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_ATOMIC);
 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_ATOMIC);
 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                 net->ipv6.devconf_dflt->forwarding = newf;
 782                 addrconf_forward_change(net, newf);
 783                 if ((!newf) ^ (!old))
 784                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 785                                                      NETCONFA_IFINDEX_ALL,
 786                                                      net->ipv6.devconf_all);
 787         } else if ((!newf) ^ (!old))
 788                 dev_forward_change((struct inet6_dev *)table->extra1);
 789         rtnl_unlock();
 790
 791         if (newf)
 792                 rt6_purge_dflt_routers(net);
 793         return 1;
 794 }
 795
 796 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 797 {
 798         struct net_device *dev;
 799         struct inet6_dev *idev;
 800
 801         for_each_netdev(net, dev) {
 802                 idev = __in6_dev_get(dev);
 803                 if (idev) {
 804                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 805
 806                         idev->cnf.ignore_routes_with_linkdown = newf;
 807                         if (changed)
 808                                 inet6_netconf_notify_devconf(dev_net(dev),
 809                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 810                                                              dev->ifindex,
 811                                                              &idev->cnf);
 812                 }
 813         }
 814 }
 815
 816 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 817 {
 818         struct net *net;
 819         int old;
 820
 821         if (!rtnl_trylock())
 822                 return restart_syscall();
 823
 824         net = (struct net *)table->extra2;
 825         old = *p;
 826         *p = newf;
 827
 828         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 829                 if ((!newf) ^ (!old))
 830                         inet6_netconf_notify_devconf(net,
 831                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 832                                                      NETCONFA_IFINDEX_DEFAULT,
 833                                                      net->ipv6.devconf_dflt);
 834                 rtnl_unlock();
 835                 return 0;
 836         }
 837
 838         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 839                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 840                 addrconf_linkdown_change(net, newf);
 841                 if ((!newf) ^ (!old))
 842                         inet6_netconf_notify_devconf(net,
 843                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 844                                                      NETCONFA_IFINDEX_ALL,
 845                                                      net->ipv6.devconf_all);
 846         }
 847         rtnl_unlock();
 848
 849         return 1;
 850 }
 851
 852 #endif
 853
 854 /* Nobody refers to this ifaddr, destroy it */
 855 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 856 {
 857         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 858
 859 #ifdef NET_REFCNT_DEBUG
 860         pr_debug("%s\n", __func__);
 861 #endif
 862
 863         in6_dev_put(ifp->idev);
 864
 865         if (cancel_delayed_work(&ifp->dad_work))
 866                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 867                           ifp);
 868
 869         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 870                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 871                 return;
 872         }
 873         ip6_rt_put(ifp->rt);
 874
 875         kfree_rcu(ifp, rcu);
 876 }
 877
 878 static void
 879 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 880 {
 881         struct list_head *p;
 882         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 883
 884         /*
 885          * Each device address list is sorted in order of scope -
 886          * global before linklocal.
 887          */
 888         list_for_each(p, &idev->addr_list) {
 889                 struct inet6_ifaddr *ifa
 890                         = list_entry(p, struct inet6_ifaddr, if_list);
 891                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 892                         break;
 893         }
 894
 895         list_add_tail(&ifp->if_list, p);
 896 }
 897
 898 static u32 inet6_addr_hash(const struct in6_addr *addr)
 899 {
 900         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 901 }
 902
 903 /* On success it returns ifp with increased reference count */
 904
 905 static struct inet6_ifaddr *
 906 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 907               const struct in6_addr *peer_addr, int pfxlen,
 908               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 909 {
 910         struct inet6_ifaddr *ifa = NULL;
 911         struct rt6_info *rt;
 912         unsigned int hash;
 913         int err = 0;
 914         int addr_type = ipv6_addr_type(addr);
 915
 916         if (addr_type == IPV6_ADDR_ANY ||
 917             addr_type & IPV6_ADDR_MULTICAST ||
 918             (!(idev->dev->flags & IFF_LOOPBACK) &&
 919              addr_type & IPV6_ADDR_LOOPBACK))
 920                 return ERR_PTR(-EADDRNOTAVAIL);
 921
 922         rcu_read_lock_bh();
 923         if (idev->dead) {
 924                 err = -ENODEV;                  /*XXX*/
 925                 goto out2;
 926         }
 927
 928         if (idev->cnf.disable_ipv6) {
 929                 err = -EACCES;
 930                 goto out2;
 931         }
 932
 933         spin_lock(&addrconf_hash_lock);
 934
 935         /* Ignore adding duplicate addresses on an interface */
 936         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 937                 ADBG("ipv6_add_addr: already assigned\n");
 938                 err = -EEXIST;
 939                 goto out;
 940         }
 941
 942         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 943
 944         if (!ifa) {
 945                 ADBG("ipv6_add_addr: malloc failed\n");
 946                 err = -ENOBUFS;
 947                 goto out;
 948         }
 949
 950         rt = addrconf_dst_alloc(idev, addr, false);
 951         if (IS_ERR(rt)) {
 952                 err = PTR_ERR(rt);
 953                 goto out;
 954         }
 955
 956         neigh_parms_data_state_setall(idev->nd_parms);
 957
 958         ifa->addr = *addr;
 959         if (peer_addr)
 960                 ifa->peer_addr = *peer_addr;
 961
 962         spin_lock_init(&ifa->lock);
 963         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 964         INIT_HLIST_NODE(&ifa->addr_lst);
 965         ifa->scope = scope;
 966         ifa->prefix_len = pfxlen;
 967         ifa->flags = flags | IFA_F_TENTATIVE;
 968         ifa->valid_lft = valid_lft;
 969         ifa->prefered_lft = prefered_lft;
 970         ifa->cstamp = ifa->tstamp = jiffies;
 971         ifa->tokenized = false;
 972
 973         ifa->rt = rt;
 974
 975         ifa->idev = idev;
 976         in6_dev_hold(idev);
 977         /* For caller */
 978         in6_ifa_hold(ifa);
 979
 980         /* Add to big hash table */
 981         hash = inet6_addr_hash(addr);
 982
 983         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 984         spin_unlock(&addrconf_hash_lock);
 985
 986         write_lock(&idev->lock);
 987         /* Add to inet6_dev unicast addr list. */
 988         ipv6_link_dev_addr(idev, ifa);
 989
 990         if (ifa->flags&IFA_F_TEMPORARY) {
 991                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 992                 in6_ifa_hold(ifa);
 993         }
 994
 995         in6_ifa_hold(ifa);
 996         write_unlock(&idev->lock);
 997 out2:
 998         rcu_read_unlock_bh();
 999
1000         if (likely(err == 0))
1001                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1002         else {
1003                 kfree(ifa);
1004                 ifa = ERR_PTR(err);
1005         }
1006
1007         return ifa;
1008 out:
1009         spin_unlock(&addrconf_hash_lock);
1010         goto out2;
1011 }
1012
1013 enum cleanup_prefix_rt_t {
1014         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1015         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1016         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1017 };
1018
1019 /*
1020  * Check, whether the prefix for ifp would still need a prefix route
1021  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1022  * constants.
1023  *
1024  * 1) we don't purge prefix if address was not permanent.
1025  *    prefix is managed by its own lifetime.
1026  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1027  * 3) if there are no addresses, delete prefix.
1028  * 4) if there are still other permanent address(es),
1029  *    corresponding prefix is still permanent.
1030  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1031  *    don't purge the prefix, assume user space is managing it.
1032  * 6) otherwise, update prefix lifetime to the
1033  *    longest valid lifetime among the corresponding
1034  *    addresses on the device.
1035  *    Note: subsequent RA will update lifetime.
1036  **/
1037 static enum cleanup_prefix_rt_t
1038 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1039 {
1040         struct inet6_ifaddr *ifa;
1041         struct inet6_dev *idev = ifp->idev;
1042         unsigned long lifetime;
1043         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1044
1045         *expires = jiffies;
1046
1047         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1048                 if (ifa == ifp)
1049                         continue;
1050                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1051                                        ifp->prefix_len))
1052                         continue;
1053                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1054                         return CLEANUP_PREFIX_RT_NOP;
1055
1056                 action = CLEANUP_PREFIX_RT_EXPIRE;
1057
1058                 spin_lock(&ifa->lock);
1059
1060                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1061                 /*
1062                  * Note: Because this address is
1063                  * not permanent, lifetime <
1064                  * LONG_MAX / HZ here.
1065                  */
1066                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1067                         *expires = ifa->tstamp + lifetime * HZ;
1068                 spin_unlock(&ifa->lock);
1069         }
1070
1071         return action;
1072 }
1073
1074 static void
1075 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1076 {
1077         struct rt6_info *rt;
1078
1079         rt = addrconf_get_prefix_route(&ifp->addr,
1080                                        ifp->prefix_len,
1081                                        ifp->idev->dev,
1082                                        0, RTF_GATEWAY | RTF_DEFAULT);
1083         if (rt) {
1084                 if (del_rt)
1085                         ip6_del_rt(rt);
1086                 else {
1087                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1088                                 rt6_set_expires(rt, expires);
1089                         ip6_rt_put(rt);
1090                 }
1091         }
1092 }
1093
1094
1095 /* This function wants to get referenced ifp and releases it before return */
1096
1097 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1098 {
1099         int state;
1100         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1101         unsigned long expires;
1102
1103         ASSERT_RTNL();
1104
1105         spin_lock_bh(&ifp->lock);
1106         state = ifp->state;
1107         ifp->state = INET6_IFADDR_STATE_DEAD;
1108         spin_unlock_bh(&ifp->lock);
1109
1110         if (state == INET6_IFADDR_STATE_DEAD)
1111                 goto out;
1112
1113         spin_lock_bh(&addrconf_hash_lock);
1114         hlist_del_init_rcu(&ifp->addr_lst);
1115         spin_unlock_bh(&addrconf_hash_lock);
1116
1117         write_lock_bh(&ifp->idev->lock);
1118
1119         if (ifp->flags&IFA_F_TEMPORARY) {
1120                 list_del(&ifp->tmp_list);
1121                 if (ifp->ifpub) {
1122                         in6_ifa_put(ifp->ifpub);
1123                         ifp->ifpub = NULL;
1124                 }
1125                 __in6_ifa_put(ifp);
1126         }
1127
1128         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1129                 action = check_cleanup_prefix_route(ifp, &expires);
1130
1131         list_del_init(&ifp->if_list);
1132         __in6_ifa_put(ifp);
1133
1134         write_unlock_bh(&ifp->idev->lock);
1135
1136         addrconf_del_dad_work(ifp);
1137
1138         ipv6_ifa_notify(RTM_DELADDR, ifp);
1139
1140         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1141
1142         if (action != CLEANUP_PREFIX_RT_NOP) {
1143                 cleanup_prefix_route(ifp, expires,
1144                         action == CLEANUP_PREFIX_RT_DEL);
1145         }
1146
1147         /* clean up prefsrc entries */
1148         rt6_remove_prefsrc(ifp);
1149 out:
1150         in6_ifa_put(ifp);
1151 }
1152
1153 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1154 {
1155         struct inet6_dev *idev = ifp->idev;
1156         struct in6_addr addr, *tmpaddr;
1157         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1158         unsigned long regen_advance;
1159         int tmp_plen;
1160         int ret = 0;
1161         u32 addr_flags;
1162         unsigned long now = jiffies;
1163
1164         write_lock_bh(&idev->lock);
1165         if (ift) {
1166                 spin_lock_bh(&ift->lock);
1167                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1168                 spin_unlock_bh(&ift->lock);
1169                 tmpaddr = &addr;
1170         } else {
1171                 tmpaddr = NULL;
1172         }
1173 retry:
1174         in6_dev_hold(idev);
1175         if (idev->cnf.use_tempaddr <= 0) {
1176                 write_unlock_bh(&idev->lock);
1177                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1178                 in6_dev_put(idev);
1179                 ret = -1;
1180                 goto out;
1181         }
1182         spin_lock_bh(&ifp->lock);
1183         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1184                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1185                 spin_unlock_bh(&ifp->lock);
1186                 write_unlock_bh(&idev->lock);
1187                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1188                         __func__);
1189                 in6_dev_put(idev);
1190                 ret = -1;
1191                 goto out;
1192         }
1193         in6_ifa_hold(ifp);
1194         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1195         __ipv6_try_regen_rndid(idev, tmpaddr);
1196         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1197         age = (now - ifp->tstamp) / HZ;
1198         tmp_valid_lft = min_t(__u32,
1199                               ifp->valid_lft,
1200                               idev->cnf.temp_valid_lft + age);
1201         tmp_prefered_lft = min_t(__u32,
1202                                  ifp->prefered_lft,
1203                                  idev->cnf.temp_prefered_lft + age -
1204                                  idev->cnf.max_desync_factor);
1205         tmp_plen = ifp->prefix_len;
1206         tmp_tstamp = ifp->tstamp;
1207         spin_unlock_bh(&ifp->lock);
1208
1209         regen_advance = idev->cnf.regen_max_retry *
1210                         idev->cnf.dad_transmits *
1211                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1212         write_unlock_bh(&idev->lock);
1213
1214         /* A temporary address is created only if this calculated Preferred
1215          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1216          * an implementation must not create a temporary address with a zero
1217          * Preferred Lifetime.
1218          * Use age calculation as in addrconf_verify to avoid unnecessary
1219          * temporary addresses being generated.
1220          */
1221         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1222         if (tmp_prefered_lft <= regen_advance + age) {
1223                 in6_ifa_put(ifp);
1224                 in6_dev_put(idev);
1225                 ret = -1;
1226                 goto out;
1227         }
1228
1229         addr_flags = IFA_F_TEMPORARY;
1230         /* set in addrconf_prefix_rcv() */
1231         if (ifp->flags & IFA_F_OPTIMISTIC)
1232                 addr_flags |= IFA_F_OPTIMISTIC;
1233
1234         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1235                             ipv6_addr_scope(&addr), addr_flags,
1236                             tmp_valid_lft, tmp_prefered_lft);
1237         if (IS_ERR(ift)) {
1238                 in6_ifa_put(ifp);
1239                 in6_dev_put(idev);
1240                 pr_info("%s: retry temporary address regeneration\n", __func__);
1241                 tmpaddr = &addr;
1242                 write_lock_bh(&idev->lock);
1243                 goto retry;
1244         }
1245
1246         spin_lock_bh(&ift->lock);
1247         ift->ifpub = ifp;
1248         ift->cstamp = now;
1249         ift->tstamp = tmp_tstamp;
1250         spin_unlock_bh(&ift->lock);
1251
1252         addrconf_dad_start(ift);
1253         in6_ifa_put(ift);
1254         in6_dev_put(idev);
1255 out:
1256         return ret;
1257 }
1258
1259 /*
1260  *      Choose an appropriate source address (RFC3484)
1261  */
1262 enum {
1263         IPV6_SADDR_RULE_INIT = 0,
1264         IPV6_SADDR_RULE_LOCAL,
1265         IPV6_SADDR_RULE_SCOPE,
1266         IPV6_SADDR_RULE_PREFERRED,
1267 #ifdef CONFIG_IPV6_MIP6
1268         IPV6_SADDR_RULE_HOA,
1269 #endif
1270         IPV6_SADDR_RULE_OIF,
1271         IPV6_SADDR_RULE_LABEL,
1272         IPV6_SADDR_RULE_PRIVACY,
1273         IPV6_SADDR_RULE_ORCHID,
1274         IPV6_SADDR_RULE_PREFIX,
1275 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1276         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1277 #endif
1278         IPV6_SADDR_RULE_MAX
1279 };
1280
1281 struct ipv6_saddr_score {
1282         int                     rule;
1283         int                     addr_type;
1284         struct inet6_ifaddr     *ifa;
1285         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1286         int                     scopedist;
1287         int                     matchlen;
1288 };
1289
1290 struct ipv6_saddr_dst {
1291         const struct in6_addr *addr;
1292         int ifindex;
1293         int scope;
1294         int label;
1295         unsigned int prefs;
1296 };
1297
1298 static inline int ipv6_saddr_preferred(int type)
1299 {
1300         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1301                 return 1;
1302         return 0;
1303 }
1304
1305 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1306 {
1307 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1308         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1309 #else
1310         return false;
1311 #endif
1312 }
1313
1314 static int ipv6_get_saddr_eval(struct net *net,
1315                                struct ipv6_saddr_score *score,
1316                                struct ipv6_saddr_dst *dst,
1317                                int i)
1318 {
1319         int ret;
1320
1321         if (i <= score->rule) {
1322                 switch (i) {
1323                 case IPV6_SADDR_RULE_SCOPE:
1324                         ret = score->scopedist;
1325                         break;
1326                 case IPV6_SADDR_RULE_PREFIX:
1327                         ret = score->matchlen;
1328                         break;
1329                 default:
1330                         ret = !!test_bit(i, score->scorebits);
1331                 }
1332                 goto out;
1333         }
1334
1335         switch (i) {
1336         case IPV6_SADDR_RULE_INIT:
1337                 /* Rule 0: remember if hiscore is not ready yet */
1338                 ret = !!score->ifa;
1339                 break;
1340         case IPV6_SADDR_RULE_LOCAL:
1341                 /* Rule 1: Prefer same address */
1342                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1343                 break;
1344         case IPV6_SADDR_RULE_SCOPE:
1345                 /* Rule 2: Prefer appropriate scope
1346                  *
1347                  *      ret
1348                  *       ^
1349                  *    -1 |  d 15
1350                  *    ---+--+-+---> scope
1351                  *       |
1352                  *       |             d is scope of the destination.
1353                  *  B-d  |  \
1354                  *       |   \      <- smaller scope is better if
1355                  *  B-15 |    \        if scope is enough for destination.
1356                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1357                  * d-C-1 | /
1358                  *       |/         <- greater is better
1359                  *   -C  /             if scope is not enough for destination.
1360                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1361                  *
1362                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1363                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1364                  * Assume B = 0 and we get C > 29.
1365                  */
1366                 ret = __ipv6_addr_src_scope(score->addr_type);
1367                 if (ret >= dst->scope)
1368                         ret = -ret;
1369                 else
1370                         ret -= 128;     /* 30 is enough */
1371                 score->scopedist = ret;
1372                 break;
1373         case IPV6_SADDR_RULE_PREFERRED:
1374             {
1375                 /* Rule 3: Avoid deprecated and optimistic addresses */
1376                 u8 avoid = IFA_F_DEPRECATED;
1377
1378                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1379                         avoid |= IFA_F_OPTIMISTIC;
1380                 ret = ipv6_saddr_preferred(score->addr_type) ||
1381                       !(score->ifa->flags & avoid);
1382                 break;
1383             }
1384 #ifdef CONFIG_IPV6_MIP6
1385         case IPV6_SADDR_RULE_HOA:
1386             {
1387                 /* Rule 4: Prefer home address */
1388                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1389                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1390                 break;
1391             }
1392 #endif
1393         case IPV6_SADDR_RULE_OIF:
1394                 /* Rule 5: Prefer outgoing interface */
1395                 ret = (!dst->ifindex ||
1396                        dst->ifindex == score->ifa->idev->dev->ifindex);
1397                 break;
1398         case IPV6_SADDR_RULE_LABEL:
1399                 /* Rule 6: Prefer matching label */
1400                 ret = ipv6_addr_label(net,
1401                                       &score->ifa->addr, score->addr_type,
1402                                       score->ifa->idev->dev->ifindex) == dst->label;
1403                 break;
1404         case IPV6_SADDR_RULE_PRIVACY:
1405             {
1406                 /* Rule 7: Prefer public address
1407                  * Note: prefer temporary address if use_tempaddr >= 2
1408                  */
1409                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1410                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1411                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1412                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1413                 break;
1414             }
1415         case IPV6_SADDR_RULE_ORCHID:
1416                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1417                  *          non-ORCHID vs non-ORCHID
1418                  */
1419                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1420                         ipv6_addr_orchid(dst->addr));
1421                 break;
1422         case IPV6_SADDR_RULE_PREFIX:
1423                 /* Rule 8: Use longest matching prefix */
1424                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1425                 if (ret > score->ifa->prefix_len)
1426                         ret = score->ifa->prefix_len;
1427                 score->matchlen = ret;
1428                 break;
1429 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1430         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1431                 /* Optimistic addresses still have lower precedence than other
1432                  * preferred addresses.
1433                  */
1434                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1435                 break;
1436 #endif
1437         default:
1438                 ret = 0;
1439         }
1440
1441         if (ret)
1442                 __set_bit(i, score->scorebits);
1443         score->rule = i;
1444 out:
1445         return ret;
1446 }
1447
1448 static int __ipv6_dev_get_saddr(struct net *net,
1449                                 struct ipv6_saddr_dst *dst,
1450                                 struct inet6_dev *idev,
1451                                 struct ipv6_saddr_score *scores,
1452                                 int hiscore_idx)
1453 {
1454         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1455
1456         read_lock_bh(&idev->lock);
1457         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1458                 int i;
1459
1460                 /*
1461                  * - Tentative Address (RFC2462 section 5.4)
1462                  *  - A tentative address is not considered
1463                  *    "assigned to an interface" in the traditional
1464                  *    sense, unless it is also flagged as optimistic.
1465                  * - Candidate Source Address (section 4)
1466                  *  - In any case, anycast addresses, multicast
1467                  *    addresses, and the unspecified address MUST
1468                  *    NOT be included in a candidate set.
1469                  */
1470                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1471                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1472                         continue;
1473
1474                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1475
1476                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1477                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1478                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1479                                             idev->dev->name);
1480                         continue;
1481                 }
1482
1483                 score->rule = -1;
1484                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1485
1486                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1487                         int minihiscore, miniscore;
1488
1489                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1490                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1491
1492                         if (minihiscore > miniscore) {
1493                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1494                                     score->scopedist > 0) {
1495                                         /*
1496                                          * special case:
1497                                          * each remaining entry
1498                                          * has too small (not enough)
1499                                          * scope, because ifa entries
1500                                          * are sorted by their scope
1501                                          * values.
1502                                          */
1503                                         goto out;
1504                                 }
1505                                 break;
1506                         } else if (minihiscore < miniscore) {
1507                                 if (hiscore->ifa)
1508                                         in6_ifa_put(hiscore->ifa);
1509
1510                                 in6_ifa_hold(score->ifa);
1511
1512                                 swap(hiscore, score);
1513                                 hiscore_idx = 1 - hiscore_idx;
1514
1515                                 /* restore our iterator */
1516                                 score->ifa = hiscore->ifa;
1517
1518                                 break;
1519                         }
1520                 }
1521         }
1522 out:
1523         read_unlock_bh(&idev->lock);
1524         return hiscore_idx;
1525 }
1526
1527 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1528                        const struct in6_addr *daddr, unsigned int prefs,
1529                        struct in6_addr *saddr)
1530 {
1531         struct ipv6_saddr_score scores[2], *hiscore;
1532         struct ipv6_saddr_dst dst;
1533         struct inet6_dev *idev;
1534         struct net_device *dev;
1535         int dst_type;
1536         bool use_oif_addr = false;
1537         int hiscore_idx = 0;
1538
1539         dst_type = __ipv6_addr_type(daddr);
1540         dst.addr = daddr;
1541         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1542         dst.scope = __ipv6_addr_src_scope(dst_type);
1543         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1544         dst.prefs = prefs;
1545
1546         scores[hiscore_idx].rule = -1;
1547         scores[hiscore_idx].ifa = NULL;
1548
1549         rcu_read_lock();
1550
1551         /* Candidate Source Address (section 4)
1552          *  - multicast and link-local destination address,
1553          *    the set of candidate source address MUST only
1554          *    include addresses assigned to interfaces
1555          *    belonging to the same link as the outgoing
1556          *    interface.
1557          * (- For site-local destination addresses, the
1558          *    set of candidate source addresses MUST only
1559          *    include addresses assigned to interfaces
1560          *    belonging to the same site as the outgoing
1561          *    interface.)
1562          *  - "It is RECOMMENDED that the candidate source addresses
1563          *    be the set of unicast addresses assigned to the
1564          *    interface that will be used to send to the destination
1565          *    (the 'outgoing' interface)." (RFC 6724)
1566          */
1567         if (dst_dev) {
1568                 idev = __in6_dev_get(dst_dev);
1569                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1570                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1571                     (idev && idev->cnf.use_oif_addrs_only)) {
1572                         use_oif_addr = true;
1573                 }
1574         }
1575
1576         if (use_oif_addr) {
1577                 if (idev)
1578                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1579         } else {
1580                 for_each_netdev_rcu(net, dev) {
1581                         idev = __in6_dev_get(dev);
1582                         if (!idev)
1583                                 continue;
1584                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1585                 }
1586         }
1587         rcu_read_unlock();
1588
1589         hiscore = &scores[hiscore_idx];
1590         if (!hiscore->ifa)
1591                 return -EADDRNOTAVAIL;
1592
1593         *saddr = hiscore->ifa->addr;
1594         in6_ifa_put(hiscore->ifa);
1595         return 0;
1596 }
1597 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1598
1599 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1600                       u32 banned_flags)
1601 {
1602         struct inet6_ifaddr *ifp;
1603         int err = -EADDRNOTAVAIL;
1604
1605         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1606                 if (ifp->scope > IFA_LINK)
1607                         break;
1608                 if (ifp->scope == IFA_LINK &&
1609                     !(ifp->flags & banned_flags)) {
1610                         *addr = ifp->addr;
1611                         err = 0;
1612                         break;
1613                 }
1614         }
1615         return err;
1616 }
1617
1618 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1619                     u32 banned_flags)
1620 {
1621         struct inet6_dev *idev;
1622         int err = -EADDRNOTAVAIL;
1623
1624         rcu_read_lock();
1625         idev = __in6_dev_get(dev);
1626         if (idev) {
1627                 read_lock_bh(&idev->lock);
1628                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1629                 read_unlock_bh(&idev->lock);
1630         }
1631         rcu_read_unlock();
1632         return err;
1633 }
1634
1635 static int ipv6_count_addresses(struct inet6_dev *idev)
1636 {
1637         int cnt = 0;
1638         struct inet6_ifaddr *ifp;
1639
1640         read_lock_bh(&idev->lock);
1641         list_for_each_entry(ifp, &idev->addr_list, if_list)
1642                 cnt++;
1643         read_unlock_bh(&idev->lock);
1644         return cnt;
1645 }
1646
1647 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1648                   const struct net_device *dev, int strict)
1649 {
1650         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1651 }
1652 EXPORT_SYMBOL(ipv6_chk_addr);
1653
1654 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1655                             const struct net_device *dev, int strict,
1656                             u32 banned_flags)
1657 {
1658         struct inet6_ifaddr *ifp;
1659         unsigned int hash = inet6_addr_hash(addr);
1660         u32 ifp_flags;
1661
1662         rcu_read_lock_bh();
1663         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1664                 if (!net_eq(dev_net(ifp->idev->dev), net))
1665                         continue;
1666                 /* Decouple optimistic from tentative for evaluation here.
1667                  * Ban optimistic addresses explicitly, when required.
1668                  */
1669                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1670                             ? (ifp->flags&~IFA_F_TENTATIVE)
1671                             : ifp->flags;
1672                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1673                     !(ifp_flags&banned_flags) &&
1674                     (!dev || ifp->idev->dev == dev ||
1675                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1676                         rcu_read_unlock_bh();
1677                         return 1;
1678                 }
1679         }
1680
1681         rcu_read_unlock_bh();
1682         return 0;
1683 }
1684 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1685
1686 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1687                                struct net_device *dev)
1688 {
1689         unsigned int hash = inet6_addr_hash(addr);
1690         struct inet6_ifaddr *ifp;
1691
1692         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1693                 if (!net_eq(dev_net(ifp->idev->dev), net))
1694                         continue;
1695                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1696                         if (!dev || ifp->idev->dev == dev)
1697                                 return true;
1698                 }
1699         }
1700         return false;
1701 }
1702
1703 /* Compares an address/prefix_len with addresses on device @dev.
1704  * If one is found it returns true.
1705  */
1706 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1707         const unsigned int prefix_len, struct net_device *dev)
1708 {
1709         struct inet6_dev *idev;
1710         struct inet6_ifaddr *ifa;
1711         bool ret = false;
1712
1713         rcu_read_lock();
1714         idev = __in6_dev_get(dev);
1715         if (idev) {
1716                 read_lock_bh(&idev->lock);
1717                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1718                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1719                         if (ret)
1720                                 break;
1721                 }
1722                 read_unlock_bh(&idev->lock);
1723         }
1724         rcu_read_unlock();
1725
1726         return ret;
1727 }
1728 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1729
1730 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1731 {
1732         struct inet6_dev *idev;
1733         struct inet6_ifaddr *ifa;
1734         int     onlink;
1735
1736         onlink = 0;
1737         rcu_read_lock();
1738         idev = __in6_dev_get(dev);
1739         if (idev) {
1740                 read_lock_bh(&idev->lock);
1741                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1742                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1743                                                    ifa->prefix_len);
1744                         if (onlink)
1745                                 break;
1746                 }
1747                 read_unlock_bh(&idev->lock);
1748         }
1749         rcu_read_unlock();
1750         return onlink;
1751 }
1752 EXPORT_SYMBOL(ipv6_chk_prefix);
1753
1754 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1755                                      struct net_device *dev, int strict)
1756 {
1757         struct inet6_ifaddr *ifp, *result = NULL;
1758         unsigned int hash = inet6_addr_hash(addr);
1759
1760         rcu_read_lock_bh();
1761         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1762                 if (!net_eq(dev_net(ifp->idev->dev), net))
1763                         continue;
1764                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1765                         if (!dev || ifp->idev->dev == dev ||
1766                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1767                                 result = ifp;
1768                                 in6_ifa_hold(ifp);
1769                                 break;
1770                         }
1771                 }
1772         }
1773         rcu_read_unlock_bh();
1774
1775         return result;
1776 }
1777
1778 /* Gets referenced address, destroys ifaddr */
1779
1780 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1781 {
1782         if (dad_failed)
1783                 ifp->flags |= IFA_F_DADFAILED;
1784
1785         if (ifp->flags&IFA_F_PERMANENT) {
1786                 spin_lock_bh(&ifp->lock);
1787                 addrconf_del_dad_work(ifp);
1788                 ifp->flags |= IFA_F_TENTATIVE;
1789                 spin_unlock_bh(&ifp->lock);
1790                 if (dad_failed)
1791                         ipv6_ifa_notify(0, ifp);
1792                 in6_ifa_put(ifp);
1793         } else if (ifp->flags&IFA_F_TEMPORARY) {
1794                 struct inet6_ifaddr *ifpub;
1795                 spin_lock_bh(&ifp->lock);
1796                 ifpub = ifp->ifpub;
1797                 if (ifpub) {
1798                         in6_ifa_hold(ifpub);
1799                         spin_unlock_bh(&ifp->lock);
1800                         ipv6_create_tempaddr(ifpub, ifp);
1801                         in6_ifa_put(ifpub);
1802                 } else {
1803                         spin_unlock_bh(&ifp->lock);
1804                 }
1805                 ipv6_del_addr(ifp);
1806         } else {
1807                 ipv6_del_addr(ifp);
1808         }
1809 }
1810
1811 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1812 {
1813         int err = -ENOENT;
1814
1815         spin_lock_bh(&ifp->lock);
1816         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1817                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1818                 err = 0;
1819         }
1820         spin_unlock_bh(&ifp->lock);
1821
1822         return err;
1823 }
1824
1825 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1826 {
1827         struct in6_addr addr;
1828         struct inet6_dev *idev = ifp->idev;
1829         struct net *net = dev_net(ifp->idev->dev);
1830
1831         if (addrconf_dad_end(ifp)) {
1832                 in6_ifa_put(ifp);
1833                 return;
1834         }
1835
1836         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1837                              ifp->idev->dev->name, &ifp->addr);
1838
1839         spin_lock_bh(&ifp->lock);
1840
1841         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1842                 int scope = ifp->scope;
1843                 u32 flags = ifp->flags;
1844                 struct in6_addr new_addr;
1845                 struct inet6_ifaddr *ifp2;
1846                 u32 valid_lft, preferred_lft;
1847                 int pfxlen = ifp->prefix_len;
1848                 int retries = ifp->stable_privacy_retry + 1;
1849
1850                 if (retries > net->ipv6.sysctl.idgen_retries) {
1851                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1852                                              ifp->idev->dev->name);
1853                         goto errdad;
1854                 }
1855
1856                 new_addr = ifp->addr;
1857                 if (ipv6_generate_stable_address(&new_addr, retries,
1858                                                  idev))
1859                         goto errdad;
1860
1861                 valid_lft = ifp->valid_lft;
1862                 preferred_lft = ifp->prefered_lft;
1863
1864                 spin_unlock_bh(&ifp->lock);
1865
1866                 if (idev->cnf.max_addresses &&
1867                     ipv6_count_addresses(idev) >=
1868                     idev->cnf.max_addresses)
1869                         goto lock_errdad;
1870
1871                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1872                                      ifp->idev->dev->name);
1873
1874                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1875                                      scope, flags, valid_lft,
1876                                      preferred_lft);
1877                 if (IS_ERR(ifp2))
1878                         goto lock_errdad;
1879
1880                 spin_lock_bh(&ifp2->lock);
1881                 ifp2->stable_privacy_retry = retries;
1882                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1883                 spin_unlock_bh(&ifp2->lock);
1884
1885                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1886                 in6_ifa_put(ifp2);
1887 lock_errdad:
1888                 spin_lock_bh(&ifp->lock);
1889         } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1890                 addr.s6_addr32[0] = htonl(0xfe800000);
1891                 addr.s6_addr32[1] = 0;
1892
1893                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1894                     ipv6_addr_equal(&ifp->addr, &addr)) {
1895                         /* DAD failed for link-local based on MAC address */
1896                         idev->cnf.disable_ipv6 = 1;
1897
1898                         pr_info("%s: IPv6 being disabled!\n",
1899                                 ifp->idev->dev->name);
1900                 }
1901         }
1902
1903 errdad:
1904         /* transition from _POSTDAD to _ERRDAD */
1905         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1906         spin_unlock_bh(&ifp->lock);
1907
1908         addrconf_mod_dad_work(ifp, 0);
1909 }
1910
1911 /* Join to solicited addr multicast group.
1912  * caller must hold RTNL */
1913 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1914 {
1915         struct in6_addr maddr;
1916
1917         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1918                 return;
1919
1920         addrconf_addr_solict_mult(addr, &maddr);
1921         ipv6_dev_mc_inc(dev, &maddr);
1922 }
1923
1924 /* caller must hold RTNL */
1925 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1926 {
1927         struct in6_addr maddr;
1928
1929         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1930                 return;
1931
1932         addrconf_addr_solict_mult(addr, &maddr);
1933         __ipv6_dev_mc_dec(idev, &maddr);
1934 }
1935
1936 /* caller must hold RTNL */
1937 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1938 {
1939         struct in6_addr addr;
1940
1941         if (ifp->prefix_len >= 127) /* RFC 6164 */
1942                 return;
1943         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1944         if (ipv6_addr_any(&addr))
1945                 return;
1946         __ipv6_dev_ac_inc(ifp->idev, &addr);
1947 }
1948
1949 /* caller must hold RTNL */
1950 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1951 {
1952         struct in6_addr addr;
1953
1954         if (ifp->prefix_len >= 127) /* RFC 6164 */
1955                 return;
1956         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1957         if (ipv6_addr_any(&addr))
1958                 return;
1959         __ipv6_dev_ac_dec(ifp->idev, &addr);
1960 }
1961
1962 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1963 {
1964         if (dev->addr_len != EUI64_ADDR_LEN)
1965                 return -1;
1966         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
1967         eui[0] ^= 2;
1968         return 0;
1969 }
1970
1971 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1972 {
1973         union fwnet_hwaddr *ha;
1974
1975         if (dev->addr_len != FWNET_ALEN)
1976                 return -1;
1977
1978         ha = (union fwnet_hwaddr *)dev->dev_addr;
1979
1980         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1981         eui[0] ^= 2;
1982         return 0;
1983 }
1984
1985 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1986 {
1987         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1988         if (dev->addr_len != ARCNET_ALEN)
1989                 return -1;
1990         memset(eui, 0, 7);
1991         eui[7] = *(u8 *)dev->dev_addr;
1992         return 0;
1993 }
1994
1995 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1996 {
1997         if (dev->addr_len != INFINIBAND_ALEN)
1998                 return -1;
1999         memcpy(eui, dev->dev_addr + 12, 8);
2000         eui[0] |= 2;
2001         return 0;
2002 }
2003
2004 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2005 {
2006         if (addr == 0)
2007                 return -1;
2008         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2009                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2010                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2011                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2012                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2013                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2014         eui[1] = 0;
2015         eui[2] = 0x5E;
2016         eui[3] = 0xFE;
2017         memcpy(eui + 4, &addr, 4);
2018         return 0;
2019 }
2020
2021 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2022 {
2023         if (dev->priv_flags & IFF_ISATAP)
2024                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2025         return -1;
2026 }
2027
2028 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2029 {
2030         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2031 }
2032
2033 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2034 {
2035         memcpy(eui, dev->perm_addr, 3);
2036         memcpy(eui + 5, dev->perm_addr + 3, 3);
2037         eui[3] = 0xFF;
2038         eui[4] = 0xFE;
2039         eui[0] ^= 2;
2040         return 0;
2041 }
2042
2043 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2044 {
2045         switch (dev->type) {
2046         case ARPHRD_ETHER:
2047         case ARPHRD_FDDI:
2048                 return addrconf_ifid_eui48(eui, dev);
2049         case ARPHRD_ARCNET:
2050                 return addrconf_ifid_arcnet(eui, dev);
2051         case ARPHRD_INFINIBAND:
2052                 return addrconf_ifid_infiniband(eui, dev);
2053         case ARPHRD_SIT:
2054                 return addrconf_ifid_sit(eui, dev);
2055         case ARPHRD_IPGRE:
2056                 return addrconf_ifid_gre(eui, dev);
2057         case ARPHRD_6LOWPAN:
2058                 return addrconf_ifid_eui64(eui, dev);
2059         case ARPHRD_IEEE1394:
2060                 return addrconf_ifid_ieee1394(eui, dev);
2061         case ARPHRD_TUNNEL6:
2062                 return addrconf_ifid_ip6tnl(eui, dev);
2063         }
2064         return -1;
2065 }
2066
2067 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2068 {
2069         int err = -1;
2070         struct inet6_ifaddr *ifp;
2071
2072         read_lock_bh(&idev->lock);
2073         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2074                 if (ifp->scope > IFA_LINK)
2075                         break;
2076                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2077                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2078                         err = 0;
2079                         break;
2080                 }
2081         }
2082         read_unlock_bh(&idev->lock);
2083         return err;
2084 }
2085
2086 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2087 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2088 {
2089 regen:
2090         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2091         idev->rndid[0] &= ~0x02;
2092
2093         /*
2094          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2095          * check if generated address is not inappropriate
2096          *
2097          *  - Reserved subnet anycast (RFC 2526)
2098          *      11111101 11....11 1xxxxxxx
2099          *  - ISATAP (RFC4214) 6.1
2100          *      00-00-5E-FE-xx-xx-xx-xx
2101          *  - value 0
2102          *  - XXX: already assigned to an address on the device
2103          */
2104         if (idev->rndid[0] == 0xfd &&
2105             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2106             (idev->rndid[7]&0x80))
2107                 goto regen;
2108         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2109                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2110                         goto regen;
2111                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2112                         goto regen;
2113         }
2114 }
2115
2116 static void ipv6_regen_rndid(unsigned long data)
2117 {
2118         struct inet6_dev *idev = (struct inet6_dev *) data;
2119         unsigned long expires;
2120
2121         rcu_read_lock_bh();
2122         write_lock_bh(&idev->lock);
2123
2124         if (idev->dead)
2125                 goto out;
2126
2127         __ipv6_regen_rndid(idev);
2128
2129         expires = jiffies +
2130                 idev->cnf.temp_prefered_lft * HZ -
2131                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2132                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2133                 idev->cnf.max_desync_factor * HZ;
2134         if (time_before(expires, jiffies)) {
2135                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2136                         __func__, idev->dev->name);
2137                 goto out;
2138         }
2139
2140         if (!mod_timer(&idev->regen_timer, expires))
2141                 in6_dev_hold(idev);
2142
2143 out:
2144         write_unlock_bh(&idev->lock);
2145         rcu_read_unlock_bh();
2146         in6_dev_put(idev);
2147 }
2148
2149 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2150 {
2151         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2152                 __ipv6_regen_rndid(idev);
2153 }
2154
2155 /*
2156  *      Add prefix route.
2157  */
2158
2159 static void
2160 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2161                       unsigned long expires, u32 flags)
2162 {
2163         struct fib6_config cfg = {
2164                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2165                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2166                 .fc_ifindex = dev->ifindex,
2167                 .fc_expires = expires,
2168                 .fc_dst_len = plen,
2169                 .fc_flags = RTF_UP | flags,
2170                 .fc_nlinfo.nl_net = dev_net(dev),
2171                 .fc_protocol = RTPROT_KERNEL,
2172         };
2173
2174         cfg.fc_dst = *pfx;
2175
2176         /* Prevent useless cloning on PtP SIT.
2177            This thing is done here expecting that the whole
2178            class of non-broadcast devices need not cloning.
2179          */
2180 #if IS_ENABLED(CONFIG_IPV6_SIT)
2181         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2182                 cfg.fc_flags |= RTF_NONEXTHOP;
2183 #endif
2184
2185         ip6_route_add(&cfg);
2186 }
2187
2188
2189 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2190                                                   int plen,
2191                                                   const struct net_device *dev,
2192                                                   u32 flags, u32 noflags)
2193 {
2194         struct fib6_node *fn;
2195         struct rt6_info *rt = NULL;
2196         struct fib6_table *table;
2197         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2198
2199         table = fib6_get_table(dev_net(dev), tb_id);
2200         if (!table)
2201                 return NULL;
2202
2203         read_lock_bh(&table->tb6_lock);
2204         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2205         if (!fn)
2206                 goto out;
2207
2208         noflags |= RTF_CACHE;
2209         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2210                 if (rt->dst.dev->ifindex != dev->ifindex)
2211                         continue;
2212                 if ((rt->rt6i_flags & flags) != flags)
2213                         continue;
2214                 if ((rt->rt6i_flags & noflags) != 0)
2215                         continue;
2216                 dst_hold(&rt->dst);
2217                 break;
2218         }
2219 out:
2220         read_unlock_bh(&table->tb6_lock);
2221         return rt;
2222 }
2223
2224
2225 /* Create "default" multicast route to the interface */
2226
2227 static void addrconf_add_mroute(struct net_device *dev)
2228 {
2229         struct fib6_config cfg = {
2230                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2231                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2232                 .fc_ifindex = dev->ifindex,
2233                 .fc_dst_len = 8,
2234                 .fc_flags = RTF_UP,
2235                 .fc_nlinfo.nl_net = dev_net(dev),
2236         };
2237
2238         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2239
2240         ip6_route_add(&cfg);
2241 }
2242
2243 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2244 {
2245         struct inet6_dev *idev;
2246
2247         ASSERT_RTNL();
2248
2249         idev = ipv6_find_idev(dev);
2250         if (!idev)
2251                 return ERR_PTR(-ENOBUFS);
2252
2253         if (idev->cnf.disable_ipv6)
2254                 return ERR_PTR(-EACCES);
2255
2256         /* Add default multicast route */
2257         if (!(dev->flags & IFF_LOOPBACK))
2258                 addrconf_add_mroute(dev);
2259
2260         return idev;
2261 }
2262
2263 static void manage_tempaddrs(struct inet6_dev *idev,
2264                              struct inet6_ifaddr *ifp,
2265                              __u32 valid_lft, __u32 prefered_lft,
2266                              bool create, unsigned long now)
2267 {
2268         u32 flags;
2269         struct inet6_ifaddr *ift;
2270
2271         read_lock_bh(&idev->lock);
2272         /* update all temporary addresses in the list */
2273         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2274                 int age, max_valid, max_prefered;
2275
2276                 if (ifp != ift->ifpub)
2277                         continue;
2278
2279                 /* RFC 4941 section 3.3:
2280                  * If a received option will extend the lifetime of a public
2281                  * address, the lifetimes of temporary addresses should
2282                  * be extended, subject to the overall constraint that no
2283                  * temporary addresses should ever remain "valid" or "preferred"
2284                  * for a time longer than (TEMP_VALID_LIFETIME) or
2285                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2286                  */
2287                 age = (now - ift->cstamp) / HZ;
2288                 max_valid = idev->cnf.temp_valid_lft - age;
2289                 if (max_valid < 0)
2290                         max_valid = 0;
2291
2292                 max_prefered = idev->cnf.temp_prefered_lft -
2293                                idev->cnf.max_desync_factor - age;
2294                 if (max_prefered < 0)
2295                         max_prefered = 0;
2296
2297                 if (valid_lft > max_valid)
2298                         valid_lft = max_valid;
2299
2300                 if (prefered_lft > max_prefered)
2301                         prefered_lft = max_prefered;
2302
2303                 spin_lock(&ift->lock);
2304                 flags = ift->flags;
2305                 ift->valid_lft = valid_lft;
2306                 ift->prefered_lft = prefered_lft;
2307                 ift->tstamp = now;
2308                 if (prefered_lft > 0)
2309                         ift->flags &= ~IFA_F_DEPRECATED;
2310
2311                 spin_unlock(&ift->lock);
2312                 if (!(flags&IFA_F_TENTATIVE))
2313                         ipv6_ifa_notify(0, ift);
2314         }
2315
2316         if ((create || list_empty(&idev->tempaddr_list)) &&
2317             idev->cnf.use_tempaddr > 0) {
2318                 /* When a new public address is created as described
2319                  * in [ADDRCONF], also create a new temporary address.
2320                  * Also create a temporary address if it's enabled but
2321                  * no temporary address currently exists.
2322                  */
2323                 read_unlock_bh(&idev->lock);
2324                 ipv6_create_tempaddr(ifp, NULL);
2325         } else {
2326                 read_unlock_bh(&idev->lock);
2327         }
2328 }
2329
2330 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2331 {
2332         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2333                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2334 }
2335
2336 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2337 {
2338         struct prefix_info *pinfo;
2339         __u32 valid_lft;
2340         __u32 prefered_lft;
2341         int addr_type;
2342         u32 addr_flags = 0;
2343         struct inet6_dev *in6_dev;
2344         struct net *net = dev_net(dev);
2345
2346         pinfo = (struct prefix_info *) opt;
2347
2348         if (len < sizeof(struct prefix_info)) {
2349                 ADBG("addrconf: prefix option too short\n");
2350                 return;
2351         }
2352
2353         /*
2354          *      Validation checks ([ADDRCONF], page 19)
2355          */
2356
2357         addr_type = ipv6_addr_type(&pinfo->prefix);
2358
2359         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2360                 return;
2361
2362         valid_lft = ntohl(pinfo->valid);
2363         prefered_lft = ntohl(pinfo->prefered);
2364
2365         if (prefered_lft > valid_lft) {
2366                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2367                 return;
2368         }
2369
2370         in6_dev = in6_dev_get(dev);
2371
2372         if (!in6_dev) {
2373                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2374                                     dev->name);
2375                 return;
2376         }
2377
2378         /*
2379          *      Two things going on here:
2380          *      1) Add routes for on-link prefixes
2381          *      2) Configure prefixes with the auto flag set
2382          */
2383
2384         if (pinfo->onlink) {
2385                 struct rt6_info *rt;
2386                 unsigned long rt_expires;
2387
2388                 /* Avoid arithmetic overflow. Really, we could
2389                  * save rt_expires in seconds, likely valid_lft,
2390                  * but it would require division in fib gc, that it
2391                  * not good.
2392                  */
2393                 if (HZ > USER_HZ)
2394                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2395                 else
2396                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2397
2398                 if (addrconf_finite_timeout(rt_expires))
2399                         rt_expires *= HZ;
2400
2401                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2402                                                pinfo->prefix_len,
2403                                                dev,
2404                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2405                                                RTF_GATEWAY | RTF_DEFAULT);
2406
2407                 if (rt) {
2408                         /* Autoconf prefix route */
2409                         if (valid_lft == 0) {
2410                                 ip6_del_rt(rt);
2411                                 rt = NULL;
2412                         } else if (addrconf_finite_timeout(rt_expires)) {
2413                                 /* not infinity */
2414                                 rt6_set_expires(rt, jiffies + rt_expires);
2415                         } else {
2416                                 rt6_clean_expires(rt);
2417                         }
2418                 } else if (valid_lft) {
2419                         clock_t expires = 0;
2420                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2421                         if (addrconf_finite_timeout(rt_expires)) {
2422                                 /* not infinity */
2423                                 flags |= RTF_EXPIRES;
2424                                 expires = jiffies_to_clock_t(rt_expires);
2425                         }
2426                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2427                                               dev, expires, flags);
2428                 }
2429                 ip6_rt_put(rt);
2430         }
2431
2432         /* Try to figure out our local address for this prefix */
2433
2434         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2435                 struct inet6_ifaddr *ifp;
2436                 struct in6_addr addr;
2437                 int create = 0, update_lft = 0;
2438                 bool tokenized = false;
2439
2440                 if (pinfo->prefix_len == 64) {
2441                         memcpy(&addr, &pinfo->prefix, 8);
2442
2443                         if (!ipv6_addr_any(&in6_dev->token)) {
2444                                 read_lock_bh(&in6_dev->lock);
2445                                 memcpy(addr.s6_addr + 8,
2446                                        in6_dev->token.s6_addr + 8, 8);
2447                                 read_unlock_bh(&in6_dev->lock);
2448                                 tokenized = true;
2449                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2450                                    !ipv6_generate_stable_address(&addr, 0,
2451                                                                  in6_dev)) {
2452                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2453                                 goto ok;
2454                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2455                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2456                                 in6_dev_put(in6_dev);
2457                                 return;
2458                         }
2459                         goto ok;
2460                 }
2461                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2462                                     pinfo->prefix_len);
2463                 in6_dev_put(in6_dev);
2464                 return;
2465
2466 ok:
2467
2468                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2469
2470                 if (!ifp && valid_lft) {
2471                         int max_addresses = in6_dev->cnf.max_addresses;
2472
2473 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2474                         if (in6_dev->cnf.optimistic_dad &&
2475                             !net->ipv6.devconf_all->forwarding && sllao)
2476                                 addr_flags |= IFA_F_OPTIMISTIC;
2477 #endif
2478
2479                         /* Do not allow to create too much of autoconfigured
2480                          * addresses; this would be too easy way to crash kernel.
2481                          */
2482                         if (!max_addresses ||
2483                             ipv6_count_addresses(in6_dev) < max_addresses)
2484                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2485                                                     pinfo->prefix_len,
2486                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2487                                                     addr_flags, valid_lft,
2488                                                     prefered_lft);
2489
2490                         if (IS_ERR_OR_NULL(ifp)) {
2491                                 in6_dev_put(in6_dev);
2492                                 return;
2493                         }
2494
2495                         update_lft = 0;
2496                         create = 1;
2497                         spin_lock_bh(&ifp->lock);
2498                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2499                         ifp->cstamp = jiffies;
2500                         ifp->tokenized = tokenized;
2501                         spin_unlock_bh(&ifp->lock);
2502                         addrconf_dad_start(ifp);
2503                 }
2504
2505                 if (ifp) {
2506                         u32 flags;
2507                         unsigned long now;
2508                         u32 stored_lft;
2509
2510                         /* update lifetime (RFC2462 5.5.3 e) */
2511                         spin_lock_bh(&ifp->lock);
2512                         now = jiffies;
2513                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2514                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2515                         else
2516                                 stored_lft = 0;
2517                         if (!update_lft && !create && stored_lft) {
2518                                 const u32 minimum_lft = min_t(u32,
2519                                         stored_lft, MIN_VALID_LIFETIME);
2520                                 valid_lft = max(valid_lft, minimum_lft);
2521
2522                                 /* RFC4862 Section 5.5.3e:
2523                                  * "Note that the preferred lifetime of the
2524                                  *  corresponding address is always reset to
2525                                  *  the Preferred Lifetime in the received
2526                                  *  Prefix Information option, regardless of
2527                                  *  whether the valid lifetime is also reset or
2528                                  *  ignored."
2529                                  *
2530                                  * So we should always update prefered_lft here.
2531                                  */
2532                                 update_lft = 1;
2533                         }
2534
2535                         if (update_lft) {
2536                                 ifp->valid_lft = valid_lft;
2537                                 ifp->prefered_lft = prefered_lft;
2538                                 ifp->tstamp = now;
2539                                 flags = ifp->flags;
2540                                 ifp->flags &= ~IFA_F_DEPRECATED;
2541                                 spin_unlock_bh(&ifp->lock);
2542
2543                                 if (!(flags&IFA_F_TENTATIVE))
2544                                         ipv6_ifa_notify(0, ifp);
2545                         } else
2546                                 spin_unlock_bh(&ifp->lock);
2547
2548                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2549                                          create, now);
2550
2551                         in6_ifa_put(ifp);
2552                         addrconf_verify();
2553                 }
2554         }
2555         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2556         in6_dev_put(in6_dev);
2557 }
2558
2559 /*
2560  *      Set destination address.
2561  *      Special case for SIT interfaces where we create a new "virtual"
2562  *      device.
2563  */
2564 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2565 {
2566         struct in6_ifreq ireq;
2567         struct net_device *dev;
2568         int err = -EINVAL;
2569
2570         rtnl_lock();
2571
2572         err = -EFAULT;
2573         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2574                 goto err_exit;
2575
2576         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2577
2578         err = -ENODEV;
2579         if (!dev)
2580                 goto err_exit;
2581
2582 #if IS_ENABLED(CONFIG_IPV6_SIT)
2583         if (dev->type == ARPHRD_SIT) {
2584                 const struct net_device_ops *ops = dev->netdev_ops;
2585                 struct ifreq ifr;
2586                 struct ip_tunnel_parm p;
2587
2588                 err = -EADDRNOTAVAIL;
2589                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2590                         goto err_exit;
2591
2592                 memset(&p, 0, sizeof(p));
2593                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2594                 p.iph.saddr = 0;
2595                 p.iph.version = 4;
2596                 p.iph.ihl = 5;
2597                 p.iph.protocol = IPPROTO_IPV6;
2598                 p.iph.ttl = 64;
2599                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2600
2601                 if (ops->ndo_do_ioctl) {
2602                         mm_segment_t oldfs = get_fs();
2603
2604                         set_fs(KERNEL_DS);
2605                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2606                         set_fs(oldfs);
2607                 } else
2608                         err = -EOPNOTSUPP;
2609
2610                 if (err == 0) {
2611                         err = -ENOBUFS;
2612                         dev = __dev_get_by_name(net, p.name);
2613                         if (!dev)
2614                                 goto err_exit;
2615                         err = dev_open(dev);
2616                 }
2617         }
2618 #endif
2619
2620 err_exit:
2621         rtnl_unlock();
2622         return err;
2623 }
2624
2625 static int ipv6_mc_config(struct sock *sk, bool join,
2626                           const struct in6_addr *addr, int ifindex)
2627 {
2628         int ret;
2629
2630         ASSERT_RTNL();
2631
2632         lock_sock(sk);
2633         if (join)
2634                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2635         else
2636                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2637         release_sock(sk);
2638
2639         return ret;
2640 }
2641
2642 /*
2643  *      Manual configuration of address on an interface
2644  */
2645 static int inet6_addr_add(struct net *net, int ifindex,
2646                           const struct in6_addr *pfx,
2647                           const struct in6_addr *peer_pfx,
2648                           unsigned int plen, __u32 ifa_flags,
2649                           __u32 prefered_lft, __u32 valid_lft)
2650 {
2651         struct inet6_ifaddr *ifp;
2652         struct inet6_dev *idev;
2653         struct net_device *dev;
2654         unsigned long timeout;
2655         clock_t expires;
2656         int scope;
2657         u32 flags;
2658
2659         ASSERT_RTNL();
2660
2661         if (plen > 128)
2662                 return -EINVAL;
2663
2664         /* check the lifetime */
2665         if (!valid_lft || prefered_lft > valid_lft)
2666                 return -EINVAL;
2667
2668         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2669                 return -EINVAL;
2670
2671         dev = __dev_get_by_index(net, ifindex);
2672         if (!dev)
2673                 return -ENODEV;
2674
2675         idev = addrconf_add_dev(dev);
2676         if (IS_ERR(idev))
2677                 return PTR_ERR(idev);
2678
2679         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2680                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2681                                          true, pfx, ifindex);
2682
2683                 if (ret < 0)
2684                         return ret;
2685         }
2686
2687         scope = ipv6_addr_scope(pfx);
2688
2689         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2690         if (addrconf_finite_timeout(timeout)) {
2691                 expires = jiffies_to_clock_t(timeout * HZ);
2692                 valid_lft = timeout;
2693                 flags = RTF_EXPIRES;
2694         } else {
2695                 expires = 0;
2696                 flags = 0;
2697                 ifa_flags |= IFA_F_PERMANENT;
2698         }
2699
2700         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2701         if (addrconf_finite_timeout(timeout)) {
2702                 if (timeout == 0)
2703                         ifa_flags |= IFA_F_DEPRECATED;
2704                 prefered_lft = timeout;
2705         }
2706
2707         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2708                             valid_lft, prefered_lft);
2709
2710         if (!IS_ERR(ifp)) {
2711                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2712                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2713                                               expires, flags);
2714                 }
2715
2716                 /*
2717                  * Note that section 3.1 of RFC 4429 indicates
2718                  * that the Optimistic flag should not be set for
2719                  * manually configured addresses
2720                  */
2721                 addrconf_dad_start(ifp);
2722                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2723                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2724                                          true, jiffies);
2725                 in6_ifa_put(ifp);
2726                 addrconf_verify_rtnl();
2727                 return 0;
2728         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2729                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2730                                false, pfx, ifindex);
2731         }
2732
2733         return PTR_ERR(ifp);
2734 }
2735
2736 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2737                           const struct in6_addr *pfx, unsigned int plen)
2738 {
2739         struct inet6_ifaddr *ifp;
2740         struct inet6_dev *idev;
2741         struct net_device *dev;
2742
2743         if (plen > 128)
2744                 return -EINVAL;
2745
2746         dev = __dev_get_by_index(net, ifindex);
2747         if (!dev)
2748                 return -ENODEV;
2749
2750         idev = __in6_dev_get(dev);
2751         if (!idev)
2752                 return -ENXIO;
2753
2754         read_lock_bh(&idev->lock);
2755         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2756                 if (ifp->prefix_len == plen &&
2757                     ipv6_addr_equal(pfx, &ifp->addr)) {
2758                         in6_ifa_hold(ifp);
2759                         read_unlock_bh(&idev->lock);
2760
2761                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2762                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2763                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2764                                                  jiffies);
2765                         ipv6_del_addr(ifp);
2766                         addrconf_verify_rtnl();
2767                         if (ipv6_addr_is_multicast(pfx)) {
2768                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2769                                                false, pfx, dev->ifindex);
2770                         }
2771                         return 0;
2772                 }
2773         }
2774         read_unlock_bh(&idev->lock);
2775         return -EADDRNOTAVAIL;
2776 }
2777
2778
2779 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2780 {
2781         struct in6_ifreq ireq;
2782         int err;
2783
2784         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2785                 return -EPERM;
2786
2787         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2788                 return -EFAULT;
2789
2790         rtnl_lock();
2791         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2792                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2793                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2794         rtnl_unlock();
2795         return err;
2796 }
2797
2798 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2799 {
2800         struct in6_ifreq ireq;
2801         int err;
2802
2803         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2804                 return -EPERM;
2805
2806         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2807                 return -EFAULT;
2808
2809         rtnl_lock();
2810         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2811                              ireq.ifr6_prefixlen);
2812         rtnl_unlock();
2813         return err;
2814 }
2815
2816 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2817                      int plen, int scope)
2818 {
2819         struct inet6_ifaddr *ifp;
2820
2821         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2822                             scope, IFA_F_PERMANENT,
2823                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2824         if (!IS_ERR(ifp)) {
2825                 spin_lock_bh(&ifp->lock);
2826                 ifp->flags &= ~IFA_F_TENTATIVE;
2827                 spin_unlock_bh(&ifp->lock);
2828                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2829                 in6_ifa_put(ifp);
2830         }
2831 }
2832
2833 #if IS_ENABLED(CONFIG_IPV6_SIT)
2834 static void sit_add_v4_addrs(struct inet6_dev *idev)
2835 {
2836         struct in6_addr addr;
2837         struct net_device *dev;
2838         struct net *net = dev_net(idev->dev);
2839         int scope, plen;
2840         u32 pflags = 0;
2841
2842         ASSERT_RTNL();
2843
2844         memset(&addr, 0, sizeof(struct in6_addr));
2845         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2846
2847         if (idev->dev->flags&IFF_POINTOPOINT) {
2848                 addr.s6_addr32[0] = htonl(0xfe800000);
2849                 scope = IFA_LINK;
2850                 plen = 64;
2851         } else {
2852                 scope = IPV6_ADDR_COMPATv4;
2853                 plen = 96;
2854                 pflags |= RTF_NONEXTHOP;
2855         }
2856
2857         if (addr.s6_addr32[3]) {
2858                 add_addr(idev, &addr, plen, scope);
2859                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2860                 return;
2861         }
2862
2863         for_each_netdev(net, dev) {
2864                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2865                 if (in_dev && (dev->flags & IFF_UP)) {
2866                         struct in_ifaddr *ifa;
2867
2868                         int flag = scope;
2869
2870                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2871
2872                                 addr.s6_addr32[3] = ifa->ifa_local;
2873
2874                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2875                                         continue;
2876                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2877                                         if (idev->dev->flags&IFF_POINTOPOINT)
2878                                                 continue;
2879                                         flag |= IFA_HOST;
2880                                 }
2881
2882                                 add_addr(idev, &addr, plen, flag);
2883                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2884                                                       pflags);
2885                         }
2886                 }
2887         }
2888 }
2889 #endif
2890
2891 static void init_loopback(struct net_device *dev)
2892 {
2893         struct inet6_dev  *idev;
2894         struct net_device *sp_dev;
2895         struct inet6_ifaddr *sp_ifa;
2896         struct rt6_info *sp_rt;
2897
2898         /* ::1 */
2899
2900         ASSERT_RTNL();
2901
2902         idev = ipv6_find_idev(dev);
2903         if (!idev) {
2904                 pr_debug("%s: add_dev failed\n", __func__);
2905                 return;
2906         }
2907
2908         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2909
2910         /* Add routes to other interface's IPv6 addresses */
2911         for_each_netdev(dev_net(dev), sp_dev) {
2912                 if (!strcmp(sp_dev->name, dev->name))
2913                         continue;
2914
2915                 idev = __in6_dev_get(sp_dev);
2916                 if (!idev)
2917                         continue;
2918
2919                 read_lock_bh(&idev->lock);
2920                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2921
2922                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2923                                 continue;
2924
2925                         if (sp_ifa->rt) {
2926                                 /* This dst has been added to garbage list when
2927                                  * lo device down, release this obsolete dst and
2928                                  * reallocate a new router for ifa.
2929                                  */
2930                                 if (sp_ifa->rt->dst.obsolete > 0) {
2931                                         ip6_rt_put(sp_ifa->rt);
2932                                         sp_ifa->rt = NULL;
2933                                 } else {
2934                                         continue;
2935                                 }
2936                         }
2937
2938                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2939
2940                         /* Failure cases are ignored */
2941                         if (!IS_ERR(sp_rt)) {
2942                                 sp_ifa->rt = sp_rt;
2943                                 ip6_ins_rt(sp_rt);
2944                         }
2945                 }
2946                 read_unlock_bh(&idev->lock);
2947         }
2948 }
2949
2950 static void addrconf_add_linklocal(struct inet6_dev *idev,
2951                                    const struct in6_addr *addr, u32 flags)
2952 {
2953         struct inet6_ifaddr *ifp;
2954         u32 addr_flags = flags | IFA_F_PERMANENT;
2955
2956 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2957         if (idev->cnf.optimistic_dad &&
2958             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2959                 addr_flags |= IFA_F_OPTIMISTIC;
2960 #endif
2961
2962         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2963                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2964         if (!IS_ERR(ifp)) {
2965                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2966                 addrconf_dad_start(ifp);
2967                 in6_ifa_put(ifp);
2968         }
2969 }
2970
2971 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2972 {
2973         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2974                 return true;
2975
2976         if (address.s6_addr32[2] == htonl(0x02005eff) &&
2977             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2978                 return true;
2979
2980         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2981             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2982                 return true;
2983
2984         return false;
2985 }
2986
2987 static int ipv6_generate_stable_address(struct in6_addr *address,
2988                                         u8 dad_count,
2989                                         const struct inet6_dev *idev)
2990 {
2991         static DEFINE_SPINLOCK(lock);
2992         static __u32 digest[SHA_DIGEST_WORDS];
2993         static __u32 workspace[SHA_WORKSPACE_WORDS];
2994
2995         static union {
2996                 char __data[SHA_MESSAGE_BYTES];
2997                 struct {
2998                         struct in6_addr secret;
2999                         __be32 prefix[2];
3000                         unsigned char hwaddr[MAX_ADDR_LEN];
3001                         u8 dad_count;
3002                 } __packed;
3003         } data;
3004
3005         struct in6_addr secret;
3006         struct in6_addr temp;
3007         struct net *net = dev_net(idev->dev);
3008
3009         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3010
3011         if (idev->cnf.stable_secret.initialized)
3012                 secret = idev->cnf.stable_secret.secret;
3013         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3014                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3015         else
3016                 return -1;
3017
3018 retry:
3019         spin_lock_bh(&lock);
3020
3021         sha_init(digest);
3022         memset(&data, 0, sizeof(data));
3023         memset(workspace, 0, sizeof(workspace));
3024         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3025         data.prefix[0] = address->s6_addr32[0];
3026         data.prefix[1] = address->s6_addr32[1];
3027         data.secret = secret;
3028         data.dad_count = dad_count;
3029
3030         sha_transform(digest, data.__data, workspace);
3031
3032         temp = *address;
3033         temp.s6_addr32[2] = (__force __be32)digest[0];
3034         temp.s6_addr32[3] = (__force __be32)digest[1];
3035
3036         spin_unlock_bh(&lock);
3037
3038         if (ipv6_reserved_interfaceid(temp)) {
3039                 dad_count++;
3040                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3041                         return -1;
3042                 goto retry;
3043         }
3044
3045         *address = temp;
3046         return 0;
3047 }
3048
3049 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3050 {
3051         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3052
3053         if (s->initialized)
3054                 return;
3055         s = &idev->cnf.stable_secret;
3056         get_random_bytes(&s->secret, sizeof(s->secret));
3057         s->initialized = true;
3058 }
3059
3060 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3061 {
3062         struct in6_addr addr;
3063
3064         /* no link local addresses on L3 master devices */
3065         if (netif_is_l3_master(idev->dev))
3066                 return;
3067
3068         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3069
3070         switch (idev->addr_gen_mode) {
3071         case IN6_ADDR_GEN_MODE_RANDOM:
3072                 ipv6_gen_mode_random_init(idev);
3073                 /* fallthrough */
3074         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3075                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3076                         addrconf_add_linklocal(idev, &addr,
3077                                                IFA_F_STABLE_PRIVACY);
3078                 else if (prefix_route)
3079                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3080                 break;
3081         case IN6_ADDR_GEN_MODE_EUI64:
3082                 /* addrconf_add_linklocal also adds a prefix_route and we
3083                  * only need to care about prefix routes if ipv6_generate_eui64
3084                  * couldn't generate one.
3085                  */
3086                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3087                         addrconf_add_linklocal(idev, &addr, 0);
3088                 else if (prefix_route)
3089                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3090                 break;
3091         case IN6_ADDR_GEN_MODE_NONE:
3092         default:
3093                 /* will not add any link local address */
3094                 break;
3095         }
3096 }
3097
3098 static void addrconf_dev_config(struct net_device *dev)
3099 {
3100         struct inet6_dev *idev;
3101
3102         ASSERT_RTNL();
3103
3104         if ((dev->type != ARPHRD_ETHER) &&
3105             (dev->type != ARPHRD_FDDI) &&
3106             (dev->type != ARPHRD_ARCNET) &&
3107             (dev->type != ARPHRD_INFINIBAND) &&
3108             (dev->type != ARPHRD_IEEE1394) &&
3109             (dev->type != ARPHRD_TUNNEL6) &&
3110             (dev->type != ARPHRD_6LOWPAN) &&
3111             (dev->type != ARPHRD_NONE)) {
3112                 /* Alas, we support only Ethernet autoconfiguration. */
3113                 return;
3114         }
3115
3116         idev = addrconf_add_dev(dev);
3117         if (IS_ERR(idev))
3118                 return;
3119
3120         /* this device type has no EUI support */
3121         if (dev->type == ARPHRD_NONE &&
3122             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3123                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3124
3125         addrconf_addr_gen(idev, false);
3126 }
3127
3128 #if IS_ENABLED(CONFIG_IPV6_SIT)
3129 static void addrconf_sit_config(struct net_device *dev)
3130 {
3131         struct inet6_dev *idev;
3132
3133         ASSERT_RTNL();
3134
3135         /*
3136          * Configure the tunnel with one of our IPv4
3137          * addresses... we should configure all of
3138          * our v4 addrs in the tunnel
3139          */
3140
3141         idev = ipv6_find_idev(dev);
3142         if (!idev) {
3143                 pr_debug("%s: add_dev failed\n", __func__);
3144                 return;
3145         }
3146
3147         if (dev->priv_flags & IFF_ISATAP) {
3148                 addrconf_addr_gen(idev, false);
3149                 return;
3150         }
3151
3152         sit_add_v4_addrs(idev);
3153
3154         if (dev->flags&IFF_POINTOPOINT)
3155                 addrconf_add_mroute(dev);
3156 }
3157 #endif
3158
3159 #if IS_ENABLED(CONFIG_NET_IPGRE)
3160 static void addrconf_gre_config(struct net_device *dev)
3161 {
3162         struct inet6_dev *idev;
3163
3164         ASSERT_RTNL();
3165
3166         idev = ipv6_find_idev(dev);
3167         if (!idev) {
3168                 pr_debug("%s: add_dev failed\n", __func__);
3169                 return;
3170         }
3171
3172         addrconf_addr_gen(idev, true);
3173         if (dev->flags & IFF_POINTOPOINT)
3174                 addrconf_add_mroute(dev);
3175 }
3176 #endif
3177
3178 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
3179 /* If the host route is cached on the addr struct make sure it is associated
3180  * with the proper table. e.g., enslavement can change and if so the cached
3181  * host route needs to move to the new table.
3182  */
3183 static void l3mdev_check_host_rt(struct inet6_dev *idev,
3184                                   struct inet6_ifaddr *ifp)
3185 {
3186         if (ifp->rt) {
3187                 u32 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
3188
3189                 if (tb_id != ifp->rt->rt6i_table->tb6_id) {
3190                         ip6_del_rt(ifp->rt);
3191                         ifp->rt = NULL;
3192                 }
3193         }
3194 }
3195 #else
3196 static void l3mdev_check_host_rt(struct inet6_dev *idev,
3197                                   struct inet6_ifaddr *ifp)
3198 {
3199 }
3200 #endif
3201
3202 static int fixup_permanent_addr(struct inet6_dev *idev,
3203                                 struct inet6_ifaddr *ifp)
3204 {
3205         l3mdev_check_host_rt(idev, ifp);
3206
3207         if (!ifp->rt) {
3208                 struct rt6_info *rt;
3209
3210                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3211                 if (unlikely(IS_ERR(rt)))
3212                         return PTR_ERR(rt);
3213
3214                 ifp->rt = rt;
3215         }
3216
3217         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3218                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3219                                       idev->dev, 0, 0);
3220         }
3221
3222         addrconf_dad_start(ifp);
3223
3224         return 0;
3225 }
3226
3227 static void addrconf_permanent_addr(struct net_device *dev)
3228 {
3229         struct inet6_ifaddr *ifp, *tmp;
3230         struct inet6_dev *idev;
3231
3232         idev = __in6_dev_get(dev);
3233         if (!idev)
3234                 return;
3235
3236         write_lock_bh(&idev->lock);
3237
3238         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3239                 if ((ifp->flags & IFA_F_PERMANENT) &&
3240                     fixup_permanent_addr(idev, ifp) < 0) {
3241                         write_unlock_bh(&idev->lock);
3242                         ipv6_del_addr(ifp);
3243                         write_lock_bh(&idev->lock);
3244
3245                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3246                                              idev->dev->name, &ifp->addr);
3247                 }
3248         }
3249
3250         write_unlock_bh(&idev->lock);
3251 }
3252
3253 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3254                            void *ptr)
3255 {
3256         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3257         struct inet6_dev *idev = __in6_dev_get(dev);
3258         int run_pending = 0;
3259         int err;
3260
3261         switch (event) {
3262         case NETDEV_REGISTER:
3263                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3264                         idev = ipv6_add_dev(dev);
3265                         if (IS_ERR(idev))
3266                                 return notifier_from_errno(PTR_ERR(idev));
3267                 }
3268                 break;
3269
3270         case NETDEV_CHANGEMTU:
3271                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3272                 if (dev->mtu < IPV6_MIN_MTU) {
3273                         addrconf_ifdown(dev, 1);
3274                         break;
3275                 }
3276
3277                 if (idev) {
3278                         rt6_mtu_change(dev, dev->mtu);
3279                         idev->cnf.mtu6 = dev->mtu;
3280                         break;
3281                 }
3282
3283                 /* allocate new idev */
3284                 idev = ipv6_add_dev(dev);
3285                 if (IS_ERR(idev))
3286                         break;
3287
3288                 /* device is still not ready */
3289                 if (!(idev->if_flags & IF_READY))
3290                         break;
3291
3292                 run_pending = 1;
3293
3294                 /* fall through */
3295
3296         case NETDEV_UP:
3297         case NETDEV_CHANGE:
3298                 if (dev->flags & IFF_SLAVE)
3299                         break;
3300
3301                 if (idev && idev->cnf.disable_ipv6)
3302                         break;
3303
3304                 if (event == NETDEV_UP) {
3305                         if (!addrconf_qdisc_ok(dev)) {
3306                                 /* device is not ready yet. */
3307                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3308                                         dev->name);
3309                                 break;
3310                         }
3311
3312                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3313                                 idev = ipv6_add_dev(dev);
3314
3315                         if (!IS_ERR_OR_NULL(idev)) {
3316                                 idev->if_flags |= IF_READY;
3317                                 run_pending = 1;
3318                         }
3319                 } else if (event == NETDEV_CHANGE) {
3320                         if (!addrconf_qdisc_ok(dev)) {
3321                                 /* device is still not ready. */
3322                                 break;
3323                         }
3324
3325                         if (idev) {
3326                                 if (idev->if_flags & IF_READY)
3327                                         /* device is already configured. */
3328                                         break;
3329                                 idev->if_flags |= IF_READY;
3330                         }
3331
3332                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3333                                 dev->name);
3334
3335                         run_pending = 1;
3336                 }
3337
3338                 /* restore routes for permanent addresses */
3339                 addrconf_permanent_addr(dev);
3340
3341                 switch (dev->type) {
3342 #if IS_ENABLED(CONFIG_IPV6_SIT)
3343                 case ARPHRD_SIT:
3344                         addrconf_sit_config(dev);
3345                         break;
3346 #endif
3347 #if IS_ENABLED(CONFIG_NET_IPGRE)
3348                 case ARPHRD_IPGRE:
3349                         addrconf_gre_config(dev);
3350                         break;
3351 #endif
3352                 case ARPHRD_LOOPBACK:
3353                         init_loopback(dev);
3354                         break;
3355
3356                 default:
3357                         addrconf_dev_config(dev);
3358                         break;
3359                 }
3360
3361                 if (!IS_ERR_OR_NULL(idev)) {
3362                         if (run_pending)
3363                                 addrconf_dad_run(idev);
3364
3365                         /*
3366                          * If the MTU changed during the interface down,
3367                          * when the interface up, the changed MTU must be
3368                          * reflected in the idev as well as routers.
3369                          */
3370                         if (idev->cnf.mtu6 != dev->mtu &&
3371                             dev->mtu >= IPV6_MIN_MTU) {
3372                                 rt6_mtu_change(dev, dev->mtu);
3373                                 idev->cnf.mtu6 = dev->mtu;
3374                         }
3375                         idev->tstamp = jiffies;
3376                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3377
3378                         /*
3379                          * If the changed mtu during down is lower than
3380                          * IPV6_MIN_MTU stop IPv6 on this interface.
3381                          */
3382                         if (dev->mtu < IPV6_MIN_MTU)
3383                                 addrconf_ifdown(dev, 1);
3384                 }
3385                 break;
3386
3387         case NETDEV_DOWN:
3388         case NETDEV_UNREGISTER:
3389                 /*
3390                  *      Remove all addresses from this interface.
3391                  */
3392                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3393                 break;
3394
3395         case NETDEV_CHANGENAME:
3396                 if (idev) {
3397                         snmp6_unregister_dev(idev);
3398                         addrconf_sysctl_unregister(idev);
3399                         err = addrconf_sysctl_register(idev);
3400                         if (err)
3401                                 return notifier_from_errno(err);
3402                         err = snmp6_register_dev(idev);
3403                         if (err) {
3404                                 addrconf_sysctl_unregister(idev);
3405                                 return notifier_from_errno(err);
3406                         }
3407                 }
3408                 break;
3409
3410         case NETDEV_PRE_TYPE_CHANGE:
3411         case NETDEV_POST_TYPE_CHANGE:
3412                 if (idev)
3413                         addrconf_type_change(dev, event);
3414                 break;
3415         }
3416
3417         return NOTIFY_OK;
3418 }
3419
3420 /*
3421  *      addrconf module should be notified of a device going up
3422  */
3423 static struct notifier_block ipv6_dev_notf = {
3424         .notifier_call = addrconf_notify,
3425 };
3426
3427 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3428 {
3429         struct inet6_dev *idev;
3430         ASSERT_RTNL();
3431
3432         idev = __in6_dev_get(dev);
3433
3434         if (event == NETDEV_POST_TYPE_CHANGE)
3435                 ipv6_mc_remap(idev);
3436         else if (event == NETDEV_PRE_TYPE_CHANGE)
3437                 ipv6_mc_unmap(idev);
3438 }
3439
3440 static int addrconf_ifdown(struct net_device *dev, int how)
3441 {
3442         struct net *net = dev_net(dev);
3443         struct inet6_dev *idev;
3444         struct inet6_ifaddr *ifa, *tmp;
3445         struct list_head del_list;
3446         int _keep_addr;
3447         bool keep_addr;
3448         int state, i;
3449
3450         ASSERT_RTNL();
3451
3452         rt6_ifdown(net, dev);
3453         neigh_ifdown(&nd_tbl, dev);
3454
3455         idev = __in6_dev_get(dev);
3456         if (!idev)
3457                 return -ENODEV;
3458
3459         /*
3460          * Step 1: remove reference to ipv6 device from parent device.
3461          *         Do not dev_put!
3462          */
3463         if (how) {
3464                 idev->dead = 1;
3465
3466                 /* protected by rtnl_lock */
3467                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3468
3469                 /* Step 1.5: remove snmp6 entry */
3470                 snmp6_unregister_dev(idev);
3471
3472         }
3473
3474         /* aggregate the system setting and interface setting */
3475         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3476         if (!_keep_addr)
3477                 _keep_addr = idev->cnf.keep_addr_on_down;
3478
3479         /* combine the user config with event to determine if permanent
3480          * addresses are to be removed from address hash table
3481          */
3482         keep_addr = !(how || _keep_addr <= 0);
3483
3484         /* Step 2: clear hash table */
3485         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3486                 struct hlist_head *h = &inet6_addr_lst[i];
3487
3488                 spin_lock_bh(&addrconf_hash_lock);
3489 restart:
3490                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3491                         if (ifa->idev == idev) {
3492                                 addrconf_del_dad_work(ifa);
3493                                 /* combined flag + permanent flag decide if
3494                                  * address is retained on a down event
3495                                  */
3496                                 if (!keep_addr ||
3497                                     !(ifa->flags & IFA_F_PERMANENT)) {
3498                                         hlist_del_init_rcu(&ifa->addr_lst);
3499                                         goto restart;
3500                                 }
3501                         }
3502                 }
3503                 spin_unlock_bh(&addrconf_hash_lock);
3504         }
3505
3506         write_lock_bh(&idev->lock);
3507
3508         addrconf_del_rs_timer(idev);
3509
3510         /* Step 2: clear flags for stateless addrconf */
3511         if (!how)
3512                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3513
3514         if (how && del_timer(&idev->regen_timer))
3515                 in6_dev_put(idev);
3516
3517         /* Step 3: clear tempaddr list */
3518         while (!list_empty(&idev->tempaddr_list)) {
3519                 ifa = list_first_entry(&idev->tempaddr_list,
3520                                        struct inet6_ifaddr, tmp_list);
3521                 list_del(&ifa->tmp_list);
3522                 write_unlock_bh(&idev->lock);
3523                 spin_lock_bh(&ifa->lock);
3524
3525                 if (ifa->ifpub) {
3526                         in6_ifa_put(ifa->ifpub);
3527                         ifa->ifpub = NULL;
3528                 }
3529                 spin_unlock_bh(&ifa->lock);
3530                 in6_ifa_put(ifa);
3531                 write_lock_bh(&idev->lock);
3532         }
3533
3534         /* re-combine the user config with event to determine if permanent
3535          * addresses are to be removed from the interface list
3536          */
3537         keep_addr = (!how && _keep_addr > 0);
3538
3539         INIT_LIST_HEAD(&del_list);
3540         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3541                 addrconf_del_dad_work(ifa);
3542
3543                 write_unlock_bh(&idev->lock);
3544                 spin_lock_bh(&ifa->lock);
3545
3546                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT)) {
3547                         /* set state to skip the notifier below */
3548                         state = INET6_IFADDR_STATE_DEAD;
3549                         ifa->state = 0;
3550                         if (!(ifa->flags & IFA_F_NODAD))
3551                                 ifa->flags |= IFA_F_TENTATIVE;
3552                 } else {
3553                         state = ifa->state;
3554                         ifa->state = INET6_IFADDR_STATE_DEAD;
3555
3556                         list_del(&ifa->if_list);
3557                         list_add(&ifa->if_list, &del_list);
3558                 }
3559
3560                 spin_unlock_bh(&ifa->lock);
3561
3562                 if (state != INET6_IFADDR_STATE_DEAD) {
3563                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3564                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3565                 }
3566
3567                 write_lock_bh(&idev->lock);
3568         }
3569
3570         write_unlock_bh(&idev->lock);
3571
3572         /* now clean up addresses to be removed */
3573         while (!list_empty(&del_list)) {
3574                 ifa = list_first_entry(&del_list,
3575                                        struct inet6_ifaddr, if_list);
3576                 list_del(&ifa->if_list);
3577
3578                 in6_ifa_put(ifa);
3579         }
3580
3581         /* Step 5: Discard anycast and multicast list */
3582         if (how) {
3583                 ipv6_ac_destroy_dev(idev);
3584                 ipv6_mc_destroy_dev(idev);
3585         } else {
3586                 ipv6_mc_down(idev);
3587         }
3588
3589         idev->tstamp = jiffies;
3590
3591         /* Last: Shot the device (if unregistered) */
3592         if (how) {
3593                 addrconf_sysctl_unregister(idev);
3594                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3595                 neigh_ifdown(&nd_tbl, dev);
3596                 in6_dev_put(idev);
3597         }
3598         return 0;
3599 }
3600
3601 static void addrconf_rs_timer(unsigned long data)
3602 {
3603         struct inet6_dev *idev = (struct inet6_dev *)data;
3604         struct net_device *dev = idev->dev;
3605         struct in6_addr lladdr;
3606
3607         write_lock(&idev->lock);
3608         if (idev->dead || !(idev->if_flags & IF_READY))
3609                 goto out;
3610
3611         if (!ipv6_accept_ra(idev))
3612                 goto out;
3613
3614         /* Announcement received after solicitation was sent */
3615         if (idev->if_flags & IF_RA_RCVD)
3616                 goto out;
3617
3618         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3619                 write_unlock(&idev->lock);
3620                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3621                         ndisc_send_rs(dev, &lladdr,
3622                                       &in6addr_linklocal_allrouters);
3623                 else
3624                         goto put;
3625
3626                 write_lock(&idev->lock);
3627                 /* The wait after the last probe can be shorter */
3628                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3629                                              idev->cnf.rtr_solicits) ?
3630                                       idev->cnf.rtr_solicit_delay :
3631                                       idev->cnf.rtr_solicit_interval);
3632         } else {
3633                 /*
3634                  * Note: we do not support deprecated "all on-link"
3635                  * assumption any longer.
3636                  */
3637                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3638         }
3639
3640 out:
3641         write_unlock(&idev->lock);
3642 put:
3643         in6_dev_put(idev);
3644 }
3645
3646 /*
3647  *      Duplicate Address Detection
3648  */
3649 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3650 {
3651         unsigned long rand_num;
3652         struct inet6_dev *idev = ifp->idev;
3653
3654         if (ifp->flags & IFA_F_OPTIMISTIC)
3655                 rand_num = 0;
3656         else
3657                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3658
3659         ifp->dad_probes = idev->cnf.dad_transmits;
3660         addrconf_mod_dad_work(ifp, rand_num);
3661 }
3662
3663 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3664 {
3665         struct inet6_dev *idev = ifp->idev;
3666         struct net_device *dev = idev->dev;
3667         bool notify = false;
3668
3669         addrconf_join_solict(dev, &ifp->addr);
3670
3671         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3672
3673         read_lock_bh(&idev->lock);
3674         spin_lock(&ifp->lock);
3675         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3676                 goto out;
3677
3678         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3679             idev->cnf.accept_dad < 1 ||
3680             !(ifp->flags&IFA_F_TENTATIVE) ||
3681             ifp->flags & IFA_F_NODAD) {
3682                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3683                 spin_unlock(&ifp->lock);
3684                 read_unlock_bh(&idev->lock);
3685
3686                 addrconf_dad_completed(ifp);
3687                 return;
3688         }
3689
3690         if (!(idev->if_flags & IF_READY)) {
3691                 spin_unlock(&ifp->lock);
3692                 read_unlock_bh(&idev->lock);
3693                 /*
3694                  * If the device is not ready:
3695                  * - keep it tentative if it is a permanent address.
3696                  * - otherwise, kill it.
3697                  */
3698                 in6_ifa_hold(ifp);
3699                 addrconf_dad_stop(ifp, 0);
3700                 return;
3701         }
3702
3703         /*
3704          * Optimistic nodes can start receiving
3705          * Frames right away
3706          */
3707         if (ifp->flags & IFA_F_OPTIMISTIC) {
3708                 ip6_ins_rt(ifp->rt);
3709                 if (ipv6_use_optimistic_addr(idev)) {
3710                         /* Because optimistic nodes can use this address,
3711                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3712                          */
3713                         notify = true;
3714                 }
3715         }
3716
3717         addrconf_dad_kick(ifp);
3718 out:
3719         spin_unlock(&ifp->lock);
3720         read_unlock_bh(&idev->lock);
3721         if (notify)
3722                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3723 }
3724
3725 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3726 {
3727         bool begin_dad = false;
3728
3729         spin_lock_bh(&ifp->lock);
3730         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3731                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3732                 begin_dad = true;
3733         }
3734         spin_unlock_bh(&ifp->lock);
3735
3736         if (begin_dad)
3737                 addrconf_mod_dad_work(ifp, 0);
3738 }
3739
3740 static void addrconf_dad_work(struct work_struct *w)
3741 {
3742         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3743                                                 struct inet6_ifaddr,
3744                                                 dad_work);
3745         struct inet6_dev *idev = ifp->idev;
3746         struct in6_addr mcaddr;
3747
3748         enum {
3749                 DAD_PROCESS,
3750                 DAD_BEGIN,
3751                 DAD_ABORT,
3752         } action = DAD_PROCESS;
3753
3754         rtnl_lock();
3755
3756         spin_lock_bh(&ifp->lock);
3757         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3758                 action = DAD_BEGIN;
3759                 ifp->state = INET6_IFADDR_STATE_DAD;
3760         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3761                 action = DAD_ABORT;
3762                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3763         }
3764         spin_unlock_bh(&ifp->lock);
3765
3766         if (action == DAD_BEGIN) {
3767                 addrconf_dad_begin(ifp);
3768                 goto out;
3769         } else if (action == DAD_ABORT) {
3770                 addrconf_dad_stop(ifp, 1);
3771                 goto out;
3772         }
3773
3774         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3775                 goto out;
3776
3777         write_lock_bh(&idev->lock);
3778         if (idev->dead || !(idev->if_flags & IF_READY)) {
3779                 write_unlock_bh(&idev->lock);
3780                 goto out;
3781         }
3782
3783         spin_lock(&ifp->lock);
3784         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3785                 spin_unlock(&ifp->lock);
3786                 write_unlock_bh(&idev->lock);
3787                 goto out;
3788         }
3789
3790         if (ifp->dad_probes == 0) {
3791                 /*
3792                  * DAD was successful
3793                  */
3794
3795                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3796                 spin_unlock(&ifp->lock);
3797                 write_unlock_bh(&idev->lock);
3798
3799                 addrconf_dad_completed(ifp);
3800
3801                 goto out;
3802         }
3803
3804         ifp->dad_probes--;
3805         addrconf_mod_dad_work(ifp,
3806                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3807         spin_unlock(&ifp->lock);
3808         write_unlock_bh(&idev->lock);
3809
3810         /* send a neighbour solicitation for our addr */
3811         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3812         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3813 out:
3814         in6_ifa_put(ifp);
3815         rtnl_unlock();
3816 }
3817
3818 /* ifp->idev must be at least read locked */
3819 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3820 {
3821         struct inet6_ifaddr *ifpiter;
3822         struct inet6_dev *idev = ifp->idev;
3823
3824         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3825                 if (ifpiter->scope > IFA_LINK)
3826                         break;
3827                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3828                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3829                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3830                     IFA_F_PERMANENT)
3831                         return false;
3832         }
3833         return true;
3834 }
3835
3836 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3837 {
3838         struct net_device *dev = ifp->idev->dev;
3839         struct in6_addr lladdr;
3840         bool send_rs, send_mld;
3841
3842         addrconf_del_dad_work(ifp);
3843
3844         /*
3845          *      Configure the address for reception. Now it is valid.
3846          */
3847
3848         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3849
3850         /* If added prefix is link local and we are prepared to process
3851            router advertisements, start sending router solicitations.
3852          */
3853
3854         read_lock_bh(&ifp->idev->lock);
3855         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3856         send_rs = send_mld &&
3857                   ipv6_accept_ra(ifp->idev) &&
3858                   ifp->idev->cnf.rtr_solicits > 0 &&
3859                   (dev->flags&IFF_LOOPBACK) == 0;
3860         read_unlock_bh(&ifp->idev->lock);
3861
3862         /* While dad is in progress mld report's source address is in6_addrany.
3863          * Resend with proper ll now.
3864          */
3865         if (send_mld)
3866                 ipv6_mc_dad_complete(ifp->idev);
3867
3868         if (send_rs) {
3869                 /*
3870                  *      If a host as already performed a random delay
3871                  *      [...] as part of DAD [...] there is no need
3872                  *      to delay again before sending the first RS
3873                  */
3874                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3875                         return;
3876                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3877
3878                 write_lock_bh(&ifp->idev->lock);
3879                 spin_lock(&ifp->lock);
3880                 ifp->idev->rs_probes = 1;
3881                 ifp->idev->if_flags |= IF_RS_SENT;
3882                 addrconf_mod_rs_timer(ifp->idev,
3883                                       ifp->idev->cnf.rtr_solicit_interval);
3884                 spin_unlock(&ifp->lock);
3885                 write_unlock_bh(&ifp->idev->lock);
3886         }
3887 }
3888
3889 static void addrconf_dad_run(struct inet6_dev *idev)
3890 {
3891         struct inet6_ifaddr *ifp;
3892
3893         read_lock_bh(&idev->lock);
3894         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3895                 spin_lock(&ifp->lock);
3896                 if (ifp->flags & IFA_F_TENTATIVE &&
3897                     ifp->state == INET6_IFADDR_STATE_DAD)
3898                         addrconf_dad_kick(ifp);
3899                 spin_unlock(&ifp->lock);
3900         }
3901         read_unlock_bh(&idev->lock);
3902 }
3903
3904 #ifdef CONFIG_PROC_FS
3905 struct if6_iter_state {
3906         struct seq_net_private p;
3907         int bucket;
3908         int offset;
3909 };
3910
3911 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3912 {
3913         struct inet6_ifaddr *ifa = NULL;
3914         struct if6_iter_state *state = seq->private;
3915         struct net *net = seq_file_net(seq);
3916         int p = 0;
3917
3918         /* initial bucket if pos is 0 */
3919         if (pos == 0) {
3920                 state->bucket = 0;
3921                 state->offset = 0;
3922         }
3923
3924         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3925                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3926                                          addr_lst) {
3927                         if (!net_eq(dev_net(ifa->idev->dev), net))
3928                                 continue;
3929                         /* sync with offset */
3930                         if (p < state->offset) {
3931                                 p++;
3932                                 continue;
3933                         }
3934                         state->offset++;
3935                         return ifa;
3936                 }
3937
3938                 /* prepare for next bucket */
3939                 state->offset = 0;
3940                 p = 0;
3941         }
3942         return NULL;
3943 }
3944
3945 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3946                                          struct inet6_ifaddr *ifa)
3947 {
3948         struct if6_iter_state *state = seq->private;
3949         struct net *net = seq_file_net(seq);
3950
3951         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3952                 if (!net_eq(dev_net(ifa->idev->dev), net))
3953                         continue;
3954                 state->offset++;
3955                 return ifa;
3956         }
3957
3958         while (++state->bucket < IN6_ADDR_HSIZE) {
3959                 state->offset = 0;
3960                 hlist_for_each_entry_rcu_bh(ifa,
3961                                      &inet6_addr_lst[state->bucket], addr_lst) {
3962                         if (!net_eq(dev_net(ifa->idev->dev), net))
3963                                 continue;
3964                         state->offset++;
3965                         return ifa;
3966                 }
3967         }
3968
3969         return NULL;
3970 }
3971
3972 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3973         __acquires(rcu_bh)
3974 {
3975         rcu_read_lock_bh();
3976         return if6_get_first(seq, *pos);
3977 }
3978
3979 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3980 {
3981         struct inet6_ifaddr *ifa;
3982
3983         ifa = if6_get_next(seq, v);
3984         ++*pos;
3985         return ifa;
3986 }
3987
3988 static void if6_seq_stop(struct seq_file *seq, void *v)
3989         __releases(rcu_bh)
3990 {
3991         rcu_read_unlock_bh();
3992 }
3993
3994 static int if6_seq_show(struct seq_file *seq, void *v)
3995 {
3996         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3997         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3998                    &ifp->addr,
3999                    ifp->idev->dev->ifindex,
4000                    ifp->prefix_len,
4001                    ifp->scope,
4002                    (u8) ifp->flags,
4003                    ifp->idev->dev->name);
4004         return 0;
4005 }
4006
4007 static const struct seq_operations if6_seq_ops = {
4008         .start  = if6_seq_start,
4009         .next   = if6_seq_next,
4010         .show   = if6_seq_show,
4011         .stop   = if6_seq_stop,
4012 };
4013
4014 static int if6_seq_open(struct inode *inode, struct file *file)
4015 {
4016         return seq_open_net(inode, file, &if6_seq_ops,
4017                             sizeof(struct if6_iter_state));
4018 }
4019
4020 static const struct file_operations if6_fops = {
4021         .owner          = THIS_MODULE,
4022         .open           = if6_seq_open,
4023         .read           = seq_read,
4024         .llseek         = seq_lseek,
4025         .release        = seq_release_net,
4026 };
4027
4028 static int __net_init if6_proc_net_init(struct net *net)
4029 {
4030         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4031                 return -ENOMEM;
4032         return 0;
4033 }
4034
4035 static void __net_exit if6_proc_net_exit(struct net *net)
4036 {
4037         remove_proc_entry("if_inet6", net->proc_net);
4038 }
4039
4040 static struct pernet_operations if6_proc_net_ops = {
4041         .init = if6_proc_net_init,
4042         .exit = if6_proc_net_exit,
4043 };
4044
4045 int __init if6_proc_init(void)
4046 {
4047         return register_pernet_subsys(&if6_proc_net_ops);
4048 }
4049
4050 void if6_proc_exit(void)
4051 {
4052         unregister_pernet_subsys(&if6_proc_net_ops);
4053 }
4054 #endif  /* CONFIG_PROC_FS */
4055
4056 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4057 /* Check if address is a home address configured on any interface. */
4058 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4059 {
4060         int ret = 0;
4061         struct inet6_ifaddr *ifp = NULL;
4062         unsigned int hash = inet6_addr_hash(addr);
4063
4064         rcu_read_lock_bh();
4065         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4066                 if (!net_eq(dev_net(ifp->idev->dev), net))
4067                         continue;
4068                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4069                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4070                         ret = 1;
4071                         break;
4072                 }
4073         }
4074         rcu_read_unlock_bh();
4075         return ret;
4076 }
4077 #endif
4078
4079 /*
4080  *      Periodic address status verification
4081  */
4082
4083 static void addrconf_verify_rtnl(void)
4084 {
4085         unsigned long now, next, next_sec, next_sched;
4086         struct inet6_ifaddr *ifp;
4087         int i;
4088
4089         ASSERT_RTNL();
4090
4091         rcu_read_lock_bh();
4092         now = jiffies;
4093         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4094
4095         cancel_delayed_work(&addr_chk_work);
4096
4097         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4098 restart:
4099                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4100                         unsigned long age;
4101
4102                         /* When setting preferred_lft to a value not zero or
4103                          * infinity, while valid_lft is infinity
4104                          * IFA_F_PERMANENT has a non-infinity life time.
4105                          */
4106                         if ((ifp->flags & IFA_F_PERMANENT) &&
4107                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4108                                 continue;
4109
4110                         spin_lock(&ifp->lock);
4111                         /* We try to batch several events at once. */
4112                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4113
4114                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4115                             age >= ifp->valid_lft) {
4116                                 spin_unlock(&ifp->lock);
4117                                 in6_ifa_hold(ifp);
4118                                 ipv6_del_addr(ifp);
4119                                 goto restart;
4120                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4121                                 spin_unlock(&ifp->lock);
4122                                 continue;
4123                         } else if (age >= ifp->prefered_lft) {
4124                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4125                                 int deprecate = 0;
4126
4127                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4128                                         deprecate = 1;
4129                                         ifp->flags |= IFA_F_DEPRECATED;
4130                                 }
4131
4132                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4133                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4134                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4135
4136                                 spin_unlock(&ifp->lock);
4137
4138                                 if (deprecate) {
4139                                         in6_ifa_hold(ifp);
4140
4141                                         ipv6_ifa_notify(0, ifp);
4142                                         in6_ifa_put(ifp);
4143                                         goto restart;
4144                                 }
4145                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4146                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4147                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4148                                         ifp->idev->cnf.dad_transmits *
4149                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4150
4151                                 if (age >= ifp->prefered_lft - regen_advance) {
4152                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4153                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4154                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4155                                         if (!ifp->regen_count && ifpub) {
4156                                                 ifp->regen_count++;
4157                                                 in6_ifa_hold(ifp);
4158                                                 in6_ifa_hold(ifpub);
4159                                                 spin_unlock(&ifp->lock);
4160
4161                                                 spin_lock(&ifpub->lock);
4162                                                 ifpub->regen_count = 0;
4163                                                 spin_unlock(&ifpub->lock);
4164                                                 ipv6_create_tempaddr(ifpub, ifp);
4165                                                 in6_ifa_put(ifpub);
4166                                                 in6_ifa_put(ifp);
4167                                                 goto restart;
4168                                         }
4169                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4170                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4171                                 spin_unlock(&ifp->lock);
4172                         } else {
4173                                 /* ifp->prefered_lft <= ifp->valid_lft */
4174                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4175                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4176                                 spin_unlock(&ifp->lock);
4177                         }
4178                 }
4179         }
4180
4181         next_sec = round_jiffies_up(next);
4182         next_sched = next;
4183
4184         /* If rounded timeout is accurate enough, accept it. */
4185         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4186                 next_sched = next_sec;
4187
4188         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4189         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4190                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4191
4192         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4193               now, next, next_sec, next_sched);
4194         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4195         rcu_read_unlock_bh();
4196 }
4197
4198 static void addrconf_verify_work(struct work_struct *w)
4199 {
4200         rtnl_lock();
4201         addrconf_verify_rtnl();
4202         rtnl_unlock();
4203 }
4204
4205 static void addrconf_verify(void)
4206 {
4207         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4208 }
4209
4210 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4211                                      struct in6_addr **peer_pfx)
4212 {
4213         struct in6_addr *pfx = NULL;
4214
4215         *peer_pfx = NULL;
4216
4217         if (addr)
4218                 pfx = nla_data(addr);
4219
4220         if (local) {
4221                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4222                         *peer_pfx = pfx;
4223                 pfx = nla_data(local);
4224         }
4225
4226         return pfx;
4227 }
4228
4229 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4230         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4231         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4232         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4233         [IFA_FLAGS]             = { .len = sizeof(u32) },
4234 };
4235
4236 static int
4237 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4238 {
4239         struct net *net = sock_net(skb->sk);
4240         struct ifaddrmsg *ifm;
4241         struct nlattr *tb[IFA_MAX+1];
4242         struct in6_addr *pfx, *peer_pfx;
4243         u32 ifa_flags;
4244         int err;
4245
4246         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4247         if (err < 0)
4248                 return err;
4249
4250         ifm = nlmsg_data(nlh);
4251         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4252         if (!pfx)
4253                 return -EINVAL;
4254
4255         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4256
4257         /* We ignore other flags so far. */
4258         ifa_flags &= IFA_F_MANAGETEMPADDR;
4259
4260         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4261                               ifm->ifa_prefixlen);
4262 }
4263
4264 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4265                              u32 prefered_lft, u32 valid_lft)
4266 {
4267         u32 flags;
4268         clock_t expires;
4269         unsigned long timeout;
4270         bool was_managetempaddr;
4271         bool had_prefixroute;
4272
4273         ASSERT_RTNL();
4274
4275         if (!valid_lft || (prefered_lft > valid_lft))
4276                 return -EINVAL;
4277
4278         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4279             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4280                 return -EINVAL;
4281
4282         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4283         if (addrconf_finite_timeout(timeout)) {
4284                 expires = jiffies_to_clock_t(timeout * HZ);
4285                 valid_lft = timeout;
4286                 flags = RTF_EXPIRES;
4287         } else {
4288                 expires = 0;
4289                 flags = 0;
4290                 ifa_flags |= IFA_F_PERMANENT;
4291         }
4292
4293         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4294         if (addrconf_finite_timeout(timeout)) {
4295                 if (timeout == 0)
4296                         ifa_flags |= IFA_F_DEPRECATED;
4297                 prefered_lft = timeout;
4298         }
4299
4300         spin_lock_bh(&ifp->lock);
4301         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4302         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4303                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4304         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4305                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4306                         IFA_F_NOPREFIXROUTE);
4307         ifp->flags |= ifa_flags;
4308         ifp->tstamp = jiffies;
4309         ifp->valid_lft = valid_lft;
4310         ifp->prefered_lft = prefered_lft;
4311
4312         spin_unlock_bh(&ifp->lock);
4313         if (!(ifp->flags&IFA_F_TENTATIVE))
4314                 ipv6_ifa_notify(0, ifp);
4315
4316         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4317                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4318                                       expires, flags);
4319         } else if (had_prefixroute) {
4320                 enum cleanup_prefix_rt_t action;
4321                 unsigned long rt_expires;
4322
4323                 write_lock_bh(&ifp->idev->lock);
4324                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4325                 write_unlock_bh(&ifp->idev->lock);
4326
4327                 if (action != CLEANUP_PREFIX_RT_NOP) {
4328                         cleanup_prefix_route(ifp, rt_expires,
4329                                 action == CLEANUP_PREFIX_RT_DEL);
4330                 }
4331         }
4332
4333         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4334                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4335                         valid_lft = prefered_lft = 0;
4336                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4337                                  !was_managetempaddr, jiffies);
4338         }
4339
4340         addrconf_verify_rtnl();
4341
4342         return 0;
4343 }
4344
4345 static int
4346 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4347 {
4348         struct net *net = sock_net(skb->sk);
4349         struct ifaddrmsg *ifm;
4350         struct nlattr *tb[IFA_MAX+1];
4351         struct in6_addr *pfx, *peer_pfx;
4352         struct inet6_ifaddr *ifa;
4353         struct net_device *dev;
4354         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4355         u32 ifa_flags;
4356         int err;
4357
4358         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4359         if (err < 0)
4360                 return err;
4361
4362         ifm = nlmsg_data(nlh);
4363         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4364         if (!pfx)
4365                 return -EINVAL;
4366
4367         if (tb[IFA_CACHEINFO]) {
4368                 struct ifa_cacheinfo *ci;
4369
4370                 ci = nla_data(tb[IFA_CACHEINFO]);
4371                 valid_lft = ci->ifa_valid;
4372                 preferred_lft = ci->ifa_prefered;
4373         } else {
4374                 preferred_lft = INFINITY_LIFE_TIME;
4375                 valid_lft = INFINITY_LIFE_TIME;
4376         }
4377
4378         dev =  __dev_get_by_index(net, ifm->ifa_index);
4379         if (!dev)
4380                 return -ENODEV;
4381
4382         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4383
4384         /* We ignore other flags so far. */
4385         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4386                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4387
4388         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4389         if (!ifa) {
4390                 /*
4391                  * It would be best to check for !NLM_F_CREATE here but
4392                  * userspace already relies on not having to provide this.
4393                  */
4394                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4395                                       ifm->ifa_prefixlen, ifa_flags,
4396                                       preferred_lft, valid_lft);
4397         }
4398
4399         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4400             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4401                 err = -EEXIST;
4402         else
4403                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4404
4405         in6_ifa_put(ifa);
4406
4407         return err;
4408 }
4409
4410 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4411                           u8 scope, int ifindex)
4412 {
4413         struct ifaddrmsg *ifm;
4414
4415         ifm = nlmsg_data(nlh);
4416         ifm->ifa_family = AF_INET6;
4417         ifm->ifa_prefixlen = prefixlen;
4418         ifm->ifa_flags = flags;
4419         ifm->ifa_scope = scope;
4420         ifm->ifa_index = ifindex;
4421 }
4422
4423 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4424                          unsigned long tstamp, u32 preferred, u32 valid)
4425 {
4426         struct ifa_cacheinfo ci;
4427
4428         ci.cstamp = cstamp_delta(cstamp);
4429         ci.tstamp = cstamp_delta(tstamp);
4430         ci.ifa_prefered = preferred;
4431         ci.ifa_valid = valid;
4432
4433         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4434 }
4435
4436 static inline int rt_scope(int ifa_scope)
4437 {
4438         if (ifa_scope & IFA_HOST)
4439                 return RT_SCOPE_HOST;
4440         else if (ifa_scope & IFA_LINK)
4441                 return RT_SCOPE_LINK;
4442         else if (ifa_scope & IFA_SITE)
4443                 return RT_SCOPE_SITE;
4444         else
4445                 return RT_SCOPE_UNIVERSE;
4446 }
4447
4448 static inline int inet6_ifaddr_msgsize(void)
4449 {
4450         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4451                + nla_total_size(16) /* IFA_LOCAL */
4452                + nla_total_size(16) /* IFA_ADDRESS */
4453                + nla_total_size(sizeof(struct ifa_cacheinfo))
4454                + nla_total_size(4)  /* IFA_FLAGS */;
4455 }
4456
4457 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4458                              u32 portid, u32 seq, int event, unsigned int flags)
4459 {
4460         struct nlmsghdr  *nlh;
4461         u32 preferred, valid;
4462
4463         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4464         if (!nlh)
4465                 return -EMSGSIZE;
4466
4467         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4468                       ifa->idev->dev->ifindex);
4469
4470         if (!((ifa->flags&IFA_F_PERMANENT) &&
4471               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4472                 preferred = ifa->prefered_lft;
4473                 valid = ifa->valid_lft;
4474                 if (preferred != INFINITY_LIFE_TIME) {
4475                         long tval = (jiffies - ifa->tstamp)/HZ;
4476                         if (preferred > tval)
4477                                 preferred -= tval;
4478                         else
4479                                 preferred = 0;
4480                         if (valid != INFINITY_LIFE_TIME) {
4481                                 if (valid > tval)
4482                                         valid -= tval;
4483                                 else
4484                                         valid = 0;
4485                         }
4486                 }
4487         } else {
4488                 preferred = INFINITY_LIFE_TIME;
4489                 valid = INFINITY_LIFE_TIME;
4490         }
4491
4492         if (!ipv6_addr_any(&ifa->peer_addr)) {
4493                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4494                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4495                         goto error;
4496         } else
4497                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4498                         goto error;
4499
4500         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4501                 goto error;
4502
4503         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4504                 goto error;
4505
4506         nlmsg_end(skb, nlh);
4507         return 0;
4508
4509 error:
4510         nlmsg_cancel(skb, nlh);
4511         return -EMSGSIZE;
4512 }
4513
4514 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4515                                 u32 portid, u32 seq, int event, u16 flags)
4516 {
4517         struct nlmsghdr  *nlh;
4518         u8 scope = RT_SCOPE_UNIVERSE;
4519         int ifindex = ifmca->idev->dev->ifindex;
4520
4521         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4522                 scope = RT_SCOPE_SITE;
4523
4524         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4525         if (!nlh)
4526                 return -EMSGSIZE;
4527
4528         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4529         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4530             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4531                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4532                 nlmsg_cancel(skb, nlh);
4533                 return -EMSGSIZE;
4534         }
4535
4536         nlmsg_end(skb, nlh);
4537         return 0;
4538 }
4539
4540 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4541                                 u32 portid, u32 seq, int event, unsigned int flags)
4542 {
4543         struct nlmsghdr  *nlh;
4544         u8 scope = RT_SCOPE_UNIVERSE;
4545         int ifindex = ifaca->aca_idev->dev->ifindex;
4546
4547         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4548                 scope = RT_SCOPE_SITE;
4549
4550         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4551         if (!nlh)
4552                 return -EMSGSIZE;
4553
4554         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4555         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4556             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4557                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4558                 nlmsg_cancel(skb, nlh);
4559                 return -EMSGSIZE;
4560         }
4561
4562         nlmsg_end(skb, nlh);
4563         return 0;
4564 }
4565
4566 enum addr_type_t {
4567         UNICAST_ADDR,
4568         MULTICAST_ADDR,
4569         ANYCAST_ADDR,
4570 };
4571
4572 /* called with rcu_read_lock() */
4573 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4574                           struct netlink_callback *cb, enum addr_type_t type,
4575                           int s_ip_idx, int *p_ip_idx)
4576 {
4577         struct ifmcaddr6 *ifmca;
4578         struct ifacaddr6 *ifaca;
4579         int err = 1;
4580         int ip_idx = *p_ip_idx;
4581
4582         read_lock_bh(&idev->lock);
4583         switch (type) {
4584         case UNICAST_ADDR: {
4585                 struct inet6_ifaddr *ifa;
4586
4587                 /* unicast address incl. temp addr */
4588                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4589                         if (++ip_idx < s_ip_idx)
4590                                 continue;
4591                         err = inet6_fill_ifaddr(skb, ifa,
4592                                                 NETLINK_CB(cb->skb).portid,
4593                                                 cb->nlh->nlmsg_seq,
4594                                                 RTM_NEWADDR,
4595                                                 NLM_F_MULTI);
4596                         if (err < 0)
4597                                 break;
4598                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4599                 }
4600                 break;
4601         }
4602         case MULTICAST_ADDR:
4603                 /* multicast address */
4604                 for (ifmca = idev->mc_list; ifmca;
4605                      ifmca = ifmca->next, ip_idx++) {
4606                         if (ip_idx < s_ip_idx)
4607                                 continue;
4608                         err = inet6_fill_ifmcaddr(skb, ifmca,
4609                                                   NETLINK_CB(cb->skb).portid,
4610                                                   cb->nlh->nlmsg_seq,
4611                                                   RTM_GETMULTICAST,
4612                                                   NLM_F_MULTI);
4613                         if (err < 0)
4614                                 break;
4615                 }
4616                 break;
4617         case ANYCAST_ADDR:
4618                 /* anycast address */
4619                 for (ifaca = idev->ac_list; ifaca;
4620                      ifaca = ifaca->aca_next, ip_idx++) {
4621                         if (ip_idx < s_ip_idx)
4622                                 continue;
4623                         err = inet6_fill_ifacaddr(skb, ifaca,
4624                                                   NETLINK_CB(cb->skb).portid,
4625                                                   cb->nlh->nlmsg_seq,
4626                                                   RTM_GETANYCAST,
4627                                                   NLM_F_MULTI);
4628                         if (err < 0)
4629                                 break;
4630                 }
4631                 break;
4632         default:
4633                 break;
4634         }
4635         read_unlock_bh(&idev->lock);
4636         *p_ip_idx = ip_idx;
4637         return err;
4638 }
4639
4640 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4641                            enum addr_type_t type)
4642 {
4643         struct net *net = sock_net(skb->sk);
4644         int h, s_h;
4645         int idx, ip_idx;
4646         int s_idx, s_ip_idx;
4647         struct net_device *dev;
4648         struct inet6_dev *idev;
4649         struct hlist_head *head;
4650
4651         s_h = cb->args[0];
4652         s_idx = idx = cb->args[1];
4653         s_ip_idx = ip_idx = cb->args[2];
4654
4655         rcu_read_lock();
4656         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4657         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4658                 idx = 0;
4659                 head = &net->dev_index_head[h];
4660                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4661                         if (idx < s_idx)
4662                                 goto cont;
4663                         if (h > s_h || idx > s_idx)
4664                                 s_ip_idx = 0;
4665                         ip_idx = 0;
4666                         idev = __in6_dev_get(dev);
4667                         if (!idev)
4668                                 goto cont;
4669
4670                         if (in6_dump_addrs(idev, skb, cb, type,
4671                                            s_ip_idx, &ip_idx) < 0)
4672                                 goto done;
4673 cont:
4674                         idx++;
4675                 }
4676         }
4677 done:
4678         rcu_read_unlock();
4679         cb->args[0] = h;
4680         cb->args[1] = idx;
4681         cb->args[2] = ip_idx;
4682
4683         return skb->len;
4684 }
4685
4686 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4687 {
4688         enum addr_type_t type = UNICAST_ADDR;
4689
4690         return inet6_dump_addr(skb, cb, type);
4691 }
4692
4693 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4694 {
4695         enum addr_type_t type = MULTICAST_ADDR;
4696
4697         return inet6_dump_addr(skb, cb, type);
4698 }
4699
4700
4701 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4702 {
4703         enum addr_type_t type = ANYCAST_ADDR;
4704
4705         return inet6_dump_addr(skb, cb, type);
4706 }
4707
4708 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4709 {
4710         struct net *net = sock_net(in_skb->sk);
4711         struct ifaddrmsg *ifm;
4712         struct nlattr *tb[IFA_MAX+1];
4713         struct in6_addr *addr = NULL, *peer;
4714         struct net_device *dev = NULL;
4715         struct inet6_ifaddr *ifa;
4716         struct sk_buff *skb;
4717         int err;
4718
4719         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4720         if (err < 0)
4721                 goto errout;
4722
4723         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4724         if (!addr) {
4725                 err = -EINVAL;
4726                 goto errout;
4727         }
4728
4729         ifm = nlmsg_data(nlh);
4730         if (ifm->ifa_index)
4731                 dev = __dev_get_by_index(net, ifm->ifa_index);
4732
4733         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4734         if (!ifa) {
4735                 err = -EADDRNOTAVAIL;
4736                 goto errout;
4737         }
4738
4739         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4740         if (!skb) {
4741                 err = -ENOBUFS;
4742                 goto errout_ifa;
4743         }
4744
4745         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4746                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4747         if (err < 0) {
4748                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4749                 WARN_ON(err == -EMSGSIZE);
4750                 kfree_skb(skb);
4751                 goto errout_ifa;
4752         }
4753         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4754 errout_ifa:
4755         in6_ifa_put(ifa);
4756 errout:
4757         return err;
4758 }
4759
4760 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4761 {
4762         struct sk_buff *skb;
4763         struct net *net = dev_net(ifa->idev->dev);
4764         int err = -ENOBUFS;
4765
4766         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4767         if (!skb)
4768                 goto errout;
4769
4770         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4771         if (err < 0) {
4772                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4773                 WARN_ON(err == -EMSGSIZE);
4774                 kfree_skb(skb);
4775                 goto errout;
4776         }
4777         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4778         return;
4779 errout:
4780         if (err < 0)
4781                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4782 }
4783
4784 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4785                                 __s32 *array, int bytes)
4786 {
4787         BUG_ON(bytes < (DEVCONF_MAX * 4));
4788
4789         memset(array, 0, bytes);
4790         array[DEVCONF_FORWARDING] = cnf->forwarding;
4791         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4792         array[DEVCONF_MTU6] = cnf->mtu6;
4793         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4794         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4795         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4796         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4797         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4798         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4799                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4800         array[DEVCONF_RTR_SOLICIT_DELAY] =
4801                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4802         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4803         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4804                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4805         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4806                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4807         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4808         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4809         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4810         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4811         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4812         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4813         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4814         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4815         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4816 #ifdef CONFIG_IPV6_ROUTER_PREF
4817         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4818         array[DEVCONF_RTR_PROBE_INTERVAL] =
4819                 jiffies_to_msecs(cnf->rtr_probe_interval);
4820 #ifdef CONFIG_IPV6_ROUTE_INFO
4821         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4822 #endif
4823 #endif
4824         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4825         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4826 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4827         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4828         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4829 #endif
4830 #ifdef CONFIG_IPV6_MROUTE
4831         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4832 #endif
4833         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4834         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4835         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4836         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4837         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4838         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4839         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4840         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4841         /* we omit DEVCONF_STABLE_SECRET for now */
4842         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4843         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4844         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4845         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4846 }
4847
4848 static inline size_t inet6_ifla6_size(void)
4849 {
4850         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4851              + nla_total_size(sizeof(struct ifla_cacheinfo))
4852              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4853              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4854              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4855              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4856 }
4857
4858 static inline size_t inet6_if_nlmsg_size(void)
4859 {
4860         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4861                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4862                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4863                + nla_total_size(4) /* IFLA_MTU */
4864                + nla_total_size(4) /* IFLA_LINK */
4865                + nla_total_size(1) /* IFLA_OPERSTATE */
4866                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4867 }
4868
4869 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4870                                       int items, int bytes)
4871 {
4872         int i;
4873         int pad = bytes - sizeof(u64) * items;
4874         BUG_ON(pad < 0);
4875
4876         /* Use put_unaligned() because stats may not be aligned for u64. */
4877         put_unaligned(items, &stats[0]);
4878         for (i = 1; i < items; i++)
4879                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4880
4881         memset(&stats[items], 0, pad);
4882 }
4883
4884 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4885                                         int bytes, size_t syncpoff)
4886 {
4887         int i, c;
4888         u64 buff[IPSTATS_MIB_MAX];
4889         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4890
4891         BUG_ON(pad < 0);
4892
4893         memset(buff, 0, sizeof(buff));
4894         buff[0] = IPSTATS_MIB_MAX;
4895
4896         for_each_possible_cpu(c) {
4897                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4898                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4899         }
4900
4901         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4902         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4903 }
4904
4905 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4906                              int bytes)
4907 {
4908         switch (attrtype) {
4909         case IFLA_INET6_STATS:
4910                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4911                                      offsetof(struct ipstats_mib, syncp));
4912                 break;
4913         case IFLA_INET6_ICMP6STATS:
4914                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4915                 break;
4916         }
4917 }
4918
4919 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4920                                   u32 ext_filter_mask)
4921 {
4922         struct nlattr *nla;
4923         struct ifla_cacheinfo ci;
4924
4925         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4926                 goto nla_put_failure;
4927         ci.max_reasm_len = IPV6_MAXPLEN;
4928         ci.tstamp = cstamp_delta(idev->tstamp);
4929         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4930         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4931         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4932                 goto nla_put_failure;
4933         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4934         if (!nla)
4935                 goto nla_put_failure;
4936         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4937
4938         /* XXX - MC not implemented */
4939
4940         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4941                 return 0;
4942
4943         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4944         if (!nla)
4945                 goto nla_put_failure;
4946         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4947
4948         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4949         if (!nla)
4950                 goto nla_put_failure;
4951         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4952
4953         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4954         if (!nla)
4955                 goto nla_put_failure;
4956
4957         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4958                 goto nla_put_failure;
4959
4960         read_lock_bh(&idev->lock);
4961         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4962         read_unlock_bh(&idev->lock);
4963
4964         return 0;
4965
4966 nla_put_failure:
4967         return -EMSGSIZE;
4968 }
4969
4970 static size_t inet6_get_link_af_size(const struct net_device *dev,
4971                                      u32 ext_filter_mask)
4972 {
4973         if (!__in6_dev_get(dev))
4974                 return 0;
4975
4976         return inet6_ifla6_size();
4977 }
4978
4979 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4980                               u32 ext_filter_mask)
4981 {
4982         struct inet6_dev *idev = __in6_dev_get(dev);
4983
4984         if (!idev)
4985                 return -ENODATA;
4986
4987         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4988                 return -EMSGSIZE;
4989
4990         return 0;
4991 }
4992
4993 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4994 {
4995         struct inet6_ifaddr *ifp;
4996         struct net_device *dev = idev->dev;
4997         bool clear_token, update_rs = false;
4998         struct in6_addr ll_addr;
4999
5000         ASSERT_RTNL();
5001
5002         if (!token)
5003                 return -EINVAL;
5004         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5005                 return -EINVAL;
5006         if (!ipv6_accept_ra(idev))
5007                 return -EINVAL;
5008         if (idev->cnf.rtr_solicits <= 0)
5009                 return -EINVAL;
5010
5011         write_lock_bh(&idev->lock);
5012
5013         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5014         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5015
5016         write_unlock_bh(&idev->lock);
5017
5018         clear_token = ipv6_addr_any(token);
5019         if (clear_token)
5020                 goto update_lft;
5021
5022         if (!idev->dead && (idev->if_flags & IF_READY) &&
5023             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5024                              IFA_F_OPTIMISTIC)) {
5025                 /* If we're not ready, then normal ifup will take care
5026                  * of this. Otherwise, we need to request our rs here.
5027                  */
5028                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5029                 update_rs = true;
5030         }
5031
5032 update_lft:
5033         write_lock_bh(&idev->lock);
5034
5035         if (update_rs) {
5036                 idev->if_flags |= IF_RS_SENT;
5037                 idev->rs_probes = 1;
5038                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5039         }
5040
5041         /* Well, that's kinda nasty ... */
5042         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5043                 spin_lock(&ifp->lock);
5044                 if (ifp->tokenized) {
5045                         ifp->valid_lft = 0;
5046                         ifp->prefered_lft = 0;
5047                 }
5048                 spin_unlock(&ifp->lock);
5049         }
5050
5051         write_unlock_bh(&idev->lock);
5052         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5053         addrconf_verify_rtnl();
5054         return 0;
5055 }
5056
5057 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5058         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5059         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5060 };
5061
5062 static int inet6_validate_link_af(const struct net_device *dev,
5063                                   const struct nlattr *nla)
5064 {
5065         struct nlattr *tb[IFLA_INET6_MAX + 1];
5066
5067         if (dev && !__in6_dev_get(dev))
5068                 return -EAFNOSUPPORT;
5069
5070         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5071 }
5072
5073 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5074 {
5075         int err = -EINVAL;
5076         struct inet6_dev *idev = __in6_dev_get(dev);
5077         struct nlattr *tb[IFLA_INET6_MAX + 1];
5078
5079         if (!idev)
5080                 return -EAFNOSUPPORT;
5081
5082         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5083                 BUG();
5084
5085         if (tb[IFLA_INET6_TOKEN]) {
5086                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5087                 if (err)
5088                         return err;
5089         }
5090
5091         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5092                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5093
5094                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5095                     mode != IN6_ADDR_GEN_MODE_NONE &&
5096                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5097                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5098                         return -EINVAL;
5099
5100                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5101                     !idev->cnf.stable_secret.initialized &&
5102                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5103                         return -EINVAL;
5104
5105                 idev->addr_gen_mode = mode;
5106                 err = 0;
5107         }
5108
5109         return err;
5110 }
5111
5112 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5113                              u32 portid, u32 seq, int event, unsigned int flags)
5114 {
5115         struct net_device *dev = idev->dev;
5116         struct ifinfomsg *hdr;
5117         struct nlmsghdr *nlh;
5118         void *protoinfo;
5119
5120         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5121         if (!nlh)
5122                 return -EMSGSIZE;
5123
5124         hdr = nlmsg_data(nlh);
5125         hdr->ifi_family = AF_INET6;
5126         hdr->__ifi_pad = 0;
5127         hdr->ifi_type = dev->type;
5128         hdr->ifi_index = dev->ifindex;
5129         hdr->ifi_flags = dev_get_flags(dev);
5130         hdr->ifi_change = 0;
5131
5132         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5133             (dev->addr_len &&
5134              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5135             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5136             (dev->ifindex != dev_get_iflink(dev) &&
5137              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5138             nla_put_u8(skb, IFLA_OPERSTATE,
5139                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5140                 goto nla_put_failure;
5141         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5142         if (!protoinfo)
5143                 goto nla_put_failure;
5144
5145         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5146                 goto nla_put_failure;
5147
5148         nla_nest_end(skb, protoinfo);
5149         nlmsg_end(skb, nlh);
5150         return 0;
5151
5152 nla_put_failure:
5153         nlmsg_cancel(skb, nlh);
5154         return -EMSGSIZE;
5155 }
5156
5157 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5158 {
5159         struct net *net = sock_net(skb->sk);
5160         int h, s_h;
5161         int idx = 0, s_idx;
5162         struct net_device *dev;
5163         struct inet6_dev *idev;
5164         struct hlist_head *head;
5165
5166         s_h = cb->args[0];
5167         s_idx = cb->args[1];
5168
5169         rcu_read_lock();
5170         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5171                 idx = 0;
5172                 head = &net->dev_index_head[h];
5173                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5174                         if (idx < s_idx)
5175                                 goto cont;
5176                         idev = __in6_dev_get(dev);
5177                         if (!idev)
5178                                 goto cont;
5179                         if (inet6_fill_ifinfo(skb, idev,
5180                                               NETLINK_CB(cb->skb).portid,
5181                                               cb->nlh->nlmsg_seq,
5182                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5183                                 goto out;
5184 cont:
5185                         idx++;
5186                 }
5187         }
5188 out:
5189         rcu_read_unlock();
5190         cb->args[1] = idx;
5191         cb->args[0] = h;
5192
5193         return skb->len;
5194 }
5195
5196 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5197 {
5198         struct sk_buff *skb;
5199         struct net *net = dev_net(idev->dev);
5200         int err = -ENOBUFS;
5201
5202         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5203         if (!skb)
5204                 goto errout;
5205
5206         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5207         if (err < 0) {
5208                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5209                 WARN_ON(err == -EMSGSIZE);
5210                 kfree_skb(skb);
5211                 goto errout;
5212         }
5213         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5214         return;
5215 errout:
5216         if (err < 0)
5217                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5218 }
5219
5220 static inline size_t inet6_prefix_nlmsg_size(void)
5221 {
5222         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5223                + nla_total_size(sizeof(struct in6_addr))
5224                + nla_total_size(sizeof(struct prefix_cacheinfo));
5225 }
5226
5227 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5228                              struct prefix_info *pinfo, u32 portid, u32 seq,
5229                              int event, unsigned int flags)
5230 {
5231         struct prefixmsg *pmsg;
5232         struct nlmsghdr *nlh;
5233         struct prefix_cacheinfo ci;
5234
5235         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5236         if (!nlh)
5237                 return -EMSGSIZE;
5238
5239         pmsg = nlmsg_data(nlh);
5240         pmsg->prefix_family = AF_INET6;
5241         pmsg->prefix_pad1 = 0;
5242         pmsg->prefix_pad2 = 0;
5243         pmsg->prefix_ifindex = idev->dev->ifindex;
5244         pmsg->prefix_len = pinfo->prefix_len;
5245         pmsg->prefix_type = pinfo->type;
5246         pmsg->prefix_pad3 = 0;
5247         pmsg->prefix_flags = 0;
5248         if (pinfo->onlink)
5249                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5250         if (pinfo->autoconf)
5251                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5252
5253         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5254                 goto nla_put_failure;
5255         ci.preferred_time = ntohl(pinfo->prefered);
5256         ci.valid_time = ntohl(pinfo->valid);
5257         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5258                 goto nla_put_failure;
5259         nlmsg_end(skb, nlh);
5260         return 0;
5261
5262 nla_put_failure:
5263         nlmsg_cancel(skb, nlh);
5264         return -EMSGSIZE;
5265 }
5266
5267 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5268                          struct prefix_info *pinfo)
5269 {
5270         struct sk_buff *skb;
5271         struct net *net = dev_net(idev->dev);
5272         int err = -ENOBUFS;
5273
5274         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5275         if (!skb)
5276                 goto errout;
5277
5278         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5279         if (err < 0) {
5280                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5281                 WARN_ON(err == -EMSGSIZE);
5282                 kfree_skb(skb);
5283                 goto errout;
5284         }
5285         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5286         return;
5287 errout:
5288         if (err < 0)
5289                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5290 }
5291
5292 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5293 {
5294         struct net *net = dev_net(ifp->idev->dev);
5295
5296         if (event)
5297                 ASSERT_RTNL();
5298
5299         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5300
5301         switch (event) {
5302         case RTM_NEWADDR:
5303                 /*
5304                  * If the address was optimistic
5305                  * we inserted the route at the start of
5306                  * our DAD process, so we don't need
5307                  * to do it again
5308                  */
5309                 if (!(ifp->rt->rt6i_node))
5310                         ip6_ins_rt(ifp->rt);
5311                 if (ifp->idev->cnf.forwarding)
5312                         addrconf_join_anycast(ifp);
5313                 if (!ipv6_addr_any(&ifp->peer_addr))
5314                         addrconf_prefix_route(&ifp->peer_addr, 128,
5315                                               ifp->idev->dev, 0, 0);
5316                 break;
5317         case RTM_DELADDR:
5318                 if (ifp->idev->cnf.forwarding)
5319                         addrconf_leave_anycast(ifp);
5320                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5321                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5322                         struct rt6_info *rt;
5323
5324                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5325                                                        ifp->idev->dev, 0, 0);
5326                         if (rt)
5327                                 ip6_del_rt(rt);
5328                 }
5329                 dst_hold(&ifp->rt->dst);
5330
5331                 ip6_del_rt(ifp->rt);
5332
5333                 rt_genid_bump_ipv6(net);
5334                 break;
5335         }
5336         atomic_inc(&net->ipv6.dev_addr_genid);
5337 }
5338
5339 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5340 {
5341         rcu_read_lock_bh();
5342         if (likely(ifp->idev->dead == 0))
5343                 __ipv6_ifa_notify(event, ifp);
5344         rcu_read_unlock_bh();
5345 }
5346
5347 #ifdef CONFIG_SYSCTL
5348
5349 static
5350 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5351                            void __user *buffer, size_t *lenp, loff_t *ppos)
5352 {
5353         int *valp = ctl->data;
5354         int val = *valp;
5355         loff_t pos = *ppos;
5356         struct ctl_table lctl;
5357         int ret;
5358
5359         /*
5360          * ctl->data points to idev->cnf.forwarding, we should
5361          * not modify it until we get the rtnl lock.
5362          */
5363         lctl = *ctl;
5364         lctl.data = &val;
5365
5366         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5367
5368         if (write)
5369                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5370         if (ret)
5371                 *ppos = pos;
5372         return ret;
5373 }
5374
5375 static
5376 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5377                               void __user *buffer, size_t *lenp, loff_t *ppos)
5378 {
5379         struct ctl_table lctl;
5380         int min_hl = 1, max_hl = 255;
5381
5382         lctl = *ctl;
5383         lctl.extra1 = &min_hl;
5384         lctl.extra2 = &max_hl;
5385
5386         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5387 }
5388
5389 static
5390 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5391                         void __user *buffer, size_t *lenp, loff_t *ppos)
5392 {
5393         struct inet6_dev *idev = ctl->extra1;
5394         int min_mtu = IPV6_MIN_MTU;
5395         struct ctl_table lctl;
5396
5397         lctl = *ctl;
5398         lctl.extra1 = &min_mtu;
5399         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5400
5401         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5402 }
5403
5404 static void dev_disable_change(struct inet6_dev *idev)
5405 {
5406         struct netdev_notifier_info info;
5407
5408         if (!idev || !idev->dev)
5409                 return;
5410
5411         netdev_notifier_info_init(&info, idev->dev);
5412         if (idev->cnf.disable_ipv6)
5413                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5414         else
5415                 addrconf_notify(NULL, NETDEV_UP, &info);
5416 }
5417
5418 static void addrconf_disable_change(struct net *net, __s32 newf)
5419 {
5420         struct net_device *dev;
5421         struct inet6_dev *idev;
5422
5423         rcu_read_lock();
5424         for_each_netdev_rcu(net, dev) {
5425                 idev = __in6_dev_get(dev);
5426                 if (idev) {
5427                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5428                         idev->cnf.disable_ipv6 = newf;
5429                         if (changed)
5430                                 dev_disable_change(idev);
5431                 }
5432         }
5433         rcu_read_unlock();
5434 }
5435
5436 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5437 {
5438         struct net *net;
5439         int old;
5440
5441         if (!rtnl_trylock())
5442                 return restart_syscall();
5443
5444         net = (struct net *)table->extra2;
5445         old = *p;
5446         *p = newf;
5447
5448         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5449                 rtnl_unlock();
5450                 return 0;
5451         }
5452
5453         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5454                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5455                 addrconf_disable_change(net, newf);
5456         } else if ((!newf) ^ (!old))
5457                 dev_disable_change((struct inet6_dev *)table->extra1);
5458
5459         rtnl_unlock();
5460         return 0;
5461 }
5462
5463 static
5464 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5465                             void __user *buffer, size_t *lenp, loff_t *ppos)
5466 {
5467         int *valp = ctl->data;
5468         int val = *valp;
5469         loff_t pos = *ppos;
5470         struct ctl_table lctl;
5471         int ret;
5472
5473         /*
5474          * ctl->data points to idev->cnf.disable_ipv6, we should
5475          * not modify it until we get the rtnl lock.
5476          */
5477         lctl = *ctl;
5478         lctl.data = &val;
5479
5480         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5481
5482         if (write)
5483                 ret = addrconf_disable_ipv6(ctl, valp, val);
5484         if (ret)
5485                 *ppos = pos;
5486         return ret;
5487 }
5488
5489 static
5490 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5491                               void __user *buffer, size_t *lenp, loff_t *ppos)
5492 {
5493         int *valp = ctl->data;
5494         int ret;
5495         int old, new;
5496
5497         old = *valp;
5498         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5499         new = *valp;
5500
5501         if (write && old != new) {
5502                 struct net *net = ctl->extra2;
5503
5504                 if (!rtnl_trylock())
5505                         return restart_syscall();
5506
5507                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5508                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5509                                                      NETCONFA_IFINDEX_DEFAULT,
5510                                                      net->ipv6.devconf_dflt);
5511                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5512                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5513                                                      NETCONFA_IFINDEX_ALL,
5514                                                      net->ipv6.devconf_all);
5515                 else {
5516                         struct inet6_dev *idev = ctl->extra1;
5517
5518                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5519                                                      idev->dev->ifindex,
5520                                                      &idev->cnf);
5521                 }
5522                 rtnl_unlock();
5523         }
5524
5525         return ret;
5526 }
5527
5528 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5529                                          void __user *buffer, size_t *lenp,
5530                                          loff_t *ppos)
5531 {
5532         int err;
5533         struct in6_addr addr;
5534         char str[IPV6_MAX_STRLEN];
5535         struct ctl_table lctl = *ctl;
5536         struct net *net = ctl->extra2;
5537         struct ipv6_stable_secret *secret = ctl->data;
5538
5539         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5540                 return -EIO;
5541
5542         lctl.maxlen = IPV6_MAX_STRLEN;
5543         lctl.data = str;
5544
5545         if (!rtnl_trylock())
5546                 return restart_syscall();
5547
5548         if (!write && !secret->initialized) {
5549                 err = -EIO;
5550                 goto out;
5551         }
5552
5553         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5554         if (err >= sizeof(str)) {
5555                 err = -EIO;
5556                 goto out;
5557         }
5558
5559         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5560         if (err || !write)
5561                 goto out;
5562
5563         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5564                 err = -EIO;
5565                 goto out;
5566         }
5567
5568         secret->initialized = true;
5569         secret->secret = addr;
5570
5571         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5572                 struct net_device *dev;
5573
5574                 for_each_netdev(net, dev) {
5575                         struct inet6_dev *idev = __in6_dev_get(dev);
5576
5577                         if (idev) {
5578                                 idev->addr_gen_mode =
5579                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5580                         }
5581                 }
5582         } else {
5583                 struct inet6_dev *idev = ctl->extra1;
5584
5585                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5586         }
5587
5588 out:
5589         rtnl_unlock();
5590
5591         return err;
5592 }
5593
5594 static
5595 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5596                                                 int write,
5597                                                 void __user *buffer,
5598                                                 size_t *lenp,
5599                                                 loff_t *ppos)
5600 {
5601         int *valp = ctl->data;
5602         int val = *valp;
5603         loff_t pos = *ppos;
5604         struct ctl_table lctl;
5605         int ret;
5606
5607         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5608          * we should not modify it until we get the rtnl lock.
5609          */
5610         lctl = *ctl;
5611         lctl.data = &val;
5612
5613         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5614
5615         if (write)
5616                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5617         if (ret)
5618                 *ppos = pos;
5619         return ret;
5620 }
5621
5622 static const struct ctl_table addrconf_sysctl[] = {
5623                 {
5624                         .procname       = "forwarding",
5625                         .data           = &ipv6_devconf.forwarding,
5626                         .maxlen         = sizeof(int),
5627                         .mode           = 0644,
5628                         .proc_handler   = addrconf_sysctl_forward,
5629                 },
5630                 {
5631                         .procname       = "hop_limit",
5632                         .data           = &ipv6_devconf.hop_limit,
5633                         .maxlen         = sizeof(int),
5634                         .mode           = 0644,
5635                         .proc_handler   = addrconf_sysctl_hop_limit,
5636                 },
5637                 {
5638                         .procname       = "mtu",
5639                         .data           = &ipv6_devconf.mtu6,
5640                         .maxlen         = sizeof(int),
5641                         .mode           = 0644,
5642                         .proc_handler   = addrconf_sysctl_mtu,
5643                 },
5644                 {
5645                         .procname       = "accept_ra",
5646                         .data           = &ipv6_devconf.accept_ra,
5647                         .maxlen         = sizeof(int),
5648                         .mode           = 0644,
5649                         .proc_handler   = proc_dointvec,
5650                 },
5651                 {
5652                         .procname       = "accept_redirects",
5653                         .data           = &ipv6_devconf.accept_redirects,
5654                         .maxlen         = sizeof(int),
5655                         .mode           = 0644,
5656                         .proc_handler   = proc_dointvec,
5657                 },
5658                 {
5659                         .procname       = "autoconf",
5660                         .data           = &ipv6_devconf.autoconf,
5661                         .maxlen         = sizeof(int),
5662                         .mode           = 0644,
5663                         .proc_handler   = proc_dointvec,
5664                 },
5665                 {
5666                         .procname       = "dad_transmits",
5667                         .data           = &ipv6_devconf.dad_transmits,
5668                         .maxlen         = sizeof(int),
5669                         .mode           = 0644,
5670                         .proc_handler   = proc_dointvec,
5671                 },
5672                 {
5673                         .procname       = "router_solicitations",
5674                         .data           = &ipv6_devconf.rtr_solicits,
5675                         .maxlen         = sizeof(int),
5676                         .mode           = 0644,
5677                         .proc_handler   = proc_dointvec,
5678                 },
5679                 {
5680                         .procname       = "router_solicitation_interval",
5681                         .data           = &ipv6_devconf.rtr_solicit_interval,
5682                         .maxlen         = sizeof(int),
5683                         .mode           = 0644,
5684                         .proc_handler   = proc_dointvec_jiffies,
5685                 },
5686                 {
5687                         .procname       = "router_solicitation_delay",
5688                         .data           = &ipv6_devconf.rtr_solicit_delay,
5689                         .maxlen         = sizeof(int),
5690                         .mode           = 0644,
5691                         .proc_handler   = proc_dointvec_jiffies,
5692                 },
5693                 {
5694                         .procname       = "force_mld_version",
5695                         .data           = &ipv6_devconf.force_mld_version,
5696                         .maxlen         = sizeof(int),
5697                         .mode           = 0644,
5698                         .proc_handler   = proc_dointvec,
5699                 },
5700                 {
5701                         .procname       = "mldv1_unsolicited_report_interval",
5702                         .data           =
5703                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
5704                         .maxlen         = sizeof(int),
5705                         .mode           = 0644,
5706                         .proc_handler   = proc_dointvec_ms_jiffies,
5707                 },
5708                 {
5709                         .procname       = "mldv2_unsolicited_report_interval",
5710                         .data           =
5711                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
5712                         .maxlen         = sizeof(int),
5713                         .mode           = 0644,
5714                         .proc_handler   = proc_dointvec_ms_jiffies,
5715                 },
5716                 {
5717                         .procname       = "use_tempaddr",
5718                         .data           = &ipv6_devconf.use_tempaddr,
5719                         .maxlen         = sizeof(int),
5720                         .mode           = 0644,
5721                         .proc_handler   = proc_dointvec,
5722                 },
5723                 {
5724                         .procname       = "temp_valid_lft",
5725                         .data           = &ipv6_devconf.temp_valid_lft,
5726                         .maxlen         = sizeof(int),
5727                         .mode           = 0644,
5728                         .proc_handler   = proc_dointvec,
5729                 },
5730                 {
5731                         .procname       = "temp_prefered_lft",
5732                         .data           = &ipv6_devconf.temp_prefered_lft,
5733                         .maxlen         = sizeof(int),
5734                         .mode           = 0644,
5735                         .proc_handler   = proc_dointvec,
5736                 },
5737                 {
5738                         .procname       = "regen_max_retry",
5739                         .data           = &ipv6_devconf.regen_max_retry,
5740                         .maxlen         = sizeof(int),
5741                         .mode           = 0644,
5742                         .proc_handler   = proc_dointvec,
5743                 },
5744                 {
5745                         .procname       = "max_desync_factor",
5746                         .data           = &ipv6_devconf.max_desync_factor,
5747                         .maxlen         = sizeof(int),
5748                         .mode           = 0644,
5749                         .proc_handler   = proc_dointvec,
5750                 },
5751                 {
5752                         .procname       = "max_addresses",
5753                         .data           = &ipv6_devconf.max_addresses,
5754                         .maxlen         = sizeof(int),
5755                         .mode           = 0644,
5756                         .proc_handler   = proc_dointvec,
5757                 },
5758                 {
5759                         .procname       = "accept_ra_defrtr",
5760                         .data           = &ipv6_devconf.accept_ra_defrtr,
5761                         .maxlen         = sizeof(int),
5762                         .mode           = 0644,
5763                         .proc_handler   = proc_dointvec,
5764                 },
5765                 {
5766                         .procname       = "accept_ra_min_hop_limit",
5767                         .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5768                         .maxlen         = sizeof(int),
5769                         .mode           = 0644,
5770                         .proc_handler   = proc_dointvec,
5771                 },
5772                 {
5773                         .procname       = "accept_ra_pinfo",
5774                         .data           = &ipv6_devconf.accept_ra_pinfo,
5775                         .maxlen         = sizeof(int),
5776                         .mode           = 0644,
5777                         .proc_handler   = proc_dointvec,
5778                 },
5779 #ifdef CONFIG_IPV6_ROUTER_PREF
5780                 {
5781                         .procname       = "accept_ra_rtr_pref",
5782                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
5783                         .maxlen         = sizeof(int),
5784                         .mode           = 0644,
5785                         .proc_handler   = proc_dointvec,
5786                 },
5787                 {
5788                         .procname       = "router_probe_interval",
5789                         .data           = &ipv6_devconf.rtr_probe_interval,
5790                         .maxlen         = sizeof(int),
5791                         .mode           = 0644,
5792                         .proc_handler   = proc_dointvec_jiffies,
5793                 },
5794 #ifdef CONFIG_IPV6_ROUTE_INFO
5795                 {
5796                         .procname       = "accept_ra_rt_info_max_plen",
5797                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5798                         .maxlen         = sizeof(int),
5799                         .mode           = 0644,
5800                         .proc_handler   = proc_dointvec,
5801                 },
5802 #endif
5803 #endif
5804                 {
5805                         .procname       = "proxy_ndp",
5806                         .data           = &ipv6_devconf.proxy_ndp,
5807                         .maxlen         = sizeof(int),
5808                         .mode           = 0644,
5809                         .proc_handler   = addrconf_sysctl_proxy_ndp,
5810                 },
5811                 {
5812                         .procname       = "accept_source_route",
5813                         .data           = &ipv6_devconf.accept_source_route,
5814                         .maxlen         = sizeof(int),
5815                         .mode           = 0644,
5816                         .proc_handler   = proc_dointvec,
5817                 },
5818 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5819                 {
5820                         .procname       = "optimistic_dad",
5821                         .data           = &ipv6_devconf.optimistic_dad,
5822                         .maxlen         = sizeof(int),
5823                         .mode           = 0644,
5824                         .proc_handler   = proc_dointvec,
5825
5826                 },
5827                 {
5828                         .procname       = "use_optimistic",
5829                         .data           = &ipv6_devconf.use_optimistic,
5830                         .maxlen         = sizeof(int),
5831                         .mode           = 0644,
5832                         .proc_handler   = proc_dointvec,
5833
5834                 },
5835 #endif
5836 #ifdef CONFIG_IPV6_MROUTE
5837                 {
5838                         .procname       = "mc_forwarding",
5839                         .data           = &ipv6_devconf.mc_forwarding,
5840                         .maxlen         = sizeof(int),
5841                         .mode           = 0444,
5842                         .proc_handler   = proc_dointvec,
5843                 },
5844 #endif
5845                 {
5846                         .procname       = "disable_ipv6",
5847                         .data           = &ipv6_devconf.disable_ipv6,
5848                         .maxlen         = sizeof(int),
5849                         .mode           = 0644,
5850                         .proc_handler   = addrconf_sysctl_disable,
5851                 },
5852                 {
5853                         .procname       = "accept_dad",
5854                         .data           = &ipv6_devconf.accept_dad,
5855                         .maxlen         = sizeof(int),
5856                         .mode           = 0644,
5857                         .proc_handler   = proc_dointvec,
5858                 },
5859                 {
5860                         .procname       = "force_tllao",
5861                         .data           = &ipv6_devconf.force_tllao,
5862                         .maxlen         = sizeof(int),
5863                         .mode           = 0644,
5864                         .proc_handler   = proc_dointvec
5865                 },
5866                 {
5867                         .procname       = "ndisc_notify",
5868                         .data           = &ipv6_devconf.ndisc_notify,
5869                         .maxlen         = sizeof(int),
5870                         .mode           = 0644,
5871                         .proc_handler   = proc_dointvec
5872                 },
5873                 {
5874                         .procname       = "suppress_frag_ndisc",
5875                         .data           = &ipv6_devconf.suppress_frag_ndisc,
5876                         .maxlen         = sizeof(int),
5877                         .mode           = 0644,
5878                         .proc_handler   = proc_dointvec
5879                 },
5880                 {
5881                         .procname       = "accept_ra_from_local",
5882                         .data           = &ipv6_devconf.accept_ra_from_local,
5883                         .maxlen         = sizeof(int),
5884                         .mode           = 0644,
5885                         .proc_handler   = proc_dointvec,
5886                 },
5887                 {
5888                         .procname       = "accept_ra_mtu",
5889                         .data           = &ipv6_devconf.accept_ra_mtu,
5890                         .maxlen         = sizeof(int),
5891                         .mode           = 0644,
5892                         .proc_handler   = proc_dointvec,
5893                 },
5894                 {
5895                         .procname       = "stable_secret",
5896                         .data           = &ipv6_devconf.stable_secret,
5897                         .maxlen         = IPV6_MAX_STRLEN,
5898                         .mode           = 0600,
5899                         .proc_handler   = addrconf_sysctl_stable_secret,
5900                 },
5901                 {
5902                         .procname       = "use_oif_addrs_only",
5903                         .data           = &ipv6_devconf.use_oif_addrs_only,
5904                         .maxlen         = sizeof(int),
5905                         .mode           = 0644,
5906                         .proc_handler   = proc_dointvec,
5907                 },
5908                 {
5909                         .procname       = "ignore_routes_with_linkdown",
5910                         .data           = &ipv6_devconf.ignore_routes_with_linkdown,
5911                         .maxlen         = sizeof(int),
5912                         .mode           = 0644,
5913                         .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
5914                 },
5915                 {
5916                         .procname       = "drop_unicast_in_l2_multicast",
5917                         .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
5918                         .maxlen         = sizeof(int),
5919                         .mode           = 0644,
5920                         .proc_handler   = proc_dointvec,
5921                 },
5922                 {
5923                         .procname       = "drop_unsolicited_na",
5924                         .data           = &ipv6_devconf.drop_unsolicited_na,
5925                         .maxlen         = sizeof(int),
5926                         .mode           = 0644,
5927                         .proc_handler   = proc_dointvec,
5928                 },
5929                 {
5930                         .procname       = "keep_addr_on_down",
5931                         .data           = &ipv6_devconf.keep_addr_on_down,
5932                         .maxlen         = sizeof(int),
5933                         .mode           = 0644,
5934                         .proc_handler   = proc_dointvec,
5935
5936                 },
5937                 {
5938                         /* sentinel */
5939                 }
5940 };
5941
5942 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5943                 struct inet6_dev *idev, struct ipv6_devconf *p)
5944 {
5945         int i;
5946         struct ctl_table *table;
5947         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5948
5949         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
5950         if (!table)
5951                 goto out;
5952
5953         for (i = 0; table[i].data; i++) {
5954                 table[i].data += (char *)p - (char *)&ipv6_devconf;
5955                 table[i].extra1 = idev; /* embedded; no ref */
5956                 table[i].extra2 = net;
5957         }
5958
5959         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5960
5961         p->sysctl_header = register_net_sysctl(net, path, table);
5962         if (!p->sysctl_header)
5963                 goto free;
5964
5965         return 0;
5966
5967 free:
5968         kfree(table);
5969 out:
5970         return -ENOBUFS;
5971 }
5972
5973 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5974 {
5975         struct ctl_table *table;
5976
5977         if (!p->sysctl_header)
5978                 return;
5979
5980         table = p->sysctl_header->ctl_table_arg;
5981         unregister_net_sysctl_table(p->sysctl_header);
5982         p->sysctl_header = NULL;
5983         kfree(table);
5984 }
5985
5986 static int addrconf_sysctl_register(struct inet6_dev *idev)
5987 {
5988         int err;
5989
5990         if (!sysctl_dev_name_is_allowed(idev->dev->name))
5991                 return -EINVAL;
5992
5993         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5994                                     &ndisc_ifinfo_sysctl_change);
5995         if (err)
5996                 return err;
5997         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5998                                          idev, &idev->cnf);
5999         if (err)
6000                 neigh_sysctl_unregister(idev->nd_parms);
6001
6002         return err;
6003 }
6004
6005 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6006 {
6007         __addrconf_sysctl_unregister(&idev->cnf);
6008         neigh_sysctl_unregister(idev->nd_parms);
6009 }
6010
6011
6012 #endif
6013
6014 static int __net_init addrconf_init_net(struct net *net)
6015 {
6016         int err = -ENOMEM;
6017         struct ipv6_devconf *all, *dflt;
6018
6019         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6020         if (!all)
6021                 goto err_alloc_all;
6022
6023         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6024         if (!dflt)
6025                 goto err_alloc_dflt;
6026
6027         /* these will be inherited by all namespaces */
6028         dflt->autoconf = ipv6_defaults.autoconf;
6029         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6030
6031         dflt->stable_secret.initialized = false;
6032         all->stable_secret.initialized = false;
6033
6034         net->ipv6.devconf_all = all;
6035         net->ipv6.devconf_dflt = dflt;
6036
6037 #ifdef CONFIG_SYSCTL
6038         err = __addrconf_sysctl_register(net, "all", NULL, all);
6039         if (err < 0)
6040                 goto err_reg_all;
6041
6042         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6043         if (err < 0)
6044                 goto err_reg_dflt;
6045 #endif
6046         return 0;
6047
6048 #ifdef CONFIG_SYSCTL
6049 err_reg_dflt:
6050         __addrconf_sysctl_unregister(all);
6051 err_reg_all:
6052         kfree(dflt);
6053 #endif
6054 err_alloc_dflt:
6055         kfree(all);
6056 err_alloc_all:
6057         return err;
6058 }
6059
6060 static void __net_exit addrconf_exit_net(struct net *net)
6061 {
6062 #ifdef CONFIG_SYSCTL
6063         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6064         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6065 #endif
6066         kfree(net->ipv6.devconf_dflt);
6067         kfree(net->ipv6.devconf_all);
6068 }
6069
6070 static struct pernet_operations addrconf_ops = {
6071         .init = addrconf_init_net,
6072         .exit = addrconf_exit_net,
6073 };
6074
6075 static struct rtnl_af_ops inet6_ops __read_mostly = {
6076         .family           = AF_INET6,
6077         .fill_link_af     = inet6_fill_link_af,
6078         .get_link_af_size = inet6_get_link_af_size,
6079         .validate_link_af = inet6_validate_link_af,
6080         .set_link_af      = inet6_set_link_af,
6081 };
6082
6083 /*
6084  *      Init / cleanup code
6085  */
6086
6087 int __init addrconf_init(void)
6088 {
6089         struct inet6_dev *idev;
6090         int i, err;
6091
6092         err = ipv6_addr_label_init();
6093         if (err < 0) {
6094                 pr_crit("%s: cannot initialize default policy table: %d\n",
6095                         __func__, err);
6096                 goto out;
6097         }
6098
6099         err = register_pernet_subsys(&addrconf_ops);
6100         if (err < 0)
6101                 goto out_addrlabel;
6102
6103         addrconf_wq = create_workqueue("ipv6_addrconf");
6104         if (!addrconf_wq) {
6105                 err = -ENOMEM;
6106                 goto out_nowq;
6107         }
6108
6109         /* The addrconf netdev notifier requires that loopback_dev
6110          * has it's ipv6 private information allocated and setup
6111          * before it can bring up and give link-local addresses
6112          * to other devices which are up.
6113          *
6114          * Unfortunately, loopback_dev is not necessarily the first
6115          * entry in the global dev_base list of net devices.  In fact,
6116          * it is likely to be the very last entry on that list.
6117          * So this causes the notifier registry below to try and
6118          * give link-local addresses to all devices besides loopback_dev
6119          * first, then loopback_dev, which cases all the non-loopback_dev
6120          * devices to fail to get a link-local address.
6121          *
6122          * So, as a temporary fix, allocate the ipv6 structure for
6123          * loopback_dev first by hand.
6124          * Longer term, all of the dependencies ipv6 has upon the loopback
6125          * device and it being up should be removed.
6126          */
6127         rtnl_lock();
6128         idev = ipv6_add_dev(init_net.loopback_dev);
6129         rtnl_unlock();
6130         if (IS_ERR(idev)) {
6131                 err = PTR_ERR(idev);
6132                 goto errlo;
6133         }
6134
6135         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6136                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6137
6138         register_netdevice_notifier(&ipv6_dev_notf);
6139
6140         addrconf_verify();
6141
6142         rtnl_af_register(&inet6_ops);
6143
6144         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6145                               NULL);
6146         if (err < 0)
6147                 goto errout;
6148
6149         /* Only the first call to __rtnl_register can fail */
6150         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6151         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6152         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6153                         inet6_dump_ifaddr, NULL);
6154         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6155                         inet6_dump_ifmcaddr, NULL);
6156         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6157                         inet6_dump_ifacaddr, NULL);
6158         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6159                         inet6_netconf_dump_devconf, NULL);
6160
6161         ipv6_addr_label_rtnl_register();
6162
6163         return 0;
6164 errout:
6165         rtnl_af_unregister(&inet6_ops);
6166         unregister_netdevice_notifier(&ipv6_dev_notf);
6167 errlo:
6168         destroy_workqueue(addrconf_wq);
6169 out_nowq:
6170         unregister_pernet_subsys(&addrconf_ops);
6171 out_addrlabel:
6172         ipv6_addr_label_cleanup();
6173 out:
6174         return err;
6175 }
6176
6177 void addrconf_cleanup(void)
6178 {
6179         struct net_device *dev;
6180         int i;
6181
6182         unregister_netdevice_notifier(&ipv6_dev_notf);
6183         unregister_pernet_subsys(&addrconf_ops);
6184         ipv6_addr_label_cleanup();
6185
6186         rtnl_lock();
6187
6188         __rtnl_af_unregister(&inet6_ops);
6189
6190         /* clean dev list */
6191         for_each_netdev(&init_net, dev) {
6192                 if (__in6_dev_get(dev) == NULL)
6193                         continue;
6194                 addrconf_ifdown(dev, 1);
6195         }
6196         addrconf_ifdown(init_net.loopback_dev, 2);
6197
6198         /*
6199          *      Check hash table.
6200          */
6201         spin_lock_bh(&addrconf_hash_lock);
6202         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6203                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6204         spin_unlock_bh(&addrconf_hash_lock);
6205         cancel_delayed_work(&addr_chk_work);
6206         rtnl_unlock();
6207
6208         destroy_workqueue(addrconf_wq);
6209 }