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/sched/signal.h>
  47 #include <linux/socket.h>
  48 #include <linux/sockios.h>
  49 #include <linux/net.h>
  50 #include <linux/inet.h>
  51 #include <linux/in6.h>
  52 #include <linux/netdevice.h>
  53 #include <linux/if_addr.h>
  54 #include <linux/if_arp.h>
  55 #include <linux/if_arcnet.h>
  56 #include <linux/if_infiniband.h>
  57 #include <linux/route.h>
  58 #include <linux/inetdevice.h>
  59 #include <linux/init.h>
  60 #include <linux/slab.h>
  61 #ifdef CONFIG_SYSCTL
  62 #include <linux/sysctl.h>
  63 #endif
  64 #include <linux/capability.h>
  65 #include <linux/delay.h>
  66 #include <linux/notifier.h>
  67 #include <linux/string.h>
  68 #include <linux/hash.h>
  69
  70 #include <net/net_namespace.h>
  71 #include <net/sock.h>
  72 #include <net/snmp.h>
  73
  74 #include <net/6lowpan.h>
  75 #include <net/firewire.h>
  76 #include <net/ipv6.h>
  77 #include <net/protocol.h>
  78 #include <net/ndisc.h>
  79 #include <net/ip6_route.h>
  80 #include <net/addrconf.h>
  81 #include <net/tcp.h>
  82 #include <net/ip.h>
  83 #include <net/netlink.h>
  84 #include <net/pkt_sched.h>
  85 #include <net/l3mdev.h>
  86 #include <linux/if_tunnel.h>
  87 #include <linux/rtnetlink.h>
  88 #include <linux/netconf.h>
  89 #include <linux/random.h>
  90 #include <linux/uaccess.h>
  91 #include <asm/unaligned.h>
  92
  93 #include <linux/proc_fs.h>
  94 #include <linux/seq_file.h>
  95 #include <linux/export.h>
  96
  97 /* Set to 3 to get tracing... */
  98 #define ACONF_DEBUG 2
  99
 100 #if ACONF_DEBUG >= 3
 101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
 102 #else
 103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 104 #endif
 105
 106 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 107
 108 #define IPV6_MAX_STRLEN \
 109         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
 110
 111 static inline u32 cstamp_delta(unsigned long cstamp)
 112 {
 113         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 114 }
 115
 116 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 117 {
 118         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 119         u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
 120         do_div(tmp, 1000000);
 121         return (s32)tmp;
 122 }
 123
 124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 125 {
 126         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 127         u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
 128         do_div(tmp, 1000000);
 129         if ((s32)tmp > mrt) {
 130                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 131                 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
 132                 do_div(tmp, 1000000);
 133         }
 134         return (s32)tmp;
 135 }
 136
 137 #ifdef CONFIG_SYSCTL
 138 static int addrconf_sysctl_register(struct inet6_dev *idev);
 139 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 140 #else
 141 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 142 {
 143         return 0;
 144 }
 145
 146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 147 {
 148 }
 149 #endif
 150
 151 static void ipv6_regen_rndid(struct inet6_dev *idev);
 152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 153
 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 155 static int ipv6_count_addresses(const struct inet6_dev *idev);
 156 static int ipv6_generate_stable_address(struct in6_addr *addr,
 157                                         u8 dad_count,
 158                                         const struct inet6_dev *idev);
 159
 160 #define IN6_ADDR_HSIZE_SHIFT    8
 161 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
 162 /*
 163  *      Configured unicast address hash table
 164  */
 165 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 166 static DEFINE_SPINLOCK(addrconf_hash_lock);
 167
 168 static void addrconf_verify(void);
 169 static void addrconf_verify_rtnl(void);
 170 static void addrconf_verify_work(struct work_struct *);
 171
 172 static struct workqueue_struct *addrconf_wq;
 173 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 174
 175 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 176 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 177
 178 static void addrconf_type_change(struct net_device *dev,
 179                                  unsigned long event);
 180 static int addrconf_ifdown(struct net_device *dev, int how);
 181
 182 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 183                                                   int plen,
 184                                                   const struct net_device *dev,
 185                                                   u32 flags, u32 noflags);
 186
 187 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 188 static void addrconf_dad_work(struct work_struct *w);
 189 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
 190 static void addrconf_dad_run(struct inet6_dev *idev);
 191 static void addrconf_rs_timer(unsigned long data);
 192 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 193 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 194
 195 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 196                                 struct prefix_info *pinfo);
 197
 198 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 199         .forwarding             = 0,
 200         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 201         .mtu6                   = IPV6_MIN_MTU,
 202         .accept_ra              = 1,
 203         .accept_redirects       = 1,
 204         .autoconf               = 1,
 205         .force_mld_version      = 0,
 206         .mldv1_unsolicited_report_interval = 10 * HZ,
 207         .mldv2_unsolicited_report_interval = HZ,
 208         .dad_transmits          = 1,
 209         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 210         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 211         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 212         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 213         .use_tempaddr           = 0,
 214         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 215         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 216         .regen_max_retry        = REGEN_MAX_RETRY,
 217         .max_desync_factor      = MAX_DESYNC_FACTOR,
 218         .max_addresses          = IPV6_MAX_ADDRESSES,
 219         .accept_ra_defrtr       = 1,
 220         .accept_ra_from_local   = 0,
 221         .accept_ra_min_hop_limit= 1,
 222         .accept_ra_pinfo        = 1,
 223 #ifdef CONFIG_IPV6_ROUTER_PREF
 224         .accept_ra_rtr_pref     = 1,
 225         .rtr_probe_interval     = 60 * HZ,
 226 #ifdef CONFIG_IPV6_ROUTE_INFO
 227         .accept_ra_rt_info_min_plen = 0,
 228         .accept_ra_rt_info_max_plen = 0,
 229 #endif
 230 #endif
 231         .proxy_ndp              = 0,
 232         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 233         .disable_ipv6           = 0,
 234         .accept_dad             = 0,
 235         .suppress_frag_ndisc    = 1,
 236         .accept_ra_mtu          = 1,
 237         .stable_secret          = {
 238                 .initialized = false,
 239         },
 240         .use_oif_addrs_only     = 0,
 241         .ignore_routes_with_linkdown = 0,
 242         .keep_addr_on_down      = 0,
 243         .seg6_enabled           = 0,
 244 #ifdef CONFIG_IPV6_SEG6_HMAC
 245         .seg6_require_hmac      = 0,
 246 #endif
 247         .enhanced_dad           = 1,
 248         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 249         .disable_policy         = 0,
 250 };
 251
 252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 253         .forwarding             = 0,
 254         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 255         .mtu6                   = IPV6_MIN_MTU,
 256         .accept_ra              = 1,
 257         .accept_redirects       = 1,
 258         .autoconf               = 1,
 259         .force_mld_version      = 0,
 260         .mldv1_unsolicited_report_interval = 10 * HZ,
 261         .mldv2_unsolicited_report_interval = HZ,
 262         .dad_transmits          = 1,
 263         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 264         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 265         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 266         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 267         .use_tempaddr           = 0,
 268         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 269         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 270         .regen_max_retry        = REGEN_MAX_RETRY,
 271         .max_desync_factor      = MAX_DESYNC_FACTOR,
 272         .max_addresses          = IPV6_MAX_ADDRESSES,
 273         .accept_ra_defrtr       = 1,
 274         .accept_ra_from_local   = 0,
 275         .accept_ra_min_hop_limit= 1,
 276         .accept_ra_pinfo        = 1,
 277 #ifdef CONFIG_IPV6_ROUTER_PREF
 278         .accept_ra_rtr_pref     = 1,
 279         .rtr_probe_interval     = 60 * HZ,
 280 #ifdef CONFIG_IPV6_ROUTE_INFO
 281         .accept_ra_rt_info_min_plen = 0,
 282         .accept_ra_rt_info_max_plen = 0,
 283 #endif
 284 #endif
 285         .proxy_ndp              = 0,
 286         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 287         .disable_ipv6           = 0,
 288         .accept_dad             = 1,
 289         .suppress_frag_ndisc    = 1,
 290         .accept_ra_mtu          = 1,
 291         .stable_secret          = {
 292                 .initialized = false,
 293         },
 294         .use_oif_addrs_only     = 0,
 295         .ignore_routes_with_linkdown = 0,
 296         .keep_addr_on_down      = 0,
 297         .seg6_enabled           = 0,
 298 #ifdef CONFIG_IPV6_SEG6_HMAC
 299         .seg6_require_hmac      = 0,
 300 #endif
 301         .enhanced_dad           = 1,
 302         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 303         .disable_policy         = 0,
 304 };
 305
 306 /* Check if link is ready: is it up and is a valid qdisc available */
 307 static inline bool addrconf_link_ready(const struct net_device *dev)
 308 {
 309         return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
 310 }
 311
 312 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 313 {
 314         if (del_timer(&idev->rs_timer))
 315                 __in6_dev_put(idev);
 316 }
 317
 318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 319 {
 320         if (cancel_delayed_work(&ifp->dad_work))
 321                 __in6_ifa_put(ifp);
 322 }
 323
 324 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 325                                   unsigned long when)
 326 {
 327         if (!timer_pending(&idev->rs_timer))
 328                 in6_dev_hold(idev);
 329         mod_timer(&idev->rs_timer, jiffies + when);
 330 }
 331
 332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 333                                    unsigned long delay)
 334 {
 335         in6_ifa_hold(ifp);
 336         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 337                 in6_ifa_put(ifp);
 338 }
 339
 340 static int snmp6_alloc_dev(struct inet6_dev *idev)
 341 {
 342         int i;
 343
 344         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 345         if (!idev->stats.ipv6)
 346                 goto err_ip;
 347
 348         for_each_possible_cpu(i) {
 349                 struct ipstats_mib *addrconf_stats;
 350                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 351                 u64_stats_init(&addrconf_stats->syncp);
 352         }
 353
 354
 355         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 356                                         GFP_KERNEL);
 357         if (!idev->stats.icmpv6dev)
 358                 goto err_icmp;
 359         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 360                                            GFP_KERNEL);
 361         if (!idev->stats.icmpv6msgdev)
 362                 goto err_icmpmsg;
 363
 364         return 0;
 365
 366 err_icmpmsg:
 367         kfree(idev->stats.icmpv6dev);
 368 err_icmp:
 369         free_percpu(idev->stats.ipv6);
 370 err_ip:
 371         return -ENOMEM;
 372 }
 373
 374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 375 {
 376         struct inet6_dev *ndev;
 377         int err = -ENOMEM;
 378
 379         ASSERT_RTNL();
 380
 381         if (dev->mtu < IPV6_MIN_MTU)
 382                 return ERR_PTR(-EINVAL);
 383
 384         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 385         if (!ndev)
 386                 return ERR_PTR(err);
 387
 388         rwlock_init(&ndev->lock);
 389         ndev->dev = dev;
 390         INIT_LIST_HEAD(&ndev->addr_list);
 391         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 392                     (unsigned long)ndev);
 393         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 394
 395         if (ndev->cnf.stable_secret.initialized)
 396                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 397         else
 398                 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
 399
 400         ndev->cnf.mtu6 = dev->mtu;
 401         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 402         if (!ndev->nd_parms) {
 403                 kfree(ndev);
 404                 return ERR_PTR(err);
 405         }
 406         if (ndev->cnf.forwarding)
 407                 dev_disable_lro(dev);
 408         /* We refer to the device */
 409         dev_hold(dev);
 410
 411         if (snmp6_alloc_dev(ndev) < 0) {
 412                 ADBG(KERN_WARNING
 413                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 414                         __func__, dev->name);
 415                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 416                 dev_put(dev);
 417                 kfree(ndev);
 418                 return ERR_PTR(err);
 419         }
 420
 421         if (snmp6_register_dev(ndev) < 0) {
 422                 ADBG(KERN_WARNING
 423                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 424                         __func__, dev->name);
 425                 goto err_release;
 426         }
 427
 428         /* One reference from device. */
 429         refcount_set(&ndev->refcnt, 1);
 430
 431         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 432                 ndev->cnf.accept_dad = -1;
 433
 434 #if IS_ENABLED(CONFIG_IPV6_SIT)
 435         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 436                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 437                 ndev->cnf.rtr_solicits = 0;
 438         }
 439 #endif
 440
 441         INIT_LIST_HEAD(&ndev->tempaddr_list);
 442         ndev->desync_factor = U32_MAX;
 443         if ((dev->flags&IFF_LOOPBACK) ||
 444             dev->type == ARPHRD_TUNNEL ||
 445             dev->type == ARPHRD_TUNNEL6 ||
 446             dev->type == ARPHRD_SIT ||
 447             dev->type == ARPHRD_NONE) {
 448                 ndev->cnf.use_tempaddr = -1;
 449         } else
 450                 ipv6_regen_rndid(ndev);
 451
 452         ndev->token = in6addr_any;
 453
 454         if (netif_running(dev) && addrconf_link_ready(dev))
 455                 ndev->if_flags |= IF_READY;
 456
 457         ipv6_mc_init_dev(ndev);
 458         ndev->tstamp = jiffies;
 459         err = addrconf_sysctl_register(ndev);
 460         if (err) {
 461                 ipv6_mc_destroy_dev(ndev);
 462                 snmp6_unregister_dev(ndev);
 463                 goto err_release;
 464         }
 465         /* protected by rtnl_lock */
 466         rcu_assign_pointer(dev->ip6_ptr, ndev);
 467
 468         /* Join interface-local all-node multicast group */
 469         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 470
 471         /* Join all-node multicast group */
 472         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 473
 474         /* Join all-router multicast group if forwarding is set */
 475         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 476                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 477
 478         return ndev;
 479
 480 err_release:
 481         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 482         ndev->dead = 1;
 483         in6_dev_finish_destroy(ndev);
 484         return ERR_PTR(err);
 485 }
 486
 487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 488 {
 489         struct inet6_dev *idev;
 490
 491         ASSERT_RTNL();
 492
 493         idev = __in6_dev_get(dev);
 494         if (!idev) {
 495                 idev = ipv6_add_dev(dev);
 496                 if (IS_ERR(idev))
 497                         return NULL;
 498         }
 499
 500         if (dev->flags&IFF_UP)
 501                 ipv6_mc_up(idev);
 502         return idev;
 503 }
 504
 505 static int inet6_netconf_msgsize_devconf(int type)
 506 {
 507         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 508                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 509         bool all = false;
 510
 511         if (type == NETCONFA_ALL)
 512                 all = true;
 513
 514         if (all || type == NETCONFA_FORWARDING)
 515                 size += nla_total_size(4);
 516 #ifdef CONFIG_IPV6_MROUTE
 517         if (all || type == NETCONFA_MC_FORWARDING)
 518                 size += nla_total_size(4);
 519 #endif
 520         if (all || type == NETCONFA_PROXY_NEIGH)
 521                 size += nla_total_size(4);
 522
 523         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 524                 size += nla_total_size(4);
 525
 526         return size;
 527 }
 528
 529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 530                                       struct ipv6_devconf *devconf, u32 portid,
 531                                       u32 seq, int event, unsigned int flags,
 532                                       int type)
 533 {
 534         struct nlmsghdr  *nlh;
 535         struct netconfmsg *ncm;
 536         bool all = false;
 537
 538         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 539                         flags);
 540         if (!nlh)
 541                 return -EMSGSIZE;
 542
 543         if (type == NETCONFA_ALL)
 544                 all = true;
 545
 546         ncm = nlmsg_data(nlh);
 547         ncm->ncm_family = AF_INET6;
 548
 549         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 550                 goto nla_put_failure;
 551
 552         if (!devconf)
 553                 goto out;
 554
 555         if ((all || type == NETCONFA_FORWARDING) &&
 556             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 557                 goto nla_put_failure;
 558 #ifdef CONFIG_IPV6_MROUTE
 559         if ((all || type == NETCONFA_MC_FORWARDING) &&
 560             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 561                         devconf->mc_forwarding) < 0)
 562                 goto nla_put_failure;
 563 #endif
 564         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 565             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 566                 goto nla_put_failure;
 567
 568         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 569             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 570                         devconf->ignore_routes_with_linkdown) < 0)
 571                 goto nla_put_failure;
 572
 573 out:
 574         nlmsg_end(skb, nlh);
 575         return 0;
 576
 577 nla_put_failure:
 578         nlmsg_cancel(skb, nlh);
 579         return -EMSGSIZE;
 580 }
 581
 582 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 583                                   int ifindex, struct ipv6_devconf *devconf)
 584 {
 585         struct sk_buff *skb;
 586         int err = -ENOBUFS;
 587
 588         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 589         if (!skb)
 590                 goto errout;
 591
 592         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 593                                          event, 0, type);
 594         if (err < 0) {
 595                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 596                 WARN_ON(err == -EMSGSIZE);
 597                 kfree_skb(skb);
 598                 goto errout;
 599         }
 600         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 601         return;
 602 errout:
 603         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 604 }
 605
 606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 607         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 608         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 609         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 610         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 611 };
 612
 613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 614                                      struct nlmsghdr *nlh,
 615                                      struct netlink_ext_ack *extack)
 616 {
 617         struct net *net = sock_net(in_skb->sk);
 618         struct nlattr *tb[NETCONFA_MAX+1];
 619         struct inet6_dev *in6_dev = NULL;
 620         struct net_device *dev = NULL;
 621         struct netconfmsg *ncm;
 622         struct sk_buff *skb;
 623         struct ipv6_devconf *devconf;
 624         int ifindex;
 625         int err;
 626
 627         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 628                           devconf_ipv6_policy, extack);
 629         if (err < 0)
 630                 return err;
 631
 632         if (!tb[NETCONFA_IFINDEX])
 633                 return -EINVAL;
 634
 635         err = -EINVAL;
 636         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 637         switch (ifindex) {
 638         case NETCONFA_IFINDEX_ALL:
 639                 devconf = net->ipv6.devconf_all;
 640                 break;
 641         case NETCONFA_IFINDEX_DEFAULT:
 642                 devconf = net->ipv6.devconf_dflt;
 643                 break;
 644         default:
 645                 dev = dev_get_by_index(net, ifindex);
 646                 if (!dev)
 647                         return -EINVAL;
 648                 in6_dev = in6_dev_get(dev);
 649                 if (!in6_dev)
 650                         goto errout;
 651                 devconf = &in6_dev->cnf;
 652                 break;
 653         }
 654
 655         err = -ENOBUFS;
 656         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
 657         if (!skb)
 658                 goto errout;
 659
 660         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 661                                          NETLINK_CB(in_skb).portid,
 662                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 663                                          NETCONFA_ALL);
 664         if (err < 0) {
 665                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 666                 WARN_ON(err == -EMSGSIZE);
 667                 kfree_skb(skb);
 668                 goto errout;
 669         }
 670         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 671 errout:
 672         if (in6_dev)
 673                 in6_dev_put(in6_dev);
 674         if (dev)
 675                 dev_put(dev);
 676         return err;
 677 }
 678
 679 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 680                                       struct netlink_callback *cb)
 681 {
 682         struct net *net = sock_net(skb->sk);
 683         int h, s_h;
 684         int idx, s_idx;
 685         struct net_device *dev;
 686         struct inet6_dev *idev;
 687         struct hlist_head *head;
 688
 689         s_h = cb->args[0];
 690         s_idx = idx = cb->args[1];
 691
 692         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 693                 idx = 0;
 694                 head = &net->dev_index_head[h];
 695                 rcu_read_lock();
 696                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 697                           net->dev_base_seq;
 698                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 699                         if (idx < s_idx)
 700                                 goto cont;
 701                         idev = __in6_dev_get(dev);
 702                         if (!idev)
 703                                 goto cont;
 704
 705                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 706                                                        &idev->cnf,
 707                                                        NETLINK_CB(cb->skb).portid,
 708                                                        cb->nlh->nlmsg_seq,
 709                                                        RTM_NEWNETCONF,
 710                                                        NLM_F_MULTI,
 711                                                        NETCONFA_ALL) < 0) {
 712                                 rcu_read_unlock();
 713                                 goto done;
 714                         }
 715                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 716 cont:
 717                         idx++;
 718                 }
 719                 rcu_read_unlock();
 720         }
 721         if (h == NETDEV_HASHENTRIES) {
 722                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 723                                                net->ipv6.devconf_all,
 724                                                NETLINK_CB(cb->skb).portid,
 725                                                cb->nlh->nlmsg_seq,
 726                                                RTM_NEWNETCONF, NLM_F_MULTI,
 727                                                NETCONFA_ALL) < 0)
 728                         goto done;
 729                 else
 730                         h++;
 731         }
 732         if (h == NETDEV_HASHENTRIES + 1) {
 733                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 734                                                net->ipv6.devconf_dflt,
 735                                                NETLINK_CB(cb->skb).portid,
 736                                                cb->nlh->nlmsg_seq,
 737                                                RTM_NEWNETCONF, NLM_F_MULTI,
 738                                                NETCONFA_ALL) < 0)
 739                         goto done;
 740                 else
 741                         h++;
 742         }
 743 done:
 744         cb->args[0] = h;
 745         cb->args[1] = idx;
 746
 747         return skb->len;
 748 }
 749
 750 #ifdef CONFIG_SYSCTL
 751 static void dev_forward_change(struct inet6_dev *idev)
 752 {
 753         struct net_device *dev;
 754         struct inet6_ifaddr *ifa;
 755
 756         if (!idev)
 757                 return;
 758         dev = idev->dev;
 759         if (idev->cnf.forwarding)
 760                 dev_disable_lro(dev);
 761         if (dev->flags & IFF_MULTICAST) {
 762                 if (idev->cnf.forwarding) {
 763                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 764                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 765                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 766                 } else {
 767                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 768                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 769                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 770                 }
 771         }
 772
 773         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 774                 if (ifa->flags&IFA_F_TENTATIVE)
 775                         continue;
 776                 if (idev->cnf.forwarding)
 777                         addrconf_join_anycast(ifa);
 778                 else
 779                         addrconf_leave_anycast(ifa);
 780         }
 781         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 782                                      NETCONFA_FORWARDING,
 783                                      dev->ifindex, &idev->cnf);
 784 }
 785
 786
 787 static void addrconf_forward_change(struct net *net, __s32 newf)
 788 {
 789         struct net_device *dev;
 790         struct inet6_dev *idev;
 791
 792         for_each_netdev(net, dev) {
 793                 idev = __in6_dev_get(dev);
 794                 if (idev) {
 795                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 796                         idev->cnf.forwarding = newf;
 797                         if (changed)
 798                                 dev_forward_change(idev);
 799                 }
 800         }
 801 }
 802
 803 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 804 {
 805         struct net *net;
 806         int old;
 807
 808         if (!rtnl_trylock())
 809                 return restart_syscall();
 810
 811         net = (struct net *)table->extra2;
 812         old = *p;
 813         *p = newf;
 814
 815         if (p == &net->ipv6.devconf_dflt->forwarding) {
 816                 if ((!newf) ^ (!old))
 817                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 818                                                      NETCONFA_FORWARDING,
 819                                                      NETCONFA_IFINDEX_DEFAULT,
 820                                                      net->ipv6.devconf_dflt);
 821                 rtnl_unlock();
 822                 return 0;
 823         }
 824
 825         if (p == &net->ipv6.devconf_all->forwarding) {
 826                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 827
 828                 net->ipv6.devconf_dflt->forwarding = newf;
 829                 if ((!newf) ^ (!old_dflt))
 830                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 831                                                      NETCONFA_FORWARDING,
 832                                                      NETCONFA_IFINDEX_DEFAULT,
 833                                                      net->ipv6.devconf_dflt);
 834
 835                 addrconf_forward_change(net, newf);
 836                 if ((!newf) ^ (!old))
 837                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 838                                                      NETCONFA_FORWARDING,
 839                                                      NETCONFA_IFINDEX_ALL,
 840                                                      net->ipv6.devconf_all);
 841         } else if ((!newf) ^ (!old))
 842                 dev_forward_change((struct inet6_dev *)table->extra1);
 843         rtnl_unlock();
 844
 845         if (newf)
 846                 rt6_purge_dflt_routers(net);
 847         return 1;
 848 }
 849
 850 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 851 {
 852         struct net_device *dev;
 853         struct inet6_dev *idev;
 854
 855         for_each_netdev(net, dev) {
 856                 idev = __in6_dev_get(dev);
 857                 if (idev) {
 858                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 859
 860                         idev->cnf.ignore_routes_with_linkdown = newf;
 861                         if (changed)
 862                                 inet6_netconf_notify_devconf(dev_net(dev),
 863                                                              RTM_NEWNETCONF,
 864                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 865                                                              dev->ifindex,
 866                                                              &idev->cnf);
 867                 }
 868         }
 869 }
 870
 871 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 872 {
 873         struct net *net;
 874         int old;
 875
 876         if (!rtnl_trylock())
 877                 return restart_syscall();
 878
 879         net = (struct net *)table->extra2;
 880         old = *p;
 881         *p = newf;
 882
 883         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 884                 if ((!newf) ^ (!old))
 885                         inet6_netconf_notify_devconf(net,
 886                                                      RTM_NEWNETCONF,
 887                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 888                                                      NETCONFA_IFINDEX_DEFAULT,
 889                                                      net->ipv6.devconf_dflt);
 890                 rtnl_unlock();
 891                 return 0;
 892         }
 893
 894         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 895                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 896                 addrconf_linkdown_change(net, newf);
 897                 if ((!newf) ^ (!old))
 898                         inet6_netconf_notify_devconf(net,
 899                                                      RTM_NEWNETCONF,
 900                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 901                                                      NETCONFA_IFINDEX_ALL,
 902                                                      net->ipv6.devconf_all);
 903         }
 904         rtnl_unlock();
 905
 906         return 1;
 907 }
 908
 909 #endif
 910
 911 /* Nobody refers to this ifaddr, destroy it */
 912 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 913 {
 914         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 915
 916 #ifdef NET_REFCNT_DEBUG
 917         pr_debug("%s\n", __func__);
 918 #endif
 919
 920         in6_dev_put(ifp->idev);
 921
 922         if (cancel_delayed_work(&ifp->dad_work))
 923                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 924                           ifp);
 925
 926         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 927                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 928                 return;
 929         }
 930         ip6_rt_put(ifp->rt);
 931
 932         kfree_rcu(ifp, rcu);
 933 }
 934
 935 static void
 936 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 937 {
 938         struct list_head *p;
 939         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 940
 941         /*
 942          * Each device address list is sorted in order of scope -
 943          * global before linklocal.
 944          */
 945         list_for_each(p, &idev->addr_list) {
 946                 struct inet6_ifaddr *ifa
 947                         = list_entry(p, struct inet6_ifaddr, if_list);
 948                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 949                         break;
 950         }
 951
 952         list_add_tail_rcu(&ifp->if_list, p);
 953 }
 954
 955 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
 956 {
 957         u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
 958
 959         return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
 960 }
 961
 962 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 963                                struct net_device *dev, unsigned int hash)
 964 {
 965         struct inet6_ifaddr *ifp;
 966
 967         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
 968                 if (!net_eq(dev_net(ifp->idev->dev), net))
 969                         continue;
 970                 if (ipv6_addr_equal(&ifp->addr, addr)) {
 971                         if (!dev || ifp->idev->dev == dev)
 972                                 return true;
 973                 }
 974         }
 975         return false;
 976 }
 977
 978 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
 979 {
 980         unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
 981         int err = 0;
 982
 983         spin_lock(&addrconf_hash_lock);
 984
 985         /* Ignore adding duplicate addresses on an interface */
 986         if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
 987                 ADBG("ipv6_add_addr: already assigned\n");
 988                 err = -EEXIST;
 989         } else {
 990                 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 991         }
 992
 993         spin_unlock(&addrconf_hash_lock);
 994
 995         return err;
 996 }
 997
 998 /* On success it returns ifp with increased reference count */
 999
1000 static struct inet6_ifaddr *
1001 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
1002               const struct in6_addr *peer_addr, int pfxlen,
1003               int scope, u32 flags, u32 valid_lft, u32 prefered_lft,
1004               bool can_block, struct netlink_ext_ack *extack)
1005 {
1006         gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1007         struct net *net = dev_net(idev->dev);
1008         struct inet6_ifaddr *ifa = NULL;
1009         struct rt6_info *rt = NULL;
1010         int err = 0;
1011         int addr_type = ipv6_addr_type(addr);
1012
1013         if (addr_type == IPV6_ADDR_ANY ||
1014             addr_type & IPV6_ADDR_MULTICAST ||
1015             (!(idev->dev->flags & IFF_LOOPBACK) &&
1016              addr_type & IPV6_ADDR_LOOPBACK))
1017                 return ERR_PTR(-EADDRNOTAVAIL);
1018
1019         if (idev->dead) {
1020                 err = -ENODEV;                  /*XXX*/
1021                 goto out;
1022         }
1023
1024         if (idev->cnf.disable_ipv6) {
1025                 err = -EACCES;
1026                 goto out;
1027         }
1028
1029         /* validator notifier needs to be blocking;
1030          * do not call in atomic context
1031          */
1032         if (can_block) {
1033                 struct in6_validator_info i6vi = {
1034                         .i6vi_addr = *addr,
1035                         .i6vi_dev = idev,
1036                         .extack = extack,
1037                 };
1038
1039                 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1040                 err = notifier_to_errno(err);
1041                 if (err < 0)
1042                         goto out;
1043         }
1044
1045         ifa = kzalloc(sizeof(*ifa), gfp_flags);
1046         if (!ifa) {
1047                 ADBG("ipv6_add_addr: malloc failed\n");
1048                 err = -ENOBUFS;
1049                 goto out;
1050         }
1051
1052         rt = addrconf_dst_alloc(idev, addr, false);
1053         if (IS_ERR(rt)) {
1054                 err = PTR_ERR(rt);
1055                 rt = NULL;
1056                 goto out;
1057         }
1058
1059         if (net->ipv6.devconf_all->disable_policy ||
1060             idev->cnf.disable_policy)
1061                 rt->dst.flags |= DST_NOPOLICY;
1062
1063         neigh_parms_data_state_setall(idev->nd_parms);
1064
1065         ifa->addr = *addr;
1066         if (peer_addr)
1067                 ifa->peer_addr = *peer_addr;
1068
1069         spin_lock_init(&ifa->lock);
1070         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1071         INIT_HLIST_NODE(&ifa->addr_lst);
1072         ifa->scope = scope;
1073         ifa->prefix_len = pfxlen;
1074         ifa->flags = flags;
1075         /* No need to add the TENTATIVE flag for addresses with NODAD */
1076         if (!(flags & IFA_F_NODAD))
1077                 ifa->flags |= IFA_F_TENTATIVE;
1078         ifa->valid_lft = valid_lft;
1079         ifa->prefered_lft = prefered_lft;
1080         ifa->cstamp = ifa->tstamp = jiffies;
1081         ifa->tokenized = false;
1082
1083         ifa->rt = rt;
1084
1085         ifa->idev = idev;
1086         in6_dev_hold(idev);
1087
1088         /* For caller */
1089         refcount_set(&ifa->refcnt, 1);
1090
1091         rcu_read_lock_bh();
1092
1093         err = ipv6_add_addr_hash(idev->dev, ifa);
1094         if (err < 0) {
1095                 rcu_read_unlock_bh();
1096                 goto out;
1097         }
1098
1099         write_lock(&idev->lock);
1100
1101         /* Add to inet6_dev unicast addr list. */
1102         ipv6_link_dev_addr(idev, ifa);
1103
1104         if (ifa->flags&IFA_F_TEMPORARY) {
1105                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1106                 in6_ifa_hold(ifa);
1107         }
1108
1109         in6_ifa_hold(ifa);
1110         write_unlock(&idev->lock);
1111
1112         rcu_read_unlock_bh();
1113
1114         inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1115 out:
1116         if (unlikely(err < 0)) {
1117                 if (rt)
1118                         ip6_rt_put(rt);
1119                 if (ifa) {
1120                         if (ifa->idev)
1121                                 in6_dev_put(ifa->idev);
1122                         kfree(ifa);
1123                 }
1124                 ifa = ERR_PTR(err);
1125         }
1126
1127         return ifa;
1128 }
1129
1130 enum cleanup_prefix_rt_t {
1131         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1132         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1133         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1134 };
1135
1136 /*
1137  * Check, whether the prefix for ifp would still need a prefix route
1138  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1139  * constants.
1140  *
1141  * 1) we don't purge prefix if address was not permanent.
1142  *    prefix is managed by its own lifetime.
1143  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1144  * 3) if there are no addresses, delete prefix.
1145  * 4) if there are still other permanent address(es),
1146  *    corresponding prefix is still permanent.
1147  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1148  *    don't purge the prefix, assume user space is managing it.
1149  * 6) otherwise, update prefix lifetime to the
1150  *    longest valid lifetime among the corresponding
1151  *    addresses on the device.
1152  *    Note: subsequent RA will update lifetime.
1153  **/
1154 static enum cleanup_prefix_rt_t
1155 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1156 {
1157         struct inet6_ifaddr *ifa;
1158         struct inet6_dev *idev = ifp->idev;
1159         unsigned long lifetime;
1160         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1161
1162         *expires = jiffies;
1163
1164         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1165                 if (ifa == ifp)
1166                         continue;
1167                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1168                                        ifp->prefix_len))
1169                         continue;
1170                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1171                         return CLEANUP_PREFIX_RT_NOP;
1172
1173                 action = CLEANUP_PREFIX_RT_EXPIRE;
1174
1175                 spin_lock(&ifa->lock);
1176
1177                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1178                 /*
1179                  * Note: Because this address is
1180                  * not permanent, lifetime <
1181                  * LONG_MAX / HZ here.
1182                  */
1183                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1184                         *expires = ifa->tstamp + lifetime * HZ;
1185                 spin_unlock(&ifa->lock);
1186         }
1187
1188         return action;
1189 }
1190
1191 static void
1192 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1193 {
1194         struct rt6_info *rt;
1195
1196         rt = addrconf_get_prefix_route(&ifp->addr,
1197                                        ifp->prefix_len,
1198                                        ifp->idev->dev,
1199                                        0, RTF_GATEWAY | RTF_DEFAULT);
1200         if (rt) {
1201                 if (del_rt)
1202                         ip6_del_rt(rt);
1203                 else {
1204                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1205                                 rt6_set_expires(rt, expires);
1206                         ip6_rt_put(rt);
1207                 }
1208         }
1209 }
1210
1211
1212 /* This function wants to get referenced ifp and releases it before return */
1213
1214 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1215 {
1216         int state;
1217         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1218         unsigned long expires;
1219
1220         ASSERT_RTNL();
1221
1222         spin_lock_bh(&ifp->lock);
1223         state = ifp->state;
1224         ifp->state = INET6_IFADDR_STATE_DEAD;
1225         spin_unlock_bh(&ifp->lock);
1226
1227         if (state == INET6_IFADDR_STATE_DEAD)
1228                 goto out;
1229
1230         spin_lock_bh(&addrconf_hash_lock);
1231         hlist_del_init_rcu(&ifp->addr_lst);
1232         spin_unlock_bh(&addrconf_hash_lock);
1233
1234         write_lock_bh(&ifp->idev->lock);
1235
1236         if (ifp->flags&IFA_F_TEMPORARY) {
1237                 list_del(&ifp->tmp_list);
1238                 if (ifp->ifpub) {
1239                         in6_ifa_put(ifp->ifpub);
1240                         ifp->ifpub = NULL;
1241                 }
1242                 __in6_ifa_put(ifp);
1243         }
1244
1245         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1246                 action = check_cleanup_prefix_route(ifp, &expires);
1247
1248         list_del_rcu(&ifp->if_list);
1249         __in6_ifa_put(ifp);
1250
1251         write_unlock_bh(&ifp->idev->lock);
1252
1253         addrconf_del_dad_work(ifp);
1254
1255         ipv6_ifa_notify(RTM_DELADDR, ifp);
1256
1257         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1258
1259         if (action != CLEANUP_PREFIX_RT_NOP) {
1260                 cleanup_prefix_route(ifp, expires,
1261                         action == CLEANUP_PREFIX_RT_DEL);
1262         }
1263
1264         /* clean up prefsrc entries */
1265         rt6_remove_prefsrc(ifp);
1266 out:
1267         in6_ifa_put(ifp);
1268 }
1269
1270 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1271                                 struct inet6_ifaddr *ift,
1272                                 bool block)
1273 {
1274         struct inet6_dev *idev = ifp->idev;
1275         struct in6_addr addr, *tmpaddr;
1276         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1277         unsigned long regen_advance;
1278         int tmp_plen;
1279         int ret = 0;
1280         u32 addr_flags;
1281         unsigned long now = jiffies;
1282         long max_desync_factor;
1283         s32 cnf_temp_preferred_lft;
1284
1285         write_lock_bh(&idev->lock);
1286         if (ift) {
1287                 spin_lock_bh(&ift->lock);
1288                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1289                 spin_unlock_bh(&ift->lock);
1290                 tmpaddr = &addr;
1291         } else {
1292                 tmpaddr = NULL;
1293         }
1294 retry:
1295         in6_dev_hold(idev);
1296         if (idev->cnf.use_tempaddr <= 0) {
1297                 write_unlock_bh(&idev->lock);
1298                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1299                 in6_dev_put(idev);
1300                 ret = -1;
1301                 goto out;
1302         }
1303         spin_lock_bh(&ifp->lock);
1304         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1305                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1306                 spin_unlock_bh(&ifp->lock);
1307                 write_unlock_bh(&idev->lock);
1308                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1309                         __func__);
1310                 in6_dev_put(idev);
1311                 ret = -1;
1312                 goto out;
1313         }
1314         in6_ifa_hold(ifp);
1315         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1316         ipv6_try_regen_rndid(idev, tmpaddr);
1317         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1318         age = (now - ifp->tstamp) / HZ;
1319
1320         regen_advance = idev->cnf.regen_max_retry *
1321                         idev->cnf.dad_transmits *
1322                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1323
1324         /* recalculate max_desync_factor each time and update
1325          * idev->desync_factor if it's larger
1326          */
1327         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1328         max_desync_factor = min_t(__u32,
1329                                   idev->cnf.max_desync_factor,
1330                                   cnf_temp_preferred_lft - regen_advance);
1331
1332         if (unlikely(idev->desync_factor > max_desync_factor)) {
1333                 if (max_desync_factor > 0) {
1334                         get_random_bytes(&idev->desync_factor,
1335                                          sizeof(idev->desync_factor));
1336                         idev->desync_factor %= max_desync_factor;
1337                 } else {
1338                         idev->desync_factor = 0;
1339                 }
1340         }
1341
1342         tmp_valid_lft = min_t(__u32,
1343                               ifp->valid_lft,
1344                               idev->cnf.temp_valid_lft + age);
1345         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1346                             idev->desync_factor;
1347         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1348         tmp_plen = ifp->prefix_len;
1349         tmp_tstamp = ifp->tstamp;
1350         spin_unlock_bh(&ifp->lock);
1351
1352         write_unlock_bh(&idev->lock);
1353
1354         /* A temporary address is created only if this calculated Preferred
1355          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1356          * an implementation must not create a temporary address with a zero
1357          * Preferred Lifetime.
1358          * Use age calculation as in addrconf_verify to avoid unnecessary
1359          * temporary addresses being generated.
1360          */
1361         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1362         if (tmp_prefered_lft <= regen_advance + age) {
1363                 in6_ifa_put(ifp);
1364                 in6_dev_put(idev);
1365                 ret = -1;
1366                 goto out;
1367         }
1368
1369         addr_flags = IFA_F_TEMPORARY;
1370         /* set in addrconf_prefix_rcv() */
1371         if (ifp->flags & IFA_F_OPTIMISTIC)
1372                 addr_flags |= IFA_F_OPTIMISTIC;
1373
1374         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1375                             ipv6_addr_scope(&addr), addr_flags,
1376                             tmp_valid_lft, tmp_prefered_lft, block, NULL);
1377         if (IS_ERR(ift)) {
1378                 in6_ifa_put(ifp);
1379                 in6_dev_put(idev);
1380                 pr_info("%s: retry temporary address regeneration\n", __func__);
1381                 tmpaddr = &addr;
1382                 write_lock_bh(&idev->lock);
1383                 goto retry;
1384         }
1385
1386         spin_lock_bh(&ift->lock);
1387         ift->ifpub = ifp;
1388         ift->cstamp = now;
1389         ift->tstamp = tmp_tstamp;
1390         spin_unlock_bh(&ift->lock);
1391
1392         addrconf_dad_start(ift);
1393         in6_ifa_put(ift);
1394         in6_dev_put(idev);
1395 out:
1396         return ret;
1397 }
1398
1399 /*
1400  *      Choose an appropriate source address (RFC3484)
1401  */
1402 enum {
1403         IPV6_SADDR_RULE_INIT = 0,
1404         IPV6_SADDR_RULE_LOCAL,
1405         IPV6_SADDR_RULE_SCOPE,
1406         IPV6_SADDR_RULE_PREFERRED,
1407 #ifdef CONFIG_IPV6_MIP6
1408         IPV6_SADDR_RULE_HOA,
1409 #endif
1410         IPV6_SADDR_RULE_OIF,
1411         IPV6_SADDR_RULE_LABEL,
1412         IPV6_SADDR_RULE_PRIVACY,
1413         IPV6_SADDR_RULE_ORCHID,
1414         IPV6_SADDR_RULE_PREFIX,
1415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1416         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1417 #endif
1418         IPV6_SADDR_RULE_MAX
1419 };
1420
1421 struct ipv6_saddr_score {
1422         int                     rule;
1423         int                     addr_type;
1424         struct inet6_ifaddr     *ifa;
1425         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1426         int                     scopedist;
1427         int                     matchlen;
1428 };
1429
1430 struct ipv6_saddr_dst {
1431         const struct in6_addr *addr;
1432         int ifindex;
1433         int scope;
1434         int label;
1435         unsigned int prefs;
1436 };
1437
1438 static inline int ipv6_saddr_preferred(int type)
1439 {
1440         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1441                 return 1;
1442         return 0;
1443 }
1444
1445 static bool ipv6_use_optimistic_addr(struct net *net,
1446                                      struct inet6_dev *idev)
1447 {
1448 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1449         if (!idev)
1450                 return false;
1451         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1452                 return false;
1453         if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1454                 return false;
1455
1456         return true;
1457 #else
1458         return false;
1459 #endif
1460 }
1461
1462 static int ipv6_get_saddr_eval(struct net *net,
1463                                struct ipv6_saddr_score *score,
1464                                struct ipv6_saddr_dst *dst,
1465                                int i)
1466 {
1467         int ret;
1468
1469         if (i <= score->rule) {
1470                 switch (i) {
1471                 case IPV6_SADDR_RULE_SCOPE:
1472                         ret = score->scopedist;
1473                         break;
1474                 case IPV6_SADDR_RULE_PREFIX:
1475                         ret = score->matchlen;
1476                         break;
1477                 default:
1478                         ret = !!test_bit(i, score->scorebits);
1479                 }
1480                 goto out;
1481         }
1482
1483         switch (i) {
1484         case IPV6_SADDR_RULE_INIT:
1485                 /* Rule 0: remember if hiscore is not ready yet */
1486                 ret = !!score->ifa;
1487                 break;
1488         case IPV6_SADDR_RULE_LOCAL:
1489                 /* Rule 1: Prefer same address */
1490                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1491                 break;
1492         case IPV6_SADDR_RULE_SCOPE:
1493                 /* Rule 2: Prefer appropriate scope
1494                  *
1495                  *      ret
1496                  *       ^
1497                  *    -1 |  d 15
1498                  *    ---+--+-+---> scope
1499                  *       |
1500                  *       |             d is scope of the destination.
1501                  *  B-d  |  \
1502                  *       |   \      <- smaller scope is better if
1503                  *  B-15 |    \        if scope is enough for destination.
1504                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1505                  * d-C-1 | /
1506                  *       |/         <- greater is better
1507                  *   -C  /             if scope is not enough for destination.
1508                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1509                  *
1510                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1511                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1512                  * Assume B = 0 and we get C > 29.
1513                  */
1514                 ret = __ipv6_addr_src_scope(score->addr_type);
1515                 if (ret >= dst->scope)
1516                         ret = -ret;
1517                 else
1518                         ret -= 128;     /* 30 is enough */
1519                 score->scopedist = ret;
1520                 break;
1521         case IPV6_SADDR_RULE_PREFERRED:
1522             {
1523                 /* Rule 3: Avoid deprecated and optimistic addresses */
1524                 u8 avoid = IFA_F_DEPRECATED;
1525
1526                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1527                         avoid |= IFA_F_OPTIMISTIC;
1528                 ret = ipv6_saddr_preferred(score->addr_type) ||
1529                       !(score->ifa->flags & avoid);
1530                 break;
1531             }
1532 #ifdef CONFIG_IPV6_MIP6
1533         case IPV6_SADDR_RULE_HOA:
1534             {
1535                 /* Rule 4: Prefer home address */
1536                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1537                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1538                 break;
1539             }
1540 #endif
1541         case IPV6_SADDR_RULE_OIF:
1542                 /* Rule 5: Prefer outgoing interface */
1543                 ret = (!dst->ifindex ||
1544                        dst->ifindex == score->ifa->idev->dev->ifindex);
1545                 break;
1546         case IPV6_SADDR_RULE_LABEL:
1547                 /* Rule 6: Prefer matching label */
1548                 ret = ipv6_addr_label(net,
1549                                       &score->ifa->addr, score->addr_type,
1550                                       score->ifa->idev->dev->ifindex) == dst->label;
1551                 break;
1552         case IPV6_SADDR_RULE_PRIVACY:
1553             {
1554                 /* Rule 7: Prefer public address
1555                  * Note: prefer temporary address if use_tempaddr >= 2
1556                  */
1557                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1558                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1559                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1560                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1561                 break;
1562             }
1563         case IPV6_SADDR_RULE_ORCHID:
1564                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1565                  *          non-ORCHID vs non-ORCHID
1566                  */
1567                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1568                         ipv6_addr_orchid(dst->addr));
1569                 break;
1570         case IPV6_SADDR_RULE_PREFIX:
1571                 /* Rule 8: Use longest matching prefix */
1572                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1573                 if (ret > score->ifa->prefix_len)
1574                         ret = score->ifa->prefix_len;
1575                 score->matchlen = ret;
1576                 break;
1577 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1578         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1579                 /* Optimistic addresses still have lower precedence than other
1580                  * preferred addresses.
1581                  */
1582                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1583                 break;
1584 #endif
1585         default:
1586                 ret = 0;
1587         }
1588
1589         if (ret)
1590                 __set_bit(i, score->scorebits);
1591         score->rule = i;
1592 out:
1593         return ret;
1594 }
1595
1596 static int __ipv6_dev_get_saddr(struct net *net,
1597                                 struct ipv6_saddr_dst *dst,
1598                                 struct inet6_dev *idev,
1599                                 struct ipv6_saddr_score *scores,
1600                                 int hiscore_idx)
1601 {
1602         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1603
1604         list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1605                 int i;
1606
1607                 /*
1608                  * - Tentative Address (RFC2462 section 5.4)
1609                  *  - A tentative address is not considered
1610                  *    "assigned to an interface" in the traditional
1611                  *    sense, unless it is also flagged as optimistic.
1612                  * - Candidate Source Address (section 4)
1613                  *  - In any case, anycast addresses, multicast
1614                  *    addresses, and the unspecified address MUST
1615                  *    NOT be included in a candidate set.
1616                  */
1617                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1618                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1619                         continue;
1620
1621                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1622
1623                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1624                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1625                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1626                                             idev->dev->name);
1627                         continue;
1628                 }
1629
1630                 score->rule = -1;
1631                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1632
1633                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1634                         int minihiscore, miniscore;
1635
1636                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1637                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1638
1639                         if (minihiscore > miniscore) {
1640                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1641                                     score->scopedist > 0) {
1642                                         /*
1643                                          * special case:
1644                                          * each remaining entry
1645                                          * has too small (not enough)
1646                                          * scope, because ifa entries
1647                                          * are sorted by their scope
1648                                          * values.
1649                                          */
1650                                         goto out;
1651                                 }
1652                                 break;
1653                         } else if (minihiscore < miniscore) {
1654                                 swap(hiscore, score);
1655                                 hiscore_idx = 1 - hiscore_idx;
1656
1657                                 /* restore our iterator */
1658                                 score->ifa = hiscore->ifa;
1659
1660                                 break;
1661                         }
1662                 }
1663         }
1664 out:
1665         return hiscore_idx;
1666 }
1667
1668 static int ipv6_get_saddr_master(struct net *net,
1669                                  const struct net_device *dst_dev,
1670                                  const struct net_device *master,
1671                                  struct ipv6_saddr_dst *dst,
1672                                  struct ipv6_saddr_score *scores,
1673                                  int hiscore_idx)
1674 {
1675         struct inet6_dev *idev;
1676
1677         idev = __in6_dev_get(dst_dev);
1678         if (idev)
1679                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1680                                                    scores, hiscore_idx);
1681
1682         idev = __in6_dev_get(master);
1683         if (idev)
1684                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1685                                                    scores, hiscore_idx);
1686
1687         return hiscore_idx;
1688 }
1689
1690 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1691                        const struct in6_addr *daddr, unsigned int prefs,
1692                        struct in6_addr *saddr)
1693 {
1694         struct ipv6_saddr_score scores[2], *hiscore;
1695         struct ipv6_saddr_dst dst;
1696         struct inet6_dev *idev;
1697         struct net_device *dev;
1698         int dst_type;
1699         bool use_oif_addr = false;
1700         int hiscore_idx = 0;
1701         int ret = 0;
1702
1703         dst_type = __ipv6_addr_type(daddr);
1704         dst.addr = daddr;
1705         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1706         dst.scope = __ipv6_addr_src_scope(dst_type);
1707         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1708         dst.prefs = prefs;
1709
1710         scores[hiscore_idx].rule = -1;
1711         scores[hiscore_idx].ifa = NULL;
1712
1713         rcu_read_lock();
1714
1715         /* Candidate Source Address (section 4)
1716          *  - multicast and link-local destination address,
1717          *    the set of candidate source address MUST only
1718          *    include addresses assigned to interfaces
1719          *    belonging to the same link as the outgoing
1720          *    interface.
1721          * (- For site-local destination addresses, the
1722          *    set of candidate source addresses MUST only
1723          *    include addresses assigned to interfaces
1724          *    belonging to the same site as the outgoing
1725          *    interface.)
1726          *  - "It is RECOMMENDED that the candidate source addresses
1727          *    be the set of unicast addresses assigned to the
1728          *    interface that will be used to send to the destination
1729          *    (the 'outgoing' interface)." (RFC 6724)
1730          */
1731         if (dst_dev) {
1732                 idev = __in6_dev_get(dst_dev);
1733                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1734                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1735                     (idev && idev->cnf.use_oif_addrs_only)) {
1736                         use_oif_addr = true;
1737                 }
1738         }
1739
1740         if (use_oif_addr) {
1741                 if (idev)
1742                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1743         } else {
1744                 const struct net_device *master;
1745                 int master_idx = 0;
1746
1747                 /* if dst_dev exists and is enslaved to an L3 device, then
1748                  * prefer addresses from dst_dev and then the master over
1749                  * any other enslaved devices in the L3 domain.
1750                  */
1751                 master = l3mdev_master_dev_rcu(dst_dev);
1752                 if (master) {
1753                         master_idx = master->ifindex;
1754
1755                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1756                                                             master, &dst,
1757                                                             scores, hiscore_idx);
1758
1759                         if (scores[hiscore_idx].ifa)
1760                                 goto out;
1761                 }
1762
1763                 for_each_netdev_rcu(net, dev) {
1764                         /* only consider addresses on devices in the
1765                          * same L3 domain
1766                          */
1767                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1768                                 continue;
1769                         idev = __in6_dev_get(dev);
1770                         if (!idev)
1771                                 continue;
1772                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1773                 }
1774         }
1775
1776 out:
1777         hiscore = &scores[hiscore_idx];
1778         if (!hiscore->ifa)
1779                 ret = -EADDRNOTAVAIL;
1780         else
1781                 *saddr = hiscore->ifa->addr;
1782
1783         rcu_read_unlock();
1784         return ret;
1785 }
1786 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1787
1788 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1789                       u32 banned_flags)
1790 {
1791         struct inet6_ifaddr *ifp;
1792         int err = -EADDRNOTAVAIL;
1793
1794         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1795                 if (ifp->scope > IFA_LINK)
1796                         break;
1797                 if (ifp->scope == IFA_LINK &&
1798                     !(ifp->flags & banned_flags)) {
1799                         *addr = ifp->addr;
1800                         err = 0;
1801                         break;
1802                 }
1803         }
1804         return err;
1805 }
1806
1807 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1808                     u32 banned_flags)
1809 {
1810         struct inet6_dev *idev;
1811         int err = -EADDRNOTAVAIL;
1812
1813         rcu_read_lock();
1814         idev = __in6_dev_get(dev);
1815         if (idev) {
1816                 read_lock_bh(&idev->lock);
1817                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1818                 read_unlock_bh(&idev->lock);
1819         }
1820         rcu_read_unlock();
1821         return err;
1822 }
1823
1824 static int ipv6_count_addresses(const struct inet6_dev *idev)
1825 {
1826         const struct inet6_ifaddr *ifp;
1827         int cnt = 0;
1828
1829         rcu_read_lock();
1830         list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1831                 cnt++;
1832         rcu_read_unlock();
1833         return cnt;
1834 }
1835
1836 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1837                   const struct net_device *dev, int strict)
1838 {
1839         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1840 }
1841 EXPORT_SYMBOL(ipv6_chk_addr);
1842
1843 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1844                             const struct net_device *dev, int strict,
1845                             u32 banned_flags)
1846 {
1847         unsigned int hash = inet6_addr_hash(net, addr);
1848         struct inet6_ifaddr *ifp;
1849         u32 ifp_flags;
1850
1851         rcu_read_lock();
1852         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1853                 if (!net_eq(dev_net(ifp->idev->dev), net))
1854                         continue;
1855                 /* Decouple optimistic from tentative for evaluation here.
1856                  * Ban optimistic addresses explicitly, when required.
1857                  */
1858                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1859                             ? (ifp->flags&~IFA_F_TENTATIVE)
1860                             : ifp->flags;
1861                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1862                     !(ifp_flags&banned_flags) &&
1863                     (!dev || ifp->idev->dev == dev ||
1864                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1865                         rcu_read_unlock();
1866                         return 1;
1867                 }
1868         }
1869
1870         rcu_read_unlock();
1871         return 0;
1872 }
1873 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1874
1875
1876 /* Compares an address/prefix_len with addresses on device @dev.
1877  * If one is found it returns true.
1878  */
1879 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1880         const unsigned int prefix_len, struct net_device *dev)
1881 {
1882         const struct inet6_ifaddr *ifa;
1883         const struct inet6_dev *idev;
1884         bool ret = false;
1885
1886         rcu_read_lock();
1887         idev = __in6_dev_get(dev);
1888         if (idev) {
1889                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1890                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1891                         if (ret)
1892                                 break;
1893                 }
1894         }
1895         rcu_read_unlock();
1896
1897         return ret;
1898 }
1899 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1900
1901 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1902 {
1903         const struct inet6_ifaddr *ifa;
1904         const struct inet6_dev *idev;
1905         int     onlink;
1906
1907         onlink = 0;
1908         rcu_read_lock();
1909         idev = __in6_dev_get(dev);
1910         if (idev) {
1911                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1912                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1913                                                    ifa->prefix_len);
1914                         if (onlink)
1915                                 break;
1916                 }
1917         }
1918         rcu_read_unlock();
1919         return onlink;
1920 }
1921 EXPORT_SYMBOL(ipv6_chk_prefix);
1922
1923 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1924                                      struct net_device *dev, int strict)
1925 {
1926         unsigned int hash = inet6_addr_hash(net, addr);
1927         struct inet6_ifaddr *ifp, *result = NULL;
1928
1929         rcu_read_lock();
1930         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1931                 if (!net_eq(dev_net(ifp->idev->dev), net))
1932                         continue;
1933                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1934                         if (!dev || ifp->idev->dev == dev ||
1935                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1936                                 result = ifp;
1937                                 in6_ifa_hold(ifp);
1938                                 break;
1939                         }
1940                 }
1941         }
1942         rcu_read_unlock();
1943
1944         return result;
1945 }
1946
1947 /* Gets referenced address, destroys ifaddr */
1948
1949 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1950 {
1951         if (dad_failed)
1952                 ifp->flags |= IFA_F_DADFAILED;
1953
1954         if (ifp->flags&IFA_F_TEMPORARY) {
1955                 struct inet6_ifaddr *ifpub;
1956                 spin_lock_bh(&ifp->lock);
1957                 ifpub = ifp->ifpub;
1958                 if (ifpub) {
1959                         in6_ifa_hold(ifpub);
1960                         spin_unlock_bh(&ifp->lock);
1961                         ipv6_create_tempaddr(ifpub, ifp, true);
1962                         in6_ifa_put(ifpub);
1963                 } else {
1964                         spin_unlock_bh(&ifp->lock);
1965                 }
1966                 ipv6_del_addr(ifp);
1967         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1968                 spin_lock_bh(&ifp->lock);
1969                 addrconf_del_dad_work(ifp);
1970                 ifp->flags |= IFA_F_TENTATIVE;
1971                 spin_unlock_bh(&ifp->lock);
1972                 if (dad_failed)
1973                         ipv6_ifa_notify(0, ifp);
1974                 in6_ifa_put(ifp);
1975         } else {
1976                 ipv6_del_addr(ifp);
1977         }
1978 }
1979
1980 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1981 {
1982         int err = -ENOENT;
1983
1984         spin_lock_bh(&ifp->lock);
1985         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1986                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1987                 err = 0;
1988         }
1989         spin_unlock_bh(&ifp->lock);
1990
1991         return err;
1992 }
1993
1994 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
1995 {
1996         struct inet6_dev *idev = ifp->idev;
1997         struct net *net = dev_net(ifp->idev->dev);
1998
1999         if (addrconf_dad_end(ifp)) {
2000                 in6_ifa_put(ifp);
2001                 return;
2002         }
2003
2004         net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2005                              ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2006
2007         spin_lock_bh(&ifp->lock);
2008
2009         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2010                 int scope = ifp->scope;
2011                 u32 flags = ifp->flags;
2012                 struct in6_addr new_addr;
2013                 struct inet6_ifaddr *ifp2;
2014                 u32 valid_lft, preferred_lft;
2015                 int pfxlen = ifp->prefix_len;
2016                 int retries = ifp->stable_privacy_retry + 1;
2017
2018                 if (retries > net->ipv6.sysctl.idgen_retries) {
2019                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2020                                              ifp->idev->dev->name);
2021                         goto errdad;
2022                 }
2023
2024                 new_addr = ifp->addr;
2025                 if (ipv6_generate_stable_address(&new_addr, retries,
2026                                                  idev))
2027                         goto errdad;
2028
2029                 valid_lft = ifp->valid_lft;
2030                 preferred_lft = ifp->prefered_lft;
2031
2032                 spin_unlock_bh(&ifp->lock);
2033
2034                 if (idev->cnf.max_addresses &&
2035                     ipv6_count_addresses(idev) >=
2036                     idev->cnf.max_addresses)
2037                         goto lock_errdad;
2038
2039                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2040                                      ifp->idev->dev->name);
2041
2042                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2043                                      scope, flags, valid_lft,
2044                                      preferred_lft, false, NULL);
2045                 if (IS_ERR(ifp2))
2046                         goto lock_errdad;
2047
2048                 spin_lock_bh(&ifp2->lock);
2049                 ifp2->stable_privacy_retry = retries;
2050                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2051                 spin_unlock_bh(&ifp2->lock);
2052
2053                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2054                 in6_ifa_put(ifp2);
2055 lock_errdad:
2056                 spin_lock_bh(&ifp->lock);
2057         }
2058
2059 errdad:
2060         /* transition from _POSTDAD to _ERRDAD */
2061         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2062         spin_unlock_bh(&ifp->lock);
2063
2064         addrconf_mod_dad_work(ifp, 0);
2065         in6_ifa_put(ifp);
2066 }
2067
2068 /* Join to solicited addr multicast group.
2069  * caller must hold RTNL */
2070 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2071 {
2072         struct in6_addr maddr;
2073
2074         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2075                 return;
2076
2077         addrconf_addr_solict_mult(addr, &maddr);
2078         ipv6_dev_mc_inc(dev, &maddr);
2079 }
2080
2081 /* caller must hold RTNL */
2082 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2083 {
2084         struct in6_addr maddr;
2085
2086         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2087                 return;
2088
2089         addrconf_addr_solict_mult(addr, &maddr);
2090         __ipv6_dev_mc_dec(idev, &maddr);
2091 }
2092
2093 /* caller must hold RTNL */
2094 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2095 {
2096         struct in6_addr addr;
2097
2098         if (ifp->prefix_len >= 127) /* RFC 6164 */
2099                 return;
2100         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2101         if (ipv6_addr_any(&addr))
2102                 return;
2103         __ipv6_dev_ac_inc(ifp->idev, &addr);
2104 }
2105
2106 /* caller must hold RTNL */
2107 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2108 {
2109         struct in6_addr addr;
2110
2111         if (ifp->prefix_len >= 127) /* RFC 6164 */
2112                 return;
2113         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2114         if (ipv6_addr_any(&addr))
2115                 return;
2116         __ipv6_dev_ac_dec(ifp->idev, &addr);
2117 }
2118
2119 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2120 {
2121         switch (dev->addr_len) {
2122         case ETH_ALEN:
2123                 memcpy(eui, dev->dev_addr, 3);
2124                 eui[3] = 0xFF;
2125                 eui[4] = 0xFE;
2126                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2127                 break;
2128         case EUI64_ADDR_LEN:
2129                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2130                 eui[0] ^= 2;
2131                 break;
2132         default:
2133                 return -1;
2134         }
2135
2136         return 0;
2137 }
2138
2139 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2140 {
2141         union fwnet_hwaddr *ha;
2142
2143         if (dev->addr_len != FWNET_ALEN)
2144                 return -1;
2145
2146         ha = (union fwnet_hwaddr *)dev->dev_addr;
2147
2148         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2149         eui[0] ^= 2;
2150         return 0;
2151 }
2152
2153 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2154 {
2155         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2156         if (dev->addr_len != ARCNET_ALEN)
2157                 return -1;
2158         memset(eui, 0, 7);
2159         eui[7] = *(u8 *)dev->dev_addr;
2160         return 0;
2161 }
2162
2163 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2164 {
2165         if (dev->addr_len != INFINIBAND_ALEN)
2166                 return -1;
2167         memcpy(eui, dev->dev_addr + 12, 8);
2168         eui[0] |= 2;
2169         return 0;
2170 }
2171
2172 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2173 {
2174         if (addr == 0)
2175                 return -1;
2176         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2177                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2178                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2179                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2180                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2181                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2182         eui[1] = 0;
2183         eui[2] = 0x5E;
2184         eui[3] = 0xFE;
2185         memcpy(eui + 4, &addr, 4);
2186         return 0;
2187 }
2188
2189 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2190 {
2191         if (dev->priv_flags & IFF_ISATAP)
2192                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2193         return -1;
2194 }
2195
2196 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2197 {
2198         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2199 }
2200
2201 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2202 {
2203         memcpy(eui, dev->perm_addr, 3);
2204         memcpy(eui + 5, dev->perm_addr + 3, 3);
2205         eui[3] = 0xFF;
2206         eui[4] = 0xFE;
2207         eui[0] ^= 2;
2208         return 0;
2209 }
2210
2211 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2212 {
2213         switch (dev->type) {
2214         case ARPHRD_ETHER:
2215         case ARPHRD_FDDI:
2216                 return addrconf_ifid_eui48(eui, dev);
2217         case ARPHRD_ARCNET:
2218                 return addrconf_ifid_arcnet(eui, dev);
2219         case ARPHRD_INFINIBAND:
2220                 return addrconf_ifid_infiniband(eui, dev);
2221         case ARPHRD_SIT:
2222                 return addrconf_ifid_sit(eui, dev);
2223         case ARPHRD_IPGRE:
2224         case ARPHRD_TUNNEL:
2225                 return addrconf_ifid_gre(eui, dev);
2226         case ARPHRD_6LOWPAN:
2227                 return addrconf_ifid_6lowpan(eui, dev);
2228         case ARPHRD_IEEE1394:
2229                 return addrconf_ifid_ieee1394(eui, dev);
2230         case ARPHRD_TUNNEL6:
2231         case ARPHRD_IP6GRE:
2232                 return addrconf_ifid_ip6tnl(eui, dev);
2233         }
2234         return -1;
2235 }
2236
2237 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2238 {
2239         int err = -1;
2240         struct inet6_ifaddr *ifp;
2241
2242         read_lock_bh(&idev->lock);
2243         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2244                 if (ifp->scope > IFA_LINK)
2245                         break;
2246                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2247                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2248                         err = 0;
2249                         break;
2250                 }
2251         }
2252         read_unlock_bh(&idev->lock);
2253         return err;
2254 }
2255
2256 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2257 static void ipv6_regen_rndid(struct inet6_dev *idev)
2258 {
2259 regen:
2260         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2261         idev->rndid[0] &= ~0x02;
2262
2263         /*
2264          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2265          * check if generated address is not inappropriate
2266          *
2267          *  - Reserved subnet anycast (RFC 2526)
2268          *      11111101 11....11 1xxxxxxx
2269          *  - ISATAP (RFC4214) 6.1
2270          *      00-00-5E-FE-xx-xx-xx-xx
2271          *  - value 0
2272          *  - XXX: already assigned to an address on the device
2273          */
2274         if (idev->rndid[0] == 0xfd &&
2275             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2276             (idev->rndid[7]&0x80))
2277                 goto regen;
2278         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2279                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2280                         goto regen;
2281                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2282                         goto regen;
2283         }
2284 }
2285
2286 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2287 {
2288         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2289                 ipv6_regen_rndid(idev);
2290 }
2291
2292 /*
2293  *      Add prefix route.
2294  */
2295
2296 static void
2297 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2298                       unsigned long expires, u32 flags)
2299 {
2300         struct fib6_config cfg = {
2301                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2302                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2303                 .fc_ifindex = dev->ifindex,
2304                 .fc_expires = expires,
2305                 .fc_dst_len = plen,
2306                 .fc_flags = RTF_UP | flags,
2307                 .fc_nlinfo.nl_net = dev_net(dev),
2308                 .fc_protocol = RTPROT_KERNEL,
2309         };
2310
2311         cfg.fc_dst = *pfx;
2312
2313         /* Prevent useless cloning on PtP SIT.
2314            This thing is done here expecting that the whole
2315            class of non-broadcast devices need not cloning.
2316          */
2317 #if IS_ENABLED(CONFIG_IPV6_SIT)
2318         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2319                 cfg.fc_flags |= RTF_NONEXTHOP;
2320 #endif
2321
2322         ip6_route_add(&cfg, NULL);
2323 }
2324
2325
2326 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2327                                                   int plen,
2328                                                   const struct net_device *dev,
2329                                                   u32 flags, u32 noflags)
2330 {
2331         struct fib6_node *fn;
2332         struct rt6_info *rt = NULL;
2333         struct fib6_table *table;
2334         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2335
2336         table = fib6_get_table(dev_net(dev), tb_id);
2337         if (!table)
2338                 return NULL;
2339
2340         rcu_read_lock();
2341         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2342         if (!fn)
2343                 goto out;
2344
2345         for_each_fib6_node_rt_rcu(fn) {
2346                 if (rt->dst.dev->ifindex != dev->ifindex)
2347                         continue;
2348                 if ((rt->rt6i_flags & flags) != flags)
2349                         continue;
2350                 if ((rt->rt6i_flags & noflags) != 0)
2351                         continue;
2352                 if (!dst_hold_safe(&rt->dst))
2353                         rt = NULL;
2354                 break;
2355         }
2356 out:
2357         rcu_read_unlock();
2358         return rt;
2359 }
2360
2361
2362 /* Create "default" multicast route to the interface */
2363
2364 static void addrconf_add_mroute(struct net_device *dev)
2365 {
2366         struct fib6_config cfg = {
2367                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2368                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2369                 .fc_ifindex = dev->ifindex,
2370                 .fc_dst_len = 8,
2371                 .fc_flags = RTF_UP,
2372                 .fc_nlinfo.nl_net = dev_net(dev),
2373         };
2374
2375         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2376
2377         ip6_route_add(&cfg, NULL);
2378 }
2379
2380 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2381 {
2382         struct inet6_dev *idev;
2383
2384         ASSERT_RTNL();
2385
2386         idev = ipv6_find_idev(dev);
2387         if (!idev)
2388                 return ERR_PTR(-ENOBUFS);
2389
2390         if (idev->cnf.disable_ipv6)
2391                 return ERR_PTR(-EACCES);
2392
2393         /* Add default multicast route */
2394         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2395                 addrconf_add_mroute(dev);
2396
2397         return idev;
2398 }
2399
2400 static void manage_tempaddrs(struct inet6_dev *idev,
2401                              struct inet6_ifaddr *ifp,
2402                              __u32 valid_lft, __u32 prefered_lft,
2403                              bool create, unsigned long now)
2404 {
2405         u32 flags;
2406         struct inet6_ifaddr *ift;
2407
2408         read_lock_bh(&idev->lock);
2409         /* update all temporary addresses in the list */
2410         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2411                 int age, max_valid, max_prefered;
2412
2413                 if (ifp != ift->ifpub)
2414                         continue;
2415
2416                 /* RFC 4941 section 3.3:
2417                  * If a received option will extend the lifetime of a public
2418                  * address, the lifetimes of temporary addresses should
2419                  * be extended, subject to the overall constraint that no
2420                  * temporary addresses should ever remain "valid" or "preferred"
2421                  * for a time longer than (TEMP_VALID_LIFETIME) or
2422                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2423                  */
2424                 age = (now - ift->cstamp) / HZ;
2425                 max_valid = idev->cnf.temp_valid_lft - age;
2426                 if (max_valid < 0)
2427                         max_valid = 0;
2428
2429                 max_prefered = idev->cnf.temp_prefered_lft -
2430                                idev->desync_factor - age;
2431                 if (max_prefered < 0)
2432                         max_prefered = 0;
2433
2434                 if (valid_lft > max_valid)
2435                         valid_lft = max_valid;
2436
2437                 if (prefered_lft > max_prefered)
2438                         prefered_lft = max_prefered;
2439
2440                 spin_lock(&ift->lock);
2441                 flags = ift->flags;
2442                 ift->valid_lft = valid_lft;
2443                 ift->prefered_lft = prefered_lft;
2444                 ift->tstamp = now;
2445                 if (prefered_lft > 0)
2446                         ift->flags &= ~IFA_F_DEPRECATED;
2447
2448                 spin_unlock(&ift->lock);
2449                 if (!(flags&IFA_F_TENTATIVE))
2450                         ipv6_ifa_notify(0, ift);
2451         }
2452
2453         if ((create || list_empty(&idev->tempaddr_list)) &&
2454             idev->cnf.use_tempaddr > 0) {
2455                 /* When a new public address is created as described
2456                  * in [ADDRCONF], also create a new temporary address.
2457                  * Also create a temporary address if it's enabled but
2458                  * no temporary address currently exists.
2459                  */
2460                 read_unlock_bh(&idev->lock);
2461                 ipv6_create_tempaddr(ifp, NULL, false);
2462         } else {
2463                 read_unlock_bh(&idev->lock);
2464         }
2465 }
2466
2467 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2468 {
2469         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2470                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2471 }
2472
2473 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2474                                  const struct prefix_info *pinfo,
2475                                  struct inet6_dev *in6_dev,
2476                                  const struct in6_addr *addr, int addr_type,
2477                                  u32 addr_flags, bool sllao, bool tokenized,
2478                                  __u32 valid_lft, u32 prefered_lft)
2479 {
2480         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2481         int create = 0, update_lft = 0;
2482
2483         if (!ifp && valid_lft) {
2484                 int max_addresses = in6_dev->cnf.max_addresses;
2485
2486 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2487                 if ((net->ipv6.devconf_all->optimistic_dad ||
2488                      in6_dev->cnf.optimistic_dad) &&
2489                     !net->ipv6.devconf_all->forwarding && sllao)
2490                         addr_flags |= IFA_F_OPTIMISTIC;
2491 #endif
2492
2493                 /* Do not allow to create too much of autoconfigured
2494                  * addresses; this would be too easy way to crash kernel.
2495                  */
2496                 if (!max_addresses ||
2497                     ipv6_count_addresses(in6_dev) < max_addresses)
2498                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2499                                             pinfo->prefix_len,
2500                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2501                                             addr_flags, valid_lft,
2502                                             prefered_lft, false, NULL);
2503
2504                 if (IS_ERR_OR_NULL(ifp))
2505                         return -1;
2506
2507                 update_lft = 0;
2508                 create = 1;
2509                 spin_lock_bh(&ifp->lock);
2510                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2511                 ifp->cstamp = jiffies;
2512                 ifp->tokenized = tokenized;
2513                 spin_unlock_bh(&ifp->lock);
2514                 addrconf_dad_start(ifp);
2515         }
2516
2517         if (ifp) {
2518                 u32 flags;
2519                 unsigned long now;
2520                 u32 stored_lft;
2521
2522                 /* update lifetime (RFC2462 5.5.3 e) */
2523                 spin_lock_bh(&ifp->lock);
2524                 now = jiffies;
2525                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2526                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2527                 else
2528                         stored_lft = 0;
2529                 if (!update_lft && !create && stored_lft) {
2530                         const u32 minimum_lft = min_t(u32,
2531                                 stored_lft, MIN_VALID_LIFETIME);
2532                         valid_lft = max(valid_lft, minimum_lft);
2533
2534                         /* RFC4862 Section 5.5.3e:
2535                          * "Note that the preferred lifetime of the
2536                          *  corresponding address is always reset to
2537                          *  the Preferred Lifetime in the received
2538                          *  Prefix Information option, regardless of
2539                          *  whether the valid lifetime is also reset or
2540                          *  ignored."
2541                          *
2542                          * So we should always update prefered_lft here.
2543                          */
2544                         update_lft = 1;
2545                 }
2546
2547                 if (update_lft) {
2548                         ifp->valid_lft = valid_lft;
2549                         ifp->prefered_lft = prefered_lft;
2550                         ifp->tstamp = now;
2551                         flags = ifp->flags;
2552                         ifp->flags &= ~IFA_F_DEPRECATED;
2553                         spin_unlock_bh(&ifp->lock);
2554
2555                         if (!(flags&IFA_F_TENTATIVE))
2556                                 ipv6_ifa_notify(0, ifp);
2557                 } else
2558                         spin_unlock_bh(&ifp->lock);
2559
2560                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2561                                  create, now);
2562
2563                 in6_ifa_put(ifp);
2564                 addrconf_verify();
2565         }
2566
2567         return 0;
2568 }
2569 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2570
2571 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2572 {
2573         struct prefix_info *pinfo;
2574         __u32 valid_lft;
2575         __u32 prefered_lft;
2576         int addr_type, err;
2577         u32 addr_flags = 0;
2578         struct inet6_dev *in6_dev;
2579         struct net *net = dev_net(dev);
2580
2581         pinfo = (struct prefix_info *) opt;
2582
2583         if (len < sizeof(struct prefix_info)) {
2584                 ADBG("addrconf: prefix option too short\n");
2585                 return;
2586         }
2587
2588         /*
2589          *      Validation checks ([ADDRCONF], page 19)
2590          */
2591
2592         addr_type = ipv6_addr_type(&pinfo->prefix);
2593
2594         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2595                 return;
2596
2597         valid_lft = ntohl(pinfo->valid);
2598         prefered_lft = ntohl(pinfo->prefered);
2599
2600         if (prefered_lft > valid_lft) {
2601                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2602                 return;
2603         }
2604
2605         in6_dev = in6_dev_get(dev);
2606
2607         if (!in6_dev) {
2608                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2609                                     dev->name);
2610                 return;
2611         }
2612
2613         /*
2614          *      Two things going on here:
2615          *      1) Add routes for on-link prefixes
2616          *      2) Configure prefixes with the auto flag set
2617          */
2618
2619         if (pinfo->onlink) {
2620                 struct rt6_info *rt;
2621                 unsigned long rt_expires;
2622
2623                 /* Avoid arithmetic overflow. Really, we could
2624                  * save rt_expires in seconds, likely valid_lft,
2625                  * but it would require division in fib gc, that it
2626                  * not good.
2627                  */
2628                 if (HZ > USER_HZ)
2629                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2630                 else
2631                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2632
2633                 if (addrconf_finite_timeout(rt_expires))
2634                         rt_expires *= HZ;
2635
2636                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2637                                                pinfo->prefix_len,
2638                                                dev,
2639                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2640                                                RTF_GATEWAY | RTF_DEFAULT);
2641
2642                 if (rt) {
2643                         /* Autoconf prefix route */
2644                         if (valid_lft == 0) {
2645                                 ip6_del_rt(rt);
2646                                 rt = NULL;
2647                         } else if (addrconf_finite_timeout(rt_expires)) {
2648                                 /* not infinity */
2649                                 rt6_set_expires(rt, jiffies + rt_expires);
2650                         } else {
2651                                 rt6_clean_expires(rt);
2652                         }
2653                 } else if (valid_lft) {
2654                         clock_t expires = 0;
2655                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2656                         if (addrconf_finite_timeout(rt_expires)) {
2657                                 /* not infinity */
2658                                 flags |= RTF_EXPIRES;
2659                                 expires = jiffies_to_clock_t(rt_expires);
2660                         }
2661                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2662                                               dev, expires, flags);
2663                 }
2664                 ip6_rt_put(rt);
2665         }
2666
2667         /* Try to figure out our local address for this prefix */
2668
2669         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2670                 struct in6_addr addr;
2671                 bool tokenized = false, dev_addr_generated = false;
2672
2673                 if (pinfo->prefix_len == 64) {
2674                         memcpy(&addr, &pinfo->prefix, 8);
2675
2676                         if (!ipv6_addr_any(&in6_dev->token)) {
2677                                 read_lock_bh(&in6_dev->lock);
2678                                 memcpy(addr.s6_addr + 8,
2679                                        in6_dev->token.s6_addr + 8, 8);
2680                                 read_unlock_bh(&in6_dev->lock);
2681                                 tokenized = true;
2682                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2683                                    !ipv6_generate_stable_address(&addr, 0,
2684                                                                  in6_dev)) {
2685                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2686                                 goto ok;
2687                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2688                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2689                                 goto put;
2690                         } else {
2691                                 dev_addr_generated = true;
2692                         }
2693                         goto ok;
2694                 }
2695                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2696                                     pinfo->prefix_len);
2697                 goto put;
2698
2699 ok:
2700                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2701                                                    &addr, addr_type,
2702                                                    addr_flags, sllao,
2703                                                    tokenized, valid_lft,
2704                                                    prefered_lft);
2705                 if (err)
2706                         goto put;
2707
2708                 /* Ignore error case here because previous prefix add addr was
2709                  * successful which will be notified.
2710                  */
2711                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2712                                               addr_type, addr_flags, sllao,
2713                                               tokenized, valid_lft,
2714                                               prefered_lft,
2715                                               dev_addr_generated);
2716         }
2717         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2718 put:
2719         in6_dev_put(in6_dev);
2720 }
2721
2722 /*
2723  *      Set destination address.
2724  *      Special case for SIT interfaces where we create a new "virtual"
2725  *      device.
2726  */
2727 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2728 {
2729         struct in6_ifreq ireq;
2730         struct net_device *dev;
2731         int err = -EINVAL;
2732
2733         rtnl_lock();
2734
2735         err = -EFAULT;
2736         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2737                 goto err_exit;
2738
2739         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2740
2741         err = -ENODEV;
2742         if (!dev)
2743                 goto err_exit;
2744
2745 #if IS_ENABLED(CONFIG_IPV6_SIT)
2746         if (dev->type == ARPHRD_SIT) {
2747                 const struct net_device_ops *ops = dev->netdev_ops;
2748                 struct ifreq ifr;
2749                 struct ip_tunnel_parm p;
2750
2751                 err = -EADDRNOTAVAIL;
2752                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2753                         goto err_exit;
2754
2755                 memset(&p, 0, sizeof(p));
2756                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2757                 p.iph.saddr = 0;
2758                 p.iph.version = 4;
2759                 p.iph.ihl = 5;
2760                 p.iph.protocol = IPPROTO_IPV6;
2761                 p.iph.ttl = 64;
2762                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2763
2764                 if (ops->ndo_do_ioctl) {
2765                         mm_segment_t oldfs = get_fs();
2766
2767                         set_fs(KERNEL_DS);
2768                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2769                         set_fs(oldfs);
2770                 } else
2771                         err = -EOPNOTSUPP;
2772
2773                 if (err == 0) {
2774                         err = -ENOBUFS;
2775                         dev = __dev_get_by_name(net, p.name);
2776                         if (!dev)
2777                                 goto err_exit;
2778                         err = dev_open(dev);
2779                 }
2780         }
2781 #endif
2782
2783 err_exit:
2784         rtnl_unlock();
2785         return err;
2786 }
2787
2788 static int ipv6_mc_config(struct sock *sk, bool join,
2789                           const struct in6_addr *addr, int ifindex)
2790 {
2791         int ret;
2792
2793         ASSERT_RTNL();
2794
2795         lock_sock(sk);
2796         if (join)
2797                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2798         else
2799                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2800         release_sock(sk);
2801
2802         return ret;
2803 }
2804
2805 /*
2806  *      Manual configuration of address on an interface
2807  */
2808 static int inet6_addr_add(struct net *net, int ifindex,
2809                           const struct in6_addr *pfx,
2810                           const struct in6_addr *peer_pfx,
2811                           unsigned int plen, __u32 ifa_flags,
2812                           __u32 prefered_lft, __u32 valid_lft,
2813                           struct netlink_ext_ack *extack)
2814 {
2815         struct inet6_ifaddr *ifp;
2816         struct inet6_dev *idev;
2817         struct net_device *dev;
2818         unsigned long timeout;
2819         clock_t expires;
2820         int scope;
2821         u32 flags;
2822
2823         ASSERT_RTNL();
2824
2825         if (plen > 128)
2826                 return -EINVAL;
2827
2828         /* check the lifetime */
2829         if (!valid_lft || prefered_lft > valid_lft)
2830                 return -EINVAL;
2831
2832         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2833                 return -EINVAL;
2834
2835         dev = __dev_get_by_index(net, ifindex);
2836         if (!dev)
2837                 return -ENODEV;
2838
2839         idev = addrconf_add_dev(dev);
2840         if (IS_ERR(idev))
2841                 return PTR_ERR(idev);
2842
2843         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2844                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2845                                          true, pfx, ifindex);
2846
2847                 if (ret < 0)
2848                         return ret;
2849         }
2850
2851         scope = ipv6_addr_scope(pfx);
2852
2853         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2854         if (addrconf_finite_timeout(timeout)) {
2855                 expires = jiffies_to_clock_t(timeout * HZ);
2856                 valid_lft = timeout;
2857                 flags = RTF_EXPIRES;
2858         } else {
2859                 expires = 0;
2860                 flags = 0;
2861                 ifa_flags |= IFA_F_PERMANENT;
2862         }
2863
2864         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2865         if (addrconf_finite_timeout(timeout)) {
2866                 if (timeout == 0)
2867                         ifa_flags |= IFA_F_DEPRECATED;
2868                 prefered_lft = timeout;
2869         }
2870
2871         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2872                             valid_lft, prefered_lft, true, extack);
2873
2874         if (!IS_ERR(ifp)) {
2875                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2876                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2877                                               expires, flags);
2878                 }
2879
2880                 /*
2881                  * Note that section 3.1 of RFC 4429 indicates
2882                  * that the Optimistic flag should not be set for
2883                  * manually configured addresses
2884                  */
2885                 addrconf_dad_start(ifp);
2886                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2887                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2888                                          true, jiffies);
2889                 in6_ifa_put(ifp);
2890                 addrconf_verify_rtnl();
2891                 return 0;
2892         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2893                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2894                                false, pfx, ifindex);
2895         }
2896
2897         return PTR_ERR(ifp);
2898 }
2899
2900 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2901                           const struct in6_addr *pfx, unsigned int plen)
2902 {
2903         struct inet6_ifaddr *ifp;
2904         struct inet6_dev *idev;
2905         struct net_device *dev;
2906
2907         if (plen > 128)
2908                 return -EINVAL;
2909
2910         dev = __dev_get_by_index(net, ifindex);
2911         if (!dev)
2912                 return -ENODEV;
2913
2914         idev = __in6_dev_get(dev);
2915         if (!idev)
2916                 return -ENXIO;
2917
2918         read_lock_bh(&idev->lock);
2919         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2920                 if (ifp->prefix_len == plen &&
2921                     ipv6_addr_equal(pfx, &ifp->addr)) {
2922                         in6_ifa_hold(ifp);
2923                         read_unlock_bh(&idev->lock);
2924
2925                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2926                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2927                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2928                                                  jiffies);
2929                         ipv6_del_addr(ifp);
2930                         addrconf_verify_rtnl();
2931                         if (ipv6_addr_is_multicast(pfx)) {
2932                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2933                                                false, pfx, dev->ifindex);
2934                         }
2935                         return 0;
2936                 }
2937         }
2938         read_unlock_bh(&idev->lock);
2939         return -EADDRNOTAVAIL;
2940 }
2941
2942
2943 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2944 {
2945         struct in6_ifreq ireq;
2946         int err;
2947
2948         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2949                 return -EPERM;
2950
2951         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2952                 return -EFAULT;
2953
2954         rtnl_lock();
2955         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2956                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2957                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL);
2958         rtnl_unlock();
2959         return err;
2960 }
2961
2962 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2963 {
2964         struct in6_ifreq ireq;
2965         int err;
2966
2967         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2968                 return -EPERM;
2969
2970         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2971                 return -EFAULT;
2972
2973         rtnl_lock();
2974         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2975                              ireq.ifr6_prefixlen);
2976         rtnl_unlock();
2977         return err;
2978 }
2979
2980 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2981                      int plen, int scope)
2982 {
2983         struct inet6_ifaddr *ifp;
2984
2985         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2986                             scope, IFA_F_PERMANENT,
2987                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
2988                             true, NULL);
2989         if (!IS_ERR(ifp)) {
2990                 spin_lock_bh(&ifp->lock);
2991                 ifp->flags &= ~IFA_F_TENTATIVE;
2992                 spin_unlock_bh(&ifp->lock);
2993                 rt_genid_bump_ipv6(dev_net(idev->dev));
2994                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2995                 in6_ifa_put(ifp);
2996         }
2997 }
2998
2999 #if IS_ENABLED(CONFIG_IPV6_SIT)
3000 static void sit_add_v4_addrs(struct inet6_dev *idev)
3001 {
3002         struct in6_addr addr;
3003         struct net_device *dev;
3004         struct net *net = dev_net(idev->dev);
3005         int scope, plen;
3006         u32 pflags = 0;
3007
3008         ASSERT_RTNL();
3009
3010         memset(&addr, 0, sizeof(struct in6_addr));
3011         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3012
3013         if (idev->dev->flags&IFF_POINTOPOINT) {
3014                 addr.s6_addr32[0] = htonl(0xfe800000);
3015                 scope = IFA_LINK;
3016                 plen = 64;
3017         } else {
3018                 scope = IPV6_ADDR_COMPATv4;
3019                 plen = 96;
3020                 pflags |= RTF_NONEXTHOP;
3021         }
3022
3023         if (addr.s6_addr32[3]) {
3024                 add_addr(idev, &addr, plen, scope);
3025                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
3026                 return;
3027         }
3028
3029         for_each_netdev(net, dev) {
3030                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3031                 if (in_dev && (dev->flags & IFF_UP)) {
3032                         struct in_ifaddr *ifa;
3033
3034                         int flag = scope;
3035
3036                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3037
3038                                 addr.s6_addr32[3] = ifa->ifa_local;
3039
3040                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3041                                         continue;
3042                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3043                                         if (idev->dev->flags&IFF_POINTOPOINT)
3044                                                 continue;
3045                                         flag |= IFA_HOST;
3046                                 }
3047
3048                                 add_addr(idev, &addr, plen, flag);
3049                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3050                                                       pflags);
3051                         }
3052                 }
3053         }
3054 }
3055 #endif
3056
3057 static void init_loopback(struct net_device *dev)
3058 {
3059         struct inet6_dev  *idev;
3060
3061         /* ::1 */
3062
3063         ASSERT_RTNL();
3064
3065         idev = ipv6_find_idev(dev);
3066         if (!idev) {
3067                 pr_debug("%s: add_dev failed\n", __func__);
3068                 return;
3069         }
3070
3071         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3072 }
3073
3074 void addrconf_add_linklocal(struct inet6_dev *idev,
3075                             const struct in6_addr *addr, u32 flags)
3076 {
3077         struct inet6_ifaddr *ifp;
3078         u32 addr_flags = flags | IFA_F_PERMANENT;
3079
3080 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3081         if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3082              idev->cnf.optimistic_dad) &&
3083             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3084                 addr_flags |= IFA_F_OPTIMISTIC;
3085 #endif
3086
3087         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3088                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
3089         if (!IS_ERR(ifp)) {
3090                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3091                 addrconf_dad_start(ifp);
3092                 in6_ifa_put(ifp);
3093         }
3094 }
3095 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3096
3097 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3098 {
3099         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3100                 return true;
3101
3102         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3103             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3104                 return true;
3105
3106         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3107             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3108                 return true;
3109
3110         return false;
3111 }
3112
3113 static int ipv6_generate_stable_address(struct in6_addr *address,
3114                                         u8 dad_count,
3115                                         const struct inet6_dev *idev)
3116 {
3117         static DEFINE_SPINLOCK(lock);
3118         static __u32 digest[SHA_DIGEST_WORDS];
3119         static __u32 workspace[SHA_WORKSPACE_WORDS];
3120
3121         static union {
3122                 char __data[SHA_MESSAGE_BYTES];
3123                 struct {
3124                         struct in6_addr secret;
3125                         __be32 prefix[2];
3126                         unsigned char hwaddr[MAX_ADDR_LEN];
3127                         u8 dad_count;
3128                 } __packed;
3129         } data;
3130
3131         struct in6_addr secret;
3132         struct in6_addr temp;
3133         struct net *net = dev_net(idev->dev);
3134
3135         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3136
3137         if (idev->cnf.stable_secret.initialized)
3138                 secret = idev->cnf.stable_secret.secret;
3139         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3140                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3141         else
3142                 return -1;
3143
3144 retry:
3145         spin_lock_bh(&lock);
3146
3147         sha_init(digest);
3148         memset(&data, 0, sizeof(data));
3149         memset(workspace, 0, sizeof(workspace));
3150         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3151         data.prefix[0] = address->s6_addr32[0];
3152         data.prefix[1] = address->s6_addr32[1];
3153         data.secret = secret;
3154         data.dad_count = dad_count;
3155
3156         sha_transform(digest, data.__data, workspace);
3157
3158         temp = *address;
3159         temp.s6_addr32[2] = (__force __be32)digest[0];
3160         temp.s6_addr32[3] = (__force __be32)digest[1];
3161
3162         spin_unlock_bh(&lock);
3163
3164         if (ipv6_reserved_interfaceid(temp)) {
3165                 dad_count++;
3166                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3167                         return -1;
3168                 goto retry;
3169         }
3170
3171         *address = temp;
3172         return 0;
3173 }
3174
3175 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3176 {
3177         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3178
3179         if (s->initialized)
3180                 return;
3181         s = &idev->cnf.stable_secret;
3182         get_random_bytes(&s->secret, sizeof(s->secret));
3183         s->initialized = true;
3184 }
3185
3186 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3187 {
3188         struct in6_addr addr;
3189
3190         /* no link local addresses on L3 master devices */
3191         if (netif_is_l3_master(idev->dev))
3192                 return;
3193
3194         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3195
3196         switch (idev->cnf.addr_gen_mode) {
3197         case IN6_ADDR_GEN_MODE_RANDOM:
3198                 ipv6_gen_mode_random_init(idev);
3199                 /* fallthrough */
3200         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3201                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3202                         addrconf_add_linklocal(idev, &addr,
3203                                                IFA_F_STABLE_PRIVACY);
3204                 else if (prefix_route)
3205                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3206                 break;
3207         case IN6_ADDR_GEN_MODE_EUI64:
3208                 /* addrconf_add_linklocal also adds a prefix_route and we
3209                  * only need to care about prefix routes if ipv6_generate_eui64
3210                  * couldn't generate one.
3211                  */
3212                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3213                         addrconf_add_linklocal(idev, &addr, 0);
3214                 else if (prefix_route)
3215                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3216                 break;
3217         case IN6_ADDR_GEN_MODE_NONE:
3218         default:
3219                 /* will not add any link local address */
3220                 break;
3221         }
3222 }
3223
3224 static void addrconf_dev_config(struct net_device *dev)
3225 {
3226         struct inet6_dev *idev;
3227
3228         ASSERT_RTNL();
3229
3230         if ((dev->type != ARPHRD_ETHER) &&
3231             (dev->type != ARPHRD_FDDI) &&
3232             (dev->type != ARPHRD_ARCNET) &&
3233             (dev->type != ARPHRD_INFINIBAND) &&
3234             (dev->type != ARPHRD_IEEE1394) &&
3235             (dev->type != ARPHRD_TUNNEL6) &&
3236             (dev->type != ARPHRD_6LOWPAN) &&
3237             (dev->type != ARPHRD_IP6GRE) &&
3238             (dev->type != ARPHRD_IPGRE) &&
3239             (dev->type != ARPHRD_TUNNEL) &&
3240             (dev->type != ARPHRD_NONE)) {
3241                 /* Alas, we support only Ethernet autoconfiguration. */
3242                 return;
3243         }
3244
3245         idev = addrconf_add_dev(dev);
3246         if (IS_ERR(idev))
3247                 return;
3248
3249         /* this device type has no EUI support */
3250         if (dev->type == ARPHRD_NONE &&
3251             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3252                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3253
3254         addrconf_addr_gen(idev, false);
3255 }
3256
3257 #if IS_ENABLED(CONFIG_IPV6_SIT)
3258 static void addrconf_sit_config(struct net_device *dev)
3259 {
3260         struct inet6_dev *idev;
3261
3262         ASSERT_RTNL();
3263
3264         /*
3265          * Configure the tunnel with one of our IPv4
3266          * addresses... we should configure all of
3267          * our v4 addrs in the tunnel
3268          */
3269
3270         idev = ipv6_find_idev(dev);
3271         if (!idev) {
3272                 pr_debug("%s: add_dev failed\n", __func__);
3273                 return;
3274         }
3275
3276         if (dev->priv_flags & IFF_ISATAP) {
3277                 addrconf_addr_gen(idev, false);
3278                 return;
3279         }
3280
3281         sit_add_v4_addrs(idev);
3282
3283         if (dev->flags&IFF_POINTOPOINT)
3284                 addrconf_add_mroute(dev);
3285 }
3286 #endif
3287
3288 #if IS_ENABLED(CONFIG_NET_IPGRE)
3289 static void addrconf_gre_config(struct net_device *dev)
3290 {
3291         struct inet6_dev *idev;
3292
3293         ASSERT_RTNL();
3294
3295         idev = ipv6_find_idev(dev);
3296         if (!idev) {
3297                 pr_debug("%s: add_dev failed\n", __func__);
3298                 return;
3299         }
3300
3301         addrconf_addr_gen(idev, true);
3302         if (dev->flags & IFF_POINTOPOINT)
3303                 addrconf_add_mroute(dev);
3304 }
3305 #endif
3306
3307 static int fixup_permanent_addr(struct inet6_dev *idev,
3308                                 struct inet6_ifaddr *ifp)
3309 {
3310         /* !rt6i_node means the host route was removed from the
3311          * FIB, for example, if 'lo' device is taken down. In that
3312          * case regenerate the host route.
3313          */
3314         if (!ifp->rt || !ifp->rt->rt6i_node) {
3315                 struct rt6_info *rt, *prev;
3316
3317                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3318                 if (IS_ERR(rt))
3319                         return PTR_ERR(rt);
3320
3321                 /* ifp->rt can be accessed outside of rtnl */
3322                 spin_lock(&ifp->lock);
3323                 prev = ifp->rt;
3324                 ifp->rt = rt;
3325                 spin_unlock(&ifp->lock);
3326
3327                 ip6_rt_put(prev);
3328         }
3329
3330         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3331                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3332                                       idev->dev, 0, 0);
3333         }
3334
3335         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3336                 addrconf_dad_start(ifp);
3337
3338         return 0;
3339 }
3340
3341 static void addrconf_permanent_addr(struct net_device *dev)
3342 {
3343         struct inet6_ifaddr *ifp, *tmp;
3344         struct inet6_dev *idev;
3345
3346         idev = __in6_dev_get(dev);
3347         if (!idev)
3348                 return;
3349
3350         write_lock_bh(&idev->lock);
3351
3352         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3353                 if ((ifp->flags & IFA_F_PERMANENT) &&
3354                     fixup_permanent_addr(idev, ifp) < 0) {
3355                         write_unlock_bh(&idev->lock);
3356                         in6_ifa_hold(ifp);
3357                         ipv6_del_addr(ifp);
3358                         write_lock_bh(&idev->lock);
3359
3360                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3361                                              idev->dev->name, &ifp->addr);
3362                 }
3363         }
3364
3365         write_unlock_bh(&idev->lock);
3366 }
3367
3368 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3369                            void *ptr)
3370 {
3371         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3372         struct netdev_notifier_changeupper_info *info;
3373         struct inet6_dev *idev = __in6_dev_get(dev);
3374         struct net *net = dev_net(dev);
3375         int run_pending = 0;
3376         int err;
3377
3378         switch (event) {
3379         case NETDEV_REGISTER:
3380                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3381                         idev = ipv6_add_dev(dev);
3382                         if (IS_ERR(idev))
3383                                 return notifier_from_errno(PTR_ERR(idev));
3384                 }
3385                 break;
3386
3387         case NETDEV_CHANGEMTU:
3388                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3389                 if (dev->mtu < IPV6_MIN_MTU) {
3390                         addrconf_ifdown(dev, dev != net->loopback_dev);
3391                         break;
3392                 }
3393
3394                 if (idev) {
3395                         rt6_mtu_change(dev, dev->mtu);
3396                         idev->cnf.mtu6 = dev->mtu;
3397                         break;
3398                 }
3399
3400                 /* allocate new idev */
3401                 idev = ipv6_add_dev(dev);
3402                 if (IS_ERR(idev))
3403                         break;
3404
3405                 /* device is still not ready */
3406                 if (!(idev->if_flags & IF_READY))
3407                         break;
3408
3409                 run_pending = 1;
3410
3411                 /* fall through */
3412
3413         case NETDEV_UP:
3414         case NETDEV_CHANGE:
3415                 if (dev->flags & IFF_SLAVE)
3416                         break;
3417
3418                 if (idev && idev->cnf.disable_ipv6)
3419                         break;
3420
3421                 if (event == NETDEV_UP) {
3422                         /* restore routes for permanent addresses */
3423                         addrconf_permanent_addr(dev);
3424
3425                         if (!addrconf_link_ready(dev)) {
3426                                 /* device is not ready yet. */
3427                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3428                                         dev->name);
3429                                 break;
3430                         }
3431
3432                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3433                                 idev = ipv6_add_dev(dev);
3434
3435                         if (!IS_ERR_OR_NULL(idev)) {
3436                                 idev->if_flags |= IF_READY;
3437                                 run_pending = 1;
3438                         }
3439                 } else if (event == NETDEV_CHANGE) {
3440                         if (!addrconf_link_ready(dev)) {
3441                                 /* device is still not ready. */
3442                                 break;
3443                         }
3444
3445                         if (idev) {
3446                                 if (idev->if_flags & IF_READY) {
3447                                         /* device is already configured -
3448                                          * but resend MLD reports, we might
3449                                          * have roamed and need to update
3450                                          * multicast snooping switches
3451                                          */
3452                                         ipv6_mc_up(idev);
3453                                         break;
3454                                 }
3455                                 idev->if_flags |= IF_READY;
3456                         }
3457
3458                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3459                                 dev->name);
3460
3461                         run_pending = 1;
3462                 }
3463
3464                 switch (dev->type) {
3465 #if IS_ENABLED(CONFIG_IPV6_SIT)
3466                 case ARPHRD_SIT:
3467                         addrconf_sit_config(dev);
3468                         break;
3469 #endif
3470 #if IS_ENABLED(CONFIG_NET_IPGRE)
3471                 case ARPHRD_IPGRE:
3472                         addrconf_gre_config(dev);
3473                         break;
3474 #endif
3475                 case ARPHRD_LOOPBACK:
3476                         init_loopback(dev);
3477                         break;
3478
3479                 default:
3480                         addrconf_dev_config(dev);
3481                         break;
3482                 }
3483
3484                 if (!IS_ERR_OR_NULL(idev)) {
3485                         if (run_pending)
3486                                 addrconf_dad_run(idev);
3487
3488                         /*
3489                          * If the MTU changed during the interface down,
3490                          * when the interface up, the changed MTU must be
3491                          * reflected in the idev as well as routers.
3492                          */
3493                         if (idev->cnf.mtu6 != dev->mtu &&
3494                             dev->mtu >= IPV6_MIN_MTU) {
3495                                 rt6_mtu_change(dev, dev->mtu);
3496                                 idev->cnf.mtu6 = dev->mtu;
3497                         }
3498                         idev->tstamp = jiffies;
3499                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3500
3501                         /*
3502                          * If the changed mtu during down is lower than
3503                          * IPV6_MIN_MTU stop IPv6 on this interface.
3504                          */
3505                         if (dev->mtu < IPV6_MIN_MTU)
3506                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3507                 }
3508                 break;
3509
3510         case NETDEV_DOWN:
3511         case NETDEV_UNREGISTER:
3512                 /*
3513                  *      Remove all addresses from this interface.
3514                  */
3515                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3516                 break;
3517
3518         case NETDEV_CHANGENAME:
3519                 if (idev) {
3520                         snmp6_unregister_dev(idev);
3521                         addrconf_sysctl_unregister(idev);
3522                         err = addrconf_sysctl_register(idev);
3523                         if (err)
3524                                 return notifier_from_errno(err);
3525                         err = snmp6_register_dev(idev);
3526                         if (err) {
3527                                 addrconf_sysctl_unregister(idev);
3528                                 return notifier_from_errno(err);
3529                         }
3530                 }
3531                 break;
3532
3533         case NETDEV_PRE_TYPE_CHANGE:
3534         case NETDEV_POST_TYPE_CHANGE:
3535                 if (idev)
3536                         addrconf_type_change(dev, event);
3537                 break;
3538
3539         case NETDEV_CHANGEUPPER:
3540                 info = ptr;
3541
3542                 /* flush all routes if dev is linked to or unlinked from
3543                  * an L3 master device (e.g., VRF)
3544                  */
3545                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3546                         addrconf_ifdown(dev, 0);
3547         }
3548
3549         return NOTIFY_OK;
3550 }
3551
3552 /*
3553  *      addrconf module should be notified of a device going up
3554  */
3555 static struct notifier_block ipv6_dev_notf = {
3556         .notifier_call = addrconf_notify,
3557         .priority = ADDRCONF_NOTIFY_PRIORITY,
3558 };
3559
3560 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3561 {
3562         struct inet6_dev *idev;
3563         ASSERT_RTNL();
3564
3565         idev = __in6_dev_get(dev);
3566
3567         if (event == NETDEV_POST_TYPE_CHANGE)
3568                 ipv6_mc_remap(idev);
3569         else if (event == NETDEV_PRE_TYPE_CHANGE)
3570                 ipv6_mc_unmap(idev);
3571 }
3572
3573 static bool addr_is_local(const struct in6_addr *addr)
3574 {
3575         return ipv6_addr_type(addr) &
3576                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3577 }
3578
3579 static int addrconf_ifdown(struct net_device *dev, int how)
3580 {
3581         struct net *net = dev_net(dev);
3582         struct inet6_dev *idev;
3583         struct inet6_ifaddr *ifa, *tmp;
3584         int _keep_addr;
3585         bool keep_addr;
3586         int state, i;
3587
3588         ASSERT_RTNL();
3589
3590         rt6_ifdown(net, dev);
3591         neigh_ifdown(&nd_tbl, dev);
3592
3593         idev = __in6_dev_get(dev);
3594         if (!idev)
3595                 return -ENODEV;
3596
3597         /*
3598          * Step 1: remove reference to ipv6 device from parent device.
3599          *         Do not dev_put!
3600          */
3601         if (how) {
3602                 idev->dead = 1;
3603
3604                 /* protected by rtnl_lock */
3605                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3606
3607                 /* Step 1.5: remove snmp6 entry */
3608                 snmp6_unregister_dev(idev);
3609
3610         }
3611
3612         /* aggregate the system setting and interface setting */
3613         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3614         if (!_keep_addr)
3615                 _keep_addr = idev->cnf.keep_addr_on_down;
3616
3617         /* combine the user config with event to determine if permanent
3618          * addresses are to be removed from address hash table
3619          */
3620         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3621
3622         /* Step 2: clear hash table */
3623         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3624                 struct hlist_head *h = &inet6_addr_lst[i];
3625
3626                 spin_lock_bh(&addrconf_hash_lock);
3627 restart:
3628                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3629                         if (ifa->idev == idev) {
3630                                 addrconf_del_dad_work(ifa);
3631                                 /* combined flag + permanent flag decide if
3632                                  * address is retained on a down event
3633                                  */
3634                                 if (!keep_addr ||
3635                                     !(ifa->flags & IFA_F_PERMANENT) ||
3636                                     addr_is_local(&ifa->addr)) {
3637                                         hlist_del_init_rcu(&ifa->addr_lst);
3638                                         goto restart;
3639                                 }
3640                         }
3641                 }
3642                 spin_unlock_bh(&addrconf_hash_lock);
3643         }
3644
3645         write_lock_bh(&idev->lock);
3646
3647         addrconf_del_rs_timer(idev);
3648
3649         /* Step 2: clear flags for stateless addrconf */
3650         if (!how)
3651                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3652
3653         /* Step 3: clear tempaddr list */
3654         while (!list_empty(&idev->tempaddr_list)) {
3655                 ifa = list_first_entry(&idev->tempaddr_list,
3656                                        struct inet6_ifaddr, tmp_list);
3657                 list_del(&ifa->tmp_list);
3658                 write_unlock_bh(&idev->lock);
3659                 spin_lock_bh(&ifa->lock);
3660
3661                 if (ifa->ifpub) {
3662                         in6_ifa_put(ifa->ifpub);
3663                         ifa->ifpub = NULL;
3664                 }
3665                 spin_unlock_bh(&ifa->lock);
3666                 in6_ifa_put(ifa);
3667                 write_lock_bh(&idev->lock);
3668         }
3669
3670         /* re-combine the user config with event to determine if permanent
3671          * addresses are to be removed from the interface list
3672          */
3673         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3674
3675         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3676                 struct rt6_info *rt = NULL;
3677                 bool keep;
3678
3679                 addrconf_del_dad_work(ifa);
3680
3681                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3682                         !addr_is_local(&ifa->addr);
3683
3684                 write_unlock_bh(&idev->lock);
3685                 spin_lock_bh(&ifa->lock);
3686
3687                 if (keep) {
3688                         /* set state to skip the notifier below */
3689                         state = INET6_IFADDR_STATE_DEAD;
3690                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3691                         if (!(ifa->flags & IFA_F_NODAD))
3692                                 ifa->flags |= IFA_F_TENTATIVE;
3693
3694                         rt = ifa->rt;
3695                         ifa->rt = NULL;
3696                 } else {
3697                         state = ifa->state;
3698                         ifa->state = INET6_IFADDR_STATE_DEAD;
3699                 }
3700
3701                 spin_unlock_bh(&ifa->lock);
3702
3703                 if (rt)
3704                         ip6_del_rt(rt);
3705
3706                 if (state != INET6_IFADDR_STATE_DEAD) {
3707                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3708                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3709                 } else {
3710                         if (idev->cnf.forwarding)
3711                                 addrconf_leave_anycast(ifa);
3712                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3713                 }
3714
3715                 write_lock_bh(&idev->lock);
3716                 if (!keep) {
3717                         list_del_rcu(&ifa->if_list);
3718                         in6_ifa_put(ifa);
3719                 }
3720         }
3721
3722         write_unlock_bh(&idev->lock);
3723
3724         /* Step 5: Discard anycast and multicast list */
3725         if (how) {
3726                 ipv6_ac_destroy_dev(idev);
3727                 ipv6_mc_destroy_dev(idev);
3728         } else {
3729                 ipv6_mc_down(idev);
3730         }
3731
3732         idev->tstamp = jiffies;
3733
3734         /* Last: Shot the device (if unregistered) */
3735         if (how) {
3736                 addrconf_sysctl_unregister(idev);
3737                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3738                 neigh_ifdown(&nd_tbl, dev);
3739                 in6_dev_put(idev);
3740         }
3741         return 0;
3742 }
3743
3744 static void addrconf_rs_timer(unsigned long data)
3745 {
3746         struct inet6_dev *idev = (struct inet6_dev *)data;
3747         struct net_device *dev = idev->dev;
3748         struct in6_addr lladdr;
3749
3750         write_lock(&idev->lock);
3751         if (idev->dead || !(idev->if_flags & IF_READY))
3752                 goto out;
3753
3754         if (!ipv6_accept_ra(idev))
3755                 goto out;
3756
3757         /* Announcement received after solicitation was sent */
3758         if (idev->if_flags & IF_RA_RCVD)
3759                 goto out;
3760
3761         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3762                 write_unlock(&idev->lock);
3763                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3764                         ndisc_send_rs(dev, &lladdr,
3765                                       &in6addr_linklocal_allrouters);
3766                 else
3767                         goto put;
3768
3769                 write_lock(&idev->lock);
3770                 idev->rs_interval = rfc3315_s14_backoff_update(
3771                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3772                 /* The wait after the last probe can be shorter */
3773                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3774                                              idev->cnf.rtr_solicits) ?
3775                                       idev->cnf.rtr_solicit_delay :
3776                                       idev->rs_interval);
3777         } else {
3778                 /*
3779                  * Note: we do not support deprecated "all on-link"
3780                  * assumption any longer.
3781                  */
3782                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3783         }
3784
3785 out:
3786         write_unlock(&idev->lock);
3787 put:
3788         in6_dev_put(idev);
3789 }
3790
3791 /*
3792  *      Duplicate Address Detection
3793  */
3794 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3795 {
3796         unsigned long rand_num;
3797         struct inet6_dev *idev = ifp->idev;
3798         u64 nonce;
3799
3800         if (ifp->flags & IFA_F_OPTIMISTIC)
3801                 rand_num = 0;
3802         else
3803                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3804
3805         nonce = 0;
3806         if (idev->cnf.enhanced_dad ||
3807             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3808                 do
3809                         get_random_bytes(&nonce, 6);
3810                 while (nonce == 0);
3811         }
3812         ifp->dad_nonce = nonce;
3813         ifp->dad_probes = idev->cnf.dad_transmits;
3814         addrconf_mod_dad_work(ifp, rand_num);
3815 }
3816
3817 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3818 {
3819         struct inet6_dev *idev = ifp->idev;
3820         struct net_device *dev = idev->dev;
3821         bool bump_id, notify = false;
3822
3823         addrconf_join_solict(dev, &ifp->addr);
3824
3825         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3826
3827         read_lock_bh(&idev->lock);
3828         spin_lock(&ifp->lock);
3829         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3830                 goto out;
3831
3832         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3833             (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3834              idev->cnf.accept_dad < 1) ||
3835             !(ifp->flags&IFA_F_TENTATIVE) ||
3836             ifp->flags & IFA_F_NODAD) {
3837                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3838                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3839                 spin_unlock(&ifp->lock);
3840                 read_unlock_bh(&idev->lock);
3841
3842                 addrconf_dad_completed(ifp, bump_id);
3843                 return;
3844         }
3845
3846         if (!(idev->if_flags & IF_READY)) {
3847                 spin_unlock(&ifp->lock);
3848                 read_unlock_bh(&idev->lock);
3849                 /*
3850                  * If the device is not ready:
3851                  * - keep it tentative if it is a permanent address.
3852                  * - otherwise, kill it.
3853                  */
3854                 in6_ifa_hold(ifp);
3855                 addrconf_dad_stop(ifp, 0);
3856                 return;
3857         }
3858
3859         /*
3860          * Optimistic nodes can start receiving
3861          * Frames right away
3862          */
3863         if (ifp->flags & IFA_F_OPTIMISTIC) {
3864                 ip6_ins_rt(ifp->rt);
3865                 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
3866                         /* Because optimistic nodes can use this address,
3867                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3868                          */
3869                         notify = true;
3870                 }
3871         }
3872
3873         addrconf_dad_kick(ifp);
3874 out:
3875         spin_unlock(&ifp->lock);
3876         read_unlock_bh(&idev->lock);
3877         if (notify)
3878                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3879 }
3880
3881 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3882 {
3883         bool begin_dad = false;
3884
3885         spin_lock_bh(&ifp->lock);
3886         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3887                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3888                 begin_dad = true;
3889         }
3890         spin_unlock_bh(&ifp->lock);
3891
3892         if (begin_dad)
3893                 addrconf_mod_dad_work(ifp, 0);
3894 }
3895
3896 static void addrconf_dad_work(struct work_struct *w)
3897 {
3898         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3899                                                 struct inet6_ifaddr,
3900                                                 dad_work);
3901         struct inet6_dev *idev = ifp->idev;
3902         bool bump_id, disable_ipv6 = false;
3903         struct in6_addr mcaddr;
3904
3905         enum {
3906                 DAD_PROCESS,
3907                 DAD_BEGIN,
3908                 DAD_ABORT,
3909         } action = DAD_PROCESS;
3910
3911         rtnl_lock();
3912
3913         spin_lock_bh(&ifp->lock);
3914         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3915                 action = DAD_BEGIN;
3916                 ifp->state = INET6_IFADDR_STATE_DAD;
3917         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3918                 action = DAD_ABORT;
3919                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3920
3921                 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3922                      idev->cnf.accept_dad > 1) &&
3923                     !idev->cnf.disable_ipv6 &&
3924                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3925                         struct in6_addr addr;
3926
3927                         addr.s6_addr32[0] = htonl(0xfe800000);
3928                         addr.s6_addr32[1] = 0;
3929
3930                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3931                             ipv6_addr_equal(&ifp->addr, &addr)) {
3932                                 /* DAD failed for link-local based on MAC */
3933                                 idev->cnf.disable_ipv6 = 1;
3934
3935                                 pr_info("%s: IPv6 being disabled!\n",
3936                                         ifp->idev->dev->name);
3937                                 disable_ipv6 = true;
3938                         }
3939                 }
3940         }
3941         spin_unlock_bh(&ifp->lock);
3942
3943         if (action == DAD_BEGIN) {
3944                 addrconf_dad_begin(ifp);
3945                 goto out;
3946         } else if (action == DAD_ABORT) {
3947                 in6_ifa_hold(ifp);
3948                 addrconf_dad_stop(ifp, 1);
3949                 if (disable_ipv6)
3950                         addrconf_ifdown(idev->dev, 0);
3951                 goto out;
3952         }
3953
3954         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3955                 goto out;
3956
3957         write_lock_bh(&idev->lock);
3958         if (idev->dead || !(idev->if_flags & IF_READY)) {
3959                 write_unlock_bh(&idev->lock);
3960                 goto out;
3961         }
3962
3963         spin_lock(&ifp->lock);
3964         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3965                 spin_unlock(&ifp->lock);
3966                 write_unlock_bh(&idev->lock);
3967                 goto out;
3968         }
3969
3970         if (ifp->dad_probes == 0) {
3971                 /*
3972                  * DAD was successful
3973                  */
3974
3975                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3976                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3977                 spin_unlock(&ifp->lock);
3978                 write_unlock_bh(&idev->lock);
3979
3980                 addrconf_dad_completed(ifp, bump_id);
3981
3982                 goto out;
3983         }
3984
3985         ifp->dad_probes--;
3986         addrconf_mod_dad_work(ifp,
3987                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3988         spin_unlock(&ifp->lock);
3989         write_unlock_bh(&idev->lock);
3990
3991         /* send a neighbour solicitation for our addr */
3992         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3993         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3994                       ifp->dad_nonce);
3995 out:
3996         in6_ifa_put(ifp);
3997         rtnl_unlock();
3998 }
3999
4000 /* ifp->idev must be at least read locked */
4001 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4002 {
4003         struct inet6_ifaddr *ifpiter;
4004         struct inet6_dev *idev = ifp->idev;
4005
4006         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4007                 if (ifpiter->scope > IFA_LINK)
4008                         break;
4009                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4010                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4011                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4012                     IFA_F_PERMANENT)
4013                         return false;
4014         }
4015         return true;
4016 }
4017
4018 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
4019 {
4020         struct net_device *dev = ifp->idev->dev;
4021         struct in6_addr lladdr;
4022         bool send_rs, send_mld;
4023
4024         addrconf_del_dad_work(ifp);
4025
4026         /*
4027          *      Configure the address for reception. Now it is valid.
4028          */
4029
4030         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4031
4032         /* If added prefix is link local and we are prepared to process
4033            router advertisements, start sending router solicitations.
4034          */
4035
4036         read_lock_bh(&ifp->idev->lock);
4037         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4038         send_rs = send_mld &&
4039                   ipv6_accept_ra(ifp->idev) &&
4040                   ifp->idev->cnf.rtr_solicits != 0 &&
4041                   (dev->flags&IFF_LOOPBACK) == 0;
4042         read_unlock_bh(&ifp->idev->lock);
4043
4044         /* While dad is in progress mld report's source address is in6_addrany.
4045          * Resend with proper ll now.
4046          */
4047         if (send_mld)
4048                 ipv6_mc_dad_complete(ifp->idev);
4049
4050         if (send_rs) {
4051                 /*
4052                  *      If a host as already performed a random delay
4053                  *      [...] as part of DAD [...] there is no need
4054                  *      to delay again before sending the first RS
4055                  */
4056                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4057                         return;
4058                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4059
4060                 write_lock_bh(&ifp->idev->lock);
4061                 spin_lock(&ifp->lock);
4062                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4063                         ifp->idev->cnf.rtr_solicit_interval);
4064                 ifp->idev->rs_probes = 1;
4065                 ifp->idev->if_flags |= IF_RS_SENT;
4066                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4067                 spin_unlock(&ifp->lock);
4068                 write_unlock_bh(&ifp->idev->lock);
4069         }
4070
4071         if (bump_id)
4072                 rt_genid_bump_ipv6(dev_net(dev));
4073
4074         /* Make sure that a new temporary address will be created
4075          * before this temporary address becomes deprecated.
4076          */
4077         if (ifp->flags & IFA_F_TEMPORARY)
4078                 addrconf_verify_rtnl();
4079 }
4080
4081 static void addrconf_dad_run(struct inet6_dev *idev)
4082 {
4083         struct inet6_ifaddr *ifp;
4084
4085         read_lock_bh(&idev->lock);
4086         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4087                 spin_lock(&ifp->lock);
4088                 if (ifp->flags & IFA_F_TENTATIVE &&
4089                     ifp->state == INET6_IFADDR_STATE_DAD)
4090                         addrconf_dad_kick(ifp);
4091                 spin_unlock(&ifp->lock);
4092         }
4093         read_unlock_bh(&idev->lock);
4094 }
4095
4096 #ifdef CONFIG_PROC_FS
4097 struct if6_iter_state {
4098         struct seq_net_private p;
4099         int bucket;
4100         int offset;
4101 };
4102
4103 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4104 {
4105         struct if6_iter_state *state = seq->private;
4106         struct net *net = seq_file_net(seq);
4107         struct inet6_ifaddr *ifa = NULL;
4108         int p = 0;
4109
4110         /* initial bucket if pos is 0 */
4111         if (pos == 0) {
4112                 state->bucket = 0;
4113                 state->offset = 0;
4114         }
4115
4116         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4117                 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4118                                          addr_lst) {
4119                         if (!net_eq(dev_net(ifa->idev->dev), net))
4120                                 continue;
4121                         /* sync with offset */
4122                         if (p < state->offset) {
4123                                 p++;
4124                                 continue;
4125                         }
4126                         state->offset++;
4127                         return ifa;
4128                 }
4129
4130                 /* prepare for next bucket */
4131                 state->offset = 0;
4132                 p = 0;
4133         }
4134         return NULL;
4135 }
4136
4137 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4138                                          struct inet6_ifaddr *ifa)
4139 {
4140         struct if6_iter_state *state = seq->private;
4141         struct net *net = seq_file_net(seq);
4142
4143         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4144                 if (!net_eq(dev_net(ifa->idev->dev), net))
4145                         continue;
4146                 state->offset++;
4147                 return ifa;
4148         }
4149
4150         while (++state->bucket < IN6_ADDR_HSIZE) {
4151                 state->offset = 0;
4152                 hlist_for_each_entry_rcu(ifa,
4153                                      &inet6_addr_lst[state->bucket], addr_lst) {
4154                         if (!net_eq(dev_net(ifa->idev->dev), net))
4155                                 continue;
4156                         state->offset++;
4157                         return ifa;
4158                 }
4159         }
4160
4161         return NULL;
4162 }
4163
4164 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4165         __acquires(rcu)
4166 {
4167         rcu_read_lock();
4168         return if6_get_first(seq, *pos);
4169 }
4170
4171 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4172 {
4173         struct inet6_ifaddr *ifa;
4174
4175         ifa = if6_get_next(seq, v);
4176         ++*pos;
4177         return ifa;
4178 }
4179
4180 static void if6_seq_stop(struct seq_file *seq, void *v)
4181         __releases(rcu)
4182 {
4183         rcu_read_unlock();
4184 }
4185
4186 static int if6_seq_show(struct seq_file *seq, void *v)
4187 {
4188         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4189         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4190                    &ifp->addr,
4191                    ifp->idev->dev->ifindex,
4192                    ifp->prefix_len,
4193                    ifp->scope,
4194                    (u8) ifp->flags,
4195                    ifp->idev->dev->name);
4196         return 0;
4197 }
4198
4199 static const struct seq_operations if6_seq_ops = {
4200         .start  = if6_seq_start,
4201         .next   = if6_seq_next,
4202         .show   = if6_seq_show,
4203         .stop   = if6_seq_stop,
4204 };
4205
4206 static int if6_seq_open(struct inode *inode, struct file *file)
4207 {
4208         return seq_open_net(inode, file, &if6_seq_ops,
4209                             sizeof(struct if6_iter_state));
4210 }
4211
4212 static const struct file_operations if6_fops = {
4213         .owner          = THIS_MODULE,
4214         .open           = if6_seq_open,
4215         .read           = seq_read,
4216         .llseek         = seq_lseek,
4217         .release        = seq_release_net,
4218 };
4219
4220 static int __net_init if6_proc_net_init(struct net *net)
4221 {
4222         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4223                 return -ENOMEM;
4224         return 0;
4225 }
4226
4227 static void __net_exit if6_proc_net_exit(struct net *net)
4228 {
4229         remove_proc_entry("if_inet6", net->proc_net);
4230 }
4231
4232 static struct pernet_operations if6_proc_net_ops = {
4233         .init = if6_proc_net_init,
4234         .exit = if6_proc_net_exit,
4235 };
4236
4237 int __init if6_proc_init(void)
4238 {
4239         return register_pernet_subsys(&if6_proc_net_ops);
4240 }
4241
4242 void if6_proc_exit(void)
4243 {
4244         unregister_pernet_subsys(&if6_proc_net_ops);
4245 }
4246 #endif  /* CONFIG_PROC_FS */
4247
4248 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4249 /* Check if address is a home address configured on any interface. */
4250 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4251 {
4252         unsigned int hash = inet6_addr_hash(net, addr);
4253         struct inet6_ifaddr *ifp = NULL;
4254         int ret = 0;
4255
4256         rcu_read_lock();
4257         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4258                 if (!net_eq(dev_net(ifp->idev->dev), net))
4259                         continue;
4260                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4261                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4262                         ret = 1;
4263                         break;
4264                 }
4265         }
4266         rcu_read_unlock();
4267         return ret;
4268 }
4269 #endif
4270
4271 /*
4272  *      Periodic address status verification
4273  */
4274
4275 static void addrconf_verify_rtnl(void)
4276 {
4277         unsigned long now, next, next_sec, next_sched;
4278         struct inet6_ifaddr *ifp;
4279         int i;
4280
4281         ASSERT_RTNL();
4282
4283         rcu_read_lock_bh();
4284         now = jiffies;
4285         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4286
4287         cancel_delayed_work(&addr_chk_work);
4288
4289         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4290 restart:
4291                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4292                         unsigned long age;
4293
4294                         /* When setting preferred_lft to a value not zero or
4295                          * infinity, while valid_lft is infinity
4296                          * IFA_F_PERMANENT has a non-infinity life time.
4297                          */
4298                         if ((ifp->flags & IFA_F_PERMANENT) &&
4299                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4300                                 continue;
4301
4302                         spin_lock(&ifp->lock);
4303                         /* We try to batch several events at once. */
4304                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4305
4306                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4307                             age >= ifp->valid_lft) {
4308                                 spin_unlock(&ifp->lock);
4309                                 in6_ifa_hold(ifp);
4310                                 ipv6_del_addr(ifp);
4311                                 goto restart;
4312                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4313                                 spin_unlock(&ifp->lock);
4314                                 continue;
4315                         } else if (age >= ifp->prefered_lft) {
4316                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4317                                 int deprecate = 0;
4318
4319                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4320                                         deprecate = 1;
4321                                         ifp->flags |= IFA_F_DEPRECATED;
4322                                 }
4323
4324                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4325                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4326                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4327
4328                                 spin_unlock(&ifp->lock);
4329
4330                                 if (deprecate) {
4331                                         in6_ifa_hold(ifp);
4332
4333                                         ipv6_ifa_notify(0, ifp);
4334                                         in6_ifa_put(ifp);
4335                                         goto restart;
4336                                 }
4337                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4338                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4339                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4340                                         ifp->idev->cnf.dad_transmits *
4341                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4342
4343                                 if (age >= ifp->prefered_lft - regen_advance) {
4344                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4345                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4346                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4347                                         if (!ifp->regen_count && ifpub) {
4348                                                 ifp->regen_count++;
4349                                                 in6_ifa_hold(ifp);
4350                                                 in6_ifa_hold(ifpub);
4351                                                 spin_unlock(&ifp->lock);
4352
4353                                                 spin_lock(&ifpub->lock);
4354                                                 ifpub->regen_count = 0;
4355                                                 spin_unlock(&ifpub->lock);
4356                                                 ipv6_create_tempaddr(ifpub, ifp, true);
4357                                                 in6_ifa_put(ifpub);
4358                                                 in6_ifa_put(ifp);
4359                                                 goto restart;
4360                                         }
4361                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4362                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4363                                 spin_unlock(&ifp->lock);
4364                         } else {
4365                                 /* ifp->prefered_lft <= ifp->valid_lft */
4366                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4367                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4368                                 spin_unlock(&ifp->lock);
4369                         }
4370                 }
4371         }
4372
4373         next_sec = round_jiffies_up(next);
4374         next_sched = next;
4375
4376         /* If rounded timeout is accurate enough, accept it. */
4377         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4378                 next_sched = next_sec;
4379
4380         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4381         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4382                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4383
4384         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4385               now, next, next_sec, next_sched);
4386         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4387         rcu_read_unlock_bh();
4388 }
4389
4390 static void addrconf_verify_work(struct work_struct *w)
4391 {
4392         rtnl_lock();
4393         addrconf_verify_rtnl();
4394         rtnl_unlock();
4395 }
4396
4397 static void addrconf_verify(void)
4398 {
4399         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4400 }
4401
4402 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4403                                      struct in6_addr **peer_pfx)
4404 {
4405         struct in6_addr *pfx = NULL;
4406
4407         *peer_pfx = NULL;
4408
4409         if (addr)
4410                 pfx = nla_data(addr);
4411
4412         if (local) {
4413                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4414                         *peer_pfx = pfx;
4415                 pfx = nla_data(local);
4416         }
4417
4418         return pfx;
4419 }
4420
4421 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4422         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4423         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4424         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4425         [IFA_FLAGS]             = { .len = sizeof(u32) },
4426 };
4427
4428 static int
4429 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4430                   struct netlink_ext_ack *extack)
4431 {
4432         struct net *net = sock_net(skb->sk);
4433         struct ifaddrmsg *ifm;
4434         struct nlattr *tb[IFA_MAX+1];
4435         struct in6_addr *pfx, *peer_pfx;
4436         u32 ifa_flags;
4437         int err;
4438
4439         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4440                           extack);
4441         if (err < 0)
4442                 return err;
4443
4444         ifm = nlmsg_data(nlh);
4445         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4446         if (!pfx)
4447                 return -EINVAL;
4448
4449         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4450
4451         /* We ignore other flags so far. */
4452         ifa_flags &= IFA_F_MANAGETEMPADDR;
4453
4454         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4455                               ifm->ifa_prefixlen);
4456 }
4457
4458 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4459                              u32 prefered_lft, u32 valid_lft)
4460 {
4461         u32 flags;
4462         clock_t expires;
4463         unsigned long timeout;
4464         bool was_managetempaddr;
4465         bool had_prefixroute;
4466
4467         ASSERT_RTNL();
4468
4469         if (!valid_lft || (prefered_lft > valid_lft))
4470                 return -EINVAL;
4471
4472         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4473             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4474                 return -EINVAL;
4475
4476         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4477         if (addrconf_finite_timeout(timeout)) {
4478                 expires = jiffies_to_clock_t(timeout * HZ);
4479                 valid_lft = timeout;
4480                 flags = RTF_EXPIRES;
4481         } else {
4482                 expires = 0;
4483                 flags = 0;
4484                 ifa_flags |= IFA_F_PERMANENT;
4485         }
4486
4487         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4488         if (addrconf_finite_timeout(timeout)) {
4489                 if (timeout == 0)
4490                         ifa_flags |= IFA_F_DEPRECATED;
4491                 prefered_lft = timeout;
4492         }
4493
4494         spin_lock_bh(&ifp->lock);
4495         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4496         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4497                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4498         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4499                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4500                         IFA_F_NOPREFIXROUTE);
4501         ifp->flags |= ifa_flags;
4502         ifp->tstamp = jiffies;
4503         ifp->valid_lft = valid_lft;
4504         ifp->prefered_lft = prefered_lft;
4505
4506         spin_unlock_bh(&ifp->lock);
4507         if (!(ifp->flags&IFA_F_TENTATIVE))
4508                 ipv6_ifa_notify(0, ifp);
4509
4510         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4511                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4512                                       expires, flags);
4513         } else if (had_prefixroute) {
4514                 enum cleanup_prefix_rt_t action;
4515                 unsigned long rt_expires;
4516
4517                 write_lock_bh(&ifp->idev->lock);
4518                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4519                 write_unlock_bh(&ifp->idev->lock);
4520
4521                 if (action != CLEANUP_PREFIX_RT_NOP) {
4522                         cleanup_prefix_route(ifp, rt_expires,
4523                                 action == CLEANUP_PREFIX_RT_DEL);
4524                 }
4525         }
4526
4527         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4528                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4529                         valid_lft = prefered_lft = 0;
4530                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4531                                  !was_managetempaddr, jiffies);
4532         }
4533
4534         addrconf_verify_rtnl();
4535
4536         return 0;
4537 }
4538
4539 static int
4540 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4541                   struct netlink_ext_ack *extack)
4542 {
4543         struct net *net = sock_net(skb->sk);
4544         struct ifaddrmsg *ifm;
4545         struct nlattr *tb[IFA_MAX+1];
4546         struct in6_addr *pfx, *peer_pfx;
4547         struct inet6_ifaddr *ifa;
4548         struct net_device *dev;
4549         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4550         u32 ifa_flags;
4551         int err;
4552
4553         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4554                           extack);
4555         if (err < 0)
4556                 return err;
4557
4558         ifm = nlmsg_data(nlh);
4559         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4560         if (!pfx)
4561                 return -EINVAL;
4562
4563         if (tb[IFA_CACHEINFO]) {
4564                 struct ifa_cacheinfo *ci;
4565
4566                 ci = nla_data(tb[IFA_CACHEINFO]);
4567                 valid_lft = ci->ifa_valid;
4568                 preferred_lft = ci->ifa_prefered;
4569         } else {
4570                 preferred_lft = INFINITY_LIFE_TIME;
4571                 valid_lft = INFINITY_LIFE_TIME;
4572         }
4573
4574         dev =  __dev_get_by_index(net, ifm->ifa_index);
4575         if (!dev)
4576                 return -ENODEV;
4577
4578         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4579
4580         /* We ignore other flags so far. */
4581         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4582                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4583
4584         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4585         if (!ifa) {
4586                 /*
4587                  * It would be best to check for !NLM_F_CREATE here but
4588                  * userspace already relies on not having to provide this.
4589                  */
4590                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4591                                       ifm->ifa_prefixlen, ifa_flags,
4592                                       preferred_lft, valid_lft, extack);
4593         }
4594
4595         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4596             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4597                 err = -EEXIST;
4598         else
4599                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4600
4601         in6_ifa_put(ifa);
4602
4603         return err;
4604 }
4605
4606 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4607                           u8 scope, int ifindex)
4608 {
4609         struct ifaddrmsg *ifm;
4610
4611         ifm = nlmsg_data(nlh);
4612         ifm->ifa_family = AF_INET6;
4613         ifm->ifa_prefixlen = prefixlen;
4614         ifm->ifa_flags = flags;
4615         ifm->ifa_scope = scope;
4616         ifm->ifa_index = ifindex;
4617 }
4618
4619 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4620                          unsigned long tstamp, u32 preferred, u32 valid)
4621 {
4622         struct ifa_cacheinfo ci;
4623
4624         ci.cstamp = cstamp_delta(cstamp);
4625         ci.tstamp = cstamp_delta(tstamp);
4626         ci.ifa_prefered = preferred;
4627         ci.ifa_valid = valid;
4628
4629         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4630 }
4631
4632 static inline int rt_scope(int ifa_scope)
4633 {
4634         if (ifa_scope & IFA_HOST)
4635                 return RT_SCOPE_HOST;
4636         else if (ifa_scope & IFA_LINK)
4637                 return RT_SCOPE_LINK;
4638         else if (ifa_scope & IFA_SITE)
4639                 return RT_SCOPE_SITE;
4640         else
4641                 return RT_SCOPE_UNIVERSE;
4642 }
4643
4644 static inline int inet6_ifaddr_msgsize(void)
4645 {
4646         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4647                + nla_total_size(16) /* IFA_LOCAL */
4648                + nla_total_size(16) /* IFA_ADDRESS */
4649                + nla_total_size(sizeof(struct ifa_cacheinfo))
4650                + nla_total_size(4)  /* IFA_FLAGS */;
4651 }
4652
4653 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4654                              u32 portid, u32 seq, int event, unsigned int flags)
4655 {
4656         struct nlmsghdr  *nlh;
4657         u32 preferred, valid;
4658
4659         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4660         if (!nlh)
4661                 return -EMSGSIZE;
4662
4663         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4664                       ifa->idev->dev->ifindex);
4665
4666         if (!((ifa->flags&IFA_F_PERMANENT) &&
4667               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4668                 preferred = ifa->prefered_lft;
4669                 valid = ifa->valid_lft;
4670                 if (preferred != INFINITY_LIFE_TIME) {
4671                         long tval = (jiffies - ifa->tstamp)/HZ;
4672                         if (preferred > tval)
4673                                 preferred -= tval;
4674                         else
4675                                 preferred = 0;
4676                         if (valid != INFINITY_LIFE_TIME) {
4677                                 if (valid > tval)
4678                                         valid -= tval;
4679                                 else
4680                                         valid = 0;
4681                         }
4682                 }
4683         } else {
4684                 preferred = INFINITY_LIFE_TIME;
4685                 valid = INFINITY_LIFE_TIME;
4686         }
4687
4688         if (!ipv6_addr_any(&ifa->peer_addr)) {
4689                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4690                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4691                         goto error;
4692         } else
4693                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4694                         goto error;
4695
4696         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4697                 goto error;
4698
4699         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4700                 goto error;
4701
4702         nlmsg_end(skb, nlh);
4703         return 0;
4704
4705 error:
4706         nlmsg_cancel(skb, nlh);
4707         return -EMSGSIZE;
4708 }
4709
4710 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4711                                 u32 portid, u32 seq, int event, u16 flags)
4712 {
4713         struct nlmsghdr  *nlh;
4714         u8 scope = RT_SCOPE_UNIVERSE;
4715         int ifindex = ifmca->idev->dev->ifindex;
4716
4717         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4718                 scope = RT_SCOPE_SITE;
4719
4720         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4721         if (!nlh)
4722                 return -EMSGSIZE;
4723
4724         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4725         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4726             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4727                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4728                 nlmsg_cancel(skb, nlh);
4729                 return -EMSGSIZE;
4730         }
4731
4732         nlmsg_end(skb, nlh);
4733         return 0;
4734 }
4735
4736 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4737                                 u32 portid, u32 seq, int event, unsigned int flags)
4738 {
4739         struct nlmsghdr  *nlh;
4740         u8 scope = RT_SCOPE_UNIVERSE;
4741         int ifindex = ifaca->aca_idev->dev->ifindex;
4742
4743         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4744                 scope = RT_SCOPE_SITE;
4745
4746         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4747         if (!nlh)
4748                 return -EMSGSIZE;
4749
4750         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4751         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4752             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4753                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4754                 nlmsg_cancel(skb, nlh);
4755                 return -EMSGSIZE;
4756         }
4757
4758         nlmsg_end(skb, nlh);
4759         return 0;
4760 }
4761
4762 enum addr_type_t {
4763         UNICAST_ADDR,
4764         MULTICAST_ADDR,
4765         ANYCAST_ADDR,
4766 };
4767
4768 /* called with rcu_read_lock() */
4769 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4770                           struct netlink_callback *cb, enum addr_type_t type,
4771                           int s_ip_idx, int *p_ip_idx)
4772 {
4773         struct ifmcaddr6 *ifmca;
4774         struct ifacaddr6 *ifaca;
4775         int err = 1;
4776         int ip_idx = *p_ip_idx;
4777
4778         read_lock_bh(&idev->lock);
4779         switch (type) {
4780         case UNICAST_ADDR: {
4781                 struct inet6_ifaddr *ifa;
4782
4783                 /* unicast address incl. temp addr */
4784                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4785                         if (++ip_idx < s_ip_idx)
4786                                 continue;
4787                         err = inet6_fill_ifaddr(skb, ifa,
4788                                                 NETLINK_CB(cb->skb).portid,
4789                                                 cb->nlh->nlmsg_seq,
4790                                                 RTM_NEWADDR,
4791                                                 NLM_F_MULTI);
4792                         if (err < 0)
4793                                 break;
4794                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4795                 }
4796                 break;
4797         }
4798         case MULTICAST_ADDR:
4799                 /* multicast address */
4800                 for (ifmca = idev->mc_list; ifmca;
4801                      ifmca = ifmca->next, ip_idx++) {
4802                         if (ip_idx < s_ip_idx)
4803                                 continue;
4804                         err = inet6_fill_ifmcaddr(skb, ifmca,
4805                                                   NETLINK_CB(cb->skb).portid,
4806                                                   cb->nlh->nlmsg_seq,
4807                                                   RTM_GETMULTICAST,
4808                                                   NLM_F_MULTI);
4809                         if (err < 0)
4810                                 break;
4811                 }
4812                 break;
4813         case ANYCAST_ADDR:
4814                 /* anycast address */
4815                 for (ifaca = idev->ac_list; ifaca;
4816                      ifaca = ifaca->aca_next, ip_idx++) {
4817                         if (ip_idx < s_ip_idx)
4818                                 continue;
4819                         err = inet6_fill_ifacaddr(skb, ifaca,
4820                                                   NETLINK_CB(cb->skb).portid,
4821                                                   cb->nlh->nlmsg_seq,
4822                                                   RTM_GETANYCAST,
4823                                                   NLM_F_MULTI);
4824                         if (err < 0)
4825                                 break;
4826                 }
4827                 break;
4828         default:
4829                 break;
4830         }
4831         read_unlock_bh(&idev->lock);
4832         *p_ip_idx = ip_idx;
4833         return err;
4834 }
4835
4836 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4837                            enum addr_type_t type)
4838 {
4839         struct net *net = sock_net(skb->sk);
4840         int h, s_h;
4841         int idx, ip_idx;
4842         int s_idx, s_ip_idx;
4843         struct net_device *dev;
4844         struct inet6_dev *idev;
4845         struct hlist_head *head;
4846
4847         s_h = cb->args[0];
4848         s_idx = idx = cb->args[1];
4849         s_ip_idx = ip_idx = cb->args[2];
4850
4851         rcu_read_lock();
4852         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4853         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4854                 idx = 0;
4855                 head = &net->dev_index_head[h];
4856                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4857                         if (idx < s_idx)
4858                                 goto cont;
4859                         if (h > s_h || idx > s_idx)
4860                                 s_ip_idx = 0;
4861                         ip_idx = 0;
4862                         idev = __in6_dev_get(dev);
4863                         if (!idev)
4864                                 goto cont;
4865
4866                         if (in6_dump_addrs(idev, skb, cb, type,
4867                                            s_ip_idx, &ip_idx) < 0)
4868                                 goto done;
4869 cont:
4870                         idx++;
4871                 }
4872         }
4873 done:
4874         rcu_read_unlock();
4875         cb->args[0] = h;
4876         cb->args[1] = idx;
4877         cb->args[2] = ip_idx;
4878
4879         return skb->len;
4880 }
4881
4882 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4883 {
4884         enum addr_type_t type = UNICAST_ADDR;
4885
4886         return inet6_dump_addr(skb, cb, type);
4887 }
4888
4889 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4890 {
4891         enum addr_type_t type = MULTICAST_ADDR;
4892
4893         return inet6_dump_addr(skb, cb, type);
4894 }
4895
4896
4897 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4898 {
4899         enum addr_type_t type = ANYCAST_ADDR;
4900
4901         return inet6_dump_addr(skb, cb, type);
4902 }
4903
4904 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4905                              struct netlink_ext_ack *extack)
4906 {
4907         struct net *net = sock_net(in_skb->sk);
4908         struct ifaddrmsg *ifm;
4909         struct nlattr *tb[IFA_MAX+1];
4910         struct in6_addr *addr = NULL, *peer;
4911         struct net_device *dev = NULL;
4912         struct inet6_ifaddr *ifa;
4913         struct sk_buff *skb;
4914         int err;
4915
4916         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4917                           extack);
4918         if (err < 0)
4919                 return err;
4920
4921         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4922         if (!addr)
4923                 return -EINVAL;
4924
4925         ifm = nlmsg_data(nlh);
4926         if (ifm->ifa_index)
4927                 dev = dev_get_by_index(net, ifm->ifa_index);
4928
4929         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4930         if (!ifa) {
4931                 err = -EADDRNOTAVAIL;
4932                 goto errout;
4933         }
4934
4935         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4936         if (!skb) {
4937                 err = -ENOBUFS;
4938                 goto errout_ifa;
4939         }
4940
4941         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4942                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4943         if (err < 0) {
4944                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4945                 WARN_ON(err == -EMSGSIZE);
4946                 kfree_skb(skb);
4947                 goto errout_ifa;
4948         }
4949         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4950 errout_ifa:
4951         in6_ifa_put(ifa);
4952 errout:
4953         if (dev)
4954                 dev_put(dev);
4955         return err;
4956 }
4957
4958 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4959 {
4960         struct sk_buff *skb;
4961         struct net *net = dev_net(ifa->idev->dev);
4962         int err = -ENOBUFS;
4963
4964         /* Don't send DELADDR notification for TENTATIVE address,
4965          * since NEWADDR notification is sent only after removing
4966          * TENTATIVE flag, if DAD has not failed.
4967          */
4968         if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
4969             event == RTM_DELADDR)
4970                 return;
4971
4972         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4973         if (!skb)
4974                 goto errout;
4975
4976         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4977         if (err < 0) {
4978                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4979                 WARN_ON(err == -EMSGSIZE);
4980                 kfree_skb(skb);
4981                 goto errout;
4982         }
4983         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4984         return;
4985 errout:
4986         if (err < 0)
4987                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4988 }
4989
4990 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4991                                 __s32 *array, int bytes)
4992 {
4993         BUG_ON(bytes < (DEVCONF_MAX * 4));
4994
4995         memset(array, 0, bytes);
4996         array[DEVCONF_FORWARDING] = cnf->forwarding;
4997         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4998         array[DEVCONF_MTU6] = cnf->mtu6;
4999         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5000         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5001         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5002         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5003         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5004         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5005                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5006         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5007                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5008         array[DEVCONF_RTR_SOLICIT_DELAY] =
5009                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5010         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5011         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5012                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5013         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5014                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5015         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5016         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5017         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5018         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5019         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5020         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5021         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5022         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5023         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5024 #ifdef CONFIG_IPV6_ROUTER_PREF
5025         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5026         array[DEVCONF_RTR_PROBE_INTERVAL] =
5027                 jiffies_to_msecs(cnf->rtr_probe_interval);
5028 #ifdef CONFIG_IPV6_ROUTE_INFO
5029         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5030         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5031 #endif
5032 #endif
5033         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5034         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5035 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5036         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5037         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5038 #endif
5039 #ifdef CONFIG_IPV6_MROUTE
5040         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5041 #endif
5042         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5043         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5044         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5045         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5046         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5047         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5048         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5049         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5050         /* we omit DEVCONF_STABLE_SECRET for now */
5051         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5052         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5053         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5054         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5055         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5056 #ifdef CONFIG_IPV6_SEG6_HMAC
5057         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5058 #endif
5059         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5060         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5061         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5062         array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5063 }
5064
5065 static inline size_t inet6_ifla6_size(void)
5066 {
5067         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5068              + nla_total_size(sizeof(struct ifla_cacheinfo))
5069              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5070              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5071              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5072              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5073 }
5074
5075 static inline size_t inet6_if_nlmsg_size(void)
5076 {
5077         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5078                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5079                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5080                + nla_total_size(4) /* IFLA_MTU */
5081                + nla_total_size(4) /* IFLA_LINK */
5082                + nla_total_size(1) /* IFLA_OPERSTATE */
5083                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5084 }
5085
5086 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5087                                         int bytes)
5088 {
5089         int i;
5090         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5091         BUG_ON(pad < 0);
5092
5093         /* Use put_unaligned() because stats may not be aligned for u64. */
5094         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5095         for (i = 1; i < ICMP6_MIB_MAX; i++)
5096                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5097
5098         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5099 }
5100
5101 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5102                                         int bytes, size_t syncpoff)
5103 {
5104         int i, c;
5105         u64 buff[IPSTATS_MIB_MAX];
5106         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5107
5108         BUG_ON(pad < 0);
5109
5110         memset(buff, 0, sizeof(buff));
5111         buff[0] = IPSTATS_MIB_MAX;
5112
5113         for_each_possible_cpu(c) {
5114                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5115                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5116         }
5117
5118         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5119         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5120 }
5121
5122 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5123                              int bytes)
5124 {
5125         switch (attrtype) {
5126         case IFLA_INET6_STATS:
5127                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5128                                      offsetof(struct ipstats_mib, syncp));
5129                 break;
5130         case IFLA_INET6_ICMP6STATS:
5131                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5132                 break;
5133         }
5134 }
5135
5136 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5137                                   u32 ext_filter_mask)
5138 {
5139         struct nlattr *nla;
5140         struct ifla_cacheinfo ci;
5141
5142         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5143                 goto nla_put_failure;
5144         ci.max_reasm_len = IPV6_MAXPLEN;
5145         ci.tstamp = cstamp_delta(idev->tstamp);
5146         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5147         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5148         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5149                 goto nla_put_failure;
5150         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5151         if (!nla)
5152                 goto nla_put_failure;
5153         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5154
5155         /* XXX - MC not implemented */
5156
5157         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5158                 return 0;
5159
5160         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5161         if (!nla)
5162                 goto nla_put_failure;
5163         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5164
5165         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5166         if (!nla)
5167                 goto nla_put_failure;
5168         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5169
5170         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5171         if (!nla)
5172                 goto nla_put_failure;
5173
5174         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5175                 goto nla_put_failure;
5176
5177         read_lock_bh(&idev->lock);
5178         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5179         read_unlock_bh(&idev->lock);
5180
5181         return 0;
5182
5183 nla_put_failure:
5184         return -EMSGSIZE;
5185 }
5186
5187 static size_t inet6_get_link_af_size(const struct net_device *dev,
5188                                      u32 ext_filter_mask)
5189 {
5190         if (!__in6_dev_get(dev))
5191                 return 0;
5192
5193         return inet6_ifla6_size();
5194 }
5195
5196 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5197                               u32 ext_filter_mask)
5198 {
5199         struct inet6_dev *idev = __in6_dev_get(dev);
5200
5201         if (!idev)
5202                 return -ENODATA;
5203
5204         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5205                 return -EMSGSIZE;
5206
5207         return 0;
5208 }
5209
5210 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5211 {
5212         struct inet6_ifaddr *ifp;
5213         struct net_device *dev = idev->dev;
5214         bool clear_token, update_rs = false;
5215         struct in6_addr ll_addr;
5216
5217         ASSERT_RTNL();
5218
5219         if (!token)
5220                 return -EINVAL;
5221         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5222                 return -EINVAL;
5223         if (!ipv6_accept_ra(idev))
5224                 return -EINVAL;
5225         if (idev->cnf.rtr_solicits == 0)
5226                 return -EINVAL;
5227
5228         write_lock_bh(&idev->lock);
5229
5230         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5231         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5232
5233         write_unlock_bh(&idev->lock);
5234
5235         clear_token = ipv6_addr_any(token);
5236         if (clear_token)
5237                 goto update_lft;
5238
5239         if (!idev->dead && (idev->if_flags & IF_READY) &&
5240             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5241                              IFA_F_OPTIMISTIC)) {
5242                 /* If we're not ready, then normal ifup will take care
5243                  * of this. Otherwise, we need to request our rs here.
5244                  */
5245                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5246                 update_rs = true;
5247         }
5248
5249 update_lft:
5250         write_lock_bh(&idev->lock);
5251
5252         if (update_rs) {
5253                 idev->if_flags |= IF_RS_SENT;
5254                 idev->rs_interval = rfc3315_s14_backoff_init(
5255                         idev->cnf.rtr_solicit_interval);
5256                 idev->rs_probes = 1;
5257                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5258         }
5259
5260         /* Well, that's kinda nasty ... */
5261         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5262                 spin_lock(&ifp->lock);
5263                 if (ifp->tokenized) {
5264                         ifp->valid_lft = 0;
5265                         ifp->prefered_lft = 0;
5266                 }
5267                 spin_unlock(&ifp->lock);
5268         }
5269
5270         write_unlock_bh(&idev->lock);
5271         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5272         addrconf_verify_rtnl();
5273         return 0;
5274 }
5275
5276 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5277         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5278         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5279 };
5280
5281 static int inet6_validate_link_af(const struct net_device *dev,
5282                                   const struct nlattr *nla)
5283 {
5284         struct nlattr *tb[IFLA_INET6_MAX + 1];
5285
5286         if (dev && !__in6_dev_get(dev))
5287                 return -EAFNOSUPPORT;
5288
5289         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5290                                 NULL);
5291 }
5292
5293 static int check_addr_gen_mode(int mode)
5294 {
5295         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5296             mode != IN6_ADDR_GEN_MODE_NONE &&
5297             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5298             mode != IN6_ADDR_GEN_MODE_RANDOM)
5299                 return -EINVAL;
5300         return 1;
5301 }
5302
5303 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5304                                 int mode)
5305 {
5306         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5307             !idev->cnf.stable_secret.initialized &&
5308             !net->ipv6.devconf_dflt->stable_secret.initialized)
5309                 return -EINVAL;
5310         return 1;
5311 }
5312
5313 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5314 {
5315         int err = -EINVAL;
5316         struct inet6_dev *idev = __in6_dev_get(dev);
5317         struct nlattr *tb[IFLA_INET6_MAX + 1];
5318
5319         if (!idev)
5320                 return -EAFNOSUPPORT;
5321
5322         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5323                 BUG();
5324
5325         if (tb[IFLA_INET6_TOKEN]) {
5326                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5327                 if (err)
5328                         return err;
5329         }
5330
5331         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5332                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5333
5334                 if (check_addr_gen_mode(mode) < 0 ||
5335                     check_stable_privacy(idev, dev_net(dev), mode) < 0)
5336                         return -EINVAL;
5337
5338                 idev->cnf.addr_gen_mode = mode;
5339                 err = 0;
5340         }
5341
5342         return err;
5343 }
5344
5345 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5346                              u32 portid, u32 seq, int event, unsigned int flags)
5347 {
5348         struct net_device *dev = idev->dev;
5349         struct ifinfomsg *hdr;
5350         struct nlmsghdr *nlh;
5351         void *protoinfo;
5352
5353         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5354         if (!nlh)
5355                 return -EMSGSIZE;
5356
5357         hdr = nlmsg_data(nlh);
5358         hdr->ifi_family = AF_INET6;
5359         hdr->__ifi_pad = 0;
5360         hdr->ifi_type = dev->type;
5361         hdr->ifi_index = dev->ifindex;
5362         hdr->ifi_flags = dev_get_flags(dev);
5363         hdr->ifi_change = 0;
5364
5365         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5366             (dev->addr_len &&
5367              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5368             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5369             (dev->ifindex != dev_get_iflink(dev) &&
5370              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5371             nla_put_u8(skb, IFLA_OPERSTATE,
5372                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5373                 goto nla_put_failure;
5374         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5375         if (!protoinfo)
5376                 goto nla_put_failure;
5377
5378         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5379                 goto nla_put_failure;
5380
5381         nla_nest_end(skb, protoinfo);
5382         nlmsg_end(skb, nlh);
5383         return 0;
5384
5385 nla_put_failure:
5386         nlmsg_cancel(skb, nlh);
5387         return -EMSGSIZE;
5388 }
5389
5390 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5391 {
5392         struct net *net = sock_net(skb->sk);
5393         int h, s_h;
5394         int idx = 0, s_idx;
5395         struct net_device *dev;
5396         struct inet6_dev *idev;
5397         struct hlist_head *head;
5398
5399         s_h = cb->args[0];
5400         s_idx = cb->args[1];
5401
5402         rcu_read_lock();
5403         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5404                 idx = 0;
5405                 head = &net->dev_index_head[h];
5406                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5407                         if (idx < s_idx)
5408                                 goto cont;
5409                         idev = __in6_dev_get(dev);
5410                         if (!idev)
5411                                 goto cont;
5412                         if (inet6_fill_ifinfo(skb, idev,
5413                                               NETLINK_CB(cb->skb).portid,
5414                                               cb->nlh->nlmsg_seq,
5415                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5416                                 goto out;
5417 cont:
5418                         idx++;
5419                 }
5420         }
5421 out:
5422         rcu_read_unlock();
5423         cb->args[1] = idx;
5424         cb->args[0] = h;
5425
5426         return skb->len;
5427 }
5428
5429 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5430 {
5431         struct sk_buff *skb;
5432         struct net *net = dev_net(idev->dev);
5433         int err = -ENOBUFS;
5434
5435         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5436         if (!skb)
5437                 goto errout;
5438
5439         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5440         if (err < 0) {
5441                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5442                 WARN_ON(err == -EMSGSIZE);
5443                 kfree_skb(skb);
5444                 goto errout;
5445         }
5446         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5447         return;
5448 errout:
5449         if (err < 0)
5450                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5451 }
5452
5453 static inline size_t inet6_prefix_nlmsg_size(void)
5454 {
5455         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5456                + nla_total_size(sizeof(struct in6_addr))
5457                + nla_total_size(sizeof(struct prefix_cacheinfo));
5458 }
5459
5460 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5461                              struct prefix_info *pinfo, u32 portid, u32 seq,
5462                              int event, unsigned int flags)
5463 {
5464         struct prefixmsg *pmsg;
5465         struct nlmsghdr *nlh;
5466         struct prefix_cacheinfo ci;
5467
5468         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5469         if (!nlh)
5470                 return -EMSGSIZE;
5471
5472         pmsg = nlmsg_data(nlh);
5473         pmsg->prefix_family = AF_INET6;
5474         pmsg->prefix_pad1 = 0;
5475         pmsg->prefix_pad2 = 0;
5476         pmsg->prefix_ifindex = idev->dev->ifindex;
5477         pmsg->prefix_len = pinfo->prefix_len;
5478         pmsg->prefix_type = pinfo->type;
5479         pmsg->prefix_pad3 = 0;
5480         pmsg->prefix_flags = 0;
5481         if (pinfo->onlink)
5482                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5483         if (pinfo->autoconf)
5484                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5485
5486         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5487                 goto nla_put_failure;
5488         ci.preferred_time = ntohl(pinfo->prefered);
5489         ci.valid_time = ntohl(pinfo->valid);
5490         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5491                 goto nla_put_failure;
5492         nlmsg_end(skb, nlh);
5493         return 0;
5494
5495 nla_put_failure:
5496         nlmsg_cancel(skb, nlh);
5497         return -EMSGSIZE;
5498 }
5499
5500 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5501                          struct prefix_info *pinfo)
5502 {
5503         struct sk_buff *skb;
5504         struct net *net = dev_net(idev->dev);
5505         int err = -ENOBUFS;
5506
5507         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5508         if (!skb)
5509                 goto errout;
5510
5511         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5512         if (err < 0) {
5513                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5514                 WARN_ON(err == -EMSGSIZE);
5515                 kfree_skb(skb);
5516                 goto errout;
5517         }
5518         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5519         return;
5520 errout:
5521         if (err < 0)
5522                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5523 }
5524
5525 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5526 {
5527         struct net *net = dev_net(ifp->idev->dev);
5528
5529         if (event)
5530                 ASSERT_RTNL();
5531
5532         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5533
5534         switch (event) {
5535         case RTM_NEWADDR:
5536                 /*
5537                  * If the address was optimistic
5538                  * we inserted the route at the start of
5539                  * our DAD process, so we don't need
5540                  * to do it again
5541                  */
5542                 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5543                         ip6_ins_rt(ifp->rt);
5544                 if (ifp->idev->cnf.forwarding)
5545                         addrconf_join_anycast(ifp);
5546                 if (!ipv6_addr_any(&ifp->peer_addr))
5547                         addrconf_prefix_route(&ifp->peer_addr, 128,
5548                                               ifp->idev->dev, 0, 0);
5549                 break;
5550         case RTM_DELADDR:
5551                 if (ifp->idev->cnf.forwarding)
5552                         addrconf_leave_anycast(ifp);
5553                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5554                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5555                         struct rt6_info *rt;
5556
5557                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5558                                                        ifp->idev->dev, 0, 0);
5559                         if (rt)
5560                                 ip6_del_rt(rt);
5561                 }
5562                 if (ifp->rt) {
5563                         if (dst_hold_safe(&ifp->rt->dst))
5564                                 ip6_del_rt(ifp->rt);
5565                 }
5566                 rt_genid_bump_ipv6(net);
5567                 break;
5568         }
5569         atomic_inc(&net->ipv6.dev_addr_genid);
5570 }
5571
5572 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5573 {
5574         rcu_read_lock_bh();
5575         if (likely(ifp->idev->dead == 0))
5576                 __ipv6_ifa_notify(event, ifp);
5577         rcu_read_unlock_bh();
5578 }
5579
5580 #ifdef CONFIG_SYSCTL
5581
5582 static
5583 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5584                            void __user *buffer, size_t *lenp, loff_t *ppos)
5585 {
5586         int *valp = ctl->data;
5587         int val = *valp;
5588         loff_t pos = *ppos;
5589         struct ctl_table lctl;
5590         int ret;
5591
5592         /*
5593          * ctl->data points to idev->cnf.forwarding, we should
5594          * not modify it until we get the rtnl lock.
5595          */
5596         lctl = *ctl;
5597         lctl.data = &val;
5598
5599         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5600
5601         if (write)
5602                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5603         if (ret)
5604                 *ppos = pos;
5605         return ret;
5606 }
5607
5608 static
5609 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5610                         void __user *buffer, size_t *lenp, loff_t *ppos)
5611 {
5612         struct inet6_dev *idev = ctl->extra1;
5613         int min_mtu = IPV6_MIN_MTU;
5614         struct ctl_table lctl;
5615
5616         lctl = *ctl;
5617         lctl.extra1 = &min_mtu;
5618         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5619
5620         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5621 }
5622
5623 static void dev_disable_change(struct inet6_dev *idev)
5624 {
5625         struct netdev_notifier_info info;
5626
5627         if (!idev || !idev->dev)
5628                 return;
5629
5630         netdev_notifier_info_init(&info, idev->dev);
5631         if (idev->cnf.disable_ipv6)
5632                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5633         else
5634                 addrconf_notify(NULL, NETDEV_UP, &info);
5635 }
5636
5637 static void addrconf_disable_change(struct net *net, __s32 newf)
5638 {
5639         struct net_device *dev;
5640         struct inet6_dev *idev;
5641
5642         for_each_netdev(net, dev) {
5643                 idev = __in6_dev_get(dev);
5644                 if (idev) {
5645                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5646                         idev->cnf.disable_ipv6 = newf;
5647                         if (changed)
5648                                 dev_disable_change(idev);
5649                 }
5650         }
5651 }
5652
5653 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5654 {
5655         struct net *net;
5656         int old;
5657
5658         if (!rtnl_trylock())
5659                 return restart_syscall();
5660
5661         net = (struct net *)table->extra2;
5662         old = *p;
5663         *p = newf;
5664
5665         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5666                 rtnl_unlock();
5667                 return 0;
5668         }
5669
5670         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5671                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5672                 addrconf_disable_change(net, newf);
5673         } else if ((!newf) ^ (!old))
5674                 dev_disable_change((struct inet6_dev *)table->extra1);
5675
5676         rtnl_unlock();
5677         return 0;
5678 }
5679
5680 static
5681 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5682                             void __user *buffer, size_t *lenp, loff_t *ppos)
5683 {
5684         int *valp = ctl->data;
5685         int val = *valp;
5686         loff_t pos = *ppos;
5687         struct ctl_table lctl;
5688         int ret;
5689
5690         /*
5691          * ctl->data points to idev->cnf.disable_ipv6, we should
5692          * not modify it until we get the rtnl lock.
5693          */
5694         lctl = *ctl;
5695         lctl.data = &val;
5696
5697         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5698
5699         if (write)
5700                 ret = addrconf_disable_ipv6(ctl, valp, val);
5701         if (ret)
5702                 *ppos = pos;
5703         return ret;
5704 }
5705
5706 static
5707 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5708                               void __user *buffer, size_t *lenp, loff_t *ppos)
5709 {
5710         int *valp = ctl->data;
5711         int ret;
5712         int old, new;
5713
5714         old = *valp;
5715         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5716         new = *valp;
5717
5718         if (write && old != new) {
5719                 struct net *net = ctl->extra2;
5720
5721                 if (!rtnl_trylock())
5722                         return restart_syscall();
5723
5724                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5725                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5726                                                      NETCONFA_PROXY_NEIGH,
5727                                                      NETCONFA_IFINDEX_DEFAULT,
5728                                                      net->ipv6.devconf_dflt);
5729                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5730                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5731                                                      NETCONFA_PROXY_NEIGH,
5732                                                      NETCONFA_IFINDEX_ALL,
5733                                                      net->ipv6.devconf_all);
5734                 else {
5735                         struct inet6_dev *idev = ctl->extra1;
5736
5737                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5738                                                      NETCONFA_PROXY_NEIGH,
5739                                                      idev->dev->ifindex,
5740                                                      &idev->cnf);
5741                 }
5742                 rtnl_unlock();
5743         }
5744
5745         return ret;
5746 }
5747
5748 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5749                                          void __user *buffer, size_t *lenp,
5750                                          loff_t *ppos)
5751 {
5752         int ret = 0;
5753         int new_val;
5754         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5755         struct net *net = (struct net *)ctl->extra2;
5756
5757         if (!rtnl_trylock())
5758                 return restart_syscall();
5759
5760         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5761
5762         if (write) {
5763                 new_val = *((int *)ctl->data);
5764
5765                 if (check_addr_gen_mode(new_val) < 0) {
5766                         ret = -EINVAL;
5767                         goto out;
5768                 }
5769
5770                 /* request for default */
5771                 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5772                         ipv6_devconf_dflt.addr_gen_mode = new_val;
5773
5774                 /* request for individual net device */
5775                 } else {
5776                         if (!idev)
5777                                 goto out;
5778
5779                         if (check_stable_privacy(idev, net, new_val) < 0) {
5780                                 ret = -EINVAL;
5781                                 goto out;
5782                         }
5783
5784                         if (idev->cnf.addr_gen_mode != new_val) {
5785                                 idev->cnf.addr_gen_mode = new_val;
5786                                 addrconf_dev_config(idev->dev);
5787                         }
5788                 }
5789         }
5790
5791 out:
5792         rtnl_unlock();
5793
5794         return ret;
5795 }
5796
5797 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5798                                          void __user *buffer, size_t *lenp,
5799                                          loff_t *ppos)
5800 {
5801         int err;
5802         struct in6_addr addr;
5803         char str[IPV6_MAX_STRLEN];
5804         struct ctl_table lctl = *ctl;
5805         struct net *net = ctl->extra2;
5806         struct ipv6_stable_secret *secret = ctl->data;
5807
5808         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5809                 return -EIO;
5810
5811         lctl.maxlen = IPV6_MAX_STRLEN;
5812         lctl.data = str;
5813
5814         if (!rtnl_trylock())
5815                 return restart_syscall();
5816
5817         if (!write && !secret->initialized) {
5818                 err = -EIO;
5819                 goto out;
5820         }
5821
5822         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5823         if (err >= sizeof(str)) {
5824                 err = -EIO;
5825                 goto out;
5826         }
5827
5828         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5829         if (err || !write)
5830                 goto out;
5831
5832         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5833                 err = -EIO;
5834                 goto out;
5835         }
5836
5837         secret->initialized = true;
5838         secret->secret = addr;
5839
5840         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5841                 struct net_device *dev;
5842
5843                 for_each_netdev(net, dev) {
5844                         struct inet6_dev *idev = __in6_dev_get(dev);
5845
5846                         if (idev) {
5847                                 idev->cnf.addr_gen_mode =
5848                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5849                         }
5850                 }
5851         } else {
5852                 struct inet6_dev *idev = ctl->extra1;
5853
5854                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5855         }
5856
5857 out:
5858         rtnl_unlock();
5859
5860         return err;
5861 }
5862
5863 static
5864 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5865                                                 int write,
5866                                                 void __user *buffer,
5867                                                 size_t *lenp,
5868                                                 loff_t *ppos)
5869 {
5870         int *valp = ctl->data;
5871         int val = *valp;
5872         loff_t pos = *ppos;
5873         struct ctl_table lctl;
5874         int ret;
5875
5876         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5877          * we should not modify it until we get the rtnl lock.
5878          */
5879         lctl = *ctl;
5880         lctl.data = &val;
5881
5882         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5883
5884         if (write)
5885                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5886         if (ret)
5887                 *ppos = pos;
5888         return ret;
5889 }
5890
5891 static
5892 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5893 {
5894         if (rt) {
5895                 if (action)
5896                         rt->dst.flags |= DST_NOPOLICY;
5897                 else
5898                         rt->dst.flags &= ~DST_NOPOLICY;
5899         }
5900 }
5901
5902 static
5903 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5904 {
5905         struct inet6_ifaddr *ifa;
5906
5907         read_lock_bh(&idev->lock);
5908         list_for_each_entry(ifa, &idev->addr_list, if_list) {
5909                 spin_lock(&ifa->lock);
5910                 if (ifa->rt) {
5911                         struct rt6_info *rt = ifa->rt;
5912                         int cpu;
5913
5914                         rcu_read_lock();
5915                         addrconf_set_nopolicy(ifa->rt, val);
5916                         if (rt->rt6i_pcpu) {
5917                                 for_each_possible_cpu(cpu) {
5918                                         struct rt6_info **rtp;
5919
5920                                         rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5921                                         addrconf_set_nopolicy(*rtp, val);
5922                                 }
5923                         }
5924                         rcu_read_unlock();
5925                 }
5926                 spin_unlock(&ifa->lock);
5927         }
5928         read_unlock_bh(&idev->lock);
5929 }
5930
5931 static
5932 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5933 {
5934         struct inet6_dev *idev;
5935         struct net *net;
5936
5937         if (!rtnl_trylock())
5938                 return restart_syscall();
5939
5940         *valp = val;
5941
5942         net = (struct net *)ctl->extra2;
5943         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5944                 rtnl_unlock();
5945                 return 0;
5946         }
5947
5948         if (valp == &net->ipv6.devconf_all->disable_policy)  {
5949                 struct net_device *dev;
5950
5951                 for_each_netdev(net, dev) {
5952                         idev = __in6_dev_get(dev);
5953                         if (idev)
5954                                 addrconf_disable_policy_idev(idev, val);
5955                 }
5956         } else {
5957                 idev = (struct inet6_dev *)ctl->extra1;
5958                 addrconf_disable_policy_idev(idev, val);
5959         }
5960
5961         rtnl_unlock();
5962         return 0;
5963 }
5964
5965 static
5966 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5967                                    void __user *buffer, size_t *lenp,
5968                                    loff_t *ppos)
5969 {
5970         int *valp = ctl->data;
5971         int val = *valp;
5972         loff_t pos = *ppos;
5973         struct ctl_table lctl;
5974         int ret;
5975
5976         lctl = *ctl;
5977         lctl.data = &val;
5978         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5979
5980         if (write && (*valp != val))
5981                 ret = addrconf_disable_policy(ctl, valp, val);
5982
5983         if (ret)
5984                 *ppos = pos;
5985
5986         return ret;
5987 }
5988
5989 static int minus_one = -1;
5990 static const int zero = 0;
5991 static const int one = 1;
5992 static const int two_five_five = 255;
5993
5994 static const struct ctl_table addrconf_sysctl[] = {
5995         {
5996                 .procname       = "forwarding",
5997                 .data           = &ipv6_devconf.forwarding,
5998                 .maxlen         = sizeof(int),
5999                 .mode           = 0644,
6000                 .proc_handler   = addrconf_sysctl_forward,
6001         },
6002         {
6003                 .procname       = "hop_limit",
6004                 .data           = &ipv6_devconf.hop_limit,
6005                 .maxlen         = sizeof(int),
6006                 .mode           = 0644,
6007                 .proc_handler   = proc_dointvec_minmax,
6008                 .extra1         = (void *)&one,
6009                 .extra2         = (void *)&two_five_five,
6010         },
6011         {
6012                 .procname       = "mtu",
6013                 .data           = &ipv6_devconf.mtu6,
6014                 .maxlen         = sizeof(int),
6015                 .mode           = 0644,
6016                 .proc_handler   = addrconf_sysctl_mtu,
6017         },
6018         {
6019                 .procname       = "accept_ra",
6020                 .data           = &ipv6_devconf.accept_ra,
6021                 .maxlen         = sizeof(int),
6022                 .mode           = 0644,
6023                 .proc_handler   = proc_dointvec,
6024         },
6025         {
6026                 .procname       = "accept_redirects",
6027                 .data           = &ipv6_devconf.accept_redirects,
6028                 .maxlen         = sizeof(int),
6029                 .mode           = 0644,
6030                 .proc_handler   = proc_dointvec,
6031         },
6032         {
6033                 .procname       = "autoconf",
6034                 .data           = &ipv6_devconf.autoconf,
6035                 .maxlen         = sizeof(int),
6036                 .mode           = 0644,
6037                 .proc_handler   = proc_dointvec,
6038         },
6039         {
6040                 .procname       = "dad_transmits",
6041                 .data           = &ipv6_devconf.dad_transmits,
6042                 .maxlen         = sizeof(int),
6043                 .mode           = 0644,
6044                 .proc_handler   = proc_dointvec,
6045         },
6046         {
6047                 .procname       = "router_solicitations",
6048                 .data           = &ipv6_devconf.rtr_solicits,
6049                 .maxlen         = sizeof(int),
6050                 .mode           = 0644,
6051                 .proc_handler   = proc_dointvec_minmax,
6052                 .extra1         = &minus_one,
6053         },
6054         {
6055                 .procname       = "router_solicitation_interval",
6056                 .data           = &ipv6_devconf.rtr_solicit_interval,
6057                 .maxlen         = sizeof(int),
6058                 .mode           = 0644,
6059                 .proc_handler   = proc_dointvec_jiffies,
6060         },
6061         {
6062                 .procname       = "router_solicitation_max_interval",
6063                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6064                 .maxlen         = sizeof(int),
6065                 .mode           = 0644,
6066                 .proc_handler   = proc_dointvec_jiffies,
6067         },
6068         {
6069                 .procname       = "router_solicitation_delay",
6070                 .data           = &ipv6_devconf.rtr_solicit_delay,
6071                 .maxlen         = sizeof(int),
6072                 .mode           = 0644,
6073                 .proc_handler   = proc_dointvec_jiffies,
6074         },
6075         {
6076                 .procname       = "force_mld_version",
6077                 .data           = &ipv6_devconf.force_mld_version,
6078                 .maxlen         = sizeof(int),
6079                 .mode           = 0644,
6080                 .proc_handler   = proc_dointvec,
6081         },
6082         {
6083                 .procname       = "mldv1_unsolicited_report_interval",
6084                 .data           =
6085                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6086                 .maxlen         = sizeof(int),
6087                 .mode           = 0644,
6088                 .proc_handler   = proc_dointvec_ms_jiffies,
6089         },
6090         {
6091                 .procname       = "mldv2_unsolicited_report_interval",
6092                 .data           =
6093                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6094                 .maxlen         = sizeof(int),
6095                 .mode           = 0644,
6096                 .proc_handler   = proc_dointvec_ms_jiffies,
6097         },
6098         {
6099                 .procname       = "use_tempaddr",
6100                 .data           = &ipv6_devconf.use_tempaddr,
6101                 .maxlen         = sizeof(int),
6102                 .mode           = 0644,
6103                 .proc_handler   = proc_dointvec,
6104         },
6105         {
6106                 .procname       = "temp_valid_lft",
6107                 .data           = &ipv6_devconf.temp_valid_lft,
6108                 .maxlen         = sizeof(int),
6109                 .mode           = 0644,
6110                 .proc_handler   = proc_dointvec,
6111         },
6112         {
6113                 .procname       = "temp_prefered_lft",
6114                 .data           = &ipv6_devconf.temp_prefered_lft,
6115                 .maxlen         = sizeof(int),
6116                 .mode           = 0644,
6117                 .proc_handler   = proc_dointvec,
6118         },
6119         {
6120                 .procname       = "regen_max_retry",
6121                 .data           = &ipv6_devconf.regen_max_retry,
6122                 .maxlen         = sizeof(int),
6123                 .mode           = 0644,
6124                 .proc_handler   = proc_dointvec,
6125         },
6126         {
6127                 .procname       = "max_desync_factor",
6128                 .data           = &ipv6_devconf.max_desync_factor,
6129                 .maxlen         = sizeof(int),
6130                 .mode           = 0644,
6131                 .proc_handler   = proc_dointvec,
6132         },
6133         {
6134                 .procname       = "max_addresses",
6135                 .data           = &ipv6_devconf.max_addresses,
6136                 .maxlen         = sizeof(int),
6137                 .mode           = 0644,
6138                 .proc_handler   = proc_dointvec,
6139         },
6140         {
6141                 .procname       = "accept_ra_defrtr",
6142                 .data           = &ipv6_devconf.accept_ra_defrtr,
6143                 .maxlen         = sizeof(int),
6144                 .mode           = 0644,
6145                 .proc_handler   = proc_dointvec,
6146         },
6147         {
6148                 .procname       = "accept_ra_min_hop_limit",
6149                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6150                 .maxlen         = sizeof(int),
6151                 .mode           = 0644,
6152                 .proc_handler   = proc_dointvec,
6153         },
6154         {
6155                 .procname       = "accept_ra_pinfo",
6156                 .data           = &ipv6_devconf.accept_ra_pinfo,
6157                 .maxlen         = sizeof(int),
6158                 .mode           = 0644,
6159                 .proc_handler   = proc_dointvec,
6160         },
6161 #ifdef CONFIG_IPV6_ROUTER_PREF
6162         {
6163                 .procname       = "accept_ra_rtr_pref",
6164                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6165                 .maxlen         = sizeof(int),
6166                 .mode           = 0644,
6167                 .proc_handler   = proc_dointvec,
6168         },
6169         {
6170                 .procname       = "router_probe_interval",
6171                 .data           = &ipv6_devconf.rtr_probe_interval,
6172                 .maxlen         = sizeof(int),
6173                 .mode           = 0644,
6174                 .proc_handler   = proc_dointvec_jiffies,
6175         },
6176 #ifdef CONFIG_IPV6_ROUTE_INFO
6177         {
6178                 .procname       = "accept_ra_rt_info_min_plen",
6179                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6180                 .maxlen         = sizeof(int),
6181                 .mode           = 0644,
6182                 .proc_handler   = proc_dointvec,
6183         },
6184         {
6185                 .procname       = "accept_ra_rt_info_max_plen",
6186                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6187                 .maxlen         = sizeof(int),
6188                 .mode           = 0644,
6189                 .proc_handler   = proc_dointvec,
6190         },
6191 #endif
6192 #endif
6193         {
6194                 .procname       = "proxy_ndp",
6195                 .data           = &ipv6_devconf.proxy_ndp,
6196                 .maxlen         = sizeof(int),
6197                 .mode           = 0644,
6198                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6199         },
6200         {
6201                 .procname       = "accept_source_route",
6202                 .data           = &ipv6_devconf.accept_source_route,
6203                 .maxlen         = sizeof(int),
6204                 .mode           = 0644,
6205                 .proc_handler   = proc_dointvec,
6206         },
6207 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6208         {
6209                 .procname       = "optimistic_dad",
6210                 .data           = &ipv6_devconf.optimistic_dad,
6211                 .maxlen         = sizeof(int),
6212                 .mode           = 0644,
6213                 .proc_handler   = proc_dointvec,
6214         },
6215         {
6216                 .procname       = "use_optimistic",
6217                 .data           = &ipv6_devconf.use_optimistic,
6218                 .maxlen         = sizeof(int),
6219                 .mode           = 0644,
6220                 .proc_handler   = proc_dointvec,
6221         },
6222 #endif
6223 #ifdef CONFIG_IPV6_MROUTE
6224         {
6225                 .procname       = "mc_forwarding",
6226                 .data           = &ipv6_devconf.mc_forwarding,
6227                 .maxlen         = sizeof(int),
6228                 .mode           = 0444,
6229                 .proc_handler   = proc_dointvec,
6230         },
6231 #endif
6232         {
6233                 .procname       = "disable_ipv6",
6234                 .data           = &ipv6_devconf.disable_ipv6,
6235                 .maxlen         = sizeof(int),
6236                 .mode           = 0644,
6237                 .proc_handler   = addrconf_sysctl_disable,
6238         },
6239         {
6240                 .procname       = "accept_dad",
6241                 .data           = &ipv6_devconf.accept_dad,
6242                 .maxlen         = sizeof(int),
6243                 .mode           = 0644,
6244                 .proc_handler   = proc_dointvec,
6245         },
6246         {
6247                 .procname       = "force_tllao",
6248                 .data           = &ipv6_devconf.force_tllao,
6249                 .maxlen         = sizeof(int),
6250                 .mode           = 0644,
6251                 .proc_handler   = proc_dointvec
6252         },
6253         {
6254                 .procname       = "ndisc_notify",
6255                 .data           = &ipv6_devconf.ndisc_notify,
6256                 .maxlen         = sizeof(int),
6257                 .mode           = 0644,
6258                 .proc_handler   = proc_dointvec
6259         },
6260         {
6261                 .procname       = "suppress_frag_ndisc",
6262                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6263                 .maxlen         = sizeof(int),
6264                 .mode           = 0644,
6265                 .proc_handler   = proc_dointvec
6266         },
6267         {
6268                 .procname       = "accept_ra_from_local",
6269                 .data           = &ipv6_devconf.accept_ra_from_local,
6270                 .maxlen         = sizeof(int),
6271                 .mode           = 0644,
6272                 .proc_handler   = proc_dointvec,
6273         },
6274         {
6275                 .procname       = "accept_ra_mtu",
6276                 .data           = &ipv6_devconf.accept_ra_mtu,
6277                 .maxlen         = sizeof(int),
6278                 .mode           = 0644,
6279                 .proc_handler   = proc_dointvec,
6280         },
6281         {
6282                 .procname       = "stable_secret",
6283                 .data           = &ipv6_devconf.stable_secret,
6284                 .maxlen         = IPV6_MAX_STRLEN,
6285                 .mode           = 0600,
6286                 .proc_handler   = addrconf_sysctl_stable_secret,
6287         },
6288         {
6289                 .procname       = "use_oif_addrs_only",
6290                 .data           = &ipv6_devconf.use_oif_addrs_only,
6291                 .maxlen         = sizeof(int),
6292                 .mode           = 0644,
6293                 .proc_handler   = proc_dointvec,
6294         },
6295         {
6296                 .procname       = "ignore_routes_with_linkdown",
6297                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6298                 .maxlen         = sizeof(int),
6299                 .mode           = 0644,
6300                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6301         },
6302         {
6303                 .procname       = "drop_unicast_in_l2_multicast",
6304                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6305                 .maxlen         = sizeof(int),
6306                 .mode           = 0644,
6307                 .proc_handler   = proc_dointvec,
6308         },
6309         {
6310                 .procname       = "drop_unsolicited_na",
6311                 .data           = &ipv6_devconf.drop_unsolicited_na,
6312                 .maxlen         = sizeof(int),
6313                 .mode           = 0644,
6314                 .proc_handler   = proc_dointvec,
6315         },
6316         {
6317                 .procname       = "keep_addr_on_down",
6318                 .data           = &ipv6_devconf.keep_addr_on_down,
6319                 .maxlen         = sizeof(int),
6320                 .mode           = 0644,
6321                 .proc_handler   = proc_dointvec,
6322
6323         },
6324         {
6325                 .procname       = "seg6_enabled",
6326                 .data           = &ipv6_devconf.seg6_enabled,
6327                 .maxlen         = sizeof(int),
6328                 .mode           = 0644,
6329                 .proc_handler   = proc_dointvec,
6330         },
6331 #ifdef CONFIG_IPV6_SEG6_HMAC
6332         {
6333                 .procname       = "seg6_require_hmac",
6334                 .data           = &ipv6_devconf.seg6_require_hmac,
6335                 .maxlen         = sizeof(int),
6336                 .mode           = 0644,
6337                 .proc_handler   = proc_dointvec,
6338         },
6339 #endif
6340         {
6341                 .procname       = "enhanced_dad",
6342                 .data           = &ipv6_devconf.enhanced_dad,
6343                 .maxlen         = sizeof(int),
6344                 .mode           = 0644,
6345                 .proc_handler   = proc_dointvec,
6346         },
6347         {
6348                 .procname               = "addr_gen_mode",
6349                 .data                   = &ipv6_devconf.addr_gen_mode,
6350                 .maxlen                 = sizeof(int),
6351                 .mode                   = 0644,
6352                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6353         },
6354         {
6355                 .procname       = "disable_policy",
6356                 .data           = &ipv6_devconf.disable_policy,
6357                 .maxlen         = sizeof(int),
6358                 .mode           = 0644,
6359                 .proc_handler   = addrconf_sysctl_disable_policy,
6360         },
6361         {
6362                 .procname       = "ndisc_tclass",
6363                 .data           = &ipv6_devconf.ndisc_tclass,
6364                 .maxlen         = sizeof(int),
6365                 .mode           = 0644,
6366                 .proc_handler   = proc_dointvec_minmax,
6367                 .extra1         = (void *)&zero,
6368                 .extra2         = (void *)&two_five_five,
6369         },
6370         {
6371                 /* sentinel */
6372         }
6373 };
6374
6375 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6376                 struct inet6_dev *idev, struct ipv6_devconf *p)
6377 {
6378         int i, ifindex;
6379         struct ctl_table *table;
6380         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6381
6382         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6383         if (!table)
6384                 goto out;
6385
6386         for (i = 0; table[i].data; i++) {
6387                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6388                 /* If one of these is already set, then it is not safe to
6389                  * overwrite either of them: this makes proc_dointvec_minmax
6390                  * usable.
6391                  */
6392                 if (!table[i].extra1 && !table[i].extra2) {
6393                         table[i].extra1 = idev; /* embedded; no ref */
6394                         table[i].extra2 = net;
6395                 }
6396         }
6397
6398         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6399
6400         p->sysctl_header = register_net_sysctl(net, path, table);
6401         if (!p->sysctl_header)
6402                 goto free;
6403
6404         if (!strcmp(dev_name, "all"))
6405                 ifindex = NETCONFA_IFINDEX_ALL;
6406         else if (!strcmp(dev_name, "default"))
6407                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6408         else
6409                 ifindex = idev->dev->ifindex;
6410         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6411                                      ifindex, p);
6412         return 0;
6413
6414 free:
6415         kfree(table);
6416 out:
6417         return -ENOBUFS;
6418 }
6419
6420 static void __addrconf_sysctl_unregister(struct net *net,
6421                                          struct ipv6_devconf *p, int ifindex)
6422 {
6423         struct ctl_table *table;
6424
6425         if (!p->sysctl_header)
6426                 return;
6427
6428         table = p->sysctl_header->ctl_table_arg;
6429         unregister_net_sysctl_table(p->sysctl_header);
6430         p->sysctl_header = NULL;
6431         kfree(table);
6432
6433         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6434 }
6435
6436 static int addrconf_sysctl_register(struct inet6_dev *idev)
6437 {
6438         int err;
6439
6440         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6441                 return -EINVAL;
6442
6443         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6444                                     &ndisc_ifinfo_sysctl_change);
6445         if (err)
6446                 return err;
6447         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6448                                          idev, &idev->cnf);
6449         if (err)
6450                 neigh_sysctl_unregister(idev->nd_parms);
6451
6452         return err;
6453 }
6454
6455 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6456 {
6457         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6458                                      idev->dev->ifindex);
6459         neigh_sysctl_unregister(idev->nd_parms);
6460 }
6461
6462
6463 #endif
6464
6465 static int __net_init addrconf_init_net(struct net *net)
6466 {
6467         int err = -ENOMEM;
6468         struct ipv6_devconf *all, *dflt;
6469
6470         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6471         if (!all)
6472                 goto err_alloc_all;
6473
6474         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6475         if (!dflt)
6476                 goto err_alloc_dflt;
6477
6478         /* these will be inherited by all namespaces */
6479         dflt->autoconf = ipv6_defaults.autoconf;
6480         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6481
6482         dflt->stable_secret.initialized = false;
6483         all->stable_secret.initialized = false;
6484
6485         net->ipv6.devconf_all = all;
6486         net->ipv6.devconf_dflt = dflt;
6487
6488 #ifdef CONFIG_SYSCTL
6489         err = __addrconf_sysctl_register(net, "all", NULL, all);
6490         if (err < 0)
6491                 goto err_reg_all;
6492
6493         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6494         if (err < 0)
6495                 goto err_reg_dflt;
6496 #endif
6497         return 0;
6498
6499 #ifdef CONFIG_SYSCTL
6500 err_reg_dflt:
6501         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6502 err_reg_all:
6503         kfree(dflt);
6504 #endif
6505 err_alloc_dflt:
6506         kfree(all);
6507 err_alloc_all:
6508         return err;
6509 }
6510
6511 static void __net_exit addrconf_exit_net(struct net *net)
6512 {
6513 #ifdef CONFIG_SYSCTL
6514         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6515                                      NETCONFA_IFINDEX_DEFAULT);
6516         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6517                                      NETCONFA_IFINDEX_ALL);
6518 #endif
6519         kfree(net->ipv6.devconf_dflt);
6520         kfree(net->ipv6.devconf_all);
6521 }
6522
6523 static struct pernet_operations addrconf_ops = {
6524         .init = addrconf_init_net,
6525         .exit = addrconf_exit_net,
6526 };
6527
6528 static struct rtnl_af_ops inet6_ops __read_mostly = {
6529         .family           = AF_INET6,
6530         .fill_link_af     = inet6_fill_link_af,
6531         .get_link_af_size = inet6_get_link_af_size,
6532         .validate_link_af = inet6_validate_link_af,
6533         .set_link_af      = inet6_set_link_af,
6534 };
6535
6536 /*
6537  *      Init / cleanup code
6538  */
6539
6540 int __init addrconf_init(void)
6541 {
6542         struct inet6_dev *idev;
6543         int i, err;
6544
6545         err = ipv6_addr_label_init();
6546         if (err < 0) {
6547                 pr_crit("%s: cannot initialize default policy table: %d\n",
6548                         __func__, err);
6549                 goto out;
6550         }
6551
6552         err = register_pernet_subsys(&addrconf_ops);
6553         if (err < 0)
6554                 goto out_addrlabel;
6555
6556         addrconf_wq = create_workqueue("ipv6_addrconf");
6557         if (!addrconf_wq) {
6558                 err = -ENOMEM;
6559                 goto out_nowq;
6560         }
6561
6562         /* The addrconf netdev notifier requires that loopback_dev
6563          * has it's ipv6 private information allocated and setup
6564          * before it can bring up and give link-local addresses
6565          * to other devices which are up.
6566          *
6567          * Unfortunately, loopback_dev is not necessarily the first
6568          * entry in the global dev_base list of net devices.  In fact,
6569          * it is likely to be the very last entry on that list.
6570          * So this causes the notifier registry below to try and
6571          * give link-local addresses to all devices besides loopback_dev
6572          * first, then loopback_dev, which cases all the non-loopback_dev
6573          * devices to fail to get a link-local address.
6574          *
6575          * So, as a temporary fix, allocate the ipv6 structure for
6576          * loopback_dev first by hand.
6577          * Longer term, all of the dependencies ipv6 has upon the loopback
6578          * device and it being up should be removed.
6579          */
6580         rtnl_lock();
6581         idev = ipv6_add_dev(init_net.loopback_dev);
6582         rtnl_unlock();
6583         if (IS_ERR(idev)) {
6584                 err = PTR_ERR(idev);
6585                 goto errlo;
6586         }
6587
6588         ip6_route_init_special_entries();
6589
6590         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6591                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6592
6593         register_netdevice_notifier(&ipv6_dev_notf);
6594
6595         addrconf_verify();
6596
6597         rtnl_af_register(&inet6_ops);
6598
6599         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6600                               0);
6601         if (err < 0)
6602                 goto errout;
6603
6604         /* Only the first call to __rtnl_register can fail */
6605         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
6606         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
6607         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6608                         inet6_dump_ifaddr, RTNL_FLAG_DOIT_UNLOCKED);
6609         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6610                         inet6_dump_ifmcaddr, 0);
6611         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6612                         inet6_dump_ifacaddr, 0);
6613         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6614                         inet6_netconf_dump_devconf, RTNL_FLAG_DOIT_UNLOCKED);
6615
6616         ipv6_addr_label_rtnl_register();
6617
6618         return 0;
6619 errout:
6620         rtnl_af_unregister(&inet6_ops);
6621         unregister_netdevice_notifier(&ipv6_dev_notf);
6622 errlo:
6623         destroy_workqueue(addrconf_wq);
6624 out_nowq:
6625         unregister_pernet_subsys(&addrconf_ops);
6626 out_addrlabel:
6627         ipv6_addr_label_cleanup();
6628 out:
6629         return err;
6630 }
6631
6632 void addrconf_cleanup(void)
6633 {
6634         struct net_device *dev;
6635         int i;
6636
6637         unregister_netdevice_notifier(&ipv6_dev_notf);
6638         unregister_pernet_subsys(&addrconf_ops);
6639         ipv6_addr_label_cleanup();
6640
6641         rtnl_af_unregister(&inet6_ops);
6642
6643         rtnl_lock();
6644
6645         /* clean dev list */
6646         for_each_netdev(&init_net, dev) {
6647                 if (__in6_dev_get(dev) == NULL)
6648                         continue;
6649                 addrconf_ifdown(dev, 1);
6650         }
6651         addrconf_ifdown(init_net.loopback_dev, 2);
6652
6653         /*
6654          *      Check hash table.
6655          */
6656         spin_lock_bh(&addrconf_hash_lock);
6657         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6658                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6659         spin_unlock_bh(&addrconf_hash_lock);
6660         cancel_delayed_work(&addr_chk_work);
6661         rtnl_unlock();
6662
6663         destroy_workqueue(addrconf_wq);
6664 }