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