net/ipv6/addrconf.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      IPv6 Address [auto]configuration
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   9  */
  10
  11 /*
  12  *      Changes:
  13  *
  14  *      Janos Farkas                    :       delete timer on ifdown
  15  *      <chexum@bankinf.banki.hu>
  16  *      Andi Kleen                      :       kill double kfree on module
  17  *                                              unload.
  18  *      Maciej W. Rozycki               :       FDDI support
  19  *      sekiya@USAGI                    :       Don't send too many RS
  20  *                                              packets.
  21  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  22  *                                              packets.
  23  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  24  *                                              address validation timer.
  25  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  26  *                                              support.
  27  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  28  *                                              address on a same interface.
  29  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  30  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  31  *                                              seq_file.
  32  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  33  *                                              selection; consider scope,
  34  *                                              status etc.
  35  */
  36
  37 #define pr_fmt(fmt) "IPv6: " fmt
  38
  39 #include <linux/errno.h>
  40 #include <linux/types.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched/signal.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/net.h>
  46 #include <linux/inet.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64 #include <linux/hash.h>
  65
  66 #include <net/net_namespace.h>
  67 #include <net/sock.h>
  68 #include <net/snmp.h>
  69
  70 #include <net/6lowpan.h>
  71 #include <net/firewire.h>
  72 #include <net/ipv6.h>
  73 #include <net/protocol.h>
  74 #include <net/ndisc.h>
  75 #include <net/ip6_route.h>
  76 #include <net/addrconf.h>
  77 #include <net/tcp.h>
  78 #include <net/ip.h>
  79 #include <net/netlink.h>
  80 #include <net/pkt_sched.h>
  81 #include <net/l3mdev.h>
  82 #include <linux/if_tunnel.h>
  83 #include <linux/rtnetlink.h>
  84 #include <linux/netconf.h>
  85 #include <linux/random.h>
  86 #include <linux/uaccess.h>
  87 #include <asm/unaligned.h>
  88
  89 #include <linux/proc_fs.h>
  90 #include <linux/seq_file.h>
  91 #include <linux/export.h>
  92 #include <linux/ioam6.h>
  93
  94 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  95
  96 #define IPV6_MAX_STRLEN \
  97         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
  98
  99 static inline u32 cstamp_delta(unsigned long cstamp)
 100 {
 101         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 102 }
 103
 104 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 105 {
 106         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 107         u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
 108         do_div(tmp, 1000000);
 109         return (s32)tmp;
 110 }
 111
 112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 113 {
 114         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 115         u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
 116         do_div(tmp, 1000000);
 117         if ((s32)tmp > mrt) {
 118                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 119                 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
 120                 do_div(tmp, 1000000);
 121         }
 122         return (s32)tmp;
 123 }
 124
 125 #ifdef CONFIG_SYSCTL
 126 static int addrconf_sysctl_register(struct inet6_dev *idev);
 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 128 #else
 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 130 {
 131         return 0;
 132 }
 133
 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 135 {
 136 }
 137 #endif
 138
 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
 140
 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 142 static int ipv6_count_addresses(const struct inet6_dev *idev);
 143 static int ipv6_generate_stable_address(struct in6_addr *addr,
 144                                         u8 dad_count,
 145                                         const struct inet6_dev *idev);
 146
 147 #define IN6_ADDR_HSIZE_SHIFT    8
 148 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
 149
 150 static void addrconf_verify(struct net *net);
 151 static void addrconf_verify_rtnl(struct net *net);
 152
 153 static struct workqueue_struct *addrconf_wq;
 154
 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 157
 158 static void addrconf_type_change(struct net_device *dev,
 159                                  unsigned long event);
 160 static int addrconf_ifdown(struct net_device *dev, bool unregister);
 161
 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 163                                                   int plen,
 164                                                   const struct net_device *dev,
 165                                                   u32 flags, u32 noflags,
 166                                                   bool no_gw);
 167
 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 169 static void addrconf_dad_work(struct work_struct *w);
 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
 171                                    bool send_na);
 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
 173 static void addrconf_rs_timer(struct timer_list *t);
 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 176
 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 178                                 struct prefix_info *pinfo);
 179
 180 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 181         .forwarding             = 0,
 182         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 183         .mtu6                   = IPV6_MIN_MTU,
 184         .accept_ra              = 1,
 185         .accept_redirects       = 1,
 186         .autoconf               = 1,
 187         .force_mld_version      = 0,
 188         .mldv1_unsolicited_report_interval = 10 * HZ,
 189         .mldv2_unsolicited_report_interval = HZ,
 190         .dad_transmits          = 1,
 191         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 192         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 193         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 194         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 195         .use_tempaddr           = 0,
 196         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 197         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 198         .regen_max_retry        = REGEN_MAX_RETRY,
 199         .max_desync_factor      = MAX_DESYNC_FACTOR,
 200         .max_addresses          = IPV6_MAX_ADDRESSES,
 201         .accept_ra_defrtr       = 1,
 202         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 203         .accept_ra_from_local   = 0,
 204         .accept_ra_min_hop_limit= 1,
 205         .accept_ra_min_lft      = 0,
 206         .accept_ra_pinfo        = 1,
 207 #ifdef CONFIG_IPV6_ROUTER_PREF
 208         .accept_ra_rtr_pref     = 1,
 209         .rtr_probe_interval     = 60 * HZ,
 210 #ifdef CONFIG_IPV6_ROUTE_INFO
 211         .accept_ra_rt_info_min_plen = 0,
 212         .accept_ra_rt_info_max_plen = 0,
 213 #endif
 214 #endif
 215         .proxy_ndp              = 0,
 216         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 217         .disable_ipv6           = 0,
 218         .accept_dad             = 0,
 219         .suppress_frag_ndisc    = 1,
 220         .accept_ra_mtu          = 1,
 221         .stable_secret          = {
 222                 .initialized = false,
 223         },
 224         .use_oif_addrs_only     = 0,
 225         .ignore_routes_with_linkdown = 0,
 226         .keep_addr_on_down      = 0,
 227         .seg6_enabled           = 0,
 228 #ifdef CONFIG_IPV6_SEG6_HMAC
 229         .seg6_require_hmac      = 0,
 230 #endif
 231         .enhanced_dad           = 1,
 232         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 233         .disable_policy         = 0,
 234         .rpl_seg_enabled        = 0,
 235         .ioam6_enabled          = 0,
 236         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 237         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 238         .ndisc_evict_nocarrier  = 1,
 239 };
 240
 241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 242         .forwarding             = 0,
 243         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 244         .mtu6                   = IPV6_MIN_MTU,
 245         .accept_ra              = 1,
 246         .accept_redirects       = 1,
 247         .autoconf               = 1,
 248         .force_mld_version      = 0,
 249         .mldv1_unsolicited_report_interval = 10 * HZ,
 250         .mldv2_unsolicited_report_interval = HZ,
 251         .dad_transmits          = 1,
 252         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 253         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 254         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 255         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 256         .use_tempaddr           = 0,
 257         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 258         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 259         .regen_max_retry        = REGEN_MAX_RETRY,
 260         .max_desync_factor      = MAX_DESYNC_FACTOR,
 261         .max_addresses          = IPV6_MAX_ADDRESSES,
 262         .accept_ra_defrtr       = 1,
 263         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 264         .accept_ra_from_local   = 0,
 265         .accept_ra_min_hop_limit= 1,
 266         .accept_ra_min_lft      = 0,
 267         .accept_ra_pinfo        = 1,
 268 #ifdef CONFIG_IPV6_ROUTER_PREF
 269         .accept_ra_rtr_pref     = 1,
 270         .rtr_probe_interval     = 60 * HZ,
 271 #ifdef CONFIG_IPV6_ROUTE_INFO
 272         .accept_ra_rt_info_min_plen = 0,
 273         .accept_ra_rt_info_max_plen = 0,
 274 #endif
 275 #endif
 276         .proxy_ndp              = 0,
 277         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 278         .disable_ipv6           = 0,
 279         .accept_dad             = 1,
 280         .suppress_frag_ndisc    = 1,
 281         .accept_ra_mtu          = 1,
 282         .stable_secret          = {
 283                 .initialized = false,
 284         },
 285         .use_oif_addrs_only     = 0,
 286         .ignore_routes_with_linkdown = 0,
 287         .keep_addr_on_down      = 0,
 288         .seg6_enabled           = 0,
 289 #ifdef CONFIG_IPV6_SEG6_HMAC
 290         .seg6_require_hmac      = 0,
 291 #endif
 292         .enhanced_dad           = 1,
 293         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 294         .disable_policy         = 0,
 295         .rpl_seg_enabled        = 0,
 296         .ioam6_enabled          = 0,
 297         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 298         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 299         .ndisc_evict_nocarrier  = 1,
 300 };
 301
 302 /* Check if link is ready: is it up and is a valid qdisc available */
 303 static inline bool addrconf_link_ready(const struct net_device *dev)
 304 {
 305         return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
 306 }
 307
 308 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 309 {
 310         if (del_timer(&idev->rs_timer))
 311                 __in6_dev_put(idev);
 312 }
 313
 314 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 315 {
 316         if (cancel_delayed_work(&ifp->dad_work))
 317                 __in6_ifa_put(ifp);
 318 }
 319
 320 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 321                                   unsigned long when)
 322 {
 323         if (!mod_timer(&idev->rs_timer, jiffies + when))
 324                 in6_dev_hold(idev);
 325 }
 326
 327 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 328                                    unsigned long delay)
 329 {
 330         in6_ifa_hold(ifp);
 331         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 332                 in6_ifa_put(ifp);
 333 }
 334
 335 static int snmp6_alloc_dev(struct inet6_dev *idev)
 336 {
 337         int i;
 338
 339         idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
 340         if (!idev->stats.ipv6)
 341                 goto err_ip;
 342
 343         for_each_possible_cpu(i) {
 344                 struct ipstats_mib *addrconf_stats;
 345                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 346                 u64_stats_init(&addrconf_stats->syncp);
 347         }
 348
 349
 350         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 351                                         GFP_KERNEL);
 352         if (!idev->stats.icmpv6dev)
 353                 goto err_icmp;
 354         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 355                                            GFP_KERNEL_ACCOUNT);
 356         if (!idev->stats.icmpv6msgdev)
 357                 goto err_icmpmsg;
 358
 359         return 0;
 360
 361 err_icmpmsg:
 362         kfree(idev->stats.icmpv6dev);
 363 err_icmp:
 364         free_percpu(idev->stats.ipv6);
 365 err_ip:
 366         return -ENOMEM;
 367 }
 368
 369 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 370 {
 371         struct inet6_dev *ndev;
 372         int err = -ENOMEM;
 373
 374         ASSERT_RTNL();
 375
 376         if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
 377                 return ERR_PTR(-EINVAL);
 378
 379         ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
 380         if (!ndev)
 381                 return ERR_PTR(err);
 382
 383         rwlock_init(&ndev->lock);
 384         ndev->dev = dev;
 385         INIT_LIST_HEAD(&ndev->addr_list);
 386         timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
 387         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 388
 389         if (ndev->cnf.stable_secret.initialized)
 390                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 391
 392         ndev->cnf.mtu6 = dev->mtu;
 393         ndev->ra_mtu = 0;
 394         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 395         if (!ndev->nd_parms) {
 396                 kfree(ndev);
 397                 return ERR_PTR(err);
 398         }
 399         if (ndev->cnf.forwarding)
 400                 dev_disable_lro(dev);
 401         /* We refer to the device */
 402         netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
 403
 404         if (snmp6_alloc_dev(ndev) < 0) {
 405                 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
 406                            __func__);
 407                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 408                 netdev_put(dev, &ndev->dev_tracker);
 409                 kfree(ndev);
 410                 return ERR_PTR(err);
 411         }
 412
 413         if (dev != blackhole_netdev) {
 414                 if (snmp6_register_dev(ndev) < 0) {
 415                         netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
 416                                    __func__, dev->name);
 417                         goto err_release;
 418                 }
 419         }
 420         /* One reference from device. */
 421         refcount_set(&ndev->refcnt, 1);
 422
 423         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 424                 ndev->cnf.accept_dad = -1;
 425
 426 #if IS_ENABLED(CONFIG_IPV6_SIT)
 427         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 428                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 429                 ndev->cnf.rtr_solicits = 0;
 430         }
 431 #endif
 432
 433         INIT_LIST_HEAD(&ndev->tempaddr_list);
 434         ndev->desync_factor = U32_MAX;
 435         if ((dev->flags&IFF_LOOPBACK) ||
 436             dev->type == ARPHRD_TUNNEL ||
 437             dev->type == ARPHRD_TUNNEL6 ||
 438             dev->type == ARPHRD_SIT ||
 439             dev->type == ARPHRD_NONE) {
 440                 ndev->cnf.use_tempaddr = -1;
 441         }
 442
 443         ndev->token = in6addr_any;
 444
 445         if (netif_running(dev) && addrconf_link_ready(dev))
 446                 ndev->if_flags |= IF_READY;
 447
 448         ipv6_mc_init_dev(ndev);
 449         ndev->tstamp = jiffies;
 450         if (dev != blackhole_netdev) {
 451                 err = addrconf_sysctl_register(ndev);
 452                 if (err) {
 453                         ipv6_mc_destroy_dev(ndev);
 454                         snmp6_unregister_dev(ndev);
 455                         goto err_release;
 456                 }
 457         }
 458         /* protected by rtnl_lock */
 459         rcu_assign_pointer(dev->ip6_ptr, ndev);
 460
 461         if (dev != blackhole_netdev) {
 462                 /* Join interface-local all-node multicast group */
 463                 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 464
 465                 /* Join all-node multicast group */
 466                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 467
 468                 /* Join all-router multicast group if forwarding is set */
 469                 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 470                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 471         }
 472         return ndev;
 473
 474 err_release:
 475         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 476         ndev->dead = 1;
 477         in6_dev_finish_destroy(ndev);
 478         return ERR_PTR(err);
 479 }
 480
 481 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 482 {
 483         struct inet6_dev *idev;
 484
 485         ASSERT_RTNL();
 486
 487         idev = __in6_dev_get(dev);
 488         if (!idev) {
 489                 idev = ipv6_add_dev(dev);
 490                 if (IS_ERR(idev))
 491                         return idev;
 492         }
 493
 494         if (dev->flags&IFF_UP)
 495                 ipv6_mc_up(idev);
 496         return idev;
 497 }
 498
 499 static int inet6_netconf_msgsize_devconf(int type)
 500 {
 501         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 502                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 503         bool all = false;
 504
 505         if (type == NETCONFA_ALL)
 506                 all = true;
 507
 508         if (all || type == NETCONFA_FORWARDING)
 509                 size += nla_total_size(4);
 510 #ifdef CONFIG_IPV6_MROUTE
 511         if (all || type == NETCONFA_MC_FORWARDING)
 512                 size += nla_total_size(4);
 513 #endif
 514         if (all || type == NETCONFA_PROXY_NEIGH)
 515                 size += nla_total_size(4);
 516
 517         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 518                 size += nla_total_size(4);
 519
 520         return size;
 521 }
 522
 523 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 524                                       struct ipv6_devconf *devconf, u32 portid,
 525                                       u32 seq, int event, unsigned int flags,
 526                                       int type)
 527 {
 528         struct nlmsghdr  *nlh;
 529         struct netconfmsg *ncm;
 530         bool all = false;
 531
 532         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 533                         flags);
 534         if (!nlh)
 535                 return -EMSGSIZE;
 536
 537         if (type == NETCONFA_ALL)
 538                 all = true;
 539
 540         ncm = nlmsg_data(nlh);
 541         ncm->ncm_family = AF_INET6;
 542
 543         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 544                 goto nla_put_failure;
 545
 546         if (!devconf)
 547                 goto out;
 548
 549         if ((all || type == NETCONFA_FORWARDING) &&
 550             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 551                 goto nla_put_failure;
 552 #ifdef CONFIG_IPV6_MROUTE
 553         if ((all || type == NETCONFA_MC_FORWARDING) &&
 554             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 555                         atomic_read(&devconf->mc_forwarding)) < 0)
 556                 goto nla_put_failure;
 557 #endif
 558         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 559             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 560                 goto nla_put_failure;
 561
 562         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 563             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 564                         devconf->ignore_routes_with_linkdown) < 0)
 565                 goto nla_put_failure;
 566
 567 out:
 568         nlmsg_end(skb, nlh);
 569         return 0;
 570
 571 nla_put_failure:
 572         nlmsg_cancel(skb, nlh);
 573         return -EMSGSIZE;
 574 }
 575
 576 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 577                                   int ifindex, struct ipv6_devconf *devconf)
 578 {
 579         struct sk_buff *skb;
 580         int err = -ENOBUFS;
 581
 582         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 583         if (!skb)
 584                 goto errout;
 585
 586         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 587                                          event, 0, type);
 588         if (err < 0) {
 589                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 590                 WARN_ON(err == -EMSGSIZE);
 591                 kfree_skb(skb);
 592                 goto errout;
 593         }
 594         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 595         return;
 596 errout:
 597         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 598 }
 599
 600 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 601         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 602         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 603         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 604         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 605 };
 606
 607 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
 608                                        const struct nlmsghdr *nlh,
 609                                        struct nlattr **tb,
 610                                        struct netlink_ext_ack *extack)
 611 {
 612         int i, err;
 613
 614         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
 615                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
 616                 return -EINVAL;
 617         }
 618
 619         if (!netlink_strict_get_check(skb))
 620                 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
 621                                               tb, NETCONFA_MAX,
 622                                               devconf_ipv6_policy, extack);
 623
 624         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
 625                                             tb, NETCONFA_MAX,
 626                                             devconf_ipv6_policy, extack);
 627         if (err)
 628                 return err;
 629
 630         for (i = 0; i <= NETCONFA_MAX; i++) {
 631                 if (!tb[i])
 632                         continue;
 633
 634                 switch (i) {
 635                 case NETCONFA_IFINDEX:
 636                         break;
 637                 default:
 638                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
 639                         return -EINVAL;
 640                 }
 641         }
 642
 643         return 0;
 644 }
 645
 646 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 647                                      struct nlmsghdr *nlh,
 648                                      struct netlink_ext_ack *extack)
 649 {
 650         struct net *net = sock_net(in_skb->sk);
 651         struct nlattr *tb[NETCONFA_MAX+1];
 652         struct inet6_dev *in6_dev = NULL;
 653         struct net_device *dev = NULL;
 654         struct sk_buff *skb;
 655         struct ipv6_devconf *devconf;
 656         int ifindex;
 657         int err;
 658
 659         err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
 660         if (err < 0)
 661                 return err;
 662
 663         if (!tb[NETCONFA_IFINDEX])
 664                 return -EINVAL;
 665
 666         err = -EINVAL;
 667         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 668         switch (ifindex) {
 669         case NETCONFA_IFINDEX_ALL:
 670                 devconf = net->ipv6.devconf_all;
 671                 break;
 672         case NETCONFA_IFINDEX_DEFAULT:
 673                 devconf = net->ipv6.devconf_dflt;
 674                 break;
 675         default:
 676                 dev = dev_get_by_index(net, ifindex);
 677                 if (!dev)
 678                         return -EINVAL;
 679                 in6_dev = in6_dev_get(dev);
 680                 if (!in6_dev)
 681                         goto errout;
 682                 devconf = &in6_dev->cnf;
 683                 break;
 684         }
 685
 686         err = -ENOBUFS;
 687         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
 688         if (!skb)
 689                 goto errout;
 690
 691         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 692                                          NETLINK_CB(in_skb).portid,
 693                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 694                                          NETCONFA_ALL);
 695         if (err < 0) {
 696                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 697                 WARN_ON(err == -EMSGSIZE);
 698                 kfree_skb(skb);
 699                 goto errout;
 700         }
 701         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 702 errout:
 703         if (in6_dev)
 704                 in6_dev_put(in6_dev);
 705         dev_put(dev);
 706         return err;
 707 }
 708
 709 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 710                                       struct netlink_callback *cb)
 711 {
 712         const struct nlmsghdr *nlh = cb->nlh;
 713         struct net *net = sock_net(skb->sk);
 714         int h, s_h;
 715         int idx, s_idx;
 716         struct net_device *dev;
 717         struct inet6_dev *idev;
 718         struct hlist_head *head;
 719
 720         if (cb->strict_check) {
 721                 struct netlink_ext_ack *extack = cb->extack;
 722                 struct netconfmsg *ncm;
 723
 724                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
 725                         NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
 726                         return -EINVAL;
 727                 }
 728
 729                 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
 730                         NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
 731                         return -EINVAL;
 732                 }
 733         }
 734
 735         s_h = cb->args[0];
 736         s_idx = idx = cb->args[1];
 737
 738         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 739                 idx = 0;
 740                 head = &net->dev_index_head[h];
 741                 rcu_read_lock();
 742                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 743                           net->dev_base_seq;
 744                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 745                         if (idx < s_idx)
 746                                 goto cont;
 747                         idev = __in6_dev_get(dev);
 748                         if (!idev)
 749                                 goto cont;
 750
 751                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 752                                                        &idev->cnf,
 753                                                        NETLINK_CB(cb->skb).portid,
 754                                                        nlh->nlmsg_seq,
 755                                                        RTM_NEWNETCONF,
 756                                                        NLM_F_MULTI,
 757                                                        NETCONFA_ALL) < 0) {
 758                                 rcu_read_unlock();
 759                                 goto done;
 760                         }
 761                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 762 cont:
 763                         idx++;
 764                 }
 765                 rcu_read_unlock();
 766         }
 767         if (h == NETDEV_HASHENTRIES) {
 768                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 769                                                net->ipv6.devconf_all,
 770                                                NETLINK_CB(cb->skb).portid,
 771                                                nlh->nlmsg_seq,
 772                                                RTM_NEWNETCONF, NLM_F_MULTI,
 773                                                NETCONFA_ALL) < 0)
 774                         goto done;
 775                 else
 776                         h++;
 777         }
 778         if (h == NETDEV_HASHENTRIES + 1) {
 779                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 780                                                net->ipv6.devconf_dflt,
 781                                                NETLINK_CB(cb->skb).portid,
 782                                                nlh->nlmsg_seq,
 783                                                RTM_NEWNETCONF, NLM_F_MULTI,
 784                                                NETCONFA_ALL) < 0)
 785                         goto done;
 786                 else
 787                         h++;
 788         }
 789 done:
 790         cb->args[0] = h;
 791         cb->args[1] = idx;
 792
 793         return skb->len;
 794 }
 795
 796 #ifdef CONFIG_SYSCTL
 797 static void dev_forward_change(struct inet6_dev *idev)
 798 {
 799         struct net_device *dev;
 800         struct inet6_ifaddr *ifa;
 801         LIST_HEAD(tmp_addr_list);
 802
 803         if (!idev)
 804                 return;
 805         dev = idev->dev;
 806         if (idev->cnf.forwarding)
 807                 dev_disable_lro(dev);
 808         if (dev->flags & IFF_MULTICAST) {
 809                 if (idev->cnf.forwarding) {
 810                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 811                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 812                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 813                 } else {
 814                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 815                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 816                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 817                 }
 818         }
 819
 820         read_lock_bh(&idev->lock);
 821         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 822                 if (ifa->flags&IFA_F_TENTATIVE)
 823                         continue;
 824                 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
 825         }
 826         read_unlock_bh(&idev->lock);
 827
 828         while (!list_empty(&tmp_addr_list)) {
 829                 ifa = list_first_entry(&tmp_addr_list,
 830                                        struct inet6_ifaddr, if_list_aux);
 831                 list_del(&ifa->if_list_aux);
 832                 if (idev->cnf.forwarding)
 833                         addrconf_join_anycast(ifa);
 834                 else
 835                         addrconf_leave_anycast(ifa);
 836         }
 837
 838         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 839                                      NETCONFA_FORWARDING,
 840                                      dev->ifindex, &idev->cnf);
 841 }
 842
 843
 844 static void addrconf_forward_change(struct net *net, __s32 newf)
 845 {
 846         struct net_device *dev;
 847         struct inet6_dev *idev;
 848
 849         for_each_netdev(net, dev) {
 850                 idev = __in6_dev_get(dev);
 851                 if (idev) {
 852                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 853                         idev->cnf.forwarding = newf;
 854                         if (changed)
 855                                 dev_forward_change(idev);
 856                 }
 857         }
 858 }
 859
 860 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 861 {
 862         struct net *net;
 863         int old;
 864
 865         if (!rtnl_trylock())
 866                 return restart_syscall();
 867
 868         net = (struct net *)table->extra2;
 869         old = *p;
 870         *p = newf;
 871
 872         if (p == &net->ipv6.devconf_dflt->forwarding) {
 873                 if ((!newf) ^ (!old))
 874                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 875                                                      NETCONFA_FORWARDING,
 876                                                      NETCONFA_IFINDEX_DEFAULT,
 877                                                      net->ipv6.devconf_dflt);
 878                 rtnl_unlock();
 879                 return 0;
 880         }
 881
 882         if (p == &net->ipv6.devconf_all->forwarding) {
 883                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 884
 885                 net->ipv6.devconf_dflt->forwarding = newf;
 886                 if ((!newf) ^ (!old_dflt))
 887                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 888                                                      NETCONFA_FORWARDING,
 889                                                      NETCONFA_IFINDEX_DEFAULT,
 890                                                      net->ipv6.devconf_dflt);
 891
 892                 addrconf_forward_change(net, newf);
 893                 if ((!newf) ^ (!old))
 894                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 895                                                      NETCONFA_FORWARDING,
 896                                                      NETCONFA_IFINDEX_ALL,
 897                                                      net->ipv6.devconf_all);
 898         } else if ((!newf) ^ (!old))
 899                 dev_forward_change((struct inet6_dev *)table->extra1);
 900         rtnl_unlock();
 901
 902         if (newf)
 903                 rt6_purge_dflt_routers(net);
 904         return 1;
 905 }
 906
 907 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 908 {
 909         struct net_device *dev;
 910         struct inet6_dev *idev;
 911
 912         for_each_netdev(net, dev) {
 913                 idev = __in6_dev_get(dev);
 914                 if (idev) {
 915                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 916
 917                         idev->cnf.ignore_routes_with_linkdown = newf;
 918                         if (changed)
 919                                 inet6_netconf_notify_devconf(dev_net(dev),
 920                                                              RTM_NEWNETCONF,
 921                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 922                                                              dev->ifindex,
 923                                                              &idev->cnf);
 924                 }
 925         }
 926 }
 927
 928 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 929 {
 930         struct net *net;
 931         int old;
 932
 933         if (!rtnl_trylock())
 934                 return restart_syscall();
 935
 936         net = (struct net *)table->extra2;
 937         old = *p;
 938         *p = newf;
 939
 940         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 941                 if ((!newf) ^ (!old))
 942                         inet6_netconf_notify_devconf(net,
 943                                                      RTM_NEWNETCONF,
 944                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 945                                                      NETCONFA_IFINDEX_DEFAULT,
 946                                                      net->ipv6.devconf_dflt);
 947                 rtnl_unlock();
 948                 return 0;
 949         }
 950
 951         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 952                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 953                 addrconf_linkdown_change(net, newf);
 954                 if ((!newf) ^ (!old))
 955                         inet6_netconf_notify_devconf(net,
 956                                                      RTM_NEWNETCONF,
 957                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 958                                                      NETCONFA_IFINDEX_ALL,
 959                                                      net->ipv6.devconf_all);
 960         }
 961         rtnl_unlock();
 962
 963         return 1;
 964 }
 965
 966 #endif
 967
 968 /* Nobody refers to this ifaddr, destroy it */
 969 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 970 {
 971         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 972
 973 #ifdef NET_REFCNT_DEBUG
 974         pr_debug("%s\n", __func__);
 975 #endif
 976
 977         in6_dev_put(ifp->idev);
 978
 979         if (cancel_delayed_work(&ifp->dad_work))
 980                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 981                           ifp);
 982
 983         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 984                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 985                 return;
 986         }
 987
 988         kfree_rcu(ifp, rcu);
 989 }
 990
 991 static void
 992 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 993 {
 994         struct list_head *p;
 995         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 996
 997         /*
 998          * Each device address list is sorted in order of scope -
 999          * global before linklocal.
1000          */
1001         list_for_each(p, &idev->addr_list) {
1002                 struct inet6_ifaddr *ifa
1003                         = list_entry(p, struct inet6_ifaddr, if_list);
1004                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1005                         break;
1006         }
1007
1008         list_add_tail_rcu(&ifp->if_list, p);
1009 }
1010
1011 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1012 {
1013         u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1014
1015         return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1016 }
1017
1018 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1019                                struct net_device *dev, unsigned int hash)
1020 {
1021         struct inet6_ifaddr *ifp;
1022
1023         hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1024                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1025                         if (!dev || ifp->idev->dev == dev)
1026                                 return true;
1027                 }
1028         }
1029         return false;
1030 }
1031
1032 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1033 {
1034         struct net *net = dev_net(dev);
1035         unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1036         int err = 0;
1037
1038         spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1039
1040         /* Ignore adding duplicate addresses on an interface */
1041         if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1042                 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1043                 err = -EEXIST;
1044         } else {
1045                 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1046         }
1047
1048         spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1049
1050         return err;
1051 }
1052
1053 /* On success it returns ifp with increased reference count */
1054
1055 static struct inet6_ifaddr *
1056 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1057               bool can_block, struct netlink_ext_ack *extack)
1058 {
1059         gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1060         int addr_type = ipv6_addr_type(cfg->pfx);
1061         struct net *net = dev_net(idev->dev);
1062         struct inet6_ifaddr *ifa = NULL;
1063         struct fib6_info *f6i = NULL;
1064         int err = 0;
1065
1066         if (addr_type == IPV6_ADDR_ANY) {
1067                 NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1068                 return ERR_PTR(-EADDRNOTAVAIL);
1069         } else if (addr_type & IPV6_ADDR_MULTICAST &&
1070                    !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1071                 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1072                 return ERR_PTR(-EADDRNOTAVAIL);
1073         } else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1074                    !netif_is_l3_master(idev->dev) &&
1075                    addr_type & IPV6_ADDR_LOOPBACK) {
1076                 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1077                 return ERR_PTR(-EADDRNOTAVAIL);
1078         }
1079
1080         if (idev->dead) {
1081                 NL_SET_ERR_MSG_MOD(extack, "device is going away");
1082                 err = -ENODEV;
1083                 goto out;
1084         }
1085
1086         if (idev->cnf.disable_ipv6) {
1087                 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1088                 err = -EACCES;
1089                 goto out;
1090         }
1091
1092         /* validator notifier needs to be blocking;
1093          * do not call in atomic context
1094          */
1095         if (can_block) {
1096                 struct in6_validator_info i6vi = {
1097                         .i6vi_addr = *cfg->pfx,
1098                         .i6vi_dev = idev,
1099                         .extack = extack,
1100                 };
1101
1102                 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1103                 err = notifier_to_errno(err);
1104                 if (err < 0)
1105                         goto out;
1106         }
1107
1108         ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1109         if (!ifa) {
1110                 err = -ENOBUFS;
1111                 goto out;
1112         }
1113
1114         f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
1115         if (IS_ERR(f6i)) {
1116                 err = PTR_ERR(f6i);
1117                 f6i = NULL;
1118                 goto out;
1119         }
1120
1121         neigh_parms_data_state_setall(idev->nd_parms);
1122
1123         ifa->addr = *cfg->pfx;
1124         if (cfg->peer_pfx)
1125                 ifa->peer_addr = *cfg->peer_pfx;
1126
1127         spin_lock_init(&ifa->lock);
1128         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1129         INIT_HLIST_NODE(&ifa->addr_lst);
1130         ifa->scope = cfg->scope;
1131         ifa->prefix_len = cfg->plen;
1132         ifa->rt_priority = cfg->rt_priority;
1133         ifa->flags = cfg->ifa_flags;
1134         ifa->ifa_proto = cfg->ifa_proto;
1135         /* No need to add the TENTATIVE flag for addresses with NODAD */
1136         if (!(cfg->ifa_flags & IFA_F_NODAD))
1137                 ifa->flags |= IFA_F_TENTATIVE;
1138         ifa->valid_lft = cfg->valid_lft;
1139         ifa->prefered_lft = cfg->preferred_lft;
1140         ifa->cstamp = ifa->tstamp = jiffies;
1141         ifa->tokenized = false;
1142
1143         ifa->rt = f6i;
1144
1145         ifa->idev = idev;
1146         in6_dev_hold(idev);
1147
1148         /* For caller */
1149         refcount_set(&ifa->refcnt, 1);
1150
1151         rcu_read_lock();
1152
1153         err = ipv6_add_addr_hash(idev->dev, ifa);
1154         if (err < 0) {
1155                 rcu_read_unlock();
1156                 goto out;
1157         }
1158
1159         write_lock_bh(&idev->lock);
1160
1161         /* Add to inet6_dev unicast addr list. */
1162         ipv6_link_dev_addr(idev, ifa);
1163
1164         if (ifa->flags&IFA_F_TEMPORARY) {
1165                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1166                 in6_ifa_hold(ifa);
1167         }
1168
1169         in6_ifa_hold(ifa);
1170         write_unlock_bh(&idev->lock);
1171
1172         rcu_read_unlock();
1173
1174         inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1175 out:
1176         if (unlikely(err < 0)) {
1177                 fib6_info_release(f6i);
1178
1179                 if (ifa) {
1180                         if (ifa->idev)
1181                                 in6_dev_put(ifa->idev);
1182                         kfree(ifa);
1183                 }
1184                 ifa = ERR_PTR(err);
1185         }
1186
1187         return ifa;
1188 }
1189
1190 enum cleanup_prefix_rt_t {
1191         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1192         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1193         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1194 };
1195
1196 /*
1197  * Check, whether the prefix for ifp would still need a prefix route
1198  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1199  * constants.
1200  *
1201  * 1) we don't purge prefix if address was not permanent.
1202  *    prefix is managed by its own lifetime.
1203  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1204  * 3) if there are no addresses, delete prefix.
1205  * 4) if there are still other permanent address(es),
1206  *    corresponding prefix is still permanent.
1207  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1208  *    don't purge the prefix, assume user space is managing it.
1209  * 6) otherwise, update prefix lifetime to the
1210  *    longest valid lifetime among the corresponding
1211  *    addresses on the device.
1212  *    Note: subsequent RA will update lifetime.
1213  **/
1214 static enum cleanup_prefix_rt_t
1215 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1216 {
1217         struct inet6_ifaddr *ifa;
1218         struct inet6_dev *idev = ifp->idev;
1219         unsigned long lifetime;
1220         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1221
1222         *expires = jiffies;
1223
1224         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1225                 if (ifa == ifp)
1226                         continue;
1227                 if (ifa->prefix_len != ifp->prefix_len ||
1228                     !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1229                                        ifp->prefix_len))
1230                         continue;
1231                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1232                         return CLEANUP_PREFIX_RT_NOP;
1233
1234                 action = CLEANUP_PREFIX_RT_EXPIRE;
1235
1236                 spin_lock(&ifa->lock);
1237
1238                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1239                 /*
1240                  * Note: Because this address is
1241                  * not permanent, lifetime <
1242                  * LONG_MAX / HZ here.
1243                  */
1244                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1245                         *expires = ifa->tstamp + lifetime * HZ;
1246                 spin_unlock(&ifa->lock);
1247         }
1248
1249         return action;
1250 }
1251
1252 static void
1253 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1254                      bool del_rt, bool del_peer)
1255 {
1256         struct fib6_info *f6i;
1257
1258         f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1259                                         ifp->prefix_len,
1260                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
1261         if (f6i) {
1262                 if (del_rt)
1263                         ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1264                 else {
1265                         if (!(f6i->fib6_flags & RTF_EXPIRES))
1266                                 fib6_set_expires(f6i, expires);
1267                         fib6_info_release(f6i);
1268                 }
1269         }
1270 }
1271
1272
1273 /* This function wants to get referenced ifp and releases it before return */
1274
1275 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1276 {
1277         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1278         struct net *net = dev_net(ifp->idev->dev);
1279         unsigned long expires;
1280         int state;
1281
1282         ASSERT_RTNL();
1283
1284         spin_lock_bh(&ifp->lock);
1285         state = ifp->state;
1286         ifp->state = INET6_IFADDR_STATE_DEAD;
1287         spin_unlock_bh(&ifp->lock);
1288
1289         if (state == INET6_IFADDR_STATE_DEAD)
1290                 goto out;
1291
1292         spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1293         hlist_del_init_rcu(&ifp->addr_lst);
1294         spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1295
1296         write_lock_bh(&ifp->idev->lock);
1297
1298         if (ifp->flags&IFA_F_TEMPORARY) {
1299                 list_del(&ifp->tmp_list);
1300                 if (ifp->ifpub) {
1301                         in6_ifa_put(ifp->ifpub);
1302                         ifp->ifpub = NULL;
1303                 }
1304                 __in6_ifa_put(ifp);
1305         }
1306
1307         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1308                 action = check_cleanup_prefix_route(ifp, &expires);
1309
1310         list_del_rcu(&ifp->if_list);
1311         __in6_ifa_put(ifp);
1312
1313         write_unlock_bh(&ifp->idev->lock);
1314
1315         addrconf_del_dad_work(ifp);
1316
1317         ipv6_ifa_notify(RTM_DELADDR, ifp);
1318
1319         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1320
1321         if (action != CLEANUP_PREFIX_RT_NOP) {
1322                 cleanup_prefix_route(ifp, expires,
1323                         action == CLEANUP_PREFIX_RT_DEL, false);
1324         }
1325
1326         /* clean up prefsrc entries */
1327         rt6_remove_prefsrc(ifp);
1328 out:
1329         in6_ifa_put(ifp);
1330 }
1331
1332 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1333 {
1334         struct inet6_dev *idev = ifp->idev;
1335         unsigned long tmp_tstamp, age;
1336         unsigned long regen_advance;
1337         unsigned long now = jiffies;
1338         s32 cnf_temp_preferred_lft;
1339         struct inet6_ifaddr *ift;
1340         struct ifa6_config cfg;
1341         long max_desync_factor;
1342         struct in6_addr addr;
1343         int ret = 0;
1344
1345         write_lock_bh(&idev->lock);
1346
1347 retry:
1348         in6_dev_hold(idev);
1349         if (idev->cnf.use_tempaddr <= 0) {
1350                 write_unlock_bh(&idev->lock);
1351                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1352                 in6_dev_put(idev);
1353                 ret = -1;
1354                 goto out;
1355         }
1356         spin_lock_bh(&ifp->lock);
1357         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1358                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1359                 spin_unlock_bh(&ifp->lock);
1360                 write_unlock_bh(&idev->lock);
1361                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1362                         __func__);
1363                 in6_dev_put(idev);
1364                 ret = -1;
1365                 goto out;
1366         }
1367         in6_ifa_hold(ifp);
1368         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1369         ipv6_gen_rnd_iid(&addr);
1370
1371         age = (now - ifp->tstamp) / HZ;
1372
1373         regen_advance = idev->cnf.regen_max_retry *
1374                         idev->cnf.dad_transmits *
1375                         max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1376
1377         /* recalculate max_desync_factor each time and update
1378          * idev->desync_factor if it's larger
1379          */
1380         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1381         max_desync_factor = min_t(long,
1382                                   idev->cnf.max_desync_factor,
1383                                   cnf_temp_preferred_lft - regen_advance);
1384
1385         if (unlikely(idev->desync_factor > max_desync_factor)) {
1386                 if (max_desync_factor > 0) {
1387                         get_random_bytes(&idev->desync_factor,
1388                                          sizeof(idev->desync_factor));
1389                         idev->desync_factor %= max_desync_factor;
1390                 } else {
1391                         idev->desync_factor = 0;
1392                 }
1393         }
1394
1395         memset(&cfg, 0, sizeof(cfg));
1396         cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1397                               idev->cnf.temp_valid_lft + age);
1398         cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1399         cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1400
1401         cfg.plen = ifp->prefix_len;
1402         tmp_tstamp = ifp->tstamp;
1403         spin_unlock_bh(&ifp->lock);
1404
1405         write_unlock_bh(&idev->lock);
1406
1407         /* A temporary address is created only if this calculated Preferred
1408          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1409          * an implementation must not create a temporary address with a zero
1410          * Preferred Lifetime.
1411          * Use age calculation as in addrconf_verify to avoid unnecessary
1412          * temporary addresses being generated.
1413          */
1414         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1415         if (cfg.preferred_lft <= regen_advance + age) {
1416                 in6_ifa_put(ifp);
1417                 in6_dev_put(idev);
1418                 ret = -1;
1419                 goto out;
1420         }
1421
1422         cfg.ifa_flags = IFA_F_TEMPORARY;
1423         /* set in addrconf_prefix_rcv() */
1424         if (ifp->flags & IFA_F_OPTIMISTIC)
1425                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1426
1427         cfg.pfx = &addr;
1428         cfg.scope = ipv6_addr_scope(cfg.pfx);
1429
1430         ift = ipv6_add_addr(idev, &cfg, block, NULL);
1431         if (IS_ERR(ift)) {
1432                 in6_ifa_put(ifp);
1433                 in6_dev_put(idev);
1434                 pr_info("%s: retry temporary address regeneration\n", __func__);
1435                 write_lock_bh(&idev->lock);
1436                 goto retry;
1437         }
1438
1439         spin_lock_bh(&ift->lock);
1440         ift->ifpub = ifp;
1441         ift->cstamp = now;
1442         ift->tstamp = tmp_tstamp;
1443         spin_unlock_bh(&ift->lock);
1444
1445         addrconf_dad_start(ift);
1446         in6_ifa_put(ift);
1447         in6_dev_put(idev);
1448 out:
1449         return ret;
1450 }
1451
1452 /*
1453  *      Choose an appropriate source address (RFC3484)
1454  */
1455 enum {
1456         IPV6_SADDR_RULE_INIT = 0,
1457         IPV6_SADDR_RULE_LOCAL,
1458         IPV6_SADDR_RULE_SCOPE,
1459         IPV6_SADDR_RULE_PREFERRED,
1460 #ifdef CONFIG_IPV6_MIP6
1461         IPV6_SADDR_RULE_HOA,
1462 #endif
1463         IPV6_SADDR_RULE_OIF,
1464         IPV6_SADDR_RULE_LABEL,
1465         IPV6_SADDR_RULE_PRIVACY,
1466         IPV6_SADDR_RULE_ORCHID,
1467         IPV6_SADDR_RULE_PREFIX,
1468 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1469         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1470 #endif
1471         IPV6_SADDR_RULE_MAX
1472 };
1473
1474 struct ipv6_saddr_score {
1475         int                     rule;
1476         int                     addr_type;
1477         struct inet6_ifaddr     *ifa;
1478         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1479         int                     scopedist;
1480         int                     matchlen;
1481 };
1482
1483 struct ipv6_saddr_dst {
1484         const struct in6_addr *addr;
1485         int ifindex;
1486         int scope;
1487         int label;
1488         unsigned int prefs;
1489 };
1490
1491 static inline int ipv6_saddr_preferred(int type)
1492 {
1493         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1494                 return 1;
1495         return 0;
1496 }
1497
1498 static bool ipv6_use_optimistic_addr(struct net *net,
1499                                      struct inet6_dev *idev)
1500 {
1501 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1502         if (!idev)
1503                 return false;
1504         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1505                 return false;
1506         if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1507                 return false;
1508
1509         return true;
1510 #else
1511         return false;
1512 #endif
1513 }
1514
1515 static bool ipv6_allow_optimistic_dad(struct net *net,
1516                                       struct inet6_dev *idev)
1517 {
1518 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1519         if (!idev)
1520                 return false;
1521         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1522                 return false;
1523
1524         return true;
1525 #else
1526         return false;
1527 #endif
1528 }
1529
1530 static int ipv6_get_saddr_eval(struct net *net,
1531                                struct ipv6_saddr_score *score,
1532                                struct ipv6_saddr_dst *dst,
1533                                int i)
1534 {
1535         int ret;
1536
1537         if (i <= score->rule) {
1538                 switch (i) {
1539                 case IPV6_SADDR_RULE_SCOPE:
1540                         ret = score->scopedist;
1541                         break;
1542                 case IPV6_SADDR_RULE_PREFIX:
1543                         ret = score->matchlen;
1544                         break;
1545                 default:
1546                         ret = !!test_bit(i, score->scorebits);
1547                 }
1548                 goto out;
1549         }
1550
1551         switch (i) {
1552         case IPV6_SADDR_RULE_INIT:
1553                 /* Rule 0: remember if hiscore is not ready yet */
1554                 ret = !!score->ifa;
1555                 break;
1556         case IPV6_SADDR_RULE_LOCAL:
1557                 /* Rule 1: Prefer same address */
1558                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1559                 break;
1560         case IPV6_SADDR_RULE_SCOPE:
1561                 /* Rule 2: Prefer appropriate scope
1562                  *
1563                  *      ret
1564                  *       ^
1565                  *    -1 |  d 15
1566                  *    ---+--+-+---> scope
1567                  *       |
1568                  *       |             d is scope of the destination.
1569                  *  B-d  |  \
1570                  *       |   \      <- smaller scope is better if
1571                  *  B-15 |    \        if scope is enough for destination.
1572                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1573                  * d-C-1 | /
1574                  *       |/         <- greater is better
1575                  *   -C  /             if scope is not enough for destination.
1576                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1577                  *
1578                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1579                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1580                  * Assume B = 0 and we get C > 29.
1581                  */
1582                 ret = __ipv6_addr_src_scope(score->addr_type);
1583                 if (ret >= dst->scope)
1584                         ret = -ret;
1585                 else
1586                         ret -= 128;     /* 30 is enough */
1587                 score->scopedist = ret;
1588                 break;
1589         case IPV6_SADDR_RULE_PREFERRED:
1590             {
1591                 /* Rule 3: Avoid deprecated and optimistic addresses */
1592                 u8 avoid = IFA_F_DEPRECATED;
1593
1594                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1595                         avoid |= IFA_F_OPTIMISTIC;
1596                 ret = ipv6_saddr_preferred(score->addr_type) ||
1597                       !(score->ifa->flags & avoid);
1598                 break;
1599             }
1600 #ifdef CONFIG_IPV6_MIP6
1601         case IPV6_SADDR_RULE_HOA:
1602             {
1603                 /* Rule 4: Prefer home address */
1604                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1605                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1606                 break;
1607             }
1608 #endif
1609         case IPV6_SADDR_RULE_OIF:
1610                 /* Rule 5: Prefer outgoing interface */
1611                 ret = (!dst->ifindex ||
1612                        dst->ifindex == score->ifa->idev->dev->ifindex);
1613                 break;
1614         case IPV6_SADDR_RULE_LABEL:
1615                 /* Rule 6: Prefer matching label */
1616                 ret = ipv6_addr_label(net,
1617                                       &score->ifa->addr, score->addr_type,
1618                                       score->ifa->idev->dev->ifindex) == dst->label;
1619                 break;
1620         case IPV6_SADDR_RULE_PRIVACY:
1621             {
1622                 /* Rule 7: Prefer public address
1623                  * Note: prefer temporary address if use_tempaddr >= 2
1624                  */
1625                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1626                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1627                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1628                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1629                 break;
1630             }
1631         case IPV6_SADDR_RULE_ORCHID:
1632                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1633                  *          non-ORCHID vs non-ORCHID
1634                  */
1635                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1636                         ipv6_addr_orchid(dst->addr));
1637                 break;
1638         case IPV6_SADDR_RULE_PREFIX:
1639                 /* Rule 8: Use longest matching prefix */
1640                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1641                 if (ret > score->ifa->prefix_len)
1642                         ret = score->ifa->prefix_len;
1643                 score->matchlen = ret;
1644                 break;
1645 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1646         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1647                 /* Optimistic addresses still have lower precedence than other
1648                  * preferred addresses.
1649                  */
1650                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1651                 break;
1652 #endif
1653         default:
1654                 ret = 0;
1655         }
1656
1657         if (ret)
1658                 __set_bit(i, score->scorebits);
1659         score->rule = i;
1660 out:
1661         return ret;
1662 }
1663
1664 static int __ipv6_dev_get_saddr(struct net *net,
1665                                 struct ipv6_saddr_dst *dst,
1666                                 struct inet6_dev *idev,
1667                                 struct ipv6_saddr_score *scores,
1668                                 int hiscore_idx)
1669 {
1670         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1671
1672         list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1673                 int i;
1674
1675                 /*
1676                  * - Tentative Address (RFC2462 section 5.4)
1677                  *  - A tentative address is not considered
1678                  *    "assigned to an interface" in the traditional
1679                  *    sense, unless it is also flagged as optimistic.
1680                  * - Candidate Source Address (section 4)
1681                  *  - In any case, anycast addresses, multicast
1682                  *    addresses, and the unspecified address MUST
1683                  *    NOT be included in a candidate set.
1684                  */
1685                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1686                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1687                         continue;
1688
1689                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1690
1691                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1692                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1693                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1694                                             idev->dev->name);
1695                         continue;
1696                 }
1697
1698                 score->rule = -1;
1699                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1700
1701                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1702                         int minihiscore, miniscore;
1703
1704                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1705                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1706
1707                         if (minihiscore > miniscore) {
1708                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1709                                     score->scopedist > 0) {
1710                                         /*
1711                                          * special case:
1712                                          * each remaining entry
1713                                          * has too small (not enough)
1714                                          * scope, because ifa entries
1715                                          * are sorted by their scope
1716                                          * values.
1717                                          */
1718                                         goto out;
1719                                 }
1720                                 break;
1721                         } else if (minihiscore < miniscore) {
1722                                 swap(hiscore, score);
1723                                 hiscore_idx = 1 - hiscore_idx;
1724
1725                                 /* restore our iterator */
1726                                 score->ifa = hiscore->ifa;
1727
1728                                 break;
1729                         }
1730                 }
1731         }
1732 out:
1733         return hiscore_idx;
1734 }
1735
1736 static int ipv6_get_saddr_master(struct net *net,
1737                                  const struct net_device *dst_dev,
1738                                  const struct net_device *master,
1739                                  struct ipv6_saddr_dst *dst,
1740                                  struct ipv6_saddr_score *scores,
1741                                  int hiscore_idx)
1742 {
1743         struct inet6_dev *idev;
1744
1745         idev = __in6_dev_get(dst_dev);
1746         if (idev)
1747                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1748                                                    scores, hiscore_idx);
1749
1750         idev = __in6_dev_get(master);
1751         if (idev)
1752                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1753                                                    scores, hiscore_idx);
1754
1755         return hiscore_idx;
1756 }
1757
1758 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1759                        const struct in6_addr *daddr, unsigned int prefs,
1760                        struct in6_addr *saddr)
1761 {
1762         struct ipv6_saddr_score scores[2], *hiscore;
1763         struct ipv6_saddr_dst dst;
1764         struct inet6_dev *idev;
1765         struct net_device *dev;
1766         int dst_type;
1767         bool use_oif_addr = false;
1768         int hiscore_idx = 0;
1769         int ret = 0;
1770
1771         dst_type = __ipv6_addr_type(daddr);
1772         dst.addr = daddr;
1773         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1774         dst.scope = __ipv6_addr_src_scope(dst_type);
1775         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1776         dst.prefs = prefs;
1777
1778         scores[hiscore_idx].rule = -1;
1779         scores[hiscore_idx].ifa = NULL;
1780
1781         rcu_read_lock();
1782
1783         /* Candidate Source Address (section 4)
1784          *  - multicast and link-local destination address,
1785          *    the set of candidate source address MUST only
1786          *    include addresses assigned to interfaces
1787          *    belonging to the same link as the outgoing
1788          *    interface.
1789          * (- For site-local destination addresses, the
1790          *    set of candidate source addresses MUST only
1791          *    include addresses assigned to interfaces
1792          *    belonging to the same site as the outgoing
1793          *    interface.)
1794          *  - "It is RECOMMENDED that the candidate source addresses
1795          *    be the set of unicast addresses assigned to the
1796          *    interface that will be used to send to the destination
1797          *    (the 'outgoing' interface)." (RFC 6724)
1798          */
1799         if (dst_dev) {
1800                 idev = __in6_dev_get(dst_dev);
1801                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1802                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1803                     (idev && idev->cnf.use_oif_addrs_only)) {
1804                         use_oif_addr = true;
1805                 }
1806         }
1807
1808         if (use_oif_addr) {
1809                 if (idev)
1810                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1811         } else {
1812                 const struct net_device *master;
1813                 int master_idx = 0;
1814
1815                 /* if dst_dev exists and is enslaved to an L3 device, then
1816                  * prefer addresses from dst_dev and then the master over
1817                  * any other enslaved devices in the L3 domain.
1818                  */
1819                 master = l3mdev_master_dev_rcu(dst_dev);
1820                 if (master) {
1821                         master_idx = master->ifindex;
1822
1823                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1824                                                             master, &dst,
1825                                                             scores, hiscore_idx);
1826
1827                         if (scores[hiscore_idx].ifa)
1828                                 goto out;
1829                 }
1830
1831                 for_each_netdev_rcu(net, dev) {
1832                         /* only consider addresses on devices in the
1833                          * same L3 domain
1834                          */
1835                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1836                                 continue;
1837                         idev = __in6_dev_get(dev);
1838                         if (!idev)
1839                                 continue;
1840                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1841                 }
1842         }
1843
1844 out:
1845         hiscore = &scores[hiscore_idx];
1846         if (!hiscore->ifa)
1847                 ret = -EADDRNOTAVAIL;
1848         else
1849                 *saddr = hiscore->ifa->addr;
1850
1851         rcu_read_unlock();
1852         return ret;
1853 }
1854 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1855
1856 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1857                               u32 banned_flags)
1858 {
1859         struct inet6_ifaddr *ifp;
1860         int err = -EADDRNOTAVAIL;
1861
1862         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1863                 if (ifp->scope > IFA_LINK)
1864                         break;
1865                 if (ifp->scope == IFA_LINK &&
1866                     !(ifp->flags & banned_flags)) {
1867                         *addr = ifp->addr;
1868                         err = 0;
1869                         break;
1870                 }
1871         }
1872         return err;
1873 }
1874
1875 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1876                     u32 banned_flags)
1877 {
1878         struct inet6_dev *idev;
1879         int err = -EADDRNOTAVAIL;
1880
1881         rcu_read_lock();
1882         idev = __in6_dev_get(dev);
1883         if (idev) {
1884                 read_lock_bh(&idev->lock);
1885                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1886                 read_unlock_bh(&idev->lock);
1887         }
1888         rcu_read_unlock();
1889         return err;
1890 }
1891
1892 static int ipv6_count_addresses(const struct inet6_dev *idev)
1893 {
1894         const struct inet6_ifaddr *ifp;
1895         int cnt = 0;
1896
1897         rcu_read_lock();
1898         list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1899                 cnt++;
1900         rcu_read_unlock();
1901         return cnt;
1902 }
1903
1904 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1905                   const struct net_device *dev, int strict)
1906 {
1907         return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1908                                        strict, IFA_F_TENTATIVE);
1909 }
1910 EXPORT_SYMBOL(ipv6_chk_addr);
1911
1912 /* device argument is used to find the L3 domain of interest. If
1913  * skip_dev_check is set, then the ifp device is not checked against
1914  * the passed in dev argument. So the 2 cases for addresses checks are:
1915  *   1. does the address exist in the L3 domain that dev is part of
1916  *      (skip_dev_check = true), or
1917  *
1918  *   2. does the address exist on the specific device
1919  *      (skip_dev_check = false)
1920  */
1921 static struct net_device *
1922 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1923                           const struct net_device *dev, bool skip_dev_check,
1924                           int strict, u32 banned_flags)
1925 {
1926         unsigned int hash = inet6_addr_hash(net, addr);
1927         struct net_device *l3mdev, *ndev;
1928         struct inet6_ifaddr *ifp;
1929         u32 ifp_flags;
1930
1931         rcu_read_lock();
1932
1933         l3mdev = l3mdev_master_dev_rcu(dev);
1934         if (skip_dev_check)
1935                 dev = NULL;
1936
1937         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1938                 ndev = ifp->idev->dev;
1939
1940                 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1941                         continue;
1942
1943                 /* Decouple optimistic from tentative for evaluation here.
1944                  * Ban optimistic addresses explicitly, when required.
1945                  */
1946                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1947                             ? (ifp->flags&~IFA_F_TENTATIVE)
1948                             : ifp->flags;
1949                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1950                     !(ifp_flags&banned_flags) &&
1951                     (!dev || ndev == dev ||
1952                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1953                         rcu_read_unlock();
1954                         return ndev;
1955                 }
1956         }
1957
1958         rcu_read_unlock();
1959         return NULL;
1960 }
1961
1962 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1963                             const struct net_device *dev, bool skip_dev_check,
1964                             int strict, u32 banned_flags)
1965 {
1966         return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1967                                          strict, banned_flags) ? 1 : 0;
1968 }
1969 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1970
1971
1972 /* Compares an address/prefix_len with addresses on device @dev.
1973  * If one is found it returns true.
1974  */
1975 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1976         const unsigned int prefix_len, struct net_device *dev)
1977 {
1978         const struct inet6_ifaddr *ifa;
1979         const struct inet6_dev *idev;
1980         bool ret = false;
1981
1982         rcu_read_lock();
1983         idev = __in6_dev_get(dev);
1984         if (idev) {
1985                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1986                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1987                         if (ret)
1988                                 break;
1989                 }
1990         }
1991         rcu_read_unlock();
1992
1993         return ret;
1994 }
1995 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1996
1997 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1998 {
1999         const struct inet6_ifaddr *ifa;
2000         const struct inet6_dev *idev;
2001         int     onlink;
2002
2003         onlink = 0;
2004         rcu_read_lock();
2005         idev = __in6_dev_get(dev);
2006         if (idev) {
2007                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2008                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
2009                                                    ifa->prefix_len);
2010                         if (onlink)
2011                                 break;
2012                 }
2013         }
2014         rcu_read_unlock();
2015         return onlink;
2016 }
2017 EXPORT_SYMBOL(ipv6_chk_prefix);
2018
2019 /**
2020  * ipv6_dev_find - find the first device with a given source address.
2021  * @net: the net namespace
2022  * @addr: the source address
2023  * @dev: used to find the L3 domain of interest
2024  *
2025  * The caller should be protected by RCU, or RTNL.
2026  */
2027 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2028                                  struct net_device *dev)
2029 {
2030         return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2031                                          IFA_F_TENTATIVE);
2032 }
2033 EXPORT_SYMBOL(ipv6_dev_find);
2034
2035 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2036                                      struct net_device *dev, int strict)
2037 {
2038         unsigned int hash = inet6_addr_hash(net, addr);
2039         struct inet6_ifaddr *ifp, *result = NULL;
2040
2041         rcu_read_lock();
2042         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2043                 if (ipv6_addr_equal(&ifp->addr, addr)) {
2044                         if (!dev || ifp->idev->dev == dev ||
2045                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2046                                 result = ifp;
2047                                 in6_ifa_hold(ifp);
2048                                 break;
2049                         }
2050                 }
2051         }
2052         rcu_read_unlock();
2053
2054         return result;
2055 }
2056
2057 /* Gets referenced address, destroys ifaddr */
2058
2059 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2060 {
2061         if (dad_failed)
2062                 ifp->flags |= IFA_F_DADFAILED;
2063
2064         if (ifp->flags&IFA_F_TEMPORARY) {
2065                 struct inet6_ifaddr *ifpub;
2066                 spin_lock_bh(&ifp->lock);
2067                 ifpub = ifp->ifpub;
2068                 if (ifpub) {
2069                         in6_ifa_hold(ifpub);
2070                         spin_unlock_bh(&ifp->lock);
2071                         ipv6_create_tempaddr(ifpub, true);
2072                         in6_ifa_put(ifpub);
2073                 } else {
2074                         spin_unlock_bh(&ifp->lock);
2075                 }
2076                 ipv6_del_addr(ifp);
2077         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2078                 spin_lock_bh(&ifp->lock);
2079                 addrconf_del_dad_work(ifp);
2080                 ifp->flags |= IFA_F_TENTATIVE;
2081                 if (dad_failed)
2082                         ifp->flags &= ~IFA_F_OPTIMISTIC;
2083                 spin_unlock_bh(&ifp->lock);
2084                 if (dad_failed)
2085                         ipv6_ifa_notify(0, ifp);
2086                 in6_ifa_put(ifp);
2087         } else {
2088                 ipv6_del_addr(ifp);
2089         }
2090 }
2091
2092 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2093 {
2094         int err = -ENOENT;
2095
2096         spin_lock_bh(&ifp->lock);
2097         if (ifp->state == INET6_IFADDR_STATE_DAD) {
2098                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2099                 err = 0;
2100         }
2101         spin_unlock_bh(&ifp->lock);
2102
2103         return err;
2104 }
2105
2106 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2107 {
2108         struct inet6_dev *idev = ifp->idev;
2109         struct net *net = dev_net(idev->dev);
2110
2111         if (addrconf_dad_end(ifp)) {
2112                 in6_ifa_put(ifp);
2113                 return;
2114         }
2115
2116         net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2117                              ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2118
2119         spin_lock_bh(&ifp->lock);
2120
2121         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2122                 struct in6_addr new_addr;
2123                 struct inet6_ifaddr *ifp2;
2124                 int retries = ifp->stable_privacy_retry + 1;
2125                 struct ifa6_config cfg = {
2126                         .pfx = &new_addr,
2127                         .plen = ifp->prefix_len,
2128                         .ifa_flags = ifp->flags,
2129                         .valid_lft = ifp->valid_lft,
2130                         .preferred_lft = ifp->prefered_lft,
2131                         .scope = ifp->scope,
2132                 };
2133
2134                 if (retries > net->ipv6.sysctl.idgen_retries) {
2135                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2136                                              ifp->idev->dev->name);
2137                         goto errdad;
2138                 }
2139
2140                 new_addr = ifp->addr;
2141                 if (ipv6_generate_stable_address(&new_addr, retries,
2142                                                  idev))
2143                         goto errdad;
2144
2145                 spin_unlock_bh(&ifp->lock);
2146
2147                 if (idev->cnf.max_addresses &&
2148                     ipv6_count_addresses(idev) >=
2149                     idev->cnf.max_addresses)
2150                         goto lock_errdad;
2151
2152                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2153                                      ifp->idev->dev->name);
2154
2155                 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2156                 if (IS_ERR(ifp2))
2157                         goto lock_errdad;
2158
2159                 spin_lock_bh(&ifp2->lock);
2160                 ifp2->stable_privacy_retry = retries;
2161                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2162                 spin_unlock_bh(&ifp2->lock);
2163
2164                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2165                 in6_ifa_put(ifp2);
2166 lock_errdad:
2167                 spin_lock_bh(&ifp->lock);
2168         }
2169
2170 errdad:
2171         /* transition from _POSTDAD to _ERRDAD */
2172         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2173         spin_unlock_bh(&ifp->lock);
2174
2175         addrconf_mod_dad_work(ifp, 0);
2176         in6_ifa_put(ifp);
2177 }
2178
2179 /* Join to solicited addr multicast group.
2180  * caller must hold RTNL */
2181 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2182 {
2183         struct in6_addr maddr;
2184
2185         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2186                 return;
2187
2188         addrconf_addr_solict_mult(addr, &maddr);
2189         ipv6_dev_mc_inc(dev, &maddr);
2190 }
2191
2192 /* caller must hold RTNL */
2193 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2194 {
2195         struct in6_addr maddr;
2196
2197         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2198                 return;
2199
2200         addrconf_addr_solict_mult(addr, &maddr);
2201         __ipv6_dev_mc_dec(idev, &maddr);
2202 }
2203
2204 /* caller must hold RTNL */
2205 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2206 {
2207         struct in6_addr addr;
2208
2209         if (ifp->prefix_len >= 127) /* RFC 6164 */
2210                 return;
2211         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2212         if (ipv6_addr_any(&addr))
2213                 return;
2214         __ipv6_dev_ac_inc(ifp->idev, &addr);
2215 }
2216
2217 /* caller must hold RTNL */
2218 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2219 {
2220         struct in6_addr addr;
2221
2222         if (ifp->prefix_len >= 127) /* RFC 6164 */
2223                 return;
2224         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2225         if (ipv6_addr_any(&addr))
2226                 return;
2227         __ipv6_dev_ac_dec(ifp->idev, &addr);
2228 }
2229
2230 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2231 {
2232         switch (dev->addr_len) {
2233         case ETH_ALEN:
2234                 memcpy(eui, dev->dev_addr, 3);
2235                 eui[3] = 0xFF;
2236                 eui[4] = 0xFE;
2237                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2238                 break;
2239         case EUI64_ADDR_LEN:
2240                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2241                 eui[0] ^= 2;
2242                 break;
2243         default:
2244                 return -1;
2245         }
2246
2247         return 0;
2248 }
2249
2250 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2251 {
2252         const union fwnet_hwaddr *ha;
2253
2254         if (dev->addr_len != FWNET_ALEN)
2255                 return -1;
2256
2257         ha = (const union fwnet_hwaddr *)dev->dev_addr;
2258
2259         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2260         eui[0] ^= 2;
2261         return 0;
2262 }
2263
2264 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2265 {
2266         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2267         if (dev->addr_len != ARCNET_ALEN)
2268                 return -1;
2269         memset(eui, 0, 7);
2270         eui[7] = *(u8 *)dev->dev_addr;
2271         return 0;
2272 }
2273
2274 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2275 {
2276         if (dev->addr_len != INFINIBAND_ALEN)
2277                 return -1;
2278         memcpy(eui, dev->dev_addr + 12, 8);
2279         eui[0] |= 2;
2280         return 0;
2281 }
2282
2283 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2284 {
2285         if (addr == 0)
2286                 return -1;
2287         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2288                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2289                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2290                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2291                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2292                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2293         eui[1] = 0;
2294         eui[2] = 0x5E;
2295         eui[3] = 0xFE;
2296         memcpy(eui + 4, &addr, 4);
2297         return 0;
2298 }
2299
2300 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2301 {
2302         if (dev->priv_flags & IFF_ISATAP)
2303                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2304         return -1;
2305 }
2306
2307 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2308 {
2309         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2310 }
2311
2312 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2313 {
2314         memcpy(eui, dev->perm_addr, 3);
2315         memcpy(eui + 5, dev->perm_addr + 3, 3);
2316         eui[3] = 0xFF;
2317         eui[4] = 0xFE;
2318         eui[0] ^= 2;
2319         return 0;
2320 }
2321
2322 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2323 {
2324         switch (dev->type) {
2325         case ARPHRD_ETHER:
2326         case ARPHRD_FDDI:
2327                 return addrconf_ifid_eui48(eui, dev);
2328         case ARPHRD_ARCNET:
2329                 return addrconf_ifid_arcnet(eui, dev);
2330         case ARPHRD_INFINIBAND:
2331                 return addrconf_ifid_infiniband(eui, dev);
2332         case ARPHRD_SIT:
2333                 return addrconf_ifid_sit(eui, dev);
2334         case ARPHRD_IPGRE:
2335         case ARPHRD_TUNNEL:
2336                 return addrconf_ifid_gre(eui, dev);
2337         case ARPHRD_6LOWPAN:
2338                 return addrconf_ifid_6lowpan(eui, dev);
2339         case ARPHRD_IEEE1394:
2340                 return addrconf_ifid_ieee1394(eui, dev);
2341         case ARPHRD_TUNNEL6:
2342         case ARPHRD_IP6GRE:
2343         case ARPHRD_RAWIP:
2344                 return addrconf_ifid_ip6tnl(eui, dev);
2345         }
2346         return -1;
2347 }
2348
2349 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2350 {
2351         int err = -1;
2352         struct inet6_ifaddr *ifp;
2353
2354         read_lock_bh(&idev->lock);
2355         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2356                 if (ifp->scope > IFA_LINK)
2357                         break;
2358                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2359                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2360                         err = 0;
2361                         break;
2362                 }
2363         }
2364         read_unlock_bh(&idev->lock);
2365         return err;
2366 }
2367
2368 /* Generation of a randomized Interface Identifier
2369  * draft-ietf-6man-rfc4941bis, Section 3.3.1
2370  */
2371
2372 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2373 {
2374 regen:
2375         get_random_bytes(&addr->s6_addr[8], 8);
2376
2377         /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2378          * check if generated address is not inappropriate:
2379          *
2380          * - Reserved IPv6 Interface Identifiers
2381          * - XXX: already assigned to an address on the device
2382          */
2383
2384         /* Subnet-router anycast: 0000:0000:0000:0000 */
2385         if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2386                 goto regen;
2387
2388         /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2389          * Proxy Mobile IPv6:   0200:5EFF:FE00:5213
2390          * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2391          */
2392         if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2393             (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2394                 goto regen;
2395
2396         /* Reserved subnet anycast addresses */
2397         if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2398             ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2399                 goto regen;
2400 }
2401
2402 /*
2403  *      Add prefix route.
2404  */
2405
2406 static void
2407 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2408                       struct net_device *dev, unsigned long expires,
2409                       u32 flags, gfp_t gfp_flags)
2410 {
2411         struct fib6_config cfg = {
2412                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2413                 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2414                 .fc_ifindex = dev->ifindex,
2415                 .fc_expires = expires,
2416                 .fc_dst_len = plen,
2417                 .fc_flags = RTF_UP | flags,
2418                 .fc_nlinfo.nl_net = dev_net(dev),
2419                 .fc_protocol = RTPROT_KERNEL,
2420                 .fc_type = RTN_UNICAST,
2421         };
2422
2423         cfg.fc_dst = *pfx;
2424
2425         /* Prevent useless cloning on PtP SIT.
2426            This thing is done here expecting that the whole
2427            class of non-broadcast devices need not cloning.
2428          */
2429 #if IS_ENABLED(CONFIG_IPV6_SIT)
2430         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2431                 cfg.fc_flags |= RTF_NONEXTHOP;
2432 #endif
2433
2434         ip6_route_add(&cfg, gfp_flags, NULL);
2435 }
2436
2437
2438 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2439                                                   int plen,
2440                                                   const struct net_device *dev,
2441                                                   u32 flags, u32 noflags,
2442                                                   bool no_gw)
2443 {
2444         struct fib6_node *fn;
2445         struct fib6_info *rt = NULL;
2446         struct fib6_table *table;
2447         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2448
2449         table = fib6_get_table(dev_net(dev), tb_id);
2450         if (!table)
2451                 return NULL;
2452
2453         rcu_read_lock();
2454         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2455         if (!fn)
2456                 goto out;
2457
2458         for_each_fib6_node_rt_rcu(fn) {
2459                 /* prefix routes only use builtin fib6_nh */
2460                 if (rt->nh)
2461                         continue;
2462
2463                 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2464                         continue;
2465                 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2466                         continue;
2467                 if ((rt->fib6_flags & flags) != flags)
2468                         continue;
2469                 if ((rt->fib6_flags & noflags) != 0)
2470                         continue;
2471                 if (!fib6_info_hold_safe(rt))
2472                         continue;
2473                 break;
2474         }
2475 out:
2476         rcu_read_unlock();
2477         return rt;
2478 }
2479
2480
2481 /* Create "default" multicast route to the interface */
2482
2483 static void addrconf_add_mroute(struct net_device *dev)
2484 {
2485         struct fib6_config cfg = {
2486                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2487                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2488                 .fc_ifindex = dev->ifindex,
2489                 .fc_dst_len = 8,
2490                 .fc_flags = RTF_UP,
2491                 .fc_type = RTN_MULTICAST,
2492                 .fc_nlinfo.nl_net = dev_net(dev),
2493                 .fc_protocol = RTPROT_KERNEL,
2494         };
2495
2496         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2497
2498         ip6_route_add(&cfg, GFP_KERNEL, NULL);
2499 }
2500
2501 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2502 {
2503         struct inet6_dev *idev;
2504
2505         ASSERT_RTNL();
2506
2507         idev = ipv6_find_idev(dev);
2508         if (IS_ERR(idev))
2509                 return idev;
2510
2511         if (idev->cnf.disable_ipv6)
2512                 return ERR_PTR(-EACCES);
2513
2514         /* Add default multicast route */
2515         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2516                 addrconf_add_mroute(dev);
2517
2518         return idev;
2519 }
2520
2521 static void manage_tempaddrs(struct inet6_dev *idev,
2522                              struct inet6_ifaddr *ifp,
2523                              __u32 valid_lft, __u32 prefered_lft,
2524                              bool create, unsigned long now)
2525 {
2526         u32 flags;
2527         struct inet6_ifaddr *ift;
2528
2529         read_lock_bh(&idev->lock);
2530         /* update all temporary addresses in the list */
2531         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2532                 int age, max_valid, max_prefered;
2533
2534                 if (ifp != ift->ifpub)
2535                         continue;
2536
2537                 /* RFC 4941 section 3.3:
2538                  * If a received option will extend the lifetime of a public
2539                  * address, the lifetimes of temporary addresses should
2540                  * be extended, subject to the overall constraint that no
2541                  * temporary addresses should ever remain "valid" or "preferred"
2542                  * for a time longer than (TEMP_VALID_LIFETIME) or
2543                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2544                  */
2545                 age = (now - ift->cstamp) / HZ;
2546                 max_valid = idev->cnf.temp_valid_lft - age;
2547                 if (max_valid < 0)
2548                         max_valid = 0;
2549
2550                 max_prefered = idev->cnf.temp_prefered_lft -
2551                                idev->desync_factor - age;
2552                 if (max_prefered < 0)
2553                         max_prefered = 0;
2554
2555                 if (valid_lft > max_valid)
2556                         valid_lft = max_valid;
2557
2558                 if (prefered_lft > max_prefered)
2559                         prefered_lft = max_prefered;
2560
2561                 spin_lock(&ift->lock);
2562                 flags = ift->flags;
2563                 ift->valid_lft = valid_lft;
2564                 ift->prefered_lft = prefered_lft;
2565                 ift->tstamp = now;
2566                 if (prefered_lft > 0)
2567                         ift->flags &= ~IFA_F_DEPRECATED;
2568
2569                 spin_unlock(&ift->lock);
2570                 if (!(flags&IFA_F_TENTATIVE))
2571                         ipv6_ifa_notify(0, ift);
2572         }
2573
2574         /* Also create a temporary address if it's enabled but no temporary
2575          * address currently exists.
2576          * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2577          * as part of cleanup (ie. deleting the mngtmpaddr).
2578          * We don't want that to result in creating a new temporary ip address.
2579          */
2580         if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2581                 create = true;
2582
2583         if (create && idev->cnf.use_tempaddr > 0) {
2584                 /* When a new public address is created as described
2585                  * in [ADDRCONF], also create a new temporary address.
2586                  */
2587                 read_unlock_bh(&idev->lock);
2588                 ipv6_create_tempaddr(ifp, false);
2589         } else {
2590                 read_unlock_bh(&idev->lock);
2591         }
2592 }
2593
2594 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2595 {
2596         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2597                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2598 }
2599
2600 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2601                                  const struct prefix_info *pinfo,
2602                                  struct inet6_dev *in6_dev,
2603                                  const struct in6_addr *addr, int addr_type,
2604                                  u32 addr_flags, bool sllao, bool tokenized,
2605                                  __u32 valid_lft, u32 prefered_lft)
2606 {
2607         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2608         int create = 0, update_lft = 0;
2609
2610         if (!ifp && valid_lft) {
2611                 int max_addresses = in6_dev->cnf.max_addresses;
2612                 struct ifa6_config cfg = {
2613                         .pfx = addr,
2614                         .plen = pinfo->prefix_len,
2615                         .ifa_flags = addr_flags,
2616                         .valid_lft = valid_lft,
2617                         .preferred_lft = prefered_lft,
2618                         .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2619                         .ifa_proto = IFAPROT_KERNEL_RA
2620                 };
2621
2622 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2623                 if ((net->ipv6.devconf_all->optimistic_dad ||
2624                      in6_dev->cnf.optimistic_dad) &&
2625                     !net->ipv6.devconf_all->forwarding && sllao)
2626                         cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2627 #endif
2628
2629                 /* Do not allow to create too much of autoconfigured
2630                  * addresses; this would be too easy way to crash kernel.
2631                  */
2632                 if (!max_addresses ||
2633                     ipv6_count_addresses(in6_dev) < max_addresses)
2634                         ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2635
2636                 if (IS_ERR_OR_NULL(ifp))
2637                         return -1;
2638
2639                 create = 1;
2640                 spin_lock_bh(&ifp->lock);
2641                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2642                 ifp->cstamp = jiffies;
2643                 ifp->tokenized = tokenized;
2644                 spin_unlock_bh(&ifp->lock);
2645                 addrconf_dad_start(ifp);
2646         }
2647
2648         if (ifp) {
2649                 u32 flags;
2650                 unsigned long now;
2651                 u32 stored_lft;
2652
2653                 /* update lifetime (RFC2462 5.5.3 e) */
2654                 spin_lock_bh(&ifp->lock);
2655                 now = jiffies;
2656                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2657                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2658                 else
2659                         stored_lft = 0;
2660                 if (!create && stored_lft) {
2661                         const u32 minimum_lft = min_t(u32,
2662                                 stored_lft, MIN_VALID_LIFETIME);
2663                         valid_lft = max(valid_lft, minimum_lft);
2664
2665                         /* RFC4862 Section 5.5.3e:
2666                          * "Note that the preferred lifetime of the
2667                          *  corresponding address is always reset to
2668                          *  the Preferred Lifetime in the received
2669                          *  Prefix Information option, regardless of
2670                          *  whether the valid lifetime is also reset or
2671                          *  ignored."
2672                          *
2673                          * So we should always update prefered_lft here.
2674                          */
2675                         update_lft = 1;
2676                 }
2677
2678                 if (update_lft) {
2679                         ifp->valid_lft = valid_lft;
2680                         ifp->prefered_lft = prefered_lft;
2681                         ifp->tstamp = now;
2682                         flags = ifp->flags;
2683                         ifp->flags &= ~IFA_F_DEPRECATED;
2684                         spin_unlock_bh(&ifp->lock);
2685
2686                         if (!(flags&IFA_F_TENTATIVE))
2687                                 ipv6_ifa_notify(0, ifp);
2688                 } else
2689                         spin_unlock_bh(&ifp->lock);
2690
2691                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2692                                  create, now);
2693
2694                 in6_ifa_put(ifp);
2695                 addrconf_verify(net);
2696         }
2697
2698         return 0;
2699 }
2700 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2701
2702 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2703 {
2704         struct prefix_info *pinfo;
2705         __u32 valid_lft;
2706         __u32 prefered_lft;
2707         int addr_type, err;
2708         u32 addr_flags = 0;
2709         struct inet6_dev *in6_dev;
2710         struct net *net = dev_net(dev);
2711
2712         pinfo = (struct prefix_info *) opt;
2713
2714         if (len < sizeof(struct prefix_info)) {
2715                 netdev_dbg(dev, "addrconf: prefix option too short\n");
2716                 return;
2717         }
2718
2719         /*
2720          *      Validation checks ([ADDRCONF], page 19)
2721          */
2722
2723         addr_type = ipv6_addr_type(&pinfo->prefix);
2724
2725         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2726                 return;
2727
2728         valid_lft = ntohl(pinfo->valid);
2729         prefered_lft = ntohl(pinfo->prefered);
2730
2731         if (prefered_lft > valid_lft) {
2732                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2733                 return;
2734         }
2735
2736         in6_dev = in6_dev_get(dev);
2737
2738         if (!in6_dev) {
2739                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2740                                     dev->name);
2741                 return;
2742         }
2743
2744         if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2745                 goto put;
2746
2747         /*
2748          *      Two things going on here:
2749          *      1) Add routes for on-link prefixes
2750          *      2) Configure prefixes with the auto flag set
2751          */
2752
2753         if (pinfo->onlink) {
2754                 struct fib6_info *rt;
2755                 unsigned long rt_expires;
2756
2757                 /* Avoid arithmetic overflow. Really, we could
2758                  * save rt_expires in seconds, likely valid_lft,
2759                  * but it would require division in fib gc, that it
2760                  * not good.
2761                  */
2762                 if (HZ > USER_HZ)
2763                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2764                 else
2765                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2766
2767                 if (addrconf_finite_timeout(rt_expires))
2768                         rt_expires *= HZ;
2769
2770                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2771                                                pinfo->prefix_len,
2772                                                dev,
2773                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2774                                                RTF_DEFAULT, true);
2775
2776                 if (rt) {
2777                         /* Autoconf prefix route */
2778                         if (valid_lft == 0) {
2779                                 ip6_del_rt(net, rt, false);
2780                                 rt = NULL;
2781                         } else if (addrconf_finite_timeout(rt_expires)) {
2782                                 /* not infinity */
2783                                 fib6_set_expires(rt, jiffies + rt_expires);
2784                         } else {
2785                                 fib6_clean_expires(rt);
2786                         }
2787                 } else if (valid_lft) {
2788                         clock_t expires = 0;
2789                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2790                         if (addrconf_finite_timeout(rt_expires)) {
2791                                 /* not infinity */
2792                                 flags |= RTF_EXPIRES;
2793                                 expires = jiffies_to_clock_t(rt_expires);
2794                         }
2795                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2796                                               0, dev, expires, flags,
2797                                               GFP_ATOMIC);
2798                 }
2799                 fib6_info_release(rt);
2800         }
2801
2802         /* Try to figure out our local address for this prefix */
2803
2804         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2805                 struct in6_addr addr;
2806                 bool tokenized = false, dev_addr_generated = false;
2807
2808                 if (pinfo->prefix_len == 64) {
2809                         memcpy(&addr, &pinfo->prefix, 8);
2810
2811                         if (!ipv6_addr_any(&in6_dev->token)) {
2812                                 read_lock_bh(&in6_dev->lock);
2813                                 memcpy(addr.s6_addr + 8,
2814                                        in6_dev->token.s6_addr + 8, 8);
2815                                 read_unlock_bh(&in6_dev->lock);
2816                                 tokenized = true;
2817                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2818                                    !ipv6_generate_stable_address(&addr, 0,
2819                                                                  in6_dev)) {
2820                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2821                                 goto ok;
2822                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2823                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2824                                 goto put;
2825                         } else {
2826                                 dev_addr_generated = true;
2827                         }
2828                         goto ok;
2829                 }
2830                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2831                                     pinfo->prefix_len);
2832                 goto put;
2833
2834 ok:
2835                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2836                                                    &addr, addr_type,
2837                                                    addr_flags, sllao,
2838                                                    tokenized, valid_lft,
2839                                                    prefered_lft);
2840                 if (err)
2841                         goto put;
2842
2843                 /* Ignore error case here because previous prefix add addr was
2844                  * successful which will be notified.
2845                  */
2846                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2847                                               addr_type, addr_flags, sllao,
2848                                               tokenized, valid_lft,
2849                                               prefered_lft,
2850                                               dev_addr_generated);
2851         }
2852         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2853 put:
2854         in6_dev_put(in6_dev);
2855 }
2856
2857 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2858                 struct in6_ifreq *ireq)
2859 {
2860         struct ip_tunnel_parm p = { };
2861         int err;
2862
2863         if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2864                 return -EADDRNOTAVAIL;
2865
2866         p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2867         p.iph.version = 4;
2868         p.iph.ihl = 5;
2869         p.iph.protocol = IPPROTO_IPV6;
2870         p.iph.ttl = 64;
2871
2872         if (!dev->netdev_ops->ndo_tunnel_ctl)
2873                 return -EOPNOTSUPP;
2874         err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2875         if (err)
2876                 return err;
2877
2878         dev = __dev_get_by_name(net, p.name);
2879         if (!dev)
2880                 return -ENOBUFS;
2881         return dev_open(dev, NULL);
2882 }
2883
2884 /*
2885  *      Set destination address.
2886  *      Special case for SIT interfaces where we create a new "virtual"
2887  *      device.
2888  */
2889 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2890 {
2891         struct net_device *dev;
2892         struct in6_ifreq ireq;
2893         int err = -ENODEV;
2894
2895         if (!IS_ENABLED(CONFIG_IPV6_SIT))
2896                 return -ENODEV;
2897         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2898                 return -EFAULT;
2899
2900         rtnl_lock();
2901         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2902         if (dev && dev->type == ARPHRD_SIT)
2903                 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2904         rtnl_unlock();
2905         return err;
2906 }
2907
2908 static int ipv6_mc_config(struct sock *sk, bool join,
2909                           const struct in6_addr *addr, int ifindex)
2910 {
2911         int ret;
2912
2913         ASSERT_RTNL();
2914
2915         lock_sock(sk);
2916         if (join)
2917                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2918         else
2919                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2920         release_sock(sk);
2921
2922         return ret;
2923 }
2924
2925 /*
2926  *      Manual configuration of address on an interface
2927  */
2928 static int inet6_addr_add(struct net *net, int ifindex,
2929                           struct ifa6_config *cfg,
2930                           struct netlink_ext_ack *extack)
2931 {
2932         struct inet6_ifaddr *ifp;
2933         struct inet6_dev *idev;
2934         struct net_device *dev;
2935         unsigned long timeout;
2936         clock_t expires;
2937         u32 flags;
2938
2939         ASSERT_RTNL();
2940
2941         if (cfg->plen > 128) {
2942                 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
2943                 return -EINVAL;
2944         }
2945
2946         /* check the lifetime */
2947         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
2948                 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
2949                 return -EINVAL;
2950         }
2951
2952         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
2953                 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
2954                 return -EINVAL;
2955         }
2956
2957         dev = __dev_get_by_index(net, ifindex);
2958         if (!dev)
2959                 return -ENODEV;
2960
2961         idev = addrconf_add_dev(dev);
2962         if (IS_ERR(idev)) {
2963                 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
2964                 return PTR_ERR(idev);
2965         }
2966
2967         if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2968                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2969                                          true, cfg->pfx, ifindex);
2970
2971                 if (ret < 0) {
2972                         NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
2973                         return ret;
2974                 }
2975         }
2976
2977         cfg->scope = ipv6_addr_scope(cfg->pfx);
2978
2979         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2980         if (addrconf_finite_timeout(timeout)) {
2981                 expires = jiffies_to_clock_t(timeout * HZ);
2982                 cfg->valid_lft = timeout;
2983                 flags = RTF_EXPIRES;
2984         } else {
2985                 expires = 0;
2986                 flags = 0;
2987                 cfg->ifa_flags |= IFA_F_PERMANENT;
2988         }
2989
2990         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2991         if (addrconf_finite_timeout(timeout)) {
2992                 if (timeout == 0)
2993                         cfg->ifa_flags |= IFA_F_DEPRECATED;
2994                 cfg->preferred_lft = timeout;
2995         }
2996
2997         ifp = ipv6_add_addr(idev, cfg, true, extack);
2998         if (!IS_ERR(ifp)) {
2999                 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3000                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3001                                               ifp->rt_priority, dev, expires,
3002                                               flags, GFP_KERNEL);
3003                 }
3004
3005                 /* Send a netlink notification if DAD is enabled and
3006                  * optimistic flag is not set
3007                  */
3008                 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3009                         ipv6_ifa_notify(0, ifp);
3010                 /*
3011                  * Note that section 3.1 of RFC 4429 indicates
3012                  * that the Optimistic flag should not be set for
3013                  * manually configured addresses
3014                  */
3015                 addrconf_dad_start(ifp);
3016                 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3017                         manage_tempaddrs(idev, ifp, cfg->valid_lft,
3018                                          cfg->preferred_lft, true, jiffies);
3019                 in6_ifa_put(ifp);
3020                 addrconf_verify_rtnl(net);
3021                 return 0;
3022         } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3023                 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3024                                cfg->pfx, ifindex);
3025         }
3026
3027         return PTR_ERR(ifp);
3028 }
3029
3030 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3031                           const struct in6_addr *pfx, unsigned int plen,
3032                           struct netlink_ext_ack *extack)
3033 {
3034         struct inet6_ifaddr *ifp;
3035         struct inet6_dev *idev;
3036         struct net_device *dev;
3037
3038         if (plen > 128) {
3039                 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3040                 return -EINVAL;
3041         }
3042
3043         dev = __dev_get_by_index(net, ifindex);
3044         if (!dev) {
3045                 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3046                 return -ENODEV;
3047         }
3048
3049         idev = __in6_dev_get(dev);
3050         if (!idev) {
3051                 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3052                 return -ENXIO;
3053         }
3054
3055         read_lock_bh(&idev->lock);
3056         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3057                 if (ifp->prefix_len == plen &&
3058                     ipv6_addr_equal(pfx, &ifp->addr)) {
3059                         in6_ifa_hold(ifp);
3060                         read_unlock_bh(&idev->lock);
3061
3062                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
3063                             (ifa_flags & IFA_F_MANAGETEMPADDR))
3064                                 manage_tempaddrs(idev, ifp, 0, 0, false,
3065                                                  jiffies);
3066                         ipv6_del_addr(ifp);
3067                         addrconf_verify_rtnl(net);
3068                         if (ipv6_addr_is_multicast(pfx)) {
3069                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3070                                                false, pfx, dev->ifindex);
3071                         }
3072                         return 0;
3073                 }
3074         }
3075         read_unlock_bh(&idev->lock);
3076
3077         NL_SET_ERR_MSG_MOD(extack, "address not found");
3078         return -EADDRNOTAVAIL;
3079 }
3080
3081
3082 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3083 {
3084         struct ifa6_config cfg = {
3085                 .ifa_flags = IFA_F_PERMANENT,
3086                 .preferred_lft = INFINITY_LIFE_TIME,
3087                 .valid_lft = INFINITY_LIFE_TIME,
3088         };
3089         struct in6_ifreq ireq;
3090         int err;
3091
3092         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3093                 return -EPERM;
3094
3095         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3096                 return -EFAULT;
3097
3098         cfg.pfx = &ireq.ifr6_addr;
3099         cfg.plen = ireq.ifr6_prefixlen;
3100
3101         rtnl_lock();
3102         err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3103         rtnl_unlock();
3104         return err;
3105 }
3106
3107 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3108 {
3109         struct in6_ifreq ireq;
3110         int err;
3111
3112         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3113                 return -EPERM;
3114
3115         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3116                 return -EFAULT;
3117
3118         rtnl_lock();
3119         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3120                              ireq.ifr6_prefixlen, NULL);
3121         rtnl_unlock();
3122         return err;
3123 }
3124
3125 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3126                      int plen, int scope, u8 proto)
3127 {
3128         struct inet6_ifaddr *ifp;
3129         struct ifa6_config cfg = {
3130                 .pfx = addr,
3131                 .plen = plen,
3132                 .ifa_flags = IFA_F_PERMANENT,
3133                 .valid_lft = INFINITY_LIFE_TIME,
3134                 .preferred_lft = INFINITY_LIFE_TIME,
3135                 .scope = scope,
3136                 .ifa_proto = proto
3137         };
3138
3139         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3140         if (!IS_ERR(ifp)) {
3141                 spin_lock_bh(&ifp->lock);
3142                 ifp->flags &= ~IFA_F_TENTATIVE;
3143                 spin_unlock_bh(&ifp->lock);
3144                 rt_genid_bump_ipv6(dev_net(idev->dev));
3145                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3146                 in6_ifa_put(ifp);
3147         }
3148 }
3149
3150 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3151 static void add_v4_addrs(struct inet6_dev *idev)
3152 {
3153         struct in6_addr addr;
3154         struct net_device *dev;
3155         struct net *net = dev_net(idev->dev);
3156         int scope, plen, offset = 0;
3157         u32 pflags = 0;
3158
3159         ASSERT_RTNL();
3160
3161         memset(&addr, 0, sizeof(struct in6_addr));
3162         /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3163         if (idev->dev->addr_len == sizeof(struct in6_addr))
3164                 offset = sizeof(struct in6_addr) - 4;
3165         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3166
3167         if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3168                 scope = IPV6_ADDR_COMPATv4;
3169                 plen = 96;
3170                 pflags |= RTF_NONEXTHOP;
3171         } else {
3172                 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3173                         return;
3174
3175                 addr.s6_addr32[0] = htonl(0xfe800000);
3176                 scope = IFA_LINK;
3177                 plen = 64;
3178         }
3179
3180         if (addr.s6_addr32[3]) {
3181                 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3182                 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3183                                       GFP_KERNEL);
3184                 return;
3185         }
3186
3187         for_each_netdev(net, dev) {
3188                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3189                 if (in_dev && (dev->flags & IFF_UP)) {
3190                         struct in_ifaddr *ifa;
3191                         int flag = scope;
3192
3193                         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3194                                 addr.s6_addr32[3] = ifa->ifa_local;
3195
3196                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3197                                         continue;
3198                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3199                                         if (idev->dev->flags&IFF_POINTOPOINT)
3200                                                 continue;
3201                                         flag |= IFA_HOST;
3202                                 }
3203
3204                                 add_addr(idev, &addr, plen, flag,
3205                                          IFAPROT_UNSPEC);
3206                                 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3207                                                       0, pflags, GFP_KERNEL);
3208                         }
3209                 }
3210         }
3211 }
3212 #endif
3213
3214 static void init_loopback(struct net_device *dev)
3215 {
3216         struct inet6_dev  *idev;
3217
3218         /* ::1 */
3219
3220         ASSERT_RTNL();
3221
3222         idev = ipv6_find_idev(dev);
3223         if (IS_ERR(idev)) {
3224                 pr_debug("%s: add_dev failed\n", __func__);
3225                 return;
3226         }
3227
3228         add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3229 }
3230
3231 void addrconf_add_linklocal(struct inet6_dev *idev,
3232                             const struct in6_addr *addr, u32 flags)
3233 {
3234         struct ifa6_config cfg = {
3235                 .pfx = addr,
3236                 .plen = 64,
3237                 .ifa_flags = flags | IFA_F_PERMANENT,
3238                 .valid_lft = INFINITY_LIFE_TIME,
3239                 .preferred_lft = INFINITY_LIFE_TIME,
3240                 .scope = IFA_LINK,
3241                 .ifa_proto = IFAPROT_KERNEL_LL
3242         };
3243         struct inet6_ifaddr *ifp;
3244
3245 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3246         if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3247              idev->cnf.optimistic_dad) &&
3248             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3249                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3250 #endif
3251
3252         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3253         if (!IS_ERR(ifp)) {
3254                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3255                                       0, 0, GFP_ATOMIC);
3256                 addrconf_dad_start(ifp);
3257                 in6_ifa_put(ifp);
3258         }
3259 }
3260 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3261
3262 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3263 {
3264         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3265                 return true;
3266
3267         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3268             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3269                 return true;
3270
3271         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3272             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3273                 return true;
3274
3275         return false;
3276 }
3277
3278 static int ipv6_generate_stable_address(struct in6_addr *address,
3279                                         u8 dad_count,
3280                                         const struct inet6_dev *idev)
3281 {
3282         static DEFINE_SPINLOCK(lock);
3283         static __u32 digest[SHA1_DIGEST_WORDS];
3284         static __u32 workspace[SHA1_WORKSPACE_WORDS];
3285
3286         static union {
3287                 char __data[SHA1_BLOCK_SIZE];
3288                 struct {
3289                         struct in6_addr secret;
3290                         __be32 prefix[2];
3291                         unsigned char hwaddr[MAX_ADDR_LEN];
3292                         u8 dad_count;
3293                 } __packed;
3294         } data;
3295
3296         struct in6_addr secret;
3297         struct in6_addr temp;
3298         struct net *net = dev_net(idev->dev);
3299
3300         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3301
3302         if (idev->cnf.stable_secret.initialized)
3303                 secret = idev->cnf.stable_secret.secret;
3304         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3305                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3306         else
3307                 return -1;
3308
3309 retry:
3310         spin_lock_bh(&lock);
3311
3312         sha1_init(digest);
3313         memset(&data, 0, sizeof(data));
3314         memset(workspace, 0, sizeof(workspace));
3315         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3316         data.prefix[0] = address->s6_addr32[0];
3317         data.prefix[1] = address->s6_addr32[1];
3318         data.secret = secret;
3319         data.dad_count = dad_count;
3320
3321         sha1_transform(digest, data.__data, workspace);
3322
3323         temp = *address;
3324         temp.s6_addr32[2] = (__force __be32)digest[0];
3325         temp.s6_addr32[3] = (__force __be32)digest[1];
3326
3327         spin_unlock_bh(&lock);
3328
3329         if (ipv6_reserved_interfaceid(temp)) {
3330                 dad_count++;
3331                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3332                         return -1;
3333                 goto retry;
3334         }
3335
3336         *address = temp;
3337         return 0;
3338 }
3339
3340 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3341 {
3342         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3343
3344         if (s->initialized)
3345                 return;
3346         s = &idev->cnf.stable_secret;
3347         get_random_bytes(&s->secret, sizeof(s->secret));
3348         s->initialized = true;
3349 }
3350
3351 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3352 {
3353         struct in6_addr addr;
3354
3355         /* no link local addresses on L3 master devices */
3356         if (netif_is_l3_master(idev->dev))
3357                 return;
3358
3359         /* no link local addresses on devices flagged as slaves */
3360         if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3361                 return;
3362
3363         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3364
3365         switch (idev->cnf.addr_gen_mode) {
3366         case IN6_ADDR_GEN_MODE_RANDOM:
3367                 ipv6_gen_mode_random_init(idev);
3368                 fallthrough;
3369         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3370                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3371                         addrconf_add_linklocal(idev, &addr,
3372                                                IFA_F_STABLE_PRIVACY);
3373                 else if (prefix_route)
3374                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3375                                               0, 0, GFP_KERNEL);
3376                 break;
3377         case IN6_ADDR_GEN_MODE_EUI64:
3378                 /* addrconf_add_linklocal also adds a prefix_route and we
3379                  * only need to care about prefix routes if ipv6_generate_eui64
3380                  * couldn't generate one.
3381                  */
3382                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3383                         addrconf_add_linklocal(idev, &addr, 0);
3384                 else if (prefix_route)
3385                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3386                                               0, 0, GFP_KERNEL);
3387                 break;
3388         case IN6_ADDR_GEN_MODE_NONE:
3389         default:
3390                 /* will not add any link local address */
3391                 break;
3392         }
3393 }
3394
3395 static void addrconf_dev_config(struct net_device *dev)
3396 {
3397         struct inet6_dev *idev;
3398
3399         ASSERT_RTNL();
3400
3401         if ((dev->type != ARPHRD_ETHER) &&
3402             (dev->type != ARPHRD_FDDI) &&
3403             (dev->type != ARPHRD_ARCNET) &&
3404             (dev->type != ARPHRD_INFINIBAND) &&
3405             (dev->type != ARPHRD_IEEE1394) &&
3406             (dev->type != ARPHRD_TUNNEL6) &&
3407             (dev->type != ARPHRD_6LOWPAN) &&
3408             (dev->type != ARPHRD_TUNNEL) &&
3409             (dev->type != ARPHRD_NONE) &&
3410             (dev->type != ARPHRD_RAWIP)) {
3411                 /* Alas, we support only Ethernet autoconfiguration. */
3412                 idev = __in6_dev_get(dev);
3413                 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3414                     dev->flags & IFF_MULTICAST)
3415                         ipv6_mc_up(idev);
3416                 return;
3417         }
3418
3419         idev = addrconf_add_dev(dev);
3420         if (IS_ERR(idev))
3421                 return;
3422
3423         /* this device type has no EUI support */
3424         if (dev->type == ARPHRD_NONE &&
3425             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3426                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3427
3428         addrconf_addr_gen(idev, false);
3429 }
3430
3431 #if IS_ENABLED(CONFIG_IPV6_SIT)
3432 static void addrconf_sit_config(struct net_device *dev)
3433 {
3434         struct inet6_dev *idev;
3435
3436         ASSERT_RTNL();
3437
3438         /*
3439          * Configure the tunnel with one of our IPv4
3440          * addresses... we should configure all of
3441          * our v4 addrs in the tunnel
3442          */
3443
3444         idev = ipv6_find_idev(dev);
3445         if (IS_ERR(idev)) {
3446                 pr_debug("%s: add_dev failed\n", __func__);
3447                 return;
3448         }
3449
3450         if (dev->priv_flags & IFF_ISATAP) {
3451                 addrconf_addr_gen(idev, false);
3452                 return;
3453         }
3454
3455         add_v4_addrs(idev);
3456
3457         if (dev->flags&IFF_POINTOPOINT)
3458                 addrconf_add_mroute(dev);
3459 }
3460 #endif
3461
3462 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3463 static void addrconf_gre_config(struct net_device *dev)
3464 {
3465         struct inet6_dev *idev;
3466
3467         ASSERT_RTNL();
3468
3469         idev = ipv6_find_idev(dev);
3470         if (IS_ERR(idev)) {
3471                 pr_debug("%s: add_dev failed\n", __func__);
3472                 return;
3473         }
3474
3475         if (dev->type == ARPHRD_ETHER) {
3476                 addrconf_addr_gen(idev, true);
3477                 return;
3478         }
3479
3480         add_v4_addrs(idev);
3481
3482         if (dev->flags & IFF_POINTOPOINT)
3483                 addrconf_add_mroute(dev);
3484 }
3485 #endif
3486
3487 static void addrconf_init_auto_addrs(struct net_device *dev)
3488 {
3489         switch (dev->type) {
3490 #if IS_ENABLED(CONFIG_IPV6_SIT)
3491         case ARPHRD_SIT:
3492                 addrconf_sit_config(dev);
3493                 break;
3494 #endif
3495 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3496         case ARPHRD_IP6GRE:
3497         case ARPHRD_IPGRE:
3498                 addrconf_gre_config(dev);
3499                 break;
3500 #endif
3501         case ARPHRD_LOOPBACK:
3502                 init_loopback(dev);
3503                 break;
3504
3505         default:
3506                 addrconf_dev_config(dev);
3507                 break;
3508         }
3509 }
3510
3511 static int fixup_permanent_addr(struct net *net,
3512                                 struct inet6_dev *idev,
3513                                 struct inet6_ifaddr *ifp)
3514 {
3515         /* !fib6_node means the host route was removed from the
3516          * FIB, for example, if 'lo' device is taken down. In that
3517          * case regenerate the host route.
3518          */
3519         if (!ifp->rt || !ifp->rt->fib6_node) {
3520                 struct fib6_info *f6i, *prev;
3521
3522                 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3523                                          GFP_ATOMIC, NULL);
3524                 if (IS_ERR(f6i))
3525                         return PTR_ERR(f6i);
3526
3527                 /* ifp->rt can be accessed outside of rtnl */
3528                 spin_lock(&ifp->lock);
3529                 prev = ifp->rt;
3530                 ifp->rt = f6i;
3531                 spin_unlock(&ifp->lock);
3532
3533                 fib6_info_release(prev);
3534         }
3535
3536         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3537                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3538                                       ifp->rt_priority, idev->dev, 0, 0,
3539                                       GFP_ATOMIC);
3540         }
3541
3542         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3543                 addrconf_dad_start(ifp);
3544
3545         return 0;
3546 }
3547
3548 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3549 {
3550         struct inet6_ifaddr *ifp, *tmp;
3551         struct inet6_dev *idev;
3552
3553         idev = __in6_dev_get(dev);
3554         if (!idev)
3555                 return;
3556
3557         write_lock_bh(&idev->lock);
3558
3559         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3560                 if ((ifp->flags & IFA_F_PERMANENT) &&
3561                     fixup_permanent_addr(net, idev, ifp) < 0) {
3562                         write_unlock_bh(&idev->lock);
3563                         in6_ifa_hold(ifp);
3564                         ipv6_del_addr(ifp);
3565                         write_lock_bh(&idev->lock);
3566
3567                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3568                                              idev->dev->name, &ifp->addr);
3569                 }
3570         }
3571
3572         write_unlock_bh(&idev->lock);
3573 }
3574
3575 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3576                            void *ptr)
3577 {
3578         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3579         struct netdev_notifier_change_info *change_info;
3580         struct netdev_notifier_changeupper_info *info;
3581         struct inet6_dev *idev = __in6_dev_get(dev);
3582         struct net *net = dev_net(dev);
3583         int run_pending = 0;
3584         int err;
3585
3586         switch (event) {
3587         case NETDEV_REGISTER:
3588                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3589                         idev = ipv6_add_dev(dev);
3590                         if (IS_ERR(idev))
3591                                 return notifier_from_errno(PTR_ERR(idev));
3592                 }
3593                 break;
3594
3595         case NETDEV_CHANGEMTU:
3596                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3597                 if (dev->mtu < IPV6_MIN_MTU) {
3598                         addrconf_ifdown(dev, dev != net->loopback_dev);
3599                         break;
3600                 }
3601
3602                 if (idev) {
3603                         rt6_mtu_change(dev, dev->mtu);
3604                         idev->cnf.mtu6 = dev->mtu;
3605                         break;
3606                 }
3607
3608                 /* allocate new idev */
3609                 idev = ipv6_add_dev(dev);
3610                 if (IS_ERR(idev))
3611                         break;
3612
3613                 /* device is still not ready */
3614                 if (!(idev->if_flags & IF_READY))
3615                         break;
3616
3617                 run_pending = 1;
3618                 fallthrough;
3619         case NETDEV_UP:
3620         case NETDEV_CHANGE:
3621                 if (idev && idev->cnf.disable_ipv6)
3622                         break;
3623
3624                 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3625                         if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3626                             dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3627                                 ipv6_mc_up(idev);
3628                         break;
3629                 }
3630
3631                 if (event == NETDEV_UP) {
3632                         /* restore routes for permanent addresses */
3633                         addrconf_permanent_addr(net, dev);
3634
3635                         if (!addrconf_link_ready(dev)) {
3636                                 /* device is not ready yet. */
3637                                 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3638                                          dev->name);
3639                                 break;
3640                         }
3641
3642                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3643                                 idev = ipv6_add_dev(dev);
3644
3645                         if (!IS_ERR_OR_NULL(idev)) {
3646                                 idev->if_flags |= IF_READY;
3647                                 run_pending = 1;
3648                         }
3649                 } else if (event == NETDEV_CHANGE) {
3650                         if (!addrconf_link_ready(dev)) {
3651                                 /* device is still not ready. */
3652                                 rt6_sync_down_dev(dev, event);
3653                                 break;
3654                         }
3655
3656                         if (!IS_ERR_OR_NULL(idev)) {
3657                                 if (idev->if_flags & IF_READY) {
3658                                         /* device is already configured -
3659                                          * but resend MLD reports, we might
3660                                          * have roamed and need to update
3661                                          * multicast snooping switches
3662                                          */
3663                                         ipv6_mc_up(idev);
3664                                         change_info = ptr;
3665                                         if (change_info->flags_changed & IFF_NOARP)
3666                                                 addrconf_dad_run(idev, true);
3667                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
3668                                         break;
3669                                 }
3670                                 idev->if_flags |= IF_READY;
3671                         }
3672
3673                         pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3674                                  dev->name);
3675
3676                         run_pending = 1;
3677                 }
3678
3679                 addrconf_init_auto_addrs(dev);
3680
3681                 if (!IS_ERR_OR_NULL(idev)) {
3682                         if (run_pending)
3683                                 addrconf_dad_run(idev, false);
3684
3685                         /* Device has an address by now */
3686                         rt6_sync_up(dev, RTNH_F_DEAD);
3687
3688                         /*
3689                          * If the MTU changed during the interface down,
3690                          * when the interface up, the changed MTU must be
3691                          * reflected in the idev as well as routers.
3692                          */
3693                         if (idev->cnf.mtu6 != dev->mtu &&
3694                             dev->mtu >= IPV6_MIN_MTU) {
3695                                 rt6_mtu_change(dev, dev->mtu);
3696                                 idev->cnf.mtu6 = dev->mtu;
3697                         }
3698                         idev->tstamp = jiffies;
3699                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3700
3701                         /*
3702                          * If the changed mtu during down is lower than
3703                          * IPV6_MIN_MTU stop IPv6 on this interface.
3704                          */
3705                         if (dev->mtu < IPV6_MIN_MTU)
3706                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3707                 }
3708                 break;
3709
3710         case NETDEV_DOWN:
3711         case NETDEV_UNREGISTER:
3712                 /*
3713                  *      Remove all addresses from this interface.
3714                  */
3715                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3716                 break;
3717
3718         case NETDEV_CHANGENAME:
3719                 if (idev) {
3720                         snmp6_unregister_dev(idev);
3721                         addrconf_sysctl_unregister(idev);
3722                         err = addrconf_sysctl_register(idev);
3723                         if (err)
3724                                 return notifier_from_errno(err);
3725                         err = snmp6_register_dev(idev);
3726                         if (err) {
3727                                 addrconf_sysctl_unregister(idev);
3728                                 return notifier_from_errno(err);
3729                         }
3730                 }
3731                 break;
3732
3733         case NETDEV_PRE_TYPE_CHANGE:
3734         case NETDEV_POST_TYPE_CHANGE:
3735                 if (idev)
3736                         addrconf_type_change(dev, event);
3737                 break;
3738
3739         case NETDEV_CHANGEUPPER:
3740                 info = ptr;
3741
3742                 /* flush all routes if dev is linked to or unlinked from
3743                  * an L3 master device (e.g., VRF)
3744                  */
3745                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3746                         addrconf_ifdown(dev, false);
3747         }
3748
3749         return NOTIFY_OK;
3750 }
3751
3752 /*
3753  *      addrconf module should be notified of a device going up
3754  */
3755 static struct notifier_block ipv6_dev_notf = {
3756         .notifier_call = addrconf_notify,
3757         .priority = ADDRCONF_NOTIFY_PRIORITY,
3758 };
3759
3760 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3761 {
3762         struct inet6_dev *idev;
3763         ASSERT_RTNL();
3764
3765         idev = __in6_dev_get(dev);
3766
3767         if (event == NETDEV_POST_TYPE_CHANGE)
3768                 ipv6_mc_remap(idev);
3769         else if (event == NETDEV_PRE_TYPE_CHANGE)
3770                 ipv6_mc_unmap(idev);
3771 }
3772
3773 static bool addr_is_local(const struct in6_addr *addr)
3774 {
3775         return ipv6_addr_type(addr) &
3776                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3777 }
3778
3779 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3780 {
3781         unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3782         struct net *net = dev_net(dev);
3783         struct inet6_dev *idev;
3784         struct inet6_ifaddr *ifa;
3785         LIST_HEAD(tmp_addr_list);
3786         bool keep_addr = false;
3787         bool was_ready;
3788         int state, i;
3789
3790         ASSERT_RTNL();
3791
3792         rt6_disable_ip(dev, event);
3793
3794         idev = __in6_dev_get(dev);
3795         if (!idev)
3796                 return -ENODEV;
3797
3798         /*
3799          * Step 1: remove reference to ipv6 device from parent device.
3800          *         Do not dev_put!
3801          */
3802         if (unregister) {
3803                 idev->dead = 1;
3804
3805                 /* protected by rtnl_lock */
3806                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3807
3808                 /* Step 1.5: remove snmp6 entry */
3809                 snmp6_unregister_dev(idev);
3810
3811         }
3812
3813         /* combine the user config with event to determine if permanent
3814          * addresses are to be removed from address hash table
3815          */
3816         if (!unregister && !idev->cnf.disable_ipv6) {
3817                 /* aggregate the system setting and interface setting */
3818                 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3819
3820                 if (!_keep_addr)
3821                         _keep_addr = idev->cnf.keep_addr_on_down;
3822
3823                 keep_addr = (_keep_addr > 0);
3824         }
3825
3826         /* Step 2: clear hash table */
3827         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3828                 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3829
3830                 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3831 restart:
3832                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3833                         if (ifa->idev == idev) {
3834                                 addrconf_del_dad_work(ifa);
3835                                 /* combined flag + permanent flag decide if
3836                                  * address is retained on a down event
3837                                  */
3838                                 if (!keep_addr ||
3839                                     !(ifa->flags & IFA_F_PERMANENT) ||
3840                                     addr_is_local(&ifa->addr)) {
3841                                         hlist_del_init_rcu(&ifa->addr_lst);
3842                                         goto restart;
3843                                 }
3844                         }
3845                 }
3846                 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3847         }
3848
3849         write_lock_bh(&idev->lock);
3850
3851         addrconf_del_rs_timer(idev);
3852
3853         /* Step 2: clear flags for stateless addrconf, repeated down
3854          *         detection
3855          */
3856         was_ready = idev->if_flags & IF_READY;
3857         if (!unregister)
3858                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3859
3860         /* Step 3: clear tempaddr list */
3861         while (!list_empty(&idev->tempaddr_list)) {
3862                 ifa = list_first_entry(&idev->tempaddr_list,
3863                                        struct inet6_ifaddr, tmp_list);
3864                 list_del(&ifa->tmp_list);
3865                 write_unlock_bh(&idev->lock);
3866                 spin_lock_bh(&ifa->lock);
3867
3868                 if (ifa->ifpub) {
3869                         in6_ifa_put(ifa->ifpub);
3870                         ifa->ifpub = NULL;
3871                 }
3872                 spin_unlock_bh(&ifa->lock);
3873                 in6_ifa_put(ifa);
3874                 write_lock_bh(&idev->lock);
3875         }
3876
3877         list_for_each_entry(ifa, &idev->addr_list, if_list)
3878                 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3879         write_unlock_bh(&idev->lock);
3880
3881         while (!list_empty(&tmp_addr_list)) {
3882                 struct fib6_info *rt = NULL;
3883                 bool keep;
3884
3885                 ifa = list_first_entry(&tmp_addr_list,
3886                                        struct inet6_ifaddr, if_list_aux);
3887                 list_del(&ifa->if_list_aux);
3888
3889                 addrconf_del_dad_work(ifa);
3890
3891                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3892                         !addr_is_local(&ifa->addr);
3893
3894                 spin_lock_bh(&ifa->lock);
3895
3896                 if (keep) {
3897                         /* set state to skip the notifier below */
3898                         state = INET6_IFADDR_STATE_DEAD;
3899                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3900                         if (!(ifa->flags & IFA_F_NODAD))
3901                                 ifa->flags |= IFA_F_TENTATIVE;
3902
3903                         rt = ifa->rt;
3904                         ifa->rt = NULL;
3905                 } else {
3906                         state = ifa->state;
3907                         ifa->state = INET6_IFADDR_STATE_DEAD;
3908                 }
3909
3910                 spin_unlock_bh(&ifa->lock);
3911
3912                 if (rt)
3913                         ip6_del_rt(net, rt, false);
3914
3915                 if (state != INET6_IFADDR_STATE_DEAD) {
3916                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3917                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3918                 } else {
3919                         if (idev->cnf.forwarding)
3920                                 addrconf_leave_anycast(ifa);
3921                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3922                 }
3923
3924                 if (!keep) {
3925                         write_lock_bh(&idev->lock);
3926                         list_del_rcu(&ifa->if_list);
3927                         write_unlock_bh(&idev->lock);
3928                         in6_ifa_put(ifa);
3929                 }
3930         }
3931
3932         /* Step 5: Discard anycast and multicast list */
3933         if (unregister) {
3934                 ipv6_ac_destroy_dev(idev);
3935                 ipv6_mc_destroy_dev(idev);
3936         } else if (was_ready) {
3937                 ipv6_mc_down(idev);
3938         }
3939
3940         idev->tstamp = jiffies;
3941         idev->ra_mtu = 0;
3942
3943         /* Last: Shot the device (if unregistered) */
3944         if (unregister) {
3945                 addrconf_sysctl_unregister(idev);
3946                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3947                 neigh_ifdown(&nd_tbl, dev);
3948                 in6_dev_put(idev);
3949         }
3950         return 0;
3951 }
3952
3953 static void addrconf_rs_timer(struct timer_list *t)
3954 {
3955         struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3956         struct net_device *dev = idev->dev;
3957         struct in6_addr lladdr;
3958
3959         write_lock(&idev->lock);
3960         if (idev->dead || !(idev->if_flags & IF_READY))
3961                 goto out;
3962
3963         if (!ipv6_accept_ra(idev))
3964                 goto out;
3965
3966         /* Announcement received after solicitation was sent */
3967         if (idev->if_flags & IF_RA_RCVD)
3968                 goto out;
3969
3970         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3971                 write_unlock(&idev->lock);
3972                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3973                         ndisc_send_rs(dev, &lladdr,
3974                                       &in6addr_linklocal_allrouters);
3975                 else
3976                         goto put;
3977
3978                 write_lock(&idev->lock);
3979                 idev->rs_interval = rfc3315_s14_backoff_update(
3980                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3981                 /* The wait after the last probe can be shorter */
3982                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3983                                              idev->cnf.rtr_solicits) ?
3984                                       idev->cnf.rtr_solicit_delay :
3985                                       idev->rs_interval);
3986         } else {
3987                 /*
3988                  * Note: we do not support deprecated "all on-link"
3989                  * assumption any longer.
3990                  */
3991                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3992         }
3993
3994 out:
3995         write_unlock(&idev->lock);
3996 put:
3997         in6_dev_put(idev);
3998 }
3999
4000 /*
4001  *      Duplicate Address Detection
4002  */
4003 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4004 {
4005         unsigned long rand_num;
4006         struct inet6_dev *idev = ifp->idev;
4007         u64 nonce;
4008
4009         if (ifp->flags & IFA_F_OPTIMISTIC)
4010                 rand_num = 0;
4011         else
4012                 rand_num = get_random_u32_below(idev->cnf.rtr_solicit_delay ? : 1);
4013
4014         nonce = 0;
4015         if (idev->cnf.enhanced_dad ||
4016             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
4017                 do
4018                         get_random_bytes(&nonce, 6);
4019                 while (nonce == 0);
4020         }
4021         ifp->dad_nonce = nonce;
4022         ifp->dad_probes = idev->cnf.dad_transmits;
4023         addrconf_mod_dad_work(ifp, rand_num);
4024 }
4025
4026 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4027 {
4028         struct inet6_dev *idev = ifp->idev;
4029         struct net_device *dev = idev->dev;
4030         bool bump_id, notify = false;
4031         struct net *net;
4032
4033         addrconf_join_solict(dev, &ifp->addr);
4034
4035         read_lock_bh(&idev->lock);
4036         spin_lock(&ifp->lock);
4037         if (ifp->state == INET6_IFADDR_STATE_DEAD)
4038                 goto out;
4039
4040         net = dev_net(dev);
4041         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4042             (net->ipv6.devconf_all->accept_dad < 1 &&
4043              idev->cnf.accept_dad < 1) ||
4044             !(ifp->flags&IFA_F_TENTATIVE) ||
4045             ifp->flags & IFA_F_NODAD) {
4046                 bool send_na = false;
4047
4048                 if (ifp->flags & IFA_F_TENTATIVE &&
4049                     !(ifp->flags & IFA_F_OPTIMISTIC))
4050                         send_na = true;
4051                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4052                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4053                 spin_unlock(&ifp->lock);
4054                 read_unlock_bh(&idev->lock);
4055
4056                 addrconf_dad_completed(ifp, bump_id, send_na);
4057                 return;
4058         }
4059
4060         if (!(idev->if_flags & IF_READY)) {
4061                 spin_unlock(&ifp->lock);
4062                 read_unlock_bh(&idev->lock);
4063                 /*
4064                  * If the device is not ready:
4065                  * - keep it tentative if it is a permanent address.
4066                  * - otherwise, kill it.
4067                  */
4068                 in6_ifa_hold(ifp);
4069                 addrconf_dad_stop(ifp, 0);
4070                 return;
4071         }
4072
4073         /*
4074          * Optimistic nodes can start receiving
4075          * Frames right away
4076          */
4077         if (ifp->flags & IFA_F_OPTIMISTIC) {
4078                 ip6_ins_rt(net, ifp->rt);
4079                 if (ipv6_use_optimistic_addr(net, idev)) {
4080                         /* Because optimistic nodes can use this address,
4081                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
4082                          */
4083                         notify = true;
4084                 }
4085         }
4086
4087         addrconf_dad_kick(ifp);
4088 out:
4089         spin_unlock(&ifp->lock);
4090         read_unlock_bh(&idev->lock);
4091         if (notify)
4092                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4093 }
4094
4095 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4096 {
4097         bool begin_dad = false;
4098
4099         spin_lock_bh(&ifp->lock);
4100         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4101                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4102                 begin_dad = true;
4103         }
4104         spin_unlock_bh(&ifp->lock);
4105
4106         if (begin_dad)
4107                 addrconf_mod_dad_work(ifp, 0);
4108 }
4109
4110 static void addrconf_dad_work(struct work_struct *w)
4111 {
4112         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4113                                                 struct inet6_ifaddr,
4114                                                 dad_work);
4115         struct inet6_dev *idev = ifp->idev;
4116         bool bump_id, disable_ipv6 = false;
4117         struct in6_addr mcaddr;
4118
4119         enum {
4120                 DAD_PROCESS,
4121                 DAD_BEGIN,
4122                 DAD_ABORT,
4123         } action = DAD_PROCESS;
4124
4125         rtnl_lock();
4126
4127         spin_lock_bh(&ifp->lock);
4128         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4129                 action = DAD_BEGIN;
4130                 ifp->state = INET6_IFADDR_STATE_DAD;
4131         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4132                 action = DAD_ABORT;
4133                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4134
4135                 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4136                      idev->cnf.accept_dad > 1) &&
4137                     !idev->cnf.disable_ipv6 &&
4138                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4139                         struct in6_addr addr;
4140
4141                         addr.s6_addr32[0] = htonl(0xfe800000);
4142                         addr.s6_addr32[1] = 0;
4143
4144                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4145                             ipv6_addr_equal(&ifp->addr, &addr)) {
4146                                 /* DAD failed for link-local based on MAC */
4147                                 idev->cnf.disable_ipv6 = 1;
4148
4149                                 pr_info("%s: IPv6 being disabled!\n",
4150                                         ifp->idev->dev->name);
4151                                 disable_ipv6 = true;
4152                         }
4153                 }
4154         }
4155         spin_unlock_bh(&ifp->lock);
4156
4157         if (action == DAD_BEGIN) {
4158                 addrconf_dad_begin(ifp);
4159                 goto out;
4160         } else if (action == DAD_ABORT) {
4161                 in6_ifa_hold(ifp);
4162                 addrconf_dad_stop(ifp, 1);
4163                 if (disable_ipv6)
4164                         addrconf_ifdown(idev->dev, false);
4165                 goto out;
4166         }
4167
4168         if (!ifp->dad_probes && addrconf_dad_end(ifp))
4169                 goto out;
4170
4171         write_lock_bh(&idev->lock);
4172         if (idev->dead || !(idev->if_flags & IF_READY)) {
4173                 write_unlock_bh(&idev->lock);
4174                 goto out;
4175         }
4176
4177         spin_lock(&ifp->lock);
4178         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4179                 spin_unlock(&ifp->lock);
4180                 write_unlock_bh(&idev->lock);
4181                 goto out;
4182         }
4183
4184         if (ifp->dad_probes == 0) {
4185                 bool send_na = false;
4186
4187                 /*
4188                  * DAD was successful
4189                  */
4190
4191                 if (ifp->flags & IFA_F_TENTATIVE &&
4192                     !(ifp->flags & IFA_F_OPTIMISTIC))
4193                         send_na = true;
4194                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4195                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4196                 spin_unlock(&ifp->lock);
4197                 write_unlock_bh(&idev->lock);
4198
4199                 addrconf_dad_completed(ifp, bump_id, send_na);
4200
4201                 goto out;
4202         }
4203
4204         ifp->dad_probes--;
4205         addrconf_mod_dad_work(ifp,
4206                               max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4207                                   HZ/100));
4208         spin_unlock(&ifp->lock);
4209         write_unlock_bh(&idev->lock);
4210
4211         /* send a neighbour solicitation for our addr */
4212         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4213         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4214                       ifp->dad_nonce);
4215 out:
4216         in6_ifa_put(ifp);
4217         rtnl_unlock();
4218 }
4219
4220 /* ifp->idev must be at least read locked */
4221 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4222 {
4223         struct inet6_ifaddr *ifpiter;
4224         struct inet6_dev *idev = ifp->idev;
4225
4226         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4227                 if (ifpiter->scope > IFA_LINK)
4228                         break;
4229                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4230                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4231                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4232                     IFA_F_PERMANENT)
4233                         return false;
4234         }
4235         return true;
4236 }
4237
4238 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4239                                    bool send_na)
4240 {
4241         struct net_device *dev = ifp->idev->dev;
4242         struct in6_addr lladdr;
4243         bool send_rs, send_mld;
4244
4245         addrconf_del_dad_work(ifp);
4246
4247         /*
4248          *      Configure the address for reception. Now it is valid.
4249          */
4250
4251         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4252
4253         /* If added prefix is link local and we are prepared to process
4254            router advertisements, start sending router solicitations.
4255          */
4256
4257         read_lock_bh(&ifp->idev->lock);
4258         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4259         send_rs = send_mld &&
4260                   ipv6_accept_ra(ifp->idev) &&
4261                   ifp->idev->cnf.rtr_solicits != 0 &&
4262                   (dev->flags & IFF_LOOPBACK) == 0 &&
4263                   (dev->type != ARPHRD_TUNNEL) &&
4264                   !netif_is_team_port(dev);
4265         read_unlock_bh(&ifp->idev->lock);
4266
4267         /* While dad is in progress mld report's source address is in6_addrany.
4268          * Resend with proper ll now.
4269          */
4270         if (send_mld)
4271                 ipv6_mc_dad_complete(ifp->idev);
4272
4273         /* send unsolicited NA if enabled */
4274         if (send_na &&
4275             (ifp->idev->cnf.ndisc_notify ||
4276              dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4277                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4278                               /*router=*/ !!ifp->idev->cnf.forwarding,
4279                               /*solicited=*/ false, /*override=*/ true,
4280                               /*inc_opt=*/ true);
4281         }
4282
4283         if (send_rs) {
4284                 /*
4285                  *      If a host as already performed a random delay
4286                  *      [...] as part of DAD [...] there is no need
4287                  *      to delay again before sending the first RS
4288                  */
4289                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4290                         return;
4291                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4292
4293                 write_lock_bh(&ifp->idev->lock);
4294                 spin_lock(&ifp->lock);
4295                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4296                         ifp->idev->cnf.rtr_solicit_interval);
4297                 ifp->idev->rs_probes = 1;
4298                 ifp->idev->if_flags |= IF_RS_SENT;
4299                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4300                 spin_unlock(&ifp->lock);
4301                 write_unlock_bh(&ifp->idev->lock);
4302         }
4303
4304         if (bump_id)
4305                 rt_genid_bump_ipv6(dev_net(dev));
4306
4307         /* Make sure that a new temporary address will be created
4308          * before this temporary address becomes deprecated.
4309          */
4310         if (ifp->flags & IFA_F_TEMPORARY)
4311                 addrconf_verify_rtnl(dev_net(dev));
4312 }
4313
4314 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4315 {
4316         struct inet6_ifaddr *ifp;
4317
4318         read_lock_bh(&idev->lock);
4319         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4320                 spin_lock(&ifp->lock);
4321                 if ((ifp->flags & IFA_F_TENTATIVE &&
4322                      ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4323                         if (restart)
4324                                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4325                         addrconf_dad_kick(ifp);
4326                 }
4327                 spin_unlock(&ifp->lock);
4328         }
4329         read_unlock_bh(&idev->lock);
4330 }
4331
4332 #ifdef CONFIG_PROC_FS
4333 struct if6_iter_state {
4334         struct seq_net_private p;
4335         int bucket;
4336         int offset;
4337 };
4338
4339 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4340 {
4341         struct if6_iter_state *state = seq->private;
4342         struct net *net = seq_file_net(seq);
4343         struct inet6_ifaddr *ifa = NULL;
4344         int p = 0;
4345
4346         /* initial bucket if pos is 0 */
4347         if (pos == 0) {
4348                 state->bucket = 0;
4349                 state->offset = 0;
4350         }
4351
4352         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4353                 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4354                                          addr_lst) {
4355                         /* sync with offset */
4356                         if (p < state->offset) {
4357                                 p++;
4358                                 continue;
4359                         }
4360                         return ifa;
4361                 }
4362
4363                 /* prepare for next bucket */
4364                 state->offset = 0;
4365                 p = 0;
4366         }
4367         return NULL;
4368 }
4369
4370 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4371                                          struct inet6_ifaddr *ifa)
4372 {
4373         struct if6_iter_state *state = seq->private;
4374         struct net *net = seq_file_net(seq);
4375
4376         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4377                 state->offset++;
4378                 return ifa;
4379         }
4380
4381         state->offset = 0;
4382         while (++state->bucket < IN6_ADDR_HSIZE) {
4383                 hlist_for_each_entry_rcu(ifa,
4384                                      &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4385                         return ifa;
4386                 }
4387         }
4388
4389         return NULL;
4390 }
4391
4392 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4393         __acquires(rcu)
4394 {
4395         rcu_read_lock();
4396         return if6_get_first(seq, *pos);
4397 }
4398
4399 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4400 {
4401         struct inet6_ifaddr *ifa;
4402
4403         ifa = if6_get_next(seq, v);
4404         ++*pos;
4405         return ifa;
4406 }
4407
4408 static void if6_seq_stop(struct seq_file *seq, void *v)
4409         __releases(rcu)
4410 {
4411         rcu_read_unlock();
4412 }
4413
4414 static int if6_seq_show(struct seq_file *seq, void *v)
4415 {
4416         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4417         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4418                    &ifp->addr,
4419                    ifp->idev->dev->ifindex,
4420                    ifp->prefix_len,
4421                    ifp->scope,
4422                    (u8) ifp->flags,
4423                    ifp->idev->dev->name);
4424         return 0;
4425 }
4426
4427 static const struct seq_operations if6_seq_ops = {
4428         .start  = if6_seq_start,
4429         .next   = if6_seq_next,
4430         .show   = if6_seq_show,
4431         .stop   = if6_seq_stop,
4432 };
4433
4434 static int __net_init if6_proc_net_init(struct net *net)
4435 {
4436         if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4437                         sizeof(struct if6_iter_state)))
4438                 return -ENOMEM;
4439         return 0;
4440 }
4441
4442 static void __net_exit if6_proc_net_exit(struct net *net)
4443 {
4444         remove_proc_entry("if_inet6", net->proc_net);
4445 }
4446
4447 static struct pernet_operations if6_proc_net_ops = {
4448         .init = if6_proc_net_init,
4449         .exit = if6_proc_net_exit,
4450 };
4451
4452 int __init if6_proc_init(void)
4453 {
4454         return register_pernet_subsys(&if6_proc_net_ops);
4455 }
4456
4457 void if6_proc_exit(void)
4458 {
4459         unregister_pernet_subsys(&if6_proc_net_ops);
4460 }
4461 #endif  /* CONFIG_PROC_FS */
4462
4463 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4464 /* Check if address is a home address configured on any interface. */
4465 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4466 {
4467         unsigned int hash = inet6_addr_hash(net, addr);
4468         struct inet6_ifaddr *ifp = NULL;
4469         int ret = 0;
4470
4471         rcu_read_lock();
4472         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4473                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4474                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4475                         ret = 1;
4476                         break;
4477                 }
4478         }
4479         rcu_read_unlock();
4480         return ret;
4481 }
4482 #endif
4483
4484 /* RFC6554 has some algorithm to avoid loops in segment routing by
4485  * checking if the segments contains any of a local interface address.
4486  *
4487  * Quote:
4488  *
4489  * To detect loops in the SRH, a router MUST determine if the SRH
4490  * includes multiple addresses assigned to any interface on that router.
4491  * If such addresses appear more than once and are separated by at least
4492  * one address not assigned to that router.
4493  */
4494 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4495                           unsigned char nsegs)
4496 {
4497         const struct in6_addr *addr;
4498         int i, ret = 0, found = 0;
4499         struct inet6_ifaddr *ifp;
4500         bool separated = false;
4501         unsigned int hash;
4502         bool hash_found;
4503
4504         rcu_read_lock();
4505         for (i = 0; i < nsegs; i++) {
4506                 addr = &segs[i];
4507                 hash = inet6_addr_hash(net, addr);
4508
4509                 hash_found = false;
4510                 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4511
4512                         if (ipv6_addr_equal(&ifp->addr, addr)) {
4513                                 hash_found = true;
4514                                 break;
4515                         }
4516                 }
4517
4518                 if (hash_found) {
4519                         if (found > 1 && separated) {
4520                                 ret = 1;
4521                                 break;
4522                         }
4523
4524                         separated = false;
4525                         found++;
4526                 } else {
4527                         separated = true;
4528                 }
4529         }
4530         rcu_read_unlock();
4531
4532         return ret;
4533 }
4534
4535 /*
4536  *      Periodic address status verification
4537  */
4538
4539 static void addrconf_verify_rtnl(struct net *net)
4540 {
4541         unsigned long now, next, next_sec, next_sched;
4542         struct inet6_ifaddr *ifp;
4543         int i;
4544
4545         ASSERT_RTNL();
4546
4547         rcu_read_lock_bh();
4548         now = jiffies;
4549         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4550
4551         cancel_delayed_work(&net->ipv6.addr_chk_work);
4552
4553         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4554 restart:
4555                 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4556                         unsigned long age;
4557
4558                         /* When setting preferred_lft to a value not zero or
4559                          * infinity, while valid_lft is infinity
4560                          * IFA_F_PERMANENT has a non-infinity life time.
4561                          */
4562                         if ((ifp->flags & IFA_F_PERMANENT) &&
4563                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4564                                 continue;
4565
4566                         spin_lock(&ifp->lock);
4567                         /* We try to batch several events at once. */
4568                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4569
4570                         if ((ifp->flags&IFA_F_TEMPORARY) &&
4571                             !(ifp->flags&IFA_F_TENTATIVE) &&
4572                             ifp->prefered_lft != INFINITY_LIFE_TIME &&
4573                             !ifp->regen_count && ifp->ifpub) {
4574                                 /* This is a non-regenerated temporary addr. */
4575
4576                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4577                                         ifp->idev->cnf.dad_transmits *
4578                                         max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4579
4580                                 if (age + regen_advance >= ifp->prefered_lft) {
4581                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4582                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4583                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4584
4585                                         ifp->regen_count++;
4586                                         in6_ifa_hold(ifp);
4587                                         in6_ifa_hold(ifpub);
4588                                         spin_unlock(&ifp->lock);
4589
4590                                         spin_lock(&ifpub->lock);
4591                                         ifpub->regen_count = 0;
4592                                         spin_unlock(&ifpub->lock);
4593                                         rcu_read_unlock_bh();
4594                                         ipv6_create_tempaddr(ifpub, true);
4595                                         in6_ifa_put(ifpub);
4596                                         in6_ifa_put(ifp);
4597                                         rcu_read_lock_bh();
4598                                         goto restart;
4599                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4600                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4601                         }
4602
4603                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4604                             age >= ifp->valid_lft) {
4605                                 spin_unlock(&ifp->lock);
4606                                 in6_ifa_hold(ifp);
4607                                 rcu_read_unlock_bh();
4608                                 ipv6_del_addr(ifp);
4609                                 rcu_read_lock_bh();
4610                                 goto restart;
4611                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4612                                 spin_unlock(&ifp->lock);
4613                                 continue;
4614                         } else if (age >= ifp->prefered_lft) {
4615                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4616                                 int deprecate = 0;
4617
4618                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4619                                         deprecate = 1;
4620                                         ifp->flags |= IFA_F_DEPRECATED;
4621                                 }
4622
4623                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4624                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4625                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4626
4627                                 spin_unlock(&ifp->lock);
4628
4629                                 if (deprecate) {
4630                                         in6_ifa_hold(ifp);
4631
4632                                         ipv6_ifa_notify(0, ifp);
4633                                         in6_ifa_put(ifp);
4634                                         goto restart;
4635                                 }
4636                         } else {
4637                                 /* ifp->prefered_lft <= ifp->valid_lft */
4638                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4639                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4640                                 spin_unlock(&ifp->lock);
4641                         }
4642                 }
4643         }
4644
4645         next_sec = round_jiffies_up(next);
4646         next_sched = next;
4647
4648         /* If rounded timeout is accurate enough, accept it. */
4649         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4650                 next_sched = next_sec;
4651
4652         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4653         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4654                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4655
4656         pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4657                  now, next, next_sec, next_sched);
4658         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4659         rcu_read_unlock_bh();
4660 }
4661
4662 static void addrconf_verify_work(struct work_struct *w)
4663 {
4664         struct net *net = container_of(to_delayed_work(w), struct net,
4665                                        ipv6.addr_chk_work);
4666
4667         rtnl_lock();
4668         addrconf_verify_rtnl(net);
4669         rtnl_unlock();
4670 }
4671
4672 static void addrconf_verify(struct net *net)
4673 {
4674         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4675 }
4676
4677 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4678                                      struct in6_addr **peer_pfx)
4679 {
4680         struct in6_addr *pfx = NULL;
4681
4682         *peer_pfx = NULL;
4683
4684         if (addr)
4685                 pfx = nla_data(addr);
4686
4687         if (local) {
4688                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4689                         *peer_pfx = pfx;
4690                 pfx = nla_data(local);
4691         }
4692
4693         return pfx;
4694 }
4695
4696 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4697         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4698         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4699         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4700         [IFA_FLAGS]             = { .len = sizeof(u32) },
4701         [IFA_RT_PRIORITY]       = { .len = sizeof(u32) },
4702         [IFA_TARGET_NETNSID]    = { .type = NLA_S32 },
4703         [IFA_PROTO]             = { .type = NLA_U8 },
4704 };
4705
4706 static int
4707 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4708                   struct netlink_ext_ack *extack)
4709 {
4710         struct net *net = sock_net(skb->sk);
4711         struct ifaddrmsg *ifm;
4712         struct nlattr *tb[IFA_MAX+1];
4713         struct in6_addr *pfx, *peer_pfx;
4714         u32 ifa_flags;
4715         int err;
4716
4717         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4718                                      ifa_ipv6_policy, extack);
4719         if (err < 0)
4720                 return err;
4721
4722         ifm = nlmsg_data(nlh);
4723         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4724         if (!pfx)
4725                 return -EINVAL;
4726
4727         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4728
4729         /* We ignore other flags so far. */
4730         ifa_flags &= IFA_F_MANAGETEMPADDR;
4731
4732         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4733                               ifm->ifa_prefixlen, extack);
4734 }
4735
4736 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4737                                unsigned long expires, u32 flags,
4738                                bool modify_peer)
4739 {
4740         struct fib6_info *f6i;
4741         u32 prio;
4742
4743         f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4744                                         ifp->prefix_len,
4745                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
4746         if (!f6i)
4747                 return -ENOENT;
4748
4749         prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4750         if (f6i->fib6_metric != prio) {
4751                 /* delete old one */
4752                 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4753
4754                 /* add new one */
4755                 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4756                                       ifp->prefix_len,
4757                                       ifp->rt_priority, ifp->idev->dev,
4758                                       expires, flags, GFP_KERNEL);
4759         } else {
4760                 if (!expires)
4761                         fib6_clean_expires(f6i);
4762                 else
4763                         fib6_set_expires(f6i, expires);
4764
4765                 fib6_info_release(f6i);
4766         }
4767
4768         return 0;
4769 }
4770
4771 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4772                              struct ifa6_config *cfg)
4773 {
4774         u32 flags;
4775         clock_t expires;
4776         unsigned long timeout;
4777         bool was_managetempaddr;
4778         bool had_prefixroute;
4779         bool new_peer = false;
4780
4781         ASSERT_RTNL();
4782
4783         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4784                 return -EINVAL;
4785
4786         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4787             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4788                 return -EINVAL;
4789
4790         if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4791                 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4792
4793         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4794         if (addrconf_finite_timeout(timeout)) {
4795                 expires = jiffies_to_clock_t(timeout * HZ);
4796                 cfg->valid_lft = timeout;
4797                 flags = RTF_EXPIRES;
4798         } else {
4799                 expires = 0;
4800                 flags = 0;
4801                 cfg->ifa_flags |= IFA_F_PERMANENT;
4802         }
4803
4804         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4805         if (addrconf_finite_timeout(timeout)) {
4806                 if (timeout == 0)
4807                         cfg->ifa_flags |= IFA_F_DEPRECATED;
4808                 cfg->preferred_lft = timeout;
4809         }
4810
4811         if (cfg->peer_pfx &&
4812             memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4813                 if (!ipv6_addr_any(&ifp->peer_addr))
4814                         cleanup_prefix_route(ifp, expires, true, true);
4815                 new_peer = true;
4816         }
4817
4818         spin_lock_bh(&ifp->lock);
4819         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4820         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4821                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4822         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4823                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4824                         IFA_F_NOPREFIXROUTE);
4825         ifp->flags |= cfg->ifa_flags;
4826         ifp->tstamp = jiffies;
4827         ifp->valid_lft = cfg->valid_lft;
4828         ifp->prefered_lft = cfg->preferred_lft;
4829         ifp->ifa_proto = cfg->ifa_proto;
4830
4831         if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4832                 ifp->rt_priority = cfg->rt_priority;
4833
4834         if (new_peer)
4835                 ifp->peer_addr = *cfg->peer_pfx;
4836
4837         spin_unlock_bh(&ifp->lock);
4838         if (!(ifp->flags&IFA_F_TENTATIVE))
4839                 ipv6_ifa_notify(0, ifp);
4840
4841         if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4842                 int rc = -ENOENT;
4843
4844                 if (had_prefixroute)
4845                         rc = modify_prefix_route(ifp, expires, flags, false);
4846
4847                 /* prefix route could have been deleted; if so restore it */
4848                 if (rc == -ENOENT) {
4849                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4850                                               ifp->rt_priority, ifp->idev->dev,
4851                                               expires, flags, GFP_KERNEL);
4852                 }
4853
4854                 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4855                         rc = modify_prefix_route(ifp, expires, flags, true);
4856
4857                 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4858                         addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4859                                               ifp->rt_priority, ifp->idev->dev,
4860                                               expires, flags, GFP_KERNEL);
4861                 }
4862         } else if (had_prefixroute) {
4863                 enum cleanup_prefix_rt_t action;
4864                 unsigned long rt_expires;
4865
4866                 write_lock_bh(&ifp->idev->lock);
4867                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4868                 write_unlock_bh(&ifp->idev->lock);
4869
4870                 if (action != CLEANUP_PREFIX_RT_NOP) {
4871                         cleanup_prefix_route(ifp, rt_expires,
4872                                 action == CLEANUP_PREFIX_RT_DEL, false);
4873                 }
4874         }
4875
4876         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4877                 if (was_managetempaddr &&
4878                     !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4879                         cfg->valid_lft = 0;
4880                         cfg->preferred_lft = 0;
4881                 }
4882                 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4883                                  cfg->preferred_lft, !was_managetempaddr,
4884                                  jiffies);
4885         }
4886
4887         addrconf_verify_rtnl(net);
4888
4889         return 0;
4890 }
4891
4892 static int
4893 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4894                   struct netlink_ext_ack *extack)
4895 {
4896         struct net *net = sock_net(skb->sk);
4897         struct ifaddrmsg *ifm;
4898         struct nlattr *tb[IFA_MAX+1];
4899         struct in6_addr *peer_pfx;
4900         struct inet6_ifaddr *ifa;
4901         struct net_device *dev;
4902         struct inet6_dev *idev;
4903         struct ifa6_config cfg;
4904         int err;
4905
4906         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4907                                      ifa_ipv6_policy, extack);
4908         if (err < 0)
4909                 return err;
4910
4911         memset(&cfg, 0, sizeof(cfg));
4912
4913         ifm = nlmsg_data(nlh);
4914         cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4915         if (!cfg.pfx)
4916                 return -EINVAL;
4917
4918         cfg.peer_pfx = peer_pfx;
4919         cfg.plen = ifm->ifa_prefixlen;
4920         if (tb[IFA_RT_PRIORITY])
4921                 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4922
4923         if (tb[IFA_PROTO])
4924                 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4925
4926         cfg.valid_lft = INFINITY_LIFE_TIME;
4927         cfg.preferred_lft = INFINITY_LIFE_TIME;
4928
4929         if (tb[IFA_CACHEINFO]) {
4930                 struct ifa_cacheinfo *ci;
4931
4932                 ci = nla_data(tb[IFA_CACHEINFO]);
4933                 cfg.valid_lft = ci->ifa_valid;
4934                 cfg.preferred_lft = ci->ifa_prefered;
4935         }
4936
4937         dev =  __dev_get_by_index(net, ifm->ifa_index);
4938         if (!dev) {
4939                 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
4940                 return -ENODEV;
4941         }
4942
4943         if (tb[IFA_FLAGS])
4944                 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4945         else
4946                 cfg.ifa_flags = ifm->ifa_flags;
4947
4948         /* We ignore other flags so far. */
4949         cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4950                          IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4951                          IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4952
4953         idev = ipv6_find_idev(dev);
4954         if (IS_ERR(idev))
4955                 return PTR_ERR(idev);
4956
4957         if (!ipv6_allow_optimistic_dad(net, idev))
4958                 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4959
4960         if (cfg.ifa_flags & IFA_F_NODAD &&
4961             cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4962                 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4963                 return -EINVAL;
4964         }
4965
4966         ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4967         if (!ifa) {
4968                 /*
4969                  * It would be best to check for !NLM_F_CREATE here but
4970                  * userspace already relies on not having to provide this.
4971                  */
4972                 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4973         }
4974
4975         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4976             !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
4977                 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
4978                 err = -EEXIST;
4979         } else {
4980                 err = inet6_addr_modify(net, ifa, &cfg);
4981         }
4982
4983         in6_ifa_put(ifa);
4984
4985         return err;
4986 }
4987
4988 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4989                           u8 scope, int ifindex)
4990 {
4991         struct ifaddrmsg *ifm;
4992
4993         ifm = nlmsg_data(nlh);
4994         ifm->ifa_family = AF_INET6;
4995         ifm->ifa_prefixlen = prefixlen;
4996         ifm->ifa_flags = flags;
4997         ifm->ifa_scope = scope;
4998         ifm->ifa_index = ifindex;
4999 }
5000
5001 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5002                          unsigned long tstamp, u32 preferred, u32 valid)
5003 {
5004         struct ifa_cacheinfo ci;
5005
5006         ci.cstamp = cstamp_delta(cstamp);
5007         ci.tstamp = cstamp_delta(tstamp);
5008         ci.ifa_prefered = preferred;
5009         ci.ifa_valid = valid;
5010
5011         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5012 }
5013
5014 static inline int rt_scope(int ifa_scope)
5015 {
5016         if (ifa_scope & IFA_HOST)
5017                 return RT_SCOPE_HOST;
5018         else if (ifa_scope & IFA_LINK)
5019                 return RT_SCOPE_LINK;
5020         else if (ifa_scope & IFA_SITE)
5021                 return RT_SCOPE_SITE;
5022         else
5023                 return RT_SCOPE_UNIVERSE;
5024 }
5025
5026 static inline int inet6_ifaddr_msgsize(void)
5027 {
5028         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5029                + nla_total_size(16) /* IFA_LOCAL */
5030                + nla_total_size(16) /* IFA_ADDRESS */
5031                + nla_total_size(sizeof(struct ifa_cacheinfo))
5032                + nla_total_size(4)  /* IFA_FLAGS */
5033                + nla_total_size(1)  /* IFA_PROTO */
5034                + nla_total_size(4)  /* IFA_RT_PRIORITY */;
5035 }
5036
5037 enum addr_type_t {
5038         UNICAST_ADDR,
5039         MULTICAST_ADDR,
5040         ANYCAST_ADDR,
5041 };
5042
5043 struct inet6_fill_args {
5044         u32 portid;
5045         u32 seq;
5046         int event;
5047         unsigned int flags;
5048         int netnsid;
5049         int ifindex;
5050         enum addr_type_t type;
5051 };
5052
5053 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
5054                              struct inet6_fill_args *args)
5055 {
5056         struct nlmsghdr  *nlh;
5057         u32 preferred, valid;
5058
5059         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5060                         sizeof(struct ifaddrmsg), args->flags);
5061         if (!nlh)
5062                 return -EMSGSIZE;
5063
5064         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5065                       ifa->idev->dev->ifindex);
5066
5067         if (args->netnsid >= 0 &&
5068             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5069                 goto error;
5070
5071         spin_lock_bh(&ifa->lock);
5072         if (!((ifa->flags&IFA_F_PERMANENT) &&
5073               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5074                 preferred = ifa->prefered_lft;
5075                 valid = ifa->valid_lft;
5076                 if (preferred != INFINITY_LIFE_TIME) {
5077                         long tval = (jiffies - ifa->tstamp)/HZ;
5078                         if (preferred > tval)
5079                                 preferred -= tval;
5080                         else
5081                                 preferred = 0;
5082                         if (valid != INFINITY_LIFE_TIME) {
5083                                 if (valid > tval)
5084                                         valid -= tval;
5085                                 else
5086                                         valid = 0;
5087                         }
5088                 }
5089         } else {
5090                 preferred = INFINITY_LIFE_TIME;
5091                 valid = INFINITY_LIFE_TIME;
5092         }
5093         spin_unlock_bh(&ifa->lock);
5094
5095         if (!ipv6_addr_any(&ifa->peer_addr)) {
5096                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5097                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5098                         goto error;
5099         } else
5100                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5101                         goto error;
5102
5103         if (ifa->rt_priority &&
5104             nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5105                 goto error;
5106
5107         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5108                 goto error;
5109
5110         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5111                 goto error;
5112
5113         if (ifa->ifa_proto &&
5114             nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
5115                 goto error;
5116
5117         nlmsg_end(skb, nlh);
5118         return 0;
5119
5120 error:
5121         nlmsg_cancel(skb, nlh);
5122         return -EMSGSIZE;
5123 }
5124
5125 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5126                                struct inet6_fill_args *args)
5127 {
5128         struct nlmsghdr  *nlh;
5129         u8 scope = RT_SCOPE_UNIVERSE;
5130         int ifindex = ifmca->idev->dev->ifindex;
5131
5132         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5133                 scope = RT_SCOPE_SITE;
5134
5135         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5136                         sizeof(struct ifaddrmsg), args->flags);
5137         if (!nlh)
5138                 return -EMSGSIZE;
5139
5140         if (args->netnsid >= 0 &&
5141             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5142                 nlmsg_cancel(skb, nlh);
5143                 return -EMSGSIZE;
5144         }
5145
5146         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5147         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5148             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5149                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5150                 nlmsg_cancel(skb, nlh);
5151                 return -EMSGSIZE;
5152         }
5153
5154         nlmsg_end(skb, nlh);
5155         return 0;
5156 }
5157
5158 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5159                                struct inet6_fill_args *args)
5160 {
5161         struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5162         int ifindex = dev ? dev->ifindex : 1;
5163         struct nlmsghdr  *nlh;
5164         u8 scope = RT_SCOPE_UNIVERSE;
5165
5166         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5167                 scope = RT_SCOPE_SITE;
5168
5169         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5170                         sizeof(struct ifaddrmsg), args->flags);
5171         if (!nlh)
5172                 return -EMSGSIZE;
5173
5174         if (args->netnsid >= 0 &&
5175             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5176                 nlmsg_cancel(skb, nlh);
5177                 return -EMSGSIZE;
5178         }
5179
5180         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5181         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5182             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5183                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5184                 nlmsg_cancel(skb, nlh);
5185                 return -EMSGSIZE;
5186         }
5187
5188         nlmsg_end(skb, nlh);
5189         return 0;
5190 }
5191
5192 /* called with rcu_read_lock() */
5193 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5194                           struct netlink_callback *cb, int s_ip_idx,
5195                           struct inet6_fill_args *fillargs)
5196 {
5197         struct ifmcaddr6 *ifmca;
5198         struct ifacaddr6 *ifaca;
5199         int ip_idx = 0;
5200         int err = 1;
5201
5202         read_lock_bh(&idev->lock);
5203         switch (fillargs->type) {
5204         case UNICAST_ADDR: {
5205                 struct inet6_ifaddr *ifa;
5206                 fillargs->event = RTM_NEWADDR;
5207
5208                 /* unicast address incl. temp addr */
5209                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5210                         if (ip_idx < s_ip_idx)
5211                                 goto next;
5212                         err = inet6_fill_ifaddr(skb, ifa, fillargs);
5213                         if (err < 0)
5214                                 break;
5215                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5216 next:
5217                         ip_idx++;
5218                 }
5219                 break;
5220         }
5221         case MULTICAST_ADDR:
5222                 read_unlock_bh(&idev->lock);
5223                 fillargs->event = RTM_GETMULTICAST;
5224
5225                 /* multicast address */
5226                 for (ifmca = rtnl_dereference(idev->mc_list);
5227                      ifmca;
5228                      ifmca = rtnl_dereference(ifmca->next), ip_idx++) {
5229                         if (ip_idx < s_ip_idx)
5230                                 continue;
5231                         err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5232                         if (err < 0)
5233                                 break;
5234                 }
5235                 read_lock_bh(&idev->lock);
5236                 break;
5237         case ANYCAST_ADDR:
5238                 fillargs->event = RTM_GETANYCAST;
5239                 /* anycast address */
5240                 for (ifaca = idev->ac_list; ifaca;
5241                      ifaca = ifaca->aca_next, ip_idx++) {
5242                         if (ip_idx < s_ip_idx)
5243                                 continue;
5244                         err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5245                         if (err < 0)
5246                                 break;
5247                 }
5248                 break;
5249         default:
5250                 break;
5251         }
5252         read_unlock_bh(&idev->lock);
5253         cb->args[2] = ip_idx;
5254         return err;
5255 }
5256
5257 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5258                                        struct inet6_fill_args *fillargs,
5259                                        struct net **tgt_net, struct sock *sk,
5260                                        struct netlink_callback *cb)
5261 {
5262         struct netlink_ext_ack *extack = cb->extack;
5263         struct nlattr *tb[IFA_MAX+1];
5264         struct ifaddrmsg *ifm;
5265         int err, i;
5266
5267         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5268                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5269                 return -EINVAL;
5270         }
5271
5272         ifm = nlmsg_data(nlh);
5273         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5274                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5275                 return -EINVAL;
5276         }
5277
5278         fillargs->ifindex = ifm->ifa_index;
5279         if (fillargs->ifindex) {
5280                 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5281                 fillargs->flags |= NLM_F_DUMP_FILTERED;
5282         }
5283
5284         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5285                                             ifa_ipv6_policy, extack);
5286         if (err < 0)
5287                 return err;
5288
5289         for (i = 0; i <= IFA_MAX; ++i) {
5290                 if (!tb[i])
5291                         continue;
5292
5293                 if (i == IFA_TARGET_NETNSID) {
5294                         struct net *net;
5295
5296                         fillargs->netnsid = nla_get_s32(tb[i]);
5297                         net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5298                         if (IS_ERR(net)) {
5299                                 fillargs->netnsid = -1;
5300                                 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5301                                 return PTR_ERR(net);
5302                         }
5303                         *tgt_net = net;
5304                 } else {
5305                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5306                         return -EINVAL;
5307                 }
5308         }
5309
5310         return 0;
5311 }
5312
5313 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5314                            enum addr_type_t type)
5315 {
5316         const struct nlmsghdr *nlh = cb->nlh;
5317         struct inet6_fill_args fillargs = {
5318                 .portid = NETLINK_CB(cb->skb).portid,
5319                 .seq = cb->nlh->nlmsg_seq,
5320                 .flags = NLM_F_MULTI,
5321                 .netnsid = -1,
5322                 .type = type,
5323         };
5324         struct net *tgt_net = sock_net(skb->sk);
5325         int idx, s_idx, s_ip_idx;
5326         int h, s_h;
5327         struct net_device *dev;
5328         struct inet6_dev *idev;
5329         struct hlist_head *head;
5330         int err = 0;
5331
5332         s_h = cb->args[0];
5333         s_idx = idx = cb->args[1];
5334         s_ip_idx = cb->args[2];
5335
5336         if (cb->strict_check) {
5337                 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5338                                                   skb->sk, cb);
5339                 if (err < 0)
5340                         goto put_tgt_net;
5341
5342                 err = 0;
5343                 if (fillargs.ifindex) {
5344                         dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5345                         if (!dev) {
5346                                 err = -ENODEV;
5347                                 goto put_tgt_net;
5348                         }
5349                         idev = __in6_dev_get(dev);
5350                         if (idev) {
5351                                 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5352                                                      &fillargs);
5353                                 if (err > 0)
5354                                         err = 0;
5355                         }
5356                         goto put_tgt_net;
5357                 }
5358         }
5359
5360         rcu_read_lock();
5361         cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5362         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5363                 idx = 0;
5364                 head = &tgt_net->dev_index_head[h];
5365                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5366                         if (idx < s_idx)
5367                                 goto cont;
5368                         if (h > s_h || idx > s_idx)
5369                                 s_ip_idx = 0;
5370                         idev = __in6_dev_get(dev);
5371                         if (!idev)
5372                                 goto cont;
5373
5374                         if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5375                                            &fillargs) < 0)
5376                                 goto done;
5377 cont:
5378                         idx++;
5379                 }
5380         }
5381 done:
5382         rcu_read_unlock();
5383         cb->args[0] = h;
5384         cb->args[1] = idx;
5385 put_tgt_net:
5386         if (fillargs.netnsid >= 0)
5387                 put_net(tgt_net);
5388
5389         return skb->len ? : err;
5390 }
5391
5392 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5393 {
5394         enum addr_type_t type = UNICAST_ADDR;
5395
5396         return inet6_dump_addr(skb, cb, type);
5397 }
5398
5399 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5400 {
5401         enum addr_type_t type = MULTICAST_ADDR;
5402
5403         return inet6_dump_addr(skb, cb, type);
5404 }
5405
5406
5407 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5408 {
5409         enum addr_type_t type = ANYCAST_ADDR;
5410
5411         return inet6_dump_addr(skb, cb, type);
5412 }
5413
5414 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5415                                        const struct nlmsghdr *nlh,
5416                                        struct nlattr **tb,
5417                                        struct netlink_ext_ack *extack)
5418 {
5419         struct ifaddrmsg *ifm;
5420         int i, err;
5421
5422         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5423                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5424                 return -EINVAL;
5425         }
5426
5427         if (!netlink_strict_get_check(skb))
5428                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5429                                               ifa_ipv6_policy, extack);
5430
5431         ifm = nlmsg_data(nlh);
5432         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5433                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5434                 return -EINVAL;
5435         }
5436
5437         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5438                                             ifa_ipv6_policy, extack);
5439         if (err)
5440                 return err;
5441
5442         for (i = 0; i <= IFA_MAX; i++) {
5443                 if (!tb[i])
5444                         continue;
5445
5446                 switch (i) {
5447                 case IFA_TARGET_NETNSID:
5448                 case IFA_ADDRESS:
5449                 case IFA_LOCAL:
5450                         break;
5451                 default:
5452                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5453                         return -EINVAL;
5454                 }
5455         }
5456
5457         return 0;
5458 }
5459
5460 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5461                              struct netlink_ext_ack *extack)
5462 {
5463         struct net *tgt_net = sock_net(in_skb->sk);
5464         struct inet6_fill_args fillargs = {
5465                 .portid = NETLINK_CB(in_skb).portid,
5466                 .seq = nlh->nlmsg_seq,
5467                 .event = RTM_NEWADDR,
5468                 .flags = 0,
5469                 .netnsid = -1,
5470         };
5471         struct ifaddrmsg *ifm;
5472         struct nlattr *tb[IFA_MAX+1];
5473         struct in6_addr *addr = NULL, *peer;
5474         struct net_device *dev = NULL;
5475         struct inet6_ifaddr *ifa;
5476         struct sk_buff *skb;
5477         int err;
5478
5479         err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5480         if (err < 0)
5481                 return err;
5482
5483         if (tb[IFA_TARGET_NETNSID]) {
5484                 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5485
5486                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5487                                                   fillargs.netnsid);
5488                 if (IS_ERR(tgt_net))
5489                         return PTR_ERR(tgt_net);
5490         }
5491
5492         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5493         if (!addr)
5494                 return -EINVAL;
5495
5496         ifm = nlmsg_data(nlh);
5497         if (ifm->ifa_index)
5498                 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5499
5500         ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5501         if (!ifa) {
5502                 err = -EADDRNOTAVAIL;
5503                 goto errout;
5504         }
5505
5506         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5507         if (!skb) {
5508                 err = -ENOBUFS;
5509                 goto errout_ifa;
5510         }
5511
5512         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5513         if (err < 0) {
5514                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5515                 WARN_ON(err == -EMSGSIZE);
5516                 kfree_skb(skb);
5517                 goto errout_ifa;
5518         }
5519         err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5520 errout_ifa:
5521         in6_ifa_put(ifa);
5522 errout:
5523         dev_put(dev);
5524         if (fillargs.netnsid >= 0)
5525                 put_net(tgt_net);
5526
5527         return err;
5528 }
5529
5530 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5531 {
5532         struct sk_buff *skb;
5533         struct net *net = dev_net(ifa->idev->dev);
5534         struct inet6_fill_args fillargs = {
5535                 .portid = 0,
5536                 .seq = 0,
5537                 .event = event,
5538                 .flags = 0,
5539                 .netnsid = -1,
5540         };
5541         int err = -ENOBUFS;
5542
5543         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5544         if (!skb)
5545                 goto errout;
5546
5547         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5548         if (err < 0) {
5549                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5550                 WARN_ON(err == -EMSGSIZE);
5551                 kfree_skb(skb);
5552                 goto errout;
5553         }
5554         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5555         return;
5556 errout:
5557         if (err < 0)
5558                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5559 }
5560
5561 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5562                                 __s32 *array, int bytes)
5563 {
5564         BUG_ON(bytes < (DEVCONF_MAX * 4));
5565
5566         memset(array, 0, bytes);
5567         array[DEVCONF_FORWARDING] = cnf->forwarding;
5568         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5569         array[DEVCONF_MTU6] = cnf->mtu6;
5570         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5571         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5572         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5573         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5574         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5575         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5576                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5577         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5578                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5579         array[DEVCONF_RTR_SOLICIT_DELAY] =
5580                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5581         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5582         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5583                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5584         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5585                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5586         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5587         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5588         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5589         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5590         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5591         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5592         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5593         array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5594         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5595         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5596 #ifdef CONFIG_IPV6_ROUTER_PREF
5597         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5598         array[DEVCONF_RTR_PROBE_INTERVAL] =
5599                 jiffies_to_msecs(cnf->rtr_probe_interval);
5600 #ifdef CONFIG_IPV6_ROUTE_INFO
5601         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5602         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5603 #endif
5604 #endif
5605         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5606         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5607 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5608         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5609         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5610 #endif
5611 #ifdef CONFIG_IPV6_MROUTE
5612         array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5613 #endif
5614         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5615         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5616         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5617         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5618         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5619         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5620         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5621         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5622         /* we omit DEVCONF_STABLE_SECRET for now */
5623         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5624         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5625         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5626         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5627         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5628 #ifdef CONFIG_IPV6_SEG6_HMAC
5629         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5630 #endif
5631         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5632         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5633         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5634         array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5635         array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5636         array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5637         array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5638         array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5639         array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
5640         array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
5641         array[DEVCONF_ACCEPT_RA_MIN_LFT] = cnf->accept_ra_min_lft;
5642 }
5643
5644 static inline size_t inet6_ifla6_size(void)
5645 {
5646         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5647              + nla_total_size(sizeof(struct ifla_cacheinfo))
5648              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5649              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5650              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5651              + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5652              + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5653              + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5654              + 0;
5655 }
5656
5657 static inline size_t inet6_if_nlmsg_size(void)
5658 {
5659         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5660                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5661                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5662                + nla_total_size(4) /* IFLA_MTU */
5663                + nla_total_size(4) /* IFLA_LINK */
5664                + nla_total_size(1) /* IFLA_OPERSTATE */
5665                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5666 }
5667
5668 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5669                                         int bytes)
5670 {
5671         int i;
5672         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5673         BUG_ON(pad < 0);
5674
5675         /* Use put_unaligned() because stats may not be aligned for u64. */
5676         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5677         for (i = 1; i < ICMP6_MIB_MAX; i++)
5678                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5679
5680         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5681 }
5682
5683 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5684                                         int bytes, size_t syncpoff)
5685 {
5686         int i, c;
5687         u64 buff[IPSTATS_MIB_MAX];
5688         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5689
5690         BUG_ON(pad < 0);
5691
5692         memset(buff, 0, sizeof(buff));
5693         buff[0] = IPSTATS_MIB_MAX;
5694
5695         for_each_possible_cpu(c) {
5696                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5697                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5698         }
5699
5700         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5701         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5702 }
5703
5704 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5705                              int bytes)
5706 {
5707         switch (attrtype) {
5708         case IFLA_INET6_STATS:
5709                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5710                                      offsetof(struct ipstats_mib, syncp));
5711                 break;
5712         case IFLA_INET6_ICMP6STATS:
5713                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5714                 break;
5715         }
5716 }
5717
5718 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5719                                   u32 ext_filter_mask)
5720 {
5721         struct nlattr *nla;
5722         struct ifla_cacheinfo ci;
5723
5724         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5725                 goto nla_put_failure;
5726         ci.max_reasm_len = IPV6_MAXPLEN;
5727         ci.tstamp = cstamp_delta(idev->tstamp);
5728         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5729         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5730         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5731                 goto nla_put_failure;
5732         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5733         if (!nla)
5734                 goto nla_put_failure;
5735         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5736
5737         /* XXX - MC not implemented */
5738
5739         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5740                 return 0;
5741
5742         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5743         if (!nla)
5744                 goto nla_put_failure;
5745         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5746
5747         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5748         if (!nla)
5749                 goto nla_put_failure;
5750         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5751
5752         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5753         if (!nla)
5754                 goto nla_put_failure;
5755         read_lock_bh(&idev->lock);
5756         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5757         read_unlock_bh(&idev->lock);
5758
5759         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5760                 goto nla_put_failure;
5761
5762         if (idev->ra_mtu &&
5763             nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5764                 goto nla_put_failure;
5765
5766         return 0;
5767
5768 nla_put_failure:
5769         return -EMSGSIZE;
5770 }
5771
5772 static size_t inet6_get_link_af_size(const struct net_device *dev,
5773                                      u32 ext_filter_mask)
5774 {
5775         if (!__in6_dev_get(dev))
5776                 return 0;
5777
5778         return inet6_ifla6_size();
5779 }
5780
5781 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5782                               u32 ext_filter_mask)
5783 {
5784         struct inet6_dev *idev = __in6_dev_get(dev);
5785
5786         if (!idev)
5787                 return -ENODATA;
5788
5789         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5790                 return -EMSGSIZE;
5791
5792         return 0;
5793 }
5794
5795 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5796                              struct netlink_ext_ack *extack)
5797 {
5798         struct inet6_ifaddr *ifp;
5799         struct net_device *dev = idev->dev;
5800         bool clear_token, update_rs = false;
5801         struct in6_addr ll_addr;
5802
5803         ASSERT_RTNL();
5804
5805         if (!token)
5806                 return -EINVAL;
5807
5808         if (dev->flags & IFF_LOOPBACK) {
5809                 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5810                 return -EINVAL;
5811         }
5812
5813         if (dev->flags & IFF_NOARP) {
5814                 NL_SET_ERR_MSG_MOD(extack,
5815                                    "Device does not do neighbour discovery");
5816                 return -EINVAL;
5817         }
5818
5819         if (!ipv6_accept_ra(idev)) {
5820                 NL_SET_ERR_MSG_MOD(extack,
5821                                    "Router advertisement is disabled on device");
5822                 return -EINVAL;
5823         }
5824
5825         if (idev->cnf.rtr_solicits == 0) {
5826                 NL_SET_ERR_MSG(extack,
5827                                "Router solicitation is disabled on device");
5828                 return -EINVAL;
5829         }
5830
5831         write_lock_bh(&idev->lock);
5832
5833         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5834         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5835
5836         write_unlock_bh(&idev->lock);
5837
5838         clear_token = ipv6_addr_any(token);
5839         if (clear_token)
5840                 goto update_lft;
5841
5842         if (!idev->dead && (idev->if_flags & IF_READY) &&
5843             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5844                              IFA_F_OPTIMISTIC)) {
5845                 /* If we're not ready, then normal ifup will take care
5846                  * of this. Otherwise, we need to request our rs here.
5847                  */
5848                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5849                 update_rs = true;
5850         }
5851
5852 update_lft:
5853         write_lock_bh(&idev->lock);
5854
5855         if (update_rs) {
5856                 idev->if_flags |= IF_RS_SENT;
5857                 idev->rs_interval = rfc3315_s14_backoff_init(
5858                         idev->cnf.rtr_solicit_interval);
5859                 idev->rs_probes = 1;
5860                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5861         }
5862
5863         /* Well, that's kinda nasty ... */
5864         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5865                 spin_lock(&ifp->lock);
5866                 if (ifp->tokenized) {
5867                         ifp->valid_lft = 0;
5868                         ifp->prefered_lft = 0;
5869                 }
5870                 spin_unlock(&ifp->lock);
5871         }
5872
5873         write_unlock_bh(&idev->lock);
5874         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5875         addrconf_verify_rtnl(dev_net(dev));
5876         return 0;
5877 }
5878
5879 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5880         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5881         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5882         [IFLA_INET6_RA_MTU]             = { .type = NLA_REJECT,
5883                                             .reject_message =
5884                                                 "IFLA_INET6_RA_MTU can not be set" },
5885 };
5886
5887 static int check_addr_gen_mode(int mode)
5888 {
5889         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5890             mode != IN6_ADDR_GEN_MODE_NONE &&
5891             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5892             mode != IN6_ADDR_GEN_MODE_RANDOM)
5893                 return -EINVAL;
5894         return 1;
5895 }
5896
5897 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5898                                 int mode)
5899 {
5900         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5901             !idev->cnf.stable_secret.initialized &&
5902             !net->ipv6.devconf_dflt->stable_secret.initialized)
5903                 return -EINVAL;
5904         return 1;
5905 }
5906
5907 static int inet6_validate_link_af(const struct net_device *dev,
5908                                   const struct nlattr *nla,
5909                                   struct netlink_ext_ack *extack)
5910 {
5911         struct nlattr *tb[IFLA_INET6_MAX + 1];
5912         struct inet6_dev *idev = NULL;
5913         int err;
5914
5915         if (dev) {
5916                 idev = __in6_dev_get(dev);
5917                 if (!idev)
5918                         return -EAFNOSUPPORT;
5919         }
5920
5921         err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5922                                           inet6_af_policy, extack);
5923         if (err)
5924                 return err;
5925
5926         if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5927                 return -EINVAL;
5928
5929         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5930                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5931
5932                 if (check_addr_gen_mode(mode) < 0)
5933                         return -EINVAL;
5934                 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5935                         return -EINVAL;
5936         }
5937
5938         return 0;
5939 }
5940
5941 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5942                              struct netlink_ext_ack *extack)
5943 {
5944         struct inet6_dev *idev = __in6_dev_get(dev);
5945         struct nlattr *tb[IFLA_INET6_MAX + 1];
5946         int err;
5947
5948         if (!idev)
5949                 return -EAFNOSUPPORT;
5950
5951         if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5952                 return -EINVAL;
5953
5954         if (tb[IFLA_INET6_TOKEN]) {
5955                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5956                                         extack);
5957                 if (err)
5958                         return err;
5959         }
5960
5961         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5962                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5963
5964                 idev->cnf.addr_gen_mode = mode;
5965         }
5966
5967         return 0;
5968 }
5969
5970 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5971                              u32 portid, u32 seq, int event, unsigned int flags)
5972 {
5973         struct net_device *dev = idev->dev;
5974         struct ifinfomsg *hdr;
5975         struct nlmsghdr *nlh;
5976         void *protoinfo;
5977
5978         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5979         if (!nlh)
5980                 return -EMSGSIZE;
5981
5982         hdr = nlmsg_data(nlh);
5983         hdr->ifi_family = AF_INET6;
5984         hdr->__ifi_pad = 0;
5985         hdr->ifi_type = dev->type;
5986         hdr->ifi_index = dev->ifindex;
5987         hdr->ifi_flags = dev_get_flags(dev);
5988         hdr->ifi_change = 0;
5989
5990         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5991             (dev->addr_len &&
5992              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5993             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5994             (dev->ifindex != dev_get_iflink(dev) &&
5995              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5996             nla_put_u8(skb, IFLA_OPERSTATE,
5997                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5998                 goto nla_put_failure;
5999         protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6000         if (!protoinfo)
6001                 goto nla_put_failure;
6002
6003         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6004                 goto nla_put_failure;
6005
6006         nla_nest_end(skb, protoinfo);
6007         nlmsg_end(skb, nlh);
6008         return 0;
6009
6010 nla_put_failure:
6011         nlmsg_cancel(skb, nlh);
6012         return -EMSGSIZE;
6013 }
6014
6015 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6016                                    struct netlink_ext_ack *extack)
6017 {
6018         struct ifinfomsg *ifm;
6019
6020         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6021                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6022                 return -EINVAL;
6023         }
6024
6025         if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6026                 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6027                 return -EINVAL;
6028         }
6029
6030         ifm = nlmsg_data(nlh);
6031         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6032             ifm->ifi_change || ifm->ifi_index) {
6033                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6034                 return -EINVAL;
6035         }
6036
6037         return 0;
6038 }
6039
6040 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6041 {
6042         struct net *net = sock_net(skb->sk);
6043         int h, s_h;
6044         int idx = 0, s_idx;
6045         struct net_device *dev;
6046         struct inet6_dev *idev;
6047         struct hlist_head *head;
6048
6049         /* only requests using strict checking can pass data to
6050          * influence the dump
6051          */
6052         if (cb->strict_check) {
6053                 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6054
6055                 if (err < 0)
6056                         return err;
6057         }
6058
6059         s_h = cb->args[0];
6060         s_idx = cb->args[1];
6061
6062         rcu_read_lock();
6063         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6064                 idx = 0;
6065                 head = &net->dev_index_head[h];
6066                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
6067                         if (idx < s_idx)
6068                                 goto cont;
6069                         idev = __in6_dev_get(dev);
6070                         if (!idev)
6071                                 goto cont;
6072                         if (inet6_fill_ifinfo(skb, idev,
6073                                               NETLINK_CB(cb->skb).portid,
6074                                               cb->nlh->nlmsg_seq,
6075                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
6076                                 goto out;
6077 cont:
6078                         idx++;
6079                 }
6080         }
6081 out:
6082         rcu_read_unlock();
6083         cb->args[1] = idx;
6084         cb->args[0] = h;
6085
6086         return skb->len;
6087 }
6088
6089 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6090 {
6091         struct sk_buff *skb;
6092         struct net *net = dev_net(idev->dev);
6093         int err = -ENOBUFS;
6094
6095         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6096         if (!skb)
6097                 goto errout;
6098
6099         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6100         if (err < 0) {
6101                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6102                 WARN_ON(err == -EMSGSIZE);
6103                 kfree_skb(skb);
6104                 goto errout;
6105         }
6106         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6107         return;
6108 errout:
6109         if (err < 0)
6110                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6111 }
6112
6113 static inline size_t inet6_prefix_nlmsg_size(void)
6114 {
6115         return NLMSG_ALIGN(sizeof(struct prefixmsg))
6116                + nla_total_size(sizeof(struct in6_addr))
6117                + nla_total_size(sizeof(struct prefix_cacheinfo));
6118 }
6119
6120 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6121                              struct prefix_info *pinfo, u32 portid, u32 seq,
6122                              int event, unsigned int flags)
6123 {
6124         struct prefixmsg *pmsg;
6125         struct nlmsghdr *nlh;
6126         struct prefix_cacheinfo ci;
6127
6128         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6129         if (!nlh)
6130                 return -EMSGSIZE;
6131
6132         pmsg = nlmsg_data(nlh);
6133         pmsg->prefix_family = AF_INET6;
6134         pmsg->prefix_pad1 = 0;
6135         pmsg->prefix_pad2 = 0;
6136         pmsg->prefix_ifindex = idev->dev->ifindex;
6137         pmsg->prefix_len = pinfo->prefix_len;
6138         pmsg->prefix_type = pinfo->type;
6139         pmsg->prefix_pad3 = 0;
6140         pmsg->prefix_flags = 0;
6141         if (pinfo->onlink)
6142                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6143         if (pinfo->autoconf)
6144                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6145
6146         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6147                 goto nla_put_failure;
6148         ci.preferred_time = ntohl(pinfo->prefered);
6149         ci.valid_time = ntohl(pinfo->valid);
6150         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6151                 goto nla_put_failure;
6152         nlmsg_end(skb, nlh);
6153         return 0;
6154
6155 nla_put_failure:
6156         nlmsg_cancel(skb, nlh);
6157         return -EMSGSIZE;
6158 }
6159
6160 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6161                          struct prefix_info *pinfo)
6162 {
6163         struct sk_buff *skb;
6164         struct net *net = dev_net(idev->dev);
6165         int err = -ENOBUFS;
6166
6167         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6168         if (!skb)
6169                 goto errout;
6170
6171         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6172         if (err < 0) {
6173                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6174                 WARN_ON(err == -EMSGSIZE);
6175                 kfree_skb(skb);
6176                 goto errout;
6177         }
6178         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6179         return;
6180 errout:
6181         if (err < 0)
6182                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6183 }
6184
6185 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6186 {
6187         struct net *net = dev_net(ifp->idev->dev);
6188
6189         if (event)
6190                 ASSERT_RTNL();
6191
6192         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6193
6194         switch (event) {
6195         case RTM_NEWADDR:
6196                 /*
6197                  * If the address was optimistic we inserted the route at the
6198                  * start of our DAD process, so we don't need to do it again.
6199                  * If the device was taken down in the middle of the DAD
6200                  * cycle there is a race where we could get here without a
6201                  * host route, so nothing to insert. That will be fixed when
6202                  * the device is brought up.
6203                  */
6204                 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6205                         ip6_ins_rt(net, ifp->rt);
6206                 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6207                         pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6208                                 &ifp->addr, ifp->idev->dev->name);
6209                 }
6210
6211                 if (ifp->idev->cnf.forwarding)
6212                         addrconf_join_anycast(ifp);
6213                 if (!ipv6_addr_any(&ifp->peer_addr))
6214                         addrconf_prefix_route(&ifp->peer_addr, 128,
6215                                               ifp->rt_priority, ifp->idev->dev,
6216                                               0, 0, GFP_ATOMIC);
6217                 break;
6218         case RTM_DELADDR:
6219                 if (ifp->idev->cnf.forwarding)
6220                         addrconf_leave_anycast(ifp);
6221                 addrconf_leave_solict(ifp->idev, &ifp->addr);
6222                 if (!ipv6_addr_any(&ifp->peer_addr)) {
6223                         struct fib6_info *rt;
6224
6225                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6226                                                        ifp->idev->dev, 0, 0,
6227                                                        false);
6228                         if (rt)
6229                                 ip6_del_rt(net, rt, false);
6230                 }
6231                 if (ifp->rt) {
6232                         ip6_del_rt(net, ifp->rt, false);
6233                         ifp->rt = NULL;
6234                 }
6235                 rt_genid_bump_ipv6(net);
6236                 break;
6237         }
6238         atomic_inc(&net->ipv6.dev_addr_genid);
6239 }
6240
6241 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6242 {
6243         if (likely(ifp->idev->dead == 0))
6244                 __ipv6_ifa_notify(event, ifp);
6245 }
6246
6247 #ifdef CONFIG_SYSCTL
6248
6249 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6250                 void *buffer, size_t *lenp, loff_t *ppos)
6251 {
6252         int *valp = ctl->data;
6253         int val = *valp;
6254         loff_t pos = *ppos;
6255         struct ctl_table lctl;
6256         int ret;
6257
6258         /*
6259          * ctl->data points to idev->cnf.forwarding, we should
6260          * not modify it until we get the rtnl lock.
6261          */
6262         lctl = *ctl;
6263         lctl.data = &val;
6264
6265         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6266
6267         if (write)
6268                 ret = addrconf_fixup_forwarding(ctl, valp, val);
6269         if (ret)
6270                 *ppos = pos;
6271         return ret;
6272 }
6273
6274 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6275                 void *buffer, size_t *lenp, loff_t *ppos)
6276 {
6277         struct inet6_dev *idev = ctl->extra1;
6278         int min_mtu = IPV6_MIN_MTU;
6279         struct ctl_table lctl;
6280
6281         lctl = *ctl;
6282         lctl.extra1 = &min_mtu;
6283         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6284
6285         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6286 }
6287
6288 static void dev_disable_change(struct inet6_dev *idev)
6289 {
6290         struct netdev_notifier_info info;
6291
6292         if (!idev || !idev->dev)
6293                 return;
6294
6295         netdev_notifier_info_init(&info, idev->dev);
6296         if (idev->cnf.disable_ipv6)
6297                 addrconf_notify(NULL, NETDEV_DOWN, &info);
6298         else
6299                 addrconf_notify(NULL, NETDEV_UP, &info);
6300 }
6301
6302 static void addrconf_disable_change(struct net *net, __s32 newf)
6303 {
6304         struct net_device *dev;
6305         struct inet6_dev *idev;
6306
6307         for_each_netdev(net, dev) {
6308                 idev = __in6_dev_get(dev);
6309                 if (idev) {
6310                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6311                         idev->cnf.disable_ipv6 = newf;
6312                         if (changed)
6313                                 dev_disable_change(idev);
6314                 }
6315         }
6316 }
6317
6318 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6319 {
6320         struct net *net;
6321         int old;
6322
6323         if (!rtnl_trylock())
6324                 return restart_syscall();
6325
6326         net = (struct net *)table->extra2;
6327         old = *p;
6328         *p = newf;
6329
6330         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6331                 rtnl_unlock();
6332                 return 0;
6333         }
6334
6335         if (p == &net->ipv6.devconf_all->disable_ipv6) {
6336                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6337                 addrconf_disable_change(net, newf);
6338         } else if ((!newf) ^ (!old))
6339                 dev_disable_change((struct inet6_dev *)table->extra1);
6340
6341         rtnl_unlock();
6342         return 0;
6343 }
6344
6345 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6346                 void *buffer, size_t *lenp, loff_t *ppos)
6347 {
6348         int *valp = ctl->data;
6349         int val = *valp;
6350         loff_t pos = *ppos;
6351         struct ctl_table lctl;
6352         int ret;
6353
6354         /*
6355          * ctl->data points to idev->cnf.disable_ipv6, we should
6356          * not modify it until we get the rtnl lock.
6357          */
6358         lctl = *ctl;
6359         lctl.data = &val;
6360
6361         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6362
6363         if (write)
6364                 ret = addrconf_disable_ipv6(ctl, valp, val);
6365         if (ret)
6366                 *ppos = pos;
6367         return ret;
6368 }
6369
6370 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6371                 void *buffer, size_t *lenp, loff_t *ppos)
6372 {
6373         int *valp = ctl->data;
6374         int ret;
6375         int old, new;
6376
6377         old = *valp;
6378         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6379         new = *valp;
6380
6381         if (write && old != new) {
6382                 struct net *net = ctl->extra2;
6383
6384                 if (!rtnl_trylock())
6385                         return restart_syscall();
6386
6387                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6388                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6389                                                      NETCONFA_PROXY_NEIGH,
6390                                                      NETCONFA_IFINDEX_DEFAULT,
6391                                                      net->ipv6.devconf_dflt);
6392                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6393                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6394                                                      NETCONFA_PROXY_NEIGH,
6395                                                      NETCONFA_IFINDEX_ALL,
6396                                                      net->ipv6.devconf_all);
6397                 else {
6398                         struct inet6_dev *idev = ctl->extra1;
6399
6400                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6401                                                      NETCONFA_PROXY_NEIGH,
6402                                                      idev->dev->ifindex,
6403                                                      &idev->cnf);
6404                 }
6405                 rtnl_unlock();
6406         }
6407
6408         return ret;
6409 }
6410
6411 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6412                                          void *buffer, size_t *lenp,
6413                                          loff_t *ppos)
6414 {
6415         int ret = 0;
6416         u32 new_val;
6417         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6418         struct net *net = (struct net *)ctl->extra2;
6419         struct ctl_table tmp = {
6420                 .data = &new_val,
6421                 .maxlen = sizeof(new_val),
6422                 .mode = ctl->mode,
6423         };
6424
6425         if (!rtnl_trylock())
6426                 return restart_syscall();
6427
6428         new_val = *((u32 *)ctl->data);
6429
6430         ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6431         if (ret != 0)
6432                 goto out;
6433
6434         if (write) {
6435                 if (check_addr_gen_mode(new_val) < 0) {
6436                         ret = -EINVAL;
6437                         goto out;
6438                 }
6439
6440                 if (idev) {
6441                         if (check_stable_privacy(idev, net, new_val) < 0) {
6442                                 ret = -EINVAL;
6443                                 goto out;
6444                         }
6445
6446                         if (idev->cnf.addr_gen_mode != new_val) {
6447                                 idev->cnf.addr_gen_mode = new_val;
6448                                 addrconf_init_auto_addrs(idev->dev);
6449                         }
6450                 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6451                         struct net_device *dev;
6452
6453                         net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6454                         for_each_netdev(net, dev) {
6455                                 idev = __in6_dev_get(dev);
6456                                 if (idev &&
6457                                     idev->cnf.addr_gen_mode != new_val) {
6458                                         idev->cnf.addr_gen_mode = new_val;
6459                                         addrconf_init_auto_addrs(idev->dev);
6460                                 }
6461                         }
6462                 }
6463
6464                 *((u32 *)ctl->data) = new_val;
6465         }
6466
6467 out:
6468         rtnl_unlock();
6469
6470         return ret;
6471 }
6472
6473 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6474                                          void *buffer, size_t *lenp,
6475                                          loff_t *ppos)
6476 {
6477         int err;
6478         struct in6_addr addr;
6479         char str[IPV6_MAX_STRLEN];
6480         struct ctl_table lctl = *ctl;
6481         struct net *net = ctl->extra2;
6482         struct ipv6_stable_secret *secret = ctl->data;
6483
6484         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6485                 return -EIO;
6486
6487         lctl.maxlen = IPV6_MAX_STRLEN;
6488         lctl.data = str;
6489
6490         if (!rtnl_trylock())
6491                 return restart_syscall();
6492
6493         if (!write && !secret->initialized) {
6494                 err = -EIO;
6495                 goto out;
6496         }
6497
6498         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6499         if (err >= sizeof(str)) {
6500                 err = -EIO;
6501                 goto out;
6502         }
6503
6504         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6505         if (err || !write)
6506                 goto out;
6507
6508         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6509                 err = -EIO;
6510                 goto out;
6511         }
6512
6513         secret->initialized = true;
6514         secret->secret = addr;
6515
6516         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6517                 struct net_device *dev;
6518
6519                 for_each_netdev(net, dev) {
6520                         struct inet6_dev *idev = __in6_dev_get(dev);
6521
6522                         if (idev) {
6523                                 idev->cnf.addr_gen_mode =
6524                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6525                         }
6526                 }
6527         } else {
6528                 struct inet6_dev *idev = ctl->extra1;
6529
6530                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6531         }
6532
6533 out:
6534         rtnl_unlock();
6535
6536         return err;
6537 }
6538
6539 static
6540 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6541                                                 int write, void *buffer,
6542                                                 size_t *lenp,
6543                                                 loff_t *ppos)
6544 {
6545         int *valp = ctl->data;
6546         int val = *valp;
6547         loff_t pos = *ppos;
6548         struct ctl_table lctl;
6549         int ret;
6550
6551         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6552          * we should not modify it until we get the rtnl lock.
6553          */
6554         lctl = *ctl;
6555         lctl.data = &val;
6556
6557         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6558
6559         if (write)
6560                 ret = addrconf_fixup_linkdown(ctl, valp, val);
6561         if (ret)
6562                 *ppos = pos;
6563         return ret;
6564 }
6565
6566 static
6567 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6568 {
6569         if (rt) {
6570                 if (action)
6571                         rt->dst.flags |= DST_NOPOLICY;
6572                 else
6573                         rt->dst.flags &= ~DST_NOPOLICY;
6574         }
6575 }
6576
6577 static
6578 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6579 {
6580         struct inet6_ifaddr *ifa;
6581
6582         read_lock_bh(&idev->lock);
6583         list_for_each_entry(ifa, &idev->addr_list, if_list) {
6584                 spin_lock(&ifa->lock);
6585                 if (ifa->rt) {
6586                         /* host routes only use builtin fib6_nh */
6587                         struct fib6_nh *nh = ifa->rt->fib6_nh;
6588                         int cpu;
6589
6590                         rcu_read_lock();
6591                         ifa->rt->dst_nopolicy = val ? true : false;
6592                         if (nh->rt6i_pcpu) {
6593                                 for_each_possible_cpu(cpu) {
6594                                         struct rt6_info **rtp;
6595
6596                                         rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6597                                         addrconf_set_nopolicy(*rtp, val);
6598                                 }
6599                         }
6600                         rcu_read_unlock();
6601                 }
6602                 spin_unlock(&ifa->lock);
6603         }
6604         read_unlock_bh(&idev->lock);
6605 }
6606
6607 static
6608 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6609 {
6610         struct inet6_dev *idev;
6611         struct net *net;
6612
6613         if (!rtnl_trylock())
6614                 return restart_syscall();
6615
6616         *valp = val;
6617
6618         net = (struct net *)ctl->extra2;
6619         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6620                 rtnl_unlock();
6621                 return 0;
6622         }
6623
6624         if (valp == &net->ipv6.devconf_all->disable_policy)  {
6625                 struct net_device *dev;
6626
6627                 for_each_netdev(net, dev) {
6628                         idev = __in6_dev_get(dev);
6629                         if (idev)
6630                                 addrconf_disable_policy_idev(idev, val);
6631                 }
6632         } else {
6633                 idev = (struct inet6_dev *)ctl->extra1;
6634                 addrconf_disable_policy_idev(idev, val);
6635         }
6636
6637         rtnl_unlock();
6638         return 0;
6639 }
6640
6641 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6642                                    void *buffer, size_t *lenp, loff_t *ppos)
6643 {
6644         int *valp = ctl->data;
6645         int val = *valp;
6646         loff_t pos = *ppos;
6647         struct ctl_table lctl;
6648         int ret;
6649
6650         lctl = *ctl;
6651         lctl.data = &val;
6652         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6653
6654         if (write && (*valp != val))
6655                 ret = addrconf_disable_policy(ctl, valp, val);
6656
6657         if (ret)
6658                 *ppos = pos;
6659
6660         return ret;
6661 }
6662
6663 static int minus_one = -1;
6664 static const int two_five_five = 255;
6665 static u32 ioam6_if_id_max = U16_MAX;
6666
6667 static const struct ctl_table addrconf_sysctl[] = {
6668         {
6669                 .procname       = "forwarding",
6670                 .data           = &ipv6_devconf.forwarding,
6671                 .maxlen         = sizeof(int),
6672                 .mode           = 0644,
6673                 .proc_handler   = addrconf_sysctl_forward,
6674         },
6675         {
6676                 .procname       = "hop_limit",
6677                 .data           = &ipv6_devconf.hop_limit,
6678                 .maxlen         = sizeof(int),
6679                 .mode           = 0644,
6680                 .proc_handler   = proc_dointvec_minmax,
6681                 .extra1         = (void *)SYSCTL_ONE,
6682                 .extra2         = (void *)&two_five_five,
6683         },
6684         {
6685                 .procname       = "mtu",
6686                 .data           = &ipv6_devconf.mtu6,
6687                 .maxlen         = sizeof(int),
6688                 .mode           = 0644,
6689                 .proc_handler   = addrconf_sysctl_mtu,
6690         },
6691         {
6692                 .procname       = "accept_ra",
6693                 .data           = &ipv6_devconf.accept_ra,
6694                 .maxlen         = sizeof(int),
6695                 .mode           = 0644,
6696                 .proc_handler   = proc_dointvec,
6697         },
6698         {
6699                 .procname       = "accept_redirects",
6700                 .data           = &ipv6_devconf.accept_redirects,
6701                 .maxlen         = sizeof(int),
6702                 .mode           = 0644,
6703                 .proc_handler   = proc_dointvec,
6704         },
6705         {
6706                 .procname       = "autoconf",
6707                 .data           = &ipv6_devconf.autoconf,
6708                 .maxlen         = sizeof(int),
6709                 .mode           = 0644,
6710                 .proc_handler   = proc_dointvec,
6711         },
6712         {
6713                 .procname       = "dad_transmits",
6714                 .data           = &ipv6_devconf.dad_transmits,
6715                 .maxlen         = sizeof(int),
6716                 .mode           = 0644,
6717                 .proc_handler   = proc_dointvec,
6718         },
6719         {
6720                 .procname       = "router_solicitations",
6721                 .data           = &ipv6_devconf.rtr_solicits,
6722                 .maxlen         = sizeof(int),
6723                 .mode           = 0644,
6724                 .proc_handler   = proc_dointvec_minmax,
6725                 .extra1         = &minus_one,
6726         },
6727         {
6728                 .procname       = "router_solicitation_interval",
6729                 .data           = &ipv6_devconf.rtr_solicit_interval,
6730                 .maxlen         = sizeof(int),
6731                 .mode           = 0644,
6732                 .proc_handler   = proc_dointvec_jiffies,
6733         },
6734         {
6735                 .procname       = "router_solicitation_max_interval",
6736                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6737                 .maxlen         = sizeof(int),
6738                 .mode           = 0644,
6739                 .proc_handler   = proc_dointvec_jiffies,
6740         },
6741         {
6742                 .procname       = "router_solicitation_delay",
6743                 .data           = &ipv6_devconf.rtr_solicit_delay,
6744                 .maxlen         = sizeof(int),
6745                 .mode           = 0644,
6746                 .proc_handler   = proc_dointvec_jiffies,
6747         },
6748         {
6749                 .procname       = "force_mld_version",
6750                 .data           = &ipv6_devconf.force_mld_version,
6751                 .maxlen         = sizeof(int),
6752                 .mode           = 0644,
6753                 .proc_handler   = proc_dointvec,
6754         },
6755         {
6756                 .procname       = "mldv1_unsolicited_report_interval",
6757                 .data           =
6758                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6759                 .maxlen         = sizeof(int),
6760                 .mode           = 0644,
6761                 .proc_handler   = proc_dointvec_ms_jiffies,
6762         },
6763         {
6764                 .procname       = "mldv2_unsolicited_report_interval",
6765                 .data           =
6766                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6767                 .maxlen         = sizeof(int),
6768                 .mode           = 0644,
6769                 .proc_handler   = proc_dointvec_ms_jiffies,
6770         },
6771         {
6772                 .procname       = "use_tempaddr",
6773                 .data           = &ipv6_devconf.use_tempaddr,
6774                 .maxlen         = sizeof(int),
6775                 .mode           = 0644,
6776                 .proc_handler   = proc_dointvec,
6777         },
6778         {
6779                 .procname       = "temp_valid_lft",
6780                 .data           = &ipv6_devconf.temp_valid_lft,
6781                 .maxlen         = sizeof(int),
6782                 .mode           = 0644,
6783                 .proc_handler   = proc_dointvec,
6784         },
6785         {
6786                 .procname       = "temp_prefered_lft",
6787                 .data           = &ipv6_devconf.temp_prefered_lft,
6788                 .maxlen         = sizeof(int),
6789                 .mode           = 0644,
6790                 .proc_handler   = proc_dointvec,
6791         },
6792         {
6793                 .procname       = "regen_max_retry",
6794                 .data           = &ipv6_devconf.regen_max_retry,
6795                 .maxlen         = sizeof(int),
6796                 .mode           = 0644,
6797                 .proc_handler   = proc_dointvec,
6798         },
6799         {
6800                 .procname       = "max_desync_factor",
6801                 .data           = &ipv6_devconf.max_desync_factor,
6802                 .maxlen         = sizeof(int),
6803                 .mode           = 0644,
6804                 .proc_handler   = proc_dointvec,
6805         },
6806         {
6807                 .procname       = "max_addresses",
6808                 .data           = &ipv6_devconf.max_addresses,
6809                 .maxlen         = sizeof(int),
6810                 .mode           = 0644,
6811                 .proc_handler   = proc_dointvec,
6812         },
6813         {
6814                 .procname       = "accept_ra_defrtr",
6815                 .data           = &ipv6_devconf.accept_ra_defrtr,
6816                 .maxlen         = sizeof(int),
6817                 .mode           = 0644,
6818                 .proc_handler   = proc_dointvec,
6819         },
6820         {
6821                 .procname       = "ra_defrtr_metric",
6822                 .data           = &ipv6_devconf.ra_defrtr_metric,
6823                 .maxlen         = sizeof(u32),
6824                 .mode           = 0644,
6825                 .proc_handler   = proc_douintvec_minmax,
6826                 .extra1         = (void *)SYSCTL_ONE,
6827         },
6828         {
6829                 .procname       = "accept_ra_min_hop_limit",
6830                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6831                 .maxlen         = sizeof(int),
6832                 .mode           = 0644,
6833                 .proc_handler   = proc_dointvec,
6834         },
6835         {
6836                 .procname       = "accept_ra_min_lft",
6837                 .data           = &ipv6_devconf.accept_ra_min_lft,
6838                 .maxlen         = sizeof(int),
6839                 .mode           = 0644,
6840                 .proc_handler   = proc_dointvec,
6841         },
6842         {
6843                 .procname       = "accept_ra_pinfo",
6844                 .data           = &ipv6_devconf.accept_ra_pinfo,
6845                 .maxlen         = sizeof(int),
6846                 .mode           = 0644,
6847                 .proc_handler   = proc_dointvec,
6848         },
6849 #ifdef CONFIG_IPV6_ROUTER_PREF
6850         {
6851                 .procname       = "accept_ra_rtr_pref",
6852                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6853                 .maxlen         = sizeof(int),
6854                 .mode           = 0644,
6855                 .proc_handler   = proc_dointvec,
6856         },
6857         {
6858                 .procname       = "router_probe_interval",
6859                 .data           = &ipv6_devconf.rtr_probe_interval,
6860                 .maxlen         = sizeof(int),
6861                 .mode           = 0644,
6862                 .proc_handler   = proc_dointvec_jiffies,
6863         },
6864 #ifdef CONFIG_IPV6_ROUTE_INFO
6865         {
6866                 .procname       = "accept_ra_rt_info_min_plen",
6867                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6868                 .maxlen         = sizeof(int),
6869                 .mode           = 0644,
6870                 .proc_handler   = proc_dointvec,
6871         },
6872         {
6873                 .procname       = "accept_ra_rt_info_max_plen",
6874                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6875                 .maxlen         = sizeof(int),
6876                 .mode           = 0644,
6877                 .proc_handler   = proc_dointvec,
6878         },
6879 #endif
6880 #endif
6881         {
6882                 .procname       = "proxy_ndp",
6883                 .data           = &ipv6_devconf.proxy_ndp,
6884                 .maxlen         = sizeof(int),
6885                 .mode           = 0644,
6886                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6887         },
6888         {
6889                 .procname       = "accept_source_route",
6890                 .data           = &ipv6_devconf.accept_source_route,
6891                 .maxlen         = sizeof(int),
6892                 .mode           = 0644,
6893                 .proc_handler   = proc_dointvec,
6894         },
6895 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6896         {
6897                 .procname       = "optimistic_dad",
6898                 .data           = &ipv6_devconf.optimistic_dad,
6899                 .maxlen         = sizeof(int),
6900                 .mode           = 0644,
6901                 .proc_handler   = proc_dointvec,
6902         },
6903         {
6904                 .procname       = "use_optimistic",
6905                 .data           = &ipv6_devconf.use_optimistic,
6906                 .maxlen         = sizeof(int),
6907                 .mode           = 0644,
6908                 .proc_handler   = proc_dointvec,
6909         },
6910 #endif
6911 #ifdef CONFIG_IPV6_MROUTE
6912         {
6913                 .procname       = "mc_forwarding",
6914                 .data           = &ipv6_devconf.mc_forwarding,
6915                 .maxlen         = sizeof(int),
6916                 .mode           = 0444,
6917                 .proc_handler   = proc_dointvec,
6918         },
6919 #endif
6920         {
6921                 .procname       = "disable_ipv6",
6922                 .data           = &ipv6_devconf.disable_ipv6,
6923                 .maxlen         = sizeof(int),
6924                 .mode           = 0644,
6925                 .proc_handler   = addrconf_sysctl_disable,
6926         },
6927         {
6928                 .procname       = "accept_dad",
6929                 .data           = &ipv6_devconf.accept_dad,
6930                 .maxlen         = sizeof(int),
6931                 .mode           = 0644,
6932                 .proc_handler   = proc_dointvec,
6933         },
6934         {
6935                 .procname       = "force_tllao",
6936                 .data           = &ipv6_devconf.force_tllao,
6937                 .maxlen         = sizeof(int),
6938                 .mode           = 0644,
6939                 .proc_handler   = proc_dointvec
6940         },
6941         {
6942                 .procname       = "ndisc_notify",
6943                 .data           = &ipv6_devconf.ndisc_notify,
6944                 .maxlen         = sizeof(int),
6945                 .mode           = 0644,
6946                 .proc_handler   = proc_dointvec
6947         },
6948         {
6949                 .procname       = "suppress_frag_ndisc",
6950                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6951                 .maxlen         = sizeof(int),
6952                 .mode           = 0644,
6953                 .proc_handler   = proc_dointvec
6954         },
6955         {
6956                 .procname       = "accept_ra_from_local",
6957                 .data           = &ipv6_devconf.accept_ra_from_local,
6958                 .maxlen         = sizeof(int),
6959                 .mode           = 0644,
6960                 .proc_handler   = proc_dointvec,
6961         },
6962         {
6963                 .procname       = "accept_ra_mtu",
6964                 .data           = &ipv6_devconf.accept_ra_mtu,
6965                 .maxlen         = sizeof(int),
6966                 .mode           = 0644,
6967                 .proc_handler   = proc_dointvec,
6968         },
6969         {
6970                 .procname       = "stable_secret",
6971                 .data           = &ipv6_devconf.stable_secret,
6972                 .maxlen         = IPV6_MAX_STRLEN,
6973                 .mode           = 0600,
6974                 .proc_handler   = addrconf_sysctl_stable_secret,
6975         },
6976         {
6977                 .procname       = "use_oif_addrs_only",
6978                 .data           = &ipv6_devconf.use_oif_addrs_only,
6979                 .maxlen         = sizeof(int),
6980                 .mode           = 0644,
6981                 .proc_handler   = proc_dointvec,
6982         },
6983         {
6984                 .procname       = "ignore_routes_with_linkdown",
6985                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6986                 .maxlen         = sizeof(int),
6987                 .mode           = 0644,
6988                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6989         },
6990         {
6991                 .procname       = "drop_unicast_in_l2_multicast",
6992                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6993                 .maxlen         = sizeof(int),
6994                 .mode           = 0644,
6995                 .proc_handler   = proc_dointvec,
6996         },
6997         {
6998                 .procname       = "drop_unsolicited_na",
6999                 .data           = &ipv6_devconf.drop_unsolicited_na,
7000                 .maxlen         = sizeof(int),
7001                 .mode           = 0644,
7002                 .proc_handler   = proc_dointvec,
7003         },
7004         {
7005                 .procname       = "keep_addr_on_down",
7006                 .data           = &ipv6_devconf.keep_addr_on_down,
7007                 .maxlen         = sizeof(int),
7008                 .mode           = 0644,
7009                 .proc_handler   = proc_dointvec,
7010
7011         },
7012         {
7013                 .procname       = "seg6_enabled",
7014                 .data           = &ipv6_devconf.seg6_enabled,
7015                 .maxlen         = sizeof(int),
7016                 .mode           = 0644,
7017                 .proc_handler   = proc_dointvec,
7018         },
7019 #ifdef CONFIG_IPV6_SEG6_HMAC
7020         {
7021                 .procname       = "seg6_require_hmac",
7022                 .data           = &ipv6_devconf.seg6_require_hmac,
7023                 .maxlen         = sizeof(int),
7024                 .mode           = 0644,
7025                 .proc_handler   = proc_dointvec,
7026         },
7027 #endif
7028         {
7029                 .procname       = "enhanced_dad",
7030                 .data           = &ipv6_devconf.enhanced_dad,
7031                 .maxlen         = sizeof(int),
7032                 .mode           = 0644,
7033                 .proc_handler   = proc_dointvec,
7034         },
7035         {
7036                 .procname       = "addr_gen_mode",
7037                 .data           = &ipv6_devconf.addr_gen_mode,
7038                 .maxlen         = sizeof(int),
7039                 .mode           = 0644,
7040                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
7041         },
7042         {
7043                 .procname       = "disable_policy",
7044                 .data           = &ipv6_devconf.disable_policy,
7045                 .maxlen         = sizeof(int),
7046                 .mode           = 0644,
7047                 .proc_handler   = addrconf_sysctl_disable_policy,
7048         },
7049         {
7050                 .procname       = "ndisc_tclass",
7051                 .data           = &ipv6_devconf.ndisc_tclass,
7052                 .maxlen         = sizeof(int),
7053                 .mode           = 0644,
7054                 .proc_handler   = proc_dointvec_minmax,
7055                 .extra1         = (void *)SYSCTL_ZERO,
7056                 .extra2         = (void *)&two_five_five,
7057         },
7058         {
7059                 .procname       = "rpl_seg_enabled",
7060                 .data           = &ipv6_devconf.rpl_seg_enabled,
7061                 .maxlen         = sizeof(int),
7062                 .mode           = 0644,
7063                 .proc_handler   = proc_dointvec,
7064         },
7065         {
7066                 .procname       = "ioam6_enabled",
7067                 .data           = &ipv6_devconf.ioam6_enabled,
7068                 .maxlen         = sizeof(u8),
7069                 .mode           = 0644,
7070                 .proc_handler   = proc_dou8vec_minmax,
7071                 .extra1         = (void *)SYSCTL_ZERO,
7072                 .extra2         = (void *)SYSCTL_ONE,
7073         },
7074         {
7075                 .procname       = "ioam6_id",
7076                 .data           = &ipv6_devconf.ioam6_id,
7077                 .maxlen         = sizeof(u32),
7078                 .mode           = 0644,
7079                 .proc_handler   = proc_douintvec_minmax,
7080                 .extra1         = (void *)SYSCTL_ZERO,
7081                 .extra2         = (void *)&ioam6_if_id_max,
7082         },
7083         {
7084                 .procname       = "ioam6_id_wide",
7085                 .data           = &ipv6_devconf.ioam6_id_wide,
7086                 .maxlen         = sizeof(u32),
7087                 .mode           = 0644,
7088                 .proc_handler   = proc_douintvec,
7089         },
7090         {
7091                 .procname       = "ndisc_evict_nocarrier",
7092                 .data           = &ipv6_devconf.ndisc_evict_nocarrier,
7093                 .maxlen         = sizeof(u8),
7094                 .mode           = 0644,
7095                 .proc_handler   = proc_dou8vec_minmax,
7096                 .extra1         = (void *)SYSCTL_ZERO,
7097                 .extra2         = (void *)SYSCTL_ONE,
7098         },
7099         {
7100                 .procname       = "accept_untracked_na",
7101                 .data           = &ipv6_devconf.accept_untracked_na,
7102                 .maxlen         = sizeof(int),
7103                 .mode           = 0644,
7104                 .proc_handler   = proc_dointvec_minmax,
7105                 .extra1         = SYSCTL_ZERO,
7106                 .extra2         = SYSCTL_TWO,
7107         },
7108         {
7109                 /* sentinel */
7110         }
7111 };
7112
7113 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7114                 struct inet6_dev *idev, struct ipv6_devconf *p)
7115 {
7116         int i, ifindex;
7117         struct ctl_table *table;
7118         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7119
7120         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7121         if (!table)
7122                 goto out;
7123
7124         for (i = 0; table[i].data; i++) {
7125                 table[i].data += (char *)p - (char *)&ipv6_devconf;
7126                 /* If one of these is already set, then it is not safe to
7127                  * overwrite either of them: this makes proc_dointvec_minmax
7128                  * usable.
7129                  */
7130                 if (!table[i].extra1 && !table[i].extra2) {
7131                         table[i].extra1 = idev; /* embedded; no ref */
7132                         table[i].extra2 = net;
7133                 }
7134         }
7135
7136         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7137
7138         p->sysctl_header = register_net_sysctl_sz(net, path, table,
7139                                                   ARRAY_SIZE(addrconf_sysctl));
7140         if (!p->sysctl_header)
7141                 goto free;
7142
7143         if (!strcmp(dev_name, "all"))
7144                 ifindex = NETCONFA_IFINDEX_ALL;
7145         else if (!strcmp(dev_name, "default"))
7146                 ifindex = NETCONFA_IFINDEX_DEFAULT;
7147         else
7148                 ifindex = idev->dev->ifindex;
7149         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7150                                      ifindex, p);
7151         return 0;
7152
7153 free:
7154         kfree(table);
7155 out:
7156         return -ENOBUFS;
7157 }
7158
7159 static void __addrconf_sysctl_unregister(struct net *net,
7160                                          struct ipv6_devconf *p, int ifindex)
7161 {
7162         struct ctl_table *table;
7163
7164         if (!p->sysctl_header)
7165                 return;
7166
7167         table = p->sysctl_header->ctl_table_arg;
7168         unregister_net_sysctl_table(p->sysctl_header);
7169         p->sysctl_header = NULL;
7170         kfree(table);
7171
7172         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7173 }
7174
7175 static int addrconf_sysctl_register(struct inet6_dev *idev)
7176 {
7177         int err;
7178
7179         if (!sysctl_dev_name_is_allowed(idev->dev->name))
7180                 return -EINVAL;
7181
7182         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7183                                     &ndisc_ifinfo_sysctl_change);
7184         if (err)
7185                 return err;
7186         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7187                                          idev, &idev->cnf);
7188         if (err)
7189                 neigh_sysctl_unregister(idev->nd_parms);
7190
7191         return err;
7192 }
7193
7194 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7195 {
7196         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7197                                      idev->dev->ifindex);
7198         neigh_sysctl_unregister(idev->nd_parms);
7199 }
7200
7201
7202 #endif
7203
7204 static int __net_init addrconf_init_net(struct net *net)
7205 {
7206         int err = -ENOMEM;
7207         struct ipv6_devconf *all, *dflt;
7208
7209         spin_lock_init(&net->ipv6.addrconf_hash_lock);
7210         INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7211         net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7212                                            sizeof(struct hlist_head),
7213                                            GFP_KERNEL);
7214         if (!net->ipv6.inet6_addr_lst)
7215                 goto err_alloc_addr;
7216
7217         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7218         if (!all)
7219                 goto err_alloc_all;
7220
7221         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7222         if (!dflt)
7223                 goto err_alloc_dflt;
7224
7225         if (!net_eq(net, &init_net)) {
7226                 switch (net_inherit_devconf()) {
7227                 case 1:  /* copy from init_net */
7228                         memcpy(all, init_net.ipv6.devconf_all,
7229                                sizeof(ipv6_devconf));
7230                         memcpy(dflt, init_net.ipv6.devconf_dflt,
7231                                sizeof(ipv6_devconf_dflt));
7232                         break;
7233                 case 3: /* copy from the current netns */
7234                         memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7235                                sizeof(ipv6_devconf));
7236                         memcpy(dflt,
7237                                current->nsproxy->net_ns->ipv6.devconf_dflt,
7238                                sizeof(ipv6_devconf_dflt));
7239                         break;
7240                 case 0:
7241                 case 2:
7242                         /* use compiled values */
7243                         break;
7244                 }
7245         }
7246
7247         /* these will be inherited by all namespaces */
7248         dflt->autoconf = ipv6_defaults.autoconf;
7249         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7250
7251         dflt->stable_secret.initialized = false;
7252         all->stable_secret.initialized = false;
7253
7254         net->ipv6.devconf_all = all;
7255         net->ipv6.devconf_dflt = dflt;
7256
7257 #ifdef CONFIG_SYSCTL
7258         err = __addrconf_sysctl_register(net, "all", NULL, all);
7259         if (err < 0)
7260                 goto err_reg_all;
7261
7262         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7263         if (err < 0)
7264                 goto err_reg_dflt;
7265 #endif
7266         return 0;
7267
7268 #ifdef CONFIG_SYSCTL
7269 err_reg_dflt:
7270         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7271 err_reg_all:
7272         kfree(dflt);
7273         net->ipv6.devconf_dflt = NULL;
7274 #endif
7275 err_alloc_dflt:
7276         kfree(all);
7277         net->ipv6.devconf_all = NULL;
7278 err_alloc_all:
7279         kfree(net->ipv6.inet6_addr_lst);
7280 err_alloc_addr:
7281         return err;
7282 }
7283
7284 static void __net_exit addrconf_exit_net(struct net *net)
7285 {
7286         int i;
7287
7288 #ifdef CONFIG_SYSCTL
7289         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7290                                      NETCONFA_IFINDEX_DEFAULT);
7291         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7292                                      NETCONFA_IFINDEX_ALL);
7293 #endif
7294         kfree(net->ipv6.devconf_dflt);
7295         net->ipv6.devconf_dflt = NULL;
7296         kfree(net->ipv6.devconf_all);
7297         net->ipv6.devconf_all = NULL;
7298
7299         cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7300         /*
7301          *      Check hash table, then free it.
7302          */
7303         for (i = 0; i < IN6_ADDR_HSIZE; i++)
7304                 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7305
7306         kfree(net->ipv6.inet6_addr_lst);
7307         net->ipv6.inet6_addr_lst = NULL;
7308 }
7309
7310 static struct pernet_operations addrconf_ops = {
7311         .init = addrconf_init_net,
7312         .exit = addrconf_exit_net,
7313 };
7314
7315 static struct rtnl_af_ops inet6_ops __read_mostly = {
7316         .family           = AF_INET6,
7317         .fill_link_af     = inet6_fill_link_af,
7318         .get_link_af_size = inet6_get_link_af_size,
7319         .validate_link_af = inet6_validate_link_af,
7320         .set_link_af      = inet6_set_link_af,
7321 };
7322
7323 /*
7324  *      Init / cleanup code
7325  */
7326
7327 int __init addrconf_init(void)
7328 {
7329         struct inet6_dev *idev;
7330         int err;
7331
7332         err = ipv6_addr_label_init();
7333         if (err < 0) {
7334                 pr_crit("%s: cannot initialize default policy table: %d\n",
7335                         __func__, err);
7336                 goto out;
7337         }
7338
7339         err = register_pernet_subsys(&addrconf_ops);
7340         if (err < 0)
7341                 goto out_addrlabel;
7342
7343         addrconf_wq = create_workqueue("ipv6_addrconf");
7344         if (!addrconf_wq) {
7345                 err = -ENOMEM;
7346                 goto out_nowq;
7347         }
7348
7349         rtnl_lock();
7350         idev = ipv6_add_dev(blackhole_netdev);
7351         rtnl_unlock();
7352         if (IS_ERR(idev)) {
7353                 err = PTR_ERR(idev);
7354                 goto errlo;
7355         }
7356
7357         ip6_route_init_special_entries();
7358
7359         register_netdevice_notifier(&ipv6_dev_notf);
7360
7361         addrconf_verify(&init_net);
7362
7363         rtnl_af_register(&inet6_ops);
7364
7365         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7366                                    NULL, inet6_dump_ifinfo, 0);
7367         if (err < 0)
7368                 goto errout;
7369
7370         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7371                                    inet6_rtm_newaddr, NULL, 0);
7372         if (err < 0)
7373                 goto errout;
7374         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7375                                    inet6_rtm_deladdr, NULL, 0);
7376         if (err < 0)
7377                 goto errout;
7378         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7379                                    inet6_rtm_getaddr, inet6_dump_ifaddr,
7380                                    RTNL_FLAG_DOIT_UNLOCKED);
7381         if (err < 0)
7382                 goto errout;
7383         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7384                                    NULL, inet6_dump_ifmcaddr, 0);
7385         if (err < 0)
7386                 goto errout;
7387         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7388                                    NULL, inet6_dump_ifacaddr, 0);
7389         if (err < 0)
7390                 goto errout;
7391         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7392                                    inet6_netconf_get_devconf,
7393                                    inet6_netconf_dump_devconf,
7394                                    RTNL_FLAG_DOIT_UNLOCKED);
7395         if (err < 0)
7396                 goto errout;
7397         err = ipv6_addr_label_rtnl_register();
7398         if (err < 0)
7399                 goto errout;
7400
7401         return 0;
7402 errout:
7403         rtnl_unregister_all(PF_INET6);
7404         rtnl_af_unregister(&inet6_ops);
7405         unregister_netdevice_notifier(&ipv6_dev_notf);
7406 errlo:
7407         destroy_workqueue(addrconf_wq);
7408 out_nowq:
7409         unregister_pernet_subsys(&addrconf_ops);
7410 out_addrlabel:
7411         ipv6_addr_label_cleanup();
7412 out:
7413         return err;
7414 }
7415
7416 void addrconf_cleanup(void)
7417 {
7418         struct net_device *dev;
7419
7420         unregister_netdevice_notifier(&ipv6_dev_notf);
7421         unregister_pernet_subsys(&addrconf_ops);
7422         ipv6_addr_label_cleanup();
7423
7424         rtnl_af_unregister(&inet6_ops);
7425
7426         rtnl_lock();
7427
7428         /* clean dev list */
7429         for_each_netdev(&init_net, dev) {
7430                 if (__in6_dev_get(dev) == NULL)
7431                         continue;
7432                 addrconf_ifdown(dev, true);
7433         }
7434         addrconf_ifdown(init_net.loopback_dev, true);
7435
7436         rtnl_unlock();
7437
7438         destroy_workqueue(addrconf_wq);
7439 }