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(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 /*
 161  *      Configured unicast address hash table
 162  */
 163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 164 static DEFINE_SPINLOCK(addrconf_hash_lock);
 165
 166 static void addrconf_verify(void);
 167 static void addrconf_verify_rtnl(void);
 168 static void addrconf_verify_work(struct work_struct *);
 169
 170 static struct workqueue_struct *addrconf_wq;
 171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 172
 173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 175
 176 static void addrconf_type_change(struct net_device *dev,
 177                                  unsigned long event);
 178 static int addrconf_ifdown(struct net_device *dev, int how);
 179
 180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 181                                                   int plen,
 182                                                   const struct net_device *dev,
 183                                                   u32 flags, u32 noflags);
 184
 185 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 186 static void addrconf_dad_work(struct work_struct *w);
 187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
 188                                    bool send_na);
 189 static void addrconf_dad_run(struct inet6_dev *idev);
 190 static void addrconf_rs_timer(unsigned long data);
 191 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 192 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 193
 194 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 195                                 struct prefix_info *pinfo);
 196 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 197                                struct net_device *dev);
 198
 199 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 200         .forwarding             = 0,
 201         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 202         .mtu6                   = IPV6_MIN_MTU,
 203         .accept_ra              = 1,
 204         .accept_redirects       = 1,
 205         .autoconf               = 1,
 206         .force_mld_version      = 0,
 207         .mldv1_unsolicited_report_interval = 10 * HZ,
 208         .mldv2_unsolicited_report_interval = HZ,
 209         .dad_transmits          = 1,
 210         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 211         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 212         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 213         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 214         .use_tempaddr           = 0,
 215         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 216         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 217         .regen_max_retry        = REGEN_MAX_RETRY,
 218         .max_desync_factor      = MAX_DESYNC_FACTOR,
 219         .max_addresses          = IPV6_MAX_ADDRESSES,
 220         .accept_ra_defrtr       = 1,
 221         .accept_ra_from_local   = 0,
 222         .accept_ra_min_hop_limit= 1,
 223         .accept_ra_pinfo        = 1,
 224 #ifdef CONFIG_IPV6_ROUTER_PREF
 225         .accept_ra_rtr_pref     = 1,
 226         .rtr_probe_interval     = 60 * HZ,
 227 #ifdef CONFIG_IPV6_ROUTE_INFO
 228         .accept_ra_rt_info_min_plen = 0,
 229         .accept_ra_rt_info_max_plen = 0,
 230 #endif
 231 #endif
 232         .proxy_ndp              = 0,
 233         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 234         .disable_ipv6           = 0,
 235         .accept_dad             = 0,
 236         .suppress_frag_ndisc    = 1,
 237         .accept_ra_mtu          = 1,
 238         .stable_secret          = {
 239                 .initialized = false,
 240         },
 241         .use_oif_addrs_only     = 0,
 242         .ignore_routes_with_linkdown = 0,
 243         .keep_addr_on_down      = 0,
 244         .seg6_enabled           = 0,
 245 #ifdef CONFIG_IPV6_SEG6_HMAC
 246         .seg6_require_hmac      = 0,
 247 #endif
 248         .enhanced_dad           = 1,
 249         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 250         .disable_policy         = 0,
 251 };
 252
 253 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 254         .forwarding             = 0,
 255         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 256         .mtu6                   = IPV6_MIN_MTU,
 257         .accept_ra              = 1,
 258         .accept_redirects       = 1,
 259         .autoconf               = 1,
 260         .force_mld_version      = 0,
 261         .mldv1_unsolicited_report_interval = 10 * HZ,
 262         .mldv2_unsolicited_report_interval = HZ,
 263         .dad_transmits          = 1,
 264         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 265         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 266         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 267         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 268         .use_tempaddr           = 0,
 269         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 270         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 271         .regen_max_retry        = REGEN_MAX_RETRY,
 272         .max_desync_factor      = MAX_DESYNC_FACTOR,
 273         .max_addresses          = IPV6_MAX_ADDRESSES,
 274         .accept_ra_defrtr       = 1,
 275         .accept_ra_from_local   = 0,
 276         .accept_ra_min_hop_limit= 1,
 277         .accept_ra_pinfo        = 1,
 278 #ifdef CONFIG_IPV6_ROUTER_PREF
 279         .accept_ra_rtr_pref     = 1,
 280         .rtr_probe_interval     = 60 * HZ,
 281 #ifdef CONFIG_IPV6_ROUTE_INFO
 282         .accept_ra_rt_info_min_plen = 0,
 283         .accept_ra_rt_info_max_plen = 0,
 284 #endif
 285 #endif
 286         .proxy_ndp              = 0,
 287         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 288         .disable_ipv6           = 0,
 289         .accept_dad             = 1,
 290         .suppress_frag_ndisc    = 1,
 291         .accept_ra_mtu          = 1,
 292         .stable_secret          = {
 293                 .initialized = false,
 294         },
 295         .use_oif_addrs_only     = 0,
 296         .ignore_routes_with_linkdown = 0,
 297         .keep_addr_on_down      = 0,
 298         .seg6_enabled           = 0,
 299 #ifdef CONFIG_IPV6_SEG6_HMAC
 300         .seg6_require_hmac      = 0,
 301 #endif
 302         .enhanced_dad           = 1,
 303         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 304         .disable_policy         = 0,
 305 };
 306
 307 /* Check if link is ready: is it up and is a valid qdisc available */
 308 static inline bool addrconf_link_ready(const struct net_device *dev)
 309 {
 310         return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
 311 }
 312
 313 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 314 {
 315         if (del_timer(&idev->rs_timer))
 316                 __in6_dev_put(idev);
 317 }
 318
 319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 320 {
 321         if (cancel_delayed_work(&ifp->dad_work))
 322                 __in6_ifa_put(ifp);
 323 }
 324
 325 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 326                                   unsigned long when)
 327 {
 328         if (!mod_timer(&idev->rs_timer, jiffies + when))
 329                 in6_dev_hold(idev);
 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 netconfmsg *ncm;
 620         struct sk_buff *skb;
 621         struct ipv6_devconf *devconf;
 622         struct inet6_dev *in6_dev;
 623         struct net_device *dev;
 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                 goto errout;
 631
 632         err = -EINVAL;
 633         if (!tb[NETCONFA_IFINDEX])
 634                 goto errout;
 635
 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                         goto errout;
 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_ATOMIC);
 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         return err;
 673 }
 674
 675 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 676                                       struct netlink_callback *cb)
 677 {
 678         struct net *net = sock_net(skb->sk);
 679         int h, s_h;
 680         int idx, s_idx;
 681         struct net_device *dev;
 682         struct inet6_dev *idev;
 683         struct hlist_head *head;
 684
 685         s_h = cb->args[0];
 686         s_idx = idx = cb->args[1];
 687
 688         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 689                 idx = 0;
 690                 head = &net->dev_index_head[h];
 691                 rcu_read_lock();
 692                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 693                           net->dev_base_seq;
 694                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 695                         if (idx < s_idx)
 696                                 goto cont;
 697                         idev = __in6_dev_get(dev);
 698                         if (!idev)
 699                                 goto cont;
 700
 701                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 702                                                        &idev->cnf,
 703                                                        NETLINK_CB(cb->skb).portid,
 704                                                        cb->nlh->nlmsg_seq,
 705                                                        RTM_NEWNETCONF,
 706                                                        NLM_F_MULTI,
 707                                                        NETCONFA_ALL) < 0) {
 708                                 rcu_read_unlock();
 709                                 goto done;
 710                         }
 711                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 712 cont:
 713                         idx++;
 714                 }
 715                 rcu_read_unlock();
 716         }
 717         if (h == NETDEV_HASHENTRIES) {
 718                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 719                                                net->ipv6.devconf_all,
 720                                                NETLINK_CB(cb->skb).portid,
 721                                                cb->nlh->nlmsg_seq,
 722                                                RTM_NEWNETCONF, NLM_F_MULTI,
 723                                                NETCONFA_ALL) < 0)
 724                         goto done;
 725                 else
 726                         h++;
 727         }
 728         if (h == NETDEV_HASHENTRIES + 1) {
 729                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 730                                                net->ipv6.devconf_dflt,
 731                                                NETLINK_CB(cb->skb).portid,
 732                                                cb->nlh->nlmsg_seq,
 733                                                RTM_NEWNETCONF, NLM_F_MULTI,
 734                                                NETCONFA_ALL) < 0)
 735                         goto done;
 736                 else
 737                         h++;
 738         }
 739 done:
 740         cb->args[0] = h;
 741         cb->args[1] = idx;
 742
 743         return skb->len;
 744 }
 745
 746 #ifdef CONFIG_SYSCTL
 747 static void dev_forward_change(struct inet6_dev *idev)
 748 {
 749         struct net_device *dev;
 750         struct inet6_ifaddr *ifa;
 751
 752         if (!idev)
 753                 return;
 754         dev = idev->dev;
 755         if (idev->cnf.forwarding)
 756                 dev_disable_lro(dev);
 757         if (dev->flags & IFF_MULTICAST) {
 758                 if (idev->cnf.forwarding) {
 759                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 760                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 761                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 762                 } else {
 763                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 764                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 765                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 766                 }
 767         }
 768
 769         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 770                 if (ifa->flags&IFA_F_TENTATIVE)
 771                         continue;
 772                 if (idev->cnf.forwarding)
 773                         addrconf_join_anycast(ifa);
 774                 else
 775                         addrconf_leave_anycast(ifa);
 776         }
 777         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 778                                      NETCONFA_FORWARDING,
 779                                      dev->ifindex, &idev->cnf);
 780 }
 781
 782
 783 static void addrconf_forward_change(struct net *net, __s32 newf)
 784 {
 785         struct net_device *dev;
 786         struct inet6_dev *idev;
 787
 788         for_each_netdev(net, dev) {
 789                 idev = __in6_dev_get(dev);
 790                 if (idev) {
 791                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 792                         idev->cnf.forwarding = newf;
 793                         if (changed)
 794                                 dev_forward_change(idev);
 795                 }
 796         }
 797 }
 798
 799 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 800 {
 801         struct net *net;
 802         int old;
 803
 804         if (!rtnl_trylock())
 805                 return restart_syscall();
 806
 807         net = (struct net *)table->extra2;
 808         old = *p;
 809         *p = newf;
 810
 811         if (p == &net->ipv6.devconf_dflt->forwarding) {
 812                 if ((!newf) ^ (!old))
 813                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 814                                                      NETCONFA_FORWARDING,
 815                                                      NETCONFA_IFINDEX_DEFAULT,
 816                                                      net->ipv6.devconf_dflt);
 817                 rtnl_unlock();
 818                 return 0;
 819         }
 820
 821         if (p == &net->ipv6.devconf_all->forwarding) {
 822                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 823
 824                 net->ipv6.devconf_dflt->forwarding = newf;
 825                 if ((!newf) ^ (!old_dflt))
 826                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 827                                                      NETCONFA_FORWARDING,
 828                                                      NETCONFA_IFINDEX_DEFAULT,
 829                                                      net->ipv6.devconf_dflt);
 830
 831                 addrconf_forward_change(net, newf);
 832                 if ((!newf) ^ (!old))
 833                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 834                                                      NETCONFA_FORWARDING,
 835                                                      NETCONFA_IFINDEX_ALL,
 836                                                      net->ipv6.devconf_all);
 837         } else if ((!newf) ^ (!old))
 838                 dev_forward_change((struct inet6_dev *)table->extra1);
 839         rtnl_unlock();
 840
 841         if (newf)
 842                 rt6_purge_dflt_routers(net);
 843         return 1;
 844 }
 845
 846 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 847 {
 848         struct net_device *dev;
 849         struct inet6_dev *idev;
 850
 851         for_each_netdev(net, dev) {
 852                 idev = __in6_dev_get(dev);
 853                 if (idev) {
 854                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 855
 856                         idev->cnf.ignore_routes_with_linkdown = newf;
 857                         if (changed)
 858                                 inet6_netconf_notify_devconf(dev_net(dev),
 859                                                              RTM_NEWNETCONF,
 860                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 861                                                              dev->ifindex,
 862                                                              &idev->cnf);
 863                 }
 864         }
 865 }
 866
 867 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 868 {
 869         struct net *net;
 870         int old;
 871
 872         if (!rtnl_trylock())
 873                 return restart_syscall();
 874
 875         net = (struct net *)table->extra2;
 876         old = *p;
 877         *p = newf;
 878
 879         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 880                 if ((!newf) ^ (!old))
 881                         inet6_netconf_notify_devconf(net,
 882                                                      RTM_NEWNETCONF,
 883                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 884                                                      NETCONFA_IFINDEX_DEFAULT,
 885                                                      net->ipv6.devconf_dflt);
 886                 rtnl_unlock();
 887                 return 0;
 888         }
 889
 890         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 891                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 892                 addrconf_linkdown_change(net, newf);
 893                 if ((!newf) ^ (!old))
 894                         inet6_netconf_notify_devconf(net,
 895                                                      RTM_NEWNETCONF,
 896                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 897                                                      NETCONFA_IFINDEX_ALL,
 898                                                      net->ipv6.devconf_all);
 899         }
 900         rtnl_unlock();
 901
 902         return 1;
 903 }
 904
 905 #endif
 906
 907 /* Nobody refers to this ifaddr, destroy it */
 908 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 909 {
 910         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 911
 912 #ifdef NET_REFCNT_DEBUG
 913         pr_debug("%s\n", __func__);
 914 #endif
 915
 916         in6_dev_put(ifp->idev);
 917
 918         if (cancel_delayed_work(&ifp->dad_work))
 919                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 920                           ifp);
 921
 922         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 923                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 924                 return;
 925         }
 926         ip6_rt_put(ifp->rt);
 927
 928         kfree_rcu(ifp, rcu);
 929 }
 930
 931 static void
 932 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 933 {
 934         struct list_head *p;
 935         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 936
 937         /*
 938          * Each device address list is sorted in order of scope -
 939          * global before linklocal.
 940          */
 941         list_for_each(p, &idev->addr_list) {
 942                 struct inet6_ifaddr *ifa
 943                         = list_entry(p, struct inet6_ifaddr, if_list);
 944                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 945                         break;
 946         }
 947
 948         list_add_tail(&ifp->if_list, p);
 949 }
 950
 951 static u32 inet6_addr_hash(const struct in6_addr *addr)
 952 {
 953         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 954 }
 955
 956 /* On success it returns ifp with increased reference count */
 957
 958 static struct inet6_ifaddr *
 959 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 960               const struct in6_addr *peer_addr, int pfxlen,
 961               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 962 {
 963         struct net *net = dev_net(idev->dev);
 964         struct inet6_ifaddr *ifa = NULL;
 965         struct rt6_info *rt;
 966         struct in6_validator_info i6vi;
 967         unsigned int hash;
 968         int err = 0;
 969         int addr_type = ipv6_addr_type(addr);
 970
 971         if (addr_type == IPV6_ADDR_ANY ||
 972             addr_type & IPV6_ADDR_MULTICAST ||
 973             (!(idev->dev->flags & IFF_LOOPBACK) &&
 974              addr_type & IPV6_ADDR_LOOPBACK))
 975                 return ERR_PTR(-EADDRNOTAVAIL);
 976
 977         rcu_read_lock_bh();
 978
 979         in6_dev_hold(idev);
 980
 981         if (idev->dead) {
 982                 err = -ENODEV;                  /*XXX*/
 983                 goto out2;
 984         }
 985
 986         if (idev->cnf.disable_ipv6) {
 987                 err = -EACCES;
 988                 goto out2;
 989         }
 990
 991         i6vi.i6vi_addr = *addr;
 992         i6vi.i6vi_dev = idev;
 993         rcu_read_unlock_bh();
 994
 995         err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
 996
 997         rcu_read_lock_bh();
 998         err = notifier_to_errno(err);
 999         if (err)
1000                 goto out2;
1001
1002         spin_lock(&addrconf_hash_lock);
1003
1004         /* Ignore adding duplicate addresses on an interface */
1005         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1006                 ADBG("ipv6_add_addr: already assigned\n");
1007                 err = -EEXIST;
1008                 goto out;
1009         }
1010
1011         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1012
1013         if (!ifa) {
1014                 ADBG("ipv6_add_addr: malloc failed\n");
1015                 err = -ENOBUFS;
1016                 goto out;
1017         }
1018
1019         rt = addrconf_dst_alloc(idev, addr, false);
1020         if (IS_ERR(rt)) {
1021                 err = PTR_ERR(rt);
1022                 goto out;
1023         }
1024
1025         if (net->ipv6.devconf_all->disable_policy ||
1026             idev->cnf.disable_policy)
1027                 rt->dst.flags |= DST_NOPOLICY;
1028
1029         neigh_parms_data_state_setall(idev->nd_parms);
1030
1031         ifa->addr = *addr;
1032         if (peer_addr)
1033                 ifa->peer_addr = *peer_addr;
1034
1035         spin_lock_init(&ifa->lock);
1036         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1037         INIT_HLIST_NODE(&ifa->addr_lst);
1038         ifa->scope = scope;
1039         ifa->prefix_len = pfxlen;
1040         ifa->flags = flags;
1041         /* No need to add the TENTATIVE flag for addresses with NODAD */
1042         if (!(flags & IFA_F_NODAD))
1043                 ifa->flags |= IFA_F_TENTATIVE;
1044         ifa->valid_lft = valid_lft;
1045         ifa->prefered_lft = prefered_lft;
1046         ifa->cstamp = ifa->tstamp = jiffies;
1047         ifa->tokenized = false;
1048
1049         ifa->rt = rt;
1050
1051         ifa->idev = idev;
1052         /* For caller */
1053         refcount_set(&ifa->refcnt, 1);
1054
1055         /* Add to big hash table */
1056         hash = inet6_addr_hash(addr);
1057
1058         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1059         spin_unlock(&addrconf_hash_lock);
1060
1061         write_lock(&idev->lock);
1062         /* Add to inet6_dev unicast addr list. */
1063         ipv6_link_dev_addr(idev, ifa);
1064
1065         if (ifa->flags&IFA_F_TEMPORARY) {
1066                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1067                 in6_ifa_hold(ifa);
1068         }
1069
1070         in6_ifa_hold(ifa);
1071         write_unlock(&idev->lock);
1072 out2:
1073         rcu_read_unlock_bh();
1074
1075         if (likely(err == 0))
1076                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1077         else {
1078                 kfree(ifa);
1079                 in6_dev_put(idev);
1080                 ifa = ERR_PTR(err);
1081         }
1082
1083         return ifa;
1084 out:
1085         spin_unlock(&addrconf_hash_lock);
1086         goto out2;
1087 }
1088
1089 enum cleanup_prefix_rt_t {
1090         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1091         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1092         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1093 };
1094
1095 /*
1096  * Check, whether the prefix for ifp would still need a prefix route
1097  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1098  * constants.
1099  *
1100  * 1) we don't purge prefix if address was not permanent.
1101  *    prefix is managed by its own lifetime.
1102  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1103  * 3) if there are no addresses, delete prefix.
1104  * 4) if there are still other permanent address(es),
1105  *    corresponding prefix is still permanent.
1106  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1107  *    don't purge the prefix, assume user space is managing it.
1108  * 6) otherwise, update prefix lifetime to the
1109  *    longest valid lifetime among the corresponding
1110  *    addresses on the device.
1111  *    Note: subsequent RA will update lifetime.
1112  **/
1113 static enum cleanup_prefix_rt_t
1114 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1115 {
1116         struct inet6_ifaddr *ifa;
1117         struct inet6_dev *idev = ifp->idev;
1118         unsigned long lifetime;
1119         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1120
1121         *expires = jiffies;
1122
1123         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1124                 if (ifa == ifp)
1125                         continue;
1126                 if (ifa->prefix_len != ifp->prefix_len ||
1127                     !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1128                                        ifp->prefix_len))
1129                         continue;
1130                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1131                         return CLEANUP_PREFIX_RT_NOP;
1132
1133                 action = CLEANUP_PREFIX_RT_EXPIRE;
1134
1135                 spin_lock(&ifa->lock);
1136
1137                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1138                 /*
1139                  * Note: Because this address is
1140                  * not permanent, lifetime <
1141                  * LONG_MAX / HZ here.
1142                  */
1143                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1144                         *expires = ifa->tstamp + lifetime * HZ;
1145                 spin_unlock(&ifa->lock);
1146         }
1147
1148         return action;
1149 }
1150
1151 static void
1152 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1153 {
1154         struct rt6_info *rt;
1155
1156         rt = addrconf_get_prefix_route(&ifp->addr,
1157                                        ifp->prefix_len,
1158                                        ifp->idev->dev,
1159                                        0, RTF_GATEWAY | RTF_DEFAULT);
1160         if (rt) {
1161                 if (del_rt)
1162                         ip6_del_rt(rt);
1163                 else {
1164                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1165                                 rt6_set_expires(rt, expires);
1166                         ip6_rt_put(rt);
1167                 }
1168         }
1169 }
1170
1171
1172 /* This function wants to get referenced ifp and releases it before return */
1173
1174 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1175 {
1176         int state;
1177         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1178         unsigned long expires;
1179
1180         ASSERT_RTNL();
1181
1182         spin_lock_bh(&ifp->lock);
1183         state = ifp->state;
1184         ifp->state = INET6_IFADDR_STATE_DEAD;
1185         spin_unlock_bh(&ifp->lock);
1186
1187         if (state == INET6_IFADDR_STATE_DEAD)
1188                 goto out;
1189
1190         spin_lock_bh(&addrconf_hash_lock);
1191         hlist_del_init_rcu(&ifp->addr_lst);
1192         spin_unlock_bh(&addrconf_hash_lock);
1193
1194         write_lock_bh(&ifp->idev->lock);
1195
1196         if (ifp->flags&IFA_F_TEMPORARY) {
1197                 list_del(&ifp->tmp_list);
1198                 if (ifp->ifpub) {
1199                         in6_ifa_put(ifp->ifpub);
1200                         ifp->ifpub = NULL;
1201                 }
1202                 __in6_ifa_put(ifp);
1203         }
1204
1205         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1206                 action = check_cleanup_prefix_route(ifp, &expires);
1207
1208         list_del_init(&ifp->if_list);
1209         __in6_ifa_put(ifp);
1210
1211         write_unlock_bh(&ifp->idev->lock);
1212
1213         addrconf_del_dad_work(ifp);
1214
1215         ipv6_ifa_notify(RTM_DELADDR, ifp);
1216
1217         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1218
1219         if (action != CLEANUP_PREFIX_RT_NOP) {
1220                 cleanup_prefix_route(ifp, expires,
1221                         action == CLEANUP_PREFIX_RT_DEL);
1222         }
1223
1224         /* clean up prefsrc entries */
1225         rt6_remove_prefsrc(ifp);
1226 out:
1227         in6_ifa_put(ifp);
1228 }
1229
1230 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1231 {
1232         struct inet6_dev *idev = ifp->idev;
1233         struct in6_addr addr, *tmpaddr;
1234         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1235         unsigned long regen_advance;
1236         int tmp_plen;
1237         int ret = 0;
1238         u32 addr_flags;
1239         unsigned long now = jiffies;
1240         long max_desync_factor;
1241         s32 cnf_temp_preferred_lft;
1242
1243         write_lock_bh(&idev->lock);
1244         if (ift) {
1245                 spin_lock_bh(&ift->lock);
1246                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1247                 spin_unlock_bh(&ift->lock);
1248                 tmpaddr = &addr;
1249         } else {
1250                 tmpaddr = NULL;
1251         }
1252 retry:
1253         in6_dev_hold(idev);
1254         if (idev->cnf.use_tempaddr <= 0) {
1255                 write_unlock_bh(&idev->lock);
1256                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1257                 in6_dev_put(idev);
1258                 ret = -1;
1259                 goto out;
1260         }
1261         spin_lock_bh(&ifp->lock);
1262         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1263                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1264                 spin_unlock_bh(&ifp->lock);
1265                 write_unlock_bh(&idev->lock);
1266                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1267                         __func__);
1268                 in6_dev_put(idev);
1269                 ret = -1;
1270                 goto out;
1271         }
1272         in6_ifa_hold(ifp);
1273         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1274         ipv6_try_regen_rndid(idev, tmpaddr);
1275         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1276         age = (now - ifp->tstamp) / HZ;
1277
1278         regen_advance = idev->cnf.regen_max_retry *
1279                         idev->cnf.dad_transmits *
1280                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1281
1282         /* recalculate max_desync_factor each time and update
1283          * idev->desync_factor if it's larger
1284          */
1285         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1286         max_desync_factor = min_t(long,
1287                                   idev->cnf.max_desync_factor,
1288                                   cnf_temp_preferred_lft - regen_advance);
1289
1290         if (unlikely(idev->desync_factor > max_desync_factor)) {
1291                 if (max_desync_factor > 0) {
1292                         get_random_bytes(&idev->desync_factor,
1293                                          sizeof(idev->desync_factor));
1294                         idev->desync_factor %= max_desync_factor;
1295                 } else {
1296                         idev->desync_factor = 0;
1297                 }
1298         }
1299
1300         tmp_valid_lft = min_t(__u32,
1301                               ifp->valid_lft,
1302                               idev->cnf.temp_valid_lft + age);
1303         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1304                             idev->desync_factor;
1305         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1306         tmp_plen = ifp->prefix_len;
1307         tmp_tstamp = ifp->tstamp;
1308         spin_unlock_bh(&ifp->lock);
1309
1310         write_unlock_bh(&idev->lock);
1311
1312         /* A temporary address is created only if this calculated Preferred
1313          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1314          * an implementation must not create a temporary address with a zero
1315          * Preferred Lifetime.
1316          * Use age calculation as in addrconf_verify to avoid unnecessary
1317          * temporary addresses being generated.
1318          */
1319         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1320         if (tmp_prefered_lft <= regen_advance + age) {
1321                 in6_ifa_put(ifp);
1322                 in6_dev_put(idev);
1323                 ret = -1;
1324                 goto out;
1325         }
1326
1327         addr_flags = IFA_F_TEMPORARY;
1328         /* set in addrconf_prefix_rcv() */
1329         if (ifp->flags & IFA_F_OPTIMISTIC)
1330                 addr_flags |= IFA_F_OPTIMISTIC;
1331
1332         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1333                             ipv6_addr_scope(&addr), addr_flags,
1334                             tmp_valid_lft, tmp_prefered_lft);
1335         if (IS_ERR(ift)) {
1336                 in6_ifa_put(ifp);
1337                 in6_dev_put(idev);
1338                 pr_info("%s: retry temporary address regeneration\n", __func__);
1339                 tmpaddr = &addr;
1340                 write_lock_bh(&idev->lock);
1341                 goto retry;
1342         }
1343
1344         spin_lock_bh(&ift->lock);
1345         ift->ifpub = ifp;
1346         ift->cstamp = now;
1347         ift->tstamp = tmp_tstamp;
1348         spin_unlock_bh(&ift->lock);
1349
1350         addrconf_dad_start(ift);
1351         in6_ifa_put(ift);
1352         in6_dev_put(idev);
1353 out:
1354         return ret;
1355 }
1356
1357 /*
1358  *      Choose an appropriate source address (RFC3484)
1359  */
1360 enum {
1361         IPV6_SADDR_RULE_INIT = 0,
1362         IPV6_SADDR_RULE_LOCAL,
1363         IPV6_SADDR_RULE_SCOPE,
1364         IPV6_SADDR_RULE_PREFERRED,
1365 #ifdef CONFIG_IPV6_MIP6
1366         IPV6_SADDR_RULE_HOA,
1367 #endif
1368         IPV6_SADDR_RULE_OIF,
1369         IPV6_SADDR_RULE_LABEL,
1370         IPV6_SADDR_RULE_PRIVACY,
1371         IPV6_SADDR_RULE_ORCHID,
1372         IPV6_SADDR_RULE_PREFIX,
1373 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1374         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1375 #endif
1376         IPV6_SADDR_RULE_MAX
1377 };
1378
1379 struct ipv6_saddr_score {
1380         int                     rule;
1381         int                     addr_type;
1382         struct inet6_ifaddr     *ifa;
1383         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1384         int                     scopedist;
1385         int                     matchlen;
1386 };
1387
1388 struct ipv6_saddr_dst {
1389         const struct in6_addr *addr;
1390         int ifindex;
1391         int scope;
1392         int label;
1393         unsigned int prefs;
1394 };
1395
1396 static inline int ipv6_saddr_preferred(int type)
1397 {
1398         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1399                 return 1;
1400         return 0;
1401 }
1402
1403 static bool ipv6_use_optimistic_addr(struct net *net,
1404                                      struct inet6_dev *idev)
1405 {
1406 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1407         if (!idev)
1408                 return false;
1409         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1410                 return false;
1411         if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1412                 return false;
1413
1414         return true;
1415 #else
1416         return false;
1417 #endif
1418 }
1419
1420 static int ipv6_get_saddr_eval(struct net *net,
1421                                struct ipv6_saddr_score *score,
1422                                struct ipv6_saddr_dst *dst,
1423                                int i)
1424 {
1425         int ret;
1426
1427         if (i <= score->rule) {
1428                 switch (i) {
1429                 case IPV6_SADDR_RULE_SCOPE:
1430                         ret = score->scopedist;
1431                         break;
1432                 case IPV6_SADDR_RULE_PREFIX:
1433                         ret = score->matchlen;
1434                         break;
1435                 default:
1436                         ret = !!test_bit(i, score->scorebits);
1437                 }
1438                 goto out;
1439         }
1440
1441         switch (i) {
1442         case IPV6_SADDR_RULE_INIT:
1443                 /* Rule 0: remember if hiscore is not ready yet */
1444                 ret = !!score->ifa;
1445                 break;
1446         case IPV6_SADDR_RULE_LOCAL:
1447                 /* Rule 1: Prefer same address */
1448                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1449                 break;
1450         case IPV6_SADDR_RULE_SCOPE:
1451                 /* Rule 2: Prefer appropriate scope
1452                  *
1453                  *      ret
1454                  *       ^
1455                  *    -1 |  d 15
1456                  *    ---+--+-+---> scope
1457                  *       |
1458                  *       |             d is scope of the destination.
1459                  *  B-d  |  \
1460                  *       |   \      <- smaller scope is better if
1461                  *  B-15 |    \        if scope is enough for destination.
1462                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1463                  * d-C-1 | /
1464                  *       |/         <- greater is better
1465                  *   -C  /             if scope is not enough for destination.
1466                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1467                  *
1468                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1469                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1470                  * Assume B = 0 and we get C > 29.
1471                  */
1472                 ret = __ipv6_addr_src_scope(score->addr_type);
1473                 if (ret >= dst->scope)
1474                         ret = -ret;
1475                 else
1476                         ret -= 128;     /* 30 is enough */
1477                 score->scopedist = ret;
1478                 break;
1479         case IPV6_SADDR_RULE_PREFERRED:
1480             {
1481                 /* Rule 3: Avoid deprecated and optimistic addresses */
1482                 u8 avoid = IFA_F_DEPRECATED;
1483
1484                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1485                         avoid |= IFA_F_OPTIMISTIC;
1486                 ret = ipv6_saddr_preferred(score->addr_type) ||
1487                       !(score->ifa->flags & avoid);
1488                 break;
1489             }
1490 #ifdef CONFIG_IPV6_MIP6
1491         case IPV6_SADDR_RULE_HOA:
1492             {
1493                 /* Rule 4: Prefer home address */
1494                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1495                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1496                 break;
1497             }
1498 #endif
1499         case IPV6_SADDR_RULE_OIF:
1500                 /* Rule 5: Prefer outgoing interface */
1501                 ret = (!dst->ifindex ||
1502                        dst->ifindex == score->ifa->idev->dev->ifindex);
1503                 break;
1504         case IPV6_SADDR_RULE_LABEL:
1505                 /* Rule 6: Prefer matching label */
1506                 ret = ipv6_addr_label(net,
1507                                       &score->ifa->addr, score->addr_type,
1508                                       score->ifa->idev->dev->ifindex) == dst->label;
1509                 break;
1510         case IPV6_SADDR_RULE_PRIVACY:
1511             {
1512                 /* Rule 7: Prefer public address
1513                  * Note: prefer temporary address if use_tempaddr >= 2
1514                  */
1515                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1516                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1517                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1518                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1519                 break;
1520             }
1521         case IPV6_SADDR_RULE_ORCHID:
1522                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1523                  *          non-ORCHID vs non-ORCHID
1524                  */
1525                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1526                         ipv6_addr_orchid(dst->addr));
1527                 break;
1528         case IPV6_SADDR_RULE_PREFIX:
1529                 /* Rule 8: Use longest matching prefix */
1530                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1531                 if (ret > score->ifa->prefix_len)
1532                         ret = score->ifa->prefix_len;
1533                 score->matchlen = ret;
1534                 break;
1535 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1536         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1537                 /* Optimistic addresses still have lower precedence than other
1538                  * preferred addresses.
1539                  */
1540                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1541                 break;
1542 #endif
1543         default:
1544                 ret = 0;
1545         }
1546
1547         if (ret)
1548                 __set_bit(i, score->scorebits);
1549         score->rule = i;
1550 out:
1551         return ret;
1552 }
1553
1554 static int __ipv6_dev_get_saddr(struct net *net,
1555                                 struct ipv6_saddr_dst *dst,
1556                                 struct inet6_dev *idev,
1557                                 struct ipv6_saddr_score *scores,
1558                                 int hiscore_idx)
1559 {
1560         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1561
1562         read_lock_bh(&idev->lock);
1563         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1564                 int i;
1565
1566                 /*
1567                  * - Tentative Address (RFC2462 section 5.4)
1568                  *  - A tentative address is not considered
1569                  *    "assigned to an interface" in the traditional
1570                  *    sense, unless it is also flagged as optimistic.
1571                  * - Candidate Source Address (section 4)
1572                  *  - In any case, anycast addresses, multicast
1573                  *    addresses, and the unspecified address MUST
1574                  *    NOT be included in a candidate set.
1575                  */
1576                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1577                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1578                         continue;
1579
1580                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1581
1582                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1583                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1584                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1585                                             idev->dev->name);
1586                         continue;
1587                 }
1588
1589                 score->rule = -1;
1590                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1591
1592                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1593                         int minihiscore, miniscore;
1594
1595                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1596                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1597
1598                         if (minihiscore > miniscore) {
1599                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1600                                     score->scopedist > 0) {
1601                                         /*
1602                                          * special case:
1603                                          * each remaining entry
1604                                          * has too small (not enough)
1605                                          * scope, because ifa entries
1606                                          * are sorted by their scope
1607                                          * values.
1608                                          */
1609                                         goto out;
1610                                 }
1611                                 break;
1612                         } else if (minihiscore < miniscore) {
1613                                 if (hiscore->ifa)
1614                                         in6_ifa_put(hiscore->ifa);
1615
1616                                 in6_ifa_hold(score->ifa);
1617
1618                                 swap(hiscore, score);
1619                                 hiscore_idx = 1 - hiscore_idx;
1620
1621                                 /* restore our iterator */
1622                                 score->ifa = hiscore->ifa;
1623
1624                                 break;
1625                         }
1626                 }
1627         }
1628 out:
1629         read_unlock_bh(&idev->lock);
1630         return hiscore_idx;
1631 }
1632
1633 static int ipv6_get_saddr_master(struct net *net,
1634                                  const struct net_device *dst_dev,
1635                                  const struct net_device *master,
1636                                  struct ipv6_saddr_dst *dst,
1637                                  struct ipv6_saddr_score *scores,
1638                                  int hiscore_idx)
1639 {
1640         struct inet6_dev *idev;
1641
1642         idev = __in6_dev_get(dst_dev);
1643         if (idev)
1644                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1645                                                    scores, hiscore_idx);
1646
1647         idev = __in6_dev_get(master);
1648         if (idev)
1649                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1650                                                    scores, hiscore_idx);
1651
1652         return hiscore_idx;
1653 }
1654
1655 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1656                        const struct in6_addr *daddr, unsigned int prefs,
1657                        struct in6_addr *saddr)
1658 {
1659         struct ipv6_saddr_score scores[2], *hiscore;
1660         struct ipv6_saddr_dst dst;
1661         struct inet6_dev *idev;
1662         struct net_device *dev;
1663         int dst_type;
1664         bool use_oif_addr = false;
1665         int hiscore_idx = 0;
1666
1667         dst_type = __ipv6_addr_type(daddr);
1668         dst.addr = daddr;
1669         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1670         dst.scope = __ipv6_addr_src_scope(dst_type);
1671         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1672         dst.prefs = prefs;
1673
1674         scores[hiscore_idx].rule = -1;
1675         scores[hiscore_idx].ifa = NULL;
1676
1677         rcu_read_lock();
1678
1679         /* Candidate Source Address (section 4)
1680          *  - multicast and link-local destination address,
1681          *    the set of candidate source address MUST only
1682          *    include addresses assigned to interfaces
1683          *    belonging to the same link as the outgoing
1684          *    interface.
1685          * (- For site-local destination addresses, the
1686          *    set of candidate source addresses MUST only
1687          *    include addresses assigned to interfaces
1688          *    belonging to the same site as the outgoing
1689          *    interface.)
1690          *  - "It is RECOMMENDED that the candidate source addresses
1691          *    be the set of unicast addresses assigned to the
1692          *    interface that will be used to send to the destination
1693          *    (the 'outgoing' interface)." (RFC 6724)
1694          */
1695         if (dst_dev) {
1696                 idev = __in6_dev_get(dst_dev);
1697                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1698                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1699                     (idev && idev->cnf.use_oif_addrs_only)) {
1700                         use_oif_addr = true;
1701                 }
1702         }
1703
1704         if (use_oif_addr) {
1705                 if (idev)
1706                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1707         } else {
1708                 const struct net_device *master;
1709                 int master_idx = 0;
1710
1711                 /* if dst_dev exists and is enslaved to an L3 device, then
1712                  * prefer addresses from dst_dev and then the master over
1713                  * any other enslaved devices in the L3 domain.
1714                  */
1715                 master = l3mdev_master_dev_rcu(dst_dev);
1716                 if (master) {
1717                         master_idx = master->ifindex;
1718
1719                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1720                                                             master, &dst,
1721                                                             scores, hiscore_idx);
1722
1723                         if (scores[hiscore_idx].ifa)
1724                                 goto out;
1725                 }
1726
1727                 for_each_netdev_rcu(net, dev) {
1728                         /* only consider addresses on devices in the
1729                          * same L3 domain
1730                          */
1731                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1732                                 continue;
1733                         idev = __in6_dev_get(dev);
1734                         if (!idev)
1735                                 continue;
1736                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1737                 }
1738         }
1739
1740 out:
1741         rcu_read_unlock();
1742
1743         hiscore = &scores[hiscore_idx];
1744         if (!hiscore->ifa)
1745                 return -EADDRNOTAVAIL;
1746
1747         *saddr = hiscore->ifa->addr;
1748         in6_ifa_put(hiscore->ifa);
1749         return 0;
1750 }
1751 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1752
1753 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1754                       u32 banned_flags)
1755 {
1756         struct inet6_ifaddr *ifp;
1757         int err = -EADDRNOTAVAIL;
1758
1759         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1760                 if (ifp->scope > IFA_LINK)
1761                         break;
1762                 if (ifp->scope == IFA_LINK &&
1763                     !(ifp->flags & banned_flags)) {
1764                         *addr = ifp->addr;
1765                         err = 0;
1766                         break;
1767                 }
1768         }
1769         return err;
1770 }
1771
1772 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1773                     u32 banned_flags)
1774 {
1775         struct inet6_dev *idev;
1776         int err = -EADDRNOTAVAIL;
1777
1778         rcu_read_lock();
1779         idev = __in6_dev_get(dev);
1780         if (idev) {
1781                 read_lock_bh(&idev->lock);
1782                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1783                 read_unlock_bh(&idev->lock);
1784         }
1785         rcu_read_unlock();
1786         return err;
1787 }
1788
1789 static int ipv6_count_addresses(struct inet6_dev *idev)
1790 {
1791         int cnt = 0;
1792         struct inet6_ifaddr *ifp;
1793
1794         read_lock_bh(&idev->lock);
1795         list_for_each_entry(ifp, &idev->addr_list, if_list)
1796                 cnt++;
1797         read_unlock_bh(&idev->lock);
1798         return cnt;
1799 }
1800
1801 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1802                   const struct net_device *dev, int strict)
1803 {
1804         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1805 }
1806 EXPORT_SYMBOL(ipv6_chk_addr);
1807
1808 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1809                             const struct net_device *dev, int strict,
1810                             u32 banned_flags)
1811 {
1812         struct inet6_ifaddr *ifp;
1813         unsigned int hash = inet6_addr_hash(addr);
1814         u32 ifp_flags;
1815
1816         rcu_read_lock_bh();
1817         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1818                 if (!net_eq(dev_net(ifp->idev->dev), net))
1819                         continue;
1820                 /* Decouple optimistic from tentative for evaluation here.
1821                  * Ban optimistic addresses explicitly, when required.
1822                  */
1823                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1824                             ? (ifp->flags&~IFA_F_TENTATIVE)
1825                             : ifp->flags;
1826                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1827                     !(ifp_flags&banned_flags) &&
1828                     (!dev || ifp->idev->dev == dev ||
1829                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1830                         rcu_read_unlock_bh();
1831                         return 1;
1832                 }
1833         }
1834
1835         rcu_read_unlock_bh();
1836         return 0;
1837 }
1838 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1839
1840 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1841                                struct net_device *dev)
1842 {
1843         unsigned int hash = inet6_addr_hash(addr);
1844         struct inet6_ifaddr *ifp;
1845
1846         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1847                 if (!net_eq(dev_net(ifp->idev->dev), net))
1848                         continue;
1849                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1850                         if (!dev || ifp->idev->dev == dev)
1851                                 return true;
1852                 }
1853         }
1854         return false;
1855 }
1856
1857 /* Compares an address/prefix_len with addresses on device @dev.
1858  * If one is found it returns true.
1859  */
1860 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1861         const unsigned int prefix_len, struct net_device *dev)
1862 {
1863         struct inet6_dev *idev;
1864         struct inet6_ifaddr *ifa;
1865         bool ret = false;
1866
1867         rcu_read_lock();
1868         idev = __in6_dev_get(dev);
1869         if (idev) {
1870                 read_lock_bh(&idev->lock);
1871                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1872                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1873                         if (ret)
1874                                 break;
1875                 }
1876                 read_unlock_bh(&idev->lock);
1877         }
1878         rcu_read_unlock();
1879
1880         return ret;
1881 }
1882 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1883
1884 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1885 {
1886         struct inet6_dev *idev;
1887         struct inet6_ifaddr *ifa;
1888         int     onlink;
1889
1890         onlink = 0;
1891         rcu_read_lock();
1892         idev = __in6_dev_get(dev);
1893         if (idev) {
1894                 read_lock_bh(&idev->lock);
1895                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1896                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1897                                                    ifa->prefix_len);
1898                         if (onlink)
1899                                 break;
1900                 }
1901                 read_unlock_bh(&idev->lock);
1902         }
1903         rcu_read_unlock();
1904         return onlink;
1905 }
1906 EXPORT_SYMBOL(ipv6_chk_prefix);
1907
1908 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1909                                      struct net_device *dev, int strict)
1910 {
1911         struct inet6_ifaddr *ifp, *result = NULL;
1912         unsigned int hash = inet6_addr_hash(addr);
1913
1914         rcu_read_lock_bh();
1915         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1916                 if (!net_eq(dev_net(ifp->idev->dev), net))
1917                         continue;
1918                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1919                         if (!dev || ifp->idev->dev == dev ||
1920                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1921                                 result = ifp;
1922                                 in6_ifa_hold(ifp);
1923                                 break;
1924                         }
1925                 }
1926         }
1927         rcu_read_unlock_bh();
1928
1929         return result;
1930 }
1931
1932 /* Gets referenced address, destroys ifaddr */
1933
1934 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1935 {
1936         if (dad_failed)
1937                 ifp->flags |= IFA_F_DADFAILED;
1938
1939         if (ifp->flags&IFA_F_TEMPORARY) {
1940                 struct inet6_ifaddr *ifpub;
1941                 spin_lock_bh(&ifp->lock);
1942                 ifpub = ifp->ifpub;
1943                 if (ifpub) {
1944                         in6_ifa_hold(ifpub);
1945                         spin_unlock_bh(&ifp->lock);
1946                         ipv6_create_tempaddr(ifpub, ifp);
1947                         in6_ifa_put(ifpub);
1948                 } else {
1949                         spin_unlock_bh(&ifp->lock);
1950                 }
1951                 ipv6_del_addr(ifp);
1952         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1953                 spin_lock_bh(&ifp->lock);
1954                 addrconf_del_dad_work(ifp);
1955                 ifp->flags |= IFA_F_TENTATIVE;
1956                 spin_unlock_bh(&ifp->lock);
1957                 if (dad_failed)
1958                         ipv6_ifa_notify(0, ifp);
1959                 in6_ifa_put(ifp);
1960         } else {
1961                 ipv6_del_addr(ifp);
1962         }
1963 }
1964
1965 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1966 {
1967         int err = -ENOENT;
1968
1969         spin_lock_bh(&ifp->lock);
1970         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1971                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1972                 err = 0;
1973         }
1974         spin_unlock_bh(&ifp->lock);
1975
1976         return err;
1977 }
1978
1979 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1980 {
1981         struct inet6_dev *idev = ifp->idev;
1982         struct net *net = dev_net(ifp->idev->dev);
1983
1984         if (addrconf_dad_end(ifp)) {
1985                 in6_ifa_put(ifp);
1986                 return;
1987         }
1988
1989         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1990                              ifp->idev->dev->name, &ifp->addr);
1991
1992         spin_lock_bh(&ifp->lock);
1993
1994         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1995                 int scope = ifp->scope;
1996                 u32 flags = ifp->flags;
1997                 struct in6_addr new_addr;
1998                 struct inet6_ifaddr *ifp2;
1999                 u32 valid_lft, preferred_lft;
2000                 int pfxlen = ifp->prefix_len;
2001                 int retries = ifp->stable_privacy_retry + 1;
2002
2003                 if (retries > net->ipv6.sysctl.idgen_retries) {
2004                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2005                                              ifp->idev->dev->name);
2006                         goto errdad;
2007                 }
2008
2009                 new_addr = ifp->addr;
2010                 if (ipv6_generate_stable_address(&new_addr, retries,
2011                                                  idev))
2012                         goto errdad;
2013
2014                 valid_lft = ifp->valid_lft;
2015                 preferred_lft = ifp->prefered_lft;
2016
2017                 spin_unlock_bh(&ifp->lock);
2018
2019                 if (idev->cnf.max_addresses &&
2020                     ipv6_count_addresses(idev) >=
2021                     idev->cnf.max_addresses)
2022                         goto lock_errdad;
2023
2024                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2025                                      ifp->idev->dev->name);
2026
2027                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2028                                      scope, flags, valid_lft,
2029                                      preferred_lft);
2030                 if (IS_ERR(ifp2))
2031                         goto lock_errdad;
2032
2033                 spin_lock_bh(&ifp2->lock);
2034                 ifp2->stable_privacy_retry = retries;
2035                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2036                 spin_unlock_bh(&ifp2->lock);
2037
2038                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2039                 in6_ifa_put(ifp2);
2040 lock_errdad:
2041                 spin_lock_bh(&ifp->lock);
2042         }
2043
2044 errdad:
2045         /* transition from _POSTDAD to _ERRDAD */
2046         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2047         spin_unlock_bh(&ifp->lock);
2048
2049         addrconf_mod_dad_work(ifp, 0);
2050         in6_ifa_put(ifp);
2051 }
2052
2053 /* Join to solicited addr multicast group.
2054  * caller must hold RTNL */
2055 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2056 {
2057         struct in6_addr maddr;
2058
2059         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2060                 return;
2061
2062         addrconf_addr_solict_mult(addr, &maddr);
2063         ipv6_dev_mc_inc(dev, &maddr);
2064 }
2065
2066 /* caller must hold RTNL */
2067 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2068 {
2069         struct in6_addr maddr;
2070
2071         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2072                 return;
2073
2074         addrconf_addr_solict_mult(addr, &maddr);
2075         __ipv6_dev_mc_dec(idev, &maddr);
2076 }
2077
2078 /* caller must hold RTNL */
2079 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2080 {
2081         struct in6_addr addr;
2082
2083         if (ifp->prefix_len >= 127) /* RFC 6164 */
2084                 return;
2085         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2086         if (ipv6_addr_any(&addr))
2087                 return;
2088         __ipv6_dev_ac_inc(ifp->idev, &addr);
2089 }
2090
2091 /* caller must hold RTNL */
2092 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2093 {
2094         struct in6_addr addr;
2095
2096         if (ifp->prefix_len >= 127) /* RFC 6164 */
2097                 return;
2098         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2099         if (ipv6_addr_any(&addr))
2100                 return;
2101         __ipv6_dev_ac_dec(ifp->idev, &addr);
2102 }
2103
2104 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2105 {
2106         switch (dev->addr_len) {
2107         case ETH_ALEN:
2108                 memcpy(eui, dev->dev_addr, 3);
2109                 eui[3] = 0xFF;
2110                 eui[4] = 0xFE;
2111                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2112                 break;
2113         case EUI64_ADDR_LEN:
2114                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2115                 eui[0] ^= 2;
2116                 break;
2117         default:
2118                 return -1;
2119         }
2120
2121         return 0;
2122 }
2123
2124 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2125 {
2126         union fwnet_hwaddr *ha;
2127
2128         if (dev->addr_len != FWNET_ALEN)
2129                 return -1;
2130
2131         ha = (union fwnet_hwaddr *)dev->dev_addr;
2132
2133         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2134         eui[0] ^= 2;
2135         return 0;
2136 }
2137
2138 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2139 {
2140         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2141         if (dev->addr_len != ARCNET_ALEN)
2142                 return -1;
2143         memset(eui, 0, 7);
2144         eui[7] = *(u8 *)dev->dev_addr;
2145         return 0;
2146 }
2147
2148 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2149 {
2150         if (dev->addr_len != INFINIBAND_ALEN)
2151                 return -1;
2152         memcpy(eui, dev->dev_addr + 12, 8);
2153         eui[0] |= 2;
2154         return 0;
2155 }
2156
2157 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2158 {
2159         if (addr == 0)
2160                 return -1;
2161         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2162                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2163                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2164                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2165                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2166                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2167         eui[1] = 0;
2168         eui[2] = 0x5E;
2169         eui[3] = 0xFE;
2170         memcpy(eui + 4, &addr, 4);
2171         return 0;
2172 }
2173
2174 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2175 {
2176         if (dev->priv_flags & IFF_ISATAP)
2177                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2178         return -1;
2179 }
2180
2181 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2182 {
2183         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2184 }
2185
2186 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2187 {
2188         memcpy(eui, dev->perm_addr, 3);
2189         memcpy(eui + 5, dev->perm_addr + 3, 3);
2190         eui[3] = 0xFF;
2191         eui[4] = 0xFE;
2192         eui[0] ^= 2;
2193         return 0;
2194 }
2195
2196 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2197 {
2198         switch (dev->type) {
2199         case ARPHRD_ETHER:
2200         case ARPHRD_FDDI:
2201                 return addrconf_ifid_eui48(eui, dev);
2202         case ARPHRD_ARCNET:
2203                 return addrconf_ifid_arcnet(eui, dev);
2204         case ARPHRD_INFINIBAND:
2205                 return addrconf_ifid_infiniband(eui, dev);
2206         case ARPHRD_SIT:
2207                 return addrconf_ifid_sit(eui, dev);
2208         case ARPHRD_IPGRE:
2209         case ARPHRD_TUNNEL:
2210                 return addrconf_ifid_gre(eui, dev);
2211         case ARPHRD_6LOWPAN:
2212                 return addrconf_ifid_6lowpan(eui, dev);
2213         case ARPHRD_IEEE1394:
2214                 return addrconf_ifid_ieee1394(eui, dev);
2215         case ARPHRD_TUNNEL6:
2216         case ARPHRD_IP6GRE:
2217                 return addrconf_ifid_ip6tnl(eui, dev);
2218         }
2219         return -1;
2220 }
2221
2222 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2223 {
2224         int err = -1;
2225         struct inet6_ifaddr *ifp;
2226
2227         read_lock_bh(&idev->lock);
2228         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2229                 if (ifp->scope > IFA_LINK)
2230                         break;
2231                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2232                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2233                         err = 0;
2234                         break;
2235                 }
2236         }
2237         read_unlock_bh(&idev->lock);
2238         return err;
2239 }
2240
2241 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2242 static void ipv6_regen_rndid(struct inet6_dev *idev)
2243 {
2244 regen:
2245         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2246         idev->rndid[0] &= ~0x02;
2247
2248         /*
2249          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2250          * check if generated address is not inappropriate
2251          *
2252          *  - Reserved subnet anycast (RFC 2526)
2253          *      11111101 11....11 1xxxxxxx
2254          *  - ISATAP (RFC4214) 6.1
2255          *      00-00-5E-FE-xx-xx-xx-xx
2256          *  - value 0
2257          *  - XXX: already assigned to an address on the device
2258          */
2259         if (idev->rndid[0] == 0xfd &&
2260             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2261             (idev->rndid[7]&0x80))
2262                 goto regen;
2263         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2264                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2265                         goto regen;
2266                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2267                         goto regen;
2268         }
2269 }
2270
2271 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2272 {
2273         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2274                 ipv6_regen_rndid(idev);
2275 }
2276
2277 /*
2278  *      Add prefix route.
2279  */
2280
2281 static void
2282 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2283                       unsigned long expires, u32 flags)
2284 {
2285         struct fib6_config cfg = {
2286                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2287                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2288                 .fc_ifindex = dev->ifindex,
2289                 .fc_expires = expires,
2290                 .fc_dst_len = plen,
2291                 .fc_flags = RTF_UP | flags,
2292                 .fc_nlinfo.nl_net = dev_net(dev),
2293                 .fc_protocol = RTPROT_KERNEL,
2294         };
2295
2296         cfg.fc_dst = *pfx;
2297
2298         /* Prevent useless cloning on PtP SIT.
2299            This thing is done here expecting that the whole
2300            class of non-broadcast devices need not cloning.
2301          */
2302 #if IS_ENABLED(CONFIG_IPV6_SIT)
2303         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2304                 cfg.fc_flags |= RTF_NONEXTHOP;
2305 #endif
2306
2307         ip6_route_add(&cfg, NULL);
2308 }
2309
2310
2311 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2312                                                   int plen,
2313                                                   const struct net_device *dev,
2314                                                   u32 flags, u32 noflags)
2315 {
2316         struct fib6_node *fn;
2317         struct rt6_info *rt = NULL;
2318         struct fib6_table *table;
2319         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2320
2321         table = fib6_get_table(dev_net(dev), tb_id);
2322         if (!table)
2323                 return NULL;
2324
2325         read_lock_bh(&table->tb6_lock);
2326         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2327         if (!fn)
2328                 goto out;
2329
2330         noflags |= RTF_CACHE;
2331         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2332                 if (rt->dst.dev->ifindex != dev->ifindex)
2333                         continue;
2334                 if ((rt->rt6i_flags & flags) != flags)
2335                         continue;
2336                 if ((rt->rt6i_flags & noflags) != 0)
2337                         continue;
2338                 dst_hold(&rt->dst);
2339                 break;
2340         }
2341 out:
2342         read_unlock_bh(&table->tb6_lock);
2343         return rt;
2344 }
2345
2346
2347 /* Create "default" multicast route to the interface */
2348
2349 static void addrconf_add_mroute(struct net_device *dev)
2350 {
2351         struct fib6_config cfg = {
2352                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2353                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2354                 .fc_ifindex = dev->ifindex,
2355                 .fc_dst_len = 8,
2356                 .fc_flags = RTF_UP,
2357                 .fc_nlinfo.nl_net = dev_net(dev),
2358                 .fc_protocol = RTPROT_KERNEL,
2359         };
2360
2361         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2362
2363         ip6_route_add(&cfg, NULL);
2364 }
2365
2366 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2367 {
2368         struct inet6_dev *idev;
2369
2370         ASSERT_RTNL();
2371
2372         idev = ipv6_find_idev(dev);
2373         if (!idev)
2374                 return ERR_PTR(-ENOBUFS);
2375
2376         if (idev->cnf.disable_ipv6)
2377                 return ERR_PTR(-EACCES);
2378
2379         /* Add default multicast route */
2380         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2381                 addrconf_add_mroute(dev);
2382
2383         return idev;
2384 }
2385
2386 static void manage_tempaddrs(struct inet6_dev *idev,
2387                              struct inet6_ifaddr *ifp,
2388                              __u32 valid_lft, __u32 prefered_lft,
2389                              bool create, unsigned long now)
2390 {
2391         u32 flags;
2392         struct inet6_ifaddr *ift;
2393
2394         read_lock_bh(&idev->lock);
2395         /* update all temporary addresses in the list */
2396         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2397                 int age, max_valid, max_prefered;
2398
2399                 if (ifp != ift->ifpub)
2400                         continue;
2401
2402                 /* RFC 4941 section 3.3:
2403                  * If a received option will extend the lifetime of a public
2404                  * address, the lifetimes of temporary addresses should
2405                  * be extended, subject to the overall constraint that no
2406                  * temporary addresses should ever remain "valid" or "preferred"
2407                  * for a time longer than (TEMP_VALID_LIFETIME) or
2408                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2409                  */
2410                 age = (now - ift->cstamp) / HZ;
2411                 max_valid = idev->cnf.temp_valid_lft - age;
2412                 if (max_valid < 0)
2413                         max_valid = 0;
2414
2415                 max_prefered = idev->cnf.temp_prefered_lft -
2416                                idev->desync_factor - age;
2417                 if (max_prefered < 0)
2418                         max_prefered = 0;
2419
2420                 if (valid_lft > max_valid)
2421                         valid_lft = max_valid;
2422
2423                 if (prefered_lft > max_prefered)
2424                         prefered_lft = max_prefered;
2425
2426                 spin_lock(&ift->lock);
2427                 flags = ift->flags;
2428                 ift->valid_lft = valid_lft;
2429                 ift->prefered_lft = prefered_lft;
2430                 ift->tstamp = now;
2431                 if (prefered_lft > 0)
2432                         ift->flags &= ~IFA_F_DEPRECATED;
2433
2434                 spin_unlock(&ift->lock);
2435                 if (!(flags&IFA_F_TENTATIVE))
2436                         ipv6_ifa_notify(0, ift);
2437         }
2438
2439         /* Also create a temporary address if it's enabled but no temporary
2440          * address currently exists.
2441          * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2442          * as part of cleanup (ie. deleting the mngtmpaddr).
2443          * We don't want that to result in creating a new temporary ip address.
2444          */
2445         if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2446                 create = true;
2447
2448         if (create && idev->cnf.use_tempaddr > 0) {
2449                 /* When a new public address is created as described
2450                  * in [ADDRCONF], also create a new temporary address.
2451                  */
2452                 read_unlock_bh(&idev->lock);
2453                 ipv6_create_tempaddr(ifp, NULL);
2454         } else {
2455                 read_unlock_bh(&idev->lock);
2456         }
2457 }
2458
2459 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2460 {
2461         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2462                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2463 }
2464
2465 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2466                                  const struct prefix_info *pinfo,
2467                                  struct inet6_dev *in6_dev,
2468                                  const struct in6_addr *addr, int addr_type,
2469                                  u32 addr_flags, bool sllao, bool tokenized,
2470                                  __u32 valid_lft, u32 prefered_lft)
2471 {
2472         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2473         int create = 0, update_lft = 0;
2474
2475         if (!ifp && valid_lft) {
2476                 int max_addresses = in6_dev->cnf.max_addresses;
2477
2478 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2479                 if ((net->ipv6.devconf_all->optimistic_dad ||
2480                      in6_dev->cnf.optimistic_dad) &&
2481                     !net->ipv6.devconf_all->forwarding && sllao)
2482                         addr_flags |= IFA_F_OPTIMISTIC;
2483 #endif
2484
2485                 /* Do not allow to create too much of autoconfigured
2486                  * addresses; this would be too easy way to crash kernel.
2487                  */
2488                 if (!max_addresses ||
2489                     ipv6_count_addresses(in6_dev) < max_addresses)
2490                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2491                                             pinfo->prefix_len,
2492                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2493                                             addr_flags, valid_lft,
2494                                             prefered_lft);
2495
2496                 if (IS_ERR_OR_NULL(ifp))
2497                         return -1;
2498
2499                 update_lft = 0;
2500                 create = 1;
2501                 spin_lock_bh(&ifp->lock);
2502                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2503                 ifp->cstamp = jiffies;
2504                 ifp->tokenized = tokenized;
2505                 spin_unlock_bh(&ifp->lock);
2506                 addrconf_dad_start(ifp);
2507         }
2508
2509         if (ifp) {
2510                 u32 flags;
2511                 unsigned long now;
2512                 u32 stored_lft;
2513
2514                 /* update lifetime (RFC2462 5.5.3 e) */
2515                 spin_lock_bh(&ifp->lock);
2516                 now = jiffies;
2517                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2518                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2519                 else
2520                         stored_lft = 0;
2521                 if (!update_lft && !create && stored_lft) {
2522                         const u32 minimum_lft = min_t(u32,
2523                                 stored_lft, MIN_VALID_LIFETIME);
2524                         valid_lft = max(valid_lft, minimum_lft);
2525
2526                         /* RFC4862 Section 5.5.3e:
2527                          * "Note that the preferred lifetime of the
2528                          *  corresponding address is always reset to
2529                          *  the Preferred Lifetime in the received
2530                          *  Prefix Information option, regardless of
2531                          *  whether the valid lifetime is also reset or
2532                          *  ignored."
2533                          *
2534                          * So we should always update prefered_lft here.
2535                          */
2536                         update_lft = 1;
2537                 }
2538
2539                 if (update_lft) {
2540                         ifp->valid_lft = valid_lft;
2541                         ifp->prefered_lft = prefered_lft;
2542                         ifp->tstamp = now;
2543                         flags = ifp->flags;
2544                         ifp->flags &= ~IFA_F_DEPRECATED;
2545                         spin_unlock_bh(&ifp->lock);
2546
2547                         if (!(flags&IFA_F_TENTATIVE))
2548                                 ipv6_ifa_notify(0, ifp);
2549                 } else
2550                         spin_unlock_bh(&ifp->lock);
2551
2552                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2553                                  create, now);
2554
2555                 in6_ifa_put(ifp);
2556                 addrconf_verify();
2557         }
2558
2559         return 0;
2560 }
2561 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2562
2563 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2564 {
2565         struct prefix_info *pinfo;
2566         __u32 valid_lft;
2567         __u32 prefered_lft;
2568         int addr_type, err;
2569         u32 addr_flags = 0;
2570         struct inet6_dev *in6_dev;
2571         struct net *net = dev_net(dev);
2572
2573         pinfo = (struct prefix_info *) opt;
2574
2575         if (len < sizeof(struct prefix_info)) {
2576                 ADBG("addrconf: prefix option too short\n");
2577                 return;
2578         }
2579
2580         /*
2581          *      Validation checks ([ADDRCONF], page 19)
2582          */
2583
2584         addr_type = ipv6_addr_type(&pinfo->prefix);
2585
2586         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2587                 return;
2588
2589         valid_lft = ntohl(pinfo->valid);
2590         prefered_lft = ntohl(pinfo->prefered);
2591
2592         if (prefered_lft > valid_lft) {
2593                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2594                 return;
2595         }
2596
2597         in6_dev = in6_dev_get(dev);
2598
2599         if (!in6_dev) {
2600                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2601                                     dev->name);
2602                 return;
2603         }
2604
2605         /*
2606          *      Two things going on here:
2607          *      1) Add routes for on-link prefixes
2608          *      2) Configure prefixes with the auto flag set
2609          */
2610
2611         if (pinfo->onlink) {
2612                 struct rt6_info *rt;
2613                 unsigned long rt_expires;
2614
2615                 /* Avoid arithmetic overflow. Really, we could
2616                  * save rt_expires in seconds, likely valid_lft,
2617                  * but it would require division in fib gc, that it
2618                  * not good.
2619                  */
2620                 if (HZ > USER_HZ)
2621                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2622                 else
2623                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2624
2625                 if (addrconf_finite_timeout(rt_expires))
2626                         rt_expires *= HZ;
2627
2628                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2629                                                pinfo->prefix_len,
2630                                                dev,
2631                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2632                                                RTF_GATEWAY | RTF_DEFAULT);
2633
2634                 if (rt) {
2635                         /* Autoconf prefix route */
2636                         if (valid_lft == 0) {
2637                                 ip6_del_rt(rt);
2638                                 rt = NULL;
2639                         } else if (addrconf_finite_timeout(rt_expires)) {
2640                                 /* not infinity */
2641                                 rt6_set_expires(rt, jiffies + rt_expires);
2642                         } else {
2643                                 rt6_clean_expires(rt);
2644                         }
2645                 } else if (valid_lft) {
2646                         clock_t expires = 0;
2647                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2648                         if (addrconf_finite_timeout(rt_expires)) {
2649                                 /* not infinity */
2650                                 flags |= RTF_EXPIRES;
2651                                 expires = jiffies_to_clock_t(rt_expires);
2652                         }
2653                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2654                                               dev, expires, flags);
2655                 }
2656                 ip6_rt_put(rt);
2657         }
2658
2659         /* Try to figure out our local address for this prefix */
2660
2661         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2662                 struct in6_addr addr;
2663                 bool tokenized = false, dev_addr_generated = false;
2664
2665                 if (pinfo->prefix_len == 64) {
2666                         memcpy(&addr, &pinfo->prefix, 8);
2667
2668                         if (!ipv6_addr_any(&in6_dev->token)) {
2669                                 read_lock_bh(&in6_dev->lock);
2670                                 memcpy(addr.s6_addr + 8,
2671                                        in6_dev->token.s6_addr + 8, 8);
2672                                 read_unlock_bh(&in6_dev->lock);
2673                                 tokenized = true;
2674                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2675                                    !ipv6_generate_stable_address(&addr, 0,
2676                                                                  in6_dev)) {
2677                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2678                                 goto ok;
2679                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2680                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2681                                 goto put;
2682                         } else {
2683                                 dev_addr_generated = true;
2684                         }
2685                         goto ok;
2686                 }
2687                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2688                                     pinfo->prefix_len);
2689                 goto put;
2690
2691 ok:
2692                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2693                                                    &addr, addr_type,
2694                                                    addr_flags, sllao,
2695                                                    tokenized, valid_lft,
2696                                                    prefered_lft);
2697                 if (err)
2698                         goto put;
2699
2700                 /* Ignore error case here because previous prefix add addr was
2701                  * successful which will be notified.
2702                  */
2703                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2704                                               addr_type, addr_flags, sllao,
2705                                               tokenized, valid_lft,
2706                                               prefered_lft,
2707                                               dev_addr_generated);
2708         }
2709         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2710 put:
2711         in6_dev_put(in6_dev);
2712 }
2713
2714 /*
2715  *      Set destination address.
2716  *      Special case for SIT interfaces where we create a new "virtual"
2717  *      device.
2718  */
2719 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2720 {
2721         struct in6_ifreq ireq;
2722         struct net_device *dev;
2723         int err = -EINVAL;
2724
2725         rtnl_lock();
2726
2727         err = -EFAULT;
2728         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2729                 goto err_exit;
2730
2731         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2732
2733         err = -ENODEV;
2734         if (!dev)
2735                 goto err_exit;
2736
2737 #if IS_ENABLED(CONFIG_IPV6_SIT)
2738         if (dev->type == ARPHRD_SIT) {
2739                 const struct net_device_ops *ops = dev->netdev_ops;
2740                 struct ifreq ifr;
2741                 struct ip_tunnel_parm p;
2742
2743                 err = -EADDRNOTAVAIL;
2744                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2745                         goto err_exit;
2746
2747                 memset(&p, 0, sizeof(p));
2748                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2749                 p.iph.saddr = 0;
2750                 p.iph.version = 4;
2751                 p.iph.ihl = 5;
2752                 p.iph.protocol = IPPROTO_IPV6;
2753                 p.iph.ttl = 64;
2754                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2755
2756                 if (ops->ndo_do_ioctl) {
2757                         mm_segment_t oldfs = get_fs();
2758
2759                         set_fs(KERNEL_DS);
2760                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2761                         set_fs(oldfs);
2762                 } else
2763                         err = -EOPNOTSUPP;
2764
2765                 if (err == 0) {
2766                         err = -ENOBUFS;
2767                         dev = __dev_get_by_name(net, p.name);
2768                         if (!dev)
2769                                 goto err_exit;
2770                         err = dev_open(dev);
2771                 }
2772         }
2773 #endif
2774
2775 err_exit:
2776         rtnl_unlock();
2777         return err;
2778 }
2779
2780 static int ipv6_mc_config(struct sock *sk, bool join,
2781                           const struct in6_addr *addr, int ifindex)
2782 {
2783         int ret;
2784
2785         ASSERT_RTNL();
2786
2787         lock_sock(sk);
2788         if (join)
2789                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2790         else
2791                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2792         release_sock(sk);
2793
2794         return ret;
2795 }
2796
2797 /*
2798  *      Manual configuration of address on an interface
2799  */
2800 static int inet6_addr_add(struct net *net, int ifindex,
2801                           const struct in6_addr *pfx,
2802                           const struct in6_addr *peer_pfx,
2803                           unsigned int plen, __u32 ifa_flags,
2804                           __u32 prefered_lft, __u32 valid_lft)
2805 {
2806         struct inet6_ifaddr *ifp;
2807         struct inet6_dev *idev;
2808         struct net_device *dev;
2809         unsigned long timeout;
2810         clock_t expires;
2811         int scope;
2812         u32 flags;
2813
2814         ASSERT_RTNL();
2815
2816         if (plen > 128)
2817                 return -EINVAL;
2818
2819         /* check the lifetime */
2820         if (!valid_lft || prefered_lft > valid_lft)
2821                 return -EINVAL;
2822
2823         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2824                 return -EINVAL;
2825
2826         dev = __dev_get_by_index(net, ifindex);
2827         if (!dev)
2828                 return -ENODEV;
2829
2830         idev = addrconf_add_dev(dev);
2831         if (IS_ERR(idev))
2832                 return PTR_ERR(idev);
2833
2834         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2835                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2836                                          true, pfx, ifindex);
2837
2838                 if (ret < 0)
2839                         return ret;
2840         }
2841
2842         scope = ipv6_addr_scope(pfx);
2843
2844         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2845         if (addrconf_finite_timeout(timeout)) {
2846                 expires = jiffies_to_clock_t(timeout * HZ);
2847                 valid_lft = timeout;
2848                 flags = RTF_EXPIRES;
2849         } else {
2850                 expires = 0;
2851                 flags = 0;
2852                 ifa_flags |= IFA_F_PERMANENT;
2853         }
2854
2855         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2856         if (addrconf_finite_timeout(timeout)) {
2857                 if (timeout == 0)
2858                         ifa_flags |= IFA_F_DEPRECATED;
2859                 prefered_lft = timeout;
2860         }
2861
2862         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2863                             valid_lft, prefered_lft);
2864
2865         if (!IS_ERR(ifp)) {
2866                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2867                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2868                                               expires, flags);
2869                 }
2870
2871                 /*
2872                  * Note that section 3.1 of RFC 4429 indicates
2873                  * that the Optimistic flag should not be set for
2874                  * manually configured addresses
2875                  */
2876                 addrconf_dad_start(ifp);
2877                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2878                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2879                                          true, jiffies);
2880                 in6_ifa_put(ifp);
2881                 addrconf_verify_rtnl();
2882                 return 0;
2883         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2884                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2885                                false, pfx, ifindex);
2886         }
2887
2888         return PTR_ERR(ifp);
2889 }
2890
2891 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2892                           const struct in6_addr *pfx, unsigned int plen)
2893 {
2894         struct inet6_ifaddr *ifp;
2895         struct inet6_dev *idev;
2896         struct net_device *dev;
2897
2898         if (plen > 128)
2899                 return -EINVAL;
2900
2901         dev = __dev_get_by_index(net, ifindex);
2902         if (!dev)
2903                 return -ENODEV;
2904
2905         idev = __in6_dev_get(dev);
2906         if (!idev)
2907                 return -ENXIO;
2908
2909         read_lock_bh(&idev->lock);
2910         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2911                 if (ifp->prefix_len == plen &&
2912                     ipv6_addr_equal(pfx, &ifp->addr)) {
2913                         in6_ifa_hold(ifp);
2914                         read_unlock_bh(&idev->lock);
2915
2916                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2917                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2918                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2919                                                  jiffies);
2920                         ipv6_del_addr(ifp);
2921                         addrconf_verify_rtnl();
2922                         if (ipv6_addr_is_multicast(pfx)) {
2923                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2924                                                false, pfx, dev->ifindex);
2925                         }
2926                         return 0;
2927                 }
2928         }
2929         read_unlock_bh(&idev->lock);
2930         return -EADDRNOTAVAIL;
2931 }
2932
2933
2934 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2935 {
2936         struct in6_ifreq ireq;
2937         int err;
2938
2939         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2940                 return -EPERM;
2941
2942         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2943                 return -EFAULT;
2944
2945         rtnl_lock();
2946         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2947                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2948                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2949         rtnl_unlock();
2950         return err;
2951 }
2952
2953 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2954 {
2955         struct in6_ifreq ireq;
2956         int err;
2957
2958         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2959                 return -EPERM;
2960
2961         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2962                 return -EFAULT;
2963
2964         rtnl_lock();
2965         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2966                              ireq.ifr6_prefixlen);
2967         rtnl_unlock();
2968         return err;
2969 }
2970
2971 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2972                      int plen, int scope)
2973 {
2974         struct inet6_ifaddr *ifp;
2975
2976         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2977                             scope, IFA_F_PERMANENT,
2978                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2979         if (!IS_ERR(ifp)) {
2980                 spin_lock_bh(&ifp->lock);
2981                 ifp->flags &= ~IFA_F_TENTATIVE;
2982                 spin_unlock_bh(&ifp->lock);
2983                 rt_genid_bump_ipv6(dev_net(idev->dev));
2984                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2985                 in6_ifa_put(ifp);
2986         }
2987 }
2988
2989 #if IS_ENABLED(CONFIG_IPV6_SIT)
2990 static void sit_add_v4_addrs(struct inet6_dev *idev)
2991 {
2992         struct in6_addr addr;
2993         struct net_device *dev;
2994         struct net *net = dev_net(idev->dev);
2995         int scope, plen;
2996         u32 pflags = 0;
2997
2998         ASSERT_RTNL();
2999
3000         memset(&addr, 0, sizeof(struct in6_addr));
3001         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3002
3003         if (idev->dev->flags&IFF_POINTOPOINT) {
3004                 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3005                         return;
3006
3007                 addr.s6_addr32[0] = htonl(0xfe800000);
3008                 scope = IFA_LINK;
3009                 plen = 64;
3010         } else {
3011                 scope = IPV6_ADDR_COMPATv4;
3012                 plen = 96;
3013                 pflags |= RTF_NONEXTHOP;
3014         }
3015
3016         if (addr.s6_addr32[3]) {
3017                 add_addr(idev, &addr, plen, scope);
3018                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
3019                 return;
3020         }
3021
3022         for_each_netdev(net, dev) {
3023                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3024                 if (in_dev && (dev->flags & IFF_UP)) {
3025                         struct in_ifaddr *ifa;
3026
3027                         int flag = scope;
3028
3029                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3030
3031                                 addr.s6_addr32[3] = ifa->ifa_local;
3032
3033                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3034                                         continue;
3035                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3036                                         if (idev->dev->flags&IFF_POINTOPOINT)
3037                                                 continue;
3038                                         flag |= IFA_HOST;
3039                                 }
3040
3041                                 add_addr(idev, &addr, plen, flag);
3042                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3043                                                       pflags);
3044                         }
3045                 }
3046         }
3047 }
3048 #endif
3049
3050 static void init_loopback(struct net_device *dev)
3051 {
3052         struct inet6_dev  *idev;
3053
3054         /* ::1 */
3055
3056         ASSERT_RTNL();
3057
3058         idev = ipv6_find_idev(dev);
3059         if (!idev) {
3060                 pr_debug("%s: add_dev failed\n", __func__);
3061                 return;
3062         }
3063
3064         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3065 }
3066
3067 void addrconf_add_linklocal(struct inet6_dev *idev,
3068                             const struct in6_addr *addr, u32 flags)
3069 {
3070         struct inet6_ifaddr *ifp;
3071         u32 addr_flags = flags | IFA_F_PERMANENT;
3072
3073 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3074         if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3075              idev->cnf.optimistic_dad) &&
3076             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3077                 addr_flags |= IFA_F_OPTIMISTIC;
3078 #endif
3079
3080         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3081                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3082         if (!IS_ERR(ifp)) {
3083                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3084                 addrconf_dad_start(ifp);
3085                 in6_ifa_put(ifp);
3086         }
3087 }
3088 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3089
3090 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3091 {
3092         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3093                 return true;
3094
3095         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3096             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3097                 return true;
3098
3099         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3100             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3101                 return true;
3102
3103         return false;
3104 }
3105
3106 static int ipv6_generate_stable_address(struct in6_addr *address,
3107                                         u8 dad_count,
3108                                         const struct inet6_dev *idev)
3109 {
3110         static DEFINE_SPINLOCK(lock);
3111         static __u32 digest[SHA_DIGEST_WORDS];
3112         static __u32 workspace[SHA_WORKSPACE_WORDS];
3113
3114         static union {
3115                 char __data[SHA_MESSAGE_BYTES];
3116                 struct {
3117                         struct in6_addr secret;
3118                         __be32 prefix[2];
3119                         unsigned char hwaddr[MAX_ADDR_LEN];
3120                         u8 dad_count;
3121                 } __packed;
3122         } data;
3123
3124         struct in6_addr secret;
3125         struct in6_addr temp;
3126         struct net *net = dev_net(idev->dev);
3127
3128         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3129
3130         if (idev->cnf.stable_secret.initialized)
3131                 secret = idev->cnf.stable_secret.secret;
3132         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3133                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3134         else
3135                 return -1;
3136
3137 retry:
3138         spin_lock_bh(&lock);
3139
3140         sha_init(digest);
3141         memset(&data, 0, sizeof(data));
3142         memset(workspace, 0, sizeof(workspace));
3143         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3144         data.prefix[0] = address->s6_addr32[0];
3145         data.prefix[1] = address->s6_addr32[1];
3146         data.secret = secret;
3147         data.dad_count = dad_count;
3148
3149         sha_transform(digest, data.__data, workspace);
3150
3151         temp = *address;
3152         temp.s6_addr32[2] = (__force __be32)digest[0];
3153         temp.s6_addr32[3] = (__force __be32)digest[1];
3154
3155         spin_unlock_bh(&lock);
3156
3157         if (ipv6_reserved_interfaceid(temp)) {
3158                 dad_count++;
3159                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3160                         return -1;
3161                 goto retry;
3162         }
3163
3164         *address = temp;
3165         return 0;
3166 }
3167
3168 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3169 {
3170         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3171
3172         if (s->initialized)
3173                 return;
3174         s = &idev->cnf.stable_secret;
3175         get_random_bytes(&s->secret, sizeof(s->secret));
3176         s->initialized = true;
3177 }
3178
3179 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3180 {
3181         struct in6_addr addr;
3182
3183         /* no link local addresses on L3 master devices */
3184         if (netif_is_l3_master(idev->dev))
3185                 return;
3186
3187         /* no link local addresses on devices flagged as slaves */
3188         if (idev->dev->flags & IFF_SLAVE)
3189                 return;
3190
3191         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3192
3193         switch (idev->cnf.addr_gen_mode) {
3194         case IN6_ADDR_GEN_MODE_RANDOM:
3195                 ipv6_gen_mode_random_init(idev);
3196                 /* fallthrough */
3197         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3198                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3199                         addrconf_add_linklocal(idev, &addr,
3200                                                IFA_F_STABLE_PRIVACY);
3201                 else if (prefix_route)
3202                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3203                 break;
3204         case IN6_ADDR_GEN_MODE_EUI64:
3205                 /* addrconf_add_linklocal also adds a prefix_route and we
3206                  * only need to care about prefix routes if ipv6_generate_eui64
3207                  * couldn't generate one.
3208                  */
3209                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3210                         addrconf_add_linklocal(idev, &addr, 0);
3211                 else if (prefix_route)
3212                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3213                 break;
3214         case IN6_ADDR_GEN_MODE_NONE:
3215         default:
3216                 /* will not add any link local address */
3217                 break;
3218         }
3219 }
3220
3221 static void addrconf_dev_config(struct net_device *dev)
3222 {
3223         struct inet6_dev *idev;
3224
3225         ASSERT_RTNL();
3226
3227         if ((dev->type != ARPHRD_ETHER) &&
3228             (dev->type != ARPHRD_FDDI) &&
3229             (dev->type != ARPHRD_ARCNET) &&
3230             (dev->type != ARPHRD_INFINIBAND) &&
3231             (dev->type != ARPHRD_IEEE1394) &&
3232             (dev->type != ARPHRD_TUNNEL6) &&
3233             (dev->type != ARPHRD_6LOWPAN) &&
3234             (dev->type != ARPHRD_IP6GRE) &&
3235             (dev->type != ARPHRD_IPGRE) &&
3236             (dev->type != ARPHRD_TUNNEL) &&
3237             (dev->type != ARPHRD_NONE)) {
3238                 /* Alas, we support only Ethernet autoconfiguration. */
3239                 idev = __in6_dev_get(dev);
3240                 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3241                     dev->flags & IFF_MULTICAST)
3242                         ipv6_mc_up(idev);
3243                 return;
3244         }
3245
3246         idev = addrconf_add_dev(dev);
3247         if (IS_ERR(idev))
3248                 return;
3249
3250         /* this device type has no EUI support */
3251         if (dev->type == ARPHRD_NONE &&
3252             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3253                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3254
3255         addrconf_addr_gen(idev, false);
3256 }
3257
3258 #if IS_ENABLED(CONFIG_IPV6_SIT)
3259 static void addrconf_sit_config(struct net_device *dev)
3260 {
3261         struct inet6_dev *idev;
3262
3263         ASSERT_RTNL();
3264
3265         /*
3266          * Configure the tunnel with one of our IPv4
3267          * addresses... we should configure all of
3268          * our v4 addrs in the tunnel
3269          */
3270
3271         idev = ipv6_find_idev(dev);
3272         if (!idev) {
3273                 pr_debug("%s: add_dev failed\n", __func__);
3274                 return;
3275         }
3276
3277         if (dev->priv_flags & IFF_ISATAP) {
3278                 addrconf_addr_gen(idev, false);
3279                 return;
3280         }
3281
3282         sit_add_v4_addrs(idev);
3283
3284         if (dev->flags&IFF_POINTOPOINT)
3285                 addrconf_add_mroute(dev);
3286 }
3287 #endif
3288
3289 #if IS_ENABLED(CONFIG_NET_IPGRE)
3290 static void addrconf_gre_config(struct net_device *dev)
3291 {
3292         struct inet6_dev *idev;
3293
3294         ASSERT_RTNL();
3295
3296         idev = ipv6_find_idev(dev);
3297         if (!idev) {
3298                 pr_debug("%s: add_dev failed\n", __func__);
3299                 return;
3300         }
3301
3302         addrconf_addr_gen(idev, true);
3303         if (dev->flags & IFF_POINTOPOINT)
3304                 addrconf_add_mroute(dev);
3305 }
3306 #endif
3307
3308 static int fixup_permanent_addr(struct inet6_dev *idev,
3309                                 struct inet6_ifaddr *ifp)
3310 {
3311         /* !rt6i_node means the host route was removed from the
3312          * FIB, for example, if 'lo' device is taken down. In that
3313          * case regenerate the host route.
3314          */
3315         if (!ifp->rt || !ifp->rt->rt6i_node) {
3316                 struct rt6_info *rt, *prev;
3317
3318                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3319                 if (unlikely(IS_ERR(rt)))
3320                         return PTR_ERR(rt);
3321
3322                 /* ifp->rt can be accessed outside of rtnl */
3323                 spin_lock(&ifp->lock);
3324                 prev = ifp->rt;
3325                 ifp->rt = rt;
3326                 spin_unlock(&ifp->lock);
3327
3328                 ip6_rt_put(prev);
3329         }
3330
3331         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3332                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3333                                       idev->dev, 0, 0);
3334         }
3335
3336         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3337                 addrconf_dad_start(ifp);
3338
3339         return 0;
3340 }
3341
3342 static void addrconf_permanent_addr(struct net_device *dev)
3343 {
3344         struct inet6_ifaddr *ifp, *tmp;
3345         struct inet6_dev *idev;
3346
3347         idev = __in6_dev_get(dev);
3348         if (!idev)
3349                 return;
3350
3351         write_lock_bh(&idev->lock);
3352
3353         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3354                 if ((ifp->flags & IFA_F_PERMANENT) &&
3355                     fixup_permanent_addr(idev, ifp) < 0) {
3356                         write_unlock_bh(&idev->lock);
3357                         in6_ifa_hold(ifp);
3358                         ipv6_del_addr(ifp);
3359                         write_lock_bh(&idev->lock);
3360
3361                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3362                                              idev->dev->name, &ifp->addr);
3363                 }
3364         }
3365
3366         write_unlock_bh(&idev->lock);
3367 }
3368
3369 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3370                            void *ptr)
3371 {
3372         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3373         struct netdev_notifier_changeupper_info *info;
3374         struct inet6_dev *idev = __in6_dev_get(dev);
3375         struct net *net = dev_net(dev);
3376         int run_pending = 0;
3377         int err;
3378
3379         switch (event) {
3380         case NETDEV_REGISTER:
3381                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3382                         idev = ipv6_add_dev(dev);
3383                         if (IS_ERR(idev))
3384                                 return notifier_from_errno(PTR_ERR(idev));
3385                 }
3386                 break;
3387
3388         case NETDEV_CHANGEMTU:
3389                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3390                 if (dev->mtu < IPV6_MIN_MTU) {
3391                         addrconf_ifdown(dev, dev != net->loopback_dev);
3392                         break;
3393                 }
3394
3395                 if (idev) {
3396                         rt6_mtu_change(dev, dev->mtu);
3397                         idev->cnf.mtu6 = dev->mtu;
3398                         break;
3399                 }
3400
3401                 /* allocate new idev */
3402                 idev = ipv6_add_dev(dev);
3403                 if (IS_ERR(idev))
3404                         break;
3405
3406                 /* device is still not ready */
3407                 if (!(idev->if_flags & IF_READY))
3408                         break;
3409
3410                 run_pending = 1;
3411
3412                 /* fall through */
3413
3414         case NETDEV_UP:
3415         case NETDEV_CHANGE:
3416                 if (dev->flags & IFF_SLAVE)
3417                         break;
3418
3419                 if (idev && idev->cnf.disable_ipv6)
3420                         break;
3421
3422                 if (event == NETDEV_UP) {
3423                         /* restore routes for permanent addresses */
3424                         addrconf_permanent_addr(dev);
3425
3426                         if (!addrconf_link_ready(dev)) {
3427                                 /* device is not ready yet. */
3428                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3429                                         dev->name);
3430                                 break;
3431                         }
3432
3433                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3434                                 idev = ipv6_add_dev(dev);
3435
3436                         if (!IS_ERR_OR_NULL(idev)) {
3437                                 idev->if_flags |= IF_READY;
3438                                 run_pending = 1;
3439                         }
3440                 } else if (event == NETDEV_CHANGE) {
3441                         if (!addrconf_link_ready(dev)) {
3442                                 /* device is still not ready. */
3443                                 break;
3444                         }
3445
3446                         if (idev) {
3447                                 if (idev->if_flags & IF_READY) {
3448                                         /* device is already configured -
3449                                          * but resend MLD reports, we might
3450                                          * have roamed and need to update
3451                                          * multicast snooping switches
3452                                          */
3453                                         ipv6_mc_up(idev);
3454                                         break;
3455                                 }
3456                                 idev->if_flags |= IF_READY;
3457                         }
3458
3459                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3460                                 dev->name);
3461
3462                         run_pending = 1;
3463                 }
3464
3465                 switch (dev->type) {
3466 #if IS_ENABLED(CONFIG_IPV6_SIT)
3467                 case ARPHRD_SIT:
3468                         addrconf_sit_config(dev);
3469                         break;
3470 #endif
3471 #if IS_ENABLED(CONFIG_NET_IPGRE)
3472                 case ARPHRD_IPGRE:
3473                         addrconf_gre_config(dev);
3474                         break;
3475 #endif
3476                 case ARPHRD_LOOPBACK:
3477                         init_loopback(dev);
3478                         break;
3479
3480                 default:
3481                         addrconf_dev_config(dev);
3482                         break;
3483                 }
3484
3485                 if (!IS_ERR_OR_NULL(idev)) {
3486                         if (run_pending)
3487                                 addrconf_dad_run(idev);
3488
3489                         /*
3490                          * If the MTU changed during the interface down,
3491                          * when the interface up, the changed MTU must be
3492                          * reflected in the idev as well as routers.
3493                          */
3494                         if (idev->cnf.mtu6 != dev->mtu &&
3495                             dev->mtu >= IPV6_MIN_MTU) {
3496                                 rt6_mtu_change(dev, dev->mtu);
3497                                 idev->cnf.mtu6 = dev->mtu;
3498                         }
3499                         idev->tstamp = jiffies;
3500                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3501
3502                         /*
3503                          * If the changed mtu during down is lower than
3504                          * IPV6_MIN_MTU stop IPv6 on this interface.
3505                          */
3506                         if (dev->mtu < IPV6_MIN_MTU)
3507                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3508                 }
3509                 break;
3510
3511         case NETDEV_DOWN:
3512         case NETDEV_UNREGISTER:
3513                 /*
3514                  *      Remove all addresses from this interface.
3515                  */
3516                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3517                 break;
3518
3519         case NETDEV_CHANGENAME:
3520                 if (idev) {
3521                         snmp6_unregister_dev(idev);
3522                         addrconf_sysctl_unregister(idev);
3523                         err = addrconf_sysctl_register(idev);
3524                         if (err)
3525                                 return notifier_from_errno(err);
3526                         err = snmp6_register_dev(idev);
3527                         if (err) {
3528                                 addrconf_sysctl_unregister(idev);
3529                                 return notifier_from_errno(err);
3530                         }
3531                 }
3532                 break;
3533
3534         case NETDEV_PRE_TYPE_CHANGE:
3535         case NETDEV_POST_TYPE_CHANGE:
3536                 if (idev)
3537                         addrconf_type_change(dev, event);
3538                 break;
3539
3540         case NETDEV_CHANGEUPPER:
3541                 info = ptr;
3542
3543                 /* flush all routes if dev is linked to or unlinked from
3544                  * an L3 master device (e.g., VRF)
3545                  */
3546                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3547                         addrconf_ifdown(dev, 0);
3548         }
3549
3550         return NOTIFY_OK;
3551 }
3552
3553 /*
3554  *      addrconf module should be notified of a device going up
3555  */
3556 static struct notifier_block ipv6_dev_notf = {
3557         .notifier_call = addrconf_notify,
3558         .priority = ADDRCONF_NOTIFY_PRIORITY,
3559 };
3560
3561 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3562 {
3563         struct inet6_dev *idev;
3564         ASSERT_RTNL();
3565
3566         idev = __in6_dev_get(dev);
3567
3568         if (event == NETDEV_POST_TYPE_CHANGE)
3569                 ipv6_mc_remap(idev);
3570         else if (event == NETDEV_PRE_TYPE_CHANGE)
3571                 ipv6_mc_unmap(idev);
3572 }
3573
3574 static bool addr_is_local(const struct in6_addr *addr)
3575 {
3576         return ipv6_addr_type(addr) &
3577                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3578 }
3579
3580 static int addrconf_ifdown(struct net_device *dev, int how)
3581 {
3582         struct net *net = dev_net(dev);
3583         struct inet6_dev *idev;
3584         struct inet6_ifaddr *ifa, *tmp;
3585         struct list_head del_list;
3586         int _keep_addr;
3587         bool keep_addr;
3588         bool was_ready;
3589         int state, i;
3590
3591         ASSERT_RTNL();
3592
3593         rt6_ifdown(net, dev);
3594         neigh_ifdown(&nd_tbl, dev);
3595
3596         idev = __in6_dev_get(dev);
3597         if (!idev)
3598                 return -ENODEV;
3599
3600         /*
3601          * Step 1: remove reference to ipv6 device from parent device.
3602          *         Do not dev_put!
3603          */
3604         if (how) {
3605                 idev->dead = 1;
3606
3607                 /* protected by rtnl_lock */
3608                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3609
3610                 /* Step 1.5: remove snmp6 entry */
3611                 snmp6_unregister_dev(idev);
3612
3613         }
3614
3615         /* aggregate the system setting and interface setting */
3616         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3617         if (!_keep_addr)
3618                 _keep_addr = idev->cnf.keep_addr_on_down;
3619
3620         /* combine the user config with event to determine if permanent
3621          * addresses are to be removed from address hash table
3622          */
3623         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3624
3625         /* Step 2: clear hash table */
3626         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3627                 struct hlist_head *h = &inet6_addr_lst[i];
3628
3629                 spin_lock_bh(&addrconf_hash_lock);
3630 restart:
3631                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3632                         if (ifa->idev == idev) {
3633                                 addrconf_del_dad_work(ifa);
3634                                 /* combined flag + permanent flag decide if
3635                                  * address is retained on a down event
3636                                  */
3637                                 if (!keep_addr ||
3638                                     !(ifa->flags & IFA_F_PERMANENT) ||
3639                                     addr_is_local(&ifa->addr)) {
3640                                         hlist_del_init_rcu(&ifa->addr_lst);
3641                                         goto restart;
3642                                 }
3643                         }
3644                 }
3645                 spin_unlock_bh(&addrconf_hash_lock);
3646         }
3647
3648         write_lock_bh(&idev->lock);
3649
3650         addrconf_del_rs_timer(idev);
3651
3652         /* Step 2: clear flags for stateless addrconf, repeated down
3653          *         detection
3654          */
3655         was_ready = idev->if_flags & IF_READY;
3656         if (!how)
3657                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3658
3659         /* Step 3: clear tempaddr list */
3660         while (!list_empty(&idev->tempaddr_list)) {
3661                 ifa = list_first_entry(&idev->tempaddr_list,
3662                                        struct inet6_ifaddr, tmp_list);
3663                 list_del(&ifa->tmp_list);
3664                 write_unlock_bh(&idev->lock);
3665                 spin_lock_bh(&ifa->lock);
3666
3667                 if (ifa->ifpub) {
3668                         in6_ifa_put(ifa->ifpub);
3669                         ifa->ifpub = NULL;
3670                 }
3671                 spin_unlock_bh(&ifa->lock);
3672                 in6_ifa_put(ifa);
3673                 write_lock_bh(&idev->lock);
3674         }
3675
3676         /* re-combine the user config with event to determine if permanent
3677          * addresses are to be removed from the interface list
3678          */
3679         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3680
3681         INIT_LIST_HEAD(&del_list);
3682         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3683                 struct rt6_info *rt = NULL;
3684                 bool keep;
3685
3686                 addrconf_del_dad_work(ifa);
3687
3688                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3689                         !addr_is_local(&ifa->addr);
3690                 if (!keep)
3691                         list_move(&ifa->if_list, &del_list);
3692
3693                 write_unlock_bh(&idev->lock);
3694                 spin_lock_bh(&ifa->lock);
3695
3696                 if (keep) {
3697                         /* set state to skip the notifier below */
3698                         state = INET6_IFADDR_STATE_DEAD;
3699                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3700                         if (!(ifa->flags & IFA_F_NODAD))
3701                                 ifa->flags |= IFA_F_TENTATIVE;
3702
3703                         rt = ifa->rt;
3704                         ifa->rt = NULL;
3705                 } else {
3706                         state = ifa->state;
3707                         ifa->state = INET6_IFADDR_STATE_DEAD;
3708                 }
3709
3710                 spin_unlock_bh(&ifa->lock);
3711
3712                 if (rt)
3713                         ip6_del_rt(rt);
3714
3715                 if (state != INET6_IFADDR_STATE_DEAD) {
3716                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3717                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3718                 } else {
3719                         if (idev->cnf.forwarding)
3720                                 addrconf_leave_anycast(ifa);
3721                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3722                 }
3723
3724                 write_lock_bh(&idev->lock);
3725         }
3726
3727         write_unlock_bh(&idev->lock);
3728
3729         /* now clean up addresses to be removed */
3730         while (!list_empty(&del_list)) {
3731                 ifa = list_first_entry(&del_list,
3732                                        struct inet6_ifaddr, if_list);
3733                 list_del(&ifa->if_list);
3734
3735                 in6_ifa_put(ifa);
3736         }
3737
3738         /* Step 5: Discard anycast and multicast list */
3739         if (how) {
3740                 ipv6_ac_destroy_dev(idev);
3741                 ipv6_mc_destroy_dev(idev);
3742         } else if (was_ready) {
3743                 ipv6_mc_down(idev);
3744         }
3745
3746         idev->tstamp = jiffies;
3747
3748         /* Last: Shot the device (if unregistered) */
3749         if (how) {
3750                 addrconf_sysctl_unregister(idev);
3751                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3752                 neigh_ifdown(&nd_tbl, dev);
3753                 in6_dev_put(idev);
3754         }
3755         return 0;
3756 }
3757
3758 static void addrconf_rs_timer(unsigned long data)
3759 {
3760         struct inet6_dev *idev = (struct inet6_dev *)data;
3761         struct net_device *dev = idev->dev;
3762         struct in6_addr lladdr;
3763
3764         write_lock(&idev->lock);
3765         if (idev->dead || !(idev->if_flags & IF_READY))
3766                 goto out;
3767
3768         if (!ipv6_accept_ra(idev))
3769                 goto out;
3770
3771         /* Announcement received after solicitation was sent */
3772         if (idev->if_flags & IF_RA_RCVD)
3773                 goto out;
3774
3775         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3776                 write_unlock(&idev->lock);
3777                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3778                         ndisc_send_rs(dev, &lladdr,
3779                                       &in6addr_linklocal_allrouters);
3780                 else
3781                         goto put;
3782
3783                 write_lock(&idev->lock);
3784                 idev->rs_interval = rfc3315_s14_backoff_update(
3785                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3786                 /* The wait after the last probe can be shorter */
3787                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3788                                              idev->cnf.rtr_solicits) ?
3789                                       idev->cnf.rtr_solicit_delay :
3790                                       idev->rs_interval);
3791         } else {
3792                 /*
3793                  * Note: we do not support deprecated "all on-link"
3794                  * assumption any longer.
3795                  */
3796                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3797         }
3798
3799 out:
3800         write_unlock(&idev->lock);
3801 put:
3802         in6_dev_put(idev);
3803 }
3804
3805 /*
3806  *      Duplicate Address Detection
3807  */
3808 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3809 {
3810         unsigned long rand_num;
3811         struct inet6_dev *idev = ifp->idev;
3812         u64 nonce;
3813
3814         if (ifp->flags & IFA_F_OPTIMISTIC)
3815                 rand_num = 0;
3816         else
3817                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3818
3819         nonce = 0;
3820         if (idev->cnf.enhanced_dad ||
3821             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3822                 do
3823                         get_random_bytes(&nonce, 6);
3824                 while (nonce == 0);
3825         }
3826         ifp->dad_nonce = nonce;
3827         ifp->dad_probes = idev->cnf.dad_transmits;
3828         addrconf_mod_dad_work(ifp, rand_num);
3829 }
3830
3831 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3832 {
3833         struct inet6_dev *idev = ifp->idev;
3834         struct net_device *dev = idev->dev;
3835         bool bump_id, notify = false;
3836
3837         addrconf_join_solict(dev, &ifp->addr);
3838
3839         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3840
3841         read_lock_bh(&idev->lock);
3842         spin_lock(&ifp->lock);
3843         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3844                 goto out;
3845
3846         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3847             (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3848              idev->cnf.accept_dad < 1) ||
3849             !(ifp->flags&IFA_F_TENTATIVE) ||
3850             ifp->flags & IFA_F_NODAD) {
3851                 bool send_na = false;
3852
3853                 if (ifp->flags & IFA_F_TENTATIVE &&
3854                     !(ifp->flags & IFA_F_OPTIMISTIC))
3855                         send_na = true;
3856                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3857                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3858                 spin_unlock(&ifp->lock);
3859                 read_unlock_bh(&idev->lock);
3860
3861                 addrconf_dad_completed(ifp, bump_id, send_na);
3862                 return;
3863         }
3864
3865         if (!(idev->if_flags & IF_READY)) {
3866                 spin_unlock(&ifp->lock);
3867                 read_unlock_bh(&idev->lock);
3868                 /*
3869                  * If the device is not ready:
3870                  * - keep it tentative if it is a permanent address.
3871                  * - otherwise, kill it.
3872                  */
3873                 in6_ifa_hold(ifp);
3874                 addrconf_dad_stop(ifp, 0);
3875                 return;
3876         }
3877
3878         /*
3879          * Optimistic nodes can start receiving
3880          * Frames right away
3881          */
3882         if (ifp->flags & IFA_F_OPTIMISTIC) {
3883                 ip6_ins_rt(ifp->rt);
3884                 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
3885                         /* Because optimistic nodes can use this address,
3886                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3887                          */
3888                         notify = true;
3889                 }
3890         }
3891
3892         addrconf_dad_kick(ifp);
3893 out:
3894         spin_unlock(&ifp->lock);
3895         read_unlock_bh(&idev->lock);
3896         if (notify)
3897                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3898 }
3899
3900 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3901 {
3902         bool begin_dad = false;
3903
3904         spin_lock_bh(&ifp->lock);
3905         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3906                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3907                 begin_dad = true;
3908         }
3909         spin_unlock_bh(&ifp->lock);
3910
3911         if (begin_dad)
3912                 addrconf_mod_dad_work(ifp, 0);
3913 }
3914
3915 static void addrconf_dad_work(struct work_struct *w)
3916 {
3917         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3918                                                 struct inet6_ifaddr,
3919                                                 dad_work);
3920         struct inet6_dev *idev = ifp->idev;
3921         bool bump_id, disable_ipv6 = false;
3922         struct in6_addr mcaddr;
3923
3924         enum {
3925                 DAD_PROCESS,
3926                 DAD_BEGIN,
3927                 DAD_ABORT,
3928         } action = DAD_PROCESS;
3929
3930         rtnl_lock();
3931
3932         spin_lock_bh(&ifp->lock);
3933         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3934                 action = DAD_BEGIN;
3935                 ifp->state = INET6_IFADDR_STATE_DAD;
3936         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3937                 action = DAD_ABORT;
3938                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3939
3940                 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3941                      idev->cnf.accept_dad > 1) &&
3942                     !idev->cnf.disable_ipv6 &&
3943                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3944                         struct in6_addr addr;
3945
3946                         addr.s6_addr32[0] = htonl(0xfe800000);
3947                         addr.s6_addr32[1] = 0;
3948
3949                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3950                             ipv6_addr_equal(&ifp->addr, &addr)) {
3951                                 /* DAD failed for link-local based on MAC */
3952                                 idev->cnf.disable_ipv6 = 1;
3953
3954                                 pr_info("%s: IPv6 being disabled!\n",
3955                                         ifp->idev->dev->name);
3956                                 disable_ipv6 = true;
3957                         }
3958                 }
3959         }
3960         spin_unlock_bh(&ifp->lock);
3961
3962         if (action == DAD_BEGIN) {
3963                 addrconf_dad_begin(ifp);
3964                 goto out;
3965         } else if (action == DAD_ABORT) {
3966                 in6_ifa_hold(ifp);
3967                 addrconf_dad_stop(ifp, 1);
3968                 if (disable_ipv6)
3969                         addrconf_ifdown(idev->dev, 0);
3970                 goto out;
3971         }
3972
3973         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3974                 goto out;
3975
3976         write_lock_bh(&idev->lock);
3977         if (idev->dead || !(idev->if_flags & IF_READY)) {
3978                 write_unlock_bh(&idev->lock);
3979                 goto out;
3980         }
3981
3982         spin_lock(&ifp->lock);
3983         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3984                 spin_unlock(&ifp->lock);
3985                 write_unlock_bh(&idev->lock);
3986                 goto out;
3987         }
3988
3989         if (ifp->dad_probes == 0) {
3990                 bool send_na = false;
3991
3992                 /*
3993                  * DAD was successful
3994                  */
3995
3996                 if (ifp->flags & IFA_F_TENTATIVE &&
3997                     !(ifp->flags & IFA_F_OPTIMISTIC))
3998                         send_na = true;
3999                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4000                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4001                 spin_unlock(&ifp->lock);
4002                 write_unlock_bh(&idev->lock);
4003
4004                 addrconf_dad_completed(ifp, bump_id, send_na);
4005
4006                 goto out;
4007         }
4008
4009         ifp->dad_probes--;
4010         addrconf_mod_dad_work(ifp,
4011                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4012         spin_unlock(&ifp->lock);
4013         write_unlock_bh(&idev->lock);
4014
4015         /* send a neighbour solicitation for our addr */
4016         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4017         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4018                       ifp->dad_nonce);
4019 out:
4020         in6_ifa_put(ifp);
4021         rtnl_unlock();
4022 }
4023
4024 /* ifp->idev must be at least read locked */
4025 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4026 {
4027         struct inet6_ifaddr *ifpiter;
4028         struct inet6_dev *idev = ifp->idev;
4029
4030         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4031                 if (ifpiter->scope > IFA_LINK)
4032                         break;
4033                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4034                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4035                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4036                     IFA_F_PERMANENT)
4037                         return false;
4038         }
4039         return true;
4040 }
4041
4042 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4043                                    bool send_na)
4044 {
4045         struct net_device *dev = ifp->idev->dev;
4046         struct in6_addr lladdr;
4047         bool send_rs, send_mld;
4048
4049         addrconf_del_dad_work(ifp);
4050
4051         /*
4052          *      Configure the address for reception. Now it is valid.
4053          */
4054
4055         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4056
4057         /* If added prefix is link local and we are prepared to process
4058            router advertisements, start sending router solicitations.
4059          */
4060
4061         read_lock_bh(&ifp->idev->lock);
4062         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4063         send_rs = send_mld &&
4064                   ipv6_accept_ra(ifp->idev) &&
4065                   ifp->idev->cnf.rtr_solicits != 0 &&
4066                   (dev->flags & IFF_LOOPBACK) == 0 &&
4067                   (dev->type != ARPHRD_TUNNEL);
4068         read_unlock_bh(&ifp->idev->lock);
4069
4070         /* While dad is in progress mld report's source address is in6_addrany.
4071          * Resend with proper ll now.
4072          */
4073         if (send_mld)
4074                 ipv6_mc_dad_complete(ifp->idev);
4075
4076         /* send unsolicited NA if enabled */
4077         if (send_na &&
4078             (ifp->idev->cnf.ndisc_notify ||
4079              dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4080                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4081                               /*router=*/ !!ifp->idev->cnf.forwarding,
4082                               /*solicited=*/ false, /*override=*/ true,
4083                               /*inc_opt=*/ true);
4084         }
4085
4086         if (send_rs) {
4087                 /*
4088                  *      If a host as already performed a random delay
4089                  *      [...] as part of DAD [...] there is no need
4090                  *      to delay again before sending the first RS
4091                  */
4092                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4093                         return;
4094                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4095
4096                 write_lock_bh(&ifp->idev->lock);
4097                 spin_lock(&ifp->lock);
4098                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4099                         ifp->idev->cnf.rtr_solicit_interval);
4100                 ifp->idev->rs_probes = 1;
4101                 ifp->idev->if_flags |= IF_RS_SENT;
4102                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4103                 spin_unlock(&ifp->lock);
4104                 write_unlock_bh(&ifp->idev->lock);
4105         }
4106
4107         if (bump_id)
4108                 rt_genid_bump_ipv6(dev_net(dev));
4109
4110         /* Make sure that a new temporary address will be created
4111          * before this temporary address becomes deprecated.
4112          */
4113         if (ifp->flags & IFA_F_TEMPORARY)
4114                 addrconf_verify_rtnl();
4115 }
4116
4117 static void addrconf_dad_run(struct inet6_dev *idev)
4118 {
4119         struct inet6_ifaddr *ifp;
4120
4121         read_lock_bh(&idev->lock);
4122         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4123                 spin_lock(&ifp->lock);
4124                 if (ifp->flags & IFA_F_TENTATIVE &&
4125                     ifp->state == INET6_IFADDR_STATE_DAD)
4126                         addrconf_dad_kick(ifp);
4127                 spin_unlock(&ifp->lock);
4128         }
4129         read_unlock_bh(&idev->lock);
4130 }
4131
4132 #ifdef CONFIG_PROC_FS
4133 struct if6_iter_state {
4134         struct seq_net_private p;
4135         int bucket;
4136         int offset;
4137 };
4138
4139 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4140 {
4141         struct inet6_ifaddr *ifa = NULL;
4142         struct if6_iter_state *state = seq->private;
4143         struct net *net = seq_file_net(seq);
4144         int p = 0;
4145
4146         /* initial bucket if pos is 0 */
4147         if (pos == 0) {
4148                 state->bucket = 0;
4149                 state->offset = 0;
4150         }
4151
4152         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4153                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4154                                          addr_lst) {
4155                         if (!net_eq(dev_net(ifa->idev->dev), net))
4156                                 continue;
4157                         /* sync with offset */
4158                         if (p < state->offset) {
4159                                 p++;
4160                                 continue;
4161                         }
4162                         return ifa;
4163                 }
4164
4165                 /* prepare for next bucket */
4166                 state->offset = 0;
4167                 p = 0;
4168         }
4169         return NULL;
4170 }
4171
4172 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4173                                          struct inet6_ifaddr *ifa)
4174 {
4175         struct if6_iter_state *state = seq->private;
4176         struct net *net = seq_file_net(seq);
4177
4178         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4179                 if (!net_eq(dev_net(ifa->idev->dev), net))
4180                         continue;
4181                 state->offset++;
4182                 return ifa;
4183         }
4184
4185         state->offset = 0;
4186         while (++state->bucket < IN6_ADDR_HSIZE) {
4187                 hlist_for_each_entry_rcu_bh(ifa,
4188                                      &inet6_addr_lst[state->bucket], addr_lst) {
4189                         if (!net_eq(dev_net(ifa->idev->dev), net))
4190                                 continue;
4191                         return ifa;
4192                 }
4193         }
4194
4195         return NULL;
4196 }
4197
4198 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4199         __acquires(rcu_bh)
4200 {
4201         rcu_read_lock_bh();
4202         return if6_get_first(seq, *pos);
4203 }
4204
4205 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4206 {
4207         struct inet6_ifaddr *ifa;
4208
4209         ifa = if6_get_next(seq, v);
4210         ++*pos;
4211         return ifa;
4212 }
4213
4214 static void if6_seq_stop(struct seq_file *seq, void *v)
4215         __releases(rcu_bh)
4216 {
4217         rcu_read_unlock_bh();
4218 }
4219
4220 static int if6_seq_show(struct seq_file *seq, void *v)
4221 {
4222         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4223         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4224                    &ifp->addr,
4225                    ifp->idev->dev->ifindex,
4226                    ifp->prefix_len,
4227                    ifp->scope,
4228                    (u8) ifp->flags,
4229                    ifp->idev->dev->name);
4230         return 0;
4231 }
4232
4233 static const struct seq_operations if6_seq_ops = {
4234         .start  = if6_seq_start,
4235         .next   = if6_seq_next,
4236         .show   = if6_seq_show,
4237         .stop   = if6_seq_stop,
4238 };
4239
4240 static int if6_seq_open(struct inode *inode, struct file *file)
4241 {
4242         return seq_open_net(inode, file, &if6_seq_ops,
4243                             sizeof(struct if6_iter_state));
4244 }
4245
4246 static const struct file_operations if6_fops = {
4247         .owner          = THIS_MODULE,
4248         .open           = if6_seq_open,
4249         .read           = seq_read,
4250         .llseek         = seq_lseek,
4251         .release        = seq_release_net,
4252 };
4253
4254 static int __net_init if6_proc_net_init(struct net *net)
4255 {
4256         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4257                 return -ENOMEM;
4258         return 0;
4259 }
4260
4261 static void __net_exit if6_proc_net_exit(struct net *net)
4262 {
4263         remove_proc_entry("if_inet6", net->proc_net);
4264 }
4265
4266 static struct pernet_operations if6_proc_net_ops = {
4267         .init = if6_proc_net_init,
4268         .exit = if6_proc_net_exit,
4269 };
4270
4271 int __init if6_proc_init(void)
4272 {
4273         return register_pernet_subsys(&if6_proc_net_ops);
4274 }
4275
4276 void if6_proc_exit(void)
4277 {
4278         unregister_pernet_subsys(&if6_proc_net_ops);
4279 }
4280 #endif  /* CONFIG_PROC_FS */
4281
4282 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4283 /* Check if address is a home address configured on any interface. */
4284 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4285 {
4286         int ret = 0;
4287         struct inet6_ifaddr *ifp = NULL;
4288         unsigned int hash = inet6_addr_hash(addr);
4289
4290         rcu_read_lock_bh();
4291         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4292                 if (!net_eq(dev_net(ifp->idev->dev), net))
4293                         continue;
4294                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4295                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4296                         ret = 1;
4297                         break;
4298                 }
4299         }
4300         rcu_read_unlock_bh();
4301         return ret;
4302 }
4303 #endif
4304
4305 /*
4306  *      Periodic address status verification
4307  */
4308
4309 static void addrconf_verify_rtnl(void)
4310 {
4311         unsigned long now, next, next_sec, next_sched;
4312         struct inet6_ifaddr *ifp;
4313         int i;
4314
4315         ASSERT_RTNL();
4316
4317         rcu_read_lock_bh();
4318         now = jiffies;
4319         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4320
4321         cancel_delayed_work(&addr_chk_work);
4322
4323         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4324 restart:
4325                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4326                         unsigned long age;
4327
4328                         /* When setting preferred_lft to a value not zero or
4329                          * infinity, while valid_lft is infinity
4330                          * IFA_F_PERMANENT has a non-infinity life time.
4331                          */
4332                         if ((ifp->flags & IFA_F_PERMANENT) &&
4333                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4334                                 continue;
4335
4336                         spin_lock(&ifp->lock);
4337                         /* We try to batch several events at once. */
4338                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4339
4340                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4341                             age >= ifp->valid_lft) {
4342                                 spin_unlock(&ifp->lock);
4343                                 in6_ifa_hold(ifp);
4344                                 ipv6_del_addr(ifp);
4345                                 goto restart;
4346                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4347                                 spin_unlock(&ifp->lock);
4348                                 continue;
4349                         } else if (age >= ifp->prefered_lft) {
4350                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4351                                 int deprecate = 0;
4352
4353                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4354                                         deprecate = 1;
4355                                         ifp->flags |= IFA_F_DEPRECATED;
4356                                 }
4357
4358                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4359                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4360                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4361
4362                                 spin_unlock(&ifp->lock);
4363
4364                                 if (deprecate) {
4365                                         in6_ifa_hold(ifp);
4366
4367                                         ipv6_ifa_notify(0, ifp);
4368                                         in6_ifa_put(ifp);
4369                                         goto restart;
4370                                 }
4371                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4372                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4373                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4374                                         ifp->idev->cnf.dad_transmits *
4375                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4376
4377                                 if (age >= ifp->prefered_lft - regen_advance) {
4378                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4379                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4380                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4381                                         if (!ifp->regen_count && ifpub) {
4382                                                 ifp->regen_count++;
4383                                                 in6_ifa_hold(ifp);
4384                                                 in6_ifa_hold(ifpub);
4385                                                 spin_unlock(&ifp->lock);
4386
4387                                                 spin_lock(&ifpub->lock);
4388                                                 ifpub->regen_count = 0;
4389                                                 spin_unlock(&ifpub->lock);
4390                                                 ipv6_create_tempaddr(ifpub, ifp);
4391                                                 in6_ifa_put(ifpub);
4392                                                 in6_ifa_put(ifp);
4393                                                 goto restart;
4394                                         }
4395                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4396                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4397                                 spin_unlock(&ifp->lock);
4398                         } else {
4399                                 /* ifp->prefered_lft <= ifp->valid_lft */
4400                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4401                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4402                                 spin_unlock(&ifp->lock);
4403                         }
4404                 }
4405         }
4406
4407         next_sec = round_jiffies_up(next);
4408         next_sched = next;
4409
4410         /* If rounded timeout is accurate enough, accept it. */
4411         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4412                 next_sched = next_sec;
4413
4414         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4415         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4416                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4417
4418         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4419               now, next, next_sec, next_sched);
4420         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4421         rcu_read_unlock_bh();
4422 }
4423
4424 static void addrconf_verify_work(struct work_struct *w)
4425 {
4426         rtnl_lock();
4427         addrconf_verify_rtnl();
4428         rtnl_unlock();
4429 }
4430
4431 static void addrconf_verify(void)
4432 {
4433         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4434 }
4435
4436 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4437                                      struct in6_addr **peer_pfx)
4438 {
4439         struct in6_addr *pfx = NULL;
4440
4441         *peer_pfx = NULL;
4442
4443         if (addr)
4444                 pfx = nla_data(addr);
4445
4446         if (local) {
4447                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4448                         *peer_pfx = pfx;
4449                 pfx = nla_data(local);
4450         }
4451
4452         return pfx;
4453 }
4454
4455 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4456         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4457         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4458         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4459         [IFA_FLAGS]             = { .len = sizeof(u32) },
4460 };
4461
4462 static int
4463 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4464                   struct netlink_ext_ack *extack)
4465 {
4466         struct net *net = sock_net(skb->sk);
4467         struct ifaddrmsg *ifm;
4468         struct nlattr *tb[IFA_MAX+1];
4469         struct in6_addr *pfx, *peer_pfx;
4470         u32 ifa_flags;
4471         int err;
4472
4473         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4474                           extack);
4475         if (err < 0)
4476                 return err;
4477
4478         ifm = nlmsg_data(nlh);
4479         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4480         if (!pfx)
4481                 return -EINVAL;
4482
4483         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4484
4485         /* We ignore other flags so far. */
4486         ifa_flags &= IFA_F_MANAGETEMPADDR;
4487
4488         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4489                               ifm->ifa_prefixlen);
4490 }
4491
4492 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4493                              u32 prefered_lft, u32 valid_lft)
4494 {
4495         u32 flags;
4496         clock_t expires;
4497         unsigned long timeout;
4498         bool was_managetempaddr;
4499         bool had_prefixroute;
4500
4501         ASSERT_RTNL();
4502
4503         if (!valid_lft || (prefered_lft > valid_lft))
4504                 return -EINVAL;
4505
4506         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4507             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4508                 return -EINVAL;
4509
4510         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4511         if (addrconf_finite_timeout(timeout)) {
4512                 expires = jiffies_to_clock_t(timeout * HZ);
4513                 valid_lft = timeout;
4514                 flags = RTF_EXPIRES;
4515         } else {
4516                 expires = 0;
4517                 flags = 0;
4518                 ifa_flags |= IFA_F_PERMANENT;
4519         }
4520
4521         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4522         if (addrconf_finite_timeout(timeout)) {
4523                 if (timeout == 0)
4524                         ifa_flags |= IFA_F_DEPRECATED;
4525                 prefered_lft = timeout;
4526         }
4527
4528         spin_lock_bh(&ifp->lock);
4529         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4530         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4531                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4532         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4533                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4534                         IFA_F_NOPREFIXROUTE);
4535         ifp->flags |= ifa_flags;
4536         ifp->tstamp = jiffies;
4537         ifp->valid_lft = valid_lft;
4538         ifp->prefered_lft = prefered_lft;
4539
4540         spin_unlock_bh(&ifp->lock);
4541         if (!(ifp->flags&IFA_F_TENTATIVE))
4542                 ipv6_ifa_notify(0, ifp);
4543
4544         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4545                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4546                                       expires, flags);
4547         } else if (had_prefixroute) {
4548                 enum cleanup_prefix_rt_t action;
4549                 unsigned long rt_expires;
4550
4551                 write_lock_bh(&ifp->idev->lock);
4552                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4553                 write_unlock_bh(&ifp->idev->lock);
4554
4555                 if (action != CLEANUP_PREFIX_RT_NOP) {
4556                         cleanup_prefix_route(ifp, rt_expires,
4557                                 action == CLEANUP_PREFIX_RT_DEL);
4558                 }
4559         }
4560
4561         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4562                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4563                         valid_lft = prefered_lft = 0;
4564                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4565                                  !was_managetempaddr, jiffies);
4566         }
4567
4568         addrconf_verify_rtnl();
4569
4570         return 0;
4571 }
4572
4573 static int
4574 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4575                   struct netlink_ext_ack *extack)
4576 {
4577         struct net *net = sock_net(skb->sk);
4578         struct ifaddrmsg *ifm;
4579         struct nlattr *tb[IFA_MAX+1];
4580         struct in6_addr *pfx, *peer_pfx;
4581         struct inet6_ifaddr *ifa;
4582         struct net_device *dev;
4583         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4584         u32 ifa_flags;
4585         int err;
4586
4587         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4588                           extack);
4589         if (err < 0)
4590                 return err;
4591
4592         ifm = nlmsg_data(nlh);
4593         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4594         if (!pfx)
4595                 return -EINVAL;
4596
4597         if (tb[IFA_CACHEINFO]) {
4598                 struct ifa_cacheinfo *ci;
4599
4600                 ci = nla_data(tb[IFA_CACHEINFO]);
4601                 valid_lft = ci->ifa_valid;
4602                 preferred_lft = ci->ifa_prefered;
4603         } else {
4604                 preferred_lft = INFINITY_LIFE_TIME;
4605                 valid_lft = INFINITY_LIFE_TIME;
4606         }
4607
4608         dev =  __dev_get_by_index(net, ifm->ifa_index);
4609         if (!dev)
4610                 return -ENODEV;
4611
4612         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4613
4614         /* We ignore other flags so far. */
4615         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4616                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4617
4618         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4619         if (!ifa) {
4620                 /*
4621                  * It would be best to check for !NLM_F_CREATE here but
4622                  * userspace already relies on not having to provide this.
4623                  */
4624                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4625                                       ifm->ifa_prefixlen, ifa_flags,
4626                                       preferred_lft, valid_lft);
4627         }
4628
4629         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4630             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4631                 err = -EEXIST;
4632         else
4633                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4634
4635         in6_ifa_put(ifa);
4636
4637         return err;
4638 }
4639
4640 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4641                           u8 scope, int ifindex)
4642 {
4643         struct ifaddrmsg *ifm;
4644
4645         ifm = nlmsg_data(nlh);
4646         ifm->ifa_family = AF_INET6;
4647         ifm->ifa_prefixlen = prefixlen;
4648         ifm->ifa_flags = flags;
4649         ifm->ifa_scope = scope;
4650         ifm->ifa_index = ifindex;
4651 }
4652
4653 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4654                          unsigned long tstamp, u32 preferred, u32 valid)
4655 {
4656         struct ifa_cacheinfo ci;
4657
4658         ci.cstamp = cstamp_delta(cstamp);
4659         ci.tstamp = cstamp_delta(tstamp);
4660         ci.ifa_prefered = preferred;
4661         ci.ifa_valid = valid;
4662
4663         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4664 }
4665
4666 static inline int rt_scope(int ifa_scope)
4667 {
4668         if (ifa_scope & IFA_HOST)
4669                 return RT_SCOPE_HOST;
4670         else if (ifa_scope & IFA_LINK)
4671                 return RT_SCOPE_LINK;
4672         else if (ifa_scope & IFA_SITE)
4673                 return RT_SCOPE_SITE;
4674         else
4675                 return RT_SCOPE_UNIVERSE;
4676 }
4677
4678 static inline int inet6_ifaddr_msgsize(void)
4679 {
4680         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4681                + nla_total_size(16) /* IFA_LOCAL */
4682                + nla_total_size(16) /* IFA_ADDRESS */
4683                + nla_total_size(sizeof(struct ifa_cacheinfo))
4684                + nla_total_size(4)  /* IFA_FLAGS */;
4685 }
4686
4687 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4688                              u32 portid, u32 seq, int event, unsigned int flags)
4689 {
4690         struct nlmsghdr  *nlh;
4691         u32 preferred, valid;
4692
4693         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4694         if (!nlh)
4695                 return -EMSGSIZE;
4696
4697         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4698                       ifa->idev->dev->ifindex);
4699
4700         if (!((ifa->flags&IFA_F_PERMANENT) &&
4701               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4702                 preferred = ifa->prefered_lft;
4703                 valid = ifa->valid_lft;
4704                 if (preferred != INFINITY_LIFE_TIME) {
4705                         long tval = (jiffies - ifa->tstamp)/HZ;
4706                         if (preferred > tval)
4707                                 preferred -= tval;
4708                         else
4709                                 preferred = 0;
4710                         if (valid != INFINITY_LIFE_TIME) {
4711                                 if (valid > tval)
4712                                         valid -= tval;
4713                                 else
4714                                         valid = 0;
4715                         }
4716                 }
4717         } else {
4718                 preferred = INFINITY_LIFE_TIME;
4719                 valid = INFINITY_LIFE_TIME;
4720         }
4721
4722         if (!ipv6_addr_any(&ifa->peer_addr)) {
4723                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4724                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4725                         goto error;
4726         } else
4727                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4728                         goto error;
4729
4730         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4731                 goto error;
4732
4733         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4734                 goto error;
4735
4736         nlmsg_end(skb, nlh);
4737         return 0;
4738
4739 error:
4740         nlmsg_cancel(skb, nlh);
4741         return -EMSGSIZE;
4742 }
4743
4744 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4745                                 u32 portid, u32 seq, int event, u16 flags)
4746 {
4747         struct nlmsghdr  *nlh;
4748         u8 scope = RT_SCOPE_UNIVERSE;
4749         int ifindex = ifmca->idev->dev->ifindex;
4750
4751         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4752                 scope = RT_SCOPE_SITE;
4753
4754         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4755         if (!nlh)
4756                 return -EMSGSIZE;
4757
4758         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4759         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4760             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4761                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4762                 nlmsg_cancel(skb, nlh);
4763                 return -EMSGSIZE;
4764         }
4765
4766         nlmsg_end(skb, nlh);
4767         return 0;
4768 }
4769
4770 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4771                                 u32 portid, u32 seq, int event, unsigned int flags)
4772 {
4773         struct nlmsghdr  *nlh;
4774         u8 scope = RT_SCOPE_UNIVERSE;
4775         int ifindex = ifaca->aca_idev->dev->ifindex;
4776
4777         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4778                 scope = RT_SCOPE_SITE;
4779
4780         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4781         if (!nlh)
4782                 return -EMSGSIZE;
4783
4784         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4785         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4786             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4787                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4788                 nlmsg_cancel(skb, nlh);
4789                 return -EMSGSIZE;
4790         }
4791
4792         nlmsg_end(skb, nlh);
4793         return 0;
4794 }
4795
4796 enum addr_type_t {
4797         UNICAST_ADDR,
4798         MULTICAST_ADDR,
4799         ANYCAST_ADDR,
4800 };
4801
4802 /* called with rcu_read_lock() */
4803 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4804                           struct netlink_callback *cb, enum addr_type_t type,
4805                           int s_ip_idx, int *p_ip_idx)
4806 {
4807         struct ifmcaddr6 *ifmca;
4808         struct ifacaddr6 *ifaca;
4809         int err = 1;
4810         int ip_idx = *p_ip_idx;
4811
4812         read_lock_bh(&idev->lock);
4813         switch (type) {
4814         case UNICAST_ADDR: {
4815                 struct inet6_ifaddr *ifa;
4816
4817                 /* unicast address incl. temp addr */
4818                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4819                         if (ip_idx < s_ip_idx)
4820                                 goto next;
4821                         err = inet6_fill_ifaddr(skb, ifa,
4822                                                 NETLINK_CB(cb->skb).portid,
4823                                                 cb->nlh->nlmsg_seq,
4824                                                 RTM_NEWADDR,
4825                                                 NLM_F_MULTI);
4826                         if (err < 0)
4827                                 break;
4828                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4829 next:
4830                         ip_idx++;
4831                 }
4832                 break;
4833         }
4834         case MULTICAST_ADDR:
4835                 /* multicast address */
4836                 for (ifmca = idev->mc_list; ifmca;
4837                      ifmca = ifmca->next, ip_idx++) {
4838                         if (ip_idx < s_ip_idx)
4839                                 continue;
4840                         err = inet6_fill_ifmcaddr(skb, ifmca,
4841                                                   NETLINK_CB(cb->skb).portid,
4842                                                   cb->nlh->nlmsg_seq,
4843                                                   RTM_GETMULTICAST,
4844                                                   NLM_F_MULTI);
4845                         if (err < 0)
4846                                 break;
4847                 }
4848                 break;
4849         case ANYCAST_ADDR:
4850                 /* anycast address */
4851                 for (ifaca = idev->ac_list; ifaca;
4852                      ifaca = ifaca->aca_next, ip_idx++) {
4853                         if (ip_idx < s_ip_idx)
4854                                 continue;
4855                         err = inet6_fill_ifacaddr(skb, ifaca,
4856                                                   NETLINK_CB(cb->skb).portid,
4857                                                   cb->nlh->nlmsg_seq,
4858                                                   RTM_GETANYCAST,
4859                                                   NLM_F_MULTI);
4860                         if (err < 0)
4861                                 break;
4862                 }
4863                 break;
4864         default:
4865                 break;
4866         }
4867         read_unlock_bh(&idev->lock);
4868         *p_ip_idx = ip_idx;
4869         return err;
4870 }
4871
4872 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4873                            enum addr_type_t type)
4874 {
4875         struct net *net = sock_net(skb->sk);
4876         int h, s_h;
4877         int idx, ip_idx;
4878         int s_idx, s_ip_idx;
4879         struct net_device *dev;
4880         struct inet6_dev *idev;
4881         struct hlist_head *head;
4882
4883         s_h = cb->args[0];
4884         s_idx = idx = cb->args[1];
4885         s_ip_idx = ip_idx = cb->args[2];
4886
4887         rcu_read_lock();
4888         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4889         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4890                 idx = 0;
4891                 head = &net->dev_index_head[h];
4892                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4893                         if (idx < s_idx)
4894                                 goto cont;
4895                         if (h > s_h || idx > s_idx)
4896                                 s_ip_idx = 0;
4897                         ip_idx = 0;
4898                         idev = __in6_dev_get(dev);
4899                         if (!idev)
4900                                 goto cont;
4901
4902                         if (in6_dump_addrs(idev, skb, cb, type,
4903                                            s_ip_idx, &ip_idx) < 0)
4904                                 goto done;
4905 cont:
4906                         idx++;
4907                 }
4908         }
4909 done:
4910         rcu_read_unlock();
4911         cb->args[0] = h;
4912         cb->args[1] = idx;
4913         cb->args[2] = ip_idx;
4914
4915         return skb->len;
4916 }
4917
4918 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4919 {
4920         enum addr_type_t type = UNICAST_ADDR;
4921
4922         return inet6_dump_addr(skb, cb, type);
4923 }
4924
4925 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4926 {
4927         enum addr_type_t type = MULTICAST_ADDR;
4928
4929         return inet6_dump_addr(skb, cb, type);
4930 }
4931
4932
4933 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4934 {
4935         enum addr_type_t type = ANYCAST_ADDR;
4936
4937         return inet6_dump_addr(skb, cb, type);
4938 }
4939
4940 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4941                              struct netlink_ext_ack *extack)
4942 {
4943         struct net *net = sock_net(in_skb->sk);
4944         struct ifaddrmsg *ifm;
4945         struct nlattr *tb[IFA_MAX+1];
4946         struct in6_addr *addr = NULL, *peer;
4947         struct net_device *dev = NULL;
4948         struct inet6_ifaddr *ifa;
4949         struct sk_buff *skb;
4950         int err;
4951
4952         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4953                           extack);
4954         if (err < 0)
4955                 goto errout;
4956
4957         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4958         if (!addr) {
4959                 err = -EINVAL;
4960                 goto errout;
4961         }
4962
4963         ifm = nlmsg_data(nlh);
4964         if (ifm->ifa_index)
4965                 dev = __dev_get_by_index(net, ifm->ifa_index);
4966
4967         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4968         if (!ifa) {
4969                 err = -EADDRNOTAVAIL;
4970                 goto errout;
4971         }
4972
4973         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4974         if (!skb) {
4975                 err = -ENOBUFS;
4976                 goto errout_ifa;
4977         }
4978
4979         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4980                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4981         if (err < 0) {
4982                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4983                 WARN_ON(err == -EMSGSIZE);
4984                 kfree_skb(skb);
4985                 goto errout_ifa;
4986         }
4987         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4988 errout_ifa:
4989         in6_ifa_put(ifa);
4990 errout:
4991         return err;
4992 }
4993
4994 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4995 {
4996         struct sk_buff *skb;
4997         struct net *net = dev_net(ifa->idev->dev);
4998         int err = -ENOBUFS;
4999
5000         /* Don't send DELADDR notification for TENTATIVE address,
5001          * since NEWADDR notification is sent only after removing
5002          * TENTATIVE flag, if DAD has not failed.
5003          */
5004         if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
5005             event == RTM_DELADDR)
5006                 return;
5007
5008         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5009         if (!skb)
5010                 goto errout;
5011
5012         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
5013         if (err < 0) {
5014                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5015                 WARN_ON(err == -EMSGSIZE);
5016                 kfree_skb(skb);
5017                 goto errout;
5018         }
5019         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5020         return;
5021 errout:
5022         if (err < 0)
5023                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5024 }
5025
5026 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5027                                 __s32 *array, int bytes)
5028 {
5029         BUG_ON(bytes < (DEVCONF_MAX * 4));
5030
5031         memset(array, 0, bytes);
5032         array[DEVCONF_FORWARDING] = cnf->forwarding;
5033         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5034         array[DEVCONF_MTU6] = cnf->mtu6;
5035         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5036         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5037         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5038         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5039         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5040         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5041                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5042         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5043                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5044         array[DEVCONF_RTR_SOLICIT_DELAY] =
5045                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5046         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5047         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5048                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5049         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5050                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5051         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5052         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5053         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5054         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5055         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5056         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5057         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5058         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5059         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5060 #ifdef CONFIG_IPV6_ROUTER_PREF
5061         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5062         array[DEVCONF_RTR_PROBE_INTERVAL] =
5063                 jiffies_to_msecs(cnf->rtr_probe_interval);
5064 #ifdef CONFIG_IPV6_ROUTE_INFO
5065         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5066         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5067 #endif
5068 #endif
5069         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5070         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5071 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5072         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5073         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5074 #endif
5075 #ifdef CONFIG_IPV6_MROUTE
5076         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5077 #endif
5078         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5079         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5080         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5081         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5082         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5083         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5084         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5085         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5086         /* we omit DEVCONF_STABLE_SECRET for now */
5087         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5088         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5089         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5090         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5091         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5092 #ifdef CONFIG_IPV6_SEG6_HMAC
5093         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5094 #endif
5095         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5096         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5097         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5098 }
5099
5100 static inline size_t inet6_ifla6_size(void)
5101 {
5102         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5103              + nla_total_size(sizeof(struct ifla_cacheinfo))
5104              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5105              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5106              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5107              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5108 }
5109
5110 static inline size_t inet6_if_nlmsg_size(void)
5111 {
5112         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5113                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5114                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5115                + nla_total_size(4) /* IFLA_MTU */
5116                + nla_total_size(4) /* IFLA_LINK */
5117                + nla_total_size(1) /* IFLA_OPERSTATE */
5118                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5119 }
5120
5121 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5122                                         int bytes)
5123 {
5124         int i;
5125         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5126         BUG_ON(pad < 0);
5127
5128         /* Use put_unaligned() because stats may not be aligned for u64. */
5129         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5130         for (i = 1; i < ICMP6_MIB_MAX; i++)
5131                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5132
5133         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5134 }
5135
5136 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5137                                         int bytes, size_t syncpoff)
5138 {
5139         int i, c;
5140         u64 buff[IPSTATS_MIB_MAX];
5141         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5142
5143         BUG_ON(pad < 0);
5144
5145         memset(buff, 0, sizeof(buff));
5146         buff[0] = IPSTATS_MIB_MAX;
5147
5148         for_each_possible_cpu(c) {
5149                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5150                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5151         }
5152
5153         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5154         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5155 }
5156
5157 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5158                              int bytes)
5159 {
5160         switch (attrtype) {
5161         case IFLA_INET6_STATS:
5162                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5163                                      offsetof(struct ipstats_mib, syncp));
5164                 break;
5165         case IFLA_INET6_ICMP6STATS:
5166                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5167                 break;
5168         }
5169 }
5170
5171 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5172                                   u32 ext_filter_mask)
5173 {
5174         struct nlattr *nla;
5175         struct ifla_cacheinfo ci;
5176
5177         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5178                 goto nla_put_failure;
5179         ci.max_reasm_len = IPV6_MAXPLEN;
5180         ci.tstamp = cstamp_delta(idev->tstamp);
5181         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5182         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5183         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5184                 goto nla_put_failure;
5185         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5186         if (!nla)
5187                 goto nla_put_failure;
5188         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5189
5190         /* XXX - MC not implemented */
5191
5192         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5193                 return 0;
5194
5195         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5196         if (!nla)
5197                 goto nla_put_failure;
5198         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5199
5200         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5201         if (!nla)
5202                 goto nla_put_failure;
5203         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5204
5205         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5206         if (!nla)
5207                 goto nla_put_failure;
5208
5209         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5210                 goto nla_put_failure;
5211
5212         read_lock_bh(&idev->lock);
5213         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5214         read_unlock_bh(&idev->lock);
5215
5216         return 0;
5217
5218 nla_put_failure:
5219         return -EMSGSIZE;
5220 }
5221
5222 static size_t inet6_get_link_af_size(const struct net_device *dev,
5223                                      u32 ext_filter_mask)
5224 {
5225         if (!__in6_dev_get(dev))
5226                 return 0;
5227
5228         return inet6_ifla6_size();
5229 }
5230
5231 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5232                               u32 ext_filter_mask)
5233 {
5234         struct inet6_dev *idev = __in6_dev_get(dev);
5235
5236         if (!idev)
5237                 return -ENODATA;
5238
5239         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5240                 return -EMSGSIZE;
5241
5242         return 0;
5243 }
5244
5245 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5246 {
5247         struct inet6_ifaddr *ifp;
5248         struct net_device *dev = idev->dev;
5249         bool clear_token, update_rs = false;
5250         struct in6_addr ll_addr;
5251
5252         ASSERT_RTNL();
5253
5254         if (!token)
5255                 return -EINVAL;
5256         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5257                 return -EINVAL;
5258         if (!ipv6_accept_ra(idev))
5259                 return -EINVAL;
5260         if (idev->cnf.rtr_solicits == 0)
5261                 return -EINVAL;
5262
5263         write_lock_bh(&idev->lock);
5264
5265         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5266         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5267
5268         write_unlock_bh(&idev->lock);
5269
5270         clear_token = ipv6_addr_any(token);
5271         if (clear_token)
5272                 goto update_lft;
5273
5274         if (!idev->dead && (idev->if_flags & IF_READY) &&
5275             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5276                              IFA_F_OPTIMISTIC)) {
5277                 /* If we're not ready, then normal ifup will take care
5278                  * of this. Otherwise, we need to request our rs here.
5279                  */
5280                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5281                 update_rs = true;
5282         }
5283
5284 update_lft:
5285         write_lock_bh(&idev->lock);
5286
5287         if (update_rs) {
5288                 idev->if_flags |= IF_RS_SENT;
5289                 idev->rs_interval = rfc3315_s14_backoff_init(
5290                         idev->cnf.rtr_solicit_interval);
5291                 idev->rs_probes = 1;
5292                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5293         }
5294
5295         /* Well, that's kinda nasty ... */
5296         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5297                 spin_lock(&ifp->lock);
5298                 if (ifp->tokenized) {
5299                         ifp->valid_lft = 0;
5300                         ifp->prefered_lft = 0;
5301                 }
5302                 spin_unlock(&ifp->lock);
5303         }
5304
5305         write_unlock_bh(&idev->lock);
5306         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5307         addrconf_verify_rtnl();
5308         return 0;
5309 }
5310
5311 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5312         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5313         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5314 };
5315
5316 static int inet6_validate_link_af(const struct net_device *dev,
5317                                   const struct nlattr *nla)
5318 {
5319         struct nlattr *tb[IFLA_INET6_MAX + 1];
5320
5321         if (dev && !__in6_dev_get(dev))
5322                 return -EAFNOSUPPORT;
5323
5324         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5325                                 NULL);
5326 }
5327
5328 static int check_addr_gen_mode(int mode)
5329 {
5330         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5331             mode != IN6_ADDR_GEN_MODE_NONE &&
5332             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5333             mode != IN6_ADDR_GEN_MODE_RANDOM)
5334                 return -EINVAL;
5335         return 1;
5336 }
5337
5338 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5339                                 int mode)
5340 {
5341         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5342             !idev->cnf.stable_secret.initialized &&
5343             !net->ipv6.devconf_dflt->stable_secret.initialized)
5344                 return -EINVAL;
5345         return 1;
5346 }
5347
5348 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5349 {
5350         int err = -EINVAL;
5351         struct inet6_dev *idev = __in6_dev_get(dev);
5352         struct nlattr *tb[IFLA_INET6_MAX + 1];
5353
5354         if (!idev)
5355                 return -EAFNOSUPPORT;
5356
5357         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5358                 BUG();
5359
5360         if (tb[IFLA_INET6_TOKEN]) {
5361                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5362                 if (err)
5363                         return err;
5364         }
5365
5366         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5367                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5368
5369                 if (check_addr_gen_mode(mode) < 0 ||
5370                     check_stable_privacy(idev, dev_net(dev), mode) < 0)
5371                         return -EINVAL;
5372
5373                 idev->cnf.addr_gen_mode = mode;
5374                 err = 0;
5375         }
5376
5377         return err;
5378 }
5379
5380 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5381                              u32 portid, u32 seq, int event, unsigned int flags)
5382 {
5383         struct net_device *dev = idev->dev;
5384         struct ifinfomsg *hdr;
5385         struct nlmsghdr *nlh;
5386         void *protoinfo;
5387
5388         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5389         if (!nlh)
5390                 return -EMSGSIZE;
5391
5392         hdr = nlmsg_data(nlh);
5393         hdr->ifi_family = AF_INET6;
5394         hdr->__ifi_pad = 0;
5395         hdr->ifi_type = dev->type;
5396         hdr->ifi_index = dev->ifindex;
5397         hdr->ifi_flags = dev_get_flags(dev);
5398         hdr->ifi_change = 0;
5399
5400         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5401             (dev->addr_len &&
5402              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5403             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5404             (dev->ifindex != dev_get_iflink(dev) &&
5405              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5406             nla_put_u8(skb, IFLA_OPERSTATE,
5407                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5408                 goto nla_put_failure;
5409         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5410         if (!protoinfo)
5411                 goto nla_put_failure;
5412
5413         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5414                 goto nla_put_failure;
5415
5416         nla_nest_end(skb, protoinfo);
5417         nlmsg_end(skb, nlh);
5418         return 0;
5419
5420 nla_put_failure:
5421         nlmsg_cancel(skb, nlh);
5422         return -EMSGSIZE;
5423 }
5424
5425 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5426 {
5427         struct net *net = sock_net(skb->sk);
5428         int h, s_h;
5429         int idx = 0, s_idx;
5430         struct net_device *dev;
5431         struct inet6_dev *idev;
5432         struct hlist_head *head;
5433
5434         s_h = cb->args[0];
5435         s_idx = cb->args[1];
5436
5437         rcu_read_lock();
5438         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5439                 idx = 0;
5440                 head = &net->dev_index_head[h];
5441                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5442                         if (idx < s_idx)
5443                                 goto cont;
5444                         idev = __in6_dev_get(dev);
5445                         if (!idev)
5446                                 goto cont;
5447                         if (inet6_fill_ifinfo(skb, idev,
5448                                               NETLINK_CB(cb->skb).portid,
5449                                               cb->nlh->nlmsg_seq,
5450                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5451                                 goto out;
5452 cont:
5453                         idx++;
5454                 }
5455         }
5456 out:
5457         rcu_read_unlock();
5458         cb->args[1] = idx;
5459         cb->args[0] = h;
5460
5461         return skb->len;
5462 }
5463
5464 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5465 {
5466         struct sk_buff *skb;
5467         struct net *net = dev_net(idev->dev);
5468         int err = -ENOBUFS;
5469
5470         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5471         if (!skb)
5472                 goto errout;
5473
5474         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5475         if (err < 0) {
5476                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5477                 WARN_ON(err == -EMSGSIZE);
5478                 kfree_skb(skb);
5479                 goto errout;
5480         }
5481         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5482         return;
5483 errout:
5484         if (err < 0)
5485                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5486 }
5487
5488 static inline size_t inet6_prefix_nlmsg_size(void)
5489 {
5490         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5491                + nla_total_size(sizeof(struct in6_addr))
5492                + nla_total_size(sizeof(struct prefix_cacheinfo));
5493 }
5494
5495 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5496                              struct prefix_info *pinfo, u32 portid, u32 seq,
5497                              int event, unsigned int flags)
5498 {
5499         struct prefixmsg *pmsg;
5500         struct nlmsghdr *nlh;
5501         struct prefix_cacheinfo ci;
5502
5503         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5504         if (!nlh)
5505                 return -EMSGSIZE;
5506
5507         pmsg = nlmsg_data(nlh);
5508         pmsg->prefix_family = AF_INET6;
5509         pmsg->prefix_pad1 = 0;
5510         pmsg->prefix_pad2 = 0;
5511         pmsg->prefix_ifindex = idev->dev->ifindex;
5512         pmsg->prefix_len = pinfo->prefix_len;
5513         pmsg->prefix_type = pinfo->type;
5514         pmsg->prefix_pad3 = 0;
5515         pmsg->prefix_flags = 0;
5516         if (pinfo->onlink)
5517                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5518         if (pinfo->autoconf)
5519                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5520
5521         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5522                 goto nla_put_failure;
5523         ci.preferred_time = ntohl(pinfo->prefered);
5524         ci.valid_time = ntohl(pinfo->valid);
5525         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5526                 goto nla_put_failure;
5527         nlmsg_end(skb, nlh);
5528         return 0;
5529
5530 nla_put_failure:
5531         nlmsg_cancel(skb, nlh);
5532         return -EMSGSIZE;
5533 }
5534
5535 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5536                          struct prefix_info *pinfo)
5537 {
5538         struct sk_buff *skb;
5539         struct net *net = dev_net(idev->dev);
5540         int err = -ENOBUFS;
5541
5542         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5543         if (!skb)
5544                 goto errout;
5545
5546         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5547         if (err < 0) {
5548                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5549                 WARN_ON(err == -EMSGSIZE);
5550                 kfree_skb(skb);
5551                 goto errout;
5552         }
5553         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5554         return;
5555 errout:
5556         if (err < 0)
5557                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5558 }
5559
5560 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5561 {
5562         struct net *net = dev_net(ifp->idev->dev);
5563
5564         if (event)
5565                 ASSERT_RTNL();
5566
5567         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5568
5569         switch (event) {
5570         case RTM_NEWADDR:
5571                 /*
5572                  * If the address was optimistic we inserted the route at the
5573                  * start of our DAD process, so we don't need to do it again.
5574                  * If the device was taken down in the middle of the DAD
5575                  * cycle there is a race where we could get here without a
5576                  * host route, so nothing to insert. That will be fixed when
5577                  * the device is brought up.
5578                  */
5579                 if (ifp->rt && !rcu_access_pointer(ifp->rt->rt6i_node)) {
5580                         ip6_ins_rt(ifp->rt);
5581                 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
5582                         pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
5583                                 &ifp->addr, ifp->idev->dev->name);
5584                 }
5585
5586                 if (ifp->idev->cnf.forwarding)
5587                         addrconf_join_anycast(ifp);
5588                 if (!ipv6_addr_any(&ifp->peer_addr))
5589                         addrconf_prefix_route(&ifp->peer_addr, 128,
5590                                               ifp->idev->dev, 0, 0);
5591                 break;
5592         case RTM_DELADDR:
5593                 if (ifp->idev->cnf.forwarding)
5594                         addrconf_leave_anycast(ifp);
5595                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5596                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5597                         struct rt6_info *rt;
5598
5599                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5600                                                        ifp->idev->dev, 0, 0);
5601                         if (rt)
5602                                 ip6_del_rt(rt);
5603                 }
5604                 if (ifp->rt) {
5605                         if (dst_hold_safe(&ifp->rt->dst))
5606                                 ip6_del_rt(ifp->rt);
5607                 }
5608                 rt_genid_bump_ipv6(net);
5609                 break;
5610         }
5611         atomic_inc(&net->ipv6.dev_addr_genid);
5612 }
5613
5614 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5615 {
5616         rcu_read_lock_bh();
5617         if (likely(ifp->idev->dead == 0))
5618                 __ipv6_ifa_notify(event, ifp);
5619         rcu_read_unlock_bh();
5620 }
5621
5622 #ifdef CONFIG_SYSCTL
5623
5624 static
5625 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5626                            void __user *buffer, size_t *lenp, loff_t *ppos)
5627 {
5628         int *valp = ctl->data;
5629         int val = *valp;
5630         loff_t pos = *ppos;
5631         struct ctl_table lctl;
5632         int ret;
5633
5634         /*
5635          * ctl->data points to idev->cnf.forwarding, we should
5636          * not modify it until we get the rtnl lock.
5637          */
5638         lctl = *ctl;
5639         lctl.data = &val;
5640
5641         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5642
5643         if (write)
5644                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5645         if (ret)
5646                 *ppos = pos;
5647         return ret;
5648 }
5649
5650 static
5651 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5652                         void __user *buffer, size_t *lenp, loff_t *ppos)
5653 {
5654         struct inet6_dev *idev = ctl->extra1;
5655         int min_mtu = IPV6_MIN_MTU;
5656         struct ctl_table lctl;
5657
5658         lctl = *ctl;
5659         lctl.extra1 = &min_mtu;
5660         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5661
5662         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5663 }
5664
5665 static void dev_disable_change(struct inet6_dev *idev)
5666 {
5667         struct netdev_notifier_info info;
5668
5669         if (!idev || !idev->dev)
5670                 return;
5671
5672         netdev_notifier_info_init(&info, idev->dev);
5673         if (idev->cnf.disable_ipv6)
5674                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5675         else
5676                 addrconf_notify(NULL, NETDEV_UP, &info);
5677 }
5678
5679 static void addrconf_disable_change(struct net *net, __s32 newf)
5680 {
5681         struct net_device *dev;
5682         struct inet6_dev *idev;
5683
5684         for_each_netdev(net, dev) {
5685                 idev = __in6_dev_get(dev);
5686                 if (idev) {
5687                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5688                         idev->cnf.disable_ipv6 = newf;
5689                         if (changed)
5690                                 dev_disable_change(idev);
5691                 }
5692         }
5693 }
5694
5695 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5696 {
5697         struct net *net;
5698         int old;
5699
5700         if (!rtnl_trylock())
5701                 return restart_syscall();
5702
5703         net = (struct net *)table->extra2;
5704         old = *p;
5705         *p = newf;
5706
5707         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5708                 rtnl_unlock();
5709                 return 0;
5710         }
5711
5712         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5713                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5714                 addrconf_disable_change(net, newf);
5715         } else if ((!newf) ^ (!old))
5716                 dev_disable_change((struct inet6_dev *)table->extra1);
5717
5718         rtnl_unlock();
5719         return 0;
5720 }
5721
5722 static
5723 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5724                             void __user *buffer, size_t *lenp, loff_t *ppos)
5725 {
5726         int *valp = ctl->data;
5727         int val = *valp;
5728         loff_t pos = *ppos;
5729         struct ctl_table lctl;
5730         int ret;
5731
5732         /*
5733          * ctl->data points to idev->cnf.disable_ipv6, we should
5734          * not modify it until we get the rtnl lock.
5735          */
5736         lctl = *ctl;
5737         lctl.data = &val;
5738
5739         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5740
5741         if (write)
5742                 ret = addrconf_disable_ipv6(ctl, valp, val);
5743         if (ret)
5744                 *ppos = pos;
5745         return ret;
5746 }
5747
5748 static
5749 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5750                               void __user *buffer, size_t *lenp, loff_t *ppos)
5751 {
5752         int *valp = ctl->data;
5753         int ret;
5754         int old, new;
5755
5756         old = *valp;
5757         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5758         new = *valp;
5759
5760         if (write && old != new) {
5761                 struct net *net = ctl->extra2;
5762
5763                 if (!rtnl_trylock())
5764                         return restart_syscall();
5765
5766                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5767                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5768                                                      NETCONFA_PROXY_NEIGH,
5769                                                      NETCONFA_IFINDEX_DEFAULT,
5770                                                      net->ipv6.devconf_dflt);
5771                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5772                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5773                                                      NETCONFA_PROXY_NEIGH,
5774                                                      NETCONFA_IFINDEX_ALL,
5775                                                      net->ipv6.devconf_all);
5776                 else {
5777                         struct inet6_dev *idev = ctl->extra1;
5778
5779                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5780                                                      NETCONFA_PROXY_NEIGH,
5781                                                      idev->dev->ifindex,
5782                                                      &idev->cnf);
5783                 }
5784                 rtnl_unlock();
5785         }
5786
5787         return ret;
5788 }
5789
5790 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5791                                          void __user *buffer, size_t *lenp,
5792                                          loff_t *ppos)
5793 {
5794         int ret = 0;
5795         int new_val;
5796         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5797         struct net *net = (struct net *)ctl->extra2;
5798
5799         if (!rtnl_trylock())
5800                 return restart_syscall();
5801
5802         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5803
5804         if (write) {
5805                 new_val = *((int *)ctl->data);
5806
5807                 if (check_addr_gen_mode(new_val) < 0) {
5808                         ret = -EINVAL;
5809                         goto out;
5810                 }
5811
5812                 /* request for default */
5813                 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5814                         ipv6_devconf_dflt.addr_gen_mode = new_val;
5815
5816                 /* request for individual net device */
5817                 } else {
5818                         if (!idev)
5819                                 goto out;
5820
5821                         if (check_stable_privacy(idev, net, new_val) < 0) {
5822                                 ret = -EINVAL;
5823                                 goto out;
5824                         }
5825
5826                         if (idev->cnf.addr_gen_mode != new_val) {
5827                                 idev->cnf.addr_gen_mode = new_val;
5828                                 addrconf_dev_config(idev->dev);
5829                         }
5830                 }
5831         }
5832
5833 out:
5834         rtnl_unlock();
5835
5836         return ret;
5837 }
5838
5839 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5840                                          void __user *buffer, size_t *lenp,
5841                                          loff_t *ppos)
5842 {
5843         int err;
5844         struct in6_addr addr;
5845         char str[IPV6_MAX_STRLEN];
5846         struct ctl_table lctl = *ctl;
5847         struct net *net = ctl->extra2;
5848         struct ipv6_stable_secret *secret = ctl->data;
5849
5850         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5851                 return -EIO;
5852
5853         lctl.maxlen = IPV6_MAX_STRLEN;
5854         lctl.data = str;
5855
5856         if (!rtnl_trylock())
5857                 return restart_syscall();
5858
5859         if (!write && !secret->initialized) {
5860                 err = -EIO;
5861                 goto out;
5862         }
5863
5864         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5865         if (err >= sizeof(str)) {
5866                 err = -EIO;
5867                 goto out;
5868         }
5869
5870         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5871         if (err || !write)
5872                 goto out;
5873
5874         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5875                 err = -EIO;
5876                 goto out;
5877         }
5878
5879         secret->initialized = true;
5880         secret->secret = addr;
5881
5882         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5883                 struct net_device *dev;
5884
5885                 for_each_netdev(net, dev) {
5886                         struct inet6_dev *idev = __in6_dev_get(dev);
5887
5888                         if (idev) {
5889                                 idev->cnf.addr_gen_mode =
5890                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5891                         }
5892                 }
5893         } else {
5894                 struct inet6_dev *idev = ctl->extra1;
5895
5896                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5897         }
5898
5899 out:
5900         rtnl_unlock();
5901
5902         return err;
5903 }
5904
5905 static
5906 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5907                                                 int write,
5908                                                 void __user *buffer,
5909                                                 size_t *lenp,
5910                                                 loff_t *ppos)
5911 {
5912         int *valp = ctl->data;
5913         int val = *valp;
5914         loff_t pos = *ppos;
5915         struct ctl_table lctl;
5916         int ret;
5917
5918         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5919          * we should not modify it until we get the rtnl lock.
5920          */
5921         lctl = *ctl;
5922         lctl.data = &val;
5923
5924         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5925
5926         if (write)
5927                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5928         if (ret)
5929                 *ppos = pos;
5930         return ret;
5931 }
5932
5933 static
5934 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5935 {
5936         if (rt) {
5937                 if (action)
5938                         rt->dst.flags |= DST_NOPOLICY;
5939                 else
5940                         rt->dst.flags &= ~DST_NOPOLICY;
5941         }
5942 }
5943
5944 static
5945 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5946 {
5947         struct inet6_ifaddr *ifa;
5948
5949         read_lock_bh(&idev->lock);
5950         list_for_each_entry(ifa, &idev->addr_list, if_list) {
5951                 spin_lock(&ifa->lock);
5952                 if (ifa->rt) {
5953                         struct rt6_info *rt = ifa->rt;
5954                         struct fib6_table *table = rt->rt6i_table;
5955                         int cpu;
5956
5957                         read_lock(&table->tb6_lock);
5958                         addrconf_set_nopolicy(ifa->rt, val);
5959                         if (rt->rt6i_pcpu) {
5960                                 for_each_possible_cpu(cpu) {
5961                                         struct rt6_info **rtp;
5962
5963                                         rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5964                                         addrconf_set_nopolicy(*rtp, val);
5965                                 }
5966                         }
5967                         read_unlock(&table->tb6_lock);
5968                 }
5969                 spin_unlock(&ifa->lock);
5970         }
5971         read_unlock_bh(&idev->lock);
5972 }
5973
5974 static
5975 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5976 {
5977         struct inet6_dev *idev;
5978         struct net *net;
5979
5980         if (!rtnl_trylock())
5981                 return restart_syscall();
5982
5983         *valp = val;
5984
5985         net = (struct net *)ctl->extra2;
5986         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5987                 rtnl_unlock();
5988                 return 0;
5989         }
5990
5991         if (valp == &net->ipv6.devconf_all->disable_policy)  {
5992                 struct net_device *dev;
5993
5994                 for_each_netdev(net, dev) {
5995                         idev = __in6_dev_get(dev);
5996                         if (idev)
5997                                 addrconf_disable_policy_idev(idev, val);
5998                 }
5999         } else {
6000                 idev = (struct inet6_dev *)ctl->extra1;
6001                 addrconf_disable_policy_idev(idev, val);
6002         }
6003
6004         rtnl_unlock();
6005         return 0;
6006 }
6007
6008 static
6009 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6010                                    void __user *buffer, size_t *lenp,
6011                                    loff_t *ppos)
6012 {
6013         int *valp = ctl->data;
6014         int val = *valp;
6015         loff_t pos = *ppos;
6016         struct ctl_table lctl;
6017         int ret;
6018
6019         lctl = *ctl;
6020         lctl.data = &val;
6021         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6022
6023         if (write && (*valp != val))
6024                 ret = addrconf_disable_policy(ctl, valp, val);
6025
6026         if (ret)
6027                 *ppos = pos;
6028
6029         return ret;
6030 }
6031
6032 static int minus_one = -1;
6033 static const int one = 1;
6034 static const int two_five_five = 255;
6035
6036 static const struct ctl_table addrconf_sysctl[] = {
6037         {
6038                 .procname       = "forwarding",
6039                 .data           = &ipv6_devconf.forwarding,
6040                 .maxlen         = sizeof(int),
6041                 .mode           = 0644,
6042                 .proc_handler   = addrconf_sysctl_forward,
6043         },
6044         {
6045                 .procname       = "hop_limit",
6046                 .data           = &ipv6_devconf.hop_limit,
6047                 .maxlen         = sizeof(int),
6048                 .mode           = 0644,
6049                 .proc_handler   = proc_dointvec_minmax,
6050                 .extra1         = (void *)&one,
6051                 .extra2         = (void *)&two_five_five,
6052         },
6053         {
6054                 .procname       = "mtu",
6055                 .data           = &ipv6_devconf.mtu6,
6056                 .maxlen         = sizeof(int),
6057                 .mode           = 0644,
6058                 .proc_handler   = addrconf_sysctl_mtu,
6059         },
6060         {
6061                 .procname       = "accept_ra",
6062                 .data           = &ipv6_devconf.accept_ra,
6063                 .maxlen         = sizeof(int),
6064                 .mode           = 0644,
6065                 .proc_handler   = proc_dointvec,
6066         },
6067         {
6068                 .procname       = "accept_redirects",
6069                 .data           = &ipv6_devconf.accept_redirects,
6070                 .maxlen         = sizeof(int),
6071                 .mode           = 0644,
6072                 .proc_handler   = proc_dointvec,
6073         },
6074         {
6075                 .procname       = "autoconf",
6076                 .data           = &ipv6_devconf.autoconf,
6077                 .maxlen         = sizeof(int),
6078                 .mode           = 0644,
6079                 .proc_handler   = proc_dointvec,
6080         },
6081         {
6082                 .procname       = "dad_transmits",
6083                 .data           = &ipv6_devconf.dad_transmits,
6084                 .maxlen         = sizeof(int),
6085                 .mode           = 0644,
6086                 .proc_handler   = proc_dointvec,
6087         },
6088         {
6089                 .procname       = "router_solicitations",
6090                 .data           = &ipv6_devconf.rtr_solicits,
6091                 .maxlen         = sizeof(int),
6092                 .mode           = 0644,
6093                 .proc_handler   = proc_dointvec_minmax,
6094                 .extra1         = &minus_one,
6095         },
6096         {
6097                 .procname       = "router_solicitation_interval",
6098                 .data           = &ipv6_devconf.rtr_solicit_interval,
6099                 .maxlen         = sizeof(int),
6100                 .mode           = 0644,
6101                 .proc_handler   = proc_dointvec_jiffies,
6102         },
6103         {
6104                 .procname       = "router_solicitation_max_interval",
6105                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6106                 .maxlen         = sizeof(int),
6107                 .mode           = 0644,
6108                 .proc_handler   = proc_dointvec_jiffies,
6109         },
6110         {
6111                 .procname       = "router_solicitation_delay",
6112                 .data           = &ipv6_devconf.rtr_solicit_delay,
6113                 .maxlen         = sizeof(int),
6114                 .mode           = 0644,
6115                 .proc_handler   = proc_dointvec_jiffies,
6116         },
6117         {
6118                 .procname       = "force_mld_version",
6119                 .data           = &ipv6_devconf.force_mld_version,
6120                 .maxlen         = sizeof(int),
6121                 .mode           = 0644,
6122                 .proc_handler   = proc_dointvec,
6123         },
6124         {
6125                 .procname       = "mldv1_unsolicited_report_interval",
6126                 .data           =
6127                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6128                 .maxlen         = sizeof(int),
6129                 .mode           = 0644,
6130                 .proc_handler   = proc_dointvec_ms_jiffies,
6131         },
6132         {
6133                 .procname       = "mldv2_unsolicited_report_interval",
6134                 .data           =
6135                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6136                 .maxlen         = sizeof(int),
6137                 .mode           = 0644,
6138                 .proc_handler   = proc_dointvec_ms_jiffies,
6139         },
6140         {
6141                 .procname       = "use_tempaddr",
6142                 .data           = &ipv6_devconf.use_tempaddr,
6143                 .maxlen         = sizeof(int),
6144                 .mode           = 0644,
6145                 .proc_handler   = proc_dointvec,
6146         },
6147         {
6148                 .procname       = "temp_valid_lft",
6149                 .data           = &ipv6_devconf.temp_valid_lft,
6150                 .maxlen         = sizeof(int),
6151                 .mode           = 0644,
6152                 .proc_handler   = proc_dointvec,
6153         },
6154         {
6155                 .procname       = "temp_prefered_lft",
6156                 .data           = &ipv6_devconf.temp_prefered_lft,
6157                 .maxlen         = sizeof(int),
6158                 .mode           = 0644,
6159                 .proc_handler   = proc_dointvec,
6160         },
6161         {
6162                 .procname       = "regen_max_retry",
6163                 .data           = &ipv6_devconf.regen_max_retry,
6164                 .maxlen         = sizeof(int),
6165                 .mode           = 0644,
6166                 .proc_handler   = proc_dointvec,
6167         },
6168         {
6169                 .procname       = "max_desync_factor",
6170                 .data           = &ipv6_devconf.max_desync_factor,
6171                 .maxlen         = sizeof(int),
6172                 .mode           = 0644,
6173                 .proc_handler   = proc_dointvec,
6174         },
6175         {
6176                 .procname       = "max_addresses",
6177                 .data           = &ipv6_devconf.max_addresses,
6178                 .maxlen         = sizeof(int),
6179                 .mode           = 0644,
6180                 .proc_handler   = proc_dointvec,
6181         },
6182         {
6183                 .procname       = "accept_ra_defrtr",
6184                 .data           = &ipv6_devconf.accept_ra_defrtr,
6185                 .maxlen         = sizeof(int),
6186                 .mode           = 0644,
6187                 .proc_handler   = proc_dointvec,
6188         },
6189         {
6190                 .procname       = "accept_ra_min_hop_limit",
6191                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6192                 .maxlen         = sizeof(int),
6193                 .mode           = 0644,
6194                 .proc_handler   = proc_dointvec,
6195         },
6196         {
6197                 .procname       = "accept_ra_pinfo",
6198                 .data           = &ipv6_devconf.accept_ra_pinfo,
6199                 .maxlen         = sizeof(int),
6200                 .mode           = 0644,
6201                 .proc_handler   = proc_dointvec,
6202         },
6203 #ifdef CONFIG_IPV6_ROUTER_PREF
6204         {
6205                 .procname       = "accept_ra_rtr_pref",
6206                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6207                 .maxlen         = sizeof(int),
6208                 .mode           = 0644,
6209                 .proc_handler   = proc_dointvec,
6210         },
6211         {
6212                 .procname       = "router_probe_interval",
6213                 .data           = &ipv6_devconf.rtr_probe_interval,
6214                 .maxlen         = sizeof(int),
6215                 .mode           = 0644,
6216                 .proc_handler   = proc_dointvec_jiffies,
6217         },
6218 #ifdef CONFIG_IPV6_ROUTE_INFO
6219         {
6220                 .procname       = "accept_ra_rt_info_min_plen",
6221                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6222                 .maxlen         = sizeof(int),
6223                 .mode           = 0644,
6224                 .proc_handler   = proc_dointvec,
6225         },
6226         {
6227                 .procname       = "accept_ra_rt_info_max_plen",
6228                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6229                 .maxlen         = sizeof(int),
6230                 .mode           = 0644,
6231                 .proc_handler   = proc_dointvec,
6232         },
6233 #endif
6234 #endif
6235         {
6236                 .procname       = "proxy_ndp",
6237                 .data           = &ipv6_devconf.proxy_ndp,
6238                 .maxlen         = sizeof(int),
6239                 .mode           = 0644,
6240                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6241         },
6242         {
6243                 .procname       = "accept_source_route",
6244                 .data           = &ipv6_devconf.accept_source_route,
6245                 .maxlen         = sizeof(int),
6246                 .mode           = 0644,
6247                 .proc_handler   = proc_dointvec,
6248         },
6249 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6250         {
6251                 .procname       = "optimistic_dad",
6252                 .data           = &ipv6_devconf.optimistic_dad,
6253                 .maxlen         = sizeof(int),
6254                 .mode           = 0644,
6255                 .proc_handler   = proc_dointvec,
6256         },
6257         {
6258                 .procname       = "use_optimistic",
6259                 .data           = &ipv6_devconf.use_optimistic,
6260                 .maxlen         = sizeof(int),
6261                 .mode           = 0644,
6262                 .proc_handler   = proc_dointvec,
6263         },
6264 #endif
6265 #ifdef CONFIG_IPV6_MROUTE
6266         {
6267                 .procname       = "mc_forwarding",
6268                 .data           = &ipv6_devconf.mc_forwarding,
6269                 .maxlen         = sizeof(int),
6270                 .mode           = 0444,
6271                 .proc_handler   = proc_dointvec,
6272         },
6273 #endif
6274         {
6275                 .procname       = "disable_ipv6",
6276                 .data           = &ipv6_devconf.disable_ipv6,
6277                 .maxlen         = sizeof(int),
6278                 .mode           = 0644,
6279                 .proc_handler   = addrconf_sysctl_disable,
6280         },
6281         {
6282                 .procname       = "accept_dad",
6283                 .data           = &ipv6_devconf.accept_dad,
6284                 .maxlen         = sizeof(int),
6285                 .mode           = 0644,
6286                 .proc_handler   = proc_dointvec,
6287         },
6288         {
6289                 .procname       = "force_tllao",
6290                 .data           = &ipv6_devconf.force_tllao,
6291                 .maxlen         = sizeof(int),
6292                 .mode           = 0644,
6293                 .proc_handler   = proc_dointvec
6294         },
6295         {
6296                 .procname       = "ndisc_notify",
6297                 .data           = &ipv6_devconf.ndisc_notify,
6298                 .maxlen         = sizeof(int),
6299                 .mode           = 0644,
6300                 .proc_handler   = proc_dointvec
6301         },
6302         {
6303                 .procname       = "suppress_frag_ndisc",
6304                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6305                 .maxlen         = sizeof(int),
6306                 .mode           = 0644,
6307                 .proc_handler   = proc_dointvec
6308         },
6309         {
6310                 .procname       = "accept_ra_from_local",
6311                 .data           = &ipv6_devconf.accept_ra_from_local,
6312                 .maxlen         = sizeof(int),
6313                 .mode           = 0644,
6314                 .proc_handler   = proc_dointvec,
6315         },
6316         {
6317                 .procname       = "accept_ra_mtu",
6318                 .data           = &ipv6_devconf.accept_ra_mtu,
6319                 .maxlen         = sizeof(int),
6320                 .mode           = 0644,
6321                 .proc_handler   = proc_dointvec,
6322         },
6323         {
6324                 .procname       = "stable_secret",
6325                 .data           = &ipv6_devconf.stable_secret,
6326                 .maxlen         = IPV6_MAX_STRLEN,
6327                 .mode           = 0600,
6328                 .proc_handler   = addrconf_sysctl_stable_secret,
6329         },
6330         {
6331                 .procname       = "use_oif_addrs_only",
6332                 .data           = &ipv6_devconf.use_oif_addrs_only,
6333                 .maxlen         = sizeof(int),
6334                 .mode           = 0644,
6335                 .proc_handler   = proc_dointvec,
6336         },
6337         {
6338                 .procname       = "ignore_routes_with_linkdown",
6339                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6340                 .maxlen         = sizeof(int),
6341                 .mode           = 0644,
6342                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6343         },
6344         {
6345                 .procname       = "drop_unicast_in_l2_multicast",
6346                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6347                 .maxlen         = sizeof(int),
6348                 .mode           = 0644,
6349                 .proc_handler   = proc_dointvec,
6350         },
6351         {
6352                 .procname       = "drop_unsolicited_na",
6353                 .data           = &ipv6_devconf.drop_unsolicited_na,
6354                 .maxlen         = sizeof(int),
6355                 .mode           = 0644,
6356                 .proc_handler   = proc_dointvec,
6357         },
6358         {
6359                 .procname       = "keep_addr_on_down",
6360                 .data           = &ipv6_devconf.keep_addr_on_down,
6361                 .maxlen         = sizeof(int),
6362                 .mode           = 0644,
6363                 .proc_handler   = proc_dointvec,
6364
6365         },
6366         {
6367                 .procname       = "seg6_enabled",
6368                 .data           = &ipv6_devconf.seg6_enabled,
6369                 .maxlen         = sizeof(int),
6370                 .mode           = 0644,
6371                 .proc_handler   = proc_dointvec,
6372         },
6373 #ifdef CONFIG_IPV6_SEG6_HMAC
6374         {
6375                 .procname       = "seg6_require_hmac",
6376                 .data           = &ipv6_devconf.seg6_require_hmac,
6377                 .maxlen         = sizeof(int),
6378                 .mode           = 0644,
6379                 .proc_handler   = proc_dointvec,
6380         },
6381 #endif
6382         {
6383                 .procname       = "enhanced_dad",
6384                 .data           = &ipv6_devconf.enhanced_dad,
6385                 .maxlen         = sizeof(int),
6386                 .mode           = 0644,
6387                 .proc_handler   = proc_dointvec,
6388         },
6389         {
6390                 .procname               = "addr_gen_mode",
6391                 .data                   = &ipv6_devconf.addr_gen_mode,
6392                 .maxlen                 = sizeof(int),
6393                 .mode                   = 0644,
6394                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6395         },
6396         {
6397                 .procname       = "disable_policy",
6398                 .data           = &ipv6_devconf.disable_policy,
6399                 .maxlen         = sizeof(int),
6400                 .mode           = 0644,
6401                 .proc_handler   = addrconf_sysctl_disable_policy,
6402         },
6403         {
6404                 /* sentinel */
6405         }
6406 };
6407
6408 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6409                 struct inet6_dev *idev, struct ipv6_devconf *p)
6410 {
6411         int i, ifindex;
6412         struct ctl_table *table;
6413         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6414
6415         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6416         if (!table)
6417                 goto out;
6418
6419         for (i = 0; table[i].data; i++) {
6420                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6421                 /* If one of these is already set, then it is not safe to
6422                  * overwrite either of them: this makes proc_dointvec_minmax
6423                  * usable.
6424                  */
6425                 if (!table[i].extra1 && !table[i].extra2) {
6426                         table[i].extra1 = idev; /* embedded; no ref */
6427                         table[i].extra2 = net;
6428                 }
6429         }
6430
6431         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6432
6433         p->sysctl_header = register_net_sysctl(net, path, table);
6434         if (!p->sysctl_header)
6435                 goto free;
6436
6437         if (!strcmp(dev_name, "all"))
6438                 ifindex = NETCONFA_IFINDEX_ALL;
6439         else if (!strcmp(dev_name, "default"))
6440                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6441         else
6442                 ifindex = idev->dev->ifindex;
6443         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6444                                      ifindex, p);
6445         return 0;
6446
6447 free:
6448         kfree(table);
6449 out:
6450         return -ENOBUFS;
6451 }
6452
6453 static void __addrconf_sysctl_unregister(struct net *net,
6454                                          struct ipv6_devconf *p, int ifindex)
6455 {
6456         struct ctl_table *table;
6457
6458         if (!p->sysctl_header)
6459                 return;
6460
6461         table = p->sysctl_header->ctl_table_arg;
6462         unregister_net_sysctl_table(p->sysctl_header);
6463         p->sysctl_header = NULL;
6464         kfree(table);
6465
6466         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6467 }
6468
6469 static int addrconf_sysctl_register(struct inet6_dev *idev)
6470 {
6471         int err;
6472
6473         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6474                 return -EINVAL;
6475
6476         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6477                                     &ndisc_ifinfo_sysctl_change);
6478         if (err)
6479                 return err;
6480         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6481                                          idev, &idev->cnf);
6482         if (err)
6483                 neigh_sysctl_unregister(idev->nd_parms);
6484
6485         return err;
6486 }
6487
6488 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6489 {
6490         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6491                                      idev->dev->ifindex);
6492         neigh_sysctl_unregister(idev->nd_parms);
6493 }
6494
6495
6496 #endif
6497
6498 static int __net_init addrconf_init_net(struct net *net)
6499 {
6500         int err = -ENOMEM;
6501         struct ipv6_devconf *all, *dflt;
6502
6503         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6504         if (!all)
6505                 goto err_alloc_all;
6506
6507         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6508         if (!dflt)
6509                 goto err_alloc_dflt;
6510
6511         /* these will be inherited by all namespaces */
6512         dflt->autoconf = ipv6_defaults.autoconf;
6513         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6514
6515         dflt->stable_secret.initialized = false;
6516         all->stable_secret.initialized = false;
6517
6518         net->ipv6.devconf_all = all;
6519         net->ipv6.devconf_dflt = dflt;
6520
6521 #ifdef CONFIG_SYSCTL
6522         err = __addrconf_sysctl_register(net, "all", NULL, all);
6523         if (err < 0)
6524                 goto err_reg_all;
6525
6526         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6527         if (err < 0)
6528                 goto err_reg_dflt;
6529 #endif
6530         return 0;
6531
6532 #ifdef CONFIG_SYSCTL
6533 err_reg_dflt:
6534         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6535 err_reg_all:
6536         kfree(dflt);
6537 #endif
6538 err_alloc_dflt:
6539         kfree(all);
6540 err_alloc_all:
6541         return err;
6542 }
6543
6544 static void __net_exit addrconf_exit_net(struct net *net)
6545 {
6546 #ifdef CONFIG_SYSCTL
6547         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6548                                      NETCONFA_IFINDEX_DEFAULT);
6549         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6550                                      NETCONFA_IFINDEX_ALL);
6551 #endif
6552         kfree(net->ipv6.devconf_dflt);
6553         kfree(net->ipv6.devconf_all);
6554 }
6555
6556 static struct pernet_operations addrconf_ops = {
6557         .init = addrconf_init_net,
6558         .exit = addrconf_exit_net,
6559 };
6560
6561 static struct rtnl_af_ops inet6_ops __read_mostly = {
6562         .family           = AF_INET6,
6563         .fill_link_af     = inet6_fill_link_af,
6564         .get_link_af_size = inet6_get_link_af_size,
6565         .validate_link_af = inet6_validate_link_af,
6566         .set_link_af      = inet6_set_link_af,
6567 };
6568
6569 /*
6570  *      Init / cleanup code
6571  */
6572
6573 int __init addrconf_init(void)
6574 {
6575         struct inet6_dev *idev;
6576         int i, err;
6577
6578         err = ipv6_addr_label_init();
6579         if (err < 0) {
6580                 pr_crit("%s: cannot initialize default policy table: %d\n",
6581                         __func__, err);
6582                 goto out;
6583         }
6584
6585         err = register_pernet_subsys(&addrconf_ops);
6586         if (err < 0)
6587                 goto out_addrlabel;
6588
6589         addrconf_wq = create_workqueue("ipv6_addrconf");
6590         if (!addrconf_wq) {
6591                 err = -ENOMEM;
6592                 goto out_nowq;
6593         }
6594
6595         /* The addrconf netdev notifier requires that loopback_dev
6596          * has it's ipv6 private information allocated and setup
6597          * before it can bring up and give link-local addresses
6598          * to other devices which are up.
6599          *
6600          * Unfortunately, loopback_dev is not necessarily the first
6601          * entry in the global dev_base list of net devices.  In fact,
6602          * it is likely to be the very last entry on that list.
6603          * So this causes the notifier registry below to try and
6604          * give link-local addresses to all devices besides loopback_dev
6605          * first, then loopback_dev, which cases all the non-loopback_dev
6606          * devices to fail to get a link-local address.
6607          *
6608          * So, as a temporary fix, allocate the ipv6 structure for
6609          * loopback_dev first by hand.
6610          * Longer term, all of the dependencies ipv6 has upon the loopback
6611          * device and it being up should be removed.
6612          */
6613         rtnl_lock();
6614         idev = ipv6_add_dev(init_net.loopback_dev);
6615         rtnl_unlock();
6616         if (IS_ERR(idev)) {
6617                 err = PTR_ERR(idev);
6618                 goto errlo;
6619         }
6620
6621         ip6_route_init_special_entries();
6622
6623         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6624                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6625
6626         register_netdevice_notifier(&ipv6_dev_notf);
6627
6628         addrconf_verify();
6629
6630         rtnl_af_register(&inet6_ops);
6631
6632         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6633                               0);
6634         if (err < 0)
6635                 goto errout;
6636
6637         /* Only the first call to __rtnl_register can fail */
6638         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
6639         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
6640         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6641                         inet6_dump_ifaddr, 0);
6642         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6643                         inet6_dump_ifmcaddr, 0);
6644         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6645                         inet6_dump_ifacaddr, 0);
6646         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6647                         inet6_netconf_dump_devconf, 0);
6648
6649         ipv6_addr_label_rtnl_register();
6650
6651         return 0;
6652 errout:
6653         rtnl_af_unregister(&inet6_ops);
6654         unregister_netdevice_notifier(&ipv6_dev_notf);
6655 errlo:
6656         destroy_workqueue(addrconf_wq);
6657 out_nowq:
6658         unregister_pernet_subsys(&addrconf_ops);
6659 out_addrlabel:
6660         ipv6_addr_label_cleanup();
6661 out:
6662         return err;
6663 }
6664
6665 void addrconf_cleanup(void)
6666 {
6667         struct net_device *dev;
6668         int i;
6669
6670         unregister_netdevice_notifier(&ipv6_dev_notf);
6671         unregister_pernet_subsys(&addrconf_ops);
6672         ipv6_addr_label_cleanup();
6673
6674         rtnl_lock();
6675
6676         __rtnl_af_unregister(&inet6_ops);
6677
6678         /* clean dev list */
6679         for_each_netdev(&init_net, dev) {
6680                 if (__in6_dev_get(dev) == NULL)
6681                         continue;
6682                 addrconf_ifdown(dev, 1);
6683         }
6684         addrconf_ifdown(init_net.loopback_dev, 2);
6685
6686         /*
6687          *      Check hash table.
6688          */
6689         spin_lock_bh(&addrconf_hash_lock);
6690         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6691                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6692         spin_unlock_bh(&addrconf_hash_lock);
6693         cancel_delayed_work(&addr_chk_work);
6694         rtnl_unlock();
6695
6696         destroy_workqueue(addrconf_wq);
6697 }