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 static void addrconf_verify(struct net *net);
 151 static void addrconf_verify_rtnl(struct net *net);
 152
 153 static struct workqueue_struct *addrconf_wq;
 154
 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 157
 158 static void addrconf_type_change(struct net_device *dev,
 159                                  unsigned long event);
 160 static int addrconf_ifdown(struct net_device *dev, bool unregister);
 161
 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 163                                                   int plen,
 164                                                   const struct net_device *dev,
 165                                                   u32 flags, u32 noflags,
 166                                                   bool no_gw);
 167
 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 169 static void addrconf_dad_work(struct work_struct *w);
 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
 171                                    bool send_na);
 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
 173 static void addrconf_rs_timer(struct timer_list *t);
 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 176
 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 178                                 struct prefix_info *pinfo);
 179
 180 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 181         .forwarding             = 0,
 182         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 183         .mtu6                   = IPV6_MIN_MTU,
 184         .accept_ra              = 1,
 185         .accept_redirects       = 1,
 186         .autoconf               = 1,
 187         .force_mld_version      = 0,
 188         .mldv1_unsolicited_report_interval = 10 * HZ,
 189         .mldv2_unsolicited_report_interval = HZ,
 190         .dad_transmits          = 1,
 191         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 192         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 193         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 194         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 195         .use_tempaddr           = 0,
 196         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 197         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 198         .regen_max_retry        = REGEN_MAX_RETRY,
 199         .max_desync_factor      = MAX_DESYNC_FACTOR,
 200         .max_addresses          = IPV6_MAX_ADDRESSES,
 201         .accept_ra_defrtr       = 1,
 202         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 203         .accept_ra_from_local   = 0,
 204         .accept_ra_min_hop_limit= 1,
 205         .accept_ra_pinfo        = 1,
 206 #ifdef CONFIG_IPV6_ROUTER_PREF
 207         .accept_ra_rtr_pref     = 1,
 208         .rtr_probe_interval     = 60 * HZ,
 209 #ifdef CONFIG_IPV6_ROUTE_INFO
 210         .accept_ra_rt_info_min_plen = 0,
 211         .accept_ra_rt_info_max_plen = 0,
 212 #endif
 213 #endif
 214         .proxy_ndp              = 0,
 215         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 216         .disable_ipv6           = 0,
 217         .accept_dad             = 0,
 218         .suppress_frag_ndisc    = 1,
 219         .accept_ra_mtu          = 1,
 220         .stable_secret          = {
 221                 .initialized = false,
 222         },
 223         .use_oif_addrs_only     = 0,
 224         .ignore_routes_with_linkdown = 0,
 225         .keep_addr_on_down      = 0,
 226         .seg6_enabled           = 0,
 227 #ifdef CONFIG_IPV6_SEG6_HMAC
 228         .seg6_require_hmac      = 0,
 229 #endif
 230         .enhanced_dad           = 1,
 231         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 232         .disable_policy         = 0,
 233         .rpl_seg_enabled        = 0,
 234         .ioam6_enabled          = 0,
 235         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 236         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 237         .ndisc_evict_nocarrier  = 1,
 238 };
 239
 240 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 241         .forwarding             = 0,
 242         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 243         .mtu6                   = IPV6_MIN_MTU,
 244         .accept_ra              = 1,
 245         .accept_redirects       = 1,
 246         .autoconf               = 1,
 247         .force_mld_version      = 0,
 248         .mldv1_unsolicited_report_interval = 10 * HZ,
 249         .mldv2_unsolicited_report_interval = HZ,
 250         .dad_transmits          = 1,
 251         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 252         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 253         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 254         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 255         .use_tempaddr           = 0,
 256         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 257         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 258         .regen_max_retry        = REGEN_MAX_RETRY,
 259         .max_desync_factor      = MAX_DESYNC_FACTOR,
 260         .max_addresses          = IPV6_MAX_ADDRESSES,
 261         .accept_ra_defrtr       = 1,
 262         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 263         .accept_ra_from_local   = 0,
 264         .accept_ra_min_hop_limit= 1,
 265         .accept_ra_pinfo        = 1,
 266 #ifdef CONFIG_IPV6_ROUTER_PREF
 267         .accept_ra_rtr_pref     = 1,
 268         .rtr_probe_interval     = 60 * HZ,
 269 #ifdef CONFIG_IPV6_ROUTE_INFO
 270         .accept_ra_rt_info_min_plen = 0,
 271         .accept_ra_rt_info_max_plen = 0,
 272 #endif
 273 #endif
 274         .proxy_ndp              = 0,
 275         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 276         .disable_ipv6           = 0,
 277         .accept_dad             = 1,
 278         .suppress_frag_ndisc    = 1,
 279         .accept_ra_mtu          = 1,
 280         .stable_secret          = {
 281                 .initialized = false,
 282         },
 283         .use_oif_addrs_only     = 0,
 284         .ignore_routes_with_linkdown = 0,
 285         .keep_addr_on_down      = 0,
 286         .seg6_enabled           = 0,
 287 #ifdef CONFIG_IPV6_SEG6_HMAC
 288         .seg6_require_hmac      = 0,
 289 #endif
 290         .enhanced_dad           = 1,
 291         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 292         .disable_policy         = 0,
 293         .rpl_seg_enabled        = 0,
 294         .ioam6_enabled          = 0,
 295         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 296         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 297         .ndisc_evict_nocarrier  = 1,
 298 };
 299
 300 /* Check if link is ready: is it up and is a valid qdisc available */
 301 static inline bool addrconf_link_ready(const struct net_device *dev)
 302 {
 303         return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
 304 }
 305
 306 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 307 {
 308         if (del_timer(&idev->rs_timer))
 309                 __in6_dev_put(idev);
 310 }
 311
 312 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 313 {
 314         if (cancel_delayed_work(&ifp->dad_work))
 315                 __in6_ifa_put(ifp);
 316 }
 317
 318 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 319                                   unsigned long when)
 320 {
 321         if (!timer_pending(&idev->rs_timer))
 322                 in6_dev_hold(idev);
 323         mod_timer(&idev->rs_timer, jiffies + when);
 324 }
 325
 326 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 327                                    unsigned long delay)
 328 {
 329         in6_ifa_hold(ifp);
 330         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 331                 in6_ifa_put(ifp);
 332 }
 333
 334 static int snmp6_alloc_dev(struct inet6_dev *idev)
 335 {
 336         int i;
 337
 338         idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
 339         if (!idev->stats.ipv6)
 340                 goto err_ip;
 341
 342         for_each_possible_cpu(i) {
 343                 struct ipstats_mib *addrconf_stats;
 344                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 345                 u64_stats_init(&addrconf_stats->syncp);
 346         }
 347
 348
 349         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 350                                         GFP_KERNEL);
 351         if (!idev->stats.icmpv6dev)
 352                 goto err_icmp;
 353         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 354                                            GFP_KERNEL_ACCOUNT);
 355         if (!idev->stats.icmpv6msgdev)
 356                 goto err_icmpmsg;
 357
 358         return 0;
 359
 360 err_icmpmsg:
 361         kfree(idev->stats.icmpv6dev);
 362 err_icmp:
 363         free_percpu(idev->stats.ipv6);
 364 err_ip:
 365         return -ENOMEM;
 366 }
 367
 368 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 369 {
 370         struct inet6_dev *ndev;
 371         int err = -ENOMEM;
 372
 373         ASSERT_RTNL();
 374
 375         if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
 376                 return ERR_PTR(-EINVAL);
 377
 378         ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
 379         if (!ndev)
 380                 return ERR_PTR(err);
 381
 382         rwlock_init(&ndev->lock);
 383         ndev->dev = dev;
 384         INIT_LIST_HEAD(&ndev->addr_list);
 385         timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
 386         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 387
 388         if (ndev->cnf.stable_secret.initialized)
 389                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 390
 391         ndev->cnf.mtu6 = dev->mtu;
 392         ndev->ra_mtu = 0;
 393         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 394         if (!ndev->nd_parms) {
 395                 kfree(ndev);
 396                 return ERR_PTR(err);
 397         }
 398         if (ndev->cnf.forwarding)
 399                 dev_disable_lro(dev);
 400         /* We refer to the device */
 401         dev_hold_track(dev, &ndev->dev_tracker, GFP_KERNEL);
 402
 403         if (snmp6_alloc_dev(ndev) < 0) {
 404                 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
 405                            __func__);
 406                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 407                 dev_put_track(dev, &ndev->dev_tracker);
 408                 kfree(ndev);
 409                 return ERR_PTR(err);
 410         }
 411
 412         if (dev != blackhole_netdev) {
 413                 if (snmp6_register_dev(ndev) < 0) {
 414                         netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
 415                                    __func__, dev->name);
 416                         goto err_release;
 417                 }
 418         }
 419         /* One reference from device. */
 420         refcount_set(&ndev->refcnt, 1);
 421
 422         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 423                 ndev->cnf.accept_dad = -1;
 424
 425 #if IS_ENABLED(CONFIG_IPV6_SIT)
 426         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 427                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 428                 ndev->cnf.rtr_solicits = 0;
 429         }
 430 #endif
 431
 432         INIT_LIST_HEAD(&ndev->tempaddr_list);
 433         ndev->desync_factor = U32_MAX;
 434         if ((dev->flags&IFF_LOOPBACK) ||
 435             dev->type == ARPHRD_TUNNEL ||
 436             dev->type == ARPHRD_TUNNEL6 ||
 437             dev->type == ARPHRD_SIT ||
 438             dev->type == ARPHRD_NONE) {
 439                 ndev->cnf.use_tempaddr = -1;
 440         }
 441
 442         ndev->token = in6addr_any;
 443
 444         if (netif_running(dev) && addrconf_link_ready(dev))
 445                 ndev->if_flags |= IF_READY;
 446
 447         ipv6_mc_init_dev(ndev);
 448         ndev->tstamp = jiffies;
 449         if (dev != blackhole_netdev) {
 450                 err = addrconf_sysctl_register(ndev);
 451                 if (err) {
 452                         ipv6_mc_destroy_dev(ndev);
 453                         snmp6_unregister_dev(ndev);
 454                         goto err_release;
 455                 }
 456         }
 457         /* protected by rtnl_lock */
 458         rcu_assign_pointer(dev->ip6_ptr, ndev);
 459
 460         if (dev != blackhole_netdev) {
 461                 /* Join interface-local all-node multicast group */
 462                 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 463
 464                 /* Join all-node multicast group */
 465                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 466
 467                 /* Join all-router multicast group if forwarding is set */
 468                 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 469                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 470         }
 471         return ndev;
 472
 473 err_release:
 474         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 475         ndev->dead = 1;
 476         in6_dev_finish_destroy(ndev);
 477         return ERR_PTR(err);
 478 }
 479
 480 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 481 {
 482         struct inet6_dev *idev;
 483
 484         ASSERT_RTNL();
 485
 486         idev = __in6_dev_get(dev);
 487         if (!idev) {
 488                 idev = ipv6_add_dev(dev);
 489                 if (IS_ERR(idev))
 490                         return idev;
 491         }
 492
 493         if (dev->flags&IFF_UP)
 494                 ipv6_mc_up(idev);
 495         return idev;
 496 }
 497
 498 static int inet6_netconf_msgsize_devconf(int type)
 499 {
 500         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 501                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 502         bool all = false;
 503
 504         if (type == NETCONFA_ALL)
 505                 all = true;
 506
 507         if (all || type == NETCONFA_FORWARDING)
 508                 size += nla_total_size(4);
 509 #ifdef CONFIG_IPV6_MROUTE
 510         if (all || type == NETCONFA_MC_FORWARDING)
 511                 size += nla_total_size(4);
 512 #endif
 513         if (all || type == NETCONFA_PROXY_NEIGH)
 514                 size += nla_total_size(4);
 515
 516         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 517                 size += nla_total_size(4);
 518
 519         return size;
 520 }
 521
 522 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 523                                       struct ipv6_devconf *devconf, u32 portid,
 524                                       u32 seq, int event, unsigned int flags,
 525                                       int type)
 526 {
 527         struct nlmsghdr  *nlh;
 528         struct netconfmsg *ncm;
 529         bool all = false;
 530
 531         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 532                         flags);
 533         if (!nlh)
 534                 return -EMSGSIZE;
 535
 536         if (type == NETCONFA_ALL)
 537                 all = true;
 538
 539         ncm = nlmsg_data(nlh);
 540         ncm->ncm_family = AF_INET6;
 541
 542         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 543                 goto nla_put_failure;
 544
 545         if (!devconf)
 546                 goto out;
 547
 548         if ((all || type == NETCONFA_FORWARDING) &&
 549             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 550                 goto nla_put_failure;
 551 #ifdef CONFIG_IPV6_MROUTE
 552         if ((all || type == NETCONFA_MC_FORWARDING) &&
 553             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 554                         atomic_read(&devconf->mc_forwarding)) < 0)
 555                 goto nla_put_failure;
 556 #endif
 557         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 558             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 559                 goto nla_put_failure;
 560
 561         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 562             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 563                         devconf->ignore_routes_with_linkdown) < 0)
 564                 goto nla_put_failure;
 565
 566 out:
 567         nlmsg_end(skb, nlh);
 568         return 0;
 569
 570 nla_put_failure:
 571         nlmsg_cancel(skb, nlh);
 572         return -EMSGSIZE;
 573 }
 574
 575 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 576                                   int ifindex, struct ipv6_devconf *devconf)
 577 {
 578         struct sk_buff *skb;
 579         int err = -ENOBUFS;
 580
 581         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 582         if (!skb)
 583                 goto errout;
 584
 585         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 586                                          event, 0, type);
 587         if (err < 0) {
 588                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 589                 WARN_ON(err == -EMSGSIZE);
 590                 kfree_skb(skb);
 591                 goto errout;
 592         }
 593         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 594         return;
 595 errout:
 596         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 597 }
 598
 599 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 600         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 601         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 602         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 603         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 604 };
 605
 606 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
 607                                        const struct nlmsghdr *nlh,
 608                                        struct nlattr **tb,
 609                                        struct netlink_ext_ack *extack)
 610 {
 611         int i, err;
 612
 613         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
 614                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
 615                 return -EINVAL;
 616         }
 617
 618         if (!netlink_strict_get_check(skb))
 619                 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
 620                                               tb, NETCONFA_MAX,
 621                                               devconf_ipv6_policy, extack);
 622
 623         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
 624                                             tb, NETCONFA_MAX,
 625                                             devconf_ipv6_policy, extack);
 626         if (err)
 627                 return err;
 628
 629         for (i = 0; i <= NETCONFA_MAX; i++) {
 630                 if (!tb[i])
 631                         continue;
 632
 633                 switch (i) {
 634                 case NETCONFA_IFINDEX:
 635                         break;
 636                 default:
 637                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
 638                         return -EINVAL;
 639                 }
 640         }
 641
 642         return 0;
 643 }
 644
 645 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 646                                      struct nlmsghdr *nlh,
 647                                      struct netlink_ext_ack *extack)
 648 {
 649         struct net *net = sock_net(in_skb->sk);
 650         struct nlattr *tb[NETCONFA_MAX+1];
 651         struct inet6_dev *in6_dev = NULL;
 652         struct net_device *dev = NULL;
 653         struct sk_buff *skb;
 654         struct ipv6_devconf *devconf;
 655         int ifindex;
 656         int err;
 657
 658         err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
 659         if (err < 0)
 660                 return err;
 661
 662         if (!tb[NETCONFA_IFINDEX])
 663                 return -EINVAL;
 664
 665         err = -EINVAL;
 666         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 667         switch (ifindex) {
 668         case NETCONFA_IFINDEX_ALL:
 669                 devconf = net->ipv6.devconf_all;
 670                 break;
 671         case NETCONFA_IFINDEX_DEFAULT:
 672                 devconf = net->ipv6.devconf_dflt;
 673                 break;
 674         default:
 675                 dev = dev_get_by_index(net, ifindex);
 676                 if (!dev)
 677                         return -EINVAL;
 678                 in6_dev = in6_dev_get(dev);
 679                 if (!in6_dev)
 680                         goto errout;
 681                 devconf = &in6_dev->cnf;
 682                 break;
 683         }
 684
 685         err = -ENOBUFS;
 686         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
 687         if (!skb)
 688                 goto errout;
 689
 690         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 691                                          NETLINK_CB(in_skb).portid,
 692                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 693                                          NETCONFA_ALL);
 694         if (err < 0) {
 695                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 696                 WARN_ON(err == -EMSGSIZE);
 697                 kfree_skb(skb);
 698                 goto errout;
 699         }
 700         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 701 errout:
 702         if (in6_dev)
 703                 in6_dev_put(in6_dev);
 704         dev_put(dev);
 705         return err;
 706 }
 707
 708 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 709                                       struct netlink_callback *cb)
 710 {
 711         const struct nlmsghdr *nlh = cb->nlh;
 712         struct net *net = sock_net(skb->sk);
 713         int h, s_h;
 714         int idx, s_idx;
 715         struct net_device *dev;
 716         struct inet6_dev *idev;
 717         struct hlist_head *head;
 718
 719         if (cb->strict_check) {
 720                 struct netlink_ext_ack *extack = cb->extack;
 721                 struct netconfmsg *ncm;
 722
 723                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
 724                         NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
 725                         return -EINVAL;
 726                 }
 727
 728                 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
 729                         NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
 730                         return -EINVAL;
 731                 }
 732         }
 733
 734         s_h = cb->args[0];
 735         s_idx = idx = cb->args[1];
 736
 737         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 738                 idx = 0;
 739                 head = &net->dev_index_head[h];
 740                 rcu_read_lock();
 741                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 742                           net->dev_base_seq;
 743                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 744                         if (idx < s_idx)
 745                                 goto cont;
 746                         idev = __in6_dev_get(dev);
 747                         if (!idev)
 748                                 goto cont;
 749
 750                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 751                                                        &idev->cnf,
 752                                                        NETLINK_CB(cb->skb).portid,
 753                                                        nlh->nlmsg_seq,
 754                                                        RTM_NEWNETCONF,
 755                                                        NLM_F_MULTI,
 756                                                        NETCONFA_ALL) < 0) {
 757                                 rcu_read_unlock();
 758                                 goto done;
 759                         }
 760                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 761 cont:
 762                         idx++;
 763                 }
 764                 rcu_read_unlock();
 765         }
 766         if (h == NETDEV_HASHENTRIES) {
 767                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 768                                                net->ipv6.devconf_all,
 769                                                NETLINK_CB(cb->skb).portid,
 770                                                nlh->nlmsg_seq,
 771                                                RTM_NEWNETCONF, NLM_F_MULTI,
 772                                                NETCONFA_ALL) < 0)
 773                         goto done;
 774                 else
 775                         h++;
 776         }
 777         if (h == NETDEV_HASHENTRIES + 1) {
 778                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 779                                                net->ipv6.devconf_dflt,
 780                                                NETLINK_CB(cb->skb).portid,
 781                                                nlh->nlmsg_seq,
 782                                                RTM_NEWNETCONF, NLM_F_MULTI,
 783                                                NETCONFA_ALL) < 0)
 784                         goto done;
 785                 else
 786                         h++;
 787         }
 788 done:
 789         cb->args[0] = h;
 790         cb->args[1] = idx;
 791
 792         return skb->len;
 793 }
 794
 795 #ifdef CONFIG_SYSCTL
 796 static void dev_forward_change(struct inet6_dev *idev)
 797 {
 798         struct net_device *dev;
 799         struct inet6_ifaddr *ifa;
 800         LIST_HEAD(tmp_addr_list);
 801
 802         if (!idev)
 803                 return;
 804         dev = idev->dev;
 805         if (idev->cnf.forwarding)
 806                 dev_disable_lro(dev);
 807         if (dev->flags & IFF_MULTICAST) {
 808                 if (idev->cnf.forwarding) {
 809                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 810                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 811                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 812                 } else {
 813                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 814                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 815                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 816                 }
 817         }
 818
 819         read_lock_bh(&idev->lock);
 820         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 821                 if (ifa->flags&IFA_F_TENTATIVE)
 822                         continue;
 823                 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
 824         }
 825         read_unlock_bh(&idev->lock);
 826
 827         while (!list_empty(&tmp_addr_list)) {
 828                 ifa = list_first_entry(&tmp_addr_list,
 829                                        struct inet6_ifaddr, if_list_aux);
 830                 list_del(&ifa->if_list_aux);
 831                 if (idev->cnf.forwarding)
 832                         addrconf_join_anycast(ifa);
 833                 else
 834                         addrconf_leave_anycast(ifa);
 835         }
 836
 837         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 838                                      NETCONFA_FORWARDING,
 839                                      dev->ifindex, &idev->cnf);
 840 }
 841
 842
 843 static void addrconf_forward_change(struct net *net, __s32 newf)
 844 {
 845         struct net_device *dev;
 846         struct inet6_dev *idev;
 847
 848         for_each_netdev(net, dev) {
 849                 idev = __in6_dev_get(dev);
 850                 if (idev) {
 851                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 852                         idev->cnf.forwarding = newf;
 853                         if (changed)
 854                                 dev_forward_change(idev);
 855                 }
 856         }
 857 }
 858
 859 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 860 {
 861         struct net *net;
 862         int old;
 863
 864         if (!rtnl_trylock())
 865                 return restart_syscall();
 866
 867         net = (struct net *)table->extra2;
 868         old = *p;
 869         *p = newf;
 870
 871         if (p == &net->ipv6.devconf_dflt->forwarding) {
 872                 if ((!newf) ^ (!old))
 873                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 874                                                      NETCONFA_FORWARDING,
 875                                                      NETCONFA_IFINDEX_DEFAULT,
 876                                                      net->ipv6.devconf_dflt);
 877                 rtnl_unlock();
 878                 return 0;
 879         }
 880
 881         if (p == &net->ipv6.devconf_all->forwarding) {
 882                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 883
 884                 net->ipv6.devconf_dflt->forwarding = newf;
 885                 if ((!newf) ^ (!old_dflt))
 886                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 887                                                      NETCONFA_FORWARDING,
 888                                                      NETCONFA_IFINDEX_DEFAULT,
 889                                                      net->ipv6.devconf_dflt);
 890
 891                 addrconf_forward_change(net, newf);
 892                 if ((!newf) ^ (!old))
 893                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 894                                                      NETCONFA_FORWARDING,
 895                                                      NETCONFA_IFINDEX_ALL,
 896                                                      net->ipv6.devconf_all);
 897         } else if ((!newf) ^ (!old))
 898                 dev_forward_change((struct inet6_dev *)table->extra1);
 899         rtnl_unlock();
 900
 901         if (newf)
 902                 rt6_purge_dflt_routers(net);
 903         return 1;
 904 }
 905
 906 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 907 {
 908         struct net_device *dev;
 909         struct inet6_dev *idev;
 910
 911         for_each_netdev(net, dev) {
 912                 idev = __in6_dev_get(dev);
 913                 if (idev) {
 914                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 915
 916                         idev->cnf.ignore_routes_with_linkdown = newf;
 917                         if (changed)
 918                                 inet6_netconf_notify_devconf(dev_net(dev),
 919                                                              RTM_NEWNETCONF,
 920                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 921                                                              dev->ifindex,
 922                                                              &idev->cnf);
 923                 }
 924         }
 925 }
 926
 927 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 928 {
 929         struct net *net;
 930         int old;
 931
 932         if (!rtnl_trylock())
 933                 return restart_syscall();
 934
 935         net = (struct net *)table->extra2;
 936         old = *p;
 937         *p = newf;
 938
 939         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 940                 if ((!newf) ^ (!old))
 941                         inet6_netconf_notify_devconf(net,
 942                                                      RTM_NEWNETCONF,
 943                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 944                                                      NETCONFA_IFINDEX_DEFAULT,
 945                                                      net->ipv6.devconf_dflt);
 946                 rtnl_unlock();
 947                 return 0;
 948         }
 949
 950         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 951                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 952                 addrconf_linkdown_change(net, newf);
 953                 if ((!newf) ^ (!old))
 954                         inet6_netconf_notify_devconf(net,
 955                                                      RTM_NEWNETCONF,
 956                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 957                                                      NETCONFA_IFINDEX_ALL,
 958                                                      net->ipv6.devconf_all);
 959         }
 960         rtnl_unlock();
 961
 962         return 1;
 963 }
 964
 965 #endif
 966
 967 /* Nobody refers to this ifaddr, destroy it */
 968 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 969 {
 970         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 971
 972 #ifdef NET_REFCNT_DEBUG
 973         pr_debug("%s\n", __func__);
 974 #endif
 975
 976         in6_dev_put(ifp->idev);
 977
 978         if (cancel_delayed_work(&ifp->dad_work))
 979                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 980                           ifp);
 981
 982         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 983                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 984                 return;
 985         }
 986
 987         kfree_rcu(ifp, rcu);
 988 }
 989
 990 static void
 991 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 992 {
 993         struct list_head *p;
 994         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 995
 996         /*
 997          * Each device address list is sorted in order of scope -
 998          * global before linklocal.
 999          */
1000         list_for_each(p, &idev->addr_list) {
1001                 struct inet6_ifaddr *ifa
1002                         = list_entry(p, struct inet6_ifaddr, if_list);
1003                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1004                         break;
1005         }
1006
1007         list_add_tail_rcu(&ifp->if_list, p);
1008 }
1009
1010 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1011 {
1012         u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1013
1014         return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1015 }
1016
1017 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1018                                struct net_device *dev, unsigned int hash)
1019 {
1020         struct inet6_ifaddr *ifp;
1021
1022         hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1023                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1024                         if (!dev || ifp->idev->dev == dev)
1025                                 return true;
1026                 }
1027         }
1028         return false;
1029 }
1030
1031 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1032 {
1033         struct net *net = dev_net(dev);
1034         unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1035         int err = 0;
1036
1037         spin_lock(&net->ipv6.addrconf_hash_lock);
1038
1039         /* Ignore adding duplicate addresses on an interface */
1040         if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1041                 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1042                 err = -EEXIST;
1043         } else {
1044                 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1045         }
1046
1047         spin_unlock(&net->ipv6.addrconf_hash_lock);
1048
1049         return err;
1050 }
1051
1052 /* On success it returns ifp with increased reference count */
1053
1054 static struct inet6_ifaddr *
1055 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1056               bool can_block, struct netlink_ext_ack *extack)
1057 {
1058         gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1059         int addr_type = ipv6_addr_type(cfg->pfx);
1060         struct net *net = dev_net(idev->dev);
1061         struct inet6_ifaddr *ifa = NULL;
1062         struct fib6_info *f6i = NULL;
1063         int err = 0;
1064
1065         if (addr_type == IPV6_ADDR_ANY ||
1066             (addr_type & IPV6_ADDR_MULTICAST &&
1067              !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1068             (!(idev->dev->flags & IFF_LOOPBACK) &&
1069              !netif_is_l3_master(idev->dev) &&
1070              addr_type & IPV6_ADDR_LOOPBACK))
1071                 return ERR_PTR(-EADDRNOTAVAIL);
1072
1073         if (idev->dead) {
1074                 err = -ENODEV;                  /*XXX*/
1075                 goto out;
1076         }
1077
1078         if (idev->cnf.disable_ipv6) {
1079                 err = -EACCES;
1080                 goto out;
1081         }
1082
1083         /* validator notifier needs to be blocking;
1084          * do not call in atomic context
1085          */
1086         if (can_block) {
1087                 struct in6_validator_info i6vi = {
1088                         .i6vi_addr = *cfg->pfx,
1089                         .i6vi_dev = idev,
1090                         .extack = extack,
1091                 };
1092
1093                 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1094                 err = notifier_to_errno(err);
1095                 if (err < 0)
1096                         goto out;
1097         }
1098
1099         ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1100         if (!ifa) {
1101                 err = -ENOBUFS;
1102                 goto out;
1103         }
1104
1105         f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1106         if (IS_ERR(f6i)) {
1107                 err = PTR_ERR(f6i);
1108                 f6i = NULL;
1109                 goto out;
1110         }
1111
1112         neigh_parms_data_state_setall(idev->nd_parms);
1113
1114         ifa->addr = *cfg->pfx;
1115         if (cfg->peer_pfx)
1116                 ifa->peer_addr = *cfg->peer_pfx;
1117
1118         spin_lock_init(&ifa->lock);
1119         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1120         INIT_HLIST_NODE(&ifa->addr_lst);
1121         ifa->scope = cfg->scope;
1122         ifa->prefix_len = cfg->plen;
1123         ifa->rt_priority = cfg->rt_priority;
1124         ifa->flags = cfg->ifa_flags;
1125         ifa->ifa_proto = cfg->ifa_proto;
1126         /* No need to add the TENTATIVE flag for addresses with NODAD */
1127         if (!(cfg->ifa_flags & IFA_F_NODAD))
1128                 ifa->flags |= IFA_F_TENTATIVE;
1129         ifa->valid_lft = cfg->valid_lft;
1130         ifa->prefered_lft = cfg->preferred_lft;
1131         ifa->cstamp = ifa->tstamp = jiffies;
1132         ifa->tokenized = false;
1133
1134         ifa->rt = f6i;
1135
1136         ifa->idev = idev;
1137         in6_dev_hold(idev);
1138
1139         /* For caller */
1140         refcount_set(&ifa->refcnt, 1);
1141
1142         rcu_read_lock_bh();
1143
1144         err = ipv6_add_addr_hash(idev->dev, ifa);
1145         if (err < 0) {
1146                 rcu_read_unlock_bh();
1147                 goto out;
1148         }
1149
1150         write_lock(&idev->lock);
1151
1152         /* Add to inet6_dev unicast addr list. */
1153         ipv6_link_dev_addr(idev, ifa);
1154
1155         if (ifa->flags&IFA_F_TEMPORARY) {
1156                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1157                 in6_ifa_hold(ifa);
1158         }
1159
1160         in6_ifa_hold(ifa);
1161         write_unlock(&idev->lock);
1162
1163         rcu_read_unlock_bh();
1164
1165         inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1166 out:
1167         if (unlikely(err < 0)) {
1168                 fib6_info_release(f6i);
1169
1170                 if (ifa) {
1171                         if (ifa->idev)
1172                                 in6_dev_put(ifa->idev);
1173                         kfree(ifa);
1174                 }
1175                 ifa = ERR_PTR(err);
1176         }
1177
1178         return ifa;
1179 }
1180
1181 enum cleanup_prefix_rt_t {
1182         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1183         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1184         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1185 };
1186
1187 /*
1188  * Check, whether the prefix for ifp would still need a prefix route
1189  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1190  * constants.
1191  *
1192  * 1) we don't purge prefix if address was not permanent.
1193  *    prefix is managed by its own lifetime.
1194  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1195  * 3) if there are no addresses, delete prefix.
1196  * 4) if there are still other permanent address(es),
1197  *    corresponding prefix is still permanent.
1198  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1199  *    don't purge the prefix, assume user space is managing it.
1200  * 6) otherwise, update prefix lifetime to the
1201  *    longest valid lifetime among the corresponding
1202  *    addresses on the device.
1203  *    Note: subsequent RA will update lifetime.
1204  **/
1205 static enum cleanup_prefix_rt_t
1206 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1207 {
1208         struct inet6_ifaddr *ifa;
1209         struct inet6_dev *idev = ifp->idev;
1210         unsigned long lifetime;
1211         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1212
1213         *expires = jiffies;
1214
1215         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1216                 if (ifa == ifp)
1217                         continue;
1218                 if (ifa->prefix_len != ifp->prefix_len ||
1219                     !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1220                                        ifp->prefix_len))
1221                         continue;
1222                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1223                         return CLEANUP_PREFIX_RT_NOP;
1224
1225                 action = CLEANUP_PREFIX_RT_EXPIRE;
1226
1227                 spin_lock(&ifa->lock);
1228
1229                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1230                 /*
1231                  * Note: Because this address is
1232                  * not permanent, lifetime <
1233                  * LONG_MAX / HZ here.
1234                  */
1235                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1236                         *expires = ifa->tstamp + lifetime * HZ;
1237                 spin_unlock(&ifa->lock);
1238         }
1239
1240         return action;
1241 }
1242
1243 static void
1244 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1245                      bool del_rt, bool del_peer)
1246 {
1247         struct fib6_info *f6i;
1248
1249         f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1250                                         ifp->prefix_len,
1251                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
1252         if (f6i) {
1253                 if (del_rt)
1254                         ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1255                 else {
1256                         if (!(f6i->fib6_flags & RTF_EXPIRES))
1257                                 fib6_set_expires(f6i, expires);
1258                         fib6_info_release(f6i);
1259                 }
1260         }
1261 }
1262
1263
1264 /* This function wants to get referenced ifp and releases it before return */
1265
1266 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1267 {
1268         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1269         struct net *net = dev_net(ifp->idev->dev);
1270         unsigned long expires;
1271         int state;
1272
1273         ASSERT_RTNL();
1274
1275         spin_lock_bh(&ifp->lock);
1276         state = ifp->state;
1277         ifp->state = INET6_IFADDR_STATE_DEAD;
1278         spin_unlock_bh(&ifp->lock);
1279
1280         if (state == INET6_IFADDR_STATE_DEAD)
1281                 goto out;
1282
1283         spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1284         hlist_del_init_rcu(&ifp->addr_lst);
1285         spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1286
1287         write_lock_bh(&ifp->idev->lock);
1288
1289         if (ifp->flags&IFA_F_TEMPORARY) {
1290                 list_del(&ifp->tmp_list);
1291                 if (ifp->ifpub) {
1292                         in6_ifa_put(ifp->ifpub);
1293                         ifp->ifpub = NULL;
1294                 }
1295                 __in6_ifa_put(ifp);
1296         }
1297
1298         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1299                 action = check_cleanup_prefix_route(ifp, &expires);
1300
1301         list_del_rcu(&ifp->if_list);
1302         __in6_ifa_put(ifp);
1303
1304         write_unlock_bh(&ifp->idev->lock);
1305
1306         addrconf_del_dad_work(ifp);
1307
1308         ipv6_ifa_notify(RTM_DELADDR, ifp);
1309
1310         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1311
1312         if (action != CLEANUP_PREFIX_RT_NOP) {
1313                 cleanup_prefix_route(ifp, expires,
1314                         action == CLEANUP_PREFIX_RT_DEL, false);
1315         }
1316
1317         /* clean up prefsrc entries */
1318         rt6_remove_prefsrc(ifp);
1319 out:
1320         in6_ifa_put(ifp);
1321 }
1322
1323 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1324 {
1325         struct inet6_dev *idev = ifp->idev;
1326         unsigned long tmp_tstamp, age;
1327         unsigned long regen_advance;
1328         unsigned long now = jiffies;
1329         s32 cnf_temp_preferred_lft;
1330         struct inet6_ifaddr *ift;
1331         struct ifa6_config cfg;
1332         long max_desync_factor;
1333         struct in6_addr addr;
1334         int ret = 0;
1335
1336         write_lock_bh(&idev->lock);
1337
1338 retry:
1339         in6_dev_hold(idev);
1340         if (idev->cnf.use_tempaddr <= 0) {
1341                 write_unlock_bh(&idev->lock);
1342                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1343                 in6_dev_put(idev);
1344                 ret = -1;
1345                 goto out;
1346         }
1347         spin_lock_bh(&ifp->lock);
1348         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1349                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1350                 spin_unlock_bh(&ifp->lock);
1351                 write_unlock_bh(&idev->lock);
1352                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1353                         __func__);
1354                 in6_dev_put(idev);
1355                 ret = -1;
1356                 goto out;
1357         }
1358         in6_ifa_hold(ifp);
1359         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1360         ipv6_gen_rnd_iid(&addr);
1361
1362         age = (now - ifp->tstamp) / HZ;
1363
1364         regen_advance = idev->cnf.regen_max_retry *
1365                         idev->cnf.dad_transmits *
1366                         max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1367
1368         /* recalculate max_desync_factor each time and update
1369          * idev->desync_factor if it's larger
1370          */
1371         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1372         max_desync_factor = min_t(__u32,
1373                                   idev->cnf.max_desync_factor,
1374                                   cnf_temp_preferred_lft - regen_advance);
1375
1376         if (unlikely(idev->desync_factor > max_desync_factor)) {
1377                 if (max_desync_factor > 0) {
1378                         get_random_bytes(&idev->desync_factor,
1379                                          sizeof(idev->desync_factor));
1380                         idev->desync_factor %= max_desync_factor;
1381                 } else {
1382                         idev->desync_factor = 0;
1383                 }
1384         }
1385
1386         memset(&cfg, 0, sizeof(cfg));
1387         cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1388                               idev->cnf.temp_valid_lft + age);
1389         cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1390         cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1391
1392         cfg.plen = ifp->prefix_len;
1393         tmp_tstamp = ifp->tstamp;
1394         spin_unlock_bh(&ifp->lock);
1395
1396         write_unlock_bh(&idev->lock);
1397
1398         /* A temporary address is created only if this calculated Preferred
1399          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1400          * an implementation must not create a temporary address with a zero
1401          * Preferred Lifetime.
1402          * Use age calculation as in addrconf_verify to avoid unnecessary
1403          * temporary addresses being generated.
1404          */
1405         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1406         if (cfg.preferred_lft <= regen_advance + age) {
1407                 in6_ifa_put(ifp);
1408                 in6_dev_put(idev);
1409                 ret = -1;
1410                 goto out;
1411         }
1412
1413         cfg.ifa_flags = IFA_F_TEMPORARY;
1414         /* set in addrconf_prefix_rcv() */
1415         if (ifp->flags & IFA_F_OPTIMISTIC)
1416                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1417
1418         cfg.pfx = &addr;
1419         cfg.scope = ipv6_addr_scope(cfg.pfx);
1420
1421         ift = ipv6_add_addr(idev, &cfg, block, NULL);
1422         if (IS_ERR(ift)) {
1423                 in6_ifa_put(ifp);
1424                 in6_dev_put(idev);
1425                 pr_info("%s: retry temporary address regeneration\n", __func__);
1426                 write_lock_bh(&idev->lock);
1427                 goto retry;
1428         }
1429
1430         spin_lock_bh(&ift->lock);
1431         ift->ifpub = ifp;
1432         ift->cstamp = now;
1433         ift->tstamp = tmp_tstamp;
1434         spin_unlock_bh(&ift->lock);
1435
1436         addrconf_dad_start(ift);
1437         in6_ifa_put(ift);
1438         in6_dev_put(idev);
1439 out:
1440         return ret;
1441 }
1442
1443 /*
1444  *      Choose an appropriate source address (RFC3484)
1445  */
1446 enum {
1447         IPV6_SADDR_RULE_INIT = 0,
1448         IPV6_SADDR_RULE_LOCAL,
1449         IPV6_SADDR_RULE_SCOPE,
1450         IPV6_SADDR_RULE_PREFERRED,
1451 #ifdef CONFIG_IPV6_MIP6
1452         IPV6_SADDR_RULE_HOA,
1453 #endif
1454         IPV6_SADDR_RULE_OIF,
1455         IPV6_SADDR_RULE_LABEL,
1456         IPV6_SADDR_RULE_PRIVACY,
1457         IPV6_SADDR_RULE_ORCHID,
1458         IPV6_SADDR_RULE_PREFIX,
1459 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1460         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1461 #endif
1462         IPV6_SADDR_RULE_MAX
1463 };
1464
1465 struct ipv6_saddr_score {
1466         int                     rule;
1467         int                     addr_type;
1468         struct inet6_ifaddr     *ifa;
1469         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1470         int                     scopedist;
1471         int                     matchlen;
1472 };
1473
1474 struct ipv6_saddr_dst {
1475         const struct in6_addr *addr;
1476         int ifindex;
1477         int scope;
1478         int label;
1479         unsigned int prefs;
1480 };
1481
1482 static inline int ipv6_saddr_preferred(int type)
1483 {
1484         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1485                 return 1;
1486         return 0;
1487 }
1488
1489 static bool ipv6_use_optimistic_addr(struct net *net,
1490                                      struct inet6_dev *idev)
1491 {
1492 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1493         if (!idev)
1494                 return false;
1495         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1496                 return false;
1497         if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1498                 return false;
1499
1500         return true;
1501 #else
1502         return false;
1503 #endif
1504 }
1505
1506 static bool ipv6_allow_optimistic_dad(struct net *net,
1507                                       struct inet6_dev *idev)
1508 {
1509 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1510         if (!idev)
1511                 return false;
1512         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1513                 return false;
1514
1515         return true;
1516 #else
1517         return false;
1518 #endif
1519 }
1520
1521 static int ipv6_get_saddr_eval(struct net *net,
1522                                struct ipv6_saddr_score *score,
1523                                struct ipv6_saddr_dst *dst,
1524                                int i)
1525 {
1526         int ret;
1527
1528         if (i <= score->rule) {
1529                 switch (i) {
1530                 case IPV6_SADDR_RULE_SCOPE:
1531                         ret = score->scopedist;
1532                         break;
1533                 case IPV6_SADDR_RULE_PREFIX:
1534                         ret = score->matchlen;
1535                         break;
1536                 default:
1537                         ret = !!test_bit(i, score->scorebits);
1538                 }
1539                 goto out;
1540         }
1541
1542         switch (i) {
1543         case IPV6_SADDR_RULE_INIT:
1544                 /* Rule 0: remember if hiscore is not ready yet */
1545                 ret = !!score->ifa;
1546                 break;
1547         case IPV6_SADDR_RULE_LOCAL:
1548                 /* Rule 1: Prefer same address */
1549                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1550                 break;
1551         case IPV6_SADDR_RULE_SCOPE:
1552                 /* Rule 2: Prefer appropriate scope
1553                  *
1554                  *      ret
1555                  *       ^
1556                  *    -1 |  d 15
1557                  *    ---+--+-+---> scope
1558                  *       |
1559                  *       |             d is scope of the destination.
1560                  *  B-d  |  \
1561                  *       |   \      <- smaller scope is better if
1562                  *  B-15 |    \        if scope is enough for destination.
1563                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1564                  * d-C-1 | /
1565                  *       |/         <- greater is better
1566                  *   -C  /             if scope is not enough for destination.
1567                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1568                  *
1569                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1570                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1571                  * Assume B = 0 and we get C > 29.
1572                  */
1573                 ret = __ipv6_addr_src_scope(score->addr_type);
1574                 if (ret >= dst->scope)
1575                         ret = -ret;
1576                 else
1577                         ret -= 128;     /* 30 is enough */
1578                 score->scopedist = ret;
1579                 break;
1580         case IPV6_SADDR_RULE_PREFERRED:
1581             {
1582                 /* Rule 3: Avoid deprecated and optimistic addresses */
1583                 u8 avoid = IFA_F_DEPRECATED;
1584
1585                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1586                         avoid |= IFA_F_OPTIMISTIC;
1587                 ret = ipv6_saddr_preferred(score->addr_type) ||
1588                       !(score->ifa->flags & avoid);
1589                 break;
1590             }
1591 #ifdef CONFIG_IPV6_MIP6
1592         case IPV6_SADDR_RULE_HOA:
1593             {
1594                 /* Rule 4: Prefer home address */
1595                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1596                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1597                 break;
1598             }
1599 #endif
1600         case IPV6_SADDR_RULE_OIF:
1601                 /* Rule 5: Prefer outgoing interface */
1602                 ret = (!dst->ifindex ||
1603                        dst->ifindex == score->ifa->idev->dev->ifindex);
1604                 break;
1605         case IPV6_SADDR_RULE_LABEL:
1606                 /* Rule 6: Prefer matching label */
1607                 ret = ipv6_addr_label(net,
1608                                       &score->ifa->addr, score->addr_type,
1609                                       score->ifa->idev->dev->ifindex) == dst->label;
1610                 break;
1611         case IPV6_SADDR_RULE_PRIVACY:
1612             {
1613                 /* Rule 7: Prefer public address
1614                  * Note: prefer temporary address if use_tempaddr >= 2
1615                  */
1616                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1617                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1618                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1619                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1620                 break;
1621             }
1622         case IPV6_SADDR_RULE_ORCHID:
1623                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1624                  *          non-ORCHID vs non-ORCHID
1625                  */
1626                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1627                         ipv6_addr_orchid(dst->addr));
1628                 break;
1629         case IPV6_SADDR_RULE_PREFIX:
1630                 /* Rule 8: Use longest matching prefix */
1631                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1632                 if (ret > score->ifa->prefix_len)
1633                         ret = score->ifa->prefix_len;
1634                 score->matchlen = ret;
1635                 break;
1636 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1637         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1638                 /* Optimistic addresses still have lower precedence than other
1639                  * preferred addresses.
1640                  */
1641                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1642                 break;
1643 #endif
1644         default:
1645                 ret = 0;
1646         }
1647
1648         if (ret)
1649                 __set_bit(i, score->scorebits);
1650         score->rule = i;
1651 out:
1652         return ret;
1653 }
1654
1655 static int __ipv6_dev_get_saddr(struct net *net,
1656                                 struct ipv6_saddr_dst *dst,
1657                                 struct inet6_dev *idev,
1658                                 struct ipv6_saddr_score *scores,
1659                                 int hiscore_idx)
1660 {
1661         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1662
1663         list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1664                 int i;
1665
1666                 /*
1667                  * - Tentative Address (RFC2462 section 5.4)
1668                  *  - A tentative address is not considered
1669                  *    "assigned to an interface" in the traditional
1670                  *    sense, unless it is also flagged as optimistic.
1671                  * - Candidate Source Address (section 4)
1672                  *  - In any case, anycast addresses, multicast
1673                  *    addresses, and the unspecified address MUST
1674                  *    NOT be included in a candidate set.
1675                  */
1676                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1677                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1678                         continue;
1679
1680                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1681
1682                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1683                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1684                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1685                                             idev->dev->name);
1686                         continue;
1687                 }
1688
1689                 score->rule = -1;
1690                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1691
1692                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1693                         int minihiscore, miniscore;
1694
1695                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1696                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1697
1698                         if (minihiscore > miniscore) {
1699                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1700                                     score->scopedist > 0) {
1701                                         /*
1702                                          * special case:
1703                                          * each remaining entry
1704                                          * has too small (not enough)
1705                                          * scope, because ifa entries
1706                                          * are sorted by their scope
1707                                          * values.
1708                                          */
1709                                         goto out;
1710                                 }
1711                                 break;
1712                         } else if (minihiscore < miniscore) {
1713                                 swap(hiscore, score);
1714                                 hiscore_idx = 1 - hiscore_idx;
1715
1716                                 /* restore our iterator */
1717                                 score->ifa = hiscore->ifa;
1718
1719                                 break;
1720                         }
1721                 }
1722         }
1723 out:
1724         return hiscore_idx;
1725 }
1726
1727 static int ipv6_get_saddr_master(struct net *net,
1728                                  const struct net_device *dst_dev,
1729                                  const struct net_device *master,
1730                                  struct ipv6_saddr_dst *dst,
1731                                  struct ipv6_saddr_score *scores,
1732                                  int hiscore_idx)
1733 {
1734         struct inet6_dev *idev;
1735
1736         idev = __in6_dev_get(dst_dev);
1737         if (idev)
1738                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1739                                                    scores, hiscore_idx);
1740
1741         idev = __in6_dev_get(master);
1742         if (idev)
1743                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1744                                                    scores, hiscore_idx);
1745
1746         return hiscore_idx;
1747 }
1748
1749 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1750                        const struct in6_addr *daddr, unsigned int prefs,
1751                        struct in6_addr *saddr)
1752 {
1753         struct ipv6_saddr_score scores[2], *hiscore;
1754         struct ipv6_saddr_dst dst;
1755         struct inet6_dev *idev;
1756         struct net_device *dev;
1757         int dst_type;
1758         bool use_oif_addr = false;
1759         int hiscore_idx = 0;
1760         int ret = 0;
1761
1762         dst_type = __ipv6_addr_type(daddr);
1763         dst.addr = daddr;
1764         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1765         dst.scope = __ipv6_addr_src_scope(dst_type);
1766         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1767         dst.prefs = prefs;
1768
1769         scores[hiscore_idx].rule = -1;
1770         scores[hiscore_idx].ifa = NULL;
1771
1772         rcu_read_lock();
1773
1774         /* Candidate Source Address (section 4)
1775          *  - multicast and link-local destination address,
1776          *    the set of candidate source address MUST only
1777          *    include addresses assigned to interfaces
1778          *    belonging to the same link as the outgoing
1779          *    interface.
1780          * (- For site-local destination addresses, the
1781          *    set of candidate source addresses MUST only
1782          *    include addresses assigned to interfaces
1783          *    belonging to the same site as the outgoing
1784          *    interface.)
1785          *  - "It is RECOMMENDED that the candidate source addresses
1786          *    be the set of unicast addresses assigned to the
1787          *    interface that will be used to send to the destination
1788          *    (the 'outgoing' interface)." (RFC 6724)
1789          */
1790         if (dst_dev) {
1791                 idev = __in6_dev_get(dst_dev);
1792                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1793                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1794                     (idev && idev->cnf.use_oif_addrs_only)) {
1795                         use_oif_addr = true;
1796                 }
1797         }
1798
1799         if (use_oif_addr) {
1800                 if (idev)
1801                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1802         } else {
1803                 const struct net_device *master;
1804                 int master_idx = 0;
1805
1806                 /* if dst_dev exists and is enslaved to an L3 device, then
1807                  * prefer addresses from dst_dev and then the master over
1808                  * any other enslaved devices in the L3 domain.
1809                  */
1810                 master = l3mdev_master_dev_rcu(dst_dev);
1811                 if (master) {
1812                         master_idx = master->ifindex;
1813
1814                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1815                                                             master, &dst,
1816                                                             scores, hiscore_idx);
1817
1818                         if (scores[hiscore_idx].ifa)
1819                                 goto out;
1820                 }
1821
1822                 for_each_netdev_rcu(net, dev) {
1823                         /* only consider addresses on devices in the
1824                          * same L3 domain
1825                          */
1826                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1827                                 continue;
1828                         idev = __in6_dev_get(dev);
1829                         if (!idev)
1830                                 continue;
1831                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1832                 }
1833         }
1834
1835 out:
1836         hiscore = &scores[hiscore_idx];
1837         if (!hiscore->ifa)
1838                 ret = -EADDRNOTAVAIL;
1839         else
1840                 *saddr = hiscore->ifa->addr;
1841
1842         rcu_read_unlock();
1843         return ret;
1844 }
1845 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1846
1847 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1848                               u32 banned_flags)
1849 {
1850         struct inet6_ifaddr *ifp;
1851         int err = -EADDRNOTAVAIL;
1852
1853         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1854                 if (ifp->scope > IFA_LINK)
1855                         break;
1856                 if (ifp->scope == IFA_LINK &&
1857                     !(ifp->flags & banned_flags)) {
1858                         *addr = ifp->addr;
1859                         err = 0;
1860                         break;
1861                 }
1862         }
1863         return err;
1864 }
1865
1866 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1867                     u32 banned_flags)
1868 {
1869         struct inet6_dev *idev;
1870         int err = -EADDRNOTAVAIL;
1871
1872         rcu_read_lock();
1873         idev = __in6_dev_get(dev);
1874         if (idev) {
1875                 read_lock_bh(&idev->lock);
1876                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1877                 read_unlock_bh(&idev->lock);
1878         }
1879         rcu_read_unlock();
1880         return err;
1881 }
1882
1883 static int ipv6_count_addresses(const struct inet6_dev *idev)
1884 {
1885         const struct inet6_ifaddr *ifp;
1886         int cnt = 0;
1887
1888         rcu_read_lock();
1889         list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1890                 cnt++;
1891         rcu_read_unlock();
1892         return cnt;
1893 }
1894
1895 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1896                   const struct net_device *dev, int strict)
1897 {
1898         return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1899                                        strict, IFA_F_TENTATIVE);
1900 }
1901 EXPORT_SYMBOL(ipv6_chk_addr);
1902
1903 /* device argument is used to find the L3 domain of interest. If
1904  * skip_dev_check is set, then the ifp device is not checked against
1905  * the passed in dev argument. So the 2 cases for addresses checks are:
1906  *   1. does the address exist in the L3 domain that dev is part of
1907  *      (skip_dev_check = true), or
1908  *
1909  *   2. does the address exist on the specific device
1910  *      (skip_dev_check = false)
1911  */
1912 static struct net_device *
1913 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1914                           const struct net_device *dev, bool skip_dev_check,
1915                           int strict, u32 banned_flags)
1916 {
1917         unsigned int hash = inet6_addr_hash(net, addr);
1918         struct net_device *l3mdev, *ndev;
1919         struct inet6_ifaddr *ifp;
1920         u32 ifp_flags;
1921
1922         rcu_read_lock();
1923
1924         l3mdev = l3mdev_master_dev_rcu(dev);
1925         if (skip_dev_check)
1926                 dev = NULL;
1927
1928         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1929                 ndev = ifp->idev->dev;
1930
1931                 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1932                         continue;
1933
1934                 /* Decouple optimistic from tentative for evaluation here.
1935                  * Ban optimistic addresses explicitly, when required.
1936                  */
1937                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1938                             ? (ifp->flags&~IFA_F_TENTATIVE)
1939                             : ifp->flags;
1940                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1941                     !(ifp_flags&banned_flags) &&
1942                     (!dev || ndev == dev ||
1943                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1944                         rcu_read_unlock();
1945                         return ndev;
1946                 }
1947         }
1948
1949         rcu_read_unlock();
1950         return NULL;
1951 }
1952
1953 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1954                             const struct net_device *dev, bool skip_dev_check,
1955                             int strict, u32 banned_flags)
1956 {
1957         return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1958                                          strict, banned_flags) ? 1 : 0;
1959 }
1960 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1961
1962
1963 /* Compares an address/prefix_len with addresses on device @dev.
1964  * If one is found it returns true.
1965  */
1966 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1967         const unsigned int prefix_len, struct net_device *dev)
1968 {
1969         const struct inet6_ifaddr *ifa;
1970         const struct inet6_dev *idev;
1971         bool ret = false;
1972
1973         rcu_read_lock();
1974         idev = __in6_dev_get(dev);
1975         if (idev) {
1976                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1977                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1978                         if (ret)
1979                                 break;
1980                 }
1981         }
1982         rcu_read_unlock();
1983
1984         return ret;
1985 }
1986 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1987
1988 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1989 {
1990         const struct inet6_ifaddr *ifa;
1991         const struct inet6_dev *idev;
1992         int     onlink;
1993
1994         onlink = 0;
1995         rcu_read_lock();
1996         idev = __in6_dev_get(dev);
1997         if (idev) {
1998                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1999                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
2000                                                    ifa->prefix_len);
2001                         if (onlink)
2002                                 break;
2003                 }
2004         }
2005         rcu_read_unlock();
2006         return onlink;
2007 }
2008 EXPORT_SYMBOL(ipv6_chk_prefix);
2009
2010 /**
2011  * ipv6_dev_find - find the first device with a given source address.
2012  * @net: the net namespace
2013  * @addr: the source address
2014  * @dev: used to find the L3 domain of interest
2015  *
2016  * The caller should be protected by RCU, or RTNL.
2017  */
2018 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2019                                  struct net_device *dev)
2020 {
2021         return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2022                                          IFA_F_TENTATIVE);
2023 }
2024 EXPORT_SYMBOL(ipv6_dev_find);
2025
2026 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2027                                      struct net_device *dev, int strict)
2028 {
2029         unsigned int hash = inet6_addr_hash(net, addr);
2030         struct inet6_ifaddr *ifp, *result = NULL;
2031
2032         rcu_read_lock();
2033         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2034                 if (ipv6_addr_equal(&ifp->addr, addr)) {
2035                         if (!dev || ifp->idev->dev == dev ||
2036                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2037                                 result = ifp;
2038                                 in6_ifa_hold(ifp);
2039                                 break;
2040                         }
2041                 }
2042         }
2043         rcu_read_unlock();
2044
2045         return result;
2046 }
2047
2048 /* Gets referenced address, destroys ifaddr */
2049
2050 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2051 {
2052         if (dad_failed)
2053                 ifp->flags |= IFA_F_DADFAILED;
2054
2055         if (ifp->flags&IFA_F_TEMPORARY) {
2056                 struct inet6_ifaddr *ifpub;
2057                 spin_lock_bh(&ifp->lock);
2058                 ifpub = ifp->ifpub;
2059                 if (ifpub) {
2060                         in6_ifa_hold(ifpub);
2061                         spin_unlock_bh(&ifp->lock);
2062                         ipv6_create_tempaddr(ifpub, true);
2063                         in6_ifa_put(ifpub);
2064                 } else {
2065                         spin_unlock_bh(&ifp->lock);
2066                 }
2067                 ipv6_del_addr(ifp);
2068         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2069                 spin_lock_bh(&ifp->lock);
2070                 addrconf_del_dad_work(ifp);
2071                 ifp->flags |= IFA_F_TENTATIVE;
2072                 if (dad_failed)
2073                         ifp->flags &= ~IFA_F_OPTIMISTIC;
2074                 spin_unlock_bh(&ifp->lock);
2075                 if (dad_failed)
2076                         ipv6_ifa_notify(0, ifp);
2077                 in6_ifa_put(ifp);
2078         } else {
2079                 ipv6_del_addr(ifp);
2080         }
2081 }
2082
2083 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2084 {
2085         int err = -ENOENT;
2086
2087         spin_lock_bh(&ifp->lock);
2088         if (ifp->state == INET6_IFADDR_STATE_DAD) {
2089                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2090                 err = 0;
2091         }
2092         spin_unlock_bh(&ifp->lock);
2093
2094         return err;
2095 }
2096
2097 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2098 {
2099         struct inet6_dev *idev = ifp->idev;
2100         struct net *net = dev_net(idev->dev);
2101
2102         if (addrconf_dad_end(ifp)) {
2103                 in6_ifa_put(ifp);
2104                 return;
2105         }
2106
2107         net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2108                              ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2109
2110         spin_lock_bh(&ifp->lock);
2111
2112         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2113                 struct in6_addr new_addr;
2114                 struct inet6_ifaddr *ifp2;
2115                 int retries = ifp->stable_privacy_retry + 1;
2116                 struct ifa6_config cfg = {
2117                         .pfx = &new_addr,
2118                         .plen = ifp->prefix_len,
2119                         .ifa_flags = ifp->flags,
2120                         .valid_lft = ifp->valid_lft,
2121                         .preferred_lft = ifp->prefered_lft,
2122                         .scope = ifp->scope,
2123                 };
2124
2125                 if (retries > net->ipv6.sysctl.idgen_retries) {
2126                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2127                                              ifp->idev->dev->name);
2128                         goto errdad;
2129                 }
2130
2131                 new_addr = ifp->addr;
2132                 if (ipv6_generate_stable_address(&new_addr, retries,
2133                                                  idev))
2134                         goto errdad;
2135
2136                 spin_unlock_bh(&ifp->lock);
2137
2138                 if (idev->cnf.max_addresses &&
2139                     ipv6_count_addresses(idev) >=
2140                     idev->cnf.max_addresses)
2141                         goto lock_errdad;
2142
2143                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2144                                      ifp->idev->dev->name);
2145
2146                 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2147                 if (IS_ERR(ifp2))
2148                         goto lock_errdad;
2149
2150                 spin_lock_bh(&ifp2->lock);
2151                 ifp2->stable_privacy_retry = retries;
2152                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2153                 spin_unlock_bh(&ifp2->lock);
2154
2155                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2156                 in6_ifa_put(ifp2);
2157 lock_errdad:
2158                 spin_lock_bh(&ifp->lock);
2159         }
2160
2161 errdad:
2162         /* transition from _POSTDAD to _ERRDAD */
2163         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2164         spin_unlock_bh(&ifp->lock);
2165
2166         addrconf_mod_dad_work(ifp, 0);
2167         in6_ifa_put(ifp);
2168 }
2169
2170 /* Join to solicited addr multicast group.
2171  * caller must hold RTNL */
2172 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2173 {
2174         struct in6_addr maddr;
2175
2176         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2177                 return;
2178
2179         addrconf_addr_solict_mult(addr, &maddr);
2180         ipv6_dev_mc_inc(dev, &maddr);
2181 }
2182
2183 /* caller must hold RTNL */
2184 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2185 {
2186         struct in6_addr maddr;
2187
2188         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2189                 return;
2190
2191         addrconf_addr_solict_mult(addr, &maddr);
2192         __ipv6_dev_mc_dec(idev, &maddr);
2193 }
2194
2195 /* caller must hold RTNL */
2196 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2197 {
2198         struct in6_addr addr;
2199
2200         if (ifp->prefix_len >= 127) /* RFC 6164 */
2201                 return;
2202         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2203         if (ipv6_addr_any(&addr))
2204                 return;
2205         __ipv6_dev_ac_inc(ifp->idev, &addr);
2206 }
2207
2208 /* caller must hold RTNL */
2209 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2210 {
2211         struct in6_addr addr;
2212
2213         if (ifp->prefix_len >= 127) /* RFC 6164 */
2214                 return;
2215         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2216         if (ipv6_addr_any(&addr))
2217                 return;
2218         __ipv6_dev_ac_dec(ifp->idev, &addr);
2219 }
2220
2221 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2222 {
2223         switch (dev->addr_len) {
2224         case ETH_ALEN:
2225                 memcpy(eui, dev->dev_addr, 3);
2226                 eui[3] = 0xFF;
2227                 eui[4] = 0xFE;
2228                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2229                 break;
2230         case EUI64_ADDR_LEN:
2231                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2232                 eui[0] ^= 2;
2233                 break;
2234         default:
2235                 return -1;
2236         }
2237
2238         return 0;
2239 }
2240
2241 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2242 {
2243         const union fwnet_hwaddr *ha;
2244
2245         if (dev->addr_len != FWNET_ALEN)
2246                 return -1;
2247
2248         ha = (const union fwnet_hwaddr *)dev->dev_addr;
2249
2250         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2251         eui[0] ^= 2;
2252         return 0;
2253 }
2254
2255 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2256 {
2257         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2258         if (dev->addr_len != ARCNET_ALEN)
2259                 return -1;
2260         memset(eui, 0, 7);
2261         eui[7] = *(u8 *)dev->dev_addr;
2262         return 0;
2263 }
2264
2265 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2266 {
2267         if (dev->addr_len != INFINIBAND_ALEN)
2268                 return -1;
2269         memcpy(eui, dev->dev_addr + 12, 8);
2270         eui[0] |= 2;
2271         return 0;
2272 }
2273
2274 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2275 {
2276         if (addr == 0)
2277                 return -1;
2278         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2279                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2280                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2281                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2282                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2283                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2284         eui[1] = 0;
2285         eui[2] = 0x5E;
2286         eui[3] = 0xFE;
2287         memcpy(eui + 4, &addr, 4);
2288         return 0;
2289 }
2290
2291 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2292 {
2293         if (dev->priv_flags & IFF_ISATAP)
2294                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2295         return -1;
2296 }
2297
2298 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2299 {
2300         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2301 }
2302
2303 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2304 {
2305         memcpy(eui, dev->perm_addr, 3);
2306         memcpy(eui + 5, dev->perm_addr + 3, 3);
2307         eui[3] = 0xFF;
2308         eui[4] = 0xFE;
2309         eui[0] ^= 2;
2310         return 0;
2311 }
2312
2313 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2314 {
2315         switch (dev->type) {
2316         case ARPHRD_ETHER:
2317         case ARPHRD_FDDI:
2318                 return addrconf_ifid_eui48(eui, dev);
2319         case ARPHRD_ARCNET:
2320                 return addrconf_ifid_arcnet(eui, dev);
2321         case ARPHRD_INFINIBAND:
2322                 return addrconf_ifid_infiniband(eui, dev);
2323         case ARPHRD_SIT:
2324                 return addrconf_ifid_sit(eui, dev);
2325         case ARPHRD_IPGRE:
2326         case ARPHRD_TUNNEL:
2327                 return addrconf_ifid_gre(eui, dev);
2328         case ARPHRD_6LOWPAN:
2329                 return addrconf_ifid_6lowpan(eui, dev);
2330         case ARPHRD_IEEE1394:
2331                 return addrconf_ifid_ieee1394(eui, dev);
2332         case ARPHRD_TUNNEL6:
2333         case ARPHRD_IP6GRE:
2334         case ARPHRD_RAWIP:
2335                 return addrconf_ifid_ip6tnl(eui, dev);
2336         }
2337         return -1;
2338 }
2339
2340 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2341 {
2342         int err = -1;
2343         struct inet6_ifaddr *ifp;
2344
2345         read_lock_bh(&idev->lock);
2346         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2347                 if (ifp->scope > IFA_LINK)
2348                         break;
2349                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2350                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2351                         err = 0;
2352                         break;
2353                 }
2354         }
2355         read_unlock_bh(&idev->lock);
2356         return err;
2357 }
2358
2359 /* Generation of a randomized Interface Identifier
2360  * draft-ietf-6man-rfc4941bis, Section 3.3.1
2361  */
2362
2363 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2364 {
2365 regen:
2366         get_random_bytes(&addr->s6_addr[8], 8);
2367
2368         /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2369          * check if generated address is not inappropriate:
2370          *
2371          * - Reserved IPv6 Interface Identifiers
2372          * - XXX: already assigned to an address on the device
2373          */
2374
2375         /* Subnet-router anycast: 0000:0000:0000:0000 */
2376         if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2377                 goto regen;
2378
2379         /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2380          * Proxy Mobile IPv6:   0200:5EFF:FE00:5213
2381          * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2382          */
2383         if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2384             (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2385                 goto regen;
2386
2387         /* Reserved subnet anycast addresses */
2388         if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2389             ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2390                 goto regen;
2391 }
2392
2393 /*
2394  *      Add prefix route.
2395  */
2396
2397 static void
2398 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2399                       struct net_device *dev, unsigned long expires,
2400                       u32 flags, gfp_t gfp_flags)
2401 {
2402         struct fib6_config cfg = {
2403                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2404                 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2405                 .fc_ifindex = dev->ifindex,
2406                 .fc_expires = expires,
2407                 .fc_dst_len = plen,
2408                 .fc_flags = RTF_UP | flags,
2409                 .fc_nlinfo.nl_net = dev_net(dev),
2410                 .fc_protocol = RTPROT_KERNEL,
2411                 .fc_type = RTN_UNICAST,
2412         };
2413
2414         cfg.fc_dst = *pfx;
2415
2416         /* Prevent useless cloning on PtP SIT.
2417            This thing is done here expecting that the whole
2418            class of non-broadcast devices need not cloning.
2419          */
2420 #if IS_ENABLED(CONFIG_IPV6_SIT)
2421         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2422                 cfg.fc_flags |= RTF_NONEXTHOP;
2423 #endif
2424
2425         ip6_route_add(&cfg, gfp_flags, NULL);
2426 }
2427
2428
2429 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2430                                                   int plen,
2431                                                   const struct net_device *dev,
2432                                                   u32 flags, u32 noflags,
2433                                                   bool no_gw)
2434 {
2435         struct fib6_node *fn;
2436         struct fib6_info *rt = NULL;
2437         struct fib6_table *table;
2438         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2439
2440         table = fib6_get_table(dev_net(dev), tb_id);
2441         if (!table)
2442                 return NULL;
2443
2444         rcu_read_lock();
2445         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2446         if (!fn)
2447                 goto out;
2448
2449         for_each_fib6_node_rt_rcu(fn) {
2450                 /* prefix routes only use builtin fib6_nh */
2451                 if (rt->nh)
2452                         continue;
2453
2454                 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2455                         continue;
2456                 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2457                         continue;
2458                 if ((rt->fib6_flags & flags) != flags)
2459                         continue;
2460                 if ((rt->fib6_flags & noflags) != 0)
2461                         continue;
2462                 if (!fib6_info_hold_safe(rt))
2463                         continue;
2464                 break;
2465         }
2466 out:
2467         rcu_read_unlock();
2468         return rt;
2469 }
2470
2471
2472 /* Create "default" multicast route to the interface */
2473
2474 static void addrconf_add_mroute(struct net_device *dev)
2475 {
2476         struct fib6_config cfg = {
2477                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2478                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2479                 .fc_ifindex = dev->ifindex,
2480                 .fc_dst_len = 8,
2481                 .fc_flags = RTF_UP,
2482                 .fc_type = RTN_MULTICAST,
2483                 .fc_nlinfo.nl_net = dev_net(dev),
2484                 .fc_protocol = RTPROT_KERNEL,
2485         };
2486
2487         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2488
2489         ip6_route_add(&cfg, GFP_KERNEL, NULL);
2490 }
2491
2492 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2493 {
2494         struct inet6_dev *idev;
2495
2496         ASSERT_RTNL();
2497
2498         idev = ipv6_find_idev(dev);
2499         if (IS_ERR(idev))
2500                 return idev;
2501
2502         if (idev->cnf.disable_ipv6)
2503                 return ERR_PTR(-EACCES);
2504
2505         /* Add default multicast route */
2506         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2507                 addrconf_add_mroute(dev);
2508
2509         return idev;
2510 }
2511
2512 static void manage_tempaddrs(struct inet6_dev *idev,
2513                              struct inet6_ifaddr *ifp,
2514                              __u32 valid_lft, __u32 prefered_lft,
2515                              bool create, unsigned long now)
2516 {
2517         u32 flags;
2518         struct inet6_ifaddr *ift;
2519
2520         read_lock_bh(&idev->lock);
2521         /* update all temporary addresses in the list */
2522         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2523                 int age, max_valid, max_prefered;
2524
2525                 if (ifp != ift->ifpub)
2526                         continue;
2527
2528                 /* RFC 4941 section 3.3:
2529                  * If a received option will extend the lifetime of a public
2530                  * address, the lifetimes of temporary addresses should
2531                  * be extended, subject to the overall constraint that no
2532                  * temporary addresses should ever remain "valid" or "preferred"
2533                  * for a time longer than (TEMP_VALID_LIFETIME) or
2534                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2535                  */
2536                 age = (now - ift->cstamp) / HZ;
2537                 max_valid = idev->cnf.temp_valid_lft - age;
2538                 if (max_valid < 0)
2539                         max_valid = 0;
2540
2541                 max_prefered = idev->cnf.temp_prefered_lft -
2542                                idev->desync_factor - age;
2543                 if (max_prefered < 0)
2544                         max_prefered = 0;
2545
2546                 if (valid_lft > max_valid)
2547                         valid_lft = max_valid;
2548
2549                 if (prefered_lft > max_prefered)
2550                         prefered_lft = max_prefered;
2551
2552                 spin_lock(&ift->lock);
2553                 flags = ift->flags;
2554                 ift->valid_lft = valid_lft;
2555                 ift->prefered_lft = prefered_lft;
2556                 ift->tstamp = now;
2557                 if (prefered_lft > 0)
2558                         ift->flags &= ~IFA_F_DEPRECATED;
2559
2560                 spin_unlock(&ift->lock);
2561                 if (!(flags&IFA_F_TENTATIVE))
2562                         ipv6_ifa_notify(0, ift);
2563         }
2564
2565         if ((create || list_empty(&idev->tempaddr_list)) &&
2566             idev->cnf.use_tempaddr > 0) {
2567                 /* When a new public address is created as described
2568                  * in [ADDRCONF], also create a new temporary address.
2569                  * Also create a temporary address if it's enabled but
2570                  * no temporary address currently exists.
2571                  */
2572                 read_unlock_bh(&idev->lock);
2573                 ipv6_create_tempaddr(ifp, false);
2574         } else {
2575                 read_unlock_bh(&idev->lock);
2576         }
2577 }
2578
2579 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2580 {
2581         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2582                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2583 }
2584
2585 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2586                                  const struct prefix_info *pinfo,
2587                                  struct inet6_dev *in6_dev,
2588                                  const struct in6_addr *addr, int addr_type,
2589                                  u32 addr_flags, bool sllao, bool tokenized,
2590                                  __u32 valid_lft, u32 prefered_lft)
2591 {
2592         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2593         int create = 0, update_lft = 0;
2594
2595         if (!ifp && valid_lft) {
2596                 int max_addresses = in6_dev->cnf.max_addresses;
2597                 struct ifa6_config cfg = {
2598                         .pfx = addr,
2599                         .plen = pinfo->prefix_len,
2600                         .ifa_flags = addr_flags,
2601                         .valid_lft = valid_lft,
2602                         .preferred_lft = prefered_lft,
2603                         .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2604                         .ifa_proto = IFAPROT_KERNEL_RA
2605                 };
2606
2607 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2608                 if ((net->ipv6.devconf_all->optimistic_dad ||
2609                      in6_dev->cnf.optimistic_dad) &&
2610                     !net->ipv6.devconf_all->forwarding && sllao)
2611                         cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2612 #endif
2613
2614                 /* Do not allow to create too much of autoconfigured
2615                  * addresses; this would be too easy way to crash kernel.
2616                  */
2617                 if (!max_addresses ||
2618                     ipv6_count_addresses(in6_dev) < max_addresses)
2619                         ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2620
2621                 if (IS_ERR_OR_NULL(ifp))
2622                         return -1;
2623
2624                 create = 1;
2625                 spin_lock_bh(&ifp->lock);
2626                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2627                 ifp->cstamp = jiffies;
2628                 ifp->tokenized = tokenized;
2629                 spin_unlock_bh(&ifp->lock);
2630                 addrconf_dad_start(ifp);
2631         }
2632
2633         if (ifp) {
2634                 u32 flags;
2635                 unsigned long now;
2636                 u32 stored_lft;
2637
2638                 /* update lifetime (RFC2462 5.5.3 e) */
2639                 spin_lock_bh(&ifp->lock);
2640                 now = jiffies;
2641                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2642                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2643                 else
2644                         stored_lft = 0;
2645                 if (!create && stored_lft) {
2646                         const u32 minimum_lft = min_t(u32,
2647                                 stored_lft, MIN_VALID_LIFETIME);
2648                         valid_lft = max(valid_lft, minimum_lft);
2649
2650                         /* RFC4862 Section 5.5.3e:
2651                          * "Note that the preferred lifetime of the
2652                          *  corresponding address is always reset to
2653                          *  the Preferred Lifetime in the received
2654                          *  Prefix Information option, regardless of
2655                          *  whether the valid lifetime is also reset or
2656                          *  ignored."
2657                          *
2658                          * So we should always update prefered_lft here.
2659                          */
2660                         update_lft = 1;
2661                 }
2662
2663                 if (update_lft) {
2664                         ifp->valid_lft = valid_lft;
2665                         ifp->prefered_lft = prefered_lft;
2666                         ifp->tstamp = now;
2667                         flags = ifp->flags;
2668                         ifp->flags &= ~IFA_F_DEPRECATED;
2669                         spin_unlock_bh(&ifp->lock);
2670
2671                         if (!(flags&IFA_F_TENTATIVE))
2672                                 ipv6_ifa_notify(0, ifp);
2673                 } else
2674                         spin_unlock_bh(&ifp->lock);
2675
2676                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2677                                  create, now);
2678
2679                 in6_ifa_put(ifp);
2680                 addrconf_verify(net);
2681         }
2682
2683         return 0;
2684 }
2685 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2686
2687 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2688 {
2689         struct prefix_info *pinfo;
2690         __u32 valid_lft;
2691         __u32 prefered_lft;
2692         int addr_type, err;
2693         u32 addr_flags = 0;
2694         struct inet6_dev *in6_dev;
2695         struct net *net = dev_net(dev);
2696
2697         pinfo = (struct prefix_info *) opt;
2698
2699         if (len < sizeof(struct prefix_info)) {
2700                 netdev_dbg(dev, "addrconf: prefix option too short\n");
2701                 return;
2702         }
2703
2704         /*
2705          *      Validation checks ([ADDRCONF], page 19)
2706          */
2707
2708         addr_type = ipv6_addr_type(&pinfo->prefix);
2709
2710         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2711                 return;
2712
2713         valid_lft = ntohl(pinfo->valid);
2714         prefered_lft = ntohl(pinfo->prefered);
2715
2716         if (prefered_lft > valid_lft) {
2717                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2718                 return;
2719         }
2720
2721         in6_dev = in6_dev_get(dev);
2722
2723         if (!in6_dev) {
2724                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2725                                     dev->name);
2726                 return;
2727         }
2728
2729         /*
2730          *      Two things going on here:
2731          *      1) Add routes for on-link prefixes
2732          *      2) Configure prefixes with the auto flag set
2733          */
2734
2735         if (pinfo->onlink) {
2736                 struct fib6_info *rt;
2737                 unsigned long rt_expires;
2738
2739                 /* Avoid arithmetic overflow. Really, we could
2740                  * save rt_expires in seconds, likely valid_lft,
2741                  * but it would require division in fib gc, that it
2742                  * not good.
2743                  */
2744                 if (HZ > USER_HZ)
2745                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2746                 else
2747                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2748
2749                 if (addrconf_finite_timeout(rt_expires))
2750                         rt_expires *= HZ;
2751
2752                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2753                                                pinfo->prefix_len,
2754                                                dev,
2755                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2756                                                RTF_DEFAULT, true);
2757
2758                 if (rt) {
2759                         /* Autoconf prefix route */
2760                         if (valid_lft == 0) {
2761                                 ip6_del_rt(net, rt, false);
2762                                 rt = NULL;
2763                         } else if (addrconf_finite_timeout(rt_expires)) {
2764                                 /* not infinity */
2765                                 fib6_set_expires(rt, jiffies + rt_expires);
2766                         } else {
2767                                 fib6_clean_expires(rt);
2768                         }
2769                 } else if (valid_lft) {
2770                         clock_t expires = 0;
2771                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2772                         if (addrconf_finite_timeout(rt_expires)) {
2773                                 /* not infinity */
2774                                 flags |= RTF_EXPIRES;
2775                                 expires = jiffies_to_clock_t(rt_expires);
2776                         }
2777                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2778                                               0, dev, expires, flags,
2779                                               GFP_ATOMIC);
2780                 }
2781                 fib6_info_release(rt);
2782         }
2783
2784         /* Try to figure out our local address for this prefix */
2785
2786         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2787                 struct in6_addr addr;
2788                 bool tokenized = false, dev_addr_generated = false;
2789
2790                 if (pinfo->prefix_len == 64) {
2791                         memcpy(&addr, &pinfo->prefix, 8);
2792
2793                         if (!ipv6_addr_any(&in6_dev->token)) {
2794                                 read_lock_bh(&in6_dev->lock);
2795                                 memcpy(addr.s6_addr + 8,
2796                                        in6_dev->token.s6_addr + 8, 8);
2797                                 read_unlock_bh(&in6_dev->lock);
2798                                 tokenized = true;
2799                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2800                                    !ipv6_generate_stable_address(&addr, 0,
2801                                                                  in6_dev)) {
2802                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2803                                 goto ok;
2804                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2805                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2806                                 goto put;
2807                         } else {
2808                                 dev_addr_generated = true;
2809                         }
2810                         goto ok;
2811                 }
2812                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2813                                     pinfo->prefix_len);
2814                 goto put;
2815
2816 ok:
2817                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2818                                                    &addr, addr_type,
2819                                                    addr_flags, sllao,
2820                                                    tokenized, valid_lft,
2821                                                    prefered_lft);
2822                 if (err)
2823                         goto put;
2824
2825                 /* Ignore error case here because previous prefix add addr was
2826                  * successful which will be notified.
2827                  */
2828                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2829                                               addr_type, addr_flags, sllao,
2830                                               tokenized, valid_lft,
2831                                               prefered_lft,
2832                                               dev_addr_generated);
2833         }
2834         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2835 put:
2836         in6_dev_put(in6_dev);
2837 }
2838
2839 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2840                 struct in6_ifreq *ireq)
2841 {
2842         struct ip_tunnel_parm p = { };
2843         int err;
2844
2845         if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2846                 return -EADDRNOTAVAIL;
2847
2848         p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2849         p.iph.version = 4;
2850         p.iph.ihl = 5;
2851         p.iph.protocol = IPPROTO_IPV6;
2852         p.iph.ttl = 64;
2853
2854         if (!dev->netdev_ops->ndo_tunnel_ctl)
2855                 return -EOPNOTSUPP;
2856         err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2857         if (err)
2858                 return err;
2859
2860         dev = __dev_get_by_name(net, p.name);
2861         if (!dev)
2862                 return -ENOBUFS;
2863         return dev_open(dev, NULL);
2864 }
2865
2866 /*
2867  *      Set destination address.
2868  *      Special case for SIT interfaces where we create a new "virtual"
2869  *      device.
2870  */
2871 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2872 {
2873         struct net_device *dev;
2874         struct in6_ifreq ireq;
2875         int err = -ENODEV;
2876
2877         if (!IS_ENABLED(CONFIG_IPV6_SIT))
2878                 return -ENODEV;
2879         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2880                 return -EFAULT;
2881
2882         rtnl_lock();
2883         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2884         if (dev && dev->type == ARPHRD_SIT)
2885                 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2886         rtnl_unlock();
2887         return err;
2888 }
2889
2890 static int ipv6_mc_config(struct sock *sk, bool join,
2891                           const struct in6_addr *addr, int ifindex)
2892 {
2893         int ret;
2894
2895         ASSERT_RTNL();
2896
2897         lock_sock(sk);
2898         if (join)
2899                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2900         else
2901                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2902         release_sock(sk);
2903
2904         return ret;
2905 }
2906
2907 /*
2908  *      Manual configuration of address on an interface
2909  */
2910 static int inet6_addr_add(struct net *net, int ifindex,
2911                           struct ifa6_config *cfg,
2912                           struct netlink_ext_ack *extack)
2913 {
2914         struct inet6_ifaddr *ifp;
2915         struct inet6_dev *idev;
2916         struct net_device *dev;
2917         unsigned long timeout;
2918         clock_t expires;
2919         u32 flags;
2920
2921         ASSERT_RTNL();
2922
2923         if (cfg->plen > 128)
2924                 return -EINVAL;
2925
2926         /* check the lifetime */
2927         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2928                 return -EINVAL;
2929
2930         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2931                 return -EINVAL;
2932
2933         dev = __dev_get_by_index(net, ifindex);
2934         if (!dev)
2935                 return -ENODEV;
2936
2937         idev = addrconf_add_dev(dev);
2938         if (IS_ERR(idev))
2939                 return PTR_ERR(idev);
2940
2941         if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2942                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2943                                          true, cfg->pfx, ifindex);
2944
2945                 if (ret < 0)
2946                         return ret;
2947         }
2948
2949         cfg->scope = ipv6_addr_scope(cfg->pfx);
2950
2951         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2952         if (addrconf_finite_timeout(timeout)) {
2953                 expires = jiffies_to_clock_t(timeout * HZ);
2954                 cfg->valid_lft = timeout;
2955                 flags = RTF_EXPIRES;
2956         } else {
2957                 expires = 0;
2958                 flags = 0;
2959                 cfg->ifa_flags |= IFA_F_PERMANENT;
2960         }
2961
2962         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2963         if (addrconf_finite_timeout(timeout)) {
2964                 if (timeout == 0)
2965                         cfg->ifa_flags |= IFA_F_DEPRECATED;
2966                 cfg->preferred_lft = timeout;
2967         }
2968
2969         ifp = ipv6_add_addr(idev, cfg, true, extack);
2970         if (!IS_ERR(ifp)) {
2971                 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2972                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2973                                               ifp->rt_priority, dev, expires,
2974                                               flags, GFP_KERNEL);
2975                 }
2976
2977                 /* Send a netlink notification if DAD is enabled and
2978                  * optimistic flag is not set
2979                  */
2980                 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2981                         ipv6_ifa_notify(0, ifp);
2982                 /*
2983                  * Note that section 3.1 of RFC 4429 indicates
2984                  * that the Optimistic flag should not be set for
2985                  * manually configured addresses
2986                  */
2987                 addrconf_dad_start(ifp);
2988                 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2989                         manage_tempaddrs(idev, ifp, cfg->valid_lft,
2990                                          cfg->preferred_lft, true, jiffies);
2991                 in6_ifa_put(ifp);
2992                 addrconf_verify_rtnl(net);
2993                 return 0;
2994         } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2995                 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2996                                cfg->pfx, ifindex);
2997         }
2998
2999         return PTR_ERR(ifp);
3000 }
3001
3002 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3003                           const struct in6_addr *pfx, unsigned int plen)
3004 {
3005         struct inet6_ifaddr *ifp;
3006         struct inet6_dev *idev;
3007         struct net_device *dev;
3008
3009         if (plen > 128)
3010                 return -EINVAL;
3011
3012         dev = __dev_get_by_index(net, ifindex);
3013         if (!dev)
3014                 return -ENODEV;
3015
3016         idev = __in6_dev_get(dev);
3017         if (!idev)
3018                 return -ENXIO;
3019
3020         read_lock_bh(&idev->lock);
3021         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3022                 if (ifp->prefix_len == plen &&
3023                     ipv6_addr_equal(pfx, &ifp->addr)) {
3024                         in6_ifa_hold(ifp);
3025                         read_unlock_bh(&idev->lock);
3026
3027                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
3028                             (ifa_flags & IFA_F_MANAGETEMPADDR))
3029                                 manage_tempaddrs(idev, ifp, 0, 0, false,
3030                                                  jiffies);
3031                         ipv6_del_addr(ifp);
3032                         addrconf_verify_rtnl(net);
3033                         if (ipv6_addr_is_multicast(pfx)) {
3034                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3035                                                false, pfx, dev->ifindex);
3036                         }
3037                         return 0;
3038                 }
3039         }
3040         read_unlock_bh(&idev->lock);
3041         return -EADDRNOTAVAIL;
3042 }
3043
3044
3045 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3046 {
3047         struct ifa6_config cfg = {
3048                 .ifa_flags = IFA_F_PERMANENT,
3049                 .preferred_lft = INFINITY_LIFE_TIME,
3050                 .valid_lft = INFINITY_LIFE_TIME,
3051         };
3052         struct in6_ifreq ireq;
3053         int err;
3054
3055         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3056                 return -EPERM;
3057
3058         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3059                 return -EFAULT;
3060
3061         cfg.pfx = &ireq.ifr6_addr;
3062         cfg.plen = ireq.ifr6_prefixlen;
3063
3064         rtnl_lock();
3065         err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3066         rtnl_unlock();
3067         return err;
3068 }
3069
3070 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3071 {
3072         struct in6_ifreq ireq;
3073         int err;
3074
3075         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3076                 return -EPERM;
3077
3078         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3079                 return -EFAULT;
3080
3081         rtnl_lock();
3082         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3083                              ireq.ifr6_prefixlen);
3084         rtnl_unlock();
3085         return err;
3086 }
3087
3088 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3089                      int plen, int scope, u8 proto)
3090 {
3091         struct inet6_ifaddr *ifp;
3092         struct ifa6_config cfg = {
3093                 .pfx = addr,
3094                 .plen = plen,
3095                 .ifa_flags = IFA_F_PERMANENT,
3096                 .valid_lft = INFINITY_LIFE_TIME,
3097                 .preferred_lft = INFINITY_LIFE_TIME,
3098                 .scope = scope,
3099                 .ifa_proto = proto
3100         };
3101
3102         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3103         if (!IS_ERR(ifp)) {
3104                 spin_lock_bh(&ifp->lock);
3105                 ifp->flags &= ~IFA_F_TENTATIVE;
3106                 spin_unlock_bh(&ifp->lock);
3107                 rt_genid_bump_ipv6(dev_net(idev->dev));
3108                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3109                 in6_ifa_put(ifp);
3110         }
3111 }
3112
3113 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3114 static void add_v4_addrs(struct inet6_dev *idev)
3115 {
3116         struct in6_addr addr;
3117         struct net_device *dev;
3118         struct net *net = dev_net(idev->dev);
3119         int scope, plen, offset = 0;
3120         u32 pflags = 0;
3121
3122         ASSERT_RTNL();
3123
3124         memset(&addr, 0, sizeof(struct in6_addr));
3125         /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3126         if (idev->dev->addr_len == sizeof(struct in6_addr))
3127                 offset = sizeof(struct in6_addr) - 4;
3128         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3129
3130         if (idev->dev->flags&IFF_POINTOPOINT) {
3131                 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3132                         return;
3133
3134                 addr.s6_addr32[0] = htonl(0xfe800000);
3135                 scope = IFA_LINK;
3136                 plen = 64;
3137         } else {
3138                 scope = IPV6_ADDR_COMPATv4;
3139                 plen = 96;
3140                 pflags |= RTF_NONEXTHOP;
3141         }
3142
3143         if (addr.s6_addr32[3]) {
3144                 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3145                 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3146                                       GFP_KERNEL);
3147                 return;
3148         }
3149
3150         for_each_netdev(net, dev) {
3151                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3152                 if (in_dev && (dev->flags & IFF_UP)) {
3153                         struct in_ifaddr *ifa;
3154                         int flag = scope;
3155
3156                         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3157                                 addr.s6_addr32[3] = ifa->ifa_local;
3158
3159                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3160                                         continue;
3161                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3162                                         if (idev->dev->flags&IFF_POINTOPOINT)
3163                                                 continue;
3164                                         flag |= IFA_HOST;
3165                                 }
3166
3167                                 add_addr(idev, &addr, plen, flag,
3168                                          IFAPROT_UNSPEC);
3169                                 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3170                                                       0, pflags, GFP_KERNEL);
3171                         }
3172                 }
3173         }
3174 }
3175 #endif
3176
3177 static void init_loopback(struct net_device *dev)
3178 {
3179         struct inet6_dev  *idev;
3180
3181         /* ::1 */
3182
3183         ASSERT_RTNL();
3184
3185         idev = ipv6_find_idev(dev);
3186         if (IS_ERR(idev)) {
3187                 pr_debug("%s: add_dev failed\n", __func__);
3188                 return;
3189         }
3190
3191         add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3192 }
3193
3194 void addrconf_add_linklocal(struct inet6_dev *idev,
3195                             const struct in6_addr *addr, u32 flags)
3196 {
3197         struct ifa6_config cfg = {
3198                 .pfx = addr,
3199                 .plen = 64,
3200                 .ifa_flags = flags | IFA_F_PERMANENT,
3201                 .valid_lft = INFINITY_LIFE_TIME,
3202                 .preferred_lft = INFINITY_LIFE_TIME,
3203                 .scope = IFA_LINK,
3204                 .ifa_proto = IFAPROT_KERNEL_LL
3205         };
3206         struct inet6_ifaddr *ifp;
3207
3208 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3209         if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3210              idev->cnf.optimistic_dad) &&
3211             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3212                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3213 #endif
3214
3215         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3216         if (!IS_ERR(ifp)) {
3217                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3218                                       0, 0, GFP_ATOMIC);
3219                 addrconf_dad_start(ifp);
3220                 in6_ifa_put(ifp);
3221         }
3222 }
3223 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3224
3225 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3226 {
3227         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3228                 return true;
3229
3230         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3231             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3232                 return true;
3233
3234         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3235             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3236                 return true;
3237
3238         return false;
3239 }
3240
3241 static int ipv6_generate_stable_address(struct in6_addr *address,
3242                                         u8 dad_count,
3243                                         const struct inet6_dev *idev)
3244 {
3245         static DEFINE_SPINLOCK(lock);
3246         static __u32 digest[SHA1_DIGEST_WORDS];
3247         static __u32 workspace[SHA1_WORKSPACE_WORDS];
3248
3249         static union {
3250                 char __data[SHA1_BLOCK_SIZE];
3251                 struct {
3252                         struct in6_addr secret;
3253                         __be32 prefix[2];
3254                         unsigned char hwaddr[MAX_ADDR_LEN];
3255                         u8 dad_count;
3256                 } __packed;
3257         } data;
3258
3259         struct in6_addr secret;
3260         struct in6_addr temp;
3261         struct net *net = dev_net(idev->dev);
3262
3263         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3264
3265         if (idev->cnf.stable_secret.initialized)
3266                 secret = idev->cnf.stable_secret.secret;
3267         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3268                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3269         else
3270                 return -1;
3271
3272 retry:
3273         spin_lock_bh(&lock);
3274
3275         sha1_init(digest);
3276         memset(&data, 0, sizeof(data));
3277         memset(workspace, 0, sizeof(workspace));
3278         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3279         data.prefix[0] = address->s6_addr32[0];
3280         data.prefix[1] = address->s6_addr32[1];
3281         data.secret = secret;
3282         data.dad_count = dad_count;
3283
3284         sha1_transform(digest, data.__data, workspace);
3285
3286         temp = *address;
3287         temp.s6_addr32[2] = (__force __be32)digest[0];
3288         temp.s6_addr32[3] = (__force __be32)digest[1];
3289
3290         spin_unlock_bh(&lock);
3291
3292         if (ipv6_reserved_interfaceid(temp)) {
3293                 dad_count++;
3294                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3295                         return -1;
3296                 goto retry;
3297         }
3298
3299         *address = temp;
3300         return 0;
3301 }
3302
3303 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3304 {
3305         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3306
3307         if (s->initialized)
3308                 return;
3309         s = &idev->cnf.stable_secret;
3310         get_random_bytes(&s->secret, sizeof(s->secret));
3311         s->initialized = true;
3312 }
3313
3314 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3315 {
3316         struct in6_addr addr;
3317
3318         /* no link local addresses on L3 master devices */
3319         if (netif_is_l3_master(idev->dev))
3320                 return;
3321
3322         /* no link local addresses on devices flagged as slaves */
3323         if (idev->dev->flags & IFF_SLAVE)
3324                 return;
3325
3326         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3327
3328         switch (idev->cnf.addr_gen_mode) {
3329         case IN6_ADDR_GEN_MODE_RANDOM:
3330                 ipv6_gen_mode_random_init(idev);
3331                 fallthrough;
3332         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3333                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3334                         addrconf_add_linklocal(idev, &addr,
3335                                                IFA_F_STABLE_PRIVACY);
3336                 else if (prefix_route)
3337                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3338                                               0, 0, GFP_KERNEL);
3339                 break;
3340         case IN6_ADDR_GEN_MODE_EUI64:
3341                 /* addrconf_add_linklocal also adds a prefix_route and we
3342                  * only need to care about prefix routes if ipv6_generate_eui64
3343                  * couldn't generate one.
3344                  */
3345                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3346                         addrconf_add_linklocal(idev, &addr, 0);
3347                 else if (prefix_route)
3348                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3349                                               0, 0, GFP_KERNEL);
3350                 break;
3351         case IN6_ADDR_GEN_MODE_NONE:
3352         default:
3353                 /* will not add any link local address */
3354                 break;
3355         }
3356 }
3357
3358 static void addrconf_dev_config(struct net_device *dev)
3359 {
3360         struct inet6_dev *idev;
3361
3362         ASSERT_RTNL();
3363
3364         if ((dev->type != ARPHRD_ETHER) &&
3365             (dev->type != ARPHRD_FDDI) &&
3366             (dev->type != ARPHRD_ARCNET) &&
3367             (dev->type != ARPHRD_INFINIBAND) &&
3368             (dev->type != ARPHRD_IEEE1394) &&
3369             (dev->type != ARPHRD_TUNNEL6) &&
3370             (dev->type != ARPHRD_6LOWPAN) &&
3371             (dev->type != ARPHRD_TUNNEL) &&
3372             (dev->type != ARPHRD_NONE) &&
3373             (dev->type != ARPHRD_RAWIP)) {
3374                 /* Alas, we support only Ethernet autoconfiguration. */
3375                 idev = __in6_dev_get(dev);
3376                 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3377                     dev->flags & IFF_MULTICAST)
3378                         ipv6_mc_up(idev);
3379                 return;
3380         }
3381
3382         idev = addrconf_add_dev(dev);
3383         if (IS_ERR(idev))
3384                 return;
3385
3386         /* this device type has no EUI support */
3387         if (dev->type == ARPHRD_NONE &&
3388             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3389                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3390
3391         addrconf_addr_gen(idev, false);
3392 }
3393
3394 #if IS_ENABLED(CONFIG_IPV6_SIT)
3395 static void addrconf_sit_config(struct net_device *dev)
3396 {
3397         struct inet6_dev *idev;
3398
3399         ASSERT_RTNL();
3400
3401         /*
3402          * Configure the tunnel with one of our IPv4
3403          * addresses... we should configure all of
3404          * our v4 addrs in the tunnel
3405          */
3406
3407         idev = ipv6_find_idev(dev);
3408         if (IS_ERR(idev)) {
3409                 pr_debug("%s: add_dev failed\n", __func__);
3410                 return;
3411         }
3412
3413         if (dev->priv_flags & IFF_ISATAP) {
3414                 addrconf_addr_gen(idev, false);
3415                 return;
3416         }
3417
3418         add_v4_addrs(idev);
3419
3420         if (dev->flags&IFF_POINTOPOINT)
3421                 addrconf_add_mroute(dev);
3422 }
3423 #endif
3424
3425 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3426 static void addrconf_gre_config(struct net_device *dev)
3427 {
3428         struct inet6_dev *idev;
3429
3430         ASSERT_RTNL();
3431
3432         idev = ipv6_find_idev(dev);
3433         if (IS_ERR(idev)) {
3434                 pr_debug("%s: add_dev failed\n", __func__);
3435                 return;
3436         }
3437
3438         if (dev->type == ARPHRD_ETHER) {
3439                 addrconf_addr_gen(idev, true);
3440                 return;
3441         }
3442
3443         add_v4_addrs(idev);
3444
3445         if (dev->flags & IFF_POINTOPOINT)
3446                 addrconf_add_mroute(dev);
3447 }
3448 #endif
3449
3450 static int fixup_permanent_addr(struct net *net,
3451                                 struct inet6_dev *idev,
3452                                 struct inet6_ifaddr *ifp)
3453 {
3454         /* !fib6_node means the host route was removed from the
3455          * FIB, for example, if 'lo' device is taken down. In that
3456          * case regenerate the host route.
3457          */
3458         if (!ifp->rt || !ifp->rt->fib6_node) {
3459                 struct fib6_info *f6i, *prev;
3460
3461                 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3462                                          GFP_ATOMIC);
3463                 if (IS_ERR(f6i))
3464                         return PTR_ERR(f6i);
3465
3466                 /* ifp->rt can be accessed outside of rtnl */
3467                 spin_lock(&ifp->lock);
3468                 prev = ifp->rt;
3469                 ifp->rt = f6i;
3470                 spin_unlock(&ifp->lock);
3471
3472                 fib6_info_release(prev);
3473         }
3474
3475         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3476                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3477                                       ifp->rt_priority, idev->dev, 0, 0,
3478                                       GFP_ATOMIC);
3479         }
3480
3481         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3482                 addrconf_dad_start(ifp);
3483
3484         return 0;
3485 }
3486
3487 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3488 {
3489         struct inet6_ifaddr *ifp, *tmp;
3490         struct inet6_dev *idev;
3491
3492         idev = __in6_dev_get(dev);
3493         if (!idev)
3494                 return;
3495
3496         write_lock_bh(&idev->lock);
3497
3498         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3499                 if ((ifp->flags & IFA_F_PERMANENT) &&
3500                     fixup_permanent_addr(net, idev, ifp) < 0) {
3501                         write_unlock_bh(&idev->lock);
3502                         in6_ifa_hold(ifp);
3503                         ipv6_del_addr(ifp);
3504                         write_lock_bh(&idev->lock);
3505
3506                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3507                                              idev->dev->name, &ifp->addr);
3508                 }
3509         }
3510
3511         write_unlock_bh(&idev->lock);
3512 }
3513
3514 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3515                            void *ptr)
3516 {
3517         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3518         struct netdev_notifier_change_info *change_info;
3519         struct netdev_notifier_changeupper_info *info;
3520         struct inet6_dev *idev = __in6_dev_get(dev);
3521         struct net *net = dev_net(dev);
3522         int run_pending = 0;
3523         int err;
3524
3525         switch (event) {
3526         case NETDEV_REGISTER:
3527                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3528                         idev = ipv6_add_dev(dev);
3529                         if (IS_ERR(idev))
3530                                 return notifier_from_errno(PTR_ERR(idev));
3531                 }
3532                 break;
3533
3534         case NETDEV_CHANGEMTU:
3535                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3536                 if (dev->mtu < IPV6_MIN_MTU) {
3537                         addrconf_ifdown(dev, dev != net->loopback_dev);
3538                         break;
3539                 }
3540
3541                 if (idev) {
3542                         rt6_mtu_change(dev, dev->mtu);
3543                         idev->cnf.mtu6 = dev->mtu;
3544                         break;
3545                 }
3546
3547                 /* allocate new idev */
3548                 idev = ipv6_add_dev(dev);
3549                 if (IS_ERR(idev))
3550                         break;
3551
3552                 /* device is still not ready */
3553                 if (!(idev->if_flags & IF_READY))
3554                         break;
3555
3556                 run_pending = 1;
3557                 fallthrough;
3558         case NETDEV_UP:
3559         case NETDEV_CHANGE:
3560                 if (dev->flags & IFF_SLAVE)
3561                         break;
3562
3563                 if (idev && idev->cnf.disable_ipv6)
3564                         break;
3565
3566                 if (event == NETDEV_UP) {
3567                         /* restore routes for permanent addresses */
3568                         addrconf_permanent_addr(net, dev);
3569
3570                         if (!addrconf_link_ready(dev)) {
3571                                 /* device is not ready yet. */
3572                                 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3573                                          dev->name);
3574                                 break;
3575                         }
3576
3577                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3578                                 idev = ipv6_add_dev(dev);
3579
3580                         if (!IS_ERR_OR_NULL(idev)) {
3581                                 idev->if_flags |= IF_READY;
3582                                 run_pending = 1;
3583                         }
3584                 } else if (event == NETDEV_CHANGE) {
3585                         if (!addrconf_link_ready(dev)) {
3586                                 /* device is still not ready. */
3587                                 rt6_sync_down_dev(dev, event);
3588                                 break;
3589                         }
3590
3591                         if (!IS_ERR_OR_NULL(idev)) {
3592                                 if (idev->if_flags & IF_READY) {
3593                                         /* device is already configured -
3594                                          * but resend MLD reports, we might
3595                                          * have roamed and need to update
3596                                          * multicast snooping switches
3597                                          */
3598                                         ipv6_mc_up(idev);
3599                                         change_info = ptr;
3600                                         if (change_info->flags_changed & IFF_NOARP)
3601                                                 addrconf_dad_run(idev, true);
3602                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
3603                                         break;
3604                                 }
3605                                 idev->if_flags |= IF_READY;
3606                         }
3607
3608                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3609                                 dev->name);
3610
3611                         run_pending = 1;
3612                 }
3613
3614                 switch (dev->type) {
3615 #if IS_ENABLED(CONFIG_IPV6_SIT)
3616                 case ARPHRD_SIT:
3617                         addrconf_sit_config(dev);
3618                         break;
3619 #endif
3620 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3621                 case ARPHRD_IP6GRE:
3622                 case ARPHRD_IPGRE:
3623                         addrconf_gre_config(dev);
3624                         break;
3625 #endif
3626                 case ARPHRD_LOOPBACK:
3627                         init_loopback(dev);
3628                         break;
3629
3630                 default:
3631                         addrconf_dev_config(dev);
3632                         break;
3633                 }
3634
3635                 if (!IS_ERR_OR_NULL(idev)) {
3636                         if (run_pending)
3637                                 addrconf_dad_run(idev, false);
3638
3639                         /* Device has an address by now */
3640                         rt6_sync_up(dev, RTNH_F_DEAD);
3641
3642                         /*
3643                          * If the MTU changed during the interface down,
3644                          * when the interface up, the changed MTU must be
3645                          * reflected in the idev as well as routers.
3646                          */
3647                         if (idev->cnf.mtu6 != dev->mtu &&
3648                             dev->mtu >= IPV6_MIN_MTU) {
3649                                 rt6_mtu_change(dev, dev->mtu);
3650                                 idev->cnf.mtu6 = dev->mtu;
3651                         }
3652                         idev->tstamp = jiffies;
3653                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3654
3655                         /*
3656                          * If the changed mtu during down is lower than
3657                          * IPV6_MIN_MTU stop IPv6 on this interface.
3658                          */
3659                         if (dev->mtu < IPV6_MIN_MTU)
3660                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3661                 }
3662                 break;
3663
3664         case NETDEV_DOWN:
3665         case NETDEV_UNREGISTER:
3666                 /*
3667                  *      Remove all addresses from this interface.
3668                  */
3669                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3670                 break;
3671
3672         case NETDEV_CHANGENAME:
3673                 if (idev) {
3674                         snmp6_unregister_dev(idev);
3675                         addrconf_sysctl_unregister(idev);
3676                         err = addrconf_sysctl_register(idev);
3677                         if (err)
3678                                 return notifier_from_errno(err);
3679                         err = snmp6_register_dev(idev);
3680                         if (err) {
3681                                 addrconf_sysctl_unregister(idev);
3682                                 return notifier_from_errno(err);
3683                         }
3684                 }
3685                 break;
3686
3687         case NETDEV_PRE_TYPE_CHANGE:
3688         case NETDEV_POST_TYPE_CHANGE:
3689                 if (idev)
3690                         addrconf_type_change(dev, event);
3691                 break;
3692
3693         case NETDEV_CHANGEUPPER:
3694                 info = ptr;
3695
3696                 /* flush all routes if dev is linked to or unlinked from
3697                  * an L3 master device (e.g., VRF)
3698                  */
3699                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3700                         addrconf_ifdown(dev, false);
3701         }
3702
3703         return NOTIFY_OK;
3704 }
3705
3706 /*
3707  *      addrconf module should be notified of a device going up
3708  */
3709 static struct notifier_block ipv6_dev_notf = {
3710         .notifier_call = addrconf_notify,
3711         .priority = ADDRCONF_NOTIFY_PRIORITY,
3712 };
3713
3714 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3715 {
3716         struct inet6_dev *idev;
3717         ASSERT_RTNL();
3718
3719         idev = __in6_dev_get(dev);
3720
3721         if (event == NETDEV_POST_TYPE_CHANGE)
3722                 ipv6_mc_remap(idev);
3723         else if (event == NETDEV_PRE_TYPE_CHANGE)
3724                 ipv6_mc_unmap(idev);
3725 }
3726
3727 static bool addr_is_local(const struct in6_addr *addr)
3728 {
3729         return ipv6_addr_type(addr) &
3730                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3731 }
3732
3733 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3734 {
3735         unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3736         struct net *net = dev_net(dev);
3737         struct inet6_dev *idev;
3738         struct inet6_ifaddr *ifa;
3739         LIST_HEAD(tmp_addr_list);
3740         bool keep_addr = false;
3741         bool was_ready;
3742         int state, i;
3743
3744         ASSERT_RTNL();
3745
3746         rt6_disable_ip(dev, event);
3747
3748         idev = __in6_dev_get(dev);
3749         if (!idev)
3750                 return -ENODEV;
3751
3752         /*
3753          * Step 1: remove reference to ipv6 device from parent device.
3754          *         Do not dev_put!
3755          */
3756         if (unregister) {
3757                 idev->dead = 1;
3758
3759                 /* protected by rtnl_lock */
3760                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3761
3762                 /* Step 1.5: remove snmp6 entry */
3763                 snmp6_unregister_dev(idev);
3764
3765         }
3766
3767         /* combine the user config with event to determine if permanent
3768          * addresses are to be removed from address hash table
3769          */
3770         if (!unregister && !idev->cnf.disable_ipv6) {
3771                 /* aggregate the system setting and interface setting */
3772                 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3773
3774                 if (!_keep_addr)
3775                         _keep_addr = idev->cnf.keep_addr_on_down;
3776
3777                 keep_addr = (_keep_addr > 0);
3778         }
3779
3780         /* Step 2: clear hash table */
3781         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3782                 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3783
3784                 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3785 restart:
3786                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3787                         if (ifa->idev == idev) {
3788                                 addrconf_del_dad_work(ifa);
3789                                 /* combined flag + permanent flag decide if
3790                                  * address is retained on a down event
3791                                  */
3792                                 if (!keep_addr ||
3793                                     !(ifa->flags & IFA_F_PERMANENT) ||
3794                                     addr_is_local(&ifa->addr)) {
3795                                         hlist_del_init_rcu(&ifa->addr_lst);
3796                                         goto restart;
3797                                 }
3798                         }
3799                 }
3800                 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3801         }
3802
3803         write_lock_bh(&idev->lock);
3804
3805         addrconf_del_rs_timer(idev);
3806
3807         /* Step 2: clear flags for stateless addrconf, repeated down
3808          *         detection
3809          */
3810         was_ready = idev->if_flags & IF_READY;
3811         if (!unregister)
3812                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3813
3814         /* Step 3: clear tempaddr list */
3815         while (!list_empty(&idev->tempaddr_list)) {
3816                 ifa = list_first_entry(&idev->tempaddr_list,
3817                                        struct inet6_ifaddr, tmp_list);
3818                 list_del(&ifa->tmp_list);
3819                 write_unlock_bh(&idev->lock);
3820                 spin_lock_bh(&ifa->lock);
3821
3822                 if (ifa->ifpub) {
3823                         in6_ifa_put(ifa->ifpub);
3824                         ifa->ifpub = NULL;
3825                 }
3826                 spin_unlock_bh(&ifa->lock);
3827                 in6_ifa_put(ifa);
3828                 write_lock_bh(&idev->lock);
3829         }
3830
3831         list_for_each_entry(ifa, &idev->addr_list, if_list)
3832                 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3833         write_unlock_bh(&idev->lock);
3834
3835         while (!list_empty(&tmp_addr_list)) {
3836                 struct fib6_info *rt = NULL;
3837                 bool keep;
3838
3839                 ifa = list_first_entry(&tmp_addr_list,
3840                                        struct inet6_ifaddr, if_list_aux);
3841                 list_del(&ifa->if_list_aux);
3842
3843                 addrconf_del_dad_work(ifa);
3844
3845                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3846                         !addr_is_local(&ifa->addr);
3847
3848                 spin_lock_bh(&ifa->lock);
3849
3850                 if (keep) {
3851                         /* set state to skip the notifier below */
3852                         state = INET6_IFADDR_STATE_DEAD;
3853                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3854                         if (!(ifa->flags & IFA_F_NODAD))
3855                                 ifa->flags |= IFA_F_TENTATIVE;
3856
3857                         rt = ifa->rt;
3858                         ifa->rt = NULL;
3859                 } else {
3860                         state = ifa->state;
3861                         ifa->state = INET6_IFADDR_STATE_DEAD;
3862                 }
3863
3864                 spin_unlock_bh(&ifa->lock);
3865
3866                 if (rt)
3867                         ip6_del_rt(net, rt, false);
3868
3869                 if (state != INET6_IFADDR_STATE_DEAD) {
3870                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3871                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3872                 } else {
3873                         if (idev->cnf.forwarding)
3874                                 addrconf_leave_anycast(ifa);
3875                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3876                 }
3877
3878                 if (!keep) {
3879                         write_lock_bh(&idev->lock);
3880                         list_del_rcu(&ifa->if_list);
3881                         write_unlock_bh(&idev->lock);
3882                         in6_ifa_put(ifa);
3883                 }
3884         }
3885
3886         /* Step 5: Discard anycast and multicast list */
3887         if (unregister) {
3888                 ipv6_ac_destroy_dev(idev);
3889                 ipv6_mc_destroy_dev(idev);
3890         } else if (was_ready) {
3891                 ipv6_mc_down(idev);
3892         }
3893
3894         idev->tstamp = jiffies;
3895         idev->ra_mtu = 0;
3896
3897         /* Last: Shot the device (if unregistered) */
3898         if (unregister) {
3899                 addrconf_sysctl_unregister(idev);
3900                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3901                 neigh_ifdown(&nd_tbl, dev);
3902                 in6_dev_put(idev);
3903         }
3904         return 0;
3905 }
3906
3907 static void addrconf_rs_timer(struct timer_list *t)
3908 {
3909         struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3910         struct net_device *dev = idev->dev;
3911         struct in6_addr lladdr;
3912
3913         write_lock(&idev->lock);
3914         if (idev->dead || !(idev->if_flags & IF_READY))
3915                 goto out;
3916
3917         if (!ipv6_accept_ra(idev))
3918                 goto out;
3919
3920         /* Announcement received after solicitation was sent */
3921         if (idev->if_flags & IF_RA_RCVD)
3922                 goto out;
3923
3924         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3925                 write_unlock(&idev->lock);
3926                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3927                         ndisc_send_rs(dev, &lladdr,
3928                                       &in6addr_linklocal_allrouters);
3929                 else
3930                         goto put;
3931
3932                 write_lock(&idev->lock);
3933                 idev->rs_interval = rfc3315_s14_backoff_update(
3934                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3935                 /* The wait after the last probe can be shorter */
3936                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3937                                              idev->cnf.rtr_solicits) ?
3938                                       idev->cnf.rtr_solicit_delay :
3939                                       idev->rs_interval);
3940         } else {
3941                 /*
3942                  * Note: we do not support deprecated "all on-link"
3943                  * assumption any longer.
3944                  */
3945                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3946         }
3947
3948 out:
3949         write_unlock(&idev->lock);
3950 put:
3951         in6_dev_put(idev);
3952 }
3953
3954 /*
3955  *      Duplicate Address Detection
3956  */
3957 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3958 {
3959         unsigned long rand_num;
3960         struct inet6_dev *idev = ifp->idev;
3961         u64 nonce;
3962
3963         if (ifp->flags & IFA_F_OPTIMISTIC)
3964                 rand_num = 0;
3965         else
3966                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3967
3968         nonce = 0;
3969         if (idev->cnf.enhanced_dad ||
3970             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3971                 do
3972                         get_random_bytes(&nonce, 6);
3973                 while (nonce == 0);
3974         }
3975         ifp->dad_nonce = nonce;
3976         ifp->dad_probes = idev->cnf.dad_transmits;
3977         addrconf_mod_dad_work(ifp, rand_num);
3978 }
3979
3980 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3981 {
3982         struct inet6_dev *idev = ifp->idev;
3983         struct net_device *dev = idev->dev;
3984         bool bump_id, notify = false;
3985         struct net *net;
3986
3987         addrconf_join_solict(dev, &ifp->addr);
3988
3989         read_lock_bh(&idev->lock);
3990         spin_lock(&ifp->lock);
3991         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3992                 goto out;
3993
3994         net = dev_net(dev);
3995         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3996             (net->ipv6.devconf_all->accept_dad < 1 &&
3997              idev->cnf.accept_dad < 1) ||
3998             !(ifp->flags&IFA_F_TENTATIVE) ||
3999             ifp->flags & IFA_F_NODAD) {
4000                 bool send_na = false;
4001
4002                 if (ifp->flags & IFA_F_TENTATIVE &&
4003                     !(ifp->flags & IFA_F_OPTIMISTIC))
4004                         send_na = true;
4005                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4006                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4007                 spin_unlock(&ifp->lock);
4008                 read_unlock_bh(&idev->lock);
4009
4010                 addrconf_dad_completed(ifp, bump_id, send_na);
4011                 return;
4012         }
4013
4014         if (!(idev->if_flags & IF_READY)) {
4015                 spin_unlock(&ifp->lock);
4016                 read_unlock_bh(&idev->lock);
4017                 /*
4018                  * If the device is not ready:
4019                  * - keep it tentative if it is a permanent address.
4020                  * - otherwise, kill it.
4021                  */
4022                 in6_ifa_hold(ifp);
4023                 addrconf_dad_stop(ifp, 0);
4024                 return;
4025         }
4026
4027         /*
4028          * Optimistic nodes can start receiving
4029          * Frames right away
4030          */
4031         if (ifp->flags & IFA_F_OPTIMISTIC) {
4032                 ip6_ins_rt(net, ifp->rt);
4033                 if (ipv6_use_optimistic_addr(net, idev)) {
4034                         /* Because optimistic nodes can use this address,
4035                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
4036                          */
4037                         notify = true;
4038                 }
4039         }
4040
4041         addrconf_dad_kick(ifp);
4042 out:
4043         spin_unlock(&ifp->lock);
4044         read_unlock_bh(&idev->lock);
4045         if (notify)
4046                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4047 }
4048
4049 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4050 {
4051         bool begin_dad = false;
4052
4053         spin_lock_bh(&ifp->lock);
4054         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4055                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4056                 begin_dad = true;
4057         }
4058         spin_unlock_bh(&ifp->lock);
4059
4060         if (begin_dad)
4061                 addrconf_mod_dad_work(ifp, 0);
4062 }
4063
4064 static void addrconf_dad_work(struct work_struct *w)
4065 {
4066         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4067                                                 struct inet6_ifaddr,
4068                                                 dad_work);
4069         struct inet6_dev *idev = ifp->idev;
4070         bool bump_id, disable_ipv6 = false;
4071         struct in6_addr mcaddr;
4072
4073         enum {
4074                 DAD_PROCESS,
4075                 DAD_BEGIN,
4076                 DAD_ABORT,
4077         } action = DAD_PROCESS;
4078
4079         rtnl_lock();
4080
4081         spin_lock_bh(&ifp->lock);
4082         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4083                 action = DAD_BEGIN;
4084                 ifp->state = INET6_IFADDR_STATE_DAD;
4085         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4086                 action = DAD_ABORT;
4087                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4088
4089                 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4090                      idev->cnf.accept_dad > 1) &&
4091                     !idev->cnf.disable_ipv6 &&
4092                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4093                         struct in6_addr addr;
4094
4095                         addr.s6_addr32[0] = htonl(0xfe800000);
4096                         addr.s6_addr32[1] = 0;
4097
4098                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4099                             ipv6_addr_equal(&ifp->addr, &addr)) {
4100                                 /* DAD failed for link-local based on MAC */
4101                                 idev->cnf.disable_ipv6 = 1;
4102
4103                                 pr_info("%s: IPv6 being disabled!\n",
4104                                         ifp->idev->dev->name);
4105                                 disable_ipv6 = true;
4106                         }
4107                 }
4108         }
4109         spin_unlock_bh(&ifp->lock);
4110
4111         if (action == DAD_BEGIN) {
4112                 addrconf_dad_begin(ifp);
4113                 goto out;
4114         } else if (action == DAD_ABORT) {
4115                 in6_ifa_hold(ifp);
4116                 addrconf_dad_stop(ifp, 1);
4117                 if (disable_ipv6)
4118                         addrconf_ifdown(idev->dev, false);
4119                 goto out;
4120         }
4121
4122         if (!ifp->dad_probes && addrconf_dad_end(ifp))
4123                 goto out;
4124
4125         write_lock_bh(&idev->lock);
4126         if (idev->dead || !(idev->if_flags & IF_READY)) {
4127                 write_unlock_bh(&idev->lock);
4128                 goto out;
4129         }
4130
4131         spin_lock(&ifp->lock);
4132         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4133                 spin_unlock(&ifp->lock);
4134                 write_unlock_bh(&idev->lock);
4135                 goto out;
4136         }
4137
4138         if (ifp->dad_probes == 0) {
4139                 bool send_na = false;
4140
4141                 /*
4142                  * DAD was successful
4143                  */
4144
4145                 if (ifp->flags & IFA_F_TENTATIVE &&
4146                     !(ifp->flags & IFA_F_OPTIMISTIC))
4147                         send_na = true;
4148                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4149                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4150                 spin_unlock(&ifp->lock);
4151                 write_unlock_bh(&idev->lock);
4152
4153                 addrconf_dad_completed(ifp, bump_id, send_na);
4154
4155                 goto out;
4156         }
4157
4158         ifp->dad_probes--;
4159         addrconf_mod_dad_work(ifp,
4160                               max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4161                                   HZ/100));
4162         spin_unlock(&ifp->lock);
4163         write_unlock_bh(&idev->lock);
4164
4165         /* send a neighbour solicitation for our addr */
4166         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4167         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4168                       ifp->dad_nonce);
4169 out:
4170         in6_ifa_put(ifp);
4171         rtnl_unlock();
4172 }
4173
4174 /* ifp->idev must be at least read locked */
4175 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4176 {
4177         struct inet6_ifaddr *ifpiter;
4178         struct inet6_dev *idev = ifp->idev;
4179
4180         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4181                 if (ifpiter->scope > IFA_LINK)
4182                         break;
4183                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4184                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4185                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4186                     IFA_F_PERMANENT)
4187                         return false;
4188         }
4189         return true;
4190 }
4191
4192 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4193                                    bool send_na)
4194 {
4195         struct net_device *dev = ifp->idev->dev;
4196         struct in6_addr lladdr;
4197         bool send_rs, send_mld;
4198
4199         addrconf_del_dad_work(ifp);
4200
4201         /*
4202          *      Configure the address for reception. Now it is valid.
4203          */
4204
4205         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4206
4207         /* If added prefix is link local and we are prepared to process
4208            router advertisements, start sending router solicitations.
4209          */
4210
4211         read_lock_bh(&ifp->idev->lock);
4212         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4213         send_rs = send_mld &&
4214                   ipv6_accept_ra(ifp->idev) &&
4215                   ifp->idev->cnf.rtr_solicits != 0 &&
4216                   (dev->flags & IFF_LOOPBACK) == 0 &&
4217                   (dev->type != ARPHRD_TUNNEL);
4218         read_unlock_bh(&ifp->idev->lock);
4219
4220         /* While dad is in progress mld report's source address is in6_addrany.
4221          * Resend with proper ll now.
4222          */
4223         if (send_mld)
4224                 ipv6_mc_dad_complete(ifp->idev);
4225
4226         /* send unsolicited NA if enabled */
4227         if (send_na &&
4228             (ifp->idev->cnf.ndisc_notify ||
4229              dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4230                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4231                               /*router=*/ !!ifp->idev->cnf.forwarding,
4232                               /*solicited=*/ false, /*override=*/ true,
4233                               /*inc_opt=*/ true);
4234         }
4235
4236         if (send_rs) {
4237                 /*
4238                  *      If a host as already performed a random delay
4239                  *      [...] as part of DAD [...] there is no need
4240                  *      to delay again before sending the first RS
4241                  */
4242                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4243                         return;
4244                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4245
4246                 write_lock_bh(&ifp->idev->lock);
4247                 spin_lock(&ifp->lock);
4248                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4249                         ifp->idev->cnf.rtr_solicit_interval);
4250                 ifp->idev->rs_probes = 1;
4251                 ifp->idev->if_flags |= IF_RS_SENT;
4252                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4253                 spin_unlock(&ifp->lock);
4254                 write_unlock_bh(&ifp->idev->lock);
4255         }
4256
4257         if (bump_id)
4258                 rt_genid_bump_ipv6(dev_net(dev));
4259
4260         /* Make sure that a new temporary address will be created
4261          * before this temporary address becomes deprecated.
4262          */
4263         if (ifp->flags & IFA_F_TEMPORARY)
4264                 addrconf_verify_rtnl(dev_net(dev));
4265 }
4266
4267 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4268 {
4269         struct inet6_ifaddr *ifp;
4270
4271         read_lock_bh(&idev->lock);
4272         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4273                 spin_lock(&ifp->lock);
4274                 if ((ifp->flags & IFA_F_TENTATIVE &&
4275                      ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4276                         if (restart)
4277                                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4278                         addrconf_dad_kick(ifp);
4279                 }
4280                 spin_unlock(&ifp->lock);
4281         }
4282         read_unlock_bh(&idev->lock);
4283 }
4284
4285 #ifdef CONFIG_PROC_FS
4286 struct if6_iter_state {
4287         struct seq_net_private p;
4288         int bucket;
4289         int offset;
4290 };
4291
4292 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4293 {
4294         struct if6_iter_state *state = seq->private;
4295         struct net *net = seq_file_net(seq);
4296         struct inet6_ifaddr *ifa = NULL;
4297         int p = 0;
4298
4299         /* initial bucket if pos is 0 */
4300         if (pos == 0) {
4301                 state->bucket = 0;
4302                 state->offset = 0;
4303         }
4304
4305         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4306                 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4307                                          addr_lst) {
4308                         /* sync with offset */
4309                         if (p < state->offset) {
4310                                 p++;
4311                                 continue;
4312                         }
4313                         return ifa;
4314                 }
4315
4316                 /* prepare for next bucket */
4317                 state->offset = 0;
4318                 p = 0;
4319         }
4320         return NULL;
4321 }
4322
4323 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4324                                          struct inet6_ifaddr *ifa)
4325 {
4326         struct if6_iter_state *state = seq->private;
4327         struct net *net = seq_file_net(seq);
4328
4329         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4330                 state->offset++;
4331                 return ifa;
4332         }
4333
4334         state->offset = 0;
4335         while (++state->bucket < IN6_ADDR_HSIZE) {
4336                 hlist_for_each_entry_rcu(ifa,
4337                                      &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4338                         return ifa;
4339                 }
4340         }
4341
4342         return NULL;
4343 }
4344
4345 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4346         __acquires(rcu)
4347 {
4348         rcu_read_lock();
4349         return if6_get_first(seq, *pos);
4350 }
4351
4352 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4353 {
4354         struct inet6_ifaddr *ifa;
4355
4356         ifa = if6_get_next(seq, v);
4357         ++*pos;
4358         return ifa;
4359 }
4360
4361 static void if6_seq_stop(struct seq_file *seq, void *v)
4362         __releases(rcu)
4363 {
4364         rcu_read_unlock();
4365 }
4366
4367 static int if6_seq_show(struct seq_file *seq, void *v)
4368 {
4369         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4370         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4371                    &ifp->addr,
4372                    ifp->idev->dev->ifindex,
4373                    ifp->prefix_len,
4374                    ifp->scope,
4375                    (u8) ifp->flags,
4376                    ifp->idev->dev->name);
4377         return 0;
4378 }
4379
4380 static const struct seq_operations if6_seq_ops = {
4381         .start  = if6_seq_start,
4382         .next   = if6_seq_next,
4383         .show   = if6_seq_show,
4384         .stop   = if6_seq_stop,
4385 };
4386
4387 static int __net_init if6_proc_net_init(struct net *net)
4388 {
4389         if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4390                         sizeof(struct if6_iter_state)))
4391                 return -ENOMEM;
4392         return 0;
4393 }
4394
4395 static void __net_exit if6_proc_net_exit(struct net *net)
4396 {
4397         remove_proc_entry("if_inet6", net->proc_net);
4398 }
4399
4400 static struct pernet_operations if6_proc_net_ops = {
4401         .init = if6_proc_net_init,
4402         .exit = if6_proc_net_exit,
4403 };
4404
4405 int __init if6_proc_init(void)
4406 {
4407         return register_pernet_subsys(&if6_proc_net_ops);
4408 }
4409
4410 void if6_proc_exit(void)
4411 {
4412         unregister_pernet_subsys(&if6_proc_net_ops);
4413 }
4414 #endif  /* CONFIG_PROC_FS */
4415
4416 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4417 /* Check if address is a home address configured on any interface. */
4418 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4419 {
4420         unsigned int hash = inet6_addr_hash(net, addr);
4421         struct inet6_ifaddr *ifp = NULL;
4422         int ret = 0;
4423
4424         rcu_read_lock();
4425         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4426                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4427                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4428                         ret = 1;
4429                         break;
4430                 }
4431         }
4432         rcu_read_unlock();
4433         return ret;
4434 }
4435 #endif
4436
4437 /* RFC6554 has some algorithm to avoid loops in segment routing by
4438  * checking if the segments contains any of a local interface address.
4439  *
4440  * Quote:
4441  *
4442  * To detect loops in the SRH, a router MUST determine if the SRH
4443  * includes multiple addresses assigned to any interface on that router.
4444  * If such addresses appear more than once and are separated by at least
4445  * one address not assigned to that router.
4446  */
4447 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4448                           unsigned char nsegs)
4449 {
4450         const struct in6_addr *addr;
4451         int i, ret = 0, found = 0;
4452         struct inet6_ifaddr *ifp;
4453         bool separated = false;
4454         unsigned int hash;
4455         bool hash_found;
4456
4457         rcu_read_lock();
4458         for (i = 0; i < nsegs; i++) {
4459                 addr = &segs[i];
4460                 hash = inet6_addr_hash(net, addr);
4461
4462                 hash_found = false;
4463                 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4464
4465                         if (ipv6_addr_equal(&ifp->addr, addr)) {
4466                                 hash_found = true;
4467                                 break;
4468                         }
4469                 }
4470
4471                 if (hash_found) {
4472                         if (found > 1 && separated) {
4473                                 ret = 1;
4474                                 break;
4475                         }
4476
4477                         separated = false;
4478                         found++;
4479                 } else {
4480                         separated = true;
4481                 }
4482         }
4483         rcu_read_unlock();
4484
4485         return ret;
4486 }
4487
4488 /*
4489  *      Periodic address status verification
4490  */
4491
4492 static void addrconf_verify_rtnl(struct net *net)
4493 {
4494         unsigned long now, next, next_sec, next_sched;
4495         struct inet6_ifaddr *ifp;
4496         int i;
4497
4498         ASSERT_RTNL();
4499
4500         rcu_read_lock_bh();
4501         now = jiffies;
4502         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4503
4504         cancel_delayed_work(&net->ipv6.addr_chk_work);
4505
4506         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4507 restart:
4508                 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4509                         unsigned long age;
4510
4511                         /* When setting preferred_lft to a value not zero or
4512                          * infinity, while valid_lft is infinity
4513                          * IFA_F_PERMANENT has a non-infinity life time.
4514                          */
4515                         if ((ifp->flags & IFA_F_PERMANENT) &&
4516                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4517                                 continue;
4518
4519                         spin_lock(&ifp->lock);
4520                         /* We try to batch several events at once. */
4521                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4522
4523                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4524                             age >= ifp->valid_lft) {
4525                                 spin_unlock(&ifp->lock);
4526                                 in6_ifa_hold(ifp);
4527                                 rcu_read_unlock_bh();
4528                                 ipv6_del_addr(ifp);
4529                                 rcu_read_lock_bh();
4530                                 goto restart;
4531                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4532                                 spin_unlock(&ifp->lock);
4533                                 continue;
4534                         } else if (age >= ifp->prefered_lft) {
4535                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4536                                 int deprecate = 0;
4537
4538                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4539                                         deprecate = 1;
4540                                         ifp->flags |= IFA_F_DEPRECATED;
4541                                 }
4542
4543                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4544                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4545                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4546
4547                                 spin_unlock(&ifp->lock);
4548
4549                                 if (deprecate) {
4550                                         in6_ifa_hold(ifp);
4551
4552                                         ipv6_ifa_notify(0, ifp);
4553                                         in6_ifa_put(ifp);
4554                                         goto restart;
4555                                 }
4556                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4557                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4558                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4559                                         ifp->idev->cnf.dad_transmits *
4560                                         max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4561
4562                                 if (age >= ifp->prefered_lft - regen_advance) {
4563                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4564                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4565                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4566                                         if (!ifp->regen_count && ifpub) {
4567                                                 ifp->regen_count++;
4568                                                 in6_ifa_hold(ifp);
4569                                                 in6_ifa_hold(ifpub);
4570                                                 spin_unlock(&ifp->lock);
4571
4572                                                 spin_lock(&ifpub->lock);
4573                                                 ifpub->regen_count = 0;
4574                                                 spin_unlock(&ifpub->lock);
4575                                                 rcu_read_unlock_bh();
4576                                                 ipv6_create_tempaddr(ifpub, true);
4577                                                 in6_ifa_put(ifpub);
4578                                                 in6_ifa_put(ifp);
4579                                                 rcu_read_lock_bh();
4580                                                 goto restart;
4581                                         }
4582                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4583                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4584                                 spin_unlock(&ifp->lock);
4585                         } else {
4586                                 /* ifp->prefered_lft <= ifp->valid_lft */
4587                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4588                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4589                                 spin_unlock(&ifp->lock);
4590                         }
4591                 }
4592         }
4593
4594         next_sec = round_jiffies_up(next);
4595         next_sched = next;
4596
4597         /* If rounded timeout is accurate enough, accept it. */
4598         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4599                 next_sched = next_sec;
4600
4601         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4602         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4603                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4604
4605         pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4606                  now, next, next_sec, next_sched);
4607         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4608         rcu_read_unlock_bh();
4609 }
4610
4611 static void addrconf_verify_work(struct work_struct *w)
4612 {
4613         struct net *net = container_of(to_delayed_work(w), struct net,
4614                                        ipv6.addr_chk_work);
4615
4616         rtnl_lock();
4617         addrconf_verify_rtnl(net);
4618         rtnl_unlock();
4619 }
4620
4621 static void addrconf_verify(struct net *net)
4622 {
4623         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4624 }
4625
4626 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4627                                      struct in6_addr **peer_pfx)
4628 {
4629         struct in6_addr *pfx = NULL;
4630
4631         *peer_pfx = NULL;
4632
4633         if (addr)
4634                 pfx = nla_data(addr);
4635
4636         if (local) {
4637                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4638                         *peer_pfx = pfx;
4639                 pfx = nla_data(local);
4640         }
4641
4642         return pfx;
4643 }
4644
4645 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4646         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4647         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4648         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4649         [IFA_FLAGS]             = { .len = sizeof(u32) },
4650         [IFA_RT_PRIORITY]       = { .len = sizeof(u32) },
4651         [IFA_TARGET_NETNSID]    = { .type = NLA_S32 },
4652         [IFA_PROTO]             = { .type = NLA_U8 },
4653 };
4654
4655 static int
4656 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4657                   struct netlink_ext_ack *extack)
4658 {
4659         struct net *net = sock_net(skb->sk);
4660         struct ifaddrmsg *ifm;
4661         struct nlattr *tb[IFA_MAX+1];
4662         struct in6_addr *pfx, *peer_pfx;
4663         u32 ifa_flags;
4664         int err;
4665
4666         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4667                                      ifa_ipv6_policy, extack);
4668         if (err < 0)
4669                 return err;
4670
4671         ifm = nlmsg_data(nlh);
4672         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4673         if (!pfx)
4674                 return -EINVAL;
4675
4676         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4677
4678         /* We ignore other flags so far. */
4679         ifa_flags &= IFA_F_MANAGETEMPADDR;
4680
4681         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4682                               ifm->ifa_prefixlen);
4683 }
4684
4685 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4686                                unsigned long expires, u32 flags,
4687                                bool modify_peer)
4688 {
4689         struct fib6_info *f6i;
4690         u32 prio;
4691
4692         f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4693                                         ifp->prefix_len,
4694                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
4695         if (!f6i)
4696                 return -ENOENT;
4697
4698         prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4699         if (f6i->fib6_metric != prio) {
4700                 /* delete old one */
4701                 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4702
4703                 /* add new one */
4704                 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4705                                       ifp->prefix_len,
4706                                       ifp->rt_priority, ifp->idev->dev,
4707                                       expires, flags, GFP_KERNEL);
4708         } else {
4709                 if (!expires)
4710                         fib6_clean_expires(f6i);
4711                 else
4712                         fib6_set_expires(f6i, expires);
4713
4714                 fib6_info_release(f6i);
4715         }
4716
4717         return 0;
4718 }
4719
4720 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4721                              struct ifa6_config *cfg)
4722 {
4723         u32 flags;
4724         clock_t expires;
4725         unsigned long timeout;
4726         bool was_managetempaddr;
4727         bool had_prefixroute;
4728         bool new_peer = false;
4729
4730         ASSERT_RTNL();
4731
4732         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4733                 return -EINVAL;
4734
4735         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4736             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4737                 return -EINVAL;
4738
4739         if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4740                 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4741
4742         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4743         if (addrconf_finite_timeout(timeout)) {
4744                 expires = jiffies_to_clock_t(timeout * HZ);
4745                 cfg->valid_lft = timeout;
4746                 flags = RTF_EXPIRES;
4747         } else {
4748                 expires = 0;
4749                 flags = 0;
4750                 cfg->ifa_flags |= IFA_F_PERMANENT;
4751         }
4752
4753         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4754         if (addrconf_finite_timeout(timeout)) {
4755                 if (timeout == 0)
4756                         cfg->ifa_flags |= IFA_F_DEPRECATED;
4757                 cfg->preferred_lft = timeout;
4758         }
4759
4760         if (cfg->peer_pfx &&
4761             memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4762                 if (!ipv6_addr_any(&ifp->peer_addr))
4763                         cleanup_prefix_route(ifp, expires, true, true);
4764                 new_peer = true;
4765         }
4766
4767         spin_lock_bh(&ifp->lock);
4768         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4769         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4770                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4771         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4772                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4773                         IFA_F_NOPREFIXROUTE);
4774         ifp->flags |= cfg->ifa_flags;
4775         ifp->tstamp = jiffies;
4776         ifp->valid_lft = cfg->valid_lft;
4777         ifp->prefered_lft = cfg->preferred_lft;
4778         ifp->ifa_proto = cfg->ifa_proto;
4779
4780         if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4781                 ifp->rt_priority = cfg->rt_priority;
4782
4783         if (new_peer)
4784                 ifp->peer_addr = *cfg->peer_pfx;
4785
4786         spin_unlock_bh(&ifp->lock);
4787         if (!(ifp->flags&IFA_F_TENTATIVE))
4788                 ipv6_ifa_notify(0, ifp);
4789
4790         if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4791                 int rc = -ENOENT;
4792
4793                 if (had_prefixroute)
4794                         rc = modify_prefix_route(ifp, expires, flags, false);
4795
4796                 /* prefix route could have been deleted; if so restore it */
4797                 if (rc == -ENOENT) {
4798                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4799                                               ifp->rt_priority, ifp->idev->dev,
4800                                               expires, flags, GFP_KERNEL);
4801                 }
4802
4803                 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4804                         rc = modify_prefix_route(ifp, expires, flags, true);
4805
4806                 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4807                         addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4808                                               ifp->rt_priority, ifp->idev->dev,
4809                                               expires, flags, GFP_KERNEL);
4810                 }
4811         } else if (had_prefixroute) {
4812                 enum cleanup_prefix_rt_t action;
4813                 unsigned long rt_expires;
4814
4815                 write_lock_bh(&ifp->idev->lock);
4816                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4817                 write_unlock_bh(&ifp->idev->lock);
4818
4819                 if (action != CLEANUP_PREFIX_RT_NOP) {
4820                         cleanup_prefix_route(ifp, rt_expires,
4821                                 action == CLEANUP_PREFIX_RT_DEL, false);
4822                 }
4823         }
4824
4825         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4826                 if (was_managetempaddr &&
4827                     !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4828                         cfg->valid_lft = 0;
4829                         cfg->preferred_lft = 0;
4830                 }
4831                 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4832                                  cfg->preferred_lft, !was_managetempaddr,
4833                                  jiffies);
4834         }
4835
4836         addrconf_verify_rtnl(net);
4837
4838         return 0;
4839 }
4840
4841 static int
4842 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4843                   struct netlink_ext_ack *extack)
4844 {
4845         struct net *net = sock_net(skb->sk);
4846         struct ifaddrmsg *ifm;
4847         struct nlattr *tb[IFA_MAX+1];
4848         struct in6_addr *peer_pfx;
4849         struct inet6_ifaddr *ifa;
4850         struct net_device *dev;
4851         struct inet6_dev *idev;
4852         struct ifa6_config cfg;
4853         int err;
4854
4855         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4856                                      ifa_ipv6_policy, extack);
4857         if (err < 0)
4858                 return err;
4859
4860         memset(&cfg, 0, sizeof(cfg));
4861
4862         ifm = nlmsg_data(nlh);
4863         cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4864         if (!cfg.pfx)
4865                 return -EINVAL;
4866
4867         cfg.peer_pfx = peer_pfx;
4868         cfg.plen = ifm->ifa_prefixlen;
4869         if (tb[IFA_RT_PRIORITY])
4870                 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4871
4872         if (tb[IFA_PROTO])
4873                 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4874
4875         cfg.valid_lft = INFINITY_LIFE_TIME;
4876         cfg.preferred_lft = INFINITY_LIFE_TIME;
4877
4878         if (tb[IFA_CACHEINFO]) {
4879                 struct ifa_cacheinfo *ci;
4880
4881                 ci = nla_data(tb[IFA_CACHEINFO]);
4882                 cfg.valid_lft = ci->ifa_valid;
4883                 cfg.preferred_lft = ci->ifa_prefered;
4884         }
4885
4886         dev =  __dev_get_by_index(net, ifm->ifa_index);
4887         if (!dev)
4888                 return -ENODEV;
4889
4890         if (tb[IFA_FLAGS])
4891                 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4892         else
4893                 cfg.ifa_flags = ifm->ifa_flags;
4894
4895         /* We ignore other flags so far. */
4896         cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4897                          IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4898                          IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4899
4900         idev = ipv6_find_idev(dev);
4901         if (IS_ERR(idev))
4902                 return PTR_ERR(idev);
4903
4904         if (!ipv6_allow_optimistic_dad(net, idev))
4905                 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4906
4907         if (cfg.ifa_flags & IFA_F_NODAD &&
4908             cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4909                 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4910                 return -EINVAL;
4911         }
4912
4913         ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4914         if (!ifa) {
4915                 /*
4916                  * It would be best to check for !NLM_F_CREATE here but
4917                  * userspace already relies on not having to provide this.
4918                  */
4919                 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4920         }
4921
4922         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4923             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4924                 err = -EEXIST;
4925         else
4926                 err = inet6_addr_modify(net, ifa, &cfg);
4927
4928         in6_ifa_put(ifa);
4929
4930         return err;
4931 }
4932
4933 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4934                           u8 scope, int ifindex)
4935 {
4936         struct ifaddrmsg *ifm;
4937
4938         ifm = nlmsg_data(nlh);
4939         ifm->ifa_family = AF_INET6;
4940         ifm->ifa_prefixlen = prefixlen;
4941         ifm->ifa_flags = flags;
4942         ifm->ifa_scope = scope;
4943         ifm->ifa_index = ifindex;
4944 }
4945
4946 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4947                          unsigned long tstamp, u32 preferred, u32 valid)
4948 {
4949         struct ifa_cacheinfo ci;
4950
4951         ci.cstamp = cstamp_delta(cstamp);
4952         ci.tstamp = cstamp_delta(tstamp);
4953         ci.ifa_prefered = preferred;
4954         ci.ifa_valid = valid;
4955
4956         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4957 }
4958
4959 static inline int rt_scope(int ifa_scope)
4960 {
4961         if (ifa_scope & IFA_HOST)
4962                 return RT_SCOPE_HOST;
4963         else if (ifa_scope & IFA_LINK)
4964                 return RT_SCOPE_LINK;
4965         else if (ifa_scope & IFA_SITE)
4966                 return RT_SCOPE_SITE;
4967         else
4968                 return RT_SCOPE_UNIVERSE;
4969 }
4970
4971 static inline int inet6_ifaddr_msgsize(void)
4972 {
4973         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4974                + nla_total_size(16) /* IFA_LOCAL */
4975                + nla_total_size(16) /* IFA_ADDRESS */
4976                + nla_total_size(sizeof(struct ifa_cacheinfo))
4977                + nla_total_size(4)  /* IFA_FLAGS */
4978                + nla_total_size(1)  /* IFA_PROTO */
4979                + nla_total_size(4)  /* IFA_RT_PRIORITY */;
4980 }
4981
4982 enum addr_type_t {
4983         UNICAST_ADDR,
4984         MULTICAST_ADDR,
4985         ANYCAST_ADDR,
4986 };
4987
4988 struct inet6_fill_args {
4989         u32 portid;
4990         u32 seq;
4991         int event;
4992         unsigned int flags;
4993         int netnsid;
4994         int ifindex;
4995         enum addr_type_t type;
4996 };
4997
4998 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4999                              struct inet6_fill_args *args)
5000 {
5001         struct nlmsghdr  *nlh;
5002         u32 preferred, valid;
5003
5004         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5005                         sizeof(struct ifaddrmsg), args->flags);
5006         if (!nlh)
5007                 return -EMSGSIZE;
5008
5009         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5010                       ifa->idev->dev->ifindex);
5011
5012         if (args->netnsid >= 0 &&
5013             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5014                 goto error;
5015
5016         spin_lock_bh(&ifa->lock);
5017         if (!((ifa->flags&IFA_F_PERMANENT) &&
5018               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5019                 preferred = ifa->prefered_lft;
5020                 valid = ifa->valid_lft;
5021                 if (preferred != INFINITY_LIFE_TIME) {
5022                         long tval = (jiffies - ifa->tstamp)/HZ;
5023                         if (preferred > tval)
5024                                 preferred -= tval;
5025                         else
5026                                 preferred = 0;
5027                         if (valid != INFINITY_LIFE_TIME) {
5028                                 if (valid > tval)
5029                                         valid -= tval;
5030                                 else
5031                                         valid = 0;
5032                         }
5033                 }
5034         } else {
5035                 preferred = INFINITY_LIFE_TIME;
5036                 valid = INFINITY_LIFE_TIME;
5037         }
5038         spin_unlock_bh(&ifa->lock);
5039
5040         if (!ipv6_addr_any(&ifa->peer_addr)) {
5041                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5042                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5043                         goto error;
5044         } else
5045                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5046                         goto error;
5047
5048         if (ifa->rt_priority &&
5049             nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5050                 goto error;
5051
5052         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5053                 goto error;
5054
5055         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5056                 goto error;
5057
5058         if (ifa->ifa_proto &&
5059             nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
5060                 goto error;
5061
5062         nlmsg_end(skb, nlh);
5063         return 0;
5064
5065 error:
5066         nlmsg_cancel(skb, nlh);
5067         return -EMSGSIZE;
5068 }
5069
5070 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5071                                struct inet6_fill_args *args)
5072 {
5073         struct nlmsghdr  *nlh;
5074         u8 scope = RT_SCOPE_UNIVERSE;
5075         int ifindex = ifmca->idev->dev->ifindex;
5076
5077         if (ipv6_addr_scope(&ifmca->mca_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_MULTICAST, &ifmca->mca_addr) < 0 ||
5093             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_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 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5104                                struct inet6_fill_args *args)
5105 {
5106         struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5107         int ifindex = dev ? dev->ifindex : 1;
5108         struct nlmsghdr  *nlh;
5109         u8 scope = RT_SCOPE_UNIVERSE;
5110
5111         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5112                 scope = RT_SCOPE_SITE;
5113
5114         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5115                         sizeof(struct ifaddrmsg), args->flags);
5116         if (!nlh)
5117                 return -EMSGSIZE;
5118
5119         if (args->netnsid >= 0 &&
5120             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5121                 nlmsg_cancel(skb, nlh);
5122                 return -EMSGSIZE;
5123         }
5124
5125         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5126         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5127             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5128                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5129                 nlmsg_cancel(skb, nlh);
5130                 return -EMSGSIZE;
5131         }
5132
5133         nlmsg_end(skb, nlh);
5134         return 0;
5135 }
5136
5137 /* called with rcu_read_lock() */
5138 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5139                           struct netlink_callback *cb, int s_ip_idx,
5140                           struct inet6_fill_args *fillargs)
5141 {
5142         struct ifmcaddr6 *ifmca;
5143         struct ifacaddr6 *ifaca;
5144         int ip_idx = 0;
5145         int err = 1;
5146
5147         read_lock_bh(&idev->lock);
5148         switch (fillargs->type) {
5149         case UNICAST_ADDR: {
5150                 struct inet6_ifaddr *ifa;
5151                 fillargs->event = RTM_NEWADDR;
5152
5153                 /* unicast address incl. temp addr */
5154                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5155                         if (ip_idx < s_ip_idx)
5156                                 goto next;
5157                         err = inet6_fill_ifaddr(skb, ifa, fillargs);
5158                         if (err < 0)
5159                                 break;
5160                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5161 next:
5162                         ip_idx++;
5163                 }
5164                 break;
5165         }
5166         case MULTICAST_ADDR:
5167                 read_unlock_bh(&idev->lock);
5168                 fillargs->event = RTM_GETMULTICAST;
5169
5170                 /* multicast address */
5171                 for (ifmca = rtnl_dereference(idev->mc_list);
5172                      ifmca;
5173                      ifmca = rtnl_dereference(ifmca->next), ip_idx++) {
5174                         if (ip_idx < s_ip_idx)
5175                                 continue;
5176                         err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5177                         if (err < 0)
5178                                 break;
5179                 }
5180                 read_lock_bh(&idev->lock);
5181                 break;
5182         case ANYCAST_ADDR:
5183                 fillargs->event = RTM_GETANYCAST;
5184                 /* anycast address */
5185                 for (ifaca = idev->ac_list; ifaca;
5186                      ifaca = ifaca->aca_next, ip_idx++) {
5187                         if (ip_idx < s_ip_idx)
5188                                 continue;
5189                         err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5190                         if (err < 0)
5191                                 break;
5192                 }
5193                 break;
5194         default:
5195                 break;
5196         }
5197         read_unlock_bh(&idev->lock);
5198         cb->args[2] = ip_idx;
5199         return err;
5200 }
5201
5202 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5203                                        struct inet6_fill_args *fillargs,
5204                                        struct net **tgt_net, struct sock *sk,
5205                                        struct netlink_callback *cb)
5206 {
5207         struct netlink_ext_ack *extack = cb->extack;
5208         struct nlattr *tb[IFA_MAX+1];
5209         struct ifaddrmsg *ifm;
5210         int err, i;
5211
5212         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5213                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5214                 return -EINVAL;
5215         }
5216
5217         ifm = nlmsg_data(nlh);
5218         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5219                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5220                 return -EINVAL;
5221         }
5222
5223         fillargs->ifindex = ifm->ifa_index;
5224         if (fillargs->ifindex) {
5225                 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5226                 fillargs->flags |= NLM_F_DUMP_FILTERED;
5227         }
5228
5229         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5230                                             ifa_ipv6_policy, extack);
5231         if (err < 0)
5232                 return err;
5233
5234         for (i = 0; i <= IFA_MAX; ++i) {
5235                 if (!tb[i])
5236                         continue;
5237
5238                 if (i == IFA_TARGET_NETNSID) {
5239                         struct net *net;
5240
5241                         fillargs->netnsid = nla_get_s32(tb[i]);
5242                         net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5243                         if (IS_ERR(net)) {
5244                                 fillargs->netnsid = -1;
5245                                 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5246                                 return PTR_ERR(net);
5247                         }
5248                         *tgt_net = net;
5249                 } else {
5250                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5251                         return -EINVAL;
5252                 }
5253         }
5254
5255         return 0;
5256 }
5257
5258 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5259                            enum addr_type_t type)
5260 {
5261         const struct nlmsghdr *nlh = cb->nlh;
5262         struct inet6_fill_args fillargs = {
5263                 .portid = NETLINK_CB(cb->skb).portid,
5264                 .seq = cb->nlh->nlmsg_seq,
5265                 .flags = NLM_F_MULTI,
5266                 .netnsid = -1,
5267                 .type = type,
5268         };
5269         struct net *tgt_net = sock_net(skb->sk);
5270         int idx, s_idx, s_ip_idx;
5271         int h, s_h;
5272         struct net_device *dev;
5273         struct inet6_dev *idev;
5274         struct hlist_head *head;
5275         int err = 0;
5276
5277         s_h = cb->args[0];
5278         s_idx = idx = cb->args[1];
5279         s_ip_idx = cb->args[2];
5280
5281         if (cb->strict_check) {
5282                 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5283                                                   skb->sk, cb);
5284                 if (err < 0)
5285                         goto put_tgt_net;
5286
5287                 err = 0;
5288                 if (fillargs.ifindex) {
5289                         dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5290                         if (!dev) {
5291                                 err = -ENODEV;
5292                                 goto put_tgt_net;
5293                         }
5294                         idev = __in6_dev_get(dev);
5295                         if (idev) {
5296                                 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5297                                                      &fillargs);
5298                                 if (err > 0)
5299                                         err = 0;
5300                         }
5301                         goto put_tgt_net;
5302                 }
5303         }
5304
5305         rcu_read_lock();
5306         cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5307         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5308                 idx = 0;
5309                 head = &tgt_net->dev_index_head[h];
5310                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5311                         if (idx < s_idx)
5312                                 goto cont;
5313                         if (h > s_h || idx > s_idx)
5314                                 s_ip_idx = 0;
5315                         idev = __in6_dev_get(dev);
5316                         if (!idev)
5317                                 goto cont;
5318
5319                         if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5320                                            &fillargs) < 0)
5321                                 goto done;
5322 cont:
5323                         idx++;
5324                 }
5325         }
5326 done:
5327         rcu_read_unlock();
5328         cb->args[0] = h;
5329         cb->args[1] = idx;
5330 put_tgt_net:
5331         if (fillargs.netnsid >= 0)
5332                 put_net(tgt_net);
5333
5334         return skb->len ? : err;
5335 }
5336
5337 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5338 {
5339         enum addr_type_t type = UNICAST_ADDR;
5340
5341         return inet6_dump_addr(skb, cb, type);
5342 }
5343
5344 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5345 {
5346         enum addr_type_t type = MULTICAST_ADDR;
5347
5348         return inet6_dump_addr(skb, cb, type);
5349 }
5350
5351
5352 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5353 {
5354         enum addr_type_t type = ANYCAST_ADDR;
5355
5356         return inet6_dump_addr(skb, cb, type);
5357 }
5358
5359 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5360                                        const struct nlmsghdr *nlh,
5361                                        struct nlattr **tb,
5362                                        struct netlink_ext_ack *extack)
5363 {
5364         struct ifaddrmsg *ifm;
5365         int i, err;
5366
5367         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5368                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5369                 return -EINVAL;
5370         }
5371
5372         if (!netlink_strict_get_check(skb))
5373                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5374                                               ifa_ipv6_policy, extack);
5375
5376         ifm = nlmsg_data(nlh);
5377         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5378                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5379                 return -EINVAL;
5380         }
5381
5382         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5383                                             ifa_ipv6_policy, extack);
5384         if (err)
5385                 return err;
5386
5387         for (i = 0; i <= IFA_MAX; i++) {
5388                 if (!tb[i])
5389                         continue;
5390
5391                 switch (i) {
5392                 case IFA_TARGET_NETNSID:
5393                 case IFA_ADDRESS:
5394                 case IFA_LOCAL:
5395                         break;
5396                 default:
5397                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5398                         return -EINVAL;
5399                 }
5400         }
5401
5402         return 0;
5403 }
5404
5405 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5406                              struct netlink_ext_ack *extack)
5407 {
5408         struct net *tgt_net = sock_net(in_skb->sk);
5409         struct inet6_fill_args fillargs = {
5410                 .portid = NETLINK_CB(in_skb).portid,
5411                 .seq = nlh->nlmsg_seq,
5412                 .event = RTM_NEWADDR,
5413                 .flags = 0,
5414                 .netnsid = -1,
5415         };
5416         struct ifaddrmsg *ifm;
5417         struct nlattr *tb[IFA_MAX+1];
5418         struct in6_addr *addr = NULL, *peer;
5419         struct net_device *dev = NULL;
5420         struct inet6_ifaddr *ifa;
5421         struct sk_buff *skb;
5422         int err;
5423
5424         err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5425         if (err < 0)
5426                 return err;
5427
5428         if (tb[IFA_TARGET_NETNSID]) {
5429                 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5430
5431                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5432                                                   fillargs.netnsid);
5433                 if (IS_ERR(tgt_net))
5434                         return PTR_ERR(tgt_net);
5435         }
5436
5437         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5438         if (!addr)
5439                 return -EINVAL;
5440
5441         ifm = nlmsg_data(nlh);
5442         if (ifm->ifa_index)
5443                 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5444
5445         ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5446         if (!ifa) {
5447                 err = -EADDRNOTAVAIL;
5448                 goto errout;
5449         }
5450
5451         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5452         if (!skb) {
5453                 err = -ENOBUFS;
5454                 goto errout_ifa;
5455         }
5456
5457         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5458         if (err < 0) {
5459                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5460                 WARN_ON(err == -EMSGSIZE);
5461                 kfree_skb(skb);
5462                 goto errout_ifa;
5463         }
5464         err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5465 errout_ifa:
5466         in6_ifa_put(ifa);
5467 errout:
5468         dev_put(dev);
5469         if (fillargs.netnsid >= 0)
5470                 put_net(tgt_net);
5471
5472         return err;
5473 }
5474
5475 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5476 {
5477         struct sk_buff *skb;
5478         struct net *net = dev_net(ifa->idev->dev);
5479         struct inet6_fill_args fillargs = {
5480                 .portid = 0,
5481                 .seq = 0,
5482                 .event = event,
5483                 .flags = 0,
5484                 .netnsid = -1,
5485         };
5486         int err = -ENOBUFS;
5487
5488         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5489         if (!skb)
5490                 goto errout;
5491
5492         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5493         if (err < 0) {
5494                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5495                 WARN_ON(err == -EMSGSIZE);
5496                 kfree_skb(skb);
5497                 goto errout;
5498         }
5499         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5500         return;
5501 errout:
5502         if (err < 0)
5503                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5504 }
5505
5506 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5507                                 __s32 *array, int bytes)
5508 {
5509         BUG_ON(bytes < (DEVCONF_MAX * 4));
5510
5511         memset(array, 0, bytes);
5512         array[DEVCONF_FORWARDING] = cnf->forwarding;
5513         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5514         array[DEVCONF_MTU6] = cnf->mtu6;
5515         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5516         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5517         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5518         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5519         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5520         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5521                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5522         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5523                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5524         array[DEVCONF_RTR_SOLICIT_DELAY] =
5525                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5526         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5527         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5528                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5529         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5530                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5531         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5532         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5533         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5534         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5535         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5536         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5537         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5538         array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5539         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5540         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5541 #ifdef CONFIG_IPV6_ROUTER_PREF
5542         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5543         array[DEVCONF_RTR_PROBE_INTERVAL] =
5544                 jiffies_to_msecs(cnf->rtr_probe_interval);
5545 #ifdef CONFIG_IPV6_ROUTE_INFO
5546         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5547         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5548 #endif
5549 #endif
5550         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5551         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5552 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5553         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5554         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5555 #endif
5556 #ifdef CONFIG_IPV6_MROUTE
5557         array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5558 #endif
5559         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5560         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5561         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5562         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5563         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5564         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5565         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5566         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5567         /* we omit DEVCONF_STABLE_SECRET for now */
5568         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5569         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5570         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5571         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5572         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5573 #ifdef CONFIG_IPV6_SEG6_HMAC
5574         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5575 #endif
5576         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5577         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5578         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5579         array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5580         array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5581         array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5582         array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5583         array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5584         array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
5585         array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
5586 }
5587
5588 static inline size_t inet6_ifla6_size(void)
5589 {
5590         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5591              + nla_total_size(sizeof(struct ifla_cacheinfo))
5592              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5593              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5594              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5595              + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5596              + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5597              + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5598              + 0;
5599 }
5600
5601 static inline size_t inet6_if_nlmsg_size(void)
5602 {
5603         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5604                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5605                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5606                + nla_total_size(4) /* IFLA_MTU */
5607                + nla_total_size(4) /* IFLA_LINK */
5608                + nla_total_size(1) /* IFLA_OPERSTATE */
5609                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5610 }
5611
5612 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5613                                         int bytes)
5614 {
5615         int i;
5616         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5617         BUG_ON(pad < 0);
5618
5619         /* Use put_unaligned() because stats may not be aligned for u64. */
5620         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5621         for (i = 1; i < ICMP6_MIB_MAX; i++)
5622                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5623
5624         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5625 }
5626
5627 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5628                                         int bytes, size_t syncpoff)
5629 {
5630         int i, c;
5631         u64 buff[IPSTATS_MIB_MAX];
5632         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5633
5634         BUG_ON(pad < 0);
5635
5636         memset(buff, 0, sizeof(buff));
5637         buff[0] = IPSTATS_MIB_MAX;
5638
5639         for_each_possible_cpu(c) {
5640                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5641                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5642         }
5643
5644         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5645         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5646 }
5647
5648 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5649                              int bytes)
5650 {
5651         switch (attrtype) {
5652         case IFLA_INET6_STATS:
5653                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5654                                      offsetof(struct ipstats_mib, syncp));
5655                 break;
5656         case IFLA_INET6_ICMP6STATS:
5657                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5658                 break;
5659         }
5660 }
5661
5662 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5663                                   u32 ext_filter_mask)
5664 {
5665         struct nlattr *nla;
5666         struct ifla_cacheinfo ci;
5667
5668         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5669                 goto nla_put_failure;
5670         ci.max_reasm_len = IPV6_MAXPLEN;
5671         ci.tstamp = cstamp_delta(idev->tstamp);
5672         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5673         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5674         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5675                 goto nla_put_failure;
5676         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5677         if (!nla)
5678                 goto nla_put_failure;
5679         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5680
5681         /* XXX - MC not implemented */
5682
5683         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5684                 return 0;
5685
5686         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5687         if (!nla)
5688                 goto nla_put_failure;
5689         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5690
5691         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5692         if (!nla)
5693                 goto nla_put_failure;
5694         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5695
5696         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5697         if (!nla)
5698                 goto nla_put_failure;
5699         read_lock_bh(&idev->lock);
5700         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5701         read_unlock_bh(&idev->lock);
5702
5703         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5704                 goto nla_put_failure;
5705
5706         if (idev->ra_mtu &&
5707             nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5708                 goto nla_put_failure;
5709
5710         return 0;
5711
5712 nla_put_failure:
5713         return -EMSGSIZE;
5714 }
5715
5716 static size_t inet6_get_link_af_size(const struct net_device *dev,
5717                                      u32 ext_filter_mask)
5718 {
5719         if (!__in6_dev_get(dev))
5720                 return 0;
5721
5722         return inet6_ifla6_size();
5723 }
5724
5725 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5726                               u32 ext_filter_mask)
5727 {
5728         struct inet6_dev *idev = __in6_dev_get(dev);
5729
5730         if (!idev)
5731                 return -ENODATA;
5732
5733         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5734                 return -EMSGSIZE;
5735
5736         return 0;
5737 }
5738
5739 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5740                              struct netlink_ext_ack *extack)
5741 {
5742         struct inet6_ifaddr *ifp;
5743         struct net_device *dev = idev->dev;
5744         bool clear_token, update_rs = false;
5745         struct in6_addr ll_addr;
5746
5747         ASSERT_RTNL();
5748
5749         if (!token)
5750                 return -EINVAL;
5751
5752         if (dev->flags & IFF_LOOPBACK) {
5753                 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5754                 return -EINVAL;
5755         }
5756
5757         if (dev->flags & IFF_NOARP) {
5758                 NL_SET_ERR_MSG_MOD(extack,
5759                                    "Device does not do neighbour discovery");
5760                 return -EINVAL;
5761         }
5762
5763         if (!ipv6_accept_ra(idev)) {
5764                 NL_SET_ERR_MSG_MOD(extack,
5765                                    "Router advertisement is disabled on device");
5766                 return -EINVAL;
5767         }
5768
5769         if (idev->cnf.rtr_solicits == 0) {
5770                 NL_SET_ERR_MSG(extack,
5771                                "Router solicitation is disabled on device");
5772                 return -EINVAL;
5773         }
5774
5775         write_lock_bh(&idev->lock);
5776
5777         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5778         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5779
5780         write_unlock_bh(&idev->lock);
5781
5782         clear_token = ipv6_addr_any(token);
5783         if (clear_token)
5784                 goto update_lft;
5785
5786         if (!idev->dead && (idev->if_flags & IF_READY) &&
5787             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5788                              IFA_F_OPTIMISTIC)) {
5789                 /* If we're not ready, then normal ifup will take care
5790                  * of this. Otherwise, we need to request our rs here.
5791                  */
5792                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5793                 update_rs = true;
5794         }
5795
5796 update_lft:
5797         write_lock_bh(&idev->lock);
5798
5799         if (update_rs) {
5800                 idev->if_flags |= IF_RS_SENT;
5801                 idev->rs_interval = rfc3315_s14_backoff_init(
5802                         idev->cnf.rtr_solicit_interval);
5803                 idev->rs_probes = 1;
5804                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5805         }
5806
5807         /* Well, that's kinda nasty ... */
5808         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5809                 spin_lock(&ifp->lock);
5810                 if (ifp->tokenized) {
5811                         ifp->valid_lft = 0;
5812                         ifp->prefered_lft = 0;
5813                 }
5814                 spin_unlock(&ifp->lock);
5815         }
5816
5817         write_unlock_bh(&idev->lock);
5818         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5819         addrconf_verify_rtnl(dev_net(dev));
5820         return 0;
5821 }
5822
5823 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5824         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5825         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5826         [IFLA_INET6_RA_MTU]             = { .type = NLA_REJECT,
5827                                             .reject_message =
5828                                                 "IFLA_INET6_RA_MTU can not be set" },
5829 };
5830
5831 static int check_addr_gen_mode(int mode)
5832 {
5833         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5834             mode != IN6_ADDR_GEN_MODE_NONE &&
5835             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5836             mode != IN6_ADDR_GEN_MODE_RANDOM)
5837                 return -EINVAL;
5838         return 1;
5839 }
5840
5841 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5842                                 int mode)
5843 {
5844         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5845             !idev->cnf.stable_secret.initialized &&
5846             !net->ipv6.devconf_dflt->stable_secret.initialized)
5847                 return -EINVAL;
5848         return 1;
5849 }
5850
5851 static int inet6_validate_link_af(const struct net_device *dev,
5852                                   const struct nlattr *nla,
5853                                   struct netlink_ext_ack *extack)
5854 {
5855         struct nlattr *tb[IFLA_INET6_MAX + 1];
5856         struct inet6_dev *idev = NULL;
5857         int err;
5858
5859         if (dev) {
5860                 idev = __in6_dev_get(dev);
5861                 if (!idev)
5862                         return -EAFNOSUPPORT;
5863         }
5864
5865         err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5866                                           inet6_af_policy, extack);
5867         if (err)
5868                 return err;
5869
5870         if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5871                 return -EINVAL;
5872
5873         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5874                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5875
5876                 if (check_addr_gen_mode(mode) < 0)
5877                         return -EINVAL;
5878                 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5879                         return -EINVAL;
5880         }
5881
5882         return 0;
5883 }
5884
5885 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5886                              struct netlink_ext_ack *extack)
5887 {
5888         struct inet6_dev *idev = __in6_dev_get(dev);
5889         struct nlattr *tb[IFLA_INET6_MAX + 1];
5890         int err;
5891
5892         if (!idev)
5893                 return -EAFNOSUPPORT;
5894
5895         if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5896                 return -EINVAL;
5897
5898         if (tb[IFLA_INET6_TOKEN]) {
5899                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5900                                         extack);
5901                 if (err)
5902                         return err;
5903         }
5904
5905         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5906                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5907
5908                 idev->cnf.addr_gen_mode = mode;
5909         }
5910
5911         return 0;
5912 }
5913
5914 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5915                              u32 portid, u32 seq, int event, unsigned int flags)
5916 {
5917         struct net_device *dev = idev->dev;
5918         struct ifinfomsg *hdr;
5919         struct nlmsghdr *nlh;
5920         void *protoinfo;
5921
5922         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5923         if (!nlh)
5924                 return -EMSGSIZE;
5925
5926         hdr = nlmsg_data(nlh);
5927         hdr->ifi_family = AF_INET6;
5928         hdr->__ifi_pad = 0;
5929         hdr->ifi_type = dev->type;
5930         hdr->ifi_index = dev->ifindex;
5931         hdr->ifi_flags = dev_get_flags(dev);
5932         hdr->ifi_change = 0;
5933
5934         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5935             (dev->addr_len &&
5936              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5937             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5938             (dev->ifindex != dev_get_iflink(dev) &&
5939              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5940             nla_put_u8(skb, IFLA_OPERSTATE,
5941                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5942                 goto nla_put_failure;
5943         protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5944         if (!protoinfo)
5945                 goto nla_put_failure;
5946
5947         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5948                 goto nla_put_failure;
5949
5950         nla_nest_end(skb, protoinfo);
5951         nlmsg_end(skb, nlh);
5952         return 0;
5953
5954 nla_put_failure:
5955         nlmsg_cancel(skb, nlh);
5956         return -EMSGSIZE;
5957 }
5958
5959 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5960                                    struct netlink_ext_ack *extack)
5961 {
5962         struct ifinfomsg *ifm;
5963
5964         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5965                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5966                 return -EINVAL;
5967         }
5968
5969         if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5970                 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5971                 return -EINVAL;
5972         }
5973
5974         ifm = nlmsg_data(nlh);
5975         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5976             ifm->ifi_change || ifm->ifi_index) {
5977                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5978                 return -EINVAL;
5979         }
5980
5981         return 0;
5982 }
5983
5984 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5985 {
5986         struct net *net = sock_net(skb->sk);
5987         int h, s_h;
5988         int idx = 0, s_idx;
5989         struct net_device *dev;
5990         struct inet6_dev *idev;
5991         struct hlist_head *head;
5992
5993         /* only requests using strict checking can pass data to
5994          * influence the dump
5995          */
5996         if (cb->strict_check) {
5997                 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5998
5999                 if (err < 0)
6000                         return err;
6001         }
6002
6003         s_h = cb->args[0];
6004         s_idx = cb->args[1];
6005
6006         rcu_read_lock();
6007         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6008                 idx = 0;
6009                 head = &net->dev_index_head[h];
6010                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
6011                         if (idx < s_idx)
6012                                 goto cont;
6013                         idev = __in6_dev_get(dev);
6014                         if (!idev)
6015                                 goto cont;
6016                         if (inet6_fill_ifinfo(skb, idev,
6017                                               NETLINK_CB(cb->skb).portid,
6018                                               cb->nlh->nlmsg_seq,
6019                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
6020                                 goto out;
6021 cont:
6022                         idx++;
6023                 }
6024         }
6025 out:
6026         rcu_read_unlock();
6027         cb->args[1] = idx;
6028         cb->args[0] = h;
6029
6030         return skb->len;
6031 }
6032
6033 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6034 {
6035         struct sk_buff *skb;
6036         struct net *net = dev_net(idev->dev);
6037         int err = -ENOBUFS;
6038
6039         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6040         if (!skb)
6041                 goto errout;
6042
6043         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6044         if (err < 0) {
6045                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6046                 WARN_ON(err == -EMSGSIZE);
6047                 kfree_skb(skb);
6048                 goto errout;
6049         }
6050         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6051         return;
6052 errout:
6053         if (err < 0)
6054                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6055 }
6056
6057 static inline size_t inet6_prefix_nlmsg_size(void)
6058 {
6059         return NLMSG_ALIGN(sizeof(struct prefixmsg))
6060                + nla_total_size(sizeof(struct in6_addr))
6061                + nla_total_size(sizeof(struct prefix_cacheinfo));
6062 }
6063
6064 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6065                              struct prefix_info *pinfo, u32 portid, u32 seq,
6066                              int event, unsigned int flags)
6067 {
6068         struct prefixmsg *pmsg;
6069         struct nlmsghdr *nlh;
6070         struct prefix_cacheinfo ci;
6071
6072         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6073         if (!nlh)
6074                 return -EMSGSIZE;
6075
6076         pmsg = nlmsg_data(nlh);
6077         pmsg->prefix_family = AF_INET6;
6078         pmsg->prefix_pad1 = 0;
6079         pmsg->prefix_pad2 = 0;
6080         pmsg->prefix_ifindex = idev->dev->ifindex;
6081         pmsg->prefix_len = pinfo->prefix_len;
6082         pmsg->prefix_type = pinfo->type;
6083         pmsg->prefix_pad3 = 0;
6084         pmsg->prefix_flags = 0;
6085         if (pinfo->onlink)
6086                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6087         if (pinfo->autoconf)
6088                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6089
6090         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6091                 goto nla_put_failure;
6092         ci.preferred_time = ntohl(pinfo->prefered);
6093         ci.valid_time = ntohl(pinfo->valid);
6094         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6095                 goto nla_put_failure;
6096         nlmsg_end(skb, nlh);
6097         return 0;
6098
6099 nla_put_failure:
6100         nlmsg_cancel(skb, nlh);
6101         return -EMSGSIZE;
6102 }
6103
6104 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6105                          struct prefix_info *pinfo)
6106 {
6107         struct sk_buff *skb;
6108         struct net *net = dev_net(idev->dev);
6109         int err = -ENOBUFS;
6110
6111         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6112         if (!skb)
6113                 goto errout;
6114
6115         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6116         if (err < 0) {
6117                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6118                 WARN_ON(err == -EMSGSIZE);
6119                 kfree_skb(skb);
6120                 goto errout;
6121         }
6122         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6123         return;
6124 errout:
6125         if (err < 0)
6126                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6127 }
6128
6129 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6130 {
6131         struct net *net = dev_net(ifp->idev->dev);
6132
6133         if (event)
6134                 ASSERT_RTNL();
6135
6136         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6137
6138         switch (event) {
6139         case RTM_NEWADDR:
6140                 /*
6141                  * If the address was optimistic we inserted the route at the
6142                  * start of our DAD process, so we don't need to do it again.
6143                  * If the device was taken down in the middle of the DAD
6144                  * cycle there is a race where we could get here without a
6145                  * host route, so nothing to insert. That will be fixed when
6146                  * the device is brought up.
6147                  */
6148                 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6149                         ip6_ins_rt(net, ifp->rt);
6150                 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6151                         pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6152                                 &ifp->addr, ifp->idev->dev->name);
6153                 }
6154
6155                 if (ifp->idev->cnf.forwarding)
6156                         addrconf_join_anycast(ifp);
6157                 if (!ipv6_addr_any(&ifp->peer_addr))
6158                         addrconf_prefix_route(&ifp->peer_addr, 128,
6159                                               ifp->rt_priority, ifp->idev->dev,
6160                                               0, 0, GFP_ATOMIC);
6161                 break;
6162         case RTM_DELADDR:
6163                 if (ifp->idev->cnf.forwarding)
6164                         addrconf_leave_anycast(ifp);
6165                 addrconf_leave_solict(ifp->idev, &ifp->addr);
6166                 if (!ipv6_addr_any(&ifp->peer_addr)) {
6167                         struct fib6_info *rt;
6168
6169                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6170                                                        ifp->idev->dev, 0, 0,
6171                                                        false);
6172                         if (rt)
6173                                 ip6_del_rt(net, rt, false);
6174                 }
6175                 if (ifp->rt) {
6176                         ip6_del_rt(net, ifp->rt, false);
6177                         ifp->rt = NULL;
6178                 }
6179                 rt_genid_bump_ipv6(net);
6180                 break;
6181         }
6182         atomic_inc(&net->ipv6.dev_addr_genid);
6183 }
6184
6185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6186 {
6187         if (likely(ifp->idev->dead == 0))
6188                 __ipv6_ifa_notify(event, ifp);
6189 }
6190
6191 #ifdef CONFIG_SYSCTL
6192
6193 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6194                 void *buffer, size_t *lenp, loff_t *ppos)
6195 {
6196         int *valp = ctl->data;
6197         int val = *valp;
6198         loff_t pos = *ppos;
6199         struct ctl_table lctl;
6200         int ret;
6201
6202         /*
6203          * ctl->data points to idev->cnf.forwarding, we should
6204          * not modify it until we get the rtnl lock.
6205          */
6206         lctl = *ctl;
6207         lctl.data = &val;
6208
6209         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6210
6211         if (write)
6212                 ret = addrconf_fixup_forwarding(ctl, valp, val);
6213         if (ret)
6214                 *ppos = pos;
6215         return ret;
6216 }
6217
6218 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6219                 void *buffer, size_t *lenp, loff_t *ppos)
6220 {
6221         struct inet6_dev *idev = ctl->extra1;
6222         int min_mtu = IPV6_MIN_MTU;
6223         struct ctl_table lctl;
6224
6225         lctl = *ctl;
6226         lctl.extra1 = &min_mtu;
6227         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6228
6229         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6230 }
6231
6232 static void dev_disable_change(struct inet6_dev *idev)
6233 {
6234         struct netdev_notifier_info info;
6235
6236         if (!idev || !idev->dev)
6237                 return;
6238
6239         netdev_notifier_info_init(&info, idev->dev);
6240         if (idev->cnf.disable_ipv6)
6241                 addrconf_notify(NULL, NETDEV_DOWN, &info);
6242         else
6243                 addrconf_notify(NULL, NETDEV_UP, &info);
6244 }
6245
6246 static void addrconf_disable_change(struct net *net, __s32 newf)
6247 {
6248         struct net_device *dev;
6249         struct inet6_dev *idev;
6250
6251         for_each_netdev(net, dev) {
6252                 idev = __in6_dev_get(dev);
6253                 if (idev) {
6254                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6255                         idev->cnf.disable_ipv6 = newf;
6256                         if (changed)
6257                                 dev_disable_change(idev);
6258                 }
6259         }
6260 }
6261
6262 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6263 {
6264         struct net *net;
6265         int old;
6266
6267         if (!rtnl_trylock())
6268                 return restart_syscall();
6269
6270         net = (struct net *)table->extra2;
6271         old = *p;
6272         *p = newf;
6273
6274         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6275                 rtnl_unlock();
6276                 return 0;
6277         }
6278
6279         if (p == &net->ipv6.devconf_all->disable_ipv6) {
6280                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6281                 addrconf_disable_change(net, newf);
6282         } else if ((!newf) ^ (!old))
6283                 dev_disable_change((struct inet6_dev *)table->extra1);
6284
6285         rtnl_unlock();
6286         return 0;
6287 }
6288
6289 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6290                 void *buffer, size_t *lenp, loff_t *ppos)
6291 {
6292         int *valp = ctl->data;
6293         int val = *valp;
6294         loff_t pos = *ppos;
6295         struct ctl_table lctl;
6296         int ret;
6297
6298         /*
6299          * ctl->data points to idev->cnf.disable_ipv6, we should
6300          * not modify it until we get the rtnl lock.
6301          */
6302         lctl = *ctl;
6303         lctl.data = &val;
6304
6305         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6306
6307         if (write)
6308                 ret = addrconf_disable_ipv6(ctl, valp, val);
6309         if (ret)
6310                 *ppos = pos;
6311         return ret;
6312 }
6313
6314 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6315                 void *buffer, size_t *lenp, loff_t *ppos)
6316 {
6317         int *valp = ctl->data;
6318         int ret;
6319         int old, new;
6320
6321         old = *valp;
6322         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6323         new = *valp;
6324
6325         if (write && old != new) {
6326                 struct net *net = ctl->extra2;
6327
6328                 if (!rtnl_trylock())
6329                         return restart_syscall();
6330
6331                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6332                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6333                                                      NETCONFA_PROXY_NEIGH,
6334                                                      NETCONFA_IFINDEX_DEFAULT,
6335                                                      net->ipv6.devconf_dflt);
6336                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6337                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6338                                                      NETCONFA_PROXY_NEIGH,
6339                                                      NETCONFA_IFINDEX_ALL,
6340                                                      net->ipv6.devconf_all);
6341                 else {
6342                         struct inet6_dev *idev = ctl->extra1;
6343
6344                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6345                                                      NETCONFA_PROXY_NEIGH,
6346                                                      idev->dev->ifindex,
6347                                                      &idev->cnf);
6348                 }
6349                 rtnl_unlock();
6350         }
6351
6352         return ret;
6353 }
6354
6355 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6356                                          void *buffer, size_t *lenp,
6357                                          loff_t *ppos)
6358 {
6359         int ret = 0;
6360         u32 new_val;
6361         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6362         struct net *net = (struct net *)ctl->extra2;
6363         struct ctl_table tmp = {
6364                 .data = &new_val,
6365                 .maxlen = sizeof(new_val),
6366                 .mode = ctl->mode,
6367         };
6368
6369         if (!rtnl_trylock())
6370                 return restart_syscall();
6371
6372         new_val = *((u32 *)ctl->data);
6373
6374         ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6375         if (ret != 0)
6376                 goto out;
6377
6378         if (write) {
6379                 if (check_addr_gen_mode(new_val) < 0) {
6380                         ret = -EINVAL;
6381                         goto out;
6382                 }
6383
6384                 if (idev) {
6385                         if (check_stable_privacy(idev, net, new_val) < 0) {
6386                                 ret = -EINVAL;
6387                                 goto out;
6388                         }
6389
6390                         if (idev->cnf.addr_gen_mode != new_val) {
6391                                 idev->cnf.addr_gen_mode = new_val;
6392                                 addrconf_dev_config(idev->dev);
6393                         }
6394                 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6395                         struct net_device *dev;
6396
6397                         net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6398                         for_each_netdev(net, dev) {
6399                                 idev = __in6_dev_get(dev);
6400                                 if (idev &&
6401                                     idev->cnf.addr_gen_mode != new_val) {
6402                                         idev->cnf.addr_gen_mode = new_val;
6403                                         addrconf_dev_config(idev->dev);
6404                                 }
6405                         }
6406                 }
6407
6408                 *((u32 *)ctl->data) = new_val;
6409         }
6410
6411 out:
6412         rtnl_unlock();
6413
6414         return ret;
6415 }
6416
6417 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6418                                          void *buffer, size_t *lenp,
6419                                          loff_t *ppos)
6420 {
6421         int err;
6422         struct in6_addr addr;
6423         char str[IPV6_MAX_STRLEN];
6424         struct ctl_table lctl = *ctl;
6425         struct net *net = ctl->extra2;
6426         struct ipv6_stable_secret *secret = ctl->data;
6427
6428         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6429                 return -EIO;
6430
6431         lctl.maxlen = IPV6_MAX_STRLEN;
6432         lctl.data = str;
6433
6434         if (!rtnl_trylock())
6435                 return restart_syscall();
6436
6437         if (!write && !secret->initialized) {
6438                 err = -EIO;
6439                 goto out;
6440         }
6441
6442         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6443         if (err >= sizeof(str)) {
6444                 err = -EIO;
6445                 goto out;
6446         }
6447
6448         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6449         if (err || !write)
6450                 goto out;
6451
6452         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6453                 err = -EIO;
6454                 goto out;
6455         }
6456
6457         secret->initialized = true;
6458         secret->secret = addr;
6459
6460         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6461                 struct net_device *dev;
6462
6463                 for_each_netdev(net, dev) {
6464                         struct inet6_dev *idev = __in6_dev_get(dev);
6465
6466                         if (idev) {
6467                                 idev->cnf.addr_gen_mode =
6468                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6469                         }
6470                 }
6471         } else {
6472                 struct inet6_dev *idev = ctl->extra1;
6473
6474                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6475         }
6476
6477 out:
6478         rtnl_unlock();
6479
6480         return err;
6481 }
6482
6483 static
6484 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6485                                                 int write, void *buffer,
6486                                                 size_t *lenp,
6487                                                 loff_t *ppos)
6488 {
6489         int *valp = ctl->data;
6490         int val = *valp;
6491         loff_t pos = *ppos;
6492         struct ctl_table lctl;
6493         int ret;
6494
6495         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6496          * we should not modify it until we get the rtnl lock.
6497          */
6498         lctl = *ctl;
6499         lctl.data = &val;
6500
6501         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6502
6503         if (write)
6504                 ret = addrconf_fixup_linkdown(ctl, valp, val);
6505         if (ret)
6506                 *ppos = pos;
6507         return ret;
6508 }
6509
6510 static
6511 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6512 {
6513         if (rt) {
6514                 if (action)
6515                         rt->dst.flags |= DST_NOPOLICY;
6516                 else
6517                         rt->dst.flags &= ~DST_NOPOLICY;
6518         }
6519 }
6520
6521 static
6522 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6523 {
6524         struct inet6_ifaddr *ifa;
6525
6526         read_lock_bh(&idev->lock);
6527         list_for_each_entry(ifa, &idev->addr_list, if_list) {
6528                 spin_lock(&ifa->lock);
6529                 if (ifa->rt) {
6530                         /* host routes only use builtin fib6_nh */
6531                         struct fib6_nh *nh = ifa->rt->fib6_nh;
6532                         int cpu;
6533
6534                         rcu_read_lock();
6535                         ifa->rt->dst_nopolicy = val ? true : false;
6536                         if (nh->rt6i_pcpu) {
6537                                 for_each_possible_cpu(cpu) {
6538                                         struct rt6_info **rtp;
6539
6540                                         rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6541                                         addrconf_set_nopolicy(*rtp, val);
6542                                 }
6543                         }
6544                         rcu_read_unlock();
6545                 }
6546                 spin_unlock(&ifa->lock);
6547         }
6548         read_unlock_bh(&idev->lock);
6549 }
6550
6551 static
6552 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6553 {
6554         struct inet6_dev *idev;
6555         struct net *net;
6556
6557         if (!rtnl_trylock())
6558                 return restart_syscall();
6559
6560         *valp = val;
6561
6562         net = (struct net *)ctl->extra2;
6563         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6564                 rtnl_unlock();
6565                 return 0;
6566         }
6567
6568         if (valp == &net->ipv6.devconf_all->disable_policy)  {
6569                 struct net_device *dev;
6570
6571                 for_each_netdev(net, dev) {
6572                         idev = __in6_dev_get(dev);
6573                         if (idev)
6574                                 addrconf_disable_policy_idev(idev, val);
6575                 }
6576         } else {
6577                 idev = (struct inet6_dev *)ctl->extra1;
6578                 addrconf_disable_policy_idev(idev, val);
6579         }
6580
6581         rtnl_unlock();
6582         return 0;
6583 }
6584
6585 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6586                                    void *buffer, size_t *lenp, loff_t *ppos)
6587 {
6588         int *valp = ctl->data;
6589         int val = *valp;
6590         loff_t pos = *ppos;
6591         struct ctl_table lctl;
6592         int ret;
6593
6594         lctl = *ctl;
6595         lctl.data = &val;
6596         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6597
6598         if (write && (*valp != val))
6599                 ret = addrconf_disable_policy(ctl, valp, val);
6600
6601         if (ret)
6602                 *ppos = pos;
6603
6604         return ret;
6605 }
6606
6607 static int minus_one = -1;
6608 static const int two_five_five = 255;
6609 static u32 ioam6_if_id_max = U16_MAX;
6610
6611 static const struct ctl_table addrconf_sysctl[] = {
6612         {
6613                 .procname       = "forwarding",
6614                 .data           = &ipv6_devconf.forwarding,
6615                 .maxlen         = sizeof(int),
6616                 .mode           = 0644,
6617                 .proc_handler   = addrconf_sysctl_forward,
6618         },
6619         {
6620                 .procname       = "hop_limit",
6621                 .data           = &ipv6_devconf.hop_limit,
6622                 .maxlen         = sizeof(int),
6623                 .mode           = 0644,
6624                 .proc_handler   = proc_dointvec_minmax,
6625                 .extra1         = (void *)SYSCTL_ONE,
6626                 .extra2         = (void *)&two_five_five,
6627         },
6628         {
6629                 .procname       = "mtu",
6630                 .data           = &ipv6_devconf.mtu6,
6631                 .maxlen         = sizeof(int),
6632                 .mode           = 0644,
6633                 .proc_handler   = addrconf_sysctl_mtu,
6634         },
6635         {
6636                 .procname       = "accept_ra",
6637                 .data           = &ipv6_devconf.accept_ra,
6638                 .maxlen         = sizeof(int),
6639                 .mode           = 0644,
6640                 .proc_handler   = proc_dointvec,
6641         },
6642         {
6643                 .procname       = "accept_redirects",
6644                 .data           = &ipv6_devconf.accept_redirects,
6645                 .maxlen         = sizeof(int),
6646                 .mode           = 0644,
6647                 .proc_handler   = proc_dointvec,
6648         },
6649         {
6650                 .procname       = "autoconf",
6651                 .data           = &ipv6_devconf.autoconf,
6652                 .maxlen         = sizeof(int),
6653                 .mode           = 0644,
6654                 .proc_handler   = proc_dointvec,
6655         },
6656         {
6657                 .procname       = "dad_transmits",
6658                 .data           = &ipv6_devconf.dad_transmits,
6659                 .maxlen         = sizeof(int),
6660                 .mode           = 0644,
6661                 .proc_handler   = proc_dointvec,
6662         },
6663         {
6664                 .procname       = "router_solicitations",
6665                 .data           = &ipv6_devconf.rtr_solicits,
6666                 .maxlen         = sizeof(int),
6667                 .mode           = 0644,
6668                 .proc_handler   = proc_dointvec_minmax,
6669                 .extra1         = &minus_one,
6670         },
6671         {
6672                 .procname       = "router_solicitation_interval",
6673                 .data           = &ipv6_devconf.rtr_solicit_interval,
6674                 .maxlen         = sizeof(int),
6675                 .mode           = 0644,
6676                 .proc_handler   = proc_dointvec_jiffies,
6677         },
6678         {
6679                 .procname       = "router_solicitation_max_interval",
6680                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6681                 .maxlen         = sizeof(int),
6682                 .mode           = 0644,
6683                 .proc_handler   = proc_dointvec_jiffies,
6684         },
6685         {
6686                 .procname       = "router_solicitation_delay",
6687                 .data           = &ipv6_devconf.rtr_solicit_delay,
6688                 .maxlen         = sizeof(int),
6689                 .mode           = 0644,
6690                 .proc_handler   = proc_dointvec_jiffies,
6691         },
6692         {
6693                 .procname       = "force_mld_version",
6694                 .data           = &ipv6_devconf.force_mld_version,
6695                 .maxlen         = sizeof(int),
6696                 .mode           = 0644,
6697                 .proc_handler   = proc_dointvec,
6698         },
6699         {
6700                 .procname       = "mldv1_unsolicited_report_interval",
6701                 .data           =
6702                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6703                 .maxlen         = sizeof(int),
6704                 .mode           = 0644,
6705                 .proc_handler   = proc_dointvec_ms_jiffies,
6706         },
6707         {
6708                 .procname       = "mldv2_unsolicited_report_interval",
6709                 .data           =
6710                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6711                 .maxlen         = sizeof(int),
6712                 .mode           = 0644,
6713                 .proc_handler   = proc_dointvec_ms_jiffies,
6714         },
6715         {
6716                 .procname       = "use_tempaddr",
6717                 .data           = &ipv6_devconf.use_tempaddr,
6718                 .maxlen         = sizeof(int),
6719                 .mode           = 0644,
6720                 .proc_handler   = proc_dointvec,
6721         },
6722         {
6723                 .procname       = "temp_valid_lft",
6724                 .data           = &ipv6_devconf.temp_valid_lft,
6725                 .maxlen         = sizeof(int),
6726                 .mode           = 0644,
6727                 .proc_handler   = proc_dointvec,
6728         },
6729         {
6730                 .procname       = "temp_prefered_lft",
6731                 .data           = &ipv6_devconf.temp_prefered_lft,
6732                 .maxlen         = sizeof(int),
6733                 .mode           = 0644,
6734                 .proc_handler   = proc_dointvec,
6735         },
6736         {
6737                 .procname       = "regen_max_retry",
6738                 .data           = &ipv6_devconf.regen_max_retry,
6739                 .maxlen         = sizeof(int),
6740                 .mode           = 0644,
6741                 .proc_handler   = proc_dointvec,
6742         },
6743         {
6744                 .procname       = "max_desync_factor",
6745                 .data           = &ipv6_devconf.max_desync_factor,
6746                 .maxlen         = sizeof(int),
6747                 .mode           = 0644,
6748                 .proc_handler   = proc_dointvec,
6749         },
6750         {
6751                 .procname       = "max_addresses",
6752                 .data           = &ipv6_devconf.max_addresses,
6753                 .maxlen         = sizeof(int),
6754                 .mode           = 0644,
6755                 .proc_handler   = proc_dointvec,
6756         },
6757         {
6758                 .procname       = "accept_ra_defrtr",
6759                 .data           = &ipv6_devconf.accept_ra_defrtr,
6760                 .maxlen         = sizeof(int),
6761                 .mode           = 0644,
6762                 .proc_handler   = proc_dointvec,
6763         },
6764         {
6765                 .procname       = "ra_defrtr_metric",
6766                 .data           = &ipv6_devconf.ra_defrtr_metric,
6767                 .maxlen         = sizeof(u32),
6768                 .mode           = 0644,
6769                 .proc_handler   = proc_douintvec_minmax,
6770                 .extra1         = (void *)SYSCTL_ONE,
6771         },
6772         {
6773                 .procname       = "accept_ra_min_hop_limit",
6774                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6775                 .maxlen         = sizeof(int),
6776                 .mode           = 0644,
6777                 .proc_handler   = proc_dointvec,
6778         },
6779         {
6780                 .procname       = "accept_ra_pinfo",
6781                 .data           = &ipv6_devconf.accept_ra_pinfo,
6782                 .maxlen         = sizeof(int),
6783                 .mode           = 0644,
6784                 .proc_handler   = proc_dointvec,
6785         },
6786 #ifdef CONFIG_IPV6_ROUTER_PREF
6787         {
6788                 .procname       = "accept_ra_rtr_pref",
6789                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6790                 .maxlen         = sizeof(int),
6791                 .mode           = 0644,
6792                 .proc_handler   = proc_dointvec,
6793         },
6794         {
6795                 .procname       = "router_probe_interval",
6796                 .data           = &ipv6_devconf.rtr_probe_interval,
6797                 .maxlen         = sizeof(int),
6798                 .mode           = 0644,
6799                 .proc_handler   = proc_dointvec_jiffies,
6800         },
6801 #ifdef CONFIG_IPV6_ROUTE_INFO
6802         {
6803                 .procname       = "accept_ra_rt_info_min_plen",
6804                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6805                 .maxlen         = sizeof(int),
6806                 .mode           = 0644,
6807                 .proc_handler   = proc_dointvec,
6808         },
6809         {
6810                 .procname       = "accept_ra_rt_info_max_plen",
6811                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6812                 .maxlen         = sizeof(int),
6813                 .mode           = 0644,
6814                 .proc_handler   = proc_dointvec,
6815         },
6816 #endif
6817 #endif
6818         {
6819                 .procname       = "proxy_ndp",
6820                 .data           = &ipv6_devconf.proxy_ndp,
6821                 .maxlen         = sizeof(int),
6822                 .mode           = 0644,
6823                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6824         },
6825         {
6826                 .procname       = "accept_source_route",
6827                 .data           = &ipv6_devconf.accept_source_route,
6828                 .maxlen         = sizeof(int),
6829                 .mode           = 0644,
6830                 .proc_handler   = proc_dointvec,
6831         },
6832 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6833         {
6834                 .procname       = "optimistic_dad",
6835                 .data           = &ipv6_devconf.optimistic_dad,
6836                 .maxlen         = sizeof(int),
6837                 .mode           = 0644,
6838                 .proc_handler   = proc_dointvec,
6839         },
6840         {
6841                 .procname       = "use_optimistic",
6842                 .data           = &ipv6_devconf.use_optimistic,
6843                 .maxlen         = sizeof(int),
6844                 .mode           = 0644,
6845                 .proc_handler   = proc_dointvec,
6846         },
6847 #endif
6848 #ifdef CONFIG_IPV6_MROUTE
6849         {
6850                 .procname       = "mc_forwarding",
6851                 .data           = &ipv6_devconf.mc_forwarding,
6852                 .maxlen         = sizeof(int),
6853                 .mode           = 0444,
6854                 .proc_handler   = proc_dointvec,
6855         },
6856 #endif
6857         {
6858                 .procname       = "disable_ipv6",
6859                 .data           = &ipv6_devconf.disable_ipv6,
6860                 .maxlen         = sizeof(int),
6861                 .mode           = 0644,
6862                 .proc_handler   = addrconf_sysctl_disable,
6863         },
6864         {
6865                 .procname       = "accept_dad",
6866                 .data           = &ipv6_devconf.accept_dad,
6867                 .maxlen         = sizeof(int),
6868                 .mode           = 0644,
6869                 .proc_handler   = proc_dointvec,
6870         },
6871         {
6872                 .procname       = "force_tllao",
6873                 .data           = &ipv6_devconf.force_tllao,
6874                 .maxlen         = sizeof(int),
6875                 .mode           = 0644,
6876                 .proc_handler   = proc_dointvec
6877         },
6878         {
6879                 .procname       = "ndisc_notify",
6880                 .data           = &ipv6_devconf.ndisc_notify,
6881                 .maxlen         = sizeof(int),
6882                 .mode           = 0644,
6883                 .proc_handler   = proc_dointvec
6884         },
6885         {
6886                 .procname       = "suppress_frag_ndisc",
6887                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6888                 .maxlen         = sizeof(int),
6889                 .mode           = 0644,
6890                 .proc_handler   = proc_dointvec
6891         },
6892         {
6893                 .procname       = "accept_ra_from_local",
6894                 .data           = &ipv6_devconf.accept_ra_from_local,
6895                 .maxlen         = sizeof(int),
6896                 .mode           = 0644,
6897                 .proc_handler   = proc_dointvec,
6898         },
6899         {
6900                 .procname       = "accept_ra_mtu",
6901                 .data           = &ipv6_devconf.accept_ra_mtu,
6902                 .maxlen         = sizeof(int),
6903                 .mode           = 0644,
6904                 .proc_handler   = proc_dointvec,
6905         },
6906         {
6907                 .procname       = "stable_secret",
6908                 .data           = &ipv6_devconf.stable_secret,
6909                 .maxlen         = IPV6_MAX_STRLEN,
6910                 .mode           = 0600,
6911                 .proc_handler   = addrconf_sysctl_stable_secret,
6912         },
6913         {
6914                 .procname       = "use_oif_addrs_only",
6915                 .data           = &ipv6_devconf.use_oif_addrs_only,
6916                 .maxlen         = sizeof(int),
6917                 .mode           = 0644,
6918                 .proc_handler   = proc_dointvec,
6919         },
6920         {
6921                 .procname       = "ignore_routes_with_linkdown",
6922                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6923                 .maxlen         = sizeof(int),
6924                 .mode           = 0644,
6925                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6926         },
6927         {
6928                 .procname       = "drop_unicast_in_l2_multicast",
6929                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6930                 .maxlen         = sizeof(int),
6931                 .mode           = 0644,
6932                 .proc_handler   = proc_dointvec,
6933         },
6934         {
6935                 .procname       = "drop_unsolicited_na",
6936                 .data           = &ipv6_devconf.drop_unsolicited_na,
6937                 .maxlen         = sizeof(int),
6938                 .mode           = 0644,
6939                 .proc_handler   = proc_dointvec,
6940         },
6941         {
6942                 .procname       = "keep_addr_on_down",
6943                 .data           = &ipv6_devconf.keep_addr_on_down,
6944                 .maxlen         = sizeof(int),
6945                 .mode           = 0644,
6946                 .proc_handler   = proc_dointvec,
6947
6948         },
6949         {
6950                 .procname       = "seg6_enabled",
6951                 .data           = &ipv6_devconf.seg6_enabled,
6952                 .maxlen         = sizeof(int),
6953                 .mode           = 0644,
6954                 .proc_handler   = proc_dointvec,
6955         },
6956 #ifdef CONFIG_IPV6_SEG6_HMAC
6957         {
6958                 .procname       = "seg6_require_hmac",
6959                 .data           = &ipv6_devconf.seg6_require_hmac,
6960                 .maxlen         = sizeof(int),
6961                 .mode           = 0644,
6962                 .proc_handler   = proc_dointvec,
6963         },
6964 #endif
6965         {
6966                 .procname       = "enhanced_dad",
6967                 .data           = &ipv6_devconf.enhanced_dad,
6968                 .maxlen         = sizeof(int),
6969                 .mode           = 0644,
6970                 .proc_handler   = proc_dointvec,
6971         },
6972         {
6973                 .procname       = "addr_gen_mode",
6974                 .data           = &ipv6_devconf.addr_gen_mode,
6975                 .maxlen         = sizeof(int),
6976                 .mode           = 0644,
6977                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6978         },
6979         {
6980                 .procname       = "disable_policy",
6981                 .data           = &ipv6_devconf.disable_policy,
6982                 .maxlen         = sizeof(int),
6983                 .mode           = 0644,
6984                 .proc_handler   = addrconf_sysctl_disable_policy,
6985         },
6986         {
6987                 .procname       = "ndisc_tclass",
6988                 .data           = &ipv6_devconf.ndisc_tclass,
6989                 .maxlen         = sizeof(int),
6990                 .mode           = 0644,
6991                 .proc_handler   = proc_dointvec_minmax,
6992                 .extra1         = (void *)SYSCTL_ZERO,
6993                 .extra2         = (void *)&two_five_five,
6994         },
6995         {
6996                 .procname       = "rpl_seg_enabled",
6997                 .data           = &ipv6_devconf.rpl_seg_enabled,
6998                 .maxlen         = sizeof(int),
6999                 .mode           = 0644,
7000                 .proc_handler   = proc_dointvec,
7001         },
7002         {
7003                 .procname       = "ioam6_enabled",
7004                 .data           = &ipv6_devconf.ioam6_enabled,
7005                 .maxlen         = sizeof(u8),
7006                 .mode           = 0644,
7007                 .proc_handler   = proc_dou8vec_minmax,
7008                 .extra1         = (void *)SYSCTL_ZERO,
7009                 .extra2         = (void *)SYSCTL_ONE,
7010         },
7011         {
7012                 .procname       = "ioam6_id",
7013                 .data           = &ipv6_devconf.ioam6_id,
7014                 .maxlen         = sizeof(u32),
7015                 .mode           = 0644,
7016                 .proc_handler   = proc_douintvec_minmax,
7017                 .extra1         = (void *)SYSCTL_ZERO,
7018                 .extra2         = (void *)&ioam6_if_id_max,
7019         },
7020         {
7021                 .procname       = "ioam6_id_wide",
7022                 .data           = &ipv6_devconf.ioam6_id_wide,
7023                 .maxlen         = sizeof(u32),
7024                 .mode           = 0644,
7025                 .proc_handler   = proc_douintvec,
7026         },
7027         {
7028                 .procname       = "ndisc_evict_nocarrier",
7029                 .data           = &ipv6_devconf.ndisc_evict_nocarrier,
7030                 .maxlen         = sizeof(u8),
7031                 .mode           = 0644,
7032                 .proc_handler   = proc_dou8vec_minmax,
7033                 .extra1         = (void *)SYSCTL_ZERO,
7034                 .extra2         = (void *)SYSCTL_ONE,
7035         },
7036         {
7037                 .procname       = "accept_untracked_na",
7038                 .data           = &ipv6_devconf.accept_untracked_na,
7039                 .maxlen         = sizeof(int),
7040                 .mode           = 0644,
7041                 .proc_handler   = proc_dointvec_minmax,
7042                 .extra1         = (void *)SYSCTL_ZERO,
7043                 .extra2         = (void *)SYSCTL_ONE,
7044         },
7045         {
7046                 /* sentinel */
7047         }
7048 };
7049
7050 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7051                 struct inet6_dev *idev, struct ipv6_devconf *p)
7052 {
7053         int i, ifindex;
7054         struct ctl_table *table;
7055         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7056
7057         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7058         if (!table)
7059                 goto out;
7060
7061         for (i = 0; table[i].data; i++) {
7062                 table[i].data += (char *)p - (char *)&ipv6_devconf;
7063                 /* If one of these is already set, then it is not safe to
7064                  * overwrite either of them: this makes proc_dointvec_minmax
7065                  * usable.
7066                  */
7067                 if (!table[i].extra1 && !table[i].extra2) {
7068                         table[i].extra1 = idev; /* embedded; no ref */
7069                         table[i].extra2 = net;
7070                 }
7071         }
7072
7073         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7074
7075         p->sysctl_header = register_net_sysctl(net, path, table);
7076         if (!p->sysctl_header)
7077                 goto free;
7078
7079         if (!strcmp(dev_name, "all"))
7080                 ifindex = NETCONFA_IFINDEX_ALL;
7081         else if (!strcmp(dev_name, "default"))
7082                 ifindex = NETCONFA_IFINDEX_DEFAULT;
7083         else
7084                 ifindex = idev->dev->ifindex;
7085         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7086                                      ifindex, p);
7087         return 0;
7088
7089 free:
7090         kfree(table);
7091 out:
7092         return -ENOBUFS;
7093 }
7094
7095 static void __addrconf_sysctl_unregister(struct net *net,
7096                                          struct ipv6_devconf *p, int ifindex)
7097 {
7098         struct ctl_table *table;
7099
7100         if (!p->sysctl_header)
7101                 return;
7102
7103         table = p->sysctl_header->ctl_table_arg;
7104         unregister_net_sysctl_table(p->sysctl_header);
7105         p->sysctl_header = NULL;
7106         kfree(table);
7107
7108         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7109 }
7110
7111 static int addrconf_sysctl_register(struct inet6_dev *idev)
7112 {
7113         int err;
7114
7115         if (!sysctl_dev_name_is_allowed(idev->dev->name))
7116                 return -EINVAL;
7117
7118         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7119                                     &ndisc_ifinfo_sysctl_change);
7120         if (err)
7121                 return err;
7122         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7123                                          idev, &idev->cnf);
7124         if (err)
7125                 neigh_sysctl_unregister(idev->nd_parms);
7126
7127         return err;
7128 }
7129
7130 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7131 {
7132         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7133                                      idev->dev->ifindex);
7134         neigh_sysctl_unregister(idev->nd_parms);
7135 }
7136
7137
7138 #endif
7139
7140 static int __net_init addrconf_init_net(struct net *net)
7141 {
7142         int err = -ENOMEM;
7143         struct ipv6_devconf *all, *dflt;
7144
7145         spin_lock_init(&net->ipv6.addrconf_hash_lock);
7146         INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7147         net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7148                                            sizeof(struct hlist_head),
7149                                            GFP_KERNEL);
7150         if (!net->ipv6.inet6_addr_lst)
7151                 goto err_alloc_addr;
7152
7153         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7154         if (!all)
7155                 goto err_alloc_all;
7156
7157         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7158         if (!dflt)
7159                 goto err_alloc_dflt;
7160
7161         if (IS_ENABLED(CONFIG_SYSCTL) &&
7162             !net_eq(net, &init_net)) {
7163                 switch (sysctl_devconf_inherit_init_net) {
7164                 case 1:  /* copy from init_net */
7165                         memcpy(all, init_net.ipv6.devconf_all,
7166                                sizeof(ipv6_devconf));
7167                         memcpy(dflt, init_net.ipv6.devconf_dflt,
7168                                sizeof(ipv6_devconf_dflt));
7169                         break;
7170                 case 3: /* copy from the current netns */
7171                         memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7172                                sizeof(ipv6_devconf));
7173                         memcpy(dflt,
7174                                current->nsproxy->net_ns->ipv6.devconf_dflt,
7175                                sizeof(ipv6_devconf_dflt));
7176                         break;
7177                 case 0:
7178                 case 2:
7179                         /* use compiled values */
7180                         break;
7181                 }
7182         }
7183
7184         /* these will be inherited by all namespaces */
7185         dflt->autoconf = ipv6_defaults.autoconf;
7186         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7187
7188         dflt->stable_secret.initialized = false;
7189         all->stable_secret.initialized = false;
7190
7191         net->ipv6.devconf_all = all;
7192         net->ipv6.devconf_dflt = dflt;
7193
7194 #ifdef CONFIG_SYSCTL
7195         err = __addrconf_sysctl_register(net, "all", NULL, all);
7196         if (err < 0)
7197                 goto err_reg_all;
7198
7199         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7200         if (err < 0)
7201                 goto err_reg_dflt;
7202 #endif
7203         return 0;
7204
7205 #ifdef CONFIG_SYSCTL
7206 err_reg_dflt:
7207         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7208 err_reg_all:
7209         kfree(dflt);
7210 #endif
7211 err_alloc_dflt:
7212         kfree(all);
7213 err_alloc_all:
7214         kfree(net->ipv6.inet6_addr_lst);
7215 err_alloc_addr:
7216         return err;
7217 }
7218
7219 static void __net_exit addrconf_exit_net(struct net *net)
7220 {
7221         int i;
7222
7223 #ifdef CONFIG_SYSCTL
7224         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7225                                      NETCONFA_IFINDEX_DEFAULT);
7226         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7227                                      NETCONFA_IFINDEX_ALL);
7228 #endif
7229         kfree(net->ipv6.devconf_dflt);
7230         net->ipv6.devconf_dflt = NULL;
7231         kfree(net->ipv6.devconf_all);
7232         net->ipv6.devconf_all = NULL;
7233
7234         cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7235         /*
7236          *      Check hash table, then free it.
7237          */
7238         for (i = 0; i < IN6_ADDR_HSIZE; i++)
7239                 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7240
7241         kfree(net->ipv6.inet6_addr_lst);
7242         net->ipv6.inet6_addr_lst = NULL;
7243 }
7244
7245 static struct pernet_operations addrconf_ops = {
7246         .init = addrconf_init_net,
7247         .exit = addrconf_exit_net,
7248 };
7249
7250 static struct rtnl_af_ops inet6_ops __read_mostly = {
7251         .family           = AF_INET6,
7252         .fill_link_af     = inet6_fill_link_af,
7253         .get_link_af_size = inet6_get_link_af_size,
7254         .validate_link_af = inet6_validate_link_af,
7255         .set_link_af      = inet6_set_link_af,
7256 };
7257
7258 /*
7259  *      Init / cleanup code
7260  */
7261
7262 int __init addrconf_init(void)
7263 {
7264         struct inet6_dev *idev;
7265         int err;
7266
7267         err = ipv6_addr_label_init();
7268         if (err < 0) {
7269                 pr_crit("%s: cannot initialize default policy table: %d\n",
7270                         __func__, err);
7271                 goto out;
7272         }
7273
7274         err = register_pernet_subsys(&addrconf_ops);
7275         if (err < 0)
7276                 goto out_addrlabel;
7277
7278         addrconf_wq = create_workqueue("ipv6_addrconf");
7279         if (!addrconf_wq) {
7280                 err = -ENOMEM;
7281                 goto out_nowq;
7282         }
7283
7284         rtnl_lock();
7285         idev = ipv6_add_dev(blackhole_netdev);
7286         rtnl_unlock();
7287         if (IS_ERR(idev)) {
7288                 err = PTR_ERR(idev);
7289                 goto errlo;
7290         }
7291
7292         ip6_route_init_special_entries();
7293
7294         register_netdevice_notifier(&ipv6_dev_notf);
7295
7296         addrconf_verify(&init_net);
7297
7298         rtnl_af_register(&inet6_ops);
7299
7300         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7301                                    NULL, inet6_dump_ifinfo, 0);
7302         if (err < 0)
7303                 goto errout;
7304
7305         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7306                                    inet6_rtm_newaddr, NULL, 0);
7307         if (err < 0)
7308                 goto errout;
7309         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7310                                    inet6_rtm_deladdr, NULL, 0);
7311         if (err < 0)
7312                 goto errout;
7313         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7314                                    inet6_rtm_getaddr, inet6_dump_ifaddr,
7315                                    RTNL_FLAG_DOIT_UNLOCKED);
7316         if (err < 0)
7317                 goto errout;
7318         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7319                                    NULL, inet6_dump_ifmcaddr, 0);
7320         if (err < 0)
7321                 goto errout;
7322         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7323                                    NULL, inet6_dump_ifacaddr, 0);
7324         if (err < 0)
7325                 goto errout;
7326         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7327                                    inet6_netconf_get_devconf,
7328                                    inet6_netconf_dump_devconf,
7329                                    RTNL_FLAG_DOIT_UNLOCKED);
7330         if (err < 0)
7331                 goto errout;
7332         err = ipv6_addr_label_rtnl_register();
7333         if (err < 0)
7334                 goto errout;
7335
7336         return 0;
7337 errout:
7338         rtnl_unregister_all(PF_INET6);
7339         rtnl_af_unregister(&inet6_ops);
7340         unregister_netdevice_notifier(&ipv6_dev_notf);
7341 errlo:
7342         destroy_workqueue(addrconf_wq);
7343 out_nowq:
7344         unregister_pernet_subsys(&addrconf_ops);
7345 out_addrlabel:
7346         ipv6_addr_label_cleanup();
7347 out:
7348         return err;
7349 }
7350
7351 void addrconf_cleanup(void)
7352 {
7353         struct net_device *dev;
7354
7355         unregister_netdevice_notifier(&ipv6_dev_notf);
7356         unregister_pernet_subsys(&addrconf_ops);
7357         ipv6_addr_label_cleanup();
7358
7359         rtnl_af_unregister(&inet6_ops);
7360
7361         rtnl_lock();
7362
7363         /* clean dev list */
7364         for_each_netdev(&init_net, dev) {
7365                 if (__in6_dev_get(dev) == NULL)
7366                         continue;
7367                 addrconf_ifdown(dev, true);
7368         }
7369         addrconf_ifdown(init_net.loopback_dev, true);
7370
7371         rtnl_unlock();
7372
7373         destroy_workqueue(addrconf_wq);
7374 }