net/ipv6/addrconf.c

   1 /*
   2  *      IPv6 Address [auto]configuration
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  *      Changes:
  17  *
  18  *      Janos Farkas                    :       delete timer on ifdown
  19  *      <chexum@bankinf.banki.hu>
  20  *      Andi Kleen                      :       kill double kfree on module
  21  *                                              unload.
  22  *      Maciej W. Rozycki               :       FDDI support
  23  *      sekiya@USAGI                    :       Don't send too many RS
  24  *                                              packets.
  25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
  26  *                                              packets.
  27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
  28  *                                              address validation timer.
  29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
  30  *                                              support.
  31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
  32  *                                              address on a same interface.
  33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
  34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
  35  *                                              seq_file.
  36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
  37  *                                              selection; consider scope,
  38  *                                              status etc.
  39  */
  40
  41 #define pr_fmt(fmt) "IPv6: " fmt
  42
  43 #include <linux/errno.h>
  44 #include <linux/types.h>
  45 #include <linux/kernel.h>
  46 #include <linux/socket.h>
  47 #include <linux/sockios.h>
  48 #include <linux/net.h>
  49 #include <linux/inet.h>
  50 #include <linux/in6.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/if_addr.h>
  53 #include <linux/if_arp.h>
  54 #include <linux/if_arcnet.h>
  55 #include <linux/if_infiniband.h>
  56 #include <linux/route.h>
  57 #include <linux/inetdevice.h>
  58 #include <linux/init.h>
  59 #include <linux/slab.h>
  60 #ifdef CONFIG_SYSCTL
  61 #include <linux/sysctl.h>
  62 #endif
  63 #include <linux/capability.h>
  64 #include <linux/delay.h>
  65 #include <linux/notifier.h>
  66 #include <linux/string.h>
  67 #include <linux/hash.h>
  68
  69 #include <net/net_namespace.h>
  70 #include <net/sock.h>
  71 #include <net/snmp.h>
  72
  73 #include <net/af_ieee802154.h>
  74 #include <net/firewire.h>
  75 #include <net/ipv6.h>
  76 #include <net/protocol.h>
  77 #include <net/ndisc.h>
  78 #include <net/ip6_route.h>
  79 #include <net/addrconf.h>
  80 #include <net/tcp.h>
  81 #include <net/ip.h>
  82 #include <net/netlink.h>
  83 #include <net/pkt_sched.h>
  84 #include <net/l3mdev.h>
  85 #include <linux/if_tunnel.h>
  86 #include <linux/rtnetlink.h>
  87 #include <linux/netconf.h>
  88 #include <linux/random.h>
  89 #include <linux/uaccess.h>
  90 #include <asm/unaligned.h>
  91
  92 #include <linux/proc_fs.h>
  93 #include <linux/seq_file.h>
  94 #include <linux/export.h>
  95
  96 /* Set to 3 to get tracing... */
  97 #define ACONF_DEBUG 2
  98
  99 #if ACONF_DEBUG >= 3
 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
 101 #else
 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 103 #endif
 104
 105 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 106
 107 #define IPV6_MAX_STRLEN \
 108         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
 109
 110 static inline u32 cstamp_delta(unsigned long cstamp)
 111 {
 112         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 113 }
 114
 115 #ifdef CONFIG_SYSCTL
 116 static int addrconf_sysctl_register(struct inet6_dev *idev);
 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 118 #else
 119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
 120 {
 121         return 0;
 122 }
 123
 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 125 {
 126 }
 127 #endif
 128
 129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 131 static void ipv6_regen_rndid(unsigned long data);
 132
 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 134 static int ipv6_count_addresses(struct inet6_dev *idev);
 135 static int ipv6_generate_stable_address(struct in6_addr *addr,
 136                                         u8 dad_count,
 137                                         const struct inet6_dev *idev);
 138
 139 /*
 140  *      Configured unicast address hash table
 141  */
 142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 143 static DEFINE_SPINLOCK(addrconf_hash_lock);
 144
 145 static void addrconf_verify(void);
 146 static void addrconf_verify_rtnl(void);
 147 static void addrconf_verify_work(struct work_struct *);
 148
 149 static struct workqueue_struct *addrconf_wq;
 150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 151
 152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 154
 155 static void addrconf_type_change(struct net_device *dev,
 156                                  unsigned long event);
 157 static int addrconf_ifdown(struct net_device *dev, int how);
 158
 159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 160                                                   int plen,
 161                                                   const struct net_device *dev,
 162                                                   u32 flags, u32 noflags);
 163
 164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 165 static void addrconf_dad_work(struct work_struct *w);
 166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 167 static void addrconf_dad_run(struct inet6_dev *idev);
 168 static void addrconf_rs_timer(unsigned long data);
 169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 171
 172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 173                                 struct prefix_info *pinfo);
 174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 175                                struct net_device *dev);
 176
 177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 178         .forwarding             = 0,
 179         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 180         .mtu6                   = IPV6_MIN_MTU,
 181         .accept_ra              = 1,
 182         .accept_redirects       = 1,
 183         .autoconf               = 1,
 184         .force_mld_version      = 0,
 185         .mldv1_unsolicited_report_interval = 10 * HZ,
 186         .mldv2_unsolicited_report_interval = HZ,
 187         .dad_transmits          = 1,
 188         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 189         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 190         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 191         .use_tempaddr           = 0,
 192         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 193         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 194         .regen_max_retry        = REGEN_MAX_RETRY,
 195         .max_desync_factor      = MAX_DESYNC_FACTOR,
 196         .max_addresses          = IPV6_MAX_ADDRESSES,
 197         .accept_ra_defrtr       = 1,
 198         .accept_ra_from_local   = 0,
 199         .accept_ra_min_hop_limit= 1,
 200         .accept_ra_pinfo        = 1,
 201 #ifdef CONFIG_IPV6_ROUTER_PREF
 202         .accept_ra_rtr_pref     = 1,
 203         .rtr_probe_interval     = 60 * HZ,
 204 #ifdef CONFIG_IPV6_ROUTE_INFO
 205         .accept_ra_rt_info_max_plen = 0,
 206 #endif
 207 #endif
 208         .accept_ra_rt_table     = 0,
 209         .proxy_ndp              = 0,
 210         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 211         .disable_ipv6           = 0,
 212         .accept_dad             = 1,
 213         .suppress_frag_ndisc    = 1,
 214         .accept_ra_mtu          = 1,
 215         .stable_secret          = {
 216                 .initialized = false,
 217         },
 218         .use_oif_addrs_only     = 0,
 219         .ignore_routes_with_linkdown = 0,
 220 };
 221
 222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 223         .forwarding             = 0,
 224         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 225         .mtu6                   = IPV6_MIN_MTU,
 226         .accept_ra              = 1,
 227         .accept_redirects       = 1,
 228         .autoconf               = 1,
 229         .force_mld_version      = 0,
 230         .mldv1_unsolicited_report_interval = 10 * HZ,
 231         .mldv2_unsolicited_report_interval = HZ,
 232         .dad_transmits          = 1,
 233         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 234         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 235         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 236         .use_tempaddr           = 0,
 237         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 238         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 239         .regen_max_retry        = REGEN_MAX_RETRY,
 240         .max_desync_factor      = MAX_DESYNC_FACTOR,
 241         .max_addresses          = IPV6_MAX_ADDRESSES,
 242         .accept_ra_defrtr       = 1,
 243         .accept_ra_from_local   = 0,
 244         .accept_ra_min_hop_limit= 1,
 245         .accept_ra_pinfo        = 1,
 246 #ifdef CONFIG_IPV6_ROUTER_PREF
 247         .accept_ra_rtr_pref     = 1,
 248         .rtr_probe_interval     = 60 * HZ,
 249 #ifdef CONFIG_IPV6_ROUTE_INFO
 250         .accept_ra_rt_info_max_plen = 0,
 251 #endif
 252 #endif
 253         .accept_ra_rt_table     = 0,
 254         .proxy_ndp              = 0,
 255         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 256         .disable_ipv6           = 0,
 257         .accept_dad             = 1,
 258         .suppress_frag_ndisc    = 1,
 259         .accept_ra_mtu          = 1,
 260         .stable_secret          = {
 261                 .initialized = false,
 262         },
 263         .use_oif_addrs_only     = 0,
 264         .ignore_routes_with_linkdown = 0,
 265 };
 266
 267 /* Check if a valid qdisc is available */
 268 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 269 {
 270         return !qdisc_tx_is_noop(dev);
 271 }
 272
 273 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 274 {
 275         if (del_timer(&idev->rs_timer))
 276                 __in6_dev_put(idev);
 277 }
 278
 279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 280 {
 281         if (cancel_delayed_work(&ifp->dad_work))
 282                 __in6_ifa_put(ifp);
 283 }
 284
 285 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 286                                   unsigned long when)
 287 {
 288         if (!timer_pending(&idev->rs_timer))
 289                 in6_dev_hold(idev);
 290         mod_timer(&idev->rs_timer, jiffies + when);
 291 }
 292
 293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 294                                    unsigned long delay)
 295 {
 296         if (!delayed_work_pending(&ifp->dad_work))
 297                 in6_ifa_hold(ifp);
 298         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 299 }
 300
 301 static int snmp6_alloc_dev(struct inet6_dev *idev)
 302 {
 303         int i;
 304
 305         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
 306         if (!idev->stats.ipv6)
 307                 goto err_ip;
 308
 309         for_each_possible_cpu(i) {
 310                 struct ipstats_mib *addrconf_stats;
 311                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
 312                 u64_stats_init(&addrconf_stats->syncp);
 313         }
 314
 315
 316         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 317                                         GFP_KERNEL);
 318         if (!idev->stats.icmpv6dev)
 319                 goto err_icmp;
 320         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 321                                            GFP_KERNEL);
 322         if (!idev->stats.icmpv6msgdev)
 323                 goto err_icmpmsg;
 324
 325         return 0;
 326
 327 err_icmpmsg:
 328         kfree(idev->stats.icmpv6dev);
 329 err_icmp:
 330         free_percpu(idev->stats.ipv6);
 331 err_ip:
 332         return -ENOMEM;
 333 }
 334
 335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 336 {
 337         struct inet6_dev *ndev;
 338         int err = -ENOMEM;
 339
 340         ASSERT_RTNL();
 341
 342         if (dev->mtu < IPV6_MIN_MTU)
 343                 return ERR_PTR(-EINVAL);
 344
 345         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 346         if (!ndev)
 347                 return ERR_PTR(err);
 348
 349         rwlock_init(&ndev->lock);
 350         ndev->dev = dev;
 351         INIT_LIST_HEAD(&ndev->addr_list);
 352         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 353                     (unsigned long)ndev);
 354         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 355
 356         if (ndev->cnf.stable_secret.initialized)
 357                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
 358         else
 359                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
 360
 361         ndev->cnf.mtu6 = dev->mtu;
 362         ndev->cnf.sysctl = NULL;
 363         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 364         if (!ndev->nd_parms) {
 365                 kfree(ndev);
 366                 return ERR_PTR(err);
 367         }
 368         if (ndev->cnf.forwarding)
 369                 dev_disable_lro(dev);
 370         /* We refer to the device */
 371         dev_hold(dev);
 372
 373         if (snmp6_alloc_dev(ndev) < 0) {
 374                 ADBG(KERN_WARNING
 375                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 376                         __func__, dev->name);
 377                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 378                 dev_put(dev);
 379                 kfree(ndev);
 380                 return ERR_PTR(err);
 381         }
 382
 383         if (snmp6_register_dev(ndev) < 0) {
 384                 ADBG(KERN_WARNING
 385                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 386                         __func__, dev->name);
 387                 goto err_release;
 388         }
 389
 390         /* One reference from device.  We must do this before
 391          * we invoke __ipv6_regen_rndid().
 392          */
 393         in6_dev_hold(ndev);
 394
 395         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 396                 ndev->cnf.accept_dad = -1;
 397
 398 #if IS_ENABLED(CONFIG_IPV6_SIT)
 399         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 400                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 401                 ndev->cnf.rtr_solicits = 0;
 402         }
 403 #endif
 404
 405         INIT_LIST_HEAD(&ndev->tempaddr_list);
 406         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 407         if ((dev->flags&IFF_LOOPBACK) ||
 408             dev->type == ARPHRD_TUNNEL ||
 409             dev->type == ARPHRD_TUNNEL6 ||
 410             dev->type == ARPHRD_SIT ||
 411             dev->type == ARPHRD_NONE) {
 412                 ndev->cnf.use_tempaddr = -1;
 413         } else {
 414                 in6_dev_hold(ndev);
 415                 ipv6_regen_rndid((unsigned long) ndev);
 416         }
 417
 418         ndev->token = in6addr_any;
 419
 420         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 421                 ndev->if_flags |= IF_READY;
 422
 423         ipv6_mc_init_dev(ndev);
 424         ndev->tstamp = jiffies;
 425         err = addrconf_sysctl_register(ndev);
 426         if (err) {
 427                 ipv6_mc_destroy_dev(ndev);
 428                 del_timer(&ndev->regen_timer);
 429                 snmp6_unregister_dev(ndev);
 430                 goto err_release;
 431         }
 432         /* protected by rtnl_lock */
 433         rcu_assign_pointer(dev->ip6_ptr, ndev);
 434
 435         /* Join interface-local all-node multicast group */
 436         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 437
 438         /* Join all-node multicast group */
 439         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 440
 441         /* Join all-router multicast group if forwarding is set */
 442         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 443                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 444
 445         return ndev;
 446
 447 err_release:
 448         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 449         ndev->dead = 1;
 450         in6_dev_finish_destroy(ndev);
 451         return ERR_PTR(err);
 452 }
 453
 454 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 455 {
 456         struct inet6_dev *idev;
 457
 458         ASSERT_RTNL();
 459
 460         idev = __in6_dev_get(dev);
 461         if (!idev) {
 462                 idev = ipv6_add_dev(dev);
 463                 if (IS_ERR(idev))
 464                         return NULL;
 465         }
 466
 467         if (dev->flags&IFF_UP)
 468                 ipv6_mc_up(idev);
 469         return idev;
 470 }
 471
 472 static int inet6_netconf_msgsize_devconf(int type)
 473 {
 474         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 475                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 476
 477         /* type -1 is used for ALL */
 478         if (type == -1 || type == NETCONFA_FORWARDING)
 479                 size += nla_total_size(4);
 480 #ifdef CONFIG_IPV6_MROUTE
 481         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 482                 size += nla_total_size(4);
 483 #endif
 484         if (type == -1 || type == NETCONFA_PROXY_NEIGH)
 485                 size += nla_total_size(4);
 486
 487         if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 488                 size += nla_total_size(4);
 489
 490         return size;
 491 }
 492
 493 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 494                                       struct ipv6_devconf *devconf, u32 portid,
 495                                       u32 seq, int event, unsigned int flags,
 496                                       int type)
 497 {
 498         struct nlmsghdr  *nlh;
 499         struct netconfmsg *ncm;
 500
 501         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 502                         flags);
 503         if (!nlh)
 504                 return -EMSGSIZE;
 505
 506         ncm = nlmsg_data(nlh);
 507         ncm->ncm_family = AF_INET6;
 508
 509         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 510                 goto nla_put_failure;
 511
 512         /* type -1 is used for ALL */
 513         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 514             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 515                 goto nla_put_failure;
 516 #ifdef CONFIG_IPV6_MROUTE
 517         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 518             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 519                         devconf->mc_forwarding) < 0)
 520                 goto nla_put_failure;
 521 #endif
 522         if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
 523             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 524                 goto nla_put_failure;
 525
 526         if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 527             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 528                         devconf->ignore_routes_with_linkdown) < 0)
 529                 goto nla_put_failure;
 530
 531         nlmsg_end(skb, nlh);
 532         return 0;
 533
 534 nla_put_failure:
 535         nlmsg_cancel(skb, nlh);
 536         return -EMSGSIZE;
 537 }
 538
 539 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 540                                   struct ipv6_devconf *devconf)
 541 {
 542         struct sk_buff *skb;
 543         int err = -ENOBUFS;
 544
 545         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 546         if (!skb)
 547                 goto errout;
 548
 549         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 550                                          RTM_NEWNETCONF, 0, type);
 551         if (err < 0) {
 552                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 553                 WARN_ON(err == -EMSGSIZE);
 554                 kfree_skb(skb);
 555                 goto errout;
 556         }
 557         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 558         return;
 559 errout:
 560         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 561 }
 562
 563 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 564         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 565         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 566         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 567         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 568 };
 569
 570 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 571                                      struct nlmsghdr *nlh)
 572 {
 573         struct net *net = sock_net(in_skb->sk);
 574         struct nlattr *tb[NETCONFA_MAX+1];
 575         struct netconfmsg *ncm;
 576         struct sk_buff *skb;
 577         struct ipv6_devconf *devconf;
 578         struct inet6_dev *in6_dev;
 579         struct net_device *dev;
 580         int ifindex;
 581         int err;
 582
 583         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 584                           devconf_ipv6_policy);
 585         if (err < 0)
 586                 goto errout;
 587
 588         err = -EINVAL;
 589         if (!tb[NETCONFA_IFINDEX])
 590                 goto errout;
 591
 592         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 593         switch (ifindex) {
 594         case NETCONFA_IFINDEX_ALL:
 595                 devconf = net->ipv6.devconf_all;
 596                 break;
 597         case NETCONFA_IFINDEX_DEFAULT:
 598                 devconf = net->ipv6.devconf_dflt;
 599                 break;
 600         default:
 601                 dev = __dev_get_by_index(net, ifindex);
 602                 if (!dev)
 603                         goto errout;
 604                 in6_dev = __in6_dev_get(dev);
 605                 if (!in6_dev)
 606                         goto errout;
 607                 devconf = &in6_dev->cnf;
 608                 break;
 609         }
 610
 611         err = -ENOBUFS;
 612         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 613         if (!skb)
 614                 goto errout;
 615
 616         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 617                                          NETLINK_CB(in_skb).portid,
 618                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 619                                          -1);
 620         if (err < 0) {
 621                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 622                 WARN_ON(err == -EMSGSIZE);
 623                 kfree_skb(skb);
 624                 goto errout;
 625         }
 626         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 627 errout:
 628         return err;
 629 }
 630
 631 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 632                                       struct netlink_callback *cb)
 633 {
 634         struct net *net = sock_net(skb->sk);
 635         int h, s_h;
 636         int idx, s_idx;
 637         struct net_device *dev;
 638         struct inet6_dev *idev;
 639         struct hlist_head *head;
 640
 641         s_h = cb->args[0];
 642         s_idx = idx = cb->args[1];
 643
 644         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 645                 idx = 0;
 646                 head = &net->dev_index_head[h];
 647                 rcu_read_lock();
 648                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 649                           net->dev_base_seq;
 650                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 651                         if (idx < s_idx)
 652                                 goto cont;
 653                         idev = __in6_dev_get(dev);
 654                         if (!idev)
 655                                 goto cont;
 656
 657                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 658                                                        &idev->cnf,
 659                                                        NETLINK_CB(cb->skb).portid,
 660                                                        cb->nlh->nlmsg_seq,
 661                                                        RTM_NEWNETCONF,
 662                                                        NLM_F_MULTI,
 663                                                        -1) < 0) {
 664                                 rcu_read_unlock();
 665                                 goto done;
 666                         }
 667                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 668 cont:
 669                         idx++;
 670                 }
 671                 rcu_read_unlock();
 672         }
 673         if (h == NETDEV_HASHENTRIES) {
 674                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 675                                                net->ipv6.devconf_all,
 676                                                NETLINK_CB(cb->skb).portid,
 677                                                cb->nlh->nlmsg_seq,
 678                                                RTM_NEWNETCONF, NLM_F_MULTI,
 679                                                -1) < 0)
 680                         goto done;
 681                 else
 682                         h++;
 683         }
 684         if (h == NETDEV_HASHENTRIES + 1) {
 685                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 686                                                net->ipv6.devconf_dflt,
 687                                                NETLINK_CB(cb->skb).portid,
 688                                                cb->nlh->nlmsg_seq,
 689                                                RTM_NEWNETCONF, NLM_F_MULTI,
 690                                                -1) < 0)
 691                         goto done;
 692                 else
 693                         h++;
 694         }
 695 done:
 696         cb->args[0] = h;
 697         cb->args[1] = idx;
 698
 699         return skb->len;
 700 }
 701
 702 #ifdef CONFIG_SYSCTL
 703 static void dev_forward_change(struct inet6_dev *idev)
 704 {
 705         struct net_device *dev;
 706         struct inet6_ifaddr *ifa;
 707
 708         if (!idev)
 709                 return;
 710         dev = idev->dev;
 711         if (idev->cnf.forwarding)
 712                 dev_disable_lro(dev);
 713         if (dev->flags & IFF_MULTICAST) {
 714                 if (idev->cnf.forwarding) {
 715                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 716                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 717                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 718                 } else {
 719                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 720                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 721                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 722                 }
 723         }
 724
 725         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 726                 if (ifa->flags&IFA_F_TENTATIVE)
 727                         continue;
 728                 if (idev->cnf.forwarding)
 729                         addrconf_join_anycast(ifa);
 730                 else
 731                         addrconf_leave_anycast(ifa);
 732         }
 733         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 734                                      dev->ifindex, &idev->cnf);
 735 }
 736
 737
 738 static void addrconf_forward_change(struct net *net, __s32 newf)
 739 {
 740         struct net_device *dev;
 741         struct inet6_dev *idev;
 742
 743         for_each_netdev(net, dev) {
 744                 idev = __in6_dev_get(dev);
 745                 if (idev) {
 746                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 747                         idev->cnf.forwarding = newf;
 748                         if (changed)
 749                                 dev_forward_change(idev);
 750                 }
 751         }
 752 }
 753
 754 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 755 {
 756         struct net *net;
 757         int old;
 758
 759         if (!rtnl_trylock())
 760                 return restart_syscall();
 761
 762         net = (struct net *)table->extra2;
 763         old = *p;
 764         *p = newf;
 765
 766         if (p == &net->ipv6.devconf_dflt->forwarding) {
 767                 if ((!newf) ^ (!old))
 768                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 769                                                      NETCONFA_IFINDEX_DEFAULT,
 770                                                      net->ipv6.devconf_dflt);
 771                 rtnl_unlock();
 772                 return 0;
 773         }
 774
 775         if (p == &net->ipv6.devconf_all->forwarding) {
 776                 net->ipv6.devconf_dflt->forwarding = newf;
 777                 addrconf_forward_change(net, newf);
 778                 if ((!newf) ^ (!old))
 779                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 780                                                      NETCONFA_IFINDEX_ALL,
 781                                                      net->ipv6.devconf_all);
 782         } else if ((!newf) ^ (!old))
 783                 dev_forward_change((struct inet6_dev *)table->extra1);
 784         rtnl_unlock();
 785
 786         if (newf)
 787                 rt6_purge_dflt_routers(net);
 788         return 1;
 789 }
 790
 791 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 792 {
 793         struct net_device *dev;
 794         struct inet6_dev *idev;
 795
 796         for_each_netdev(net, dev) {
 797                 idev = __in6_dev_get(dev);
 798                 if (idev) {
 799                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 800
 801                         idev->cnf.ignore_routes_with_linkdown = newf;
 802                         if (changed)
 803                                 inet6_netconf_notify_devconf(dev_net(dev),
 804                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 805                                                              dev->ifindex,
 806                                                              &idev->cnf);
 807                 }
 808         }
 809 }
 810
 811 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 812 {
 813         struct net *net;
 814         int old;
 815
 816         if (!rtnl_trylock())
 817                 return restart_syscall();
 818
 819         net = (struct net *)table->extra2;
 820         old = *p;
 821         *p = newf;
 822
 823         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 824                 if ((!newf) ^ (!old))
 825                         inet6_netconf_notify_devconf(net,
 826                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 827                                                      NETCONFA_IFINDEX_DEFAULT,
 828                                                      net->ipv6.devconf_dflt);
 829                 rtnl_unlock();
 830                 return 0;
 831         }
 832
 833         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 834                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 835                 addrconf_linkdown_change(net, newf);
 836                 if ((!newf) ^ (!old))
 837                         inet6_netconf_notify_devconf(net,
 838                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 839                                                      NETCONFA_IFINDEX_ALL,
 840                                                      net->ipv6.devconf_all);
 841         }
 842         rtnl_unlock();
 843
 844         return 1;
 845 }
 846
 847 #endif
 848
 849 /* Nobody refers to this ifaddr, destroy it */
 850 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 851 {
 852         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 853
 854 #ifdef NET_REFCNT_DEBUG
 855         pr_debug("%s\n", __func__);
 856 #endif
 857
 858         in6_dev_put(ifp->idev);
 859
 860         if (cancel_delayed_work(&ifp->dad_work))
 861                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 862                           ifp);
 863
 864         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 865                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 866                 return;
 867         }
 868         ip6_rt_put(ifp->rt);
 869
 870         kfree_rcu(ifp, rcu);
 871 }
 872
 873 static void
 874 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 875 {
 876         struct list_head *p;
 877         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 878
 879         /*
 880          * Each device address list is sorted in order of scope -
 881          * global before linklocal.
 882          */
 883         list_for_each(p, &idev->addr_list) {
 884                 struct inet6_ifaddr *ifa
 885                         = list_entry(p, struct inet6_ifaddr, if_list);
 886                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 887                         break;
 888         }
 889
 890         list_add_tail(&ifp->if_list, p);
 891 }
 892
 893 static u32 inet6_addr_hash(const struct in6_addr *addr)
 894 {
 895         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 896 }
 897
 898 /* On success it returns ifp with increased reference count */
 899
 900 static struct inet6_ifaddr *
 901 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 902               const struct in6_addr *peer_addr, int pfxlen,
 903               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 904 {
 905         struct inet6_ifaddr *ifa = NULL;
 906         struct rt6_info *rt;
 907         unsigned int hash;
 908         int err = 0;
 909         int addr_type = ipv6_addr_type(addr);
 910
 911         if (addr_type == IPV6_ADDR_ANY ||
 912             addr_type & IPV6_ADDR_MULTICAST ||
 913             (!(idev->dev->flags & IFF_LOOPBACK) &&
 914              addr_type & IPV6_ADDR_LOOPBACK))
 915                 return ERR_PTR(-EADDRNOTAVAIL);
 916
 917         rcu_read_lock_bh();
 918         if (idev->dead) {
 919                 err = -ENODEV;                  /*XXX*/
 920                 goto out2;
 921         }
 922
 923         if (idev->cnf.disable_ipv6) {
 924                 err = -EACCES;
 925                 goto out2;
 926         }
 927
 928         spin_lock(&addrconf_hash_lock);
 929
 930         /* Ignore adding duplicate addresses on an interface */
 931         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 932                 ADBG("ipv6_add_addr: already assigned\n");
 933                 err = -EEXIST;
 934                 goto out;
 935         }
 936
 937         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 938
 939         if (!ifa) {
 940                 ADBG("ipv6_add_addr: malloc failed\n");
 941                 err = -ENOBUFS;
 942                 goto out;
 943         }
 944
 945         rt = addrconf_dst_alloc(idev, addr, false);
 946         if (IS_ERR(rt)) {
 947                 err = PTR_ERR(rt);
 948                 goto out;
 949         }
 950
 951         neigh_parms_data_state_setall(idev->nd_parms);
 952
 953         ifa->addr = *addr;
 954         if (peer_addr)
 955                 ifa->peer_addr = *peer_addr;
 956
 957         spin_lock_init(&ifa->lock);
 958         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 959         INIT_HLIST_NODE(&ifa->addr_lst);
 960         ifa->scope = scope;
 961         ifa->prefix_len = pfxlen;
 962         ifa->flags = flags | IFA_F_TENTATIVE;
 963         ifa->valid_lft = valid_lft;
 964         ifa->prefered_lft = prefered_lft;
 965         ifa->cstamp = ifa->tstamp = jiffies;
 966         ifa->tokenized = false;
 967
 968         ifa->rt = rt;
 969
 970         ifa->idev = idev;
 971         in6_dev_hold(idev);
 972         /* For caller */
 973         in6_ifa_hold(ifa);
 974
 975         /* Add to big hash table */
 976         hash = inet6_addr_hash(addr);
 977
 978         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 979         spin_unlock(&addrconf_hash_lock);
 980
 981         write_lock(&idev->lock);
 982         /* Add to inet6_dev unicast addr list. */
 983         ipv6_link_dev_addr(idev, ifa);
 984
 985         if (ifa->flags&IFA_F_TEMPORARY) {
 986                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 987                 in6_ifa_hold(ifa);
 988         }
 989
 990         in6_ifa_hold(ifa);
 991         write_unlock(&idev->lock);
 992 out2:
 993         rcu_read_unlock_bh();
 994
 995         if (likely(err == 0))
 996                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 997         else {
 998                 kfree(ifa);
 999                 ifa = ERR_PTR(err);
1000         }
1001
1002         return ifa;
1003 out:
1004         spin_unlock(&addrconf_hash_lock);
1005         goto out2;
1006 }
1007
1008 enum cleanup_prefix_rt_t {
1009         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1010         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1011         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1012 };
1013
1014 /*
1015  * Check, whether the prefix for ifp would still need a prefix route
1016  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1017  * constants.
1018  *
1019  * 1) we don't purge prefix if address was not permanent.
1020  *    prefix is managed by its own lifetime.
1021  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1022  * 3) if there are no addresses, delete prefix.
1023  * 4) if there are still other permanent address(es),
1024  *    corresponding prefix is still permanent.
1025  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1026  *    don't purge the prefix, assume user space is managing it.
1027  * 6) otherwise, update prefix lifetime to the
1028  *    longest valid lifetime among the corresponding
1029  *    addresses on the device.
1030  *    Note: subsequent RA will update lifetime.
1031  **/
1032 static enum cleanup_prefix_rt_t
1033 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1034 {
1035         struct inet6_ifaddr *ifa;
1036         struct inet6_dev *idev = ifp->idev;
1037         unsigned long lifetime;
1038         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1039
1040         *expires = jiffies;
1041
1042         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1043                 if (ifa == ifp)
1044                         continue;
1045                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1046                                        ifp->prefix_len))
1047                         continue;
1048                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1049                         return CLEANUP_PREFIX_RT_NOP;
1050
1051                 action = CLEANUP_PREFIX_RT_EXPIRE;
1052
1053                 spin_lock(&ifa->lock);
1054
1055                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1056                 /*
1057                  * Note: Because this address is
1058                  * not permanent, lifetime <
1059                  * LONG_MAX / HZ here.
1060                  */
1061                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1062                         *expires = ifa->tstamp + lifetime * HZ;
1063                 spin_unlock(&ifa->lock);
1064         }
1065
1066         return action;
1067 }
1068
1069 static void
1070 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1071 {
1072         struct rt6_info *rt;
1073
1074         rt = addrconf_get_prefix_route(&ifp->addr,
1075                                        ifp->prefix_len,
1076                                        ifp->idev->dev,
1077                                        0, RTF_GATEWAY | RTF_DEFAULT);
1078         if (rt) {
1079                 if (del_rt)
1080                         ip6_del_rt(rt);
1081                 else {
1082                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1083                                 rt6_set_expires(rt, expires);
1084                         ip6_rt_put(rt);
1085                 }
1086         }
1087 }
1088
1089
1090 /* This function wants to get referenced ifp and releases it before return */
1091
1092 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1093 {
1094         int state;
1095         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1096         unsigned long expires;
1097
1098         ASSERT_RTNL();
1099
1100         spin_lock_bh(&ifp->lock);
1101         state = ifp->state;
1102         ifp->state = INET6_IFADDR_STATE_DEAD;
1103         spin_unlock_bh(&ifp->lock);
1104
1105         if (state == INET6_IFADDR_STATE_DEAD)
1106                 goto out;
1107
1108         spin_lock_bh(&addrconf_hash_lock);
1109         hlist_del_init_rcu(&ifp->addr_lst);
1110         spin_unlock_bh(&addrconf_hash_lock);
1111
1112         write_lock_bh(&ifp->idev->lock);
1113
1114         if (ifp->flags&IFA_F_TEMPORARY) {
1115                 list_del(&ifp->tmp_list);
1116                 if (ifp->ifpub) {
1117                         in6_ifa_put(ifp->ifpub);
1118                         ifp->ifpub = NULL;
1119                 }
1120                 __in6_ifa_put(ifp);
1121         }
1122
1123         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1124                 action = check_cleanup_prefix_route(ifp, &expires);
1125
1126         list_del_init(&ifp->if_list);
1127         __in6_ifa_put(ifp);
1128
1129         write_unlock_bh(&ifp->idev->lock);
1130
1131         addrconf_del_dad_work(ifp);
1132
1133         ipv6_ifa_notify(RTM_DELADDR, ifp);
1134
1135         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1136
1137         if (action != CLEANUP_PREFIX_RT_NOP) {
1138                 cleanup_prefix_route(ifp, expires,
1139                         action == CLEANUP_PREFIX_RT_DEL);
1140         }
1141
1142         /* clean up prefsrc entries */
1143         rt6_remove_prefsrc(ifp);
1144 out:
1145         in6_ifa_put(ifp);
1146 }
1147
1148 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1149 {
1150         struct inet6_dev *idev = ifp->idev;
1151         struct in6_addr addr, *tmpaddr;
1152         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1153         unsigned long regen_advance;
1154         int tmp_plen;
1155         int ret = 0;
1156         u32 addr_flags;
1157         unsigned long now = jiffies;
1158
1159         write_lock_bh(&idev->lock);
1160         if (ift) {
1161                 spin_lock_bh(&ift->lock);
1162                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1163                 spin_unlock_bh(&ift->lock);
1164                 tmpaddr = &addr;
1165         } else {
1166                 tmpaddr = NULL;
1167         }
1168 retry:
1169         in6_dev_hold(idev);
1170         if (idev->cnf.use_tempaddr <= 0) {
1171                 write_unlock_bh(&idev->lock);
1172                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1173                 in6_dev_put(idev);
1174                 ret = -1;
1175                 goto out;
1176         }
1177         spin_lock_bh(&ifp->lock);
1178         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1179                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1180                 spin_unlock_bh(&ifp->lock);
1181                 write_unlock_bh(&idev->lock);
1182                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1183                         __func__);
1184                 in6_dev_put(idev);
1185                 ret = -1;
1186                 goto out;
1187         }
1188         in6_ifa_hold(ifp);
1189         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1190         __ipv6_try_regen_rndid(idev, tmpaddr);
1191         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1192         age = (now - ifp->tstamp) / HZ;
1193         tmp_valid_lft = min_t(__u32,
1194                               ifp->valid_lft,
1195                               idev->cnf.temp_valid_lft + age);
1196         tmp_prefered_lft = min_t(__u32,
1197                                  ifp->prefered_lft,
1198                                  idev->cnf.temp_prefered_lft + age -
1199                                  idev->cnf.max_desync_factor);
1200         tmp_plen = ifp->prefix_len;
1201         tmp_tstamp = ifp->tstamp;
1202         spin_unlock_bh(&ifp->lock);
1203
1204         regen_advance = idev->cnf.regen_max_retry *
1205                         idev->cnf.dad_transmits *
1206                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1207         write_unlock_bh(&idev->lock);
1208
1209         /* A temporary address is created only if this calculated Preferred
1210          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1211          * an implementation must not create a temporary address with a zero
1212          * Preferred Lifetime.
1213          * Use age calculation as in addrconf_verify to avoid unnecessary
1214          * temporary addresses being generated.
1215          */
1216         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1217         if (tmp_prefered_lft <= regen_advance + age) {
1218                 in6_ifa_put(ifp);
1219                 in6_dev_put(idev);
1220                 ret = -1;
1221                 goto out;
1222         }
1223
1224         addr_flags = IFA_F_TEMPORARY;
1225         /* set in addrconf_prefix_rcv() */
1226         if (ifp->flags & IFA_F_OPTIMISTIC)
1227                 addr_flags |= IFA_F_OPTIMISTIC;
1228
1229         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1230                             ipv6_addr_scope(&addr), addr_flags,
1231                             tmp_valid_lft, tmp_prefered_lft);
1232         if (IS_ERR(ift)) {
1233                 in6_ifa_put(ifp);
1234                 in6_dev_put(idev);
1235                 pr_info("%s: retry temporary address regeneration\n", __func__);
1236                 tmpaddr = &addr;
1237                 write_lock_bh(&idev->lock);
1238                 goto retry;
1239         }
1240
1241         spin_lock_bh(&ift->lock);
1242         ift->ifpub = ifp;
1243         ift->cstamp = now;
1244         ift->tstamp = tmp_tstamp;
1245         spin_unlock_bh(&ift->lock);
1246
1247         addrconf_dad_start(ift);
1248         in6_ifa_put(ift);
1249         in6_dev_put(idev);
1250 out:
1251         return ret;
1252 }
1253
1254 /*
1255  *      Choose an appropriate source address (RFC3484)
1256  */
1257 enum {
1258         IPV6_SADDR_RULE_INIT = 0,
1259         IPV6_SADDR_RULE_LOCAL,
1260         IPV6_SADDR_RULE_SCOPE,
1261         IPV6_SADDR_RULE_PREFERRED,
1262 #ifdef CONFIG_IPV6_MIP6
1263         IPV6_SADDR_RULE_HOA,
1264 #endif
1265         IPV6_SADDR_RULE_OIF,
1266         IPV6_SADDR_RULE_LABEL,
1267         IPV6_SADDR_RULE_PRIVACY,
1268         IPV6_SADDR_RULE_ORCHID,
1269         IPV6_SADDR_RULE_PREFIX,
1270 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1271         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1272 #endif
1273         IPV6_SADDR_RULE_MAX
1274 };
1275
1276 struct ipv6_saddr_score {
1277         int                     rule;
1278         int                     addr_type;
1279         struct inet6_ifaddr     *ifa;
1280         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1281         int                     scopedist;
1282         int                     matchlen;
1283 };
1284
1285 struct ipv6_saddr_dst {
1286         const struct in6_addr *addr;
1287         int ifindex;
1288         int scope;
1289         int label;
1290         unsigned int prefs;
1291 };
1292
1293 static inline int ipv6_saddr_preferred(int type)
1294 {
1295         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1296                 return 1;
1297         return 0;
1298 }
1299
1300 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1301 {
1302 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1303         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1304 #else
1305         return false;
1306 #endif
1307 }
1308
1309 static int ipv6_get_saddr_eval(struct net *net,
1310                                struct ipv6_saddr_score *score,
1311                                struct ipv6_saddr_dst *dst,
1312                                int i)
1313 {
1314         int ret;
1315
1316         if (i <= score->rule) {
1317                 switch (i) {
1318                 case IPV6_SADDR_RULE_SCOPE:
1319                         ret = score->scopedist;
1320                         break;
1321                 case IPV6_SADDR_RULE_PREFIX:
1322                         ret = score->matchlen;
1323                         break;
1324                 default:
1325                         ret = !!test_bit(i, score->scorebits);
1326                 }
1327                 goto out;
1328         }
1329
1330         switch (i) {
1331         case IPV6_SADDR_RULE_INIT:
1332                 /* Rule 0: remember if hiscore is not ready yet */
1333                 ret = !!score->ifa;
1334                 break;
1335         case IPV6_SADDR_RULE_LOCAL:
1336                 /* Rule 1: Prefer same address */
1337                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1338                 break;
1339         case IPV6_SADDR_RULE_SCOPE:
1340                 /* Rule 2: Prefer appropriate scope
1341                  *
1342                  *      ret
1343                  *       ^
1344                  *    -1 |  d 15
1345                  *    ---+--+-+---> scope
1346                  *       |
1347                  *       |             d is scope of the destination.
1348                  *  B-d  |  \
1349                  *       |   \      <- smaller scope is better if
1350                  *  B-15 |    \        if scope is enough for destination.
1351                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1352                  * d-C-1 | /
1353                  *       |/         <- greater is better
1354                  *   -C  /             if scope is not enough for destination.
1355                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1356                  *
1357                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1358                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1359                  * Assume B = 0 and we get C > 29.
1360                  */
1361                 ret = __ipv6_addr_src_scope(score->addr_type);
1362                 if (ret >= dst->scope)
1363                         ret = -ret;
1364                 else
1365                         ret -= 128;     /* 30 is enough */
1366                 score->scopedist = ret;
1367                 break;
1368         case IPV6_SADDR_RULE_PREFERRED:
1369             {
1370                 /* Rule 3: Avoid deprecated and optimistic addresses */
1371                 u8 avoid = IFA_F_DEPRECATED;
1372
1373                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1374                         avoid |= IFA_F_OPTIMISTIC;
1375                 ret = ipv6_saddr_preferred(score->addr_type) ||
1376                       !(score->ifa->flags & avoid);
1377                 break;
1378             }
1379 #ifdef CONFIG_IPV6_MIP6
1380         case IPV6_SADDR_RULE_HOA:
1381             {
1382                 /* Rule 4: Prefer home address */
1383                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1384                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1385                 break;
1386             }
1387 #endif
1388         case IPV6_SADDR_RULE_OIF:
1389                 /* Rule 5: Prefer outgoing interface */
1390                 ret = (!dst->ifindex ||
1391                        dst->ifindex == score->ifa->idev->dev->ifindex);
1392                 break;
1393         case IPV6_SADDR_RULE_LABEL:
1394                 /* Rule 6: Prefer matching label */
1395                 ret = ipv6_addr_label(net,
1396                                       &score->ifa->addr, score->addr_type,
1397                                       score->ifa->idev->dev->ifindex) == dst->label;
1398                 break;
1399         case IPV6_SADDR_RULE_PRIVACY:
1400             {
1401                 /* Rule 7: Prefer public address
1402                  * Note: prefer temporary address if use_tempaddr >= 2
1403                  */
1404                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1405                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1406                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1407                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1408                 break;
1409             }
1410         case IPV6_SADDR_RULE_ORCHID:
1411                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1412                  *          non-ORCHID vs non-ORCHID
1413                  */
1414                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1415                         ipv6_addr_orchid(dst->addr));
1416                 break;
1417         case IPV6_SADDR_RULE_PREFIX:
1418                 /* Rule 8: Use longest matching prefix */
1419                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1420                 if (ret > score->ifa->prefix_len)
1421                         ret = score->ifa->prefix_len;
1422                 score->matchlen = ret;
1423                 break;
1424 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1425         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1426                 /* Optimistic addresses still have lower precedence than other
1427                  * preferred addresses.
1428                  */
1429                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1430                 break;
1431 #endif
1432         default:
1433                 ret = 0;
1434         }
1435
1436         if (ret)
1437                 __set_bit(i, score->scorebits);
1438         score->rule = i;
1439 out:
1440         return ret;
1441 }
1442
1443 static int __ipv6_dev_get_saddr(struct net *net,
1444                                 struct ipv6_saddr_dst *dst,
1445                                 struct inet6_dev *idev,
1446                                 struct ipv6_saddr_score *scores,
1447                                 int hiscore_idx)
1448 {
1449         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1450
1451         read_lock_bh(&idev->lock);
1452         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1453                 int i;
1454
1455                 /*
1456                  * - Tentative Address (RFC2462 section 5.4)
1457                  *  - A tentative address is not considered
1458                  *    "assigned to an interface" in the traditional
1459                  *    sense, unless it is also flagged as optimistic.
1460                  * - Candidate Source Address (section 4)
1461                  *  - In any case, anycast addresses, multicast
1462                  *    addresses, and the unspecified address MUST
1463                  *    NOT be included in a candidate set.
1464                  */
1465                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1466                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1467                         continue;
1468
1469                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1470
1471                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1472                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1473                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1474                                             idev->dev->name);
1475                         continue;
1476                 }
1477
1478                 score->rule = -1;
1479                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1480
1481                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1482                         int minihiscore, miniscore;
1483
1484                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1485                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1486
1487                         if (minihiscore > miniscore) {
1488                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1489                                     score->scopedist > 0) {
1490                                         /*
1491                                          * special case:
1492                                          * each remaining entry
1493                                          * has too small (not enough)
1494                                          * scope, because ifa entries
1495                                          * are sorted by their scope
1496                                          * values.
1497                                          */
1498                                         goto out;
1499                                 }
1500                                 break;
1501                         } else if (minihiscore < miniscore) {
1502                                 if (hiscore->ifa)
1503                                         in6_ifa_put(hiscore->ifa);
1504
1505                                 in6_ifa_hold(score->ifa);
1506
1507                                 swap(hiscore, score);
1508                                 hiscore_idx = 1 - hiscore_idx;
1509
1510                                 /* restore our iterator */
1511                                 score->ifa = hiscore->ifa;
1512
1513                                 break;
1514                         }
1515                 }
1516         }
1517 out:
1518         read_unlock_bh(&idev->lock);
1519         return hiscore_idx;
1520 }
1521
1522 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1523                        const struct in6_addr *daddr, unsigned int prefs,
1524                        struct in6_addr *saddr)
1525 {
1526         struct ipv6_saddr_score scores[2], *hiscore;
1527         struct ipv6_saddr_dst dst;
1528         struct inet6_dev *idev;
1529         struct net_device *dev;
1530         int dst_type;
1531         bool use_oif_addr = false;
1532         int hiscore_idx = 0;
1533
1534         dst_type = __ipv6_addr_type(daddr);
1535         dst.addr = daddr;
1536         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1537         dst.scope = __ipv6_addr_src_scope(dst_type);
1538         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1539         dst.prefs = prefs;
1540
1541         scores[hiscore_idx].rule = -1;
1542         scores[hiscore_idx].ifa = NULL;
1543
1544         rcu_read_lock();
1545
1546         /* Candidate Source Address (section 4)
1547          *  - multicast and link-local destination address,
1548          *    the set of candidate source address MUST only
1549          *    include addresses assigned to interfaces
1550          *    belonging to the same link as the outgoing
1551          *    interface.
1552          * (- For site-local destination addresses, the
1553          *    set of candidate source addresses MUST only
1554          *    include addresses assigned to interfaces
1555          *    belonging to the same site as the outgoing
1556          *    interface.)
1557          *  - "It is RECOMMENDED that the candidate source addresses
1558          *    be the set of unicast addresses assigned to the
1559          *    interface that will be used to send to the destination
1560          *    (the 'outgoing' interface)." (RFC 6724)
1561          */
1562         if (dst_dev) {
1563                 idev = __in6_dev_get(dst_dev);
1564                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1565                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1566                     (idev && idev->cnf.use_oif_addrs_only)) {
1567                         use_oif_addr = true;
1568                 }
1569         }
1570
1571         if (use_oif_addr) {
1572                 if (idev)
1573                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1574         } else {
1575                 for_each_netdev_rcu(net, dev) {
1576                         idev = __in6_dev_get(dev);
1577                         if (!idev)
1578                                 continue;
1579                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1580                 }
1581         }
1582         rcu_read_unlock();
1583
1584         hiscore = &scores[hiscore_idx];
1585         if (!hiscore->ifa)
1586                 return -EADDRNOTAVAIL;
1587
1588         *saddr = hiscore->ifa->addr;
1589         in6_ifa_put(hiscore->ifa);
1590         return 0;
1591 }
1592 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1593
1594 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1595                       u32 banned_flags)
1596 {
1597         struct inet6_ifaddr *ifp;
1598         int err = -EADDRNOTAVAIL;
1599
1600         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1601                 if (ifp->scope > IFA_LINK)
1602                         break;
1603                 if (ifp->scope == IFA_LINK &&
1604                     !(ifp->flags & banned_flags)) {
1605                         *addr = ifp->addr;
1606                         err = 0;
1607                         break;
1608                 }
1609         }
1610         return err;
1611 }
1612
1613 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1614                     u32 banned_flags)
1615 {
1616         struct inet6_dev *idev;
1617         int err = -EADDRNOTAVAIL;
1618
1619         rcu_read_lock();
1620         idev = __in6_dev_get(dev);
1621         if (idev) {
1622                 read_lock_bh(&idev->lock);
1623                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1624                 read_unlock_bh(&idev->lock);
1625         }
1626         rcu_read_unlock();
1627         return err;
1628 }
1629
1630 static int ipv6_count_addresses(struct inet6_dev *idev)
1631 {
1632         int cnt = 0;
1633         struct inet6_ifaddr *ifp;
1634
1635         read_lock_bh(&idev->lock);
1636         list_for_each_entry(ifp, &idev->addr_list, if_list)
1637                 cnt++;
1638         read_unlock_bh(&idev->lock);
1639         return cnt;
1640 }
1641
1642 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1643                   const struct net_device *dev, int strict)
1644 {
1645         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1646 }
1647 EXPORT_SYMBOL(ipv6_chk_addr);
1648
1649 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1650                             const struct net_device *dev, int strict,
1651                             u32 banned_flags)
1652 {
1653         struct inet6_ifaddr *ifp;
1654         unsigned int hash = inet6_addr_hash(addr);
1655         u32 ifp_flags;
1656
1657         rcu_read_lock_bh();
1658         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1659                 if (!net_eq(dev_net(ifp->idev->dev), net))
1660                         continue;
1661                 /* Decouple optimistic from tentative for evaluation here.
1662                  * Ban optimistic addresses explicitly, when required.
1663                  */
1664                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1665                             ? (ifp->flags&~IFA_F_TENTATIVE)
1666                             : ifp->flags;
1667                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1668                     !(ifp_flags&banned_flags) &&
1669                     (!dev || ifp->idev->dev == dev ||
1670                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1671                         rcu_read_unlock_bh();
1672                         return 1;
1673                 }
1674         }
1675
1676         rcu_read_unlock_bh();
1677         return 0;
1678 }
1679 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1680
1681 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1682                                struct net_device *dev)
1683 {
1684         unsigned int hash = inet6_addr_hash(addr);
1685         struct inet6_ifaddr *ifp;
1686
1687         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1688                 if (!net_eq(dev_net(ifp->idev->dev), net))
1689                         continue;
1690                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1691                         if (!dev || ifp->idev->dev == dev)
1692                                 return true;
1693                 }
1694         }
1695         return false;
1696 }
1697
1698 /* Compares an address/prefix_len with addresses on device @dev.
1699  * If one is found it returns true.
1700  */
1701 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1702         const unsigned int prefix_len, struct net_device *dev)
1703 {
1704         struct inet6_dev *idev;
1705         struct inet6_ifaddr *ifa;
1706         bool ret = false;
1707
1708         rcu_read_lock();
1709         idev = __in6_dev_get(dev);
1710         if (idev) {
1711                 read_lock_bh(&idev->lock);
1712                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1713                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1714                         if (ret)
1715                                 break;
1716                 }
1717                 read_unlock_bh(&idev->lock);
1718         }
1719         rcu_read_unlock();
1720
1721         return ret;
1722 }
1723 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1724
1725 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1726 {
1727         struct inet6_dev *idev;
1728         struct inet6_ifaddr *ifa;
1729         int     onlink;
1730
1731         onlink = 0;
1732         rcu_read_lock();
1733         idev = __in6_dev_get(dev);
1734         if (idev) {
1735                 read_lock_bh(&idev->lock);
1736                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1737                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1738                                                    ifa->prefix_len);
1739                         if (onlink)
1740                                 break;
1741                 }
1742                 read_unlock_bh(&idev->lock);
1743         }
1744         rcu_read_unlock();
1745         return onlink;
1746 }
1747 EXPORT_SYMBOL(ipv6_chk_prefix);
1748
1749 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1750                                      struct net_device *dev, int strict)
1751 {
1752         struct inet6_ifaddr *ifp, *result = NULL;
1753         unsigned int hash = inet6_addr_hash(addr);
1754
1755         rcu_read_lock_bh();
1756         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1757                 if (!net_eq(dev_net(ifp->idev->dev), net))
1758                         continue;
1759                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1760                         if (!dev || ifp->idev->dev == dev ||
1761                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1762                                 result = ifp;
1763                                 in6_ifa_hold(ifp);
1764                                 break;
1765                         }
1766                 }
1767         }
1768         rcu_read_unlock_bh();
1769
1770         return result;
1771 }
1772
1773 /* Gets referenced address, destroys ifaddr */
1774
1775 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1776 {
1777         if (ifp->flags&IFA_F_PERMANENT) {
1778                 spin_lock_bh(&ifp->lock);
1779                 addrconf_del_dad_work(ifp);
1780                 ifp->flags |= IFA_F_TENTATIVE;
1781                 if (dad_failed)
1782                         ifp->flags |= IFA_F_DADFAILED;
1783                 spin_unlock_bh(&ifp->lock);
1784                 if (dad_failed)
1785                         ipv6_ifa_notify(0, ifp);
1786                 in6_ifa_put(ifp);
1787         } else if (ifp->flags&IFA_F_TEMPORARY) {
1788                 struct inet6_ifaddr *ifpub;
1789                 spin_lock_bh(&ifp->lock);
1790                 ifpub = ifp->ifpub;
1791                 if (ifpub) {
1792                         in6_ifa_hold(ifpub);
1793                         spin_unlock_bh(&ifp->lock);
1794                         ipv6_create_tempaddr(ifpub, ifp);
1795                         in6_ifa_put(ifpub);
1796                 } else {
1797                         spin_unlock_bh(&ifp->lock);
1798                 }
1799                 ipv6_del_addr(ifp);
1800         } else {
1801                 ipv6_del_addr(ifp);
1802         }
1803 }
1804
1805 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1806 {
1807         int err = -ENOENT;
1808
1809         spin_lock_bh(&ifp->lock);
1810         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1811                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1812                 err = 0;
1813         }
1814         spin_unlock_bh(&ifp->lock);
1815
1816         return err;
1817 }
1818
1819 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1820 {
1821         struct in6_addr addr;
1822         struct inet6_dev *idev = ifp->idev;
1823         struct net *net = dev_net(ifp->idev->dev);
1824
1825         if (addrconf_dad_end(ifp)) {
1826                 in6_ifa_put(ifp);
1827                 return;
1828         }
1829
1830         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1831                              ifp->idev->dev->name, &ifp->addr);
1832
1833         spin_lock_bh(&ifp->lock);
1834
1835         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1836                 int scope = ifp->scope;
1837                 u32 flags = ifp->flags;
1838                 struct in6_addr new_addr;
1839                 struct inet6_ifaddr *ifp2;
1840                 u32 valid_lft, preferred_lft;
1841                 int pfxlen = ifp->prefix_len;
1842                 int retries = ifp->stable_privacy_retry + 1;
1843
1844                 if (retries > net->ipv6.sysctl.idgen_retries) {
1845                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1846                                              ifp->idev->dev->name);
1847                         goto errdad;
1848                 }
1849
1850                 new_addr = ifp->addr;
1851                 if (ipv6_generate_stable_address(&new_addr, retries,
1852                                                  idev))
1853                         goto errdad;
1854
1855                 valid_lft = ifp->valid_lft;
1856                 preferred_lft = ifp->prefered_lft;
1857
1858                 spin_unlock_bh(&ifp->lock);
1859
1860                 if (idev->cnf.max_addresses &&
1861                     ipv6_count_addresses(idev) >=
1862                     idev->cnf.max_addresses)
1863                         goto lock_errdad;
1864
1865                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1866                                      ifp->idev->dev->name);
1867
1868                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1869                                      scope, flags, valid_lft,
1870                                      preferred_lft);
1871                 if (IS_ERR(ifp2))
1872                         goto lock_errdad;
1873
1874                 spin_lock_bh(&ifp2->lock);
1875                 ifp2->stable_privacy_retry = retries;
1876                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1877                 spin_unlock_bh(&ifp2->lock);
1878
1879                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1880                 in6_ifa_put(ifp2);
1881 lock_errdad:
1882                 spin_lock_bh(&ifp->lock);
1883         } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1884                 addr.s6_addr32[0] = htonl(0xfe800000);
1885                 addr.s6_addr32[1] = 0;
1886
1887                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1888                     ipv6_addr_equal(&ifp->addr, &addr)) {
1889                         /* DAD failed for link-local based on MAC address */
1890                         idev->cnf.disable_ipv6 = 1;
1891
1892                         pr_info("%s: IPv6 being disabled!\n",
1893                                 ifp->idev->dev->name);
1894                 }
1895         }
1896
1897 errdad:
1898         /* transition from _POSTDAD to _ERRDAD */
1899         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1900         spin_unlock_bh(&ifp->lock);
1901
1902         addrconf_mod_dad_work(ifp, 0);
1903         in6_ifa_put(ifp);
1904 }
1905
1906 /* Join to solicited addr multicast group.
1907  * caller must hold RTNL */
1908 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1909 {
1910         struct in6_addr maddr;
1911
1912         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1913                 return;
1914
1915         addrconf_addr_solict_mult(addr, &maddr);
1916         ipv6_dev_mc_inc(dev, &maddr);
1917 }
1918
1919 /* caller must hold RTNL */
1920 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1921 {
1922         struct in6_addr maddr;
1923
1924         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1925                 return;
1926
1927         addrconf_addr_solict_mult(addr, &maddr);
1928         __ipv6_dev_mc_dec(idev, &maddr);
1929 }
1930
1931 /* caller must hold RTNL */
1932 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1933 {
1934         struct in6_addr addr;
1935
1936         if (ifp->prefix_len >= 127) /* RFC 6164 */
1937                 return;
1938         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1939         if (ipv6_addr_any(&addr))
1940                 return;
1941         __ipv6_dev_ac_inc(ifp->idev, &addr);
1942 }
1943
1944 /* caller must hold RTNL */
1945 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1946 {
1947         struct in6_addr addr;
1948
1949         if (ifp->prefix_len >= 127) /* RFC 6164 */
1950                 return;
1951         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1952         if (ipv6_addr_any(&addr))
1953                 return;
1954         __ipv6_dev_ac_dec(ifp->idev, &addr);
1955 }
1956
1957 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1958 {
1959         if (dev->addr_len != IEEE802154_ADDR_LEN)
1960                 return -1;
1961         memcpy(eui, dev->dev_addr, 8);
1962         eui[0] ^= 2;
1963         return 0;
1964 }
1965
1966 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1967 {
1968         union fwnet_hwaddr *ha;
1969
1970         if (dev->addr_len != FWNET_ALEN)
1971                 return -1;
1972
1973         ha = (union fwnet_hwaddr *)dev->dev_addr;
1974
1975         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1976         eui[0] ^= 2;
1977         return 0;
1978 }
1979
1980 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1981 {
1982         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1983         if (dev->addr_len != ARCNET_ALEN)
1984                 return -1;
1985         memset(eui, 0, 7);
1986         eui[7] = *(u8 *)dev->dev_addr;
1987         return 0;
1988 }
1989
1990 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1991 {
1992         if (dev->addr_len != INFINIBAND_ALEN)
1993                 return -1;
1994         memcpy(eui, dev->dev_addr + 12, 8);
1995         eui[0] |= 2;
1996         return 0;
1997 }
1998
1999 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2000 {
2001         if (addr == 0)
2002                 return -1;
2003         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2004                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2005                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2006                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2007                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2008                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2009         eui[1] = 0;
2010         eui[2] = 0x5E;
2011         eui[3] = 0xFE;
2012         memcpy(eui + 4, &addr, 4);
2013         return 0;
2014 }
2015
2016 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2017 {
2018         if (dev->priv_flags & IFF_ISATAP)
2019                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2020         return -1;
2021 }
2022
2023 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2024 {
2025         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2026 }
2027
2028 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2029 {
2030         memcpy(eui, dev->perm_addr, 3);
2031         memcpy(eui + 5, dev->perm_addr + 3, 3);
2032         eui[3] = 0xFF;
2033         eui[4] = 0xFE;
2034         eui[0] ^= 2;
2035         return 0;
2036 }
2037
2038 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2039 {
2040         switch (dev->type) {
2041         case ARPHRD_ETHER:
2042         case ARPHRD_FDDI:
2043                 return addrconf_ifid_eui48(eui, dev);
2044         case ARPHRD_ARCNET:
2045                 return addrconf_ifid_arcnet(eui, dev);
2046         case ARPHRD_INFINIBAND:
2047                 return addrconf_ifid_infiniband(eui, dev);
2048         case ARPHRD_SIT:
2049                 return addrconf_ifid_sit(eui, dev);
2050         case ARPHRD_IPGRE:
2051                 return addrconf_ifid_gre(eui, dev);
2052         case ARPHRD_6LOWPAN:
2053         case ARPHRD_IEEE802154:
2054                 return addrconf_ifid_eui64(eui, dev);
2055         case ARPHRD_IEEE1394:
2056                 return addrconf_ifid_ieee1394(eui, dev);
2057         case ARPHRD_TUNNEL6:
2058                 return addrconf_ifid_ip6tnl(eui, dev);
2059         }
2060         return -1;
2061 }
2062
2063 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2064 {
2065         int err = -1;
2066         struct inet6_ifaddr *ifp;
2067
2068         read_lock_bh(&idev->lock);
2069         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2070                 if (ifp->scope > IFA_LINK)
2071                         break;
2072                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2073                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2074                         err = 0;
2075                         break;
2076                 }
2077         }
2078         read_unlock_bh(&idev->lock);
2079         return err;
2080 }
2081
2082 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2083 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2084 {
2085 regen:
2086         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2087         idev->rndid[0] &= ~0x02;
2088
2089         /*
2090          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2091          * check if generated address is not inappropriate
2092          *
2093          *  - Reserved subnet anycast (RFC 2526)
2094          *      11111101 11....11 1xxxxxxx
2095          *  - ISATAP (RFC4214) 6.1
2096          *      00-00-5E-FE-xx-xx-xx-xx
2097          *  - value 0
2098          *  - XXX: already assigned to an address on the device
2099          */
2100         if (idev->rndid[0] == 0xfd &&
2101             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2102             (idev->rndid[7]&0x80))
2103                 goto regen;
2104         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2105                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2106                         goto regen;
2107                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2108                         goto regen;
2109         }
2110 }
2111
2112 static void ipv6_regen_rndid(unsigned long data)
2113 {
2114         struct inet6_dev *idev = (struct inet6_dev *) data;
2115         unsigned long expires;
2116
2117         rcu_read_lock_bh();
2118         write_lock_bh(&idev->lock);
2119
2120         if (idev->dead)
2121                 goto out;
2122
2123         __ipv6_regen_rndid(idev);
2124
2125         expires = jiffies +
2126                 idev->cnf.temp_prefered_lft * HZ -
2127                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2128                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2129                 idev->cnf.max_desync_factor * HZ;
2130         if (time_before(expires, jiffies)) {
2131                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2132                         __func__, idev->dev->name);
2133                 goto out;
2134         }
2135
2136         if (!mod_timer(&idev->regen_timer, expires))
2137                 in6_dev_hold(idev);
2138
2139 out:
2140         write_unlock_bh(&idev->lock);
2141         rcu_read_unlock_bh();
2142         in6_dev_put(idev);
2143 }
2144
2145 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2146 {
2147         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2148                 __ipv6_regen_rndid(idev);
2149 }
2150
2151 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table) {
2152         /* Determines into what table to put autoconf PIO/RIO/default routes
2153          * learned on this device.
2154          *
2155          * - If 0, use the same table for every device. This puts routes into
2156          *   one of RT_TABLE_{PREFIX,INFO,DFLT} depending on the type of route
2157          *   (but note that these three are currently all equal to
2158          *   RT6_TABLE_MAIN).
2159          * - If > 0, use the specified table.
2160          * - If < 0, put routes into table dev->ifindex + (-rt_table).
2161          */
2162         struct inet6_dev *idev = in6_dev_get(dev);
2163         u32 table;
2164         int sysctl = idev->cnf.accept_ra_rt_table;
2165         if (sysctl == 0) {
2166                 table = default_table;
2167         } else if (sysctl > 0) {
2168                 table = (u32) sysctl;
2169         } else {
2170                 table = (unsigned) dev->ifindex + (-sysctl);
2171         }
2172         in6_dev_put(idev);
2173         return table;
2174 }
2175
2176 /*
2177  *      Add prefix route.
2178  */
2179
2180 static void
2181 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2182                       unsigned long expires, u32 flags)
2183 {
2184         struct fib6_config cfg = {
2185                 .fc_table = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX),
2186                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2187                 .fc_ifindex = dev->ifindex,
2188                 .fc_expires = expires,
2189                 .fc_dst_len = plen,
2190                 .fc_flags = RTF_UP | flags,
2191                 .fc_nlinfo.nl_net = dev_net(dev),
2192                 .fc_protocol = RTPROT_KERNEL,
2193         };
2194
2195         cfg.fc_dst = *pfx;
2196
2197         /* Prevent useless cloning on PtP SIT.
2198            This thing is done here expecting that the whole
2199            class of non-broadcast devices need not cloning.
2200          */
2201 #if IS_ENABLED(CONFIG_IPV6_SIT)
2202         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2203                 cfg.fc_flags |= RTF_NONEXTHOP;
2204 #endif
2205
2206         ip6_route_add(&cfg);
2207 }
2208
2209
2210 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2211                                                   int plen,
2212                                                   const struct net_device *dev,
2213                                                   u32 flags, u32 noflags)
2214 {
2215         struct fib6_node *fn;
2216         struct rt6_info *rt = NULL;
2217         struct fib6_table *table;
2218         u32 tb_id = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX);
2219
2220         table = fib6_get_table(dev_net(dev), tb_id);
2221         if (!table)
2222                 return NULL;
2223
2224         read_lock_bh(&table->tb6_lock);
2225         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2226         if (!fn)
2227                 goto out;
2228
2229         noflags |= RTF_CACHE;
2230         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2231                 if (rt->dst.dev->ifindex != dev->ifindex)
2232                         continue;
2233                 if ((rt->rt6i_flags & flags) != flags)
2234                         continue;
2235                 if ((rt->rt6i_flags & noflags) != 0)
2236                         continue;
2237                 dst_hold(&rt->dst);
2238                 break;
2239         }
2240 out:
2241         read_unlock_bh(&table->tb6_lock);
2242         return rt;
2243 }
2244
2245
2246 /* Create "default" multicast route to the interface */
2247
2248 static void addrconf_add_mroute(struct net_device *dev)
2249 {
2250         struct fib6_config cfg = {
2251                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2252                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2253                 .fc_ifindex = dev->ifindex,
2254                 .fc_dst_len = 8,
2255                 .fc_flags = RTF_UP,
2256                 .fc_nlinfo.nl_net = dev_net(dev),
2257         };
2258
2259         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2260
2261         ip6_route_add(&cfg);
2262 }
2263
2264 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2265 {
2266         struct inet6_dev *idev;
2267
2268         ASSERT_RTNL();
2269
2270         idev = ipv6_find_idev(dev);
2271         if (!idev)
2272                 return ERR_PTR(-ENOBUFS);
2273
2274         if (idev->cnf.disable_ipv6)
2275                 return ERR_PTR(-EACCES);
2276
2277         /* Add default multicast route */
2278         if (!(dev->flags & IFF_LOOPBACK))
2279                 addrconf_add_mroute(dev);
2280
2281         return idev;
2282 }
2283
2284 static void manage_tempaddrs(struct inet6_dev *idev,
2285                              struct inet6_ifaddr *ifp,
2286                              __u32 valid_lft, __u32 prefered_lft,
2287                              bool create, unsigned long now)
2288 {
2289         u32 flags;
2290         struct inet6_ifaddr *ift;
2291
2292         read_lock_bh(&idev->lock);
2293         /* update all temporary addresses in the list */
2294         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2295                 int age, max_valid, max_prefered;
2296
2297                 if (ifp != ift->ifpub)
2298                         continue;
2299
2300                 /* RFC 4941 section 3.3:
2301                  * If a received option will extend the lifetime of a public
2302                  * address, the lifetimes of temporary addresses should
2303                  * be extended, subject to the overall constraint that no
2304                  * temporary addresses should ever remain "valid" or "preferred"
2305                  * for a time longer than (TEMP_VALID_LIFETIME) or
2306                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2307                  */
2308                 age = (now - ift->cstamp) / HZ;
2309                 max_valid = idev->cnf.temp_valid_lft - age;
2310                 if (max_valid < 0)
2311                         max_valid = 0;
2312
2313                 max_prefered = idev->cnf.temp_prefered_lft -
2314                                idev->cnf.max_desync_factor - age;
2315                 if (max_prefered < 0)
2316                         max_prefered = 0;
2317
2318                 if (valid_lft > max_valid)
2319                         valid_lft = max_valid;
2320
2321                 if (prefered_lft > max_prefered)
2322                         prefered_lft = max_prefered;
2323
2324                 spin_lock(&ift->lock);
2325                 flags = ift->flags;
2326                 ift->valid_lft = valid_lft;
2327                 ift->prefered_lft = prefered_lft;
2328                 ift->tstamp = now;
2329                 if (prefered_lft > 0)
2330                         ift->flags &= ~IFA_F_DEPRECATED;
2331
2332                 spin_unlock(&ift->lock);
2333                 if (!(flags&IFA_F_TENTATIVE))
2334                         ipv6_ifa_notify(0, ift);
2335         }
2336
2337         if ((create || list_empty(&idev->tempaddr_list)) &&
2338             idev->cnf.use_tempaddr > 0) {
2339                 /* When a new public address is created as described
2340                  * in [ADDRCONF], also create a new temporary address.
2341                  * Also create a temporary address if it's enabled but
2342                  * no temporary address currently exists.
2343                  */
2344                 read_unlock_bh(&idev->lock);
2345                 ipv6_create_tempaddr(ifp, NULL);
2346         } else {
2347                 read_unlock_bh(&idev->lock);
2348         }
2349 }
2350
2351 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2352 {
2353         struct prefix_info *pinfo;
2354         __u32 valid_lft;
2355         __u32 prefered_lft;
2356         int addr_type;
2357         u32 addr_flags = 0;
2358         struct inet6_dev *in6_dev;
2359         struct net *net = dev_net(dev);
2360
2361         pinfo = (struct prefix_info *) opt;
2362
2363         if (len < sizeof(struct prefix_info)) {
2364                 ADBG("addrconf: prefix option too short\n");
2365                 return;
2366         }
2367
2368         /*
2369          *      Validation checks ([ADDRCONF], page 19)
2370          */
2371
2372         addr_type = ipv6_addr_type(&pinfo->prefix);
2373
2374         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2375                 return;
2376
2377         valid_lft = ntohl(pinfo->valid);
2378         prefered_lft = ntohl(pinfo->prefered);
2379
2380         if (prefered_lft > valid_lft) {
2381                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2382                 return;
2383         }
2384
2385         in6_dev = in6_dev_get(dev);
2386
2387         if (!in6_dev) {
2388                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2389                                     dev->name);
2390                 return;
2391         }
2392
2393         /*
2394          *      Two things going on here:
2395          *      1) Add routes for on-link prefixes
2396          *      2) Configure prefixes with the auto flag set
2397          */
2398
2399         if (pinfo->onlink) {
2400                 struct rt6_info *rt;
2401                 unsigned long rt_expires;
2402
2403                 /* Avoid arithmetic overflow. Really, we could
2404                  * save rt_expires in seconds, likely valid_lft,
2405                  * but it would require division in fib gc, that it
2406                  * not good.
2407                  */
2408                 if (HZ > USER_HZ)
2409                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2410                 else
2411                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2412
2413                 if (addrconf_finite_timeout(rt_expires))
2414                         rt_expires *= HZ;
2415
2416                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2417                                                pinfo->prefix_len,
2418                                                dev,
2419                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2420                                                RTF_GATEWAY | RTF_DEFAULT);
2421
2422                 if (rt) {
2423                         /* Autoconf prefix route */
2424                         if (valid_lft == 0) {
2425                                 ip6_del_rt(rt);
2426                                 rt = NULL;
2427                         } else if (addrconf_finite_timeout(rt_expires)) {
2428                                 /* not infinity */
2429                                 rt6_set_expires(rt, jiffies + rt_expires);
2430                         } else {
2431                                 rt6_clean_expires(rt);
2432                         }
2433                 } else if (valid_lft) {
2434                         clock_t expires = 0;
2435                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2436                         if (addrconf_finite_timeout(rt_expires)) {
2437                                 /* not infinity */
2438                                 flags |= RTF_EXPIRES;
2439                                 expires = jiffies_to_clock_t(rt_expires);
2440                         }
2441                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2442                                               dev, expires, flags);
2443                 }
2444                 ip6_rt_put(rt);
2445         }
2446
2447         /* Try to figure out our local address for this prefix */
2448
2449         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2450                 struct inet6_ifaddr *ifp;
2451                 struct in6_addr addr;
2452                 int create = 0, update_lft = 0;
2453                 bool tokenized = false;
2454
2455                 if (pinfo->prefix_len == 64) {
2456                         memcpy(&addr, &pinfo->prefix, 8);
2457
2458                         if (!ipv6_addr_any(&in6_dev->token)) {
2459                                 read_lock_bh(&in6_dev->lock);
2460                                 memcpy(addr.s6_addr + 8,
2461                                        in6_dev->token.s6_addr + 8, 8);
2462                                 read_unlock_bh(&in6_dev->lock);
2463                                 tokenized = true;
2464                         } else if (in6_dev->addr_gen_mode ==
2465                                    IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2466                                    !ipv6_generate_stable_address(&addr, 0,
2467                                                                  in6_dev)) {
2468                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2469                                 goto ok;
2470                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2471                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2472                                 in6_dev_put(in6_dev);
2473                                 return;
2474                         }
2475                         goto ok;
2476                 }
2477                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2478                                     pinfo->prefix_len);
2479                 in6_dev_put(in6_dev);
2480                 return;
2481
2482 ok:
2483
2484                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2485
2486                 if (!ifp && valid_lft) {
2487                         int max_addresses = in6_dev->cnf.max_addresses;
2488
2489 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2490                         if (in6_dev->cnf.optimistic_dad &&
2491                             !net->ipv6.devconf_all->forwarding && sllao)
2492                                 addr_flags |= IFA_F_OPTIMISTIC;
2493 #endif
2494
2495                         /* Do not allow to create too much of autoconfigured
2496                          * addresses; this would be too easy way to crash kernel.
2497                          */
2498                         if (!max_addresses ||
2499                             ipv6_count_addresses(in6_dev) < max_addresses)
2500                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2501                                                     pinfo->prefix_len,
2502                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2503                                                     addr_flags, valid_lft,
2504                                                     prefered_lft);
2505
2506                         if (IS_ERR_OR_NULL(ifp)) {
2507                                 in6_dev_put(in6_dev);
2508                                 return;
2509                         }
2510
2511                         update_lft = 0;
2512                         create = 1;
2513                         spin_lock_bh(&ifp->lock);
2514                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2515                         ifp->cstamp = jiffies;
2516                         ifp->tokenized = tokenized;
2517                         spin_unlock_bh(&ifp->lock);
2518                         addrconf_dad_start(ifp);
2519                 }
2520
2521                 if (ifp) {
2522                         u32 flags;
2523                         unsigned long now;
2524                         u32 stored_lft;
2525
2526                         /* update lifetime (RFC2462 5.5.3 e) */
2527                         spin_lock_bh(&ifp->lock);
2528                         now = jiffies;
2529                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2530                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2531                         else
2532                                 stored_lft = 0;
2533                         if (!update_lft && !create && stored_lft) {
2534                                 const u32 minimum_lft = min_t(u32,
2535                                         stored_lft, MIN_VALID_LIFETIME);
2536                                 valid_lft = max(valid_lft, minimum_lft);
2537
2538                                 /* RFC4862 Section 5.5.3e:
2539                                  * "Note that the preferred lifetime of the
2540                                  *  corresponding address is always reset to
2541                                  *  the Preferred Lifetime in the received
2542                                  *  Prefix Information option, regardless of
2543                                  *  whether the valid lifetime is also reset or
2544                                  *  ignored."
2545                                  *
2546                                  * So we should always update prefered_lft here.
2547                                  */
2548                                 update_lft = 1;
2549                         }
2550
2551                         if (update_lft) {
2552                                 ifp->valid_lft = valid_lft;
2553                                 ifp->prefered_lft = prefered_lft;
2554                                 ifp->tstamp = now;
2555                                 flags = ifp->flags;
2556                                 ifp->flags &= ~IFA_F_DEPRECATED;
2557                                 spin_unlock_bh(&ifp->lock);
2558
2559                                 if (!(flags&IFA_F_TENTATIVE))
2560                                         ipv6_ifa_notify(0, ifp);
2561                         } else
2562                                 spin_unlock_bh(&ifp->lock);
2563
2564                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2565                                          create, now);
2566
2567                         in6_ifa_put(ifp);
2568                         addrconf_verify();
2569                 }
2570         }
2571         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2572         in6_dev_put(in6_dev);
2573 }
2574
2575 /*
2576  *      Set destination address.
2577  *      Special case for SIT interfaces where we create a new "virtual"
2578  *      device.
2579  */
2580 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2581 {
2582         struct in6_ifreq ireq;
2583         struct net_device *dev;
2584         int err = -EINVAL;
2585
2586         rtnl_lock();
2587
2588         err = -EFAULT;
2589         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2590                 goto err_exit;
2591
2592         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2593
2594         err = -ENODEV;
2595         if (!dev)
2596                 goto err_exit;
2597
2598 #if IS_ENABLED(CONFIG_IPV6_SIT)
2599         if (dev->type == ARPHRD_SIT) {
2600                 const struct net_device_ops *ops = dev->netdev_ops;
2601                 struct ifreq ifr;
2602                 struct ip_tunnel_parm p;
2603
2604                 err = -EADDRNOTAVAIL;
2605                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2606                         goto err_exit;
2607
2608                 memset(&p, 0, sizeof(p));
2609                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2610                 p.iph.saddr = 0;
2611                 p.iph.version = 4;
2612                 p.iph.ihl = 5;
2613                 p.iph.protocol = IPPROTO_IPV6;
2614                 p.iph.ttl = 64;
2615                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2616
2617                 if (ops->ndo_do_ioctl) {
2618                         mm_segment_t oldfs = get_fs();
2619
2620                         set_fs(KERNEL_DS);
2621                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2622                         set_fs(oldfs);
2623                 } else
2624                         err = -EOPNOTSUPP;
2625
2626                 if (err == 0) {
2627                         err = -ENOBUFS;
2628                         dev = __dev_get_by_name(net, p.name);
2629                         if (!dev)
2630                                 goto err_exit;
2631                         err = dev_open(dev);
2632                 }
2633         }
2634 #endif
2635
2636 err_exit:
2637         rtnl_unlock();
2638         return err;
2639 }
2640
2641 static int ipv6_mc_config(struct sock *sk, bool join,
2642                           const struct in6_addr *addr, int ifindex)
2643 {
2644         int ret;
2645
2646         ASSERT_RTNL();
2647
2648         lock_sock(sk);
2649         if (join)
2650                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2651         else
2652                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2653         release_sock(sk);
2654
2655         return ret;
2656 }
2657
2658 /*
2659  *      Manual configuration of address on an interface
2660  */
2661 static int inet6_addr_add(struct net *net, int ifindex,
2662                           const struct in6_addr *pfx,
2663                           const struct in6_addr *peer_pfx,
2664                           unsigned int plen, __u32 ifa_flags,
2665                           __u32 prefered_lft, __u32 valid_lft)
2666 {
2667         struct inet6_ifaddr *ifp;
2668         struct inet6_dev *idev;
2669         struct net_device *dev;
2670         unsigned long timeout;
2671         clock_t expires;
2672         int scope;
2673         u32 flags;
2674
2675         ASSERT_RTNL();
2676
2677         if (plen > 128)
2678                 return -EINVAL;
2679
2680         /* check the lifetime */
2681         if (!valid_lft || prefered_lft > valid_lft)
2682                 return -EINVAL;
2683
2684         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2685                 return -EINVAL;
2686
2687         dev = __dev_get_by_index(net, ifindex);
2688         if (!dev)
2689                 return -ENODEV;
2690
2691         idev = addrconf_add_dev(dev);
2692         if (IS_ERR(idev))
2693                 return PTR_ERR(idev);
2694
2695         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2696                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2697                                          true, pfx, ifindex);
2698
2699                 if (ret < 0)
2700                         return ret;
2701         }
2702
2703         scope = ipv6_addr_scope(pfx);
2704
2705         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2706         if (addrconf_finite_timeout(timeout)) {
2707                 expires = jiffies_to_clock_t(timeout * HZ);
2708                 valid_lft = timeout;
2709                 flags = RTF_EXPIRES;
2710         } else {
2711                 expires = 0;
2712                 flags = 0;
2713                 ifa_flags |= IFA_F_PERMANENT;
2714         }
2715
2716         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2717         if (addrconf_finite_timeout(timeout)) {
2718                 if (timeout == 0)
2719                         ifa_flags |= IFA_F_DEPRECATED;
2720                 prefered_lft = timeout;
2721         }
2722
2723         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2724                             valid_lft, prefered_lft);
2725
2726         if (!IS_ERR(ifp)) {
2727                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2728                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2729                                               expires, flags);
2730                 }
2731
2732                 /*
2733                  * Note that section 3.1 of RFC 4429 indicates
2734                  * that the Optimistic flag should not be set for
2735                  * manually configured addresses
2736                  */
2737                 addrconf_dad_start(ifp);
2738                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2739                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2740                                          true, jiffies);
2741                 in6_ifa_put(ifp);
2742                 addrconf_verify_rtnl();
2743                 return 0;
2744         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2745                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2746                                false, pfx, ifindex);
2747         }
2748
2749         return PTR_ERR(ifp);
2750 }
2751
2752 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2753                           const struct in6_addr *pfx, unsigned int plen)
2754 {
2755         struct inet6_ifaddr *ifp;
2756         struct inet6_dev *idev;
2757         struct net_device *dev;
2758
2759         if (plen > 128)
2760                 return -EINVAL;
2761
2762         dev = __dev_get_by_index(net, ifindex);
2763         if (!dev)
2764                 return -ENODEV;
2765
2766         idev = __in6_dev_get(dev);
2767         if (!idev)
2768                 return -ENXIO;
2769
2770         read_lock_bh(&idev->lock);
2771         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2772                 if (ifp->prefix_len == plen &&
2773                     ipv6_addr_equal(pfx, &ifp->addr)) {
2774                         in6_ifa_hold(ifp);
2775                         read_unlock_bh(&idev->lock);
2776
2777                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2778                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2779                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2780                                                  jiffies);
2781                         ipv6_del_addr(ifp);
2782                         addrconf_verify_rtnl();
2783                         if (ipv6_addr_is_multicast(pfx)) {
2784                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2785                                                false, pfx, dev->ifindex);
2786                         }
2787                         return 0;
2788                 }
2789         }
2790         read_unlock_bh(&idev->lock);
2791         return -EADDRNOTAVAIL;
2792 }
2793
2794
2795 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2796 {
2797         struct in6_ifreq ireq;
2798         int err;
2799
2800         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2801                 return -EPERM;
2802
2803         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2804                 return -EFAULT;
2805
2806         rtnl_lock();
2807         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2808                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2809                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2810         rtnl_unlock();
2811         return err;
2812 }
2813
2814 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2815 {
2816         struct in6_ifreq ireq;
2817         int err;
2818
2819         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2820                 return -EPERM;
2821
2822         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2823                 return -EFAULT;
2824
2825         rtnl_lock();
2826         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2827                              ireq.ifr6_prefixlen);
2828         rtnl_unlock();
2829         return err;
2830 }
2831
2832 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2833                      int plen, int scope)
2834 {
2835         struct inet6_ifaddr *ifp;
2836
2837         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2838                             scope, IFA_F_PERMANENT,
2839                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2840         if (!IS_ERR(ifp)) {
2841                 spin_lock_bh(&ifp->lock);
2842                 ifp->flags &= ~IFA_F_TENTATIVE;
2843                 spin_unlock_bh(&ifp->lock);
2844                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2845                 in6_ifa_put(ifp);
2846         }
2847 }
2848
2849 #if IS_ENABLED(CONFIG_IPV6_SIT)
2850 static void sit_add_v4_addrs(struct inet6_dev *idev)
2851 {
2852         struct in6_addr addr;
2853         struct net_device *dev;
2854         struct net *net = dev_net(idev->dev);
2855         int scope, plen;
2856         u32 pflags = 0;
2857
2858         ASSERT_RTNL();
2859
2860         memset(&addr, 0, sizeof(struct in6_addr));
2861         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2862
2863         if (idev->dev->flags&IFF_POINTOPOINT) {
2864                 addr.s6_addr32[0] = htonl(0xfe800000);
2865                 scope = IFA_LINK;
2866                 plen = 64;
2867         } else {
2868                 scope = IPV6_ADDR_COMPATv4;
2869                 plen = 96;
2870                 pflags |= RTF_NONEXTHOP;
2871         }
2872
2873         if (addr.s6_addr32[3]) {
2874                 add_addr(idev, &addr, plen, scope);
2875                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2876                 return;
2877         }
2878
2879         for_each_netdev(net, dev) {
2880                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2881                 if (in_dev && (dev->flags & IFF_UP)) {
2882                         struct in_ifaddr *ifa;
2883
2884                         int flag = scope;
2885
2886                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2887
2888                                 addr.s6_addr32[3] = ifa->ifa_local;
2889
2890                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2891                                         continue;
2892                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2893                                         if (idev->dev->flags&IFF_POINTOPOINT)
2894                                                 continue;
2895                                         flag |= IFA_HOST;
2896                                 }
2897
2898                                 add_addr(idev, &addr, plen, flag);
2899                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2900                                                       pflags);
2901                         }
2902                 }
2903         }
2904 }
2905 #endif
2906
2907 static void init_loopback(struct net_device *dev)
2908 {
2909         struct inet6_dev  *idev;
2910         struct net_device *sp_dev;
2911         struct inet6_ifaddr *sp_ifa;
2912         struct rt6_info *sp_rt;
2913
2914         /* ::1 */
2915
2916         ASSERT_RTNL();
2917
2918         idev = ipv6_find_idev(dev);
2919         if (!idev) {
2920                 pr_debug("%s: add_dev failed\n", __func__);
2921                 return;
2922         }
2923
2924         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2925
2926         /* Add routes to other interface's IPv6 addresses */
2927         for_each_netdev(dev_net(dev), sp_dev) {
2928                 if (!strcmp(sp_dev->name, dev->name))
2929                         continue;
2930
2931                 idev = __in6_dev_get(sp_dev);
2932                 if (!idev)
2933                         continue;
2934
2935                 read_lock_bh(&idev->lock);
2936                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2937
2938                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2939                                 continue;
2940
2941                         if (sp_ifa->rt) {
2942                                 /* This dst has been added to garbage list when
2943                                  * lo device down, release this obsolete dst and
2944                                  * reallocate a new router for ifa.
2945                                  */
2946                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
2947                                         ip6_rt_put(sp_ifa->rt);
2948                                         sp_ifa->rt = NULL;
2949                                 } else {
2950                                         continue;
2951                                 }
2952                         }
2953
2954                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2955
2956                         /* Failure cases are ignored */
2957                         if (!IS_ERR(sp_rt)) {
2958                                 sp_ifa->rt = sp_rt;
2959                                 ip6_ins_rt(sp_rt);
2960                         }
2961                 }
2962                 read_unlock_bh(&idev->lock);
2963         }
2964 }
2965
2966 static void addrconf_add_linklocal(struct inet6_dev *idev,
2967                                    const struct in6_addr *addr, u32 flags)
2968 {
2969         struct inet6_ifaddr *ifp;
2970         u32 addr_flags = flags | IFA_F_PERMANENT;
2971
2972 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2973         if (idev->cnf.optimistic_dad &&
2974             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2975                 addr_flags |= IFA_F_OPTIMISTIC;
2976 #endif
2977
2978         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2979                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2980         if (!IS_ERR(ifp)) {
2981                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2982                 addrconf_dad_start(ifp);
2983                 in6_ifa_put(ifp);
2984         }
2985 }
2986
2987 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2988 {
2989         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2990                 return true;
2991
2992         if (address.s6_addr32[2] == htonl(0x02005eff) &&
2993             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2994                 return true;
2995
2996         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2997             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2998                 return true;
2999
3000         return false;
3001 }
3002
3003 static int ipv6_generate_stable_address(struct in6_addr *address,
3004                                         u8 dad_count,
3005                                         const struct inet6_dev *idev)
3006 {
3007         static DEFINE_SPINLOCK(lock);
3008         static __u32 digest[SHA_DIGEST_WORDS];
3009         static __u32 workspace[SHA_WORKSPACE_WORDS];
3010
3011         static union {
3012                 char __data[SHA_MESSAGE_BYTES];
3013                 struct {
3014                         struct in6_addr secret;
3015                         __be32 prefix[2];
3016                         unsigned char hwaddr[MAX_ADDR_LEN];
3017                         u8 dad_count;
3018                 } __packed;
3019         } data;
3020
3021         struct in6_addr secret;
3022         struct in6_addr temp;
3023         struct net *net = dev_net(idev->dev);
3024
3025         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3026
3027         if (idev->cnf.stable_secret.initialized)
3028                 secret = idev->cnf.stable_secret.secret;
3029         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3030                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3031         else
3032                 return -1;
3033
3034 retry:
3035         spin_lock_bh(&lock);
3036
3037         sha_init(digest);
3038         memset(&data, 0, sizeof(data));
3039         memset(workspace, 0, sizeof(workspace));
3040         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3041         data.prefix[0] = address->s6_addr32[0];
3042         data.prefix[1] = address->s6_addr32[1];
3043         data.secret = secret;
3044         data.dad_count = dad_count;
3045
3046         sha_transform(digest, data.__data, workspace);
3047
3048         temp = *address;
3049         temp.s6_addr32[2] = (__force __be32)digest[0];
3050         temp.s6_addr32[3] = (__force __be32)digest[1];
3051
3052         spin_unlock_bh(&lock);
3053
3054         if (ipv6_reserved_interfaceid(temp)) {
3055                 dad_count++;
3056                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3057                         return -1;
3058                 goto retry;
3059         }
3060
3061         *address = temp;
3062         return 0;
3063 }
3064
3065 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3066 {
3067         struct in6_addr addr;
3068
3069         /* no link local addresses on L3 master devices */
3070         if (netif_is_l3_master(idev->dev))
3071                 return;
3072
3073         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3074
3075         if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3076                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3077                         addrconf_add_linklocal(idev, &addr,
3078                                                IFA_F_STABLE_PRIVACY);
3079                 else if (prefix_route)
3080                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3081         } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3082                 /* addrconf_add_linklocal also adds a prefix_route and we
3083                  * only need to care about prefix routes if ipv6_generate_eui64
3084                  * couldn't generate one.
3085                  */
3086                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3087                         addrconf_add_linklocal(idev, &addr, 0);
3088                 else if (prefix_route)
3089                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3090         }
3091 }
3092
3093 static void addrconf_dev_config(struct net_device *dev)
3094 {
3095         struct inet6_dev *idev;
3096
3097         ASSERT_RTNL();
3098
3099         if ((dev->type != ARPHRD_ETHER) &&
3100             (dev->type != ARPHRD_FDDI) &&
3101             (dev->type != ARPHRD_ARCNET) &&
3102             (dev->type != ARPHRD_INFINIBAND) &&
3103             (dev->type != ARPHRD_IEEE802154) &&
3104             (dev->type != ARPHRD_IEEE1394) &&
3105             (dev->type != ARPHRD_TUNNEL6) &&
3106             (dev->type != ARPHRD_6LOWPAN)) {
3107                 /* Alas, we support only Ethernet autoconfiguration. */
3108                 return;
3109         }
3110
3111         idev = addrconf_add_dev(dev);
3112         if (IS_ERR(idev))
3113                 return;
3114
3115         addrconf_addr_gen(idev, false);
3116 }
3117
3118 #if IS_ENABLED(CONFIG_IPV6_SIT)
3119 static void addrconf_sit_config(struct net_device *dev)
3120 {
3121         struct inet6_dev *idev;
3122
3123         ASSERT_RTNL();
3124
3125         /*
3126          * Configure the tunnel with one of our IPv4
3127          * addresses... we should configure all of
3128          * our v4 addrs in the tunnel
3129          */
3130
3131         idev = ipv6_find_idev(dev);
3132         if (!idev) {
3133                 pr_debug("%s: add_dev failed\n", __func__);
3134                 return;
3135         }
3136
3137         if (dev->priv_flags & IFF_ISATAP) {
3138                 addrconf_addr_gen(idev, false);
3139                 return;
3140         }
3141
3142         sit_add_v4_addrs(idev);
3143
3144         if (dev->flags&IFF_POINTOPOINT)
3145                 addrconf_add_mroute(dev);
3146 }
3147 #endif
3148
3149 #if IS_ENABLED(CONFIG_NET_IPGRE)
3150 static void addrconf_gre_config(struct net_device *dev)
3151 {
3152         struct inet6_dev *idev;
3153
3154         ASSERT_RTNL();
3155
3156         idev = ipv6_find_idev(dev);
3157         if (!idev) {
3158                 pr_debug("%s: add_dev failed\n", __func__);
3159                 return;
3160         }
3161
3162         addrconf_addr_gen(idev, true);
3163         if (dev->flags & IFF_POINTOPOINT)
3164                 addrconf_add_mroute(dev);
3165 }
3166 #endif
3167
3168 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3169                            void *ptr)
3170 {
3171         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3172         struct inet6_dev *idev = __in6_dev_get(dev);
3173         int run_pending = 0;
3174         int err;
3175
3176         switch (event) {
3177         case NETDEV_REGISTER:
3178                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3179                         idev = ipv6_add_dev(dev);
3180                         if (IS_ERR(idev))
3181                                 return notifier_from_errno(PTR_ERR(idev));
3182                 }
3183                 break;
3184
3185         case NETDEV_CHANGEMTU:
3186                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3187                 if (dev->mtu < IPV6_MIN_MTU) {
3188                         addrconf_ifdown(dev, 1);
3189                         break;
3190                 }
3191
3192                 if (idev) {
3193                         rt6_mtu_change(dev, dev->mtu);
3194                         idev->cnf.mtu6 = dev->mtu;
3195                         break;
3196                 }
3197
3198                 /* allocate new idev */
3199                 idev = ipv6_add_dev(dev);
3200                 if (IS_ERR(idev))
3201                         break;
3202
3203                 /* device is still not ready */
3204                 if (!(idev->if_flags & IF_READY))
3205                         break;
3206
3207                 run_pending = 1;
3208
3209                 /* fall through */
3210
3211         case NETDEV_UP:
3212         case NETDEV_CHANGE:
3213                 if (dev->flags & IFF_SLAVE)
3214                         break;
3215
3216                 if (idev && idev->cnf.disable_ipv6)
3217                         break;
3218
3219                 if (event == NETDEV_UP) {
3220                         if (!addrconf_qdisc_ok(dev)) {
3221                                 /* device is not ready yet. */
3222                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3223                                         dev->name);
3224                                 break;
3225                         }
3226
3227                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3228                                 idev = ipv6_add_dev(dev);
3229
3230                         if (!IS_ERR_OR_NULL(idev)) {
3231                                 idev->if_flags |= IF_READY;
3232                                 run_pending = 1;
3233                         }
3234                 } else if (event == NETDEV_CHANGE) {
3235                         if (!addrconf_qdisc_ok(dev)) {
3236                                 /* device is still not ready. */
3237                                 break;
3238                         }
3239
3240                         if (idev) {
3241                                 if (idev->if_flags & IF_READY)
3242                                         /* device is already configured. */
3243                                         break;
3244                                 idev->if_flags |= IF_READY;
3245                         }
3246
3247                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3248                                 dev->name);
3249
3250                         run_pending = 1;
3251                 }
3252
3253                 switch (dev->type) {
3254 #if IS_ENABLED(CONFIG_IPV6_SIT)
3255                 case ARPHRD_SIT:
3256                         addrconf_sit_config(dev);
3257                         break;
3258 #endif
3259 #if IS_ENABLED(CONFIG_NET_IPGRE)
3260                 case ARPHRD_IPGRE:
3261                         addrconf_gre_config(dev);
3262                         break;
3263 #endif
3264                 case ARPHRD_LOOPBACK:
3265                         init_loopback(dev);
3266                         break;
3267
3268                 default:
3269                         addrconf_dev_config(dev);
3270                         break;
3271                 }
3272
3273                 if (!IS_ERR_OR_NULL(idev)) {
3274                         if (run_pending)
3275                                 addrconf_dad_run(idev);
3276
3277                         /*
3278                          * If the MTU changed during the interface down,
3279                          * when the interface up, the changed MTU must be
3280                          * reflected in the idev as well as routers.
3281                          */
3282                         if (idev->cnf.mtu6 != dev->mtu &&
3283                             dev->mtu >= IPV6_MIN_MTU) {
3284                                 rt6_mtu_change(dev, dev->mtu);
3285                                 idev->cnf.mtu6 = dev->mtu;
3286                         }
3287                         idev->tstamp = jiffies;
3288                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3289
3290                         /*
3291                          * If the changed mtu during down is lower than
3292                          * IPV6_MIN_MTU stop IPv6 on this interface.
3293                          */
3294                         if (dev->mtu < IPV6_MIN_MTU)
3295                                 addrconf_ifdown(dev, 1);
3296                 }
3297                 break;
3298
3299         case NETDEV_DOWN:
3300         case NETDEV_UNREGISTER:
3301                 /*
3302                  *      Remove all addresses from this interface.
3303                  */
3304                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3305                 break;
3306
3307         case NETDEV_CHANGENAME:
3308                 if (idev) {
3309                         snmp6_unregister_dev(idev);
3310                         addrconf_sysctl_unregister(idev);
3311                         err = addrconf_sysctl_register(idev);
3312                         if (err)
3313                                 return notifier_from_errno(err);
3314                         err = snmp6_register_dev(idev);
3315                         if (err) {
3316                                 addrconf_sysctl_unregister(idev);
3317                                 return notifier_from_errno(err);
3318                         }
3319                 }
3320                 break;
3321
3322         case NETDEV_PRE_TYPE_CHANGE:
3323         case NETDEV_POST_TYPE_CHANGE:
3324                 addrconf_type_change(dev, event);
3325                 break;
3326         }
3327
3328         return NOTIFY_OK;
3329 }
3330
3331 /*
3332  *      addrconf module should be notified of a device going up
3333  */
3334 static struct notifier_block ipv6_dev_notf = {
3335         .notifier_call = addrconf_notify,
3336 };
3337
3338 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3339 {
3340         struct inet6_dev *idev;
3341         ASSERT_RTNL();
3342
3343         idev = __in6_dev_get(dev);
3344
3345         if (event == NETDEV_POST_TYPE_CHANGE)
3346                 ipv6_mc_remap(idev);
3347         else if (event == NETDEV_PRE_TYPE_CHANGE)
3348                 ipv6_mc_unmap(idev);
3349 }
3350
3351 static int addrconf_ifdown(struct net_device *dev, int how)
3352 {
3353         struct net *net = dev_net(dev);
3354         struct inet6_dev *idev;
3355         struct inet6_ifaddr *ifa;
3356         int state, i;
3357
3358         ASSERT_RTNL();
3359
3360         rt6_ifdown(net, dev);
3361         neigh_ifdown(&nd_tbl, dev);
3362
3363         idev = __in6_dev_get(dev);
3364         if (!idev)
3365                 return -ENODEV;
3366
3367         /*
3368          * Step 1: remove reference to ipv6 device from parent device.
3369          *         Do not dev_put!
3370          */
3371         if (how) {
3372                 idev->dead = 1;
3373
3374                 /* protected by rtnl_lock */
3375                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3376
3377                 /* Step 1.5: remove snmp6 entry */
3378                 snmp6_unregister_dev(idev);
3379
3380         }
3381
3382         /* Step 2: clear hash table */
3383         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3384                 struct hlist_head *h = &inet6_addr_lst[i];
3385
3386                 spin_lock_bh(&addrconf_hash_lock);
3387 restart:
3388                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3389                         if (ifa->idev == idev) {
3390                                 hlist_del_init_rcu(&ifa->addr_lst);
3391                                 addrconf_del_dad_work(ifa);
3392                                 goto restart;
3393                         }
3394                 }
3395                 spin_unlock_bh(&addrconf_hash_lock);
3396         }
3397
3398         write_lock_bh(&idev->lock);
3399
3400         addrconf_del_rs_timer(idev);
3401
3402         /* Step 2: clear flags for stateless addrconf */
3403         if (!how)
3404                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3405
3406         if (how && del_timer(&idev->regen_timer))
3407                 in6_dev_put(idev);
3408
3409         /* Step 3: clear tempaddr list */
3410         while (!list_empty(&idev->tempaddr_list)) {
3411                 ifa = list_first_entry(&idev->tempaddr_list,
3412                                        struct inet6_ifaddr, tmp_list);
3413                 list_del(&ifa->tmp_list);
3414                 write_unlock_bh(&idev->lock);
3415                 spin_lock_bh(&ifa->lock);
3416
3417                 if (ifa->ifpub) {
3418                         in6_ifa_put(ifa->ifpub);
3419                         ifa->ifpub = NULL;
3420                 }
3421                 spin_unlock_bh(&ifa->lock);
3422                 in6_ifa_put(ifa);
3423                 write_lock_bh(&idev->lock);
3424         }
3425
3426         while (!list_empty(&idev->addr_list)) {
3427                 ifa = list_first_entry(&idev->addr_list,
3428                                        struct inet6_ifaddr, if_list);
3429                 addrconf_del_dad_work(ifa);
3430
3431                 list_del(&ifa->if_list);
3432
3433                 write_unlock_bh(&idev->lock);
3434
3435                 spin_lock_bh(&ifa->lock);
3436                 state = ifa->state;
3437                 ifa->state = INET6_IFADDR_STATE_DEAD;
3438                 spin_unlock_bh(&ifa->lock);
3439
3440                 if (state != INET6_IFADDR_STATE_DEAD) {
3441                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3442                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3443                 }
3444                 in6_ifa_put(ifa);
3445
3446                 write_lock_bh(&idev->lock);
3447         }
3448
3449         write_unlock_bh(&idev->lock);
3450
3451         /* Step 5: Discard anycast and multicast list */
3452         if (how) {
3453                 ipv6_ac_destroy_dev(idev);
3454                 ipv6_mc_destroy_dev(idev);
3455         } else {
3456                 ipv6_mc_down(idev);
3457         }
3458
3459         idev->tstamp = jiffies;
3460
3461         /* Last: Shot the device (if unregistered) */
3462         if (how) {
3463                 addrconf_sysctl_unregister(idev);
3464                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3465                 neigh_ifdown(&nd_tbl, dev);
3466                 in6_dev_put(idev);
3467         }
3468         return 0;
3469 }
3470
3471 static void addrconf_rs_timer(unsigned long data)
3472 {
3473         struct inet6_dev *idev = (struct inet6_dev *)data;
3474         struct net_device *dev = idev->dev;
3475         struct in6_addr lladdr;
3476
3477         write_lock(&idev->lock);
3478         if (idev->dead || !(idev->if_flags & IF_READY))
3479                 goto out;
3480
3481         if (!ipv6_accept_ra(idev))
3482                 goto out;
3483
3484         /* Announcement received after solicitation was sent */
3485         if (idev->if_flags & IF_RA_RCVD)
3486                 goto out;
3487
3488         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3489                 write_unlock(&idev->lock);
3490                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3491                         ndisc_send_rs(dev, &lladdr,
3492                                       &in6addr_linklocal_allrouters);
3493                 else
3494                         goto put;
3495
3496                 write_lock(&idev->lock);
3497                 /* The wait after the last probe can be shorter */
3498                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3499                                              idev->cnf.rtr_solicits) ?
3500                                       idev->cnf.rtr_solicit_delay :
3501                                       idev->cnf.rtr_solicit_interval);
3502         } else {
3503                 /*
3504                  * Note: we do not support deprecated "all on-link"
3505                  * assumption any longer.
3506                  */
3507                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3508         }
3509
3510 out:
3511         write_unlock(&idev->lock);
3512 put:
3513         in6_dev_put(idev);
3514 }
3515
3516 /*
3517  *      Duplicate Address Detection
3518  */
3519 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3520 {
3521         unsigned long rand_num;
3522         struct inet6_dev *idev = ifp->idev;
3523
3524         if (ifp->flags & IFA_F_OPTIMISTIC)
3525                 rand_num = 0;
3526         else
3527                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3528
3529         ifp->dad_probes = idev->cnf.dad_transmits;
3530         addrconf_mod_dad_work(ifp, rand_num);
3531 }
3532
3533 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3534 {
3535         struct inet6_dev *idev = ifp->idev;
3536         struct net_device *dev = idev->dev;
3537         bool notify = false;
3538
3539         addrconf_join_solict(dev, &ifp->addr);
3540
3541         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3542
3543         read_lock_bh(&idev->lock);
3544         spin_lock(&ifp->lock);
3545         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3546                 goto out;
3547
3548         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3549             idev->cnf.accept_dad < 1 ||
3550             !(ifp->flags&IFA_F_TENTATIVE) ||
3551             ifp->flags & IFA_F_NODAD) {
3552                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3553                 spin_unlock(&ifp->lock);
3554                 read_unlock_bh(&idev->lock);
3555
3556                 addrconf_dad_completed(ifp);
3557                 return;
3558         }
3559
3560         if (!(idev->if_flags & IF_READY)) {
3561                 spin_unlock(&ifp->lock);
3562                 read_unlock_bh(&idev->lock);
3563                 /*
3564                  * If the device is not ready:
3565                  * - keep it tentative if it is a permanent address.
3566                  * - otherwise, kill it.
3567                  */
3568                 in6_ifa_hold(ifp);
3569                 addrconf_dad_stop(ifp, 0);
3570                 return;
3571         }
3572
3573         /*
3574          * Optimistic nodes can start receiving
3575          * Frames right away
3576          */
3577         if (ifp->flags & IFA_F_OPTIMISTIC) {
3578                 ip6_ins_rt(ifp->rt);
3579                 if (ipv6_use_optimistic_addr(idev)) {
3580                         /* Because optimistic nodes can use this address,
3581                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3582                          */
3583                         notify = true;
3584                 }
3585         }
3586
3587         addrconf_dad_kick(ifp);
3588 out:
3589         spin_unlock(&ifp->lock);
3590         read_unlock_bh(&idev->lock);
3591         if (notify)
3592                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3593 }
3594
3595 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3596 {
3597         bool begin_dad = false;
3598
3599         spin_lock_bh(&ifp->lock);
3600         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3601                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3602                 begin_dad = true;
3603         }
3604         spin_unlock_bh(&ifp->lock);
3605
3606         if (begin_dad)
3607                 addrconf_mod_dad_work(ifp, 0);
3608 }
3609
3610 static void addrconf_dad_work(struct work_struct *w)
3611 {
3612         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3613                                                 struct inet6_ifaddr,
3614                                                 dad_work);
3615         struct inet6_dev *idev = ifp->idev;
3616         struct in6_addr mcaddr;
3617
3618         enum {
3619                 DAD_PROCESS,
3620                 DAD_BEGIN,
3621                 DAD_ABORT,
3622         } action = DAD_PROCESS;
3623
3624         rtnl_lock();
3625
3626         spin_lock_bh(&ifp->lock);
3627         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3628                 action = DAD_BEGIN;
3629                 ifp->state = INET6_IFADDR_STATE_DAD;
3630         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3631                 action = DAD_ABORT;
3632                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3633         }
3634         spin_unlock_bh(&ifp->lock);
3635
3636         if (action == DAD_BEGIN) {
3637                 addrconf_dad_begin(ifp);
3638                 goto out;
3639         } else if (action == DAD_ABORT) {
3640                 in6_ifa_hold(ifp);
3641                 addrconf_dad_stop(ifp, 1);
3642                 goto out;
3643         }
3644
3645         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3646                 goto out;
3647
3648         write_lock_bh(&idev->lock);
3649         if (idev->dead || !(idev->if_flags & IF_READY)) {
3650                 write_unlock_bh(&idev->lock);
3651                 goto out;
3652         }
3653
3654         spin_lock(&ifp->lock);
3655         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3656                 spin_unlock(&ifp->lock);
3657                 write_unlock_bh(&idev->lock);
3658                 goto out;
3659         }
3660
3661         if (ifp->dad_probes == 0) {
3662                 /*
3663                  * DAD was successful
3664                  */
3665
3666                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3667                 spin_unlock(&ifp->lock);
3668                 write_unlock_bh(&idev->lock);
3669
3670                 addrconf_dad_completed(ifp);
3671
3672                 goto out;
3673         }
3674
3675         ifp->dad_probes--;
3676         addrconf_mod_dad_work(ifp,
3677                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3678         spin_unlock(&ifp->lock);
3679         write_unlock_bh(&idev->lock);
3680
3681         /* send a neighbour solicitation for our addr */
3682         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3683         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3684 out:
3685         in6_ifa_put(ifp);
3686         rtnl_unlock();
3687 }
3688
3689 /* ifp->idev must be at least read locked */
3690 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3691 {
3692         struct inet6_ifaddr *ifpiter;
3693         struct inet6_dev *idev = ifp->idev;
3694
3695         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3696                 if (ifpiter->scope > IFA_LINK)
3697                         break;
3698                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3699                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3700                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3701                     IFA_F_PERMANENT)
3702                         return false;
3703         }
3704         return true;
3705 }
3706
3707 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3708 {
3709         struct net_device *dev = ifp->idev->dev;
3710         struct in6_addr lladdr;
3711         bool send_rs, send_mld;
3712
3713         addrconf_del_dad_work(ifp);
3714
3715         /*
3716          *      Configure the address for reception. Now it is valid.
3717          */
3718
3719         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3720
3721         /* If added prefix is link local and we are prepared to process
3722            router advertisements, start sending router solicitations.
3723          */
3724
3725         read_lock_bh(&ifp->idev->lock);
3726         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3727         send_rs = send_mld &&
3728                   ipv6_accept_ra(ifp->idev) &&
3729                   ifp->idev->cnf.rtr_solicits > 0 &&
3730                   (dev->flags&IFF_LOOPBACK) == 0;
3731         read_unlock_bh(&ifp->idev->lock);
3732
3733         /* While dad is in progress mld report's source address is in6_addrany.
3734          * Resend with proper ll now.
3735          */
3736         if (send_mld)
3737                 ipv6_mc_dad_complete(ifp->idev);
3738
3739         if (send_rs) {
3740                 /*
3741                  *      If a host as already performed a random delay
3742                  *      [...] as part of DAD [...] there is no need
3743                  *      to delay again before sending the first RS
3744                  */
3745                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3746                         return;
3747                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3748
3749                 write_lock_bh(&ifp->idev->lock);
3750                 spin_lock(&ifp->lock);
3751                 ifp->idev->rs_probes = 1;
3752                 ifp->idev->if_flags |= IF_RS_SENT;
3753                 addrconf_mod_rs_timer(ifp->idev,
3754                                       ifp->idev->cnf.rtr_solicit_interval);
3755                 spin_unlock(&ifp->lock);
3756                 write_unlock_bh(&ifp->idev->lock);
3757         }
3758 }
3759
3760 static void addrconf_dad_run(struct inet6_dev *idev)
3761 {
3762         struct inet6_ifaddr *ifp;
3763
3764         read_lock_bh(&idev->lock);
3765         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3766                 spin_lock(&ifp->lock);
3767                 if (ifp->flags & IFA_F_TENTATIVE &&
3768                     ifp->state == INET6_IFADDR_STATE_DAD)
3769                         addrconf_dad_kick(ifp);
3770                 spin_unlock(&ifp->lock);
3771         }
3772         read_unlock_bh(&idev->lock);
3773 }
3774
3775 #ifdef CONFIG_PROC_FS
3776 struct if6_iter_state {
3777         struct seq_net_private p;
3778         int bucket;
3779         int offset;
3780 };
3781
3782 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3783 {
3784         struct inet6_ifaddr *ifa = NULL;
3785         struct if6_iter_state *state = seq->private;
3786         struct net *net = seq_file_net(seq);
3787         int p = 0;
3788
3789         /* initial bucket if pos is 0 */
3790         if (pos == 0) {
3791                 state->bucket = 0;
3792                 state->offset = 0;
3793         }
3794
3795         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3796                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3797                                          addr_lst) {
3798                         if (!net_eq(dev_net(ifa->idev->dev), net))
3799                                 continue;
3800                         /* sync with offset */
3801                         if (p < state->offset) {
3802                                 p++;
3803                                 continue;
3804                         }
3805                         state->offset++;
3806                         return ifa;
3807                 }
3808
3809                 /* prepare for next bucket */
3810                 state->offset = 0;
3811                 p = 0;
3812         }
3813         return NULL;
3814 }
3815
3816 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3817                                          struct inet6_ifaddr *ifa)
3818 {
3819         struct if6_iter_state *state = seq->private;
3820         struct net *net = seq_file_net(seq);
3821
3822         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3823                 if (!net_eq(dev_net(ifa->idev->dev), net))
3824                         continue;
3825                 state->offset++;
3826                 return ifa;
3827         }
3828
3829         while (++state->bucket < IN6_ADDR_HSIZE) {
3830                 state->offset = 0;
3831                 hlist_for_each_entry_rcu_bh(ifa,
3832                                      &inet6_addr_lst[state->bucket], addr_lst) {
3833                         if (!net_eq(dev_net(ifa->idev->dev), net))
3834                                 continue;
3835                         state->offset++;
3836                         return ifa;
3837                 }
3838         }
3839
3840         return NULL;
3841 }
3842
3843 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3844         __acquires(rcu_bh)
3845 {
3846         rcu_read_lock_bh();
3847         return if6_get_first(seq, *pos);
3848 }
3849
3850 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3851 {
3852         struct inet6_ifaddr *ifa;
3853
3854         ifa = if6_get_next(seq, v);
3855         ++*pos;
3856         return ifa;
3857 }
3858
3859 static void if6_seq_stop(struct seq_file *seq, void *v)
3860         __releases(rcu_bh)
3861 {
3862         rcu_read_unlock_bh();
3863 }
3864
3865 static int if6_seq_show(struct seq_file *seq, void *v)
3866 {
3867         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3868         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3869                    &ifp->addr,
3870                    ifp->idev->dev->ifindex,
3871                    ifp->prefix_len,
3872                    ifp->scope,
3873                    (u8) ifp->flags,
3874                    ifp->idev->dev->name);
3875         return 0;
3876 }
3877
3878 static const struct seq_operations if6_seq_ops = {
3879         .start  = if6_seq_start,
3880         .next   = if6_seq_next,
3881         .show   = if6_seq_show,
3882         .stop   = if6_seq_stop,
3883 };
3884
3885 static int if6_seq_open(struct inode *inode, struct file *file)
3886 {
3887         return seq_open_net(inode, file, &if6_seq_ops,
3888                             sizeof(struct if6_iter_state));
3889 }
3890
3891 static const struct file_operations if6_fops = {
3892         .owner          = THIS_MODULE,
3893         .open           = if6_seq_open,
3894         .read           = seq_read,
3895         .llseek         = seq_lseek,
3896         .release        = seq_release_net,
3897 };
3898
3899 static int __net_init if6_proc_net_init(struct net *net)
3900 {
3901         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3902                 return -ENOMEM;
3903         return 0;
3904 }
3905
3906 static void __net_exit if6_proc_net_exit(struct net *net)
3907 {
3908         remove_proc_entry("if_inet6", net->proc_net);
3909 }
3910
3911 static struct pernet_operations if6_proc_net_ops = {
3912         .init = if6_proc_net_init,
3913         .exit = if6_proc_net_exit,
3914 };
3915
3916 int __init if6_proc_init(void)
3917 {
3918         return register_pernet_subsys(&if6_proc_net_ops);
3919 }
3920
3921 void if6_proc_exit(void)
3922 {
3923         unregister_pernet_subsys(&if6_proc_net_ops);
3924 }
3925 #endif  /* CONFIG_PROC_FS */
3926
3927 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3928 /* Check if address is a home address configured on any interface. */
3929 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3930 {
3931         int ret = 0;
3932         struct inet6_ifaddr *ifp = NULL;
3933         unsigned int hash = inet6_addr_hash(addr);
3934
3935         rcu_read_lock_bh();
3936         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3937                 if (!net_eq(dev_net(ifp->idev->dev), net))
3938                         continue;
3939                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3940                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3941                         ret = 1;
3942                         break;
3943                 }
3944         }
3945         rcu_read_unlock_bh();
3946         return ret;
3947 }
3948 #endif
3949
3950 /*
3951  *      Periodic address status verification
3952  */
3953
3954 static void addrconf_verify_rtnl(void)
3955 {
3956         unsigned long now, next, next_sec, next_sched;
3957         struct inet6_ifaddr *ifp;
3958         int i;
3959
3960         ASSERT_RTNL();
3961
3962         rcu_read_lock_bh();
3963         now = jiffies;
3964         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3965
3966         cancel_delayed_work(&addr_chk_work);
3967
3968         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3969 restart:
3970                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3971                         unsigned long age;
3972
3973                         /* When setting preferred_lft to a value not zero or
3974                          * infinity, while valid_lft is infinity
3975                          * IFA_F_PERMANENT has a non-infinity life time.
3976                          */
3977                         if ((ifp->flags & IFA_F_PERMANENT) &&
3978                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
3979                                 continue;
3980
3981                         spin_lock(&ifp->lock);
3982                         /* We try to batch several events at once. */
3983                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3984
3985                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3986                             age >= ifp->valid_lft) {
3987                                 spin_unlock(&ifp->lock);
3988                                 in6_ifa_hold(ifp);
3989                                 ipv6_del_addr(ifp);
3990                                 goto restart;
3991                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3992                                 spin_unlock(&ifp->lock);
3993                                 continue;
3994                         } else if (age >= ifp->prefered_lft) {
3995                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3996                                 int deprecate = 0;
3997
3998                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3999                                         deprecate = 1;
4000                                         ifp->flags |= IFA_F_DEPRECATED;
4001                                 }
4002
4003                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4004                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4005                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4006
4007                                 spin_unlock(&ifp->lock);
4008
4009                                 if (deprecate) {
4010                                         in6_ifa_hold(ifp);
4011
4012                                         ipv6_ifa_notify(0, ifp);
4013                                         in6_ifa_put(ifp);
4014                                         goto restart;
4015                                 }
4016                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4017                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4018                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4019                                         ifp->idev->cnf.dad_transmits *
4020                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4021
4022                                 if (age >= ifp->prefered_lft - regen_advance) {
4023                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4024                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4025                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4026                                         if (!ifp->regen_count && ifpub) {
4027                                                 ifp->regen_count++;
4028                                                 in6_ifa_hold(ifp);
4029                                                 in6_ifa_hold(ifpub);
4030                                                 spin_unlock(&ifp->lock);
4031
4032                                                 spin_lock(&ifpub->lock);
4033                                                 ifpub->regen_count = 0;
4034                                                 spin_unlock(&ifpub->lock);
4035                                                 ipv6_create_tempaddr(ifpub, ifp);
4036                                                 in6_ifa_put(ifpub);
4037                                                 in6_ifa_put(ifp);
4038                                                 goto restart;
4039                                         }
4040                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4041                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4042                                 spin_unlock(&ifp->lock);
4043                         } else {
4044                                 /* ifp->prefered_lft <= ifp->valid_lft */
4045                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4046                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4047                                 spin_unlock(&ifp->lock);
4048                         }
4049                 }
4050         }
4051
4052         next_sec = round_jiffies_up(next);
4053         next_sched = next;
4054
4055         /* If rounded timeout is accurate enough, accept it. */
4056         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4057                 next_sched = next_sec;
4058
4059         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4060         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4061                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4062
4063         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4064               now, next, next_sec, next_sched);
4065         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4066         rcu_read_unlock_bh();
4067 }
4068
4069 static void addrconf_verify_work(struct work_struct *w)
4070 {
4071         rtnl_lock();
4072         addrconf_verify_rtnl();
4073         rtnl_unlock();
4074 }
4075
4076 static void addrconf_verify(void)
4077 {
4078         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4079 }
4080
4081 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4082                                      struct in6_addr **peer_pfx)
4083 {
4084         struct in6_addr *pfx = NULL;
4085
4086         *peer_pfx = NULL;
4087
4088         if (addr)
4089                 pfx = nla_data(addr);
4090
4091         if (local) {
4092                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4093                         *peer_pfx = pfx;
4094                 pfx = nla_data(local);
4095         }
4096
4097         return pfx;
4098 }
4099
4100 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4101         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4102         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4103         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4104         [IFA_FLAGS]             = { .len = sizeof(u32) },
4105 };
4106
4107 static int
4108 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4109 {
4110         struct net *net = sock_net(skb->sk);
4111         struct ifaddrmsg *ifm;
4112         struct nlattr *tb[IFA_MAX+1];
4113         struct in6_addr *pfx, *peer_pfx;
4114         u32 ifa_flags;
4115         int err;
4116
4117         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4118         if (err < 0)
4119                 return err;
4120
4121         ifm = nlmsg_data(nlh);
4122         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4123         if (!pfx)
4124                 return -EINVAL;
4125
4126         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4127
4128         /* We ignore other flags so far. */
4129         ifa_flags &= IFA_F_MANAGETEMPADDR;
4130
4131         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4132                               ifm->ifa_prefixlen);
4133 }
4134
4135 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4136                              u32 prefered_lft, u32 valid_lft)
4137 {
4138         u32 flags;
4139         clock_t expires;
4140         unsigned long timeout;
4141         bool was_managetempaddr;
4142         bool had_prefixroute;
4143
4144         ASSERT_RTNL();
4145
4146         if (!valid_lft || (prefered_lft > valid_lft))
4147                 return -EINVAL;
4148
4149         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4150             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4151                 return -EINVAL;
4152
4153         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4154         if (addrconf_finite_timeout(timeout)) {
4155                 expires = jiffies_to_clock_t(timeout * HZ);
4156                 valid_lft = timeout;
4157                 flags = RTF_EXPIRES;
4158         } else {
4159                 expires = 0;
4160                 flags = 0;
4161                 ifa_flags |= IFA_F_PERMANENT;
4162         }
4163
4164         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4165         if (addrconf_finite_timeout(timeout)) {
4166                 if (timeout == 0)
4167                         ifa_flags |= IFA_F_DEPRECATED;
4168                 prefered_lft = timeout;
4169         }
4170
4171         spin_lock_bh(&ifp->lock);
4172         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4173         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4174                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4175         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4176                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4177                         IFA_F_NOPREFIXROUTE);
4178         ifp->flags |= ifa_flags;
4179         ifp->tstamp = jiffies;
4180         ifp->valid_lft = valid_lft;
4181         ifp->prefered_lft = prefered_lft;
4182
4183         spin_unlock_bh(&ifp->lock);
4184         if (!(ifp->flags&IFA_F_TENTATIVE))
4185                 ipv6_ifa_notify(0, ifp);
4186
4187         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4188                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4189                                       expires, flags);
4190         } else if (had_prefixroute) {
4191                 enum cleanup_prefix_rt_t action;
4192                 unsigned long rt_expires;
4193
4194                 write_lock_bh(&ifp->idev->lock);
4195                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4196                 write_unlock_bh(&ifp->idev->lock);
4197
4198                 if (action != CLEANUP_PREFIX_RT_NOP) {
4199                         cleanup_prefix_route(ifp, rt_expires,
4200                                 action == CLEANUP_PREFIX_RT_DEL);
4201                 }
4202         }
4203
4204         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4205                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4206                         valid_lft = prefered_lft = 0;
4207                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4208                                  !was_managetempaddr, jiffies);
4209         }
4210
4211         addrconf_verify_rtnl();
4212
4213         return 0;
4214 }
4215
4216 static int
4217 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4218 {
4219         struct net *net = sock_net(skb->sk);
4220         struct ifaddrmsg *ifm;
4221         struct nlattr *tb[IFA_MAX+1];
4222         struct in6_addr *pfx, *peer_pfx;
4223         struct inet6_ifaddr *ifa;
4224         struct net_device *dev;
4225         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4226         u32 ifa_flags;
4227         int err;
4228
4229         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4230         if (err < 0)
4231                 return err;
4232
4233         ifm = nlmsg_data(nlh);
4234         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4235         if (!pfx)
4236                 return -EINVAL;
4237
4238         if (tb[IFA_CACHEINFO]) {
4239                 struct ifa_cacheinfo *ci;
4240
4241                 ci = nla_data(tb[IFA_CACHEINFO]);
4242                 valid_lft = ci->ifa_valid;
4243                 preferred_lft = ci->ifa_prefered;
4244         } else {
4245                 preferred_lft = INFINITY_LIFE_TIME;
4246                 valid_lft = INFINITY_LIFE_TIME;
4247         }
4248
4249         dev =  __dev_get_by_index(net, ifm->ifa_index);
4250         if (!dev)
4251                 return -ENODEV;
4252
4253         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4254
4255         /* We ignore other flags so far. */
4256         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4257                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4258
4259         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4260         if (!ifa) {
4261                 /*
4262                  * It would be best to check for !NLM_F_CREATE here but
4263                  * userspace already relies on not having to provide this.
4264                  */
4265                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4266                                       ifm->ifa_prefixlen, ifa_flags,
4267                                       preferred_lft, valid_lft);
4268         }
4269
4270         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4271             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4272                 err = -EEXIST;
4273         else
4274                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4275
4276         in6_ifa_put(ifa);
4277
4278         return err;
4279 }
4280
4281 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4282                           u8 scope, int ifindex)
4283 {
4284         struct ifaddrmsg *ifm;
4285
4286         ifm = nlmsg_data(nlh);
4287         ifm->ifa_family = AF_INET6;
4288         ifm->ifa_prefixlen = prefixlen;
4289         ifm->ifa_flags = flags;
4290         ifm->ifa_scope = scope;
4291         ifm->ifa_index = ifindex;
4292 }
4293
4294 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4295                          unsigned long tstamp, u32 preferred, u32 valid)
4296 {
4297         struct ifa_cacheinfo ci;
4298
4299         ci.cstamp = cstamp_delta(cstamp);
4300         ci.tstamp = cstamp_delta(tstamp);
4301         ci.ifa_prefered = preferred;
4302         ci.ifa_valid = valid;
4303
4304         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4305 }
4306
4307 static inline int rt_scope(int ifa_scope)
4308 {
4309         if (ifa_scope & IFA_HOST)
4310                 return RT_SCOPE_HOST;
4311         else if (ifa_scope & IFA_LINK)
4312                 return RT_SCOPE_LINK;
4313         else if (ifa_scope & IFA_SITE)
4314                 return RT_SCOPE_SITE;
4315         else
4316                 return RT_SCOPE_UNIVERSE;
4317 }
4318
4319 static inline int inet6_ifaddr_msgsize(void)
4320 {
4321         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4322                + nla_total_size(16) /* IFA_LOCAL */
4323                + nla_total_size(16) /* IFA_ADDRESS */
4324                + nla_total_size(sizeof(struct ifa_cacheinfo))
4325                + nla_total_size(4)  /* IFA_FLAGS */;
4326 }
4327
4328 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4329                              u32 portid, u32 seq, int event, unsigned int flags)
4330 {
4331         struct nlmsghdr  *nlh;
4332         u32 preferred, valid;
4333
4334         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4335         if (!nlh)
4336                 return -EMSGSIZE;
4337
4338         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4339                       ifa->idev->dev->ifindex);
4340
4341         if (!((ifa->flags&IFA_F_PERMANENT) &&
4342               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4343                 preferred = ifa->prefered_lft;
4344                 valid = ifa->valid_lft;
4345                 if (preferred != INFINITY_LIFE_TIME) {
4346                         long tval = (jiffies - ifa->tstamp)/HZ;
4347                         if (preferred > tval)
4348                                 preferred -= tval;
4349                         else
4350                                 preferred = 0;
4351                         if (valid != INFINITY_LIFE_TIME) {
4352                                 if (valid > tval)
4353                                         valid -= tval;
4354                                 else
4355                                         valid = 0;
4356                         }
4357                 }
4358         } else {
4359                 preferred = INFINITY_LIFE_TIME;
4360                 valid = INFINITY_LIFE_TIME;
4361         }
4362
4363         if (!ipv6_addr_any(&ifa->peer_addr)) {
4364                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4365                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4366                         goto error;
4367         } else
4368                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4369                         goto error;
4370
4371         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4372                 goto error;
4373
4374         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4375                 goto error;
4376
4377         nlmsg_end(skb, nlh);
4378         return 0;
4379
4380 error:
4381         nlmsg_cancel(skb, nlh);
4382         return -EMSGSIZE;
4383 }
4384
4385 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4386                                 u32 portid, u32 seq, int event, u16 flags)
4387 {
4388         struct nlmsghdr  *nlh;
4389         u8 scope = RT_SCOPE_UNIVERSE;
4390         int ifindex = ifmca->idev->dev->ifindex;
4391
4392         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4393                 scope = RT_SCOPE_SITE;
4394
4395         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4396         if (!nlh)
4397                 return -EMSGSIZE;
4398
4399         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4400         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4401             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4402                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4403                 nlmsg_cancel(skb, nlh);
4404                 return -EMSGSIZE;
4405         }
4406
4407         nlmsg_end(skb, nlh);
4408         return 0;
4409 }
4410
4411 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4412                                 u32 portid, u32 seq, int event, unsigned int flags)
4413 {
4414         struct nlmsghdr  *nlh;
4415         u8 scope = RT_SCOPE_UNIVERSE;
4416         int ifindex = ifaca->aca_idev->dev->ifindex;
4417
4418         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4419                 scope = RT_SCOPE_SITE;
4420
4421         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4422         if (!nlh)
4423                 return -EMSGSIZE;
4424
4425         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4426         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4427             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4428                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4429                 nlmsg_cancel(skb, nlh);
4430                 return -EMSGSIZE;
4431         }
4432
4433         nlmsg_end(skb, nlh);
4434         return 0;
4435 }
4436
4437 enum addr_type_t {
4438         UNICAST_ADDR,
4439         MULTICAST_ADDR,
4440         ANYCAST_ADDR,
4441 };
4442
4443 /* called with rcu_read_lock() */
4444 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4445                           struct netlink_callback *cb, enum addr_type_t type,
4446                           int s_ip_idx, int *p_ip_idx)
4447 {
4448         struct ifmcaddr6 *ifmca;
4449         struct ifacaddr6 *ifaca;
4450         int err = 1;
4451         int ip_idx = *p_ip_idx;
4452
4453         read_lock_bh(&idev->lock);
4454         switch (type) {
4455         case UNICAST_ADDR: {
4456                 struct inet6_ifaddr *ifa;
4457
4458                 /* unicast address incl. temp addr */
4459                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4460                         if (++ip_idx < s_ip_idx)
4461                                 continue;
4462                         err = inet6_fill_ifaddr(skb, ifa,
4463                                                 NETLINK_CB(cb->skb).portid,
4464                                                 cb->nlh->nlmsg_seq,
4465                                                 RTM_NEWADDR,
4466                                                 NLM_F_MULTI);
4467                         if (err < 0)
4468                                 break;
4469                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4470                 }
4471                 break;
4472         }
4473         case MULTICAST_ADDR:
4474                 /* multicast address */
4475                 for (ifmca = idev->mc_list; ifmca;
4476                      ifmca = ifmca->next, ip_idx++) {
4477                         if (ip_idx < s_ip_idx)
4478                                 continue;
4479                         err = inet6_fill_ifmcaddr(skb, ifmca,
4480                                                   NETLINK_CB(cb->skb).portid,
4481                                                   cb->nlh->nlmsg_seq,
4482                                                   RTM_GETMULTICAST,
4483                                                   NLM_F_MULTI);
4484                         if (err < 0)
4485                                 break;
4486                 }
4487                 break;
4488         case ANYCAST_ADDR:
4489                 /* anycast address */
4490                 for (ifaca = idev->ac_list; ifaca;
4491                      ifaca = ifaca->aca_next, ip_idx++) {
4492                         if (ip_idx < s_ip_idx)
4493                                 continue;
4494                         err = inet6_fill_ifacaddr(skb, ifaca,
4495                                                   NETLINK_CB(cb->skb).portid,
4496                                                   cb->nlh->nlmsg_seq,
4497                                                   RTM_GETANYCAST,
4498                                                   NLM_F_MULTI);
4499                         if (err < 0)
4500                                 break;
4501                 }
4502                 break;
4503         default:
4504                 break;
4505         }
4506         read_unlock_bh(&idev->lock);
4507         *p_ip_idx = ip_idx;
4508         return err;
4509 }
4510
4511 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4512                            enum addr_type_t type)
4513 {
4514         struct net *net = sock_net(skb->sk);
4515         int h, s_h;
4516         int idx, ip_idx;
4517         int s_idx, s_ip_idx;
4518         struct net_device *dev;
4519         struct inet6_dev *idev;
4520         struct hlist_head *head;
4521
4522         s_h = cb->args[0];
4523         s_idx = idx = cb->args[1];
4524         s_ip_idx = ip_idx = cb->args[2];
4525
4526         rcu_read_lock();
4527         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4528         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4529                 idx = 0;
4530                 head = &net->dev_index_head[h];
4531                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4532                         if (idx < s_idx)
4533                                 goto cont;
4534                         if (h > s_h || idx > s_idx)
4535                                 s_ip_idx = 0;
4536                         ip_idx = 0;
4537                         idev = __in6_dev_get(dev);
4538                         if (!idev)
4539                                 goto cont;
4540
4541                         if (in6_dump_addrs(idev, skb, cb, type,
4542                                            s_ip_idx, &ip_idx) < 0)
4543                                 goto done;
4544 cont:
4545                         idx++;
4546                 }
4547         }
4548 done:
4549         rcu_read_unlock();
4550         cb->args[0] = h;
4551         cb->args[1] = idx;
4552         cb->args[2] = ip_idx;
4553
4554         return skb->len;
4555 }
4556
4557 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4558 {
4559         enum addr_type_t type = UNICAST_ADDR;
4560
4561         return inet6_dump_addr(skb, cb, type);
4562 }
4563
4564 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4565 {
4566         enum addr_type_t type = MULTICAST_ADDR;
4567
4568         return inet6_dump_addr(skb, cb, type);
4569 }
4570
4571
4572 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4573 {
4574         enum addr_type_t type = ANYCAST_ADDR;
4575
4576         return inet6_dump_addr(skb, cb, type);
4577 }
4578
4579 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4580 {
4581         struct net *net = sock_net(in_skb->sk);
4582         struct ifaddrmsg *ifm;
4583         struct nlattr *tb[IFA_MAX+1];
4584         struct in6_addr *addr = NULL, *peer;
4585         struct net_device *dev = NULL;
4586         struct inet6_ifaddr *ifa;
4587         struct sk_buff *skb;
4588         int err;
4589
4590         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4591         if (err < 0)
4592                 goto errout;
4593
4594         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4595         if (!addr) {
4596                 err = -EINVAL;
4597                 goto errout;
4598         }
4599
4600         ifm = nlmsg_data(nlh);
4601         if (ifm->ifa_index)
4602                 dev = __dev_get_by_index(net, ifm->ifa_index);
4603
4604         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4605         if (!ifa) {
4606                 err = -EADDRNOTAVAIL;
4607                 goto errout;
4608         }
4609
4610         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4611         if (!skb) {
4612                 err = -ENOBUFS;
4613                 goto errout_ifa;
4614         }
4615
4616         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4617                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4618         if (err < 0) {
4619                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4620                 WARN_ON(err == -EMSGSIZE);
4621                 kfree_skb(skb);
4622                 goto errout_ifa;
4623         }
4624         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4625 errout_ifa:
4626         in6_ifa_put(ifa);
4627 errout:
4628         return err;
4629 }
4630
4631 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4632 {
4633         struct sk_buff *skb;
4634         struct net *net = dev_net(ifa->idev->dev);
4635         int err = -ENOBUFS;
4636
4637         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4638         if (!skb)
4639                 goto errout;
4640
4641         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4642         if (err < 0) {
4643                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4644                 WARN_ON(err == -EMSGSIZE);
4645                 kfree_skb(skb);
4646                 goto errout;
4647         }
4648         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4649         return;
4650 errout:
4651         if (err < 0)
4652                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4653 }
4654
4655 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4656                                 __s32 *array, int bytes)
4657 {
4658         BUG_ON(bytes < (DEVCONF_MAX * 4));
4659
4660         memset(array, 0, bytes);
4661         array[DEVCONF_FORWARDING] = cnf->forwarding;
4662         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4663         array[DEVCONF_MTU6] = cnf->mtu6;
4664         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4665         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4666         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4667         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4668         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4669         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4670                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4671         array[DEVCONF_RTR_SOLICIT_DELAY] =
4672                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4673         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4674         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4675                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4676         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4677                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4678         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4679         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4680         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4681         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4682         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4683         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4684         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4685         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4686         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4687 #ifdef CONFIG_IPV6_ROUTER_PREF
4688         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4689         array[DEVCONF_RTR_PROBE_INTERVAL] =
4690                 jiffies_to_msecs(cnf->rtr_probe_interval);
4691 #ifdef CONFIG_IPV6_ROUTE_INFO
4692         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4693 #endif
4694 #endif
4695         array[DEVCONF_ACCEPT_RA_RT_TABLE] = cnf->accept_ra_rt_table;
4696         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4697         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4698 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4699         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4700         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4701 #endif
4702 #ifdef CONFIG_IPV6_MROUTE
4703         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4704 #endif
4705         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4706         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4707         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4708         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4709         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4710         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4711         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4712         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4713         /* we omit DEVCONF_STABLE_SECRET for now */
4714         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4715 }
4716
4717 static inline size_t inet6_ifla6_size(void)
4718 {
4719         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4720              + nla_total_size(sizeof(struct ifla_cacheinfo))
4721              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4722              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4723              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4724              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4725 }
4726
4727 static inline size_t inet6_if_nlmsg_size(void)
4728 {
4729         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4730                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4731                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4732                + nla_total_size(4) /* IFLA_MTU */
4733                + nla_total_size(4) /* IFLA_LINK */
4734                + nla_total_size(1) /* IFLA_OPERSTATE */
4735                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4736 }
4737
4738 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4739                                       int items, int bytes)
4740 {
4741         int i;
4742         int pad = bytes - sizeof(u64) * items;
4743         BUG_ON(pad < 0);
4744
4745         /* Use put_unaligned() because stats may not be aligned for u64. */
4746         put_unaligned(items, &stats[0]);
4747         for (i = 1; i < items; i++)
4748                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4749
4750         memset(&stats[items], 0, pad);
4751 }
4752
4753 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4754                                         int bytes, size_t syncpoff)
4755 {
4756         int i, c;
4757         u64 buff[IPSTATS_MIB_MAX];
4758         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4759
4760         BUG_ON(pad < 0);
4761
4762         memset(buff, 0, sizeof(buff));
4763         buff[0] = IPSTATS_MIB_MAX;
4764
4765         for_each_possible_cpu(c) {
4766                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4767                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4768         }
4769
4770         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4771         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4772 }
4773
4774 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4775                              int bytes)
4776 {
4777         switch (attrtype) {
4778         case IFLA_INET6_STATS:
4779                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4780                                      offsetof(struct ipstats_mib, syncp));
4781                 break;
4782         case IFLA_INET6_ICMP6STATS:
4783                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4784                 break;
4785         }
4786 }
4787
4788 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4789                                   u32 ext_filter_mask)
4790 {
4791         struct nlattr *nla;
4792         struct ifla_cacheinfo ci;
4793
4794         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4795                 goto nla_put_failure;
4796         ci.max_reasm_len = IPV6_MAXPLEN;
4797         ci.tstamp = cstamp_delta(idev->tstamp);
4798         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4799         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4800         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4801                 goto nla_put_failure;
4802         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4803         if (!nla)
4804                 goto nla_put_failure;
4805         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4806
4807         /* XXX - MC not implemented */
4808
4809         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4810                 return 0;
4811
4812         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4813         if (!nla)
4814                 goto nla_put_failure;
4815         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4816
4817         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4818         if (!nla)
4819                 goto nla_put_failure;
4820         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4821
4822         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4823         if (!nla)
4824                 goto nla_put_failure;
4825
4826         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4827                 goto nla_put_failure;
4828
4829         read_lock_bh(&idev->lock);
4830         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4831         read_unlock_bh(&idev->lock);
4832
4833         return 0;
4834
4835 nla_put_failure:
4836         return -EMSGSIZE;
4837 }
4838
4839 static size_t inet6_get_link_af_size(const struct net_device *dev,
4840                                      u32 ext_filter_mask)
4841 {
4842         if (!__in6_dev_get(dev))
4843                 return 0;
4844
4845         return inet6_ifla6_size();
4846 }
4847
4848 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4849                               u32 ext_filter_mask)
4850 {
4851         struct inet6_dev *idev = __in6_dev_get(dev);
4852
4853         if (!idev)
4854                 return -ENODATA;
4855
4856         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4857                 return -EMSGSIZE;
4858
4859         return 0;
4860 }
4861
4862 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4863 {
4864         struct inet6_ifaddr *ifp;
4865         struct net_device *dev = idev->dev;
4866         bool update_rs = false;
4867         struct in6_addr ll_addr;
4868
4869         ASSERT_RTNL();
4870
4871         if (!token)
4872                 return -EINVAL;
4873         if (ipv6_addr_any(token))
4874                 return -EINVAL;
4875         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4876                 return -EINVAL;
4877         if (!ipv6_accept_ra(idev))
4878                 return -EINVAL;
4879         if (idev->cnf.rtr_solicits <= 0)
4880                 return -EINVAL;
4881
4882         write_lock_bh(&idev->lock);
4883
4884         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4885         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4886
4887         write_unlock_bh(&idev->lock);
4888
4889         if (!idev->dead && (idev->if_flags & IF_READY) &&
4890             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4891                              IFA_F_OPTIMISTIC)) {
4892
4893                 /* If we're not ready, then normal ifup will take care
4894                  * of this. Otherwise, we need to request our rs here.
4895                  */
4896                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4897                 update_rs = true;
4898         }
4899
4900         write_lock_bh(&idev->lock);
4901
4902         if (update_rs) {
4903                 idev->if_flags |= IF_RS_SENT;
4904                 idev->rs_probes = 1;
4905                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4906         }
4907
4908         /* Well, that's kinda nasty ... */
4909         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4910                 spin_lock(&ifp->lock);
4911                 if (ifp->tokenized) {
4912                         ifp->valid_lft = 0;
4913                         ifp->prefered_lft = 0;
4914                 }
4915                 spin_unlock(&ifp->lock);
4916         }
4917
4918         write_unlock_bh(&idev->lock);
4919         inet6_ifinfo_notify(RTM_NEWLINK, idev);
4920         addrconf_verify_rtnl();
4921         return 0;
4922 }
4923
4924 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4925         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
4926         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
4927 };
4928
4929 static int inet6_validate_link_af(const struct net_device *dev,
4930                                   const struct nlattr *nla)
4931 {
4932         struct nlattr *tb[IFLA_INET6_MAX + 1];
4933
4934         if (dev && !__in6_dev_get(dev))
4935                 return -EAFNOSUPPORT;
4936
4937         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4938 }
4939
4940 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4941 {
4942         int err = -EINVAL;
4943         struct inet6_dev *idev = __in6_dev_get(dev);
4944         struct nlattr *tb[IFLA_INET6_MAX + 1];
4945
4946         if (!idev)
4947                 return -EAFNOSUPPORT;
4948
4949         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4950                 BUG();
4951
4952         if (tb[IFLA_INET6_TOKEN]) {
4953                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4954                 if (err)
4955                         return err;
4956         }
4957
4958         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4959                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4960
4961                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4962                     mode != IN6_ADDR_GEN_MODE_NONE &&
4963                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4964                         return -EINVAL;
4965
4966                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4967                     !idev->cnf.stable_secret.initialized &&
4968                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4969                         return -EINVAL;
4970
4971                 idev->addr_gen_mode = mode;
4972                 err = 0;
4973         }
4974
4975         return err;
4976 }
4977
4978 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4979                              u32 portid, u32 seq, int event, unsigned int flags)
4980 {
4981         struct net_device *dev = idev->dev;
4982         struct ifinfomsg *hdr;
4983         struct nlmsghdr *nlh;
4984         void *protoinfo;
4985
4986         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4987         if (!nlh)
4988                 return -EMSGSIZE;
4989
4990         hdr = nlmsg_data(nlh);
4991         hdr->ifi_family = AF_INET6;
4992         hdr->__ifi_pad = 0;
4993         hdr->ifi_type = dev->type;
4994         hdr->ifi_index = dev->ifindex;
4995         hdr->ifi_flags = dev_get_flags(dev);
4996         hdr->ifi_change = 0;
4997
4998         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4999             (dev->addr_len &&
5000              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5001             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5002             (dev->ifindex != dev_get_iflink(dev) &&
5003              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5004             nla_put_u8(skb, IFLA_OPERSTATE,
5005                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5006                 goto nla_put_failure;
5007         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5008         if (!protoinfo)
5009                 goto nla_put_failure;
5010
5011         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5012                 goto nla_put_failure;
5013
5014         nla_nest_end(skb, protoinfo);
5015         nlmsg_end(skb, nlh);
5016         return 0;
5017
5018 nla_put_failure:
5019         nlmsg_cancel(skb, nlh);
5020         return -EMSGSIZE;
5021 }
5022
5023 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5024 {
5025         struct net *net = sock_net(skb->sk);
5026         int h, s_h;
5027         int idx = 0, s_idx;
5028         struct net_device *dev;
5029         struct inet6_dev *idev;
5030         struct hlist_head *head;
5031
5032         s_h = cb->args[0];
5033         s_idx = cb->args[1];
5034
5035         rcu_read_lock();
5036         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5037                 idx = 0;
5038                 head = &net->dev_index_head[h];
5039                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5040                         if (idx < s_idx)
5041                                 goto cont;
5042                         idev = __in6_dev_get(dev);
5043                         if (!idev)
5044                                 goto cont;
5045                         if (inet6_fill_ifinfo(skb, idev,
5046                                               NETLINK_CB(cb->skb).portid,
5047                                               cb->nlh->nlmsg_seq,
5048                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5049                                 goto out;
5050 cont:
5051                         idx++;
5052                 }
5053         }
5054 out:
5055         rcu_read_unlock();
5056         cb->args[1] = idx;
5057         cb->args[0] = h;
5058
5059         return skb->len;
5060 }
5061
5062 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5063 {
5064         struct sk_buff *skb;
5065         struct net *net = dev_net(idev->dev);
5066         int err = -ENOBUFS;
5067
5068         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5069         if (!skb)
5070                 goto errout;
5071
5072         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5073         if (err < 0) {
5074                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5075                 WARN_ON(err == -EMSGSIZE);
5076                 kfree_skb(skb);
5077                 goto errout;
5078         }
5079         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5080         return;
5081 errout:
5082         if (err < 0)
5083                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5084 }
5085
5086 static inline size_t inet6_prefix_nlmsg_size(void)
5087 {
5088         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5089                + nla_total_size(sizeof(struct in6_addr))
5090                + nla_total_size(sizeof(struct prefix_cacheinfo));
5091 }
5092
5093 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5094                              struct prefix_info *pinfo, u32 portid, u32 seq,
5095                              int event, unsigned int flags)
5096 {
5097         struct prefixmsg *pmsg;
5098         struct nlmsghdr *nlh;
5099         struct prefix_cacheinfo ci;
5100
5101         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5102         if (!nlh)
5103                 return -EMSGSIZE;
5104
5105         pmsg = nlmsg_data(nlh);
5106         pmsg->prefix_family = AF_INET6;
5107         pmsg->prefix_pad1 = 0;
5108         pmsg->prefix_pad2 = 0;
5109         pmsg->prefix_ifindex = idev->dev->ifindex;
5110         pmsg->prefix_len = pinfo->prefix_len;
5111         pmsg->prefix_type = pinfo->type;
5112         pmsg->prefix_pad3 = 0;
5113         pmsg->prefix_flags = 0;
5114         if (pinfo->onlink)
5115                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5116         if (pinfo->autoconf)
5117                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5118
5119         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5120                 goto nla_put_failure;
5121         ci.preferred_time = ntohl(pinfo->prefered);
5122         ci.valid_time = ntohl(pinfo->valid);
5123         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5124                 goto nla_put_failure;
5125         nlmsg_end(skb, nlh);
5126         return 0;
5127
5128 nla_put_failure:
5129         nlmsg_cancel(skb, nlh);
5130         return -EMSGSIZE;
5131 }
5132
5133 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5134                          struct prefix_info *pinfo)
5135 {
5136         struct sk_buff *skb;
5137         struct net *net = dev_net(idev->dev);
5138         int err = -ENOBUFS;
5139
5140         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5141         if (!skb)
5142                 goto errout;
5143
5144         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5145         if (err < 0) {
5146                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5147                 WARN_ON(err == -EMSGSIZE);
5148                 kfree_skb(skb);
5149                 goto errout;
5150         }
5151         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5152         return;
5153 errout:
5154         if (err < 0)
5155                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5156 }
5157
5158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5159 {
5160         struct net *net = dev_net(ifp->idev->dev);
5161
5162         if (event)
5163                 ASSERT_RTNL();
5164
5165         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5166
5167         switch (event) {
5168         case RTM_NEWADDR:
5169                 /*
5170                  * If the address was optimistic
5171                  * we inserted the route at the start of
5172                  * our DAD process, so we don't need
5173                  * to do it again
5174                  */
5175                 if (!(ifp->rt->rt6i_node))
5176                         ip6_ins_rt(ifp->rt);
5177                 if (ifp->idev->cnf.forwarding)
5178                         addrconf_join_anycast(ifp);
5179                 if (!ipv6_addr_any(&ifp->peer_addr))
5180                         addrconf_prefix_route(&ifp->peer_addr, 128,
5181                                               ifp->idev->dev, 0, 0);
5182                 break;
5183         case RTM_DELADDR:
5184                 if (ifp->idev->cnf.forwarding)
5185                         addrconf_leave_anycast(ifp);
5186                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5187                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5188                         struct rt6_info *rt;
5189
5190                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5191                                                        ifp->idev->dev, 0, 0);
5192                         if (rt)
5193                                 ip6_del_rt(rt);
5194                 }
5195                 dst_hold(&ifp->rt->dst);
5196
5197                 ip6_del_rt(ifp->rt);
5198
5199                 rt_genid_bump_ipv6(net);
5200                 break;
5201         }
5202         atomic_inc(&net->ipv6.dev_addr_genid);
5203 }
5204
5205 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5206 {
5207         rcu_read_lock_bh();
5208         if (likely(ifp->idev->dead == 0))
5209                 __ipv6_ifa_notify(event, ifp);
5210         rcu_read_unlock_bh();
5211 }
5212
5213 #ifdef CONFIG_SYSCTL
5214
5215 static
5216 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5217                            void __user *buffer, size_t *lenp, loff_t *ppos)
5218 {
5219         int *valp = ctl->data;
5220         int val = *valp;
5221         loff_t pos = *ppos;
5222         struct ctl_table lctl;
5223         int ret;
5224
5225         /*
5226          * ctl->data points to idev->cnf.forwarding, we should
5227          * not modify it until we get the rtnl lock.
5228          */
5229         lctl = *ctl;
5230         lctl.data = &val;
5231
5232         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5233
5234         if (write)
5235                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5236         if (ret)
5237                 *ppos = pos;
5238         return ret;
5239 }
5240
5241 static
5242 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5243                         void __user *buffer, size_t *lenp, loff_t *ppos)
5244 {
5245         struct inet6_dev *idev = ctl->extra1;
5246         int min_mtu = IPV6_MIN_MTU;
5247         struct ctl_table lctl;
5248
5249         lctl = *ctl;
5250         lctl.extra1 = &min_mtu;
5251         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5252
5253         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5254 }
5255
5256 static void dev_disable_change(struct inet6_dev *idev)
5257 {
5258         struct netdev_notifier_info info;
5259
5260         if (!idev || !idev->dev)
5261                 return;
5262
5263         netdev_notifier_info_init(&info, idev->dev);
5264         if (idev->cnf.disable_ipv6)
5265                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5266         else
5267                 addrconf_notify(NULL, NETDEV_UP, &info);
5268 }
5269
5270 static void addrconf_disable_change(struct net *net, __s32 newf)
5271 {
5272         struct net_device *dev;
5273         struct inet6_dev *idev;
5274
5275         rcu_read_lock();
5276         for_each_netdev_rcu(net, dev) {
5277                 idev = __in6_dev_get(dev);
5278                 if (idev) {
5279                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5280                         idev->cnf.disable_ipv6 = newf;
5281                         if (changed)
5282                                 dev_disable_change(idev);
5283                 }
5284         }
5285         rcu_read_unlock();
5286 }
5287
5288 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5289 {
5290         struct net *net;
5291         int old;
5292
5293         if (!rtnl_trylock())
5294                 return restart_syscall();
5295
5296         net = (struct net *)table->extra2;
5297         old = *p;
5298         *p = newf;
5299
5300         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5301                 rtnl_unlock();
5302                 return 0;
5303         }
5304
5305         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5306                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5307                 addrconf_disable_change(net, newf);
5308         } else if ((!newf) ^ (!old))
5309                 dev_disable_change((struct inet6_dev *)table->extra1);
5310
5311         rtnl_unlock();
5312         return 0;
5313 }
5314
5315 static
5316 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5317                             void __user *buffer, size_t *lenp, loff_t *ppos)
5318 {
5319         int *valp = ctl->data;
5320         int val = *valp;
5321         loff_t pos = *ppos;
5322         struct ctl_table lctl;
5323         int ret;
5324
5325         /*
5326          * ctl->data points to idev->cnf.disable_ipv6, we should
5327          * not modify it until we get the rtnl lock.
5328          */
5329         lctl = *ctl;
5330         lctl.data = &val;
5331
5332         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5333
5334         if (write)
5335                 ret = addrconf_disable_ipv6(ctl, valp, val);
5336         if (ret)
5337                 *ppos = pos;
5338         return ret;
5339 }
5340
5341 static
5342 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5343                               void __user *buffer, size_t *lenp, loff_t *ppos)
5344 {
5345         int *valp = ctl->data;
5346         int ret;
5347         int old, new;
5348
5349         old = *valp;
5350         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5351         new = *valp;
5352
5353         if (write && old != new) {
5354                 struct net *net = ctl->extra2;
5355
5356                 if (!rtnl_trylock())
5357                         return restart_syscall();
5358
5359                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5360                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5361                                                      NETCONFA_IFINDEX_DEFAULT,
5362                                                      net->ipv6.devconf_dflt);
5363                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5364                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5365                                                      NETCONFA_IFINDEX_ALL,
5366                                                      net->ipv6.devconf_all);
5367                 else {
5368                         struct inet6_dev *idev = ctl->extra1;
5369
5370                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5371                                                      idev->dev->ifindex,
5372                                                      &idev->cnf);
5373                 }
5374                 rtnl_unlock();
5375         }
5376
5377         return ret;
5378 }
5379
5380 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5381                                          void __user *buffer, size_t *lenp,
5382                                          loff_t *ppos)
5383 {
5384         int err;
5385         struct in6_addr addr;
5386         char str[IPV6_MAX_STRLEN];
5387         struct ctl_table lctl = *ctl;
5388         struct net *net = ctl->extra2;
5389         struct ipv6_stable_secret *secret = ctl->data;
5390
5391         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5392                 return -EIO;
5393
5394         lctl.maxlen = IPV6_MAX_STRLEN;
5395         lctl.data = str;
5396
5397         if (!rtnl_trylock())
5398                 return restart_syscall();
5399
5400         if (!write && !secret->initialized) {
5401                 err = -EIO;
5402                 goto out;
5403         }
5404
5405         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5406         if (err >= sizeof(str)) {
5407                 err = -EIO;
5408                 goto out;
5409         }
5410
5411         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5412         if (err || !write)
5413                 goto out;
5414
5415         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5416                 err = -EIO;
5417                 goto out;
5418         }
5419
5420         secret->initialized = true;
5421         secret->secret = addr;
5422
5423         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5424                 struct net_device *dev;
5425
5426                 for_each_netdev(net, dev) {
5427                         struct inet6_dev *idev = __in6_dev_get(dev);
5428
5429                         if (idev) {
5430                                 idev->addr_gen_mode =
5431                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5432                         }
5433                 }
5434         } else {
5435                 struct inet6_dev *idev = ctl->extra1;
5436
5437                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5438         }
5439
5440 out:
5441         rtnl_unlock();
5442
5443         return err;
5444 }
5445
5446 static
5447 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5448                                                 int write,
5449                                                 void __user *buffer,
5450                                                 size_t *lenp,
5451                                                 loff_t *ppos)
5452 {
5453         int *valp = ctl->data;
5454         int val = *valp;
5455         loff_t pos = *ppos;
5456         struct ctl_table lctl;
5457         int ret;
5458
5459         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5460          * we should not modify it until we get the rtnl lock.
5461          */
5462         lctl = *ctl;
5463         lctl.data = &val;
5464
5465         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5466
5467         if (write)
5468                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5469         if (ret)
5470                 *ppos = pos;
5471         return ret;
5472 }
5473
5474 static struct addrconf_sysctl_table
5475 {
5476         struct ctl_table_header *sysctl_header;
5477         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5478 } addrconf_sysctl __read_mostly = {
5479         .sysctl_header = NULL,
5480         .addrconf_vars = {
5481                 {
5482                         .procname       = "forwarding",
5483                         .data           = &ipv6_devconf.forwarding,
5484                         .maxlen         = sizeof(int),
5485                         .mode           = 0644,
5486                         .proc_handler   = addrconf_sysctl_forward,
5487                 },
5488                 {
5489                         .procname       = "hop_limit",
5490                         .data           = &ipv6_devconf.hop_limit,
5491                         .maxlen         = sizeof(int),
5492                         .mode           = 0644,
5493                         .proc_handler   = proc_dointvec,
5494                 },
5495                 {
5496                         .procname       = "mtu",
5497                         .data           = &ipv6_devconf.mtu6,
5498                         .maxlen         = sizeof(int),
5499                         .mode           = 0644,
5500                         .proc_handler   = addrconf_sysctl_mtu,
5501                 },
5502                 {
5503                         .procname       = "accept_ra",
5504                         .data           = &ipv6_devconf.accept_ra,
5505                         .maxlen         = sizeof(int),
5506                         .mode           = 0644,
5507                         .proc_handler   = proc_dointvec,
5508                 },
5509                 {
5510                         .procname       = "accept_redirects",
5511                         .data           = &ipv6_devconf.accept_redirects,
5512                         .maxlen         = sizeof(int),
5513                         .mode           = 0644,
5514                         .proc_handler   = proc_dointvec,
5515                 },
5516                 {
5517                         .procname       = "autoconf",
5518                         .data           = &ipv6_devconf.autoconf,
5519                         .maxlen         = sizeof(int),
5520                         .mode           = 0644,
5521                         .proc_handler   = proc_dointvec,
5522                 },
5523                 {
5524                         .procname       = "dad_transmits",
5525                         .data           = &ipv6_devconf.dad_transmits,
5526                         .maxlen         = sizeof(int),
5527                         .mode           = 0644,
5528                         .proc_handler   = proc_dointvec,
5529                 },
5530                 {
5531                         .procname       = "router_solicitations",
5532                         .data           = &ipv6_devconf.rtr_solicits,
5533                         .maxlen         = sizeof(int),
5534                         .mode           = 0644,
5535                         .proc_handler   = proc_dointvec,
5536                 },
5537                 {
5538                         .procname       = "router_solicitation_interval",
5539                         .data           = &ipv6_devconf.rtr_solicit_interval,
5540                         .maxlen         = sizeof(int),
5541                         .mode           = 0644,
5542                         .proc_handler   = proc_dointvec_jiffies,
5543                 },
5544                 {
5545                         .procname       = "router_solicitation_delay",
5546                         .data           = &ipv6_devconf.rtr_solicit_delay,
5547                         .maxlen         = sizeof(int),
5548                         .mode           = 0644,
5549                         .proc_handler   = proc_dointvec_jiffies,
5550                 },
5551                 {
5552                         .procname       = "force_mld_version",
5553                         .data           = &ipv6_devconf.force_mld_version,
5554                         .maxlen         = sizeof(int),
5555                         .mode           = 0644,
5556                         .proc_handler   = proc_dointvec,
5557                 },
5558                 {
5559                         .procname       = "mldv1_unsolicited_report_interval",
5560                         .data           =
5561                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
5562                         .maxlen         = sizeof(int),
5563                         .mode           = 0644,
5564                         .proc_handler   = proc_dointvec_ms_jiffies,
5565                 },
5566                 {
5567                         .procname       = "mldv2_unsolicited_report_interval",
5568                         .data           =
5569                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
5570                         .maxlen         = sizeof(int),
5571                         .mode           = 0644,
5572                         .proc_handler   = proc_dointvec_ms_jiffies,
5573                 },
5574                 {
5575                         .procname       = "use_tempaddr",
5576                         .data           = &ipv6_devconf.use_tempaddr,
5577                         .maxlen         = sizeof(int),
5578                         .mode           = 0644,
5579                         .proc_handler   = proc_dointvec,
5580                 },
5581                 {
5582                         .procname       = "temp_valid_lft",
5583                         .data           = &ipv6_devconf.temp_valid_lft,
5584                         .maxlen         = sizeof(int),
5585                         .mode           = 0644,
5586                         .proc_handler   = proc_dointvec,
5587                 },
5588                 {
5589                         .procname       = "temp_prefered_lft",
5590                         .data           = &ipv6_devconf.temp_prefered_lft,
5591                         .maxlen         = sizeof(int),
5592                         .mode           = 0644,
5593                         .proc_handler   = proc_dointvec,
5594                 },
5595                 {
5596                         .procname       = "regen_max_retry",
5597                         .data           = &ipv6_devconf.regen_max_retry,
5598                         .maxlen         = sizeof(int),
5599                         .mode           = 0644,
5600                         .proc_handler   = proc_dointvec,
5601                 },
5602                 {
5603                         .procname       = "max_desync_factor",
5604                         .data           = &ipv6_devconf.max_desync_factor,
5605                         .maxlen         = sizeof(int),
5606                         .mode           = 0644,
5607                         .proc_handler   = proc_dointvec,
5608                 },
5609                 {
5610                         .procname       = "max_addresses",
5611                         .data           = &ipv6_devconf.max_addresses,
5612                         .maxlen         = sizeof(int),
5613                         .mode           = 0644,
5614                         .proc_handler   = proc_dointvec,
5615                 },
5616                 {
5617                         .procname       = "accept_ra_defrtr",
5618                         .data           = &ipv6_devconf.accept_ra_defrtr,
5619                         .maxlen         = sizeof(int),
5620                         .mode           = 0644,
5621                         .proc_handler   = proc_dointvec,
5622                 },
5623                 {
5624                         .procname       = "accept_ra_min_hop_limit",
5625                         .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5626                         .maxlen         = sizeof(int),
5627                         .mode           = 0644,
5628                         .proc_handler   = proc_dointvec,
5629                 },
5630                 {
5631                         .procname       = "accept_ra_pinfo",
5632                         .data           = &ipv6_devconf.accept_ra_pinfo,
5633                         .maxlen         = sizeof(int),
5634                         .mode           = 0644,
5635                         .proc_handler   = proc_dointvec,
5636                 },
5637 #ifdef CONFIG_IPV6_ROUTER_PREF
5638                 {
5639                         .procname       = "accept_ra_rtr_pref",
5640                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
5641                         .maxlen         = sizeof(int),
5642                         .mode           = 0644,
5643                         .proc_handler   = proc_dointvec,
5644                 },
5645                 {
5646                         .procname       = "router_probe_interval",
5647                         .data           = &ipv6_devconf.rtr_probe_interval,
5648                         .maxlen         = sizeof(int),
5649                         .mode           = 0644,
5650                         .proc_handler   = proc_dointvec_jiffies,
5651                 },
5652 #ifdef CONFIG_IPV6_ROUTE_INFO
5653                 {
5654                         .procname       = "accept_ra_rt_info_max_plen",
5655                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5656                         .maxlen         = sizeof(int),
5657                         .mode           = 0644,
5658                         .proc_handler   = proc_dointvec,
5659                 },
5660 #endif
5661 #endif
5662                 {
5663                         .procname       = "accept_ra_rt_table",
5664                         .data           = &ipv6_devconf.accept_ra_rt_table,
5665                         .maxlen         = sizeof(int),
5666                         .mode           = 0644,
5667                         .proc_handler   = proc_dointvec,
5668                 },
5669                 {
5670                         .procname       = "proxy_ndp",
5671                         .data           = &ipv6_devconf.proxy_ndp,
5672                         .maxlen         = sizeof(int),
5673                         .mode           = 0644,
5674                         .proc_handler   = addrconf_sysctl_proxy_ndp,
5675                 },
5676                 {
5677                         .procname       = "accept_source_route",
5678                         .data           = &ipv6_devconf.accept_source_route,
5679                         .maxlen         = sizeof(int),
5680                         .mode           = 0644,
5681                         .proc_handler   = proc_dointvec,
5682                 },
5683 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5684                 {
5685                         .procname       = "optimistic_dad",
5686                         .data           = &ipv6_devconf.optimistic_dad,
5687                         .maxlen         = sizeof(int),
5688                         .mode           = 0644,
5689                         .proc_handler   = proc_dointvec,
5690
5691                 },
5692                 {
5693                         .procname       = "use_optimistic",
5694                         .data           = &ipv6_devconf.use_optimistic,
5695                         .maxlen         = sizeof(int),
5696                         .mode           = 0644,
5697                         .proc_handler   = proc_dointvec,
5698
5699                 },
5700 #endif
5701 #ifdef CONFIG_IPV6_MROUTE
5702                 {
5703                         .procname       = "mc_forwarding",
5704                         .data           = &ipv6_devconf.mc_forwarding,
5705                         .maxlen         = sizeof(int),
5706                         .mode           = 0444,
5707                         .proc_handler   = proc_dointvec,
5708                 },
5709 #endif
5710                 {
5711                         .procname       = "disable_ipv6",
5712                         .data           = &ipv6_devconf.disable_ipv6,
5713                         .maxlen         = sizeof(int),
5714                         .mode           = 0644,
5715                         .proc_handler   = addrconf_sysctl_disable,
5716                 },
5717                 {
5718                         .procname       = "accept_dad",
5719                         .data           = &ipv6_devconf.accept_dad,
5720                         .maxlen         = sizeof(int),
5721                         .mode           = 0644,
5722                         .proc_handler   = proc_dointvec,
5723                 },
5724                 {
5725                         .procname       = "force_tllao",
5726                         .data           = &ipv6_devconf.force_tllao,
5727                         .maxlen         = sizeof(int),
5728                         .mode           = 0644,
5729                         .proc_handler   = proc_dointvec
5730                 },
5731                 {
5732                         .procname       = "ndisc_notify",
5733                         .data           = &ipv6_devconf.ndisc_notify,
5734                         .maxlen         = sizeof(int),
5735                         .mode           = 0644,
5736                         .proc_handler   = proc_dointvec
5737                 },
5738                 {
5739                         .procname       = "suppress_frag_ndisc",
5740                         .data           = &ipv6_devconf.suppress_frag_ndisc,
5741                         .maxlen         = sizeof(int),
5742                         .mode           = 0644,
5743                         .proc_handler   = proc_dointvec
5744                 },
5745                 {
5746                         .procname       = "accept_ra_from_local",
5747                         .data           = &ipv6_devconf.accept_ra_from_local,
5748                         .maxlen         = sizeof(int),
5749                         .mode           = 0644,
5750                         .proc_handler   = proc_dointvec,
5751                 },
5752                 {
5753                         .procname       = "accept_ra_mtu",
5754                         .data           = &ipv6_devconf.accept_ra_mtu,
5755                         .maxlen         = sizeof(int),
5756                         .mode           = 0644,
5757                         .proc_handler   = proc_dointvec,
5758                 },
5759                 {
5760                         .procname       = "stable_secret",
5761                         .data           = &ipv6_devconf.stable_secret,
5762                         .maxlen         = IPV6_MAX_STRLEN,
5763                         .mode           = 0600,
5764                         .proc_handler   = addrconf_sysctl_stable_secret,
5765                 },
5766                 {
5767                         .procname       = "use_oif_addrs_only",
5768                         .data           = &ipv6_devconf.use_oif_addrs_only,
5769                         .maxlen         = sizeof(int),
5770                         .mode           = 0644,
5771                         .proc_handler   = proc_dointvec,
5772                 },
5773                 {
5774                         .procname       = "ignore_routes_with_linkdown",
5775                         .data           = &ipv6_devconf.ignore_routes_with_linkdown,
5776                         .maxlen         = sizeof(int),
5777                         .mode           = 0644,
5778                         .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
5779                 },
5780                 {
5781                         /* sentinel */
5782                 }
5783         },
5784 };
5785
5786 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5787                 struct inet6_dev *idev, struct ipv6_devconf *p)
5788 {
5789         int i;
5790         struct addrconf_sysctl_table *t;
5791         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5792
5793         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5794         if (!t)
5795                 goto out;
5796
5797         for (i = 0; t->addrconf_vars[i].data; i++) {
5798                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5799                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5800                 t->addrconf_vars[i].extra2 = net;
5801         }
5802
5803         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5804
5805         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5806         if (!t->sysctl_header)
5807                 goto free;
5808
5809         p->sysctl = t;
5810         return 0;
5811
5812 free:
5813         kfree(t);
5814 out:
5815         return -ENOBUFS;
5816 }
5817
5818 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5819 {
5820         struct addrconf_sysctl_table *t;
5821
5822         if (!p->sysctl)
5823                 return;
5824
5825         t = p->sysctl;
5826         p->sysctl = NULL;
5827         unregister_net_sysctl_table(t->sysctl_header);
5828         kfree(t);
5829 }
5830
5831 static int addrconf_sysctl_register(struct inet6_dev *idev)
5832 {
5833         int err;
5834
5835         if (!sysctl_dev_name_is_allowed(idev->dev->name))
5836                 return -EINVAL;
5837
5838         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5839                                     &ndisc_ifinfo_sysctl_change);
5840         if (err)
5841                 return err;
5842         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5843                                          idev, &idev->cnf);
5844         if (err)
5845                 neigh_sysctl_unregister(idev->nd_parms);
5846
5847         return err;
5848 }
5849
5850 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5851 {
5852         __addrconf_sysctl_unregister(&idev->cnf);
5853         neigh_sysctl_unregister(idev->nd_parms);
5854 }
5855
5856
5857 #endif
5858
5859 static int __net_init addrconf_init_net(struct net *net)
5860 {
5861         int err = -ENOMEM;
5862         struct ipv6_devconf *all, *dflt;
5863
5864         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5865         if (!all)
5866                 goto err_alloc_all;
5867
5868         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5869         if (!dflt)
5870                 goto err_alloc_dflt;
5871
5872         /* these will be inherited by all namespaces */
5873         dflt->autoconf = ipv6_defaults.autoconf;
5874         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5875
5876         dflt->stable_secret.initialized = false;
5877         all->stable_secret.initialized = false;
5878
5879         net->ipv6.devconf_all = all;
5880         net->ipv6.devconf_dflt = dflt;
5881
5882 #ifdef CONFIG_SYSCTL
5883         err = __addrconf_sysctl_register(net, "all", NULL, all);
5884         if (err < 0)
5885                 goto err_reg_all;
5886
5887         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5888         if (err < 0)
5889                 goto err_reg_dflt;
5890 #endif
5891         return 0;
5892
5893 #ifdef CONFIG_SYSCTL
5894 err_reg_dflt:
5895         __addrconf_sysctl_unregister(all);
5896 err_reg_all:
5897         kfree(dflt);
5898 #endif
5899 err_alloc_dflt:
5900         kfree(all);
5901 err_alloc_all:
5902         return err;
5903 }
5904
5905 static void __net_exit addrconf_exit_net(struct net *net)
5906 {
5907 #ifdef CONFIG_SYSCTL
5908         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5909         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5910 #endif
5911         kfree(net->ipv6.devconf_dflt);
5912         kfree(net->ipv6.devconf_all);
5913 }
5914
5915 static struct pernet_operations addrconf_ops = {
5916         .init = addrconf_init_net,
5917         .exit = addrconf_exit_net,
5918 };
5919
5920 static struct rtnl_af_ops inet6_ops __read_mostly = {
5921         .family           = AF_INET6,
5922         .fill_link_af     = inet6_fill_link_af,
5923         .get_link_af_size = inet6_get_link_af_size,
5924         .validate_link_af = inet6_validate_link_af,
5925         .set_link_af      = inet6_set_link_af,
5926 };
5927
5928 /*
5929  *      Init / cleanup code
5930  */
5931
5932 int __init addrconf_init(void)
5933 {
5934         struct inet6_dev *idev;
5935         int i, err;
5936
5937         err = ipv6_addr_label_init();
5938         if (err < 0) {
5939                 pr_crit("%s: cannot initialize default policy table: %d\n",
5940                         __func__, err);
5941                 goto out;
5942         }
5943
5944         err = register_pernet_subsys(&addrconf_ops);
5945         if (err < 0)
5946                 goto out_addrlabel;
5947
5948         addrconf_wq = create_workqueue("ipv6_addrconf");
5949         if (!addrconf_wq) {
5950                 err = -ENOMEM;
5951                 goto out_nowq;
5952         }
5953
5954         /* The addrconf netdev notifier requires that loopback_dev
5955          * has it's ipv6 private information allocated and setup
5956          * before it can bring up and give link-local addresses
5957          * to other devices which are up.
5958          *
5959          * Unfortunately, loopback_dev is not necessarily the first
5960          * entry in the global dev_base list of net devices.  In fact,
5961          * it is likely to be the very last entry on that list.
5962          * So this causes the notifier registry below to try and
5963          * give link-local addresses to all devices besides loopback_dev
5964          * first, then loopback_dev, which cases all the non-loopback_dev
5965          * devices to fail to get a link-local address.
5966          *
5967          * So, as a temporary fix, allocate the ipv6 structure for
5968          * loopback_dev first by hand.
5969          * Longer term, all of the dependencies ipv6 has upon the loopback
5970          * device and it being up should be removed.
5971          */
5972         rtnl_lock();
5973         idev = ipv6_add_dev(init_net.loopback_dev);
5974         rtnl_unlock();
5975         if (IS_ERR(idev)) {
5976                 err = PTR_ERR(idev);
5977                 goto errlo;
5978         }
5979
5980         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5981                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5982
5983         register_netdevice_notifier(&ipv6_dev_notf);
5984
5985         addrconf_verify();
5986
5987         rtnl_af_register(&inet6_ops);
5988
5989         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5990                               NULL);
5991         if (err < 0)
5992                 goto errout;
5993
5994         /* Only the first call to __rtnl_register can fail */
5995         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5996         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5997         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5998                         inet6_dump_ifaddr, NULL);
5999         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6000                         inet6_dump_ifmcaddr, NULL);
6001         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6002                         inet6_dump_ifacaddr, NULL);
6003         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6004                         inet6_netconf_dump_devconf, NULL);
6005
6006         ipv6_addr_label_rtnl_register();
6007
6008         return 0;
6009 errout:
6010         rtnl_af_unregister(&inet6_ops);
6011         unregister_netdevice_notifier(&ipv6_dev_notf);
6012 errlo:
6013         destroy_workqueue(addrconf_wq);
6014 out_nowq:
6015         unregister_pernet_subsys(&addrconf_ops);
6016 out_addrlabel:
6017         ipv6_addr_label_cleanup();
6018 out:
6019         return err;
6020 }
6021
6022 void addrconf_cleanup(void)
6023 {
6024         struct net_device *dev;
6025         int i;
6026
6027         unregister_netdevice_notifier(&ipv6_dev_notf);
6028         unregister_pernet_subsys(&addrconf_ops);
6029         ipv6_addr_label_cleanup();
6030
6031         rtnl_lock();
6032
6033         __rtnl_af_unregister(&inet6_ops);
6034
6035         /* clean dev list */
6036         for_each_netdev(&init_net, dev) {
6037                 if (__in6_dev_get(dev) == NULL)
6038                         continue;
6039                 addrconf_ifdown(dev, 1);
6040         }
6041         addrconf_ifdown(init_net.loopback_dev, 2);
6042
6043         /*
6044          *      Check hash table.
6045          */
6046         spin_lock_bh(&addrconf_hash_lock);
6047         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6048                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6049         spin_unlock_bh(&addrconf_hash_lock);
6050         cancel_delayed_work(&addr_chk_work);
6051         rtnl_unlock();
6052
6053         destroy_workqueue(addrconf_wq);
6054 }