net/ipv6/addrconf.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      IPv6 Address [auto]configuration
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <[email protected]>
   8  *      Alexey Kuznetsov        <[email protected]>
   9  */
  10
  11 /*
  12  *      Changes:
  13  *
  14  *      Janos Farkas                    :       delete timer on ifdown
  15  *      <[email protected]>
  16  *      Andi Kleen                      :       kill double kfree on module
  17  *                                              unload.
  18  *      Maciej W. Rozycki               :       FDDI support
  19  *      sekiya@USAGI                    :       Don't send too many RS
  20  *                                              packets.
  21  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  22  *                                              packets.
  23  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  24  *                                              address validation timer.
  25  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  26  *                                              support.
  27  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  28  *                                              address on a same interface.
  29  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  30  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  31  *                                              seq_file.
  32  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  33  *                                              selection; consider scope,
  34  *                                              status etc.
  35  */
  36
  37 #define pr_fmt(fmt) "IPv6: " fmt
  38
  39 #include <linux/errno.h>
  40 #include <linux/types.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched/signal.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/net.h>
  46 #include <linux/inet.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64 #include <linux/hash.h>
  65
  66 #include <net/ip_tunnels.h>
  67 #include <net/net_namespace.h>
  68 #include <net/sock.h>
  69 #include <net/snmp.h>
  70
  71 #include <net/6lowpan.h>
  72 #include <net/firewire.h>
  73 #include <net/ipv6.h>
  74 #include <net/protocol.h>
  75 #include <net/ndisc.h>
  76 #include <net/ip6_route.h>
  77 #include <net/addrconf.h>
  78 #include <net/tcp.h>
  79 #include <net/ip.h>
  80 #include <net/netlink.h>
  81 #include <net/pkt_sched.h>
  82 #include <net/l3mdev.h>
  83 #include <linux/if_tunnel.h>
  84 #include <linux/rtnetlink.h>
  85 #include <linux/netconf.h>
  86 #include <linux/random.h>
  87 #include <linux/uaccess.h>
  88 #include <asm/unaligned.h>
  89
  90 #include <linux/proc_fs.h>
  91 #include <linux/seq_file.h>
  92 #include <linux/export.h>
  93 #include <linux/ioam6.h>
  94
  95 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  96
  97 #define IPV6_MAX_STRLEN \
  98         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
  99
 100 static inline u32 cstamp_delta(unsigned long cstamp)
 101 {
 102         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 103 }
 104
 105 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 106 {
 107         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 108         u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
 109         do_div(tmp, 1000000);
 110         return (s32)tmp;
 111 }
 112
 113 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 114 {
 115         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 116         u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
 117         do_div(tmp, 1000000);
 118         if ((s32)tmp > mrt) {
 119                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 120                 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
 121                 do_div(tmp, 1000000);
 122         }
 123         return (s32)tmp;
 124 }
 125
 126 #ifdef CONFIG_SYSCTL
 127 static int addrconf_sysctl_register(struct inet6_dev *idev);
 128 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 129 #else
 130 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 131 {
 132         return 0;
 133 }
 134
 135 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 136 {
 137 }
 138 #endif
 139
 140 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
 141
 142 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 143 static int ipv6_count_addresses(const struct inet6_dev *idev);
 144 static int ipv6_generate_stable_address(struct in6_addr *addr,
 145                                         u8 dad_count,
 146                                         const struct inet6_dev *idev);
 147
 148 #define IN6_ADDR_HSIZE_SHIFT    8
 149 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
 150
 151 static void addrconf_verify(struct net *net);
 152 static void addrconf_verify_rtnl(struct net *net);
 153
 154 static struct workqueue_struct *addrconf_wq;
 155
 156 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 157 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 158
 159 static void addrconf_type_change(struct net_device *dev,
 160                                  unsigned long event);
 161 static int addrconf_ifdown(struct net_device *dev, bool unregister);
 162
 163 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 164                                                   int plen,
 165                                                   const struct net_device *dev,
 166                                                   u32 flags, u32 noflags,
 167                                                   bool no_gw);
 168
 169 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 170 static void addrconf_dad_work(struct work_struct *w);
 171 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
 172                                    bool send_na);
 173 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
 174 static void addrconf_rs_timer(struct timer_list *t);
 175 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 176 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 177
 178 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 179                                 struct prefix_info *pinfo);
 180
 181 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 182         .forwarding             = 0,
 183         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 184         .mtu6                   = IPV6_MIN_MTU,
 185         .accept_ra              = 1,
 186         .accept_redirects       = 1,
 187         .autoconf               = 1,
 188         .force_mld_version      = 0,
 189         .mldv1_unsolicited_report_interval = 10 * HZ,
 190         .mldv2_unsolicited_report_interval = HZ,
 191         .dad_transmits          = 1,
 192         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 193         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 194         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 195         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 196         .use_tempaddr           = 0,
 197         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 198         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 199         .regen_min_advance      = REGEN_MIN_ADVANCE,
 200         .regen_max_retry        = REGEN_MAX_RETRY,
 201         .max_desync_factor      = MAX_DESYNC_FACTOR,
 202         .max_addresses          = IPV6_MAX_ADDRESSES,
 203         .accept_ra_defrtr       = 1,
 204         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 205         .accept_ra_from_local   = 0,
 206         .accept_ra_min_hop_limit= 1,
 207         .accept_ra_min_lft      = 0,
 208         .accept_ra_pinfo        = 1,
 209 #ifdef CONFIG_IPV6_ROUTER_PREF
 210         .accept_ra_rtr_pref     = 1,
 211         .rtr_probe_interval     = 60 * HZ,
 212 #ifdef CONFIG_IPV6_ROUTE_INFO
 213         .accept_ra_rt_info_min_plen = 0,
 214         .accept_ra_rt_info_max_plen = 0,
 215 #endif
 216 #endif
 217         .proxy_ndp              = 0,
 218         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 219         .disable_ipv6           = 0,
 220         .accept_dad             = 0,
 221         .suppress_frag_ndisc    = 1,
 222         .accept_ra_mtu          = 1,
 223         .stable_secret          = {
 224                 .initialized = false,
 225         },
 226         .use_oif_addrs_only     = 0,
 227         .ignore_routes_with_linkdown = 0,
 228         .keep_addr_on_down      = 0,
 229         .seg6_enabled           = 0,
 230 #ifdef CONFIG_IPV6_SEG6_HMAC
 231         .seg6_require_hmac      = 0,
 232 #endif
 233         .enhanced_dad           = 1,
 234         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 235         .disable_policy         = 0,
 236         .rpl_seg_enabled        = 0,
 237         .ioam6_enabled          = 0,
 238         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 239         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 240         .ndisc_evict_nocarrier  = 1,
 241         .ra_honor_pio_life      = 0,
 242 };
 243
 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 245         .forwarding             = 0,
 246         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 247         .mtu6                   = IPV6_MIN_MTU,
 248         .accept_ra              = 1,
 249         .accept_redirects       = 1,
 250         .autoconf               = 1,
 251         .force_mld_version      = 0,
 252         .mldv1_unsolicited_report_interval = 10 * HZ,
 253         .mldv2_unsolicited_report_interval = HZ,
 254         .dad_transmits          = 1,
 255         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 256         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 257         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 258         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 259         .use_tempaddr           = 0,
 260         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 261         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 262         .regen_min_advance      = REGEN_MIN_ADVANCE,
 263         .regen_max_retry        = REGEN_MAX_RETRY,
 264         .max_desync_factor      = MAX_DESYNC_FACTOR,
 265         .max_addresses          = IPV6_MAX_ADDRESSES,
 266         .accept_ra_defrtr       = 1,
 267         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 268         .accept_ra_from_local   = 0,
 269         .accept_ra_min_hop_limit= 1,
 270         .accept_ra_min_lft      = 0,
 271         .accept_ra_pinfo        = 1,
 272 #ifdef CONFIG_IPV6_ROUTER_PREF
 273         .accept_ra_rtr_pref     = 1,
 274         .rtr_probe_interval     = 60 * HZ,
 275 #ifdef CONFIG_IPV6_ROUTE_INFO
 276         .accept_ra_rt_info_min_plen = 0,
 277         .accept_ra_rt_info_max_plen = 0,
 278 #endif
 279 #endif
 280         .proxy_ndp              = 0,
 281         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 282         .disable_ipv6           = 0,
 283         .accept_dad             = 1,
 284         .suppress_frag_ndisc    = 1,
 285         .accept_ra_mtu          = 1,
 286         .stable_secret          = {
 287                 .initialized = false,
 288         },
 289         .use_oif_addrs_only     = 0,
 290         .ignore_routes_with_linkdown = 0,
 291         .keep_addr_on_down      = 0,
 292         .seg6_enabled           = 0,
 293 #ifdef CONFIG_IPV6_SEG6_HMAC
 294         .seg6_require_hmac      = 0,
 295 #endif
 296         .enhanced_dad           = 1,
 297         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 298         .disable_policy         = 0,
 299         .rpl_seg_enabled        = 0,
 300         .ioam6_enabled          = 0,
 301         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 302         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 303         .ndisc_evict_nocarrier  = 1,
 304         .ra_honor_pio_life      = 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 (!mod_timer(&idev->rs_timer, jiffies + when))
 329                 in6_dev_hold(idev);
 330 }
 331
 332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 333                                    unsigned long delay)
 334 {
 335         in6_ifa_hold(ifp);
 336         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 337                 in6_ifa_put(ifp);
 338 }
 339
 340 static int snmp6_alloc_dev(struct inet6_dev *idev)
 341 {
 342         int i;
 343
 344         idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
 345         if (!idev->stats.ipv6)
 346                 goto err_ip;
 347
 348         for_each_possible_cpu(i) {
 349                 struct ipstats_mib *addrconf_stats;
 350                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 351                 u64_stats_init(&addrconf_stats->syncp);
 352         }
 353
 354
 355         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 356                                         GFP_KERNEL);
 357         if (!idev->stats.icmpv6dev)
 358                 goto err_icmp;
 359         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 360                                            GFP_KERNEL_ACCOUNT);
 361         if (!idev->stats.icmpv6msgdev)
 362                 goto err_icmpmsg;
 363
 364         return 0;
 365
 366 err_icmpmsg:
 367         kfree(idev->stats.icmpv6dev);
 368 err_icmp:
 369         free_percpu(idev->stats.ipv6);
 370 err_ip:
 371         return -ENOMEM;
 372 }
 373
 374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 375 {
 376         struct inet6_dev *ndev;
 377         int err = -ENOMEM;
 378
 379         ASSERT_RTNL();
 380
 381         if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
 382                 return ERR_PTR(-EINVAL);
 383
 384         ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
 385         if (!ndev)
 386                 return ERR_PTR(err);
 387
 388         rwlock_init(&ndev->lock);
 389         ndev->dev = dev;
 390         INIT_LIST_HEAD(&ndev->addr_list);
 391         timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
 392         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 393
 394         if (ndev->cnf.stable_secret.initialized)
 395                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 396
 397         ndev->cnf.mtu6 = dev->mtu;
 398         ndev->ra_mtu = 0;
 399         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 400         if (!ndev->nd_parms) {
 401                 kfree(ndev);
 402                 return ERR_PTR(err);
 403         }
 404         if (ndev->cnf.forwarding)
 405                 dev_disable_lro(dev);
 406         /* We refer to the device */
 407         netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
 408
 409         if (snmp6_alloc_dev(ndev) < 0) {
 410                 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
 411                            __func__);
 412                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 413                 netdev_put(dev, &ndev->dev_tracker);
 414                 kfree(ndev);
 415                 return ERR_PTR(err);
 416         }
 417
 418         if (dev != blackhole_netdev) {
 419                 if (snmp6_register_dev(ndev) < 0) {
 420                         netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
 421                                    __func__, dev->name);
 422                         goto err_release;
 423                 }
 424         }
 425         /* One reference from device. */
 426         refcount_set(&ndev->refcnt, 1);
 427
 428         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 429                 ndev->cnf.accept_dad = -1;
 430
 431 #if IS_ENABLED(CONFIG_IPV6_SIT)
 432         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 433                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 434                 ndev->cnf.rtr_solicits = 0;
 435         }
 436 #endif
 437
 438         INIT_LIST_HEAD(&ndev->tempaddr_list);
 439         ndev->desync_factor = U32_MAX;
 440         if ((dev->flags&IFF_LOOPBACK) ||
 441             dev->type == ARPHRD_TUNNEL ||
 442             dev->type == ARPHRD_TUNNEL6 ||
 443             dev->type == ARPHRD_SIT ||
 444             dev->type == ARPHRD_NONE) {
 445                 ndev->cnf.use_tempaddr = -1;
 446         }
 447
 448         ndev->token = in6addr_any;
 449
 450         if (netif_running(dev) && addrconf_link_ready(dev))
 451                 ndev->if_flags |= IF_READY;
 452
 453         ipv6_mc_init_dev(ndev);
 454         ndev->tstamp = jiffies;
 455         if (dev != blackhole_netdev) {
 456                 err = addrconf_sysctl_register(ndev);
 457                 if (err) {
 458                         ipv6_mc_destroy_dev(ndev);
 459                         snmp6_unregister_dev(ndev);
 460                         goto err_release;
 461                 }
 462         }
 463         /* protected by rtnl_lock */
 464         rcu_assign_pointer(dev->ip6_ptr, ndev);
 465
 466         if (dev != blackhole_netdev) {
 467                 /* Join interface-local all-node multicast group */
 468                 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 469
 470                 /* Join all-node multicast group */
 471                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 472
 473                 /* Join all-router multicast group if forwarding is set */
 474                 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 475                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 476         }
 477         return ndev;
 478
 479 err_release:
 480         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 481         ndev->dead = 1;
 482         in6_dev_finish_destroy(ndev);
 483         return ERR_PTR(err);
 484 }
 485
 486 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 487 {
 488         struct inet6_dev *idev;
 489
 490         ASSERT_RTNL();
 491
 492         idev = __in6_dev_get(dev);
 493         if (!idev) {
 494                 idev = ipv6_add_dev(dev);
 495                 if (IS_ERR(idev))
 496                         return idev;
 497         }
 498
 499         if (dev->flags&IFF_UP)
 500                 ipv6_mc_up(idev);
 501         return idev;
 502 }
 503
 504 static int inet6_netconf_msgsize_devconf(int type)
 505 {
 506         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 507                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 508         bool all = false;
 509
 510         if (type == NETCONFA_ALL)
 511                 all = true;
 512
 513         if (all || type == NETCONFA_FORWARDING)
 514                 size += nla_total_size(4);
 515 #ifdef CONFIG_IPV6_MROUTE
 516         if (all || type == NETCONFA_MC_FORWARDING)
 517                 size += nla_total_size(4);
 518 #endif
 519         if (all || type == NETCONFA_PROXY_NEIGH)
 520                 size += nla_total_size(4);
 521
 522         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 523                 size += nla_total_size(4);
 524
 525         return size;
 526 }
 527
 528 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 529                                       struct ipv6_devconf *devconf, u32 portid,
 530                                       u32 seq, int event, unsigned int flags,
 531                                       int type)
 532 {
 533         struct nlmsghdr  *nlh;
 534         struct netconfmsg *ncm;
 535         bool all = false;
 536
 537         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 538                         flags);
 539         if (!nlh)
 540                 return -EMSGSIZE;
 541
 542         if (type == NETCONFA_ALL)
 543                 all = true;
 544
 545         ncm = nlmsg_data(nlh);
 546         ncm->ncm_family = AF_INET6;
 547
 548         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 549                 goto nla_put_failure;
 550
 551         if (!devconf)
 552                 goto out;
 553
 554         if ((all || type == NETCONFA_FORWARDING) &&
 555             nla_put_s32(skb, NETCONFA_FORWARDING,
 556                         READ_ONCE(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                         atomic_read(&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,
 566                         READ_ONCE(devconf->proxy_ndp)) < 0)
 567                 goto nla_put_failure;
 568
 569         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 570             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 571                         READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0)
 572                 goto nla_put_failure;
 573
 574 out:
 575         nlmsg_end(skb, nlh);
 576         return 0;
 577
 578 nla_put_failure:
 579         nlmsg_cancel(skb, nlh);
 580         return -EMSGSIZE;
 581 }
 582
 583 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 584                                   int ifindex, struct ipv6_devconf *devconf)
 585 {
 586         struct sk_buff *skb;
 587         int err = -ENOBUFS;
 588
 589         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 590         if (!skb)
 591                 goto errout;
 592
 593         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 594                                          event, 0, type);
 595         if (err < 0) {
 596                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 597                 WARN_ON(err == -EMSGSIZE);
 598                 kfree_skb(skb);
 599                 goto errout;
 600         }
 601         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 602         return;
 603 errout:
 604         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 605 }
 606
 607 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 608         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 609         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 610         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 611         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 612 };
 613
 614 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
 615                                        const struct nlmsghdr *nlh,
 616                                        struct nlattr **tb,
 617                                        struct netlink_ext_ack *extack)
 618 {
 619         int i, err;
 620
 621         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
 622                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
 623                 return -EINVAL;
 624         }
 625
 626         if (!netlink_strict_get_check(skb))
 627                 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
 628                                               tb, NETCONFA_MAX,
 629                                               devconf_ipv6_policy, extack);
 630
 631         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
 632                                             tb, NETCONFA_MAX,
 633                                             devconf_ipv6_policy, extack);
 634         if (err)
 635                 return err;
 636
 637         for (i = 0; i <= NETCONFA_MAX; i++) {
 638                 if (!tb[i])
 639                         continue;
 640
 641                 switch (i) {
 642                 case NETCONFA_IFINDEX:
 643                         break;
 644                 default:
 645                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
 646                         return -EINVAL;
 647                 }
 648         }
 649
 650         return 0;
 651 }
 652
 653 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 654                                      struct nlmsghdr *nlh,
 655                                      struct netlink_ext_ack *extack)
 656 {
 657         struct net *net = sock_net(in_skb->sk);
 658         struct nlattr *tb[NETCONFA_MAX+1];
 659         struct inet6_dev *in6_dev = NULL;
 660         struct net_device *dev = NULL;
 661         struct sk_buff *skb;
 662         struct ipv6_devconf *devconf;
 663         int ifindex;
 664         int err;
 665
 666         err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
 667         if (err < 0)
 668                 return err;
 669
 670         if (!tb[NETCONFA_IFINDEX])
 671                 return -EINVAL;
 672
 673         err = -EINVAL;
 674         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 675         switch (ifindex) {
 676         case NETCONFA_IFINDEX_ALL:
 677                 devconf = net->ipv6.devconf_all;
 678                 break;
 679         case NETCONFA_IFINDEX_DEFAULT:
 680                 devconf = net->ipv6.devconf_dflt;
 681                 break;
 682         default:
 683                 dev = dev_get_by_index(net, ifindex);
 684                 if (!dev)
 685                         return -EINVAL;
 686                 in6_dev = in6_dev_get(dev);
 687                 if (!in6_dev)
 688                         goto errout;
 689                 devconf = &in6_dev->cnf;
 690                 break;
 691         }
 692
 693         err = -ENOBUFS;
 694         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
 695         if (!skb)
 696                 goto errout;
 697
 698         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 699                                          NETLINK_CB(in_skb).portid,
 700                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 701                                          NETCONFA_ALL);
 702         if (err < 0) {
 703                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 704                 WARN_ON(err == -EMSGSIZE);
 705                 kfree_skb(skb);
 706                 goto errout;
 707         }
 708         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 709 errout:
 710         if (in6_dev)
 711                 in6_dev_put(in6_dev);
 712         dev_put(dev);
 713         return err;
 714 }
 715
 716 /* Combine dev_addr_genid and dev_base_seq to detect changes.
 717  */
 718 static u32 inet6_base_seq(const struct net *net)
 719 {
 720         u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
 721                   READ_ONCE(net->dev_base_seq);
 722
 723         /* Must not return 0 (see nl_dump_check_consistent()).
 724          * Chose a value far away from 0.
 725          */
 726         if (!res)
 727                 res = 0x80000000;
 728         return res;
 729 }
 730
 731 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 732                                       struct netlink_callback *cb)
 733 {
 734         const struct nlmsghdr *nlh = cb->nlh;
 735         struct net *net = sock_net(skb->sk);
 736         struct {
 737                 unsigned long ifindex;
 738                 unsigned int all_default;
 739         } *ctx = (void *)cb->ctx;
 740         struct net_device *dev;
 741         struct inet6_dev *idev;
 742         int err = 0;
 743
 744         if (cb->strict_check) {
 745                 struct netlink_ext_ack *extack = cb->extack;
 746                 struct netconfmsg *ncm;
 747
 748                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
 749                         NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
 750                         return -EINVAL;
 751                 }
 752
 753                 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
 754                         NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
 755                         return -EINVAL;
 756                 }
 757         }
 758
 759         rcu_read_lock();
 760         for_each_netdev_dump(net, dev, ctx->ifindex) {
 761                 idev = __in6_dev_get(dev);
 762                 if (!idev)
 763                         continue;
 764                 err = inet6_netconf_fill_devconf(skb, dev->ifindex,
 765                                                  &idev->cnf,
 766                                                  NETLINK_CB(cb->skb).portid,
 767                                                  nlh->nlmsg_seq,
 768                                                  RTM_NEWNETCONF,
 769                                                  NLM_F_MULTI,
 770                                                  NETCONFA_ALL);
 771                 if (err < 0)
 772                         goto done;
 773         }
 774         if (ctx->all_default == 0) {
 775                 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 776                                                  net->ipv6.devconf_all,
 777                                                  NETLINK_CB(cb->skb).portid,
 778                                                  nlh->nlmsg_seq,
 779                                                  RTM_NEWNETCONF, NLM_F_MULTI,
 780                                                  NETCONFA_ALL);
 781                 if (err < 0)
 782                         goto done;
 783                 ctx->all_default++;
 784         }
 785         if (ctx->all_default == 1) {
 786                 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 787                                                  net->ipv6.devconf_dflt,
 788                                                  NETLINK_CB(cb->skb).portid,
 789                                                  nlh->nlmsg_seq,
 790                                                  RTM_NEWNETCONF, NLM_F_MULTI,
 791                                                  NETCONFA_ALL);
 792                 if (err < 0)
 793                         goto done;
 794                 ctx->all_default++;
 795         }
 796 done:
 797         rcu_read_unlock();
 798         return err;
 799 }
 800
 801 #ifdef CONFIG_SYSCTL
 802 static void dev_forward_change(struct inet6_dev *idev)
 803 {
 804         struct net_device *dev;
 805         struct inet6_ifaddr *ifa;
 806         LIST_HEAD(tmp_addr_list);
 807
 808         if (!idev)
 809                 return;
 810         dev = idev->dev;
 811         if (idev->cnf.forwarding)
 812                 dev_disable_lro(dev);
 813         if (dev->flags & IFF_MULTICAST) {
 814                 if (idev->cnf.forwarding) {
 815                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 816                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 817                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 818                 } else {
 819                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 820                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 821                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 822                 }
 823         }
 824
 825         read_lock_bh(&idev->lock);
 826         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 827                 if (ifa->flags&IFA_F_TENTATIVE)
 828                         continue;
 829                 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
 830         }
 831         read_unlock_bh(&idev->lock);
 832
 833         while (!list_empty(&tmp_addr_list)) {
 834                 ifa = list_first_entry(&tmp_addr_list,
 835                                        struct inet6_ifaddr, if_list_aux);
 836                 list_del(&ifa->if_list_aux);
 837                 if (idev->cnf.forwarding)
 838                         addrconf_join_anycast(ifa);
 839                 else
 840                         addrconf_leave_anycast(ifa);
 841         }
 842
 843         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 844                                      NETCONFA_FORWARDING,
 845                                      dev->ifindex, &idev->cnf);
 846 }
 847
 848
 849 static void addrconf_forward_change(struct net *net, __s32 newf)
 850 {
 851         struct net_device *dev;
 852         struct inet6_dev *idev;
 853
 854         for_each_netdev(net, dev) {
 855                 idev = __in6_dev_get(dev);
 856                 if (idev) {
 857                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 858
 859                         WRITE_ONCE(idev->cnf.forwarding, newf);
 860                         if (changed)
 861                                 dev_forward_change(idev);
 862                 }
 863         }
 864 }
 865
 866 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 867 {
 868         struct net *net;
 869         int old;
 870
 871         if (!rtnl_trylock())
 872                 return restart_syscall();
 873
 874         net = (struct net *)table->extra2;
 875         old = *p;
 876         WRITE_ONCE(*p, newf);
 877
 878         if (p == &net->ipv6.devconf_dflt->forwarding) {
 879                 if ((!newf) ^ (!old))
 880                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 881                                                      NETCONFA_FORWARDING,
 882                                                      NETCONFA_IFINDEX_DEFAULT,
 883                                                      net->ipv6.devconf_dflt);
 884                 rtnl_unlock();
 885                 return 0;
 886         }
 887
 888         if (p == &net->ipv6.devconf_all->forwarding) {
 889                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 890
 891                 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf);
 892                 if ((!newf) ^ (!old_dflt))
 893                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 894                                                      NETCONFA_FORWARDING,
 895                                                      NETCONFA_IFINDEX_DEFAULT,
 896                                                      net->ipv6.devconf_dflt);
 897
 898                 addrconf_forward_change(net, newf);
 899                 if ((!newf) ^ (!old))
 900                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 901                                                      NETCONFA_FORWARDING,
 902                                                      NETCONFA_IFINDEX_ALL,
 903                                                      net->ipv6.devconf_all);
 904         } else if ((!newf) ^ (!old))
 905                 dev_forward_change((struct inet6_dev *)table->extra1);
 906         rtnl_unlock();
 907
 908         if (newf)
 909                 rt6_purge_dflt_routers(net);
 910         return 1;
 911 }
 912
 913 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 914 {
 915         struct net_device *dev;
 916         struct inet6_dev *idev;
 917
 918         for_each_netdev(net, dev) {
 919                 idev = __in6_dev_get(dev);
 920                 if (idev) {
 921                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 922
 923                         WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf);
 924                         if (changed)
 925                                 inet6_netconf_notify_devconf(dev_net(dev),
 926                                                              RTM_NEWNETCONF,
 927                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 928                                                              dev->ifindex,
 929                                                              &idev->cnf);
 930                 }
 931         }
 932 }
 933
 934 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 935 {
 936         struct net *net;
 937         int old;
 938
 939         if (!rtnl_trylock())
 940                 return restart_syscall();
 941
 942         net = (struct net *)table->extra2;
 943         old = *p;
 944         WRITE_ONCE(*p, newf);
 945
 946         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 947                 if ((!newf) ^ (!old))
 948                         inet6_netconf_notify_devconf(net,
 949                                                      RTM_NEWNETCONF,
 950                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 951                                                      NETCONFA_IFINDEX_DEFAULT,
 952                                                      net->ipv6.devconf_dflt);
 953                 rtnl_unlock();
 954                 return 0;
 955         }
 956
 957         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 958                 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf);
 959                 addrconf_linkdown_change(net, newf);
 960                 if ((!newf) ^ (!old))
 961                         inet6_netconf_notify_devconf(net,
 962                                                      RTM_NEWNETCONF,
 963                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 964                                                      NETCONFA_IFINDEX_ALL,
 965                                                      net->ipv6.devconf_all);
 966         }
 967         rtnl_unlock();
 968
 969         return 1;
 970 }
 971
 972 #endif
 973
 974 /* Nobody refers to this ifaddr, destroy it */
 975 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 976 {
 977         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 978
 979 #ifdef NET_REFCNT_DEBUG
 980         pr_debug("%s\n", __func__);
 981 #endif
 982
 983         in6_dev_put(ifp->idev);
 984
 985         if (cancel_delayed_work(&ifp->dad_work))
 986                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 987                           ifp);
 988
 989         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 990                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 991                 return;
 992         }
 993
 994         kfree_rcu(ifp, rcu);
 995 }
 996
 997 static void
 998 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 999 {
1000         struct list_head *p;
1001         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1002
1003         /*
1004          * Each device address list is sorted in order of scope -
1005          * global before linklocal.
1006          */
1007         list_for_each(p, &idev->addr_list) {
1008                 struct inet6_ifaddr *ifa
1009                         = list_entry(p, struct inet6_ifaddr, if_list);
1010                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1011                         break;
1012         }
1013
1014         list_add_tail_rcu(&ifp->if_list, p);
1015 }
1016
1017 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1018 {
1019         u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1020
1021         return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1022 }
1023
1024 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1025                                struct net_device *dev, unsigned int hash)
1026 {
1027         struct inet6_ifaddr *ifp;
1028
1029         hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1030                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1031                         if (!dev || ifp->idev->dev == dev)
1032                                 return true;
1033                 }
1034         }
1035         return false;
1036 }
1037
1038 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1039 {
1040         struct net *net = dev_net(dev);
1041         unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1042         int err = 0;
1043
1044         spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1045
1046         /* Ignore adding duplicate addresses on an interface */
1047         if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1048                 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1049                 err = -EEXIST;
1050         } else {
1051                 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1052         }
1053
1054         spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1055
1056         return err;
1057 }
1058
1059 /* On success it returns ifp with increased reference count */
1060
1061 static struct inet6_ifaddr *
1062 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1063               bool can_block, struct netlink_ext_ack *extack)
1064 {
1065         gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1066         int addr_type = ipv6_addr_type(cfg->pfx);
1067         struct net *net = dev_net(idev->dev);
1068         struct inet6_ifaddr *ifa = NULL;
1069         struct fib6_info *f6i = NULL;
1070         int err = 0;
1071
1072         if (addr_type == IPV6_ADDR_ANY) {
1073                 NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1074                 return ERR_PTR(-EADDRNOTAVAIL);
1075         } else if (addr_type & IPV6_ADDR_MULTICAST &&
1076                    !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1077                 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1078                 return ERR_PTR(-EADDRNOTAVAIL);
1079         } else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1080                    !netif_is_l3_master(idev->dev) &&
1081                    addr_type & IPV6_ADDR_LOOPBACK) {
1082                 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1083                 return ERR_PTR(-EADDRNOTAVAIL);
1084         }
1085
1086         if (idev->dead) {
1087                 NL_SET_ERR_MSG_MOD(extack, "device is going away");
1088                 err = -ENODEV;
1089                 goto out;
1090         }
1091
1092         if (idev->cnf.disable_ipv6) {
1093                 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1094                 err = -EACCES;
1095                 goto out;
1096         }
1097
1098         /* validator notifier needs to be blocking;
1099          * do not call in atomic context
1100          */
1101         if (can_block) {
1102                 struct in6_validator_info i6vi = {
1103                         .i6vi_addr = *cfg->pfx,
1104                         .i6vi_dev = idev,
1105                         .extack = extack,
1106                 };
1107
1108                 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1109                 err = notifier_to_errno(err);
1110                 if (err < 0)
1111                         goto out;
1112         }
1113
1114         ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1115         if (!ifa) {
1116                 err = -ENOBUFS;
1117                 goto out;
1118         }
1119
1120         f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
1121         if (IS_ERR(f6i)) {
1122                 err = PTR_ERR(f6i);
1123                 f6i = NULL;
1124                 goto out;
1125         }
1126
1127         neigh_parms_data_state_setall(idev->nd_parms);
1128
1129         ifa->addr = *cfg->pfx;
1130         if (cfg->peer_pfx)
1131                 ifa->peer_addr = *cfg->peer_pfx;
1132
1133         spin_lock_init(&ifa->lock);
1134         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1135         INIT_HLIST_NODE(&ifa->addr_lst);
1136         ifa->scope = cfg->scope;
1137         ifa->prefix_len = cfg->plen;
1138         ifa->rt_priority = cfg->rt_priority;
1139         ifa->flags = cfg->ifa_flags;
1140         ifa->ifa_proto = cfg->ifa_proto;
1141         /* No need to add the TENTATIVE flag for addresses with NODAD */
1142         if (!(cfg->ifa_flags & IFA_F_NODAD))
1143                 ifa->flags |= IFA_F_TENTATIVE;
1144         ifa->valid_lft = cfg->valid_lft;
1145         ifa->prefered_lft = cfg->preferred_lft;
1146         ifa->cstamp = ifa->tstamp = jiffies;
1147         ifa->tokenized = false;
1148
1149         ifa->rt = f6i;
1150
1151         ifa->idev = idev;
1152         in6_dev_hold(idev);
1153
1154         /* For caller */
1155         refcount_set(&ifa->refcnt, 1);
1156
1157         rcu_read_lock();
1158
1159         err = ipv6_add_addr_hash(idev->dev, ifa);
1160         if (err < 0) {
1161                 rcu_read_unlock();
1162                 goto out;
1163         }
1164
1165         write_lock_bh(&idev->lock);
1166
1167         /* Add to inet6_dev unicast addr list. */
1168         ipv6_link_dev_addr(idev, ifa);
1169
1170         if (ifa->flags&IFA_F_TEMPORARY) {
1171                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1172                 in6_ifa_hold(ifa);
1173         }
1174
1175         in6_ifa_hold(ifa);
1176         write_unlock_bh(&idev->lock);
1177
1178         rcu_read_unlock();
1179
1180         inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1181 out:
1182         if (unlikely(err < 0)) {
1183                 fib6_info_release(f6i);
1184
1185                 if (ifa) {
1186                         if (ifa->idev)
1187                                 in6_dev_put(ifa->idev);
1188                         kfree(ifa);
1189                 }
1190                 ifa = ERR_PTR(err);
1191         }
1192
1193         return ifa;
1194 }
1195
1196 enum cleanup_prefix_rt_t {
1197         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1198         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1199         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1200 };
1201
1202 /*
1203  * Check, whether the prefix for ifp would still need a prefix route
1204  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1205  * constants.
1206  *
1207  * 1) we don't purge prefix if address was not permanent.
1208  *    prefix is managed by its own lifetime.
1209  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1210  * 3) if there are no addresses, delete prefix.
1211  * 4) if there are still other permanent address(es),
1212  *    corresponding prefix is still permanent.
1213  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1214  *    don't purge the prefix, assume user space is managing it.
1215  * 6) otherwise, update prefix lifetime to the
1216  *    longest valid lifetime among the corresponding
1217  *    addresses on the device.
1218  *    Note: subsequent RA will update lifetime.
1219  **/
1220 static enum cleanup_prefix_rt_t
1221 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1222 {
1223         struct inet6_ifaddr *ifa;
1224         struct inet6_dev *idev = ifp->idev;
1225         unsigned long lifetime;
1226         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1227
1228         *expires = jiffies;
1229
1230         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1231                 if (ifa == ifp)
1232                         continue;
1233                 if (ifa->prefix_len != ifp->prefix_len ||
1234                     !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1235                                        ifp->prefix_len))
1236                         continue;
1237                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1238                         return CLEANUP_PREFIX_RT_NOP;
1239
1240                 action = CLEANUP_PREFIX_RT_EXPIRE;
1241
1242                 spin_lock(&ifa->lock);
1243
1244                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1245                 /*
1246                  * Note: Because this address is
1247                  * not permanent, lifetime <
1248                  * LONG_MAX / HZ here.
1249                  */
1250                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1251                         *expires = ifa->tstamp + lifetime * HZ;
1252                 spin_unlock(&ifa->lock);
1253         }
1254
1255         return action;
1256 }
1257
1258 static void
1259 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1260                      bool del_rt, bool del_peer)
1261 {
1262         struct fib6_table *table;
1263         struct fib6_info *f6i;
1264
1265         f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1266                                         ifp->prefix_len,
1267                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
1268         if (f6i) {
1269                 if (del_rt)
1270                         ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1271                 else {
1272                         if (!(f6i->fib6_flags & RTF_EXPIRES)) {
1273                                 table = f6i->fib6_table;
1274                                 spin_lock_bh(&table->tb6_lock);
1275
1276                                 fib6_set_expires(f6i, expires);
1277                                 fib6_add_gc_list(f6i);
1278
1279                                 spin_unlock_bh(&table->tb6_lock);
1280                         }
1281                         fib6_info_release(f6i);
1282                 }
1283         }
1284 }
1285
1286
1287 /* This function wants to get referenced ifp and releases it before return */
1288
1289 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1290 {
1291         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1292         struct net *net = dev_net(ifp->idev->dev);
1293         unsigned long expires;
1294         int state;
1295
1296         ASSERT_RTNL();
1297
1298         spin_lock_bh(&ifp->lock);
1299         state = ifp->state;
1300         ifp->state = INET6_IFADDR_STATE_DEAD;
1301         spin_unlock_bh(&ifp->lock);
1302
1303         if (state == INET6_IFADDR_STATE_DEAD)
1304                 goto out;
1305
1306         spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1307         hlist_del_init_rcu(&ifp->addr_lst);
1308         spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1309
1310         write_lock_bh(&ifp->idev->lock);
1311
1312         if (ifp->flags&IFA_F_TEMPORARY) {
1313                 list_del(&ifp->tmp_list);
1314                 if (ifp->ifpub) {
1315                         in6_ifa_put(ifp->ifpub);
1316                         ifp->ifpub = NULL;
1317                 }
1318                 __in6_ifa_put(ifp);
1319         }
1320
1321         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1322                 action = check_cleanup_prefix_route(ifp, &expires);
1323
1324         list_del_rcu(&ifp->if_list);
1325         __in6_ifa_put(ifp);
1326
1327         write_unlock_bh(&ifp->idev->lock);
1328
1329         addrconf_del_dad_work(ifp);
1330
1331         ipv6_ifa_notify(RTM_DELADDR, ifp);
1332
1333         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1334
1335         if (action != CLEANUP_PREFIX_RT_NOP) {
1336                 cleanup_prefix_route(ifp, expires,
1337                         action == CLEANUP_PREFIX_RT_DEL, false);
1338         }
1339
1340         /* clean up prefsrc entries */
1341         rt6_remove_prefsrc(ifp);
1342 out:
1343         in6_ifa_put(ifp);
1344 }
1345
1346 static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev)
1347 {
1348         return READ_ONCE(idev->cnf.regen_min_advance) +
1349                 READ_ONCE(idev->cnf.regen_max_retry) *
1350                 READ_ONCE(idev->cnf.dad_transmits) *
1351                 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1352 }
1353
1354 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1355 {
1356         struct inet6_dev *idev = ifp->idev;
1357         unsigned long tmp_tstamp, age;
1358         unsigned long regen_advance;
1359         unsigned long now = jiffies;
1360         u32 if_public_preferred_lft;
1361         s32 cnf_temp_preferred_lft;
1362         struct inet6_ifaddr *ift;
1363         struct ifa6_config cfg;
1364         long max_desync_factor;
1365         struct in6_addr addr;
1366         int ret = 0;
1367
1368         write_lock_bh(&idev->lock);
1369
1370 retry:
1371         in6_dev_hold(idev);
1372         if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) {
1373                 write_unlock_bh(&idev->lock);
1374                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1375                 in6_dev_put(idev);
1376                 ret = -1;
1377                 goto out;
1378         }
1379         spin_lock_bh(&ifp->lock);
1380         if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) {
1381                 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/
1382                 spin_unlock_bh(&ifp->lock);
1383                 write_unlock_bh(&idev->lock);
1384                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1385                         __func__);
1386                 in6_dev_put(idev);
1387                 ret = -1;
1388                 goto out;
1389         }
1390         in6_ifa_hold(ifp);
1391         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1392         ipv6_gen_rnd_iid(&addr);
1393
1394         age = (now - ifp->tstamp) / HZ;
1395
1396         regen_advance = ipv6_get_regen_advance(idev);
1397
1398         /* recalculate max_desync_factor each time and update
1399          * idev->desync_factor if it's larger
1400          */
1401         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1402         max_desync_factor = min_t(long,
1403                                   READ_ONCE(idev->cnf.max_desync_factor),
1404                                   cnf_temp_preferred_lft - regen_advance);
1405
1406         if (unlikely(idev->desync_factor > max_desync_factor)) {
1407                 if (max_desync_factor > 0) {
1408                         get_random_bytes(&idev->desync_factor,
1409                                          sizeof(idev->desync_factor));
1410                         idev->desync_factor %= max_desync_factor;
1411                 } else {
1412                         idev->desync_factor = 0;
1413                 }
1414         }
1415
1416         if_public_preferred_lft = ifp->prefered_lft;
1417
1418         memset(&cfg, 0, sizeof(cfg));
1419         cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1420                               READ_ONCE(idev->cnf.temp_valid_lft) + age);
1421         cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1422         cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft);
1423         cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft);
1424
1425         cfg.plen = ifp->prefix_len;
1426         tmp_tstamp = ifp->tstamp;
1427         spin_unlock_bh(&ifp->lock);
1428
1429         write_unlock_bh(&idev->lock);
1430
1431         /* From RFC 4941:
1432          *
1433          *     A temporary address is created only if this calculated Preferred
1434          *     Lifetime is greater than REGEN_ADVANCE time units.  In
1435          *     particular, an implementation must not create a temporary address
1436          *     with a zero Preferred Lifetime.
1437          *
1438          *     ...
1439          *
1440          *     When creating a temporary address, the lifetime values MUST be
1441          *     derived from the corresponding prefix as follows:
1442          *
1443          *     ...
1444          *
1445          *     *  Its Preferred Lifetime is the lower of the Preferred Lifetime
1446          *        of the public address or TEMP_PREFERRED_LIFETIME -
1447          *        DESYNC_FACTOR.
1448          *
1449          * To comply with the RFC's requirements, clamp the preferred lifetime
1450          * to a minimum of regen_advance, unless that would exceed valid_lft or
1451          * ifp->prefered_lft.
1452          *
1453          * Use age calculation as in addrconf_verify to avoid unnecessary
1454          * temporary addresses being generated.
1455          */
1456         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1457         if (cfg.preferred_lft <= regen_advance + age) {
1458                 cfg.preferred_lft = regen_advance + age + 1;
1459                 if (cfg.preferred_lft > cfg.valid_lft ||
1460                     cfg.preferred_lft > if_public_preferred_lft) {
1461                         in6_ifa_put(ifp);
1462                         in6_dev_put(idev);
1463                         ret = -1;
1464                         goto out;
1465                 }
1466         }
1467
1468         cfg.ifa_flags = IFA_F_TEMPORARY;
1469         /* set in addrconf_prefix_rcv() */
1470         if (ifp->flags & IFA_F_OPTIMISTIC)
1471                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1472
1473         cfg.pfx = &addr;
1474         cfg.scope = ipv6_addr_scope(cfg.pfx);
1475
1476         ift = ipv6_add_addr(idev, &cfg, block, NULL);
1477         if (IS_ERR(ift)) {
1478                 in6_ifa_put(ifp);
1479                 in6_dev_put(idev);
1480                 pr_info("%s: retry temporary address regeneration\n", __func__);
1481                 write_lock_bh(&idev->lock);
1482                 goto retry;
1483         }
1484
1485         spin_lock_bh(&ift->lock);
1486         ift->ifpub = ifp;
1487         ift->cstamp = now;
1488         ift->tstamp = tmp_tstamp;
1489         spin_unlock_bh(&ift->lock);
1490
1491         addrconf_dad_start(ift);
1492         in6_ifa_put(ift);
1493         in6_dev_put(idev);
1494 out:
1495         return ret;
1496 }
1497
1498 /*
1499  *      Choose an appropriate source address (RFC3484)
1500  */
1501 enum {
1502         IPV6_SADDR_RULE_INIT = 0,
1503         IPV6_SADDR_RULE_LOCAL,
1504         IPV6_SADDR_RULE_SCOPE,
1505         IPV6_SADDR_RULE_PREFERRED,
1506 #ifdef CONFIG_IPV6_MIP6
1507         IPV6_SADDR_RULE_HOA,
1508 #endif
1509         IPV6_SADDR_RULE_OIF,
1510         IPV6_SADDR_RULE_LABEL,
1511         IPV6_SADDR_RULE_PRIVACY,
1512         IPV6_SADDR_RULE_ORCHID,
1513         IPV6_SADDR_RULE_PREFIX,
1514 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1515         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1516 #endif
1517         IPV6_SADDR_RULE_MAX
1518 };
1519
1520 struct ipv6_saddr_score {
1521         int                     rule;
1522         int                     addr_type;
1523         struct inet6_ifaddr     *ifa;
1524         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1525         int                     scopedist;
1526         int                     matchlen;
1527 };
1528
1529 struct ipv6_saddr_dst {
1530         const struct in6_addr *addr;
1531         int ifindex;
1532         int scope;
1533         int label;
1534         unsigned int prefs;
1535 };
1536
1537 static inline int ipv6_saddr_preferred(int type)
1538 {
1539         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1540                 return 1;
1541         return 0;
1542 }
1543
1544 static bool ipv6_use_optimistic_addr(const struct net *net,
1545                                      const struct inet6_dev *idev)
1546 {
1547 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1548         if (!idev)
1549                 return false;
1550         if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1551             !READ_ONCE(idev->cnf.optimistic_dad))
1552                 return false;
1553         if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) &&
1554             !READ_ONCE(idev->cnf.use_optimistic))
1555                 return false;
1556
1557         return true;
1558 #else
1559         return false;
1560 #endif
1561 }
1562
1563 static bool ipv6_allow_optimistic_dad(const struct net *net,
1564                                       const struct inet6_dev *idev)
1565 {
1566 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1567         if (!idev)
1568                 return false;
1569         if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1570             !READ_ONCE(idev->cnf.optimistic_dad))
1571                 return false;
1572
1573         return true;
1574 #else
1575         return false;
1576 #endif
1577 }
1578
1579 static int ipv6_get_saddr_eval(struct net *net,
1580                                struct ipv6_saddr_score *score,
1581                                struct ipv6_saddr_dst *dst,
1582                                int i)
1583 {
1584         int ret;
1585
1586         if (i <= score->rule) {
1587                 switch (i) {
1588                 case IPV6_SADDR_RULE_SCOPE:
1589                         ret = score->scopedist;
1590                         break;
1591                 case IPV6_SADDR_RULE_PREFIX:
1592                         ret = score->matchlen;
1593                         break;
1594                 default:
1595                         ret = !!test_bit(i, score->scorebits);
1596                 }
1597                 goto out;
1598         }
1599
1600         switch (i) {
1601         case IPV6_SADDR_RULE_INIT:
1602                 /* Rule 0: remember if hiscore is not ready yet */
1603                 ret = !!score->ifa;
1604                 break;
1605         case IPV6_SADDR_RULE_LOCAL:
1606                 /* Rule 1: Prefer same address */
1607                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1608                 break;
1609         case IPV6_SADDR_RULE_SCOPE:
1610                 /* Rule 2: Prefer appropriate scope
1611                  *
1612                  *      ret
1613                  *       ^
1614                  *    -1 |  d 15
1615                  *    ---+--+-+---> scope
1616                  *       |
1617                  *       |             d is scope of the destination.
1618                  *  B-d  |  \
1619                  *       |   \      <- smaller scope is better if
1620                  *  B-15 |    \        if scope is enough for destination.
1621                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1622                  * d-C-1 | /
1623                  *       |/         <- greater is better
1624                  *   -C  /             if scope is not enough for destination.
1625                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1626                  *
1627                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1628                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1629                  * Assume B = 0 and we get C > 29.
1630                  */
1631                 ret = __ipv6_addr_src_scope(score->addr_type);
1632                 if (ret >= dst->scope)
1633                         ret = -ret;
1634                 else
1635                         ret -= 128;     /* 30 is enough */
1636                 score->scopedist = ret;
1637                 break;
1638         case IPV6_SADDR_RULE_PREFERRED:
1639             {
1640                 /* Rule 3: Avoid deprecated and optimistic addresses */
1641                 u8 avoid = IFA_F_DEPRECATED;
1642
1643                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1644                         avoid |= IFA_F_OPTIMISTIC;
1645                 ret = ipv6_saddr_preferred(score->addr_type) ||
1646                       !(score->ifa->flags & avoid);
1647                 break;
1648             }
1649 #ifdef CONFIG_IPV6_MIP6
1650         case IPV6_SADDR_RULE_HOA:
1651             {
1652                 /* Rule 4: Prefer home address */
1653                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1654                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1655                 break;
1656             }
1657 #endif
1658         case IPV6_SADDR_RULE_OIF:
1659                 /* Rule 5: Prefer outgoing interface */
1660                 ret = (!dst->ifindex ||
1661                        dst->ifindex == score->ifa->idev->dev->ifindex);
1662                 break;
1663         case IPV6_SADDR_RULE_LABEL:
1664                 /* Rule 6: Prefer matching label */
1665                 ret = ipv6_addr_label(net,
1666                                       &score->ifa->addr, score->addr_type,
1667                                       score->ifa->idev->dev->ifindex) == dst->label;
1668                 break;
1669         case IPV6_SADDR_RULE_PRIVACY:
1670             {
1671                 /* Rule 7: Prefer public address
1672                  * Note: prefer temporary address if use_tempaddr >= 2
1673                  */
1674                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1675                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1676                                 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2;
1677                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1678                 break;
1679             }
1680         case IPV6_SADDR_RULE_ORCHID:
1681                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1682                  *          non-ORCHID vs non-ORCHID
1683                  */
1684                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1685                         ipv6_addr_orchid(dst->addr));
1686                 break;
1687         case IPV6_SADDR_RULE_PREFIX:
1688                 /* Rule 8: Use longest matching prefix */
1689                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1690                 if (ret > score->ifa->prefix_len)
1691                         ret = score->ifa->prefix_len;
1692                 score->matchlen = ret;
1693                 break;
1694 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1695         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1696                 /* Optimistic addresses still have lower precedence than other
1697                  * preferred addresses.
1698                  */
1699                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1700                 break;
1701 #endif
1702         default:
1703                 ret = 0;
1704         }
1705
1706         if (ret)
1707                 __set_bit(i, score->scorebits);
1708         score->rule = i;
1709 out:
1710         return ret;
1711 }
1712
1713 static int __ipv6_dev_get_saddr(struct net *net,
1714                                 struct ipv6_saddr_dst *dst,
1715                                 struct inet6_dev *idev,
1716                                 struct ipv6_saddr_score *scores,
1717                                 int hiscore_idx)
1718 {
1719         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1720
1721         list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1722                 int i;
1723
1724                 /*
1725                  * - Tentative Address (RFC2462 section 5.4)
1726                  *  - A tentative address is not considered
1727                  *    "assigned to an interface" in the traditional
1728                  *    sense, unless it is also flagged as optimistic.
1729                  * - Candidate Source Address (section 4)
1730                  *  - In any case, anycast addresses, multicast
1731                  *    addresses, and the unspecified address MUST
1732                  *    NOT be included in a candidate set.
1733                  */
1734                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1735                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1736                         continue;
1737
1738                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1739
1740                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1741                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1742                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1743                                             idev->dev->name);
1744                         continue;
1745                 }
1746
1747                 score->rule = -1;
1748                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1749
1750                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1751                         int minihiscore, miniscore;
1752
1753                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1754                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1755
1756                         if (minihiscore > miniscore) {
1757                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1758                                     score->scopedist > 0) {
1759                                         /*
1760                                          * special case:
1761                                          * each remaining entry
1762                                          * has too small (not enough)
1763                                          * scope, because ifa entries
1764                                          * are sorted by their scope
1765                                          * values.
1766                                          */
1767                                         goto out;
1768                                 }
1769                                 break;
1770                         } else if (minihiscore < miniscore) {
1771                                 swap(hiscore, score);
1772                                 hiscore_idx = 1 - hiscore_idx;
1773
1774                                 /* restore our iterator */
1775                                 score->ifa = hiscore->ifa;
1776
1777                                 break;
1778                         }
1779                 }
1780         }
1781 out:
1782         return hiscore_idx;
1783 }
1784
1785 static int ipv6_get_saddr_master(struct net *net,
1786                                  const struct net_device *dst_dev,
1787                                  const struct net_device *master,
1788                                  struct ipv6_saddr_dst *dst,
1789                                  struct ipv6_saddr_score *scores,
1790                                  int hiscore_idx)
1791 {
1792         struct inet6_dev *idev;
1793
1794         idev = __in6_dev_get(dst_dev);
1795         if (idev)
1796                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1797                                                    scores, hiscore_idx);
1798
1799         idev = __in6_dev_get(master);
1800         if (idev)
1801                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1802                                                    scores, hiscore_idx);
1803
1804         return hiscore_idx;
1805 }
1806
1807 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1808                        const struct in6_addr *daddr, unsigned int prefs,
1809                        struct in6_addr *saddr)
1810 {
1811         struct ipv6_saddr_score scores[2], *hiscore;
1812         struct ipv6_saddr_dst dst;
1813         struct inet6_dev *idev;
1814         struct net_device *dev;
1815         int dst_type;
1816         bool use_oif_addr = false;
1817         int hiscore_idx = 0;
1818         int ret = 0;
1819
1820         dst_type = __ipv6_addr_type(daddr);
1821         dst.addr = daddr;
1822         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1823         dst.scope = __ipv6_addr_src_scope(dst_type);
1824         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1825         dst.prefs = prefs;
1826
1827         scores[hiscore_idx].rule = -1;
1828         scores[hiscore_idx].ifa = NULL;
1829
1830         rcu_read_lock();
1831
1832         /* Candidate Source Address (section 4)
1833          *  - multicast and link-local destination address,
1834          *    the set of candidate source address MUST only
1835          *    include addresses assigned to interfaces
1836          *    belonging to the same link as the outgoing
1837          *    interface.
1838          * (- For site-local destination addresses, the
1839          *    set of candidate source addresses MUST only
1840          *    include addresses assigned to interfaces
1841          *    belonging to the same site as the outgoing
1842          *    interface.)
1843          *  - "It is RECOMMENDED that the candidate source addresses
1844          *    be the set of unicast addresses assigned to the
1845          *    interface that will be used to send to the destination
1846          *    (the 'outgoing' interface)." (RFC 6724)
1847          */
1848         if (dst_dev) {
1849                 idev = __in6_dev_get(dst_dev);
1850                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1851                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1852                     (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) {
1853                         use_oif_addr = true;
1854                 }
1855         }
1856
1857         if (use_oif_addr) {
1858                 if (idev)
1859                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1860         } else {
1861                 const struct net_device *master;
1862                 int master_idx = 0;
1863
1864                 /* if dst_dev exists and is enslaved to an L3 device, then
1865                  * prefer addresses from dst_dev and then the master over
1866                  * any other enslaved devices in the L3 domain.
1867                  */
1868                 master = l3mdev_master_dev_rcu(dst_dev);
1869                 if (master) {
1870                         master_idx = master->ifindex;
1871
1872                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1873                                                             master, &dst,
1874                                                             scores, hiscore_idx);
1875
1876                         if (scores[hiscore_idx].ifa)
1877                                 goto out;
1878                 }
1879
1880                 for_each_netdev_rcu(net, dev) {
1881                         /* only consider addresses on devices in the
1882                          * same L3 domain
1883                          */
1884                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1885                                 continue;
1886                         idev = __in6_dev_get(dev);
1887                         if (!idev)
1888                                 continue;
1889                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1890                 }
1891         }
1892
1893 out:
1894         hiscore = &scores[hiscore_idx];
1895         if (!hiscore->ifa)
1896                 ret = -EADDRNOTAVAIL;
1897         else
1898                 *saddr = hiscore->ifa->addr;
1899
1900         rcu_read_unlock();
1901         return ret;
1902 }
1903 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1904
1905 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1906                               u32 banned_flags)
1907 {
1908         struct inet6_ifaddr *ifp;
1909         int err = -EADDRNOTAVAIL;
1910
1911         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1912                 if (ifp->scope > IFA_LINK)
1913                         break;
1914                 if (ifp->scope == IFA_LINK &&
1915                     !(ifp->flags & banned_flags)) {
1916                         *addr = ifp->addr;
1917                         err = 0;
1918                         break;
1919                 }
1920         }
1921         return err;
1922 }
1923
1924 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1925                     u32 banned_flags)
1926 {
1927         struct inet6_dev *idev;
1928         int err = -EADDRNOTAVAIL;
1929
1930         rcu_read_lock();
1931         idev = __in6_dev_get(dev);
1932         if (idev) {
1933                 read_lock_bh(&idev->lock);
1934                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1935                 read_unlock_bh(&idev->lock);
1936         }
1937         rcu_read_unlock();
1938         return err;
1939 }
1940
1941 static int ipv6_count_addresses(const struct inet6_dev *idev)
1942 {
1943         const struct inet6_ifaddr *ifp;
1944         int cnt = 0;
1945
1946         rcu_read_lock();
1947         list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1948                 cnt++;
1949         rcu_read_unlock();
1950         return cnt;
1951 }
1952
1953 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1954                   const struct net_device *dev, int strict)
1955 {
1956         return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1957                                        strict, IFA_F_TENTATIVE);
1958 }
1959 EXPORT_SYMBOL(ipv6_chk_addr);
1960
1961 /* device argument is used to find the L3 domain of interest. If
1962  * skip_dev_check is set, then the ifp device is not checked against
1963  * the passed in dev argument. So the 2 cases for addresses checks are:
1964  *   1. does the address exist in the L3 domain that dev is part of
1965  *      (skip_dev_check = true), or
1966  *
1967  *   2. does the address exist on the specific device
1968  *      (skip_dev_check = false)
1969  */
1970 static struct net_device *
1971 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1972                           const struct net_device *dev, bool skip_dev_check,
1973                           int strict, u32 banned_flags)
1974 {
1975         unsigned int hash = inet6_addr_hash(net, addr);
1976         struct net_device *l3mdev, *ndev;
1977         struct inet6_ifaddr *ifp;
1978         u32 ifp_flags;
1979
1980         rcu_read_lock();
1981
1982         l3mdev = l3mdev_master_dev_rcu(dev);
1983         if (skip_dev_check)
1984                 dev = NULL;
1985
1986         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1987                 ndev = ifp->idev->dev;
1988
1989                 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1990                         continue;
1991
1992                 /* Decouple optimistic from tentative for evaluation here.
1993                  * Ban optimistic addresses explicitly, when required.
1994                  */
1995                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1996                             ? (ifp->flags&~IFA_F_TENTATIVE)
1997                             : ifp->flags;
1998                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1999                     !(ifp_flags&banned_flags) &&
2000                     (!dev || ndev == dev ||
2001                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
2002                         rcu_read_unlock();
2003                         return ndev;
2004                 }
2005         }
2006
2007         rcu_read_unlock();
2008         return NULL;
2009 }
2010
2011 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
2012                             const struct net_device *dev, bool skip_dev_check,
2013                             int strict, u32 banned_flags)
2014 {
2015         return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
2016                                          strict, banned_flags) ? 1 : 0;
2017 }
2018 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
2019
2020
2021 /* Compares an address/prefix_len with addresses on device @dev.
2022  * If one is found it returns true.
2023  */
2024 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
2025         const unsigned int prefix_len, struct net_device *dev)
2026 {
2027         const struct inet6_ifaddr *ifa;
2028         const struct inet6_dev *idev;
2029         bool ret = false;
2030
2031         rcu_read_lock();
2032         idev = __in6_dev_get(dev);
2033         if (idev) {
2034                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2035                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
2036                         if (ret)
2037                                 break;
2038                 }
2039         }
2040         rcu_read_unlock();
2041
2042         return ret;
2043 }
2044 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
2045
2046 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
2047 {
2048         const struct inet6_ifaddr *ifa;
2049         const struct inet6_dev *idev;
2050         int     onlink;
2051
2052         onlink = 0;
2053         rcu_read_lock();
2054         idev = __in6_dev_get(dev);
2055         if (idev) {
2056                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2057                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
2058                                                    ifa->prefix_len);
2059                         if (onlink)
2060                                 break;
2061                 }
2062         }
2063         rcu_read_unlock();
2064         return onlink;
2065 }
2066 EXPORT_SYMBOL(ipv6_chk_prefix);
2067
2068 /**
2069  * ipv6_dev_find - find the first device with a given source address.
2070  * @net: the net namespace
2071  * @addr: the source address
2072  * @dev: used to find the L3 domain of interest
2073  *
2074  * The caller should be protected by RCU, or RTNL.
2075  */
2076 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2077                                  struct net_device *dev)
2078 {
2079         return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2080                                          IFA_F_TENTATIVE);
2081 }
2082 EXPORT_SYMBOL(ipv6_dev_find);
2083
2084 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2085                                      struct net_device *dev, int strict)
2086 {
2087         unsigned int hash = inet6_addr_hash(net, addr);
2088         struct inet6_ifaddr *ifp, *result = NULL;
2089
2090         rcu_read_lock();
2091         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2092                 if (ipv6_addr_equal(&ifp->addr, addr)) {
2093                         if (!dev || ifp->idev->dev == dev ||
2094                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2095                                 if (in6_ifa_hold_safe(ifp)) {
2096                                         result = ifp;
2097                                         break;
2098                                 }
2099                         }
2100                 }
2101         }
2102         rcu_read_unlock();
2103
2104         return result;
2105 }
2106
2107 /* Gets referenced address, destroys ifaddr */
2108
2109 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2110 {
2111         if (dad_failed)
2112                 ifp->flags |= IFA_F_DADFAILED;
2113
2114         if (ifp->flags&IFA_F_TEMPORARY) {
2115                 struct inet6_ifaddr *ifpub;
2116                 spin_lock_bh(&ifp->lock);
2117                 ifpub = ifp->ifpub;
2118                 if (ifpub) {
2119                         in6_ifa_hold(ifpub);
2120                         spin_unlock_bh(&ifp->lock);
2121                         ipv6_create_tempaddr(ifpub, true);
2122                         in6_ifa_put(ifpub);
2123                 } else {
2124                         spin_unlock_bh(&ifp->lock);
2125                 }
2126                 ipv6_del_addr(ifp);
2127         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2128                 spin_lock_bh(&ifp->lock);
2129                 addrconf_del_dad_work(ifp);
2130                 ifp->flags |= IFA_F_TENTATIVE;
2131                 if (dad_failed)
2132                         ifp->flags &= ~IFA_F_OPTIMISTIC;
2133                 spin_unlock_bh(&ifp->lock);
2134                 if (dad_failed)
2135                         ipv6_ifa_notify(0, ifp);
2136                 in6_ifa_put(ifp);
2137         } else {
2138                 ipv6_del_addr(ifp);
2139         }
2140 }
2141
2142 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2143 {
2144         int err = -ENOENT;
2145
2146         spin_lock_bh(&ifp->lock);
2147         if (ifp->state == INET6_IFADDR_STATE_DAD) {
2148                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2149                 err = 0;
2150         }
2151         spin_unlock_bh(&ifp->lock);
2152
2153         return err;
2154 }
2155
2156 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2157 {
2158         struct inet6_dev *idev = ifp->idev;
2159         struct net *net = dev_net(idev->dev);
2160         int max_addresses;
2161
2162         if (addrconf_dad_end(ifp)) {
2163                 in6_ifa_put(ifp);
2164                 return;
2165         }
2166
2167         net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2168                              ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2169
2170         spin_lock_bh(&ifp->lock);
2171
2172         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2173                 struct in6_addr new_addr;
2174                 struct inet6_ifaddr *ifp2;
2175                 int retries = ifp->stable_privacy_retry + 1;
2176                 struct ifa6_config cfg = {
2177                         .pfx = &new_addr,
2178                         .plen = ifp->prefix_len,
2179                         .ifa_flags = ifp->flags,
2180                         .valid_lft = ifp->valid_lft,
2181                         .preferred_lft = ifp->prefered_lft,
2182                         .scope = ifp->scope,
2183                 };
2184
2185                 if (retries > net->ipv6.sysctl.idgen_retries) {
2186                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2187                                              ifp->idev->dev->name);
2188                         goto errdad;
2189                 }
2190
2191                 new_addr = ifp->addr;
2192                 if (ipv6_generate_stable_address(&new_addr, retries,
2193                                                  idev))
2194                         goto errdad;
2195
2196                 spin_unlock_bh(&ifp->lock);
2197
2198                 max_addresses = READ_ONCE(idev->cnf.max_addresses);
2199                 if (max_addresses &&
2200                     ipv6_count_addresses(idev) >= max_addresses)
2201                         goto lock_errdad;
2202
2203                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2204                                      ifp->idev->dev->name);
2205
2206                 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2207                 if (IS_ERR(ifp2))
2208                         goto lock_errdad;
2209
2210                 spin_lock_bh(&ifp2->lock);
2211                 ifp2->stable_privacy_retry = retries;
2212                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2213                 spin_unlock_bh(&ifp2->lock);
2214
2215                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2216                 in6_ifa_put(ifp2);
2217 lock_errdad:
2218                 spin_lock_bh(&ifp->lock);
2219         }
2220
2221 errdad:
2222         /* transition from _POSTDAD to _ERRDAD */
2223         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2224         spin_unlock_bh(&ifp->lock);
2225
2226         addrconf_mod_dad_work(ifp, 0);
2227         in6_ifa_put(ifp);
2228 }
2229
2230 /* Join to solicited addr multicast group.
2231  * caller must hold RTNL */
2232 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2233 {
2234         struct in6_addr maddr;
2235
2236         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2237                 return;
2238
2239         addrconf_addr_solict_mult(addr, &maddr);
2240         ipv6_dev_mc_inc(dev, &maddr);
2241 }
2242
2243 /* caller must hold RTNL */
2244 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2245 {
2246         struct in6_addr maddr;
2247
2248         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2249                 return;
2250
2251         addrconf_addr_solict_mult(addr, &maddr);
2252         __ipv6_dev_mc_dec(idev, &maddr);
2253 }
2254
2255 /* caller must hold RTNL */
2256 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2257 {
2258         struct in6_addr addr;
2259
2260         if (ifp->prefix_len >= 127) /* RFC 6164 */
2261                 return;
2262         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2263         if (ipv6_addr_any(&addr))
2264                 return;
2265         __ipv6_dev_ac_inc(ifp->idev, &addr);
2266 }
2267
2268 /* caller must hold RTNL */
2269 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2270 {
2271         struct in6_addr addr;
2272
2273         if (ifp->prefix_len >= 127) /* RFC 6164 */
2274                 return;
2275         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2276         if (ipv6_addr_any(&addr))
2277                 return;
2278         __ipv6_dev_ac_dec(ifp->idev, &addr);
2279 }
2280
2281 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2282 {
2283         switch (dev->addr_len) {
2284         case ETH_ALEN:
2285                 memcpy(eui, dev->dev_addr, 3);
2286                 eui[3] = 0xFF;
2287                 eui[4] = 0xFE;
2288                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2289                 break;
2290         case EUI64_ADDR_LEN:
2291                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2292                 eui[0] ^= 2;
2293                 break;
2294         default:
2295                 return -1;
2296         }
2297
2298         return 0;
2299 }
2300
2301 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2302 {
2303         const union fwnet_hwaddr *ha;
2304
2305         if (dev->addr_len != FWNET_ALEN)
2306                 return -1;
2307
2308         ha = (const union fwnet_hwaddr *)dev->dev_addr;
2309
2310         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2311         eui[0] ^= 2;
2312         return 0;
2313 }
2314
2315 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2316 {
2317         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2318         if (dev->addr_len != ARCNET_ALEN)
2319                 return -1;
2320         memset(eui, 0, 7);
2321         eui[7] = *(u8 *)dev->dev_addr;
2322         return 0;
2323 }
2324
2325 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2326 {
2327         if (dev->addr_len != INFINIBAND_ALEN)
2328                 return -1;
2329         memcpy(eui, dev->dev_addr + 12, 8);
2330         eui[0] |= 2;
2331         return 0;
2332 }
2333
2334 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2335 {
2336         if (addr == 0)
2337                 return -1;
2338         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2339                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2340                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2341                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2342                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2343                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2344         eui[1] = 0;
2345         eui[2] = 0x5E;
2346         eui[3] = 0xFE;
2347         memcpy(eui + 4, &addr, 4);
2348         return 0;
2349 }
2350
2351 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2352 {
2353         if (dev->priv_flags & IFF_ISATAP)
2354                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2355         return -1;
2356 }
2357
2358 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2359 {
2360         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2361 }
2362
2363 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2364 {
2365         memcpy(eui, dev->perm_addr, 3);
2366         memcpy(eui + 5, dev->perm_addr + 3, 3);
2367         eui[3] = 0xFF;
2368         eui[4] = 0xFE;
2369         eui[0] ^= 2;
2370         return 0;
2371 }
2372
2373 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2374 {
2375         switch (dev->type) {
2376         case ARPHRD_ETHER:
2377         case ARPHRD_FDDI:
2378                 return addrconf_ifid_eui48(eui, dev);
2379         case ARPHRD_ARCNET:
2380                 return addrconf_ifid_arcnet(eui, dev);
2381         case ARPHRD_INFINIBAND:
2382                 return addrconf_ifid_infiniband(eui, dev);
2383         case ARPHRD_SIT:
2384                 return addrconf_ifid_sit(eui, dev);
2385         case ARPHRD_IPGRE:
2386         case ARPHRD_TUNNEL:
2387                 return addrconf_ifid_gre(eui, dev);
2388         case ARPHRD_6LOWPAN:
2389                 return addrconf_ifid_6lowpan(eui, dev);
2390         case ARPHRD_IEEE1394:
2391                 return addrconf_ifid_ieee1394(eui, dev);
2392         case ARPHRD_TUNNEL6:
2393         case ARPHRD_IP6GRE:
2394         case ARPHRD_RAWIP:
2395                 return addrconf_ifid_ip6tnl(eui, dev);
2396         }
2397         return -1;
2398 }
2399
2400 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2401 {
2402         int err = -1;
2403         struct inet6_ifaddr *ifp;
2404
2405         read_lock_bh(&idev->lock);
2406         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2407                 if (ifp->scope > IFA_LINK)
2408                         break;
2409                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2410                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2411                         err = 0;
2412                         break;
2413                 }
2414         }
2415         read_unlock_bh(&idev->lock);
2416         return err;
2417 }
2418
2419 /* Generation of a randomized Interface Identifier
2420  * draft-ietf-6man-rfc4941bis, Section 3.3.1
2421  */
2422
2423 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2424 {
2425 regen:
2426         get_random_bytes(&addr->s6_addr[8], 8);
2427
2428         /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2429          * check if generated address is not inappropriate:
2430          *
2431          * - Reserved IPv6 Interface Identifiers
2432          * - XXX: already assigned to an address on the device
2433          */
2434
2435         /* Subnet-router anycast: 0000:0000:0000:0000 */
2436         if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2437                 goto regen;
2438
2439         /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2440          * Proxy Mobile IPv6:   0200:5EFF:FE00:5213
2441          * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2442          */
2443         if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2444             (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2445                 goto regen;
2446
2447         /* Reserved subnet anycast addresses */
2448         if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2449             ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2450                 goto regen;
2451 }
2452
2453 /*
2454  *      Add prefix route.
2455  */
2456
2457 static void
2458 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2459                       struct net_device *dev, unsigned long expires,
2460                       u32 flags, gfp_t gfp_flags)
2461 {
2462         struct fib6_config cfg = {
2463                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2464                 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2465                 .fc_ifindex = dev->ifindex,
2466                 .fc_expires = expires,
2467                 .fc_dst_len = plen,
2468                 .fc_flags = RTF_UP | flags,
2469                 .fc_nlinfo.nl_net = dev_net(dev),
2470                 .fc_protocol = RTPROT_KERNEL,
2471                 .fc_type = RTN_UNICAST,
2472         };
2473
2474         cfg.fc_dst = *pfx;
2475
2476         /* Prevent useless cloning on PtP SIT.
2477            This thing is done here expecting that the whole
2478            class of non-broadcast devices need not cloning.
2479          */
2480 #if IS_ENABLED(CONFIG_IPV6_SIT)
2481         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2482                 cfg.fc_flags |= RTF_NONEXTHOP;
2483 #endif
2484
2485         ip6_route_add(&cfg, gfp_flags, NULL);
2486 }
2487
2488
2489 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2490                                                   int plen,
2491                                                   const struct net_device *dev,
2492                                                   u32 flags, u32 noflags,
2493                                                   bool no_gw)
2494 {
2495         struct fib6_node *fn;
2496         struct fib6_info *rt = NULL;
2497         struct fib6_table *table;
2498         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2499
2500         table = fib6_get_table(dev_net(dev), tb_id);
2501         if (!table)
2502                 return NULL;
2503
2504         rcu_read_lock();
2505         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2506         if (!fn)
2507                 goto out;
2508
2509         for_each_fib6_node_rt_rcu(fn) {
2510                 /* prefix routes only use builtin fib6_nh */
2511                 if (rt->nh)
2512                         continue;
2513
2514                 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2515                         continue;
2516                 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2517                         continue;
2518                 if ((rt->fib6_flags & flags) != flags)
2519                         continue;
2520                 if ((rt->fib6_flags & noflags) != 0)
2521                         continue;
2522                 if (!fib6_info_hold_safe(rt))
2523                         continue;
2524                 break;
2525         }
2526 out:
2527         rcu_read_unlock();
2528         return rt;
2529 }
2530
2531
2532 /* Create "default" multicast route to the interface */
2533
2534 static void addrconf_add_mroute(struct net_device *dev)
2535 {
2536         struct fib6_config cfg = {
2537                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2538                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2539                 .fc_ifindex = dev->ifindex,
2540                 .fc_dst_len = 8,
2541                 .fc_flags = RTF_UP,
2542                 .fc_type = RTN_MULTICAST,
2543                 .fc_nlinfo.nl_net = dev_net(dev),
2544                 .fc_protocol = RTPROT_KERNEL,
2545         };
2546
2547         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2548
2549         ip6_route_add(&cfg, GFP_KERNEL, NULL);
2550 }
2551
2552 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2553 {
2554         struct inet6_dev *idev;
2555
2556         ASSERT_RTNL();
2557
2558         idev = ipv6_find_idev(dev);
2559         if (IS_ERR(idev))
2560                 return idev;
2561
2562         if (idev->cnf.disable_ipv6)
2563                 return ERR_PTR(-EACCES);
2564
2565         /* Add default multicast route */
2566         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2567                 addrconf_add_mroute(dev);
2568
2569         return idev;
2570 }
2571
2572 static void manage_tempaddrs(struct inet6_dev *idev,
2573                              struct inet6_ifaddr *ifp,
2574                              __u32 valid_lft, __u32 prefered_lft,
2575                              bool create, unsigned long now)
2576 {
2577         u32 flags;
2578         struct inet6_ifaddr *ift;
2579
2580         read_lock_bh(&idev->lock);
2581         /* update all temporary addresses in the list */
2582         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2583                 int age, max_valid, max_prefered;
2584
2585                 if (ifp != ift->ifpub)
2586                         continue;
2587
2588                 /* RFC 4941 section 3.3:
2589                  * If a received option will extend the lifetime of a public
2590                  * address, the lifetimes of temporary addresses should
2591                  * be extended, subject to the overall constraint that no
2592                  * temporary addresses should ever remain "valid" or "preferred"
2593                  * for a time longer than (TEMP_VALID_LIFETIME) or
2594                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2595                  */
2596                 age = (now - ift->cstamp) / HZ;
2597                 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age;
2598                 if (max_valid < 0)
2599                         max_valid = 0;
2600
2601                 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) -
2602                                idev->desync_factor - age;
2603                 if (max_prefered < 0)
2604                         max_prefered = 0;
2605
2606                 if (valid_lft > max_valid)
2607                         valid_lft = max_valid;
2608
2609                 if (prefered_lft > max_prefered)
2610                         prefered_lft = max_prefered;
2611
2612                 spin_lock(&ift->lock);
2613                 flags = ift->flags;
2614                 ift->valid_lft = valid_lft;
2615                 ift->prefered_lft = prefered_lft;
2616                 ift->tstamp = now;
2617                 if (prefered_lft > 0)
2618                         ift->flags &= ~IFA_F_DEPRECATED;
2619
2620                 spin_unlock(&ift->lock);
2621                 if (!(flags&IFA_F_TENTATIVE))
2622                         ipv6_ifa_notify(0, ift);
2623         }
2624
2625         /* Also create a temporary address if it's enabled but no temporary
2626          * address currently exists.
2627          * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2628          * as part of cleanup (ie. deleting the mngtmpaddr).
2629          * We don't want that to result in creating a new temporary ip address.
2630          */
2631         if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2632                 create = true;
2633
2634         if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) {
2635                 /* When a new public address is created as described
2636                  * in [ADDRCONF], also create a new temporary address.
2637                  */
2638                 read_unlock_bh(&idev->lock);
2639                 ipv6_create_tempaddr(ifp, false);
2640         } else {
2641                 read_unlock_bh(&idev->lock);
2642         }
2643 }
2644
2645 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2646 {
2647         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2648                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2649 }
2650
2651 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2652                                  const struct prefix_info *pinfo,
2653                                  struct inet6_dev *in6_dev,
2654                                  const struct in6_addr *addr, int addr_type,
2655                                  u32 addr_flags, bool sllao, bool tokenized,
2656                                  __u32 valid_lft, u32 prefered_lft)
2657 {
2658         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2659         int create = 0, update_lft = 0;
2660
2661         if (!ifp && valid_lft) {
2662                 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses);
2663                 struct ifa6_config cfg = {
2664                         .pfx = addr,
2665                         .plen = pinfo->prefix_len,
2666                         .ifa_flags = addr_flags,
2667                         .valid_lft = valid_lft,
2668                         .preferred_lft = prefered_lft,
2669                         .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2670                         .ifa_proto = IFAPROT_KERNEL_RA
2671                 };
2672
2673 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2674                 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) ||
2675                      READ_ONCE(in6_dev->cnf.optimistic_dad)) &&
2676                     !net->ipv6.devconf_all->forwarding && sllao)
2677                         cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2678 #endif
2679
2680                 /* Do not allow to create too much of autoconfigured
2681                  * addresses; this would be too easy way to crash kernel.
2682                  */
2683                 if (!max_addresses ||
2684                     ipv6_count_addresses(in6_dev) < max_addresses)
2685                         ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2686
2687                 if (IS_ERR_OR_NULL(ifp))
2688                         return -1;
2689
2690                 create = 1;
2691                 spin_lock_bh(&ifp->lock);
2692                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2693                 ifp->cstamp = jiffies;
2694                 ifp->tokenized = tokenized;
2695                 spin_unlock_bh(&ifp->lock);
2696                 addrconf_dad_start(ifp);
2697         }
2698
2699         if (ifp) {
2700                 u32 flags;
2701                 unsigned long now;
2702                 u32 stored_lft;
2703
2704                 /* update lifetime (RFC2462 5.5.3 e) */
2705                 spin_lock_bh(&ifp->lock);
2706                 now = jiffies;
2707                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2708                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2709                 else
2710                         stored_lft = 0;
2711
2712                 /* RFC4862 Section 5.5.3e:
2713                  * "Note that the preferred lifetime of the
2714                  *  corresponding address is always reset to
2715                  *  the Preferred Lifetime in the received
2716                  *  Prefix Information option, regardless of
2717                  *  whether the valid lifetime is also reset or
2718                  *  ignored."
2719                  *
2720                  * So we should always update prefered_lft here.
2721                  */
2722                 update_lft = !create && stored_lft;
2723
2724                 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) {
2725                         const u32 minimum_lft = min_t(u32,
2726                                 stored_lft, MIN_VALID_LIFETIME);
2727                         valid_lft = max(valid_lft, minimum_lft);
2728                 }
2729
2730                 if (update_lft) {
2731                         ifp->valid_lft = valid_lft;
2732                         ifp->prefered_lft = prefered_lft;
2733                         WRITE_ONCE(ifp->tstamp, now);
2734                         flags = ifp->flags;
2735                         ifp->flags &= ~IFA_F_DEPRECATED;
2736                         spin_unlock_bh(&ifp->lock);
2737
2738                         if (!(flags&IFA_F_TENTATIVE))
2739                                 ipv6_ifa_notify(0, ifp);
2740                 } else
2741                         spin_unlock_bh(&ifp->lock);
2742
2743                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2744                                  create, now);
2745
2746                 in6_ifa_put(ifp);
2747                 addrconf_verify(net);
2748         }
2749
2750         return 0;
2751 }
2752 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2753
2754 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2755 {
2756         struct prefix_info *pinfo;
2757         struct fib6_table *table;
2758         __u32 valid_lft;
2759         __u32 prefered_lft;
2760         int addr_type, err;
2761         u32 addr_flags = 0;
2762         struct inet6_dev *in6_dev;
2763         struct net *net = dev_net(dev);
2764
2765         pinfo = (struct prefix_info *) opt;
2766
2767         if (len < sizeof(struct prefix_info)) {
2768                 netdev_dbg(dev, "addrconf: prefix option too short\n");
2769                 return;
2770         }
2771
2772         /*
2773          *      Validation checks ([ADDRCONF], page 19)
2774          */
2775
2776         addr_type = ipv6_addr_type(&pinfo->prefix);
2777
2778         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2779                 return;
2780
2781         valid_lft = ntohl(pinfo->valid);
2782         prefered_lft = ntohl(pinfo->prefered);
2783
2784         if (prefered_lft > valid_lft) {
2785                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2786                 return;
2787         }
2788
2789         in6_dev = in6_dev_get(dev);
2790
2791         if (!in6_dev) {
2792                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2793                                     dev->name);
2794                 return;
2795         }
2796
2797         if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2798                 goto put;
2799
2800         /*
2801          *      Two things going on here:
2802          *      1) Add routes for on-link prefixes
2803          *      2) Configure prefixes with the auto flag set
2804          */
2805
2806         if (pinfo->onlink) {
2807                 struct fib6_info *rt;
2808                 unsigned long rt_expires;
2809
2810                 /* Avoid arithmetic overflow. Really, we could
2811                  * save rt_expires in seconds, likely valid_lft,
2812                  * but it would require division in fib gc, that it
2813                  * not good.
2814                  */
2815                 if (HZ > USER_HZ)
2816                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2817                 else
2818                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2819
2820                 if (addrconf_finite_timeout(rt_expires))
2821                         rt_expires *= HZ;
2822
2823                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2824                                                pinfo->prefix_len,
2825                                                dev,
2826                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2827                                                RTF_DEFAULT, true);
2828
2829                 if (rt) {
2830                         /* Autoconf prefix route */
2831                         if (valid_lft == 0) {
2832                                 ip6_del_rt(net, rt, false);
2833                                 rt = NULL;
2834                         } else {
2835                                 table = rt->fib6_table;
2836                                 spin_lock_bh(&table->tb6_lock);
2837
2838                                 if (addrconf_finite_timeout(rt_expires)) {
2839                                         /* not infinity */
2840                                         fib6_set_expires(rt, jiffies + rt_expires);
2841                                         fib6_add_gc_list(rt);
2842                                 } else {
2843                                         fib6_clean_expires(rt);
2844                                         fib6_remove_gc_list(rt);
2845                                 }
2846
2847                                 spin_unlock_bh(&table->tb6_lock);
2848                         }
2849                 } else if (valid_lft) {
2850                         clock_t expires = 0;
2851                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2852                         if (addrconf_finite_timeout(rt_expires)) {
2853                                 /* not infinity */
2854                                 flags |= RTF_EXPIRES;
2855                                 expires = jiffies_to_clock_t(rt_expires);
2856                         }
2857                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2858                                               0, dev, expires, flags,
2859                                               GFP_ATOMIC);
2860                 }
2861                 fib6_info_release(rt);
2862         }
2863
2864         /* Try to figure out our local address for this prefix */
2865
2866         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2867                 struct in6_addr addr;
2868                 bool tokenized = false, dev_addr_generated = false;
2869
2870                 if (pinfo->prefix_len == 64) {
2871                         memcpy(&addr, &pinfo->prefix, 8);
2872
2873                         if (!ipv6_addr_any(&in6_dev->token)) {
2874                                 read_lock_bh(&in6_dev->lock);
2875                                 memcpy(addr.s6_addr + 8,
2876                                        in6_dev->token.s6_addr + 8, 8);
2877                                 read_unlock_bh(&in6_dev->lock);
2878                                 tokenized = true;
2879                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2880                                    !ipv6_generate_stable_address(&addr, 0,
2881                                                                  in6_dev)) {
2882                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2883                                 goto ok;
2884                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2885                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2886                                 goto put;
2887                         } else {
2888                                 dev_addr_generated = true;
2889                         }
2890                         goto ok;
2891                 }
2892                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2893                                     pinfo->prefix_len);
2894                 goto put;
2895
2896 ok:
2897                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2898                                                    &addr, addr_type,
2899                                                    addr_flags, sllao,
2900                                                    tokenized, valid_lft,
2901                                                    prefered_lft);
2902                 if (err)
2903                         goto put;
2904
2905                 /* Ignore error case here because previous prefix add addr was
2906                  * successful which will be notified.
2907                  */
2908                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2909                                               addr_type, addr_flags, sllao,
2910                                               tokenized, valid_lft,
2911                                               prefered_lft,
2912                                               dev_addr_generated);
2913         }
2914         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2915 put:
2916         in6_dev_put(in6_dev);
2917 }
2918
2919 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2920                 struct in6_ifreq *ireq)
2921 {
2922         struct ip_tunnel_parm_kern p = { };
2923         int err;
2924
2925         if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2926                 return -EADDRNOTAVAIL;
2927
2928         p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2929         p.iph.version = 4;
2930         p.iph.ihl = 5;
2931         p.iph.protocol = IPPROTO_IPV6;
2932         p.iph.ttl = 64;
2933
2934         if (!dev->netdev_ops->ndo_tunnel_ctl)
2935                 return -EOPNOTSUPP;
2936         err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2937         if (err)
2938                 return err;
2939
2940         dev = __dev_get_by_name(net, p.name);
2941         if (!dev)
2942                 return -ENOBUFS;
2943         return dev_open(dev, NULL);
2944 }
2945
2946 /*
2947  *      Set destination address.
2948  *      Special case for SIT interfaces where we create a new "virtual"
2949  *      device.
2950  */
2951 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2952 {
2953         struct net_device *dev;
2954         struct in6_ifreq ireq;
2955         int err = -ENODEV;
2956
2957         if (!IS_ENABLED(CONFIG_IPV6_SIT))
2958                 return -ENODEV;
2959         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2960                 return -EFAULT;
2961
2962         rtnl_lock();
2963         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2964         if (dev && dev->type == ARPHRD_SIT)
2965                 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2966         rtnl_unlock();
2967         return err;
2968 }
2969
2970 static int ipv6_mc_config(struct sock *sk, bool join,
2971                           const struct in6_addr *addr, int ifindex)
2972 {
2973         int ret;
2974
2975         ASSERT_RTNL();
2976
2977         lock_sock(sk);
2978         if (join)
2979                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2980         else
2981                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2982         release_sock(sk);
2983
2984         return ret;
2985 }
2986
2987 /*
2988  *      Manual configuration of address on an interface
2989  */
2990 static int inet6_addr_add(struct net *net, int ifindex,
2991                           struct ifa6_config *cfg,
2992                           struct netlink_ext_ack *extack)
2993 {
2994         struct inet6_ifaddr *ifp;
2995         struct inet6_dev *idev;
2996         struct net_device *dev;
2997         unsigned long timeout;
2998         clock_t expires;
2999         u32 flags;
3000
3001         ASSERT_RTNL();
3002
3003         if (cfg->plen > 128) {
3004                 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3005                 return -EINVAL;
3006         }
3007
3008         /* check the lifetime */
3009         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
3010                 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
3011                 return -EINVAL;
3012         }
3013
3014         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
3015                 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
3016                 return -EINVAL;
3017         }
3018
3019         dev = __dev_get_by_index(net, ifindex);
3020         if (!dev)
3021                 return -ENODEV;
3022
3023         idev = addrconf_add_dev(dev);
3024         if (IS_ERR(idev)) {
3025                 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3026                 return PTR_ERR(idev);
3027         }
3028
3029         if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3030                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3031                                          true, cfg->pfx, ifindex);
3032
3033                 if (ret < 0) {
3034                         NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3035                         return ret;
3036                 }
3037         }
3038
3039         cfg->scope = ipv6_addr_scope(cfg->pfx);
3040
3041         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
3042         if (addrconf_finite_timeout(timeout)) {
3043                 expires = jiffies_to_clock_t(timeout * HZ);
3044                 cfg->valid_lft = timeout;
3045                 flags = RTF_EXPIRES;
3046         } else {
3047                 expires = 0;
3048                 flags = 0;
3049                 cfg->ifa_flags |= IFA_F_PERMANENT;
3050         }
3051
3052         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
3053         if (addrconf_finite_timeout(timeout)) {
3054                 if (timeout == 0)
3055                         cfg->ifa_flags |= IFA_F_DEPRECATED;
3056                 cfg->preferred_lft = timeout;
3057         }
3058
3059         ifp = ipv6_add_addr(idev, cfg, true, extack);
3060         if (!IS_ERR(ifp)) {
3061                 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3062                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3063                                               ifp->rt_priority, dev, expires,
3064                                               flags, GFP_KERNEL);
3065                 }
3066
3067                 /* Send a netlink notification if DAD is enabled and
3068                  * optimistic flag is not set
3069                  */
3070                 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3071                         ipv6_ifa_notify(0, ifp);
3072                 /*
3073                  * Note that section 3.1 of RFC 4429 indicates
3074                  * that the Optimistic flag should not be set for
3075                  * manually configured addresses
3076                  */
3077                 addrconf_dad_start(ifp);
3078                 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3079                         manage_tempaddrs(idev, ifp, cfg->valid_lft,
3080                                          cfg->preferred_lft, true, jiffies);
3081                 in6_ifa_put(ifp);
3082                 addrconf_verify_rtnl(net);
3083                 return 0;
3084         } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3085                 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3086                                cfg->pfx, ifindex);
3087         }
3088
3089         return PTR_ERR(ifp);
3090 }
3091
3092 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3093                           const struct in6_addr *pfx, unsigned int plen,
3094                           struct netlink_ext_ack *extack)
3095 {
3096         struct inet6_ifaddr *ifp;
3097         struct inet6_dev *idev;
3098         struct net_device *dev;
3099
3100         if (plen > 128) {
3101                 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3102                 return -EINVAL;
3103         }
3104
3105         dev = __dev_get_by_index(net, ifindex);
3106         if (!dev) {
3107                 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3108                 return -ENODEV;
3109         }
3110
3111         idev = __in6_dev_get(dev);
3112         if (!idev) {
3113                 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3114                 return -ENXIO;
3115         }
3116
3117         read_lock_bh(&idev->lock);
3118         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3119                 if (ifp->prefix_len == plen &&
3120                     ipv6_addr_equal(pfx, &ifp->addr)) {
3121                         in6_ifa_hold(ifp);
3122                         read_unlock_bh(&idev->lock);
3123
3124                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
3125                             (ifa_flags & IFA_F_MANAGETEMPADDR))
3126                                 manage_tempaddrs(idev, ifp, 0, 0, false,
3127                                                  jiffies);
3128                         ipv6_del_addr(ifp);
3129                         addrconf_verify_rtnl(net);
3130                         if (ipv6_addr_is_multicast(pfx)) {
3131                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3132                                                false, pfx, dev->ifindex);
3133                         }
3134                         return 0;
3135                 }
3136         }
3137         read_unlock_bh(&idev->lock);
3138
3139         NL_SET_ERR_MSG_MOD(extack, "address not found");
3140         return -EADDRNOTAVAIL;
3141 }
3142
3143
3144 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3145 {
3146         struct ifa6_config cfg = {
3147                 .ifa_flags = IFA_F_PERMANENT,
3148                 .preferred_lft = INFINITY_LIFE_TIME,
3149                 .valid_lft = INFINITY_LIFE_TIME,
3150         };
3151         struct in6_ifreq ireq;
3152         int err;
3153
3154         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3155                 return -EPERM;
3156
3157         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3158                 return -EFAULT;
3159
3160         cfg.pfx = &ireq.ifr6_addr;
3161         cfg.plen = ireq.ifr6_prefixlen;
3162
3163         rtnl_lock();
3164         err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3165         rtnl_unlock();
3166         return err;
3167 }
3168
3169 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3170 {
3171         struct in6_ifreq ireq;
3172         int err;
3173
3174         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3175                 return -EPERM;
3176
3177         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3178                 return -EFAULT;
3179
3180         rtnl_lock();
3181         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3182                              ireq.ifr6_prefixlen, NULL);
3183         rtnl_unlock();
3184         return err;
3185 }
3186
3187 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3188                      int plen, int scope, u8 proto)
3189 {
3190         struct inet6_ifaddr *ifp;
3191         struct ifa6_config cfg = {
3192                 .pfx = addr,
3193                 .plen = plen,
3194                 .ifa_flags = IFA_F_PERMANENT,
3195                 .valid_lft = INFINITY_LIFE_TIME,
3196                 .preferred_lft = INFINITY_LIFE_TIME,
3197                 .scope = scope,
3198                 .ifa_proto = proto
3199         };
3200
3201         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3202         if (!IS_ERR(ifp)) {
3203                 spin_lock_bh(&ifp->lock);
3204                 ifp->flags &= ~IFA_F_TENTATIVE;
3205                 spin_unlock_bh(&ifp->lock);
3206                 rt_genid_bump_ipv6(dev_net(idev->dev));
3207                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3208                 in6_ifa_put(ifp);
3209         }
3210 }
3211
3212 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3213 static void add_v4_addrs(struct inet6_dev *idev)
3214 {
3215         struct in6_addr addr;
3216         struct net_device *dev;
3217         struct net *net = dev_net(idev->dev);
3218         int scope, plen, offset = 0;
3219         u32 pflags = 0;
3220
3221         ASSERT_RTNL();
3222
3223         memset(&addr, 0, sizeof(struct in6_addr));
3224         /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3225         if (idev->dev->addr_len == sizeof(struct in6_addr))
3226                 offset = sizeof(struct in6_addr) - 4;
3227         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3228
3229         if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3230                 scope = IPV6_ADDR_COMPATv4;
3231                 plen = 96;
3232                 pflags |= RTF_NONEXTHOP;
3233         } else {
3234                 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3235                         return;
3236
3237                 addr.s6_addr32[0] = htonl(0xfe800000);
3238                 scope = IFA_LINK;
3239                 plen = 64;
3240         }
3241
3242         if (addr.s6_addr32[3]) {
3243                 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3244                 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3245                                       GFP_KERNEL);
3246                 return;
3247         }
3248
3249         for_each_netdev(net, dev) {
3250                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3251                 if (in_dev && (dev->flags & IFF_UP)) {
3252                         struct in_ifaddr *ifa;
3253                         int flag = scope;
3254
3255                         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3256                                 addr.s6_addr32[3] = ifa->ifa_local;
3257
3258                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3259                                         continue;
3260                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3261                                         if (idev->dev->flags&IFF_POINTOPOINT)
3262                                                 continue;
3263                                         flag |= IFA_HOST;
3264                                 }
3265
3266                                 add_addr(idev, &addr, plen, flag,
3267                                          IFAPROT_UNSPEC);
3268                                 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3269                                                       0, pflags, GFP_KERNEL);
3270                         }
3271                 }
3272         }
3273 }
3274 #endif
3275
3276 static void init_loopback(struct net_device *dev)
3277 {
3278         struct inet6_dev  *idev;
3279
3280         /* ::1 */
3281
3282         ASSERT_RTNL();
3283
3284         idev = ipv6_find_idev(dev);
3285         if (IS_ERR(idev)) {
3286                 pr_debug("%s: add_dev failed\n", __func__);
3287                 return;
3288         }
3289
3290         add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3291 }
3292
3293 void addrconf_add_linklocal(struct inet6_dev *idev,
3294                             const struct in6_addr *addr, u32 flags)
3295 {
3296         struct ifa6_config cfg = {
3297                 .pfx = addr,
3298                 .plen = 64,
3299                 .ifa_flags = flags | IFA_F_PERMANENT,
3300                 .valid_lft = INFINITY_LIFE_TIME,
3301                 .preferred_lft = INFINITY_LIFE_TIME,
3302                 .scope = IFA_LINK,
3303                 .ifa_proto = IFAPROT_KERNEL_LL
3304         };
3305         struct inet6_ifaddr *ifp;
3306
3307 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3308         if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) ||
3309              READ_ONCE(idev->cnf.optimistic_dad)) &&
3310             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3311                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3312 #endif
3313
3314         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3315         if (!IS_ERR(ifp)) {
3316                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3317                                       0, 0, GFP_ATOMIC);
3318                 addrconf_dad_start(ifp);
3319                 in6_ifa_put(ifp);
3320         }
3321 }
3322 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3323
3324 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3325 {
3326         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3327                 return true;
3328
3329         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3330             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3331                 return true;
3332
3333         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3334             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3335                 return true;
3336
3337         return false;
3338 }
3339
3340 static int ipv6_generate_stable_address(struct in6_addr *address,
3341                                         u8 dad_count,
3342                                         const struct inet6_dev *idev)
3343 {
3344         static DEFINE_SPINLOCK(lock);
3345         static __u32 digest[SHA1_DIGEST_WORDS];
3346         static __u32 workspace[SHA1_WORKSPACE_WORDS];
3347
3348         static union {
3349                 char __data[SHA1_BLOCK_SIZE];
3350                 struct {
3351                         struct in6_addr secret;
3352                         __be32 prefix[2];
3353                         unsigned char hwaddr[MAX_ADDR_LEN];
3354                         u8 dad_count;
3355                 } __packed;
3356         } data;
3357
3358         struct in6_addr secret;
3359         struct in6_addr temp;
3360         struct net *net = dev_net(idev->dev);
3361
3362         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3363
3364         if (idev->cnf.stable_secret.initialized)
3365                 secret = idev->cnf.stable_secret.secret;
3366         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3367                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3368         else
3369                 return -1;
3370
3371 retry:
3372         spin_lock_bh(&lock);
3373
3374         sha1_init(digest);
3375         memset(&data, 0, sizeof(data));
3376         memset(workspace, 0, sizeof(workspace));
3377         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3378         data.prefix[0] = address->s6_addr32[0];
3379         data.prefix[1] = address->s6_addr32[1];
3380         data.secret = secret;
3381         data.dad_count = dad_count;
3382
3383         sha1_transform(digest, data.__data, workspace);
3384
3385         temp = *address;
3386         temp.s6_addr32[2] = (__force __be32)digest[0];
3387         temp.s6_addr32[3] = (__force __be32)digest[1];
3388
3389         spin_unlock_bh(&lock);
3390
3391         if (ipv6_reserved_interfaceid(temp)) {
3392                 dad_count++;
3393                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3394                         return -1;
3395                 goto retry;
3396         }
3397
3398         *address = temp;
3399         return 0;
3400 }
3401
3402 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3403 {
3404         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3405
3406         if (s->initialized)
3407                 return;
3408         s = &idev->cnf.stable_secret;
3409         get_random_bytes(&s->secret, sizeof(s->secret));
3410         s->initialized = true;
3411 }
3412
3413 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3414 {
3415         struct in6_addr addr;
3416
3417         /* no link local addresses on L3 master devices */
3418         if (netif_is_l3_master(idev->dev))
3419                 return;
3420
3421         /* no link local addresses on devices flagged as slaves */
3422         if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3423                 return;
3424
3425         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3426
3427         switch (idev->cnf.addr_gen_mode) {
3428         case IN6_ADDR_GEN_MODE_RANDOM:
3429                 ipv6_gen_mode_random_init(idev);
3430                 fallthrough;
3431         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3432                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3433                         addrconf_add_linklocal(idev, &addr,
3434                                                IFA_F_STABLE_PRIVACY);
3435                 else if (prefix_route)
3436                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3437                                               0, 0, GFP_KERNEL);
3438                 break;
3439         case IN6_ADDR_GEN_MODE_EUI64:
3440                 /* addrconf_add_linklocal also adds a prefix_route and we
3441                  * only need to care about prefix routes if ipv6_generate_eui64
3442                  * couldn't generate one.
3443                  */
3444                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3445                         addrconf_add_linklocal(idev, &addr, 0);
3446                 else if (prefix_route)
3447                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3448                                               0, 0, GFP_KERNEL);
3449                 break;
3450         case IN6_ADDR_GEN_MODE_NONE:
3451         default:
3452                 /* will not add any link local address */
3453                 break;
3454         }
3455 }
3456
3457 static void addrconf_dev_config(struct net_device *dev)
3458 {
3459         struct inet6_dev *idev;
3460
3461         ASSERT_RTNL();
3462
3463         if ((dev->type != ARPHRD_ETHER) &&
3464             (dev->type != ARPHRD_FDDI) &&
3465             (dev->type != ARPHRD_ARCNET) &&
3466             (dev->type != ARPHRD_INFINIBAND) &&
3467             (dev->type != ARPHRD_IEEE1394) &&
3468             (dev->type != ARPHRD_TUNNEL6) &&
3469             (dev->type != ARPHRD_6LOWPAN) &&
3470             (dev->type != ARPHRD_TUNNEL) &&
3471             (dev->type != ARPHRD_NONE) &&
3472             (dev->type != ARPHRD_RAWIP)) {
3473                 /* Alas, we support only Ethernet autoconfiguration. */
3474                 idev = __in6_dev_get(dev);
3475                 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3476                     dev->flags & IFF_MULTICAST)
3477                         ipv6_mc_up(idev);
3478                 return;
3479         }
3480
3481         idev = addrconf_add_dev(dev);
3482         if (IS_ERR(idev))
3483                 return;
3484
3485         /* this device type has no EUI support */
3486         if (dev->type == ARPHRD_NONE &&
3487             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3488                 WRITE_ONCE(idev->cnf.addr_gen_mode,
3489                            IN6_ADDR_GEN_MODE_RANDOM);
3490
3491         addrconf_addr_gen(idev, false);
3492 }
3493
3494 #if IS_ENABLED(CONFIG_IPV6_SIT)
3495 static void addrconf_sit_config(struct net_device *dev)
3496 {
3497         struct inet6_dev *idev;
3498
3499         ASSERT_RTNL();
3500
3501         /*
3502          * Configure the tunnel with one of our IPv4
3503          * addresses... we should configure all of
3504          * our v4 addrs in the tunnel
3505          */
3506
3507         idev = ipv6_find_idev(dev);
3508         if (IS_ERR(idev)) {
3509                 pr_debug("%s: add_dev failed\n", __func__);
3510                 return;
3511         }
3512
3513         if (dev->priv_flags & IFF_ISATAP) {
3514                 addrconf_addr_gen(idev, false);
3515                 return;
3516         }
3517
3518         add_v4_addrs(idev);
3519
3520         if (dev->flags&IFF_POINTOPOINT)
3521                 addrconf_add_mroute(dev);
3522 }
3523 #endif
3524
3525 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3526 static void addrconf_gre_config(struct net_device *dev)
3527 {
3528         struct inet6_dev *idev;
3529
3530         ASSERT_RTNL();
3531
3532         idev = ipv6_find_idev(dev);
3533         if (IS_ERR(idev)) {
3534                 pr_debug("%s: add_dev failed\n", __func__);
3535                 return;
3536         }
3537
3538         if (dev->type == ARPHRD_ETHER) {
3539                 addrconf_addr_gen(idev, true);
3540                 return;
3541         }
3542
3543         add_v4_addrs(idev);
3544
3545         if (dev->flags & IFF_POINTOPOINT)
3546                 addrconf_add_mroute(dev);
3547 }
3548 #endif
3549
3550 static void addrconf_init_auto_addrs(struct net_device *dev)
3551 {
3552         switch (dev->type) {
3553 #if IS_ENABLED(CONFIG_IPV6_SIT)
3554         case ARPHRD_SIT:
3555                 addrconf_sit_config(dev);
3556                 break;
3557 #endif
3558 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3559         case ARPHRD_IP6GRE:
3560         case ARPHRD_IPGRE:
3561                 addrconf_gre_config(dev);
3562                 break;
3563 #endif
3564         case ARPHRD_LOOPBACK:
3565                 init_loopback(dev);
3566                 break;
3567
3568         default:
3569                 addrconf_dev_config(dev);
3570                 break;
3571         }
3572 }
3573
3574 static int fixup_permanent_addr(struct net *net,
3575                                 struct inet6_dev *idev,
3576                                 struct inet6_ifaddr *ifp)
3577 {
3578         /* !fib6_node means the host route was removed from the
3579          * FIB, for example, if 'lo' device is taken down. In that
3580          * case regenerate the host route.
3581          */
3582         if (!ifp->rt || !ifp->rt->fib6_node) {
3583                 struct fib6_info *f6i, *prev;
3584
3585                 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3586                                          GFP_ATOMIC, NULL);
3587                 if (IS_ERR(f6i))
3588                         return PTR_ERR(f6i);
3589
3590                 /* ifp->rt can be accessed outside of rtnl */
3591                 spin_lock(&ifp->lock);
3592                 prev = ifp->rt;
3593                 ifp->rt = f6i;
3594                 spin_unlock(&ifp->lock);
3595
3596                 fib6_info_release(prev);
3597         }
3598
3599         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3600                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3601                                       ifp->rt_priority, idev->dev, 0, 0,
3602                                       GFP_ATOMIC);
3603         }
3604
3605         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3606                 addrconf_dad_start(ifp);
3607
3608         return 0;
3609 }
3610
3611 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3612 {
3613         struct inet6_ifaddr *ifp, *tmp;
3614         struct inet6_dev *idev;
3615
3616         idev = __in6_dev_get(dev);
3617         if (!idev)
3618                 return;
3619
3620         write_lock_bh(&idev->lock);
3621
3622         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3623                 if ((ifp->flags & IFA_F_PERMANENT) &&
3624                     fixup_permanent_addr(net, idev, ifp) < 0) {
3625                         write_unlock_bh(&idev->lock);
3626                         in6_ifa_hold(ifp);
3627                         ipv6_del_addr(ifp);
3628                         write_lock_bh(&idev->lock);
3629
3630                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3631                                              idev->dev->name, &ifp->addr);
3632                 }
3633         }
3634
3635         write_unlock_bh(&idev->lock);
3636 }
3637
3638 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3639                            void *ptr)
3640 {
3641         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3642         struct netdev_notifier_change_info *change_info;
3643         struct netdev_notifier_changeupper_info *info;
3644         struct inet6_dev *idev = __in6_dev_get(dev);
3645         struct net *net = dev_net(dev);
3646         int run_pending = 0;
3647         int err;
3648
3649         switch (event) {
3650         case NETDEV_REGISTER:
3651                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3652                         idev = ipv6_add_dev(dev);
3653                         if (IS_ERR(idev))
3654                                 return notifier_from_errno(PTR_ERR(idev));
3655                 }
3656                 break;
3657
3658         case NETDEV_CHANGEMTU:
3659                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3660                 if (dev->mtu < IPV6_MIN_MTU) {
3661                         addrconf_ifdown(dev, dev != net->loopback_dev);
3662                         break;
3663                 }
3664
3665                 if (idev) {
3666                         rt6_mtu_change(dev, dev->mtu);
3667                         WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3668                         break;
3669                 }
3670
3671                 /* allocate new idev */
3672                 idev = ipv6_add_dev(dev);
3673                 if (IS_ERR(idev))
3674                         break;
3675
3676                 /* device is still not ready */
3677                 if (!(idev->if_flags & IF_READY))
3678                         break;
3679
3680                 run_pending = 1;
3681                 fallthrough;
3682         case NETDEV_UP:
3683         case NETDEV_CHANGE:
3684                 if (idev && idev->cnf.disable_ipv6)
3685                         break;
3686
3687                 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3688                         if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3689                             dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3690                                 ipv6_mc_up(idev);
3691                         break;
3692                 }
3693
3694                 if (event == NETDEV_UP) {
3695                         /* restore routes for permanent addresses */
3696                         addrconf_permanent_addr(net, dev);
3697
3698                         if (!addrconf_link_ready(dev)) {
3699                                 /* device is not ready yet. */
3700                                 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3701                                          dev->name);
3702                                 break;
3703                         }
3704
3705                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3706                                 idev = ipv6_add_dev(dev);
3707
3708                         if (!IS_ERR_OR_NULL(idev)) {
3709                                 idev->if_flags |= IF_READY;
3710                                 run_pending = 1;
3711                         }
3712                 } else if (event == NETDEV_CHANGE) {
3713                         if (!addrconf_link_ready(dev)) {
3714                                 /* device is still not ready. */
3715                                 rt6_sync_down_dev(dev, event);
3716                                 break;
3717                         }
3718
3719                         if (!IS_ERR_OR_NULL(idev)) {
3720                                 if (idev->if_flags & IF_READY) {
3721                                         /* device is already configured -
3722                                          * but resend MLD reports, we might
3723                                          * have roamed and need to update
3724                                          * multicast snooping switches
3725                                          */
3726                                         ipv6_mc_up(idev);
3727                                         change_info = ptr;
3728                                         if (change_info->flags_changed & IFF_NOARP)
3729                                                 addrconf_dad_run(idev, true);
3730                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
3731                                         break;
3732                                 }
3733                                 idev->if_flags |= IF_READY;
3734                         }
3735
3736                         pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3737                                  dev->name);
3738
3739                         run_pending = 1;
3740                 }
3741
3742                 addrconf_init_auto_addrs(dev);
3743
3744                 if (!IS_ERR_OR_NULL(idev)) {
3745                         if (run_pending)
3746                                 addrconf_dad_run(idev, false);
3747
3748                         /* Device has an address by now */
3749                         rt6_sync_up(dev, RTNH_F_DEAD);
3750
3751                         /*
3752                          * If the MTU changed during the interface down,
3753                          * when the interface up, the changed MTU must be
3754                          * reflected in the idev as well as routers.
3755                          */
3756                         if (idev->cnf.mtu6 != dev->mtu &&
3757                             dev->mtu >= IPV6_MIN_MTU) {
3758                                 rt6_mtu_change(dev, dev->mtu);
3759                                 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3760                         }
3761                         WRITE_ONCE(idev->tstamp, jiffies);
3762                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3763
3764                         /*
3765                          * If the changed mtu during down is lower than
3766                          * IPV6_MIN_MTU stop IPv6 on this interface.
3767                          */
3768                         if (dev->mtu < IPV6_MIN_MTU)
3769                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3770                 }
3771                 break;
3772
3773         case NETDEV_DOWN:
3774         case NETDEV_UNREGISTER:
3775                 /*
3776                  *      Remove all addresses from this interface.
3777                  */
3778                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3779                 break;
3780
3781         case NETDEV_CHANGENAME:
3782                 if (idev) {
3783                         snmp6_unregister_dev(idev);
3784                         addrconf_sysctl_unregister(idev);
3785                         err = addrconf_sysctl_register(idev);
3786                         if (err)
3787                                 return notifier_from_errno(err);
3788                         err = snmp6_register_dev(idev);
3789                         if (err) {
3790                                 addrconf_sysctl_unregister(idev);
3791                                 return notifier_from_errno(err);
3792                         }
3793                 }
3794                 break;
3795
3796         case NETDEV_PRE_TYPE_CHANGE:
3797         case NETDEV_POST_TYPE_CHANGE:
3798                 if (idev)
3799                         addrconf_type_change(dev, event);
3800                 break;
3801
3802         case NETDEV_CHANGEUPPER:
3803                 info = ptr;
3804
3805                 /* flush all routes if dev is linked to or unlinked from
3806                  * an L3 master device (e.g., VRF)
3807                  */
3808                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3809                         addrconf_ifdown(dev, false);
3810         }
3811
3812         return NOTIFY_OK;
3813 }
3814
3815 /*
3816  *      addrconf module should be notified of a device going up
3817  */
3818 static struct notifier_block ipv6_dev_notf = {
3819         .notifier_call = addrconf_notify,
3820         .priority = ADDRCONF_NOTIFY_PRIORITY,
3821 };
3822
3823 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3824 {
3825         struct inet6_dev *idev;
3826         ASSERT_RTNL();
3827
3828         idev = __in6_dev_get(dev);
3829
3830         if (event == NETDEV_POST_TYPE_CHANGE)
3831                 ipv6_mc_remap(idev);
3832         else if (event == NETDEV_PRE_TYPE_CHANGE)
3833                 ipv6_mc_unmap(idev);
3834 }
3835
3836 static bool addr_is_local(const struct in6_addr *addr)
3837 {
3838         return ipv6_addr_type(addr) &
3839                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3840 }
3841
3842 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3843 {
3844         unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3845         struct net *net = dev_net(dev);
3846         struct inet6_dev *idev;
3847         struct inet6_ifaddr *ifa;
3848         LIST_HEAD(tmp_addr_list);
3849         bool keep_addr = false;
3850         bool was_ready;
3851         int state, i;
3852
3853         ASSERT_RTNL();
3854
3855         rt6_disable_ip(dev, event);
3856
3857         idev = __in6_dev_get(dev);
3858         if (!idev)
3859                 return -ENODEV;
3860
3861         /*
3862          * Step 1: remove reference to ipv6 device from parent device.
3863          *         Do not dev_put!
3864          */
3865         if (unregister) {
3866                 idev->dead = 1;
3867
3868                 /* protected by rtnl_lock */
3869                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3870
3871                 /* Step 1.5: remove snmp6 entry */
3872                 snmp6_unregister_dev(idev);
3873
3874         }
3875
3876         /* combine the user config with event to determine if permanent
3877          * addresses are to be removed from address hash table
3878          */
3879         if (!unregister && !idev->cnf.disable_ipv6) {
3880                 /* aggregate the system setting and interface setting */
3881                 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down);
3882
3883                 if (!_keep_addr)
3884                         _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down);
3885
3886                 keep_addr = (_keep_addr > 0);
3887         }
3888
3889         /* Step 2: clear hash table */
3890         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3891                 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3892
3893                 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3894 restart:
3895                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3896                         if (ifa->idev == idev) {
3897                                 addrconf_del_dad_work(ifa);
3898                                 /* combined flag + permanent flag decide if
3899                                  * address is retained on a down event
3900                                  */
3901                                 if (!keep_addr ||
3902                                     !(ifa->flags & IFA_F_PERMANENT) ||
3903                                     addr_is_local(&ifa->addr)) {
3904                                         hlist_del_init_rcu(&ifa->addr_lst);
3905                                         goto restart;
3906                                 }
3907                         }
3908                 }
3909                 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3910         }
3911
3912         write_lock_bh(&idev->lock);
3913
3914         addrconf_del_rs_timer(idev);
3915
3916         /* Step 2: clear flags for stateless addrconf, repeated down
3917          *         detection
3918          */
3919         was_ready = idev->if_flags & IF_READY;
3920         if (!unregister)
3921                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3922
3923         /* Step 3: clear tempaddr list */
3924         while (!list_empty(&idev->tempaddr_list)) {
3925                 ifa = list_first_entry(&idev->tempaddr_list,
3926                                        struct inet6_ifaddr, tmp_list);
3927                 list_del(&ifa->tmp_list);
3928                 write_unlock_bh(&idev->lock);
3929                 spin_lock_bh(&ifa->lock);
3930
3931                 if (ifa->ifpub) {
3932                         in6_ifa_put(ifa->ifpub);
3933                         ifa->ifpub = NULL;
3934                 }
3935                 spin_unlock_bh(&ifa->lock);
3936                 in6_ifa_put(ifa);
3937                 write_lock_bh(&idev->lock);
3938         }
3939
3940         list_for_each_entry(ifa, &idev->addr_list, if_list)
3941                 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3942         write_unlock_bh(&idev->lock);
3943
3944         while (!list_empty(&tmp_addr_list)) {
3945                 struct fib6_info *rt = NULL;
3946                 bool keep;
3947
3948                 ifa = list_first_entry(&tmp_addr_list,
3949                                        struct inet6_ifaddr, if_list_aux);
3950                 list_del(&ifa->if_list_aux);
3951
3952                 addrconf_del_dad_work(ifa);
3953
3954                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3955                         !addr_is_local(&ifa->addr);
3956
3957                 spin_lock_bh(&ifa->lock);
3958
3959                 if (keep) {
3960                         /* set state to skip the notifier below */
3961                         state = INET6_IFADDR_STATE_DEAD;
3962                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3963                         if (!(ifa->flags & IFA_F_NODAD))
3964                                 ifa->flags |= IFA_F_TENTATIVE;
3965
3966                         rt = ifa->rt;
3967                         ifa->rt = NULL;
3968                 } else {
3969                         state = ifa->state;
3970                         ifa->state = INET6_IFADDR_STATE_DEAD;
3971                 }
3972
3973                 spin_unlock_bh(&ifa->lock);
3974
3975                 if (rt)
3976                         ip6_del_rt(net, rt, false);
3977
3978                 if (state != INET6_IFADDR_STATE_DEAD) {
3979                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3980                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3981                 } else {
3982                         if (idev->cnf.forwarding)
3983                                 addrconf_leave_anycast(ifa);
3984                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3985                 }
3986
3987                 if (!keep) {
3988                         write_lock_bh(&idev->lock);
3989                         list_del_rcu(&ifa->if_list);
3990                         write_unlock_bh(&idev->lock);
3991                         in6_ifa_put(ifa);
3992                 }
3993         }
3994
3995         /* Step 5: Discard anycast and multicast list */
3996         if (unregister) {
3997                 ipv6_ac_destroy_dev(idev);
3998                 ipv6_mc_destroy_dev(idev);
3999         } else if (was_ready) {
4000                 ipv6_mc_down(idev);
4001         }
4002
4003         WRITE_ONCE(idev->tstamp, jiffies);
4004         idev->ra_mtu = 0;
4005
4006         /* Last: Shot the device (if unregistered) */
4007         if (unregister) {
4008                 addrconf_sysctl_unregister(idev);
4009                 neigh_parms_release(&nd_tbl, idev->nd_parms);
4010                 neigh_ifdown(&nd_tbl, dev);
4011                 in6_dev_put(idev);
4012         }
4013         return 0;
4014 }
4015
4016 static void addrconf_rs_timer(struct timer_list *t)
4017 {
4018         struct inet6_dev *idev = from_timer(idev, t, rs_timer);
4019         struct net_device *dev = idev->dev;
4020         struct in6_addr lladdr;
4021         int rtr_solicits;
4022
4023         write_lock(&idev->lock);
4024         if (idev->dead || !(idev->if_flags & IF_READY))
4025                 goto out;
4026
4027         if (!ipv6_accept_ra(idev))
4028                 goto out;
4029
4030         /* Announcement received after solicitation was sent */
4031         if (idev->if_flags & IF_RA_RCVD)
4032                 goto out;
4033
4034         rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits);
4035
4036         if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) {
4037                 write_unlock(&idev->lock);
4038                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4039                         ndisc_send_rs(dev, &lladdr,
4040                                       &in6addr_linklocal_allrouters);
4041                 else
4042                         goto put;
4043
4044                 write_lock(&idev->lock);
4045                 idev->rs_interval = rfc3315_s14_backoff_update(
4046                                 idev->rs_interval,
4047                                 READ_ONCE(idev->cnf.rtr_solicit_max_interval));
4048                 /* The wait after the last probe can be shorter */
4049                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
4050                                              READ_ONCE(idev->cnf.rtr_solicits)) ?
4051                                       READ_ONCE(idev->cnf.rtr_solicit_delay) :
4052                                       idev->rs_interval);
4053         } else {
4054                 /*
4055                  * Note: we do not support deprecated "all on-link"
4056                  * assumption any longer.
4057                  */
4058                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4059         }
4060
4061 out:
4062         write_unlock(&idev->lock);
4063 put:
4064         in6_dev_put(idev);
4065 }
4066
4067 /*
4068  *      Duplicate Address Detection
4069  */
4070 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4071 {
4072         struct inet6_dev *idev = ifp->idev;
4073         unsigned long rand_num;
4074         u64 nonce;
4075
4076         if (ifp->flags & IFA_F_OPTIMISTIC)
4077                 rand_num = 0;
4078         else
4079                 rand_num = get_random_u32_below(
4080                                 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1);
4081
4082         nonce = 0;
4083         if (READ_ONCE(idev->cnf.enhanced_dad) ||
4084             READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) {
4085                 do
4086                         get_random_bytes(&nonce, 6);
4087                 while (nonce == 0);
4088         }
4089         ifp->dad_nonce = nonce;
4090         ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits);
4091         addrconf_mod_dad_work(ifp, rand_num);
4092 }
4093
4094 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4095 {
4096         struct inet6_dev *idev = ifp->idev;
4097         struct net_device *dev = idev->dev;
4098         bool bump_id, notify = false;
4099         struct net *net;
4100
4101         addrconf_join_solict(dev, &ifp->addr);
4102
4103         read_lock_bh(&idev->lock);
4104         spin_lock(&ifp->lock);
4105         if (ifp->state == INET6_IFADDR_STATE_DEAD)
4106                 goto out;
4107
4108         net = dev_net(dev);
4109         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4110             (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 &&
4111              READ_ONCE(idev->cnf.accept_dad) < 1) ||
4112             !(ifp->flags&IFA_F_TENTATIVE) ||
4113             ifp->flags & IFA_F_NODAD) {
4114                 bool send_na = false;
4115
4116                 if (ifp->flags & IFA_F_TENTATIVE &&
4117                     !(ifp->flags & IFA_F_OPTIMISTIC))
4118                         send_na = true;
4119                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4120                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4121                 spin_unlock(&ifp->lock);
4122                 read_unlock_bh(&idev->lock);
4123
4124                 addrconf_dad_completed(ifp, bump_id, send_na);
4125                 return;
4126         }
4127
4128         if (!(idev->if_flags & IF_READY)) {
4129                 spin_unlock(&ifp->lock);
4130                 read_unlock_bh(&idev->lock);
4131                 /*
4132                  * If the device is not ready:
4133                  * - keep it tentative if it is a permanent address.
4134                  * - otherwise, kill it.
4135                  */
4136                 in6_ifa_hold(ifp);
4137                 addrconf_dad_stop(ifp, 0);
4138                 return;
4139         }
4140
4141         /*
4142          * Optimistic nodes can start receiving
4143          * Frames right away
4144          */
4145         if (ifp->flags & IFA_F_OPTIMISTIC) {
4146                 ip6_ins_rt(net, ifp->rt);
4147                 if (ipv6_use_optimistic_addr(net, idev)) {
4148                         /* Because optimistic nodes can use this address,
4149                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
4150                          */
4151                         notify = true;
4152                 }
4153         }
4154
4155         addrconf_dad_kick(ifp);
4156 out:
4157         spin_unlock(&ifp->lock);
4158         read_unlock_bh(&idev->lock);
4159         if (notify)
4160                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4161 }
4162
4163 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4164 {
4165         bool begin_dad = false;
4166
4167         spin_lock_bh(&ifp->lock);
4168         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4169                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4170                 begin_dad = true;
4171         }
4172         spin_unlock_bh(&ifp->lock);
4173
4174         if (begin_dad)
4175                 addrconf_mod_dad_work(ifp, 0);
4176 }
4177
4178 static void addrconf_dad_work(struct work_struct *w)
4179 {
4180         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4181                                                 struct inet6_ifaddr,
4182                                                 dad_work);
4183         struct inet6_dev *idev = ifp->idev;
4184         bool bump_id, disable_ipv6 = false;
4185         struct in6_addr mcaddr;
4186
4187         enum {
4188                 DAD_PROCESS,
4189                 DAD_BEGIN,
4190                 DAD_ABORT,
4191         } action = DAD_PROCESS;
4192
4193         rtnl_lock();
4194
4195         spin_lock_bh(&ifp->lock);
4196         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4197                 action = DAD_BEGIN;
4198                 ifp->state = INET6_IFADDR_STATE_DAD;
4199         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4200                 action = DAD_ABORT;
4201                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4202
4203                 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 ||
4204                      READ_ONCE(idev->cnf.accept_dad) > 1) &&
4205                     !idev->cnf.disable_ipv6 &&
4206                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4207                         struct in6_addr addr;
4208
4209                         addr.s6_addr32[0] = htonl(0xfe800000);
4210                         addr.s6_addr32[1] = 0;
4211
4212                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4213                             ipv6_addr_equal(&ifp->addr, &addr)) {
4214                                 /* DAD failed for link-local based on MAC */
4215                                 WRITE_ONCE(idev->cnf.disable_ipv6, 1);
4216
4217                                 pr_info("%s: IPv6 being disabled!\n",
4218                                         ifp->idev->dev->name);
4219                                 disable_ipv6 = true;
4220                         }
4221                 }
4222         }
4223         spin_unlock_bh(&ifp->lock);
4224
4225         if (action == DAD_BEGIN) {
4226                 addrconf_dad_begin(ifp);
4227                 goto out;
4228         } else if (action == DAD_ABORT) {
4229                 in6_ifa_hold(ifp);
4230                 addrconf_dad_stop(ifp, 1);
4231                 if (disable_ipv6)
4232                         addrconf_ifdown(idev->dev, false);
4233                 goto out;
4234         }
4235
4236         if (!ifp->dad_probes && addrconf_dad_end(ifp))
4237                 goto out;
4238
4239         write_lock_bh(&idev->lock);
4240         if (idev->dead || !(idev->if_flags & IF_READY)) {
4241                 write_unlock_bh(&idev->lock);
4242                 goto out;
4243         }
4244
4245         spin_lock(&ifp->lock);
4246         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4247                 spin_unlock(&ifp->lock);
4248                 write_unlock_bh(&idev->lock);
4249                 goto out;
4250         }
4251
4252         if (ifp->dad_probes == 0) {
4253                 bool send_na = false;
4254
4255                 /*
4256                  * DAD was successful
4257                  */
4258
4259                 if (ifp->flags & IFA_F_TENTATIVE &&
4260                     !(ifp->flags & IFA_F_OPTIMISTIC))
4261                         send_na = true;
4262                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4263                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4264                 spin_unlock(&ifp->lock);
4265                 write_unlock_bh(&idev->lock);
4266
4267                 addrconf_dad_completed(ifp, bump_id, send_na);
4268
4269                 goto out;
4270         }
4271
4272         ifp->dad_probes--;
4273         addrconf_mod_dad_work(ifp,
4274                               max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4275                                   HZ/100));
4276         spin_unlock(&ifp->lock);
4277         write_unlock_bh(&idev->lock);
4278
4279         /* send a neighbour solicitation for our addr */
4280         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4281         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4282                       ifp->dad_nonce);
4283 out:
4284         in6_ifa_put(ifp);
4285         rtnl_unlock();
4286 }
4287
4288 /* ifp->idev must be at least read locked */
4289 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4290 {
4291         struct inet6_ifaddr *ifpiter;
4292         struct inet6_dev *idev = ifp->idev;
4293
4294         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4295                 if (ifpiter->scope > IFA_LINK)
4296                         break;
4297                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4298                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4299                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4300                     IFA_F_PERMANENT)
4301                         return false;
4302         }
4303         return true;
4304 }
4305
4306 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4307                                    bool send_na)
4308 {
4309         struct net_device *dev = ifp->idev->dev;
4310         struct in6_addr lladdr;
4311         bool send_rs, send_mld;
4312
4313         addrconf_del_dad_work(ifp);
4314
4315         /*
4316          *      Configure the address for reception. Now it is valid.
4317          */
4318
4319         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4320
4321         /* If added prefix is link local and we are prepared to process
4322            router advertisements, start sending router solicitations.
4323          */
4324
4325         read_lock_bh(&ifp->idev->lock);
4326         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4327         send_rs = send_mld &&
4328                   ipv6_accept_ra(ifp->idev) &&
4329                   READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 &&
4330                   (dev->flags & IFF_LOOPBACK) == 0 &&
4331                   (dev->type != ARPHRD_TUNNEL) &&
4332                   !netif_is_team_port(dev);
4333         read_unlock_bh(&ifp->idev->lock);
4334
4335         /* While dad is in progress mld report's source address is in6_addrany.
4336          * Resend with proper ll now.
4337          */
4338         if (send_mld)
4339                 ipv6_mc_dad_complete(ifp->idev);
4340
4341         /* send unsolicited NA if enabled */
4342         if (send_na &&
4343             (READ_ONCE(ifp->idev->cnf.ndisc_notify) ||
4344              READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) {
4345                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4346                               /*router=*/ !!ifp->idev->cnf.forwarding,
4347                               /*solicited=*/ false, /*override=*/ true,
4348                               /*inc_opt=*/ true);
4349         }
4350
4351         if (send_rs) {
4352                 /*
4353                  *      If a host as already performed a random delay
4354                  *      [...] as part of DAD [...] there is no need
4355                  *      to delay again before sending the first RS
4356                  */
4357                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4358                         return;
4359                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4360
4361                 write_lock_bh(&ifp->idev->lock);
4362                 spin_lock(&ifp->lock);
4363                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4364                         READ_ONCE(ifp->idev->cnf.rtr_solicit_interval));
4365                 ifp->idev->rs_probes = 1;
4366                 ifp->idev->if_flags |= IF_RS_SENT;
4367                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4368                 spin_unlock(&ifp->lock);
4369                 write_unlock_bh(&ifp->idev->lock);
4370         }
4371
4372         if (bump_id)
4373                 rt_genid_bump_ipv6(dev_net(dev));
4374
4375         /* Make sure that a new temporary address will be created
4376          * before this temporary address becomes deprecated.
4377          */
4378         if (ifp->flags & IFA_F_TEMPORARY)
4379                 addrconf_verify_rtnl(dev_net(dev));
4380 }
4381
4382 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4383 {
4384         struct inet6_ifaddr *ifp;
4385
4386         read_lock_bh(&idev->lock);
4387         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4388                 spin_lock(&ifp->lock);
4389                 if ((ifp->flags & IFA_F_TENTATIVE &&
4390                      ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4391                         if (restart)
4392                                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4393                         addrconf_dad_kick(ifp);
4394                 }
4395                 spin_unlock(&ifp->lock);
4396         }
4397         read_unlock_bh(&idev->lock);
4398 }
4399
4400 #ifdef CONFIG_PROC_FS
4401 struct if6_iter_state {
4402         struct seq_net_private p;
4403         int bucket;
4404         int offset;
4405 };
4406
4407 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4408 {
4409         struct if6_iter_state *state = seq->private;
4410         struct net *net = seq_file_net(seq);
4411         struct inet6_ifaddr *ifa = NULL;
4412         int p = 0;
4413
4414         /* initial bucket if pos is 0 */
4415         if (pos == 0) {
4416                 state->bucket = 0;
4417                 state->offset = 0;
4418         }
4419
4420         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4421                 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4422                                          addr_lst) {
4423                         /* sync with offset */
4424                         if (p < state->offset) {
4425                                 p++;
4426                                 continue;
4427                         }
4428                         return ifa;
4429                 }
4430
4431                 /* prepare for next bucket */
4432                 state->offset = 0;
4433                 p = 0;
4434         }
4435         return NULL;
4436 }
4437
4438 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4439                                          struct inet6_ifaddr *ifa)
4440 {
4441         struct if6_iter_state *state = seq->private;
4442         struct net *net = seq_file_net(seq);
4443
4444         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4445                 state->offset++;
4446                 return ifa;
4447         }
4448
4449         state->offset = 0;
4450         while (++state->bucket < IN6_ADDR_HSIZE) {
4451                 hlist_for_each_entry_rcu(ifa,
4452                                      &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4453                         return ifa;
4454                 }
4455         }
4456
4457         return NULL;
4458 }
4459
4460 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4461         __acquires(rcu)
4462 {
4463         rcu_read_lock();
4464         return if6_get_first(seq, *pos);
4465 }
4466
4467 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4468 {
4469         struct inet6_ifaddr *ifa;
4470
4471         ifa = if6_get_next(seq, v);
4472         ++*pos;
4473         return ifa;
4474 }
4475
4476 static void if6_seq_stop(struct seq_file *seq, void *v)
4477         __releases(rcu)
4478 {
4479         rcu_read_unlock();
4480 }
4481
4482 static int if6_seq_show(struct seq_file *seq, void *v)
4483 {
4484         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4485         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4486                    &ifp->addr,
4487                    ifp->idev->dev->ifindex,
4488                    ifp->prefix_len,
4489                    ifp->scope,
4490                    (u8) ifp->flags,
4491                    ifp->idev->dev->name);
4492         return 0;
4493 }
4494
4495 static const struct seq_operations if6_seq_ops = {
4496         .start  = if6_seq_start,
4497         .next   = if6_seq_next,
4498         .show   = if6_seq_show,
4499         .stop   = if6_seq_stop,
4500 };
4501
4502 static int __net_init if6_proc_net_init(struct net *net)
4503 {
4504         if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4505                         sizeof(struct if6_iter_state)))
4506                 return -ENOMEM;
4507         return 0;
4508 }
4509
4510 static void __net_exit if6_proc_net_exit(struct net *net)
4511 {
4512         remove_proc_entry("if_inet6", net->proc_net);
4513 }
4514
4515 static struct pernet_operations if6_proc_net_ops = {
4516         .init = if6_proc_net_init,
4517         .exit = if6_proc_net_exit,
4518 };
4519
4520 int __init if6_proc_init(void)
4521 {
4522         return register_pernet_subsys(&if6_proc_net_ops);
4523 }
4524
4525 void if6_proc_exit(void)
4526 {
4527         unregister_pernet_subsys(&if6_proc_net_ops);
4528 }
4529 #endif  /* CONFIG_PROC_FS */
4530
4531 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4532 /* Check if address is a home address configured on any interface. */
4533 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4534 {
4535         unsigned int hash = inet6_addr_hash(net, addr);
4536         struct inet6_ifaddr *ifp = NULL;
4537         int ret = 0;
4538
4539         rcu_read_lock();
4540         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4541                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4542                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4543                         ret = 1;
4544                         break;
4545                 }
4546         }
4547         rcu_read_unlock();
4548         return ret;
4549 }
4550 #endif
4551
4552 /* RFC6554 has some algorithm to avoid loops in segment routing by
4553  * checking if the segments contains any of a local interface address.
4554  *
4555  * Quote:
4556  *
4557  * To detect loops in the SRH, a router MUST determine if the SRH
4558  * includes multiple addresses assigned to any interface on that router.
4559  * If such addresses appear more than once and are separated by at least
4560  * one address not assigned to that router.
4561  */
4562 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4563                           unsigned char nsegs)
4564 {
4565         const struct in6_addr *addr;
4566         int i, ret = 0, found = 0;
4567         struct inet6_ifaddr *ifp;
4568         bool separated = false;
4569         unsigned int hash;
4570         bool hash_found;
4571
4572         rcu_read_lock();
4573         for (i = 0; i < nsegs; i++) {
4574                 addr = &segs[i];
4575                 hash = inet6_addr_hash(net, addr);
4576
4577                 hash_found = false;
4578                 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4579
4580                         if (ipv6_addr_equal(&ifp->addr, addr)) {
4581                                 hash_found = true;
4582                                 break;
4583                         }
4584                 }
4585
4586                 if (hash_found) {
4587                         if (found > 1 && separated) {
4588                                 ret = 1;
4589                                 break;
4590                         }
4591
4592                         separated = false;
4593                         found++;
4594                 } else {
4595                         separated = true;
4596                 }
4597         }
4598         rcu_read_unlock();
4599
4600         return ret;
4601 }
4602
4603 /*
4604  *      Periodic address status verification
4605  */
4606
4607 static void addrconf_verify_rtnl(struct net *net)
4608 {
4609         unsigned long now, next, next_sec, next_sched;
4610         struct inet6_ifaddr *ifp;
4611         int i;
4612
4613         ASSERT_RTNL();
4614
4615         rcu_read_lock_bh();
4616         now = jiffies;
4617         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4618
4619         cancel_delayed_work(&net->ipv6.addr_chk_work);
4620
4621         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4622 restart:
4623                 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4624                         unsigned long age;
4625
4626                         /* When setting preferred_lft to a value not zero or
4627                          * infinity, while valid_lft is infinity
4628                          * IFA_F_PERMANENT has a non-infinity life time.
4629                          */
4630                         if ((ifp->flags & IFA_F_PERMANENT) &&
4631                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4632                                 continue;
4633
4634                         spin_lock(&ifp->lock);
4635                         /* We try to batch several events at once. */
4636                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4637
4638                         if ((ifp->flags&IFA_F_TEMPORARY) &&
4639                             !(ifp->flags&IFA_F_TENTATIVE) &&
4640                             ifp->prefered_lft != INFINITY_LIFE_TIME &&
4641                             !ifp->regen_count && ifp->ifpub) {
4642                                 /* This is a non-regenerated temporary addr. */
4643
4644                                 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev);
4645
4646                                 if (age + regen_advance >= ifp->prefered_lft) {
4647                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4648                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4649                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4650
4651                                         ifp->regen_count++;
4652                                         in6_ifa_hold(ifp);
4653                                         in6_ifa_hold(ifpub);
4654                                         spin_unlock(&ifp->lock);
4655
4656                                         spin_lock(&ifpub->lock);
4657                                         ifpub->regen_count = 0;
4658                                         spin_unlock(&ifpub->lock);
4659                                         rcu_read_unlock_bh();
4660                                         ipv6_create_tempaddr(ifpub, true);
4661                                         in6_ifa_put(ifpub);
4662                                         in6_ifa_put(ifp);
4663                                         rcu_read_lock_bh();
4664                                         goto restart;
4665                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4666                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4667                         }
4668
4669                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4670                             age >= ifp->valid_lft) {
4671                                 spin_unlock(&ifp->lock);
4672                                 in6_ifa_hold(ifp);
4673                                 rcu_read_unlock_bh();
4674                                 ipv6_del_addr(ifp);
4675                                 rcu_read_lock_bh();
4676                                 goto restart;
4677                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4678                                 spin_unlock(&ifp->lock);
4679                                 continue;
4680                         } else if (age >= ifp->prefered_lft) {
4681                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4682                                 int deprecate = 0;
4683
4684                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4685                                         deprecate = 1;
4686                                         ifp->flags |= IFA_F_DEPRECATED;
4687                                 }
4688
4689                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4690                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4691                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4692
4693                                 spin_unlock(&ifp->lock);
4694
4695                                 if (deprecate) {
4696                                         in6_ifa_hold(ifp);
4697
4698                                         ipv6_ifa_notify(0, ifp);
4699                                         in6_ifa_put(ifp);
4700                                         goto restart;
4701                                 }
4702                         } else {
4703                                 /* ifp->prefered_lft <= ifp->valid_lft */
4704                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4705                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4706                                 spin_unlock(&ifp->lock);
4707                         }
4708                 }
4709         }
4710
4711         next_sec = round_jiffies_up(next);
4712         next_sched = next;
4713
4714         /* If rounded timeout is accurate enough, accept it. */
4715         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4716                 next_sched = next_sec;
4717
4718         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4719         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4720                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4721
4722         pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4723                  now, next, next_sec, next_sched);
4724         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4725         rcu_read_unlock_bh();
4726 }
4727
4728 static void addrconf_verify_work(struct work_struct *w)
4729 {
4730         struct net *net = container_of(to_delayed_work(w), struct net,
4731                                        ipv6.addr_chk_work);
4732
4733         rtnl_lock();
4734         addrconf_verify_rtnl(net);
4735         rtnl_unlock();
4736 }
4737
4738 static void addrconf_verify(struct net *net)
4739 {
4740         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4741 }
4742
4743 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4744                                      struct in6_addr **peer_pfx)
4745 {
4746         struct in6_addr *pfx = NULL;
4747
4748         *peer_pfx = NULL;
4749
4750         if (addr)
4751                 pfx = nla_data(addr);
4752
4753         if (local) {
4754                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4755                         *peer_pfx = pfx;
4756                 pfx = nla_data(local);
4757         }
4758
4759         return pfx;
4760 }
4761
4762 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4763         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4764         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4765         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4766         [IFA_FLAGS]             = { .len = sizeof(u32) },
4767         [IFA_RT_PRIORITY]       = { .len = sizeof(u32) },
4768         [IFA_TARGET_NETNSID]    = { .type = NLA_S32 },
4769         [IFA_PROTO]             = { .type = NLA_U8 },
4770 };
4771
4772 static int
4773 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4774                   struct netlink_ext_ack *extack)
4775 {
4776         struct net *net = sock_net(skb->sk);
4777         struct ifaddrmsg *ifm;
4778         struct nlattr *tb[IFA_MAX+1];
4779         struct in6_addr *pfx, *peer_pfx;
4780         u32 ifa_flags;
4781         int err;
4782
4783         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4784                                      ifa_ipv6_policy, extack);
4785         if (err < 0)
4786                 return err;
4787
4788         ifm = nlmsg_data(nlh);
4789         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4790         if (!pfx)
4791                 return -EINVAL;
4792
4793         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4794
4795         /* We ignore other flags so far. */
4796         ifa_flags &= IFA_F_MANAGETEMPADDR;
4797
4798         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4799                               ifm->ifa_prefixlen, extack);
4800 }
4801
4802 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4803                                unsigned long expires, u32 flags,
4804                                bool modify_peer)
4805 {
4806         struct fib6_table *table;
4807         struct fib6_info *f6i;
4808         u32 prio;
4809
4810         f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4811                                         ifp->prefix_len,
4812                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
4813         if (!f6i)
4814                 return -ENOENT;
4815
4816         prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4817         if (f6i->fib6_metric != prio) {
4818                 /* delete old one */
4819                 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4820
4821                 /* add new one */
4822                 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4823                                       ifp->prefix_len,
4824                                       ifp->rt_priority, ifp->idev->dev,
4825                                       expires, flags, GFP_KERNEL);
4826         } else {
4827                 table = f6i->fib6_table;
4828                 spin_lock_bh(&table->tb6_lock);
4829
4830                 if (!(flags & RTF_EXPIRES)) {
4831                         fib6_clean_expires(f6i);
4832                         fib6_remove_gc_list(f6i);
4833                 } else {
4834                         fib6_set_expires(f6i, expires);
4835                         fib6_add_gc_list(f6i);
4836                 }
4837
4838                 spin_unlock_bh(&table->tb6_lock);
4839
4840                 fib6_info_release(f6i);
4841         }
4842
4843         return 0;
4844 }
4845
4846 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4847                              struct ifa6_config *cfg)
4848 {
4849         u32 flags;
4850         clock_t expires;
4851         unsigned long timeout;
4852         bool was_managetempaddr;
4853         bool had_prefixroute;
4854         bool new_peer = false;
4855
4856         ASSERT_RTNL();
4857
4858         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4859                 return -EINVAL;
4860
4861         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4862             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4863                 return -EINVAL;
4864
4865         if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4866                 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4867
4868         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4869         if (addrconf_finite_timeout(timeout)) {
4870                 expires = jiffies_to_clock_t(timeout * HZ);
4871                 cfg->valid_lft = timeout;
4872                 flags = RTF_EXPIRES;
4873         } else {
4874                 expires = 0;
4875                 flags = 0;
4876                 cfg->ifa_flags |= IFA_F_PERMANENT;
4877         }
4878
4879         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4880         if (addrconf_finite_timeout(timeout)) {
4881                 if (timeout == 0)
4882                         cfg->ifa_flags |= IFA_F_DEPRECATED;
4883                 cfg->preferred_lft = timeout;
4884         }
4885
4886         if (cfg->peer_pfx &&
4887             memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4888                 if (!ipv6_addr_any(&ifp->peer_addr))
4889                         cleanup_prefix_route(ifp, expires, true, true);
4890                 new_peer = true;
4891         }
4892
4893         spin_lock_bh(&ifp->lock);
4894         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4895         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4896                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4897         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4898                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4899                         IFA_F_NOPREFIXROUTE);
4900         ifp->flags |= cfg->ifa_flags;
4901         WRITE_ONCE(ifp->tstamp, jiffies);
4902         WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
4903         WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
4904         WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
4905
4906         if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4907                 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
4908
4909         if (new_peer)
4910                 ifp->peer_addr = *cfg->peer_pfx;
4911
4912         spin_unlock_bh(&ifp->lock);
4913         if (!(ifp->flags&IFA_F_TENTATIVE))
4914                 ipv6_ifa_notify(0, ifp);
4915
4916         if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4917                 int rc = -ENOENT;
4918
4919                 if (had_prefixroute)
4920                         rc = modify_prefix_route(ifp, expires, flags, false);
4921
4922                 /* prefix route could have been deleted; if so restore it */
4923                 if (rc == -ENOENT) {
4924                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4925                                               ifp->rt_priority, ifp->idev->dev,
4926                                               expires, flags, GFP_KERNEL);
4927                 }
4928
4929                 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4930                         rc = modify_prefix_route(ifp, expires, flags, true);
4931
4932                 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4933                         addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4934                                               ifp->rt_priority, ifp->idev->dev,
4935                                               expires, flags, GFP_KERNEL);
4936                 }
4937         } else if (had_prefixroute) {
4938                 enum cleanup_prefix_rt_t action;
4939                 unsigned long rt_expires;
4940
4941                 write_lock_bh(&ifp->idev->lock);
4942                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4943                 write_unlock_bh(&ifp->idev->lock);
4944
4945                 if (action != CLEANUP_PREFIX_RT_NOP) {
4946                         cleanup_prefix_route(ifp, rt_expires,
4947                                 action == CLEANUP_PREFIX_RT_DEL, false);
4948                 }
4949         }
4950
4951         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4952                 if (was_managetempaddr &&
4953                     !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4954                         cfg->valid_lft = 0;
4955                         cfg->preferred_lft = 0;
4956                 }
4957                 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4958                                  cfg->preferred_lft, !was_managetempaddr,
4959                                  jiffies);
4960         }
4961
4962         addrconf_verify_rtnl(net);
4963
4964         return 0;
4965 }
4966
4967 static int
4968 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4969                   struct netlink_ext_ack *extack)
4970 {
4971         struct net *net = sock_net(skb->sk);
4972         struct ifaddrmsg *ifm;
4973         struct nlattr *tb[IFA_MAX+1];
4974         struct in6_addr *peer_pfx;
4975         struct inet6_ifaddr *ifa;
4976         struct net_device *dev;
4977         struct inet6_dev *idev;
4978         struct ifa6_config cfg;
4979         int err;
4980
4981         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4982                                      ifa_ipv6_policy, extack);
4983         if (err < 0)
4984                 return err;
4985
4986         memset(&cfg, 0, sizeof(cfg));
4987
4988         ifm = nlmsg_data(nlh);
4989         cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4990         if (!cfg.pfx)
4991                 return -EINVAL;
4992
4993         cfg.peer_pfx = peer_pfx;
4994         cfg.plen = ifm->ifa_prefixlen;
4995         if (tb[IFA_RT_PRIORITY])
4996                 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4997
4998         if (tb[IFA_PROTO])
4999                 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
5000
5001         cfg.valid_lft = INFINITY_LIFE_TIME;
5002         cfg.preferred_lft = INFINITY_LIFE_TIME;
5003
5004         if (tb[IFA_CACHEINFO]) {
5005                 struct ifa_cacheinfo *ci;
5006
5007                 ci = nla_data(tb[IFA_CACHEINFO]);
5008                 cfg.valid_lft = ci->ifa_valid;
5009                 cfg.preferred_lft = ci->ifa_prefered;
5010         }
5011
5012         dev =  __dev_get_by_index(net, ifm->ifa_index);
5013         if (!dev) {
5014                 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
5015                 return -ENODEV;
5016         }
5017
5018         if (tb[IFA_FLAGS])
5019                 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
5020         else
5021                 cfg.ifa_flags = ifm->ifa_flags;
5022
5023         /* We ignore other flags so far. */
5024         cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
5025                          IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
5026                          IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
5027
5028         idev = ipv6_find_idev(dev);
5029         if (IS_ERR(idev))
5030                 return PTR_ERR(idev);
5031
5032         if (!ipv6_allow_optimistic_dad(net, idev))
5033                 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
5034
5035         if (cfg.ifa_flags & IFA_F_NODAD &&
5036             cfg.ifa_flags & IFA_F_OPTIMISTIC) {
5037                 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
5038                 return -EINVAL;
5039         }
5040
5041         ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
5042         if (!ifa) {
5043                 /*
5044                  * It would be best to check for !NLM_F_CREATE here but
5045                  * userspace already relies on not having to provide this.
5046                  */
5047                 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
5048         }
5049
5050         if (nlh->nlmsg_flags & NLM_F_EXCL ||
5051             !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5052                 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5053                 err = -EEXIST;
5054         } else {
5055                 err = inet6_addr_modify(net, ifa, &cfg);
5056         }
5057
5058         in6_ifa_put(ifa);
5059
5060         return err;
5061 }
5062
5063 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5064                           u8 scope, int ifindex)
5065 {
5066         struct ifaddrmsg *ifm;
5067
5068         ifm = nlmsg_data(nlh);
5069         ifm->ifa_family = AF_INET6;
5070         ifm->ifa_prefixlen = prefixlen;
5071         ifm->ifa_flags = flags;
5072         ifm->ifa_scope = scope;
5073         ifm->ifa_index = ifindex;
5074 }
5075
5076 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5077                          unsigned long tstamp, u32 preferred, u32 valid)
5078 {
5079         struct ifa_cacheinfo ci;
5080
5081         ci.cstamp = cstamp_delta(cstamp);
5082         ci.tstamp = cstamp_delta(tstamp);
5083         ci.ifa_prefered = preferred;
5084         ci.ifa_valid = valid;
5085
5086         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5087 }
5088
5089 static inline int rt_scope(int ifa_scope)
5090 {
5091         if (ifa_scope & IFA_HOST)
5092                 return RT_SCOPE_HOST;
5093         else if (ifa_scope & IFA_LINK)
5094                 return RT_SCOPE_LINK;
5095         else if (ifa_scope & IFA_SITE)
5096                 return RT_SCOPE_SITE;
5097         else
5098                 return RT_SCOPE_UNIVERSE;
5099 }
5100
5101 static inline int inet6_ifaddr_msgsize(void)
5102 {
5103         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5104                + nla_total_size(16) /* IFA_LOCAL */
5105                + nla_total_size(16) /* IFA_ADDRESS */
5106                + nla_total_size(sizeof(struct ifa_cacheinfo))
5107                + nla_total_size(4)  /* IFA_FLAGS */
5108                + nla_total_size(1)  /* IFA_PROTO */
5109                + nla_total_size(4)  /* IFA_RT_PRIORITY */;
5110 }
5111
5112 enum addr_type_t {
5113         UNICAST_ADDR,
5114         MULTICAST_ADDR,
5115         ANYCAST_ADDR,
5116 };
5117
5118 struct inet6_fill_args {
5119         u32 portid;
5120         u32 seq;
5121         int event;
5122         unsigned int flags;
5123         int netnsid;
5124         int ifindex;
5125         enum addr_type_t type;
5126 };
5127
5128 static int inet6_fill_ifaddr(struct sk_buff *skb,
5129                              const struct inet6_ifaddr *ifa,
5130                              struct inet6_fill_args *args)
5131 {
5132         struct nlmsghdr *nlh;
5133         u32 preferred, valid;
5134         u32 flags, priority;
5135         u8 proto;
5136
5137         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5138                         sizeof(struct ifaddrmsg), args->flags);
5139         if (!nlh)
5140                 return -EMSGSIZE;
5141
5142         flags = READ_ONCE(ifa->flags);
5143         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5144                       ifa->idev->dev->ifindex);
5145
5146         if (args->netnsid >= 0 &&
5147             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5148                 goto error;
5149
5150         preferred = READ_ONCE(ifa->prefered_lft);
5151         valid = READ_ONCE(ifa->valid_lft);
5152
5153         if (!((flags & IFA_F_PERMANENT) &&
5154               (preferred == INFINITY_LIFE_TIME))) {
5155                 if (preferred != INFINITY_LIFE_TIME) {
5156                         long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
5157
5158                         if (preferred > tval)
5159                                 preferred -= tval;
5160                         else
5161                                 preferred = 0;
5162                         if (valid != INFINITY_LIFE_TIME) {
5163                                 if (valid > tval)
5164                                         valid -= tval;
5165                                 else
5166                                         valid = 0;
5167                         }
5168                 }
5169         } else {
5170                 preferred = INFINITY_LIFE_TIME;
5171                 valid = INFINITY_LIFE_TIME;
5172         }
5173
5174         if (!ipv6_addr_any(&ifa->peer_addr)) {
5175                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5176                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5177                         goto error;
5178         } else {
5179                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5180                         goto error;
5181         }
5182
5183         priority = READ_ONCE(ifa->rt_priority);
5184         if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
5185                 goto error;
5186
5187         if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
5188                           preferred, valid) < 0)
5189                 goto error;
5190
5191         if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
5192                 goto error;
5193
5194         proto = READ_ONCE(ifa->ifa_proto);
5195         if (proto && nla_put_u8(skb, IFA_PROTO, proto))
5196                 goto error;
5197
5198         nlmsg_end(skb, nlh);
5199         return 0;
5200
5201 error:
5202         nlmsg_cancel(skb, nlh);
5203         return -EMSGSIZE;
5204 }
5205
5206 static int inet6_fill_ifmcaddr(struct sk_buff *skb,
5207                                const struct ifmcaddr6 *ifmca,
5208                                struct inet6_fill_args *args)
5209 {
5210         int ifindex = ifmca->idev->dev->ifindex;
5211         u8 scope = RT_SCOPE_UNIVERSE;
5212         struct nlmsghdr *nlh;
5213
5214         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5215                 scope = RT_SCOPE_SITE;
5216
5217         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5218                         sizeof(struct ifaddrmsg), args->flags);
5219         if (!nlh)
5220                 return -EMSGSIZE;
5221
5222         if (args->netnsid >= 0 &&
5223             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5224                 nlmsg_cancel(skb, nlh);
5225                 return -EMSGSIZE;
5226         }
5227
5228         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5229         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5230             put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
5231                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5232                 nlmsg_cancel(skb, nlh);
5233                 return -EMSGSIZE;
5234         }
5235
5236         nlmsg_end(skb, nlh);
5237         return 0;
5238 }
5239
5240 static int inet6_fill_ifacaddr(struct sk_buff *skb,
5241                                const struct ifacaddr6 *ifaca,
5242                                struct inet6_fill_args *args)
5243 {
5244         struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5245         int ifindex = dev ? dev->ifindex : 1;
5246         u8 scope = RT_SCOPE_UNIVERSE;
5247         struct nlmsghdr *nlh;
5248
5249         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5250                 scope = RT_SCOPE_SITE;
5251
5252         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5253                         sizeof(struct ifaddrmsg), args->flags);
5254         if (!nlh)
5255                 return -EMSGSIZE;
5256
5257         if (args->netnsid >= 0 &&
5258             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5259                 nlmsg_cancel(skb, nlh);
5260                 return -EMSGSIZE;
5261         }
5262
5263         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5264         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5265             put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
5266                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5267                 nlmsg_cancel(skb, nlh);
5268                 return -EMSGSIZE;
5269         }
5270
5271         nlmsg_end(skb, nlh);
5272         return 0;
5273 }
5274
5275 /* called with rcu_read_lock() */
5276 static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
5277                           struct netlink_callback *cb, int *s_ip_idx,
5278                           struct inet6_fill_args *fillargs)
5279 {
5280         const struct ifmcaddr6 *ifmca;
5281         const struct ifacaddr6 *ifaca;
5282         int ip_idx = 0;
5283         int err = 0;
5284
5285         switch (fillargs->type) {
5286         case UNICAST_ADDR: {
5287                 const struct inet6_ifaddr *ifa;
5288                 fillargs->event = RTM_NEWADDR;
5289
5290                 /* unicast address incl. temp addr */
5291                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
5292                         if (ip_idx < *s_ip_idx)
5293                                 goto next;
5294                         err = inet6_fill_ifaddr(skb, ifa, fillargs);
5295                         if (err < 0)
5296                                 break;
5297                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5298 next:
5299                         ip_idx++;
5300                 }
5301                 break;
5302         }
5303         case MULTICAST_ADDR:
5304                 fillargs->event = RTM_GETMULTICAST;
5305
5306                 /* multicast address */
5307                 for (ifmca = rcu_dereference(idev->mc_list);
5308                      ifmca;
5309                      ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5310                         if (ip_idx < *s_ip_idx)
5311                                 continue;
5312                         err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5313                         if (err < 0)
5314                                 break;
5315                 }
5316                 break;
5317         case ANYCAST_ADDR:
5318                 fillargs->event = RTM_GETANYCAST;
5319                 /* anycast address */
5320                 for (ifaca = rcu_dereference(idev->ac_list); ifaca;
5321                      ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
5322                         if (ip_idx < *s_ip_idx)
5323                                 continue;
5324                         err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5325                         if (err < 0)
5326                                 break;
5327                 }
5328                 break;
5329         default:
5330                 break;
5331         }
5332         *s_ip_idx = err ? ip_idx : 0;
5333         return err;
5334 }
5335
5336 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5337                                        struct inet6_fill_args *fillargs,
5338                                        struct net **tgt_net, struct sock *sk,
5339                                        struct netlink_callback *cb)
5340 {
5341         struct netlink_ext_ack *extack = cb->extack;
5342         struct nlattr *tb[IFA_MAX+1];
5343         struct ifaddrmsg *ifm;
5344         int err, i;
5345
5346         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5347                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5348                 return -EINVAL;
5349         }
5350
5351         ifm = nlmsg_data(nlh);
5352         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5353                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5354                 return -EINVAL;
5355         }
5356
5357         fillargs->ifindex = ifm->ifa_index;
5358         if (fillargs->ifindex) {
5359                 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5360                 fillargs->flags |= NLM_F_DUMP_FILTERED;
5361         }
5362
5363         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5364                                             ifa_ipv6_policy, extack);
5365         if (err < 0)
5366                 return err;
5367
5368         for (i = 0; i <= IFA_MAX; ++i) {
5369                 if (!tb[i])
5370                         continue;
5371
5372                 if (i == IFA_TARGET_NETNSID) {
5373                         struct net *net;
5374
5375                         fillargs->netnsid = nla_get_s32(tb[i]);
5376                         net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5377                         if (IS_ERR(net)) {
5378                                 fillargs->netnsid = -1;
5379                                 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5380                                 return PTR_ERR(net);
5381                         }
5382                         *tgt_net = net;
5383                 } else {
5384                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5385                         return -EINVAL;
5386                 }
5387         }
5388
5389         return 0;
5390 }
5391
5392 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5393                            enum addr_type_t type)
5394 {
5395         struct net *tgt_net = sock_net(skb->sk);
5396         const struct nlmsghdr *nlh = cb->nlh;
5397         struct inet6_fill_args fillargs = {
5398                 .portid = NETLINK_CB(cb->skb).portid,
5399                 .seq = cb->nlh->nlmsg_seq,
5400                 .flags = NLM_F_MULTI,
5401                 .netnsid = -1,
5402                 .type = type,
5403         };
5404         struct {
5405                 unsigned long ifindex;
5406                 int ip_idx;
5407         } *ctx = (void *)cb->ctx;
5408         struct net_device *dev;
5409         struct inet6_dev *idev;
5410         int err = 0;
5411
5412         rcu_read_lock();
5413         if (cb->strict_check) {
5414                 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5415                                                   skb->sk, cb);
5416                 if (err < 0)
5417                         goto done;
5418
5419                 err = 0;
5420                 if (fillargs.ifindex) {
5421                         dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
5422                         if (!dev) {
5423                                 err = -ENODEV;
5424                                 goto done;
5425                         }
5426                         idev = __in6_dev_get(dev);
5427                         if (idev)
5428                                 err = in6_dump_addrs(idev, skb, cb,
5429                                                      &ctx->ip_idx,
5430                                                      &fillargs);
5431                         goto done;
5432                 }
5433         }
5434
5435         cb->seq = inet6_base_seq(tgt_net);
5436         for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
5437                 idev = __in6_dev_get(dev);
5438                 if (!idev)
5439                         continue;
5440                 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
5441                                      &fillargs);
5442                 if (err < 0)
5443                         goto done;
5444         }
5445 done:
5446         rcu_read_unlock();
5447         if (fillargs.netnsid >= 0)
5448                 put_net(tgt_net);
5449
5450         return err;
5451 }
5452
5453 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5454 {
5455         enum addr_type_t type = UNICAST_ADDR;
5456
5457         return inet6_dump_addr(skb, cb, type);
5458 }
5459
5460 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5461 {
5462         enum addr_type_t type = MULTICAST_ADDR;
5463
5464         return inet6_dump_addr(skb, cb, type);
5465 }
5466
5467
5468 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5469 {
5470         enum addr_type_t type = ANYCAST_ADDR;
5471
5472         return inet6_dump_addr(skb, cb, type);
5473 }
5474
5475 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5476                                        const struct nlmsghdr *nlh,
5477                                        struct nlattr **tb,
5478                                        struct netlink_ext_ack *extack)
5479 {
5480         struct ifaddrmsg *ifm;
5481         int i, err;
5482
5483         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5484                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5485                 return -EINVAL;
5486         }
5487
5488         if (!netlink_strict_get_check(skb))
5489                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5490                                               ifa_ipv6_policy, extack);
5491
5492         ifm = nlmsg_data(nlh);
5493         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5494                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5495                 return -EINVAL;
5496         }
5497
5498         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5499                                             ifa_ipv6_policy, extack);
5500         if (err)
5501                 return err;
5502
5503         for (i = 0; i <= IFA_MAX; i++) {
5504                 if (!tb[i])
5505                         continue;
5506
5507                 switch (i) {
5508                 case IFA_TARGET_NETNSID:
5509                 case IFA_ADDRESS:
5510                 case IFA_LOCAL:
5511                         break;
5512                 default:
5513                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5514                         return -EINVAL;
5515                 }
5516         }
5517
5518         return 0;
5519 }
5520
5521 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5522                              struct netlink_ext_ack *extack)
5523 {
5524         struct net *tgt_net = sock_net(in_skb->sk);
5525         struct inet6_fill_args fillargs = {
5526                 .portid = NETLINK_CB(in_skb).portid,
5527                 .seq = nlh->nlmsg_seq,
5528                 .event = RTM_NEWADDR,
5529                 .flags = 0,
5530                 .netnsid = -1,
5531         };
5532         struct ifaddrmsg *ifm;
5533         struct nlattr *tb[IFA_MAX+1];
5534         struct in6_addr *addr = NULL, *peer;
5535         struct net_device *dev = NULL;
5536         struct inet6_ifaddr *ifa;
5537         struct sk_buff *skb;
5538         int err;
5539
5540         err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5541         if (err < 0)
5542                 return err;
5543
5544         if (tb[IFA_TARGET_NETNSID]) {
5545                 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5546
5547                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5548                                                   fillargs.netnsid);
5549                 if (IS_ERR(tgt_net))
5550                         return PTR_ERR(tgt_net);
5551         }
5552
5553         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5554         if (!addr) {
5555                 err = -EINVAL;
5556                 goto errout;
5557         }
5558         ifm = nlmsg_data(nlh);
5559         if (ifm->ifa_index)
5560                 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5561
5562         ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5563         if (!ifa) {
5564                 err = -EADDRNOTAVAIL;
5565                 goto errout;
5566         }
5567
5568         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5569         if (!skb) {
5570                 err = -ENOBUFS;
5571                 goto errout_ifa;
5572         }
5573
5574         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5575         if (err < 0) {
5576                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5577                 WARN_ON(err == -EMSGSIZE);
5578                 kfree_skb(skb);
5579                 goto errout_ifa;
5580         }
5581         err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5582 errout_ifa:
5583         in6_ifa_put(ifa);
5584 errout:
5585         dev_put(dev);
5586         if (fillargs.netnsid >= 0)
5587                 put_net(tgt_net);
5588
5589         return err;
5590 }
5591
5592 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5593 {
5594         struct sk_buff *skb;
5595         struct net *net = dev_net(ifa->idev->dev);
5596         struct inet6_fill_args fillargs = {
5597                 .portid = 0,
5598                 .seq = 0,
5599                 .event = event,
5600                 .flags = 0,
5601                 .netnsid = -1,
5602         };
5603         int err = -ENOBUFS;
5604
5605         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5606         if (!skb)
5607                 goto errout;
5608
5609         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5610         if (err < 0) {
5611                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5612                 WARN_ON(err == -EMSGSIZE);
5613                 kfree_skb(skb);
5614                 goto errout;
5615         }
5616         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5617         return;
5618 errout:
5619         if (err < 0)
5620                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5621 }
5622
5623 static void ipv6_store_devconf(const struct ipv6_devconf *cnf,
5624                                __s32 *array, int bytes)
5625 {
5626         BUG_ON(bytes < (DEVCONF_MAX * 4));
5627
5628         memset(array, 0, bytes);
5629         array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding);
5630         array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit);
5631         array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6);
5632         array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra);
5633         array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects);
5634         array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf);
5635         array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits);
5636         array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits);
5637         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5638                 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval));
5639         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5640                 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval));
5641         array[DEVCONF_RTR_SOLICIT_DELAY] =
5642                 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay));
5643         array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version);
5644         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5645                 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval));
5646         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5647                 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval));
5648         array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr);
5649         array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft);
5650         array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft);
5651         array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry);
5652         array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor);
5653         array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses);
5654         array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr);
5655         array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric);
5656         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] =
5657                 READ_ONCE(cnf->accept_ra_min_hop_limit);
5658         array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo);
5659 #ifdef CONFIG_IPV6_ROUTER_PREF
5660         array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref);
5661         array[DEVCONF_RTR_PROBE_INTERVAL] =
5662                 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval));
5663 #ifdef CONFIG_IPV6_ROUTE_INFO
5664         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] =
5665                 READ_ONCE(cnf->accept_ra_rt_info_min_plen);
5666         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] =
5667                 READ_ONCE(cnf->accept_ra_rt_info_max_plen);
5668 #endif
5669 #endif
5670         array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp);
5671         array[DEVCONF_ACCEPT_SOURCE_ROUTE] =
5672                 READ_ONCE(cnf->accept_source_route);
5673 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5674         array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad);
5675         array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic);
5676 #endif
5677 #ifdef CONFIG_IPV6_MROUTE
5678         array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5679 #endif
5680         array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6);
5681         array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad);
5682         array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao);
5683         array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify);
5684         array[DEVCONF_SUPPRESS_FRAG_NDISC] =
5685                 READ_ONCE(cnf->suppress_frag_ndisc);
5686         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] =
5687                 READ_ONCE(cnf->accept_ra_from_local);
5688         array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu);
5689         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] =
5690                 READ_ONCE(cnf->ignore_routes_with_linkdown);
5691         /* we omit DEVCONF_STABLE_SECRET for now */
5692         array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only);
5693         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] =
5694                 READ_ONCE(cnf->drop_unicast_in_l2_multicast);
5695         array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na);
5696         array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down);
5697         array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled);
5698 #ifdef CONFIG_IPV6_SEG6_HMAC
5699         array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac);
5700 #endif
5701         array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad);
5702         array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode);
5703         array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy);
5704         array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass);
5705         array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled);
5706         array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled);
5707         array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id);
5708         array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide);
5709         array[DEVCONF_NDISC_EVICT_NOCARRIER] =
5710                 READ_ONCE(cnf->ndisc_evict_nocarrier);
5711         array[DEVCONF_ACCEPT_UNTRACKED_NA] =
5712                 READ_ONCE(cnf->accept_untracked_na);
5713         array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft);
5714 }
5715
5716 static inline size_t inet6_ifla6_size(void)
5717 {
5718         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5719              + nla_total_size(sizeof(struct ifla_cacheinfo))
5720              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5721              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5722              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5723              + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5724              + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5725              + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5726              + 0;
5727 }
5728
5729 static inline size_t inet6_if_nlmsg_size(void)
5730 {
5731         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5732                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5733                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5734                + nla_total_size(4) /* IFLA_MTU */
5735                + nla_total_size(4) /* IFLA_LINK */
5736                + nla_total_size(1) /* IFLA_OPERSTATE */
5737                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5738 }
5739
5740 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5741                                         int bytes)
5742 {
5743         int i;
5744         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5745         BUG_ON(pad < 0);
5746
5747         /* Use put_unaligned() because stats may not be aligned for u64. */
5748         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5749         for (i = 1; i < ICMP6_MIB_MAX; i++)
5750                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5751
5752         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5753 }
5754
5755 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5756                                         int bytes, size_t syncpoff)
5757 {
5758         int i, c;
5759         u64 buff[IPSTATS_MIB_MAX];
5760         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5761
5762         BUG_ON(pad < 0);
5763
5764         memset(buff, 0, sizeof(buff));
5765         buff[0] = IPSTATS_MIB_MAX;
5766
5767         for_each_possible_cpu(c) {
5768                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5769                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5770         }
5771
5772         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5773         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5774 }
5775
5776 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5777                              int bytes)
5778 {
5779         switch (attrtype) {
5780         case IFLA_INET6_STATS:
5781                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5782                                      offsetof(struct ipstats_mib, syncp));
5783                 break;
5784         case IFLA_INET6_ICMP6STATS:
5785                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5786                 break;
5787         }
5788 }
5789
5790 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5791                                   u32 ext_filter_mask)
5792 {
5793         struct ifla_cacheinfo ci;
5794         struct nlattr *nla;
5795         u32 ra_mtu;
5796
5797         if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags)))
5798                 goto nla_put_failure;
5799         ci.max_reasm_len = IPV6_MAXPLEN;
5800         ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp));
5801         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5802         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5803         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5804                 goto nla_put_failure;
5805         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5806         if (!nla)
5807                 goto nla_put_failure;
5808         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5809
5810         /* XXX - MC not implemented */
5811
5812         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5813                 return 0;
5814
5815         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5816         if (!nla)
5817                 goto nla_put_failure;
5818         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5819
5820         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5821         if (!nla)
5822                 goto nla_put_failure;
5823         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5824
5825         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5826         if (!nla)
5827                 goto nla_put_failure;
5828         read_lock_bh(&idev->lock);
5829         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5830         read_unlock_bh(&idev->lock);
5831
5832         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE,
5833                        READ_ONCE(idev->cnf.addr_gen_mode)))
5834                 goto nla_put_failure;
5835
5836         ra_mtu = READ_ONCE(idev->ra_mtu);
5837         if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu))
5838                 goto nla_put_failure;
5839
5840         return 0;
5841
5842 nla_put_failure:
5843         return -EMSGSIZE;
5844 }
5845
5846 static size_t inet6_get_link_af_size(const struct net_device *dev,
5847                                      u32 ext_filter_mask)
5848 {
5849         if (!__in6_dev_get(dev))
5850                 return 0;
5851
5852         return inet6_ifla6_size();
5853 }
5854
5855 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5856                               u32 ext_filter_mask)
5857 {
5858         struct inet6_dev *idev = __in6_dev_get(dev);
5859
5860         if (!idev)
5861                 return -ENODATA;
5862
5863         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5864                 return -EMSGSIZE;
5865
5866         return 0;
5867 }
5868
5869 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5870                              struct netlink_ext_ack *extack)
5871 {
5872         struct inet6_ifaddr *ifp;
5873         struct net_device *dev = idev->dev;
5874         bool clear_token, update_rs = false;
5875         struct in6_addr ll_addr;
5876
5877         ASSERT_RTNL();
5878
5879         if (!token)
5880                 return -EINVAL;
5881
5882         if (dev->flags & IFF_LOOPBACK) {
5883                 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5884                 return -EINVAL;
5885         }
5886
5887         if (dev->flags & IFF_NOARP) {
5888                 NL_SET_ERR_MSG_MOD(extack,
5889                                    "Device does not do neighbour discovery");
5890                 return -EINVAL;
5891         }
5892
5893         if (!ipv6_accept_ra(idev)) {
5894                 NL_SET_ERR_MSG_MOD(extack,
5895                                    "Router advertisement is disabled on device");
5896                 return -EINVAL;
5897         }
5898
5899         if (READ_ONCE(idev->cnf.rtr_solicits) == 0) {
5900                 NL_SET_ERR_MSG(extack,
5901                                "Router solicitation is disabled on device");
5902                 return -EINVAL;
5903         }
5904
5905         write_lock_bh(&idev->lock);
5906
5907         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5908         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5909
5910         write_unlock_bh(&idev->lock);
5911
5912         clear_token = ipv6_addr_any(token);
5913         if (clear_token)
5914                 goto update_lft;
5915
5916         if (!idev->dead && (idev->if_flags & IF_READY) &&
5917             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5918                              IFA_F_OPTIMISTIC)) {
5919                 /* If we're not ready, then normal ifup will take care
5920                  * of this. Otherwise, we need to request our rs here.
5921                  */
5922                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5923                 update_rs = true;
5924         }
5925
5926 update_lft:
5927         write_lock_bh(&idev->lock);
5928
5929         if (update_rs) {
5930                 idev->if_flags |= IF_RS_SENT;
5931                 idev->rs_interval = rfc3315_s14_backoff_init(
5932                         READ_ONCE(idev->cnf.rtr_solicit_interval));
5933                 idev->rs_probes = 1;
5934                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5935         }
5936
5937         /* Well, that's kinda nasty ... */
5938         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5939                 spin_lock(&ifp->lock);
5940                 if (ifp->tokenized) {
5941                         ifp->valid_lft = 0;
5942                         ifp->prefered_lft = 0;
5943                 }
5944                 spin_unlock(&ifp->lock);
5945         }
5946
5947         write_unlock_bh(&idev->lock);
5948         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5949         addrconf_verify_rtnl(dev_net(dev));
5950         return 0;
5951 }
5952
5953 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5954         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5955         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5956         [IFLA_INET6_RA_MTU]             = { .type = NLA_REJECT,
5957                                             .reject_message =
5958                                                 "IFLA_INET6_RA_MTU can not be set" },
5959 };
5960
5961 static int check_addr_gen_mode(int mode)
5962 {
5963         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5964             mode != IN6_ADDR_GEN_MODE_NONE &&
5965             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5966             mode != IN6_ADDR_GEN_MODE_RANDOM)
5967                 return -EINVAL;
5968         return 1;
5969 }
5970
5971 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5972                                 int mode)
5973 {
5974         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5975             !idev->cnf.stable_secret.initialized &&
5976             !net->ipv6.devconf_dflt->stable_secret.initialized)
5977                 return -EINVAL;
5978         return 1;
5979 }
5980
5981 static int inet6_validate_link_af(const struct net_device *dev,
5982                                   const struct nlattr *nla,
5983                                   struct netlink_ext_ack *extack)
5984 {
5985         struct nlattr *tb[IFLA_INET6_MAX + 1];
5986         struct inet6_dev *idev = NULL;
5987         int err;
5988
5989         if (dev) {
5990                 idev = __in6_dev_get(dev);
5991                 if (!idev)
5992                         return -EAFNOSUPPORT;
5993         }
5994
5995         err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5996                                           inet6_af_policy, extack);
5997         if (err)
5998                 return err;
5999
6000         if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
6001                 return -EINVAL;
6002
6003         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6004                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6005
6006                 if (check_addr_gen_mode(mode) < 0)
6007                         return -EINVAL;
6008                 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
6009                         return -EINVAL;
6010         }
6011
6012         return 0;
6013 }
6014
6015 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
6016                              struct netlink_ext_ack *extack)
6017 {
6018         struct inet6_dev *idev = __in6_dev_get(dev);
6019         struct nlattr *tb[IFLA_INET6_MAX + 1];
6020         int err;
6021
6022         if (!idev)
6023                 return -EAFNOSUPPORT;
6024
6025         if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
6026                 return -EINVAL;
6027
6028         if (tb[IFLA_INET6_TOKEN]) {
6029                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
6030                                         extack);
6031                 if (err)
6032                         return err;
6033         }
6034
6035         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6036                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6037
6038                 WRITE_ONCE(idev->cnf.addr_gen_mode, mode);
6039         }
6040
6041         return 0;
6042 }
6043
6044 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
6045                              u32 portid, u32 seq, int event, unsigned int flags)
6046 {
6047         struct net_device *dev = idev->dev;
6048         struct ifinfomsg *hdr;
6049         struct nlmsghdr *nlh;
6050         int ifindex, iflink;
6051         void *protoinfo;
6052
6053         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
6054         if (!nlh)
6055                 return -EMSGSIZE;
6056
6057         hdr = nlmsg_data(nlh);
6058         hdr->ifi_family = AF_INET6;
6059         hdr->__ifi_pad = 0;
6060         hdr->ifi_type = dev->type;
6061         ifindex = READ_ONCE(dev->ifindex);
6062         hdr->ifi_index = ifindex;
6063         hdr->ifi_flags = dev_get_flags(dev);
6064         hdr->ifi_change = 0;
6065
6066         iflink = dev_get_iflink(dev);
6067         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
6068             (dev->addr_len &&
6069              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
6070             nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) ||
6071             (ifindex != iflink &&
6072              nla_put_u32(skb, IFLA_LINK, iflink)) ||
6073             nla_put_u8(skb, IFLA_OPERSTATE,
6074                        netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6075                 goto nla_put_failure;
6076         protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6077         if (!protoinfo)
6078                 goto nla_put_failure;
6079
6080         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6081                 goto nla_put_failure;
6082
6083         nla_nest_end(skb, protoinfo);
6084         nlmsg_end(skb, nlh);
6085         return 0;
6086
6087 nla_put_failure:
6088         nlmsg_cancel(skb, nlh);
6089         return -EMSGSIZE;
6090 }
6091
6092 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6093                                    struct netlink_ext_ack *extack)
6094 {
6095         struct ifinfomsg *ifm;
6096
6097         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6098                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6099                 return -EINVAL;
6100         }
6101
6102         if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6103                 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6104                 return -EINVAL;
6105         }
6106
6107         ifm = nlmsg_data(nlh);
6108         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6109             ifm->ifi_change || ifm->ifi_index) {
6110                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6111                 return -EINVAL;
6112         }
6113
6114         return 0;
6115 }
6116
6117 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6118 {
6119         struct net *net = sock_net(skb->sk);
6120         struct {
6121                 unsigned long ifindex;
6122         } *ctx = (void *)cb->ctx;
6123         struct net_device *dev;
6124         struct inet6_dev *idev;
6125         int err;
6126
6127         /* only requests using strict checking can pass data to
6128          * influence the dump
6129          */
6130         if (cb->strict_check) {
6131                 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6132
6133                 if (err < 0)
6134                         return err;
6135         }
6136
6137         err = 0;
6138         rcu_read_lock();
6139         for_each_netdev_dump(net, dev, ctx->ifindex) {
6140                 idev = __in6_dev_get(dev);
6141                 if (!idev)
6142                         continue;
6143                 err = inet6_fill_ifinfo(skb, idev,
6144                                         NETLINK_CB(cb->skb).portid,
6145                                         cb->nlh->nlmsg_seq,
6146                                         RTM_NEWLINK, NLM_F_MULTI);
6147                 if (err < 0)
6148                         break;
6149         }
6150         rcu_read_unlock();
6151
6152         return err;
6153 }
6154
6155 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6156 {
6157         struct sk_buff *skb;
6158         struct net *net = dev_net(idev->dev);
6159         int err = -ENOBUFS;
6160
6161         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6162         if (!skb)
6163                 goto errout;
6164
6165         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6166         if (err < 0) {
6167                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6168                 WARN_ON(err == -EMSGSIZE);
6169                 kfree_skb(skb);
6170                 goto errout;
6171         }
6172         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6173         return;
6174 errout:
6175         if (err < 0)
6176                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6177 }
6178
6179 static inline size_t inet6_prefix_nlmsg_size(void)
6180 {
6181         return NLMSG_ALIGN(sizeof(struct prefixmsg))
6182                + nla_total_size(sizeof(struct in6_addr))
6183                + nla_total_size(sizeof(struct prefix_cacheinfo));
6184 }
6185
6186 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6187                              struct prefix_info *pinfo, u32 portid, u32 seq,
6188                              int event, unsigned int flags)
6189 {
6190         struct prefixmsg *pmsg;
6191         struct nlmsghdr *nlh;
6192         struct prefix_cacheinfo ci;
6193
6194         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6195         if (!nlh)
6196                 return -EMSGSIZE;
6197
6198         pmsg = nlmsg_data(nlh);
6199         pmsg->prefix_family = AF_INET6;
6200         pmsg->prefix_pad1 = 0;
6201         pmsg->prefix_pad2 = 0;
6202         pmsg->prefix_ifindex = idev->dev->ifindex;
6203         pmsg->prefix_len = pinfo->prefix_len;
6204         pmsg->prefix_type = pinfo->type;
6205         pmsg->prefix_pad3 = 0;
6206         pmsg->prefix_flags = pinfo->flags;
6207
6208         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6209                 goto nla_put_failure;
6210         ci.preferred_time = ntohl(pinfo->prefered);
6211         ci.valid_time = ntohl(pinfo->valid);
6212         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6213                 goto nla_put_failure;
6214         nlmsg_end(skb, nlh);
6215         return 0;
6216
6217 nla_put_failure:
6218         nlmsg_cancel(skb, nlh);
6219         return -EMSGSIZE;
6220 }
6221
6222 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6223                          struct prefix_info *pinfo)
6224 {
6225         struct sk_buff *skb;
6226         struct net *net = dev_net(idev->dev);
6227         int err = -ENOBUFS;
6228
6229         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6230         if (!skb)
6231                 goto errout;
6232
6233         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6234         if (err < 0) {
6235                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6236                 WARN_ON(err == -EMSGSIZE);
6237                 kfree_skb(skb);
6238                 goto errout;
6239         }
6240         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6241         return;
6242 errout:
6243         if (err < 0)
6244                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6245 }
6246
6247 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6248 {
6249         struct net *net = dev_net(ifp->idev->dev);
6250
6251         if (event)
6252                 ASSERT_RTNL();
6253
6254         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6255
6256         switch (event) {
6257         case RTM_NEWADDR:
6258                 /*
6259                  * If the address was optimistic we inserted the route at the
6260                  * start of our DAD process, so we don't need to do it again.
6261                  * If the device was taken down in the middle of the DAD
6262                  * cycle there is a race where we could get here without a
6263                  * host route, so nothing to insert. That will be fixed when
6264                  * the device is brought up.
6265                  */
6266                 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6267                         ip6_ins_rt(net, ifp->rt);
6268                 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6269                         pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6270                                 &ifp->addr, ifp->idev->dev->name);
6271                 }
6272
6273                 if (ifp->idev->cnf.forwarding)
6274                         addrconf_join_anycast(ifp);
6275                 if (!ipv6_addr_any(&ifp->peer_addr))
6276                         addrconf_prefix_route(&ifp->peer_addr, 128,
6277                                               ifp->rt_priority, ifp->idev->dev,
6278                                               0, 0, GFP_ATOMIC);
6279                 break;
6280         case RTM_DELADDR:
6281                 if (ifp->idev->cnf.forwarding)
6282                         addrconf_leave_anycast(ifp);
6283                 addrconf_leave_solict(ifp->idev, &ifp->addr);
6284                 if (!ipv6_addr_any(&ifp->peer_addr)) {
6285                         struct fib6_info *rt;
6286
6287                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6288                                                        ifp->idev->dev, 0, 0,
6289                                                        false);
6290                         if (rt)
6291                                 ip6_del_rt(net, rt, false);
6292                 }
6293                 if (ifp->rt) {
6294                         ip6_del_rt(net, ifp->rt, false);
6295                         ifp->rt = NULL;
6296                 }
6297                 rt_genid_bump_ipv6(net);
6298                 break;
6299         }
6300         atomic_inc(&net->ipv6.dev_addr_genid);
6301 }
6302
6303 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6304 {
6305         if (likely(ifp->idev->dead == 0))
6306                 __ipv6_ifa_notify(event, ifp);
6307 }
6308
6309 #ifdef CONFIG_SYSCTL
6310
6311 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6312                 void *buffer, size_t *lenp, loff_t *ppos)
6313 {
6314         int *valp = ctl->data;
6315         int val = *valp;
6316         loff_t pos = *ppos;
6317         struct ctl_table lctl;
6318         int ret;
6319
6320         /*
6321          * ctl->data points to idev->cnf.forwarding, we should
6322          * not modify it until we get the rtnl lock.
6323          */
6324         lctl = *ctl;
6325         lctl.data = &val;
6326
6327         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6328
6329         if (write)
6330                 ret = addrconf_fixup_forwarding(ctl, valp, val);
6331         if (ret)
6332                 *ppos = pos;
6333         return ret;
6334 }
6335
6336 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6337                 void *buffer, size_t *lenp, loff_t *ppos)
6338 {
6339         struct inet6_dev *idev = ctl->extra1;
6340         int min_mtu = IPV6_MIN_MTU;
6341         struct ctl_table lctl;
6342
6343         lctl = *ctl;
6344         lctl.extra1 = &min_mtu;
6345         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6346
6347         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6348 }
6349
6350 static void dev_disable_change(struct inet6_dev *idev)
6351 {
6352         struct netdev_notifier_info info;
6353
6354         if (!idev || !idev->dev)
6355                 return;
6356
6357         netdev_notifier_info_init(&info, idev->dev);
6358         if (idev->cnf.disable_ipv6)
6359                 addrconf_notify(NULL, NETDEV_DOWN, &info);
6360         else
6361                 addrconf_notify(NULL, NETDEV_UP, &info);
6362 }
6363
6364 static void addrconf_disable_change(struct net *net, __s32 newf)
6365 {
6366         struct net_device *dev;
6367         struct inet6_dev *idev;
6368
6369         for_each_netdev(net, dev) {
6370                 idev = __in6_dev_get(dev);
6371                 if (idev) {
6372                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6373
6374                         WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6375                         if (changed)
6376                                 dev_disable_change(idev);
6377                 }
6378         }
6379 }
6380
6381 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6382 {
6383         struct net *net = (struct net *)table->extra2;
6384         int old;
6385
6386         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6387                 WRITE_ONCE(*p, newf);
6388                 return 0;
6389         }
6390
6391         if (!rtnl_trylock())
6392                 return restart_syscall();
6393
6394         old = *p;
6395         WRITE_ONCE(*p, newf);
6396
6397         if (p == &net->ipv6.devconf_all->disable_ipv6) {
6398                 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6399                 addrconf_disable_change(net, newf);
6400         } else if ((!newf) ^ (!old))
6401                 dev_disable_change((struct inet6_dev *)table->extra1);
6402
6403         rtnl_unlock();
6404         return 0;
6405 }
6406
6407 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6408                 void *buffer, size_t *lenp, loff_t *ppos)
6409 {
6410         int *valp = ctl->data;
6411         int val = *valp;
6412         loff_t pos = *ppos;
6413         struct ctl_table lctl;
6414         int ret;
6415
6416         /*
6417          * ctl->data points to idev->cnf.disable_ipv6, we should
6418          * not modify it until we get the rtnl lock.
6419          */
6420         lctl = *ctl;
6421         lctl.data = &val;
6422
6423         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6424
6425         if (write)
6426                 ret = addrconf_disable_ipv6(ctl, valp, val);
6427         if (ret)
6428                 *ppos = pos;
6429         return ret;
6430 }
6431
6432 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6433                 void *buffer, size_t *lenp, loff_t *ppos)
6434 {
6435         int *valp = ctl->data;
6436         int ret;
6437         int old, new;
6438
6439         old = *valp;
6440         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6441         new = *valp;
6442
6443         if (write && old != new) {
6444                 struct net *net = ctl->extra2;
6445
6446                 if (!rtnl_trylock())
6447                         return restart_syscall();
6448
6449                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6450                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6451                                                      NETCONFA_PROXY_NEIGH,
6452                                                      NETCONFA_IFINDEX_DEFAULT,
6453                                                      net->ipv6.devconf_dflt);
6454                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6455                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6456                                                      NETCONFA_PROXY_NEIGH,
6457                                                      NETCONFA_IFINDEX_ALL,
6458                                                      net->ipv6.devconf_all);
6459                 else {
6460                         struct inet6_dev *idev = ctl->extra1;
6461
6462                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6463                                                      NETCONFA_PROXY_NEIGH,
6464                                                      idev->dev->ifindex,
6465                                                      &idev->cnf);
6466                 }
6467                 rtnl_unlock();
6468         }
6469
6470         return ret;
6471 }
6472
6473 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6474                                          void *buffer, size_t *lenp,
6475                                          loff_t *ppos)
6476 {
6477         int ret = 0;
6478         u32 new_val;
6479         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6480         struct net *net = (struct net *)ctl->extra2;
6481         struct ctl_table tmp = {
6482                 .data = &new_val,
6483                 .maxlen = sizeof(new_val),
6484                 .mode = ctl->mode,
6485         };
6486
6487         if (!rtnl_trylock())
6488                 return restart_syscall();
6489
6490         new_val = *((u32 *)ctl->data);
6491
6492         ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6493         if (ret != 0)
6494                 goto out;
6495
6496         if (write) {
6497                 if (check_addr_gen_mode(new_val) < 0) {
6498                         ret = -EINVAL;
6499                         goto out;
6500                 }
6501
6502                 if (idev) {
6503                         if (check_stable_privacy(idev, net, new_val) < 0) {
6504                                 ret = -EINVAL;
6505                                 goto out;
6506                         }
6507
6508                         if (idev->cnf.addr_gen_mode != new_val) {
6509                                 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val);
6510                                 addrconf_init_auto_addrs(idev->dev);
6511                         }
6512                 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6513                         struct net_device *dev;
6514
6515                         WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val);
6516                         for_each_netdev(net, dev) {
6517                                 idev = __in6_dev_get(dev);
6518                                 if (idev &&
6519                                     idev->cnf.addr_gen_mode != new_val) {
6520                                         WRITE_ONCE(idev->cnf.addr_gen_mode,
6521                                                   new_val);
6522                                         addrconf_init_auto_addrs(idev->dev);
6523                                 }
6524                         }
6525                 }
6526
6527                 WRITE_ONCE(*((u32 *)ctl->data), new_val);
6528         }
6529
6530 out:
6531         rtnl_unlock();
6532
6533         return ret;
6534 }
6535
6536 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6537                                          void *buffer, size_t *lenp,
6538                                          loff_t *ppos)
6539 {
6540         int err;
6541         struct in6_addr addr;
6542         char str[IPV6_MAX_STRLEN];
6543         struct ctl_table lctl = *ctl;
6544         struct net *net = ctl->extra2;
6545         struct ipv6_stable_secret *secret = ctl->data;
6546
6547         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6548                 return -EIO;
6549
6550         lctl.maxlen = IPV6_MAX_STRLEN;
6551         lctl.data = str;
6552
6553         if (!rtnl_trylock())
6554                 return restart_syscall();
6555
6556         if (!write && !secret->initialized) {
6557                 err = -EIO;
6558                 goto out;
6559         }
6560
6561         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6562         if (err >= sizeof(str)) {
6563                 err = -EIO;
6564                 goto out;
6565         }
6566
6567         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6568         if (err || !write)
6569                 goto out;
6570
6571         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6572                 err = -EIO;
6573                 goto out;
6574         }
6575
6576         secret->initialized = true;
6577         secret->secret = addr;
6578
6579         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6580                 struct net_device *dev;
6581
6582                 for_each_netdev(net, dev) {
6583                         struct inet6_dev *idev = __in6_dev_get(dev);
6584
6585                         if (idev) {
6586                                 WRITE_ONCE(idev->cnf.addr_gen_mode,
6587                                            IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6588                         }
6589                 }
6590         } else {
6591                 struct inet6_dev *idev = ctl->extra1;
6592
6593                 WRITE_ONCE(idev->cnf.addr_gen_mode,
6594                            IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6595         }
6596
6597 out:
6598         rtnl_unlock();
6599
6600         return err;
6601 }
6602
6603 static
6604 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6605                                                 int write, void *buffer,
6606                                                 size_t *lenp,
6607                                                 loff_t *ppos)
6608 {
6609         int *valp = ctl->data;
6610         int val = *valp;
6611         loff_t pos = *ppos;
6612         struct ctl_table lctl;
6613         int ret;
6614
6615         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6616          * we should not modify it until we get the rtnl lock.
6617          */
6618         lctl = *ctl;
6619         lctl.data = &val;
6620
6621         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6622
6623         if (write)
6624                 ret = addrconf_fixup_linkdown(ctl, valp, val);
6625         if (ret)
6626                 *ppos = pos;
6627         return ret;
6628 }
6629
6630 static
6631 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6632 {
6633         if (rt) {
6634                 if (action)
6635                         rt->dst.flags |= DST_NOPOLICY;
6636                 else
6637                         rt->dst.flags &= ~DST_NOPOLICY;
6638         }
6639 }
6640
6641 static
6642 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6643 {
6644         struct inet6_ifaddr *ifa;
6645
6646         read_lock_bh(&idev->lock);
6647         list_for_each_entry(ifa, &idev->addr_list, if_list) {
6648                 spin_lock(&ifa->lock);
6649                 if (ifa->rt) {
6650                         /* host routes only use builtin fib6_nh */
6651                         struct fib6_nh *nh = ifa->rt->fib6_nh;
6652                         int cpu;
6653
6654                         rcu_read_lock();
6655                         ifa->rt->dst_nopolicy = val ? true : false;
6656                         if (nh->rt6i_pcpu) {
6657                                 for_each_possible_cpu(cpu) {
6658                                         struct rt6_info **rtp;
6659
6660                                         rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6661                                         addrconf_set_nopolicy(*rtp, val);
6662                                 }
6663                         }
6664                         rcu_read_unlock();
6665                 }
6666                 spin_unlock(&ifa->lock);
6667         }
6668         read_unlock_bh(&idev->lock);
6669 }
6670
6671 static
6672 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6673 {
6674         struct net *net = (struct net *)ctl->extra2;
6675         struct inet6_dev *idev;
6676
6677         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6678                 WRITE_ONCE(*valp, val);
6679                 return 0;
6680         }
6681
6682         if (!rtnl_trylock())
6683                 return restart_syscall();
6684
6685         WRITE_ONCE(*valp, val);
6686
6687         if (valp == &net->ipv6.devconf_all->disable_policy)  {
6688                 struct net_device *dev;
6689
6690                 for_each_netdev(net, dev) {
6691                         idev = __in6_dev_get(dev);
6692                         if (idev)
6693                                 addrconf_disable_policy_idev(idev, val);
6694                 }
6695         } else {
6696                 idev = (struct inet6_dev *)ctl->extra1;
6697                 addrconf_disable_policy_idev(idev, val);
6698         }
6699
6700         rtnl_unlock();
6701         return 0;
6702 }
6703
6704 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6705                                    void *buffer, size_t *lenp, loff_t *ppos)
6706 {
6707         int *valp = ctl->data;
6708         int val = *valp;
6709         loff_t pos = *ppos;
6710         struct ctl_table lctl;
6711         int ret;
6712
6713         lctl = *ctl;
6714         lctl.data = &val;
6715         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6716
6717         if (write && (*valp != val))
6718                 ret = addrconf_disable_policy(ctl, valp, val);
6719
6720         if (ret)
6721                 *ppos = pos;
6722
6723         return ret;
6724 }
6725
6726 static int minus_one = -1;
6727 static const int two_five_five = 255;
6728 static u32 ioam6_if_id_max = U16_MAX;
6729
6730 static const struct ctl_table addrconf_sysctl[] = {
6731         {
6732                 .procname       = "forwarding",
6733                 .data           = &ipv6_devconf.forwarding,
6734                 .maxlen         = sizeof(int),
6735                 .mode           = 0644,
6736                 .proc_handler   = addrconf_sysctl_forward,
6737         },
6738         {
6739                 .procname       = "hop_limit",
6740                 .data           = &ipv6_devconf.hop_limit,
6741                 .maxlen         = sizeof(int),
6742                 .mode           = 0644,
6743                 .proc_handler   = proc_dointvec_minmax,
6744                 .extra1         = (void *)SYSCTL_ONE,
6745                 .extra2         = (void *)&two_five_five,
6746         },
6747         {
6748                 .procname       = "mtu",
6749                 .data           = &ipv6_devconf.mtu6,
6750                 .maxlen         = sizeof(int),
6751                 .mode           = 0644,
6752                 .proc_handler   = addrconf_sysctl_mtu,
6753         },
6754         {
6755                 .procname       = "accept_ra",
6756                 .data           = &ipv6_devconf.accept_ra,
6757                 .maxlen         = sizeof(int),
6758                 .mode           = 0644,
6759                 .proc_handler   = proc_dointvec,
6760         },
6761         {
6762                 .procname       = "accept_redirects",
6763                 .data           = &ipv6_devconf.accept_redirects,
6764                 .maxlen         = sizeof(int),
6765                 .mode           = 0644,
6766                 .proc_handler   = proc_dointvec,
6767         },
6768         {
6769                 .procname       = "autoconf",
6770                 .data           = &ipv6_devconf.autoconf,
6771                 .maxlen         = sizeof(int),
6772                 .mode           = 0644,
6773                 .proc_handler   = proc_dointvec,
6774         },
6775         {
6776                 .procname       = "dad_transmits",
6777                 .data           = &ipv6_devconf.dad_transmits,
6778                 .maxlen         = sizeof(int),
6779                 .mode           = 0644,
6780                 .proc_handler   = proc_dointvec,
6781         },
6782         {
6783                 .procname       = "router_solicitations",
6784                 .data           = &ipv6_devconf.rtr_solicits,
6785                 .maxlen         = sizeof(int),
6786                 .mode           = 0644,
6787                 .proc_handler   = proc_dointvec_minmax,
6788                 .extra1         = &minus_one,
6789         },
6790         {
6791                 .procname       = "router_solicitation_interval",
6792                 .data           = &ipv6_devconf.rtr_solicit_interval,
6793                 .maxlen         = sizeof(int),
6794                 .mode           = 0644,
6795                 .proc_handler   = proc_dointvec_jiffies,
6796         },
6797         {
6798                 .procname       = "router_solicitation_max_interval",
6799                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6800                 .maxlen         = sizeof(int),
6801                 .mode           = 0644,
6802                 .proc_handler   = proc_dointvec_jiffies,
6803         },
6804         {
6805                 .procname       = "router_solicitation_delay",
6806                 .data           = &ipv6_devconf.rtr_solicit_delay,
6807                 .maxlen         = sizeof(int),
6808                 .mode           = 0644,
6809                 .proc_handler   = proc_dointvec_jiffies,
6810         },
6811         {
6812                 .procname       = "force_mld_version",
6813                 .data           = &ipv6_devconf.force_mld_version,
6814                 .maxlen         = sizeof(int),
6815                 .mode           = 0644,
6816                 .proc_handler   = proc_dointvec,
6817         },
6818         {
6819                 .procname       = "mldv1_unsolicited_report_interval",
6820                 .data           =
6821                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6822                 .maxlen         = sizeof(int),
6823                 .mode           = 0644,
6824                 .proc_handler   = proc_dointvec_ms_jiffies,
6825         },
6826         {
6827                 .procname       = "mldv2_unsolicited_report_interval",
6828                 .data           =
6829                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6830                 .maxlen         = sizeof(int),
6831                 .mode           = 0644,
6832                 .proc_handler   = proc_dointvec_ms_jiffies,
6833         },
6834         {
6835                 .procname       = "use_tempaddr",
6836                 .data           = &ipv6_devconf.use_tempaddr,
6837                 .maxlen         = sizeof(int),
6838                 .mode           = 0644,
6839                 .proc_handler   = proc_dointvec,
6840         },
6841         {
6842                 .procname       = "temp_valid_lft",
6843                 .data           = &ipv6_devconf.temp_valid_lft,
6844                 .maxlen         = sizeof(int),
6845                 .mode           = 0644,
6846                 .proc_handler   = proc_dointvec,
6847         },
6848         {
6849                 .procname       = "temp_prefered_lft",
6850                 .data           = &ipv6_devconf.temp_prefered_lft,
6851                 .maxlen         = sizeof(int),
6852                 .mode           = 0644,
6853                 .proc_handler   = proc_dointvec,
6854         },
6855         {
6856                 .procname       = "regen_min_advance",
6857                 .data           = &ipv6_devconf.regen_min_advance,
6858                 .maxlen         = sizeof(int),
6859                 .mode           = 0644,
6860                 .proc_handler   = proc_dointvec,
6861         },
6862         {
6863                 .procname       = "regen_max_retry",
6864                 .data           = &ipv6_devconf.regen_max_retry,
6865                 .maxlen         = sizeof(int),
6866                 .mode           = 0644,
6867                 .proc_handler   = proc_dointvec,
6868         },
6869         {
6870                 .procname       = "max_desync_factor",
6871                 .data           = &ipv6_devconf.max_desync_factor,
6872                 .maxlen         = sizeof(int),
6873                 .mode           = 0644,
6874                 .proc_handler   = proc_dointvec,
6875         },
6876         {
6877                 .procname       = "max_addresses",
6878                 .data           = &ipv6_devconf.max_addresses,
6879                 .maxlen         = sizeof(int),
6880                 .mode           = 0644,
6881                 .proc_handler   = proc_dointvec,
6882         },
6883         {
6884                 .procname       = "accept_ra_defrtr",
6885                 .data           = &ipv6_devconf.accept_ra_defrtr,
6886                 .maxlen         = sizeof(int),
6887                 .mode           = 0644,
6888                 .proc_handler   = proc_dointvec,
6889         },
6890         {
6891                 .procname       = "ra_defrtr_metric",
6892                 .data           = &ipv6_devconf.ra_defrtr_metric,
6893                 .maxlen         = sizeof(u32),
6894                 .mode           = 0644,
6895                 .proc_handler   = proc_douintvec_minmax,
6896                 .extra1         = (void *)SYSCTL_ONE,
6897         },
6898         {
6899                 .procname       = "accept_ra_min_hop_limit",
6900                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6901                 .maxlen         = sizeof(int),
6902                 .mode           = 0644,
6903                 .proc_handler   = proc_dointvec,
6904         },
6905         {
6906                 .procname       = "accept_ra_min_lft",
6907                 .data           = &ipv6_devconf.accept_ra_min_lft,
6908                 .maxlen         = sizeof(int),
6909                 .mode           = 0644,
6910                 .proc_handler   = proc_dointvec,
6911         },
6912         {
6913                 .procname       = "accept_ra_pinfo",
6914                 .data           = &ipv6_devconf.accept_ra_pinfo,
6915                 .maxlen         = sizeof(int),
6916                 .mode           = 0644,
6917                 .proc_handler   = proc_dointvec,
6918         },
6919         {
6920                 .procname       = "ra_honor_pio_life",
6921                 .data           = &ipv6_devconf.ra_honor_pio_life,
6922                 .maxlen         = sizeof(u8),
6923                 .mode           = 0644,
6924                 .proc_handler   = proc_dou8vec_minmax,
6925                 .extra1         = SYSCTL_ZERO,
6926                 .extra2         = SYSCTL_ONE,
6927         },
6928 #ifdef CONFIG_IPV6_ROUTER_PREF
6929         {
6930                 .procname       = "accept_ra_rtr_pref",
6931                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6932                 .maxlen         = sizeof(int),
6933                 .mode           = 0644,
6934                 .proc_handler   = proc_dointvec,
6935         },
6936         {
6937                 .procname       = "router_probe_interval",
6938                 .data           = &ipv6_devconf.rtr_probe_interval,
6939                 .maxlen         = sizeof(int),
6940                 .mode           = 0644,
6941                 .proc_handler   = proc_dointvec_jiffies,
6942         },
6943 #ifdef CONFIG_IPV6_ROUTE_INFO
6944         {
6945                 .procname       = "accept_ra_rt_info_min_plen",
6946                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6947                 .maxlen         = sizeof(int),
6948                 .mode           = 0644,
6949                 .proc_handler   = proc_dointvec,
6950         },
6951         {
6952                 .procname       = "accept_ra_rt_info_max_plen",
6953                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6954                 .maxlen         = sizeof(int),
6955                 .mode           = 0644,
6956                 .proc_handler   = proc_dointvec,
6957         },
6958 #endif
6959 #endif
6960         {
6961                 .procname       = "proxy_ndp",
6962                 .data           = &ipv6_devconf.proxy_ndp,
6963                 .maxlen         = sizeof(int),
6964                 .mode           = 0644,
6965                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6966         },
6967         {
6968                 .procname       = "accept_source_route",
6969                 .data           = &ipv6_devconf.accept_source_route,
6970                 .maxlen         = sizeof(int),
6971                 .mode           = 0644,
6972                 .proc_handler   = proc_dointvec,
6973         },
6974 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6975         {
6976                 .procname       = "optimistic_dad",
6977                 .data           = &ipv6_devconf.optimistic_dad,
6978                 .maxlen         = sizeof(int),
6979                 .mode           = 0644,
6980                 .proc_handler   = proc_dointvec,
6981         },
6982         {
6983                 .procname       = "use_optimistic",
6984                 .data           = &ipv6_devconf.use_optimistic,
6985                 .maxlen         = sizeof(int),
6986                 .mode           = 0644,
6987                 .proc_handler   = proc_dointvec,
6988         },
6989 #endif
6990 #ifdef CONFIG_IPV6_MROUTE
6991         {
6992                 .procname       = "mc_forwarding",
6993                 .data           = &ipv6_devconf.mc_forwarding,
6994                 .maxlen         = sizeof(int),
6995                 .mode           = 0444,
6996                 .proc_handler   = proc_dointvec,
6997         },
6998 #endif
6999         {
7000                 .procname       = "disable_ipv6",
7001                 .data           = &ipv6_devconf.disable_ipv6,
7002                 .maxlen         = sizeof(int),
7003                 .mode           = 0644,
7004                 .proc_handler   = addrconf_sysctl_disable,
7005         },
7006         {
7007                 .procname       = "accept_dad",
7008                 .data           = &ipv6_devconf.accept_dad,
7009                 .maxlen         = sizeof(int),
7010                 .mode           = 0644,
7011                 .proc_handler   = proc_dointvec,
7012         },
7013         {
7014                 .procname       = "force_tllao",
7015                 .data           = &ipv6_devconf.force_tllao,
7016                 .maxlen         = sizeof(int),
7017                 .mode           = 0644,
7018                 .proc_handler   = proc_dointvec
7019         },
7020         {
7021                 .procname       = "ndisc_notify",
7022                 .data           = &ipv6_devconf.ndisc_notify,
7023                 .maxlen         = sizeof(int),
7024                 .mode           = 0644,
7025                 .proc_handler   = proc_dointvec
7026         },
7027         {
7028                 .procname       = "suppress_frag_ndisc",
7029                 .data           = &ipv6_devconf.suppress_frag_ndisc,
7030                 .maxlen         = sizeof(int),
7031                 .mode           = 0644,
7032                 .proc_handler   = proc_dointvec
7033         },
7034         {
7035                 .procname       = "accept_ra_from_local",
7036                 .data           = &ipv6_devconf.accept_ra_from_local,
7037                 .maxlen         = sizeof(int),
7038                 .mode           = 0644,
7039                 .proc_handler   = proc_dointvec,
7040         },
7041         {
7042                 .procname       = "accept_ra_mtu",
7043                 .data           = &ipv6_devconf.accept_ra_mtu,
7044                 .maxlen         = sizeof(int),
7045                 .mode           = 0644,
7046                 .proc_handler   = proc_dointvec,
7047         },
7048         {
7049                 .procname       = "stable_secret",
7050                 .data           = &ipv6_devconf.stable_secret,
7051                 .maxlen         = IPV6_MAX_STRLEN,
7052                 .mode           = 0600,
7053                 .proc_handler   = addrconf_sysctl_stable_secret,
7054         },
7055         {
7056                 .procname       = "use_oif_addrs_only",
7057                 .data           = &ipv6_devconf.use_oif_addrs_only,
7058                 .maxlen         = sizeof(int),
7059                 .mode           = 0644,
7060                 .proc_handler   = proc_dointvec,
7061         },
7062         {
7063                 .procname       = "ignore_routes_with_linkdown",
7064                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
7065                 .maxlen         = sizeof(int),
7066                 .mode           = 0644,
7067                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
7068         },
7069         {
7070                 .procname       = "drop_unicast_in_l2_multicast",
7071                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
7072                 .maxlen         = sizeof(int),
7073                 .mode           = 0644,
7074                 .proc_handler   = proc_dointvec,
7075         },
7076         {
7077                 .procname       = "drop_unsolicited_na",
7078                 .data           = &ipv6_devconf.drop_unsolicited_na,
7079                 .maxlen         = sizeof(int),
7080                 .mode           = 0644,
7081                 .proc_handler   = proc_dointvec,
7082         },
7083         {
7084                 .procname       = "keep_addr_on_down",
7085                 .data           = &ipv6_devconf.keep_addr_on_down,
7086                 .maxlen         = sizeof(int),
7087                 .mode           = 0644,
7088                 .proc_handler   = proc_dointvec,
7089
7090         },
7091         {
7092                 .procname       = "seg6_enabled",
7093                 .data           = &ipv6_devconf.seg6_enabled,
7094                 .maxlen         = sizeof(int),
7095                 .mode           = 0644,
7096                 .proc_handler   = proc_dointvec,
7097         },
7098 #ifdef CONFIG_IPV6_SEG6_HMAC
7099         {
7100                 .procname       = "seg6_require_hmac",
7101                 .data           = &ipv6_devconf.seg6_require_hmac,
7102                 .maxlen         = sizeof(int),
7103                 .mode           = 0644,
7104                 .proc_handler   = proc_dointvec,
7105         },
7106 #endif
7107         {
7108                 .procname       = "enhanced_dad",
7109                 .data           = &ipv6_devconf.enhanced_dad,
7110                 .maxlen         = sizeof(int),
7111                 .mode           = 0644,
7112                 .proc_handler   = proc_dointvec,
7113         },
7114         {
7115                 .procname       = "addr_gen_mode",
7116                 .data           = &ipv6_devconf.addr_gen_mode,
7117                 .maxlen         = sizeof(int),
7118                 .mode           = 0644,
7119                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
7120         },
7121         {
7122                 .procname       = "disable_policy",
7123                 .data           = &ipv6_devconf.disable_policy,
7124                 .maxlen         = sizeof(int),
7125                 .mode           = 0644,
7126                 .proc_handler   = addrconf_sysctl_disable_policy,
7127         },
7128         {
7129                 .procname       = "ndisc_tclass",
7130                 .data           = &ipv6_devconf.ndisc_tclass,
7131                 .maxlen         = sizeof(int),
7132                 .mode           = 0644,
7133                 .proc_handler   = proc_dointvec_minmax,
7134                 .extra1         = (void *)SYSCTL_ZERO,
7135                 .extra2         = (void *)&two_five_five,
7136         },
7137         {
7138                 .procname       = "rpl_seg_enabled",
7139                 .data           = &ipv6_devconf.rpl_seg_enabled,
7140                 .maxlen         = sizeof(int),
7141                 .mode           = 0644,
7142                 .proc_handler   = proc_dointvec,
7143         },
7144         {
7145                 .procname       = "ioam6_enabled",
7146                 .data           = &ipv6_devconf.ioam6_enabled,
7147                 .maxlen         = sizeof(u8),
7148                 .mode           = 0644,
7149                 .proc_handler   = proc_dou8vec_minmax,
7150                 .extra1         = (void *)SYSCTL_ZERO,
7151                 .extra2         = (void *)SYSCTL_ONE,
7152         },
7153         {
7154                 .procname       = "ioam6_id",
7155                 .data           = &ipv6_devconf.ioam6_id,
7156                 .maxlen         = sizeof(u32),
7157                 .mode           = 0644,
7158                 .proc_handler   = proc_douintvec_minmax,
7159                 .extra1         = (void *)SYSCTL_ZERO,
7160                 .extra2         = (void *)&ioam6_if_id_max,
7161         },
7162         {
7163                 .procname       = "ioam6_id_wide",
7164                 .data           = &ipv6_devconf.ioam6_id_wide,
7165                 .maxlen         = sizeof(u32),
7166                 .mode           = 0644,
7167                 .proc_handler   = proc_douintvec,
7168         },
7169         {
7170                 .procname       = "ndisc_evict_nocarrier",
7171                 .data           = &ipv6_devconf.ndisc_evict_nocarrier,
7172                 .maxlen         = sizeof(u8),
7173                 .mode           = 0644,
7174                 .proc_handler   = proc_dou8vec_minmax,
7175                 .extra1         = (void *)SYSCTL_ZERO,
7176                 .extra2         = (void *)SYSCTL_ONE,
7177         },
7178         {
7179                 .procname       = "accept_untracked_na",
7180                 .data           = &ipv6_devconf.accept_untracked_na,
7181                 .maxlen         = sizeof(int),
7182                 .mode           = 0644,
7183                 .proc_handler   = proc_dointvec_minmax,
7184                 .extra1         = SYSCTL_ZERO,
7185                 .extra2         = SYSCTL_TWO,
7186         },
7187 };
7188
7189 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7190                 struct inet6_dev *idev, struct ipv6_devconf *p)
7191 {
7192         size_t table_size = ARRAY_SIZE(addrconf_sysctl);
7193         int i, ifindex;
7194         struct ctl_table *table;
7195         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7196
7197         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7198         if (!table)
7199                 goto out;
7200
7201         for (i = 0; i < table_size; i++) {
7202                 table[i].data += (char *)p - (char *)&ipv6_devconf;
7203                 /* If one of these is already set, then it is not safe to
7204                  * overwrite either of them: this makes proc_dointvec_minmax
7205                  * usable.
7206                  */
7207                 if (!table[i].extra1 && !table[i].extra2) {
7208                         table[i].extra1 = idev; /* embedded; no ref */
7209                         table[i].extra2 = net;
7210                 }
7211         }
7212
7213         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7214
7215         p->sysctl_header = register_net_sysctl_sz(net, path, table,
7216                                                   table_size);
7217         if (!p->sysctl_header)
7218                 goto free;
7219
7220         if (!strcmp(dev_name, "all"))
7221                 ifindex = NETCONFA_IFINDEX_ALL;
7222         else if (!strcmp(dev_name, "default"))
7223                 ifindex = NETCONFA_IFINDEX_DEFAULT;
7224         else
7225                 ifindex = idev->dev->ifindex;
7226         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7227                                      ifindex, p);
7228         return 0;
7229
7230 free:
7231         kfree(table);
7232 out:
7233         return -ENOBUFS;
7234 }
7235
7236 static void __addrconf_sysctl_unregister(struct net *net,
7237                                          struct ipv6_devconf *p, int ifindex)
7238 {
7239         const struct ctl_table *table;
7240
7241         if (!p->sysctl_header)
7242                 return;
7243
7244         table = p->sysctl_header->ctl_table_arg;
7245         unregister_net_sysctl_table(p->sysctl_header);
7246         p->sysctl_header = NULL;
7247         kfree(table);
7248
7249         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7250 }
7251
7252 static int addrconf_sysctl_register(struct inet6_dev *idev)
7253 {
7254         int err;
7255
7256         if (!sysctl_dev_name_is_allowed(idev->dev->name))
7257                 return -EINVAL;
7258
7259         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7260                                     &ndisc_ifinfo_sysctl_change);
7261         if (err)
7262                 return err;
7263         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7264                                          idev, &idev->cnf);
7265         if (err)
7266                 neigh_sysctl_unregister(idev->nd_parms);
7267
7268         return err;
7269 }
7270
7271 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7272 {
7273         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7274                                      idev->dev->ifindex);
7275         neigh_sysctl_unregister(idev->nd_parms);
7276 }
7277
7278
7279 #endif
7280
7281 static int __net_init addrconf_init_net(struct net *net)
7282 {
7283         int err = -ENOMEM;
7284         struct ipv6_devconf *all, *dflt;
7285
7286         spin_lock_init(&net->ipv6.addrconf_hash_lock);
7287         INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7288         net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7289                                            sizeof(struct hlist_head),
7290                                            GFP_KERNEL);
7291         if (!net->ipv6.inet6_addr_lst)
7292                 goto err_alloc_addr;
7293
7294         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7295         if (!all)
7296                 goto err_alloc_all;
7297
7298         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7299         if (!dflt)
7300                 goto err_alloc_dflt;
7301
7302         if (!net_eq(net, &init_net)) {
7303                 switch (net_inherit_devconf()) {
7304                 case 1:  /* copy from init_net */
7305                         memcpy(all, init_net.ipv6.devconf_all,
7306                                sizeof(ipv6_devconf));
7307                         memcpy(dflt, init_net.ipv6.devconf_dflt,
7308                                sizeof(ipv6_devconf_dflt));
7309                         break;
7310                 case 3: /* copy from the current netns */
7311                         memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7312                                sizeof(ipv6_devconf));
7313                         memcpy(dflt,
7314                                current->nsproxy->net_ns->ipv6.devconf_dflt,
7315                                sizeof(ipv6_devconf_dflt));
7316                         break;
7317                 case 0:
7318                 case 2:
7319                         /* use compiled values */
7320                         break;
7321                 }
7322         }
7323
7324         /* these will be inherited by all namespaces */
7325         dflt->autoconf = ipv6_defaults.autoconf;
7326         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7327
7328         dflt->stable_secret.initialized = false;
7329         all->stable_secret.initialized = false;
7330
7331         net->ipv6.devconf_all = all;
7332         net->ipv6.devconf_dflt = dflt;
7333
7334 #ifdef CONFIG_SYSCTL
7335         err = __addrconf_sysctl_register(net, "all", NULL, all);
7336         if (err < 0)
7337                 goto err_reg_all;
7338
7339         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7340         if (err < 0)
7341                 goto err_reg_dflt;
7342 #endif
7343         return 0;
7344
7345 #ifdef CONFIG_SYSCTL
7346 err_reg_dflt:
7347         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7348 err_reg_all:
7349         kfree(dflt);
7350         net->ipv6.devconf_dflt = NULL;
7351 #endif
7352 err_alloc_dflt:
7353         kfree(all);
7354         net->ipv6.devconf_all = NULL;
7355 err_alloc_all:
7356         kfree(net->ipv6.inet6_addr_lst);
7357 err_alloc_addr:
7358         return err;
7359 }
7360
7361 static void __net_exit addrconf_exit_net(struct net *net)
7362 {
7363         int i;
7364
7365 #ifdef CONFIG_SYSCTL
7366         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7367                                      NETCONFA_IFINDEX_DEFAULT);
7368         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7369                                      NETCONFA_IFINDEX_ALL);
7370 #endif
7371         kfree(net->ipv6.devconf_dflt);
7372         net->ipv6.devconf_dflt = NULL;
7373         kfree(net->ipv6.devconf_all);
7374         net->ipv6.devconf_all = NULL;
7375
7376         cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7377         /*
7378          *      Check hash table, then free it.
7379          */
7380         for (i = 0; i < IN6_ADDR_HSIZE; i++)
7381                 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7382
7383         kfree(net->ipv6.inet6_addr_lst);
7384         net->ipv6.inet6_addr_lst = NULL;
7385 }
7386
7387 static struct pernet_operations addrconf_ops = {
7388         .init = addrconf_init_net,
7389         .exit = addrconf_exit_net,
7390 };
7391
7392 static struct rtnl_af_ops inet6_ops __read_mostly = {
7393         .family           = AF_INET6,
7394         .fill_link_af     = inet6_fill_link_af,
7395         .get_link_af_size = inet6_get_link_af_size,
7396         .validate_link_af = inet6_validate_link_af,
7397         .set_link_af      = inet6_set_link_af,
7398 };
7399
7400 /*
7401  *      Init / cleanup code
7402  */
7403
7404 int __init addrconf_init(void)
7405 {
7406         struct inet6_dev *idev;
7407         int err;
7408
7409         err = ipv6_addr_label_init();
7410         if (err < 0) {
7411                 pr_crit("%s: cannot initialize default policy table: %d\n",
7412                         __func__, err);
7413                 goto out;
7414         }
7415
7416         err = register_pernet_subsys(&addrconf_ops);
7417         if (err < 0)
7418                 goto out_addrlabel;
7419
7420         /* All works using addrconf_wq need to lock rtnl. */
7421         addrconf_wq = create_singlethread_workqueue("ipv6_addrconf");
7422         if (!addrconf_wq) {
7423                 err = -ENOMEM;
7424                 goto out_nowq;
7425         }
7426
7427         rtnl_lock();
7428         idev = ipv6_add_dev(blackhole_netdev);
7429         rtnl_unlock();
7430         if (IS_ERR(idev)) {
7431                 err = PTR_ERR(idev);
7432                 goto errlo;
7433         }
7434
7435         ip6_route_init_special_entries();
7436
7437         register_netdevice_notifier(&ipv6_dev_notf);
7438
7439         addrconf_verify(&init_net);
7440
7441         rtnl_af_register(&inet6_ops);
7442
7443         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7444                                    NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED);
7445         if (err < 0)
7446                 goto errout;
7447
7448         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7449                                    inet6_rtm_newaddr, NULL, 0);
7450         if (err < 0)
7451                 goto errout;
7452         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7453                                    inet6_rtm_deladdr, NULL, 0);
7454         if (err < 0)
7455                 goto errout;
7456         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7457                                    inet6_rtm_getaddr, inet6_dump_ifaddr,
7458                                    RTNL_FLAG_DOIT_UNLOCKED |
7459                                    RTNL_FLAG_DUMP_UNLOCKED);
7460         if (err < 0)
7461                 goto errout;
7462         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7463                                    NULL, inet6_dump_ifmcaddr,
7464                                    RTNL_FLAG_DUMP_UNLOCKED);
7465         if (err < 0)
7466                 goto errout;
7467         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7468                                    NULL, inet6_dump_ifacaddr,
7469                                    RTNL_FLAG_DUMP_UNLOCKED);
7470         if (err < 0)
7471                 goto errout;
7472         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7473                                    inet6_netconf_get_devconf,
7474                                    inet6_netconf_dump_devconf,
7475                                    RTNL_FLAG_DOIT_UNLOCKED |
7476                                    RTNL_FLAG_DUMP_UNLOCKED);
7477         if (err < 0)
7478                 goto errout;
7479         err = ipv6_addr_label_rtnl_register();
7480         if (err < 0)
7481                 goto errout;
7482
7483         return 0;
7484 errout:
7485         rtnl_unregister_all(PF_INET6);
7486         rtnl_af_unregister(&inet6_ops);
7487         unregister_netdevice_notifier(&ipv6_dev_notf);
7488 errlo:
7489         destroy_workqueue(addrconf_wq);
7490 out_nowq:
7491         unregister_pernet_subsys(&addrconf_ops);
7492 out_addrlabel:
7493         ipv6_addr_label_cleanup();
7494 out:
7495         return err;
7496 }
7497
7498 void addrconf_cleanup(void)
7499 {
7500         struct net_device *dev;
7501
7502         unregister_netdevice_notifier(&ipv6_dev_notf);
7503         unregister_pernet_subsys(&addrconf_ops);
7504         ipv6_addr_label_cleanup();
7505
7506         rtnl_af_unregister(&inet6_ops);
7507
7508         rtnl_lock();
7509
7510         /* clean dev list */
7511         for_each_netdev(&init_net, dev) {
7512                 if (__in6_dev_get(dev) == NULL)
7513                         continue;
7514                 addrconf_ifdown(dev, true);
7515         }
7516         addrconf_ifdown(init_net.loopback_dev, true);
7517
7518         rtnl_unlock();
7519
7520         destroy_workqueue(addrconf_wq);
7521 }