] = h;
4032         cb->args[1] = idx;
4033         cb->args[2] = ip_idx;
4034
4035         return skb->len;
4036 }
4037
4038 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4039 {
4040         enum addr_type_t type = UNICAST_ADDR;
4041
4042         return inet6_dump_addr(skb, cb, type);
4043 }
4044
4045 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4046 {
4047         enum addr_type_t type = MULTICAST_ADDR;
4048
4049         return inet6_dump_addr(skb, cb, type);
4050 }
4051
4052
4053 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4054 {
4055         enum addr_type_t type = ANYCAST_ADDR;
4056
4057         return inet6_dump_addr(skb, cb, type);
4058 }
4059
4060 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4061 {
4062         struct net *net = sock_net(in_skb->sk);
4063         struct ifaddrmsg *ifm;
4064         struct nlattr *tb[IFA_MAX+1];
4065         struct in6_addr *addr = NULL, *peer;
4066         struct net_device *dev = NULL;
4067         struct inet6_ifaddr *ifa;
4068         struct sk_buff *skb;
4069         int err;
4070
4071         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4072         if (err < 0)
4073                 goto errout;
4074
4075         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4076         if (addr == NULL) {
4077                 err = -EINVAL;
4078                 goto errout;
4079         }
4080
4081         ifm = nlmsg_data(nlh);
4082         if (ifm->ifa_index)
4083                 dev = __dev_get_by_index(net, ifm->ifa_index);
4084
4085         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4086         if (!ifa) {
4087                 err = -EADDRNOTAVAIL;
4088                 goto errout;
4089         }
4090
4091         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4092         if (!skb) {
4093                 err = -ENOBUFS;
4094                 goto errout_ifa;
4095         }
4096
4097         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4098                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4099         if (err < 0) {
4100                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4101                 WARN_ON(err == -EMSGSIZE);
4102                 kfree_skb(skb);
4103                 goto errout_ifa;
4104         }
4105         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4106 errout_ifa:
4107         in6_ifa_put(ifa);
4108 errout:
4109         return err;
4110 }
4111
4112 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4113 {
4114         struct sk_buff *skb;
4115         struct net *net = dev_net(ifa->idev->dev);
4116         int err = -ENOBUFS;
4117
4118         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4119         if (skb == NULL)
4120                 goto errout;
4121
4122         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4123         if (err < 0) {
4124                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4125                 WARN_ON(err == -EMSGSIZE);
4126                 kfree_skb(skb);
4127                 goto errout;
4128         }
4129         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4130         return;
4131 errout:
4132         if (err < 0)
4133                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4134 }
4135
4136 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4137                                 __s32 *array, int bytes)
4138 {
4139         BUG_ON(bytes < (DEVCONF_MAX * 4));
4140
4141         memset(array, 0, bytes);
4142         array[DEVCONF_FORWARDING] = cnf->forwarding;
4143         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4144         array[DEVCONF_MTU6] = cnf->mtu6;
4145         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4146         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4147         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4148         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4149         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4150         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4151                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4152         array[DEVCONF_RTR_SOLICIT_DELAY] =
4153                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4154         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4155 #ifdef CONFIG_IPV6_PRIVACY
4156         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4157         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4158         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4159         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4160         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4161 #endif
4162         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4163         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4164         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4165 #ifdef CONFIG_IPV6_ROUTER_PREF
4166         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4167         array[DEVCONF_RTR_PROBE_INTERVAL] =
4168                 jiffies_to_msecs(cnf->rtr_probe_interval);
4169 #ifdef CONFIG_IPV6_ROUTE_INFO
4170         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4171 #endif
4172 #endif
4173         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4174         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4175 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4176         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4177 #endif
4178 #ifdef CONFIG_IPV6_MROUTE
4179         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4180 #endif
4181         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4182         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4183         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4184         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4185 }
4186
4187 static inline size_t inet6_ifla6_size(void)
4188 {
4189         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4190              + nla_total_size(sizeof(struct ifla_cacheinfo))
4191              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4192              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4193              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4194              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4195 }
4196
4197 static inline size_t inet6_if_nlmsg_size(void)
4198 {
4199         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4200                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4201                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4202                + nla_total_size(4) /* IFLA_MTU */
4203                + nla_total_size(4) /* IFLA_LINK */
4204                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4205 }
4206
4207 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4208                                       int items, int bytes)
4209 {
4210         int i;
4211         int pad = bytes - sizeof(u64) * items;
4212         BUG_ON(pad < 0);
4213
4214         /* Use put_unaligned() because stats may not be aligned for u64. */
4215         put_unaligned(items, &stats[0]);
4216         for (i = 1; i < items; i++)
4217                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4218
4219         memset(&stats[items], 0, pad);
4220 }
4221
4222 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4223                                       int items, int bytes, size_t syncpoff)
4224 {
4225         int i;
4226         int pad = bytes - sizeof(u64) * items;
4227         BUG_ON(pad < 0);
4228
4229         /* Use put_unaligned() because stats may not be aligned for u64. */
4230         put_unaligned(items, &stats[0]);
4231         for (i = 1; i < items; i++)
4232                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4233
4234         memset(&stats[items], 0, pad);
4235 }
4236
4237 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4238                              int bytes)
4239 {
4240         switch (attrtype) {
4241         case IFLA_INET6_STATS:
4242                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4243                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4244                 break;
4245         case IFLA_INET6_ICMP6STATS:
4246                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4247                 break;
4248         }
4249 }
4250
4251 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4252 {
4253         struct nlattr *nla;
4254         struct ifla_cacheinfo ci;
4255
4256         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4257                 goto nla_put_failure;
4258         ci.max_reasm_len = IPV6_MAXPLEN;
4259         ci.tstamp = cstamp_delta(idev->tstamp);
4260         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4261         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4262         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4263                 goto nla_put_failure;
4264         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4265         if (nla == NULL)
4266                 goto nla_put_failure;
4267         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4268
4269         /* XXX - MC not implemented */
4270
4271         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4272         if (nla == NULL)
4273                 goto nla_put_failure;
4274         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4275
4276         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4277         if (nla == NULL)
4278                 goto nla_put_failure;
4279         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4280
4281         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4282         if (nla == NULL)
4283                 goto nla_put_failure;
4284         read_lock_bh(&idev->lock);
4285         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4286         read_unlock_bh(&idev->lock);
4287
4288         return 0;
4289
4290 nla_put_failure:
4291         return -EMSGSIZE;
4292 }
4293
4294 static size_t inet6_get_link_af_size(const struct net_device *dev)
4295 {
4296         if (!__in6_dev_get(dev))
4297                 return 0;
4298
4299         return inet6_ifla6_size();
4300 }
4301
4302 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4303 {
4304         struct inet6_dev *idev = __in6_dev_get(dev);
4305
4306         if (!idev)
4307                 return -ENODATA;
4308
4309         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4310                 return -EMSGSIZE;
4311
4312         return 0;
4313 }
4314
4315 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4316 {
4317         struct inet6_ifaddr *ifp;
4318         struct net_device *dev = idev->dev;
4319         bool update_rs = false;
4320
4321         if (token == NULL)
4322                 return -EINVAL;
4323         if (ipv6_addr_any(token))
4324                 return -EINVAL;
4325         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4326                 return -EINVAL;
4327         if (!ipv6_accept_ra(idev))
4328                 return -EINVAL;
4329         if (idev->cnf.rtr_solicits <= 0)
4330                 return -EINVAL;
4331
4332         write_lock_bh(&idev->lock);
4333
4334         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4335         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4336
4337         write_unlock_bh(&idev->lock);
4338
4339         if (!idev->dead && (idev->if_flags & IF_READY)) {
4340                 struct in6_addr ll_addr;
4341
4342                 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4343                                 IFA_F_OPTIMISTIC);
4344
4345                 /* If we're not ready, then normal ifup will take care
4346                  * of this. Otherwise, we need to request our rs here.
4347                  */
4348                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4349                 update_rs = true;
4350         }
4351
4352         write_lock_bh(&idev->lock);
4353
4354         if (update_rs)
4355                 idev->if_flags |= IF_RS_SENT;
4356
4357         /* Well, that's kinda nasty ... */
4358         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4359                 spin_lock(&ifp->lock);
4360                 if (ifp->tokenized) {
4361                         ifp->valid_lft = 0;
4362                         ifp->prefered_lft = 0;
4363                 }
4364                 spin_unlock(&ifp->lock);
4365         }
4366
4367         write_unlock_bh(&idev->lock);
4368         return 0;
4369 }
4370
4371 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4372 {
4373         int err = -EINVAL;
4374         struct inet6_dev *idev = __in6_dev_get(dev);
4375         struct nlattr *tb[IFLA_INET6_MAX + 1];
4376
4377         if (!idev)
4378                 return -EAFNOSUPPORT;
4379
4380         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4381                 BUG();
4382
4383         if (tb[IFLA_INET6_TOKEN])
4384                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4385
4386         return err;
4387 }
4388
4389 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4390                              u32 portid, u32 seq, int event, unsigned int flags)
4391 {
4392         struct net_device *dev = idev->dev;
4393         struct ifinfomsg *hdr;
4394         struct nlmsghdr *nlh;
4395         void *protoinfo;
4396
4397         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4398         if (nlh == NULL)
4399                 return -EMSGSIZE;
4400
4401         hdr = nlmsg_data(nlh);
4402         hdr->ifi_family = AF_INET6;
4403         hdr->__ifi_pad = 0;
4404         hdr->ifi_type = dev->type;
4405         hdr->ifi_index = dev->ifindex;
4406         hdr->ifi_flags = dev_get_flags(dev);
4407         hdr->ifi_change = 0;
4408
4409         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4410             (dev->addr_len &&
4411              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4412             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4413             (dev->ifindex != dev->iflink &&
4414              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4415                 goto nla_put_failure;
4416         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4417         if (protoinfo == NULL)
4418                 goto nla_put_failure;
4419
4420         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4421                 goto nla_put_failure;
4422
4423         nla_nest_end(skb, protoinfo);
4424         return nlmsg_end(skb, nlh);
4425
4426 nla_put_failure:
4427         nlmsg_cancel(skb, nlh);
4428         return -EMSGSIZE;
4429 }
4430
4431 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4432 {
4433         struct net *net = sock_net(skb->sk);
4434         int h, s_h;
4435         int idx = 0, s_idx;
4436         struct net_device *dev;
4437         struct inet6_dev *idev;
4438         struct hlist_head *head;
4439
4440         s_h = cb->args[0];
4441         s_idx = cb->args[1];
4442
4443         rcu_read_lock();
4444         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4445                 idx = 0;
4446                 head = &net->dev_index_head[h];
4447                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4448                         if (idx < s_idx)
4449                                 goto cont;
4450                         idev = __in6_dev_get(dev);
4451                         if (!idev)
4452                                 goto cont;
4453                         if (inet6_fill_ifinfo(skb, idev,
4454                                               NETLINK_CB(cb->skb).portid,
4455                                               cb->nlh->nlmsg_seq,
4456                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4457                                 goto out;
4458 cont:
4459                         idx++;
4460                 }
4461         }
4462 out:
4463         rcu_read_unlock();
4464         cb->args[1] = idx;
4465         cb->args[0] = h;
4466
4467         return skb->len;
4468 }
4469
4470 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4471 {
4472         struct sk_buff *skb;
4473         struct net *net = dev_net(idev->dev);
4474         int err = -ENOBUFS;
4475
4476         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4477         if (skb == NULL)
4478                 goto errout;
4479
4480         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4481         if (err < 0) {
4482                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4483                 WARN_ON(err == -EMSGSIZE);
4484                 kfree_skb(skb);
4485                 goto errout;
4486         }
4487         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4488         return;
4489 errout:
4490         if (err < 0)
4491                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4492 }
4493
4494 static inline size_t inet6_prefix_nlmsg_size(void)
4495 {
4496         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4497                + nla_total_size(sizeof(struct in6_addr))
4498                + nla_total_size(sizeof(struct prefix_cacheinfo));
4499 }
4500
4501 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4502                              struct prefix_info *pinfo, u32 portid, u32 seq,
4503                              int event, unsigned int flags)
4504 {
4505         struct prefixmsg *pmsg;
4506         struct nlmsghdr *nlh;
4507         struct prefix_cacheinfo ci;
4508
4509         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4510         if (nlh == NULL)
4511                 return -EMSGSIZE;
4512
4513         pmsg = nlmsg_data(nlh);
4514         pmsg->prefix_family = AF_INET6;
4515         pmsg->prefix_pad1 = 0;
4516         pmsg->prefix_pad2 = 0;
4517         pmsg->prefix_ifindex = idev->dev->ifindex;
4518         pmsg->prefix_len = pinfo->prefix_len;
4519         pmsg->prefix_type = pinfo->type;
4520         pmsg->prefix_pad3 = 0;
4521         pmsg->prefix_flags = 0;
4522         if (pinfo->onlink)
4523                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4524         if (pinfo->autoconf)
4525                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4526
4527         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4528                 goto nla_put_failure;
4529         ci.preferred_time = ntohl(pinfo->prefered);
4530         ci.valid_time = ntohl(pinfo->valid);
4531         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4532                 goto nla_put_failure;
4533         return nlmsg_end(skb, nlh);
4534
4535 nla_put_failure:
4536         nlmsg_cancel(skb, nlh);
4537         return -EMSGSIZE;
4538 }
4539
4540 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4541                          struct prefix_info *pinfo)
4542 {
4543         struct sk_buff *skb;
4544         struct net *net = dev_net(idev->dev);
4545         int err = -ENOBUFS;
4546
4547         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4548         if (skb == NULL)
4549                 goto errout;
4550
4551         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4552         if (err < 0) {
4553                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4554                 WARN_ON(err == -EMSGSIZE);
4555                 kfree_skb(skb);
4556                 goto errout;
4557         }
4558         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4559         return;
4560 errout:
4561         if (err < 0)
4562                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4563 }
4564
4565 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4566 {
4567         struct net *net = dev_net(ifp->idev->dev);
4568
4569         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4570
4571         switch (event) {
4572         case RTM_NEWADDR:
4573                 /*
4574                  * If the address was optimistic
4575                  * we inserted the route at the start of
4576                  * our DAD process, so we don't need
4577                  * to do it again
4578                  */
4579                 if (!(ifp->rt->rt6i_node))
4580                         ip6_ins_rt(ifp->rt);
4581                 if (ifp->idev->cnf.forwarding)
4582                         addrconf_join_anycast(ifp);
4583                 if (!ipv6_addr_any(&ifp->peer_addr))
4584                         addrconf_prefix_route(&ifp->peer_addr, 128,
4585                                               ifp->idev->dev, 0, 0);
4586                 break;
4587         case RTM_DELADDR:
4588                 if (ifp->idev->cnf.forwarding)
4589                         addrconf_leave_anycast(ifp);
4590                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4591                 if (!ipv6_addr_any(&ifp->peer_addr)) {
4592                         struct rt6_info *rt;
4593                         struct net_device *dev = ifp->idev->dev;
4594
4595                         rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4596                                         dev->ifindex, 1);
4597                         if (rt) {
4598                                 dst_hold(&rt->dst);
4599                                 if (ip6_del_rt(rt))
4600                                         dst_free(&rt->dst);
4601                         }
4602                 }
4603                 dst_hold(&ifp->rt->dst);
4604
4605                 if (ip6_del_rt(ifp->rt))
4606                         dst_free(&ifp->rt->dst);
4607                 break;
4608         }
4609         atomic_inc(&net->ipv6.dev_addr_genid);
4610 }
4611
4612 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4613 {
4614         rcu_read_lock_bh();
4615         if (likely(ifp->idev->dead == 0))
4616                 __ipv6_ifa_notify(event, ifp);
4617         rcu_read_unlock_bh();
4618 }
4619
4620 #ifdef CONFIG_SYSCTL
4621
4622 static
4623 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4624                            void __user *buffer, size_t *lenp, loff_t *ppos)
4625 {
4626         int *valp = ctl->data;
4627         int val = *valp;
4628         loff_t pos = *ppos;
4629         ctl_table lctl;
4630         int ret;
4631
4632         /*
4633          * ctl->data points to idev->cnf.forwarding, we should
4634          * not modify it until we get the rtnl lock.
4635          */
4636         lctl = *ctl;
4637         lctl.data = &val;
4638
4639         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4640
4641         if (write)
4642                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4643         if (ret)
4644                 *ppos = pos;
4645         return ret;
4646 }
4647
4648 static void dev_disable_change(struct inet6_dev *idev)
4649 {
4650         struct netdev_notifier_info info;
4651
4652         if (!idev || !idev->dev)
4653                 return;
4654
4655         netdev_notifier_info_init(&info, idev->dev);
4656         if (idev->cnf.disable_ipv6)
4657                 addrconf_notify(NULL, NETDEV_DOWN, &info);
4658         else
4659                 addrconf_notify(NULL, NETDEV_UP, &info);
4660 }
4661
4662 static void addrconf_disable_change(struct net *net, __s32 newf)
4663 {
4664         struct net_device *dev;
4665         struct inet6_dev *idev;
4666
4667         rcu_read_lock();
4668         for_each_netdev_rcu(net, dev) {
4669                 idev = __in6_dev_get(dev);
4670                 if (idev) {
4671                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4672                         idev->cnf.disable_ipv6 = newf;
4673                         if (changed)
4674                                 dev_disable_change(idev);
4675                 }
4676         }
4677         rcu_read_unlock();
4678 }
4679
4680 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4681 {
4682         struct net *net;
4683         int old;
4684
4685         if (!rtnl_trylock())
4686                 return restart_syscall();
4687
4688         net = (struct net *)table->extra2;
4689         old = *p;
4690         *p = newf;
4691
4692         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4693                 rtnl_unlock();
4694                 return 0;
4695         }
4696
4697         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4698                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4699                 addrconf_disable_change(net, newf);
4700         } else if ((!newf) ^ (!old))
4701                 dev_disable_change((struct inet6_dev *)table->extra1);
4702
4703         rtnl_unlock();
4704         return 0;
4705 }
4706
4707 static
4708 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4709                             void __user *buffer, size_t *lenp, loff_t *ppos)
4710 {
4711         int *valp = ctl->data;
4712         int val = *valp;
4713         loff_t pos = *ppos;
4714         ctl_table lctl;
4715         int ret;
4716
4717         /*
4718          * ctl->data points to idev->cnf.disable_ipv6, we should
4719          * not modify it until we get the rtnl lock.
4720          */
4721         lctl = *ctl;
4722         lctl.data = &val;
4723
4724         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4725
4726         if (write)
4727                 ret = addrconf_disable_ipv6(ctl, valp, val);
4728         if (ret)
4729                 *ppos = pos;
4730         return ret;
4731 }
4732
4733 static struct addrconf_sysctl_table
4734 {
4735         struct ctl_table_header *sysctl_header;
4736         ctl_table addrconf_vars[DEVCONF_MAX+1];
4737 } addrconf_sysctl __read_mostly = {
4738         .sysctl_header = NULL,
4739         .addrconf_vars = {
4740                 {
4741                         .procname       = "forwarding",
4742                         .data           = &ipv6_devconf.forwarding,
4743                         .maxlen         = sizeof(int),
4744                         .mode           = 0644,
4745                         .proc_handler   = addrconf_sysctl_forward,
4746                 },
4747                 {
4748                         .procname       = "hop_limit",
4749                         .data           = &ipv6_devconf.hop_limit,
4750                         .maxlen         = sizeof(int),
4751                         .mode           = 0644,
4752                         .proc_handler   = proc_dointvec,
4753                 },
4754                 {
4755                         .procname       = "mtu",
4756                         .data           = &ipv6_devconf.mtu6,
4757                         .maxlen         = sizeof(int),
4758                         .mode           = 0644,
4759                         .proc_handler   = proc_dointvec,
4760                 },
4761                 {
4762                         .procname       = "accept_ra",
4763                         .data           = &ipv6_devconf.accept_ra,
4764                         .maxlen         = sizeof(int),
4765                         .mode           = 0644,
4766                         .proc_handler   = proc_dointvec,
4767                 },
4768                 {
4769                         .procname       = "accept_redirects",
4770                         .data           = &ipv6_devconf.accept_redirects,
4771                         .maxlen         = sizeof(int),
4772                         .mode           = 0644,
4773                         .proc_handler   = proc_dointvec,
4774                 },
4775                 {
4776                         .procname       = "autoconf",
4777                         .data           = &ipv6_devconf.autoconf,
4778                         .maxlen         = sizeof(int),
4779                         .mode           = 0644,
4780                         .proc_handler   = proc_dointvec,
4781                 },
4782                 {
4783                         .procname       = "dad_transmits",
4784                         .data           = &ipv6_devconf.dad_transmits,
4785                         .maxlen         = sizeof(int),
4786                         .mode           = 0644,
4787                         .proc_handler   = proc_dointvec,
4788                 },
4789                 {
4790                         .procname       = "router_solicitations",
4791                         .data           = &ipv6_devconf.rtr_solicits,
4792                         .maxlen         = sizeof(int),
4793                         .mode           = 0644,
4794                         .proc_handler   = proc_dointvec,
4795                 },
4796                 {
4797                         .procname       = "router_solicitation_interval",
4798                         .data           = &ipv6_devconf.rtr_solicit_interval,
4799                         .maxlen         = sizeof(int),
4800                         .mode           = 0644,
4801                         .proc_handler   = proc_dointvec_jiffies,
4802                 },
4803                 {
4804                         .procname       = "router_solicitation_delay",
4805                         .data           = &ipv6_devconf.rtr_solicit_delay,
4806                         .maxlen         = sizeof(int),
4807                         .mode           = 0644,
4808                         .proc_handler   = proc_dointvec_jiffies,
4809                 },
4810                 {
4811                         .procname       = "force_mld_version",
4812                         .data           = &ipv6_devconf.force_mld_version,
4813                         .maxlen         = sizeof(int),
4814                         .mode           = 0644,
4815                         .proc_handler   = proc_dointvec,
4816                 },
4817 #ifdef CONFIG_IPV6_PRIVACY
4818                 {
4819                         .procname       = "use_tempaddr",
4820                         .data           = &ipv6_devconf.use_tempaddr,
4821                         .maxlen         = sizeof(int),
4822                         .mode           = 0644,
4823                         .proc_handler   = proc_dointvec,
4824                 },
4825                 {
4826                         .procname       = "temp_valid_lft",
4827                         .data           = &ipv6_devconf.temp_valid_lft,
4828                         .maxlen         = sizeof(int),
4829                         .mode           = 0644,
4830                         .proc_handler   = proc_dointvec,
4831                 },
4832                 {
4833                         .procname       = "temp_prefered_lft",
4834                         .data           = &ipv6_devconf.temp_prefered_lft,
4835                         .maxlen         = sizeof(int),
4836                         .mode           = 0644,
4837                         .proc_handler   = proc_dointvec,
4838                 },
4839                 {
4840                         .procname       = "regen_max_retry",
4841                         .data           = &ipv6_devconf.regen_max_retry,
4842                         .maxlen         = sizeof(int),
4843                         .mode           = 0644,
4844                         .proc_handler   = proc_dointvec,
4845                 },
4846                 {
4847                         .procname       = "max_desync_factor",
4848                         .data           = &ipv6_devconf.max_desync_factor,
4849                         .maxlen         = sizeof(int),
4850                         .mode           = 0644,
4851                         .proc_handler   = proc_dointvec,
4852                 },
4853 #endif
4854                 {
4855                         .procname       = "max_addresses",
4856                         .data           = &ipv6_devconf.max_addresses,
4857                         .maxlen         = sizeof(int),
4858                         .mode           = 0644,
4859                         .proc_handler   = proc_dointvec,
4860                 },
4861                 {
4862                         .procname       = "accept_ra_defrtr",
4863                         .data           = &ipv6_devconf.accept_ra_defrtr,
4864                         .maxlen         = sizeof(int),
4865                         .mode           = 0644,
4866                         .proc_handler   = proc_dointvec,
4867                 },
4868                 {
4869                         .procname       = "accept_ra_pinfo",
4870                         .data           = &ipv6_devconf.accept_ra_pinfo,
4871                         .maxlen         = sizeof(int),
4872                         .mode           = 0644,
4873                         .proc_handler   = proc_dointvec,
4874                 },
4875 #ifdef CONFIG_IPV6_ROUTER_PREF
4876                 {
4877                         .procname       = "accept_ra_rtr_pref",
4878                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4879                         .maxlen         = sizeof(int),
4880                         .mode           = 0644,
4881                         .proc_handler   = proc_dointvec,
4882                 },
4883                 {
4884                         .procname       = "router_probe_interval",
4885                         .data           = &ipv6_devconf.rtr_probe_interval,
4886                         .maxlen         = sizeof(int),
4887                         .mode           = 0644,
4888                         .proc_handler   = proc_dointvec_jiffies,
4889                 },
4890 #ifdef CONFIG_IPV6_ROUTE_INFO
4891                 {
4892                         .procname       = "accept_ra_rt_info_max_plen",
4893                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4894                         .maxlen         = sizeof(int),
4895                         .mode           = 0644,
4896                         .proc_handler   = proc_dointvec,
4897                 },
4898 #endif
4899 #endif
4900                 {
4901                         .procname       = "proxy_ndp",
4902                         .data           = &ipv6_devconf.proxy_ndp,
4903                         .maxlen         = sizeof(int),
4904                         .mode           = 0644,
4905                         .proc_handler   = proc_dointvec,
4906                 },
4907                 {
4908                         .procname       = "accept_source_route",
4909                         .data           = &ipv6_devconf.accept_source_route,
4910                         .maxlen         = sizeof(int),
4911                         .mode           = 0644,
4912                         .proc_handler   = proc_dointvec,
4913                 },
4914 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4915                 {
4916                         .procname       = "optimistic_dad",
4917                         .data           = &ipv6_devconf.optimistic_dad,
4918                         .maxlen         = sizeof(int),
4919                         .mode           = 0644,
4920                         .proc_handler   = proc_dointvec,
4921
4922                 },
4923 #endif
4924 #ifdef CONFIG_IPV6_MROUTE
4925                 {
4926                         .procname       = "mc_forwarding",
4927                         .data           = &ipv6_devconf.mc_forwarding,
4928                         .maxlen         = sizeof(int),
4929                         .mode           = 0444,
4930                         .proc_handler   = proc_dointvec,
4931                 },
4932 #endif
4933                 {
4934                         .procname       = "disable_ipv6",
4935                         .data           = &ipv6_devconf.disable_ipv6,
4936                         .maxlen         = sizeof(int),
4937                         .mode           = 0644,
4938                         .proc_handler   = addrconf_sysctl_disable,
4939                 },
4940                 {
4941                         .procname       = "accept_dad",
4942                         .data           = &ipv6_devconf.accept_dad,
4943                         .maxlen         = sizeof(int),
4944                         .mode           = 0644,
4945                         .proc_handler   = proc_dointvec,
4946                 },
4947                 {
4948                         .procname       = "force_tllao",
4949                         .data           = &ipv6_devconf.force_tllao,
4950                         .maxlen         = sizeof(int),
4951                         .mode           = 0644,
4952                         .proc_handler   = proc_dointvec
4953                 },
4954                 {
4955                         .procname       = "ndisc_notify",
4956                         .data           = &ipv6_devconf.ndisc_notify,
4957                         .maxlen         = sizeof(int),
4958                         .mode           = 0644,
4959                         .proc_handler   = proc_dointvec
4960                 },
4961                 {
4962                         /* sentinel */
4963                 }
4964         },
4965 };
4966
4967 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4968                 struct inet6_dev *idev, struct ipv6_devconf *p)
4969 {
4970         int i;
4971         struct addrconf_sysctl_table *t;
4972         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4973
4974         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4975         if (t == NULL)
4976                 goto out;
4977
4978         for (i = 0; t->addrconf_vars[i].data; i++) {
4979                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4980                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4981                 t->addrconf_vars[i].extra2 = net;
4982         }
4983
4984         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4985
4986         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4987         if (t->sysctl_header == NULL)
4988                 goto free;
4989
4990         p->sysctl = t;
4991         return 0;
4992
4993 free:
4994         kfree(t);
4995 out:
4996         return -ENOBUFS;
4997 }
4998
4999 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5000 {
5001         struct addrconf_sysctl_table *t;
5002
5003         if (p->sysctl == NULL)
5004                 return;
5005
5006         t = p->sysctl;
5007         p->sysctl = NULL;
5008         unregister_net_sysctl_table(t->sysctl_header);
5009         kfree(t);
5010 }
5011
5012 static void addrconf_sysctl_register(struct inet6_dev *idev)
5013 {
5014         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5015                               &ndisc_ifinfo_sysctl_change);
5016         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5017                                         idev, &idev->cnf);
5018 }
5019
5020 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5021 {
5022         __addrconf_sysctl_unregister(&idev->cnf);
5023         neigh_sysctl_unregister(idev->nd_parms);
5024 }
5025
5026
5027 #endif
5028
5029 static int __net_init addrconf_init_net(struct net *net)
5030 {
5031         int err = -ENOMEM;
5032         struct ipv6_devconf *all, *dflt;
5033
5034         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5035         if (all == NULL)
5036                 goto err_alloc_all;
5037
5038         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5039         if (dflt == NULL)
5040                 goto err_alloc_dflt;
5041
5042         /* these will be inherited by all namespaces */
5043         dflt->autoconf = ipv6_defaults.autoconf;
5044         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5045
5046         net->ipv6.devconf_all = all;
5047         net->ipv6.devconf_dflt = dflt;
5048
5049 #ifdef CONFIG_SYSCTL
5050         err = __addrconf_sysctl_register(net, "all", NULL, all);
5051         if (err < 0)
5052                 goto err_reg_all;
5053
5054         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5055         if (err < 0)
5056                 goto err_reg_dflt;
5057 #endif
5058         return 0;
5059
5060 #ifdef CONFIG_SYSCTL
5061 err_reg_dflt:
5062         __addrconf_sysctl_unregister(all);
5063 err_reg_all:
5064         kfree(dflt);
5065 #endif
5066 err_alloc_dflt:
5067         kfree(all);
5068 err_alloc_all:
5069         return err;
5070 }
5071
5072 static void __net_exit addrconf_exit_net(struct net *net)
5073 {
5074 #ifdef CONFIG_SYSCTL
5075         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5076         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5077 #endif
5078         if (!net_eq(net, &init_net)) {
5079                 kfree(net->ipv6.devconf_dflt);
5080                 kfree(net->ipv6.devconf_all);
5081         }
5082 }
5083
5084 static struct pernet_operations addrconf_ops = {
5085         .init = addrconf_init_net,
5086         .exit = addrconf_exit_net,
5087 };
5088
5089 static struct rtnl_af_ops inet6_ops = {
5090         .family           = AF_INET6,
5091         .fill_link_af     = inet6_fill_link_af,
5092         .get_link_af_size = inet6_get_link_af_size,
5093         .set_link_af      = inet6_set_link_af,
5094 };
5095
5096 /*
5097  *      Init / cleanup code
5098  */
5099
5100 int __init addrconf_init(void)
5101 {
5102         int i, err;
5103
5104         err = ipv6_addr_label_init();
5105         if (err < 0) {
5106                 pr_crit("%s: cannot initialize default policy table: %d\n",
5107                         __func__, err);
5108                 goto out;
5109         }
5110
5111         err = register_pernet_subsys(&addrconf_ops);
5112         if (err < 0)
5113                 goto out_addrlabel;
5114
5115         /* The addrconf netdev notifier requires that loopback_dev
5116          * has it's ipv6 private information allocated and setup
5117          * before it can bring up and give link-local addresses
5118          * to other devices which are up.
5119          *
5120          * Unfortunately, loopback_dev is not necessarily the first
5121          * entry in the global dev_base list of net devices.  In fact,
5122          * it is likely to be the very last entry on that list.
5123          * So this causes the notifier registry below to try and
5124          * give link-local addresses to all devices besides loopback_dev
5125          * first, then loopback_dev, which cases all the non-loopback_dev
5126          * devices to fail to get a link-local address.
5127          *
5128          * So, as a temporary fix, allocate the ipv6 structure for
5129          * loopback_dev first by hand.
5130          * Longer term, all of the dependencies ipv6 has upon the loopback
5131          * device and it being up should be removed.
5132          */
5133         rtnl_lock();
5134         if (!ipv6_add_dev(init_net.loopback_dev))
5135                 err = -ENOMEM;
5136         rtnl_unlock();
5137         if (err)
5138                 goto errlo;
5139
5140         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5141                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5142
5143         register_netdevice_notifier(&ipv6_dev_notf);
5144
5145         addrconf_verify(0);
5146
5147         err = rtnl_af_register(&inet6_ops);
5148         if (err < 0)
5149                 goto errout_af;
5150
5151         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5152                               NULL);
5153         if (err < 0)
5154                 goto errout;
5155
5156         /* Only the first call to __rtnl_register can fail */
5157         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5158         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5159         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5160                         inet6_dump_ifaddr, NULL);
5161         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5162                         inet6_dump_ifmcaddr, NULL);
5163         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5164                         inet6_dump_ifacaddr, NULL);
5165         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5166                         inet6_netconf_dump_devconf, NULL);
5167
5168         ipv6_addr_label_rtnl_register();
5169
5170         return 0;
5171 errout:
5172         rtnl_af_unregister(&inet6_ops);
5173 errout_af:
5174         unregister_netdevice_notifier(&ipv6_dev_notf);
5175 errlo:
5176         unregister_pernet_subsys(&addrconf_ops);
5177 out_addrlabel:
5178         ipv6_addr_label_cleanup();
5179 out:
5180         return err;
5181 }
5182
5183 void addrconf_cleanup(void)
5184 {
5185         struct net_device *dev;
5186         int i;
5187
5188         unregister_netdevice_notifier(&ipv6_dev_notf);
5189         unregister_pernet_subsys(&addrconf_ops);
5190         ipv6_addr_label_cleanup();
5191
5192         rtnl_lock();
5193
5194         __rtnl_af_unregister(&inet6_ops);
5195
5196         /* clean dev list */
5197         for_each_netdev(&init_net, dev) {
5198                 if (__in6_dev_get(dev) == NULL)
5199                         continue;
5200                 addrconf_ifdown(dev, 1);
5201         }
5202         addrconf_ifdown(init_net.loopback_dev, 2);
5203
5204         /*
5205          *      Check hash table.
5206          */
5207         spin_lock_bh(&addrconf_hash_lock);
5208         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5209                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5210         spin_unlock_bh(&addrconf_hash_lock);
5211
5212         del_timer(&addr_chk_timer);
5213         rtnl_unlock();
5214 }