net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #define pr_fmt(fmt) "IPv6: " fmt
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/kernel.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/net.h>
  49 #include <linux/inet.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_addr.h>
  53 #include <linux/if_arp.h>
  54 #include <linux/if_arcnet.h>
  55 #include <linux/if_infiniband.h>
  56 #include <linux/route.h>
  57 #include <linux/inetdevice.h>
  58 #include <linux/init.h>
  59 #include <linux/slab.h>
  60 #ifdef CONFIG_SYSCTL
  61 #include <linux/sysctl.h>
  62 #endif
  63 #include <linux/capability.h>
  64 #include <linux/delay.h>
  65 #include <linux/notifier.h>
  66 #include <linux/string.h>
  67 #include <linux/hash.h>
  68
  69 #include <net/net_namespace.h>
  70 #include <net/sock.h>
  71 #include <net/snmp.h>
  72
  73 #include <net/6lowpan.h>
  74 #include <net/firewire.h>
  75 #include <net/ipv6.h>
  76 #include <net/protocol.h>
  77 #include <net/ndisc.h>
  78 #include <net/ip6_route.h>
  79 #include <net/addrconf.h>
  80 #include <net/tcp.h>
  81 #include <net/ip.h>
  82 #include <net/netlink.h>
  83 #include <net/pkt_sched.h>
  84 #include <net/l3mdev.h>
  85 #include <linux/if_tunnel.h>
  86 #include <linux/rtnetlink.h>
  87 #include <linux/netconf.h>
  88 #include <linux/random.h>
  89 #include <linux/uaccess.h>
  90 #include <asm/unaligned.h>
  91
  92 #include <linux/proc_fs.h>
  93 #include <linux/seq_file.h>
  94 #include <linux/export.h>
  95
  96 /* Set to 3 to get tracing... */
  97 #define ACONF_DEBUG 2
  98
  99 #if ACONF_DEBUG >= 3
 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
 101 #else
 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 103 #endif
 104
 105 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 106
 107 #define IPV6_MAX_STRLEN \
 108         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
 109
 110 static inline u32 cstamp_delta(unsigned long cstamp)
 111 {
 112         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 113 }
 114
 115 #ifdef CONFIG_SYSCTL
 116 static int addrconf_sysctl_register(struct inet6_dev *idev);
 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 118 #else
 119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 120 {
 121         return 0;
 122 }
 123
 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 125 {
 126 }
 127 #endif
 128
 129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 131 static void ipv6_regen_rndid(unsigned long data);
 132
 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 134 static int ipv6_count_addresses(struct inet6_dev *idev);
 135 static int ipv6_generate_stable_address(struct in6_addr *addr,
 136                                         u8 dad_count,
 137                                         const struct inet6_dev *idev);
 138
 139 /*
 140  *      Configured unicast address hash table
 141  */
 142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 143 static DEFINE_SPINLOCK(addrconf_hash_lock);
 144
 145 static void addrconf_verify(void);
 146 static void addrconf_verify_rtnl(void);
 147 static void addrconf_verify_work(struct work_struct *);
 148
 149 static struct workqueue_struct *addrconf_wq;
 150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 151
 152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 154
 155 static void addrconf_type_change(struct net_device *dev,
 156                                  unsigned long event);
 157 static int addrconf_ifdown(struct net_device *dev, int how);
 158
 159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 160                                                   int plen,
 161                                                   const struct net_device *dev,
 162                                                   u32 flags, u32 noflags);
 163
 164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 165 static void addrconf_dad_work(struct work_struct *w);
 166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 167 static void addrconf_dad_run(struct inet6_dev *idev);
 168 static void addrconf_rs_timer(unsigned long data);
 169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 171
 172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 173                                 struct prefix_info *pinfo);
 174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 175                                struct net_device *dev);
 176
 177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 178         .forwarding             = 0,
 179         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 180         .mtu6                   = IPV6_MIN_MTU,
 181         .accept_ra              = 1,
 182         .accept_redirects       = 1,
 183         .autoconf               = 1,
 184         .force_mld_version      = 0,
 185         .mldv1_unsolicited_report_interval = 10 * HZ,
 186         .mldv2_unsolicited_report_interval = HZ,
 187         .dad_transmits          = 1,
 188         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 189         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 190         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 191         .use_tempaddr           = 0,
 192         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 193         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 194         .regen_max_retry        = REGEN_MAX_RETRY,
 195         .max_desync_factor      = MAX_DESYNC_FACTOR,
 196         .max_addresses          = IPV6_MAX_ADDRESSES,
 197         .accept_ra_defrtr       = 1,
 198         .accept_ra_from_local   = 0,
 199         .accept_ra_min_hop_limit= 1,
 200         .accept_ra_pinfo        = 1,
 201 #ifdef CONFIG_IPV6_ROUTER_PREF
 202         .accept_ra_rtr_pref     = 1,
 203         .rtr_probe_interval     = 60 * HZ,
 204 #ifdef CONFIG_IPV6_ROUTE_INFO
 205         .accept_ra_rt_info_max_plen = 0,
 206 #endif
 207 #endif
 208         .proxy_ndp              = 0,
 209         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 210         .disable_ipv6           = 0,
 211         .accept_dad             = 1,
 212         .suppress_frag_ndisc    = 1,
 213         .accept_ra_mtu          = 1,
 214         .stable_secret          = {
 215                 .initialized = false,
 216         },
 217         .use_oif_addrs_only     = 0,
 218         .ignore_routes_with_linkdown = 0,
 219         .keep_addr_on_down      = 0,
 220 };
 221
 222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 223         .forwarding             = 0,
 224         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 225         .mtu6                   = IPV6_MIN_MTU,
 226         .accept_ra              = 1,
 227         .accept_redirects       = 1,
 228         .autoconf               = 1,
 229         .force_mld_version      = 0,
 230         .mldv1_unsolicited_report_interval = 10 * HZ,
 231         .mldv2_unsolicited_report_interval = HZ,
 232         .dad_transmits          = 1,
 233         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 234         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 235         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 236         .use_tempaddr           = 0,
 237         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 238         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 239         .regen_max_retry        = REGEN_MAX_RETRY,
 240         .max_desync_factor      = MAX_DESYNC_FACTOR,
 241         .max_addresses          = IPV6_MAX_ADDRESSES,
 242         .accept_ra_defrtr       = 1,
 243         .accept_ra_from_local   = 0,
 244         .accept_ra_min_hop_limit= 1,
 245         .accept_ra_pinfo        = 1,
 246 #ifdef CONFIG_IPV6_ROUTER_PREF
 247         .accept_ra_rtr_pref     = 1,
 248         .rtr_probe_interval     = 60 * HZ,
 249 #ifdef CONFIG_IPV6_ROUTE_INFO
 250         .accept_ra_rt_info_max_plen = 0,
 251 #endif
 252 #endif
 253         .proxy_ndp              = 0,
 254         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 255         .disable_ipv6           = 0,
 256         .accept_dad             = 1,
 257         .suppress_frag_ndisc    = 1,
 258         .accept_ra_mtu          = 1,
 259         .stable_secret          = {
 260                 .initialized = false,
 261         },
 262         .use_oif_addrs_only     = 0,
 263         .ignore_routes_with_linkdown = 0,
 264         .keep_addr_on_down      = 0,
 265 };
 266
 267 /* Check if a valid qdisc is available */
 268 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 269 {
 270         return !qdisc_tx_is_noop(dev);
 271 }
 272
 273 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 274 {
 275         if (del_timer(&idev->rs_timer))
 276                 __in6_dev_put(idev);
 277 }
 278
 279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 280 {
 281         if (cancel_delayed_work(&ifp->dad_work))
 282                 __in6_ifa_put(ifp);
 283 }
 284
 285 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 286                                   unsigned long when)
 287 {
 288         if (!timer_pending(&idev->rs_timer))
 289                 in6_dev_hold(idev);
 290         mod_timer(&idev->rs_timer, jiffies + when);
 291 }
 292
 293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 294                                    unsigned long delay)
 295 {
 296         if (!delayed_work_pending(&ifp->dad_work))
 297                 in6_ifa_hold(ifp);
 298         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 299 }
 300
 301 static int snmp6_alloc_dev(struct inet6_dev *idev)
 302 {
 303         int i;
 304
 305         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 306         if (!idev->stats.ipv6)
 307                 goto err_ip;
 308
 309         for_each_possible_cpu(i) {
 310                 struct ipstats_mib *addrconf_stats;
 311                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 312                 u64_stats_init(&addrconf_stats->syncp);
 313         }
 314
 315
 316         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 317                                         GFP_KERNEL);
 318         if (!idev->stats.icmpv6dev)
 319                 goto err_icmp;
 320         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 321                                            GFP_KERNEL);
 322         if (!idev->stats.icmpv6msgdev)
 323                 goto err_icmpmsg;
 324
 325         return 0;
 326
 327 err_icmpmsg:
 328         kfree(idev->stats.icmpv6dev);
 329 err_icmp:
 330         free_percpu(idev->stats.ipv6);
 331 err_ip:
 332         return -ENOMEM;
 333 }
 334
 335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 336 {
 337         struct inet6_dev *ndev;
 338         int err = -ENOMEM;
 339
 340         ASSERT_RTNL();
 341
 342         if (dev->mtu < IPV6_MIN_MTU)
 343                 return ERR_PTR(-EINVAL);
 344
 345         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 346         if (!ndev)
 347                 return ERR_PTR(err);
 348
 349         rwlock_init(&ndev->lock);
 350         ndev->dev = dev;
 351         INIT_LIST_HEAD(&ndev->addr_list);
 352         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 353                     (unsigned long)ndev);
 354         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 355
 356         if (ndev->cnf.stable_secret.initialized)
 357                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 358         else
 359                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
 360
 361         ndev->cnf.mtu6 = dev->mtu;
 362         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 363         if (!ndev->nd_parms) {
 364                 kfree(ndev);
 365                 return ERR_PTR(err);
 366         }
 367         if (ndev->cnf.forwarding)
 368                 dev_disable_lro(dev);
 369         /* We refer to the device */
 370         dev_hold(dev);
 371
 372         if (snmp6_alloc_dev(ndev) < 0) {
 373                 ADBG(KERN_WARNING
 374                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 375                         __func__, dev->name);
 376                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 377                 dev_put(dev);
 378                 kfree(ndev);
 379                 return ERR_PTR(err);
 380         }
 381
 382         if (snmp6_register_dev(ndev) < 0) {
 383                 ADBG(KERN_WARNING
 384                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 385                         __func__, dev->name);
 386                 goto err_release;
 387         }
 388
 389         /* One reference from device.  We must do this before
 390          * we invoke __ipv6_regen_rndid().
 391          */
 392         in6_dev_hold(ndev);
 393
 394         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 395                 ndev->cnf.accept_dad = -1;
 396
 397 #if IS_ENABLED(CONFIG_IPV6_SIT)
 398         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 399                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 400                 ndev->cnf.rtr_solicits = 0;
 401         }
 402 #endif
 403
 404         INIT_LIST_HEAD(&ndev->tempaddr_list);
 405         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 406         if ((dev->flags&IFF_LOOPBACK) ||
 407             dev->type == ARPHRD_TUNNEL ||
 408             dev->type == ARPHRD_TUNNEL6 ||
 409             dev->type == ARPHRD_SIT ||
 410             dev->type == ARPHRD_NONE) {
 411                 ndev->cnf.use_tempaddr = -1;
 412         } else {
 413                 in6_dev_hold(ndev);
 414                 ipv6_regen_rndid((unsigned long) ndev);
 415         }
 416
 417         ndev->token = in6addr_any;
 418
 419         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 420                 ndev->if_flags |= IF_READY;
 421
 422         ipv6_mc_init_dev(ndev);
 423         ndev->tstamp = jiffies;
 424         err = addrconf_sysctl_register(ndev);
 425         if (err) {
 426                 ipv6_mc_destroy_dev(ndev);
 427                 del_timer(&ndev->regen_timer);
 428                 snmp6_unregister_dev(ndev);
 429                 goto err_release;
 430         }
 431         /* protected by rtnl_lock */
 432         rcu_assign_pointer(dev->ip6_ptr, ndev);
 433
 434         /* Join interface-local all-node multicast group */
 435         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 436
 437         /* Join all-node multicast group */
 438         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 439
 440         /* Join all-router multicast group if forwarding is set */
 441         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 442                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 443
 444         return ndev;
 445
 446 err_release:
 447         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 448         ndev->dead = 1;
 449         in6_dev_finish_destroy(ndev);
 450         return ERR_PTR(err);
 451 }
 452
 453 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 454 {
 455         struct inet6_dev *idev;
 456
 457         ASSERT_RTNL();
 458
 459         idev = __in6_dev_get(dev);
 460         if (!idev) {
 461                 idev = ipv6_add_dev(dev);
 462                 if (IS_ERR(idev))
 463                         return NULL;
 464         }
 465
 466         if (dev->flags&IFF_UP)
 467                 ipv6_mc_up(idev);
 468         return idev;
 469 }
 470
 471 static int inet6_netconf_msgsize_devconf(int type)
 472 {
 473         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 474                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 475         bool all = false;
 476
 477         if (type == NETCONFA_ALL)
 478                 all = true;
 479
 480         if (all || type == NETCONFA_FORWARDING)
 481                 size += nla_total_size(4);
 482 #ifdef CONFIG_IPV6_MROUTE
 483         if (all || type == NETCONFA_MC_FORWARDING)
 484                 size += nla_total_size(4);
 485 #endif
 486         if (all || type == NETCONFA_PROXY_NEIGH)
 487                 size += nla_total_size(4);
 488
 489         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 490                 size += nla_total_size(4);
 491
 492         return size;
 493 }
 494
 495 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 496                                       struct ipv6_devconf *devconf, u32 portid,
 497                                       u32 seq, int event, unsigned int flags,
 498                                       int type)
 499 {
 500         struct nlmsghdr  *nlh;
 501         struct netconfmsg *ncm;
 502         bool all = false;
 503
 504         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 505                         flags);
 506         if (!nlh)
 507                 return -EMSGSIZE;
 508
 509         if (type == NETCONFA_ALL)
 510                 all = true;
 511
 512         ncm = nlmsg_data(nlh);
 513         ncm->ncm_family = AF_INET6;
 514
 515         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 516                 goto nla_put_failure;
 517
 518         if ((all || type == NETCONFA_FORWARDING) &&
 519             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 520                 goto nla_put_failure;
 521 #ifdef CONFIG_IPV6_MROUTE
 522         if ((all || type == NETCONFA_MC_FORWARDING) &&
 523             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 524                         devconf->mc_forwarding) < 0)
 525                 goto nla_put_failure;
 526 #endif
 527         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 528             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 529                 goto nla_put_failure;
 530
 531         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 532             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 533                         devconf->ignore_routes_with_linkdown) < 0)
 534                 goto nla_put_failure;
 535
 536         nlmsg_end(skb, nlh);
 537         return 0;
 538
 539 nla_put_failure:
 540         nlmsg_cancel(skb, nlh);
 541         return -EMSGSIZE;
 542 }
 543
 544 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 545                                   struct ipv6_devconf *devconf)
 546 {
 547         struct sk_buff *skb;
 548         int err = -ENOBUFS;
 549
 550         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 551         if (!skb)
 552                 goto errout;
 553
 554         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 555                                          RTM_NEWNETCONF, 0, type);
 556         if (err < 0) {
 557                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 558                 WARN_ON(err == -EMSGSIZE);
 559                 kfree_skb(skb);
 560                 goto errout;
 561         }
 562         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 563         return;
 564 errout:
 565         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 566 }
 567
 568 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 569         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 570         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 571         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 572         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 573 };
 574
 575 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 576                                      struct nlmsghdr *nlh)
 577 {
 578         struct net *net = sock_net(in_skb->sk);
 579         struct nlattr *tb[NETCONFA_MAX+1];
 580         struct netconfmsg *ncm;
 581         struct sk_buff *skb;
 582         struct ipv6_devconf *devconf;
 583         struct inet6_dev *in6_dev;
 584         struct net_device *dev;
 585         int ifindex;
 586         int err;
 587
 588         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 589                           devconf_ipv6_policy);
 590         if (err < 0)
 591                 goto errout;
 592
 593         err = -EINVAL;
 594         if (!tb[NETCONFA_IFINDEX])
 595                 goto errout;
 596
 597         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 598         switch (ifindex) {
 599         case NETCONFA_IFINDEX_ALL:
 600                 devconf = net->ipv6.devconf_all;
 601                 break;
 602         case NETCONFA_IFINDEX_DEFAULT:
 603                 devconf = net->ipv6.devconf_dflt;
 604                 break;
 605         default:
 606                 dev = __dev_get_by_index(net, ifindex);
 607                 if (!dev)
 608                         goto errout;
 609                 in6_dev = __in6_dev_get(dev);
 610                 if (!in6_dev)
 611                         goto errout;
 612                 devconf = &in6_dev->cnf;
 613                 break;
 614         }
 615
 616         err = -ENOBUFS;
 617         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
 618         if (!skb)
 619                 goto errout;
 620
 621         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 622                                          NETLINK_CB(in_skb).portid,
 623                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 624                                          NETCONFA_ALL);
 625         if (err < 0) {
 626                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 627                 WARN_ON(err == -EMSGSIZE);
 628                 kfree_skb(skb);
 629                 goto errout;
 630         }
 631         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 632 errout:
 633         return err;
 634 }
 635
 636 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 637                                       struct netlink_callback *cb)
 638 {
 639         struct net *net = sock_net(skb->sk);
 640         int h, s_h;
 641         int idx, s_idx;
 642         struct net_device *dev;
 643         struct inet6_dev *idev;
 644         struct hlist_head *head;
 645
 646         s_h = cb->args[0];
 647         s_idx = idx = cb->args[1];
 648
 649         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 650                 idx = 0;
 651                 head = &net->dev_index_head[h];
 652                 rcu_read_lock();
 653                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 654                           net->dev_base_seq;
 655                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 656                         if (idx < s_idx)
 657                                 goto cont;
 658                         idev = __in6_dev_get(dev);
 659                         if (!idev)
 660                                 goto cont;
 661
 662                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 663                                                        &idev->cnf,
 664                                                        NETLINK_CB(cb->skb).portid,
 665                                                        cb->nlh->nlmsg_seq,
 666                                                        RTM_NEWNETCONF,
 667                                                        NLM_F_MULTI,
 668                                                        NETCONFA_ALL) < 0) {
 669                                 rcu_read_unlock();
 670                                 goto done;
 671                         }
 672                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 673 cont:
 674                         idx++;
 675                 }
 676                 rcu_read_unlock();
 677         }
 678         if (h == NETDEV_HASHENTRIES) {
 679                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 680                                                net->ipv6.devconf_all,
 681                                                NETLINK_CB(cb->skb).portid,
 682                                                cb->nlh->nlmsg_seq,
 683                                                RTM_NEWNETCONF, NLM_F_MULTI,
 684                                                NETCONFA_ALL) < 0)
 685                         goto done;
 686                 else
 687                         h++;
 688         }
 689         if (h == NETDEV_HASHENTRIES + 1) {
 690                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 691                                                net->ipv6.devconf_dflt,
 692                                                NETLINK_CB(cb->skb).portid,
 693                                                cb->nlh->nlmsg_seq,
 694                                                RTM_NEWNETCONF, NLM_F_MULTI,
 695                                                NETCONFA_ALL) < 0)
 696                         goto done;
 697                 else
 698                         h++;
 699         }
 700 done:
 701         cb->args[0] = h;
 702         cb->args[1] = idx;
 703
 704         return skb->len;
 705 }
 706
 707 #ifdef CONFIG_SYSCTL
 708 static void dev_forward_change(struct inet6_dev *idev)
 709 {
 710         struct net_device *dev;
 711         struct inet6_ifaddr *ifa;
 712
 713         if (!idev)
 714                 return;
 715         dev = idev->dev;
 716         if (idev->cnf.forwarding)
 717                 dev_disable_lro(dev);
 718         if (dev->flags & IFF_MULTICAST) {
 719                 if (idev->cnf.forwarding) {
 720                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 721                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 722                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 723                 } else {
 724                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 725                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 726                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 727                 }
 728         }
 729
 730         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 731                 if (ifa->flags&IFA_F_TENTATIVE)
 732                         continue;
 733                 if (idev->cnf.forwarding)
 734                         addrconf_join_anycast(ifa);
 735                 else
 736                         addrconf_leave_anycast(ifa);
 737         }
 738         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 739                                      dev->ifindex, &idev->cnf);
 740 }
 741
 742
 743 static void addrconf_forward_change(struct net *net, __s32 newf)
 744 {
 745         struct net_device *dev;
 746         struct inet6_dev *idev;
 747
 748         for_each_netdev(net, dev) {
 749                 idev = __in6_dev_get(dev);
 750                 if (idev) {
 751                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 752                         idev->cnf.forwarding = newf;
 753                         if (changed)
 754                                 dev_forward_change(idev);
 755                 }
 756         }
 757 }
 758
 759 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 760 {
 761         struct net *net;
 762         int old;
 763
 764         if (!rtnl_trylock())
 765                 return restart_syscall();
 766
 767         net = (struct net *)table->extra2;
 768         old = *p;
 769         *p = newf;
 770
 771         if (p == &net->ipv6.devconf_dflt->forwarding) {
 772                 if ((!newf) ^ (!old))
 773                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 774                                                      NETCONFA_IFINDEX_DEFAULT,
 775                                                      net->ipv6.devconf_dflt);
 776                 rtnl_unlock();
 777                 return 0;
 778         }
 779
 780         if (p == &net->ipv6.devconf_all->forwarding) {
 781                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 782
 783                 net->ipv6.devconf_dflt->forwarding = newf;
 784                 if ((!newf) ^ (!old_dflt))
 785                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 786                                                      NETCONFA_IFINDEX_DEFAULT,
 787                                                      net->ipv6.devconf_dflt);
 788
 789                 addrconf_forward_change(net, newf);
 790                 if ((!newf) ^ (!old))
 791                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 792                                                      NETCONFA_IFINDEX_ALL,
 793                                                      net->ipv6.devconf_all);
 794         } else if ((!newf) ^ (!old))
 795                 dev_forward_change((struct inet6_dev *)table->extra1);
 796         rtnl_unlock();
 797
 798         if (newf)
 799                 rt6_purge_dflt_routers(net);
 800         return 1;
 801 }
 802
 803 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 804 {
 805         struct net_device *dev;
 806         struct inet6_dev *idev;
 807
 808         for_each_netdev(net, dev) {
 809                 idev = __in6_dev_get(dev);
 810                 if (idev) {
 811                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 812
 813                         idev->cnf.ignore_routes_with_linkdown = newf;
 814                         if (changed)
 815                                 inet6_netconf_notify_devconf(dev_net(dev),
 816                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 817                                                              dev->ifindex,
 818                                                              &idev->cnf);
 819                 }
 820         }
 821 }
 822
 823 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 824 {
 825         struct net *net;
 826         int old;
 827
 828         if (!rtnl_trylock())
 829                 return restart_syscall();
 830
 831         net = (struct net *)table->extra2;
 832         old = *p;
 833         *p = newf;
 834
 835         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 836                 if ((!newf) ^ (!old))
 837                         inet6_netconf_notify_devconf(net,
 838                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 839                                                      NETCONFA_IFINDEX_DEFAULT,
 840                                                      net->ipv6.devconf_dflt);
 841                 rtnl_unlock();
 842                 return 0;
 843         }
 844
 845         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 846                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 847                 addrconf_linkdown_change(net, newf);
 848                 if ((!newf) ^ (!old))
 849                         inet6_netconf_notify_devconf(net,
 850                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 851                                                      NETCONFA_IFINDEX_ALL,
 852                                                      net->ipv6.devconf_all);
 853         }
 854         rtnl_unlock();
 855
 856         return 1;
 857 }
 858
 859 #endif
 860
 861 /* Nobody refers to this ifaddr, destroy it */
 862 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 863 {
 864         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 865
 866 #ifdef NET_REFCNT_DEBUG
 867         pr_debug("%s\n", __func__);
 868 #endif
 869
 870         in6_dev_put(ifp->idev);
 871
 872         if (cancel_delayed_work(&ifp->dad_work))
 873                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 874                           ifp);
 875
 876         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 877                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 878                 return;
 879         }
 880         ip6_rt_put(ifp->rt);
 881
 882         kfree_rcu(ifp, rcu);
 883 }
 884
 885 static void
 886 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 887 {
 888         struct list_head *p;
 889         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 890
 891         /*
 892          * Each device address list is sorted in order of scope -
 893          * global before linklocal.
 894          */
 895         list_for_each(p, &idev->addr_list) {
 896                 struct inet6_ifaddr *ifa
 897                         = list_entry(p, struct inet6_ifaddr, if_list);
 898                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 899                         break;
 900         }
 901
 902         list_add_tail(&ifp->if_list, p);
 903 }
 904
 905 static u32 inet6_addr_hash(const struct in6_addr *addr)
 906 {
 907         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 908 }
 909
 910 /* On success it returns ifp with increased reference count */
 911
 912 static struct inet6_ifaddr *
 913 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 914               const struct in6_addr *peer_addr, int pfxlen,
 915               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 916 {
 917         struct inet6_ifaddr *ifa = NULL;
 918         struct rt6_info *rt;
 919         unsigned int hash;
 920         int err = 0;
 921         int addr_type = ipv6_addr_type(addr);
 922
 923         if (addr_type == IPV6_ADDR_ANY ||
 924             addr_type & IPV6_ADDR_MULTICAST ||
 925             (!(idev->dev->flags & IFF_LOOPBACK) &&
 926              addr_type & IPV6_ADDR_LOOPBACK))
 927                 return ERR_PTR(-EADDRNOTAVAIL);
 928
 929         rcu_read_lock_bh();
 930         if (idev->dead) {
 931                 err = -ENODEV;                  /*XXX*/
 932                 goto out2;
 933         }
 934
 935         if (idev->cnf.disable_ipv6) {
 936                 err = -EACCES;
 937                 goto out2;
 938         }
 939
 940         spin_lock(&addrconf_hash_lock);
 941
 942         /* Ignore adding duplicate addresses on an interface */
 943         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 944                 ADBG("ipv6_add_addr: already assigned\n");
 945                 err = -EEXIST;
 946                 goto out;
 947         }
 948
 949         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 950
 951         if (!ifa) {
 952                 ADBG("ipv6_add_addr: malloc failed\n");
 953                 err = -ENOBUFS;
 954                 goto out;
 955         }
 956
 957         rt = addrconf_dst_alloc(idev, addr, false);
 958         if (IS_ERR(rt)) {
 959                 err = PTR_ERR(rt);
 960                 goto out;
 961         }
 962
 963         neigh_parms_data_state_setall(idev->nd_parms);
 964
 965         ifa->addr = *addr;
 966         if (peer_addr)
 967                 ifa->peer_addr = *peer_addr;
 968
 969         spin_lock_init(&ifa->lock);
 970         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 971         INIT_HLIST_NODE(&ifa->addr_lst);
 972         ifa->scope = scope;
 973         ifa->prefix_len = pfxlen;
 974         ifa->flags = flags | IFA_F_TENTATIVE;
 975         ifa->valid_lft = valid_lft;
 976         ifa->prefered_lft = prefered_lft;
 977         ifa->cstamp = ifa->tstamp = jiffies;
 978         ifa->tokenized = false;
 979
 980         ifa->rt = rt;
 981
 982         ifa->idev = idev;
 983         in6_dev_hold(idev);
 984         /* For caller */
 985         in6_ifa_hold(ifa);
 986
 987         /* Add to big hash table */
 988         hash = inet6_addr_hash(addr);
 989
 990         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 991         spin_unlock(&addrconf_hash_lock);
 992
 993         write_lock(&idev->lock);
 994         /* Add to inet6_dev unicast addr list. */
 995         ipv6_link_dev_addr(idev, ifa);
 996
 997         if (ifa->flags&IFA_F_TEMPORARY) {
 998                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 999                 in6_ifa_hold(ifa);
1000         }
1001
1002         in6_ifa_hold(ifa);
1003         write_unlock(&idev->lock);
1004 out2:
1005         rcu_read_unlock_bh();
1006
1007         if (likely(err == 0))
1008                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1009         else {
1010                 kfree(ifa);
1011                 ifa = ERR_PTR(err);
1012         }
1013
1014         return ifa;
1015 out:
1016         spin_unlock(&addrconf_hash_lock);
1017         goto out2;
1018 }
1019
1020 enum cleanup_prefix_rt_t {
1021         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1022         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1023         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1024 };
1025
1026 /*
1027  * Check, whether the prefix for ifp would still need a prefix route
1028  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1029  * constants.
1030  *
1031  * 1) we don't purge prefix if address was not permanent.
1032  *    prefix is managed by its own lifetime.
1033  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1034  * 3) if there are no addresses, delete prefix.
1035  * 4) if there are still other permanent address(es),
1036  *    corresponding prefix is still permanent.
1037  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1038  *    don't purge the prefix, assume user space is managing it.
1039  * 6) otherwise, update prefix lifetime to the
1040  *    longest valid lifetime among the corresponding
1041  *    addresses on the device.
1042  *    Note: subsequent RA will update lifetime.
1043  **/
1044 static enum cleanup_prefix_rt_t
1045 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1046 {
1047         struct inet6_ifaddr *ifa;
1048         struct inet6_dev *idev = ifp->idev;
1049         unsigned long lifetime;
1050         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1051
1052         *expires = jiffies;
1053
1054         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1055                 if (ifa == ifp)
1056                         continue;
1057                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1058                                        ifp->prefix_len))
1059                         continue;
1060                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1061                         return CLEANUP_PREFIX_RT_NOP;
1062
1063                 action = CLEANUP_PREFIX_RT_EXPIRE;
1064
1065                 spin_lock(&ifa->lock);
1066
1067                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1068                 /*
1069                  * Note: Because this address is
1070                  * not permanent, lifetime <
1071                  * LONG_MAX / HZ here.
1072                  */
1073                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1074                         *expires = ifa->tstamp + lifetime * HZ;
1075                 spin_unlock(&ifa->lock);
1076         }
1077
1078         return action;
1079 }
1080
1081 static void
1082 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1083 {
1084         struct rt6_info *rt;
1085
1086         rt = addrconf_get_prefix_route(&ifp->addr,
1087                                        ifp->prefix_len,
1088                                        ifp->idev->dev,
1089                                        0, RTF_GATEWAY | RTF_DEFAULT);
1090         if (rt) {
1091                 if (del_rt)
1092                         ip6_del_rt(rt);
1093                 else {
1094                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1095                                 rt6_set_expires(rt, expires);
1096                         ip6_rt_put(rt);
1097                 }
1098         }
1099 }
1100
1101
1102 /* This function wants to get referenced ifp and releases it before return */
1103
1104 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1105 {
1106         int state;
1107         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1108         unsigned long expires;
1109
1110         ASSERT_RTNL();
1111
1112         spin_lock_bh(&ifp->lock);
1113         state = ifp->state;
1114         ifp->state = INET6_IFADDR_STATE_DEAD;
1115         spin_unlock_bh(&ifp->lock);
1116
1117         if (state == INET6_IFADDR_STATE_DEAD)
1118                 goto out;
1119
1120         spin_lock_bh(&addrconf_hash_lock);
1121         hlist_del_init_rcu(&ifp->addr_lst);
1122         spin_unlock_bh(&addrconf_hash_lock);
1123
1124         write_lock_bh(&ifp->idev->lock);
1125
1126         if (ifp->flags&IFA_F_TEMPORARY) {
1127                 list_del(&ifp->tmp_list);
1128                 if (ifp->ifpub) {
1129                         in6_ifa_put(ifp->ifpub);
1130                         ifp->ifpub = NULL;
1131                 }
1132                 __in6_ifa_put(ifp);
1133         }
1134
1135         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1136                 action = check_cleanup_prefix_route(ifp, &expires);
1137
1138         list_del_init(&ifp->if_list);
1139         __in6_ifa_put(ifp);
1140
1141         write_unlock_bh(&ifp->idev->lock);
1142
1143         addrconf_del_dad_work(ifp);
1144
1145         ipv6_ifa_notify(RTM_DELADDR, ifp);
1146
1147         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1148
1149         if (action != CLEANUP_PREFIX_RT_NOP) {
1150                 cleanup_prefix_route(ifp, expires,
1151                         action == CLEANUP_PREFIX_RT_DEL);
1152         }
1153
1154         /* clean up prefsrc entries */
1155         rt6_remove_prefsrc(ifp);
1156 out:
1157         in6_ifa_put(ifp);
1158 }
1159
1160 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1161 {
1162         struct inet6_dev *idev = ifp->idev;
1163         struct in6_addr addr, *tmpaddr;
1164         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1165         unsigned long regen_advance;
1166         int tmp_plen;
1167         int ret = 0;
1168         u32 addr_flags;
1169         unsigned long now = jiffies;
1170
1171         write_lock_bh(&idev->lock);
1172         if (ift) {
1173                 spin_lock_bh(&ift->lock);
1174                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1175                 spin_unlock_bh(&ift->lock);
1176                 tmpaddr = &addr;
1177         } else {
1178                 tmpaddr = NULL;
1179         }
1180 retry:
1181         in6_dev_hold(idev);
1182         if (idev->cnf.use_tempaddr <= 0) {
1183                 write_unlock_bh(&idev->lock);
1184                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1185                 in6_dev_put(idev);
1186                 ret = -1;
1187                 goto out;
1188         }
1189         spin_lock_bh(&ifp->lock);
1190         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1191                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1192                 spin_unlock_bh(&ifp->lock);
1193                 write_unlock_bh(&idev->lock);
1194                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1195                         __func__);
1196                 in6_dev_put(idev);
1197                 ret = -1;
1198                 goto out;
1199         }
1200         in6_ifa_hold(ifp);
1201         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1202         __ipv6_try_regen_rndid(idev, tmpaddr);
1203         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1204         age = (now - ifp->tstamp) / HZ;
1205         tmp_valid_lft = min_t(__u32,
1206                               ifp->valid_lft,
1207                               idev->cnf.temp_valid_lft + age);
1208         tmp_prefered_lft = min_t(__u32,
1209                                  ifp->prefered_lft,
1210                                  idev->cnf.temp_prefered_lft + age -
1211                                  idev->cnf.max_desync_factor);
1212         tmp_plen = ifp->prefix_len;
1213         tmp_tstamp = ifp->tstamp;
1214         spin_unlock_bh(&ifp->lock);
1215
1216         regen_advance = idev->cnf.regen_max_retry *
1217                         idev->cnf.dad_transmits *
1218                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1219         write_unlock_bh(&idev->lock);
1220
1221         /* A temporary address is created only if this calculated Preferred
1222          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1223          * an implementation must not create a temporary address with a zero
1224          * Preferred Lifetime.
1225          * Use age calculation as in addrconf_verify to avoid unnecessary
1226          * temporary addresses being generated.
1227          */
1228         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1229         if (tmp_prefered_lft <= regen_advance + age) {
1230                 in6_ifa_put(ifp);
1231                 in6_dev_put(idev);
1232                 ret = -1;
1233                 goto out;
1234         }
1235
1236         addr_flags = IFA_F_TEMPORARY;
1237         /* set in addrconf_prefix_rcv() */
1238         if (ifp->flags & IFA_F_OPTIMISTIC)
1239                 addr_flags |= IFA_F_OPTIMISTIC;
1240
1241         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1242                             ipv6_addr_scope(&addr), addr_flags,
1243                             tmp_valid_lft, tmp_prefered_lft);
1244         if (IS_ERR(ift)) {
1245                 in6_ifa_put(ifp);
1246                 in6_dev_put(idev);
1247                 pr_info("%s: retry temporary address regeneration\n", __func__);
1248                 tmpaddr = &addr;
1249                 write_lock_bh(&idev->lock);
1250                 goto retry;
1251         }
1252
1253         spin_lock_bh(&ift->lock);
1254         ift->ifpub = ifp;
1255         ift->cstamp = now;
1256         ift->tstamp = tmp_tstamp;
1257         spin_unlock_bh(&ift->lock);
1258
1259         addrconf_dad_start(ift);
1260         in6_ifa_put(ift);
1261         in6_dev_put(idev);
1262 out:
1263         return ret;
1264 }
1265
1266 /*
1267  *      Choose an appropriate source address (RFC3484)
1268  */
1269 enum {
1270         IPV6_SADDR_RULE_INIT = 0,
1271         IPV6_SADDR_RULE_LOCAL,
1272         IPV6_SADDR_RULE_SCOPE,
1273         IPV6_SADDR_RULE_PREFERRED,
1274 #ifdef CONFIG_IPV6_MIP6
1275         IPV6_SADDR_RULE_HOA,
1276 #endif
1277         IPV6_SADDR_RULE_OIF,
1278         IPV6_SADDR_RULE_LABEL,
1279         IPV6_SADDR_RULE_PRIVACY,
1280         IPV6_SADDR_RULE_ORCHID,
1281         IPV6_SADDR_RULE_PREFIX,
1282 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1283         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1284 #endif
1285         IPV6_SADDR_RULE_MAX
1286 };
1287
1288 struct ipv6_saddr_score {
1289         int                     rule;
1290         int                     addr_type;
1291         struct inet6_ifaddr     *ifa;
1292         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1293         int                     scopedist;
1294         int                     matchlen;
1295 };
1296
1297 struct ipv6_saddr_dst {
1298         const struct in6_addr *addr;
1299         int ifindex;
1300         int scope;
1301         int label;
1302         unsigned int prefs;
1303 };
1304
1305 static inline int ipv6_saddr_preferred(int type)
1306 {
1307         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1308                 return 1;
1309         return 0;
1310 }
1311
1312 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1313 {
1314 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1315         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1316 #else
1317         return false;
1318 #endif
1319 }
1320
1321 static int ipv6_get_saddr_eval(struct net *net,
1322                                struct ipv6_saddr_score *score,
1323                                struct ipv6_saddr_dst *dst,
1324                                int i)
1325 {
1326         int ret;
1327
1328         if (i <= score->rule) {
1329                 switch (i) {
1330                 case IPV6_SADDR_RULE_SCOPE:
1331                         ret = score->scopedist;
1332                         break;
1333                 case IPV6_SADDR_RULE_PREFIX:
1334                         ret = score->matchlen;
1335                         break;
1336                 default:
1337                         ret = !!test_bit(i, score->scorebits);
1338                 }
1339                 goto out;
1340         }
1341
1342         switch (i) {
1343         case IPV6_SADDR_RULE_INIT:
1344                 /* Rule 0: remember if hiscore is not ready yet */
1345                 ret = !!score->ifa;
1346                 break;
1347         case IPV6_SADDR_RULE_LOCAL:
1348                 /* Rule 1: Prefer same address */
1349                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1350                 break;
1351         case IPV6_SADDR_RULE_SCOPE:
1352                 /* Rule 2: Prefer appropriate scope
1353                  *
1354                  *      ret
1355                  *       ^
1356                  *    -1 |  d 15
1357                  *    ---+--+-+---> scope
1358                  *       |
1359                  *       |             d is scope of the destination.
1360                  *  B-d  |  \
1361                  *       |   \      <- smaller scope is better if
1362                  *  B-15 |    \        if scope is enough for destination.
1363                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1364                  * d-C-1 | /
1365                  *       |/         <- greater is better
1366                  *   -C  /             if scope is not enough for destination.
1367                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1368                  *
1369                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1370                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1371                  * Assume B = 0 and we get C > 29.
1372                  */
1373                 ret = __ipv6_addr_src_scope(score->addr_type);
1374                 if (ret >= dst->scope)
1375                         ret = -ret;
1376                 else
1377                         ret -= 128;     /* 30 is enough */
1378                 score->scopedist = ret;
1379                 break;
1380         case IPV6_SADDR_RULE_PREFERRED:
1381             {
1382                 /* Rule 3: Avoid deprecated and optimistic addresses */
1383                 u8 avoid = IFA_F_DEPRECATED;
1384
1385                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1386                         avoid |= IFA_F_OPTIMISTIC;
1387                 ret = ipv6_saddr_preferred(score->addr_type) ||
1388                       !(score->ifa->flags & avoid);
1389                 break;
1390             }
1391 #ifdef CONFIG_IPV6_MIP6
1392         case IPV6_SADDR_RULE_HOA:
1393             {
1394                 /* Rule 4: Prefer home address */
1395                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1396                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1397                 break;
1398             }
1399 #endif
1400         case IPV6_SADDR_RULE_OIF:
1401                 /* Rule 5: Prefer outgoing interface */
1402                 ret = (!dst->ifindex ||
1403                        dst->ifindex == score->ifa->idev->dev->ifindex);
1404                 break;
1405         case IPV6_SADDR_RULE_LABEL:
1406                 /* Rule 6: Prefer matching label */
1407                 ret = ipv6_addr_label(net,
1408                                       &score->ifa->addr, score->addr_type,
1409                                       score->ifa->idev->dev->ifindex) == dst->label;
1410                 break;
1411         case IPV6_SADDR_RULE_PRIVACY:
1412             {
1413                 /* Rule 7: Prefer public address
1414                  * Note: prefer temporary address if use_tempaddr >= 2
1415                  */
1416                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1417                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1418                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1419                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1420                 break;
1421             }
1422         case IPV6_SADDR_RULE_ORCHID:
1423                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1424                  *          non-ORCHID vs non-ORCHID
1425                  */
1426                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1427                         ipv6_addr_orchid(dst->addr));
1428                 break;
1429         case IPV6_SADDR_RULE_PREFIX:
1430                 /* Rule 8: Use longest matching prefix */
1431                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1432                 if (ret > score->ifa->prefix_len)
1433                         ret = score->ifa->prefix_len;
1434                 score->matchlen = ret;
1435                 break;
1436 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1437         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1438                 /* Optimistic addresses still have lower precedence than other
1439                  * preferred addresses.
1440                  */
1441                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1442                 break;
1443 #endif
1444         default:
1445                 ret = 0;
1446         }
1447
1448         if (ret)
1449                 __set_bit(i, score->scorebits);
1450         score->rule = i;
1451 out:
1452         return ret;
1453 }
1454
1455 static int __ipv6_dev_get_saddr(struct net *net,
1456                                 struct ipv6_saddr_dst *dst,
1457                                 struct inet6_dev *idev,
1458                                 struct ipv6_saddr_score *scores,
1459                                 int hiscore_idx)
1460 {
1461         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1462
1463         read_lock_bh(&idev->lock);
1464         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1465                 int i;
1466
1467                 /*
1468                  * - Tentative Address (RFC2462 section 5.4)
1469                  *  - A tentative address is not considered
1470                  *    "assigned to an interface" in the traditional
1471                  *    sense, unless it is also flagged as optimistic.
1472                  * - Candidate Source Address (section 4)
1473                  *  - In any case, anycast addresses, multicast
1474                  *    addresses, and the unspecified address MUST
1475                  *    NOT be included in a candidate set.
1476                  */
1477                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1478                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1479                         continue;
1480
1481                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1482
1483                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1484                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1485                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1486                                             idev->dev->name);
1487                         continue;
1488                 }
1489
1490                 score->rule = -1;
1491                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1492
1493                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1494                         int minihiscore, miniscore;
1495
1496                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1497                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1498
1499                         if (minihiscore > miniscore) {
1500                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1501                                     score->scopedist > 0) {
1502                                         /*
1503                                          * special case:
1504                                          * each remaining entry
1505                                          * has too small (not enough)
1506                                          * scope, because ifa entries
1507                                          * are sorted by their scope
1508                                          * values.
1509                                          */
1510                                         goto out;
1511                                 }
1512                                 break;
1513                         } else if (minihiscore < miniscore) {
1514                                 if (hiscore->ifa)
1515                                         in6_ifa_put(hiscore->ifa);
1516
1517                                 in6_ifa_hold(score->ifa);
1518
1519                                 swap(hiscore, score);
1520                                 hiscore_idx = 1 - hiscore_idx;
1521
1522                                 /* restore our iterator */
1523                                 score->ifa = hiscore->ifa;
1524
1525                                 break;
1526                         }
1527                 }
1528         }
1529 out:
1530         read_unlock_bh(&idev->lock);
1531         return hiscore_idx;
1532 }
1533
1534 static int ipv6_get_saddr_master(struct net *net,
1535                                  const struct net_device *dst_dev,
1536                                  const struct net_device *master,
1537                                  struct ipv6_saddr_dst *dst,
1538                                  struct ipv6_saddr_score *scores,
1539                                  int hiscore_idx)
1540 {
1541         struct inet6_dev *idev;
1542
1543         idev = __in6_dev_get(dst_dev);
1544         if (idev)
1545                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1546                                                    scores, hiscore_idx);
1547
1548         idev = __in6_dev_get(master);
1549         if (idev)
1550                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1551                                                    scores, hiscore_idx);
1552
1553         return hiscore_idx;
1554 }
1555
1556 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1557                        const struct in6_addr *daddr, unsigned int prefs,
1558                        struct in6_addr *saddr)
1559 {
1560         struct ipv6_saddr_score scores[2], *hiscore;
1561         struct ipv6_saddr_dst dst;
1562         struct inet6_dev *idev;
1563         struct net_device *dev;
1564         int dst_type;
1565         bool use_oif_addr = false;
1566         int hiscore_idx = 0;
1567
1568         dst_type = __ipv6_addr_type(daddr);
1569         dst.addr = daddr;
1570         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1571         dst.scope = __ipv6_addr_src_scope(dst_type);
1572         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1573         dst.prefs = prefs;
1574
1575         scores[hiscore_idx].rule = -1;
1576         scores[hiscore_idx].ifa = NULL;
1577
1578         rcu_read_lock();
1579
1580         /* Candidate Source Address (section 4)
1581          *  - multicast and link-local destination address,
1582          *    the set of candidate source address MUST only
1583          *    include addresses assigned to interfaces
1584          *    belonging to the same link as the outgoing
1585          *    interface.
1586          * (- For site-local destination addresses, the
1587          *    set of candidate source addresses MUST only
1588          *    include addresses assigned to interfaces
1589          *    belonging to the same site as the outgoing
1590          *    interface.)
1591          *  - "It is RECOMMENDED that the candidate source addresses
1592          *    be the set of unicast addresses assigned to the
1593          *    interface that will be used to send to the destination
1594          *    (the 'outgoing' interface)." (RFC 6724)
1595          */
1596         if (dst_dev) {
1597                 idev = __in6_dev_get(dst_dev);
1598                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1599                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1600                     (idev && idev->cnf.use_oif_addrs_only)) {
1601                         use_oif_addr = true;
1602                 }
1603         }
1604
1605         if (use_oif_addr) {
1606                 if (idev)
1607                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1608         } else {
1609                 const struct net_device *master;
1610                 int master_idx = 0;
1611
1612                 /* if dst_dev exists and is enslaved to an L3 device, then
1613                  * prefer addresses from dst_dev and then the master over
1614                  * any other enslaved devices in the L3 domain.
1615                  */
1616                 master = l3mdev_master_dev_rcu(dst_dev);
1617                 if (master) {
1618                         master_idx = master->ifindex;
1619
1620                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1621                                                             master, &dst,
1622                                                             scores, hiscore_idx);
1623
1624                         if (scores[hiscore_idx].ifa)
1625                                 goto out;
1626                 }
1627
1628                 for_each_netdev_rcu(net, dev) {
1629                         /* only consider addresses on devices in the
1630                          * same L3 domain
1631                          */
1632                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1633                                 continue;
1634                         idev = __in6_dev_get(dev);
1635                         if (!idev)
1636                                 continue;
1637                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1638                 }
1639         }
1640
1641 out:
1642         rcu_read_unlock();
1643
1644         hiscore = &scores[hiscore_idx];
1645         if (!hiscore->ifa)
1646                 return -EADDRNOTAVAIL;
1647
1648         *saddr = hiscore->ifa->addr;
1649         in6_ifa_put(hiscore->ifa);
1650         return 0;
1651 }
1652 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1653
1654 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1655                       u32 banned_flags)
1656 {
1657         struct inet6_ifaddr *ifp;
1658         int err = -EADDRNOTAVAIL;
1659
1660         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1661                 if (ifp->scope > IFA_LINK)
1662                         break;
1663                 if (ifp->scope == IFA_LINK &&
1664                     !(ifp->flags & banned_flags)) {
1665                         *addr = ifp->addr;
1666                         err = 0;
1667                         break;
1668                 }
1669         }
1670         return err;
1671 }
1672
1673 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1674                     u32 banned_flags)
1675 {
1676         struct inet6_dev *idev;
1677         int err = -EADDRNOTAVAIL;
1678
1679         rcu_read_lock();
1680         idev = __in6_dev_get(dev);
1681         if (idev) {
1682                 read_lock_bh(&idev->lock);
1683                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1684                 read_unlock_bh(&idev->lock);
1685         }
1686         rcu_read_unlock();
1687         return err;
1688 }
1689
1690 static int ipv6_count_addresses(struct inet6_dev *idev)
1691 {
1692         int cnt = 0;
1693         struct inet6_ifaddr *ifp;
1694
1695         read_lock_bh(&idev->lock);
1696         list_for_each_entry(ifp, &idev->addr_list, if_list)
1697                 cnt++;
1698         read_unlock_bh(&idev->lock);
1699         return cnt;
1700 }
1701
1702 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1703                   const struct net_device *dev, int strict)
1704 {
1705         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1706 }
1707 EXPORT_SYMBOL(ipv6_chk_addr);
1708
1709 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1710                             const struct net_device *dev, int strict,
1711                             u32 banned_flags)
1712 {
1713         struct inet6_ifaddr *ifp;
1714         unsigned int hash = inet6_addr_hash(addr);
1715         u32 ifp_flags;
1716
1717         rcu_read_lock_bh();
1718         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1719                 if (!net_eq(dev_net(ifp->idev->dev), net))
1720                         continue;
1721                 /* Decouple optimistic from tentative for evaluation here.
1722                  * Ban optimistic addresses explicitly, when required.
1723                  */
1724                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1725                             ? (ifp->flags&~IFA_F_TENTATIVE)
1726                             : ifp->flags;
1727                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1728                     !(ifp_flags&banned_flags) &&
1729                     (!dev || ifp->idev->dev == dev ||
1730                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1731                         rcu_read_unlock_bh();
1732                         return 1;
1733                 }
1734         }
1735
1736         rcu_read_unlock_bh();
1737         return 0;
1738 }
1739 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1740
1741 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1742                                struct net_device *dev)
1743 {
1744         unsigned int hash = inet6_addr_hash(addr);
1745         struct inet6_ifaddr *ifp;
1746
1747         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1748                 if (!net_eq(dev_net(ifp->idev->dev), net))
1749                         continue;
1750                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1751                         if (!dev || ifp->idev->dev == dev)
1752                                 return true;
1753                 }
1754         }
1755         return false;
1756 }
1757
1758 /* Compares an address/prefix_len with addresses on device @dev.
1759  * If one is found it returns true.
1760  */
1761 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1762         const unsigned int prefix_len, struct net_device *dev)
1763 {
1764         struct inet6_dev *idev;
1765         struct inet6_ifaddr *ifa;
1766         bool ret = false;
1767
1768         rcu_read_lock();
1769         idev = __in6_dev_get(dev);
1770         if (idev) {
1771                 read_lock_bh(&idev->lock);
1772                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1773                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1774                         if (ret)
1775                                 break;
1776                 }
1777                 read_unlock_bh(&idev->lock);
1778         }
1779         rcu_read_unlock();
1780
1781         return ret;
1782 }
1783 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1784
1785 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1786 {
1787         struct inet6_dev *idev;
1788         struct inet6_ifaddr *ifa;
1789         int     onlink;
1790
1791         onlink = 0;
1792         rcu_read_lock();
1793         idev = __in6_dev_get(dev);
1794         if (idev) {
1795                 read_lock_bh(&idev->lock);
1796                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1797                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1798                                                    ifa->prefix_len);
1799                         if (onlink)
1800                                 break;
1801                 }
1802                 read_unlock_bh(&idev->lock);
1803         }
1804         rcu_read_unlock();
1805         return onlink;
1806 }
1807 EXPORT_SYMBOL(ipv6_chk_prefix);
1808
1809 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1810                                      struct net_device *dev, int strict)
1811 {
1812         struct inet6_ifaddr *ifp, *result = NULL;
1813         unsigned int hash = inet6_addr_hash(addr);
1814
1815         rcu_read_lock_bh();
1816         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1817                 if (!net_eq(dev_net(ifp->idev->dev), net))
1818                         continue;
1819                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1820                         if (!dev || ifp->idev->dev == dev ||
1821                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1822                                 result = ifp;
1823                                 in6_ifa_hold(ifp);
1824                                 break;
1825                         }
1826                 }
1827         }
1828         rcu_read_unlock_bh();
1829
1830         return result;
1831 }
1832
1833 /* Gets referenced address, destroys ifaddr */
1834
1835 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1836 {
1837         if (dad_failed)
1838                 ifp->flags |= IFA_F_DADFAILED;
1839
1840         if (ifp->flags&IFA_F_PERMANENT) {
1841                 spin_lock_bh(&ifp->lock);
1842                 addrconf_del_dad_work(ifp);
1843                 ifp->flags |= IFA_F_TENTATIVE;
1844                 spin_unlock_bh(&ifp->lock);
1845                 if (dad_failed)
1846                         ipv6_ifa_notify(0, ifp);
1847                 in6_ifa_put(ifp);
1848         } else if (ifp->flags&IFA_F_TEMPORARY) {
1849                 struct inet6_ifaddr *ifpub;
1850                 spin_lock_bh(&ifp->lock);
1851                 ifpub = ifp->ifpub;
1852                 if (ifpub) {
1853                         in6_ifa_hold(ifpub);
1854                         spin_unlock_bh(&ifp->lock);
1855                         ipv6_create_tempaddr(ifpub, ifp);
1856                         in6_ifa_put(ifpub);
1857                 } else {
1858                         spin_unlock_bh(&ifp->lock);
1859                 }
1860                 ipv6_del_addr(ifp);
1861         } else {
1862                 ipv6_del_addr(ifp);
1863         }
1864 }
1865
1866 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1867 {
1868         int err = -ENOENT;
1869
1870         spin_lock_bh(&ifp->lock);
1871         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1872                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1873                 err = 0;
1874         }
1875         spin_unlock_bh(&ifp->lock);
1876
1877         return err;
1878 }
1879
1880 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1881 {
1882         struct inet6_dev *idev = ifp->idev;
1883         struct net *net = dev_net(ifp->idev->dev);
1884
1885         if (addrconf_dad_end(ifp)) {
1886                 in6_ifa_put(ifp);
1887                 return;
1888         }
1889
1890         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1891                              ifp->idev->dev->name, &ifp->addr);
1892
1893         spin_lock_bh(&ifp->lock);
1894
1895         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1896                 int scope = ifp->scope;
1897                 u32 flags = ifp->flags;
1898                 struct in6_addr new_addr;
1899                 struct inet6_ifaddr *ifp2;
1900                 u32 valid_lft, preferred_lft;
1901                 int pfxlen = ifp->prefix_len;
1902                 int retries = ifp->stable_privacy_retry + 1;
1903
1904                 if (retries > net->ipv6.sysctl.idgen_retries) {
1905                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1906                                              ifp->idev->dev->name);
1907                         goto errdad;
1908                 }
1909
1910                 new_addr = ifp->addr;
1911                 if (ipv6_generate_stable_address(&new_addr, retries,
1912                                                  idev))
1913                         goto errdad;
1914
1915                 valid_lft = ifp->valid_lft;
1916                 preferred_lft = ifp->prefered_lft;
1917
1918                 spin_unlock_bh(&ifp->lock);
1919
1920                 if (idev->cnf.max_addresses &&
1921                     ipv6_count_addresses(idev) >=
1922                     idev->cnf.max_addresses)
1923                         goto lock_errdad;
1924
1925                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1926                                      ifp->idev->dev->name);
1927
1928                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1929                                      scope, flags, valid_lft,
1930                                      preferred_lft);
1931                 if (IS_ERR(ifp2))
1932                         goto lock_errdad;
1933
1934                 spin_lock_bh(&ifp2->lock);
1935                 ifp2->stable_privacy_retry = retries;
1936                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1937                 spin_unlock_bh(&ifp2->lock);
1938
1939                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1940                 in6_ifa_put(ifp2);
1941 lock_errdad:
1942                 spin_lock_bh(&ifp->lock);
1943         }
1944
1945 errdad:
1946         /* transition from _POSTDAD to _ERRDAD */
1947         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1948         spin_unlock_bh(&ifp->lock);
1949
1950         addrconf_mod_dad_work(ifp, 0);
1951         in6_ifa_put(ifp);
1952 }
1953
1954 /* Join to solicited addr multicast group.
1955  * caller must hold RTNL */
1956 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1957 {
1958         struct in6_addr maddr;
1959
1960         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1961                 return;
1962
1963         addrconf_addr_solict_mult(addr, &maddr);
1964         ipv6_dev_mc_inc(dev, &maddr);
1965 }
1966
1967 /* caller must hold RTNL */
1968 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1969 {
1970         struct in6_addr maddr;
1971
1972         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1973                 return;
1974
1975         addrconf_addr_solict_mult(addr, &maddr);
1976         __ipv6_dev_mc_dec(idev, &maddr);
1977 }
1978
1979 /* caller must hold RTNL */
1980 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1981 {
1982         struct in6_addr addr;
1983
1984         if (ifp->prefix_len >= 127) /* RFC 6164 */
1985                 return;
1986         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1987         if (ipv6_addr_any(&addr))
1988                 return;
1989         __ipv6_dev_ac_inc(ifp->idev, &addr);
1990 }
1991
1992 /* caller must hold RTNL */
1993 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1994 {
1995         struct in6_addr addr;
1996
1997         if (ifp->prefix_len >= 127) /* RFC 6164 */
1998                 return;
1999         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2000         if (ipv6_addr_any(&addr))
2001                 return;
2002         __ipv6_dev_ac_dec(ifp->idev, &addr);
2003 }
2004
2005 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2006 {
2007         if (dev->addr_len != EUI64_ADDR_LEN)
2008                 return -1;
2009         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2010         eui[0] ^= 2;
2011         return 0;
2012 }
2013
2014 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2015 {
2016         union fwnet_hwaddr *ha;
2017
2018         if (dev->addr_len != FWNET_ALEN)
2019                 return -1;
2020
2021         ha = (union fwnet_hwaddr *)dev->dev_addr;
2022
2023         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2024         eui[0] ^= 2;
2025         return 0;
2026 }
2027
2028 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2029 {
2030         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2031         if (dev->addr_len != ARCNET_ALEN)
2032                 return -1;
2033         memset(eui, 0, 7);
2034         eui[7] = *(u8 *)dev->dev_addr;
2035         return 0;
2036 }
2037
2038 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2039 {
2040         if (dev->addr_len != INFINIBAND_ALEN)
2041                 return -1;
2042         memcpy(eui, dev->dev_addr + 12, 8);
2043         eui[0] |= 2;
2044         return 0;
2045 }
2046
2047 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2048 {
2049         if (addr == 0)
2050                 return -1;
2051         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2052                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2053                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2054                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2055                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2056                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2057         eui[1] = 0;
2058         eui[2] = 0x5E;
2059         eui[3] = 0xFE;
2060         memcpy(eui + 4, &addr, 4);
2061         return 0;
2062 }
2063
2064 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2065 {
2066         if (dev->priv_flags & IFF_ISATAP)
2067                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2068         return -1;
2069 }
2070
2071 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2072 {
2073         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2074 }
2075
2076 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2077 {
2078         memcpy(eui, dev->perm_addr, 3);
2079         memcpy(eui + 5, dev->perm_addr + 3, 3);
2080         eui[3] = 0xFF;
2081         eui[4] = 0xFE;
2082         eui[0] ^= 2;
2083         return 0;
2084 }
2085
2086 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2087 {
2088         switch (dev->type) {
2089         case ARPHRD_ETHER:
2090         case ARPHRD_FDDI:
2091                 return addrconf_ifid_eui48(eui, dev);
2092         case ARPHRD_ARCNET:
2093                 return addrconf_ifid_arcnet(eui, dev);
2094         case ARPHRD_INFINIBAND:
2095                 return addrconf_ifid_infiniband(eui, dev);
2096         case ARPHRD_SIT:
2097                 return addrconf_ifid_sit(eui, dev);
2098         case ARPHRD_IPGRE:
2099                 return addrconf_ifid_gre(eui, dev);
2100         case ARPHRD_6LOWPAN:
2101                 return addrconf_ifid_eui64(eui, dev);
2102         case ARPHRD_IEEE1394:
2103                 return addrconf_ifid_ieee1394(eui, dev);
2104         case ARPHRD_TUNNEL6:
2105                 return addrconf_ifid_ip6tnl(eui, dev);
2106         }
2107         return -1;
2108 }
2109
2110 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2111 {
2112         int err = -1;
2113         struct inet6_ifaddr *ifp;
2114
2115         read_lock_bh(&idev->lock);
2116         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2117                 if (ifp->scope > IFA_LINK)
2118                         break;
2119                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2120                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2121                         err = 0;
2122                         break;
2123                 }
2124         }
2125         read_unlock_bh(&idev->lock);
2126         return err;
2127 }
2128
2129 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2130 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2131 {
2132 regen:
2133         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2134         idev->rndid[0] &= ~0x02;
2135
2136         /*
2137          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2138          * check if generated address is not inappropriate
2139          *
2140          *  - Reserved subnet anycast (RFC 2526)
2141          *      11111101 11....11 1xxxxxxx
2142          *  - ISATAP (RFC4214) 6.1
2143          *      00-00-5E-FE-xx-xx-xx-xx
2144          *  - value 0
2145          *  - XXX: already assigned to an address on the device
2146          */
2147         if (idev->rndid[0] == 0xfd &&
2148             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2149             (idev->rndid[7]&0x80))
2150                 goto regen;
2151         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2152                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2153                         goto regen;
2154                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2155                         goto regen;
2156         }
2157 }
2158
2159 static void ipv6_regen_rndid(unsigned long data)
2160 {
2161         struct inet6_dev *idev = (struct inet6_dev *) data;
2162         unsigned long expires;
2163
2164         rcu_read_lock_bh();
2165         write_lock_bh(&idev->lock);
2166
2167         if (idev->dead)
2168                 goto out;
2169
2170         __ipv6_regen_rndid(idev);
2171
2172         expires = jiffies +
2173                 idev->cnf.temp_prefered_lft * HZ -
2174                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2175                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2176                 idev->cnf.max_desync_factor * HZ;
2177         if (time_before(expires, jiffies)) {
2178                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2179                         __func__, idev->dev->name);
2180                 goto out;
2181         }
2182
2183         if (!mod_timer(&idev->regen_timer, expires))
2184                 in6_dev_hold(idev);
2185
2186 out:
2187         write_unlock_bh(&idev->lock);
2188         rcu_read_unlock_bh();
2189         in6_dev_put(idev);
2190 }
2191
2192 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2193 {
2194         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2195                 __ipv6_regen_rndid(idev);
2196 }
2197
2198 /*
2199  *      Add prefix route.
2200  */
2201
2202 static void
2203 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2204                       unsigned long expires, u32 flags)
2205 {
2206         struct fib6_config cfg = {
2207                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2208                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2209                 .fc_ifindex = dev->ifindex,
2210                 .fc_expires = expires,
2211                 .fc_dst_len = plen,
2212                 .fc_flags = RTF_UP | flags,
2213                 .fc_nlinfo.nl_net = dev_net(dev),
2214                 .fc_protocol = RTPROT_KERNEL,
2215         };
2216
2217         cfg.fc_dst = *pfx;
2218
2219         /* Prevent useless cloning on PtP SIT.
2220            This thing is done here expecting that the whole
2221            class of non-broadcast devices need not cloning.
2222          */
2223 #if IS_ENABLED(CONFIG_IPV6_SIT)
2224         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2225                 cfg.fc_flags |= RTF_NONEXTHOP;
2226 #endif
2227
2228         ip6_route_add(&cfg);
2229 }
2230
2231
2232 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2233                                                   int plen,
2234                                                   const struct net_device *dev,
2235                                                   u32 flags, u32 noflags)
2236 {
2237         struct fib6_node *fn;
2238         struct rt6_info *rt = NULL;
2239         struct fib6_table *table;
2240         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2241
2242         table = fib6_get_table(dev_net(dev), tb_id);
2243         if (!table)
2244                 return NULL;
2245
2246         read_lock_bh(&table->tb6_lock);
2247         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2248         if (!fn)
2249                 goto out;
2250
2251         noflags |= RTF_CACHE;
2252         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2253                 if (rt->dst.dev->ifindex != dev->ifindex)
2254                         continue;
2255                 if ((rt->rt6i_flags & flags) != flags)
2256                         continue;
2257                 if ((rt->rt6i_flags & noflags) != 0)
2258                         continue;
2259                 dst_hold(&rt->dst);
2260                 break;
2261         }
2262 out:
2263         read_unlock_bh(&table->tb6_lock);
2264         return rt;
2265 }
2266
2267
2268 /* Create "default" multicast route to the interface */
2269
2270 static void addrconf_add_mroute(struct net_device *dev)
2271 {
2272         struct fib6_config cfg = {
2273                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2274                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2275                 .fc_ifindex = dev->ifindex,
2276                 .fc_dst_len = 8,
2277                 .fc_flags = RTF_UP,
2278                 .fc_nlinfo.nl_net = dev_net(dev),
2279         };
2280
2281         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2282
2283         ip6_route_add(&cfg);
2284 }
2285
2286 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2287 {
2288         struct inet6_dev *idev;
2289
2290         ASSERT_RTNL();
2291
2292         idev = ipv6_find_idev(dev);
2293         if (!idev)
2294                 return ERR_PTR(-ENOBUFS);
2295
2296         if (idev->cnf.disable_ipv6)
2297                 return ERR_PTR(-EACCES);
2298
2299         /* Add default multicast route */
2300         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2301                 addrconf_add_mroute(dev);
2302
2303         return idev;
2304 }
2305
2306 static void manage_tempaddrs(struct inet6_dev *idev,
2307                              struct inet6_ifaddr *ifp,
2308                              __u32 valid_lft, __u32 prefered_lft,
2309                              bool create, unsigned long now)
2310 {
2311         u32 flags;
2312         struct inet6_ifaddr *ift;
2313
2314         read_lock_bh(&idev->lock);
2315         /* update all temporary addresses in the list */
2316         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2317                 int age, max_valid, max_prefered;
2318
2319                 if (ifp != ift->ifpub)
2320                         continue;
2321
2322                 /* RFC 4941 section 3.3:
2323                  * If a received option will extend the lifetime of a public
2324                  * address, the lifetimes of temporary addresses should
2325                  * be extended, subject to the overall constraint that no
2326                  * temporary addresses should ever remain "valid" or "preferred"
2327                  * for a time longer than (TEMP_VALID_LIFETIME) or
2328                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2329                  */
2330                 age = (now - ift->cstamp) / HZ;
2331                 max_valid = idev->cnf.temp_valid_lft - age;
2332                 if (max_valid < 0)
2333                         max_valid = 0;
2334
2335                 max_prefered = idev->cnf.temp_prefered_lft -
2336                                idev->cnf.max_desync_factor - age;
2337                 if (max_prefered < 0)
2338                         max_prefered = 0;
2339
2340                 if (valid_lft > max_valid)
2341                         valid_lft = max_valid;
2342
2343                 if (prefered_lft > max_prefered)
2344                         prefered_lft = max_prefered;
2345
2346                 spin_lock(&ift->lock);
2347                 flags = ift->flags;
2348                 ift->valid_lft = valid_lft;
2349                 ift->prefered_lft = prefered_lft;
2350                 ift->tstamp = now;
2351                 if (prefered_lft > 0)
2352                         ift->flags &= ~IFA_F_DEPRECATED;
2353
2354                 spin_unlock(&ift->lock);
2355                 if (!(flags&IFA_F_TENTATIVE))
2356                         ipv6_ifa_notify(0, ift);
2357         }
2358
2359         if ((create || list_empty(&idev->tempaddr_list)) &&
2360             idev->cnf.use_tempaddr > 0) {
2361                 /* When a new public address is created as described
2362                  * in [ADDRCONF], also create a new temporary address.
2363                  * Also create a temporary address if it's enabled but
2364                  * no temporary address currently exists.
2365                  */
2366                 read_unlock_bh(&idev->lock);
2367                 ipv6_create_tempaddr(ifp, NULL);
2368         } else {
2369                 read_unlock_bh(&idev->lock);
2370         }
2371 }
2372
2373 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2374 {
2375         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2376                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2377 }
2378
2379 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2380                                  const struct prefix_info *pinfo,
2381                                  struct inet6_dev *in6_dev,
2382                                  const struct in6_addr *addr, int addr_type,
2383                                  u32 addr_flags, bool sllao, bool tokenized,
2384                                  __u32 valid_lft, u32 prefered_lft)
2385 {
2386         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2387         int create = 0, update_lft = 0;
2388
2389         if (!ifp && valid_lft) {
2390                 int max_addresses = in6_dev->cnf.max_addresses;
2391
2392 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2393                 if (in6_dev->cnf.optimistic_dad &&
2394                     !net->ipv6.devconf_all->forwarding && sllao)
2395                         addr_flags |= IFA_F_OPTIMISTIC;
2396 #endif
2397
2398                 /* Do not allow to create too much of autoconfigured
2399                  * addresses; this would be too easy way to crash kernel.
2400                  */
2401                 if (!max_addresses ||
2402                     ipv6_count_addresses(in6_dev) < max_addresses)
2403                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2404                                             pinfo->prefix_len,
2405                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2406                                             addr_flags, valid_lft,
2407                                             prefered_lft);
2408
2409                 if (IS_ERR_OR_NULL(ifp))
2410                         return -1;
2411
2412                 update_lft = 0;
2413                 create = 1;
2414                 spin_lock_bh(&ifp->lock);
2415                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2416                 ifp->cstamp = jiffies;
2417                 ifp->tokenized = tokenized;
2418                 spin_unlock_bh(&ifp->lock);
2419                 addrconf_dad_start(ifp);
2420         }
2421
2422         if (ifp) {
2423                 u32 flags;
2424                 unsigned long now;
2425                 u32 stored_lft;
2426
2427                 /* update lifetime (RFC2462 5.5.3 e) */
2428                 spin_lock_bh(&ifp->lock);
2429                 now = jiffies;
2430                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2431                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2432                 else
2433                         stored_lft = 0;
2434                 if (!update_lft && !create && stored_lft) {
2435                         const u32 minimum_lft = min_t(u32,
2436                                 stored_lft, MIN_VALID_LIFETIME);
2437                         valid_lft = max(valid_lft, minimum_lft);
2438
2439                         /* RFC4862 Section 5.5.3e:
2440                          * "Note that the preferred lifetime of the
2441                          *  corresponding address is always reset to
2442                          *  the Preferred Lifetime in the received
2443                          *  Prefix Information option, regardless of
2444                          *  whether the valid lifetime is also reset or
2445                          *  ignored."
2446                          *
2447                          * So we should always update prefered_lft here.
2448                          */
2449                         update_lft = 1;
2450                 }
2451
2452                 if (update_lft) {
2453                         ifp->valid_lft = valid_lft;
2454                         ifp->prefered_lft = prefered_lft;
2455                         ifp->tstamp = now;
2456                         flags = ifp->flags;
2457                         ifp->flags &= ~IFA_F_DEPRECATED;
2458                         spin_unlock_bh(&ifp->lock);
2459
2460                         if (!(flags&IFA_F_TENTATIVE))
2461                                 ipv6_ifa_notify(0, ifp);
2462                 } else
2463                         spin_unlock_bh(&ifp->lock);
2464
2465                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2466                                  create, now);
2467
2468                 in6_ifa_put(ifp);
2469                 addrconf_verify();
2470         }
2471
2472         return 0;
2473 }
2474 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2475
2476 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2477 {
2478         struct prefix_info *pinfo;
2479         __u32 valid_lft;
2480         __u32 prefered_lft;
2481         int addr_type, err;
2482         u32 addr_flags = 0;
2483         struct inet6_dev *in6_dev;
2484         struct net *net = dev_net(dev);
2485
2486         pinfo = (struct prefix_info *) opt;
2487
2488         if (len < sizeof(struct prefix_info)) {
2489                 ADBG("addrconf: prefix option too short\n");
2490                 return;
2491         }
2492
2493         /*
2494          *      Validation checks ([ADDRCONF], page 19)
2495          */
2496
2497         addr_type = ipv6_addr_type(&pinfo->prefix);
2498
2499         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2500                 return;
2501
2502         valid_lft = ntohl(pinfo->valid);
2503         prefered_lft = ntohl(pinfo->prefered);
2504
2505         if (prefered_lft > valid_lft) {
2506                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2507                 return;
2508         }
2509
2510         in6_dev = in6_dev_get(dev);
2511
2512         if (!in6_dev) {
2513                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2514                                     dev->name);
2515                 return;
2516         }
2517
2518         /*
2519          *      Two things going on here:
2520          *      1) Add routes for on-link prefixes
2521          *      2) Configure prefixes with the auto flag set
2522          */
2523
2524         if (pinfo->onlink) {
2525                 struct rt6_info *rt;
2526                 unsigned long rt_expires;
2527
2528                 /* Avoid arithmetic overflow. Really, we could
2529                  * save rt_expires in seconds, likely valid_lft,
2530                  * but it would require division in fib gc, that it
2531                  * not good.
2532                  */
2533                 if (HZ > USER_HZ)
2534                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2535                 else
2536                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2537
2538                 if (addrconf_finite_timeout(rt_expires))
2539                         rt_expires *= HZ;
2540
2541                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2542                                                pinfo->prefix_len,
2543                                                dev,
2544                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2545                                                RTF_GATEWAY | RTF_DEFAULT);
2546
2547                 if (rt) {
2548                         /* Autoconf prefix route */
2549                         if (valid_lft == 0) {
2550                                 ip6_del_rt(rt);
2551                                 rt = NULL;
2552                         } else if (addrconf_finite_timeout(rt_expires)) {
2553                                 /* not infinity */
2554                                 rt6_set_expires(rt, jiffies + rt_expires);
2555                         } else {
2556                                 rt6_clean_expires(rt);
2557                         }
2558                 } else if (valid_lft) {
2559                         clock_t expires = 0;
2560                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2561                         if (addrconf_finite_timeout(rt_expires)) {
2562                                 /* not infinity */
2563                                 flags |= RTF_EXPIRES;
2564                                 expires = jiffies_to_clock_t(rt_expires);
2565                         }
2566                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2567                                               dev, expires, flags);
2568                 }
2569                 ip6_rt_put(rt);
2570         }
2571
2572         /* Try to figure out our local address for this prefix */
2573
2574         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2575                 struct in6_addr addr;
2576                 bool tokenized = false, dev_addr_generated = false;
2577
2578                 if (pinfo->prefix_len == 64) {
2579                         memcpy(&addr, &pinfo->prefix, 8);
2580
2581                         if (!ipv6_addr_any(&in6_dev->token)) {
2582                                 read_lock_bh(&in6_dev->lock);
2583                                 memcpy(addr.s6_addr + 8,
2584                                        in6_dev->token.s6_addr + 8, 8);
2585                                 read_unlock_bh(&in6_dev->lock);
2586                                 tokenized = true;
2587                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2588                                    !ipv6_generate_stable_address(&addr, 0,
2589                                                                  in6_dev)) {
2590                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2591                                 goto ok;
2592                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2593                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2594                                 goto put;
2595                         } else {
2596                                 dev_addr_generated = true;
2597                         }
2598                         goto ok;
2599                 }
2600                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2601                                     pinfo->prefix_len);
2602                 goto put;
2603
2604 ok:
2605                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2606                                                    &addr, addr_type,
2607                                                    addr_flags, sllao,
2608                                                    tokenized, valid_lft,
2609                                                    prefered_lft);
2610                 if (err)
2611                         goto put;
2612
2613                 /* Ignore error case here because previous prefix add addr was
2614                  * successful which will be notified.
2615                  */
2616                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2617                                               addr_type, addr_flags, sllao,
2618                                               tokenized, valid_lft,
2619                                               prefered_lft,
2620                                               dev_addr_generated);
2621         }
2622         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2623 put:
2624         in6_dev_put(in6_dev);
2625 }
2626
2627 /*
2628  *      Set destination address.
2629  *      Special case for SIT interfaces where we create a new "virtual"
2630  *      device.
2631  */
2632 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2633 {
2634         struct in6_ifreq ireq;
2635         struct net_device *dev;
2636         int err = -EINVAL;
2637
2638         rtnl_lock();
2639
2640         err = -EFAULT;
2641         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2642                 goto err_exit;
2643
2644         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2645
2646         err = -ENODEV;
2647         if (!dev)
2648                 goto err_exit;
2649
2650 #if IS_ENABLED(CONFIG_IPV6_SIT)
2651         if (dev->type == ARPHRD_SIT) {
2652                 const struct net_device_ops *ops = dev->netdev_ops;
2653                 struct ifreq ifr;
2654                 struct ip_tunnel_parm p;
2655
2656                 err = -EADDRNOTAVAIL;
2657                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2658                         goto err_exit;
2659
2660                 memset(&p, 0, sizeof(p));
2661                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2662                 p.iph.saddr = 0;
2663                 p.iph.version = 4;
2664                 p.iph.ihl = 5;
2665                 p.iph.protocol = IPPROTO_IPV6;
2666                 p.iph.ttl = 64;
2667                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2668
2669                 if (ops->ndo_do_ioctl) {
2670                         mm_segment_t oldfs = get_fs();
2671
2672                         set_fs(KERNEL_DS);
2673                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2674                         set_fs(oldfs);
2675                 } else
2676                         err = -EOPNOTSUPP;
2677
2678                 if (err == 0) {
2679                         err = -ENOBUFS;
2680                         dev = __dev_get_by_name(net, p.name);
2681                         if (!dev)
2682                                 goto err_exit;
2683                         err = dev_open(dev);
2684                 }
2685         }
2686 #endif
2687
2688 err_exit:
2689         rtnl_unlock();
2690         return err;
2691 }
2692
2693 static int ipv6_mc_config(struct sock *sk, bool join,
2694                           const struct in6_addr *addr, int ifindex)
2695 {
2696         int ret;
2697
2698         ASSERT_RTNL();
2699
2700         lock_sock(sk);
2701         if (join)
2702                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2703         else
2704                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2705         release_sock(sk);
2706
2707         return ret;
2708 }
2709
2710 /*
2711  *      Manual configuration of address on an interface
2712  */
2713 static int inet6_addr_add(struct net *net, int ifindex,
2714                           const struct in6_addr *pfx,
2715                           const struct in6_addr *peer_pfx,
2716                           unsigned int plen, __u32 ifa_flags,
2717                           __u32 prefered_lft, __u32 valid_lft)
2718 {
2719         struct inet6_ifaddr *ifp;
2720         struct inet6_dev *idev;
2721         struct net_device *dev;
2722         unsigned long timeout;
2723         clock_t expires;
2724         int scope;
2725         u32 flags;
2726
2727         ASSERT_RTNL();
2728
2729         if (plen > 128)
2730                 return -EINVAL;
2731
2732         /* check the lifetime */
2733         if (!valid_lft || prefered_lft > valid_lft)
2734                 return -EINVAL;
2735
2736         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2737                 return -EINVAL;
2738
2739         dev = __dev_get_by_index(net, ifindex);
2740         if (!dev)
2741                 return -ENODEV;
2742
2743         idev = addrconf_add_dev(dev);
2744         if (IS_ERR(idev))
2745                 return PTR_ERR(idev);
2746
2747         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2748                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2749                                          true, pfx, ifindex);
2750
2751                 if (ret < 0)
2752                         return ret;
2753         }
2754
2755         scope = ipv6_addr_scope(pfx);
2756
2757         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2758         if (addrconf_finite_timeout(timeout)) {
2759                 expires = jiffies_to_clock_t(timeout * HZ);
2760                 valid_lft = timeout;
2761                 flags = RTF_EXPIRES;
2762         } else {
2763                 expires = 0;
2764                 flags = 0;
2765                 ifa_flags |= IFA_F_PERMANENT;
2766         }
2767
2768         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2769         if (addrconf_finite_timeout(timeout)) {
2770                 if (timeout == 0)
2771                         ifa_flags |= IFA_F_DEPRECATED;
2772                 prefered_lft = timeout;
2773         }
2774
2775         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2776                             valid_lft, prefered_lft);
2777
2778         if (!IS_ERR(ifp)) {
2779                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2780                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2781                                               expires, flags);
2782                 }
2783
2784                 /*
2785                  * Note that section 3.1 of RFC 4429 indicates
2786                  * that the Optimistic flag should not be set for
2787                  * manually configured addresses
2788                  */
2789                 addrconf_dad_start(ifp);
2790                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2791                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2792                                          true, jiffies);
2793                 in6_ifa_put(ifp);
2794                 addrconf_verify_rtnl();
2795                 return 0;
2796         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2797                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2798                                false, pfx, ifindex);
2799         }
2800
2801         return PTR_ERR(ifp);
2802 }
2803
2804 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2805                           const struct in6_addr *pfx, unsigned int plen)
2806 {
2807         struct inet6_ifaddr *ifp;
2808         struct inet6_dev *idev;
2809         struct net_device *dev;
2810
2811         if (plen > 128)
2812                 return -EINVAL;
2813
2814         dev = __dev_get_by_index(net, ifindex);
2815         if (!dev)
2816                 return -ENODEV;
2817
2818         idev = __in6_dev_get(dev);
2819         if (!idev)
2820                 return -ENXIO;
2821
2822         read_lock_bh(&idev->lock);
2823         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2824                 if (ifp->prefix_len == plen &&
2825                     ipv6_addr_equal(pfx, &ifp->addr)) {
2826                         in6_ifa_hold(ifp);
2827                         read_unlock_bh(&idev->lock);
2828
2829                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2830                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2831                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2832                                                  jiffies);
2833                         ipv6_del_addr(ifp);
2834                         addrconf_verify_rtnl();
2835                         if (ipv6_addr_is_multicast(pfx)) {
2836                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2837                                                false, pfx, dev->ifindex);
2838                         }
2839                         return 0;
2840                 }
2841         }
2842         read_unlock_bh(&idev->lock);
2843         return -EADDRNOTAVAIL;
2844 }
2845
2846
2847 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2848 {
2849         struct in6_ifreq ireq;
2850         int err;
2851
2852         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2853                 return -EPERM;
2854
2855         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2856                 return -EFAULT;
2857
2858         rtnl_lock();
2859         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2860                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2861                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2862         rtnl_unlock();
2863         return err;
2864 }
2865
2866 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2867 {
2868         struct in6_ifreq ireq;
2869         int err;
2870
2871         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2872                 return -EPERM;
2873
2874         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2875                 return -EFAULT;
2876
2877         rtnl_lock();
2878         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2879                              ireq.ifr6_prefixlen);
2880         rtnl_unlock();
2881         return err;
2882 }
2883
2884 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2885                      int plen, int scope)
2886 {
2887         struct inet6_ifaddr *ifp;
2888
2889         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2890                             scope, IFA_F_PERMANENT,
2891                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2892         if (!IS_ERR(ifp)) {
2893                 spin_lock_bh(&ifp->lock);
2894                 ifp->flags &= ~IFA_F_TENTATIVE;
2895                 spin_unlock_bh(&ifp->lock);
2896                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2897                 in6_ifa_put(ifp);
2898         }
2899 }
2900
2901 #if IS_ENABLED(CONFIG_IPV6_SIT)
2902 static void sit_add_v4_addrs(struct inet6_dev *idev)
2903 {
2904         struct in6_addr addr;
2905         struct net_device *dev;
2906         struct net *net = dev_net(idev->dev);
2907         int scope, plen;
2908         u32 pflags = 0;
2909
2910         ASSERT_RTNL();
2911
2912         memset(&addr, 0, sizeof(struct in6_addr));
2913         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2914
2915         if (idev->dev->flags&IFF_POINTOPOINT) {
2916                 addr.s6_addr32[0] = htonl(0xfe800000);
2917                 scope = IFA_LINK;
2918                 plen = 64;
2919         } else {
2920                 scope = IPV6_ADDR_COMPATv4;
2921                 plen = 96;
2922                 pflags |= RTF_NONEXTHOP;
2923         }
2924
2925         if (addr.s6_addr32[3]) {
2926                 add_addr(idev, &addr, plen, scope);
2927                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2928                 return;
2929         }
2930
2931         for_each_netdev(net, dev) {
2932                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2933                 if (in_dev && (dev->flags & IFF_UP)) {
2934                         struct in_ifaddr *ifa;
2935
2936                         int flag = scope;
2937
2938                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2939
2940                                 addr.s6_addr32[3] = ifa->ifa_local;
2941
2942                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2943                                         continue;
2944                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2945                                         if (idev->dev->flags&IFF_POINTOPOINT)
2946                                                 continue;
2947                                         flag |= IFA_HOST;
2948                                 }
2949
2950                                 add_addr(idev, &addr, plen, flag);
2951                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2952                                                       pflags);
2953                         }
2954                 }
2955         }
2956 }
2957 #endif
2958
2959 static void init_loopback(struct net_device *dev)
2960 {
2961         struct inet6_dev  *idev;
2962         struct net_device *sp_dev;
2963         struct inet6_ifaddr *sp_ifa;
2964         struct rt6_info *sp_rt;
2965
2966         /* ::1 */
2967
2968         ASSERT_RTNL();
2969
2970         idev = ipv6_find_idev(dev);
2971         if (!idev) {
2972                 pr_debug("%s: add_dev failed\n", __func__);
2973                 return;
2974         }
2975
2976         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2977
2978         /* Add routes to other interface's IPv6 addresses */
2979         for_each_netdev(dev_net(dev), sp_dev) {
2980                 if (!strcmp(sp_dev->name, dev->name))
2981                         continue;
2982
2983                 idev = __in6_dev_get(sp_dev);
2984                 if (!idev)
2985                         continue;
2986
2987                 read_lock_bh(&idev->lock);
2988                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2989
2990                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2991                                 continue;
2992
2993                         if (sp_ifa->rt) {
2994                                 /* This dst has been added to garbage list when
2995                                  * lo device down, release this obsolete dst and
2996                                  * reallocate a new router for ifa.
2997                                  */
2998                                 if (sp_ifa->rt->dst.obsolete > 0) {
2999                                         ip6_rt_put(sp_ifa->rt);
3000                                         sp_ifa->rt = NULL;
3001                                 } else {
3002                                         continue;
3003                                 }
3004                         }
3005
3006                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3007
3008                         /* Failure cases are ignored */
3009                         if (!IS_ERR(sp_rt)) {
3010                                 sp_ifa->rt = sp_rt;
3011                                 ip6_ins_rt(sp_rt);
3012                         }
3013                 }
3014                 read_unlock_bh(&idev->lock);
3015         }
3016 }
3017
3018 void addrconf_add_linklocal(struct inet6_dev *idev,
3019                             const struct in6_addr *addr, u32 flags)
3020 {
3021         struct inet6_ifaddr *ifp;
3022         u32 addr_flags = flags | IFA_F_PERMANENT;
3023
3024 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3025         if (idev->cnf.optimistic_dad &&
3026             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3027                 addr_flags |= IFA_F_OPTIMISTIC;
3028 #endif
3029
3030         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3031                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3032         if (!IS_ERR(ifp)) {
3033                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3034                 addrconf_dad_start(ifp);
3035                 in6_ifa_put(ifp);
3036         }
3037 }
3038 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3039
3040 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3041 {
3042         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3043                 return true;
3044
3045         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3046             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3047                 return true;
3048
3049         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3050             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3051                 return true;
3052
3053         return false;
3054 }
3055
3056 static int ipv6_generate_stable_address(struct in6_addr *address,
3057                                         u8 dad_count,
3058                                         const struct inet6_dev *idev)
3059 {
3060         static DEFINE_SPINLOCK(lock);
3061         static __u32 digest[SHA_DIGEST_WORDS];
3062         static __u32 workspace[SHA_WORKSPACE_WORDS];
3063
3064         static union {
3065                 char __data[SHA_MESSAGE_BYTES];
3066                 struct {
3067                         struct in6_addr secret;
3068                         __be32 prefix[2];
3069                         unsigned char hwaddr[MAX_ADDR_LEN];
3070                         u8 dad_count;
3071                 } __packed;
3072         } data;
3073
3074         struct in6_addr secret;
3075         struct in6_addr temp;
3076         struct net *net = dev_net(idev->dev);
3077
3078         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3079
3080         if (idev->cnf.stable_secret.initialized)
3081                 secret = idev->cnf.stable_secret.secret;
3082         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3083                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3084         else
3085                 return -1;
3086
3087 retry:
3088         spin_lock_bh(&lock);
3089
3090         sha_init(digest);
3091         memset(&data, 0, sizeof(data));
3092         memset(workspace, 0, sizeof(workspace));
3093         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3094         data.prefix[0] = address->s6_addr32[0];
3095         data.prefix[1] = address->s6_addr32[1];
3096         data.secret = secret;
3097         data.dad_count = dad_count;
3098
3099         sha_transform(digest, data.__data, workspace);
3100
3101         temp = *address;
3102         temp.s6_addr32[2] = (__force __be32)digest[0];
3103         temp.s6_addr32[3] = (__force __be32)digest[1];
3104
3105         spin_unlock_bh(&lock);
3106
3107         if (ipv6_reserved_interfaceid(temp)) {
3108                 dad_count++;
3109                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3110                         return -1;
3111                 goto retry;
3112         }
3113
3114         *address = temp;
3115         return 0;
3116 }
3117
3118 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3119 {
3120         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3121
3122         if (s->initialized)
3123                 return;
3124         s = &idev->cnf.stable_secret;
3125         get_random_bytes(&s->secret, sizeof(s->secret));
3126         s->initialized = true;
3127 }
3128
3129 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3130 {
3131         struct in6_addr addr;
3132
3133         /* no link local addresses on L3 master devices */
3134         if (netif_is_l3_master(idev->dev))
3135                 return;
3136
3137         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3138
3139         switch (idev->addr_gen_mode) {
3140         case IN6_ADDR_GEN_MODE_RANDOM:
3141                 ipv6_gen_mode_random_init(idev);
3142                 /* fallthrough */
3143         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3144                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3145                         addrconf_add_linklocal(idev, &addr,
3146                                                IFA_F_STABLE_PRIVACY);
3147                 else if (prefix_route)
3148                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3149                 break;
3150         case IN6_ADDR_GEN_MODE_EUI64:
3151                 /* addrconf_add_linklocal also adds a prefix_route and we
3152                  * only need to care about prefix routes if ipv6_generate_eui64
3153                  * couldn't generate one.
3154                  */
3155                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3156                         addrconf_add_linklocal(idev, &addr, 0);
3157                 else if (prefix_route)
3158                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3159                 break;
3160         case IN6_ADDR_GEN_MODE_NONE:
3161         default:
3162                 /* will not add any link local address */
3163                 break;
3164         }
3165 }
3166
3167 static void addrconf_dev_config(struct net_device *dev)
3168 {
3169         struct inet6_dev *idev;
3170
3171         ASSERT_RTNL();
3172
3173         if ((dev->type != ARPHRD_ETHER) &&
3174             (dev->type != ARPHRD_FDDI) &&
3175             (dev->type != ARPHRD_ARCNET) &&
3176             (dev->type != ARPHRD_INFINIBAND) &&
3177             (dev->type != ARPHRD_IEEE1394) &&
3178             (dev->type != ARPHRD_TUNNEL6) &&
3179             (dev->type != ARPHRD_6LOWPAN) &&
3180             (dev->type != ARPHRD_NONE)) {
3181                 /* Alas, we support only Ethernet autoconfiguration. */
3182                 return;
3183         }
3184
3185         idev = addrconf_add_dev(dev);
3186         if (IS_ERR(idev))
3187                 return;
3188
3189         /* this device type has no EUI support */
3190         if (dev->type == ARPHRD_NONE &&
3191             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3192                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3193
3194         addrconf_addr_gen(idev, false);
3195 }
3196
3197 #if IS_ENABLED(CONFIG_IPV6_SIT)
3198 static void addrconf_sit_config(struct net_device *dev)
3199 {
3200         struct inet6_dev *idev;
3201
3202         ASSERT_RTNL();
3203
3204         /*
3205          * Configure the tunnel with one of our IPv4
3206          * addresses... we should configure all of
3207          * our v4 addrs in the tunnel
3208          */
3209
3210         idev = ipv6_find_idev(dev);
3211         if (!idev) {
3212                 pr_debug("%s: add_dev failed\n", __func__);
3213                 return;
3214         }
3215
3216         if (dev->priv_flags & IFF_ISATAP) {
3217                 addrconf_addr_gen(idev, false);
3218                 return;
3219         }
3220
3221         sit_add_v4_addrs(idev);
3222
3223         if (dev->flags&IFF_POINTOPOINT)
3224                 addrconf_add_mroute(dev);
3225 }
3226 #endif
3227
3228 #if IS_ENABLED(CONFIG_NET_IPGRE)
3229 static void addrconf_gre_config(struct net_device *dev)
3230 {
3231         struct inet6_dev *idev;
3232
3233         ASSERT_RTNL();
3234
3235         idev = ipv6_find_idev(dev);
3236         if (!idev) {
3237                 pr_debug("%s: add_dev failed\n", __func__);
3238                 return;
3239         }
3240
3241         addrconf_addr_gen(idev, true);
3242         if (dev->flags & IFF_POINTOPOINT)
3243                 addrconf_add_mroute(dev);
3244 }
3245 #endif
3246
3247 static int fixup_permanent_addr(struct inet6_dev *idev,
3248                                 struct inet6_ifaddr *ifp)
3249 {
3250         if (!ifp->rt) {
3251                 struct rt6_info *rt;
3252
3253                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3254                 if (unlikely(IS_ERR(rt)))
3255                         return PTR_ERR(rt);
3256
3257                 ifp->rt = rt;
3258         }
3259
3260         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3261                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3262                                       idev->dev, 0, 0);
3263         }
3264
3265         addrconf_dad_start(ifp);
3266
3267         return 0;
3268 }
3269
3270 static void addrconf_permanent_addr(struct net_device *dev)
3271 {
3272         struct inet6_ifaddr *ifp, *tmp;
3273         struct inet6_dev *idev;
3274
3275         idev = __in6_dev_get(dev);
3276         if (!idev)
3277                 return;
3278
3279         write_lock_bh(&idev->lock);
3280
3281         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3282                 if ((ifp->flags & IFA_F_PERMANENT) &&
3283                     fixup_permanent_addr(idev, ifp) < 0) {
3284                         write_unlock_bh(&idev->lock);
3285                         ipv6_del_addr(ifp);
3286                         write_lock_bh(&idev->lock);
3287
3288                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3289                                              idev->dev->name, &ifp->addr);
3290                 }
3291         }
3292
3293         write_unlock_bh(&idev->lock);
3294 }
3295
3296 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3297                            void *ptr)
3298 {
3299         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3300         struct netdev_notifier_changeupper_info *info;
3301         struct inet6_dev *idev = __in6_dev_get(dev);
3302         int run_pending = 0;
3303         int err;
3304
3305         switch (event) {
3306         case NETDEV_REGISTER:
3307                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3308                         idev = ipv6_add_dev(dev);
3309                         if (IS_ERR(idev))
3310                                 return notifier_from_errno(PTR_ERR(idev));
3311                 }
3312                 break;
3313
3314         case NETDEV_CHANGEMTU:
3315                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3316                 if (dev->mtu < IPV6_MIN_MTU) {
3317                         addrconf_ifdown(dev, 1);
3318                         break;
3319                 }
3320
3321                 if (idev) {
3322                         rt6_mtu_change(dev, dev->mtu);
3323                         idev->cnf.mtu6 = dev->mtu;
3324                         break;
3325                 }
3326
3327                 /* allocate new idev */
3328                 idev = ipv6_add_dev(dev);
3329                 if (IS_ERR(idev))
3330                         break;
3331
3332                 /* device is still not ready */
3333                 if (!(idev->if_flags & IF_READY))
3334                         break;
3335
3336                 run_pending = 1;
3337
3338                 /* fall through */
3339
3340         case NETDEV_UP:
3341         case NETDEV_CHANGE:
3342                 if (dev->flags & IFF_SLAVE)
3343                         break;
3344
3345                 if (idev && idev->cnf.disable_ipv6)
3346                         break;
3347
3348                 if (event == NETDEV_UP) {
3349                         /* restore routes for permanent addresses */
3350                         addrconf_permanent_addr(dev);
3351
3352                         if (!addrconf_qdisc_ok(dev)) {
3353                                 /* device is not ready yet. */
3354                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3355                                         dev->name);
3356                                 break;
3357                         }
3358
3359                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3360                                 idev = ipv6_add_dev(dev);
3361
3362                         if (!IS_ERR_OR_NULL(idev)) {
3363                                 idev->if_flags |= IF_READY;
3364                                 run_pending = 1;
3365                         }
3366                 } else if (event == NETDEV_CHANGE) {
3367                         if (!addrconf_qdisc_ok(dev)) {
3368                                 /* device is still not ready. */
3369                                 break;
3370                         }
3371
3372                         if (idev) {
3373                                 if (idev->if_flags & IF_READY)
3374                                         /* device is already configured. */
3375                                         break;
3376                                 idev->if_flags |= IF_READY;
3377                         }
3378
3379                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3380                                 dev->name);
3381
3382                         run_pending = 1;
3383                 }
3384
3385                 switch (dev->type) {
3386 #if IS_ENABLED(CONFIG_IPV6_SIT)
3387                 case ARPHRD_SIT:
3388                         addrconf_sit_config(dev);
3389                         break;
3390 #endif
3391 #if IS_ENABLED(CONFIG_NET_IPGRE)
3392                 case ARPHRD_IPGRE:
3393                         addrconf_gre_config(dev);
3394                         break;
3395 #endif
3396                 case ARPHRD_LOOPBACK:
3397                         init_loopback(dev);
3398                         break;
3399
3400                 default:
3401                         addrconf_dev_config(dev);
3402                         break;
3403                 }
3404
3405                 if (!IS_ERR_OR_NULL(idev)) {
3406                         if (run_pending)
3407                                 addrconf_dad_run(idev);
3408
3409                         /*
3410                          * If the MTU changed during the interface down,
3411                          * when the interface up, the changed MTU must be
3412                          * reflected in the idev as well as routers.
3413                          */
3414                         if (idev->cnf.mtu6 != dev->mtu &&
3415                             dev->mtu >= IPV6_MIN_MTU) {
3416                                 rt6_mtu_change(dev, dev->mtu);
3417                                 idev->cnf.mtu6 = dev->mtu;
3418                         }
3419                         idev->tstamp = jiffies;
3420                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3421
3422                         /*
3423                          * If the changed mtu during down is lower than
3424                          * IPV6_MIN_MTU stop IPv6 on this interface.
3425                          */
3426                         if (dev->mtu < IPV6_MIN_MTU)
3427                                 addrconf_ifdown(dev, 1);
3428                 }
3429                 break;
3430
3431         case NETDEV_DOWN:
3432         case NETDEV_UNREGISTER:
3433                 /*
3434                  *      Remove all addresses from this interface.
3435                  */
3436                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3437                 break;
3438
3439         case NETDEV_CHANGENAME:
3440                 if (idev) {
3441                         snmp6_unregister_dev(idev);
3442                         addrconf_sysctl_unregister(idev);
3443                         err = addrconf_sysctl_register(idev);
3444                         if (err)
3445                                 return notifier_from_errno(err);
3446                         err = snmp6_register_dev(idev);
3447                         if (err) {
3448                                 addrconf_sysctl_unregister(idev);
3449                                 return notifier_from_errno(err);
3450                         }
3451                 }
3452                 break;
3453
3454         case NETDEV_PRE_TYPE_CHANGE:
3455         case NETDEV_POST_TYPE_CHANGE:
3456                 if (idev)
3457                         addrconf_type_change(dev, event);
3458                 break;
3459
3460         case NETDEV_CHANGEUPPER:
3461                 info = ptr;
3462
3463                 /* flush all routes if dev is linked to or unlinked from
3464                  * an L3 master device (e.g., VRF)
3465                  */
3466                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3467                         addrconf_ifdown(dev, 0);
3468         }
3469
3470         return NOTIFY_OK;
3471 }
3472
3473 /*
3474  *      addrconf module should be notified of a device going up
3475  */
3476 static struct notifier_block ipv6_dev_notf = {
3477         .notifier_call = addrconf_notify,
3478 };
3479
3480 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3481 {
3482         struct inet6_dev *idev;
3483         ASSERT_RTNL();
3484
3485         idev = __in6_dev_get(dev);
3486
3487         if (event == NETDEV_POST_TYPE_CHANGE)
3488                 ipv6_mc_remap(idev);
3489         else if (event == NETDEV_PRE_TYPE_CHANGE)
3490                 ipv6_mc_unmap(idev);
3491 }
3492
3493 static bool addr_is_local(const struct in6_addr *addr)
3494 {
3495         return ipv6_addr_type(addr) &
3496                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3497 }
3498
3499 static int addrconf_ifdown(struct net_device *dev, int how)
3500 {
3501         struct net *net = dev_net(dev);
3502         struct inet6_dev *idev;
3503         struct inet6_ifaddr *ifa, *tmp;
3504         struct list_head del_list;
3505         int _keep_addr;
3506         bool keep_addr;
3507         int state, i;
3508
3509         ASSERT_RTNL();
3510
3511         rt6_ifdown(net, dev);
3512         neigh_ifdown(&nd_tbl, dev);
3513
3514         idev = __in6_dev_get(dev);
3515         if (!idev)
3516                 return -ENODEV;
3517
3518         /*
3519          * Step 1: remove reference to ipv6 device from parent device.
3520          *         Do not dev_put!
3521          */
3522         if (how) {
3523                 idev->dead = 1;
3524
3525                 /* protected by rtnl_lock */
3526                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3527
3528                 /* Step 1.5: remove snmp6 entry */
3529                 snmp6_unregister_dev(idev);
3530
3531         }
3532
3533         /* aggregate the system setting and interface setting */
3534         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3535         if (!_keep_addr)
3536                 _keep_addr = idev->cnf.keep_addr_on_down;
3537
3538         /* combine the user config with event to determine if permanent
3539          * addresses are to be removed from address hash table
3540          */
3541         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3542
3543         /* Step 2: clear hash table */
3544         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3545                 struct hlist_head *h = &inet6_addr_lst[i];
3546
3547                 spin_lock_bh(&addrconf_hash_lock);
3548 restart:
3549                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3550                         if (ifa->idev == idev) {
3551                                 addrconf_del_dad_work(ifa);
3552                                 /* combined flag + permanent flag decide if
3553                                  * address is retained on a down event
3554                                  */
3555                                 if (!keep_addr ||
3556                                     !(ifa->flags & IFA_F_PERMANENT) ||
3557                                     addr_is_local(&ifa->addr)) {
3558                                         hlist_del_init_rcu(&ifa->addr_lst);
3559                                         goto restart;
3560                                 }
3561                         }
3562                 }
3563                 spin_unlock_bh(&addrconf_hash_lock);
3564         }
3565
3566         write_lock_bh(&idev->lock);
3567
3568         addrconf_del_rs_timer(idev);
3569
3570         /* Step 2: clear flags for stateless addrconf */
3571         if (!how)
3572                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3573
3574         if (how && del_timer(&idev->regen_timer))
3575                 in6_dev_put(idev);
3576
3577         /* Step 3: clear tempaddr list */
3578         while (!list_empty(&idev->tempaddr_list)) {
3579                 ifa = list_first_entry(&idev->tempaddr_list,
3580                                        struct inet6_ifaddr, tmp_list);
3581                 list_del(&ifa->tmp_list);
3582                 write_unlock_bh(&idev->lock);
3583                 spin_lock_bh(&ifa->lock);
3584
3585                 if (ifa->ifpub) {
3586                         in6_ifa_put(ifa->ifpub);
3587                         ifa->ifpub = NULL;
3588                 }
3589                 spin_unlock_bh(&ifa->lock);
3590                 in6_ifa_put(ifa);
3591                 write_lock_bh(&idev->lock);
3592         }
3593
3594         /* re-combine the user config with event to determine if permanent
3595          * addresses are to be removed from the interface list
3596          */
3597         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3598
3599         INIT_LIST_HEAD(&del_list);
3600         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3601                 struct rt6_info *rt = NULL;
3602
3603                 addrconf_del_dad_work(ifa);
3604
3605                 write_unlock_bh(&idev->lock);
3606                 spin_lock_bh(&ifa->lock);
3607
3608                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3609                     !addr_is_local(&ifa->addr)) {
3610                         /* set state to skip the notifier below */
3611                         state = INET6_IFADDR_STATE_DEAD;
3612                         ifa->state = 0;
3613                         if (!(ifa->flags & IFA_F_NODAD))
3614                                 ifa->flags |= IFA_F_TENTATIVE;
3615
3616                         rt = ifa->rt;
3617                         ifa->rt = NULL;
3618                 } else {
3619                         state = ifa->state;
3620                         ifa->state = INET6_IFADDR_STATE_DEAD;
3621
3622                         list_move(&ifa->if_list, &del_list);
3623                 }
3624
3625                 spin_unlock_bh(&ifa->lock);
3626
3627                 if (rt)
3628                         ip6_del_rt(rt);
3629
3630                 if (state != INET6_IFADDR_STATE_DEAD) {
3631                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3632                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3633                 } else {
3634                         if (idev->cnf.forwarding)
3635                                 addrconf_leave_anycast(ifa);
3636                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3637                 }
3638
3639                 write_lock_bh(&idev->lock);
3640         }
3641
3642         write_unlock_bh(&idev->lock);
3643
3644         /* now clean up addresses to be removed */
3645         while (!list_empty(&del_list)) {
3646                 ifa = list_first_entry(&del_list,
3647                                        struct inet6_ifaddr, if_list);
3648                 list_del(&ifa->if_list);
3649
3650                 in6_ifa_put(ifa);
3651         }
3652
3653         /* Step 5: Discard anycast and multicast list */
3654         if (how) {
3655                 ipv6_ac_destroy_dev(idev);
3656                 ipv6_mc_destroy_dev(idev);
3657         } else {
3658                 ipv6_mc_down(idev);
3659         }
3660
3661         idev->tstamp = jiffies;
3662
3663         /* Last: Shot the device (if unregistered) */
3664         if (how) {
3665                 addrconf_sysctl_unregister(idev);
3666                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3667                 neigh_ifdown(&nd_tbl, dev);
3668                 in6_dev_put(idev);
3669         }
3670         return 0;
3671 }
3672
3673 static void addrconf_rs_timer(unsigned long data)
3674 {
3675         struct inet6_dev *idev = (struct inet6_dev *)data;
3676         struct net_device *dev = idev->dev;
3677         struct in6_addr lladdr;
3678
3679         write_lock(&idev->lock);
3680         if (idev->dead || !(idev->if_flags & IF_READY))
3681                 goto out;
3682
3683         if (!ipv6_accept_ra(idev))
3684                 goto out;
3685
3686         /* Announcement received after solicitation was sent */
3687         if (idev->if_flags & IF_RA_RCVD)
3688                 goto out;
3689
3690         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3691                 write_unlock(&idev->lock);
3692                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3693                         ndisc_send_rs(dev, &lladdr,
3694                                       &in6addr_linklocal_allrouters);
3695                 else
3696                         goto put;
3697
3698                 write_lock(&idev->lock);
3699                 /* The wait after the last probe can be shorter */
3700                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3701                                              idev->cnf.rtr_solicits) ?
3702                                       idev->cnf.rtr_solicit_delay :
3703                                       idev->cnf.rtr_solicit_interval);
3704         } else {
3705                 /*
3706                  * Note: we do not support deprecated "all on-link"
3707                  * assumption any longer.
3708                  */
3709                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3710         }
3711
3712 out:
3713         write_unlock(&idev->lock);
3714 put:
3715         in6_dev_put(idev);
3716 }
3717
3718 /*
3719  *      Duplicate Address Detection
3720  */
3721 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3722 {
3723         unsigned long rand_num;
3724         struct inet6_dev *idev = ifp->idev;
3725
3726         if (ifp->flags & IFA_F_OPTIMISTIC)
3727                 rand_num = 0;
3728         else
3729                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3730
3731         ifp->dad_probes = idev->cnf.dad_transmits;
3732         addrconf_mod_dad_work(ifp, rand_num);
3733 }
3734
3735 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3736 {
3737         struct inet6_dev *idev = ifp->idev;
3738         struct net_device *dev = idev->dev;
3739         bool notify = false;
3740
3741         addrconf_join_solict(dev, &ifp->addr);
3742
3743         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3744
3745         read_lock_bh(&idev->lock);
3746         spin_lock(&ifp->lock);
3747         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3748                 goto out;
3749
3750         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3751             idev->cnf.accept_dad < 1 ||
3752             !(ifp->flags&IFA_F_TENTATIVE) ||
3753             ifp->flags & IFA_F_NODAD) {
3754                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3755                 spin_unlock(&ifp->lock);
3756                 read_unlock_bh(&idev->lock);
3757
3758                 addrconf_dad_completed(ifp);
3759                 return;
3760         }
3761
3762         if (!(idev->if_flags & IF_READY)) {
3763                 spin_unlock(&ifp->lock);
3764                 read_unlock_bh(&idev->lock);
3765                 /*
3766                  * If the device is not ready:
3767                  * - keep it tentative if it is a permanent address.
3768                  * - otherwise, kill it.
3769                  */
3770                 in6_ifa_hold(ifp);
3771                 addrconf_dad_stop(ifp, 0);
3772                 return;
3773         }
3774
3775         /*
3776          * Optimistic nodes can start receiving
3777          * Frames right away
3778          */
3779         if (ifp->flags & IFA_F_OPTIMISTIC) {
3780                 ip6_ins_rt(ifp->rt);
3781                 if (ipv6_use_optimistic_addr(idev)) {
3782                         /* Because optimistic nodes can use this address,
3783                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3784                          */
3785                         notify = true;
3786                 }
3787         }
3788
3789         addrconf_dad_kick(ifp);
3790 out:
3791         spin_unlock(&ifp->lock);
3792         read_unlock_bh(&idev->lock);
3793         if (notify)
3794                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3795 }
3796
3797 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3798 {
3799         bool begin_dad = false;
3800
3801         spin_lock_bh(&ifp->lock);
3802         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3803                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3804                 begin_dad = true;
3805         }
3806         spin_unlock_bh(&ifp->lock);
3807
3808         if (begin_dad)
3809                 addrconf_mod_dad_work(ifp, 0);
3810 }
3811
3812 static void addrconf_dad_work(struct work_struct *w)
3813 {
3814         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3815                                                 struct inet6_ifaddr,
3816                                                 dad_work);
3817         struct inet6_dev *idev = ifp->idev;
3818         struct in6_addr mcaddr;
3819         bool disable_ipv6 = false;
3820
3821         enum {
3822                 DAD_PROCESS,
3823                 DAD_BEGIN,
3824                 DAD_ABORT,
3825         } action = DAD_PROCESS;
3826
3827         rtnl_lock();
3828
3829         spin_lock_bh(&ifp->lock);
3830         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3831                 action = DAD_BEGIN;
3832                 ifp->state = INET6_IFADDR_STATE_DAD;
3833         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3834                 action = DAD_ABORT;
3835                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3836
3837                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3838                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3839                         struct in6_addr addr;
3840
3841                         addr.s6_addr32[0] = htonl(0xfe800000);
3842                         addr.s6_addr32[1] = 0;
3843
3844                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3845                             ipv6_addr_equal(&ifp->addr, &addr)) {
3846                                 /* DAD failed for link-local based on MAC */
3847                                 idev->cnf.disable_ipv6 = 1;
3848
3849                                 pr_info("%s: IPv6 being disabled!\n",
3850                                         ifp->idev->dev->name);
3851                                 disable_ipv6 = true;
3852                         }
3853                 }
3854         }
3855         spin_unlock_bh(&ifp->lock);
3856
3857         if (action == DAD_BEGIN) {
3858                 addrconf_dad_begin(ifp);
3859                 goto out;
3860         } else if (action == DAD_ABORT) {
3861                 in6_ifa_hold(ifp);
3862                 addrconf_dad_stop(ifp, 1);
3863                 if (disable_ipv6)
3864                         addrconf_ifdown(idev->dev, 0);
3865                 goto out;
3866         }
3867
3868         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3869                 goto out;
3870
3871         write_lock_bh(&idev->lock);
3872         if (idev->dead || !(idev->if_flags & IF_READY)) {
3873                 write_unlock_bh(&idev->lock);
3874                 goto out;
3875         }
3876
3877         spin_lock(&ifp->lock);
3878         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3879                 spin_unlock(&ifp->lock);
3880                 write_unlock_bh(&idev->lock);
3881                 goto out;
3882         }
3883
3884         if (ifp->dad_probes == 0) {
3885                 /*
3886                  * DAD was successful
3887                  */
3888
3889                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3890                 spin_unlock(&ifp->lock);
3891                 write_unlock_bh(&idev->lock);
3892
3893                 addrconf_dad_completed(ifp);
3894
3895                 goto out;
3896         }
3897
3898         ifp->dad_probes--;
3899         addrconf_mod_dad_work(ifp,
3900                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3901         spin_unlock(&ifp->lock);
3902         write_unlock_bh(&idev->lock);
3903
3904         /* send a neighbour solicitation for our addr */
3905         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3906         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3907 out:
3908         in6_ifa_put(ifp);
3909         rtnl_unlock();
3910 }
3911
3912 /* ifp->idev must be at least read locked */
3913 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3914 {
3915         struct inet6_ifaddr *ifpiter;
3916         struct inet6_dev *idev = ifp->idev;
3917
3918         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3919                 if (ifpiter->scope > IFA_LINK)
3920                         break;
3921                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3922                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3923                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3924                     IFA_F_PERMANENT)
3925                         return false;
3926         }
3927         return true;
3928 }
3929
3930 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3931 {
3932         struct net_device *dev = ifp->idev->dev;
3933         struct in6_addr lladdr;
3934         bool send_rs, send_mld;
3935
3936         addrconf_del_dad_work(ifp);
3937
3938         /*
3939          *      Configure the address for reception. Now it is valid.
3940          */
3941
3942         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3943
3944         /* If added prefix is link local and we are prepared to process
3945            router advertisements, start sending router solicitations.
3946          */
3947
3948         read_lock_bh(&ifp->idev->lock);
3949         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3950         send_rs = send_mld &&
3951                   ipv6_accept_ra(ifp->idev) &&
3952                   ifp->idev->cnf.rtr_solicits > 0 &&
3953                   (dev->flags&IFF_LOOPBACK) == 0;
3954         read_unlock_bh(&ifp->idev->lock);
3955
3956         /* While dad is in progress mld report's source address is in6_addrany.
3957          * Resend with proper ll now.
3958          */
3959         if (send_mld)
3960                 ipv6_mc_dad_complete(ifp->idev);
3961
3962         if (send_rs) {
3963                 /*
3964                  *      If a host as already performed a random delay
3965                  *      [...] as part of DAD [...] there is no need
3966                  *      to delay again before sending the first RS
3967                  */
3968                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3969                         return;
3970                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3971
3972                 write_lock_bh(&ifp->idev->lock);
3973                 spin_lock(&ifp->lock);
3974                 ifp->idev->rs_probes = 1;
3975                 ifp->idev->if_flags |= IF_RS_SENT;
3976                 addrconf_mod_rs_timer(ifp->idev,
3977                                       ifp->idev->cnf.rtr_solicit_interval);
3978                 spin_unlock(&ifp->lock);
3979                 write_unlock_bh(&ifp->idev->lock);
3980         }
3981 }
3982
3983 static void addrconf_dad_run(struct inet6_dev *idev)
3984 {
3985         struct inet6_ifaddr *ifp;
3986
3987         read_lock_bh(&idev->lock);
3988         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3989                 spin_lock(&ifp->lock);
3990                 if (ifp->flags & IFA_F_TENTATIVE &&
3991                     ifp->state == INET6_IFADDR_STATE_DAD)
3992                         addrconf_dad_kick(ifp);
3993                 spin_unlock(&ifp->lock);
3994         }
3995         read_unlock_bh(&idev->lock);
3996 }
3997
3998 #ifdef CONFIG_PROC_FS
3999 struct if6_iter_state {
4000         struct seq_net_private p;
4001         int bucket;
4002         int offset;
4003 };
4004
4005 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4006 {
4007         struct inet6_ifaddr *ifa = NULL;
4008         struct if6_iter_state *state = seq->private;
4009         struct net *net = seq_file_net(seq);
4010         int p = 0;
4011
4012         /* initial bucket if pos is 0 */
4013         if (pos == 0) {
4014                 state->bucket = 0;
4015                 state->offset = 0;
4016         }
4017
4018         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4019                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4020                                          addr_lst) {
4021                         if (!net_eq(dev_net(ifa->idev->dev), net))
4022                                 continue;
4023                         /* sync with offset */
4024                         if (p < state->offset) {
4025                                 p++;
4026                                 continue;
4027                         }
4028                         state->offset++;
4029                         return ifa;
4030                 }
4031
4032                 /* prepare for next bucket */
4033                 state->offset = 0;
4034                 p = 0;
4035         }
4036         return NULL;
4037 }
4038
4039 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4040                                          struct inet6_ifaddr *ifa)
4041 {
4042         struct if6_iter_state *state = seq->private;
4043         struct net *net = seq_file_net(seq);
4044
4045         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4046                 if (!net_eq(dev_net(ifa->idev->dev), net))
4047                         continue;
4048                 state->offset++;
4049                 return ifa;
4050         }
4051
4052         while (++state->bucket < IN6_ADDR_HSIZE) {
4053                 state->offset = 0;
4054                 hlist_for_each_entry_rcu_bh(ifa,
4055                                      &inet6_addr_lst[state->bucket], addr_lst) {
4056                         if (!net_eq(dev_net(ifa->idev->dev), net))
4057                                 continue;
4058                         state->offset++;
4059                         return ifa;
4060                 }
4061         }
4062
4063         return NULL;
4064 }
4065
4066 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4067         __acquires(rcu_bh)
4068 {
4069         rcu_read_lock_bh();
4070         return if6_get_first(seq, *pos);
4071 }
4072
4073 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4074 {
4075         struct inet6_ifaddr *ifa;
4076
4077         ifa = if6_get_next(seq, v);
4078         ++*pos;
4079         return ifa;
4080 }
4081
4082 static void if6_seq_stop(struct seq_file *seq, void *v)
4083         __releases(rcu_bh)
4084 {
4085         rcu_read_unlock_bh();
4086 }
4087
4088 static int if6_seq_show(struct seq_file *seq, void *v)
4089 {
4090         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4091         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4092                    &ifp->addr,
4093                    ifp->idev->dev->ifindex,
4094                    ifp->prefix_len,
4095                    ifp->scope,
4096                    (u8) ifp->flags,
4097                    ifp->idev->dev->name);
4098         return 0;
4099 }
4100
4101 static const struct seq_operations if6_seq_ops = {
4102         .start  = if6_seq_start,
4103         .next   = if6_seq_next,
4104         .show   = if6_seq_show,
4105         .stop   = if6_seq_stop,
4106 };
4107
4108 static int if6_seq_open(struct inode *inode, struct file *file)
4109 {
4110         return seq_open_net(inode, file, &if6_seq_ops,
4111                             sizeof(struct if6_iter_state));
4112 }
4113
4114 static const struct file_operations if6_fops = {
4115         .owner          = THIS_MODULE,
4116         .open           = if6_seq_open,
4117         .read           = seq_read,
4118         .llseek         = seq_lseek,
4119         .release        = seq_release_net,
4120 };
4121
4122 static int __net_init if6_proc_net_init(struct net *net)
4123 {
4124         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4125                 return -ENOMEM;
4126         return 0;
4127 }
4128
4129 static void __net_exit if6_proc_net_exit(struct net *net)
4130 {
4131         remove_proc_entry("if_inet6", net->proc_net);
4132 }
4133
4134 static struct pernet_operations if6_proc_net_ops = {
4135         .init = if6_proc_net_init,
4136         .exit = if6_proc_net_exit,
4137 };
4138
4139 int __init if6_proc_init(void)
4140 {
4141         return register_pernet_subsys(&if6_proc_net_ops);
4142 }
4143
4144 void if6_proc_exit(void)
4145 {
4146         unregister_pernet_subsys(&if6_proc_net_ops);
4147 }
4148 #endif  /* CONFIG_PROC_FS */
4149
4150 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4151 /* Check if address is a home address configured on any interface. */
4152 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4153 {
4154         int ret = 0;
4155         struct inet6_ifaddr *ifp = NULL;
4156         unsigned int hash = inet6_addr_hash(addr);
4157
4158         rcu_read_lock_bh();
4159         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4160                 if (!net_eq(dev_net(ifp->idev->dev), net))
4161                         continue;
4162                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4163                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4164                         ret = 1;
4165                         break;
4166                 }
4167         }
4168         rcu_read_unlock_bh();
4169         return ret;
4170 }
4171 #endif
4172
4173 /*
4174  *      Periodic address status verification
4175  */
4176
4177 static void addrconf_verify_rtnl(void)
4178 {
4179         unsigned long now, next, next_sec, next_sched;
4180         struct inet6_ifaddr *ifp;
4181         int i;
4182
4183         ASSERT_RTNL();
4184
4185         rcu_read_lock_bh();
4186         now = jiffies;
4187         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4188
4189         cancel_delayed_work(&addr_chk_work);
4190
4191         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4192 restart:
4193                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4194                         unsigned long age;
4195
4196                         /* When setting preferred_lft to a value not zero or
4197                          * infinity, while valid_lft is infinity
4198                          * IFA_F_PERMANENT has a non-infinity life time.
4199                          */
4200                         if ((ifp->flags & IFA_F_PERMANENT) &&
4201                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4202                                 continue;
4203
4204                         spin_lock(&ifp->lock);
4205                         /* We try to batch several events at once. */
4206                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4207
4208                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4209                             age >= ifp->valid_lft) {
4210                                 spin_unlock(&ifp->lock);
4211                                 in6_ifa_hold(ifp);
4212                                 ipv6_del_addr(ifp);
4213                                 goto restart;
4214                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4215                                 spin_unlock(&ifp->lock);
4216                                 continue;
4217                         } else if (age >= ifp->prefered_lft) {
4218                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4219                                 int deprecate = 0;
4220
4221                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4222                                         deprecate = 1;
4223                                         ifp->flags |= IFA_F_DEPRECATED;
4224                                 }
4225
4226                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4227                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4228                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4229
4230                                 spin_unlock(&ifp->lock);
4231
4232                                 if (deprecate) {
4233                                         in6_ifa_hold(ifp);
4234
4235                                         ipv6_ifa_notify(0, ifp);
4236                                         in6_ifa_put(ifp);
4237                                         goto restart;
4238                                 }
4239                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4240                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4241                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4242                                         ifp->idev->cnf.dad_transmits *
4243                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4244
4245                                 if (age >= ifp->prefered_lft - regen_advance) {
4246                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4247                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4248                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4249                                         if (!ifp->regen_count && ifpub) {
4250                                                 ifp->regen_count++;
4251                                                 in6_ifa_hold(ifp);
4252                                                 in6_ifa_hold(ifpub);
4253                                                 spin_unlock(&ifp->lock);
4254
4255                                                 spin_lock(&ifpub->lock);
4256                                                 ifpub->regen_count = 0;
4257                                                 spin_unlock(&ifpub->lock);
4258                                                 ipv6_create_tempaddr(ifpub, ifp);
4259                                                 in6_ifa_put(ifpub);
4260                                                 in6_ifa_put(ifp);
4261                                                 goto restart;
4262                                         }
4263                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4264                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4265                                 spin_unlock(&ifp->lock);
4266                         } else {
4267                                 /* ifp->prefered_lft <= ifp->valid_lft */
4268                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4269                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4270                                 spin_unlock(&ifp->lock);
4271                         }
4272                 }
4273         }
4274
4275         next_sec = round_jiffies_up(next);
4276         next_sched = next;
4277
4278         /* If rounded timeout is accurate enough, accept it. */
4279         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4280                 next_sched = next_sec;
4281
4282         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4283         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4284                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4285
4286         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4287               now, next, next_sec, next_sched);
4288         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4289         rcu_read_unlock_bh();
4290 }
4291
4292 static void addrconf_verify_work(struct work_struct *w)
4293 {
4294         rtnl_lock();
4295         addrconf_verify_rtnl();
4296         rtnl_unlock();
4297 }
4298
4299 static void addrconf_verify(void)
4300 {
4301         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4302 }
4303
4304 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4305                                      struct in6_addr **peer_pfx)
4306 {
4307         struct in6_addr *pfx = NULL;
4308
4309         *peer_pfx = NULL;
4310
4311         if (addr)
4312                 pfx = nla_data(addr);
4313
4314         if (local) {
4315                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4316                         *peer_pfx = pfx;
4317                 pfx = nla_data(local);
4318         }
4319
4320         return pfx;
4321 }
4322
4323 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4324         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4325         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4326         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4327         [IFA_FLAGS]             = { .len = sizeof(u32) },
4328 };
4329
4330 static int
4331 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4332 {
4333         struct net *net = sock_net(skb->sk);
4334         struct ifaddrmsg *ifm;
4335         struct nlattr *tb[IFA_MAX+1];
4336         struct in6_addr *pfx, *peer_pfx;
4337         u32 ifa_flags;
4338         int err;
4339
4340         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4341         if (err < 0)
4342                 return err;
4343
4344         ifm = nlmsg_data(nlh);
4345         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4346         if (!pfx)
4347                 return -EINVAL;
4348
4349         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4350
4351         /* We ignore other flags so far. */
4352         ifa_flags &= IFA_F_MANAGETEMPADDR;
4353
4354         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4355                               ifm->ifa_prefixlen);
4356 }
4357
4358 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4359                              u32 prefered_lft, u32 valid_lft)
4360 {
4361         u32 flags;
4362         clock_t expires;
4363         unsigned long timeout;
4364         bool was_managetempaddr;
4365         bool had_prefixroute;
4366
4367         ASSERT_RTNL();
4368
4369         if (!valid_lft || (prefered_lft > valid_lft))
4370                 return -EINVAL;
4371
4372         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4373             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4374                 return -EINVAL;
4375
4376         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4377         if (addrconf_finite_timeout(timeout)) {
4378                 expires = jiffies_to_clock_t(timeout * HZ);
4379                 valid_lft = timeout;
4380                 flags = RTF_EXPIRES;
4381         } else {
4382                 expires = 0;
4383                 flags = 0;
4384                 ifa_flags |= IFA_F_PERMANENT;
4385         }
4386
4387         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4388         if (addrconf_finite_timeout(timeout)) {
4389                 if (timeout == 0)
4390                         ifa_flags |= IFA_F_DEPRECATED;
4391                 prefered_lft = timeout;
4392         }
4393
4394         spin_lock_bh(&ifp->lock);
4395         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4396         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4397                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4398         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4399                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4400                         IFA_F_NOPREFIXROUTE);
4401         ifp->flags |= ifa_flags;
4402         ifp->tstamp = jiffies;
4403         ifp->valid_lft = valid_lft;
4404         ifp->prefered_lft = prefered_lft;
4405
4406         spin_unlock_bh(&ifp->lock);
4407         if (!(ifp->flags&IFA_F_TENTATIVE))
4408                 ipv6_ifa_notify(0, ifp);
4409
4410         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4411                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4412                                       expires, flags);
4413         } else if (had_prefixroute) {
4414                 enum cleanup_prefix_rt_t action;
4415                 unsigned long rt_expires;
4416
4417                 write_lock_bh(&ifp->idev->lock);
4418                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4419                 write_unlock_bh(&ifp->idev->lock);
4420
4421                 if (action != CLEANUP_PREFIX_RT_NOP) {
4422                         cleanup_prefix_route(ifp, rt_expires,
4423                                 action == CLEANUP_PREFIX_RT_DEL);
4424                 }
4425         }
4426
4427         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4428                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4429                         valid_lft = prefered_lft = 0;
4430                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4431                                  !was_managetempaddr, jiffies);
4432         }
4433
4434         addrconf_verify_rtnl();
4435
4436         return 0;
4437 }
4438
4439 static int
4440 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4441 {
4442         struct net *net = sock_net(skb->sk);
4443         struct ifaddrmsg *ifm;
4444         struct nlattr *tb[IFA_MAX+1];
4445         struct in6_addr *pfx, *peer_pfx;
4446         struct inet6_ifaddr *ifa;
4447         struct net_device *dev;
4448         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4449         u32 ifa_flags;
4450         int err;
4451
4452         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4453         if (err < 0)
4454                 return err;
4455
4456         ifm = nlmsg_data(nlh);
4457         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4458         if (!pfx)
4459                 return -EINVAL;
4460
4461         if (tb[IFA_CACHEINFO]) {
4462                 struct ifa_cacheinfo *ci;
4463
4464                 ci = nla_data(tb[IFA_CACHEINFO]);
4465                 valid_lft = ci->ifa_valid;
4466                 preferred_lft = ci->ifa_prefered;
4467         } else {
4468                 preferred_lft = INFINITY_LIFE_TIME;
4469                 valid_lft = INFINITY_LIFE_TIME;
4470         }
4471
4472         dev =  __dev_get_by_index(net, ifm->ifa_index);
4473         if (!dev)
4474                 return -ENODEV;
4475
4476         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4477
4478         /* We ignore other flags so far. */
4479         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4480                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4481
4482         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4483         if (!ifa) {
4484                 /*
4485                  * It would be best to check for !NLM_F_CREATE here but
4486                  * userspace already relies on not having to provide this.
4487                  */
4488                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4489                                       ifm->ifa_prefixlen, ifa_flags,
4490                                       preferred_lft, valid_lft);
4491         }
4492
4493         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4494             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4495                 err = -EEXIST;
4496         else
4497                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4498
4499         in6_ifa_put(ifa);
4500
4501         return err;
4502 }
4503
4504 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4505                           u8 scope, int ifindex)
4506 {
4507         struct ifaddrmsg *ifm;
4508
4509         ifm = nlmsg_data(nlh);
4510         ifm->ifa_family = AF_INET6;
4511         ifm->ifa_prefixlen = prefixlen;
4512         ifm->ifa_flags = flags;
4513         ifm->ifa_scope = scope;
4514         ifm->ifa_index = ifindex;
4515 }
4516
4517 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4518                          unsigned long tstamp, u32 preferred, u32 valid)
4519 {
4520         struct ifa_cacheinfo ci;
4521
4522         ci.cstamp = cstamp_delta(cstamp);
4523         ci.tstamp = cstamp_delta(tstamp);
4524         ci.ifa_prefered = preferred;
4525         ci.ifa_valid = valid;
4526
4527         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4528 }
4529
4530 static inline int rt_scope(int ifa_scope)
4531 {
4532         if (ifa_scope & IFA_HOST)
4533                 return RT_SCOPE_HOST;
4534         else if (ifa_scope & IFA_LINK)
4535                 return RT_SCOPE_LINK;
4536         else if (ifa_scope & IFA_SITE)
4537                 return RT_SCOPE_SITE;
4538         else
4539                 return RT_SCOPE_UNIVERSE;
4540 }
4541
4542 static inline int inet6_ifaddr_msgsize(void)
4543 {
4544         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4545                + nla_total_size(16) /* IFA_LOCAL */
4546                + nla_total_size(16) /* IFA_ADDRESS */
4547                + nla_total_size(sizeof(struct ifa_cacheinfo))
4548                + nla_total_size(4)  /* IFA_FLAGS */;
4549 }
4550
4551 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4552                              u32 portid, u32 seq, int event, unsigned int flags)
4553 {
4554         struct nlmsghdr  *nlh;
4555         u32 preferred, valid;
4556
4557         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4558         if (!nlh)
4559                 return -EMSGSIZE;
4560
4561         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4562                       ifa->idev->dev->ifindex);
4563
4564         if (!((ifa->flags&IFA_F_PERMANENT) &&
4565               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4566                 preferred = ifa->prefered_lft;
4567                 valid = ifa->valid_lft;
4568                 if (preferred != INFINITY_LIFE_TIME) {
4569                         long tval = (jiffies - ifa->tstamp)/HZ;
4570                         if (preferred > tval)
4571                                 preferred -= tval;
4572                         else
4573                                 preferred = 0;
4574                         if (valid != INFINITY_LIFE_TIME) {
4575                                 if (valid > tval)
4576                                         valid -= tval;
4577                                 else
4578                                         valid = 0;
4579                         }
4580                 }
4581         } else {
4582                 preferred = INFINITY_LIFE_TIME;
4583                 valid = INFINITY_LIFE_TIME;
4584         }
4585
4586         if (!ipv6_addr_any(&ifa->peer_addr)) {
4587                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4588                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4589                         goto error;
4590         } else
4591                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4592                         goto error;
4593
4594         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4595                 goto error;
4596
4597         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4598                 goto error;
4599
4600         nlmsg_end(skb, nlh);
4601         return 0;
4602
4603 error:
4604         nlmsg_cancel(skb, nlh);
4605         return -EMSGSIZE;
4606 }
4607
4608 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4609                                 u32 portid, u32 seq, int event, u16 flags)
4610 {
4611         struct nlmsghdr  *nlh;
4612         u8 scope = RT_SCOPE_UNIVERSE;
4613         int ifindex = ifmca->idev->dev->ifindex;
4614
4615         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4616                 scope = RT_SCOPE_SITE;
4617
4618         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4619         if (!nlh)
4620                 return -EMSGSIZE;
4621
4622         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4623         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4624             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4625                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4626                 nlmsg_cancel(skb, nlh);
4627                 return -EMSGSIZE;
4628         }
4629
4630         nlmsg_end(skb, nlh);
4631         return 0;
4632 }
4633
4634 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4635                                 u32 portid, u32 seq, int event, unsigned int flags)
4636 {
4637         struct nlmsghdr  *nlh;
4638         u8 scope = RT_SCOPE_UNIVERSE;
4639         int ifindex = ifaca->aca_idev->dev->ifindex;
4640
4641         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4642                 scope = RT_SCOPE_SITE;
4643
4644         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4645         if (!nlh)
4646                 return -EMSGSIZE;
4647
4648         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4649         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4650             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4651                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4652                 nlmsg_cancel(skb, nlh);
4653                 return -EMSGSIZE;
4654         }
4655
4656         nlmsg_end(skb, nlh);
4657         return 0;
4658 }
4659
4660 enum addr_type_t {
4661         UNICAST_ADDR,
4662         MULTICAST_ADDR,
4663         ANYCAST_ADDR,
4664 };
4665
4666 /* called with rcu_read_lock() */
4667 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4668                           struct netlink_callback *cb, enum addr_type_t type,
4669                           int s_ip_idx, int *p_ip_idx)
4670 {
4671         struct ifmcaddr6 *ifmca;
4672         struct ifacaddr6 *ifaca;
4673         int err = 1;
4674         int ip_idx = *p_ip_idx;
4675
4676         read_lock_bh(&idev->lock);
4677         switch (type) {
4678         case UNICAST_ADDR: {
4679                 struct inet6_ifaddr *ifa;
4680
4681                 /* unicast address incl. temp addr */
4682                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4683                         if (++ip_idx < s_ip_idx)
4684                                 continue;
4685                         err = inet6_fill_ifaddr(skb, ifa,
4686                                                 NETLINK_CB(cb->skb).portid,
4687                                                 cb->nlh->nlmsg_seq,
4688                                                 RTM_NEWADDR,
4689                                                 NLM_F_MULTI);
4690                         if (err < 0)
4691                                 break;
4692                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4693                 }
4694                 break;
4695         }
4696         case MULTICAST_ADDR:
4697                 /* multicast address */
4698                 for (ifmca = idev->mc_list; ifmca;
4699                      ifmca = ifmca->next, ip_idx++) {
4700                         if (ip_idx < s_ip_idx)
4701                                 continue;
4702                         err = inet6_fill_ifmcaddr(skb, ifmca,
4703                                                   NETLINK_CB(cb->skb).portid,
4704                                                   cb->nlh->nlmsg_seq,
4705                                                   RTM_GETMULTICAST,
4706                                                   NLM_F_MULTI);
4707                         if (err < 0)
4708                                 break;
4709                 }
4710                 break;
4711         case ANYCAST_ADDR:
4712                 /* anycast address */
4713                 for (ifaca = idev->ac_list; ifaca;
4714                      ifaca = ifaca->aca_next, ip_idx++) {
4715                         if (ip_idx < s_ip_idx)
4716                                 continue;
4717                         err = inet6_fill_ifacaddr(skb, ifaca,
4718                                                   NETLINK_CB(cb->skb).portid,
4719                                                   cb->nlh->nlmsg_seq,
4720                                                   RTM_GETANYCAST,
4721                                                   NLM_F_MULTI);
4722                         if (err < 0)
4723                                 break;
4724                 }
4725                 break;
4726         default:
4727                 break;
4728         }
4729         read_unlock_bh(&idev->lock);
4730         *p_ip_idx = ip_idx;
4731         return err;
4732 }
4733
4734 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4735                            enum addr_type_t type)
4736 {
4737         struct net *net = sock_net(skb->sk);
4738         int h, s_h;
4739         int idx, ip_idx;
4740         int s_idx, s_ip_idx;
4741         struct net_device *dev;
4742         struct inet6_dev *idev;
4743         struct hlist_head *head;
4744
4745         s_h = cb->args[0];
4746         s_idx = idx = cb->args[1];
4747         s_ip_idx = ip_idx = cb->args[2];
4748
4749         rcu_read_lock();
4750         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4751         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4752                 idx = 0;
4753                 head = &net->dev_index_head[h];
4754                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4755                         if (idx < s_idx)
4756                                 goto cont;
4757                         if (h > s_h || idx > s_idx)
4758                                 s_ip_idx = 0;
4759                         ip_idx = 0;
4760                         idev = __in6_dev_get(dev);
4761                         if (!idev)
4762                                 goto cont;
4763
4764                         if (in6_dump_addrs(idev, skb, cb, type,
4765                                            s_ip_idx, &ip_idx) < 0)
4766                                 goto done;
4767 cont:
4768                         idx++;
4769                 }
4770         }
4771 done:
4772         rcu_read_unlock();
4773         cb->args[0] = h;
4774         cb->args[1] = idx;
4775         cb->args[2] = ip_idx;
4776
4777         return skb->len;
4778 }
4779
4780 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4781 {
4782         enum addr_type_t type = UNICAST_ADDR;
4783
4784         return inet6_dump_addr(skb, cb, type);
4785 }
4786
4787 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4788 {
4789         enum addr_type_t type = MULTICAST_ADDR;
4790
4791         return inet6_dump_addr(skb, cb, type);
4792 }
4793
4794
4795 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4796 {
4797         enum addr_type_t type = ANYCAST_ADDR;
4798
4799         return inet6_dump_addr(skb, cb, type);
4800 }
4801
4802 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4803 {
4804         struct net *net = sock_net(in_skb->sk);
4805         struct ifaddrmsg *ifm;
4806         struct nlattr *tb[IFA_MAX+1];
4807         struct in6_addr *addr = NULL, *peer;
4808         struct net_device *dev = NULL;
4809         struct inet6_ifaddr *ifa;
4810         struct sk_buff *skb;
4811         int err;
4812
4813         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4814         if (err < 0)
4815                 goto errout;
4816
4817         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4818         if (!addr) {
4819                 err = -EINVAL;
4820                 goto errout;
4821         }
4822
4823         ifm = nlmsg_data(nlh);
4824         if (ifm->ifa_index)
4825                 dev = __dev_get_by_index(net, ifm->ifa_index);
4826
4827         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4828         if (!ifa) {
4829                 err = -EADDRNOTAVAIL;
4830                 goto errout;
4831         }
4832
4833         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4834         if (!skb) {
4835                 err = -ENOBUFS;
4836                 goto errout_ifa;
4837         }
4838
4839         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4840                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4841         if (err < 0) {
4842                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4843                 WARN_ON(err == -EMSGSIZE);
4844                 kfree_skb(skb);
4845                 goto errout_ifa;
4846         }
4847         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4848 errout_ifa:
4849         in6_ifa_put(ifa);
4850 errout:
4851         return err;
4852 }
4853
4854 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4855 {
4856         struct sk_buff *skb;
4857         struct net *net = dev_net(ifa->idev->dev);
4858         int err = -ENOBUFS;
4859
4860         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4861         if (!skb)
4862                 goto errout;
4863
4864         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4865         if (err < 0) {
4866                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4867                 WARN_ON(err == -EMSGSIZE);
4868                 kfree_skb(skb);
4869                 goto errout;
4870         }
4871         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4872         return;
4873 errout:
4874         if (err < 0)
4875                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4876 }
4877
4878 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4879                                 __s32 *array, int bytes)
4880 {
4881         BUG_ON(bytes < (DEVCONF_MAX * 4));
4882
4883         memset(array, 0, bytes);
4884         array[DEVCONF_FORWARDING] = cnf->forwarding;
4885         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4886         array[DEVCONF_MTU6] = cnf->mtu6;
4887         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4888         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4889         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4890         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4891         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4892         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4893                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4894         array[DEVCONF_RTR_SOLICIT_DELAY] =
4895                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4896         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4897         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4898                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4899         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4900                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4901         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4902         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4903         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4904         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4905         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4906         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4907         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4908         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4909         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4910 #ifdef CONFIG_IPV6_ROUTER_PREF
4911         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4912         array[DEVCONF_RTR_PROBE_INTERVAL] =
4913                 jiffies_to_msecs(cnf->rtr_probe_interval);
4914 #ifdef CONFIG_IPV6_ROUTE_INFO
4915         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4916 #endif
4917 #endif
4918         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4919         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4920 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4921         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4922         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4923 #endif
4924 #ifdef CONFIG_IPV6_MROUTE
4925         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4926 #endif
4927         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4928         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4929         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4930         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4931         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4932         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4933         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4934         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4935         /* we omit DEVCONF_STABLE_SECRET for now */
4936         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4937         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4938         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4939         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4940 }
4941
4942 static inline size_t inet6_ifla6_size(void)
4943 {
4944         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4945              + nla_total_size(sizeof(struct ifla_cacheinfo))
4946              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4947              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4948              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4949              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4950 }
4951
4952 static inline size_t inet6_if_nlmsg_size(void)
4953 {
4954         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4955                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4956                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4957                + nla_total_size(4) /* IFLA_MTU */
4958                + nla_total_size(4) /* IFLA_LINK */
4959                + nla_total_size(1) /* IFLA_OPERSTATE */
4960                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4961 }
4962
4963 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4964                                       int items, int bytes)
4965 {
4966         int i;
4967         int pad = bytes - sizeof(u64) * items;
4968         BUG_ON(pad < 0);
4969
4970         /* Use put_unaligned() because stats may not be aligned for u64. */
4971         put_unaligned(items, &stats[0]);
4972         for (i = 1; i < items; i++)
4973                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4974
4975         memset(&stats[items], 0, pad);
4976 }
4977
4978 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4979                                         int bytes, size_t syncpoff)
4980 {
4981         int i, c;
4982         u64 buff[IPSTATS_MIB_MAX];
4983         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4984
4985         BUG_ON(pad < 0);
4986
4987         memset(buff, 0, sizeof(buff));
4988         buff[0] = IPSTATS_MIB_MAX;
4989
4990         for_each_possible_cpu(c) {
4991                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4992                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4993         }
4994
4995         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4996         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4997 }
4998
4999 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5000                              int bytes)
5001 {
5002         switch (attrtype) {
5003         case IFLA_INET6_STATS:
5004                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5005                                      offsetof(struct ipstats_mib, syncp));
5006                 break;
5007         case IFLA_INET6_ICMP6STATS:
5008                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
5009                 break;
5010         }
5011 }
5012
5013 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5014                                   u32 ext_filter_mask)
5015 {
5016         struct nlattr *nla;
5017         struct ifla_cacheinfo ci;
5018
5019         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5020                 goto nla_put_failure;
5021         ci.max_reasm_len = IPV6_MAXPLEN;
5022         ci.tstamp = cstamp_delta(idev->tstamp);
5023         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5024         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5025         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5026                 goto nla_put_failure;
5027         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5028         if (!nla)
5029                 goto nla_put_failure;
5030         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5031
5032         /* XXX - MC not implemented */
5033
5034         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5035                 return 0;
5036
5037         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5038         if (!nla)
5039                 goto nla_put_failure;
5040         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5041
5042         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5043         if (!nla)
5044                 goto nla_put_failure;
5045         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5046
5047         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5048         if (!nla)
5049                 goto nla_put_failure;
5050
5051         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5052                 goto nla_put_failure;
5053
5054         read_lock_bh(&idev->lock);
5055         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5056         read_unlock_bh(&idev->lock);
5057
5058         return 0;
5059
5060 nla_put_failure:
5061         return -EMSGSIZE;
5062 }
5063
5064 static size_t inet6_get_link_af_size(const struct net_device *dev,
5065                                      u32 ext_filter_mask)
5066 {
5067         if (!__in6_dev_get(dev))
5068                 return 0;
5069
5070         return inet6_ifla6_size();
5071 }
5072
5073 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5074                               u32 ext_filter_mask)
5075 {
5076         struct inet6_dev *idev = __in6_dev_get(dev);
5077
5078         if (!idev)
5079                 return -ENODATA;
5080
5081         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5082                 return -EMSGSIZE;
5083
5084         return 0;
5085 }
5086
5087 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5088 {
5089         struct inet6_ifaddr *ifp;
5090         struct net_device *dev = idev->dev;
5091         bool clear_token, update_rs = false;
5092         struct in6_addr ll_addr;
5093
5094         ASSERT_RTNL();
5095
5096         if (!token)
5097                 return -EINVAL;
5098         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5099                 return -EINVAL;
5100         if (!ipv6_accept_ra(idev))
5101                 return -EINVAL;
5102         if (idev->cnf.rtr_solicits <= 0)
5103                 return -EINVAL;
5104
5105         write_lock_bh(&idev->lock);
5106
5107         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5108         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5109
5110         write_unlock_bh(&idev->lock);
5111
5112         clear_token = ipv6_addr_any(token);
5113         if (clear_token)
5114                 goto update_lft;
5115
5116         if (!idev->dead && (idev->if_flags & IF_READY) &&
5117             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5118                              IFA_F_OPTIMISTIC)) {
5119                 /* If we're not ready, then normal ifup will take care
5120                  * of this. Otherwise, we need to request our rs here.
5121                  */
5122                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5123                 update_rs = true;
5124         }
5125
5126 update_lft:
5127         write_lock_bh(&idev->lock);
5128
5129         if (update_rs) {
5130                 idev->if_flags |= IF_RS_SENT;
5131                 idev->rs_probes = 1;
5132                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5133         }
5134
5135         /* Well, that's kinda nasty ... */
5136         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5137                 spin_lock(&ifp->lock);
5138                 if (ifp->tokenized) {
5139                         ifp->valid_lft = 0;
5140                         ifp->prefered_lft = 0;
5141                 }
5142                 spin_unlock(&ifp->lock);
5143         }
5144
5145         write_unlock_bh(&idev->lock);
5146         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5147         addrconf_verify_rtnl();
5148         return 0;
5149 }
5150
5151 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5152         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5153         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5154 };
5155
5156 static int inet6_validate_link_af(const struct net_device *dev,
5157                                   const struct nlattr *nla)
5158 {
5159         struct nlattr *tb[IFLA_INET6_MAX + 1];
5160
5161         if (dev && !__in6_dev_get(dev))
5162                 return -EAFNOSUPPORT;
5163
5164         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5165 }
5166
5167 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5168 {
5169         int err = -EINVAL;
5170         struct inet6_dev *idev = __in6_dev_get(dev);
5171         struct nlattr *tb[IFLA_INET6_MAX + 1];
5172
5173         if (!idev)
5174                 return -EAFNOSUPPORT;
5175
5176         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5177                 BUG();
5178
5179         if (tb[IFLA_INET6_TOKEN]) {
5180                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5181                 if (err)
5182                         return err;
5183         }
5184
5185         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5186                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5187
5188                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5189                     mode != IN6_ADDR_GEN_MODE_NONE &&
5190                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5191                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5192                         return -EINVAL;
5193
5194                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5195                     !idev->cnf.stable_secret.initialized &&
5196                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5197                         return -EINVAL;
5198
5199                 idev->addr_gen_mode = mode;
5200                 err = 0;
5201         }
5202
5203         return err;
5204 }
5205
5206 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5207                              u32 portid, u32 seq, int event, unsigned int flags)
5208 {
5209         struct net_device *dev = idev->dev;
5210         struct ifinfomsg *hdr;
5211         struct nlmsghdr *nlh;
5212         void *protoinfo;
5213
5214         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5215         if (!nlh)
5216                 return -EMSGSIZE;
5217
5218         hdr = nlmsg_data(nlh);
5219         hdr->ifi_family = AF_INET6;
5220         hdr->__ifi_pad = 0;
5221         hdr->ifi_type = dev->type;
5222         hdr->ifi_index = dev->ifindex;
5223         hdr->ifi_flags = dev_get_flags(dev);
5224         hdr->ifi_change = 0;
5225
5226         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5227             (dev->addr_len &&
5228              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5229             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5230             (dev->ifindex != dev_get_iflink(dev) &&
5231              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5232             nla_put_u8(skb, IFLA_OPERSTATE,
5233                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5234                 goto nla_put_failure;
5235         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5236         if (!protoinfo)
5237                 goto nla_put_failure;
5238
5239         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5240                 goto nla_put_failure;
5241
5242         nla_nest_end(skb, protoinfo);
5243         nlmsg_end(skb, nlh);
5244         return 0;
5245
5246 nla_put_failure:
5247         nlmsg_cancel(skb, nlh);
5248         return -EMSGSIZE;
5249 }
5250
5251 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5252 {
5253         struct net *net = sock_net(skb->sk);
5254         int h, s_h;
5255         int idx = 0, s_idx;
5256         struct net_device *dev;
5257         struct inet6_dev *idev;
5258         struct hlist_head *head;
5259
5260         s_h = cb->args[0];
5261         s_idx = cb->args[1];
5262
5263         rcu_read_lock();
5264         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5265                 idx = 0;
5266                 head = &net->dev_index_head[h];
5267                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5268                         if (idx < s_idx)
5269                                 goto cont;
5270                         idev = __in6_dev_get(dev);
5271                         if (!idev)
5272                                 goto cont;
5273                         if (inet6_fill_ifinfo(skb, idev,
5274                                               NETLINK_CB(cb->skb).portid,
5275                                               cb->nlh->nlmsg_seq,
5276                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5277                                 goto out;
5278 cont:
5279                         idx++;
5280                 }
5281         }
5282 out:
5283         rcu_read_unlock();
5284         cb->args[1] = idx;
5285         cb->args[0] = h;
5286
5287         return skb->len;
5288 }
5289
5290 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5291 {
5292         struct sk_buff *skb;
5293         struct net *net = dev_net(idev->dev);
5294         int err = -ENOBUFS;
5295
5296         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5297         if (!skb)
5298                 goto errout;
5299
5300         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5301         if (err < 0) {
5302                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5303                 WARN_ON(err == -EMSGSIZE);
5304                 kfree_skb(skb);
5305                 goto errout;
5306         }
5307         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5308         return;
5309 errout:
5310         if (err < 0)
5311                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5312 }
5313
5314 static inline size_t inet6_prefix_nlmsg_size(void)
5315 {
5316         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5317                + nla_total_size(sizeof(struct in6_addr))
5318                + nla_total_size(sizeof(struct prefix_cacheinfo));
5319 }
5320
5321 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5322                              struct prefix_info *pinfo, u32 portid, u32 seq,
5323                              int event, unsigned int flags)
5324 {
5325         struct prefixmsg *pmsg;
5326         struct nlmsghdr *nlh;
5327         struct prefix_cacheinfo ci;
5328
5329         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5330         if (!nlh)
5331                 return -EMSGSIZE;
5332
5333         pmsg = nlmsg_data(nlh);
5334         pmsg->prefix_family = AF_INET6;
5335         pmsg->prefix_pad1 = 0;
5336         pmsg->prefix_pad2 = 0;
5337         pmsg->prefix_ifindex = idev->dev->ifindex;
5338         pmsg->prefix_len = pinfo->prefix_len;
5339         pmsg->prefix_type = pinfo->type;
5340         pmsg->prefix_pad3 = 0;
5341         pmsg->prefix_flags = 0;
5342         if (pinfo->onlink)
5343                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5344         if (pinfo->autoconf)
5345                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5346
5347         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5348                 goto nla_put_failure;
5349         ci.preferred_time = ntohl(pinfo->prefered);
5350         ci.valid_time = ntohl(pinfo->valid);
5351         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5352                 goto nla_put_failure;
5353         nlmsg_end(skb, nlh);
5354         return 0;
5355
5356 nla_put_failure:
5357         nlmsg_cancel(skb, nlh);
5358         return -EMSGSIZE;
5359 }
5360
5361 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5362                          struct prefix_info *pinfo)
5363 {
5364         struct sk_buff *skb;
5365         struct net *net = dev_net(idev->dev);
5366         int err = -ENOBUFS;
5367
5368         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5369         if (!skb)
5370                 goto errout;
5371
5372         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5373         if (err < 0) {
5374                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5375                 WARN_ON(err == -EMSGSIZE);
5376                 kfree_skb(skb);
5377                 goto errout;
5378         }
5379         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5380         return;
5381 errout:
5382         if (err < 0)
5383                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5384 }
5385
5386 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5387 {
5388         struct net *net = dev_net(ifp->idev->dev);
5389
5390         if (event)
5391                 ASSERT_RTNL();
5392
5393         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5394
5395         switch (event) {
5396         case RTM_NEWADDR:
5397                 /*
5398                  * If the address was optimistic
5399                  * we inserted the route at the start of
5400                  * our DAD process, so we don't need
5401                  * to do it again
5402                  */
5403                 if (!(ifp->rt->rt6i_node))
5404                         ip6_ins_rt(ifp->rt);
5405                 if (ifp->idev->cnf.forwarding)
5406                         addrconf_join_anycast(ifp);
5407                 if (!ipv6_addr_any(&ifp->peer_addr))
5408                         addrconf_prefix_route(&ifp->peer_addr, 128,
5409                                               ifp->idev->dev, 0, 0);
5410                 break;
5411         case RTM_DELADDR:
5412                 if (ifp->idev->cnf.forwarding)
5413                         addrconf_leave_anycast(ifp);
5414                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5415                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5416                         struct rt6_info *rt;
5417
5418                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5419                                                        ifp->idev->dev, 0, 0);
5420                         if (rt)
5421                                 ip6_del_rt(rt);
5422                 }
5423                 if (ifp->rt) {
5424                         dst_hold(&ifp->rt->dst);
5425                         ip6_del_rt(ifp->rt);
5426                 }
5427                 rt_genid_bump_ipv6(net);
5428                 break;
5429         }
5430         atomic_inc(&net->ipv6.dev_addr_genid);
5431 }
5432
5433 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5434 {
5435         rcu_read_lock_bh();
5436         if (likely(ifp->idev->dead == 0))
5437                 __ipv6_ifa_notify(event, ifp);
5438         rcu_read_unlock_bh();
5439 }
5440
5441 #ifdef CONFIG_SYSCTL
5442
5443 static
5444 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5445                            void __user *buffer, size_t *lenp, loff_t *ppos)
5446 {
5447         int *valp = ctl->data;
5448         int val = *valp;
5449         loff_t pos = *ppos;
5450         struct ctl_table lctl;
5451         int ret;
5452
5453         /*
5454          * ctl->data points to idev->cnf.forwarding, we should
5455          * not modify it until we get the rtnl lock.
5456          */
5457         lctl = *ctl;
5458         lctl.data = &val;
5459
5460         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5461
5462         if (write)
5463                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5464         if (ret)
5465                 *ppos = pos;
5466         return ret;
5467 }
5468
5469 static
5470 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5471                               void __user *buffer, size_t *lenp, loff_t *ppos)
5472 {
5473         struct ctl_table lctl;
5474         int min_hl = 1, max_hl = 255;
5475
5476         lctl = *ctl;
5477         lctl.extra1 = &min_hl;
5478         lctl.extra2 = &max_hl;
5479
5480         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5481 }
5482
5483 static
5484 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5485                         void __user *buffer, size_t *lenp, loff_t *ppos)
5486 {
5487         struct inet6_dev *idev = ctl->extra1;
5488         int min_mtu = IPV6_MIN_MTU;
5489         struct ctl_table lctl;
5490
5491         lctl = *ctl;
5492         lctl.extra1 = &min_mtu;
5493         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5494
5495         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5496 }
5497
5498 static void dev_disable_change(struct inet6_dev *idev)
5499 {
5500         struct netdev_notifier_info info;
5501
5502         if (!idev || !idev->dev)
5503                 return;
5504
5505         netdev_notifier_info_init(&info, idev->dev);
5506         if (idev->cnf.disable_ipv6)
5507                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5508         else
5509                 addrconf_notify(NULL, NETDEV_UP, &info);
5510 }
5511
5512 static void addrconf_disable_change(struct net *net, __s32 newf)
5513 {
5514         struct net_device *dev;
5515         struct inet6_dev *idev;
5516
5517         rcu_read_lock();
5518         for_each_netdev_rcu(net, dev) {
5519                 idev = __in6_dev_get(dev);
5520                 if (idev) {
5521                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5522                         idev->cnf.disable_ipv6 = newf;
5523                         if (changed)
5524                                 dev_disable_change(idev);
5525                 }
5526         }
5527         rcu_read_unlock();
5528 }
5529
5530 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5531 {
5532         struct net *net;
5533         int old;
5534
5535         if (!rtnl_trylock())
5536                 return restart_syscall();
5537
5538         net = (struct net *)table->extra2;
5539         old = *p;
5540         *p = newf;
5541
5542         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5543                 rtnl_unlock();
5544                 return 0;
5545         }
5546
5547         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5548                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5549                 addrconf_disable_change(net, newf);
5550         } else if ((!newf) ^ (!old))
5551                 dev_disable_change((struct inet6_dev *)table->extra1);
5552
5553         rtnl_unlock();
5554         return 0;
5555 }
5556
5557 static
5558 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5559                             void __user *buffer, size_t *lenp, loff_t *ppos)
5560 {
5561         int *valp = ctl->data;
5562         int val = *valp;
5563         loff_t pos = *ppos;
5564         struct ctl_table lctl;
5565         int ret;
5566
5567         /*
5568          * ctl->data points to idev->cnf.disable_ipv6, we should
5569          * not modify it until we get the rtnl lock.
5570          */
5571         lctl = *ctl;
5572         lctl.data = &val;
5573
5574         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5575
5576         if (write)
5577                 ret = addrconf_disable_ipv6(ctl, valp, val);
5578         if (ret)
5579                 *ppos = pos;
5580         return ret;
5581 }
5582
5583 static
5584 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5585                               void __user *buffer, size_t *lenp, loff_t *ppos)
5586 {
5587         int *valp = ctl->data;
5588         int ret;
5589         int old, new;
5590
5591         old = *valp;
5592         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5593         new = *valp;
5594
5595         if (write && old != new) {
5596                 struct net *net = ctl->extra2;
5597
5598                 if (!rtnl_trylock())
5599                         return restart_syscall();
5600
5601                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5602                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5603                                                      NETCONFA_IFINDEX_DEFAULT,
5604                                                      net->ipv6.devconf_dflt);
5605                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5606                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5607                                                      NETCONFA_IFINDEX_ALL,
5608                                                      net->ipv6.devconf_all);
5609                 else {
5610                         struct inet6_dev *idev = ctl->extra1;
5611
5612                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5613                                                      idev->dev->ifindex,
5614                                                      &idev->cnf);
5615                 }
5616                 rtnl_unlock();
5617         }
5618
5619         return ret;
5620 }
5621
5622 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5623                                          void __user *buffer, size_t *lenp,
5624                                          loff_t *ppos)
5625 {
5626         int err;
5627         struct in6_addr addr;
5628         char str[IPV6_MAX_STRLEN];
5629         struct ctl_table lctl = *ctl;
5630         struct net *net = ctl->extra2;
5631         struct ipv6_stable_secret *secret = ctl->data;
5632
5633         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5634                 return -EIO;
5635
5636         lctl.maxlen = IPV6_MAX_STRLEN;
5637         lctl.data = str;
5638
5639         if (!rtnl_trylock())
5640                 return restart_syscall();
5641
5642         if (!write && !secret->initialized) {
5643                 err = -EIO;
5644                 goto out;
5645         }
5646
5647         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5648         if (err >= sizeof(str)) {
5649                 err = -EIO;
5650                 goto out;
5651         }
5652
5653         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5654         if (err || !write)
5655                 goto out;
5656
5657         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5658                 err = -EIO;
5659                 goto out;
5660         }
5661
5662         secret->initialized = true;
5663         secret->secret = addr;
5664
5665         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5666                 struct net_device *dev;
5667
5668                 for_each_netdev(net, dev) {
5669                         struct inet6_dev *idev = __in6_dev_get(dev);
5670
5671                         if (idev) {
5672                                 idev->addr_gen_mode =
5673                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5674                         }
5675                 }
5676         } else {
5677                 struct inet6_dev *idev = ctl->extra1;
5678
5679                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5680         }
5681
5682 out:
5683         rtnl_unlock();
5684
5685         return err;
5686 }
5687
5688 static
5689 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5690                                                 int write,
5691                                                 void __user *buffer,
5692                                                 size_t *lenp,
5693                                                 loff_t *ppos)
5694 {
5695         int *valp = ctl->data;
5696         int val = *valp;
5697         loff_t pos = *ppos;
5698         struct ctl_table lctl;
5699         int ret;
5700
5701         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5702          * we should not modify it until we get the rtnl lock.
5703          */
5704         lctl = *ctl;
5705         lctl.data = &val;
5706
5707         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5708
5709         if (write)
5710                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5711         if (ret)
5712                 *ppos = pos;
5713         return ret;
5714 }
5715
5716 static const struct ctl_table addrconf_sysctl[] = {
5717         {
5718                 .procname       = "forwarding",
5719                 .data           = &ipv6_devconf.forwarding,
5720                 .maxlen         = sizeof(int),
5721                 .mode           = 0644,
5722                 .proc_handler   = addrconf_sysctl_forward,
5723         },
5724         {
5725                 .procname       = "hop_limit",
5726                 .data           = &ipv6_devconf.hop_limit,
5727                 .maxlen         = sizeof(int),
5728                 .mode           = 0644,
5729                 .proc_handler   = addrconf_sysctl_hop_limit,
5730         },
5731         {
5732                 .procname       = "mtu",
5733                 .data           = &ipv6_devconf.mtu6,
5734                 .maxlen         = sizeof(int),
5735                 .mode           = 0644,
5736                 .proc_handler   = addrconf_sysctl_mtu,
5737         },
5738         {
5739                 .procname       = "accept_ra",
5740                 .data           = &ipv6_devconf.accept_ra,
5741                 .maxlen         = sizeof(int),
5742                 .mode           = 0644,
5743                 .proc_handler   = proc_dointvec,
5744         },
5745         {
5746                 .procname       = "accept_redirects",
5747                 .data           = &ipv6_devconf.accept_redirects,
5748                 .maxlen         = sizeof(int),
5749                 .mode           = 0644,
5750                 .proc_handler   = proc_dointvec,
5751         },
5752         {
5753                 .procname       = "autoconf",
5754                 .data           = &ipv6_devconf.autoconf,
5755                 .maxlen         = sizeof(int),
5756                 .mode           = 0644,
5757                 .proc_handler   = proc_dointvec,
5758         },
5759         {
5760                 .procname       = "dad_transmits",
5761                 .data           = &ipv6_devconf.dad_transmits,
5762                 .maxlen         = sizeof(int),
5763                 .mode           = 0644,
5764                 .proc_handler   = proc_dointvec,
5765         },
5766         {
5767                 .procname       = "router_solicitations",
5768                 .data           = &ipv6_devconf.rtr_solicits,
5769                 .maxlen         = sizeof(int),
5770                 .mode           = 0644,
5771                 .proc_handler   = proc_dointvec,
5772         },
5773         {
5774                 .procname       = "router_solicitation_interval",
5775                 .data           = &ipv6_devconf.rtr_solicit_interval,
5776                 .maxlen         = sizeof(int),
5777                 .mode           = 0644,
5778                 .proc_handler   = proc_dointvec_jiffies,
5779         },
5780         {
5781                 .procname       = "router_solicitation_delay",
5782                 .data           = &ipv6_devconf.rtr_solicit_delay,
5783                 .maxlen         = sizeof(int),
5784                 .mode           = 0644,
5785                 .proc_handler   = proc_dointvec_jiffies,
5786         },
5787         {
5788                 .procname       = "force_mld_version",
5789                 .data           = &ipv6_devconf.force_mld_version,
5790                 .maxlen         = sizeof(int),
5791                 .mode           = 0644,
5792                 .proc_handler   = proc_dointvec,
5793         },
5794         {
5795                 .procname       = "mldv1_unsolicited_report_interval",
5796                 .data           =
5797                         &ipv6_devconf.mldv1_unsolicited_report_interval,
5798                 .maxlen         = sizeof(int),
5799                 .mode           = 0644,
5800                 .proc_handler   = proc_dointvec_ms_jiffies,
5801         },
5802         {
5803                 .procname       = "mldv2_unsolicited_report_interval",
5804                 .data           =
5805                         &ipv6_devconf.mldv2_unsolicited_report_interval,
5806                 .maxlen         = sizeof(int),
5807                 .mode           = 0644,
5808                 .proc_handler   = proc_dointvec_ms_jiffies,
5809         },
5810         {
5811                 .procname       = "use_tempaddr",
5812                 .data           = &ipv6_devconf.use_tempaddr,
5813                 .maxlen         = sizeof(int),
5814                 .mode           = 0644,
5815                 .proc_handler   = proc_dointvec,
5816         },
5817         {
5818                 .procname       = "temp_valid_lft",
5819                 .data           = &ipv6_devconf.temp_valid_lft,
5820                 .maxlen         = sizeof(int),
5821                 .mode           = 0644,
5822                 .proc_handler   = proc_dointvec,
5823         },
5824         {
5825                 .procname       = "temp_prefered_lft",
5826                 .data           = &ipv6_devconf.temp_prefered_lft,
5827                 .maxlen         = sizeof(int),
5828                 .mode           = 0644,
5829                 .proc_handler   = proc_dointvec,
5830         },
5831         {
5832                 .procname       = "regen_max_retry",
5833                 .data           = &ipv6_devconf.regen_max_retry,
5834                 .maxlen         = sizeof(int),
5835                 .mode           = 0644,
5836                 .proc_handler   = proc_dointvec,
5837         },
5838         {
5839                 .procname       = "max_desync_factor",
5840                 .data           = &ipv6_devconf.max_desync_factor,
5841                 .maxlen         = sizeof(int),
5842                 .mode           = 0644,
5843                 .proc_handler   = proc_dointvec,
5844         },
5845         {
5846                 .procname       = "max_addresses",
5847                 .data           = &ipv6_devconf.max_addresses,
5848                 .maxlen         = sizeof(int),
5849                 .mode           = 0644,
5850                 .proc_handler   = proc_dointvec,
5851         },
5852         {
5853                 .procname       = "accept_ra_defrtr",
5854                 .data           = &ipv6_devconf.accept_ra_defrtr,
5855                 .maxlen         = sizeof(int),
5856                 .mode           = 0644,
5857                 .proc_handler   = proc_dointvec,
5858         },
5859         {
5860                 .procname       = "accept_ra_min_hop_limit",
5861                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5862                 .maxlen         = sizeof(int),
5863                 .mode           = 0644,
5864                 .proc_handler   = proc_dointvec,
5865         },
5866         {
5867                 .procname       = "accept_ra_pinfo",
5868                 .data           = &ipv6_devconf.accept_ra_pinfo,
5869                 .maxlen         = sizeof(int),
5870                 .mode           = 0644,
5871                 .proc_handler   = proc_dointvec,
5872         },
5873 #ifdef CONFIG_IPV6_ROUTER_PREF
5874         {
5875                 .procname       = "accept_ra_rtr_pref",
5876                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
5877                 .maxlen         = sizeof(int),
5878                 .mode           = 0644,
5879                 .proc_handler   = proc_dointvec,
5880         },
5881         {
5882                 .procname       = "router_probe_interval",
5883                 .data           = &ipv6_devconf.rtr_probe_interval,
5884                 .maxlen         = sizeof(int),
5885                 .mode           = 0644,
5886                 .proc_handler   = proc_dointvec_jiffies,
5887         },
5888 #ifdef CONFIG_IPV6_ROUTE_INFO
5889         {
5890                 .procname       = "accept_ra_rt_info_max_plen",
5891                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5892                 .maxlen         = sizeof(int),
5893                 .mode           = 0644,
5894                 .proc_handler   = proc_dointvec,
5895         },
5896 #endif
5897 #endif
5898         {
5899                 .procname       = "proxy_ndp",
5900                 .data           = &ipv6_devconf.proxy_ndp,
5901                 .maxlen         = sizeof(int),
5902                 .mode           = 0644,
5903                 .proc_handler   = addrconf_sysctl_proxy_ndp,
5904         },
5905         {
5906                 .procname       = "accept_source_route",
5907                 .data           = &ipv6_devconf.accept_source_route,
5908                 .maxlen         = sizeof(int),
5909                 .mode           = 0644,
5910                 .proc_handler   = proc_dointvec,
5911         },
5912 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5913         {
5914                 .procname       = "optimistic_dad",
5915                 .data           = &ipv6_devconf.optimistic_dad,
5916                 .maxlen         = sizeof(int),
5917                 .mode           = 0644,
5918                 .proc_handler   = proc_dointvec,
5919         },
5920         {
5921                 .procname       = "use_optimistic",
5922                 .data           = &ipv6_devconf.use_optimistic,
5923                 .maxlen         = sizeof(int),
5924                 .mode           = 0644,
5925                 .proc_handler   = proc_dointvec,
5926         },
5927 #endif
5928 #ifdef CONFIG_IPV6_MROUTE
5929         {
5930                 .procname       = "mc_forwarding",
5931                 .data           = &ipv6_devconf.mc_forwarding,
5932                 .maxlen         = sizeof(int),
5933                 .mode           = 0444,
5934                 .proc_handler   = proc_dointvec,
5935         },
5936 #endif
5937         {
5938                 .procname       = "disable_ipv6",
5939                 .data           = &ipv6_devconf.disable_ipv6,
5940                 .maxlen         = sizeof(int),
5941                 .mode           = 0644,
5942                 .proc_handler   = addrconf_sysctl_disable,
5943         },
5944         {
5945                 .procname       = "accept_dad",
5946                 .data           = &ipv6_devconf.accept_dad,
5947                 .maxlen         = sizeof(int),
5948                 .mode           = 0644,
5949                 .proc_handler   = proc_dointvec,
5950         },
5951         {
5952                 .procname       = "force_tllao",
5953                 .data           = &ipv6_devconf.force_tllao,
5954                 .maxlen         = sizeof(int),
5955                 .mode           = 0644,
5956                 .proc_handler   = proc_dointvec
5957         },
5958         {
5959                 .procname       = "ndisc_notify",
5960                 .data           = &ipv6_devconf.ndisc_notify,
5961                 .maxlen         = sizeof(int),
5962                 .mode           = 0644,
5963                 .proc_handler   = proc_dointvec
5964         },
5965         {
5966                 .procname       = "suppress_frag_ndisc",
5967                 .data           = &ipv6_devconf.suppress_frag_ndisc,
5968                 .maxlen         = sizeof(int),
5969                 .mode           = 0644,
5970                 .proc_handler   = proc_dointvec
5971         },
5972         {
5973                 .procname       = "accept_ra_from_local",
5974                 .data           = &ipv6_devconf.accept_ra_from_local,
5975                 .maxlen         = sizeof(int),
5976                 .mode           = 0644,
5977                 .proc_handler   = proc_dointvec,
5978         },
5979         {
5980                 .procname       = "accept_ra_mtu",
5981                 .data           = &ipv6_devconf.accept_ra_mtu,
5982                 .maxlen         = sizeof(int),
5983                 .mode           = 0644,
5984                 .proc_handler   = proc_dointvec,
5985         },
5986         {
5987                 .procname       = "stable_secret",
5988                 .data           = &ipv6_devconf.stable_secret,
5989                 .maxlen         = IPV6_MAX_STRLEN,
5990                 .mode           = 0600,
5991                 .proc_handler   = addrconf_sysctl_stable_secret,
5992         },
5993         {
5994                 .procname       = "use_oif_addrs_only",
5995                 .data           = &ipv6_devconf.use_oif_addrs_only,
5996                 .maxlen         = sizeof(int),
5997                 .mode           = 0644,
5998                 .proc_handler   = proc_dointvec,
5999         },
6000         {
6001                 .procname       = "ignore_routes_with_linkdown",
6002                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6003                 .maxlen         = sizeof(int),
6004                 .mode           = 0644,
6005                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6006         },
6007         {
6008                 .procname       = "drop_unicast_in_l2_multicast",
6009                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6010                 .maxlen         = sizeof(int),
6011                 .mode           = 0644,
6012                 .proc_handler   = proc_dointvec,
6013         },
6014         {
6015                 .procname       = "drop_unsolicited_na",
6016                 .data           = &ipv6_devconf.drop_unsolicited_na,
6017                 .maxlen         = sizeof(int),
6018                 .mode           = 0644,
6019                 .proc_handler   = proc_dointvec,
6020         },
6021         {
6022                 .procname       = "keep_addr_on_down",
6023                 .data           = &ipv6_devconf.keep_addr_on_down,
6024                 .maxlen         = sizeof(int),
6025                 .mode           = 0644,
6026                 .proc_handler   = proc_dointvec,
6027
6028         },
6029         {
6030                 /* sentinel */
6031         }
6032 };
6033
6034 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6035                 struct inet6_dev *idev, struct ipv6_devconf *p)
6036 {
6037         int i, ifindex;
6038         struct ctl_table *table;
6039         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6040
6041         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6042         if (!table)
6043                 goto out;
6044
6045         for (i = 0; table[i].data; i++) {
6046                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6047                 table[i].extra1 = idev; /* embedded; no ref */
6048                 table[i].extra2 = net;
6049         }
6050
6051         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6052
6053         p->sysctl_header = register_net_sysctl(net, path, table);
6054         if (!p->sysctl_header)
6055                 goto free;
6056
6057         if (!strcmp(dev_name, "all"))
6058                 ifindex = NETCONFA_IFINDEX_ALL;
6059         else if (!strcmp(dev_name, "default"))
6060                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6061         else
6062                 ifindex = idev->dev->ifindex;
6063         inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6064         return 0;
6065
6066 free:
6067         kfree(table);
6068 out:
6069         return -ENOBUFS;
6070 }
6071
6072 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6073 {
6074         struct ctl_table *table;
6075
6076         if (!p->sysctl_header)
6077                 return;
6078
6079         table = p->sysctl_header->ctl_table_arg;
6080         unregister_net_sysctl_table(p->sysctl_header);
6081         p->sysctl_header = NULL;
6082         kfree(table);
6083 }
6084
6085 static int addrconf_sysctl_register(struct inet6_dev *idev)
6086 {
6087         int err;
6088
6089         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6090                 return -EINVAL;
6091
6092         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6093                                     &ndisc_ifinfo_sysctl_change);
6094         if (err)
6095                 return err;
6096         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6097                                          idev, &idev->cnf);
6098         if (err)
6099                 neigh_sysctl_unregister(idev->nd_parms);
6100
6101         return err;
6102 }
6103
6104 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6105 {
6106         __addrconf_sysctl_unregister(&idev->cnf);
6107         neigh_sysctl_unregister(idev->nd_parms);
6108 }
6109
6110
6111 #endif
6112
6113 static int __net_init addrconf_init_net(struct net *net)
6114 {
6115         int err = -ENOMEM;
6116         struct ipv6_devconf *all, *dflt;
6117
6118         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6119         if (!all)
6120                 goto err_alloc_all;
6121
6122         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6123         if (!dflt)
6124                 goto err_alloc_dflt;
6125
6126         /* these will be inherited by all namespaces */
6127         dflt->autoconf = ipv6_defaults.autoconf;
6128         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6129
6130         dflt->stable_secret.initialized = false;
6131         all->stable_secret.initialized = false;
6132
6133         net->ipv6.devconf_all = all;
6134         net->ipv6.devconf_dflt = dflt;
6135
6136 #ifdef CONFIG_SYSCTL
6137         err = __addrconf_sysctl_register(net, "all", NULL, all);
6138         if (err < 0)
6139                 goto err_reg_all;
6140
6141         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6142         if (err < 0)
6143                 goto err_reg_dflt;
6144 #endif
6145         return 0;
6146
6147 #ifdef CONFIG_SYSCTL
6148 err_reg_dflt:
6149         __addrconf_sysctl_unregister(all);
6150 err_reg_all:
6151         kfree(dflt);
6152 #endif
6153 err_alloc_dflt:
6154         kfree(all);
6155 err_alloc_all:
6156         return err;
6157 }
6158
6159 static void __net_exit addrconf_exit_net(struct net *net)
6160 {
6161 #ifdef CONFIG_SYSCTL
6162         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6163         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6164 #endif
6165         kfree(net->ipv6.devconf_dflt);
6166         kfree(net->ipv6.devconf_all);
6167 }
6168
6169 static struct pernet_operations addrconf_ops = {
6170         .init = addrconf_init_net,
6171         .exit = addrconf_exit_net,
6172 };
6173
6174 static struct rtnl_af_ops inet6_ops __read_mostly = {
6175         .family           = AF_INET6,
6176         .fill_link_af     = inet6_fill_link_af,
6177         .get_link_af_size = inet6_get_link_af_size,
6178         .validate_link_af = inet6_validate_link_af,
6179         .set_link_af      = inet6_set_link_af,
6180 };
6181
6182 /*
6183  *      Init / cleanup code
6184  */
6185
6186 int __init addrconf_init(void)
6187 {
6188         struct inet6_dev *idev;
6189         int i, err;
6190
6191         err = ipv6_addr_label_init();
6192         if (err < 0) {
6193                 pr_crit("%s: cannot initialize default policy table: %d\n",
6194                         __func__, err);
6195                 goto out;
6196         }
6197
6198         err = register_pernet_subsys(&addrconf_ops);
6199         if (err < 0)
6200                 goto out_addrlabel;
6201
6202         addrconf_wq = create_workqueue("ipv6_addrconf");
6203         if (!addrconf_wq) {
6204                 err = -ENOMEM;
6205                 goto out_nowq;
6206         }
6207
6208         /* The addrconf netdev notifier requires that loopback_dev
6209          * has it's ipv6 private information allocated and setup
6210          * before it can bring up and give link-local addresses
6211          * to other devices which are up.
6212          *
6213          * Unfortunately, loopback_dev is not necessarily the first
6214          * entry in the global dev_base list of net devices.  In fact,
6215          * it is likely to be the very last entry on that list.
6216          * So this causes the notifier registry below to try and
6217          * give link-local addresses to all devices besides loopback_dev
6218          * first, then loopback_dev, which cases all the non-loopback_dev
6219          * devices to fail to get a link-local address.
6220          *
6221          * So, as a temporary fix, allocate the ipv6 structure for
6222          * loopback_dev first by hand.
6223          * Longer term, all of the dependencies ipv6 has upon the loopback
6224          * device and it being up should be removed.
6225          */
6226         rtnl_lock();
6227         idev = ipv6_add_dev(init_net.loopback_dev);
6228         rtnl_unlock();
6229         if (IS_ERR(idev)) {
6230                 err = PTR_ERR(idev);
6231                 goto errlo;
6232         }
6233
6234         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6235                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6236
6237         register_netdevice_notifier(&ipv6_dev_notf);
6238
6239         addrconf_verify();
6240
6241         rtnl_af_register(&inet6_ops);
6242
6243         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6244                               NULL);
6245         if (err < 0)
6246                 goto errout;
6247
6248         /* Only the first call to __rtnl_register can fail */
6249         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6250         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6251         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6252                         inet6_dump_ifaddr, NULL);
6253         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6254                         inet6_dump_ifmcaddr, NULL);
6255         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6256                         inet6_dump_ifacaddr, NULL);
6257         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6258                         inet6_netconf_dump_devconf, NULL);
6259
6260         ipv6_addr_label_rtnl_register();
6261
6262         return 0;
6263 errout:
6264         rtnl_af_unregister(&inet6_ops);
6265         unregister_netdevice_notifier(&ipv6_dev_notf);
6266 errlo:
6267         destroy_workqueue(addrconf_wq);
6268 out_nowq:
6269         unregister_pernet_subsys(&addrconf_ops);
6270 out_addrlabel:
6271         ipv6_addr_label_cleanup();
6272 out:
6273         return err;
6274 }
6275
6276 void addrconf_cleanup(void)
6277 {
6278         struct net_device *dev;
6279         int i;
6280
6281         unregister_netdevice_notifier(&ipv6_dev_notf);
6282         unregister_pernet_subsys(&addrconf_ops);
6283         ipv6_addr_label_cleanup();
6284
6285         rtnl_lock();
6286
6287         __rtnl_af_unregister(&inet6_ops);
6288
6289         /* clean dev list */
6290         for_each_netdev(&init_net, dev) {
6291                 if (__in6_dev_get(dev) == NULL)
6292                         continue;
6293                 addrconf_ifdown(dev, 1);
6294         }
6295         addrconf_ifdown(init_net.loopback_dev, 2);
6296
6297         /*
6298          *      Check hash table.
6299          */
6300         spin_lock_bh(&addrconf_hash_lock);
6301         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6302                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6303         spin_unlock_bh(&addrconf_hash_lock);
6304         cancel_delayed_work(&addr_chk_work);
6305         rtnl_unlock();
6306
6307         destroy_workqueue(addrconf_wq);
6308 }