net/ipv6/addrconf.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      IPv6 Address [auto]configuration
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   9  */
  10
  11 /*
  12  *      Changes:
  13  *
  14  *      Janos Farkas                    :       delete timer on ifdown
  15  *      <chexum@bankinf.banki.hu>
  16  *      Andi Kleen                      :       kill double kfree on module
  17  *                                              unload.
  18  *      Maciej W. Rozycki               :       FDDI support
  19  *      sekiya@USAGI                    :       Don't send too many RS
  20  *                                              packets.
  21  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  22  *                                              packets.
  23  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  24  *                                              address validation timer.
  25  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  26  *                                              support.
  27  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  28  *                                              address on a same interface.
  29  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  30  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  31  *                                              seq_file.
  32  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  33  *                                              selection; consider scope,
  34  *                                              status etc.
  35  */
  36
  37 #define pr_fmt(fmt) "IPv6: " fmt
  38
  39 #include <linux/errno.h>
  40 #include <linux/types.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched/signal.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/net.h>
  46 #include <linux/inet.h>
  47 #include <linux/in6.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_addr.h>
  50 #include <linux/if_arp.h>
  51 #include <linux/if_arcnet.h>
  52 #include <linux/if_infiniband.h>
  53 #include <linux/route.h>
  54 #include <linux/inetdevice.h>
  55 #include <linux/init.h>
  56 #include <linux/slab.h>
  57 #ifdef CONFIG_SYSCTL
  58 #include <linux/sysctl.h>
  59 #endif
  60 #include <linux/capability.h>
  61 #include <linux/delay.h>
  62 #include <linux/notifier.h>
  63 #include <linux/string.h>
  64 #include <linux/hash.h>
  65
  66 #include <net/net_namespace.h>
  67 #include <net/sock.h>
  68 #include <net/snmp.h>
  69
  70 #include <net/6lowpan.h>
  71 #include <net/firewire.h>
  72 #include <net/ipv6.h>
  73 #include <net/protocol.h>
  74 #include <net/ndisc.h>
  75 #include <net/ip6_route.h>
  76 #include <net/addrconf.h>
  77 #include <net/tcp.h>
  78 #include <net/ip.h>
  79 #include <net/netlink.h>
  80 #include <net/pkt_sched.h>
  81 #include <net/l3mdev.h>
  82 #include <linux/if_tunnel.h>
  83 #include <linux/rtnetlink.h>
  84 #include <linux/netconf.h>
  85 #include <linux/random.h>
  86 #include <linux/uaccess.h>
  87 #include <asm/unaligned.h>
  88
  89 #include <linux/proc_fs.h>
  90 #include <linux/seq_file.h>
  91 #include <linux/export.h>
  92 #include <linux/ioam6.h>
  93
  94 #define INFINITY_LIFE_TIME      0xFFFFFFFF
  95
  96 #define IPV6_MAX_STRLEN \
  97         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
  98
  99 static inline u32 cstamp_delta(unsigned long cstamp)
 100 {
 101         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 102 }
 103
 104 static inline s32 rfc3315_s14_backoff_init(s32 irt)
 105 {
 106         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
 107         u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
 108         do_div(tmp, 1000000);
 109         return (s32)tmp;
 110 }
 111
 112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
 113 {
 114         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
 115         u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
 116         do_div(tmp, 1000000);
 117         if ((s32)tmp > mrt) {
 118                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
 119                 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
 120                 do_div(tmp, 1000000);
 121         }
 122         return (s32)tmp;
 123 }
 124
 125 #ifdef CONFIG_SYSCTL
 126 static int addrconf_sysctl_register(struct inet6_dev *idev);
 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 128 #else
 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 130 {
 131         return 0;
 132 }
 133
 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 135 {
 136 }
 137 #endif
 138
 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
 140
 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 142 static int ipv6_count_addresses(const struct inet6_dev *idev);
 143 static int ipv6_generate_stable_address(struct in6_addr *addr,
 144                                         u8 dad_count,
 145                                         const struct inet6_dev *idev);
 146
 147 #define IN6_ADDR_HSIZE_SHIFT    8
 148 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
 149
 150 static void addrconf_verify(struct net *net);
 151 static void addrconf_verify_rtnl(struct net *net);
 152
 153 static struct workqueue_struct *addrconf_wq;
 154
 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 157
 158 static void addrconf_type_change(struct net_device *dev,
 159                                  unsigned long event);
 160 static int addrconf_ifdown(struct net_device *dev, bool unregister);
 161
 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 163                                                   int plen,
 164                                                   const struct net_device *dev,
 165                                                   u32 flags, u32 noflags,
 166                                                   bool no_gw);
 167
 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 169 static void addrconf_dad_work(struct work_struct *w);
 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
 171                                    bool send_na);
 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
 173 static void addrconf_rs_timer(struct timer_list *t);
 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 176
 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 178                                 struct prefix_info *pinfo);
 179
 180 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 181         .forwarding             = 0,
 182         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 183         .mtu6                   = IPV6_MIN_MTU,
 184         .accept_ra              = 1,
 185         .accept_redirects       = 1,
 186         .autoconf               = 1,
 187         .force_mld_version      = 0,
 188         .mldv1_unsolicited_report_interval = 10 * HZ,
 189         .mldv2_unsolicited_report_interval = HZ,
 190         .dad_transmits          = 1,
 191         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 192         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 193         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 194         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 195         .use_tempaddr           = 0,
 196         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 197         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 198         .regen_min_advance      = REGEN_MIN_ADVANCE,
 199         .regen_max_retry        = REGEN_MAX_RETRY,
 200         .max_desync_factor      = MAX_DESYNC_FACTOR,
 201         .max_addresses          = IPV6_MAX_ADDRESSES,
 202         .accept_ra_defrtr       = 1,
 203         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 204         .accept_ra_from_local   = 0,
 205         .accept_ra_min_hop_limit= 1,
 206         .accept_ra_min_lft      = 0,
 207         .accept_ra_pinfo        = 1,
 208 #ifdef CONFIG_IPV6_ROUTER_PREF
 209         .accept_ra_rtr_pref     = 1,
 210         .rtr_probe_interval     = 60 * HZ,
 211 #ifdef CONFIG_IPV6_ROUTE_INFO
 212         .accept_ra_rt_info_min_plen = 0,
 213         .accept_ra_rt_info_max_plen = 0,
 214 #endif
 215 #endif
 216         .proxy_ndp              = 0,
 217         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 218         .disable_ipv6           = 0,
 219         .accept_dad             = 0,
 220         .suppress_frag_ndisc    = 1,
 221         .accept_ra_mtu          = 1,
 222         .stable_secret          = {
 223                 .initialized = false,
 224         },
 225         .use_oif_addrs_only     = 0,
 226         .ignore_routes_with_linkdown = 0,
 227         .keep_addr_on_down      = 0,
 228         .seg6_enabled           = 0,
 229 #ifdef CONFIG_IPV6_SEG6_HMAC
 230         .seg6_require_hmac      = 0,
 231 #endif
 232         .enhanced_dad           = 1,
 233         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 234         .disable_policy         = 0,
 235         .rpl_seg_enabled        = 0,
 236         .ioam6_enabled          = 0,
 237         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 238         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 239         .ndisc_evict_nocarrier  = 1,
 240         .ra_honor_pio_life      = 0,
 241 };
 242
 243 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 244         .forwarding             = 0,
 245         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 246         .mtu6                   = IPV6_MIN_MTU,
 247         .accept_ra              = 1,
 248         .accept_redirects       = 1,
 249         .autoconf               = 1,
 250         .force_mld_version      = 0,
 251         .mldv1_unsolicited_report_interval = 10 * HZ,
 252         .mldv2_unsolicited_report_interval = HZ,
 253         .dad_transmits          = 1,
 254         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 255         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 256         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
 257         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 258         .use_tempaddr           = 0,
 259         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 260         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 261         .regen_min_advance      = REGEN_MIN_ADVANCE,
 262         .regen_max_retry        = REGEN_MAX_RETRY,
 263         .max_desync_factor      = MAX_DESYNC_FACTOR,
 264         .max_addresses          = IPV6_MAX_ADDRESSES,
 265         .accept_ra_defrtr       = 1,
 266         .ra_defrtr_metric       = IP6_RT_PRIO_USER,
 267         .accept_ra_from_local   = 0,
 268         .accept_ra_min_hop_limit= 1,
 269         .accept_ra_min_lft      = 0,
 270         .accept_ra_pinfo        = 1,
 271 #ifdef CONFIG_IPV6_ROUTER_PREF
 272         .accept_ra_rtr_pref     = 1,
 273         .rtr_probe_interval     = 60 * HZ,
 274 #ifdef CONFIG_IPV6_ROUTE_INFO
 275         .accept_ra_rt_info_min_plen = 0,
 276         .accept_ra_rt_info_max_plen = 0,
 277 #endif
 278 #endif
 279         .proxy_ndp              = 0,
 280         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 281         .disable_ipv6           = 0,
 282         .accept_dad             = 1,
 283         .suppress_frag_ndisc    = 1,
 284         .accept_ra_mtu          = 1,
 285         .stable_secret          = {
 286                 .initialized = false,
 287         },
 288         .use_oif_addrs_only     = 0,
 289         .ignore_routes_with_linkdown = 0,
 290         .keep_addr_on_down      = 0,
 291         .seg6_enabled           = 0,
 292 #ifdef CONFIG_IPV6_SEG6_HMAC
 293         .seg6_require_hmac      = 0,
 294 #endif
 295         .enhanced_dad           = 1,
 296         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
 297         .disable_policy         = 0,
 298         .rpl_seg_enabled        = 0,
 299         .ioam6_enabled          = 0,
 300         .ioam6_id               = IOAM6_DEFAULT_IF_ID,
 301         .ioam6_id_wide          = IOAM6_DEFAULT_IF_ID_WIDE,
 302         .ndisc_evict_nocarrier  = 1,
 303         .ra_honor_pio_life      = 0,
 304 };
 305
 306 /* Check if link is ready: is it up and is a valid qdisc available */
 307 static inline bool addrconf_link_ready(const struct net_device *dev)
 308 {
 309         return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
 310 }
 311
 312 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 313 {
 314         if (del_timer(&idev->rs_timer))
 315                 __in6_dev_put(idev);
 316 }
 317
 318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 319 {
 320         if (cancel_delayed_work(&ifp->dad_work))
 321                 __in6_ifa_put(ifp);
 322 }
 323
 324 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 325                                   unsigned long when)
 326 {
 327         if (!mod_timer(&idev->rs_timer, jiffies + when))
 328                 in6_dev_hold(idev);
 329 }
 330
 331 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 332                                    unsigned long delay)
 333 {
 334         in6_ifa_hold(ifp);
 335         if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
 336                 in6_ifa_put(ifp);
 337 }
 338
 339 static int snmp6_alloc_dev(struct inet6_dev *idev)
 340 {
 341         int i;
 342
 343         idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
 344         if (!idev->stats.ipv6)
 345                 goto err_ip;
 346
 347         for_each_possible_cpu(i) {
 348                 struct ipstats_mib *addrconf_stats;
 349                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 350                 u64_stats_init(&addrconf_stats->syncp);
 351         }
 352
 353
 354         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 355                                         GFP_KERNEL);
 356         if (!idev->stats.icmpv6dev)
 357                 goto err_icmp;
 358         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 359                                            GFP_KERNEL_ACCOUNT);
 360         if (!idev->stats.icmpv6msgdev)
 361                 goto err_icmpmsg;
 362
 363         return 0;
 364
 365 err_icmpmsg:
 366         kfree(idev->stats.icmpv6dev);
 367 err_icmp:
 368         free_percpu(idev->stats.ipv6);
 369 err_ip:
 370         return -ENOMEM;
 371 }
 372
 373 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 374 {
 375         struct inet6_dev *ndev;
 376         int err = -ENOMEM;
 377
 378         ASSERT_RTNL();
 379
 380         if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
 381                 return ERR_PTR(-EINVAL);
 382
 383         ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
 384         if (!ndev)
 385                 return ERR_PTR(err);
 386
 387         rwlock_init(&ndev->lock);
 388         ndev->dev = dev;
 389         INIT_LIST_HEAD(&ndev->addr_list);
 390         timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
 391         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 392
 393         if (ndev->cnf.stable_secret.initialized)
 394                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 395
 396         ndev->cnf.mtu6 = dev->mtu;
 397         ndev->ra_mtu = 0;
 398         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 399         if (!ndev->nd_parms) {
 400                 kfree(ndev);
 401                 return ERR_PTR(err);
 402         }
 403         if (ndev->cnf.forwarding)
 404                 dev_disable_lro(dev);
 405         /* We refer to the device */
 406         netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
 407
 408         if (snmp6_alloc_dev(ndev) < 0) {
 409                 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
 410                            __func__);
 411                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 412                 netdev_put(dev, &ndev->dev_tracker);
 413                 kfree(ndev);
 414                 return ERR_PTR(err);
 415         }
 416
 417         if (dev != blackhole_netdev) {
 418                 if (snmp6_register_dev(ndev) < 0) {
 419                         netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
 420                                    __func__, dev->name);
 421                         goto err_release;
 422                 }
 423         }
 424         /* One reference from device. */
 425         refcount_set(&ndev->refcnt, 1);
 426
 427         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 428                 ndev->cnf.accept_dad = -1;
 429
 430 #if IS_ENABLED(CONFIG_IPV6_SIT)
 431         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 432                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 433                 ndev->cnf.rtr_solicits = 0;
 434         }
 435 #endif
 436
 437         INIT_LIST_HEAD(&ndev->tempaddr_list);
 438         ndev->desync_factor = U32_MAX;
 439         if ((dev->flags&IFF_LOOPBACK) ||
 440             dev->type == ARPHRD_TUNNEL ||
 441             dev->type == ARPHRD_TUNNEL6 ||
 442             dev->type == ARPHRD_SIT ||
 443             dev->type == ARPHRD_NONE) {
 444                 ndev->cnf.use_tempaddr = -1;
 445         }
 446
 447         ndev->token = in6addr_any;
 448
 449         if (netif_running(dev) && addrconf_link_ready(dev))
 450                 ndev->if_flags |= IF_READY;
 451
 452         ipv6_mc_init_dev(ndev);
 453         ndev->tstamp = jiffies;
 454         if (dev != blackhole_netdev) {
 455                 err = addrconf_sysctl_register(ndev);
 456                 if (err) {
 457                         ipv6_mc_destroy_dev(ndev);
 458                         snmp6_unregister_dev(ndev);
 459                         goto err_release;
 460                 }
 461         }
 462         /* protected by rtnl_lock */
 463         rcu_assign_pointer(dev->ip6_ptr, ndev);
 464
 465         if (dev != blackhole_netdev) {
 466                 /* Join interface-local all-node multicast group */
 467                 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 468
 469                 /* Join all-node multicast group */
 470                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 471
 472                 /* Join all-router multicast group if forwarding is set */
 473                 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 474                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 475         }
 476         return ndev;
 477
 478 err_release:
 479         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 480         ndev->dead = 1;
 481         in6_dev_finish_destroy(ndev);
 482         return ERR_PTR(err);
 483 }
 484
 485 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 486 {
 487         struct inet6_dev *idev;
 488
 489         ASSERT_RTNL();
 490
 491         idev = __in6_dev_get(dev);
 492         if (!idev) {
 493                 idev = ipv6_add_dev(dev);
 494                 if (IS_ERR(idev))
 495                         return idev;
 496         }
 497
 498         if (dev->flags&IFF_UP)
 499                 ipv6_mc_up(idev);
 500         return idev;
 501 }
 502
 503 static int inet6_netconf_msgsize_devconf(int type)
 504 {
 505         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 506                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 507         bool all = false;
 508
 509         if (type == NETCONFA_ALL)
 510                 all = true;
 511
 512         if (all || type == NETCONFA_FORWARDING)
 513                 size += nla_total_size(4);
 514 #ifdef CONFIG_IPV6_MROUTE
 515         if (all || type == NETCONFA_MC_FORWARDING)
 516                 size += nla_total_size(4);
 517 #endif
 518         if (all || type == NETCONFA_PROXY_NEIGH)
 519                 size += nla_total_size(4);
 520
 521         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 522                 size += nla_total_size(4);
 523
 524         return size;
 525 }
 526
 527 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 528                                       struct ipv6_devconf *devconf, u32 portid,
 529                                       u32 seq, int event, unsigned int flags,
 530                                       int type)
 531 {
 532         struct nlmsghdr  *nlh;
 533         struct netconfmsg *ncm;
 534         bool all = false;
 535
 536         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 537                         flags);
 538         if (!nlh)
 539                 return -EMSGSIZE;
 540
 541         if (type == NETCONFA_ALL)
 542                 all = true;
 543
 544         ncm = nlmsg_data(nlh);
 545         ncm->ncm_family = AF_INET6;
 546
 547         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 548                 goto nla_put_failure;
 549
 550         if (!devconf)
 551                 goto out;
 552
 553         if ((all || type == NETCONFA_FORWARDING) &&
 554             nla_put_s32(skb, NETCONFA_FORWARDING,
 555                         READ_ONCE(devconf->forwarding)) < 0)
 556                 goto nla_put_failure;
 557 #ifdef CONFIG_IPV6_MROUTE
 558         if ((all || type == NETCONFA_MC_FORWARDING) &&
 559             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 560                         atomic_read(&devconf->mc_forwarding)) < 0)
 561                 goto nla_put_failure;
 562 #endif
 563         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 564             nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
 565                         READ_ONCE(devconf->proxy_ndp)) < 0)
 566                 goto nla_put_failure;
 567
 568         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 569             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 570                         READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0)
 571                 goto nla_put_failure;
 572
 573 out:
 574         nlmsg_end(skb, nlh);
 575         return 0;
 576
 577 nla_put_failure:
 578         nlmsg_cancel(skb, nlh);
 579         return -EMSGSIZE;
 580 }
 581
 582 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 583                                   int ifindex, struct ipv6_devconf *devconf)
 584 {
 585         struct sk_buff *skb;
 586         int err = -ENOBUFS;
 587
 588         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 589         if (!skb)
 590                 goto errout;
 591
 592         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 593                                          event, 0, type);
 594         if (err < 0) {
 595                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 596                 WARN_ON(err == -EMSGSIZE);
 597                 kfree_skb(skb);
 598                 goto errout;
 599         }
 600         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 601         return;
 602 errout:
 603         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 604 }
 605
 606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 607         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 608         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 609         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 610         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 611 };
 612
 613 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
 614                                        const struct nlmsghdr *nlh,
 615                                        struct nlattr **tb,
 616                                        struct netlink_ext_ack *extack)
 617 {
 618         int i, err;
 619
 620         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
 621                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
 622                 return -EINVAL;
 623         }
 624
 625         if (!netlink_strict_get_check(skb))
 626                 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
 627                                               tb, NETCONFA_MAX,
 628                                               devconf_ipv6_policy, extack);
 629
 630         err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
 631                                             tb, NETCONFA_MAX,
 632                                             devconf_ipv6_policy, extack);
 633         if (err)
 634                 return err;
 635
 636         for (i = 0; i <= NETCONFA_MAX; i++) {
 637                 if (!tb[i])
 638                         continue;
 639
 640                 switch (i) {
 641                 case NETCONFA_IFINDEX:
 642                         break;
 643                 default:
 644                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
 645                         return -EINVAL;
 646                 }
 647         }
 648
 649         return 0;
 650 }
 651
 652 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 653                                      struct nlmsghdr *nlh,
 654                                      struct netlink_ext_ack *extack)
 655 {
 656         struct net *net = sock_net(in_skb->sk);
 657         struct nlattr *tb[NETCONFA_MAX+1];
 658         struct inet6_dev *in6_dev = NULL;
 659         struct net_device *dev = NULL;
 660         struct sk_buff *skb;
 661         struct ipv6_devconf *devconf;
 662         int ifindex;
 663         int err;
 664
 665         err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
 666         if (err < 0)
 667                 return err;
 668
 669         if (!tb[NETCONFA_IFINDEX])
 670                 return -EINVAL;
 671
 672         err = -EINVAL;
 673         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 674         switch (ifindex) {
 675         case NETCONFA_IFINDEX_ALL:
 676                 devconf = net->ipv6.devconf_all;
 677                 break;
 678         case NETCONFA_IFINDEX_DEFAULT:
 679                 devconf = net->ipv6.devconf_dflt;
 680                 break;
 681         default:
 682                 dev = dev_get_by_index(net, ifindex);
 683                 if (!dev)
 684                         return -EINVAL;
 685                 in6_dev = in6_dev_get(dev);
 686                 if (!in6_dev)
 687                         goto errout;
 688                 devconf = &in6_dev->cnf;
 689                 break;
 690         }
 691
 692         err = -ENOBUFS;
 693         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
 694         if (!skb)
 695                 goto errout;
 696
 697         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 698                                          NETLINK_CB(in_skb).portid,
 699                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 700                                          NETCONFA_ALL);
 701         if (err < 0) {
 702                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 703                 WARN_ON(err == -EMSGSIZE);
 704                 kfree_skb(skb);
 705                 goto errout;
 706         }
 707         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 708 errout:
 709         if (in6_dev)
 710                 in6_dev_put(in6_dev);
 711         dev_put(dev);
 712         return err;
 713 }
 714
 715 /* Combine dev_addr_genid and dev_base_seq to detect changes.
 716  */
 717 static u32 inet6_base_seq(const struct net *net)
 718 {
 719         u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
 720                   READ_ONCE(net->dev_base_seq);
 721
 722         /* Must not return 0 (see nl_dump_check_consistent()).
 723          * Chose a value far away from 0.
 724          */
 725         if (!res)
 726                 res = 0x80000000;
 727         return res;
 728 }
 729
 730 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 731                                       struct netlink_callback *cb)
 732 {
 733         const struct nlmsghdr *nlh = cb->nlh;
 734         struct net *net = sock_net(skb->sk);
 735         struct {
 736                 unsigned long ifindex;
 737                 unsigned int all_default;
 738         } *ctx = (void *)cb->ctx;
 739         struct net_device *dev;
 740         struct inet6_dev *idev;
 741         int err = 0;
 742
 743         if (cb->strict_check) {
 744                 struct netlink_ext_ack *extack = cb->extack;
 745                 struct netconfmsg *ncm;
 746
 747                 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
 748                         NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
 749                         return -EINVAL;
 750                 }
 751
 752                 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
 753                         NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
 754                         return -EINVAL;
 755                 }
 756         }
 757
 758         rcu_read_lock();
 759         for_each_netdev_dump(net, dev, ctx->ifindex) {
 760                 idev = __in6_dev_get(dev);
 761                 if (!idev)
 762                         continue;
 763                 err = inet6_netconf_fill_devconf(skb, dev->ifindex,
 764                                                  &idev->cnf,
 765                                                  NETLINK_CB(cb->skb).portid,
 766                                                  nlh->nlmsg_seq,
 767                                                  RTM_NEWNETCONF,
 768                                                  NLM_F_MULTI,
 769                                                  NETCONFA_ALL);
 770                 if (err < 0)
 771                         goto done;
 772         }
 773         if (ctx->all_default == 0) {
 774                 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 775                                                  net->ipv6.devconf_all,
 776                                                  NETLINK_CB(cb->skb).portid,
 777                                                  nlh->nlmsg_seq,
 778                                                  RTM_NEWNETCONF, NLM_F_MULTI,
 779                                                  NETCONFA_ALL);
 780                 if (err < 0)
 781                         goto done;
 782                 ctx->all_default++;
 783         }
 784         if (ctx->all_default == 1) {
 785                 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 786                                                  net->ipv6.devconf_dflt,
 787                                                  NETLINK_CB(cb->skb).portid,
 788                                                  nlh->nlmsg_seq,
 789                                                  RTM_NEWNETCONF, NLM_F_MULTI,
 790                                                  NETCONFA_ALL);
 791                 if (err < 0)
 792                         goto done;
 793                 ctx->all_default++;
 794         }
 795 done:
 796         rcu_read_unlock();
 797         return err;
 798 }
 799
 800 #ifdef CONFIG_SYSCTL
 801 static void dev_forward_change(struct inet6_dev *idev)
 802 {
 803         struct net_device *dev;
 804         struct inet6_ifaddr *ifa;
 805         LIST_HEAD(tmp_addr_list);
 806
 807         if (!idev)
 808                 return;
 809         dev = idev->dev;
 810         if (idev->cnf.forwarding)
 811                 dev_disable_lro(dev);
 812         if (dev->flags & IFF_MULTICAST) {
 813                 if (idev->cnf.forwarding) {
 814                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 815                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 816                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 817                 } else {
 818                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 819                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 820                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 821                 }
 822         }
 823
 824         read_lock_bh(&idev->lock);
 825         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 826                 if (ifa->flags&IFA_F_TENTATIVE)
 827                         continue;
 828                 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
 829         }
 830         read_unlock_bh(&idev->lock);
 831
 832         while (!list_empty(&tmp_addr_list)) {
 833                 ifa = list_first_entry(&tmp_addr_list,
 834                                        struct inet6_ifaddr, if_list_aux);
 835                 list_del(&ifa->if_list_aux);
 836                 if (idev->cnf.forwarding)
 837                         addrconf_join_anycast(ifa);
 838                 else
 839                         addrconf_leave_anycast(ifa);
 840         }
 841
 842         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
 843                                      NETCONFA_FORWARDING,
 844                                      dev->ifindex, &idev->cnf);
 845 }
 846
 847
 848 static void addrconf_forward_change(struct net *net, __s32 newf)
 849 {
 850         struct net_device *dev;
 851         struct inet6_dev *idev;
 852
 853         for_each_netdev(net, dev) {
 854                 idev = __in6_dev_get(dev);
 855                 if (idev) {
 856                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 857
 858                         WRITE_ONCE(idev->cnf.forwarding, newf);
 859                         if (changed)
 860                                 dev_forward_change(idev);
 861                 }
 862         }
 863 }
 864
 865 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 866 {
 867         struct net *net;
 868         int old;
 869
 870         if (!rtnl_trylock())
 871                 return restart_syscall();
 872
 873         net = (struct net *)table->extra2;
 874         old = *p;
 875         WRITE_ONCE(*p, newf);
 876
 877         if (p == &net->ipv6.devconf_dflt->forwarding) {
 878                 if ((!newf) ^ (!old))
 879                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 880                                                      NETCONFA_FORWARDING,
 881                                                      NETCONFA_IFINDEX_DEFAULT,
 882                                                      net->ipv6.devconf_dflt);
 883                 rtnl_unlock();
 884                 return 0;
 885         }
 886
 887         if (p == &net->ipv6.devconf_all->forwarding) {
 888                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 889
 890                 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf);
 891                 if ((!newf) ^ (!old_dflt))
 892                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 893                                                      NETCONFA_FORWARDING,
 894                                                      NETCONFA_IFINDEX_DEFAULT,
 895                                                      net->ipv6.devconf_dflt);
 896
 897                 addrconf_forward_change(net, newf);
 898                 if ((!newf) ^ (!old))
 899                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
 900                                                      NETCONFA_FORWARDING,
 901                                                      NETCONFA_IFINDEX_ALL,
 902                                                      net->ipv6.devconf_all);
 903         } else if ((!newf) ^ (!old))
 904                 dev_forward_change((struct inet6_dev *)table->extra1);
 905         rtnl_unlock();
 906
 907         if (newf)
 908                 rt6_purge_dflt_routers(net);
 909         return 1;
 910 }
 911
 912 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 913 {
 914         struct net_device *dev;
 915         struct inet6_dev *idev;
 916
 917         for_each_netdev(net, dev) {
 918                 idev = __in6_dev_get(dev);
 919                 if (idev) {
 920                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 921
 922                         WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf);
 923                         if (changed)
 924                                 inet6_netconf_notify_devconf(dev_net(dev),
 925                                                              RTM_NEWNETCONF,
 926                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 927                                                              dev->ifindex,
 928                                                              &idev->cnf);
 929                 }
 930         }
 931 }
 932
 933 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 934 {
 935         struct net *net;
 936         int old;
 937
 938         if (!rtnl_trylock())
 939                 return restart_syscall();
 940
 941         net = (struct net *)table->extra2;
 942         old = *p;
 943         WRITE_ONCE(*p, newf);
 944
 945         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 946                 if ((!newf) ^ (!old))
 947                         inet6_netconf_notify_devconf(net,
 948                                                      RTM_NEWNETCONF,
 949                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 950                                                      NETCONFA_IFINDEX_DEFAULT,
 951                                                      net->ipv6.devconf_dflt);
 952                 rtnl_unlock();
 953                 return 0;
 954         }
 955
 956         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 957                 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf);
 958                 addrconf_linkdown_change(net, newf);
 959                 if ((!newf) ^ (!old))
 960                         inet6_netconf_notify_devconf(net,
 961                                                      RTM_NEWNETCONF,
 962                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 963                                                      NETCONFA_IFINDEX_ALL,
 964                                                      net->ipv6.devconf_all);
 965         }
 966         rtnl_unlock();
 967
 968         return 1;
 969 }
 970
 971 #endif
 972
 973 /* Nobody refers to this ifaddr, destroy it */
 974 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 975 {
 976         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 977
 978 #ifdef NET_REFCNT_DEBUG
 979         pr_debug("%s\n", __func__);
 980 #endif
 981
 982         in6_dev_put(ifp->idev);
 983
 984         if (cancel_delayed_work(&ifp->dad_work))
 985                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 986                           ifp);
 987
 988         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 989                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 990                 return;
 991         }
 992
 993         kfree_rcu(ifp, rcu);
 994 }
 995
 996 static void
 997 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 998 {
 999         struct list_head *p;
1000         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1001
1002         /*
1003          * Each device address list is sorted in order of scope -
1004          * global before linklocal.
1005          */
1006         list_for_each(p, &idev->addr_list) {
1007                 struct inet6_ifaddr *ifa
1008                         = list_entry(p, struct inet6_ifaddr, if_list);
1009                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1010                         break;
1011         }
1012
1013         list_add_tail_rcu(&ifp->if_list, p);
1014 }
1015
1016 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1017 {
1018         u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1019
1020         return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1021 }
1022
1023 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1024                                struct net_device *dev, unsigned int hash)
1025 {
1026         struct inet6_ifaddr *ifp;
1027
1028         hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1029                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1030                         if (!dev || ifp->idev->dev == dev)
1031                                 return true;
1032                 }
1033         }
1034         return false;
1035 }
1036
1037 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1038 {
1039         struct net *net = dev_net(dev);
1040         unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1041         int err = 0;
1042
1043         spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1044
1045         /* Ignore adding duplicate addresses on an interface */
1046         if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1047                 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1048                 err = -EEXIST;
1049         } else {
1050                 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1051         }
1052
1053         spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1054
1055         return err;
1056 }
1057
1058 /* On success it returns ifp with increased reference count */
1059
1060 static struct inet6_ifaddr *
1061 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1062               bool can_block, struct netlink_ext_ack *extack)
1063 {
1064         gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1065         int addr_type = ipv6_addr_type(cfg->pfx);
1066         struct net *net = dev_net(idev->dev);
1067         struct inet6_ifaddr *ifa = NULL;
1068         struct fib6_info *f6i = NULL;
1069         int err = 0;
1070
1071         if (addr_type == IPV6_ADDR_ANY) {
1072                 NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1073                 return ERR_PTR(-EADDRNOTAVAIL);
1074         } else if (addr_type & IPV6_ADDR_MULTICAST &&
1075                    !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1076                 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1077                 return ERR_PTR(-EADDRNOTAVAIL);
1078         } else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1079                    !netif_is_l3_master(idev->dev) &&
1080                    addr_type & IPV6_ADDR_LOOPBACK) {
1081                 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1082                 return ERR_PTR(-EADDRNOTAVAIL);
1083         }
1084
1085         if (idev->dead) {
1086                 NL_SET_ERR_MSG_MOD(extack, "device is going away");
1087                 err = -ENODEV;
1088                 goto out;
1089         }
1090
1091         if (idev->cnf.disable_ipv6) {
1092                 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1093                 err = -EACCES;
1094                 goto out;
1095         }
1096
1097         /* validator notifier needs to be blocking;
1098          * do not call in atomic context
1099          */
1100         if (can_block) {
1101                 struct in6_validator_info i6vi = {
1102                         .i6vi_addr = *cfg->pfx,
1103                         .i6vi_dev = idev,
1104                         .extack = extack,
1105                 };
1106
1107                 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1108                 err = notifier_to_errno(err);
1109                 if (err < 0)
1110                         goto out;
1111         }
1112
1113         ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1114         if (!ifa) {
1115                 err = -ENOBUFS;
1116                 goto out;
1117         }
1118
1119         f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
1120         if (IS_ERR(f6i)) {
1121                 err = PTR_ERR(f6i);
1122                 f6i = NULL;
1123                 goto out;
1124         }
1125
1126         neigh_parms_data_state_setall(idev->nd_parms);
1127
1128         ifa->addr = *cfg->pfx;
1129         if (cfg->peer_pfx)
1130                 ifa->peer_addr = *cfg->peer_pfx;
1131
1132         spin_lock_init(&ifa->lock);
1133         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1134         INIT_HLIST_NODE(&ifa->addr_lst);
1135         ifa->scope = cfg->scope;
1136         ifa->prefix_len = cfg->plen;
1137         ifa->rt_priority = cfg->rt_priority;
1138         ifa->flags = cfg->ifa_flags;
1139         ifa->ifa_proto = cfg->ifa_proto;
1140         /* No need to add the TENTATIVE flag for addresses with NODAD */
1141         if (!(cfg->ifa_flags & IFA_F_NODAD))
1142                 ifa->flags |= IFA_F_TENTATIVE;
1143         ifa->valid_lft = cfg->valid_lft;
1144         ifa->prefered_lft = cfg->preferred_lft;
1145         ifa->cstamp = ifa->tstamp = jiffies;
1146         ifa->tokenized = false;
1147
1148         ifa->rt = f6i;
1149
1150         ifa->idev = idev;
1151         in6_dev_hold(idev);
1152
1153         /* For caller */
1154         refcount_set(&ifa->refcnt, 1);
1155
1156         rcu_read_lock();
1157
1158         err = ipv6_add_addr_hash(idev->dev, ifa);
1159         if (err < 0) {
1160                 rcu_read_unlock();
1161                 goto out;
1162         }
1163
1164         write_lock_bh(&idev->lock);
1165
1166         /* Add to inet6_dev unicast addr list. */
1167         ipv6_link_dev_addr(idev, ifa);
1168
1169         if (ifa->flags&IFA_F_TEMPORARY) {
1170                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1171                 in6_ifa_hold(ifa);
1172         }
1173
1174         in6_ifa_hold(ifa);
1175         write_unlock_bh(&idev->lock);
1176
1177         rcu_read_unlock();
1178
1179         inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1180 out:
1181         if (unlikely(err < 0)) {
1182                 fib6_info_release(f6i);
1183
1184                 if (ifa) {
1185                         if (ifa->idev)
1186                                 in6_dev_put(ifa->idev);
1187                         kfree(ifa);
1188                 }
1189                 ifa = ERR_PTR(err);
1190         }
1191
1192         return ifa;
1193 }
1194
1195 enum cleanup_prefix_rt_t {
1196         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1197         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1198         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1199 };
1200
1201 /*
1202  * Check, whether the prefix for ifp would still need a prefix route
1203  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1204  * constants.
1205  *
1206  * 1) we don't purge prefix if address was not permanent.
1207  *    prefix is managed by its own lifetime.
1208  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1209  * 3) if there are no addresses, delete prefix.
1210  * 4) if there are still other permanent address(es),
1211  *    corresponding prefix is still permanent.
1212  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1213  *    don't purge the prefix, assume user space is managing it.
1214  * 6) otherwise, update prefix lifetime to the
1215  *    longest valid lifetime among the corresponding
1216  *    addresses on the device.
1217  *    Note: subsequent RA will update lifetime.
1218  **/
1219 static enum cleanup_prefix_rt_t
1220 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1221 {
1222         struct inet6_ifaddr *ifa;
1223         struct inet6_dev *idev = ifp->idev;
1224         unsigned long lifetime;
1225         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1226
1227         *expires = jiffies;
1228
1229         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1230                 if (ifa == ifp)
1231                         continue;
1232                 if (ifa->prefix_len != ifp->prefix_len ||
1233                     !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1234                                        ifp->prefix_len))
1235                         continue;
1236                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1237                         return CLEANUP_PREFIX_RT_NOP;
1238
1239                 action = CLEANUP_PREFIX_RT_EXPIRE;
1240
1241                 spin_lock(&ifa->lock);
1242
1243                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1244                 /*
1245                  * Note: Because this address is
1246                  * not permanent, lifetime <
1247                  * LONG_MAX / HZ here.
1248                  */
1249                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1250                         *expires = ifa->tstamp + lifetime * HZ;
1251                 spin_unlock(&ifa->lock);
1252         }
1253
1254         return action;
1255 }
1256
1257 static void
1258 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1259                      bool del_rt, bool del_peer)
1260 {
1261         struct fib6_table *table;
1262         struct fib6_info *f6i;
1263
1264         f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1265                                         ifp->prefix_len,
1266                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
1267         if (f6i) {
1268                 if (del_rt)
1269                         ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1270                 else {
1271                         if (!(f6i->fib6_flags & RTF_EXPIRES)) {
1272                                 table = f6i->fib6_table;
1273                                 spin_lock_bh(&table->tb6_lock);
1274
1275                                 fib6_set_expires(f6i, expires);
1276                                 fib6_add_gc_list(f6i);
1277
1278                                 spin_unlock_bh(&table->tb6_lock);
1279                         }
1280                         fib6_info_release(f6i);
1281                 }
1282         }
1283 }
1284
1285
1286 /* This function wants to get referenced ifp and releases it before return */
1287
1288 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1289 {
1290         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1291         struct net *net = dev_net(ifp->idev->dev);
1292         unsigned long expires;
1293         int state;
1294
1295         ASSERT_RTNL();
1296
1297         spin_lock_bh(&ifp->lock);
1298         state = ifp->state;
1299         ifp->state = INET6_IFADDR_STATE_DEAD;
1300         spin_unlock_bh(&ifp->lock);
1301
1302         if (state == INET6_IFADDR_STATE_DEAD)
1303                 goto out;
1304
1305         spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1306         hlist_del_init_rcu(&ifp->addr_lst);
1307         spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1308
1309         write_lock_bh(&ifp->idev->lock);
1310
1311         if (ifp->flags&IFA_F_TEMPORARY) {
1312                 list_del(&ifp->tmp_list);
1313                 if (ifp->ifpub) {
1314                         in6_ifa_put(ifp->ifpub);
1315                         ifp->ifpub = NULL;
1316                 }
1317                 __in6_ifa_put(ifp);
1318         }
1319
1320         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1321                 action = check_cleanup_prefix_route(ifp, &expires);
1322
1323         list_del_rcu(&ifp->if_list);
1324         __in6_ifa_put(ifp);
1325
1326         write_unlock_bh(&ifp->idev->lock);
1327
1328         addrconf_del_dad_work(ifp);
1329
1330         ipv6_ifa_notify(RTM_DELADDR, ifp);
1331
1332         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1333
1334         if (action != CLEANUP_PREFIX_RT_NOP) {
1335                 cleanup_prefix_route(ifp, expires,
1336                         action == CLEANUP_PREFIX_RT_DEL, false);
1337         }
1338
1339         /* clean up prefsrc entries */
1340         rt6_remove_prefsrc(ifp);
1341 out:
1342         in6_ifa_put(ifp);
1343 }
1344
1345 static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev)
1346 {
1347         return READ_ONCE(idev->cnf.regen_min_advance) +
1348                 READ_ONCE(idev->cnf.regen_max_retry) *
1349                 READ_ONCE(idev->cnf.dad_transmits) *
1350                 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1351 }
1352
1353 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1354 {
1355         struct inet6_dev *idev = ifp->idev;
1356         unsigned long tmp_tstamp, age;
1357         unsigned long regen_advance;
1358         unsigned long now = jiffies;
1359         u32 if_public_preferred_lft;
1360         s32 cnf_temp_preferred_lft;
1361         struct inet6_ifaddr *ift;
1362         struct ifa6_config cfg;
1363         long max_desync_factor;
1364         struct in6_addr addr;
1365         int ret = 0;
1366
1367         write_lock_bh(&idev->lock);
1368
1369 retry:
1370         in6_dev_hold(idev);
1371         if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) {
1372                 write_unlock_bh(&idev->lock);
1373                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1374                 in6_dev_put(idev);
1375                 ret = -1;
1376                 goto out;
1377         }
1378         spin_lock_bh(&ifp->lock);
1379         if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) {
1380                 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/
1381                 spin_unlock_bh(&ifp->lock);
1382                 write_unlock_bh(&idev->lock);
1383                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1384                         __func__);
1385                 in6_dev_put(idev);
1386                 ret = -1;
1387                 goto out;
1388         }
1389         in6_ifa_hold(ifp);
1390         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1391         ipv6_gen_rnd_iid(&addr);
1392
1393         age = (now - ifp->tstamp) / HZ;
1394
1395         regen_advance = ipv6_get_regen_advance(idev);
1396
1397         /* recalculate max_desync_factor each time and update
1398          * idev->desync_factor if it's larger
1399          */
1400         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1401         max_desync_factor = min_t(long,
1402                                   READ_ONCE(idev->cnf.max_desync_factor),
1403                                   cnf_temp_preferred_lft - regen_advance);
1404
1405         if (unlikely(idev->desync_factor > max_desync_factor)) {
1406                 if (max_desync_factor > 0) {
1407                         get_random_bytes(&idev->desync_factor,
1408                                          sizeof(idev->desync_factor));
1409                         idev->desync_factor %= max_desync_factor;
1410                 } else {
1411                         idev->desync_factor = 0;
1412                 }
1413         }
1414
1415         if_public_preferred_lft = ifp->prefered_lft;
1416
1417         memset(&cfg, 0, sizeof(cfg));
1418         cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1419                               READ_ONCE(idev->cnf.temp_valid_lft) + age);
1420         cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1421         cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft);
1422         cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft);
1423
1424         cfg.plen = ifp->prefix_len;
1425         tmp_tstamp = ifp->tstamp;
1426         spin_unlock_bh(&ifp->lock);
1427
1428         write_unlock_bh(&idev->lock);
1429
1430         /* From RFC 4941:
1431          *
1432          *     A temporary address is created only if this calculated Preferred
1433          *     Lifetime is greater than REGEN_ADVANCE time units.  In
1434          *     particular, an implementation must not create a temporary address
1435          *     with a zero Preferred Lifetime.
1436          *
1437          *     ...
1438          *
1439          *     When creating a temporary address, the lifetime values MUST be
1440          *     derived from the corresponding prefix as follows:
1441          *
1442          *     ...
1443          *
1444          *     *  Its Preferred Lifetime is the lower of the Preferred Lifetime
1445          *        of the public address or TEMP_PREFERRED_LIFETIME -
1446          *        DESYNC_FACTOR.
1447          *
1448          * To comply with the RFC's requirements, clamp the preferred lifetime
1449          * to a minimum of regen_advance, unless that would exceed valid_lft or
1450          * ifp->prefered_lft.
1451          *
1452          * Use age calculation as in addrconf_verify to avoid unnecessary
1453          * temporary addresses being generated.
1454          */
1455         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1456         if (cfg.preferred_lft <= regen_advance + age) {
1457                 cfg.preferred_lft = regen_advance + age + 1;
1458                 if (cfg.preferred_lft > cfg.valid_lft ||
1459                     cfg.preferred_lft > if_public_preferred_lft) {
1460                         in6_ifa_put(ifp);
1461                         in6_dev_put(idev);
1462                         ret = -1;
1463                         goto out;
1464                 }
1465         }
1466
1467         cfg.ifa_flags = IFA_F_TEMPORARY;
1468         /* set in addrconf_prefix_rcv() */
1469         if (ifp->flags & IFA_F_OPTIMISTIC)
1470                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1471
1472         cfg.pfx = &addr;
1473         cfg.scope = ipv6_addr_scope(cfg.pfx);
1474
1475         ift = ipv6_add_addr(idev, &cfg, block, NULL);
1476         if (IS_ERR(ift)) {
1477                 in6_ifa_put(ifp);
1478                 in6_dev_put(idev);
1479                 pr_info("%s: retry temporary address regeneration\n", __func__);
1480                 write_lock_bh(&idev->lock);
1481                 goto retry;
1482         }
1483
1484         spin_lock_bh(&ift->lock);
1485         ift->ifpub = ifp;
1486         ift->cstamp = now;
1487         ift->tstamp = tmp_tstamp;
1488         spin_unlock_bh(&ift->lock);
1489
1490         addrconf_dad_start(ift);
1491         in6_ifa_put(ift);
1492         in6_dev_put(idev);
1493 out:
1494         return ret;
1495 }
1496
1497 /*
1498  *      Choose an appropriate source address (RFC3484)
1499  */
1500 enum {
1501         IPV6_SADDR_RULE_INIT = 0,
1502         IPV6_SADDR_RULE_LOCAL,
1503         IPV6_SADDR_RULE_SCOPE,
1504         IPV6_SADDR_RULE_PREFERRED,
1505 #ifdef CONFIG_IPV6_MIP6
1506         IPV6_SADDR_RULE_HOA,
1507 #endif
1508         IPV6_SADDR_RULE_OIF,
1509         IPV6_SADDR_RULE_LABEL,
1510         IPV6_SADDR_RULE_PRIVACY,
1511         IPV6_SADDR_RULE_ORCHID,
1512         IPV6_SADDR_RULE_PREFIX,
1513 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1514         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1515 #endif
1516         IPV6_SADDR_RULE_MAX
1517 };
1518
1519 struct ipv6_saddr_score {
1520         int                     rule;
1521         int                     addr_type;
1522         struct inet6_ifaddr     *ifa;
1523         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1524         int                     scopedist;
1525         int                     matchlen;
1526 };
1527
1528 struct ipv6_saddr_dst {
1529         const struct in6_addr *addr;
1530         int ifindex;
1531         int scope;
1532         int label;
1533         unsigned int prefs;
1534 };
1535
1536 static inline int ipv6_saddr_preferred(int type)
1537 {
1538         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1539                 return 1;
1540         return 0;
1541 }
1542
1543 static bool ipv6_use_optimistic_addr(const struct net *net,
1544                                      const struct inet6_dev *idev)
1545 {
1546 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1547         if (!idev)
1548                 return false;
1549         if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1550             !READ_ONCE(idev->cnf.optimistic_dad))
1551                 return false;
1552         if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) &&
1553             !READ_ONCE(idev->cnf.use_optimistic))
1554                 return false;
1555
1556         return true;
1557 #else
1558         return false;
1559 #endif
1560 }
1561
1562 static bool ipv6_allow_optimistic_dad(const struct net *net,
1563                                       const struct inet6_dev *idev)
1564 {
1565 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1566         if (!idev)
1567                 return false;
1568         if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1569             !READ_ONCE(idev->cnf.optimistic_dad))
1570                 return false;
1571
1572         return true;
1573 #else
1574         return false;
1575 #endif
1576 }
1577
1578 static int ipv6_get_saddr_eval(struct net *net,
1579                                struct ipv6_saddr_score *score,
1580                                struct ipv6_saddr_dst *dst,
1581                                int i)
1582 {
1583         int ret;
1584
1585         if (i <= score->rule) {
1586                 switch (i) {
1587                 case IPV6_SADDR_RULE_SCOPE:
1588                         ret = score->scopedist;
1589                         break;
1590                 case IPV6_SADDR_RULE_PREFIX:
1591                         ret = score->matchlen;
1592                         break;
1593                 default:
1594                         ret = !!test_bit(i, score->scorebits);
1595                 }
1596                 goto out;
1597         }
1598
1599         switch (i) {
1600         case IPV6_SADDR_RULE_INIT:
1601                 /* Rule 0: remember if hiscore is not ready yet */
1602                 ret = !!score->ifa;
1603                 break;
1604         case IPV6_SADDR_RULE_LOCAL:
1605                 /* Rule 1: Prefer same address */
1606                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1607                 break;
1608         case IPV6_SADDR_RULE_SCOPE:
1609                 /* Rule 2: Prefer appropriate scope
1610                  *
1611                  *      ret
1612                  *       ^
1613                  *    -1 |  d 15
1614                  *    ---+--+-+---> scope
1615                  *       |
1616                  *       |             d is scope of the destination.
1617                  *  B-d  |  \
1618                  *       |   \      <- smaller scope is better if
1619                  *  B-15 |    \        if scope is enough for destination.
1620                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1621                  * d-C-1 | /
1622                  *       |/         <- greater is better
1623                  *   -C  /             if scope is not enough for destination.
1624                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1625                  *
1626                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1627                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1628                  * Assume B = 0 and we get C > 29.
1629                  */
1630                 ret = __ipv6_addr_src_scope(score->addr_type);
1631                 if (ret >= dst->scope)
1632                         ret = -ret;
1633                 else
1634                         ret -= 128;     /* 30 is enough */
1635                 score->scopedist = ret;
1636                 break;
1637         case IPV6_SADDR_RULE_PREFERRED:
1638             {
1639                 /* Rule 3: Avoid deprecated and optimistic addresses */
1640                 u8 avoid = IFA_F_DEPRECATED;
1641
1642                 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1643                         avoid |= IFA_F_OPTIMISTIC;
1644                 ret = ipv6_saddr_preferred(score->addr_type) ||
1645                       !(score->ifa->flags & avoid);
1646                 break;
1647             }
1648 #ifdef CONFIG_IPV6_MIP6
1649         case IPV6_SADDR_RULE_HOA:
1650             {
1651                 /* Rule 4: Prefer home address */
1652                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1653                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1654                 break;
1655             }
1656 #endif
1657         case IPV6_SADDR_RULE_OIF:
1658                 /* Rule 5: Prefer outgoing interface */
1659                 ret = (!dst->ifindex ||
1660                        dst->ifindex == score->ifa->idev->dev->ifindex);
1661                 break;
1662         case IPV6_SADDR_RULE_LABEL:
1663                 /* Rule 6: Prefer matching label */
1664                 ret = ipv6_addr_label(net,
1665                                       &score->ifa->addr, score->addr_type,
1666                                       score->ifa->idev->dev->ifindex) == dst->label;
1667                 break;
1668         case IPV6_SADDR_RULE_PRIVACY:
1669             {
1670                 /* Rule 7: Prefer public address
1671                  * Note: prefer temporary address if use_tempaddr >= 2
1672                  */
1673                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1674                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1675                                 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2;
1676                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1677                 break;
1678             }
1679         case IPV6_SADDR_RULE_ORCHID:
1680                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1681                  *          non-ORCHID vs non-ORCHID
1682                  */
1683                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1684                         ipv6_addr_orchid(dst->addr));
1685                 break;
1686         case IPV6_SADDR_RULE_PREFIX:
1687                 /* Rule 8: Use longest matching prefix */
1688                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1689                 if (ret > score->ifa->prefix_len)
1690                         ret = score->ifa->prefix_len;
1691                 score->matchlen = ret;
1692                 break;
1693 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1694         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1695                 /* Optimistic addresses still have lower precedence than other
1696                  * preferred addresses.
1697                  */
1698                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1699                 break;
1700 #endif
1701         default:
1702                 ret = 0;
1703         }
1704
1705         if (ret)
1706                 __set_bit(i, score->scorebits);
1707         score->rule = i;
1708 out:
1709         return ret;
1710 }
1711
1712 static int __ipv6_dev_get_saddr(struct net *net,
1713                                 struct ipv6_saddr_dst *dst,
1714                                 struct inet6_dev *idev,
1715                                 struct ipv6_saddr_score *scores,
1716                                 int hiscore_idx)
1717 {
1718         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1719
1720         list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1721                 int i;
1722
1723                 /*
1724                  * - Tentative Address (RFC2462 section 5.4)
1725                  *  - A tentative address is not considered
1726                  *    "assigned to an interface" in the traditional
1727                  *    sense, unless it is also flagged as optimistic.
1728                  * - Candidate Source Address (section 4)
1729                  *  - In any case, anycast addresses, multicast
1730                  *    addresses, and the unspecified address MUST
1731                  *    NOT be included in a candidate set.
1732                  */
1733                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1734                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1735                         continue;
1736
1737                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1738
1739                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1740                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1741                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1742                                             idev->dev->name);
1743                         continue;
1744                 }
1745
1746                 score->rule = -1;
1747                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1748
1749                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1750                         int minihiscore, miniscore;
1751
1752                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1753                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1754
1755                         if (minihiscore > miniscore) {
1756                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1757                                     score->scopedist > 0) {
1758                                         /*
1759                                          * special case:
1760                                          * each remaining entry
1761                                          * has too small (not enough)
1762                                          * scope, because ifa entries
1763                                          * are sorted by their scope
1764                                          * values.
1765                                          */
1766                                         goto out;
1767                                 }
1768                                 break;
1769                         } else if (minihiscore < miniscore) {
1770                                 swap(hiscore, score);
1771                                 hiscore_idx = 1 - hiscore_idx;
1772
1773                                 /* restore our iterator */
1774                                 score->ifa = hiscore->ifa;
1775
1776                                 break;
1777                         }
1778                 }
1779         }
1780 out:
1781         return hiscore_idx;
1782 }
1783
1784 static int ipv6_get_saddr_master(struct net *net,
1785                                  const struct net_device *dst_dev,
1786                                  const struct net_device *master,
1787                                  struct ipv6_saddr_dst *dst,
1788                                  struct ipv6_saddr_score *scores,
1789                                  int hiscore_idx)
1790 {
1791         struct inet6_dev *idev;
1792
1793         idev = __in6_dev_get(dst_dev);
1794         if (idev)
1795                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1796                                                    scores, hiscore_idx);
1797
1798         idev = __in6_dev_get(master);
1799         if (idev)
1800                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1801                                                    scores, hiscore_idx);
1802
1803         return hiscore_idx;
1804 }
1805
1806 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1807                        const struct in6_addr *daddr, unsigned int prefs,
1808                        struct in6_addr *saddr)
1809 {
1810         struct ipv6_saddr_score scores[2], *hiscore;
1811         struct ipv6_saddr_dst dst;
1812         struct inet6_dev *idev;
1813         struct net_device *dev;
1814         int dst_type;
1815         bool use_oif_addr = false;
1816         int hiscore_idx = 0;
1817         int ret = 0;
1818
1819         dst_type = __ipv6_addr_type(daddr);
1820         dst.addr = daddr;
1821         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1822         dst.scope = __ipv6_addr_src_scope(dst_type);
1823         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1824         dst.prefs = prefs;
1825
1826         scores[hiscore_idx].rule = -1;
1827         scores[hiscore_idx].ifa = NULL;
1828
1829         rcu_read_lock();
1830
1831         /* Candidate Source Address (section 4)
1832          *  - multicast and link-local destination address,
1833          *    the set of candidate source address MUST only
1834          *    include addresses assigned to interfaces
1835          *    belonging to the same link as the outgoing
1836          *    interface.
1837          * (- For site-local destination addresses, the
1838          *    set of candidate source addresses MUST only
1839          *    include addresses assigned to interfaces
1840          *    belonging to the same site as the outgoing
1841          *    interface.)
1842          *  - "It is RECOMMENDED that the candidate source addresses
1843          *    be the set of unicast addresses assigned to the
1844          *    interface that will be used to send to the destination
1845          *    (the 'outgoing' interface)." (RFC 6724)
1846          */
1847         if (dst_dev) {
1848                 idev = __in6_dev_get(dst_dev);
1849                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1850                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1851                     (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) {
1852                         use_oif_addr = true;
1853                 }
1854         }
1855
1856         if (use_oif_addr) {
1857                 if (idev)
1858                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1859         } else {
1860                 const struct net_device *master;
1861                 int master_idx = 0;
1862
1863                 /* if dst_dev exists and is enslaved to an L3 device, then
1864                  * prefer addresses from dst_dev and then the master over
1865                  * any other enslaved devices in the L3 domain.
1866                  */
1867                 master = l3mdev_master_dev_rcu(dst_dev);
1868                 if (master) {
1869                         master_idx = master->ifindex;
1870
1871                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1872                                                             master, &dst,
1873                                                             scores, hiscore_idx);
1874
1875                         if (scores[hiscore_idx].ifa)
1876                                 goto out;
1877                 }
1878
1879                 for_each_netdev_rcu(net, dev) {
1880                         /* only consider addresses on devices in the
1881                          * same L3 domain
1882                          */
1883                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1884                                 continue;
1885                         idev = __in6_dev_get(dev);
1886                         if (!idev)
1887                                 continue;
1888                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1889                 }
1890         }
1891
1892 out:
1893         hiscore = &scores[hiscore_idx];
1894         if (!hiscore->ifa)
1895                 ret = -EADDRNOTAVAIL;
1896         else
1897                 *saddr = hiscore->ifa->addr;
1898
1899         rcu_read_unlock();
1900         return ret;
1901 }
1902 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1903
1904 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1905                               u32 banned_flags)
1906 {
1907         struct inet6_ifaddr *ifp;
1908         int err = -EADDRNOTAVAIL;
1909
1910         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1911                 if (ifp->scope > IFA_LINK)
1912                         break;
1913                 if (ifp->scope == IFA_LINK &&
1914                     !(ifp->flags & banned_flags)) {
1915                         *addr = ifp->addr;
1916                         err = 0;
1917                         break;
1918                 }
1919         }
1920         return err;
1921 }
1922
1923 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1924                     u32 banned_flags)
1925 {
1926         struct inet6_dev *idev;
1927         int err = -EADDRNOTAVAIL;
1928
1929         rcu_read_lock();
1930         idev = __in6_dev_get(dev);
1931         if (idev) {
1932                 read_lock_bh(&idev->lock);
1933                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1934                 read_unlock_bh(&idev->lock);
1935         }
1936         rcu_read_unlock();
1937         return err;
1938 }
1939
1940 static int ipv6_count_addresses(const struct inet6_dev *idev)
1941 {
1942         const struct inet6_ifaddr *ifp;
1943         int cnt = 0;
1944
1945         rcu_read_lock();
1946         list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1947                 cnt++;
1948         rcu_read_unlock();
1949         return cnt;
1950 }
1951
1952 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1953                   const struct net_device *dev, int strict)
1954 {
1955         return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1956                                        strict, IFA_F_TENTATIVE);
1957 }
1958 EXPORT_SYMBOL(ipv6_chk_addr);
1959
1960 /* device argument is used to find the L3 domain of interest. If
1961  * skip_dev_check is set, then the ifp device is not checked against
1962  * the passed in dev argument. So the 2 cases for addresses checks are:
1963  *   1. does the address exist in the L3 domain that dev is part of
1964  *      (skip_dev_check = true), or
1965  *
1966  *   2. does the address exist on the specific device
1967  *      (skip_dev_check = false)
1968  */
1969 static struct net_device *
1970 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1971                           const struct net_device *dev, bool skip_dev_check,
1972                           int strict, u32 banned_flags)
1973 {
1974         unsigned int hash = inet6_addr_hash(net, addr);
1975         struct net_device *l3mdev, *ndev;
1976         struct inet6_ifaddr *ifp;
1977         u32 ifp_flags;
1978
1979         rcu_read_lock();
1980
1981         l3mdev = l3mdev_master_dev_rcu(dev);
1982         if (skip_dev_check)
1983                 dev = NULL;
1984
1985         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1986                 ndev = ifp->idev->dev;
1987
1988                 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1989                         continue;
1990
1991                 /* Decouple optimistic from tentative for evaluation here.
1992                  * Ban optimistic addresses explicitly, when required.
1993                  */
1994                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1995                             ? (ifp->flags&~IFA_F_TENTATIVE)
1996                             : ifp->flags;
1997                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1998                     !(ifp_flags&banned_flags) &&
1999                     (!dev || ndev == dev ||
2000                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
2001                         rcu_read_unlock();
2002                         return ndev;
2003                 }
2004         }
2005
2006         rcu_read_unlock();
2007         return NULL;
2008 }
2009
2010 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
2011                             const struct net_device *dev, bool skip_dev_check,
2012                             int strict, u32 banned_flags)
2013 {
2014         return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
2015                                          strict, banned_flags) ? 1 : 0;
2016 }
2017 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
2018
2019
2020 /* Compares an address/prefix_len with addresses on device @dev.
2021  * If one is found it returns true.
2022  */
2023 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
2024         const unsigned int prefix_len, struct net_device *dev)
2025 {
2026         const struct inet6_ifaddr *ifa;
2027         const struct inet6_dev *idev;
2028         bool ret = false;
2029
2030         rcu_read_lock();
2031         idev = __in6_dev_get(dev);
2032         if (idev) {
2033                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2034                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
2035                         if (ret)
2036                                 break;
2037                 }
2038         }
2039         rcu_read_unlock();
2040
2041         return ret;
2042 }
2043 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
2044
2045 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
2046 {
2047         const struct inet6_ifaddr *ifa;
2048         const struct inet6_dev *idev;
2049         int     onlink;
2050
2051         onlink = 0;
2052         rcu_read_lock();
2053         idev = __in6_dev_get(dev);
2054         if (idev) {
2055                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2056                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
2057                                                    ifa->prefix_len);
2058                         if (onlink)
2059                                 break;
2060                 }
2061         }
2062         rcu_read_unlock();
2063         return onlink;
2064 }
2065 EXPORT_SYMBOL(ipv6_chk_prefix);
2066
2067 /**
2068  * ipv6_dev_find - find the first device with a given source address.
2069  * @net: the net namespace
2070  * @addr: the source address
2071  * @dev: used to find the L3 domain of interest
2072  *
2073  * The caller should be protected by RCU, or RTNL.
2074  */
2075 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2076                                  struct net_device *dev)
2077 {
2078         return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2079                                          IFA_F_TENTATIVE);
2080 }
2081 EXPORT_SYMBOL(ipv6_dev_find);
2082
2083 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2084                                      struct net_device *dev, int strict)
2085 {
2086         unsigned int hash = inet6_addr_hash(net, addr);
2087         struct inet6_ifaddr *ifp, *result = NULL;
2088
2089         rcu_read_lock();
2090         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2091                 if (ipv6_addr_equal(&ifp->addr, addr)) {
2092                         if (!dev || ifp->idev->dev == dev ||
2093                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2094                                 if (in6_ifa_hold_safe(ifp)) {
2095                                         result = ifp;
2096                                         break;
2097                                 }
2098                         }
2099                 }
2100         }
2101         rcu_read_unlock();
2102
2103         return result;
2104 }
2105
2106 /* Gets referenced address, destroys ifaddr */
2107
2108 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2109 {
2110         if (dad_failed)
2111                 ifp->flags |= IFA_F_DADFAILED;
2112
2113         if (ifp->flags&IFA_F_TEMPORARY) {
2114                 struct inet6_ifaddr *ifpub;
2115                 spin_lock_bh(&ifp->lock);
2116                 ifpub = ifp->ifpub;
2117                 if (ifpub) {
2118                         in6_ifa_hold(ifpub);
2119                         spin_unlock_bh(&ifp->lock);
2120                         ipv6_create_tempaddr(ifpub, true);
2121                         in6_ifa_put(ifpub);
2122                 } else {
2123                         spin_unlock_bh(&ifp->lock);
2124                 }
2125                 ipv6_del_addr(ifp);
2126         } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2127                 spin_lock_bh(&ifp->lock);
2128                 addrconf_del_dad_work(ifp);
2129                 ifp->flags |= IFA_F_TENTATIVE;
2130                 if (dad_failed)
2131                         ifp->flags &= ~IFA_F_OPTIMISTIC;
2132                 spin_unlock_bh(&ifp->lock);
2133                 if (dad_failed)
2134                         ipv6_ifa_notify(0, ifp);
2135                 in6_ifa_put(ifp);
2136         } else {
2137                 ipv6_del_addr(ifp);
2138         }
2139 }
2140
2141 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2142 {
2143         int err = -ENOENT;
2144
2145         spin_lock_bh(&ifp->lock);
2146         if (ifp->state == INET6_IFADDR_STATE_DAD) {
2147                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2148                 err = 0;
2149         }
2150         spin_unlock_bh(&ifp->lock);
2151
2152         return err;
2153 }
2154
2155 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2156 {
2157         struct inet6_dev *idev = ifp->idev;
2158         struct net *net = dev_net(idev->dev);
2159         int max_addresses;
2160
2161         if (addrconf_dad_end(ifp)) {
2162                 in6_ifa_put(ifp);
2163                 return;
2164         }
2165
2166         net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2167                              ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2168
2169         spin_lock_bh(&ifp->lock);
2170
2171         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2172                 struct in6_addr new_addr;
2173                 struct inet6_ifaddr *ifp2;
2174                 int retries = ifp->stable_privacy_retry + 1;
2175                 struct ifa6_config cfg = {
2176                         .pfx = &new_addr,
2177                         .plen = ifp->prefix_len,
2178                         .ifa_flags = ifp->flags,
2179                         .valid_lft = ifp->valid_lft,
2180                         .preferred_lft = ifp->prefered_lft,
2181                         .scope = ifp->scope,
2182                 };
2183
2184                 if (retries > net->ipv6.sysctl.idgen_retries) {
2185                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2186                                              ifp->idev->dev->name);
2187                         goto errdad;
2188                 }
2189
2190                 new_addr = ifp->addr;
2191                 if (ipv6_generate_stable_address(&new_addr, retries,
2192                                                  idev))
2193                         goto errdad;
2194
2195                 spin_unlock_bh(&ifp->lock);
2196
2197                 max_addresses = READ_ONCE(idev->cnf.max_addresses);
2198                 if (max_addresses &&
2199                     ipv6_count_addresses(idev) >= max_addresses)
2200                         goto lock_errdad;
2201
2202                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2203                                      ifp->idev->dev->name);
2204
2205                 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2206                 if (IS_ERR(ifp2))
2207                         goto lock_errdad;
2208
2209                 spin_lock_bh(&ifp2->lock);
2210                 ifp2->stable_privacy_retry = retries;
2211                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2212                 spin_unlock_bh(&ifp2->lock);
2213
2214                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2215                 in6_ifa_put(ifp2);
2216 lock_errdad:
2217                 spin_lock_bh(&ifp->lock);
2218         }
2219
2220 errdad:
2221         /* transition from _POSTDAD to _ERRDAD */
2222         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2223         spin_unlock_bh(&ifp->lock);
2224
2225         addrconf_mod_dad_work(ifp, 0);
2226         in6_ifa_put(ifp);
2227 }
2228
2229 /* Join to solicited addr multicast group.
2230  * caller must hold RTNL */
2231 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2232 {
2233         struct in6_addr maddr;
2234
2235         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2236                 return;
2237
2238         addrconf_addr_solict_mult(addr, &maddr);
2239         ipv6_dev_mc_inc(dev, &maddr);
2240 }
2241
2242 /* caller must hold RTNL */
2243 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2244 {
2245         struct in6_addr maddr;
2246
2247         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2248                 return;
2249
2250         addrconf_addr_solict_mult(addr, &maddr);
2251         __ipv6_dev_mc_dec(idev, &maddr);
2252 }
2253
2254 /* caller must hold RTNL */
2255 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2256 {
2257         struct in6_addr addr;
2258
2259         if (ifp->prefix_len >= 127) /* RFC 6164 */
2260                 return;
2261         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2262         if (ipv6_addr_any(&addr))
2263                 return;
2264         __ipv6_dev_ac_inc(ifp->idev, &addr);
2265 }
2266
2267 /* caller must hold RTNL */
2268 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2269 {
2270         struct in6_addr addr;
2271
2272         if (ifp->prefix_len >= 127) /* RFC 6164 */
2273                 return;
2274         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2275         if (ipv6_addr_any(&addr))
2276                 return;
2277         __ipv6_dev_ac_dec(ifp->idev, &addr);
2278 }
2279
2280 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2281 {
2282         switch (dev->addr_len) {
2283         case ETH_ALEN:
2284                 memcpy(eui, dev->dev_addr, 3);
2285                 eui[3] = 0xFF;
2286                 eui[4] = 0xFE;
2287                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2288                 break;
2289         case EUI64_ADDR_LEN:
2290                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2291                 eui[0] ^= 2;
2292                 break;
2293         default:
2294                 return -1;
2295         }
2296
2297         return 0;
2298 }
2299
2300 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2301 {
2302         const union fwnet_hwaddr *ha;
2303
2304         if (dev->addr_len != FWNET_ALEN)
2305                 return -1;
2306
2307         ha = (const union fwnet_hwaddr *)dev->dev_addr;
2308
2309         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2310         eui[0] ^= 2;
2311         return 0;
2312 }
2313
2314 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2315 {
2316         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2317         if (dev->addr_len != ARCNET_ALEN)
2318                 return -1;
2319         memset(eui, 0, 7);
2320         eui[7] = *(u8 *)dev->dev_addr;
2321         return 0;
2322 }
2323
2324 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2325 {
2326         if (dev->addr_len != INFINIBAND_ALEN)
2327                 return -1;
2328         memcpy(eui, dev->dev_addr + 12, 8);
2329         eui[0] |= 2;
2330         return 0;
2331 }
2332
2333 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2334 {
2335         if (addr == 0)
2336                 return -1;
2337         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2338                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2339                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2340                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2341                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2342                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2343         eui[1] = 0;
2344         eui[2] = 0x5E;
2345         eui[3] = 0xFE;
2346         memcpy(eui + 4, &addr, 4);
2347         return 0;
2348 }
2349
2350 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2351 {
2352         if (dev->priv_flags & IFF_ISATAP)
2353                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2354         return -1;
2355 }
2356
2357 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2358 {
2359         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2360 }
2361
2362 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2363 {
2364         memcpy(eui, dev->perm_addr, 3);
2365         memcpy(eui + 5, dev->perm_addr + 3, 3);
2366         eui[3] = 0xFF;
2367         eui[4] = 0xFE;
2368         eui[0] ^= 2;
2369         return 0;
2370 }
2371
2372 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2373 {
2374         switch (dev->type) {
2375         case ARPHRD_ETHER:
2376         case ARPHRD_FDDI:
2377                 return addrconf_ifid_eui48(eui, dev);
2378         case ARPHRD_ARCNET:
2379                 return addrconf_ifid_arcnet(eui, dev);
2380         case ARPHRD_INFINIBAND:
2381                 return addrconf_ifid_infiniband(eui, dev);
2382         case ARPHRD_SIT:
2383                 return addrconf_ifid_sit(eui, dev);
2384         case ARPHRD_IPGRE:
2385         case ARPHRD_TUNNEL:
2386                 return addrconf_ifid_gre(eui, dev);
2387         case ARPHRD_6LOWPAN:
2388                 return addrconf_ifid_6lowpan(eui, dev);
2389         case ARPHRD_IEEE1394:
2390                 return addrconf_ifid_ieee1394(eui, dev);
2391         case ARPHRD_TUNNEL6:
2392         case ARPHRD_IP6GRE:
2393         case ARPHRD_RAWIP:
2394                 return addrconf_ifid_ip6tnl(eui, dev);
2395         }
2396         return -1;
2397 }
2398
2399 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2400 {
2401         int err = -1;
2402         struct inet6_ifaddr *ifp;
2403
2404         read_lock_bh(&idev->lock);
2405         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2406                 if (ifp->scope > IFA_LINK)
2407                         break;
2408                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2409                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2410                         err = 0;
2411                         break;
2412                 }
2413         }
2414         read_unlock_bh(&idev->lock);
2415         return err;
2416 }
2417
2418 /* Generation of a randomized Interface Identifier
2419  * draft-ietf-6man-rfc4941bis, Section 3.3.1
2420  */
2421
2422 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2423 {
2424 regen:
2425         get_random_bytes(&addr->s6_addr[8], 8);
2426
2427         /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2428          * check if generated address is not inappropriate:
2429          *
2430          * - Reserved IPv6 Interface Identifiers
2431          * - XXX: already assigned to an address on the device
2432          */
2433
2434         /* Subnet-router anycast: 0000:0000:0000:0000 */
2435         if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2436                 goto regen;
2437
2438         /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2439          * Proxy Mobile IPv6:   0200:5EFF:FE00:5213
2440          * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2441          */
2442         if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2443             (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2444                 goto regen;
2445
2446         /* Reserved subnet anycast addresses */
2447         if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2448             ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2449                 goto regen;
2450 }
2451
2452 /*
2453  *      Add prefix route.
2454  */
2455
2456 static void
2457 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2458                       struct net_device *dev, unsigned long expires,
2459                       u32 flags, gfp_t gfp_flags)
2460 {
2461         struct fib6_config cfg = {
2462                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2463                 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2464                 .fc_ifindex = dev->ifindex,
2465                 .fc_expires = expires,
2466                 .fc_dst_len = plen,
2467                 .fc_flags = RTF_UP | flags,
2468                 .fc_nlinfo.nl_net = dev_net(dev),
2469                 .fc_protocol = RTPROT_KERNEL,
2470                 .fc_type = RTN_UNICAST,
2471         };
2472
2473         cfg.fc_dst = *pfx;
2474
2475         /* Prevent useless cloning on PtP SIT.
2476            This thing is done here expecting that the whole
2477            class of non-broadcast devices need not cloning.
2478          */
2479 #if IS_ENABLED(CONFIG_IPV6_SIT)
2480         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2481                 cfg.fc_flags |= RTF_NONEXTHOP;
2482 #endif
2483
2484         ip6_route_add(&cfg, gfp_flags, NULL);
2485 }
2486
2487
2488 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2489                                                   int plen,
2490                                                   const struct net_device *dev,
2491                                                   u32 flags, u32 noflags,
2492                                                   bool no_gw)
2493 {
2494         struct fib6_node *fn;
2495         struct fib6_info *rt = NULL;
2496         struct fib6_table *table;
2497         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2498
2499         table = fib6_get_table(dev_net(dev), tb_id);
2500         if (!table)
2501                 return NULL;
2502
2503         rcu_read_lock();
2504         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2505         if (!fn)
2506                 goto out;
2507
2508         for_each_fib6_node_rt_rcu(fn) {
2509                 /* prefix routes only use builtin fib6_nh */
2510                 if (rt->nh)
2511                         continue;
2512
2513                 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2514                         continue;
2515                 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2516                         continue;
2517                 if ((rt->fib6_flags & flags) != flags)
2518                         continue;
2519                 if ((rt->fib6_flags & noflags) != 0)
2520                         continue;
2521                 if (!fib6_info_hold_safe(rt))
2522                         continue;
2523                 break;
2524         }
2525 out:
2526         rcu_read_unlock();
2527         return rt;
2528 }
2529
2530
2531 /* Create "default" multicast route to the interface */
2532
2533 static void addrconf_add_mroute(struct net_device *dev)
2534 {
2535         struct fib6_config cfg = {
2536                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2537                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2538                 .fc_ifindex = dev->ifindex,
2539                 .fc_dst_len = 8,
2540                 .fc_flags = RTF_UP,
2541                 .fc_type = RTN_MULTICAST,
2542                 .fc_nlinfo.nl_net = dev_net(dev),
2543                 .fc_protocol = RTPROT_KERNEL,
2544         };
2545
2546         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2547
2548         ip6_route_add(&cfg, GFP_KERNEL, NULL);
2549 }
2550
2551 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2552 {
2553         struct inet6_dev *idev;
2554
2555         ASSERT_RTNL();
2556
2557         idev = ipv6_find_idev(dev);
2558         if (IS_ERR(idev))
2559                 return idev;
2560
2561         if (idev->cnf.disable_ipv6)
2562                 return ERR_PTR(-EACCES);
2563
2564         /* Add default multicast route */
2565         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2566                 addrconf_add_mroute(dev);
2567
2568         return idev;
2569 }
2570
2571 static void manage_tempaddrs(struct inet6_dev *idev,
2572                              struct inet6_ifaddr *ifp,
2573                              __u32 valid_lft, __u32 prefered_lft,
2574                              bool create, unsigned long now)
2575 {
2576         u32 flags;
2577         struct inet6_ifaddr *ift;
2578
2579         read_lock_bh(&idev->lock);
2580         /* update all temporary addresses in the list */
2581         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2582                 int age, max_valid, max_prefered;
2583
2584                 if (ifp != ift->ifpub)
2585                         continue;
2586
2587                 /* RFC 4941 section 3.3:
2588                  * If a received option will extend the lifetime of a public
2589                  * address, the lifetimes of temporary addresses should
2590                  * be extended, subject to the overall constraint that no
2591                  * temporary addresses should ever remain "valid" or "preferred"
2592                  * for a time longer than (TEMP_VALID_LIFETIME) or
2593                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2594                  */
2595                 age = (now - ift->cstamp) / HZ;
2596                 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age;
2597                 if (max_valid < 0)
2598                         max_valid = 0;
2599
2600                 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) -
2601                                idev->desync_factor - age;
2602                 if (max_prefered < 0)
2603                         max_prefered = 0;
2604
2605                 if (valid_lft > max_valid)
2606                         valid_lft = max_valid;
2607
2608                 if (prefered_lft > max_prefered)
2609                         prefered_lft = max_prefered;
2610
2611                 spin_lock(&ift->lock);
2612                 flags = ift->flags;
2613                 ift->valid_lft = valid_lft;
2614                 ift->prefered_lft = prefered_lft;
2615                 ift->tstamp = now;
2616                 if (prefered_lft > 0)
2617                         ift->flags &= ~IFA_F_DEPRECATED;
2618
2619                 spin_unlock(&ift->lock);
2620                 if (!(flags&IFA_F_TENTATIVE))
2621                         ipv6_ifa_notify(0, ift);
2622         }
2623
2624         /* Also create a temporary address if it's enabled but no temporary
2625          * address currently exists.
2626          * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2627          * as part of cleanup (ie. deleting the mngtmpaddr).
2628          * We don't want that to result in creating a new temporary ip address.
2629          */
2630         if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2631                 create = true;
2632
2633         if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) {
2634                 /* When a new public address is created as described
2635                  * in [ADDRCONF], also create a new temporary address.
2636                  */
2637                 read_unlock_bh(&idev->lock);
2638                 ipv6_create_tempaddr(ifp, false);
2639         } else {
2640                 read_unlock_bh(&idev->lock);
2641         }
2642 }
2643
2644 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2645 {
2646         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2647                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2648 }
2649
2650 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2651                                  const struct prefix_info *pinfo,
2652                                  struct inet6_dev *in6_dev,
2653                                  const struct in6_addr *addr, int addr_type,
2654                                  u32 addr_flags, bool sllao, bool tokenized,
2655                                  __u32 valid_lft, u32 prefered_lft)
2656 {
2657         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2658         int create = 0, update_lft = 0;
2659
2660         if (!ifp && valid_lft) {
2661                 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses);
2662                 struct ifa6_config cfg = {
2663                         .pfx = addr,
2664                         .plen = pinfo->prefix_len,
2665                         .ifa_flags = addr_flags,
2666                         .valid_lft = valid_lft,
2667                         .preferred_lft = prefered_lft,
2668                         .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2669                         .ifa_proto = IFAPROT_KERNEL_RA
2670                 };
2671
2672 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2673                 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) ||
2674                      READ_ONCE(in6_dev->cnf.optimistic_dad)) &&
2675                     !net->ipv6.devconf_all->forwarding && sllao)
2676                         cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2677 #endif
2678
2679                 /* Do not allow to create too much of autoconfigured
2680                  * addresses; this would be too easy way to crash kernel.
2681                  */
2682                 if (!max_addresses ||
2683                     ipv6_count_addresses(in6_dev) < max_addresses)
2684                         ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2685
2686                 if (IS_ERR_OR_NULL(ifp))
2687                         return -1;
2688
2689                 create = 1;
2690                 spin_lock_bh(&ifp->lock);
2691                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2692                 ifp->cstamp = jiffies;
2693                 ifp->tokenized = tokenized;
2694                 spin_unlock_bh(&ifp->lock);
2695                 addrconf_dad_start(ifp);
2696         }
2697
2698         if (ifp) {
2699                 u32 flags;
2700                 unsigned long now;
2701                 u32 stored_lft;
2702
2703                 /* update lifetime (RFC2462 5.5.3 e) */
2704                 spin_lock_bh(&ifp->lock);
2705                 now = jiffies;
2706                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2707                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2708                 else
2709                         stored_lft = 0;
2710
2711                 /* RFC4862 Section 5.5.3e:
2712                  * "Note that the preferred lifetime of the
2713                  *  corresponding address is always reset to
2714                  *  the Preferred Lifetime in the received
2715                  *  Prefix Information option, regardless of
2716                  *  whether the valid lifetime is also reset or
2717                  *  ignored."
2718                  *
2719                  * So we should always update prefered_lft here.
2720                  */
2721                 update_lft = !create && stored_lft;
2722
2723                 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) {
2724                         const u32 minimum_lft = min_t(u32,
2725                                 stored_lft, MIN_VALID_LIFETIME);
2726                         valid_lft = max(valid_lft, minimum_lft);
2727                 }
2728
2729                 if (update_lft) {
2730                         ifp->valid_lft = valid_lft;
2731                         ifp->prefered_lft = prefered_lft;
2732                         WRITE_ONCE(ifp->tstamp, now);
2733                         flags = ifp->flags;
2734                         ifp->flags &= ~IFA_F_DEPRECATED;
2735                         spin_unlock_bh(&ifp->lock);
2736
2737                         if (!(flags&IFA_F_TENTATIVE))
2738                                 ipv6_ifa_notify(0, ifp);
2739                 } else
2740                         spin_unlock_bh(&ifp->lock);
2741
2742                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2743                                  create, now);
2744
2745                 in6_ifa_put(ifp);
2746                 addrconf_verify(net);
2747         }
2748
2749         return 0;
2750 }
2751 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2752
2753 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2754 {
2755         struct prefix_info *pinfo;
2756         struct fib6_table *table;
2757         __u32 valid_lft;
2758         __u32 prefered_lft;
2759         int addr_type, err;
2760         u32 addr_flags = 0;
2761         struct inet6_dev *in6_dev;
2762         struct net *net = dev_net(dev);
2763
2764         pinfo = (struct prefix_info *) opt;
2765
2766         if (len < sizeof(struct prefix_info)) {
2767                 netdev_dbg(dev, "addrconf: prefix option too short\n");
2768                 return;
2769         }
2770
2771         /*
2772          *      Validation checks ([ADDRCONF], page 19)
2773          */
2774
2775         addr_type = ipv6_addr_type(&pinfo->prefix);
2776
2777         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2778                 return;
2779
2780         valid_lft = ntohl(pinfo->valid);
2781         prefered_lft = ntohl(pinfo->prefered);
2782
2783         if (prefered_lft > valid_lft) {
2784                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2785                 return;
2786         }
2787
2788         in6_dev = in6_dev_get(dev);
2789
2790         if (!in6_dev) {
2791                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2792                                     dev->name);
2793                 return;
2794         }
2795
2796         if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2797                 goto put;
2798
2799         /*
2800          *      Two things going on here:
2801          *      1) Add routes for on-link prefixes
2802          *      2) Configure prefixes with the auto flag set
2803          */
2804
2805         if (pinfo->onlink) {
2806                 struct fib6_info *rt;
2807                 unsigned long rt_expires;
2808
2809                 /* Avoid arithmetic overflow. Really, we could
2810                  * save rt_expires in seconds, likely valid_lft,
2811                  * but it would require division in fib gc, that it
2812                  * not good.
2813                  */
2814                 if (HZ > USER_HZ)
2815                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2816                 else
2817                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2818
2819                 if (addrconf_finite_timeout(rt_expires))
2820                         rt_expires *= HZ;
2821
2822                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2823                                                pinfo->prefix_len,
2824                                                dev,
2825                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2826                                                RTF_DEFAULT, true);
2827
2828                 if (rt) {
2829                         /* Autoconf prefix route */
2830                         if (valid_lft == 0) {
2831                                 ip6_del_rt(net, rt, false);
2832                                 rt = NULL;
2833                         } else {
2834                                 table = rt->fib6_table;
2835                                 spin_lock_bh(&table->tb6_lock);
2836
2837                                 if (addrconf_finite_timeout(rt_expires)) {
2838                                         /* not infinity */
2839                                         fib6_set_expires(rt, jiffies + rt_expires);
2840                                         fib6_add_gc_list(rt);
2841                                 } else {
2842                                         fib6_clean_expires(rt);
2843                                         fib6_remove_gc_list(rt);
2844                                 }
2845
2846                                 spin_unlock_bh(&table->tb6_lock);
2847                         }
2848                 } else if (valid_lft) {
2849                         clock_t expires = 0;
2850                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2851                         if (addrconf_finite_timeout(rt_expires)) {
2852                                 /* not infinity */
2853                                 flags |= RTF_EXPIRES;
2854                                 expires = jiffies_to_clock_t(rt_expires);
2855                         }
2856                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2857                                               0, dev, expires, flags,
2858                                               GFP_ATOMIC);
2859                 }
2860                 fib6_info_release(rt);
2861         }
2862
2863         /* Try to figure out our local address for this prefix */
2864
2865         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2866                 struct in6_addr addr;
2867                 bool tokenized = false, dev_addr_generated = false;
2868
2869                 if (pinfo->prefix_len == 64) {
2870                         memcpy(&addr, &pinfo->prefix, 8);
2871
2872                         if (!ipv6_addr_any(&in6_dev->token)) {
2873                                 read_lock_bh(&in6_dev->lock);
2874                                 memcpy(addr.s6_addr + 8,
2875                                        in6_dev->token.s6_addr + 8, 8);
2876                                 read_unlock_bh(&in6_dev->lock);
2877                                 tokenized = true;
2878                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2879                                    !ipv6_generate_stable_address(&addr, 0,
2880                                                                  in6_dev)) {
2881                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2882                                 goto ok;
2883                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2884                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2885                                 goto put;
2886                         } else {
2887                                 dev_addr_generated = true;
2888                         }
2889                         goto ok;
2890                 }
2891                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2892                                     pinfo->prefix_len);
2893                 goto put;
2894
2895 ok:
2896                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2897                                                    &addr, addr_type,
2898                                                    addr_flags, sllao,
2899                                                    tokenized, valid_lft,
2900                                                    prefered_lft);
2901                 if (err)
2902                         goto put;
2903
2904                 /* Ignore error case here because previous prefix add addr was
2905                  * successful which will be notified.
2906                  */
2907                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2908                                               addr_type, addr_flags, sllao,
2909                                               tokenized, valid_lft,
2910                                               prefered_lft,
2911                                               dev_addr_generated);
2912         }
2913         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2914 put:
2915         in6_dev_put(in6_dev);
2916 }
2917
2918 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2919                 struct in6_ifreq *ireq)
2920 {
2921         struct ip_tunnel_parm p = { };
2922         int err;
2923
2924         if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2925                 return -EADDRNOTAVAIL;
2926
2927         p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2928         p.iph.version = 4;
2929         p.iph.ihl = 5;
2930         p.iph.protocol = IPPROTO_IPV6;
2931         p.iph.ttl = 64;
2932
2933         if (!dev->netdev_ops->ndo_tunnel_ctl)
2934                 return -EOPNOTSUPP;
2935         err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2936         if (err)
2937                 return err;
2938
2939         dev = __dev_get_by_name(net, p.name);
2940         if (!dev)
2941                 return -ENOBUFS;
2942         return dev_open(dev, NULL);
2943 }
2944
2945 /*
2946  *      Set destination address.
2947  *      Special case for SIT interfaces where we create a new "virtual"
2948  *      device.
2949  */
2950 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2951 {
2952         struct net_device *dev;
2953         struct in6_ifreq ireq;
2954         int err = -ENODEV;
2955
2956         if (!IS_ENABLED(CONFIG_IPV6_SIT))
2957                 return -ENODEV;
2958         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2959                 return -EFAULT;
2960
2961         rtnl_lock();
2962         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2963         if (dev && dev->type == ARPHRD_SIT)
2964                 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2965         rtnl_unlock();
2966         return err;
2967 }
2968
2969 static int ipv6_mc_config(struct sock *sk, bool join,
2970                           const struct in6_addr *addr, int ifindex)
2971 {
2972         int ret;
2973
2974         ASSERT_RTNL();
2975
2976         lock_sock(sk);
2977         if (join)
2978                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2979         else
2980                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2981         release_sock(sk);
2982
2983         return ret;
2984 }
2985
2986 /*
2987  *      Manual configuration of address on an interface
2988  */
2989 static int inet6_addr_add(struct net *net, int ifindex,
2990                           struct ifa6_config *cfg,
2991                           struct netlink_ext_ack *extack)
2992 {
2993         struct inet6_ifaddr *ifp;
2994         struct inet6_dev *idev;
2995         struct net_device *dev;
2996         unsigned long timeout;
2997         clock_t expires;
2998         u32 flags;
2999
3000         ASSERT_RTNL();
3001
3002         if (cfg->plen > 128) {
3003                 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3004                 return -EINVAL;
3005         }
3006
3007         /* check the lifetime */
3008         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
3009                 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
3010                 return -EINVAL;
3011         }
3012
3013         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
3014                 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
3015                 return -EINVAL;
3016         }
3017
3018         dev = __dev_get_by_index(net, ifindex);
3019         if (!dev)
3020                 return -ENODEV;
3021
3022         idev = addrconf_add_dev(dev);
3023         if (IS_ERR(idev)) {
3024                 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3025                 return PTR_ERR(idev);
3026         }
3027
3028         if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3029                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3030                                          true, cfg->pfx, ifindex);
3031
3032                 if (ret < 0) {
3033                         NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3034                         return ret;
3035                 }
3036         }
3037
3038         cfg->scope = ipv6_addr_scope(cfg->pfx);
3039
3040         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
3041         if (addrconf_finite_timeout(timeout)) {
3042                 expires = jiffies_to_clock_t(timeout * HZ);
3043                 cfg->valid_lft = timeout;
3044                 flags = RTF_EXPIRES;
3045         } else {
3046                 expires = 0;
3047                 flags = 0;
3048                 cfg->ifa_flags |= IFA_F_PERMANENT;
3049         }
3050
3051         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
3052         if (addrconf_finite_timeout(timeout)) {
3053                 if (timeout == 0)
3054                         cfg->ifa_flags |= IFA_F_DEPRECATED;
3055                 cfg->preferred_lft = timeout;
3056         }
3057
3058         ifp = ipv6_add_addr(idev, cfg, true, extack);
3059         if (!IS_ERR(ifp)) {
3060                 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3061                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3062                                               ifp->rt_priority, dev, expires,
3063                                               flags, GFP_KERNEL);
3064                 }
3065
3066                 /* Send a netlink notification if DAD is enabled and
3067                  * optimistic flag is not set
3068                  */
3069                 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3070                         ipv6_ifa_notify(0, ifp);
3071                 /*
3072                  * Note that section 3.1 of RFC 4429 indicates
3073                  * that the Optimistic flag should not be set for
3074                  * manually configured addresses
3075                  */
3076                 addrconf_dad_start(ifp);
3077                 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3078                         manage_tempaddrs(idev, ifp, cfg->valid_lft,
3079                                          cfg->preferred_lft, true, jiffies);
3080                 in6_ifa_put(ifp);
3081                 addrconf_verify_rtnl(net);
3082                 return 0;
3083         } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3084                 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3085                                cfg->pfx, ifindex);
3086         }
3087
3088         return PTR_ERR(ifp);
3089 }
3090
3091 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3092                           const struct in6_addr *pfx, unsigned int plen,
3093                           struct netlink_ext_ack *extack)
3094 {
3095         struct inet6_ifaddr *ifp;
3096         struct inet6_dev *idev;
3097         struct net_device *dev;
3098
3099         if (plen > 128) {
3100                 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3101                 return -EINVAL;
3102         }
3103
3104         dev = __dev_get_by_index(net, ifindex);
3105         if (!dev) {
3106                 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3107                 return -ENODEV;
3108         }
3109
3110         idev = __in6_dev_get(dev);
3111         if (!idev) {
3112                 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3113                 return -ENXIO;
3114         }
3115
3116         read_lock_bh(&idev->lock);
3117         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3118                 if (ifp->prefix_len == plen &&
3119                     ipv6_addr_equal(pfx, &ifp->addr)) {
3120                         in6_ifa_hold(ifp);
3121                         read_unlock_bh(&idev->lock);
3122
3123                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
3124                             (ifa_flags & IFA_F_MANAGETEMPADDR))
3125                                 manage_tempaddrs(idev, ifp, 0, 0, false,
3126                                                  jiffies);
3127                         ipv6_del_addr(ifp);
3128                         addrconf_verify_rtnl(net);
3129                         if (ipv6_addr_is_multicast(pfx)) {
3130                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3131                                                false, pfx, dev->ifindex);
3132                         }
3133                         return 0;
3134                 }
3135         }
3136         read_unlock_bh(&idev->lock);
3137
3138         NL_SET_ERR_MSG_MOD(extack, "address not found");
3139         return -EADDRNOTAVAIL;
3140 }
3141
3142
3143 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3144 {
3145         struct ifa6_config cfg = {
3146                 .ifa_flags = IFA_F_PERMANENT,
3147                 .preferred_lft = INFINITY_LIFE_TIME,
3148                 .valid_lft = INFINITY_LIFE_TIME,
3149         };
3150         struct in6_ifreq ireq;
3151         int err;
3152
3153         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3154                 return -EPERM;
3155
3156         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3157                 return -EFAULT;
3158
3159         cfg.pfx = &ireq.ifr6_addr;
3160         cfg.plen = ireq.ifr6_prefixlen;
3161
3162         rtnl_lock();
3163         err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3164         rtnl_unlock();
3165         return err;
3166 }
3167
3168 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3169 {
3170         struct in6_ifreq ireq;
3171         int err;
3172
3173         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3174                 return -EPERM;
3175
3176         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3177                 return -EFAULT;
3178
3179         rtnl_lock();
3180         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3181                              ireq.ifr6_prefixlen, NULL);
3182         rtnl_unlock();
3183         return err;
3184 }
3185
3186 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3187                      int plen, int scope, u8 proto)
3188 {
3189         struct inet6_ifaddr *ifp;
3190         struct ifa6_config cfg = {
3191                 .pfx = addr,
3192                 .plen = plen,
3193                 .ifa_flags = IFA_F_PERMANENT,
3194                 .valid_lft = INFINITY_LIFE_TIME,
3195                 .preferred_lft = INFINITY_LIFE_TIME,
3196                 .scope = scope,
3197                 .ifa_proto = proto
3198         };
3199
3200         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3201         if (!IS_ERR(ifp)) {
3202                 spin_lock_bh(&ifp->lock);
3203                 ifp->flags &= ~IFA_F_TENTATIVE;
3204                 spin_unlock_bh(&ifp->lock);
3205                 rt_genid_bump_ipv6(dev_net(idev->dev));
3206                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3207                 in6_ifa_put(ifp);
3208         }
3209 }
3210
3211 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3212 static void add_v4_addrs(struct inet6_dev *idev)
3213 {
3214         struct in6_addr addr;
3215         struct net_device *dev;
3216         struct net *net = dev_net(idev->dev);
3217         int scope, plen, offset = 0;
3218         u32 pflags = 0;
3219
3220         ASSERT_RTNL();
3221
3222         memset(&addr, 0, sizeof(struct in6_addr));
3223         /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3224         if (idev->dev->addr_len == sizeof(struct in6_addr))
3225                 offset = sizeof(struct in6_addr) - 4;
3226         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3227
3228         if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3229                 scope = IPV6_ADDR_COMPATv4;
3230                 plen = 96;
3231                 pflags |= RTF_NONEXTHOP;
3232         } else {
3233                 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3234                         return;
3235
3236                 addr.s6_addr32[0] = htonl(0xfe800000);
3237                 scope = IFA_LINK;
3238                 plen = 64;
3239         }
3240
3241         if (addr.s6_addr32[3]) {
3242                 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3243                 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3244                                       GFP_KERNEL);
3245                 return;
3246         }
3247
3248         for_each_netdev(net, dev) {
3249                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3250                 if (in_dev && (dev->flags & IFF_UP)) {
3251                         struct in_ifaddr *ifa;
3252                         int flag = scope;
3253
3254                         in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3255                                 addr.s6_addr32[3] = ifa->ifa_local;
3256
3257                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
3258                                         continue;
3259                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3260                                         if (idev->dev->flags&IFF_POINTOPOINT)
3261                                                 continue;
3262                                         flag |= IFA_HOST;
3263                                 }
3264
3265                                 add_addr(idev, &addr, plen, flag,
3266                                          IFAPROT_UNSPEC);
3267                                 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3268                                                       0, pflags, GFP_KERNEL);
3269                         }
3270                 }
3271         }
3272 }
3273 #endif
3274
3275 static void init_loopback(struct net_device *dev)
3276 {
3277         struct inet6_dev  *idev;
3278
3279         /* ::1 */
3280
3281         ASSERT_RTNL();
3282
3283         idev = ipv6_find_idev(dev);
3284         if (IS_ERR(idev)) {
3285                 pr_debug("%s: add_dev failed\n", __func__);
3286                 return;
3287         }
3288
3289         add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3290 }
3291
3292 void addrconf_add_linklocal(struct inet6_dev *idev,
3293                             const struct in6_addr *addr, u32 flags)
3294 {
3295         struct ifa6_config cfg = {
3296                 .pfx = addr,
3297                 .plen = 64,
3298                 .ifa_flags = flags | IFA_F_PERMANENT,
3299                 .valid_lft = INFINITY_LIFE_TIME,
3300                 .preferred_lft = INFINITY_LIFE_TIME,
3301                 .scope = IFA_LINK,
3302                 .ifa_proto = IFAPROT_KERNEL_LL
3303         };
3304         struct inet6_ifaddr *ifp;
3305
3306 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3307         if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) ||
3308              READ_ONCE(idev->cnf.optimistic_dad)) &&
3309             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3310                 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3311 #endif
3312
3313         ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3314         if (!IS_ERR(ifp)) {
3315                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3316                                       0, 0, GFP_ATOMIC);
3317                 addrconf_dad_start(ifp);
3318                 in6_ifa_put(ifp);
3319         }
3320 }
3321 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3322
3323 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3324 {
3325         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3326                 return true;
3327
3328         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3329             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3330                 return true;
3331
3332         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3333             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3334                 return true;
3335
3336         return false;
3337 }
3338
3339 static int ipv6_generate_stable_address(struct in6_addr *address,
3340                                         u8 dad_count,
3341                                         const struct inet6_dev *idev)
3342 {
3343         static DEFINE_SPINLOCK(lock);
3344         static __u32 digest[SHA1_DIGEST_WORDS];
3345         static __u32 workspace[SHA1_WORKSPACE_WORDS];
3346
3347         static union {
3348                 char __data[SHA1_BLOCK_SIZE];
3349                 struct {
3350                         struct in6_addr secret;
3351                         __be32 prefix[2];
3352                         unsigned char hwaddr[MAX_ADDR_LEN];
3353                         u8 dad_count;
3354                 } __packed;
3355         } data;
3356
3357         struct in6_addr secret;
3358         struct in6_addr temp;
3359         struct net *net = dev_net(idev->dev);
3360
3361         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3362
3363         if (idev->cnf.stable_secret.initialized)
3364                 secret = idev->cnf.stable_secret.secret;
3365         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3366                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3367         else
3368                 return -1;
3369
3370 retry:
3371         spin_lock_bh(&lock);
3372
3373         sha1_init(digest);
3374         memset(&data, 0, sizeof(data));
3375         memset(workspace, 0, sizeof(workspace));
3376         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3377         data.prefix[0] = address->s6_addr32[0];
3378         data.prefix[1] = address->s6_addr32[1];
3379         data.secret = secret;
3380         data.dad_count = dad_count;
3381
3382         sha1_transform(digest, data.__data, workspace);
3383
3384         temp = *address;
3385         temp.s6_addr32[2] = (__force __be32)digest[0];
3386         temp.s6_addr32[3] = (__force __be32)digest[1];
3387
3388         spin_unlock_bh(&lock);
3389
3390         if (ipv6_reserved_interfaceid(temp)) {
3391                 dad_count++;
3392                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3393                         return -1;
3394                 goto retry;
3395         }
3396
3397         *address = temp;
3398         return 0;
3399 }
3400
3401 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3402 {
3403         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3404
3405         if (s->initialized)
3406                 return;
3407         s = &idev->cnf.stable_secret;
3408         get_random_bytes(&s->secret, sizeof(s->secret));
3409         s->initialized = true;
3410 }
3411
3412 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3413 {
3414         struct in6_addr addr;
3415
3416         /* no link local addresses on L3 master devices */
3417         if (netif_is_l3_master(idev->dev))
3418                 return;
3419
3420         /* no link local addresses on devices flagged as slaves */
3421         if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3422                 return;
3423
3424         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3425
3426         switch (idev->cnf.addr_gen_mode) {
3427         case IN6_ADDR_GEN_MODE_RANDOM:
3428                 ipv6_gen_mode_random_init(idev);
3429                 fallthrough;
3430         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3431                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3432                         addrconf_add_linklocal(idev, &addr,
3433                                                IFA_F_STABLE_PRIVACY);
3434                 else if (prefix_route)
3435                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3436                                               0, 0, GFP_KERNEL);
3437                 break;
3438         case IN6_ADDR_GEN_MODE_EUI64:
3439                 /* addrconf_add_linklocal also adds a prefix_route and we
3440                  * only need to care about prefix routes if ipv6_generate_eui64
3441                  * couldn't generate one.
3442                  */
3443                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3444                         addrconf_add_linklocal(idev, &addr, 0);
3445                 else if (prefix_route)
3446                         addrconf_prefix_route(&addr, 64, 0, idev->dev,
3447                                               0, 0, GFP_KERNEL);
3448                 break;
3449         case IN6_ADDR_GEN_MODE_NONE:
3450         default:
3451                 /* will not add any link local address */
3452                 break;
3453         }
3454 }
3455
3456 static void addrconf_dev_config(struct net_device *dev)
3457 {
3458         struct inet6_dev *idev;
3459
3460         ASSERT_RTNL();
3461
3462         if ((dev->type != ARPHRD_ETHER) &&
3463             (dev->type != ARPHRD_FDDI) &&
3464             (dev->type != ARPHRD_ARCNET) &&
3465             (dev->type != ARPHRD_INFINIBAND) &&
3466             (dev->type != ARPHRD_IEEE1394) &&
3467             (dev->type != ARPHRD_TUNNEL6) &&
3468             (dev->type != ARPHRD_6LOWPAN) &&
3469             (dev->type != ARPHRD_TUNNEL) &&
3470             (dev->type != ARPHRD_NONE) &&
3471             (dev->type != ARPHRD_RAWIP)) {
3472                 /* Alas, we support only Ethernet autoconfiguration. */
3473                 idev = __in6_dev_get(dev);
3474                 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3475                     dev->flags & IFF_MULTICAST)
3476                         ipv6_mc_up(idev);
3477                 return;
3478         }
3479
3480         idev = addrconf_add_dev(dev);
3481         if (IS_ERR(idev))
3482                 return;
3483
3484         /* this device type has no EUI support */
3485         if (dev->type == ARPHRD_NONE &&
3486             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3487                 WRITE_ONCE(idev->cnf.addr_gen_mode,
3488                            IN6_ADDR_GEN_MODE_RANDOM);
3489
3490         addrconf_addr_gen(idev, false);
3491 }
3492
3493 #if IS_ENABLED(CONFIG_IPV6_SIT)
3494 static void addrconf_sit_config(struct net_device *dev)
3495 {
3496         struct inet6_dev *idev;
3497
3498         ASSERT_RTNL();
3499
3500         /*
3501          * Configure the tunnel with one of our IPv4
3502          * addresses... we should configure all of
3503          * our v4 addrs in the tunnel
3504          */
3505
3506         idev = ipv6_find_idev(dev);
3507         if (IS_ERR(idev)) {
3508                 pr_debug("%s: add_dev failed\n", __func__);
3509                 return;
3510         }
3511
3512         if (dev->priv_flags & IFF_ISATAP) {
3513                 addrconf_addr_gen(idev, false);
3514                 return;
3515         }
3516
3517         add_v4_addrs(idev);
3518
3519         if (dev->flags&IFF_POINTOPOINT)
3520                 addrconf_add_mroute(dev);
3521 }
3522 #endif
3523
3524 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3525 static void addrconf_gre_config(struct net_device *dev)
3526 {
3527         struct inet6_dev *idev;
3528
3529         ASSERT_RTNL();
3530
3531         idev = ipv6_find_idev(dev);
3532         if (IS_ERR(idev)) {
3533                 pr_debug("%s: add_dev failed\n", __func__);
3534                 return;
3535         }
3536
3537         if (dev->type == ARPHRD_ETHER) {
3538                 addrconf_addr_gen(idev, true);
3539                 return;
3540         }
3541
3542         add_v4_addrs(idev);
3543
3544         if (dev->flags & IFF_POINTOPOINT)
3545                 addrconf_add_mroute(dev);
3546 }
3547 #endif
3548
3549 static void addrconf_init_auto_addrs(struct net_device *dev)
3550 {
3551         switch (dev->type) {
3552 #if IS_ENABLED(CONFIG_IPV6_SIT)
3553         case ARPHRD_SIT:
3554                 addrconf_sit_config(dev);
3555                 break;
3556 #endif
3557 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3558         case ARPHRD_IP6GRE:
3559         case ARPHRD_IPGRE:
3560                 addrconf_gre_config(dev);
3561                 break;
3562 #endif
3563         case ARPHRD_LOOPBACK:
3564                 init_loopback(dev);
3565                 break;
3566
3567         default:
3568                 addrconf_dev_config(dev);
3569                 break;
3570         }
3571 }
3572
3573 static int fixup_permanent_addr(struct net *net,
3574                                 struct inet6_dev *idev,
3575                                 struct inet6_ifaddr *ifp)
3576 {
3577         /* !fib6_node means the host route was removed from the
3578          * FIB, for example, if 'lo' device is taken down. In that
3579          * case regenerate the host route.
3580          */
3581         if (!ifp->rt || !ifp->rt->fib6_node) {
3582                 struct fib6_info *f6i, *prev;
3583
3584                 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3585                                          GFP_ATOMIC, NULL);
3586                 if (IS_ERR(f6i))
3587                         return PTR_ERR(f6i);
3588
3589                 /* ifp->rt can be accessed outside of rtnl */
3590                 spin_lock(&ifp->lock);
3591                 prev = ifp->rt;
3592                 ifp->rt = f6i;
3593                 spin_unlock(&ifp->lock);
3594
3595                 fib6_info_release(prev);
3596         }
3597
3598         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3599                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3600                                       ifp->rt_priority, idev->dev, 0, 0,
3601                                       GFP_ATOMIC);
3602         }
3603
3604         if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3605                 addrconf_dad_start(ifp);
3606
3607         return 0;
3608 }
3609
3610 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3611 {
3612         struct inet6_ifaddr *ifp, *tmp;
3613         struct inet6_dev *idev;
3614
3615         idev = __in6_dev_get(dev);
3616         if (!idev)
3617                 return;
3618
3619         write_lock_bh(&idev->lock);
3620
3621         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3622                 if ((ifp->flags & IFA_F_PERMANENT) &&
3623                     fixup_permanent_addr(net, idev, ifp) < 0) {
3624                         write_unlock_bh(&idev->lock);
3625                         in6_ifa_hold(ifp);
3626                         ipv6_del_addr(ifp);
3627                         write_lock_bh(&idev->lock);
3628
3629                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3630                                              idev->dev->name, &ifp->addr);
3631                 }
3632         }
3633
3634         write_unlock_bh(&idev->lock);
3635 }
3636
3637 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3638                            void *ptr)
3639 {
3640         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3641         struct netdev_notifier_change_info *change_info;
3642         struct netdev_notifier_changeupper_info *info;
3643         struct inet6_dev *idev = __in6_dev_get(dev);
3644         struct net *net = dev_net(dev);
3645         int run_pending = 0;
3646         int err;
3647
3648         switch (event) {
3649         case NETDEV_REGISTER:
3650                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3651                         idev = ipv6_add_dev(dev);
3652                         if (IS_ERR(idev))
3653                                 return notifier_from_errno(PTR_ERR(idev));
3654                 }
3655                 break;
3656
3657         case NETDEV_CHANGEMTU:
3658                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3659                 if (dev->mtu < IPV6_MIN_MTU) {
3660                         addrconf_ifdown(dev, dev != net->loopback_dev);
3661                         break;
3662                 }
3663
3664                 if (idev) {
3665                         rt6_mtu_change(dev, dev->mtu);
3666                         WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3667                         break;
3668                 }
3669
3670                 /* allocate new idev */
3671                 idev = ipv6_add_dev(dev);
3672                 if (IS_ERR(idev))
3673                         break;
3674
3675                 /* device is still not ready */
3676                 if (!(idev->if_flags & IF_READY))
3677                         break;
3678
3679                 run_pending = 1;
3680                 fallthrough;
3681         case NETDEV_UP:
3682         case NETDEV_CHANGE:
3683                 if (idev && idev->cnf.disable_ipv6)
3684                         break;
3685
3686                 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3687                         if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3688                             dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3689                                 ipv6_mc_up(idev);
3690                         break;
3691                 }
3692
3693                 if (event == NETDEV_UP) {
3694                         /* restore routes for permanent addresses */
3695                         addrconf_permanent_addr(net, dev);
3696
3697                         if (!addrconf_link_ready(dev)) {
3698                                 /* device is not ready yet. */
3699                                 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3700                                          dev->name);
3701                                 break;
3702                         }
3703
3704                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3705                                 idev = ipv6_add_dev(dev);
3706
3707                         if (!IS_ERR_OR_NULL(idev)) {
3708                                 idev->if_flags |= IF_READY;
3709                                 run_pending = 1;
3710                         }
3711                 } else if (event == NETDEV_CHANGE) {
3712                         if (!addrconf_link_ready(dev)) {
3713                                 /* device is still not ready. */
3714                                 rt6_sync_down_dev(dev, event);
3715                                 break;
3716                         }
3717
3718                         if (!IS_ERR_OR_NULL(idev)) {
3719                                 if (idev->if_flags & IF_READY) {
3720                                         /* device is already configured -
3721                                          * but resend MLD reports, we might
3722                                          * have roamed and need to update
3723                                          * multicast snooping switches
3724                                          */
3725                                         ipv6_mc_up(idev);
3726                                         change_info = ptr;
3727                                         if (change_info->flags_changed & IFF_NOARP)
3728                                                 addrconf_dad_run(idev, true);
3729                                         rt6_sync_up(dev, RTNH_F_LINKDOWN);
3730                                         break;
3731                                 }
3732                                 idev->if_flags |= IF_READY;
3733                         }
3734
3735                         pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3736                                  dev->name);
3737
3738                         run_pending = 1;
3739                 }
3740
3741                 addrconf_init_auto_addrs(dev);
3742
3743                 if (!IS_ERR_OR_NULL(idev)) {
3744                         if (run_pending)
3745                                 addrconf_dad_run(idev, false);
3746
3747                         /* Device has an address by now */
3748                         rt6_sync_up(dev, RTNH_F_DEAD);
3749
3750                         /*
3751                          * If the MTU changed during the interface down,
3752                          * when the interface up, the changed MTU must be
3753                          * reflected in the idev as well as routers.
3754                          */
3755                         if (idev->cnf.mtu6 != dev->mtu &&
3756                             dev->mtu >= IPV6_MIN_MTU) {
3757                                 rt6_mtu_change(dev, dev->mtu);
3758                                 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3759                         }
3760                         WRITE_ONCE(idev->tstamp, jiffies);
3761                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3762
3763                         /*
3764                          * If the changed mtu during down is lower than
3765                          * IPV6_MIN_MTU stop IPv6 on this interface.
3766                          */
3767                         if (dev->mtu < IPV6_MIN_MTU)
3768                                 addrconf_ifdown(dev, dev != net->loopback_dev);
3769                 }
3770                 break;
3771
3772         case NETDEV_DOWN:
3773         case NETDEV_UNREGISTER:
3774                 /*
3775                  *      Remove all addresses from this interface.
3776                  */
3777                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3778                 break;
3779
3780         case NETDEV_CHANGENAME:
3781                 if (idev) {
3782                         snmp6_unregister_dev(idev);
3783                         addrconf_sysctl_unregister(idev);
3784                         err = addrconf_sysctl_register(idev);
3785                         if (err)
3786                                 return notifier_from_errno(err);
3787                         err = snmp6_register_dev(idev);
3788                         if (err) {
3789                                 addrconf_sysctl_unregister(idev);
3790                                 return notifier_from_errno(err);
3791                         }
3792                 }
3793                 break;
3794
3795         case NETDEV_PRE_TYPE_CHANGE:
3796         case NETDEV_POST_TYPE_CHANGE:
3797                 if (idev)
3798                         addrconf_type_change(dev, event);
3799                 break;
3800
3801         case NETDEV_CHANGEUPPER:
3802                 info = ptr;
3803
3804                 /* flush all routes if dev is linked to or unlinked from
3805                  * an L3 master device (e.g., VRF)
3806                  */
3807                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3808                         addrconf_ifdown(dev, false);
3809         }
3810
3811         return NOTIFY_OK;
3812 }
3813
3814 /*
3815  *      addrconf module should be notified of a device going up
3816  */
3817 static struct notifier_block ipv6_dev_notf = {
3818         .notifier_call = addrconf_notify,
3819         .priority = ADDRCONF_NOTIFY_PRIORITY,
3820 };
3821
3822 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3823 {
3824         struct inet6_dev *idev;
3825         ASSERT_RTNL();
3826
3827         idev = __in6_dev_get(dev);
3828
3829         if (event == NETDEV_POST_TYPE_CHANGE)
3830                 ipv6_mc_remap(idev);
3831         else if (event == NETDEV_PRE_TYPE_CHANGE)
3832                 ipv6_mc_unmap(idev);
3833 }
3834
3835 static bool addr_is_local(const struct in6_addr *addr)
3836 {
3837         return ipv6_addr_type(addr) &
3838                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3839 }
3840
3841 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3842 {
3843         unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3844         struct net *net = dev_net(dev);
3845         struct inet6_dev *idev;
3846         struct inet6_ifaddr *ifa;
3847         LIST_HEAD(tmp_addr_list);
3848         bool keep_addr = false;
3849         bool was_ready;
3850         int state, i;
3851
3852         ASSERT_RTNL();
3853
3854         rt6_disable_ip(dev, event);
3855
3856         idev = __in6_dev_get(dev);
3857         if (!idev)
3858                 return -ENODEV;
3859
3860         /*
3861          * Step 1: remove reference to ipv6 device from parent device.
3862          *         Do not dev_put!
3863          */
3864         if (unregister) {
3865                 idev->dead = 1;
3866
3867                 /* protected by rtnl_lock */
3868                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3869
3870                 /* Step 1.5: remove snmp6 entry */
3871                 snmp6_unregister_dev(idev);
3872
3873         }
3874
3875         /* combine the user config with event to determine if permanent
3876          * addresses are to be removed from address hash table
3877          */
3878         if (!unregister && !idev->cnf.disable_ipv6) {
3879                 /* aggregate the system setting and interface setting */
3880                 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down);
3881
3882                 if (!_keep_addr)
3883                         _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down);
3884
3885                 keep_addr = (_keep_addr > 0);
3886         }
3887
3888         /* Step 2: clear hash table */
3889         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3890                 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3891
3892                 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3893 restart:
3894                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3895                         if (ifa->idev == idev) {
3896                                 addrconf_del_dad_work(ifa);
3897                                 /* combined flag + permanent flag decide if
3898                                  * address is retained on a down event
3899                                  */
3900                                 if (!keep_addr ||
3901                                     !(ifa->flags & IFA_F_PERMANENT) ||
3902                                     addr_is_local(&ifa->addr)) {
3903                                         hlist_del_init_rcu(&ifa->addr_lst);
3904                                         goto restart;
3905                                 }
3906                         }
3907                 }
3908                 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3909         }
3910
3911         write_lock_bh(&idev->lock);
3912
3913         addrconf_del_rs_timer(idev);
3914
3915         /* Step 2: clear flags for stateless addrconf, repeated down
3916          *         detection
3917          */
3918         was_ready = idev->if_flags & IF_READY;
3919         if (!unregister)
3920                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3921
3922         /* Step 3: clear tempaddr list */
3923         while (!list_empty(&idev->tempaddr_list)) {
3924                 ifa = list_first_entry(&idev->tempaddr_list,
3925                                        struct inet6_ifaddr, tmp_list);
3926                 list_del(&ifa->tmp_list);
3927                 write_unlock_bh(&idev->lock);
3928                 spin_lock_bh(&ifa->lock);
3929
3930                 if (ifa->ifpub) {
3931                         in6_ifa_put(ifa->ifpub);
3932                         ifa->ifpub = NULL;
3933                 }
3934                 spin_unlock_bh(&ifa->lock);
3935                 in6_ifa_put(ifa);
3936                 write_lock_bh(&idev->lock);
3937         }
3938
3939         list_for_each_entry(ifa, &idev->addr_list, if_list)
3940                 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3941         write_unlock_bh(&idev->lock);
3942
3943         while (!list_empty(&tmp_addr_list)) {
3944                 struct fib6_info *rt = NULL;
3945                 bool keep;
3946
3947                 ifa = list_first_entry(&tmp_addr_list,
3948                                        struct inet6_ifaddr, if_list_aux);
3949                 list_del(&ifa->if_list_aux);
3950
3951                 addrconf_del_dad_work(ifa);
3952
3953                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3954                         !addr_is_local(&ifa->addr);
3955
3956                 spin_lock_bh(&ifa->lock);
3957
3958                 if (keep) {
3959                         /* set state to skip the notifier below */
3960                         state = INET6_IFADDR_STATE_DEAD;
3961                         ifa->state = INET6_IFADDR_STATE_PREDAD;
3962                         if (!(ifa->flags & IFA_F_NODAD))
3963                                 ifa->flags |= IFA_F_TENTATIVE;
3964
3965                         rt = ifa->rt;
3966                         ifa->rt = NULL;
3967                 } else {
3968                         state = ifa->state;
3969                         ifa->state = INET6_IFADDR_STATE_DEAD;
3970                 }
3971
3972                 spin_unlock_bh(&ifa->lock);
3973
3974                 if (rt)
3975                         ip6_del_rt(net, rt, false);
3976
3977                 if (state != INET6_IFADDR_STATE_DEAD) {
3978                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3979                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3980                 } else {
3981                         if (idev->cnf.forwarding)
3982                                 addrconf_leave_anycast(ifa);
3983                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3984                 }
3985
3986                 if (!keep) {
3987                         write_lock_bh(&idev->lock);
3988                         list_del_rcu(&ifa->if_list);
3989                         write_unlock_bh(&idev->lock);
3990                         in6_ifa_put(ifa);
3991                 }
3992         }
3993
3994         /* Step 5: Discard anycast and multicast list */
3995         if (unregister) {
3996                 ipv6_ac_destroy_dev(idev);
3997                 ipv6_mc_destroy_dev(idev);
3998         } else if (was_ready) {
3999                 ipv6_mc_down(idev);
4000         }
4001
4002         WRITE_ONCE(idev->tstamp, jiffies);
4003         idev->ra_mtu = 0;
4004
4005         /* Last: Shot the device (if unregistered) */
4006         if (unregister) {
4007                 addrconf_sysctl_unregister(idev);
4008                 neigh_parms_release(&nd_tbl, idev->nd_parms);
4009                 neigh_ifdown(&nd_tbl, dev);
4010                 in6_dev_put(idev);
4011         }
4012         return 0;
4013 }
4014
4015 static void addrconf_rs_timer(struct timer_list *t)
4016 {
4017         struct inet6_dev *idev = from_timer(idev, t, rs_timer);
4018         struct net_device *dev = idev->dev;
4019         struct in6_addr lladdr;
4020         int rtr_solicits;
4021
4022         write_lock(&idev->lock);
4023         if (idev->dead || !(idev->if_flags & IF_READY))
4024                 goto out;
4025
4026         if (!ipv6_accept_ra(idev))
4027                 goto out;
4028
4029         /* Announcement received after solicitation was sent */
4030         if (idev->if_flags & IF_RA_RCVD)
4031                 goto out;
4032
4033         rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits);
4034
4035         if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) {
4036                 write_unlock(&idev->lock);
4037                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4038                         ndisc_send_rs(dev, &lladdr,
4039                                       &in6addr_linklocal_allrouters);
4040                 else
4041                         goto put;
4042
4043                 write_lock(&idev->lock);
4044                 idev->rs_interval = rfc3315_s14_backoff_update(
4045                                 idev->rs_interval,
4046                                 READ_ONCE(idev->cnf.rtr_solicit_max_interval));
4047                 /* The wait after the last probe can be shorter */
4048                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
4049                                              READ_ONCE(idev->cnf.rtr_solicits)) ?
4050                                       READ_ONCE(idev->cnf.rtr_solicit_delay) :
4051                                       idev->rs_interval);
4052         } else {
4053                 /*
4054                  * Note: we do not support deprecated "all on-link"
4055                  * assumption any longer.
4056                  */
4057                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4058         }
4059
4060 out:
4061         write_unlock(&idev->lock);
4062 put:
4063         in6_dev_put(idev);
4064 }
4065
4066 /*
4067  *      Duplicate Address Detection
4068  */
4069 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4070 {
4071         struct inet6_dev *idev = ifp->idev;
4072         unsigned long rand_num;
4073         u64 nonce;
4074
4075         if (ifp->flags & IFA_F_OPTIMISTIC)
4076                 rand_num = 0;
4077         else
4078                 rand_num = get_random_u32_below(
4079                                 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1);
4080
4081         nonce = 0;
4082         if (READ_ONCE(idev->cnf.enhanced_dad) ||
4083             READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) {
4084                 do
4085                         get_random_bytes(&nonce, 6);
4086                 while (nonce == 0);
4087         }
4088         ifp->dad_nonce = nonce;
4089         ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits);
4090         addrconf_mod_dad_work(ifp, rand_num);
4091 }
4092
4093 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4094 {
4095         struct inet6_dev *idev = ifp->idev;
4096         struct net_device *dev = idev->dev;
4097         bool bump_id, notify = false;
4098         struct net *net;
4099
4100         addrconf_join_solict(dev, &ifp->addr);
4101
4102         read_lock_bh(&idev->lock);
4103         spin_lock(&ifp->lock);
4104         if (ifp->state == INET6_IFADDR_STATE_DEAD)
4105                 goto out;
4106
4107         net = dev_net(dev);
4108         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4109             (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 &&
4110              READ_ONCE(idev->cnf.accept_dad) < 1) ||
4111             !(ifp->flags&IFA_F_TENTATIVE) ||
4112             ifp->flags & IFA_F_NODAD) {
4113                 bool send_na = false;
4114
4115                 if (ifp->flags & IFA_F_TENTATIVE &&
4116                     !(ifp->flags & IFA_F_OPTIMISTIC))
4117                         send_na = true;
4118                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4119                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4120                 spin_unlock(&ifp->lock);
4121                 read_unlock_bh(&idev->lock);
4122
4123                 addrconf_dad_completed(ifp, bump_id, send_na);
4124                 return;
4125         }
4126
4127         if (!(idev->if_flags & IF_READY)) {
4128                 spin_unlock(&ifp->lock);
4129                 read_unlock_bh(&idev->lock);
4130                 /*
4131                  * If the device is not ready:
4132                  * - keep it tentative if it is a permanent address.
4133                  * - otherwise, kill it.
4134                  */
4135                 in6_ifa_hold(ifp);
4136                 addrconf_dad_stop(ifp, 0);
4137                 return;
4138         }
4139
4140         /*
4141          * Optimistic nodes can start receiving
4142          * Frames right away
4143          */
4144         if (ifp->flags & IFA_F_OPTIMISTIC) {
4145                 ip6_ins_rt(net, ifp->rt);
4146                 if (ipv6_use_optimistic_addr(net, idev)) {
4147                         /* Because optimistic nodes can use this address,
4148                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
4149                          */
4150                         notify = true;
4151                 }
4152         }
4153
4154         addrconf_dad_kick(ifp);
4155 out:
4156         spin_unlock(&ifp->lock);
4157         read_unlock_bh(&idev->lock);
4158         if (notify)
4159                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4160 }
4161
4162 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4163 {
4164         bool begin_dad = false;
4165
4166         spin_lock_bh(&ifp->lock);
4167         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4168                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4169                 begin_dad = true;
4170         }
4171         spin_unlock_bh(&ifp->lock);
4172
4173         if (begin_dad)
4174                 addrconf_mod_dad_work(ifp, 0);
4175 }
4176
4177 static void addrconf_dad_work(struct work_struct *w)
4178 {
4179         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4180                                                 struct inet6_ifaddr,
4181                                                 dad_work);
4182         struct inet6_dev *idev = ifp->idev;
4183         bool bump_id, disable_ipv6 = false;
4184         struct in6_addr mcaddr;
4185
4186         enum {
4187                 DAD_PROCESS,
4188                 DAD_BEGIN,
4189                 DAD_ABORT,
4190         } action = DAD_PROCESS;
4191
4192         rtnl_lock();
4193
4194         spin_lock_bh(&ifp->lock);
4195         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4196                 action = DAD_BEGIN;
4197                 ifp->state = INET6_IFADDR_STATE_DAD;
4198         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4199                 action = DAD_ABORT;
4200                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4201
4202                 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 ||
4203                      READ_ONCE(idev->cnf.accept_dad) > 1) &&
4204                     !idev->cnf.disable_ipv6 &&
4205                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4206                         struct in6_addr addr;
4207
4208                         addr.s6_addr32[0] = htonl(0xfe800000);
4209                         addr.s6_addr32[1] = 0;
4210
4211                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4212                             ipv6_addr_equal(&ifp->addr, &addr)) {
4213                                 /* DAD failed for link-local based on MAC */
4214                                 WRITE_ONCE(idev->cnf.disable_ipv6, 1);
4215
4216                                 pr_info("%s: IPv6 being disabled!\n",
4217                                         ifp->idev->dev->name);
4218                                 disable_ipv6 = true;
4219                         }
4220                 }
4221         }
4222         spin_unlock_bh(&ifp->lock);
4223
4224         if (action == DAD_BEGIN) {
4225                 addrconf_dad_begin(ifp);
4226                 goto out;
4227         } else if (action == DAD_ABORT) {
4228                 in6_ifa_hold(ifp);
4229                 addrconf_dad_stop(ifp, 1);
4230                 if (disable_ipv6)
4231                         addrconf_ifdown(idev->dev, false);
4232                 goto out;
4233         }
4234
4235         if (!ifp->dad_probes && addrconf_dad_end(ifp))
4236                 goto out;
4237
4238         write_lock_bh(&idev->lock);
4239         if (idev->dead || !(idev->if_flags & IF_READY)) {
4240                 write_unlock_bh(&idev->lock);
4241                 goto out;
4242         }
4243
4244         spin_lock(&ifp->lock);
4245         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4246                 spin_unlock(&ifp->lock);
4247                 write_unlock_bh(&idev->lock);
4248                 goto out;
4249         }
4250
4251         if (ifp->dad_probes == 0) {
4252                 bool send_na = false;
4253
4254                 /*
4255                  * DAD was successful
4256                  */
4257
4258                 if (ifp->flags & IFA_F_TENTATIVE &&
4259                     !(ifp->flags & IFA_F_OPTIMISTIC))
4260                         send_na = true;
4261                 bump_id = ifp->flags & IFA_F_TENTATIVE;
4262                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4263                 spin_unlock(&ifp->lock);
4264                 write_unlock_bh(&idev->lock);
4265
4266                 addrconf_dad_completed(ifp, bump_id, send_na);
4267
4268                 goto out;
4269         }
4270
4271         ifp->dad_probes--;
4272         addrconf_mod_dad_work(ifp,
4273                               max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4274                                   HZ/100));
4275         spin_unlock(&ifp->lock);
4276         write_unlock_bh(&idev->lock);
4277
4278         /* send a neighbour solicitation for our addr */
4279         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4280         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4281                       ifp->dad_nonce);
4282 out:
4283         in6_ifa_put(ifp);
4284         rtnl_unlock();
4285 }
4286
4287 /* ifp->idev must be at least read locked */
4288 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4289 {
4290         struct inet6_ifaddr *ifpiter;
4291         struct inet6_dev *idev = ifp->idev;
4292
4293         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4294                 if (ifpiter->scope > IFA_LINK)
4295                         break;
4296                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4297                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4298                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4299                     IFA_F_PERMANENT)
4300                         return false;
4301         }
4302         return true;
4303 }
4304
4305 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4306                                    bool send_na)
4307 {
4308         struct net_device *dev = ifp->idev->dev;
4309         struct in6_addr lladdr;
4310         bool send_rs, send_mld;
4311
4312         addrconf_del_dad_work(ifp);
4313
4314         /*
4315          *      Configure the address for reception. Now it is valid.
4316          */
4317
4318         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4319
4320         /* If added prefix is link local and we are prepared to process
4321            router advertisements, start sending router solicitations.
4322          */
4323
4324         read_lock_bh(&ifp->idev->lock);
4325         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4326         send_rs = send_mld &&
4327                   ipv6_accept_ra(ifp->idev) &&
4328                   READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 &&
4329                   (dev->flags & IFF_LOOPBACK) == 0 &&
4330                   (dev->type != ARPHRD_TUNNEL) &&
4331                   !netif_is_team_port(dev);
4332         read_unlock_bh(&ifp->idev->lock);
4333
4334         /* While dad is in progress mld report's source address is in6_addrany.
4335          * Resend with proper ll now.
4336          */
4337         if (send_mld)
4338                 ipv6_mc_dad_complete(ifp->idev);
4339
4340         /* send unsolicited NA if enabled */
4341         if (send_na &&
4342             (READ_ONCE(ifp->idev->cnf.ndisc_notify) ||
4343              READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) {
4344                 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4345                               /*router=*/ !!ifp->idev->cnf.forwarding,
4346                               /*solicited=*/ false, /*override=*/ true,
4347                               /*inc_opt=*/ true);
4348         }
4349
4350         if (send_rs) {
4351                 /*
4352                  *      If a host as already performed a random delay
4353                  *      [...] as part of DAD [...] there is no need
4354                  *      to delay again before sending the first RS
4355                  */
4356                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4357                         return;
4358                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4359
4360                 write_lock_bh(&ifp->idev->lock);
4361                 spin_lock(&ifp->lock);
4362                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4363                         READ_ONCE(ifp->idev->cnf.rtr_solicit_interval));
4364                 ifp->idev->rs_probes = 1;
4365                 ifp->idev->if_flags |= IF_RS_SENT;
4366                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4367                 spin_unlock(&ifp->lock);
4368                 write_unlock_bh(&ifp->idev->lock);
4369         }
4370
4371         if (bump_id)
4372                 rt_genid_bump_ipv6(dev_net(dev));
4373
4374         /* Make sure that a new temporary address will be created
4375          * before this temporary address becomes deprecated.
4376          */
4377         if (ifp->flags & IFA_F_TEMPORARY)
4378                 addrconf_verify_rtnl(dev_net(dev));
4379 }
4380
4381 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4382 {
4383         struct inet6_ifaddr *ifp;
4384
4385         read_lock_bh(&idev->lock);
4386         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4387                 spin_lock(&ifp->lock);
4388                 if ((ifp->flags & IFA_F_TENTATIVE &&
4389                      ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4390                         if (restart)
4391                                 ifp->state = INET6_IFADDR_STATE_PREDAD;
4392                         addrconf_dad_kick(ifp);
4393                 }
4394                 spin_unlock(&ifp->lock);
4395         }
4396         read_unlock_bh(&idev->lock);
4397 }
4398
4399 #ifdef CONFIG_PROC_FS
4400 struct if6_iter_state {
4401         struct seq_net_private p;
4402         int bucket;
4403         int offset;
4404 };
4405
4406 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4407 {
4408         struct if6_iter_state *state = seq->private;
4409         struct net *net = seq_file_net(seq);
4410         struct inet6_ifaddr *ifa = NULL;
4411         int p = 0;
4412
4413         /* initial bucket if pos is 0 */
4414         if (pos == 0) {
4415                 state->bucket = 0;
4416                 state->offset = 0;
4417         }
4418
4419         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4420                 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4421                                          addr_lst) {
4422                         /* sync with offset */
4423                         if (p < state->offset) {
4424                                 p++;
4425                                 continue;
4426                         }
4427                         return ifa;
4428                 }
4429
4430                 /* prepare for next bucket */
4431                 state->offset = 0;
4432                 p = 0;
4433         }
4434         return NULL;
4435 }
4436
4437 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4438                                          struct inet6_ifaddr *ifa)
4439 {
4440         struct if6_iter_state *state = seq->private;
4441         struct net *net = seq_file_net(seq);
4442
4443         hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4444                 state->offset++;
4445                 return ifa;
4446         }
4447
4448         state->offset = 0;
4449         while (++state->bucket < IN6_ADDR_HSIZE) {
4450                 hlist_for_each_entry_rcu(ifa,
4451                                      &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4452                         return ifa;
4453                 }
4454         }
4455
4456         return NULL;
4457 }
4458
4459 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4460         __acquires(rcu)
4461 {
4462         rcu_read_lock();
4463         return if6_get_first(seq, *pos);
4464 }
4465
4466 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4467 {
4468         struct inet6_ifaddr *ifa;
4469
4470         ifa = if6_get_next(seq, v);
4471         ++*pos;
4472         return ifa;
4473 }
4474
4475 static void if6_seq_stop(struct seq_file *seq, void *v)
4476         __releases(rcu)
4477 {
4478         rcu_read_unlock();
4479 }
4480
4481 static int if6_seq_show(struct seq_file *seq, void *v)
4482 {
4483         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4484         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4485                    &ifp->addr,
4486                    ifp->idev->dev->ifindex,
4487                    ifp->prefix_len,
4488                    ifp->scope,
4489                    (u8) ifp->flags,
4490                    ifp->idev->dev->name);
4491         return 0;
4492 }
4493
4494 static const struct seq_operations if6_seq_ops = {
4495         .start  = if6_seq_start,
4496         .next   = if6_seq_next,
4497         .show   = if6_seq_show,
4498         .stop   = if6_seq_stop,
4499 };
4500
4501 static int __net_init if6_proc_net_init(struct net *net)
4502 {
4503         if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4504                         sizeof(struct if6_iter_state)))
4505                 return -ENOMEM;
4506         return 0;
4507 }
4508
4509 static void __net_exit if6_proc_net_exit(struct net *net)
4510 {
4511         remove_proc_entry("if_inet6", net->proc_net);
4512 }
4513
4514 static struct pernet_operations if6_proc_net_ops = {
4515         .init = if6_proc_net_init,
4516         .exit = if6_proc_net_exit,
4517 };
4518
4519 int __init if6_proc_init(void)
4520 {
4521         return register_pernet_subsys(&if6_proc_net_ops);
4522 }
4523
4524 void if6_proc_exit(void)
4525 {
4526         unregister_pernet_subsys(&if6_proc_net_ops);
4527 }
4528 #endif  /* CONFIG_PROC_FS */
4529
4530 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4531 /* Check if address is a home address configured on any interface. */
4532 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4533 {
4534         unsigned int hash = inet6_addr_hash(net, addr);
4535         struct inet6_ifaddr *ifp = NULL;
4536         int ret = 0;
4537
4538         rcu_read_lock();
4539         hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4540                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4541                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4542                         ret = 1;
4543                         break;
4544                 }
4545         }
4546         rcu_read_unlock();
4547         return ret;
4548 }
4549 #endif
4550
4551 /* RFC6554 has some algorithm to avoid loops in segment routing by
4552  * checking if the segments contains any of a local interface address.
4553  *
4554  * Quote:
4555  *
4556  * To detect loops in the SRH, a router MUST determine if the SRH
4557  * includes multiple addresses assigned to any interface on that router.
4558  * If such addresses appear more than once and are separated by at least
4559  * one address not assigned to that router.
4560  */
4561 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4562                           unsigned char nsegs)
4563 {
4564         const struct in6_addr *addr;
4565         int i, ret = 0, found = 0;
4566         struct inet6_ifaddr *ifp;
4567         bool separated = false;
4568         unsigned int hash;
4569         bool hash_found;
4570
4571         rcu_read_lock();
4572         for (i = 0; i < nsegs; i++) {
4573                 addr = &segs[i];
4574                 hash = inet6_addr_hash(net, addr);
4575
4576                 hash_found = false;
4577                 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4578
4579                         if (ipv6_addr_equal(&ifp->addr, addr)) {
4580                                 hash_found = true;
4581                                 break;
4582                         }
4583                 }
4584
4585                 if (hash_found) {
4586                         if (found > 1 && separated) {
4587                                 ret = 1;
4588                                 break;
4589                         }
4590
4591                         separated = false;
4592                         found++;
4593                 } else {
4594                         separated = true;
4595                 }
4596         }
4597         rcu_read_unlock();
4598
4599         return ret;
4600 }
4601
4602 /*
4603  *      Periodic address status verification
4604  */
4605
4606 static void addrconf_verify_rtnl(struct net *net)
4607 {
4608         unsigned long now, next, next_sec, next_sched;
4609         struct inet6_ifaddr *ifp;
4610         int i;
4611
4612         ASSERT_RTNL();
4613
4614         rcu_read_lock_bh();
4615         now = jiffies;
4616         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4617
4618         cancel_delayed_work(&net->ipv6.addr_chk_work);
4619
4620         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4621 restart:
4622                 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4623                         unsigned long age;
4624
4625                         /* When setting preferred_lft to a value not zero or
4626                          * infinity, while valid_lft is infinity
4627                          * IFA_F_PERMANENT has a non-infinity life time.
4628                          */
4629                         if ((ifp->flags & IFA_F_PERMANENT) &&
4630                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4631                                 continue;
4632
4633                         spin_lock(&ifp->lock);
4634                         /* We try to batch several events at once. */
4635                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4636
4637                         if ((ifp->flags&IFA_F_TEMPORARY) &&
4638                             !(ifp->flags&IFA_F_TENTATIVE) &&
4639                             ifp->prefered_lft != INFINITY_LIFE_TIME &&
4640                             !ifp->regen_count && ifp->ifpub) {
4641                                 /* This is a non-regenerated temporary addr. */
4642
4643                                 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev);
4644
4645                                 if (age + regen_advance >= ifp->prefered_lft) {
4646                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4647                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4648                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4649
4650                                         ifp->regen_count++;
4651                                         in6_ifa_hold(ifp);
4652                                         in6_ifa_hold(ifpub);
4653                                         spin_unlock(&ifp->lock);
4654
4655                                         spin_lock(&ifpub->lock);
4656                                         ifpub->regen_count = 0;
4657                                         spin_unlock(&ifpub->lock);
4658                                         rcu_read_unlock_bh();
4659                                         ipv6_create_tempaddr(ifpub, true);
4660                                         in6_ifa_put(ifpub);
4661                                         in6_ifa_put(ifp);
4662                                         rcu_read_lock_bh();
4663                                         goto restart;
4664                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4665                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4666                         }
4667
4668                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4669                             age >= ifp->valid_lft) {
4670                                 spin_unlock(&ifp->lock);
4671                                 in6_ifa_hold(ifp);
4672                                 rcu_read_unlock_bh();
4673                                 ipv6_del_addr(ifp);
4674                                 rcu_read_lock_bh();
4675                                 goto restart;
4676                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4677                                 spin_unlock(&ifp->lock);
4678                                 continue;
4679                         } else if (age >= ifp->prefered_lft) {
4680                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4681                                 int deprecate = 0;
4682
4683                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4684                                         deprecate = 1;
4685                                         ifp->flags |= IFA_F_DEPRECATED;
4686                                 }
4687
4688                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4689                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4690                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4691
4692                                 spin_unlock(&ifp->lock);
4693
4694                                 if (deprecate) {
4695                                         in6_ifa_hold(ifp);
4696
4697                                         ipv6_ifa_notify(0, ifp);
4698                                         in6_ifa_put(ifp);
4699                                         goto restart;
4700                                 }
4701                         } else {
4702                                 /* ifp->prefered_lft <= ifp->valid_lft */
4703                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4704                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4705                                 spin_unlock(&ifp->lock);
4706                         }
4707                 }
4708         }
4709
4710         next_sec = round_jiffies_up(next);
4711         next_sched = next;
4712
4713         /* If rounded timeout is accurate enough, accept it. */
4714         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4715                 next_sched = next_sec;
4716
4717         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4718         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4719                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4720
4721         pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4722                  now, next, next_sec, next_sched);
4723         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4724         rcu_read_unlock_bh();
4725 }
4726
4727 static void addrconf_verify_work(struct work_struct *w)
4728 {
4729         struct net *net = container_of(to_delayed_work(w), struct net,
4730                                        ipv6.addr_chk_work);
4731
4732         rtnl_lock();
4733         addrconf_verify_rtnl(net);
4734         rtnl_unlock();
4735 }
4736
4737 static void addrconf_verify(struct net *net)
4738 {
4739         mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4740 }
4741
4742 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4743                                      struct in6_addr **peer_pfx)
4744 {
4745         struct in6_addr *pfx = NULL;
4746
4747         *peer_pfx = NULL;
4748
4749         if (addr)
4750                 pfx = nla_data(addr);
4751
4752         if (local) {
4753                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4754                         *peer_pfx = pfx;
4755                 pfx = nla_data(local);
4756         }
4757
4758         return pfx;
4759 }
4760
4761 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4762         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4763         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4764         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4765         [IFA_FLAGS]             = { .len = sizeof(u32) },
4766         [IFA_RT_PRIORITY]       = { .len = sizeof(u32) },
4767         [IFA_TARGET_NETNSID]    = { .type = NLA_S32 },
4768         [IFA_PROTO]             = { .type = NLA_U8 },
4769 };
4770
4771 static int
4772 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4773                   struct netlink_ext_ack *extack)
4774 {
4775         struct net *net = sock_net(skb->sk);
4776         struct ifaddrmsg *ifm;
4777         struct nlattr *tb[IFA_MAX+1];
4778         struct in6_addr *pfx, *peer_pfx;
4779         u32 ifa_flags;
4780         int err;
4781
4782         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4783                                      ifa_ipv6_policy, extack);
4784         if (err < 0)
4785                 return err;
4786
4787         ifm = nlmsg_data(nlh);
4788         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4789         if (!pfx)
4790                 return -EINVAL;
4791
4792         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4793
4794         /* We ignore other flags so far. */
4795         ifa_flags &= IFA_F_MANAGETEMPADDR;
4796
4797         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4798                               ifm->ifa_prefixlen, extack);
4799 }
4800
4801 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4802                                unsigned long expires, u32 flags,
4803                                bool modify_peer)
4804 {
4805         struct fib6_table *table;
4806         struct fib6_info *f6i;
4807         u32 prio;
4808
4809         f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4810                                         ifp->prefix_len,
4811                                         ifp->idev->dev, 0, RTF_DEFAULT, true);
4812         if (!f6i)
4813                 return -ENOENT;
4814
4815         prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4816         if (f6i->fib6_metric != prio) {
4817                 /* delete old one */
4818                 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4819
4820                 /* add new one */
4821                 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4822                                       ifp->prefix_len,
4823                                       ifp->rt_priority, ifp->idev->dev,
4824                                       expires, flags, GFP_KERNEL);
4825         } else {
4826                 table = f6i->fib6_table;
4827                 spin_lock_bh(&table->tb6_lock);
4828
4829                 if (!(flags & RTF_EXPIRES)) {
4830                         fib6_clean_expires(f6i);
4831                         fib6_remove_gc_list(f6i);
4832                 } else {
4833                         fib6_set_expires(f6i, expires);
4834                         fib6_add_gc_list(f6i);
4835                 }
4836
4837                 spin_unlock_bh(&table->tb6_lock);
4838
4839                 fib6_info_release(f6i);
4840         }
4841
4842         return 0;
4843 }
4844
4845 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4846                              struct ifa6_config *cfg)
4847 {
4848         u32 flags;
4849         clock_t expires;
4850         unsigned long timeout;
4851         bool was_managetempaddr;
4852         bool had_prefixroute;
4853         bool new_peer = false;
4854
4855         ASSERT_RTNL();
4856
4857         if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4858                 return -EINVAL;
4859
4860         if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4861             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4862                 return -EINVAL;
4863
4864         if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4865                 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4866
4867         timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4868         if (addrconf_finite_timeout(timeout)) {
4869                 expires = jiffies_to_clock_t(timeout * HZ);
4870                 cfg->valid_lft = timeout;
4871                 flags = RTF_EXPIRES;
4872         } else {
4873                 expires = 0;
4874                 flags = 0;
4875                 cfg->ifa_flags |= IFA_F_PERMANENT;
4876         }
4877
4878         timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4879         if (addrconf_finite_timeout(timeout)) {
4880                 if (timeout == 0)
4881                         cfg->ifa_flags |= IFA_F_DEPRECATED;
4882                 cfg->preferred_lft = timeout;
4883         }
4884
4885         if (cfg->peer_pfx &&
4886             memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4887                 if (!ipv6_addr_any(&ifp->peer_addr))
4888                         cleanup_prefix_route(ifp, expires, true, true);
4889                 new_peer = true;
4890         }
4891
4892         spin_lock_bh(&ifp->lock);
4893         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4894         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4895                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4896         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4897                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4898                         IFA_F_NOPREFIXROUTE);
4899         ifp->flags |= cfg->ifa_flags;
4900         WRITE_ONCE(ifp->tstamp, jiffies);
4901         WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
4902         WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
4903         WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
4904
4905         if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4906                 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
4907
4908         if (new_peer)
4909                 ifp->peer_addr = *cfg->peer_pfx;
4910
4911         spin_unlock_bh(&ifp->lock);
4912         if (!(ifp->flags&IFA_F_TENTATIVE))
4913                 ipv6_ifa_notify(0, ifp);
4914
4915         if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4916                 int rc = -ENOENT;
4917
4918                 if (had_prefixroute)
4919                         rc = modify_prefix_route(ifp, expires, flags, false);
4920
4921                 /* prefix route could have been deleted; if so restore it */
4922                 if (rc == -ENOENT) {
4923                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4924                                               ifp->rt_priority, ifp->idev->dev,
4925                                               expires, flags, GFP_KERNEL);
4926                 }
4927
4928                 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4929                         rc = modify_prefix_route(ifp, expires, flags, true);
4930
4931                 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4932                         addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4933                                               ifp->rt_priority, ifp->idev->dev,
4934                                               expires, flags, GFP_KERNEL);
4935                 }
4936         } else if (had_prefixroute) {
4937                 enum cleanup_prefix_rt_t action;
4938                 unsigned long rt_expires;
4939
4940                 write_lock_bh(&ifp->idev->lock);
4941                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4942                 write_unlock_bh(&ifp->idev->lock);
4943
4944                 if (action != CLEANUP_PREFIX_RT_NOP) {
4945                         cleanup_prefix_route(ifp, rt_expires,
4946                                 action == CLEANUP_PREFIX_RT_DEL, false);
4947                 }
4948         }
4949
4950         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4951                 if (was_managetempaddr &&
4952                     !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4953                         cfg->valid_lft = 0;
4954                         cfg->preferred_lft = 0;
4955                 }
4956                 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4957                                  cfg->preferred_lft, !was_managetempaddr,
4958                                  jiffies);
4959         }
4960
4961         addrconf_verify_rtnl(net);
4962
4963         return 0;
4964 }
4965
4966 static int
4967 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4968                   struct netlink_ext_ack *extack)
4969 {
4970         struct net *net = sock_net(skb->sk);
4971         struct ifaddrmsg *ifm;
4972         struct nlattr *tb[IFA_MAX+1];
4973         struct in6_addr *peer_pfx;
4974         struct inet6_ifaddr *ifa;
4975         struct net_device *dev;
4976         struct inet6_dev *idev;
4977         struct ifa6_config cfg;
4978         int err;
4979
4980         err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4981                                      ifa_ipv6_policy, extack);
4982         if (err < 0)
4983                 return err;
4984
4985         memset(&cfg, 0, sizeof(cfg));
4986
4987         ifm = nlmsg_data(nlh);
4988         cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4989         if (!cfg.pfx)
4990                 return -EINVAL;
4991
4992         cfg.peer_pfx = peer_pfx;
4993         cfg.plen = ifm->ifa_prefixlen;
4994         if (tb[IFA_RT_PRIORITY])
4995                 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4996
4997         if (tb[IFA_PROTO])
4998                 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4999
5000         cfg.valid_lft = INFINITY_LIFE_TIME;
5001         cfg.preferred_lft = INFINITY_LIFE_TIME;
5002
5003         if (tb[IFA_CACHEINFO]) {
5004                 struct ifa_cacheinfo *ci;
5005
5006                 ci = nla_data(tb[IFA_CACHEINFO]);
5007                 cfg.valid_lft = ci->ifa_valid;
5008                 cfg.preferred_lft = ci->ifa_prefered;
5009         }
5010
5011         dev =  __dev_get_by_index(net, ifm->ifa_index);
5012         if (!dev) {
5013                 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
5014                 return -ENODEV;
5015         }
5016
5017         if (tb[IFA_FLAGS])
5018                 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
5019         else
5020                 cfg.ifa_flags = ifm->ifa_flags;
5021
5022         /* We ignore other flags so far. */
5023         cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
5024                          IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
5025                          IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
5026
5027         idev = ipv6_find_idev(dev);
5028         if (IS_ERR(idev))
5029                 return PTR_ERR(idev);
5030
5031         if (!ipv6_allow_optimistic_dad(net, idev))
5032                 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
5033
5034         if (cfg.ifa_flags & IFA_F_NODAD &&
5035             cfg.ifa_flags & IFA_F_OPTIMISTIC) {
5036                 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
5037                 return -EINVAL;
5038         }
5039
5040         ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
5041         if (!ifa) {
5042                 /*
5043                  * It would be best to check for !NLM_F_CREATE here but
5044                  * userspace already relies on not having to provide this.
5045                  */
5046                 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
5047         }
5048
5049         if (nlh->nlmsg_flags & NLM_F_EXCL ||
5050             !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5051                 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5052                 err = -EEXIST;
5053         } else {
5054                 err = inet6_addr_modify(net, ifa, &cfg);
5055         }
5056
5057         in6_ifa_put(ifa);
5058
5059         return err;
5060 }
5061
5062 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5063                           u8 scope, int ifindex)
5064 {
5065         struct ifaddrmsg *ifm;
5066
5067         ifm = nlmsg_data(nlh);
5068         ifm->ifa_family = AF_INET6;
5069         ifm->ifa_prefixlen = prefixlen;
5070         ifm->ifa_flags = flags;
5071         ifm->ifa_scope = scope;
5072         ifm->ifa_index = ifindex;
5073 }
5074
5075 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5076                          unsigned long tstamp, u32 preferred, u32 valid)
5077 {
5078         struct ifa_cacheinfo ci;
5079
5080         ci.cstamp = cstamp_delta(cstamp);
5081         ci.tstamp = cstamp_delta(tstamp);
5082         ci.ifa_prefered = preferred;
5083         ci.ifa_valid = valid;
5084
5085         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5086 }
5087
5088 static inline int rt_scope(int ifa_scope)
5089 {
5090         if (ifa_scope & IFA_HOST)
5091                 return RT_SCOPE_HOST;
5092         else if (ifa_scope & IFA_LINK)
5093                 return RT_SCOPE_LINK;
5094         else if (ifa_scope & IFA_SITE)
5095                 return RT_SCOPE_SITE;
5096         else
5097                 return RT_SCOPE_UNIVERSE;
5098 }
5099
5100 static inline int inet6_ifaddr_msgsize(void)
5101 {
5102         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5103                + nla_total_size(16) /* IFA_LOCAL */
5104                + nla_total_size(16) /* IFA_ADDRESS */
5105                + nla_total_size(sizeof(struct ifa_cacheinfo))
5106                + nla_total_size(4)  /* IFA_FLAGS */
5107                + nla_total_size(1)  /* IFA_PROTO */
5108                + nla_total_size(4)  /* IFA_RT_PRIORITY */;
5109 }
5110
5111 enum addr_type_t {
5112         UNICAST_ADDR,
5113         MULTICAST_ADDR,
5114         ANYCAST_ADDR,
5115 };
5116
5117 struct inet6_fill_args {
5118         u32 portid;
5119         u32 seq;
5120         int event;
5121         unsigned int flags;
5122         int netnsid;
5123         int ifindex;
5124         enum addr_type_t type;
5125 };
5126
5127 static int inet6_fill_ifaddr(struct sk_buff *skb,
5128                              const struct inet6_ifaddr *ifa,
5129                              struct inet6_fill_args *args)
5130 {
5131         struct nlmsghdr *nlh;
5132         u32 preferred, valid;
5133         u32 flags, priority;
5134         u8 proto;
5135
5136         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5137                         sizeof(struct ifaddrmsg), args->flags);
5138         if (!nlh)
5139                 return -EMSGSIZE;
5140
5141         flags = READ_ONCE(ifa->flags);
5142         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5143                       ifa->idev->dev->ifindex);
5144
5145         if (args->netnsid >= 0 &&
5146             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5147                 goto error;
5148
5149         preferred = READ_ONCE(ifa->prefered_lft);
5150         valid = READ_ONCE(ifa->valid_lft);
5151
5152         if (!((flags & IFA_F_PERMANENT) &&
5153               (preferred == INFINITY_LIFE_TIME))) {
5154                 if (preferred != INFINITY_LIFE_TIME) {
5155                         long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
5156
5157                         if (preferred > tval)
5158                                 preferred -= tval;
5159                         else
5160                                 preferred = 0;
5161                         if (valid != INFINITY_LIFE_TIME) {
5162                                 if (valid > tval)
5163                                         valid -= tval;
5164                                 else
5165                                         valid = 0;
5166                         }
5167                 }
5168         } else {
5169                 preferred = INFINITY_LIFE_TIME;
5170                 valid = INFINITY_LIFE_TIME;
5171         }
5172
5173         if (!ipv6_addr_any(&ifa->peer_addr)) {
5174                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5175                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5176                         goto error;
5177         } else {
5178                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5179                         goto error;
5180         }
5181
5182         priority = READ_ONCE(ifa->rt_priority);
5183         if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
5184                 goto error;
5185
5186         if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
5187                           preferred, valid) < 0)
5188                 goto error;
5189
5190         if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
5191                 goto error;
5192
5193         proto = READ_ONCE(ifa->ifa_proto);
5194         if (proto && nla_put_u8(skb, IFA_PROTO, proto))
5195                 goto error;
5196
5197         nlmsg_end(skb, nlh);
5198         return 0;
5199
5200 error:
5201         nlmsg_cancel(skb, nlh);
5202         return -EMSGSIZE;
5203 }
5204
5205 static int inet6_fill_ifmcaddr(struct sk_buff *skb,
5206                                const struct ifmcaddr6 *ifmca,
5207                                struct inet6_fill_args *args)
5208 {
5209         int ifindex = ifmca->idev->dev->ifindex;
5210         u8 scope = RT_SCOPE_UNIVERSE;
5211         struct nlmsghdr *nlh;
5212
5213         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5214                 scope = RT_SCOPE_SITE;
5215
5216         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5217                         sizeof(struct ifaddrmsg), args->flags);
5218         if (!nlh)
5219                 return -EMSGSIZE;
5220
5221         if (args->netnsid >= 0 &&
5222             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5223                 nlmsg_cancel(skb, nlh);
5224                 return -EMSGSIZE;
5225         }
5226
5227         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5228         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5229             put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
5230                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5231                 nlmsg_cancel(skb, nlh);
5232                 return -EMSGSIZE;
5233         }
5234
5235         nlmsg_end(skb, nlh);
5236         return 0;
5237 }
5238
5239 static int inet6_fill_ifacaddr(struct sk_buff *skb,
5240                                const struct ifacaddr6 *ifaca,
5241                                struct inet6_fill_args *args)
5242 {
5243         struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5244         int ifindex = dev ? dev->ifindex : 1;
5245         u8 scope = RT_SCOPE_UNIVERSE;
5246         struct nlmsghdr *nlh;
5247
5248         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5249                 scope = RT_SCOPE_SITE;
5250
5251         nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5252                         sizeof(struct ifaddrmsg), args->flags);
5253         if (!nlh)
5254                 return -EMSGSIZE;
5255
5256         if (args->netnsid >= 0 &&
5257             nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5258                 nlmsg_cancel(skb, nlh);
5259                 return -EMSGSIZE;
5260         }
5261
5262         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5263         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5264             put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
5265                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5266                 nlmsg_cancel(skb, nlh);
5267                 return -EMSGSIZE;
5268         }
5269
5270         nlmsg_end(skb, nlh);
5271         return 0;
5272 }
5273
5274 /* called with rcu_read_lock() */
5275 static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
5276                           struct netlink_callback *cb, int *s_ip_idx,
5277                           struct inet6_fill_args *fillargs)
5278 {
5279         const struct ifmcaddr6 *ifmca;
5280         const struct ifacaddr6 *ifaca;
5281         int ip_idx = 0;
5282         int err = 0;
5283
5284         switch (fillargs->type) {
5285         case UNICAST_ADDR: {
5286                 const struct inet6_ifaddr *ifa;
5287                 fillargs->event = RTM_NEWADDR;
5288
5289                 /* unicast address incl. temp addr */
5290                 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
5291                         if (ip_idx < *s_ip_idx)
5292                                 goto next;
5293                         err = inet6_fill_ifaddr(skb, ifa, fillargs);
5294                         if (err < 0)
5295                                 break;
5296                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5297 next:
5298                         ip_idx++;
5299                 }
5300                 break;
5301         }
5302         case MULTICAST_ADDR:
5303                 fillargs->event = RTM_GETMULTICAST;
5304
5305                 /* multicast address */
5306                 for (ifmca = rcu_dereference(idev->mc_list);
5307                      ifmca;
5308                      ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5309                         if (ip_idx < *s_ip_idx)
5310                                 continue;
5311                         err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5312                         if (err < 0)
5313                                 break;
5314                 }
5315                 break;
5316         case ANYCAST_ADDR:
5317                 fillargs->event = RTM_GETANYCAST;
5318                 /* anycast address */
5319                 for (ifaca = rcu_dereference(idev->ac_list); ifaca;
5320                      ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
5321                         if (ip_idx < *s_ip_idx)
5322                                 continue;
5323                         err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5324                         if (err < 0)
5325                                 break;
5326                 }
5327                 break;
5328         default:
5329                 break;
5330         }
5331         *s_ip_idx = err ? ip_idx : 0;
5332         return err;
5333 }
5334
5335 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5336                                        struct inet6_fill_args *fillargs,
5337                                        struct net **tgt_net, struct sock *sk,
5338                                        struct netlink_callback *cb)
5339 {
5340         struct netlink_ext_ack *extack = cb->extack;
5341         struct nlattr *tb[IFA_MAX+1];
5342         struct ifaddrmsg *ifm;
5343         int err, i;
5344
5345         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5346                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5347                 return -EINVAL;
5348         }
5349
5350         ifm = nlmsg_data(nlh);
5351         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5352                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5353                 return -EINVAL;
5354         }
5355
5356         fillargs->ifindex = ifm->ifa_index;
5357         if (fillargs->ifindex) {
5358                 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5359                 fillargs->flags |= NLM_F_DUMP_FILTERED;
5360         }
5361
5362         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5363                                             ifa_ipv6_policy, extack);
5364         if (err < 0)
5365                 return err;
5366
5367         for (i = 0; i <= IFA_MAX; ++i) {
5368                 if (!tb[i])
5369                         continue;
5370
5371                 if (i == IFA_TARGET_NETNSID) {
5372                         struct net *net;
5373
5374                         fillargs->netnsid = nla_get_s32(tb[i]);
5375                         net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5376                         if (IS_ERR(net)) {
5377                                 fillargs->netnsid = -1;
5378                                 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5379                                 return PTR_ERR(net);
5380                         }
5381                         *tgt_net = net;
5382                 } else {
5383                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5384                         return -EINVAL;
5385                 }
5386         }
5387
5388         return 0;
5389 }
5390
5391 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5392                            enum addr_type_t type)
5393 {
5394         struct net *tgt_net = sock_net(skb->sk);
5395         const struct nlmsghdr *nlh = cb->nlh;
5396         struct inet6_fill_args fillargs = {
5397                 .portid = NETLINK_CB(cb->skb).portid,
5398                 .seq = cb->nlh->nlmsg_seq,
5399                 .flags = NLM_F_MULTI,
5400                 .netnsid = -1,
5401                 .type = type,
5402         };
5403         struct {
5404                 unsigned long ifindex;
5405                 int ip_idx;
5406         } *ctx = (void *)cb->ctx;
5407         struct net_device *dev;
5408         struct inet6_dev *idev;
5409         int err = 0;
5410
5411         rcu_read_lock();
5412         if (cb->strict_check) {
5413                 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5414                                                   skb->sk, cb);
5415                 if (err < 0)
5416                         goto done;
5417
5418                 err = 0;
5419                 if (fillargs.ifindex) {
5420                         dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
5421                         if (!dev) {
5422                                 err = -ENODEV;
5423                                 goto done;
5424                         }
5425                         idev = __in6_dev_get(dev);
5426                         if (idev)
5427                                 err = in6_dump_addrs(idev, skb, cb,
5428                                                      &ctx->ip_idx,
5429                                                      &fillargs);
5430                         goto done;
5431                 }
5432         }
5433
5434         cb->seq = inet6_base_seq(tgt_net);
5435         for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
5436                 idev = __in6_dev_get(dev);
5437                 if (!idev)
5438                         continue;
5439                 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
5440                                      &fillargs);
5441                 if (err < 0)
5442                         goto done;
5443         }
5444 done:
5445         rcu_read_unlock();
5446         if (fillargs.netnsid >= 0)
5447                 put_net(tgt_net);
5448
5449         return err;
5450 }
5451
5452 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5453 {
5454         enum addr_type_t type = UNICAST_ADDR;
5455
5456         return inet6_dump_addr(skb, cb, type);
5457 }
5458
5459 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5460 {
5461         enum addr_type_t type = MULTICAST_ADDR;
5462
5463         return inet6_dump_addr(skb, cb, type);
5464 }
5465
5466
5467 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5468 {
5469         enum addr_type_t type = ANYCAST_ADDR;
5470
5471         return inet6_dump_addr(skb, cb, type);
5472 }
5473
5474 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5475                                        const struct nlmsghdr *nlh,
5476                                        struct nlattr **tb,
5477                                        struct netlink_ext_ack *extack)
5478 {
5479         struct ifaddrmsg *ifm;
5480         int i, err;
5481
5482         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5483                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5484                 return -EINVAL;
5485         }
5486
5487         if (!netlink_strict_get_check(skb))
5488                 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5489                                               ifa_ipv6_policy, extack);
5490
5491         ifm = nlmsg_data(nlh);
5492         if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5493                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5494                 return -EINVAL;
5495         }
5496
5497         err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5498                                             ifa_ipv6_policy, extack);
5499         if (err)
5500                 return err;
5501
5502         for (i = 0; i <= IFA_MAX; i++) {
5503                 if (!tb[i])
5504                         continue;
5505
5506                 switch (i) {
5507                 case IFA_TARGET_NETNSID:
5508                 case IFA_ADDRESS:
5509                 case IFA_LOCAL:
5510                         break;
5511                 default:
5512                         NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5513                         return -EINVAL;
5514                 }
5515         }
5516
5517         return 0;
5518 }
5519
5520 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5521                              struct netlink_ext_ack *extack)
5522 {
5523         struct net *tgt_net = sock_net(in_skb->sk);
5524         struct inet6_fill_args fillargs = {
5525                 .portid = NETLINK_CB(in_skb).portid,
5526                 .seq = nlh->nlmsg_seq,
5527                 .event = RTM_NEWADDR,
5528                 .flags = 0,
5529                 .netnsid = -1,
5530         };
5531         struct ifaddrmsg *ifm;
5532         struct nlattr *tb[IFA_MAX+1];
5533         struct in6_addr *addr = NULL, *peer;
5534         struct net_device *dev = NULL;
5535         struct inet6_ifaddr *ifa;
5536         struct sk_buff *skb;
5537         int err;
5538
5539         err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5540         if (err < 0)
5541                 return err;
5542
5543         if (tb[IFA_TARGET_NETNSID]) {
5544                 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5545
5546                 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5547                                                   fillargs.netnsid);
5548                 if (IS_ERR(tgt_net))
5549                         return PTR_ERR(tgt_net);
5550         }
5551
5552         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5553         if (!addr) {
5554                 err = -EINVAL;
5555                 goto errout;
5556         }
5557         ifm = nlmsg_data(nlh);
5558         if (ifm->ifa_index)
5559                 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5560
5561         ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5562         if (!ifa) {
5563                 err = -EADDRNOTAVAIL;
5564                 goto errout;
5565         }
5566
5567         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5568         if (!skb) {
5569                 err = -ENOBUFS;
5570                 goto errout_ifa;
5571         }
5572
5573         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5574         if (err < 0) {
5575                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5576                 WARN_ON(err == -EMSGSIZE);
5577                 kfree_skb(skb);
5578                 goto errout_ifa;
5579         }
5580         err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5581 errout_ifa:
5582         in6_ifa_put(ifa);
5583 errout:
5584         dev_put(dev);
5585         if (fillargs.netnsid >= 0)
5586                 put_net(tgt_net);
5587
5588         return err;
5589 }
5590
5591 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5592 {
5593         struct sk_buff *skb;
5594         struct net *net = dev_net(ifa->idev->dev);
5595         struct inet6_fill_args fillargs = {
5596                 .portid = 0,
5597                 .seq = 0,
5598                 .event = event,
5599                 .flags = 0,
5600                 .netnsid = -1,
5601         };
5602         int err = -ENOBUFS;
5603
5604         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5605         if (!skb)
5606                 goto errout;
5607
5608         err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5609         if (err < 0) {
5610                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5611                 WARN_ON(err == -EMSGSIZE);
5612                 kfree_skb(skb);
5613                 goto errout;
5614         }
5615         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5616         return;
5617 errout:
5618         if (err < 0)
5619                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5620 }
5621
5622 static void ipv6_store_devconf(const struct ipv6_devconf *cnf,
5623                                __s32 *array, int bytes)
5624 {
5625         BUG_ON(bytes < (DEVCONF_MAX * 4));
5626
5627         memset(array, 0, bytes);
5628         array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding);
5629         array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit);
5630         array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6);
5631         array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra);
5632         array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects);
5633         array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf);
5634         array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits);
5635         array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits);
5636         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5637                 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval));
5638         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5639                 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval));
5640         array[DEVCONF_RTR_SOLICIT_DELAY] =
5641                 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay));
5642         array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version);
5643         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5644                 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval));
5645         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5646                 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval));
5647         array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr);
5648         array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft);
5649         array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft);
5650         array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry);
5651         array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor);
5652         array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses);
5653         array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr);
5654         array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric);
5655         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] =
5656                 READ_ONCE(cnf->accept_ra_min_hop_limit);
5657         array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo);
5658 #ifdef CONFIG_IPV6_ROUTER_PREF
5659         array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref);
5660         array[DEVCONF_RTR_PROBE_INTERVAL] =
5661                 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval));
5662 #ifdef CONFIG_IPV6_ROUTE_INFO
5663         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] =
5664                 READ_ONCE(cnf->accept_ra_rt_info_min_plen);
5665         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] =
5666                 READ_ONCE(cnf->accept_ra_rt_info_max_plen);
5667 #endif
5668 #endif
5669         array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp);
5670         array[DEVCONF_ACCEPT_SOURCE_ROUTE] =
5671                 READ_ONCE(cnf->accept_source_route);
5672 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5673         array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad);
5674         array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic);
5675 #endif
5676 #ifdef CONFIG_IPV6_MROUTE
5677         array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5678 #endif
5679         array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6);
5680         array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad);
5681         array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao);
5682         array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify);
5683         array[DEVCONF_SUPPRESS_FRAG_NDISC] =
5684                 READ_ONCE(cnf->suppress_frag_ndisc);
5685         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] =
5686                 READ_ONCE(cnf->accept_ra_from_local);
5687         array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu);
5688         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] =
5689                 READ_ONCE(cnf->ignore_routes_with_linkdown);
5690         /* we omit DEVCONF_STABLE_SECRET for now */
5691         array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only);
5692         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] =
5693                 READ_ONCE(cnf->drop_unicast_in_l2_multicast);
5694         array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na);
5695         array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down);
5696         array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled);
5697 #ifdef CONFIG_IPV6_SEG6_HMAC
5698         array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac);
5699 #endif
5700         array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad);
5701         array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode);
5702         array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy);
5703         array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass);
5704         array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled);
5705         array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled);
5706         array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id);
5707         array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide);
5708         array[DEVCONF_NDISC_EVICT_NOCARRIER] =
5709                 READ_ONCE(cnf->ndisc_evict_nocarrier);
5710         array[DEVCONF_ACCEPT_UNTRACKED_NA] =
5711                 READ_ONCE(cnf->accept_untracked_na);
5712         array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft);
5713 }
5714
5715 static inline size_t inet6_ifla6_size(void)
5716 {
5717         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5718              + nla_total_size(sizeof(struct ifla_cacheinfo))
5719              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5720              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5721              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5722              + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5723              + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5724              + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5725              + 0;
5726 }
5727
5728 static inline size_t inet6_if_nlmsg_size(void)
5729 {
5730         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5731                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5732                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5733                + nla_total_size(4) /* IFLA_MTU */
5734                + nla_total_size(4) /* IFLA_LINK */
5735                + nla_total_size(1) /* IFLA_OPERSTATE */
5736                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5737 }
5738
5739 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5740                                         int bytes)
5741 {
5742         int i;
5743         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5744         BUG_ON(pad < 0);
5745
5746         /* Use put_unaligned() because stats may not be aligned for u64. */
5747         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5748         for (i = 1; i < ICMP6_MIB_MAX; i++)
5749                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5750
5751         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5752 }
5753
5754 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5755                                         int bytes, size_t syncpoff)
5756 {
5757         int i, c;
5758         u64 buff[IPSTATS_MIB_MAX];
5759         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5760
5761         BUG_ON(pad < 0);
5762
5763         memset(buff, 0, sizeof(buff));
5764         buff[0] = IPSTATS_MIB_MAX;
5765
5766         for_each_possible_cpu(c) {
5767                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5768                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5769         }
5770
5771         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5772         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5773 }
5774
5775 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5776                              int bytes)
5777 {
5778         switch (attrtype) {
5779         case IFLA_INET6_STATS:
5780                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5781                                      offsetof(struct ipstats_mib, syncp));
5782                 break;
5783         case IFLA_INET6_ICMP6STATS:
5784                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5785                 break;
5786         }
5787 }
5788
5789 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5790                                   u32 ext_filter_mask)
5791 {
5792         struct ifla_cacheinfo ci;
5793         struct nlattr *nla;
5794         u32 ra_mtu;
5795
5796         if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags)))
5797                 goto nla_put_failure;
5798         ci.max_reasm_len = IPV6_MAXPLEN;
5799         ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp));
5800         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5801         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5802         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5803                 goto nla_put_failure;
5804         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5805         if (!nla)
5806                 goto nla_put_failure;
5807         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5808
5809         /* XXX - MC not implemented */
5810
5811         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5812                 return 0;
5813
5814         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5815         if (!nla)
5816                 goto nla_put_failure;
5817         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5818
5819         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5820         if (!nla)
5821                 goto nla_put_failure;
5822         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5823
5824         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5825         if (!nla)
5826                 goto nla_put_failure;
5827         read_lock_bh(&idev->lock);
5828         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5829         read_unlock_bh(&idev->lock);
5830
5831         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE,
5832                        READ_ONCE(idev->cnf.addr_gen_mode)))
5833                 goto nla_put_failure;
5834
5835         ra_mtu = READ_ONCE(idev->ra_mtu);
5836         if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu))
5837                 goto nla_put_failure;
5838
5839         return 0;
5840
5841 nla_put_failure:
5842         return -EMSGSIZE;
5843 }
5844
5845 static size_t inet6_get_link_af_size(const struct net_device *dev,
5846                                      u32 ext_filter_mask)
5847 {
5848         if (!__in6_dev_get(dev))
5849                 return 0;
5850
5851         return inet6_ifla6_size();
5852 }
5853
5854 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5855                               u32 ext_filter_mask)
5856 {
5857         struct inet6_dev *idev = __in6_dev_get(dev);
5858
5859         if (!idev)
5860                 return -ENODATA;
5861
5862         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5863                 return -EMSGSIZE;
5864
5865         return 0;
5866 }
5867
5868 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5869                              struct netlink_ext_ack *extack)
5870 {
5871         struct inet6_ifaddr *ifp;
5872         struct net_device *dev = idev->dev;
5873         bool clear_token, update_rs = false;
5874         struct in6_addr ll_addr;
5875
5876         ASSERT_RTNL();
5877
5878         if (!token)
5879                 return -EINVAL;
5880
5881         if (dev->flags & IFF_LOOPBACK) {
5882                 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5883                 return -EINVAL;
5884         }
5885
5886         if (dev->flags & IFF_NOARP) {
5887                 NL_SET_ERR_MSG_MOD(extack,
5888                                    "Device does not do neighbour discovery");
5889                 return -EINVAL;
5890         }
5891
5892         if (!ipv6_accept_ra(idev)) {
5893                 NL_SET_ERR_MSG_MOD(extack,
5894                                    "Router advertisement is disabled on device");
5895                 return -EINVAL;
5896         }
5897
5898         if (READ_ONCE(idev->cnf.rtr_solicits) == 0) {
5899                 NL_SET_ERR_MSG(extack,
5900                                "Router solicitation is disabled on device");
5901                 return -EINVAL;
5902         }
5903
5904         write_lock_bh(&idev->lock);
5905
5906         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5907         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5908
5909         write_unlock_bh(&idev->lock);
5910
5911         clear_token = ipv6_addr_any(token);
5912         if (clear_token)
5913                 goto update_lft;
5914
5915         if (!idev->dead && (idev->if_flags & IF_READY) &&
5916             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5917                              IFA_F_OPTIMISTIC)) {
5918                 /* If we're not ready, then normal ifup will take care
5919                  * of this. Otherwise, we need to request our rs here.
5920                  */
5921                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5922                 update_rs = true;
5923         }
5924
5925 update_lft:
5926         write_lock_bh(&idev->lock);
5927
5928         if (update_rs) {
5929                 idev->if_flags |= IF_RS_SENT;
5930                 idev->rs_interval = rfc3315_s14_backoff_init(
5931                         READ_ONCE(idev->cnf.rtr_solicit_interval));
5932                 idev->rs_probes = 1;
5933                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5934         }
5935
5936         /* Well, that's kinda nasty ... */
5937         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5938                 spin_lock(&ifp->lock);
5939                 if (ifp->tokenized) {
5940                         ifp->valid_lft = 0;
5941                         ifp->prefered_lft = 0;
5942                 }
5943                 spin_unlock(&ifp->lock);
5944         }
5945
5946         write_unlock_bh(&idev->lock);
5947         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5948         addrconf_verify_rtnl(dev_net(dev));
5949         return 0;
5950 }
5951
5952 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5953         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5954         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5955         [IFLA_INET6_RA_MTU]             = { .type = NLA_REJECT,
5956                                             .reject_message =
5957                                                 "IFLA_INET6_RA_MTU can not be set" },
5958 };
5959
5960 static int check_addr_gen_mode(int mode)
5961 {
5962         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5963             mode != IN6_ADDR_GEN_MODE_NONE &&
5964             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5965             mode != IN6_ADDR_GEN_MODE_RANDOM)
5966                 return -EINVAL;
5967         return 1;
5968 }
5969
5970 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5971                                 int mode)
5972 {
5973         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5974             !idev->cnf.stable_secret.initialized &&
5975             !net->ipv6.devconf_dflt->stable_secret.initialized)
5976                 return -EINVAL;
5977         return 1;
5978 }
5979
5980 static int inet6_validate_link_af(const struct net_device *dev,
5981                                   const struct nlattr *nla,
5982                                   struct netlink_ext_ack *extack)
5983 {
5984         struct nlattr *tb[IFLA_INET6_MAX + 1];
5985         struct inet6_dev *idev = NULL;
5986         int err;
5987
5988         if (dev) {
5989                 idev = __in6_dev_get(dev);
5990                 if (!idev)
5991                         return -EAFNOSUPPORT;
5992         }
5993
5994         err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5995                                           inet6_af_policy, extack);
5996         if (err)
5997                 return err;
5998
5999         if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
6000                 return -EINVAL;
6001
6002         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6003                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6004
6005                 if (check_addr_gen_mode(mode) < 0)
6006                         return -EINVAL;
6007                 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
6008                         return -EINVAL;
6009         }
6010
6011         return 0;
6012 }
6013
6014 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
6015                              struct netlink_ext_ack *extack)
6016 {
6017         struct inet6_dev *idev = __in6_dev_get(dev);
6018         struct nlattr *tb[IFLA_INET6_MAX + 1];
6019         int err;
6020
6021         if (!idev)
6022                 return -EAFNOSUPPORT;
6023
6024         if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
6025                 return -EINVAL;
6026
6027         if (tb[IFLA_INET6_TOKEN]) {
6028                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
6029                                         extack);
6030                 if (err)
6031                         return err;
6032         }
6033
6034         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6035                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6036
6037                 WRITE_ONCE(idev->cnf.addr_gen_mode, mode);
6038         }
6039
6040         return 0;
6041 }
6042
6043 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
6044                              u32 portid, u32 seq, int event, unsigned int flags)
6045 {
6046         struct net_device *dev = idev->dev;
6047         struct ifinfomsg *hdr;
6048         struct nlmsghdr *nlh;
6049         int ifindex, iflink;
6050         void *protoinfo;
6051
6052         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
6053         if (!nlh)
6054                 return -EMSGSIZE;
6055
6056         hdr = nlmsg_data(nlh);
6057         hdr->ifi_family = AF_INET6;
6058         hdr->__ifi_pad = 0;
6059         hdr->ifi_type = dev->type;
6060         ifindex = READ_ONCE(dev->ifindex);
6061         hdr->ifi_index = ifindex;
6062         hdr->ifi_flags = dev_get_flags(dev);
6063         hdr->ifi_change = 0;
6064
6065         iflink = dev_get_iflink(dev);
6066         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
6067             (dev->addr_len &&
6068              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
6069             nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) ||
6070             (ifindex != iflink &&
6071              nla_put_u32(skb, IFLA_LINK, iflink)) ||
6072             nla_put_u8(skb, IFLA_OPERSTATE,
6073                        netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6074                 goto nla_put_failure;
6075         protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6076         if (!protoinfo)
6077                 goto nla_put_failure;
6078
6079         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6080                 goto nla_put_failure;
6081
6082         nla_nest_end(skb, protoinfo);
6083         nlmsg_end(skb, nlh);
6084         return 0;
6085
6086 nla_put_failure:
6087         nlmsg_cancel(skb, nlh);
6088         return -EMSGSIZE;
6089 }
6090
6091 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6092                                    struct netlink_ext_ack *extack)
6093 {
6094         struct ifinfomsg *ifm;
6095
6096         if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6097                 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6098                 return -EINVAL;
6099         }
6100
6101         if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6102                 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6103                 return -EINVAL;
6104         }
6105
6106         ifm = nlmsg_data(nlh);
6107         if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6108             ifm->ifi_change || ifm->ifi_index) {
6109                 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6110                 return -EINVAL;
6111         }
6112
6113         return 0;
6114 }
6115
6116 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6117 {
6118         struct net *net = sock_net(skb->sk);
6119         struct {
6120                 unsigned long ifindex;
6121         } *ctx = (void *)cb->ctx;
6122         struct net_device *dev;
6123         struct inet6_dev *idev;
6124         int err;
6125
6126         /* only requests using strict checking can pass data to
6127          * influence the dump
6128          */
6129         if (cb->strict_check) {
6130                 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6131
6132                 if (err < 0)
6133                         return err;
6134         }
6135
6136         err = 0;
6137         rcu_read_lock();
6138         for_each_netdev_dump(net, dev, ctx->ifindex) {
6139                 idev = __in6_dev_get(dev);
6140                 if (!idev)
6141                         continue;
6142                 err = inet6_fill_ifinfo(skb, idev,
6143                                         NETLINK_CB(cb->skb).portid,
6144                                         cb->nlh->nlmsg_seq,
6145                                         RTM_NEWLINK, NLM_F_MULTI);
6146                 if (err < 0)
6147                         break;
6148         }
6149         rcu_read_unlock();
6150
6151         return err;
6152 }
6153
6154 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6155 {
6156         struct sk_buff *skb;
6157         struct net *net = dev_net(idev->dev);
6158         int err = -ENOBUFS;
6159
6160         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6161         if (!skb)
6162                 goto errout;
6163
6164         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6165         if (err < 0) {
6166                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6167                 WARN_ON(err == -EMSGSIZE);
6168                 kfree_skb(skb);
6169                 goto errout;
6170         }
6171         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6172         return;
6173 errout:
6174         if (err < 0)
6175                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6176 }
6177
6178 static inline size_t inet6_prefix_nlmsg_size(void)
6179 {
6180         return NLMSG_ALIGN(sizeof(struct prefixmsg))
6181                + nla_total_size(sizeof(struct in6_addr))
6182                + nla_total_size(sizeof(struct prefix_cacheinfo));
6183 }
6184
6185 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6186                              struct prefix_info *pinfo, u32 portid, u32 seq,
6187                              int event, unsigned int flags)
6188 {
6189         struct prefixmsg *pmsg;
6190         struct nlmsghdr *nlh;
6191         struct prefix_cacheinfo ci;
6192
6193         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6194         if (!nlh)
6195                 return -EMSGSIZE;
6196
6197         pmsg = nlmsg_data(nlh);
6198         pmsg->prefix_family = AF_INET6;
6199         pmsg->prefix_pad1 = 0;
6200         pmsg->prefix_pad2 = 0;
6201         pmsg->prefix_ifindex = idev->dev->ifindex;
6202         pmsg->prefix_len = pinfo->prefix_len;
6203         pmsg->prefix_type = pinfo->type;
6204         pmsg->prefix_pad3 = 0;
6205         pmsg->prefix_flags = pinfo->flags;
6206
6207         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6208                 goto nla_put_failure;
6209         ci.preferred_time = ntohl(pinfo->prefered);
6210         ci.valid_time = ntohl(pinfo->valid);
6211         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6212                 goto nla_put_failure;
6213         nlmsg_end(skb, nlh);
6214         return 0;
6215
6216 nla_put_failure:
6217         nlmsg_cancel(skb, nlh);
6218         return -EMSGSIZE;
6219 }
6220
6221 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6222                          struct prefix_info *pinfo)
6223 {
6224         struct sk_buff *skb;
6225         struct net *net = dev_net(idev->dev);
6226         int err = -ENOBUFS;
6227
6228         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6229         if (!skb)
6230                 goto errout;
6231
6232         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6233         if (err < 0) {
6234                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6235                 WARN_ON(err == -EMSGSIZE);
6236                 kfree_skb(skb);
6237                 goto errout;
6238         }
6239         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6240         return;
6241 errout:
6242         if (err < 0)
6243                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6244 }
6245
6246 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6247 {
6248         struct net *net = dev_net(ifp->idev->dev);
6249
6250         if (event)
6251                 ASSERT_RTNL();
6252
6253         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6254
6255         switch (event) {
6256         case RTM_NEWADDR:
6257                 /*
6258                  * If the address was optimistic we inserted the route at the
6259                  * start of our DAD process, so we don't need to do it again.
6260                  * If the device was taken down in the middle of the DAD
6261                  * cycle there is a race where we could get here without a
6262                  * host route, so nothing to insert. That will be fixed when
6263                  * the device is brought up.
6264                  */
6265                 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6266                         ip6_ins_rt(net, ifp->rt);
6267                 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6268                         pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6269                                 &ifp->addr, ifp->idev->dev->name);
6270                 }
6271
6272                 if (ifp->idev->cnf.forwarding)
6273                         addrconf_join_anycast(ifp);
6274                 if (!ipv6_addr_any(&ifp->peer_addr))
6275                         addrconf_prefix_route(&ifp->peer_addr, 128,
6276                                               ifp->rt_priority, ifp->idev->dev,
6277                                               0, 0, GFP_ATOMIC);
6278                 break;
6279         case RTM_DELADDR:
6280                 if (ifp->idev->cnf.forwarding)
6281                         addrconf_leave_anycast(ifp);
6282                 addrconf_leave_solict(ifp->idev, &ifp->addr);
6283                 if (!ipv6_addr_any(&ifp->peer_addr)) {
6284                         struct fib6_info *rt;
6285
6286                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6287                                                        ifp->idev->dev, 0, 0,
6288                                                        false);
6289                         if (rt)
6290                                 ip6_del_rt(net, rt, false);
6291                 }
6292                 if (ifp->rt) {
6293                         ip6_del_rt(net, ifp->rt, false);
6294                         ifp->rt = NULL;
6295                 }
6296                 rt_genid_bump_ipv6(net);
6297                 break;
6298         }
6299         atomic_inc(&net->ipv6.dev_addr_genid);
6300 }
6301
6302 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6303 {
6304         if (likely(ifp->idev->dead == 0))
6305                 __ipv6_ifa_notify(event, ifp);
6306 }
6307
6308 #ifdef CONFIG_SYSCTL
6309
6310 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6311                 void *buffer, size_t *lenp, loff_t *ppos)
6312 {
6313         int *valp = ctl->data;
6314         int val = *valp;
6315         loff_t pos = *ppos;
6316         struct ctl_table lctl;
6317         int ret;
6318
6319         /*
6320          * ctl->data points to idev->cnf.forwarding, we should
6321          * not modify it until we get the rtnl lock.
6322          */
6323         lctl = *ctl;
6324         lctl.data = &val;
6325
6326         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6327
6328         if (write)
6329                 ret = addrconf_fixup_forwarding(ctl, valp, val);
6330         if (ret)
6331                 *ppos = pos;
6332         return ret;
6333 }
6334
6335 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6336                 void *buffer, size_t *lenp, loff_t *ppos)
6337 {
6338         struct inet6_dev *idev = ctl->extra1;
6339         int min_mtu = IPV6_MIN_MTU;
6340         struct ctl_table lctl;
6341
6342         lctl = *ctl;
6343         lctl.extra1 = &min_mtu;
6344         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6345
6346         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6347 }
6348
6349 static void dev_disable_change(struct inet6_dev *idev)
6350 {
6351         struct netdev_notifier_info info;
6352
6353         if (!idev || !idev->dev)
6354                 return;
6355
6356         netdev_notifier_info_init(&info, idev->dev);
6357         if (idev->cnf.disable_ipv6)
6358                 addrconf_notify(NULL, NETDEV_DOWN, &info);
6359         else
6360                 addrconf_notify(NULL, NETDEV_UP, &info);
6361 }
6362
6363 static void addrconf_disable_change(struct net *net, __s32 newf)
6364 {
6365         struct net_device *dev;
6366         struct inet6_dev *idev;
6367
6368         for_each_netdev(net, dev) {
6369                 idev = __in6_dev_get(dev);
6370                 if (idev) {
6371                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6372
6373                         WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6374                         if (changed)
6375                                 dev_disable_change(idev);
6376                 }
6377         }
6378 }
6379
6380 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6381 {
6382         struct net *net = (struct net *)table->extra2;
6383         int old;
6384
6385         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6386                 WRITE_ONCE(*p, newf);
6387                 return 0;
6388         }
6389
6390         if (!rtnl_trylock())
6391                 return restart_syscall();
6392
6393         old = *p;
6394         WRITE_ONCE(*p, newf);
6395
6396         if (p == &net->ipv6.devconf_all->disable_ipv6) {
6397                 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6398                 addrconf_disable_change(net, newf);
6399         } else if ((!newf) ^ (!old))
6400                 dev_disable_change((struct inet6_dev *)table->extra1);
6401
6402         rtnl_unlock();
6403         return 0;
6404 }
6405
6406 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6407                 void *buffer, size_t *lenp, loff_t *ppos)
6408 {
6409         int *valp = ctl->data;
6410         int val = *valp;
6411         loff_t pos = *ppos;
6412         struct ctl_table lctl;
6413         int ret;
6414
6415         /*
6416          * ctl->data points to idev->cnf.disable_ipv6, we should
6417          * not modify it until we get the rtnl lock.
6418          */
6419         lctl = *ctl;
6420         lctl.data = &val;
6421
6422         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6423
6424         if (write)
6425                 ret = addrconf_disable_ipv6(ctl, valp, val);
6426         if (ret)
6427                 *ppos = pos;
6428         return ret;
6429 }
6430
6431 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6432                 void *buffer, size_t *lenp, loff_t *ppos)
6433 {
6434         int *valp = ctl->data;
6435         int ret;
6436         int old, new;
6437
6438         old = *valp;
6439         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6440         new = *valp;
6441
6442         if (write && old != new) {
6443                 struct net *net = ctl->extra2;
6444
6445                 if (!rtnl_trylock())
6446                         return restart_syscall();
6447
6448                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6449                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6450                                                      NETCONFA_PROXY_NEIGH,
6451                                                      NETCONFA_IFINDEX_DEFAULT,
6452                                                      net->ipv6.devconf_dflt);
6453                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6454                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6455                                                      NETCONFA_PROXY_NEIGH,
6456                                                      NETCONFA_IFINDEX_ALL,
6457                                                      net->ipv6.devconf_all);
6458                 else {
6459                         struct inet6_dev *idev = ctl->extra1;
6460
6461                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6462                                                      NETCONFA_PROXY_NEIGH,
6463                                                      idev->dev->ifindex,
6464                                                      &idev->cnf);
6465                 }
6466                 rtnl_unlock();
6467         }
6468
6469         return ret;
6470 }
6471
6472 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6473                                          void *buffer, size_t *lenp,
6474                                          loff_t *ppos)
6475 {
6476         int ret = 0;
6477         u32 new_val;
6478         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6479         struct net *net = (struct net *)ctl->extra2;
6480         struct ctl_table tmp = {
6481                 .data = &new_val,
6482                 .maxlen = sizeof(new_val),
6483                 .mode = ctl->mode,
6484         };
6485
6486         if (!rtnl_trylock())
6487                 return restart_syscall();
6488
6489         new_val = *((u32 *)ctl->data);
6490
6491         ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6492         if (ret != 0)
6493                 goto out;
6494
6495         if (write) {
6496                 if (check_addr_gen_mode(new_val) < 0) {
6497                         ret = -EINVAL;
6498                         goto out;
6499                 }
6500
6501                 if (idev) {
6502                         if (check_stable_privacy(idev, net, new_val) < 0) {
6503                                 ret = -EINVAL;
6504                                 goto out;
6505                         }
6506
6507                         if (idev->cnf.addr_gen_mode != new_val) {
6508                                 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val);
6509                                 addrconf_init_auto_addrs(idev->dev);
6510                         }
6511                 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6512                         struct net_device *dev;
6513
6514                         WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val);
6515                         for_each_netdev(net, dev) {
6516                                 idev = __in6_dev_get(dev);
6517                                 if (idev &&
6518                                     idev->cnf.addr_gen_mode != new_val) {
6519                                         WRITE_ONCE(idev->cnf.addr_gen_mode,
6520                                                   new_val);
6521                                         addrconf_init_auto_addrs(idev->dev);
6522                                 }
6523                         }
6524                 }
6525
6526                 WRITE_ONCE(*((u32 *)ctl->data), new_val);
6527         }
6528
6529 out:
6530         rtnl_unlock();
6531
6532         return ret;
6533 }
6534
6535 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6536                                          void *buffer, size_t *lenp,
6537                                          loff_t *ppos)
6538 {
6539         int err;
6540         struct in6_addr addr;
6541         char str[IPV6_MAX_STRLEN];
6542         struct ctl_table lctl = *ctl;
6543         struct net *net = ctl->extra2;
6544         struct ipv6_stable_secret *secret = ctl->data;
6545
6546         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6547                 return -EIO;
6548
6549         lctl.maxlen = IPV6_MAX_STRLEN;
6550         lctl.data = str;
6551
6552         if (!rtnl_trylock())
6553                 return restart_syscall();
6554
6555         if (!write && !secret->initialized) {
6556                 err = -EIO;
6557                 goto out;
6558         }
6559
6560         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6561         if (err >= sizeof(str)) {
6562                 err = -EIO;
6563                 goto out;
6564         }
6565
6566         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6567         if (err || !write)
6568                 goto out;
6569
6570         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6571                 err = -EIO;
6572                 goto out;
6573         }
6574
6575         secret->initialized = true;
6576         secret->secret = addr;
6577
6578         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6579                 struct net_device *dev;
6580
6581                 for_each_netdev(net, dev) {
6582                         struct inet6_dev *idev = __in6_dev_get(dev);
6583
6584                         if (idev) {
6585                                 WRITE_ONCE(idev->cnf.addr_gen_mode,
6586                                            IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6587                         }
6588                 }
6589         } else {
6590                 struct inet6_dev *idev = ctl->extra1;
6591
6592                 WRITE_ONCE(idev->cnf.addr_gen_mode,
6593                            IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6594         }
6595
6596 out:
6597         rtnl_unlock();
6598
6599         return err;
6600 }
6601
6602 static
6603 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6604                                                 int write, void *buffer,
6605                                                 size_t *lenp,
6606                                                 loff_t *ppos)
6607 {
6608         int *valp = ctl->data;
6609         int val = *valp;
6610         loff_t pos = *ppos;
6611         struct ctl_table lctl;
6612         int ret;
6613
6614         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6615          * we should not modify it until we get the rtnl lock.
6616          */
6617         lctl = *ctl;
6618         lctl.data = &val;
6619
6620         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6621
6622         if (write)
6623                 ret = addrconf_fixup_linkdown(ctl, valp, val);
6624         if (ret)
6625                 *ppos = pos;
6626         return ret;
6627 }
6628
6629 static
6630 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6631 {
6632         if (rt) {
6633                 if (action)
6634                         rt->dst.flags |= DST_NOPOLICY;
6635                 else
6636                         rt->dst.flags &= ~DST_NOPOLICY;
6637         }
6638 }
6639
6640 static
6641 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6642 {
6643         struct inet6_ifaddr *ifa;
6644
6645         read_lock_bh(&idev->lock);
6646         list_for_each_entry(ifa, &idev->addr_list, if_list) {
6647                 spin_lock(&ifa->lock);
6648                 if (ifa->rt) {
6649                         /* host routes only use builtin fib6_nh */
6650                         struct fib6_nh *nh = ifa->rt->fib6_nh;
6651                         int cpu;
6652
6653                         rcu_read_lock();
6654                         ifa->rt->dst_nopolicy = val ? true : false;
6655                         if (nh->rt6i_pcpu) {
6656                                 for_each_possible_cpu(cpu) {
6657                                         struct rt6_info **rtp;
6658
6659                                         rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6660                                         addrconf_set_nopolicy(*rtp, val);
6661                                 }
6662                         }
6663                         rcu_read_unlock();
6664                 }
6665                 spin_unlock(&ifa->lock);
6666         }
6667         read_unlock_bh(&idev->lock);
6668 }
6669
6670 static
6671 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6672 {
6673         struct net *net = (struct net *)ctl->extra2;
6674         struct inet6_dev *idev;
6675
6676         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6677                 WRITE_ONCE(*valp, val);
6678                 return 0;
6679         }
6680
6681         if (!rtnl_trylock())
6682                 return restart_syscall();
6683
6684         WRITE_ONCE(*valp, val);
6685
6686         if (valp == &net->ipv6.devconf_all->disable_policy)  {
6687                 struct net_device *dev;
6688
6689                 for_each_netdev(net, dev) {
6690                         idev = __in6_dev_get(dev);
6691                         if (idev)
6692                                 addrconf_disable_policy_idev(idev, val);
6693                 }
6694         } else {
6695                 idev = (struct inet6_dev *)ctl->extra1;
6696                 addrconf_disable_policy_idev(idev, val);
6697         }
6698
6699         rtnl_unlock();
6700         return 0;
6701 }
6702
6703 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6704                                    void *buffer, size_t *lenp, loff_t *ppos)
6705 {
6706         int *valp = ctl->data;
6707         int val = *valp;
6708         loff_t pos = *ppos;
6709         struct ctl_table lctl;
6710         int ret;
6711
6712         lctl = *ctl;
6713         lctl.data = &val;
6714         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6715
6716         if (write && (*valp != val))
6717                 ret = addrconf_disable_policy(ctl, valp, val);
6718
6719         if (ret)
6720                 *ppos = pos;
6721
6722         return ret;
6723 }
6724
6725 static int minus_one = -1;
6726 static const int two_five_five = 255;
6727 static u32 ioam6_if_id_max = U16_MAX;
6728
6729 static const struct ctl_table addrconf_sysctl[] = {
6730         {
6731                 .procname       = "forwarding",
6732                 .data           = &ipv6_devconf.forwarding,
6733                 .maxlen         = sizeof(int),
6734                 .mode           = 0644,
6735                 .proc_handler   = addrconf_sysctl_forward,
6736         },
6737         {
6738                 .procname       = "hop_limit",
6739                 .data           = &ipv6_devconf.hop_limit,
6740                 .maxlen         = sizeof(int),
6741                 .mode           = 0644,
6742                 .proc_handler   = proc_dointvec_minmax,
6743                 .extra1         = (void *)SYSCTL_ONE,
6744                 .extra2         = (void *)&two_five_five,
6745         },
6746         {
6747                 .procname       = "mtu",
6748                 .data           = &ipv6_devconf.mtu6,
6749                 .maxlen         = sizeof(int),
6750                 .mode           = 0644,
6751                 .proc_handler   = addrconf_sysctl_mtu,
6752         },
6753         {
6754                 .procname       = "accept_ra",
6755                 .data           = &ipv6_devconf.accept_ra,
6756                 .maxlen         = sizeof(int),
6757                 .mode           = 0644,
6758                 .proc_handler   = proc_dointvec,
6759         },
6760         {
6761                 .procname       = "accept_redirects",
6762                 .data           = &ipv6_devconf.accept_redirects,
6763                 .maxlen         = sizeof(int),
6764                 .mode           = 0644,
6765                 .proc_handler   = proc_dointvec,
6766         },
6767         {
6768                 .procname       = "autoconf",
6769                 .data           = &ipv6_devconf.autoconf,
6770                 .maxlen         = sizeof(int),
6771                 .mode           = 0644,
6772                 .proc_handler   = proc_dointvec,
6773         },
6774         {
6775                 .procname       = "dad_transmits",
6776                 .data           = &ipv6_devconf.dad_transmits,
6777                 .maxlen         = sizeof(int),
6778                 .mode           = 0644,
6779                 .proc_handler   = proc_dointvec,
6780         },
6781         {
6782                 .procname       = "router_solicitations",
6783                 .data           = &ipv6_devconf.rtr_solicits,
6784                 .maxlen         = sizeof(int),
6785                 .mode           = 0644,
6786                 .proc_handler   = proc_dointvec_minmax,
6787                 .extra1         = &minus_one,
6788         },
6789         {
6790                 .procname       = "router_solicitation_interval",
6791                 .data           = &ipv6_devconf.rtr_solicit_interval,
6792                 .maxlen         = sizeof(int),
6793                 .mode           = 0644,
6794                 .proc_handler   = proc_dointvec_jiffies,
6795         },
6796         {
6797                 .procname       = "router_solicitation_max_interval",
6798                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6799                 .maxlen         = sizeof(int),
6800                 .mode           = 0644,
6801                 .proc_handler   = proc_dointvec_jiffies,
6802         },
6803         {
6804                 .procname       = "router_solicitation_delay",
6805                 .data           = &ipv6_devconf.rtr_solicit_delay,
6806                 .maxlen         = sizeof(int),
6807                 .mode           = 0644,
6808                 .proc_handler   = proc_dointvec_jiffies,
6809         },
6810         {
6811                 .procname       = "force_mld_version",
6812                 .data           = &ipv6_devconf.force_mld_version,
6813                 .maxlen         = sizeof(int),
6814                 .mode           = 0644,
6815                 .proc_handler   = proc_dointvec,
6816         },
6817         {
6818                 .procname       = "mldv1_unsolicited_report_interval",
6819                 .data           =
6820                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6821                 .maxlen         = sizeof(int),
6822                 .mode           = 0644,
6823                 .proc_handler   = proc_dointvec_ms_jiffies,
6824         },
6825         {
6826                 .procname       = "mldv2_unsolicited_report_interval",
6827                 .data           =
6828                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6829                 .maxlen         = sizeof(int),
6830                 .mode           = 0644,
6831                 .proc_handler   = proc_dointvec_ms_jiffies,
6832         },
6833         {
6834                 .procname       = "use_tempaddr",
6835                 .data           = &ipv6_devconf.use_tempaddr,
6836                 .maxlen         = sizeof(int),
6837                 .mode           = 0644,
6838                 .proc_handler   = proc_dointvec,
6839         },
6840         {
6841                 .procname       = "temp_valid_lft",
6842                 .data           = &ipv6_devconf.temp_valid_lft,
6843                 .maxlen         = sizeof(int),
6844                 .mode           = 0644,
6845                 .proc_handler   = proc_dointvec,
6846         },
6847         {
6848                 .procname       = "temp_prefered_lft",
6849                 .data           = &ipv6_devconf.temp_prefered_lft,
6850                 .maxlen         = sizeof(int),
6851                 .mode           = 0644,
6852                 .proc_handler   = proc_dointvec,
6853         },
6854         {
6855                 .procname       = "regen_min_advance",
6856                 .data           = &ipv6_devconf.regen_min_advance,
6857                 .maxlen         = sizeof(int),
6858                 .mode           = 0644,
6859                 .proc_handler   = proc_dointvec,
6860         },
6861         {
6862                 .procname       = "regen_max_retry",
6863                 .data           = &ipv6_devconf.regen_max_retry,
6864                 .maxlen         = sizeof(int),
6865                 .mode           = 0644,
6866                 .proc_handler   = proc_dointvec,
6867         },
6868         {
6869                 .procname       = "max_desync_factor",
6870                 .data           = &ipv6_devconf.max_desync_factor,
6871                 .maxlen         = sizeof(int),
6872                 .mode           = 0644,
6873                 .proc_handler   = proc_dointvec,
6874         },
6875         {
6876                 .procname       = "max_addresses",
6877                 .data           = &ipv6_devconf.max_addresses,
6878                 .maxlen         = sizeof(int),
6879                 .mode           = 0644,
6880                 .proc_handler   = proc_dointvec,
6881         },
6882         {
6883                 .procname       = "accept_ra_defrtr",
6884                 .data           = &ipv6_devconf.accept_ra_defrtr,
6885                 .maxlen         = sizeof(int),
6886                 .mode           = 0644,
6887                 .proc_handler   = proc_dointvec,
6888         },
6889         {
6890                 .procname       = "ra_defrtr_metric",
6891                 .data           = &ipv6_devconf.ra_defrtr_metric,
6892                 .maxlen         = sizeof(u32),
6893                 .mode           = 0644,
6894                 .proc_handler   = proc_douintvec_minmax,
6895                 .extra1         = (void *)SYSCTL_ONE,
6896         },
6897         {
6898                 .procname       = "accept_ra_min_hop_limit",
6899                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6900                 .maxlen         = sizeof(int),
6901                 .mode           = 0644,
6902                 .proc_handler   = proc_dointvec,
6903         },
6904         {
6905                 .procname       = "accept_ra_min_lft",
6906                 .data           = &ipv6_devconf.accept_ra_min_lft,
6907                 .maxlen         = sizeof(int),
6908                 .mode           = 0644,
6909                 .proc_handler   = proc_dointvec,
6910         },
6911         {
6912                 .procname       = "accept_ra_pinfo",
6913                 .data           = &ipv6_devconf.accept_ra_pinfo,
6914                 .maxlen         = sizeof(int),
6915                 .mode           = 0644,
6916                 .proc_handler   = proc_dointvec,
6917         },
6918         {
6919                 .procname       = "ra_honor_pio_life",
6920                 .data           = &ipv6_devconf.ra_honor_pio_life,
6921                 .maxlen         = sizeof(u8),
6922                 .mode           = 0644,
6923                 .proc_handler   = proc_dou8vec_minmax,
6924                 .extra1         = SYSCTL_ZERO,
6925                 .extra2         = SYSCTL_ONE,
6926         },
6927 #ifdef CONFIG_IPV6_ROUTER_PREF
6928         {
6929                 .procname       = "accept_ra_rtr_pref",
6930                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6931                 .maxlen         = sizeof(int),
6932                 .mode           = 0644,
6933                 .proc_handler   = proc_dointvec,
6934         },
6935         {
6936                 .procname       = "router_probe_interval",
6937                 .data           = &ipv6_devconf.rtr_probe_interval,
6938                 .maxlen         = sizeof(int),
6939                 .mode           = 0644,
6940                 .proc_handler   = proc_dointvec_jiffies,
6941         },
6942 #ifdef CONFIG_IPV6_ROUTE_INFO
6943         {
6944                 .procname       = "accept_ra_rt_info_min_plen",
6945                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6946                 .maxlen         = sizeof(int),
6947                 .mode           = 0644,
6948                 .proc_handler   = proc_dointvec,
6949         },
6950         {
6951                 .procname       = "accept_ra_rt_info_max_plen",
6952                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6953                 .maxlen         = sizeof(int),
6954                 .mode           = 0644,
6955                 .proc_handler   = proc_dointvec,
6956         },
6957 #endif
6958 #endif
6959         {
6960                 .procname       = "proxy_ndp",
6961                 .data           = &ipv6_devconf.proxy_ndp,
6962                 .maxlen         = sizeof(int),
6963                 .mode           = 0644,
6964                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6965         },
6966         {
6967                 .procname       = "accept_source_route",
6968                 .data           = &ipv6_devconf.accept_source_route,
6969                 .maxlen         = sizeof(int),
6970                 .mode           = 0644,
6971                 .proc_handler   = proc_dointvec,
6972         },
6973 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6974         {
6975                 .procname       = "optimistic_dad",
6976                 .data           = &ipv6_devconf.optimistic_dad,
6977                 .maxlen         = sizeof(int),
6978                 .mode           = 0644,
6979                 .proc_handler   = proc_dointvec,
6980         },
6981         {
6982                 .procname       = "use_optimistic",
6983                 .data           = &ipv6_devconf.use_optimistic,
6984                 .maxlen         = sizeof(int),
6985                 .mode           = 0644,
6986                 .proc_handler   = proc_dointvec,
6987         },
6988 #endif
6989 #ifdef CONFIG_IPV6_MROUTE
6990         {
6991                 .procname       = "mc_forwarding",
6992                 .data           = &ipv6_devconf.mc_forwarding,
6993                 .maxlen         = sizeof(int),
6994                 .mode           = 0444,
6995                 .proc_handler   = proc_dointvec,
6996         },
6997 #endif
6998         {
6999                 .procname       = "disable_ipv6",
7000                 .data           = &ipv6_devconf.disable_ipv6,
7001                 .maxlen         = sizeof(int),
7002                 .mode           = 0644,
7003                 .proc_handler   = addrconf_sysctl_disable,
7004         },
7005         {
7006                 .procname       = "accept_dad",
7007                 .data           = &ipv6_devconf.accept_dad,
7008                 .maxlen         = sizeof(int),
7009                 .mode           = 0644,
7010                 .proc_handler   = proc_dointvec,
7011         },
7012         {
7013                 .procname       = "force_tllao",
7014                 .data           = &ipv6_devconf.force_tllao,
7015                 .maxlen         = sizeof(int),
7016                 .mode           = 0644,
7017                 .proc_handler   = proc_dointvec
7018         },
7019         {
7020                 .procname       = "ndisc_notify",
7021                 .data           = &ipv6_devconf.ndisc_notify,
7022                 .maxlen         = sizeof(int),
7023                 .mode           = 0644,
7024                 .proc_handler   = proc_dointvec
7025         },
7026         {
7027                 .procname       = "suppress_frag_ndisc",
7028                 .data           = &ipv6_devconf.suppress_frag_ndisc,
7029                 .maxlen         = sizeof(int),
7030                 .mode           = 0644,
7031                 .proc_handler   = proc_dointvec
7032         },
7033         {
7034                 .procname       = "accept_ra_from_local",
7035                 .data           = &ipv6_devconf.accept_ra_from_local,
7036                 .maxlen         = sizeof(int),
7037                 .mode           = 0644,
7038                 .proc_handler   = proc_dointvec,
7039         },
7040         {
7041                 .procname       = "accept_ra_mtu",
7042                 .data           = &ipv6_devconf.accept_ra_mtu,
7043                 .maxlen         = sizeof(int),
7044                 .mode           = 0644,
7045                 .proc_handler   = proc_dointvec,
7046         },
7047         {
7048                 .procname       = "stable_secret",
7049                 .data           = &ipv6_devconf.stable_secret,
7050                 .maxlen         = IPV6_MAX_STRLEN,
7051                 .mode           = 0600,
7052                 .proc_handler   = addrconf_sysctl_stable_secret,
7053         },
7054         {
7055                 .procname       = "use_oif_addrs_only",
7056                 .data           = &ipv6_devconf.use_oif_addrs_only,
7057                 .maxlen         = sizeof(int),
7058                 .mode           = 0644,
7059                 .proc_handler   = proc_dointvec,
7060         },
7061         {
7062                 .procname       = "ignore_routes_with_linkdown",
7063                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
7064                 .maxlen         = sizeof(int),
7065                 .mode           = 0644,
7066                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
7067         },
7068         {
7069                 .procname       = "drop_unicast_in_l2_multicast",
7070                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
7071                 .maxlen         = sizeof(int),
7072                 .mode           = 0644,
7073                 .proc_handler   = proc_dointvec,
7074         },
7075         {
7076                 .procname       = "drop_unsolicited_na",
7077                 .data           = &ipv6_devconf.drop_unsolicited_na,
7078                 .maxlen         = sizeof(int),
7079                 .mode           = 0644,
7080                 .proc_handler   = proc_dointvec,
7081         },
7082         {
7083                 .procname       = "keep_addr_on_down",
7084                 .data           = &ipv6_devconf.keep_addr_on_down,
7085                 .maxlen         = sizeof(int),
7086                 .mode           = 0644,
7087                 .proc_handler   = proc_dointvec,
7088
7089         },
7090         {
7091                 .procname       = "seg6_enabled",
7092                 .data           = &ipv6_devconf.seg6_enabled,
7093                 .maxlen         = sizeof(int),
7094                 .mode           = 0644,
7095                 .proc_handler   = proc_dointvec,
7096         },
7097 #ifdef CONFIG_IPV6_SEG6_HMAC
7098         {
7099                 .procname       = "seg6_require_hmac",
7100                 .data           = &ipv6_devconf.seg6_require_hmac,
7101                 .maxlen         = sizeof(int),
7102                 .mode           = 0644,
7103                 .proc_handler   = proc_dointvec,
7104         },
7105 #endif
7106         {
7107                 .procname       = "enhanced_dad",
7108                 .data           = &ipv6_devconf.enhanced_dad,
7109                 .maxlen         = sizeof(int),
7110                 .mode           = 0644,
7111                 .proc_handler   = proc_dointvec,
7112         },
7113         {
7114                 .procname       = "addr_gen_mode",
7115                 .data           = &ipv6_devconf.addr_gen_mode,
7116                 .maxlen         = sizeof(int),
7117                 .mode           = 0644,
7118                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
7119         },
7120         {
7121                 .procname       = "disable_policy",
7122                 .data           = &ipv6_devconf.disable_policy,
7123                 .maxlen         = sizeof(int),
7124                 .mode           = 0644,
7125                 .proc_handler   = addrconf_sysctl_disable_policy,
7126         },
7127         {
7128                 .procname       = "ndisc_tclass",
7129                 .data           = &ipv6_devconf.ndisc_tclass,
7130                 .maxlen         = sizeof(int),
7131                 .mode           = 0644,
7132                 .proc_handler   = proc_dointvec_minmax,
7133                 .extra1         = (void *)SYSCTL_ZERO,
7134                 .extra2         = (void *)&two_five_five,
7135         },
7136         {
7137                 .procname       = "rpl_seg_enabled",
7138                 .data           = &ipv6_devconf.rpl_seg_enabled,
7139                 .maxlen         = sizeof(int),
7140                 .mode           = 0644,
7141                 .proc_handler   = proc_dointvec,
7142         },
7143         {
7144                 .procname       = "ioam6_enabled",
7145                 .data           = &ipv6_devconf.ioam6_enabled,
7146                 .maxlen         = sizeof(u8),
7147                 .mode           = 0644,
7148                 .proc_handler   = proc_dou8vec_minmax,
7149                 .extra1         = (void *)SYSCTL_ZERO,
7150                 .extra2         = (void *)SYSCTL_ONE,
7151         },
7152         {
7153                 .procname       = "ioam6_id",
7154                 .data           = &ipv6_devconf.ioam6_id,
7155                 .maxlen         = sizeof(u32),
7156                 .mode           = 0644,
7157                 .proc_handler   = proc_douintvec_minmax,
7158                 .extra1         = (void *)SYSCTL_ZERO,
7159                 .extra2         = (void *)&ioam6_if_id_max,
7160         },
7161         {
7162                 .procname       = "ioam6_id_wide",
7163                 .data           = &ipv6_devconf.ioam6_id_wide,
7164                 .maxlen         = sizeof(u32),
7165                 .mode           = 0644,
7166                 .proc_handler   = proc_douintvec,
7167         },
7168         {
7169                 .procname       = "ndisc_evict_nocarrier",
7170                 .data           = &ipv6_devconf.ndisc_evict_nocarrier,
7171                 .maxlen         = sizeof(u8),
7172                 .mode           = 0644,
7173                 .proc_handler   = proc_dou8vec_minmax,
7174                 .extra1         = (void *)SYSCTL_ZERO,
7175                 .extra2         = (void *)SYSCTL_ONE,
7176         },
7177         {
7178                 .procname       = "accept_untracked_na",
7179                 .data           = &ipv6_devconf.accept_untracked_na,
7180                 .maxlen         = sizeof(int),
7181                 .mode           = 0644,
7182                 .proc_handler   = proc_dointvec_minmax,
7183                 .extra1         = SYSCTL_ZERO,
7184                 .extra2         = SYSCTL_TWO,
7185         },
7186         {
7187                 /* sentinel */
7188         }
7189 };
7190
7191 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7192                 struct inet6_dev *idev, struct ipv6_devconf *p)
7193 {
7194         int i, ifindex;
7195         struct ctl_table *table;
7196         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7197
7198         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7199         if (!table)
7200                 goto out;
7201
7202         for (i = 0; table[i].data; i++) {
7203                 table[i].data += (char *)p - (char *)&ipv6_devconf;
7204                 /* If one of these is already set, then it is not safe to
7205                  * overwrite either of them: this makes proc_dointvec_minmax
7206                  * usable.
7207                  */
7208                 if (!table[i].extra1 && !table[i].extra2) {
7209                         table[i].extra1 = idev; /* embedded; no ref */
7210                         table[i].extra2 = net;
7211                 }
7212         }
7213
7214         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7215
7216         p->sysctl_header = register_net_sysctl_sz(net, path, table,
7217                                                   ARRAY_SIZE(addrconf_sysctl));
7218         if (!p->sysctl_header)
7219                 goto free;
7220
7221         if (!strcmp(dev_name, "all"))
7222                 ifindex = NETCONFA_IFINDEX_ALL;
7223         else if (!strcmp(dev_name, "default"))
7224                 ifindex = NETCONFA_IFINDEX_DEFAULT;
7225         else
7226                 ifindex = idev->dev->ifindex;
7227         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7228                                      ifindex, p);
7229         return 0;
7230
7231 free:
7232         kfree(table);
7233 out:
7234         return -ENOBUFS;
7235 }
7236
7237 static void __addrconf_sysctl_unregister(struct net *net,
7238                                          struct ipv6_devconf *p, int ifindex)
7239 {
7240         struct ctl_table *table;
7241
7242         if (!p->sysctl_header)
7243                 return;
7244
7245         table = p->sysctl_header->ctl_table_arg;
7246         unregister_net_sysctl_table(p->sysctl_header);
7247         p->sysctl_header = NULL;
7248         kfree(table);
7249
7250         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7251 }
7252
7253 static int addrconf_sysctl_register(struct inet6_dev *idev)
7254 {
7255         int err;
7256
7257         if (!sysctl_dev_name_is_allowed(idev->dev->name))
7258                 return -EINVAL;
7259
7260         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7261                                     &ndisc_ifinfo_sysctl_change);
7262         if (err)
7263                 return err;
7264         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7265                                          idev, &idev->cnf);
7266         if (err)
7267                 neigh_sysctl_unregister(idev->nd_parms);
7268
7269         return err;
7270 }
7271
7272 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7273 {
7274         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7275                                      idev->dev->ifindex);
7276         neigh_sysctl_unregister(idev->nd_parms);
7277 }
7278
7279
7280 #endif
7281
7282 static int __net_init addrconf_init_net(struct net *net)
7283 {
7284         int err = -ENOMEM;
7285         struct ipv6_devconf *all, *dflt;
7286
7287         spin_lock_init(&net->ipv6.addrconf_hash_lock);
7288         INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7289         net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7290                                            sizeof(struct hlist_head),
7291                                            GFP_KERNEL);
7292         if (!net->ipv6.inet6_addr_lst)
7293                 goto err_alloc_addr;
7294
7295         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7296         if (!all)
7297                 goto err_alloc_all;
7298
7299         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7300         if (!dflt)
7301                 goto err_alloc_dflt;
7302
7303         if (!net_eq(net, &init_net)) {
7304                 switch (net_inherit_devconf()) {
7305                 case 1:  /* copy from init_net */
7306                         memcpy(all, init_net.ipv6.devconf_all,
7307                                sizeof(ipv6_devconf));
7308                         memcpy(dflt, init_net.ipv6.devconf_dflt,
7309                                sizeof(ipv6_devconf_dflt));
7310                         break;
7311                 case 3: /* copy from the current netns */
7312                         memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7313                                sizeof(ipv6_devconf));
7314                         memcpy(dflt,
7315                                current->nsproxy->net_ns->ipv6.devconf_dflt,
7316                                sizeof(ipv6_devconf_dflt));
7317                         break;
7318                 case 0:
7319                 case 2:
7320                         /* use compiled values */
7321                         break;
7322                 }
7323         }
7324
7325         /* these will be inherited by all namespaces */
7326         dflt->autoconf = ipv6_defaults.autoconf;
7327         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7328
7329         dflt->stable_secret.initialized = false;
7330         all->stable_secret.initialized = false;
7331
7332         net->ipv6.devconf_all = all;
7333         net->ipv6.devconf_dflt = dflt;
7334
7335 #ifdef CONFIG_SYSCTL
7336         err = __addrconf_sysctl_register(net, "all", NULL, all);
7337         if (err < 0)
7338                 goto err_reg_all;
7339
7340         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7341         if (err < 0)
7342                 goto err_reg_dflt;
7343 #endif
7344         return 0;
7345
7346 #ifdef CONFIG_SYSCTL
7347 err_reg_dflt:
7348         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7349 err_reg_all:
7350         kfree(dflt);
7351         net->ipv6.devconf_dflt = NULL;
7352 #endif
7353 err_alloc_dflt:
7354         kfree(all);
7355         net->ipv6.devconf_all = NULL;
7356 err_alloc_all:
7357         kfree(net->ipv6.inet6_addr_lst);
7358 err_alloc_addr:
7359         return err;
7360 }
7361
7362 static void __net_exit addrconf_exit_net(struct net *net)
7363 {
7364         int i;
7365
7366 #ifdef CONFIG_SYSCTL
7367         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7368                                      NETCONFA_IFINDEX_DEFAULT);
7369         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7370                                      NETCONFA_IFINDEX_ALL);
7371 #endif
7372         kfree(net->ipv6.devconf_dflt);
7373         net->ipv6.devconf_dflt = NULL;
7374         kfree(net->ipv6.devconf_all);
7375         net->ipv6.devconf_all = NULL;
7376
7377         cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7378         /*
7379          *      Check hash table, then free it.
7380          */
7381         for (i = 0; i < IN6_ADDR_HSIZE; i++)
7382                 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7383
7384         kfree(net->ipv6.inet6_addr_lst);
7385         net->ipv6.inet6_addr_lst = NULL;
7386 }
7387
7388 static struct pernet_operations addrconf_ops = {
7389         .init = addrconf_init_net,
7390         .exit = addrconf_exit_net,
7391 };
7392
7393 static struct rtnl_af_ops inet6_ops __read_mostly = {
7394         .family           = AF_INET6,
7395         .fill_link_af     = inet6_fill_link_af,
7396         .get_link_af_size = inet6_get_link_af_size,
7397         .validate_link_af = inet6_validate_link_af,
7398         .set_link_af      = inet6_set_link_af,
7399 };
7400
7401 /*
7402  *      Init / cleanup code
7403  */
7404
7405 int __init addrconf_init(void)
7406 {
7407         struct inet6_dev *idev;
7408         int err;
7409
7410         err = ipv6_addr_label_init();
7411         if (err < 0) {
7412                 pr_crit("%s: cannot initialize default policy table: %d\n",
7413                         __func__, err);
7414                 goto out;
7415         }
7416
7417         err = register_pernet_subsys(&addrconf_ops);
7418         if (err < 0)
7419                 goto out_addrlabel;
7420
7421         /* All works using addrconf_wq need to lock rtnl. */
7422         addrconf_wq = create_singlethread_workqueue("ipv6_addrconf");
7423         if (!addrconf_wq) {
7424                 err = -ENOMEM;
7425                 goto out_nowq;
7426         }
7427
7428         rtnl_lock();
7429         idev = ipv6_add_dev(blackhole_netdev);
7430         rtnl_unlock();
7431         if (IS_ERR(idev)) {
7432                 err = PTR_ERR(idev);
7433                 goto errlo;
7434         }
7435
7436         ip6_route_init_special_entries();
7437
7438         register_netdevice_notifier(&ipv6_dev_notf);
7439
7440         addrconf_verify(&init_net);
7441
7442         rtnl_af_register(&inet6_ops);
7443
7444         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7445                                    NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED);
7446         if (err < 0)
7447                 goto errout;
7448
7449         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7450                                    inet6_rtm_newaddr, NULL, 0);
7451         if (err < 0)
7452                 goto errout;
7453         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7454                                    inet6_rtm_deladdr, NULL, 0);
7455         if (err < 0)
7456                 goto errout;
7457         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7458                                    inet6_rtm_getaddr, inet6_dump_ifaddr,
7459                                    RTNL_FLAG_DOIT_UNLOCKED |
7460                                    RTNL_FLAG_DUMP_UNLOCKED);
7461         if (err < 0)
7462                 goto errout;
7463         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7464                                    NULL, inet6_dump_ifmcaddr,
7465                                    RTNL_FLAG_DUMP_UNLOCKED);
7466         if (err < 0)
7467                 goto errout;
7468         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7469                                    NULL, inet6_dump_ifacaddr,
7470                                    RTNL_FLAG_DUMP_UNLOCKED);
7471         if (err < 0)
7472                 goto errout;
7473         err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7474                                    inet6_netconf_get_devconf,
7475                                    inet6_netconf_dump_devconf,
7476                                    RTNL_FLAG_DOIT_UNLOCKED |
7477                                    RTNL_FLAG_DUMP_UNLOCKED);
7478         if (err < 0)
7479                 goto errout;
7480         err = ipv6_addr_label_rtnl_register();
7481         if (err < 0)
7482                 goto errout;
7483
7484         return 0;
7485 errout:
7486         rtnl_unregister_all(PF_INET6);
7487         rtnl_af_unregister(&inet6_ops);
7488         unregister_netdevice_notifier(&ipv6_dev_notf);
7489 errlo:
7490         destroy_workqueue(addrconf_wq);
7491 out_nowq:
7492         unregister_pernet_subsys(&addrconf_ops);
7493 out_addrlabel:
7494         ipv6_addr_label_cleanup();
7495 out:
7496         return err;
7497 }
7498
7499 void addrconf_cleanup(void)
7500 {
7501         struct net_device *dev;
7502
7503         unregister_netdevice_notifier(&ipv6_dev_notf);
7504         unregister_pernet_subsys(&addrconf_ops);
7505         ipv6_addr_label_cleanup();
7506
7507         rtnl_af_unregister(&inet6_ops);
7508
7509         rtnl_lock();
7510
7511         /* clean dev list */
7512         for_each_netdev(&init_net, dev) {
7513                 if (__in6_dev_get(dev) == NULL)
7514                         continue;
7515                 addrconf_ifdown(dev, true);
7516         }
7517         addrconf_ifdown(init_net.loopback_dev, true);
7518
7519         rtnl_unlock();
7520
7521         destroy_workqueue(addrconf_wq);
7522 }