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 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 116 {
 117         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 118         u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
 119         do_div(tmp, 1000000);
 120         return (s32)tmp;
 121 }
 122
 123 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 124 {
 125         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 126         u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
 127         do_div(tmp, 1000000);
 128         if ((s32)tmp > mrt) {
 129                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 130                 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
 131                 do_div(tmp, 1000000);
 132         }
 133         return (s32)tmp;
 134 }
 135
 136 #ifdef CONFIG_SYSCTL
 137 static int addrconf_sysctl_register(struct inet6_dev *idev);
 138 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 139 #else
 140 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 141 {
 142         return 0;
 143 }
 144
 145 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 146 {
 147 }
 148 #endif
 149
 150 static void ipv6_regen_rndid(struct inet6_dev *idev);
 151 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 152
 153 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 154 static int ipv6_count_addresses(struct inet6_dev *idev);
 155 static int ipv6_generate_stable_address(struct in6_addr *addr,
 156                                         u8 dad_count,
 157                                         const struct inet6_dev *idev);
 158
 159 /*
 160  *      Configured unicast address hash table
 161  */
 162 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 163 static DEFINE_SPINLOCK(addrconf_hash_lock);
 164
 165 static void addrconf_verify(void);
 166 static void addrconf_verify_rtnl(void);
 167 static void addrconf_verify_work(struct work_struct *);
 168
 169 static struct workqueue_struct *addrconf_wq;
 170 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 171
 172 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 173 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 174
 175 static void addrconf_type_change(struct net_device *dev,
 176                                  unsigned long event);
 177 static int addrconf_ifdown(struct net_device *dev, int how);
 178
 179 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 180                                                   int plen,
 181                                                   const struct net_device *dev,
 182                                                   u32 flags, u32 noflags);
 183
 184 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 185 static void addrconf_dad_work(struct work_struct *w);
 186 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
 187 static void addrconf_dad_run(struct inet6_dev *idev);
 188 static void addrconf_rs_timer(unsigned long data);
 189 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 190 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 191
 192 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 193                                 struct prefix_info *pinfo);
 194 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 195                                struct net_device *dev);
 196
 197 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 198         .forwarding             = 0,
 199         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 200         .mtu6                   = IPV6_MIN_MTU,
 201         .accept_ra              = 1,
 202         .accept_redirects       = 1,
 203         .autoconf               = 1,
 204         .force_mld_version      = 0,
 205         .mldv1_unsolicited_report_interval = 10 * HZ,
 206         .mldv2_unsolicited_report_interval = HZ,
 207         .dad_transmits          = 1,
 208         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 209         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 210         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 211         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 212         .use_tempaddr           = 0,
 213         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 214         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 215         .regen_max_retry        = REGEN_MAX_RETRY,
 216         .max_desync_factor      = MAX_DESYNC_FACTOR,
 217         .max_addresses          = IPV6_MAX_ADDRESSES,
 218         .accept_ra_defrtr       = 1,
 219         .accept_ra_from_local   = 0,
 220         .accept_ra_min_hop_limit= 1,
 221         .accept_ra_pinfo        = 1,
 222 #ifdef CONFIG_IPV6_ROUTER_PREF
 223         .accept_ra_rtr_pref     = 1,
 224         .rtr_probe_interval     = 60 * HZ,
 225 #ifdef CONFIG_IPV6_ROUTE_INFO
 226         .accept_ra_rt_info_max_plen = 0,
 227 #endif
 228 #endif
 229         .proxy_ndp              = 0,
 230         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 231         .disable_ipv6           = 0,
 232         .accept_dad             = 1,
 233         .suppress_frag_ndisc    = 1,
 234         .accept_ra_mtu          = 1,
 235         .stable_secret          = {
 236                 .initialized = false,
 237         },
 238         .use_oif_addrs_only     = 0,
 239         .ignore_routes_with_linkdown = 0,
 240         .keep_addr_on_down      = 0,
 241         .seg6_enabled           = 0,
 242 #ifdef CONFIG_IPV6_SEG6_HMAC
 243         .seg6_require_hmac      = 0,
 244 #endif
 245         .enhanced_dad           = 1,
 246         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 247 };
 248
 249 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 250         .forwarding             = 0,
 251         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 252         .mtu6                   = IPV6_MIN_MTU,
 253         .accept_ra              = 1,
 254         .accept_redirects       = 1,
 255         .autoconf               = 1,
 256         .force_mld_version      = 0,
 257         .mldv1_unsolicited_report_interval = 10 * HZ,
 258         .mldv2_unsolicited_report_interval = HZ,
 259         .dad_transmits          = 1,
 260         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 261         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 262         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 263         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 264         .use_tempaddr           = 0,
 265         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 266         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 267         .regen_max_retry        = REGEN_MAX_RETRY,
 268         .max_desync_factor      = MAX_DESYNC_FACTOR,
 269         .max_addresses          = IPV6_MAX_ADDRESSES,
 270         .accept_ra_defrtr       = 1,
 271         .accept_ra_from_local   = 0,
 272         .accept_ra_min_hop_limit= 1,
 273         .accept_ra_pinfo        = 1,
 274 #ifdef CONFIG_IPV6_ROUTER_PREF
 275         .accept_ra_rtr_pref     = 1,
 276         .rtr_probe_interval     = 60 * HZ,
 277 #ifdef CONFIG_IPV6_ROUTE_INFO
 278         .accept_ra_rt_info_max_plen = 0,
 279 #endif
 280 #endif
 281         .proxy_ndp              = 0,
 282         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 283         .disable_ipv6           = 0,
 284         .accept_dad             = 1,
 285         .suppress_frag_ndisc    = 1,
 286         .accept_ra_mtu          = 1,
 287         .stable_secret          = {
 288                 .initialized = false,
 289         },
 290         .use_oif_addrs_only     = 0,
 291         .ignore_routes_with_linkdown = 0,
 292         .keep_addr_on_down      = 0,
 293         .seg6_enabled           = 0,
 294 #ifdef CONFIG_IPV6_SEG6_HMAC
 295         .seg6_require_hmac      = 0,
 296 #endif
 297         .enhanced_dad           = 1,
 298         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 299 };
 300
 301 /* Check if a valid qdisc is available */
 302 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 303 {
 304         return !qdisc_tx_is_noop(dev);
 305 }
 306
 307 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 308 {
 309         if (del_timer(&idev->rs_timer))
 310                 __in6_dev_put(idev);
 311 }
 312
 313 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 314 {
 315         if (cancel_delayed_work(&ifp->dad_work))
 316                 __in6_ifa_put(ifp);
 317 }
 318
 319 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 320                                   unsigned long when)
 321 {
 322         if (!timer_pending(&idev->rs_timer))
 323                 in6_dev_hold(idev);
 324         mod_timer(&idev->rs_timer, jiffies + when);
 325 }
 326
 327 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 328                                    unsigned long delay)
 329 {
 330         if (!delayed_work_pending(&ifp->dad_work))
 331                 in6_ifa_hold(ifp);
 332         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 333 }
 334
 335 static int snmp6_alloc_dev(struct inet6_dev *idev)
 336 {
 337         int i;
 338
 339         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 340         if (!idev->stats.ipv6)
 341                 goto err_ip;
 342
 343         for_each_possible_cpu(i) {
 344                 struct ipstats_mib *addrconf_stats;
 345                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 346                 u64_stats_init(&addrconf_stats->syncp);
 347         }
 348
 349
 350         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 351                                         GFP_KERNEL);
 352         if (!idev->stats.icmpv6dev)
 353                 goto err_icmp;
 354         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 355                                            GFP_KERNEL);
 356         if (!idev->stats.icmpv6msgdev)
 357                 goto err_icmpmsg;
 358
 359         return 0;
 360
 361 err_icmpmsg:
 362         kfree(idev->stats.icmpv6dev);
 363 err_icmp:
 364         free_percpu(idev->stats.ipv6);
 365 err_ip:
 366         return -ENOMEM;
 367 }
 368
 369 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 370 {
 371         struct inet6_dev *ndev;
 372         int err = -ENOMEM;
 373
 374         ASSERT_RTNL();
 375
 376         if (dev->mtu < IPV6_MIN_MTU)
 377                 return ERR_PTR(-EINVAL);
 378
 379         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 380         if (!ndev)
 381                 return ERR_PTR(err);
 382
 383         rwlock_init(&ndev->lock);
 384         ndev->dev = dev;
 385         INIT_LIST_HEAD(&ndev->addr_list);
 386         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 387                     (unsigned long)ndev);
 388         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 389
 390         if (ndev->cnf.stable_secret.initialized)
 391                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 392         else
 393                 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
 394
 395         ndev->cnf.mtu6 = dev->mtu;
 396         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 397         if (!ndev->nd_parms) {
 398                 kfree(ndev);
 399                 return ERR_PTR(err);
 400         }
 401         if (ndev->cnf.forwarding)
 402                 dev_disable_lro(dev);
 403         /* We refer to the device */
 404         dev_hold(dev);
 405
 406         if (snmp6_alloc_dev(ndev) < 0) {
 407                 ADBG(KERN_WARNING
 408                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 409                         __func__, dev->name);
 410                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 411                 dev_put(dev);
 412                 kfree(ndev);
 413                 return ERR_PTR(err);
 414         }
 415
 416         if (snmp6_register_dev(ndev) < 0) {
 417                 ADBG(KERN_WARNING
 418                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 419                         __func__, dev->name);
 420                 goto err_release;
 421         }
 422
 423         /* One reference from device. */
 424         in6_dev_hold(ndev);
 425
 426         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 427                 ndev->cnf.accept_dad = -1;
 428
 429 #if IS_ENABLED(CONFIG_IPV6_SIT)
 430         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 431                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 432                 ndev->cnf.rtr_solicits = 0;
 433         }
 434 #endif
 435
 436         INIT_LIST_HEAD(&ndev->tempaddr_list);
 437         ndev->desync_factor = U32_MAX;
 438         if ((dev->flags&IFF_LOOPBACK) ||
 439             dev->type == ARPHRD_TUNNEL ||
 440             dev->type == ARPHRD_TUNNEL6 ||
 441             dev->type == ARPHRD_SIT ||
 442             dev->type == ARPHRD_NONE) {
 443                 ndev->cnf.use_tempaddr = -1;
 444         } else
 445                 ipv6_regen_rndid(ndev);
 446
 447         ndev->token = in6addr_any;
 448
 449         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 450                 ndev->if_flags |= IF_READY;
 451
 452         ipv6_mc_init_dev(ndev);
 453         ndev->tstamp = jiffies;
 454         err = addrconf_sysctl_register(ndev);
 455         if (err) {
 456                 ipv6_mc_destroy_dev(ndev);
 457                 snmp6_unregister_dev(ndev);
 458                 goto err_release;
 459         }
 460         /* protected by rtnl_lock */
 461         rcu_assign_pointer(dev->ip6_ptr, ndev);
 462
 463         /* Join interface-local all-node multicast group */
 464         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 465
 466         /* Join all-node multicast group */
 467         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 468
 469         /* Join all-router multicast group if forwarding is set */
 470         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 471                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 472
 473         return ndev;
 474
 475 err_release:
 476         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 477         ndev->dead = 1;
 478         in6_dev_finish_destroy(ndev);
 479         return ERR_PTR(err);
 480 }
 481
 482 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 483 {
 484         struct inet6_dev *idev;
 485
 486         ASSERT_RTNL();
 487
 488         idev = __in6_dev_get(dev);
 489         if (!idev) {
 490                 idev = ipv6_add_dev(dev);
 491                 if (IS_ERR(idev))
 492                         return NULL;
 493         }
 494
 495         if (dev->flags&IFF_UP)
 496                 ipv6_mc_up(idev);
 497         return idev;
 498 }
 499
 500 static int inet6_netconf_msgsize_devconf(int type)
 501 {
 502         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 503                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 504         bool all = false;
 505
 506         if (type == NETCONFA_ALL)
 507                 all = true;
 508
 509         if (all || type == NETCONFA_FORWARDING)
 510                 size += nla_total_size(4);
 511 #ifdef CONFIG_IPV6_MROUTE
 512         if (all || type == NETCONFA_MC_FORWARDING)
 513                 size += nla_total_size(4);
 514 #endif
 515         if (all || type == NETCONFA_PROXY_NEIGH)
 516                 size += nla_total_size(4);
 517
 518         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 519                 size += nla_total_size(4);
 520
 521         return size;
 522 }
 523
 524 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 525                                       struct ipv6_devconf *devconf, u32 portid,
 526                                       u32 seq, int event, unsigned int flags,
 527                                       int type)
 528 {
 529         struct nlmsghdr  *nlh;
 530         struct netconfmsg *ncm;
 531         bool all = false;
 532
 533         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 534                         flags);
 535         if (!nlh)
 536                 return -EMSGSIZE;
 537
 538         if (type == NETCONFA_ALL)
 539                 all = true;
 540
 541         ncm = nlmsg_data(nlh);
 542         ncm->ncm_family = AF_INET6;
 543
 544         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 545                 goto nla_put_failure;
 546
 547         if ((all || type == NETCONFA_FORWARDING) &&
 548             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 549                 goto nla_put_failure;
 550 #ifdef CONFIG_IPV6_MROUTE
 551         if ((all || type == NETCONFA_MC_FORWARDING) &&
 552             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 553                         devconf->mc_forwarding) < 0)
 554                 goto nla_put_failure;
 555 #endif
 556         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 557             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 558                 goto nla_put_failure;
 559
 560         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 561             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 562                         devconf->ignore_routes_with_linkdown) < 0)
 563                 goto nla_put_failure;
 564
 565         nlmsg_end(skb, nlh);
 566         return 0;
 567
 568 nla_put_failure:
 569         nlmsg_cancel(skb, nlh);
 570         return -EMSGSIZE;
 571 }
 572
 573 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 574                                   struct ipv6_devconf *devconf)
 575 {
 576         struct sk_buff *skb;
 577         int err = -ENOBUFS;
 578
 579         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 580         if (!skb)
 581                 goto errout;
 582
 583         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 584                                          RTM_NEWNETCONF, 0, type);
 585         if (err < 0) {
 586                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 587                 WARN_ON(err == -EMSGSIZE);
 588                 kfree_skb(skb);
 589                 goto errout;
 590         }
 591         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 592         return;
 593 errout:
 594         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 595 }
 596
 597 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 598         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 599         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 600         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 601         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 602 };
 603
 604 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 605                                      struct nlmsghdr *nlh)
 606 {
 607         struct net *net = sock_net(in_skb->sk);
 608         struct nlattr *tb[NETCONFA_MAX+1];
 609         struct netconfmsg *ncm;
 610         struct sk_buff *skb;
 611         struct ipv6_devconf *devconf;
 612         struct inet6_dev *in6_dev;
 613         struct net_device *dev;
 614         int ifindex;
 615         int err;
 616
 617         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 618                           devconf_ipv6_policy);
 619         if (err < 0)
 620                 goto errout;
 621
 622         err = -EINVAL;
 623         if (!tb[NETCONFA_IFINDEX])
 624                 goto errout;
 625
 626         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 627         switch (ifindex) {
 628         case NETCONFA_IFINDEX_ALL:
 629                 devconf = net->ipv6.devconf_all;
 630                 break;
 631         case NETCONFA_IFINDEX_DEFAULT:
 632                 devconf = net->ipv6.devconf_dflt;
 633                 break;
 634         default:
 635                 dev = __dev_get_by_index(net, ifindex);
 636                 if (!dev)
 637                         goto errout;
 638                 in6_dev = __in6_dev_get(dev);
 639                 if (!in6_dev)
 640                         goto errout;
 641                 devconf = &in6_dev->cnf;
 642                 break;
 643         }
 644
 645         err = -ENOBUFS;
 646         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
 647         if (!skb)
 648                 goto errout;
 649
 650         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 651                                          NETLINK_CB(in_skb).portid,
 652                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 653                                          NETCONFA_ALL);
 654         if (err < 0) {
 655                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 656                 WARN_ON(err == -EMSGSIZE);
 657                 kfree_skb(skb);
 658                 goto errout;
 659         }
 660         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 661 errout:
 662         return err;
 663 }
 664
 665 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 666                                       struct netlink_callback *cb)
 667 {
 668         struct net *net = sock_net(skb->sk);
 669         int h, s_h;
 670         int idx, s_idx;
 671         struct net_device *dev;
 672         struct inet6_dev *idev;
 673         struct hlist_head *head;
 674
 675         s_h = cb->args[0];
 676         s_idx = idx = cb->args[1];
 677
 678         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 679                 idx = 0;
 680                 head = &net->dev_index_head[h];
 681                 rcu_read_lock();
 682                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 683                           net->dev_base_seq;
 684                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 685                         if (idx < s_idx)
 686                                 goto cont;
 687                         idev = __in6_dev_get(dev);
 688                         if (!idev)
 689                                 goto cont;
 690
 691                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 692                                                        &idev->cnf,
 693                                                        NETLINK_CB(cb->skb).portid,
 694                                                        cb->nlh->nlmsg_seq,
 695                                                        RTM_NEWNETCONF,
 696                                                        NLM_F_MULTI,
 697                                                        NETCONFA_ALL) < 0) {
 698                                 rcu_read_unlock();
 699                                 goto done;
 700                         }
 701                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 702 cont:
 703                         idx++;
 704                 }
 705                 rcu_read_unlock();
 706         }
 707         if (h == NETDEV_HASHENTRIES) {
 708                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 709                                                net->ipv6.devconf_all,
 710                                                NETLINK_CB(cb->skb).portid,
 711                                                cb->nlh->nlmsg_seq,
 712                                                RTM_NEWNETCONF, NLM_F_MULTI,
 713                                                NETCONFA_ALL) < 0)
 714                         goto done;
 715                 else
 716                         h++;
 717         }
 718         if (h == NETDEV_HASHENTRIES + 1) {
 719                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 720                                                net->ipv6.devconf_dflt,
 721                                                NETLINK_CB(cb->skb).portid,
 722                                                cb->nlh->nlmsg_seq,
 723                                                RTM_NEWNETCONF, NLM_F_MULTI,
 724                                                NETCONFA_ALL) < 0)
 725                         goto done;
 726                 else
 727                         h++;
 728         }
 729 done:
 730         cb->args[0] = h;
 731         cb->args[1] = idx;
 732
 733         return skb->len;
 734 }
 735
 736 #ifdef CONFIG_SYSCTL
 737 static void dev_forward_change(struct inet6_dev *idev)
 738 {
 739         struct net_device *dev;
 740         struct inet6_ifaddr *ifa;
 741
 742         if (!idev)
 743                 return;
 744         dev = idev->dev;
 745         if (idev->cnf.forwarding)
 746                 dev_disable_lro(dev);
 747         if (dev->flags & IFF_MULTICAST) {
 748                 if (idev->cnf.forwarding) {
 749                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 750                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 751                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 752                 } else {
 753                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 754                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 755                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 756                 }
 757         }
 758
 759         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 760                 if (ifa->flags&IFA_F_TENTATIVE)
 761                         continue;
 762                 if (idev->cnf.forwarding)
 763                         addrconf_join_anycast(ifa);
 764                 else
 765                         addrconf_leave_anycast(ifa);
 766         }
 767         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 768                                      dev->ifindex, &idev->cnf);
 769 }
 770
 771
 772 static void addrconf_forward_change(struct net *net, __s32 newf)
 773 {
 774         struct net_device *dev;
 775         struct inet6_dev *idev;
 776
 777         for_each_netdev(net, dev) {
 778                 idev = __in6_dev_get(dev);
 779                 if (idev) {
 780                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 781                         idev->cnf.forwarding = newf;
 782                         if (changed)
 783                                 dev_forward_change(idev);
 784                 }
 785         }
 786 }
 787
 788 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 789 {
 790         struct net *net;
 791         int old;
 792
 793         if (!rtnl_trylock())
 794                 return restart_syscall();
 795
 796         net = (struct net *)table->extra2;
 797         old = *p;
 798         *p = newf;
 799
 800         if (p == &net->ipv6.devconf_dflt->forwarding) {
 801                 if ((!newf) ^ (!old))
 802                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 803                                                      NETCONFA_IFINDEX_DEFAULT,
 804                                                      net->ipv6.devconf_dflt);
 805                 rtnl_unlock();
 806                 return 0;
 807         }
 808
 809         if (p == &net->ipv6.devconf_all->forwarding) {
 810                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 811
 812                 net->ipv6.devconf_dflt->forwarding = newf;
 813                 if ((!newf) ^ (!old_dflt))
 814                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 815                                                      NETCONFA_IFINDEX_DEFAULT,
 816                                                      net->ipv6.devconf_dflt);
 817
 818                 addrconf_forward_change(net, newf);
 819                 if ((!newf) ^ (!old))
 820                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 821                                                      NETCONFA_IFINDEX_ALL,
 822                                                      net->ipv6.devconf_all);
 823         } else if ((!newf) ^ (!old))
 824                 dev_forward_change((struct inet6_dev *)table->extra1);
 825         rtnl_unlock();
 826
 827         if (newf)
 828                 rt6_purge_dflt_routers(net);
 829         return 1;
 830 }
 831
 832 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 833 {
 834         struct net_device *dev;
 835         struct inet6_dev *idev;
 836
 837         for_each_netdev(net, dev) {
 838                 idev = __in6_dev_get(dev);
 839                 if (idev) {
 840                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 841
 842                         idev->cnf.ignore_routes_with_linkdown = newf;
 843                         if (changed)
 844                                 inet6_netconf_notify_devconf(dev_net(dev),
 845                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 846                                                              dev->ifindex,
 847                                                              &idev->cnf);
 848                 }
 849         }
 850 }
 851
 852 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 853 {
 854         struct net *net;
 855         int old;
 856
 857         if (!rtnl_trylock())
 858                 return restart_syscall();
 859
 860         net = (struct net *)table->extra2;
 861         old = *p;
 862         *p = newf;
 863
 864         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 865                 if ((!newf) ^ (!old))
 866                         inet6_netconf_notify_devconf(net,
 867                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 868                                                      NETCONFA_IFINDEX_DEFAULT,
 869                                                      net->ipv6.devconf_dflt);
 870                 rtnl_unlock();
 871                 return 0;
 872         }
 873
 874         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 875                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 876                 addrconf_linkdown_change(net, newf);
 877                 if ((!newf) ^ (!old))
 878                         inet6_netconf_notify_devconf(net,
 879                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 880                                                      NETCONFA_IFINDEX_ALL,
 881                                                      net->ipv6.devconf_all);
 882         }
 883         rtnl_unlock();
 884
 885         return 1;
 886 }
 887
 888 #endif
 889
 890 /* Nobody refers to this ifaddr, destroy it */
 891 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 892 {
 893         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 894
 895 #ifdef NET_REFCNT_DEBUG
 896         pr_debug("%s\n", __func__);
 897 #endif
 898
 899         in6_dev_put(ifp->idev);
 900
 901         if (cancel_delayed_work(&ifp->dad_work))
 902                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 903                           ifp);
 904
 905         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 906                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 907                 return;
 908         }
 909         ip6_rt_put(ifp->rt);
 910
 911         kfree_rcu(ifp, rcu);
 912 }
 913
 914 static void
 915 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 916 {
 917         struct list_head *p;
 918         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 919
 920         /*
 921          * Each device address list is sorted in order of scope -
 922          * global before linklocal.
 923          */
 924         list_for_each(p, &idev->addr_list) {
 925                 struct inet6_ifaddr *ifa
 926                         = list_entry(p, struct inet6_ifaddr, if_list);
 927                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 928                         break;
 929         }
 930
 931         list_add_tail(&ifp->if_list, p);
 932 }
 933
 934 static u32 inet6_addr_hash(const struct in6_addr *addr)
 935 {
 936         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 937 }
 938
 939 /* On success it returns ifp with increased reference count */
 940
 941 static struct inet6_ifaddr *
 942 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 943               const struct in6_addr *peer_addr, int pfxlen,
 944               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 945 {
 946         struct inet6_ifaddr *ifa = NULL;
 947         struct rt6_info *rt;
 948         unsigned int hash;
 949         int err = 0;
 950         int addr_type = ipv6_addr_type(addr);
 951
 952         if (addr_type == IPV6_ADDR_ANY ||
 953             addr_type & IPV6_ADDR_MULTICAST ||
 954             (!(idev->dev->flags & IFF_LOOPBACK) &&
 955              addr_type & IPV6_ADDR_LOOPBACK))
 956                 return ERR_PTR(-EADDRNOTAVAIL);
 957
 958         rcu_read_lock_bh();
 959         if (idev->dead) {
 960                 err = -ENODEV;                  /*XXX*/
 961                 goto out2;
 962         }
 963
 964         if (idev->cnf.disable_ipv6) {
 965                 err = -EACCES;
 966                 goto out2;
 967         }
 968
 969         spin_lock(&addrconf_hash_lock);
 970
 971         /* Ignore adding duplicate addresses on an interface */
 972         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 973                 ADBG("ipv6_add_addr: already assigned\n");
 974                 err = -EEXIST;
 975                 goto out;
 976         }
 977
 978         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 979
 980         if (!ifa) {
 981                 ADBG("ipv6_add_addr: malloc failed\n");
 982                 err = -ENOBUFS;
 983                 goto out;
 984         }
 985
 986         rt = addrconf_dst_alloc(idev, addr, false);
 987         if (IS_ERR(rt)) {
 988                 err = PTR_ERR(rt);
 989                 goto out;
 990         }
 991
 992         neigh_parms_data_state_setall(idev->nd_parms);
 993
 994         ifa->addr = *addr;
 995         if (peer_addr)
 996                 ifa->peer_addr = *peer_addr;
 997
 998         spin_lock_init(&ifa->lock);
 999         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1000         INIT_HLIST_NODE(&ifa->addr_lst);
1001         ifa->scope = scope;
1002         ifa->prefix_len = pfxlen;
1003         ifa->flags = flags | IFA_F_TENTATIVE;
1004         ifa->valid_lft = valid_lft;
1005         ifa->prefered_lft = prefered_lft;
1006         ifa->cstamp = ifa->tstamp = jiffies;
1007         ifa->tokenized = false;
1008
1009         ifa->rt = rt;
1010
1011         ifa->idev = idev;
1012         in6_dev_hold(idev);
1013         /* For caller */
1014         in6_ifa_hold(ifa);
1015
1016         /* Add to big hash table */
1017         hash = inet6_addr_hash(addr);
1018
1019         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1020         spin_unlock(&addrconf_hash_lock);
1021
1022         write_lock(&idev->lock);
1023         /* Add to inet6_dev unicast addr list. */
1024         ipv6_link_dev_addr(idev, ifa);
1025
1026         if (ifa->flags&IFA_F_TEMPORARY) {
1027                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1028                 in6_ifa_hold(ifa);
1029         }
1030
1031         in6_ifa_hold(ifa);
1032         write_unlock(&idev->lock);
1033 out2:
1034         rcu_read_unlock_bh();
1035
1036         if (likely(err == 0))
1037                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1038         else {
1039                 kfree(ifa);
1040                 ifa = ERR_PTR(err);
1041         }
1042
1043         return ifa;
1044 out:
1045         spin_unlock(&addrconf_hash_lock);
1046         goto out2;
1047 }
1048
1049 enum cleanup_prefix_rt_t {
1050         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1051         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1052         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1053 };
1054
1055 /*
1056  * Check, whether the prefix for ifp would still need a prefix route
1057  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1058  * constants.
1059  *
1060  * 1) we don't purge prefix if address was not permanent.
1061  *    prefix is managed by its own lifetime.
1062  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1063  * 3) if there are no addresses, delete prefix.
1064  * 4) if there are still other permanent address(es),
1065  *    corresponding prefix is still permanent.
1066  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1067  *    don't purge the prefix, assume user space is managing it.
1068  * 6) otherwise, update prefix lifetime to the
1069  *    longest valid lifetime among the corresponding
1070  *    addresses on the device.
1071  *    Note: subsequent RA will update lifetime.
1072  **/
1073 static enum cleanup_prefix_rt_t
1074 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1075 {
1076         struct inet6_ifaddr *ifa;
1077         struct inet6_dev *idev = ifp->idev;
1078         unsigned long lifetime;
1079         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1080
1081         *expires = jiffies;
1082
1083         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1084                 if (ifa == ifp)
1085                         continue;
1086                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1087                                        ifp->prefix_len))
1088                         continue;
1089                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1090                         return CLEANUP_PREFIX_RT_NOP;
1091
1092                 action = CLEANUP_PREFIX_RT_EXPIRE;
1093
1094                 spin_lock(&ifa->lock);
1095
1096                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1097                 /*
1098                  * Note: Because this address is
1099                  * not permanent, lifetime <
1100                  * LONG_MAX / HZ here.
1101                  */
1102                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1103                         *expires = ifa->tstamp + lifetime * HZ;
1104                 spin_unlock(&ifa->lock);
1105         }
1106
1107         return action;
1108 }
1109
1110 static void
1111 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1112 {
1113         struct rt6_info *rt;
1114
1115         rt = addrconf_get_prefix_route(&ifp->addr,
1116                                        ifp->prefix_len,
1117                                        ifp->idev->dev,
1118                                        0, RTF_GATEWAY | RTF_DEFAULT);
1119         if (rt) {
1120                 if (del_rt)
1121                         ip6_del_rt(rt);
1122                 else {
1123                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1124                                 rt6_set_expires(rt, expires);
1125                         ip6_rt_put(rt);
1126                 }
1127         }
1128 }
1129
1130
1131 /* This function wants to get referenced ifp and releases it before return */
1132
1133 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1134 {
1135         int state;
1136         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1137         unsigned long expires;
1138
1139         ASSERT_RTNL();
1140
1141         spin_lock_bh(&ifp->lock);
1142         state = ifp->state;
1143         ifp->state = INET6_IFADDR_STATE_DEAD;
1144         spin_unlock_bh(&ifp->lock);
1145
1146         if (state == INET6_IFADDR_STATE_DEAD)
1147                 goto out;
1148
1149         spin_lock_bh(&addrconf_hash_lock);
1150         hlist_del_init_rcu(&ifp->addr_lst);
1151         spin_unlock_bh(&addrconf_hash_lock);
1152
1153         write_lock_bh(&ifp->idev->lock);
1154
1155         if (ifp->flags&IFA_F_TEMPORARY) {
1156                 list_del(&ifp->tmp_list);
1157                 if (ifp->ifpub) {
1158                         in6_ifa_put(ifp->ifpub);
1159                         ifp->ifpub = NULL;
1160                 }
1161                 __in6_ifa_put(ifp);
1162         }
1163
1164         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1165                 action = check_cleanup_prefix_route(ifp, &expires);
1166
1167         list_del_init(&ifp->if_list);
1168         __in6_ifa_put(ifp);
1169
1170         write_unlock_bh(&ifp->idev->lock);
1171
1172         addrconf_del_dad_work(ifp);
1173
1174         ipv6_ifa_notify(RTM_DELADDR, ifp);
1175
1176         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1177
1178         if (action != CLEANUP_PREFIX_RT_NOP) {
1179                 cleanup_prefix_route(ifp, expires,
1180                         action == CLEANUP_PREFIX_RT_DEL);
1181         }
1182
1183         /* clean up prefsrc entries */
1184         rt6_remove_prefsrc(ifp);
1185 out:
1186         in6_ifa_put(ifp);
1187 }
1188
1189 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1190 {
1191         struct inet6_dev *idev = ifp->idev;
1192         struct in6_addr addr, *tmpaddr;
1193         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1194         unsigned long regen_advance;
1195         int tmp_plen;
1196         int ret = 0;
1197         u32 addr_flags;
1198         unsigned long now = jiffies;
1199         long max_desync_factor;
1200         s32 cnf_temp_preferred_lft;
1201
1202         write_lock_bh(&idev->lock);
1203         if (ift) {
1204                 spin_lock_bh(&ift->lock);
1205                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1206                 spin_unlock_bh(&ift->lock);
1207                 tmpaddr = &addr;
1208         } else {
1209                 tmpaddr = NULL;
1210         }
1211 retry:
1212         in6_dev_hold(idev);
1213         if (idev->cnf.use_tempaddr <= 0) {
1214                 write_unlock_bh(&idev->lock);
1215                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1216                 in6_dev_put(idev);
1217                 ret = -1;
1218                 goto out;
1219         }
1220         spin_lock_bh(&ifp->lock);
1221         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1222                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1223                 spin_unlock_bh(&ifp->lock);
1224                 write_unlock_bh(&idev->lock);
1225                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1226                         __func__);
1227                 in6_dev_put(idev);
1228                 ret = -1;
1229                 goto out;
1230         }
1231         in6_ifa_hold(ifp);
1232         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1233         ipv6_try_regen_rndid(idev, tmpaddr);
1234         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1235         age = (now - ifp->tstamp) / HZ;
1236
1237         regen_advance = idev->cnf.regen_max_retry *
1238                         idev->cnf.dad_transmits *
1239                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1240
1241         /* recalculate max_desync_factor each time and update
1242          * idev->desync_factor if it's larger
1243          */
1244         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1245         max_desync_factor = min_t(__u32,
1246                                   idev->cnf.max_desync_factor,
1247                                   cnf_temp_preferred_lft - regen_advance);
1248
1249         if (unlikely(idev->desync_factor > max_desync_factor)) {
1250                 if (max_desync_factor > 0) {
1251                         get_random_bytes(&idev->desync_factor,
1252                                          sizeof(idev->desync_factor));
1253                         idev->desync_factor %= max_desync_factor;
1254                 } else {
1255                         idev->desync_factor = 0;
1256                 }
1257         }
1258
1259         tmp_valid_lft = min_t(__u32,
1260                               ifp->valid_lft,
1261                               idev->cnf.temp_valid_lft + age);
1262         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1263                             idev->desync_factor;
1264         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1265         tmp_plen = ifp->prefix_len;
1266         tmp_tstamp = ifp->tstamp;
1267         spin_unlock_bh(&ifp->lock);
1268
1269         write_unlock_bh(&idev->lock);
1270
1271         /* A temporary address is created only if this calculated Preferred
1272          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1273          * an implementation must not create a temporary address with a zero
1274          * Preferred Lifetime.
1275          * Use age calculation as in addrconf_verify to avoid unnecessary
1276          * temporary addresses being generated.
1277          */
1278         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1279         if (tmp_prefered_lft <= regen_advance + age) {
1280                 in6_ifa_put(ifp);
1281                 in6_dev_put(idev);
1282                 ret = -1;
1283                 goto out;
1284         }
1285
1286         addr_flags = IFA_F_TEMPORARY;
1287         /* set in addrconf_prefix_rcv() */
1288         if (ifp->flags & IFA_F_OPTIMISTIC)
1289                 addr_flags |= IFA_F_OPTIMISTIC;
1290
1291         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1292                             ipv6_addr_scope(&addr), addr_flags,
1293                             tmp_valid_lft, tmp_prefered_lft);
1294         if (IS_ERR(ift)) {
1295                 in6_ifa_put(ifp);
1296                 in6_dev_put(idev);
1297                 pr_info("%s: retry temporary address regeneration\n", __func__);
1298                 tmpaddr = &addr;
1299                 write_lock_bh(&idev->lock);
1300                 goto retry;
1301         }
1302
1303         spin_lock_bh(&ift->lock);
1304         ift->ifpub = ifp;
1305         ift->cstamp = now;
1306         ift->tstamp = tmp_tstamp;
1307         spin_unlock_bh(&ift->lock);
1308
1309         addrconf_dad_start(ift);
1310         in6_ifa_put(ift);
1311         in6_dev_put(idev);
1312 out:
1313         return ret;
1314 }
1315
1316 /*
1317  *      Choose an appropriate source address (RFC3484)
1318  */
1319 enum {
1320         IPV6_SADDR_RULE_INIT = 0,
1321         IPV6_SADDR_RULE_LOCAL,
1322         IPV6_SADDR_RULE_SCOPE,
1323         IPV6_SADDR_RULE_PREFERRED,
1324 #ifdef CONFIG_IPV6_MIP6
1325         IPV6_SADDR_RULE_HOA,
1326 #endif
1327         IPV6_SADDR_RULE_OIF,
1328         IPV6_SADDR_RULE_LABEL,
1329         IPV6_SADDR_RULE_PRIVACY,
1330         IPV6_SADDR_RULE_ORCHID,
1331         IPV6_SADDR_RULE_PREFIX,
1332 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1333         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1334 #endif
1335         IPV6_SADDR_RULE_MAX
1336 };
1337
1338 struct ipv6_saddr_score {
1339         int                     rule;
1340         int                     addr_type;
1341         struct inet6_ifaddr     *ifa;
1342         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1343         int                     scopedist;
1344         int                     matchlen;
1345 };
1346
1347 struct ipv6_saddr_dst {
1348         const struct in6_addr *addr;
1349         int ifindex;
1350         int scope;
1351         int label;
1352         unsigned int prefs;
1353 };
1354
1355 static inline int ipv6_saddr_preferred(int type)
1356 {
1357         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1358                 return 1;
1359         return 0;
1360 }
1361
1362 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1363 {
1364 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1365         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1366 #else
1367         return false;
1368 #endif
1369 }
1370
1371 static int ipv6_get_saddr_eval(struct net *net,
1372                                struct ipv6_saddr_score *score,
1373                                struct ipv6_saddr_dst *dst,
1374                                int i)
1375 {
1376         int ret;
1377
1378         if (i <= score->rule) {
1379                 switch (i) {
1380                 case IPV6_SADDR_RULE_SCOPE:
1381                         ret = score->scopedist;
1382                         break;
1383                 case IPV6_SADDR_RULE_PREFIX:
1384                         ret = score->matchlen;
1385                         break;
1386                 default:
1387                         ret = !!test_bit(i, score->scorebits);
1388                 }
1389                 goto out;
1390         }
1391
1392         switch (i) {
1393         case IPV6_SADDR_RULE_INIT:
1394                 /* Rule 0: remember if hiscore is not ready yet */
1395                 ret = !!score->ifa;
1396                 break;
1397         case IPV6_SADDR_RULE_LOCAL:
1398                 /* Rule 1: Prefer same address */
1399                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1400                 break;
1401         case IPV6_SADDR_RULE_SCOPE:
1402                 /* Rule 2: Prefer appropriate scope
1403                  *
1404                  *      ret
1405                  *       ^
1406                  *    -1 |  d 15
1407                  *    ---+--+-+---> scope
1408                  *       |
1409                  *       |             d is scope of the destination.
1410                  *  B-d  |  \
1411                  *       |   \      <- smaller scope is better if
1412                  *  B-15 |    \        if scope is enough for destination.
1413                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1414                  * d-C-1 | /
1415                  *       |/         <- greater is better
1416                  *   -C  /             if scope is not enough for destination.
1417                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1418                  *
1419                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1420                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1421                  * Assume B = 0 and we get C > 29.
1422                  */
1423                 ret = __ipv6_addr_src_scope(score->addr_type);
1424                 if (ret >= dst->scope)
1425                         ret = -ret;
1426                 else
1427                         ret -= 128;     /* 30 is enough */
1428                 score->scopedist = ret;
1429                 break;
1430         case IPV6_SADDR_RULE_PREFERRED:
1431             {
1432                 /* Rule 3: Avoid deprecated and optimistic addresses */
1433                 u8 avoid = IFA_F_DEPRECATED;
1434
1435                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1436                         avoid |= IFA_F_OPTIMISTIC;
1437                 ret = ipv6_saddr_preferred(score->addr_type) ||
1438                       !(score->ifa->flags & avoid);
1439                 break;
1440             }
1441 #ifdef CONFIG_IPV6_MIP6
1442         case IPV6_SADDR_RULE_HOA:
1443             {
1444                 /* Rule 4: Prefer home address */
1445                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1446                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1447                 break;
1448             }
1449 #endif
1450         case IPV6_SADDR_RULE_OIF:
1451                 /* Rule 5: Prefer outgoing interface */
1452                 ret = (!dst->ifindex ||
1453                        dst->ifindex == score->ifa->idev->dev->ifindex);
1454                 break;
1455         case IPV6_SADDR_RULE_LABEL:
1456                 /* Rule 6: Prefer matching label */
1457                 ret = ipv6_addr_label(net,
1458                                       &score->ifa->addr, score->addr_type,
1459                                       score->ifa->idev->dev->ifindex) == dst->label;
1460                 break;
1461         case IPV6_SADDR_RULE_PRIVACY:
1462             {
1463                 /* Rule 7: Prefer public address
1464                  * Note: prefer temporary address if use_tempaddr >= 2
1465                  */
1466                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1467                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1468                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1469                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1470                 break;
1471             }
1472         case IPV6_SADDR_RULE_ORCHID:
1473                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1474                  *          non-ORCHID vs non-ORCHID
1475                  */
1476                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1477                         ipv6_addr_orchid(dst->addr));
1478                 break;
1479         case IPV6_SADDR_RULE_PREFIX:
1480                 /* Rule 8: Use longest matching prefix */
1481                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1482                 if (ret > score->ifa->prefix_len)
1483                         ret = score->ifa->prefix_len;
1484                 score->matchlen = ret;
1485                 break;
1486 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1487         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1488                 /* Optimistic addresses still have lower precedence than other
1489                  * preferred addresses.
1490                  */
1491                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1492                 break;
1493 #endif
1494         default:
1495                 ret = 0;
1496         }
1497
1498         if (ret)
1499                 __set_bit(i, score->scorebits);
1500         score->rule = i;
1501 out:
1502         return ret;
1503 }
1504
1505 static int __ipv6_dev_get_saddr(struct net *net,
1506                                 struct ipv6_saddr_dst *dst,
1507                                 struct inet6_dev *idev,
1508                                 struct ipv6_saddr_score *scores,
1509                                 int hiscore_idx)
1510 {
1511         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1512
1513         read_lock_bh(&idev->lock);
1514         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1515                 int i;
1516
1517                 /*
1518                  * - Tentative Address (RFC2462 section 5.4)
1519                  *  - A tentative address is not considered
1520                  *    "assigned to an interface" in the traditional
1521                  *    sense, unless it is also flagged as optimistic.
1522                  * - Candidate Source Address (section 4)
1523                  *  - In any case, anycast addresses, multicast
1524                  *    addresses, and the unspecified address MUST
1525                  *    NOT be included in a candidate set.
1526                  */
1527                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1528                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1529                         continue;
1530
1531                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1532
1533                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1534                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1535                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1536                                             idev->dev->name);
1537                         continue;
1538                 }
1539
1540                 score->rule = -1;
1541                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1542
1543                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1544                         int minihiscore, miniscore;
1545
1546                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1547                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1548
1549                         if (minihiscore > miniscore) {
1550                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1551                                     score->scopedist > 0) {
1552                                         /*
1553                                          * special case:
1554                                          * each remaining entry
1555                                          * has too small (not enough)
1556                                          * scope, because ifa entries
1557                                          * are sorted by their scope
1558                                          * values.
1559                                          */
1560                                         goto out;
1561                                 }
1562                                 break;
1563                         } else if (minihiscore < miniscore) {
1564                                 if (hiscore->ifa)
1565                                         in6_ifa_put(hiscore->ifa);
1566
1567                                 in6_ifa_hold(score->ifa);
1568
1569                                 swap(hiscore, score);
1570                                 hiscore_idx = 1 - hiscore_idx;
1571
1572                                 /* restore our iterator */
1573                                 score->ifa = hiscore->ifa;
1574
1575                                 break;
1576                         }
1577                 }
1578         }
1579 out:
1580         read_unlock_bh(&idev->lock);
1581         return hiscore_idx;
1582 }
1583
1584 static int ipv6_get_saddr_master(struct net *net,
1585                                  const struct net_device *dst_dev,
1586                                  const struct net_device *master,
1587                                  struct ipv6_saddr_dst *dst,
1588                                  struct ipv6_saddr_score *scores,
1589                                  int hiscore_idx)
1590 {
1591         struct inet6_dev *idev;
1592
1593         idev = __in6_dev_get(dst_dev);
1594         if (idev)
1595                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1596                                                    scores, hiscore_idx);
1597
1598         idev = __in6_dev_get(master);
1599         if (idev)
1600                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1601                                                    scores, hiscore_idx);
1602
1603         return hiscore_idx;
1604 }
1605
1606 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1607                        const struct in6_addr *daddr, unsigned int prefs,
1608                        struct in6_addr *saddr)
1609 {
1610         struct ipv6_saddr_score scores[2], *hiscore;
1611         struct ipv6_saddr_dst dst;
1612         struct inet6_dev *idev;
1613         struct net_device *dev;
1614         int dst_type;
1615         bool use_oif_addr = false;
1616         int hiscore_idx = 0;
1617
1618         dst_type = __ipv6_addr_type(daddr);
1619         dst.addr = daddr;
1620         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1621         dst.scope = __ipv6_addr_src_scope(dst_type);
1622         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1623         dst.prefs = prefs;
1624
1625         scores[hiscore_idx].rule = -1;
1626         scores[hiscore_idx].ifa = NULL;
1627
1628         rcu_read_lock();
1629
1630         /* Candidate Source Address (section 4)
1631          *  - multicast and link-local destination address,
1632          *    the set of candidate source address MUST only
1633          *    include addresses assigned to interfaces
1634          *    belonging to the same link as the outgoing
1635          *    interface.
1636          * (- For site-local destination addresses, the
1637          *    set of candidate source addresses MUST only
1638          *    include addresses assigned to interfaces
1639          *    belonging to the same site as the outgoing
1640          *    interface.)
1641          *  - "It is RECOMMENDED that the candidate source addresses
1642          *    be the set of unicast addresses assigned to the
1643          *    interface that will be used to send to the destination
1644          *    (the 'outgoing' interface)." (RFC 6724)
1645          */
1646         if (dst_dev) {
1647                 idev = __in6_dev_get(dst_dev);
1648                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1649                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1650                     (idev && idev->cnf.use_oif_addrs_only)) {
1651                         use_oif_addr = true;
1652                 }
1653         }
1654
1655         if (use_oif_addr) {
1656                 if (idev)
1657                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1658         } else {
1659                 const struct net_device *master;
1660                 int master_idx = 0;
1661
1662                 /* if dst_dev exists and is enslaved to an L3 device, then
1663                  * prefer addresses from dst_dev and then the master over
1664                  * any other enslaved devices in the L3 domain.
1665                  */
1666                 master = l3mdev_master_dev_rcu(dst_dev);
1667                 if (master) {
1668                         master_idx = master->ifindex;
1669
1670                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1671                                                             master, &dst,
1672                                                             scores, hiscore_idx);
1673
1674                         if (scores[hiscore_idx].ifa)
1675                                 goto out;
1676                 }
1677
1678                 for_each_netdev_rcu(net, dev) {
1679                         /* only consider addresses on devices in the
1680                          * same L3 domain
1681                          */
1682                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1683                                 continue;
1684                         idev = __in6_dev_get(dev);
1685                         if (!idev)
1686                                 continue;
1687                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1688                 }
1689         }
1690
1691 out:
1692         rcu_read_unlock();
1693
1694         hiscore = &scores[hiscore_idx];
1695         if (!hiscore->ifa)
1696                 return -EADDRNOTAVAIL;
1697
1698         *saddr = hiscore->ifa->addr;
1699         in6_ifa_put(hiscore->ifa);
1700         return 0;
1701 }
1702 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1703
1704 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1705                       u32 banned_flags)
1706 {
1707         struct inet6_ifaddr *ifp;
1708         int err = -EADDRNOTAVAIL;
1709
1710         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1711                 if (ifp->scope > IFA_LINK)
1712                         break;
1713                 if (ifp->scope == IFA_LINK &&
1714                     !(ifp->flags & banned_flags)) {
1715                         *addr = ifp->addr;
1716                         err = 0;
1717                         break;
1718                 }
1719         }
1720         return err;
1721 }
1722
1723 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1724                     u32 banned_flags)
1725 {
1726         struct inet6_dev *idev;
1727         int err = -EADDRNOTAVAIL;
1728
1729         rcu_read_lock();
1730         idev = __in6_dev_get(dev);
1731         if (idev) {
1732                 read_lock_bh(&idev->lock);
1733                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1734                 read_unlock_bh(&idev->lock);
1735         }
1736         rcu_read_unlock();
1737         return err;
1738 }
1739
1740 static int ipv6_count_addresses(struct inet6_dev *idev)
1741 {
1742         int cnt = 0;
1743         struct inet6_ifaddr *ifp;
1744
1745         read_lock_bh(&idev->lock);
1746         list_for_each_entry(ifp, &idev->addr_list, if_list)
1747                 cnt++;
1748         read_unlock_bh(&idev->lock);
1749         return cnt;
1750 }
1751
1752 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1753                   const struct net_device *dev, int strict)
1754 {
1755         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1756 }
1757 EXPORT_SYMBOL(ipv6_chk_addr);
1758
1759 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1760                             const struct net_device *dev, int strict,
1761                             u32 banned_flags)
1762 {
1763         struct inet6_ifaddr *ifp;
1764         unsigned int hash = inet6_addr_hash(addr);
1765         u32 ifp_flags;
1766
1767         rcu_read_lock_bh();
1768         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1769                 if (!net_eq(dev_net(ifp->idev->dev), net))
1770                         continue;
1771                 /* Decouple optimistic from tentative for evaluation here.
1772                  * Ban optimistic addresses explicitly, when required.
1773                  */
1774                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1775                             ? (ifp->flags&~IFA_F_TENTATIVE)
1776                             : ifp->flags;
1777                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1778                     !(ifp_flags&banned_flags) &&
1779                     (!dev || ifp->idev->dev == dev ||
1780                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1781                         rcu_read_unlock_bh();
1782                         return 1;
1783                 }
1784         }
1785
1786         rcu_read_unlock_bh();
1787         return 0;
1788 }
1789 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1790
1791 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1792                                struct net_device *dev)
1793 {
1794         unsigned int hash = inet6_addr_hash(addr);
1795         struct inet6_ifaddr *ifp;
1796
1797         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1798                 if (!net_eq(dev_net(ifp->idev->dev), net))
1799                         continue;
1800                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1801                         if (!dev || ifp->idev->dev == dev)
1802                                 return true;
1803                 }
1804         }
1805         return false;
1806 }
1807
1808 /* Compares an address/prefix_len with addresses on device @dev.
1809  * If one is found it returns true.
1810  */
1811 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1812         const unsigned int prefix_len, struct net_device *dev)
1813 {
1814         struct inet6_dev *idev;
1815         struct inet6_ifaddr *ifa;
1816         bool ret = false;
1817
1818         rcu_read_lock();
1819         idev = __in6_dev_get(dev);
1820         if (idev) {
1821                 read_lock_bh(&idev->lock);
1822                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1823                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1824                         if (ret)
1825                                 break;
1826                 }
1827                 read_unlock_bh(&idev->lock);
1828         }
1829         rcu_read_unlock();
1830
1831         return ret;
1832 }
1833 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1834
1835 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1836 {
1837         struct inet6_dev *idev;
1838         struct inet6_ifaddr *ifa;
1839         int     onlink;
1840
1841         onlink = 0;
1842         rcu_read_lock();
1843         idev = __in6_dev_get(dev);
1844         if (idev) {
1845                 read_lock_bh(&idev->lock);
1846                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1847                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1848                                                    ifa->prefix_len);
1849                         if (onlink)
1850                                 break;
1851                 }
1852                 read_unlock_bh(&idev->lock);
1853         }
1854         rcu_read_unlock();
1855         return onlink;
1856 }
1857 EXPORT_SYMBOL(ipv6_chk_prefix);
1858
1859 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1860                                      struct net_device *dev, int strict)
1861 {
1862         struct inet6_ifaddr *ifp, *result = NULL;
1863         unsigned int hash = inet6_addr_hash(addr);
1864
1865         rcu_read_lock_bh();
1866         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1867                 if (!net_eq(dev_net(ifp->idev->dev), net))
1868                         continue;
1869                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1870                         if (!dev || ifp->idev->dev == dev ||
1871                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1872                                 result = ifp;
1873                                 in6_ifa_hold(ifp);
1874                                 break;
1875                         }
1876                 }
1877         }
1878         rcu_read_unlock_bh();
1879
1880         return result;
1881 }
1882
1883 /* Gets referenced address, destroys ifaddr */
1884
1885 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1886 {
1887         if (dad_failed)
1888                 ifp->flags |= IFA_F_DADFAILED;
1889
1890         if (ifp->flags&IFA_F_PERMANENT) {
1891                 spin_lock_bh(&ifp->lock);
1892                 addrconf_del_dad_work(ifp);
1893                 ifp->flags |= IFA_F_TENTATIVE;
1894                 spin_unlock_bh(&ifp->lock);
1895                 if (dad_failed)
1896                         ipv6_ifa_notify(0, ifp);
1897                 in6_ifa_put(ifp);
1898         } else if (ifp->flags&IFA_F_TEMPORARY) {
1899                 struct inet6_ifaddr *ifpub;
1900                 spin_lock_bh(&ifp->lock);
1901                 ifpub = ifp->ifpub;
1902                 if (ifpub) {
1903                         in6_ifa_hold(ifpub);
1904                         spin_unlock_bh(&ifp->lock);
1905                         ipv6_create_tempaddr(ifpub, ifp);
1906                         in6_ifa_put(ifpub);
1907                 } else {
1908                         spin_unlock_bh(&ifp->lock);
1909                 }
1910                 ipv6_del_addr(ifp);
1911         } else {
1912                 ipv6_del_addr(ifp);
1913         }
1914 }
1915
1916 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1917 {
1918         int err = -ENOENT;
1919
1920         spin_lock_bh(&ifp->lock);
1921         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1922                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1923                 err = 0;
1924         }
1925         spin_unlock_bh(&ifp->lock);
1926
1927         return err;
1928 }
1929
1930 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1931 {
1932         struct inet6_dev *idev = ifp->idev;
1933         struct net *net = dev_net(ifp->idev->dev);
1934
1935         if (addrconf_dad_end(ifp)) {
1936                 in6_ifa_put(ifp);
1937                 return;
1938         }
1939
1940         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1941                              ifp->idev->dev->name, &ifp->addr);
1942
1943         spin_lock_bh(&ifp->lock);
1944
1945         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1946                 int scope = ifp->scope;
1947                 u32 flags = ifp->flags;
1948                 struct in6_addr new_addr;
1949                 struct inet6_ifaddr *ifp2;
1950                 u32 valid_lft, preferred_lft;
1951                 int pfxlen = ifp->prefix_len;
1952                 int retries = ifp->stable_privacy_retry + 1;
1953
1954                 if (retries > net->ipv6.sysctl.idgen_retries) {
1955                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1956                                              ifp->idev->dev->name);
1957                         goto errdad;
1958                 }
1959
1960                 new_addr = ifp->addr;
1961                 if (ipv6_generate_stable_address(&new_addr, retries,
1962                                                  idev))
1963                         goto errdad;
1964
1965                 valid_lft = ifp->valid_lft;
1966                 preferred_lft = ifp->prefered_lft;
1967
1968                 spin_unlock_bh(&ifp->lock);
1969
1970                 if (idev->cnf.max_addresses &&
1971                     ipv6_count_addresses(idev) >=
1972                     idev->cnf.max_addresses)
1973                         goto lock_errdad;
1974
1975                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1976                                      ifp->idev->dev->name);
1977
1978                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1979                                      scope, flags, valid_lft,
1980                                      preferred_lft);
1981                 if (IS_ERR(ifp2))
1982                         goto lock_errdad;
1983
1984                 spin_lock_bh(&ifp2->lock);
1985                 ifp2->stable_privacy_retry = retries;
1986                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1987                 spin_unlock_bh(&ifp2->lock);
1988
1989                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1990                 in6_ifa_put(ifp2);
1991 lock_errdad:
1992                 spin_lock_bh(&ifp->lock);
1993         }
1994
1995 errdad:
1996         /* transition from _POSTDAD to _ERRDAD */
1997         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1998         spin_unlock_bh(&ifp->lock);
1999
2000         addrconf_mod_dad_work(ifp, 0);
2001         in6_ifa_put(ifp);
2002 }
2003
2004 /* Join to solicited addr multicast group.
2005  * caller must hold RTNL */
2006 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2007 {
2008         struct in6_addr maddr;
2009
2010         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2011                 return;
2012
2013         addrconf_addr_solict_mult(addr, &maddr);
2014         ipv6_dev_mc_inc(dev, &maddr);
2015 }
2016
2017 /* caller must hold RTNL */
2018 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2019 {
2020         struct in6_addr maddr;
2021
2022         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2023                 return;
2024
2025         addrconf_addr_solict_mult(addr, &maddr);
2026         __ipv6_dev_mc_dec(idev, &maddr);
2027 }
2028
2029 /* caller must hold RTNL */
2030 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2031 {
2032         struct in6_addr addr;
2033
2034         if (ifp->prefix_len >= 127) /* RFC 6164 */
2035                 return;
2036         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2037         if (ipv6_addr_any(&addr))
2038                 return;
2039         __ipv6_dev_ac_inc(ifp->idev, &addr);
2040 }
2041
2042 /* caller must hold RTNL */
2043 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2044 {
2045         struct in6_addr addr;
2046
2047         if (ifp->prefix_len >= 127) /* RFC 6164 */
2048                 return;
2049         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2050         if (ipv6_addr_any(&addr))
2051                 return;
2052         __ipv6_dev_ac_dec(ifp->idev, &addr);
2053 }
2054
2055 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2056 {
2057         if (dev->addr_len != EUI64_ADDR_LEN)
2058                 return -1;
2059         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2060         eui[0] ^= 2;
2061         return 0;
2062 }
2063
2064 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2065 {
2066         union fwnet_hwaddr *ha;
2067
2068         if (dev->addr_len != FWNET_ALEN)
2069                 return -1;
2070
2071         ha = (union fwnet_hwaddr *)dev->dev_addr;
2072
2073         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2074         eui[0] ^= 2;
2075         return 0;
2076 }
2077
2078 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2079 {
2080         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2081         if (dev->addr_len != ARCNET_ALEN)
2082                 return -1;
2083         memset(eui, 0, 7);
2084         eui[7] = *(u8 *)dev->dev_addr;
2085         return 0;
2086 }
2087
2088 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2089 {
2090         if (dev->addr_len != INFINIBAND_ALEN)
2091                 return -1;
2092         memcpy(eui, dev->dev_addr + 12, 8);
2093         eui[0] |= 2;
2094         return 0;
2095 }
2096
2097 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2098 {
2099         if (addr == 0)
2100                 return -1;
2101         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2102                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2103                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2104                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2105                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2106                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2107         eui[1] = 0;
2108         eui[2] = 0x5E;
2109         eui[3] = 0xFE;
2110         memcpy(eui + 4, &addr, 4);
2111         return 0;
2112 }
2113
2114 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2115 {
2116         if (dev->priv_flags & IFF_ISATAP)
2117                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2118         return -1;
2119 }
2120
2121 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2122 {
2123         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2124 }
2125
2126 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2127 {
2128         memcpy(eui, dev->perm_addr, 3);
2129         memcpy(eui + 5, dev->perm_addr + 3, 3);
2130         eui[3] = 0xFF;
2131         eui[4] = 0xFE;
2132         eui[0] ^= 2;
2133         return 0;
2134 }
2135
2136 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2137 {
2138         switch (dev->type) {
2139         case ARPHRD_ETHER:
2140         case ARPHRD_FDDI:
2141                 return addrconf_ifid_eui48(eui, dev);
2142         case ARPHRD_ARCNET:
2143                 return addrconf_ifid_arcnet(eui, dev);
2144         case ARPHRD_INFINIBAND:
2145                 return addrconf_ifid_infiniband(eui, dev);
2146         case ARPHRD_SIT:
2147                 return addrconf_ifid_sit(eui, dev);
2148         case ARPHRD_IPGRE:
2149         case ARPHRD_TUNNEL:
2150                 return addrconf_ifid_gre(eui, dev);
2151         case ARPHRD_6LOWPAN:
2152                 return addrconf_ifid_eui64(eui, dev);
2153         case ARPHRD_IEEE1394:
2154                 return addrconf_ifid_ieee1394(eui, dev);
2155         case ARPHRD_TUNNEL6:
2156         case ARPHRD_IP6GRE:
2157                 return addrconf_ifid_ip6tnl(eui, dev);
2158         }
2159         return -1;
2160 }
2161
2162 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2163 {
2164         int err = -1;
2165         struct inet6_ifaddr *ifp;
2166
2167         read_lock_bh(&idev->lock);
2168         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2169                 if (ifp->scope > IFA_LINK)
2170                         break;
2171                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2172                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2173                         err = 0;
2174                         break;
2175                 }
2176         }
2177         read_unlock_bh(&idev->lock);
2178         return err;
2179 }
2180
2181 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2182 static void ipv6_regen_rndid(struct inet6_dev *idev)
2183 {
2184 regen:
2185         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2186         idev->rndid[0] &= ~0x02;
2187
2188         /*
2189          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2190          * check if generated address is not inappropriate
2191          *
2192          *  - Reserved subnet anycast (RFC 2526)
2193          *      11111101 11....11 1xxxxxxx
2194          *  - ISATAP (RFC4214) 6.1
2195          *      00-00-5E-FE-xx-xx-xx-xx
2196          *  - value 0
2197          *  - XXX: already assigned to an address on the device
2198          */
2199         if (idev->rndid[0] == 0xfd &&
2200             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2201             (idev->rndid[7]&0x80))
2202                 goto regen;
2203         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2204                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2205                         goto regen;
2206                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2207                         goto regen;
2208         }
2209 }
2210
2211 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2212 {
2213         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2214                 ipv6_regen_rndid(idev);
2215 }
2216
2217 /*
2218  *      Add prefix route.
2219  */
2220
2221 static void
2222 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2223                       unsigned long expires, u32 flags)
2224 {
2225         struct fib6_config cfg = {
2226                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2227                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2228                 .fc_ifindex = dev->ifindex,
2229                 .fc_expires = expires,
2230                 .fc_dst_len = plen,
2231                 .fc_flags = RTF_UP | flags,
2232                 .fc_nlinfo.nl_net = dev_net(dev),
2233                 .fc_protocol = RTPROT_KERNEL,
2234         };
2235
2236         cfg.fc_dst = *pfx;
2237
2238         /* Prevent useless cloning on PtP SIT.
2239            This thing is done here expecting that the whole
2240            class of non-broadcast devices need not cloning.
2241          */
2242 #if IS_ENABLED(CONFIG_IPV6_SIT)
2243         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2244                 cfg.fc_flags |= RTF_NONEXTHOP;
2245 #endif
2246
2247         ip6_route_add(&cfg);
2248 }
2249
2250
2251 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2252                                                   int plen,
2253                                                   const struct net_device *dev,
2254                                                   u32 flags, u32 noflags)
2255 {
2256         struct fib6_node *fn;
2257         struct rt6_info *rt = NULL;
2258         struct fib6_table *table;
2259         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2260
2261         table = fib6_get_table(dev_net(dev), tb_id);
2262         if (!table)
2263                 return NULL;
2264
2265         read_lock_bh(&table->tb6_lock);
2266         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2267         if (!fn)
2268                 goto out;
2269
2270         noflags |= RTF_CACHE;
2271         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2272                 if (rt->dst.dev->ifindex != dev->ifindex)
2273                         continue;
2274                 if ((rt->rt6i_flags & flags) != flags)
2275                         continue;
2276                 if ((rt->rt6i_flags & noflags) != 0)
2277                         continue;
2278                 dst_hold(&rt->dst);
2279                 break;
2280         }
2281 out:
2282         read_unlock_bh(&table->tb6_lock);
2283         return rt;
2284 }
2285
2286
2287 /* Create "default" multicast route to the interface */
2288
2289 static void addrconf_add_mroute(struct net_device *dev)
2290 {
2291         struct fib6_config cfg = {
2292                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2293                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2294                 .fc_ifindex = dev->ifindex,
2295                 .fc_dst_len = 8,
2296                 .fc_flags = RTF_UP,
2297                 .fc_nlinfo.nl_net = dev_net(dev),
2298         };
2299
2300         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2301
2302         ip6_route_add(&cfg);
2303 }
2304
2305 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2306 {
2307         struct inet6_dev *idev;
2308
2309         ASSERT_RTNL();
2310
2311         idev = ipv6_find_idev(dev);
2312         if (!idev)
2313                 return ERR_PTR(-ENOBUFS);
2314
2315         if (idev->cnf.disable_ipv6)
2316                 return ERR_PTR(-EACCES);
2317
2318         /* Add default multicast route */
2319         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2320                 addrconf_add_mroute(dev);
2321
2322         return idev;
2323 }
2324
2325 static void manage_tempaddrs(struct inet6_dev *idev,
2326                              struct inet6_ifaddr *ifp,
2327                              __u32 valid_lft, __u32 prefered_lft,
2328                              bool create, unsigned long now)
2329 {
2330         u32 flags;
2331         struct inet6_ifaddr *ift;
2332
2333         read_lock_bh(&idev->lock);
2334         /* update all temporary addresses in the list */
2335         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2336                 int age, max_valid, max_prefered;
2337
2338                 if (ifp != ift->ifpub)
2339                         continue;
2340
2341                 /* RFC 4941 section 3.3:
2342                  * If a received option will extend the lifetime of a public
2343                  * address, the lifetimes of temporary addresses should
2344                  * be extended, subject to the overall constraint that no
2345                  * temporary addresses should ever remain "valid" or "preferred"
2346                  * for a time longer than (TEMP_VALID_LIFETIME) or
2347                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2348                  */
2349                 age = (now - ift->cstamp) / HZ;
2350                 max_valid = idev->cnf.temp_valid_lft - age;
2351                 if (max_valid < 0)
2352                         max_valid = 0;
2353
2354                 max_prefered = idev->cnf.temp_prefered_lft -
2355                                idev->desync_factor - age;
2356                 if (max_prefered < 0)
2357                         max_prefered = 0;
2358
2359                 if (valid_lft > max_valid)
2360                         valid_lft = max_valid;
2361
2362                 if (prefered_lft > max_prefered)
2363                         prefered_lft = max_prefered;
2364
2365                 spin_lock(&ift->lock);
2366                 flags = ift->flags;
2367                 ift->valid_lft = valid_lft;
2368                 ift->prefered_lft = prefered_lft;
2369                 ift->tstamp = now;
2370                 if (prefered_lft > 0)
2371                         ift->flags &= ~IFA_F_DEPRECATED;
2372
2373                 spin_unlock(&ift->lock);
2374                 if (!(flags&IFA_F_TENTATIVE))
2375                         ipv6_ifa_notify(0, ift);
2376         }
2377
2378         if ((create || list_empty(&idev->tempaddr_list)) &&
2379             idev->cnf.use_tempaddr > 0) {
2380                 /* When a new public address is created as described
2381                  * in [ADDRCONF], also create a new temporary address.
2382                  * Also create a temporary address if it's enabled but
2383                  * no temporary address currently exists.
2384                  */
2385                 read_unlock_bh(&idev->lock);
2386                 ipv6_create_tempaddr(ifp, NULL);
2387         } else {
2388                 read_unlock_bh(&idev->lock);
2389         }
2390 }
2391
2392 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2393 {
2394         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2395                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2396 }
2397
2398 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2399                                  const struct prefix_info *pinfo,
2400                                  struct inet6_dev *in6_dev,
2401                                  const struct in6_addr *addr, int addr_type,
2402                                  u32 addr_flags, bool sllao, bool tokenized,
2403                                  __u32 valid_lft, u32 prefered_lft)
2404 {
2405         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2406         int create = 0, update_lft = 0;
2407
2408         if (!ifp && valid_lft) {
2409                 int max_addresses = in6_dev->cnf.max_addresses;
2410
2411 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2412                 if (in6_dev->cnf.optimistic_dad &&
2413                     !net->ipv6.devconf_all->forwarding && sllao)
2414                         addr_flags |= IFA_F_OPTIMISTIC;
2415 #endif
2416
2417                 /* Do not allow to create too much of autoconfigured
2418                  * addresses; this would be too easy way to crash kernel.
2419                  */
2420                 if (!max_addresses ||
2421                     ipv6_count_addresses(in6_dev) < max_addresses)
2422                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2423                                             pinfo->prefix_len,
2424                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2425                                             addr_flags, valid_lft,
2426                                             prefered_lft);
2427
2428                 if (IS_ERR_OR_NULL(ifp))
2429                         return -1;
2430
2431                 update_lft = 0;
2432                 create = 1;
2433                 spin_lock_bh(&ifp->lock);
2434                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2435                 ifp->cstamp = jiffies;
2436                 ifp->tokenized = tokenized;
2437                 spin_unlock_bh(&ifp->lock);
2438                 addrconf_dad_start(ifp);
2439         }
2440
2441         if (ifp) {
2442                 u32 flags;
2443                 unsigned long now;
2444                 u32 stored_lft;
2445
2446                 /* update lifetime (RFC2462 5.5.3 e) */
2447                 spin_lock_bh(&ifp->lock);
2448                 now = jiffies;
2449                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2450                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2451                 else
2452                         stored_lft = 0;
2453                 if (!update_lft && !create && stored_lft) {
2454                         const u32 minimum_lft = min_t(u32,
2455                                 stored_lft, MIN_VALID_LIFETIME);
2456                         valid_lft = max(valid_lft, minimum_lft);
2457
2458                         /* RFC4862 Section 5.5.3e:
2459                          * "Note that the preferred lifetime of the
2460                          *  corresponding address is always reset to
2461                          *  the Preferred Lifetime in the received
2462                          *  Prefix Information option, regardless of
2463                          *  whether the valid lifetime is also reset or
2464                          *  ignored."
2465                          *
2466                          * So we should always update prefered_lft here.
2467                          */
2468                         update_lft = 1;
2469                 }
2470
2471                 if (update_lft) {
2472                         ifp->valid_lft = valid_lft;
2473                         ifp->prefered_lft = prefered_lft;
2474                         ifp->tstamp = now;
2475                         flags = ifp->flags;
2476                         ifp->flags &= ~IFA_F_DEPRECATED;
2477                         spin_unlock_bh(&ifp->lock);
2478
2479                         if (!(flags&IFA_F_TENTATIVE))
2480                                 ipv6_ifa_notify(0, ifp);
2481                 } else
2482                         spin_unlock_bh(&ifp->lock);
2483
2484                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2485                                  create, now);
2486
2487                 in6_ifa_put(ifp);
2488                 addrconf_verify();
2489         }
2490
2491         return 0;
2492 }
2493 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2494
2495 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2496 {
2497         struct prefix_info *pinfo;
2498         __u32 valid_lft;
2499         __u32 prefered_lft;
2500         int addr_type, err;
2501         u32 addr_flags = 0;
2502         struct inet6_dev *in6_dev;
2503         struct net *net = dev_net(dev);
2504
2505         pinfo = (struct prefix_info *) opt;
2506
2507         if (len < sizeof(struct prefix_info)) {
2508                 ADBG("addrconf: prefix option too short\n");
2509                 return;
2510         }
2511
2512         /*
2513          *      Validation checks ([ADDRCONF], page 19)
2514          */
2515
2516         addr_type = ipv6_addr_type(&pinfo->prefix);
2517
2518         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2519                 return;
2520
2521         valid_lft = ntohl(pinfo->valid);
2522         prefered_lft = ntohl(pinfo->prefered);
2523
2524         if (prefered_lft > valid_lft) {
2525                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2526                 return;
2527         }
2528
2529         in6_dev = in6_dev_get(dev);
2530
2531         if (!in6_dev) {
2532                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2533                                     dev->name);
2534                 return;
2535         }
2536
2537         /*
2538          *      Two things going on here:
2539          *      1) Add routes for on-link prefixes
2540          *      2) Configure prefixes with the auto flag set
2541          */
2542
2543         if (pinfo->onlink) {
2544                 struct rt6_info *rt;
2545                 unsigned long rt_expires;
2546
2547                 /* Avoid arithmetic overflow. Really, we could
2548                  * save rt_expires in seconds, likely valid_lft,
2549                  * but it would require division in fib gc, that it
2550                  * not good.
2551                  */
2552                 if (HZ > USER_HZ)
2553                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2554                 else
2555                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2556
2557                 if (addrconf_finite_timeout(rt_expires))
2558                         rt_expires *= HZ;
2559
2560                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2561                                                pinfo->prefix_len,
2562                                                dev,
2563                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2564                                                RTF_GATEWAY | RTF_DEFAULT);
2565
2566                 if (rt) {
2567                         /* Autoconf prefix route */
2568                         if (valid_lft == 0) {
2569                                 ip6_del_rt(rt);
2570                                 rt = NULL;
2571                         } else if (addrconf_finite_timeout(rt_expires)) {
2572                                 /* not infinity */
2573                                 rt6_set_expires(rt, jiffies + rt_expires);
2574                         } else {
2575                                 rt6_clean_expires(rt);
2576                         }
2577                 } else if (valid_lft) {
2578                         clock_t expires = 0;
2579                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2580                         if (addrconf_finite_timeout(rt_expires)) {
2581                                 /* not infinity */
2582                                 flags |= RTF_EXPIRES;
2583                                 expires = jiffies_to_clock_t(rt_expires);
2584                         }
2585                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2586                                               dev, expires, flags);
2587                 }
2588                 ip6_rt_put(rt);
2589         }
2590
2591         /* Try to figure out our local address for this prefix */
2592
2593         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2594                 struct in6_addr addr;
2595                 bool tokenized = false, dev_addr_generated = false;
2596
2597                 if (pinfo->prefix_len == 64) {
2598                         memcpy(&addr, &pinfo->prefix, 8);
2599
2600                         if (!ipv6_addr_any(&in6_dev->token)) {
2601                                 read_lock_bh(&in6_dev->lock);
2602                                 memcpy(addr.s6_addr + 8,
2603                                        in6_dev->token.s6_addr + 8, 8);
2604                                 read_unlock_bh(&in6_dev->lock);
2605                                 tokenized = true;
2606                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2607                                    !ipv6_generate_stable_address(&addr, 0,
2608                                                                  in6_dev)) {
2609                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2610                                 goto ok;
2611                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2612                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2613                                 goto put;
2614                         } else {
2615                                 dev_addr_generated = true;
2616                         }
2617                         goto ok;
2618                 }
2619                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2620                                     pinfo->prefix_len);
2621                 goto put;
2622
2623 ok:
2624                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2625                                                    &addr, addr_type,
2626                                                    addr_flags, sllao,
2627                                                    tokenized, valid_lft,
2628                                                    prefered_lft);
2629                 if (err)
2630                         goto put;
2631
2632                 /* Ignore error case here because previous prefix add addr was
2633                  * successful which will be notified.
2634                  */
2635                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2636                                               addr_type, addr_flags, sllao,
2637                                               tokenized, valid_lft,
2638                                               prefered_lft,
2639                                               dev_addr_generated);
2640         }
2641         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2642 put:
2643         in6_dev_put(in6_dev);
2644 }
2645
2646 /*
2647  *      Set destination address.
2648  *      Special case for SIT interfaces where we create a new "virtual"
2649  *      device.
2650  */
2651 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2652 {
2653         struct in6_ifreq ireq;
2654         struct net_device *dev;
2655         int err = -EINVAL;
2656
2657         rtnl_lock();
2658
2659         err = -EFAULT;
2660         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2661                 goto err_exit;
2662
2663         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2664
2665         err = -ENODEV;
2666         if (!dev)
2667                 goto err_exit;
2668
2669 #if IS_ENABLED(CONFIG_IPV6_SIT)
2670         if (dev->type == ARPHRD_SIT) {
2671                 const struct net_device_ops *ops = dev->netdev_ops;
2672                 struct ifreq ifr;
2673                 struct ip_tunnel_parm p;
2674
2675                 err = -EADDRNOTAVAIL;
2676                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2677                         goto err_exit;
2678
2679                 memset(&p, 0, sizeof(p));
2680                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2681                 p.iph.saddr = 0;
2682                 p.iph.version = 4;
2683                 p.iph.ihl = 5;
2684                 p.iph.protocol = IPPROTO_IPV6;
2685                 p.iph.ttl = 64;
2686                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2687
2688                 if (ops->ndo_do_ioctl) {
2689                         mm_segment_t oldfs = get_fs();
2690
2691                         set_fs(KERNEL_DS);
2692                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2693                         set_fs(oldfs);
2694                 } else
2695                         err = -EOPNOTSUPP;
2696
2697                 if (err == 0) {
2698                         err = -ENOBUFS;
2699                         dev = __dev_get_by_name(net, p.name);
2700                         if (!dev)
2701                                 goto err_exit;
2702                         err = dev_open(dev);
2703                 }
2704         }
2705 #endif
2706
2707 err_exit:
2708         rtnl_unlock();
2709         return err;
2710 }
2711
2712 static int ipv6_mc_config(struct sock *sk, bool join,
2713                           const struct in6_addr *addr, int ifindex)
2714 {
2715         int ret;
2716
2717         ASSERT_RTNL();
2718
2719         lock_sock(sk);
2720         if (join)
2721                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2722         else
2723                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2724         release_sock(sk);
2725
2726         return ret;
2727 }
2728
2729 /*
2730  *      Manual configuration of address on an interface
2731  */
2732 static int inet6_addr_add(struct net *net, int ifindex,
2733                           const struct in6_addr *pfx,
2734                           const struct in6_addr *peer_pfx,
2735                           unsigned int plen, __u32 ifa_flags,
2736                           __u32 prefered_lft, __u32 valid_lft)
2737 {
2738         struct inet6_ifaddr *ifp;
2739         struct inet6_dev *idev;
2740         struct net_device *dev;
2741         unsigned long timeout;
2742         clock_t expires;
2743         int scope;
2744         u32 flags;
2745
2746         ASSERT_RTNL();
2747
2748         if (plen > 128)
2749                 return -EINVAL;
2750
2751         /* check the lifetime */
2752         if (!valid_lft || prefered_lft > valid_lft)
2753                 return -EINVAL;
2754
2755         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2756                 return -EINVAL;
2757
2758         dev = __dev_get_by_index(net, ifindex);
2759         if (!dev)
2760                 return -ENODEV;
2761
2762         idev = addrconf_add_dev(dev);
2763         if (IS_ERR(idev))
2764                 return PTR_ERR(idev);
2765
2766         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2767                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2768                                          true, pfx, ifindex);
2769
2770                 if (ret < 0)
2771                         return ret;
2772         }
2773
2774         scope = ipv6_addr_scope(pfx);
2775
2776         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2777         if (addrconf_finite_timeout(timeout)) {
2778                 expires = jiffies_to_clock_t(timeout * HZ);
2779                 valid_lft = timeout;
2780                 flags = RTF_EXPIRES;
2781         } else {
2782                 expires = 0;
2783                 flags = 0;
2784                 ifa_flags |= IFA_F_PERMANENT;
2785         }
2786
2787         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2788         if (addrconf_finite_timeout(timeout)) {
2789                 if (timeout == 0)
2790                         ifa_flags |= IFA_F_DEPRECATED;
2791                 prefered_lft = timeout;
2792         }
2793
2794         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2795                             valid_lft, prefered_lft);
2796
2797         if (!IS_ERR(ifp)) {
2798                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2799                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2800                                               expires, flags);
2801                 }
2802
2803                 /*
2804                  * Note that section 3.1 of RFC 4429 indicates
2805                  * that the Optimistic flag should not be set for
2806                  * manually configured addresses
2807                  */
2808                 addrconf_dad_start(ifp);
2809                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2810                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2811                                          true, jiffies);
2812                 in6_ifa_put(ifp);
2813                 addrconf_verify_rtnl();
2814                 return 0;
2815         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2816                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2817                                false, pfx, ifindex);
2818         }
2819
2820         return PTR_ERR(ifp);
2821 }
2822
2823 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2824                           const struct in6_addr *pfx, unsigned int plen)
2825 {
2826         struct inet6_ifaddr *ifp;
2827         struct inet6_dev *idev;
2828         struct net_device *dev;
2829
2830         if (plen > 128)
2831                 return -EINVAL;
2832
2833         dev = __dev_get_by_index(net, ifindex);
2834         if (!dev)
2835                 return -ENODEV;
2836
2837         idev = __in6_dev_get(dev);
2838         if (!idev)
2839                 return -ENXIO;
2840
2841         read_lock_bh(&idev->lock);
2842         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2843                 if (ifp->prefix_len == plen &&
2844                     ipv6_addr_equal(pfx, &ifp->addr)) {
2845                         in6_ifa_hold(ifp);
2846                         read_unlock_bh(&idev->lock);
2847
2848                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2849                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2850                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2851                                                  jiffies);
2852                         ipv6_del_addr(ifp);
2853                         addrconf_verify_rtnl();
2854                         if (ipv6_addr_is_multicast(pfx)) {
2855                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2856                                                false, pfx, dev->ifindex);
2857                         }
2858                         return 0;
2859                 }
2860         }
2861         read_unlock_bh(&idev->lock);
2862         return -EADDRNOTAVAIL;
2863 }
2864
2865
2866 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2867 {
2868         struct in6_ifreq ireq;
2869         int err;
2870
2871         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2872                 return -EPERM;
2873
2874         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2875                 return -EFAULT;
2876
2877         rtnl_lock();
2878         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2879                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2880                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2881         rtnl_unlock();
2882         return err;
2883 }
2884
2885 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2886 {
2887         struct in6_ifreq ireq;
2888         int err;
2889
2890         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2891                 return -EPERM;
2892
2893         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2894                 return -EFAULT;
2895
2896         rtnl_lock();
2897         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2898                              ireq.ifr6_prefixlen);
2899         rtnl_unlock();
2900         return err;
2901 }
2902
2903 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2904                      int plen, int scope)
2905 {
2906         struct inet6_ifaddr *ifp;
2907
2908         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2909                             scope, IFA_F_PERMANENT,
2910                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2911         if (!IS_ERR(ifp)) {
2912                 spin_lock_bh(&ifp->lock);
2913                 ifp->flags &= ~IFA_F_TENTATIVE;
2914                 spin_unlock_bh(&ifp->lock);
2915                 rt_genid_bump_ipv6(dev_net(idev->dev));
2916                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2917                 in6_ifa_put(ifp);
2918         }
2919 }
2920
2921 #if IS_ENABLED(CONFIG_IPV6_SIT)
2922 static void sit_add_v4_addrs(struct inet6_dev *idev)
2923 {
2924         struct in6_addr addr;
2925         struct net_device *dev;
2926         struct net *net = dev_net(idev->dev);
2927         int scope, plen;
2928         u32 pflags = 0;
2929
2930         ASSERT_RTNL();
2931
2932         memset(&addr, 0, sizeof(struct in6_addr));
2933         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2934
2935         if (idev->dev->flags&IFF_POINTOPOINT) {
2936                 addr.s6_addr32[0] = htonl(0xfe800000);
2937                 scope = IFA_LINK;
2938                 plen = 64;
2939         } else {
2940                 scope = IPV6_ADDR_COMPATv4;
2941                 plen = 96;
2942                 pflags |= RTF_NONEXTHOP;
2943         }
2944
2945         if (addr.s6_addr32[3]) {
2946                 add_addr(idev, &addr, plen, scope);
2947                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2948                 return;
2949         }
2950
2951         for_each_netdev(net, dev) {
2952                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2953                 if (in_dev && (dev->flags & IFF_UP)) {
2954                         struct in_ifaddr *ifa;
2955
2956                         int flag = scope;
2957
2958                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2959
2960                                 addr.s6_addr32[3] = ifa->ifa_local;
2961
2962                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2963                                         continue;
2964                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2965                                         if (idev->dev->flags&IFF_POINTOPOINT)
2966                                                 continue;
2967                                         flag |= IFA_HOST;
2968                                 }
2969
2970                                 add_addr(idev, &addr, plen, flag);
2971                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2972                                                       pflags);
2973                         }
2974                 }
2975         }
2976 }
2977 #endif
2978
2979 static void init_loopback(struct net_device *dev)
2980 {
2981         struct inet6_dev  *idev;
2982         struct net_device *sp_dev;
2983         struct inet6_ifaddr *sp_ifa;
2984         struct rt6_info *sp_rt;
2985
2986         /* ::1 */
2987
2988         ASSERT_RTNL();
2989
2990         idev = ipv6_find_idev(dev);
2991         if (!idev) {
2992                 pr_debug("%s: add_dev failed\n", __func__);
2993                 return;
2994         }
2995
2996         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2997
2998         /* Add routes to other interface's IPv6 addresses */
2999         for_each_netdev(dev_net(dev), sp_dev) {
3000                 if (!strcmp(sp_dev->name, dev->name))
3001                         continue;
3002
3003                 idev = __in6_dev_get(sp_dev);
3004                 if (!idev)
3005                         continue;
3006
3007                 read_lock_bh(&idev->lock);
3008                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3009
3010                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3011                                 continue;
3012
3013                         if (sp_ifa->rt) {
3014                                 /* This dst has been added to garbage list when
3015                                  * lo device down, release this obsolete dst and
3016                                  * reallocate a new router for ifa.
3017                                  */
3018                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3019                                         ip6_rt_put(sp_ifa->rt);
3020                                         sp_ifa->rt = NULL;
3021                                 } else {
3022                                         continue;
3023                                 }
3024                         }
3025
3026                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3027
3028                         /* Failure cases are ignored */
3029                         if (!IS_ERR(sp_rt)) {
3030                                 sp_ifa->rt = sp_rt;
3031                                 ip6_ins_rt(sp_rt);
3032                         }
3033                 }
3034                 read_unlock_bh(&idev->lock);
3035         }
3036 }
3037
3038 void addrconf_add_linklocal(struct inet6_dev *idev,
3039                             const struct in6_addr *addr, u32 flags)
3040 {
3041         struct inet6_ifaddr *ifp;
3042         u32 addr_flags = flags | IFA_F_PERMANENT;
3043
3044 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3045         if (idev->cnf.optimistic_dad &&
3046             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3047                 addr_flags |= IFA_F_OPTIMISTIC;
3048 #endif
3049
3050         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3051                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3052         if (!IS_ERR(ifp)) {
3053                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3054                 addrconf_dad_start(ifp);
3055                 in6_ifa_put(ifp);
3056         }
3057 }
3058 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3059
3060 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3061 {
3062         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3063                 return true;
3064
3065         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3066             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3067                 return true;
3068
3069         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3070             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3071                 return true;
3072
3073         return false;
3074 }
3075
3076 static int ipv6_generate_stable_address(struct in6_addr *address,
3077                                         u8 dad_count,
3078                                         const struct inet6_dev *idev)
3079 {
3080         static DEFINE_SPINLOCK(lock);
3081         static __u32 digest[SHA_DIGEST_WORDS];
3082         static __u32 workspace[SHA_WORKSPACE_WORDS];
3083
3084         static union {
3085                 char __data[SHA_MESSAGE_BYTES];
3086                 struct {
3087                         struct in6_addr secret;
3088                         __be32 prefix[2];
3089                         unsigned char hwaddr[MAX_ADDR_LEN];
3090                         u8 dad_count;
3091                 } __packed;
3092         } data;
3093
3094         struct in6_addr secret;
3095         struct in6_addr temp;
3096         struct net *net = dev_net(idev->dev);
3097
3098         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3099
3100         if (idev->cnf.stable_secret.initialized)
3101                 secret = idev->cnf.stable_secret.secret;
3102         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3103                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3104         else
3105                 return -1;
3106
3107 retry:
3108         spin_lock_bh(&lock);
3109
3110         sha_init(digest);
3111         memset(&data, 0, sizeof(data));
3112         memset(workspace, 0, sizeof(workspace));
3113         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3114         data.prefix[0] = address->s6_addr32[0];
3115         data.prefix[1] = address->s6_addr32[1];
3116         data.secret = secret;
3117         data.dad_count = dad_count;
3118
3119         sha_transform(digest, data.__data, workspace);
3120
3121         temp = *address;
3122         temp.s6_addr32[2] = (__force __be32)digest[0];
3123         temp.s6_addr32[3] = (__force __be32)digest[1];
3124
3125         spin_unlock_bh(&lock);
3126
3127         if (ipv6_reserved_interfaceid(temp)) {
3128                 dad_count++;
3129                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3130                         return -1;
3131                 goto retry;
3132         }
3133
3134         *address = temp;
3135         return 0;
3136 }
3137
3138 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3139 {
3140         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3141
3142         if (s->initialized)
3143                 return;
3144         s = &idev->cnf.stable_secret;
3145         get_random_bytes(&s->secret, sizeof(s->secret));
3146         s->initialized = true;
3147 }
3148
3149 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3150 {
3151         struct in6_addr addr;
3152
3153         /* no link local addresses on L3 master devices */
3154         if (netif_is_l3_master(idev->dev))
3155                 return;
3156
3157         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3158
3159         switch (idev->cnf.addr_gen_mode) {
3160         case IN6_ADDR_GEN_MODE_RANDOM:
3161                 ipv6_gen_mode_random_init(idev);
3162                 /* fallthrough */
3163         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3164                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3165                         addrconf_add_linklocal(idev, &addr,
3166                                                IFA_F_STABLE_PRIVACY);
3167                 else if (prefix_route)
3168                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3169                 break;
3170         case IN6_ADDR_GEN_MODE_EUI64:
3171                 /* addrconf_add_linklocal also adds a prefix_route and we
3172                  * only need to care about prefix routes if ipv6_generate_eui64
3173                  * couldn't generate one.
3174                  */
3175                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3176                         addrconf_add_linklocal(idev, &addr, 0);
3177                 else if (prefix_route)
3178                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3179                 break;
3180         case IN6_ADDR_GEN_MODE_NONE:
3181         default:
3182                 /* will not add any link local address */
3183                 break;
3184         }
3185 }
3186
3187 static void addrconf_dev_config(struct net_device *dev)
3188 {
3189         struct inet6_dev *idev;
3190
3191         ASSERT_RTNL();
3192
3193         if ((dev->type != ARPHRD_ETHER) &&
3194             (dev->type != ARPHRD_FDDI) &&
3195             (dev->type != ARPHRD_ARCNET) &&
3196             (dev->type != ARPHRD_INFINIBAND) &&
3197             (dev->type != ARPHRD_IEEE1394) &&
3198             (dev->type != ARPHRD_TUNNEL6) &&
3199             (dev->type != ARPHRD_6LOWPAN) &&
3200             (dev->type != ARPHRD_IP6GRE) &&
3201             (dev->type != ARPHRD_IPGRE) &&
3202             (dev->type != ARPHRD_TUNNEL) &&
3203             (dev->type != ARPHRD_NONE)) {
3204                 /* Alas, we support only Ethernet autoconfiguration. */
3205                 return;
3206         }
3207
3208         idev = addrconf_add_dev(dev);
3209         if (IS_ERR(idev))
3210                 return;
3211
3212         /* this device type has no EUI support */
3213         if (dev->type == ARPHRD_NONE &&
3214             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3215                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3216
3217         addrconf_addr_gen(idev, false);
3218 }
3219
3220 #if IS_ENABLED(CONFIG_IPV6_SIT)
3221 static void addrconf_sit_config(struct net_device *dev)
3222 {
3223         struct inet6_dev *idev;
3224
3225         ASSERT_RTNL();
3226
3227         /*
3228          * Configure the tunnel with one of our IPv4
3229          * addresses... we should configure all of
3230          * our v4 addrs in the tunnel
3231          */
3232
3233         idev = ipv6_find_idev(dev);
3234         if (!idev) {
3235                 pr_debug("%s: add_dev failed\n", __func__);
3236                 return;
3237         }
3238
3239         if (dev->priv_flags & IFF_ISATAP) {
3240                 addrconf_addr_gen(idev, false);
3241                 return;
3242         }
3243
3244         sit_add_v4_addrs(idev);
3245
3246         if (dev->flags&IFF_POINTOPOINT)
3247                 addrconf_add_mroute(dev);
3248 }
3249 #endif
3250
3251 #if IS_ENABLED(CONFIG_NET_IPGRE)
3252 static void addrconf_gre_config(struct net_device *dev)
3253 {
3254         struct inet6_dev *idev;
3255
3256         ASSERT_RTNL();
3257
3258         idev = ipv6_find_idev(dev);
3259         if (!idev) {
3260                 pr_debug("%s: add_dev failed\n", __func__);
3261                 return;
3262         }
3263
3264         addrconf_addr_gen(idev, true);
3265         if (dev->flags & IFF_POINTOPOINT)
3266                 addrconf_add_mroute(dev);
3267 }
3268 #endif
3269
3270 static int fixup_permanent_addr(struct inet6_dev *idev,
3271                                 struct inet6_ifaddr *ifp)
3272 {
3273         if (!ifp->rt) {
3274                 struct rt6_info *rt;
3275
3276                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3277                 if (unlikely(IS_ERR(rt)))
3278                         return PTR_ERR(rt);
3279
3280                 ifp->rt = rt;
3281         }
3282
3283         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3284                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3285                                       idev->dev, 0, 0);
3286         }
3287
3288         addrconf_dad_start(ifp);
3289
3290         return 0;
3291 }
3292
3293 static void addrconf_permanent_addr(struct net_device *dev)
3294 {
3295         struct inet6_ifaddr *ifp, *tmp;
3296         struct inet6_dev *idev;
3297
3298         idev = __in6_dev_get(dev);
3299         if (!idev)
3300                 return;
3301
3302         write_lock_bh(&idev->lock);
3303
3304         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3305                 if ((ifp->flags & IFA_F_PERMANENT) &&
3306                     fixup_permanent_addr(idev, ifp) < 0) {
3307                         write_unlock_bh(&idev->lock);
3308                         ipv6_del_addr(ifp);
3309                         write_lock_bh(&idev->lock);
3310
3311                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3312                                              idev->dev->name, &ifp->addr);
3313                 }
3314         }
3315
3316         write_unlock_bh(&idev->lock);
3317 }
3318
3319 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3320                            void *ptr)
3321 {
3322         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3323         struct netdev_notifier_changeupper_info *info;
3324         struct inet6_dev *idev = __in6_dev_get(dev);
3325         int run_pending = 0;
3326         int err;
3327
3328         switch (event) {
3329         case NETDEV_REGISTER:
3330                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3331                         idev = ipv6_add_dev(dev);
3332                         if (IS_ERR(idev))
3333                                 return notifier_from_errno(PTR_ERR(idev));
3334                 }
3335                 break;
3336
3337         case NETDEV_CHANGEMTU:
3338                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3339                 if (dev->mtu < IPV6_MIN_MTU) {
3340                         addrconf_ifdown(dev, 1);
3341                         break;
3342                 }
3343
3344                 if (idev) {
3345                         rt6_mtu_change(dev, dev->mtu);
3346                         idev->cnf.mtu6 = dev->mtu;
3347                         break;
3348                 }
3349
3350                 /* allocate new idev */
3351                 idev = ipv6_add_dev(dev);
3352                 if (IS_ERR(idev))
3353                         break;
3354
3355                 /* device is still not ready */
3356                 if (!(idev->if_flags & IF_READY))
3357                         break;
3358
3359                 run_pending = 1;
3360
3361                 /* fall through */
3362
3363         case NETDEV_UP:
3364         case NETDEV_CHANGE:
3365                 if (dev->flags & IFF_SLAVE)
3366                         break;
3367
3368                 if (idev && idev->cnf.disable_ipv6)
3369                         break;
3370
3371                 if (event == NETDEV_UP) {
3372                         /* restore routes for permanent addresses */
3373                         addrconf_permanent_addr(dev);
3374
3375                         if (!addrconf_qdisc_ok(dev)) {
3376                                 /* device is not ready yet. */
3377                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3378                                         dev->name);
3379                                 break;
3380                         }
3381
3382                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3383                                 idev = ipv6_add_dev(dev);
3384
3385                         if (!IS_ERR_OR_NULL(idev)) {
3386                                 idev->if_flags |= IF_READY;
3387                                 run_pending = 1;
3388                         }
3389                 } else if (event == NETDEV_CHANGE) {
3390                         if (!addrconf_qdisc_ok(dev)) {
3391                                 /* device is still not ready. */
3392                                 break;
3393                         }
3394
3395                         if (idev) {
3396                                 if (idev->if_flags & IF_READY) {
3397                                         /* device is already configured -
3398                                          * but resend MLD reports, we might
3399                                          * have roamed and need to update
3400                                          * multicast snooping switches
3401                                          */
3402                                         ipv6_mc_up(idev);
3403                                         break;
3404                                 }
3405                                 idev->if_flags |= IF_READY;
3406                         }
3407
3408                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3409                                 dev->name);
3410
3411                         run_pending = 1;
3412                 }
3413
3414                 switch (dev->type) {
3415 #if IS_ENABLED(CONFIG_IPV6_SIT)
3416                 case ARPHRD_SIT:
3417                         addrconf_sit_config(dev);
3418                         break;
3419 #endif
3420 #if IS_ENABLED(CONFIG_NET_IPGRE)
3421                 case ARPHRD_IPGRE:
3422                         addrconf_gre_config(dev);
3423                         break;
3424 #endif
3425                 case ARPHRD_LOOPBACK:
3426                         init_loopback(dev);
3427                         break;
3428
3429                 default:
3430                         addrconf_dev_config(dev);
3431                         break;
3432                 }
3433
3434                 if (!IS_ERR_OR_NULL(idev)) {
3435                         if (run_pending)
3436                                 addrconf_dad_run(idev);
3437
3438                         /*
3439                          * If the MTU changed during the interface down,
3440                          * when the interface up, the changed MTU must be
3441                          * reflected in the idev as well as routers.
3442                          */
3443                         if (idev->cnf.mtu6 != dev->mtu &&
3444                             dev->mtu >= IPV6_MIN_MTU) {
3445                                 rt6_mtu_change(dev, dev->mtu);
3446                                 idev->cnf.mtu6 = dev->mtu;
3447                         }
3448                         idev->tstamp = jiffies;
3449                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3450
3451                         /*
3452                          * If the changed mtu during down is lower than
3453                          * IPV6_MIN_MTU stop IPv6 on this interface.
3454                          */
3455                         if (dev->mtu < IPV6_MIN_MTU)
3456                                 addrconf_ifdown(dev, 1);
3457                 }
3458                 break;
3459
3460         case NETDEV_DOWN:
3461         case NETDEV_UNREGISTER:
3462                 /*
3463                  *      Remove all addresses from this interface.
3464                  */
3465                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3466                 break;
3467
3468         case NETDEV_CHANGENAME:
3469                 if (idev) {
3470                         snmp6_unregister_dev(idev);
3471                         addrconf_sysctl_unregister(idev);
3472                         err = addrconf_sysctl_register(idev);
3473                         if (err)
3474                                 return notifier_from_errno(err);
3475                         err = snmp6_register_dev(idev);
3476                         if (err) {
3477                                 addrconf_sysctl_unregister(idev);
3478                                 return notifier_from_errno(err);
3479                         }
3480                 }
3481                 break;
3482
3483         case NETDEV_PRE_TYPE_CHANGE:
3484         case NETDEV_POST_TYPE_CHANGE:
3485                 if (idev)
3486                         addrconf_type_change(dev, event);
3487                 break;
3488
3489         case NETDEV_CHANGEUPPER:
3490                 info = ptr;
3491
3492                 /* flush all routes if dev is linked to or unlinked from
3493                  * an L3 master device (e.g., VRF)
3494                  */
3495                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3496                         addrconf_ifdown(dev, 0);
3497         }
3498
3499         return NOTIFY_OK;
3500 }
3501
3502 /*
3503  *      addrconf module should be notified of a device going up
3504  */
3505 static struct notifier_block ipv6_dev_notf = {
3506         .notifier_call = addrconf_notify,
3507 };
3508
3509 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3510 {
3511         struct inet6_dev *idev;
3512         ASSERT_RTNL();
3513
3514         idev = __in6_dev_get(dev);
3515
3516         if (event == NETDEV_POST_TYPE_CHANGE)
3517                 ipv6_mc_remap(idev);
3518         else if (event == NETDEV_PRE_TYPE_CHANGE)
3519                 ipv6_mc_unmap(idev);
3520 }
3521
3522 static bool addr_is_local(const struct in6_addr *addr)
3523 {
3524         return ipv6_addr_type(addr) &
3525                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3526 }
3527
3528 static int addrconf_ifdown(struct net_device *dev, int how)
3529 {
3530         struct net *net = dev_net(dev);
3531         struct inet6_dev *idev;
3532         struct inet6_ifaddr *ifa, *tmp;
3533         struct list_head del_list;
3534         int _keep_addr;
3535         bool keep_addr;
3536         int state, i;
3537
3538         ASSERT_RTNL();
3539
3540         rt6_ifdown(net, dev);
3541         neigh_ifdown(&nd_tbl, dev);
3542
3543         idev = __in6_dev_get(dev);
3544         if (!idev)
3545                 return -ENODEV;
3546
3547         /*
3548          * Step 1: remove reference to ipv6 device from parent device.
3549          *         Do not dev_put!
3550          */
3551         if (how) {
3552                 idev->dead = 1;
3553
3554                 /* protected by rtnl_lock */
3555                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3556
3557                 /* Step 1.5: remove snmp6 entry */
3558                 snmp6_unregister_dev(idev);
3559
3560         }
3561
3562         /* aggregate the system setting and interface setting */
3563         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3564         if (!_keep_addr)
3565                 _keep_addr = idev->cnf.keep_addr_on_down;
3566
3567         /* combine the user config with event to determine if permanent
3568          * addresses are to be removed from address hash table
3569          */
3570         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3571
3572         /* Step 2: clear hash table */
3573         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3574                 struct hlist_head *h = &inet6_addr_lst[i];
3575
3576                 spin_lock_bh(&addrconf_hash_lock);
3577 restart:
3578                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3579                         if (ifa->idev == idev) {
3580                                 addrconf_del_dad_work(ifa);
3581                                 /* combined flag + permanent flag decide if
3582                                  * address is retained on a down event
3583                                  */
3584                                 if (!keep_addr ||
3585                                     !(ifa->flags & IFA_F_PERMANENT) ||
3586                                     addr_is_local(&ifa->addr)) {
3587                                         hlist_del_init_rcu(&ifa->addr_lst);
3588                                         goto restart;
3589                                 }
3590                         }
3591                 }
3592                 spin_unlock_bh(&addrconf_hash_lock);
3593         }
3594
3595         write_lock_bh(&idev->lock);
3596
3597         addrconf_del_rs_timer(idev);
3598
3599         /* Step 2: clear flags for stateless addrconf */
3600         if (!how)
3601                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3602
3603         /* Step 3: clear tempaddr list */
3604         while (!list_empty(&idev->tempaddr_list)) {
3605                 ifa = list_first_entry(&idev->tempaddr_list,
3606                                        struct inet6_ifaddr, tmp_list);
3607                 list_del(&ifa->tmp_list);
3608                 write_unlock_bh(&idev->lock);
3609                 spin_lock_bh(&ifa->lock);
3610
3611                 if (ifa->ifpub) {
3612                         in6_ifa_put(ifa->ifpub);
3613                         ifa->ifpub = NULL;
3614                 }
3615                 spin_unlock_bh(&ifa->lock);
3616                 in6_ifa_put(ifa);
3617                 write_lock_bh(&idev->lock);
3618         }
3619
3620         /* re-combine the user config with event to determine if permanent
3621          * addresses are to be removed from the interface list
3622          */
3623         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3624
3625         INIT_LIST_HEAD(&del_list);
3626         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3627                 struct rt6_info *rt = NULL;
3628
3629                 addrconf_del_dad_work(ifa);
3630
3631                 write_unlock_bh(&idev->lock);
3632                 spin_lock_bh(&ifa->lock);
3633
3634                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3635                     !addr_is_local(&ifa->addr)) {
3636                         /* set state to skip the notifier below */
3637                         state = INET6_IFADDR_STATE_DEAD;
3638                         ifa->state = 0;
3639                         if (!(ifa->flags & IFA_F_NODAD))
3640                                 ifa->flags |= IFA_F_TENTATIVE;
3641
3642                         rt = ifa->rt;
3643                         ifa->rt = NULL;
3644                 } else {
3645                         state = ifa->state;
3646                         ifa->state = INET6_IFADDR_STATE_DEAD;
3647
3648                         list_move(&ifa->if_list, &del_list);
3649                 }
3650
3651                 spin_unlock_bh(&ifa->lock);
3652
3653                 if (rt)
3654                         ip6_del_rt(rt);
3655
3656                 if (state != INET6_IFADDR_STATE_DEAD) {
3657                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3658                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3659                 } else {
3660                         if (idev->cnf.forwarding)
3661                                 addrconf_leave_anycast(ifa);
3662                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3663                 }
3664
3665                 write_lock_bh(&idev->lock);
3666         }
3667
3668         write_unlock_bh(&idev->lock);
3669
3670         /* now clean up addresses to be removed */
3671         while (!list_empty(&del_list)) {
3672                 ifa = list_first_entry(&del_list,
3673                                        struct inet6_ifaddr, if_list);
3674                 list_del(&ifa->if_list);
3675
3676                 in6_ifa_put(ifa);
3677         }
3678
3679         /* Step 5: Discard anycast and multicast list */
3680         if (how) {
3681                 ipv6_ac_destroy_dev(idev);
3682                 ipv6_mc_destroy_dev(idev);
3683         } else {
3684                 ipv6_mc_down(idev);
3685         }
3686
3687         idev->tstamp = jiffies;
3688
3689         /* Last: Shot the device (if unregistered) */
3690         if (how) {
3691                 addrconf_sysctl_unregister(idev);
3692                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3693                 neigh_ifdown(&nd_tbl, dev);
3694                 in6_dev_put(idev);
3695         }
3696         return 0;
3697 }
3698
3699 static void addrconf_rs_timer(unsigned long data)
3700 {
3701         struct inet6_dev *idev = (struct inet6_dev *)data;
3702         struct net_device *dev = idev->dev;
3703         struct in6_addr lladdr;
3704
3705         write_lock(&idev->lock);
3706         if (idev->dead || !(idev->if_flags & IF_READY))
3707                 goto out;
3708
3709         if (!ipv6_accept_ra(idev))
3710                 goto out;
3711
3712         /* Announcement received after solicitation was sent */
3713         if (idev->if_flags & IF_RA_RCVD)
3714                 goto out;
3715
3716         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3717                 write_unlock(&idev->lock);
3718                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3719                         ndisc_send_rs(dev, &lladdr,
3720                                       &in6addr_linklocal_allrouters);
3721                 else
3722                         goto put;
3723
3724                 write_lock(&idev->lock);
3725                 idev->rs_interval = rfc3315_s14_backoff_update(
3726                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3727                 /* The wait after the last probe can be shorter */
3728                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3729                                              idev->cnf.rtr_solicits) ?
3730                                       idev->cnf.rtr_solicit_delay :
3731                                       idev->rs_interval);
3732         } else {
3733                 /*
3734                  * Note: we do not support deprecated "all on-link"
3735                  * assumption any longer.
3736                  */
3737                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3738         }
3739
3740 out:
3741         write_unlock(&idev->lock);
3742 put:
3743         in6_dev_put(idev);
3744 }
3745
3746 /*
3747  *      Duplicate Address Detection
3748  */
3749 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3750 {
3751         unsigned long rand_num;
3752         struct inet6_dev *idev = ifp->idev;
3753         u64 nonce;
3754
3755         if (ifp->flags & IFA_F_OPTIMISTIC)
3756                 rand_num = 0;
3757         else
3758                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3759
3760         nonce = 0;
3761         if (idev->cnf.enhanced_dad ||
3762             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3763                 do
3764                         get_random_bytes(&nonce, 6);
3765                 while (nonce == 0);
3766         }
3767         ifp->dad_nonce = nonce;
3768         ifp->dad_probes = idev->cnf.dad_transmits;
3769         addrconf_mod_dad_work(ifp, rand_num);
3770 }
3771
3772 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3773 {
3774         struct inet6_dev *idev = ifp->idev;
3775         struct net_device *dev = idev->dev;
3776         bool bump_id, notify = false;
3777
3778         addrconf_join_solict(dev, &ifp->addr);
3779
3780         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3781
3782         read_lock_bh(&idev->lock);
3783         spin_lock(&ifp->lock);
3784         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3785                 goto out;
3786
3787         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3788             idev->cnf.accept_dad < 1 ||
3789             !(ifp->flags&IFA_F_TENTATIVE) ||
3790             ifp->flags & IFA_F_NODAD) {
3791                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3792                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3793                 spin_unlock(&ifp->lock);
3794                 read_unlock_bh(&idev->lock);
3795
3796                 addrconf_dad_completed(ifp, bump_id);
3797                 return;
3798         }
3799
3800         if (!(idev->if_flags & IF_READY)) {
3801                 spin_unlock(&ifp->lock);
3802                 read_unlock_bh(&idev->lock);
3803                 /*
3804                  * If the device is not ready:
3805                  * - keep it tentative if it is a permanent address.
3806                  * - otherwise, kill it.
3807                  */
3808                 in6_ifa_hold(ifp);
3809                 addrconf_dad_stop(ifp, 0);
3810                 return;
3811         }
3812
3813         /*
3814          * Optimistic nodes can start receiving
3815          * Frames right away
3816          */
3817         if (ifp->flags & IFA_F_OPTIMISTIC) {
3818                 ip6_ins_rt(ifp->rt);
3819                 if (ipv6_use_optimistic_addr(idev)) {
3820                         /* Because optimistic nodes can use this address,
3821                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3822                          */
3823                         notify = true;
3824                 }
3825         }
3826
3827         addrconf_dad_kick(ifp);
3828 out:
3829         spin_unlock(&ifp->lock);
3830         read_unlock_bh(&idev->lock);
3831         if (notify)
3832                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3833 }
3834
3835 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3836 {
3837         bool begin_dad = false;
3838
3839         spin_lock_bh(&ifp->lock);
3840         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3841                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3842                 begin_dad = true;
3843         }
3844         spin_unlock_bh(&ifp->lock);
3845
3846         if (begin_dad)
3847                 addrconf_mod_dad_work(ifp, 0);
3848 }
3849
3850 static void addrconf_dad_work(struct work_struct *w)
3851 {
3852         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3853                                                 struct inet6_ifaddr,
3854                                                 dad_work);
3855         struct inet6_dev *idev = ifp->idev;
3856         bool bump_id, disable_ipv6 = false;
3857         struct in6_addr mcaddr;
3858
3859         enum {
3860                 DAD_PROCESS,
3861                 DAD_BEGIN,
3862                 DAD_ABORT,
3863         } action = DAD_PROCESS;
3864
3865         rtnl_lock();
3866
3867         spin_lock_bh(&ifp->lock);
3868         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3869                 action = DAD_BEGIN;
3870                 ifp->state = INET6_IFADDR_STATE_DAD;
3871         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3872                 action = DAD_ABORT;
3873                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3874
3875                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3876                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3877                         struct in6_addr addr;
3878
3879                         addr.s6_addr32[0] = htonl(0xfe800000);
3880                         addr.s6_addr32[1] = 0;
3881
3882                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3883                             ipv6_addr_equal(&ifp->addr, &addr)) {
3884                                 /* DAD failed for link-local based on MAC */
3885                                 idev->cnf.disable_ipv6 = 1;
3886
3887                                 pr_info("%s: IPv6 being disabled!\n",
3888                                         ifp->idev->dev->name);
3889                                 disable_ipv6 = true;
3890                         }
3891                 }
3892         }
3893         spin_unlock_bh(&ifp->lock);
3894
3895         if (action == DAD_BEGIN) {
3896                 addrconf_dad_begin(ifp);
3897                 goto out;
3898         } else if (action == DAD_ABORT) {
3899                 in6_ifa_hold(ifp);
3900                 addrconf_dad_stop(ifp, 1);
3901                 if (disable_ipv6)
3902                         addrconf_ifdown(idev->dev, 0);
3903                 goto out;
3904         }
3905
3906         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3907                 goto out;
3908
3909         write_lock_bh(&idev->lock);
3910         if (idev->dead || !(idev->if_flags & IF_READY)) {
3911                 write_unlock_bh(&idev->lock);
3912                 goto out;
3913         }
3914
3915         spin_lock(&ifp->lock);
3916         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3917                 spin_unlock(&ifp->lock);
3918                 write_unlock_bh(&idev->lock);
3919                 goto out;
3920         }
3921
3922         if (ifp->dad_probes == 0) {
3923                 /*
3924                  * DAD was successful
3925                  */
3926
3927                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3928                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3929                 spin_unlock(&ifp->lock);
3930                 write_unlock_bh(&idev->lock);
3931
3932                 addrconf_dad_completed(ifp, bump_id);
3933
3934                 goto out;
3935         }
3936
3937         ifp->dad_probes--;
3938         addrconf_mod_dad_work(ifp,
3939                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3940         spin_unlock(&ifp->lock);
3941         write_unlock_bh(&idev->lock);
3942
3943         /* send a neighbour solicitation for our addr */
3944         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3945         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3946                       ifp->dad_nonce);
3947 out:
3948         in6_ifa_put(ifp);
3949         rtnl_unlock();
3950 }
3951
3952 /* ifp->idev must be at least read locked */
3953 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3954 {
3955         struct inet6_ifaddr *ifpiter;
3956         struct inet6_dev *idev = ifp->idev;
3957
3958         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3959                 if (ifpiter->scope > IFA_LINK)
3960                         break;
3961                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3962                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3963                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3964                     IFA_F_PERMANENT)
3965                         return false;
3966         }
3967         return true;
3968 }
3969
3970 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
3971 {
3972         struct net_device *dev = ifp->idev->dev;
3973         struct in6_addr lladdr;
3974         bool send_rs, send_mld;
3975
3976         addrconf_del_dad_work(ifp);
3977
3978         /*
3979          *      Configure the address for reception. Now it is valid.
3980          */
3981
3982         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3983
3984         /* If added prefix is link local and we are prepared to process
3985            router advertisements, start sending router solicitations.
3986          */
3987
3988         read_lock_bh(&ifp->idev->lock);
3989         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3990         send_rs = send_mld &&
3991                   ipv6_accept_ra(ifp->idev) &&
3992                   ifp->idev->cnf.rtr_solicits != 0 &&
3993                   (dev->flags&IFF_LOOPBACK) == 0;
3994         read_unlock_bh(&ifp->idev->lock);
3995
3996         /* While dad is in progress mld report's source address is in6_addrany.
3997          * Resend with proper ll now.
3998          */
3999         if (send_mld)
4000                 ipv6_mc_dad_complete(ifp->idev);
4001
4002         if (send_rs) {
4003                 /*
4004                  *      If a host as already performed a random delay
4005                  *      [...] as part of DAD [...] there is no need
4006                  *      to delay again before sending the first RS
4007                  */
4008                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4009                         return;
4010                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4011
4012                 write_lock_bh(&ifp->idev->lock);
4013                 spin_lock(&ifp->lock);
4014                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4015                         ifp->idev->cnf.rtr_solicit_interval);
4016                 ifp->idev->rs_probes = 1;
4017                 ifp->idev->if_flags |= IF_RS_SENT;
4018                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4019                 spin_unlock(&ifp->lock);
4020                 write_unlock_bh(&ifp->idev->lock);
4021         }
4022
4023         if (bump_id)
4024                 rt_genid_bump_ipv6(dev_net(dev));
4025
4026         /* Make sure that a new temporary address will be created
4027          * before this temporary address becomes deprecated.
4028          */
4029         if (ifp->flags & IFA_F_TEMPORARY)
4030                 addrconf_verify_rtnl();
4031 }
4032
4033 static void addrconf_dad_run(struct inet6_dev *idev)
4034 {
4035         struct inet6_ifaddr *ifp;
4036
4037         read_lock_bh(&idev->lock);
4038         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4039                 spin_lock(&ifp->lock);
4040                 if (ifp->flags & IFA_F_TENTATIVE &&
4041                     ifp->state == INET6_IFADDR_STATE_DAD)
4042                         addrconf_dad_kick(ifp);
4043                 spin_unlock(&ifp->lock);
4044         }
4045         read_unlock_bh(&idev->lock);
4046 }
4047
4048 #ifdef CONFIG_PROC_FS
4049 struct if6_iter_state {
4050         struct seq_net_private p;
4051         int bucket;
4052         int offset;
4053 };
4054
4055 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4056 {
4057         struct inet6_ifaddr *ifa = NULL;
4058         struct if6_iter_state *state = seq->private;
4059         struct net *net = seq_file_net(seq);
4060         int p = 0;
4061
4062         /* initial bucket if pos is 0 */
4063         if (pos == 0) {
4064                 state->bucket = 0;
4065                 state->offset = 0;
4066         }
4067
4068         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4069                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4070                                          addr_lst) {
4071                         if (!net_eq(dev_net(ifa->idev->dev), net))
4072                                 continue;
4073                         /* sync with offset */
4074                         if (p < state->offset) {
4075                                 p++;
4076                                 continue;
4077                         }
4078                         state->offset++;
4079                         return ifa;
4080                 }
4081
4082                 /* prepare for next bucket */
4083                 state->offset = 0;
4084                 p = 0;
4085         }
4086         return NULL;
4087 }
4088
4089 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4090                                          struct inet6_ifaddr *ifa)
4091 {
4092         struct if6_iter_state *state = seq->private;
4093         struct net *net = seq_file_net(seq);
4094
4095         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4096                 if (!net_eq(dev_net(ifa->idev->dev), net))
4097                         continue;
4098                 state->offset++;
4099                 return ifa;
4100         }
4101
4102         while (++state->bucket < IN6_ADDR_HSIZE) {
4103                 state->offset = 0;
4104                 hlist_for_each_entry_rcu_bh(ifa,
4105                                      &inet6_addr_lst[state->bucket], addr_lst) {
4106                         if (!net_eq(dev_net(ifa->idev->dev), net))
4107                                 continue;
4108                         state->offset++;
4109                         return ifa;
4110                 }
4111         }
4112
4113         return NULL;
4114 }
4115
4116 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4117         __acquires(rcu_bh)
4118 {
4119         rcu_read_lock_bh();
4120         return if6_get_first(seq, *pos);
4121 }
4122
4123 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4124 {
4125         struct inet6_ifaddr *ifa;
4126
4127         ifa = if6_get_next(seq, v);
4128         ++*pos;
4129         return ifa;
4130 }
4131
4132 static void if6_seq_stop(struct seq_file *seq, void *v)
4133         __releases(rcu_bh)
4134 {
4135         rcu_read_unlock_bh();
4136 }
4137
4138 static int if6_seq_show(struct seq_file *seq, void *v)
4139 {
4140         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4141         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4142                    &ifp->addr,
4143                    ifp->idev->dev->ifindex,
4144                    ifp->prefix_len,
4145                    ifp->scope,
4146                    (u8) ifp->flags,
4147                    ifp->idev->dev->name);
4148         return 0;
4149 }
4150
4151 static const struct seq_operations if6_seq_ops = {
4152         .start  = if6_seq_start,
4153         .next   = if6_seq_next,
4154         .show   = if6_seq_show,
4155         .stop   = if6_seq_stop,
4156 };
4157
4158 static int if6_seq_open(struct inode *inode, struct file *file)
4159 {
4160         return seq_open_net(inode, file, &if6_seq_ops,
4161                             sizeof(struct if6_iter_state));
4162 }
4163
4164 static const struct file_operations if6_fops = {
4165         .owner          = THIS_MODULE,
4166         .open           = if6_seq_open,
4167         .read           = seq_read,
4168         .llseek         = seq_lseek,
4169         .release        = seq_release_net,
4170 };
4171
4172 static int __net_init if6_proc_net_init(struct net *net)
4173 {
4174         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4175                 return -ENOMEM;
4176         return 0;
4177 }
4178
4179 static void __net_exit if6_proc_net_exit(struct net *net)
4180 {
4181         remove_proc_entry("if_inet6", net->proc_net);
4182 }
4183
4184 static struct pernet_operations if6_proc_net_ops = {
4185         .init = if6_proc_net_init,
4186         .exit = if6_proc_net_exit,
4187 };
4188
4189 int __init if6_proc_init(void)
4190 {
4191         return register_pernet_subsys(&if6_proc_net_ops);
4192 }
4193
4194 void if6_proc_exit(void)
4195 {
4196         unregister_pernet_subsys(&if6_proc_net_ops);
4197 }
4198 #endif  /* CONFIG_PROC_FS */
4199
4200 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4201 /* Check if address is a home address configured on any interface. */
4202 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4203 {
4204         int ret = 0;
4205         struct inet6_ifaddr *ifp = NULL;
4206         unsigned int hash = inet6_addr_hash(addr);
4207
4208         rcu_read_lock_bh();
4209         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4210                 if (!net_eq(dev_net(ifp->idev->dev), net))
4211                         continue;
4212                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4213                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4214                         ret = 1;
4215                         break;
4216                 }
4217         }
4218         rcu_read_unlock_bh();
4219         return ret;
4220 }
4221 #endif
4222
4223 /*
4224  *      Periodic address status verification
4225  */
4226
4227 static void addrconf_verify_rtnl(void)
4228 {
4229         unsigned long now, next, next_sec, next_sched;
4230         struct inet6_ifaddr *ifp;
4231         int i;
4232
4233         ASSERT_RTNL();
4234
4235         rcu_read_lock_bh();
4236         now = jiffies;
4237         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4238
4239         cancel_delayed_work(&addr_chk_work);
4240
4241         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4242 restart:
4243                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4244                         unsigned long age;
4245
4246                         /* When setting preferred_lft to a value not zero or
4247                          * infinity, while valid_lft is infinity
4248                          * IFA_F_PERMANENT has a non-infinity life time.
4249                          */
4250                         if ((ifp->flags & IFA_F_PERMANENT) &&
4251                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4252                                 continue;
4253
4254                         spin_lock(&ifp->lock);
4255                         /* We try to batch several events at once. */
4256                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4257
4258                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4259                             age >= ifp->valid_lft) {
4260                                 spin_unlock(&ifp->lock);
4261                                 in6_ifa_hold(ifp);
4262                                 ipv6_del_addr(ifp);
4263                                 goto restart;
4264                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4265                                 spin_unlock(&ifp->lock);
4266                                 continue;
4267                         } else if (age >= ifp->prefered_lft) {
4268                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4269                                 int deprecate = 0;
4270
4271                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4272                                         deprecate = 1;
4273                                         ifp->flags |= IFA_F_DEPRECATED;
4274                                 }
4275
4276                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4277                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4278                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4279
4280                                 spin_unlock(&ifp->lock);
4281
4282                                 if (deprecate) {
4283                                         in6_ifa_hold(ifp);
4284
4285                                         ipv6_ifa_notify(0, ifp);
4286                                         in6_ifa_put(ifp);
4287                                         goto restart;
4288                                 }
4289                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4290                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4291                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4292                                         ifp->idev->cnf.dad_transmits *
4293                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4294
4295                                 if (age >= ifp->prefered_lft - regen_advance) {
4296                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4297                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4298                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4299                                         if (!ifp->regen_count && ifpub) {
4300                                                 ifp->regen_count++;
4301                                                 in6_ifa_hold(ifp);
4302                                                 in6_ifa_hold(ifpub);
4303                                                 spin_unlock(&ifp->lock);
4304
4305                                                 spin_lock(&ifpub->lock);
4306                                                 ifpub->regen_count = 0;
4307                                                 spin_unlock(&ifpub->lock);
4308                                                 ipv6_create_tempaddr(ifpub, ifp);
4309                                                 in6_ifa_put(ifpub);
4310                                                 in6_ifa_put(ifp);
4311                                                 goto restart;
4312                                         }
4313                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4314                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4315                                 spin_unlock(&ifp->lock);
4316                         } else {
4317                                 /* ifp->prefered_lft <= ifp->valid_lft */
4318                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4319                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4320                                 spin_unlock(&ifp->lock);
4321                         }
4322                 }
4323         }
4324
4325         next_sec = round_jiffies_up(next);
4326         next_sched = next;
4327
4328         /* If rounded timeout is accurate enough, accept it. */
4329         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4330                 next_sched = next_sec;
4331
4332         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4333         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4334                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4335
4336         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4337               now, next, next_sec, next_sched);
4338         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4339         rcu_read_unlock_bh();
4340 }
4341
4342 static void addrconf_verify_work(struct work_struct *w)
4343 {
4344         rtnl_lock();
4345         addrconf_verify_rtnl();
4346         rtnl_unlock();
4347 }
4348
4349 static void addrconf_verify(void)
4350 {
4351         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4352 }
4353
4354 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4355                                      struct in6_addr **peer_pfx)
4356 {
4357         struct in6_addr *pfx = NULL;
4358
4359         *peer_pfx = NULL;
4360
4361         if (addr)
4362                 pfx = nla_data(addr);
4363
4364         if (local) {
4365                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4366                         *peer_pfx = pfx;
4367                 pfx = nla_data(local);
4368         }
4369
4370         return pfx;
4371 }
4372
4373 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4374         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4375         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4376         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4377         [IFA_FLAGS]             = { .len = sizeof(u32) },
4378 };
4379
4380 static int
4381 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4382 {
4383         struct net *net = sock_net(skb->sk);
4384         struct ifaddrmsg *ifm;
4385         struct nlattr *tb[IFA_MAX+1];
4386         struct in6_addr *pfx, *peer_pfx;
4387         u32 ifa_flags;
4388         int err;
4389
4390         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4391         if (err < 0)
4392                 return err;
4393
4394         ifm = nlmsg_data(nlh);
4395         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4396         if (!pfx)
4397                 return -EINVAL;
4398
4399         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4400
4401         /* We ignore other flags so far. */
4402         ifa_flags &= IFA_F_MANAGETEMPADDR;
4403
4404         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4405                               ifm->ifa_prefixlen);
4406 }
4407
4408 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4409                              u32 prefered_lft, u32 valid_lft)
4410 {
4411         u32 flags;
4412         clock_t expires;
4413         unsigned long timeout;
4414         bool was_managetempaddr;
4415         bool had_prefixroute;
4416
4417         ASSERT_RTNL();
4418
4419         if (!valid_lft || (prefered_lft > valid_lft))
4420                 return -EINVAL;
4421
4422         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4423             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4424                 return -EINVAL;
4425
4426         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4427         if (addrconf_finite_timeout(timeout)) {
4428                 expires = jiffies_to_clock_t(timeout * HZ);
4429                 valid_lft = timeout;
4430                 flags = RTF_EXPIRES;
4431         } else {
4432                 expires = 0;
4433                 flags = 0;
4434                 ifa_flags |= IFA_F_PERMANENT;
4435         }
4436
4437         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4438         if (addrconf_finite_timeout(timeout)) {
4439                 if (timeout == 0)
4440                         ifa_flags |= IFA_F_DEPRECATED;
4441                 prefered_lft = timeout;
4442         }
4443
4444         spin_lock_bh(&ifp->lock);
4445         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4446         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4447                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4448         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4449                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4450                         IFA_F_NOPREFIXROUTE);
4451         ifp->flags |= ifa_flags;
4452         ifp->tstamp = jiffies;
4453         ifp->valid_lft = valid_lft;
4454         ifp->prefered_lft = prefered_lft;
4455
4456         spin_unlock_bh(&ifp->lock);
4457         if (!(ifp->flags&IFA_F_TENTATIVE))
4458                 ipv6_ifa_notify(0, ifp);
4459
4460         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4461                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4462                                       expires, flags);
4463         } else if (had_prefixroute) {
4464                 enum cleanup_prefix_rt_t action;
4465                 unsigned long rt_expires;
4466
4467                 write_lock_bh(&ifp->idev->lock);
4468                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4469                 write_unlock_bh(&ifp->idev->lock);
4470
4471                 if (action != CLEANUP_PREFIX_RT_NOP) {
4472                         cleanup_prefix_route(ifp, rt_expires,
4473                                 action == CLEANUP_PREFIX_RT_DEL);
4474                 }
4475         }
4476
4477         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4478                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4479                         valid_lft = prefered_lft = 0;
4480                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4481                                  !was_managetempaddr, jiffies);
4482         }
4483
4484         addrconf_verify_rtnl();
4485
4486         return 0;
4487 }
4488
4489 static int
4490 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4491 {
4492         struct net *net = sock_net(skb->sk);
4493         struct ifaddrmsg *ifm;
4494         struct nlattr *tb[IFA_MAX+1];
4495         struct in6_addr *pfx, *peer_pfx;
4496         struct inet6_ifaddr *ifa;
4497         struct net_device *dev;
4498         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4499         u32 ifa_flags;
4500         int err;
4501
4502         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4503         if (err < 0)
4504                 return err;
4505
4506         ifm = nlmsg_data(nlh);
4507         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4508         if (!pfx)
4509                 return -EINVAL;
4510
4511         if (tb[IFA_CACHEINFO]) {
4512                 struct ifa_cacheinfo *ci;
4513
4514                 ci = nla_data(tb[IFA_CACHEINFO]);
4515                 valid_lft = ci->ifa_valid;
4516                 preferred_lft = ci->ifa_prefered;
4517         } else {
4518                 preferred_lft = INFINITY_LIFE_TIME;
4519                 valid_lft = INFINITY_LIFE_TIME;
4520         }
4521
4522         dev =  __dev_get_by_index(net, ifm->ifa_index);
4523         if (!dev)
4524                 return -ENODEV;
4525
4526         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4527
4528         /* We ignore other flags so far. */
4529         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4530                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4531
4532         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4533         if (!ifa) {
4534                 /*
4535                  * It would be best to check for !NLM_F_CREATE here but
4536                  * userspace already relies on not having to provide this.
4537                  */
4538                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4539                                       ifm->ifa_prefixlen, ifa_flags,
4540                                       preferred_lft, valid_lft);
4541         }
4542
4543         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4544             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4545                 err = -EEXIST;
4546         else
4547                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4548
4549         in6_ifa_put(ifa);
4550
4551         return err;
4552 }
4553
4554 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4555                           u8 scope, int ifindex)
4556 {
4557         struct ifaddrmsg *ifm;
4558
4559         ifm = nlmsg_data(nlh);
4560         ifm->ifa_family = AF_INET6;
4561         ifm->ifa_prefixlen = prefixlen;
4562         ifm->ifa_flags = flags;
4563         ifm->ifa_scope = scope;
4564         ifm->ifa_index = ifindex;
4565 }
4566
4567 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4568                          unsigned long tstamp, u32 preferred, u32 valid)
4569 {
4570         struct ifa_cacheinfo ci;
4571
4572         ci.cstamp = cstamp_delta(cstamp);
4573         ci.tstamp = cstamp_delta(tstamp);
4574         ci.ifa_prefered = preferred;
4575         ci.ifa_valid = valid;
4576
4577         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4578 }
4579
4580 static inline int rt_scope(int ifa_scope)
4581 {
4582         if (ifa_scope & IFA_HOST)
4583                 return RT_SCOPE_HOST;
4584         else if (ifa_scope & IFA_LINK)
4585                 return RT_SCOPE_LINK;
4586         else if (ifa_scope & IFA_SITE)
4587                 return RT_SCOPE_SITE;
4588         else
4589                 return RT_SCOPE_UNIVERSE;
4590 }
4591
4592 static inline int inet6_ifaddr_msgsize(void)
4593 {
4594         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4595                + nla_total_size(16) /* IFA_LOCAL */
4596                + nla_total_size(16) /* IFA_ADDRESS */
4597                + nla_total_size(sizeof(struct ifa_cacheinfo))
4598                + nla_total_size(4)  /* IFA_FLAGS */;
4599 }
4600
4601 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4602                              u32 portid, u32 seq, int event, unsigned int flags)
4603 {
4604         struct nlmsghdr  *nlh;
4605         u32 preferred, valid;
4606
4607         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4608         if (!nlh)
4609                 return -EMSGSIZE;
4610
4611         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4612                       ifa->idev->dev->ifindex);
4613
4614         if (!((ifa->flags&IFA_F_PERMANENT) &&
4615               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4616                 preferred = ifa->prefered_lft;
4617                 valid = ifa->valid_lft;
4618                 if (preferred != INFINITY_LIFE_TIME) {
4619                         long tval = (jiffies - ifa->tstamp)/HZ;
4620                         if (preferred > tval)
4621                                 preferred -= tval;
4622                         else
4623                                 preferred = 0;
4624                         if (valid != INFINITY_LIFE_TIME) {
4625                                 if (valid > tval)
4626                                         valid -= tval;
4627                                 else
4628                                         valid = 0;
4629                         }
4630                 }
4631         } else {
4632                 preferred = INFINITY_LIFE_TIME;
4633                 valid = INFINITY_LIFE_TIME;
4634         }
4635
4636         if (!ipv6_addr_any(&ifa->peer_addr)) {
4637                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4638                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4639                         goto error;
4640         } else
4641                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4642                         goto error;
4643
4644         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4645                 goto error;
4646
4647         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4648                 goto error;
4649
4650         nlmsg_end(skb, nlh);
4651         return 0;
4652
4653 error:
4654         nlmsg_cancel(skb, nlh);
4655         return -EMSGSIZE;
4656 }
4657
4658 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4659                                 u32 portid, u32 seq, int event, u16 flags)
4660 {
4661         struct nlmsghdr  *nlh;
4662         u8 scope = RT_SCOPE_UNIVERSE;
4663         int ifindex = ifmca->idev->dev->ifindex;
4664
4665         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4666                 scope = RT_SCOPE_SITE;
4667
4668         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4669         if (!nlh)
4670                 return -EMSGSIZE;
4671
4672         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4673         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4674             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4675                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4676                 nlmsg_cancel(skb, nlh);
4677                 return -EMSGSIZE;
4678         }
4679
4680         nlmsg_end(skb, nlh);
4681         return 0;
4682 }
4683
4684 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4685                                 u32 portid, u32 seq, int event, unsigned int flags)
4686 {
4687         struct nlmsghdr  *nlh;
4688         u8 scope = RT_SCOPE_UNIVERSE;
4689         int ifindex = ifaca->aca_idev->dev->ifindex;
4690
4691         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4692                 scope = RT_SCOPE_SITE;
4693
4694         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4695         if (!nlh)
4696                 return -EMSGSIZE;
4697
4698         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4699         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4700             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4701                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4702                 nlmsg_cancel(skb, nlh);
4703                 return -EMSGSIZE;
4704         }
4705
4706         nlmsg_end(skb, nlh);
4707         return 0;
4708 }
4709
4710 enum addr_type_t {
4711         UNICAST_ADDR,
4712         MULTICAST_ADDR,
4713         ANYCAST_ADDR,
4714 };
4715
4716 /* called with rcu_read_lock() */
4717 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4718                           struct netlink_callback *cb, enum addr_type_t type,
4719                           int s_ip_idx, int *p_ip_idx)
4720 {
4721         struct ifmcaddr6 *ifmca;
4722         struct ifacaddr6 *ifaca;
4723         int err = 1;
4724         int ip_idx = *p_ip_idx;
4725
4726         read_lock_bh(&idev->lock);
4727         switch (type) {
4728         case UNICAST_ADDR: {
4729                 struct inet6_ifaddr *ifa;
4730
4731                 /* unicast address incl. temp addr */
4732                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4733                         if (++ip_idx < s_ip_idx)
4734                                 continue;
4735                         err = inet6_fill_ifaddr(skb, ifa,
4736                                                 NETLINK_CB(cb->skb).portid,
4737                                                 cb->nlh->nlmsg_seq,
4738                                                 RTM_NEWADDR,
4739                                                 NLM_F_MULTI);
4740                         if (err < 0)
4741                                 break;
4742                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4743                 }
4744                 break;
4745         }
4746         case MULTICAST_ADDR:
4747                 /* multicast address */
4748                 for (ifmca = idev->mc_list; ifmca;
4749                      ifmca = ifmca->next, ip_idx++) {
4750                         if (ip_idx < s_ip_idx)
4751                                 continue;
4752                         err = inet6_fill_ifmcaddr(skb, ifmca,
4753                                                   NETLINK_CB(cb->skb).portid,
4754                                                   cb->nlh->nlmsg_seq,
4755                                                   RTM_GETMULTICAST,
4756                                                   NLM_F_MULTI);
4757                         if (err < 0)
4758                                 break;
4759                 }
4760                 break;
4761         case ANYCAST_ADDR:
4762                 /* anycast address */
4763                 for (ifaca = idev->ac_list; ifaca;
4764                      ifaca = ifaca->aca_next, ip_idx++) {
4765                         if (ip_idx < s_ip_idx)
4766                                 continue;
4767                         err = inet6_fill_ifacaddr(skb, ifaca,
4768                                                   NETLINK_CB(cb->skb).portid,
4769                                                   cb->nlh->nlmsg_seq,
4770                                                   RTM_GETANYCAST,
4771                                                   NLM_F_MULTI);
4772                         if (err < 0)
4773                                 break;
4774                 }
4775                 break;
4776         default:
4777                 break;
4778         }
4779         read_unlock_bh(&idev->lock);
4780         *p_ip_idx = ip_idx;
4781         return err;
4782 }
4783
4784 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4785                            enum addr_type_t type)
4786 {
4787         struct net *net = sock_net(skb->sk);
4788         int h, s_h;
4789         int idx, ip_idx;
4790         int s_idx, s_ip_idx;
4791         struct net_device *dev;
4792         struct inet6_dev *idev;
4793         struct hlist_head *head;
4794
4795         s_h = cb->args[0];
4796         s_idx = idx = cb->args[1];
4797         s_ip_idx = ip_idx = cb->args[2];
4798
4799         rcu_read_lock();
4800         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4801         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4802                 idx = 0;
4803                 head = &net->dev_index_head[h];
4804                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4805                         if (idx < s_idx)
4806                                 goto cont;
4807                         if (h > s_h || idx > s_idx)
4808                                 s_ip_idx = 0;
4809                         ip_idx = 0;
4810                         idev = __in6_dev_get(dev);
4811                         if (!idev)
4812                                 goto cont;
4813
4814                         if (in6_dump_addrs(idev, skb, cb, type,
4815                                            s_ip_idx, &ip_idx) < 0)
4816                                 goto done;
4817 cont:
4818                         idx++;
4819                 }
4820         }
4821 done:
4822         rcu_read_unlock();
4823         cb->args[0] = h;
4824         cb->args[1] = idx;
4825         cb->args[2] = ip_idx;
4826
4827         return skb->len;
4828 }
4829
4830 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4831 {
4832         enum addr_type_t type = UNICAST_ADDR;
4833
4834         return inet6_dump_addr(skb, cb, type);
4835 }
4836
4837 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4838 {
4839         enum addr_type_t type = MULTICAST_ADDR;
4840
4841         return inet6_dump_addr(skb, cb, type);
4842 }
4843
4844
4845 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4846 {
4847         enum addr_type_t type = ANYCAST_ADDR;
4848
4849         return inet6_dump_addr(skb, cb, type);
4850 }
4851
4852 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4853 {
4854         struct net *net = sock_net(in_skb->sk);
4855         struct ifaddrmsg *ifm;
4856         struct nlattr *tb[IFA_MAX+1];
4857         struct in6_addr *addr = NULL, *peer;
4858         struct net_device *dev = NULL;
4859         struct inet6_ifaddr *ifa;
4860         struct sk_buff *skb;
4861         int err;
4862
4863         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4864         if (err < 0)
4865                 goto errout;
4866
4867         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4868         if (!addr) {
4869                 err = -EINVAL;
4870                 goto errout;
4871         }
4872
4873         ifm = nlmsg_data(nlh);
4874         if (ifm->ifa_index)
4875                 dev = __dev_get_by_index(net, ifm->ifa_index);
4876
4877         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4878         if (!ifa) {
4879                 err = -EADDRNOTAVAIL;
4880                 goto errout;
4881         }
4882
4883         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4884         if (!skb) {
4885                 err = -ENOBUFS;
4886                 goto errout_ifa;
4887         }
4888
4889         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4890                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4891         if (err < 0) {
4892                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4893                 WARN_ON(err == -EMSGSIZE);
4894                 kfree_skb(skb);
4895                 goto errout_ifa;
4896         }
4897         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4898 errout_ifa:
4899         in6_ifa_put(ifa);
4900 errout:
4901         return err;
4902 }
4903
4904 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4905 {
4906         struct sk_buff *skb;
4907         struct net *net = dev_net(ifa->idev->dev);
4908         int err = -ENOBUFS;
4909
4910         /* Don't send DELADDR notification for TENTATIVE address,
4911          * since NEWADDR notification is sent only after removing
4912          * TENTATIVE flag.
4913          */
4914         if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4915                 return;
4916
4917         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4918         if (!skb)
4919                 goto errout;
4920
4921         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4922         if (err < 0) {
4923                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4924                 WARN_ON(err == -EMSGSIZE);
4925                 kfree_skb(skb);
4926                 goto errout;
4927         }
4928         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4929         return;
4930 errout:
4931         if (err < 0)
4932                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4933 }
4934
4935 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4936                                 __s32 *array, int bytes)
4937 {
4938         BUG_ON(bytes < (DEVCONF_MAX * 4));
4939
4940         memset(array, 0, bytes);
4941         array[DEVCONF_FORWARDING] = cnf->forwarding;
4942         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4943         array[DEVCONF_MTU6] = cnf->mtu6;
4944         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4945         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4946         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4947         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4948         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4949         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4950                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4951         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4952                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4953         array[DEVCONF_RTR_SOLICIT_DELAY] =
4954                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4955         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4956         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4957                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4958         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4959                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4960         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4961         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4962         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4963         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4964         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4965         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4966         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4967         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4968         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4969 #ifdef CONFIG_IPV6_ROUTER_PREF
4970         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4971         array[DEVCONF_RTR_PROBE_INTERVAL] =
4972                 jiffies_to_msecs(cnf->rtr_probe_interval);
4973 #ifdef CONFIG_IPV6_ROUTE_INFO
4974         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4975 #endif
4976 #endif
4977         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4978         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4979 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4980         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4981         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4982 #endif
4983 #ifdef CONFIG_IPV6_MROUTE
4984         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4985 #endif
4986         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4987         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4988         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4989         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4990         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4991         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4992         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4993         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4994         /* we omit DEVCONF_STABLE_SECRET for now */
4995         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4996         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4997         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4998         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4999         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5000 #ifdef CONFIG_IPV6_SEG6_HMAC
5001         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5002 #endif
5003         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5004         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5005 }
5006
5007 static inline size_t inet6_ifla6_size(void)
5008 {
5009         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5010              + nla_total_size(sizeof(struct ifla_cacheinfo))
5011              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5012              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5013              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5014              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5015 }
5016
5017 static inline size_t inet6_if_nlmsg_size(void)
5018 {
5019         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5020                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5021                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5022                + nla_total_size(4) /* IFLA_MTU */
5023                + nla_total_size(4) /* IFLA_LINK */
5024                + nla_total_size(1) /* IFLA_OPERSTATE */
5025                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5026 }
5027
5028 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5029                                         int bytes)
5030 {
5031         int i;
5032         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5033         BUG_ON(pad < 0);
5034
5035         /* Use put_unaligned() because stats may not be aligned for u64. */
5036         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5037         for (i = 1; i < ICMP6_MIB_MAX; i++)
5038                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5039
5040         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5041 }
5042
5043 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5044                                         int bytes, size_t syncpoff)
5045 {
5046         int i, c;
5047         u64 buff[IPSTATS_MIB_MAX];
5048         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5049
5050         BUG_ON(pad < 0);
5051
5052         memset(buff, 0, sizeof(buff));
5053         buff[0] = IPSTATS_MIB_MAX;
5054
5055         for_each_possible_cpu(c) {
5056                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5057                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5058         }
5059
5060         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5061         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5062 }
5063
5064 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5065                              int bytes)
5066 {
5067         switch (attrtype) {
5068         case IFLA_INET6_STATS:
5069                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5070                                      offsetof(struct ipstats_mib, syncp));
5071                 break;
5072         case IFLA_INET6_ICMP6STATS:
5073                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5074                 break;
5075         }
5076 }
5077
5078 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5079                                   u32 ext_filter_mask)
5080 {
5081         struct nlattr *nla;
5082         struct ifla_cacheinfo ci;
5083
5084         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5085                 goto nla_put_failure;
5086         ci.max_reasm_len = IPV6_MAXPLEN;
5087         ci.tstamp = cstamp_delta(idev->tstamp);
5088         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5089         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5090         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5091                 goto nla_put_failure;
5092         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5093         if (!nla)
5094                 goto nla_put_failure;
5095         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5096
5097         /* XXX - MC not implemented */
5098
5099         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5100                 return 0;
5101
5102         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5103         if (!nla)
5104                 goto nla_put_failure;
5105         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5106
5107         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5108         if (!nla)
5109                 goto nla_put_failure;
5110         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5111
5112         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5113         if (!nla)
5114                 goto nla_put_failure;
5115
5116         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5117                 goto nla_put_failure;
5118
5119         read_lock_bh(&idev->lock);
5120         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5121         read_unlock_bh(&idev->lock);
5122
5123         return 0;
5124
5125 nla_put_failure:
5126         return -EMSGSIZE;
5127 }
5128
5129 static size_t inet6_get_link_af_size(const struct net_device *dev,
5130                                      u32 ext_filter_mask)
5131 {
5132         if (!__in6_dev_get(dev))
5133                 return 0;
5134
5135         return inet6_ifla6_size();
5136 }
5137
5138 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5139                               u32 ext_filter_mask)
5140 {
5141         struct inet6_dev *idev = __in6_dev_get(dev);
5142
5143         if (!idev)
5144                 return -ENODATA;
5145
5146         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5147                 return -EMSGSIZE;
5148
5149         return 0;
5150 }
5151
5152 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5153 {
5154         struct inet6_ifaddr *ifp;
5155         struct net_device *dev = idev->dev;
5156         bool clear_token, update_rs = false;
5157         struct in6_addr ll_addr;
5158
5159         ASSERT_RTNL();
5160
5161         if (!token)
5162                 return -EINVAL;
5163         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5164                 return -EINVAL;
5165         if (!ipv6_accept_ra(idev))
5166                 return -EINVAL;
5167         if (idev->cnf.rtr_solicits == 0)
5168                 return -EINVAL;
5169
5170         write_lock_bh(&idev->lock);
5171
5172         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5173         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5174
5175         write_unlock_bh(&idev->lock);
5176
5177         clear_token = ipv6_addr_any(token);
5178         if (clear_token)
5179                 goto update_lft;
5180
5181         if (!idev->dead && (idev->if_flags & IF_READY) &&
5182             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5183                              IFA_F_OPTIMISTIC)) {
5184                 /* If we're not ready, then normal ifup will take care
5185                  * of this. Otherwise, we need to request our rs here.
5186                  */
5187                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5188                 update_rs = true;
5189         }
5190
5191 update_lft:
5192         write_lock_bh(&idev->lock);
5193
5194         if (update_rs) {
5195                 idev->if_flags |= IF_RS_SENT;
5196                 idev->rs_interval = rfc3315_s14_backoff_init(
5197                         idev->cnf.rtr_solicit_interval);
5198                 idev->rs_probes = 1;
5199                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5200         }
5201
5202         /* Well, that's kinda nasty ... */
5203         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5204                 spin_lock(&ifp->lock);
5205                 if (ifp->tokenized) {
5206                         ifp->valid_lft = 0;
5207                         ifp->prefered_lft = 0;
5208                 }
5209                 spin_unlock(&ifp->lock);
5210         }
5211
5212         write_unlock_bh(&idev->lock);
5213         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5214         addrconf_verify_rtnl();
5215         return 0;
5216 }
5217
5218 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5219         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5220         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5221 };
5222
5223 static int inet6_validate_link_af(const struct net_device *dev,
5224                                   const struct nlattr *nla)
5225 {
5226         struct nlattr *tb[IFLA_INET6_MAX + 1];
5227
5228         if (dev && !__in6_dev_get(dev))
5229                 return -EAFNOSUPPORT;
5230
5231         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5232 }
5233
5234 static int check_addr_gen_mode(int mode)
5235 {
5236         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5237             mode != IN6_ADDR_GEN_MODE_NONE &&
5238             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5239             mode != IN6_ADDR_GEN_MODE_RANDOM)
5240                 return -EINVAL;
5241         return 1;
5242 }
5243
5244 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5245                                 int mode)
5246 {
5247         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5248             !idev->cnf.stable_secret.initialized &&
5249             !net->ipv6.devconf_dflt->stable_secret.initialized)
5250                 return -EINVAL;
5251         return 1;
5252 }
5253
5254 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5255 {
5256         int err = -EINVAL;
5257         struct inet6_dev *idev = __in6_dev_get(dev);
5258         struct nlattr *tb[IFLA_INET6_MAX + 1];
5259
5260         if (!idev)
5261                 return -EAFNOSUPPORT;
5262
5263         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5264                 BUG();
5265
5266         if (tb[IFLA_INET6_TOKEN]) {
5267                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5268                 if (err)
5269                         return err;
5270         }
5271
5272         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5273                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5274
5275                 if (check_addr_gen_mode(mode) < 0 ||
5276                     check_stable_privacy(idev, dev_net(dev), mode) < 0)
5277                         return -EINVAL;
5278
5279                 idev->cnf.addr_gen_mode = mode;
5280                 err = 0;
5281         }
5282
5283         return err;
5284 }
5285
5286 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5287                              u32 portid, u32 seq, int event, unsigned int flags)
5288 {
5289         struct net_device *dev = idev->dev;
5290         struct ifinfomsg *hdr;
5291         struct nlmsghdr *nlh;
5292         void *protoinfo;
5293
5294         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5295         if (!nlh)
5296                 return -EMSGSIZE;
5297
5298         hdr = nlmsg_data(nlh);
5299         hdr->ifi_family = AF_INET6;
5300         hdr->__ifi_pad = 0;
5301         hdr->ifi_type = dev->type;
5302         hdr->ifi_index = dev->ifindex;
5303         hdr->ifi_flags = dev_get_flags(dev);
5304         hdr->ifi_change = 0;
5305
5306         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5307             (dev->addr_len &&
5308              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5309             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5310             (dev->ifindex != dev_get_iflink(dev) &&
5311              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5312             nla_put_u8(skb, IFLA_OPERSTATE,
5313                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5314                 goto nla_put_failure;
5315         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5316         if (!protoinfo)
5317                 goto nla_put_failure;
5318
5319         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5320                 goto nla_put_failure;
5321
5322         nla_nest_end(skb, protoinfo);
5323         nlmsg_end(skb, nlh);
5324         return 0;
5325
5326 nla_put_failure:
5327         nlmsg_cancel(skb, nlh);
5328         return -EMSGSIZE;
5329 }
5330
5331 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5332 {
5333         struct net *net = sock_net(skb->sk);
5334         int h, s_h;
5335         int idx = 0, s_idx;
5336         struct net_device *dev;
5337         struct inet6_dev *idev;
5338         struct hlist_head *head;
5339
5340         s_h = cb->args[0];
5341         s_idx = cb->args[1];
5342
5343         rcu_read_lock();
5344         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5345                 idx = 0;
5346                 head = &net->dev_index_head[h];
5347                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5348                         if (idx < s_idx)
5349                                 goto cont;
5350                         idev = __in6_dev_get(dev);
5351                         if (!idev)
5352                                 goto cont;
5353                         if (inet6_fill_ifinfo(skb, idev,
5354                                               NETLINK_CB(cb->skb).portid,
5355                                               cb->nlh->nlmsg_seq,
5356                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5357                                 goto out;
5358 cont:
5359                         idx++;
5360                 }
5361         }
5362 out:
5363         rcu_read_unlock();
5364         cb->args[1] = idx;
5365         cb->args[0] = h;
5366
5367         return skb->len;
5368 }
5369
5370 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5371 {
5372         struct sk_buff *skb;
5373         struct net *net = dev_net(idev->dev);
5374         int err = -ENOBUFS;
5375
5376         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5377         if (!skb)
5378                 goto errout;
5379
5380         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5381         if (err < 0) {
5382                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5383                 WARN_ON(err == -EMSGSIZE);
5384                 kfree_skb(skb);
5385                 goto errout;
5386         }
5387         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5388         return;
5389 errout:
5390         if (err < 0)
5391                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5392 }
5393
5394 static inline size_t inet6_prefix_nlmsg_size(void)
5395 {
5396         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5397                + nla_total_size(sizeof(struct in6_addr))
5398                + nla_total_size(sizeof(struct prefix_cacheinfo));
5399 }
5400
5401 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5402                              struct prefix_info *pinfo, u32 portid, u32 seq,
5403                              int event, unsigned int flags)
5404 {
5405         struct prefixmsg *pmsg;
5406         struct nlmsghdr *nlh;
5407         struct prefix_cacheinfo ci;
5408
5409         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5410         if (!nlh)
5411                 return -EMSGSIZE;
5412
5413         pmsg = nlmsg_data(nlh);
5414         pmsg->prefix_family = AF_INET6;
5415         pmsg->prefix_pad1 = 0;
5416         pmsg->prefix_pad2 = 0;
5417         pmsg->prefix_ifindex = idev->dev->ifindex;
5418         pmsg->prefix_len = pinfo->prefix_len;
5419         pmsg->prefix_type = pinfo->type;
5420         pmsg->prefix_pad3 = 0;
5421         pmsg->prefix_flags = 0;
5422         if (pinfo->onlink)
5423                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5424         if (pinfo->autoconf)
5425                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5426
5427         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5428                 goto nla_put_failure;
5429         ci.preferred_time = ntohl(pinfo->prefered);
5430         ci.valid_time = ntohl(pinfo->valid);
5431         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5432                 goto nla_put_failure;
5433         nlmsg_end(skb, nlh);
5434         return 0;
5435
5436 nla_put_failure:
5437         nlmsg_cancel(skb, nlh);
5438         return -EMSGSIZE;
5439 }
5440
5441 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5442                          struct prefix_info *pinfo)
5443 {
5444         struct sk_buff *skb;
5445         struct net *net = dev_net(idev->dev);
5446         int err = -ENOBUFS;
5447
5448         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5449         if (!skb)
5450                 goto errout;
5451
5452         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5453         if (err < 0) {
5454                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5455                 WARN_ON(err == -EMSGSIZE);
5456                 kfree_skb(skb);
5457                 goto errout;
5458         }
5459         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5460         return;
5461 errout:
5462         if (err < 0)
5463                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5464 }
5465
5466 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5467 {
5468         struct net *net = dev_net(ifp->idev->dev);
5469
5470         if (event)
5471                 ASSERT_RTNL();
5472
5473         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5474
5475         switch (event) {
5476         case RTM_NEWADDR:
5477                 /*
5478                  * If the address was optimistic
5479                  * we inserted the route at the start of
5480                  * our DAD process, so we don't need
5481                  * to do it again
5482                  */
5483                 if (!(ifp->rt->rt6i_node))
5484                         ip6_ins_rt(ifp->rt);
5485                 if (ifp->idev->cnf.forwarding)
5486                         addrconf_join_anycast(ifp);
5487                 if (!ipv6_addr_any(&ifp->peer_addr))
5488                         addrconf_prefix_route(&ifp->peer_addr, 128,
5489                                               ifp->idev->dev, 0, 0);
5490                 break;
5491         case RTM_DELADDR:
5492                 if (ifp->idev->cnf.forwarding)
5493                         addrconf_leave_anycast(ifp);
5494                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5495                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5496                         struct rt6_info *rt;
5497
5498                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5499                                                        ifp->idev->dev, 0, 0);
5500                         if (rt)
5501                                 ip6_del_rt(rt);
5502                 }
5503                 if (ifp->rt) {
5504                         dst_hold(&ifp->rt->dst);
5505                         ip6_del_rt(ifp->rt);
5506                 }
5507                 rt_genid_bump_ipv6(net);
5508                 break;
5509         }
5510         atomic_inc(&net->ipv6.dev_addr_genid);
5511 }
5512
5513 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5514 {
5515         rcu_read_lock_bh();
5516         if (likely(ifp->idev->dead == 0))
5517                 __ipv6_ifa_notify(event, ifp);
5518         rcu_read_unlock_bh();
5519 }
5520
5521 #ifdef CONFIG_SYSCTL
5522
5523 static
5524 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5525                            void __user *buffer, size_t *lenp, loff_t *ppos)
5526 {
5527         int *valp = ctl->data;
5528         int val = *valp;
5529         loff_t pos = *ppos;
5530         struct ctl_table lctl;
5531         int ret;
5532
5533         /*
5534          * ctl->data points to idev->cnf.forwarding, we should
5535          * not modify it until we get the rtnl lock.
5536          */
5537         lctl = *ctl;
5538         lctl.data = &val;
5539
5540         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5541
5542         if (write)
5543                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5544         if (ret)
5545                 *ppos = pos;
5546         return ret;
5547 }
5548
5549 static
5550 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5551                         void __user *buffer, size_t *lenp, loff_t *ppos)
5552 {
5553         struct inet6_dev *idev = ctl->extra1;
5554         int min_mtu = IPV6_MIN_MTU;
5555         struct ctl_table lctl;
5556
5557         lctl = *ctl;
5558         lctl.extra1 = &min_mtu;
5559         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5560
5561         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5562 }
5563
5564 static void dev_disable_change(struct inet6_dev *idev)
5565 {
5566         struct netdev_notifier_info info;
5567
5568         if (!idev || !idev->dev)
5569                 return;
5570
5571         netdev_notifier_info_init(&info, idev->dev);
5572         if (idev->cnf.disable_ipv6)
5573                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5574         else
5575                 addrconf_notify(NULL, NETDEV_UP, &info);
5576 }
5577
5578 static void addrconf_disable_change(struct net *net, __s32 newf)
5579 {
5580         struct net_device *dev;
5581         struct inet6_dev *idev;
5582
5583         for_each_netdev(net, dev) {
5584                 idev = __in6_dev_get(dev);
5585                 if (idev) {
5586                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5587                         idev->cnf.disable_ipv6 = newf;
5588                         if (changed)
5589                                 dev_disable_change(idev);
5590                 }
5591         }
5592 }
5593
5594 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5595 {
5596         struct net *net;
5597         int old;
5598
5599         if (!rtnl_trylock())
5600                 return restart_syscall();
5601
5602         net = (struct net *)table->extra2;
5603         old = *p;
5604         *p = newf;
5605
5606         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5607                 rtnl_unlock();
5608                 return 0;
5609         }
5610
5611         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5612                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5613                 addrconf_disable_change(net, newf);
5614         } else if ((!newf) ^ (!old))
5615                 dev_disable_change((struct inet6_dev *)table->extra1);
5616
5617         rtnl_unlock();
5618         return 0;
5619 }
5620
5621 static
5622 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5623                             void __user *buffer, size_t *lenp, loff_t *ppos)
5624 {
5625         int *valp = ctl->data;
5626         int val = *valp;
5627         loff_t pos = *ppos;
5628         struct ctl_table lctl;
5629         int ret;
5630
5631         /*
5632          * ctl->data points to idev->cnf.disable_ipv6, we should
5633          * not modify it until we get the rtnl lock.
5634          */
5635         lctl = *ctl;
5636         lctl.data = &val;
5637
5638         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5639
5640         if (write)
5641                 ret = addrconf_disable_ipv6(ctl, valp, val);
5642         if (ret)
5643                 *ppos = pos;
5644         return ret;
5645 }
5646
5647 static
5648 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5649                               void __user *buffer, size_t *lenp, loff_t *ppos)
5650 {
5651         int *valp = ctl->data;
5652         int ret;
5653         int old, new;
5654
5655         old = *valp;
5656         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5657         new = *valp;
5658
5659         if (write && old != new) {
5660                 struct net *net = ctl->extra2;
5661
5662                 if (!rtnl_trylock())
5663                         return restart_syscall();
5664
5665                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5666                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5667                                                      NETCONFA_IFINDEX_DEFAULT,
5668                                                      net->ipv6.devconf_dflt);
5669                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5670                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5671                                                      NETCONFA_IFINDEX_ALL,
5672                                                      net->ipv6.devconf_all);
5673                 else {
5674                         struct inet6_dev *idev = ctl->extra1;
5675
5676                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5677                                                      idev->dev->ifindex,
5678                                                      &idev->cnf);
5679                 }
5680                 rtnl_unlock();
5681         }
5682
5683         return ret;
5684 }
5685
5686 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5687                                          void __user *buffer, size_t *lenp,
5688                                          loff_t *ppos)
5689 {
5690         int ret = 0;
5691         int new_val;
5692         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5693         struct net *net = (struct net *)ctl->extra2;
5694
5695         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5696
5697         if (write) {
5698                 new_val = *((int *)ctl->data);
5699
5700                 if (check_addr_gen_mode(new_val) < 0)
5701                         return -EINVAL;
5702
5703                 /* request for default */
5704                 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5705                         ipv6_devconf_dflt.addr_gen_mode = new_val;
5706
5707                 /* request for individual net device */
5708                 } else {
5709                         if (!idev)
5710                                 return ret;
5711
5712                         if (check_stable_privacy(idev, net, new_val) < 0)
5713                                 return -EINVAL;
5714
5715                         if (idev->cnf.addr_gen_mode != new_val) {
5716                                 idev->cnf.addr_gen_mode = new_val;
5717                                 rtnl_lock();
5718                                 addrconf_dev_config(idev->dev);
5719                                 rtnl_unlock();
5720                         }
5721                 }
5722         }
5723
5724         return ret;
5725 }
5726
5727 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5728                                          void __user *buffer, size_t *lenp,
5729                                          loff_t *ppos)
5730 {
5731         int err;
5732         struct in6_addr addr;
5733         char str[IPV6_MAX_STRLEN];
5734         struct ctl_table lctl = *ctl;
5735         struct net *net = ctl->extra2;
5736         struct ipv6_stable_secret *secret = ctl->data;
5737
5738         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5739                 return -EIO;
5740
5741         lctl.maxlen = IPV6_MAX_STRLEN;
5742         lctl.data = str;
5743
5744         if (!rtnl_trylock())
5745                 return restart_syscall();
5746
5747         if (!write && !secret->initialized) {
5748                 err = -EIO;
5749                 goto out;
5750         }
5751
5752         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5753         if (err >= sizeof(str)) {
5754                 err = -EIO;
5755                 goto out;
5756         }
5757
5758         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5759         if (err || !write)
5760                 goto out;
5761
5762         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5763                 err = -EIO;
5764                 goto out;
5765         }
5766
5767         secret->initialized = true;
5768         secret->secret = addr;
5769
5770         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5771                 struct net_device *dev;
5772
5773                 for_each_netdev(net, dev) {
5774                         struct inet6_dev *idev = __in6_dev_get(dev);
5775
5776                         if (idev) {
5777                                 idev->cnf.addr_gen_mode =
5778                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5779                         }
5780                 }
5781         } else {
5782                 struct inet6_dev *idev = ctl->extra1;
5783
5784                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5785         }
5786
5787 out:
5788         rtnl_unlock();
5789
5790         return err;
5791 }
5792
5793 static
5794 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5795                                                 int write,
5796                                                 void __user *buffer,
5797                                                 size_t *lenp,
5798                                                 loff_t *ppos)
5799 {
5800         int *valp = ctl->data;
5801         int val = *valp;
5802         loff_t pos = *ppos;
5803         struct ctl_table lctl;
5804         int ret;
5805
5806         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5807          * we should not modify it until we get the rtnl lock.
5808          */
5809         lctl = *ctl;
5810         lctl.data = &val;
5811
5812         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5813
5814         if (write)
5815                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5816         if (ret)
5817                 *ppos = pos;
5818         return ret;
5819 }
5820
5821 static int minus_one = -1;
5822 static const int one = 1;
5823 static const int two_five_five = 255;
5824
5825 static const struct ctl_table addrconf_sysctl[] = {
5826         {
5827                 .procname       = "forwarding",
5828                 .data           = &ipv6_devconf.forwarding,
5829                 .maxlen         = sizeof(int),
5830                 .mode           = 0644,
5831                 .proc_handler   = addrconf_sysctl_forward,
5832         },
5833         {
5834                 .procname       = "hop_limit",
5835                 .data           = &ipv6_devconf.hop_limit,
5836                 .maxlen         = sizeof(int),
5837                 .mode           = 0644,
5838                 .proc_handler   = proc_dointvec_minmax,
5839                 .extra1         = (void *)&one,
5840                 .extra2         = (void *)&two_five_five,
5841         },
5842         {
5843                 .procname       = "mtu",
5844                 .data           = &ipv6_devconf.mtu6,
5845                 .maxlen         = sizeof(int),
5846                 .mode           = 0644,
5847                 .proc_handler   = addrconf_sysctl_mtu,
5848         },
5849         {
5850                 .procname       = "accept_ra",
5851                 .data           = &ipv6_devconf.accept_ra,
5852                 .maxlen         = sizeof(int),
5853                 .mode           = 0644,
5854                 .proc_handler   = proc_dointvec,
5855         },
5856         {
5857                 .procname       = "accept_redirects",
5858                 .data           = &ipv6_devconf.accept_redirects,
5859                 .maxlen         = sizeof(int),
5860                 .mode           = 0644,
5861                 .proc_handler   = proc_dointvec,
5862         },
5863         {
5864                 .procname       = "autoconf",
5865                 .data           = &ipv6_devconf.autoconf,
5866                 .maxlen         = sizeof(int),
5867                 .mode           = 0644,
5868                 .proc_handler   = proc_dointvec,
5869         },
5870         {
5871                 .procname       = "dad_transmits",
5872                 .data           = &ipv6_devconf.dad_transmits,
5873                 .maxlen         = sizeof(int),
5874                 .mode           = 0644,
5875                 .proc_handler   = proc_dointvec,
5876         },
5877         {
5878                 .procname       = "router_solicitations",
5879                 .data           = &ipv6_devconf.rtr_solicits,
5880                 .maxlen         = sizeof(int),
5881                 .mode           = 0644,
5882                 .proc_handler   = proc_dointvec_minmax,
5883                 .extra1         = &minus_one,
5884         },
5885         {
5886                 .procname       = "router_solicitation_interval",
5887                 .data           = &ipv6_devconf.rtr_solicit_interval,
5888                 .maxlen         = sizeof(int),
5889                 .mode           = 0644,
5890                 .proc_handler   = proc_dointvec_jiffies,
5891         },
5892         {
5893                 .procname       = "router_solicitation_max_interval",
5894                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
5895                 .maxlen         = sizeof(int),
5896                 .mode           = 0644,
5897                 .proc_handler   = proc_dointvec_jiffies,
5898         },
5899         {
5900                 .procname       = "router_solicitation_delay",
5901                 .data           = &ipv6_devconf.rtr_solicit_delay,
5902                 .maxlen         = sizeof(int),
5903                 .mode           = 0644,
5904                 .proc_handler   = proc_dointvec_jiffies,
5905         },
5906         {
5907                 .procname       = "force_mld_version",
5908                 .data           = &ipv6_devconf.force_mld_version,
5909                 .maxlen         = sizeof(int),
5910                 .mode           = 0644,
5911                 .proc_handler   = proc_dointvec,
5912         },
5913         {
5914                 .procname       = "mldv1_unsolicited_report_interval",
5915                 .data           =
5916                         &ipv6_devconf.mldv1_unsolicited_report_interval,
5917                 .maxlen         = sizeof(int),
5918                 .mode           = 0644,
5919                 .proc_handler   = proc_dointvec_ms_jiffies,
5920         },
5921         {
5922                 .procname       = "mldv2_unsolicited_report_interval",
5923                 .data           =
5924                         &ipv6_devconf.mldv2_unsolicited_report_interval,
5925                 .maxlen         = sizeof(int),
5926                 .mode           = 0644,
5927                 .proc_handler   = proc_dointvec_ms_jiffies,
5928         },
5929         {
5930                 .procname       = "use_tempaddr",
5931                 .data           = &ipv6_devconf.use_tempaddr,
5932                 .maxlen         = sizeof(int),
5933                 .mode           = 0644,
5934                 .proc_handler   = proc_dointvec,
5935         },
5936         {
5937                 .procname       = "temp_valid_lft",
5938                 .data           = &ipv6_devconf.temp_valid_lft,
5939                 .maxlen         = sizeof(int),
5940                 .mode           = 0644,
5941                 .proc_handler   = proc_dointvec,
5942         },
5943         {
5944                 .procname       = "temp_prefered_lft",
5945                 .data           = &ipv6_devconf.temp_prefered_lft,
5946                 .maxlen         = sizeof(int),
5947                 .mode           = 0644,
5948                 .proc_handler   = proc_dointvec,
5949         },
5950         {
5951                 .procname       = "regen_max_retry",
5952                 .data           = &ipv6_devconf.regen_max_retry,
5953                 .maxlen         = sizeof(int),
5954                 .mode           = 0644,
5955                 .proc_handler   = proc_dointvec,
5956         },
5957         {
5958                 .procname       = "max_desync_factor",
5959                 .data           = &ipv6_devconf.max_desync_factor,
5960                 .maxlen         = sizeof(int),
5961                 .mode           = 0644,
5962                 .proc_handler   = proc_dointvec,
5963         },
5964         {
5965                 .procname       = "max_addresses",
5966                 .data           = &ipv6_devconf.max_addresses,
5967                 .maxlen         = sizeof(int),
5968                 .mode           = 0644,
5969                 .proc_handler   = proc_dointvec,
5970         },
5971         {
5972                 .procname       = "accept_ra_defrtr",
5973                 .data           = &ipv6_devconf.accept_ra_defrtr,
5974                 .maxlen         = sizeof(int),
5975                 .mode           = 0644,
5976                 .proc_handler   = proc_dointvec,
5977         },
5978         {
5979                 .procname       = "accept_ra_min_hop_limit",
5980                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5981                 .maxlen         = sizeof(int),
5982                 .mode           = 0644,
5983                 .proc_handler   = proc_dointvec,
5984         },
5985         {
5986                 .procname       = "accept_ra_pinfo",
5987                 .data           = &ipv6_devconf.accept_ra_pinfo,
5988                 .maxlen         = sizeof(int),
5989                 .mode           = 0644,
5990                 .proc_handler   = proc_dointvec,
5991         },
5992 #ifdef CONFIG_IPV6_ROUTER_PREF
5993         {
5994                 .procname       = "accept_ra_rtr_pref",
5995                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
5996                 .maxlen         = sizeof(int),
5997                 .mode           = 0644,
5998                 .proc_handler   = proc_dointvec,
5999         },
6000         {
6001                 .procname       = "router_probe_interval",
6002                 .data           = &ipv6_devconf.rtr_probe_interval,
6003                 .maxlen         = sizeof(int),
6004                 .mode           = 0644,
6005                 .proc_handler   = proc_dointvec_jiffies,
6006         },
6007 #ifdef CONFIG_IPV6_ROUTE_INFO
6008         {
6009                 .procname       = "accept_ra_rt_info_max_plen",
6010                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6011                 .maxlen         = sizeof(int),
6012                 .mode           = 0644,
6013                 .proc_handler   = proc_dointvec,
6014         },
6015 #endif
6016 #endif
6017         {
6018                 .procname       = "proxy_ndp",
6019                 .data           = &ipv6_devconf.proxy_ndp,
6020                 .maxlen         = sizeof(int),
6021                 .mode           = 0644,
6022                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6023         },
6024         {
6025                 .procname       = "accept_source_route",
6026                 .data           = &ipv6_devconf.accept_source_route,
6027                 .maxlen         = sizeof(int),
6028                 .mode           = 0644,
6029                 .proc_handler   = proc_dointvec,
6030         },
6031 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6032         {
6033                 .procname       = "optimistic_dad",
6034                 .data           = &ipv6_devconf.optimistic_dad,
6035                 .maxlen         = sizeof(int),
6036                 .mode           = 0644,
6037                 .proc_handler   = proc_dointvec,
6038         },
6039         {
6040                 .procname       = "use_optimistic",
6041                 .data           = &ipv6_devconf.use_optimistic,
6042                 .maxlen         = sizeof(int),
6043                 .mode           = 0644,
6044                 .proc_handler   = proc_dointvec,
6045         },
6046 #endif
6047 #ifdef CONFIG_IPV6_MROUTE
6048         {
6049                 .procname       = "mc_forwarding",
6050                 .data           = &ipv6_devconf.mc_forwarding,
6051                 .maxlen         = sizeof(int),
6052                 .mode           = 0444,
6053                 .proc_handler   = proc_dointvec,
6054         },
6055 #endif
6056         {
6057                 .procname       = "disable_ipv6",
6058                 .data           = &ipv6_devconf.disable_ipv6,
6059                 .maxlen         = sizeof(int),
6060                 .mode           = 0644,
6061                 .proc_handler   = addrconf_sysctl_disable,
6062         },
6063         {
6064                 .procname       = "accept_dad",
6065                 .data           = &ipv6_devconf.accept_dad,
6066                 .maxlen         = sizeof(int),
6067                 .mode           = 0644,
6068                 .proc_handler   = proc_dointvec,
6069         },
6070         {
6071                 .procname       = "force_tllao",
6072                 .data           = &ipv6_devconf.force_tllao,
6073                 .maxlen         = sizeof(int),
6074                 .mode           = 0644,
6075                 .proc_handler   = proc_dointvec
6076         },
6077         {
6078                 .procname       = "ndisc_notify",
6079                 .data           = &ipv6_devconf.ndisc_notify,
6080                 .maxlen         = sizeof(int),
6081                 .mode           = 0644,
6082                 .proc_handler   = proc_dointvec
6083         },
6084         {
6085                 .procname       = "suppress_frag_ndisc",
6086                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6087                 .maxlen         = sizeof(int),
6088                 .mode           = 0644,
6089                 .proc_handler   = proc_dointvec
6090         },
6091         {
6092                 .procname       = "accept_ra_from_local",
6093                 .data           = &ipv6_devconf.accept_ra_from_local,
6094                 .maxlen         = sizeof(int),
6095                 .mode           = 0644,
6096                 .proc_handler   = proc_dointvec,
6097         },
6098         {
6099                 .procname       = "accept_ra_mtu",
6100                 .data           = &ipv6_devconf.accept_ra_mtu,
6101                 .maxlen         = sizeof(int),
6102                 .mode           = 0644,
6103                 .proc_handler   = proc_dointvec,
6104         },
6105         {
6106                 .procname       = "stable_secret",
6107                 .data           = &ipv6_devconf.stable_secret,
6108                 .maxlen         = IPV6_MAX_STRLEN,
6109                 .mode           = 0600,
6110                 .proc_handler   = addrconf_sysctl_stable_secret,
6111         },
6112         {
6113                 .procname       = "use_oif_addrs_only",
6114                 .data           = &ipv6_devconf.use_oif_addrs_only,
6115                 .maxlen         = sizeof(int),
6116                 .mode           = 0644,
6117                 .proc_handler   = proc_dointvec,
6118         },
6119         {
6120                 .procname       = "ignore_routes_with_linkdown",
6121                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6122                 .maxlen         = sizeof(int),
6123                 .mode           = 0644,
6124                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6125         },
6126         {
6127                 .procname       = "drop_unicast_in_l2_multicast",
6128                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6129                 .maxlen         = sizeof(int),
6130                 .mode           = 0644,
6131                 .proc_handler   = proc_dointvec,
6132         },
6133         {
6134                 .procname       = "drop_unsolicited_na",
6135                 .data           = &ipv6_devconf.drop_unsolicited_na,
6136                 .maxlen         = sizeof(int),
6137                 .mode           = 0644,
6138                 .proc_handler   = proc_dointvec,
6139         },
6140         {
6141                 .procname       = "keep_addr_on_down",
6142                 .data           = &ipv6_devconf.keep_addr_on_down,
6143                 .maxlen         = sizeof(int),
6144                 .mode           = 0644,
6145                 .proc_handler   = proc_dointvec,
6146
6147         },
6148         {
6149                 .procname       = "seg6_enabled",
6150                 .data           = &ipv6_devconf.seg6_enabled,
6151                 .maxlen         = sizeof(int),
6152                 .mode           = 0644,
6153                 .proc_handler   = proc_dointvec,
6154         },
6155 #ifdef CONFIG_IPV6_SEG6_HMAC
6156         {
6157                 .procname       = "seg6_require_hmac",
6158                 .data           = &ipv6_devconf.seg6_require_hmac,
6159                 .maxlen         = sizeof(int),
6160                 .mode           = 0644,
6161                 .proc_handler   = proc_dointvec,
6162         },
6163 #endif
6164         {
6165                 .procname       = "enhanced_dad",
6166                 .data           = &ipv6_devconf.enhanced_dad,
6167                 .maxlen         = sizeof(int),
6168                 .mode           = 0644,
6169                 .proc_handler   = proc_dointvec,
6170         },
6171         {
6172                 .procname               = "addr_gen_mode",
6173                 .data                   = &ipv6_devconf.addr_gen_mode,
6174                 .maxlen                 = sizeof(int),
6175                 .mode                   = 0644,
6176                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6177         },
6178         {
6179                 /* sentinel */
6180         }
6181 };
6182
6183 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6184                 struct inet6_dev *idev, struct ipv6_devconf *p)
6185 {
6186         int i, ifindex;
6187         struct ctl_table *table;
6188         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6189
6190         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6191         if (!table)
6192                 goto out;
6193
6194         for (i = 0; table[i].data; i++) {
6195                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6196                 /* If one of these is already set, then it is not safe to
6197                  * overwrite either of them: this makes proc_dointvec_minmax
6198                  * usable.
6199                  */
6200                 if (!table[i].extra1 && !table[i].extra2) {
6201                         table[i].extra1 = idev; /* embedded; no ref */
6202                         table[i].extra2 = net;
6203                 }
6204         }
6205
6206         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6207
6208         p->sysctl_header = register_net_sysctl(net, path, table);
6209         if (!p->sysctl_header)
6210                 goto free;
6211
6212         if (!strcmp(dev_name, "all"))
6213                 ifindex = NETCONFA_IFINDEX_ALL;
6214         else if (!strcmp(dev_name, "default"))
6215                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6216         else
6217                 ifindex = idev->dev->ifindex;
6218         inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6219         return 0;
6220
6221 free:
6222         kfree(table);
6223 out:
6224         return -ENOBUFS;
6225 }
6226
6227 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6228 {
6229         struct ctl_table *table;
6230
6231         if (!p->sysctl_header)
6232                 return;
6233
6234         table = p->sysctl_header->ctl_table_arg;
6235         unregister_net_sysctl_table(p->sysctl_header);
6236         p->sysctl_header = NULL;
6237         kfree(table);
6238 }
6239
6240 static int addrconf_sysctl_register(struct inet6_dev *idev)
6241 {
6242         int err;
6243
6244         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6245                 return -EINVAL;
6246
6247         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6248                                     &ndisc_ifinfo_sysctl_change);
6249         if (err)
6250                 return err;
6251         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6252                                          idev, &idev->cnf);
6253         if (err)
6254                 neigh_sysctl_unregister(idev->nd_parms);
6255
6256         return err;
6257 }
6258
6259 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6260 {
6261         __addrconf_sysctl_unregister(&idev->cnf);
6262         neigh_sysctl_unregister(idev->nd_parms);
6263 }
6264
6265
6266 #endif
6267
6268 static int __net_init addrconf_init_net(struct net *net)
6269 {
6270         int err = -ENOMEM;
6271         struct ipv6_devconf *all, *dflt;
6272
6273         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6274         if (!all)
6275                 goto err_alloc_all;
6276
6277         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6278         if (!dflt)
6279                 goto err_alloc_dflt;
6280
6281         /* these will be inherited by all namespaces */
6282         dflt->autoconf = ipv6_defaults.autoconf;
6283         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6284
6285         dflt->stable_secret.initialized = false;
6286         all->stable_secret.initialized = false;
6287
6288         net->ipv6.devconf_all = all;
6289         net->ipv6.devconf_dflt = dflt;
6290
6291 #ifdef CONFIG_SYSCTL
6292         err = __addrconf_sysctl_register(net, "all", NULL, all);
6293         if (err < 0)
6294                 goto err_reg_all;
6295
6296         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6297         if (err < 0)
6298                 goto err_reg_dflt;
6299 #endif
6300         return 0;
6301
6302 #ifdef CONFIG_SYSCTL
6303 err_reg_dflt:
6304         __addrconf_sysctl_unregister(all);
6305 err_reg_all:
6306         kfree(dflt);
6307 #endif
6308 err_alloc_dflt:
6309         kfree(all);
6310 err_alloc_all:
6311         return err;
6312 }
6313
6314 static void __net_exit addrconf_exit_net(struct net *net)
6315 {
6316 #ifdef CONFIG_SYSCTL
6317         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6318         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6319 #endif
6320         kfree(net->ipv6.devconf_dflt);
6321         kfree(net->ipv6.devconf_all);
6322 }
6323
6324 static struct pernet_operations addrconf_ops = {
6325         .init = addrconf_init_net,
6326         .exit = addrconf_exit_net,
6327 };
6328
6329 static struct rtnl_af_ops inet6_ops __read_mostly = {
6330         .family           = AF_INET6,
6331         .fill_link_af     = inet6_fill_link_af,
6332         .get_link_af_size = inet6_get_link_af_size,
6333         .validate_link_af = inet6_validate_link_af,
6334         .set_link_af      = inet6_set_link_af,
6335 };
6336
6337 /*
6338  *      Init / cleanup code
6339  */
6340
6341 int __init addrconf_init(void)
6342 {
6343         struct inet6_dev *idev;
6344         int i, err;
6345
6346         err = ipv6_addr_label_init();
6347         if (err < 0) {
6348                 pr_crit("%s: cannot initialize default policy table: %d\n",
6349                         __func__, err);
6350                 goto out;
6351         }
6352
6353         err = register_pernet_subsys(&addrconf_ops);
6354         if (err < 0)
6355                 goto out_addrlabel;
6356
6357         addrconf_wq = create_workqueue("ipv6_addrconf");
6358         if (!addrconf_wq) {
6359                 err = -ENOMEM;
6360                 goto out_nowq;
6361         }
6362
6363         /* The addrconf netdev notifier requires that loopback_dev
6364          * has it's ipv6 private information allocated and setup
6365          * before it can bring up and give link-local addresses
6366          * to other devices which are up.
6367          *
6368          * Unfortunately, loopback_dev is not necessarily the first
6369          * entry in the global dev_base list of net devices.  In fact,
6370          * it is likely to be the very last entry on that list.
6371          * So this causes the notifier registry below to try and
6372          * give link-local addresses to all devices besides loopback_dev
6373          * first, then loopback_dev, which cases all the non-loopback_dev
6374          * devices to fail to get a link-local address.
6375          *
6376          * So, as a temporary fix, allocate the ipv6 structure for
6377          * loopback_dev first by hand.
6378          * Longer term, all of the dependencies ipv6 has upon the loopback
6379          * device and it being up should be removed.
6380          */
6381         rtnl_lock();
6382         idev = ipv6_add_dev(init_net.loopback_dev);
6383         rtnl_unlock();
6384         if (IS_ERR(idev)) {
6385                 err = PTR_ERR(idev);
6386                 goto errlo;
6387         }
6388
6389         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6390                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6391
6392         register_netdevice_notifier(&ipv6_dev_notf);
6393
6394         addrconf_verify();
6395
6396         rtnl_af_register(&inet6_ops);
6397
6398         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6399                               NULL);
6400         if (err < 0)
6401                 goto errout;
6402
6403         /* Only the first call to __rtnl_register can fail */
6404         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6405         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6406         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6407                         inet6_dump_ifaddr, NULL);
6408         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6409                         inet6_dump_ifmcaddr, NULL);
6410         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6411                         inet6_dump_ifacaddr, NULL);
6412         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6413                         inet6_netconf_dump_devconf, NULL);
6414
6415         ipv6_addr_label_rtnl_register();
6416
6417         return 0;
6418 errout:
6419         rtnl_af_unregister(&inet6_ops);
6420         unregister_netdevice_notifier(&ipv6_dev_notf);
6421 errlo:
6422         destroy_workqueue(addrconf_wq);
6423 out_nowq:
6424         unregister_pernet_subsys(&addrconf_ops);
6425 out_addrlabel:
6426         ipv6_addr_label_cleanup();
6427 out:
6428         return err;
6429 }
6430
6431 void addrconf_cleanup(void)
6432 {
6433         struct net_device *dev;
6434         int i;
6435
6436         unregister_netdevice_notifier(&ipv6_dev_notf);
6437         unregister_pernet_subsys(&addrconf_ops);
6438         ipv6_addr_label_cleanup();
6439
6440         rtnl_lock();
6441
6442         __rtnl_af_unregister(&inet6_ops);
6443
6444         /* clean dev list */
6445         for_each_netdev(&init_net, dev) {
6446                 if (__in6_dev_get(dev) == NULL)
6447                         continue;
6448                 addrconf_ifdown(dev, 1);
6449         }
6450         addrconf_ifdown(init_net.loopback_dev, 2);
6451
6452         /*
6453          *      Check hash table.
6454          */
6455         spin_lock_bh(&addrconf_hash_lock);
6456         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6457                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6458         spin_unlock_bh(&addrconf_hash_lock);
6459         cancel_delayed_work(&addr_chk_work);
6460         rtnl_unlock();
6461
6462         destroy_workqueue(addrconf_wq);
6463 }