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/inet.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_addr.h>
  53 #include <linux/if_arp.h>
  54 #include <linux/if_arcnet.h>
  55 #include <linux/if_infiniband.h>
  56 #include <linux/route.h>
  57 #include <linux/inetdevice.h>
  58 #include <linux/init.h>
  59 #include <linux/slab.h>
  60 #ifdef CONFIG_SYSCTL
  61 #include <linux/sysctl.h>
  62 #endif
  63 #include <linux/capability.h>
  64 #include <linux/delay.h>
  65 #include <linux/notifier.h>
  66 #include <linux/string.h>
  67 #include <linux/hash.h>
  68
  69 #include <net/net_namespace.h>
  70 #include <net/sock.h>
  71 #include <net/snmp.h>
  72
  73 #include <net/6lowpan.h>
  74 #include <net/firewire.h>
  75 #include <net/ipv6.h>
  76 #include <net/protocol.h>
  77 #include <net/ndisc.h>
  78 #include <net/ip6_route.h>
  79 #include <net/addrconf.h>
  80 #include <net/tcp.h>
  81 #include <net/ip.h>
  82 #include <net/netlink.h>
  83 #include <net/pkt_sched.h>
  84 #include <net/l3mdev.h>
  85 #include <linux/if_tunnel.h>
  86 #include <linux/rtnetlink.h>
  87 #include <linux/netconf.h>
  88 #include <linux/random.h>
  89 #include <linux/uaccess.h>
  90 #include <asm/unaligned.h>
  91
  92 #include <linux/proc_fs.h>
  93 #include <linux/seq_file.h>
  94 #include <linux/export.h>
  95
  96 /* Set to 3 to get tracing... */
  97 #define ACONF_DEBUG 2
  98
  99 #if ACONF_DEBUG >= 3
 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
 101 #else
 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 103 #endif
 104
 105 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 106
 107 #define IPV6_MAX_STRLEN \
 108         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
 109
 110 static inline u32 cstamp_delta(unsigned long cstamp)
 111 {
 112         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 113 }
 114
 115 #ifdef CONFIG_SYSCTL
 116 static int addrconf_sysctl_register(struct inet6_dev *idev);
 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 118 #else
 119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 120 {
 121         return 0;
 122 }
 123
 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 125 {
 126 }
 127 #endif
 128
 129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 131 static void ipv6_regen_rndid(unsigned long data);
 132
 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 134 static int ipv6_count_addresses(struct inet6_dev *idev);
 135 static int ipv6_generate_stable_address(struct in6_addr *addr,
 136                                         u8 dad_count,
 137                                         const struct inet6_dev *idev);
 138
 139 /*
 140  *      Configured unicast address hash table
 141  */
 142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 143 static DEFINE_SPINLOCK(addrconf_hash_lock);
 144
 145 static void addrconf_verify(void);
 146 static void addrconf_verify_rtnl(void);
 147 static void addrconf_verify_work(struct work_struct *);
 148
 149 static struct workqueue_struct *addrconf_wq;
 150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 151
 152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 154
 155 static void addrconf_type_change(struct net_device *dev,
 156                                  unsigned long event);
 157 static int addrconf_ifdown(struct net_device *dev, int how);
 158
 159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 160                                                   int plen,
 161                                                   const struct net_device *dev,
 162                                                   u32 flags, u32 noflags);
 163
 164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 165 static void addrconf_dad_work(struct work_struct *w);
 166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 167 static void addrconf_dad_run(struct inet6_dev *idev);
 168 static void addrconf_rs_timer(unsigned long data);
 169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 171
 172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 173                                 struct prefix_info *pinfo);
 174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 175                                struct net_device *dev);
 176
 177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 178         .forwarding             = 0,
 179         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 180         .mtu6                   = IPV6_MIN_MTU,
 181         .accept_ra              = 1,
 182         .accept_redirects       = 1,
 183         .autoconf               = 1,
 184         .force_mld_version      = 0,
 185         .mldv1_unsolicited_report_interval = 10 * HZ,
 186         .mldv2_unsolicited_report_interval = HZ,
 187         .dad_transmits          = 1,
 188         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 189         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 190         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 191         .use_tempaddr           = 0,
 192         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 193         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 194         .regen_max_retry        = REGEN_MAX_RETRY,
 195         .max_desync_factor      = MAX_DESYNC_FACTOR,
 196         .max_addresses          = IPV6_MAX_ADDRESSES,
 197         .accept_ra_defrtr       = 1,
 198         .accept_ra_from_local   = 0,
 199         .accept_ra_min_hop_limit= 1,
 200         .accept_ra_pinfo        = 1,
 201 #ifdef CONFIG_IPV6_ROUTER_PREF
 202         .accept_ra_rtr_pref     = 1,
 203         .rtr_probe_interval     = 60 * HZ,
 204 #ifdef CONFIG_IPV6_ROUTE_INFO
 205         .accept_ra_rt_info_max_plen = 0,
 206 #endif
 207 #endif
 208         .proxy_ndp              = 0,
 209         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 210         .disable_ipv6           = 0,
 211         .accept_dad             = 1,
 212         .suppress_frag_ndisc    = 1,
 213         .accept_ra_mtu          = 1,
 214         .stable_secret          = {
 215                 .initialized = false,
 216         },
 217         .use_oif_addrs_only     = 0,
 218         .ignore_routes_with_linkdown = 0,
 219         .keep_addr_on_down      = 0,
 220 };
 221
 222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 223         .forwarding             = 0,
 224         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 225         .mtu6                   = IPV6_MIN_MTU,
 226         .accept_ra              = 1,
 227         .accept_redirects       = 1,
 228         .autoconf               = 1,
 229         .force_mld_version      = 0,
 230         .mldv1_unsolicited_report_interval = 10 * HZ,
 231         .mldv2_unsolicited_report_interval = HZ,
 232         .dad_transmits          = 1,
 233         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 234         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 235         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 236         .use_tempaddr           = 0,
 237         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 238         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 239         .regen_max_retry        = REGEN_MAX_RETRY,
 240         .max_desync_factor      = MAX_DESYNC_FACTOR,
 241         .max_addresses          = IPV6_MAX_ADDRESSES,
 242         .accept_ra_defrtr       = 1,
 243         .accept_ra_from_local   = 0,
 244         .accept_ra_min_hop_limit= 1,
 245         .accept_ra_pinfo        = 1,
 246 #ifdef CONFIG_IPV6_ROUTER_PREF
 247         .accept_ra_rtr_pref     = 1,
 248         .rtr_probe_interval     = 60 * HZ,
 249 #ifdef CONFIG_IPV6_ROUTE_INFO
 250         .accept_ra_rt_info_max_plen = 0,
 251 #endif
 252 #endif
 253         .proxy_ndp              = 0,
 254         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 255         .disable_ipv6           = 0,
 256         .accept_dad             = 1,
 257         .suppress_frag_ndisc    = 1,
 258         .accept_ra_mtu          = 1,
 259         .stable_secret          = {
 260                 .initialized = false,
 261         },
 262         .use_oif_addrs_only     = 0,
 263         .ignore_routes_with_linkdown = 0,
 264         .keep_addr_on_down      = 0,
 265 };
 266
 267 /* Check if a valid qdisc is available */
 268 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 269 {
 270         return !qdisc_tx_is_noop(dev);
 271 }
 272
 273 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 274 {
 275         if (del_timer(&idev->rs_timer))
 276                 __in6_dev_put(idev);
 277 }
 278
 279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 280 {
 281         if (cancel_delayed_work(&ifp->dad_work))
 282                 __in6_ifa_put(ifp);
 283 }
 284
 285 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 286                                   unsigned long when)
 287 {
 288         if (!timer_pending(&idev->rs_timer))
 289                 in6_dev_hold(idev);
 290         mod_timer(&idev->rs_timer, jiffies + when);
 291 }
 292
 293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 294                                    unsigned long delay)
 295 {
 296         if (!delayed_work_pending(&ifp->dad_work))
 297                 in6_ifa_hold(ifp);
 298         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 299 }
 300
 301 static int snmp6_alloc_dev(struct inet6_dev *idev)
 302 {
 303         int i;
 304
 305         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 306         if (!idev->stats.ipv6)
 307                 goto err_ip;
 308
 309         for_each_possible_cpu(i) {
 310                 struct ipstats_mib *addrconf_stats;
 311                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 312                 u64_stats_init(&addrconf_stats->syncp);
 313         }
 314
 315
 316         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 317                                         GFP_KERNEL);
 318         if (!idev->stats.icmpv6dev)
 319                 goto err_icmp;
 320         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 321                                            GFP_KERNEL);
 322         if (!idev->stats.icmpv6msgdev)
 323                 goto err_icmpmsg;
 324
 325         return 0;
 326
 327 err_icmpmsg:
 328         kfree(idev->stats.icmpv6dev);
 329 err_icmp:
 330         free_percpu(idev->stats.ipv6);
 331 err_ip:
 332         return -ENOMEM;
 333 }
 334
 335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 336 {
 337         struct inet6_dev *ndev;
 338         int err = -ENOMEM;
 339
 340         ASSERT_RTNL();
 341
 342         if (dev->mtu < IPV6_MIN_MTU)
 343                 return ERR_PTR(-EINVAL);
 344
 345         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 346         if (!ndev)
 347                 return ERR_PTR(err);
 348
 349         rwlock_init(&ndev->lock);
 350         ndev->dev = dev;
 351         INIT_LIST_HEAD(&ndev->addr_list);
 352         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 353                     (unsigned long)ndev);
 354         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 355
 356         if (ndev->cnf.stable_secret.initialized)
 357                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 358         else
 359                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
 360
 361         ndev->cnf.mtu6 = dev->mtu;
 362         ndev->cnf.sysctl = NULL;
 363         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 364         if (!ndev->nd_parms) {
 365                 kfree(ndev);
 366                 return ERR_PTR(err);
 367         }
 368         if (ndev->cnf.forwarding)
 369                 dev_disable_lro(dev);
 370         /* We refer to the device */
 371         dev_hold(dev);
 372
 373         if (snmp6_alloc_dev(ndev) < 0) {
 374                 ADBG(KERN_WARNING
 375                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 376                         __func__, dev->name);
 377                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 378                 dev_put(dev);
 379                 kfree(ndev);
 380                 return ERR_PTR(err);
 381         }
 382
 383         if (snmp6_register_dev(ndev) < 0) {
 384                 ADBG(KERN_WARNING
 385                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 386                         __func__, dev->name);
 387                 goto err_release;
 388         }
 389
 390         /* One reference from device.  We must do this before
 391          * we invoke __ipv6_regen_rndid().
 392          */
 393         in6_dev_hold(ndev);
 394
 395         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 396                 ndev->cnf.accept_dad = -1;
 397
 398 #if IS_ENABLED(CONFIG_IPV6_SIT)
 399         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 400                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 401                 ndev->cnf.rtr_solicits = 0;
 402         }
 403 #endif
 404
 405         INIT_LIST_HEAD(&ndev->tempaddr_list);
 406         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 407         if ((dev->flags&IFF_LOOPBACK) ||
 408             dev->type == ARPHRD_TUNNEL ||
 409             dev->type == ARPHRD_TUNNEL6 ||
 410             dev->type == ARPHRD_SIT ||
 411             dev->type == ARPHRD_NONE) {
 412                 ndev->cnf.use_tempaddr = -1;
 413         } else {
 414                 in6_dev_hold(ndev);
 415                 ipv6_regen_rndid((unsigned long) ndev);
 416         }
 417
 418         ndev->token = in6addr_any;
 419
 420         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 421                 ndev->if_flags |= IF_READY;
 422
 423         ipv6_mc_init_dev(ndev);
 424         ndev->tstamp = jiffies;
 425         err = addrconf_sysctl_register(ndev);
 426         if (err) {
 427                 ipv6_mc_destroy_dev(ndev);
 428                 del_timer(&ndev->regen_timer);
 429                 snmp6_unregister_dev(ndev);
 430                 goto err_release;
 431         }
 432         /* protected by rtnl_lock */
 433         rcu_assign_pointer(dev->ip6_ptr, ndev);
 434
 435         /* Join interface-local all-node multicast group */
 436         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 437
 438         /* Join all-node multicast group */
 439         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 440
 441         /* Join all-router multicast group if forwarding is set */
 442         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 443                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 444
 445         return ndev;
 446
 447 err_release:
 448         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 449         ndev->dead = 1;
 450         in6_dev_finish_destroy(ndev);
 451         return ERR_PTR(err);
 452 }
 453
 454 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 455 {
 456         struct inet6_dev *idev;
 457
 458         ASSERT_RTNL();
 459
 460         idev = __in6_dev_get(dev);
 461         if (!idev) {
 462                 idev = ipv6_add_dev(dev);
 463                 if (IS_ERR(idev))
 464                         return NULL;
 465         }
 466
 467         if (dev->flags&IFF_UP)
 468                 ipv6_mc_up(idev);
 469         return idev;
 470 }
 471
 472 static int inet6_netconf_msgsize_devconf(int type)
 473 {
 474         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 475                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 476
 477         /* type -1 is used for ALL */
 478         if (type == -1 || type == NETCONFA_FORWARDING)
 479                 size += nla_total_size(4);
 480 #ifdef CONFIG_IPV6_MROUTE
 481         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 482                 size += nla_total_size(4);
 483 #endif
 484         if (type == -1 || type == NETCONFA_PROXY_NEIGH)
 485                 size += nla_total_size(4);
 486
 487         if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 488                 size += nla_total_size(4);
 489
 490         return size;
 491 }
 492
 493 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 494                                       struct ipv6_devconf *devconf, u32 portid,
 495                                       u32 seq, int event, unsigned int flags,
 496                                       int type)
 497 {
 498         struct nlmsghdr  *nlh;
 499         struct netconfmsg *ncm;
 500
 501         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 502                         flags);
 503         if (!nlh)
 504                 return -EMSGSIZE;
 505
 506         ncm = nlmsg_data(nlh);
 507         ncm->ncm_family = AF_INET6;
 508
 509         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 510                 goto nla_put_failure;
 511
 512         /* type -1 is used for ALL */
 513         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 514             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 515                 goto nla_put_failure;
 516 #ifdef CONFIG_IPV6_MROUTE
 517         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 518             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 519                         devconf->mc_forwarding) < 0)
 520                 goto nla_put_failure;
 521 #endif
 522         if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
 523             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 524                 goto nla_put_failure;
 525
 526         if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 527             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 528                         devconf->ignore_routes_with_linkdown) < 0)
 529                 goto nla_put_failure;
 530
 531         nlmsg_end(skb, nlh);
 532         return 0;
 533
 534 nla_put_failure:
 535         nlmsg_cancel(skb, nlh);
 536         return -EMSGSIZE;
 537 }
 538
 539 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 540                                   struct ipv6_devconf *devconf)
 541 {
 542         struct sk_buff *skb;
 543         int err = -ENOBUFS;
 544
 545         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 546         if (!skb)
 547                 goto errout;
 548
 549         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 550                                          RTM_NEWNETCONF, 0, type);
 551         if (err < 0) {
 552                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 553                 WARN_ON(err == -EMSGSIZE);
 554                 kfree_skb(skb);
 555                 goto errout;
 556         }
 557         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 558         return;
 559 errout:
 560         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 561 }
 562
 563 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 564         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 565         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 566         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 567         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 568 };
 569
 570 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 571                                      struct nlmsghdr *nlh)
 572 {
 573         struct net *net = sock_net(in_skb->sk);
 574         struct nlattr *tb[NETCONFA_MAX+1];
 575         struct netconfmsg *ncm;
 576         struct sk_buff *skb;
 577         struct ipv6_devconf *devconf;
 578         struct inet6_dev *in6_dev;
 579         struct net_device *dev;
 580         int ifindex;
 581         int err;
 582
 583         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 584                           devconf_ipv6_policy);
 585         if (err < 0)
 586                 goto errout;
 587
 588         err = -EINVAL;
 589         if (!tb[NETCONFA_IFINDEX])
 590                 goto errout;
 591
 592         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 593         switch (ifindex) {
 594         case NETCONFA_IFINDEX_ALL:
 595                 devconf = net->ipv6.devconf_all;
 596                 break;
 597         case NETCONFA_IFINDEX_DEFAULT:
 598                 devconf = net->ipv6.devconf_dflt;
 599                 break;
 600         default:
 601                 dev = __dev_get_by_index(net, ifindex);
 602                 if (!dev)
 603                         goto errout;
 604                 in6_dev = __in6_dev_get(dev);
 605                 if (!in6_dev)
 606                         goto errout;
 607                 devconf = &in6_dev->cnf;
 608                 break;
 609         }
 610
 611         err = -ENOBUFS;
 612         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 613         if (!skb)
 614                 goto errout;
 615
 616         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 617                                          NETLINK_CB(in_skb).portid,
 618                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 619                                          -1);
 620         if (err < 0) {
 621                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 622                 WARN_ON(err == -EMSGSIZE);
 623                 kfree_skb(skb);
 624                 goto errout;
 625         }
 626         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 627 errout:
 628         return err;
 629 }
 630
 631 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 632                                       struct netlink_callback *cb)
 633 {
 634         struct net *net = sock_net(skb->sk);
 635         int h, s_h;
 636         int idx, s_idx;
 637         struct net_device *dev;
 638         struct inet6_dev *idev;
 639         struct hlist_head *head;
 640
 641         s_h = cb->args[0];
 642         s_idx = idx = cb->args[1];
 643
 644         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 645                 idx = 0;
 646                 head = &net->dev_index_head[h];
 647                 rcu_read_lock();
 648                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 649                           net->dev_base_seq;
 650                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 651                         if (idx < s_idx)
 652                                 goto cont;
 653                         idev = __in6_dev_get(dev);
 654                         if (!idev)
 655                                 goto cont;
 656
 657                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 658                                                        &idev->cnf,
 659                                                        NETLINK_CB(cb->skb).portid,
 660                                                        cb->nlh->nlmsg_seq,
 661                                                        RTM_NEWNETCONF,
 662                                                        NLM_F_MULTI,
 663                                                        -1) < 0) {
 664                                 rcu_read_unlock();
 665                                 goto done;
 666                         }
 667                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 668 cont:
 669                         idx++;
 670                 }
 671                 rcu_read_unlock();
 672         }
 673         if (h == NETDEV_HASHENTRIES) {
 674                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 675                                                net->ipv6.devconf_all,
 676                                                NETLINK_CB(cb->skb).portid,
 677                                                cb->nlh->nlmsg_seq,
 678                                                RTM_NEWNETCONF, NLM_F_MULTI,
 679                                                -1) < 0)
 680                         goto done;
 681                 else
 682                         h++;
 683         }
 684         if (h == NETDEV_HASHENTRIES + 1) {
 685                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 686                                                net->ipv6.devconf_dflt,
 687                                                NETLINK_CB(cb->skb).portid,
 688                                                cb->nlh->nlmsg_seq,
 689                                                RTM_NEWNETCONF, NLM_F_MULTI,
 690                                                -1) < 0)
 691                         goto done;
 692                 else
 693                         h++;
 694         }
 695 done:
 696         cb->args[0] = h;
 697         cb->args[1] = idx;
 698
 699         return skb->len;
 700 }
 701
 702 #ifdef CONFIG_SYSCTL
 703 static void dev_forward_change(struct inet6_dev *idev)
 704 {
 705         struct net_device *dev;
 706         struct inet6_ifaddr *ifa;
 707
 708         if (!idev)
 709                 return;
 710         dev = idev->dev;
 711         if (idev->cnf.forwarding)
 712                 dev_disable_lro(dev);
 713         if (dev->flags & IFF_MULTICAST) {
 714                 if (idev->cnf.forwarding) {
 715                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 716                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 717                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 718                 } else {
 719                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 720                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 721                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 722                 }
 723         }
 724
 725         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 726                 if (ifa->flags&IFA_F_TENTATIVE)
 727                         continue;
 728                 if (idev->cnf.forwarding)
 729                         addrconf_join_anycast(ifa);
 730                 else
 731                         addrconf_leave_anycast(ifa);
 732         }
 733         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 734                                      dev->ifindex, &idev->cnf);
 735 }
 736
 737
 738 static void addrconf_forward_change(struct net *net, __s32 newf)
 739 {
 740         struct net_device *dev;
 741         struct inet6_dev *idev;
 742
 743         for_each_netdev(net, dev) {
 744                 idev = __in6_dev_get(dev);
 745                 if (idev) {
 746                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 747                         idev->cnf.forwarding = newf;
 748                         if (changed)
 749                                 dev_forward_change(idev);
 750                 }
 751         }
 752 }
 753
 754 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 755 {
 756         struct net *net;
 757         int old;
 758
 759         if (!rtnl_trylock())
 760                 return restart_syscall();
 761
 762         net = (struct net *)table->extra2;
 763         old = *p;
 764         *p = newf;
 765
 766         if (p == &net->ipv6.devconf_dflt->forwarding) {
 767                 if ((!newf) ^ (!old))
 768                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 769                                                      NETCONFA_IFINDEX_DEFAULT,
 770                                                      net->ipv6.devconf_dflt);
 771                 rtnl_unlock();
 772                 return 0;
 773         }
 774
 775         if (p == &net->ipv6.devconf_all->forwarding) {
 776                 net->ipv6.devconf_dflt->forwarding = newf;
 777                 addrconf_forward_change(net, newf);
 778                 if ((!newf) ^ (!old))
 779                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 780                                                      NETCONFA_IFINDEX_ALL,
 781                                                      net->ipv6.devconf_all);
 782         } else if ((!newf) ^ (!old))
 783                 dev_forward_change((struct inet6_dev *)table->extra1);
 784         rtnl_unlock();
 785
 786         if (newf)
 787                 rt6_purge_dflt_routers(net);
 788         return 1;
 789 }
 790
 791 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 792 {
 793         struct net_device *dev;
 794         struct inet6_dev *idev;
 795
 796         for_each_netdev(net, dev) {
 797                 idev = __in6_dev_get(dev);
 798                 if (idev) {
 799                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 800
 801                         idev->cnf.ignore_routes_with_linkdown = newf;
 802                         if (changed)
 803                                 inet6_netconf_notify_devconf(dev_net(dev),
 804                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 805                                                              dev->ifindex,
 806                                                              &idev->cnf);
 807                 }
 808         }
 809 }
 810
 811 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 812 {
 813         struct net *net;
 814         int old;
 815
 816         if (!rtnl_trylock())
 817                 return restart_syscall();
 818
 819         net = (struct net *)table->extra2;
 820         old = *p;
 821         *p = newf;
 822
 823         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 824                 if ((!newf) ^ (!old))
 825                         inet6_netconf_notify_devconf(net,
 826                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 827                                                      NETCONFA_IFINDEX_DEFAULT,
 828                                                      net->ipv6.devconf_dflt);
 829                 rtnl_unlock();
 830                 return 0;
 831         }
 832
 833         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 834                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 835                 addrconf_linkdown_change(net, newf);
 836                 if ((!newf) ^ (!old))
 837                         inet6_netconf_notify_devconf(net,
 838                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 839                                                      NETCONFA_IFINDEX_ALL,
 840                                                      net->ipv6.devconf_all);
 841         }
 842         rtnl_unlock();
 843
 844         return 1;
 845 }
 846
 847 #endif
 848
 849 /* Nobody refers to this ifaddr, destroy it */
 850 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 851 {
 852         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 853
 854 #ifdef NET_REFCNT_DEBUG
 855         pr_debug("%s\n", __func__);
 856 #endif
 857
 858         in6_dev_put(ifp->idev);
 859
 860         if (cancel_delayed_work(&ifp->dad_work))
 861                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 862                           ifp);
 863
 864         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 865                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 866                 return;
 867         }
 868         ip6_rt_put(ifp->rt);
 869
 870         kfree_rcu(ifp, rcu);
 871 }
 872
 873 static void
 874 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 875 {
 876         struct list_head *p;
 877         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 878
 879         /*
 880          * Each device address list is sorted in order of scope -
 881          * global before linklocal.
 882          */
 883         list_for_each(p, &idev->addr_list) {
 884                 struct inet6_ifaddr *ifa
 885                         = list_entry(p, struct inet6_ifaddr, if_list);
 886                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 887                         break;
 888         }
 889
 890         list_add_tail(&ifp->if_list, p);
 891 }
 892
 893 static u32 inet6_addr_hash(const struct in6_addr *addr)
 894 {
 895         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 896 }
 897
 898 /* On success it returns ifp with increased reference count */
 899
 900 static struct inet6_ifaddr *
 901 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 902               const struct in6_addr *peer_addr, int pfxlen,
 903               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 904 {
 905         struct inet6_ifaddr *ifa = NULL;
 906         struct rt6_info *rt;
 907         unsigned int hash;
 908         int err = 0;
 909         int addr_type = ipv6_addr_type(addr);
 910
 911         if (addr_type == IPV6_ADDR_ANY ||
 912             addr_type & IPV6_ADDR_MULTICAST ||
 913             (!(idev->dev->flags & IFF_LOOPBACK) &&
 914              addr_type & IPV6_ADDR_LOOPBACK))
 915                 return ERR_PTR(-EADDRNOTAVAIL);
 916
 917         rcu_read_lock_bh();
 918         if (idev->dead) {
 919                 err = -ENODEV;                  /*XXX*/
 920                 goto out2;
 921         }
 922
 923         if (idev->cnf.disable_ipv6) {
 924                 err = -EACCES;
 925                 goto out2;
 926         }
 927
 928         spin_lock(&addrconf_hash_lock);
 929
 930         /* Ignore adding duplicate addresses on an interface */
 931         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 932                 ADBG("ipv6_add_addr: already assigned\n");
 933                 err = -EEXIST;
 934                 goto out;
 935         }
 936
 937         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 938
 939         if (!ifa) {
 940                 ADBG("ipv6_add_addr: malloc failed\n");
 941                 err = -ENOBUFS;
 942                 goto out;
 943         }
 944
 945         rt = addrconf_dst_alloc(idev, addr, false);
 946         if (IS_ERR(rt)) {
 947                 err = PTR_ERR(rt);
 948                 goto out;
 949         }
 950
 951         neigh_parms_data_state_setall(idev->nd_parms);
 952
 953         ifa->addr = *addr;
 954         if (peer_addr)
 955                 ifa->peer_addr = *peer_addr;
 956
 957         spin_lock_init(&ifa->lock);
 958         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 959         INIT_HLIST_NODE(&ifa->addr_lst);
 960         ifa->scope = scope;
 961         ifa->prefix_len = pfxlen;
 962         ifa->flags = flags | IFA_F_TENTATIVE;
 963         ifa->valid_lft = valid_lft;
 964         ifa->prefered_lft = prefered_lft;
 965         ifa->cstamp = ifa->tstamp = jiffies;
 966         ifa->tokenized = false;
 967
 968         ifa->rt = rt;
 969
 970         ifa->idev = idev;
 971         in6_dev_hold(idev);
 972         /* For caller */
 973         in6_ifa_hold(ifa);
 974
 975         /* Add to big hash table */
 976         hash = inet6_addr_hash(addr);
 977
 978         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 979         spin_unlock(&addrconf_hash_lock);
 980
 981         write_lock(&idev->lock);
 982         /* Add to inet6_dev unicast addr list. */
 983         ipv6_link_dev_addr(idev, ifa);
 984
 985         if (ifa->flags&IFA_F_TEMPORARY) {
 986                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 987                 in6_ifa_hold(ifa);
 988         }
 989
 990         in6_ifa_hold(ifa);
 991         write_unlock(&idev->lock);
 992 out2:
 993         rcu_read_unlock_bh();
 994
 995         if (likely(err == 0))
 996                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 997         else {
 998                 kfree(ifa);
 999                 ifa = ERR_PTR(err);
1000         }
1001
1002         return ifa;
1003 out:
1004         spin_unlock(&addrconf_hash_lock);
1005         goto out2;
1006 }
1007
1008 enum cleanup_prefix_rt_t {
1009         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1010         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1011         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1012 };
1013
1014 /*
1015  * Check, whether the prefix for ifp would still need a prefix route
1016  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1017  * constants.
1018  *
1019  * 1) we don't purge prefix if address was not permanent.
1020  *    prefix is managed by its own lifetime.
1021  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1022  * 3) if there are no addresses, delete prefix.
1023  * 4) if there are still other permanent address(es),
1024  *    corresponding prefix is still permanent.
1025  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1026  *    don't purge the prefix, assume user space is managing it.
1027  * 6) otherwise, update prefix lifetime to the
1028  *    longest valid lifetime among the corresponding
1029  *    addresses on the device.
1030  *    Note: subsequent RA will update lifetime.
1031  **/
1032 static enum cleanup_prefix_rt_t
1033 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1034 {
1035         struct inet6_ifaddr *ifa;
1036         struct inet6_dev *idev = ifp->idev;
1037         unsigned long lifetime;
1038         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1039
1040         *expires = jiffies;
1041
1042         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1043                 if (ifa == ifp)
1044                         continue;
1045                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1046                                        ifp->prefix_len))
1047                         continue;
1048                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1049                         return CLEANUP_PREFIX_RT_NOP;
1050
1051                 action = CLEANUP_PREFIX_RT_EXPIRE;
1052
1053                 spin_lock(&ifa->lock);
1054
1055                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1056                 /*
1057                  * Note: Because this address is
1058                  * not permanent, lifetime <
1059                  * LONG_MAX / HZ here.
1060                  */
1061                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1062                         *expires = ifa->tstamp + lifetime * HZ;
1063                 spin_unlock(&ifa->lock);
1064         }
1065
1066         return action;
1067 }
1068
1069 static void
1070 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1071 {
1072         struct rt6_info *rt;
1073
1074         rt = addrconf_get_prefix_route(&ifp->addr,
1075                                        ifp->prefix_len,
1076                                        ifp->idev->dev,
1077                                        0, RTF_GATEWAY | RTF_DEFAULT);
1078         if (rt) {
1079                 if (del_rt)
1080                         ip6_del_rt(rt);
1081                 else {
1082                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1083                                 rt6_set_expires(rt, expires);
1084                         ip6_rt_put(rt);
1085                 }
1086         }
1087 }
1088
1089
1090 /* This function wants to get referenced ifp and releases it before return */
1091
1092 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1093 {
1094         int state;
1095         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1096         unsigned long expires;
1097
1098         ASSERT_RTNL();
1099
1100         spin_lock_bh(&ifp->lock);
1101         state = ifp->state;
1102         ifp->state = INET6_IFADDR_STATE_DEAD;
1103         spin_unlock_bh(&ifp->lock);
1104
1105         if (state == INET6_IFADDR_STATE_DEAD)
1106                 goto out;
1107
1108         spin_lock_bh(&addrconf_hash_lock);
1109         hlist_del_init_rcu(&ifp->addr_lst);
1110         spin_unlock_bh(&addrconf_hash_lock);
1111
1112         write_lock_bh(&ifp->idev->lock);
1113
1114         if (ifp->flags&IFA_F_TEMPORARY) {
1115                 list_del(&ifp->tmp_list);
1116                 if (ifp->ifpub) {
1117                         in6_ifa_put(ifp->ifpub);
1118                         ifp->ifpub = NULL;
1119                 }
1120                 __in6_ifa_put(ifp);
1121         }
1122
1123         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1124                 action = check_cleanup_prefix_route(ifp, &expires);
1125
1126         list_del_init(&ifp->if_list);
1127         __in6_ifa_put(ifp);
1128
1129         write_unlock_bh(&ifp->idev->lock);
1130
1131         addrconf_del_dad_work(ifp);
1132
1133         ipv6_ifa_notify(RTM_DELADDR, ifp);
1134
1135         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1136
1137         if (action != CLEANUP_PREFIX_RT_NOP) {
1138                 cleanup_prefix_route(ifp, expires,
1139                         action == CLEANUP_PREFIX_RT_DEL);
1140         }
1141
1142         /* clean up prefsrc entries */
1143         rt6_remove_prefsrc(ifp);
1144 out:
1145         in6_ifa_put(ifp);
1146 }
1147
1148 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1149 {
1150         struct inet6_dev *idev = ifp->idev;
1151         struct in6_addr addr, *tmpaddr;
1152         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1153         unsigned long regen_advance;
1154         int tmp_plen;
1155         int ret = 0;
1156         u32 addr_flags;
1157         unsigned long now = jiffies;
1158
1159         write_lock_bh(&idev->lock);
1160         if (ift) {
1161                 spin_lock_bh(&ift->lock);
1162                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1163                 spin_unlock_bh(&ift->lock);
1164                 tmpaddr = &addr;
1165         } else {
1166                 tmpaddr = NULL;
1167         }
1168 retry:
1169         in6_dev_hold(idev);
1170         if (idev->cnf.use_tempaddr <= 0) {
1171                 write_unlock_bh(&idev->lock);
1172                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1173                 in6_dev_put(idev);
1174                 ret = -1;
1175                 goto out;
1176         }
1177         spin_lock_bh(&ifp->lock);
1178         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1179                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1180                 spin_unlock_bh(&ifp->lock);
1181                 write_unlock_bh(&idev->lock);
1182                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1183                         __func__);
1184                 in6_dev_put(idev);
1185                 ret = -1;
1186                 goto out;
1187         }
1188         in6_ifa_hold(ifp);
1189         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1190         __ipv6_try_regen_rndid(idev, tmpaddr);
1191         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1192         age = (now - ifp->tstamp) / HZ;
1193         tmp_valid_lft = min_t(__u32,
1194                               ifp->valid_lft,
1195                               idev->cnf.temp_valid_lft + age);
1196         tmp_prefered_lft = min_t(__u32,
1197                                  ifp->prefered_lft,
1198                                  idev->cnf.temp_prefered_lft + age -
1199                                  idev->cnf.max_desync_factor);
1200         tmp_plen = ifp->prefix_len;
1201         tmp_tstamp = ifp->tstamp;
1202         spin_unlock_bh(&ifp->lock);
1203
1204         regen_advance = idev->cnf.regen_max_retry *
1205                         idev->cnf.dad_transmits *
1206                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1207         write_unlock_bh(&idev->lock);
1208
1209         /* A temporary address is created only if this calculated Preferred
1210          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1211          * an implementation must not create a temporary address with a zero
1212          * Preferred Lifetime.
1213          * Use age calculation as in addrconf_verify to avoid unnecessary
1214          * temporary addresses being generated.
1215          */
1216         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1217         if (tmp_prefered_lft <= regen_advance + age) {
1218                 in6_ifa_put(ifp);
1219                 in6_dev_put(idev);
1220                 ret = -1;
1221                 goto out;
1222         }
1223
1224         addr_flags = IFA_F_TEMPORARY;
1225         /* set in addrconf_prefix_rcv() */
1226         if (ifp->flags & IFA_F_OPTIMISTIC)
1227                 addr_flags |= IFA_F_OPTIMISTIC;
1228
1229         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1230                             ipv6_addr_scope(&addr), addr_flags,
1231                             tmp_valid_lft, tmp_prefered_lft);
1232         if (IS_ERR(ift)) {
1233                 in6_ifa_put(ifp);
1234                 in6_dev_put(idev);
1235                 pr_info("%s: retry temporary address regeneration\n", __func__);
1236                 tmpaddr = &addr;
1237                 write_lock_bh(&idev->lock);
1238                 goto retry;
1239         }
1240
1241         spin_lock_bh(&ift->lock);
1242         ift->ifpub = ifp;
1243         ift->cstamp = now;
1244         ift->tstamp = tmp_tstamp;
1245         spin_unlock_bh(&ift->lock);
1246
1247         addrconf_dad_start(ift);
1248         in6_ifa_put(ift);
1249         in6_dev_put(idev);
1250 out:
1251         return ret;
1252 }
1253
1254 /*
1255  *      Choose an appropriate source address (RFC3484)
1256  */
1257 enum {
1258         IPV6_SADDR_RULE_INIT = 0,
1259         IPV6_SADDR_RULE_LOCAL,
1260         IPV6_SADDR_RULE_SCOPE,
1261         IPV6_SADDR_RULE_PREFERRED,
1262 #ifdef CONFIG_IPV6_MIP6
1263         IPV6_SADDR_RULE_HOA,
1264 #endif
1265         IPV6_SADDR_RULE_OIF,
1266         IPV6_SADDR_RULE_LABEL,
1267         IPV6_SADDR_RULE_PRIVACY,
1268         IPV6_SADDR_RULE_ORCHID,
1269         IPV6_SADDR_RULE_PREFIX,
1270 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1271         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1272 #endif
1273         IPV6_SADDR_RULE_MAX
1274 };
1275
1276 struct ipv6_saddr_score {
1277         int                     rule;
1278         int                     addr_type;
1279         struct inet6_ifaddr     *ifa;
1280         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1281         int                     scopedist;
1282         int                     matchlen;
1283 };
1284
1285 struct ipv6_saddr_dst {
1286         const struct in6_addr *addr;
1287         int ifindex;
1288         int scope;
1289         int label;
1290         unsigned int prefs;
1291 };
1292
1293 static inline int ipv6_saddr_preferred(int type)
1294 {
1295         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1296                 return 1;
1297         return 0;
1298 }
1299
1300 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1301 {
1302 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1303         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1304 #else
1305         return false;
1306 #endif
1307 }
1308
1309 static int ipv6_get_saddr_eval(struct net *net,
1310                                struct ipv6_saddr_score *score,
1311                                struct ipv6_saddr_dst *dst,
1312                                int i)
1313 {
1314         int ret;
1315
1316         if (i <= score->rule) {
1317                 switch (i) {
1318                 case IPV6_SADDR_RULE_SCOPE:
1319                         ret = score->scopedist;
1320                         break;
1321                 case IPV6_SADDR_RULE_PREFIX:
1322                         ret = score->matchlen;
1323                         break;
1324                 default:
1325                         ret = !!test_bit(i, score->scorebits);
1326                 }
1327                 goto out;
1328         }
1329
1330         switch (i) {
1331         case IPV6_SADDR_RULE_INIT:
1332                 /* Rule 0: remember if hiscore is not ready yet */
1333                 ret = !!score->ifa;
1334                 break;
1335         case IPV6_SADDR_RULE_LOCAL:
1336                 /* Rule 1: Prefer same address */
1337                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1338                 break;
1339         case IPV6_SADDR_RULE_SCOPE:
1340                 /* Rule 2: Prefer appropriate scope
1341                  *
1342                  *      ret
1343                  *       ^
1344                  *    -1 |  d 15
1345                  *    ---+--+-+---> scope
1346                  *       |
1347                  *       |             d is scope of the destination.
1348                  *  B-d  |  \
1349                  *       |   \      <- smaller scope is better if
1350                  *  B-15 |    \        if scope is enough for destination.
1351                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1352                  * d-C-1 | /
1353                  *       |/         <- greater is better
1354                  *   -C  /             if scope is not enough for destination.
1355                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1356                  *
1357                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1358                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1359                  * Assume B = 0 and we get C > 29.
1360                  */
1361                 ret = __ipv6_addr_src_scope(score->addr_type);
1362                 if (ret >= dst->scope)
1363                         ret = -ret;
1364                 else
1365                         ret -= 128;     /* 30 is enough */
1366                 score->scopedist = ret;
1367                 break;
1368         case IPV6_SADDR_RULE_PREFERRED:
1369             {
1370                 /* Rule 3: Avoid deprecated and optimistic addresses */
1371                 u8 avoid = IFA_F_DEPRECATED;
1372
1373                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1374                         avoid |= IFA_F_OPTIMISTIC;
1375                 ret = ipv6_saddr_preferred(score->addr_type) ||
1376                       !(score->ifa->flags & avoid);
1377                 break;
1378             }
1379 #ifdef CONFIG_IPV6_MIP6
1380         case IPV6_SADDR_RULE_HOA:
1381             {
1382                 /* Rule 4: Prefer home address */
1383                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1384                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1385                 break;
1386             }
1387 #endif
1388         case IPV6_SADDR_RULE_OIF:
1389                 /* Rule 5: Prefer outgoing interface */
1390                 ret = (!dst->ifindex ||
1391                        dst->ifindex == score->ifa->idev->dev->ifindex);
1392                 break;
1393         case IPV6_SADDR_RULE_LABEL:
1394                 /* Rule 6: Prefer matching label */
1395                 ret = ipv6_addr_label(net,
1396                                       &score->ifa->addr, score->addr_type,
1397                                       score->ifa->idev->dev->ifindex) == dst->label;
1398                 break;
1399         case IPV6_SADDR_RULE_PRIVACY:
1400             {
1401                 /* Rule 7: Prefer public address
1402                  * Note: prefer temporary address if use_tempaddr >= 2
1403                  */
1404                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1405                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1406                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1407                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1408                 break;
1409             }
1410         case IPV6_SADDR_RULE_ORCHID:
1411                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1412                  *          non-ORCHID vs non-ORCHID
1413                  */
1414                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1415                         ipv6_addr_orchid(dst->addr));
1416                 break;
1417         case IPV6_SADDR_RULE_PREFIX:
1418                 /* Rule 8: Use longest matching prefix */
1419                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1420                 if (ret > score->ifa->prefix_len)
1421                         ret = score->ifa->prefix_len;
1422                 score->matchlen = ret;
1423                 break;
1424 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1425         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1426                 /* Optimistic addresses still have lower precedence than other
1427                  * preferred addresses.
1428                  */
1429                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1430                 break;
1431 #endif
1432         default:
1433                 ret = 0;
1434         }
1435
1436         if (ret)
1437                 __set_bit(i, score->scorebits);
1438         score->rule = i;
1439 out:
1440         return ret;
1441 }
1442
1443 static int __ipv6_dev_get_saddr(struct net *net,
1444                                 struct ipv6_saddr_dst *dst,
1445                                 struct inet6_dev *idev,
1446                                 struct ipv6_saddr_score *scores,
1447                                 int hiscore_idx)
1448 {
1449         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1450
1451         read_lock_bh(&idev->lock);
1452         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1453                 int i;
1454
1455                 /*
1456                  * - Tentative Address (RFC2462 section 5.4)
1457                  *  - A tentative address is not considered
1458                  *    "assigned to an interface" in the traditional
1459                  *    sense, unless it is also flagged as optimistic.
1460                  * - Candidate Source Address (section 4)
1461                  *  - In any case, anycast addresses, multicast
1462                  *    addresses, and the unspecified address MUST
1463                  *    NOT be included in a candidate set.
1464                  */
1465                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1466                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1467                         continue;
1468
1469                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1470
1471                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1472                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1473                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1474                                             idev->dev->name);
1475                         continue;
1476                 }
1477
1478                 score->rule = -1;
1479                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1480
1481                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1482                         int minihiscore, miniscore;
1483
1484                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1485                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1486
1487                         if (minihiscore > miniscore) {
1488                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1489                                     score->scopedist > 0) {
1490                                         /*
1491                                          * special case:
1492                                          * each remaining entry
1493                                          * has too small (not enough)
1494                                          * scope, because ifa entries
1495                                          * are sorted by their scope
1496                                          * values.
1497                                          */
1498                                         goto out;
1499                                 }
1500                                 break;
1501                         } else if (minihiscore < miniscore) {
1502                                 if (hiscore->ifa)
1503                                         in6_ifa_put(hiscore->ifa);
1504
1505                                 in6_ifa_hold(score->ifa);
1506
1507                                 swap(hiscore, score);
1508                                 hiscore_idx = 1 - hiscore_idx;
1509
1510                                 /* restore our iterator */
1511                                 score->ifa = hiscore->ifa;
1512
1513                                 break;
1514                         }
1515                 }
1516         }
1517 out:
1518         read_unlock_bh(&idev->lock);
1519         return hiscore_idx;
1520 }
1521
1522 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1523                        const struct in6_addr *daddr, unsigned int prefs,
1524                        struct in6_addr *saddr)
1525 {
1526         struct ipv6_saddr_score scores[2], *hiscore;
1527         struct ipv6_saddr_dst dst;
1528         struct inet6_dev *idev;
1529         struct net_device *dev;
1530         int dst_type;
1531         bool use_oif_addr = false;
1532         int hiscore_idx = 0;
1533
1534         dst_type = __ipv6_addr_type(daddr);
1535         dst.addr = daddr;
1536         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1537         dst.scope = __ipv6_addr_src_scope(dst_type);
1538         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1539         dst.prefs = prefs;
1540
1541         scores[hiscore_idx].rule = -1;
1542         scores[hiscore_idx].ifa = NULL;
1543
1544         rcu_read_lock();
1545
1546         /* Candidate Source Address (section 4)
1547          *  - multicast and link-local destination address,
1548          *    the set of candidate source address MUST only
1549          *    include addresses assigned to interfaces
1550          *    belonging to the same link as the outgoing
1551          *    interface.
1552          * (- For site-local destination addresses, the
1553          *    set of candidate source addresses MUST only
1554          *    include addresses assigned to interfaces
1555          *    belonging to the same site as the outgoing
1556          *    interface.)
1557          *  - "It is RECOMMENDED that the candidate source addresses
1558          *    be the set of unicast addresses assigned to the
1559          *    interface that will be used to send to the destination
1560          *    (the 'outgoing' interface)." (RFC 6724)
1561          */
1562         if (dst_dev) {
1563                 idev = __in6_dev_get(dst_dev);
1564                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1565                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1566                     (idev && idev->cnf.use_oif_addrs_only)) {
1567                         use_oif_addr = true;
1568                 }
1569         }
1570
1571         if (use_oif_addr) {
1572                 if (idev)
1573                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1574         } else {
1575                 for_each_netdev_rcu(net, dev) {
1576                         idev = __in6_dev_get(dev);
1577                         if (!idev)
1578                                 continue;
1579                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1580                 }
1581         }
1582         rcu_read_unlock();
1583
1584         hiscore = &scores[hiscore_idx];
1585         if (!hiscore->ifa)
1586                 return -EADDRNOTAVAIL;
1587
1588         *saddr = hiscore->ifa->addr;
1589         in6_ifa_put(hiscore->ifa);
1590         return 0;
1591 }
1592 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1593
1594 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1595                       u32 banned_flags)
1596 {
1597         struct inet6_ifaddr *ifp;
1598         int err = -EADDRNOTAVAIL;
1599
1600         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1601                 if (ifp->scope > IFA_LINK)
1602                         break;
1603                 if (ifp->scope == IFA_LINK &&
1604                     !(ifp->flags & banned_flags)) {
1605                         *addr = ifp->addr;
1606                         err = 0;
1607                         break;
1608                 }
1609         }
1610         return err;
1611 }
1612
1613 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1614                     u32 banned_flags)
1615 {
1616         struct inet6_dev *idev;
1617         int err = -EADDRNOTAVAIL;
1618
1619         rcu_read_lock();
1620         idev = __in6_dev_get(dev);
1621         if (idev) {
1622                 read_lock_bh(&idev->lock);
1623                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1624                 read_unlock_bh(&idev->lock);
1625         }
1626         rcu_read_unlock();
1627         return err;
1628 }
1629
1630 static int ipv6_count_addresses(struct inet6_dev *idev)
1631 {
1632         int cnt = 0;
1633         struct inet6_ifaddr *ifp;
1634
1635         read_lock_bh(&idev->lock);
1636         list_for_each_entry(ifp, &idev->addr_list, if_list)
1637                 cnt++;
1638         read_unlock_bh(&idev->lock);
1639         return cnt;
1640 }
1641
1642 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1643                   const struct net_device *dev, int strict)
1644 {
1645         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1646 }
1647 EXPORT_SYMBOL(ipv6_chk_addr);
1648
1649 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1650                             const struct net_device *dev, int strict,
1651                             u32 banned_flags)
1652 {
1653         struct inet6_ifaddr *ifp;
1654         unsigned int hash = inet6_addr_hash(addr);
1655         u32 ifp_flags;
1656
1657         rcu_read_lock_bh();
1658         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1659                 if (!net_eq(dev_net(ifp->idev->dev), net))
1660                         continue;
1661                 /* Decouple optimistic from tentative for evaluation here.
1662                  * Ban optimistic addresses explicitly, when required.
1663                  */
1664                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1665                             ? (ifp->flags&~IFA_F_TENTATIVE)
1666                             : ifp->flags;
1667                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1668                     !(ifp_flags&banned_flags) &&
1669                     (!dev || ifp->idev->dev == dev ||
1670                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1671                         rcu_read_unlock_bh();
1672                         return 1;
1673                 }
1674         }
1675
1676         rcu_read_unlock_bh();
1677         return 0;
1678 }
1679 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1680
1681 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1682                                struct net_device *dev)
1683 {
1684         unsigned int hash = inet6_addr_hash(addr);
1685         struct inet6_ifaddr *ifp;
1686
1687         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1688                 if (!net_eq(dev_net(ifp->idev->dev), net))
1689                         continue;
1690                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1691                         if (!dev || ifp->idev->dev == dev)
1692                                 return true;
1693                 }
1694         }
1695         return false;
1696 }
1697
1698 /* Compares an address/prefix_len with addresses on device @dev.
1699  * If one is found it returns true.
1700  */
1701 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1702         const unsigned int prefix_len, struct net_device *dev)
1703 {
1704         struct inet6_dev *idev;
1705         struct inet6_ifaddr *ifa;
1706         bool ret = false;
1707
1708         rcu_read_lock();
1709         idev = __in6_dev_get(dev);
1710         if (idev) {
1711                 read_lock_bh(&idev->lock);
1712                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1713                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1714                         if (ret)
1715                                 break;
1716                 }
1717                 read_unlock_bh(&idev->lock);
1718         }
1719         rcu_read_unlock();
1720
1721         return ret;
1722 }
1723 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1724
1725 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1726 {
1727         struct inet6_dev *idev;
1728         struct inet6_ifaddr *ifa;
1729         int     onlink;
1730
1731         onlink = 0;
1732         rcu_read_lock();
1733         idev = __in6_dev_get(dev);
1734         if (idev) {
1735                 read_lock_bh(&idev->lock);
1736                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1737                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1738                                                    ifa->prefix_len);
1739                         if (onlink)
1740                                 break;
1741                 }
1742                 read_unlock_bh(&idev->lock);
1743         }
1744         rcu_read_unlock();
1745         return onlink;
1746 }
1747 EXPORT_SYMBOL(ipv6_chk_prefix);
1748
1749 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1750                                      struct net_device *dev, int strict)
1751 {
1752         struct inet6_ifaddr *ifp, *result = NULL;
1753         unsigned int hash = inet6_addr_hash(addr);
1754
1755         rcu_read_lock_bh();
1756         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1757                 if (!net_eq(dev_net(ifp->idev->dev), net))
1758                         continue;
1759                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1760                         if (!dev || ifp->idev->dev == dev ||
1761                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1762                                 result = ifp;
1763                                 in6_ifa_hold(ifp);
1764                                 break;
1765                         }
1766                 }
1767         }
1768         rcu_read_unlock_bh();
1769
1770         return result;
1771 }
1772
1773 /* Gets referenced address, destroys ifaddr */
1774
1775 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1776 {
1777         if (dad_failed)
1778                 ifp->flags |= IFA_F_DADFAILED;
1779
1780         if (ifp->flags&IFA_F_PERMANENT) {
1781                 spin_lock_bh(&ifp->lock);
1782                 addrconf_del_dad_work(ifp);
1783                 ifp->flags |= IFA_F_TENTATIVE;
1784                 spin_unlock_bh(&ifp->lock);
1785                 if (dad_failed)
1786                         ipv6_ifa_notify(0, ifp);
1787                 in6_ifa_put(ifp);
1788         } else if (ifp->flags&IFA_F_TEMPORARY) {
1789                 struct inet6_ifaddr *ifpub;
1790                 spin_lock_bh(&ifp->lock);
1791                 ifpub = ifp->ifpub;
1792                 if (ifpub) {
1793                         in6_ifa_hold(ifpub);
1794                         spin_unlock_bh(&ifp->lock);
1795                         ipv6_create_tempaddr(ifpub, ifp);
1796                         in6_ifa_put(ifpub);
1797                 } else {
1798                         spin_unlock_bh(&ifp->lock);
1799                 }
1800                 ipv6_del_addr(ifp);
1801         } else {
1802                 ipv6_del_addr(ifp);
1803         }
1804 }
1805
1806 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1807 {
1808         int err = -ENOENT;
1809
1810         spin_lock_bh(&ifp->lock);
1811         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1812                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1813                 err = 0;
1814         }
1815         spin_unlock_bh(&ifp->lock);
1816
1817         return err;
1818 }
1819
1820 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1821 {
1822         struct in6_addr addr;
1823         struct inet6_dev *idev = ifp->idev;
1824         struct net *net = dev_net(ifp->idev->dev);
1825
1826         if (addrconf_dad_end(ifp)) {
1827                 in6_ifa_put(ifp);
1828                 return;
1829         }
1830
1831         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1832                              ifp->idev->dev->name, &ifp->addr);
1833
1834         spin_lock_bh(&ifp->lock);
1835
1836         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1837                 int scope = ifp->scope;
1838                 u32 flags = ifp->flags;
1839                 struct in6_addr new_addr;
1840                 struct inet6_ifaddr *ifp2;
1841                 u32 valid_lft, preferred_lft;
1842                 int pfxlen = ifp->prefix_len;
1843                 int retries = ifp->stable_privacy_retry + 1;
1844
1845                 if (retries > net->ipv6.sysctl.idgen_retries) {
1846                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1847                                              ifp->idev->dev->name);
1848                         goto errdad;
1849                 }
1850
1851                 new_addr = ifp->addr;
1852                 if (ipv6_generate_stable_address(&new_addr, retries,
1853                                                  idev))
1854                         goto errdad;
1855
1856                 valid_lft = ifp->valid_lft;
1857                 preferred_lft = ifp->prefered_lft;
1858
1859                 spin_unlock_bh(&ifp->lock);
1860
1861                 if (idev->cnf.max_addresses &&
1862                     ipv6_count_addresses(idev) >=
1863                     idev->cnf.max_addresses)
1864                         goto lock_errdad;
1865
1866                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1867                                      ifp->idev->dev->name);
1868
1869                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1870                                      scope, flags, valid_lft,
1871                                      preferred_lft);
1872                 if (IS_ERR(ifp2))
1873                         goto lock_errdad;
1874
1875                 spin_lock_bh(&ifp2->lock);
1876                 ifp2->stable_privacy_retry = retries;
1877                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1878                 spin_unlock_bh(&ifp2->lock);
1879
1880                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1881                 in6_ifa_put(ifp2);
1882 lock_errdad:
1883                 spin_lock_bh(&ifp->lock);
1884         } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1885                 addr.s6_addr32[0] = htonl(0xfe800000);
1886                 addr.s6_addr32[1] = 0;
1887
1888                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1889                     ipv6_addr_equal(&ifp->addr, &addr)) {
1890                         /* DAD failed for link-local based on MAC address */
1891                         idev->cnf.disable_ipv6 = 1;
1892
1893                         pr_info("%s: IPv6 being disabled!\n",
1894                                 ifp->idev->dev->name);
1895                 }
1896         }
1897
1898 errdad:
1899         /* transition from _POSTDAD to _ERRDAD */
1900         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1901         spin_unlock_bh(&ifp->lock);
1902
1903         addrconf_mod_dad_work(ifp, 0);
1904 }
1905
1906 /* Join to solicited addr multicast group.
1907  * caller must hold RTNL */
1908 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1909 {
1910         struct in6_addr maddr;
1911
1912         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1913                 return;
1914
1915         addrconf_addr_solict_mult(addr, &maddr);
1916         ipv6_dev_mc_inc(dev, &maddr);
1917 }
1918
1919 /* caller must hold RTNL */
1920 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1921 {
1922         struct in6_addr maddr;
1923
1924         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1925                 return;
1926
1927         addrconf_addr_solict_mult(addr, &maddr);
1928         __ipv6_dev_mc_dec(idev, &maddr);
1929 }
1930
1931 /* caller must hold RTNL */
1932 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1933 {
1934         struct in6_addr addr;
1935
1936         if (ifp->prefix_len >= 127) /* RFC 6164 */
1937                 return;
1938         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1939         if (ipv6_addr_any(&addr))
1940                 return;
1941         __ipv6_dev_ac_inc(ifp->idev, &addr);
1942 }
1943
1944 /* caller must hold RTNL */
1945 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1946 {
1947         struct in6_addr addr;
1948
1949         if (ifp->prefix_len >= 127) /* RFC 6164 */
1950                 return;
1951         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1952         if (ipv6_addr_any(&addr))
1953                 return;
1954         __ipv6_dev_ac_dec(ifp->idev, &addr);
1955 }
1956
1957 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1958 {
1959         if (dev->addr_len != EUI64_ADDR_LEN)
1960                 return -1;
1961         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
1962         eui[0] ^= 2;
1963         return 0;
1964 }
1965
1966 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1967 {
1968         union fwnet_hwaddr *ha;
1969
1970         if (dev->addr_len != FWNET_ALEN)
1971                 return -1;
1972
1973         ha = (union fwnet_hwaddr *)dev->dev_addr;
1974
1975         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1976         eui[0] ^= 2;
1977         return 0;
1978 }
1979
1980 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1981 {
1982         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1983         if (dev->addr_len != ARCNET_ALEN)
1984                 return -1;
1985         memset(eui, 0, 7);
1986         eui[7] = *(u8 *)dev->dev_addr;
1987         return 0;
1988 }
1989
1990 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1991 {
1992         if (dev->addr_len != INFINIBAND_ALEN)
1993                 return -1;
1994         memcpy(eui, dev->dev_addr + 12, 8);
1995         eui[0] |= 2;
1996         return 0;
1997 }
1998
1999 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2000 {
2001         if (addr == 0)
2002                 return -1;
2003         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2004                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2005                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2006                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2007                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2008                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2009         eui[1] = 0;
2010         eui[2] = 0x5E;
2011         eui[3] = 0xFE;
2012         memcpy(eui + 4, &addr, 4);
2013         return 0;
2014 }
2015
2016 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2017 {
2018         if (dev->priv_flags & IFF_ISATAP)
2019                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2020         return -1;
2021 }
2022
2023 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2024 {
2025         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2026 }
2027
2028 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2029 {
2030         memcpy(eui, dev->perm_addr, 3);
2031         memcpy(eui + 5, dev->perm_addr + 3, 3);
2032         eui[3] = 0xFF;
2033         eui[4] = 0xFE;
2034         eui[0] ^= 2;
2035         return 0;
2036 }
2037
2038 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2039 {
2040         switch (dev->type) {
2041         case ARPHRD_ETHER:
2042         case ARPHRD_FDDI:
2043                 return addrconf_ifid_eui48(eui, dev);
2044         case ARPHRD_ARCNET:
2045                 return addrconf_ifid_arcnet(eui, dev);
2046         case ARPHRD_INFINIBAND:
2047                 return addrconf_ifid_infiniband(eui, dev);
2048         case ARPHRD_SIT:
2049                 return addrconf_ifid_sit(eui, dev);
2050         case ARPHRD_IPGRE:
2051                 return addrconf_ifid_gre(eui, dev);
2052         case ARPHRD_6LOWPAN:
2053                 return addrconf_ifid_eui64(eui, dev);
2054         case ARPHRD_IEEE1394:
2055                 return addrconf_ifid_ieee1394(eui, dev);
2056         case ARPHRD_TUNNEL6:
2057                 return addrconf_ifid_ip6tnl(eui, dev);
2058         }
2059         return -1;
2060 }
2061
2062 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2063 {
2064         int err = -1;
2065         struct inet6_ifaddr *ifp;
2066
2067         read_lock_bh(&idev->lock);
2068         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2069                 if (ifp->scope > IFA_LINK)
2070                         break;
2071                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2072                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2073                         err = 0;
2074                         break;
2075                 }
2076         }
2077         read_unlock_bh(&idev->lock);
2078         return err;
2079 }
2080
2081 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2082 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2083 {
2084 regen:
2085         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2086         idev->rndid[0] &= ~0x02;
2087
2088         /*
2089          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2090          * check if generated address is not inappropriate
2091          *
2092          *  - Reserved subnet anycast (RFC 2526)
2093          *      11111101 11....11 1xxxxxxx
2094          *  - ISATAP (RFC4214) 6.1
2095          *      00-00-5E-FE-xx-xx-xx-xx
2096          *  - value 0
2097          *  - XXX: already assigned to an address on the device
2098          */
2099         if (idev->rndid[0] == 0xfd &&
2100             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2101             (idev->rndid[7]&0x80))
2102                 goto regen;
2103         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2104                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2105                         goto regen;
2106                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2107                         goto regen;
2108         }
2109 }
2110
2111 static void ipv6_regen_rndid(unsigned long data)
2112 {
2113         struct inet6_dev *idev = (struct inet6_dev *) data;
2114         unsigned long expires;
2115
2116         rcu_read_lock_bh();
2117         write_lock_bh(&idev->lock);
2118
2119         if (idev->dead)
2120                 goto out;
2121
2122         __ipv6_regen_rndid(idev);
2123
2124         expires = jiffies +
2125                 idev->cnf.temp_prefered_lft * HZ -
2126                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2127                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2128                 idev->cnf.max_desync_factor * HZ;
2129         if (time_before(expires, jiffies)) {
2130                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2131                         __func__, idev->dev->name);
2132                 goto out;
2133         }
2134
2135         if (!mod_timer(&idev->regen_timer, expires))
2136                 in6_dev_hold(idev);
2137
2138 out:
2139         write_unlock_bh(&idev->lock);
2140         rcu_read_unlock_bh();
2141         in6_dev_put(idev);
2142 }
2143
2144 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2145 {
2146         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2147                 __ipv6_regen_rndid(idev);
2148 }
2149
2150 /*
2151  *      Add prefix route.
2152  */
2153
2154 static void
2155 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2156                       unsigned long expires, u32 flags)
2157 {
2158         struct fib6_config cfg = {
2159                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2160                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2161                 .fc_ifindex = dev->ifindex,
2162                 .fc_expires = expires,
2163                 .fc_dst_len = plen,
2164                 .fc_flags = RTF_UP | flags,
2165                 .fc_nlinfo.nl_net = dev_net(dev),
2166                 .fc_protocol = RTPROT_KERNEL,
2167         };
2168
2169         cfg.fc_dst = *pfx;
2170
2171         /* Prevent useless cloning on PtP SIT.
2172            This thing is done here expecting that the whole
2173            class of non-broadcast devices need not cloning.
2174          */
2175 #if IS_ENABLED(CONFIG_IPV6_SIT)
2176         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2177                 cfg.fc_flags |= RTF_NONEXTHOP;
2178 #endif
2179
2180         ip6_route_add(&cfg);
2181 }
2182
2183
2184 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2185                                                   int plen,
2186                                                   const struct net_device *dev,
2187                                                   u32 flags, u32 noflags)
2188 {
2189         struct fib6_node *fn;
2190         struct rt6_info *rt = NULL;
2191         struct fib6_table *table;
2192         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2193
2194         table = fib6_get_table(dev_net(dev), tb_id);
2195         if (!table)
2196                 return NULL;
2197
2198         read_lock_bh(&table->tb6_lock);
2199         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2200         if (!fn)
2201                 goto out;
2202
2203         noflags |= RTF_CACHE;
2204         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2205                 if (rt->dst.dev->ifindex != dev->ifindex)
2206                         continue;
2207                 if ((rt->rt6i_flags & flags) != flags)
2208                         continue;
2209                 if ((rt->rt6i_flags & noflags) != 0)
2210                         continue;
2211                 dst_hold(&rt->dst);
2212                 break;
2213         }
2214 out:
2215         read_unlock_bh(&table->tb6_lock);
2216         return rt;
2217 }
2218
2219
2220 /* Create "default" multicast route to the interface */
2221
2222 static void addrconf_add_mroute(struct net_device *dev)
2223 {
2224         struct fib6_config cfg = {
2225                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2226                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2227                 .fc_ifindex = dev->ifindex,
2228                 .fc_dst_len = 8,
2229                 .fc_flags = RTF_UP,
2230                 .fc_nlinfo.nl_net = dev_net(dev),
2231         };
2232
2233         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2234
2235         ip6_route_add(&cfg);
2236 }
2237
2238 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2239 {
2240         struct inet6_dev *idev;
2241
2242         ASSERT_RTNL();
2243
2244         idev = ipv6_find_idev(dev);
2245         if (!idev)
2246                 return ERR_PTR(-ENOBUFS);
2247
2248         if (idev->cnf.disable_ipv6)
2249                 return ERR_PTR(-EACCES);
2250
2251         /* Add default multicast route */
2252         if (!(dev->flags & IFF_LOOPBACK))
2253                 addrconf_add_mroute(dev);
2254
2255         return idev;
2256 }
2257
2258 static void manage_tempaddrs(struct inet6_dev *idev,
2259                              struct inet6_ifaddr *ifp,
2260                              __u32 valid_lft, __u32 prefered_lft,
2261                              bool create, unsigned long now)
2262 {
2263         u32 flags;
2264         struct inet6_ifaddr *ift;
2265
2266         read_lock_bh(&idev->lock);
2267         /* update all temporary addresses in the list */
2268         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2269                 int age, max_valid, max_prefered;
2270
2271                 if (ifp != ift->ifpub)
2272                         continue;
2273
2274                 /* RFC 4941 section 3.3:
2275                  * If a received option will extend the lifetime of a public
2276                  * address, the lifetimes of temporary addresses should
2277                  * be extended, subject to the overall constraint that no
2278                  * temporary addresses should ever remain "valid" or "preferred"
2279                  * for a time longer than (TEMP_VALID_LIFETIME) or
2280                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2281                  */
2282                 age = (now - ift->cstamp) / HZ;
2283                 max_valid = idev->cnf.temp_valid_lft - age;
2284                 if (max_valid < 0)
2285                         max_valid = 0;
2286
2287                 max_prefered = idev->cnf.temp_prefered_lft -
2288                                idev->cnf.max_desync_factor - age;
2289                 if (max_prefered < 0)
2290                         max_prefered = 0;
2291
2292                 if (valid_lft > max_valid)
2293                         valid_lft = max_valid;
2294
2295                 if (prefered_lft > max_prefered)
2296                         prefered_lft = max_prefered;
2297
2298                 spin_lock(&ift->lock);
2299                 flags = ift->flags;
2300                 ift->valid_lft = valid_lft;
2301                 ift->prefered_lft = prefered_lft;
2302                 ift->tstamp = now;
2303                 if (prefered_lft > 0)
2304                         ift->flags &= ~IFA_F_DEPRECATED;
2305
2306                 spin_unlock(&ift->lock);
2307                 if (!(flags&IFA_F_TENTATIVE))
2308                         ipv6_ifa_notify(0, ift);
2309         }
2310
2311         if ((create || list_empty(&idev->tempaddr_list)) &&
2312             idev->cnf.use_tempaddr > 0) {
2313                 /* When a new public address is created as described
2314                  * in [ADDRCONF], also create a new temporary address.
2315                  * Also create a temporary address if it's enabled but
2316                  * no temporary address currently exists.
2317                  */
2318                 read_unlock_bh(&idev->lock);
2319                 ipv6_create_tempaddr(ifp, NULL);
2320         } else {
2321                 read_unlock_bh(&idev->lock);
2322         }
2323 }
2324
2325 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2326 {
2327         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2328                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2329 }
2330
2331 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2332 {
2333         struct prefix_info *pinfo;
2334         __u32 valid_lft;
2335         __u32 prefered_lft;
2336         int addr_type;
2337         u32 addr_flags = 0;
2338         struct inet6_dev *in6_dev;
2339         struct net *net = dev_net(dev);
2340
2341         pinfo = (struct prefix_info *) opt;
2342
2343         if (len < sizeof(struct prefix_info)) {
2344                 ADBG("addrconf: prefix option too short\n");
2345                 return;
2346         }
2347
2348         /*
2349          *      Validation checks ([ADDRCONF], page 19)
2350          */
2351
2352         addr_type = ipv6_addr_type(&pinfo->prefix);
2353
2354         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2355                 return;
2356
2357         valid_lft = ntohl(pinfo->valid);
2358         prefered_lft = ntohl(pinfo->prefered);
2359
2360         if (prefered_lft > valid_lft) {
2361                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2362                 return;
2363         }
2364
2365         in6_dev = in6_dev_get(dev);
2366
2367         if (!in6_dev) {
2368                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2369                                     dev->name);
2370                 return;
2371         }
2372
2373         /*
2374          *      Two things going on here:
2375          *      1) Add routes for on-link prefixes
2376          *      2) Configure prefixes with the auto flag set
2377          */
2378
2379         if (pinfo->onlink) {
2380                 struct rt6_info *rt;
2381                 unsigned long rt_expires;
2382
2383                 /* Avoid arithmetic overflow. Really, we could
2384                  * save rt_expires in seconds, likely valid_lft,
2385                  * but it would require division in fib gc, that it
2386                  * not good.
2387                  */
2388                 if (HZ > USER_HZ)
2389                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2390                 else
2391                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2392
2393                 if (addrconf_finite_timeout(rt_expires))
2394                         rt_expires *= HZ;
2395
2396                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2397                                                pinfo->prefix_len,
2398                                                dev,
2399                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2400                                                RTF_GATEWAY | RTF_DEFAULT);
2401
2402                 if (rt) {
2403                         /* Autoconf prefix route */
2404                         if (valid_lft == 0) {
2405                                 ip6_del_rt(rt);
2406                                 rt = NULL;
2407                         } else if (addrconf_finite_timeout(rt_expires)) {
2408                                 /* not infinity */
2409                                 rt6_set_expires(rt, jiffies + rt_expires);
2410                         } else {
2411                                 rt6_clean_expires(rt);
2412                         }
2413                 } else if (valid_lft) {
2414                         clock_t expires = 0;
2415                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2416                         if (addrconf_finite_timeout(rt_expires)) {
2417                                 /* not infinity */
2418                                 flags |= RTF_EXPIRES;
2419                                 expires = jiffies_to_clock_t(rt_expires);
2420                         }
2421                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2422                                               dev, expires, flags);
2423                 }
2424                 ip6_rt_put(rt);
2425         }
2426
2427         /* Try to figure out our local address for this prefix */
2428
2429         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2430                 struct inet6_ifaddr *ifp;
2431                 struct in6_addr addr;
2432                 int create = 0, update_lft = 0;
2433                 bool tokenized = false;
2434
2435                 if (pinfo->prefix_len == 64) {
2436                         memcpy(&addr, &pinfo->prefix, 8);
2437
2438                         if (!ipv6_addr_any(&in6_dev->token)) {
2439                                 read_lock_bh(&in6_dev->lock);
2440                                 memcpy(addr.s6_addr + 8,
2441                                        in6_dev->token.s6_addr + 8, 8);
2442                                 read_unlock_bh(&in6_dev->lock);
2443                                 tokenized = true;
2444                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2445                                    !ipv6_generate_stable_address(&addr, 0,
2446                                                                  in6_dev)) {
2447                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2448                                 goto ok;
2449                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2450                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2451                                 in6_dev_put(in6_dev);
2452                                 return;
2453                         }
2454                         goto ok;
2455                 }
2456                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2457                                     pinfo->prefix_len);
2458                 in6_dev_put(in6_dev);
2459                 return;
2460
2461 ok:
2462
2463                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2464
2465                 if (!ifp && valid_lft) {
2466                         int max_addresses = in6_dev->cnf.max_addresses;
2467
2468 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2469                         if (in6_dev->cnf.optimistic_dad &&
2470                             !net->ipv6.devconf_all->forwarding && sllao)
2471                                 addr_flags |= IFA_F_OPTIMISTIC;
2472 #endif
2473
2474                         /* Do not allow to create too much of autoconfigured
2475                          * addresses; this would be too easy way to crash kernel.
2476                          */
2477                         if (!max_addresses ||
2478                             ipv6_count_addresses(in6_dev) < max_addresses)
2479                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2480                                                     pinfo->prefix_len,
2481                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2482                                                     addr_flags, valid_lft,
2483                                                     prefered_lft);
2484
2485                         if (IS_ERR_OR_NULL(ifp)) {
2486                                 in6_dev_put(in6_dev);
2487                                 return;
2488                         }
2489
2490                         update_lft = 0;
2491                         create = 1;
2492                         spin_lock_bh(&ifp->lock);
2493                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2494                         ifp->cstamp = jiffies;
2495                         ifp->tokenized = tokenized;
2496                         spin_unlock_bh(&ifp->lock);
2497                         addrconf_dad_start(ifp);
2498                 }
2499
2500                 if (ifp) {
2501                         u32 flags;
2502                         unsigned long now;
2503                         u32 stored_lft;
2504
2505                         /* update lifetime (RFC2462 5.5.3 e) */
2506                         spin_lock_bh(&ifp->lock);
2507                         now = jiffies;
2508                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2509                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2510                         else
2511                                 stored_lft = 0;
2512                         if (!update_lft && !create && stored_lft) {
2513                                 const u32 minimum_lft = min_t(u32,
2514                                         stored_lft, MIN_VALID_LIFETIME);
2515                                 valid_lft = max(valid_lft, minimum_lft);
2516
2517                                 /* RFC4862 Section 5.5.3e:
2518                                  * "Note that the preferred lifetime of the
2519                                  *  corresponding address is always reset to
2520                                  *  the Preferred Lifetime in the received
2521                                  *  Prefix Information option, regardless of
2522                                  *  whether the valid lifetime is also reset or
2523                                  *  ignored."
2524                                  *
2525                                  * So we should always update prefered_lft here.
2526                                  */
2527                                 update_lft = 1;
2528                         }
2529
2530                         if (update_lft) {
2531                                 ifp->valid_lft = valid_lft;
2532                                 ifp->prefered_lft = prefered_lft;
2533                                 ifp->tstamp = now;
2534                                 flags = ifp->flags;
2535                                 ifp->flags &= ~IFA_F_DEPRECATED;
2536                                 spin_unlock_bh(&ifp->lock);
2537
2538                                 if (!(flags&IFA_F_TENTATIVE))
2539                                         ipv6_ifa_notify(0, ifp);
2540                         } else
2541                                 spin_unlock_bh(&ifp->lock);
2542
2543                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2544                                          create, now);
2545
2546                         in6_ifa_put(ifp);
2547                         addrconf_verify();
2548                 }
2549         }
2550         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2551         in6_dev_put(in6_dev);
2552 }
2553
2554 /*
2555  *      Set destination address.
2556  *      Special case for SIT interfaces where we create a new "virtual"
2557  *      device.
2558  */
2559 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2560 {
2561         struct in6_ifreq ireq;
2562         struct net_device *dev;
2563         int err = -EINVAL;
2564
2565         rtnl_lock();
2566
2567         err = -EFAULT;
2568         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2569                 goto err_exit;
2570
2571         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2572
2573         err = -ENODEV;
2574         if (!dev)
2575                 goto err_exit;
2576
2577 #if IS_ENABLED(CONFIG_IPV6_SIT)
2578         if (dev->type == ARPHRD_SIT) {
2579                 const struct net_device_ops *ops = dev->netdev_ops;
2580                 struct ifreq ifr;
2581                 struct ip_tunnel_parm p;
2582
2583                 err = -EADDRNOTAVAIL;
2584                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2585                         goto err_exit;
2586
2587                 memset(&p, 0, sizeof(p));
2588                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2589                 p.iph.saddr = 0;
2590                 p.iph.version = 4;
2591                 p.iph.ihl = 5;
2592                 p.iph.protocol = IPPROTO_IPV6;
2593                 p.iph.ttl = 64;
2594                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2595
2596                 if (ops->ndo_do_ioctl) {
2597                         mm_segment_t oldfs = get_fs();
2598
2599                         set_fs(KERNEL_DS);
2600                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2601                         set_fs(oldfs);
2602                 } else
2603                         err = -EOPNOTSUPP;
2604
2605                 if (err == 0) {
2606                         err = -ENOBUFS;
2607                         dev = __dev_get_by_name(net, p.name);
2608                         if (!dev)
2609                                 goto err_exit;
2610                         err = dev_open(dev);
2611                 }
2612         }
2613 #endif
2614
2615 err_exit:
2616         rtnl_unlock();
2617         return err;
2618 }
2619
2620 static int ipv6_mc_config(struct sock *sk, bool join,
2621                           const struct in6_addr *addr, int ifindex)
2622 {
2623         int ret;
2624
2625         ASSERT_RTNL();
2626
2627         lock_sock(sk);
2628         if (join)
2629                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2630         else
2631                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2632         release_sock(sk);
2633
2634         return ret;
2635 }
2636
2637 /*
2638  *      Manual configuration of address on an interface
2639  */
2640 static int inet6_addr_add(struct net *net, int ifindex,
2641                           const struct in6_addr *pfx,
2642                           const struct in6_addr *peer_pfx,
2643                           unsigned int plen, __u32 ifa_flags,
2644                           __u32 prefered_lft, __u32 valid_lft)
2645 {
2646         struct inet6_ifaddr *ifp;
2647         struct inet6_dev *idev;
2648         struct net_device *dev;
2649         unsigned long timeout;
2650         clock_t expires;
2651         int scope;
2652         u32 flags;
2653
2654         ASSERT_RTNL();
2655
2656         if (plen > 128)
2657                 return -EINVAL;
2658
2659         /* check the lifetime */
2660         if (!valid_lft || prefered_lft > valid_lft)
2661                 return -EINVAL;
2662
2663         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2664                 return -EINVAL;
2665
2666         dev = __dev_get_by_index(net, ifindex);
2667         if (!dev)
2668                 return -ENODEV;
2669
2670         idev = addrconf_add_dev(dev);
2671         if (IS_ERR(idev))
2672                 return PTR_ERR(idev);
2673
2674         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2675                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2676                                          true, pfx, ifindex);
2677
2678                 if (ret < 0)
2679                         return ret;
2680         }
2681
2682         scope = ipv6_addr_scope(pfx);
2683
2684         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2685         if (addrconf_finite_timeout(timeout)) {
2686                 expires = jiffies_to_clock_t(timeout * HZ);
2687                 valid_lft = timeout;
2688                 flags = RTF_EXPIRES;
2689         } else {
2690                 expires = 0;
2691                 flags = 0;
2692                 ifa_flags |= IFA_F_PERMANENT;
2693         }
2694
2695         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2696         if (addrconf_finite_timeout(timeout)) {
2697                 if (timeout == 0)
2698                         ifa_flags |= IFA_F_DEPRECATED;
2699                 prefered_lft = timeout;
2700         }
2701
2702         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2703                             valid_lft, prefered_lft);
2704
2705         if (!IS_ERR(ifp)) {
2706                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2707                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2708                                               expires, flags);
2709                 }
2710
2711                 /*
2712                  * Note that section 3.1 of RFC 4429 indicates
2713                  * that the Optimistic flag should not be set for
2714                  * manually configured addresses
2715                  */
2716                 addrconf_dad_start(ifp);
2717                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2718                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2719                                          true, jiffies);
2720                 in6_ifa_put(ifp);
2721                 addrconf_verify_rtnl();
2722                 return 0;
2723         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2724                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2725                                false, pfx, ifindex);
2726         }
2727
2728         return PTR_ERR(ifp);
2729 }
2730
2731 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2732                           const struct in6_addr *pfx, unsigned int plen)
2733 {
2734         struct inet6_ifaddr *ifp;
2735         struct inet6_dev *idev;
2736         struct net_device *dev;
2737
2738         if (plen > 128)
2739                 return -EINVAL;
2740
2741         dev = __dev_get_by_index(net, ifindex);
2742         if (!dev)
2743                 return -ENODEV;
2744
2745         idev = __in6_dev_get(dev);
2746         if (!idev)
2747                 return -ENXIO;
2748
2749         read_lock_bh(&idev->lock);
2750         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2751                 if (ifp->prefix_len == plen &&
2752                     ipv6_addr_equal(pfx, &ifp->addr)) {
2753                         in6_ifa_hold(ifp);
2754                         read_unlock_bh(&idev->lock);
2755
2756                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2757                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2758                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2759                                                  jiffies);
2760                         ipv6_del_addr(ifp);
2761                         addrconf_verify_rtnl();
2762                         if (ipv6_addr_is_multicast(pfx)) {
2763                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2764                                                false, pfx, dev->ifindex);
2765                         }
2766                         return 0;
2767                 }
2768         }
2769         read_unlock_bh(&idev->lock);
2770         return -EADDRNOTAVAIL;
2771 }
2772
2773
2774 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2775 {
2776         struct in6_ifreq ireq;
2777         int err;
2778
2779         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2780                 return -EPERM;
2781
2782         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2783                 return -EFAULT;
2784
2785         rtnl_lock();
2786         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2787                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2788                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2789         rtnl_unlock();
2790         return err;
2791 }
2792
2793 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2794 {
2795         struct in6_ifreq ireq;
2796         int err;
2797
2798         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2799                 return -EPERM;
2800
2801         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2802                 return -EFAULT;
2803
2804         rtnl_lock();
2805         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2806                              ireq.ifr6_prefixlen);
2807         rtnl_unlock();
2808         return err;
2809 }
2810
2811 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2812                      int plen, int scope)
2813 {
2814         struct inet6_ifaddr *ifp;
2815
2816         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2817                             scope, IFA_F_PERMANENT,
2818                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2819         if (!IS_ERR(ifp)) {
2820                 spin_lock_bh(&ifp->lock);
2821                 ifp->flags &= ~IFA_F_TENTATIVE;
2822                 spin_unlock_bh(&ifp->lock);
2823                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2824                 in6_ifa_put(ifp);
2825         }
2826 }
2827
2828 #if IS_ENABLED(CONFIG_IPV6_SIT)
2829 static void sit_add_v4_addrs(struct inet6_dev *idev)
2830 {
2831         struct in6_addr addr;
2832         struct net_device *dev;
2833         struct net *net = dev_net(idev->dev);
2834         int scope, plen;
2835         u32 pflags = 0;
2836
2837         ASSERT_RTNL();
2838
2839         memset(&addr, 0, sizeof(struct in6_addr));
2840         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2841
2842         if (idev->dev->flags&IFF_POINTOPOINT) {
2843                 addr.s6_addr32[0] = htonl(0xfe800000);
2844                 scope = IFA_LINK;
2845                 plen = 64;
2846         } else {
2847                 scope = IPV6_ADDR_COMPATv4;
2848                 plen = 96;
2849                 pflags |= RTF_NONEXTHOP;
2850         }
2851
2852         if (addr.s6_addr32[3]) {
2853                 add_addr(idev, &addr, plen, scope);
2854                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2855                 return;
2856         }
2857
2858         for_each_netdev(net, dev) {
2859                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2860                 if (in_dev && (dev->flags & IFF_UP)) {
2861                         struct in_ifaddr *ifa;
2862
2863                         int flag = scope;
2864
2865                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2866
2867                                 addr.s6_addr32[3] = ifa->ifa_local;
2868
2869                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2870                                         continue;
2871                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2872                                         if (idev->dev->flags&IFF_POINTOPOINT)
2873                                                 continue;
2874                                         flag |= IFA_HOST;
2875                                 }
2876
2877                                 add_addr(idev, &addr, plen, flag);
2878                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2879                                                       pflags);
2880                         }
2881                 }
2882         }
2883 }
2884 #endif
2885
2886 static void init_loopback(struct net_device *dev)
2887 {
2888         struct inet6_dev  *idev;
2889         struct net_device *sp_dev;
2890         struct inet6_ifaddr *sp_ifa;
2891         struct rt6_info *sp_rt;
2892
2893         /* ::1 */
2894
2895         ASSERT_RTNL();
2896
2897         idev = ipv6_find_idev(dev);
2898         if (!idev) {
2899                 pr_debug("%s: add_dev failed\n", __func__);
2900                 return;
2901         }
2902
2903         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2904
2905         /* Add routes to other interface's IPv6 addresses */
2906         for_each_netdev(dev_net(dev), sp_dev) {
2907                 if (!strcmp(sp_dev->name, dev->name))
2908                         continue;
2909
2910                 idev = __in6_dev_get(sp_dev);
2911                 if (!idev)
2912                         continue;
2913
2914                 read_lock_bh(&idev->lock);
2915                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2916
2917                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2918                                 continue;
2919
2920                         if (sp_ifa->rt) {
2921                                 /* This dst has been added to garbage list when
2922                                  * lo device down, release this obsolete dst and
2923                                  * reallocate a new router for ifa.
2924                                  */
2925                                 if (sp_ifa->rt->dst.obsolete > 0) {
2926                                         ip6_rt_put(sp_ifa->rt);
2927                                         sp_ifa->rt = NULL;
2928                                 } else {
2929                                         continue;
2930                                 }
2931                         }
2932
2933                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2934
2935                         /* Failure cases are ignored */
2936                         if (!IS_ERR(sp_rt)) {
2937                                 sp_ifa->rt = sp_rt;
2938                                 ip6_ins_rt(sp_rt);
2939                         }
2940                 }
2941                 read_unlock_bh(&idev->lock);
2942         }
2943 }
2944
2945 static void addrconf_add_linklocal(struct inet6_dev *idev,
2946                                    const struct in6_addr *addr, u32 flags)
2947 {
2948         struct inet6_ifaddr *ifp;
2949         u32 addr_flags = flags | IFA_F_PERMANENT;
2950
2951 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2952         if (idev->cnf.optimistic_dad &&
2953             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2954                 addr_flags |= IFA_F_OPTIMISTIC;
2955 #endif
2956
2957         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2958                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2959         if (!IS_ERR(ifp)) {
2960                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2961                 addrconf_dad_start(ifp);
2962                 in6_ifa_put(ifp);
2963         }
2964 }
2965
2966 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2967 {
2968         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2969                 return true;
2970
2971         if (address.s6_addr32[2] == htonl(0x02005eff) &&
2972             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2973                 return true;
2974
2975         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2976             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2977                 return true;
2978
2979         return false;
2980 }
2981
2982 static int ipv6_generate_stable_address(struct in6_addr *address,
2983                                         u8 dad_count,
2984                                         const struct inet6_dev *idev)
2985 {
2986         static DEFINE_SPINLOCK(lock);
2987         static __u32 digest[SHA_DIGEST_WORDS];
2988         static __u32 workspace[SHA_WORKSPACE_WORDS];
2989
2990         static union {
2991                 char __data[SHA_MESSAGE_BYTES];
2992                 struct {
2993                         struct in6_addr secret;
2994                         __be32 prefix[2];
2995                         unsigned char hwaddr[MAX_ADDR_LEN];
2996                         u8 dad_count;
2997                 } __packed;
2998         } data;
2999
3000         struct in6_addr secret;
3001         struct in6_addr temp;
3002         struct net *net = dev_net(idev->dev);
3003
3004         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3005
3006         if (idev->cnf.stable_secret.initialized)
3007                 secret = idev->cnf.stable_secret.secret;
3008         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3009                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3010         else
3011                 return -1;
3012
3013 retry:
3014         spin_lock_bh(&lock);
3015
3016         sha_init(digest);
3017         memset(&data, 0, sizeof(data));
3018         memset(workspace, 0, sizeof(workspace));
3019         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3020         data.prefix[0] = address->s6_addr32[0];
3021         data.prefix[1] = address->s6_addr32[1];
3022         data.secret = secret;
3023         data.dad_count = dad_count;
3024
3025         sha_transform(digest, data.__data, workspace);
3026
3027         temp = *address;
3028         temp.s6_addr32[2] = (__force __be32)digest[0];
3029         temp.s6_addr32[3] = (__force __be32)digest[1];
3030
3031         spin_unlock_bh(&lock);
3032
3033         if (ipv6_reserved_interfaceid(temp)) {
3034                 dad_count++;
3035                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3036                         return -1;
3037                 goto retry;
3038         }
3039
3040         *address = temp;
3041         return 0;
3042 }
3043
3044 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3045 {
3046         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3047
3048         if (s->initialized)
3049                 return;
3050         s = &idev->cnf.stable_secret;
3051         get_random_bytes(&s->secret, sizeof(s->secret));
3052         s->initialized = true;
3053 }
3054
3055 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3056 {
3057         struct in6_addr addr;
3058
3059         /* no link local addresses on L3 master devices */
3060         if (netif_is_l3_master(idev->dev))
3061                 return;
3062
3063         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3064
3065         switch (idev->addr_gen_mode) {
3066         case IN6_ADDR_GEN_MODE_RANDOM:
3067                 ipv6_gen_mode_random_init(idev);
3068                 /* fallthrough */
3069         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3070                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3071                         addrconf_add_linklocal(idev, &addr,
3072                                                IFA_F_STABLE_PRIVACY);
3073                 else if (prefix_route)
3074                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3075                 break;
3076         case IN6_ADDR_GEN_MODE_EUI64:
3077                 /* addrconf_add_linklocal also adds a prefix_route and we
3078                  * only need to care about prefix routes if ipv6_generate_eui64
3079                  * couldn't generate one.
3080                  */
3081                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3082                         addrconf_add_linklocal(idev, &addr, 0);
3083                 else if (prefix_route)
3084                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3085                 break;
3086         case IN6_ADDR_GEN_MODE_NONE:
3087         default:
3088                 /* will not add any link local address */
3089                 break;
3090         }
3091 }
3092
3093 static void addrconf_dev_config(struct net_device *dev)
3094 {
3095         struct inet6_dev *idev;
3096
3097         ASSERT_RTNL();
3098
3099         if ((dev->type != ARPHRD_ETHER) &&
3100             (dev->type != ARPHRD_FDDI) &&
3101             (dev->type != ARPHRD_ARCNET) &&
3102             (dev->type != ARPHRD_INFINIBAND) &&
3103             (dev->type != ARPHRD_IEEE1394) &&
3104             (dev->type != ARPHRD_TUNNEL6) &&
3105             (dev->type != ARPHRD_6LOWPAN) &&
3106             (dev->type != ARPHRD_NONE)) {
3107                 /* Alas, we support only Ethernet autoconfiguration. */
3108                 return;
3109         }
3110
3111         idev = addrconf_add_dev(dev);
3112         if (IS_ERR(idev))
3113                 return;
3114
3115         /* this device type has no EUI support */
3116         if (dev->type == ARPHRD_NONE &&
3117             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3118                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3119
3120         addrconf_addr_gen(idev, false);
3121 }
3122
3123 #if IS_ENABLED(CONFIG_IPV6_SIT)
3124 static void addrconf_sit_config(struct net_device *dev)
3125 {
3126         struct inet6_dev *idev;
3127
3128         ASSERT_RTNL();
3129
3130         /*
3131          * Configure the tunnel with one of our IPv4
3132          * addresses... we should configure all of
3133          * our v4 addrs in the tunnel
3134          */
3135
3136         idev = ipv6_find_idev(dev);
3137         if (!idev) {
3138                 pr_debug("%s: add_dev failed\n", __func__);
3139                 return;
3140         }
3141
3142         if (dev->priv_flags & IFF_ISATAP) {
3143                 addrconf_addr_gen(idev, false);
3144                 return;
3145         }
3146
3147         sit_add_v4_addrs(idev);
3148
3149         if (dev->flags&IFF_POINTOPOINT)
3150                 addrconf_add_mroute(dev);
3151 }
3152 #endif
3153
3154 #if IS_ENABLED(CONFIG_NET_IPGRE)
3155 static void addrconf_gre_config(struct net_device *dev)
3156 {
3157         struct inet6_dev *idev;
3158
3159         ASSERT_RTNL();
3160
3161         idev = ipv6_find_idev(dev);
3162         if (!idev) {
3163                 pr_debug("%s: add_dev failed\n", __func__);
3164                 return;
3165         }
3166
3167         addrconf_addr_gen(idev, true);
3168         if (dev->flags & IFF_POINTOPOINT)
3169                 addrconf_add_mroute(dev);
3170 }
3171 #endif
3172
3173 static int fixup_permanent_addr(struct inet6_dev *idev,
3174                                 struct inet6_ifaddr *ifp)
3175 {
3176         if (!ifp->rt) {
3177                 struct rt6_info *rt;
3178
3179                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3180                 if (unlikely(IS_ERR(rt)))
3181                         return PTR_ERR(rt);
3182
3183                 ifp->rt = rt;
3184         }
3185
3186         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3187                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3188                                       idev->dev, 0, 0);
3189         }
3190
3191         addrconf_dad_start(ifp);
3192
3193         return 0;
3194 }
3195
3196 static void addrconf_permanent_addr(struct net_device *dev)
3197 {
3198         struct inet6_ifaddr *ifp, *tmp;
3199         struct inet6_dev *idev;
3200
3201         idev = __in6_dev_get(dev);
3202         if (!idev)
3203                 return;
3204
3205         write_lock_bh(&idev->lock);
3206
3207         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3208                 if ((ifp->flags & IFA_F_PERMANENT) &&
3209                     fixup_permanent_addr(idev, ifp) < 0) {
3210                         write_unlock_bh(&idev->lock);
3211                         ipv6_del_addr(ifp);
3212                         write_lock_bh(&idev->lock);
3213
3214                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3215                                              idev->dev->name, &ifp->addr);
3216                 }
3217         }
3218
3219         write_unlock_bh(&idev->lock);
3220 }
3221
3222 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3223                            void *ptr)
3224 {
3225         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3226         struct inet6_dev *idev = __in6_dev_get(dev);
3227         int run_pending = 0;
3228         int err;
3229
3230         switch (event) {
3231         case NETDEV_REGISTER:
3232                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3233                         idev = ipv6_add_dev(dev);
3234                         if (IS_ERR(idev))
3235                                 return notifier_from_errno(PTR_ERR(idev));
3236                 }
3237                 break;
3238
3239         case NETDEV_CHANGEMTU:
3240                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3241                 if (dev->mtu < IPV6_MIN_MTU) {
3242                         addrconf_ifdown(dev, 1);
3243                         break;
3244                 }
3245
3246                 if (idev) {
3247                         rt6_mtu_change(dev, dev->mtu);
3248                         idev->cnf.mtu6 = dev->mtu;
3249                         break;
3250                 }
3251
3252                 /* allocate new idev */
3253                 idev = ipv6_add_dev(dev);
3254                 if (IS_ERR(idev))
3255                         break;
3256
3257                 /* device is still not ready */
3258                 if (!(idev->if_flags & IF_READY))
3259                         break;
3260
3261                 run_pending = 1;
3262
3263                 /* fall through */
3264
3265         case NETDEV_UP:
3266         case NETDEV_CHANGE:
3267                 if (dev->flags & IFF_SLAVE)
3268                         break;
3269
3270                 if (idev && idev->cnf.disable_ipv6)
3271                         break;
3272
3273                 if (event == NETDEV_UP) {
3274                         if (!addrconf_qdisc_ok(dev)) {
3275                                 /* device is not ready yet. */
3276                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3277                                         dev->name);
3278                                 break;
3279                         }
3280
3281                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3282                                 idev = ipv6_add_dev(dev);
3283
3284                         if (!IS_ERR_OR_NULL(idev)) {
3285                                 idev->if_flags |= IF_READY;
3286                                 run_pending = 1;
3287                         }
3288                 } else if (event == NETDEV_CHANGE) {
3289                         if (!addrconf_qdisc_ok(dev)) {
3290                                 /* device is still not ready. */
3291                                 break;
3292                         }
3293
3294                         if (idev) {
3295                                 if (idev->if_flags & IF_READY)
3296                                         /* device is already configured. */
3297                                         break;
3298                                 idev->if_flags |= IF_READY;
3299                         }
3300
3301                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3302                                 dev->name);
3303
3304                         run_pending = 1;
3305                 }
3306
3307                 /* restore routes for permanent addresses */
3308                 addrconf_permanent_addr(dev);
3309
3310                 switch (dev->type) {
3311 #if IS_ENABLED(CONFIG_IPV6_SIT)
3312                 case ARPHRD_SIT:
3313                         addrconf_sit_config(dev);
3314                         break;
3315 #endif
3316 #if IS_ENABLED(CONFIG_NET_IPGRE)
3317                 case ARPHRD_IPGRE:
3318                         addrconf_gre_config(dev);
3319                         break;
3320 #endif
3321                 case ARPHRD_LOOPBACK:
3322                         init_loopback(dev);
3323                         break;
3324
3325                 default:
3326                         addrconf_dev_config(dev);
3327                         break;
3328                 }
3329
3330                 if (!IS_ERR_OR_NULL(idev)) {
3331                         if (run_pending)
3332                                 addrconf_dad_run(idev);
3333
3334                         /*
3335                          * If the MTU changed during the interface down,
3336                          * when the interface up, the changed MTU must be
3337                          * reflected in the idev as well as routers.
3338                          */
3339                         if (idev->cnf.mtu6 != dev->mtu &&
3340                             dev->mtu >= IPV6_MIN_MTU) {
3341                                 rt6_mtu_change(dev, dev->mtu);
3342                                 idev->cnf.mtu6 = dev->mtu;
3343                         }
3344                         idev->tstamp = jiffies;
3345                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3346
3347                         /*
3348                          * If the changed mtu during down is lower than
3349                          * IPV6_MIN_MTU stop IPv6 on this interface.
3350                          */
3351                         if (dev->mtu < IPV6_MIN_MTU)
3352                                 addrconf_ifdown(dev, 1);
3353                 }
3354                 break;
3355
3356         case NETDEV_DOWN:
3357         case NETDEV_UNREGISTER:
3358                 /*
3359                  *      Remove all addresses from this interface.
3360                  */
3361                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3362                 break;
3363
3364         case NETDEV_CHANGENAME:
3365                 if (idev) {
3366                         snmp6_unregister_dev(idev);
3367                         addrconf_sysctl_unregister(idev);
3368                         err = addrconf_sysctl_register(idev);
3369                         if (err)
3370                                 return notifier_from_errno(err);
3371                         err = snmp6_register_dev(idev);
3372                         if (err) {
3373                                 addrconf_sysctl_unregister(idev);
3374                                 return notifier_from_errno(err);
3375                         }
3376                 }
3377                 break;
3378
3379         case NETDEV_PRE_TYPE_CHANGE:
3380         case NETDEV_POST_TYPE_CHANGE:
3381                 if (idev)
3382                         addrconf_type_change(dev, event);
3383                 break;
3384         }
3385
3386         return NOTIFY_OK;
3387 }
3388
3389 /*
3390  *      addrconf module should be notified of a device going up
3391  */
3392 static struct notifier_block ipv6_dev_notf = {
3393         .notifier_call = addrconf_notify,
3394 };
3395
3396 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3397 {
3398         struct inet6_dev *idev;
3399         ASSERT_RTNL();
3400
3401         idev = __in6_dev_get(dev);
3402
3403         if (event == NETDEV_POST_TYPE_CHANGE)
3404                 ipv6_mc_remap(idev);
3405         else if (event == NETDEV_PRE_TYPE_CHANGE)
3406                 ipv6_mc_unmap(idev);
3407 }
3408
3409 static int addrconf_ifdown(struct net_device *dev, int how)
3410 {
3411         struct net *net = dev_net(dev);
3412         struct inet6_dev *idev;
3413         struct inet6_ifaddr *ifa, *tmp;
3414         struct list_head del_list;
3415         int _keep_addr;
3416         bool keep_addr;
3417         int state, i;
3418
3419         ASSERT_RTNL();
3420
3421         rt6_ifdown(net, dev);
3422         neigh_ifdown(&nd_tbl, dev);
3423
3424         idev = __in6_dev_get(dev);
3425         if (!idev)
3426                 return -ENODEV;
3427
3428         /*
3429          * Step 1: remove reference to ipv6 device from parent device.
3430          *         Do not dev_put!
3431          */
3432         if (how) {
3433                 idev->dead = 1;
3434
3435                 /* protected by rtnl_lock */
3436                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3437
3438                 /* Step 1.5: remove snmp6 entry */
3439                 snmp6_unregister_dev(idev);
3440
3441         }
3442
3443         /* aggregate the system setting and interface setting */
3444         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3445         if (!_keep_addr)
3446                 _keep_addr = idev->cnf.keep_addr_on_down;
3447
3448         /* combine the user config with event to determine if permanent
3449          * addresses are to be removed from address hash table
3450          */
3451         keep_addr = !(how || _keep_addr <= 0);
3452
3453         /* Step 2: clear hash table */
3454         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3455                 struct hlist_head *h = &inet6_addr_lst[i];
3456
3457                 spin_lock_bh(&addrconf_hash_lock);
3458 restart:
3459                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3460                         if (ifa->idev == idev) {
3461                                 addrconf_del_dad_work(ifa);
3462                                 /* combined flag + permanent flag decide if
3463                                  * address is retained on a down event
3464                                  */
3465                                 if (!keep_addr ||
3466                                     !(ifa->flags & IFA_F_PERMANENT)) {
3467                                         hlist_del_init_rcu(&ifa->addr_lst);
3468                                         goto restart;
3469                                 }
3470                         }
3471                 }
3472                 spin_unlock_bh(&addrconf_hash_lock);
3473         }
3474
3475         write_lock_bh(&idev->lock);
3476
3477         addrconf_del_rs_timer(idev);
3478
3479         /* Step 2: clear flags for stateless addrconf */
3480         if (!how)
3481                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3482
3483         if (how && del_timer(&idev->regen_timer))
3484                 in6_dev_put(idev);
3485
3486         /* Step 3: clear tempaddr list */
3487         while (!list_empty(&idev->tempaddr_list)) {
3488                 ifa = list_first_entry(&idev->tempaddr_list,
3489                                        struct inet6_ifaddr, tmp_list);
3490                 list_del(&ifa->tmp_list);
3491                 write_unlock_bh(&idev->lock);
3492                 spin_lock_bh(&ifa->lock);
3493
3494                 if (ifa->ifpub) {
3495                         in6_ifa_put(ifa->ifpub);
3496                         ifa->ifpub = NULL;
3497                 }
3498                 spin_unlock_bh(&ifa->lock);
3499                 in6_ifa_put(ifa);
3500                 write_lock_bh(&idev->lock);
3501         }
3502
3503         /* re-combine the user config with event to determine if permanent
3504          * addresses are to be removed from the interface list
3505          */
3506         keep_addr = (!how && _keep_addr > 0);
3507
3508         INIT_LIST_HEAD(&del_list);
3509         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3510                 addrconf_del_dad_work(ifa);
3511
3512                 write_unlock_bh(&idev->lock);
3513                 spin_lock_bh(&ifa->lock);
3514
3515                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT)) {
3516                         /* set state to skip the notifier below */
3517                         state = INET6_IFADDR_STATE_DEAD;
3518                         ifa->state = 0;
3519                         if (!(ifa->flags & IFA_F_NODAD))
3520                                 ifa->flags |= IFA_F_TENTATIVE;
3521                 } else {
3522                         state = ifa->state;
3523                         ifa->state = INET6_IFADDR_STATE_DEAD;
3524
3525                         list_del(&ifa->if_list);
3526                         list_add(&ifa->if_list, &del_list);
3527                 }
3528
3529                 spin_unlock_bh(&ifa->lock);
3530
3531                 if (state != INET6_IFADDR_STATE_DEAD) {
3532                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3533                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3534                 }
3535
3536                 write_lock_bh(&idev->lock);
3537         }
3538
3539         write_unlock_bh(&idev->lock);
3540
3541         /* now clean up addresses to be removed */
3542         while (!list_empty(&del_list)) {
3543                 ifa = list_first_entry(&del_list,
3544                                        struct inet6_ifaddr, if_list);
3545                 list_del(&ifa->if_list);
3546
3547                 in6_ifa_put(ifa);
3548         }
3549
3550         /* Step 5: Discard anycast and multicast list */
3551         if (how) {
3552                 ipv6_ac_destroy_dev(idev);
3553                 ipv6_mc_destroy_dev(idev);
3554         } else {
3555                 ipv6_mc_down(idev);
3556         }
3557
3558         idev->tstamp = jiffies;
3559
3560         /* Last: Shot the device (if unregistered) */
3561         if (how) {
3562                 addrconf_sysctl_unregister(idev);
3563                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3564                 neigh_ifdown(&nd_tbl, dev);
3565                 in6_dev_put(idev);
3566         }
3567         return 0;
3568 }
3569
3570 static void addrconf_rs_timer(unsigned long data)
3571 {
3572         struct inet6_dev *idev = (struct inet6_dev *)data;
3573         struct net_device *dev = idev->dev;
3574         struct in6_addr lladdr;
3575
3576         write_lock(&idev->lock);
3577         if (idev->dead || !(idev->if_flags & IF_READY))
3578                 goto out;
3579
3580         if (!ipv6_accept_ra(idev))
3581                 goto out;
3582
3583         /* Announcement received after solicitation was sent */
3584         if (idev->if_flags & IF_RA_RCVD)
3585                 goto out;
3586
3587         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3588                 write_unlock(&idev->lock);
3589                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3590                         ndisc_send_rs(dev, &lladdr,
3591                                       &in6addr_linklocal_allrouters);
3592                 else
3593                         goto put;
3594
3595                 write_lock(&idev->lock);
3596                 /* The wait after the last probe can be shorter */
3597                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3598                                              idev->cnf.rtr_solicits) ?
3599                                       idev->cnf.rtr_solicit_delay :
3600                                       idev->cnf.rtr_solicit_interval);
3601         } else {
3602                 /*
3603                  * Note: we do not support deprecated "all on-link"
3604                  * assumption any longer.
3605                  */
3606                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3607         }
3608
3609 out:
3610         write_unlock(&idev->lock);
3611 put:
3612         in6_dev_put(idev);
3613 }
3614
3615 /*
3616  *      Duplicate Address Detection
3617  */
3618 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3619 {
3620         unsigned long rand_num;
3621         struct inet6_dev *idev = ifp->idev;
3622
3623         if (ifp->flags & IFA_F_OPTIMISTIC)
3624                 rand_num = 0;
3625         else
3626                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3627
3628         ifp->dad_probes = idev->cnf.dad_transmits;
3629         addrconf_mod_dad_work(ifp, rand_num);
3630 }
3631
3632 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3633 {
3634         struct inet6_dev *idev = ifp->idev;
3635         struct net_device *dev = idev->dev;
3636         bool notify = false;
3637
3638         addrconf_join_solict(dev, &ifp->addr);
3639
3640         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3641
3642         read_lock_bh(&idev->lock);
3643         spin_lock(&ifp->lock);
3644         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3645                 goto out;
3646
3647         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3648             idev->cnf.accept_dad < 1 ||
3649             !(ifp->flags&IFA_F_TENTATIVE) ||
3650             ifp->flags & IFA_F_NODAD) {
3651                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3652                 spin_unlock(&ifp->lock);
3653                 read_unlock_bh(&idev->lock);
3654
3655                 addrconf_dad_completed(ifp);
3656                 return;
3657         }
3658
3659         if (!(idev->if_flags & IF_READY)) {
3660                 spin_unlock(&ifp->lock);
3661                 read_unlock_bh(&idev->lock);
3662                 /*
3663                  * If the device is not ready:
3664                  * - keep it tentative if it is a permanent address.
3665                  * - otherwise, kill it.
3666                  */
3667                 in6_ifa_hold(ifp);
3668                 addrconf_dad_stop(ifp, 0);
3669                 return;
3670         }
3671
3672         /*
3673          * Optimistic nodes can start receiving
3674          * Frames right away
3675          */
3676         if (ifp->flags & IFA_F_OPTIMISTIC) {
3677                 ip6_ins_rt(ifp->rt);
3678                 if (ipv6_use_optimistic_addr(idev)) {
3679                         /* Because optimistic nodes can use this address,
3680                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3681                          */
3682                         notify = true;
3683                 }
3684         }
3685
3686         addrconf_dad_kick(ifp);
3687 out:
3688         spin_unlock(&ifp->lock);
3689         read_unlock_bh(&idev->lock);
3690         if (notify)
3691                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3692 }
3693
3694 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3695 {
3696         bool begin_dad = false;
3697
3698         spin_lock_bh(&ifp->lock);
3699         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3700                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3701                 begin_dad = true;
3702         }
3703         spin_unlock_bh(&ifp->lock);
3704
3705         if (begin_dad)
3706                 addrconf_mod_dad_work(ifp, 0);
3707 }
3708
3709 static void addrconf_dad_work(struct work_struct *w)
3710 {
3711         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3712                                                 struct inet6_ifaddr,
3713                                                 dad_work);
3714         struct inet6_dev *idev = ifp->idev;
3715         struct in6_addr mcaddr;
3716
3717         enum {
3718                 DAD_PROCESS,
3719                 DAD_BEGIN,
3720                 DAD_ABORT,
3721         } action = DAD_PROCESS;
3722
3723         rtnl_lock();
3724
3725         spin_lock_bh(&ifp->lock);
3726         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3727                 action = DAD_BEGIN;
3728                 ifp->state = INET6_IFADDR_STATE_DAD;
3729         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3730                 action = DAD_ABORT;
3731                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3732         }
3733         spin_unlock_bh(&ifp->lock);
3734
3735         if (action == DAD_BEGIN) {
3736                 addrconf_dad_begin(ifp);
3737                 goto out;
3738         } else if (action == DAD_ABORT) {
3739                 addrconf_dad_stop(ifp, 1);
3740                 goto out;
3741         }
3742
3743         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3744                 goto out;
3745
3746         write_lock_bh(&idev->lock);
3747         if (idev->dead || !(idev->if_flags & IF_READY)) {
3748                 write_unlock_bh(&idev->lock);
3749                 goto out;
3750         }
3751
3752         spin_lock(&ifp->lock);
3753         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3754                 spin_unlock(&ifp->lock);
3755                 write_unlock_bh(&idev->lock);
3756                 goto out;
3757         }
3758
3759         if (ifp->dad_probes == 0) {
3760                 /*
3761                  * DAD was successful
3762                  */
3763
3764                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3765                 spin_unlock(&ifp->lock);
3766                 write_unlock_bh(&idev->lock);
3767
3768                 addrconf_dad_completed(ifp);
3769
3770                 goto out;
3771         }
3772
3773         ifp->dad_probes--;
3774         addrconf_mod_dad_work(ifp,
3775                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3776         spin_unlock(&ifp->lock);
3777         write_unlock_bh(&idev->lock);
3778
3779         /* send a neighbour solicitation for our addr */
3780         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3781         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3782 out:
3783         in6_ifa_put(ifp);
3784         rtnl_unlock();
3785 }
3786
3787 /* ifp->idev must be at least read locked */
3788 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3789 {
3790         struct inet6_ifaddr *ifpiter;
3791         struct inet6_dev *idev = ifp->idev;
3792
3793         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3794                 if (ifpiter->scope > IFA_LINK)
3795                         break;
3796                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3797                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3798                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3799                     IFA_F_PERMANENT)
3800                         return false;
3801         }
3802         return true;
3803 }
3804
3805 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3806 {
3807         struct net_device *dev = ifp->idev->dev;
3808         struct in6_addr lladdr;
3809         bool send_rs, send_mld;
3810
3811         addrconf_del_dad_work(ifp);
3812
3813         /*
3814          *      Configure the address for reception. Now it is valid.
3815          */
3816
3817         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3818
3819         /* If added prefix is link local and we are prepared to process
3820            router advertisements, start sending router solicitations.
3821          */
3822
3823         read_lock_bh(&ifp->idev->lock);
3824         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3825         send_rs = send_mld &&
3826                   ipv6_accept_ra(ifp->idev) &&
3827                   ifp->idev->cnf.rtr_solicits > 0 &&
3828                   (dev->flags&IFF_LOOPBACK) == 0;
3829         read_unlock_bh(&ifp->idev->lock);
3830
3831         /* While dad is in progress mld report's source address is in6_addrany.
3832          * Resend with proper ll now.
3833          */
3834         if (send_mld)
3835                 ipv6_mc_dad_complete(ifp->idev);
3836
3837         if (send_rs) {
3838                 /*
3839                  *      If a host as already performed a random delay
3840                  *      [...] as part of DAD [...] there is no need
3841                  *      to delay again before sending the first RS
3842                  */
3843                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3844                         return;
3845                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3846
3847                 write_lock_bh(&ifp->idev->lock);
3848                 spin_lock(&ifp->lock);
3849                 ifp->idev->rs_probes = 1;
3850                 ifp->idev->if_flags |= IF_RS_SENT;
3851                 addrconf_mod_rs_timer(ifp->idev,
3852                                       ifp->idev->cnf.rtr_solicit_interval);
3853                 spin_unlock(&ifp->lock);
3854                 write_unlock_bh(&ifp->idev->lock);
3855         }
3856 }
3857
3858 static void addrconf_dad_run(struct inet6_dev *idev)
3859 {
3860         struct inet6_ifaddr *ifp;
3861
3862         read_lock_bh(&idev->lock);
3863         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3864                 spin_lock(&ifp->lock);
3865                 if (ifp->flags & IFA_F_TENTATIVE &&
3866                     ifp->state == INET6_IFADDR_STATE_DAD)
3867                         addrconf_dad_kick(ifp);
3868                 spin_unlock(&ifp->lock);
3869         }
3870         read_unlock_bh(&idev->lock);
3871 }
3872
3873 #ifdef CONFIG_PROC_FS
3874 struct if6_iter_state {
3875         struct seq_net_private p;
3876         int bucket;
3877         int offset;
3878 };
3879
3880 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3881 {
3882         struct inet6_ifaddr *ifa = NULL;
3883         struct if6_iter_state *state = seq->private;
3884         struct net *net = seq_file_net(seq);
3885         int p = 0;
3886
3887         /* initial bucket if pos is 0 */
3888         if (pos == 0) {
3889                 state->bucket = 0;
3890                 state->offset = 0;
3891         }
3892
3893         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3894                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3895                                          addr_lst) {
3896                         if (!net_eq(dev_net(ifa->idev->dev), net))
3897                                 continue;
3898                         /* sync with offset */
3899                         if (p < state->offset) {
3900                                 p++;
3901                                 continue;
3902                         }
3903                         state->offset++;
3904                         return ifa;
3905                 }
3906
3907                 /* prepare for next bucket */
3908                 state->offset = 0;
3909                 p = 0;
3910         }
3911         return NULL;
3912 }
3913
3914 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3915                                          struct inet6_ifaddr *ifa)
3916 {
3917         struct if6_iter_state *state = seq->private;
3918         struct net *net = seq_file_net(seq);
3919
3920         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3921                 if (!net_eq(dev_net(ifa->idev->dev), net))
3922                         continue;
3923                 state->offset++;
3924                 return ifa;
3925         }
3926
3927         while (++state->bucket < IN6_ADDR_HSIZE) {
3928                 state->offset = 0;
3929                 hlist_for_each_entry_rcu_bh(ifa,
3930                                      &inet6_addr_lst[state->bucket], addr_lst) {
3931                         if (!net_eq(dev_net(ifa->idev->dev), net))
3932                                 continue;
3933                         state->offset++;
3934                         return ifa;
3935                 }
3936         }
3937
3938         return NULL;
3939 }
3940
3941 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3942         __acquires(rcu_bh)
3943 {
3944         rcu_read_lock_bh();
3945         return if6_get_first(seq, *pos);
3946 }
3947
3948 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3949 {
3950         struct inet6_ifaddr *ifa;
3951
3952         ifa = if6_get_next(seq, v);
3953         ++*pos;
3954         return ifa;
3955 }
3956
3957 static void if6_seq_stop(struct seq_file *seq, void *v)
3958         __releases(rcu_bh)
3959 {
3960         rcu_read_unlock_bh();
3961 }
3962
3963 static int if6_seq_show(struct seq_file *seq, void *v)
3964 {
3965         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3966         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3967                    &ifp->addr,
3968                    ifp->idev->dev->ifindex,
3969                    ifp->prefix_len,
3970                    ifp->scope,
3971                    (u8) ifp->flags,
3972                    ifp->idev->dev->name);
3973         return 0;
3974 }
3975
3976 static const struct seq_operations if6_seq_ops = {
3977         .start  = if6_seq_start,
3978         .next   = if6_seq_next,
3979         .show   = if6_seq_show,
3980         .stop   = if6_seq_stop,
3981 };
3982
3983 static int if6_seq_open(struct inode *inode, struct file *file)
3984 {
3985         return seq_open_net(inode, file, &if6_seq_ops,
3986                             sizeof(struct if6_iter_state));
3987 }
3988
3989 static const struct file_operations if6_fops = {
3990         .owner          = THIS_MODULE,
3991         .open           = if6_seq_open,
3992         .read           = seq_read,
3993         .llseek         = seq_lseek,
3994         .release        = seq_release_net,
3995 };
3996
3997 static int __net_init if6_proc_net_init(struct net *net)
3998 {
3999         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4000                 return -ENOMEM;
4001         return 0;
4002 }
4003
4004 static void __net_exit if6_proc_net_exit(struct net *net)
4005 {
4006         remove_proc_entry("if_inet6", net->proc_net);
4007 }
4008
4009 static struct pernet_operations if6_proc_net_ops = {
4010         .init = if6_proc_net_init,
4011         .exit = if6_proc_net_exit,
4012 };
4013
4014 int __init if6_proc_init(void)
4015 {
4016         return register_pernet_subsys(&if6_proc_net_ops);
4017 }
4018
4019 void if6_proc_exit(void)
4020 {
4021         unregister_pernet_subsys(&if6_proc_net_ops);
4022 }
4023 #endif  /* CONFIG_PROC_FS */
4024
4025 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4026 /* Check if address is a home address configured on any interface. */
4027 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4028 {
4029         int ret = 0;
4030         struct inet6_ifaddr *ifp = NULL;
4031         unsigned int hash = inet6_addr_hash(addr);
4032
4033         rcu_read_lock_bh();
4034         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4035                 if (!net_eq(dev_net(ifp->idev->dev), net))
4036                         continue;
4037                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4038                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4039                         ret = 1;
4040                         break;
4041                 }
4042         }
4043         rcu_read_unlock_bh();
4044         return ret;
4045 }
4046 #endif
4047
4048 /*
4049  *      Periodic address status verification
4050  */
4051
4052 static void addrconf_verify_rtnl(void)
4053 {
4054         unsigned long now, next, next_sec, next_sched;
4055         struct inet6_ifaddr *ifp;
4056         int i;
4057
4058         ASSERT_RTNL();
4059
4060         rcu_read_lock_bh();
4061         now = jiffies;
4062         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4063
4064         cancel_delayed_work(&addr_chk_work);
4065
4066         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4067 restart:
4068                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4069                         unsigned long age;
4070
4071                         /* When setting preferred_lft to a value not zero or
4072                          * infinity, while valid_lft is infinity
4073                          * IFA_F_PERMANENT has a non-infinity life time.
4074                          */
4075                         if ((ifp->flags & IFA_F_PERMANENT) &&
4076                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4077                                 continue;
4078
4079                         spin_lock(&ifp->lock);
4080                         /* We try to batch several events at once. */
4081                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4082
4083                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4084                             age >= ifp->valid_lft) {
4085                                 spin_unlock(&ifp->lock);
4086                                 in6_ifa_hold(ifp);
4087                                 ipv6_del_addr(ifp);
4088                                 goto restart;
4089                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4090                                 spin_unlock(&ifp->lock);
4091                                 continue;
4092                         } else if (age >= ifp->prefered_lft) {
4093                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4094                                 int deprecate = 0;
4095
4096                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4097                                         deprecate = 1;
4098                                         ifp->flags |= IFA_F_DEPRECATED;
4099                                 }
4100
4101                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4102                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4103                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4104
4105                                 spin_unlock(&ifp->lock);
4106
4107                                 if (deprecate) {
4108                                         in6_ifa_hold(ifp);
4109
4110                                         ipv6_ifa_notify(0, ifp);
4111                                         in6_ifa_put(ifp);
4112                                         goto restart;
4113                                 }
4114                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4115                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4116                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4117                                         ifp->idev->cnf.dad_transmits *
4118                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4119
4120                                 if (age >= ifp->prefered_lft - regen_advance) {
4121                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4122                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4123                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4124                                         if (!ifp->regen_count && ifpub) {
4125                                                 ifp->regen_count++;
4126                                                 in6_ifa_hold(ifp);
4127                                                 in6_ifa_hold(ifpub);
4128                                                 spin_unlock(&ifp->lock);
4129
4130                                                 spin_lock(&ifpub->lock);
4131                                                 ifpub->regen_count = 0;
4132                                                 spin_unlock(&ifpub->lock);
4133                                                 ipv6_create_tempaddr(ifpub, ifp);
4134                                                 in6_ifa_put(ifpub);
4135                                                 in6_ifa_put(ifp);
4136                                                 goto restart;
4137                                         }
4138                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4139                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4140                                 spin_unlock(&ifp->lock);
4141                         } else {
4142                                 /* ifp->prefered_lft <= ifp->valid_lft */
4143                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4144                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4145                                 spin_unlock(&ifp->lock);
4146                         }
4147                 }
4148         }
4149
4150         next_sec = round_jiffies_up(next);
4151         next_sched = next;
4152
4153         /* If rounded timeout is accurate enough, accept it. */
4154         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4155                 next_sched = next_sec;
4156
4157         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4158         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4159                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4160
4161         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4162               now, next, next_sec, next_sched);
4163         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4164         rcu_read_unlock_bh();
4165 }
4166
4167 static void addrconf_verify_work(struct work_struct *w)
4168 {
4169         rtnl_lock();
4170         addrconf_verify_rtnl();
4171         rtnl_unlock();
4172 }
4173
4174 static void addrconf_verify(void)
4175 {
4176         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4177 }
4178
4179 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4180                                      struct in6_addr **peer_pfx)
4181 {
4182         struct in6_addr *pfx = NULL;
4183
4184         *peer_pfx = NULL;
4185
4186         if (addr)
4187                 pfx = nla_data(addr);
4188
4189         if (local) {
4190                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4191                         *peer_pfx = pfx;
4192                 pfx = nla_data(local);
4193         }
4194
4195         return pfx;
4196 }
4197
4198 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4199         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4200         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4201         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4202         [IFA_FLAGS]             = { .len = sizeof(u32) },
4203 };
4204
4205 static int
4206 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4207 {
4208         struct net *net = sock_net(skb->sk);
4209         struct ifaddrmsg *ifm;
4210         struct nlattr *tb[IFA_MAX+1];
4211         struct in6_addr *pfx, *peer_pfx;
4212         u32 ifa_flags;
4213         int err;
4214
4215         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4216         if (err < 0)
4217                 return err;
4218
4219         ifm = nlmsg_data(nlh);
4220         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4221         if (!pfx)
4222                 return -EINVAL;
4223
4224         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4225
4226         /* We ignore other flags so far. */
4227         ifa_flags &= IFA_F_MANAGETEMPADDR;
4228
4229         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4230                               ifm->ifa_prefixlen);
4231 }
4232
4233 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4234                              u32 prefered_lft, u32 valid_lft)
4235 {
4236         u32 flags;
4237         clock_t expires;
4238         unsigned long timeout;
4239         bool was_managetempaddr;
4240         bool had_prefixroute;
4241
4242         ASSERT_RTNL();
4243
4244         if (!valid_lft || (prefered_lft > valid_lft))
4245                 return -EINVAL;
4246
4247         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4248             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4249                 return -EINVAL;
4250
4251         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4252         if (addrconf_finite_timeout(timeout)) {
4253                 expires = jiffies_to_clock_t(timeout * HZ);
4254                 valid_lft = timeout;
4255                 flags = RTF_EXPIRES;
4256         } else {
4257                 expires = 0;
4258                 flags = 0;
4259                 ifa_flags |= IFA_F_PERMANENT;
4260         }
4261
4262         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4263         if (addrconf_finite_timeout(timeout)) {
4264                 if (timeout == 0)
4265                         ifa_flags |= IFA_F_DEPRECATED;
4266                 prefered_lft = timeout;
4267         }
4268
4269         spin_lock_bh(&ifp->lock);
4270         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4271         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4272                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4273         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4274                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4275                         IFA_F_NOPREFIXROUTE);
4276         ifp->flags |= ifa_flags;
4277         ifp->tstamp = jiffies;
4278         ifp->valid_lft = valid_lft;
4279         ifp->prefered_lft = prefered_lft;
4280
4281         spin_unlock_bh(&ifp->lock);
4282         if (!(ifp->flags&IFA_F_TENTATIVE))
4283                 ipv6_ifa_notify(0, ifp);
4284
4285         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4286                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4287                                       expires, flags);
4288         } else if (had_prefixroute) {
4289                 enum cleanup_prefix_rt_t action;
4290                 unsigned long rt_expires;
4291
4292                 write_lock_bh(&ifp->idev->lock);
4293                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4294                 write_unlock_bh(&ifp->idev->lock);
4295
4296                 if (action != CLEANUP_PREFIX_RT_NOP) {
4297                         cleanup_prefix_route(ifp, rt_expires,
4298                                 action == CLEANUP_PREFIX_RT_DEL);
4299                 }
4300         }
4301
4302         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4303                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4304                         valid_lft = prefered_lft = 0;
4305                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4306                                  !was_managetempaddr, jiffies);
4307         }
4308
4309         addrconf_verify_rtnl();
4310
4311         return 0;
4312 }
4313
4314 static int
4315 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4316 {
4317         struct net *net = sock_net(skb->sk);
4318         struct ifaddrmsg *ifm;
4319         struct nlattr *tb[IFA_MAX+1];
4320         struct in6_addr *pfx, *peer_pfx;
4321         struct inet6_ifaddr *ifa;
4322         struct net_device *dev;
4323         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4324         u32 ifa_flags;
4325         int err;
4326
4327         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4328         if (err < 0)
4329                 return err;
4330
4331         ifm = nlmsg_data(nlh);
4332         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4333         if (!pfx)
4334                 return -EINVAL;
4335
4336         if (tb[IFA_CACHEINFO]) {
4337                 struct ifa_cacheinfo *ci;
4338
4339                 ci = nla_data(tb[IFA_CACHEINFO]);
4340                 valid_lft = ci->ifa_valid;
4341                 preferred_lft = ci->ifa_prefered;
4342         } else {
4343                 preferred_lft = INFINITY_LIFE_TIME;
4344                 valid_lft = INFINITY_LIFE_TIME;
4345         }
4346
4347         dev =  __dev_get_by_index(net, ifm->ifa_index);
4348         if (!dev)
4349                 return -ENODEV;
4350
4351         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4352
4353         /* We ignore other flags so far. */
4354         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4355                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4356
4357         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4358         if (!ifa) {
4359                 /*
4360                  * It would be best to check for !NLM_F_CREATE here but
4361                  * userspace already relies on not having to provide this.
4362                  */
4363                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4364                                       ifm->ifa_prefixlen, ifa_flags,
4365                                       preferred_lft, valid_lft);
4366         }
4367
4368         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4369             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4370                 err = -EEXIST;
4371         else
4372                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4373
4374         in6_ifa_put(ifa);
4375
4376         return err;
4377 }
4378
4379 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4380                           u8 scope, int ifindex)
4381 {
4382         struct ifaddrmsg *ifm;
4383
4384         ifm = nlmsg_data(nlh);
4385         ifm->ifa_family = AF_INET6;
4386         ifm->ifa_prefixlen = prefixlen;
4387         ifm->ifa_flags = flags;
4388         ifm->ifa_scope = scope;
4389         ifm->ifa_index = ifindex;
4390 }
4391
4392 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4393                          unsigned long tstamp, u32 preferred, u32 valid)
4394 {
4395         struct ifa_cacheinfo ci;
4396
4397         ci.cstamp = cstamp_delta(cstamp);
4398         ci.tstamp = cstamp_delta(tstamp);
4399         ci.ifa_prefered = preferred;
4400         ci.ifa_valid = valid;
4401
4402         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4403 }
4404
4405 static inline int rt_scope(int ifa_scope)
4406 {
4407         if (ifa_scope & IFA_HOST)
4408                 return RT_SCOPE_HOST;
4409         else if (ifa_scope & IFA_LINK)
4410                 return RT_SCOPE_LINK;
4411         else if (ifa_scope & IFA_SITE)
4412                 return RT_SCOPE_SITE;
4413         else
4414                 return RT_SCOPE_UNIVERSE;
4415 }
4416
4417 static inline int inet6_ifaddr_msgsize(void)
4418 {
4419         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4420                + nla_total_size(16) /* IFA_LOCAL */
4421                + nla_total_size(16) /* IFA_ADDRESS */
4422                + nla_total_size(sizeof(struct ifa_cacheinfo))
4423                + nla_total_size(4)  /* IFA_FLAGS */;
4424 }
4425
4426 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4427                              u32 portid, u32 seq, int event, unsigned int flags)
4428 {
4429         struct nlmsghdr  *nlh;
4430         u32 preferred, valid;
4431
4432         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4433         if (!nlh)
4434                 return -EMSGSIZE;
4435
4436         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4437                       ifa->idev->dev->ifindex);
4438
4439         if (!((ifa->flags&IFA_F_PERMANENT) &&
4440               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4441                 preferred = ifa->prefered_lft;
4442                 valid = ifa->valid_lft;
4443                 if (preferred != INFINITY_LIFE_TIME) {
4444                         long tval = (jiffies - ifa->tstamp)/HZ;
4445                         if (preferred > tval)
4446                                 preferred -= tval;
4447                         else
4448                                 preferred = 0;
4449                         if (valid != INFINITY_LIFE_TIME) {
4450                                 if (valid > tval)
4451                                         valid -= tval;
4452                                 else
4453                                         valid = 0;
4454                         }
4455                 }
4456         } else {
4457                 preferred = INFINITY_LIFE_TIME;
4458                 valid = INFINITY_LIFE_TIME;
4459         }
4460
4461         if (!ipv6_addr_any(&ifa->peer_addr)) {
4462                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4463                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4464                         goto error;
4465         } else
4466                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4467                         goto error;
4468
4469         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4470                 goto error;
4471
4472         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4473                 goto error;
4474
4475         nlmsg_end(skb, nlh);
4476         return 0;
4477
4478 error:
4479         nlmsg_cancel(skb, nlh);
4480         return -EMSGSIZE;
4481 }
4482
4483 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4484                                 u32 portid, u32 seq, int event, u16 flags)
4485 {
4486         struct nlmsghdr  *nlh;
4487         u8 scope = RT_SCOPE_UNIVERSE;
4488         int ifindex = ifmca->idev->dev->ifindex;
4489
4490         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4491                 scope = RT_SCOPE_SITE;
4492
4493         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4494         if (!nlh)
4495                 return -EMSGSIZE;
4496
4497         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4498         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4499             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4500                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4501                 nlmsg_cancel(skb, nlh);
4502                 return -EMSGSIZE;
4503         }
4504
4505         nlmsg_end(skb, nlh);
4506         return 0;
4507 }
4508
4509 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4510                                 u32 portid, u32 seq, int event, unsigned int flags)
4511 {
4512         struct nlmsghdr  *nlh;
4513         u8 scope = RT_SCOPE_UNIVERSE;
4514         int ifindex = ifaca->aca_idev->dev->ifindex;
4515
4516         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4517                 scope = RT_SCOPE_SITE;
4518
4519         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4520         if (!nlh)
4521                 return -EMSGSIZE;
4522
4523         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4524         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4525             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4526                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4527                 nlmsg_cancel(skb, nlh);
4528                 return -EMSGSIZE;
4529         }
4530
4531         nlmsg_end(skb, nlh);
4532         return 0;
4533 }
4534
4535 enum addr_type_t {
4536         UNICAST_ADDR,
4537         MULTICAST_ADDR,
4538         ANYCAST_ADDR,
4539 };
4540
4541 /* called with rcu_read_lock() */
4542 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4543                           struct netlink_callback *cb, enum addr_type_t type,
4544                           int s_ip_idx, int *p_ip_idx)
4545 {
4546         struct ifmcaddr6 *ifmca;
4547         struct ifacaddr6 *ifaca;
4548         int err = 1;
4549         int ip_idx = *p_ip_idx;
4550
4551         read_lock_bh(&idev->lock);
4552         switch (type) {
4553         case UNICAST_ADDR: {
4554                 struct inet6_ifaddr *ifa;
4555
4556                 /* unicast address incl. temp addr */
4557                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4558                         if (++ip_idx < s_ip_idx)
4559                                 continue;
4560                         err = inet6_fill_ifaddr(skb, ifa,
4561                                                 NETLINK_CB(cb->skb).portid,
4562                                                 cb->nlh->nlmsg_seq,
4563                                                 RTM_NEWADDR,
4564                                                 NLM_F_MULTI);
4565                         if (err < 0)
4566                                 break;
4567                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4568                 }
4569                 break;
4570         }
4571         case MULTICAST_ADDR:
4572                 /* multicast address */
4573                 for (ifmca = idev->mc_list; ifmca;
4574                      ifmca = ifmca->next, ip_idx++) {
4575                         if (ip_idx < s_ip_idx)
4576                                 continue;
4577                         err = inet6_fill_ifmcaddr(skb, ifmca,
4578                                                   NETLINK_CB(cb->skb).portid,
4579                                                   cb->nlh->nlmsg_seq,
4580                                                   RTM_GETMULTICAST,
4581                                                   NLM_F_MULTI);
4582                         if (err < 0)
4583                                 break;
4584                 }
4585                 break;
4586         case ANYCAST_ADDR:
4587                 /* anycast address */
4588                 for (ifaca = idev->ac_list; ifaca;
4589                      ifaca = ifaca->aca_next, ip_idx++) {
4590                         if (ip_idx < s_ip_idx)
4591                                 continue;
4592                         err = inet6_fill_ifacaddr(skb, ifaca,
4593                                                   NETLINK_CB(cb->skb).portid,
4594                                                   cb->nlh->nlmsg_seq,
4595                                                   RTM_GETANYCAST,
4596                                                   NLM_F_MULTI);
4597                         if (err < 0)
4598                                 break;
4599                 }
4600                 break;
4601         default:
4602                 break;
4603         }
4604         read_unlock_bh(&idev->lock);
4605         *p_ip_idx = ip_idx;
4606         return err;
4607 }
4608
4609 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4610                            enum addr_type_t type)
4611 {
4612         struct net *net = sock_net(skb->sk);
4613         int h, s_h;
4614         int idx, ip_idx;
4615         int s_idx, s_ip_idx;
4616         struct net_device *dev;
4617         struct inet6_dev *idev;
4618         struct hlist_head *head;
4619
4620         s_h = cb->args[0];
4621         s_idx = idx = cb->args[1];
4622         s_ip_idx = ip_idx = cb->args[2];
4623
4624         rcu_read_lock();
4625         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4626         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4627                 idx = 0;
4628                 head = &net->dev_index_head[h];
4629                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4630                         if (idx < s_idx)
4631                                 goto cont;
4632                         if (h > s_h || idx > s_idx)
4633                                 s_ip_idx = 0;
4634                         ip_idx = 0;
4635                         idev = __in6_dev_get(dev);
4636                         if (!idev)
4637                                 goto cont;
4638
4639                         if (in6_dump_addrs(idev, skb, cb, type,
4640                                            s_ip_idx, &ip_idx) < 0)
4641                                 goto done;
4642 cont:
4643                         idx++;
4644                 }
4645         }
4646 done:
4647         rcu_read_unlock();
4648         cb->args[0] = h;
4649         cb->args[1] = idx;
4650         cb->args[2] = ip_idx;
4651
4652         return skb->len;
4653 }
4654
4655 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4656 {
4657         enum addr_type_t type = UNICAST_ADDR;
4658
4659         return inet6_dump_addr(skb, cb, type);
4660 }
4661
4662 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4663 {
4664         enum addr_type_t type = MULTICAST_ADDR;
4665
4666         return inet6_dump_addr(skb, cb, type);
4667 }
4668
4669
4670 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4671 {
4672         enum addr_type_t type = ANYCAST_ADDR;
4673
4674         return inet6_dump_addr(skb, cb, type);
4675 }
4676
4677 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4678 {
4679         struct net *net = sock_net(in_skb->sk);
4680         struct ifaddrmsg *ifm;
4681         struct nlattr *tb[IFA_MAX+1];
4682         struct in6_addr *addr = NULL, *peer;
4683         struct net_device *dev = NULL;
4684         struct inet6_ifaddr *ifa;
4685         struct sk_buff *skb;
4686         int err;
4687
4688         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4689         if (err < 0)
4690                 goto errout;
4691
4692         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4693         if (!addr) {
4694                 err = -EINVAL;
4695                 goto errout;
4696         }
4697
4698         ifm = nlmsg_data(nlh);
4699         if (ifm->ifa_index)
4700                 dev = __dev_get_by_index(net, ifm->ifa_index);
4701
4702         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4703         if (!ifa) {
4704                 err = -EADDRNOTAVAIL;
4705                 goto errout;
4706         }
4707
4708         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4709         if (!skb) {
4710                 err = -ENOBUFS;
4711                 goto errout_ifa;
4712         }
4713
4714         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4715                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4716         if (err < 0) {
4717                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4718                 WARN_ON(err == -EMSGSIZE);
4719                 kfree_skb(skb);
4720                 goto errout_ifa;
4721         }
4722         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4723 errout_ifa:
4724         in6_ifa_put(ifa);
4725 errout:
4726         return err;
4727 }
4728
4729 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4730 {
4731         struct sk_buff *skb;
4732         struct net *net = dev_net(ifa->idev->dev);
4733         int err = -ENOBUFS;
4734
4735         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4736         if (!skb)
4737                 goto errout;
4738
4739         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4740         if (err < 0) {
4741                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4742                 WARN_ON(err == -EMSGSIZE);
4743                 kfree_skb(skb);
4744                 goto errout;
4745         }
4746         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4747         return;
4748 errout:
4749         if (err < 0)
4750                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4751 }
4752
4753 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4754                                 __s32 *array, int bytes)
4755 {
4756         BUG_ON(bytes < (DEVCONF_MAX * 4));
4757
4758         memset(array, 0, bytes);
4759         array[DEVCONF_FORWARDING] = cnf->forwarding;
4760         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4761         array[DEVCONF_MTU6] = cnf->mtu6;
4762         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4763         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4764         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4765         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4766         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4767         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4768                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4769         array[DEVCONF_RTR_SOLICIT_DELAY] =
4770                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4771         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4772         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4773                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4774         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4775                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4776         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4777         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4778         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4779         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4780         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4781         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4782         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4783         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4784         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4785 #ifdef CONFIG_IPV6_ROUTER_PREF
4786         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4787         array[DEVCONF_RTR_PROBE_INTERVAL] =
4788                 jiffies_to_msecs(cnf->rtr_probe_interval);
4789 #ifdef CONFIG_IPV6_ROUTE_INFO
4790         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4791 #endif
4792 #endif
4793         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4794         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4795 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4796         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4797         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4798 #endif
4799 #ifdef CONFIG_IPV6_MROUTE
4800         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4801 #endif
4802         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4803         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4804         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4805         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4806         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4807         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4808         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4809         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4810         /* we omit DEVCONF_STABLE_SECRET for now */
4811         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4812         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4813         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4814         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4815 }
4816
4817 static inline size_t inet6_ifla6_size(void)
4818 {
4819         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4820              + nla_total_size(sizeof(struct ifla_cacheinfo))
4821              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4822              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4823              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4824              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4825 }
4826
4827 static inline size_t inet6_if_nlmsg_size(void)
4828 {
4829         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4830                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4831                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4832                + nla_total_size(4) /* IFLA_MTU */
4833                + nla_total_size(4) /* IFLA_LINK */
4834                + nla_total_size(1) /* IFLA_OPERSTATE */
4835                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4836 }
4837
4838 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4839                                       int items, int bytes)
4840 {
4841         int i;
4842         int pad = bytes - sizeof(u64) * items;
4843         BUG_ON(pad < 0);
4844
4845         /* Use put_unaligned() because stats may not be aligned for u64. */
4846         put_unaligned(items, &stats[0]);
4847         for (i = 1; i < items; i++)
4848                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4849
4850         memset(&stats[items], 0, pad);
4851 }
4852
4853 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4854                                         int bytes, size_t syncpoff)
4855 {
4856         int i, c;
4857         u64 buff[IPSTATS_MIB_MAX];
4858         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4859
4860         BUG_ON(pad < 0);
4861
4862         memset(buff, 0, sizeof(buff));
4863         buff[0] = IPSTATS_MIB_MAX;
4864
4865         for_each_possible_cpu(c) {
4866                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4867                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4868         }
4869
4870         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4871         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4872 }
4873
4874 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4875                              int bytes)
4876 {
4877         switch (attrtype) {
4878         case IFLA_INET6_STATS:
4879                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4880                                      offsetof(struct ipstats_mib, syncp));
4881                 break;
4882         case IFLA_INET6_ICMP6STATS:
4883                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4884                 break;
4885         }
4886 }
4887
4888 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4889                                   u32 ext_filter_mask)
4890 {
4891         struct nlattr *nla;
4892         struct ifla_cacheinfo ci;
4893
4894         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4895                 goto nla_put_failure;
4896         ci.max_reasm_len = IPV6_MAXPLEN;
4897         ci.tstamp = cstamp_delta(idev->tstamp);
4898         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4899         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4900         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4901                 goto nla_put_failure;
4902         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4903         if (!nla)
4904                 goto nla_put_failure;
4905         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4906
4907         /* XXX - MC not implemented */
4908
4909         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4910                 return 0;
4911
4912         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4913         if (!nla)
4914                 goto nla_put_failure;
4915         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4916
4917         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4918         if (!nla)
4919                 goto nla_put_failure;
4920         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4921
4922         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4923         if (!nla)
4924                 goto nla_put_failure;
4925
4926         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4927                 goto nla_put_failure;
4928
4929         read_lock_bh(&idev->lock);
4930         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4931         read_unlock_bh(&idev->lock);
4932
4933         return 0;
4934
4935 nla_put_failure:
4936         return -EMSGSIZE;
4937 }
4938
4939 static size_t inet6_get_link_af_size(const struct net_device *dev,
4940                                      u32 ext_filter_mask)
4941 {
4942         if (!__in6_dev_get(dev))
4943                 return 0;
4944
4945         return inet6_ifla6_size();
4946 }
4947
4948 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4949                               u32 ext_filter_mask)
4950 {
4951         struct inet6_dev *idev = __in6_dev_get(dev);
4952
4953         if (!idev)
4954                 return -ENODATA;
4955
4956         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4957                 return -EMSGSIZE;
4958
4959         return 0;
4960 }
4961
4962 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4963 {
4964         struct inet6_ifaddr *ifp;
4965         struct net_device *dev = idev->dev;
4966         bool update_rs = false;
4967         struct in6_addr ll_addr;
4968
4969         ASSERT_RTNL();
4970
4971         if (!token)
4972                 return -EINVAL;
4973         if (ipv6_addr_any(token))
4974                 return -EINVAL;
4975         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4976                 return -EINVAL;
4977         if (!ipv6_accept_ra(idev))
4978                 return -EINVAL;
4979         if (idev->cnf.rtr_solicits <= 0)
4980                 return -EINVAL;
4981
4982         write_lock_bh(&idev->lock);
4983
4984         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4985         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4986
4987         write_unlock_bh(&idev->lock);
4988
4989         if (!idev->dead && (idev->if_flags & IF_READY) &&
4990             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4991                              IFA_F_OPTIMISTIC)) {
4992
4993                 /* If we're not ready, then normal ifup will take care
4994                  * of this. Otherwise, we need to request our rs here.
4995                  */
4996                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4997                 update_rs = true;
4998         }
4999
5000         write_lock_bh(&idev->lock);
5001
5002         if (update_rs) {
5003                 idev->if_flags |= IF_RS_SENT;
5004                 idev->rs_probes = 1;
5005                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5006         }
5007
5008         /* Well, that's kinda nasty ... */
5009         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5010                 spin_lock(&ifp->lock);
5011                 if (ifp->tokenized) {
5012                         ifp->valid_lft = 0;
5013                         ifp->prefered_lft = 0;
5014                 }
5015                 spin_unlock(&ifp->lock);
5016         }
5017
5018         write_unlock_bh(&idev->lock);
5019         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5020         addrconf_verify_rtnl();
5021         return 0;
5022 }
5023
5024 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5025         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5026         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5027 };
5028
5029 static int inet6_validate_link_af(const struct net_device *dev,
5030                                   const struct nlattr *nla)
5031 {
5032         struct nlattr *tb[IFLA_INET6_MAX + 1];
5033
5034         if (dev && !__in6_dev_get(dev))
5035                 return -EAFNOSUPPORT;
5036
5037         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5038 }
5039
5040 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5041 {
5042         int err = -EINVAL;
5043         struct inet6_dev *idev = __in6_dev_get(dev);
5044         struct nlattr *tb[IFLA_INET6_MAX + 1];
5045
5046         if (!idev)
5047                 return -EAFNOSUPPORT;
5048
5049         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5050                 BUG();
5051
5052         if (tb[IFLA_INET6_TOKEN]) {
5053                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5054                 if (err)
5055                         return err;
5056         }
5057
5058         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5059                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5060
5061                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5062                     mode != IN6_ADDR_GEN_MODE_NONE &&
5063                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5064                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5065                         return -EINVAL;
5066
5067                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5068                     !idev->cnf.stable_secret.initialized &&
5069                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5070                         return -EINVAL;
5071
5072                 idev->addr_gen_mode = mode;
5073                 err = 0;
5074         }
5075
5076         return err;
5077 }
5078
5079 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5080                              u32 portid, u32 seq, int event, unsigned int flags)
5081 {
5082         struct net_device *dev = idev->dev;
5083         struct ifinfomsg *hdr;
5084         struct nlmsghdr *nlh;
5085         void *protoinfo;
5086
5087         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5088         if (!nlh)
5089                 return -EMSGSIZE;
5090
5091         hdr = nlmsg_data(nlh);
5092         hdr->ifi_family = AF_INET6;
5093         hdr->__ifi_pad = 0;
5094         hdr->ifi_type = dev->type;
5095         hdr->ifi_index = dev->ifindex;
5096         hdr->ifi_flags = dev_get_flags(dev);
5097         hdr->ifi_change = 0;
5098
5099         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5100             (dev->addr_len &&
5101              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5102             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5103             (dev->ifindex != dev_get_iflink(dev) &&
5104              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5105             nla_put_u8(skb, IFLA_OPERSTATE,
5106                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5107                 goto nla_put_failure;
5108         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5109         if (!protoinfo)
5110                 goto nla_put_failure;
5111
5112         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5113                 goto nla_put_failure;
5114
5115         nla_nest_end(skb, protoinfo);
5116         nlmsg_end(skb, nlh);
5117         return 0;
5118
5119 nla_put_failure:
5120         nlmsg_cancel(skb, nlh);
5121         return -EMSGSIZE;
5122 }
5123
5124 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5125 {
5126         struct net *net = sock_net(skb->sk);
5127         int h, s_h;
5128         int idx = 0, s_idx;
5129         struct net_device *dev;
5130         struct inet6_dev *idev;
5131         struct hlist_head *head;
5132
5133         s_h = cb->args[0];
5134         s_idx = cb->args[1];
5135
5136         rcu_read_lock();
5137         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5138                 idx = 0;
5139                 head = &net->dev_index_head[h];
5140                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5141                         if (idx < s_idx)
5142                                 goto cont;
5143                         idev = __in6_dev_get(dev);
5144                         if (!idev)
5145                                 goto cont;
5146                         if (inet6_fill_ifinfo(skb, idev,
5147                                               NETLINK_CB(cb->skb).portid,
5148                                               cb->nlh->nlmsg_seq,
5149                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5150                                 goto out;
5151 cont:
5152                         idx++;
5153                 }
5154         }
5155 out:
5156         rcu_read_unlock();
5157         cb->args[1] = idx;
5158         cb->args[0] = h;
5159
5160         return skb->len;
5161 }
5162
5163 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5164 {
5165         struct sk_buff *skb;
5166         struct net *net = dev_net(idev->dev);
5167         int err = -ENOBUFS;
5168
5169         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5170         if (!skb)
5171                 goto errout;
5172
5173         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5174         if (err < 0) {
5175                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5176                 WARN_ON(err == -EMSGSIZE);
5177                 kfree_skb(skb);
5178                 goto errout;
5179         }
5180         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5181         return;
5182 errout:
5183         if (err < 0)
5184                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5185 }
5186
5187 static inline size_t inet6_prefix_nlmsg_size(void)
5188 {
5189         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5190                + nla_total_size(sizeof(struct in6_addr))
5191                + nla_total_size(sizeof(struct prefix_cacheinfo));
5192 }
5193
5194 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5195                              struct prefix_info *pinfo, u32 portid, u32 seq,
5196                              int event, unsigned int flags)
5197 {
5198         struct prefixmsg *pmsg;
5199         struct nlmsghdr *nlh;
5200         struct prefix_cacheinfo ci;
5201
5202         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5203         if (!nlh)
5204                 return -EMSGSIZE;
5205
5206         pmsg = nlmsg_data(nlh);
5207         pmsg->prefix_family = AF_INET6;
5208         pmsg->prefix_pad1 = 0;
5209         pmsg->prefix_pad2 = 0;
5210         pmsg->prefix_ifindex = idev->dev->ifindex;
5211         pmsg->prefix_len = pinfo->prefix_len;
5212         pmsg->prefix_type = pinfo->type;
5213         pmsg->prefix_pad3 = 0;
5214         pmsg->prefix_flags = 0;
5215         if (pinfo->onlink)
5216                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5217         if (pinfo->autoconf)
5218                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5219
5220         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5221                 goto nla_put_failure;
5222         ci.preferred_time = ntohl(pinfo->prefered);
5223         ci.valid_time = ntohl(pinfo->valid);
5224         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5225                 goto nla_put_failure;
5226         nlmsg_end(skb, nlh);
5227         return 0;
5228
5229 nla_put_failure:
5230         nlmsg_cancel(skb, nlh);
5231         return -EMSGSIZE;
5232 }
5233
5234 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5235                          struct prefix_info *pinfo)
5236 {
5237         struct sk_buff *skb;
5238         struct net *net = dev_net(idev->dev);
5239         int err = -ENOBUFS;
5240
5241         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5242         if (!skb)
5243                 goto errout;
5244
5245         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5246         if (err < 0) {
5247                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5248                 WARN_ON(err == -EMSGSIZE);
5249                 kfree_skb(skb);
5250                 goto errout;
5251         }
5252         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5253         return;
5254 errout:
5255         if (err < 0)
5256                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5257 }
5258
5259 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5260 {
5261         struct net *net = dev_net(ifp->idev->dev);
5262
5263         if (event)
5264                 ASSERT_RTNL();
5265
5266         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5267
5268         switch (event) {
5269         case RTM_NEWADDR:
5270                 /*
5271                  * If the address was optimistic
5272                  * we inserted the route at the start of
5273                  * our DAD process, so we don't need
5274                  * to do it again
5275                  */
5276                 if (!(ifp->rt->rt6i_node))
5277                         ip6_ins_rt(ifp->rt);
5278                 if (ifp->idev->cnf.forwarding)
5279                         addrconf_join_anycast(ifp);
5280                 if (!ipv6_addr_any(&ifp->peer_addr))
5281                         addrconf_prefix_route(&ifp->peer_addr, 128,
5282                                               ifp->idev->dev, 0, 0);
5283                 break;
5284         case RTM_DELADDR:
5285                 if (ifp->idev->cnf.forwarding)
5286                         addrconf_leave_anycast(ifp);
5287                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5288                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5289                         struct rt6_info *rt;
5290
5291                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5292                                                        ifp->idev->dev, 0, 0);
5293                         if (rt)
5294                                 ip6_del_rt(rt);
5295                 }
5296                 if (ifp->rt) {
5297                         dst_hold(&ifp->rt->dst);
5298
5299                         ip6_del_rt(ifp->rt);
5300                         ifp->rt = NULL;
5301                 }
5302                 rt_genid_bump_ipv6(net);
5303                 break;
5304         }
5305         atomic_inc(&net->ipv6.dev_addr_genid);
5306 }
5307
5308 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5309 {
5310         rcu_read_lock_bh();
5311         if (likely(ifp->idev->dead == 0))
5312                 __ipv6_ifa_notify(event, ifp);
5313         rcu_read_unlock_bh();
5314 }
5315
5316 #ifdef CONFIG_SYSCTL
5317
5318 static
5319 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5320                            void __user *buffer, size_t *lenp, loff_t *ppos)
5321 {
5322         int *valp = ctl->data;
5323         int val = *valp;
5324         loff_t pos = *ppos;
5325         struct ctl_table lctl;
5326         int ret;
5327
5328         /*
5329          * ctl->data points to idev->cnf.forwarding, we should
5330          * not modify it until we get the rtnl lock.
5331          */
5332         lctl = *ctl;
5333         lctl.data = &val;
5334
5335         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5336
5337         if (write)
5338                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5339         if (ret)
5340                 *ppos = pos;
5341         return ret;
5342 }
5343
5344 static
5345 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5346                               void __user *buffer, size_t *lenp, loff_t *ppos)
5347 {
5348         struct ctl_table lctl;
5349         int min_hl = 1, max_hl = 255;
5350
5351         lctl = *ctl;
5352         lctl.extra1 = &min_hl;
5353         lctl.extra2 = &max_hl;
5354
5355         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5356 }
5357
5358 static
5359 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5360                         void __user *buffer, size_t *lenp, loff_t *ppos)
5361 {
5362         struct inet6_dev *idev = ctl->extra1;
5363         int min_mtu = IPV6_MIN_MTU;
5364         struct ctl_table lctl;
5365
5366         lctl = *ctl;
5367         lctl.extra1 = &min_mtu;
5368         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5369
5370         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5371 }
5372
5373 static void dev_disable_change(struct inet6_dev *idev)
5374 {
5375         struct netdev_notifier_info info;
5376
5377         if (!idev || !idev->dev)
5378                 return;
5379
5380         netdev_notifier_info_init(&info, idev->dev);
5381         if (idev->cnf.disable_ipv6)
5382                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5383         else
5384                 addrconf_notify(NULL, NETDEV_UP, &info);
5385 }
5386
5387 static void addrconf_disable_change(struct net *net, __s32 newf)
5388 {
5389         struct net_device *dev;
5390         struct inet6_dev *idev;
5391
5392         rcu_read_lock();
5393         for_each_netdev_rcu(net, dev) {
5394                 idev = __in6_dev_get(dev);
5395                 if (idev) {
5396                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5397                         idev->cnf.disable_ipv6 = newf;
5398                         if (changed)
5399                                 dev_disable_change(idev);
5400                 }
5401         }
5402         rcu_read_unlock();
5403 }
5404
5405 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5406 {
5407         struct net *net;
5408         int old;
5409
5410         if (!rtnl_trylock())
5411                 return restart_syscall();
5412
5413         net = (struct net *)table->extra2;
5414         old = *p;
5415         *p = newf;
5416
5417         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5418                 rtnl_unlock();
5419                 return 0;
5420         }
5421
5422         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5423                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5424                 addrconf_disable_change(net, newf);
5425         } else if ((!newf) ^ (!old))
5426                 dev_disable_change((struct inet6_dev *)table->extra1);
5427
5428         rtnl_unlock();
5429         return 0;
5430 }
5431
5432 static
5433 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5434                             void __user *buffer, size_t *lenp, loff_t *ppos)
5435 {
5436         int *valp = ctl->data;
5437         int val = *valp;
5438         loff_t pos = *ppos;
5439         struct ctl_table lctl;
5440         int ret;
5441
5442         /*
5443          * ctl->data points to idev->cnf.disable_ipv6, we should
5444          * not modify it until we get the rtnl lock.
5445          */
5446         lctl = *ctl;
5447         lctl.data = &val;
5448
5449         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5450
5451         if (write)
5452                 ret = addrconf_disable_ipv6(ctl, valp, val);
5453         if (ret)
5454                 *ppos = pos;
5455         return ret;
5456 }
5457
5458 static
5459 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5460                               void __user *buffer, size_t *lenp, loff_t *ppos)
5461 {
5462         int *valp = ctl->data;
5463         int ret;
5464         int old, new;
5465
5466         old = *valp;
5467         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5468         new = *valp;
5469
5470         if (write && old != new) {
5471                 struct net *net = ctl->extra2;
5472
5473                 if (!rtnl_trylock())
5474                         return restart_syscall();
5475
5476                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5477                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5478                                                      NETCONFA_IFINDEX_DEFAULT,
5479                                                      net->ipv6.devconf_dflt);
5480                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5481                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5482                                                      NETCONFA_IFINDEX_ALL,
5483                                                      net->ipv6.devconf_all);
5484                 else {
5485                         struct inet6_dev *idev = ctl->extra1;
5486
5487                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5488                                                      idev->dev->ifindex,
5489                                                      &idev->cnf);
5490                 }
5491                 rtnl_unlock();
5492         }
5493
5494         return ret;
5495 }
5496
5497 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5498                                          void __user *buffer, size_t *lenp,
5499                                          loff_t *ppos)
5500 {
5501         int err;
5502         struct in6_addr addr;
5503         char str[IPV6_MAX_STRLEN];
5504         struct ctl_table lctl = *ctl;
5505         struct net *net = ctl->extra2;
5506         struct ipv6_stable_secret *secret = ctl->data;
5507
5508         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5509                 return -EIO;
5510
5511         lctl.maxlen = IPV6_MAX_STRLEN;
5512         lctl.data = str;
5513
5514         if (!rtnl_trylock())
5515                 return restart_syscall();
5516
5517         if (!write && !secret->initialized) {
5518                 err = -EIO;
5519                 goto out;
5520         }
5521
5522         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5523         if (err >= sizeof(str)) {
5524                 err = -EIO;
5525                 goto out;
5526         }
5527
5528         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5529         if (err || !write)
5530                 goto out;
5531
5532         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5533                 err = -EIO;
5534                 goto out;
5535         }
5536
5537         secret->initialized = true;
5538         secret->secret = addr;
5539
5540         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5541                 struct net_device *dev;
5542
5543                 for_each_netdev(net, dev) {
5544                         struct inet6_dev *idev = __in6_dev_get(dev);
5545
5546                         if (idev) {
5547                                 idev->addr_gen_mode =
5548                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5549                         }
5550                 }
5551         } else {
5552                 struct inet6_dev *idev = ctl->extra1;
5553
5554                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5555         }
5556
5557 out:
5558         rtnl_unlock();
5559
5560         return err;
5561 }
5562
5563 static
5564 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5565                                                 int write,
5566                                                 void __user *buffer,
5567                                                 size_t *lenp,
5568                                                 loff_t *ppos)
5569 {
5570         int *valp = ctl->data;
5571         int val = *valp;
5572         loff_t pos = *ppos;
5573         struct ctl_table lctl;
5574         int ret;
5575
5576         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5577          * we should not modify it until we get the rtnl lock.
5578          */
5579         lctl = *ctl;
5580         lctl.data = &val;
5581
5582         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5583
5584         if (write)
5585                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5586         if (ret)
5587                 *ppos = pos;
5588         return ret;
5589 }
5590
5591 static struct addrconf_sysctl_table
5592 {
5593         struct ctl_table_header *sysctl_header;
5594         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5595 } addrconf_sysctl __read_mostly = {
5596         .sysctl_header = NULL,
5597         .addrconf_vars = {
5598                 {
5599                         .procname       = "forwarding",
5600                         .data           = &ipv6_devconf.forwarding,
5601                         .maxlen         = sizeof(int),
5602                         .mode           = 0644,
5603                         .proc_handler   = addrconf_sysctl_forward,
5604                 },
5605                 {
5606                         .procname       = "hop_limit",
5607                         .data           = &ipv6_devconf.hop_limit,
5608                         .maxlen         = sizeof(int),
5609                         .mode           = 0644,
5610                         .proc_handler   = addrconf_sysctl_hop_limit,
5611                 },
5612                 {
5613                         .procname       = "mtu",
5614                         .data           = &ipv6_devconf.mtu6,
5615                         .maxlen         = sizeof(int),
5616                         .mode           = 0644,
5617                         .proc_handler   = addrconf_sysctl_mtu,
5618                 },
5619                 {
5620                         .procname       = "accept_ra",
5621                         .data           = &ipv6_devconf.accept_ra,
5622                         .maxlen         = sizeof(int),
5623                         .mode           = 0644,
5624                         .proc_handler   = proc_dointvec,
5625                 },
5626                 {
5627                         .procname       = "accept_redirects",
5628                         .data           = &ipv6_devconf.accept_redirects,
5629                         .maxlen         = sizeof(int),
5630                         .mode           = 0644,
5631                         .proc_handler   = proc_dointvec,
5632                 },
5633                 {
5634                         .procname       = "autoconf",
5635                         .data           = &ipv6_devconf.autoconf,
5636                         .maxlen         = sizeof(int),
5637                         .mode           = 0644,
5638                         .proc_handler   = proc_dointvec,
5639                 },
5640                 {
5641                         .procname       = "dad_transmits",
5642                         .data           = &ipv6_devconf.dad_transmits,
5643                         .maxlen         = sizeof(int),
5644                         .mode           = 0644,
5645                         .proc_handler   = proc_dointvec,
5646                 },
5647                 {
5648                         .procname       = "router_solicitations",
5649                         .data           = &ipv6_devconf.rtr_solicits,
5650                         .maxlen         = sizeof(int),
5651                         .mode           = 0644,
5652                         .proc_handler   = proc_dointvec,
5653                 },
5654                 {
5655                         .procname       = "router_solicitation_interval",
5656                         .data           = &ipv6_devconf.rtr_solicit_interval,
5657                         .maxlen         = sizeof(int),
5658                         .mode           = 0644,
5659                         .proc_handler   = proc_dointvec_jiffies,
5660                 },
5661                 {
5662                         .procname       = "router_solicitation_delay",
5663                         .data           = &ipv6_devconf.rtr_solicit_delay,
5664                         .maxlen         = sizeof(int),
5665                         .mode           = 0644,
5666                         .proc_handler   = proc_dointvec_jiffies,
5667                 },
5668                 {
5669                         .procname       = "force_mld_version",
5670                         .data           = &ipv6_devconf.force_mld_version,
5671                         .maxlen         = sizeof(int),
5672                         .mode           = 0644,
5673                         .proc_handler   = proc_dointvec,
5674                 },
5675                 {
5676                         .procname       = "mldv1_unsolicited_report_interval",
5677                         .data           =
5678                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
5679                         .maxlen         = sizeof(int),
5680                         .mode           = 0644,
5681                         .proc_handler   = proc_dointvec_ms_jiffies,
5682                 },
5683                 {
5684                         .procname       = "mldv2_unsolicited_report_interval",
5685                         .data           =
5686                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
5687                         .maxlen         = sizeof(int),
5688                         .mode           = 0644,
5689                         .proc_handler   = proc_dointvec_ms_jiffies,
5690                 },
5691                 {
5692                         .procname       = "use_tempaddr",
5693                         .data           = &ipv6_devconf.use_tempaddr,
5694                         .maxlen         = sizeof(int),
5695                         .mode           = 0644,
5696                         .proc_handler   = proc_dointvec,
5697                 },
5698                 {
5699                         .procname       = "temp_valid_lft",
5700                         .data           = &ipv6_devconf.temp_valid_lft,
5701                         .maxlen         = sizeof(int),
5702                         .mode           = 0644,
5703                         .proc_handler   = proc_dointvec,
5704                 },
5705                 {
5706                         .procname       = "temp_prefered_lft",
5707                         .data           = &ipv6_devconf.temp_prefered_lft,
5708                         .maxlen         = sizeof(int),
5709                         .mode           = 0644,
5710                         .proc_handler   = proc_dointvec,
5711                 },
5712                 {
5713                         .procname       = "regen_max_retry",
5714                         .data           = &ipv6_devconf.regen_max_retry,
5715                         .maxlen         = sizeof(int),
5716                         .mode           = 0644,
5717                         .proc_handler   = proc_dointvec,
5718                 },
5719                 {
5720                         .procname       = "max_desync_factor",
5721                         .data           = &ipv6_devconf.max_desync_factor,
5722                         .maxlen         = sizeof(int),
5723                         .mode           = 0644,
5724                         .proc_handler   = proc_dointvec,
5725                 },
5726                 {
5727                         .procname       = "max_addresses",
5728                         .data           = &ipv6_devconf.max_addresses,
5729                         .maxlen         = sizeof(int),
5730                         .mode           = 0644,
5731                         .proc_handler   = proc_dointvec,
5732                 },
5733                 {
5734                         .procname       = "accept_ra_defrtr",
5735                         .data           = &ipv6_devconf.accept_ra_defrtr,
5736                         .maxlen         = sizeof(int),
5737                         .mode           = 0644,
5738                         .proc_handler   = proc_dointvec,
5739                 },
5740                 {
5741                         .procname       = "accept_ra_min_hop_limit",
5742                         .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5743                         .maxlen         = sizeof(int),
5744                         .mode           = 0644,
5745                         .proc_handler   = proc_dointvec,
5746                 },
5747                 {
5748                         .procname       = "accept_ra_pinfo",
5749                         .data           = &ipv6_devconf.accept_ra_pinfo,
5750                         .maxlen         = sizeof(int),
5751                         .mode           = 0644,
5752                         .proc_handler   = proc_dointvec,
5753                 },
5754 #ifdef CONFIG_IPV6_ROUTER_PREF
5755                 {
5756                         .procname       = "accept_ra_rtr_pref",
5757                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
5758                         .maxlen         = sizeof(int),
5759                         .mode           = 0644,
5760                         .proc_handler   = proc_dointvec,
5761                 },
5762                 {
5763                         .procname       = "router_probe_interval",
5764                         .data           = &ipv6_devconf.rtr_probe_interval,
5765                         .maxlen         = sizeof(int),
5766                         .mode           = 0644,
5767                         .proc_handler   = proc_dointvec_jiffies,
5768                 },
5769 #ifdef CONFIG_IPV6_ROUTE_INFO
5770                 {
5771                         .procname       = "accept_ra_rt_info_max_plen",
5772                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5773                         .maxlen         = sizeof(int),
5774                         .mode           = 0644,
5775                         .proc_handler   = proc_dointvec,
5776                 },
5777 #endif
5778 #endif
5779                 {
5780                         .procname       = "proxy_ndp",
5781                         .data           = &ipv6_devconf.proxy_ndp,
5782                         .maxlen         = sizeof(int),
5783                         .mode           = 0644,
5784                         .proc_handler   = addrconf_sysctl_proxy_ndp,
5785                 },
5786                 {
5787                         .procname       = "accept_source_route",
5788                         .data           = &ipv6_devconf.accept_source_route,
5789                         .maxlen         = sizeof(int),
5790                         .mode           = 0644,
5791                         .proc_handler   = proc_dointvec,
5792                 },
5793 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5794                 {
5795                         .procname       = "optimistic_dad",
5796                         .data           = &ipv6_devconf.optimistic_dad,
5797                         .maxlen         = sizeof(int),
5798                         .mode           = 0644,
5799                         .proc_handler   = proc_dointvec,
5800
5801                 },
5802                 {
5803                         .procname       = "use_optimistic",
5804                         .data           = &ipv6_devconf.use_optimistic,
5805                         .maxlen         = sizeof(int),
5806                         .mode           = 0644,
5807                         .proc_handler   = proc_dointvec,
5808
5809                 },
5810 #endif
5811 #ifdef CONFIG_IPV6_MROUTE
5812                 {
5813                         .procname       = "mc_forwarding",
5814                         .data           = &ipv6_devconf.mc_forwarding,
5815                         .maxlen         = sizeof(int),
5816                         .mode           = 0444,
5817                         .proc_handler   = proc_dointvec,
5818                 },
5819 #endif
5820                 {
5821                         .procname       = "disable_ipv6",
5822                         .data           = &ipv6_devconf.disable_ipv6,
5823                         .maxlen         = sizeof(int),
5824                         .mode           = 0644,
5825                         .proc_handler   = addrconf_sysctl_disable,
5826                 },
5827                 {
5828                         .procname       = "accept_dad",
5829                         .data           = &ipv6_devconf.accept_dad,
5830                         .maxlen         = sizeof(int),
5831                         .mode           = 0644,
5832                         .proc_handler   = proc_dointvec,
5833                 },
5834                 {
5835                         .procname       = "force_tllao",
5836                         .data           = &ipv6_devconf.force_tllao,
5837                         .maxlen         = sizeof(int),
5838                         .mode           = 0644,
5839                         .proc_handler   = proc_dointvec
5840                 },
5841                 {
5842                         .procname       = "ndisc_notify",
5843                         .data           = &ipv6_devconf.ndisc_notify,
5844                         .maxlen         = sizeof(int),
5845                         .mode           = 0644,
5846                         .proc_handler   = proc_dointvec
5847                 },
5848                 {
5849                         .procname       = "suppress_frag_ndisc",
5850                         .data           = &ipv6_devconf.suppress_frag_ndisc,
5851                         .maxlen         = sizeof(int),
5852                         .mode           = 0644,
5853                         .proc_handler   = proc_dointvec
5854                 },
5855                 {
5856                         .procname       = "accept_ra_from_local",
5857                         .data           = &ipv6_devconf.accept_ra_from_local,
5858                         .maxlen         = sizeof(int),
5859                         .mode           = 0644,
5860                         .proc_handler   = proc_dointvec,
5861                 },
5862                 {
5863                         .procname       = "accept_ra_mtu",
5864                         .data           = &ipv6_devconf.accept_ra_mtu,
5865                         .maxlen         = sizeof(int),
5866                         .mode           = 0644,
5867                         .proc_handler   = proc_dointvec,
5868                 },
5869                 {
5870                         .procname       = "stable_secret",
5871                         .data           = &ipv6_devconf.stable_secret,
5872                         .maxlen         = IPV6_MAX_STRLEN,
5873                         .mode           = 0600,
5874                         .proc_handler   = addrconf_sysctl_stable_secret,
5875                 },
5876                 {
5877                         .procname       = "use_oif_addrs_only",
5878                         .data           = &ipv6_devconf.use_oif_addrs_only,
5879                         .maxlen         = sizeof(int),
5880                         .mode           = 0644,
5881                         .proc_handler   = proc_dointvec,
5882                 },
5883                 {
5884                         .procname       = "ignore_routes_with_linkdown",
5885                         .data           = &ipv6_devconf.ignore_routes_with_linkdown,
5886                         .maxlen         = sizeof(int),
5887                         .mode           = 0644,
5888                         .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
5889                 },
5890                 {
5891                         .procname       = "drop_unicast_in_l2_multicast",
5892                         .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
5893                         .maxlen         = sizeof(int),
5894                         .mode           = 0644,
5895                         .proc_handler   = proc_dointvec,
5896                 },
5897                 {
5898                         .procname       = "drop_unsolicited_na",
5899                         .data           = &ipv6_devconf.drop_unsolicited_na,
5900                         .maxlen         = sizeof(int),
5901                         .mode           = 0644,
5902                         .proc_handler   = proc_dointvec,
5903                 },
5904                 {
5905                         .procname       = "keep_addr_on_down",
5906                         .data           = &ipv6_devconf.keep_addr_on_down,
5907                         .maxlen         = sizeof(int),
5908                         .mode           = 0644,
5909                         .proc_handler   = proc_dointvec,
5910
5911                 },
5912                 {
5913                         /* sentinel */
5914                 }
5915         },
5916 };
5917
5918 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5919                 struct inet6_dev *idev, struct ipv6_devconf *p)
5920 {
5921         int i;
5922         struct addrconf_sysctl_table *t;
5923         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5924
5925         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5926         if (!t)
5927                 goto out;
5928
5929         for (i = 0; t->addrconf_vars[i].data; i++) {
5930                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5931                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5932                 t->addrconf_vars[i].extra2 = net;
5933         }
5934
5935         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5936
5937         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5938         if (!t->sysctl_header)
5939                 goto free;
5940
5941         p->sysctl = t;
5942         return 0;
5943
5944 free:
5945         kfree(t);
5946 out:
5947         return -ENOBUFS;
5948 }
5949
5950 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5951 {
5952         struct addrconf_sysctl_table *t;
5953
5954         if (!p->sysctl)
5955                 return;
5956
5957         t = p->sysctl;
5958         p->sysctl = NULL;
5959         unregister_net_sysctl_table(t->sysctl_header);
5960         kfree(t);
5961 }
5962
5963 static int addrconf_sysctl_register(struct inet6_dev *idev)
5964 {
5965         int err;
5966
5967         if (!sysctl_dev_name_is_allowed(idev->dev->name))
5968                 return -EINVAL;
5969
5970         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5971                                     &ndisc_ifinfo_sysctl_change);
5972         if (err)
5973                 return err;
5974         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5975                                          idev, &idev->cnf);
5976         if (err)
5977                 neigh_sysctl_unregister(idev->nd_parms);
5978
5979         return err;
5980 }
5981
5982 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5983 {
5984         __addrconf_sysctl_unregister(&idev->cnf);
5985         neigh_sysctl_unregister(idev->nd_parms);
5986 }
5987
5988
5989 #endif
5990
5991 static int __net_init addrconf_init_net(struct net *net)
5992 {
5993         int err = -ENOMEM;
5994         struct ipv6_devconf *all, *dflt;
5995
5996         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5997         if (!all)
5998                 goto err_alloc_all;
5999
6000         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6001         if (!dflt)
6002                 goto err_alloc_dflt;
6003
6004         /* these will be inherited by all namespaces */
6005         dflt->autoconf = ipv6_defaults.autoconf;
6006         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6007
6008         dflt->stable_secret.initialized = false;
6009         all->stable_secret.initialized = false;
6010
6011         net->ipv6.devconf_all = all;
6012         net->ipv6.devconf_dflt = dflt;
6013
6014 #ifdef CONFIG_SYSCTL
6015         err = __addrconf_sysctl_register(net, "all", NULL, all);
6016         if (err < 0)
6017                 goto err_reg_all;
6018
6019         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6020         if (err < 0)
6021                 goto err_reg_dflt;
6022 #endif
6023         return 0;
6024
6025 #ifdef CONFIG_SYSCTL
6026 err_reg_dflt:
6027         __addrconf_sysctl_unregister(all);
6028 err_reg_all:
6029         kfree(dflt);
6030 #endif
6031 err_alloc_dflt:
6032         kfree(all);
6033 err_alloc_all:
6034         return err;
6035 }
6036
6037 static void __net_exit addrconf_exit_net(struct net *net)
6038 {
6039 #ifdef CONFIG_SYSCTL
6040         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6041         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6042 #endif
6043         kfree(net->ipv6.devconf_dflt);
6044         kfree(net->ipv6.devconf_all);
6045 }
6046
6047 static struct pernet_operations addrconf_ops = {
6048         .init = addrconf_init_net,
6049         .exit = addrconf_exit_net,
6050 };
6051
6052 static struct rtnl_af_ops inet6_ops __read_mostly = {
6053         .family           = AF_INET6,
6054         .fill_link_af     = inet6_fill_link_af,
6055         .get_link_af_size = inet6_get_link_af_size,
6056         .validate_link_af = inet6_validate_link_af,
6057         .set_link_af      = inet6_set_link_af,
6058 };
6059
6060 /*
6061  *      Init / cleanup code
6062  */
6063
6064 int __init addrconf_init(void)
6065 {
6066         struct inet6_dev *idev;
6067         int i, err;
6068
6069         err = ipv6_addr_label_init();
6070         if (err < 0) {
6071                 pr_crit("%s: cannot initialize default policy table: %d\n",
6072                         __func__, err);
6073                 goto out;
6074         }
6075
6076         err = register_pernet_subsys(&addrconf_ops);
6077         if (err < 0)
6078                 goto out_addrlabel;
6079
6080         addrconf_wq = create_workqueue("ipv6_addrconf");
6081         if (!addrconf_wq) {
6082                 err = -ENOMEM;
6083                 goto out_nowq;
6084         }
6085
6086         /* The addrconf netdev notifier requires that loopback_dev
6087          * has it's ipv6 private information allocated and setup
6088          * before it can bring up and give link-local addresses
6089          * to other devices which are up.
6090          *
6091          * Unfortunately, loopback_dev is not necessarily the first
6092          * entry in the global dev_base list of net devices.  In fact,
6093          * it is likely to be the very last entry on that list.
6094          * So this causes the notifier registry below to try and
6095          * give link-local addresses to all devices besides loopback_dev
6096          * first, then loopback_dev, which cases all the non-loopback_dev
6097          * devices to fail to get a link-local address.
6098          *
6099          * So, as a temporary fix, allocate the ipv6 structure for
6100          * loopback_dev first by hand.
6101          * Longer term, all of the dependencies ipv6 has upon the loopback
6102          * device and it being up should be removed.
6103          */
6104         rtnl_lock();
6105         idev = ipv6_add_dev(init_net.loopback_dev);
6106         rtnl_unlock();
6107         if (IS_ERR(idev)) {
6108                 err = PTR_ERR(idev);
6109                 goto errlo;
6110         }
6111
6112         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6113                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6114
6115         register_netdevice_notifier(&ipv6_dev_notf);
6116
6117         addrconf_verify();
6118
6119         rtnl_af_register(&inet6_ops);
6120
6121         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6122                               NULL);
6123         if (err < 0)
6124                 goto errout;
6125
6126         /* Only the first call to __rtnl_register can fail */
6127         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6128         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6129         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6130                         inet6_dump_ifaddr, NULL);
6131         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6132                         inet6_dump_ifmcaddr, NULL);
6133         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6134                         inet6_dump_ifacaddr, NULL);
6135         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6136                         inet6_netconf_dump_devconf, NULL);
6137
6138         ipv6_addr_label_rtnl_register();
6139
6140         return 0;
6141 errout:
6142         rtnl_af_unregister(&inet6_ops);
6143         unregister_netdevice_notifier(&ipv6_dev_notf);
6144 errlo:
6145         destroy_workqueue(addrconf_wq);
6146 out_nowq:
6147         unregister_pernet_subsys(&addrconf_ops);
6148 out_addrlabel:
6149         ipv6_addr_label_cleanup();
6150 out:
6151         return err;
6152 }
6153
6154 void addrconf_cleanup(void)
6155 {
6156         struct net_device *dev;
6157         int i;
6158
6159         unregister_netdevice_notifier(&ipv6_dev_notf);
6160         unregister_pernet_subsys(&addrconf_ops);
6161         ipv6_addr_label_cleanup();
6162
6163         rtnl_lock();
6164
6165         __rtnl_af_unregister(&inet6_ops);
6166
6167         /* clean dev list */
6168         for_each_netdev(&init_net, dev) {
6169                 if (__in6_dev_get(dev) == NULL)
6170                         continue;
6171                 addrconf_ifdown(dev, 1);
6172         }
6173         addrconf_ifdown(init_net.loopback_dev, 2);
6174
6175         /*
6176          *      Check hash table.
6177          */
6178         spin_lock_bh(&addrconf_hash_lock);
6179         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6180                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6181         spin_unlock_bh(&addrconf_hash_lock);
6182         cancel_delayed_work(&addr_chk_work);
6183         rtnl_unlock();
6184
6185         destroy_workqueue(addrconf_wq);
6186 }