net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #define pr_fmt(fmt) "IPv6: " fmt
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/kernel.h>
  46 #include <linux/sched/signal.h>
  47 #include <linux/socket.h>
  48 #include <linux/sockios.h>
  49 #include <linux/net.h>
  50 #include <linux/inet.h>
  51 #include <linux/in6.h>
  52 #include <linux/netdevice.h>
  53 #include <linux/if_addr.h>
  54 #include <linux/if_arp.h>
  55 #include <linux/if_arcnet.h>
  56 #include <linux/if_infiniband.h>
  57 #include <linux/route.h>
  58 #include <linux/inetdevice.h>
  59 #include <linux/init.h>
  60 #include <linux/slab.h>
  61 #ifdef CONFIG_SYSCTL
  62 #include <linux/sysctl.h>
  63 #endif
  64 #include <linux/capability.h>
  65 #include <linux/delay.h>
  66 #include <linux/notifier.h>
  67 #include <linux/string.h>
  68 #include <linux/hash.h>
  69
  70 #include <net/net_namespace.h>
  71 #include <net/sock.h>
  72 #include <net/snmp.h>
  73
  74 #include <net/6lowpan.h>
  75 #include <net/firewire.h>
  76 #include <net/ipv6.h>
  77 #include <net/protocol.h>
  78 #include <net/ndisc.h>
  79 #include <net/ip6_route.h>
  80 #include <net/addrconf.h>
  81 #include <net/tcp.h>
  82 #include <net/ip.h>
  83 #include <net/netlink.h>
  84 #include <net/pkt_sched.h>
  85 #include <net/l3mdev.h>
  86 #include <linux/if_tunnel.h>
  87 #include <linux/rtnetlink.h>
  88 #include <linux/netconf.h>
  89 #include <linux/random.h>
  90 #include <linux/uaccess.h>
  91 #include <asm/unaligned.h>
  92
  93 #include <linux/proc_fs.h>
  94 #include <linux/seq_file.h>
  95 #include <linux/export.h>
  96
  97 /* Set to 3 to get tracing... */
  98 #define ACONF_DEBUG 2
  99
 100 #if ACONF_DEBUG >= 3
 101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
 102 #else
 103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 104 #endif
 105
 106 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 107
 108 #define IPV6_MAX_STRLEN \
 109         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
 110
 111 static inline u32 cstamp_delta(unsigned long cstamp)
 112 {
 113         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 114 }
 115
 116 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 117 {
 118         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 119         u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
 120         do_div(tmp, 1000000);
 121         return (s32)tmp;
 122 }
 123
 124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 125 {
 126         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 127         u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
 128         do_div(tmp, 1000000);
 129         if ((s32)tmp > mrt) {
 130                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 131                 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
 132                 do_div(tmp, 1000000);
 133         }
 134         return (s32)tmp;
 135 }
 136
 137 #ifdef CONFIG_SYSCTL
 138 static int addrconf_sysctl_register(struct inet6_dev *idev);
 139 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 140 #else
 141 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 142 {
 143         return 0;
 144 }
 145
 146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 147 {
 148 }
 149 #endif
 150
 151 static void ipv6_regen_rndid(struct inet6_dev *idev);
 152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 153
 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 155 static int ipv6_count_addresses(const struct inet6_dev *idev);
 156 static int ipv6_generate_stable_address(struct in6_addr *addr,
 157                                         u8 dad_count,
 158                                         const struct inet6_dev *idev);
 159
 160 #define IN6_ADDR_HSIZE_SHIFT    8
 161 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
 162 /*
 163  *      Configured unicast address hash table
 164  */
 165 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 166 static DEFINE_SPINLOCK(addrconf_hash_lock);
 167
 168 static void addrconf_verify(void);
 169 static void addrconf_verify_rtnl(void);
 170 static void addrconf_verify_work(struct work_struct *);
 171
 172 static struct workqueue_struct *addrconf_wq;
 173 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 174
 175 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 176 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 177
 178 static void addrconf_type_change(struct net_device *dev,
 179                                  unsigned long event);
 180 static int addrconf_ifdown(struct net_device *dev, int how);
 181
 182 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 183                                                   int plen,
 184                                                   const struct net_device *dev,
 185                                                   u32 flags, u32 noflags);
 186
 187 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 188 static void addrconf_dad_work(struct work_struct *w);
 189 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
 190                                    bool send_na);
 191 static void addrconf_dad_run(struct inet6_dev *idev);
 192 static void addrconf_rs_timer(struct timer_list *t);
 193 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 194 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 195
 196 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 197                                 struct prefix_info *pinfo);
 198
 199 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 200         .forwarding             = 0,
 201         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 202         .mtu6                   = IPV6_MIN_MTU,
 203         .accept_ra              = 1,
 204         .accept_redirects       = 1,
 205         .autoconf               = 1,
 206         .force_mld_version      = 0,
 207         .mldv1_unsolicited_report_interval = 10 * HZ,
 208         .mldv2_unsolicited_report_interval = HZ,
 209         .dad_transmits          = 1,
 210         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 211         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 212         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 213         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 214         .use_tempaddr           = 0,
 215         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 216         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 217         .regen_max_retry        = REGEN_MAX_RETRY,
 218         .max_desync_factor      = MAX_DESYNC_FACTOR,
 219         .max_addresses          = IPV6_MAX_ADDRESSES,
 220         .accept_ra_defrtr       = 1,
 221         .accept_ra_from_local   = 0,
 222         .accept_ra_min_hop_limit= 1,
 223         .accept_ra_pinfo        = 1,
 224 #ifdef CONFIG_IPV6_ROUTER_PREF
 225         .accept_ra_rtr_pref     = 1,
 226         .rtr_probe_interval     = 60 * HZ,
 227 #ifdef CONFIG_IPV6_ROUTE_INFO
 228         .accept_ra_rt_info_min_plen = 0,
 229         .accept_ra_rt_info_max_plen = 0,
 230 #endif
 231 #endif
 232         .proxy_ndp              = 0,
 233         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 234         .disable_ipv6           = 0,
 235         .accept_dad             = 0,
 236         .suppress_frag_ndisc    = 1,
 237         .accept_ra_mtu          = 1,
 238         .stable_secret          = {
 239                 .initialized = false,
 240         },
 241         .use_oif_addrs_only     = 0,
 242         .ignore_routes_with_linkdown = 0,
 243         .keep_addr_on_down      = 0,
 244         .seg6_enabled           = 0,
 245 #ifdef CONFIG_IPV6_SEG6_HMAC
 246         .seg6_require_hmac      = 0,
 247 #endif
 248         .enhanced_dad           = 1,
 249         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 250         .disable_policy         = 0,
 251 };
 252
 253 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 254         .forwarding             = 0,
 255         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 256         .mtu6                   = IPV6_MIN_MTU,
 257         .accept_ra              = 1,
 258         .accept_redirects       = 1,
 259         .autoconf               = 1,
 260         .force_mld_version      = 0,
 261         .mldv1_unsolicited_report_interval = 10 * HZ,
 262         .mldv2_unsolicited_report_interval = HZ,
 263         .dad_transmits          = 1,
 264         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 265         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 266         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 267         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 268         .use_tempaddr           = 0,
 269         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 270         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 271         .regen_max_retry        = REGEN_MAX_RETRY,
 272         .max_desync_factor      = MAX_DESYNC_FACTOR,
 273         .max_addresses          = IPV6_MAX_ADDRESSES,
 274         .accept_ra_defrtr       = 1,
 275         .accept_ra_from_local   = 0,
 276         .accept_ra_min_hop_limit= 1,
 277         .accept_ra_pinfo        = 1,
 278 #ifdef CONFIG_IPV6_ROUTER_PREF
 279         .accept_ra_rtr_pref     = 1,
 280         .rtr_probe_interval     = 60 * HZ,
 281 #ifdef CONFIG_IPV6_ROUTE_INFO
 282         .accept_ra_rt_info_min_plen = 0,
 283         .accept_ra_rt_info_max_plen = 0,
 284 #endif
 285 #endif
 286         .proxy_ndp              = 0,
 287         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 288         .disable_ipv6           = 0,
 289         .accept_dad             = 1,
 290         .suppress_frag_ndisc    = 1,
 291         .accept_ra_mtu          = 1,
 292         .stable_secret          = {
 293                 .initialized = false,
 294         },
 295         .use_oif_addrs_only     = 0,
 296         .ignore_routes_with_linkdown = 0,
 297         .keep_addr_on_down      = 0,
 298         .seg6_enabled           = 0,
 299 #ifdef CONFIG_IPV6_SEG6_HMAC
 300         .seg6_require_hmac      = 0,
 301 #endif
 302         .enhanced_dad           = 1,
 303         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 304         .disable_policy         = 0,
 305 };
 306
 307 /* Check if link is ready: is it up and is a valid qdisc available */
 308 static inline bool addrconf_link_ready(const struct net_device *dev)
 309 {
 310         return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
 311 }
 312
 313 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 314 {
 315         if (del_timer(&idev->rs_timer))
 316                 __in6_dev_put(idev);
 317 }
 318
 319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 320 {
 321         if (cancel_delayed_work(&ifp->dad_work))
 322                 __in6_ifa_put(ifp);
 323 }
 324
 325 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 326                                   unsigned long when)
 327 {
 328         if (!timer_pending(&idev->rs_timer))
 329                 in6_dev_hold(idev);
 330         mod_timer(&idev->rs_timer, jiffies + when);
 331 }
 332
 333 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 334                                    unsigned long delay)
 335 {
 336         in6_ifa_hold(ifp);
 337         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 338                 in6_ifa_put(ifp);
 339 }
 340
 341 static int snmp6_alloc_dev(struct inet6_dev *idev)
 342 {
 343         int i;
 344
 345         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 346         if (!idev->stats.ipv6)
 347                 goto err_ip;
 348
 349         for_each_possible_cpu(i) {
 350                 struct ipstats_mib *addrconf_stats;
 351                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 352                 u64_stats_init(&addrconf_stats->syncp);
 353         }
 354
 355
 356         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 357                                         GFP_KERNEL);
 358         if (!idev->stats.icmpv6dev)
 359                 goto err_icmp;
 360         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 361                                            GFP_KERNEL);
 362         if (!idev->stats.icmpv6msgdev)
 363                 goto err_icmpmsg;
 364
 365         return 0;
 366
 367 err_icmpmsg:
 368         kfree(idev->stats.icmpv6dev);
 369 err_icmp:
 370         free_percpu(idev->stats.ipv6);
 371 err_ip:
 372         return -ENOMEM;
 373 }
 374
 375 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 376 {
 377         struct inet6_dev *ndev;
 378         int err = -ENOMEM;
 379
 380         ASSERT_RTNL();
 381
 382         if (dev->mtu < IPV6_MIN_MTU)
 383                 return ERR_PTR(-EINVAL);
 384
 385         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 386         if (!ndev)
 387                 return ERR_PTR(err);
 388
 389         rwlock_init(&ndev->lock);
 390         ndev->dev = dev;
 391         INIT_LIST_HEAD(&ndev->addr_list);
 392         timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
 393         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 394
 395         if (ndev->cnf.stable_secret.initialized)
 396                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 397         else
 398                 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
 399
 400         ndev->cnf.mtu6 = dev->mtu;
 401         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 402         if (!ndev->nd_parms) {
 403                 kfree(ndev);
 404                 return ERR_PTR(err);
 405         }
 406         if (ndev->cnf.forwarding)
 407                 dev_disable_lro(dev);
 408         /* We refer to the device */
 409         dev_hold(dev);
 410
 411         if (snmp6_alloc_dev(ndev) < 0) {
 412                 ADBG(KERN_WARNING
 413                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 414                         __func__, dev->name);
 415                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 416                 dev_put(dev);
 417                 kfree(ndev);
 418                 return ERR_PTR(err);
 419         }
 420
 421         if (snmp6_register_dev(ndev) < 0) {
 422                 ADBG(KERN_WARNING
 423                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 424                         __func__, dev->name);
 425                 goto err_release;
 426         }
 427
 428         /* One reference from device. */
 429         refcount_set(&ndev->refcnt, 1);
 430
 431         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 432                 ndev->cnf.accept_dad = -1;
 433
 434 #if IS_ENABLED(CONFIG_IPV6_SIT)
 435         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 436                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 437                 ndev->cnf.rtr_solicits = 0;
 438         }
 439 #endif
 440
 441         INIT_LIST_HEAD(&ndev->tempaddr_list);
 442         ndev->desync_factor = U32_MAX;
 443         if ((dev->flags&IFF_LOOPBACK) ||
 444             dev->type == ARPHRD_TUNNEL ||
 445             dev->type == ARPHRD_TUNNEL6 ||
 446             dev->type == ARPHRD_SIT ||
 447             dev->type == ARPHRD_NONE) {
 448                 ndev->cnf.use_tempaddr = -1;
 449         } else
 450                 ipv6_regen_rndid(ndev);
 451
 452         ndev->token = in6addr_any;
 453
 454         if (netif_running(dev) && addrconf_link_ready(dev))
 455                 ndev->if_flags |= IF_READY;
 456
 457         ipv6_mc_init_dev(ndev);
 458         ndev->tstamp = jiffies;
 459         err = addrconf_sysctl_register(ndev);
 460         if (err) {
 461                 ipv6_mc_destroy_dev(ndev);
 462                 snmp6_unregister_dev(ndev);
 463                 goto err_release;
 464         }
 465         /* protected by rtnl_lock */
 466         rcu_assign_pointer(dev->ip6_ptr, ndev);
 467
 468         /* Join interface-local all-node multicast group */
 469         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 470
 471         /* Join all-node multicast group */
 472         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 473
 474         /* Join all-router multicast group if forwarding is set */
 475         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 476                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 477
 478         return ndev;
 479
 480 err_release:
 481         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 482         ndev->dead = 1;
 483         in6_dev_finish_destroy(ndev);
 484         return ERR_PTR(err);
 485 }
 486
 487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 488 {
 489         struct inet6_dev *idev;
 490
 491         ASSERT_RTNL();
 492
 493         idev = __in6_dev_get(dev);
 494         if (!idev) {
 495                 idev = ipv6_add_dev(dev);
 496                 if (IS_ERR(idev))
 497                         return NULL;
 498         }
 499
 500         if (dev->flags&IFF_UP)
 501                 ipv6_mc_up(idev);
 502         return idev;
 503 }
 504
 505 static int inet6_netconf_msgsize_devconf(int type)
 506 {
 507         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 508                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 509         bool all = false;
 510
 511         if (type == NETCONFA_ALL)
 512                 all = true;
 513
 514         if (all || type == NETCONFA_FORWARDING)
 515                 size += nla_total_size(4);
 516 #ifdef CONFIG_IPV6_MROUTE
 517         if (all || type == NETCONFA_MC_FORWARDING)
 518                 size += nla_total_size(4);
 519 #endif
 520         if (all || type == NETCONFA_PROXY_NEIGH)
 521                 size += nla_total_size(4);
 522
 523         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 524                 size += nla_total_size(4);
 525
 526         return size;
 527 }
 528
 529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 530                                       struct ipv6_devconf *devconf, u32 portid,
 531                                       u32 seq, int event, unsigned int flags,
 532                                       int type)
 533 {
 534         struct nlmsghdr  *nlh;
 535         struct netconfmsg *ncm;
 536         bool all = false;
 537
 538         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 539                         flags);
 540         if (!nlh)
 541                 return -EMSGSIZE;
 542
 543         if (type == NETCONFA_ALL)
 544                 all = true;
 545
 546         ncm = nlmsg_data(nlh);
 547         ncm->ncm_family = AF_INET6;
 548
 549         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 550                 goto nla_put_failure;
 551
 552         if (!devconf)
 553                 goto out;
 554
 555         if ((all || type == NETCONFA_FORWARDING) &&
 556             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 557                 goto nla_put_failure;
 558 #ifdef CONFIG_IPV6_MROUTE
 559         if ((all || type == NETCONFA_MC_FORWARDING) &&
 560             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 561                         devconf->mc_forwarding) < 0)
 562                 goto nla_put_failure;
 563 #endif
 564         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 565             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 566                 goto nla_put_failure;
 567
 568         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 569             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 570                         devconf->ignore_routes_with_linkdown) < 0)
 571                 goto nla_put_failure;
 572
 573 out:
 574         nlmsg_end(skb, nlh);
 575         return 0;
 576
 577 nla_put_failure:
 578         nlmsg_cancel(skb, nlh);
 579         return -EMSGSIZE;
 580 }
 581
 582 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 583                                   int ifindex, struct ipv6_devconf *devconf)
 584 {
 585         struct sk_buff *skb;
 586         int err = -ENOBUFS;
 587
 588         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 589         if (!skb)
 590                 goto errout;
 591
 592         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 593                                          event, 0, type);
 594         if (err < 0) {
 595                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 596                 WARN_ON(err == -EMSGSIZE);
 597                 kfree_skb(skb);
 598                 goto errout;
 599         }
 600         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 601         return;
 602 errout:
 603         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 604 }
 605
 606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 607         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 608         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 609         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 610         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 611 };
 612
 613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 614                                      struct nlmsghdr *nlh,
 615                                      struct netlink_ext_ack *extack)
 616 {
 617         struct net *net = sock_net(in_skb->sk);
 618         struct nlattr *tb[NETCONFA_MAX+1];
 619         struct inet6_dev *in6_dev = NULL;
 620         struct net_device *dev = NULL;
 621         struct netconfmsg *ncm;
 622         struct sk_buff *skb;
 623         struct ipv6_devconf *devconf;
 624         int ifindex;
 625         int err;
 626
 627         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 628                           devconf_ipv6_policy, extack);
 629         if (err < 0)
 630                 return err;
 631
 632         if (!tb[NETCONFA_IFINDEX])
 633                 return -EINVAL;
 634
 635         err = -EINVAL;
 636         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 637         switch (ifindex) {
 638         case NETCONFA_IFINDEX_ALL:
 639                 devconf = net->ipv6.devconf_all;
 640                 break;
 641         case NETCONFA_IFINDEX_DEFAULT:
 642                 devconf = net->ipv6.devconf_dflt;
 643                 break;
 644         default:
 645                 dev = dev_get_by_index(net, ifindex);
 646                 if (!dev)
 647                         return -EINVAL;
 648                 in6_dev = in6_dev_get(dev);
 649                 if (!in6_dev)
 650                         goto errout;
 651                 devconf = &in6_dev->cnf;
 652                 break;
 653         }
 654
 655         err = -ENOBUFS;
 656         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
 657         if (!skb)
 658                 goto errout;
 659
 660         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 661                                          NETLINK_CB(in_skb).portid,
 662                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 663                                          NETCONFA_ALL);
 664         if (err < 0) {
 665                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 666                 WARN_ON(err == -EMSGSIZE);
 667                 kfree_skb(skb);
 668                 goto errout;
 669         }
 670         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 671 errout:
 672         if (in6_dev)
 673                 in6_dev_put(in6_dev);
 674         if (dev)
 675                 dev_put(dev);
 676         return err;
 677 }
 678
 679 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 680                                       struct netlink_callback *cb)
 681 {
 682         struct net *net = sock_net(skb->sk);
 683         int h, s_h;
 684         int idx, s_idx;
 685         struct net_device *dev;
 686         struct inet6_dev *idev;
 687         struct hlist_head *head;
 688
 689         s_h = cb->args[0];
 690         s_idx = idx = cb->args[1];
 691
 692         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 693                 idx = 0;
 694                 head = &net->dev_index_head[h];
 695                 rcu_read_lock();
 696                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 697                           net->dev_base_seq;
 698                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 699                         if (idx < s_idx)
 700                                 goto cont;
 701                         idev = __in6_dev_get(dev);
 702                         if (!idev)
 703                                 goto cont;
 704
 705                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 706                                                        &idev->cnf,
 707                                                        NETLINK_CB(cb->skb).portid,
 708                                                        cb->nlh->nlmsg_seq,
 709                                                        RTM_NEWNETCONF,
 710                                                        NLM_F_MULTI,
 711                                                        NETCONFA_ALL) < 0) {
 712                                 rcu_read_unlock();
 713                                 goto done;
 714                         }
 715                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 716 cont:
 717                         idx++;
 718                 }
 719                 rcu_read_unlock();
 720         }
 721         if (h == NETDEV_HASHENTRIES) {
 722                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 723                                                net->ipv6.devconf_all,
 724                                                NETLINK_CB(cb->skb).portid,
 725                                                cb->nlh->nlmsg_seq,
 726                                                RTM_NEWNETCONF, NLM_F_MULTI,
 727                                                NETCONFA_ALL) < 0)
 728                         goto done;
 729                 else
 730                         h++;
 731         }
 732         if (h == NETDEV_HASHENTRIES + 1) {
 733                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 734                                                net->ipv6.devconf_dflt,
 735                                                NETLINK_CB(cb->skb).portid,
 736                                                cb->nlh->nlmsg_seq,
 737                                                RTM_NEWNETCONF, NLM_F_MULTI,
 738                                                NETCONFA_ALL) < 0)
 739                         goto done;
 740                 else
 741                         h++;
 742         }
 743 done:
 744         cb->args[0] = h;
 745         cb->args[1] = idx;
 746
 747         return skb->len;
 748 }
 749
 750 #ifdef CONFIG_SYSCTL
 751 static void dev_forward_change(struct inet6_dev *idev)
 752 {
 753         struct net_device *dev;
 754         struct inet6_ifaddr *ifa;
 755
 756         if (!idev)
 757                 return;
 758         dev = idev->dev;
 759         if (idev->cnf.forwarding)
 760                 dev_disable_lro(dev);
 761         if (dev->flags & IFF_MULTICAST) {
 762                 if (idev->cnf.forwarding) {
 763                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 764                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 765                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 766                 } else {
 767                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 768                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 769                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 770                 }
 771         }
 772
 773         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 774                 if (ifa->flags&IFA_F_TENTATIVE)
 775                         continue;
 776                 if (idev->cnf.forwarding)
 777                         addrconf_join_anycast(ifa);
 778                 else
 779                         addrconf_leave_anycast(ifa);
 780         }
 781         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 782                                      NETCONFA_FORWARDING,
 783                                      dev->ifindex, &idev->cnf);
 784 }
 785
 786
 787 static void addrconf_forward_change(struct net *net, __s32 newf)
 788 {
 789         struct net_device *dev;
 790         struct inet6_dev *idev;
 791
 792         for_each_netdev(net, dev) {
 793                 idev = __in6_dev_get(dev);
 794                 if (idev) {
 795                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 796                         idev->cnf.forwarding = newf;
 797                         if (changed)
 798                                 dev_forward_change(idev);
 799                 }
 800         }
 801 }
 802
 803 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 804 {
 805         struct net *net;
 806         int old;
 807
 808         if (!rtnl_trylock())
 809                 return restart_syscall();
 810
 811         net = (struct net *)table->extra2;
 812         old = *p;
 813         *p = newf;
 814
 815         if (p == &net->ipv6.devconf_dflt->forwarding) {
 816                 if ((!newf) ^ (!old))
 817                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 818                                                      NETCONFA_FORWARDING,
 819                                                      NETCONFA_IFINDEX_DEFAULT,
 820                                                      net->ipv6.devconf_dflt);
 821                 rtnl_unlock();
 822                 return 0;
 823         }
 824
 825         if (p == &net->ipv6.devconf_all->forwarding) {
 826                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 827
 828                 net->ipv6.devconf_dflt->forwarding = newf;
 829                 if ((!newf) ^ (!old_dflt))
 830                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 831                                                      NETCONFA_FORWARDING,
 832                                                      NETCONFA_IFINDEX_DEFAULT,
 833                                                      net->ipv6.devconf_dflt);
 834
 835                 addrconf_forward_change(net, newf);
 836                 if ((!newf) ^ (!old))
 837                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 838                                                      NETCONFA_FORWARDING,
 839                                                      NETCONFA_IFINDEX_ALL,
 840                                                      net->ipv6.devconf_all);
 841         } else if ((!newf) ^ (!old))
 842                 dev_forward_change((struct inet6_dev *)table->extra1);
 843         rtnl_unlock();
 844
 845         if (newf)
 846                 rt6_purge_dflt_routers(net);
 847         return 1;
 848 }
 849
 850 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 851 {
 852         struct net_device *dev;
 853         struct inet6_dev *idev;
 854
 855         for_each_netdev(net, dev) {
 856                 idev = __in6_dev_get(dev);
 857                 if (idev) {
 858                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 859
 860                         idev->cnf.ignore_routes_with_linkdown = newf;
 861                         if (changed)
 862                                 inet6_netconf_notify_devconf(dev_net(dev),
 863                                                              RTM_NEWNETCONF,
 864                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 865                                                              dev->ifindex,
 866                                                              &idev->cnf);
 867                 }
 868         }
 869 }
 870
 871 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 872 {
 873         struct net *net;
 874         int old;
 875
 876         if (!rtnl_trylock())
 877                 return restart_syscall();
 878
 879         net = (struct net *)table->extra2;
 880         old = *p;
 881         *p = newf;
 882
 883         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 884                 if ((!newf) ^ (!old))
 885                         inet6_netconf_notify_devconf(net,
 886                                                      RTM_NEWNETCONF,
 887                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 888                                                      NETCONFA_IFINDEX_DEFAULT,
 889                                                      net->ipv6.devconf_dflt);
 890                 rtnl_unlock();
 891                 return 0;
 892         }
 893
 894         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 895                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 896                 addrconf_linkdown_change(net, newf);
 897                 if ((!newf) ^ (!old))
 898                         inet6_netconf_notify_devconf(net,
 899                                                      RTM_NEWNETCONF,
 900                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 901                                                      NETCONFA_IFINDEX_ALL,
 902                                                      net->ipv6.devconf_all);
 903         }
 904         rtnl_unlock();
 905
 906         return 1;
 907 }
 908
 909 #endif
 910
 911 /* Nobody refers to this ifaddr, destroy it */
 912 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 913 {
 914         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 915
 916 #ifdef NET_REFCNT_DEBUG
 917         pr_debug("%s\n", __func__);
 918 #endif
 919
 920         in6_dev_put(ifp->idev);
 921
 922         if (cancel_delayed_work(&ifp->dad_work))
 923                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 924                           ifp);
 925
 926         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 927                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 928                 return;
 929         }
 930         ip6_rt_put(ifp->rt);
 931
 932         kfree_rcu(ifp, rcu);
 933 }
 934
 935 static void
 936 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 937 {
 938         struct list_head *p;
 939         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 940
 941         /*
 942          * Each device address list is sorted in order of scope -
 943          * global before linklocal.
 944          */
 945         list_for_each(p, &idev->addr_list) {
 946                 struct inet6_ifaddr *ifa
 947                         = list_entry(p, struct inet6_ifaddr, if_list);
 948                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 949                         break;
 950         }
 951
 952         list_add_tail_rcu(&ifp->if_list, p);
 953 }
 954
 955 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
 956 {
 957         u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
 958
 959         return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
 960 }
 961
 962 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 963                                struct net_device *dev, unsigned int hash)
 964 {
 965         struct inet6_ifaddr *ifp;
 966
 967         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
 968                 if (!net_eq(dev_net(ifp->idev->dev), net))
 969                         continue;
 970                 if (ipv6_addr_equal(&ifp->addr, addr)) {
 971                         if (!dev || ifp->idev->dev == dev)
 972                                 return true;
 973                 }
 974         }
 975         return false;
 976 }
 977
 978 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
 979 {
 980         unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
 981         int err = 0;
 982
 983         spin_lock(&addrconf_hash_lock);
 984
 985         /* Ignore adding duplicate addresses on an interface */
 986         if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
 987                 ADBG("ipv6_add_addr: already assigned\n");
 988                 err = -EEXIST;
 989         } else {
 990                 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 991         }
 992
 993         spin_unlock(&addrconf_hash_lock);
 994
 995         return err;
 996 }
 997
 998 /* On success it returns ifp with increased reference count */
 999
1000 static struct inet6_ifaddr *
1001 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
1002               const struct in6_addr *peer_addr, int pfxlen,
1003               int scope, u32 flags, u32 valid_lft, u32 prefered_lft,
1004               bool can_block, struct netlink_ext_ack *extack)
1005 {
1006         gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1007         struct net *net = dev_net(idev->dev);
1008         struct inet6_ifaddr *ifa = NULL;
1009         struct rt6_info *rt = NULL;
1010         int err = 0;
1011         int addr_type = ipv6_addr_type(addr);
1012
1013         if (addr_type == IPV6_ADDR_ANY ||
1014             addr_type & IPV6_ADDR_MULTICAST ||
1015             (!(idev->dev->flags & IFF_LOOPBACK) &&
1016              addr_type & IPV6_ADDR_LOOPBACK))
1017                 return ERR_PTR(-EADDRNOTAVAIL);
1018
1019         if (idev->dead) {
1020                 err = -ENODEV;                  /*XXX*/
1021                 goto out;
1022         }
1023
1024         if (idev->cnf.disable_ipv6) {
1025                 err = -EACCES;
1026                 goto out;
1027         }
1028
1029         /* validator notifier needs to be blocking;
1030          * do not call in atomic context
1031          */
1032         if (can_block) {
1033                 struct in6_validator_info i6vi = {
1034                         .i6vi_addr = *addr,
1035                         .i6vi_dev = idev,
1036                         .extack = extack,
1037                 };
1038
1039                 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1040                 err = notifier_to_errno(err);
1041                 if (err < 0)
1042                         goto out;
1043         }
1044
1045         ifa = kzalloc(sizeof(*ifa), gfp_flags);
1046         if (!ifa) {
1047                 ADBG("ipv6_add_addr: malloc failed\n");
1048                 err = -ENOBUFS;
1049                 goto out;
1050         }
1051
1052         rt = addrconf_dst_alloc(idev, addr, false);
1053         if (IS_ERR(rt)) {
1054                 err = PTR_ERR(rt);
1055                 rt = NULL;
1056                 goto out;
1057         }
1058
1059         if (net->ipv6.devconf_all->disable_policy ||
1060             idev->cnf.disable_policy)
1061                 rt->dst.flags |= DST_NOPOLICY;
1062
1063         neigh_parms_data_state_setall(idev->nd_parms);
1064
1065         ifa->addr = *addr;
1066         if (peer_addr)
1067                 ifa->peer_addr = *peer_addr;
1068
1069         spin_lock_init(&ifa->lock);
1070         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1071         INIT_HLIST_NODE(&ifa->addr_lst);
1072         ifa->scope = scope;
1073         ifa->prefix_len = pfxlen;
1074         ifa->flags = flags;
1075         /* No need to add the TENTATIVE flag for addresses with NODAD */
1076         if (!(flags & IFA_F_NODAD))
1077                 ifa->flags |= IFA_F_TENTATIVE;
1078         ifa->valid_lft = valid_lft;
1079         ifa->prefered_lft = prefered_lft;
1080         ifa->cstamp = ifa->tstamp = jiffies;
1081         ifa->tokenized = false;
1082
1083         ifa->rt = rt;
1084
1085         ifa->idev = idev;
1086         in6_dev_hold(idev);
1087
1088         /* For caller */
1089         refcount_set(&ifa->refcnt, 1);
1090
1091         rcu_read_lock_bh();
1092
1093         err = ipv6_add_addr_hash(idev->dev, ifa);
1094         if (err < 0) {
1095                 rcu_read_unlock_bh();
1096                 goto out;
1097         }
1098
1099         write_lock(&idev->lock);
1100
1101         /* Add to inet6_dev unicast addr list. */
1102         ipv6_link_dev_addr(idev, ifa);
1103
1104         if (ifa->flags&IFA_F_TEMPORARY) {
1105                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1106                 in6_ifa_hold(ifa);
1107         }
1108
1109         in6_ifa_hold(ifa);
1110         write_unlock(&idev->lock);
1111
1112         rcu_read_unlock_bh();
1113
1114         inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1115 out:
1116         if (unlikely(err < 0)) {
1117                 if (rt)
1118                         ip6_rt_put(rt);
1119                 if (ifa) {
1120                         if (ifa->idev)
1121                                 in6_dev_put(ifa->idev);
1122                         kfree(ifa);
1123                 }
1124                 ifa = ERR_PTR(err);
1125         }
1126
1127         return ifa;
1128 }
1129
1130 enum cleanup_prefix_rt_t {
1131         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1132         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1133         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1134 };
1135
1136 /*
1137  * Check, whether the prefix for ifp would still need a prefix route
1138  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1139  * constants.
1140  *
1141  * 1) we don't purge prefix if address was not permanent.
1142  *    prefix is managed by its own lifetime.
1143  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1144  * 3) if there are no addresses, delete prefix.
1145  * 4) if there are still other permanent address(es),
1146  *    corresponding prefix is still permanent.
1147  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1148  *    don't purge the prefix, assume user space is managing it.
1149  * 6) otherwise, update prefix lifetime to the
1150  *    longest valid lifetime among the corresponding
1151  *    addresses on the device.
1152  *    Note: subsequent RA will update lifetime.
1153  **/
1154 static enum cleanup_prefix_rt_t
1155 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1156 {
1157         struct inet6_ifaddr *ifa;
1158         struct inet6_dev *idev = ifp->idev;
1159         unsigned long lifetime;
1160         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1161
1162         *expires = jiffies;
1163
1164         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1165                 if (ifa == ifp)
1166                         continue;
1167                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1168                                        ifp->prefix_len))
1169                         continue;
1170                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1171                         return CLEANUP_PREFIX_RT_NOP;
1172
1173                 action = CLEANUP_PREFIX_RT_EXPIRE;
1174
1175                 spin_lock(&ifa->lock);
1176
1177                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1178                 /*
1179                  * Note: Because this address is
1180                  * not permanent, lifetime <
1181                  * LONG_MAX / HZ here.
1182                  */
1183                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1184                         *expires = ifa->tstamp + lifetime * HZ;
1185                 spin_unlock(&ifa->lock);
1186         }
1187
1188         return action;
1189 }
1190
1191 static void
1192 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1193 {
1194         struct rt6_info *rt;
1195
1196         rt = addrconf_get_prefix_route(&ifp->addr,
1197                                        ifp->prefix_len,
1198                                        ifp->idev->dev,
1199                                        0, RTF_GATEWAY | RTF_DEFAULT);
1200         if (rt) {
1201                 if (del_rt)
1202                         ip6_del_rt(rt);
1203                 else {
1204                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1205                                 rt6_set_expires(rt, expires);
1206                         ip6_rt_put(rt);
1207                 }
1208         }
1209 }
1210
1211
1212 /* This function wants to get referenced ifp and releases it before return */
1213
1214 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1215 {
1216         int state;
1217         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1218         unsigned long expires;
1219
1220         ASSERT_RTNL();
1221
1222         spin_lock_bh(&ifp->lock);
1223         state = ifp->state;
1224         ifp->state = INET6_IFADDR_STATE_DEAD;
1225         spin_unlock_bh(&ifp->lock);
1226
1227         if (state == INET6_IFADDR_STATE_DEAD)
1228                 goto out;
1229
1230         spin_lock_bh(&addrconf_hash_lock);
1231         hlist_del_init_rcu(&ifp->addr_lst);
1232         spin_unlock_bh(&addrconf_hash_lock);
1233
1234         write_lock_bh(&ifp->idev->lock);
1235
1236         if (ifp->flags&IFA_F_TEMPORARY) {
1237                 list_del(&ifp->tmp_list);
1238                 if (ifp->ifpub) {
1239                         in6_ifa_put(ifp->ifpub);
1240                         ifp->ifpub = NULL;
1241                 }
1242                 __in6_ifa_put(ifp);
1243         }
1244
1245         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1246                 action = check_cleanup_prefix_route(ifp, &expires);
1247
1248         list_del_rcu(&ifp->if_list);
1249         __in6_ifa_put(ifp);
1250
1251         write_unlock_bh(&ifp->idev->lock);
1252
1253         addrconf_del_dad_work(ifp);
1254
1255         ipv6_ifa_notify(RTM_DELADDR, ifp);
1256
1257         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1258
1259         if (action != CLEANUP_PREFIX_RT_NOP) {
1260                 cleanup_prefix_route(ifp, expires,
1261                         action == CLEANUP_PREFIX_RT_DEL);
1262         }
1263
1264         /* clean up prefsrc entries */
1265         rt6_remove_prefsrc(ifp);
1266 out:
1267         in6_ifa_put(ifp);
1268 }
1269
1270 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1271                                 struct inet6_ifaddr *ift,
1272                                 bool block)
1273 {
1274         struct inet6_dev *idev = ifp->idev;
1275         struct in6_addr addr, *tmpaddr;
1276         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1277         unsigned long regen_advance;
1278         int tmp_plen;
1279         int ret = 0;
1280         u32 addr_flags;
1281         unsigned long now = jiffies;
1282         long max_desync_factor;
1283         s32 cnf_temp_preferred_lft;
1284
1285         write_lock_bh(&idev->lock);
1286         if (ift) {
1287                 spin_lock_bh(&ift->lock);
1288                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1289                 spin_unlock_bh(&ift->lock);
1290                 tmpaddr = &addr;
1291         } else {
1292                 tmpaddr = NULL;
1293         }
1294 retry:
1295         in6_dev_hold(idev);
1296         if (idev->cnf.use_tempaddr <= 0) {
1297                 write_unlock_bh(&idev->lock);
1298                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1299                 in6_dev_put(idev);
1300                 ret = -1;
1301                 goto out;
1302         }
1303         spin_lock_bh(&ifp->lock);
1304         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1305                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1306                 spin_unlock_bh(&ifp->lock);
1307                 write_unlock_bh(&idev->lock);
1308                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1309                         __func__);
1310                 in6_dev_put(idev);
1311                 ret = -1;
1312                 goto out;
1313         }
1314         in6_ifa_hold(ifp);
1315         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1316         ipv6_try_regen_rndid(idev, tmpaddr);
1317         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1318         age = (now - ifp->tstamp) / HZ;
1319
1320         regen_advance = idev->cnf.regen_max_retry *
1321                         idev->cnf.dad_transmits *
1322                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1323
1324         /* recalculate max_desync_factor each time and update
1325          * idev->desync_factor if it's larger
1326          */
1327         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1328         max_desync_factor = min_t(__u32,
1329                                   idev->cnf.max_desync_factor,
1330                                   cnf_temp_preferred_lft - regen_advance);
1331
1332         if (unlikely(idev->desync_factor > max_desync_factor)) {
1333                 if (max_desync_factor > 0) {
1334                         get_random_bytes(&idev->desync_factor,
1335                                          sizeof(idev->desync_factor));
1336                         idev->desync_factor %= max_desync_factor;
1337                 } else {
1338                         idev->desync_factor = 0;
1339                 }
1340         }
1341
1342         tmp_valid_lft = min_t(__u32,
1343                               ifp->valid_lft,
1344                               idev->cnf.temp_valid_lft + age);
1345         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1346                             idev->desync_factor;
1347         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1348         tmp_plen = ifp->prefix_len;
1349         tmp_tstamp = ifp->tstamp;
1350         spin_unlock_bh(&ifp->lock);
1351
1352         write_unlock_bh(&idev->lock);
1353
1354         /* A temporary address is created only if this calculated Preferred
1355          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1356          * an implementation must not create a temporary address with a zero
1357          * Preferred Lifetime.
1358          * Use age calculation as in addrconf_verify to avoid unnecessary
1359          * temporary addresses being generated.
1360          */
1361         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1362         if (tmp_prefered_lft <= regen_advance + age) {
1363                 in6_ifa_put(ifp);
1364                 in6_dev_put(idev);
1365                 ret = -1;
1366                 goto out;
1367         }
1368
1369         addr_flags = IFA_F_TEMPORARY;
1370         /* set in addrconf_prefix_rcv() */
1371         if (ifp->flags & IFA_F_OPTIMISTIC)
1372                 addr_flags |= IFA_F_OPTIMISTIC;
1373
1374         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1375                             ipv6_addr_scope(&addr), addr_flags,
1376                             tmp_valid_lft, tmp_prefered_lft, block, NULL);
1377         if (IS_ERR(ift)) {
1378                 in6_ifa_put(ifp);
1379                 in6_dev_put(idev);
1380                 pr_info("%s: retry temporary address regeneration\n", __func__);
1381                 tmpaddr = &addr;
1382                 write_lock_bh(&idev->lock);
1383                 goto retry;
1384         }
1385
1386         spin_lock_bh(&ift->lock);
1387         ift->ifpub = ifp;
1388         ift->cstamp = now;
1389         ift->tstamp = tmp_tstamp;
1390         spin_unlock_bh(&ift->lock);
1391
1392         addrconf_dad_start(ift);
1393         in6_ifa_put(ift);
1394         in6_dev_put(idev);
1395 out:
1396         return ret;
1397 }
1398
1399 /*
1400  *      Choose an appropriate source address (RFC3484)
1401  */
1402 enum {
1403         IPV6_SADDR_RULE_INIT = 0,
1404         IPV6_SADDR_RULE_LOCAL,
1405         IPV6_SADDR_RULE_SCOPE,
1406         IPV6_SADDR_RULE_PREFERRED,
1407 #ifdef CONFIG_IPV6_MIP6
1408         IPV6_SADDR_RULE_HOA,
1409 #endif
1410         IPV6_SADDR_RULE_OIF,
1411         IPV6_SADDR_RULE_LABEL,
1412         IPV6_SADDR_RULE_PRIVACY,
1413         IPV6_SADDR_RULE_ORCHID,
1414         IPV6_SADDR_RULE_PREFIX,
1415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1416         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1417 #endif
1418         IPV6_SADDR_RULE_MAX
1419 };
1420
1421 struct ipv6_saddr_score {
1422         int                     rule;
1423         int                     addr_type;
1424         struct inet6_ifaddr     *ifa;
1425         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1426         int                     scopedist;
1427         int                     matchlen;
1428 };
1429
1430 struct ipv6_saddr_dst {
1431         const struct in6_addr *addr;
1432         int ifindex;
1433         int scope;
1434         int label;
1435         unsigned int prefs;
1436 };
1437
1438 static inline int ipv6_saddr_preferred(int type)
1439 {
1440         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1441                 return 1;
1442         return 0;
1443 }
1444
1445 static bool ipv6_use_optimistic_addr(struct net *net,
1446                                      struct inet6_dev *idev)
1447 {
1448 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1449         if (!idev)
1450                 return false;
1451         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1452                 return false;
1453         if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1454                 return false;
1455
1456         return true;
1457 #else
1458         return false;
1459 #endif
1460 }
1461
1462 static bool ipv6_allow_optimistic_dad(struct net *net,
1463                                       struct inet6_dev *idev)
1464 {
1465 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1466         if (!idev)
1467                 return false;
1468         if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1469                 return false;
1470
1471         return true;
1472 #else
1473         return false;
1474 #endif
1475 }
1476
1477 static int ipv6_get_saddr_eval(struct net *net,
1478                                struct ipv6_saddr_score *score,
1479                                struct ipv6_saddr_dst *dst,
1480                                int i)
1481 {
1482         int ret;
1483
1484         if (i <= score->rule) {
1485                 switch (i) {
1486                 case IPV6_SADDR_RULE_SCOPE:
1487                         ret = score->scopedist;
1488                         break;
1489                 case IPV6_SADDR_RULE_PREFIX:
1490                         ret = score->matchlen;
1491                         break;
1492                 default:
1493                         ret = !!test_bit(i, score->scorebits);
1494                 }
1495                 goto out;
1496         }
1497
1498         switch (i) {
1499         case IPV6_SADDR_RULE_INIT:
1500                 /* Rule 0: remember if hiscore is not ready yet */
1501                 ret = !!score->ifa;
1502                 break;
1503         case IPV6_SADDR_RULE_LOCAL:
1504                 /* Rule 1: Prefer same address */
1505                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1506                 break;
1507         case IPV6_SADDR_RULE_SCOPE:
1508                 /* Rule 2: Prefer appropriate scope
1509                  *
1510                  *      ret
1511                  *       ^
1512                  *    -1 |  d 15
1513                  *    ---+--+-+---> scope
1514                  *       |
1515                  *       |             d is scope of the destination.
1516                  *  B-d  |  \
1517                  *       |   \      <- smaller scope is better if
1518                  *  B-15 |    \        if scope is enough for destination.
1519                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1520                  * d-C-1 | /
1521                  *       |/         <- greater is better
1522                  *   -C  /             if scope is not enough for destination.
1523                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1524                  *
1525                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1526                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1527                  * Assume B = 0 and we get C > 29.
1528                  */
1529                 ret = __ipv6_addr_src_scope(score->addr_type);
1530                 if (ret >= dst->scope)
1531                         ret = -ret;
1532                 else
1533                         ret -= 128;     /* 30 is enough */
1534                 score->scopedist = ret;
1535                 break;
1536         case IPV6_SADDR_RULE_PREFERRED:
1537             {
1538                 /* Rule 3: Avoid deprecated and optimistic addresses */
1539                 u8 avoid = IFA_F_DEPRECATED;
1540
1541                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1542                         avoid |= IFA_F_OPTIMISTIC;
1543                 ret = ipv6_saddr_preferred(score->addr_type) ||
1544                       !(score->ifa->flags & avoid);
1545                 break;
1546             }
1547 #ifdef CONFIG_IPV6_MIP6
1548         case IPV6_SADDR_RULE_HOA:
1549             {
1550                 /* Rule 4: Prefer home address */
1551                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1552                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1553                 break;
1554             }
1555 #endif
1556         case IPV6_SADDR_RULE_OIF:
1557                 /* Rule 5: Prefer outgoing interface */
1558                 ret = (!dst->ifindex ||
1559                        dst->ifindex == score->ifa->idev->dev->ifindex);
1560                 break;
1561         case IPV6_SADDR_RULE_LABEL:
1562                 /* Rule 6: Prefer matching label */
1563                 ret = ipv6_addr_label(net,
1564                                       &score->ifa->addr, score->addr_type,
1565                                       score->ifa->idev->dev->ifindex) == dst->label;
1566                 break;
1567         case IPV6_SADDR_RULE_PRIVACY:
1568             {
1569                 /* Rule 7: Prefer public address
1570                  * Note: prefer temporary address if use_tempaddr >= 2
1571                  */
1572                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1573                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1574                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1575                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1576                 break;
1577             }
1578         case IPV6_SADDR_RULE_ORCHID:
1579                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1580                  *          non-ORCHID vs non-ORCHID
1581                  */
1582                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1583                         ipv6_addr_orchid(dst->addr));
1584                 break;
1585         case IPV6_SADDR_RULE_PREFIX:
1586                 /* Rule 8: Use longest matching prefix */
1587                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1588                 if (ret > score->ifa->prefix_len)
1589                         ret = score->ifa->prefix_len;
1590                 score->matchlen = ret;
1591                 break;
1592 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1593         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1594                 /* Optimistic addresses still have lower precedence than other
1595                  * preferred addresses.
1596                  */
1597                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1598                 break;
1599 #endif
1600         default:
1601                 ret = 0;
1602         }
1603
1604         if (ret)
1605                 __set_bit(i, score->scorebits);
1606         score->rule = i;
1607 out:
1608         return ret;
1609 }
1610
1611 static int __ipv6_dev_get_saddr(struct net *net,
1612                                 struct ipv6_saddr_dst *dst,
1613                                 struct inet6_dev *idev,
1614                                 struct ipv6_saddr_score *scores,
1615                                 int hiscore_idx)
1616 {
1617         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1618
1619         list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1620                 int i;
1621
1622                 /*
1623                  * - Tentative Address (RFC2462 section 5.4)
1624                  *  - A tentative address is not considered
1625                  *    "assigned to an interface" in the traditional
1626                  *    sense, unless it is also flagged as optimistic.
1627                  * - Candidate Source Address (section 4)
1628                  *  - In any case, anycast addresses, multicast
1629                  *    addresses, and the unspecified address MUST
1630                  *    NOT be included in a candidate set.
1631                  */
1632                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1633                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1634                         continue;
1635
1636                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1637
1638                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1639                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1640                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1641                                             idev->dev->name);
1642                         continue;
1643                 }
1644
1645                 score->rule = -1;
1646                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1647
1648                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1649                         int minihiscore, miniscore;
1650
1651                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1652                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1653
1654                         if (minihiscore > miniscore) {
1655                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1656                                     score->scopedist > 0) {
1657                                         /*
1658                                          * special case:
1659                                          * each remaining entry
1660                                          * has too small (not enough)
1661                                          * scope, because ifa entries
1662                                          * are sorted by their scope
1663                                          * values.
1664                                          */
1665                                         goto out;
1666                                 }
1667                                 break;
1668                         } else if (minihiscore < miniscore) {
1669                                 swap(hiscore, score);
1670                                 hiscore_idx = 1 - hiscore_idx;
1671
1672                                 /* restore our iterator */
1673                                 score->ifa = hiscore->ifa;
1674
1675                                 break;
1676                         }
1677                 }
1678         }
1679 out:
1680         return hiscore_idx;
1681 }
1682
1683 static int ipv6_get_saddr_master(struct net *net,
1684                                  const struct net_device *dst_dev,
1685                                  const struct net_device *master,
1686                                  struct ipv6_saddr_dst *dst,
1687                                  struct ipv6_saddr_score *scores,
1688                                  int hiscore_idx)
1689 {
1690         struct inet6_dev *idev;
1691
1692         idev = __in6_dev_get(dst_dev);
1693         if (idev)
1694                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1695                                                    scores, hiscore_idx);
1696
1697         idev = __in6_dev_get(master);
1698         if (idev)
1699                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1700                                                    scores, hiscore_idx);
1701
1702         return hiscore_idx;
1703 }
1704
1705 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1706                        const struct in6_addr *daddr, unsigned int prefs,
1707                        struct in6_addr *saddr)
1708 {
1709         struct ipv6_saddr_score scores[2], *hiscore;
1710         struct ipv6_saddr_dst dst;
1711         struct inet6_dev *idev;
1712         struct net_device *dev;
1713         int dst_type;
1714         bool use_oif_addr = false;
1715         int hiscore_idx = 0;
1716         int ret = 0;
1717
1718         dst_type = __ipv6_addr_type(daddr);
1719         dst.addr = daddr;
1720         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1721         dst.scope = __ipv6_addr_src_scope(dst_type);
1722         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1723         dst.prefs = prefs;
1724
1725         scores[hiscore_idx].rule = -1;
1726         scores[hiscore_idx].ifa = NULL;
1727
1728         rcu_read_lock();
1729
1730         /* Candidate Source Address (section 4)
1731          *  - multicast and link-local destination address,
1732          *    the set of candidate source address MUST only
1733          *    include addresses assigned to interfaces
1734          *    belonging to the same link as the outgoing
1735          *    interface.
1736          * (- For site-local destination addresses, the
1737          *    set of candidate source addresses MUST only
1738          *    include addresses assigned to interfaces
1739          *    belonging to the same site as the outgoing
1740          *    interface.)
1741          *  - "It is RECOMMENDED that the candidate source addresses
1742          *    be the set of unicast addresses assigned to the
1743          *    interface that will be used to send to the destination
1744          *    (the 'outgoing' interface)." (RFC 6724)
1745          */
1746         if (dst_dev) {
1747                 idev = __in6_dev_get(dst_dev);
1748                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1749                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1750                     (idev && idev->cnf.use_oif_addrs_only)) {
1751                         use_oif_addr = true;
1752                 }
1753         }
1754
1755         if (use_oif_addr) {
1756                 if (idev)
1757                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1758         } else {
1759                 const struct net_device *master;
1760                 int master_idx = 0;
1761
1762                 /* if dst_dev exists and is enslaved to an L3 device, then
1763                  * prefer addresses from dst_dev and then the master over
1764                  * any other enslaved devices in the L3 domain.
1765                  */
1766                 master = l3mdev_master_dev_rcu(dst_dev);
1767                 if (master) {
1768                         master_idx = master->ifindex;
1769
1770                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1771                                                             master, &dst,
1772                                                             scores, hiscore_idx);
1773
1774                         if (scores[hiscore_idx].ifa)
1775                                 goto out;
1776                 }
1777
1778                 for_each_netdev_rcu(net, dev) {
1779                         /* only consider addresses on devices in the
1780                          * same L3 domain
1781                          */
1782                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1783                                 continue;
1784                         idev = __in6_dev_get(dev);
1785                         if (!idev)
1786                                 continue;
1787                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1788                 }
1789         }
1790
1791 out:
1792         hiscore = &scores[hiscore_idx];
1793         if (!hiscore->ifa)
1794                 ret = -EADDRNOTAVAIL;
1795         else
1796                 *saddr = hiscore->ifa->addr;
1797
1798         rcu_read_unlock();
1799         return ret;
1800 }
1801 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1802
1803 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1804                       u32 banned_flags)
1805 {
1806         struct inet6_ifaddr *ifp;
1807         int err = -EADDRNOTAVAIL;
1808
1809         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1810                 if (ifp->scope > IFA_LINK)
1811                         break;
1812                 if (ifp->scope == IFA_LINK &&
1813                     !(ifp->flags & banned_flags)) {
1814                         *addr = ifp->addr;
1815                         err = 0;
1816                         break;
1817                 }
1818         }
1819         return err;
1820 }
1821
1822 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1823                     u32 banned_flags)
1824 {
1825         struct inet6_dev *idev;
1826         int err = -EADDRNOTAVAIL;
1827
1828         rcu_read_lock();
1829         idev = __in6_dev_get(dev);
1830         if (idev) {
1831                 read_lock_bh(&idev->lock);
1832                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1833                 read_unlock_bh(&idev->lock);
1834         }
1835         rcu_read_unlock();
1836         return err;
1837 }
1838
1839 static int ipv6_count_addresses(const struct inet6_dev *idev)
1840 {
1841         const struct inet6_ifaddr *ifp;
1842         int cnt = 0;
1843
1844         rcu_read_lock();
1845         list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1846                 cnt++;
1847         rcu_read_unlock();
1848         return cnt;
1849 }
1850
1851 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1852                   const struct net_device *dev, int strict)
1853 {
1854         return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1855                                        strict, IFA_F_TENTATIVE);
1856 }
1857 EXPORT_SYMBOL(ipv6_chk_addr);
1858
1859 /* device argument is used to find the L3 domain of interest. If
1860  * skip_dev_check is set, then the ifp device is not checked against
1861  * the passed in dev argument. So the 2 cases for addresses checks are:
1862  *   1. does the address exist in the L3 domain that dev is part of
1863  *      (skip_dev_check = true), or
1864  *
1865  *   2. does the address exist on the specific device
1866  *      (skip_dev_check = false)
1867  */
1868 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1869                             const struct net_device *dev, bool skip_dev_check,
1870                             int strict, u32 banned_flags)
1871 {
1872         unsigned int hash = inet6_addr_hash(net, addr);
1873         const struct net_device *l3mdev;
1874         struct inet6_ifaddr *ifp;
1875         u32 ifp_flags;
1876
1877         rcu_read_lock();
1878
1879         l3mdev = l3mdev_master_dev_rcu(dev);
1880         if (skip_dev_check)
1881                 dev = NULL;
1882
1883         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1884                 if (!net_eq(dev_net(ifp->idev->dev), net))
1885                         continue;
1886
1887                 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1888                         continue;
1889
1890                 /* Decouple optimistic from tentative for evaluation here.
1891                  * Ban optimistic addresses explicitly, when required.
1892                  */
1893                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1894                             ? (ifp->flags&~IFA_F_TENTATIVE)
1895                             : ifp->flags;
1896                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1897                     !(ifp_flags&banned_flags) &&
1898                     (!dev || ifp->idev->dev == dev ||
1899                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1900                         rcu_read_unlock();
1901                         return 1;
1902                 }
1903         }
1904
1905         rcu_read_unlock();
1906         return 0;
1907 }
1908 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1909
1910
1911 /* Compares an address/prefix_len with addresses on device @dev.
1912  * If one is found it returns true.
1913  */
1914 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1915         const unsigned int prefix_len, struct net_device *dev)
1916 {
1917         const struct inet6_ifaddr *ifa;
1918         const struct inet6_dev *idev;
1919         bool ret = false;
1920
1921         rcu_read_lock();
1922         idev = __in6_dev_get(dev);
1923         if (idev) {
1924                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1925                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1926                         if (ret)
1927                                 break;
1928                 }
1929         }
1930         rcu_read_unlock();
1931
1932         return ret;
1933 }
1934 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1935
1936 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1937 {
1938         const struct inet6_ifaddr *ifa;
1939         const struct inet6_dev *idev;
1940         int     onlink;
1941
1942         onlink = 0;
1943         rcu_read_lock();
1944         idev = __in6_dev_get(dev);
1945         if (idev) {
1946                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1947                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1948                                                    ifa->prefix_len);
1949                         if (onlink)
1950                                 break;
1951                 }
1952         }
1953         rcu_read_unlock();
1954         return onlink;
1955 }
1956 EXPORT_SYMBOL(ipv6_chk_prefix);
1957
1958 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1959                                      struct net_device *dev, int strict)
1960 {
1961         unsigned int hash = inet6_addr_hash(net, addr);
1962         struct inet6_ifaddr *ifp, *result = NULL;
1963
1964         rcu_read_lock();
1965         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1966                 if (!net_eq(dev_net(ifp->idev->dev), net))
1967                         continue;
1968                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1969                         if (!dev || ifp->idev->dev == dev ||
1970                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1971                                 result = ifp;
1972                                 in6_ifa_hold(ifp);
1973                                 break;
1974                         }
1975                 }
1976         }
1977         rcu_read_unlock();
1978
1979         return result;
1980 }
1981
1982 /* Gets referenced address, destroys ifaddr */
1983
1984 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1985 {
1986         if (dad_failed)
1987                 ifp->flags |= IFA_F_DADFAILED;
1988
1989         if (ifp->flags&IFA_F_TEMPORARY) {
1990                 struct inet6_ifaddr *ifpub;
1991                 spin_lock_bh(&ifp->lock);
1992                 ifpub = ifp->ifpub;
1993                 if (ifpub) {
1994                         in6_ifa_hold(ifpub);
1995                         spin_unlock_bh(&ifp->lock);
1996                         ipv6_create_tempaddr(ifpub, ifp, true);
1997                         in6_ifa_put(ifpub);
1998                 } else {
1999                         spin_unlock_bh(&ifp->lock);
2000                 }
2001                 ipv6_del_addr(ifp);
2002         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2003                 spin_lock_bh(&ifp->lock);
2004                 addrconf_del_dad_work(ifp);
2005                 ifp->flags |= IFA_F_TENTATIVE;
2006                 if (dad_failed)
2007                         ifp->flags &= ~IFA_F_OPTIMISTIC;
2008                 spin_unlock_bh(&ifp->lock);
2009                 if (dad_failed)
2010                         ipv6_ifa_notify(0, ifp);
2011                 in6_ifa_put(ifp);
2012         } else {
2013                 ipv6_del_addr(ifp);
2014         }
2015 }
2016
2017 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2018 {
2019         int err = -ENOENT;
2020
2021         spin_lock_bh(&ifp->lock);
2022         if (ifp->state == INET6_IFADDR_STATE_DAD) {
2023                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2024                 err = 0;
2025         }
2026         spin_unlock_bh(&ifp->lock);
2027
2028         return err;
2029 }
2030
2031 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2032 {
2033         struct inet6_dev *idev = ifp->idev;
2034         struct net *net = dev_net(ifp->idev->dev);
2035
2036         if (addrconf_dad_end(ifp)) {
2037                 in6_ifa_put(ifp);
2038                 return;
2039         }
2040
2041         net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2042                              ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2043
2044         spin_lock_bh(&ifp->lock);
2045
2046         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2047                 int scope = ifp->scope;
2048                 u32 flags = ifp->flags;
2049                 struct in6_addr new_addr;
2050                 struct inet6_ifaddr *ifp2;
2051                 u32 valid_lft, preferred_lft;
2052                 int pfxlen = ifp->prefix_len;
2053                 int retries = ifp->stable_privacy_retry + 1;
2054
2055                 if (retries > net->ipv6.sysctl.idgen_retries) {
2056                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2057                                              ifp->idev->dev->name);
2058                         goto errdad;
2059                 }
2060
2061                 new_addr = ifp->addr;
2062                 if (ipv6_generate_stable_address(&new_addr, retries,
2063                                                  idev))
2064                         goto errdad;
2065
2066                 valid_lft = ifp->valid_lft;
2067                 preferred_lft = ifp->prefered_lft;
2068
2069                 spin_unlock_bh(&ifp->lock);
2070
2071                 if (idev->cnf.max_addresses &&
2072                     ipv6_count_addresses(idev) >=
2073                     idev->cnf.max_addresses)
2074                         goto lock_errdad;
2075
2076                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2077                                      ifp->idev->dev->name);
2078
2079                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2080                                      scope, flags, valid_lft,
2081                                      preferred_lft, false, NULL);
2082                 if (IS_ERR(ifp2))
2083                         goto lock_errdad;
2084
2085                 spin_lock_bh(&ifp2->lock);
2086                 ifp2->stable_privacy_retry = retries;
2087                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2088                 spin_unlock_bh(&ifp2->lock);
2089
2090                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2091                 in6_ifa_put(ifp2);
2092 lock_errdad:
2093                 spin_lock_bh(&ifp->lock);
2094         }
2095
2096 errdad:
2097         /* transition from _POSTDAD to _ERRDAD */
2098         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2099         spin_unlock_bh(&ifp->lock);
2100
2101         addrconf_mod_dad_work(ifp, 0);
2102         in6_ifa_put(ifp);
2103 }
2104
2105 /* Join to solicited addr multicast group.
2106  * caller must hold RTNL */
2107 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2108 {
2109         struct in6_addr maddr;
2110
2111         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2112                 return;
2113
2114         addrconf_addr_solict_mult(addr, &maddr);
2115         ipv6_dev_mc_inc(dev, &maddr);
2116 }
2117
2118 /* caller must hold RTNL */
2119 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2120 {
2121         struct in6_addr maddr;
2122
2123         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2124                 return;
2125
2126         addrconf_addr_solict_mult(addr, &maddr);
2127         __ipv6_dev_mc_dec(idev, &maddr);
2128 }
2129
2130 /* caller must hold RTNL */
2131 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2132 {
2133         struct in6_addr addr;
2134
2135         if (ifp->prefix_len >= 127) /* RFC 6164 */
2136                 return;
2137         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2138         if (ipv6_addr_any(&addr))
2139                 return;
2140         __ipv6_dev_ac_inc(ifp->idev, &addr);
2141 }
2142
2143 /* caller must hold RTNL */
2144 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2145 {
2146         struct in6_addr addr;
2147
2148         if (ifp->prefix_len >= 127) /* RFC 6164 */
2149                 return;
2150         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2151         if (ipv6_addr_any(&addr))
2152                 return;
2153         __ipv6_dev_ac_dec(ifp->idev, &addr);
2154 }
2155
2156 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2157 {
2158         switch (dev->addr_len) {
2159         case ETH_ALEN:
2160                 memcpy(eui, dev->dev_addr, 3);
2161                 eui[3] = 0xFF;
2162                 eui[4] = 0xFE;
2163                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2164                 break;
2165         case EUI64_ADDR_LEN:
2166                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2167                 eui[0] ^= 2;
2168                 break;
2169         default:
2170                 return -1;
2171         }
2172
2173         return 0;
2174 }
2175
2176 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2177 {
2178         union fwnet_hwaddr *ha;
2179
2180         if (dev->addr_len != FWNET_ALEN)
2181                 return -1;
2182
2183         ha = (union fwnet_hwaddr *)dev->dev_addr;
2184
2185         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2186         eui[0] ^= 2;
2187         return 0;
2188 }
2189
2190 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2191 {
2192         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2193         if (dev->addr_len != ARCNET_ALEN)
2194                 return -1;
2195         memset(eui, 0, 7);
2196         eui[7] = *(u8 *)dev->dev_addr;
2197         return 0;
2198 }
2199
2200 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2201 {
2202         if (dev->addr_len != INFINIBAND_ALEN)
2203                 return -1;
2204         memcpy(eui, dev->dev_addr + 12, 8);
2205         eui[0] |= 2;
2206         return 0;
2207 }
2208
2209 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2210 {
2211         if (addr == 0)
2212                 return -1;
2213         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2214                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2215                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2216                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2217                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2218                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2219         eui[1] = 0;
2220         eui[2] = 0x5E;
2221         eui[3] = 0xFE;
2222         memcpy(eui + 4, &addr, 4);
2223         return 0;
2224 }
2225
2226 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2227 {
2228         if (dev->priv_flags & IFF_ISATAP)
2229                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2230         return -1;
2231 }
2232
2233 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2234 {
2235         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2236 }
2237
2238 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2239 {
2240         memcpy(eui, dev->perm_addr, 3);
2241         memcpy(eui + 5, dev->perm_addr + 3, 3);
2242         eui[3] = 0xFF;
2243         eui[4] = 0xFE;
2244         eui[0] ^= 2;
2245         return 0;
2246 }
2247
2248 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2249 {
2250         switch (dev->type) {
2251         case ARPHRD_ETHER:
2252         case ARPHRD_FDDI:
2253                 return addrconf_ifid_eui48(eui, dev);
2254         case ARPHRD_ARCNET:
2255                 return addrconf_ifid_arcnet(eui, dev);
2256         case ARPHRD_INFINIBAND:
2257                 return addrconf_ifid_infiniband(eui, dev);
2258         case ARPHRD_SIT:
2259                 return addrconf_ifid_sit(eui, dev);
2260         case ARPHRD_IPGRE:
2261         case ARPHRD_TUNNEL:
2262                 return addrconf_ifid_gre(eui, dev);
2263         case ARPHRD_6LOWPAN:
2264                 return addrconf_ifid_6lowpan(eui, dev);
2265         case ARPHRD_IEEE1394:
2266                 return addrconf_ifid_ieee1394(eui, dev);
2267         case ARPHRD_TUNNEL6:
2268         case ARPHRD_IP6GRE:
2269                 return addrconf_ifid_ip6tnl(eui, dev);
2270         }
2271         return -1;
2272 }
2273
2274 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2275 {
2276         int err = -1;
2277         struct inet6_ifaddr *ifp;
2278
2279         read_lock_bh(&idev->lock);
2280         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2281                 if (ifp->scope > IFA_LINK)
2282                         break;
2283                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2284                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2285                         err = 0;
2286                         break;
2287                 }
2288         }
2289         read_unlock_bh(&idev->lock);
2290         return err;
2291 }
2292
2293 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2294 static void ipv6_regen_rndid(struct inet6_dev *idev)
2295 {
2296 regen:
2297         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2298         idev->rndid[0] &= ~0x02;
2299
2300         /*
2301          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2302          * check if generated address is not inappropriate
2303          *
2304          *  - Reserved subnet anycast (RFC 2526)
2305          *      11111101 11....11 1xxxxxxx
2306          *  - ISATAP (RFC4214) 6.1
2307          *      00-00-5E-FE-xx-xx-xx-xx
2308          *  - value 0
2309          *  - XXX: already assigned to an address on the device
2310          */
2311         if (idev->rndid[0] == 0xfd &&
2312             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2313             (idev->rndid[7]&0x80))
2314                 goto regen;
2315         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2316                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2317                         goto regen;
2318                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2319                         goto regen;
2320         }
2321 }
2322
2323 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2324 {
2325         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2326                 ipv6_regen_rndid(idev);
2327 }
2328
2329 /*
2330  *      Add prefix route.
2331  */
2332
2333 static void
2334 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2335                       unsigned long expires, u32 flags)
2336 {
2337         struct fib6_config cfg = {
2338                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2339                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2340                 .fc_ifindex = dev->ifindex,
2341                 .fc_expires = expires,
2342                 .fc_dst_len = plen,
2343                 .fc_flags = RTF_UP | flags,
2344                 .fc_nlinfo.nl_net = dev_net(dev),
2345                 .fc_protocol = RTPROT_KERNEL,
2346         };
2347
2348         cfg.fc_dst = *pfx;
2349
2350         /* Prevent useless cloning on PtP SIT.
2351            This thing is done here expecting that the whole
2352            class of non-broadcast devices need not cloning.
2353          */
2354 #if IS_ENABLED(CONFIG_IPV6_SIT)
2355         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2356                 cfg.fc_flags |= RTF_NONEXTHOP;
2357 #endif
2358
2359         ip6_route_add(&cfg, NULL);
2360 }
2361
2362
2363 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2364                                                   int plen,
2365                                                   const struct net_device *dev,
2366                                                   u32 flags, u32 noflags)
2367 {
2368         struct fib6_node *fn;
2369         struct rt6_info *rt = NULL;
2370         struct fib6_table *table;
2371         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2372
2373         table = fib6_get_table(dev_net(dev), tb_id);
2374         if (!table)
2375                 return NULL;
2376
2377         rcu_read_lock();
2378         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2379         if (!fn)
2380                 goto out;
2381
2382         for_each_fib6_node_rt_rcu(fn) {
2383                 if (rt->dst.dev->ifindex != dev->ifindex)
2384                         continue;
2385                 if ((rt->rt6i_flags & flags) != flags)
2386                         continue;
2387                 if ((rt->rt6i_flags & noflags) != 0)
2388                         continue;
2389                 if (!dst_hold_safe(&rt->dst))
2390                         rt = NULL;
2391                 break;
2392         }
2393 out:
2394         rcu_read_unlock();
2395         return rt;
2396 }
2397
2398
2399 /* Create "default" multicast route to the interface */
2400
2401 static void addrconf_add_mroute(struct net_device *dev)
2402 {
2403         struct fib6_config cfg = {
2404                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2405                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2406                 .fc_ifindex = dev->ifindex,
2407                 .fc_dst_len = 8,
2408                 .fc_flags = RTF_UP,
2409                 .fc_nlinfo.nl_net = dev_net(dev),
2410         };
2411
2412         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2413
2414         ip6_route_add(&cfg, NULL);
2415 }
2416
2417 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2418 {
2419         struct inet6_dev *idev;
2420
2421         ASSERT_RTNL();
2422
2423         idev = ipv6_find_idev(dev);
2424         if (!idev)
2425                 return ERR_PTR(-ENOBUFS);
2426
2427         if (idev->cnf.disable_ipv6)
2428                 return ERR_PTR(-EACCES);
2429
2430         /* Add default multicast route */
2431         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2432                 addrconf_add_mroute(dev);
2433
2434         return idev;
2435 }
2436
2437 static void manage_tempaddrs(struct inet6_dev *idev,
2438                              struct inet6_ifaddr *ifp,
2439                              __u32 valid_lft, __u32 prefered_lft,
2440                              bool create, unsigned long now)
2441 {
2442         u32 flags;
2443         struct inet6_ifaddr *ift;
2444
2445         read_lock_bh(&idev->lock);
2446         /* update all temporary addresses in the list */
2447         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2448                 int age, max_valid, max_prefered;
2449
2450                 if (ifp != ift->ifpub)
2451                         continue;
2452
2453                 /* RFC 4941 section 3.3:
2454                  * If a received option will extend the lifetime of a public
2455                  * address, the lifetimes of temporary addresses should
2456                  * be extended, subject to the overall constraint that no
2457                  * temporary addresses should ever remain "valid" or "preferred"
2458                  * for a time longer than (TEMP_VALID_LIFETIME) or
2459                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2460                  */
2461                 age = (now - ift->cstamp) / HZ;
2462                 max_valid = idev->cnf.temp_valid_lft - age;
2463                 if (max_valid < 0)
2464                         max_valid = 0;
2465
2466                 max_prefered = idev->cnf.temp_prefered_lft -
2467                                idev->desync_factor - age;
2468                 if (max_prefered < 0)
2469                         max_prefered = 0;
2470
2471                 if (valid_lft > max_valid)
2472                         valid_lft = max_valid;
2473
2474                 if (prefered_lft > max_prefered)
2475                         prefered_lft = max_prefered;
2476
2477                 spin_lock(&ift->lock);
2478                 flags = ift->flags;
2479                 ift->valid_lft = valid_lft;
2480                 ift->prefered_lft = prefered_lft;
2481                 ift->tstamp = now;
2482                 if (prefered_lft > 0)
2483                         ift->flags &= ~IFA_F_DEPRECATED;
2484
2485                 spin_unlock(&ift->lock);
2486                 if (!(flags&IFA_F_TENTATIVE))
2487                         ipv6_ifa_notify(0, ift);
2488         }
2489
2490         if ((create || list_empty(&idev->tempaddr_list)) &&
2491             idev->cnf.use_tempaddr > 0) {
2492                 /* When a new public address is created as described
2493                  * in [ADDRCONF], also create a new temporary address.
2494                  * Also create a temporary address if it's enabled but
2495                  * no temporary address currently exists.
2496                  */
2497                 read_unlock_bh(&idev->lock);
2498                 ipv6_create_tempaddr(ifp, NULL, false);
2499         } else {
2500                 read_unlock_bh(&idev->lock);
2501         }
2502 }
2503
2504 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2505 {
2506         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2507                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2508 }
2509
2510 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2511                                  const struct prefix_info *pinfo,
2512                                  struct inet6_dev *in6_dev,
2513                                  const struct in6_addr *addr, int addr_type,
2514                                  u32 addr_flags, bool sllao, bool tokenized,
2515                                  __u32 valid_lft, u32 prefered_lft)
2516 {
2517         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2518         int create = 0, update_lft = 0;
2519
2520         if (!ifp && valid_lft) {
2521                 int max_addresses = in6_dev->cnf.max_addresses;
2522
2523 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2524                 if ((net->ipv6.devconf_all->optimistic_dad ||
2525                      in6_dev->cnf.optimistic_dad) &&
2526                     !net->ipv6.devconf_all->forwarding && sllao)
2527                         addr_flags |= IFA_F_OPTIMISTIC;
2528 #endif
2529
2530                 /* Do not allow to create too much of autoconfigured
2531                  * addresses; this would be too easy way to crash kernel.
2532                  */
2533                 if (!max_addresses ||
2534                     ipv6_count_addresses(in6_dev) < max_addresses)
2535                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2536                                             pinfo->prefix_len,
2537                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2538                                             addr_flags, valid_lft,
2539                                             prefered_lft, false, NULL);
2540
2541                 if (IS_ERR_OR_NULL(ifp))
2542                         return -1;
2543
2544                 update_lft = 0;
2545                 create = 1;
2546                 spin_lock_bh(&ifp->lock);
2547                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2548                 ifp->cstamp = jiffies;
2549                 ifp->tokenized = tokenized;
2550                 spin_unlock_bh(&ifp->lock);
2551                 addrconf_dad_start(ifp);
2552         }
2553
2554         if (ifp) {
2555                 u32 flags;
2556                 unsigned long now;
2557                 u32 stored_lft;
2558
2559                 /* update lifetime (RFC2462 5.5.3 e) */
2560                 spin_lock_bh(&ifp->lock);
2561                 now = jiffies;
2562                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2563                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2564                 else
2565                         stored_lft = 0;
2566                 if (!update_lft && !create && stored_lft) {
2567                         const u32 minimum_lft = min_t(u32,
2568                                 stored_lft, MIN_VALID_LIFETIME);
2569                         valid_lft = max(valid_lft, minimum_lft);
2570
2571                         /* RFC4862 Section 5.5.3e:
2572                          * "Note that the preferred lifetime of the
2573                          *  corresponding address is always reset to
2574                          *  the Preferred Lifetime in the received
2575                          *  Prefix Information option, regardless of
2576                          *  whether the valid lifetime is also reset or
2577                          *  ignored."
2578                          *
2579                          * So we should always update prefered_lft here.
2580                          */
2581                         update_lft = 1;
2582                 }
2583
2584                 if (update_lft) {
2585                         ifp->valid_lft = valid_lft;
2586                         ifp->prefered_lft = prefered_lft;
2587                         ifp->tstamp = now;
2588                         flags = ifp->flags;
2589                         ifp->flags &= ~IFA_F_DEPRECATED;
2590                         spin_unlock_bh(&ifp->lock);
2591
2592                         if (!(flags&IFA_F_TENTATIVE))
2593                                 ipv6_ifa_notify(0, ifp);
2594                 } else
2595                         spin_unlock_bh(&ifp->lock);
2596
2597                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2598                                  create, now);
2599
2600                 in6_ifa_put(ifp);
2601                 addrconf_verify();
2602         }
2603
2604         return 0;
2605 }
2606 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2607
2608 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2609 {
2610         struct prefix_info *pinfo;
2611         __u32 valid_lft;
2612         __u32 prefered_lft;
2613         int addr_type, err;
2614         u32 addr_flags = 0;
2615         struct inet6_dev *in6_dev;
2616         struct net *net = dev_net(dev);
2617
2618         pinfo = (struct prefix_info *) opt;
2619
2620         if (len < sizeof(struct prefix_info)) {
2621                 ADBG("addrconf: prefix option too short\n");
2622                 return;
2623         }
2624
2625         /*
2626          *      Validation checks ([ADDRCONF], page 19)
2627          */
2628
2629         addr_type = ipv6_addr_type(&pinfo->prefix);
2630
2631         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2632                 return;
2633
2634         valid_lft = ntohl(pinfo->valid);
2635         prefered_lft = ntohl(pinfo->prefered);
2636
2637         if (prefered_lft > valid_lft) {
2638                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2639                 return;
2640         }
2641
2642         in6_dev = in6_dev_get(dev);
2643
2644         if (!in6_dev) {
2645                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2646                                     dev->name);
2647                 return;
2648         }
2649
2650         /*
2651          *      Two things going on here:
2652          *      1) Add routes for on-link prefixes
2653          *      2) Configure prefixes with the auto flag set
2654          */
2655
2656         if (pinfo->onlink) {
2657                 struct rt6_info *rt;
2658                 unsigned long rt_expires;
2659
2660                 /* Avoid arithmetic overflow. Really, we could
2661                  * save rt_expires in seconds, likely valid_lft,
2662                  * but it would require division in fib gc, that it
2663                  * not good.
2664                  */
2665                 if (HZ > USER_HZ)
2666                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2667                 else
2668                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2669
2670                 if (addrconf_finite_timeout(rt_expires))
2671                         rt_expires *= HZ;
2672
2673                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2674                                                pinfo->prefix_len,
2675                                                dev,
2676                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2677                                                RTF_GATEWAY | RTF_DEFAULT);
2678
2679                 if (rt) {
2680                         /* Autoconf prefix route */
2681                         if (valid_lft == 0) {
2682                                 ip6_del_rt(rt);
2683                                 rt = NULL;
2684                         } else if (addrconf_finite_timeout(rt_expires)) {
2685                                 /* not infinity */
2686                                 rt6_set_expires(rt, jiffies + rt_expires);
2687                         } else {
2688                                 rt6_clean_expires(rt);
2689                         }
2690                 } else if (valid_lft) {
2691                         clock_t expires = 0;
2692                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2693                         if (addrconf_finite_timeout(rt_expires)) {
2694                                 /* not infinity */
2695                                 flags |= RTF_EXPIRES;
2696                                 expires = jiffies_to_clock_t(rt_expires);
2697                         }
2698                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2699                                               dev, expires, flags);
2700                 }
2701                 ip6_rt_put(rt);
2702         }
2703
2704         /* Try to figure out our local address for this prefix */
2705
2706         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2707                 struct in6_addr addr;
2708                 bool tokenized = false, dev_addr_generated = false;
2709
2710                 if (pinfo->prefix_len == 64) {
2711                         memcpy(&addr, &pinfo->prefix, 8);
2712
2713                         if (!ipv6_addr_any(&in6_dev->token)) {
2714                                 read_lock_bh(&in6_dev->lock);
2715                                 memcpy(addr.s6_addr + 8,
2716                                        in6_dev->token.s6_addr + 8, 8);
2717                                 read_unlock_bh(&in6_dev->lock);
2718                                 tokenized = true;
2719                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2720                                    !ipv6_generate_stable_address(&addr, 0,
2721                                                                  in6_dev)) {
2722                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2723                                 goto ok;
2724                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2725                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2726                                 goto put;
2727                         } else {
2728                                 dev_addr_generated = true;
2729                         }
2730                         goto ok;
2731                 }
2732                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2733                                     pinfo->prefix_len);
2734                 goto put;
2735
2736 ok:
2737                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2738                                                    &addr, addr_type,
2739                                                    addr_flags, sllao,
2740                                                    tokenized, valid_lft,
2741                                                    prefered_lft);
2742                 if (err)
2743                         goto put;
2744
2745                 /* Ignore error case here because previous prefix add addr was
2746                  * successful which will be notified.
2747                  */
2748                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2749                                               addr_type, addr_flags, sllao,
2750                                               tokenized, valid_lft,
2751                                               prefered_lft,
2752                                               dev_addr_generated);
2753         }
2754         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2755 put:
2756         in6_dev_put(in6_dev);
2757 }
2758
2759 /*
2760  *      Set destination address.
2761  *      Special case for SIT interfaces where we create a new "virtual"
2762  *      device.
2763  */
2764 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2765 {
2766         struct in6_ifreq ireq;
2767         struct net_device *dev;
2768         int err = -EINVAL;
2769
2770         rtnl_lock();
2771
2772         err = -EFAULT;
2773         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2774                 goto err_exit;
2775
2776         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2777
2778         err = -ENODEV;
2779         if (!dev)
2780                 goto err_exit;
2781
2782 #if IS_ENABLED(CONFIG_IPV6_SIT)
2783         if (dev->type == ARPHRD_SIT) {
2784                 const struct net_device_ops *ops = dev->netdev_ops;
2785                 struct ifreq ifr;
2786                 struct ip_tunnel_parm p;
2787
2788                 err = -EADDRNOTAVAIL;
2789                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2790                         goto err_exit;
2791
2792                 memset(&p, 0, sizeof(p));
2793                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2794                 p.iph.saddr = 0;
2795                 p.iph.version = 4;
2796                 p.iph.ihl = 5;
2797                 p.iph.protocol = IPPROTO_IPV6;
2798                 p.iph.ttl = 64;
2799                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2800
2801                 if (ops->ndo_do_ioctl) {
2802                         mm_segment_t oldfs = get_fs();
2803
2804                         set_fs(KERNEL_DS);
2805                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2806                         set_fs(oldfs);
2807                 } else
2808                         err = -EOPNOTSUPP;
2809
2810                 if (err == 0) {
2811                         err = -ENOBUFS;
2812                         dev = __dev_get_by_name(net, p.name);
2813                         if (!dev)
2814                                 goto err_exit;
2815                         err = dev_open(dev);
2816                 }
2817         }
2818 #endif
2819
2820 err_exit:
2821         rtnl_unlock();
2822         return err;
2823 }
2824
2825 static int ipv6_mc_config(struct sock *sk, bool join,
2826                           const struct in6_addr *addr, int ifindex)
2827 {
2828         int ret;
2829
2830         ASSERT_RTNL();
2831
2832         lock_sock(sk);
2833         if (join)
2834                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2835         else
2836                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2837         release_sock(sk);
2838
2839         return ret;
2840 }
2841
2842 /*
2843  *      Manual configuration of address on an interface
2844  */
2845 static int inet6_addr_add(struct net *net, int ifindex,
2846                           const struct in6_addr *pfx,
2847                           const struct in6_addr *peer_pfx,
2848                           unsigned int plen, __u32 ifa_flags,
2849                           __u32 prefered_lft, __u32 valid_lft,
2850                           struct netlink_ext_ack *extack)
2851 {
2852         struct inet6_ifaddr *ifp;
2853         struct inet6_dev *idev;
2854         struct net_device *dev;
2855         unsigned long timeout;
2856         clock_t expires;
2857         int scope;
2858         u32 flags;
2859
2860         ASSERT_RTNL();
2861
2862         if (plen > 128)
2863                 return -EINVAL;
2864
2865         /* check the lifetime */
2866         if (!valid_lft || prefered_lft > valid_lft)
2867                 return -EINVAL;
2868
2869         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2870                 return -EINVAL;
2871
2872         dev = __dev_get_by_index(net, ifindex);
2873         if (!dev)
2874                 return -ENODEV;
2875
2876         idev = addrconf_add_dev(dev);
2877         if (IS_ERR(idev))
2878                 return PTR_ERR(idev);
2879
2880         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2881                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2882                                          true, pfx, ifindex);
2883
2884                 if (ret < 0)
2885                         return ret;
2886         }
2887
2888         scope = ipv6_addr_scope(pfx);
2889
2890         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2891         if (addrconf_finite_timeout(timeout)) {
2892                 expires = jiffies_to_clock_t(timeout * HZ);
2893                 valid_lft = timeout;
2894                 flags = RTF_EXPIRES;
2895         } else {
2896                 expires = 0;
2897                 flags = 0;
2898                 ifa_flags |= IFA_F_PERMANENT;
2899         }
2900
2901         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2902         if (addrconf_finite_timeout(timeout)) {
2903                 if (timeout == 0)
2904                         ifa_flags |= IFA_F_DEPRECATED;
2905                 prefered_lft = timeout;
2906         }
2907
2908         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2909                             valid_lft, prefered_lft, true, extack);
2910
2911         if (!IS_ERR(ifp)) {
2912                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2913                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2914                                               expires, flags);
2915                 }
2916
2917                 /*
2918                  * Note that section 3.1 of RFC 4429 indicates
2919                  * that the Optimistic flag should not be set for
2920                  * manually configured addresses
2921                  */
2922                 addrconf_dad_start(ifp);
2923                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2924                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2925                                          true, jiffies);
2926                 in6_ifa_put(ifp);
2927                 addrconf_verify_rtnl();
2928                 return 0;
2929         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2930                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2931                                false, pfx, ifindex);
2932         }
2933
2934         return PTR_ERR(ifp);
2935 }
2936
2937 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2938                           const struct in6_addr *pfx, unsigned int plen)
2939 {
2940         struct inet6_ifaddr *ifp;
2941         struct inet6_dev *idev;
2942         struct net_device *dev;
2943
2944         if (plen > 128)
2945                 return -EINVAL;
2946
2947         dev = __dev_get_by_index(net, ifindex);
2948         if (!dev)
2949                 return -ENODEV;
2950
2951         idev = __in6_dev_get(dev);
2952         if (!idev)
2953                 return -ENXIO;
2954
2955         read_lock_bh(&idev->lock);
2956         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2957                 if (ifp->prefix_len == plen &&
2958                     ipv6_addr_equal(pfx, &ifp->addr)) {
2959                         in6_ifa_hold(ifp);
2960                         read_unlock_bh(&idev->lock);
2961
2962                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2963                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2964                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2965                                                  jiffies);
2966                         ipv6_del_addr(ifp);
2967                         addrconf_verify_rtnl();
2968                         if (ipv6_addr_is_multicast(pfx)) {
2969                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2970                                                false, pfx, dev->ifindex);
2971                         }
2972                         return 0;
2973                 }
2974         }
2975         read_unlock_bh(&idev->lock);
2976         return -EADDRNOTAVAIL;
2977 }
2978
2979
2980 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2981 {
2982         struct in6_ifreq ireq;
2983         int err;
2984
2985         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2986                 return -EPERM;
2987
2988         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2989                 return -EFAULT;
2990
2991         rtnl_lock();
2992         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2993                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2994                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL);
2995         rtnl_unlock();
2996         return err;
2997 }
2998
2999 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3000 {
3001         struct in6_ifreq ireq;
3002         int err;
3003
3004         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3005                 return -EPERM;
3006
3007         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3008                 return -EFAULT;
3009
3010         rtnl_lock();
3011         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3012                              ireq.ifr6_prefixlen);
3013         rtnl_unlock();
3014         return err;
3015 }
3016
3017 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3018                      int plen, int scope)
3019 {
3020         struct inet6_ifaddr *ifp;
3021
3022         ifp = ipv6_add_addr(idev, addr, NULL, plen,
3023                             scope, IFA_F_PERMANENT,
3024                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
3025                             true, NULL);
3026         if (!IS_ERR(ifp)) {
3027                 spin_lock_bh(&ifp->lock);
3028                 ifp->flags &= ~IFA_F_TENTATIVE;
3029                 spin_unlock_bh(&ifp->lock);
3030                 rt_genid_bump_ipv6(dev_net(idev->dev));
3031                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3032                 in6_ifa_put(ifp);
3033         }
3034 }
3035
3036 #if IS_ENABLED(CONFIG_IPV6_SIT)
3037 static void sit_add_v4_addrs(struct inet6_dev *idev)
3038 {
3039         struct in6_addr addr;
3040         struct net_device *dev;
3041         struct net *net = dev_net(idev->dev);
3042         int scope, plen;
3043         u32 pflags = 0;
3044
3045         ASSERT_RTNL();
3046
3047         memset(&addr, 0, sizeof(struct in6_addr));
3048         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3049
3050         if (idev->dev->flags&IFF_POINTOPOINT) {
3051                 addr.s6_addr32[0] = htonl(0xfe800000);
3052                 scope = IFA_LINK;
3053                 plen = 64;
3054         } else {
3055                 scope = IPV6_ADDR_COMPATv4;
3056                 plen = 96;
3057                 pflags |= RTF_NONEXTHOP;
3058         }
3059
3060         if (addr.s6_addr32[3]) {
3061                 add_addr(idev, &addr, plen, scope);
3062                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
3063                 return;
3064         }
3065
3066         for_each_netdev(net, dev) {
3067                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3068                 if (in_dev && (dev->flags & IFF_UP)) {
3069                         struct in_ifaddr *ifa;
3070
3071                         int flag = scope;
3072
3073                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3074
3075                                 addr.s6_addr32[3] = ifa->ifa_local;
3076
3077                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3078                                         continue;
3079                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3080                                         if (idev->dev->flags&IFF_POINTOPOINT)
3081                                                 continue;
3082                                         flag |= IFA_HOST;
3083                                 }
3084
3085                                 add_addr(idev, &addr, plen, flag);
3086                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3087                                                       pflags);
3088                         }
3089                 }
3090         }
3091 }
3092 #endif
3093
3094 static void init_loopback(struct net_device *dev)
3095 {
3096         struct inet6_dev  *idev;
3097
3098         /* ::1 */
3099
3100         ASSERT_RTNL();
3101
3102         idev = ipv6_find_idev(dev);
3103         if (!idev) {
3104                 pr_debug("%s: add_dev failed\n", __func__);
3105                 return;
3106         }
3107
3108         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3109 }
3110
3111 void addrconf_add_linklocal(struct inet6_dev *idev,
3112                             const struct in6_addr *addr, u32 flags)
3113 {
3114         struct inet6_ifaddr *ifp;
3115         u32 addr_flags = flags | IFA_F_PERMANENT;
3116
3117 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3118         if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3119              idev->cnf.optimistic_dad) &&
3120             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3121                 addr_flags |= IFA_F_OPTIMISTIC;
3122 #endif
3123
3124         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3125                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
3126         if (!IS_ERR(ifp)) {
3127                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3128                 addrconf_dad_start(ifp);
3129                 in6_ifa_put(ifp);
3130         }
3131 }
3132 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3133
3134 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3135 {
3136         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3137                 return true;
3138
3139         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3140             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3141                 return true;
3142
3143         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3144             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3145                 return true;
3146
3147         return false;
3148 }
3149
3150 static int ipv6_generate_stable_address(struct in6_addr *address,
3151                                         u8 dad_count,
3152                                         const struct inet6_dev *idev)
3153 {
3154         static DEFINE_SPINLOCK(lock);
3155         static __u32 digest[SHA_DIGEST_WORDS];
3156         static __u32 workspace[SHA_WORKSPACE_WORDS];
3157
3158         static union {
3159                 char __data[SHA_MESSAGE_BYTES];
3160                 struct {
3161                         struct in6_addr secret;
3162                         __be32 prefix[2];
3163                         unsigned char hwaddr[MAX_ADDR_LEN];
3164                         u8 dad_count;
3165                 } __packed;
3166         } data;
3167
3168         struct in6_addr secret;
3169         struct in6_addr temp;
3170         struct net *net = dev_net(idev->dev);
3171
3172         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3173
3174         if (idev->cnf.stable_secret.initialized)
3175                 secret = idev->cnf.stable_secret.secret;
3176         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3177                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3178         else
3179                 return -1;
3180
3181 retry:
3182         spin_lock_bh(&lock);
3183
3184         sha_init(digest);
3185         memset(&data, 0, sizeof(data));
3186         memset(workspace, 0, sizeof(workspace));
3187         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3188         data.prefix[0] = address->s6_addr32[0];
3189         data.prefix[1] = address->s6_addr32[1];
3190         data.secret = secret;
3191         data.dad_count = dad_count;
3192
3193         sha_transform(digest, data.__data, workspace);
3194
3195         temp = *address;
3196         temp.s6_addr32[2] = (__force __be32)digest[0];
3197         temp.s6_addr32[3] = (__force __be32)digest[1];
3198
3199         spin_unlock_bh(&lock);
3200
3201         if (ipv6_reserved_interfaceid(temp)) {
3202                 dad_count++;
3203                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3204                         return -1;
3205                 goto retry;
3206         }
3207
3208         *address = temp;
3209         return 0;
3210 }
3211
3212 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3213 {
3214         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3215
3216         if (s->initialized)
3217                 return;
3218         s = &idev->cnf.stable_secret;
3219         get_random_bytes(&s->secret, sizeof(s->secret));
3220         s->initialized = true;
3221 }
3222
3223 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3224 {
3225         struct in6_addr addr;
3226
3227         /* no link local addresses on L3 master devices */
3228         if (netif_is_l3_master(idev->dev))
3229                 return;
3230
3231         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3232
3233         switch (idev->cnf.addr_gen_mode) {
3234         case IN6_ADDR_GEN_MODE_RANDOM:
3235                 ipv6_gen_mode_random_init(idev);
3236                 /* fallthrough */
3237         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3238                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3239                         addrconf_add_linklocal(idev, &addr,
3240                                                IFA_F_STABLE_PRIVACY);
3241                 else if (prefix_route)
3242                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3243                 break;
3244         case IN6_ADDR_GEN_MODE_EUI64:
3245                 /* addrconf_add_linklocal also adds a prefix_route and we
3246                  * only need to care about prefix routes if ipv6_generate_eui64
3247                  * couldn't generate one.
3248                  */
3249                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3250                         addrconf_add_linklocal(idev, &addr, 0);
3251                 else if (prefix_route)
3252                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3253                 break;
3254         case IN6_ADDR_GEN_MODE_NONE:
3255         default:
3256                 /* will not add any link local address */
3257                 break;
3258         }
3259 }
3260
3261 static void addrconf_dev_config(struct net_device *dev)
3262 {
3263         struct inet6_dev *idev;
3264
3265         ASSERT_RTNL();
3266
3267         if ((dev->type != ARPHRD_ETHER) &&
3268             (dev->type != ARPHRD_FDDI) &&
3269             (dev->type != ARPHRD_ARCNET) &&
3270             (dev->type != ARPHRD_INFINIBAND) &&
3271             (dev->type != ARPHRD_IEEE1394) &&
3272             (dev->type != ARPHRD_TUNNEL6) &&
3273             (dev->type != ARPHRD_6LOWPAN) &&
3274             (dev->type != ARPHRD_IP6GRE) &&
3275             (dev->type != ARPHRD_IPGRE) &&
3276             (dev->type != ARPHRD_TUNNEL) &&
3277             (dev->type != ARPHRD_NONE)) {
3278                 /* Alas, we support only Ethernet autoconfiguration. */
3279                 return;
3280         }
3281
3282         idev = addrconf_add_dev(dev);
3283         if (IS_ERR(idev))
3284                 return;
3285
3286         /* this device type has no EUI support */
3287         if (dev->type == ARPHRD_NONE &&
3288             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3289                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3290
3291         addrconf_addr_gen(idev, false);
3292 }
3293
3294 #if IS_ENABLED(CONFIG_IPV6_SIT)
3295 static void addrconf_sit_config(struct net_device *dev)
3296 {
3297         struct inet6_dev *idev;
3298
3299         ASSERT_RTNL();
3300
3301         /*
3302          * Configure the tunnel with one of our IPv4
3303          * addresses... we should configure all of
3304          * our v4 addrs in the tunnel
3305          */
3306
3307         idev = ipv6_find_idev(dev);
3308         if (!idev) {
3309                 pr_debug("%s: add_dev failed\n", __func__);
3310                 return;
3311         }
3312
3313         if (dev->priv_flags & IFF_ISATAP) {
3314                 addrconf_addr_gen(idev, false);
3315                 return;
3316         }
3317
3318         sit_add_v4_addrs(idev);
3319
3320         if (dev->flags&IFF_POINTOPOINT)
3321                 addrconf_add_mroute(dev);
3322 }
3323 #endif
3324
3325 #if IS_ENABLED(CONFIG_NET_IPGRE)
3326 static void addrconf_gre_config(struct net_device *dev)
3327 {
3328         struct inet6_dev *idev;
3329
3330         ASSERT_RTNL();
3331
3332         idev = ipv6_find_idev(dev);
3333         if (!idev) {
3334                 pr_debug("%s: add_dev failed\n", __func__);
3335                 return;
3336         }
3337
3338         addrconf_addr_gen(idev, true);
3339         if (dev->flags & IFF_POINTOPOINT)
3340                 addrconf_add_mroute(dev);
3341 }
3342 #endif
3343
3344 static int fixup_permanent_addr(struct inet6_dev *idev,
3345                                 struct inet6_ifaddr *ifp)
3346 {
3347         /* !rt6i_node means the host route was removed from the
3348          * FIB, for example, if 'lo' device is taken down. In that
3349          * case regenerate the host route.
3350          */
3351         if (!ifp->rt || !ifp->rt->rt6i_node) {
3352                 struct rt6_info *rt, *prev;
3353
3354                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3355                 if (IS_ERR(rt))
3356                         return PTR_ERR(rt);
3357
3358                 /* ifp->rt can be accessed outside of rtnl */
3359                 spin_lock(&ifp->lock);
3360                 prev = ifp->rt;
3361                 ifp->rt = rt;
3362                 spin_unlock(&ifp->lock);
3363
3364                 ip6_rt_put(prev);
3365         }
3366
3367         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3368                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3369                                       idev->dev, 0, 0);
3370         }
3371
3372         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3373                 addrconf_dad_start(ifp);
3374
3375         return 0;
3376 }
3377
3378 static void addrconf_permanent_addr(struct net_device *dev)
3379 {
3380         struct inet6_ifaddr *ifp, *tmp;
3381         struct inet6_dev *idev;
3382
3383         idev = __in6_dev_get(dev);
3384         if (!idev)
3385                 return;
3386
3387         write_lock_bh(&idev->lock);
3388
3389         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3390                 if ((ifp->flags & IFA_F_PERMANENT) &&
3391                     fixup_permanent_addr(idev, ifp) < 0) {
3392                         write_unlock_bh(&idev->lock);
3393                         in6_ifa_hold(ifp);
3394                         ipv6_del_addr(ifp);
3395                         write_lock_bh(&idev->lock);
3396
3397                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3398                                              idev->dev->name, &ifp->addr);
3399                 }
3400         }
3401
3402         write_unlock_bh(&idev->lock);
3403 }
3404
3405 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3406                            void *ptr)
3407 {
3408         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3409         struct netdev_notifier_changeupper_info *info;
3410         struct inet6_dev *idev = __in6_dev_get(dev);
3411         struct net *net = dev_net(dev);
3412         int run_pending = 0;
3413         int err;
3414
3415         switch (event) {
3416         case NETDEV_REGISTER:
3417                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3418                         idev = ipv6_add_dev(dev);
3419                         if (IS_ERR(idev))
3420                                 return notifier_from_errno(PTR_ERR(idev));
3421                 }
3422                 break;
3423
3424         case NETDEV_CHANGEMTU:
3425                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3426                 if (dev->mtu < IPV6_MIN_MTU) {
3427                         addrconf_ifdown(dev, dev != net->loopback_dev);
3428                         break;
3429                 }
3430
3431                 if (idev) {
3432                         rt6_mtu_change(dev, dev->mtu);
3433                         idev->cnf.mtu6 = dev->mtu;
3434                         break;
3435                 }
3436
3437                 /* allocate new idev */
3438                 idev = ipv6_add_dev(dev);
3439                 if (IS_ERR(idev))
3440                         break;
3441
3442                 /* device is still not ready */
3443                 if (!(idev->if_flags & IF_READY))
3444                         break;
3445
3446                 run_pending = 1;
3447
3448                 /* fall through */
3449
3450         case NETDEV_UP:
3451         case NETDEV_CHANGE:
3452                 if (dev->flags & IFF_SLAVE)
3453                         break;
3454
3455                 if (idev && idev->cnf.disable_ipv6)
3456                         break;
3457
3458                 if (event == NETDEV_UP) {
3459                         /* restore routes for permanent addresses */
3460                         addrconf_permanent_addr(dev);
3461
3462                         if (!addrconf_link_ready(dev)) {
3463                                 /* device is not ready yet. */
3464                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3465                                         dev->name);
3466                                 break;
3467                         }
3468
3469                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3470                                 idev = ipv6_add_dev(dev);
3471
3472                         if (!IS_ERR_OR_NULL(idev)) {
3473                                 idev->if_flags |= IF_READY;
3474                                 run_pending = 1;
3475                         }
3476                 } else if (event == NETDEV_CHANGE) {
3477                         if (!addrconf_link_ready(dev)) {
3478                                 /* device is still not ready. */
3479                                 rt6_sync_down_dev(dev, event);
3480                                 break;
3481                         }
3482
3483                         if (idev) {
3484                                 if (idev->if_flags & IF_READY) {
3485                                         /* device is already configured -
3486                                          * but resend MLD reports, we might
3487                                          * have roamed and need to update
3488                                          * multicast snooping switches
3489                                          */
3490                                         ipv6_mc_up(idev);
3491                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
3492                                         break;
3493                                 }
3494                                 idev->if_flags |= IF_READY;
3495                         }
3496
3497                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3498                                 dev->name);
3499
3500                         run_pending = 1;
3501                 }
3502
3503                 switch (dev->type) {
3504 #if IS_ENABLED(CONFIG_IPV6_SIT)
3505                 case ARPHRD_SIT:
3506                         addrconf_sit_config(dev);
3507                         break;
3508 #endif
3509 #if IS_ENABLED(CONFIG_NET_IPGRE)
3510                 case ARPHRD_IPGRE:
3511                         addrconf_gre_config(dev);
3512                         break;
3513 #endif
3514                 case ARPHRD_LOOPBACK:
3515                         init_loopback(dev);
3516                         break;
3517
3518                 default:
3519                         addrconf_dev_config(dev);
3520                         break;
3521                 }
3522
3523                 if (!IS_ERR_OR_NULL(idev)) {
3524                         if (run_pending)
3525                                 addrconf_dad_run(idev);
3526
3527                         /* Device has an address by now */
3528                         rt6_sync_up(dev, RTNH_F_DEAD);
3529
3530                         /*
3531                          * If the MTU changed during the interface down,
3532                          * when the interface up, the changed MTU must be
3533                          * reflected in the idev as well as routers.
3534                          */
3535                         if (idev->cnf.mtu6 != dev->mtu &&
3536                             dev->mtu >= IPV6_MIN_MTU) {
3537                                 rt6_mtu_change(dev, dev->mtu);
3538                                 idev->cnf.mtu6 = dev->mtu;
3539                         }
3540                         idev->tstamp = jiffies;
3541                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3542
3543                         /*
3544                          * If the changed mtu during down is lower than
3545                          * IPV6_MIN_MTU stop IPv6 on this interface.
3546                          */
3547                         if (dev->mtu < IPV6_MIN_MTU)
3548                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3549                 }
3550                 break;
3551
3552         case NETDEV_DOWN:
3553         case NETDEV_UNREGISTER:
3554                 /*
3555                  *      Remove all addresses from this interface.
3556                  */
3557                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3558                 break;
3559
3560         case NETDEV_CHANGENAME:
3561                 if (idev) {
3562                         snmp6_unregister_dev(idev);
3563                         addrconf_sysctl_unregister(idev);
3564                         err = addrconf_sysctl_register(idev);
3565                         if (err)
3566                                 return notifier_from_errno(err);
3567                         err = snmp6_register_dev(idev);
3568                         if (err) {
3569                                 addrconf_sysctl_unregister(idev);
3570                                 return notifier_from_errno(err);
3571                         }
3572                 }
3573                 break;
3574
3575         case NETDEV_PRE_TYPE_CHANGE:
3576         case NETDEV_POST_TYPE_CHANGE:
3577                 if (idev)
3578                         addrconf_type_change(dev, event);
3579                 break;
3580
3581         case NETDEV_CHANGEUPPER:
3582                 info = ptr;
3583
3584                 /* flush all routes if dev is linked to or unlinked from
3585                  * an L3 master device (e.g., VRF)
3586                  */
3587                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3588                         addrconf_ifdown(dev, 0);
3589         }
3590
3591         return NOTIFY_OK;
3592 }
3593
3594 /*
3595  *      addrconf module should be notified of a device going up
3596  */
3597 static struct notifier_block ipv6_dev_notf = {
3598         .notifier_call = addrconf_notify,
3599         .priority = ADDRCONF_NOTIFY_PRIORITY,
3600 };
3601
3602 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3603 {
3604         struct inet6_dev *idev;
3605         ASSERT_RTNL();
3606
3607         idev = __in6_dev_get(dev);
3608
3609         if (event == NETDEV_POST_TYPE_CHANGE)
3610                 ipv6_mc_remap(idev);
3611         else if (event == NETDEV_PRE_TYPE_CHANGE)
3612                 ipv6_mc_unmap(idev);
3613 }
3614
3615 static bool addr_is_local(const struct in6_addr *addr)
3616 {
3617         return ipv6_addr_type(addr) &
3618                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3619 }
3620
3621 static int addrconf_ifdown(struct net_device *dev, int how)
3622 {
3623         unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3624         struct net *net = dev_net(dev);
3625         struct inet6_dev *idev;
3626         struct inet6_ifaddr *ifa, *tmp;
3627         int _keep_addr;
3628         bool keep_addr;
3629         int state, i;
3630
3631         ASSERT_RTNL();
3632
3633         rt6_disable_ip(dev, event);
3634
3635         idev = __in6_dev_get(dev);
3636         if (!idev)
3637                 return -ENODEV;
3638
3639         /*
3640          * Step 1: remove reference to ipv6 device from parent device.
3641          *         Do not dev_put!
3642          */
3643         if (how) {
3644                 idev->dead = 1;
3645
3646                 /* protected by rtnl_lock */
3647                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3648
3649                 /* Step 1.5: remove snmp6 entry */
3650                 snmp6_unregister_dev(idev);
3651
3652         }
3653
3654         /* aggregate the system setting and interface setting */
3655         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3656         if (!_keep_addr)
3657                 _keep_addr = idev->cnf.keep_addr_on_down;
3658
3659         /* combine the user config with event to determine if permanent
3660          * addresses are to be removed from address hash table
3661          */
3662         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3663
3664         /* Step 2: clear hash table */
3665         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3666                 struct hlist_head *h = &inet6_addr_lst[i];
3667
3668                 spin_lock_bh(&addrconf_hash_lock);
3669 restart:
3670                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3671                         if (ifa->idev == idev) {
3672                                 addrconf_del_dad_work(ifa);
3673                                 /* combined flag + permanent flag decide if
3674                                  * address is retained on a down event
3675                                  */
3676                                 if (!keep_addr ||
3677                                     !(ifa->flags & IFA_F_PERMANENT) ||
3678                                     addr_is_local(&ifa->addr)) {
3679                                         hlist_del_init_rcu(&ifa->addr_lst);
3680                                         goto restart;
3681                                 }
3682                         }
3683                 }
3684                 spin_unlock_bh(&addrconf_hash_lock);
3685         }
3686
3687         write_lock_bh(&idev->lock);
3688
3689         addrconf_del_rs_timer(idev);
3690
3691         /* Step 2: clear flags for stateless addrconf */
3692         if (!how)
3693                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3694
3695         /* Step 3: clear tempaddr list */
3696         while (!list_empty(&idev->tempaddr_list)) {
3697                 ifa = list_first_entry(&idev->tempaddr_list,
3698                                        struct inet6_ifaddr, tmp_list);
3699                 list_del(&ifa->tmp_list);
3700                 write_unlock_bh(&idev->lock);
3701                 spin_lock_bh(&ifa->lock);
3702
3703                 if (ifa->ifpub) {
3704                         in6_ifa_put(ifa->ifpub);
3705                         ifa->ifpub = NULL;
3706                 }
3707                 spin_unlock_bh(&ifa->lock);
3708                 in6_ifa_put(ifa);
3709                 write_lock_bh(&idev->lock);
3710         }
3711
3712         /* re-combine the user config with event to determine if permanent
3713          * addresses are to be removed from the interface list
3714          */
3715         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3716
3717         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3718                 struct rt6_info *rt = NULL;
3719                 bool keep;
3720
3721                 addrconf_del_dad_work(ifa);
3722
3723                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3724                         !addr_is_local(&ifa->addr);
3725
3726                 write_unlock_bh(&idev->lock);
3727                 spin_lock_bh(&ifa->lock);
3728
3729                 if (keep) {
3730                         /* set state to skip the notifier below */
3731                         state = INET6_IFADDR_STATE_DEAD;
3732                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3733                         if (!(ifa->flags & IFA_F_NODAD))
3734                                 ifa->flags |= IFA_F_TENTATIVE;
3735
3736                         rt = ifa->rt;
3737                         ifa->rt = NULL;
3738                 } else {
3739                         state = ifa->state;
3740                         ifa->state = INET6_IFADDR_STATE_DEAD;
3741                 }
3742
3743                 spin_unlock_bh(&ifa->lock);
3744
3745                 if (rt)
3746                         ip6_del_rt(rt);
3747
3748                 if (state != INET6_IFADDR_STATE_DEAD) {
3749                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3750                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3751                 } else {
3752                         if (idev->cnf.forwarding)
3753                                 addrconf_leave_anycast(ifa);
3754                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3755                 }
3756
3757                 write_lock_bh(&idev->lock);
3758                 if (!keep) {
3759                         list_del_rcu(&ifa->if_list);
3760                         in6_ifa_put(ifa);
3761                 }
3762         }
3763
3764         write_unlock_bh(&idev->lock);
3765
3766         /* Step 5: Discard anycast and multicast list */
3767         if (how) {
3768                 ipv6_ac_destroy_dev(idev);
3769                 ipv6_mc_destroy_dev(idev);
3770         } else {
3771                 ipv6_mc_down(idev);
3772         }
3773
3774         idev->tstamp = jiffies;
3775
3776         /* Last: Shot the device (if unregistered) */
3777         if (how) {
3778                 addrconf_sysctl_unregister(idev);
3779                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3780                 neigh_ifdown(&nd_tbl, dev);
3781                 in6_dev_put(idev);
3782         }
3783         return 0;
3784 }
3785
3786 static void addrconf_rs_timer(struct timer_list *t)
3787 {
3788         struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3789         struct net_device *dev = idev->dev;
3790         struct in6_addr lladdr;
3791
3792         write_lock(&idev->lock);
3793         if (idev->dead || !(idev->if_flags & IF_READY))
3794                 goto out;
3795
3796         if (!ipv6_accept_ra(idev))
3797                 goto out;
3798
3799         /* Announcement received after solicitation was sent */
3800         if (idev->if_flags & IF_RA_RCVD)
3801                 goto out;
3802
3803         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3804                 write_unlock(&idev->lock);
3805                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3806                         ndisc_send_rs(dev, &lladdr,
3807                                       &in6addr_linklocal_allrouters);
3808                 else
3809                         goto put;
3810
3811                 write_lock(&idev->lock);
3812                 idev->rs_interval = rfc3315_s14_backoff_update(
3813                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3814                 /* The wait after the last probe can be shorter */
3815                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3816                                              idev->cnf.rtr_solicits) ?
3817                                       idev->cnf.rtr_solicit_delay :
3818                                       idev->rs_interval);
3819         } else {
3820                 /*
3821                  * Note: we do not support deprecated "all on-link"
3822                  * assumption any longer.
3823                  */
3824                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3825         }
3826
3827 out:
3828         write_unlock(&idev->lock);
3829 put:
3830         in6_dev_put(idev);
3831 }
3832
3833 /*
3834  *      Duplicate Address Detection
3835  */
3836 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3837 {
3838         unsigned long rand_num;
3839         struct inet6_dev *idev = ifp->idev;
3840         u64 nonce;
3841
3842         if (ifp->flags & IFA_F_OPTIMISTIC)
3843                 rand_num = 0;
3844         else
3845                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3846
3847         nonce = 0;
3848         if (idev->cnf.enhanced_dad ||
3849             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3850                 do
3851                         get_random_bytes(&nonce, 6);
3852                 while (nonce == 0);
3853         }
3854         ifp->dad_nonce = nonce;
3855         ifp->dad_probes = idev->cnf.dad_transmits;
3856         addrconf_mod_dad_work(ifp, rand_num);
3857 }
3858
3859 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3860 {
3861         struct inet6_dev *idev = ifp->idev;
3862         struct net_device *dev = idev->dev;
3863         bool bump_id, notify = false;
3864
3865         addrconf_join_solict(dev, &ifp->addr);
3866
3867         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3868
3869         read_lock_bh(&idev->lock);
3870         spin_lock(&ifp->lock);
3871         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3872                 goto out;
3873
3874         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3875             (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3876              idev->cnf.accept_dad < 1) ||
3877             !(ifp->flags&IFA_F_TENTATIVE) ||
3878             ifp->flags & IFA_F_NODAD) {
3879                 bool send_na = false;
3880
3881                 if (ifp->flags & IFA_F_TENTATIVE &&
3882                     !(ifp->flags & IFA_F_OPTIMISTIC))
3883                         send_na = true;
3884                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3885                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3886                 spin_unlock(&ifp->lock);
3887                 read_unlock_bh(&idev->lock);
3888
3889                 addrconf_dad_completed(ifp, bump_id, send_na);
3890                 return;
3891         }
3892
3893         if (!(idev->if_flags & IF_READY)) {
3894                 spin_unlock(&ifp->lock);
3895                 read_unlock_bh(&idev->lock);
3896                 /*
3897                  * If the device is not ready:
3898                  * - keep it tentative if it is a permanent address.
3899                  * - otherwise, kill it.
3900                  */
3901                 in6_ifa_hold(ifp);
3902                 addrconf_dad_stop(ifp, 0);
3903                 return;
3904         }
3905
3906         /*
3907          * Optimistic nodes can start receiving
3908          * Frames right away
3909          */
3910         if (ifp->flags & IFA_F_OPTIMISTIC) {
3911                 ip6_ins_rt(ifp->rt);
3912                 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
3913                         /* Because optimistic nodes can use this address,
3914                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3915                          */
3916                         notify = true;
3917                 }
3918         }
3919
3920         addrconf_dad_kick(ifp);
3921 out:
3922         spin_unlock(&ifp->lock);
3923         read_unlock_bh(&idev->lock);
3924         if (notify)
3925                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3926 }
3927
3928 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3929 {
3930         bool begin_dad = false;
3931
3932         spin_lock_bh(&ifp->lock);
3933         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3934                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3935                 begin_dad = true;
3936         }
3937         spin_unlock_bh(&ifp->lock);
3938
3939         if (begin_dad)
3940                 addrconf_mod_dad_work(ifp, 0);
3941 }
3942
3943 static void addrconf_dad_work(struct work_struct *w)
3944 {
3945         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3946                                                 struct inet6_ifaddr,
3947                                                 dad_work);
3948         struct inet6_dev *idev = ifp->idev;
3949         bool bump_id, disable_ipv6 = false;
3950         struct in6_addr mcaddr;
3951
3952         enum {
3953                 DAD_PROCESS,
3954                 DAD_BEGIN,
3955                 DAD_ABORT,
3956         } action = DAD_PROCESS;
3957
3958         rtnl_lock();
3959
3960         spin_lock_bh(&ifp->lock);
3961         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3962                 action = DAD_BEGIN;
3963                 ifp->state = INET6_IFADDR_STATE_DAD;
3964         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3965                 action = DAD_ABORT;
3966                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3967
3968                 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3969                      idev->cnf.accept_dad > 1) &&
3970                     !idev->cnf.disable_ipv6 &&
3971                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3972                         struct in6_addr addr;
3973
3974                         addr.s6_addr32[0] = htonl(0xfe800000);
3975                         addr.s6_addr32[1] = 0;
3976
3977                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3978                             ipv6_addr_equal(&ifp->addr, &addr)) {
3979                                 /* DAD failed for link-local based on MAC */
3980                                 idev->cnf.disable_ipv6 = 1;
3981
3982                                 pr_info("%s: IPv6 being disabled!\n",
3983                                         ifp->idev->dev->name);
3984                                 disable_ipv6 = true;
3985                         }
3986                 }
3987         }
3988         spin_unlock_bh(&ifp->lock);
3989
3990         if (action == DAD_BEGIN) {
3991                 addrconf_dad_begin(ifp);
3992                 goto out;
3993         } else if (action == DAD_ABORT) {
3994                 in6_ifa_hold(ifp);
3995                 addrconf_dad_stop(ifp, 1);
3996                 if (disable_ipv6)
3997                         addrconf_ifdown(idev->dev, 0);
3998                 goto out;
3999         }
4000
4001         if (!ifp->dad_probes && addrconf_dad_end(ifp))
4002                 goto out;
4003
4004         write_lock_bh(&idev->lock);
4005         if (idev->dead || !(idev->if_flags & IF_READY)) {
4006                 write_unlock_bh(&idev->lock);
4007                 goto out;
4008         }
4009
4010         spin_lock(&ifp->lock);
4011         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4012                 spin_unlock(&ifp->lock);
4013                 write_unlock_bh(&idev->lock);
4014                 goto out;
4015         }
4016
4017         if (ifp->dad_probes == 0) {
4018                 bool send_na = false;
4019
4020                 /*
4021                  * DAD was successful
4022                  */
4023
4024                 if (ifp->flags & IFA_F_TENTATIVE &&
4025                     !(ifp->flags & IFA_F_OPTIMISTIC))
4026                         send_na = true;
4027                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4028                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4029                 spin_unlock(&ifp->lock);
4030                 write_unlock_bh(&idev->lock);
4031
4032                 addrconf_dad_completed(ifp, bump_id, send_na);
4033
4034                 goto out;
4035         }
4036
4037         ifp->dad_probes--;
4038         addrconf_mod_dad_work(ifp,
4039                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4040         spin_unlock(&ifp->lock);
4041         write_unlock_bh(&idev->lock);
4042
4043         /* send a neighbour solicitation for our addr */
4044         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4045         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4046                       ifp->dad_nonce);
4047 out:
4048         in6_ifa_put(ifp);
4049         rtnl_unlock();
4050 }
4051
4052 /* ifp->idev must be at least read locked */
4053 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4054 {
4055         struct inet6_ifaddr *ifpiter;
4056         struct inet6_dev *idev = ifp->idev;
4057
4058         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4059                 if (ifpiter->scope > IFA_LINK)
4060                         break;
4061                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4062                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4063                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4064                     IFA_F_PERMANENT)
4065                         return false;
4066         }
4067         return true;
4068 }
4069
4070 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4071                                    bool send_na)
4072 {
4073         struct net_device *dev = ifp->idev->dev;
4074         struct in6_addr lladdr;
4075         bool send_rs, send_mld;
4076
4077         addrconf_del_dad_work(ifp);
4078
4079         /*
4080          *      Configure the address for reception. Now it is valid.
4081          */
4082
4083         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4084
4085         /* If added prefix is link local and we are prepared to process
4086            router advertisements, start sending router solicitations.
4087          */
4088
4089         read_lock_bh(&ifp->idev->lock);
4090         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4091         send_rs = send_mld &&
4092                   ipv6_accept_ra(ifp->idev) &&
4093                   ifp->idev->cnf.rtr_solicits != 0 &&
4094                   (dev->flags&IFF_LOOPBACK) == 0;
4095         read_unlock_bh(&ifp->idev->lock);
4096
4097         /* While dad is in progress mld report's source address is in6_addrany.
4098          * Resend with proper ll now.
4099          */
4100         if (send_mld)
4101                 ipv6_mc_dad_complete(ifp->idev);
4102
4103         /* send unsolicited NA if enabled */
4104         if (send_na &&
4105             (ifp->idev->cnf.ndisc_notify ||
4106              dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4107                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4108                               /*router=*/ !!ifp->idev->cnf.forwarding,
4109                               /*solicited=*/ false, /*override=*/ true,
4110                               /*inc_opt=*/ true);
4111         }
4112
4113         if (send_rs) {
4114                 /*
4115                  *      If a host as already performed a random delay
4116                  *      [...] as part of DAD [...] there is no need
4117                  *      to delay again before sending the first RS
4118                  */
4119                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4120                         return;
4121                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4122
4123                 write_lock_bh(&ifp->idev->lock);
4124                 spin_lock(&ifp->lock);
4125                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4126                         ifp->idev->cnf.rtr_solicit_interval);
4127                 ifp->idev->rs_probes = 1;
4128                 ifp->idev->if_flags |= IF_RS_SENT;
4129                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4130                 spin_unlock(&ifp->lock);
4131                 write_unlock_bh(&ifp->idev->lock);
4132         }
4133
4134         if (bump_id)
4135                 rt_genid_bump_ipv6(dev_net(dev));
4136
4137         /* Make sure that a new temporary address will be created
4138          * before this temporary address becomes deprecated.
4139          */
4140         if (ifp->flags & IFA_F_TEMPORARY)
4141                 addrconf_verify_rtnl();
4142 }
4143
4144 static void addrconf_dad_run(struct inet6_dev *idev)
4145 {
4146         struct inet6_ifaddr *ifp;
4147
4148         read_lock_bh(&idev->lock);
4149         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4150                 spin_lock(&ifp->lock);
4151                 if (ifp->flags & IFA_F_TENTATIVE &&
4152                     ifp->state == INET6_IFADDR_STATE_DAD)
4153                         addrconf_dad_kick(ifp);
4154                 spin_unlock(&ifp->lock);
4155         }
4156         read_unlock_bh(&idev->lock);
4157 }
4158
4159 #ifdef CONFIG_PROC_FS
4160 struct if6_iter_state {
4161         struct seq_net_private p;
4162         int bucket;
4163         int offset;
4164 };
4165
4166 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4167 {
4168         struct if6_iter_state *state = seq->private;
4169         struct net *net = seq_file_net(seq);
4170         struct inet6_ifaddr *ifa = NULL;
4171         int p = 0;
4172
4173         /* initial bucket if pos is 0 */
4174         if (pos == 0) {
4175                 state->bucket = 0;
4176                 state->offset = 0;
4177         }
4178
4179         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4180                 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4181                                          addr_lst) {
4182                         if (!net_eq(dev_net(ifa->idev->dev), net))
4183                                 continue;
4184                         /* sync with offset */
4185                         if (p < state->offset) {
4186                                 p++;
4187                                 continue;
4188                         }
4189                         state->offset++;
4190                         return ifa;
4191                 }
4192
4193                 /* prepare for next bucket */
4194                 state->offset = 0;
4195                 p = 0;
4196         }
4197         return NULL;
4198 }
4199
4200 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4201                                          struct inet6_ifaddr *ifa)
4202 {
4203         struct if6_iter_state *state = seq->private;
4204         struct net *net = seq_file_net(seq);
4205
4206         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4207                 if (!net_eq(dev_net(ifa->idev->dev), net))
4208                         continue;
4209                 state->offset++;
4210                 return ifa;
4211         }
4212
4213         while (++state->bucket < IN6_ADDR_HSIZE) {
4214                 state->offset = 0;
4215                 hlist_for_each_entry_rcu(ifa,
4216                                      &inet6_addr_lst[state->bucket], addr_lst) {
4217                         if (!net_eq(dev_net(ifa->idev->dev), net))
4218                                 continue;
4219                         state->offset++;
4220                         return ifa;
4221                 }
4222         }
4223
4224         return NULL;
4225 }
4226
4227 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4228         __acquires(rcu)
4229 {
4230         rcu_read_lock();
4231         return if6_get_first(seq, *pos);
4232 }
4233
4234 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4235 {
4236         struct inet6_ifaddr *ifa;
4237
4238         ifa = if6_get_next(seq, v);
4239         ++*pos;
4240         return ifa;
4241 }
4242
4243 static void if6_seq_stop(struct seq_file *seq, void *v)
4244         __releases(rcu)
4245 {
4246         rcu_read_unlock();
4247 }
4248
4249 static int if6_seq_show(struct seq_file *seq, void *v)
4250 {
4251         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4252         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4253                    &ifp->addr,
4254                    ifp->idev->dev->ifindex,
4255                    ifp->prefix_len,
4256                    ifp->scope,
4257                    (u8) ifp->flags,
4258                    ifp->idev->dev->name);
4259         return 0;
4260 }
4261
4262 static const struct seq_operations if6_seq_ops = {
4263         .start  = if6_seq_start,
4264         .next   = if6_seq_next,
4265         .show   = if6_seq_show,
4266         .stop   = if6_seq_stop,
4267 };
4268
4269 static int if6_seq_open(struct inode *inode, struct file *file)
4270 {
4271         return seq_open_net(inode, file, &if6_seq_ops,
4272                             sizeof(struct if6_iter_state));
4273 }
4274
4275 static const struct file_operations if6_fops = {
4276         .open           = if6_seq_open,
4277         .read           = seq_read,
4278         .llseek         = seq_lseek,
4279         .release        = seq_release_net,
4280 };
4281
4282 static int __net_init if6_proc_net_init(struct net *net)
4283 {
4284         if (!proc_create("if_inet6", 0444, net->proc_net, &if6_fops))
4285                 return -ENOMEM;
4286         return 0;
4287 }
4288
4289 static void __net_exit if6_proc_net_exit(struct net *net)
4290 {
4291         remove_proc_entry("if_inet6", net->proc_net);
4292 }
4293
4294 static struct pernet_operations if6_proc_net_ops = {
4295         .init = if6_proc_net_init,
4296         .exit = if6_proc_net_exit,
4297         .async = true,
4298 };
4299
4300 int __init if6_proc_init(void)
4301 {
4302         return register_pernet_subsys(&if6_proc_net_ops);
4303 }
4304
4305 void if6_proc_exit(void)
4306 {
4307         unregister_pernet_subsys(&if6_proc_net_ops);
4308 }
4309 #endif  /* CONFIG_PROC_FS */
4310
4311 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4312 /* Check if address is a home address configured on any interface. */
4313 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4314 {
4315         unsigned int hash = inet6_addr_hash(net, addr);
4316         struct inet6_ifaddr *ifp = NULL;
4317         int ret = 0;
4318
4319         rcu_read_lock();
4320         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4321                 if (!net_eq(dev_net(ifp->idev->dev), net))
4322                         continue;
4323                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4324                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4325                         ret = 1;
4326                         break;
4327                 }
4328         }
4329         rcu_read_unlock();
4330         return ret;
4331 }
4332 #endif
4333
4334 /*
4335  *      Periodic address status verification
4336  */
4337
4338 static void addrconf_verify_rtnl(void)
4339 {
4340         unsigned long now, next, next_sec, next_sched;
4341         struct inet6_ifaddr *ifp;
4342         int i;
4343
4344         ASSERT_RTNL();
4345
4346         rcu_read_lock_bh();
4347         now = jiffies;
4348         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4349
4350         cancel_delayed_work(&addr_chk_work);
4351
4352         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4353 restart:
4354                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4355                         unsigned long age;
4356
4357                         /* When setting preferred_lft to a value not zero or
4358                          * infinity, while valid_lft is infinity
4359                          * IFA_F_PERMANENT has a non-infinity life time.
4360                          */
4361                         if ((ifp->flags & IFA_F_PERMANENT) &&
4362                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4363                                 continue;
4364
4365                         spin_lock(&ifp->lock);
4366                         /* We try to batch several events at once. */
4367                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4368
4369                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4370                             age >= ifp->valid_lft) {
4371                                 spin_unlock(&ifp->lock);
4372                                 in6_ifa_hold(ifp);
4373                                 ipv6_del_addr(ifp);
4374                                 goto restart;
4375                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4376                                 spin_unlock(&ifp->lock);
4377                                 continue;
4378                         } else if (age >= ifp->prefered_lft) {
4379                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4380                                 int deprecate = 0;
4381
4382                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4383                                         deprecate = 1;
4384                                         ifp->flags |= IFA_F_DEPRECATED;
4385                                 }
4386
4387                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4388                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4389                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4390
4391                                 spin_unlock(&ifp->lock);
4392
4393                                 if (deprecate) {
4394                                         in6_ifa_hold(ifp);
4395
4396                                         ipv6_ifa_notify(0, ifp);
4397                                         in6_ifa_put(ifp);
4398                                         goto restart;
4399                                 }
4400                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4401                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4402                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4403                                         ifp->idev->cnf.dad_transmits *
4404                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4405
4406                                 if (age >= ifp->prefered_lft - regen_advance) {
4407                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4408                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4409                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4410                                         if (!ifp->regen_count && ifpub) {
4411                                                 ifp->regen_count++;
4412                                                 in6_ifa_hold(ifp);
4413                                                 in6_ifa_hold(ifpub);
4414                                                 spin_unlock(&ifp->lock);
4415
4416                                                 spin_lock(&ifpub->lock);
4417                                                 ifpub->regen_count = 0;
4418                                                 spin_unlock(&ifpub->lock);
4419                                                 rcu_read_unlock_bh();
4420                                                 ipv6_create_tempaddr(ifpub, ifp, true);
4421                                                 in6_ifa_put(ifpub);
4422                                                 in6_ifa_put(ifp);
4423                                                 rcu_read_lock_bh();
4424                                                 goto restart;
4425                                         }
4426                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4427                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4428                                 spin_unlock(&ifp->lock);
4429                         } else {
4430                                 /* ifp->prefered_lft <= ifp->valid_lft */
4431                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4432                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4433                                 spin_unlock(&ifp->lock);
4434                         }
4435                 }
4436         }
4437
4438         next_sec = round_jiffies_up(next);
4439         next_sched = next;
4440
4441         /* If rounded timeout is accurate enough, accept it. */
4442         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4443                 next_sched = next_sec;
4444
4445         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4446         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4447                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4448
4449         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4450               now, next, next_sec, next_sched);
4451         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4452         rcu_read_unlock_bh();
4453 }
4454
4455 static void addrconf_verify_work(struct work_struct *w)
4456 {
4457         rtnl_lock();
4458         addrconf_verify_rtnl();
4459         rtnl_unlock();
4460 }
4461
4462 static void addrconf_verify(void)
4463 {
4464         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4465 }
4466
4467 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4468                                      struct in6_addr **peer_pfx)
4469 {
4470         struct in6_addr *pfx = NULL;
4471
4472         *peer_pfx = NULL;
4473
4474         if (addr)
4475                 pfx = nla_data(addr);
4476
4477         if (local) {
4478                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4479                         *peer_pfx = pfx;
4480                 pfx = nla_data(local);
4481         }
4482
4483         return pfx;
4484 }
4485
4486 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4487         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4488         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4489         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4490         [IFA_FLAGS]             = { .len = sizeof(u32) },
4491 };
4492
4493 static int
4494 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4495                   struct netlink_ext_ack *extack)
4496 {
4497         struct net *net = sock_net(skb->sk);
4498         struct ifaddrmsg *ifm;
4499         struct nlattr *tb[IFA_MAX+1];
4500         struct in6_addr *pfx, *peer_pfx;
4501         u32 ifa_flags;
4502         int err;
4503
4504         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4505                           extack);
4506         if (err < 0)
4507                 return err;
4508
4509         ifm = nlmsg_data(nlh);
4510         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4511         if (!pfx)
4512                 return -EINVAL;
4513
4514         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4515
4516         /* We ignore other flags so far. */
4517         ifa_flags &= IFA_F_MANAGETEMPADDR;
4518
4519         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4520                               ifm->ifa_prefixlen);
4521 }
4522
4523 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4524                              u32 prefered_lft, u32 valid_lft)
4525 {
4526         u32 flags;
4527         clock_t expires;
4528         unsigned long timeout;
4529         bool was_managetempaddr;
4530         bool had_prefixroute;
4531
4532         ASSERT_RTNL();
4533
4534         if (!valid_lft || (prefered_lft > valid_lft))
4535                 return -EINVAL;
4536
4537         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4538             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4539                 return -EINVAL;
4540
4541         if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4542                 ifa_flags &= ~IFA_F_OPTIMISTIC;
4543
4544         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4545         if (addrconf_finite_timeout(timeout)) {
4546                 expires = jiffies_to_clock_t(timeout * HZ);
4547                 valid_lft = timeout;
4548                 flags = RTF_EXPIRES;
4549         } else {
4550                 expires = 0;
4551                 flags = 0;
4552                 ifa_flags |= IFA_F_PERMANENT;
4553         }
4554
4555         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4556         if (addrconf_finite_timeout(timeout)) {
4557                 if (timeout == 0)
4558                         ifa_flags |= IFA_F_DEPRECATED;
4559                 prefered_lft = timeout;
4560         }
4561
4562         spin_lock_bh(&ifp->lock);
4563         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4564         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4565                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4566         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4567                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4568                         IFA_F_NOPREFIXROUTE);
4569         ifp->flags |= ifa_flags;
4570         ifp->tstamp = jiffies;
4571         ifp->valid_lft = valid_lft;
4572         ifp->prefered_lft = prefered_lft;
4573
4574         spin_unlock_bh(&ifp->lock);
4575         if (!(ifp->flags&IFA_F_TENTATIVE))
4576                 ipv6_ifa_notify(0, ifp);
4577
4578         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4579                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4580                                       expires, flags);
4581         } else if (had_prefixroute) {
4582                 enum cleanup_prefix_rt_t action;
4583                 unsigned long rt_expires;
4584
4585                 write_lock_bh(&ifp->idev->lock);
4586                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4587                 write_unlock_bh(&ifp->idev->lock);
4588
4589                 if (action != CLEANUP_PREFIX_RT_NOP) {
4590                         cleanup_prefix_route(ifp, rt_expires,
4591                                 action == CLEANUP_PREFIX_RT_DEL);
4592                 }
4593         }
4594
4595         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4596                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4597                         valid_lft = prefered_lft = 0;
4598                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4599                                  !was_managetempaddr, jiffies);
4600         }
4601
4602         addrconf_verify_rtnl();
4603
4604         return 0;
4605 }
4606
4607 static int
4608 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4609                   struct netlink_ext_ack *extack)
4610 {
4611         struct net *net = sock_net(skb->sk);
4612         struct ifaddrmsg *ifm;
4613         struct nlattr *tb[IFA_MAX+1];
4614         struct in6_addr *pfx, *peer_pfx;
4615         struct inet6_ifaddr *ifa;
4616         struct net_device *dev;
4617         struct inet6_dev *idev;
4618         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4619         u32 ifa_flags;
4620         int err;
4621
4622         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4623                           extack);
4624         if (err < 0)
4625                 return err;
4626
4627         ifm = nlmsg_data(nlh);
4628         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4629         if (!pfx)
4630                 return -EINVAL;
4631
4632         if (tb[IFA_CACHEINFO]) {
4633                 struct ifa_cacheinfo *ci;
4634
4635                 ci = nla_data(tb[IFA_CACHEINFO]);
4636                 valid_lft = ci->ifa_valid;
4637                 preferred_lft = ci->ifa_prefered;
4638         } else {
4639                 preferred_lft = INFINITY_LIFE_TIME;
4640                 valid_lft = INFINITY_LIFE_TIME;
4641         }
4642
4643         dev =  __dev_get_by_index(net, ifm->ifa_index);
4644         if (!dev)
4645                 return -ENODEV;
4646
4647         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4648
4649         /* We ignore other flags so far. */
4650         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4651                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4652
4653         idev = ipv6_find_idev(dev);
4654         if (IS_ERR(idev))
4655                 return PTR_ERR(idev);
4656
4657         if (!ipv6_allow_optimistic_dad(net, idev))
4658                 ifa_flags &= ~IFA_F_OPTIMISTIC;
4659
4660         if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) {
4661                 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4662                 return -EINVAL;
4663         }
4664
4665         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4666         if (!ifa) {
4667                 /*
4668                  * It would be best to check for !NLM_F_CREATE here but
4669                  * userspace already relies on not having to provide this.
4670                  */
4671                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4672                                       ifm->ifa_prefixlen, ifa_flags,
4673                                       preferred_lft, valid_lft, extack);
4674         }
4675
4676         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4677             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4678                 err = -EEXIST;
4679         else
4680                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4681
4682         in6_ifa_put(ifa);
4683
4684         return err;
4685 }
4686
4687 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4688                           u8 scope, int ifindex)
4689 {
4690         struct ifaddrmsg *ifm;
4691
4692         ifm = nlmsg_data(nlh);
4693         ifm->ifa_family = AF_INET6;
4694         ifm->ifa_prefixlen = prefixlen;
4695         ifm->ifa_flags = flags;
4696         ifm->ifa_scope = scope;
4697         ifm->ifa_index = ifindex;
4698 }
4699
4700 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4701                          unsigned long tstamp, u32 preferred, u32 valid)
4702 {
4703         struct ifa_cacheinfo ci;
4704
4705         ci.cstamp = cstamp_delta(cstamp);
4706         ci.tstamp = cstamp_delta(tstamp);
4707         ci.ifa_prefered = preferred;
4708         ci.ifa_valid = valid;
4709
4710         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4711 }
4712
4713 static inline int rt_scope(int ifa_scope)
4714 {
4715         if (ifa_scope & IFA_HOST)
4716                 return RT_SCOPE_HOST;
4717         else if (ifa_scope & IFA_LINK)
4718                 return RT_SCOPE_LINK;
4719         else if (ifa_scope & IFA_SITE)
4720                 return RT_SCOPE_SITE;
4721         else
4722                 return RT_SCOPE_UNIVERSE;
4723 }
4724
4725 static inline int inet6_ifaddr_msgsize(void)
4726 {
4727         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4728                + nla_total_size(16) /* IFA_LOCAL */
4729                + nla_total_size(16) /* IFA_ADDRESS */
4730                + nla_total_size(sizeof(struct ifa_cacheinfo))
4731                + nla_total_size(4)  /* IFA_FLAGS */;
4732 }
4733
4734 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4735                              u32 portid, u32 seq, int event, unsigned int flags)
4736 {
4737         struct nlmsghdr  *nlh;
4738         u32 preferred, valid;
4739
4740         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4741         if (!nlh)
4742                 return -EMSGSIZE;
4743
4744         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4745                       ifa->idev->dev->ifindex);
4746
4747         if (!((ifa->flags&IFA_F_PERMANENT) &&
4748               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4749                 preferred = ifa->prefered_lft;
4750                 valid = ifa->valid_lft;
4751                 if (preferred != INFINITY_LIFE_TIME) {
4752                         long tval = (jiffies - ifa->tstamp)/HZ;
4753                         if (preferred > tval)
4754                                 preferred -= tval;
4755                         else
4756                                 preferred = 0;
4757                         if (valid != INFINITY_LIFE_TIME) {
4758                                 if (valid > tval)
4759                                         valid -= tval;
4760                                 else
4761                                         valid = 0;
4762                         }
4763                 }
4764         } else {
4765                 preferred = INFINITY_LIFE_TIME;
4766                 valid = INFINITY_LIFE_TIME;
4767         }
4768
4769         if (!ipv6_addr_any(&ifa->peer_addr)) {
4770                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4771                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4772                         goto error;
4773         } else
4774                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4775                         goto error;
4776
4777         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4778                 goto error;
4779
4780         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4781                 goto error;
4782
4783         nlmsg_end(skb, nlh);
4784         return 0;
4785
4786 error:
4787         nlmsg_cancel(skb, nlh);
4788         return -EMSGSIZE;
4789 }
4790
4791 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4792                                 u32 portid, u32 seq, int event, u16 flags)
4793 {
4794         struct nlmsghdr  *nlh;
4795         u8 scope = RT_SCOPE_UNIVERSE;
4796         int ifindex = ifmca->idev->dev->ifindex;
4797
4798         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4799                 scope = RT_SCOPE_SITE;
4800
4801         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4802         if (!nlh)
4803                 return -EMSGSIZE;
4804
4805         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4806         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4807             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4808                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4809                 nlmsg_cancel(skb, nlh);
4810                 return -EMSGSIZE;
4811         }
4812
4813         nlmsg_end(skb, nlh);
4814         return 0;
4815 }
4816
4817 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4818                                 u32 portid, u32 seq, int event, unsigned int flags)
4819 {
4820         struct nlmsghdr  *nlh;
4821         u8 scope = RT_SCOPE_UNIVERSE;
4822         int ifindex = ifaca->aca_idev->dev->ifindex;
4823
4824         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4825                 scope = RT_SCOPE_SITE;
4826
4827         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4828         if (!nlh)
4829                 return -EMSGSIZE;
4830
4831         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4832         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4833             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4834                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4835                 nlmsg_cancel(skb, nlh);
4836                 return -EMSGSIZE;
4837         }
4838
4839         nlmsg_end(skb, nlh);
4840         return 0;
4841 }
4842
4843 enum addr_type_t {
4844         UNICAST_ADDR,
4845         MULTICAST_ADDR,
4846         ANYCAST_ADDR,
4847 };
4848
4849 /* called with rcu_read_lock() */
4850 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4851                           struct netlink_callback *cb, enum addr_type_t type,
4852                           int s_ip_idx, int *p_ip_idx)
4853 {
4854         struct ifmcaddr6 *ifmca;
4855         struct ifacaddr6 *ifaca;
4856         int err = 1;
4857         int ip_idx = *p_ip_idx;
4858
4859         read_lock_bh(&idev->lock);
4860         switch (type) {
4861         case UNICAST_ADDR: {
4862                 struct inet6_ifaddr *ifa;
4863
4864                 /* unicast address incl. temp addr */
4865                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4866                         if (++ip_idx < s_ip_idx)
4867                                 continue;
4868                         err = inet6_fill_ifaddr(skb, ifa,
4869                                                 NETLINK_CB(cb->skb).portid,
4870                                                 cb->nlh->nlmsg_seq,
4871                                                 RTM_NEWADDR,
4872                                                 NLM_F_MULTI);
4873                         if (err < 0)
4874                                 break;
4875                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4876                 }
4877                 break;
4878         }
4879         case MULTICAST_ADDR:
4880                 /* multicast address */
4881                 for (ifmca = idev->mc_list; ifmca;
4882                      ifmca = ifmca->next, ip_idx++) {
4883                         if (ip_idx < s_ip_idx)
4884                                 continue;
4885                         err = inet6_fill_ifmcaddr(skb, ifmca,
4886                                                   NETLINK_CB(cb->skb).portid,
4887                                                   cb->nlh->nlmsg_seq,
4888                                                   RTM_GETMULTICAST,
4889                                                   NLM_F_MULTI);
4890                         if (err < 0)
4891                                 break;
4892                 }
4893                 break;
4894         case ANYCAST_ADDR:
4895                 /* anycast address */
4896                 for (ifaca = idev->ac_list; ifaca;
4897                      ifaca = ifaca->aca_next, ip_idx++) {
4898                         if (ip_idx < s_ip_idx)
4899                                 continue;
4900                         err = inet6_fill_ifacaddr(skb, ifaca,
4901                                                   NETLINK_CB(cb->skb).portid,
4902                                                   cb->nlh->nlmsg_seq,
4903                                                   RTM_GETANYCAST,
4904                                                   NLM_F_MULTI);
4905                         if (err < 0)
4906                                 break;
4907                 }
4908                 break;
4909         default:
4910                 break;
4911         }
4912         read_unlock_bh(&idev->lock);
4913         *p_ip_idx = ip_idx;
4914         return err;
4915 }
4916
4917 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4918                            enum addr_type_t type)
4919 {
4920         struct net *net = sock_net(skb->sk);
4921         int h, s_h;
4922         int idx, ip_idx;
4923         int s_idx, s_ip_idx;
4924         struct net_device *dev;
4925         struct inet6_dev *idev;
4926         struct hlist_head *head;
4927
4928         s_h = cb->args[0];
4929         s_idx = idx = cb->args[1];
4930         s_ip_idx = ip_idx = cb->args[2];
4931
4932         rcu_read_lock();
4933         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4934         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4935                 idx = 0;
4936                 head = &net->dev_index_head[h];
4937                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4938                         if (idx < s_idx)
4939                                 goto cont;
4940                         if (h > s_h || idx > s_idx)
4941                                 s_ip_idx = 0;
4942                         ip_idx = 0;
4943                         idev = __in6_dev_get(dev);
4944                         if (!idev)
4945                                 goto cont;
4946
4947                         if (in6_dump_addrs(idev, skb, cb, type,
4948                                            s_ip_idx, &ip_idx) < 0)
4949                                 goto done;
4950 cont:
4951                         idx++;
4952                 }
4953         }
4954 done:
4955         rcu_read_unlock();
4956         cb->args[0] = h;
4957         cb->args[1] = idx;
4958         cb->args[2] = ip_idx;
4959
4960         return skb->len;
4961 }
4962
4963 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4964 {
4965         enum addr_type_t type = UNICAST_ADDR;
4966
4967         return inet6_dump_addr(skb, cb, type);
4968 }
4969
4970 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4971 {
4972         enum addr_type_t type = MULTICAST_ADDR;
4973
4974         return inet6_dump_addr(skb, cb, type);
4975 }
4976
4977
4978 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4979 {
4980         enum addr_type_t type = ANYCAST_ADDR;
4981
4982         return inet6_dump_addr(skb, cb, type);
4983 }
4984
4985 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4986                              struct netlink_ext_ack *extack)
4987 {
4988         struct net *net = sock_net(in_skb->sk);
4989         struct ifaddrmsg *ifm;
4990         struct nlattr *tb[IFA_MAX+1];
4991         struct in6_addr *addr = NULL, *peer;
4992         struct net_device *dev = NULL;
4993         struct inet6_ifaddr *ifa;
4994         struct sk_buff *skb;
4995         int err;
4996
4997         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4998                           extack);
4999         if (err < 0)
5000                 return err;
5001
5002         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5003         if (!addr)
5004                 return -EINVAL;
5005
5006         ifm = nlmsg_data(nlh);
5007         if (ifm->ifa_index)
5008                 dev = dev_get_by_index(net, ifm->ifa_index);
5009
5010         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
5011         if (!ifa) {
5012                 err = -EADDRNOTAVAIL;
5013                 goto errout;
5014         }
5015
5016         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5017         if (!skb) {
5018                 err = -ENOBUFS;
5019                 goto errout_ifa;
5020         }
5021
5022         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
5023                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
5024         if (err < 0) {
5025                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5026                 WARN_ON(err == -EMSGSIZE);
5027                 kfree_skb(skb);
5028                 goto errout_ifa;
5029         }
5030         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5031 errout_ifa:
5032         in6_ifa_put(ifa);
5033 errout:
5034         if (dev)
5035                 dev_put(dev);
5036         return err;
5037 }
5038
5039 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5040 {
5041         struct sk_buff *skb;
5042         struct net *net = dev_net(ifa->idev->dev);
5043         int err = -ENOBUFS;
5044
5045         /* Don't send DELADDR notification for TENTATIVE address,
5046          * since NEWADDR notification is sent only after removing
5047          * TENTATIVE flag, if DAD has not failed.
5048          */
5049         if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
5050             event == RTM_DELADDR)
5051                 return;
5052
5053         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5054         if (!skb)
5055                 goto errout;
5056
5057         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
5058         if (err < 0) {
5059                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5060                 WARN_ON(err == -EMSGSIZE);
5061                 kfree_skb(skb);
5062                 goto errout;
5063         }
5064         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5065         return;
5066 errout:
5067         if (err < 0)
5068                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5069 }
5070
5071 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5072                                 __s32 *array, int bytes)
5073 {
5074         BUG_ON(bytes < (DEVCONF_MAX * 4));
5075
5076         memset(array, 0, bytes);
5077         array[DEVCONF_FORWARDING] = cnf->forwarding;
5078         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5079         array[DEVCONF_MTU6] = cnf->mtu6;
5080         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5081         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5082         array[DEVCONF_AUTOCONF] = cnf->autoconf;
5083         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5084         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5085         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5086                 jiffies_to_msecs(cnf->rtr_solicit_interval);
5087         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5088                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5089         array[DEVCONF_RTR_SOLICIT_DELAY] =
5090                 jiffies_to_msecs(cnf->rtr_solicit_delay);
5091         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5092         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5093                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5094         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5095                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5096         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5097         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5098         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5099         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5100         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5101         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5102         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5103         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5104         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5105 #ifdef CONFIG_IPV6_ROUTER_PREF
5106         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5107         array[DEVCONF_RTR_PROBE_INTERVAL] =
5108                 jiffies_to_msecs(cnf->rtr_probe_interval);
5109 #ifdef CONFIG_IPV6_ROUTE_INFO
5110         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5111         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5112 #endif
5113 #endif
5114         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5115         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5116 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5117         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5118         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5119 #endif
5120 #ifdef CONFIG_IPV6_MROUTE
5121         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5122 #endif
5123         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5124         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5125         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5126         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5127         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5128         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5129         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5130         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5131         /* we omit DEVCONF_STABLE_SECRET for now */
5132         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5133         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5134         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5135         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5136         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5137 #ifdef CONFIG_IPV6_SEG6_HMAC
5138         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5139 #endif
5140         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5141         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5142         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5143         array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5144 }
5145
5146 static inline size_t inet6_ifla6_size(void)
5147 {
5148         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5149              + nla_total_size(sizeof(struct ifla_cacheinfo))
5150              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5151              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5152              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5153              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5154 }
5155
5156 static inline size_t inet6_if_nlmsg_size(void)
5157 {
5158         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5159                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5160                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5161                + nla_total_size(4) /* IFLA_MTU */
5162                + nla_total_size(4) /* IFLA_LINK */
5163                + nla_total_size(1) /* IFLA_OPERSTATE */
5164                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5165 }
5166
5167 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5168                                         int bytes)
5169 {
5170         int i;
5171         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5172         BUG_ON(pad < 0);
5173
5174         /* Use put_unaligned() because stats may not be aligned for u64. */
5175         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5176         for (i = 1; i < ICMP6_MIB_MAX; i++)
5177                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5178
5179         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5180 }
5181
5182 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5183                                         int bytes, size_t syncpoff)
5184 {
5185         int i, c;
5186         u64 buff[IPSTATS_MIB_MAX];
5187         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5188
5189         BUG_ON(pad < 0);
5190
5191         memset(buff, 0, sizeof(buff));
5192         buff[0] = IPSTATS_MIB_MAX;
5193
5194         for_each_possible_cpu(c) {
5195                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5196                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5197         }
5198
5199         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5200         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5201 }
5202
5203 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5204                              int bytes)
5205 {
5206         switch (attrtype) {
5207         case IFLA_INET6_STATS:
5208                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5209                                      offsetof(struct ipstats_mib, syncp));
5210                 break;
5211         case IFLA_INET6_ICMP6STATS:
5212                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5213                 break;
5214         }
5215 }
5216
5217 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5218                                   u32 ext_filter_mask)
5219 {
5220         struct nlattr *nla;
5221         struct ifla_cacheinfo ci;
5222
5223         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5224                 goto nla_put_failure;
5225         ci.max_reasm_len = IPV6_MAXPLEN;
5226         ci.tstamp = cstamp_delta(idev->tstamp);
5227         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5228         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5229         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5230                 goto nla_put_failure;
5231         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5232         if (!nla)
5233                 goto nla_put_failure;
5234         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5235
5236         /* XXX - MC not implemented */
5237
5238         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5239                 return 0;
5240
5241         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5242         if (!nla)
5243                 goto nla_put_failure;
5244         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5245
5246         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5247         if (!nla)
5248                 goto nla_put_failure;
5249         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5250
5251         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5252         if (!nla)
5253                 goto nla_put_failure;
5254
5255         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5256                 goto nla_put_failure;
5257
5258         read_lock_bh(&idev->lock);
5259         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5260         read_unlock_bh(&idev->lock);
5261
5262         return 0;
5263
5264 nla_put_failure:
5265         return -EMSGSIZE;
5266 }
5267
5268 static size_t inet6_get_link_af_size(const struct net_device *dev,
5269                                      u32 ext_filter_mask)
5270 {
5271         if (!__in6_dev_get(dev))
5272                 return 0;
5273
5274         return inet6_ifla6_size();
5275 }
5276
5277 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5278                               u32 ext_filter_mask)
5279 {
5280         struct inet6_dev *idev = __in6_dev_get(dev);
5281
5282         if (!idev)
5283                 return -ENODATA;
5284
5285         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5286                 return -EMSGSIZE;
5287
5288         return 0;
5289 }
5290
5291 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5292 {
5293         struct inet6_ifaddr *ifp;
5294         struct net_device *dev = idev->dev;
5295         bool clear_token, update_rs = false;
5296         struct in6_addr ll_addr;
5297
5298         ASSERT_RTNL();
5299
5300         if (!token)
5301                 return -EINVAL;
5302         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5303                 return -EINVAL;
5304         if (!ipv6_accept_ra(idev))
5305                 return -EINVAL;
5306         if (idev->cnf.rtr_solicits == 0)
5307                 return -EINVAL;
5308
5309         write_lock_bh(&idev->lock);
5310
5311         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5312         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5313
5314         write_unlock_bh(&idev->lock);
5315
5316         clear_token = ipv6_addr_any(token);
5317         if (clear_token)
5318                 goto update_lft;
5319
5320         if (!idev->dead && (idev->if_flags & IF_READY) &&
5321             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5322                              IFA_F_OPTIMISTIC)) {
5323                 /* If we're not ready, then normal ifup will take care
5324                  * of this. Otherwise, we need to request our rs here.
5325                  */
5326                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5327                 update_rs = true;
5328         }
5329
5330 update_lft:
5331         write_lock_bh(&idev->lock);
5332
5333         if (update_rs) {
5334                 idev->if_flags |= IF_RS_SENT;
5335                 idev->rs_interval = rfc3315_s14_backoff_init(
5336                         idev->cnf.rtr_solicit_interval);
5337                 idev->rs_probes = 1;
5338                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5339         }
5340
5341         /* Well, that's kinda nasty ... */
5342         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5343                 spin_lock(&ifp->lock);
5344                 if (ifp->tokenized) {
5345                         ifp->valid_lft = 0;
5346                         ifp->prefered_lft = 0;
5347                 }
5348                 spin_unlock(&ifp->lock);
5349         }
5350
5351         write_unlock_bh(&idev->lock);
5352         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5353         addrconf_verify_rtnl();
5354         return 0;
5355 }
5356
5357 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5358         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5359         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5360 };
5361
5362 static int inet6_validate_link_af(const struct net_device *dev,
5363                                   const struct nlattr *nla)
5364 {
5365         struct nlattr *tb[IFLA_INET6_MAX + 1];
5366
5367         if (dev && !__in6_dev_get(dev))
5368                 return -EAFNOSUPPORT;
5369
5370         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5371                                 NULL);
5372 }
5373
5374 static int check_addr_gen_mode(int mode)
5375 {
5376         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5377             mode != IN6_ADDR_GEN_MODE_NONE &&
5378             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5379             mode != IN6_ADDR_GEN_MODE_RANDOM)
5380                 return -EINVAL;
5381         return 1;
5382 }
5383
5384 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5385                                 int mode)
5386 {
5387         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5388             !idev->cnf.stable_secret.initialized &&
5389             !net->ipv6.devconf_dflt->stable_secret.initialized)
5390                 return -EINVAL;
5391         return 1;
5392 }
5393
5394 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5395 {
5396         int err = -EINVAL;
5397         struct inet6_dev *idev = __in6_dev_get(dev);
5398         struct nlattr *tb[IFLA_INET6_MAX + 1];
5399
5400         if (!idev)
5401                 return -EAFNOSUPPORT;
5402
5403         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5404                 BUG();
5405
5406         if (tb[IFLA_INET6_TOKEN]) {
5407                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5408                 if (err)
5409                         return err;
5410         }
5411
5412         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5413                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5414
5415                 if (check_addr_gen_mode(mode) < 0 ||
5416                     check_stable_privacy(idev, dev_net(dev), mode) < 0)
5417                         return -EINVAL;
5418
5419                 idev->cnf.addr_gen_mode = mode;
5420                 err = 0;
5421         }
5422
5423         return err;
5424 }
5425
5426 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5427                              u32 portid, u32 seq, int event, unsigned int flags)
5428 {
5429         struct net_device *dev = idev->dev;
5430         struct ifinfomsg *hdr;
5431         struct nlmsghdr *nlh;
5432         void *protoinfo;
5433
5434         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5435         if (!nlh)
5436                 return -EMSGSIZE;
5437
5438         hdr = nlmsg_data(nlh);
5439         hdr->ifi_family = AF_INET6;
5440         hdr->__ifi_pad = 0;
5441         hdr->ifi_type = dev->type;
5442         hdr->ifi_index = dev->ifindex;
5443         hdr->ifi_flags = dev_get_flags(dev);
5444         hdr->ifi_change = 0;
5445
5446         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5447             (dev->addr_len &&
5448              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5449             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5450             (dev->ifindex != dev_get_iflink(dev) &&
5451              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5452             nla_put_u8(skb, IFLA_OPERSTATE,
5453                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5454                 goto nla_put_failure;
5455         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5456         if (!protoinfo)
5457                 goto nla_put_failure;
5458
5459         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5460                 goto nla_put_failure;
5461
5462         nla_nest_end(skb, protoinfo);
5463         nlmsg_end(skb, nlh);
5464         return 0;
5465
5466 nla_put_failure:
5467         nlmsg_cancel(skb, nlh);
5468         return -EMSGSIZE;
5469 }
5470
5471 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5472 {
5473         struct net *net = sock_net(skb->sk);
5474         int h, s_h;
5475         int idx = 0, s_idx;
5476         struct net_device *dev;
5477         struct inet6_dev *idev;
5478         struct hlist_head *head;
5479
5480         s_h = cb->args[0];
5481         s_idx = cb->args[1];
5482
5483         rcu_read_lock();
5484         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5485                 idx = 0;
5486                 head = &net->dev_index_head[h];
5487                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5488                         if (idx < s_idx)
5489                                 goto cont;
5490                         idev = __in6_dev_get(dev);
5491                         if (!idev)
5492                                 goto cont;
5493                         if (inet6_fill_ifinfo(skb, idev,
5494                                               NETLINK_CB(cb->skb).portid,
5495                                               cb->nlh->nlmsg_seq,
5496                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5497                                 goto out;
5498 cont:
5499                         idx++;
5500                 }
5501         }
5502 out:
5503         rcu_read_unlock();
5504         cb->args[1] = idx;
5505         cb->args[0] = h;
5506
5507         return skb->len;
5508 }
5509
5510 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5511 {
5512         struct sk_buff *skb;
5513         struct net *net = dev_net(idev->dev);
5514         int err = -ENOBUFS;
5515
5516         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5517         if (!skb)
5518                 goto errout;
5519
5520         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5521         if (err < 0) {
5522                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5523                 WARN_ON(err == -EMSGSIZE);
5524                 kfree_skb(skb);
5525                 goto errout;
5526         }
5527         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5528         return;
5529 errout:
5530         if (err < 0)
5531                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5532 }
5533
5534 static inline size_t inet6_prefix_nlmsg_size(void)
5535 {
5536         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5537                + nla_total_size(sizeof(struct in6_addr))
5538                + nla_total_size(sizeof(struct prefix_cacheinfo));
5539 }
5540
5541 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5542                              struct prefix_info *pinfo, u32 portid, u32 seq,
5543                              int event, unsigned int flags)
5544 {
5545         struct prefixmsg *pmsg;
5546         struct nlmsghdr *nlh;
5547         struct prefix_cacheinfo ci;
5548
5549         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5550         if (!nlh)
5551                 return -EMSGSIZE;
5552
5553         pmsg = nlmsg_data(nlh);
5554         pmsg->prefix_family = AF_INET6;
5555         pmsg->prefix_pad1 = 0;
5556         pmsg->prefix_pad2 = 0;
5557         pmsg->prefix_ifindex = idev->dev->ifindex;
5558         pmsg->prefix_len = pinfo->prefix_len;
5559         pmsg->prefix_type = pinfo->type;
5560         pmsg->prefix_pad3 = 0;
5561         pmsg->prefix_flags = 0;
5562         if (pinfo->onlink)
5563                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5564         if (pinfo->autoconf)
5565                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5566
5567         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5568                 goto nla_put_failure;
5569         ci.preferred_time = ntohl(pinfo->prefered);
5570         ci.valid_time = ntohl(pinfo->valid);
5571         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5572                 goto nla_put_failure;
5573         nlmsg_end(skb, nlh);
5574         return 0;
5575
5576 nla_put_failure:
5577         nlmsg_cancel(skb, nlh);
5578         return -EMSGSIZE;
5579 }
5580
5581 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5582                          struct prefix_info *pinfo)
5583 {
5584         struct sk_buff *skb;
5585         struct net *net = dev_net(idev->dev);
5586         int err = -ENOBUFS;
5587
5588         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5589         if (!skb)
5590                 goto errout;
5591
5592         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5593         if (err < 0) {
5594                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5595                 WARN_ON(err == -EMSGSIZE);
5596                 kfree_skb(skb);
5597                 goto errout;
5598         }
5599         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5600         return;
5601 errout:
5602         if (err < 0)
5603                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5604 }
5605
5606 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5607 {
5608         struct net *net = dev_net(ifp->idev->dev);
5609
5610         if (event)
5611                 ASSERT_RTNL();
5612
5613         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5614
5615         switch (event) {
5616         case RTM_NEWADDR:
5617                 /*
5618                  * If the address was optimistic
5619                  * we inserted the route at the start of
5620                  * our DAD process, so we don't need
5621                  * to do it again
5622                  */
5623                 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5624                         ip6_ins_rt(ifp->rt);
5625                 if (ifp->idev->cnf.forwarding)
5626                         addrconf_join_anycast(ifp);
5627                 if (!ipv6_addr_any(&ifp->peer_addr))
5628                         addrconf_prefix_route(&ifp->peer_addr, 128,
5629                                               ifp->idev->dev, 0, 0);
5630                 break;
5631         case RTM_DELADDR:
5632                 if (ifp->idev->cnf.forwarding)
5633                         addrconf_leave_anycast(ifp);
5634                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5635                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5636                         struct rt6_info *rt;
5637
5638                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5639                                                        ifp->idev->dev, 0, 0);
5640                         if (rt)
5641                                 ip6_del_rt(rt);
5642                 }
5643                 if (ifp->rt) {
5644                         if (dst_hold_safe(&ifp->rt->dst))
5645                                 ip6_del_rt(ifp->rt);
5646                 }
5647                 rt_genid_bump_ipv6(net);
5648                 break;
5649         }
5650         atomic_inc(&net->ipv6.dev_addr_genid);
5651 }
5652
5653 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5654 {
5655         rcu_read_lock_bh();
5656         if (likely(ifp->idev->dead == 0))
5657                 __ipv6_ifa_notify(event, ifp);
5658         rcu_read_unlock_bh();
5659 }
5660
5661 #ifdef CONFIG_SYSCTL
5662
5663 static
5664 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5665                            void __user *buffer, size_t *lenp, loff_t *ppos)
5666 {
5667         int *valp = ctl->data;
5668         int val = *valp;
5669         loff_t pos = *ppos;
5670         struct ctl_table lctl;
5671         int ret;
5672
5673         /*
5674          * ctl->data points to idev->cnf.forwarding, we should
5675          * not modify it until we get the rtnl lock.
5676          */
5677         lctl = *ctl;
5678         lctl.data = &val;
5679
5680         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5681
5682         if (write)
5683                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5684         if (ret)
5685                 *ppos = pos;
5686         return ret;
5687 }
5688
5689 static
5690 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5691                         void __user *buffer, size_t *lenp, loff_t *ppos)
5692 {
5693         struct inet6_dev *idev = ctl->extra1;
5694         int min_mtu = IPV6_MIN_MTU;
5695         struct ctl_table lctl;
5696
5697         lctl = *ctl;
5698         lctl.extra1 = &min_mtu;
5699         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5700
5701         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5702 }
5703
5704 static void dev_disable_change(struct inet6_dev *idev)
5705 {
5706         struct netdev_notifier_info info;
5707
5708         if (!idev || !idev->dev)
5709                 return;
5710
5711         netdev_notifier_info_init(&info, idev->dev);
5712         if (idev->cnf.disable_ipv6)
5713                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5714         else
5715                 addrconf_notify(NULL, NETDEV_UP, &info);
5716 }
5717
5718 static void addrconf_disable_change(struct net *net, __s32 newf)
5719 {
5720         struct net_device *dev;
5721         struct inet6_dev *idev;
5722
5723         for_each_netdev(net, dev) {
5724                 idev = __in6_dev_get(dev);
5725                 if (idev) {
5726                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5727                         idev->cnf.disable_ipv6 = newf;
5728                         if (changed)
5729                                 dev_disable_change(idev);
5730                 }
5731         }
5732 }
5733
5734 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5735 {
5736         struct net *net;
5737         int old;
5738
5739         if (!rtnl_trylock())
5740                 return restart_syscall();
5741
5742         net = (struct net *)table->extra2;
5743         old = *p;
5744         *p = newf;
5745
5746         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5747                 rtnl_unlock();
5748                 return 0;
5749         }
5750
5751         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5752                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5753                 addrconf_disable_change(net, newf);
5754         } else if ((!newf) ^ (!old))
5755                 dev_disable_change((struct inet6_dev *)table->extra1);
5756
5757         rtnl_unlock();
5758         return 0;
5759 }
5760
5761 static
5762 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5763                             void __user *buffer, size_t *lenp, loff_t *ppos)
5764 {
5765         int *valp = ctl->data;
5766         int val = *valp;
5767         loff_t pos = *ppos;
5768         struct ctl_table lctl;
5769         int ret;
5770
5771         /*
5772          * ctl->data points to idev->cnf.disable_ipv6, we should
5773          * not modify it until we get the rtnl lock.
5774          */
5775         lctl = *ctl;
5776         lctl.data = &val;
5777
5778         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5779
5780         if (write)
5781                 ret = addrconf_disable_ipv6(ctl, valp, val);
5782         if (ret)
5783                 *ppos = pos;
5784         return ret;
5785 }
5786
5787 static
5788 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5789                               void __user *buffer, size_t *lenp, loff_t *ppos)
5790 {
5791         int *valp = ctl->data;
5792         int ret;
5793         int old, new;
5794
5795         old = *valp;
5796         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5797         new = *valp;
5798
5799         if (write && old != new) {
5800                 struct net *net = ctl->extra2;
5801
5802                 if (!rtnl_trylock())
5803                         return restart_syscall();
5804
5805                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5806                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5807                                                      NETCONFA_PROXY_NEIGH,
5808                                                      NETCONFA_IFINDEX_DEFAULT,
5809                                                      net->ipv6.devconf_dflt);
5810                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5811                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5812                                                      NETCONFA_PROXY_NEIGH,
5813                                                      NETCONFA_IFINDEX_ALL,
5814                                                      net->ipv6.devconf_all);
5815                 else {
5816                         struct inet6_dev *idev = ctl->extra1;
5817
5818                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5819                                                      NETCONFA_PROXY_NEIGH,
5820                                                      idev->dev->ifindex,
5821                                                      &idev->cnf);
5822                 }
5823                 rtnl_unlock();
5824         }
5825
5826         return ret;
5827 }
5828
5829 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5830                                          void __user *buffer, size_t *lenp,
5831                                          loff_t *ppos)
5832 {
5833         int ret = 0;
5834         int new_val;
5835         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5836         struct net *net = (struct net *)ctl->extra2;
5837
5838         if (!rtnl_trylock())
5839                 return restart_syscall();
5840
5841         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5842
5843         if (write) {
5844                 new_val = *((int *)ctl->data);
5845
5846                 if (check_addr_gen_mode(new_val) < 0) {
5847                         ret = -EINVAL;
5848                         goto out;
5849                 }
5850
5851                 /* request for default */
5852                 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5853                         ipv6_devconf_dflt.addr_gen_mode = new_val;
5854
5855                 /* request for individual net device */
5856                 } else {
5857                         if (!idev)
5858                                 goto out;
5859
5860                         if (check_stable_privacy(idev, net, new_val) < 0) {
5861                                 ret = -EINVAL;
5862                                 goto out;
5863                         }
5864
5865                         if (idev->cnf.addr_gen_mode != new_val) {
5866                                 idev->cnf.addr_gen_mode = new_val;
5867                                 addrconf_dev_config(idev->dev);
5868                         }
5869                 }
5870         }
5871
5872 out:
5873         rtnl_unlock();
5874
5875         return ret;
5876 }
5877
5878 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5879                                          void __user *buffer, size_t *lenp,
5880                                          loff_t *ppos)
5881 {
5882         int err;
5883         struct in6_addr addr;
5884         char str[IPV6_MAX_STRLEN];
5885         struct ctl_table lctl = *ctl;
5886         struct net *net = ctl->extra2;
5887         struct ipv6_stable_secret *secret = ctl->data;
5888
5889         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5890                 return -EIO;
5891
5892         lctl.maxlen = IPV6_MAX_STRLEN;
5893         lctl.data = str;
5894
5895         if (!rtnl_trylock())
5896                 return restart_syscall();
5897
5898         if (!write && !secret->initialized) {
5899                 err = -EIO;
5900                 goto out;
5901         }
5902
5903         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5904         if (err >= sizeof(str)) {
5905                 err = -EIO;
5906                 goto out;
5907         }
5908
5909         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5910         if (err || !write)
5911                 goto out;
5912
5913         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5914                 err = -EIO;
5915                 goto out;
5916         }
5917
5918         secret->initialized = true;
5919         secret->secret = addr;
5920
5921         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5922                 struct net_device *dev;
5923
5924                 for_each_netdev(net, dev) {
5925                         struct inet6_dev *idev = __in6_dev_get(dev);
5926
5927                         if (idev) {
5928                                 idev->cnf.addr_gen_mode =
5929                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5930                         }
5931                 }
5932         } else {
5933                 struct inet6_dev *idev = ctl->extra1;
5934
5935                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5936         }
5937
5938 out:
5939         rtnl_unlock();
5940
5941         return err;
5942 }
5943
5944 static
5945 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5946                                                 int write,
5947                                                 void __user *buffer,
5948                                                 size_t *lenp,
5949                                                 loff_t *ppos)
5950 {
5951         int *valp = ctl->data;
5952         int val = *valp;
5953         loff_t pos = *ppos;
5954         struct ctl_table lctl;
5955         int ret;
5956
5957         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5958          * we should not modify it until we get the rtnl lock.
5959          */
5960         lctl = *ctl;
5961         lctl.data = &val;
5962
5963         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5964
5965         if (write)
5966                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5967         if (ret)
5968                 *ppos = pos;
5969         return ret;
5970 }
5971
5972 static
5973 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5974 {
5975         if (rt) {
5976                 if (action)
5977                         rt->dst.flags |= DST_NOPOLICY;
5978                 else
5979                         rt->dst.flags &= ~DST_NOPOLICY;
5980         }
5981 }
5982
5983 static
5984 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5985 {
5986         struct inet6_ifaddr *ifa;
5987
5988         read_lock_bh(&idev->lock);
5989         list_for_each_entry(ifa, &idev->addr_list, if_list) {
5990                 spin_lock(&ifa->lock);
5991                 if (ifa->rt) {
5992                         struct rt6_info *rt = ifa->rt;
5993                         int cpu;
5994
5995                         rcu_read_lock();
5996                         addrconf_set_nopolicy(ifa->rt, val);
5997                         if (rt->rt6i_pcpu) {
5998                                 for_each_possible_cpu(cpu) {
5999                                         struct rt6_info **rtp;
6000
6001                                         rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
6002                                         addrconf_set_nopolicy(*rtp, val);
6003                                 }
6004                         }
6005                         rcu_read_unlock();
6006                 }
6007                 spin_unlock(&ifa->lock);
6008         }
6009         read_unlock_bh(&idev->lock);
6010 }
6011
6012 static
6013 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6014 {
6015         struct inet6_dev *idev;
6016         struct net *net;
6017
6018         if (!rtnl_trylock())
6019                 return restart_syscall();
6020
6021         *valp = val;
6022
6023         net = (struct net *)ctl->extra2;
6024         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6025                 rtnl_unlock();
6026                 return 0;
6027         }
6028
6029         if (valp == &net->ipv6.devconf_all->disable_policy)  {
6030                 struct net_device *dev;
6031
6032                 for_each_netdev(net, dev) {
6033                         idev = __in6_dev_get(dev);
6034                         if (idev)
6035                                 addrconf_disable_policy_idev(idev, val);
6036                 }
6037         } else {
6038                 idev = (struct inet6_dev *)ctl->extra1;
6039                 addrconf_disable_policy_idev(idev, val);
6040         }
6041
6042         rtnl_unlock();
6043         return 0;
6044 }
6045
6046 static
6047 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6048                                    void __user *buffer, size_t *lenp,
6049                                    loff_t *ppos)
6050 {
6051         int *valp = ctl->data;
6052         int val = *valp;
6053         loff_t pos = *ppos;
6054         struct ctl_table lctl;
6055         int ret;
6056
6057         lctl = *ctl;
6058         lctl.data = &val;
6059         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6060
6061         if (write && (*valp != val))
6062                 ret = addrconf_disable_policy(ctl, valp, val);
6063
6064         if (ret)
6065                 *ppos = pos;
6066
6067         return ret;
6068 }
6069
6070 static int minus_one = -1;
6071 static const int zero = 0;
6072 static const int one = 1;
6073 static const int two_five_five = 255;
6074
6075 static const struct ctl_table addrconf_sysctl[] = {
6076         {
6077                 .procname       = "forwarding",
6078                 .data           = &ipv6_devconf.forwarding,
6079                 .maxlen         = sizeof(int),
6080                 .mode           = 0644,
6081                 .proc_handler   = addrconf_sysctl_forward,
6082         },
6083         {
6084                 .procname       = "hop_limit",
6085                 .data           = &ipv6_devconf.hop_limit,
6086                 .maxlen         = sizeof(int),
6087                 .mode           = 0644,
6088                 .proc_handler   = proc_dointvec_minmax,
6089                 .extra1         = (void *)&one,
6090                 .extra2         = (void *)&two_five_five,
6091         },
6092         {
6093                 .procname       = "mtu",
6094                 .data           = &ipv6_devconf.mtu6,
6095                 .maxlen         = sizeof(int),
6096                 .mode           = 0644,
6097                 .proc_handler   = addrconf_sysctl_mtu,
6098         },
6099         {
6100                 .procname       = "accept_ra",
6101                 .data           = &ipv6_devconf.accept_ra,
6102                 .maxlen         = sizeof(int),
6103                 .mode           = 0644,
6104                 .proc_handler   = proc_dointvec,
6105         },
6106         {
6107                 .procname       = "accept_redirects",
6108                 .data           = &ipv6_devconf.accept_redirects,
6109                 .maxlen         = sizeof(int),
6110                 .mode           = 0644,
6111                 .proc_handler   = proc_dointvec,
6112         },
6113         {
6114                 .procname       = "autoconf",
6115                 .data           = &ipv6_devconf.autoconf,
6116                 .maxlen         = sizeof(int),
6117                 .mode           = 0644,
6118                 .proc_handler   = proc_dointvec,
6119         },
6120         {
6121                 .procname       = "dad_transmits",
6122                 .data           = &ipv6_devconf.dad_transmits,
6123                 .maxlen         = sizeof(int),
6124                 .mode           = 0644,
6125                 .proc_handler   = proc_dointvec,
6126         },
6127         {
6128                 .procname       = "router_solicitations",
6129                 .data           = &ipv6_devconf.rtr_solicits,
6130                 .maxlen         = sizeof(int),
6131                 .mode           = 0644,
6132                 .proc_handler   = proc_dointvec_minmax,
6133                 .extra1         = &minus_one,
6134         },
6135         {
6136                 .procname       = "router_solicitation_interval",
6137                 .data           = &ipv6_devconf.rtr_solicit_interval,
6138                 .maxlen         = sizeof(int),
6139                 .mode           = 0644,
6140                 .proc_handler   = proc_dointvec_jiffies,
6141         },
6142         {
6143                 .procname       = "router_solicitation_max_interval",
6144                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6145                 .maxlen         = sizeof(int),
6146                 .mode           = 0644,
6147                 .proc_handler   = proc_dointvec_jiffies,
6148         },
6149         {
6150                 .procname       = "router_solicitation_delay",
6151                 .data           = &ipv6_devconf.rtr_solicit_delay,
6152                 .maxlen         = sizeof(int),
6153                 .mode           = 0644,
6154                 .proc_handler   = proc_dointvec_jiffies,
6155         },
6156         {
6157                 .procname       = "force_mld_version",
6158                 .data           = &ipv6_devconf.force_mld_version,
6159                 .maxlen         = sizeof(int),
6160                 .mode           = 0644,
6161                 .proc_handler   = proc_dointvec,
6162         },
6163         {
6164                 .procname       = "mldv1_unsolicited_report_interval",
6165                 .data           =
6166                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6167                 .maxlen         = sizeof(int),
6168                 .mode           = 0644,
6169                 .proc_handler   = proc_dointvec_ms_jiffies,
6170         },
6171         {
6172                 .procname       = "mldv2_unsolicited_report_interval",
6173                 .data           =
6174                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6175                 .maxlen         = sizeof(int),
6176                 .mode           = 0644,
6177                 .proc_handler   = proc_dointvec_ms_jiffies,
6178         },
6179         {
6180                 .procname       = "use_tempaddr",
6181                 .data           = &ipv6_devconf.use_tempaddr,
6182                 .maxlen         = sizeof(int),
6183                 .mode           = 0644,
6184                 .proc_handler   = proc_dointvec,
6185         },
6186         {
6187                 .procname       = "temp_valid_lft",
6188                 .data           = &ipv6_devconf.temp_valid_lft,
6189                 .maxlen         = sizeof(int),
6190                 .mode           = 0644,
6191                 .proc_handler   = proc_dointvec,
6192         },
6193         {
6194                 .procname       = "temp_prefered_lft",
6195                 .data           = &ipv6_devconf.temp_prefered_lft,
6196                 .maxlen         = sizeof(int),
6197                 .mode           = 0644,
6198                 .proc_handler   = proc_dointvec,
6199         },
6200         {
6201                 .procname       = "regen_max_retry",
6202                 .data           = &ipv6_devconf.regen_max_retry,
6203                 .maxlen         = sizeof(int),
6204                 .mode           = 0644,
6205                 .proc_handler   = proc_dointvec,
6206         },
6207         {
6208                 .procname       = "max_desync_factor",
6209                 .data           = &ipv6_devconf.max_desync_factor,
6210                 .maxlen         = sizeof(int),
6211                 .mode           = 0644,
6212                 .proc_handler   = proc_dointvec,
6213         },
6214         {
6215                 .procname       = "max_addresses",
6216                 .data           = &ipv6_devconf.max_addresses,
6217                 .maxlen         = sizeof(int),
6218                 .mode           = 0644,
6219                 .proc_handler   = proc_dointvec,
6220         },
6221         {
6222                 .procname       = "accept_ra_defrtr",
6223                 .data           = &ipv6_devconf.accept_ra_defrtr,
6224                 .maxlen         = sizeof(int),
6225                 .mode           = 0644,
6226                 .proc_handler   = proc_dointvec,
6227         },
6228         {
6229                 .procname       = "accept_ra_min_hop_limit",
6230                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6231                 .maxlen         = sizeof(int),
6232                 .mode           = 0644,
6233                 .proc_handler   = proc_dointvec,
6234         },
6235         {
6236                 .procname       = "accept_ra_pinfo",
6237                 .data           = &ipv6_devconf.accept_ra_pinfo,
6238                 .maxlen         = sizeof(int),
6239                 .mode           = 0644,
6240                 .proc_handler   = proc_dointvec,
6241         },
6242 #ifdef CONFIG_IPV6_ROUTER_PREF
6243         {
6244                 .procname       = "accept_ra_rtr_pref",
6245                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6246                 .maxlen         = sizeof(int),
6247                 .mode           = 0644,
6248                 .proc_handler   = proc_dointvec,
6249         },
6250         {
6251                 .procname       = "router_probe_interval",
6252                 .data           = &ipv6_devconf.rtr_probe_interval,
6253                 .maxlen         = sizeof(int),
6254                 .mode           = 0644,
6255                 .proc_handler   = proc_dointvec_jiffies,
6256         },
6257 #ifdef CONFIG_IPV6_ROUTE_INFO
6258         {
6259                 .procname       = "accept_ra_rt_info_min_plen",
6260                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6261                 .maxlen         = sizeof(int),
6262                 .mode           = 0644,
6263                 .proc_handler   = proc_dointvec,
6264         },
6265         {
6266                 .procname       = "accept_ra_rt_info_max_plen",
6267                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6268                 .maxlen         = sizeof(int),
6269                 .mode           = 0644,
6270                 .proc_handler   = proc_dointvec,
6271         },
6272 #endif
6273 #endif
6274         {
6275                 .procname       = "proxy_ndp",
6276                 .data           = &ipv6_devconf.proxy_ndp,
6277                 .maxlen         = sizeof(int),
6278                 .mode           = 0644,
6279                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6280         },
6281         {
6282                 .procname       = "accept_source_route",
6283                 .data           = &ipv6_devconf.accept_source_route,
6284                 .maxlen         = sizeof(int),
6285                 .mode           = 0644,
6286                 .proc_handler   = proc_dointvec,
6287         },
6288 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6289         {
6290                 .procname       = "optimistic_dad",
6291                 .data           = &ipv6_devconf.optimistic_dad,
6292                 .maxlen         = sizeof(int),
6293                 .mode           = 0644,
6294                 .proc_handler   = proc_dointvec,
6295         },
6296         {
6297                 .procname       = "use_optimistic",
6298                 .data           = &ipv6_devconf.use_optimistic,
6299                 .maxlen         = sizeof(int),
6300                 .mode           = 0644,
6301                 .proc_handler   = proc_dointvec,
6302         },
6303 #endif
6304 #ifdef CONFIG_IPV6_MROUTE
6305         {
6306                 .procname       = "mc_forwarding",
6307                 .data           = &ipv6_devconf.mc_forwarding,
6308                 .maxlen         = sizeof(int),
6309                 .mode           = 0444,
6310                 .proc_handler   = proc_dointvec,
6311         },
6312 #endif
6313         {
6314                 .procname       = "disable_ipv6",
6315                 .data           = &ipv6_devconf.disable_ipv6,
6316                 .maxlen         = sizeof(int),
6317                 .mode           = 0644,
6318                 .proc_handler   = addrconf_sysctl_disable,
6319         },
6320         {
6321                 .procname       = "accept_dad",
6322                 .data           = &ipv6_devconf.accept_dad,
6323                 .maxlen         = sizeof(int),
6324                 .mode           = 0644,
6325                 .proc_handler   = proc_dointvec,
6326         },
6327         {
6328                 .procname       = "force_tllao",
6329                 .data           = &ipv6_devconf.force_tllao,
6330                 .maxlen         = sizeof(int),
6331                 .mode           = 0644,
6332                 .proc_handler   = proc_dointvec
6333         },
6334         {
6335                 .procname       = "ndisc_notify",
6336                 .data           = &ipv6_devconf.ndisc_notify,
6337                 .maxlen         = sizeof(int),
6338                 .mode           = 0644,
6339                 .proc_handler   = proc_dointvec
6340         },
6341         {
6342                 .procname       = "suppress_frag_ndisc",
6343                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6344                 .maxlen         = sizeof(int),
6345                 .mode           = 0644,
6346                 .proc_handler   = proc_dointvec
6347         },
6348         {
6349                 .procname       = "accept_ra_from_local",
6350                 .data           = &ipv6_devconf.accept_ra_from_local,
6351                 .maxlen         = sizeof(int),
6352                 .mode           = 0644,
6353                 .proc_handler   = proc_dointvec,
6354         },
6355         {
6356                 .procname       = "accept_ra_mtu",
6357                 .data           = &ipv6_devconf.accept_ra_mtu,
6358                 .maxlen         = sizeof(int),
6359                 .mode           = 0644,
6360                 .proc_handler   = proc_dointvec,
6361         },
6362         {
6363                 .procname       = "stable_secret",
6364                 .data           = &ipv6_devconf.stable_secret,
6365                 .maxlen         = IPV6_MAX_STRLEN,
6366                 .mode           = 0600,
6367                 .proc_handler   = addrconf_sysctl_stable_secret,
6368         },
6369         {
6370                 .procname       = "use_oif_addrs_only",
6371                 .data           = &ipv6_devconf.use_oif_addrs_only,
6372                 .maxlen         = sizeof(int),
6373                 .mode           = 0644,
6374                 .proc_handler   = proc_dointvec,
6375         },
6376         {
6377                 .procname       = "ignore_routes_with_linkdown",
6378                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6379                 .maxlen         = sizeof(int),
6380                 .mode           = 0644,
6381                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6382         },
6383         {
6384                 .procname       = "drop_unicast_in_l2_multicast",
6385                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6386                 .maxlen         = sizeof(int),
6387                 .mode           = 0644,
6388                 .proc_handler   = proc_dointvec,
6389         },
6390         {
6391                 .procname       = "drop_unsolicited_na",
6392                 .data           = &ipv6_devconf.drop_unsolicited_na,
6393                 .maxlen         = sizeof(int),
6394                 .mode           = 0644,
6395                 .proc_handler   = proc_dointvec,
6396         },
6397         {
6398                 .procname       = "keep_addr_on_down",
6399                 .data           = &ipv6_devconf.keep_addr_on_down,
6400                 .maxlen         = sizeof(int),
6401                 .mode           = 0644,
6402                 .proc_handler   = proc_dointvec,
6403
6404         },
6405         {
6406                 .procname       = "seg6_enabled",
6407                 .data           = &ipv6_devconf.seg6_enabled,
6408                 .maxlen         = sizeof(int),
6409                 .mode           = 0644,
6410                 .proc_handler   = proc_dointvec,
6411         },
6412 #ifdef CONFIG_IPV6_SEG6_HMAC
6413         {
6414                 .procname       = "seg6_require_hmac",
6415                 .data           = &ipv6_devconf.seg6_require_hmac,
6416                 .maxlen         = sizeof(int),
6417                 .mode           = 0644,
6418                 .proc_handler   = proc_dointvec,
6419         },
6420 #endif
6421         {
6422                 .procname       = "enhanced_dad",
6423                 .data           = &ipv6_devconf.enhanced_dad,
6424                 .maxlen         = sizeof(int),
6425                 .mode           = 0644,
6426                 .proc_handler   = proc_dointvec,
6427         },
6428         {
6429                 .procname               = "addr_gen_mode",
6430                 .data                   = &ipv6_devconf.addr_gen_mode,
6431                 .maxlen                 = sizeof(int),
6432                 .mode                   = 0644,
6433                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6434         },
6435         {
6436                 .procname       = "disable_policy",
6437                 .data           = &ipv6_devconf.disable_policy,
6438                 .maxlen         = sizeof(int),
6439                 .mode           = 0644,
6440                 .proc_handler   = addrconf_sysctl_disable_policy,
6441         },
6442         {
6443                 .procname       = "ndisc_tclass",
6444                 .data           = &ipv6_devconf.ndisc_tclass,
6445                 .maxlen         = sizeof(int),
6446                 .mode           = 0644,
6447                 .proc_handler   = proc_dointvec_minmax,
6448                 .extra1         = (void *)&zero,
6449                 .extra2         = (void *)&two_five_five,
6450         },
6451         {
6452                 /* sentinel */
6453         }
6454 };
6455
6456 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6457                 struct inet6_dev *idev, struct ipv6_devconf *p)
6458 {
6459         int i, ifindex;
6460         struct ctl_table *table;
6461         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6462
6463         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6464         if (!table)
6465                 goto out;
6466
6467         for (i = 0; table[i].data; i++) {
6468                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6469                 /* If one of these is already set, then it is not safe to
6470                  * overwrite either of them: this makes proc_dointvec_minmax
6471                  * usable.
6472                  */
6473                 if (!table[i].extra1 && !table[i].extra2) {
6474                         table[i].extra1 = idev; /* embedded; no ref */
6475                         table[i].extra2 = net;
6476                 }
6477         }
6478
6479         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6480
6481         p->sysctl_header = register_net_sysctl(net, path, table);
6482         if (!p->sysctl_header)
6483                 goto free;
6484
6485         if (!strcmp(dev_name, "all"))
6486                 ifindex = NETCONFA_IFINDEX_ALL;
6487         else if (!strcmp(dev_name, "default"))
6488                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6489         else
6490                 ifindex = idev->dev->ifindex;
6491         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6492                                      ifindex, p);
6493         return 0;
6494
6495 free:
6496         kfree(table);
6497 out:
6498         return -ENOBUFS;
6499 }
6500
6501 static void __addrconf_sysctl_unregister(struct net *net,
6502                                          struct ipv6_devconf *p, int ifindex)
6503 {
6504         struct ctl_table *table;
6505
6506         if (!p->sysctl_header)
6507                 return;
6508
6509         table = p->sysctl_header->ctl_table_arg;
6510         unregister_net_sysctl_table(p->sysctl_header);
6511         p->sysctl_header = NULL;
6512         kfree(table);
6513
6514         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6515 }
6516
6517 static int addrconf_sysctl_register(struct inet6_dev *idev)
6518 {
6519         int err;
6520
6521         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6522                 return -EINVAL;
6523
6524         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6525                                     &ndisc_ifinfo_sysctl_change);
6526         if (err)
6527                 return err;
6528         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6529                                          idev, &idev->cnf);
6530         if (err)
6531                 neigh_sysctl_unregister(idev->nd_parms);
6532
6533         return err;
6534 }
6535
6536 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6537 {
6538         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6539                                      idev->dev->ifindex);
6540         neigh_sysctl_unregister(idev->nd_parms);
6541 }
6542
6543
6544 #endif
6545
6546 static int __net_init addrconf_init_net(struct net *net)
6547 {
6548         int err = -ENOMEM;
6549         struct ipv6_devconf *all, *dflt;
6550
6551         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6552         if (!all)
6553                 goto err_alloc_all;
6554
6555         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6556         if (!dflt)
6557                 goto err_alloc_dflt;
6558
6559         /* these will be inherited by all namespaces */
6560         dflt->autoconf = ipv6_defaults.autoconf;
6561         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6562
6563         dflt->stable_secret.initialized = false;
6564         all->stable_secret.initialized = false;
6565
6566         net->ipv6.devconf_all = all;
6567         net->ipv6.devconf_dflt = dflt;
6568
6569 #ifdef CONFIG_SYSCTL
6570         err = __addrconf_sysctl_register(net, "all", NULL, all);
6571         if (err < 0)
6572                 goto err_reg_all;
6573
6574         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6575         if (err < 0)
6576                 goto err_reg_dflt;
6577 #endif
6578         return 0;
6579
6580 #ifdef CONFIG_SYSCTL
6581 err_reg_dflt:
6582         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6583 err_reg_all:
6584         kfree(dflt);
6585 #endif
6586 err_alloc_dflt:
6587         kfree(all);
6588 err_alloc_all:
6589         return err;
6590 }
6591
6592 static void __net_exit addrconf_exit_net(struct net *net)
6593 {
6594 #ifdef CONFIG_SYSCTL
6595         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6596                                      NETCONFA_IFINDEX_DEFAULT);
6597         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6598                                      NETCONFA_IFINDEX_ALL);
6599 #endif
6600         kfree(net->ipv6.devconf_dflt);
6601         kfree(net->ipv6.devconf_all);
6602 }
6603
6604 static struct pernet_operations addrconf_ops = {
6605         .init = addrconf_init_net,
6606         .exit = addrconf_exit_net,
6607         .async = true,
6608 };
6609
6610 static struct rtnl_af_ops inet6_ops __read_mostly = {
6611         .family           = AF_INET6,
6612         .fill_link_af     = inet6_fill_link_af,
6613         .get_link_af_size = inet6_get_link_af_size,
6614         .validate_link_af = inet6_validate_link_af,
6615         .set_link_af      = inet6_set_link_af,
6616 };
6617
6618 /*
6619  *      Init / cleanup code
6620  */
6621
6622 int __init addrconf_init(void)
6623 {
6624         struct inet6_dev *idev;
6625         int i, err;
6626
6627         err = ipv6_addr_label_init();
6628         if (err < 0) {
6629                 pr_crit("%s: cannot initialize default policy table: %d\n",
6630                         __func__, err);
6631                 goto out;
6632         }
6633
6634         err = register_pernet_subsys(&addrconf_ops);
6635         if (err < 0)
6636                 goto out_addrlabel;
6637
6638         addrconf_wq = create_workqueue("ipv6_addrconf");
6639         if (!addrconf_wq) {
6640                 err = -ENOMEM;
6641                 goto out_nowq;
6642         }
6643
6644         /* The addrconf netdev notifier requires that loopback_dev
6645          * has it's ipv6 private information allocated and setup
6646          * before it can bring up and give link-local addresses
6647          * to other devices which are up.
6648          *
6649          * Unfortunately, loopback_dev is not necessarily the first
6650          * entry in the global dev_base list of net devices.  In fact,
6651          * it is likely to be the very last entry on that list.
6652          * So this causes the notifier registry below to try and
6653          * give link-local addresses to all devices besides loopback_dev
6654          * first, then loopback_dev, which cases all the non-loopback_dev
6655          * devices to fail to get a link-local address.
6656          *
6657          * So, as a temporary fix, allocate the ipv6 structure for
6658          * loopback_dev first by hand.
6659          * Longer term, all of the dependencies ipv6 has upon the loopback
6660          * device and it being up should be removed.
6661          */
6662         rtnl_lock();
6663         idev = ipv6_add_dev(init_net.loopback_dev);
6664         rtnl_unlock();
6665         if (IS_ERR(idev)) {
6666                 err = PTR_ERR(idev);
6667                 goto errlo;
6668         }
6669
6670         ip6_route_init_special_entries();
6671
6672         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6673                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6674
6675         register_netdevice_notifier(&ipv6_dev_notf);
6676
6677         addrconf_verify();
6678
6679         rtnl_af_register(&inet6_ops);
6680
6681         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6682                                    NULL, inet6_dump_ifinfo, 0);
6683         if (err < 0)
6684                 goto errout;
6685
6686         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6687                                    inet6_rtm_newaddr, NULL, 0);
6688         if (err < 0)
6689                 goto errout;
6690         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6691                                    inet6_rtm_deladdr, NULL, 0);
6692         if (err < 0)
6693                 goto errout;
6694         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6695                                    inet6_rtm_getaddr, inet6_dump_ifaddr,
6696                                    RTNL_FLAG_DOIT_UNLOCKED);
6697         if (err < 0)
6698                 goto errout;
6699         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6700                                    NULL, inet6_dump_ifmcaddr, 0);
6701         if (err < 0)
6702                 goto errout;
6703         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6704                                    NULL, inet6_dump_ifacaddr, 0);
6705         if (err < 0)
6706                 goto errout;
6707         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6708                                    inet6_netconf_get_devconf,
6709                                    inet6_netconf_dump_devconf,
6710                                    RTNL_FLAG_DOIT_UNLOCKED);
6711         if (err < 0)
6712                 goto errout;
6713         err = ipv6_addr_label_rtnl_register();
6714         if (err < 0)
6715                 goto errout;
6716
6717         return 0;
6718 errout:
6719         rtnl_unregister_all(PF_INET6);
6720         rtnl_af_unregister(&inet6_ops);
6721         unregister_netdevice_notifier(&ipv6_dev_notf);
6722 errlo:
6723         destroy_workqueue(addrconf_wq);
6724 out_nowq:
6725         unregister_pernet_subsys(&addrconf_ops);
6726 out_addrlabel:
6727         ipv6_addr_label_cleanup();
6728 out:
6729         return err;
6730 }
6731
6732 void addrconf_cleanup(void)
6733 {
6734         struct net_device *dev;
6735         int i;
6736
6737         unregister_netdevice_notifier(&ipv6_dev_notf);
6738         unregister_pernet_subsys(&addrconf_ops);
6739         ipv6_addr_label_cleanup();
6740
6741         rtnl_af_unregister(&inet6_ops);
6742
6743         rtnl_lock();
6744
6745         /* clean dev list */
6746         for_each_netdev(&init_net, dev) {
6747                 if (__in6_dev_get(dev) == NULL)
6748                         continue;
6749                 addrconf_ifdown(dev, 1);
6750         }
6751         addrconf_ifdown(init_net.loopback_dev, 2);
6752
6753         /*
6754          *      Check hash table.
6755          */
6756         spin_lock_bh(&addrconf_hash_lock);
6757         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6758                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6759         spin_unlock_bh(&addrconf_hash_lock);
6760         cancel_delayed_work(&addr_chk_work);
6761         rtnl_unlock();
6762
6763         destroy_workqueue(addrconf_wq);
6764 }