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 = (900000 + prandom_u32() % 200001) * (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 = (1900000 + prandom_u32() % 200001) * (u64)rt;
 116         do_div(tmp, 1000000);
 117         if ((s32)tmp > mrt) {
 118                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 119                 tmp = (900000 + prandom_u32() % 200001) * (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  *      Configured unicast address hash table
 151  */
 152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 153 static DEFINE_SPINLOCK(addrconf_hash_lock);
 154
 155 static void addrconf_verify(void);
 156 static void addrconf_verify_rtnl(void);
 157 static void addrconf_verify_work(struct work_struct *);
 158
 159 static struct workqueue_struct *addrconf_wq;
 160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 161
 162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 164
 165 static void addrconf_type_change(struct net_device *dev,
 166                                  unsigned long event);
 167 static int addrconf_ifdown(struct net_device *dev, bool unregister);
 168
 169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 170                                                   int plen,
 171                                                   const struct net_device *dev,
 172                                                   u32 flags, u32 noflags,
 173                                                   bool no_gw);
 174
 175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 176 static void addrconf_dad_work(struct work_struct *w);
 177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
 178                                    bool send_na);
 179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
 180 static void addrconf_rs_timer(struct timer_list *t);
 181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 183
 184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 185                                 struct prefix_info *pinfo);
 186
 187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 188         .forwarding             = 0,
 189         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 190         .mtu6                   = IPV6_MIN_MTU,
 191         .accept_ra              = 1,
 192         .accept_redirects       = 1,
 193         .autoconf               = 1,
 194         .force_mld_version      = 0,
 195         .mldv1_unsolicited_report_interval = 10 * HZ,
 196         .mldv2_unsolicited_report_interval = HZ,
 197         .dad_transmits          = 1,
 198         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 199         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 200         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 201         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 202         .use_tempaddr           = 0,
 203         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 204         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 205         .regen_max_retry        = REGEN_MAX_RETRY,
 206         .max_desync_factor      = MAX_DESYNC_FACTOR,
 207         .max_addresses          = IPV6_MAX_ADDRESSES,
 208         .accept_ra_defrtr       = 1,
 209         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 210         .accept_ra_from_local   = 0,
 211         .accept_ra_min_hop_limit= 1,
 212         .accept_ra_pinfo        = 1,
 213 #ifdef CONFIG_IPV6_ROUTER_PREF
 214         .accept_ra_rtr_pref     = 1,
 215         .rtr_probe_interval     = 60 * HZ,
 216 #ifdef CONFIG_IPV6_ROUTE_INFO
 217         .accept_ra_rt_info_min_plen = 0,
 218         .accept_ra_rt_info_max_plen = 0,
 219 #endif
 220 #endif
 221         .proxy_ndp              = 0,
 222         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 223         .disable_ipv6           = 0,
 224         .accept_dad             = 0,
 225         .suppress_frag_ndisc    = 1,
 226         .accept_ra_mtu          = 1,
 227         .stable_secret          = {
 228                 .initialized = false,
 229         },
 230         .use_oif_addrs_only     = 0,
 231         .ignore_routes_with_linkdown = 0,
 232         .keep_addr_on_down      = 0,
 233         .seg6_enabled           = 0,
 234 #ifdef CONFIG_IPV6_SEG6_HMAC
 235         .seg6_require_hmac      = 0,
 236 #endif
 237         .enhanced_dad           = 1,
 238         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 239         .disable_policy         = 0,
 240         .rpl_seg_enabled        = 0,
 241         .ioam6_enabled          = 0,
 242         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 243         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 244         .ndisc_evict_nocarrier  = 1,
 245 };
 246
 247 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 248         .forwarding             = 0,
 249         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 250         .mtu6                   = IPV6_MIN_MTU,
 251         .accept_ra              = 1,
 252         .accept_redirects       = 1,
 253         .autoconf               = 1,
 254         .force_mld_version      = 0,
 255         .mldv1_unsolicited_report_interval = 10 * HZ,
 256         .mldv2_unsolicited_report_interval = HZ,
 257         .dad_transmits          = 1,
 258         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 259         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 260         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 261         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 262         .use_tempaddr           = 0,
 263         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 264         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 265         .regen_max_retry        = REGEN_MAX_RETRY,
 266         .max_desync_factor      = MAX_DESYNC_FACTOR,
 267         .max_addresses          = IPV6_MAX_ADDRESSES,
 268         .accept_ra_defrtr       = 1,
 269         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 270         .accept_ra_from_local   = 0,
 271         .accept_ra_min_hop_limit= 1,
 272         .accept_ra_pinfo        = 1,
 273 #ifdef CONFIG_IPV6_ROUTER_PREF
 274         .accept_ra_rtr_pref     = 1,
 275         .rtr_probe_interval     = 60 * HZ,
 276 #ifdef CONFIG_IPV6_ROUTE_INFO
 277         .accept_ra_rt_info_min_plen = 0,
 278         .accept_ra_rt_info_max_plen = 0,
 279 #endif
 280 #endif
 281         .proxy_ndp              = 0,
 282         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 283         .disable_ipv6           = 0,
 284         .accept_dad             = 1,
 285         .suppress_frag_ndisc    = 1,
 286         .accept_ra_mtu          = 1,
 287         .stable_secret          = {
 288                 .initialized = false,
 289         },
 290         .use_oif_addrs_only     = 0,
 291         .ignore_routes_with_linkdown = 0,
 292         .keep_addr_on_down      = 0,
 293         .seg6_enabled           = 0,
 294 #ifdef CONFIG_IPV6_SEG6_HMAC
 295         .seg6_require_hmac      = 0,
 296 #endif
 297         .enhanced_dad           = 1,
 298         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 299         .disable_policy         = 0,
 300         .rpl_seg_enabled        = 0,
 301         .ioam6_enabled          = 0,
 302         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 303         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 304         .ndisc_evict_nocarrier  = 1,
 305 };
 306
 307 /* Check if link is ready: is it up and is a valid qdisc available */
 308 static inline bool addrconf_link_ready(const struct net_device *dev)
 309 {
 310         return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
 311 }
 312
 313 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 314 {
 315         if (del_timer(&idev->rs_timer))
 316                 __in6_dev_put(idev);
 317 }
 318
 319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 320 {
 321         if (cancel_delayed_work(&ifp->dad_work))
 322                 __in6_ifa_put(ifp);
 323 }
 324
 325 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 326                                   unsigned long when)
 327 {
 328         if (!timer_pending(&idev->rs_timer))
 329                 in6_dev_hold(idev);
 330         mod_timer(&idev->rs_timer, jiffies + when);
 331 }
 332
 333 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 334                                    unsigned long delay)
 335 {
 336         in6_ifa_hold(ifp);
 337         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 338                 in6_ifa_put(ifp);
 339 }
 340
 341 static int snmp6_alloc_dev(struct inet6_dev *idev)
 342 {
 343         int i;
 344
 345         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 346         if (!idev->stats.ipv6)
 347                 goto err_ip;
 348
 349         for_each_possible_cpu(i) {
 350                 struct ipstats_mib *addrconf_stats;
 351                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 352                 u64_stats_init(&addrconf_stats->syncp);
 353         }
 354
 355
 356         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 357                                         GFP_KERNEL);
 358         if (!idev->stats.icmpv6dev)
 359                 goto err_icmp;
 360         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 361                                            GFP_KERNEL);
 362         if (!idev->stats.icmpv6msgdev)
 363                 goto err_icmpmsg;
 364
 365         return 0;
 366
 367 err_icmpmsg:
 368         kfree(idev->stats.icmpv6dev);
 369 err_icmp:
 370         free_percpu(idev->stats.ipv6);
 371 err_ip:
 372         return -ENOMEM;
 373 }
 374
 375 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 376 {
 377         struct inet6_dev *ndev;
 378         int err = -ENOMEM;
 379
 380         ASSERT_RTNL();
 381
 382         if (dev->mtu < IPV6_MIN_MTU)
 383                 return ERR_PTR(-EINVAL);
 384
 385         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 386         if (!ndev)
 387                 return ERR_PTR(err);
 388
 389         rwlock_init(&ndev->lock);
 390         ndev->dev = dev;
 391         INIT_LIST_HEAD(&ndev->addr_list);
 392         timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
 393         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 394
 395         if (ndev->cnf.stable_secret.initialized)
 396                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 397
 398         ndev->cnf.mtu6 = dev->mtu;
 399         ndev->ra_mtu = 0;
 400         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 401         if (!ndev->nd_parms) {
 402                 kfree(ndev);
 403                 return ERR_PTR(err);
 404         }
 405         if (ndev->cnf.forwarding)
 406                 dev_disable_lro(dev);
 407         /* We refer to the device */
 408         dev_hold_track(dev, &ndev->dev_tracker, GFP_KERNEL);
 409
 410         if (snmp6_alloc_dev(ndev) < 0) {
 411                 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
 412                            __func__);
 413                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 414                 dev_put_track(dev, &ndev->dev_tracker);
 415                 kfree(ndev);
 416                 return ERR_PTR(err);
 417         }
 418
 419         if (snmp6_register_dev(ndev) < 0) {
 420                 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
 421                            __func__, dev->name);
 422                 goto err_release;
 423         }
 424
 425         /* One reference from device. */
 426         refcount_set(&ndev->refcnt, 1);
 427
 428         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 429                 ndev->cnf.accept_dad = -1;
 430
 431 #if IS_ENABLED(CONFIG_IPV6_SIT)
 432         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 433                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 434                 ndev->cnf.rtr_solicits = 0;
 435         }
 436 #endif
 437
 438         INIT_LIST_HEAD(&ndev->tempaddr_list);
 439         ndev->desync_factor = U32_MAX;
 440         if ((dev->flags&IFF_LOOPBACK) ||
 441             dev->type == ARPHRD_TUNNEL ||
 442             dev->type == ARPHRD_TUNNEL6 ||
 443             dev->type == ARPHRD_SIT ||
 444             dev->type == ARPHRD_NONE) {
 445                 ndev->cnf.use_tempaddr = -1;
 446         }
 447
 448         ndev->token = in6addr_any;
 449
 450         if (netif_running(dev) && addrconf_link_ready(dev))
 451                 ndev->if_flags |= IF_READY;
 452
 453         ipv6_mc_init_dev(ndev);
 454         ndev->tstamp = jiffies;
 455         err = addrconf_sysctl_register(ndev);
 456         if (err) {
 457                 ipv6_mc_destroy_dev(ndev);
 458                 snmp6_unregister_dev(ndev);
 459                 goto err_release;
 460         }
 461         /* protected by rtnl_lock */
 462         rcu_assign_pointer(dev->ip6_ptr, ndev);
 463
 464         /* Join interface-local all-node multicast group */
 465         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 466
 467         /* Join all-node multicast group */
 468         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 469
 470         /* Join all-router multicast group if forwarding is set */
 471         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 472                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 473
 474         return ndev;
 475
 476 err_release:
 477         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 478         ndev->dead = 1;
 479         in6_dev_finish_destroy(ndev);
 480         return ERR_PTR(err);
 481 }
 482
 483 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 484 {
 485         struct inet6_dev *idev;
 486
 487         ASSERT_RTNL();
 488
 489         idev = __in6_dev_get(dev);
 490         if (!idev) {
 491                 idev = ipv6_add_dev(dev);
 492                 if (IS_ERR(idev))
 493                         return idev;
 494         }
 495
 496         if (dev->flags&IFF_UP)
 497                 ipv6_mc_up(idev);
 498         return idev;
 499 }
 500
 501 static int inet6_netconf_msgsize_devconf(int type)
 502 {
 503         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 504                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 505         bool all = false;
 506
 507         if (type == NETCONFA_ALL)
 508                 all = true;
 509
 510         if (all || type == NETCONFA_FORWARDING)
 511                 size += nla_total_size(4);
 512 #ifdef CONFIG_IPV6_MROUTE
 513         if (all || type == NETCONFA_MC_FORWARDING)
 514                 size += nla_total_size(4);
 515 #endif
 516         if (all || type == NETCONFA_PROXY_NEIGH)
 517                 size += nla_total_size(4);
 518
 519         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 520                 size += nla_total_size(4);
 521
 522         return size;
 523 }
 524
 525 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 526                                       struct ipv6_devconf *devconf, u32 portid,
 527                                       u32 seq, int event, unsigned int flags,
 528                                       int type)
 529 {
 530         struct nlmsghdr  *nlh;
 531         struct netconfmsg *ncm;
 532         bool all = false;
 533
 534         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 535                         flags);
 536         if (!nlh)
 537                 return -EMSGSIZE;
 538
 539         if (type == NETCONFA_ALL)
 540                 all = true;
 541
 542         ncm = nlmsg_data(nlh);
 543         ncm->ncm_family = AF_INET6;
 544
 545         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 546                 goto nla_put_failure;
 547
 548         if (!devconf)
 549                 goto out;
 550
 551         if ((all || type == NETCONFA_FORWARDING) &&
 552             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 553                 goto nla_put_failure;
 554 #ifdef CONFIG_IPV6_MROUTE
 555         if ((all || type == NETCONFA_MC_FORWARDING) &&
 556             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 557                         devconf->mc_forwarding) < 0)
 558                 goto nla_put_failure;
 559 #endif
 560         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 561             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 562                 goto nla_put_failure;
 563
 564         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 565             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 566                         devconf->ignore_routes_with_linkdown) < 0)
 567                 goto nla_put_failure;
 568
 569 out:
 570         nlmsg_end(skb, nlh);
 571         return 0;
 572
 573 nla_put_failure:
 574         nlmsg_cancel(skb, nlh);
 575         return -EMSGSIZE;
 576 }
 577
 578 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 579                                   int ifindex, struct ipv6_devconf *devconf)
 580 {
 581         struct sk_buff *skb;
 582         int err = -ENOBUFS;
 583
 584         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 585         if (!skb)
 586                 goto errout;
 587
 588         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 589                                          event, 0, type);
 590         if (err < 0) {
 591                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 592                 WARN_ON(err == -EMSGSIZE);
 593                 kfree_skb(skb);
 594                 goto errout;
 595         }
 596         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 597         return;
 598 errout:
 599         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 600 }
 601
 602 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 603         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 604         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 605         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 606         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 607 };
 608
 609 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
 610                                        const struct nlmsghdr *nlh,
 611                                        struct nlattr **tb,
 612                                        struct netlink_ext_ack *extack)
 613 {
 614         int i, err;
 615
 616         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
 617                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
 618                 return -EINVAL;
 619         }
 620
 621         if (!netlink_strict_get_check(skb))
 622                 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
 623                                               tb, NETCONFA_MAX,
 624                                               devconf_ipv6_policy, extack);
 625
 626         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
 627                                             tb, NETCONFA_MAX,
 628                                             devconf_ipv6_policy, extack);
 629         if (err)
 630                 return err;
 631
 632         for (i = 0; i <= NETCONFA_MAX; i++) {
 633                 if (!tb[i])
 634                         continue;
 635
 636                 switch (i) {
 637                 case NETCONFA_IFINDEX:
 638                         break;
 639                 default:
 640                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
 641                         return -EINVAL;
 642                 }
 643         }
 644
 645         return 0;
 646 }
 647
 648 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 649                                      struct nlmsghdr *nlh,
 650                                      struct netlink_ext_ack *extack)
 651 {
 652         struct net *net = sock_net(in_skb->sk);
 653         struct nlattr *tb[NETCONFA_MAX+1];
 654         struct inet6_dev *in6_dev = NULL;
 655         struct net_device *dev = NULL;
 656         struct sk_buff *skb;
 657         struct ipv6_devconf *devconf;
 658         int ifindex;
 659         int err;
 660
 661         err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
 662         if (err < 0)
 663                 return err;
 664
 665         if (!tb[NETCONFA_IFINDEX])
 666                 return -EINVAL;
 667
 668         err = -EINVAL;
 669         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 670         switch (ifindex) {
 671         case NETCONFA_IFINDEX_ALL:
 672                 devconf = net->ipv6.devconf_all;
 673                 break;
 674         case NETCONFA_IFINDEX_DEFAULT:
 675                 devconf = net->ipv6.devconf_dflt;
 676                 break;
 677         default:
 678                 dev = dev_get_by_index(net, ifindex);
 679                 if (!dev)
 680                         return -EINVAL;
 681                 in6_dev = in6_dev_get(dev);
 682                 if (!in6_dev)
 683                         goto errout;
 684                 devconf = &in6_dev->cnf;
 685                 break;
 686         }
 687
 688         err = -ENOBUFS;
 689         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
 690         if (!skb)
 691                 goto errout;
 692
 693         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 694                                          NETLINK_CB(in_skb).portid,
 695                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 696                                          NETCONFA_ALL);
 697         if (err < 0) {
 698                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 699                 WARN_ON(err == -EMSGSIZE);
 700                 kfree_skb(skb);
 701                 goto errout;
 702         }
 703         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 704 errout:
 705         if (in6_dev)
 706                 in6_dev_put(in6_dev);
 707         dev_put(dev);
 708         return err;
 709 }
 710
 711 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 712                                       struct netlink_callback *cb)
 713 {
 714         const struct nlmsghdr *nlh = cb->nlh;
 715         struct net *net = sock_net(skb->sk);
 716         int h, s_h;
 717         int idx, s_idx;
 718         struct net_device *dev;
 719         struct inet6_dev *idev;
 720         struct hlist_head *head;
 721
 722         if (cb->strict_check) {
 723                 struct netlink_ext_ack *extack = cb->extack;
 724                 struct netconfmsg *ncm;
 725
 726                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
 727                         NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
 728                         return -EINVAL;
 729                 }
 730
 731                 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
 732                         NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
 733                         return -EINVAL;
 734                 }
 735         }
 736
 737         s_h = cb->args[0];
 738         s_idx = idx = cb->args[1];
 739
 740         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 741                 idx = 0;
 742                 head = &net->dev_index_head[h];
 743                 rcu_read_lock();
 744                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 745                           net->dev_base_seq;
 746                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 747                         if (idx < s_idx)
 748                                 goto cont;
 749                         idev = __in6_dev_get(dev);
 750                         if (!idev)
 751                                 goto cont;
 752
 753                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 754                                                        &idev->cnf,
 755                                                        NETLINK_CB(cb->skb).portid,
 756                                                        nlh->nlmsg_seq,
 757                                                        RTM_NEWNETCONF,
 758                                                        NLM_F_MULTI,
 759                                                        NETCONFA_ALL) < 0) {
 760                                 rcu_read_unlock();
 761                                 goto done;
 762                         }
 763                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 764 cont:
 765                         idx++;
 766                 }
 767                 rcu_read_unlock();
 768         }
 769         if (h == NETDEV_HASHENTRIES) {
 770                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 771                                                net->ipv6.devconf_all,
 772                                                NETLINK_CB(cb->skb).portid,
 773                                                nlh->nlmsg_seq,
 774                                                RTM_NEWNETCONF, NLM_F_MULTI,
 775                                                NETCONFA_ALL) < 0)
 776                         goto done;
 777                 else
 778                         h++;
 779         }
 780         if (h == NETDEV_HASHENTRIES + 1) {
 781                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 782                                                net->ipv6.devconf_dflt,
 783                                                NETLINK_CB(cb->skb).portid,
 784                                                nlh->nlmsg_seq,
 785                                                RTM_NEWNETCONF, NLM_F_MULTI,
 786                                                NETCONFA_ALL) < 0)
 787                         goto done;
 788                 else
 789                         h++;
 790         }
 791 done:
 792         cb->args[0] = h;
 793         cb->args[1] = idx;
 794
 795         return skb->len;
 796 }
 797
 798 #ifdef CONFIG_SYSCTL
 799 static void dev_forward_change(struct inet6_dev *idev)
 800 {
 801         struct net_device *dev;
 802         struct inet6_ifaddr *ifa;
 803
 804         if (!idev)
 805                 return;
 806         dev = idev->dev;
 807         if (idev->cnf.forwarding)
 808                 dev_disable_lro(dev);
 809         if (dev->flags & IFF_MULTICAST) {
 810                 if (idev->cnf.forwarding) {
 811                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 812                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 813                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 814                 } else {
 815                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 816                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 817                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 818                 }
 819         }
 820
 821         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 822                 if (ifa->flags&IFA_F_TENTATIVE)
 823                         continue;
 824                 if (idev->cnf.forwarding)
 825                         addrconf_join_anycast(ifa);
 826                 else
 827                         addrconf_leave_anycast(ifa);
 828         }
 829         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 830                                      NETCONFA_FORWARDING,
 831                                      dev->ifindex, &idev->cnf);
 832 }
 833
 834
 835 static void addrconf_forward_change(struct net *net, __s32 newf)
 836 {
 837         struct net_device *dev;
 838         struct inet6_dev *idev;
 839
 840         for_each_netdev(net, dev) {
 841                 idev = __in6_dev_get(dev);
 842                 if (idev) {
 843                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 844                         idev->cnf.forwarding = newf;
 845                         if (changed)
 846                                 dev_forward_change(idev);
 847                 }
 848         }
 849 }
 850
 851 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 852 {
 853         struct net *net;
 854         int old;
 855
 856         if (!rtnl_trylock())
 857                 return restart_syscall();
 858
 859         net = (struct net *)table->extra2;
 860         old = *p;
 861         *p = newf;
 862
 863         if (p == &net->ipv6.devconf_dflt->forwarding) {
 864                 if ((!newf) ^ (!old))
 865                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 866                                                      NETCONFA_FORWARDING,
 867                                                      NETCONFA_IFINDEX_DEFAULT,
 868                                                      net->ipv6.devconf_dflt);
 869                 rtnl_unlock();
 870                 return 0;
 871         }
 872
 873         if (p == &net->ipv6.devconf_all->forwarding) {
 874                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 875
 876                 net->ipv6.devconf_dflt->forwarding = newf;
 877                 if ((!newf) ^ (!old_dflt))
 878                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 879                                                      NETCONFA_FORWARDING,
 880                                                      NETCONFA_IFINDEX_DEFAULT,
 881                                                      net->ipv6.devconf_dflt);
 882
 883                 addrconf_forward_change(net, newf);
 884                 if ((!newf) ^ (!old))
 885                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 886                                                      NETCONFA_FORWARDING,
 887                                                      NETCONFA_IFINDEX_ALL,
 888                                                      net->ipv6.devconf_all);
 889         } else if ((!newf) ^ (!old))
 890                 dev_forward_change((struct inet6_dev *)table->extra1);
 891         rtnl_unlock();
 892
 893         if (newf)
 894                 rt6_purge_dflt_routers(net);
 895         return 1;
 896 }
 897
 898 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 899 {
 900         struct net_device *dev;
 901         struct inet6_dev *idev;
 902
 903         for_each_netdev(net, dev) {
 904                 idev = __in6_dev_get(dev);
 905                 if (idev) {
 906                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 907
 908                         idev->cnf.ignore_routes_with_linkdown = newf;
 909                         if (changed)
 910                                 inet6_netconf_notify_devconf(dev_net(dev),
 911                                                              RTM_NEWNETCONF,
 912                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 913                                                              dev->ifindex,
 914                                                              &idev->cnf);
 915                 }
 916         }
 917 }
 918
 919 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 920 {
 921         struct net *net;
 922         int old;
 923
 924         if (!rtnl_trylock())
 925                 return restart_syscall();
 926
 927         net = (struct net *)table->extra2;
 928         old = *p;
 929         *p = newf;
 930
 931         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 932                 if ((!newf) ^ (!old))
 933                         inet6_netconf_notify_devconf(net,
 934                                                      RTM_NEWNETCONF,
 935                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 936                                                      NETCONFA_IFINDEX_DEFAULT,
 937                                                      net->ipv6.devconf_dflt);
 938                 rtnl_unlock();
 939                 return 0;
 940         }
 941
 942         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 943                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 944                 addrconf_linkdown_change(net, newf);
 945                 if ((!newf) ^ (!old))
 946                         inet6_netconf_notify_devconf(net,
 947                                                      RTM_NEWNETCONF,
 948                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 949                                                      NETCONFA_IFINDEX_ALL,
 950                                                      net->ipv6.devconf_all);
 951         }
 952         rtnl_unlock();
 953
 954         return 1;
 955 }
 956
 957 #endif
 958
 959 /* Nobody refers to this ifaddr, destroy it */
 960 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 961 {
 962         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 963
 964 #ifdef NET_REFCNT_DEBUG
 965         pr_debug("%s\n", __func__);
 966 #endif
 967
 968         in6_dev_put(ifp->idev);
 969
 970         if (cancel_delayed_work(&ifp->dad_work))
 971                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 972                           ifp);
 973
 974         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 975                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 976                 return;
 977         }
 978
 979         kfree_rcu(ifp, rcu);
 980 }
 981
 982 static void
 983 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 984 {
 985         struct list_head *p;
 986         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 987
 988         /*
 989          * Each device address list is sorted in order of scope -
 990          * global before linklocal.
 991          */
 992         list_for_each(p, &idev->addr_list) {
 993                 struct inet6_ifaddr *ifa
 994                         = list_entry(p, struct inet6_ifaddr, if_list);
 995                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 996                         break;
 997         }
 998
 999         list_add_tail_rcu(&ifp->if_list, p);
1000 }
1001
1002 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1003 {
1004         u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1005
1006         return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1007 }
1008
1009 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1010                                struct net_device *dev, unsigned int hash)
1011 {
1012         struct inet6_ifaddr *ifp;
1013
1014         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1015                 if (!net_eq(dev_net(ifp->idev->dev), net))
1016                         continue;
1017                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1018                         if (!dev || ifp->idev->dev == dev)
1019                                 return true;
1020                 }
1021         }
1022         return false;
1023 }
1024
1025 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1026 {
1027         unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1028         int err = 0;
1029
1030         spin_lock(&addrconf_hash_lock);
1031
1032         /* Ignore adding duplicate addresses on an interface */
1033         if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1034                 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1035                 err = -EEXIST;
1036         } else {
1037                 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1038         }
1039
1040         spin_unlock(&addrconf_hash_lock);
1041
1042         return err;
1043 }
1044
1045 /* On success it returns ifp with increased reference count */
1046
1047 static struct inet6_ifaddr *
1048 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1049               bool can_block, struct netlink_ext_ack *extack)
1050 {
1051         gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1052         int addr_type = ipv6_addr_type(cfg->pfx);
1053         struct net *net = dev_net(idev->dev);
1054         struct inet6_ifaddr *ifa = NULL;
1055         struct fib6_info *f6i = NULL;
1056         int err = 0;
1057
1058         if (addr_type == IPV6_ADDR_ANY ||
1059             (addr_type & IPV6_ADDR_MULTICAST &&
1060              !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1061             (!(idev->dev->flags & IFF_LOOPBACK) &&
1062              !netif_is_l3_master(idev->dev) &&
1063              addr_type & IPV6_ADDR_LOOPBACK))
1064                 return ERR_PTR(-EADDRNOTAVAIL);
1065
1066         if (idev->dead) {
1067                 err = -ENODEV;                  /*XXX*/
1068                 goto out;
1069         }
1070
1071         if (idev->cnf.disable_ipv6) {
1072                 err = -EACCES;
1073                 goto out;
1074         }
1075
1076         /* validator notifier needs to be blocking;
1077          * do not call in atomic context
1078          */
1079         if (can_block) {
1080                 struct in6_validator_info i6vi = {
1081                         .i6vi_addr = *cfg->pfx,
1082                         .i6vi_dev = idev,
1083                         .extack = extack,
1084                 };
1085
1086                 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1087                 err = notifier_to_errno(err);
1088                 if (err < 0)
1089                         goto out;
1090         }
1091
1092         ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1093         if (!ifa) {
1094                 err = -ENOBUFS;
1095                 goto out;
1096         }
1097
1098         f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1099         if (IS_ERR(f6i)) {
1100                 err = PTR_ERR(f6i);
1101                 f6i = NULL;
1102                 goto out;
1103         }
1104
1105         if (net->ipv6.devconf_all->disable_policy ||
1106             idev->cnf.disable_policy)
1107                 f6i->dst_nopolicy = true;
1108
1109         neigh_parms_data_state_setall(idev->nd_parms);
1110
1111         ifa->addr = *cfg->pfx;
1112         if (cfg->peer_pfx)
1113                 ifa->peer_addr = *cfg->peer_pfx;
1114
1115         spin_lock_init(&ifa->lock);
1116         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1117         INIT_HLIST_NODE(&ifa->addr_lst);
1118         ifa->scope = cfg->scope;
1119         ifa->prefix_len = cfg->plen;
1120         ifa->rt_priority = cfg->rt_priority;
1121         ifa->flags = cfg->ifa_flags;
1122         /* No need to add the TENTATIVE flag for addresses with NODAD */
1123         if (!(cfg->ifa_flags & IFA_F_NODAD))
1124                 ifa->flags |= IFA_F_TENTATIVE;
1125         ifa->valid_lft = cfg->valid_lft;
1126         ifa->prefered_lft = cfg->preferred_lft;
1127         ifa->cstamp = ifa->tstamp = jiffies;
1128         ifa->tokenized = false;
1129
1130         ifa->rt = f6i;
1131
1132         ifa->idev = idev;
1133         in6_dev_hold(idev);
1134
1135         /* For caller */
1136         refcount_set(&ifa->refcnt, 1);
1137
1138         rcu_read_lock_bh();
1139
1140         err = ipv6_add_addr_hash(idev->dev, ifa);
1141         if (err < 0) {
1142                 rcu_read_unlock_bh();
1143                 goto out;
1144         }
1145
1146         write_lock(&idev->lock);
1147
1148         /* Add to inet6_dev unicast addr list. */
1149         ipv6_link_dev_addr(idev, ifa);
1150
1151         if (ifa->flags&IFA_F_TEMPORARY) {
1152                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1153                 in6_ifa_hold(ifa);
1154         }
1155
1156         in6_ifa_hold(ifa);
1157         write_unlock(&idev->lock);
1158
1159         rcu_read_unlock_bh();
1160
1161         inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1162 out:
1163         if (unlikely(err < 0)) {
1164                 fib6_info_release(f6i);
1165
1166                 if (ifa) {
1167                         if (ifa->idev)
1168                                 in6_dev_put(ifa->idev);
1169                         kfree(ifa);
1170                 }
1171                 ifa = ERR_PTR(err);
1172         }
1173
1174         return ifa;
1175 }
1176
1177 enum cleanup_prefix_rt_t {
1178         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1179         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1180         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1181 };
1182
1183 /*
1184  * Check, whether the prefix for ifp would still need a prefix route
1185  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1186  * constants.
1187  *
1188  * 1) we don't purge prefix if address was not permanent.
1189  *    prefix is managed by its own lifetime.
1190  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1191  * 3) if there are no addresses, delete prefix.
1192  * 4) if there are still other permanent address(es),
1193  *    corresponding prefix is still permanent.
1194  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1195  *    don't purge the prefix, assume user space is managing it.
1196  * 6) otherwise, update prefix lifetime to the
1197  *    longest valid lifetime among the corresponding
1198  *    addresses on the device.
1199  *    Note: subsequent RA will update lifetime.
1200  **/
1201 static enum cleanup_prefix_rt_t
1202 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1203 {
1204         struct inet6_ifaddr *ifa;
1205         struct inet6_dev *idev = ifp->idev;
1206         unsigned long lifetime;
1207         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1208
1209         *expires = jiffies;
1210
1211         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1212                 if (ifa == ifp)
1213                         continue;
1214                 if (ifa->prefix_len != ifp->prefix_len ||
1215                     !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1216                                        ifp->prefix_len))
1217                         continue;
1218                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1219                         return CLEANUP_PREFIX_RT_NOP;
1220
1221                 action = CLEANUP_PREFIX_RT_EXPIRE;
1222
1223                 spin_lock(&ifa->lock);
1224
1225                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1226                 /*
1227                  * Note: Because this address is
1228                  * not permanent, lifetime <
1229                  * LONG_MAX / HZ here.
1230                  */
1231                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1232                         *expires = ifa->tstamp + lifetime * HZ;
1233                 spin_unlock(&ifa->lock);
1234         }
1235
1236         return action;
1237 }
1238
1239 static void
1240 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1241                      bool del_rt, bool del_peer)
1242 {
1243         struct fib6_info *f6i;
1244
1245         f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1246                                         ifp->prefix_len,
1247                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
1248         if (f6i) {
1249                 if (del_rt)
1250                         ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1251                 else {
1252                         if (!(f6i->fib6_flags & RTF_EXPIRES))
1253                                 fib6_set_expires(f6i, expires);
1254                         fib6_info_release(f6i);
1255                 }
1256         }
1257 }
1258
1259
1260 /* This function wants to get referenced ifp and releases it before return */
1261
1262 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1263 {
1264         int state;
1265         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1266         unsigned long expires;
1267
1268         ASSERT_RTNL();
1269
1270         spin_lock_bh(&ifp->lock);
1271         state = ifp->state;
1272         ifp->state = INET6_IFADDR_STATE_DEAD;
1273         spin_unlock_bh(&ifp->lock);
1274
1275         if (state == INET6_IFADDR_STATE_DEAD)
1276                 goto out;
1277
1278         spin_lock_bh(&addrconf_hash_lock);
1279         hlist_del_init_rcu(&ifp->addr_lst);
1280         spin_unlock_bh(&addrconf_hash_lock);
1281
1282         write_lock_bh(&ifp->idev->lock);
1283
1284         if (ifp->flags&IFA_F_TEMPORARY) {
1285                 list_del(&ifp->tmp_list);
1286                 if (ifp->ifpub) {
1287                         in6_ifa_put(ifp->ifpub);
1288                         ifp->ifpub = NULL;
1289                 }
1290                 __in6_ifa_put(ifp);
1291         }
1292
1293         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1294                 action = check_cleanup_prefix_route(ifp, &expires);
1295
1296         list_del_rcu(&ifp->if_list);
1297         __in6_ifa_put(ifp);
1298
1299         write_unlock_bh(&ifp->idev->lock);
1300
1301         addrconf_del_dad_work(ifp);
1302
1303         ipv6_ifa_notify(RTM_DELADDR, ifp);
1304
1305         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1306
1307         if (action != CLEANUP_PREFIX_RT_NOP) {
1308                 cleanup_prefix_route(ifp, expires,
1309                         action == CLEANUP_PREFIX_RT_DEL, false);
1310         }
1311
1312         /* clean up prefsrc entries */
1313         rt6_remove_prefsrc(ifp);
1314 out:
1315         in6_ifa_put(ifp);
1316 }
1317
1318 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1319 {
1320         struct inet6_dev *idev = ifp->idev;
1321         unsigned long tmp_tstamp, age;
1322         unsigned long regen_advance;
1323         unsigned long now = jiffies;
1324         s32 cnf_temp_preferred_lft;
1325         struct inet6_ifaddr *ift;
1326         struct ifa6_config cfg;
1327         long max_desync_factor;
1328         struct in6_addr addr;
1329         int ret = 0;
1330
1331         write_lock_bh(&idev->lock);
1332
1333 retry:
1334         in6_dev_hold(idev);
1335         if (idev->cnf.use_tempaddr <= 0) {
1336                 write_unlock_bh(&idev->lock);
1337                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1338                 in6_dev_put(idev);
1339                 ret = -1;
1340                 goto out;
1341         }
1342         spin_lock_bh(&ifp->lock);
1343         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1344                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1345                 spin_unlock_bh(&ifp->lock);
1346                 write_unlock_bh(&idev->lock);
1347                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1348                         __func__);
1349                 in6_dev_put(idev);
1350                 ret = -1;
1351                 goto out;
1352         }
1353         in6_ifa_hold(ifp);
1354         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1355         ipv6_gen_rnd_iid(&addr);
1356
1357         age = (now - ifp->tstamp) / HZ;
1358
1359         regen_advance = idev->cnf.regen_max_retry *
1360                         idev->cnf.dad_transmits *
1361                         max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1362
1363         /* recalculate max_desync_factor each time and update
1364          * idev->desync_factor if it's larger
1365          */
1366         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1367         max_desync_factor = min_t(__u32,
1368                                   idev->cnf.max_desync_factor,
1369                                   cnf_temp_preferred_lft - regen_advance);
1370
1371         if (unlikely(idev->desync_factor > max_desync_factor)) {
1372                 if (max_desync_factor > 0) {
1373                         get_random_bytes(&idev->desync_factor,
1374                                          sizeof(idev->desync_factor));
1375                         idev->desync_factor %= max_desync_factor;
1376                 } else {
1377                         idev->desync_factor = 0;
1378                 }
1379         }
1380
1381         memset(&cfg, 0, sizeof(cfg));
1382         cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1383                               idev->cnf.temp_valid_lft + age);
1384         cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1385         cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1386
1387         cfg.plen = ifp->prefix_len;
1388         tmp_tstamp = ifp->tstamp;
1389         spin_unlock_bh(&ifp->lock);
1390
1391         write_unlock_bh(&idev->lock);
1392
1393         /* A temporary address is created only if this calculated Preferred
1394          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1395          * an implementation must not create a temporary address with a zero
1396          * Preferred Lifetime.
1397          * Use age calculation as in addrconf_verify to avoid unnecessary
1398          * temporary addresses being generated.
1399          */
1400         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1401         if (cfg.preferred_lft <= regen_advance + age) {
1402                 in6_ifa_put(ifp);
1403                 in6_dev_put(idev);
1404                 ret = -1;
1405                 goto out;
1406         }
1407
1408         cfg.ifa_flags = IFA_F_TEMPORARY;
1409         /* set in addrconf_prefix_rcv() */
1410         if (ifp->flags & IFA_F_OPTIMISTIC)
1411                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1412
1413         cfg.pfx = &addr;
1414         cfg.scope = ipv6_addr_scope(cfg.pfx);
1415
1416         ift = ipv6_add_addr(idev, &cfg, block, NULL);
1417         if (IS_ERR(ift)) {
1418                 in6_ifa_put(ifp);
1419                 in6_dev_put(idev);
1420                 pr_info("%s: retry temporary address regeneration\n", __func__);
1421                 write_lock_bh(&idev->lock);
1422                 goto retry;
1423         }
1424
1425         spin_lock_bh(&ift->lock);
1426         ift->ifpub = ifp;
1427         ift->cstamp = now;
1428         ift->tstamp = tmp_tstamp;
1429         spin_unlock_bh(&ift->lock);
1430
1431         addrconf_dad_start(ift);
1432         in6_ifa_put(ift);
1433         in6_dev_put(idev);
1434 out:
1435         return ret;
1436 }
1437
1438 /*
1439  *      Choose an appropriate source address (RFC3484)
1440  */
1441 enum {
1442         IPV6_SADDR_RULE_INIT = 0,
1443         IPV6_SADDR_RULE_LOCAL,
1444         IPV6_SADDR_RULE_SCOPE,
1445         IPV6_SADDR_RULE_PREFERRED,
1446 #ifdef CONFIG_IPV6_MIP6
1447         IPV6_SADDR_RULE_HOA,
1448 #endif
1449         IPV6_SADDR_RULE_OIF,
1450         IPV6_SADDR_RULE_LABEL,
1451         IPV6_SADDR_RULE_PRIVACY,
1452         IPV6_SADDR_RULE_ORCHID,
1453         IPV6_SADDR_RULE_PREFIX,
1454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1455         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1456 #endif
1457         IPV6_SADDR_RULE_MAX
1458 };
1459
1460 struct ipv6_saddr_score {
1461         int                     rule;
1462         int                     addr_type;
1463         struct inet6_ifaddr     *ifa;
1464         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1465         int                     scopedist;
1466         int                     matchlen;
1467 };
1468
1469 struct ipv6_saddr_dst {
1470         const struct in6_addr *addr;
1471         int ifindex;
1472         int scope;
1473         int label;
1474         unsigned int prefs;
1475 };
1476
1477 static inline int ipv6_saddr_preferred(int type)
1478 {
1479         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1480                 return 1;
1481         return 0;
1482 }
1483
1484 static bool ipv6_use_optimistic_addr(struct net *net,
1485                                      struct inet6_dev *idev)
1486 {
1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1488         if (!idev)
1489                 return false;
1490         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1491                 return false;
1492         if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1493                 return false;
1494
1495         return true;
1496 #else
1497         return false;
1498 #endif
1499 }
1500
1501 static bool ipv6_allow_optimistic_dad(struct net *net,
1502                                       struct inet6_dev *idev)
1503 {
1504 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1505         if (!idev)
1506                 return false;
1507         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1508                 return false;
1509
1510         return true;
1511 #else
1512         return false;
1513 #endif
1514 }
1515
1516 static int ipv6_get_saddr_eval(struct net *net,
1517                                struct ipv6_saddr_score *score,
1518                                struct ipv6_saddr_dst *dst,
1519                                int i)
1520 {
1521         int ret;
1522
1523         if (i <= score->rule) {
1524                 switch (i) {
1525                 case IPV6_SADDR_RULE_SCOPE:
1526                         ret = score->scopedist;
1527                         break;
1528                 case IPV6_SADDR_RULE_PREFIX:
1529                         ret = score->matchlen;
1530                         break;
1531                 default:
1532                         ret = !!test_bit(i, score->scorebits);
1533                 }
1534                 goto out;
1535         }
1536
1537         switch (i) {
1538         case IPV6_SADDR_RULE_INIT:
1539                 /* Rule 0: remember if hiscore is not ready yet */
1540                 ret = !!score->ifa;
1541                 break;
1542         case IPV6_SADDR_RULE_LOCAL:
1543                 /* Rule 1: Prefer same address */
1544                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1545                 break;
1546         case IPV6_SADDR_RULE_SCOPE:
1547                 /* Rule 2: Prefer appropriate scope
1548                  *
1549                  *      ret
1550                  *       ^
1551                  *    -1 |  d 15
1552                  *    ---+--+-+---> scope
1553                  *       |
1554                  *       |             d is scope of the destination.
1555                  *  B-d  |  \
1556                  *       |   \      <- smaller scope is better if
1557                  *  B-15 |    \        if scope is enough for destination.
1558                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1559                  * d-C-1 | /
1560                  *       |/         <- greater is better
1561                  *   -C  /             if scope is not enough for destination.
1562                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1563                  *
1564                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1565                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1566                  * Assume B = 0 and we get C > 29.
1567                  */
1568                 ret = __ipv6_addr_src_scope(score->addr_type);
1569                 if (ret >= dst->scope)
1570                         ret = -ret;
1571                 else
1572                         ret -= 128;     /* 30 is enough */
1573                 score->scopedist = ret;
1574                 break;
1575         case IPV6_SADDR_RULE_PREFERRED:
1576             {
1577                 /* Rule 3: Avoid deprecated and optimistic addresses */
1578                 u8 avoid = IFA_F_DEPRECATED;
1579
1580                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1581                         avoid |= IFA_F_OPTIMISTIC;
1582                 ret = ipv6_saddr_preferred(score->addr_type) ||
1583                       !(score->ifa->flags & avoid);
1584                 break;
1585             }
1586 #ifdef CONFIG_IPV6_MIP6
1587         case IPV6_SADDR_RULE_HOA:
1588             {
1589                 /* Rule 4: Prefer home address */
1590                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1591                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1592                 break;
1593             }
1594 #endif
1595         case IPV6_SADDR_RULE_OIF:
1596                 /* Rule 5: Prefer outgoing interface */
1597                 ret = (!dst->ifindex ||
1598                        dst->ifindex == score->ifa->idev->dev->ifindex);
1599                 break;
1600         case IPV6_SADDR_RULE_LABEL:
1601                 /* Rule 6: Prefer matching label */
1602                 ret = ipv6_addr_label(net,
1603                                       &score->ifa->addr, score->addr_type,
1604                                       score->ifa->idev->dev->ifindex) == dst->label;
1605                 break;
1606         case IPV6_SADDR_RULE_PRIVACY:
1607             {
1608                 /* Rule 7: Prefer public address
1609                  * Note: prefer temporary address if use_tempaddr >= 2
1610                  */
1611                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1612                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1613                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1614                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1615                 break;
1616             }
1617         case IPV6_SADDR_RULE_ORCHID:
1618                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1619                  *          non-ORCHID vs non-ORCHID
1620                  */
1621                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1622                         ipv6_addr_orchid(dst->addr));
1623                 break;
1624         case IPV6_SADDR_RULE_PREFIX:
1625                 /* Rule 8: Use longest matching prefix */
1626                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1627                 if (ret > score->ifa->prefix_len)
1628                         ret = score->ifa->prefix_len;
1629                 score->matchlen = ret;
1630                 break;
1631 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1632         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1633                 /* Optimistic addresses still have lower precedence than other
1634                  * preferred addresses.
1635                  */
1636                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1637                 break;
1638 #endif
1639         default:
1640                 ret = 0;
1641         }
1642
1643         if (ret)
1644                 __set_bit(i, score->scorebits);
1645         score->rule = i;
1646 out:
1647         return ret;
1648 }
1649
1650 static int __ipv6_dev_get_saddr(struct net *net,
1651                                 struct ipv6_saddr_dst *dst,
1652                                 struct inet6_dev *idev,
1653                                 struct ipv6_saddr_score *scores,
1654                                 int hiscore_idx)
1655 {
1656         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1657
1658         list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1659                 int i;
1660
1661                 /*
1662                  * - Tentative Address (RFC2462 section 5.4)
1663                  *  - A tentative address is not considered
1664                  *    "assigned to an interface" in the traditional
1665                  *    sense, unless it is also flagged as optimistic.
1666                  * - Candidate Source Address (section 4)
1667                  *  - In any case, anycast addresses, multicast
1668                  *    addresses, and the unspecified address MUST
1669                  *    NOT be included in a candidate set.
1670                  */
1671                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1672                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1673                         continue;
1674
1675                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1676
1677                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1678                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1679                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1680                                             idev->dev->name);
1681                         continue;
1682                 }
1683
1684                 score->rule = -1;
1685                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1686
1687                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1688                         int minihiscore, miniscore;
1689
1690                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1691                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1692
1693                         if (minihiscore > miniscore) {
1694                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1695                                     score->scopedist > 0) {
1696                                         /*
1697                                          * special case:
1698                                          * each remaining entry
1699                                          * has too small (not enough)
1700                                          * scope, because ifa entries
1701                                          * are sorted by their scope
1702                                          * values.
1703                                          */
1704                                         goto out;
1705                                 }
1706                                 break;
1707                         } else if (minihiscore < miniscore) {
1708                                 swap(hiscore, score);
1709                                 hiscore_idx = 1 - hiscore_idx;
1710
1711                                 /* restore our iterator */
1712                                 score->ifa = hiscore->ifa;
1713
1714                                 break;
1715                         }
1716                 }
1717         }
1718 out:
1719         return hiscore_idx;
1720 }
1721
1722 static int ipv6_get_saddr_master(struct net *net,
1723                                  const struct net_device *dst_dev,
1724                                  const struct net_device *master,
1725                                  struct ipv6_saddr_dst *dst,
1726                                  struct ipv6_saddr_score *scores,
1727                                  int hiscore_idx)
1728 {
1729         struct inet6_dev *idev;
1730
1731         idev = __in6_dev_get(dst_dev);
1732         if (idev)
1733                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1734                                                    scores, hiscore_idx);
1735
1736         idev = __in6_dev_get(master);
1737         if (idev)
1738                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1739                                                    scores, hiscore_idx);
1740
1741         return hiscore_idx;
1742 }
1743
1744 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1745                        const struct in6_addr *daddr, unsigned int prefs,
1746                        struct in6_addr *saddr)
1747 {
1748         struct ipv6_saddr_score scores[2], *hiscore;
1749         struct ipv6_saddr_dst dst;
1750         struct inet6_dev *idev;
1751         struct net_device *dev;
1752         int dst_type;
1753         bool use_oif_addr = false;
1754         int hiscore_idx = 0;
1755         int ret = 0;
1756
1757         dst_type = __ipv6_addr_type(daddr);
1758         dst.addr = daddr;
1759         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1760         dst.scope = __ipv6_addr_src_scope(dst_type);
1761         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1762         dst.prefs = prefs;
1763
1764         scores[hiscore_idx].rule = -1;
1765         scores[hiscore_idx].ifa = NULL;
1766
1767         rcu_read_lock();
1768
1769         /* Candidate Source Address (section 4)
1770          *  - multicast and link-local destination address,
1771          *    the set of candidate source address MUST only
1772          *    include addresses assigned to interfaces
1773          *    belonging to the same link as the outgoing
1774          *    interface.
1775          * (- For site-local destination addresses, the
1776          *    set of candidate source addresses MUST only
1777          *    include addresses assigned to interfaces
1778          *    belonging to the same site as the outgoing
1779          *    interface.)
1780          *  - "It is RECOMMENDED that the candidate source addresses
1781          *    be the set of unicast addresses assigned to the
1782          *    interface that will be used to send to the destination
1783          *    (the 'outgoing' interface)." (RFC 6724)
1784          */
1785         if (dst_dev) {
1786                 idev = __in6_dev_get(dst_dev);
1787                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1788                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1789                     (idev && idev->cnf.use_oif_addrs_only)) {
1790                         use_oif_addr = true;
1791                 }
1792         }
1793
1794         if (use_oif_addr) {
1795                 if (idev)
1796                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1797         } else {
1798                 const struct net_device *master;
1799                 int master_idx = 0;
1800
1801                 /* if dst_dev exists and is enslaved to an L3 device, then
1802                  * prefer addresses from dst_dev and then the master over
1803                  * any other enslaved devices in the L3 domain.
1804                  */
1805                 master = l3mdev_master_dev_rcu(dst_dev);
1806                 if (master) {
1807                         master_idx = master->ifindex;
1808
1809                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1810                                                             master, &dst,
1811                                                             scores, hiscore_idx);
1812
1813                         if (scores[hiscore_idx].ifa)
1814                                 goto out;
1815                 }
1816
1817                 for_each_netdev_rcu(net, dev) {
1818                         /* only consider addresses on devices in the
1819                          * same L3 domain
1820                          */
1821                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1822                                 continue;
1823                         idev = __in6_dev_get(dev);
1824                         if (!idev)
1825                                 continue;
1826                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1827                 }
1828         }
1829
1830 out:
1831         hiscore = &scores[hiscore_idx];
1832         if (!hiscore->ifa)
1833                 ret = -EADDRNOTAVAIL;
1834         else
1835                 *saddr = hiscore->ifa->addr;
1836
1837         rcu_read_unlock();
1838         return ret;
1839 }
1840 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1841
1842 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1843                       u32 banned_flags)
1844 {
1845         struct inet6_ifaddr *ifp;
1846         int err = -EADDRNOTAVAIL;
1847
1848         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1849                 if (ifp->scope > IFA_LINK)
1850                         break;
1851                 if (ifp->scope == IFA_LINK &&
1852                     !(ifp->flags & banned_flags)) {
1853                         *addr = ifp->addr;
1854                         err = 0;
1855                         break;
1856                 }
1857         }
1858         return err;
1859 }
1860
1861 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1862                     u32 banned_flags)
1863 {
1864         struct inet6_dev *idev;
1865         int err = -EADDRNOTAVAIL;
1866
1867         rcu_read_lock();
1868         idev = __in6_dev_get(dev);
1869         if (idev) {
1870                 read_lock_bh(&idev->lock);
1871                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1872                 read_unlock_bh(&idev->lock);
1873         }
1874         rcu_read_unlock();
1875         return err;
1876 }
1877
1878 static int ipv6_count_addresses(const struct inet6_dev *idev)
1879 {
1880         const struct inet6_ifaddr *ifp;
1881         int cnt = 0;
1882
1883         rcu_read_lock();
1884         list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1885                 cnt++;
1886         rcu_read_unlock();
1887         return cnt;
1888 }
1889
1890 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1891                   const struct net_device *dev, int strict)
1892 {
1893         return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1894                                        strict, IFA_F_TENTATIVE);
1895 }
1896 EXPORT_SYMBOL(ipv6_chk_addr);
1897
1898 /* device argument is used to find the L3 domain of interest. If
1899  * skip_dev_check is set, then the ifp device is not checked against
1900  * the passed in dev argument. So the 2 cases for addresses checks are:
1901  *   1. does the address exist in the L3 domain that dev is part of
1902  *      (skip_dev_check = true), or
1903  *
1904  *   2. does the address exist on the specific device
1905  *      (skip_dev_check = false)
1906  */
1907 static struct net_device *
1908 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1909                           const struct net_device *dev, bool skip_dev_check,
1910                           int strict, u32 banned_flags)
1911 {
1912         unsigned int hash = inet6_addr_hash(net, addr);
1913         struct net_device *l3mdev, *ndev;
1914         struct inet6_ifaddr *ifp;
1915         u32 ifp_flags;
1916
1917         rcu_read_lock();
1918
1919         l3mdev = l3mdev_master_dev_rcu(dev);
1920         if (skip_dev_check)
1921                 dev = NULL;
1922
1923         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1924                 ndev = ifp->idev->dev;
1925                 if (!net_eq(dev_net(ndev), net))
1926                         continue;
1927
1928                 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1929                         continue;
1930
1931                 /* Decouple optimistic from tentative for evaluation here.
1932                  * Ban optimistic addresses explicitly, when required.
1933                  */
1934                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1935                             ? (ifp->flags&~IFA_F_TENTATIVE)
1936                             : ifp->flags;
1937                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1938                     !(ifp_flags&banned_flags) &&
1939                     (!dev || ndev == dev ||
1940                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1941                         rcu_read_unlock();
1942                         return ndev;
1943                 }
1944         }
1945
1946         rcu_read_unlock();
1947         return NULL;
1948 }
1949
1950 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1951                             const struct net_device *dev, bool skip_dev_check,
1952                             int strict, u32 banned_flags)
1953 {
1954         return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1955                                          strict, banned_flags) ? 1 : 0;
1956 }
1957 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1958
1959
1960 /* Compares an address/prefix_len with addresses on device @dev.
1961  * If one is found it returns true.
1962  */
1963 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1964         const unsigned int prefix_len, struct net_device *dev)
1965 {
1966         const struct inet6_ifaddr *ifa;
1967         const struct inet6_dev *idev;
1968         bool ret = false;
1969
1970         rcu_read_lock();
1971         idev = __in6_dev_get(dev);
1972         if (idev) {
1973                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1974                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1975                         if (ret)
1976                                 break;
1977                 }
1978         }
1979         rcu_read_unlock();
1980
1981         return ret;
1982 }
1983 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1984
1985 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1986 {
1987         const struct inet6_ifaddr *ifa;
1988         const struct inet6_dev *idev;
1989         int     onlink;
1990
1991         onlink = 0;
1992         rcu_read_lock();
1993         idev = __in6_dev_get(dev);
1994         if (idev) {
1995                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1996                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1997                                                    ifa->prefix_len);
1998                         if (onlink)
1999                                 break;
2000                 }
2001         }
2002         rcu_read_unlock();
2003         return onlink;
2004 }
2005 EXPORT_SYMBOL(ipv6_chk_prefix);
2006
2007 /**
2008  * ipv6_dev_find - find the first device with a given source address.
2009  * @net: the net namespace
2010  * @addr: the source address
2011  * @dev: used to find the L3 domain of interest
2012  *
2013  * The caller should be protected by RCU, or RTNL.
2014  */
2015 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2016                                  struct net_device *dev)
2017 {
2018         return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2019                                          IFA_F_TENTATIVE);
2020 }
2021 EXPORT_SYMBOL(ipv6_dev_find);
2022
2023 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2024                                      struct net_device *dev, int strict)
2025 {
2026         unsigned int hash = inet6_addr_hash(net, addr);
2027         struct inet6_ifaddr *ifp, *result = NULL;
2028
2029         rcu_read_lock();
2030         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2031                 if (!net_eq(dev_net(ifp->idev->dev), net))
2032                         continue;
2033                 if (ipv6_addr_equal(&ifp->addr, addr)) {
2034                         if (!dev || ifp->idev->dev == dev ||
2035                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2036                                 result = ifp;
2037                                 in6_ifa_hold(ifp);
2038                                 break;
2039                         }
2040                 }
2041         }
2042         rcu_read_unlock();
2043
2044         return result;
2045 }
2046
2047 /* Gets referenced address, destroys ifaddr */
2048
2049 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2050 {
2051         if (dad_failed)
2052                 ifp->flags |= IFA_F_DADFAILED;
2053
2054         if (ifp->flags&IFA_F_TEMPORARY) {
2055                 struct inet6_ifaddr *ifpub;
2056                 spin_lock_bh(&ifp->lock);
2057                 ifpub = ifp->ifpub;
2058                 if (ifpub) {
2059                         in6_ifa_hold(ifpub);
2060                         spin_unlock_bh(&ifp->lock);
2061                         ipv6_create_tempaddr(ifpub, true);
2062                         in6_ifa_put(ifpub);
2063                 } else {
2064                         spin_unlock_bh(&ifp->lock);
2065                 }
2066                 ipv6_del_addr(ifp);
2067         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2068                 spin_lock_bh(&ifp->lock);
2069                 addrconf_del_dad_work(ifp);
2070                 ifp->flags |= IFA_F_TENTATIVE;
2071                 if (dad_failed)
2072                         ifp->flags &= ~IFA_F_OPTIMISTIC;
2073                 spin_unlock_bh(&ifp->lock);
2074                 if (dad_failed)
2075                         ipv6_ifa_notify(0, ifp);
2076                 in6_ifa_put(ifp);
2077         } else {
2078                 ipv6_del_addr(ifp);
2079         }
2080 }
2081
2082 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2083 {
2084         int err = -ENOENT;
2085
2086         spin_lock_bh(&ifp->lock);
2087         if (ifp->state == INET6_IFADDR_STATE_DAD) {
2088                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2089                 err = 0;
2090         }
2091         spin_unlock_bh(&ifp->lock);
2092
2093         return err;
2094 }
2095
2096 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2097 {
2098         struct inet6_dev *idev = ifp->idev;
2099         struct net *net = dev_net(ifp->idev->dev);
2100
2101         if (addrconf_dad_end(ifp)) {
2102                 in6_ifa_put(ifp);
2103                 return;
2104         }
2105
2106         net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2107                              ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2108
2109         spin_lock_bh(&ifp->lock);
2110
2111         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2112                 struct in6_addr new_addr;
2113                 struct inet6_ifaddr *ifp2;
2114                 int retries = ifp->stable_privacy_retry + 1;
2115                 struct ifa6_config cfg = {
2116                         .pfx = &new_addr,
2117                         .plen = ifp->prefix_len,
2118                         .ifa_flags = ifp->flags,
2119                         .valid_lft = ifp->valid_lft,
2120                         .preferred_lft = ifp->prefered_lft,
2121                         .scope = ifp->scope,
2122                 };
2123
2124                 if (retries > net->ipv6.sysctl.idgen_retries) {
2125                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2126                                              ifp->idev->dev->name);
2127                         goto errdad;
2128                 }
2129
2130                 new_addr = ifp->addr;
2131                 if (ipv6_generate_stable_address(&new_addr, retries,
2132                                                  idev))
2133                         goto errdad;
2134
2135                 spin_unlock_bh(&ifp->lock);
2136
2137                 if (idev->cnf.max_addresses &&
2138                     ipv6_count_addresses(idev) >=
2139                     idev->cnf.max_addresses)
2140                         goto lock_errdad;
2141
2142                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2143                                      ifp->idev->dev->name);
2144
2145                 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2146                 if (IS_ERR(ifp2))
2147                         goto lock_errdad;
2148
2149                 spin_lock_bh(&ifp2->lock);
2150                 ifp2->stable_privacy_retry = retries;
2151                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2152                 spin_unlock_bh(&ifp2->lock);
2153
2154                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2155                 in6_ifa_put(ifp2);
2156 lock_errdad:
2157                 spin_lock_bh(&ifp->lock);
2158         }
2159
2160 errdad:
2161         /* transition from _POSTDAD to _ERRDAD */
2162         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2163         spin_unlock_bh(&ifp->lock);
2164
2165         addrconf_mod_dad_work(ifp, 0);
2166         in6_ifa_put(ifp);
2167 }
2168
2169 /* Join to solicited addr multicast group.
2170  * caller must hold RTNL */
2171 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2172 {
2173         struct in6_addr maddr;
2174
2175         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2176                 return;
2177
2178         addrconf_addr_solict_mult(addr, &maddr);
2179         ipv6_dev_mc_inc(dev, &maddr);
2180 }
2181
2182 /* caller must hold RTNL */
2183 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2184 {
2185         struct in6_addr maddr;
2186
2187         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2188                 return;
2189
2190         addrconf_addr_solict_mult(addr, &maddr);
2191         __ipv6_dev_mc_dec(idev, &maddr);
2192 }
2193
2194 /* caller must hold RTNL */
2195 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2196 {
2197         struct in6_addr addr;
2198
2199         if (ifp->prefix_len >= 127) /* RFC 6164 */
2200                 return;
2201         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2202         if (ipv6_addr_any(&addr))
2203                 return;
2204         __ipv6_dev_ac_inc(ifp->idev, &addr);
2205 }
2206
2207 /* caller must hold RTNL */
2208 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2209 {
2210         struct in6_addr addr;
2211
2212         if (ifp->prefix_len >= 127) /* RFC 6164 */
2213                 return;
2214         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2215         if (ipv6_addr_any(&addr))
2216                 return;
2217         __ipv6_dev_ac_dec(ifp->idev, &addr);
2218 }
2219
2220 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2221 {
2222         switch (dev->addr_len) {
2223         case ETH_ALEN:
2224                 memcpy(eui, dev->dev_addr, 3);
2225                 eui[3] = 0xFF;
2226                 eui[4] = 0xFE;
2227                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2228                 break;
2229         case EUI64_ADDR_LEN:
2230                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2231                 eui[0] ^= 2;
2232                 break;
2233         default:
2234                 return -1;
2235         }
2236
2237         return 0;
2238 }
2239
2240 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2241 {
2242         const union fwnet_hwaddr *ha;
2243
2244         if (dev->addr_len != FWNET_ALEN)
2245                 return -1;
2246
2247         ha = (const union fwnet_hwaddr *)dev->dev_addr;
2248
2249         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2250         eui[0] ^= 2;
2251         return 0;
2252 }
2253
2254 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2255 {
2256         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2257         if (dev->addr_len != ARCNET_ALEN)
2258                 return -1;
2259         memset(eui, 0, 7);
2260         eui[7] = *(u8 *)dev->dev_addr;
2261         return 0;
2262 }
2263
2264 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2265 {
2266         if (dev->addr_len != INFINIBAND_ALEN)
2267                 return -1;
2268         memcpy(eui, dev->dev_addr + 12, 8);
2269         eui[0] |= 2;
2270         return 0;
2271 }
2272
2273 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2274 {
2275         if (addr == 0)
2276                 return -1;
2277         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2278                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2279                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2280                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2281                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2282                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2283         eui[1] = 0;
2284         eui[2] = 0x5E;
2285         eui[3] = 0xFE;
2286         memcpy(eui + 4, &addr, 4);
2287         return 0;
2288 }
2289
2290 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2291 {
2292         if (dev->priv_flags & IFF_ISATAP)
2293                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2294         return -1;
2295 }
2296
2297 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2298 {
2299         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2300 }
2301
2302 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2303 {
2304         memcpy(eui, dev->perm_addr, 3);
2305         memcpy(eui + 5, dev->perm_addr + 3, 3);
2306         eui[3] = 0xFF;
2307         eui[4] = 0xFE;
2308         eui[0] ^= 2;
2309         return 0;
2310 }
2311
2312 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2313 {
2314         switch (dev->type) {
2315         case ARPHRD_ETHER:
2316         case ARPHRD_FDDI:
2317                 return addrconf_ifid_eui48(eui, dev);
2318         case ARPHRD_ARCNET:
2319                 return addrconf_ifid_arcnet(eui, dev);
2320         case ARPHRD_INFINIBAND:
2321                 return addrconf_ifid_infiniband(eui, dev);
2322         case ARPHRD_SIT:
2323                 return addrconf_ifid_sit(eui, dev);
2324         case ARPHRD_IPGRE:
2325         case ARPHRD_TUNNEL:
2326                 return addrconf_ifid_gre(eui, dev);
2327         case ARPHRD_6LOWPAN:
2328                 return addrconf_ifid_6lowpan(eui, dev);
2329         case ARPHRD_IEEE1394:
2330                 return addrconf_ifid_ieee1394(eui, dev);
2331         case ARPHRD_TUNNEL6:
2332         case ARPHRD_IP6GRE:
2333         case ARPHRD_RAWIP:
2334                 return addrconf_ifid_ip6tnl(eui, dev);
2335         }
2336         return -1;
2337 }
2338
2339 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2340 {
2341         int err = -1;
2342         struct inet6_ifaddr *ifp;
2343
2344         read_lock_bh(&idev->lock);
2345         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2346                 if (ifp->scope > IFA_LINK)
2347                         break;
2348                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2349                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2350                         err = 0;
2351                         break;
2352                 }
2353         }
2354         read_unlock_bh(&idev->lock);
2355         return err;
2356 }
2357
2358 /* Generation of a randomized Interface Identifier
2359  * draft-ietf-6man-rfc4941bis, Section 3.3.1
2360  */
2361
2362 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2363 {
2364 regen:
2365         get_random_bytes(&addr->s6_addr[8], 8);
2366
2367         /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2368          * check if generated address is not inappropriate:
2369          *
2370          * - Reserved IPv6 Interface Identifiers
2371          * - XXX: already assigned to an address on the device
2372          */
2373
2374         /* Subnet-router anycast: 0000:0000:0000:0000 */
2375         if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2376                 goto regen;
2377
2378         /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2379          * Proxy Mobile IPv6:   0200:5EFF:FE00:5213
2380          * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2381          */
2382         if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2383             (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2384                 goto regen;
2385
2386         /* Reserved subnet anycast addresses */
2387         if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2388             ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2389                 goto regen;
2390 }
2391
2392 /*
2393  *      Add prefix route.
2394  */
2395
2396 static void
2397 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2398                       struct net_device *dev, unsigned long expires,
2399                       u32 flags, gfp_t gfp_flags)
2400 {
2401         struct fib6_config cfg = {
2402                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2403                 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2404                 .fc_ifindex = dev->ifindex,
2405                 .fc_expires = expires,
2406                 .fc_dst_len = plen,
2407                 .fc_flags = RTF_UP | flags,
2408                 .fc_nlinfo.nl_net = dev_net(dev),
2409                 .fc_protocol = RTPROT_KERNEL,
2410                 .fc_type = RTN_UNICAST,
2411         };
2412
2413         cfg.fc_dst = *pfx;
2414
2415         /* Prevent useless cloning on PtP SIT.
2416            This thing is done here expecting that the whole
2417            class of non-broadcast devices need not cloning.
2418          */
2419 #if IS_ENABLED(CONFIG_IPV6_SIT)
2420         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2421                 cfg.fc_flags |= RTF_NONEXTHOP;
2422 #endif
2423
2424         ip6_route_add(&cfg, gfp_flags, NULL);
2425 }
2426
2427
2428 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2429                                                   int plen,
2430                                                   const struct net_device *dev,
2431                                                   u32 flags, u32 noflags,
2432                                                   bool no_gw)
2433 {
2434         struct fib6_node *fn;
2435         struct fib6_info *rt = NULL;
2436         struct fib6_table *table;
2437         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2438
2439         table = fib6_get_table(dev_net(dev), tb_id);
2440         if (!table)
2441                 return NULL;
2442
2443         rcu_read_lock();
2444         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2445         if (!fn)
2446                 goto out;
2447
2448         for_each_fib6_node_rt_rcu(fn) {
2449                 /* prefix routes only use builtin fib6_nh */
2450                 if (rt->nh)
2451                         continue;
2452
2453                 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2454                         continue;
2455                 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2456                         continue;
2457                 if ((rt->fib6_flags & flags) != flags)
2458                         continue;
2459                 if ((rt->fib6_flags & noflags) != 0)
2460                         continue;
2461                 if (!fib6_info_hold_safe(rt))
2462                         continue;
2463                 break;
2464         }
2465 out:
2466         rcu_read_unlock();
2467         return rt;
2468 }
2469
2470
2471 /* Create "default" multicast route to the interface */
2472
2473 static void addrconf_add_mroute(struct net_device *dev)
2474 {
2475         struct fib6_config cfg = {
2476                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2477                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2478                 .fc_ifindex = dev->ifindex,
2479                 .fc_dst_len = 8,
2480                 .fc_flags = RTF_UP,
2481                 .fc_type = RTN_MULTICAST,
2482                 .fc_nlinfo.nl_net = dev_net(dev),
2483                 .fc_protocol = RTPROT_KERNEL,
2484         };
2485
2486         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2487
2488         ip6_route_add(&cfg, GFP_KERNEL, NULL);
2489 }
2490
2491 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2492 {
2493         struct inet6_dev *idev;
2494
2495         ASSERT_RTNL();
2496
2497         idev = ipv6_find_idev(dev);
2498         if (IS_ERR(idev))
2499                 return idev;
2500
2501         if (idev->cnf.disable_ipv6)
2502                 return ERR_PTR(-EACCES);
2503
2504         /* Add default multicast route */
2505         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2506                 addrconf_add_mroute(dev);
2507
2508         return idev;
2509 }
2510
2511 static void manage_tempaddrs(struct inet6_dev *idev,
2512                              struct inet6_ifaddr *ifp,
2513                              __u32 valid_lft, __u32 prefered_lft,
2514                              bool create, unsigned long now)
2515 {
2516         u32 flags;
2517         struct inet6_ifaddr *ift;
2518
2519         read_lock_bh(&idev->lock);
2520         /* update all temporary addresses in the list */
2521         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2522                 int age, max_valid, max_prefered;
2523
2524                 if (ifp != ift->ifpub)
2525                         continue;
2526
2527                 /* RFC 4941 section 3.3:
2528                  * If a received option will extend the lifetime of a public
2529                  * address, the lifetimes of temporary addresses should
2530                  * be extended, subject to the overall constraint that no
2531                  * temporary addresses should ever remain "valid" or "preferred"
2532                  * for a time longer than (TEMP_VALID_LIFETIME) or
2533                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2534                  */
2535                 age = (now - ift->cstamp) / HZ;
2536                 max_valid = idev->cnf.temp_valid_lft - age;
2537                 if (max_valid < 0)
2538                         max_valid = 0;
2539
2540                 max_prefered = idev->cnf.temp_prefered_lft -
2541                                idev->desync_factor - age;
2542                 if (max_prefered < 0)
2543                         max_prefered = 0;
2544
2545                 if (valid_lft > max_valid)
2546                         valid_lft = max_valid;
2547
2548                 if (prefered_lft > max_prefered)
2549                         prefered_lft = max_prefered;
2550
2551                 spin_lock(&ift->lock);
2552                 flags = ift->flags;
2553                 ift->valid_lft = valid_lft;
2554                 ift->prefered_lft = prefered_lft;
2555                 ift->tstamp = now;
2556                 if (prefered_lft > 0)
2557                         ift->flags &= ~IFA_F_DEPRECATED;
2558
2559                 spin_unlock(&ift->lock);
2560                 if (!(flags&IFA_F_TENTATIVE))
2561                         ipv6_ifa_notify(0, ift);
2562         }
2563
2564         if ((create || list_empty(&idev->tempaddr_list)) &&
2565             idev->cnf.use_tempaddr > 0) {
2566                 /* When a new public address is created as described
2567                  * in [ADDRCONF], also create a new temporary address.
2568                  * Also create a temporary address if it's enabled but
2569                  * no temporary address currently exists.
2570                  */
2571                 read_unlock_bh(&idev->lock);
2572                 ipv6_create_tempaddr(ifp, false);
2573         } else {
2574                 read_unlock_bh(&idev->lock);
2575         }
2576 }
2577
2578 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2579 {
2580         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2581                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2582 }
2583
2584 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2585                                  const struct prefix_info *pinfo,
2586                                  struct inet6_dev *in6_dev,
2587                                  const struct in6_addr *addr, int addr_type,
2588                                  u32 addr_flags, bool sllao, bool tokenized,
2589                                  __u32 valid_lft, u32 prefered_lft)
2590 {
2591         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2592         int create = 0;
2593
2594         if (!ifp && valid_lft) {
2595                 int max_addresses = in6_dev->cnf.max_addresses;
2596                 struct ifa6_config cfg = {
2597                         .pfx = addr,
2598                         .plen = pinfo->prefix_len,
2599                         .ifa_flags = addr_flags,
2600                         .valid_lft = valid_lft,
2601                         .preferred_lft = prefered_lft,
2602                         .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2603                 };
2604
2605 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2606                 if ((net->ipv6.devconf_all->optimistic_dad ||
2607                      in6_dev->cnf.optimistic_dad) &&
2608                     !net->ipv6.devconf_all->forwarding && sllao)
2609                         cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2610 #endif
2611
2612                 /* Do not allow to create too much of autoconfigured
2613                  * addresses; this would be too easy way to crash kernel.
2614                  */
2615                 if (!max_addresses ||
2616                     ipv6_count_addresses(in6_dev) < max_addresses)
2617                         ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2618
2619                 if (IS_ERR_OR_NULL(ifp))
2620                         return -1;
2621
2622                 create = 1;
2623                 spin_lock_bh(&ifp->lock);
2624                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2625                 ifp->cstamp = jiffies;
2626                 ifp->tokenized = tokenized;
2627                 spin_unlock_bh(&ifp->lock);
2628                 addrconf_dad_start(ifp);
2629         }
2630
2631         if (ifp) {
2632                 u32 flags;
2633                 unsigned long now;
2634                 u32 stored_lft;
2635
2636                 /* Update lifetime (RFC4862 5.5.3 e)
2637                  * We deviate from RFC4862 by honoring all Valid Lifetimes to
2638                  * improve the reaction of SLAAC to renumbering events
2639                  * (draft-gont-6man-slaac-renum-06, Section 4.2)
2640                  */
2641                 spin_lock_bh(&ifp->lock);
2642                 now = jiffies;
2643                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2644                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2645                 else
2646                         stored_lft = 0;
2647
2648                 if (!create && stored_lft) {
2649                         ifp->valid_lft = valid_lft;
2650                         ifp->prefered_lft = prefered_lft;
2651                         ifp->tstamp = now;
2652                         flags = ifp->flags;
2653                         ifp->flags &= ~IFA_F_DEPRECATED;
2654                         spin_unlock_bh(&ifp->lock);
2655
2656                         if (!(flags&IFA_F_TENTATIVE))
2657                                 ipv6_ifa_notify(0, ifp);
2658                 } else
2659                         spin_unlock_bh(&ifp->lock);
2660
2661                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2662                                  create, now);
2663
2664                 in6_ifa_put(ifp);
2665                 addrconf_verify();
2666         }
2667
2668         return 0;
2669 }
2670 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2671
2672 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2673 {
2674         struct prefix_info *pinfo;
2675         __u32 valid_lft;
2676         __u32 prefered_lft;
2677         int addr_type, err;
2678         u32 addr_flags = 0;
2679         struct inet6_dev *in6_dev;
2680         struct net *net = dev_net(dev);
2681
2682         pinfo = (struct prefix_info *) opt;
2683
2684         if (len < sizeof(struct prefix_info)) {
2685                 netdev_dbg(dev, "addrconf: prefix option too short\n");
2686                 return;
2687         }
2688
2689         /*
2690          *      Validation checks ([ADDRCONF], page 19)
2691          */
2692
2693         addr_type = ipv6_addr_type(&pinfo->prefix);
2694
2695         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2696                 return;
2697
2698         valid_lft = ntohl(pinfo->valid);
2699         prefered_lft = ntohl(pinfo->prefered);
2700
2701         if (prefered_lft > valid_lft) {
2702                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2703                 return;
2704         }
2705
2706         in6_dev = in6_dev_get(dev);
2707
2708         if (!in6_dev) {
2709                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2710                                     dev->name);
2711                 return;
2712         }
2713
2714         /*
2715          *      Two things going on here:
2716          *      1) Add routes for on-link prefixes
2717          *      2) Configure prefixes with the auto flag set
2718          */
2719
2720         if (pinfo->onlink) {
2721                 struct fib6_info *rt;
2722                 unsigned long rt_expires;
2723
2724                 /* Avoid arithmetic overflow. Really, we could
2725                  * save rt_expires in seconds, likely valid_lft,
2726                  * but it would require division in fib gc, that it
2727                  * not good.
2728                  */
2729                 if (HZ > USER_HZ)
2730                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2731                 else
2732                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2733
2734                 if (addrconf_finite_timeout(rt_expires))
2735                         rt_expires *= HZ;
2736
2737                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2738                                                pinfo->prefix_len,
2739                                                dev,
2740                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2741                                                RTF_DEFAULT, true);
2742
2743                 if (rt) {
2744                         /* Autoconf prefix route */
2745                         if (valid_lft == 0) {
2746                                 ip6_del_rt(net, rt, false);
2747                                 rt = NULL;
2748                         } else if (addrconf_finite_timeout(rt_expires)) {
2749                                 /* not infinity */
2750                                 fib6_set_expires(rt, jiffies + rt_expires);
2751                         } else {
2752                                 fib6_clean_expires(rt);
2753                         }
2754                 } else if (valid_lft) {
2755                         clock_t expires = 0;
2756                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2757                         if (addrconf_finite_timeout(rt_expires)) {
2758                                 /* not infinity */
2759                                 flags |= RTF_EXPIRES;
2760                                 expires = jiffies_to_clock_t(rt_expires);
2761                         }
2762                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2763                                               0, dev, expires, flags,
2764                                               GFP_ATOMIC);
2765                 }
2766                 fib6_info_release(rt);
2767         }
2768
2769         /* Try to figure out our local address for this prefix */
2770
2771         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2772                 struct in6_addr addr;
2773                 bool tokenized = false, dev_addr_generated = false;
2774
2775                 if (pinfo->prefix_len == 64) {
2776                         memcpy(&addr, &pinfo->prefix, 8);
2777
2778                         if (!ipv6_addr_any(&in6_dev->token)) {
2779                                 read_lock_bh(&in6_dev->lock);
2780                                 memcpy(addr.s6_addr + 8,
2781                                        in6_dev->token.s6_addr + 8, 8);
2782                                 read_unlock_bh(&in6_dev->lock);
2783                                 tokenized = true;
2784                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2785                                    !ipv6_generate_stable_address(&addr, 0,
2786                                                                  in6_dev)) {
2787                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2788                                 goto ok;
2789                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2790                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2791                                 goto put;
2792                         } else {
2793                                 dev_addr_generated = true;
2794                         }
2795                         goto ok;
2796                 }
2797                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2798                                     pinfo->prefix_len);
2799                 goto put;
2800
2801 ok:
2802                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2803                                                    &addr, addr_type,
2804                                                    addr_flags, sllao,
2805                                                    tokenized, valid_lft,
2806                                                    prefered_lft);
2807                 if (err)
2808                         goto put;
2809
2810                 /* Ignore error case here because previous prefix add addr was
2811                  * successful which will be notified.
2812                  */
2813                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2814                                               addr_type, addr_flags, sllao,
2815                                               tokenized, valid_lft,
2816                                               prefered_lft,
2817                                               dev_addr_generated);
2818         }
2819         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2820 put:
2821         in6_dev_put(in6_dev);
2822 }
2823
2824 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2825                 struct in6_ifreq *ireq)
2826 {
2827         struct ip_tunnel_parm p = { };
2828         int err;
2829
2830         if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2831                 return -EADDRNOTAVAIL;
2832
2833         p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2834         p.iph.version = 4;
2835         p.iph.ihl = 5;
2836         p.iph.protocol = IPPROTO_IPV6;
2837         p.iph.ttl = 64;
2838
2839         if (!dev->netdev_ops->ndo_tunnel_ctl)
2840                 return -EOPNOTSUPP;
2841         err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2842         if (err)
2843                 return err;
2844
2845         dev = __dev_get_by_name(net, p.name);
2846         if (!dev)
2847                 return -ENOBUFS;
2848         return dev_open(dev, NULL);
2849 }
2850
2851 /*
2852  *      Set destination address.
2853  *      Special case for SIT interfaces where we create a new "virtual"
2854  *      device.
2855  */
2856 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2857 {
2858         struct net_device *dev;
2859         struct in6_ifreq ireq;
2860         int err = -ENODEV;
2861
2862         if (!IS_ENABLED(CONFIG_IPV6_SIT))
2863                 return -ENODEV;
2864         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2865                 return -EFAULT;
2866
2867         rtnl_lock();
2868         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2869         if (dev && dev->type == ARPHRD_SIT)
2870                 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2871         rtnl_unlock();
2872         return err;
2873 }
2874
2875 static int ipv6_mc_config(struct sock *sk, bool join,
2876                           const struct in6_addr *addr, int ifindex)
2877 {
2878         int ret;
2879
2880         ASSERT_RTNL();
2881
2882         lock_sock(sk);
2883         if (join)
2884                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2885         else
2886                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2887         release_sock(sk);
2888
2889         return ret;
2890 }
2891
2892 /*
2893  *      Manual configuration of address on an interface
2894  */
2895 static int inet6_addr_add(struct net *net, int ifindex,
2896                           struct ifa6_config *cfg,
2897                           struct netlink_ext_ack *extack)
2898 {
2899         struct inet6_ifaddr *ifp;
2900         struct inet6_dev *idev;
2901         struct net_device *dev;
2902         unsigned long timeout;
2903         clock_t expires;
2904         u32 flags;
2905
2906         ASSERT_RTNL();
2907
2908         if (cfg->plen > 128)
2909                 return -EINVAL;
2910
2911         /* check the lifetime */
2912         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2913                 return -EINVAL;
2914
2915         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2916                 return -EINVAL;
2917
2918         dev = __dev_get_by_index(net, ifindex);
2919         if (!dev)
2920                 return -ENODEV;
2921
2922         idev = addrconf_add_dev(dev);
2923         if (IS_ERR(idev))
2924                 return PTR_ERR(idev);
2925
2926         if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2927                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2928                                          true, cfg->pfx, ifindex);
2929
2930                 if (ret < 0)
2931                         return ret;
2932         }
2933
2934         cfg->scope = ipv6_addr_scope(cfg->pfx);
2935
2936         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2937         if (addrconf_finite_timeout(timeout)) {
2938                 expires = jiffies_to_clock_t(timeout * HZ);
2939                 cfg->valid_lft = timeout;
2940                 flags = RTF_EXPIRES;
2941         } else {
2942                 expires = 0;
2943                 flags = 0;
2944                 cfg->ifa_flags |= IFA_F_PERMANENT;
2945         }
2946
2947         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2948         if (addrconf_finite_timeout(timeout)) {
2949                 if (timeout == 0)
2950                         cfg->ifa_flags |= IFA_F_DEPRECATED;
2951                 cfg->preferred_lft = timeout;
2952         }
2953
2954         ifp = ipv6_add_addr(idev, cfg, true, extack);
2955         if (!IS_ERR(ifp)) {
2956                 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2957                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2958                                               ifp->rt_priority, dev, expires,
2959                                               flags, GFP_KERNEL);
2960                 }
2961
2962                 /* Send a netlink notification if DAD is enabled and
2963                  * optimistic flag is not set
2964                  */
2965                 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2966                         ipv6_ifa_notify(0, ifp);
2967                 /*
2968                  * Note that section 3.1 of RFC 4429 indicates
2969                  * that the Optimistic flag should not be set for
2970                  * manually configured addresses
2971                  */
2972                 addrconf_dad_start(ifp);
2973                 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2974                         manage_tempaddrs(idev, ifp, cfg->valid_lft,
2975                                          cfg->preferred_lft, true, jiffies);
2976                 in6_ifa_put(ifp);
2977                 addrconf_verify_rtnl();
2978                 return 0;
2979         } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2980                 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2981                                cfg->pfx, ifindex);
2982         }
2983
2984         return PTR_ERR(ifp);
2985 }
2986
2987 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2988                           const struct in6_addr *pfx, unsigned int plen)
2989 {
2990         struct inet6_ifaddr *ifp;
2991         struct inet6_dev *idev;
2992         struct net_device *dev;
2993
2994         if (plen > 128)
2995                 return -EINVAL;
2996
2997         dev = __dev_get_by_index(net, ifindex);
2998         if (!dev)
2999                 return -ENODEV;
3000
3001         idev = __in6_dev_get(dev);
3002         if (!idev)
3003                 return -ENXIO;
3004
3005         read_lock_bh(&idev->lock);
3006         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3007                 if (ifp->prefix_len == plen &&
3008                     ipv6_addr_equal(pfx, &ifp->addr)) {
3009                         in6_ifa_hold(ifp);
3010                         read_unlock_bh(&idev->lock);
3011
3012                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
3013                             (ifa_flags & IFA_F_MANAGETEMPADDR))
3014                                 manage_tempaddrs(idev, ifp, 0, 0, false,
3015                                                  jiffies);
3016                         ipv6_del_addr(ifp);
3017                         addrconf_verify_rtnl();
3018                         if (ipv6_addr_is_multicast(pfx)) {
3019                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3020                                                false, pfx, dev->ifindex);
3021                         }
3022                         return 0;
3023                 }
3024         }
3025         read_unlock_bh(&idev->lock);
3026         return -EADDRNOTAVAIL;
3027 }
3028
3029
3030 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3031 {
3032         struct ifa6_config cfg = {
3033                 .ifa_flags = IFA_F_PERMANENT,
3034                 .preferred_lft = INFINITY_LIFE_TIME,
3035                 .valid_lft = INFINITY_LIFE_TIME,
3036         };
3037         struct in6_ifreq ireq;
3038         int err;
3039
3040         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3041                 return -EPERM;
3042
3043         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3044                 return -EFAULT;
3045
3046         cfg.pfx = &ireq.ifr6_addr;
3047         cfg.plen = ireq.ifr6_prefixlen;
3048
3049         rtnl_lock();
3050         err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3051         rtnl_unlock();
3052         return err;
3053 }
3054
3055 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3056 {
3057         struct in6_ifreq ireq;
3058         int err;
3059
3060         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3061                 return -EPERM;
3062
3063         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3064                 return -EFAULT;
3065
3066         rtnl_lock();
3067         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3068                              ireq.ifr6_prefixlen);
3069         rtnl_unlock();
3070         return err;
3071 }
3072
3073 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3074                      int plen, int scope)
3075 {
3076         struct inet6_ifaddr *ifp;
3077         struct ifa6_config cfg = {
3078                 .pfx = addr,
3079                 .plen = plen,
3080                 .ifa_flags = IFA_F_PERMANENT,
3081                 .valid_lft = INFINITY_LIFE_TIME,
3082                 .preferred_lft = INFINITY_LIFE_TIME,
3083                 .scope = scope
3084         };
3085
3086         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3087         if (!IS_ERR(ifp)) {
3088                 spin_lock_bh(&ifp->lock);
3089                 ifp->flags &= ~IFA_F_TENTATIVE;
3090                 spin_unlock_bh(&ifp->lock);
3091                 rt_genid_bump_ipv6(dev_net(idev->dev));
3092                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3093                 in6_ifa_put(ifp);
3094         }
3095 }
3096
3097 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3098 static void add_v4_addrs(struct inet6_dev *idev)
3099 {
3100         struct in6_addr addr;
3101         struct net_device *dev;
3102         struct net *net = dev_net(idev->dev);
3103         int scope, plen, offset = 0;
3104         u32 pflags = 0;
3105
3106         ASSERT_RTNL();
3107
3108         memset(&addr, 0, sizeof(struct in6_addr));
3109         /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3110         if (idev->dev->addr_len == sizeof(struct in6_addr))
3111                 offset = sizeof(struct in6_addr) - 4;
3112         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3113
3114         if (idev->dev->flags&IFF_POINTOPOINT) {
3115                 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3116                         return;
3117
3118                 addr.s6_addr32[0] = htonl(0xfe800000);
3119                 scope = IFA_LINK;
3120                 plen = 64;
3121         } else {
3122                 scope = IPV6_ADDR_COMPATv4;
3123                 plen = 96;
3124                 pflags |= RTF_NONEXTHOP;
3125         }
3126
3127         if (addr.s6_addr32[3]) {
3128                 add_addr(idev, &addr, plen, scope);
3129                 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3130                                       GFP_KERNEL);
3131                 return;
3132         }
3133
3134         for_each_netdev(net, dev) {
3135                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3136                 if (in_dev && (dev->flags & IFF_UP)) {
3137                         struct in_ifaddr *ifa;
3138                         int flag = scope;
3139
3140                         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3141                                 addr.s6_addr32[3] = ifa->ifa_local;
3142
3143                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3144                                         continue;
3145                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3146                                         if (idev->dev->flags&IFF_POINTOPOINT)
3147                                                 continue;
3148                                         flag |= IFA_HOST;
3149                                 }
3150
3151                                 add_addr(idev, &addr, plen, flag);
3152                                 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3153                                                       0, pflags, GFP_KERNEL);
3154                         }
3155                 }
3156         }
3157 }
3158 #endif
3159
3160 static void init_loopback(struct net_device *dev)
3161 {
3162         struct inet6_dev  *idev;
3163
3164         /* ::1 */
3165
3166         ASSERT_RTNL();
3167
3168         idev = ipv6_find_idev(dev);
3169         if (IS_ERR(idev)) {
3170                 pr_debug("%s: add_dev failed\n", __func__);
3171                 return;
3172         }
3173
3174         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3175 }
3176
3177 void addrconf_add_linklocal(struct inet6_dev *idev,
3178                             const struct in6_addr *addr, u32 flags)
3179 {
3180         struct ifa6_config cfg = {
3181                 .pfx = addr,
3182                 .plen = 64,
3183                 .ifa_flags = flags | IFA_F_PERMANENT,
3184                 .valid_lft = INFINITY_LIFE_TIME,
3185                 .preferred_lft = INFINITY_LIFE_TIME,
3186                 .scope = IFA_LINK
3187         };
3188         struct inet6_ifaddr *ifp;
3189
3190 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3191         if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3192              idev->cnf.optimistic_dad) &&
3193             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3194                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3195 #endif
3196
3197         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3198         if (!IS_ERR(ifp)) {
3199                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3200                                       0, 0, GFP_ATOMIC);
3201                 addrconf_dad_start(ifp);
3202                 in6_ifa_put(ifp);
3203         }
3204 }
3205 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3206
3207 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3208 {
3209         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3210                 return true;
3211
3212         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3213             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3214                 return true;
3215
3216         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3217             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3218                 return true;
3219
3220         return false;
3221 }
3222
3223 static int ipv6_generate_stable_address(struct in6_addr *address,
3224                                         u8 dad_count,
3225                                         const struct inet6_dev *idev)
3226 {
3227         static DEFINE_SPINLOCK(lock);
3228         static __u32 digest[SHA1_DIGEST_WORDS];
3229         static __u32 workspace[SHA1_WORKSPACE_WORDS];
3230
3231         static union {
3232                 char __data[SHA1_BLOCK_SIZE];
3233                 struct {
3234                         struct in6_addr secret;
3235                         __be32 prefix[2];
3236                         unsigned char hwaddr[MAX_ADDR_LEN];
3237                         u8 dad_count;
3238                 } __packed;
3239         } data;
3240
3241         struct in6_addr secret;
3242         struct in6_addr temp;
3243         struct net *net = dev_net(idev->dev);
3244
3245         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3246
3247         if (idev->cnf.stable_secret.initialized)
3248                 secret = idev->cnf.stable_secret.secret;
3249         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3250                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3251         else
3252                 return -1;
3253
3254 retry:
3255         spin_lock_bh(&lock);
3256
3257         sha1_init(digest);
3258         memset(&data, 0, sizeof(data));
3259         memset(workspace, 0, sizeof(workspace));
3260         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3261         data.prefix[0] = address->s6_addr32[0];
3262         data.prefix[1] = address->s6_addr32[1];
3263         data.secret = secret;
3264         data.dad_count = dad_count;
3265
3266         sha1_transform(digest, data.__data, workspace);
3267
3268         temp = *address;
3269         temp.s6_addr32[2] = (__force __be32)digest[0];
3270         temp.s6_addr32[3] = (__force __be32)digest[1];
3271
3272         spin_unlock_bh(&lock);
3273
3274         if (ipv6_reserved_interfaceid(temp)) {
3275                 dad_count++;
3276                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3277                         return -1;
3278                 goto retry;
3279         }
3280
3281         *address = temp;
3282         return 0;
3283 }
3284
3285 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3286 {
3287         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3288
3289         if (s->initialized)
3290                 return;
3291         s = &idev->cnf.stable_secret;
3292         get_random_bytes(&s->secret, sizeof(s->secret));
3293         s->initialized = true;
3294 }
3295
3296 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3297 {
3298         struct in6_addr addr;
3299
3300         /* no link local addresses on L3 master devices */
3301         if (netif_is_l3_master(idev->dev))
3302                 return;
3303
3304         /* no link local addresses on devices flagged as slaves */
3305         if (idev->dev->flags & IFF_SLAVE)
3306                 return;
3307
3308         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3309
3310         switch (idev->cnf.addr_gen_mode) {
3311         case IN6_ADDR_GEN_MODE_RANDOM:
3312                 ipv6_gen_mode_random_init(idev);
3313                 fallthrough;
3314         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3315                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3316                         addrconf_add_linklocal(idev, &addr,
3317                                                IFA_F_STABLE_PRIVACY);
3318                 else if (prefix_route)
3319                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3320                                               0, 0, GFP_KERNEL);
3321                 break;
3322         case IN6_ADDR_GEN_MODE_EUI64:
3323                 /* addrconf_add_linklocal also adds a prefix_route and we
3324                  * only need to care about prefix routes if ipv6_generate_eui64
3325                  * couldn't generate one.
3326                  */
3327                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3328                         addrconf_add_linklocal(idev, &addr, 0);
3329                 else if (prefix_route)
3330                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3331                                               0, 0, GFP_KERNEL);
3332                 break;
3333         case IN6_ADDR_GEN_MODE_NONE:
3334         default:
3335                 /* will not add any link local address */
3336                 break;
3337         }
3338 }
3339
3340 static void addrconf_dev_config(struct net_device *dev)
3341 {
3342         struct inet6_dev *idev;
3343
3344         ASSERT_RTNL();
3345
3346         if ((dev->type != ARPHRD_ETHER) &&
3347             (dev->type != ARPHRD_FDDI) &&
3348             (dev->type != ARPHRD_ARCNET) &&
3349             (dev->type != ARPHRD_INFINIBAND) &&
3350             (dev->type != ARPHRD_IEEE1394) &&
3351             (dev->type != ARPHRD_TUNNEL6) &&
3352             (dev->type != ARPHRD_6LOWPAN) &&
3353             (dev->type != ARPHRD_TUNNEL) &&
3354             (dev->type != ARPHRD_NONE) &&
3355             (dev->type != ARPHRD_RAWIP)) {
3356                 /* Alas, we support only Ethernet autoconfiguration. */
3357                 idev = __in6_dev_get(dev);
3358                 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3359                     dev->flags & IFF_MULTICAST)
3360                         ipv6_mc_up(idev);
3361                 return;
3362         }
3363
3364         idev = addrconf_add_dev(dev);
3365         if (IS_ERR(idev))
3366                 return;
3367
3368         /* this device type has no EUI support */
3369         if (dev->type == ARPHRD_NONE &&
3370             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3371                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3372
3373         addrconf_addr_gen(idev, false);
3374 }
3375
3376 #if IS_ENABLED(CONFIG_IPV6_SIT)
3377 static void addrconf_sit_config(struct net_device *dev)
3378 {
3379         struct inet6_dev *idev;
3380
3381         ASSERT_RTNL();
3382
3383         /*
3384          * Configure the tunnel with one of our IPv4
3385          * addresses... we should configure all of
3386          * our v4 addrs in the tunnel
3387          */
3388
3389         idev = ipv6_find_idev(dev);
3390         if (IS_ERR(idev)) {
3391                 pr_debug("%s: add_dev failed\n", __func__);
3392                 return;
3393         }
3394
3395         if (dev->priv_flags & IFF_ISATAP) {
3396                 addrconf_addr_gen(idev, false);
3397                 return;
3398         }
3399
3400         add_v4_addrs(idev);
3401
3402         if (dev->flags&IFF_POINTOPOINT)
3403                 addrconf_add_mroute(dev);
3404 }
3405 #endif
3406
3407 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3408 static void addrconf_gre_config(struct net_device *dev)
3409 {
3410         struct inet6_dev *idev;
3411
3412         ASSERT_RTNL();
3413
3414         idev = ipv6_find_idev(dev);
3415         if (IS_ERR(idev)) {
3416                 pr_debug("%s: add_dev failed\n", __func__);
3417                 return;
3418         }
3419
3420         if (dev->type == ARPHRD_ETHER) {
3421                 addrconf_addr_gen(idev, true);
3422                 return;
3423         }
3424
3425         add_v4_addrs(idev);
3426
3427         if (dev->flags & IFF_POINTOPOINT)
3428                 addrconf_add_mroute(dev);
3429 }
3430 #endif
3431
3432 static int fixup_permanent_addr(struct net *net,
3433                                 struct inet6_dev *idev,
3434                                 struct inet6_ifaddr *ifp)
3435 {
3436         /* !fib6_node means the host route was removed from the
3437          * FIB, for example, if 'lo' device is taken down. In that
3438          * case regenerate the host route.
3439          */
3440         if (!ifp->rt || !ifp->rt->fib6_node) {
3441                 struct fib6_info *f6i, *prev;
3442
3443                 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3444                                          GFP_ATOMIC);
3445                 if (IS_ERR(f6i))
3446                         return PTR_ERR(f6i);
3447
3448                 /* ifp->rt can be accessed outside of rtnl */
3449                 spin_lock(&ifp->lock);
3450                 prev = ifp->rt;
3451                 ifp->rt = f6i;
3452                 spin_unlock(&ifp->lock);
3453
3454                 fib6_info_release(prev);
3455         }
3456
3457         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3458                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3459                                       ifp->rt_priority, idev->dev, 0, 0,
3460                                       GFP_ATOMIC);
3461         }
3462
3463         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3464                 addrconf_dad_start(ifp);
3465
3466         return 0;
3467 }
3468
3469 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3470 {
3471         struct inet6_ifaddr *ifp, *tmp;
3472         struct inet6_dev *idev;
3473
3474         idev = __in6_dev_get(dev);
3475         if (!idev)
3476                 return;
3477
3478         write_lock_bh(&idev->lock);
3479
3480         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3481                 if ((ifp->flags & IFA_F_PERMANENT) &&
3482                     fixup_permanent_addr(net, idev, ifp) < 0) {
3483                         write_unlock_bh(&idev->lock);
3484                         in6_ifa_hold(ifp);
3485                         ipv6_del_addr(ifp);
3486                         write_lock_bh(&idev->lock);
3487
3488                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3489                                              idev->dev->name, &ifp->addr);
3490                 }
3491         }
3492
3493         write_unlock_bh(&idev->lock);
3494 }
3495
3496 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3497                            void *ptr)
3498 {
3499         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3500         struct netdev_notifier_change_info *change_info;
3501         struct netdev_notifier_changeupper_info *info;
3502         struct inet6_dev *idev = __in6_dev_get(dev);
3503         struct net *net = dev_net(dev);
3504         int run_pending = 0;
3505         int err;
3506
3507         switch (event) {
3508         case NETDEV_REGISTER:
3509                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3510                         idev = ipv6_add_dev(dev);
3511                         if (IS_ERR(idev))
3512                                 return notifier_from_errno(PTR_ERR(idev));
3513                 }
3514                 break;
3515
3516         case NETDEV_CHANGEMTU:
3517                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3518                 if (dev->mtu < IPV6_MIN_MTU) {
3519                         addrconf_ifdown(dev, dev != net->loopback_dev);
3520                         break;
3521                 }
3522
3523                 if (idev) {
3524                         rt6_mtu_change(dev, dev->mtu);
3525                         idev->cnf.mtu6 = dev->mtu;
3526                         break;
3527                 }
3528
3529                 /* allocate new idev */
3530                 idev = ipv6_add_dev(dev);
3531                 if (IS_ERR(idev))
3532                         break;
3533
3534                 /* device is still not ready */
3535                 if (!(idev->if_flags & IF_READY))
3536                         break;
3537
3538                 run_pending = 1;
3539                 fallthrough;
3540         case NETDEV_UP:
3541         case NETDEV_CHANGE:
3542                 if (dev->flags & IFF_SLAVE)
3543                         break;
3544
3545                 if (idev && idev->cnf.disable_ipv6)
3546                         break;
3547
3548                 if (event == NETDEV_UP) {
3549                         /* restore routes for permanent addresses */
3550                         addrconf_permanent_addr(net, dev);
3551
3552                         if (!addrconf_link_ready(dev)) {
3553                                 /* device is not ready yet. */
3554                                 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3555                                          dev->name);
3556                                 break;
3557                         }
3558
3559                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3560                                 idev = ipv6_add_dev(dev);
3561
3562                         if (!IS_ERR_OR_NULL(idev)) {
3563                                 idev->if_flags |= IF_READY;
3564                                 run_pending = 1;
3565                         }
3566                 } else if (event == NETDEV_CHANGE) {
3567                         if (!addrconf_link_ready(dev)) {
3568                                 /* device is still not ready. */
3569                                 rt6_sync_down_dev(dev, event);
3570                                 break;
3571                         }
3572
3573                         if (!IS_ERR_OR_NULL(idev)) {
3574                                 if (idev->if_flags & IF_READY) {
3575                                         /* device is already configured -
3576                                          * but resend MLD reports, we might
3577                                          * have roamed and need to update
3578                                          * multicast snooping switches
3579                                          */
3580                                         ipv6_mc_up(idev);
3581                                         change_info = ptr;
3582                                         if (change_info->flags_changed & IFF_NOARP)
3583                                                 addrconf_dad_run(idev, true);
3584                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
3585                                         break;
3586                                 }
3587                                 idev->if_flags |= IF_READY;
3588                         }
3589
3590                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3591                                 dev->name);
3592
3593                         run_pending = 1;
3594                 }
3595
3596                 switch (dev->type) {
3597 #if IS_ENABLED(CONFIG_IPV6_SIT)
3598                 case ARPHRD_SIT:
3599                         addrconf_sit_config(dev);
3600                         break;
3601 #endif
3602 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3603                 case ARPHRD_IP6GRE:
3604                 case ARPHRD_IPGRE:
3605                         addrconf_gre_config(dev);
3606                         break;
3607 #endif
3608                 case ARPHRD_LOOPBACK:
3609                         init_loopback(dev);
3610                         break;
3611
3612                 default:
3613                         addrconf_dev_config(dev);
3614                         break;
3615                 }
3616
3617                 if (!IS_ERR_OR_NULL(idev)) {
3618                         if (run_pending)
3619                                 addrconf_dad_run(idev, false);
3620
3621                         /* Device has an address by now */
3622                         rt6_sync_up(dev, RTNH_F_DEAD);
3623
3624                         /*
3625                          * If the MTU changed during the interface down,
3626                          * when the interface up, the changed MTU must be
3627                          * reflected in the idev as well as routers.
3628                          */
3629                         if (idev->cnf.mtu6 != dev->mtu &&
3630                             dev->mtu >= IPV6_MIN_MTU) {
3631                                 rt6_mtu_change(dev, dev->mtu);
3632                                 idev->cnf.mtu6 = dev->mtu;
3633                         }
3634                         idev->tstamp = jiffies;
3635                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3636
3637                         /*
3638                          * If the changed mtu during down is lower than
3639                          * IPV6_MIN_MTU stop IPv6 on this interface.
3640                          */
3641                         if (dev->mtu < IPV6_MIN_MTU)
3642                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3643                 }
3644                 break;
3645
3646         case NETDEV_DOWN:
3647         case NETDEV_UNREGISTER:
3648                 /*
3649                  *      Remove all addresses from this interface.
3650                  */
3651                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3652                 break;
3653
3654         case NETDEV_CHANGENAME:
3655                 if (idev) {
3656                         snmp6_unregister_dev(idev);
3657                         addrconf_sysctl_unregister(idev);
3658                         err = addrconf_sysctl_register(idev);
3659                         if (err)
3660                                 return notifier_from_errno(err);
3661                         err = snmp6_register_dev(idev);
3662                         if (err) {
3663                                 addrconf_sysctl_unregister(idev);
3664                                 return notifier_from_errno(err);
3665                         }
3666                 }
3667                 break;
3668
3669         case NETDEV_PRE_TYPE_CHANGE:
3670         case NETDEV_POST_TYPE_CHANGE:
3671                 if (idev)
3672                         addrconf_type_change(dev, event);
3673                 break;
3674
3675         case NETDEV_CHANGEUPPER:
3676                 info = ptr;
3677
3678                 /* flush all routes if dev is linked to or unlinked from
3679                  * an L3 master device (e.g., VRF)
3680                  */
3681                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3682                         addrconf_ifdown(dev, false);
3683         }
3684
3685         return NOTIFY_OK;
3686 }
3687
3688 /*
3689  *      addrconf module should be notified of a device going up
3690  */
3691 static struct notifier_block ipv6_dev_notf = {
3692         .notifier_call = addrconf_notify,
3693         .priority = ADDRCONF_NOTIFY_PRIORITY,
3694 };
3695
3696 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3697 {
3698         struct inet6_dev *idev;
3699         ASSERT_RTNL();
3700
3701         idev = __in6_dev_get(dev);
3702
3703         if (event == NETDEV_POST_TYPE_CHANGE)
3704                 ipv6_mc_remap(idev);
3705         else if (event == NETDEV_PRE_TYPE_CHANGE)
3706                 ipv6_mc_unmap(idev);
3707 }
3708
3709 static bool addr_is_local(const struct in6_addr *addr)
3710 {
3711         return ipv6_addr_type(addr) &
3712                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3713 }
3714
3715 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3716 {
3717         unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3718         struct net *net = dev_net(dev);
3719         struct inet6_dev *idev;
3720         struct inet6_ifaddr *ifa, *tmp;
3721         bool keep_addr = false;
3722         int state, i;
3723
3724         ASSERT_RTNL();
3725
3726         rt6_disable_ip(dev, event);
3727
3728         idev = __in6_dev_get(dev);
3729         if (!idev)
3730                 return -ENODEV;
3731
3732         /*
3733          * Step 1: remove reference to ipv6 device from parent device.
3734          *         Do not dev_put!
3735          */
3736         if (unregister) {
3737                 idev->dead = 1;
3738
3739                 /* protected by rtnl_lock */
3740                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3741
3742                 /* Step 1.5: remove snmp6 entry */
3743                 snmp6_unregister_dev(idev);
3744
3745         }
3746
3747         /* combine the user config with event to determine if permanent
3748          * addresses are to be removed from address hash table
3749          */
3750         if (!unregister && !idev->cnf.disable_ipv6) {
3751                 /* aggregate the system setting and interface setting */
3752                 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3753
3754                 if (!_keep_addr)
3755                         _keep_addr = idev->cnf.keep_addr_on_down;
3756
3757                 keep_addr = (_keep_addr > 0);
3758         }
3759
3760         /* Step 2: clear hash table */
3761         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3762                 struct hlist_head *h = &inet6_addr_lst[i];
3763
3764                 spin_lock_bh(&addrconf_hash_lock);
3765 restart:
3766                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3767                         if (ifa->idev == idev) {
3768                                 addrconf_del_dad_work(ifa);
3769                                 /* combined flag + permanent flag decide if
3770                                  * address is retained on a down event
3771                                  */
3772                                 if (!keep_addr ||
3773                                     !(ifa->flags & IFA_F_PERMANENT) ||
3774                                     addr_is_local(&ifa->addr)) {
3775                                         hlist_del_init_rcu(&ifa->addr_lst);
3776                                         goto restart;
3777                                 }
3778                         }
3779                 }
3780                 spin_unlock_bh(&addrconf_hash_lock);
3781         }
3782
3783         write_lock_bh(&idev->lock);
3784
3785         addrconf_del_rs_timer(idev);
3786
3787         /* Step 2: clear flags for stateless addrconf */
3788         if (!unregister)
3789                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3790
3791         /* Step 3: clear tempaddr list */
3792         while (!list_empty(&idev->tempaddr_list)) {
3793                 ifa = list_first_entry(&idev->tempaddr_list,
3794                                        struct inet6_ifaddr, tmp_list);
3795                 list_del(&ifa->tmp_list);
3796                 write_unlock_bh(&idev->lock);
3797                 spin_lock_bh(&ifa->lock);
3798
3799                 if (ifa->ifpub) {
3800                         in6_ifa_put(ifa->ifpub);
3801                         ifa->ifpub = NULL;
3802                 }
3803                 spin_unlock_bh(&ifa->lock);
3804                 in6_ifa_put(ifa);
3805                 write_lock_bh(&idev->lock);
3806         }
3807
3808         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3809                 struct fib6_info *rt = NULL;
3810                 bool keep;
3811
3812                 addrconf_del_dad_work(ifa);
3813
3814                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3815                         !addr_is_local(&ifa->addr);
3816
3817                 write_unlock_bh(&idev->lock);
3818                 spin_lock_bh(&ifa->lock);
3819
3820                 if (keep) {
3821                         /* set state to skip the notifier below */
3822                         state = INET6_IFADDR_STATE_DEAD;
3823                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3824                         if (!(ifa->flags & IFA_F_NODAD))
3825                                 ifa->flags |= IFA_F_TENTATIVE;
3826
3827                         rt = ifa->rt;
3828                         ifa->rt = NULL;
3829                 } else {
3830                         state = ifa->state;
3831                         ifa->state = INET6_IFADDR_STATE_DEAD;
3832                 }
3833
3834                 spin_unlock_bh(&ifa->lock);
3835
3836                 if (rt)
3837                         ip6_del_rt(net, rt, false);
3838
3839                 if (state != INET6_IFADDR_STATE_DEAD) {
3840                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3841                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3842                 } else {
3843                         if (idev->cnf.forwarding)
3844                                 addrconf_leave_anycast(ifa);
3845                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3846                 }
3847
3848                 write_lock_bh(&idev->lock);
3849                 if (!keep) {
3850                         list_del_rcu(&ifa->if_list);
3851                         in6_ifa_put(ifa);
3852                 }
3853         }
3854
3855         write_unlock_bh(&idev->lock);
3856
3857         /* Step 5: Discard anycast and multicast list */
3858         if (unregister) {
3859                 ipv6_ac_destroy_dev(idev);
3860                 ipv6_mc_destroy_dev(idev);
3861         } else {
3862                 ipv6_mc_down(idev);
3863         }
3864
3865         idev->tstamp = jiffies;
3866         idev->ra_mtu = 0;
3867
3868         /* Last: Shot the device (if unregistered) */
3869         if (unregister) {
3870                 addrconf_sysctl_unregister(idev);
3871                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3872                 neigh_ifdown(&nd_tbl, dev);
3873                 in6_dev_put(idev);
3874         }
3875         return 0;
3876 }
3877
3878 static void addrconf_rs_timer(struct timer_list *t)
3879 {
3880         struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3881         struct net_device *dev = idev->dev;
3882         struct in6_addr lladdr;
3883
3884         write_lock(&idev->lock);
3885         if (idev->dead || !(idev->if_flags & IF_READY))
3886                 goto out;
3887
3888         if (!ipv6_accept_ra(idev))
3889                 goto out;
3890
3891         /* Announcement received after solicitation was sent */
3892         if (idev->if_flags & IF_RA_RCVD)
3893                 goto out;
3894
3895         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3896                 write_unlock(&idev->lock);
3897                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3898                         ndisc_send_rs(dev, &lladdr,
3899                                       &in6addr_linklocal_allrouters);
3900                 else
3901                         goto put;
3902
3903                 write_lock(&idev->lock);
3904                 idev->rs_interval = rfc3315_s14_backoff_update(
3905                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3906                 /* The wait after the last probe can be shorter */
3907                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3908                                              idev->cnf.rtr_solicits) ?
3909                                       idev->cnf.rtr_solicit_delay :
3910                                       idev->rs_interval);
3911         } else {
3912                 /*
3913                  * Note: we do not support deprecated "all on-link"
3914                  * assumption any longer.
3915                  */
3916                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3917         }
3918
3919 out:
3920         write_unlock(&idev->lock);
3921 put:
3922         in6_dev_put(idev);
3923 }
3924
3925 /*
3926  *      Duplicate Address Detection
3927  */
3928 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3929 {
3930         unsigned long rand_num;
3931         struct inet6_dev *idev = ifp->idev;
3932         u64 nonce;
3933
3934         if (ifp->flags & IFA_F_OPTIMISTIC)
3935                 rand_num = 0;
3936         else
3937                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3938
3939         nonce = 0;
3940         if (idev->cnf.enhanced_dad ||
3941             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3942                 do
3943                         get_random_bytes(&nonce, 6);
3944                 while (nonce == 0);
3945         }
3946         ifp->dad_nonce = nonce;
3947         ifp->dad_probes = idev->cnf.dad_transmits;
3948         addrconf_mod_dad_work(ifp, rand_num);
3949 }
3950
3951 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3952 {
3953         struct inet6_dev *idev = ifp->idev;
3954         struct net_device *dev = idev->dev;
3955         bool bump_id, notify = false;
3956         struct net *net;
3957
3958         addrconf_join_solict(dev, &ifp->addr);
3959
3960         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3961
3962         read_lock_bh(&idev->lock);
3963         spin_lock(&ifp->lock);
3964         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3965                 goto out;
3966
3967         net = dev_net(dev);
3968         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3969             (net->ipv6.devconf_all->accept_dad < 1 &&
3970              idev->cnf.accept_dad < 1) ||
3971             !(ifp->flags&IFA_F_TENTATIVE) ||
3972             ifp->flags & IFA_F_NODAD) {
3973                 bool send_na = false;
3974
3975                 if (ifp->flags & IFA_F_TENTATIVE &&
3976                     !(ifp->flags & IFA_F_OPTIMISTIC))
3977                         send_na = true;
3978                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3979                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3980                 spin_unlock(&ifp->lock);
3981                 read_unlock_bh(&idev->lock);
3982
3983                 addrconf_dad_completed(ifp, bump_id, send_na);
3984                 return;
3985         }
3986
3987         if (!(idev->if_flags & IF_READY)) {
3988                 spin_unlock(&ifp->lock);
3989                 read_unlock_bh(&idev->lock);
3990                 /*
3991                  * If the device is not ready:
3992                  * - keep it tentative if it is a permanent address.
3993                  * - otherwise, kill it.
3994                  */
3995                 in6_ifa_hold(ifp);
3996                 addrconf_dad_stop(ifp, 0);
3997                 return;
3998         }
3999
4000         /*
4001          * Optimistic nodes can start receiving
4002          * Frames right away
4003          */
4004         if (ifp->flags & IFA_F_OPTIMISTIC) {
4005                 ip6_ins_rt(net, ifp->rt);
4006                 if (ipv6_use_optimistic_addr(net, idev)) {
4007                         /* Because optimistic nodes can use this address,
4008                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
4009                          */
4010                         notify = true;
4011                 }
4012         }
4013
4014         addrconf_dad_kick(ifp);
4015 out:
4016         spin_unlock(&ifp->lock);
4017         read_unlock_bh(&idev->lock);
4018         if (notify)
4019                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4020 }
4021
4022 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4023 {
4024         bool begin_dad = false;
4025
4026         spin_lock_bh(&ifp->lock);
4027         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4028                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4029                 begin_dad = true;
4030         }
4031         spin_unlock_bh(&ifp->lock);
4032
4033         if (begin_dad)
4034                 addrconf_mod_dad_work(ifp, 0);
4035 }
4036
4037 static void addrconf_dad_work(struct work_struct *w)
4038 {
4039         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4040                                                 struct inet6_ifaddr,
4041                                                 dad_work);
4042         struct inet6_dev *idev = ifp->idev;
4043         bool bump_id, disable_ipv6 = false;
4044         struct in6_addr mcaddr;
4045
4046         enum {
4047                 DAD_PROCESS,
4048                 DAD_BEGIN,
4049                 DAD_ABORT,
4050         } action = DAD_PROCESS;
4051
4052         rtnl_lock();
4053
4054         spin_lock_bh(&ifp->lock);
4055         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4056                 action = DAD_BEGIN;
4057                 ifp->state = INET6_IFADDR_STATE_DAD;
4058         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4059                 action = DAD_ABORT;
4060                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4061
4062                 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4063                      idev->cnf.accept_dad > 1) &&
4064                     !idev->cnf.disable_ipv6 &&
4065                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4066                         struct in6_addr addr;
4067
4068                         addr.s6_addr32[0] = htonl(0xfe800000);
4069                         addr.s6_addr32[1] = 0;
4070
4071                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4072                             ipv6_addr_equal(&ifp->addr, &addr)) {
4073                                 /* DAD failed for link-local based on MAC */
4074                                 idev->cnf.disable_ipv6 = 1;
4075
4076                                 pr_info("%s: IPv6 being disabled!\n",
4077                                         ifp->idev->dev->name);
4078                                 disable_ipv6 = true;
4079                         }
4080                 }
4081         }
4082         spin_unlock_bh(&ifp->lock);
4083
4084         if (action == DAD_BEGIN) {
4085                 addrconf_dad_begin(ifp);
4086                 goto out;
4087         } else if (action == DAD_ABORT) {
4088                 in6_ifa_hold(ifp);
4089                 addrconf_dad_stop(ifp, 1);
4090                 if (disable_ipv6)
4091                         addrconf_ifdown(idev->dev, false);
4092                 goto out;
4093         }
4094
4095         if (!ifp->dad_probes && addrconf_dad_end(ifp))
4096                 goto out;
4097
4098         write_lock_bh(&idev->lock);
4099         if (idev->dead || !(idev->if_flags & IF_READY)) {
4100                 write_unlock_bh(&idev->lock);
4101                 goto out;
4102         }
4103
4104         spin_lock(&ifp->lock);
4105         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4106                 spin_unlock(&ifp->lock);
4107                 write_unlock_bh(&idev->lock);
4108                 goto out;
4109         }
4110
4111         if (ifp->dad_probes == 0) {
4112                 bool send_na = false;
4113
4114                 /*
4115                  * DAD was successful
4116                  */
4117
4118                 if (ifp->flags & IFA_F_TENTATIVE &&
4119                     !(ifp->flags & IFA_F_OPTIMISTIC))
4120                         send_na = true;
4121                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4122                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4123                 spin_unlock(&ifp->lock);
4124                 write_unlock_bh(&idev->lock);
4125
4126                 addrconf_dad_completed(ifp, bump_id, send_na);
4127
4128                 goto out;
4129         }
4130
4131         ifp->dad_probes--;
4132         addrconf_mod_dad_work(ifp,
4133                               max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4134                                   HZ/100));
4135         spin_unlock(&ifp->lock);
4136         write_unlock_bh(&idev->lock);
4137
4138         /* send a neighbour solicitation for our addr */
4139         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4140         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4141                       ifp->dad_nonce);
4142 out:
4143         in6_ifa_put(ifp);
4144         rtnl_unlock();
4145 }
4146
4147 /* ifp->idev must be at least read locked */
4148 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4149 {
4150         struct inet6_ifaddr *ifpiter;
4151         struct inet6_dev *idev = ifp->idev;
4152
4153         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4154                 if (ifpiter->scope > IFA_LINK)
4155                         break;
4156                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4157                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4158                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4159                     IFA_F_PERMANENT)
4160                         return false;
4161         }
4162         return true;
4163 }
4164
4165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4166                                    bool send_na)
4167 {
4168         struct net_device *dev = ifp->idev->dev;
4169         struct in6_addr lladdr;
4170         bool send_rs, send_mld;
4171
4172         addrconf_del_dad_work(ifp);
4173
4174         /*
4175          *      Configure the address for reception. Now it is valid.
4176          */
4177
4178         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4179
4180         /* If added prefix is link local and we are prepared to process
4181            router advertisements, start sending router solicitations.
4182          */
4183
4184         read_lock_bh(&ifp->idev->lock);
4185         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4186         send_rs = send_mld &&
4187                   ipv6_accept_ra(ifp->idev) &&
4188                   ifp->idev->cnf.rtr_solicits != 0 &&
4189                   (dev->flags&IFF_LOOPBACK) == 0;
4190         read_unlock_bh(&ifp->idev->lock);
4191
4192         /* While dad is in progress mld report's source address is in6_addrany.
4193          * Resend with proper ll now.
4194          */
4195         if (send_mld)
4196                 ipv6_mc_dad_complete(ifp->idev);
4197
4198         /* send unsolicited NA if enabled */
4199         if (send_na &&
4200             (ifp->idev->cnf.ndisc_notify ||
4201              dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4202                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4203                               /*router=*/ !!ifp->idev->cnf.forwarding,
4204                               /*solicited=*/ false, /*override=*/ true,
4205                               /*inc_opt=*/ true);
4206         }
4207
4208         if (send_rs) {
4209                 /*
4210                  *      If a host as already performed a random delay
4211                  *      [...] as part of DAD [...] there is no need
4212                  *      to delay again before sending the first RS
4213                  */
4214                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4215                         return;
4216                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4217
4218                 write_lock_bh(&ifp->idev->lock);
4219                 spin_lock(&ifp->lock);
4220                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4221                         ifp->idev->cnf.rtr_solicit_interval);
4222                 ifp->idev->rs_probes = 1;
4223                 ifp->idev->if_flags |= IF_RS_SENT;
4224                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4225                 spin_unlock(&ifp->lock);
4226                 write_unlock_bh(&ifp->idev->lock);
4227         }
4228
4229         if (bump_id)
4230                 rt_genid_bump_ipv6(dev_net(dev));
4231
4232         /* Make sure that a new temporary address will be created
4233          * before this temporary address becomes deprecated.
4234          */
4235         if (ifp->flags & IFA_F_TEMPORARY)
4236                 addrconf_verify_rtnl();
4237 }
4238
4239 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4240 {
4241         struct inet6_ifaddr *ifp;
4242
4243         read_lock_bh(&idev->lock);
4244         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4245                 spin_lock(&ifp->lock);
4246                 if ((ifp->flags & IFA_F_TENTATIVE &&
4247                      ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4248                         if (restart)
4249                                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4250                         addrconf_dad_kick(ifp);
4251                 }
4252                 spin_unlock(&ifp->lock);
4253         }
4254         read_unlock_bh(&idev->lock);
4255 }
4256
4257 #ifdef CONFIG_PROC_FS
4258 struct if6_iter_state {
4259         struct seq_net_private p;
4260         int bucket;
4261         int offset;
4262 };
4263
4264 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4265 {
4266         struct if6_iter_state *state = seq->private;
4267         struct net *net = seq_file_net(seq);
4268         struct inet6_ifaddr *ifa = NULL;
4269         int p = 0;
4270
4271         /* initial bucket if pos is 0 */
4272         if (pos == 0) {
4273                 state->bucket = 0;
4274                 state->offset = 0;
4275         }
4276
4277         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4278                 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4279                                          addr_lst) {
4280                         if (!net_eq(dev_net(ifa->idev->dev), net))
4281                                 continue;
4282                         /* sync with offset */
4283                         if (p < state->offset) {
4284                                 p++;
4285                                 continue;
4286                         }
4287                         return ifa;
4288                 }
4289
4290                 /* prepare for next bucket */
4291                 state->offset = 0;
4292                 p = 0;
4293         }
4294         return NULL;
4295 }
4296
4297 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4298                                          struct inet6_ifaddr *ifa)
4299 {
4300         struct if6_iter_state *state = seq->private;
4301         struct net *net = seq_file_net(seq);
4302
4303         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4304                 if (!net_eq(dev_net(ifa->idev->dev), net))
4305                         continue;
4306                 state->offset++;
4307                 return ifa;
4308         }
4309
4310         state->offset = 0;
4311         while (++state->bucket < IN6_ADDR_HSIZE) {
4312                 hlist_for_each_entry_rcu(ifa,
4313                                      &inet6_addr_lst[state->bucket], addr_lst) {
4314                         if (!net_eq(dev_net(ifa->idev->dev), net))
4315                                 continue;
4316                         return ifa;
4317                 }
4318         }
4319
4320         return NULL;
4321 }
4322
4323 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4324         __acquires(rcu)
4325 {
4326         rcu_read_lock();
4327         return if6_get_first(seq, *pos);
4328 }
4329
4330 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4331 {
4332         struct inet6_ifaddr *ifa;
4333
4334         ifa = if6_get_next(seq, v);
4335         ++*pos;
4336         return ifa;
4337 }
4338
4339 static void if6_seq_stop(struct seq_file *seq, void *v)
4340         __releases(rcu)
4341 {
4342         rcu_read_unlock();
4343 }
4344
4345 static int if6_seq_show(struct seq_file *seq, void *v)
4346 {
4347         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4348         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4349                    &ifp->addr,
4350                    ifp->idev->dev->ifindex,
4351                    ifp->prefix_len,
4352                    ifp->scope,
4353                    (u8) ifp->flags,
4354                    ifp->idev->dev->name);
4355         return 0;
4356 }
4357
4358 static const struct seq_operations if6_seq_ops = {
4359         .start  = if6_seq_start,
4360         .next   = if6_seq_next,
4361         .show   = if6_seq_show,
4362         .stop   = if6_seq_stop,
4363 };
4364
4365 static int __net_init if6_proc_net_init(struct net *net)
4366 {
4367         if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4368                         sizeof(struct if6_iter_state)))
4369                 return -ENOMEM;
4370         return 0;
4371 }
4372
4373 static void __net_exit if6_proc_net_exit(struct net *net)
4374 {
4375         remove_proc_entry("if_inet6", net->proc_net);
4376 }
4377
4378 static struct pernet_operations if6_proc_net_ops = {
4379         .init = if6_proc_net_init,
4380         .exit = if6_proc_net_exit,
4381 };
4382
4383 int __init if6_proc_init(void)
4384 {
4385         return register_pernet_subsys(&if6_proc_net_ops);
4386 }
4387
4388 void if6_proc_exit(void)
4389 {
4390         unregister_pernet_subsys(&if6_proc_net_ops);
4391 }
4392 #endif  /* CONFIG_PROC_FS */
4393
4394 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4395 /* Check if address is a home address configured on any interface. */
4396 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4397 {
4398         unsigned int hash = inet6_addr_hash(net, addr);
4399         struct inet6_ifaddr *ifp = NULL;
4400         int ret = 0;
4401
4402         rcu_read_lock();
4403         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4404                 if (!net_eq(dev_net(ifp->idev->dev), net))
4405                         continue;
4406                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4407                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4408                         ret = 1;
4409                         break;
4410                 }
4411         }
4412         rcu_read_unlock();
4413         return ret;
4414 }
4415 #endif
4416
4417 /* RFC6554 has some algorithm to avoid loops in segment routing by
4418  * checking if the segments contains any of a local interface address.
4419  *
4420  * Quote:
4421  *
4422  * To detect loops in the SRH, a router MUST determine if the SRH
4423  * includes multiple addresses assigned to any interface on that router.
4424  * If such addresses appear more than once and are separated by at least
4425  * one address not assigned to that router.
4426  */
4427 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4428                           unsigned char nsegs)
4429 {
4430         const struct in6_addr *addr;
4431         int i, ret = 0, found = 0;
4432         struct inet6_ifaddr *ifp;
4433         bool separated = false;
4434         unsigned int hash;
4435         bool hash_found;
4436
4437         rcu_read_lock();
4438         for (i = 0; i < nsegs; i++) {
4439                 addr = &segs[i];
4440                 hash = inet6_addr_hash(net, addr);
4441
4442                 hash_found = false;
4443                 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4444                         if (!net_eq(dev_net(ifp->idev->dev), net))
4445                                 continue;
4446
4447                         if (ipv6_addr_equal(&ifp->addr, addr)) {
4448                                 hash_found = true;
4449                                 break;
4450                         }
4451                 }
4452
4453                 if (hash_found) {
4454                         if (found > 1 && separated) {
4455                                 ret = 1;
4456                                 break;
4457                         }
4458
4459                         separated = false;
4460                         found++;
4461                 } else {
4462                         separated = true;
4463                 }
4464         }
4465         rcu_read_unlock();
4466
4467         return ret;
4468 }
4469
4470 /*
4471  *      Periodic address status verification
4472  */
4473
4474 static void addrconf_verify_rtnl(void)
4475 {
4476         unsigned long now, next, next_sec, next_sched;
4477         struct inet6_ifaddr *ifp;
4478         int i;
4479
4480         ASSERT_RTNL();
4481
4482         rcu_read_lock_bh();
4483         now = jiffies;
4484         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4485
4486         cancel_delayed_work(&addr_chk_work);
4487
4488         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4489 restart:
4490                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4491                         unsigned long age;
4492
4493                         /* When setting preferred_lft to a value not zero or
4494                          * infinity, while valid_lft is infinity
4495                          * IFA_F_PERMANENT has a non-infinity life time.
4496                          */
4497                         if ((ifp->flags & IFA_F_PERMANENT) &&
4498                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4499                                 continue;
4500
4501                         spin_lock(&ifp->lock);
4502                         /* We try to batch several events at once. */
4503                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4504
4505                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4506                             age >= ifp->valid_lft) {
4507                                 spin_unlock(&ifp->lock);
4508                                 in6_ifa_hold(ifp);
4509                                 rcu_read_unlock_bh();
4510                                 ipv6_del_addr(ifp);
4511                                 rcu_read_lock_bh();
4512                                 goto restart;
4513                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4514                                 spin_unlock(&ifp->lock);
4515                                 continue;
4516                         } else if (age >= ifp->prefered_lft) {
4517                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4518                                 int deprecate = 0;
4519
4520                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4521                                         deprecate = 1;
4522                                         ifp->flags |= IFA_F_DEPRECATED;
4523                                 }
4524
4525                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4526                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4527                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4528
4529                                 spin_unlock(&ifp->lock);
4530
4531                                 if (deprecate) {
4532                                         in6_ifa_hold(ifp);
4533
4534                                         ipv6_ifa_notify(0, ifp);
4535                                         in6_ifa_put(ifp);
4536                                         goto restart;
4537                                 }
4538                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4539                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4540                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4541                                         ifp->idev->cnf.dad_transmits *
4542                                         max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4543
4544                                 if (age >= ifp->prefered_lft - regen_advance) {
4545                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4546                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4547                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4548                                         if (!ifp->regen_count && ifpub) {
4549                                                 ifp->regen_count++;
4550                                                 in6_ifa_hold(ifp);
4551                                                 in6_ifa_hold(ifpub);
4552                                                 spin_unlock(&ifp->lock);
4553
4554                                                 spin_lock(&ifpub->lock);
4555                                                 ifpub->regen_count = 0;
4556                                                 spin_unlock(&ifpub->lock);
4557                                                 rcu_read_unlock_bh();
4558                                                 ipv6_create_tempaddr(ifpub, true);
4559                                                 in6_ifa_put(ifpub);
4560                                                 in6_ifa_put(ifp);
4561                                                 rcu_read_lock_bh();
4562                                                 goto restart;
4563                                         }
4564                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4565                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4566                                 spin_unlock(&ifp->lock);
4567                         } else {
4568                                 /* ifp->prefered_lft <= ifp->valid_lft */
4569                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4570                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4571                                 spin_unlock(&ifp->lock);
4572                         }
4573                 }
4574         }
4575
4576         next_sec = round_jiffies_up(next);
4577         next_sched = next;
4578
4579         /* If rounded timeout is accurate enough, accept it. */
4580         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4581                 next_sched = next_sec;
4582
4583         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4584         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4585                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4586
4587         pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4588                  now, next, next_sec, next_sched);
4589         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4590         rcu_read_unlock_bh();
4591 }
4592
4593 static void addrconf_verify_work(struct work_struct *w)
4594 {
4595         rtnl_lock();
4596         addrconf_verify_rtnl();
4597         rtnl_unlock();
4598 }
4599
4600 static void addrconf_verify(void)
4601 {
4602         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4603 }
4604
4605 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4606                                      struct in6_addr **peer_pfx)
4607 {
4608         struct in6_addr *pfx = NULL;
4609
4610         *peer_pfx = NULL;
4611
4612         if (addr)
4613                 pfx = nla_data(addr);
4614
4615         if (local) {
4616                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4617                         *peer_pfx = pfx;
4618                 pfx = nla_data(local);
4619         }
4620
4621         return pfx;
4622 }
4623
4624 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4625         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4626         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4627         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4628         [IFA_FLAGS]             = { .len = sizeof(u32) },
4629         [IFA_RT_PRIORITY]       = { .len = sizeof(u32) },
4630         [IFA_TARGET_NETNSID]    = { .type = NLA_S32 },
4631 };
4632
4633 static int
4634 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4635                   struct netlink_ext_ack *extack)
4636 {
4637         struct net *net = sock_net(skb->sk);
4638         struct ifaddrmsg *ifm;
4639         struct nlattr *tb[IFA_MAX+1];
4640         struct in6_addr *pfx, *peer_pfx;
4641         u32 ifa_flags;
4642         int err;
4643
4644         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4645                                      ifa_ipv6_policy, extack);
4646         if (err < 0)
4647                 return err;
4648
4649         ifm = nlmsg_data(nlh);
4650         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4651         if (!pfx)
4652                 return -EINVAL;
4653
4654         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4655
4656         /* We ignore other flags so far. */
4657         ifa_flags &= IFA_F_MANAGETEMPADDR;
4658
4659         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4660                               ifm->ifa_prefixlen);
4661 }
4662
4663 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4664                                unsigned long expires, u32 flags,
4665                                bool modify_peer)
4666 {
4667         struct fib6_info *f6i;
4668         u32 prio;
4669
4670         f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4671                                         ifp->prefix_len,
4672                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
4673         if (!f6i)
4674                 return -ENOENT;
4675
4676         prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4677         if (f6i->fib6_metric != prio) {
4678                 /* delete old one */
4679                 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4680
4681                 /* add new one */
4682                 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4683                                       ifp->prefix_len,
4684                                       ifp->rt_priority, ifp->idev->dev,
4685                                       expires, flags, GFP_KERNEL);
4686         } else {
4687                 if (!expires)
4688                         fib6_clean_expires(f6i);
4689                 else
4690                         fib6_set_expires(f6i, expires);
4691
4692                 fib6_info_release(f6i);
4693         }
4694
4695         return 0;
4696 }
4697
4698 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4699 {
4700         u32 flags;
4701         clock_t expires;
4702         unsigned long timeout;
4703         bool was_managetempaddr;
4704         bool had_prefixroute;
4705         bool new_peer = false;
4706
4707         ASSERT_RTNL();
4708
4709         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4710                 return -EINVAL;
4711
4712         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4713             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4714                 return -EINVAL;
4715
4716         if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4717                 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4718
4719         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4720         if (addrconf_finite_timeout(timeout)) {
4721                 expires = jiffies_to_clock_t(timeout * HZ);
4722                 cfg->valid_lft = timeout;
4723                 flags = RTF_EXPIRES;
4724         } else {
4725                 expires = 0;
4726                 flags = 0;
4727                 cfg->ifa_flags |= IFA_F_PERMANENT;
4728         }
4729
4730         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4731         if (addrconf_finite_timeout(timeout)) {
4732                 if (timeout == 0)
4733                         cfg->ifa_flags |= IFA_F_DEPRECATED;
4734                 cfg->preferred_lft = timeout;
4735         }
4736
4737         if (cfg->peer_pfx &&
4738             memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4739                 if (!ipv6_addr_any(&ifp->peer_addr))
4740                         cleanup_prefix_route(ifp, expires, true, true);
4741                 new_peer = true;
4742         }
4743
4744         spin_lock_bh(&ifp->lock);
4745         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4746         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4747                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4748         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4749                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4750                         IFA_F_NOPREFIXROUTE);
4751         ifp->flags |= cfg->ifa_flags;
4752         ifp->tstamp = jiffies;
4753         ifp->valid_lft = cfg->valid_lft;
4754         ifp->prefered_lft = cfg->preferred_lft;
4755
4756         if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4757                 ifp->rt_priority = cfg->rt_priority;
4758
4759         if (new_peer)
4760                 ifp->peer_addr = *cfg->peer_pfx;
4761
4762         spin_unlock_bh(&ifp->lock);
4763         if (!(ifp->flags&IFA_F_TENTATIVE))
4764                 ipv6_ifa_notify(0, ifp);
4765
4766         if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4767                 int rc = -ENOENT;
4768
4769                 if (had_prefixroute)
4770                         rc = modify_prefix_route(ifp, expires, flags, false);
4771
4772                 /* prefix route could have been deleted; if so restore it */
4773                 if (rc == -ENOENT) {
4774                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4775                                               ifp->rt_priority, ifp->idev->dev,
4776                                               expires, flags, GFP_KERNEL);
4777                 }
4778
4779                 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4780                         rc = modify_prefix_route(ifp, expires, flags, true);
4781
4782                 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4783                         addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4784                                               ifp->rt_priority, ifp->idev->dev,
4785                                               expires, flags, GFP_KERNEL);
4786                 }
4787         } else if (had_prefixroute) {
4788                 enum cleanup_prefix_rt_t action;
4789                 unsigned long rt_expires;
4790
4791                 write_lock_bh(&ifp->idev->lock);
4792                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4793                 write_unlock_bh(&ifp->idev->lock);
4794
4795                 if (action != CLEANUP_PREFIX_RT_NOP) {
4796                         cleanup_prefix_route(ifp, rt_expires,
4797                                 action == CLEANUP_PREFIX_RT_DEL, false);
4798                 }
4799         }
4800
4801         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4802                 if (was_managetempaddr &&
4803                     !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4804                         cfg->valid_lft = 0;
4805                         cfg->preferred_lft = 0;
4806                 }
4807                 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4808                                  cfg->preferred_lft, !was_managetempaddr,
4809                                  jiffies);
4810         }
4811
4812         addrconf_verify_rtnl();
4813
4814         return 0;
4815 }
4816
4817 static int
4818 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4819                   struct netlink_ext_ack *extack)
4820 {
4821         struct net *net = sock_net(skb->sk);
4822         struct ifaddrmsg *ifm;
4823         struct nlattr *tb[IFA_MAX+1];
4824         struct in6_addr *peer_pfx;
4825         struct inet6_ifaddr *ifa;
4826         struct net_device *dev;
4827         struct inet6_dev *idev;
4828         struct ifa6_config cfg;
4829         int err;
4830
4831         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4832                                      ifa_ipv6_policy, extack);
4833         if (err < 0)
4834                 return err;
4835
4836         memset(&cfg, 0, sizeof(cfg));
4837
4838         ifm = nlmsg_data(nlh);
4839         cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4840         if (!cfg.pfx)
4841                 return -EINVAL;
4842
4843         cfg.peer_pfx = peer_pfx;
4844         cfg.plen = ifm->ifa_prefixlen;
4845         if (tb[IFA_RT_PRIORITY])
4846                 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4847
4848         cfg.valid_lft = INFINITY_LIFE_TIME;
4849         cfg.preferred_lft = INFINITY_LIFE_TIME;
4850
4851         if (tb[IFA_CACHEINFO]) {
4852                 struct ifa_cacheinfo *ci;
4853
4854                 ci = nla_data(tb[IFA_CACHEINFO]);
4855                 cfg.valid_lft = ci->ifa_valid;
4856                 cfg.preferred_lft = ci->ifa_prefered;
4857         }
4858
4859         dev =  __dev_get_by_index(net, ifm->ifa_index);
4860         if (!dev)
4861                 return -ENODEV;
4862
4863         if (tb[IFA_FLAGS])
4864                 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4865         else
4866                 cfg.ifa_flags = ifm->ifa_flags;
4867
4868         /* We ignore other flags so far. */
4869         cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4870                          IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4871                          IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4872
4873         idev = ipv6_find_idev(dev);
4874         if (IS_ERR(idev))
4875                 return PTR_ERR(idev);
4876
4877         if (!ipv6_allow_optimistic_dad(net, idev))
4878                 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4879
4880         if (cfg.ifa_flags & IFA_F_NODAD &&
4881             cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4882                 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4883                 return -EINVAL;
4884         }
4885
4886         ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4887         if (!ifa) {
4888                 /*
4889                  * It would be best to check for !NLM_F_CREATE here but
4890                  * userspace already relies on not having to provide this.
4891                  */
4892                 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4893         }
4894
4895         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4896             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4897                 err = -EEXIST;
4898         else
4899                 err = inet6_addr_modify(ifa, &cfg);
4900
4901         in6_ifa_put(ifa);
4902
4903         return err;
4904 }
4905
4906 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4907                           u8 scope, int ifindex)
4908 {
4909         struct ifaddrmsg *ifm;
4910
4911         ifm = nlmsg_data(nlh);
4912         ifm->ifa_family = AF_INET6;
4913         ifm->ifa_prefixlen = prefixlen;
4914         ifm->ifa_flags = flags;
4915         ifm->ifa_scope = scope;
4916         ifm->ifa_index = ifindex;
4917 }
4918
4919 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4920                          unsigned long tstamp, u32 preferred, u32 valid)
4921 {
4922         struct ifa_cacheinfo ci;
4923
4924         ci.cstamp = cstamp_delta(cstamp);
4925         ci.tstamp = cstamp_delta(tstamp);
4926         ci.ifa_prefered = preferred;
4927         ci.ifa_valid = valid;
4928
4929         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4930 }
4931
4932 static inline int rt_scope(int ifa_scope)
4933 {
4934         if (ifa_scope & IFA_HOST)
4935                 return RT_SCOPE_HOST;
4936         else if (ifa_scope & IFA_LINK)
4937                 return RT_SCOPE_LINK;
4938         else if (ifa_scope & IFA_SITE)
4939                 return RT_SCOPE_SITE;
4940         else
4941                 return RT_SCOPE_UNIVERSE;
4942 }
4943
4944 static inline int inet6_ifaddr_msgsize(void)
4945 {
4946         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4947                + nla_total_size(16) /* IFA_LOCAL */
4948                + nla_total_size(16) /* IFA_ADDRESS */
4949                + nla_total_size(sizeof(struct ifa_cacheinfo))
4950                + nla_total_size(4)  /* IFA_FLAGS */
4951                + nla_total_size(4)  /* IFA_RT_PRIORITY */;
4952 }
4953
4954 enum addr_type_t {
4955         UNICAST_ADDR,
4956         MULTICAST_ADDR,
4957         ANYCAST_ADDR,
4958 };
4959
4960 struct inet6_fill_args {
4961         u32 portid;
4962         u32 seq;
4963         int event;
4964         unsigned int flags;
4965         int netnsid;
4966         int ifindex;
4967         enum addr_type_t type;
4968 };
4969
4970 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4971                              struct inet6_fill_args *args)
4972 {
4973         struct nlmsghdr  *nlh;
4974         u32 preferred, valid;
4975
4976         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4977                         sizeof(struct ifaddrmsg), args->flags);
4978         if (!nlh)
4979                 return -EMSGSIZE;
4980
4981         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4982                       ifa->idev->dev->ifindex);
4983
4984         if (args->netnsid >= 0 &&
4985             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4986                 goto error;
4987
4988         if (!((ifa->flags&IFA_F_PERMANENT) &&
4989               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4990                 preferred = ifa->prefered_lft;
4991                 valid = ifa->valid_lft;
4992                 if (preferred != INFINITY_LIFE_TIME) {
4993                         long tval = (jiffies - ifa->tstamp)/HZ;
4994                         if (preferred > tval)
4995                                 preferred -= tval;
4996                         else
4997                                 preferred = 0;
4998                         if (valid != INFINITY_LIFE_TIME) {
4999                                 if (valid > tval)
5000                                         valid -= tval;
5001                                 else
5002                                         valid = 0;
5003                         }
5004                 }
5005         } else {
5006                 preferred = INFINITY_LIFE_TIME;
5007                 valid = INFINITY_LIFE_TIME;
5008         }
5009
5010         if (!ipv6_addr_any(&ifa->peer_addr)) {
5011                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5012                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5013                         goto error;
5014         } else
5015                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5016                         goto error;
5017
5018         if (ifa->rt_priority &&
5019             nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5020                 goto error;
5021
5022         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5023                 goto error;
5024
5025         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5026                 goto error;
5027
5028         nlmsg_end(skb, nlh);
5029         return 0;
5030
5031 error:
5032         nlmsg_cancel(skb, nlh);
5033         return -EMSGSIZE;
5034 }
5035
5036 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5037                                struct inet6_fill_args *args)
5038 {
5039         struct nlmsghdr  *nlh;
5040         u8 scope = RT_SCOPE_UNIVERSE;
5041         int ifindex = ifmca->idev->dev->ifindex;
5042
5043         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5044                 scope = RT_SCOPE_SITE;
5045
5046         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5047                         sizeof(struct ifaddrmsg), args->flags);
5048         if (!nlh)
5049                 return -EMSGSIZE;
5050
5051         if (args->netnsid >= 0 &&
5052             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5053                 nlmsg_cancel(skb, nlh);
5054                 return -EMSGSIZE;
5055         }
5056
5057         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5058         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5059             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5060                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5061                 nlmsg_cancel(skb, nlh);
5062                 return -EMSGSIZE;
5063         }
5064
5065         nlmsg_end(skb, nlh);
5066         return 0;
5067 }
5068
5069 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5070                                struct inet6_fill_args *args)
5071 {
5072         struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5073         int ifindex = dev ? dev->ifindex : 1;
5074         struct nlmsghdr  *nlh;
5075         u8 scope = RT_SCOPE_UNIVERSE;
5076
5077         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5078                 scope = RT_SCOPE_SITE;
5079
5080         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5081                         sizeof(struct ifaddrmsg), args->flags);
5082         if (!nlh)
5083                 return -EMSGSIZE;
5084
5085         if (args->netnsid >= 0 &&
5086             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5087                 nlmsg_cancel(skb, nlh);
5088                 return -EMSGSIZE;
5089         }
5090
5091         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5092         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5093             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5094                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5095                 nlmsg_cancel(skb, nlh);
5096                 return -EMSGSIZE;
5097         }
5098
5099         nlmsg_end(skb, nlh);
5100         return 0;
5101 }
5102
5103 /* called with rcu_read_lock() */
5104 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5105                           struct netlink_callback *cb, int s_ip_idx,
5106                           struct inet6_fill_args *fillargs)
5107 {
5108         struct ifmcaddr6 *ifmca;
5109         struct ifacaddr6 *ifaca;
5110         int ip_idx = 0;
5111         int err = 1;
5112
5113         read_lock_bh(&idev->lock);
5114         switch (fillargs->type) {
5115         case UNICAST_ADDR: {
5116                 struct inet6_ifaddr *ifa;
5117                 fillargs->event = RTM_NEWADDR;
5118
5119                 /* unicast address incl. temp addr */
5120                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5121                         if (ip_idx < s_ip_idx)
5122                                 goto next;
5123                         err = inet6_fill_ifaddr(skb, ifa, fillargs);
5124                         if (err < 0)
5125                                 break;
5126                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5127 next:
5128                         ip_idx++;
5129                 }
5130                 break;
5131         }
5132         case MULTICAST_ADDR:
5133                 read_unlock_bh(&idev->lock);
5134                 fillargs->event = RTM_GETMULTICAST;
5135
5136                 /* multicast address */
5137                 for (ifmca = rcu_dereference(idev->mc_list);
5138                      ifmca;
5139                      ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5140                         if (ip_idx < s_ip_idx)
5141                                 continue;
5142                         err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5143                         if (err < 0)
5144                                 break;
5145                 }
5146                 read_lock_bh(&idev->lock);
5147                 break;
5148         case ANYCAST_ADDR:
5149                 fillargs->event = RTM_GETANYCAST;
5150                 /* anycast address */
5151                 for (ifaca = idev->ac_list; ifaca;
5152                      ifaca = ifaca->aca_next, ip_idx++) {
5153                         if (ip_idx < s_ip_idx)
5154                                 continue;
5155                         err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5156                         if (err < 0)
5157                                 break;
5158                 }
5159                 break;
5160         default:
5161                 break;
5162         }
5163         read_unlock_bh(&idev->lock);
5164         cb->args[2] = ip_idx;
5165         return err;
5166 }
5167
5168 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5169                                        struct inet6_fill_args *fillargs,
5170                                        struct net **tgt_net, struct sock *sk,
5171                                        struct netlink_callback *cb)
5172 {
5173         struct netlink_ext_ack *extack = cb->extack;
5174         struct nlattr *tb[IFA_MAX+1];
5175         struct ifaddrmsg *ifm;
5176         int err, i;
5177
5178         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5179                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5180                 return -EINVAL;
5181         }
5182
5183         ifm = nlmsg_data(nlh);
5184         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5185                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5186                 return -EINVAL;
5187         }
5188
5189         fillargs->ifindex = ifm->ifa_index;
5190         if (fillargs->ifindex) {
5191                 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5192                 fillargs->flags |= NLM_F_DUMP_FILTERED;
5193         }
5194
5195         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5196                                             ifa_ipv6_policy, extack);
5197         if (err < 0)
5198                 return err;
5199
5200         for (i = 0; i <= IFA_MAX; ++i) {
5201                 if (!tb[i])
5202                         continue;
5203
5204                 if (i == IFA_TARGET_NETNSID) {
5205                         struct net *net;
5206
5207                         fillargs->netnsid = nla_get_s32(tb[i]);
5208                         net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5209                         if (IS_ERR(net)) {
5210                                 fillargs->netnsid = -1;
5211                                 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5212                                 return PTR_ERR(net);
5213                         }
5214                         *tgt_net = net;
5215                 } else {
5216                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5217                         return -EINVAL;
5218                 }
5219         }
5220
5221         return 0;
5222 }
5223
5224 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5225                            enum addr_type_t type)
5226 {
5227         const struct nlmsghdr *nlh = cb->nlh;
5228         struct inet6_fill_args fillargs = {
5229                 .portid = NETLINK_CB(cb->skb).portid,
5230                 .seq = cb->nlh->nlmsg_seq,
5231                 .flags = NLM_F_MULTI,
5232                 .netnsid = -1,
5233                 .type = type,
5234         };
5235         struct net *tgt_net = sock_net(skb->sk);
5236         int idx, s_idx, s_ip_idx;
5237         int h, s_h;
5238         struct net_device *dev;
5239         struct inet6_dev *idev;
5240         struct hlist_head *head;
5241         int err = 0;
5242
5243         s_h = cb->args[0];
5244         s_idx = idx = cb->args[1];
5245         s_ip_idx = cb->args[2];
5246
5247         if (cb->strict_check) {
5248                 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5249                                                   skb->sk, cb);
5250                 if (err < 0)
5251                         goto put_tgt_net;
5252
5253                 err = 0;
5254                 if (fillargs.ifindex) {
5255                         dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5256                         if (!dev) {
5257                                 err = -ENODEV;
5258                                 goto put_tgt_net;
5259                         }
5260                         idev = __in6_dev_get(dev);
5261                         if (idev) {
5262                                 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5263                                                      &fillargs);
5264                                 if (err > 0)
5265                                         err = 0;
5266                         }
5267                         goto put_tgt_net;
5268                 }
5269         }
5270
5271         rcu_read_lock();
5272         cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5273         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5274                 idx = 0;
5275                 head = &tgt_net->dev_index_head[h];
5276                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5277                         if (idx < s_idx)
5278                                 goto cont;
5279                         if (h > s_h || idx > s_idx)
5280                                 s_ip_idx = 0;
5281                         idev = __in6_dev_get(dev);
5282                         if (!idev)
5283                                 goto cont;
5284
5285                         if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5286                                            &fillargs) < 0)
5287                                 goto done;
5288 cont:
5289                         idx++;
5290                 }
5291         }
5292 done:
5293         rcu_read_unlock();
5294         cb->args[0] = h;
5295         cb->args[1] = idx;
5296 put_tgt_net:
5297         if (fillargs.netnsid >= 0)
5298                 put_net(tgt_net);
5299
5300         return skb->len ? : err;
5301 }
5302
5303 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5304 {
5305         enum addr_type_t type = UNICAST_ADDR;
5306
5307         return inet6_dump_addr(skb, cb, type);
5308 }
5309
5310 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5311 {
5312         enum addr_type_t type = MULTICAST_ADDR;
5313
5314         return inet6_dump_addr(skb, cb, type);
5315 }
5316
5317
5318 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5319 {
5320         enum addr_type_t type = ANYCAST_ADDR;
5321
5322         return inet6_dump_addr(skb, cb, type);
5323 }
5324
5325 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5326                                        const struct nlmsghdr *nlh,
5327                                        struct nlattr **tb,
5328                                        struct netlink_ext_ack *extack)
5329 {
5330         struct ifaddrmsg *ifm;
5331         int i, err;
5332
5333         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5334                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5335                 return -EINVAL;
5336         }
5337
5338         if (!netlink_strict_get_check(skb))
5339                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5340                                               ifa_ipv6_policy, extack);
5341
5342         ifm = nlmsg_data(nlh);
5343         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5344                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5345                 return -EINVAL;
5346         }
5347
5348         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5349                                             ifa_ipv6_policy, extack);
5350         if (err)
5351                 return err;
5352
5353         for (i = 0; i <= IFA_MAX; i++) {
5354                 if (!tb[i])
5355                         continue;
5356
5357                 switch (i) {
5358                 case IFA_TARGET_NETNSID:
5359                 case IFA_ADDRESS:
5360                 case IFA_LOCAL:
5361                         break;
5362                 default:
5363                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5364                         return -EINVAL;
5365                 }
5366         }
5367
5368         return 0;
5369 }
5370
5371 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5372                              struct netlink_ext_ack *extack)
5373 {
5374         struct net *tgt_net = sock_net(in_skb->sk);
5375         struct inet6_fill_args fillargs = {
5376                 .portid = NETLINK_CB(in_skb).portid,
5377                 .seq = nlh->nlmsg_seq,
5378                 .event = RTM_NEWADDR,
5379                 .flags = 0,
5380                 .netnsid = -1,
5381         };
5382         struct ifaddrmsg *ifm;
5383         struct nlattr *tb[IFA_MAX+1];
5384         struct in6_addr *addr = NULL, *peer;
5385         struct net_device *dev = NULL;
5386         struct inet6_ifaddr *ifa;
5387         struct sk_buff *skb;
5388         int err;
5389
5390         err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5391         if (err < 0)
5392                 return err;
5393
5394         if (tb[IFA_TARGET_NETNSID]) {
5395                 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5396
5397                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5398                                                   fillargs.netnsid);
5399                 if (IS_ERR(tgt_net))
5400                         return PTR_ERR(tgt_net);
5401         }
5402
5403         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5404         if (!addr)
5405                 return -EINVAL;
5406
5407         ifm = nlmsg_data(nlh);
5408         if (ifm->ifa_index)
5409                 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5410
5411         ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5412         if (!ifa) {
5413                 err = -EADDRNOTAVAIL;
5414                 goto errout;
5415         }
5416
5417         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5418         if (!skb) {
5419                 err = -ENOBUFS;
5420                 goto errout_ifa;
5421         }
5422
5423         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5424         if (err < 0) {
5425                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5426                 WARN_ON(err == -EMSGSIZE);
5427                 kfree_skb(skb);
5428                 goto errout_ifa;
5429         }
5430         err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5431 errout_ifa:
5432         in6_ifa_put(ifa);
5433 errout:
5434         dev_put(dev);
5435         if (fillargs.netnsid >= 0)
5436                 put_net(tgt_net);
5437
5438         return err;
5439 }
5440
5441 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5442 {
5443         struct sk_buff *skb;
5444         struct net *net = dev_net(ifa->idev->dev);
5445         struct inet6_fill_args fillargs = {
5446                 .portid = 0,
5447                 .seq = 0,
5448                 .event = event,
5449                 .flags = 0,
5450                 .netnsid = -1,
5451         };
5452         int err = -ENOBUFS;
5453
5454         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5455         if (!skb)
5456                 goto errout;
5457
5458         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5459         if (err < 0) {
5460                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5461                 WARN_ON(err == -EMSGSIZE);
5462                 kfree_skb(skb);
5463                 goto errout;
5464         }
5465         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5466         return;
5467 errout:
5468         if (err < 0)
5469                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5470 }
5471
5472 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5473                                 __s32 *array, int bytes)
5474 {
5475         BUG_ON(bytes < (DEVCONF_MAX * 4));
5476
5477         memset(array, 0, bytes);
5478         array[DEVCONF_FORWARDING] = cnf->forwarding;
5479         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5480         array[DEVCONF_MTU6] = cnf->mtu6;
5481         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5482         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5483         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5484         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5485         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5486         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5487                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5488         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5489                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5490         array[DEVCONF_RTR_SOLICIT_DELAY] =
5491                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5492         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5493         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5494                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5495         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5496                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5497         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5498         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5499         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5500         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5501         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5502         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5503         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5504         array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5505         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5506         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5507 #ifdef CONFIG_IPV6_ROUTER_PREF
5508         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5509         array[DEVCONF_RTR_PROBE_INTERVAL] =
5510                 jiffies_to_msecs(cnf->rtr_probe_interval);
5511 #ifdef CONFIG_IPV6_ROUTE_INFO
5512         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5513         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5514 #endif
5515 #endif
5516         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5517         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5518 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5519         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5520         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5521 #endif
5522 #ifdef CONFIG_IPV6_MROUTE
5523         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5524 #endif
5525         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5526         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5527         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5528         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5529         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5530         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5531         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5532         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5533         /* we omit DEVCONF_STABLE_SECRET for now */
5534         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5535         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5536         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5537         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5538         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5539 #ifdef CONFIG_IPV6_SEG6_HMAC
5540         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5541 #endif
5542         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5543         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5544         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5545         array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5546         array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5547         array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5548         array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5549         array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5550         array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
5551 }
5552
5553 static inline size_t inet6_ifla6_size(void)
5554 {
5555         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5556              + nla_total_size(sizeof(struct ifla_cacheinfo))
5557              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5558              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5559              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5560              + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5561              + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5562              + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5563              + 0;
5564 }
5565
5566 static inline size_t inet6_if_nlmsg_size(void)
5567 {
5568         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5569                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5570                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5571                + nla_total_size(4) /* IFLA_MTU */
5572                + nla_total_size(4) /* IFLA_LINK */
5573                + nla_total_size(1) /* IFLA_OPERSTATE */
5574                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5575 }
5576
5577 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5578                                         int bytes)
5579 {
5580         int i;
5581         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5582         BUG_ON(pad < 0);
5583
5584         /* Use put_unaligned() because stats may not be aligned for u64. */
5585         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5586         for (i = 1; i < ICMP6_MIB_MAX; i++)
5587                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5588
5589         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5590 }
5591
5592 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5593                                         int bytes, size_t syncpoff)
5594 {
5595         int i, c;
5596         u64 buff[IPSTATS_MIB_MAX];
5597         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5598
5599         BUG_ON(pad < 0);
5600
5601         memset(buff, 0, sizeof(buff));
5602         buff[0] = IPSTATS_MIB_MAX;
5603
5604         for_each_possible_cpu(c) {
5605                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5606                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5607         }
5608
5609         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5610         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5611 }
5612
5613 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5614                              int bytes)
5615 {
5616         switch (attrtype) {
5617         case IFLA_INET6_STATS:
5618                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5619                                      offsetof(struct ipstats_mib, syncp));
5620                 break;
5621         case IFLA_INET6_ICMP6STATS:
5622                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5623                 break;
5624         }
5625 }
5626
5627 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5628                                   u32 ext_filter_mask)
5629 {
5630         struct nlattr *nla;
5631         struct ifla_cacheinfo ci;
5632
5633         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5634                 goto nla_put_failure;
5635         ci.max_reasm_len = IPV6_MAXPLEN;
5636         ci.tstamp = cstamp_delta(idev->tstamp);
5637         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5638         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5639         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5640                 goto nla_put_failure;
5641         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5642         if (!nla)
5643                 goto nla_put_failure;
5644         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5645
5646         /* XXX - MC not implemented */
5647
5648         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5649                 return 0;
5650
5651         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5652         if (!nla)
5653                 goto nla_put_failure;
5654         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5655
5656         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5657         if (!nla)
5658                 goto nla_put_failure;
5659         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5660
5661         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5662         if (!nla)
5663                 goto nla_put_failure;
5664         read_lock_bh(&idev->lock);
5665         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5666         read_unlock_bh(&idev->lock);
5667
5668         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5669                 goto nla_put_failure;
5670
5671         if (idev->ra_mtu &&
5672             nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5673                 goto nla_put_failure;
5674
5675         return 0;
5676
5677 nla_put_failure:
5678         return -EMSGSIZE;
5679 }
5680
5681 static size_t inet6_get_link_af_size(const struct net_device *dev,
5682                                      u32 ext_filter_mask)
5683 {
5684         if (!__in6_dev_get(dev))
5685                 return 0;
5686
5687         return inet6_ifla6_size();
5688 }
5689
5690 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5691                               u32 ext_filter_mask)
5692 {
5693         struct inet6_dev *idev = __in6_dev_get(dev);
5694
5695         if (!idev)
5696                 return -ENODATA;
5697
5698         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5699                 return -EMSGSIZE;
5700
5701         return 0;
5702 }
5703
5704 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5705                              struct netlink_ext_ack *extack)
5706 {
5707         struct inet6_ifaddr *ifp;
5708         struct net_device *dev = idev->dev;
5709         bool clear_token, update_rs = false;
5710         struct in6_addr ll_addr;
5711
5712         ASSERT_RTNL();
5713
5714         if (!token)
5715                 return -EINVAL;
5716
5717         if (dev->flags & IFF_LOOPBACK) {
5718                 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5719                 return -EINVAL;
5720         }
5721
5722         if (dev->flags & IFF_NOARP) {
5723                 NL_SET_ERR_MSG_MOD(extack,
5724                                    "Device does not do neighbour discovery");
5725                 return -EINVAL;
5726         }
5727
5728         if (!ipv6_accept_ra(idev)) {
5729                 NL_SET_ERR_MSG_MOD(extack,
5730                                    "Router advertisement is disabled on device");
5731                 return -EINVAL;
5732         }
5733
5734         if (idev->cnf.rtr_solicits == 0) {
5735                 NL_SET_ERR_MSG(extack,
5736                                "Router solicitation is disabled on device");
5737                 return -EINVAL;
5738         }
5739
5740         write_lock_bh(&idev->lock);
5741
5742         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5743         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5744
5745         write_unlock_bh(&idev->lock);
5746
5747         clear_token = ipv6_addr_any(token);
5748         if (clear_token)
5749                 goto update_lft;
5750
5751         if (!idev->dead && (idev->if_flags & IF_READY) &&
5752             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5753                              IFA_F_OPTIMISTIC)) {
5754                 /* If we're not ready, then normal ifup will take care
5755                  * of this. Otherwise, we need to request our rs here.
5756                  */
5757                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5758                 update_rs = true;
5759         }
5760
5761 update_lft:
5762         write_lock_bh(&idev->lock);
5763
5764         if (update_rs) {
5765                 idev->if_flags |= IF_RS_SENT;
5766                 idev->rs_interval = rfc3315_s14_backoff_init(
5767                         idev->cnf.rtr_solicit_interval);
5768                 idev->rs_probes = 1;
5769                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5770         }
5771
5772         /* Well, that's kinda nasty ... */
5773         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5774                 spin_lock(&ifp->lock);
5775                 if (ifp->tokenized) {
5776                         ifp->valid_lft = 0;
5777                         ifp->prefered_lft = 0;
5778                 }
5779                 spin_unlock(&ifp->lock);
5780         }
5781
5782         write_unlock_bh(&idev->lock);
5783         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5784         addrconf_verify_rtnl();
5785         return 0;
5786 }
5787
5788 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5789         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5790         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5791         [IFLA_INET6_RA_MTU]             = { .type = NLA_REJECT,
5792                                             .reject_message =
5793                                                 "IFLA_INET6_RA_MTU can not be set" },
5794 };
5795
5796 static int check_addr_gen_mode(int mode)
5797 {
5798         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5799             mode != IN6_ADDR_GEN_MODE_NONE &&
5800             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5801             mode != IN6_ADDR_GEN_MODE_RANDOM)
5802                 return -EINVAL;
5803         return 1;
5804 }
5805
5806 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5807                                 int mode)
5808 {
5809         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5810             !idev->cnf.stable_secret.initialized &&
5811             !net->ipv6.devconf_dflt->stable_secret.initialized)
5812                 return -EINVAL;
5813         return 1;
5814 }
5815
5816 static int inet6_validate_link_af(const struct net_device *dev,
5817                                   const struct nlattr *nla,
5818                                   struct netlink_ext_ack *extack)
5819 {
5820         struct nlattr *tb[IFLA_INET6_MAX + 1];
5821         struct inet6_dev *idev = NULL;
5822         int err;
5823
5824         if (dev) {
5825                 idev = __in6_dev_get(dev);
5826                 if (!idev)
5827                         return -EAFNOSUPPORT;
5828         }
5829
5830         err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5831                                           inet6_af_policy, extack);
5832         if (err)
5833                 return err;
5834
5835         if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5836                 return -EINVAL;
5837
5838         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5839                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5840
5841                 if (check_addr_gen_mode(mode) < 0)
5842                         return -EINVAL;
5843                 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5844                         return -EINVAL;
5845         }
5846
5847         return 0;
5848 }
5849
5850 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5851                              struct netlink_ext_ack *extack)
5852 {
5853         struct inet6_dev *idev = __in6_dev_get(dev);
5854         struct nlattr *tb[IFLA_INET6_MAX + 1];
5855         int err;
5856
5857         if (!idev)
5858                 return -EAFNOSUPPORT;
5859
5860         if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5861                 return -EINVAL;
5862
5863         if (tb[IFLA_INET6_TOKEN]) {
5864                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5865                                         extack);
5866                 if (err)
5867                         return err;
5868         }
5869
5870         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5871                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5872
5873                 idev->cnf.addr_gen_mode = mode;
5874         }
5875
5876         return 0;
5877 }
5878
5879 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5880                              u32 portid, u32 seq, int event, unsigned int flags)
5881 {
5882         struct net_device *dev = idev->dev;
5883         struct ifinfomsg *hdr;
5884         struct nlmsghdr *nlh;
5885         void *protoinfo;
5886
5887         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5888         if (!nlh)
5889                 return -EMSGSIZE;
5890
5891         hdr = nlmsg_data(nlh);
5892         hdr->ifi_family = AF_INET6;
5893         hdr->__ifi_pad = 0;
5894         hdr->ifi_type = dev->type;
5895         hdr->ifi_index = dev->ifindex;
5896         hdr->ifi_flags = dev_get_flags(dev);
5897         hdr->ifi_change = 0;
5898
5899         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5900             (dev->addr_len &&
5901              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5902             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5903             (dev->ifindex != dev_get_iflink(dev) &&
5904              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5905             nla_put_u8(skb, IFLA_OPERSTATE,
5906                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5907                 goto nla_put_failure;
5908         protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5909         if (!protoinfo)
5910                 goto nla_put_failure;
5911
5912         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5913                 goto nla_put_failure;
5914
5915         nla_nest_end(skb, protoinfo);
5916         nlmsg_end(skb, nlh);
5917         return 0;
5918
5919 nla_put_failure:
5920         nlmsg_cancel(skb, nlh);
5921         return -EMSGSIZE;
5922 }
5923
5924 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5925                                    struct netlink_ext_ack *extack)
5926 {
5927         struct ifinfomsg *ifm;
5928
5929         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5930                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5931                 return -EINVAL;
5932         }
5933
5934         if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5935                 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5936                 return -EINVAL;
5937         }
5938
5939         ifm = nlmsg_data(nlh);
5940         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5941             ifm->ifi_change || ifm->ifi_index) {
5942                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5943                 return -EINVAL;
5944         }
5945
5946         return 0;
5947 }
5948
5949 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5950 {
5951         struct net *net = sock_net(skb->sk);
5952         int h, s_h;
5953         int idx = 0, s_idx;
5954         struct net_device *dev;
5955         struct inet6_dev *idev;
5956         struct hlist_head *head;
5957
5958         /* only requests using strict checking can pass data to
5959          * influence the dump
5960          */
5961         if (cb->strict_check) {
5962                 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5963
5964                 if (err < 0)
5965                         return err;
5966         }
5967
5968         s_h = cb->args[0];
5969         s_idx = cb->args[1];
5970
5971         rcu_read_lock();
5972         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5973                 idx = 0;
5974                 head = &net->dev_index_head[h];
5975                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5976                         if (idx < s_idx)
5977                                 goto cont;
5978                         idev = __in6_dev_get(dev);
5979                         if (!idev)
5980                                 goto cont;
5981                         if (inet6_fill_ifinfo(skb, idev,
5982                                               NETLINK_CB(cb->skb).portid,
5983                                               cb->nlh->nlmsg_seq,
5984                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5985                                 goto out;
5986 cont:
5987                         idx++;
5988                 }
5989         }
5990 out:
5991         rcu_read_unlock();
5992         cb->args[1] = idx;
5993         cb->args[0] = h;
5994
5995         return skb->len;
5996 }
5997
5998 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5999 {
6000         struct sk_buff *skb;
6001         struct net *net = dev_net(idev->dev);
6002         int err = -ENOBUFS;
6003
6004         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6005         if (!skb)
6006                 goto errout;
6007
6008         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6009         if (err < 0) {
6010                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6011                 WARN_ON(err == -EMSGSIZE);
6012                 kfree_skb(skb);
6013                 goto errout;
6014         }
6015         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6016         return;
6017 errout:
6018         if (err < 0)
6019                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6020 }
6021
6022 static inline size_t inet6_prefix_nlmsg_size(void)
6023 {
6024         return NLMSG_ALIGN(sizeof(struct prefixmsg))
6025                + nla_total_size(sizeof(struct in6_addr))
6026                + nla_total_size(sizeof(struct prefix_cacheinfo));
6027 }
6028
6029 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6030                              struct prefix_info *pinfo, u32 portid, u32 seq,
6031                              int event, unsigned int flags)
6032 {
6033         struct prefixmsg *pmsg;
6034         struct nlmsghdr *nlh;
6035         struct prefix_cacheinfo ci;
6036
6037         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6038         if (!nlh)
6039                 return -EMSGSIZE;
6040
6041         pmsg = nlmsg_data(nlh);
6042         pmsg->prefix_family = AF_INET6;
6043         pmsg->prefix_pad1 = 0;
6044         pmsg->prefix_pad2 = 0;
6045         pmsg->prefix_ifindex = idev->dev->ifindex;
6046         pmsg->prefix_len = pinfo->prefix_len;
6047         pmsg->prefix_type = pinfo->type;
6048         pmsg->prefix_pad3 = 0;
6049         pmsg->prefix_flags = 0;
6050         if (pinfo->onlink)
6051                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6052         if (pinfo->autoconf)
6053                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6054
6055         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6056                 goto nla_put_failure;
6057         ci.preferred_time = ntohl(pinfo->prefered);
6058         ci.valid_time = ntohl(pinfo->valid);
6059         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6060                 goto nla_put_failure;
6061         nlmsg_end(skb, nlh);
6062         return 0;
6063
6064 nla_put_failure:
6065         nlmsg_cancel(skb, nlh);
6066         return -EMSGSIZE;
6067 }
6068
6069 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6070                          struct prefix_info *pinfo)
6071 {
6072         struct sk_buff *skb;
6073         struct net *net = dev_net(idev->dev);
6074         int err = -ENOBUFS;
6075
6076         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6077         if (!skb)
6078                 goto errout;
6079
6080         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6081         if (err < 0) {
6082                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6083                 WARN_ON(err == -EMSGSIZE);
6084                 kfree_skb(skb);
6085                 goto errout;
6086         }
6087         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6088         return;
6089 errout:
6090         if (err < 0)
6091                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6092 }
6093
6094 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6095 {
6096         struct net *net = dev_net(ifp->idev->dev);
6097
6098         if (event)
6099                 ASSERT_RTNL();
6100
6101         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6102
6103         switch (event) {
6104         case RTM_NEWADDR:
6105                 /*
6106                  * If the address was optimistic we inserted the route at the
6107                  * start of our DAD process, so we don't need to do it again.
6108                  * If the device was taken down in the middle of the DAD
6109                  * cycle there is a race where we could get here without a
6110                  * host route, so nothing to insert. That will be fixed when
6111                  * the device is brought up.
6112                  */
6113                 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6114                         ip6_ins_rt(net, ifp->rt);
6115                 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6116                         pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6117                                 &ifp->addr, ifp->idev->dev->name);
6118                 }
6119
6120                 if (ifp->idev->cnf.forwarding)
6121                         addrconf_join_anycast(ifp);
6122                 if (!ipv6_addr_any(&ifp->peer_addr))
6123                         addrconf_prefix_route(&ifp->peer_addr, 128,
6124                                               ifp->rt_priority, ifp->idev->dev,
6125                                               0, 0, GFP_ATOMIC);
6126                 break;
6127         case RTM_DELADDR:
6128                 if (ifp->idev->cnf.forwarding)
6129                         addrconf_leave_anycast(ifp);
6130                 addrconf_leave_solict(ifp->idev, &ifp->addr);
6131                 if (!ipv6_addr_any(&ifp->peer_addr)) {
6132                         struct fib6_info *rt;
6133
6134                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6135                                                        ifp->idev->dev, 0, 0,
6136                                                        false);
6137                         if (rt)
6138                                 ip6_del_rt(net, rt, false);
6139                 }
6140                 if (ifp->rt) {
6141                         ip6_del_rt(net, ifp->rt, false);
6142                         ifp->rt = NULL;
6143                 }
6144                 rt_genid_bump_ipv6(net);
6145                 break;
6146         }
6147         atomic_inc(&net->ipv6.dev_addr_genid);
6148 }
6149
6150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6151 {
6152         if (likely(ifp->idev->dead == 0))
6153                 __ipv6_ifa_notify(event, ifp);
6154 }
6155
6156 #ifdef CONFIG_SYSCTL
6157
6158 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6159                 void *buffer, size_t *lenp, loff_t *ppos)
6160 {
6161         int *valp = ctl->data;
6162         int val = *valp;
6163         loff_t pos = *ppos;
6164         struct ctl_table lctl;
6165         int ret;
6166
6167         /*
6168          * ctl->data points to idev->cnf.forwarding, we should
6169          * not modify it until we get the rtnl lock.
6170          */
6171         lctl = *ctl;
6172         lctl.data = &val;
6173
6174         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6175
6176         if (write)
6177                 ret = addrconf_fixup_forwarding(ctl, valp, val);
6178         if (ret)
6179                 *ppos = pos;
6180         return ret;
6181 }
6182
6183 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6184                 void *buffer, size_t *lenp, loff_t *ppos)
6185 {
6186         struct inet6_dev *idev = ctl->extra1;
6187         int min_mtu = IPV6_MIN_MTU;
6188         struct ctl_table lctl;
6189
6190         lctl = *ctl;
6191         lctl.extra1 = &min_mtu;
6192         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6193
6194         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6195 }
6196
6197 static void dev_disable_change(struct inet6_dev *idev)
6198 {
6199         struct netdev_notifier_info info;
6200
6201         if (!idev || !idev->dev)
6202                 return;
6203
6204         netdev_notifier_info_init(&info, idev->dev);
6205         if (idev->cnf.disable_ipv6)
6206                 addrconf_notify(NULL, NETDEV_DOWN, &info);
6207         else
6208                 addrconf_notify(NULL, NETDEV_UP, &info);
6209 }
6210
6211 static void addrconf_disable_change(struct net *net, __s32 newf)
6212 {
6213         struct net_device *dev;
6214         struct inet6_dev *idev;
6215
6216         for_each_netdev(net, dev) {
6217                 idev = __in6_dev_get(dev);
6218                 if (idev) {
6219                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6220                         idev->cnf.disable_ipv6 = newf;
6221                         if (changed)
6222                                 dev_disable_change(idev);
6223                 }
6224         }
6225 }
6226
6227 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6228 {
6229         struct net *net;
6230         int old;
6231
6232         if (!rtnl_trylock())
6233                 return restart_syscall();
6234
6235         net = (struct net *)table->extra2;
6236         old = *p;
6237         *p = newf;
6238
6239         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6240                 rtnl_unlock();
6241                 return 0;
6242         }
6243
6244         if (p == &net->ipv6.devconf_all->disable_ipv6) {
6245                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6246                 addrconf_disable_change(net, newf);
6247         } else if ((!newf) ^ (!old))
6248                 dev_disable_change((struct inet6_dev *)table->extra1);
6249
6250         rtnl_unlock();
6251         return 0;
6252 }
6253
6254 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6255                 void *buffer, size_t *lenp, loff_t *ppos)
6256 {
6257         int *valp = ctl->data;
6258         int val = *valp;
6259         loff_t pos = *ppos;
6260         struct ctl_table lctl;
6261         int ret;
6262
6263         /*
6264          * ctl->data points to idev->cnf.disable_ipv6, we should
6265          * not modify it until we get the rtnl lock.
6266          */
6267         lctl = *ctl;
6268         lctl.data = &val;
6269
6270         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6271
6272         if (write)
6273                 ret = addrconf_disable_ipv6(ctl, valp, val);
6274         if (ret)
6275                 *ppos = pos;
6276         return ret;
6277 }
6278
6279 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6280                 void *buffer, size_t *lenp, loff_t *ppos)
6281 {
6282         int *valp = ctl->data;
6283         int ret;
6284         int old, new;
6285
6286         old = *valp;
6287         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6288         new = *valp;
6289
6290         if (write && old != new) {
6291                 struct net *net = ctl->extra2;
6292
6293                 if (!rtnl_trylock())
6294                         return restart_syscall();
6295
6296                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6297                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6298                                                      NETCONFA_PROXY_NEIGH,
6299                                                      NETCONFA_IFINDEX_DEFAULT,
6300                                                      net->ipv6.devconf_dflt);
6301                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6302                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6303                                                      NETCONFA_PROXY_NEIGH,
6304                                                      NETCONFA_IFINDEX_ALL,
6305                                                      net->ipv6.devconf_all);
6306                 else {
6307                         struct inet6_dev *idev = ctl->extra1;
6308
6309                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6310                                                      NETCONFA_PROXY_NEIGH,
6311                                                      idev->dev->ifindex,
6312                                                      &idev->cnf);
6313                 }
6314                 rtnl_unlock();
6315         }
6316
6317         return ret;
6318 }
6319
6320 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6321                                          void *buffer, size_t *lenp,
6322                                          loff_t *ppos)
6323 {
6324         int ret = 0;
6325         u32 new_val;
6326         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6327         struct net *net = (struct net *)ctl->extra2;
6328         struct ctl_table tmp = {
6329                 .data = &new_val,
6330                 .maxlen = sizeof(new_val),
6331                 .mode = ctl->mode,
6332         };
6333
6334         if (!rtnl_trylock())
6335                 return restart_syscall();
6336
6337         new_val = *((u32 *)ctl->data);
6338
6339         ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6340         if (ret != 0)
6341                 goto out;
6342
6343         if (write) {
6344                 if (check_addr_gen_mode(new_val) < 0) {
6345                         ret = -EINVAL;
6346                         goto out;
6347                 }
6348
6349                 if (idev) {
6350                         if (check_stable_privacy(idev, net, new_val) < 0) {
6351                                 ret = -EINVAL;
6352                                 goto out;
6353                         }
6354
6355                         if (idev->cnf.addr_gen_mode != new_val) {
6356                                 idev->cnf.addr_gen_mode = new_val;
6357                                 addrconf_dev_config(idev->dev);
6358                         }
6359                 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6360                         struct net_device *dev;
6361
6362                         net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6363                         for_each_netdev(net, dev) {
6364                                 idev = __in6_dev_get(dev);
6365                                 if (idev &&
6366                                     idev->cnf.addr_gen_mode != new_val) {
6367                                         idev->cnf.addr_gen_mode = new_val;
6368                                         addrconf_dev_config(idev->dev);
6369                                 }
6370                         }
6371                 }
6372
6373                 *((u32 *)ctl->data) = new_val;
6374         }
6375
6376 out:
6377         rtnl_unlock();
6378
6379         return ret;
6380 }
6381
6382 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6383                                          void *buffer, size_t *lenp,
6384                                          loff_t *ppos)
6385 {
6386         int err;
6387         struct in6_addr addr;
6388         char str[IPV6_MAX_STRLEN];
6389         struct ctl_table lctl = *ctl;
6390         struct net *net = ctl->extra2;
6391         struct ipv6_stable_secret *secret = ctl->data;
6392
6393         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6394                 return -EIO;
6395
6396         lctl.maxlen = IPV6_MAX_STRLEN;
6397         lctl.data = str;
6398
6399         if (!rtnl_trylock())
6400                 return restart_syscall();
6401
6402         if (!write && !secret->initialized) {
6403                 err = -EIO;
6404                 goto out;
6405         }
6406
6407         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6408         if (err >= sizeof(str)) {
6409                 err = -EIO;
6410                 goto out;
6411         }
6412
6413         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6414         if (err || !write)
6415                 goto out;
6416
6417         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6418                 err = -EIO;
6419                 goto out;
6420         }
6421
6422         secret->initialized = true;
6423         secret->secret = addr;
6424
6425         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6426                 struct net_device *dev;
6427
6428                 for_each_netdev(net, dev) {
6429                         struct inet6_dev *idev = __in6_dev_get(dev);
6430
6431                         if (idev) {
6432                                 idev->cnf.addr_gen_mode =
6433                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6434                         }
6435                 }
6436         } else {
6437                 struct inet6_dev *idev = ctl->extra1;
6438
6439                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6440         }
6441
6442 out:
6443         rtnl_unlock();
6444
6445         return err;
6446 }
6447
6448 static
6449 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6450                                                 int write, void *buffer,
6451                                                 size_t *lenp,
6452                                                 loff_t *ppos)
6453 {
6454         int *valp = ctl->data;
6455         int val = *valp;
6456         loff_t pos = *ppos;
6457         struct ctl_table lctl;
6458         int ret;
6459
6460         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6461          * we should not modify it until we get the rtnl lock.
6462          */
6463         lctl = *ctl;
6464         lctl.data = &val;
6465
6466         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6467
6468         if (write)
6469                 ret = addrconf_fixup_linkdown(ctl, valp, val);
6470         if (ret)
6471                 *ppos = pos;
6472         return ret;
6473 }
6474
6475 static
6476 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6477 {
6478         if (rt) {
6479                 if (action)
6480                         rt->dst.flags |= DST_NOPOLICY;
6481                 else
6482                         rt->dst.flags &= ~DST_NOPOLICY;
6483         }
6484 }
6485
6486 static
6487 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6488 {
6489         struct inet6_ifaddr *ifa;
6490
6491         read_lock_bh(&idev->lock);
6492         list_for_each_entry(ifa, &idev->addr_list, if_list) {
6493                 spin_lock(&ifa->lock);
6494                 if (ifa->rt) {
6495                         /* host routes only use builtin fib6_nh */
6496                         struct fib6_nh *nh = ifa->rt->fib6_nh;
6497                         int cpu;
6498
6499                         rcu_read_lock();
6500                         ifa->rt->dst_nopolicy = val ? true : false;
6501                         if (nh->rt6i_pcpu) {
6502                                 for_each_possible_cpu(cpu) {
6503                                         struct rt6_info **rtp;
6504
6505                                         rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6506                                         addrconf_set_nopolicy(*rtp, val);
6507                                 }
6508                         }
6509                         rcu_read_unlock();
6510                 }
6511                 spin_unlock(&ifa->lock);
6512         }
6513         read_unlock_bh(&idev->lock);
6514 }
6515
6516 static
6517 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6518 {
6519         struct inet6_dev *idev;
6520         struct net *net;
6521
6522         if (!rtnl_trylock())
6523                 return restart_syscall();
6524
6525         *valp = val;
6526
6527         net = (struct net *)ctl->extra2;
6528         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6529                 rtnl_unlock();
6530                 return 0;
6531         }
6532
6533         if (valp == &net->ipv6.devconf_all->disable_policy)  {
6534                 struct net_device *dev;
6535
6536                 for_each_netdev(net, dev) {
6537                         idev = __in6_dev_get(dev);
6538                         if (idev)
6539                                 addrconf_disable_policy_idev(idev, val);
6540                 }
6541         } else {
6542                 idev = (struct inet6_dev *)ctl->extra1;
6543                 addrconf_disable_policy_idev(idev, val);
6544         }
6545
6546         rtnl_unlock();
6547         return 0;
6548 }
6549
6550 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6551                                    void *buffer, size_t *lenp, loff_t *ppos)
6552 {
6553         int *valp = ctl->data;
6554         int val = *valp;
6555         loff_t pos = *ppos;
6556         struct ctl_table lctl;
6557         int ret;
6558
6559         lctl = *ctl;
6560         lctl.data = &val;
6561         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6562
6563         if (write && (*valp != val))
6564                 ret = addrconf_disable_policy(ctl, valp, val);
6565
6566         if (ret)
6567                 *ppos = pos;
6568
6569         return ret;
6570 }
6571
6572 static int minus_one = -1;
6573 static const int two_five_five = 255;
6574 static u32 ioam6_if_id_max = U16_MAX;
6575
6576 static const struct ctl_table addrconf_sysctl[] = {
6577         {
6578                 .procname       = "forwarding",
6579                 .data           = &ipv6_devconf.forwarding,
6580                 .maxlen         = sizeof(int),
6581                 .mode           = 0644,
6582                 .proc_handler   = addrconf_sysctl_forward,
6583         },
6584         {
6585                 .procname       = "hop_limit",
6586                 .data           = &ipv6_devconf.hop_limit,
6587                 .maxlen         = sizeof(int),
6588                 .mode           = 0644,
6589                 .proc_handler   = proc_dointvec_minmax,
6590                 .extra1         = (void *)SYSCTL_ONE,
6591                 .extra2         = (void *)&two_five_five,
6592         },
6593         {
6594                 .procname       = "mtu",
6595                 .data           = &ipv6_devconf.mtu6,
6596                 .maxlen         = sizeof(int),
6597                 .mode           = 0644,
6598                 .proc_handler   = addrconf_sysctl_mtu,
6599         },
6600         {
6601                 .procname       = "accept_ra",
6602                 .data           = &ipv6_devconf.accept_ra,
6603                 .maxlen         = sizeof(int),
6604                 .mode           = 0644,
6605                 .proc_handler   = proc_dointvec,
6606         },
6607         {
6608                 .procname       = "accept_redirects",
6609                 .data           = &ipv6_devconf.accept_redirects,
6610                 .maxlen         = sizeof(int),
6611                 .mode           = 0644,
6612                 .proc_handler   = proc_dointvec,
6613         },
6614         {
6615                 .procname       = "autoconf",
6616                 .data           = &ipv6_devconf.autoconf,
6617                 .maxlen         = sizeof(int),
6618                 .mode           = 0644,
6619                 .proc_handler   = proc_dointvec,
6620         },
6621         {
6622                 .procname       = "dad_transmits",
6623                 .data           = &ipv6_devconf.dad_transmits,
6624                 .maxlen         = sizeof(int),
6625                 .mode           = 0644,
6626                 .proc_handler   = proc_dointvec,
6627         },
6628         {
6629                 .procname       = "router_solicitations",
6630                 .data           = &ipv6_devconf.rtr_solicits,
6631                 .maxlen         = sizeof(int),
6632                 .mode           = 0644,
6633                 .proc_handler   = proc_dointvec_minmax,
6634                 .extra1         = &minus_one,
6635         },
6636         {
6637                 .procname       = "router_solicitation_interval",
6638                 .data           = &ipv6_devconf.rtr_solicit_interval,
6639                 .maxlen         = sizeof(int),
6640                 .mode           = 0644,
6641                 .proc_handler   = proc_dointvec_jiffies,
6642         },
6643         {
6644                 .procname       = "router_solicitation_max_interval",
6645                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6646                 .maxlen         = sizeof(int),
6647                 .mode           = 0644,
6648                 .proc_handler   = proc_dointvec_jiffies,
6649         },
6650         {
6651                 .procname       = "router_solicitation_delay",
6652                 .data           = &ipv6_devconf.rtr_solicit_delay,
6653                 .maxlen         = sizeof(int),
6654                 .mode           = 0644,
6655                 .proc_handler   = proc_dointvec_jiffies,
6656         },
6657         {
6658                 .procname       = "force_mld_version",
6659                 .data           = &ipv6_devconf.force_mld_version,
6660                 .maxlen         = sizeof(int),
6661                 .mode           = 0644,
6662                 .proc_handler   = proc_dointvec,
6663         },
6664         {
6665                 .procname       = "mldv1_unsolicited_report_interval",
6666                 .data           =
6667                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6668                 .maxlen         = sizeof(int),
6669                 .mode           = 0644,
6670                 .proc_handler   = proc_dointvec_ms_jiffies,
6671         },
6672         {
6673                 .procname       = "mldv2_unsolicited_report_interval",
6674                 .data           =
6675                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6676                 .maxlen         = sizeof(int),
6677                 .mode           = 0644,
6678                 .proc_handler   = proc_dointvec_ms_jiffies,
6679         },
6680         {
6681                 .procname       = "use_tempaddr",
6682                 .data           = &ipv6_devconf.use_tempaddr,
6683                 .maxlen         = sizeof(int),
6684                 .mode           = 0644,
6685                 .proc_handler   = proc_dointvec,
6686         },
6687         {
6688                 .procname       = "temp_valid_lft",
6689                 .data           = &ipv6_devconf.temp_valid_lft,
6690                 .maxlen         = sizeof(int),
6691                 .mode           = 0644,
6692                 .proc_handler   = proc_dointvec,
6693         },
6694         {
6695                 .procname       = "temp_prefered_lft",
6696                 .data           = &ipv6_devconf.temp_prefered_lft,
6697                 .maxlen         = sizeof(int),
6698                 .mode           = 0644,
6699                 .proc_handler   = proc_dointvec,
6700         },
6701         {
6702                 .procname       = "regen_max_retry",
6703                 .data           = &ipv6_devconf.regen_max_retry,
6704                 .maxlen         = sizeof(int),
6705                 .mode           = 0644,
6706                 .proc_handler   = proc_dointvec,
6707         },
6708         {
6709                 .procname       = "max_desync_factor",
6710                 .data           = &ipv6_devconf.max_desync_factor,
6711                 .maxlen         = sizeof(int),
6712                 .mode           = 0644,
6713                 .proc_handler   = proc_dointvec,
6714         },
6715         {
6716                 .procname       = "max_addresses",
6717                 .data           = &ipv6_devconf.max_addresses,
6718                 .maxlen         = sizeof(int),
6719                 .mode           = 0644,
6720                 .proc_handler   = proc_dointvec,
6721         },
6722         {
6723                 .procname       = "accept_ra_defrtr",
6724                 .data           = &ipv6_devconf.accept_ra_defrtr,
6725                 .maxlen         = sizeof(int),
6726                 .mode           = 0644,
6727                 .proc_handler   = proc_dointvec,
6728         },
6729         {
6730                 .procname       = "ra_defrtr_metric",
6731                 .data           = &ipv6_devconf.ra_defrtr_metric,
6732                 .maxlen         = sizeof(u32),
6733                 .mode           = 0644,
6734                 .proc_handler   = proc_douintvec_minmax,
6735                 .extra1         = (void *)SYSCTL_ONE,
6736         },
6737         {
6738                 .procname       = "accept_ra_min_hop_limit",
6739                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6740                 .maxlen         = sizeof(int),
6741                 .mode           = 0644,
6742                 .proc_handler   = proc_dointvec,
6743         },
6744         {
6745                 .procname       = "accept_ra_pinfo",
6746                 .data           = &ipv6_devconf.accept_ra_pinfo,
6747                 .maxlen         = sizeof(int),
6748                 .mode           = 0644,
6749                 .proc_handler   = proc_dointvec,
6750         },
6751 #ifdef CONFIG_IPV6_ROUTER_PREF
6752         {
6753                 .procname       = "accept_ra_rtr_pref",
6754                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6755                 .maxlen         = sizeof(int),
6756                 .mode           = 0644,
6757                 .proc_handler   = proc_dointvec,
6758         },
6759         {
6760                 .procname       = "router_probe_interval",
6761                 .data           = &ipv6_devconf.rtr_probe_interval,
6762                 .maxlen         = sizeof(int),
6763                 .mode           = 0644,
6764                 .proc_handler   = proc_dointvec_jiffies,
6765         },
6766 #ifdef CONFIG_IPV6_ROUTE_INFO
6767         {
6768                 .procname       = "accept_ra_rt_info_min_plen",
6769                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6770                 .maxlen         = sizeof(int),
6771                 .mode           = 0644,
6772                 .proc_handler   = proc_dointvec,
6773         },
6774         {
6775                 .procname       = "accept_ra_rt_info_max_plen",
6776                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6777                 .maxlen         = sizeof(int),
6778                 .mode           = 0644,
6779                 .proc_handler   = proc_dointvec,
6780         },
6781 #endif
6782 #endif
6783         {
6784                 .procname       = "proxy_ndp",
6785                 .data           = &ipv6_devconf.proxy_ndp,
6786                 .maxlen         = sizeof(int),
6787                 .mode           = 0644,
6788                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6789         },
6790         {
6791                 .procname       = "accept_source_route",
6792                 .data           = &ipv6_devconf.accept_source_route,
6793                 .maxlen         = sizeof(int),
6794                 .mode           = 0644,
6795                 .proc_handler   = proc_dointvec,
6796         },
6797 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6798         {
6799                 .procname       = "optimistic_dad",
6800                 .data           = &ipv6_devconf.optimistic_dad,
6801                 .maxlen         = sizeof(int),
6802                 .mode           = 0644,
6803                 .proc_handler   = proc_dointvec,
6804         },
6805         {
6806                 .procname       = "use_optimistic",
6807                 .data           = &ipv6_devconf.use_optimistic,
6808                 .maxlen         = sizeof(int),
6809                 .mode           = 0644,
6810                 .proc_handler   = proc_dointvec,
6811         },
6812 #endif
6813 #ifdef CONFIG_IPV6_MROUTE
6814         {
6815                 .procname       = "mc_forwarding",
6816                 .data           = &ipv6_devconf.mc_forwarding,
6817                 .maxlen         = sizeof(int),
6818                 .mode           = 0444,
6819                 .proc_handler   = proc_dointvec,
6820         },
6821 #endif
6822         {
6823                 .procname       = "disable_ipv6",
6824                 .data           = &ipv6_devconf.disable_ipv6,
6825                 .maxlen         = sizeof(int),
6826                 .mode           = 0644,
6827                 .proc_handler   = addrconf_sysctl_disable,
6828         },
6829         {
6830                 .procname       = "accept_dad",
6831                 .data           = &ipv6_devconf.accept_dad,
6832                 .maxlen         = sizeof(int),
6833                 .mode           = 0644,
6834                 .proc_handler   = proc_dointvec,
6835         },
6836         {
6837                 .procname       = "force_tllao",
6838                 .data           = &ipv6_devconf.force_tllao,
6839                 .maxlen         = sizeof(int),
6840                 .mode           = 0644,
6841                 .proc_handler   = proc_dointvec
6842         },
6843         {
6844                 .procname       = "ndisc_notify",
6845                 .data           = &ipv6_devconf.ndisc_notify,
6846                 .maxlen         = sizeof(int),
6847                 .mode           = 0644,
6848                 .proc_handler   = proc_dointvec
6849         },
6850         {
6851                 .procname       = "suppress_frag_ndisc",
6852                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6853                 .maxlen         = sizeof(int),
6854                 .mode           = 0644,
6855                 .proc_handler   = proc_dointvec
6856         },
6857         {
6858                 .procname       = "accept_ra_from_local",
6859                 .data           = &ipv6_devconf.accept_ra_from_local,
6860                 .maxlen         = sizeof(int),
6861                 .mode           = 0644,
6862                 .proc_handler   = proc_dointvec,
6863         },
6864         {
6865                 .procname       = "accept_ra_mtu",
6866                 .data           = &ipv6_devconf.accept_ra_mtu,
6867                 .maxlen         = sizeof(int),
6868                 .mode           = 0644,
6869                 .proc_handler   = proc_dointvec,
6870         },
6871         {
6872                 .procname       = "stable_secret",
6873                 .data           = &ipv6_devconf.stable_secret,
6874                 .maxlen         = IPV6_MAX_STRLEN,
6875                 .mode           = 0600,
6876                 .proc_handler   = addrconf_sysctl_stable_secret,
6877         },
6878         {
6879                 .procname       = "use_oif_addrs_only",
6880                 .data           = &ipv6_devconf.use_oif_addrs_only,
6881                 .maxlen         = sizeof(int),
6882                 .mode           = 0644,
6883                 .proc_handler   = proc_dointvec,
6884         },
6885         {
6886                 .procname       = "ignore_routes_with_linkdown",
6887                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6888                 .maxlen         = sizeof(int),
6889                 .mode           = 0644,
6890                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6891         },
6892         {
6893                 .procname       = "drop_unicast_in_l2_multicast",
6894                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6895                 .maxlen         = sizeof(int),
6896                 .mode           = 0644,
6897                 .proc_handler   = proc_dointvec,
6898         },
6899         {
6900                 .procname       = "drop_unsolicited_na",
6901                 .data           = &ipv6_devconf.drop_unsolicited_na,
6902                 .maxlen         = sizeof(int),
6903                 .mode           = 0644,
6904                 .proc_handler   = proc_dointvec,
6905         },
6906         {
6907                 .procname       = "keep_addr_on_down",
6908                 .data           = &ipv6_devconf.keep_addr_on_down,
6909                 .maxlen         = sizeof(int),
6910                 .mode           = 0644,
6911                 .proc_handler   = proc_dointvec,
6912
6913         },
6914         {
6915                 .procname       = "seg6_enabled",
6916                 .data           = &ipv6_devconf.seg6_enabled,
6917                 .maxlen         = sizeof(int),
6918                 .mode           = 0644,
6919                 .proc_handler   = proc_dointvec,
6920         },
6921 #ifdef CONFIG_IPV6_SEG6_HMAC
6922         {
6923                 .procname       = "seg6_require_hmac",
6924                 .data           = &ipv6_devconf.seg6_require_hmac,
6925                 .maxlen         = sizeof(int),
6926                 .mode           = 0644,
6927                 .proc_handler   = proc_dointvec,
6928         },
6929 #endif
6930         {
6931                 .procname       = "enhanced_dad",
6932                 .data           = &ipv6_devconf.enhanced_dad,
6933                 .maxlen         = sizeof(int),
6934                 .mode           = 0644,
6935                 .proc_handler   = proc_dointvec,
6936         },
6937         {
6938                 .procname       = "addr_gen_mode",
6939                 .data           = &ipv6_devconf.addr_gen_mode,
6940                 .maxlen         = sizeof(int),
6941                 .mode           = 0644,
6942                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6943         },
6944         {
6945                 .procname       = "disable_policy",
6946                 .data           = &ipv6_devconf.disable_policy,
6947                 .maxlen         = sizeof(int),
6948                 .mode           = 0644,
6949                 .proc_handler   = addrconf_sysctl_disable_policy,
6950         },
6951         {
6952                 .procname       = "ndisc_tclass",
6953                 .data           = &ipv6_devconf.ndisc_tclass,
6954                 .maxlen         = sizeof(int),
6955                 .mode           = 0644,
6956                 .proc_handler   = proc_dointvec_minmax,
6957                 .extra1         = (void *)SYSCTL_ZERO,
6958                 .extra2         = (void *)&two_five_five,
6959         },
6960         {
6961                 .procname       = "rpl_seg_enabled",
6962                 .data           = &ipv6_devconf.rpl_seg_enabled,
6963                 .maxlen         = sizeof(int),
6964                 .mode           = 0644,
6965                 .proc_handler   = proc_dointvec,
6966         },
6967         {
6968                 .procname       = "ioam6_enabled",
6969                 .data           = &ipv6_devconf.ioam6_enabled,
6970                 .maxlen         = sizeof(u8),
6971                 .mode           = 0644,
6972                 .proc_handler   = proc_dou8vec_minmax,
6973                 .extra1         = (void *)SYSCTL_ZERO,
6974                 .extra2         = (void *)SYSCTL_ONE,
6975         },
6976         {
6977                 .procname       = "ioam6_id",
6978                 .data           = &ipv6_devconf.ioam6_id,
6979                 .maxlen         = sizeof(u32),
6980                 .mode           = 0644,
6981                 .proc_handler   = proc_douintvec_minmax,
6982                 .extra1         = (void *)SYSCTL_ZERO,
6983                 .extra2         = (void *)&ioam6_if_id_max,
6984         },
6985         {
6986                 .procname       = "ioam6_id_wide",
6987                 .data           = &ipv6_devconf.ioam6_id_wide,
6988                 .maxlen         = sizeof(u32),
6989                 .mode           = 0644,
6990                 .proc_handler   = proc_douintvec,
6991         },
6992         {
6993                 .procname       = "ndisc_evict_nocarrier",
6994                 .data           = &ipv6_devconf.ndisc_evict_nocarrier,
6995                 .maxlen         = sizeof(u8),
6996                 .mode           = 0644,
6997                 .proc_handler   = proc_dou8vec_minmax,
6998                 .extra1         = (void *)SYSCTL_ZERO,
6999                 .extra2         = (void *)SYSCTL_ONE,
7000         },
7001         {
7002                 /* sentinel */
7003         }
7004 };
7005
7006 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7007                 struct inet6_dev *idev, struct ipv6_devconf *p)
7008 {
7009         int i, ifindex;
7010         struct ctl_table *table;
7011         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7012
7013         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
7014         if (!table)
7015                 goto out;
7016
7017         for (i = 0; table[i].data; i++) {
7018                 table[i].data += (char *)p - (char *)&ipv6_devconf;
7019                 /* If one of these is already set, then it is not safe to
7020                  * overwrite either of them: this makes proc_dointvec_minmax
7021                  * usable.
7022                  */
7023                 if (!table[i].extra1 && !table[i].extra2) {
7024                         table[i].extra1 = idev; /* embedded; no ref */
7025                         table[i].extra2 = net;
7026                 }
7027         }
7028
7029         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7030
7031         p->sysctl_header = register_net_sysctl(net, path, table);
7032         if (!p->sysctl_header)
7033                 goto free;
7034
7035         if (!strcmp(dev_name, "all"))
7036                 ifindex = NETCONFA_IFINDEX_ALL;
7037         else if (!strcmp(dev_name, "default"))
7038                 ifindex = NETCONFA_IFINDEX_DEFAULT;
7039         else
7040                 ifindex = idev->dev->ifindex;
7041         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7042                                      ifindex, p);
7043         return 0;
7044
7045 free:
7046         kfree(table);
7047 out:
7048         return -ENOBUFS;
7049 }
7050
7051 static void __addrconf_sysctl_unregister(struct net *net,
7052                                          struct ipv6_devconf *p, int ifindex)
7053 {
7054         struct ctl_table *table;
7055
7056         if (!p->sysctl_header)
7057                 return;
7058
7059         table = p->sysctl_header->ctl_table_arg;
7060         unregister_net_sysctl_table(p->sysctl_header);
7061         p->sysctl_header = NULL;
7062         kfree(table);
7063
7064         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7065 }
7066
7067 static int addrconf_sysctl_register(struct inet6_dev *idev)
7068 {
7069         int err;
7070
7071         if (!sysctl_dev_name_is_allowed(idev->dev->name))
7072                 return -EINVAL;
7073
7074         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7075                                     &ndisc_ifinfo_sysctl_change);
7076         if (err)
7077                 return err;
7078         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7079                                          idev, &idev->cnf);
7080         if (err)
7081                 neigh_sysctl_unregister(idev->nd_parms);
7082
7083         return err;
7084 }
7085
7086 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7087 {
7088         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7089                                      idev->dev->ifindex);
7090         neigh_sysctl_unregister(idev->nd_parms);
7091 }
7092
7093
7094 #endif
7095
7096 static int __net_init addrconf_init_net(struct net *net)
7097 {
7098         int err = -ENOMEM;
7099         struct ipv6_devconf *all, *dflt;
7100
7101         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7102         if (!all)
7103                 goto err_alloc_all;
7104
7105         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7106         if (!dflt)
7107                 goto err_alloc_dflt;
7108
7109         if (IS_ENABLED(CONFIG_SYSCTL) &&
7110             !net_eq(net, &init_net)) {
7111                 switch (sysctl_devconf_inherit_init_net) {
7112                 case 1:  /* copy from init_net */
7113                         memcpy(all, init_net.ipv6.devconf_all,
7114                                sizeof(ipv6_devconf));
7115                         memcpy(dflt, init_net.ipv6.devconf_dflt,
7116                                sizeof(ipv6_devconf_dflt));
7117                         break;
7118                 case 3: /* copy from the current netns */
7119                         memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7120                                sizeof(ipv6_devconf));
7121                         memcpy(dflt,
7122                                current->nsproxy->net_ns->ipv6.devconf_dflt,
7123                                sizeof(ipv6_devconf_dflt));
7124                         break;
7125                 case 0:
7126                 case 2:
7127                         /* use compiled values */
7128                         break;
7129                 }
7130         }
7131
7132         /* these will be inherited by all namespaces */
7133         dflt->autoconf = ipv6_defaults.autoconf;
7134         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7135
7136         dflt->stable_secret.initialized = false;
7137         all->stable_secret.initialized = false;
7138
7139         net->ipv6.devconf_all = all;
7140         net->ipv6.devconf_dflt = dflt;
7141
7142 #ifdef CONFIG_SYSCTL
7143         err = __addrconf_sysctl_register(net, "all", NULL, all);
7144         if (err < 0)
7145                 goto err_reg_all;
7146
7147         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7148         if (err < 0)
7149                 goto err_reg_dflt;
7150 #endif
7151         return 0;
7152
7153 #ifdef CONFIG_SYSCTL
7154 err_reg_dflt:
7155         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7156 err_reg_all:
7157         kfree(dflt);
7158 #endif
7159 err_alloc_dflt:
7160         kfree(all);
7161 err_alloc_all:
7162         return err;
7163 }
7164
7165 static void __net_exit addrconf_exit_net(struct net *net)
7166 {
7167 #ifdef CONFIG_SYSCTL
7168         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7169                                      NETCONFA_IFINDEX_DEFAULT);
7170         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7171                                      NETCONFA_IFINDEX_ALL);
7172 #endif
7173         kfree(net->ipv6.devconf_dflt);
7174         kfree(net->ipv6.devconf_all);
7175 }
7176
7177 static struct pernet_operations addrconf_ops = {
7178         .init = addrconf_init_net,
7179         .exit = addrconf_exit_net,
7180 };
7181
7182 static struct rtnl_af_ops inet6_ops __read_mostly = {
7183         .family           = AF_INET6,
7184         .fill_link_af     = inet6_fill_link_af,
7185         .get_link_af_size = inet6_get_link_af_size,
7186         .validate_link_af = inet6_validate_link_af,
7187         .set_link_af      = inet6_set_link_af,
7188 };
7189
7190 /*
7191  *      Init / cleanup code
7192  */
7193
7194 int __init addrconf_init(void)
7195 {
7196         struct inet6_dev *idev;
7197         int i, err;
7198
7199         err = ipv6_addr_label_init();
7200         if (err < 0) {
7201                 pr_crit("%s: cannot initialize default policy table: %d\n",
7202                         __func__, err);
7203                 goto out;
7204         }
7205
7206         err = register_pernet_subsys(&addrconf_ops);
7207         if (err < 0)
7208                 goto out_addrlabel;
7209
7210         addrconf_wq = create_workqueue("ipv6_addrconf");
7211         if (!addrconf_wq) {
7212                 err = -ENOMEM;
7213                 goto out_nowq;
7214         }
7215
7216         /* The addrconf netdev notifier requires that loopback_dev
7217          * has it's ipv6 private information allocated and setup
7218          * before it can bring up and give link-local addresses
7219          * to other devices which are up.
7220          *
7221          * Unfortunately, loopback_dev is not necessarily the first
7222          * entry in the global dev_base list of net devices.  In fact,
7223          * it is likely to be the very last entry on that list.
7224          * So this causes the notifier registry below to try and
7225          * give link-local addresses to all devices besides loopback_dev
7226          * first, then loopback_dev, which cases all the non-loopback_dev
7227          * devices to fail to get a link-local address.
7228          *
7229          * So, as a temporary fix, allocate the ipv6 structure for
7230          * loopback_dev first by hand.
7231          * Longer term, all of the dependencies ipv6 has upon the loopback
7232          * device and it being up should be removed.
7233          */
7234         rtnl_lock();
7235         idev = ipv6_add_dev(init_net.loopback_dev);
7236         rtnl_unlock();
7237         if (IS_ERR(idev)) {
7238                 err = PTR_ERR(idev);
7239                 goto errlo;
7240         }
7241
7242         ip6_route_init_special_entries();
7243
7244         for (i = 0; i < IN6_ADDR_HSIZE; i++)
7245                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7246
7247         register_netdevice_notifier(&ipv6_dev_notf);
7248
7249         addrconf_verify();
7250
7251         rtnl_af_register(&inet6_ops);
7252
7253         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7254                                    NULL, inet6_dump_ifinfo, 0);
7255         if (err < 0)
7256                 goto errout;
7257
7258         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7259                                    inet6_rtm_newaddr, NULL, 0);
7260         if (err < 0)
7261                 goto errout;
7262         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7263                                    inet6_rtm_deladdr, NULL, 0);
7264         if (err < 0)
7265                 goto errout;
7266         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7267                                    inet6_rtm_getaddr, inet6_dump_ifaddr,
7268                                    RTNL_FLAG_DOIT_UNLOCKED);
7269         if (err < 0)
7270                 goto errout;
7271         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7272                                    NULL, inet6_dump_ifmcaddr, 0);
7273         if (err < 0)
7274                 goto errout;
7275         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7276                                    NULL, inet6_dump_ifacaddr, 0);
7277         if (err < 0)
7278                 goto errout;
7279         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7280                                    inet6_netconf_get_devconf,
7281                                    inet6_netconf_dump_devconf,
7282                                    RTNL_FLAG_DOIT_UNLOCKED);
7283         if (err < 0)
7284                 goto errout;
7285         err = ipv6_addr_label_rtnl_register();
7286         if (err < 0)
7287                 goto errout;
7288
7289         return 0;
7290 errout:
7291         rtnl_unregister_all(PF_INET6);
7292         rtnl_af_unregister(&inet6_ops);
7293         unregister_netdevice_notifier(&ipv6_dev_notf);
7294 errlo:
7295         destroy_workqueue(addrconf_wq);
7296 out_nowq:
7297         unregister_pernet_subsys(&addrconf_ops);
7298 out_addrlabel:
7299         ipv6_addr_label_cleanup();
7300 out:
7301         return err;
7302 }
7303
7304 void addrconf_cleanup(void)
7305 {
7306         struct net_device *dev;
7307         int i;
7308
7309         unregister_netdevice_notifier(&ipv6_dev_notf);
7310         unregister_pernet_subsys(&addrconf_ops);
7311         ipv6_addr_label_cleanup();
7312
7313         rtnl_af_unregister(&inet6_ops);
7314
7315         rtnl_lock();
7316
7317         /* clean dev list */
7318         for_each_netdev(&init_net, dev) {
7319                 if (__in6_dev_get(dev) == NULL)
7320                         continue;
7321                 addrconf_ifdown(dev, true);
7322         }
7323         addrconf_ifdown(init_net.loopback_dev, true);
7324
7325         /*
7326          *      Check hash table.
7327          */
7328         spin_lock_bh(&addrconf_hash_lock);
7329         for (i = 0; i < IN6_ADDR_HSIZE; i++)
7330                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7331         spin_unlock_bh(&addrconf_hash_lock);
7332         cancel_delayed_work(&addr_chk_work);
7333         rtnl_unlock();
7334
7335         destroy_workqueue(addrconf_wq);
7336 }