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             <[email protected]>
   8  *      Alexey Kuznetsov        <[email protected]>
   9  */
  10
  11 /*
  12  *      Changes:
  13  *
  14  *      Janos Farkas                    :       delete timer on ifdown
  15  *      <[email protected]>
  16  *      Andi Kleen                      :       kill double kfree on module
  17  *                                              unload.
  18  *      Maciej W. Rozycki               :       FDDI support
  19  *      sekiya@USAGI                    :       Don't send too many RS
  20  *                                              packets.
  21  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  22  *                                              packets.
  23  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  24  *                                              address validation timer.
  25  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  26  *                                              support.
  27  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  28  *                                              address on a same interface.
  29  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  30  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  31  *                                              seq_file.
  32  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  33  *                                              selection; consider scope,
  34  *                                              status etc.
  35  */
  36
  37 #define pr_fmt(fmt) "IPv6: " fmt
  38
  39 #include <linux/errno.h>
  40 #include <linux/types.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched/signal.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/net.h>
  46 #include <linux/inet.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64 #include <linux/hash.h>
  65
  66 #include <net/net_namespace.h>
  67 #include <net/sock.h>
  68 #include <net/snmp.h>
  69
  70 #include <net/6lowpan.h>
  71 #include <net/firewire.h>
  72 #include <net/ipv6.h>
  73 #include <net/protocol.h>
  74 #include <net/ndisc.h>
  75 #include <net/ip6_route.h>
  76 #include <net/addrconf.h>
  77 #include <net/tcp.h>
  78 #include <net/ip.h>
  79 #include <net/netlink.h>
  80 #include <net/pkt_sched.h>
  81 #include <net/l3mdev.h>
  82 #include <linux/if_tunnel.h>
  83 #include <linux/rtnetlink.h>
  84 #include <linux/netconf.h>
  85 #include <linux/random.h>
  86 #include <linux/uaccess.h>
  87 #include <asm/unaligned.h>
  88
  89 #include <linux/proc_fs.h>
  90 #include <linux/seq_file.h>
  91 #include <linux/export.h>
  92 #include <linux/ioam6.h>
  93
  94 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  95
  96 #define IPV6_MAX_STRLEN \
  97         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
  98
  99 static inline u32 cstamp_delta(unsigned long cstamp)
 100 {
 101         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 102 }
 103
 104 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 105 {
 106         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 107         u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
 108         do_div(tmp, 1000000);
 109         return (s32)tmp;
 110 }
 111
 112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 113 {
 114         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 115         u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
 116         do_div(tmp, 1000000);
 117         if ((s32)tmp > mrt) {
 118                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 119                 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
 120                 do_div(tmp, 1000000);
 121         }
 122         return (s32)tmp;
 123 }
 124
 125 #ifdef CONFIG_SYSCTL
 126 static int addrconf_sysctl_register(struct inet6_dev *idev);
 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 128 #else
 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 130 {
 131         return 0;
 132 }
 133
 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 135 {
 136 }
 137 #endif
 138
 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
 140
 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 142 static int ipv6_count_addresses(const struct inet6_dev *idev);
 143 static int ipv6_generate_stable_address(struct in6_addr *addr,
 144                                         u8 dad_count,
 145                                         const struct inet6_dev *idev);
 146
 147 #define IN6_ADDR_HSIZE_SHIFT    8
 148 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
 149
 150 static void addrconf_verify(struct net *net);
 151 static void addrconf_verify_rtnl(struct net *net);
 152
 153 static struct workqueue_struct *addrconf_wq;
 154
 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 157
 158 static void addrconf_type_change(struct net_device *dev,
 159                                  unsigned long event);
 160 static int addrconf_ifdown(struct net_device *dev, bool unregister);
 161
 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 163                                                   int plen,
 164                                                   const struct net_device *dev,
 165                                                   u32 flags, u32 noflags,
 166                                                   bool no_gw);
 167
 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 169 static void addrconf_dad_work(struct work_struct *w);
 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
 171                                    bool send_na);
 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
 173 static void addrconf_rs_timer(struct timer_list *t);
 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 176
 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 178                                 struct prefix_info *pinfo);
 179
 180 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 181         .forwarding             = 0,
 182         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 183         .mtu6                   = IPV6_MIN_MTU,
 184         .accept_ra              = 1,
 185         .accept_redirects       = 1,
 186         .autoconf               = 1,
 187         .force_mld_version      = 0,
 188         .mldv1_unsolicited_report_interval = 10 * HZ,
 189         .mldv2_unsolicited_report_interval = HZ,
 190         .dad_transmits          = 1,
 191         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 192         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 193         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 194         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 195         .use_tempaddr           = 0,
 196         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 197         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 198         .regen_max_retry        = REGEN_MAX_RETRY,
 199         .max_desync_factor      = MAX_DESYNC_FACTOR,
 200         .max_addresses          = IPV6_MAX_ADDRESSES,
 201         .accept_ra_defrtr       = 1,
 202         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 203         .accept_ra_from_local   = 0,
 204         .accept_ra_min_hop_limit= 1,
 205         .accept_ra_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         netdev_hold(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                 netdev_put(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->priv_flags & IFF_NO_ADDRCONF)
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 (idev && idev->cnf.disable_ipv6)
3561                         break;
3562
3563                 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3564                         if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3565                             dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3566                                 ipv6_mc_up(idev);
3567                         break;
3568                 }
3569
3570                 if (event == NETDEV_UP) {
3571                         /* restore routes for permanent addresses */
3572                         addrconf_permanent_addr(net, dev);
3573
3574                         if (!addrconf_link_ready(dev)) {
3575                                 /* device is not ready yet. */
3576                                 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3577                                          dev->name);
3578                                 break;
3579                         }
3580
3581                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3582                                 idev = ipv6_add_dev(dev);
3583
3584                         if (!IS_ERR_OR_NULL(idev)) {
3585                                 idev->if_flags |= IF_READY;
3586                                 run_pending = 1;
3587                         }
3588                 } else if (event == NETDEV_CHANGE) {
3589                         if (!addrconf_link_ready(dev)) {
3590                                 /* device is still not ready. */
3591                                 rt6_sync_down_dev(dev, event);
3592                                 break;
3593                         }
3594
3595                         if (!IS_ERR_OR_NULL(idev)) {
3596                                 if (idev->if_flags & IF_READY) {
3597                                         /* device is already configured -
3598                                          * but resend MLD reports, we might
3599                                          * have roamed and need to update
3600                                          * multicast snooping switches
3601                                          */
3602                                         ipv6_mc_up(idev);
3603                                         change_info = ptr;
3604                                         if (change_info->flags_changed & IFF_NOARP)
3605                                                 addrconf_dad_run(idev, true);
3606                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
3607                                         break;
3608                                 }
3609                                 idev->if_flags |= IF_READY;
3610                         }
3611
3612                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3613                                 dev->name);
3614
3615                         run_pending = 1;
3616                 }
3617
3618                 switch (dev->type) {
3619 #if IS_ENABLED(CONFIG_IPV6_SIT)
3620                 case ARPHRD_SIT:
3621                         addrconf_sit_config(dev);
3622                         break;
3623 #endif
3624 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3625                 case ARPHRD_IP6GRE:
3626                 case ARPHRD_IPGRE:
3627                         addrconf_gre_config(dev);
3628                         break;
3629 #endif
3630                 case ARPHRD_LOOPBACK:
3631                         init_loopback(dev);
3632                         break;
3633
3634                 default:
3635                         addrconf_dev_config(dev);
3636                         break;
3637                 }
3638
3639                 if (!IS_ERR_OR_NULL(idev)) {
3640                         if (run_pending)
3641                                 addrconf_dad_run(idev, false);
3642
3643                         /* Device has an address by now */
3644                         rt6_sync_up(dev, RTNH_F_DEAD);
3645
3646                         /*
3647                          * If the MTU changed during the interface down,
3648                          * when the interface up, the changed MTU must be
3649                          * reflected in the idev as well as routers.
3650                          */
3651                         if (idev->cnf.mtu6 != dev->mtu &&
3652                             dev->mtu >= IPV6_MIN_MTU) {
3653                                 rt6_mtu_change(dev, dev->mtu);
3654                                 idev->cnf.mtu6 = dev->mtu;
3655                         }
3656                         idev->tstamp = jiffies;
3657                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3658
3659                         /*
3660                          * If the changed mtu during down is lower than
3661                          * IPV6_MIN_MTU stop IPv6 on this interface.
3662                          */
3663                         if (dev->mtu < IPV6_MIN_MTU)
3664                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3665                 }
3666                 break;
3667
3668         case NETDEV_DOWN:
3669         case NETDEV_UNREGISTER:
3670                 /*
3671                  *      Remove all addresses from this interface.
3672                  */
3673                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3674                 break;
3675
3676         case NETDEV_CHANGENAME:
3677                 if (idev) {
3678                         snmp6_unregister_dev(idev);
3679                         addrconf_sysctl_unregister(idev);
3680                         err = addrconf_sysctl_register(idev);
3681                         if (err)
3682                                 return notifier_from_errno(err);
3683                         err = snmp6_register_dev(idev);
3684                         if (err) {
3685                                 addrconf_sysctl_unregister(idev);
3686                                 return notifier_from_errno(err);
3687                         }
3688                 }
3689                 break;
3690
3691         case NETDEV_PRE_TYPE_CHANGE:
3692         case NETDEV_POST_TYPE_CHANGE:
3693                 if (idev)
3694                         addrconf_type_change(dev, event);
3695                 break;
3696
3697         case NETDEV_CHANGEUPPER:
3698                 info = ptr;
3699
3700                 /* flush all routes if dev is linked to or unlinked from
3701                  * an L3 master device (e.g., VRF)
3702                  */
3703                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3704                         addrconf_ifdown(dev, false);
3705         }
3706
3707         return NOTIFY_OK;
3708 }
3709
3710 /*
3711  *      addrconf module should be notified of a device going up
3712  */
3713 static struct notifier_block ipv6_dev_notf = {
3714         .notifier_call = addrconf_notify,
3715         .priority = ADDRCONF_NOTIFY_PRIORITY,
3716 };
3717
3718 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3719 {
3720         struct inet6_dev *idev;
3721         ASSERT_RTNL();
3722
3723         idev = __in6_dev_get(dev);
3724
3725         if (event == NETDEV_POST_TYPE_CHANGE)
3726                 ipv6_mc_remap(idev);
3727         else if (event == NETDEV_PRE_TYPE_CHANGE)
3728                 ipv6_mc_unmap(idev);
3729 }
3730
3731 static bool addr_is_local(const struct in6_addr *addr)
3732 {
3733         return ipv6_addr_type(addr) &
3734                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3735 }
3736
3737 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3738 {
3739         unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3740         struct net *net = dev_net(dev);
3741         struct inet6_dev *idev;
3742         struct inet6_ifaddr *ifa;
3743         LIST_HEAD(tmp_addr_list);
3744         bool keep_addr = false;
3745         bool was_ready;
3746         int state, i;
3747
3748         ASSERT_RTNL();
3749
3750         rt6_disable_ip(dev, event);
3751
3752         idev = __in6_dev_get(dev);
3753         if (!idev)
3754                 return -ENODEV;
3755
3756         /*
3757          * Step 1: remove reference to ipv6 device from parent device.
3758          *         Do not dev_put!
3759          */
3760         if (unregister) {
3761                 idev->dead = 1;
3762
3763                 /* protected by rtnl_lock */
3764                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3765
3766                 /* Step 1.5: remove snmp6 entry */
3767                 snmp6_unregister_dev(idev);
3768
3769         }
3770
3771         /* combine the user config with event to determine if permanent
3772          * addresses are to be removed from address hash table
3773          */
3774         if (!unregister && !idev->cnf.disable_ipv6) {
3775                 /* aggregate the system setting and interface setting */
3776                 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3777
3778                 if (!_keep_addr)
3779                         _keep_addr = idev->cnf.keep_addr_on_down;
3780
3781                 keep_addr = (_keep_addr > 0);
3782         }
3783
3784         /* Step 2: clear hash table */
3785         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3786                 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3787
3788                 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3789 restart:
3790                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3791                         if (ifa->idev == idev) {
3792                                 addrconf_del_dad_work(ifa);
3793                                 /* combined flag + permanent flag decide if
3794                                  * address is retained on a down event
3795                                  */
3796                                 if (!keep_addr ||
3797                                     !(ifa->flags & IFA_F_PERMANENT) ||
3798                                     addr_is_local(&ifa->addr)) {
3799                                         hlist_del_init_rcu(&ifa->addr_lst);
3800                                         goto restart;
3801                                 }
3802                         }
3803                 }
3804                 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3805         }
3806
3807         write_lock_bh(&idev->lock);
3808
3809         addrconf_del_rs_timer(idev);
3810
3811         /* Step 2: clear flags for stateless addrconf, repeated down
3812          *         detection
3813          */
3814         was_ready = idev->if_flags & IF_READY;
3815         if (!unregister)
3816                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3817
3818         /* Step 3: clear tempaddr list */
3819         while (!list_empty(&idev->tempaddr_list)) {
3820                 ifa = list_first_entry(&idev->tempaddr_list,
3821                                        struct inet6_ifaddr, tmp_list);
3822                 list_del(&ifa->tmp_list);
3823                 write_unlock_bh(&idev->lock);
3824                 spin_lock_bh(&ifa->lock);
3825
3826                 if (ifa->ifpub) {
3827                         in6_ifa_put(ifa->ifpub);
3828                         ifa->ifpub = NULL;
3829                 }
3830                 spin_unlock_bh(&ifa->lock);
3831                 in6_ifa_put(ifa);
3832                 write_lock_bh(&idev->lock);
3833         }
3834
3835         list_for_each_entry(ifa, &idev->addr_list, if_list)
3836                 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3837         write_unlock_bh(&idev->lock);
3838
3839         while (!list_empty(&tmp_addr_list)) {
3840                 struct fib6_info *rt = NULL;
3841                 bool keep;
3842
3843                 ifa = list_first_entry(&tmp_addr_list,
3844                                        struct inet6_ifaddr, if_list_aux);
3845                 list_del(&ifa->if_list_aux);
3846
3847                 addrconf_del_dad_work(ifa);
3848
3849                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3850                         !addr_is_local(&ifa->addr);
3851
3852                 spin_lock_bh(&ifa->lock);
3853
3854                 if (keep) {
3855                         /* set state to skip the notifier below */
3856                         state = INET6_IFADDR_STATE_DEAD;
3857                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3858                         if (!(ifa->flags & IFA_F_NODAD))
3859                                 ifa->flags |= IFA_F_TENTATIVE;
3860
3861                         rt = ifa->rt;
3862                         ifa->rt = NULL;
3863                 } else {
3864                         state = ifa->state;
3865                         ifa->state = INET6_IFADDR_STATE_DEAD;
3866                 }
3867
3868                 spin_unlock_bh(&ifa->lock);
3869
3870                 if (rt)
3871                         ip6_del_rt(net, rt, false);
3872
3873                 if (state != INET6_IFADDR_STATE_DEAD) {
3874                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3875                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3876                 } else {
3877                         if (idev->cnf.forwarding)
3878                                 addrconf_leave_anycast(ifa);
3879                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3880                 }
3881
3882                 if (!keep) {
3883                         write_lock_bh(&idev->lock);
3884                         list_del_rcu(&ifa->if_list);
3885                         write_unlock_bh(&idev->lock);
3886                         in6_ifa_put(ifa);
3887                 }
3888         }
3889
3890         /* Step 5: Discard anycast and multicast list */
3891         if (unregister) {
3892                 ipv6_ac_destroy_dev(idev);
3893                 ipv6_mc_destroy_dev(idev);
3894         } else if (was_ready) {
3895                 ipv6_mc_down(idev);
3896         }
3897
3898         idev->tstamp = jiffies;
3899         idev->ra_mtu = 0;
3900
3901         /* Last: Shot the device (if unregistered) */
3902         if (unregister) {
3903                 addrconf_sysctl_unregister(idev);
3904                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3905                 neigh_ifdown(&nd_tbl, dev);
3906                 in6_dev_put(idev);
3907         }
3908         return 0;
3909 }
3910
3911 static void addrconf_rs_timer(struct timer_list *t)
3912 {
3913         struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3914         struct net_device *dev = idev->dev;
3915         struct in6_addr lladdr;
3916
3917         write_lock(&idev->lock);
3918         if (idev->dead || !(idev->if_flags & IF_READY))
3919                 goto out;
3920
3921         if (!ipv6_accept_ra(idev))
3922                 goto out;
3923
3924         /* Announcement received after solicitation was sent */
3925         if (idev->if_flags & IF_RA_RCVD)
3926                 goto out;
3927
3928         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3929                 write_unlock(&idev->lock);
3930                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3931                         ndisc_send_rs(dev, &lladdr,
3932                                       &in6addr_linklocal_allrouters);
3933                 else
3934                         goto put;
3935
3936                 write_lock(&idev->lock);
3937                 idev->rs_interval = rfc3315_s14_backoff_update(
3938                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3939                 /* The wait after the last probe can be shorter */
3940                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3941                                              idev->cnf.rtr_solicits) ?
3942                                       idev->cnf.rtr_solicit_delay :
3943                                       idev->rs_interval);
3944         } else {
3945                 /*
3946                  * Note: we do not support deprecated "all on-link"
3947                  * assumption any longer.
3948                  */
3949                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3950         }
3951
3952 out:
3953         write_unlock(&idev->lock);
3954 put:
3955         in6_dev_put(idev);
3956 }
3957
3958 /*
3959  *      Duplicate Address Detection
3960  */
3961 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3962 {
3963         unsigned long rand_num;
3964         struct inet6_dev *idev = ifp->idev;
3965         u64 nonce;
3966
3967         if (ifp->flags & IFA_F_OPTIMISTIC)
3968                 rand_num = 0;
3969         else
3970                 rand_num = get_random_u32_below(idev->cnf.rtr_solicit_delay ? : 1);
3971
3972         nonce = 0;
3973         if (idev->cnf.enhanced_dad ||
3974             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3975                 do
3976                         get_random_bytes(&nonce, 6);
3977                 while (nonce == 0);
3978         }
3979         ifp->dad_nonce = nonce;
3980         ifp->dad_probes = idev->cnf.dad_transmits;
3981         addrconf_mod_dad_work(ifp, rand_num);
3982 }
3983
3984 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3985 {
3986         struct inet6_dev *idev = ifp->idev;
3987         struct net_device *dev = idev->dev;
3988         bool bump_id, notify = false;
3989         struct net *net;
3990
3991         addrconf_join_solict(dev, &ifp->addr);
3992
3993         read_lock_bh(&idev->lock);
3994         spin_lock(&ifp->lock);
3995         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3996                 goto out;
3997
3998         net = dev_net(dev);
3999         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4000             (net->ipv6.devconf_all->accept_dad < 1 &&
4001              idev->cnf.accept_dad < 1) ||
4002             !(ifp->flags&IFA_F_TENTATIVE) ||
4003             ifp->flags & IFA_F_NODAD) {
4004                 bool send_na = false;
4005
4006                 if (ifp->flags & IFA_F_TENTATIVE &&
4007                     !(ifp->flags & IFA_F_OPTIMISTIC))
4008                         send_na = true;
4009                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4010                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4011                 spin_unlock(&ifp->lock);
4012                 read_unlock_bh(&idev->lock);
4013
4014                 addrconf_dad_completed(ifp, bump_id, send_na);
4015                 return;
4016         }
4017
4018         if (!(idev->if_flags & IF_READY)) {
4019                 spin_unlock(&ifp->lock);
4020                 read_unlock_bh(&idev->lock);
4021                 /*
4022                  * If the device is not ready:
4023                  * - keep it tentative if it is a permanent address.
4024                  * - otherwise, kill it.
4025                  */
4026                 in6_ifa_hold(ifp);
4027                 addrconf_dad_stop(ifp, 0);
4028                 return;
4029         }
4030
4031         /*
4032          * Optimistic nodes can start receiving
4033          * Frames right away
4034          */
4035         if (ifp->flags & IFA_F_OPTIMISTIC) {
4036                 ip6_ins_rt(net, ifp->rt);
4037                 if (ipv6_use_optimistic_addr(net, idev)) {
4038                         /* Because optimistic nodes can use this address,
4039                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
4040                          */
4041                         notify = true;
4042                 }
4043         }
4044
4045         addrconf_dad_kick(ifp);
4046 out:
4047         spin_unlock(&ifp->lock);
4048         read_unlock_bh(&idev->lock);
4049         if (notify)
4050                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4051 }
4052
4053 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4054 {
4055         bool begin_dad = false;
4056
4057         spin_lock_bh(&ifp->lock);
4058         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4059                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4060                 begin_dad = true;
4061         }
4062         spin_unlock_bh(&ifp->lock);
4063
4064         if (begin_dad)
4065                 addrconf_mod_dad_work(ifp, 0);
4066 }
4067
4068 static void addrconf_dad_work(struct work_struct *w)
4069 {
4070         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4071                                                 struct inet6_ifaddr,
4072                                                 dad_work);
4073         struct inet6_dev *idev = ifp->idev;
4074         bool bump_id, disable_ipv6 = false;
4075         struct in6_addr mcaddr;
4076
4077         enum {
4078                 DAD_PROCESS,
4079                 DAD_BEGIN,
4080                 DAD_ABORT,
4081         } action = DAD_PROCESS;
4082
4083         rtnl_lock();
4084
4085         spin_lock_bh(&ifp->lock);
4086         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4087                 action = DAD_BEGIN;
4088                 ifp->state = INET6_IFADDR_STATE_DAD;
4089         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4090                 action = DAD_ABORT;
4091                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4092
4093                 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4094                      idev->cnf.accept_dad > 1) &&
4095                     !idev->cnf.disable_ipv6 &&
4096                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4097                         struct in6_addr addr;
4098
4099                         addr.s6_addr32[0] = htonl(0xfe800000);
4100                         addr.s6_addr32[1] = 0;
4101
4102                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4103                             ipv6_addr_equal(&ifp->addr, &addr)) {
4104                                 /* DAD failed for link-local based on MAC */
4105                                 idev->cnf.disable_ipv6 = 1;
4106
4107                                 pr_info("%s: IPv6 being disabled!\n",
4108                                         ifp->idev->dev->name);
4109                                 disable_ipv6 = true;
4110                         }
4111                 }
4112         }
4113         spin_unlock_bh(&ifp->lock);
4114
4115         if (action == DAD_BEGIN) {
4116                 addrconf_dad_begin(ifp);
4117                 goto out;
4118         } else if (action == DAD_ABORT) {
4119                 in6_ifa_hold(ifp);
4120                 addrconf_dad_stop(ifp, 1);
4121                 if (disable_ipv6)
4122                         addrconf_ifdown(idev->dev, false);
4123                 goto out;
4124         }
4125
4126         if (!ifp->dad_probes && addrconf_dad_end(ifp))
4127                 goto out;
4128
4129         write_lock_bh(&idev->lock);
4130         if (idev->dead || !(idev->if_flags & IF_READY)) {
4131                 write_unlock_bh(&idev->lock);
4132                 goto out;
4133         }
4134
4135         spin_lock(&ifp->lock);
4136         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4137                 spin_unlock(&ifp->lock);
4138                 write_unlock_bh(&idev->lock);
4139                 goto out;
4140         }
4141
4142         if (ifp->dad_probes == 0) {
4143                 bool send_na = false;
4144
4145                 /*
4146                  * DAD was successful
4147                  */
4148
4149                 if (ifp->flags & IFA_F_TENTATIVE &&
4150                     !(ifp->flags & IFA_F_OPTIMISTIC))
4151                         send_na = true;
4152                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4153                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4154                 spin_unlock(&ifp->lock);
4155                 write_unlock_bh(&idev->lock);
4156
4157                 addrconf_dad_completed(ifp, bump_id, send_na);
4158
4159                 goto out;
4160         }
4161
4162         ifp->dad_probes--;
4163         addrconf_mod_dad_work(ifp,
4164                               max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4165                                   HZ/100));
4166         spin_unlock(&ifp->lock);
4167         write_unlock_bh(&idev->lock);
4168
4169         /* send a neighbour solicitation for our addr */
4170         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4171         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4172                       ifp->dad_nonce);
4173 out:
4174         in6_ifa_put(ifp);
4175         rtnl_unlock();
4176 }
4177
4178 /* ifp->idev must be at least read locked */
4179 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4180 {
4181         struct inet6_ifaddr *ifpiter;
4182         struct inet6_dev *idev = ifp->idev;
4183
4184         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4185                 if (ifpiter->scope > IFA_LINK)
4186                         break;
4187                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4188                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4189                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4190                     IFA_F_PERMANENT)
4191                         return false;
4192         }
4193         return true;
4194 }
4195
4196 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4197                                    bool send_na)
4198 {
4199         struct net_device *dev = ifp->idev->dev;
4200         struct in6_addr lladdr;
4201         bool send_rs, send_mld;
4202
4203         addrconf_del_dad_work(ifp);
4204
4205         /*
4206          *      Configure the address for reception. Now it is valid.
4207          */
4208
4209         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4210
4211         /* If added prefix is link local and we are prepared to process
4212            router advertisements, start sending router solicitations.
4213          */
4214
4215         read_lock_bh(&ifp->idev->lock);
4216         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4217         send_rs = send_mld &&
4218                   ipv6_accept_ra(ifp->idev) &&
4219                   ifp->idev->cnf.rtr_solicits != 0 &&
4220                   (dev->flags & IFF_LOOPBACK) == 0 &&
4221                   (dev->type != ARPHRD_TUNNEL);
4222         read_unlock_bh(&ifp->idev->lock);
4223
4224         /* While dad is in progress mld report's source address is in6_addrany.
4225          * Resend with proper ll now.
4226          */
4227         if (send_mld)
4228                 ipv6_mc_dad_complete(ifp->idev);
4229
4230         /* send unsolicited NA if enabled */
4231         if (send_na &&
4232             (ifp->idev->cnf.ndisc_notify ||
4233              dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4234                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4235                               /*router=*/ !!ifp->idev->cnf.forwarding,
4236                               /*solicited=*/ false, /*override=*/ true,
4237                               /*inc_opt=*/ true);
4238         }
4239
4240         if (send_rs) {
4241                 /*
4242                  *      If a host as already performed a random delay
4243                  *      [...] as part of DAD [...] there is no need
4244                  *      to delay again before sending the first RS
4245                  */
4246                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4247                         return;
4248                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4249
4250                 write_lock_bh(&ifp->idev->lock);
4251                 spin_lock(&ifp->lock);
4252                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4253                         ifp->idev->cnf.rtr_solicit_interval);
4254                 ifp->idev->rs_probes = 1;
4255                 ifp->idev->if_flags |= IF_RS_SENT;
4256                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4257                 spin_unlock(&ifp->lock);
4258                 write_unlock_bh(&ifp->idev->lock);
4259         }
4260
4261         if (bump_id)
4262                 rt_genid_bump_ipv6(dev_net(dev));
4263
4264         /* Make sure that a new temporary address will be created
4265          * before this temporary address becomes deprecated.
4266          */
4267         if (ifp->flags & IFA_F_TEMPORARY)
4268                 addrconf_verify_rtnl(dev_net(dev));
4269 }
4270
4271 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4272 {
4273         struct inet6_ifaddr *ifp;
4274
4275         read_lock_bh(&idev->lock);
4276         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4277                 spin_lock(&ifp->lock);
4278                 if ((ifp->flags & IFA_F_TENTATIVE &&
4279                      ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4280                         if (restart)
4281                                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4282                         addrconf_dad_kick(ifp);
4283                 }
4284                 spin_unlock(&ifp->lock);
4285         }
4286         read_unlock_bh(&idev->lock);
4287 }
4288
4289 #ifdef CONFIG_PROC_FS
4290 struct if6_iter_state {
4291         struct seq_net_private p;
4292         int bucket;
4293         int offset;
4294 };
4295
4296 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4297 {
4298         struct if6_iter_state *state = seq->private;
4299         struct net *net = seq_file_net(seq);
4300         struct inet6_ifaddr *ifa = NULL;
4301         int p = 0;
4302
4303         /* initial bucket if pos is 0 */
4304         if (pos == 0) {
4305                 state->bucket = 0;
4306                 state->offset = 0;
4307         }
4308
4309         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4310                 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4311                                          addr_lst) {
4312                         /* sync with offset */
4313                         if (p < state->offset) {
4314                                 p++;
4315                                 continue;
4316                         }
4317                         return ifa;
4318                 }
4319
4320                 /* prepare for next bucket */
4321                 state->offset = 0;
4322                 p = 0;
4323         }
4324         return NULL;
4325 }
4326
4327 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4328                                          struct inet6_ifaddr *ifa)
4329 {
4330         struct if6_iter_state *state = seq->private;
4331         struct net *net = seq_file_net(seq);
4332
4333         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4334                 state->offset++;
4335                 return ifa;
4336         }
4337
4338         state->offset = 0;
4339         while (++state->bucket < IN6_ADDR_HSIZE) {
4340                 hlist_for_each_entry_rcu(ifa,
4341                                      &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4342                         return ifa;
4343                 }
4344         }
4345
4346         return NULL;
4347 }
4348
4349 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4350         __acquires(rcu)
4351 {
4352         rcu_read_lock();
4353         return if6_get_first(seq, *pos);
4354 }
4355
4356 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4357 {
4358         struct inet6_ifaddr *ifa;
4359
4360         ifa = if6_get_next(seq, v);
4361         ++*pos;
4362         return ifa;
4363 }
4364
4365 static void if6_seq_stop(struct seq_file *seq, void *v)
4366         __releases(rcu)
4367 {
4368         rcu_read_unlock();
4369 }
4370
4371 static int if6_seq_show(struct seq_file *seq, void *v)
4372 {
4373         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4374         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4375                    &ifp->addr,
4376                    ifp->idev->dev->ifindex,
4377                    ifp->prefix_len,
4378                    ifp->scope,
4379                    (u8) ifp->flags,
4380                    ifp->idev->dev->name);
4381         return 0;
4382 }
4383
4384 static const struct seq_operations if6_seq_ops = {
4385         .start  = if6_seq_start,
4386         .next   = if6_seq_next,
4387         .show   = if6_seq_show,
4388         .stop   = if6_seq_stop,
4389 };
4390
4391 static int __net_init if6_proc_net_init(struct net *net)
4392 {
4393         if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4394                         sizeof(struct if6_iter_state)))
4395                 return -ENOMEM;
4396         return 0;
4397 }
4398
4399 static void __net_exit if6_proc_net_exit(struct net *net)
4400 {
4401         remove_proc_entry("if_inet6", net->proc_net);
4402 }
4403
4404 static struct pernet_operations if6_proc_net_ops = {
4405         .init = if6_proc_net_init,
4406         .exit = if6_proc_net_exit,
4407 };
4408
4409 int __init if6_proc_init(void)
4410 {
4411         return register_pernet_subsys(&if6_proc_net_ops);
4412 }
4413
4414 void if6_proc_exit(void)
4415 {
4416         unregister_pernet_subsys(&if6_proc_net_ops);
4417 }
4418 #endif  /* CONFIG_PROC_FS */
4419
4420 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4421 /* Check if address is a home address configured on any interface. */
4422 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4423 {
4424         unsigned int hash = inet6_addr_hash(net, addr);
4425         struct inet6_ifaddr *ifp = NULL;
4426         int ret = 0;
4427
4428         rcu_read_lock();
4429         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4430                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4431                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4432                         ret = 1;
4433                         break;
4434                 }
4435         }
4436         rcu_read_unlock();
4437         return ret;
4438 }
4439 #endif
4440
4441 /* RFC6554 has some algorithm to avoid loops in segment routing by
4442  * checking if the segments contains any of a local interface address.
4443  *
4444  * Quote:
4445  *
4446  * To detect loops in the SRH, a router MUST determine if the SRH
4447  * includes multiple addresses assigned to any interface on that router.
4448  * If such addresses appear more than once and are separated by at least
4449  * one address not assigned to that router.
4450  */
4451 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4452                           unsigned char nsegs)
4453 {
4454         const struct in6_addr *addr;
4455         int i, ret = 0, found = 0;
4456         struct inet6_ifaddr *ifp;
4457         bool separated = false;
4458         unsigned int hash;
4459         bool hash_found;
4460
4461         rcu_read_lock();
4462         for (i = 0; i < nsegs; i++) {
4463                 addr = &segs[i];
4464                 hash = inet6_addr_hash(net, addr);
4465
4466                 hash_found = false;
4467                 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4468
4469                         if (ipv6_addr_equal(&ifp->addr, addr)) {
4470                                 hash_found = true;
4471                                 break;
4472                         }
4473                 }
4474
4475                 if (hash_found) {
4476                         if (found > 1 && separated) {
4477                                 ret = 1;
4478                                 break;
4479                         }
4480
4481                         separated = false;
4482                         found++;
4483                 } else {
4484                         separated = true;
4485                 }
4486         }
4487         rcu_read_unlock();
4488
4489         return ret;
4490 }
4491
4492 /*
4493  *      Periodic address status verification
4494  */
4495
4496 static void addrconf_verify_rtnl(struct net *net)
4497 {
4498         unsigned long now, next, next_sec, next_sched;
4499         struct inet6_ifaddr *ifp;
4500         int i;
4501
4502         ASSERT_RTNL();
4503
4504         rcu_read_lock_bh();
4505         now = jiffies;
4506         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4507
4508         cancel_delayed_work(&net->ipv6.addr_chk_work);
4509
4510         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4511 restart:
4512                 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4513                         unsigned long age;
4514
4515                         /* When setting preferred_lft to a value not zero or
4516                          * infinity, while valid_lft is infinity
4517                          * IFA_F_PERMANENT has a non-infinity life time.
4518                          */
4519                         if ((ifp->flags & IFA_F_PERMANENT) &&
4520                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4521                                 continue;
4522
4523                         spin_lock(&ifp->lock);
4524                         /* We try to batch several events at once. */
4525                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4526
4527                         if ((ifp->flags&IFA_F_TEMPORARY) &&
4528                             !(ifp->flags&IFA_F_TENTATIVE) &&
4529                             ifp->prefered_lft != INFINITY_LIFE_TIME &&
4530                             !ifp->regen_count && ifp->ifpub) {
4531                                 /* This is a non-regenerated temporary addr. */
4532
4533                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4534                                         ifp->idev->cnf.dad_transmits *
4535                                         max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4536
4537                                 if (age + regen_advance >= ifp->prefered_lft) {
4538                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4539                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4540                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4541
4542                                         ifp->regen_count++;
4543                                         in6_ifa_hold(ifp);
4544                                         in6_ifa_hold(ifpub);
4545                                         spin_unlock(&ifp->lock);
4546
4547                                         spin_lock(&ifpub->lock);
4548                                         ifpub->regen_count = 0;
4549                                         spin_unlock(&ifpub->lock);
4550                                         rcu_read_unlock_bh();
4551                                         ipv6_create_tempaddr(ifpub, true);
4552                                         in6_ifa_put(ifpub);
4553                                         in6_ifa_put(ifp);
4554                                         rcu_read_lock_bh();
4555                                         goto restart;
4556                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4557                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4558                         }
4559
4560                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4561                             age >= ifp->valid_lft) {
4562                                 spin_unlock(&ifp->lock);
4563                                 in6_ifa_hold(ifp);
4564                                 rcu_read_unlock_bh();
4565                                 ipv6_del_addr(ifp);
4566                                 rcu_read_lock_bh();
4567                                 goto restart;
4568                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4569                                 spin_unlock(&ifp->lock);
4570                                 continue;
4571                         } else if (age >= ifp->prefered_lft) {
4572                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4573                                 int deprecate = 0;
4574
4575                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4576                                         deprecate = 1;
4577                                         ifp->flags |= IFA_F_DEPRECATED;
4578                                 }
4579
4580                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4581                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4582                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4583
4584                                 spin_unlock(&ifp->lock);
4585
4586                                 if (deprecate) {
4587                                         in6_ifa_hold(ifp);
4588
4589                                         ipv6_ifa_notify(0, ifp);
4590                                         in6_ifa_put(ifp);
4591                                         goto restart;
4592                                 }
4593                         } else {
4594                                 /* ifp->prefered_lft <= ifp->valid_lft */
4595                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4596                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4597                                 spin_unlock(&ifp->lock);
4598                         }
4599                 }
4600         }
4601
4602         next_sec = round_jiffies_up(next);
4603         next_sched = next;
4604
4605         /* If rounded timeout is accurate enough, accept it. */
4606         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4607                 next_sched = next_sec;
4608
4609         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4610         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4611                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4612
4613         pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4614                  now, next, next_sec, next_sched);
4615         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4616         rcu_read_unlock_bh();
4617 }
4618
4619 static void addrconf_verify_work(struct work_struct *w)
4620 {
4621         struct net *net = container_of(to_delayed_work(w), struct net,
4622                                        ipv6.addr_chk_work);
4623
4624         rtnl_lock();
4625         addrconf_verify_rtnl(net);
4626         rtnl_unlock();
4627 }
4628
4629 static void addrconf_verify(struct net *net)
4630 {
4631         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4632 }
4633
4634 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4635                                      struct in6_addr **peer_pfx)
4636 {
4637         struct in6_addr *pfx = NULL;
4638
4639         *peer_pfx = NULL;
4640
4641         if (addr)
4642                 pfx = nla_data(addr);
4643
4644         if (local) {
4645                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4646                         *peer_pfx = pfx;
4647                 pfx = nla_data(local);
4648         }
4649
4650         return pfx;
4651 }
4652
4653 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4654         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4655         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4656         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4657         [IFA_FLAGS]             = { .len = sizeof(u32) },
4658         [IFA_RT_PRIORITY]       = { .len = sizeof(u32) },
4659         [IFA_TARGET_NETNSID]    = { .type = NLA_S32 },
4660         [IFA_PROTO]             = { .type = NLA_U8 },
4661 };
4662
4663 static int
4664 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4665                   struct netlink_ext_ack *extack)
4666 {
4667         struct net *net = sock_net(skb->sk);
4668         struct ifaddrmsg *ifm;
4669         struct nlattr *tb[IFA_MAX+1];
4670         struct in6_addr *pfx, *peer_pfx;
4671         u32 ifa_flags;
4672         int err;
4673
4674         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4675                                      ifa_ipv6_policy, extack);
4676         if (err < 0)
4677                 return err;
4678
4679         ifm = nlmsg_data(nlh);
4680         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4681         if (!pfx)
4682                 return -EINVAL;
4683
4684         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4685
4686         /* We ignore other flags so far. */
4687         ifa_flags &= IFA_F_MANAGETEMPADDR;
4688
4689         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4690                               ifm->ifa_prefixlen);
4691 }
4692
4693 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4694                                unsigned long expires, u32 flags,
4695                                bool modify_peer)
4696 {
4697         struct fib6_info *f6i;
4698         u32 prio;
4699
4700         f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4701                                         ifp->prefix_len,
4702                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
4703         if (!f6i)
4704                 return -ENOENT;
4705
4706         prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4707         if (f6i->fib6_metric != prio) {
4708                 /* delete old one */
4709                 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4710
4711                 /* add new one */
4712                 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4713                                       ifp->prefix_len,
4714                                       ifp->rt_priority, ifp->idev->dev,
4715                                       expires, flags, GFP_KERNEL);
4716         } else {
4717                 if (!expires)
4718                         fib6_clean_expires(f6i);
4719                 else
4720                         fib6_set_expires(f6i, expires);
4721
4722                 fib6_info_release(f6i);
4723         }
4724
4725         return 0;
4726 }
4727
4728 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4729                              struct ifa6_config *cfg)
4730 {
4731         u32 flags;
4732         clock_t expires;
4733         unsigned long timeout;
4734         bool was_managetempaddr;
4735         bool had_prefixroute;
4736         bool new_peer = false;
4737
4738         ASSERT_RTNL();
4739
4740         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4741                 return -EINVAL;
4742
4743         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4744             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4745                 return -EINVAL;
4746
4747         if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4748                 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4749
4750         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4751         if (addrconf_finite_timeout(timeout)) {
4752                 expires = jiffies_to_clock_t(timeout * HZ);
4753                 cfg->valid_lft = timeout;
4754                 flags = RTF_EXPIRES;
4755         } else {
4756                 expires = 0;
4757                 flags = 0;
4758                 cfg->ifa_flags |= IFA_F_PERMANENT;
4759         }
4760
4761         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4762         if (addrconf_finite_timeout(timeout)) {
4763                 if (timeout == 0)
4764                         cfg->ifa_flags |= IFA_F_DEPRECATED;
4765                 cfg->preferred_lft = timeout;
4766         }
4767
4768         if (cfg->peer_pfx &&
4769             memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4770                 if (!ipv6_addr_any(&ifp->peer_addr))
4771                         cleanup_prefix_route(ifp, expires, true, true);
4772                 new_peer = true;
4773         }
4774
4775         spin_lock_bh(&ifp->lock);
4776         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4777         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4778                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4779         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4780                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4781                         IFA_F_NOPREFIXROUTE);
4782         ifp->flags |= cfg->ifa_flags;
4783         ifp->tstamp = jiffies;
4784         ifp->valid_lft = cfg->valid_lft;
4785         ifp->prefered_lft = cfg->preferred_lft;
4786         ifp->ifa_proto = cfg->ifa_proto;
4787
4788         if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4789                 ifp->rt_priority = cfg->rt_priority;
4790
4791         if (new_peer)
4792                 ifp->peer_addr = *cfg->peer_pfx;
4793
4794         spin_unlock_bh(&ifp->lock);
4795         if (!(ifp->flags&IFA_F_TENTATIVE))
4796                 ipv6_ifa_notify(0, ifp);
4797
4798         if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4799                 int rc = -ENOENT;
4800
4801                 if (had_prefixroute)
4802                         rc = modify_prefix_route(ifp, expires, flags, false);
4803
4804                 /* prefix route could have been deleted; if so restore it */
4805                 if (rc == -ENOENT) {
4806                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4807                                               ifp->rt_priority, ifp->idev->dev,
4808                                               expires, flags, GFP_KERNEL);
4809                 }
4810
4811                 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4812                         rc = modify_prefix_route(ifp, expires, flags, true);
4813
4814                 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4815                         addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4816                                               ifp->rt_priority, ifp->idev->dev,
4817                                               expires, flags, GFP_KERNEL);
4818                 }
4819         } else if (had_prefixroute) {
4820                 enum cleanup_prefix_rt_t action;
4821                 unsigned long rt_expires;
4822
4823                 write_lock_bh(&ifp->idev->lock);
4824                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4825                 write_unlock_bh(&ifp->idev->lock);
4826
4827                 if (action != CLEANUP_PREFIX_RT_NOP) {
4828                         cleanup_prefix_route(ifp, rt_expires,
4829                                 action == CLEANUP_PREFIX_RT_DEL, false);
4830                 }
4831         }
4832
4833         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4834                 if (was_managetempaddr &&
4835                     !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4836                         cfg->valid_lft = 0;
4837                         cfg->preferred_lft = 0;
4838                 }
4839                 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4840                                  cfg->preferred_lft, !was_managetempaddr,
4841                                  jiffies);
4842         }
4843
4844         addrconf_verify_rtnl(net);
4845
4846         return 0;
4847 }
4848
4849 static int
4850 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4851                   struct netlink_ext_ack *extack)
4852 {
4853         struct net *net = sock_net(skb->sk);
4854         struct ifaddrmsg *ifm;
4855         struct nlattr *tb[IFA_MAX+1];
4856         struct in6_addr *peer_pfx;
4857         struct inet6_ifaddr *ifa;
4858         struct net_device *dev;
4859         struct inet6_dev *idev;
4860         struct ifa6_config cfg;
4861         int err;
4862
4863         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4864                                      ifa_ipv6_policy, extack);
4865         if (err < 0)
4866                 return err;
4867
4868         memset(&cfg, 0, sizeof(cfg));
4869
4870         ifm = nlmsg_data(nlh);
4871         cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4872         if (!cfg.pfx)
4873                 return -EINVAL;
4874
4875         cfg.peer_pfx = peer_pfx;
4876         cfg.plen = ifm->ifa_prefixlen;
4877         if (tb[IFA_RT_PRIORITY])
4878                 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4879
4880         if (tb[IFA_PROTO])
4881                 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4882
4883         cfg.valid_lft = INFINITY_LIFE_TIME;
4884         cfg.preferred_lft = INFINITY_LIFE_TIME;
4885
4886         if (tb[IFA_CACHEINFO]) {
4887                 struct ifa_cacheinfo *ci;
4888
4889                 ci = nla_data(tb[IFA_CACHEINFO]);
4890                 cfg.valid_lft = ci->ifa_valid;
4891                 cfg.preferred_lft = ci->ifa_prefered;
4892         }
4893
4894         dev =  __dev_get_by_index(net, ifm->ifa_index);
4895         if (!dev)
4896                 return -ENODEV;
4897
4898         if (tb[IFA_FLAGS])
4899                 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4900         else
4901                 cfg.ifa_flags = ifm->ifa_flags;
4902
4903         /* We ignore other flags so far. */
4904         cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4905                          IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4906                          IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4907
4908         idev = ipv6_find_idev(dev);
4909         if (IS_ERR(idev))
4910                 return PTR_ERR(idev);
4911
4912         if (!ipv6_allow_optimistic_dad(net, idev))
4913                 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4914
4915         if (cfg.ifa_flags & IFA_F_NODAD &&
4916             cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4917                 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4918                 return -EINVAL;
4919         }
4920
4921         ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4922         if (!ifa) {
4923                 /*
4924                  * It would be best to check for !NLM_F_CREATE here but
4925                  * userspace already relies on not having to provide this.
4926                  */
4927                 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4928         }
4929
4930         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4931             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4932                 err = -EEXIST;
4933         else
4934                 err = inet6_addr_modify(net, ifa, &cfg);
4935
4936         in6_ifa_put(ifa);
4937
4938         return err;
4939 }
4940
4941 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4942                           u8 scope, int ifindex)
4943 {
4944         struct ifaddrmsg *ifm;
4945
4946         ifm = nlmsg_data(nlh);
4947         ifm->ifa_family = AF_INET6;
4948         ifm->ifa_prefixlen = prefixlen;
4949         ifm->ifa_flags = flags;
4950         ifm->ifa_scope = scope;
4951         ifm->ifa_index = ifindex;
4952 }
4953
4954 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4955                          unsigned long tstamp, u32 preferred, u32 valid)
4956 {
4957         struct ifa_cacheinfo ci;
4958
4959         ci.cstamp = cstamp_delta(cstamp);
4960         ci.tstamp = cstamp_delta(tstamp);
4961         ci.ifa_prefered = preferred;
4962         ci.ifa_valid = valid;
4963
4964         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4965 }
4966
4967 static inline int rt_scope(int ifa_scope)
4968 {
4969         if (ifa_scope & IFA_HOST)
4970                 return RT_SCOPE_HOST;
4971         else if (ifa_scope & IFA_LINK)
4972                 return RT_SCOPE_LINK;
4973         else if (ifa_scope & IFA_SITE)
4974                 return RT_SCOPE_SITE;
4975         else
4976                 return RT_SCOPE_UNIVERSE;
4977 }
4978
4979 static inline int inet6_ifaddr_msgsize(void)
4980 {
4981         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4982                + nla_total_size(16) /* IFA_LOCAL */
4983                + nla_total_size(16) /* IFA_ADDRESS */
4984                + nla_total_size(sizeof(struct ifa_cacheinfo))
4985                + nla_total_size(4)  /* IFA_FLAGS */
4986                + nla_total_size(1)  /* IFA_PROTO */
4987                + nla_total_size(4)  /* IFA_RT_PRIORITY */;
4988 }
4989
4990 enum addr_type_t {
4991         UNICAST_ADDR,
4992         MULTICAST_ADDR,
4993         ANYCAST_ADDR,
4994 };
4995
4996 struct inet6_fill_args {
4997         u32 portid;
4998         u32 seq;
4999         int event;
5000         unsigned int flags;
5001         int netnsid;
5002         int ifindex;
5003         enum addr_type_t type;
5004 };
5005
5006 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
5007                              struct inet6_fill_args *args)
5008 {
5009         struct nlmsghdr  *nlh;
5010         u32 preferred, valid;
5011
5012         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5013                         sizeof(struct ifaddrmsg), args->flags);
5014         if (!nlh)
5015                 return -EMSGSIZE;
5016
5017         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5018                       ifa->idev->dev->ifindex);
5019
5020         if (args->netnsid >= 0 &&
5021             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5022                 goto error;
5023
5024         spin_lock_bh(&ifa->lock);
5025         if (!((ifa->flags&IFA_F_PERMANENT) &&
5026               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5027                 preferred = ifa->prefered_lft;
5028                 valid = ifa->valid_lft;
5029                 if (preferred != INFINITY_LIFE_TIME) {
5030                         long tval = (jiffies - ifa->tstamp)/HZ;
5031                         if (preferred > tval)
5032                                 preferred -= tval;
5033                         else
5034                                 preferred = 0;
5035                         if (valid != INFINITY_LIFE_TIME) {
5036                                 if (valid > tval)
5037                                         valid -= tval;
5038                                 else
5039                                         valid = 0;
5040                         }
5041                 }
5042         } else {
5043                 preferred = INFINITY_LIFE_TIME;
5044                 valid = INFINITY_LIFE_TIME;
5045         }
5046         spin_unlock_bh(&ifa->lock);
5047
5048         if (!ipv6_addr_any(&ifa->peer_addr)) {
5049                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5050                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5051                         goto error;
5052         } else
5053                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5054                         goto error;
5055
5056         if (ifa->rt_priority &&
5057             nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5058                 goto error;
5059
5060         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5061                 goto error;
5062
5063         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5064                 goto error;
5065
5066         if (ifa->ifa_proto &&
5067             nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
5068                 goto error;
5069
5070         nlmsg_end(skb, nlh);
5071         return 0;
5072
5073 error:
5074         nlmsg_cancel(skb, nlh);
5075         return -EMSGSIZE;
5076 }
5077
5078 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5079                                struct inet6_fill_args *args)
5080 {
5081         struct nlmsghdr  *nlh;
5082         u8 scope = RT_SCOPE_UNIVERSE;
5083         int ifindex = ifmca->idev->dev->ifindex;
5084
5085         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5086                 scope = RT_SCOPE_SITE;
5087
5088         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5089                         sizeof(struct ifaddrmsg), args->flags);
5090         if (!nlh)
5091                 return -EMSGSIZE;
5092
5093         if (args->netnsid >= 0 &&
5094             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5095                 nlmsg_cancel(skb, nlh);
5096                 return -EMSGSIZE;
5097         }
5098
5099         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5100         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5101             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5102                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5103                 nlmsg_cancel(skb, nlh);
5104                 return -EMSGSIZE;
5105         }
5106
5107         nlmsg_end(skb, nlh);
5108         return 0;
5109 }
5110
5111 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5112                                struct inet6_fill_args *args)
5113 {
5114         struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5115         int ifindex = dev ? dev->ifindex : 1;
5116         struct nlmsghdr  *nlh;
5117         u8 scope = RT_SCOPE_UNIVERSE;
5118
5119         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5120                 scope = RT_SCOPE_SITE;
5121
5122         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5123                         sizeof(struct ifaddrmsg), args->flags);
5124         if (!nlh)
5125                 return -EMSGSIZE;
5126
5127         if (args->netnsid >= 0 &&
5128             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5129                 nlmsg_cancel(skb, nlh);
5130                 return -EMSGSIZE;
5131         }
5132
5133         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5134         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5135             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5136                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5137                 nlmsg_cancel(skb, nlh);
5138                 return -EMSGSIZE;
5139         }
5140
5141         nlmsg_end(skb, nlh);
5142         return 0;
5143 }
5144
5145 /* called with rcu_read_lock() */
5146 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5147                           struct netlink_callback *cb, int s_ip_idx,
5148                           struct inet6_fill_args *fillargs)
5149 {
5150         struct ifmcaddr6 *ifmca;
5151         struct ifacaddr6 *ifaca;
5152         int ip_idx = 0;
5153         int err = 1;
5154
5155         read_lock_bh(&idev->lock);
5156         switch (fillargs->type) {
5157         case UNICAST_ADDR: {
5158                 struct inet6_ifaddr *ifa;
5159                 fillargs->event = RTM_NEWADDR;
5160
5161                 /* unicast address incl. temp addr */
5162                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5163                         if (ip_idx < s_ip_idx)
5164                                 goto next;
5165                         err = inet6_fill_ifaddr(skb, ifa, fillargs);
5166                         if (err < 0)
5167                                 break;
5168                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5169 next:
5170                         ip_idx++;
5171                 }
5172                 break;
5173         }
5174         case MULTICAST_ADDR:
5175                 read_unlock_bh(&idev->lock);
5176                 fillargs->event = RTM_GETMULTICAST;
5177
5178                 /* multicast address */
5179                 for (ifmca = rtnl_dereference(idev->mc_list);
5180                      ifmca;
5181                      ifmca = rtnl_dereference(ifmca->next), ip_idx++) {
5182                         if (ip_idx < s_ip_idx)
5183                                 continue;
5184                         err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5185                         if (err < 0)
5186                                 break;
5187                 }
5188                 read_lock_bh(&idev->lock);
5189                 break;
5190         case ANYCAST_ADDR:
5191                 fillargs->event = RTM_GETANYCAST;
5192                 /* anycast address */
5193                 for (ifaca = idev->ac_list; ifaca;
5194                      ifaca = ifaca->aca_next, ip_idx++) {
5195                         if (ip_idx < s_ip_idx)
5196                                 continue;
5197                         err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5198                         if (err < 0)
5199                                 break;
5200                 }
5201                 break;
5202         default:
5203                 break;
5204         }
5205         read_unlock_bh(&idev->lock);
5206         cb->args[2] = ip_idx;
5207         return err;
5208 }
5209
5210 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5211                                        struct inet6_fill_args *fillargs,
5212                                        struct net **tgt_net, struct sock *sk,
5213                                        struct netlink_callback *cb)
5214 {
5215         struct netlink_ext_ack *extack = cb->extack;
5216         struct nlattr *tb[IFA_MAX+1];
5217         struct ifaddrmsg *ifm;
5218         int err, i;
5219
5220         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5221                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5222                 return -EINVAL;
5223         }
5224
5225         ifm = nlmsg_data(nlh);
5226         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5227                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5228                 return -EINVAL;
5229         }
5230
5231         fillargs->ifindex = ifm->ifa_index;
5232         if (fillargs->ifindex) {
5233                 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5234                 fillargs->flags |= NLM_F_DUMP_FILTERED;
5235         }
5236
5237         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5238                                             ifa_ipv6_policy, extack);
5239         if (err < 0)
5240                 return err;
5241
5242         for (i = 0; i <= IFA_MAX; ++i) {
5243                 if (!tb[i])
5244                         continue;
5245
5246                 if (i == IFA_TARGET_NETNSID) {
5247                         struct net *net;
5248
5249                         fillargs->netnsid = nla_get_s32(tb[i]);
5250                         net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5251                         if (IS_ERR(net)) {
5252                                 fillargs->netnsid = -1;
5253                                 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5254                                 return PTR_ERR(net);
5255                         }
5256                         *tgt_net = net;
5257                 } else {
5258                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5259                         return -EINVAL;
5260                 }
5261         }
5262
5263         return 0;
5264 }
5265
5266 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5267                            enum addr_type_t type)
5268 {
5269         const struct nlmsghdr *nlh = cb->nlh;
5270         struct inet6_fill_args fillargs = {
5271                 .portid = NETLINK_CB(cb->skb).portid,
5272                 .seq = cb->nlh->nlmsg_seq,
5273                 .flags = NLM_F_MULTI,
5274                 .netnsid = -1,
5275                 .type = type,
5276         };
5277         struct net *tgt_net = sock_net(skb->sk);
5278         int idx, s_idx, s_ip_idx;
5279         int h, s_h;
5280         struct net_device *dev;
5281         struct inet6_dev *idev;
5282         struct hlist_head *head;
5283         int err = 0;
5284
5285         s_h = cb->args[0];
5286         s_idx = idx = cb->args[1];
5287         s_ip_idx = cb->args[2];
5288
5289         if (cb->strict_check) {
5290                 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5291                                                   skb->sk, cb);
5292                 if (err < 0)
5293                         goto put_tgt_net;
5294
5295                 err = 0;
5296                 if (fillargs.ifindex) {
5297                         dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5298                         if (!dev) {
5299                                 err = -ENODEV;
5300                                 goto put_tgt_net;
5301                         }
5302                         idev = __in6_dev_get(dev);
5303                         if (idev) {
5304                                 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5305                                                      &fillargs);
5306                                 if (err > 0)
5307                                         err = 0;
5308                         }
5309                         goto put_tgt_net;
5310                 }
5311         }
5312
5313         rcu_read_lock();
5314         cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5315         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5316                 idx = 0;
5317                 head = &tgt_net->dev_index_head[h];
5318                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5319                         if (idx < s_idx)
5320                                 goto cont;
5321                         if (h > s_h || idx > s_idx)
5322                                 s_ip_idx = 0;
5323                         idev = __in6_dev_get(dev);
5324                         if (!idev)
5325                                 goto cont;
5326
5327                         if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5328                                            &fillargs) < 0)
5329                                 goto done;
5330 cont:
5331                         idx++;
5332                 }
5333         }
5334 done:
5335         rcu_read_unlock();
5336         cb->args[0] = h;
5337         cb->args[1] = idx;
5338 put_tgt_net:
5339         if (fillargs.netnsid >= 0)
5340                 put_net(tgt_net);
5341
5342         return skb->len ? : err;
5343 }
5344
5345 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5346 {
5347         enum addr_type_t type = UNICAST_ADDR;
5348
5349         return inet6_dump_addr(skb, cb, type);
5350 }
5351
5352 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5353 {
5354         enum addr_type_t type = MULTICAST_ADDR;
5355
5356         return inet6_dump_addr(skb, cb, type);
5357 }
5358
5359
5360 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5361 {
5362         enum addr_type_t type = ANYCAST_ADDR;
5363
5364         return inet6_dump_addr(skb, cb, type);
5365 }
5366
5367 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5368                                        const struct nlmsghdr *nlh,
5369                                        struct nlattr **tb,
5370                                        struct netlink_ext_ack *extack)
5371 {
5372         struct ifaddrmsg *ifm;
5373         int i, err;
5374
5375         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5376                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5377                 return -EINVAL;
5378         }
5379
5380         if (!netlink_strict_get_check(skb))
5381                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5382                                               ifa_ipv6_policy, extack);
5383
5384         ifm = nlmsg_data(nlh);
5385         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5386                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5387                 return -EINVAL;
5388         }
5389
5390         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5391                                             ifa_ipv6_policy, extack);
5392         if (err)
5393                 return err;
5394
5395         for (i = 0; i <= IFA_MAX; i++) {
5396                 if (!tb[i])
5397                         continue;
5398
5399                 switch (i) {
5400                 case IFA_TARGET_NETNSID:
5401                 case IFA_ADDRESS:
5402                 case IFA_LOCAL:
5403                         break;
5404                 default:
5405                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5406                         return -EINVAL;
5407                 }
5408         }
5409
5410         return 0;
5411 }
5412
5413 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5414                              struct netlink_ext_ack *extack)
5415 {
5416         struct net *tgt_net = sock_net(in_skb->sk);
5417         struct inet6_fill_args fillargs = {
5418                 .portid = NETLINK_CB(in_skb).portid,
5419                 .seq = nlh->nlmsg_seq,
5420                 .event = RTM_NEWADDR,
5421                 .flags = 0,
5422                 .netnsid = -1,
5423         };
5424         struct ifaddrmsg *ifm;
5425         struct nlattr *tb[IFA_MAX+1];
5426         struct in6_addr *addr = NULL, *peer;
5427         struct net_device *dev = NULL;
5428         struct inet6_ifaddr *ifa;
5429         struct sk_buff *skb;
5430         int err;
5431
5432         err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5433         if (err < 0)
5434                 return err;
5435
5436         if (tb[IFA_TARGET_NETNSID]) {
5437                 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5438
5439                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5440                                                   fillargs.netnsid);
5441                 if (IS_ERR(tgt_net))
5442                         return PTR_ERR(tgt_net);
5443         }
5444
5445         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5446         if (!addr)
5447                 return -EINVAL;
5448
5449         ifm = nlmsg_data(nlh);
5450         if (ifm->ifa_index)
5451                 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5452
5453         ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5454         if (!ifa) {
5455                 err = -EADDRNOTAVAIL;
5456                 goto errout;
5457         }
5458
5459         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5460         if (!skb) {
5461                 err = -ENOBUFS;
5462                 goto errout_ifa;
5463         }
5464
5465         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5466         if (err < 0) {
5467                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5468                 WARN_ON(err == -EMSGSIZE);
5469                 kfree_skb(skb);
5470                 goto errout_ifa;
5471         }
5472         err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5473 errout_ifa:
5474         in6_ifa_put(ifa);
5475 errout:
5476         dev_put(dev);
5477         if (fillargs.netnsid >= 0)
5478                 put_net(tgt_net);
5479
5480         return err;
5481 }
5482
5483 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5484 {
5485         struct sk_buff *skb;
5486         struct net *net = dev_net(ifa->idev->dev);
5487         struct inet6_fill_args fillargs = {
5488                 .portid = 0,
5489                 .seq = 0,
5490                 .event = event,
5491                 .flags = 0,
5492                 .netnsid = -1,
5493         };
5494         int err = -ENOBUFS;
5495
5496         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5497         if (!skb)
5498                 goto errout;
5499
5500         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5501         if (err < 0) {
5502                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5503                 WARN_ON(err == -EMSGSIZE);
5504                 kfree_skb(skb);
5505                 goto errout;
5506         }
5507         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5508         return;
5509 errout:
5510         if (err < 0)
5511                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5512 }
5513
5514 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5515                                 __s32 *array, int bytes)
5516 {
5517         BUG_ON(bytes < (DEVCONF_MAX * 4));
5518
5519         memset(array, 0, bytes);
5520         array[DEVCONF_FORWARDING] = cnf->forwarding;
5521         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5522         array[DEVCONF_MTU6] = cnf->mtu6;
5523         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5524         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5525         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5526         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5527         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5528         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5529                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5530         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5531                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5532         array[DEVCONF_RTR_SOLICIT_DELAY] =
5533                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5534         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5535         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5536                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5537         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5538                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5539         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5540         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5541         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5542         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5543         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5544         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5545         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5546         array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5547         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5548         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5549 #ifdef CONFIG_IPV6_ROUTER_PREF
5550         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5551         array[DEVCONF_RTR_PROBE_INTERVAL] =
5552                 jiffies_to_msecs(cnf->rtr_probe_interval);
5553 #ifdef CONFIG_IPV6_ROUTE_INFO
5554         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5555         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5556 #endif
5557 #endif
5558         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5559         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5560 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5561         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5562         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5563 #endif
5564 #ifdef CONFIG_IPV6_MROUTE
5565         array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5566 #endif
5567         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5568         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5569         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5570         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5571         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5572         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5573         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5574         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5575         /* we omit DEVCONF_STABLE_SECRET for now */
5576         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5577         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5578         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5579         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5580         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5581 #ifdef CONFIG_IPV6_SEG6_HMAC
5582         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5583 #endif
5584         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5585         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5586         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5587         array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5588         array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5589         array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5590         array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5591         array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5592         array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
5593         array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
5594 }
5595
5596 static inline size_t inet6_ifla6_size(void)
5597 {
5598         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5599              + nla_total_size(sizeof(struct ifla_cacheinfo))
5600              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5601              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5602              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5603              + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5604              + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5605              + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5606              + 0;
5607 }
5608
5609 static inline size_t inet6_if_nlmsg_size(void)
5610 {
5611         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5612                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5613                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5614                + nla_total_size(4) /* IFLA_MTU */
5615                + nla_total_size(4) /* IFLA_LINK */
5616                + nla_total_size(1) /* IFLA_OPERSTATE */
5617                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5618 }
5619
5620 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5621                                         int bytes)
5622 {
5623         int i;
5624         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5625         BUG_ON(pad < 0);
5626
5627         /* Use put_unaligned() because stats may not be aligned for u64. */
5628         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5629         for (i = 1; i < ICMP6_MIB_MAX; i++)
5630                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5631
5632         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5633 }
5634
5635 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5636                                         int bytes, size_t syncpoff)
5637 {
5638         int i, c;
5639         u64 buff[IPSTATS_MIB_MAX];
5640         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5641
5642         BUG_ON(pad < 0);
5643
5644         memset(buff, 0, sizeof(buff));
5645         buff[0] = IPSTATS_MIB_MAX;
5646
5647         for_each_possible_cpu(c) {
5648                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5649                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5650         }
5651
5652         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5653         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5654 }
5655
5656 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5657                              int bytes)
5658 {
5659         switch (attrtype) {
5660         case IFLA_INET6_STATS:
5661                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5662                                      offsetof(struct ipstats_mib, syncp));
5663                 break;
5664         case IFLA_INET6_ICMP6STATS:
5665                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5666                 break;
5667         }
5668 }
5669
5670 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5671                                   u32 ext_filter_mask)
5672 {
5673         struct nlattr *nla;
5674         struct ifla_cacheinfo ci;
5675
5676         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5677                 goto nla_put_failure;
5678         ci.max_reasm_len = IPV6_MAXPLEN;
5679         ci.tstamp = cstamp_delta(idev->tstamp);
5680         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5681         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5682         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5683                 goto nla_put_failure;
5684         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5685         if (!nla)
5686                 goto nla_put_failure;
5687         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5688
5689         /* XXX - MC not implemented */
5690
5691         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5692                 return 0;
5693
5694         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5695         if (!nla)
5696                 goto nla_put_failure;
5697         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5698
5699         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5700         if (!nla)
5701                 goto nla_put_failure;
5702         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5703
5704         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5705         if (!nla)
5706                 goto nla_put_failure;
5707         read_lock_bh(&idev->lock);
5708         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5709         read_unlock_bh(&idev->lock);
5710
5711         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5712                 goto nla_put_failure;
5713
5714         if (idev->ra_mtu &&
5715             nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5716                 goto nla_put_failure;
5717
5718         return 0;
5719
5720 nla_put_failure:
5721         return -EMSGSIZE;
5722 }
5723
5724 static size_t inet6_get_link_af_size(const struct net_device *dev,
5725                                      u32 ext_filter_mask)
5726 {
5727         if (!__in6_dev_get(dev))
5728                 return 0;
5729
5730         return inet6_ifla6_size();
5731 }
5732
5733 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5734                               u32 ext_filter_mask)
5735 {
5736         struct inet6_dev *idev = __in6_dev_get(dev);
5737
5738         if (!idev)
5739                 return -ENODATA;
5740
5741         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5742                 return -EMSGSIZE;
5743
5744         return 0;
5745 }
5746
5747 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5748                              struct netlink_ext_ack *extack)
5749 {
5750         struct inet6_ifaddr *ifp;
5751         struct net_device *dev = idev->dev;
5752         bool clear_token, update_rs = false;
5753         struct in6_addr ll_addr;
5754
5755         ASSERT_RTNL();
5756
5757         if (!token)
5758                 return -EINVAL;
5759
5760         if (dev->flags & IFF_LOOPBACK) {
5761                 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5762                 return -EINVAL;
5763         }
5764
5765         if (dev->flags & IFF_NOARP) {
5766                 NL_SET_ERR_MSG_MOD(extack,
5767                                    "Device does not do neighbour discovery");
5768                 return -EINVAL;
5769         }
5770
5771         if (!ipv6_accept_ra(idev)) {
5772                 NL_SET_ERR_MSG_MOD(extack,
5773                                    "Router advertisement is disabled on device");
5774                 return -EINVAL;
5775         }
5776
5777         if (idev->cnf.rtr_solicits == 0) {
5778                 NL_SET_ERR_MSG(extack,
5779                                "Router solicitation is disabled on device");
5780                 return -EINVAL;
5781         }
5782
5783         write_lock_bh(&idev->lock);
5784
5785         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5786         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5787
5788         write_unlock_bh(&idev->lock);
5789
5790         clear_token = ipv6_addr_any(token);
5791         if (clear_token)
5792                 goto update_lft;
5793
5794         if (!idev->dead && (idev->if_flags & IF_READY) &&
5795             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5796                              IFA_F_OPTIMISTIC)) {
5797                 /* If we're not ready, then normal ifup will take care
5798                  * of this. Otherwise, we need to request our rs here.
5799                  */
5800                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5801                 update_rs = true;
5802         }
5803
5804 update_lft:
5805         write_lock_bh(&idev->lock);
5806
5807         if (update_rs) {
5808                 idev->if_flags |= IF_RS_SENT;
5809                 idev->rs_interval = rfc3315_s14_backoff_init(
5810                         idev->cnf.rtr_solicit_interval);
5811                 idev->rs_probes = 1;
5812                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5813         }
5814
5815         /* Well, that's kinda nasty ... */
5816         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5817                 spin_lock(&ifp->lock);
5818                 if (ifp->tokenized) {
5819                         ifp->valid_lft = 0;
5820                         ifp->prefered_lft = 0;
5821                 }
5822                 spin_unlock(&ifp->lock);
5823         }
5824
5825         write_unlock_bh(&idev->lock);
5826         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5827         addrconf_verify_rtnl(dev_net(dev));
5828         return 0;
5829 }
5830
5831 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5832         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5833         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5834         [IFLA_INET6_RA_MTU]             = { .type = NLA_REJECT,
5835                                             .reject_message =
5836                                                 "IFLA_INET6_RA_MTU can not be set" },
5837 };
5838
5839 static int check_addr_gen_mode(int mode)
5840 {
5841         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5842             mode != IN6_ADDR_GEN_MODE_NONE &&
5843             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5844             mode != IN6_ADDR_GEN_MODE_RANDOM)
5845                 return -EINVAL;
5846         return 1;
5847 }
5848
5849 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5850                                 int mode)
5851 {
5852         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5853             !idev->cnf.stable_secret.initialized &&
5854             !net->ipv6.devconf_dflt->stable_secret.initialized)
5855                 return -EINVAL;
5856         return 1;
5857 }
5858
5859 static int inet6_validate_link_af(const struct net_device *dev,
5860                                   const struct nlattr *nla,
5861                                   struct netlink_ext_ack *extack)
5862 {
5863         struct nlattr *tb[IFLA_INET6_MAX + 1];
5864         struct inet6_dev *idev = NULL;
5865         int err;
5866
5867         if (dev) {
5868                 idev = __in6_dev_get(dev);
5869                 if (!idev)
5870                         return -EAFNOSUPPORT;
5871         }
5872
5873         err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5874                                           inet6_af_policy, extack);
5875         if (err)
5876                 return err;
5877
5878         if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5879                 return -EINVAL;
5880
5881         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5882                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5883
5884                 if (check_addr_gen_mode(mode) < 0)
5885                         return -EINVAL;
5886                 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5887                         return -EINVAL;
5888         }
5889
5890         return 0;
5891 }
5892
5893 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5894                              struct netlink_ext_ack *extack)
5895 {
5896         struct inet6_dev *idev = __in6_dev_get(dev);
5897         struct nlattr *tb[IFLA_INET6_MAX + 1];
5898         int err;
5899
5900         if (!idev)
5901                 return -EAFNOSUPPORT;
5902
5903         if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5904                 return -EINVAL;
5905
5906         if (tb[IFLA_INET6_TOKEN]) {
5907                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5908                                         extack);
5909                 if (err)
5910                         return err;
5911         }
5912
5913         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5914                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5915
5916                 idev->cnf.addr_gen_mode = mode;
5917         }
5918
5919         return 0;
5920 }
5921
5922 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5923                              u32 portid, u32 seq, int event, unsigned int flags)
5924 {
5925         struct net_device *dev = idev->dev;
5926         struct ifinfomsg *hdr;
5927         struct nlmsghdr *nlh;
5928         void *protoinfo;
5929
5930         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5931         if (!nlh)
5932                 return -EMSGSIZE;
5933
5934         hdr = nlmsg_data(nlh);
5935         hdr->ifi_family = AF_INET6;
5936         hdr->__ifi_pad = 0;
5937         hdr->ifi_type = dev->type;
5938         hdr->ifi_index = dev->ifindex;
5939         hdr->ifi_flags = dev_get_flags(dev);
5940         hdr->ifi_change = 0;
5941
5942         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5943             (dev->addr_len &&
5944              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5945             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5946             (dev->ifindex != dev_get_iflink(dev) &&
5947              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5948             nla_put_u8(skb, IFLA_OPERSTATE,
5949                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5950                 goto nla_put_failure;
5951         protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5952         if (!protoinfo)
5953                 goto nla_put_failure;
5954
5955         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5956                 goto nla_put_failure;
5957
5958         nla_nest_end(skb, protoinfo);
5959         nlmsg_end(skb, nlh);
5960         return 0;
5961
5962 nla_put_failure:
5963         nlmsg_cancel(skb, nlh);
5964         return -EMSGSIZE;
5965 }
5966
5967 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5968                                    struct netlink_ext_ack *extack)
5969 {
5970         struct ifinfomsg *ifm;
5971
5972         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5973                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5974                 return -EINVAL;
5975         }
5976
5977         if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5978                 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5979                 return -EINVAL;
5980         }
5981
5982         ifm = nlmsg_data(nlh);
5983         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5984             ifm->ifi_change || ifm->ifi_index) {
5985                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5986                 return -EINVAL;
5987         }
5988
5989         return 0;
5990 }
5991
5992 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5993 {
5994         struct net *net = sock_net(skb->sk);
5995         int h, s_h;
5996         int idx = 0, s_idx;
5997         struct net_device *dev;
5998         struct inet6_dev *idev;
5999         struct hlist_head *head;
6000
6001         /* only requests using strict checking can pass data to
6002          * influence the dump
6003          */
6004         if (cb->strict_check) {
6005                 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6006
6007                 if (err < 0)
6008                         return err;
6009         }
6010
6011         s_h = cb->args[0];
6012         s_idx = cb->args[1];
6013
6014         rcu_read_lock();
6015         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6016                 idx = 0;
6017                 head = &net->dev_index_head[h];
6018                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
6019                         if (idx < s_idx)
6020                                 goto cont;
6021                         idev = __in6_dev_get(dev);
6022                         if (!idev)
6023                                 goto cont;
6024                         if (inet6_fill_ifinfo(skb, idev,
6025                                               NETLINK_CB(cb->skb).portid,
6026                                               cb->nlh->nlmsg_seq,
6027                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
6028                                 goto out;
6029 cont:
6030                         idx++;
6031                 }
6032         }
6033 out:
6034         rcu_read_unlock();
6035         cb->args[1] = idx;
6036         cb->args[0] = h;
6037
6038         return skb->len;
6039 }
6040
6041 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6042 {
6043         struct sk_buff *skb;
6044         struct net *net = dev_net(idev->dev);
6045         int err = -ENOBUFS;
6046
6047         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6048         if (!skb)
6049                 goto errout;
6050
6051         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6052         if (err < 0) {
6053                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6054                 WARN_ON(err == -EMSGSIZE);
6055                 kfree_skb(skb);
6056                 goto errout;
6057         }
6058         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6059         return;
6060 errout:
6061         if (err < 0)
6062                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6063 }
6064
6065 static inline size_t inet6_prefix_nlmsg_size(void)
6066 {
6067         return NLMSG_ALIGN(sizeof(struct prefixmsg))
6068                + nla_total_size(sizeof(struct in6_addr))
6069                + nla_total_size(sizeof(struct prefix_cacheinfo));
6070 }
6071
6072 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6073                              struct prefix_info *pinfo, u32 portid, u32 seq,
6074                              int event, unsigned int flags)
6075 {
6076         struct prefixmsg *pmsg;
6077         struct nlmsghdr *nlh;
6078         struct prefix_cacheinfo ci;
6079
6080         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6081         if (!nlh)
6082                 return -EMSGSIZE;
6083
6084         pmsg = nlmsg_data(nlh);
6085         pmsg->prefix_family = AF_INET6;
6086         pmsg->prefix_pad1 = 0;
6087         pmsg->prefix_pad2 = 0;
6088         pmsg->prefix_ifindex = idev->dev->ifindex;
6089         pmsg->prefix_len = pinfo->prefix_len;
6090         pmsg->prefix_type = pinfo->type;
6091         pmsg->prefix_pad3 = 0;
6092         pmsg->prefix_flags = 0;
6093         if (pinfo->onlink)
6094                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6095         if (pinfo->autoconf)
6096                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6097
6098         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6099                 goto nla_put_failure;
6100         ci.preferred_time = ntohl(pinfo->prefered);
6101         ci.valid_time = ntohl(pinfo->valid);
6102         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6103                 goto nla_put_failure;
6104         nlmsg_end(skb, nlh);
6105         return 0;
6106
6107 nla_put_failure:
6108         nlmsg_cancel(skb, nlh);
6109         return -EMSGSIZE;
6110 }
6111
6112 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6113                          struct prefix_info *pinfo)
6114 {
6115         struct sk_buff *skb;
6116         struct net *net = dev_net(idev->dev);
6117         int err = -ENOBUFS;
6118
6119         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6120         if (!skb)
6121                 goto errout;
6122
6123         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6124         if (err < 0) {
6125                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6126                 WARN_ON(err == -EMSGSIZE);
6127                 kfree_skb(skb);
6128                 goto errout;
6129         }
6130         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6131         return;
6132 errout:
6133         if (err < 0)
6134                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6135 }
6136
6137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6138 {
6139         struct net *net = dev_net(ifp->idev->dev);
6140
6141         if (event)
6142                 ASSERT_RTNL();
6143
6144         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6145
6146         switch (event) {
6147         case RTM_NEWADDR:
6148                 /*
6149                  * If the address was optimistic we inserted the route at the
6150                  * start of our DAD process, so we don't need to do it again.
6151                  * If the device was taken down in the middle of the DAD
6152                  * cycle there is a race where we could get here without a
6153                  * host route, so nothing to insert. That will be fixed when
6154                  * the device is brought up.
6155                  */
6156                 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6157                         ip6_ins_rt(net, ifp->rt);
6158                 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6159                         pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6160                                 &ifp->addr, ifp->idev->dev->name);
6161                 }
6162
6163                 if (ifp->idev->cnf.forwarding)
6164                         addrconf_join_anycast(ifp);
6165                 if (!ipv6_addr_any(&ifp->peer_addr))
6166                         addrconf_prefix_route(&ifp->peer_addr, 128,
6167                                               ifp->rt_priority, ifp->idev->dev,
6168                                               0, 0, GFP_ATOMIC);
6169                 break;
6170         case RTM_DELADDR:
6171                 if (ifp->idev->cnf.forwarding)
6172                         addrconf_leave_anycast(ifp);
6173                 addrconf_leave_solict(ifp->idev, &ifp->addr);
6174                 if (!ipv6_addr_any(&ifp->peer_addr)) {
6175                         struct fib6_info *rt;
6176
6177                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6178                                                        ifp->idev->dev, 0, 0,
6179                                                        false);
6180                         if (rt)
6181                                 ip6_del_rt(net, rt, false);
6182                 }
6183                 if (ifp->rt) {
6184                         ip6_del_rt(net, ifp->rt, false);
6185                         ifp->rt = NULL;
6186                 }
6187                 rt_genid_bump_ipv6(net);
6188                 break;
6189         }
6190         atomic_inc(&net->ipv6.dev_addr_genid);
6191 }
6192
6193 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6194 {
6195         if (likely(ifp->idev->dead == 0))
6196                 __ipv6_ifa_notify(event, ifp);
6197 }
6198
6199 #ifdef CONFIG_SYSCTL
6200
6201 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6202                 void *buffer, size_t *lenp, loff_t *ppos)
6203 {
6204         int *valp = ctl->data;
6205         int val = *valp;
6206         loff_t pos = *ppos;
6207         struct ctl_table lctl;
6208         int ret;
6209
6210         /*
6211          * ctl->data points to idev->cnf.forwarding, we should
6212          * not modify it until we get the rtnl lock.
6213          */
6214         lctl = *ctl;
6215         lctl.data = &val;
6216
6217         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6218
6219         if (write)
6220                 ret = addrconf_fixup_forwarding(ctl, valp, val);
6221         if (ret)
6222                 *ppos = pos;
6223         return ret;
6224 }
6225
6226 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6227                 void *buffer, size_t *lenp, loff_t *ppos)
6228 {
6229         struct inet6_dev *idev = ctl->extra1;
6230         int min_mtu = IPV6_MIN_MTU;
6231         struct ctl_table lctl;
6232
6233         lctl = *ctl;
6234         lctl.extra1 = &min_mtu;
6235         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6236
6237         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6238 }
6239
6240 static void dev_disable_change(struct inet6_dev *idev)
6241 {
6242         struct netdev_notifier_info info;
6243
6244         if (!idev || !idev->dev)
6245                 return;
6246
6247         netdev_notifier_info_init(&info, idev->dev);
6248         if (idev->cnf.disable_ipv6)
6249                 addrconf_notify(NULL, NETDEV_DOWN, &info);
6250         else
6251                 addrconf_notify(NULL, NETDEV_UP, &info);
6252 }
6253
6254 static void addrconf_disable_change(struct net *net, __s32 newf)
6255 {
6256         struct net_device *dev;
6257         struct inet6_dev *idev;
6258
6259         for_each_netdev(net, dev) {
6260                 idev = __in6_dev_get(dev);
6261                 if (idev) {
6262                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6263                         idev->cnf.disable_ipv6 = newf;
6264                         if (changed)
6265                                 dev_disable_change(idev);
6266                 }
6267         }
6268 }
6269
6270 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6271 {
6272         struct net *net;
6273         int old;
6274
6275         if (!rtnl_trylock())
6276                 return restart_syscall();
6277
6278         net = (struct net *)table->extra2;
6279         old = *p;
6280         *p = newf;
6281
6282         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6283                 rtnl_unlock();
6284                 return 0;
6285         }
6286
6287         if (p == &net->ipv6.devconf_all->disable_ipv6) {
6288                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6289                 addrconf_disable_change(net, newf);
6290         } else if ((!newf) ^ (!old))
6291                 dev_disable_change((struct inet6_dev *)table->extra1);
6292
6293         rtnl_unlock();
6294         return 0;
6295 }
6296
6297 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6298                 void *buffer, size_t *lenp, loff_t *ppos)
6299 {
6300         int *valp = ctl->data;
6301         int val = *valp;
6302         loff_t pos = *ppos;
6303         struct ctl_table lctl;
6304         int ret;
6305
6306         /*
6307          * ctl->data points to idev->cnf.disable_ipv6, we should
6308          * not modify it until we get the rtnl lock.
6309          */
6310         lctl = *ctl;
6311         lctl.data = &val;
6312
6313         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6314
6315         if (write)
6316                 ret = addrconf_disable_ipv6(ctl, valp, val);
6317         if (ret)
6318                 *ppos = pos;
6319         return ret;
6320 }
6321
6322 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6323                 void *buffer, size_t *lenp, loff_t *ppos)
6324 {
6325         int *valp = ctl->data;
6326         int ret;
6327         int old, new;
6328
6329         old = *valp;
6330         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6331         new = *valp;
6332
6333         if (write && old != new) {
6334                 struct net *net = ctl->extra2;
6335
6336                 if (!rtnl_trylock())
6337                         return restart_syscall();
6338
6339                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6340                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6341                                                      NETCONFA_PROXY_NEIGH,
6342                                                      NETCONFA_IFINDEX_DEFAULT,
6343                                                      net->ipv6.devconf_dflt);
6344                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6345                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6346                                                      NETCONFA_PROXY_NEIGH,
6347                                                      NETCONFA_IFINDEX_ALL,
6348                                                      net->ipv6.devconf_all);
6349                 else {
6350                         struct inet6_dev *idev = ctl->extra1;
6351
6352                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6353                                                      NETCONFA_PROXY_NEIGH,
6354                                                      idev->dev->ifindex,
6355                                                      &idev->cnf);
6356                 }
6357                 rtnl_unlock();
6358         }
6359
6360         return ret;
6361 }
6362
6363 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6364                                          void *buffer, size_t *lenp,
6365                                          loff_t *ppos)
6366 {
6367         int ret = 0;
6368         u32 new_val;
6369         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6370         struct net *net = (struct net *)ctl->extra2;
6371         struct ctl_table tmp = {
6372                 .data = &new_val,
6373                 .maxlen = sizeof(new_val),
6374                 .mode = ctl->mode,
6375         };
6376
6377         if (!rtnl_trylock())
6378                 return restart_syscall();
6379
6380         new_val = *((u32 *)ctl->data);
6381
6382         ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6383         if (ret != 0)
6384                 goto out;
6385
6386         if (write) {
6387                 if (check_addr_gen_mode(new_val) < 0) {
6388                         ret = -EINVAL;
6389                         goto out;
6390                 }
6391
6392                 if (idev) {
6393                         if (check_stable_privacy(idev, net, new_val) < 0) {
6394                                 ret = -EINVAL;
6395                                 goto out;
6396                         }
6397
6398                         if (idev->cnf.addr_gen_mode != new_val) {
6399                                 idev->cnf.addr_gen_mode = new_val;
6400                                 addrconf_dev_config(idev->dev);
6401                         }
6402                 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6403                         struct net_device *dev;
6404
6405                         net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6406                         for_each_netdev(net, dev) {
6407                                 idev = __in6_dev_get(dev);
6408                                 if (idev &&
6409                                     idev->cnf.addr_gen_mode != new_val) {
6410                                         idev->cnf.addr_gen_mode = new_val;
6411                                         addrconf_dev_config(idev->dev);
6412                                 }
6413                         }
6414                 }
6415
6416                 *((u32 *)ctl->data) = new_val;
6417         }
6418
6419 out:
6420         rtnl_unlock();
6421
6422         return ret;
6423 }
6424
6425 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6426                                          void *buffer, size_t *lenp,
6427                                          loff_t *ppos)
6428 {
6429         int err;
6430         struct in6_addr addr;
6431         char str[IPV6_MAX_STRLEN];
6432         struct ctl_table lctl = *ctl;
6433         struct net *net = ctl->extra2;
6434         struct ipv6_stable_secret *secret = ctl->data;
6435
6436         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6437                 return -EIO;
6438
6439         lctl.maxlen = IPV6_MAX_STRLEN;
6440         lctl.data = str;
6441
6442         if (!rtnl_trylock())
6443                 return restart_syscall();
6444
6445         if (!write && !secret->initialized) {
6446                 err = -EIO;
6447                 goto out;
6448         }
6449
6450         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6451         if (err >= sizeof(str)) {
6452                 err = -EIO;
6453                 goto out;
6454         }
6455
6456         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6457         if (err || !write)
6458                 goto out;
6459
6460         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6461                 err = -EIO;
6462                 goto out;
6463         }
6464
6465         secret->initialized = true;
6466         secret->secret = addr;
6467
6468         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6469                 struct net_device *dev;
6470
6471                 for_each_netdev(net, dev) {
6472                         struct inet6_dev *idev = __in6_dev_get(dev);
6473
6474                         if (idev) {
6475                                 idev->cnf.addr_gen_mode =
6476                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6477                         }
6478                 }
6479         } else {
6480                 struct inet6_dev *idev = ctl->extra1;
6481
6482                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6483         }
6484
6485 out:
6486         rtnl_unlock();
6487
6488         return err;
6489 }
6490
6491 static
6492 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6493                                                 int write, void *buffer,
6494                                                 size_t *lenp,
6495                                                 loff_t *ppos)
6496 {
6497         int *valp = ctl->data;
6498         int val = *valp;
6499         loff_t pos = *ppos;
6500         struct ctl_table lctl;
6501         int ret;
6502
6503         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6504          * we should not modify it until we get the rtnl lock.
6505          */
6506         lctl = *ctl;
6507         lctl.data = &val;
6508
6509         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6510
6511         if (write)
6512                 ret = addrconf_fixup_linkdown(ctl, valp, val);
6513         if (ret)
6514                 *ppos = pos;
6515         return ret;
6516 }
6517
6518 static
6519 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6520 {
6521         if (rt) {
6522                 if (action)
6523                         rt->dst.flags |= DST_NOPOLICY;
6524                 else
6525                         rt->dst.flags &= ~DST_NOPOLICY;
6526         }
6527 }
6528
6529 static
6530 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6531 {
6532         struct inet6_ifaddr *ifa;
6533
6534         read_lock_bh(&idev->lock);
6535         list_for_each_entry(ifa, &idev->addr_list, if_list) {
6536                 spin_lock(&ifa->lock);
6537                 if (ifa->rt) {
6538                         /* host routes only use builtin fib6_nh */
6539                         struct fib6_nh *nh = ifa->rt->fib6_nh;
6540                         int cpu;
6541
6542                         rcu_read_lock();
6543                         ifa->rt->dst_nopolicy = val ? true : false;
6544                         if (nh->rt6i_pcpu) {
6545                                 for_each_possible_cpu(cpu) {
6546                                         struct rt6_info **rtp;
6547
6548                                         rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6549                                         addrconf_set_nopolicy(*rtp, val);
6550                                 }
6551                         }
6552                         rcu_read_unlock();
6553                 }
6554                 spin_unlock(&ifa->lock);
6555         }
6556         read_unlock_bh(&idev->lock);
6557 }
6558
6559 static
6560 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6561 {
6562         struct inet6_dev *idev;
6563         struct net *net;
6564
6565         if (!rtnl_trylock())
6566                 return restart_syscall();
6567
6568         *valp = val;
6569
6570         net = (struct net *)ctl->extra2;
6571         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6572                 rtnl_unlock();
6573                 return 0;
6574         }
6575
6576         if (valp == &net->ipv6.devconf_all->disable_policy)  {
6577                 struct net_device *dev;
6578
6579                 for_each_netdev(net, dev) {
6580                         idev = __in6_dev_get(dev);
6581                         if (idev)
6582                                 addrconf_disable_policy_idev(idev, val);
6583                 }
6584         } else {
6585                 idev = (struct inet6_dev *)ctl->extra1;
6586                 addrconf_disable_policy_idev(idev, val);
6587         }
6588
6589         rtnl_unlock();
6590         return 0;
6591 }
6592
6593 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6594                                    void *buffer, size_t *lenp, loff_t *ppos)
6595 {
6596         int *valp = ctl->data;
6597         int val = *valp;
6598         loff_t pos = *ppos;
6599         struct ctl_table lctl;
6600         int ret;
6601
6602         lctl = *ctl;
6603         lctl.data = &val;
6604         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6605
6606         if (write && (*valp != val))
6607                 ret = addrconf_disable_policy(ctl, valp, val);
6608
6609         if (ret)
6610                 *ppos = pos;
6611
6612         return ret;
6613 }
6614
6615 static int minus_one = -1;
6616 static const int two_five_five = 255;
6617 static u32 ioam6_if_id_max = U16_MAX;
6618
6619 static const struct ctl_table addrconf_sysctl[] = {
6620         {
6621                 .procname       = "forwarding",
6622                 .data           = &ipv6_devconf.forwarding,
6623                 .maxlen         = sizeof(int),
6624                 .mode           = 0644,
6625                 .proc_handler   = addrconf_sysctl_forward,
6626         },
6627         {
6628                 .procname       = "hop_limit",
6629                 .data           = &ipv6_devconf.hop_limit,
6630                 .maxlen         = sizeof(int),
6631                 .mode           = 0644,
6632                 .proc_handler   = proc_dointvec_minmax,
6633                 .extra1         = (void *)SYSCTL_ONE,
6634                 .extra2         = (void *)&two_five_five,
6635         },
6636         {
6637                 .procname       = "mtu",
6638                 .data           = &ipv6_devconf.mtu6,
6639                 .maxlen         = sizeof(int),
6640                 .mode           = 0644,
6641                 .proc_handler   = addrconf_sysctl_mtu,
6642         },
6643         {
6644                 .procname       = "accept_ra",
6645                 .data           = &ipv6_devconf.accept_ra,
6646                 .maxlen         = sizeof(int),
6647                 .mode           = 0644,
6648                 .proc_handler   = proc_dointvec,
6649         },
6650         {
6651                 .procname       = "accept_redirects",
6652                 .data           = &ipv6_devconf.accept_redirects,
6653                 .maxlen         = sizeof(int),
6654                 .mode           = 0644,
6655                 .proc_handler   = proc_dointvec,
6656         },
6657         {
6658                 .procname       = "autoconf",
6659                 .data           = &ipv6_devconf.autoconf,
6660                 .maxlen         = sizeof(int),
6661                 .mode           = 0644,
6662                 .proc_handler   = proc_dointvec,
6663         },
6664         {
6665                 .procname       = "dad_transmits",
6666                 .data           = &ipv6_devconf.dad_transmits,
6667                 .maxlen         = sizeof(int),
6668                 .mode           = 0644,
6669                 .proc_handler   = proc_dointvec,
6670         },
6671         {
6672                 .procname       = "router_solicitations",
6673                 .data           = &ipv6_devconf.rtr_solicits,
6674                 .maxlen         = sizeof(int),
6675                 .mode           = 0644,
6676                 .proc_handler   = proc_dointvec_minmax,
6677                 .extra1         = &minus_one,
6678         },
6679         {
6680                 .procname       = "router_solicitation_interval",
6681                 .data           = &ipv6_devconf.rtr_solicit_interval,
6682                 .maxlen         = sizeof(int),
6683                 .mode           = 0644,
6684                 .proc_handler   = proc_dointvec_jiffies,
6685         },
6686         {
6687                 .procname       = "router_solicitation_max_interval",
6688                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6689                 .maxlen         = sizeof(int),
6690                 .mode           = 0644,
6691                 .proc_handler   = proc_dointvec_jiffies,
6692         },
6693         {
6694                 .procname       = "router_solicitation_delay",
6695                 .data           = &ipv6_devconf.rtr_solicit_delay,
6696                 .maxlen         = sizeof(int),
6697                 .mode           = 0644,
6698                 .proc_handler   = proc_dointvec_jiffies,
6699         },
6700         {
6701                 .procname       = "force_mld_version",
6702                 .data           = &ipv6_devconf.force_mld_version,
6703                 .maxlen         = sizeof(int),
6704                 .mode           = 0644,
6705                 .proc_handler   = proc_dointvec,
6706         },
6707         {
6708                 .procname       = "mldv1_unsolicited_report_interval",
6709                 .data           =
6710                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6711                 .maxlen         = sizeof(int),
6712                 .mode           = 0644,
6713                 .proc_handler   = proc_dointvec_ms_jiffies,
6714         },
6715         {
6716                 .procname       = "mldv2_unsolicited_report_interval",
6717                 .data           =
6718                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6719                 .maxlen         = sizeof(int),
6720                 .mode           = 0644,
6721                 .proc_handler   = proc_dointvec_ms_jiffies,
6722         },
6723         {
6724                 .procname       = "use_tempaddr",
6725                 .data           = &ipv6_devconf.use_tempaddr,
6726                 .maxlen         = sizeof(int),
6727                 .mode           = 0644,
6728                 .proc_handler   = proc_dointvec,
6729         },
6730         {
6731                 .procname       = "temp_valid_lft",
6732                 .data           = &ipv6_devconf.temp_valid_lft,
6733                 .maxlen         = sizeof(int),
6734                 .mode           = 0644,
6735                 .proc_handler   = proc_dointvec,
6736         },
6737         {
6738                 .procname       = "temp_prefered_lft",
6739                 .data           = &ipv6_devconf.temp_prefered_lft,
6740                 .maxlen         = sizeof(int),
6741                 .mode           = 0644,
6742                 .proc_handler   = proc_dointvec,
6743         },
6744         {
6745                 .procname       = "regen_max_retry",
6746                 .data           = &ipv6_devconf.regen_max_retry,
6747                 .maxlen         = sizeof(int),
6748                 .mode           = 0644,
6749                 .proc_handler   = proc_dointvec,
6750         },
6751         {
6752                 .procname       = "max_desync_factor",
6753                 .data           = &ipv6_devconf.max_desync_factor,
6754                 .maxlen         = sizeof(int),
6755                 .mode           = 0644,
6756                 .proc_handler   = proc_dointvec,
6757         },
6758         {
6759                 .procname       = "max_addresses",
6760                 .data           = &ipv6_devconf.max_addresses,
6761                 .maxlen         = sizeof(int),
6762                 .mode           = 0644,
6763                 .proc_handler   = proc_dointvec,
6764         },
6765         {
6766                 .procname       = "accept_ra_defrtr",
6767                 .data           = &ipv6_devconf.accept_ra_defrtr,
6768                 .maxlen         = sizeof(int),
6769                 .mode           = 0644,
6770                 .proc_handler   = proc_dointvec,
6771         },
6772         {
6773                 .procname       = "ra_defrtr_metric",
6774                 .data           = &ipv6_devconf.ra_defrtr_metric,
6775                 .maxlen         = sizeof(u32),
6776                 .mode           = 0644,
6777                 .proc_handler   = proc_douintvec_minmax,
6778                 .extra1         = (void *)SYSCTL_ONE,
6779         },
6780         {
6781                 .procname       = "accept_ra_min_hop_limit",
6782                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6783                 .maxlen         = sizeof(int),
6784                 .mode           = 0644,
6785                 .proc_handler   = proc_dointvec,
6786         },
6787         {
6788                 .procname       = "accept_ra_pinfo",
6789                 .data           = &ipv6_devconf.accept_ra_pinfo,
6790                 .maxlen         = sizeof(int),
6791                 .mode           = 0644,
6792                 .proc_handler   = proc_dointvec,
6793         },
6794 #ifdef CONFIG_IPV6_ROUTER_PREF
6795         {
6796                 .procname       = "accept_ra_rtr_pref",
6797                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6798                 .maxlen         = sizeof(int),
6799                 .mode           = 0644,
6800                 .proc_handler   = proc_dointvec,
6801         },
6802         {
6803                 .procname       = "router_probe_interval",
6804                 .data           = &ipv6_devconf.rtr_probe_interval,
6805                 .maxlen         = sizeof(int),
6806                 .mode           = 0644,
6807                 .proc_handler   = proc_dointvec_jiffies,
6808         },
6809 #ifdef CONFIG_IPV6_ROUTE_INFO
6810         {
6811                 .procname       = "accept_ra_rt_info_min_plen",
6812                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6813                 .maxlen         = sizeof(int),
6814                 .mode           = 0644,
6815                 .proc_handler   = proc_dointvec,
6816         },
6817         {
6818                 .procname       = "accept_ra_rt_info_max_plen",
6819                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6820                 .maxlen         = sizeof(int),
6821                 .mode           = 0644,
6822                 .proc_handler   = proc_dointvec,
6823         },
6824 #endif
6825 #endif
6826         {
6827                 .procname       = "proxy_ndp",
6828                 .data           = &ipv6_devconf.proxy_ndp,
6829                 .maxlen         = sizeof(int),
6830                 .mode           = 0644,
6831                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6832         },
6833         {
6834                 .procname       = "accept_source_route",
6835                 .data           = &ipv6_devconf.accept_source_route,
6836                 .maxlen         = sizeof(int),
6837                 .mode           = 0644,
6838                 .proc_handler   = proc_dointvec,
6839         },
6840 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6841         {
6842                 .procname       = "optimistic_dad",
6843                 .data           = &ipv6_devconf.optimistic_dad,
6844                 .maxlen         = sizeof(int),
6845                 .mode           = 0644,
6846                 .proc_handler   = proc_dointvec,
6847         },
6848         {
6849                 .procname       = "use_optimistic",
6850                 .data           = &ipv6_devconf.use_optimistic,
6851                 .maxlen         = sizeof(int),
6852                 .mode           = 0644,
6853                 .proc_handler   = proc_dointvec,
6854         },
6855 #endif
6856 #ifdef CONFIG_IPV6_MROUTE
6857         {
6858                 .procname       = "mc_forwarding",
6859                 .data           = &ipv6_devconf.mc_forwarding,
6860                 .maxlen         = sizeof(int),
6861                 .mode           = 0444,
6862                 .proc_handler   = proc_dointvec,
6863         },
6864 #endif
6865         {
6866                 .procname       = "disable_ipv6",
6867                 .data           = &ipv6_devconf.disable_ipv6,
6868                 .maxlen         = sizeof(int),
6869                 .mode           = 0644,
6870                 .proc_handler   = addrconf_sysctl_disable,
6871         },
6872         {
6873                 .procname       = "accept_dad",
6874                 .data           = &ipv6_devconf.accept_dad,
6875                 .maxlen         = sizeof(int),
6876                 .mode           = 0644,
6877                 .proc_handler   = proc_dointvec,
6878         },
6879         {
6880                 .procname       = "force_tllao",
6881                 .data           = &ipv6_devconf.force_tllao,
6882                 .maxlen         = sizeof(int),
6883                 .mode           = 0644,
6884                 .proc_handler   = proc_dointvec
6885         },
6886         {
6887                 .procname       = "ndisc_notify",
6888                 .data           = &ipv6_devconf.ndisc_notify,
6889                 .maxlen         = sizeof(int),
6890                 .mode           = 0644,
6891                 .proc_handler   = proc_dointvec
6892         },
6893         {
6894                 .procname       = "suppress_frag_ndisc",
6895                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6896                 .maxlen         = sizeof(int),
6897                 .mode           = 0644,
6898                 .proc_handler   = proc_dointvec
6899         },
6900         {
6901                 .procname       = "accept_ra_from_local",
6902                 .data           = &ipv6_devconf.accept_ra_from_local,
6903                 .maxlen         = sizeof(int),
6904                 .mode           = 0644,
6905                 .proc_handler   = proc_dointvec,
6906         },
6907         {
6908                 .procname       = "accept_ra_mtu",
6909                 .data           = &ipv6_devconf.accept_ra_mtu,
6910                 .maxlen         = sizeof(int),
6911                 .mode           = 0644,
6912                 .proc_handler   = proc_dointvec,
6913         },
6914         {
6915                 .procname       = "stable_secret",
6916                 .data           = &ipv6_devconf.stable_secret,
6917                 .maxlen         = IPV6_MAX_STRLEN,
6918                 .mode           = 0600,
6919                 .proc_handler   = addrconf_sysctl_stable_secret,
6920         },
6921         {
6922                 .procname       = "use_oif_addrs_only",
6923                 .data           = &ipv6_devconf.use_oif_addrs_only,
6924                 .maxlen         = sizeof(int),
6925                 .mode           = 0644,
6926                 .proc_handler   = proc_dointvec,
6927         },
6928         {
6929                 .procname       = "ignore_routes_with_linkdown",
6930                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6931                 .maxlen         = sizeof(int),
6932                 .mode           = 0644,
6933                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6934         },
6935         {
6936                 .procname       = "drop_unicast_in_l2_multicast",
6937                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6938                 .maxlen         = sizeof(int),
6939                 .mode           = 0644,
6940                 .proc_handler   = proc_dointvec,
6941         },
6942         {
6943                 .procname       = "drop_unsolicited_na",
6944                 .data           = &ipv6_devconf.drop_unsolicited_na,
6945                 .maxlen         = sizeof(int),
6946                 .mode           = 0644,
6947                 .proc_handler   = proc_dointvec,
6948         },
6949         {
6950                 .procname       = "keep_addr_on_down",
6951                 .data           = &ipv6_devconf.keep_addr_on_down,
6952                 .maxlen         = sizeof(int),
6953                 .mode           = 0644,
6954                 .proc_handler   = proc_dointvec,
6955
6956         },
6957         {
6958                 .procname       = "seg6_enabled",
6959                 .data           = &ipv6_devconf.seg6_enabled,
6960                 .maxlen         = sizeof(int),
6961                 .mode           = 0644,
6962                 .proc_handler   = proc_dointvec,
6963         },
6964 #ifdef CONFIG_IPV6_SEG6_HMAC
6965         {
6966                 .procname       = "seg6_require_hmac",
6967                 .data           = &ipv6_devconf.seg6_require_hmac,
6968                 .maxlen         = sizeof(int),
6969                 .mode           = 0644,
6970                 .proc_handler   = proc_dointvec,
6971         },
6972 #endif
6973         {
6974                 .procname       = "enhanced_dad",
6975                 .data           = &ipv6_devconf.enhanced_dad,
6976                 .maxlen         = sizeof(int),
6977                 .mode           = 0644,
6978                 .proc_handler   = proc_dointvec,
6979         },
6980         {
6981                 .procname       = "addr_gen_mode",
6982                 .data           = &ipv6_devconf.addr_gen_mode,
6983                 .maxlen         = sizeof(int),
6984                 .mode           = 0644,
6985                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6986         },
6987         {
6988                 .procname       = "disable_policy",
6989                 .data           = &ipv6_devconf.disable_policy,
6990                 .maxlen         = sizeof(int),
6991                 .mode           = 0644,
6992                 .proc_handler   = addrconf_sysctl_disable_policy,
6993         },
6994         {
6995                 .procname       = "ndisc_tclass",
6996                 .data           = &ipv6_devconf.ndisc_tclass,
6997                 .maxlen         = sizeof(int),
6998                 .mode           = 0644,
6999                 .proc_handler   = proc_dointvec_minmax,
7000                 .extra1         = (void *)SYSCTL_ZERO,
7001                 .extra2         = (void *)&two_five_five,
7002         },
7003         {
7004                 .procname       = "rpl_seg_enabled",
7005                 .data           = &ipv6_devconf.rpl_seg_enabled,
7006                 .maxlen         = sizeof(int),
7007                 .mode           = 0644,
7008                 .proc_handler   = proc_dointvec,
7009         },
7010         {
7011                 .procname       = "ioam6_enabled",
7012                 .data           = &ipv6_devconf.ioam6_enabled,
7013                 .maxlen         = sizeof(u8),
7014                 .mode           = 0644,
7015                 .proc_handler   = proc_dou8vec_minmax,
7016                 .extra1         = (void *)SYSCTL_ZERO,
7017                 .extra2         = (void *)SYSCTL_ONE,
7018         },
7019         {
7020                 .procname       = "ioam6_id",
7021                 .data           = &ipv6_devconf.ioam6_id,
7022                 .maxlen         = sizeof(u32),
7023                 .mode           = 0644,
7024                 .proc_handler   = proc_douintvec_minmax,
7025                 .extra1         = (void *)SYSCTL_ZERO,
7026                 .extra2         = (void *)&ioam6_if_id_max,
7027         },
7028         {
7029                 .procname       = "ioam6_id_wide",
7030                 .data           = &ipv6_devconf.ioam6_id_wide,
7031                 .maxlen         = sizeof(u32),
7032                 .mode           = 0644,
7033                 .proc_handler   = proc_douintvec,
7034         },
7035         {
7036                 .procname       = "ndisc_evict_nocarrier",
7037                 .data           = &ipv6_devconf.ndisc_evict_nocarrier,
7038                 .maxlen         = sizeof(u8),
7039                 .mode           = 0644,
7040                 .proc_handler   = proc_dou8vec_minmax,
7041                 .extra1         = (void *)SYSCTL_ZERO,
7042                 .extra2         = (void *)SYSCTL_ONE,
7043         },
7044         {
7045                 .procname       = "accept_untracked_na",
7046                 .data           = &ipv6_devconf.accept_untracked_na,
7047                 .maxlen         = sizeof(int),
7048                 .mode           = 0644,
7049                 .proc_handler   = proc_dointvec_minmax,
7050                 .extra1         = SYSCTL_ZERO,
7051                 .extra2         = SYSCTL_TWO,
7052         },
7053         {
7054                 /* sentinel */
7055         }
7056 };
7057
7058 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7059                 struct inet6_dev *idev, struct ipv6_devconf *p)
7060 {
7061         int i, ifindex;
7062         struct ctl_table *table;
7063         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7064
7065         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7066         if (!table)
7067                 goto out;
7068
7069         for (i = 0; table[i].data; i++) {
7070                 table[i].data += (char *)p - (char *)&ipv6_devconf;
7071                 /* If one of these is already set, then it is not safe to
7072                  * overwrite either of them: this makes proc_dointvec_minmax
7073                  * usable.
7074                  */
7075                 if (!table[i].extra1 && !table[i].extra2) {
7076                         table[i].extra1 = idev; /* embedded; no ref */
7077                         table[i].extra2 = net;
7078                 }
7079         }
7080
7081         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7082
7083         p->sysctl_header = register_net_sysctl(net, path, table);
7084         if (!p->sysctl_header)
7085                 goto free;
7086
7087         if (!strcmp(dev_name, "all"))
7088                 ifindex = NETCONFA_IFINDEX_ALL;
7089         else if (!strcmp(dev_name, "default"))
7090                 ifindex = NETCONFA_IFINDEX_DEFAULT;
7091         else
7092                 ifindex = idev->dev->ifindex;
7093         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7094                                      ifindex, p);
7095         return 0;
7096
7097 free:
7098         kfree(table);
7099 out:
7100         return -ENOBUFS;
7101 }
7102
7103 static void __addrconf_sysctl_unregister(struct net *net,
7104                                          struct ipv6_devconf *p, int ifindex)
7105 {
7106         struct ctl_table *table;
7107
7108         if (!p->sysctl_header)
7109                 return;
7110
7111         table = p->sysctl_header->ctl_table_arg;
7112         unregister_net_sysctl_table(p->sysctl_header);
7113         p->sysctl_header = NULL;
7114         kfree(table);
7115
7116         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7117 }
7118
7119 static int addrconf_sysctl_register(struct inet6_dev *idev)
7120 {
7121         int err;
7122
7123         if (!sysctl_dev_name_is_allowed(idev->dev->name))
7124                 return -EINVAL;
7125
7126         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7127                                     &ndisc_ifinfo_sysctl_change);
7128         if (err)
7129                 return err;
7130         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7131                                          idev, &idev->cnf);
7132         if (err)
7133                 neigh_sysctl_unregister(idev->nd_parms);
7134
7135         return err;
7136 }
7137
7138 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7139 {
7140         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7141                                      idev->dev->ifindex);
7142         neigh_sysctl_unregister(idev->nd_parms);
7143 }
7144
7145
7146 #endif
7147
7148 static int __net_init addrconf_init_net(struct net *net)
7149 {
7150         int err = -ENOMEM;
7151         struct ipv6_devconf *all, *dflt;
7152
7153         spin_lock_init(&net->ipv6.addrconf_hash_lock);
7154         INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7155         net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7156                                            sizeof(struct hlist_head),
7157                                            GFP_KERNEL);
7158         if (!net->ipv6.inet6_addr_lst)
7159                 goto err_alloc_addr;
7160
7161         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7162         if (!all)
7163                 goto err_alloc_all;
7164
7165         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7166         if (!dflt)
7167                 goto err_alloc_dflt;
7168
7169         if (!net_eq(net, &init_net)) {
7170                 switch (net_inherit_devconf()) {
7171                 case 1:  /* copy from init_net */
7172                         memcpy(all, init_net.ipv6.devconf_all,
7173                                sizeof(ipv6_devconf));
7174                         memcpy(dflt, init_net.ipv6.devconf_dflt,
7175                                sizeof(ipv6_devconf_dflt));
7176                         break;
7177                 case 3: /* copy from the current netns */
7178                         memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7179                                sizeof(ipv6_devconf));
7180                         memcpy(dflt,
7181                                current->nsproxy->net_ns->ipv6.devconf_dflt,
7182                                sizeof(ipv6_devconf_dflt));
7183                         break;
7184                 case 0:
7185                 case 2:
7186                         /* use compiled values */
7187                         break;
7188                 }
7189         }
7190
7191         /* these will be inherited by all namespaces */
7192         dflt->autoconf = ipv6_defaults.autoconf;
7193         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7194
7195         dflt->stable_secret.initialized = false;
7196         all->stable_secret.initialized = false;
7197
7198         net->ipv6.devconf_all = all;
7199         net->ipv6.devconf_dflt = dflt;
7200
7201 #ifdef CONFIG_SYSCTL
7202         err = __addrconf_sysctl_register(net, "all", NULL, all);
7203         if (err < 0)
7204                 goto err_reg_all;
7205
7206         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7207         if (err < 0)
7208                 goto err_reg_dflt;
7209 #endif
7210         return 0;
7211
7212 #ifdef CONFIG_SYSCTL
7213 err_reg_dflt:
7214         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7215 err_reg_all:
7216         kfree(dflt);
7217         net->ipv6.devconf_dflt = NULL;
7218 #endif
7219 err_alloc_dflt:
7220         kfree(all);
7221         net->ipv6.devconf_all = NULL;
7222 err_alloc_all:
7223         kfree(net->ipv6.inet6_addr_lst);
7224 err_alloc_addr:
7225         return err;
7226 }
7227
7228 static void __net_exit addrconf_exit_net(struct net *net)
7229 {
7230         int i;
7231
7232 #ifdef CONFIG_SYSCTL
7233         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7234                                      NETCONFA_IFINDEX_DEFAULT);
7235         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7236                                      NETCONFA_IFINDEX_ALL);
7237 #endif
7238         kfree(net->ipv6.devconf_dflt);
7239         net->ipv6.devconf_dflt = NULL;
7240         kfree(net->ipv6.devconf_all);
7241         net->ipv6.devconf_all = NULL;
7242
7243         cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7244         /*
7245          *      Check hash table, then free it.
7246          */
7247         for (i = 0; i < IN6_ADDR_HSIZE; i++)
7248                 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7249
7250         kfree(net->ipv6.inet6_addr_lst);
7251         net->ipv6.inet6_addr_lst = NULL;
7252 }
7253
7254 static struct pernet_operations addrconf_ops = {
7255         .init = addrconf_init_net,
7256         .exit = addrconf_exit_net,
7257 };
7258
7259 static struct rtnl_af_ops inet6_ops __read_mostly = {
7260         .family           = AF_INET6,
7261         .fill_link_af     = inet6_fill_link_af,
7262         .get_link_af_size = inet6_get_link_af_size,
7263         .validate_link_af = inet6_validate_link_af,
7264         .set_link_af      = inet6_set_link_af,
7265 };
7266
7267 /*
7268  *      Init / cleanup code
7269  */
7270
7271 int __init addrconf_init(void)
7272 {
7273         struct inet6_dev *idev;
7274         int err;
7275
7276         err = ipv6_addr_label_init();
7277         if (err < 0) {
7278                 pr_crit("%s: cannot initialize default policy table: %d\n",
7279                         __func__, err);
7280                 goto out;
7281         }
7282
7283         err = register_pernet_subsys(&addrconf_ops);
7284         if (err < 0)
7285                 goto out_addrlabel;
7286
7287         addrconf_wq = create_workqueue("ipv6_addrconf");
7288         if (!addrconf_wq) {
7289                 err = -ENOMEM;
7290                 goto out_nowq;
7291         }
7292
7293         rtnl_lock();
7294         idev = ipv6_add_dev(blackhole_netdev);
7295         rtnl_unlock();
7296         if (IS_ERR(idev)) {
7297                 err = PTR_ERR(idev);
7298                 goto errlo;
7299         }
7300
7301         ip6_route_init_special_entries();
7302
7303         register_netdevice_notifier(&ipv6_dev_notf);
7304
7305         addrconf_verify(&init_net);
7306
7307         rtnl_af_register(&inet6_ops);
7308
7309         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7310                                    NULL, inet6_dump_ifinfo, 0);
7311         if (err < 0)
7312                 goto errout;
7313
7314         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7315                                    inet6_rtm_newaddr, NULL, 0);
7316         if (err < 0)
7317                 goto errout;
7318         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7319                                    inet6_rtm_deladdr, NULL, 0);
7320         if (err < 0)
7321                 goto errout;
7322         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7323                                    inet6_rtm_getaddr, inet6_dump_ifaddr,
7324                                    RTNL_FLAG_DOIT_UNLOCKED);
7325         if (err < 0)
7326                 goto errout;
7327         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7328                                    NULL, inet6_dump_ifmcaddr, 0);
7329         if (err < 0)
7330                 goto errout;
7331         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7332                                    NULL, inet6_dump_ifacaddr, 0);
7333         if (err < 0)
7334                 goto errout;
7335         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7336                                    inet6_netconf_get_devconf,
7337                                    inet6_netconf_dump_devconf,
7338                                    RTNL_FLAG_DOIT_UNLOCKED);
7339         if (err < 0)
7340                 goto errout;
7341         err = ipv6_addr_label_rtnl_register();
7342         if (err < 0)
7343                 goto errout;
7344
7345         return 0;
7346 errout:
7347         rtnl_unregister_all(PF_INET6);
7348         rtnl_af_unregister(&inet6_ops);
7349         unregister_netdevice_notifier(&ipv6_dev_notf);
7350 errlo:
7351         destroy_workqueue(addrconf_wq);
7352 out_nowq:
7353         unregister_pernet_subsys(&addrconf_ops);
7354 out_addrlabel:
7355         ipv6_addr_label_cleanup();
7356 out:
7357         return err;
7358 }
7359
7360 void addrconf_cleanup(void)
7361 {
7362         struct net_device *dev;
7363
7364         unregister_netdevice_notifier(&ipv6_dev_notf);
7365         unregister_pernet_subsys(&addrconf_ops);
7366         ipv6_addr_label_cleanup();
7367
7368         rtnl_af_unregister(&inet6_ops);
7369
7370         rtnl_lock();
7371
7372         /* clean dev list */
7373         for_each_netdev(&init_net, dev) {
7374                 if (__in6_dev_get(dev) == NULL)
7375                         continue;
7376                 addrconf_ifdown(dev, true);
7377         }
7378         addrconf_ifdown(init_net.loopback_dev, true);
7379
7380         rtnl_unlock();
7381
7382         destroy_workqueue(addrconf_wq);
7383 }